The clutch is toothed. Gear couplings and other drive couplings

Flexible gear coupling with double arc teeth

INTRODUCTION
The Flexible Gear Coupling is a consistent, common goal for the production of commercial couplings that meet the high quality standards and technical and performance characteristics that characterize industrial couplings. Power transmission is a special area of ​​application for flexible couplings, which provide flexible connection of rotating elements.
In addition to transmitting torque, gear couplings can compensate for radial and angular misalignment and minimize axial slip. Thanks to their state-of-the-art design and extreme precision in machining and quality control, the couplings provide high performance (compared to other couplings in this category), making them suitable for any industrial application.

DESIGN
From a structural point of view, flexible gear couplings are made of two symmetrical steel bushings and synthetic resin sleeves, providing connection and power transmission between the two bushings.
Each of the two low-carbon steel bushes with anti-corrosion surface treatment is equipped with a ring gear.
Hollow sleeve with internal injection molded teeth made of high molecular weight semi-crystalline technopolymer.
This material, whose origin is confirmed by a certificate, meets the temperature conditions and is filled with a grease that increases the self-lubricating properties of this polymer.
Double curved teeth of both bushes, having a certain pitch, obtained on CNC machines, provide optimal performance, compensate for angular and radial axial deviations of a dynamic type, even under load.
In the case of equal torque transfer, the special tooth geometry significantly minimizes surface pressure, while increasing the wear resistance of the coupling, as well as its ability to transfer load.

The relative resistance of the polymer to ambient humidity and its ability to withstand temperatures from -20°C to +120°C with short-term peaks up to +150°C allow the coupling to ideally withstand harsh working conditions even in aggressive environments.

FEATURES AND BENEFITS
- Compact design, reduced weight and moment of inertia
- Movement at a constant speed
- Silent operation, elastic shock and vibration absorption
- Resistance to the most common chemicals and moderate heat, max. 80оС
- Self-lubricating ability, no conductivity and no need for maintenance
- Reasonable price, ease of assembly, compliance with many types of work, even in the most difficult conditions.

Off axis

Centered shafts

Radial deflection

Angular deviation

Radial and angular deviation

CLUTCH SELECTION
Selection based on torque: The coupling must be selected based on the maximum torque of the motor, which must not exceed the allowable peak torque of the coupling.

Technical details

(1) Refers to standard coupling kit with maximum bore and no keyways.
(2) By bushing

ASSEMBLY INSTRUCTIONS
a) Attach the two coupling halves to their respective shafts, making sure that they are inner sides are on the same level with the ends of the shafts.
b) Push the sleeve onto the two coupling halves, while adjusting the distance between them (distance „S“) and the axial alignment of both shafts.
c) Install the two elements to be connected in the appropriate position.
d) Before rotating the coupling, make sure that the sleeve moves freely along the axis.

Steel C.43 UNI 7847

CODE EXPLANATION EXAMPLE

SG-14-CC = with 2 short sleeves

SG-14-LC = long-short sleeve

SG-14-LL = long-long sleeve

Gathering distances

On request: Full bore according to ISO standards, H7 tolerance, keyways according to DIN 6885, JS9 tolerances. Holes for screws.

Type of	The code
Full Gear CouplingSG-CC	SGCC014 SGCC019 SGCC024 SGCC028 SGCC032 SGCC038 SGCC042 SGCC048 SGCC055 SGCC065
Full Gear CouplingSG-LC	SGLC014 SGLC019 SGLC024 SGLC028 SGLC032 SGLC038 SGLC042 SGLC048 SGLC055 SGLC065
Full Gear Coupling SG-LL	SGLL014 SGLL019 SGLL024 SGLL028 SGLL032 SGLL038 SGLL042 SGLL048 SGLL055 SGLL065
Short sleeve SG-C	SG0C014 SG0C019 SG0C024 SG0C028 SG0C032 SG0C038 SG0C042 SG0C048 SG0C055 SG0C065
Coupling long sleeve SG-L	SG0L014 SG0L019 SG0L024 SG0L028 SG0L032 SG0L038 SG0L042 SG0L048 SG0L055 SG0L065
Polyamide sleeve SG-M	SG0M014 SG0M019 SG0M024 SG0M028 SG0M032 SG0M038 SG0M042 SG0M048 SG0M055 SG0M065

gear clutch serves to transfer rotation from the engine to the working body (usually through a gearbox), while it compensates for minor angular, radial and axial displacements during torque transmission.

Gear coupling parts are made of steel by forging or casting, because these parts withstand heavy loads, operating in a wide range of speeds. The coupling consists of bushings, clips and flange half-couplings. In a gear coupling, one of the cages can be replaced by a coupling half, while a shaft is pressed directly into it (type 2).

Cog coupling bushings are produced with cylindrical (version 1) or conical (version 2) holes for short shaft ends. Tooth surfaces of gear couplings necessarily heat treated.

Gear couplings manufactured in the following types:

• Type 1 - gear couplings with a detachable cage (MZ - designation according to GOST 5006-55). These couplings are used for direct connection of shafts;
• Type 2 - gear couplings with an intermediate shaft (MZP - designation according to GOST 5006-55). Used to connect shafts using an intermediate shaft;
• Type 3 - gear couplings with one-piece cage. The field of application is similar to the couplings of the first version.

Coupling bushings are made in the following versions:

1. - with cylindrical holes for short shaft ends according to GOST 12080.
2. - with tapered holes for short shaft ends according to GOST 12081 for couplings of types 1 and 3.

It is allowed, at the request of the consumer, to produce bushings with holes for the ends of shafts of a different shape. In couplings, a combination of bushings of various designs is allowed.

Type 1 and 3 couplings connect the shafts directly, while Type 2 couplings connect the shafts through an intermediate shaft.

The misalignment of the axis of each sleeve relative to the axis of the clip is not more than 1º30".

Bushings and clips, as well as flange half-couplings, are made forged from steel grade not lower than 40 according to GOST 1050-74 and 35XM according to GOST 4543-71, or cast from steel not lower than grade 40L according to GOST 977-75.

The surface hardness of the teeth of bushings and clips is 42…51 HRC.

1 - bushing; 2 - clip1 - bushing; 2 - clip; 3 - flange half-coupling; 4 - intermediate shaft

1 - bushing; 2 - clip

Overall and connecting dimensions

Table note:

1. Rated torque is the maximum torque transmitted by the coupling during its service life in continuous operation with constant load and constant direction of rotation.
2. It is allowed, at the request of the consumer, to manufacture couplings with dimensions d smaller than those indicated in the table.
3. The outer diameter of type 3 couplings must correspond to the dimension D1, and the parameters and other dimensions - given in the table.
4. Assembly options for type 2 gear couplings with mounting holes of version 2 are allowed.
5. In gear couplings of type 2, the seat size of the flange half-couplings can be increased to any values ​​​​in accordance with GOST 12080 and GOST 12081, without entailing changes in other dimensions and parameters according to the table

Complete set of gear couplings

Parameters of gear connection of gear couplings

Couplings gear and any others - quickly and conveniently for the Client!

The company "Promek" has a vast experience in the supply of gear couplings and couplings of other types for various purposes. Our dealer agreements allow us to supply drive couplings at manufacturer's prices, and over the years, proven logistics schemes make our deliveries convenient for our Clients.

Call our managers, set a task - and your application for the couplings necessary for the operation of your equipment will be processed quickly and efficiently.

NPO PromEK supplies:

• safety clutches
• elastic couplings
• cam-disc clutches
• single-row chain couplings
• articulated couplings
• overrunning clutches
• cam clutches
• drive couplings
• couplings
• end couplings
• electromagnetic clutches
• rigid compensating and movable couplings
• couplings for pumps
• couplings for compressors
• couplings for conveyors
• steel lamellar couplings
• highly elastic couplings
• gear couplings with circular teeth
• KTR couplings
• special couplings
• Couplings UKM-12- for placing switching products and protecting them from atmospheric precipitation
• Couplings UPM-24- for cutting cables and connecting them to track circuits
• Couplings RM4-28; RM-28; PM7-49; RM8-112- cable end, cable branching couplings

Delivery to the transport company will be free for you. Delivery in Russia and the CIS will be carried out in the most rational way!

Couplings as connecting devices for shafts

Couplings, connecting devices for shafts, the ends of which are closed or removed at a short distance, ensure the transmission of torque from one shaft to another. As a rule, the geometric axis of one shaft is a continuation of the geometric axis of the other shaft. With the help of couplings, rotation is also transmitted to gears, pulleys, loosely mounted on shafts.

Couplings are not endowed with the function to change the torque and direction of rotation. Some types absorb vibrations, protecting the machine from overload.

In mechanical engineering, couplings of various designs are used very widely. Modern machines are by no means monolithic and consist of separate parts with input and output ends of the shafts, which connected with couplings for various purposes:

• to obtain long shafts from separate parts and compensate for small mounting inaccuracies in the relative position of the connected shafts;
• to give the shafts some mobility during operation;
• to turn individual nodes on and off;
• for the purpose of automatic connection and disconnection of shafts - the performance of automatic control functions;
• to reduce dynamic loads on mechanisms.

If the simplest coupling is made from a piece of a nipple tube and connects the shaft of an electric motor to the impeller of an automobile glass washer, then, for example, jet engine turbocharger couplings consist of hundreds of parts and are the most complex self-regulating systems. The variety of functions predetermines the variety of coupling designs, and as a result, their branched classification.

Couplings and their classification

By the nature of the connection of the shafts, the couplings form several groups.

• Mechanical couplings:

- hard (deaf). Practically do not allow radial, axial and angular displacements of the shafts;

- compensating. They allow some radial, axial and angular displacements of the shafts, which are compensated by elastic elements - rubber bushings, springs, etc.;

- friction. They allow short-term slippage of the shafts during overloads.

• Couplings of hydraulic or pneumatic action.

Classes of couplings according to the mode of shaft connection

• Non-releaseable (permanent, connecting). Shafts are connected constantly, forming single long shafts. In turn, they are divided into:

- Rigid(one-piece, split in a plane parallel to the shaft and split in a plane perpendicular to the shaft);

- Compensating self-aligning(axial, radial, angular, universal);

- elastic(linear, non-linear).

• Managed (coupled). Shafts are connected and disconnected during operation. They are divided into synchronous and asynchronous (friction) - with mechanical, electrical, hydraulic, pneumatic switching.
• Self-acting (self-managed, automatic). Work automatically at the set operating mode. Are divided into:

- Centrifugal(friction);

- Volumetric(ratchet, friction);

- Safety. The shafts are separated in case of violation of normal operating conditions (with a destructible element, with an indestructible element).

• Others.

According to the ability to reduce dynamic loads, couplings are divided into:

• hard - not smoothing vibrations, shocks and shocks;
• elastic - smoothing vibrations, shocks and shocks due to the presence of elastic elements in their composition.

Most of the couplings used, which are autonomous units, are standardized: the main characteristic in their selection is the transmitted torque.

The coupling, designed to transmit a certain torque, is made in several modifications for different shaft diameters.

Couplings and their designs

Rigid (deaf) couplings can be sleeved or flanged.

Sleeve coupling, the simplest of rigid couplings, is a sleeve fitted to the output ends of the shafts with the help of keys, pins or splines. It is used in low-speed and non-critical machine designs with shaft diameters up to 70 mm. Made from steel 45; couplings of large sizes - from SCH25 cast iron.

flange coupling consists of two coupling halves connected by bolts. To transmit torque, keyed or splined connections are used. Torque is transmitted by frictional forces between the flanges and the bolts themselves when they are inserted without clearance. Flange couplings are standardized in the diameter range of 12...250 mm and transmit torques of 8...45000 Nm. In heavy machines, the coupling halves are welded to the shafts.

These couplings are sometimes called transversely rolled. The alignment of the flanges is carried out by means of a circular protrusion on one coupling half, and grooves of the same diameter are made on the other, or by means of a centering ring. They are used for shafts with a diameter of up to 350 mm. Material for flange half-couplings - steel 40, 35L, SCHZO cast iron (for large size couplings).

The most used of this group of couplings consists of two half-couplings with external teeth and a detachable cage with two rows of internal teeth of an involute profile. The gear coupling compensates for radial, axial and angular displacements of the shafts due to lateral gaps in the engagement and turning of the teeth in a sphere, the misalignment of the shafts is compensated by the sliding of the teeth. To increase wear resistance, the teeth are subjected to heat treatment, and lubricant is poured into the coupling. The material of half-couplings and clips is steel 40 or 45L.

Cam-disc clutch consists of two coupling halves with diametrical grooves at the ends and an intermediate floating disk with mutually perpendicular ledges. Friction surfaces are periodically lubricated with grease. The cam-disc clutch is used to connect low-speed shafts (up to 250 rpm). Couplings and disks are made of steel 45L.

It is similar in design to a flange coupling, but instead of connecting bolts, flexible coupling there are steel fingers on which elastic (rubber, leather, etc.) bushings are installed. Elastic elements make it possible to compensate for minor axial displacements of the shafts. Especially widely used for connecting electric motors with actuators with a shaft diameter of up to 150 mm. Coupling half material - steel 35, 35L or SCH25 cast iron; fingers are made of steel 45.

A prominent representative of the family of movable couplings is articulated coupling. The idea of ​​a clutch, first proposed by Girolamo Cardano in 1570, was brought to an engineering solution in 1770 by Robert Hooke. Therefore they are called both cardan couplings and Hooke's joints. Articulated couplings connect shafts at an angle of up to 45 degrees and allow you to create chain shafts with rotation transfer to inaccessible places. This is possible due to the fact that the cross is not one hinge, but two with perpendicular axes.

Flexible couplings designed primarily to dampen shocks, shocks and vibrations, as well as some compensation for shaft misalignment. Their main feature is the presence of a metallic or non-metallic elastic element: these are stars, washers, elastic shells, helical and serpentine springs, bellows, etc.

Couplings designed to connect and disconnect shafts. Some types of clutches allow this to be done without stopping the electric motor. Clutches are sometimes called manageable. According to the principle of operation, cam and friction clutches are distinguished.

Cam clutches consist of two coupling halves with cams on the end surfaces. The coupling is switched on by means of a coupling half, which can move along the shaft along the guide key or along the splines.

Friction clutches allow smooth clutching at any speed, which is successfully used, for example, in the design of automobile clutches. By design, they are divided into the most common disk - friction occurs on the end surfaces of the disks - conical and cylindrical.

Friction clutches operate as without lubricant ( dry couplings), and with lubricant ( oil couplings). The lubrication system reduces the wear of working surfaces, but complicates the design of the coupling. The material for friction clutches is structural steel, SCh30 cast iron. Friction materials: pressed ferrodo asbestos-wire fabric, friction plastic, powder materials, etc. - are used in the form of overlays.

Self-guided clutches designed for automatic separation of the shafts depending on the change of one of the following parameters: torque - safety clutches, directions of rotation - overrunning, and rotation speeds - centrifugal.

Safety clutches have the function of limiting the transmitted torque, which protects the machine from damage during overloads. The most widespread are safety cam, ball and friction clutches. For the manufacture of safety clutch parts, depending on the type of clutch, structural steels, SCHZO cast iron, friction materials, ShKh12 steel, etc. are used. Pins for couplings with a collapsing element are made of steel 45, bushings are made of steel 40X with hardening.

Call our managers, set a task - and your application for gear couplings and other drive couplings will be processed quickly and efficiently.

Coupling Design Analysis

The following designs of couplings are often found in the metallurgical industry.

1. flange coupling is the most reliable and widespread type of rigid couplings. It consists of two coupling halves with flanges mounted on the ends of the shafts, the flanges are tightened with bolts.
   To ensure alignment, the coupling halves are centered either with a protrusion on one flange and a recess on the other, or with intermediate half rings. For greater mating accuracy and prevention of shaft bending in couplings, strict perpendicularity of the end surfaces of the coupling halves to the shaft axis must be ensured. Material - steel 40 and 35L.
   Coupling halves are alternately connected by semi-clean bolts inserted into the hole with a gap, and clean bolts inserted into the hole without a gap.
2. gear couplings - the most common type of rigid compensating couplings, used to connect horizontal coaxial shafts and are able to compensate for displacements of the shaft axes.
   General purpose gear coupling consists of two coupling halves with internal teeth and two bushings with external teeth.
   Toothed bushings are made with a straight or elliptical generatrix. Compensation for shaft displacements is achieved by misalignment of the bushings relative to the cages due to side clearances and the spherical surface of the outer teeth.
3. Cam-disc clutches– designed to connect shafts with significant radial misalignments, allow minor angular and axial misalignments. The coupling consists of two half-couplings and an intermediate disk with cams located crosswise and entering the corresponding grooves on the half-couplings. The transmission of torque is carried out by the cams of the disk, which, with displaced shafts, slide along the side surface of the grooves. The center of the disk during the rotation of the shafts describes a circle in space.
   The conjugation of the cams and grooves is taken by fit with a gap. The presence of gaps in this interface impairs the operation of the coupling due to an increase in edge pressures on the contact surface.
   Flaws: unsatisfactory work even with small distortions; significant wear of working surfaces; the presence of centrifugal force acting on the disk; friction losses and the need for lubrication, reduced reliability. Dignity: the ability to compensate for significant radial displacements of the shaft axes.
4. Articulated Couplings use the principle of operation of Hooke's spatial hinge, serve to transmit torque between shafts with a large angular displacement of the axes, which can change during the rotation of the coupling.
   Typically, the coupling consists of two forks and an intermediate part in the form of a cross, pivotally connected to the ends of the forks. By connecting two couplings, it is possible to ensure the transmission of torque with a significant radial displacement of the shaft axes.
   Articulated couplings are used: to compensate for inaccuracies in the relative position of the shafts that occur during assembly; transmission of rotation to the shafts, the position of which changes during operation.
   In the presence of an angular displacement of the axes of the connected shafts, the rotation of the driven shaft of a single articulated coupling occurs unevenly with uniform rotation of the drive shaft. The periodic lagging and advancing of the driven shaft relative to the nominal positions corresponding to uniform rotation causes dynamic loads.
5. Couplings with serpentine springs. The coupling halves are connected by an elastic element made in the form of a serpentine spring located on a cylindrical surface. The clutch consists of half-couplings with teeth, between which 6-8 sections of serpentine springs are placed. To protect the spring from falling out and retaining the lubricant (usually plastic), there is a casing consisting of two halves, tightened with screws.
   The spring is the most critical part of the clutch. It is made of spring steel with tensile strength σ t= 170 MPa. In heavy couplings, the springs are installed in two or three rows. Such couplings are characterized by high reliability in operation and small overall dimensions. These properties have led to their widespread use in heavy engineering (rolling mills, steam turbines), despite the complexity of the design, low technology and the need for control in operation.
6. Couplings with a toroidal elastic element. The elastic element of the coupling is a rubber or rubber-cord sheath. The rubber-cord sheath is more difficult to manufacture than the rubber one, but its service life is several times longer than the rubber one. These couplings are characterized by high compensation properties, the ability to reduce dynamic loads due to low torsional stiffness and high damping capacity. The disadvantages of couplings include their large diameter and the appearance axial loads on the shaft supports caused by centrifugal forces acting on the elastic element.
   In a coupling with a toroidal shell, the coupling halves are connected by an elastic element in the form of a toroidal shell made of rubber or reinforced rubber. The pressure ring consists of half rings, screwed to the ring. Using screws, the side of the elastic element is clamped between the coupling half flange and the pressure ring, creating friction forces between rubber and metal. The width of the ring is chosen so that when the metal parts come into contact, as a result of tightening the screws, the rubber is compressed by a given amount. The design allows the replacement of the elastic element without axial displacement of the coupling halves.
   The coupling is characterized by increased ability to work reliably with significant mutual displacements of the connected shafts. The greater these displacements, the shorter the service life of the elastic element, since with the radial and angular displacement of the shafts, cyclic stresses arise in the rubber, causing it to heat up and reduce strength.
7. Sleeve-pin coupling consists of two coupling halves connected by bolts - fingers with rings made of elastic material (rubber, leather) put on them. The coupling half also serves as a brake pulley. In the coupling half flange, pins are reinforced with tapered shanks, on which elastic rubber bushings are put on. The elastic bushings enter the holes located in the coupling half flange.
8. Couplings with metal discs structurally very simple and do not require special care during operation ().

   Figure 6.2 - Coupling with metal discs: 1 - right half-coupling; 2 - nut; 3 - left coupling half; 4 - disks; 5 - bolt

   The coupling consists of two identical coupling halves 1 and 3 and a set of plate discs 4. Bolts 5 and nuts 6 discs 4 are attracted to the coupling half 1, and bolts 7 and nuts 8 - to the connecting insert 2.
   Couplings are used in reversing drives and mechanisms with remote control, which require exact repetition of a given program by the actuating element. Couplings are able to work with significant angular and axial displacements. The radial stiffness of such couplings is commensurate with the rigidity of the shafts, therefore, in the presence of radial displacements, double couplings are used. Double couplings are used in cases where it is necessary to compensate for significant axial displacements and reduce the axial stiffness of the coupling. These couplings do not require lubrication, allow increased misalignment of the articulated shafts in transient conditions, and also have high compensating, vibration isolating and damping properties.
   The parting planes of the coupling halves must be strictly perpendicular to the axes of the shafts. Coupling halves are fixed on the shafts with the help of keys (on a conical shaft - with an axial nut); fixation of the coupling halves in the axial direction is carried out by end fastening or set screws.

Care and supervision of couplings

When accepting replacements, the couplings are inspected in cases where instructions are given in the rules for the technical operation of certain types of equipment. During inspections it is necessary:

• check whether the fit of the coupling halves on the shafts has been disturbed;
• check (by tapping) the reliability of the tightening of the bolt fasteners in the place of the coupler separation;
• inspect the condition and fastening of the coupling covers.

At least once every 10-15 days, the presence of oil in gear couplings is checked and topped up to the control level. To check the amount of oil in the clutch, it is recommended to fill the clutch with a measured amount of lubricant, turn it so that oil appears at the filler hole (). This position must be marked with a punch at the top of the flange in order to later know the position of the coupling for oil filling. It is not allowed to operate gear couplings, in which, due to wear of the seals, splashing (leakage) of the lubricant occurs during operation. Coupling teeth with serpentine springs are lubricated at least once every 15 days.

Figure 6.3 - Scheme for checking the oil level in the gear coupling

Revisions and repair of couplings

Couplings should be inspected during scheduled shutdowns of equipment for repairs within the following periods:

• transversely rolled, longitudinally rolled, sleeve-finger and serrated - at least once every 45 days;
• compensating couplings with an intermediate disk - at least once a month;
• Couplings with a serpentine spring (Bibbi) - at least once every 15 days.

Before disassembling the couplings, it is necessary to check the marking or carry out punching: gear couplings on both coupling halves and on the side surfaces of the sleeve and coupling half; couplings with a serpentine spring on the teeth of both halves of the couplings.

When inspecting couplings (regardless of design), it is necessary:

• check the condition of the coupling halves for cracks (the presence of cracks is detected by the sound when lightly tapped with a hammer, by oil smudges and dust accumulation near damaged areas or by spots that appear when lightly tapped with a hammer;
• check the stability of the fit of the coupling halves on the shafts;
• check the gap between the end planes;
• check the mutual arrangement of the axes of the connected shafts.

When shifted along the axis, or when the fit on the shaft is weakened, the coupling halves are replaced.

It is not allowed to install gaskets between the shaft and the hole of the hub of the coupling halves and punching the shaft to ensure the tightness of the connection; it is forbidden to weld half-couplings to the shaft. Couplings couplings of all types, bushings of gear couplings that have a crack are subject to mandatory replacement.

When inspecting gear couplings, it is necessary ( , , ):

• check the condition and wear of the teeth of the coupling halves and bushings;
• check the condition of the sealing rings;
• check the mutual position of the axes of the connected shafts;
• when assembling after revision or repair, rinse the internal cavity of the housing with kerosene and, after drying, fill it with fresh lubricant.

Table 6.4 - Normals for the control of axial connections

Table 6.5 - Tolerances for misalignment and radial displacement of the axes of the couplings

Table 6.6 - Permissible wear of the teeth of gear couplings in terms of backlash

Operation of gear couplings is not allowed if more than 10% of the teeth are broken, if the teeth are worn in thickness over 30% of the original size. Dried felt and felt rings should be washed in kerosene, dried and soaked in melted grease; Replace worn O-rings.

In clutches with a serpentine spring, during the revision, the condition of the springs and toothed disks is checked. Broken springs, as well as springs, on the working surface of which cracks and dents are found, are replaced; when removed, suitable springs are marked and laid in the same place where they were previously; scuffs on the surfaces of the teeth are cleaned with a file.

Toothed clutch discs with serpentine springs must be replaced when the teeth are worn in thickness by 30% of the original size, as well as in the presence of broken teeth, if they are unevenly distributed around the circumference and their number exceeds 10% of the total number of teeth. The percentage of tooth wear is determined by the average value of measurements of the thickness of the tooth at three points along the height.

In transversely rolled, sleeve-finger and in couplings with an intermediate disk:

• the value of the relative displacement of the shafts to be connected, measured using a square and a probe at four diametrically located points of the outer surface of the coupling halves, should not exceed 0.3 mm; when the gap increases above the specified limit, the mechanism is centered;
• the difference in the gap measured with a wedge probe at diametrically opposite points should not exceed 0.001 of the outer diameter of the coupling halves; with an increase in this limit, the mechanisms are subject to centering to ensure the alignment of the connected shafts.

In couplings with an intermediate disc, the gap between the protrusions 4 of the disc 3 and the recesses of the coupling halves 1, 2 should not exceed 0.5-2.0 mm, depending on the size of the couplings and their installation locations.

In sleeve-pin couplings, the development of holes for attaching fingers is not allowed. The maximum gap between the elastic rings and holes in the coupling half is allowed no more than 3% of the pin diameter (counting it to the side). With greater wear, the rings must be replaced, and when making holes, replace the coupling halves.

Coupling half defects

The main defects are:

• cracks;
• shaft bore wear.

Couplings with cracks of any nature and location are subject to rejection.

Coupling halves are considered fit if, due to wear of the hole, the gap in the mating increases by no more than 1.5 times from the maximum possible during manufacture. If the hole size exceeds the allowable one, it is necessary to repair the hole by surfacing.

Advantages

The gear coupling is able to compensate for any errors in the alignment of the shafts in a fairly large range.

Design

The gear coupling is a universal type of compensating couplings. Z and consists of 2 gears rigidly fixed on the shafts and a composite cylindrical drum. External involute teeth are cut on the gears, and internal involute teeth are cut on the cylindrical drum, into the cavities of which the teeth of external engagement enter. To give the outer and inner teeth equal strength, a correction is used. To increase the angle of displacement of the axes of the connected shafts, the outer teeth of the wheels are made spherical and barrel-shaped.

Production material

All parts are made of steel 40 or 45HX, 45L - forged, with a diameter of more than 150 mm - cast

Completeness of delivery

Table 1 : Gear Coupling Kit

When accepting the coupling, check the list of delivery according to the table below (the designation of parts is shown in Fig. 1)

Variants of execution and selection of gear coupling

The gear coupling is manufactured in the following types:

1 - with detachable clip;
2 - with an intermediate shaft;
3- with one-piece clip.

Coupling bushings are manufactured in the following versions:

1 - with cylindrical holes for the short ends of the shafts according to GOST 12080:
2-with tapered holes for short shaft ends according to GOST 12081 for couplings of types 1 and 3.

It is allowed to manufacture bushings with holes for the ends of shafts of a different shape at the request of the consumer.

Couplings ordered for operation at speeds equal to or greater than 50% of the value of the allowable frequency specified in Table 1 are marked with the letter C (the requirements of the paragraph are mandatory from 01.06.97). In couplings, a combination of bushings of various designs is allowed.

The designation of the couplings should include the type designation "MZ", the values ​​of the rated torque, the diameters of the mounting holes of the bushings or the holes of the bushings and flange half-couplings, the designation of the bushing version, climatic version and category according to GOST 15150, the designation of this standard. In the designation of the type 2 coupling, the diameter of the bore of the flange coupling half is placed after the designation of the diameter of the bore of the sleeve.

1, 2 - half-couplings with external teeth;

3, 4 - clips; 5 - bolts;

6 - hole for supplying lubricant

table 2: Selection of gear couplings according to the nominal parameters of the electric motor

Coupling symbol example

Type 1 with a rated torque of 4000 Nm, bores in bushings 50 mm. with bushings, version 1, climatic version U. category 2 MZ1I-4000-50-1U2 GOST R Zh95-96

Same. type 2, with a diameter of mounting holes in flanged floor couplings 55 mm: MZ 2-4000-50-55-1U2 GOST R 50895-96

Same. type 1, with bushings of execution 1 in one of which the bore diameter is 55 mm: MZ 1-4000-50-1-55-1U2 GOST R 50895-96

The same, one sleeve of version 1, the other of version 2 with a bore diameter of 55 mm: MZ 1-4000-50-1-55-2U2 GOST R 50895-96

Conditions of transportation and storage

Features of installation and operation

Application area

Couplings gear are applied in the majority in heavy mechanical engineering. They are put on turbines, on piston engines, on rolling mills. While couplings with elastic elements are suitable only for transmitting small and medium torques, the gear coupling is designed for transmitting high torques (up to 63,000 Nm).