CN214837995U

CN214837995U - Friction coupling for point switch

Info

Publication number: CN214837995U
Application number: CN202120658828.1U
Authority: CN
Inventors: 张大增
Original assignee: Beijing Zhongtie Jinmai Technology Service Co ltd
Current assignee: Beijing Zhongtie Jinmai Technology Service Co ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-11-23
Anticipated expiration: 2031-03-31

Abstract

The utility model discloses a friction coupler for a point switch, which comprises a deceleration coupling module, a friction module and a positioning sheet; the deceleration connecting module comprises an input shaft, an output shaft, a gearwheel, a cycloid wheel, an eccentric bearing, an internal gear and a rolling sleeve; the friction module comprises a friction plate assembly, a fixed chuck and an adjusting end cover; one end of the positioning sheet is connected with the shell, the other end of the positioning sheet is provided with a first positioning hole, the periphery of the adjusting end cover is provided with a second positioning hole, and the fastener sequentially penetrates through the first positioning hole and the second positioning hole to be in threaded connection with the adjusting end cover. The advantages are that: the spacer passes through the fastener and links to each other with the adjustment end cover with the casing, stretches into the locating hole in the slot through the fastener and realizes the location, when needing to screw or loosen the adjustment end cover, need not to dismantle the spacer, only need with the spacer with adjust the fastener between the end cover demolish can, not only make the adjustment process more convenient, also avoided dismantling the condition that the spacer caused loses.

Description

Friction coupling for point switch

Technical Field

The utility model relates to a friction coupling technical field especially relates to a friction coupling for goat.

Background

The essential function of an electric switch machine is the overload protection function, and the friction coupling is an important part of the switch machine. The friction coupler has the function that when the turnout meets a jam and the resistance exceeds a set value, the friction coupler starts to rub per se, so that the motor is protected from being burnt out and the turnout pull rod is prevented from deforming. The conventional friction coupling has a problem in that,

1. the locating plate in the existing friction coupler is installed by matching a common outer hexagonal bolt with a flat spring pad. The adjustment of the friction current is only carried out after the positioning sheet is integrally removed every time; however, in the railway outdoor operation environment, in order to fill the slag track section with slag stones, the positioning sheet or the flat spring pad is easily lost during operation, so that the operation cannot be completed.

2. The internal gear of the existing friction coupler is exposed outside, and the friction coupler is applied beside a railway track in a harsh vibration environment, so that equipment is unstable in operation due to long-term operation, and potential safety hazards exist.

3. The existing friction coupler sometimes needs to be detached when in installation operation, but because the friction coupler is not lifted, a lifting ring needs to be installed, and a pry bar is used for double lifting, so that the installation is very inconvenient.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a friction coupling for goat to solve the aforementioned problem that exists among the prior art.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

a friction coupler for a point switch comprises a speed reduction coupling module, a friction module and a positioning sheet; the speed reduction connection module comprises an input shaft, an output shaft, a gearwheel, a cycloidal gear, an eccentric bearing, an internal gear and a rolling sleeve; the gear wheel and the eccentric bearing are sequentially sleeved on the periphery of the input shaft, the eccentric bearing is provided with a cycloid wheel coaxial with the eccentric bearing, and one end of the input shaft, which is far away from the gear wheel, is connected with the output shaft; the output shaft is sequentially sleeved with a roller sleeve and an inner gear, the roller sleeve is circumferentially provided with a plurality of roller rods matched with the cycloidal gear at intervals, and the inner gear is circumferentially provided with a plurality of pin gear pins matched with the cycloidal gear at intervals; a shell coaxial with the inner gear is arranged on one side of the inner gear, which is far away from the roller; the friction module comprises a friction plate assembly, a fixed chuck and an adjusting end cover; the fixed chuck and the shell are coaxially arranged on one side, far away from the internal gear, of the shell, a friction plate assembly connected with the fixed chuck is arranged inside the fixed chuck, the friction plate assembly is connected with the internal gear, the adjusting end cover is in threaded connection with one side, far away from the shell, of the fixed chuck, and the shell is connected with the adjusting end cover through a spring; one end of the positioning sheet is connected with the shell, a first positioning hole is formed in the other end of the positioning sheet, a second positioning hole is formed in the periphery of the adjusting end cover, and a fastening piece sequentially penetrates through the first positioning hole and the second positioning hole to be in threaded connection with the adjusting end cover.

Preferably, the positioning piece comprises a first connecting portion and a second connecting portion, one end of the first connecting portion is fixedly connected with one end of the second connecting portion, the first connecting portion is parallel to the second connecting portion, the lower surface of the first connecting portion is located below the second connecting portion, and the upper surface of the second connecting portion is located above the first connecting portion.

Preferably, the casing periphery wall is provided with the mounting groove that runs through its relative both sides along the direction of its axis, be provided with at least one first mounting hole in the mounting groove, be provided with at least one second mounting hole on the first connecting portion, the fastener passes first mounting hole and second mounting hole will the spacer with casing fixed connection.

Preferably, the second connecting part is provided with a first positioning hole; a plurality of slots which are inwards recessed along the radial direction of the adjusting end cover are circumferentially arranged at intervals on the periphery of the adjusting end cover; and a second positioning hole is formed in each slot, and a fastener penetrates through the first positioning hole and the second positioning hole to fixedly connect the positioning sheet with the adjusting end cover.

Preferably, the friction plate assembly comprises an inner friction plate and an outer friction plate, and an inner friction plate is arranged between two adjacent outer friction plates; the outer friction plate is connected with the fixed chuck, and the inner friction plate is connected with the inner gear; and friction materials are arranged between the adjacent outer friction plates and the adjacent inner friction plates, and the thickness of each friction material is 1.5 mm.

Preferably, one side of the shell, which is far away from the inner gear, is provided with a plurality of blind holes at intervals along the circumferential direction of the shell, a spring is arranged in each blind hole, and one end, which is far away from the shell, of the spring abuts against the outer friction plate.

Preferably, the input shaft is further sleeved with an end cover, an intermediate plate and an inner gear cover plate; the end cover is arranged on one side of the large gear, which is far away from the eccentric bearing; the middle plate and the inner gear cover plate are sequentially arranged between the inner gear and the eccentric bearing; the end cover, the middle plate, the shell and the fixed chuck are fixedly connected together through at least two mounting bolts; the inner gear cover plate is fixedly connected with the inner gear.

Preferably, the internal gear cover plate is fixedly connected with the internal gear along the circumferential direction of the internal gear through a plurality of fastening bolts so as to fix the cycloid wheel, the rolling rod, the rolling sleeve, the pin gear pin and the output shaft into a whole which cannot move relatively.

Preferably, a gasket, a plane bearing and a sealing ring are sequentially arranged between the friction plate assembly and the adjusting end cover.

Preferably, the number of the cycloid gears is two, and a partition plate coaxial with the cycloid gears is arranged between the two cycloid gears.

Preferably, the internal gear is provided with exhaust holes, and the number of the exhaust holes is consistent with that of the pin gear pins.

Preferably, the shell is provided with an integrated lifting handle.

The utility model has the advantages that: 1. the spacer passes through the fastener and links to each other with the adjustment end cover with the casing, stretches into the locating hole in the slot through the fastener and realizes the location, when needing to screw or loosen the adjustment end cover, need not to dismantle the spacer, only need with the spacer with adjust the fastener between the end cover demolish can, not only make the adjustment process more convenient, also avoided dismantling the condition that the spacer caused loses. 2. The inner gear cover plate is arranged, and the cycloidal gear, the rolling rod, the rolling sleeve, the pin gear pin and the output shaft are fixed into a whole body which cannot move relatively through the fastening bolt, so that the parts in the inner gear cavity are guaranteed to have no relative movement, and the friction coupler is guaranteed to be stable and reliable when working for a long time in a vibration environment beside a railway track. 3. Be provided with the integration and carry the handle, the operation is carried on the spot and need not additionally to install rings, can realize carrying and draw, and convenient and fast is difficult for causing spare part to lose.

Drawings

FIG. 1 is an exploded view of a friction coupling in an embodiment of the present invention;

FIG. 2 is a schematic structural view of a positioning plate according to an embodiment of the present invention;

FIG. 3 is an assembly view of a friction coupling according to an embodiment of the present invention

FIG. 4 is a top view of a friction coupling according to an embodiment of the present invention;

FIG. 5 is a side view of a friction coupling in an embodiment of the present invention;

fig. 6 is a schematic view of the friction coupling installed in an electric switch machine according to an embodiment of the present invention;

fig. 7 is a sectional view taken along line a-a of fig. 6 according to an embodiment of the present invention.

In the figure: 1. a housing; 2. an end cap; 3. fixing the chuck; 4. a spring; 5. an outer friction plate; 6. adjusting the end cover; 7. positioning plates; 8. a gasket; 9. an inner friction plate; 10. an internal gear; 11. an output shaft; 12. an input shaft; 13. positioning the gasket; 14. an inner gear cover plate; 15. rolling a rod; 16. rolling; 17. a pin gear pin; 18. a middle plate; 19. a partition plate; 20. a cycloid wheel; 21. a bull gear; 22. a flat bearing; 23. a seal ring; 24. an output shaft bearing; 25. an eccentric bearing; 26. installing a bolt; 27. a first connection portion; 28. a second connecting portion; 29. a first mounting hole; 30. a second mounting hole; 31. a first positioning hole; 32. an adjustment key block; 33. a slot; 34. a direct current motor; 35. a friction coupling; 36. a friction material.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are given by way of illustration only.

As shown in fig. 1 to 7, in the present embodiment, a friction coupling for a switch machine is provided, which includes a speed reducing coupling module, a friction module and a locating plate 7; the speed reduction coupling module comprises an input shaft 12, an output shaft 11, a gearwheel 21, a cycloidal gear 20, an eccentric bearing 25, an internal gear 10 and a roller sleeve 16; the bull gear 21 and the eccentric bearing 25 are sequentially sleeved on the periphery of the input shaft 12, the eccentric bearing 25 is provided with a cycloidal gear 20 coaxial with the eccentric bearing 25, and one end of the input shaft 12, which is far away from the bull gear 21, is connected with the output shaft 11; a roller sleeve 16 and an internal gear 10 are sequentially sleeved on the output shaft 11, a plurality of roller rods 15 matched with the cycloidal gear 20 are circumferentially arranged on the roller sleeve 16 at intervals, and a plurality of pin gear pins 17 matched with the cycloidal gear 20 are circumferentially arranged on the internal gear 10 at intervals; a shell 1 coaxial with the internal gear 10 is arranged on one side of the internal gear 10 away from the roller 16; the friction module comprises a friction plate assembly, a fixed chuck 3 and an adjusting end cover 6; the fixed chuck 3 and the shell 1 are coaxially arranged on one side, far away from the internal gear 10, of the shell 1, a friction plate assembly connected with the fixed chuck 3 is arranged inside the fixed chuck 3, the friction plate assembly is connected with the internal gear 10, the adjusting end cover 6 is in threaded connection with one side, far away from the shell 1, of the fixed chuck 3, and the shell 1 is connected with the adjusting end cover 6 through a spring 4; one end of the positioning plate 7 is connected with the shell 1, a first positioning hole 31 is formed in the other end of the positioning plate 7, a second positioning hole is formed in the periphery of the adjusting end cover 6, and a fastening piece sequentially penetrates through the first positioning hole 31 and the second positioning hole to be in threaded connection with the adjusting end cover 6.

The number of the cycloid gears 20 is two, and a partition plate 19 coaxial with the two cycloid gears 20 is arranged between the two cycloid gears 20.

The outer periphery of the output shaft 11 is sleeved with an output shaft bearing 24 and a positioning gasket 13, and the positioning gasket 13 is located between the output shaft bearing 24 and the internal gear 10.

The positioning piece 7 comprises a first connecting portion 27 and a second connecting portion 28, one end of the first connecting portion 27 is fixedly connected with one end of the second connecting portion 28, the first connecting portion 27 is parallel to the second connecting portion 28, the lower surface of the first connecting portion 27 is located below the second connecting portion 28, and the upper surface of the second connecting portion 28 is located above the first connecting portion 27.

The casing 1 periphery wall is provided with the mounting groove that runs through its relative both sides along the direction of its axis, be provided with at least one first mounting hole 29 in the mounting groove, be provided with at least one second mounting hole 30 on the first connecting portion 27, the fastener passes first mounting hole 29 and second mounting hole 30 will spacer 7 with casing 1 fixed connection.

The second connecting part 28 is provided with a first positioning hole 31; a plurality of slots 33 which are inwards recessed along the radial direction of the adjusting end cover 6 are circumferentially arranged at intervals on the periphery of the adjusting end cover 6; each slot 33 is provided with a second positioning hole, and a fastener penetrates through the first positioning hole 31 and the second positioning hole to fixedly connect the positioning sheet 7 with the adjusting end cover 6. A plurality of adjusting key blocks 32 are arranged on one side, far away from the shell 1, of the adjusting end cover 6 at intervals along the circumferential direction of the adjusting end cover, and an adjusting wrench rotates the adjusting end cover 6 by clamping the adjusting key blocks 32.

The friction plate assembly comprises inner friction plates 9 and outer friction plates 5, and one inner friction plate 9 is arranged between every two adjacent outer friction plates 5; the outer friction plate 5 is connected with the fixed chuck 3, and the inner friction plate 9 is connected with the inner gear 10; and a friction material 36 is arranged between the adjacent outer friction plate 5 and the inner friction plate 9, and the thickness of the friction material 36 is 1.5 mm. The number of the inner friction plates 9 and the number of the outer friction plates 5 can be selected according to actual conditions so as to better meet actual requirements; the number of the outer friction plates 5 is larger than that of the inner friction plates 9, three outer friction plates 5 can be selected, and two inner friction plates 9 can be selected; or the four outer friction plates 5 and the three inner friction plates 9 are arranged, so that the friction torque can be adjusted more easily, and the effect is better.

The inner friction plate 9 and the outer friction plate 5 are arranged in the fixed chuck 3, the sealing effect is good, and the condition that the output torque changes due to the fact that the outer friction plate is affected with damp can be avoided. The outer friction plate 5 and the fixed chuck 3 are in key connection.

The outer friction plate 5 and the outer friction plate 5 are made of materials with moderate hardness, and have the advantages of good wear resistance, stable friction force and long service life. The friction plate and the friction material 36 are both made of anti-oxidation materials, have good corrosion resistance, and can effectively avoid the condition that the friction performance is unstable due to the fact that the friction plate is affected with damp and rusts.

One side of the shell 1, which is far away from the inner gear 10, is provided with a plurality of blind holes at intervals along the circumferential direction of the shell, a spring 4 is arranged in each blind hole, and one end, which is far away from the shell 1, of the spring 4 abuts against the outer friction plate 5.

The friction plate is arranged in the fixed chuck 3, and the pressure of the springs 4 which are uniformly distributed on one side surface of the shell 1 in the circumferential direction is adjusted through the adjusting end cover 6, so that the friction force of the friction coupler 35 is adjusted.

In this embodiment, the large gear 21 is driven by a dc motor 34, and a pinion for driving the large gear 21 is connected to an output shaft 11 of the dc motor 34; the direct current motor 34 drives the large gear 21 to rotate through the small gear, and primary speed reduction is achieved. The cycloid wheel 20 mounted on the eccentric bearing 25 rotates for two revolutions along with the rotation of the input shaft 12 to drive the output shaft 11 to rotate, thereby realizing two-stage speed reduction. The cycloid gear 20 is engaged with the pin 17 mounted on the internal gear 10 during revolution and rotation.

When the turnout is not switched in place, the output shaft 11 does not rotate, the direct current motor 34 idles, and the friction coupler 35 begins to rub. The cycloidal gear 20 revolves to drive the inner gear 10 provided with the outer friction plate 5 to rotate, the outer friction plate 5 arranged on the fixed chuck 3 and the inner friction plate 9 connected with the inner gear 10 in key joint rub with each other under the pressure action of the spring 4, the pressure of the spring 4 is changed by screwing or loosening the adjusting end cover 6 through an adjusting wrench, and then the friction torque is adjusted, and finally the friction current is ensured to be in a reasonable range. After the adjustment is finished, the position of the adjusting end cover 6 is locked by using the positioning piece 7, so that the change of friction torque caused by the rotation of the adjusting end cover is prevented.

When the adjusting end cover 6 is screwed or loosened by the adjusting wrench, the screwing or loosening adjustment can be performed only by detaching the fasteners inserted into the first positioning holes 31 and the second positioning holes of the adjusting end cover 6 on the positioning piece 7 without detaching the positioning piece 7, and after the adjustment is completed, the fasteners are inserted into the first positioning holes 31 and the second positioning holes to limit the telescopic length of the spring 4, so that the friction torque is adjusted; the whole process is free from dismounting the positioning sheet 7, and the problems that the positioning sheet 7 is lost and inconvenient to install due to the fact that the positioning sheet 7 is dismounted and the friction torque is adjusted in the prior art are solved.

In this embodiment, the input shaft 12 is further sleeved with an end cover 2, an intermediate plate 18 and an inner gear cover plate 14; the end cover 2 is arranged on one side of the large gear 21 far away from the eccentric bearing 25; the intermediate plate 18 and the internal gear cover plate 14 are sequentially disposed between the internal gear 10 and the eccentric bearing 25; the end cover 2, the middle plate 18, the shell 1 and the fixed chuck 3 are fixedly connected together through at least two mounting bolts 26; the inner gear cover 14 is fixedly connected to the inner gear 10.

The internal gear cover plate 14 is fixedly connected with the internal gear 10 along the circumferential direction of the internal gear 10 through a plurality of fastening bolts so as to fix the cycloid wheel 20, the roller 15, the roller sleeve 16, the pin 17 and the output shaft 11 as a whole which is not relatively movable. The parts in the cavity of the internal gear 10 do not have relative displacement, so that the equipment is stable and reliable when working in a vibration environment beside a railway track for a long time; the series of potential safety hazards existing in the exposed internal gear 10 of the conventional friction coupling 35 are avoided.

And a gasket 8, a plane bearing 22 and a sealing ring 23 are sequentially arranged between the friction plate assembly and the adjusting end cover 6. The plane bearing 22 is a plane needle bearing, so that the frictional resistance between the outer friction plate 5 and the adjusting end cover 6 during adjusting the frictional torque can be reduced.

The internal gear 10 is provided with exhaust holes, and the number of the exhaust holes is consistent with that of the pin gear pins 17.

In this embodiment, the housing 1 is provided with an integrated lifting handle. The integrated lifting handle can be used for lifting through the integrated lifting handle by directly utilizing a hoisting machine without installing a lifting ring when the positioning sheet 7 is detached and the adjusting end cover 6 is screwed or loosened. The dismouting process is convenient and fast, is difficult for causing spare part to lose.

Through adopting the utility model discloses an above-mentioned technical scheme has obtained following profitable effect:

the utility model provides a friction coupling for goat, spacer pass through the fastener and link to each other with the adjustment end cover with the casing, realize the location in stretching into the locating hole in the slot through the fastener, when needing to screw or loosen the adjustment end cover, need not to dismantle the spacer, only need with the spacer with the fastener between the adjustment end cover demolish can, not only make the adjustment process more convenient, also avoided dismantling the condition that the spacer caused loses. The inner gear cover plate is arranged, and the cycloidal gear, the rolling rod, the rolling sleeve, the pin gear pin and the output shaft are fixed into a whole body which cannot move relatively through the fastening bolt, so that the parts in the inner gear cavity are guaranteed to have no relative movement, and the friction coupler is guaranteed to be stable and reliable when working for a long time in a vibration environment beside a railway track. Be provided with the integration and carry the handle, the operation is carried on the spot and need not additionally to install rings, can realize carrying and draw, and convenient and fast is difficult for causing spare part to lose.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be viewed as the protection scope of the present invention.

Claims

1. A friction coupling for a switch machine, characterized in that: the device comprises a deceleration coupling module, a friction module and a positioning sheet; the speed reduction connection module comprises an input shaft, an output shaft, a gearwheel, a cycloidal gear, an eccentric bearing, an internal gear and a rolling sleeve; the gear wheel and the eccentric bearing are sequentially sleeved on the periphery of the input shaft, the eccentric bearing is provided with a cycloid wheel coaxial with the eccentric bearing, and one end of the input shaft, which is far away from the gear wheel, is connected with the output shaft; the output shaft is sequentially sleeved with a roller sleeve and an inner gear, the roller sleeve is circumferentially provided with a plurality of roller rods matched with the cycloidal gear at intervals, and the inner gear is circumferentially provided with a plurality of pin gear pins matched with the cycloidal gear at intervals; a shell coaxial with the inner gear is arranged on one side of the inner gear, which is far away from the roller; the friction module comprises a friction plate assembly, a fixed chuck and an adjusting end cover; the fixed chuck and the shell are coaxially arranged on one side, far away from the internal gear, of the shell, a friction plate assembly connected with the fixed chuck is arranged inside the fixed chuck, the friction plate assembly is connected with the internal gear, the adjusting end cover is in threaded connection with one side, far away from the shell, of the fixed chuck, and the shell is connected with the adjusting end cover through a spring; one end of the positioning sheet is connected with the shell, a first positioning hole is formed in the other end of the positioning sheet, a second positioning hole is formed in the periphery of the adjusting end cover, and a fastening piece sequentially penetrates through the first positioning hole and the second positioning hole to be in threaded connection with the adjusting end cover.

2. The point machine friction coupling as set forth in claim 1, wherein: the locating piece comprises a first connecting portion and a second connecting portion, one end of the first connecting portion is fixedly connected with one end of the second connecting portion, the first connecting portion is parallel to the second connecting portion, the lower surface of the first connecting portion is located below the second connecting portion, and the upper surface of the second connecting portion is located above the first connecting portion.

3. The point machine friction coupling as set forth in claim 2, wherein: the casing periphery wall is provided with the mounting groove that runs through its relative both sides along the direction of its axis, be provided with at least one first mounting hole in the mounting groove, be provided with at least one second mounting hole on the first connecting portion, the fastener passes first mounting hole and second mounting hole will the spacer with casing fixed connection.

4. A switch machine friction coupling as set forth in claim 3, wherein: the second connecting part is provided with a first positioning hole; a plurality of slots which are inwards recessed along the radial direction of the adjusting end cover are circumferentially arranged at intervals on the periphery of the adjusting end cover; and a second positioning hole is formed in each slot, and a fastener penetrates through the first positioning hole and the second positioning hole to fixedly connect the positioning sheet with the adjusting end cover.

5. The point machine friction coupling of claim 4, wherein: the friction plate assembly comprises an inner friction plate and an outer friction plate, and an inner friction plate is arranged between every two adjacent outer friction plates; the outer friction plate is connected with the fixed chuck, and the inner friction plate is connected with the inner gear; and friction materials are arranged between the adjacent outer friction plates and the adjacent inner friction plates, and the thickness of each friction material is 1.5 mm.

6. The point machine friction coupling of claim 5, wherein: one side of the shell, which is far away from the inner gear, is provided with a plurality of blind holes at intervals along the circumferential direction of the shell, a spring is arranged in each blind hole, and one end, which is far away from the shell, of the spring abuts against the outer friction plate.

7. The point machine friction coupling of claim 6, wherein: the input shaft is also sleeved with an end cover, an intermediate plate and an inner gear cover plate; the end cover is arranged on one side of the large gear, which is far away from the eccentric bearing; the middle plate and the inner gear cover plate are sequentially arranged between the inner gear and the eccentric bearing; the end cover, the middle plate, the shell and the fixed chuck are fixedly connected together through at least two mounting bolts; the inner gear cover plate is fixedly connected with the inner gear.

8. The point machine friction coupling of claim 7, wherein: the inner gear cover plate is fixedly connected with the inner gear through a plurality of fastening bolts along the circumferential direction of the inner gear so as to fix the cycloid wheel, the rolling rod, the rolling sleeve, the pin gear pin and the output shaft into a whole which can not move relatively.

9. The point machine friction coupling of claim 7, wherein: and a gasket, a plane bearing and a sealing ring are sequentially arranged between the friction plate assembly and the adjusting end cover.

10. The point machine friction coupling of claim 8, wherein: the number of the cycloid wheels is two, and a partition board coaxial with the cycloid wheels is arranged between the two cycloid wheels.

11. The point machine friction coupling of claim 10, wherein: the inner gear is provided with exhaust holes, and the number of the exhaust holes is consistent with that of the pin gear pins.

12. The point machine friction coupling of claim 11, wherein: an integrated lifting handle is arranged on the shell.