TWM504087U - Structure of torque limiting and conic brake assembly of power winch - Google Patents

Description

Torque limit of power winch and structure of tapered brake assembly

This creation is about a torque limit of a power winch and a cone brake assembly structure, especially when the reverse torque generated by the load bearing capacity of the power winch exceeds that of the power source of the power winch, and the power transmission is disconnected in time. At the same time, a conical braking action is generated to avoid the torque limitation of the power winch and the ratchet brake assembly structure in which the transmission mechanism is damaged.

According to the power winch, it is designed to be used as a hanging load or a drag load. The most common example is the "lifting hoist" used for vertical lifting of high-rise hanging goods. It is a kind of power winch; in addition, it is installed in jeep and off-road vehicles. The cable hoisting machine used to haul it (he saved) or dangerously moved out of danger (self-rescue) is also a power winch. The driving principle of the power winch is to output the forward or reverse transmission power by a power source (such as a power motor), and after a speed reduction mechanism, drive a cable wheel to rotate forward or reverse to send the cable or retract The cable, the front end of the cable is hooked by a heavy hook to hook the load (heavy object, its car or other things, etc.) to move the load.

The power winch is used in the load because it carries the load (the cargo or the person or the object), and the load sometimes exceeds the torque that the power source can bear (this involves the load capacity of the power source), so the torque to avoid the load is powered. The source cannot be tolerated. Generally, a "torque limiting mechanism" with weight overload protection is installed inside the transmission mechanism, so that when the load is overloaded, the torque limiting mechanism must idle and slip without transmitting power to protect the power winch. The transmission mechanism (such as power motor and speed reduction mechanism) avoids overload and damages the machine parts. At the same time, there is a "no-power brake mechanism" inside the transmission mechanism, so that when the power winch is unpowered (for example, When the stop button or sudden power failure occurs, the brake mechanism temporarily brakes the transmission process, which is also used to protect the transmission mechanism from damage.

However, the "torque limiting mechanism" and "unpowered braking mechanism" used in the conventional power winch are often designed as two distinct devices. For example, the existing "current overload protector" is commonly used as a torque limiting mechanism. When the load torque is increased, the power source current is also increased. Therefore, the power source is stopped when the current is overloaded, thereby indirectly restricting the torque; and the existing "electromagnetic brake clutch" is used as the The power brake mechanism; the "current overload protector" and the "electromagnetic brake clutch" are respectively installed in different parts of the transmission process of the power winch. This phenomenon is caused by the double cost waste, and more often because of the two mechanisms. The compatibility is not good, resulting in the use of the product is not smooth, long-term use of fear of component damage.

Except for the power winch, the "current overload protector" is used as the torque limiting mechanism, and when the "electromagnetic brake clutch" is used as the unpowered brake mechanism, it is completely unusable in the event of a power outage; in addition, the "current overload protector" And the "electromagnetic brake clutch" has a buffer time for stopping and starting, so it can not produce immediate effect. Therefore, in the power winch, there is a phenomenon that the power transmission cannot be stopped immediately when the load is overloaded, and the phenomenon that it cannot be stopped immediately is apparent. Poor practicality.

In response to the above-mentioned shortcomings, the creator insists on the spirit of excellence in the creation, and is deeply conceived in research and development and improvement.

The reason is that the main purpose of this creation is to provide a torque-limiting and ratcheting brake in a transmission mechanism that integrates a component that can generate a torsional force limit with a component that can produce a cone-shaped brake. Double effect.

In order to achieve the above objectives, the creation system designs a torque limit of the power winch and a cone brake assembly structure, and has a frame body, a power source installed on one side of the frame body, and has the capability of outputting power; The reduction gearbox on the other side of the frame body is internally provided with a speed reduction mechanism for receiving the power transmission of the power source via a long shaft for deceleration; and a cable wheel disposed in the middle of the frame body to receive the reduction gear box The output power drives the rotation; the long shaft and the speed reduction mechanism are indirectly transmitted by a section of the shaft, and the shaft is sleeved on the long shaft without contact, and the two ends of the shaft are respectively An engaging groove and an annular engaging groove are provided, and a positioning hole is arranged on the shaft body, and one end of the shaft is interlocked with the engaging tooth of the end and the speed reducing mechanism is engaged, and is inserted by a C-shaped buckle An elastic member is disposed on the shaft in the engaging groove of the end, and one end of the elastic member is inserted into the positioning hole of the shaft; and the power transmission between the long shaft and the speed reducing mechanism is In the process, a cone is installed a brake action group and a torque limiting mechanism, wherein

The tapered brake action group is composed of a brake block, a disc-shaped convex ring body, a 锲-shaped block and a protrusion; the outer edge of the brake block is formed as an outer obliquely enlarged tapered friction surface, and a central opening is provided. a large perforation; the disc-shaped convex ring body is composed of a disc-shaped portion and a convex ring body portion, and the disc-shaped portion is locked with the brake block as a common rotating body, and the convex ring body portion enters the large brake block. The perforation is sleeved on the shaft in a non-contact relationship, and the convex ring body portion and the large perforation of the brake block have a spacing, and the outer wall end surface of the convex ring body portion has a plurality of high and low undulating slopes, and the outer wall is opposite a protruding convex body is arranged at the end, and the other end of the elastic member abuts against the rear end surface of the convex ring body portion to push the common rotating body to have an outward movement; the central hole of the 锲 shaped block is The wall is provided with engaging teeth, and is engaged with the engaging teeth on the ring wall of the other end of the shaft, and is locked by a C-shaped buckle in the engaging groove of the end, and the connecting block is provided with The inclined surface of the disc-shaped convex ring body and the inclined surface and the convex body corresponding to the convex body, but the The convex body of the 锲-shaped block is angularly different from the convex body of the disk-shaped convex ring body; the protruding piece is formed inside an inner casing, and the inner casing is sleeved on the long axis, facing The end of the 块-shaped block is an opening, and a hole is formed away from the end of the 块-shaped block, and the annular wall of the open end of the inner casing is non-adhesively inserted into the large perforation of the brake block and the disc-shaped convex ring Between the convex body of the body and the convex body of the circular block, the protrusion is formed on the inner ring wall of the open end of the inner casing, and corresponds to the convex body of the disc-shaped convex ring body and the dome a convex body of a block;

The torsion limiting mechanism is composed of a torsion shaft, a friction plate, a brake pad, a disc-shaped elastic member, an adjusting positioning ring and a positioning screw ring. The torsion shaft is internally provided with an axial through slot, and the front end is Forming a card groove, the outer ring is formed with a screw segment, and an axially deep positioning hole is formed, and the rear end has a ring wall; the friction plate is a ring-shaped piece having a friction surface; the brake pad is The annular sheet body formed by the material has a positioning convex body on the inner edge; the disc-shaped elastic member has a concave arc shape and has compressive elasticity; the outer ring of the adjusting positioning ring has a plurality of positioning pieces, which can be selected to be positioned The direction of the spiral ring is deflected; the positioning screw has a shaft hole with a reverse internal thread, and a plurality of positioning grooves arranged symmetrically on the outer ring are provided for the selected positioning screw to be deflected and rested; When assembled, the torsion shaft passes through the friction plate and the through hole of the inner casing, so that the friction plate is attached to the ring wall of the torsion shaft, and the through hole of the torsion shaft is sleeved outside the long shaft, so that The end of the long shaft is inserted into the card slot of the torsion shaft to make an adhesive joint, and then The brake cover is sleeved on the torsion shaft, so that the positioning protrusion of the brake pad enters the positioning hole of the torsion axis, and the disc-shaped elastic member, the adjustment positioning ring and the positioning screw ring are The sleeve is sleeved on the torsion shaft, and the shaft hole of the positioning screw is screwed into the screw shaft of the torsion shaft until the torque shaft, the friction plate, the inner casing, the brake pad and the disk elastic member are tightened. After the positioning ring and the positioning screw ring are adjusted, the positioning piece of the adjusting positioning ring is deflected toward the corresponding positioning groove on the positioning screw ring.

With regard to the above-mentioned objectives, the technical means and the achievable effects of the present invention, the following preferred embodiments are described in detail with reference to the accompanying drawings, and can be fully understood.

Referring to the first embodiment, the present embodiment is a power winch 1 having a frame 10; a power source 20, for example, a power motor, mounted on the side of the frame 10, having an output The power of the power source or the reverse power; a speed reducer 30 is mounted on the other side of the frame body 10, and a speed reduction mechanism 32 (shown in FIG. 5) is disposed therein, and the power transmission of the power source 20 is received to perform The speed reducing action; and a cable pulley 40 are disposed in the middle of the frame body 10, and receive the power outputted by the speed reducer 30 to rotate the wire to perform the action of feeding the steel cable (not shown) or retracting the cable.

Please refer to the second to fifth figures. After the rear cover 301 is disassembled, the long shaft 21 that receives the synchronous rotation of the shaft of the power source 20 is directly inserted from the center of the inner ring shell 31. Extendingly, the end of the long shaft 21 is formed into a non-circular (for example, hexagonal) end portion 211; the innermost deep end surface of the rear cover 301 is disposed as a receiving recess 302 (fifth figure The inner space of the inner ring shell 31 is assembled with the speed reducing mechanism 32 (shown in the fifth figure), which is sequentially driven by several layers of planetary gear sets. And decelerating, together formed as a speed reduction mechanism 32; the outer side inner edge of the inner ring shell 31 is an obliquely inclined radial friction surface 312; a section of the shaft 33 is sleeved on the long shaft 21 without contact relationship (that is, the long shaft 21 is spaced through the longitudinal shaft hole of the shaft 33), and the ring walls of the two ends are respectively provided with engaging teeth 331, 332 and annular engaging grooves 333, 334, and the shaft body A positioning hole 335 is disposed on the shaft 33. The end of the shaft 33 having the engaging tooth 331 and the engaging groove 333 extends into the central through hole 311 of the inner ring shell 31, and is engaged by the end. The 331 is interlocked with the reduction gear set 32, and is inserted into the engagement groove 333 (shown in FIG. 5) by a C-shaped buckle 336 to restrict the section 33 from being arbitrarily detached; The bushing is preferably disposed on the shaft 33, and one end is inserted into the positioning hole 335 to be positioned;

There is a brake block 34, which is made of rubber to form the material, the outer edge is formed as an outer obliquely enlarged conical friction surface 341, the rear is formed as a circular groove 342 (shown in the third figure), and a large perforation 343 is opened in the center; A disc-shaped convex ring body 35 is preferably formed by a strong material, and can be divided into a disc-shaped portion 351 and a convex ring portion 352 (shown in the second figure), wherein the disc-shaped portion 351 is directly attached to the disc-shaped portion 351. The brake block 34 has a circular groove 342, and the brake block 34 and the disc-shaped protrusion 35 are locked into a "common rotating body" by a plurality of locking members (such as bolts and screw holes), and The convex ring body portion 352 enters the large through hole 343 of the brake block 34, but there is a significant distance between the outer annular surface of the convex ring body portion 352 and the inner annular surface of the large through hole 343, and the convex ring body portion 352 The outer wall end surface has a plurality of high and low sloping slopes 353, and the opposite ends of the outer wall are provided with a protruding convex body 354, and a ring abutting groove 355 is formed on the rear end surface of the convex ring body portion 352 (shown in the third figure); As shown in the fifth figure, the common rotating body of the brake block 34 and the disc-shaped convex body 35 are locked. The other end of the elastic member 34 is inserted into the ring abutment groove 355 of the rear end surface of the convex ring body portion 352 to push the "co-rotation". Body has a tendency to move outward;

There is a shackle 36, the inner wall of the central rim is provided with engaging teeth 361, which can be engaged with the engaging teeth 332 of the ring 33 of the shaft 33, that is, the shaft 33 and the shackle 36 There is a relationship between the two directly driving rotations, and a set of C-shaped buckles 362 are fastened in the engaging grooves 334 of the shaft 33 to make the 块-shaped block 36 cannot be over-shifted on the shaft 33. The beak block 36 is provided with a slope 363 corresponding to the inclined surface 353 of the disc-shaped convex ring body 35 and the convex body 354 and the convex body 364. However, the convex bodies 354 and 364 are disposed on each other. Some of the micro-angle differences; an inner casing 37, the end facing the crotch block 36 is all an opening 371 (shown in the third figure), and a hole 372 is formed away from the end of the crotch block 36, and the disk is internally matched a convex body 354 of the convex ring body 35 and a convex body 364 of the squat block 36, and a corresponding set of protrusions 373 are formed on the inner ring wall; wherein, the brake blocks 34 and the disk shape are convex The ring body 35, the 锲-shaped block 36 and the protrusion 373 of the inner casing 37 are combined to form a "taper braking action group" which can produce a cone-shaped braking action;

A torque limiting mechanism A is composed of a torsion shaft 38, a friction plate 391, a brake pad 392, a disc-shaped elastic member 393, an adjustment positioning ring 394 and a positioning screw 395. The torque shaft 38 is provided. An axial through slot 381 (shown in FIG. 3) is formed inside, and the front end is formed into a non-circular latching slot 382, which may be, for example, a hexagonal shape, and is connected to the latching end portion 211 of the long shaft 21 Corresponding fit, the outer ring is formed with a small section of the screw portion 383 having a reverse external thread, the front end is a positioning concave section 384, and an axially deep positioning hole 385 is provided at one end, and a ring wall 386 is formed at the rear end; The friction plate 391 is a ring-shaped sheet having a frictional surface; the brake pad 392 is an annular piece formed of a material, and the inner edge has a positioning protrusion 3921; the disk-shaped elastic member 393 has a concave arc shape. The outer ring of the adjusting positioning ring 394 has a plurality of positioning pieces 3941 which can be selected and deflected toward the positioning screw 395; the positioning screw 395 has a shaft hole 3951 with a reverse internal thread. And a plurality of positioning grooves 3952 arranged symmetrically on the outer ring for selecting the positioning snail The piece 3941 deflects into the stop.

Referring to the fifth figure, when assembling, the torsion shaft 38 is inserted through the friction plate 391 and the through hole 372 of the inner casing 37, so that the friction plate 391 is attached to the ring wall 386, and then the torque is applied. The through slot 381 of the shaft 38 is sleeved outside the long shaft 21, and the latching end 211 of the end of the long shaft 21 is inserted into the latching slot 382 of the torsion shaft 38 for adhesive engagement. The opening 371 end of the inner casing 37 is also inserted into the gap between the convex ring body portion 352 and the large through hole 343 to make a non-adhesive insertion, and the dome block 36 and the disk-shaped convex ring body 35 are simultaneously inserted. The upper cams 364 and 354 are located on the side of the protrusion 373 in the inner casing 37. Then, the brake pad 392 is sleeved on the torsion shaft 38 outside the inner casing 37. The positioning protrusion 3921 is inserted into the positioning hole 385, and then the disc-shaped elastic member 393, the adjusting positioning ring 394 and the positioning screw 395 are sequentially sleeved on the torsion shaft 38, and the positioning screw 395 is The shaft hole 3951 is tightly engaged with the screw segment 383 until the torque shaft 38, the friction plate 391, the inner casing 37, the brake pad 392, the disk elastic member 393, and the adjustment positioning ring 394 are tightened. Positioning the spiral ring 395 (that is, the torque limiting mechanism A and the inner casing 37 are forced to be tight), of course, the degree of tightness (that is, the amount of screwing of the shaft hole 3951 and the screw segment 383) must be regarded as the power source. 20 can withstand the torque and adjust the selection (the power source 20 can withstand the torque is proportional to the degree of compression), when the degree of compression is selected, the positioning piece 3941 of the adjustment positioning ring 394 corresponds to the positioning screw 395 ( The positioning groove 3951 of the adjacent portion is biased to be offset to make the positioning screw 395 unable to rotate and exit, and the positioning piece 3941 which is not corresponding (adjacent) to the positioning groove 3951 is not bent; finally, the back cover is The 301 is covered to position the positioning recess 384 of the torsion shaft 38 into the inner ring of the bearing 303 received in the receiving recess 302 of the rear cover 301.

When the power source 20 is activated (whether outputting forward power or reverse power), the long shaft 21 is rotated by the power source 20, and is in close contact with the card slot 382 via the latch end 211. Sexual engagement, the torque limiting mechanism A is rotated synchronously with the inner casing 37, and the convex bodies 354, 364 are synchronously rotated through the protrusions 373 in the inner casing 37, and the ridges 36 are simultaneously rotated. The engaging teeth 361 are engaged with the engaging teeth 332 of the ring shaft 33 of the segment shaft 33 in a cooperating relationship, and the shaft 33 is rotated to drive the speed reducing mechanism 32 to generate a predetermined deceleration and drive the cable wheel 40. Rotate to take out the cable (not shown) or retract the cable.

When the power source 20 is stopped (possibly stopped by manipulation or stopped due to sudden power failure), the long shaft 21, the torque limiting mechanism A and the inner casing 37 are immediately followed to stop, but the cable pulley 40 is The steel cable is subjected to the load, so that a reverse torque is generated, and the shaft 33 and the beak block 36 are pushed to reverse rotation by the linkage of the cable and the speed reduction mechanism 32. Therefore, the wire block 36 is rotated. The upper convex body 364 is separated from the protrusion 373 of the inner casing 37, and the inclined surface 363 of the inner block 37 instantaneously pushes the inclined surface 353 of the disc-shaped convex ring body 35 so that the inclined surface 353 is pressed. The disc-shaped convex ring body 35 moves rapidly toward the inner ring shell 31, so that the tapered friction surface 341 of the brake block 34 quickly contacts the oblique friction surface 312 of the inner ring shell 31, resulting in the brake block 34. The braking action of the brakes is such that the jaw block 36, the segment shaft 33, the speed reduction mechanism 32, the cable pulley 40 and the cable are all stopped, such that the brake block 34, the disc-shaped convex ring body 35, and the beak block 36 And the "conical brake action group" which is formed by the protrusions 373 of the inner casing 37, which produces a tapered brake .

The power source 20, whether it is starting to rotate or stop rotating, generates a reverse torque as long as the cable is suspended, and when the reverse torque is the braking effect and/or the power source 20 is sufficient to withstand, no problem. However, when the reverse torque is caused by the braking action and/or close to the power source 20, the reverse torque forces the cymbal block 36 to push the inner casing 37 to rotate in the reverse direction. The shaft 38 follows the power source 20 to stop rotating, so the rotation of the inner casing 37 forces the friction plate 391 to follow the rotation, but the torsion shaft 38 and the brake pad 392 are disengaged from the tight state between the inner casing 37. It does not move to protect the power source 20 from damage.

It can be seen from the above that the present invention is mainly for the power transmission process in which the power winch is powered by the power source 20 and transmitted through the long shaft 21 to the speed reduction mechanism 32. The torque shaft 38, the friction plate 391 and the brake pad 392 are installed. a torque limiting mechanism A composed of a disc-shaped elastic member 393, an adjustment positioning ring 394 and a positioning screw 395, and a brake block 34, a disc-shaped convex ring body 35, a beak-shaped block 36 and a projection 373 The "conical brake action group" jointly formed, in order to ensure that the reverse torque generated by the power winch carrying the load exceeds that of the power source, the power transmission is disconnected in time and the cone brake function is simultaneously generated, thereby ensuring the power source 20 and The transmission mechanism will not exceed its load capacity to avoid damage.

In summary, the torque limit mechanism and the cone brake action group disclosed in this creation have not seen the past, and can indeed achieve the intended purpose of creation. It has already possessed novelty and practical progress, and filed a patent application according to law. I would like to ask for a review and give approval.

1‧‧‧Power winch
10‧‧‧ ‧ body
20‧‧‧Power source
21‧‧‧ long axis
211‧‧‧Card end
30‧‧‧ Gearbox
301‧‧‧Back cover
302‧‧‧ accommodating grooves
303‧‧‧ bearing
31‧‧‧ Inner ring shell
311‧‧‧Central Perforation
312‧‧‧ oblique friction surface
32‧‧‧Deceleration mechanism
33‧‧‧ axis
331‧‧‧Joint teeth
332‧‧‧ joint teeth
333‧‧‧ joint slot
334‧‧‧ joint groove
335‧‧‧Positioning holes
336‧‧‧C-shaped buckle
337‧‧‧Flexible components
34‧‧‧ brake block
341‧‧‧ oblique friction surface
342‧‧‧round groove
343‧‧‧ large perforation
40‧‧‧ cable wheel
35‧‧‧ disc-shaped convex ring
351‧‧‧ disc-shaped parts
352‧‧‧ convex ring body
353‧‧‧Slope
354‧‧‧ convex body
355‧‧
36‧‧‧锲 Shaped block
361‧‧‧joint teeth
362‧‧‧C-shaped buckle
363‧‧‧Bevel
364‧‧‧ convex body
37‧‧‧ inner casing
371‧‧‧ openings
372‧‧‧Perforation
373‧‧‧
A‧‧‧Torque Limiting Agency
38‧‧‧Torque shaft
381‧‧‧through slot
382‧‧‧ card slot
383‧‧‧ screw section
384‧‧‧ positioning recess
385‧‧‧ positioning hole
386‧‧‧
391‧‧‧ Friction plate
392‧‧‧ brake pads
3921‧‧‧ convex body
393‧‧‧Disc elastic parts
394‧‧‧Adjust the positioning ring
3941‧‧‧ Positioning film
395‧‧‧ Positioning screw
3951‧‧‧Axis hole
3952‧‧‧ positioning groove

The first figure shows an external perspective view of the present embodiment. The second figure is a perspective exploded view of the present embodiment. The third figure is a perspective exploded view of another angle of the present embodiment. The fourth figure shows an exploded perspective view of the torsion limiting mechanism in the present embodiment. The fifth figure shows a combined cross-sectional view of the present embodiment.

10‧‧‧ ‧ body

20‧‧‧Power source

21‧‧‧ long axis

211‧‧‧Card end

301‧‧‧Back cover

302‧‧‧ accommodating grooves

303‧‧‧ bearing

31‧‧‧ Inner ring shell

311‧‧‧Central Perforation

312‧‧‧ oblique friction surface

32‧‧‧Deceleration mechanism

33‧‧‧ axis

331‧‧‧Joint teeth

332‧‧‧ joint teeth

333‧‧‧ joint slot

334‧‧‧ joint groove

335‧‧‧Positioning holes

337‧‧‧Flexible components

34‧‧‧ brake block

341‧‧‧ oblique friction surface

343‧‧‧ large perforation

35‧‧‧ disc-shaped convex ring

351‧‧‧ disc-shaped parts

352‧‧‧ convex ring body

353‧‧‧Slope

354‧‧‧ convex body

36‧‧‧锲 Shaped block

361‧‧‧joint teeth

362‧‧‧C-shaped buckle

363‧‧‧Bevel

364‧‧‧ convex body

37‧‧‧ inner casing

372‧‧‧Perforation

A‧‧‧Torque Limiting Agency

38‧‧‧Torque shaft

382‧‧‧ card slot

383‧‧‧ screw section

384‧‧‧ positioning recess

385‧‧‧ positioning hole

386‧‧‧

391‧‧‧ Friction plate

392‧‧‧ brake pads

3921‧‧‧ Positioning convex

393‧‧‧Disc elastic parts

394‧‧‧Adjust the positioning ring

3941‧‧‧ Positioning film

395‧‧‧ Positioning screw

3951‧‧‧Axis hole

3952‧‧‧ positioning groove

Claims (1)

The torque limit of the power winch and the structure of the cone brake assembly have a frame body, a power source mounted on one side of the frame body, and capable of outputting power; and a deceleration installed on the other side of the frame body The box is internally provided with a speed reducing mechanism for receiving the power transmission of the power source through a long shaft for deceleration; and a cable wheel disposed in the middle of the frame body to receive the power outputted by the speed reducer to rotate; An indirect transmission power is transmitted between the shaft and the speed reduction mechanism by a section of the shaft, and the shaft is sleeved on the long shaft without a contact relationship, and the ring walls of the two ends of the shaft are respectively provided with engaging teeth and an annular joint. a slot is disposed on the shaft body, and a positioning hole is disposed on the shaft body, and one end of the shaft is engaged with the speed reducing mechanism by the engaging tooth of the end, and is inserted into the engaging groove of the end by a C-shaped buckle. An elastic member is disposed on the segment shaft, and one end of the elastic member is inserted into the positioning hole of the shaft; and the utility model is characterized in that: a cone brake is arranged during power transmission between the long shaft transmission and the speed reduction mechanism Action group and a torque limiting mechanism, Wherein, the tapered brake action group is composed of a brake block, a disc-shaped convex ring body, a 锲-shaped block and a protrusion; the outer edge of the brake block is formed as an outer obliquely enlarged tapered friction surface, and the center Opening a large perforation; the disc-shaped convex ring body is composed of a disc-shaped portion and a convex ring body portion, and the disc-shaped portion is locked with the brake block as a common rotating body, and the convex ring body portion enters the brake block The large perforation is sleeved on the shaft in a non-contact relationship, and the convex ring body portion and the large perforation of the brake block have a spacing, and the outer wall end surface of the convex ring body portion has a plurality of high and low undulating slopes. a convex body is formed at an opposite end of the outer wall, and the other end of the elastic member abuts against the rear end surface of the convex body portion to push the common rotating body to move outward; the central hole of the circular block The inner wall of the rim is provided with engaging teeth, and is engaged with the engaging teeth on the ring wall of the other end of the shaft, and is locked by a C-shaped buckle in the engaging groove of the end. a bevel and a tenon corresponding to the inclined surface and the convex body of the disc-shaped convex ring body The convex body of the beak block is angularly different from the convex body of the disc-shaped convex ring body; the protrusion is formed inside an inner casing, and the inner casing is sleeved on the long axis The opening facing the 块-shaped block is an opening, and a hole is formed away from the end of the 块-shaped block, and the annular wall of the open end of the inner casing is non-adhesively inserted into the large perforation of the brake block and the disk Between the convex body of the convex ring body and the convex body of the circular block, the protrusion is formed on the inner ring wall of the open end of the inner casing, and corresponds to the convex body of the disc-shaped convex ring body and The torsion force limiting mechanism is composed of a torsion shaft, a friction plate, a brake pad, a disc-shaped elastic member, an adjustment positioning ring and a positioning screw ring. The torsion shaft is internally provided. An axial through groove, the front end is formed into a card groove, the outer ring is formed with a screw segment, and an axially deep positioning hole is formed, and the rear end has a ring wall; the friction plate is a ring with a frictional surface a sheet body; the brake pad is an annular sheet body formed by the material, and the inner edge has a positioning convex body; the disc-shaped elastic member is concave And having a compression elasticity; the outer ring of the adjustment positioning ring has a plurality of positioning pieces which are selected to be deflected toward the positioning screw; the positioning screw has a shaft hole with a reverse internal thread, and the outer ring There are a plurality of positioning grooves arranged symmetrically for the selected positioning screw to be deflected and rested; when assembled, the torque shaft passes through the friction plate and the perforation of the inner cover, so that the friction plate is attached Attaching the ring wall of the torsion shaft, the through hole of the torsion shaft is sleeved outside the long shaft, so that the end of the long shaft is inserted into the card slot of the torsion shaft for adhesive engagement, and then the inner casing is The brake pad is sleeved on the torsion shaft, so that the positioning protrusion of the brake pad enters the positioning hole of the torsion axis, and the disc-shaped elastic member, the adjustment positioning ring and the positioning screw ring are sequentially sleeved on The shaft of the torque screw is screwed onto the screw shaft of the torque shaft until the torque shaft, the friction plate, the inner cover, the brake pad, the disk elastic member, and the positioning ring are tightened. And positioning the screw ring, and then adjusting the positioning piece of the positioning ring to the positioning screw ring Partial redeem the positioning groove.