Rotating speed and torque conversion equipment with reverse braking function

Abstract

The invention is applicable to the technical field of transmission devices, and provides a rotating speed and torque conversion device with a reverse braking function, which comprises a transmission main body, an output shaft and an input shaft are respectively arranged at two ends of the transmission main body, the input shaft is connected with an external power source through a power shaft, fixed teeth are fixed on the input shaft or the power shaft, and the fixed teeth are fixed on the transmission main body. A clutch device is arranged on the power shaft, the output end of the clutch device is connected with movable teeth, the movable teeth are arranged on the other side, opposite to the fixed teeth, of the input shaft or the power shaft, and the clutch device can push the movable teeth to be connected with the fixed teeth in a clamped mode to achieve transmission. When the movable teeth are separated from the fixed teeth, a clearance is reserved between the movable teeth and the fixed teeth, the problem that the movable clamping device is prone to being abraded when being in a connected state all the time is solved, the clutch device automatically controls clamping and separation of the movable teeth and the fixed teeth through rotation of the shaft body, reverse braking is achieved, meanwhile, abrasion is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission devices, and more particularly to a speed torque conversion device with a reverse braking function. Background Art

[0002] Speed ​​torque conversion equipment is a transmission device that realizes the conversion of speed and torque through gears and other mechanisms. It is widely used in food, light industry, electricity, construction, machinery and other industries. One end of the speed torque conversion equipment is the power source and the other end is the output device. During the actual operation, the equipment may accidentally reverse, resulting in impact, equipment damage or casualties. Therefore, it is necessary to add a reverse braking function to the speed torque conversion equipment.

[0003] At present, the reverse braking function in the prior art adopts a linked shaft holding mechanism. When the sensor detects that the input shaft or the output shaft is abnormal, it can control the shaft holding mechanism to clamp the input shaft, and prevent the transmission device from reversing through forced braking. However, the installation space required for the shaft holding mechanism is large, which increases the overall size of the transmission device. At the same time, it realizes input shaft braking through friction force, which will generate large friction and temperature rise on the shaft body, which is easy to damage the shaft body in long-term use, affecting the service life of the device;

[0004] In addition, a slidable axle pin is arranged on the shaft body, and a wedge-shaped keyway is arranged in the shaft sleeve. When the transmission device is working normally, the axle pin is pushed out and engaged with the wedge-shaped keyway, and transmission is achieved by pushing the side of the keyway. When the input shaft is reversed or the output shaft rotates under the inertia force, the axle pin slides out from the tip on the other side of the keyway, that is, the shaft body and the shaft sleeve become movably connected, thereby achieving the blocking of power transmission and controlling the overall size. However, when reversing, the axle pin always slides against the inner wall of the shaft sleeve, which can easily cause the axle pin or the inner wall of the shaft sleeve to wear, thereby reducing the torque that can be carried and affecting the transmission during normal operation. Its overall life is relatively low. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a speed torque conversion device with a reverse braking function which can automatically block transmission in the event of an abnormality and has a long service life and is not prone to damage.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A speed torque conversion device with a reverse braking function comprises a transmission body, wherein the two ends of the transmission body are respectively an output shaft and an input shaft, the input shaft is connected to an external power source through a power shaft, fixed teeth are fixed on the input shaft or the power shaft, the fixed teeth are wedge-shaped teeth arranged around the end surface of the shaft body, a clutch device is arranged on the power shaft, the output end of the clutch device is connected with movable teeth, the movable teeth are arranged on the input shaft or the power shaft on the other side opposite to the fixed teeth, the extending direction of the wedge-shaped teeth on the power shaft from the tip to the right angle surface is the same as the positive rotation direction of the power shaft, the clutch device can push the movable teeth to engage with the fixed teeth to realize transmission, and when the movable teeth are separated from the fixed teeth, there is a clearance between the two;

[0008] When the external power source works normally, the power shaft rotates in the positive direction, pushing the clutch device, so that the movable teeth move toward the fixed teeth until they are engaged, and the torque is transmitted by the tooth side of the wedge-shaped teeth, thereby realizing transmission, and the transmission body normally transmits power to the output end;

[0009] When the external power source reverses, the torque is transmitted through the wedge-shaped surfaces of the movable teeth and the fixed teeth, and the clutch device is driven in the opposite direction, so that the movable teeth move away from the fixed teeth under the joint action of the clutch device and the torque, so that the two are not in contact, the power cannot be transmitted to the transmission body, and the output end will not reverse, which ensures the safety of the equipment, avoids friction at the connection, and prolongs the service life;

[0010] When the external power source stops and the output shaft continues to rotate under the action of inertia, the torque is transmitted from the input shaft to the power shaft through the wedge-shaped surfaces of the movable teeth and the fixed teeth. Under the action of the torque, the movable teeth move away from the fixed teeth until the two are out of contact. The power cannot be transmitted to the power source, which can prevent the power source from being damaged, avoid friction at the connection, and extend the service life.

[0011] The present invention is further configured as follows: the clutch device includes a plurality of slide grooves, the slide grooves are opened on the power shaft, the slide grooves are arranged along the inclined direction, and the plurality of slide grooves are evenly distributed along the circumference of the power shaft. A push rod is slidably connected in the slide groove. When the shaft body rotates, the inertia force and the thrust of the slide groove can drive the push rod to slide along the slide groove, thereby driving the movable teeth to move axially along the power shaft, thereby realizing the mutual engagement or disengagement of the teeth at both ends.

[0012] In one embodiment, the fixed teeth are fixed on the input shaft, the chute extends toward the input shaft side along the direction opposite to the reverse rotation of the power shaft, a sliding sleeve is fixedly arranged on a plurality of the push rods together, the sliding sleeve is movably sleeved on the power shaft, the movable teeth are fixed on the end face of the sliding sleeve, when the input shaft rotates, the sliding sleeve can be driven to move axially through the chute, so that the movable teeth and the fixed teeth are engaged or disengaged with each other to realize the function;

[0013] The present invention is further arranged as: the movable teeth are wedge-shaped teeth that can be engaged with the fixed teeth, the tooth tops and tooth bottoms of the movable teeth and the fixed teeth are both arc-shaped, when the movable teeth and the fixed teeth are engaged, the corresponding arc-shaped surfaces are attached to each other, which is convenient for the teeth at both ends to be engaged with each other, reduces the impact force during engagement, reduces the stress on the engagement surface, and reduces the wear of the teeth.

[0014] In another embodiment, the fixed teeth are fixed on the power shaft, the chute extends toward the input shaft side along the direction of the forward rotation of the power shaft, one end of the input shaft facing the power shaft is arranged in a cylindrical shape, one end of the power shaft provided with the chute extends into the cylinder of the input shaft, an annular idle groove is circumferentially arranged in the cylinder of the input shaft, a plurality of limiting grooves are symmetrically arranged axially on the input shaft, the limiting grooves are communicated with the idle groove, a push block is arranged at one end of the push rod extending out of the power shaft, the push block is slidably connected with the limiting groove and the idle groove, the movable teeth are arranged on the end face of the input shaft, when the power shaft rotates forward, the chute drives the push rod to move toward the power shaft side, so that the push block enters the limiting groove, and the push block moves along the limiting groove, which can push the movable teeth and the fixed teeth to be engaged;

[0015] The present invention is further arranged as: the movable teeth are a plurality of elastic metal thick sheets, one end of the metal thick sheet is fixed on the end face of the input shaft and the other end is a free end, the free end presses on the opening of the limiting groove, when the power shaft rotates, the push rod moves along the chute, driving the push block to move toward or away from the power shaft, when the push block is pushed out, the free end is pushed to be engaged with the side end of the fixed teeth to realize torque transmission, and when the push block is retracted, the free end relaxes and retracts to be attached to the end face of the input shaft under the action of its own elastic force to block torque transmission.

[0016] It is further arranged as: when the movable teeth and the fixed teeth are engaged, the end face of the free end and the side face of the push block are simultaneously attached to the corresponding tooth end face of the fixed teeth, when transmitting torque, under the limitation of the fixed teeth, the input shaft end face, the push block and the corresponding movable teeth form a triangular structure, which improves the torque bearing capacity.

[0017] The advantages of the present invention are:

[0018] 1. A clutch device is provided, with movable teeth and fixed teeth at both ends. The clutch device is controlled by a plurality of slide grooves arranged obliquely on the power shaft. When the power source rotates forward, the movable teeth move toward the fixed teeth and engage with each other, thereby realizing torque transmission. When the power source rotates reversely or stops and the output shaft continues to rotate under the action of inertia, the movable teeth are pushed away from the fixed teeth by the slide groove, thereby blocking the torque transmission and ensuring the safety of the equipment.

[0019] 2. The fixed teeth are set as wedge-shaped teeth and fixed on the end face of the shaft body. The side face of the teeth on the same side as the power shaft is set in the direction of the positive rotation of the power shaft, so that the teeth are engaged and the torque can be stably transmitted when the power source is working normally. When the power source is reversed or stopped, the movable teeth are pushed away by the torque on the wedge surface. The inclined slide groove improves the efficiency of the engagement or disengagement of the movable teeth and the fixed teeth.

[0020] 3. When the fixed teeth and the movable teeth are separated, there is a gap in the middle. When the transmission is blocked, the teeth at both ends do not contact each other, thus avoiding wear and tear and increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0022] Figure 2 For along Figure 1 The AA line section is shown;

[0023] Figure 3 for Figure 1 An enlarged view of part B is shown;

[0024] Figure 4 It is a structural schematic diagram of the clutch device in the disengaged state according to the first embodiment of the present invention;

[0025] Figure 5 for Figure 4 The front view shown;

[0026] Figure 6 for Figure 4 Schematic diagram of the decomposition structure;

[0027] Figure 7 It is a schematic structural diagram of a clutch device according to a second embodiment of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the clutch device in the disengaged state according to the second embodiment of the present invention;

[0029] Figure 9 for Figure 8 Schematic diagram of the decomposition structure;

[0030] Figure 10This is a schematic diagram of the structure of the input shaft of the second embodiment of the present invention;

[0031] In the figure: 1. Transmission body; 2. Output shaft; 3. Input shaft; 4. Power shaft; 5. Clutch device; 51. Sleeve; 52. Push rod; 53. Slide groove; 54. Push block; 55. Limiting groove; 56. Idle groove; 6. Fixed teeth; 7. Movable teeth; 8. Clearance. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] See also Figures 1-6 , the present invention provides the following technical solutions:

[0034] A speed torque conversion device with a reverse braking function comprises a transmission body 1, wherein the two ends of the transmission body 1 are respectively an output shaft 2 and an input shaft 3, the input shaft 3 is connected to an external power source through a power shaft 4, a fixed tooth 6 is fixed on the input shaft 3, a clutch device 5 is arranged on the power shaft 4, and a movable tooth 7 is connected to the output end of the clutch device 5, the fixed tooth 6 and the movable tooth 7 are both wedge-shaped teeth arranged around the end surface of the shaft body, the movable tooth 7 is arranged on the power shaft 4, and the extending direction of the movable tooth 7 from the tip to the right angle surface is in the positive rotation direction of the power shaft 4 In the same direction, when the power shaft 4 rotates forward, the clutch device 5 can push the movable teeth 7 to engage with the fixed teeth 6 to realize transmission. When the power shaft 4 is reversed or the power shaft 4 is stopped and the output shaft 2 continues to rotate under the drive of inertia, the clutch device 5 cooperates with the wedge-shaped surface of the wedge-shaped teeth to jointly push the movable teeth 7 to disengage from the fixed teeth 6, thereby blocking the transmission of torque. When the movable teeth 7 are separated from the fixed teeth 6, there is a clearance 8 between the two, and the teeth at both ends do not contact each other, thereby avoiding the occurrence of wear, thereby realizing the reverse stopping function and extending the overall service life.

[0035] The clutch device 5 includes a plurality of slide grooves 53, which are provided on the power shaft 4, and extend toward the input shaft 3 in a direction opposite to the rotation direction of the power shaft 4. The plurality of slide grooves 53 are evenly distributed along the circumference of the power shaft 4, and push rods 52 are slidably connected in the slide grooves 53. A sliding sleeve 51 is fixed to the plurality of push rods 52, and the sliding sleeve 51 is movably sleeved on the power shaft 4, and the movable teeth 7 are fixed to the end surface of the sliding sleeve 51.

[0036] When the power shaft 4 rotates forward, under the inertial force of the sliding sleeve 51 and the thrust of the sliding groove 53, the push rod 52 moves in the sliding groove 53 toward the side of the input shaft 3 until the push rod 52 moves to the end of the right side of the sliding groove 53. The sliding sleeve 51 rotates synchronously with the power shaft 4 driven by the push rod 52. At the same time, the sliding sleeve 51 is driven by the push rod 52 to move to the right side until the movable teeth 7 are engaged with the fixed teeth 6. The tooth side surface of the movable teeth 7 pushes the fixed teeth 6 to rotate synchronously, that is, the input shaft 3 rotates synchronously with the power shaft 4, and the torque can be transmitted normally.

[0037] When the power shaft 4 is accidentally reversed, the push rod 52 moves to the left in the slide groove 53 under the inertial force of the sliding sleeve 51 and the transmission body 1 and the thrust of the slide groove 53 until the push rod 52 moves to the end of the left side of the slide groove 53. The sliding sleeve 51 rotates synchronously with the power shaft 4 under the drive of the push rod 52, and the movable teeth 7 are driven to disengage from the fixed teeth 6, so that the torque on the power shaft 4 cannot be transmitted to the input shaft 3, thereby avoiding the reversal of the output end and ensuring safety.

[0038] When the power shaft 4 is stopped and the output shaft 2 continues to rotate under the action of inertia, the input shaft 3 maintains forward rotation. At this time, the torque acts on the movable teeth 7 through the wedge-shaped surface of the fixed teeth 6, pushing the movable teeth 7 to the left. The movable teeth 7 are pushed and rotated along the slide groove 53 through a certain angle and then disengaged from the fixed teeth 6, that is, the torque cannot be transmitted to the power shaft 4, thereby avoiding damage to the power source caused by forced rotation.

[0039] Furthermore, the tooth tops and tooth bottoms of the movable teeth 7 and the fixed teeth 6 are both arranged to be arc-shaped. When the movable teeth 7 are engaged with the fixed teeth 6, the corresponding arc-shaped surfaces fit together. Through the setting of the arc-shaped surfaces, it is convenient for the teeth at both ends of the movable teeth 7 to be engaged when they move. At the same time, the impact on the tooth tops and tooth bottoms during engagement is reduced, the stress on the engaging surfaces is reduced, the wear of the teeth is reduced, and the transmission is ensured to be smooth while extending the overall service life.

[0040] Please participate Figures 7-10 , the second embodiment of the present invention is as follows:

[0041] A speed torque conversion device with a reverse braking function comprises a transmission body 1, wherein the two ends of the transmission body 1 are respectively an output shaft 2 and an input shaft 3, the input shaft 3 is connected to an external power source via a power shaft 4, a fixed tooth 6 is fixed on the power shaft 4, the fixed tooth 6 is a wedge-shaped tooth arranged around the end face of the power shaft 4, the extension direction of the fixed tooth 6 from the tip to the right angle surface is the same as the positive rotation direction of the power shaft 4, a clutch device 5 is arranged on the power shaft 4, the output end of the clutch device 5 is connected to a movable tooth 7, the movable tooth 7 is arranged on the input shaft 3, the clutch device 5 can push the movable tooth 7 to engage with the fixed tooth 6 to realize transmission, and when the movable tooth 7 is separated from the fixed tooth 6, there is a clearance 8 between the two.

[0042] The clutch device 5 includes a plurality of slide grooves 53, which are provided on the power shaft 4. The slide grooves 53 extend toward the input shaft 3 along the direction of positive rotation of the power shaft 4. The plurality of slide grooves 53 are evenly distributed along the circumference of the power shaft 4. The slide grooves 53 are provided on the right side of the fixed teeth 6. The left end of the input shaft 3 is provided in a cylindrical shape. One end of the power shaft 4 provided with the slide grooves 53 extends into the cylinder of the input shaft 3.

[0043] A push rod 52 is slidably connected in the slide groove 53, and a push block 54 is provided at one end of the push rod 52 extending out of the power shaft 4. An idling groove 56 is circumferentially provided on the inner side of the cylinder of the input shaft 3. The idling groove 56 is annular. A plurality of limiting grooves 55 are symmetrically provided on the input shaft 3 along the axial direction. The limiting grooves 55 are connected to the idling grooves 56. The push block 54 is slidably connected to the limiting grooves 55 and the idling grooves 56.

[0044] The movable teeth 7 are a plurality of elastic metal thick sheets, one end of which is fixed to the end face of the input shaft 3 and the other end is a free end. The free end cover is pressed on the opening of the limiting groove 55, and the push block 54 can push the free end to engage with the fixed teeth 6.

[0045] When the power shaft 4 rotates forward, the push rod 52 is driven to move to the left along the slide groove 53, thereby driving the push block 54 to enter the limit groove 55. After entering the limit groove 55, the push block 54 can only continue to move to the left along the limit groove 55, so that the push rod 52 moves synchronously until it reaches the leftmost end of the slide groove 53. The push rod 52 rotates synchronously with the power shaft 4 under the push of the bottom of the slide groove 53. At this time, the push block 54 drives the free end of the movable tooth 7 to rotate to the left. The free end of the movable tooth 7 is engaged with the tooth side surface of the fixed tooth 6. The fixed tooth 6 can push the input shaft 3 to rotate synchronously through the movable tooth 7, thereby realizing transmission.

[0046] When the power shaft 4 is accidentally reversed, the push rod 52 is driven by the slide groove 53 to move to the right, and the push block 54 enters the idle groove 56 along the limit groove 55. At the same time, the movable tooth 7 is reset and separated from the fixed tooth 6 until the push rod 52 reaches the rightmost end of the slide groove 53. At this time, the movable tooth 7 is not in contact with the fixed tooth 6. The power shaft 4 drives the push block 54 to rotate in the idle groove 56 through the slide groove 53. The torque on the power shaft 4 cannot be transmitted to the input shaft 3, ensuring that the output end will not be reversed;

[0047] When the power shaft 4 is stopped and the output shaft 2 continues to rotate under the action of inertia, the input shaft 3 maintains forward rotation, and the limit groove 55 drives the push block 54 to rotate, so that the push rod 52 moves to the right along the slide groove 53 until the push block 54 enters the idle groove 56. At this time, when the input shaft 3 continues to rotate, the idle groove 56 does not generate torque on the push block 54, and the idle groove 56 rotates on the push block 54, that is, the torque on the input shaft 3 cannot be transmitted to the power shaft 4 through the push block 54, thereby avoiding damage to the power source caused by forced rotation.

[0048] Furthermore, when the movable teeth 7 are engaged with the fixed teeth 6, the end face of the free end and the side face of the push block 54 are simultaneously in contact with the tooth end face corresponding to the fixed teeth 6. When transmitting torque, under the limiting action of the fixed teeth 6, the end face of the input shaft 3, the push block 54 and the corresponding movable teeth 7 together form a triangular structure, thereby improving the ability to bear torque.

[0049] In summary, the present invention is provided with a clutch device 5, the two ends of the clutch device 5 are respectively movable teeth 7 and fixed teeth 6, and the clutch device 4 is controlled by a plurality of slide grooves 53 obliquely arranged on the power shaft 3. When the power source rotates forward, the movable teeth 7 move toward the fixed teeth 6 and engage with each other, thereby realizing torque transmission. When the power source is reversed or the power source is stopped and the output shaft 2 continues to rotate under the action of inertia, the movable teeth 7 are pushed away from the fixed teeth 6 by the slide grooves 53, thereby blocking the torque transmission and ensuring the safety of the equipment.

[0050] The fixed teeth 6 are configured as wedge-shaped teeth and fixed on the end face of the shaft body. The side face of the teeth on the same side as the power shaft 4 is configured in the direction of the positive rotation of the power shaft 4, so that the teeth are engaged and the torque can be stably transmitted when the power source is working normally. When the power source is reversed or stopped, the movable teeth 7 are pushed away by the torque on the wedge-shaped surface, and the inclined slide groove 53 is used to improve the efficiency of the engagement or disengagement of the movable teeth 7 and the fixed teeth 6.

[0051] When the fixed teeth 6 and the movable teeth 7 are separated, a gap is left in the middle. When the transmission is blocked, the teeth at both ends do not contact each other, thereby avoiding wear and tear and increasing the service life of the equipment.

[0052] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

Claims

1. A speed torque conversion device with a reverse braking function, comprising a transmission body (1), wherein two ends of the transmission body (1) are an output shaft (2) and an input shaft (3), respectively, and characterized in that: The input shaft (3) is connected to an external power source via a power shaft (4); a fixed tooth (6) is fixed on the input shaft (3) or the power shaft (4); the fixed tooth (6) is a wedge-shaped tooth arranged around the end surface of the shaft body; a clutch device (5) is arranged on the power shaft (4); an output end of the clutch device (5) is connected to a movable tooth (7); the movable tooth (7) is arranged on the input shaft (3) or the power shaft (4) on the other side opposite to the fixed tooth (6); the extending direction of the wedge-shaped tooth on the power shaft (4) from the tip to the right angle surface is the same as the positive rotation direction of the power shaft (4); the clutch device (5) can push the movable tooth (7) to engage with the fixed tooth (6) to realize transmission; when the movable tooth (7) is separated from the fixed tooth (6), there is a clearance (8) between the two.

2. The speed torque conversion device with reverse braking function according to claim 1, characterized in that: The clutch device (5) comprises a plurality of slide grooves (53), wherein the slide grooves (53) are provided on the power shaft (4), the slide grooves (53) are arranged along an inclined direction, and the plurality of slide grooves (53) are evenly distributed along the circumference of the power shaft (4). A push rod (52) is slidably connected in the slide groove (53), and when the push rod (52) slides along the slide groove (53), it can drive the movable tooth (7) to move axially along the power shaft (4).

3. The speed torque conversion device with reverse braking function according to claim 2, characterized in that: The fixed teeth (6) are fixed on the input shaft (3), the slide groove (53) extends toward one side of the input shaft (3) in a direction of rotation opposite to the power shaft (4), a sliding sleeve (51) is fixed on a plurality of the push rods (52), the sliding sleeve (51) is movably sleeved on the power shaft (4), and the movable teeth (7) are fixed on an end surface of the sliding sleeve (51).

4. The speed torque conversion device with reverse braking function according to claim 3, characterized in that: The movable teeth (7) are wedge-shaped teeth that can engage with the fixed teeth (6); the tops and bottoms of the movable teeth (7) and the fixed teeth (6) are both arranged in an arc shape; when the movable teeth (7) and the fixed teeth (6) are engaged, the corresponding arc surfaces fit in contact with each other.

5. The speed torque conversion device with reverse braking function according to claim 2, characterized in that: The fixed teeth (6) are fixed on the power shaft (4); the slide groove (53) extends toward one side of the input shaft (3) in the direction of positive rotation of the power shaft (4); the end of the input shaft (3) facing the power shaft (4) is arranged in a cylindrical shape; the end of the power shaft (4) provided with the slide groove (53) extends into the cylinder of the input shaft (3); the cylinder of the input shaft (3) is provided with an annular idle groove (56) along the circumferential direction; a plurality of limit grooves (55) are symmetrically provided on the input shaft (3) along the axial direction; the limit grooves (55) are connected with the idle grooves (56); a push block (54) is provided at one end of the push rod (52) extending out of the power shaft (4); the push block (54) is slidably connected with the limit groove (55) and the idle groove (56); the movable teeth (7) are arranged on the end surface of the input shaft (3); the push block (54) can push the movable teeth (7) to engage with the fixed teeth (6).

6. The speed torque conversion device with reverse braking function according to claim 5, characterized in that: The movable teeth (7) are a plurality of elastic metal thick sheets, one end of the metal thick sheet is fixed to the end surface of the input shaft (3), and the other end is a free end. The free end cover is pressed on the opening of the limiting groove (55), and the push block (54) can push the free end to engage with the fixed teeth (6).

7. The speed torque conversion device with reverse braking function according to claim 6, characterized in that: When the movable teeth (7) are engaged with the fixed teeth (6), the end surface of the free end and the side surface of the push block (54) are simultaneously in contact with the tooth end surface corresponding to the fixed teeth (6).

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