TWM639192U - Torque-limiting device - Google Patents

Abstract

The present invention provides a torque limiting device, which includes an input piece, an output piece and a torque limiting piece. The output member is pivotally connected to the input member; the torque limiting member is passed through the input member and the output member, the input member and the output member pivot around a pivot shaft, the torque limiting member and the pivot shaft are arranged at intervals, and the input member and the output member are selectively Destruction of the torque limiting member, that is, when the torque is too large, the input part and the output part will destroy the torque limiting member.

Description

torque limiting device

The present invention provides a torque limiting device, and in particular relates to a torque limiting device that can reduce human variability and improve the efficiency of installing or dismounting mechanical components.

The principle of leverage is a mechanical principle widely used in many torsion elements. Generally speaking, when a user wants to rotate a mechanical component with a specific size, an external force can be applied to a force-applying arm according to actual needs, and the mechanical component to be rotated is arranged on the force-resisting arm. By adjusting the force The length of the arm or the resistance arm amplifies or reduces the torque caused by the external force to achieve the effect of labor saving or time saving. Taking the field of firefighting as an example, firefighters can use a manual wrench or an automatic wrench to lock the bolt head outside the fire sprinkler head, and provide power to rotate the bolt manually or automatically to install or remove the fire sprinkler head.

Although the existing code of practice stipulates that construction personnel should install or disassemble according to the set torque value, neither manual wrench nor automatic wrench can ensure that the actual construction torque meets the specification, so there are often fire sprinklers due to excessive torque. A condition in which water leakage occurs due to deformation of the internal components of the water head. For this reason, some manufacturers have developed tools such as adjustable torque wrench and torque sleeve to solve the above problems. When the applied torque is greater than the set value, the internal mechanism of the adjustable torque wrench and torque sleeve will jump off and stop. Torque transmission. However, in order to complete the construction work as soon as possible, some construction workers will continue to use the above-mentioned internal mechanism after it has been restored after it has jumped out, thus losing the meaning of torque limitation. In addition, because the fire sprinkler head needs to be installed in various environments, and the adjustable torque wrench and torque sleeve have many limitations in terms of storage and carrying, installation speed, and cost considerations, it is difficult to become a torque limiting component commonly used in fire sprinkler heads .

The creators exhausted their brains and researched carefully, and then developed a torque limiting device that can prevent torque transmission when the torque is too large, in order to achieve the effect of reducing human variables and improving the efficiency of installing or disassembling mechanical components.

The present invention provides a torque limiting device, which includes an input piece, an output piece and a torque limiting piece. The output member is pivotally connected to the input member; the torque limiting member is passed through the input member and the output member, the input member and the output member pivot around a pivot shaft, the torque limiting member and the pivot shaft are arranged at intervals, and the input member and the output member are selectively Break the torque limiter.

In one embodiment, the torque limiting device further includes a stopper, and the stopper passes through the input part and the output part. In addition, one of the input member and the output member includes at least one catch portion, and the stopper is adapted to abut against the catch portion after the torque limiting member is broken.

In one embodiment, one of the input member and the output member is formed with a catch groove, at least a part of the stopper is accommodated in the catch groove, and the catch part is the catch groove in the pivoting direction two opposite side walls.

In one embodiment, the above-mentioned input member and the output member are respectively cylindrical, and the catch groove is formed on the peripheral surface of one of the input member and the output member, and an arc formed between the side walls of the peripheral surface is opposite to each other. The central angle of the pivot axis is 25-45 degrees.

In one embodiment, the above-mentioned input member and the output member are respectively formed with a shearing portion. When the torque limiting device is in a continuous configuration, the shearing portions are aligned with each other, and at least a part of the torque limiting member is accommodated in the In each shearing portion, and the distances between these side walls and the stopper are substantially equal.

In one embodiment, the torque limiting device further includes a positioning piece, the other of the input piece and the output piece forms a stopper holding portion and a positioning piece holding portion, and a part of the stopper abuts against the stopper The holding part of the positioning part communicates with the holding part of the stopper, and the positioning part abuts against the stopper.

In one embodiment, the torque limiting device further includes at least one retainer, the input member and the output member respectively form a shearing portion, and at least one of the input member and the output member forms a holder accommodating portion. At least a part of the torque limiter abuts against each shearing portion, and the holder accommodating portion communicates with the corresponding shearing portion, and the holder holds the torque limiting member and passes through the holder accommodating portion.

In one embodiment, the holder includes a fixed part and a movable part, the fixed part is arranged in the holder accommodating part, the movable part is arranged in the corresponding shear part and is movably connected to the fixed part, and the holder passes through the movable part Selectively abuts against the torque limiter.

In one embodiment, the torque limiting device further includes a connecting piece, the connecting piece abuts against the input piece and the output piece, and the pivot shaft passes through the connecting piece.

In one embodiment, one of the input member and the output member includes a shaft portion on which a connecting member holding portion is formed, and the other of the input member and the output member is formed with a shaft hole, and the shaft portion passes through the shaft. A part of the connecting part is arranged in the holding part of the connecting part, and the other part of the connecting part abuts against the other one of the input part and the output part.

In this way, when the torque limiting device of the present invention is smaller than the set value, the torque limiting part can drive the output part to rotate synchronously when the input part receives external torque; and when the torque is greater than the set value, the input part and the output part will be damaged The torque limiter releases the interlocking relationship, and the user needs to replace the new torque limiter to work again, thereby achieving the effect of reducing human variables and improving the efficiency of installing or removing mechanical components.

In order to make the above-mentioned features and advantages of the new creation more obvious and easy to understand, the following specific examples are given together with the attached drawings for detailed description as follows.

The aforementioned and other technical contents, features and effects of the new creation will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. It is worth mentioning that the directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms used are illustrative rather than limiting of the novel creation. In addition, in the following embodiments, the same or similar elements will use the same or similar symbols.

Please refer to Fig. 1 and Fig. 2, wherein Fig. 1 is a three-dimensional schematic diagram of an embodiment of the torque limiting device of the present invention in cooperation with a hand tool, and Fig. 2 is an exploded view of an embodiment of the torque limiting device of the present invention schematic diagram. The torque limiting device 1 of this embodiment can be applied to components such as fire sprinkler heads, water pumps, or construction related components, to transmit and limit the torque output to the above components, and the torque limiting device 1 includes an input part 100, an output 200 and a torque limiting member 300, wherein the output member 200 is pivotally connected to the input member 100; the torque limiting member 300 passes through the input member 100 and the output member 200, and the input member 100 and the output member 200 selectively destroy the torque limiting member 300.

As shown in Figures 1 and 2, the input member 100 may include an input portion 110, wherein the shape and size of the input portion 110 correspond to the shape and size of the opening of a hand tool 2 as a source of torque input, and the hand tool 2 may be A manual wrench or an automatic wrench, but this new creation is not limited. In addition, the output member 200 may include an output portion 210, wherein the shape and size of the output portion 210 correspond to the shape and size of the object to transmit torque, where the object to transmit torque is, for example, a nut of a fire sprinkler head (not shown ), and the output part 210 is suitable for fitting in the hole of the nut, but this new creation does not limit the type of the object to be transmitted and the actual combination of the output part 210 and the object to be transmitted.

Please refer to Fig. 1 to Fig. 5 together, and especially Fig. 2, Fig. 4 and Fig. 5, wherein Fig. 3 is a schematic front view of an embodiment of the torque limiting device created by the present invention in a linked configuration, and Fig. 4 is A schematic top view of some components of an embodiment of the torque limiting device of the present invention, and FIG. 5 is a schematic top view of another part of the components of the torque limiting device of FIG. 4 . As shown in FIG. 2 , the input member 100 and the output member 200 can pivot around a pivot axis A, and the torque limiting member 300 is spaced apart from the pivot axis A. As shown in FIG.

In detail, the output member 200 can include a shaft portion 220, and the input member 100 can be formed with a shaft hole 150, and the shaft portion 220 can pass through the shaft hole 150, so the input member 100 and the output member 200 can rotate around the same pivot axis A pivot. In addition, the torque limiting member 300 is, for example, a rod, the input member 100 may be formed with at least one shearing portion 180, and the output member 200 may be formed with at least one shearing portion 280, wherein the shearing portion 180 and the shearing portion 280 are, for example, Each is a through hole. In this embodiment, the number of the shearing portion 180 and the shearing portion 280 are, for example, two. The element 300 passes through the input element 100 and the output element 200 through the shearing portion 180 and the shearing portion 280 on one side. Thus, when the torque limiting device 1 is in a continuous configuration, the shearing portion 180 and the shearing portion 280 are aligned with each other, and at least a part of the torque limiting member 300 is accommodated in the shearing portion 180 and the shearing portion 280 And abut against the side walls of the shearing portion 180 and the shearing portion 280, so the torque limiting member 300 can drive the output member 200 to pivot synchronously when the input member 100 receives external torque, so when the input member 100 receives the external torque through the input part 110 After the torque is applied to the hand tool 2, the torque can be transmitted to the output member 200, and then transmitted to the object to transmit the torque through the output part 210, so as to achieve the effect of torque transmission. It is also possible to combine the two through the way that the input member 100 includes a shaft portion and the output member 200 is formed with a shaft hole, and the torque limiting member 300 can also be arranged in the shearing portion 180 and the shearing portion 280 on both sides at the same time. New creations are not limited to this.

Please refer to FIG. 1 to FIG. 6 together, and especially FIG. 2 , FIG. 5 and FIG. 6 , wherein FIG. 6 is a schematic cross-sectional view of the torque limiting device in FIG. 3 . In one embodiment, the torque limiting device 1 may further include a connecting member 500 , wherein the connecting member 500 is, for example, a spring pin and abuts against the input member 100 and the output member 200 , and the pivot axis A passes through the connecting member 500 . Specifically, the input part 110 can form a joint part 112, wherein the joint part 112 communicates with the shaft hole 150; in addition, a connecting part holding part 222 is formed on the shaft part 220, wherein the connecting part holding part 222 is, for example, a through hole or a slot. After the input part 100 and the output part 200 are assembled, a part of the shaft part 220 can be accommodated in the joint part 112, a part of the connecting part 500 can be arranged in the connecting part holding part 222, and the part of the connecting part 500 The other part can abut against the inner wall of the joint part 112 of the input member 100 . In this way, when the torque limiting device 1 is in the above-mentioned interlocking configuration or the disconnected configuration described below, the connecting member 500 can be locked on the input member 100 and the output member 200 at the same time, and preferably through the spring The elastic force of the pin is assisted so that the input member 100 and the output member 200 are fastened to each other in the extension direction of the pivot axis A (hereinafter referred to as the axial direction) without being disengaged from each other, and since the pivot axis A passes through the connecting member 500, the connection The element 500 will not release the above-mentioned locking relationship due to the relative pivoting of the input element 100 and the output element 200 and other components interfering with each other, thus ensuring safety during use.

It is worth mentioning that although the hand tool 2 is an open-end wrench in this embodiment, and the external shape and size of the input part 110 correspond to the hand tool 2 as an example, the present invention is not limited thereto. For example, when the hand tool 2 is a torque wrench without an opening, the user can also lock the torque output part of the hand tool 2 into the joint part 112, and through the tight fit between the hand tool 2 and the joint part 112 The linkage drives the input member 100 to rotate. In other words, the input member 100 of this embodiment can correspond to both an open-end wrench and a wrench without an open end, so it can be applied to a variety of different hand tools.

Furthermore, in one embodiment, the input portion 110 can also be formed with at least one through hole 114. In the embodiment shown in FIG. 2 and FIG. on both sides. In this way, after the input element 100 and the output element 200 are assembled, the user can directly pass the connecting element 500 through the through hole 114 and pass through the connecting element holding portion 222 , which makes it more convenient to assemble the connecting element 500 .

Please refer to Fig. 7 and Fig. 8, wherein Fig. 7 is a schematic front view when a hand tool applies excessive torque to an embodiment of the torque limiting device of the present invention along a direction of rotation, and Fig. 8 is a schematic view of the torque limiting device of the present invention A schematic cross-sectional view of an embodiment in an off configuration. When the user applies excessive torque to the torque limiting device 1 through the hand tool 2 in the direction of the arrow in FIG. shear strength, and together with the shearing portion 280 destroys the torque limiter 300 and shears it into a first portion 310 and a second portion 320, wherein the first portion 310 is accommodated in the shearing portion 180, The second part 320 is accommodated in the cutting part 280 , and the first part 310 and the second part 320 are independent from each other. In this way, the input member 100 and the output member 200 can release the interlocking relationship, and the object to transmit the torque will not be damaged or deformed by the excessive torque, so as to be protected, and if the user wants to work again, he needs to replace it with a new torque Only the restricting member 300 can restore the interlocking relationship between the input member 100 and the output member 200 in the pivoting direction, thereby reducing man-made variables and improving the efficiency of installing or removing mechanical components.

Please refer to Fig. 1 to Fig. 8 again, and especially Fig. 2, Fig. 3, Fig. 6 and Fig. 8, in one embodiment, the torque limiting device 1 may also include at least one holder 700, in this embodiment the holder The number of 700 is two, and they are disposed in the input element 100 and the output element 200 respectively. The holding element 700 disposed in the input element 100 and the output element 200 will be described as the holding element 700a and the holding element 700b respectively in the following. In detail, at least one of the input part 100 and the output part 200 can form a holding part accommodating part. In this embodiment, both the input part 100 and the output part 200 are formed with a holding part accommodating part, wherein each holding part The accommodating portion can be a slotted hole, and the number and position correspond to the shearing portion 180 and the shearing portion 280. Holder accommodating part of the cutting part 280 . The holding part accommodating part 190 and the holding part accommodating part 290 extend along the lateral direction of the input part 100 and the output part 200 respectively and communicate with the shearing part 180 and the cutting part 280, while the holding part 700a and the holding part 700b hold the torque limiting part 300 and respectively pass through the holder accommodating part 190 and the holder accommodating part 290 . In this way, when the user intends to use the torque limiting device 1 again after the torque limiting member 300 is broken, a new torque limiting member 300 can be arranged at the shearing part by adjusting the holding member 700a and/or the holding member 700b 180 and the shearing part 280, or the first part 310 and the second part 320 formed due to excessive torque are moved out of the shearing part 180 and the shearing part 280, so as to achieve the effect of quick replacement of the torque limiter 300 . However, in other possible embodiments, the cutting part 180 and the cutting part 280 can also be a slot respectively, and the user can also use the bottom of the cutting part 180 and the cutting part 280 instead of disposing the holder 700 The holding torque limiter 300 is not limited by the present invention.

Please refer to Figures 1 to 8 again, and especially Figures 2, 4 and 5, in one embodiment, each holder 700 can be a positioning bead and includes a fixed part 710 and a movable part 720, wherein each The fixed part 710 is disposed in the corresponding holder accommodating part 190 and the holder accommodating part 290; each movable part 720 is, for example, a stainless steel ball, which can be arranged in the shearing part 180 and the shearing part as shown in Fig. 4 and Fig. 5 The portion 280 is movably connected to each fixing portion 710 through a spring, for example. When the user wants to put the torque limiting member 300 into the shearing portion 180 and the shearing portion 280 or move the first part 310 and the second part 320 out of the shearing part 180 and the shearing part 280, the user can press the movable part by hand 720, at this time, the torque limiting member 300 will no longer be abutted by the pressed holding member 700, so it can be directly inserted or removed along the other end of the shearing portion 180 or the shearing portion 280; and when the user stops pressing the movable When the part 720 is moved, the movable part 720 will be moved into the shearing part 180 and/or the shearing part 280 again under the action of the spring force and abut against the torque limiter 300 . In other words, the holder 700 can selectively abut against the torque limiting member 300 through the movable portion 720, so the user can save the process of rotating and moving the holder 700 through tools during operation, further improving the convenience of using the torque limiting device 1 sex.

Please refer to FIG. 1 to FIG. 8 again, and especially FIG. 2 to FIG. 5 , since the user may not have a high working environment stability when operating the torque limiting device 1 (such as standing on a ladder), when the torque limiting member 300 When broken due to excessive torsion, the reaction force generated by idling between the input member 100 and the output member 200 due to entering the disconnected configuration is dangerous to the operator. Therefore, in one embodiment, the torque limiting device 1 may further include a stopper 400 , wherein the stopper 400 is, for example, a bar and passes through the input member 100 and the output member 200 . In addition, one of the input member 100 and the output member 200 may include at least one stopper portion. In this embodiment, for example, the output member 200 includes two stopper parts 230, and the stopper 400 is suitable for 300 abuts against the catch portion 230 after being broken.

Specifically, in this embodiment, the input member 100 can also form a stopper holding portion 160, wherein the stopper holding portion 160 is, for example, a through hole that penetrates the input member 100 in the axial direction; in addition, the output member 200 can A locking slot 250 is formed, and the locking portion 230 is two opposite side walls of the locking slot 250 in the pivoting direction. When the input member 100 and the output member 200 are assembled, a part of the stopper 400 is accommodated in the stopper holder 160 and abuts against the side wall of the stopper holder 160, while the other part of the stopper 400 is A part is accommodated in the stop slot 250 and can slide relative to the bottom surface of the stop slot 250 . With such a configuration, when the user applies excessive torque and the torque limiting member 300 breaks, although the input member 100 will idle relative to the output member 200 because it is in the disconnected configuration, it will pass through the stopper while pivoting. The holding part 160 drives the stopper 400 to pivot together, and the stopper 400 will be stopped by the stopper 230 on the right side as shown in FIG. Safety concerns arising from the reaction force generated by the idling of the output member 200 . However, in other possible embodiments, the input member 100 may also be formed with a catch groove and a catch portion, and the stopper 400 is disposed on the stopper holding portion of the output member 200, which is not included in the present invention. limit.

In one embodiment, the shear strength of the torsion limiting member 300 is less than or equal to the shear strength of the stopper 400 . Specifically, in this embodiment, the material of the torsion limiting member 300 is, for example, aluminum, and the material of the stopper 400 is, for example, bearing steel. Since the shear strength of the latter is several times that of the former, the same Under the action of excessive torsion force, when the torque limiter 300 is damaged by the shearing portion 180 and the shearing portion 280, the stopper 400 can withstand the corresponding shearing force without being damaged, thereby ensuring the safety during operation. However, in order to avoid installation troubles for the user, the torque limiter 300 is not configured, and the stopper 400 is only used as the synchronous pivoting limiting element of the input member 100 and the output member 200. The torque limiter 300 and the stopper 400 Aluminum can also be selected as the material, that is, the shear strength of the torsion limiting member 300 can be equal to that of the stopper 400 . In addition, in other possible embodiments, the user can also select the torque limiter 300 and the stopper 400 of different materials according to the type of the component to transmit the torque to meet the torque amplitude of the current working environment. Not limited.

In one embodiment, the torque limiting device 1 may further include a positioning member 600, wherein the positioning member 600 is, for example, a set screw. On the other hand, the input member 100 can also be formed with a positioning member holding portion 170, wherein the positioning member holding portion 170 is, for example, a slot extending laterally along the input member 100 and communicating with the stopper holding portion 160, and the positioning member 600 abuts against connected to the top of the stopper 400. Thereby, even if the torque limiting device 1 is not operated in a horizontal state, the relative position of the stopper 400 and the catch portion 230 can still be ensured through the positioning member 600 without causing the stopper 400 to disengage from the stopper holding portion 160 The top falls off. However, in other possible implementations, the retaining portion 160 of the stopper may also be configured as a slot recessed on the lower surface of the input member 100 . In this case, the positioning piece 600 and the positioning piece holding portion 170 may not be provided, but the stopper 400 is held by the top wall and the side wall of the slot hole, which is not limited in the present invention.

Please refer to Figures 1 to 8 again, and especially Figures 3 and 6, in one embodiment, the positional relationship between the shearing portion 180, the shearing portion 280, and the stopper holding portion 160 can be configured as: When the device 1 is in the interlocking configuration, the shearing portion 180 and the shearing portion 280 are aligned with each other to accommodate the torque limiter 300, and at this time, the left locking portion 230 (ie, the left side wall) and the right locking portion 230 ( That is, the distance between the right side wall) and the stopper 400 is substantially equal. Through such a configuration, the user can rotate the input member 100 in different pivoting directions, and when the torque limiter 300 is damaged due to excessive torque, the stroke and time of the stopper 400 from idling to abutting against the catch portion 230 can be adjusted. Keep consistent, so the use flexibility of the torsion limiting device 1 in different pivoting directions can be improved.

Please refer to FIG. 1 to FIG. 8 again, and especially FIG. 3 and FIG. 5 , in one embodiment, the input member 100 and the output member 200 are respectively cylindrical, and the catch groove 250 is formed on the peripheral surface 240 of the output member 200 , and the central angle θ of a circular arc 242 formed by the peripheral surface 240 between the left side wall and the right side wall relative to the pivot axis A is 25-45 degrees. Specifically, when the torque limiter 300 is broken, the stopper 400 is adapted to slide a certain distance relative to the catch groove 250 and then catches with the stopper portion 230 , so that the stopper 400 can be instantly abutted against The feedback from the catch portion 230 prompts the user that the torque limiting member 300 is broken. However, when the above-mentioned moving distance is too long, the above-mentioned idling reaction force is likely to be generated, which may cause safety concerns for users. Therefore, the stopper 400 preferably slides about 8-15 degrees and then abuts against the catch portion 230. Considering the size of the stopper 400 itself, the range of the central angle θ is preferably designed to be 25-45 degrees. In this paper In the embodiment, for example, it is 37 degrees, but the present invention is not limited thereto, and the user can select a torque limiting device 1 with an appropriate distance between the catch portion 230 according to the specific appearance of the input member 100 and the output member 200 and the actual operating conditions .

The present invention has been disclosed above with preferred implementation modes, but those skilled in the art should understand that the above implementation modes are only used to describe the present invention, and should not be interpreted as limiting the scope of the present invention. And it should be noted that all changes and replacements equivalent to the above-mentioned embodiments should be deemed to be included in the scope of the present invention. Therefore, the scope of protection of this new creation should be defined by the scope of the patent application.

1: Torque limiting device 100: input piece 110: input part 112: Joint 114: perforation 150: shaft hole 160: stopper holding part 170: positioning part holding part 180: cut part 190: holder accommodating part 200: Output 210: output unit 220: Shaft 222: Connector holding part 230: stop part 240: week surface 242: arc 250: stop slot 280: Cutting Department 290: holder accommodating part 300: torque limiter 310: Part 1 320: Part Two 400: stopper 500: connector 600: positioning parts 700, 700a, 700b: holders 710: fixed part 720: Movable part 2: hand tools A: Pivot axis θ: Central angle

FIG. 1 is a three-dimensional schematic diagram of an embodiment of a torque limiting device created by the present invention in cooperation with a hand tool. FIG. 2 is an exploded schematic view of an embodiment of the torque limiting device of the present invention. Fig. 3 is a schematic front view of an embodiment of the torque limiting device of the present invention in a continuous configuration. FIG. 4 is a schematic top view of some components of an embodiment of the torque limiting device of the present invention. FIG. 5 is a schematic top view of another part of the torque limiting device of FIG. 4 . FIG. 6 is a schematic cross-sectional view of the torque limiting device of FIG. 3 . 7 is a schematic front view of a hand tool applying excessive torque to an embodiment of the torque limiting device of the present invention along a rotational direction. FIG. 8 is a schematic cross-sectional view of an embodiment of the torque limiting device of the present invention in a disconnected configuration.

1: Torque limiting device

100: input piece

110: input part

112: Joint

114: perforation

160: stopper holding part

170: positioning part holding part

180: cut part

190: holder accommodating part

200: Output

210: output unit

220: Shaft

222: Connector holding part

230: stop part

250: stop slot

280: Cutting Department

290: holder accommodating part

300: torque limiter

400: stopper

500: connector

600: positioning parts

700, 700a, 700b: holders

710: fixed part

A: Pivot axis

Claims (10)

A torque limiting device comprising: an input piece; an output member pivotally connected to the input member; and a torsion limiter, passing through the input piece and the output piece, the input piece and the output piece pivot around a pivot shaft, the torsion limiter is spaced apart from the pivot shaft, and the input piece and the output piece are selected permanently destroy the torque limiter. The torque limiting device as described in claim 1, further comprising: a stopper, pierced through the input piece and the output piece; Wherein, one of the input member and the output member includes at least one catch portion, and the stopper is adapted to abut against the at least one catch portion after the torque limiting member is broken. The torque limiting device as claimed in item 2, wherein one of the input member and the output member is formed with a catch groove, at least a part of the stop member is accommodated in the catch groove, and the The at least one catch portion is two opposite side walls of the catch slot in the pivoting direction. The torque limiting device as claimed in item 3, wherein the input member and the output member are respectively cylindrical, the catch groove is formed on the peripheral surface of one of the input member and the output member, and the peripheral The central angle of a circular arc formed between the two side walls relative to the pivot shaft is 25-45 degrees. The torque limiting device as claimed in item 3, wherein the input member and the output member respectively form a shearing portion, and when the torque limiting device is in a linked configuration, the shearing portions are aligned with each other, and the torque limiting At least a part of the piece is accommodated in each of the shearing portions, and the distances between the two side walls and the stopper are substantially equal. The torque limiting device according to claim 2, further comprising a positioning piece, the other of the input piece and the output piece forms a stopper holding portion and a positioning piece holding portion, a part of the stopper Abutting against the stopper holding portion, the positioning piece holding portion communicates with the stopper holding portion, and the positioning piece abuts against the stopper. The torque limiting device according to claim 1, further comprising at least one holding member, the input member and the output member are respectively formed with a shearing portion, and at least one of the input member and the output member is formed with a holding member at least a part of the torque limiting member abuts against each of the shearing parts, the holding part accommodating part communicates with the corresponding corresponding cutting part, the at least one holding part holds the torque limiting part and passes through in the holding part accommodating part. The torque limiting device as claimed in item 7, wherein the at least one holding member comprises: a fixing part configured in the holding part accommodating part; and A movable part is disposed in the corresponding shearing part and movably connected to the fixed part, and the at least one holding part selectively abuts against the torsion limiting part through the movable part. The torque limiting device according to claim 1 further includes a connecting piece, the connecting piece abuts against the input piece and the output piece, and the pivot shaft passes through the connecting piece. The torque limiting device as claimed in claim 9, wherein one of the input member and the output member includes a shaft portion, and a connecting member holding portion is formed on the shaft portion, and the other of the input member and the output member is formed There is a shaft hole, the shaft part passes through the shaft hole, a part of the connecting part is arranged in the holding part of the connecting part, and the other part of the connecting part abuts against the input part and the output part the other.

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