TWI823600B - Torque limiting device - Google Patents

Abstract

The invention provides a torque limiting device, which includes an input member, an output member and a torque limiting member. The output piece is pivotally connected to the input piece; the torque limiting piece is passed through the input piece and the output piece, the input piece and the output piece pivot around a pivot axis, the torque limiting piece is spaced apart from the pivot shaft, and the input piece and the output piece are selectively Destroy the torque limiting piece, that is, when the torque is too large, the input piece and the output piece will destroy the torque limiting piece.

Description

Torque limiting device

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

The lever principle is a mechanical principle widely used in many torsion elements. Generally speaking, when the user wants to rotate a mechanical component with a specific size, he or she can apply an external force on a force-exerting arm according to actual needs, and arrange the mechanical component to be rotated on the resisting arm, and adjust the force application. The length of the arm or resistance arm amplifies or reduces the torque caused by external force to achieve the effect of saving labor or time. Taking the fire protection field as an example, firefighters can use manual wrenches and automatic wrenches to engage the bolt heads on the outside of 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 operating codes stipulate that construction workers must install or disassemble in accordance with the set torque value, neither manual wrenches nor automatic wrenches can ensure that the torque during actual construction meets the specifications. Therefore, fire sprinklers often occur due to excessive torque. The internal components of the water head are deformed and leakage occurs. To this end, some manufacturers have developed tools such as adjustable torque wrenches and torque sleeves to solve the above problems. When the applied torque is greater than the set value, the internal mechanisms of the adjustable torque wrenches and torque sleeves will trip and stop. Torque transmission. However, in order to complete the construction work as quickly as possible, some construction workers will restore the above-mentioned internal mechanism after it has jumped and continue to use it, thus losing the meaning of the torque limit. In addition, since fire sprinkler heads need to be installed in various environments, adjustable torque wrenches and torque sleeves are There are many restrictions on storage and portability, installation speed and cost considerations, so it is difficult to become a universal torque limiting component for fire sprinkler heads.

The inventor then devoted his mind to research and developed a torque limiting device that can truly prevent the transmission of torque when the torque is too large, in order to reduce human variables and improve the efficiency of installing or disassembling mechanical components.

The invention provides a torque limiting device, which includes an input member, an output member and a torque limiting member. The output piece is pivotally connected to the input piece; the torque limiting piece is passed through the input piece and the output piece, the input piece and the output piece pivot around a pivot axis, the torque limiting piece is spaced apart from the pivot shaft, and the input piece and the output piece are selectively Destroy 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 blocking portion, and the blocking member is adapted to abut against the blocking portion after the torque limiting member is destroyed.

In one embodiment, one of the input member and the output member is formed with a blocking groove, at least a part of the blocking member is accommodated in the blocking groove, and the blocking portion is the blocking groove in the pivot direction. on two opposite side walls.

In one embodiment, the 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 faces each other. The central angle of the pivot axis is 25 to 45 degrees.

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

In one embodiment, the torque limiting device further includes a positioning member, and the other one of the input member and the output member is formed with a stopper holding part and a positioning member holding part, and a part of the stopper is in contact with the stopper. The positioning piece holding part is connected to the stopper holding part, and the positioning part is in contact with the stopper.

In one embodiment, the torque limiting device further includes at least one retaining component, the input component and the output component are respectively formed with a shearing part, and at least one of the input component and the output component is formed with a retaining component accommodating part. At least a part of the torque limiter is in contact with each shearing part, the holder accommodating part is connected to the corresponding shearing part, and the holder holds the torque limiter and is inserted into the holder accommodating part.

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

In one embodiment, the torque limiting device further includes a connecting piece, the connecting piece is in contact with the input piece and the output piece, and the pivot axis passes through the connecting piece.

In one embodiment, one of the input member and the output member includes a shaft portion, a connecting member holding portion is formed on the shaft portion, and the other of the input member and the output member is formed with a shaft hole, and the shaft portion is inserted through the shaft. hole, a part of the connecting piece is disposed in the connecting piece holding part, and the other part of the connecting piece is in contact with the other one of the input piece and the output piece.

Thereby, in the torque limiting device of the present invention, when the torque is less than the set value, the torque limiting member can drive the output member to rotate synchronously when the input member receives external torque; and when the torque is greater than the set value, the input member and the output member will destroy the torque. The limiting piece is released from the linkage relationship, and the user needs to replace the torque limiting piece with a new one before working again, thus achieving the effect of reducing human variability and improving the efficiency of installing or disassembling mechanical components.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

1: Torque limiting device

100:Input piece

110:Input part

112:Joint

114:Perforation

150:Shaft hole

160: Stopper holding part

170: Positioning piece holding part

180: Cutting part

190: Holder accommodating part

200:Output piece

210:Output Department

220: Shaft

222: Connector holding part

230:Block part

240:surround surface

242:Arc

250:Block groove

280: Cutting Department

290: Holder accommodating part

300: Torque limiter

310:Part 1

320:Part 2

400:stop

500: Connector

600: Positioning parts

700, 700a, 700b: retaining parts

710: Fixed department

720: Movable part

2:Hand tools

A: Pivot axis

θ: central angle

Figure 1 is a schematic three-dimensional view of an embodiment of the torque limiting device of the present invention cooperating with a hand tool.

FIG. 2 is an exploded schematic diagram of an embodiment of the torque limiting device of the present invention.

Figure 3 is a schematic front view of an embodiment of the torque limiting device of the present invention in a linked configuration.

FIG. 4 is a schematic top view of some components of the torque limiting device according to an embodiment of the present invention.

FIG. 5 is a schematic top view of another component 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 exerting excessive torque on an embodiment of the torque limiting device of the present invention along a rotation direction.

8 is a schematic cross-sectional view of an embodiment of the torque limiting device of the present invention in a disconnected configuration.

The aforementioned and other technical contents, features and effects of the present invention 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 for reference to the directions in the attached drawings. Accordingly, the directional terms used are illustrative rather than limiting. In addition, in the following embodiments, the same or similar elements will use the same or similar reference numerals.

Please refer to FIGS. 1 and 2 . FIG. 1 is a schematic perspective view of a torque limiting device in cooperation with a hand tool according to an embodiment of the present invention, and FIG. 2 is an exploded view of an embodiment of the torque limiting device in the present invention. The torque limiting device 1 of this embodiment can be applied to fire sprinklers, water pumps or construction-related components to transmit and limit the torque output to the above components, and the torque limiting device The device 1 includes an input member 100, an output member 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 is disposed through the input member 100 and the output member 200, and the input member 100 and The output member 200 selectively destroys the torque limiting member 300 .

As shown in FIGS. 1 and 2 , the input member 100 may include an input part 110 , wherein the shape and size of the input part 110 correspond to the shape and size of the opening of a hand tool 2 serving as a torque input source, and the hand tool 2 may be A manual wrench or an automatic wrench, but the invention is not limited to this. 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 an object to which torque is to be transmitted, such as a nut of a fire sprinkler head (not shown). ), and the output part 210 is suitable for fitting into the hole of the nut, but the present invention does not limit the type of object to which torque is to be transmitted and the actual coupling method between the output part 210 and the object to which torque is to be transmitted.

Please refer to Figures 1 to 5 together, and particularly Figures 2, 4 and 5. Figure 3 is a schematic front view of an embodiment of the torque limiting device of the present invention in a linked configuration, and Figure 4 is a schematic front view of the torque limiting device according to the present invention. A schematic top view of some components of the torque limiting device according to an embodiment of the invention, and FIG. 5 is a schematic top view of another component of the torque limiting device in 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.

In detail, the output member 200 may include a shaft portion 220, and the input member 100 may be formed with a shaft hole 150, and the shaft portion 220 passes 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 torsion limiting member 300 is, for example, a bar, 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 is, for example, two, respectively. They are respectively arranged on the opposite sides of the input member 100 and the output member 200 on the pivot axis A, and the torque is limited. The component 300 is inserted into the input component 100 and the output component through the shearing part 180 and the shearing part 280 on one side. 200. Thereby, when the torque limiting device 1 is in a linked configuration, the shearing part 180 and the shearing part 280 are aligned with each other, and at least a part of the torque limiting member 300 is accommodated in the shearing part 180 and the shearing part 280 And is in contact with 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 torsion, so when the input member 100 receives an external torque through the input member 110 , After receiving the torque of the hand tool 2, the torque can be transmitted to the output member 200, and can be transmitted to the object to which the torque is to be transmitted through the output part 210, thereby achieving the effect of transmitting the torque. The input member 100 may also include a shaft portion, and the output member 200 may be formed with a shaft hole to combine the two, and the torsion limiting member 300 may be disposed in the shearing portion 180 and the shearing portion 280 on both sides at the same time. The invention is not limited in this regard.

Please refer to FIGS. 1 to 6 together, and particularly to FIGS. 2 , 5 and 6 , wherein FIG. 6 is a schematic cross-sectional view of the torque limiting device of FIG. 3 . In one embodiment, the torque limiting device 1 may further include a connecting member 500 , where the connecting member 500 is, for example, a spring pin and abuts 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 may be formed with a joint part 112, wherein the joint part 112 is connected to the shaft hole 150; in addition, the shaft part 220 is formed with a connector retaining part 222, where the connector retainer 222 is, for example, a through hole or a through hole. slot. After the input piece 100 and the output piece 200 are assembled, a part of the shaft part 220 can be accommodated in the joint part 112, a part of the connecting piece 500 can be disposed in the connecting piece holding part 222, and the connecting piece 500 can The other part can abut against the inner wall of the joint portion 112 of the input member 100 . Thereby, when the torque limiting device 1 is in the above-mentioned linkage configuration or the disconnection 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 by a spring. The elastic force of the pin enables the input member 100 and the output member 200 to be fastened to each other in the extension direction of the pivot axis A (hereinafter described as the axial direction) without being separated from each other, and since the pivot axis A passes through the connecting member 500, the connection is The component 500 will not release the above-mentioned locking relationship due to the relative pivoting of the input component 100 and the output component 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 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 in the joint part 112, and through the tight fit of the hand tool 2 and the joint part 112 The linkage drives the input member 100 to rotate. In other words, the input piece 100 of this embodiment can correspond to both an open-end wrench and a wrench without an opening, and therefore can be applied to a variety of different hand tools.

Furthermore, in one embodiment, the input part 110 may also be formed with at least one through hole 114 . In the embodiments of FIGS. 2 and 6 , the number of the through holes 114 is, for example, two, and they are respectively arranged at opposite sides of the input part 110 . on both sides. Thereby, after the input component 100 and the output component 200 are assembled, the user can directly pass the connector 500 through the through hole 114 and into the connector retaining portion 222 , making it more convenient to assemble the connector 500 .

Please refer to Figures 7 and 8. Figure 7 is a schematic front view of an embodiment of the torque limiting device of the present invention when a hand tool exerts excessive torque in a rotation direction, and Figure 8 is an implementation of the torque limiting device of the present invention. A cross-sectional view of the example in a disconnected configuration. When the user uses the hand tool 2 to apply excessive torque to the torque limiting device 1 in the direction of the arrow in FIG. Shear strength, and together with the shearing part 280, the torsion limiting member 300 is destroyed and sheared into a first part 310 and a second part 320, where the first part 310 is accommodated in the shearing part 180, The second part 320 is accommodated in the shearing part 280, and the first part 310 and the second part 320 are independent of each other. In this way, the input member 100 and the output member 200 can cancel the linkage relationship, and the object to be transmitted torsion will not be damaged or deformed by excessive torsion, thereby being protected. If the user wants to work again, he needs to replace it with a new one. Limit piece 300 is required to make input piece 100 and The output member 200 restores the linkage relationship in the pivot direction, thereby reducing human variables and improving the efficiency of installing or disassembling mechanical components.

Please refer to FIGS. 1 to 8 again, and particularly FIGS. 2 , 3 , 6 and 8 . In one embodiment, the torque limiting device 1 may further include at least one retainer 700 . In this embodiment, the retainer 700 The number of 700 is two, and they are respectively arranged in the input part 100 and the output part 200. In the following, the holding parts 700 arranged in the input part 100 and the output part 200 are respectively described as holding parts 700a and 700b. Specifically, at least one of the input piece 100 and the output piece 200 can be formed with a holder accommodating portion. In this embodiment, the input piece 100 and the output piece 200 are both formed with a holder accommodating portion, wherein each holder has a holder accommodating portion. The accommodating part may be a slot, and the number and position thereof correspond to the shearing part 180 and the shearing part 280. In the following, the holder accommodating part 190 and the holder accommodating part 290 are used to describe the shearing parts 180 and 290 respectively. The holder receiving portion of the shearing portion 280. The holder accommodating part 190 and the holder accommodating part 290 respectively extend along the lateral direction of the input part 100 and the output part 200 and communicate with the shearing part 180 and the shearing part 280, while the holder 700a and the holder 700b hold the torque limiting part 300 and penetrated through the holder accommodating part 190 and the holder accommodating part 290 respectively. Therefore, when the user wants to use the torque limiting device 1 again after the torque limiting member 300 is damaged, a new torque limiting member 300 can be arranged in the shearing part by adjusting the retaining member 700a and/or the retaining member 700b. 180 and the shearing part 280, or move the first part 310 and the second part 320 that are damaged due to excessive torque out of the shearing part 180 and the shearing part 280, thereby achieving the effect of quickly replacing the torque limiting member 300. . However, in other possible embodiments, the shearing part 180 and the shearing part 280 may also be a slot respectively, and the user may not configure the holding member 700 but use the bottoms of the shearing part 180 and the shearing part 280 The holding torque limiting member 300 is not limited by the present invention.

Please refer to FIGS. 1 to 8 again, and especially FIGS. 2 , 4 and 5 . In one embodiment, each holding member 700 may be a positioning bead and include a fixed part 710 and a movable part 720 , wherein each holding member 700 may be a positioning bead. solid 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 bead, which can be disposed in the shearing part 180 and the shearing part 180 as shown in Figures 4 and 5. part 280 and is movably connected to each fixing part 710 through a spring, for example. When the user wants to insert the torque limiting member 300 into the shearing part 180 and the shearing part 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 with his hand. 720, at this time, the torque limiting member 300 will no longer be contacted 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 removed, the movable part 720 will be moved to the shearing part 180 and/or the shearing part 280 again by the spring force and abut against the torsion limiting member 300 . In other words, the holding member 700 can selectively contact the torque limiting member 300 through the movable portion 720 , so the user can save the process of rotating and moving the holding member 700 through a tool during operation, further improving the convenience of using the torque limiting device 1 sex.

Please refer to FIGS. 1 to 8 again, and especially FIGS. 2 to 5 . Since the working environment of the user when operating the torque limiting device 1 may not be very stable (for example, standing on a ladder), when the torque limiting member 300 When the input part 100 and the output part 200 are broken due to excessive torque, the reaction force generated by idling between the input part 100 and the output part 200 due to entering the disconnection configuration is dangerous to the operators. Therefore, in one embodiment, the torque limiting device 1 may further include a stopper 400 , where the stopper 400 is, for example, a rod and penetrates 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 part. In this embodiment, for example, the output member 200 includes two stopper parts 230 , and the stopper 400 is adapted to be in the torque limiting member. 300 is broken and abuts against the blocking portion 230 .

Specifically, in this embodiment, the input member 100 can also be formed with a stopper retaining portion 160 , where the stopper retaining portion 160 is, for example, a through hole and penetrates the input member 100 in the axial direction; in addition, the output member 200 can A blocking groove 250 is formed, and the blocking portion 230 is two side walls of the blocking groove 250 facing each other in the pivot direction. When the input part 100 and the output part 200 are assembled, a part of the stopper 400 is accommodated The stopper holding part 160 is in contact with the side wall of the stopper holding part 160 , and the other part of the stopper 400 is received in the blocking groove 250 and can slide relative to the bottom surface of the blocking groove 250 . Through such a configuration, when the user applies excessive torque and causes the torque limiting member 300 to break, 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 stop while pivoting. The holding part 160 drives the stopper 400 to pivot together. After moving a certain distance, the stopper 400 will be blocked by the right stopper 230 as shown in FIG. 7 and stop. Therefore, it can effectively prevent the input part 100 and the Safety concerns arise from the reaction force generated by the idling of the output member 200. However, in other possible embodiments, the input part 100 may also be formed with a blocking groove and a blocking part, and the stopper 400 is disposed at the stopper retaining part of the output part 200 , which is not limited by the present invention. .

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 material of the torsion limiting member 300 is, for example, made of aluminum. Under the action of excessive torque, when the torque limiting member 300 is damaged by the shearing part 180 and the shearing part 280, the stopper 400 can withstand the corresponding shearing force without being damaged, thereby ensuring safety during operation. However, in order to avoid installation troubles for the user, the torque limiting member 300 is not configured and only the stopper 400 is used as the synchronous pivot limiting element of the input member 100 and the output member 200. The torque limiter 300 and the stopper 400 are The materials may also be aluminum, that is, the shear strength of the torsion limiting member 300 may be equal to the shear strength 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 components that want to transmit torque to meet the torque amplitude of the current working environment. This is not the case in the present invention. be restricted.

In one embodiment, the torque limiting device 1 may further include a positioning member 600 , where the positioning member 600 is, for example, a stop screw. On the other hand, the input piece 100 can also be formed with a positioning piece holding portion. 170, where the positioning piece holding portion 170 is, for example, a slot extending laterally along the input piece 100 and connected to the stopper holding portion 160, and the positioning piece 600 is in contact with 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 stopper part 230 can still be ensured through the positioning part 600 without causing the stopper 400 to move away from the stopper retaining part 160 The top comes off. However, in other possible implementations, the stopper retaining portion 160 may also be provided as a slot recessed in the lower surface of the input member 100 . In this case, the positioning member 600 and the positioning member holding part 170 may not be provided, and the stopper 400 may be held by the top wall and side wall of the slot, which is not limited by the present invention.

Please refer to FIGS. 1 to 8 again, and especially FIGS. 3 and 6 . In one embodiment, the positional relationship of the shearing part 180 , the shearing part 280 and the stopper retaining part 160 may be configured as follows: when the torque is limited When the device 1 is in the linked configuration, the shearing part 180 and the shearing part 280 are aligned with each other to accommodate the torque limiter 300, and at this time, the left blocking part 230 (i.e., the left side wall) and the right blocking part 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 pivot directions, and when the torque limiter 300 is damaged due to excessive torque, the stroke and time of the stopper 400 from idling to contacting the stopper 230 can be reduced. Being consistent, the elasticity of use of the torque limiting device 1 in different pivot directions can be improved.

Please refer to FIGS. 1 to 8 again, and especially FIGS. 3 and 5 . In one embodiment, the input member 100 and the output member 200 are respectively cylindrical, and the blocking groove 250 is formed on the peripheral surface 240 of the output member 200 . , and the central angle θ of an arc 242 formed by the peripheral surface 240 between the left wall and the right wall relative to the pivot axis A is 25 to 45 degrees. Specifically, when the torque limiter 300 is damaged, the stopper 400 is adapted to slide a certain distance relative to the catch groove 250 and then block with the catch portion 230 , so that the stopper 400 can be instantly contacted with the stopper 400 . The feedback feeling of the blocking portion 230 reminds the user that the torque limiting member 300 has broken. However, when the above-mentioned moving distance is too long, the above-mentioned idling reaction force is easily generated, causing safety concerns for the user. therefore, The stopper 400 preferably slides about 8 to 15 degrees and then contacts the stopper 230. Considering the size of the stopper 400 itself, the range of the central angle θ is preferably designed to be 25 to 45 degrees. In this embodiment, For example, it is 37 degrees, but the present invention is not limited thereto. The user can select the torque limiting device 1 with appropriate spacing stop portions 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 in preferred embodiments above. However, those skilled in the art should understand that the above embodiments are only used to describe the present invention and should not be interpreted as limiting the scope of the present invention. It should be noted that any changes and substitutions that are equivalent to the above embodiments should be deemed to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope of the patent application.

1: Torque limiting device

100:Input piece

110:Input part

112:Joint

114:Perforation

160: Stopper holding part

170: Positioning piece holding part

180: Cutting part

190: Holder accommodating part

200:Output piece

210:Output Department

220: Shaft

222: Connector holding part

230:Block part

250:Block groove

280: Cutting Department

290: Holder accommodating part

300: Torque limiter

400:stop

500: Connector

600: Positioning parts

700, 700a, 700b: retaining parts

710: Fixed department

A: Pivot axis

Claims (9)

A torque limiting device, including: an input piece; an output piece, pivotally connected to the input piece; a stopper piece, passing through the input piece and the output piece; and a torque limiting piece, penetrating the input piece And the output member, the input member and the output member pivot around a pivot axis, one of the input member and the output member includes at least one stop portion, the torque limiting member is spaced apart from the pivot axis, the input member The member and the output member selectively destroy the torque limiting member, and the stopper is adapted to abut the at least one blocking portion after the torque limiting member is destroyed. The torque limiting device as claimed in claim 1, wherein one of the input member and the output member is formed with a blocking groove, at least a part of the blocking member is accommodated in the blocking groove, and the At least one blocking part is two side walls of the blocking groove opposite to each other in the pivot direction. The torque limiting device as claimed in claim 2, 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 surface A central angle of an arc formed between the two side walls relative to the pivot axis is 25 to 45 degrees. The torque limiting device as claimed in claim 2, wherein the input member and the output member are each formed with a shearing portion. When the torque limiting device is in a linked configuration, each The shearing parts are aligned with each other, at least a part of the torsion limiting member is accommodated in each shearing part, and the distance between the two side walls and the stopper is substantially equal. The torque limiting device according to claim 1, further comprising a positioning member, the other of the input member and the output member is formed with a stopper retaining part and a positioner retaining part, a part of the stopper It is in contact with the stopper holding part, the positioning part holding part is connected with the stopper holding part, and the positioning part is in contact with the stopper. The torque limiting device according to claim 1, further comprising at least one retaining 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 retaining member container. At least a part of the torque limiting member is in contact with each of the shearing parts, the holder accommodating part is connected to the corresponding shearing part, and the at least one holder holds the torsion limiting member and is inserted through the shearing part. in the holder accommodating part. The torque limiting device according to claim 6, wherein the at least one holding member includes: a fixed part disposed in the holding part accommodating part; and a movable part disposed in the corresponding shearing part and movably connected to The fixed part, and the at least one retaining part selectively contacts the torsion limiting part through the movable part. The torque limiting device according to claim 1, further comprising a connecting member, the connecting member is in contact with the input member and the output member, and the pivot axis passes through the connecting member. The torque limiting device according to claim 8, wherein one of the input member and the output member includes a shaft portion, 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, and the shaft portion is passed through the shaft hole, a part of the connecting piece is disposed in the connecting piece holding part, and another part of the connecting piece is in contact with the other one of the input piece and the output piece.

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