Torque limiting device and torque output tool

Abstract

The utility model relates to the technical field of mechanical assembly, and provides a torque limiting device and a torque output tool, the torque limiting device comprises an input assembly, an output assembly, a first torque limiting assembly and a second torque limiting assembly, the input assembly is used for being connected with a torque output end; the output assembly is used for being connected with workpieces. The first torque limiting assembly is provided with a first friction surface and connected with the input assembly, and the first torque limiting assembly is suitable for being driven by the input assembly to rotate; the second torque limiting assembly is provided with a second friction face and connected with the output assembly, the second friction face is oppositely attached to the first friction face, and the second torque limiting assembly is suitable for driving the output assembly to rotate under driving of the first torque limiting assembly. According to the torque limiting device, the torque limiting device serves as a power transmission device between the pneumatic wrench and the workpiece, the maximum output torque of the pneumatic wrench can be limited through the torque limiting device, the torque of the pneumatic wrench can be effectively controlled, and the influence on the fastening effect due to the fact that the torque is out of tolerance can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical assembly, in particular to a torque limiting device and a torque output tool. Background Art

[0002] During vehicle assembly and after-sales maintenance, bolts and other fasteners are generally assembled using fixed-value torque wrenches or pneumatic wrenches. However, when the specified torque of the bolts is large, the tightening efficiency of the torque wrench is low and it requires more manpower. Although pneumatic wrenches can ensure installation efficiency, the tightening torque cannot be controlled and is too subjective, which can easily cause torque deviations and affect the tightening effect, making it impossible to properly control. Utility Model Content

[0003] A first aspect of the present invention provides a torque limiting device to address the drawback of the prior art that the torque of pneumatic wrenches cannot be controlled. The torque limiting device serves as a power transmission device between the pneumatic wrench and the workpiece. The torque limiting device can limit the maximum output torque of the pneumatic wrench, effectively control the torque of the pneumatic wrench, and avoid the influence of torque excess on the tightening effect.

[0004] A second aspect of the present invention provides a torque output tool.

[0005] The torque limiting device provided by the utility model includes:

[0006] An input component, used for connecting to a torque output end;

[0007] An output component, used for connecting with a workpiece;

[0008] a first torque limiting assembly having a first friction surface and connected to the input assembly, wherein the first torque limiting assembly is adapted to rotate under the drive of the input assembly;

[0009] The second torque limiting component has a second friction surface and is connected to the output component. The second friction surface is relatively fitted with the first friction surface. The second torque limiting component is suitable for driving the output component to rotate under the drive of the first torque limiting component.

[0010] According to the torque limiting device provided by the present invention, the second torque limiting component is sleeved on the output component and engaged with the output component.

[0011] According to the torque limiting device provided by the present invention, the first torque limiting component is sleeved on the output component, the input component is sleeved on the first torque limiting component, and the input component is engaged with the first torque limiting component.

[0012] According to the torque limiting device provided by the present invention, the first torque limiting components are provided in multiple groups, the number of the second torque limiting components corresponds to the number of the first torque limiting components, and the first torque limiting components and the second torque limiting components are alternately sleeved on the output component.

[0013] According to the torque limiting device provided by the present utility model, the output assembly includes:

[0014] Output sleeve, used for connecting with the workpiece;

[0015] a gear shaft bolt connected to the output sleeve and extending in a direction away from the output sleeve, the first torque limiting assembly and the second torque limiting assembly being sleeved on the gear shaft bolt, and the second torque limiting assembly being engaged with the gear shaft bolt;

[0016] A pre-tightening nut is provided at the end of the gear shaft bolt away from the output sleeve, and the pre-tightening nut cooperates with the output sleeve to limit the fit between the first torque limiting assembly and the second torque limiting assembly.

[0017] According to the torque limiting device provided by the present invention, the input assembly includes an input sleeve, a rotating cavity is formed inside the input sleeve, and an internal gear matching with the first torque limiting assembly is provided on the inner wall of the rotating cavity.

[0018] According to the torque limiting device provided by the present invention, it also includes a protective shell, which is sleeved on the outside of the output sleeve and the input sleeve, and the two ends of the protective shell are respectively abutted against the shoulders of the output sleeve and the input sleeve. The protective shell is used to limit the axial movement of the output sleeve and the input sleeve.

[0019] According to the torque limiting device provided by the present invention, the first torque limiting assembly includes one of a metal friction plate and a torque steel plate, and the second torque limiting assembly includes the other of the metal friction plate and the torque steel plate.

[0020] According to the torque limiting device provided by the present invention, the metal friction plate includes a metal base and a friction material layer, and the friction material layer is provided on at least one side of the metal base.

[0021] The torque output tool provided by the present invention comprises any one of the aforementioned torque limiting devices.

[0022] The torque limiting device provided in the embodiment of the present invention, when used in a torsion process, when the torque reaches a preset threshold, the friction between the first friction surface and the second friction surface will reach the maximum static friction force, thereby causing the first torque limiting component and the second torque limiting component to slide relative to each other, interrupting the torque transmission path. In this way, the second torque limiting component and the output component can stop rotating when the torque reaches the preset threshold, so that the tightening process is terminated, thereby achieving the purpose of torque limitation.

[0023] Compared with the prior art, the torque limiting device provided in the embodiment of the present invention, when used in a pneumatic wrench, can serve as a power transmission device between the pneumatic wrench and the workpiece. By limiting the maximum output torque of the pneumatic wrench through the torque limiting device, the torque of the pneumatic wrench can be effectively controlled, and the influence of torque excess on the tightening effect can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the exploded structure of the torque limiting device provided in an embodiment of the utility model.

[0026] Figure 2 It is a schematic cross-sectional view of the torque limiting device provided in an embodiment of the present utility model.

[0027] Figure 3 It is a schematic diagram of the axial side of the output shaft sleeve provided in an embodiment of the utility model.

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the output shaft sleeve provided in an embodiment of the utility model.

[0029] Figure 5 It is a schematic diagram of the axial side of the gear shaft bolt provided in an embodiment of the present utility model.

[0030] Figure 6 It is a schematic diagram of the axial side of the input sleeve provided in an embodiment of the utility model.

[0031] Figure 7 This is an axial side schematic diagram of the input sleeve provided by an embodiment of the present utility model from another perspective.

[0032] Figure 8 It is a schematic cross-sectional structural diagram of the input sleeve provided in an embodiment of the utility model.

[0033] Figure 9 It is a schematic diagram of the cross-sectional structure of the protective shell provided by an embodiment of the utility model.

[0034] Figure 10 It is an axial side schematic diagram of the metal friction plate provided in an embodiment of the present utility model.

[0035] Figure 11 It is an axial side schematic diagram of the torque steel sheet provided in an embodiment of the present utility model.

[0036] Figure 12 It is a schematic diagram of the application of the torque limiting device provided in an embodiment of the present utility model.

[0037] Reference numerals:

[0038] 10: Torque limiting device; 20: Torque output end; 30: Workpiece; 100: Input assembly; 110: Input sleeve; 111: Rotating cavity; 200: Output assembly; 210: Output sleeve; 220: Gear shaft bolt; 230: Pre-tightening nut; 300: Protective housing; 400: Metal friction plate; 410: Metal base; 420: Friction material layer; 500: Torque steel plate; 600: Elastic retaining ring. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0040] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0041] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0043] Figure 1 This is a schematic diagram of the exploded structure of the torque limiting device provided by an embodiment of the present utility model; Figure 2 It is a schematic cross-sectional view of the torque limiting device provided in an embodiment of the present utility model.

[0044] See Figure 1 and Figure 2 A first aspect of an embodiment of the present invention provides a torque limiting device 10, which includes an input component 100, an output component 200, a first torque limiting component and a second torque limiting component. The input component 100 is used to connect to the torque output end 20, such as the output transmission square tenon of a pneumatic wrench, or the output end of a pneumatic screwdriver; the output component 200 is used to connect to a workpiece 30, such as fasteners such as bolts and nuts. This article takes the bolt to be tightened as an example.

[0045] The first torque limiting component has a first friction surface and is connected to the input component 100. The connection between the two can be a snap connection, a fastener connection, or a key connection. The first torque limiting component is suitable for rotating under the drive of the input component 100. The second torque limiting component has a second friction surface and is connected to the output component 200. The connection between the two can also be a snap connection, a fastener connection, or a key connection. The second friction surface and the first friction surface are relatively fitted together. The second torque limiting component is suitable for driving the output component 200 to rotate under the drive of the first torque limiting component.

[0046] Specifically, when the torque output end 20 rotates, the input component 100 will rotate first. After the input component 100 rotates, it will rotate with the first torque limiting component. The first torque limiting component and the second torque limiting component transmit power through the static friction between the first friction surface and the second friction surface. Then, the second torque limiting component will rotate with the first torque limiting component, and then the output component 200 will rotate with the second torque limiting component. Finally, the output component 200 will transmit the rotational torque to the bolt to be tightened, so that the bolt to be tightened rotates to achieve tightening.

[0047] See Figure 1 and Figure 2 It can be understood that when the torque limiting device 10 provided in the embodiment of the present invention is used in a torsion process, when the torque reaches a preset threshold, the friction between the first friction surface and the second friction surface will reach the maximum static friction force, thereby causing the first torque limiting component and the second torque limiting component to slide relative to each other, interrupting the torque transmission path. In this way, the second torque limiting component and the output component 200 can stop rotating when the torque reaches the preset threshold, thereby terminating the tightening process and achieving the purpose of torque limitation.

[0048] Compared with the prior art, the torque limiting device 10 provided in the embodiment of the present invention, when used in a pneumatic wrench, can serve as a power transmission device between the pneumatic wrench and the workpiece 30. By limiting the maximum output torque of the pneumatic wrench through the torque limiting device 10, the torque of the pneumatic wrench can be effectively controlled, and the influence of the torque excess on the tightening effect can be avoided.

[0049] Continue reading Figure 1 and Figure 2 In an optional embodiment of the present invention, the second torque limiting component is sleeved on the output component 200 and meshes with the output component 200. Specifically, the second torque limiting component is a ring structure with an internal gear provided on the inner wall, and an external gear corresponding to the internal gear is provided on the output component 200. Power transmission is achieved between the two by meshing the internal and external gears.

[0050] It is understandable that the efficiency of gear transmission is generally above 95%, which means that energy loss is relatively small and it is particularly suitable for high-power transmission. Such a configuration helps the torque limiter 10 to be used in a high-torque environment (up to hundreds of Newton meters). In addition, the wheel transmission can provide a constant transmission ratio, which is very important for the torque limiter 10 that requires precise speed control. It can effectively improve the control of the maximum torque output by the torque output end 20 when the torque limiter 10 is in use.

[0051] In addition, the gear transmission can withstand a large load, which can ensure the stability and safety of the torque limiting device 10 in a large torque environment; in addition, under the same operating conditions, the gear structure requires a smaller installation space, which helps to design a compact mechanical system. At the same time, the gear structure is easy to inspect and maintain, which helps to reduce long-term operating costs.

[0052] Continue reading Figure 1 and Figure 2 In an optional embodiment of the present invention, the first torque limiting assembly is sleeved on the output assembly 200 and rotates with the output assembly 200. No power is transmitted between the two. Before the friction between the first friction surface and the second friction surface reaches the maximum static friction force, no power is directly transmitted between the first torque limiting assembly and the output assembly 200. Synchronous rotation is achieved between the two through the second torque limiting assembly. After the friction between the first friction surface and the second friction surface reaches the maximum static friction force, the transmission between the first torque limiting assembly and the second torque limiting assembly fails. At this time, the output assembly 200 only serves as the rotation axis of the first torque limiting assembly, and the input assembly 100 is sleeved on the first torque limiting assembly, and the input assembly 100 is meshed with the first torque limiting assembly.

[0053] Specifically, the first torque limiting assembly is also an annular structure. An external gear is provided on the outer wall of the first torque limiting assembly, and a corresponding internal gear is provided on the inner wall of the input assembly 100. Power is transmitted between the two through meshing of the internal and external gears. The inner wall of the first torque limiting assembly is smooth to facilitate rotational engagement with the output assembly 200. It is understood that the efficiency of gear transmission is generally above 95%, which means that energy loss is minimal, making it particularly suitable for high-power transmission. This facilitates the use of the torque limiting device 10 in high-torque environments (up to hundreds of Newton-meters). In addition, the gear transmission can provide a constant transmission ratio, which is very important for the torque limiting device 10 requiring precise speed control. This can effectively improve the control of the maximum torque output by the torque output end 20 of the torque limiting device 10 during use. In addition, the gear transmission can withstand large loads, ensuring the stability and safety of the torque limiting device 10 in high-torque environments. Furthermore, under the same operating conditions, the gear structure requires less installation space, facilitating the design of a compact mechanical system. The gear structure is also easy to inspect and maintain, helping to reduce long-term operating costs.

[0054] Continue reading Figure 1 and Figure 2In an optional embodiment of the present invention, multiple groups of first torque limiting assemblies are provided, and the number of second torque limiting assemblies corresponds to that of the first torque limiting assemblies. The first torque limiting assemblies and the second torque limiting assemblies are alternately sleeved on the output assembly 200. It can be understood that by providing multiple groups of first torque limiting assemblies and second torque limiting assemblies, the contact area between the first friction surface and the second friction surface will be greatly increased. In this way, the stress transmission between the first torque limiting assembly and the second torque limiting assembly will be more uniform, which helps to disperse the stress in the torque transmission process between the first torque limiting assembly and the second torque limiting assembly, reduce local stress concentration, make the torque transmission smoother, and reduce premature wear or damage caused by stress concentration.

[0055] In addition, by increasing the number of first torque limiting assemblies and second torque limiting assemblies, the maximum torque can be adjusted and controlled more accurately to meet the actual needs of different torques. Specifically, the contact area between each first friction surface and the second friction surface is increased, which can provide more torque adjustment points, making the torque control more precise, and making the torque limiting device 10 more flexible and able to meet more different application environments. In addition, the alternating installation of multiple first torque limiting assemblies and second torque limiting assemblies can provide a redundant design. Even if a first torque limiting assembly or a second torque limiting assembly fails or is damaged, the other first torque limiting assemblies and the second torque limiting assemblies can still continue to work, thereby ensuring the continuity and reliability of the operation of the torque limiting device 10.

[0056] In addition, since the stress of torque transmission is evenly distributed to multiple first torque limiting assemblies and second torque limiting assemblies, the load borne by each individual first torque limiting assembly or second torque limiting assembly will be relatively reduced, which can extend the service life of the first torque limiting assembly and the second torque limiting assembly, that is, extend the service life of the torque limiting device 10, and reduce the maintenance cost of the torque limiting device 10.

[0057] In addition, if a first torque limiting assembly or a second torque limiting assembly is damaged, it can be directly replaced separately, so there is no need to replace the entire torque limiting device 10, which saves usage costs and reduces maintenance time. In addition, the alternating installation of multiple first torque limiting assemblies and second torque limiting assemblies can improve energy conversion efficiency because the energy loss during torque transmission is dispersed to multiple first friction surfaces and second friction surfaces, reducing the concentrated energy loss on a single first friction surface or second friction surface.

[0058] Figure 3 This is a schematic diagram of the axial side of the output shaft sleeve provided by an embodiment of the utility model; Figure 4 This is a schematic cross-sectional view of the output shaft sleeve provided by an embodiment of the present utility model; Figure 5 It is a schematic diagram of the axial side of the gear shaft bolt provided in an embodiment of the present utility model.

[0059] See Figures 1 to 5 In an optional embodiment of the present invention, the output assembly 200 includes an output sleeve 210, a gear shaft bolt 220 and a pre-tightening nut 230. An internal gear is provided at one end of the inner side of the output sleeve 210, and a hexagonal hole is provided at the other end for final torque output, so as to be connected to the workpiece 30; the gear shaft bolt 220 is connected to the output sleeve 210 and extends in a direction away from the output shaft sleeve. The first torque limiting assembly and the second torque limiting assembly are sleeved on the gear shaft bolt 220, and the second torque limiting assembly is engaged with the gear shaft bolt 220. Specifically, the gear shaft bolt 220 is provided with an external gear. During installation, the gear shaft bolt 220 is inserted from the side of the output sleeve 210 where the hexagonal hole is provided, and the external gear of the gear shaft bolt 220 is engaged with the internal gear of the output sleeve 210. The first torque limiting assembly and the second torque limiting assembly are alternately installed on the gear shaft bolt 220.

[0060] The pre-tightening nut 230 is arranged at the end of the gear shaft bolt 220 away from the output sleeve 210. The pre-tightening nut 230 cooperates with the output sleeve 210 to limit the fit between the first torque limiting component and the second torque limiting component. In other words, by screwing the pre-tightening nut 230, the first torque limiting component and the second torque limiting component can be tightened, thereby providing a suitable pre-tightening force, that is, setting a preset threshold value of the torque.

[0061] It can be understood that the output sleeve 210 is the final link in the torque transmission. It receives the torque transmitted from the gear shaft bolt 220 and transmits it to the bolt or nut that needs to be tightened. Through the output sleeve 210, the torque of the pneumatic wrench can be effectively converted into the tightening force required by the fastener; in addition, the output sleeve 210 also plays a role in protecting internal components and supporting external loads, which can protect internal precision components from the influence of the external environment, while providing effective structural support for the torque limiting device 10.

[0062] It is understood that the gear shaft bolt 220 is a key link in the torque transmission path. Compared to the adjustable torque limiter in the prior art, the use of the gear shaft bolt 220 simplifies the structure of the device and reduces the additional torque adjustment mechanism, making the entire device more compact and lightweight, and convenient for use in different scenarios. The pre-tightening nut 230, by screwing onto the outer gear of the gear shaft bolt 220, applies a pre-tightening force to the first and second torque limiting assemblies. This pre-tightening force ensures close contact between the first and second torque limiting assemblies, thereby ensuring sufficient friction during the torque transmission process. In addition, the pre-tightening nut 230 also acts as a limiter. Based on the cooperation with the output sleeve 210, the first and second torque limiting assemblies can be fixed to the gear shaft bolt 220 to prevent them from accidentally moving relative to each other during the torque transmission process, ensuring the stability and reliability of the torque transmission. In addition, by adjusting the tightening degree of the pre-tightening nut 230, the pre-tightening force between the first torque limiting assembly and the second torque limiting assembly can be changed, thereby adjusting the torque output upper limit of the torque limiting device 10, that is, the preset torque threshold. This adjustment mechanism enables the torque limiting device 10 to adapt to different torque requirements.

[0063] Figure 6 This is a schematic diagram of the axial side of the input sleeve provided by an embodiment of the utility model; Figure 7 This is a schematic axial view of the input sleeve provided by an embodiment of the present utility model from another perspective; Figure 8 It is a schematic cross-sectional structural diagram of the input sleeve provided in an embodiment of the utility model.

[0064] See Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 and Figure 8 In an optional embodiment of the present invention, the input component 100 includes an input sleeve 110. A transmission square hole is provided on the outside of the input sleeve 110, and the transmission square hole is connected to the output transmission square tenon of the pneumatic wrench as a torque input. A rotating cavity 111 is formed inside the input sleeve 110. An internal gear that cooperates with the first torque limiting component is provided on the inner wall of the rotating cavity 111. The input sleeve 110 is engaged with the external gear on the outside of the first torque limiting component through the internal gear to serve as the torque input of the first torque limiting component.

[0065] Taking a pneumatic wrench as an example, when the torque limiting device 10 is used, the output square tenon of the pneumatic wrench is connected to the square hole on the input sleeve 110, and the hexagonal hole set on the output sleeve 210 is socketed with the head of the fastener to be tightened. When the pneumatic wrench is started, the torque drives the input sleeve 110, and the torque is transmitted to the second torque limiting component through the first torque limiting component engaged therewith, and then transmitted to the gear shaft bolt 220 through the second torque limiting component, and finally transmitted to the fastener through the output sleeve 210 engaged with the gear shaft bolt 220, thereby achieving the tightening purpose; when the tightening torque reaches the preset threshold, the friction between the first torque limiting component and the second torque limiting component reaches the maximum static friction force, the first torque limiting component and the second torque limiting component slide relative to each other, the torque transmission route is interrupted, the gear shaft bolt 220 and the output sleeve 210 stop rotating, the tightening process is terminated, and the purpose of torque limitation is achieved.

[0066] Figure 9 It is a schematic diagram of the cross-sectional structure of the protective shell provided by an embodiment of the utility model.

[0067] See Figure 1 、 Figure 2 and Figure 9 In an optional embodiment of the present invention, the torque limiting device 10 further includes a protective housing 300. The protective housing 300 is positioned over the outer sides of the output sleeve 210 and the input sleeve 110. The ends of the protective housing 300 abut against the shoulders of the output sleeve 210 and the input sleeve 110, respectively. The protective housing 300 is used to limit axial movement of the output sleeve 210 and the input sleeve 110. As will be appreciated, the protective housing 300, as the exterior structure of the torque limiting device 10, provides a physical barrier for the delicate components within, protecting them from external impact, dust, moisture, and other potentially damaging factors, thereby extending the service life of the torque limiting device 10. Furthermore, the protective housing 300 provides structural support for the entire torque limiting device 10, ensuring the stability and accurate alignment of the internal components, enabling efficient and accurate torque transmission. Furthermore, the presence of the protective housing 300 enhances the safety of the torque limiting device 10 by preventing internal components, such as the output sleeve 210 or the input sleeve 110, from accidentally falling off or flying off during operation, thereby protecting the operator.

[0068] Continue reading Figure 1 、 Figure 2 and Figure 9Optional embodiments of the present invention also include a circlip 600. Accordingly, a retaining ring groove is provided within the protective limiting housing near one end of the input sleeve. During installation, the protective housing 300 is inserted from the side of the output sleeve 210, and the protective housing 300 is pushed into place using appropriate pressure or a tool. The circlip 600 is then securely fastened in the retaining ring groove using circlip pliers. The securing of the circlip 600 relies on its own elasticity and the shape of the retaining ring groove. When the protective housing 300 is assembled, the circlip 600 is compressed and locked in the retaining ring groove, forming a tight connection that prevents movement of the circlip 600.

[0069] It is understood that, due to its elastic properties, the circlip 600 can be tightly mounted within the retaining ring groove of the protective housing 300, acting as an axial limiter. This ensures that the input sleeve 110 is axially fixed and prevents axial movement during use, thereby ensuring accurate and stable torque transmission. Furthermore, the circlip 600 is relatively easy to install; it can simply be placed within the retaining ring groove using circlip pliers and then secured with the protective housing 300. This design simplifies the assembly process of the entire torque limiting device 10 and improves assembly efficiency. Furthermore, because the circlip 600 is removable, it can be replaced individually when worn or damaged, without having to replace the entire input sleeve 110 or the protective housing 300, reducing maintenance costs and downtime.

[0070] Figure 10 This is a schematic diagram of the axial side of the metal friction plate provided by an embodiment of the present utility model; Figure 11 It is an axial side schematic diagram of the torque steel sheet provided in an embodiment of the present utility model.

[0071] See Figure 1 、 Figure 2 、 Figure 10 and Figure 11 In an optional embodiment of the present invention, the first torque limiting component includes one of the metal friction plate 400 and the torque steel plate 500, and the second torque limiting component includes the other of the metal friction plate 400 and the torque steel plate 500, wherein the torque steel plate 500 is an annular structure. When it is used as the first torque limiting component to cooperate with the input sleeve 110, the outer wall of the torque steel plate 500 can be provided with an external gear that cooperates with the input sleeve 110. When the torque steel plate 500 is used as the second torque limiting component to cooperate with the gear shaft bolt 220, the inner wall of the torque steel plate 500 can be provided with an internal gear that cooperates with the gear shaft bolt 220. The side wall of the torque steel plate 500 can be used to form the aforementioned first friction surface or second friction surface.

[0072] In an optional embodiment of the present invention, a metal friction plate 400 includes a metal base 410 and a friction material layer 420. The friction material layer 420 is disposed on at least one side of the metal base 410 to form the aforementioned first friction surface or second friction surface. The friction material layer 420 can be made of pure metal or powder metallurgy. The metal friction plate 400 has a similar structure to the torque steel plate 500, also having an annular structure. When the metal friction plate 400 functions as a first torque limiting component and is mated with the input sleeve 110, the outer wall of the metal base 410 can be provided with an external gear that mates with the input sleeve 110. When the metal friction plate 400 functions as a second torque limiting component and is mated with the gear shaft bolt 220, the inner wall of the metal base 410 can be provided with an internal gear that mates with the gear shaft bolt 220. Specifically, the configuration can be adapted to actual conditions. It is understood that the friction material layer 420 on the metal friction plate 400 can maintain stable friction performance under high loads and frequent use, thereby extending the service life of the torque limiting device 10.

[0073] Figure 12 It is a schematic diagram of the application of the torque limiting device provided in an embodiment of the present utility model.

[0074] See Figure 12 The second aspect of the embodiment of the present invention provides a torque output tool, which includes a pneumatic wrench and the torque limiting device 10 described in any of the aforementioned embodiments. When in use, the output square tenon of the pneumatic wrench is connected to the square hole on the input sleeve 110, and the hexagonal hole provided on the output sleeve 210 is sleeved with the head of the fastener to be tightened. When the pneumatic wrench is started, the torque drives the input sleeve 110, and the torque is transmitted to the second torque limiting component through the first torque limiting component engaged therewith, and then transmitted to the gear shaft bolt 220 through the second torque limiting component, and finally transmitted to the fastener through the output sleeve 210 engaged with the gear shaft bolt 220, thereby achieving the tightening purpose. It can be understood that the torque output tool provided by the embodiment of the present invention, because it includes any of the aforementioned embodiments, also has the beneficial effects of the torque limiting device 10 in any of the aforementioned embodiments. The specific beneficial effects can be referred to the above description, and will not be repeated here.

[0075] It should be noted that the technical solutions in the various embodiments of the present invention can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in this field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist, that is, it does not fall within the scope of protection of the present invention.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A torque limiting device, characterized in that: include: An input component (100) for connecting to a torque output end (20); An output assembly (200) for connecting to a workpiece (30); a first torque limiting component having a first friction surface and connected to the input component (100), wherein the first torque limiting component is adapted to rotate under the drive of the input component (100); The second torque limiting component has a second friction surface and is connected to the output component (200), the second friction surface being relatively fitted with the first friction surface, and the second torque limiting component is suitable for driving the output component (200) to rotate under the drive of the first torque limiting component.

2. The torque limiting device according to claim 1, characterized in that: The second torque limiting component is sleeved on the output component (200) and meshes with the output component (200).

3. The torque limiting device according to claim 2, characterized in that: The first torque-limiting component is sleeved on the output component (200), the input component (100) is sleeved on the first torque-limiting component, and the input component (100) is engaged with the first torque-limiting component.

4. The torque limiting device according to claim 3, characterized in that: The first torque limiting components are provided in multiple groups, the number of the second torque limiting components corresponds to the number of the first torque limiting components, and the first torque limiting components and the second torque limiting components are alternately sleeved on the output component (200).

5. The torque limiting device according to claim 3, characterized in that: The output component (200) comprises: An output sleeve (210) for connecting to a workpiece (30); a gear shaft bolt (220) connected to the output sleeve (210) and extending in a direction away from the output sleeve (210); the first torque limiting assembly and the second torque limiting assembly are sleeved on the gear shaft bolt (220); and the second torque limiting assembly is engaged with the gear shaft bolt (220); A pre-tightening nut (230) is provided at the end of the gear shaft bolt (220) away from the output sleeve (210), and the pre-tightening nut (230) cooperates with the output sleeve (210) to limit the fit between the first torque limiting assembly and the second torque limiting assembly.

6. The torque limiting device according to claim 5, characterized in that: The input assembly (100) comprises an input sleeve (110), a rotating cavity (111) is formed inside the input sleeve (110), and an internal gear matching the first torque limiting assembly is provided on the inner wall of the rotating cavity (111).

7. The torque limiting device according to claim 6, characterized in that: The invention also includes a protective shell (300), which is sleeved on the outside of the output sleeve (210) and the input sleeve (110), and the two ends of the protective shell (300) are respectively in contact with the shoulders of the output sleeve (210) and the input sleeve (110), and the protective shell (300) is used to limit the axial movement of the output sleeve (210) and the input sleeve (110).

8. The torque limiting device according to any one of claims 1 to 7, characterized in that: The first torque limiting assembly includes one of a metal friction plate (400) and a torque steel plate (500), and the second torque limiting assembly includes the other of the metal friction plate (400) and the torque steel plate (500).

9. The torque limiting device according to claim 8, characterized in that: The metal friction plate (400) comprises a metal base (410) and a friction material layer (420), wherein the friction material layer (420) is provided on at least one side of the metal base (410).

10. A torque output tool, characterized in that: The invention comprises a torque limiting device (10) as claimed in any one of claims 1 to 9.

Images