An overload-resistant adjustable torque wrench suitable for confined spaces

Abstract

This application belongs to the field of wrench technology. To address the problems of existing technologies where tightening cannot be performed in confined spaces, and the lack of overload protection and torque adjustment during tightening, this application provides an overload-resistant adjustable torque wrench suitable for confined spaces. It includes a quick-connect fitting, a compression assembly, and a torque adjustment mechanism mounted on a housing. The quick-connect fitting has one end rotatably penetrating the housing and the other end connected to the fastener to be tightened. The compression assembly is connected to the housing and fitted onto the quick-connect fitting, driving its rotation and simultaneously preventing overload. The torque adjustment mechanism has one end connected to the compression assembly and the other end penetrating it, used to adjust the tightening torque. This wrench has a compact overall design, small size, and is easy to carry and operate. It can be widely used in mechanical assembly, automotive repair, equipment maintenance, and other fields requiring precise tightening of fasteners in confined spaces.

Description

Technical Field

[0001] This invention belongs to the field of wrench technology, specifically relating to an overload-resistant adjustable torque wrench suitable for confined spaces. Background Technology

[0002] In industrial fields such as mechanical assembly, the connection quality of threaded fasteners such as bolts and nuts is directly related to the safety and reliability of the entire equipment or structure. To ensure a reliable connection and prevent loosening, a precise preload must be applied to the fasteners. The magnitude of the preload is usually achieved by controlling the tightening torque. As a key tool, the core function of a torque wrench is to control the tightening torque of the fasteners within a preset range, thereby ensuring the accuracy of the preload.

[0003] Traditional torque wrenches, such as click wrenches, are widely used in conventional spaces. For example, the head-rotatable torque wrench with publication number CN111745576A includes a wrench body and a wrench head, which are rotatably connected. The wrench body has a locking mechanism that keeps the wrench head and wrench body relatively fixed. The wrench head has multiple locking grooves into which the locking mechanism is engaged. This allows the wrench head to rotate to adapt to different usage environments. By adjusting the angle of the wrench head, tightening operations can be performed quickly, with precise torque control.

[0004] However, when faced with extremely confined operating spaces or blind spots, such as engine compartments, equipment cavities, and areas with dense pipelines, these existing wrenches reveal significant limitations. Existing wrenches typically require a certain oscillation arc to complete the tightening action. When space is limited, their handles often only allow for small reciprocating movements, rendering the tool unusable or resulting in extremely low operating efficiency. Furthermore, existing wrenches lack overload protection and adjustable torque structures, making them prone to overloading during actual use, leading to fastener failure, as well as requiring considerable effort to tighten.

[0005] Therefore, there is an urgent need to design an overload-resistant adjustable torque wrench suitable for confined spaces, fundamentally changing the way force is transmitted, and providing convenient operation for the operator while ensuring accuracy and safety, so as to solve the above problems. Summary of the Invention

[0006] To address the problems of existing technologies, such as the inability to tighten in confined spaces and the lack of overload protection and torque adjustment during tightening, this invention aims to provide an overload-resistant adjustable torque wrench suitable for confined spaces. The wrench includes a quick-connect fitting, a compression assembly, and a torque adjustment mechanism mounted on an assembly housing. The quick-connect fitting has one end rotatably penetrating the assembly housing and the other end connected to the fastener to be tightened. The compression assembly is connected to the assembly housing and fitted onto the quick-connect fitting, driving its rotation and simultaneously preventing overload during tightening. The torque adjustment mechanism has one end connected to the compression assembly and the other end penetrating it, used to adjust the tightening torque. This invention features a compact overall design, with all components rationally integrated into the assembly housing. Its small size makes it easy to carry and operate. Furthermore, this device employs a purely mechanical structure design, requiring no external power supply or hydraulic power, making it suitable for work scenarios without power or hydraulic equipment. It is highly practical and can be widely used in mechanical assembly, automotive repair, equipment maintenance, and other fields requiring precise tightening of fasteners in confined spaces.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An overload-resistant adjustable torque wrench suitable for confined spaces includes a mounting housing and further includes: The quick-connect connector has one end that rotates through the assembly housing, and the other end that connects to the fastener to be operated. The extrusion assembly is connected to the assembly housing and sleeved on the quick connector for driving the quick connector to rotate, while also preventing overload from twisting. The torque adjustment mechanism is connected at one end to the extrusion assembly and at the other end through the extrusion assembly, and is used to adjust the tightening torque.

[0008] Preferably, the extrusion assembly includes: The worm gear body is rotatably mounted inside the assembly housing and is sleeved on the quick-connect connector; The worm gear unit is rotatably inserted into the assembly housing and meshes with the worm wheel body; The transmission unit is coaxially arranged with the worm gear unit and works together to drive the worm gear unit to rotate.

[0009] Preferably, the worm gear unit includes: The worm gear is inserted into the assembly housing. The first gear sleeve is connected to the end of the worm gear, and the other end meshes with the transmission unit.

[0010] Preferably, the transmission unit includes: The second gear sleeve meshes with the first gear sleeve; The third sleeve is fitted onto the outer circumference of the second gear sleeve.

[0011] Preferably, the torque adjustment mechanism includes: The connecting rod is a hollow structure. One end of the connecting rod is connected to the inner cavity of the first gear sleeve, and the other end passes through the second gear sleeve and the third sleeve in sequence. An elastic element is sleeved on the connecting rod, and one end is connected to the second gear sleeve; The extrusion assembly is sleeved on the connecting rod and slides through the connecting rod, while simultaneously abutting against the other end of the elastic element.

[0012] Preferably, the extrusion assembly includes: The movable ring assembly is movably sleeved on the connecting rod and is used in conjunction with the sliding groove provided on the connecting rod; The screw is located inside the connecting rod cavity, and one end of it is threaded through the movable ring assembly; The rotating drum is connected to the other end of the screw and is rotatably connected to the end of the connecting rod.

[0013] Preferably, the moving ring assembly includes: The outer ring is fitted onto the connecting rod; The inner ring is movably set in the inner cavity of the connecting rod and is connected to the outer ring through a sliding groove. At the same time, the inner ring is threaded onto the screw rod.

[0014] Preferably, the wrench further includes: The positioning component, located at the bottom of the third sleeve, is used to limit the torque adjustment mechanism.

[0015] The beneficial effects of this invention are: This invention discloses an overload-resistant adjustable torque wrench suitable for confined spaces. Compared with the prior art, the improvement of this invention lies in: (1) This invention, through the extrusion assembly of a worm gear, transforms the circular oscillation motion of a traditional wrench centered on the fastener into a circular rotational motion along the wrench axis, fundamentally changing the force transmission method and satisfying tightening operations in confined spaces or blind spots such as engine compartments, equipment cavities, and areas with dense pipelines. Furthermore, the worm gear transmission method has a wide transmission ratio range, allowing for the design of a reasonable transmission ratio according to actual needs. This effectively reduces the torque value borne by the wrench itself while meeting the requirements for high-torque tightening, thus reducing the force exerted by the operator.

[0016] (2) This invention achieves overload protection by setting up a compression component, effectively solving the problem that existing wrenches, lacking overload protection, are prone to over-tightening, leading to fastener damage and failure. Furthermore, when the fastener is tightened to the preset state, the wrench will simultaneously produce a clear friction warning sound, promptly reminding the operator to stop applying force and preventing continued tightening that could cause fastener thread stripping, breakage, or damage to equipment connections, thus ensuring fastener connection quality and guaranteeing the safety and reliability of equipment assembly. This overload protection structure has a simple design, requiring no complex electronic detection components; it achieves overload warning only through the relative movement of the mechanical structure, exhibiting sensitive response and high reliability, without affecting the normal tightening operation of the wrench, and is suitable for the safety requirements of various industrial assembly scenarios.

[0017] (3) A torque adjustment mechanism and a positioning component are set up to achieve precise adjustment and fixation of the tightening torque, solving the problem that the existing wrench has a fixed torque and cannot adapt to the tightening requirements of fasteners of different specifications. Specifically, the screw drives the moving ring group to change the compression of the elastic element, which can linearly adjust the meshing pressure between the first gear sleeve and the second gear sleeve. The output torque value of the wrench can be set steplessly within a large range. With the help of the dial composed of pointer and indicator marks, the torque setting value is intuitive and clear, enabling the operator to make adjustments quickly and accurately. The positioning component is used to limit the torque adjustment mechanism to ensure its fixation with the assembly housing. It effectively prevents the moving ring group from rotating accidentally due to vibration or accidental contact during operation, avoiding changes in the pre-pressure of the elastic element and drift of the torque setting value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the wrench structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the wrench assembly housing of the present invention; Figure 3 This is a bottom view of the assembly housing of the present invention; Figure 4 This is a schematic diagram of the internal structure of the wrench of the present invention; Figure 5 Deconstruction of the wrench structure of the present invention Figure 1 ; Figure 6 Deconstruction of the wrench structure of the present invention Figure 2 ; Figure 7 This is a schematic diagram of the moving ring assembly connection structure of the present invention; Figure 8 This is an enlarged view of part A of the present invention; Figure 9 This is an enlarged view of the tooth structure of the second gear sleeve and the first gear sleeve of the present invention; The components include: 1. Assembly housing; 101. Side door; 102. Cover plate; 2. Positioning assembly; 201. Positioning plate; 202. Bolt; 203. Clamping block; 3. Quick connector; 301. Mounting connector; 4. Extrusion assembly; 401. Worm gear body; 402. Worm; 403. First gear sleeve; 404. Second gear sleeve; 4041. Limiting post; 405. Third sleeve; 4051. Limiting groove; 4052. Marker; 5. Torque adjustment mechanism; 501. Connecting rod; 5011. Groove; 502. Elastic element; 503. Extrusion assembly; 5031. Moving ring assembly; 5031A. Outer ring; 5032B. Inner ring; 5032. Screw; 5033. Rotary drum; 5033A. Pointer; 5034. Clamping sleeve. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments. The following embodiments are used for... This invention is described, but should not be used to limit its scope. Example 1

[0020] See attached document Figures 1-4 The invention relates to an overload-resistant adjustable torque wrench suitable for confined spaces, comprising a housing 1, a quick-connect fitting 3, a pressing assembly 4, and a torque adjustment mechanism 5. One end of the quick-connect fitting 3 rotatably passes through the housing 1, and the other end is connected to the fastener to be operated. The pressing assembly 4 is connected to the housing 1 and sleeved on the quick-connect fitting 3, used to drive the quick-connect fitting 3 to rotate, thereby tightening the fastener. One end of the torque adjustment mechanism 5 is connected to the pressing assembly 4, and the other end passes through the pressing assembly 4, used to adjust the tightening torque.

[0021] In use, by manually turning the pressing component 4, the quick connector 3 can be driven to rotate relative to the assembly housing 1. The quick connector 3 connects to the fastener to be operated, and then the fastener connection is tightened. The torque adjustment mechanism 5 adjusts the torque of the pressing component 4 when tightening, so as to avoid the fastener being loose due to insufficient tightening torque, or the fastener and its connected parts being prone to breakage due to excessive tightening torque.

[0022] In this embodiment, the extrusion assembly 4 includes a worm gear body 401, a worm unit, and a transmission unit. The worm gear body 401 is rotatably disposed within the assembly housing 1 and sleeved on the quick-connect fitting 3, and is fixedly connected to the quick-connect fitting 3 to drive the quick-connect fitting 3 to rotate. The worm unit is rotatably inserted into the assembly housing 1 and meshes with the worm gear body 401 to drive the worm gear body 401 to rotate. The transmission unit is coaxially disposed with the worm unit and cooperates with it to drive the worm unit to rotate, thereby enabling the quick-connect fitting 3 to rotate and complete the tightening operation. In use, the transmission unit drives the worm unit to rotate, the worm unit drives the worm gear body 401 to rotate, and the worm gear body 401 drives the quick-connect fitting 3 to rotate, thereby enabling the quick-connect fitting 3 to perform a tightening operation on the fastener connection to be operated.

[0023] Specifically, the worm unit includes a worm 402 and a first gear sleeve 403. The worm 402 is rotatably inserted into the assembly housing 1. One end of the first gear sleeve 403 is fixedly connected to the end of the worm 402 that extends out of the assembly housing 1, and the other end of the first gear sleeve 403 is engaged with the transmission unit. Manually rotating the transmission unit can drive the first gear sleeve 403 to rotate synchronously. The first gear sleeve 403 synchronously drives the worm 402 to rotate, which in turn drives the worm wheel body 401 to rotate. The worm wheel body 401 drives the quick-connect connector 3 to rotate, thereby enabling the quick-connect connector 3 to tighten the fastener connection to be operated.

[0024] Specifically, the transmission unit includes a second gear sleeve 404 and a third sleeve 405. The second gear sleeve 404 meshes with the first gear sleeve 403, and the third sleeve 405 is sleeved on the outer circumference of the second gear sleeve 404 and is slidably engaged with the second gear sleeve 404. Twisting the third sleeve 405 can drive the second gear sleeve 404 to rotate, thereby causing the second gear sleeve 404 to drive the first gear sleeve 403 to rotate, and finally drive the worm gear 402 to rotate synchronously. The second gear sleeve 404 can also slide up and down relative to the third sleeve 405.

[0025] Specifically, a limiting post 4041 is fixedly bonded to the outer wall of the second gear sleeve 404. The limiting post 4041 extends from the T-shaped limiting groove 4051 on the third sleeve 405 and is engaged in the limiting groove 4051, thereby realizing the sliding engagement of the second gear sleeve 404 and the third sleeve 405. The limiting post 4041 can slide back and forth in the limiting groove 4051.

[0026] In this embodiment, the compression component 4 not only drives the quick-connect connector 3 to rotate, but also prevents over-tightening, avoiding excessive tightening and preventing the quick-connect connector 3 from applying an overload tightening force to the fastener, which could damage the fastener. In use, manually rotating the third sleeve 405 causes it to slide and engage with the second gear sleeve 404. Driving the second gear sleeve 404 then drives the first gear sleeve 403 to rotate synchronously, which in turn drives the worm gear 402 to rotate. Finally, the worm gear 402 drives the worm wheel body 401 and its mounting connector 301 to rotate, thus achieving the tightening operation of the fastener.

[0027] As the fastener is continuously tightened, when the third sleeve 405 continues to rotate, since the fastener no longer rotates, the second gear sleeve 404 and the first gear sleeve 403 will tend to rotate relative to each other. Because there is a gap between the teeth of the second gear sleeve 404 and the first gear sleeve 403, when the second gear sleeve 404 rotates relative to the first gear sleeve 403, the two meshing teeth will rub together and produce a sound. This sound can indicate to the operator that the fastener has been tightened and no further force needs to be applied, thus avoiding damage to the fastener caused by the installation joint 301 continuing to apply tightening force to the fastener.

[0028] In this embodiment, the assembly housing 1 has an opening on the side corresponding to the worm gear 402. A detachable side door 101 is provided on the opening to facilitate opening and closing, and to facilitate the inspection and maintenance of the worm gear 402. The side door 101 is detachably connected to the opening by bolts. When it is necessary to remove the side door 101, only the bolts need to be unscrewed to remove the side door 101 for maintenance of the worm gear 402. Afterwards, the side door 101 can be reinstalled by bolts.

[0029] A cover plate 102 can also be detachably provided on the assembly housing 1. The cover plate 102 is detachably connected to the assembly housing 1 by screws. The cover plate 102 and the side door 101 together with the assembly housing 1 form a sealed housing. This housing encloses the worm 402 and the worm wheel body 401 inside it without affecting the operation of the worm wheel body 401 and the worm 402.

[0030] In this embodiment, the quick-connect coupling 3 includes a mounting shaft and a mounting connector 301. The mounting shaft movably passes through the assembly housing 1 and is rotatably connected to the assembly housing 1. The lower end of the mounting shaft is inserted into and connected to the mounting connector 301. The mounting connector 301 is used to connect with a fastener, thereby achieving the tightening operation of the fastener by rotating the mounting connector 301. Specifically, the mounting connector 301 can be a mounting connector similar to a hexagonal wrench, but in this case, it is four-sided.

[0031] The usage process of the overload-resistant adjustable torque wrench suitable for confined spaces in this embodiment is as follows: When it is necessary to tighten the fastener, first insert the mounting connector 301 into the tightening head that is compatible with the fastener. When tightening is required, the operator first holds the assembly housing 1 with one hand, and then uses the other hand to rotate the end of the worm gear 402 that extends out of the assembly housing 1. The rotation of the worm gear 402 will drive the worm wheel body 401 to rotate. The rotation of the worm wheel body 401 will drive the mounting shaft to rotate, which in turn will drive the mounting connector 301 to rotate, so that the mounting connector 301 drives the tightening head to rotate. During the rotation of the tightening head, the fastener will rotate to tighten it. This embodiment utilizes a worm gear drive to convert the circular motion of the wrench around the fastener during tightening into a circular motion along the wrench's axis. Therefore, when tightening the fastener, the wrench's reciprocating motion is no longer required. The worm gear drive has a wide transmission ratio range, allowing for different transmission ratios to be designed as needed. This adapts to high torque requirements, reduces the torque value borne by the wrench itself, and increases the accuracy of torque control.

[0032] In this embodiment, a torque adjustment mechanism 5 is also provided. The torque adjustment mechanism 5 is disposed inside the first gear sleeve 403, the second gear sleeve 404, and the third sleeve 405. One end is rotatably connected to the inside of the first gear sleeve 403 through a bearing, and the other end extends out of the end of the third sleeve 405 and is rotatably connected to the third sleeve 405 through a bearing. At the same time, the torque adjustment mechanism 5 is also connected to the second gear sleeve 404 to drive the second gear sleeve 404 to move closer to and away from the first gear sleeve 403 along the axial direction of the third sleeve 405 (at this time, the limiting post 4041 slides back and forth along the limiting slide groove 4051). It can also adjust the tooth contact force between the first gear sleeve 403 and the second gear sleeve 404 to achieve the purpose of adjusting the tightening torque.

[0033] In this embodiment, refer to the appendix Figures 4-9 As shown, the torque adjustment mechanism 5 includes a connecting rod 501, an elastic element 502, and a pressing assembly 503. One end of the connecting rod 501 is rotatably connected to the inside of the first gear sleeve 403 via a bearing, and the other end passes through the second gear sleeve 404 and the third sleeve 405 in sequence, and extends out of the outer end of the third sleeve 405, while being rotatably connected to the third sleeve 403 via a bearing.

[0034] The elastic element 502 is sleeved on the connecting rod 501, with one end fixedly bonded to the bottom of the second gear sleeve 404 and the other end abutting against the extrusion assembly 503. The extrusion assembly 503 is sleeved on the connecting rod 501 and slidably connected to the connecting rod 501. The elastic element 502 can be a spring or a spring sheet.

[0035] By driving the extrusion assembly 503, the extrusion assembly 503 slides on the connecting rod 501 and compresses the elastic element 502, ultimately pushing the second gear sleeve 404 close to the first gear sleeve 403 and finally meshing with the first gear sleeve 403 to achieve torque preset.

[0036] In this embodiment, refer to the appendix Figures 5-9 As shown, the extrusion assembly 503 includes a movable ring assembly 5031, a screw 5032, and a rotating drum 5033. The movable ring assembly 5031 is sleeved on the connecting rod 501 and is slidably connected to the connecting rod 501. The connecting rod 501 has a hollow structure. The screw 5032 is inserted into the connecting rod 501. One threaded end of the screw 5032 passes through the movable ring assembly 5031 and is threadedly connected to the movable ring assembly 5031. The other end is fixedly connected to the rotating drum 5033. The rotating drum 5033 is rotatably sleeved on the end of the connecting rod 501 through a bearing and extends out of the bottom outer side of the third sleeve 405.

[0037] In use, the rotating cylinder 5033 located on the outer side of the bottom of the third sleeve 405 is rotated. The rotating cylinder 5033 drives the screw 5032 to rotate. The screw 5032 causes the moving ring assembly 5031 to slide on the connecting rod 501, thereby compressing the elastic element 502, and finally pushing the second gear sleeve 404 close to the first gear sleeve 403, and finally meshing with the first gear sleeve 403. At this time, the elastic element 502 is in a compressed state. The target torque can be preset by the degree of compression of the elastic element 502 (the spring compression is proportional to the torque). When the third sleeve 405 is manually rotated, the third sleeve 405 drives the second gear sleeve 404 to rotate synchronously. The second gear sleeve 404 drives the first gear sleeve 403 to rotate synchronously. The first gear sleeve 403 drives the worm 402 to rotate. The worm 402 drives the worm wheel body 401 to rotate. The rotation of the worm wheel body 401 drives the mounting shaft to rotate, which in turn drives the mounting joint 301 to rotate, realizing the tightening operation of the fastener. When the fastener is tightened, the whole consisting of the worm wheel body 401, worm 402 and first gear sleeve 403 stops working. During this process, as the second gear sleeve 404 is continuously tightened, the teeth on the second gear sleeve 404 will slide relative to the tooth side of the first gear sleeve 403, thereby squeezing the tooth side of the second gear sleeve 404. This causes the second gear sleeve 404 to move away from the first gear sleeve 403 and slide down relative to the third sleeve 405, squeezing the elastic element 502. Ultimately, this causes the first gear sleeve 403 and the second gear sleeve 404 to disengage. This ensures that the force applied to the fastener during the entire tightening process is a preset torque value. When the preset target torque value is reached, the first gear sleeve 403 and the second gear sleeve 404 will automatically disengage, avoiding over-tightening or insufficient tightening force.

[0038] In the embodiments of this application, such as Figure 9As shown, the second gear sleeve 404 and the first gear sleeve 403 have the same tooth structure. Both teeth have a gentle slope on both sides and an arc-shaped structure on both sides of the tooth tip. Therefore, when the second gear sleeve 404 rotates relative to the stationary first gear sleeve 403, the gentle slope on both sides of the teeth and the arc-shaped structure on both sides of the tooth tip will cause the second gear sleeve 404 to move away from the first gear sleeve 403.

[0039] For details, please refer to the appendix. Figure 7 As shown, the movable ring assembly 5031 includes an outer ring 5031A and an inner ring 5032B. The outer ring 5031A is movably sleeved on the connecting rod 501, and the inner ring 5032B is movably disposed in the inner cavity of the connecting rod 501. A connecting post is fixedly disposed on the inner ring 5032B. The connecting post extends out of the sliding groove 5011 opened on the connecting rod 501 and is fixedly connected to the outer ring 5031A. The inner ring 5032B is also threadedly sleeved on the screw rod 5032.

[0040] When the screw 5032 rotates, the inner ring 5032B is limited by the connecting column through the sliding groove 5011, so that the inner ring 5032B can only slide along the sliding groove 5011 when the screw 5032 rotates, thereby driving the outer ring 5031A to slide on the connecting rod 501, thereby compressing the elastic element 502.

[0041] In use, hold the rotating drum 5033 and rotate it. The rotating drum 5033 drives the screw 5032 to rotate synchronously. The rotation of the screw 5032 drives the outer ring 5031A and the inner ring 5032B to slide synchronously on the slide groove 5011. This causes the outer ring 5031A to compress the elastic element 502, thereby pushing the second gear sleeve 404 closer to the first gear sleeve 403 and finally meshing with it. During this process, the deformation of the elastic element 502 is adjusted by using the outer ring 5031A and the inner ring 5032B, thereby correspondingly adjusting the magnitude of the elastic force that the second gear sleeve 404 needs to overcome when moving away from the first gear sleeve 403. The magnitude of this elastic force is proportional to the corresponding torque value.

[0042] In this embodiment of the application, the bottom of the third sleeve 405 is also provided with a plurality of circular marks 4052, which represent different torque values. The rotating cylinder 5033 is integrally provided with a pointer 5033A, which is used in conjunction with the marks 4052 to preset the torque value when tightening.

[0043] When the rotating drum 5033 is rotated, the pointer 5033A on the drum 5033 will rotate with the drum 5033, and thus point to different marks 4052, thereby achieving the preset target torque value. When the mark 4052 pointed to by the pointer 5033A reaches the preset torque value, the rotation of the drum 5033 is stopped. At this time, the torque value on the mark 4052 pointed to by the pointer 5033A is the preset torque value. During this adjustment process, the drum 5033 drives the outer ring 5031A to slide on the connecting rod 501 and compress the elastic element 502. The compression amount of the elastic element 502 corresponds to the preset torque value.

[0044] When pointer 5033A points to the set torque value, since there is no limiting device on the rotating drum 5033, the rotating drum 5033 will rotate relative to the bottom of the third sleeve 405 under the action of external force, and thus cannot ensure the preset torque value. Therefore, this embodiment also provides a positioning component 6 to limit the rotating drum 5033 and ensure that it can be fixed relative to the third sleeve 405.

[0045] For details, please refer to the appendix. Figure 8 As shown, the positioning assembly 2 includes a positioning plate 201, a bolt 202, and a clamping block 203. One end of the positioning plate 201 is vertically fixed to the bottom of the third sleeve 405. The bolt 202 is threaded through the positioning plate 201. The clamping block 203 is rotatably connected to the end of the bolt 202 through a bearing. The clamping block 203 and the clamping sleeve 5034 fixedly sleeved at the end of the rotating cylinder 5033 are mutually pressed and fixed.

[0046] When positioning the rotating drum 5033 is required, the bolt 202 is manually tightened. The bolt 202 moves relative to the positioning plate 201, simultaneously causing the clamping block 203 to rotate and move forward. When the clamping block 203 contacts and presses against the surface of the clamping sleeve 5034, due to the friction between the clamping sleeve 5034 and the clamping block 203, the bolt 202 is further tightened. The bolt 202 rotates relative to the clamping block 203, further pushing the clamping block 203 to press against the clamping sleeve 5034, thus achieving a fixed connection between the rotating drum 5033 and the third sleeve 405. The clamping sleeve 5034 can be made of a non-metallic material with a high coefficient of friction and wear resistance, such as rubber, polyurethane, or engineering plastics. These materials can generate a large static friction force when under pressure, effectively preventing relative movement between the clamping sleeve 5034 and the clamping block 203. The corresponding clamping block 203 can also be made of silicone.

[0047] The operating principle of this embodiment of an overload-resistant adjustable torque wrench suitable for confined spaces is as follows: Rotating the rotating cylinder 5033 located on the outer side of the bottom of the third sleeve 405 causes the screw 5032 to rotate synchronously. The rotation of the screw 5032 drives the outer ring 5031A and the inner ring 5032B to slide synchronously on the slide groove 5011, thereby causing the outer ring 5031A to move on the connecting rod 501 and compress the elastic element 502. This pushes the second gear sleeve 404 closer to the first gear sleeve 403 through the elastic element 502, and finally meshes with the first gear sleeve 403. At this time, the elastic element 502 is in a compressed state. The target torque (the spring compression is proportional to the torque) can be preset by the degree of compression of the elastic element 502, avoiding the problems of over-tightening or insufficient tightening force.

[0048] The working principle of the overload-resistant adjustable torque wrench of the present invention, which is suitable for use in confined spaces, is as follows: when it is necessary to tighten the fastener, first insert the mounting connector 301 into the tightening head that is compatible with the fastener. The tightening head can also be connected to the mounting connector 301 by magnetic attraction.

[0049] Next, according to the preset target torque value of the fastener, the rotating drum 5033 is rotated. The pointer 5033A on the rotating drum 5033 will rotate with the rotating drum 5033 and point to different marks 4052, thus realizing the preset target torque value. During this process, the rotating drum 5033 synchronously drives the outer ring 5031A to slide on the connecting rod 501 and compress the elastic element 502. The compression amount of the elastic element 502 corresponds to the preset torque value. That is, when the pointer 5033A points to the preset target torque value, the compression amount of the elastic element 502 at this time corresponds to the target torque value. Then manually tighten the bolt 202. The bolt 202 moves relative to the positioning plate 201 and simultaneously drives the clamping block 203 to rotate and move forward. Finally, the clamping block 203 presses against the clamping sleeve 5034, realizing the fixed connection between the rotating drum 5033 and the third sleeve 405. This ensures that the rotating drum 5033 will not rotate during use, thereby avoiding changes in the preload of the elastic element 502 and causing the torque setting value to drift.

[0050] Then, the operator manually rotates the third sleeve 405, which drives the second gear sleeve 404 to rotate synchronously. The second gear sleeve 404 then drives the first gear sleeve 403 to rotate synchronously. The first gear sleeve 403 drives the worm 402 to rotate, which in turn drives the worm wheel body 401 to rotate. The rotation of the worm wheel body 401 drives the mounting shaft to rotate, which in turn drives the mounting joint 301 to rotate, thus tightening the tightening head. Once the tightening head is tightened, the entire assembly consisting of the worm wheel body 401, the worm 402, and the first gear sleeve 403 stops rotating. As the second gear sleeve 404 continues to be turned, the teeth on the second gear sleeve 404 will slide relative to the tooth side of the first gear sleeve 403, thereby squeezing the tooth side of the second gear sleeve 404, causing the second gear sleeve 404 to move away from the first gear sleeve 403 and slide down relative to the third sleeve 405, squeezing the elastic element 502, and finally causing the first gear sleeve 403 and the second gear sleeve 404 to disengage. This achieves the goal of disengaging the first gear sleeve 403 and the second gear sleeve 404 when the torque exceeds the preset target torque value, avoiding the problem of over-tightening the turning head or insufficient tightening force.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An overload-resistant adjustable torque wrench suitable for confined spaces, comprising an assembly housing (1), characterized in that, Also includes: The quick-connect connector (3) has one end that rotates through the assembly housing (1) and the other end that connects to the fastener to be operated. The extrusion assembly (4) is connected to the assembly housing (1) and sleeved on the quick connector (3) for driving the quick connector (3) to rotate, and at the same time can prevent over-tightening. The torque adjustment mechanism (5) is connected at one end to the extrusion assembly (4) and at the other end through the extrusion assembly (4) for adjusting the tightening torque.

2. The overload-resistant adjustable torque wrench suitable for confined spaces according to claim 1, characterized in that, The extrusion assembly (4) includes: The worm gear body (401) is rotatably disposed inside the assembly housing (1) and sleeved on the quick-connect connector (3); The worm gear unit is rotatably inserted into the assembly housing (1) and meshes with the worm wheel body (401); The transmission unit is coaxially arranged with the worm gear unit and works together to drive the worm gear unit to rotate.

3. The overload-resistant adjustable torque wrench suitable for confined spaces according to claim 2, characterized in that, The worm gear unit includes: The worm gear (402) is inserted into the assembly housing (1). The first gear sleeve (403) is connected to the end of the worm (402), and the other end is engaged with the transmission unit.

4. The overload-resistant adjustable torque wrench suitable for confined spaces according to claim 3, characterized in that, The transmission unit includes: The second gear sleeve (404) meshes with the first gear sleeve (403); The third sleeve (405) is fitted onto the outer circumference of the second gear sleeve (404).

5. The overload-resistant adjustable torque wrench suitable for confined spaces according to claim 3, characterized in that, The torque adjustment mechanism (5) includes: The connecting rod (501) is a hollow structure. One end of the connecting rod (501) is connected to the inner cavity of the first gear sleeve (403), and the other end passes through the second gear sleeve (404) and the third sleeve (405) in sequence. The elastic element (502) is sleeved on the connecting rod (501), and one end is connected to the second gear sleeve (404); The extrusion assembly (503) is sleeved on the connecting rod (501) and slides through the connecting rod (501), while abutting against the other end of the elastic member (502).

6. The overload-resistant adjustable torque wrench suitable for confined spaces according to claim 5, characterized in that, The extrusion assembly (503) includes: The movable ring assembly (5031) is movably sleeved on the connecting rod (501) and is used in conjunction with the sliding groove (5011) provided on the connecting rod (501); The screw (5032) is located in the inner cavity of the connecting rod (501), and one end of the screw thread passes through the movable ring assembly (5031). The rotating drum (5033) is connected to the other end of the screw (5032) and is rotatably connected to the end of the connecting rod (501).

7. The overload-resistant adjustable torque wrench suitable for confined spaces according to claim 6, characterized in that, The moving ring assembly (5031) includes: The outer ring (5031A) is sleeved on the connecting rod (501); The inner ring (5032B) is movably disposed in the inner cavity of the connecting rod (501) and is connected to the outer ring (5031A) through the slide groove (5011). At the same time, the inner ring (5032B) is threaded onto the screw (5032).

8. The overload-resistant adjustable torque wrench suitable for confined spaces according to claim 4, characterized in that, The wrench also includes: The positioning component (2) is located at the bottom of the third sleeve (405) and is used to limit the torque adjustment mechanism (5).

Images