High-precision mechanical torque wrench
By designing a high-precision torque wrench including a working head, a rod body and a gripping assembly, the problem that existing torque wrench is affected by the change in force point during use is solved, and higher torque accuracy and bolt tightening accuracy are achieved.
Patent Information
- Application Number
- CN202421784492.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-25
AI Technical Summary
During the use of existing torque wrench, the change in the force point on the handle affects the torque accuracy, making it difficult to ensure the accuracy of bolt tightening.
A high-precision mechanical torque wrench is designed, adopting the structure of the working head, rod body and grip assembly. Through the combination of O-shaped rubber ring, central ring and handle, the effective force arm of the working head is kept within the force range, reducing the change in the force point and improving the accuracy of torque.
By reducing the change in the effective force arm, the accuracy of the torque wrench is improved, the accuracy of the bolt is enhanced, and the sealing effect of the O-ring prevents debris from entering.
Smart Images
Figure CN222843991U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of torque wrenches, and in particular to a high-precision mechanical torque wrench. Background Art
[0002] Commercially available mechanical torque wrenches, such as Figure 1 As shown, the torque wrench generally consists of a wrench body 102, a kingpin 101, a tube 103, an internal spring 104, a release mechanism, an adjustment mechanism 105 and a handle 106; the wrench body 102 and the tube 103 are connected through the kingpin 101, the adjustment mechanism 105 is used to adjust the length of the tube 103, one end of the spring 104 is connected to one end of the adjustment mechanism 105, and the other end of the spring 104 is connected to the release mechanism.
[0003] Torque wrenches are commonly used tools for tightening bolts. With the rise of high-end manufacturing, bolts of different specifications in various occasions have different torque requirements, and the accuracy of torque is getting higher and higher. However, we found that during use, the change of the force point on the handle directly affects the accuracy of torque, making it difficult to ensure the accuracy of bolt tightening. Although it is generally stipulated that the force point of the effective force arm should be in the center of the handle and there will usually be a mark, it is actually difficult to do. Utility Model Content
[0004] In order to improve the problem of different force points on the handle during use, which affects the torque accuracy, the present application provides a high-precision mechanical torque wrench.
[0005] The present application provides a high-precision mechanical torque wrench adopts the following technical solution:
[0006] A high-precision mechanical torque wrench comprises a working head, a rod body and a gripping assembly; the working head is arranged at one end of the rod body; the gripping assembly is sleeved on the end of the rod body away from the working head, and is used to keep the effective force arm of the working head within the force application range; wherein the gripping assembly comprises an O-shaped rubber ring, a center ring and a handle; the center ring is fixed to the rod body, a gap is formed between the handle and the rod body, the handle and the center ring are threadedly connected, and the O-shaped rubber ring is installed in the gap.
[0007] By adopting the above technical solution, the working head cover is arranged on the bolt to be tightened, the handle is held manually, and the range of the manual force application point is within a range with smaller changes. The change of its effective force arm is small, thereby obtaining a relatively high-precision torque, which helps to improve the accuracy of bolt tightening. The O-ring has a good sealing effect to prevent debris from entering the gap.
[0008] Optionally, the center ring and the rod body are integrally formed by laser welding.
[0009] By adopting the above technical solution, the center ring and the rod body are formed in one piece, which makes it easy to determine the force point from the center line of the center ring.
[0010] Optionally, a set screw passes through the handle, and the set screw passing through the handle abuts against the rod body.
[0011] By adopting the above technical solution, the set screw is screwed into the handle, which reduces the occurrence of the handle sliding off the center ring and improves the stability between the handle and the center ring.
[0012] Optionally, the outer diameter of the center ring is provided with an external thread, and the interior of the handle is provided with an internal thread that matches the external thread.
[0013] By adopting the above technical solution, the external thread on the center ring and the internal thread of the inner hole of the handle cooperate with each other, thereby improving the firmness between the center ring and the handle.
[0014] Optionally, there are two O-shaped rubber rings, and the two O-shaped rubber rings are respectively located at two ends of the gap.
[0015] By adopting the above technical solution, the O-shaped rubber rings are located at both ends of the gap, thereby sealing both ends of the gap, preventing external debris from entering from the gaps on both sides, and improving the sealing between the center ring and the handle.
[0016] Optionally, the working head and the rod body are connected via a pin.
[0017] By adopting the above technical solution and using a static fixed connection, the disassembly between the working head and the rod body is facilitated.
[0018] Optionally, the handle is made of alloy steel, and the rod body is made of alloy steel.
[0019] By adopting the above technical solution, the handle and the rod body maintain good rigidity, and the alloy steel used has good strength and toughness, which is conducive to the long-term use of the rod body.
[0020] Optionally, the surface of the handle is formed with anti-slip patterns for increasing friction.
[0021] By adopting the above technical solution, the relative sliding between the hand and the handle is reduced.
[0022] Optionally, a threaded hole for a set screw to pass through is provided on the handle, and the threaded hole is located at one end of the center circle close to the working head.
[0023] By adopting the above technical solution, the handle can be easily kept balanced after being locked.
[0024] In summary, the present application includes at least one of the following beneficial technical effects:
[0025] 1. The force application point is located in a small range of variation, and the effective force arm changes little, which effectively improves the accuracy of the torque wrench, reduces the error of the torque generated by the force arm and force, and improves the accuracy of bolt tightening;
[0026] 2. The O-shaped rubber rings at both ends of the gap help to seal the gap formed by the center ring and the handle, reducing the occurrence of debris entering the gap. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0028] Figure 1 It is a structural schematic diagram of the present application showing the prior art.
[0029] Figure 2 This is a schematic diagram showing different force application points in this application.
[0030] Figure 3 This is a schematic diagram showing the overall structure of this application.
[0031] Figure 4 This is a schematic diagram showing the partial structure of the gripping component of this application.
[0032] Figure numerals: 1. working head; 2. rod body; 3. O-ring; 4. center ring; 5. handle; 6. gap; 7. set screw; 8. pin; 9. anti-slip pattern; 101. main pin; 102. wrench body; 103. tube; 104. spring; 105. adjustment mechanism; 106. handle; 107. release mechanism. DETAILED DESCRIPTION
[0033] The following is combined with Figure 2-4 This application is described in further detail.
[0034] The embodiment of the present application discloses a high-precision mechanical torque wrench.
[0035] Reference Figure 2 A high-precision mechanical torque wrench comprises a working head 1, a rod body 2 and a gripping assembly; the working head 1 is arranged at one end of the rod body 2; the gripping assembly is sleeved at the end of the rod body 2 away from the working head 1, and is used to keep the effective force arm of the working head 1 within the force application range; the working head 1 and the rod body 2 are connected by a pin 8. The static fixed connection is adopted to facilitate the disassembly of the working head 1 and the rod body 2.
[0036] See also Figure 4As shown, the grip assembly includes an O-shaped rubber ring 3, a center ring 4 and a handle 5; the center ring 4 is fixed to the rod body 2. The center ring 4 and the rod body 2 of this embodiment are integrally formed by laser welding. The center ring 4 and the rod body 2 are integrally formed, which is convenient for determining the force point from the center line of the center ring 4. A gap 6 is formed between the handle 5 and the rod body 2. The handle 5 and the center ring 4 are threadedly connected, and the O-shaped rubber ring 3 is installed in the gap 6. A threaded hole for a set screw 7 to pass through is opened on the handle 5. The threaded hole is located at one end of the center ring 4 close to the working head 1, which is convenient for maintaining a good balance.
[0037] See also Figure 4 As shown, the outer diameter of the center ring 4 is provided with an external thread, and the inside of the handle 5 is provided with an internal thread adapted to the external thread. The external thread on the center ring 4 and the internal thread of the inner hole of the handle 5 cooperate with each other to improve the firmness between the center ring 4 and the handle 5.
[0038] Definition of torque: Torque = force * distance (distance perpendicular to the force);
[0039] The distance perpendicular to the force is generally called the effective force arm L.
[0040] Torque---T; Effective lever arm---L; Force---F;
[0041] The expression of torque: T=F*L;
[0042] If the force application point is close to the torque point, then since (Ld) < L, the resulting torque should be < T; similarly, if the force application point is away from the torque point, then since (L+d) > L, the resulting torque should be > T. This causes a certain error in the accuracy of the torque, which is not conducive to the precise tightening of the bolt.
[0043] See also Figure 3 and Figure 4 As shown, a set screw 7 passes through the handle 5, and the set screw 7 passing through the handle 5 abuts against the rod body 2. The set screw 7 is screwed into the handle 5, so that the handle 5 is not withdrawn from the external thread of the center ring 4, thereby improving the stability between the handle 5 and the center ring 4.
[0044] See also Figure 3 As shown, there are two O-shaped rubber rings 3, which are respectively located at the two ends of the gap 6 to seal the two ends of the gap 6, prevent external debris from entering from the gaps 6 on both sides, and improve the sealing between the center ring 4 and the handle 5.
[0045] See also Figure 3As shown, the material of the handle 5 is alloy steel, and the material of the rod body 2 is alloy steel. The handle 5 has high strength and wear resistance. The alloy steel has good strength and toughness, which is conducive to the long-term use of the rod body 2. The surface of the handle 5 is formed with anti-slip grooves 9 for increasing friction and reducing the relative sliding between the hand and the handle 5.
[0046] See also Figure 2 and Figure 3 As shown, the length of the center circle 4 of the handle 5 is a, "1 / 2a" is much smaller than "d", and the length of the entire handle 5 remains unchanged, but the force application point is fixed within a very small range of change, so that the change of the effective force arm is small, thereby obtaining a relatively high-precision torque.
[0047] The implementation principle of a high-precision mechanical torque wrench in the embodiment of the present application is as follows: compared with a conventional torque wrench, during operation, the working head 1 of the handle 5 is used to twist the bolt sleeve, and the gap 6 between the handle 5 and the center ring 4 is sealed by a sealing ring to reduce the occurrence of debris entering the gap 6. When applying force, the position of the center ring 4 is located on the center line of the handle 5, which is convenient for marking and identifying the range of applied force, shortening the range of applied force variation, reducing the change in the effective force arm, improving the accuracy of the torque wrench, and helping to improve the accuracy of bolt tightening.
[0048] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A high-precision mechanical torque wrench, characterized in that: The invention comprises a working head (1), a rod body (2) and a gripping assembly; the working head (1) is arranged at one end of the rod body (2); the gripping assembly is sleeved on an end of the rod body (2) away from the working head (1) and is used to keep the effective force arm of the working head (1) within the force application range; The grip assembly comprises an O-shaped rubber ring (3), a center ring (4) and a handle (5); the center ring (4) and the rod body (2) are fixed, a gap (6) is formed between the handle (5) and the rod body (2), the handle (5) and the center ring (4) are threadedly connected, and the O-shaped rubber ring (3) is installed in the gap (6).
2. A high-precision mechanical torque wrench according to claim 1, characterized in that: The center ring (4) and the rod body (2) are integrally formed by laser welding.
3. A high-precision mechanical torque wrench according to claim 1, characterized in that: A set screw (7) passes through the handle (5), and the set screw (7) passing through the handle (5) abuts against the rod body (2).
4. A high-precision mechanical torque wrench according to claim 1, characterized in that: The outer diameter of the center ring (4) is provided with an external thread, and the interior of the handle (5) is provided with an internal thread that matches the external thread.
5. A high-precision mechanical torque wrench according to claim 1, characterized in that: There are two O-shaped rubber rings (3), and the two O-shaped rubber rings (3) are respectively located at two ends of the gap (6).
6. A high-precision mechanical torque wrench according to claim 1, characterized in that: The working head (1) and the rod body (2) are connected via a pin shaft (8).
7. A high-precision mechanical torque wrench according to claim 1, characterized in that: The handle (5) is made of alloy steel, and the rod body (2) is made of alloy steel.
8. A high-precision mechanical torque wrench according to claim 1, characterized in that: The surface of the handle (5) is formed with anti-slip patterns (9) for increasing friction.
9. A high-precision mechanical torque wrench according to claim 3, characterized in that: The handle (5) is provided with a threaded hole for a set screw (7) to pass through, and the threaded hole is located at one end of the center circle (4) close to the working head (1).