Ratchet head with large torque and small rotation angle
By adopting a combined structure of internal teeth unidirectional arrangement, support symmetrical arrangement, square tenon limit and annular elastic parts in the ratchet head, the problem that existing ratchet heads are difficult to withstand large torque and small slewing angles at the same time is solved, and efficient torque transmission and stable structure are achieved.
Patent Information
- Application Number
- CN202420913936.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-28
AI Technical Summary
The ratchet heads in existing ratchet wrenches are difficult to withstand large torque and small slewing angles at the same time, and cannot meet the needs of most torque wrenches.
A ratchet head with large torque and small rotation angle is designed, and a combined structure of internal teeth unidirectional arrangement, support teeth symmetrical arrangement, square tenon limit position and annular elastic parts are used to improve torque transmission efficiency and structural stability.
By increasing the number of internal teeth and supporting teeth design, the rotation angle is reduced, the torque transmission efficiency and structural stability are improved, and the demand for large torque and small rotation angles is met.
Smart Images
Figure CN222589570U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of ratchet heads for ratchet wrenches, and in particular to a ratchet head with large torque and small rotation angle. Background Art
[0002] A ratchet wrench is a manual screw tightening tool, consisting of a handle, ratchet head, piston, gear, pin and spring. This wrench connects the main and secondary plum blossom sleeves of different sizes by engaging the female and male keys of the hinge key, so that it can be used to tighten and loosen screws of two sizes, thereby expanding the scope of use and saving raw materials and labor costs. The ratchet head is an important component of the ratchet wrench.
[0003] In the torque industry, the ratchet head used in its ratchet wrench is very different from the ratchet head used in the commonly used ratchet wrench in terms of requirements. The ratchet head is required to be able to withstand a larger torque while having a smaller rotation angle.
[0004] Therefore, it is necessary to provide a ratchet head with large torque and small rotation angle, which can meet the needs of most torque wrenches. Utility Model Content
[0005] In order to improve the problems existing in the above-mentioned prior art, the present application provides a ratchet head with large torque and small rotation angle.
[0006] The present application provides a ratchet head with large torque and small rotation angle, which adopts the following technical solution:
[0007] A ratchet head with large torque and small rotation angle comprises a ratchet head body, the inner teeth of the ratchet head body are unidirectionally arranged, a ratchet is arranged in the ratchet head body, a circumferential array of the ratchet is provided with symmetrically arranged supporting teeth, the supporting teeth cooperate with the inner teeth of the ratchet head body, the supporting teeth are rotatably arranged with the ratchet, and a square tenon is provided in the axial direction of the ratchet.
[0008] Preferably, the number of internal teeth in the ratchet head body is 20-30, and the number of internal teeth in the ratchet head body is divisible by 4.
[0009] By adopting the above technical solution, the number of internal teeth in the ratchet head body is increased, and the torque transmission efficiency can be improved. At the same time, the internal teeth in the ratchet head body are set in a unidirectional manner, and the force-bearing surface is large. When the supporting teeth rotate, the resistance between the internal teeth and the supporting teeth is small due to the large slope, thereby effectively improving the torque of the ratchet head.
[0010] Preferably, there are four support teeth in total, two of which form a group, and the two groups of support teeth are respectively located on the 90° cross line and the 180° cross line.
[0011] By adopting the above technical solution, the teeth are arranged into four groups, two of which are arranged in a cross shape. Taking the ratchet head body with 20 internal teeth as an example, the angle of one tooth is 360 / 20=18°, and the half tooth angle is 9°. This design effectively reduces the rotation angle of the ratchet head, making it easier to operate in a narrow space.
[0012] Preferably, the square tenon is a long strip structure, and the square tenon is slidably arranged in the middle of the ratchet and is limited and fixed by a fastener.
[0013] By adopting the above technical solution, the square tenon with a long strip structure can effectively facilitate the up and down movement of the square tenon, thereby facilitating the adjustment and switching between clockwise operation and counterclockwise operation.
[0014] Preferably, a mounting groove is circumferentially provided in the middle of the supporting tooth along the circumferential direction of the ratchet, and an annular elastic member is arranged in the mounting groove, and the annular elastic member continuously applies radial elastic force to the supporting tooth.
[0015] By adopting the above technical scheme, the annular elastic member is used to continuously apply radial elastic force to the support teeth, so that after the support teeth are tightened toward the center by the elastic force of the annular elastic member, one corner of the installation groove is continuously stressed, so that the force-bearing end of the support teeth is always tilted, thereby ensuring that a group of support teeth will eventually fall into the bottom of the inner teeth of the ratchet head body, and are always in a working state, effectively improving the stability of the structure.
[0016] Preferably, the annular elastic member is an elastic steel wire ring, and the annular elastic member is embedded in the installation groove.
[0017] By adopting the above technical solution, the stability of the tooth support during the working process is further improved.
[0018] Preferably, there is a broken end on the annular elastic member, and a limiting member is provided at the broken end of the annular elastic member circumferentially of the ratchet, and the limiting member is used to separate the broken end of the annular elastic member and prevent the annular elastic member from circumferentially rotating.
[0019] By adopting the above technical solution, the broken end of the annular elastic member is separated by a limiter to prevent the annular elastic member from rotating with the ratchet, thereby preventing the broken end of the annular elastic member from falling on the slope of the tooth support groove, thereby ensuring stability during work.
[0020] Preferably, the limiting member comprises a fixing bolt, the fixing bolt is arranged along the radial direction of the ratchet, and the fixing bolt is threadedly connected to the ratchet.
[0021] By adopting the above technical solution, the annular elastic member is separated by the fixing bolts, thereby facilitating the disassembly of the limiting member.
[0022] Preferably, an annular positioning piece is provided between the ratchet head body and the ratchet, and spiral retaining rings are respectively provided between the positioning piece and both ends of the ratchet.
[0023] By adopting the above technical solution, the stability between the ratchet head body and the ratchet is further improved.
[0024] In summary, the present application includes at least one of the following beneficial technical effects:
[0025] 1. By increasing the number of internal teeth in the ratchet head body, the torque transmission efficiency can be improved. At the same time, the internal teeth in the ratchet head body are set in a unidirectional manner, and the force-bearing surface is large. When the teeth rotate, the resistance between the internal teeth and the teeth is small due to the large slope, thereby effectively improving the torque of the ratchet head;
[0026] 2. By setting the teeth into four, two in each group, and setting them in a cross pattern. Taking the ratchet head body with 20 internal teeth as an example, the angle of one tooth is 360 / 20=18°, and the half tooth angle is 9°. This design effectively reduces the rotation angle of the ratchet head, making it easier to operate in a narrow space;
[0027] 3. The annular elastic member is used comprehensively to continuously apply radial elastic force to the support teeth, so that after the support teeth are tightened toward the center by the elastic force of the annular elastic member, one corner of the installation groove is continuously stressed, so that the force-bearing end of the support teeth is always tilted, thereby ensuring that a group of support teeth will eventually fall into the bottom of the inner teeth of the ratchet head body, and thus are always in a working state, effectively improving the stability of the structure.
[0028] 4. Use the limiter to separate the broken end of the annular elastic member to prevent the annular elastic member from rotating with the ratchet, thereby preventing the broken end of the annular elastic member from falling on the slope of the tooth support socket, thereby ensuring stability during the working process. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 This is a schematic diagram mainly showing the overall structure of the ratchet head in this embodiment;
[0030] Figure 2 This is a vertical cross-sectional view mainly showing the ratchet head structure of this embodiment;
[0031] Figure 3 This is a transverse cross-sectional view mainly showing the structure of the ratchet head in this embodiment;
[0032] Figure 4 Schematic diagram of the ratchet structure of this embodiment.
[0033] Figure numerals: 1, ratchet head body; 2, internal teeth; 3, ratchet; 4, support teeth; 5, square tenon; 6, mounting groove; 7, annular elastic member; 8, tightening bolt; 9, positioning plate; 10, spiral retaining ring. DETAILED DESCRIPTION
[0034] The present application is further described in detail below in conjunction with the accompanying drawings.
[0035] The embodiment of the present application discloses a ratchet head with high torque and small rotation angle.
[0036] Reference Figure 1 and Figure 2 The ratchet head with large torque and small rotation angle includes a ratchet head body 1, a ratchet 3 is arranged in the ratchet head body 1, a square tenon 5 is arranged in the axial direction of the ratchet 3, an annular positioning piece 9 is arranged between the ratchet head body 1 and the ratchet 3, and spiral retaining rings 10 are respectively arranged between the positioning piece 9 and the two ends of the ratchet 3. The setting of the positioning piece 9 and the spiral retaining ring 10 improves the stability between the ratchet head body 1 and the ratchet 3.
[0037] Specifically, since this embodiment is a one-way ratchet, the square tenon 5 can be a long strip structure, a through hole is opened in the middle shaft of the ratchet 3, and the square tenon 5 is slidably arranged in the through hole of the ratchet 3 and is fixed by a fastener. The fastener can be a common bolt structure (not shown in the figure). The setting of the square tenon 5 with a long strip structure can make the square tenon 5 move up and down, thereby facilitating the adjustment and switching between clockwise operation and counterclockwise operation.
[0038] Reference Figure 2 and Figure 3 The inner teeth 2 of the ratchet head body 1 are arranged unidirectionally, and the ratchet 3 is provided with symmetrically arranged supporting teeth 4 in a circumferential array, wherein the supporting teeth 4 cooperate with the inner teeth 2 of the ratchet head body 1. Since the inner teeth in the ratchet head body are arranged unidirectionally, the force-bearing surface is large, and the resistance between the inner teeth and the supporting teeth is small due to the large slope when the supporting teeth rotate, thereby effectively improving the torque of the ratchet head.
[0039] Reference Figures 2 to 4 Specifically, the tooth 4 is rotatably arranged between the ratchet 3, and the middle part of the tooth 4 is provided with a mounting groove 6 along the circumference of the ratchet 3, and an annular elastic member 7 is arranged in the mounting groove 6. The annular elastic member 7 continuously applies radial elastic force to the tooth 4, and the annular elastic member 7 continuously applies radial elastic force to the tooth 4, so that after the tooth 4 is tightened toward the center by the elastic force of the annular elastic member 7, one corner of the mounting groove 6 is continuously stressed, so that the stressed end of the tooth 4 is always tilted, so as to ensure that a group of teeth 4 eventually falls into the bottom of the inner teeth 2 of the ratchet head body 1, and is always in a working state, effectively improving the stability of the structure. In this embodiment, the annular elastic member 7 adopts an elastic wire ring with a broken end.
[0040] For further explanation, see Figure 3 and Figure 4 The ratchet 3 is provided with a limiter at the broken end of the annular elastic member 7 in the circumferential direction, and the limiter is used to separate the broken end of the annular elastic member 7 to prevent the annular elastic member 7 from rotating in the circumferential direction. The limiter is used to separate the broken end of the annular elastic member 7, so as to prevent the annular elastic member 7 from rotating with the ratchet 3, and further prevent the broken end of the annular elastic member 7 from falling on the slope of the groove of the supporting tooth 4.
[0041] Specifically, the limiting member can be a set bolt 8, which is arranged along the radial direction of the ratchet 3, and the set bolt 8 is threadedly connected to the ratchet 3. The convenience of installing the set bolt 8 is effectively improved.
[0042] Reference Figure 3 In this embodiment, the number of the inner teeth 2 in the ratchet head body 1 can be 20-30, and the number of the inner teeth 2 in the ratchet head body 1 can be divisible by 4. Specifically, the number of the specific number of teeth can be determined according to the size of the square tenon 5.
[0043] Reference Figure 3 There are four support teeth 4 in total, with two support teeth 4 forming a group, and the two groups of support teeth 4 are respectively located on the 90° cross line and the 180° cross line.
[0044] Further explanation, the present application sets four teeth 4, two of which form a group and are arranged in a cross shape. Taking the ratchet head body 1 as an example, the internal teeth 2 are set with 20 teeth, and then it can be concluded that the angle of each tooth angle is 360 / 20=18°, and then the angle of half the tooth angle is 9°. This design effectively reduces the rotation angle of the ratchet head 3, and to a certain extent, the rotation angle can be reduced by half, which is convenient for operation in a small space.
[0045] The implementation principle of a ratchet head with large torque and small rotation angle in the embodiment of the present application is as follows: the inner teeth 2 in the ratchet head body 1 are unidirectionally arranged, and the force-bearing surface thereof is large. When the supporting teeth 4 rotate, the resistance between the inner teeth 2 and the supporting teeth 4 is small due to the large slope, thereby effectively increasing the torque of the ratchet 3 head;
[0046] Taking the ratchet head body 1 with 20 teeth as an example, the tooth angle is 360 / 20=18°, and the half tooth angle is 9°. This design effectively reduces the rotation angle of the ratchet head 3.
[0047] The annular elastic member 7 is used to continuously apply radial elastic force to the support teeth 4, so that after the support teeth 4 are tightened toward the center by the elastic force of the annular elastic member 7, one corner of the mounting groove 6 is continuously stressed, so that the force-bearing end of the support teeth 4 is always tilted, thereby ensuring that a group of support teeth 4 eventually falls into the bottom of the inner teeth 2 of the ratchet head body 1, and is always in a working state.
[0048] 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 ratchet head with large torque and small rotation angle, characterized in that: The invention comprises a ratchet head body (1), wherein the inner teeth (2) of the ratchet head body (1) are arranged unidirectionally, a ratchet (3) is arranged inside the ratchet head body (1), a circumferential array of symmetrically arranged supporting teeth (4) is arranged, the supporting teeth (4) cooperate with the inner teeth (2) of the ratchet head body (1), the supporting teeth (4) and the ratchet (3) are rotatably arranged, and a square tenon (5) is arranged in the axial direction of the ratchet (3).
2. A ratchet head with large torque and small rotation angle according to claim 1, characterized in that: The number of the internal teeth (2) in the ratchet head body (1) is 20-30, and the number of the internal teeth (2) in the ratchet head body (1) is divisible by 4.
3. A ratchet head with large torque and small rotation angle according to claim 2, characterized in that: A total of four support teeth (4) are provided, with two support teeth (4) forming a group, and the two groups of support teeth (4) are respectively located on the 90° cross line and the 180° cross line.
4. The ratchet head with large torque and small rotation angle according to claim 1, characterized in that: The square tenon (5) is a long strip structure, and the square tenon (5) is slidably arranged in the middle of the ratchet (3) and is fixed in position by a fastener.
5. The ratchet head with large torque and small rotation angle according to claim 1, characterized in that: A mounting groove (6) is provided in the middle of the support tooth (4) along the circumferential direction of the ratchet (3), and an annular elastic member (7) is arranged in the mounting groove (6). The annular elastic member (7) continuously applies a radial elastic force to the support tooth (4).
6. A ratchet head with large torque and small rotation angle according to claim 5, characterized in that: The annular elastic member (7) is an elastic steel wire ring, and the annular elastic member (7) is embedded in the installation groove (6).
7. A ratchet head with large torque and small rotation angle according to claim 6, characterized in that: There is a broken end on the annular elastic member (7), and a limiting member is provided at the broken end of the annular elastic member (7) in the circumferential direction of the ratchet (3), wherein the limiting member is used to separate the broken end of the annular elastic member (7) and prevent the annular elastic member (7) from rotating in the circumferential direction.
8. The ratchet head with large torque and small rotation angle according to claim 7, characterized in that: The limiting member comprises a fixing bolt (8), the fixing bolt (8) being arranged along the radial direction of the ratchet (3), and the fixing bolt (8) and the ratchet (3) being threadedly connected.
9. A ratchet head with large torque and small rotation angle according to any one of claims 1 to 8, characterized in that: An annular positioning piece (9) is provided between the ratchet head body (1) and the ratchet (3), and spiral retaining rings (10) are respectively provided between the positioning piece (9) and both ends of the ratchet (3).