Electronic force limiting torque wrench

Abstract

The utility model discloses an electronic force limiting torque wrench which comprises a shell, a force unloading and reducing gear set and an input strip rotatably arranged on the shell, a protrusion is arranged at the end of the input strip, and a clamping groove allowing the protrusion to be inserted is formed in an input end component of the force unloading and reducing gear set. And an input end part of the force unloading and reducing gear set is rotatably arranged on the shell. According to the electronic force-limiting torque wrench, a tooth-shaped transmission structure is changed into matching of the protrusions and the grooves, the structural strength is improved, the electronic force-limiting torque wrench is not prone to damage, the working reliability can be improved, the service life can be prolonged, the matching precision requirement can be lowered, and then the machining cost can be reduced.

Description

Electronic torque limiter Technical Field

[0001] This utility model belongs to the field of wrench technology, specifically, it relates to an electronic torque limiting wrench. Background Technology

[0002] Existing electronic force-limiting wrenches with force-reducing gear sets have a gear structure at the input end of the force-reducing gear set, which cooperates with an arc-shaped rack. Due to the tooth-shaped structure, the structural strength is weakened, making it easy to be damaged, resulting in reduced work reliability and service life. In addition, the gear matching accuracy requirement is high, which increases the processing cost.

[0003] Chinese Patent Application No. 202210883023.6 discloses a digital torque wrench, including a wrench body, a housing connected to the wrench body, a force reduction mechanism disposed within the housing, a rotatable force application handle, an arc-shaped rack disposed on the force application handle and meshing with the input end of the force reduction mechanism, and a stop pawl for locking the output end of the force reduction mechanism.

[0004] An improved electronic torque limiter is provided, particularly concerning improved operational reliability. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides an electronic torque-limiting wrench, with the purpose of improving operational reliability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an electronic torque limiting wrench, including a housing, a force-reducing gear set, and an input bar rotatably mounted on the housing. The end of the input bar is provided with a protrusion, and the input end component of the force-reducing gear set is provided with a slot for inserting the protrusion. The input end component of the force-reducing gear set is rotatably mounted on the housing.

[0007] The protrusion is a spherical or cylindrical structure.

[0008] The housing is provided with a reset spring for applying an elastic force to the input bar.

[0009] The unloading and reducing gear set includes multiple gear sets, each gear set consisting of two coaxially arranged gears. The gears of adjacent gear sets mesh to form a single-stage gear transmission mechanism.

[0010] This utility model also provides an electronic torque limiting wrench, including a housing, a force-reducing gear set, and an input bar rotatably mounted on the housing. The input end component of the force-reducing gear set is provided with a protrusion, and the input bar is provided with a slot for inserting the protrusion. The input end component of the force-reducing gear set is rotatably mounted on the housing.

[0011] The protrusion is a spherical or cylindrical structure.

[0012] The housing is provided with a reset spring for applying an elastic force to the input bar.

[0013] The force-reducing gear set includes multiple gear sets, each consisting of two coaxially arranged gears, with adjacent gear sets meshing. For two adjacent gear sets, the output gear of one gear set meshes with the input gear of the other gear set.

[0014] This utility model of an electronic torque limiting wrench improves structural strength and reduces the likelihood of damage by changing the toothed transmission structure to a combination of protrusions and grooves. This enhances operational reliability and service life, while also reducing the precision requirements for fit and consequently lowering processing costs. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following:

[0016] Figure 1 is a cross-sectional view of the electronic torque limiting wrench of Embodiment 1;

[0017] Figure 2 is another cross-sectional view of the electronic torque limiting wrench of Embodiment 1;

[0018] Figure 3 is a cross-sectional view of the electronic torque limiting wrench of Embodiment 2;

[0019] Figure 4 is another cross-sectional view of the electronic torque limiting wrench of Embodiment 2;

[0020] The markings in the diagram are as follows: 101, First rotating shaft; 2, Housing; 3, Force application handle; 4, Return spring; 5, Input bar; 6, First gear set; 7, Second gear set; 8, Third gear set; 9, Protrusion; 10, Slot; 11, Stop pawl; 12, Electronic unloading mechanism; 13, Reducer gear set; 14, Stop pawl. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0022] It should be noted that in the following embodiments, the terms "first," "second," and "third" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution; they are merely for the convenience of description.

[0023] Example 1

[0024] As shown in Figures 1 and 2, this embodiment provides an electronic torque limiting wrench, including a wrench head, a housing 2, a force application handle 3, a stop pawl 11, a force reduction gear set, and an input bar 5 rotatably mounted on the housing 2. The end of the input bar 5 has a protrusion 9, and the input end component of the force reduction gear set has a slot 10 for inserting the protrusion 9. The input end component of the force reduction gear set is rotatably mounted on the housing 2.

[0025] Specifically, as shown in Figures 1 and 2, the housing 2 is a hollow tubular structure. The wrench head is located outside the housing 2. The input bar 5 is mounted on the housing 2 via the first rotating shaft 1. The stop pawl 11 and the force-reducing gear set are located inside the housing 2, between the stop pawl 11 and the input bar 5. Strain gauges are installed on both sides of the input bar 5. The force-applying handle 3 is fixedly connected to the input bar 5 and is located outside the housing 2. The force-applying handle 3 is for the operator to grip. The stop pawl 11 is mounted on the housing 2 via the second rotating shaft. The stop pawl 11 has stop teeth for engaging in the tooth grooves of the output end component of the force-reducing gear set. After the stop teeth on the stop pawl 11 engage in the tooth grooves of the output end component of the force-reducing gear set, the force-reducing gear set cannot rotate, preventing the input bar 5 and the wrench head from rotating around the rotating shaft, allowing the wrench to perform tightening operations. When the tightening torque reaches the preset value, the stop teeth on the stop pawl 11 disengage from the output end component of the force reduction mechanism, and the operating force applied to the force application handle 3 is transmitted to the input end of the force reduction gear set through the input bar 5, so that the force reduction gear set can rotate freely and remove the operating force acting on the force application handle 3.

[0026] As shown in Figures 1 and 2, the input end component is an incomplete gear. The slot 10 is a groove provided on the outer circular surface of the input end component. No teeth are provided on this outer circular surface of the input end component. The protrusion 9 is a spherical or cylindrical structure, and is fixedly connected to one end of the input bar 5 along its length, with both being integrally machined. By changing the existing toothed transmission structure to a fit between the protrusion 9 and the groove, and reducing the number of teeth on the input bar 5 and the input end component, the structural strength of the input bar 5 and the input end component can be improved, making them less prone to damage, increasing operational reliability and service life. Furthermore, the required precision of the fit can be reduced, thereby lowering manufacturing costs. When the input bar 5 rotates, the protrusion 9 drives the input end component to rotate synchronously.

[0027] As shown in Figures 1 and 2, a return spring 4 is provided on the housing 2 to apply an elastic force to the input bar 5. The return spring 4 is located inside the housing 2 and is a cylindrical helical spring and a compression spring. The return spring 4 is clamped between the input bar 5 and the inner wall of the housing 2. The elastic force applied by the return spring 4 to the input bar 5 allows the input bar 5 to rotate. The return spring 4 is used to reset the input bar 5, the force application handle 3, and the force reduction gear set, preparing for the next tightening operation.

[0028] In this embodiment, as shown in Figures 1 and 2, the force-reducing gear set includes a first gear set 6, a second gear set 7, and a third gear set 8. The first gear set 6 meshes with the input end component, and the second gear set 7 is located between the first gear set 6 and the third gear set 8. The first gear set 6 and the third gear set 8 are fixed gear sets. The first gear set 6 includes a first input gear and a first output gear. The diameter of the first input gear is smaller than the diameter of the first output gear. The first input gear and the first output gear are coaxially and fixedly connected. The first input gear and the first output gear are mounted on a first shaft. The first input gear meshes with the input end component, and the first output gear meshes with the first gear 8, forming a single-stage gear transmission mechanism. The second gear set 7 includes a second input gear and a second output gear. The diameter of the second input gear is smaller than the diameter of the second output gear. The second input gear and the second output gear are coaxially and fixedly connected. The second input gear and the second output gear are mounted on a second shaft. The second input gear meshes with the input end component, and the first output gear meshes with the second input gear, forming a single-stage gear transmission mechanism.

[0029] The third gear set 8 includes a third input gear and a third output gear. The diameter of the third input gear is smaller than that of the third output gear. The third input gear and the third output gear are coaxially fixedly connected and mounted on the third shaft. The third input gear meshes with the second output gear to form a single-stage gear transmission mechanism. The third output gear meshes with the stop pawl 11, and the stop teeth on the stop pawl 11 can be engaged in the tooth grooves on the third output gear. The axes of the first shaft, the second shaft, the third shaft, the first rotating shaft 1, and the second rotating shaft are parallel. The second gear set 7 is a one-way gear set. A one-way mechanism is mounted on the second shaft. The one-way mechanism is located between the first gear and the second shaft or between the second gear and the second shaft. The one-way mechanism is a one-way bearing or a one-way ratchet.

[0030] Example 2

[0031] The main difference between this embodiment and Embodiment 1 is the different positions of the protrusion 9 and the slot 10.

[0032] As shown in Figures 3 and 4, in this embodiment, a protrusion 9 is provided on the input end component of the unloading and reducing gear set, and a slot 10 is provided on the input bar 5 for inserting the protrusion 9. When the input bar 5 rotates, the protrusion 9 drives the input end component to rotate synchronously.

[0033] As shown in Figures 3 and 4, the input end component is an incomplete gear. The protrusion 9 is located on the outer circular surface of the input end component, without any teeth. The protrusion 9 is a spherical or cylindrical structure and is fixedly connected to the input end component, with both being integrally machined. The slot 10 is a groove located at the end of the input bar 5. By changing the existing toothed transmission structure to a fit between the protrusion 9 and the groove, and reducing the number of teeth on the input bar 5 and the input end component, the structural strength of the input bar 5 and the input end component can be improved, making them less prone to damage, increasing operational reliability and service life. Furthermore, the required precision of the fit can be reduced, thereby lowering manufacturing costs.

[0034] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An electronic torque limiting wrench, comprising a housing, a force-relieving and force-reducing gear set, and an input bar rotatably mounted on the housing, characterized in that: The input bar has a protrusion at its end, and the input end component of the unloading and reducing gear set has a slot for inserting the protrusion. The input end component of the unloading and reducing gear set is rotatably mounted on the housing.

2. The electronic torque limiting wrench according to claim 1, characterized in that: The protrusion is a spherical or cylindrical structure.

3. The electronic torque limiting wrench according to claim 1, characterized in that: The housing is provided with a reset spring for applying an elastic force to the input bar.

4. The electronic torque limiting wrench according to any one of claims 1 to 3, characterized in that: The unloading and reducing gear set includes multiple gear sets, each gear set consisting of two coaxially arranged gears. The gears of adjacent gear sets mesh to form a single-stage gear transmission mechanism.

5. An electronic torque limiting wrench, comprising a housing, a force-relieving and force-reducing gear set, and an input bar rotatably mounted on the housing, characterized in that: The input end component of the unloading and reducing gear set is provided with a protrusion, and the input bar is provided with a slot for inserting the protrusion. The input end component of the unloading and reducing gear set is rotatably mounted on the housing.

6. The electronic torque limiting wrench according to claim 5, characterized in that: The protrusion is a spherical or cylindrical structure.

7. The electronic torque limiting wrench according to claim 5, characterized in that: The housing is provided with a reset spring for applying an elastic force to the input bar.

8. The electronic torque limiting wrench according to any one of claims 5 to 6, characterized in that: The unloading and reducing gear set includes multiple gear sets, each gear set consisting of two coaxially arranged gears, with the gears of adjacent gear sets meshing.

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