Micro-torque wrench

Abstract

The utility model belongs to the field of manual tools, and relates to a micro-torque wrench. The micro-torque wrench is mainly composed of a head unit (1), a cylinder unit (2) and a fixing unit (3). And the rod-shaped structure part of the head unit (1) is inserted into the central hole of the cylinder unit (2) and is fixed by the fixing unit (3). According to the micro-torque wrench, small locking torque can be provided, and part of positions needing small-torque fastening are effectively met. The torque of the wrench can be adjusted by controlling the hardness of the reed, and different nuts can be adapted by changing the shape of the front end of the head unit.

Description

Technical Field

[0001] The utility model belongs to the field of hand tools and relates to a micro torque wrench, in particular to a wrench which can control the locking torque of a nut within a very small range. Background Art

[0002] During the production and assembly process, the tightening of some special nuts requires a very small tightening torque. Excessive tightening torque may cause damage to the internal structure, and the locking torque controlled by manual feel will fluctuate too much. Therefore, a wrench that can control micro-torque is needed to meet the tightening requirements of the above-mentioned special nuts. Summary of the invention

[0003] The purpose of the utility model is to meet the assembly requirements of small torque nuts.

[0004] The technical solution of the utility model is a micro torque wrench, which is mainly composed of three units: a head unit 1, a barrel unit 2, and a fixing unit 3; the rod-shaped structure of the head unit 1 is inserted into the center hole of the barrel unit 2 and fixed by the fixing unit 3.

[0005] One end of the head unit 1 is a rod-shaped structure, and the other end is a mounting head 5. Two springs 4 are provided at the connecting end of the mounting head 5 and the rod-shaped structure, and the two springs 4 are in a straight line.

[0006] The mounting head is a semi-enclosed cylindrical structure, and the top of the cylindrical head is provided with two symmetrical cylindrical protrusions.

[0007] The cylinder unit 2 comprises a sensitive bearing 6 and a cylinder 7; a sensitive bearing 6 is mounted at each end of the cylinder 7, and the ring teeth on the upper edge of the cylinder 7 cooperate with the spring 4 of the head unit 1 to control the torque.

[0008] The hardness of the spring 4 can be controlled according to the torque required by the nut to be locked.

[0009] Sensitive bearing 6 friction torque ≤7.8×10 －5 .

[0010] The threaded bushing a8 in the fixing unit 3 is used to fix the head end of the mounting head 5, the threaded bushing b9 is used to fix the tail end of the mounting head 5, and the threaded ring 10 is used to fix the tail end sensitive bearing.

[0011] Advantages and positive effects of the utility model: The micro torque wrench of the utility model can provide a smaller locking torque, effectively meeting the needs of some positions that require small torque tightening. The wrench torque can also be adjusted by controlling the hardness of the spring, and the shape of the front end of the head unit can be changed to adapt to different nuts. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 Schematic diagram of the head unit structure;

[0014] Figure 3 Schematic diagram of the cylinder unit structure;

[0015] Figure 4 Schematic diagram of the fixed unit structure;

[0016] Among them: 1-head unit, 2-cylinder unit, 3-fixed unit, 4-reed, 5-mounting head, 6-sensitive bearing, 7-cylinder, 8-threaded bushing a, 9-threaded bushing b, 10-threaded ring. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings:

[0018] like Figure 1 As shown, a micro torque wrench is mainly composed of three units: a head unit 1, a barrel unit 2, and a fixing unit 3; the rod-shaped structure of the head unit 1 is inserted into the center hole of the barrel unit 2 and fixed by the fixing unit 3.

[0019] like Figure 2 As shown, one end of the head unit 1 is a rod-shaped structure, and the other end is a mounting head 5. Two springs 4 are provided at the connecting end of the mounting head 5 and the rod-shaped structure, and the two springs 4 are in a straight line.

[0020] The mounting head is a semi-enclosed cylindrical structure, and the top of the cylindrical head is provided with two symmetrical cylindrical protrusions.

[0021] like Figure 3 As shown, the cylinder unit 2 includes a sensitive bearing 6 and a cylinder 7; a sensitive bearing 6 is installed at each end of the cylinder 7, and the ring teeth on the upper edge of the cylinder 7 cooperate with the spring 4 of the head unit 1 to control the torque. The friction torque of the sensitive bearing 6 is ≤7.8×10 －5 .

[0022] The hardness of the spring 4 can be controlled according to the torque required by the nut to be locked.

[0023] like Figure 4 As shown, the threaded bushing a8 in the fixing unit 3 is used to fix the head end of the mounting head 5, the threaded bushing b9 is used to fix the tail end of the mounting head 5, and the threaded ring 10 is used to fix the tail end sensitive bearing.

[0024] During use, the operator rotates the wrench, and the serrated circle on the barrel unit 2 rotates to contact the spring of the installation head to generate a resistance torque. When the rotation torque is greater than the resistance torque, the head unit 1 will idle to ensure that the rotation torque of the wrench will be constantly less than the resistance (spring force). The wrench torque can be adjusted by controlling the hardness of the spring 4, and different nuts can be adapted by changing the shape of the front end of the head unit.

Claims

1. A micro torque wrench, characterized in that: The wrench mainly consists of three units: a head unit (1), a barrel unit (2), and a fixing unit (3); the rod-shaped structure of the head unit (1) is inserted into the center hole of the barrel unit (2) and fixed by the fixing unit (3); One end of the head unit (1) is a rod-shaped structure, and the other end is a mounting head (5). Two reeds (4) are provided at the connection end between the mounting head (5) and the rod-shaped structure, and the two reeds (4) are in a straight line. The mounting head (5) is a semi-enclosed cylindrical structure, and the top of the cylindrical structure has two symmetrical cylindrical protrusions; The hardness of the spring (4) is controlled according to the torque required by the nut to be locked.

2. The micro torque wrench according to claim 1, characterized in that: The cylinder unit (2) comprises a sensitive bearing (6) and a cylinder (7); a sensitive bearing (6) is mounted on each end of the cylinder (7); the ring teeth on the upper edge of the cylinder (7) cooperate with the spring (4) of the head unit (1) to control the torque.

3. The micro torque wrench according to claim 2, characterized in that: Sensitive bearing (6) friction torque ≤7.8×10 －5 .

4. The micro torque wrench according to claim 2, characterized in that: The fixing unit (3) comprises a threaded bushing a (8), a threaded bushing b (9), and a threaded ring (10); the threaded bushing a (8) is used to fix the head end of the mounting head (5), the threaded bushing b (9) is used to fix the tail end of the mounting head (5), and the threaded ring (10) is used to fix the tail end sensitive bearing (6).

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