Electric spanner for vehicle

Abstract

The invention provides an on-board electric wrench, comprising a flywheel, an output shaft, a lug boss and an impact block. A pin shaft which is used for positioning the impact block is sheathed with a torsion spring; two forcing ends of the torsion spring are respectively positioned on a position limit retaining pin and the impact block; the distance between the center of the positioning hole ofa steel ball and the center of the pin shaft complies with the requirement that the chord length corresponding to the motion track of the steel ball is more than the radius of the positioning hole ofthe steel ball. The invention replaces a pulling spring with the torsion spring, changes the adjusting position, leads the adjustment of the impact force and the recovery force of the impact block tobe realized by the rigidity of the torsion spring and the steel ball supporting spring respectively, solves the contradiction that adjustment of the impact force and the recovery force of the impact block is integrated into a whole on the pulling spring, meets the impact force of the wrench design, leads the recovery of the impact block to be slow, leads the engagement surface of the impact blockcan always push through the forcing surface of the convex block and convex shoulder before the screw is screwed or after the screw is loosened so as to achieve the continuous operation, and has the advantages of fully automation of loosening and tightening the screw, complete engagement of the impact block and the root of the convex block, and long service life.

Description

【Technical field】 [0001] The invention belongs to an electric wrench for a vehicle, in particular to an electric wrench for a vehicle using a vehicle storage battery as a power source. 【Background technique】 [0002] The electric wrench, which uses the car battery as the power source, is a car-carrying tool, which is favored by consumers for turning manual elastic and firm parts into electric operations. The application area is also becoming more and more extensive with the development and popularization of the automobile industry. [0003] Chinese Patent No. 032291744 "a two-way impact electric and pneumatic wrench" is a typical electric wrench at present. see figure 1 (This figure is a cross-sectional schematic diagram of flywheel 40a) When working, it utilizes a DC12V DC motor to utilize a car battery (cigarette lighter seat) as a working power supply, and drives the flywheel to rotate through the motor shaft and its gear pair meshing clutch. There are two eccentric imp...

AI Technical Summary

Problems solved by technology

Due to the unreasonable setting position of the steel ball 200a which acts as a limiter, the movement trajectory of the steel ball does not match the movement trend of the eccentric impact block 40a, not only the eccentric impact block cannot achieve the purpose of accelerated impact, but also eccentric impact will occur The lack of position between the block engagement surface 701a and the bump shoulder 103a, that is, the innermost end of the eccentric impact block engagement surface 701a cannot reach the shoulder root 104a of the bump, causing only a local force on the outer layer of the shoulder 103a , so that it is easy to break and damage the eccentric impact block and bump, shortening the service life of the electric wrench

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