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Fixture for car engine balance shaft

A technology for engines and balance shafts, which is applied in clamping, manufacturing tools, metal processing machinery parts, etc., can solve the problems of high scrap rate, affecting the shape and position tolerance of parts, affecting unbalance, etc., so as to reduce scrap rate and increase use Longevity and the effect of saving fixture cost

Inactive Publication Date: 2013-01-02
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the processing of the balance shaft, the use of unsuitable fixtures will cause a deviation between the axis of the central hole and the geometric centerline of the part, which will not only affect the unbalance, but also affect a series of geometric tolerances of the part, such as: parallelism, position and cylindricity, etc., so that the reject rate of the product becomes higher

Method used

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  • Fixture for car engine balance shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, a fixture used for the balance shaft of a car engine includes a fixture platform 5 and two V-shaped positioning blocks 2. Two discs 4 with central holes are arranged in the fixture platform 5, and the central holes of each disc 4 A spring 3 is arranged below, and two V-shaped positioning blocks 2 are symmetrically arranged on the fixture table 5. Each V-shaped positioning block 2 is composed of a V-shaped positioning pillow 22 and a central axis 21 under the V-shaped positioning pillow. The V-shaped positioning pillow 22 is located on the upper surface of the fixture table 5, and is used to clamp the workpiece 1. The central axis 21 passes through the center hole of the disc 4 provided in the fixture table 5, and extends into the spring 3, and the V-shaped positioning is made by the elastic force of the spring 3. Block 2 can float up and down and stick to workpiece 1 automatically. The periphery of the central hole of the disk 4 is provided w...

Embodiment 2

[0020] The central shaft of the V-shaped positioning block is also equipped with two large and small shaft sleeves. The large shaft sleeve is set on the upper part to prevent the debris after cutting the workpiece from falling into the assembly hole of the central shaft of the V-shaped positioning block, and the small shaft sleeve is set on the lower part. , to fix the position of the V-shaped positioning block, and the rest are the same as in Embodiment 1.

Embodiment 3

[0022] There is also a hydraulic cylinder for auxiliary positioning on the fixture table. After the V-shaped positioning block clamps the workpiece, it is clamped by the hydraulic cylinder, which can ensure that it does not shift relative to the positioning reference when the workpiece is processed, and the clamping force of the hydraulic cylinder can also The length of the spring is kept constant, and the positioning will not be unreliable due to the action of the spring during processing, and the rest are the same as in Embodiment 1.

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Abstract

The invention relates to a fixture for a car engine balance shaft. The fixture comprises a fixture table and two V-shaped positioning blocks. Two disks with a central hole are arranged in the fixture table. A spring is arranged below the central hole of each disk. The two V-shaped positioning blocks are symmetrically disposed on the fixture table. Each V-shaped positioning block comprises a V-shaped positioning rest and a central shaft below the V-shaped positioning rest. The V-shaped positioning rest is located on the upper surface of the fixture table to clamp a workpiece, and the central shaft penetrates through the central hole of each disk in the fixture table and extends into the springs. The V-shaped positioning blocks can float up and down to automatically attach with the workpiece under elasticity of the springs. Compared with the prior art, the fixture has the advantages of accuracy in positioning, low rejection rate, long service life and the like.

Description

technical field [0001] The invention relates to a clamp, in particular to a clamp for the balance shaft of a car engine. Background technique [0002] For the control method of unbalanced quantity, it is basically divided into two kinds: deweighting and aggravating. In the early days, the de-weighting method was used more, but later the rotor-like shaft parts were more heavily used. The advantage of adding weight is firstly that the process is convenient. After the balance is qualified, the weight is fastened and it is finished, and it is also convenient to correct after operation. The deduplication process is relatively cumbersome, and it is necessary to gradually deduplicate the parts until they are qualified. Since the weight to be removed is difficult to verify, it can only be approximated step by step, which consumes a lot of man-hours, and the process is irreversible, which easily increases the scrap rate. [0003] Some products have high requirements for surface sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q3/06
Inventor 宋新萍
Owner SHANGHAI UNIV OF ENG SCI