Box type balance shaft module

Abstract

A box type balance shaft module comprises a shell with a containing cavity, and a balance shaft arranged inside the containing cavity; the containing cavity is provided with cavity walls located at the two ends of the balance shaft in the length direction; a shaft hole allowing the balance shaft to penetrate through is formed in the cavity walls; and a rolling body is arranged between the balanceshaft and the hole wall of the shaft hole, so that the balance shaft is supported in the shaft hole in a rolling friction mode. According to the scheme, sliding friction between the balance shaft andthe shaft hole is changed into rolling friction, so that friction between the balance shaft and the shaft hole is reduced, the requirements for the material and contact surface roughness degree are reduced, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of engines, in particular to a box-type balance shaft module. Background technique [0002] When the engine is working, the piston reciprocates to realize the working cycle, and the repeated high-speed linear motion of the piston in the cylinder will generate a large inertial force, which will cause the engine to vibrate. Therefore, some existing automobiles are provided with a balance shaft in the engine, and the balance shaft is driven by the rotation of the crankshaft. The rotating speed is the same as the crankshaft but the direction of rotation is opposite to the crankshaft, thereby absorbing the vibration of the engine. [0003] There are generally two ways to install the balance shaft, one is to install the balance shaft directly on the cylinder body, and the cylinder body has a special assembly hole for installing the balance shaft; the other is to first integrate the balance shaft in a box In the type housin...

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned box-type balance shaft module, there is sliding friction between the balance shaft and the bearing bush or the bushing, and the friction force is relatively large

In addition, on the one hand, the box-type balance shaft module has high requirements on the materials of the parts in frictional contact and the surface roughness of the contact surface. The contact surface usually needs fine grinding or mirror grinding to meet its roughness requirements, and the processing cost high

On the other hand, the box-type balance shaft module needs to use engine oil to lubricate the contact surface to prevent dry friction between the balance shaft and the bearing bush. Sealing the lubricating oil channel increases the weight and number of parts of the cassette balance shaft module, and increases the processing and assembly process of the cassette balance shaft module, which is costly

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