Common rail diesel engine cam shaft drive device

Abstract

The invention belongs to the technical field of machines, and provides a common rail diesel engine cam shaft drive device. The provided common rail diesel engine cam shaft drive device is provided with a hub in a stepped shaft shape. A step through hole is formed in the center of the hub. The end face of the right side of the hub is provided with a blind hole used for being in interference fit with a cam shaft. The hub is provided with a radial oil hole communicating with the step through hole. The center of the cam shaft is provided with a pressure lubricating oil way II communicating with the step through hole. The left end of the cam shaft is in interference fit with the hub, and the right end of the cam shaft stretches out of the hub and is supported in a machine body through a cam shaft lining. The hub is sleeved with a front end cover, and a bearing lining which is in clearance fit with the hub is arranged between the front end cover and the hub. A gap between the bearing liningand the hub communicates with the radial oil hole. The hub is sleeved with a drive gear which is in clearance fit with the hub. A thrust device is fixed to the left end of the hub. The common rail diesel engine cam shaft drive device effectively avoids abnormal abrasion of the cam shaft lining at the drive end, and the reliability of the cam shaft drive device is improved.

Description

technical field [0001] The invention belongs to the technical field of machinery, and in particular relates to a camshaft driving device of a common rail diesel engine. Background technique [0002] The camshaft is an important part of the diesel engine. It drives the rocker arm and the valve mechanism to control the opening and closing of the valve at regular intervals, so as to provide the diesel engine with the fresh air necessary for combustion in the cylinder and ensure the external output power of the diesel engine. [0003] The camshaft driving device is an important part of the gas distribution system of a diesel engine. It provides power for the camshaft and drives the camshaft to rotate. Whether its design method is reasonable or not directly determines the reliability of the camshaft; for many high-speed and high-power diesel engines , There are too many accessories and heavy weight at the driving end of the camshaft, which will generate a large bending moment on ...

AI Technical Summary

Problems solved by technology

[0003] The camshaft driving device is an important part of the gas distribution system of a diesel engine. It provides power for the camshaft and drives the camshaft to rotate. Whether its design method is reasonable or not directly determines the reliability of the camshaft; for many high-speed and high-power diesel engines , There are too many accessories and heavy weight at the driving end of the camshaft, which will generate a large bending moment on the camshaft bearing at the driving end, which will easily cause abnormal wear of the bearing; at the same time, due to the axial thrust of the active helical gear, the camshaft is working Axial movement will occur during the process, which is unfavorable to the normal operation of the camshaft, and a reasonable camshaft thrust device must be designed to eliminate the adverse effects; for many common rail diesel engines, the gear box needs to arrange the common rail pump gear And its idler mechanism, in such a narrow space, it brings great difficulties to the layout of the camshaft drive mechanism

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