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Overview of high-power hydraulic torque wrenches.hydraulic torque wrench Wholesale
source:Industry News release time:2021-12-18 Article author:Rosit Popular:Air band saw
1. Structure
The main body of the camshaft is a cylindrical rod with the same length as the cylinder group. There are several cams on it, which are used to drive the valve. One end of the camshaft is the bearing support point, and the other end is connected with the driving wheel. The side of the cam is egg-shaped. The purpose of its design is to ensure adequate intake and exhaust of the cylinder, specifically to complete the opening and closing of the valve in the shortest possible time. In addition, considering the durability of the engine and the smoothness of operation, the valve should not have too much impact due to the acceleration and deceleration process in the opening and closing action, otherwise it will cause severe valve wear, increased noise or other serious consequences. Generally speaking, in in-line engines, one cam corresponds to one valve, while V-type engines or horizontally opposed engines share one cam for every two valves. Because of their special structure, rotary engines and valveless engines do not need cams.
2. Failure
Common failures of camshafts include abnormal wear, abnormal noise, and breakage. Symptoms of abnormal wear often appear before abnormal noise and breakage occur.
(1) The camshaft is almost at the end of the engine's lubrication system, so the lubrication status is not optimistic. If the oil pump has insufficient oil supply pressure due to reasons such as excessive use time, or the lubricating oil passage is blocked and the lubricating oil cannot reach the camshaft, or the tightening torque of the bearing cap fastening bolts is too large, the lubricating oil cannot enter the camshaft gap. Cause abnormal wear of the camshaft.
(2) Abnormal wear of the camshaft will cause the gap between the camshaft and the bearing seat to increase, and the camshaft will undergo axial displacement when it moves, resulting in abnormal noise. Abnormal wear will also cause the gap between the driving cam and the hydraulic tappet to increase. When the cam is combined with the hydraulic tappet, an impact will occur, which will cause abnormal noise.
(3) The camshaft sometimes has serious failures such as fractures. The common causes are hydraulic tappet cracking or severe wear, severe lubrication, poor camshaft quality, and camshaft timing gear rupture.
(4) In some cases, the failure of the camshaft is caused by man-made reasons, especially when the camshaft is not properly disassembled and assembled when the engine is repaired. For example, when removing the camshaft bearing cover, use a hammer or a screwdriver to pry pressure, or when installing the bearing cover, the position of the bearing cover is mismatched with the bearing seat, or the tightening torque of the bearing cover fastening bolt is too large.
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