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Correction of camshaft cracking of B-type fuel injection pump of 6135 diesel engine
Source: China Bearing Network Time: 2013-01-13
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The 6135 diesel engine adopts the B-type whole plunger type fuel injection pump. It is fixed on the bracket of the diesel engine body by 4 bolts; the diesel engine crankshaft is driven by the timing gear; the fuel injection pump camshaft and the fuel injection pump drive shaft use the coupling. Connection. The lift of the fuel injection pump cam is 10mm; the distance between the sub-pumps is 40mm; the maximum speed of the fuel injection pump is 1000r/min. Because of the high-speed working condition of the fuel injection pump and the "four-point support" device mode and the application protection It is easy to form the contact between the fuel injection pump and the bracket. The arc surface of the pump is worn out (the inner arc surface of the bracket is relatively worn); the pump body moves down; the camshaft axis is offset from the axis of the fuel pump drive shaft. The fuel injection pump cam The shaft is subjected to additional forces such as alteration, tortuosity and sway, and additional alternating stress occurs; the end causes the camshaft to fatigue and crack.
The method of troubleshooting; usually the replacement correction. The surface roughness of the camshaft of the B-type fuel injection pump of the 6135 diesel engine is not greater than Ra0. 32; the hardness is not lower than HRC45; the cylindricity is 0. 10mm; The public service is 0. 05mm. If the cause of the camshaft cracking is not found; it must cause re-cracking. There are 3 emergency measures for on-site correction.
(1) The original correction method forms the bottom edge of the camshaft cracking, which is the wear of the pump body of the fuel injection pump. Therefore, it is possible to weld the pump body by electric welding and brazing, and the thickness and area of ​​the stacking compensation are slightly better than that of the pump body. The amount of wear is large. After welding, the welding parts are polished and flattened by means of frustration and grinding; the original shape of the rehabilitation pump body is removed; the parts are removed; the machine can be used after commissioning. The original correction method can also be supplemented with metal glue. Method; repair the pump body of the fuel injection pump; that is, apply the prepared metal glue to the wear area; the thickness and area of ​​the metal glue coating are slightly larger than the wear amount; after the metal glue is condensed for 20~30 minutes; The area is polished and polished; the parts are removed; the machine can be used after commissioning.
(2) Parts disassembly method The raw material of the B135 type fuel injection pump body of the 6135 diesel engine is usually cast iron or aluminum alloy; although the raw materials are different; the scale and internal structure of the device are completely the same. Therefore, the 6135 diesel engine B can be used in the waste. In the type of fuel injection pump; according to the need to disassemble the pump body, camshaft and other parts that can be used; assemble into an intact B-type fuel injection pump; after commissioning, install the machine.
(3) The additional part method is in the field; when the "original correction method" and the "part disassembly method" cannot be used; the "additional part method" can be selected. The specific method is as follows: (1) Grinding the wear parts of the pump body with a trowel and an abrasive cloth Lighting (wearing part is the cooperation surface with the bracket; and the end of the driving pump drive shaft is more severe), 2 using the depth caliper to measure the depth of the worn part of the pump body; the wear depth is usually between 05~1mm, 3 An additional gasket is made of copper or iron; the thickness is determined according to the depth of the measured wear portion; the width is approximately equal to the thickness of the bracket; the length is approximately equal to the arc length of the wear portion of the pump body, and the gasket is prepared. It is added between the bracket and the wear part of the pump body; the quantity should be determined according to the depth value of the measured wear part; usually it should not exceed 3 pieces; 5 device adjustment and start the test run.
The wear of the pump body of the B135 type fuel injection pump of the 6135 diesel engine is mainly due to the relative looseness of the pump body and the bracket. Therefore, it can be prevented from the following three aspects.
(1) The following points should be noted when the device is to be properly installed: 1 The fixing bolt should be tightly fixed. If it is first tightened on the outside or on the side of the body, it can change the adjusted oil supply early angle; On the other hand, the camshaft axis of the fuel injection pump can be offset from the axis of the oil pump drive shaft; the camshaft is directly subjected to additional alternating stress and fatigue cracking. 2 The fixing bolt should be tightened 2 to 3 times. 3 The tightening torque of the fixing bolt Should be between 1. 5~2. 5N?m. 4 fixing bolts should be tightly in place. If the two fixing bolts on the side close to the body are not fixed due to the orientation of the device; the two outer fixed screws Simple tightening too much.
(2) Protection should be appropriate in the application of the protection process should pay attention to the following three points: 1 the quantity and quality of the oil in the fuel injection pump should meet the requirements. If the smoothness is bad; the light will make the transmission parts in the pump wear prematurely; The card is dead; the cam is formed to be twisted. 2 The axial clearance of the camshaft is appropriate; usually 0. 03~0. 15mm. The gap is too large; the camshaft wears up; the diesel engine works unevenly; the premature wear of the pump body is formed. 3 The fuel supply early angle of the fuel injection pump and the oil supply distance angle of each cylinder should meet the requirements; otherwise, the diesel engine's power and economy will not be deteriorated; and the diesel engine will be difficult to start and the work will be unstable;
(3) Check the looseness of the pump body and bracket of the B-type fuel injection pump of the 6135 diesel engine in time; usually check it during the weekly protection. If the diesel engine is found to have abnormal condition or the pump body is loose, it should be checked in time.
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