Method for assembling crankshaft connecting rod bushing
A crankshaft connecting rod and assembly method technology, which is applied in metal processing, metal processing equipment, manufacturing tools, etc., can solve the problem of large interference on the outer wall of the bushing and the inner wall of the small head hole of the connecting rod, which is not suitable for ensuring the fit and scratches and other issues, to achieve the effect of good fit, easy assembly, and avoid scratches
Inactive Publication Date: 2012-06-20
TIANRUN IND TECH CO LTD
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Problems solved by technology
The degree of fit between the connecting rod bushing and the inner wall of the small head hole of the connecting rod is a key indicator, and the press-fitting process of the bushing mainly adopts cold pressing at first, and the bushing is directly pressed into the small head hole. The problem is that there is a large amount of interference between the outer wall of the bush and the inner wall of the small head hole of the connecting rod, which leads to problems such as scratches, and it is not suitable to ensure the fit
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[0007] The present invention will be further described below.
[0008] The invention relates to an assembly method of a crankshaft connecting rod bushing, which first uses a heating device whose front end is an induction coil to heat the small head hole of the crankshaft connecting rod, and when heating, the induction coil is put into the small head hole of the connecting rod, The current generates an alternating magnetic field, which causes eddy currents to be generated inside the metal connecting rod, causing the metal workpiece to heat rapidly, thereby causing the small head hole of the connecting rod to heat up and expand, and the hole diameter becomes larger. The interference is pressed into the small end hole of the connecting rod. At this time, the force between the bush and the small end hole of the connecting rod is small, so problems such as scratches can be avoided after pressing. After natural cooling, the diameter of the small head hole of the connecting rod becom...
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The invention relates to a method for assembling a crankshaft connecting rod bushing. According to the method, a small-end hole of a crankshaft connecting rod is heated by using heating equipment of which the front end is provided with an induction coil, the induction coil is put into the small-end hole of the connecting rod during heating and generates an alternating magnetic field, and eddy is generated inside the connecting rod by the alternating magnetic field, so that the small-end hole of the connecting rod is heated and expanded to enlarge a pore diameter; the connecting rod bushing is pressed in the small-end hole of the connecting rod in an interference mode; and after the small-end hole is cooled naturally, the pore diameter of the small-end hole of the connecting rod is reduced, so that the small-end hole is in tight fit with the outer wall of the connecting rod bushing to complete assembly. According to the method, a hot assembly process is adopted, the method is simple, labor-saving and time-saving, and the crankshaft connecting rod bushing is easy to assemble; the connecting rod bushing is pressed in an interference mode, and stress between the connecting rod bushing and the small-end hole of the connecting rod is small, so the problems of scratching and the like can be solved; and the bushing is in tight fit with the small-end hole of the connecting rod, so the fitting degree is high.
Description
technical field [0001] The invention relates to an assembly method of a crankshaft connecting rod, in particular to an assembly method of a crankshaft connecting rod bushing. Background technique [0002] The crankshaft connecting rod is an assembly assembly, which is composed of connecting rod body, connecting rod bolts and connecting rod bushing, and the connecting rod bushing is pressed into the small head hole of the connecting rod. During the operation of the engine, the piston pin and The bushing is in direct contact, where the bushing plays a key role. The degree of fit between the connecting rod bushing and the inner wall of the small head hole of the connecting rod is a key indicator, and the press-fitting process of the bushing mainly adopts cold pressing at first, and the bushing is directly pressed into the small head hole. The problem is that there is a large amount of interference between the outer wall of the bush and the inner wall of the small head hole of ...
Claims
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IPC IPC(8): B23P11/02
Inventor 孙海涛丛建臣葛全会朱海峰孙军
Owner TIANRUN IND TECH CO LTD