Connecting rod small end bush, processing method and equipment
A technology of connecting rod small end and processing method, which is applied in the field of engine parts, can solve the problems of strain damage, large load and easy deformation of bushings and piston pins 3, so as to reduce edge load pressure and improve fitting. , to avoid the effect of friction and abrasion
Active Publication Date: 2021-03-02
CRRC DALIAN CO LTD
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Problems solved by technology
However, if Figure 4 When the diesel engine shown is working, the explosion pressure generated by the combustion of the oil-air mixture in the cylinder acts on the piston 1, and the load transmitted by it is large, and the piston pin 3 is easily deformed under the action of the force between the piston 1 and the connecting rod 5 , the amount of deformation is proportional to the explosion pressure. The piston pin 3 is designed to allow a certain amount of deformation when the diesel engine is working. The lubricating oil film cannot be formed between the rod bushing 2 and the piston pin 3, and the dry friction between the two will occur at the edge dry friction position 6 where the load exceeds the limit, which will eventually cause the bushing and piston pin 3 to be strained and damaged, which will lead to a major accident
Method used
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Embodiment 1
[0083] Taking a certain type of diesel engine as an example, after analyzing the finite element data of its connecting rod bushing, it can be obtained as follows: Figure 7 For the wear profile shown, the profile line takes the axial midpoint of the bush as 0 point, and moves from the axial edge of the bush to the midpoint of the bush. With the increase of the axial dimension, the wear amount gradually decreases until At the midpoint of the axial direction, the wear amount increases gradually, and the wear amount changes centrally.
[0084] The connecting rod bushing is made of alloy steel. According to the mechanical design manual, the elastic modulus E is 186-206GPa, the Poisson's ratio μ is 0.25-0.30, the outer diameter D of the bushing is 112mm, and the inner diameter d is 100mm.
[0085] Substituting the above parameters into the formula,
[0086]
[0087] according to Figure 7 The expected type line shown, can be obtained as Figure 8 Clamping force curve shown. ...
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Abstract
The invention discloses a bushing at the small end of a connecting rod and a diesel engine comprising the bushing. The axial profile line of the inner surface of the bushing is consistent with the axial profile line of the surface of the piston pin when it deforms concavely under the maximum explosion pressure. fit. The processing method is to set the contact surface between the processing fixture and the inner surface of the bushing so that the axial profile line of the contact surface matches the surface axial profile line of the piston pin when it is concavely deformed under the maximum explosive pressure. The processing equipment includes the processing cutter head and the cutter head control device. The cutter head control device controls the travel curve of the cutter head, so that the axial profile of the curved surface formed by the travel curve of the cutter head and the piston pin are deformed under the maximum burst pressure. When the surface axial section line is fitted. The invention reduces the edge load pressure caused by the bending deformation of the piston pin, improves the fit between the piston pin and the bearing surface of the bushing, avoids the friction and abrasion of the piston pin and the bushing, and ensures the piston, piston pin and connecting rod of the diesel engine. normal working condition.
Description
technical field [0001] The present invention relates to the technical field of engine parts, and more specifically, to a bushing at the small end of a connecting rod, a processing method and equipment. Background technique [0002] The diesel engine power group is composed of cylinder head, cylinder liner, piston connecting rod group and other components. The connecting rod of the piston connecting rod group is divided into a large end and a small end. Install it on the piston and the big end on the crankshaft of the diesel engine. When the diesel engine is working, the explosive pressure generated by the combustion of the gas mixture in the cylinder pushes the piston to make a linear motion, and the crankshaft is driven by the connecting rod to convert the linear motion into a rotary motion. [0003] Such as figure 1 , figure 2 , image 3 In the prior art shown, the piston connecting rod group is composed of piston 1, connecting rod 5, connecting rod bushing 2, piston ...
Claims
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IPC IPC(8): F16C9/04F16C33/04B23D79/00B23Q3/06B23Q15/14
CPCB23D79/00B23Q3/062B23Q15/14F16C9/04F16C33/04
Inventor 安军张健姜昭禹高云巍姜旭龙张健桀
Owner CRRC DALIAN CO LTD