Connection rod small head system with grooves

A technology with small connecting rods and grooves, which is applied in the direction of connecting rods, shafts, bearings, mechanical equipment, etc., can solve the problems of cumbersomeness, increased process costs, and high specific pressure of connecting rod small head bushings, so as to ensure normal application , reduce side load stress, reduce the effect of specific pressure

Pending Publication Date: 2019-01-22
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Increasing the diameter or width of the small head hole of the connecting rod will correspondingly increase the size of the piston pin, thereby increasing the weight of the piston, piston pin, connecting rod, piston compression height and connecting rod length, which is not conducive to the lightweight of the engine design and compactness;
[0005] 2. Select high-grade connecting rod bushing materials, this method will greatly increase the unit price of connecting rod bushings, which is not conducive to the cost reduction design of the engine;
[0006] 3. Design special-shaped or trumpet-shaped bushing pin holes, so that the connecting rod assembly manufacturer needs to add a cumbersome process of processing special-shaped lines, which will increase the process cost and is also not conducive to cost-reducing design
Although this design can improve the rigidity and strength of the connecting rod assembly, it still has the defect that the specific pressure of the bushing at the small end of the connecting rod is relatively high

Method used

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  • Connection rod small head system with grooves
  • Connection rod small head system with grooves
  • Connection rod small head system with grooves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see Figure 1 to Figure 5 , a grooved connecting rod small head system, comprising a small head end 4 and a central hole 5 opened in the middle, the bottom end of the small head end 4 is connected with the large head end through the shaft 2; the small head end 4 is connected with the large head end; An inner groove 6 is respectively opened on the front side and the back side of the part near the bottom end of the center hole 5 on the upper part 4 , and the inner groove 6 is unidirectionally opened to the outside.

Embodiment 2

[0049] The basic content is the same as that of Example 1, except that:

[0050] The inner groove 6 includes a left arc portion 61, a middle arc portion 62 and a right arc portion 63. The right end of the left arc portion 61 is connected to the left end of the right arc portion 63 through the middle arc portion 62. The central axis of 62 coincides with the central axis of the central hole 5, and the left arc portion 61 and the right arc portion 63 are symmetrically arranged with the central axis of the central arc portion 62 as the symmetry line; the left end of the left arc portion 61 is higher than The right end of the right arc portion 63 is set higher than the left end, and the left end of the left arc portion 61 and the right end of the right arc portion 63 are arc structures. Preferably, the cross-section 7 of the inner groove 6 is an isosceles trapezoid structure, which includes an outer edge 71, an inner bottom edge 72, and an upper waist edge 73 and a lower waist edge...

Embodiment 3

[0052] The basic content is the same as that of Example 1, except that:

[0053] The area between the center hole 5 and the shaft 2 on the small end 4 is the rod bearing area 3, and an inner groove 6 is respectively opened on the front and back of the rod bearing area 3; the inner groove 6 The ratio of the groove depth 64 to the width of the rod bearing area 3 is 0.1-0.3, the ratio of the groove width 65 of the inner groove 6 to the radius of the central hole 5 is 0.05-0.1, the left and right ends of the inner groove 6 and the central hole 5 The center lines respectively intersect to form length angles 66, the length angles 66 being 45°-60° in size. The edge distance 67 between the upper edge of the inner groove 6 and the bottom edge of the central hole 5 is 1-3 mm.

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Abstract

The invention relates to a connection rod small head system with grooves. The connection rod small head system comprises a small head end and a center hole arranged on the middle portion, wherein thefront surface and the back surface, close to the bottom end of the center hole, on the small head end are respectively provided with an inner concave groove, the inner concave groove has a one-way outward opening, and comprises a left arc part, a middle arc part and a right arc part, the left arc part, the middle arc part and the right arc part are sequentially connected, the center axis of the middle arc part coincides with the center axis of the center hole, the left arc part and the right arc part are symmetrically arranged left and right by using the center axis of the middle arc part as the symmetric line, the left end head of the left arc part is higher than the right end head of the left arc part, and the right end head of the right arc part is higher than the left end head of the right arc part. According to the present invention, with the design scheme, the edge load stress of the bushing can be reduced to achieve the low specific pressure of the connection rod small head bushing, and the rigidity is qualified so as to meet the lightweight design requirements.

Description

technical field [0001] The invention relates to a connecting rod structure, belonging to the design field of a connecting rod assembly of an automobile engine, in particular to a connecting rod small end system with a groove, which is particularly suitable for reducing the side load stress of a bushing, so that the connecting rod small end bushing less pressure. Background technique [0002] The connecting rod is the core moving part of the engine, mainly including the big end of the connecting rod, the connecting rod body and the small end of the connecting rod. Rotational movement. Therefore, the small end of the connecting rod is not only subjected to the huge gas pressure from the top of the piston, but also oscillates relative to the piston. Limited by the size of the inner cavity of the piston, the pressure per unit area of ​​the small end of the connecting rod (that is, the specific pressure) is relatively high, and the stiffness of the piston pin is lower than that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C7/02
CPCF16C7/023
Inventor 雷俊廖荣盛周志亮陈玲
Owner DONGFENG COMML VEHICLE CO LTD
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