CN203308915U

CN203308915U - Supercharged engine bearing bush

Info

Publication number: CN203308915U
Application number: CN2013202535774U
Authority: CN
Inventors: 罗珒; 黄鹏华; 彭友成
Original assignee: SAIC GM Wuling Automobile Co Ltd
Current assignee: SAIC GM Wuling Automobile Co Ltd
Priority date: 2013-05-10
Filing date: 2013-05-10
Publication date: 2013-11-27
Anticipated expiration: 2023-05-10

Abstract

The utility model provides a supercharged engine bearing bush. The supercharged engine bearing bush comprises a main bearing bush and a connection rod bearing bush, and is characterized in that micro-ripples are arranged on the surfaces of the main bearing bush and the connection rod bearing bush. Furthermore, the depths of the micro-ripples are improved in wall-thickness gradual-reduction regions of the main bearing bush and the connection rod bearing bush. The widths of the micro-ripples are 0.2-0.3mm, and the depths of the micro-ripples are 0.001-0.004mm. The depths of the micro-ripples are improved to be 0.0015-0.008mm in the wall-thickness gradual-reduction regions of the main bearing bush and the connection rod bearing bush. Furthermore, an oil groove in the main bearing bush is at an angle of 170 degrees. By arranging the micro-ripples on the surface of the bearing bush, preliminary running-in of an engine is facilitated in the working environment of low-temperature cold start, sudden stop/sudden start and insufficient lubrication of engine oil particularly. By virtue of the 170-degree oil groove in the main bearing bush, the oil leakage of the engine oil is effectively improved, and the capacities of storing oil and supplying the oil to the connection rod bearing bush of the bearing bush are improved.

Description

A kind of supercharged engine bearing shell

Technical field

The utility model relates to a kind of supercharged engine bearing shell.

Background technique

Engine bearing mainly refers to crankshaft bearing liner, comprises main axle bush and connecting rod bearing shell.At present crankshaft bearing liner adopts Sliding bush more, and its working environment is comparatively severe: the alternate load effect of bearing gas pressure and piston rod group reciprocal inertia force on the one hand is in the fatigue stress state, its Gao Bikeda 16～50MPa; On the other hand, more than relative sliding velocity between bearing shell and axle journal can reach 10m/s, consequent a large amount of frictional heat is under higher operating temperature bearing shell, add in lubricant oil and inevitably have solid particle, cause boundary friction and wearing and tearing, so crankshaft bearing liner is the quick-wear part in motor.According to the operating conditions of crankshaft bearing liner, require it must have endurance, heat resistance, wearability, seizure resistance, compliance, embedding Tibetan property, running-in ability, corrosion resistance.

The performance of bearing shell directly affects reliability and the durability of engine operation, also has influence on simultaneously the further potentiality of strengthening of motor, i.e. the development of engine booster direct injection technology.Along with the application of supercharging direct injection technology on motor, HP, hp/litre is significantly promoted, crankshaft bearing liner has been proposed to more harsh requirement, cause crankshaft bearing liner, particularly the bearing load of connecting rod bearing shell is higher than 50MPa, except promoting the bearing shell material property, it is particularly important that the design of bearing shell also becomes.

During current engine cold-start, machine oil can't be fed on crankshaft bearing liner in time, causes dry friction between bearing shell and bent axle, and there is the risk of locking bent axle in bearing shell; Along with the development of engine booster technology, pressure of explosion and the power of motor constantly promote, and bearing capacity and the break-in ability of crankshaft bearing liner had to requirements at the higher level.

The model utility content

Technology of the present utility model is dealt with problems and is: for the deficiencies in the prior art, provide a kind of supercharged engine bearing shell.

Technical solution of the present utility model is:

The supercharged engine bearing shell that the utility model provides, comprise main axle bush and connecting rod bearing shell, it is characterized in that: the surface at main axle bush and connecting rod bearing shell is provided with microwaviness.

Further, in main axle bush and connecting rod bearing shell wall thickness weakened region gradually, deepen the degree of depth of microwaviness.

The width of described microwaviness is 0.2～0.3mm, and the degree of depth is 0.001～0.004mm.

In main axle bush and connecting rod bearing shell wall thickness weakened region gradually, the degree of depth of microwaviness adds and is deep to 0.0015～0.008mm.

Further, the oil groove on described main axle bush is 170 degree.

The utility model compared with prior art has following advantage:

(1) on the bearing shell surface, microwaviness is set, is conducive to the break-in of motor initial stage, particularly low-temperature cool starting, the anxious working environment that stops the anxious oil lubricating deficiency opened.

(2) main axle bush 170 degree oil groove designs, when increasing the main axle bush loaded area, can reduce the leakage of oil groove inner engine oil, helps machine oil to arrive crank-shaft link neck by crankshaft oil hole, lubricated connecting rod bearing shell.Improve effectively that lubricating oil leakage promotes the bearing shell oil storage and to the connecting rod bearing shell supply capability.

The accompanying drawing explanation

Fig. 1 is the microwaviness schematic diagram;

Fig. 2 is the connecting rod bearing shell schematic diagram;

Fig. 3 is the main axle bush schematic diagram;

Fig. 4 is main axle bush section 170 degree oil groove schematic diagram.

Description of reference numerals

1, oil groove 2, oilhole

Embodiment

Below with reference to accompanying drawing, embodiment of the present utility model is described.

According to supercharged engine bearing shell of the present utility model, comprise main axle bush and connecting rod bearing shell, compared to existing technology, one of improvement is the microwaviness design of bearing shell surface, namely on the surface of main axle bush and connecting rod bearing shell, is provided with microwaviness.At the bearing shell machining surface, processing width is 0.2～0.3mm, and the degree of depth is the microwaviness of 0.001～0.004mm.Further, in main axle bush and connecting rod bearing shell wall thickness weakened region gradually, deepen the degree of depth of microwaviness, ripple's depth adds and is deep to 0.0015～0.008mm.As shown in Figure 1.Crest helps the initial stage break-in, when bent axle surface Machining precision deficiency, or while existing foreign matter to enter between bent axle and bearing shell, the crest of microwaviness can be worn, with bent axle surface break-in, the microwaviness trough can store machine oil simultaneously, helps to lubricate, and can not form bent axle and contact with bearing shell surface face.

Two of improvement is that the oil groove on main axle bush is made as 170 degree, as shown in Figure 2.The connecting rod bearing shell design is without oilhole and oil groove, as shown in Figure 3.Two oilholes 2 of main axle bush top bearing shell design and middle oil groove 1, lower watt of main axle bush is without oilhole and oil groove design, as shown in Figure 4.Be mainly in order to guarantee the bearing capacity of lower watt of connecting rod bearing shell and main axle bush, the oilhole by main axle bush on watt and oil groove fuel feeding are to connecting rod bearing shell simultaneously.Crank spindle watt design 170 degree oil grooves, when increasing the main axle bush loaded area, can reduce the leakage of oil groove inner engine oil, helps machine oil to arrive crank-shaft link neck by crankshaft oil hole, lubricated connecting rod bearing shell.And the oil groove design of common 180 degree of traditional main axle bush is due to the distortion after Sleeve assembling, inboard larger with the crankshaft journal gap at bearing shell port junction bearing shell, lubricating oil leakage is more.

Certain 1.2L supercharged engine crankshaft bearing liner employing corrugated tile and 170 degree oil grooves design, and can effectively promote the bearing capacity of bearing shell, under the condition of high loaded process, promote the ability of bearing shell surface oil storage and formation oil film.

The utility model is not limited to the protection content that claim and specific embodiment are addressed, so long as any invention of creating out according to design of the present invention, within all should belonging to protection domain of the present utility model.

Claims

1. a supercharged engine bearing shell, comprise main axle bush and connecting rod bearing shell, it is characterized in that: the surface at main axle bush and connecting rod bearing shell is provided with microwaviness; The width of described microwaviness is 0.2～0.3mm, and the degree of depth is 0.001～0.004mm; In main axle bush and connecting rod bearing shell wall thickness weakened region gradually, deepen the degree of depth of microwaviness.

2. supercharged engine bearing shell according to claim 1 is characterized in that: the oil groove on described main axle bush is 170 degree.