CN104373240A

CN104373240A - Lubrication structure for skirt section of inner piston of engine cylinder block

Info

Publication number: CN104373240A
Application number: CN201410590920.3A
Authority: CN
Inventors: 廖寿昌; 张怡; 徐桂林; 杨景
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2014-10-29
Filing date: 2014-10-29
Publication date: 2015-02-25

Abstract

The invention discloses a lubrication structure for a skirt section of an inner piston of an engine cylinder block. The lubrication structure comprises a crank case body, wherein a crank shaft is arranged in the crank case body, the cylinder block is arranged on the side surface of the crank case body, and the piston is arranged in the cylinder block and connected with a crank part of the crank shaft through a connection rod to form a crank connection rod mechanism; lubrication oil holes are formed in the side wall in the air inlet direction of the cylinder block, when an engine works, the crank shaft rotates anticlockwise, and lubrication oil in the crank case body splashes to the skirt section of the piston through the lubrication oil holes in the cylinder block in the crank tangential direction, so that the main thrust surface of the skirt section of the piston is full of the lubrication oil, forming of a lubrication oil film is facilitated, and frictional force and frictional loss borne by the piston are reduced; at the same time, under the conditions of same piston quality and skirt section area, the power of the engine can be improved remarkably; besides, the force load of the crank connection rod mechanism can be reduced, so that the force load of the crank connection rod mechanism is reduced greatly, the service lives of all bearings of the crank shaft are prolonged, and the cost is reduced.

Description

The lubricating structure in engine cylinder inner carrier skirt section

Technical field

The invention belongs to technical field of engines, particularly relate to a kind of 157FMJ-2 motor, specifically relate to a kind of lubricating structure of 157FMJ-2 engine cylinder inner carrier skirt section.

Background technique

157FMJ-2 motor comprises crankcase body 1, bent axle 2 is provided with in crankcase body 1, the side of crankcase body 1 is provided with cylinder block 3, piston is provided with in cylinder block 3, piston is connected with the crank section of bent axle 2 by connecting rod 4, forms connecting rod, when bent axle 2 is rotated counterclockwise, the lubricant oil of box house is splashed to crank tangent direction on the sidewall of cylinder block 3 airintake direction, and the waste gas produced in cylinder block 3 is discharged by the waste gas mouth of cylinder top cover.Piston skirt and cylinder wall contact guidance piston reciprocating in cylinder, and bear the side pressure of cylinder wall to it, the piston skirt of current 157FMJ-2 motor is owing to can not get fully effective lubrication, therefore frictional force and the frictional loss of piston is increased, under the condition of equal piston mass and skirt section area, the power of motor reduces greatly; In addition, the side pressure be subject in piston skirt increases, its frictional force be subject to also significantly increases, and piston wear is accelerated, and connecting rod power load increases, and reduces the working life of each bearing of bent axle, adds cost.

Summary of the invention

For the deficiencies in the prior art, the problem that the present invention solves is, 157FMJ-2 motor can not get sufficient lubrication because of piston skirt, and the frictional force making piston be subject to and frictional loss increase, the power reduction of motor, the load of crank-connecting rod reciprocator increases, the working life of each bearing of bent axle is low, high in cost of production defect, a kind of lubricating structure of engine cylinder inner carrier skirt section is provided, piston skirt is made to have sufficient lubricant oil, reduce frictional force and the frictional loss of piston, improve the power of motor, the inertia amplitude of whole crank-connecting rod reciprocator is significantly reduced, improve the working life of each bearing of bent axle, reduce costs.

In order to solve the problems of the technologies described above, present invention employs following technological scheme:

A kind of the lubricating structure in engine cylinder inner carrier skirt section, comprise crankcase body, be provided with bent axle in described crankcase body, the side of crankcase body is provided with cylinder block, is provided with piston in described cylinder block, and piston is connected by the crank section of connecting rod with described bent axle, forms connecting rod; The sidewall of cylinder block airintake direction offers oilhole, when bent axle is rotated counterclockwise, the lubricant oil of crankcase body inside enters connnecting rod big end by the oil leab in crank, flowed out by the sideshake of connnecting rod big end again, splash to cylinder block along crank tangent direction, and be directly splashed on piston skirt by the oilhole in cylinder block, the Main thrust face of piston skirt is lubricated.

Further, described oilhole is rectangular opening, and its width is 15mm, is highly 5mm.

Further, the drift angle of described oilhole is fillet.

Beneficial effect of the present invention is:

The present invention adds oilhole at the airintake direction of cylinder block, during engine operation, bent axle is rotated counterclockwise, the lubricant oil of crankcase body inside is splashed to cylinder block along crank tangent line, and be directly splashed on piston skirt by the oilhole in cylinder block, the Main thrust face of piston skirt is lubricated, makes piston skirt have sufficient lubricant oil, be conducive to the formation of lubricant film, reduce frictional force and frictional loss that piston is subject to; Simultaneously due to the improvement of piston lubrication, the frictional force that piston is subject to reduces, and therefore under the condition of equal piston mass and skirt section area, can significantly improve the power of motor; The side pressure be subject in piston skirt in addition increases, the frictional force that piston is subject to but increases not quite, reduces the power load of connecting rod, and the power load of whole connecting rod is significantly reduced, improve the working life of each bearing of bent axle, reduce cost.

accompanying drawing explanation

Fig. 1 is the erection drawing of 157FMJ-2 engine crankshaft box of the present invention, bent axle and cylinder block three;

Fig. 2 is the structural drawing of cylinder block of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

See accompanying drawing, a kind of the lubricating structure in engine cylinder inner carrier skirt section, comprise crankcase body 1, be provided with bent axle 2 in crankcase body 1, the side of crankcase body 1 is provided with cylinder block 3, is provided with piston in cylinder block 3, and piston is connected with the crank section of bent axle 2 by connecting rod 4, forms connecting rod; The sidewall of cylinder block 3 airintake direction offers oilhole 31, during engine operation, bent axle 2 is rotated counterclockwise, the lubricant oil of crankcase body 1 inside is splashed in cylinder block 3 along crank tangent line, and enter in cylinder block 3 by oilhole 31, lubricate piston skirt, the waste gas produced in cylinder block 3 is in addition discharged by the waste gas mouth of cylinder top cover.

Preferably, oilhole 31 is rectangular opening, and the shape of rectangle oilhole is comparatively simple, is convenient to size Control and processing; The width of oilhole 31 is 15mm, is highly 5mm, and the too wide piston ring that will cause of oilhole width assembles difficulty, and easily scratches ring surface, and the guidance quality of piston is also deteriorated; Oilhole width is too narrow, and the splash lubrication oil mass being arrived piston skirt by oilhole will be reduced, and greasy property reduces; The excessive height of oilhole, the guidance quality of piston skirt will be deteriorated, and piston runs noise will become large; Oilhole height dimension is too little, will reduce over pasta and amass, and the lubricant oil being arrived piston skirt by oilhole will be reduced, and reduces greasy property; The pros and cons of comprehensive each side, this determining oilhole is of a size of the best.

Preferably, the drift angle of oilhole 31 is fillet, in working stroke, combustion gas pressure of explosion puts on piston-top surface, a part for this power passes to crank by connecting rod, a part is stored by inertia, another part passes to cylinder liner by the thruster of piston skirt, tangential and the radial direction of cylinder liner is all subject to larger stress, this will cause the stress of oilhole drift angle to concentrate, if the drift angle of oilhole is fillet, stress concentration degree is little, if acute angle, it will be very serious that stress is concentrated, after running a period of time, to crackle be there is in acute angle, and then cause cylinder sleeve fracture failure.Therefore, from reliability consideration, the drift angle selecting oilhole is fillet.

Finally it should be noted that, above embodiment is only in order to illustrate technological scheme of the present invention but not restriction technologies scheme, although claimant's reference preferred embodiment is to invention has been detailed description, those of ordinary skill in the art is to be understood that, those are modified to technological scheme of the present invention or equivalent replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.

Claims

1. one kind the lubricating structure in engine cylinder inner carrier skirt section, comprise crankcase body (1), bent axle (2) is provided with in described crankcase body (1), the side of crankcase body (1) is provided with cylinder block (3), described cylinder block is provided with piston in (3), piston is connected with the crank section of described bent axle (2) by connecting rod (4), form connecting rod, it is characterized in that, the sidewall of cylinder block (3) airintake direction offers oilhole (31), when bent axle (2) is rotated counterclockwise, the lubricant oil of crankcase body (1) inside flies out along crank tangent direction, be splashed on piston skirt by the oilhole (31) in cylinder block (3), piston skirt is lubricated.

2. according to claim 1 the lubricating structure in engine cylinder inner carrier skirt section, it is characterized in that, described oilhole (31) is rectangular opening, and its width is 15mm, is highly 5mm.

3. according to claim 2 the lubricating structure in engine cylinder inner carrier skirt section, it is characterized in that, the drift angle of described oilhole (31) is fillet.