CN201474777U

CN201474777U - Motorcycle engine

Info

Publication number: CN201474777U
Application number: CN2009201922453U
Authority: CN
Inventors: 陆永波; 祝强; 卢业刚; 阚继烈; 许浩锰; 徐勇; 罗春林; 肖兵
Original assignee: Ningbo Longjia Motorcycle Co Ltd
Current assignee: Ningbo Longjia Motorcycle Co Ltd
Priority date: 2009-08-25
Filing date: 2009-08-25
Publication date: 2010-05-19
Anticipated expiration: 2019-08-25

Abstract

The utility model discloses a motorcycle engine which comprises an air cylinder, an air cylinder cover, a piston arranged in the air cylinder, a connecting rod and a crank, wherein the small end of the connecting rod is connected on the piston through a piston pin, the big end of the connecting rod is connected on the connecting rod neck of the crank, the axial central line of the piston pin leans to the side of the main stress surface of the piston relative to the axial central line of the piston, and the offset of the longitudinal central line of the air cylinder is bigger than the that of the axial central line of the piston pin. In general, the piston leans to the secondary stress surface of the piston, the axial central line of the piston pin leans to the side of the main stress surface of the piston, and the sound of piton knocking can be lowered; and the longitudinal central line of the air cylinder leans to the side of the secondary stress surface of the piston, and the thrust of the inner wall of the air cylinder forcing on the piston can be weakened so as to reduce the friction, lower the heat generation value, prolong the service life of the engine and improve efficient filtration and torque.

Description

A kind of motorcycle engine

(1) technical field

The utility model relates to a kind of motorcycle engine.

(2) background technique

Present motor vehicular engine on the market, its crank center line and cylinder centerline are handed on one point.About the deflection main stress face 1mm of piston center.She Ji purpose is the sound for reduction piston knock cylinder in the piston motion commutation like this, but the adverse consequences of bringing is the frictional force increase in working stroke piston and cylinder block, reduces the moment of torsion of working stroke, increases the heating value of motor.

(3) summary of the invention

Little in order to overcome existing motorcycle engine power moment of torsion, the deficiency that frictional loss is big, the utility model provides a kind of power moment of torsion that improves motor, reduces the motor heating value, improves the motorcycle engine in its life-span.

The technical scheme in the invention for solving the technical problem is: a kind of motorcycle engine, comprise cylinder, cylinder head, be positioned at the piston of described cylinder, connecting rod, crank, the small end of described connecting rod is connected on the described piston by wrist pin, the big end of described connecting rod is connected on the connecting rod neck of bent axle, it is characterized in that: the longitudinal center line of described wrist pin is partial to main stress face one side of piston with respect to the longitudinal center line of piston, the vertical center line of described cylinder is partial to inferior stress surface one side of piston with respect to the center line of described crank, the side-play amount of the vertical center line of cylinder is greater than the side-play amount of the longitudinal center line of wrist pin.

Further, the longitudinal center line of described wrist pin is partial to the main stress face one side 0.5mm of piston with respect to the longitudinal center line of piston, and the vertical center line of described cylinder is partial to the inferior stress surface one side 3mm of piston with respect to the center line of described crank.

The beneficial effects of the utility model are: piston is partial to the inferior stress surface of piston on the whole, and the longitudinal center line of wrist pin is partial to main stress face one side of piston, can reduce the sound of piston knock; Inferior stress surface one side of the vertical center line deflection piston of cylinder can reduce the thrust that cylinder inner wall imposes on piston, thereby the working life, the raising that reduce friction, reduce heating value, increase motor are effectively filtered and moment of torsion.

(4) description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is force analysis figure of the present utility model.

(5) embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

With reference to Fig. 1, a kind of motorcycle engine, comprise cylinder 1, cylinder head, be positioned at piston 2, connecting rod 3, the crank 4 of described cylinder 1, the small end of described connecting rod is connected on the described piston by wrist pin 5, the big end of described connecting rod 3 is connected on the connecting rod neck of bent axle, the longitudinal center line of described wrist pin 4 is partial to the main stress face 6 one side 0.5mm of piston with respect to the longitudinal center line of piston 2, the vertical center line of described cylinder 1 is partial to the inferior stress surface 7 one side 3mm of piston 2 with respect to the center line of described crank.Piston is partial to the inferior stress surface one side 2.5mm of piston on the whole.

With reference to Fig. 2, be working stroke this moment, and piston is subjected to the effect of gas blow-through pressure F, and this active force makes gas blow-through pressure F and link supports power F2 with joint efforts piston push cylinder under the support force F2 of connecting rod effect, and cylinder inner wall is to thrust F1 of piston.The distance D that work as wrist pin center and crank center this moment is big more, then cylinder inner wall gives the thrust F1 of piston more little, just have more gas blow-through pressure F to affact the moment of torsion that is produced as motor on the crank (5), frictional loss simultaneously is more little, and the motor heating value is more little.

Claims

1. motorcycle engine, comprise cylinder, cylinder head, be positioned at the piston of described cylinder, connecting rod, crank, the small end of described connecting rod is connected on the described piston by wrist pin, the big end of described connecting rod is connected on the connecting rod neck of bent axle, it is characterized in that: the longitudinal center line of described wrist pin is partial to main stress face one side of piston with respect to the longitudinal center line of piston, the vertical center line of described cylinder is partial to inferior stress surface one side of piston with respect to the center line of described crank, the side-play amount of the vertical center line of cylinder is greater than the side-play amount of the longitudinal center line of wrist pin.

2. motorcycle engine as claimed in claim 1, it is characterized in that: the longitudinal center line of described wrist pin is partial to the main stress face one side 0.5mm of piston with respect to the longitudinal center line of piston, and the vertical center line of described cylinder is partial to the inferior stress surface one side 3mm of piston with respect to the center line of described crank.