CN202001484U

CN202001484U - Light crankshaft of petrol engine

Info

Publication number: CN202001484U
Application number: CN2011200875575U
Authority: CN
Inventors: 张兴海; 段伟; 刘维; 汪开银
Original assignee: Chongqing Sokon Automobile Industry Group Co Ltd
Current assignee: Chongqing Sokon Industry Group Co Ltd
Priority date: 2011-03-29
Filing date: 2011-03-29
Publication date: 2011-10-05
Anticipated expiration: 2021-03-29

Abstract

The utility model discloses a light crankshaft of a petrol engine. The light crankshaft comprises a timing shaft journal, a main shaft journal, a connecting rod journal, a crank, a balance block and a flywheel ring flange, wherein the balance block is a double-lug balance block; the end face of the outer side of the balance block has a circular-arc structure coaxial with the main shaft journal; and two transverse sides of the balance block corresponding to a balance mass point of the balance block are provided with unloading grooves. In the utility model, weight transversely opposite to the balance mass point of the balance block is removed, and the balance mass point of the balance block is close to the central line of a crankshaft journal, so that the structural intensity of the balance block can be ensured, the gravity center of a dynamic balance block is far away from the central line of the crankshaft, balancing is performed without influencing centrifugal force produced by the connecting rod journal of the crankshaft, smaller secondary reciprocating inertia force is produced, the requirement on dynamic balance is met, the mass of the balance block is reduced, the aim of reducing the weight of the crankshaft by ensuring the structural intensity of the balance block and reducing the mass of the balance block is fulfilled, the performance and economic efficiency of the engine are enhanced, and emission is reduced.

Description

Petrol engine light-type bent axle

Technical field

The utility model relates to a kind of mechanical part, particularly a kind of bent axle that is used for motor and has better balance.

Background technique

Petrol engine is the dynamic power machine that comparatively generally uses, and the energy directly is converted to power.Bent axle is the requisite parts of motor, is that the to-and-fro motion with the piston of motor converts the parts that rotate output to.Because its speed range is bigger, and have quite high rotating speed during high speed, and the power output of bent axle own belongs to eccentric output, thereby the dynamic balance of whole bent axle is its important controlling index.If dynamic balance is bad, have bigger secondary reciprocal inertia force after then rotating, increase the vibrations and the noise of motor, simultaneously, also can increase the moment of flexure that bent axle itself bears, reduce its working life.

In the prior art, to carry out balance be one of main mode that realizes crankshaft counterbalance by centrifugal force that equilibrium block produces the connecting rod neck of bent axle is set, and existing engine crankshaft dynamic balancing piece great majority are fan-shaped or ears shape, can realize the moving weighing apparatus of bent axle.But the size of equilibrium block has relation with the size of equilibrium block shape and crank throw, relative engine performance, the quality of dynamic balancing piece is the smaller the better, especially reducing engine dry weight for petrol engine requires higher, therefore to seek a optimized results with respect to this body structure, can guarantee the dynamic balancing of bent axle, it is minimum that mass of balance block is dropped to.

Though existing engine crankshaft dynamic balancing piece can be realized dynamic balancing, but when the shape of its equilibrium block of design all is by traditional thinking that instructs, setting can make bent axle reach the mass block of balance, take the global formation structure, ignore the increase of equilibrium block to the bent axle deadweight, under the strict demand that the raising and the reduction of engine performance itself and Economy thereof are discharged, need improve balance block structure.

Therefore, need improve existing engine crankshaft, reduce mass of balance block as far as possible, can guarantee the structural strength of equilibrium block, the center of gravity that makes the dynamic balancing piece satisfies requirement for dynamic balance as far as possible away from the center line of bent axle, has less secondary reciprocal inertia force, can also reduce mass of balance block, thereby make the bent axle lightweight, improve performance, Economy and the reduction discharging of motor.

The model utility content

In view of this, the utility model provides a kind of petrol engine light-type bent axle, reduce mass of balance block as far as possible, can guarantee the structural strength of equilibrium block, the center of gravity that makes the dynamic balancing piece satisfies requirement for dynamic balance as far as possible away from the center line of bent axle, has less secondary reciprocal inertia force, can also reduce mass of balance block, thereby make the bent axle lightweight, improve performance, Economy and the reduction discharging of motor.

Petrol engine light-type bent axle of the present utility model, comprise timing axle journal, main journal, connecting rod neck, crank, equilibrium block and flywheel flange plate, described equilibrium block is an ears type equilibrium block, equilibrium block outside end face is and the arc structure of main journal coaxial line it is characterized in that: the both lateral sides that described equilibrium block is corresponding with its balance particle has spron.

Further, symmetry between two of described equilibrium block sprons;

Further, described spron is the horizontal bar-shaped trough that axially connects;

Further, described spron is the horizontal bar-shaped trough of axial non-perforation;

Further, described horizontal bar-shaped trough is made of the curved surface that seamlessly transits.

The beneficial effects of the utility model: petrol engine light-type bent axle of the present utility model, remove on the equilibrium block and the horizontal relative weight of its balance particle, because the balance particle of equilibrium block approaches the center line of crankshaft journal, thereby can guarantee the structural strength of equilibrium block, the center of gravity of dynamic balancing piece is tried one's best away from the center line of bent axle, do not influence the centrifugal force that the connecting rod neck of bent axle is produced and carry out balance, has less secondary reciprocal inertia force, satisfy requirement for dynamic balance, reduced mass of balance block simultaneously, reach the structural strength that both guarantees equilibrium block, can also reduce mass of balance block, thereby make the light-weighted purpose of bent axle, improve the performance of motor, Economy and reduction discharging.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is first kind of embodiment's of the utility model a structural representation;

Fig. 2 be Fig. 1 along A-A to sectional view;

Fig. 3 is second kind of embodiment's of the utility model a structural representation;

Fig. 4 be Fig. 3 along B-B to sectional view.

Embodiment

Fig. 1 is first kind of embodiment's of the utility model a structural representation, Fig. 2 be Fig. 1 along A-A to sectional view, as shown in the figure: the petrol engine light-type bent axle of present embodiment, comprise timing axle journal 5, main journal 1, connecting rod neck 2, crank 6, equilibrium block 3 and flywheel flange plate 4, described equilibrium block 3 is an ears type equilibrium block, equilibrium block 3 outside end faces are and the arc structure of main journal 1 coaxial line that the both lateral sides that described equilibrium block 3 is corresponding with its balance particle has spron; When the balance particle is meant crankshaft operation, reach the point of balance by bent axle footpath centrifugal force and equilibrium block 3 centrifugal force, generally be positioned near the central axis of main journal 1, Design Theory should be positioned at main journal 1 axis; Shown in the figure, in the present embodiment, described bent axle is the four cylinder engine bent axle, equilibrium block 3 and crank 6 quantity corresponding relative be eight; In the practical application, because balance mainly is inertial force and moment from radially, thereby considers balance so long as the connecting rod neck distributes according to prior art, then the above-mentioned size in the present embodiment can be used in the engine crankshaft of same displacement; Described crankshaft material is QT700-3.

In the present embodiment, symmetry between two sprons of described equilibrium block 3; Make bent axle in rotation process, can guarantee horizontal balance, and raise the efficiency in the course of working.

In the present embodiment, described spron is the horizontal bar-shaped trough 3a of axial non-perforation, can guarantee the intensity of equilibrium block, avoids occurring the inefficacy in the operation process, working life extended period.

In the present embodiment, described horizontal bar-shaped trough 3a is made of the curved surface that seamlessly transits; Seamlessly transit to be beneficial to and eliminate stress concentratedly, avoid occurring or the crackle diffusion in later stage.

Fig. 3 is second kind of embodiment's of the utility model a structural representation, Fig. 4 be Fig. 3 along B-B to sectional view, as shown in the figure: present embodiment and embodiment's one difference only is: the horizontal bar-shaped trough 3a of the spron 3b of present embodiment for axially connecting; Adopt the structure that axially connects, can remove excess weight to greatest extent, obtained the bent axle of light weight.

Explanation is at last, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1. petrol engine light-type bent axle, comprise timing axle journal, main journal, connecting rod neck, crank, equilibrium block and flywheel flange plate, described equilibrium block is an ears type equilibrium block, equilibrium block outside end face is and the arc structure of main journal coaxial line it is characterized in that: the both lateral sides that described equilibrium block is corresponding with its balance particle has spron.

2. petrol engine light-type bent axle according to claim 1 is characterized in that: symmetry between two sprons of described equilibrium block.

3. petrol engine light-type bent axle according to claim 2 is characterized in that: the horizontal bar-shaped trough of described spron for axially connecting.

4. petrol engine light-type bent axle according to claim 2 is characterized in that: described spron is the horizontal bar-shaped trough of axial non-perforation.

5. according to claim 3 or 4 described petrol engine light-type bent axles, it is characterized in that: described horizontal bar-shaped trough is made of the curved surface that seamlessly transits.