CN2303930Y - Balancing-type four-stroke engine axial-cam - Google Patents

Abstract

The utility model discloses a balance type four-stroke engine cam shaft which is characterized in that a balance cam is added on a shaft (1) of one end of an intake valve cam (3) on the basis of the cam shaft of a four-stroke engine, and the cam shaft of the four-stroke engine is used at present. The convex top (7) of the balance cam (2) is arranged between the convex tops (5) and (6) of the intake valve cam (3) and an exhaust value cam (4), and the main body (8) of the balance cam (2) has a balance weight function. When the utility model is used, the utility model is additionally provided with a balance spring and a balance rocker arm to cause the cam shaft to be stable and reliable in a rotation process. The utility model has long service life and fuel saving, and reduces vibration. The balance type four-stroke engine cam shaft can be widely used for four-stroke engines of automobiles, motorcycles, etc.

Description

Balanced type four stroke engine camshaft

The utility model relates to the improvement of four stroke engine camshaft, and specifically a kind of balanced type four stroke engine camshaft is applicable to automobile, motorcycle four-stroke engine.

The camshaft that is used for automobile, motorcycle four-stroke engine at present, an inlet valve cam that go up to be provided with by axle and axle, exhaust valve cam etc. are partly formed, and what have has also added a balance weight iron.In camshaft rotation work process, when inlet valve cam was worked, inlet valve cam pushed rocking arm, compression valve spring and valve stem, cylinder piston is descending, produce suction, the IO Intake Valve Opens air inlet, at this moment, exhaust valve cam is not worked, when inlet valve rocker did not stress, valve spring resetted, piston stroking upward, this moment, intake valve and exhaust valve were closed condition, when exhaust valve cam was started working, piston had reached top dead center, when igniting breaks out, the descent of piston work done, and the arrival lower dead center, exhaust valve is deflated a cam and pushes exhaust valve rocker arm, the exhauxt valve opens combustion gas.When exhaust valve cam turns to the inoperative position, the exhaust valve spring reset, the four-stroke working procedure is finished in exhaust valve closing one time.As can be seen, during cam compression valve spring, valve return can be given reaction force of cam in this process, play certain prevention running, expend certain fuel, simultaneously, when valve return resets, can give positive interaction power of cam, make cam accelerate running, produce certain unstability, increase noise, be easy to generate bump between valve and the cylinder head, increased vibration.

The balanced type four stroke engine camshaft that the purpose of this utility model provides the present four stroke engine camshaft energy fuel saving that uses of a kind of ratio, alleviates vibration, reduction noise.

The utility model is achieved in that on the basis of the four stroke engine camshaft that uses at present, keep original inlet valve cam and exhaust valve cam, on an end axle of inlet valve cam, set up equilibrium cam, the protruding of equilibrium cam withstands between protruding top of inlet valve cam and the protruding top of exhaust valve cam, the equilibrium cam main body is a semicircular ring, make the centre-of gravity shift axle center, so equilibrium cam had both played balance weight iron, play action of cam again, simultaneously, on cylinder head, increase a balance spring, be connected by the balance rocking arm between balance spring and the equilibrium cam, equilibrium cam is during to the work done of balance rocking arm, balance spring compression, valve spring return, during the balance spring return, the exhaust valve cam work done, the exhaust valve length of spring compressed is during exhaust valve spring return, not work done of equilibrium cam, balance spring also is in the return state, so just makes the four stroke engine camshaft realize equilibrium of forces in operation process, has increased stability.

Compare with the four stroke engine camshaft of present use, the utility model has the advantages that: stability is high in the working procedure, long service life, and fuel saving has alleviated vibration, has reduced noise.

Accompanying drawing 1: be plan view of the present utility model

Accompanying drawing 2: be plan view of the present utility model

Accompanying drawing 3: be the utility model working state schematic representation

Below in conjunction with accompanying drawing the utility model is described in detail.

Balanced type four stroke engine camshaft is once rolling after fine finishing forms with Special Equipment and mould, is made up of axle 1, equilibrium cam 2, inlet valve cam 3, exhaust valve cam 4.Its axle 1, inlet valve cam 3, exhaust valve cam 4 is the same with the four stroke engine camshaft that uses at present, the protruding top 5 of inlet valve cam 3 and exhaust valve cam 4, the angle of 6 radiuses is about 90 °, the protruding top 7 of equilibrium cam 2 will be in the protruding top 5 of inlet valve cam 3 and 6 centres, protruding top of exhaust valve cam 4, the angle that is protruding top 6 radiuses of protruding top 7 radiuses of equilibrium cam 2 and inlet valve cam 3 protruding top 5 radiuses and exhaust valve cam 4 all is about 45 °, protruding top 5,6,7 radius is all equally big, the main body 8 of equilibrium cam 2 is a semicircular ring, the semicircular ring radius is identical with protruding top 7 radiuses, make the center portion of the deviation of gravity center axle 1 of equilibrium cam 2, and the opposite direction on the protruding top 7 of equilibrium cam 2 is to have reached the purpose of counterweight effect.When using the utility model, need to increase balance spring 9 of installation, balance rocking arm 10, balance rocker shaft 11, balance spring 9 can be positioned on the cylinder head 12, the rotating shaft 11 of balance rocking arm 10 can with one of inlet valve rocker 13 rotating shaft, balance rocking arm 10 1 ends are positioned on the top of balance spring 9, one end, can use after installing along equilibrium cam 2 sliding contacts.

Claims (3)

1, a kind of balanced type four stroke engine camshaft is made up of axle (1), inlet valve cam (3), exhaust valve cam parts such as (4), it is characterized in that having increased an equilibrium cam (2) on an end axle (1) of inlet valve cam (3).

2, balanced type four stroke engine camshaft according to claim 1 it is characterized in that the protruding top (7) of equilibrium cam (2) and inlet and outlet door cam (3), the protruding top (5) of (4), the radius angle of (6) all are about 45 °, and radius is all equally big.

3, balanced type four stroke engine camshaft according to claim 1, the main body (8) that it is characterized in that equilibrium cam (2) is semi-annular shape, the semicircular ring radius is identical with protruding top (7) radius, make the center portion of the deviation of gravity center axle (1) of equilibrium cam (2), and at the opposite direction of protruding top (7).