CN2325517Y

CN2325517Y - Device for controlling air inlet/outlet valve of four-stroke engine

Info

Publication number: CN2325517Y
Application number: CN 97222317
Authority: CN
Inventors: 黄思铭; 徐国贵; 陈庆祺
Original assignee: Sanyang Industry Co Ltd
Current assignee: Sanyang Industry Co Ltd
Priority date: 1997-07-21
Filing date: 1997-07-21
Publication date: 1999-06-23
Anticipated expiration: 2007-07-21

Abstract

The utility model relates to a device for controlling air inlet/outlet valves of a four-stroke engine. The utility model is arranged on a cylinder with a cylinder end. The utility model comprises a crank shaft, a timing chain, a camshaft which is driven by the crank shaft through the timing chain, a push rod which is contacted with the camshaft to do reciprocating movement, a rocker arm, wherein, one end of which is contacted with the push rod to rotate, and air inlet/outlet valves which are contacted with the other end of the rocker arm to do reciprocating movement, wherein, the camshaft and the push rod are arranged on the cylinder end.

Description

The four-stroke engine device for controlling air inlet valve and air outlet valve

The utility model relates to a kind of light and handy succinct, machining accuracy can not produce the four-stroke engine device for controlling air inlet valve and air outlet valve of variation and air valve switch precise control.

See also existing overhead valvetrain assembly shown in Figure 1 (OHV), it is configured in inlet and

outlet valve

15,16 on the cylinder head 18, camshaft 11 is placed on cylinder block 17 float chambers, utilize 11 rotations of gear driven camshaft by bent axle 19, this camshaft 11 drives push rod 12 and does upper and lower motion, so that producing around axle, rocking arm 14 rotatablely moves, and then the time of control inlet and

outlet valve

15,16 open and close.

Yet this OHV mechanism need have bigger space and quite long length to dispose push rod, if configuration space is big, engine weight is increased, and outward appearance will be more huge; If push rod length is long, its relative weight is also big, not only causes the vibrations and the noise of air inlet and exhaust valve, more influences the sensitivity of air inlet and exhaust valve mechanism action, causes the variation of four-stroke engine performance.

See also existing overhead cam axis mechanism shown in Figure 2 (OHC), it is configured in inlet and

outlet valve

25,26 on the cylinder head 28, utilize timing chain 23 or train of gearings mode to drive camshaft 21 by bent axle 29, this camshaft 21 directly drives rocking arm 24 generations and rotatablely moves, and then the time of control inlet and

outlet valve

25,26 open and close.

Yet the design that is configured in of this OHC mechanism is gone up restriction greatly, the also difficult control of machining accuracy; For design limit, camshaft rotating center, rocking arm rotating center and air inlet and exhaust valve top endface position must be through repeatedly adjusting repeatedly, and need have suitable experience just can obtain the optimum position, and expend self-evident man-hour; For the difficult control of machining accuracy, the configuration of its intake and exhaust valve seat, air inlet and exhaust valve conduit all becomes a special angle with horizontal plane, processing on can not by drawing directly read size, need the new data after conversion just can import manufacturing equipment row processing again, data after conversion must with former design size difference to some extent, its finished product accuracy is also influenced relatively, then causes the variation of the time of air inlet and exhaust valve open and close, influences the performance of four-stroke engine.

The purpose of this utility model is to provide a kind of light and handy succinct, machining accuracy can not produce the four-stroke engine device for controlling air inlet valve and air outlet valve of variation and air valve switch precise control.

The purpose of this utility model is to realize like this, a kind of four-stroke engine device for controlling air inlet valve and air outlet valve promptly is provided, be arranged on the cylinder with cylinder head, the camshaft that it comprises bent axle, timing chain, driven through described timing chain by described bent axle, the described camshaft of contact and reciprocating push rod, the described push rod of an end in contact and produce the other end of rocking arm, the described rocking arm of contact of rotation and reciprocating inlet and outlet valve, described camshaft and push rod are arranged on the described cylinder head.

The advantage of the utility model device is, not only can make the configuration of engine interior mechanism more easy than OHC mechanism, outward appearance is more succinct, and more can shorten the length and the weight thereof of push rod in the OHV mechanism, and then make the air inlet and exhaust valve control mechanism more sensitive, and reduce the influence of its vibrating noise, make the performance of four-stroke engine can reach the best level of design fully; The angle of its intake and exhaust valve seat and air inlet and exhaust valve conduit all becomes 90 degree with horizontal plane, add man-hour directly by drawing size input manufacturing equipment, the precision variation that can avoid the error of size conversion and cause has promoted the degree of accuracy of the open and close time of four-stroke engine air inlet and exhaust valve relatively.

Below in conjunction with accompanying drawing, embodiment of the present utility model is described, wherein:

Fig. 1 is existing overhead valvetrain assembly (OHV) schematic representation;

Fig. 2 is existing overhead cam axis mechanism (OHC) schematic representation;

Fig. 3 is the utility model four-stroke engine device for controlling air inlet valve and air outlet valve schematic representation.

See also an embodiment of the utility model four-stroke engine device for controlling air inlet valve and air outlet valve shown in Figure 3, it comprises bent axle 39, timing chain 33, camshaft 31, push rod 32, rocking arm 34 and inlet and outlet valve 35, wherein timing chain 33 mat sprocket wheels are connected in bent axle 39 and camshaft 31, camshaft 31 and push rod 32 all are arranged on the cylinder head 38, camshaft 31 contact push rods 32, and rocking arm 34 1 end in contact push rods 32, the other end contact inlet and outlet valve 35, and this inlet and outlet valve 35 becomes 90 degree angles with horizontal plane.

During action, utilize timing chain 33 to drive camshaft 31 rotations by bent axle 39, camshaft 31 drives push rod 32 and moves up and down, so that producing, rocking arm 34 rotatablely moves, and then the open and close time of control four-stroke engine inlet and outlet valve 35.

Because the utility model device for controlling air inlet valve and air outlet valve is arranged at camshaft 31 and push rod 32 on the cylinder head 38, not only can make the configuration of engine interior mechanism more easy than OHC mechanism, outward appearance is more succinct, and more can shorten the length and the weight thereof of push rod in the OHV mechanism, and then make device for controlling air inlet valve and air outlet valve more sensitive, and reduce the influence of vibrating noise, make the performance of four-stroke engine can reach the best level of design fully.Again at considering in the processing, the angle of its intake and exhaust valve seat and air inlet and exhaust valve conduit all becomes 90 degree with horizontal plane, add man-hour directly by drawing size input manufacturing equipment, the precision variation that can avoid the error of size conversion and cause has promoted the degree of accuracy of the open and close time of four-stroke engine air inlet and exhaust valve relatively.

Claims

1. four-stroke engine device for controlling air inlet valve and air outlet valve, be arranged on the cylinder with cylinder head, the camshaft that it comprises bent axle, timing chain, driven through described timing chain by described bent axle, the described camshaft of contact and reciprocating push rod, the described push rod of an end in contact and produce the other end of rocking arm, the described rocking arm of contact of rotation and reciprocating inlet and outlet valve, it is characterized in that described camshaft and push rod are arranged on the described cylinder head.

2. four-stroke engine device for controlling air inlet valve and air outlet valve as claimed in claim 1 is characterized in that, described inlet and outlet valve becomes 90 degree angles with horizontal plane.