CN201121527Y

CN201121527Y - Automatic pressure reducing device of fuel oil booster vehicle engine

Info

Publication number: CN201121527Y
Application number: CNU2007200397774U
Authority: CN
Inventors: 杨辉; 刘小川; 周春霞
Original assignee: WUXI CITY SIDADON VEHICLE AND ENGINE CO Ltd
Current assignee: WUXI CITY SIDADON VEHICLE AND ENGINE CO Ltd
Priority date: 2007-06-08
Filing date: 2007-06-08
Publication date: 2008-09-24
Anticipated expiration: 2017-06-08

Abstract

The utility model relates to an automatic decompressor of a fuel moped engine, which is improved and designed by aiming at the problem that a reducing valve switch is inconvenient and not reliable through being operated by a hand handle. The automatic decompressor is composed of an exhaust valve, a rocker arm, an offsetting spring, as well as push rod, a supporting canister, and a cam, and is characterized in that the shaft of the cam is provided with an isolator which is provided with a body with a through hole, the lateral wall of the body is provided with a lug boss, one side of the through hole is provided with a groove, the bottom surface of the groove is an inclined plane, the groove is provided with a cylindrical roller and a spring inside, the other side of the through hole is a cam body which is convex outwards, and a cylinder body is provided with a check plate. When stalling, the fuel moped engine of the utility model can be automatically decompressed, thereby being convenient and reliable.

Description

The automatic pressure-reducing device of engine of fuel bicycle

Technical field

The utility model relates to the fuel bicycle four stroke engine, relates in particular to its decompressor.

Background technique

When the fuel bicycle four stroke engine is stopped working, piston is in the compression stroke position of resistance maximum, when starting once more, the piston resistance is very big, just need open exhaust valve by reduction valve this moment, reduce the pressure in firing chamber and the cylinder, to the resistance to compression pression of piston, be beneficial to start the up of moment piston when reducing to start.Behind the crankshaft operation, when entering next circuit exhaust stroke, exhaust valve resets under spring action and cuts out, and reduction valve is closed, and makes to start the function normal starting.

Reduction valve of the prior art comprises that an end is installed on the exhaust valve between firing chamber and the air outlet flue, and an end of the other end of exhaust valve and a rocking arm is abutted against; The valve shaft of device reduction valve in the cylinder head wall body, valve shaft one end and the one end activity of described rocking arm are abutted against, the other end of valve shaft connects torsion spring and slewing gear; the other end of rocking arm and push rod and cam gear are abutted against; oppress rocking arm by the rotation of handling valve shaft; rocking arm is oppressed also and opened exhaust valve, so controls the unlatching of reduction valve or closes.

Above-mentioned reduction valve is the rotation of handling valve shaft by the pulling one handle, for example technological scheme among the Chinese patent 200620072713.X in the prior art.Stick control is not only inconvenient, and unreliable, if misoperation or handle return are untimely, motor can't start.

The model utility content

At above-mentioned reduction valve switch by stick control inconvenient and insecure problem, the applicant has carried out research and has improved, and changes the manual control device of reduction valve, and a kind of automatic pressure-reducing device of convenient and reliable engine of fuel bicycle is provided.

In order to solve the problems of the technologies described above, the utility model adopts following technological scheme:

The automatic pressure-reducing device of engine of fuel bicycle, it comprises that an end is installed on the exhaust valve between combustion chamber of air cylinder and the exhaust passage, one end of the other end of exhaust valve and rocking arm is abutted against, between exhaust valve and the cylinder block return spring is installed; the other end of rocking arm and push rod; top tube; cam is abutted against in proper order; the axle of described cam is gone up device one-way element; described one-way element has a body that has through hole; on the sidewall of described body small boss is arranged; the side at described through hole has groove; the bottom surface of groove is the plane of inclination; device roller and spring in groove; the opposite side at described through hole is the cam body of evagination, and device has check plate on the cylinder block, and check plate is positioned at the below of described one-way element.

Technique effect of the present utility model is: during engine misses, piston is in compression stroke, and the top socket joint touches the base circle portion of cam, exhaust valve closing; When resistance to compression pression discharges, descent of piston causes the camshaft counter-rotating, and the one-way element on the camshaft combines with camshaft at this moment, backward rotation together, the cam body of evagination and top socket joint touch on the one-way element, and it is up to promote the top tube, drives push rod, rocking arm, the compression exhaust door, exhaust valve is opened, and the motor next time of starting smoothly is convenient in decompression automatically.

Description of drawings

Structural representation of the present utility model when Fig. 1 is the motor proper functioning;

Fig. 2 is an A place enlarged view among Fig. 1;

Structural representation of the present utility model when Fig. 3 is engine misses;

Fig. 4 is a B place enlarged view among Fig. 3;

Fig. 5 is the schematic representation of the utility model convexity wheel shaft and one-way element assembly structure;

Fig. 6 is the schematic representation of one-way element assembly structure in the utility model;

Fig. 7 is the sectional view of one-way element body in the utility model;

Fig. 8 is that the K of Fig. 7 is to view.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is further described.

As shown in Figure 1, the utility model comprises that an end is installed on the exhaust valve 9 between combustion chamber of air cylinder 10 and the exhaust passage 8, and an end of the other end of exhaust valve 9 and rocking arm 6 is abutted against, and return spring 7 is installed between exhaust valve 9 and the cylinder block 11; The other end of rocking arm 6 and push rod 5, top tube 4, cam 3 orders are abutted against.See Fig. 5 to Fig. 8, device one-way element 2 on the axle 15 of cam 3, one-way element 2 has a body 16 that has through hole 21, a small boss 13 is arranged on the sidewall of body 16, side at through hole 21 has three grooves 20, and the bottom surface of groove 20 is plane of inclination 19, device roller 17 and spring 18 in groove 20, opposite side at through hole 21 is the cam body 14 of an evagination, has angle (this angle shown in Figure 8 is greater than 90 °) between the projection of cam body 14 and the small boss 13.See Fig. 1 and Fig. 2, device has check plate 1 on the cylinder block 11, and check plate 1 is positioned at the below of one-way element 2, and the top of check plate 1 has projection 22.

The working principle of one-way element 2 is: see Fig. 5 and Fig. 6, when axle 15 clockwise directions of cam 3 rotated, axle 15 drove the gradually cross direction pressure spring 18 of rollers 17 to groove 20, at this moment, axle 15 separates with one-way element 2, and axle 15 can rotate freely, and one-way element 2 is not worked; When camshaft 15 counterclockwise rotated, camshaft 15 drove roller 17 and moves to the gradually narrow direction of groove 20, and roller 17 is stuck between the bottom land and camshaft 15 of groove 20, and at this moment, one-way element 2 is abutted against with camshaft 15, and both are rotation counterclockwise together.

Working procedure of the present utility model: during the motor proper functioning, see Fig. 1, Fig. 2 and Fig. 5, camshaft 15 separates with one-way element 2, small boss 13 on one-way element body 16 sidewalls is under the restriction of the projection on the check plate 1 22, the cam body 14 of one-way element 2 is in the position of next-door neighbour top tube 4, axle 15 rotates freely, and one-way element 2 is not worked.Be in compression stroke during engine misses, see Fig. 3 and Fig. 4, this moment, piston 12 was up by inertia, and intake valve or exhaust valve 9 are closed, and firing chamber 10 internal pressures strengthen gradually, stop piston 12 up, up to stopping, then again under this pressure, promote piston 12 descending a section, camshaft 15 counter-rotatings this moment, one-way element 2 is abutted against with camshaft 15, and both are backward rotation together, and the cam body 14 on the one-way element 2 contacts with top tube 4, it is up to promote top tube 4, drive push rod 5, rocking arm 6, compression exhaust door 9, exhaust valve 9 is opened, automatically decompression.

Claims

1. the automatic pressure-reducing device of engine of fuel bicycle, it comprises that an end is installed on the exhaust valve between combustion chamber of air cylinder and the exhaust passage, one end of the other end of exhaust valve and rocking arm is abutted against, between exhaust valve and the cylinder block return spring is installed; the other end of rocking arm and push rod; top tube; cam is abutted against in proper order; the axle that it is characterized in that described cam is gone up device one-way element; described one-way element has a body that has through hole; on the sidewall of described body small boss is arranged; the side at described through hole has groove; the bottom surface of groove is the plane of inclination; device roller and spring in groove; the opposite side at described through hole is the cam body of evagination, and device has check plate on the cylinder block, and check plate is positioned at the below of described one-way element.

2. according to the automatic pressure-reducing device of the described engine of fuel bicycle of claim 1, it is characterized in that having angle between the cam body of small boss on the described one-way element body sidewall and described one-way element body through-holes opposite side, the top of described check plate has projection.