CN101644212B

CN101644212B - Valve used in waste gas recycling system

Info

Publication number: CN101644212B
Application number: CN200910144896XA
Authority: CN
Inventors: 张华�
Original assignee: SAIC Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2009-09-09
Filing date: 2009-09-09
Publication date: 2012-02-15
Anticipated expiration: 2029-09-09
Also published as: CN101644212A

Abstract

The invention belongs to the technical field of automobile engine, and in particular relates to a valve used in a waste gas recycling system. The invention comprises a motor and a valve body, a rotational shaft drive device of the motor is arranged at an eccentric cam mechanism in the valve body to act, and the eccentric cam mechanism ensures the valve to be in opening or closing state. As known from the above technical scheme, the invention controls the opening degree of an EGR valve through the eccentric cam mechanism namely, the invention controls the opening of the EGR valve through molded lines of the eccentric cam, thus the invention has simple structure and high reliability.

Description

A kind of valve that is used for gas recirculation system

Technical field

The invention belongs to technical field of automobile engine, be specifically related to a kind of valve that is used for engine exhaust-gas recirculating system.

Background technique

Engine exhaust recirculation (EGR) system is used for reducing the NO of waste gas _XDischarge capacity, also promptly when motor at load down during running, the EGR opening of valves makes a spot of waste gas get into intake manifold and gets into the firing chamber with fresh air, and the exhausted air quantity of entering firing chamber increases along with the increase of engine speed and load.Because automobile exhaust gas is a kind of non-combustible gas (not containing fuel and oxygenant); In the firing chamber, do not participate in burning; Therefore the automobile exhaust gas that gets in the firing chamber reduces FT and pressure through the part heat that absorbs the burning generation, to reduce the growing amount of nitrogen oxides

EGR valve in the egr system plays crucial effects, and the EGR valve needs therefore to require the accurate positioning of EGR valve keeping certain aperture to guarantee the needed EGR amount of motor in the course of the work, and mechanism is reliable, and can adapt to its residing environment.

Summary of the invention

The purpose of this invention is to provide a kind of valve that is used for gas recirculation system, its simple structure, and can comparatively accurately realize control to valve opening.

For realizing above-mentioned purpose; The present invention has adopted following technological scheme: a kind of valve that is used for gas recirculation system; Comprise motor and valve body; The rotating shaft of described motor drives the eccentric cam mechanism action that is arranged in the valve body, and described eccentric cam mechanism makes valve be in and opens or close two states.

Can be known that by technique scheme the present invention controls the aperture of EGR valve through eccentric cam mechanism, also being the present invention controls the unlatching of EGR valve so simple structure, high reliability of the present invention through the molded lines of eccentric cam.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of the present invention that removes behind the valve drain pan;

Fig. 3 is the structural representation that closes the valve device;

Fig. 4 is the structural representation of eccentric cam;

Fig. 5 is the structural scheme of mechanism of valve internal;

Fig. 6 is the valve lift schematic representation.

Embodiment

Like Fig. 1, shown in 2; A kind of valve that is used for gas recirculation system; Comprise motor 10 and valve body 20, the rotating shaft of described motor 10 drives the eccentric cam mechanism action that is arranged in the valve body 20, and described eccentric cam mechanism makes valve be in and opens or close two states.

Further, as shown in Figure 2, described eccentric cam mechanism comprises eccentric cam 40 and closes valve device 50, and eccentric cam 40 fixed covers are located in the rotating shaft of stepper motor 10, and eccentric cam 40 drives under the effect of rotating shaft and closes valve device 50 and move with unlatching or cut-off valve.

The present invention adopts stepper motor 10 to drive eccentric cam 40 and rotates; The molded lines that cooperates eccentric cam 40; Can accurately control the aperture of EGR valve; And when engine stoping operation, can EGR valve appropriateness opened, thereby help preventing that the valve bonding from having influence on the unlatching of valve through stepper motor 10; A described end that closes valve device 50 links to each other with eccentric cam 40, and the other end is enclosed in the import or export place of EGR valve, and simple structure and transmission are effective.

Further, shown in Fig. 2～6, a side that deviates from machine shaft of described eccentric cam 40 is provided with outward extending cantilever 41; The described valve device 50 that closes comprises valve rod 51, and the top of valve rod 51 is provided with described cantilever 41 is set in chute 52 wherein, and the bottom of valve rod 51 is provided with the valve seat 53 of import or export that can closed valve 20; Described cantilever 41 makes under the effect of eccentric cam 40 and closes valve device 50 and move up and down to open or cut-off valve.

Be arranged with Returnning spring 54 on the described valve rod 51, an end of Returnning spring 54 is resisted against the lower end surface of chute 52, and the other end is fixed on the valve body 20.

As preferred version of the present invention, described valve seat 53 is enclosed in the inlet of valve body 20, can reduce automobile exhaust gas thus to valve body 20 inner impact and the influences that produce, and has guaranteed the stable operation of this EGR valve.

As another kind of preferred version of the present invention,, also be provided with the position transducer 30 of the opening degree of monitoring valve on the described valve body 20 like Fig. 1,2, shown in 5.

Further, the flexible tappet 31 in the upper-end surface of described chute 52 and the position transducer 30 leans, and chute 52 knee-actions make flexible tappet 31 produce upper and lower displacement.Described position transducer 30 can accurately be measured the displacement amount that closes valve device 50 through flexible tappet 31, and obtains the aperture size of valve through the assembly of sensor internal, thereby has realized the accurate control to valve opening.

Further; Described chute 52 is sleeve shape; The length direction of the middle part slotted eye 521 of chute 52 and the medial axis of valve rod 52 are perpendicular, and the external diameter of the rotary motion trace of the length of described slotted eye 521 and cantilever 41 matches, and the external diameter of the width of slotted eye 521 and cantilever 41 matches.

The said structure form of chute 52 is simply and comparatively compact, helps the good fit of chute 52 and cantilever 41, thereby helps realizing that 40 pairs of eccentric cams close the accurate control of valve device 50.

Below in conjunction with accompanying drawing movement process of the present invention is made comparatively detailed explanation:

Like Fig. 1, shown in 2, the rotating shaft of stepper motor 10 is fixedly connected with eccentric cam 40, and stepper motor 10 can accurately be controlled the angle of swing of eccentric cam 40, is confirmed the opening degree and the accurate positioning of EGR valve by the molded lines of eccentric cam 40; The cantilever 41 of described eccentric cam 40 is set in the chute 52 that closes valve device 50; Cantilever 41 slides in chute 8 and the valve rod 51 that promotes to close valve device 50 is done vertical motion, and the valve seat 53 that closes valve device 50 bottoms is arranged on the opening and closing of the inlet of valve body 20 with control valve body 20; Described position transducer 30 is integrated in the top of valve body 20; The displacement of position transducer 30 through flexible tappet 31 is to confirm to close the straight-line displacement amount of valve device 50; And then obtain the opening degree of EGR valve; The flexible tappet 31 of described position transducer 30 keeps in touch with the upper-end surface of chute 52 all the time, thereby can accurately respond to the position of EGR; Be arranged with Returnning spring 54 on the described valve rod 51 that closes valve device 50, thereby make EGR valve return in time.

During the EGR opening of valves: stepper motor 10 rotates to drive eccentric cam 40 rotations; The cantilever 41 of eccentric cam 40 is connected with the chute that closes valve device 50 52; Described chute 52 is fixedly connected with valve rod 51; So just, the rotation through eccentric cam 40 makes that closing valve device 50 produces upper and lower displacement, thereby can control the opening degree of EGR valve.

When the EGR valve cut out: door closer 50 is returning quickly under the effect of stepper motor 10 and Returnning spring 54.

The present invention confirms the aperture of EGR valve according to the operating mode of motor, and rotates through ECU control step motor 10 and to make the EGR valve reach needed aperture, thereby guarantees the needed EGR amount of engine operating condition; When motor was in outage state, ECU control step motor 10 rotated to drive eccentric cam 40 rotations, makes EGR valve appropriateness open, thereby can prevent the bonding of valve.

Claims

1. valve that is used for gas recirculation system; Comprise motor (10) and valve body (20); It is characterized in that: the rotating shaft of described motor (10) drives the eccentric cam mechanism action that is arranged in the valve body (20), and described eccentric cam mechanism makes valve be in and opens or close two states; Described eccentric cam mechanism comprises eccentric cam (40) and closes valve device (50), and eccentric cam (40) fixed cover is located in the rotating shaft of stepper motor (10), and eccentric cam (40) drives under the effect of rotating shaft and closes valve device (50) action to open or cut-off valve; A side that deviates from machine shaft of described eccentric cam (40) is provided with outward extending cantilever (41); The described valve device (50) that closes comprises valve rod (51), and the top of valve rod (51) is provided with described cantilever (41) is set in chute (52) wherein, and the bottom of valve rod (51) is provided with the valve seat (53) of import or export that can closed valve (20); Described cantilever (41) makes under the effect of eccentric cam (40) and closes valve device (50) and move up and down to open or cut-off valve.

2. the valve that is used for gas recirculation system according to claim 1 is characterized in that: the position transducer (30) that also is provided with the opening degree of monitoring valve on the described valve body (20).

3. the valve that is used for gas recirculation system according to claim 1 is characterized in that: be arranged with Returnning spring (54) on the described valve rod (51), an end of Returnning spring (54) is resisted against the lower end surface of chute (52), and the other end is fixed on the valve body (20).

4. the valve that is used for gas recirculation system according to claim 1 is characterized in that: described valve seat (53) is enclosed in the inlet of valve body (20).

5. the valve that is used for gas recirculation system according to claim 2; It is characterized in that: the flexible tappet (31) in the upper-end surface of described chute (52) and the position transducer (30) leans, and chute (52) knee-action makes flexible tappet (31) produce upper and lower displacement.

6. according to each described valve that is used for gas recirculation system of claim 1～5; It is characterized in that: described chute (52) is sleeve shape; The length direction of the middle part slotted eye (521) of chute (52) and the medial axis of valve rod (52) are perpendicular; The external diameter of the rotary motion trace of the length of described slotted eye (521) and cantilever (41) matches, and the external diameter of the width of slotted eye (521) and cantilever (41) matches.