WO2017018678A1

WO2017018678A1 - Wastegate valve actuator assembly

Info

Publication number: WO2017018678A1
Application number: PCT/KR2016/007229
Authority: WO
Inventors: 박석률; 변병준; 정하윤; 김영환
Original assignee: 캄텍주식회사
Priority date: 2015-07-27
Filing date: 2016-07-05
Publication date: 2017-02-02
Also published as: KR20170013122A

Abstract

The present invention relates to a wastegate actuator assembly which is capable of reducing noise generated by movement of a connecting rod assembly connected to a wastegate valve during a cold start or when driving. To this end, the present invention provides a wastegate valve actuator assembly comprising: a connection bracket which is mounted on an output shaft of a wastegate valve actuator; an extension shaft which is provided on the connection bracket and extends in one direction; a connecting rod assembly which has one end rotatably mounted on the extension shaft and the other end connected to a wastegate valve; a fixing member, installed at an end of the extension shaft, for preventing the connecting rod assembly from being separated from the extension shaft; and a buffer member which is disposed on the extension shaft, in at least one region between the other end of the connecting rod assembly and the bracket or between the other end of the connecting rod assembly and the fixing member, to prevent contact or collision between the connecting rod assembly and the bracket or the fixing member.

Description

Waste Gate Valve Actuator Assembly

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste gate actuator assembly, and more particularly to an invention capable of reducing noise generated by movement of a connecting rod assembly connected to a waste gate valve during cold start or driving.

A vehicle turbocharger is a device in which a turbine and a compressor are interconnected so that when the exhaust gas from the engine rotates, the compressor disposed in the intake manifold rotates to supply high-pressure air to the engine.

To this end, the turbine and the compressor are connected to one rotary shaft, but the space where the turbine is installed and the space where the compressor is installed are separated from each other.

On the other hand, it is necessary to bypass the exhaust gas in order to protect the turbine when no air charging is required or the pressure of the exhaust gas is excessive, and a part that selectively opens and closes the bypass flow path (waste gate) is called a waste gate valve. do.

The waste gate valve is connected to the waste gate valve actuator by a connecting rod assembly.

By bypassing the operation of the waste gate valve connected to the ECU, the bypass flow path can be opened or closed to adjust the rpm of the turbine and compressor.

The connecting rod assembly is connected to the extension shaft of the bracket provided in the waste gate valve actuator, and the connecting rod assembly is disposed with a clearance with respect to the extension shaft in order to ensure freedom of operation and installation.

However, since the exhaust gas exerts a pressure on the waste gate valve during cold start or during running, the connecting rod assembly connected to the valve vibrates in the left and right directions (or up and down) while being installed on the extension shaft, thereby contacting the bracket. There was a problem that noise caused by the collision caused discomfort during driving.

An object of the present invention is to provide a waste gate valve actuator assembly capable of preventing noise caused by vibration of the connecting rod assembly during vehicle operation.

The present invention for achieving this object, and the connection bracket is mounted to the output shaft of the waste gate valve actuator; An extension shaft provided in the connection bracket and extending in one direction; A connecting rod assembly having one end rotatably mounted to the extension shaft, the other end of which is connected to the waste gate valve side, and a fixing member installed at the end of the extension shaft to prevent the connecting rod assembly from being separated from the extension shaft; And disposed in the extension shaft and provided in at least one of the area between the other end of the connection rod assembly and the bracket or between the other end of the connection rod assembly and the fixing member. A waste gate valve actuator assembly is provided that includes a cushioning member to prevent contact or collision.

The connecting rod assembly includes a connecting rod, a connecting housing connecting the connecting rod and the extension shaft, and a bearing rotatably provided in the connecting housing and inserted into the extension shaft, wherein the shock absorbing member includes the connecting housing and the connecting bracket. It is characterized in that it is provided to elastically support at least one of the area between or between the connection housing and the fixing member.

A bearing accommodating part is provided in the connection housing to accommodate the bearing, wherein the shock absorbing member includes at least one of a support washer for supporting the bearing accommodating part, between the support washer and the connection bracket, or between the support washer and the fixing member. It characterized in that it comprises an elastic member provided in the region.

The support washer; A through hole through which the extension shaft passes, a stepped portion formed around the through hole, the support portion having a predetermined area and in contact with the bearing accommodation portion, and extending from the edge of the through hole toward the elastic member to be inserted into the elastic member It is characterized in that it comprises an extension rib.

The elastic member is characterized by consisting of a coil spring.

The buffer member is inserted into the extension shaft, characterized in that it comprises a coil spring provided between the other end of the connecting rod assembly and the bracket.

The shock absorbing member further comprises a support washer provided between the coil spring and the other end of the connecting rod assembly.

The support washer and the support portion for supporting in contact with the other end of the connecting rod assembly; A through hole through which the extension shaft passes; And extending ribs extending in one direction from an edge of the through hole and inserted into the coil spring.

According to the present invention, it is possible to prevent the connecting rod assembly from colliding with or contacting the connecting bracket or the fixing member due to the vibration of the connecting rod assembly, thereby preventing the collision noise or the contact noise.

Since the shock absorbing member is composed of a support washer and an elastic member in the form of a coil spring, there is an advantage in that it is possible to stably support the connecting rod assembly and to elastically support the connecting rod assembly and the connecting bracket or the fixing member.

And since the support part provided in the support washer does not support a bearing but supports the bearing accommodating part around it, a bearing can move smoothly.

An extension rib is formed in the support washer, and since the extension rib is inserted into the elastic member, a stable seating relationship is formed between the support washer and the elastic member, thereby achieving stability of the arrangement.

1 is a schematic diagram of a turbocharger assembly to which a waste gate valve actuator assembly according to the present invention is applied.

2 and 3 are perspective views of the turbocharger assembly to which the waste gate valve actuator assembly according to the present invention is applied.

4 is an enlarged perspective view of the waste gate valve and the bypass flow path.

5 and 6 are exploded perspective views of the waste gate valve actuator assembly according to the present invention.

7 is an exploded perspective view of the second connecting housing constituting the waste gate valve actuator assembly and the shock absorbing member according to the present invention;

8 is an enlarged perspective view of a state in which a shock absorbing member is installed in a waste gate valve actuator assembly according to the present invention;

FIG. 9 is a comparison graph showing a noise state in the vicinity of the turbocharger assembly before and after installing the shock absorbing member in the waste gate valve actuator assembly according to the present invention. FIG.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the present embodiments merely make the disclosure of the present invention complete, and are common in the art to which the present invention pertains. It is provided to fully inform those skilled in the art of the scope of the invention, which is to be defined only by the scope of the claims.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" and / or "comprising" does not exclude the presence or addition of components other than the mentioned components.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to describe the present invention in more detail.

As shown in FIG. 1, a waste gate valve actuator (hereinafter referred to as an “actuator”) 100 according to the present invention is mounted to a turbocharger housing 1.

The turbocharger housing includes a fresh air flow path housing 2 for supplying fresh air, an exhaust gas flow path housing 4 through which exhaust gas flows, the fresh air flow path housing 2 and the exhaust gas flow path housing 4. And a turbine assembly 3 respectively provided.

The turbine assembly 3 includes an exhaust gas turbine 3a rotatably provided inside the exhaust gas flow path housing 4 and a novel air supply turbine 3b rotatably provided in the new air flow path housing 2. And a connecting shaft 3c connecting the exhaust gas turbine 3a and the fresh air supply turbine 3b.

The new air passage housing 2 is provided with an inlet 2a and an outlet 2b, and the new air supply turbine 3b is provided between the inlet 2a and the outlet 2b.

On the other hand, the inlet 4a and the outlet 4b are also provided in the exhaust gas flow path housing 4, and the main flow path forming a space in which the exhaust gas turbine 3a is installed in the exhaust gas flow path housing 4. 4d and a bypass passage 4d partitioned with the main passage 4c are provided.

The waste passage 4d is provided with the waste gate valve (hereinafter referred to as a 'valve') 5 to selectively open and close the bypass passage 4d.

When the exhaust gas flows into the inlet 4a of the exhaust gas flow passage housing 4, the exhaust gas turbine 3a is rotated through the main flow passage 4c, and thus the fresh air supply turbine 3b is also rotated. Rotate

By the rotation of the fresh air supply turbine 3b, the fresh air flows in from the inlet port 2a of the new air flow channel housing 2 and is discharged to the discharge port 2b via the fresh air supply turbine 3b.

On the other hand, when the exhaust gas flows into the exhaust gas flow path housing 4, the pressure of the exhaust gas pressurizes the valve 5, and the direction of the pressing force is directed toward the opening direction of the valve 5.

Therefore, in order to maintain the bypass flow path 4d in a closed state, the valve 5 must be kept in a continuous closed state. Therefore, resistance must be provided in the direction opposite to the direction of the pressure exerted by the exhaust gas.

This resistance is provided by the actuator 100 connected to the connecting rod assembly 200 which is coupled with the valve 5.

The actuator 100 is driven by an electric actuator 100 that is driven by receiving power from the outside, not pneumatically, and the valve 5 remains closed in a low load region (approximately 1600 RPM or less) having a low RPM of the engine. Force on the valve 5 so as to.

In addition, in the high load region (approximately 1600 RPM or more) where the RPM of the engine is high, the force provided to the valve 5 is reduced to keep the valve 5 open.

This is to guide a part of the exhaust gas to the bypass passage 4d because the exhaust gas increases in the high load region.

As the exhaust gas increases, the pressure increases accordingly, and the rotation speed of the exhaust gas turbine 3a increases, and accordingly, the rotation speed of the fresh air turbine 3b also increases, thereby increasing supply of fresh air.

If the supply of fresh air is too large, the air-fuel ratio is excessively increased. In order to prevent such a problem, the opening and closing state of the valve 5 is adjusted to allow the exhaust gas to pass through the bypass passage 4d.

As shown in Fig. 2 and Fig. 3, the actuator 100 is fixed to the outside of the novel flow path housing with a bolt or the like, and the valve 5 opens and closes the bypass flow path 4c inside the exhaust flow path housing 4. It is mounted to the inside of the exhaust flow path housing 4 so as to be rotatable.

The valve 5 rotates about the rotation shaft 5a, the connection shaft 6 is provided on the rotation shaft 5a, and the connection plate 6 is connected to one end of the connection rod assembly 200.

The other end of the connecting rod assembly 200 is rotatably connected to the actuator 100.

Accordingly, the connecting rod assembly 200 is pulled or pushed by the operation of the actuator 100, whereby the valve 5 can open or close the bypass flow passage 4d.

The connecting rod assembly 200 and the actuator 100 may be collectively defined as a waste gate valve actuator assembly.

Looking at the configuration of the connecting rod assembly 200, the first connection is rotatably coupled to the connecting rod 201 and the connecting plate 6, which is screwed to one end of the connecting rod 201 and connected to the valve 5 And housing 210.

In addition, the second connection housing 220 which is screwed to the other end of the connecting rod 201 and connected to the extension shaft 120 extending from the bracket 110 connected to the actuator 100 is also connected to the connecting rod assembly 200. Included in

As shown in Fig. 3, when the connecting rod assembly 200 operates in the A direction, the valve 5 opens the outlet of the bypass flow passage 4c as shown in Fig. 4, and the bypass flow passage 4c opens. As a result, a part of the exhaust gas moves on the bypass flow passage 4c.

This can lower the rpm of the turbine.

On the other hand, when the connecting rod assembly 200 moves in the direction of the actuator 100 as in the B direction, the valve 5 closes the bypass flow passage 4c and the bypass flow passage 4c is closed.

This may increase the rpm of the turbine since all exhaust gas must pass through the turbine.

5 and 6 show a coupling structure between the connecting rod assembly 200 and the actuator 100.

The actuator 100 is provided with a motor (not shown) and a power transmission unit (not shown) composed of a plurality of gears, which are housed in the actuator housing 101, and the power transmission unit and the motor are provided with a housing cover ( 102).

The rotating shaft 103 provided in the power transmission unit penetrates through the housing cover 102 and protrudes outward.

The rotating shaft 103 is coupled to the connecting bracket 110.

Accordingly, the rotational force transmission is performed between the motor, the power transmission unit, the rotation shaft 103, and the connection bracket 110.

An extension shaft 111 is provided on the connection bracket 110 to extend from the surface thereof.

Extension shaft 111 is fixed to the connection bracket 110 in the same manner as welding or bolting.

The stepped portion is provided on the extension shaft 111 for stable placement, and the stepped portion is seated on the surface of the connection bracket 110.

On the extension shaft 111, a second connection housing 220 constituting the other end of the connection rod assembly 200, a shock absorbing member 300, and a fixing member 350 to be described later are disposed.

In the arrangement order, it is preferable that the buffer member 300 is first inserted into the extension shaft 111, and then the second connection housing 220 and finally the fixing member 350 are disposed.

A thread is formed at the end of the extension shaft 111, and the fixing member 350 is preferably a nut fastened thereto.

The bearing 230 is disposed in the second connection housing 220, and a bearing accommodation portion 222 is formed therein for a bearing accommodation space.

A through hole through which the extension shaft 111 penetrates is formed in the bearing 230, and an outer circumferential surface of the bearing is formed in a curved shape so as to rotate with respect to the bearing installation space.

This structure is specifically shown in FIG.

On the other hand, the buffer member 300 includes a support washer 310 and the elastic member 320 in the form of a coil spring. The support washer 310 is disposed between the second connection housing 220 and the elastic member 320, and the elastic member 320 is disposed between the support washer 310 and the bracket 110.

Since there was a space between the second connecting housing 220 and the connecting bracket 110 in the prior art, the second connecting housing 220 is moved between the fixing member 350 and the connecting bracket 102, thereby colliding with and contacting them. It produced noise.

The only reason for such clearance is that the connection point of the actuator 100 and the second connection housing 220 and the connection point of the valve 5 and the first connection housing 210 are not horizontally arranged with each other. Since the connecting rod assembly 200 has to be inclined accordingly, the second connecting housing 220 is left and right with respect to the extension shaft 111 during the opening and closing operation of the valve 5 of the actuator 100. Because it was forced to move slightly.

When the shock absorbing member 300 is disposed in the free space, and an object whose shape can be changed is disposed, the other end of the connection rod assembly 200 (second connection housing 220) extends when the actuator 100 operates. When the actuator 100 does not operate while being able to move from side to side on the shaft 111, the shock absorbing member 300 fills between the other end of the connecting rod assembly 200 and the bracket 110 and vibrates or rattles. ) Noise can be prevented.

Although the shock absorbing member 300 is disposed between the bracket 110 and the second connection housing 220 in the drawing, the shock absorbing member 300 may be disposed between the second connection housing 220 and the fixing member 350. to be.

Alternatively, the shock absorbing member 300 may be installed in two regions at the same time.

As shown in FIG. 7, the second connection housing 220 has a thread formed therein, and a connection end 221 which is screwed with the other end of the connection rod (see FIG. 5, 201), and is connected to the connection end. And a bearing accommodating part 222 having a bearing accommodating space in which the bearing 230 is accommodated, and a bearing 230 accommodating the bearing accommodating part 222.

On the other hand, the support washer 310 constituting the shock absorbing member 300 is provided to have a predetermined area at the edge of the through hole 311 and the through hole 311 through which the extension shaft passes and is supported in contact with the edge of the bearing accommodation space. The support 312 and an extension rib 313 is inserted into the elastic member 320 is formed in the coil spring extending in the opposite direction of the support 312 at the edge of the through hole 311.

Here, the outer diameter of the extension rib 313 is preferably smaller than the outer diameter of the support 312, whereby the outer profile of the support washer 310 is preferably in the form of stepped in the 'b' shape.

The support part 312 is supported by the outer part (the bearing accommodation part 222) instead of contacting the bearing, and the bearing 230 can move freely in the bearing accommodation space.

In addition, since the extension rib 313 is provided in a short tube shape and is inserted into the elastic member 320 formed of the coil spring, an insertion connection relationship may be formed between the elastic member 320 and the support washer 310. .

8 is a partially enlarged view showing a state where the buffer structure is installed.

As shown in FIG. 8, the shock absorbing structure 300 may be compressed and disposed between the second connection housing 220 and the connection bracket 110.

In particular, since the elastic member 320 is compressed, the elastic member 320 is elastically deformed even if the size of the space between the second connection housing 220 and the connection bracket 110 is changed, and the vehicle is operated (when cold starting or driving). Even when the two connecting housings 220 are shaken, movement on the extension shaft 111 is restricted.

In this state, since the shock absorbing member 300 pushes the second connection housing 220 in the direction of the fixing member 350, there is no free space between the fixing member 350 and the second connection housing 220.

Therefore, vibration or contact caused by the movement of the second connection housing 220 is prevented.

Hereinafter, the operation of the present invention will be described.

As shown in Figs. 1 and 2, when the exhaust gas is discharged while the valve 5 blocks the bypass flow passage 4c, the exhaust gas pressurizes the valve 5, whereby the valve 5 Vibrations occur.

The vibration is transmitted to the connection rod assembly 200 so that the connection rod assembly 200 also vibrates, and the second connection housing 220 of the connection rod assembly 200 vibrates finely on the extension shaft 111.

In the absence of the shock absorbing member 300 according to the present invention, the second connection housing 220 moves on the extension shaft 111, thereby causing continuous collision sounds to come into contact with the fixing member 350 or the connection bracket 110.

However, since the shock absorbing member 300 is provided between the second connection housing 220 and the connection bracket 110 and elastically supports them, the second connection housing 220 is prevented from vibrating, thereby vibrating. Rattle noise due to this can be prevented.

Meanwhile, as shown in FIG. 7, the bearing washer 310 supports the bearing washer 222, not the support washer 310 of the shock absorbing member 300, but the bearing washer 222. You can move freely without getting caught).

In addition, since the extension rib 313 of the support washer 310 is inserted into the coil spring-type elastic member 320, the mutual seating relationship between the elastic member 320 and the extension rib 313 can be more stably maintained. There is also.

Thus, when comparing the operation noise in the vicinity of the turbocharger in the installed state and before installing the shock absorbing member 300, as shown in Figure 9, 27.5 dB was measured before installation, but after installation 22.5 dB The noise reduction effect of about 18% can be realized.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but it is only for the purpose of describing the present invention, and those skilled in the art to which the present invention pertains various modifications or equivalents from the detailed description of the invention. It will be appreciated that one embodiment is possible.

Therefore, the true scope of the present invention should be determined by the technical spirit of the claims.

Claims

A connection bracket mounted to an output shaft of the waste gate valve actuator;

An extension shaft provided in the connection bracket and extending in one direction;

A connecting rod assembly having one end rotatably mounted on the extension shaft and the other end connected to the waste gate valve side;

A fixing member installed at an end of the extension shaft to prevent the connecting rod assembly from being separated from the extension shaft;

Disposed on the extension shaft and provided in at least one of the area between the other end of the connection rod assembly and the bracket or between the other end of the connection rod assembly and the fixing member, the contact between the connection rod assembly and the bracket or the fixing member. Or a shock absorbing member for preventing a collision.
The method of claim 1,

The connecting rod assembly includes a connecting rod, a connecting housing connecting the connecting rod and the extension shaft, and a bearing rotatably provided in the connecting housing and inserted into the extension shaft.

And the buffer member is arranged to elastically support at least one of the area between the connection housing and the connection bracket or between the connection housing and the fixing member.
The method of claim 2,

A bearing receiving part provided in the connection housing to receive the bearing, wherein the buffer member includes a support washer supporting the bearing receiving part;

And an elastic member provided in at least one region between the support washer and the connection bracket or between the support washer and the fixing member.
The method of claim 3,

The support washer; A through hole through which the extended shaft passes,

A support part formed stepped around the through hole, the support part having a predetermined area and in contact with the bearing accommodation part;

And an extension rib extending in the direction of the elastic member from the edge of the through hole and inserted into the elastic member.
The method of claim 3,

And said elastic member is comprised of a coil spring.
The method of claim 1,

The buffer member is inserted into the extension shaft,

And a coil spring provided between the other end of the connecting rod assembly and the bracket.
The method of claim 6,

The buffer member further comprises a support washer provided between the coil spring and the other end of the connecting rod assembly.
The method of claim 6,

The support washer and the support portion for supporting in contact with the other end of the connecting rod assembly;

A through hole through which the extension shaft passes;

And an extending rib extending in one direction from an edge of the through hole and inserted into the coil spring.