CN211975157U

CN211975157U - Turbocharger and actuator thereof

Info

Publication number: CN211975157U
Application number: CN201922492046.0U
Authority: CN
Inventors: 杨豫魁; 张广西; 王新校; 郑志旺; 丁宏达
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-11-20
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a turbocharger and an actuator thereof, wherein the actuator of the turbocharger comprises a shell base body, a first elastic part, a second elastic part and a push rod for driving the first elastic part and the second elastic part to move, and a first end of the first elastic part and a first end of the second elastic part are both fixed relative to the push rod; when the actuator is in an assembly state, the second end of the first elastic piece is in a compression state in abutting connection with the shell base body, the second elastic piece naturally extends, and the length of the second elastic piece is smaller than that of the first elastic piece. In the turbocharger provided by the application, the first elastic piece and the second elastic piece are inserted at different moments, so that important performance influence parameters such as the opening moment of the waste gas bypass valve, the bypass characteristic, the maximum bypass amount and the like can be accurately and independently controlled, and the problems of low sensitivity of the high-stiffness spring, poor stability and poor reliability of the low-stiffness spring can be effectively avoided.

Description

Turbocharger and actuator thereof

Technical Field

The utility model relates to an internal-combustion engine technical field, in particular to turbo charger's executor. The utility model discloses still relate to a turbo charger including above-mentioned executor.

Background

The operating condition range of the engine is wide, the turbocharger not only ensures the power responsiveness of the engine in a low-speed area, but also ensures the operating safety under a high-speed operating condition, so that the turbocharger with the turbine waste gas bypass valve mechanism is generally adopted at present, the power responsiveness is ensured without bypassing waste gas at a low speed, and the operating safety is ensured by limiting the rotating speed to be too high by bypassing the waste gas at a high speed. Pneumatic actuators are the technical solutions that are currently in common use.

As shown in fig. 1, the conventional actuator includes a housing upper cover 01, a housing base 02, a rubber diaphragm 03, a push rod 04, and a spring 05. Spring 05 initial length L1, stiffness coefficient K1, precompression force F0;

in the actuator working process, when the push rod 4 extends outwards for a length L, the driving pressure F at the moment is as follows:

F＝F0+K1×L

since the actuator spring is set once during the design of the actuator, the opening time and the waste gas bypass characteristic of the turbocharger waste gas bypass valve are fixed. Considering the operation safety of the engine at high speed, when the energy of exhaust gas (exhaust gas) is excessive during high-speed operation of the engine, the rotating speed of the supercharger cannot exceed the allowable limit rotating speed, and at the moment, a waste gas bypass valve is needed to bypass the excessive exhaust gas to the turbine so as to ensure that the rotating speed of the supercharger is in a safe range. If the spring design of the actuator is not reasonable, the waste gas bypass valve is opened too early when the engine is at a medium-low rotating speed, the supercharging capacity is reduced, the power responsiveness of the engine is poor, and the reliability of the actuator is poor.

Therefore, how to improve the reliability of the actuator is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a turbo charger's executor, the reliability of this executor improves. Another object of the present invention is to provide a turbocharger including the above actuator.

In order to achieve the above object, the present invention provides an actuator of a turbocharger, including a housing base, a first elastic member, a second elastic member, and a push rod for driving the first elastic member and the second elastic member to move, wherein both a first end of the first elastic member and a first end of the second elastic member are fixed relative to the push rod;

when the actuator is in an assembly state, the second end of the first elastic piece is in a compression state in abutting connection with the shell base body, the second elastic piece naturally extends, and the length of the second elastic piece is smaller than that of the first elastic piece.

Preferably, the first elastic member is sleeved outside the second elastic member.

Preferably, the second elastic element is sleeved outside the push rod.

Preferably, the first elastic member and the second elastic member are both coil springs.

Preferably, the first elastic member and the second elastic member have different stiffness coefficients.

Preferably, the actuator further comprises a housing upper cover, the housing upper cover and the housing base body are buckled to form the actuator inner cavity, and the first elastic piece and the second elastic piece are both located in the inner cavity.

Preferably, the upper cover of the shell is provided with a vent hole which is opposite to the end part of the push rod.

Preferably, when the actuator is in an assembled state, the end part of the push rod blocks the air vent.

Preferably, still include the elastic diaphragm, the shell upper cover with the lock department of shell base member, one is equipped with the turn-ups, and the other is equipped with the draw-in groove that is used for the turn-ups of joint, the edge of elastic diaphragm is located in the draw-in groove, and the two sides that set up dorsad respectively with the turn-ups with the terminal surface butt of draw-in groove.

A turbocharger comprising an actuator as claimed in any one of the preceding claims.

In the above technical solution, the actuator of the turbocharger provided by the present invention includes a housing base, a first elastic member, a second elastic member, and a push rod for driving the first elastic member and the second elastic member to move, wherein a first end of the first elastic member and a first end of the second elastic member are both fixed relative to the push rod; when the actuator is in an assembly state, the second end of the first elastic piece is in a compression state in abutting connection with the shell base body, the second elastic piece naturally extends, and the length of the second elastic piece is smaller than that of the first elastic piece. When the actuator is in an assembly state, the second elastic piece is in a natural state, the first elastic piece is in a compression state, and when the push rod continuously extends outwards, the first elastic piece is driven by the push rod to be compressed continuously; when the push rod is compressed to a certain degree, the second elastic piece is abutted against the shell, and when the push rod extends outwards, the second elastic piece is compressed.

As can be seen from the above description, in the turbocharger provided by the present application, the first elastic member and the second elastic member are interposed at different times, so that important performance influencing parameters such as the opening time of the wastegate valve, the bypass characteristic, the maximum bypass amount, and the like can be accurately and independently controlled, and the problems of low sensitivity of the high-stiffness spring, poor stability and poor reliability of the low-stiffness spring can be effectively avoided, so that the reliability of the actuator provided by the present application is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a conventional actuator;

fig. 2 is a schematic structural diagram of an actuator according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a turbocharger according to an embodiment of the present invention;

fig. 4 is a pressure characteristic comparison diagram of a conventional actuator and an actuator according to the present invention.

Wherein in FIGS. 1-3:

01-upper cover of shell, 02-base of shell, 03-elastic diaphragm, 04-push rod, 05-spring;

1-upper cover of the casing, 2-base of the casing, 3-elastic membrane, 4-push rod, 5-first elastic piece, 6-second elastic piece, A1-actuator, A2-actuator support, A3-bypass valve component.

Detailed Description

The core of the utility model is to provide a turbo charger's executor, the reliability of this executor improves. The utility model discloses another core provides a turbo charger including above-mentioned executor.

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Please refer to fig. 1 to fig. 4.

In one embodiment, the actuator of the turbocharger provided by the embodiment of the present invention includes a housing base 2, a first elastic member 5, a second elastic member 6, and a push rod 4 for driving the first elastic member 5 and the second elastic member 6 to move, wherein both the first end of the first elastic member 5 and the first end of the second elastic member 6 are fixed relative to the push rod 4; when the actuator a1 is in the assembled state, the second end of the first elastic member 5 abuts against the housing base 2 to be in a compressed state, the second elastic member 6 naturally extends, and the length of the second elastic member 6 is smaller than that of the first elastic member 5. Of course, the number of the first elastic members 5 and the second elastic members 6 may be one or at least two in the actual assembling process.

Specifically, the first elastic element 5 and the second elastic element 6 may be arranged in parallel, the first elastic element 5 is sleeved outside the second elastic element 6, or the second elastic element 6 is sleeved outside the first elastic element 5, and since the first elastic element 5 is always in a compressed state, preferably, the first elastic element 5 is sleeved outside the second elastic element 6.

When the actuator A1 is in the assembled state, the second elastic part 6 is in the natural state, the first elastic part 5 is in the compressed state, and when the push rod 4 continuously extends outwards, the first elastic part 5 is driven by the push rod 4 to be compressed continuously; when compressed to a certain extent, the second elastic member 6 abuts against the housing, and when the push rod 4 is then extended outward, the second elastic member 6 is compressed.

In order to guide the movement of the first elastic element 5 and the second elastic element 6, preferably, the second elastic element 6 is sleeved outside the push rod 4.

Specifically, the first elastic member 5 and the second elastic member 6 are both coil springs. Because the spiral spring is of a conventional structure, the actuator A1 can be directly purchased in the market and is convenient to install, and the production efficiency of the actuator A1 is improved.

Specifically, the stiffness coefficients of the first elastic member 5 and the second elastic member 6 are the same, and of course, the stiffness coefficients of the first elastic member 5 and the second elastic member 6 may be different, specifically, the stiffness coefficient of the first elastic member 5 is greater than that of the second elastic member 6, or the stiffness coefficient of the first elastic member 5 is smaller than that of the second elastic member 6.

As can be seen from the above description, in the turbocharger provided in the embodiment of the present application, by interposing the first elastic member 5 and the second elastic member 6 at different times, important performance-affecting parameters such as the opening time of the wastegate valve, the bypass characteristic, the maximum bypass amount, and the like can be accurately and independently controlled, and the problems of low sensitivity of the high-stiffness spring, poor stability and poor reliability of the low-stiffness spring can be effectively avoided, so that the reliability of the actuator provided by the present application is improved.

The actuator control is more accurate and flexible, and important performance influence parameters such as opening time, bypass characteristics and the maximum exhaust gas bypass quantity of the exhaust gas bypass valve of the turbocharger can be respectively controlled through designing different combinations of the first elastic piece 5 and the second elastic piece 6 and through intervention of different springs.

As shown in fig. 2, on the basis of the above solutions, the actuator of the turbocharger further includes a housing upper cover 1, the housing upper cover 1 and the housing base 2 are fastened to form an actuator cavity, and the first elastic element 5 and the second elastic element 6 are both located in the cavity. In particular, the housing cover 1 can be connected to the housing base 2 in a sealing manner by means of threaded fasteners.

In one embodiment, the housing cover 1 is provided with a vent opening opposite to the end of the push rod 4. Of course, the push rod 4 may also be arranged offset with respect to the vent.

Preferably, when the actuator is in the assembled state, the end of the push rod 4 blocks the vent. And external impurities are prevented from entering the cavity through the vent.

In one embodiment, the actuator of the turbocharger further comprises an elastic diaphragm 3, and in particular, the elastic diaphragm 3 may be a rubber diaphragm. The lock department of shell upper cover 1 and housing base member 2, one is equipped with the turn-ups, and the other is equipped with the draw-in groove that is used for the turn-ups of joint, and the edge of elastic diaphragm 3 is located the draw-in groove, and the both sides that set up dorsad respectively with the terminal surface butt of turn-ups and draw-in groove.

Specifically, the housing upper cover 1 and the housing base 2 are metal members, preferably, metal plate structures.

In the working process, along with the gradual increase of the driving pressure, the rubber diaphragm is gradually extended outwards by the air pressure driving push rod 4, the first elastic part 5 is compressed, and the second elastic part 6 is gradually changed from a free state to a compressed state. At this time, the stiffness characteristic of the entire actuator changes.

The initial state length L1, the rigidity coefficient K1 and the pre-compression force F0 of the first elastic piece 5;

the free length L2 and the rigidity coefficient K2 of the second elastic element 6;

1) when 0 ≦ L < (L1-L2), the driving force F ═ F0+ K1 × L;

2) when (L1-L2) ≦ L, the driving force F ═ F0+ K1 × L + K2 × (L-L0).

The actuator stroke-pressure characteristic is shown in fig. 4 below.

The turbocharger provided by the application comprises an actuator A1, an actuator support A2 and a bypass valve assembly A3, wherein the actuator A1 is any one of the actuators A1. While the specific structure of the actuator a1 has been described above, the present application includes the actuator a1, which also has the technical effects described above.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An actuator of a turbocharger is characterized by comprising a housing base body (2), a first elastic piece (5), a second elastic piece (6) and a push rod (4) driving the first elastic piece (5) and the second elastic piece (6) to move, wherein a first end of the first elastic piece (5) and a first end of the second elastic piece (6) are both fixed relative to the push rod (4);

when the actuator is in an assembly state, the second end of the first elastic piece (5) is in a compression state in contact with the shell base body (2), the second elastic piece (6) naturally extends, and the length of the second elastic piece (6) is smaller than that of the first elastic piece (5).

2. The actuator of a turbocharger according to claim 1, wherein the first resilient member (5) is sleeved outside the second resilient member (6).

3. The actuator of a turbocharger according to claim 2, wherein the second elastic member (6) is sleeved outside the push rod (4).

4. Actuator of a turbocharger according to claim 1, characterized in that the first (5) and the second (6) elastic member are both helical springs.

5. Actuator of a turbocharger according to claim 1, characterized in that the first spring (5) and the second spring (6) have different stiffness coefficients.

6. The actuator of a turbocharger according to any one of claims 1-5, further comprising a housing upper cover (1), wherein the housing upper cover (1) is fastened with the housing base body (2) to form the actuator inner cavity, and the first elastic member (5) and the second elastic member (6) are both located in the inner cavity.

7. The actuator of the turbocharger as claimed in claim 6, characterized in that the housing cover (1) is provided with a vent opening facing the end of the tappet (4).

8. The actuator of a turbocharger according to claim 7, characterized in that the end of the push rod (4) closes off the air opening when the actuator is in the assembled state.

9. The actuator of the turbocharger according to claim 6, further comprising an elastic diaphragm (3), wherein a flange is arranged at a buckling position of the housing upper cover (1) and the housing base body (2), a clamping groove for clamping the flange is arranged on the other one, an edge of the elastic diaphragm (3) is located in the clamping groove, and two surfaces which are arranged oppositely abut against end surfaces of the flange and the clamping groove respectively.

10. A turbocharger comprising an actuator (a1), wherein the actuator (a1) is the actuator (a1) of any one of claims 1 to 9.