CN111997740A

CN111997740A - Actuator for variable turbine geometry turbocharger

Info

Publication number: CN111997740A
Application number: CN202010733813.7A
Authority: CN
Inventors: 过于成; 赵志球; 林峰; 李文祥; 王成; 宋士磊; 周进
Original assignee: United Automotive Electronic Systems Co Ltd
Current assignee: United Automotive Electronic Systems Co Ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2020-11-27

Abstract

The invention provides an actuator for a variable turbine geometry turbocharger. The actuator comprises a shell, a motor and a speed change assembly, wherein the shell is provided with a first cavity and a second cavity which are sequentially arranged along the axial direction, and the first cavity is communicated with the second cavity through a first communication hole; the motor is arranged in the first cavity, and an output shaft of the motor penetrates through the first communication hole to enter the second cavity; the speed change assembly is arranged in the second cavity, the input end of the speed change assembly is coupled with the output shaft of the motor, and the output end of the speed change assembly penetrates out of the shell and is used for being connected with a guide vane of the turbocharger with the variable turbine geometry. By the arrangement, the actuator can change the adjusting characteristic curve at will, and the special requirements of different users on the variable turbine geometry turbocharger characteristic curve under different working conditions are met.

Description

Actuator for variable turbine geometry turbocharger

Technical Field

The invention relates to the technical field of automobile engine turbocharging, in particular to an actuator for a variable turbine geometry turbocharger.

Background

The variable turbine geometry turbocharging technology is designed by focusing on the requirement of the engine supercharging working condition, the efficiency and the flow characteristic of the turbine are changed by adjusting the angle of the guide vane, so that the supercharger and the engine keep a good matching relation in a wider working condition range, the matching performance gives consideration to the requirements of high and low working conditions on the dynamic property and the economical property of the engine, and simultaneously, the exhaust gas energy is better utilized.

In the existing variable turbine geometry turbocharger, the actuator for adjusting the angle of the guide vane is mostly a pneumatic actuator with a spring element. The actuator has the problem that the adjustment characteristic curve is single, and the special requirements of different users under different working conditions on the characteristic curve of the variable turbine geometry turbocharger cannot be met simultaneously.

Disclosure of Invention

The invention aims to provide an actuator for a variable turbine geometry turbocharger, and aims to solve the problem that a pneumatic actuator of the variable turbine geometry turbocharger is single in adjusting characteristic curve and cannot meet special requirements of different working conditions and different users on the characteristic curve of the variable turbine geometry turbocharger at the same time.

In order to solve the above technical problem, the present invention provides an actuator for a variable turbine geometry turbocharger, comprising a housing, a motor and a transmission assembly, wherein,

the shell is provided with a first cavity and a second cavity which are sequentially arranged along the axial direction, and the first cavity is communicated with the second cavity through a first communication hole;

the motor is arranged in the first cavity, and an output shaft of the motor penetrates through the first communication hole to enter the second cavity;

the speed change assembly is arranged in the second cavity, the input end of the speed change assembly is coupled with the output shaft of the motor, and the output end of the speed change assembly penetrates out of the shell and is used for being connected with a guide vane of the turbocharger with the variable turbine geometry.

Optionally, the speed change assembly sequentially comprises a first gear, a second gear, a third gear, a fourth gear, a fifth gear and an output member from the input end to the output end;

the first gear is coupled with an output shaft of the motor; the second gear is coaxially and fixedly connected with the first gear, and the second gear is meshed with the third gear; the fourth gear is coaxially and fixedly connected with the third gear, and the fourth gear is meshed with the fifth gear; the output member is coaxially connected with the fifth gear.

Optionally, the fifth gear is a sector gear.

Optionally, a control assembly is further disposed in the second cavity, and the control assembly includes: a permanent magnet and a PCBA (Printed Circuit Board Assembly), wherein,

the permanent magnet is arranged at the end part, facing the first cavity, of the fifth gear and is fixedly connected with the fifth gear;

the second cavity with be provided with PCBA installation location base station on the adjacent terminal surface of first cavity, PCBA set up in on the PCBA installation location base station, PCBA includes at least one hall sensor.

Optionally, a sensor communication pin group is arranged in the PCBA mounting and positioning base station, and the sensor communication pin group and the hall sensor are connected through a flexible fisheye pin terminal in a press fit manner.

Optionally, the housing has a second communication hole, and the second communication hole is communicated with the second cavity and covered by a waterproof breathable film.

Optionally, the housing sequentially includes an end cover, an intermediate member, and a cover plate along a direction from the first cavity to the second cavity;

the end cover and the intermediate piece enclose to form the first cavity, the intermediate piece and the cover plate form the second cavity, and the end cover and the cover plate are respectively detachably connected with the intermediate piece.

Optionally, the intermediate piece includes a motor positioning surface and a forward-backward step, which are disposed in the first cavity, and the motor positioning surface is disposed on an end surface of the first cavity adjacent to the second cavity and is used for limiting axial displacement of the motor relative to the intermediate piece in a direction away from the end cover; the reversing step extends along the axial direction of the first cavity and is used for limiting the circumferential rotation of the motor relative to the intermediate piece.

Optionally, the intermediate piece is provided with a pressure loading groove towards the periphery of one end of the end cover, the end cover passes through the pressure loading groove and is connected with the intermediate piece, a wave spring and a gasket are sequentially arranged between the end cover and the motor, and the wave spring and the gasket are used for limiting the axial displacement of the motor towards the end cover relative to the intermediate piece.

Optionally, the intermediate member and the cover plate are connected by screws or bolts.

Optionally, the actuator further includes a radial sealing ring, and the radial sealing ring is disposed at a joint between the intermediate member and the cover plate.

Optionally, the intermediate member includes a set of mounting holes, and the housing has a set of mounting holes at a junction of the intermediate member and the cover plate, the set of mounting holes being circumferentially disposed on an outer periphery of the housing for connecting the variable turbine geometry turbocharger.

In order to solve the technical problem, the invention further provides a variable turbine geometry turbocharger, which is characterized by comprising the actuator and a guide vane, wherein the output end of the actuator is connected with the guide vane.

Compared with the prior art, the actuator provided by the invention comprises a shell, a motor and a speed change assembly. The motor is used as a power source to be decoupled with the air pressure in the supercharger, the output characteristic is optimized by the speed change assembly, the adjusting characteristic curve can be changed at will, and the special requirements of different users on the characteristic curve of the variable-turbine-geometry turbocharger under different working conditions are met.

Drawings

It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention. Wherein:

FIG. 1 is an exploded view of an actuator according to an embodiment of the present invention;

FIG. 2a is a perspective view of an intermediate member according to an embodiment of the invention;

FIG. 2b is a perspective view of an intermediate member in another orientation in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a needle assembly according to an embodiment of the present invention;

FIG. 4 is a perspective view of a shift assembly in accordance with one embodiment of the present invention;

FIG. 5 is an axial cross-sectional view of a fifth gear in accordance with an embodiment of the present invention;

fig. 6 is a perspective view of a cover plate according to an embodiment of the invention.

In the drawings:

100-a housing; 200-a motor; 300-a transmission assembly;

111-end cap; 112-middleware; 113-a cover plate; 114-an output aperture; 120-a first cavity; 130-a second cavity; 140-a wave spring; 150-a gasket; 160-a first via hole; 161-a second communication hole; 170-installing a pressure tank; 180-assembling hole groups; 190-mounting hole group;

210-motor positioning surface; 220-reversing steps;

311-motor output gear; 312 — a first gear; 313-a second gear; 314-third gear; 315-fourth gear; 316-fifth gear; 317-output member; 320-PCBA; 321-PCBA mounting and positioning base station; 322-a sensor communication pin set; 323-motor communication needle group; 324-a permanent magnet; 330-breathable film; 340-radial seal ring.

Detailed Description

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this application, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a" and "an" are generally employed in a sense including "at least one," the terms "at least two" are generally employed in a sense including "two or more," and the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or at least two of the features, "one end" and "the other end" and "proximal end" and "distal end" generally refer to the corresponding two parts, which include not only the end points, but also the terms "mounted", "connected" and "connected" should be understood broadly, e.g., as a fixed connection, as a detachable connection, or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Furthermore, as used in the present invention, the disposition of an element with another element generally only means that there is a connection, coupling, fit or driving relationship between the two elements, and the connection, coupling, fit or driving relationship between the two elements may be direct or indirect through intermediate elements, and cannot be understood as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation inside, outside, above, below or to one side of another element, unless the content clearly indicates otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention provides an actuator for a variable turbine geometry turbocharger, and aims to solve the problem that the actuator of the existing variable turbine geometry turbocharger has a single adjusting characteristic curve and cannot meet special requirements of different working conditions and different users on the characteristic curve of the variable turbine geometry turbocharger at the same time.

The following description refers to the accompanying drawings.

Referring to fig. 1 to 6, fig. 1 is an exploded view of an actuator according to an embodiment of the present invention; FIG. 2a is a perspective view of an intermediate member according to an embodiment of the invention; FIG. 2b is a perspective view of an intermediate member in another orientation in accordance with an embodiment of the present invention; FIG. 3 is a schematic view of a needle assembly according to an embodiment of the present invention; FIG. 4 is a perspective view of a shift assembly in accordance with one embodiment of the present invention; FIG. 5 is an axial cross-sectional view of a fifth gear in accordance with an embodiment of the present invention; fig. 6 is a perspective view of a cover plate according to an embodiment of the invention.

Fig. 1 shows an actuator applied to a variable turbine geometry turbocharger, which comprises a housing 100, an electric motor 200 and a speed change assembly 300, wherein the housing 100 is provided with a first cavity 120 and a second cavity 130 which are sequentially arranged along an axial direction, and the first cavity 120 is communicated with the second cavity 130 through a first communication hole 160; the motor 200 is disposed in the first cavity 120, and an output shaft of the motor 200 passes through the first communication hole 160 and enters the second cavity 130; the speed changing assembly 300 is disposed in the second cavity 130, an input end of the speed changing assembly 300 is coupled to an output shaft of the motor 200, and an output end of the speed changing assembly 300 penetrates through the housing 200 to connect with a guide vane of a variable turbine geometry turbocharger.

With such a configuration, the motor 200 is firstly used as a power source to be decoupled from the air pressure inside the supercharger, and the power and response characteristics of the actuator are not affected by the air pressure inside the supercharger. Meanwhile, the motor 200 is used as a power source, and the output characteristic is optimized by the speed change assembly, so that the actuator has the advantages of large torque, high control precision and quick response time. Therefore, the structure ensures that different adjusting characteristic curves can be realized from two aspects of freedom degree and dynamic characteristic, and different requirements of different users under different working conditions are met.

In an exemplary embodiment, referring to fig. 4, the speed changing assembly 300 includes a first gear 312, a second gear 313, a third gear 314, a fourth gear 315, a fifth gear 316 and an output member 317 in sequence from the input end to the output end; the first gear 312 is coupled to an output shaft of the motor 200, in an embodiment, a motor output gear 311 is disposed on the output shaft of the motor 200, and the first gear 312 is engaged with the motor output gear 311; the second gear 313 is coaxially and fixedly connected with the first gear 312, and the second gear 313 is in meshed connection with the third gear 314; the fourth gear 315 is coaxially and fixedly connected with the third gear 314, and the fourth gear 315 is in meshed connection with the fifth gear 316; referring to fig. 5, the output member 317 is coaxially connected to the fifth gear 316. Through such design, adopt multistage gear drive, the transmission system becomes compact distribution simultaneously, has realized little volume lightweight big drive ratio effect.

Preferably, the fifth gear 316 is a sector gear. Therefore, the space of the second cavity 130 can be further saved, the overall size of the actuator can be reduced, and the light weight effect can be enhanced.

Optionally, the housing 100, the first gear 312, the second gear 313, the third gear 314, the fourth gear 315, and the fifth gear 316 are all made of plastic. On the premise of ensuring the strength and the durability, the requirement of the modern automobile for developing lightweight design can be further met. It is understood that the above-described exemplary embodiment only shows the transmission assembly 300 using a gear set for transmission, and in practice, those skilled in the art can select transmission components such as a timing belt, a friction wheel, etc. to form the transmission assembly 300.

Preferably, referring to fig. 2a and 5, a control component is further disposed in the second cavity 130, and the control component includes a permanent magnet 324 and a PCBA320, where the permanent magnet 324 is disposed at an end of the fifth gear 316 facing the first cavity 120 and is fixedly connected to the fifth gear 316; the second cavity 130 with be provided with PCBA installation location base station 321 on the adjacent terminal surface of first cavity 120, PCBA320 set up in on the PCBA installation location base station 321, PCBA320 includes at least one hall sensor. Through the additionally arranged control assembly, the angle of the guide vane can be accurately controlled through the actuator, the response speed is high, and the optimal control effect is achieved; for example, the angle of the guide vane of the supercharger is adjusted at the initial stage of engine starting, the airflow speed passing through the vane is increased, the problem of the delay of the turbine is solved, and for example, the angle of the guide vane is kept constant under a certain working condition, so as to fix the inner volume of the turbine and the like. The control component can also feed back signals and can be used as judgment basis of other control units.

Preferably, referring to fig. 2a and 3, on the end surface of the second cavity 130 adjacent to the first cavity 120, there are pin assemblies, including a sensor communication pin set 322 and a motor communication pin set 323; the motor communication needle group 323 is connected with the motor 200; the PCBA mounting and positioning base 321 has a sensor communication pin group 323 therein, and the sensor communication pin group 323 and the hall sensor are connected in a press-fit manner through a flexible fisheye pin terminal. The connection mode can effectively improve the vibration resistance level of the product and reduce the damage to the PCB board in the assembly process.

Preferably, referring to fig. 2b, the housing 100 has a second communication hole 161, and the second communication hole 161 is communicated with the second cavity 130 and covered by a waterproof and breathable film 330. Adopt waterproof ventilated membrane structure balance second cavity 130 and external environment pressure differential, avoid the product because of the temperature impact, the damage of the unbalanced internal and external pressure to second cavity 130 internals has improved the life-span of product.

In an alternative embodiment, referring to fig. 1, the housing 100 includes an end cap 111, an intermediate member 112, and a cover plate 113 in sequence along the direction from the first cavity 120 to the second cavity 130; the end cap 111 and the middle piece 112 enclose the first cavity 120, the middle piece 112 and the cover plate 113 enclose the second cavity 130, and the end cap 111 and the cover plate 113 are detachably connected to the middle piece 112 respectively.

Further, referring to fig. 2b, the middle part 111 further includes a motor positioning surface 210 and a forward-backward step 220, which are disposed in the first cavity 120, wherein the motor positioning surface 210 is disposed on end surfaces of the first cavity 120 adjacent to the second cavity 130, and is used for limiting axial displacement of the motor 200 relative to the middle part 112 in a direction away from the end cover 111; the forward and backward step 220 extends axially along the first cavity 120, and is used for limiting the circumferential rotation of the motor 200 relative to the intermediate member 112, improving the rigidity of the intermediate member, and providing mechanical performance.

Further, referring to fig. 2a, a pressing groove 170 is disposed on an outer circumference of one end of the middle member 112 facing the end cover 111, and the end cover 111 is connected to the middle member 111 through the pressing groove 170, referring to fig. 1, a wave spring 140 and a gasket 150 are sequentially disposed between the end cover 111 and the motor 200, and the wave spring 140 and the gasket 150 are used for limiting axial displacement of the motor 200 relative to the middle member 112 in a direction facing the end cover 111. So configured, it is convenient to assemble the motor 200 into the first cavity 120, and the motor 200 can be axially limited by the end cap 111, the wave spring 140 and the gasket 150, so that the motor 200 can be reliably fixed in the first cavity 120.

Preferably, referring to fig. 2b and fig. 6, a circumferentially arranged set of assembly holes 180 is provided in each of the intermediate member 112 and the cover plate 113, and the intermediate member 112 and the cover plate 113 are connected by screws or bolts through the set of assembly holes 180. By means of the design, the assembly mode and the maintenance process of the actuator are optimized in a targeted mode, the production cost can be reduced, and meanwhile the dimensional accuracy of each key component is still guaranteed.

Preferably, referring to fig. 1, the actuator further includes a radial structure sealing ring 340, and the radial structure sealing ring 340 is disposed at a connection position of the intermediate member 112 and the cover plate 113. The radial structure sealing ring 340 is adopted to seal the second cavity 130, so that creep deformation and relaxation caused by axial load to the cover plate 113 can be reduced, and the service life of the product is prolonged.

Preferably, referring to fig. 2b and fig. 6, the housing 100 has a set of mounting holes 190 at the connection between the intermediate member 112 and the cover plate 113, and the set of mounting holes 190 is disposed around the outer circumference of the housing 100 for connecting the variable turbine geometry turbocharger. The second cavity 130 can be further sealed by the mounting hole group 190, so that the cost of raw materials is effectively reduced, and the light-weight design requirement of the product is met.

In summary, in the actuator for a variable turbine geometry turbocharger provided by the present invention, the actuator includes a housing, a motor, and a speed change assembly, the housing has a first cavity and a second cavity sequentially arranged along an axial direction, and the first cavity and the second cavity are communicated through a first communication hole; the motor is arranged in the first cavity, and an output shaft of the motor penetrates through the first communication hole to enter the second cavity; the speed change assembly is arranged in the second cavity, the input end of the speed change assembly is coupled with the output shaft of the motor, and the output end of the speed change assembly penetrates out of the shell and is used for being connected with a guide vane of the turbocharger with the variable turbine geometry. According to the configuration, the motor is used as a power source to be decoupled with the air pressure in the supercharger, the output characteristic is optimized by the speed change assembly, the adjusting characteristic curve can be changed randomly, and the special requirements of different users on the variable turbine geometry turbocharger characteristic curve under different working conditions are met.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. An actuator for a variable turbine geometry turbocharger comprising a housing, an electric motor and a speed change assembly, wherein,

2. The actuator of claim 1, wherein the shift assembly includes, in order along the input to the output, a first gear, a second gear, a third gear, a fourth gear, a fifth gear, and an output;

3. The actuator of claim 1, wherein the fifth gear is a sector gear.

4. The actuator of claim 2, further comprising a control assembly disposed within the second cavity, the control assembly comprising: a permanent magnet and a PCBA, wherein,

5. The actuator of claim 4, wherein the PCBA mounting and positioning base station has a sensor communication pin set therein, and the sensor communication pin set and the Hall sensor are connected in a press fit manner through a flexible fisheye pin terminal.

6. Actuator according to claim 2, wherein the housing has a second communication hole communicating with the second chamber and covered by a waterproof and breathable membrane.

7. The actuator of claim 1, wherein the housing comprises, in order along the first cavity toward the second cavity, an end cap, an intermediate piece, and a cover plate;

the end cover and the middle piece are enclosed to form the first cavity, the middle piece and the cover plate are enclosed to form the second cavity, and the end cover and the cover plate are respectively detachably connected with the middle piece.

8. The actuator of claim 7, wherein the intermediate member includes a motor positioning surface and a reversible step disposed in the first cavity, the motor positioning surface being disposed on an end surface of the first cavity adjacent to the second cavity for limiting axial displacement of the motor relative to the intermediate member in a direction away from the end cap; the reversing step extends along the axial direction of the first cavity and is used for limiting the circumferential rotation of the motor relative to the intermediate piece.

9. The actuator of claim 8, wherein the intermediate member is provided with a pressing groove on the periphery of one end thereof facing the end cap, the end cap is connected with the intermediate member through the pressing groove, and a wave spring and a gasket are sequentially arranged between the end cap and the motor, and the wave spring and the gasket are used for limiting the axial displacement of the motor relative to the intermediate member in the direction of the end cap.

10. The actuator of claim 7, wherein the intermediate piece and the cover plate are connected by screws or bolts.

11. The actuator of claim 7, further comprising a radial seal disposed at the junction of the intermediate piece and the cover plate.

12. The actuator of claim 7, wherein the housing has a set of mounting holes at the junction of the intermediate member and the cover plate, the set of mounting holes being disposed around the outer periphery of the housing for connection to the variable turbine geometry turbocharger.