A turbocharger wastegate valve and turbocharger

Abstract

This invention provides a turbocharger exhaust gas bypass valve and a turbocharger. The exhaust gas bypass valve includes a drive assembly, a connecting arm, a valve plate, and a connecting rivet. The connecting arm is fixedly connected to the drive assembly, and one end of the connecting arm has a through hole through which the connecting rivet is connected to the connecting arm. The valve plate is riveted and fixed to the connecting rivet. The connecting rivet has a stop surface, and the connecting arm has a stop portion that abuts against the stop surface to restrict the connecting rivet from rotating around its own axis. The stop portion and the stop surface of this invention effectively prevent the connecting rivet and the valve plate from rotating around their own axes, avoiding severe friction between the valve plate and the volute housing due to relative rotation, reducing wear, and improving the sealing reliability and service life of the valve plate.

Description

Technical Field

[0001] This invention relates to the field of turbocharger technology, and specifically to a turbocharger exhaust bypass valve and a turbocharger. Background Technology

[0002] A turbocharger is a device that uses the inertial force of exhaust gases from an engine to drive a turbine, thereby compressing the intake air and increasing the engine's intake air volume. Turbocharging technology is an important energy-saving measure for engines, effectively increasing engine power and improving fuel economy. To ensure low-speed torque, the turbocharger's turbine end typically uses a turbine with a small moment of inertia, i.e., a smaller diameter turbine; however, to prevent turbine failure due to overspeed at high engine speeds, an exhaust gas bypass device is required at the turbine end. The exhaust gas bypass valve is a crucial control component in a turbocharging system. Its main function is to limit the turbine speed at high engine speeds and loads, thereby controlling the boost pressure, preventing over-boosting, and protecting the engine and turbine itself. The exhaust gas bypass valve is designed to allow exhaust gases to exit from the exhaust gas inlet side of the turbine housing through a bypass path controlled by the valve to the turbine outlet, thereby reducing the energy supplied to the turbine, lowering the turbine and impeller speeds, and ultimately reducing the compressor's output pressure, i.e., lowering the engine's intake pressure.

[0003] The valve plate assembly of the existing stamping waste gas bypass valve device consists of a valve plate, connecting arm, connecting rivets, rotating shaft, bushing, rocker arm, and drive pin. In early stamping waste gas bypass valve devices, the valve plate was affected by the impact and vibration of the waste gas flow during operation. The valve plate would rotate around its own axis. Under harsh conditions such as heavy load, this would cause wear on the valve contact parts, leading to valve sealing failure and other reliability issues.

[0004] In summary, there is an urgent need for a turbocharger exhaust bypass valve and a turbocharger to solve or at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a turbocharger exhaust bypass valve and a turbocharger, aiming to solve the problem in existing designs where the valve plate easily rotates around its own axis during operation, leading to valve sealing failure. The specific technical solution is as follows: A turbocharger exhaust bypass valve includes a drive assembly, a connecting arm, a valve plate, and a connecting rivet. The connecting arm is fixedly connected to the drive assembly, and a through hole is provided at the end of the connecting arm away from the drive assembly. The connecting rivet is connected to the connecting arm through the through hole. The valve plate is riveted and fixedly connected to the connecting rivet. A stop surface is provided on the connecting rivet, and a stop portion is provided on the connecting arm. The stop portion abuts against the stop surface to restrict the connecting rivet from rotating around its own axis.

[0006] Preferably, the stop surface is located on the side of the connecting rivet away from the valve plate.

[0007] Preferably, the stop portion is formed by bending the end of the connecting arm away from the drive assembly toward the stop surface.

[0008] Preferably, the drive assembly includes a rotating shaft, a rocker arm, a transmission pin, and a bushing. The connecting arm is fixedly connected to the first end of the rotating shaft, the rocker arm is fixedly connected to the second end of the rotating shaft, and the transmission pin is fixedly connected to the end of the rocker arm away from the rotating shaft. The bushing is coaxially sleeved on the rotating shaft.

[0009] Preferably, the connecting arm is formed by bending a steel plate; the end of the connecting arm near the rotating shaft is bent from a steel plate and covers the outer periphery of the rotating shaft; the end of the connecting arm away from the rotating shaft extends outward radially along the rotating shaft, and the end is bent to form a stop; the through hole is located between the stop and the rotating shaft; and the through hole is spatially perpendicular to the rotating shaft.

[0010] Preferably, the connecting arm is provided with welding holes, which are located at one end of the connecting arm that covers the rotating shaft, and are arranged radially through the connecting arm along the rotating shaft.

[0011] Preferably, the end of the connecting arm away from the rotating shaft is formed by folding and stacking the two ends of a steel plate, wherein the end of the steel plate away from the valve plate away from the rotating shaft is bent toward the stop surface to form a stop portion.

[0012] Preferably, the stop portion and the stop surface are in planar contact or line contact.

[0013] Preferably, a groove is provided on the side of the valve plate away from the connecting arm, and the end of the connecting rivet away from the connecting arm does not extend beyond the opening plane of the groove.

[0014] On the other hand, this application also provides a turbocharger, including a volute housing and the aforementioned turbocharger exhaust gas bypass valve; the turbocharger exhaust gas bypass valve is mounted on the volute housing, the volute housing is provided with a bypass hole, and the valve plate in the turbocharger exhaust gas bypass valve is arranged corresponding to the bypass hole for adjusting the size of the bypass hole or closing the bypass hole.

[0015] The application of the technical solution of the present invention has the following beneficial effects: Through the design of the above structure, during operation, the gas entering the volute impacts the valve plate. By riveting the valve plate to the connecting rivet, and providing a stop surface on the rivet, the stop on the connecting arm abuts against the stop surface on the connecting rivet, thus limiting the movement of the connecting rivet and preventing it from rotating around its own axis. This, in turn, prevents the valve plate from rotating around its own axis during operation, thereby preventing severe friction caused by the valve plate rotating relative to the volute, reducing wear at the contact points between the valve plate and the volute, preventing failure due to wear of both the valve plate and the volute, and improving reliability.

[0016] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a turbocharger exhaust bypass valve according to the present invention; Figure 2 This is a cross-sectional view of a turbocharger exhaust bypass valve according to the present invention; Figure 3 This is a schematic diagram of the overall structure of a second embodiment of a turbocharger exhaust bypass valve according to the present invention; Figure 4 This is a schematic diagram of the overall structure of a turbocharger exhaust bypass valve installed inside the turbocharger volute housing according to the present invention. Figure 5 This is a cross-sectional view of a turbocharger exhaust bypass valve installed inside the turbocharger housing according to the present invention.

[0018] Among them, 1. drive assembly; 11. rotating shaft; 12. rocker arm; 13. transmission pin; 14. bushing; 2. connecting arm; 21. through hole; 22. stop part; 23. welding hole; 3. valve plate; 31. groove; 4. connecting rivet; 41. stop surface; 5. volute; 51. bypass hole. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more comprehensive description is provided below, along with preferred embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0021] Example: See Figures 1-5 This embodiment provides a turbocharger exhaust bypass valve, including a drive assembly 1, a connecting arm 2, a valve plate 3, and a connecting rivet 4. The connecting arm 2 is fixedly connected to the drive assembly 1, and a through hole 21 is provided at the end of the connecting arm 2 away from the drive assembly 1. The connecting rivet 4 is connected to the connecting arm 2 through the through hole 21. The valve plate 3 is riveted and fixedly connected to the connecting rivet 4. The connecting rivet 4 is provided with a stop surface 41, and the connecting arm 2 has a stop portion 22. The stop portion 22 abuts against the stop surface 41 to restrict the connecting rivet 4 from rotating around its own axis.

[0022] Specifically, this bypass valve is applied to a turbocharger, which includes a turbine housing 5 and a turbine. The turbine is rotatably connected inside the turbine housing 5. Engine exhaust gas enters from the intake end of the turbine housing 5 and drives the turbine to rotate. The turbine housing 5 has a bypass hole 51, which is located on the intake side of the turbine housing 5. The first end of the bypass hole 51 communicates with the intake side of the turbine housing 5, and the second end of the bypass hole 51 communicates with the outside. A valve plate 3 is connected to a connecting arm 2 by a connecting rivet 4. The connecting arm 2 is rotatably connected to the turbine housing 5 by a drive assembly 1. The valve plate 3 corresponds to the bypass... The bypass hole 51 is configured such that the drive assembly 1 drives the connecting arm 2 to rotate, which in turn drives the valve plate 3 and the connecting rivet 4 to rotate. This allows the valve plate 3 to adjust the size of the bypass hole 51 or to close it. This, in turn, adjusts the intake air volume that enters the turbine housing 5 to drive the turbine to rotate, thereby adjusting the turbine speed. Specifically, when the engine is at high speed and high load, the valve plate 3 rotates to increase the opening of the bypass hole 51, thereby controlling the boost pressure, preventing the engine from over-boosting, and protecting the engine and the turbine itself.

[0023] Research has revealed that the existing valve plate 3 is prone to rotating around its own axis during operation, which causes severe friction at the contact point between the volute 5 and the valve plate 3 due to the rotation of the valve plate 3. This leads to wear on both the volute 5 and the valve plate 3, resulting in the worn valve plate 3 being unable to accurately adjust the size of the bypass hole 51 on the volute 5.

[0024] Through the design of the above structure, during operation, the gas entering the volute 5 impacts the valve plate 3. By riveting and fixing the valve plate 3 to the connecting rivet 4, and providing a stop surface 41 on the connecting rivet 4, the stop portion 22 on the connecting arm 2 abuts against the stop surface 41 on the connecting rivet 4, thus limiting the connection rivet 4 and preventing it from rotating around its own axis; consequently, preventing the valve plate 3 from rotating around its own axis. This design prevents the valve plate 3 from rotating around its own axis during operation, thereby preventing severe friction caused by the valve plate 3 rotating relative to the volute 5, reducing wear at the contact points between the valve plate 3 and the volute 5, preventing failure due to wear of the valve plate 3 and the volute 5, and improving reliability.

[0025] In a preferred embodiment, the stop surface 41 is provided on the side of the connecting rivet 4 away from the valve plate 3.

[0026] Specifically, a flat or curved surface is milled on the side of the connecting rivet 4 away from the valve plate 3. In this embodiment, the stop surface 41 is a flat surface. The stop part 22 abuts against this flat surface to circumferentially limit the connecting rivet 4 and prevent the connecting rivet 4 from rotating around its own axis. The connecting rivet 4 has a rivet head, and the end away from the rivet head is a rivet head. The rivet head passes through the through hole 21 on the connecting arm 2 and is riveted and fixed to the valve plate 3. The stop surface 41 is provided on the side wall of the rivet head.

[0027] In a preferred embodiment, the stop portion 22 is formed by bending the end of the connecting arm 2 away from the drive assembly 1 toward the stop surface 41.

[0028] It can be seen that, through this structural design, during production and processing, the connecting rivet 4 is first inserted through the through hole 21 onto the connecting arm 2, with the stop surface 41 on the connecting rivet 4 positioned away from the drive assembly 1. Then, the connecting rivet 4 is riveted and fixed to the valve plate 3. Next, the end of the connecting arm 2 away from the drive assembly is bent, so that the bent portion of the connecting arm 2 abuts against the stop surface 41 of the connecting rivet 4. This structural design makes the stop part 22 easy to process, and the stopping effect is stable and reliable; it helps improve reliability and reduce production costs.

[0029] In a preferred embodiment, the drive assembly 1 includes a rotating shaft 11, a rocker arm 12, a transmission pin 13, and a bushing 14. The connecting arm 2 is fixedly connected to the first end of the rotating shaft 11, the rocker arm 12 is fixedly connected to the second end of the rotating shaft 11, and the transmission pin 13 is fixedly connected to the end of the rocker arm 12 away from the rotating shaft 11. The bushing 14 is connected to the rotating shaft 11. Specifically, the rotating shaft 11 passes through the volute 5 and is rotatably connected to the volute 5 through the bushing 14 sleeved outside it. By achieving relative sealing between the bushing and the volute 5, the friction between the rotating shaft 11 and the volute 5 is reduced, so that the rotating shaft 11 can rotate smoothly and avoid jamming.

[0030] It is known that the rocker arm 12 is rotated by the transmission pin 13, and then the connecting arm 2, the connecting rivet 4 and the valve plate 3 connected to the connecting arm 2 are rotated by the rotating shaft 11, so as to adjust the size of the bypass hole 51.

[0031] In a preferred embodiment, the connecting arm 2 is formed by bending a long strip of steel plate; the middle of the long strip of steel plate is bent and wraps around the outer periphery of the rotating shaft 11; the two ends of the long strip of steel plate are bent and overlapped together, and extend outward radially along the rotating shaft 11; the extended end of the connecting arm 2 is bent to form a stop 22, and abuts against the stop surface 41 of the connecting rivet 4 through the stop 22; the through hole 21 is located between the stop 22 and the rotating shaft 11; and the through hole 21 is spatially perpendicular to the rotating shaft 11.

[0032] Specifically, the two ends of the steel plates overlap, and the upper steel plate (the one furthest from the valve plate 3) extends slightly longer than the lower steel plate. The portion of the upper steel plate that extends outward and is longer than the lower steel plate is bent upward to form a stop portion 22, which abuts against the stop surface 41. In the second embodiment, the upper steel plate and the lower steel plate are of equal length, and the portion of the upper steel plate corresponding to the stop surface 41 is bent upward to form the stop portion 22, which abuts against the stop surface 41.

[0033] In a preferred embodiment, the connecting arm 2 is provided with a welding hole 23, which is located at one end of the connecting arm 2 that covers the rotating shaft 11, and the welding hole 23 is arranged to penetrate the connecting arm 2 radially along the rotating shaft 11.

[0034] It can be seen that by setting the welding holes 23, when fixing the connecting arm 2 and the rotating shaft 11, welding is performed through the welding holes 23 to weld and fix the connecting arm 2 and the rotating shaft 11, thereby improving the connection stability between the connecting arm 2 and the rotating shaft 11. Two welding holes 23 are provided, and the two welding holes 23 are respectively arranged on both sides of the rotating shaft 11; welding is performed from both sides of the rotating shaft 11, which further improves the connection stability between the connecting arm 2 and the rotating shaft 11.

[0035] In a preferred embodiment, the stop portion 22 and the stop surface 41 are in planar contact. Specifically, the stop surface 41 is planar, and the upper surface of the steel plate of the connecting arm 2 abuts against the stop surface 41 after bending, so as to achieve axial limiting of the connecting rivet 4. Of course, in some other embodiments of this application, the stop surface 41 can also be a curved surface, and the curved surface on the connecting rivet 4 is abutted by the bent steel plate. However, the curved surface cannot be an arc surface less than or equal to the diameter of the rivet head, because an arc surface less than or equal to the diameter of the rivet head cannot limit the rotation of the connecting rivet 4. Of course, the stop portion 22 and the stop member can also be in line contact. Specifically, the steel plate is bent upward so that the edge of the steel plate abuts against the stop surface 41, so as to achieve limiting of the connecting rivet 4.

[0036] In a preferred embodiment, the valve plate 3 has a groove 31 on the side away from the connecting arm 2, and the end of the connecting rivet 4 away from the connecting arm 2 does not extend beyond the opening plane of the groove 31.

[0037] Specifically, the valve plate 3 is processed by stamping, which stamps a flat steel plate into a valve plate 3 that protrudes to one side, while a groove 31 is formed on the other side of the valve plate 3. With this structural design, when installing the valve plate 3, the connecting rivet 4 passes through the valve plate 3 from the protruding side of the valve plate 3 and is riveted to the valve plate 3. After riveting, the rivet head is flattened and is located in the groove 31, without protruding from the surface of the groove 31. This design can avoid the rivet head interfering with the sealing of the valve plate 3 after riveting.

[0038] The production process and working principle of this invention are as follows: The rotating shaft 11 and the transmission pin 13 are welded to the rocker arm 12, and the sleeve is fitted onto the rotating shaft 11. The connecting arm 2 is pre-bent. A long strip of steel plate is used. During the cutting process, a welding hole 23 is cut in the middle of the long strip of steel plate. The middle of the long strip of steel plate is bent so that the bent part of the long strip of steel plate forms a cylindrical hole. The two ends of the steel plate are bent and overlapped. A through hole 21 is opened in the overlapping part of the steel plate to form the connecting arm 2. The connecting arm 2 is fitted onto the rotating shaft 11 and passes through the welding hole. 23. Weld the connecting arm 2 to the rotating shaft 11; pass the rivet head of the connecting rivet 4 through the through hole 21, and turn the stop surface 41 on the connecting rivet 4 toward the side away from the rotating shaft 11, and then rivet the connecting rivet 4 and the valve plate 3 together; then bend the steel plate on the side of the rivet head that is close to the stop surface 41 to form a stop part 22, which abuts against the stop surface 41 to limit the connecting rivet 4 and the valve plate 3 and prevent the valve plate 3 from rotating around its own axis.

[0039] On the other hand, this application also provides a turbocharger, including a volute housing 5 and the aforementioned turbocharger exhaust gas bypass valve; the turbocharger exhaust gas bypass valve is mounted on the volute housing 5, and a bypass hole 51 is provided on the volute housing 5. The valve plate 3 in the turbocharger exhaust gas bypass valve is arranged corresponding to the bypass hole 51. When it is necessary to adjust the intake volume of the volute housing 5, the connecting rod and the connecting rivet 4 and the valve plate 3 mounted on the connecting rod are driven by the drive assembly 1 to adjust the size of the bypass hole 51 or close the bypass hole 51; when the engine is at high speed and high load, the valve plate 3 is driven to rotate by the drive component to enlarge the bypass hole 51 so that more exhaust gas flows directly from the bypass hole 51 to the exhaust pipe for discharge; preventing excessive intake of the volute housing 5 from damaging the turbine; and reducing the speed of the turbine and impeller to reduce the output pressure of the turbocharger, reduce the intake pressure of the engine, and prevent damage to the engine.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A turbocharger wastegate valve characterized by: It includes a drive assembly (1), a connecting arm (2), a valve plate (3), and a connecting rivet (4). The connecting arm (2) is fixedly connected to the drive assembly (1). The end of the connecting arm (2) away from the drive assembly (1) is provided with a through hole (21). The connecting rivet (4) is connected to the connecting arm (2) through the through hole (21). The valve plate (3) is riveted and fixedly connected to the connecting rivet (4); The connecting rivet (4) is provided with a stop surface (41), and the connecting arm (2) has a stop part (22). The stop part (22) abuts against the stop surface (41) to restrict the connecting rivet (4) from rotating about its own axis.

2. The turbocharger exhaust bypass valve according to claim 1, characterized in that: The stop surface (41) is located on the side of the connecting rivet (4) away from the valve plate (3).

3. A turbocharger exhaust bypass valve according to claim 1, characterized in that: The stop (22) is formed by bending one end of the connecting arm (2) away from the drive assembly (1) toward the stop surface (41).

4. A turbocharger exhaust bypass valve according to claim 1, characterized in that: The drive assembly (1) includes a rotating shaft (11), a rocker arm (12), a transmission pin (13), and a bushing (14). The connecting arm (2) is fixedly connected to the first end of the rotating shaft (11), the rocker arm (12) is fixedly connected to the second end of the rotating shaft (11), and the transmission pin (13) is fixedly connected to the end of the rocker arm (12) away from the rotating shaft (11). The bushing (14) is connected to the rotating shaft (11) together with the bushing (14).

5. A turbocharger exhaust bypass valve according to any one of claims 1-4, characterized in that: The connecting arm (2) is formed by bending a steel plate; The end of the connecting arm (2) near the rotating shaft (11) is bent by a steel plate and covers the outer periphery of the rotating shaft (11); the end of the connecting arm (2) away from the rotating shaft (11) extends radially outward along the rotating shaft (11), and the end is bent to form the stop (22); The through hole (21) is located between the stop (22) and the rotating shaft (11); and the through hole (21) and the rotating shaft (11) are spatially perpendicular.

6. A turbocharger exhaust bypass valve according to claim 5, characterized in that: The connecting arm (2) is provided with a welding hole (23), which is located at one end of the connecting arm (2) covering the rotating shaft (11). The welding hole (23) is arranged to penetrate the connecting arm (2) radially along the rotating shaft (11).

7. A turbocharger exhaust bypass valve according to claim 5, characterized in that: The end of the connecting arm (2) away from the rotating shaft (11) is formed by folding and stacking the two ends of a steel plate, wherein the end of the steel plate away from the valve plate (3) away from the rotating shaft (11) is bent toward the stop surface (41) to form a stop part (22).

8. A turbocharger exhaust bypass valve according to claim 5, characterized in that: The stop portion (22) and the stop surface (41) are in planar or line contact.

9. A turbocharger exhaust bypass valve according to any one of claims 1-4, characterized in that: The valve plate (3) has a groove (31) on the side away from the connecting arm (2), and the end of the connecting rivet (4) away from the connecting arm (2) does not extend beyond the opening plane of the groove (31).

10. A turbocharger comprising a turbine wheel (5), characterized in that It also includes a turbocharger exhaust gas bypass valve according to any one of claims 1-9; the turbocharger exhaust gas bypass valve is installed on the volute (5), the volute (5) is provided with a bypass hole (51), and the valve plate (3) in the turbocharger exhaust gas bypass valve is arranged corresponding to the bypass hole (51) for adjusting the size of the bypass hole (51) or closing the bypass hole (51).

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