Turbocharger fork mechanism with self-lubricating bushings

Abstract

This utility model discloses a turbocharger shift fork mechanism with a self-lubricating bushing, relating to the field of turbocharger technology. The mechanism includes a shift fork body that rotates on a mounting plate. An actuating plate is mounted on the mounting plate and is limited by a roller pin. A bushing assembly is fitted onto the shift fork body, slidingly engaging with a notch in the actuating plate. The shift fork body is engaged within the notch by the bushing assembly and rotates with the actuating plate. This utility model, by using a bushing assembly made of self-lubricating composite material with an oil reservoir, internal oil passage, and sealing lip, combined with a multi-positioning anti-slip structure and a flip-top oil replenishment design, significantly improves the lubrication durability, wear resistance, operational stability, and maintenance convenience of the shift fork mechanism. It effectively avoids jamming and wear, extending the service life of the turbocharger adjustment mechanism.

Description

Technical Field

[0001] This utility model relates to the field of turbocharger technology, and in particular to a turbocharger shift fork mechanism with a self-lubricating bushing. Background Technology

[0002] In the variable geometry or exhaust bypass adjustment mechanism of a turbocharger, the shift fork, as a key transmission component, is connected to the actuator at one end and needs to be engaged in the notch of the shift disc that rotates with the turbine shaft to achieve synchronous adjustment of the guide vanes or bypass valve. During operation, the shift fork is subjected to harsh conditions of high temperature, high frequency oscillation or rotation for a long time, and its contact surface with the notch of the shift disc is prone to wear due to friction.

[0003] Traditional metal-to-metal direct contact structures or simple surface treatments have poor lubrication performance, and the lubricating medium is easily lost, which can easily lead to dry friction on the contact surface, resulting in jamming, wear, or even failure. This seriously affects the response speed and operational reliability of the turbocharger. Although there are designs that use self-lubricating materials in existing technologies, they generally suffer from problems such as unsustainable lubrication, difficulty in replenishing the lubricating medium, and unreliable fixation of self-lubricating components on the shift fork body, which can easily lead to relative sliding or torsion, resulting in insufficient overall durability and stability. Utility Model Content

[0004] This utility model provides a turbocharger shift fork mechanism with a self-lubricating bushing, including a shift fork body, which rotates on a mounting plate. A shift plate is also provided on the mounting plate, and the shift plate is limited by a roller pin. A bushing assembly is sleeved on the shift fork body, which is used to form a sliding fit with the notch of the shift plate. The shift fork body is engaged in the notch by the bushing assembly and rotates with the shift plate.

[0005] Preferably, the bushing assembly includes a pair of lubricating sleeves, which are fitted onto one end of the shift fork body and secured with bolts.

[0006] Preferably, the lubricating sleeve is made of a composite material of polytetrafluoroethylene, polyoxymethylene and oil-impregnated nylon, and has self-lubricating properties and wear resistance.

[0007] Preferably, the surface of the lubricating sleeve is provided with a plurality of oil storage pits that open onto the friction contact surface. The oil storage pits are used to store the lubricating medium during the operation of the lubricating sleeve and to slowly release it to the contact surface between the lubricating sleeve and the actuating disc under the action of friction pressure, so as to form a lubricating film.

[0008] Preferably, the lubrication sleeve has several vertical oil passages inside, and the oil storage pit is arranged horizontally and communicates with the oil passages.

[0009] Preferably, the upper and lower ends of the lubricating sleeve are provided with sealing lips, which are in close contact with the upper and lower end faces of the notch to prevent external contaminants from entering and to reduce the loss of lubricating medium on the contact surface.

[0010] Preferably, the upper side of the lubrication sleeve is provided with a flip cover that can be flipped upward on one side, and the flip cover covers the upper side of the oil inlet of the oil passage.

[0011] Preferably, both sides of the shift fork body are provided with positioning grooves, and the positioning strip provided on the inner wall of the lubrication sleeve slides into the positioning grooves when it is fitted.

[0012] Preferably, a groove is formed at one end of the shift fork body, and a boss is provided on the inner side of the lubrication sleeve, with the boss inserted into the groove.

[0013] Preferably, the upper and lower surfaces of the shift fork body are provided with anti-slip grooves, and the upper and lower inner walls of the lubrication sleeve are provided with anti-slip strips, which are embedded in the anti-slip grooves.

[0014] This utility model provides a turbocharger shift fork mechanism with a self-lubricating bushing, which, compared with the prior art:

[0015] 1. This utility model features a bushing assembly consisting of a pair of lubricating sleeves on the shift fork body. The lubricating sleeves are made of self-lubricating composite materials such as polytetrafluoroethylene, polyoxymethylene, and oil-impregnated nylon. This reduces the coefficient of friction between the shift fork and the notch of the shift disc. The oil storage pits on the surface of the lubricating sleeves can store the lubricating medium for a long time and release it slowly under frictional pressure, continuously forming a lubricating film on the contact surface. At the same time, the vertical oil passages inside are connected to the horizontal oil storage pits, forming an efficient internal lubrication network, which further ensures the durability and uniformity of lubrication. Combined with the sealing lips at the upper and lower ends, it effectively prevents the loss of lubricating medium and the intrusion of external dust and impurities, improving the wear resistance, stability and service life of the shift fork mechanism under high temperature and high speed conditions, and avoiding jamming or wear failure caused by dry friction.

[0016] 2. The bushing assembly and shift fork body of this utility model adopt a multi-positioning and anti-slip structure to ensure the reliability of assembly and the stability of operation. By setting positioning grooves, recesses and anti-slip grooves on the shift fork body, and setting positioning strips, bosses and anti-slip strips on the inner wall of the lubrication sleeve, comprehensive circumferential, axial and rotational direction limiting is achieved to prevent relative sliding or torsion of the lubrication sleeve during operation. In particular, the flip-up cover design covers the oil inlet of the oil passage, which allows the internal replenishment of lubricating medium when necessary, and can also play a sealing and dustproof role during normal operation. It takes into account the convenience of later maintenance and the sealing performance of daily operation. The overall structure design is reasonable, and the disassembly and maintenance are convenient, which improves the reliability and durability of the turbocharger adjustment mechanism. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the shift fork body and other components according to an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the notch structure according to an embodiment of the present utility model;

[0021] Figure 4 This is a schematic diagram of the bushing assembly in the sleeve state according to an embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the bushing assembly in disassembly state according to an embodiment of the present utility model;

[0023] Figure 6 This is a schematic diagram of the anti-slip groove in an embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the bushing assembly disassembled according to an embodiment of the present utility model;

[0025] Figure 8 This is a cross-sectional schematic diagram of the oil passage structure according to an embodiment of the present utility model.

[0026] Reference numerals: 1. Shift fork body; 11. Anti-slip groove; 12. Positioning groove; 13. Groove; 2. Shift disc; 3. Roller pin; 4. Notch; 5. Bushing assembly; 51. Lubrication sleeve; 52. Sealing lip; 53. Oil passage; 54. Oil reservoir; 55. Anti-slip strip; 56. Positioning strip; 57. Flip cover; 58. Boss. Detailed Implementation

[0027] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] Please refer to Figures 1 to 3 This utility model embodiment provides a turbocharger shift fork mechanism with a self-lubricating bushing, including a shift fork body 1, a shift disk 2, a roller pin 3, a notch 4, and a bushing assembly 5.

[0029] The shift fork body 1 is rotatably mounted on the mounting plate of the turbocharger via a pin or bearing. One end of the shift fork body is hinged to the push rod of the actuator. A shift disk 2 is coaxially arranged on the mounting plate. The shift disk 2 is connected to the turbine shaft via a limiting structure such as a roller pin 3 and can rotate synchronously with the turbine shaft. The outer edge of the shift disk 2 is provided with a radial notch 4 to accommodate the head of the shift fork body 1.

[0030] like Figure 4 and Figure 5 As shown, a bushing assembly 5 is fitted around the head of the shift fork body 1. The bushing assembly 5 consists of a pair of symmetrically arranged lubricating sleeves 51. The two lubricating sleeves 51 are fitted onto the head of the shift fork body 1 from both sides and are fastened together by bolts to form a complete annular bushing structure that wraps around the contact area between the shift fork body 1 and the notch 4 of the shift disc 2.

[0031] like Figures 6 to 8 As shown, in order to ensure that the lubrication sleeve 51 is firmly installed on the shift fork body 1 without relative displacement, positioning grooves 12 extending axially are provided on the outer walls of both sides of the shift fork body 1, and positioning strips 56 are provided at corresponding positions on the inner wall of the lubrication sleeve 51. During assembly, the positioning strips 56 slide into the positioning grooves 12 to achieve preliminary positioning in the circumferential and axial directions.

[0032] Furthermore, a groove 13 is provided on one end face of the head of the shift fork body 1, and a matching boss 58 is provided on the inner side of the lubrication sleeve 51. The boss 58 is inserted into the groove 13 to prevent the lubrication sleeve 51 from moving axially.

[0033] In addition, anti-slip grooves 11 are provided on the upper and lower surfaces of the head of the shift fork body 1, and anti-slip strips 55 are provided on the upper and lower inner walls of the lubrication sleeve 51. After assembly, press down to make the anti-slip strips 55 embed into the anti-slip grooves 11, effectively preventing the lubrication sleeve 51 from sliding or twisting in the vertical direction.

[0034] like Figure 8 As shown, the lubrication sleeve 51 is made of a composite material with excellent self-lubricating properties and wear resistance, preferably a mixture of two or more materials selected from polytetrafluoroethylene, polyoxymethylene and oil-impregnated nylon. On the inner surface of the lubrication sleeve 51 that contacts the side wall of the notch 4 of the actuating disc 2, there are multiple oil storage pits 54 that open into the friction contact surface. These oil storage pits 54 can store lubricating grease or graphite and other lubricating media during the operation of the lubrication sleeve 51, and slowly release them under the pressure and temperature generated by friction, continuously forming a lubricating film on the contact surface and reducing the coefficient of friction.

[0035] To further improve lubrication effect and durability, the lubrication sleeve 51 is provided with several vertical oil passages 53 along the axial direction, and the oil storage pits 54 are arranged horizontally and connected to them to form an internal lubrication network. When the external lubricating medium is injected through the oil replenishment port, it can be transported to each oil storage pit 54 through the oil passages 53 to achieve the replenishment and uniform distribution of the internal lubricating medium.

[0036] like Figure 7 As shown, in order to prevent the loss of lubricating medium and the intrusion of external dust and impurities, sealing lips 52 with inward folding are provided at the upper and lower ends of the lubrication sleeve 51. After assembly, the sealing lips 52 are tightly fitted to the upper and lower end faces of the notch 4 of the actuation disk 2, forming an effective sealing barrier.

[0037] In particular, one of the lubrication sleeves 51 has a flexible connecting structure on its upper side with a flip cover 57 that can be flipped upwards. Under normal conditions, the flip cover 57 covers the oil inlet of the oil passage 53 and acts as a seal. When it is necessary to add lubricating medium, the flip cover 57 can be flipped upwards and grease can be injected through the oil inlet. The operation is convenient and achieves maintenance without disassembly in the later stage.

[0038] The working process of this utility model is as follows: When the turbocharger is working, the actuator drives the shift fork body 1 to swing. The shift fork body 1 pushes the shift disk 2 to rotate through the bushing assembly 5 at its head, thereby adjusting the airflow channel at the turbine end. During the movement, the lubricating sleeve 51 of the bushing assembly 5 continuously slides in contact with the side wall of the notch 4 of the shift disk 2. The lubricating medium stored in the oil reservoir 54 is slowly released under the action of frictional heat and pressure to form a lubricating film. At the same time, if the lubricating medium is insufficient, grease can be added to the oil passage 53 by opening the flip cover 57. The grease is transported to each oil reservoir 54 through the passage to ensure long-term effective lubrication. The multiple positioning and anti-slip structure ensures that there is no relative displacement between the lubricating sleeve 51 and the shift fork body 1, and the sealing lip 52 effectively isolates contaminants.

[0039] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A turbocharger fork mechanism with self-lubricating bushings, characterized by: The device includes a shift fork body (1), which rotates on a mounting plate. A shift plate (2) is also mounted on the mounting plate. The shift plate (2) is limited by a roller pin (3). A bushing assembly (5) is fitted on the shift fork body (1). The bushing assembly (5) is used to form a sliding fit with the notch (4) of the shift plate (2). The shift fork body (1) is engaged in the notch (4) by the bushing assembly (5) and rotates with the shift plate (2).

2. The turbocharger fork mechanism with self-lubricating bushings of claim 1, wherein: The bushing assembly (5) includes a pair of lubricating sleeves (51), which are fitted onto one end of the shift fork body (1) and fixed by bolts.

3. The turbocharger fork mechanism with self-lubricating bushings of claim 2, wherein: The lubrication sleeve (51) is made of a variety of composite materials, including polytetrafluoroethylene, polyoxymethylene and oil-impregnated nylon, and has self-lubricating properties and wear resistance.

4. The turbocharger fork mechanism with self-lubricating bushings of claim 3, wherein: The surface of the lubricating sleeve (51) is provided with a number of oil storage pits (54) that open into the friction contact surface. The oil storage pits (54) are used to store the lubricating medium during the operation of the lubricating sleeve (51) and slowly release it to the contact surface between the lubricating sleeve (51) and the actuating disk (2) under the action of friction pressure to form a lubricating film.

5. The turbocharger fork mechanism with self-lubricating bushings of claim 4, wherein: The lubrication sleeve (51) has several vertical oil passages (53) inside, and the oil storage pit (54) is arranged horizontally and connected to the oil passages (53).

6. The turbocharger fork mechanism with self-lubricating bushings of claim 5, wherein: The lubricating sleeve (51) has sealing lips (52) at both the upper and lower ends. The sealing lips (52) are in close contact with the upper and lower end faces of the notch (4) to prevent external contaminants from entering and to reduce the loss of lubricating medium on the contact surface.

7. The turbocharger fork mechanism with self-lubricating bushings of claim 6, wherein: The upper side of the lubrication sleeve (51) is provided with a flip cover (57) that can be flipped upward on one side, and the flip cover (57) covers the upper side of the oil inlet of the oil passage (53).

8. The turbocharger fork mechanism with self-lubricating bushings of claim 1, wherein: The shift fork body (1) is provided with positioning grooves (12) on both sides, and the positioning strip (56) provided on the inner wall of the lubrication sleeve (51) slides into the positioning groove (12) when it is put on.

9. The turbocharger fork mechanism with self-lubricating bushings of claim 8, wherein: A groove (13) is provided at one end of the shift fork body (1), and a boss (58) is provided on the inner side of the lubrication sleeve (51), with the boss (58) inserted into the groove (13).

10. The turbocharger fork mechanism with self-lubricating bushings of claim 9, wherein: The upper and lower surfaces of the shift fork body (1) are provided with anti-slip grooves (11), and the upper and lower inner walls of the lubrication sleeve (51) are provided with anti-slip strips (55), which are embedded in the anti-slip grooves (11).

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