Transmission structure capable of blocking gas leakage path

Abstract

The utility model provides a transmission structure capable of blocking a gas leakage path, which comprises a shell provided with a mounting hole, a shaft sleeve is fixedly arranged in the mounting hole, and the inner wall of the mounting hole and the outer wall of the shaft sleeve are in a sealed state; the transmission shaft is rotationally arranged in the shaft sleeve, a sealing shaft shoulder is arranged on the transmission shaft and located in the shell, a sealing end face is arranged at the end, located in the shell, of the shaft sleeve, and the sealing end face makes contact with the sealing shaft shoulder; and the driven part is fixedly arranged at the output end of the transmission shaft, and an elastic gasket in a pressed state is arranged between the driven part and the shaft sleeve. The elastic gasket in a pressed state can provide elastic force between the shaft sleeve and the transmission shaft for real-time compensation of an axial gap, so that the sealing end face and the sealing shaft shoulder are always kept in an attached state, and the situation of gas leakage caused by the gap generated by abrasion or thermal deformation is prevented.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, specifically to a transmission structure that can block gas leakage paths. Background Technology

[0002] In the traditional connection structure of rocker arm and drive shaft, the drive shaft is rotatably mounted in the bushing, and the shoulder on the drive shaft is in direct contact with the inner end face of the bushing. The rocker arm is fixed to the output end of the drive shaft and is in direct contact with the outer end face of the bushing. This structure has the following problems: 1) After long-term use, the mating surfaces will have gaps due to wear, resulting in a decrease in transmission accuracy and an increase in vibration and noise; 2) The existence of gaps can easily lead to sealing failure and affect the airtightness of the system (such as causing air leakage at the turbocharger vortex end).

[0003] Although technicians have tried to improve the situation by increasing lubrication or adjusting tolerances, the shortcomings of the traditional rocker arm and drive shaft connection structure cannot be effectively solved because the axial clearance cannot be dynamically compensated and the airtightness and vibration reduction requirements are difficult to meet simultaneously.

[0004] In summary, there is an urgent need for a transmission structure that can block gas leakage paths to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this utility model is to provide a transmission structure that can block gas leakage paths, aiming to solve the problems of gas leakage and increased vibration and noise caused by wear and gaps in existing transmission structures. The specific technical solution is as follows:

[0006] A transmission structure capable of blocking gas leakage paths, comprising:

[0007] The housing has a mounting hole, in which a bushing is fixedly installed, and the inner wall of the mounting hole and the outer wall of the bushing are sealed.

[0008] A drive shaft is rotatably mounted in the bushing. The drive shaft has a sealing shoulder located inside the housing. The bushing has a sealing end face at one end inside the housing, and the sealing end face is in contact with the sealing shoulder.

[0009] The driven component is fixedly mounted at the output end of the transmission shaft, and an elastic gasket under pressure is provided between the driven component and the bushing.

[0010] Preferably, the bushing is provided with a mounting groove, and the elastic gasket is disposed in the mounting groove.

[0011] Preferably, the depth of the mounting groove is 50%-80% of the thickness of the elastic gasket.

[0012] Preferably, the mounting groove is annular, and the diameter of the mounting groove is larger than the outer diameter of the elastic gasket.

[0013] Preferably, the bushing and the mounting hole are interference fit.

[0014] Preferably, the surface roughness of both the sealing shoulder and the sealing end face is less than or equal to Ra1.6.

[0015] Preferably, the elastic pad is an elastic material that can withstand temperatures above 800 degrees Celsius, or a composite material of metal and rubber.

[0016] The application of the technical solution of this utility model has the following beneficial effects:

[0017] In the transmission structure of this utility model, the bushing and the mounting hole are in a sealed state, which blocks the possibility of gas inside the housing leaking from the gap between the bushing and the mounting hole. The sealing shoulder on the transmission shaft is in contact with the sealing end face at the end of the bushing, which also blocks the possibility of gas inside the housing leaking from the gap between the transmission shaft and the bushing. Thus, the purpose of preventing gas leakage inside the housing and improving airtightness is achieved.

[0018] In the transmission structure of this invention, the elastic gasket, positioned under pressure between the driven component and the bushing, provides an elastic force (i.e., preload) between the bushing and the transmission shaft to compensate for axial clearance in real time. This ensures that the sealing end face and the sealing shoulder remain in contact, preventing gas leakage due to gaps caused by wear or thermal deformation. Simultaneously, because it can compensate for axial clearance in real time, it effectively eliminates vibration and noise generated during movement, improving motion accuracy. The transmission structure of this invention is highly suitable for use in engines, compressors, turbochargers, and other devices requiring high airtightness and low vibration and noise.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the transmission structure of this utility model;

[0022] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle;

[0024] Among them, 1. housing, 2. bushing, 2.1. mounting groove, 2.2. sealing end face, 3. elastic gasket, 4. drive shaft, 4.1. sealing shoulder, 5. driven component. Detailed Implementation

[0025] To facilitate understanding of this invention, a more comprehensive description is provided below, along with preferred embodiments. However, this 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 more thorough and complete understanding of the disclosure of this invention.

[0026] 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0027] Example:

[0028] See Figures 1-3 This embodiment provides a transmission structure capable of blocking gas leakage paths, including:

[0029] The housing 1 has a mounting hole, in which a bushing 2 is fixedly installed. The inner wall of the mounting hole and the outer wall of the bushing 2 are in a sealed state.

[0030] A drive shaft 4 is rotatably mounted in the bushing 2. The drive shaft 4 is provided with a sealing shoulder 4.1 and the sealing shoulder 4.1 is located inside the housing 1. The bushing 2 is provided with a sealing end face 2.2 at one end inside the housing 1. The sealing end face 2.2 is in contact with the sealing shoulder 4.1 to form a seal.

[0031] The driven component 5 is fixedly installed at the output end of the transmission shaft 4, and an elastic gasket 3 under pressure is provided between the driven component 5 and the bushing 2.

[0032] In the transmission structure of this embodiment, the bushing and the mounting hole are in a sealed state, blocking the possibility of gas leakage from the housing through the gap between the bushing and the mounting hole. Furthermore, the sealing shoulder 4.1 on the transmission shaft 4 is in contact with the sealing end face of the bushing 2, further blocking the possibility of gas leakage from the housing through the gap between the transmission shaft and the bushing. This achieves the purpose of preventing gas leakage from the housing 1 and improving airtightness. Secondly, the elastic gasket 3, which is under pressure between the driven component 5 and the bushing 2, provides an elastic force between the bushing and the transmission shaft to compensate for axial clearance, ensuring that the sealing end face 2.2 and the sealing shoulder 4.1 always remain in contact, preventing gas leakage due to wear-induced gaps between the sealing end face 2.2 and the sealing shoulder 4.1.

[0033] See Figure 1 and Figure 2 The bushing 2 is provided with a mounting groove 2.1, and the elastic gasket 3 is disposed in the mounting groove 2.1. One side of the elastic gasket 3 abuts against the driven member 5, and the other side abuts against the bottom surface of the mounting groove 2.1. The mounting groove 2.1 provides an installation position for the elastic gasket 3, constrains the position of the elastic gasket after installation, and can also pre-position the elastic gasket during installation.

[0034] Furthermore, the driven component 5 is a rocker arm, which is fixedly mounted on the output end of the transmission shaft (i.e., the end of the transmission shaft located outside the housing). The output end of the transmission shaft is provided with a limiting shoulder, which is flush with the bottom surface of the mounting groove 2.1. Preferably, in this embodiment, laser welding is used to achieve the fixed connection and power transmission between the driven component and the transmission shaft; of course, in some embodiments, other structural forms may be used to achieve the fixed connection and power transmission between the driven component and the transmission shaft, such as setting a nut at the end of the transmission shaft for locking, and setting a flat key between the transmission shaft and the driven component to transmit driving force.

[0035] Preferably, the depth of the mounting groove 2.1 is 50%-80% of the thickness of the elastic gasket 3, ensuring that the elastic gasket 3 can be accommodated, while ensuring that the elastic gasket is under pressure after assembly.

[0036] Preferably, the mounting groove 2.1 is annular, and the diameter of the mounting groove 2.1 is larger than the outer diameter of the elastic gasket 3, so as to ensure that the mounting groove 2.1 will not affect the deformation of the elastic gasket, and there is enough space to accommodate the deformed elastic gasket 2.1 (the outer diameter of the elastic gasket will increase to a certain extent after deformation).

[0037] Preferably, in this embodiment, the bushing 2 and the mounting hole are interference-fitted, thereby fixing the bushing in the mounting hole and simultaneously sealing it to block the gas leakage path between the bushing and the mounting hole. Furthermore, in some embodiments, a sealing ring may be provided to improve the sealing effect.

[0038] Preferably, the surface roughness of both the sealing shoulder 4.1 and the sealing end face 2.2 is less than or equal to Ra1.6, thereby ensuring a tight fit between the two surfaces and effectively blocking the gas leakage path. At the same time, the superior surface roughness can also effectively reduce wear between the sealing shoulder 4.1 and the sealing end face 2.2.

[0039] Preferably, the elastic gasket 3 is an elastic material resistant to temperatures above 800 degrees Celsius, or a composite material of metal and rubber. In this embodiment, the elastic gasket is a high-performance nickel-based alloy.

[0040] In the transmission structure of this embodiment, only the transmission shaft and the driven component are in motion. Relative movement occurs between the sealing end face and the sealing shoulder, between the driven component and the elastic gasket, and between the transmission shaft and the bushing. This relative movement causes axial gaps to appear between the sealing end face and the sealing shoulder, and between the driven component and the elastic gasket, due to wear. The compressed elastic gasket generates a spring force that keeps the sealing end face and the sealing shoulder, and between the driven component and the elastic gasket, in a tight fit. This compensates for the axial gap, prevents gas leakage due to the gap between the sealing end face and the sealing shoulder, and prevents vibration and noise caused by the axial gap.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A transmission structure capable of blocking gas leakage paths, characterized in that, The utility model relates to a kind of drive shafts, including: Shell (1), which is provided with a mounting hole, the mounting hole is fixed with a shaft sleeve (2), the inner wall of the mounting hole and the outer wall of the shaft sleeve (2) are in a sealed state; A transmission shaft (4) is rotatably arranged in the shaft sleeve (2), the transmission shaft (4) is provided with a sealing shaft shoulder (4.1) and the sealing shaft shoulder (4.1) is located inside the shell (1), one end of the shaft sleeve (2) located in the shell (1) is provided with a sealing end face (2.2), and the sealing end face (2.2) and the sealing shaft shoulder (4.1) are in contact; A driven part (5) is fixedly arranged on the output end of the transmission shaft (4), and the driven part (5) and the shaft sleeve (2) are provided with an elastic gasket (3) in a compressed state.

2. The drive structure capable of blocking a gas leakage path according to claim 1, characterized by, The shaft sleeve (2) is provided with a mounting groove (2.1), and the elastic gasket (3) is arranged in the mounting groove (2.1).

3. The drive structure capable of blocking a gas leakage path according to claim 2, characterized by, The depth of the mounting groove (2.1) is 50%-80% of the thickness of the elastic gasket (3).

4. The drive structure capable of blocking a gas leakage path according to claim 3, characterized by, The mounting groove (2.1) is annular, and the diameter of the mounting groove (2.1) is greater than the outer diameter of the elastic gasket (3).

5. The drive structure capable of blocking a gas leakage path according to any one of claims 1 to 4, characterized in that, The shaft sleeve (2) and the mounting hole are in interference fit.

6. The drive structure capable of blocking a gas leakage path according to any one of claims 1 to 4, characterized by The surface roughness of the sealing shaft shoulder (4.1) and the sealing end face (2.2) is less than or equal to Ra1.

6.

7. The drive structure capable of blocking a gas leakage path according to any one of claims 1 to 4, characterized by, The elastic gasket (3) is made of a high-temperature-resistant elastic material with a temperature resistance of 800 degrees or above, or a composite material of metal and rubber.

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