Transmission structure capable of blocking gas leakage path

Abstract

The invention provides a transmission structure capable of blocking a gas leakage path, and the transmission structure comprises a housing which is 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 the pressed state can provide elastic force between the shaft sleeve and the transmission shaft for real-time compensation of the 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] The present invention relates to the technical field of mechanical transmission, and particularly relates to a transmission structure capable of blocking the gas leakage path. Background Art

[0002] In the connection structure of a traditional rocker arm and a transmission shaft, the transmission shaft is rotatably arranged in a bushing, a shaft shoulder is arranged on the transmission shaft and directly contacts the inner end face of the bushing, the rocker arm is fixed to the output end of the transmission shaft and directly contacts the outer end face of the bushing. This structural form has the following problems: 1) After long-term use, gaps are generated on the mating surfaces due to wear, resulting in a decrease in transmission accuracy and an increase in vibration and noise; 2) The existence of gaps easily leads to seal failure and affects the airtightness of the system (such as causing air leakage at the turbine end of a supercharger).

[0003] Although technicians have tried to improve it by increasing lubrication or adjusting tolerances, since it is impossible to dynamically compensate for the axial gap and it is difficult to balance the airtightness and vibration reduction requirements, the deficiencies existing in the connection structure of the traditional rocker arm and the transmission shaft cannot be effectively solved.

[0004] In summary, there is an urgent need for a transmission structure capable of blocking the gas leakage path to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a transmission structure capable of blocking the gas leakage path, aiming to solve the problems that the existing transmission structure generates gaps due to wear, resulting in gas leakage and an increase in vibration and noise. The specific technical solutions are as follows:

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

[0007] A housing, on which an installation hole is provided, a bushing is fixedly arranged in the installation hole, and the space between the inner wall of the installation hole and the outer wall of the bushing is in a sealed state;

[0008] A transmission shaft, which is rotatably arranged in the bushing, a sealing shaft shoulder is arranged on the transmission shaft and the sealing shaft shoulder is located inside the housing, a sealing end face is arranged at one end of the bushing located inside the housing, and the sealing end face is in contact with the sealing shaft shoulder;

[0009] A driven member, which is fixedly arranged at the output end of the transmission shaft, and an elastic gasket in a compressed state is arranged between the driven member and the bushing.

[0010] Preferably, an installation groove is provided on the bushing, and the elastic gasket is arranged in the installation groove.

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

[0012] Preferably, the installation groove body is annular, and the diameter of the installation groove body is greater than the outer diameter of the elastic gasket.

[0013] Preferably, an interference fit exists between the bushing and the installation hole.

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

[0015] Preferably, the elastic gasket is made of an elastic material resistant to high temperatures above 800 degrees, or a composite material of metal and rubber.

[0016] Applying the technical solution of the present invention has the following beneficial effects:

[0017] In the transmission structure of the present invention, a sealed state exists between the bushing and the installation hole, blocking the possibility of gas leakage from the gap between the bushing and the installation hole inside the housing. The sealing shaft shoulder on the transmission shaft is in contact with the sealing end face at the end of the bushing, blocking the possibility of gas leakage 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 the present invention, the elastic gasket in a compressed state provided between the driven member and the bushing can provide an elastic force (i.e., a pre-tightening force) between the bushing and the transmission shaft for real-time compensation of the axial clearance, ensuring that the sealing end face and the sealing shaft shoulder always remain in a fitting state, preventing gas leakage caused by the generation of gaps between the sealing end face and the sealing shaft shoulder due to wear or thermal deformation. At the same time, since the axial clearance can be compensated in real time, vibration noise generated during movement can be effectively eliminated, improving the movement accuracy. The transmission structure of the present invention is very suitable for devices such as engines, compressors, and superchargers that require high airtightness and low vibration noise.

[0019] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The following will refer to the drawings for a further detailed description of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 is a schematic diagram of the transmission structure of the present invention;

[0022] Figure 2 is Figure 1 a partial enlarged view of A in

[0023] Figure 3 isFigure 1 Partial enlarged view at position B in the middle

[0024] Wherein, 1. housing, 2. bushing, 2.1 mounting groove body, 2.2 sealing end face, 3. elastic gasket, 4. transmission shaft, 4.1 sealing shaft shoulder, 5. driven member Specific implementation manner

[0025] For the convenience of understanding the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present invention more thorough and comprehensive

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention

[0027] Embodiment

[0028] See Figures 1 - 3 , this embodiment provides a transmission structure capable of blocking the gas leakage path, including

[0029] Housing 1, on which there is a mounting hole, and a bushing 2 is fixedly arranged in the mounting hole, and the inner wall of the mounting hole and the outer wall of the bushing 2 are in a sealed state

[0030] Transmission shaft 4, which is rotatably arranged in the bushing 2, and a sealing shaft shoulder 4.1 is arranged on the transmission shaft 4 and the sealing shaft shoulder 4.1 is located inside the housing 1, and a sealing end face 2.2 is arranged at one end of the bushing 2 inside the housing 1, and the sealing end face 2.2 and the sealing shaft shoulder 4.1 are in contact with each other to form a seal

[0031] Driven member 5, which is fixedly arranged at the output end of the transmission shaft 4, and an elastic gasket 3 in a compressed state is arranged between the driven member 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 gap between the bushing and the mounting hole inside the housing. The sealed shoulder 4.1 on the transmission shaft 4 is in contact with the sealed end face at the end of the bushing 2, blocking the possibility of gas leakage from the gap between the transmission shaft and the bushing. Thus, the purpose of preventing gas leakage inside the housing 1 and improving airtightness is achieved. Secondly, the elastic gasket 3 in a compressed state between the driven member 5 and the bushing 2 can provide an elastic force between the bushing and the transmission shaft for axial clearance compensation, so that the sealed end face 2.2 and the sealed shoulder 4.1 always remain in a fitting state, preventing gas leakage caused by wear and the generation of a gap between the sealed end face 2.2 and the sealed shoulder 4.1.

[0033] See Figure 1 and Figure 2 , an installation groove 2.1 is provided on the bushing 2, the elastic gasket 3 is arranged in the installation 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 installation groove 2.1. The installation groove 2.1 can provide an installation position for the elastic gasket 3, restrict the position of the elastic gasket after installation, and can also pre-position the elastic gasket when installing the elastic gasket.

[0034] Furthermore, the driven member 5 is a rocker arm, the rocker arm is fixedly arranged at the output end of the transmission shaft (that is, the end of the transmission shaft outside the housing), a limiting shoulder is provided at the output end of the transmission shaft, and the limiting shoulder is flush with the bottom surface of the installation groove 2.1. Preferably, in this embodiment, laser welding is used to realize the fixed connection and power transmission between the driven member and the transmission shaft; of course, in some embodiments, other structural forms may be used to realize the fixed connection and power transmission between the driven member 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 member to transmit the driving force.

[0035] Preferably, the depth of the installation groove 2.1 is 50%-80% of the thickness of the elastic gasket 3, ensuring that the elastic gasket 3 can be accommodated, and at the same time realizing that the elastic gasket is in a compressed state after assembly.

[0036] Preferably, the installation groove 2.1 is annular, and the diameter of the installation groove 2.1 is larger than the outer diameter of the elastic gasket 3, ensuring that the installation groove 2.1 will not affect the deformation of the elastic gasket, and there is enough space allowance 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, an interference fit is provided between the bushing 2 and the mounting hole, thereby fixing the bushing in the mounting hole and achieving sealing to block the gas leakage path between the bushing and the mounting hole. Further, 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, so as to ensure the tight fit between the two faces and achieve the effect of blocking the gas leakage path. At the same time, a better surface roughness can also effectively reduce the wear between the sealing shoulder 4.1 and the sealing end face 2.2.

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

[0040] In the transmission structure of this embodiment, only the transmission shaft and the driven member are in motion. Relative movement will occur between the sealing end face and the sealing shoulder, between the driven member and the elastic gasket, and between the transmission shaft and the bushing. The relative movement will cause gaps in the axial direction due to wear between the sealing end face and the sealing shoulder, and between the driven member and the elastic gasket. The elastic gasket under pressure will generate an elastic force to keep the sealing end face and the sealing shoulder, and the driven member and the elastic gasket in a tightly fitting state at all times, achieving the effect of compensating for the axial gap, preventing gas leakage caused by the gap between the sealing end face and the sealing shoulder, and preventing problems such as vibration and noise in the transmission due to the axial gap.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A transmission structure capable of blocking the gas leakage path, characterized in that, Comprising: A housing (1) provided with mounting holes, in which a bushing (2) is fixedly arranged, and a sealed state is formed between the inner wall of the mounting hole and the outer wall of the bushing (2); A transmission shaft (4) rotatably arranged in the bushing (2), the transmission shaft (4) is provided with a sealing shoulder (4.1) and the sealing shoulder (4.1) is located inside the housing (1), and one end of the bushing (2) located inside the housing (1) is provided with a sealing end face (2.2), and the sealing end face (2.2) is in contact with the sealing shoulder (4.1); A driven member (5) fixedly arranged at the output end of the transmission shaft (4), and an elastic gasket (3) in a compressed state is arranged between the driven member (5) and the bushing (2).

2. The transmission structure capable of blocking the gas leakage path according to claim 1, wherein The bushing (2) is provided with a mounting groove body (2.1), and the elastic gasket (3) is arranged in the mounting groove body (2.1).

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

4. The transmission structure capable of blocking the gas leakage path according to claim 3, characterized in that, The mounting groove body (2.1) is annular, and the diameter of the mounting groove body (2.1) is larger than the outer diameter of the elastic gasket (3).

5. The transmission structure capable of blocking the gas leakage path according to any one of claims 1-4, characterized in that, An interference fit is formed between the bushing (2) and the mounting hole.

6. The transmission structure capable of blocking the gas leakage path according to any one of claims 1-4, characterized in that, 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.

7. The transmission structure capable of blocking the gas leakage path according to any one of claims 1-4, characterized in that, The elastic gasket (3) is an elastic material resistant to high temperatures above 800 degrees, or a composite material of metal and rubber.

Images