Sealing structure of built-in gas circuit of shell

Abstract

The invention relates to a positioning pin structure, in particular to a sealing structure of a built-in gas circuit of a shell, and solves the technical problem that the built-in gas circuit is easy to leak gas in the use, maintenance and disassembly processes of the existing sealing scheme of the built-in gas circuit of the shell. The sealing structure of the shell built-in gas circuit comprises a sealing gasket, a positioning sealing assembly and N sealing pieces which are arranged between an upper shell and a lower shell. A first airflow channel is arranged in the upper shell, and one end of the first airflow channel is used for being connected with an external air source; a second airflow channel is arranged in the lower shell, and one end of the second airflow channel is used for being connected with a gearbox shell; the other end of the second airflow channel is opposite to the other end of the first airflow channel, and is used for communicating the first airflow channel with the second airflow channel; the N sealing pieces are all of an annular structure, are arranged on the positioning sealing assembly in a sleeving mode, are located between the positioning sealing assembly and the upper shell or / and the lower shell and are used for sealing the shell built-in air paths of the upper shell and the lower shell.

Description

Technical Field

[0001] The present invention relates to a positioning pin structure, and more particularly to a sealing structure for an internal air path in a housing. Background Art

[0002] In existing integrated Automated Manual Transmission (AMT) shift actuators or clutch actuators, they are pushed by high-pressure air of 0.8 MPa. The high-pressure air flows through the air ducts in the housing, forming an internal air path structure in the housing. The advantages of this structure are that the overall transmission is aesthetically pleasing, the air supply is stable, the risk of air leakage is low, the air path is less affected by the external environment, and the risk of external force damage is low. In the trend of continuously demanding integration, the solution of an internal air path in the housing is a trend.

[0003] Existing internal air paths in the housing include an intake pipe of the intake housing and an outlet pipe of the outlet housing. The sealing ports of the air path pipes of the two housings are docked through a sealing gasket, and the upper housing and the lower housing are clamped by bolts to achieve sealing. However, this solution has the following risks, which may cause air leakage in the sealing area:

[0004] (1) During the use of the upper housing and the lower housing, they are frequently disassembled. Improper or incomplete assembly during disassembly may cause air leakage in the sealing area;

[0005] (2) During the disassembly of the upper housing and the lower housing, the sealing gasket is damaged, resulting in air leakage;

[0006] (3) After long-term use, the sealing gasket ages, resulting in air leakage.

[0007] Chinese Patent CN209459837U discloses "a spring pin positioning structure with self-detection", which includes a front mounting seat, a positioning pin, a spring and a rear mounting seat. A central hole and an airtight detection air path are provided on the front mounting seat. The central hole is a through hole. The positioning pin is in a T shape with a bottom cross-section larger than the upper cross-section. The middle part of the positioning pin is slidably installed up and down in the central hole. The airtight detection air path is an L-shaped passage, one end of which is connected to a sensor and the other end is an opening; when the positioning pin moves up, the opening is closed by the positioning pin, and when the positioning pin moves down, the opening is opened; a central groove is provided on the rear mounting seat, the spring is installed in the central groove, the rear mounting seat and the bottom of the positioning pin are connected up and down through the spring, and an exhaust hole communicating with the central groove is provided on the side wall of the rear mounting seat. The accuracy of the positioning pin can be improved through the self-detection function.

[0008] Chinese Patent CN219914520U discloses a "Transmission Housing Oil Passage Flow Detection Device", which includes a workbench. A positioning device, a feeding device, and a sealing device are arranged on the workbench. The positioning device includes a lower positioning component and an upper positioning component. The lower positioning component includes a positioning plate, on which a positioning block and a positioning pin are arranged. The upper positioning component includes a lifting cylinder, and a lifting plate is arranged at the output end of the lifting cylinder. A pressing plate is arranged on the lifting plate. The feeding device is connected to the lower positioning component. The sealing device includes a side sealing component and a bottom sealing component. The side sealing component is arranged along the circumferential direction of the positioning device, and the bottom sealing component is arranged below the lower positioning component. Among them, air passage channels are opened on both the side sealing component and the bottom sealing component. This solution realizes the blocking of the oil passage holes of parts through automatic feeding, different blocking structures, and the positioning structure fixes the parts, not only realizing the automation of the entire detection process, but also ensuring the sealing effect and improving the detection accuracy. However, the positioning pin structure and the sealing structure in the above solution cannot solve the problem that the built-in air passage in the existing housing is prone to air leakage during use, maintenance, and disassembly. Summary of the Invention

[0009] The object of the present invention is to solve the technical problem that the built-in air passage in the existing housing is prone to air leakage during use, maintenance, and disassembly, and provides a sealing structure for the built-in air passage in the housing.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A sealing structure for a built-in air passage in a housing, characterized in that it includes a gasket, a positioning and sealing component, and N sealing members arranged between the upper housing and the lower housing, where N≥3;

[0012] A first air flow channel is arranged in the upper housing, and one end of the first air flow channel is used to connect to an external air source;

[0013] A second air flow channel is arranged in the lower housing, and one end of the second air flow channel is used to connect to the transmission housing; the other end of the second air flow channel is arranged opposite to the other end of the first air flow channel for connecting the first air flow channel and the second air flow channel;

[0014] A through hole adapted to the positioning and sealing component is arranged on the gasket;

[0015] The upper end of the positioning and sealing component is arranged at the other end of the first air flow channel, and the lower end passes through the through hole and is arranged at the other end of the second air flow channel. And a third air flow channel is arranged axially in the positioning and sealing component for connecting the first air flow channel and the second air flow channel;

[0016] The N seals are all annular structures, respectively sleeved on the positioning and sealing assembly, and located between the positioning and sealing assembly and the upper shell or / and the lower shell, for sealing the built-in gas path in the shell of the upper shell and the lower shell.

[0017] Further, the positioning and sealing assembly includes a first connection section, a second connection section, and a third connection section that are connected in sequence from top to bottom; a first through hole is provided in the first connection section; a second through hole communicating with the first through hole is provided in the second connection section, and N annular mounting grooves adapted to the N seals are provided on its outer wall; the N seals are respectively arranged in the N annular mounting grooves; a third through hole communicating with the second through hole is provided in the third connection section, and an external thread is provided on its outer wall; an internal thread matching the external thread is provided on the inner wall of the second air flow channel for installing the third connection section; the first through hole, the second through hole, and the third through hole form the third air flow channel.

[0018] Further, the first through hole is a stepped hole, the inner part of its large end is set as an internal hexagonal hole, and the small end is provided with a mounting through hole.

[0019] Further, the inner diameters of the mounting through hole, the second through hole, and the third through hole are the same.

[0020] Further, there is a clearance fit between the first connection section and the upper shell; there is an interference fit between the N seals and the N annular mounting grooves and the upper shell respectively.

[0021] Further, both the first air flow channel and the second air flow channel are L-shaped structures.

[0022] Further, N = 3.

[0023] Further, the materials of the N seals are all rubber.

[0024] Advantages of the present invention:

[0025] 1. For the sealing structure of the built-in gas path in the shell of the present invention, a multi-channel sealing structure is formed between the upper shell and the lower shell by using the positioning and sealing assembly and N seals. As long as any one of the seals is intact, it can ensure that the structure will not leak air. Even in the case of frequent disassembly and seal aging in the later stage, the reliability of the sealing of the built-in gas path in the shell can be greatly improved.

[0026] 2. For the sealing structure of the built-in gas path in the shell of the present invention, the positioning and sealing assembly can play a role in positioning the upper shell and the lower shell during installation, making the installation more convenient.

[0027] 3. The sealing structure of the built-in air path in the housing of the present invention. The N sealing members play a role in sealing the built-in air path in the housing, avoiding the problem of air leakage in the sealing area caused by frequent disassembly, non-standard disassembly, and incomplete disassembly of the upper housing and the lower housing during use, and improving the reliability of sealing.

[0028] 4. The sealing structure of the built-in air path in the housing of the present invention. The first through hole is a stepped hole, and the inner part of its large end is set as an internal hexagonal hole, which is convenient for installation and disassembly.

[0029] 5. The sealing structure of the built-in air path in the housing of the present invention. The inner diameters of the installation through hole, the second through hole, and the third through hole are the same. It not only conducts the air flow between the upper housing and the lower housing, but also can reduce the flow resistance.

[0030] 6. The sealing structure of the built-in air path in the housing of the present invention. The first connection section and the upper housing are in clearance fit, and the third connection section and the lower housing are in threaded connection, making the installation or disassembly more convenient. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of an embodiment of the sealing structure of the built-in air path in the housing of the present invention;

[0032] Figure 2 is a schematic structural diagram of the positioning and sealing assembly in the embodiment of the sealing structure of the built-in air path in the housing of the present invention.

[0033] Description of the Reference Numerals:

[0034] 1 - Upper housing, 11 - First air flow channel, 2 - Lower housing, 21 - Second air flow channel, 3 - Sealing gasket, 4 - Positioning and sealing assembly, 41 - Third air flow channel, 42 - First connection section, 43 - Second connection section, 44 - Third connection section, 45 - First through hole, 46 - Second through hole, 47 - Annular installation groove, 48 - Third through hole, 5 - Sealing member. Detailed Embodiment

[0035] As Figure 1As shown in the figure, a sealing structure with an internal air passage in a housing includes an upper housing 1, a lower housing 2, a gasket 3 disposed between the upper housing 1 and the lower housing 2, a positioning and sealing assembly 4, and three seals 5. A first air passage 11 is provided in the upper housing 1, and one end of the first air passage 11 is used to connect to an external air source. A second air passage 21 is provided in the lower housing 2, and one end of the second air passage 21 is used to connect to the housing of a gearbox. A through hole adapted to the positioning and sealing assembly 4 is provided on the gasket 3. The upper end of the positioning and sealing assembly 4 is disposed at the other end of the first air passage 11, and the lower end passes through the through hole and is disposed at the other end of the second air passage 21. A third air passage 41 is axially provided in the positioning and sealing assembly 4 for connecting the first air passage 11 and the second air passage 21. The three seals 5 are all annular structures, respectively sleeved on the positioning and sealing assembly 4, and located between the positioning and sealing assembly 4 and the upper housing 1 or / and the lower housing 2 for sealing the internal air passage of the upper housing 1 and the lower housing 2.

[0036] As Figure 2 As shown in the figure, the positioning and sealing assembly 4 includes a first connection section 42, a second connection section 43, and a third connection section 44 that are sequentially connected from top to bottom. A first through hole 45 is provided in the first connection section 42. A second through hole 46 communicating with the first through hole 45 is provided in the second connection section 43, and three annular mounting grooves 47 adapted to the three seals 5 are provided on its outer wall. The three seals 5 are respectively disposed in the three annular mounting grooves 47. A third through hole 48 communicating with the first through hole 45 is provided in the third connection section 44, and an external thread is provided on its outer wall. An internal thread matching the external thread is provided on the inner wall of the second air passage 21 for mounting the third connection section 44. The first through hole 45, the second through hole 46, and the third through hole 48 form the third air passage 41. The first through hole 45 is a stepped hole, the inner part of its large end is set as an internal hexagonal hole for easy installation and disassembly, and a mounting through hole is provided at the small end. The inner diameters of the mounting through hole, the second through hole 46, and the third through hole 48 are the same.

[0037] Preferably, a clearance fit is provided between the first connection section 42 and the upper housing 1; a tight fit is provided between the three seals 5 and the three annular mounting grooves 47 and the upper housing 1 respectively; a threaded connection is provided between the third connection section 44 and the lower housing 2. Both the first air passage 11 and the second air passage 21 are L-shaped structures, and the materials of the three seals 5 are all rubber.

[0038] In the sealed structure of the built-in gas path inside the housing of the present invention, the positioning and sealing assembly 4 has the following functions: First, it can position the upper housing 1 and the lower housing 2. After positioning the positions of the upper housing 1 and the lower housing 2, it is convenient for installation, and it can be tightened by screws. Second, the positioning and sealing assembly 4 can seal the built-in gas paths of the upper housing 1 and the lower housing 2. The positioning and sealing assembly 4 is connected to the lower housing 2 through threads and is tightened by an internal hexagonal wrench. When the upper housing 1 and the lower housing 2 are connected, they are sequentially sealed 4 times through 3 seals 5 and a gasket 3. Among these 4 seals, as long as one seal line is intact, it can ensure that the structure does not leak air, and it can greatly improve the reliability of the sealed built-in gas path inside the housing even in the case of frequent disassembly and aging of the seal 5 in the later stage. Third, it can conduct air flow. The inside of the positioning and sealing assembly 4 is the third air flow channel 41, which conducts the air flow between the upper housing 1 and the lower housing 2. Fourth, it can be used as a general component in the sealed structures of other built-in gas paths inside the housing. Especially in the built-in gas path of the housing of the AMT transmission, this structure can be widely used, improving the versatility of the components.

[0039] The assembly process of the above-mentioned sealed structure of the built-in gas path inside the housing is specifically as follows:

[0040] First, the 3 seals 5 are sleeved in the 3 annular mounting grooves 47 of the positioning and sealing assembly 4. Second, the positioning and sealing assembly 4 is threadedly connected to the lower housing 2 through an internal hexagonal wrench. Then, during the process of connecting the upper housing 1, by using the positioning function of the positioning and sealing assembly 4, after positioning the first air flow channel 11 provided in the upper housing 1 and the second air flow channel 21 provided in the lower housing 2, the upper housing 1 and the lower housing 2 are tightly connected by bolts.

[0041] In the sealed structure of the built-in gas path inside the housing of the present invention, 3 seals 5 are sleeved on the positioning and sealing assembly 4. The 3 seals 5 and the gasket 3 form four-layer sealing protection between the upper housing 1 and the lower housing 2, so that the high-pressure gas flows from one end of the first air flow channel 11, forms the third air flow channel 41 through the first through hole 45, the second through hole 46 and the third through hole 48 in the positioning and sealing assembly 4, and flows out from the second air flow channel 21, greatly improving the reliability of the seal. The sealed structure of the built-in gas path inside the housing can also be extended to other structures, which can not only seal gases but also seal liquids.

Claims

1. A sealing structure of a gas path built into a housing, characterized in that: It comprises a sealing gasket (3) arranged between an upper shell (1) and a lower shell (2), a positioning sealing assembly (4), and N sealing members (5), where N is greater than or equal to 3; A first air flow channel (11) is provided in the upper shell (1), and one end of the first air flow channel (11) is used to be connected to an external air source; A second air flow channel (21) is provided in the lower housing (2), one end of the second air flow channel (21) being used for connecting to the gearbox housing; the other end of the second air flow channel (21) is arranged opposite to the other end of the first air flow channel (11), and is used for connecting the first air flow channel (11) and the second air flow channel (21); The sealing pad (3) is provided with a through hole adapted to the positioning sealing component (4); The upper end of the positioning seal assembly (4) is arranged at the other end of the first airflow channel (11), and the lower end passes through the through hole and is arranged at the other end of the second airflow channel (21), and a third airflow channel (41) is axially arranged in the positioning seal assembly (4) for communicating with the first airflow channel (11) and the second airflow channel (21); The N sealing members (5) are all annular structures, are respectively sleeved on the positioning sealing assembly (4), and are located between the positioning sealing assembly (4) and the upper shell (1) or / and the lower shell (2), and are used to seal the internal gas path of the upper shell (1) and the lower shell (2).

2. A sealing structure for a gas path built into a housing according to claim 1, characterized in that: The positioning sealing assembly (4) comprises a first connecting section (42), a second connecting section (43) and a third connecting section (44) which are sequentially connected from top to bottom; A first through hole (45) is provided in the first connecting section (42); The second connecting section (43) is provided with a second through hole (46) communicating with the first through hole (45), and its outer wall is provided with N annular mounting grooves (47) adapted to the N sealing members (5); the N sealing members (5) are respectively arranged in the N annular mounting grooves (47); The third connecting section (44) is provided with a third through hole (48) communicating with the second through hole (46), and an outer wall of the third through hole (48) is provided with an external thread; the inner wall of the second air flow channel (21) is provided with an internal thread matching the external thread, for installing the third connecting section (44); The first through hole (45), the second through hole (46) and the third through hole (48) form the third air flow channel (41).

3. A sealing structure for a gas path built into a housing according to claim 2, characterized in that: The first through hole (45) is a stepped hole, the interior of the large end of which is arranged as an inner hexagonal hole, and the small end of which is arranged with a mounting through hole and communicates with the second through hole (46).

4. A sealing structure for a gas path built into a housing according to claim 3, characterized in that: The inner diameters of the mounting through hole, the second through hole (46), and the third through hole (48) are the same.

5. A sealing structure for a gas path built into a housing according to claim 4, characterized in that: There is a clearance fit between the first connecting section (42) and the upper shell (1); The N sealing members (5) are respectively tightly fitted with the N annular mounting grooves (47) and the upper shell (1).

6. A sealing structure for a gas path built into a housing according to claim 5, characterized in that: The first air flow channel (11) and the second air flow channel (21) are both L-shaped structures.

7. A sealing structure for a gas path built into a housing according to claim 6, characterized in that: Said N=3.

8. A sealing structure for a gas path built into a housing according to claim 6, characterized in that: The material of the N sealing elements (5) is all rubber.

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