Ventilation system of transmission

Abstract

A transmission ventilation system belongs to the technical field of transmissions, the tail end of an exhaust passage is hidden in a front shell, a double-layer oil retaining structure is integrated on a gear shifting control mechanism, a condensation backflow path is additionally arranged outside, and the transmission ventilation system is excellent in the aspects of oil leakage prevention, water inflow prevention and oil sludge adhesion prevention. Comprising a ventilation system A and a gear shifting control mechanism. The ventilation system A is arranged on the gear shifting control mechanism, and after the gear shifting control mechanism is fixed to a middle shell of the transmission, the ventilation system A is located at the highest point of the transmission. The ventilation system is integrated on the transmission gear shifting control mechanism, the tail end of the exhaust channel is ingeniously hidden in the front shell, the phenomenon that oil sludge adheres to the periphery of the ventilation system after a vehicle travels for a long distance is fundamentally avoided, and meanwhile when the vehicle travels in a wading mode, the ventilation system is not prone to falling off. In addition, a double-layer oil blocking structure is designed according to the sharing principle, the leakage-proof capacity is high, the number of parts is small, and the cost advantage is obvious.

Description

Technical Field

[0001] The invention belongs to the technical field of transmissions, and in particular relates to a transmission ventilation system. Background Art

[0002] When the vehicle is running, the gears inside the transmission run at high speed, the lubricating oil splashes violently, the temperature inside the transmission rises sharply in a short period of time, the pressure increases, and the gas expands due to the heat and needs to be discharged through the ventilation system.

[0003] The ventilation system is the only channel connecting the inside of the transmission with the outside world, which requires that the ventilation system not only meet the exhaust needs but also have the ability to prevent oil leakage and water ingress.

[0004] The current transmission ventilation system mostly uses a single ventilation valve and is arranged on the surface of the transmission housing. It has average oil leakage prevention capabilities. At the same time, when high-temperature oil and gas are discharged through the ventilation holes and come into contact with dust in the atmosphere, sludge is easily formed around the ventilation valve, causing poor appearance of the transmission and easily causing customer complaints. In addition, when the vehicle is wading, splashed water droplets may enter the transmission through the ventilation holes, causing oil emulsification and affecting reliability. Summary of the invention

[0005] In order to solve the problems in the background technology, the present invention further provides a transmission ventilation system, which hides the end of the exhaust channel inside the front shell, integrates a double-layer oil baffle structure on the shift operating mechanism, adds a condensation reflux path on the outside, and performs excellently in preventing oil leakage, water ingress, and sludge adhesion.

[0006] The technical solution adopted by the present invention is:

[0007] A transmission ventilation system comprises a ventilation system A and a shift operating mechanism; the ventilation system A is arranged on the shift operating mechanism, and after the shift operating mechanism is fixed to a middle housing of the transmission, the ventilation system A is at the highest point of the transmission.

[0008] Furthermore, the gear shift operating mechanism includes a support plate, a primary oil baffle structure, a gear selection housing, a secondary oil baffle plate mounting seat, a secondary oil baffle plate and an oil leakage structure; the support plate is integrated with the primary oil baffle structure, and the support plate is fixed on the gear selection housing, and a secondary oil baffle plate mounting seat is integrated inside the gear selection housing, one end of the secondary oil baffle plate is limited by the secondary oil baffle plate mounting seat, and the other end is fixed on the secondary oil baffle plate mounting seat, and the lower right corner of the secondary oil baffle plate is open, which is an oil leakage structure.

[0009] Furthermore, the primary oil retaining structure is arranged at the upper right portion of the support plate.

[0010] Furthermore, a limiting groove is provided on the secondary oil baffle plate mounting seat, and a limiting plug-in portion is provided at one end of the secondary oil baffle plate, and the limiting plug-in portion is connected with the limiting groove to realize the limiting of the secondary oil baffle plate by the secondary oil baffle plate mounting seat.

[0011] Furthermore, the primary oil baffle structure is integrally stamped and formed with the support plate, and the secondary oil baffle plate mounting seat is integrally cast and formed with the gear selection housing.

[0012] Furthermore, the ventilation system A includes a front ventilation nozzle and a multi-step undercut, a ventilation hose, a rear ventilation nozzle and a multi-step undercut; the front ventilation nozzle is pressed into the gear selection housing by interference fit, the front end of the ventilation hose is connected to the front ventilation nozzle through the multi-step undercut A, the ventilation hose is designed to conform to the front housing of the transmission and is close to the front housing, the rear end of the ventilation hose is connected to the rear ventilation nozzle through the multi-step undercut B, and the rear ventilation nozzle is pressed into the front housing by interference fit.

[0013] Furthermore, after the ventilation hose is projected on the XY plane, the angle β between the ventilation hose and the X direction is 125°±5°.

[0014] Furthermore, the front shell is cast with an exhaust and water-proof maze, which adopts a two-stage structure. After projection on the XY plane, the angles γ and θ with the X direction are 165°~170° and 130°~135° respectively, and a drain trough is designed inside the front shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The ventilation system of the present invention is integrated on the transmission shift operating mechanism, and the end of the exhaust passage is cleverly hidden inside the front shell body, which fundamentally solves the problem of oil sludge adhesion around the ventilation system after the vehicle has traveled a long mileage. At the same time, when the vehicle is traveling through water, it can effectively prevent splashing water droplets from entering the transmission through the ventilation system. In addition, the double-layer oil baffle structure is designed according to the principle of sharing, with strong leakage prevention ability, a small number of parts and components, and obvious cost advantages.

[0017] The parts of the present invention are highly integrated, compact in structure, do not occupy additional cabin space, have wider adaptability, and are simple and convenient to install.

[0018] The ventilation system of the present invention has a significant effect in preventing oil leakage and water ingress, and at the same time, it also significantly improves the problem of oil sludge adhesion around the ventilation valve after the vehicle has been running for a long time. The ventilation system is arranged on the shift control mechanism, with few special parts, high integration, wide adaptability, and simple and convenient installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2is a schematic diagram of the shift control mechanism of the present invention;

[0021] Figure 3 is a schematic diagram of a support plate of the present invention;

[0022] Figure 4 It is a schematic diagram of the installation of the support plate of the present invention;

[0023] Figure 5 is a schematic diagram of the interior of the support plate of the present invention;

[0024] Figure 6 It is a schematic diagram of the secondary oil baffle of the present invention;

[0025] Figure 7 It is a schematic diagram of the secondary oil baffle mounting seat of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the ventilation system A of the present invention;

[0027] Fig. 9 This is a schematic diagram of the installation of the ventilation rear nozzle of the present invention;

[0028] Fig.10 This is a schematic diagram of the installation of the ventilation rear nozzle of the present invention;

[0029] Fig.11 Schematic diagram of the exhaust and water ingress prevention maze of the present invention;

[0030] Among them: 1. Middle housing; 2. Shift operating mechanism; 3. Support plate; 4. Primary oil baffle structure; 5. Shift selection housing; 6. Secondary oil baffle mounting seat; 7. Secondary oil baffle; 8. Oil drain structure; 9. Front ventilation nozzle; 10. Multi-step inverted buckle A; 11. Ventilation hose; 12. Rear ventilation nozzle; 13. Multi-step inverted buckle B; 14. Front housing; 15. Exhaust anti-water ingress maze; 16. Drain trough. DETAILED DESCRIPTION

[0031] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0032] like Figure 1 As shown, the present invention provides a transmission ventilation system, including a ventilation system A and a shift operating mechanism 2; the ventilation system A is arranged on the shift operating mechanism 2, and after the shift operating mechanism 2 is fixed to the middle housing 1 of the transmission by three bolts, the ventilation system A is at the highest point of the transmission.

[0033] like Figure 2 , Figure 3 As shown, the shift operating mechanism 2 includes a support plate 3, a primary oil baffle structure 4, a gear selection housing 5, a secondary oil baffle mounting seat 6, a secondary oil baffle 7 and an oil drain structure 8;

[0034] The support plate 3 is integrated with a primary oil retaining structure 4, which is integrally stamped with the support plate 3, with a small stamping area, and the support plate 3 is fixed to the gear selection housing 5 by means of mounting bolts. The primary oil retaining structure 4 is designed by using existing parts of the gear shifting mechanism 2, without any additional cost increase.

[0035] like Figure 4 As shown, after the support plate 3 and the gear selection housing 5 are matched, taking the oil return performance into consideration, the first-level oil blocking structure 4 is set at the upper right part of the support plate 3, and only blocks the upper right third of the support plate 3. The support plate 3 and the lower part of the gear selection housing 5 are not blocked, which is conducive to the return of oil splashed into the gear selection housing 5.

[0036] like Figure 5 , Figure 6 , Figure 7 As shown, a secondary oil baffle plate mounting seat 6 is integrated inside the gear selection housing 5, and the secondary oil baffle plate mounting seat 6 is integrally cast with the gear selection housing 5. One end of the secondary oil baffle plate 7 is limited by the secondary oil baffle plate mounting seat 6, and the other end only needs one bolt to fix on the secondary oil baffle plate mounting seat 6. The local opening at the lower right side of the secondary oil baffle plate 7 is enlarged to form an oil leakage structure 8, which can effectively prevent the oil splashed inside the transmission from entering the ventilation system after passing through the primary oil baffle structure 4 and the secondary oil baffle plate 7.

[0037] like Figure 6 , Figure 7 As shown, a limiting groove is provided on the secondary oil baffle plate mounting seat 6, and a limiting plug-in portion is provided at one end of the secondary oil baffle plate 7. The limiting plug-in portion and the limiting groove are connected to realize the limiting of the secondary oil baffle plate 7 by the secondary oil baffle plate mounting seat 6.

[0038] The ventilation system A includes a ventilation front nozzle 9 and a multi-step undercut A10, a ventilation hose 11, a ventilation rear nozzle 12 and a multi-step undercut B13;

[0039] like Figure 8 As shown, the front vent nozzle 9 is pressed into the gear selection housing 5 by interference fit, and the front end of the vent hose 11 is connected to the front vent nozzle 9 through a multi-step undercut A10, eliminating the hoop commonly used in traditional pipe fixing, reducing the number of parts and reducing costs. After the vent hose 11 is projected on the XY plane, the angle β with the X direction is 125°±5°, which is conducive to the oil and gas condensing and flowing back along the pipe wall into the transmission. The vent hose 11 has no special bends and is designed to conform to the front housing 14 of the transmission and is close to the front housing 14, as shown in FIG. Fig. 9 As shown, no additional cabin space is occupied, and the adaptability is wider. The rear end of the ventilation hose 11 is also connected to the ventilation rear nozzle 12 through a multi-step step buckle B13, eliminating the hoop commonly used in traditional pipeline fixing.

[0040] like Fig. 9As shown, the ventilation rear nozzle 12 is pressed into the front housing 14 by interference fit, and the end of the ventilation system A is implanted inside the front housing 14 and is no longer exposed to the atmosphere, thereby avoiding contact with dust in the atmosphere. Therefore, there will be no oil sludge attached to the surface of the housing. At the same time, it can also effectively prevent splashing water droplets from entering the transmission through the ventilation system when the vehicle is wading.

[0041] like Fig.10 , Fig.11 As shown, the front housing 14 is cast with an exhaust water ingress prevention labyrinth 15, which adopts a two-stage structure. After projection on the XY plane, the angles γ and θ with the X direction are 165° to 170° and 130° to 135° respectively. Considering that when the vehicle is wading, under certain extreme conditions, there may still be a possibility that splashing water droplets enter the exhaust water ingress prevention labyrinth 15, a drain groove 16 is designed inside the front housing 14, which is conducive to the timely discharge of water droplets entering the exhaust water ingress prevention labyrinth 15, and prevents water from entering the transmission through the ventilation system.

[0042] In summary, the transmission ventilation system structure and layout provided by the present invention have significant effects in preventing oil leakage and water ingress, and at the same time, can solve the problem of sludge adhesion around the ventilation valve after the vehicle has been running for a long time. The ventilation system disclosed by the present invention has a compact structure, high parts integration, simple and convenient installation, and can be adapted to a variety of models.

[0043] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A transmission ventilation system, characterized in that: It comprises a ventilation system A and a gear shift operating mechanism (2); the ventilation system A is arranged on the gear shift operating mechanism (2); after the gear shift operating mechanism (2) is fixed to a middle housing (1) of the transmission, the ventilation system A is located at the highest point of the transmission.

2. A transmission ventilation system according to claim 1, characterized in that: The gear shift operating mechanism (2) comprises a support plate (3), a primary oil baffle structure (4), a gear selection housing (5), a secondary oil baffle mounting seat (6), a secondary oil baffle (7) and an oil drain structure (8); The support plate (3) is integrated with a primary oil baffle structure (4), and the support plate (3) is fixed on a gear selection housing (5). A secondary oil baffle mounting seat (6) is integrated inside the gear selection housing (5). One end of the secondary oil baffle (7) is limited by the secondary oil baffle mounting seat (6), and the other end is fixed on the secondary oil baffle mounting seat (6). The secondary oil baffle (7) has an opening at the lower right corner, which is an oil drain structure (8).

3. A transmission ventilation system according to claim 2, characterized in that: The primary oil retaining structure (4) is arranged at the upper right portion of the support plate (3).

4. A transmission ventilation system according to claim 2, characterized in that: A limiting groove is provided on the secondary oil baffle plate mounting seat (6), and a limiting plug-in portion is provided at one end of the secondary oil baffle plate (7). The limiting plug-in portion and the limiting groove are plugged into each other to limit the position of the secondary oil baffle plate (7) by the secondary oil baffle plate mounting seat (6).

5. A transmission ventilation system according to claim 2, characterized in that: The primary oil baffle structure (4) is integrally stamped and formed with the support plate (3), and the secondary oil baffle plate mounting seat (6) is integrally cast and formed with the gear selection housing (5).

6. A transmission ventilation system according to claim 2, characterized in that: The ventilation system A comprises a ventilation front nozzle (9) and a multi-step stepped undercut A (10), a ventilation hose (11), a ventilation rear nozzle (12) and a multi-step stepped undercut B (13); The front ventilation nozzle (9) is pressed into the gear selection housing (5) by interference fit, the front end of the ventilation hose (11) is connected to the front ventilation nozzle (9) through a multi-step stepped undercut A (10), the ventilation hose (11) is designed to conform to the front housing (14) of the transmission and is close to the front housing (14), the rear end of the ventilation hose (11) is connected to the rear ventilation nozzle (12) through a multi-step stepped undercut B (13), and the rear ventilation nozzle (12) is pressed into the front housing (14) by interference fit.

7. A transmission ventilation system according to claim 6, characterized in that: After the ventilation hose (11) is projected on the XY plane, the angle β between the ventilation hose (11) and the X direction is 125°±5°.

8. A transmission ventilation system according to claim 6, characterized in that: The front housing (14) is cast with an exhaust and water ingress prevention labyrinth (15), which adopts a two-stage structure. After being projected on the XY plane, the angles γ and θ with the X direction are 165° to 170° and 130° to 135° respectively. A water drain groove (16) is designed inside the front housing (14).

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