Oil duct structure of vehicle transmission system

Abstract

The utility model relates to the technical field of hybrid power vehicles, in particular to an oil duct structure of a vehicle transmission system, the vehicle transmission system comprises a main shaft used for outputting power, the oil duct structure comprises a first high-pressure oil duct and a low-pressure oil duct which are isolated from each other, and axial sections of the first high-pressure oil duct and the low-pressure oil duct are respectively arranged in the main shaft. The oil duct is arranged by means of the internal space of the main shaft, so that the oil duct layout in the transmission system is simpler; the first high-pressure oil channel is used for allowing first high-pressure oil to pass through and be supplied to the first high-pressure oil component, the low-pressure oil channel is used for allowing low-pressure oil to pass through and be supplied to the low-pressure oil component, the first high-pressure oil channel is provided with a high-pressure radial section extending in the radial direction of the main shaft, and the low-pressure oil channel is provided with a low-pressure radial section extending in the radial direction of the main shaft. The high-pressure oil-using component and the low-pressure oil-using component are respectively arranged on the radial outer side of the main shaft, so that the hydraulic oil in the oil duct can be more efficiently conveyed to each oil-using component by means of rotating centrifugal force.

Description

Technical Field

[0001] This utility model relates to the field of hybrid vehicle technology, specifically to an oil passage structure for a vehicle transmission system. Background Technology

[0002] The powertrain of a hybrid vehicle transmits power from the engine and electric motor to the gearbox via a main shaft. This typically includes a wet clutch, which requires high-pressure hydraulic oil to operate. However, other moving parts in the powertrain (such as bearings) only require low-pressure hydraulic oil for lubrication. Therefore, at least two oil passages are needed in the powertrain. In existing technologies, the oil passage layout of the powertrain is not optimal, making it difficult to efficiently deliver hydraulic oil to the working parts (clutches, bearings, etc.), which is detrimental to the efficient transmission of power. Summary of the Invention

[0003] The purpose of this utility model is to provide an oil passage structure for a vehicle transmission system to solve the problem of the unreasonable oil passage layout in the transmission system mentioned above.

[0004] To achieve the above objectives, the technical solution of this utility model includes:

[0005] An oil passage structure for a vehicle transmission system includes a main shaft for outputting power. The oil passage structure includes a first high-pressure oil passage and a low-pressure oil passage isolated from each other. The first high-pressure oil passage includes a high-pressure axial section and a high-pressure radial section disposed on the main shaft. The first high-pressure oil passage is used to supply first high-pressure oil to a first high-pressure oil-using component of the vehicle transmission system by sequentially passing through the high-pressure axial section and the high-pressure radial section. The low-pressure oil passage includes a low-pressure axial section and a low-pressure radial section disposed on the main shaft. The low-pressure oil passage is used to supply low-pressure oil to a low-pressure oil-using component of the vehicle transmission system by sequentially passing through the low-pressure axial section and the low-pressure radial section. The high-pressure radial section and the low-pressure radial section extend radially along the main shaft, and the high-pressure oil-using component and the low-pressure oil-using component are respectively disposed radially outside the main shaft.

[0006] In one embodiment, the first high-pressure oil component includes a drive portion of a first clutch, and the first high-pressure oil passage is used to allow the first high-pressure oil to flow through it to drive the first clutch to engage.

[0007] In one embodiment, the first clutch is disposed inside a housing, and the opening of the housing is further provided with a cover. The first high-pressure oil passage is used to supply the first high-pressure oil to the drive part of the first clutch. The first high-pressure oil passage further includes a high-pressure oil inlet section. The beginning of the high-pressure oil inlet section is connected to a first high-pressure oil valve, and the end of the high-pressure oil inlet section is connected to the high-pressure axial section. A part of the high-pressure oil inlet section is disposed inside the cover, and the first high-pressure oil valve is installed in the housing.

[0008] In one embodiment, the oil passage structure further includes a second high-pressure oil passage isolated from the first high-pressure oil passage, the second high-pressure oil passage being used to supply second high-pressure oil to a second high-pressure oil component of the vehicle transmission system.

[0009] In one embodiment, the vehicle transmission system includes a second clutch, the first clutch and the second clutch are axially spaced along the main shaft, the second high-pressure oil component includes a drive portion of the second clutch, and the second high-pressure oil passage is used to supply the second high-pressure oil to drive the second clutch to engage transmission.

[0010] In one embodiment, the second clutch is closer to the cover body than the first clutch, the cover body is provided with a mounting portion protruding toward the interior of the housing, the drive portion of the second clutch is connected to the mounting portion in a relative rotational relationship, and a portion of the second high-pressure oil passage is disposed in the cover body and extends to the mounting portion.

[0011] In one embodiment, the low-pressure oil supply component includes a clutch reset portion and a moving part to be lubricated. The low-pressure oil passage is used to allow the low-pressure oil to flow through it to drive the clutch to disengage and lubricate the moving part to be lubricated. The moving part to be lubricated is one or more of a bearing, a clutch friction disc, and a transmission gear.

[0012] In one embodiment, the vehicle transmission system includes a housing and a cover, at least a portion of the low-pressure oil supply components are disposed within the housing, the low-pressure oil passage includes a low-pressure oil inlet section, the beginning of the low-pressure oil inlet section is connected to a cooling oil passage, the end of the low-pressure oil inlet section is connected to the low-pressure axial section, and a portion of the low-pressure oil inlet section is disposed within the cover.

[0013] In one embodiment, the low-pressure radial segment is provided in multiples and the multiple low-pressure radial segments are distributed at intervals along the axial direction of the main shaft, and the multiple low-pressure radial segments are respectively connected to the bearing, clutch friction disc, transmission gear and reset part of the wet clutch of the vehicle transmission system.

[0014] In one embodiment, one of the low-pressure radial sections is used to connect to a gearbox.

[0015] The beneficial effects of this utility model are as follows: First, the axial sections of the first high-pressure oil passage and the low-pressure oil passage are respectively arranged inside the main shaft, and the oil passages are arranged by utilizing the internal space of the main shaft, making the oil passage layout in the transmission system simpler. Second, all oil-using components (high-pressure oil-using components and low-pressure oil-using components) are arranged along the main shaft and located on the radial outer side of the main shaft, so the hydraulic oil in the oil passages can be delivered to each oil-using component more efficiently by means of rotational centrifugal force. Third, the axial sections of the oil passages (high-pressure axial section and low-pressure axial section) arranged along the main shaft are straighter, further promoting the efficient delivery of hydraulic oil. Finally, the high-pressure oil passage and the low-pressure oil passage are isolated from each other, which can provide hydraulic oil of corresponding pressure to each oil-using component, promoting the efficient transmission of the transmission system. Attached Figure Description

[0016] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0017] Figure 2 This is an exploded view of an embodiment of the present invention.

[0018] Figure 3 This is a right view of an embodiment of the present utility model.

[0019] Figure 4 yes Figure 3 AA sectional view.

[0020] Figure 5 yes Figure 4 Partial structural diagram.

[0021] Figure 6 This is a right sectional view of an embodiment of the present invention.

[0022] Figure 7 yes Figure 3 BB cross-sectional view.

[0023] Figure 8 yes Figure 3 CC section view.

[0024] The following are the labels in the diagram: C1 First Clutch, C2 Second Clutch, M Motor, 1 Housing, 2 Cover, 21 Mounting Part, 3 Main Shaft, 4 Planetary Gear System, 5 First High-Pressure Oil Passage, 51 High-Pressure Axial Section, 52 High-Pressure Radial Section, 53 High-Pressure Oil Inlet Section, 6 Second High-Pressure Oil Passage, 7 Low-Pressure Oil Passage, 71 Low-Pressure Axial Section, 72 Low-Pressure Radial Section, 73 Low-Pressure Oil Inlet Section, 81 First Pressure Plate, 82 First Drive Plate, 83 First Drive Chamber, 84 Clutch Support, 85 First Reset Chamber, 86 First Reset Spring, 91 Second Pressure Plate, 92 Second Drive Plate, 93 Second Drive Chamber, 94 Reset Plate, 95 Second Reset Chamber, 96 Second Reset Spring. Detailed Implementation

[0025] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0026] See Figures 1 to 4 As shown, this utility model discloses an oil passage structure for a vehicle transmission system. This vehicle transmission system is used in hybrid vehicles and outputs power from various power sources, such as engines and motors, individually or in combination, to the gearbox. It includes a housing 1, a cover 2, and a main shaft 3 for outputting power. One end of the main shaft 3 near the cover 2 extends into the gearbox to transmit power to it. Various transmission components are arranged radially outward from the main shaft 3. These transmission components require lubrication and cooling during transmission and are also oil-operated components. In this embodiment, the transmission components include a first clutch C1, a second clutch C2, the main shaft 3, and a planetary gear train 4. The first clutch C1, the second clutch C2, and the planetary gear train 4 are arranged axially spaced along the main shaft 3, and their axes of rotation coincide with the central axis of the main shaft 3.

[0027] See Figures 4 to 8As shown, the oil passage structure includes a first high-pressure oil passage 5, a second high-pressure oil passage 6, and a low-pressure oil passage 7, which are isolated from each other. The first high-pressure oil passage 5 includes a high-pressure axial section 51 and a high-pressure radial section 52 disposed on the main shaft 3. The first high-pressure oil passage 5 is used to supply first high-pressure oil to the first high-pressure oil-using component of the vehicle transmission system by passing through the high-pressure axial section 51 and the high-pressure radial section 52 in sequence. The second high-pressure oil passage 6 is used to supply second high-pressure oil to the second high-pressure oil-using component of the vehicle transmission system by passing through it. The low-pressure oil passage 7 includes a low-pressure axial section 71 and a low-pressure radial section 72 disposed on the main shaft 3. The low-pressure oil passage 7 is used to supply low-pressure oil to the low-pressure oil-using component of the vehicle transmission system by passing through the low-pressure axial section 71 and the low-pressure radial section 72 in sequence. The high-pressure radial section 52 and the low-pressure radial section 72 extend radially along the main shaft 3, and the high-pressure oil-using component and the low-pressure oil-using component are respectively disposed on the radially outer side of the main shaft 3.

[0028] The first high-pressure hydraulic component includes a drive section for the first clutch C1, and a first high-pressure oil passage 5 for supplying first high-pressure oil to drive the first clutch C1 into engagement. The second high-pressure hydraulic component includes a drive section for the second clutch C2, and a second high-pressure oil passage 6 for supplying second high-pressure oil to drive the second clutch C2 into engagement. In this embodiment, the first clutch C1 and the second clutch C2 are wet clutches, which are engaged or disengaged by hydraulic oil. The drive section of the first clutch C1 includes a first pressure plate 81 and a first drive plate 82, which are sealed together to form a first drive chamber 83. When the first high-pressure oil enters the first drive chamber 83, the first pressure plate 81 actuates to push the friction plate of the first clutch C1 into engagement, that is, the first clutch C1 locks into engagement. The driving part of the second clutch C2 includes a second pressure plate 91 and a second drive plate 92. The second pressure plate 91 and the second drive plate 92 are sealed together to form a second drive chamber 93. When the second high-pressure oil enters the second drive chamber 93, the second pressure plate 91 actuates and pushes the friction plate of the second clutch C2 to engage, that is, the second clutch C2 locks and forms an engagement transmission. In addition, the second drive plate 92 in this embodiment is also a bracket for the motor M. When the motor M rotates, the bracket rotates synchronously with the motor rotor.

[0029] The reset parts of both clutches are driven by low-pressure oil. The reset part of the clutch is used to drive the friction discs of the clutches to separate, thus disengaging the clutch transmission. In this embodiment, the reset part of the first clutch C1 includes a first pressure plate 81, a clutch support 84, and a first reset chamber 85 between them. A first reset spring 86 is provided in the first reset chamber 85. When low-pressure oil enters the first reset chamber 85 through the low-pressure axial section 71 and the low-pressure radial section 72, the first pressure plate 81 actuates under the hydraulic pressure of the low-pressure oil and the action of the first reset spring 86, causing the friction discs of the first clutch C1 to separate. The reset part of the second clutch C2 includes a second pressure plate 91, a reset plate 94, and a second reset chamber 95 between them. A second reset spring 96 is provided in the second reset chamber 95. When low-pressure oil enters the second reset chamber 95 through the low-pressure axial section 71 and the low-pressure radial section 72, the second drive plate 92 actuates under the hydraulic pressure of the low-pressure oil and the action of the second reset spring 96, causing the friction discs of the second clutch C1 to separate.

[0030] Because the first reset chamber 85 contains a first reset spring 86, when the first clutch C1 resets, the elastic force of the first reset spring 86 assists in driving the first pressure plate 81 with a relatively small amount of hydraulic pressure. However, when the first clutch C1 engages, it is necessary to overcome the elastic force of the first reset spring 86, requiring a larger amount of hydraulic pressure to drive the first pressure plate 81. Similarly, the second clutch C2 only requires a small amount of hydraulic pressure to reset, but a larger amount of hydraulic pressure is needed to engage. Therefore, the reset parts of the clutches (first clutch C1 and second clutch C2) are low-pressure hydraulic components.

[0031] The first clutch C1 is located inside the housing 1, and the cover 2 is located at the opening of the housing 1. The first high-pressure oil passage 5 is used to supply the first high-pressure oil to the drive part of the first clutch C1. The first high-pressure oil passage 5 also includes a high-pressure oil inlet section 53. The beginning of the high-pressure oil inlet section 53 is connected to the first high-pressure oil valve, and the end of the high-pressure oil inlet section 53 is connected to the high-pressure axial section 51. A part of the high-pressure oil inlet section 53 is located inside the cover 2. The first high-pressure oil valve is installed in the housing 1.

[0032] The second clutch C2 is closer to the cover than the first clutch C1. The cover 2 has a mounting portion 21 protruding towards the interior of the housing 1. The driving portion of the second clutch C2 is connected to the mounting portion 21 in a relative rotational relationship. A portion of the second high-pressure oil passage 6 is disposed inside the cover 2 and extends to the mounting portion 21. In this embodiment, the second clutch C2 is closer to the cover 2 than the first clutch C1. Therefore, using the cover 2 to arrange a portion of the second high-pressure oil passage 6 can make full use of the internal structure of the cover 2, making the second high-pressure oil passage 6 simpler and the transmission of the second high-pressure oil more efficient. The main shaft 3 is disposed inside the annular mounting portion 21. The high-pressure oil inlet section 53 of the first high-pressure oil passage 5 extends from the interior of the cover 2 to the interior of the mounting portion 21, and then connects to the high-pressure axial section 51.

[0033] The second high-pressure oil passage 6 is also connected to the second high-pressure oil valve. The first high-pressure oil valve and the second high-pressure oil valve are independent of each other, separating the on-off control of the hydraulic oil in the first high-pressure oil passage 5 and the second high-pressure oil passage 6, thereby facilitating the engagement or disengagement of the first clutch C1 and the second clutch C2 respectively.

[0034] In addition to the clutch reset section mentioned above, the low-pressure oil supply components also include moving parts to be lubricated. Low-pressure oil flows through the low-pressure oil passage 7 to lubricate the moving parts to be lubricated. The moving parts to be lubricated are one or more of bearings, clutch friction discs, and transmission gears. More specifically, in this embodiment, the moving parts to be lubricated include bearings, the two clutch friction discs, each transmission gear of the planetary gear train 4, and each transmission gear in the reduction gearbox. Multiple low-pressure radial sections 72 are provided, and these multiple low-pressure radial sections 72 are spaced apart along the axial direction of the main shaft 3. These multiple low-pressure radial sections 72 are respectively connected to the bearings, clutch friction discs, transmission gears of the planetary gear train 4, and the reset sections of the two clutches in the vehicle transmission system. Furthermore, one low-pressure radial section 72 connects to the outside of the housing 1 to enter the gearbox and lubricate the gears inside the gearbox.

[0035] The low-pressure oil passage 7 includes a low-pressure oil inlet section 73. The beginning of the low-pressure oil inlet section 73 is connected to the cooling oil circuit, and the end of the low-pressure oil inlet section 73 is connected to the low-pressure axial section 71. A portion of the low-pressure oil inlet section 73 is disposed within the cover 2. Except for the gearbox, all other low-pressure oil-using components are disposed within the housing 1. In this embodiment, utilizing the cover 2 to house a portion of the low-pressure oil inlet section 73 reduces the number of oil pipes. Since there are a large number of low-pressure oil-using components, the low-pressure oil inlet section 73 connects to the cooling oil circuit, and the low-pressure oil serves to cool and lubricate the low-pressure oil-using components and the motor M.

[0036] This invention separates the high-pressure oil passages and low-pressure oil passages. For a large number of low-pressure oil-using components, a unified connection is made to the cooling oil circuit, using low-pressure oil for cooling and lubrication. For a smaller number of high-pressure oil-using components requiring higher hydraulic pressure, a separate high-pressure oil passage is used, connected to the high-pressure oil pump, facilitating precise and efficient control of the clutch operation. In other embodiments, the high-pressure oil-using components may include not only the clutch drive unit but also high-pressure bearings.

[0037] Both the first high-pressure oil supply component and the low-pressure oil supply component are arranged along the main shaft 3 and located on the radial outside of the main shaft 3. Therefore, the hydraulic oil in each oil passage can be delivered to each oil supply component more efficiently by means of the rotational centrifugal force.

[0038] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that all changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. An oil passage structure for a vehicle transmission system, the vehicle transmission system including a main shaft for outputting power, characterized in that: The oil passage structure includes a first high-pressure oil passage and a low-pressure oil passage that are isolated from each other. The first high-pressure oil passage includes a high-pressure axial section and a high-pressure radial section disposed on the main shaft. The first high-pressure oil passage is used to supply first high-pressure oil to a first high-pressure oil-using component of the vehicle transmission system by sequentially passing through the high-pressure axial section and the high-pressure radial section. The low-pressure oil passage includes a low-pressure axial section and a low-pressure radial section disposed on the main shaft. The low-pressure oil passage is used to supply low-pressure oil to a low-pressure oil-using component of the vehicle transmission system by sequentially passing through the low-pressure axial section and the low-pressure radial section. The high-pressure radial section and the low-pressure radial section extend radially along the main shaft, and the high-pressure oil-using component and the low-pressure oil-using component are respectively disposed radially outside the main shaft.

2. The oil passage structure of a vehicle transmission system according to claim 1, characterized in that: The first high-pressure oil component includes a drive portion of the first clutch, and the first high-pressure oil passage is used to supply the first high-pressure oil to drive the first clutch to engage and transmit power.

3. The oil passage structure of a vehicle transmission system according to claim 2, characterized in that: The first clutch is disposed inside a housing, and the opening of the housing is also provided with a cover. The first high-pressure oil passage is used to supply the first high-pressure oil to the drive part of the first clutch. The first high-pressure oil passage also includes a high-pressure oil inlet section. The beginning of the high-pressure oil inlet section is connected to the first high-pressure oil valve, and the end of the high-pressure oil inlet section is connected to the high-pressure axial section. A part of the high-pressure oil inlet section is disposed inside the cover. The first high-pressure oil valve is installed in the housing.

4. The oil passage structure of a vehicle transmission system according to claim 3, characterized in that: The oil passage structure also includes a second high-pressure oil passage that is isolated from the first high-pressure oil passage. The second high-pressure oil passage is used to supply second high-pressure oil to the second high-pressure oil component of the vehicle transmission system.

5. The oil passage structure of a vehicle transmission system according to claim 4, characterized in that: The vehicle transmission system includes a second clutch, the first clutch and the second clutch are axially spaced along the main shaft, the second high-pressure oil component includes a drive portion of the second clutch, and the second high-pressure oil passage is used to supply the second high-pressure oil to drive the second clutch to engage and transmit power.

6. The oil passage structure of a vehicle transmission system according to claim 5, characterized in that: The second clutch is closer to the cover than the first clutch. The cover has a mounting portion that protrudes toward the interior of the housing. The drive portion of the second clutch is connected to the mounting portion in a relative rotational relationship. A portion of the second high-pressure oil passage is disposed in the cover and extends to the mounting portion.

7. The oil passage structure of a vehicle transmission system according to claim 1, characterized in that: The low-pressure oil supply component includes a clutch reset part and a moving part to be lubricated. The low-pressure oil passage is used to allow the low-pressure oil to flow through it to drive the clutch to disengage and lubricate the moving part to be lubricated. The moving part to be lubricated is one or more of a bearing, a clutch friction disc, and a transmission gear.

8. The oil passage structure of a vehicle transmission system according to claim 7, characterized in that: The vehicle transmission system includes a housing and a cover. At least a portion of the low-pressure oil supply components are disposed within the housing. The low-pressure oil passage includes a low-pressure oil inlet section. The beginning of the low-pressure oil inlet section is connected to the cooling oil passage, and the end of the low-pressure oil inlet section is connected to the low-pressure axial section. A portion of the low-pressure oil inlet section is disposed within the cover.

9. The oil passage structure of a vehicle transmission system according to claim 7, characterized in that: The low-pressure radial section is provided in multiples and the multiple low-pressure radial sections are distributed at intervals along the axial direction of the main shaft. The multiple low-pressure radial sections are respectively connected to the bearing, clutch friction disc, transmission gear and reset part of wet clutch of the vehicle transmission system.

10. The oil passage structure of a vehicle transmission system according to claim 9, characterized in that: One of the low-pressure radial sections is used to connect to the gearbox.

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