Gearbox and powertrain of a hybrid vehicle

Abstract

The present disclosure relates to the technical field of oil circuit system of hybrid vehicle gearbox, and particularly relates to a gearbox and a power assembly of a hybrid vehicle. The gearbox comprises an oil circuit system and a gearbox housing, wherein the oil circuit system comprises a low-pressure system and a high-pressure system; the low-pressure system comprises a first oil pump and a first oil storage cavity, an oil inlet of the first oil pump is communicated with the first oil storage cavity, and an oil outlet of the first oil pump is communicated with the inside of the gearbox; the high-pressure system comprises a second oil pump, a second oil storage cavity, a valve plate, an electromagnetic valve and a controller; and the valve plate is provided with a main oil circuit and a branch circuit. The gearbox can utilize gravity and a slope formed by the flow guide channel itself to make the oil body deposited at the bottom of the gear shifting mechanism flow into the first oil storage cavity and enter the circulation of the low-pressure system, thereby not affecting the layout of the high-pressure system and the gear shifting mechanism, and at the same time, the oil body at the bottom of the gear shifting mechanism can be effectively guided into the first oil storage cavity in time.

Description

Technical Field

[0001] This disclosure relates to the field of hydraulic circuit system technology for hybrid vehicle transmissions, and more particularly to a transmission and a powertrain for hybrid vehicles. Background Technology

[0002] Hybrid vehicle transmissions typically require a hydraulic system to supply both high-pressure and low-pressure oil during normal operation. High-pressure oil is primarily used for clutch control, while low-pressure oil is mainly used for lubrication of bearings and gears, as well as cooling of the clutch and motor. Both high-pressure and low-pressure oil are usually supplied by the same oil pump.

[0003] For hybrid transmissions, especially dedicated hybrid transmissions, the high-pressure system and the low-pressure system are often completely isolated. The high-pressure system needs to be placed close to the transmission mechanism. In this case, the oil pan in the low-pressure system often needs to be very low to ensure that all the cooling oil in the transmission mechanism can flow back to the oil pan of the low-pressure system for circulation. This arrangement will increase the size of the transmission and make the layout of the entire transmission more difficult. Summary of the Invention

[0004] To address the aforementioned technical problems, this disclosure provides a transmission and a powertrain for a hybrid vehicle.

[0005] In a first aspect, this disclosure provides a transmission, including: an oil circuit system and a transmission housing, said oil circuit system including a low-pressure system and a high-pressure system;

[0006] The low-pressure system includes a first oil pump and a first oil reservoir. The oil inlet of the first oil pump is connected to the first oil reservoir, and the oil outlet of the first oil pump is connected to the inside of the gearbox.

[0007] The high-pressure system includes a second oil pump, a second oil storage chamber, a valve plate, a solenoid valve, and a controller. The valve plate has a main oil circuit and a branch circuit. The second oil pump and the solenoid valve are both electrically connected to the controller. The oil inlet of the second oil pump is connected to the second oil storage chamber. The oil outlet of the second oil pump and the oil inlet of the solenoid valve are both connected to the main oil circuit. The oil outlet of the solenoid valve is connected to the piston oil chamber of the clutch through the branch circuit.

[0008] In the radial direction, the high-pressure system is opposite to the transmission mechanism in the gearbox, and the second oil reservoir is a closed oil reservoir; a guide channel is provided at the bottom of the gearbox housing, and a notch communicating with the guide channel is provided at the top of the first oil reservoir, and the end of the guide channel facing the transmission mechanism is higher than the end facing the notch; the guide channel is used to guide the oil at the bottom of the transmission mechanism into the first oil reservoir.

[0009] Optionally, the high-pressure system further comprises an accumulator and a first one-way valve, the accumulator is internally provided with an elastic member and a third oil storage cavity, the third oil storage cavity is in communication with the main oil passage through a first interface, the first one-way valve is arranged between the second oil pump and the first interface, and oil in the first one-way valve flows from the second oil pump to the first interface in one direction.

[0010] When the oil pressure at the first interface is greater than the oil pressure of the third oil storage cavity, the third oil storage cavity absorbs oil from the main oil passage and compresses the elastic member, and when the oil pressure of the third oil storage cavity is greater than the oil pressure at the first interface, the elastic member is elongated and discharges the oil in the third oil storage cavity.

[0011] Optionally, the high-pressure system further comprises a pressure sensor, the pressure sensor is arranged between the first interface and the electromagnetic valve, and the pressure sensor is electrically connected with the controller.

[0012] Optionally, the high-pressure system further comprises a filter, and the filter is arranged on the main oil passage.

[0013] Optionally, the high-pressure system further comprises a second one-way valve, an oil inlet end of the second one-way valve is in communication with an oil inlet port of the filter, and an oil outlet end of the second one-way valve is in communication with an oil outlet port of the filter.

[0014] Optionally, the valve plate is an integral structure, and the main oil passage and the branch passage are formed by straight hole machining.

[0015] Optionally, the transmission further comprises a clutch, and an outlet of the branch passage and a piston oil cavity of the clutch are arranged opposite to each other in the radial direction of the transmission.

[0016] Optionally, the outlet of the branch passage is in communication with the piston oil cavity of the clutch through a connecting pipe.

[0017] Optionally, both ends of the connecting pipe are provided with sealing members.

[0018] Optionally, the sealing members are elastic members, and are arranged in compression between the end of the connecting pipe and the piston oil cavity of the clutch.

[0019] and / or the sealing members are arranged in compression between the shaft end of the connecting pipe and the outlet of the branch passage.

[0020] In a second aspect, the disclosure provides a power assembly of a hybrid vehicle using the transmission as described above.

[0021] Compared with the prior art, the technical scheme provided by the embodiments of the disclosure has the following advantages:

[0022] The gearbox and the oil circuit system provided by the present disclosure completely separate the high-pressure system from the low-pressure system, and use different electronic oil pumps to provide high-pressure oil and low-pressure oil respectively. Through the arrangement of the flow guide channel, the oil deposited at the bottom of the transmission mechanism can flow into the first oil storage cavity and enter the circulation of the low-pressure system, which does not affect the layout of the high-pressure system and the transmission mechanism, and can effectively guide the oil at the bottom of the transmission mechanism into the first oil storage cavity in time. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings incorporated into the specification and forming a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0025] Figure 1 The working principle diagram of the high-pressure system in the oil circuit system in the gearbox described in the embodiments of the present disclosure;

[0026] Figure 2 The working principle diagram of the low-pressure system in the oil circuit system in the gearbox described in the embodiments of the present disclosure;

[0027] Figure 3 The structural schematic diagram of the gearbox described in the embodiments of the present disclosure;

[0028] Figure 4 The structural schematic diagram of one of the high-pressure oil circuits in the gearbox described in the embodiments of the present disclosure;

[0029] Figure 5 The structural schematic diagram of the high-pressure system in the gearbox described in the embodiments of the present disclosure.

[0030] Among them, 11, the first oil pump; 12, the first oil storage cavity; 21, the second oil pump; 22, the second oil storage cavity; 23, the valve plate; 24, the accumulator; 241, the elastic member; 242, the third oil storage cavity; 243, the first interface; 25, the pressure sensor; 26, the filter; 27, the connecting pipe; 28, the sealing member; 29, the electromagnetic valve; 3, the gearbox housing; 31, the flow guide channel; 41, the first one-way valve; 42, the second one-way valve; 5, the hydraulic separation bearing. DETAILED DESCRIPTION

[0031] In order to enable a more clear understanding of the above-mentioned purposes, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other manners different from those described herein; obviously, the embodiments described in the specification are only a part of the embodiments of the present disclosure, and not all the embodiments.

[0033] The gearbox of the hybrid vehicle usually needs a hydraulic system including a high-pressure system and a low-pressure system when working normally, the high-pressure system provides high-pressure oil, and the low-pressure system provides low-pressure oil, the high-pressure oil is mainly used for clutch control, and the low-pressure oil is mainly used for bearing and gear lubrication, and clutch and motor cooling.

[0034] For hybrid gearbox, especially hybrid special gearbox, the high-pressure system and the low-pressure system are often completely isolated, and the high-pressure system needs to be arranged close to the transmission mechanism, at this time, the oil sump in the low-pressure system often needs to be very low to ensure that the cooling oil in the transmission mechanism can all flow back to the oil sump in the low-pressure system for circulation; such arrangement will cause the volume of the gearbox to increase, affecting the arrangement difficulty of the whole gearbox.

[0035] Based on this, the embodiment provides a gearbox and a power assembly of a hybrid vehicle, by arranging a flow guide channel, the oil body deposited at the bottom of the transmission mechanism can flow into the first oil storage cavity by gravity and the slope formed by the flow guide channel itself, enter the circulation of the low-pressure system, which does not affect the layout of the high-pressure system and the transmission mechanism, and can also effectively guide the oil body at the bottom of the transmission mechanism into the first oil storage cavity in time. The following will be described in detail through specific embodiments:

[0036] With reference to Figures 1 to 5As shown, the gearbox provided by the embodiment includes an oil circuit system and a gearbox housing 3, the oil circuit system includes a low-pressure system and a high-pressure system; the low-pressure system includes a first oil pump 11 and a first oil storage cavity 12, an oil inlet of the first oil pump 11 communicates with the first oil storage cavity 12, an oil outlet of the first oil pump 11 communicates with the inside of the gearbox, and the oil pumped out of the first oil pump 11 is used to provide cooling and lubrication for the generator stator, the generator rotor, the driving motor stator, the driving motor rotor and the gear mechanism; the high-pressure system includes a second oil pump 21, a second oil storage cavity 22, a valve plate 23, an electromagnetic valve 29 and a controller; the valve plate 23 is provided with a main oil circuit and a branch circuit, the second oil pump 21 and the electromagnetic valve 29 are electrically connected with the controller, it should be understood that the second oil pump 21 is an electronic pump and can be accurately controlled through the controller, it should be noted that the first oil pump 11 can also be an electronic pump, an oil inlet of the second oil pump 21 communicates with the second oil storage cavity 22, an oil outlet of the second oil pump 21 and an oil inlet of the electromagnetic valve 29 both communicate with the main oil circuit, and an oil outlet of the electromagnetic valve 29 communicates with a piston oil cavity of a clutch through the branch circuit; in the radial direction, the high-pressure system is opposite to the gear mechanism in the gearbox, and the second oil storage cavity 22 is a closed oil cavity; a flow guide channel 31 is formed in the bottom of the gearbox housing 3, a notch is formed in the top of the first oil storage cavity 12 and communicates with the flow guide channel 31, and an end of the flow guide channel 31 towards the gear mechanism is higher than an end thereof towards the notch; the flow guide channel 31 is used to guide the oil at the bottom of the gear mechanism into the first oil storage cavity 12.

[0037] Among them, the oil circuit system provided by the present disclosure completely separates the high-pressure system from the low-pressure system, and uses different electronic oil pumps to provide high-pressure oil and low-pressure oil respectively. Through the setting of the flow guide channel 31, the oil body deposited at the bottom of the gear mechanism can flow into the first oil storage cavity 12 by using gravity and the slope formed by the flow guide channel 31 itself, and enter the circulation of the low-pressure system, which does not affect the layout of the high-pressure system opposite to the gear mechanism, and can also timely and effectively guide the oil body at the bottom of the gear mechanism into the first oil storage cavity 12.

[0038] In some embodiments, the high-pressure system further comprises an accumulator 24 and a first one-way valve 41, the accumulator 24 is provided with an elastic element 241 and a third oil storage cavity 242, the third oil storage cavity 242 is communicated with the main oil circuit through a first interface 243, the first one-way valve 41 is arranged between the second oil pump 21 and the first interface 243, the oil in the first one-way valve 41 flows from the second oil pump 21 to the first interface 243 in one direction; when the oil pressure at the first interface 243 is greater than the oil pressure of the third oil storage cavity 242, the third oil storage cavity 242 absorbs oil from the main oil circuit and compresses the elastic element 241, and when the oil pressure of the third oil storage cavity 242 is greater than the oil pressure at the first interface 243, the elastic element 241 is elongated and discharges the oil in the third oil storage cavity 242; by arranging the accumulator 24 between the second oil pump 21 and the electromagnetic valve 29, when the second oil pump 21 absorbs sufficient oil from the second oil storage cavity 22, the accumulator 24 starts to absorb oil through the high oil pressure established at the first interface 243, thereby establishing a high-pressure oil cavity, and when the high-pressure oil cavity is established, the second oil pump 21 can be closed to stop oil supply, and the oil stored in the high-pressure oil cavity can be released to the main oil circuit when the oil pressure of the main oil circuit is less than the working oil pressure, thereby ensuring the oil supply of the electromagnetic valve 29, that is, the second oil pump 21 can work intermittently with the accumulator 24, which can significantly reduce the energy consumption of the entire oil supply system; and when the high-pressure system is used, a smaller amount of oil can be used due to its strong sealing property.

[0039] With reference to Figure 1 , Figure 3 , Figure 4 and Figure 5 , the high-pressure system further comprises a pressure sensor 25, the pressure sensor 25 is arranged between the first interface 243 and the electromagnetic valve 29, and the pressure sensor 25 is electrically connected with the controller; through the arrangement of the pressure sensor 25, the oil pressure of the main oil circuit can be monitored in real time, and when the accumulator 24 cannot provide sufficient oil pressure, the second oil pump 21 can work in time to supplement the oil and increase the oil pressure of the main oil circuit.

[0040] With reference to Figure 1 , Figure 2 and Figure 5 , the high-pressure system further comprises a filter 26, the filter 26 is arranged on the main oil circuit; the arrangement of the filter 26 can ensure that the accumulator 24, the pressure sensor 25 and the electromagnetic valve 29 are not affected by impurities in the oil circuit, so as to ensure the cleanliness of the entire system and improve the stability and reliability of the entire system; it should be noted that the low-pressure system can also comprise the filter 26, which can be arranged between the first oil pump 11 and the first oil storage cavity 12 or at the rear side of the oil outlet of the first oil pump 11.

[0041] In some embodiments, the high-pressure system further comprises a second one-way valve 42, an inlet of the second one-way valve 42 being in communication with the inlet of the filter 26, and an outlet of the second one-way valve 42 being in communication with the outlet of the filter 26; it should be understood that the second one-way valve 42 can be opened for use when the filter 26 is blocked, so as to ensure that the main oil passage is fully supplied with oil when the filter 26 is not replaced in time, thereby improving the safety of the vehicle.

[0042] In some embodiments, the valve plate 23 is of an integral structure, and the main oil passage and the branch passage are formed by straight hole machining; that is, all the oil passages have complete pipe walls, and only the opening ends need to be sealed, which is more efficient and can also avoid oil leakage of the valve plate 23 itself.

[0043] In some embodiments, the gearbox further comprises a clutch, the outlet of the branch passage and a piston oil chamber of the clutch are arranged opposite in the radial direction of the gearbox, and a piston of the clutch is connected to the piston oil chamber through a hydraulic separation bearing 5; that is, the clutch is of a CSC structure, which can better ensure that the clutch does not leak oil at the piston oil chamber, thereby ensuring the sealing of the entire high-pressure system; it should be understood that the electromagnetic valve 29 can control the oil outlet amount by controlling the stroke of the spool, so as to control the clutch connected thereto to switch between the separated state, the sliding state and the combined state; in this way, the outlet and the piston oil chamber of the clutch can be directly connected through a radial or radial-angled connecting pipe 27, and only the two ends of the connecting pipe 27 need to be sealed, the entire structure is simpler, and the sealing treatment is easier; moreover, such an oil passage layout can significantly shorten the oil supply distance and reduce the oil consumption, and it is no longer necessary to open an oil passage on the gearbox housing 3, thereby reducing the difficulty of opening the oil passage.

[0044] It should be noted that the number of electromagnetic valves 29 can be matched with the number of clutches, and the number of branch passages is also matched with the number of clutches, forming a one-to-one correspondence.

[0045] Continuing to refer to Figure 4 As shown, the outlet of the branch passage is in communication with the piston oil chamber of the clutch through the connecting pipe 27.

[0046] In some embodiments, the two ends of the connecting pipe 27 are each provided with a sealing member 28.

[0047] In a further embodiment, the seal 28 is an elastic member and is compressed between the end of the connecting pipe 27 and the piston oil chamber of the clutch; and / or the seal 28 is compressed between the shaft end of the connecting pipe 27 and the outlet of the branch; it should be noted that the seal 28 can be located between the connecting pipe 27 and the inner wall of the piston oil chamber in the radial direction, or can be located between the connecting pipe 27 and the opening of the piston oil chamber in the axial direction, as long as a stable sealing structure can be formed by extruding the seal 28.

[0048] It should be noted that the working pressure of the pressure sensor 25 can be greater than or equal to 60 bar, and the burst pressure thereof can be 120 bar; the opening pressure of the filter 26 can be 0.25 bar, and the sealing pressure can be 280 bar; the working pressure of the first one-way valve 41 and the second one-way valve 42 can both be less than or equal to 70 bar, and the opening pressure of both can be 1±0.3 bar; the working pressure of the accumulator 24 can be greater than or equal to 35 bar to less than or equal to 62 bar; the input pressure of the electromagnetic valve 29 can be 45±2 bar, and the output pressure can be greater than or equal to 40.8 bar.

[0049] In a second aspect, the disclosure provides a power assembly of a hybrid vehicle using the gearbox as described above.

[0050] The specific implementation and implementation principles are the same as those of the above-described embodiments and can bring the same or similar technical effects, which will not be described here again. For details, refer to the description of the above-described gearbox embodiments.

[0051] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement“comprising a……” does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0052] The foregoing is merely illustrative of the various implementations of the present disclosure and the general principles thereof. Numerous modifications can be made to these illustrations, and equivalents can be substituted therefor, without departing from the scope of the present disclosure. The specific embodiments commensurate with the specific application are intended to be illustrative only and not limiting of the scope of the application as set forth in the following claims.

Claims

1. A gearbox, characterized in that The application relates to a transmission oil circuit system and a transmission housing (3), wherein the oil circuit system comprises a low-pressure system and a high-pressure system. The low-pressure system comprises a first oil pump (11) and a first oil storage cavity (12), the oil inlet of the first oil pump (11) is communicated with the first oil storage cavity (12), and the oil outlet of the first oil pump (11) is communicated with the inside of the transmission. The high-pressure system comprises a second oil pump (21), a second oil storage cavity (22), a valve plate (23), an electromagnetic valve (29) and a controller, the valve plate (23) is provided with a main oil circuit and a branch circuit, the second oil pump (21) and the electromagnetic valve (29) are electrically connected with the controller, the oil inlet of the second oil pump (21) is communicated with the second oil storage cavity (22), the oil outlet of the second oil pump (21) and the oil inlet of the electromagnetic valve (29) are communicated with the main oil circuit, the oil outlet of the electromagnetic valve (29) is communicated with the piston oil cavity of a clutch through the branch circuit, and the high-pressure system further comprises a filter (26) and a second check valve (42), the filter (26) is arranged on the main oil circuit, the oil inlet end of the second check valve (42) is communicated with the oil inlet of the filter (26), and the oil outlet end of the second check valve (42) is communicated with the oil outlet of the filter (26). In the radial direction, the high-pressure system is opposite to a shifting mechanism in the transmission, and the second oil storage cavity (22) is a closed oil cavity; a flow guide channel (31) is arranged at the bottom of the transmission housing (3), a notch is arranged at the top of the first oil storage cavity (12) and communicated with the flow guide channel (31), and the end of the flow guide channel (31) towards the shifting mechanism is higher than the end of the flow guide channel (31) towards the notch; and the flow guide channel (31) is used for guiding the oil at the bottom of the shifting mechanism into the first oil storage cavity (12). The high-pressure system further comprises an accumulator (24) and a first check valve (41), the accumulator (24) is provided with an elastic element (241) and a third oil storage cavity (242), the third oil storage cavity (242) is communicated with the main oil circuit through a first interface (243), the first check valve (41) is arranged between the second oil pump (21) and the first interface (243), and the oil in the first check valve (41) flows from the second oil pump (21) to the first interface (243) in one direction.

2. The gearbox according to claim 1, characterized in that When the oil pressure at the first interface (243) is greater than the oil pressure of the third oil storage cavity (242), the third oil storage cavity (242) absorbs oil from the main oil circuit and compresses the elastic element (241); when the oil pressure of the third oil storage cavity (242) is greater than the oil pressure at the first interface (243), the elastic element (241) is elongated and discharges the oil in the third oil storage cavity (242). The high-pressure system further comprises a pressure sensor (25), the pressure sensor (25) is arranged between the first interface (243) and the electromagnetic valve (29), and the pressure sensor (25) is electrically connected with the controller.

3. The gearbox of claim 2, wherein, ​ 4. The gearbox of claim 1, wherein, The valve plate (23) is an integral structure, and the main oil path and the branch path are formed by straight hole machining.

5. The gearbox of claim 1, wherein, Further comprising a clutch, and the outlet of the branch path and the piston oil cavity of the clutch are arranged opposite in the radial direction of the gearbox.

6. The gearbox of claim 5, wherein, The outlet of the branch path is communicated with the piston oil cavity of the clutch through a connecting pipe (27).

7. The gearbox of claim 6, wherein, Both ends of the connecting pipe (27) are provided with a sealing element (28).

8. The gearbox of claim 7, wherein, The sealing element (28) is an elastic element, and is compressed between the end of the connecting pipe (27) and the piston oil cavity of the clutch. And / or the sealing element (28) is compressed between the shaft end of the connecting pipe (27) and the outlet of the branch path.

9. A powertrain of a hybrid vehicle, characterized by comprising: The gearbox according to any one of claims 1 to 8.

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