A cooling and lubrication system and hybrid vehicle with motor and gearbox coupling design

Abstract

The present invention discloses a cooling and lubrication system and a hybrid vehicle with a motor and a gearbox coupling design. It includes a motor system and a gearbox system, wherein the motor system includes a low temperature zone unit, a medium and low temperature zone unit and a medium temperature zone unit, wherein the low temperature zone unit and the medium and low temperature zone unit respectively perform heat exchange with a first cooling system and a second cooling system; and further includes a third cooling system, wherein the gearbox system and the medium temperature zone unit perform heat exchange with the third cooling system, and the output end of the second cooling system is connected to the input end of the third cooling system. The present invention connects the gearbox and the motor medium temperature zone cooling system in series behind the motor low temperature zone and medium and low temperature zone cooling systems, recycles the motor coolant, improves the efficiency of the hybrid vehicle cooling system, and reduces the total coolant flow demand.

Description

Technical Field

[0001] The present invention belongs to the technical field of hybrid vehicles, and in particular relates to a cooling and lubrication system with a motor and a gearbox coupled design and a hybrid vehicle. Background Art

[0002] The cooling system of a hybrid vehicle generally needs to cool the engine, motor, gearbox, air compressor, emergency steering pump and other components. The structural layout of each component is shown in the following figure. Figure 1 shown.

[0003] Hybrid motors are divided into low-speed motors and high-speed motors. In order to improve the stability of vehicle transmission, commercial hybrid vehicles mostly adopt the structure of high-speed motor + motor planetary gear system. The high-speed motor is composed of PDU, motor controller, motor rotor, motor stator, hybrid motor planetary gear system and other units. When the motor is working, different units have different requirements for the optimal working temperature. They can be divided into low-temperature zone units, medium-low temperature zone units and medium-temperature zone units. The working temperature range of the medium-temperature zone unit is between 80℃ and 100℃, mainly including the hybrid motor planetary gear; the working temperature range of the medium-low temperature zone unit is between 40℃-60℃, mainly including the lubrication unit of the motor rotor and stator oil circuit. The working temperature range of the low-temperature zone unit is between 20℃ and 40℃, mainly including motor PDU, motor controller and other components. Due to the different working temperatures, the motor medium-temperature zone components and the medium-low temperature zone and low-temperature zone components need to be cooled or heated by independent cooling systems.

[0004] The optimal operating temperature range of components such as gearboxes, air compressors, and emergency steering pumps is between 80°C and 100°C, and a cooler is also required to heat or cool the lubrication.

[0005] In the prior art, the cooling systems of the motor and the gearbox are independent of each other and are respectively equipped with their own coolers and cooling pipes. The working principle diagram is shown in FIG. Figure 2 As shown, the coolant at 20℃-40℃ enters the motor, and the coolant first cools the motor PDU and motor controller, and then cools the motor rotor, stator lubrication oil circuit and motor planetary gear system before flowing back to the vehicle water tank. The coolant at 60℃-75℃ directly returns to the return water channel. The coolant is not fully utilized and the motor cooling system is inefficient.

[0006] In order to meet the heat dissipation requirements of motor components in different operating temperature ranges, the motor cooling system needs to be equipped with at least 2 or more coolers and cooling pipes, and the gearbox also needs to be equipped with a separate cooler and cooling pipe, which takes up a lot of space, has high component costs, many connection points, and unreliable sealing. The total flow rate of coolant in the vehicle cooling system is large, and the manufacturing cost of the cooling system of hybrid vehicles is high. Summary of the invention

[0007] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a cooling and lubrication system and a hybrid vehicle with a motor and a gearbox coupling design having a simple layout and low cost.

[0008] The technical solution adopted by the present invention is: a cooling and lubrication system with a motor and a gearbox coupling design, comprising a motor system and a gearbox system, wherein the motor system comprises a low temperature zone unit, a medium-low temperature zone unit and a medium temperature zone unit, wherein the low temperature zone unit and the medium-low temperature zone unit respectively perform heat exchange with a first cooling system and a second cooling system;

[0009] It also includes a third cooling system, the gearbox system and the medium temperature zone unit perform heat exchange with the third cooling system, and the output end of the second cooling system is connected to the input end of the third cooling system.

[0010] Furthermore, the water inlet of the first cooling system is connected to the coolant inlet channel, the water outlet is connected to the water inlet of the second cooling system, the water outlet of the second cooling system is connected to the water inlet of the third cooling system, and the water outlet of the third cooling system is connected to the coolant return channel.

[0011] Furthermore, the low temperature zone unit includes a motor PDU and a motor control unit.

[0012] Furthermore, the medium and low temperature zone unit includes a lubrication unit for the motor rotor and stator oil circuit.

[0013] Furthermore, the medium temperature zone unit is connected to a first heat exchange port of the third cooling system, and the transmission system is connected to a second heat exchange port of the third cooling system.

[0014] Furthermore, the medium temperature zone unit includes a motor planetary mechanism, an air compressor, an emergency steering pump and a motor oil pump. The lubricating oil circuit outlets of the motor planetary mechanism, the air compressor and the emergency steering pump are connected to one end of the motor oil pump, and the other end of the motor oil pump is connected to the lubricating oil circuit inlet of the motor planetary mechanism, the air compressor and the emergency steering pump through a pipeline after passing through the first heat exchange port.

[0015] Furthermore, the gearbox unit includes a gearbox lubrication unit and a gearbox oil pump, the lubrication oil circuit outlet of the gearbox lubrication unit is connected to one end of the gearbox oil pump, and the other end of the gearbox oil pump is connected to the lubrication oil circuit inlet of the gearbox lubrication unit through a pipeline after passing through the second heat exchange port.

[0016] Furthermore, the medium temperature zone unit and the gearbox system are connected in parallel and share an oil pump and are then connected to the same heat exchange port of the third cooling system.

[0017] Furthermore, the medium temperature zone unit includes a motor planetary mechanism, an air compressor, and an emergency steering pump; the gearbox system includes a gearbox lubrication unit; the lubricating oil circuit outlets of the motor planetary mechanism, the air compressor, the emergency steering pump, and the gearbox lubrication unit are connected to the heat exchange port of the third cooling system; and the heat exchange port is connected to the lubricating oil circuit inlet of the motor planetary mechanism, the air compressor, the emergency steering pump, and the gearbox lubrication unit through an oil pump.

[0018] A hybrid vehicle comprises a cooling and lubrication system with a motor and a gearbox coupled as described above.

[0019] The beneficial effects of the present invention are:

[0020] The present invention decouples the cooling and lubrication systems of the motor medium temperature zone unit from the motor low temperature zone unit and the medium and low temperature zone unit, and couples and designs the gearbox, the motor medium temperature zone unit lubrication and cooling systems into an integrated cooling and lubrication system according to the operating temperature range of the components. At the same time, the gearbox and the motor medium temperature zone cooling system are connected in series behind the motor low temperature zone and the medium and low temperature zone cooling systems, so that the motor coolant is reused for a second time, thereby improving the cooling system efficiency of the hybrid vehicle and reducing the total coolant flow demand.

[0021] The present invention decouples the cooling and lubrication systems of the motor planetary gear train from the motor rotor, stator and other component units, and couples the motor planetary gear train with the gearbox lubrication and cooling systems according to the optimal operating temperature zones. Through the coupling design, an oil pump is shared to reduce the number of parts in the lubrication system, a cooler is shared to reduce the number of parts in the cooling system, connecting pipelines are reduced, leakage risks are reduced, and manufacturing costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the layout of various components on a hybrid vehicle.

[0023] Figure 2 This is a schematic diagram of the layout principle of cooling and lubrication of various components on existing hybrid vehicles.

[0024] Figure 3 It is a schematic diagram of a first embodiment of the cooling and lubrication system of the present invention.

[0025] Figure 4 It is a schematic diagram of the second embodiment of the cooling and lubrication system of the present invention. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] The present invention provides a cooling and lubrication system of a motor and a gearbox coupling design, comprising a motor system and a gearbox system, wherein the motor system comprises a low temperature zone unit, a medium-low temperature zone unit and a medium temperature zone unit, wherein the low temperature zone unit and the medium-low temperature zone unit respectively perform heat exchange with a first cooling system and a second cooling system;

[0028] It also includes a third cooling system (ie, the heat exchanger shown in the figure), the gearbox system and the medium temperature zone unit perform heat exchange with the third cooling system, and the output end of the second cooling system is connected to the input end of the third cooling system.

[0029] The present invention decouples the cooling and lubrication systems of the motor medium temperature zone unit from the motor low temperature zone unit and the medium and low temperature zone unit, and couples and designs the gearbox, the motor medium temperature zone unit lubrication and cooling systems into an integrated cooling and lubrication system according to the operating temperature range of the components. At the same time, the gearbox and the motor medium temperature zone cooling system are connected in series behind the motor low temperature zone and the medium and low temperature zone cooling systems, so that the motor coolant is reused for a second time, thereby improving the cooling system efficiency of the hybrid vehicle and reducing the total coolant flow demand.

[0030] In the above scheme, the water inlet of the first cooling system is connected to the coolant inlet channel, the water outlet is connected to the water inlet of the second cooling system, the water outlet of the second cooling system is connected to the water inlet of the third cooling system, and the water outlet of the third cooling system is connected to the coolant return channel.

[0031] In the above solution, the low temperature zone unit includes a motor PDU and a motor control unit, and the medium and low temperature zone unit includes a lubrication unit for the motor rotor and stator oil circuit.

[0032] In the above solution, the medium temperature zone unit is connected to the first heat exchange port of the third cooling system, and the transmission system is connected to the second heat exchange port of the third cooling system.

[0033] Specifically, the medium temperature zone unit includes a motor planetary mechanism, an air compressor, an emergency steering pump and a motor oil pump, the lubricating oil outlets of the motor planetary mechanism, the air compressor and the emergency steering pump are connected to one end of the motor oil pump, and the other end of the motor oil pump is connected to the lubricating oil inlet of the motor planetary mechanism, the air compressor and the emergency steering pump through a pipeline after passing through a first heat exchange port. The gearbox unit includes a gearbox lubrication unit and a gearbox oil pump, the lubricating oil outlet of the gearbox lubrication unit is connected to one end of the gearbox oil pump, and the other end of the gearbox oil pump is connected to the lubricating oil inlet of the gearbox lubrication unit through a pipeline after passing through a second heat exchange port.

[0034] In the above scheme, the medium temperature zone unit and the gearbox system are connected in parallel and share an oil pump and are connected to the same heat exchange port of the third cooling system. Specifically, the medium temperature zone unit includes a motor planetary mechanism, an air compressor, and an emergency steering pump, and the gearbox system includes a gearbox lubrication unit. The lubricating oil outlets of the motor planetary mechanism, the air compressor, the emergency steering pump, and the gearbox lubrication unit are connected to the heat exchange port of the third cooling system, and the heat exchange port is connected to the lubricating oil inlet of the motor planetary mechanism, the air compressor, the emergency steering pump, and the gearbox lubrication unit through the oil pump.

[0035] The present invention also provides a hybrid vehicle, comprising a cooling and lubrication system with a motor and a gearbox coupled thereto as described above.

[0036] Embodiment 1

[0037] like Figure 3 As shown, it is a solution of the present invention in which the motor medium temperature zone unit, the low temperature zone unit and the medium and low temperature zone components are decoupled, and the gearbox and the motor medium temperature zone unit are only coupled to the cooling water circuit to share the heat exchanger, which includes a motor system and a gearbox system, the motor system includes a low temperature zone unit, a medium and low temperature zone unit and a medium temperature zone unit, the low temperature zone unit and the medium and low temperature zone unit respectively exchange heat with the first cooling system and the second cooling system; and also includes a third cooling system, the gearbox system and the medium temperature zone unit exchange heat with the third cooling system, and the output end of the second cooling system is connected to the input end of the third cooling system.

[0038] The present invention decouples the cooling and lubrication systems of the motor medium temperature zone unit from the motor low temperature zone unit and the medium and low temperature zone unit, and couples and designs the gearbox, the motor medium temperature zone unit lubrication and cooling systems into an integrated cooling and lubrication system according to the operating temperature range of the components. At the same time, the gearbox and the motor medium temperature zone cooling system are connected in series behind the motor low temperature zone and the medium and low temperature zone cooling systems, so that the motor coolant is reused for a second time, thereby improving the cooling system efficiency of the hybrid vehicle and reducing the total coolant flow demand.

[0039] The connection relationship of the above three cooling systems is: the water inlet of the first cooling system is connected to the coolant water inlet channel, the water outlet is connected to the water inlet of the second cooling system, the water outlet of the second cooling system is connected to the water inlet of the third cooling system, and the water outlet of the third cooling system is connected to the coolant return channel. The medium temperature zone unit is connected to the first heat exchange port of the third cooling system, and the gearbox system is connected to the second heat exchange port of the third cooling system.

[0040] Specifically, the medium temperature zone unit includes a motor planetary mechanism, an air compressor, an emergency steering pump and a motor oil pump, the lubricating oil outlets of the motor planetary mechanism, the air compressor and the emergency steering pump are connected to one end of the motor oil pump, and the other end of the motor oil pump is connected to the lubricating oil inlet of the motor planetary mechanism, the air compressor and the emergency steering pump through a pipeline after passing through a first heat exchange port. The gearbox unit includes a gearbox lubrication unit and a gearbox oil pump, the lubricating oil outlet of the gearbox lubrication unit is connected to one end of the gearbox oil pump, and the other end of the gearbox oil pump is connected to the lubricating oil inlet of the gearbox lubrication unit through a pipeline after passing through a second heat exchange port.

[0041] Embodiment 2

[0042] like Figure 4 As shown, the present invention shows a scheme in which the gearbox and the motor medium temperature zone components lubricating oil circuits are coupled to share a common oil pump, and the cooling water circuits are coupled to share a common cooler. The difference from the first embodiment is that in this embodiment, the motor planetary mechanism, air compressor, emergency steering pump, and gearbox lubrication unit share an oil pump, and the lubricating oil circuit outlets of the motor planetary mechanism, air compressor, emergency steering pump, and gearbox lubrication unit are connected to the heat exchange port of the third cooling system, and the heat exchange port is connected to the lubricating oil circuit inlet of the motor planetary mechanism, air compressor, emergency steering pump, and gearbox lubrication unit through the oil pump. The present invention decouples the cooling and lubricating systems of the motor planetary gear train and the motor rotor, stator and other component units, and couples the motor planetary gear train with the gearbox lubrication and cooling systems according to the optimal working temperature zoning. Through the coupling design, the oil pump is shared to reduce the number of parts in the lubrication system, and the cooler is shared to reduce the number of parts in the cooling system, reduce the connecting pipelines, reduce the risk of leakage, and reduce the manufacturing cost.

[0043] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0044] In order to make the description of the present disclosure more detailed and complete, the above description is provided for the implementation and specific embodiments of the present invention; however, this is not the only form of implementing or using the specific embodiments of the present invention. The implementation covers the features of multiple specific embodiments and the method steps and sequences used to construct and operate these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences.

[0045] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0046] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0047] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0048] The above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0049] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A cooling and lubrication system designed for coupling a motor and a gearbox, characterized in that: It includes a motor system and a gearbox system, wherein the motor system includes a low temperature zone unit, a medium and low temperature zone unit and a medium temperature zone unit, and the low temperature zone unit and the medium and low temperature zone unit respectively exchange heat with the first cooling system and the second cooling system; It also includes a third cooling system, the gearbox system and the medium temperature zone unit perform heat exchange with the third cooling system, and the output end of the second cooling system is connected to the input end of the third cooling system; The medium temperature zone unit is connected to the first heat exchange port of the third cooling system, and the gearbox system is connected to the second heat exchange port of the third cooling system. The medium temperature zone unit includes a motor planetary mechanism, an air compressor, an emergency steering pump and a motor oil pump. The lubricating oil circuit outlets of the motor planetary mechanism, the air compressor and the emergency steering pump are connected to one end of the motor oil pump, and the other end of the motor oil pump is connected to the lubricating oil circuit inlet of the motor planetary mechanism, the air compressor and the emergency steering pump through a pipeline after passing through the first heat exchange port; the gearbox system includes a gearbox lubrication unit and a gearbox oil pump. The lubricating oil circuit outlet of the gearbox lubrication unit is connected to one end of the gearbox oil pump, and the other end of the gearbox oil pump is connected to the lubricating oil circuit inlet of the gearbox lubrication unit through a pipeline after passing through the second heat exchange port; Or, the medium temperature zone unit and the gearbox system are connected in parallel and share an oil pump and are then connected to the same heat exchange port of the third cooling system. The medium temperature zone unit includes a motor planetary mechanism, an air compressor, and an emergency steering pump. The gearbox system includes a gearbox lubrication unit. The lubricating oil circuit outlets of the motor planetary mechanism, the air compressor, the emergency steering pump, and the gearbox lubrication unit are connected to the heat exchange port of the third cooling system, and the heat exchange port is connected to the lubricating oil circuit inlet of the motor planetary mechanism, the air compressor, the emergency steering pump, and the gearbox lubrication unit through the oil pump.

2. The cooling and lubrication system of the motor and gearbox coupling design according to claim 1 is characterized in that: The water inlet of the first cooling system is connected to the coolant water inlet channel, and the water outlet is connected to the water inlet of the second cooling system. The water outlet of the second cooling system is connected to the water inlet of the third cooling system, and the water outlet of the third cooling system is connected to the coolant return channel.

3. The cooling and lubrication system of the motor and gearbox coupling design according to claim 1 is characterized in that: The low temperature zone unit includes a motor PDU and a motor control unit.

4. The cooling and lubrication system of the motor and gearbox coupling design according to claim 1 is characterized in that: The medium and low temperature zone unit includes a lubrication unit for the motor rotor and stator oil circuit.

5. A hybrid vehicle, characterized in that: A cooling and lubrication system comprising a motor and a gearbox coupling design as described in any one of claims 1 to 4.

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