CN-115929943-B - Flow distribution device, electric drive system and vehicle

CN115929943BCN 115929943 BCN115929943 BCN 115929943BCN-115929943-B

Abstract

The invention provides a flow distribution device, an electric driving system and a vehicle, wherein the flow distribution device comprises a shell, at least one oil inlet cavity and a plurality of oil return cavities are formed in the shell, a plurality of oil passages are formed in the oil inlet cavity, a valve core is slidably arranged in the oil inlet cavity, a temperature memory spring is correspondingly arranged in each oil return cavity, the plurality of temperature memory springs are connected with the valve core, and the temperature memory springs control the valve core to slide in the oil inlet cavity based on the temperature of oil so as to regulate the flow of cooling oil in the plurality of oil passages. By applying the technical scheme of the invention, the flow regulation effect of the cooling oil in the part needing cooling in the electric drive system is realized. According to the scheme, the automatic flow distribution is realized through a purely mechanical structure without using a sensor or an electric control actuator, so that the heat dissipation efficiency of the electric drive system is effectively improved, the temperature of the electric drive system under high load is reduced, and the flow distribution device is simple and compact in structure and convenient to arrange.

Inventors

BAO XUANMING
FU CHAO
LI FENGYONG
MEI XIANGNAN
ZHAO XUESONG
WANG ZHIMING
GU ZHENYU
LIU PEILONG

Assignees

中国第一汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20221117

Claims (7)

1. A flow distribution device, comprising: The oil return device comprises a shell (10), wherein at least one oil inlet cavity (11) and a plurality of oil return cavities (12) are formed in the shell (10), and a plurality of oil paths are formed in the oil inlet cavity (11); the valve core (20) is arranged in the oil inlet cavity (11) in a sliding manner; The temperature memory springs (30) are correspondingly arranged in the oil return cavities (12), the temperature memory springs (30) are connected with the valve cores (20), and the temperature memory springs (30) control the valve cores (20) to slide in the oil inlet cavities (11) based on oil temperature so as to adjust the flow of cooling oil in a plurality of oil paths; The oil passages comprise a first oil passage (111), a second oil passage (112) and a third oil passage (113), the first oil passage (111) and the second oil passage (112) are arranged side by side along the radial direction of the shell (10), the first oil passage (111) and the second oil passage (112) are all arranged in an extending mode along the axial direction of the shell (10), the first oil passage (111) is provided with a first inlet (1111), the second oil passage (112) is provided with a second inlet (1121), and the first oil passage (111), the second oil passage (112) and the third oil passage (113) are arranged in a communicating mode through the oil inlet cavity (11); the end faces of the first end and the second end of the valve core (20) are respectively provided with a separation part (21), the separation parts (21) are used for separating the oil inlet cavity (11) from the oil return cavity (12), and the separation parts (21) are of annular structures; A first valve port (22) is formed in one end of the valve core (20), a second valve port (23) is formed in the other end of the valve core (20), and the valve core (20) is matched with the first inlet (1111) through the first valve port (22) in the sliding process in the oil inlet cavity (11), and the second valve port (23) is matched with the second inlet (1121) so as to adjust the overflow of the first inlet (1111) and the second inlet (1121).
2. The flow distribution device according to claim 1, wherein the number of the oil inlet cavities (11) is one, the number of the oil return cavities (12) is two, the oil inlet cavities (11) are positioned between the two oil return cavities (12), and the oil inlet cavities (11) and the oil return cavities (12) are all arranged in an extending manner along the radial direction of the shell (10).
3. Flow distribution device according to claim 2, characterized in that both oil return chambers (12) are provided with a return oil circuit extending in the axial direction of the housing (10), and in that the return oil circuit is arranged in communication with the oil return chambers (12), the return oil circuit having an oil return inlet (121) and an oil return outlet (122).
4. A flow distribution device according to any one of claims 1-3, characterized in that the valve core (20) is of cylindrical structure.
5. The flow distribution device according to claim 1, characterized in that a communication channel is arranged between the oil inlet cavity (11) and the oil return cavity (12), a stop ring (40) is arranged in the communication channel, the inner diameter of the stop ring (40) is smaller than the outer diameter of the valve core (20), one end of the temperature memory spring (30) is abutted with the inner wall of the oil return cavity (12), and the other end of the temperature memory spring (30) passes through the stop ring (40) to be abutted with the valve core (20).
6. An electric drive system comprising a flow distribution device according to any one of claims 1-5.
7. A vehicle comprising an electric drive system, the electric drive system being as claimed in claim 6.

Description

Flow distribution device, electric drive system and vehicle Technical Field The invention relates to the technical field of vehicles, in particular to a flow distribution device, an electric drive system and a vehicle. Background With the development of electric vehicles, the driving core system, i.e. the electric driving system, is also developed towards the directions of high speed, compactness and integration, wherein the oil cooling motor has obvious advantages compared with the traditional water cooling motor in the aspects of integration level, power density, high rotation speed and the like, so that the oil cooling motor is the main direction of the development of the current electric driving system. The motor of the oil-cooled electric drive system is lubricated and cooled by the same oil liquid as the gear box, so that the electric drive system needs to arrange an oil pump to output the system oil liquid to the gear box and the motor respectively. Because the working conditions of the large heating value of the motor and the gear box are not completely consistent, the heating value of the gear box is larger under the high rotating speed, and the heating value of the motor is larger under the high power, under different working conditions, the cooling flow requirements of the motor and the gear box are different, and the current oil cooling electric driving system cannot dynamically distribute the lubrication flow under different working conditions due to the limitation of an initial structure. Disclosure of Invention The invention mainly aims to provide a flow distribution device, an electric driving system and a vehicle, so as to solve the problem that the electric driving system in the prior art cannot dynamically distribute lubrication flow under different working conditions. In order to achieve the above purpose, according to one aspect of the present invention, there is provided a flow distribution device, including a housing, in which at least one oil inlet chamber and a plurality of oil return chambers are provided, the oil inlet chamber is provided with a plurality of oil passages, a valve core slidably disposed in the oil inlet chamber, and temperature memory springs, in which a temperature memory spring is correspondingly disposed in each oil return chamber, the plurality of temperature memory springs being connected to the valve core, the temperature memory springs controlling the valve core to slide in the oil inlet chamber based on the oil temperature so as to adjust the flow rate of cooling oil in the plurality of oil passages. Further, the plurality of oil ways comprise a first oil way, a second oil way and a third oil way, the first oil way and the second oil way are arranged side by side along the radial direction of the shell, the first oil way and the second oil way are all arranged along the axial direction of the shell in an extending mode, the first oil way is provided with a first inlet, the second oil way is provided with a second inlet, and the first oil way, the second oil way and the third oil way are arranged through oil inlet cavity communication. Further, the end faces of the first end and the second end of the valve core are respectively provided with a separation part, the separation parts are used for separating the oil inlet cavity from the oil return cavity, and the separation parts are of annular structures. Further, a first valve port is formed in one end of the valve core, a second valve port is formed in the other end of the valve core, and in the sliding process of the valve core in the oil inlet cavity, the first valve port is matched with the first inlet, and the second valve port is matched with the second inlet so as to adjust the overflow of the first inlet and the second inlet. Further, the number of the oil inlet cavities is one, the number of the oil return cavities is two, the oil inlet cavities are positioned between the two oil return cavities, and the oil inlet cavities and the oil return cavities are all arranged in an extending mode along the radial direction of the shell. Further, two oil return cavities are provided with a return oil way, the return oil way extends along the axial direction of the shell, and the return oil way is communicated with the oil return cavity and is provided with an oil return inlet and an oil return outlet. Further, the valve core is of a columnar structure. Further, a communication channel is arranged between the oil inlet cavity and the oil return cavity, a stop ring is arranged in the communication channel, the inner diameter of the stop ring is smaller than the outer diameter of the valve core, one end of the temperature memory spring is abutted with the inner wall of the oil return cavity, and the other end of the temperature memory spring penetrates through the stop ring to be abutted with the valve core. According to another aspect of the present invention there is provided an electric drive system comprising