Oil pumps for new energy vehicles

Abstract

This utility model discloses an oil pump for new energy vehicles, including a housing, a pump component located within the housing, and an oil flow channel. The oil flow channel includes an oil suction channel, an oil discharge channel, and a cross-flow channel. The oil suction channel is connected to the oil suction side of the pump component, and the oil discharge channel is connected to the oil discharge side of the pump component and is configured to be sealable at least in the opposite direction of oil discharge. The cross-flow channel is connected between the oil suction channel and the oil discharge channel and is configured to be sealable at least in the direction from the oil discharge channel to the oil suction channel. The sealable position of the oil discharge channel is located after the position where the cross-flow channel connects to the oil discharge channel. This utility model prevents the oil pump from dry-running when the reversing motor reverses, thus preventing abnormal noise and vibration. Moreover, it ensures that the moving parts are not without lubrication during reversing, thereby guaranteeing the normal use of the drive system and extending its service life.

Description

Technical Field

[0001] This utility model relates to a component of an automotive lubrication system, and more particularly to an oil pump for new energy vehicles. Background Technology

[0002] The oil pump is a key component for lubricating moving parts in a vehicle, ensuring proper lubrication between them. In existing technologies, the oil pump is typically driven by the main drivetrain. In conventional gasoline-powered vehicles, the mechanical pump relies on the transmission for forward rotation; whether moving forward or backward, the pump's direction remains unchanged. Therefore, the vehicle's motion does not affect the pump's direction, ensuring proper lubrication of the moving parts. However, in increasingly common new energy vehicles, the oil pump is driven by an electric system. Electric hybrid transmissions often have a single-gear configuration, with forward and reverse gears typically achieved by the electric motor's forward and reverse rotation. Therefore, the oil pump also experiences forward and reverse rotation during forward and reverse movements. However, the flow direction of lubricating oil in the driving system is determined by the forward rotation direction of the oil pump, which draws oil from the oil pan and discharges it into the oil passages to distribute it to the parts that need lubrication. During reversing, the direction of the oil pump also changes to reverse, and the pumping method changes to drawing oil from the oil passages to the oil pan. Limited oil in the oil passages can lead to dry friction and wear of the oil pump, resulting in greater noise and vibration. More importantly, the reverse rotation of the oil pump causes the oil passages to be completely drained, resulting in the moving parts operating without oil. Repeated operation will cause greater wear, thereby affecting the service life of the drive system.

[0003] Therefore, it is necessary to improve the existing oil pump or its drive system so that the oil pump will not dry-run when the reversing motor reverses, thus avoiding abnormal noise and vibration. Moreover, the moving parts will not be left without lubrication during reversing, thereby ensuring the normal use of the drive system and extending its service life. Utility Model Content

[0004] In view of this, the present invention provides an oil pump for new energy vehicles. When the reversing motor reverses, the oil pump will not dry-run, thus avoiding abnormal noise and vibration. Moreover, the moving parts will not be without lubrication during the reversing process, thereby ensuring the normal use of the drive system and extending its service life.

[0005] The present invention relates to an oil pump for new energy vehicles, comprising a housing, a pump component located within the housing, and an oil flow channel. The oil flow channel includes an oil suction channel, an oil discharge channel, and a cross-flow channel. The oil suction channel is connected to the oil suction side of the pump component, the oil discharge channel is connected to the oil discharge side of the pump component and is configured to be sealable at least in the opposite direction of oil discharge, and the cross-flow channel is connected between the oil suction channel and the oil discharge channel and is configured to be sealable at least in the direction from the oil discharge channel to the oil suction channel.

[0006] The drain channel is configured to be closed at a location after the cross-flow channel connects to the drain channel.

[0007] Furthermore, the position where the cross-flow channel connects to the oil discharge channel is as close as possible to the oil suction side of the pump component.

[0008] Furthermore, the oil discharge channel is configured to be closable in the opposite direction of oil discharge via an oil discharge check valve; the cross-line channel is configured to be closable in the direction from the oil discharge channel to the oil suction channel via a cross-line check valve.

[0009] Furthermore, the housing includes a pump housing and a base housing, with an oil suction channel, an oil discharge channel and a cross-flow channel disposed in the base housing, and the pump housing is sealed and fastened to the base housing, with the pump components located inside the pump housing.

[0010] Furthermore, the pump component is a cycloidal gear pump component, the pump housing is a disc-shaped structure, and the base housing has an opening for sealing and fastening the pump housing.

[0011] Furthermore, an oil suction chamber communicating with the oil suction channel is provided in the base housing corresponding to the oil suction side of the pump component, and an oil discharge chamber communicating with the oil discharge channel is provided in the base housing corresponding to the oil discharge side of the pump component.

[0012] Furthermore, the pump housing has a stepped shape and is sealed and fastened to the base housing.

[0013] Furthermore, the base shell is U-shaped, and the pump shell is coaxial with the semi-cylinder of the U-shaped body.

[0014] Furthermore, the oil suction channel and the oil discharge channel are parallel and arranged along the length direction of the U-shaped body, and an oil suction interface and an oil discharge interface are formed on the bottom surface of the U-shaped body. The cross-line channel is perpendicular to the oil suction channel and the oil discharge channel.

[0015] Furthermore, the drain check valve and the cross-line check valve are spring-loaded check valves or diaphragm check valves.

[0016] The beneficial effects of this utility model are as follows: The oil pump for new energy vehicles of this utility model adopts a structure with a cross-flow channel between the oil suction channel and the oil discharge channel, and a controllable closure is formed at the set positions of the oil discharge channel and the cross-flow channel. When the vehicle is reversing, the oil pump reverses, and oil is drawn in on the oil discharge side. Since the oil discharge channel is closed, the lubricating oil in the vehicle's lubrication oil passages will not be drawn into the oil pump, thus ensuring the lubrication of the moving parts during reversing. At this time, the cross-flow channel is opened, and the oil in the oil suction channel is drawn into the oil discharge side by the oil pump through the cross-flow channel and discharged to the oil suction side. After the oil in the oil suction channel merges with the oil in the oil pan, it is drawn into the cross-flow channel again, thus forming a circulating oil suction and discharge process in the oil pump. Therefore, when the reversing motor reverses, the oil pump will not dry run, thus avoiding abnormal noise and vibration. Moreover, the moving parts will not be without lubrication during reversing, thus ensuring the normal use of the drive system and extending its service life. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is an isometric view of the present invention;

[0019] Figure 2 This is a cross-sectional view of the basic shell of this utility model;

[0020] Figure 3 This is a cross-sectional view of the present invention at the pump housing;

[0021] Figure 4 This is a schematic diagram of the present invention. Detailed Implementation

[0022] like Figures 1 to 4 As shown: The oil pump for new energy vehicles in this embodiment includes a housing, a pump component 3 located within the housing, and an oil flow channel. The oil flow channel includes an oil suction channel 201, an oil discharge channel 202, and a cross-flow channel 203. The oil suction channel 201 is connected to the oil suction side of the pump component 3. The oil discharge channel 202 is connected to the oil discharge side of the pump component 3 and is configured to be sealable at least in the opposite direction of oil discharge. The cross-flow channel 203 connects the oil suction channel 201 and the oil discharge channel 202 and is configured to be sealable at least in the opposite direction of oil discharge. The direction from the oil drain channel 202 to the oil suction channel 201 is designed to be sealable; the oil channels are opened in the housing using a conventional mechanical structure to satisfy the functions of oil suction and discharge, which will not be elaborated here; the cross-flow channel is also opened in the housing to connect the oil suction channel and the oil drain channel; the housing is structurally sufficient to accommodate the pump components and oil channels, and can be an integral structure or a split structure, which can be achieved through conventional mechanical design methods, which will not be elaborated here.

[0023] The oil drain channel 202 is configured to be closed at a position after the cross-flow channel 203 connects to the oil drain channel 202. "After" means that according to the oil drain direction, the closure position is located after the cross-flow channel connection position. That is, the normal oil drain path must pass through the connection point before reaching the closure position.

[0024] In this structure, during normal vehicle movement, the oil pump operates normally, and the oil flows from the suction side to the discharge side of the pump component 3, forming a normal lubrication process. At this time, the cross-flow channel 203 is closed between the discharge oil passage and the suction oil passage, without interfering with the normal oil flow. When the oil pump reverses during reversing, the discharge side of the pump component 3 draws oil under negative pressure. Since the discharge oil passage is closed, the cross-flow channel is opened, and the pump component 3 draws oil from the discharge side through the cross-flow channel 203 and the suction oil passage 201 from the oil pan to the discharge side and sends it to the suction side, returning to the suction oil passage 201. The specific process of the oil pump during reversing is: suction oil passage 201 → cross-flow channel 203 → discharge side → suction side → suction oil passage 201 → cross-flow channel 203 → suction side. This forms an oil circulation in the oil pump, avoiding dry friction and eliminating all problems caused by dry friction. At the same time, it does not affect the normal lubrication of other lubrication parts of the vehicle during reversing.

[0025] The closable state can be achieved through a one-way valve, which automatically opens and closes according to the direction of oil discharge; it can also be achieved through other electrically controlled valves, which open and close by means of control according to the direction of oil discharge. Both can achieve the purpose of the utility model, and will not be elaborated here. The oil suction side and oil discharge side in this utility model refer to the oil suction and oil discharge positions of the oil pump when it is operating normally during vehicle movement. The same name is used when it is reversed, which does not affect the understanding of the solution, and will not be elaborated here.

[0026] In this embodiment, the position where the cross-flow channel 203 connects to the oil discharge channel 202 is as close as possible to the oil suction side of the pump component. Of course, the position where the oil discharge channel 202 can be closed should be as close as possible to the position connecting to the cross-flow channel 203 to ensure full utilization of negative pressure during reverse rotation and minimal impact on the lubrication of the moving parts; of course, if... Figure 2 As shown, for ease of processing and standardization of oil passage arrangement, the cross-flow channel 203 should be perpendicular to the oil suction channel 201 and the oil discharge channel 202, and should be as close as possible to the oil suction side and oil discharge side of the pump component to ensure full utilization of negative pressure.

[0027] In this embodiment, the oil discharge channel 202 is configured to be sealable in the opposite direction of oil discharge via an oil discharge check valve. The check valve has mechanical automation functions, a simple structure, and low cost. Similarly, the cross-line channel is configured to be sealable in the direction from the oil discharge channel to the oil suction channel via a cross-line check valve, also exhibiting low cost and simple structure. The two check valves can be configured using conventional mechanical methods; they can be installed as a single check valve component within the oil passage, or the flow passage can be used to form a valve seat and corresponding adaptive design, such as... Figure 2 As shown in the figure, the diagram only illustrates the setting of the check valve and is not a machining and assembly diagram. In actual production, there are various machining methods to complete the setting of the check valve, which will not be described in detail here.

[0028] In this embodiment, the housing includes a pump housing 1 and a base housing 2. The oil suction channel 201, the oil discharge channel 202, and the cross-flow channel 203 are disposed in the base housing 2. The pump housing 1 is sealed and fastened to the base housing 2, and the pump component 3 is located inside the pump housing 1. The housing adopts a split structure composed of the pump housing 1 and the base housing 2, which is conducive to the processing of each oil passage, especially the setting of the one-way valve, and of course, it is also conducive to ensuring the installation of the pump component, thereby saving usage and maintenance costs. The seal between the pump housing and the base housing is a typical mechanical static seal design, which will not be described in detail here.

[0029] In this embodiment, the pump component 3 is a cycloidal gear pump component, and the pump housing 1 has a disc-shaped structure, such as... Figure 3 As shown, the pump housing 1 is adapted to the structure of the cycloidal gear pump component and has a disc-shaped structure. It needs to open the necessary power input installation position and form a seal. It belongs to the general mechanical dynamic seal design, which will not be described in detail here. The base shell has an opening for sealing and fastening of the pump housing 1. The structure is simple and compact and the volume is small.

[0030] In this embodiment, an oil suction chamber 204 communicating with the oil suction channel is provided in the base housing 2 corresponding to the oil suction side of the pump component 3, and an oil discharge chamber 205 communicating with the oil discharge channel 202 is provided in the base housing 2 corresponding to the oil discharge side of the pump component 3; these are used to suck in, discharge and store a certain amount of lubricating oil, to ensure the smooth progress of the oil suction and discharge process, and to further avoid dry grinding during reverse rotation.

[0031] In this embodiment, the pump housing 1 has a stepped shape and is sealed and fastened to the base housing 2, such as... Figure 1 As shown, the stepped shape refers to the fact that the radial cross-sectional dimension of the pump housing 1 is adapted to the pump component 3 and is smaller than the cross-sectional dimension of the base housing in this direction. After sealing and fastening, a stepped structure is formed, which makes the entire oil pump compact in size.

[0032] In this embodiment, the base housing 2 is a U-shaped body, and the pump housing 1 is coaxial with the semi-cylinder of the U-shaped body. As shown in the figure, the U-shaped body refers to a three-dimensional structure composed of a cuboid and a semi-cylinder. The pump housing 1 is coaxial with the semi-cylinder and forms a stepped structure, which makes the oil pump more compact and has stronger installation adaptability.

[0033] In this embodiment, as Figure 2 As shown, the oil suction channel 201 and the oil discharge channel 202 are parallel and arranged along the length of the U-shaped body. An oil suction port and an oil discharge port are formed on the bottom surface of the U-shaped body. The bottom surface refers to the surface on the U-shaped body where the cuboid and the semi-cylinder face each other, which will not be described in detail here. The cross-flow channel 203 is perpendicular to the oil suction channel 201 and the oil discharge channel 202. The overall structure is simple and compact and easy to process.

[0034] In this embodiment, the drain check valve and the cross-line check valve are spring-loaded check valves or diaphragm check valves; such as Figure 2 As shown, this embodiment uses a spring-loaded check valve, which utilizes the design of the oil passage itself to form a valve seat. The valve core is sealed against the valve seat by a spring, and opens under pressure to overcome the preload of the spring. This is a typical spring-loaded check valve structure, which will not be described in detail here. This check valve has the advantage of a long service life. On the other hand, the diaphragm safety valve has a simple structure, is easy to install, and has a low cost. It does not have high requirements for orientation during use, but its service life is shorter than that of the spring-loaded safety valve, which will not be described in detail here.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An oil pump for a new energy vehicle, characterized in that: The device includes a housing, a pump assembly located within the housing, and an oil passage. The oil passage includes an oil suction passage, an oil discharge passage, and a cross-flow passage. The oil suction passage is connected to the oil suction side of the pump assembly, the oil discharge passage is connected to the oil discharge side of the pump assembly and is configured to be sealable at least in the opposite direction of oil discharge, and the cross-flow passage is connected between the oil suction passage and the oil discharge passage and is configured to be sealable at least in the direction from the oil discharge passage to the oil suction passage. The drain channel is configured to be closed at a location after the cross-flow channel connects to the drain channel.

2. The oil pump for new energy vehicles according to claim 1, characterized in that: The location where the cross-flow channel connects to the oil discharge channel should be as close as possible to the oil suction side of the pump component.

3. The oil pump for new energy vehicles according to claim 1, characterized in that: The oil discharge channel is configured to be closable in the opposite direction of oil discharge via an oil discharge check valve; the cross-line channel is configured to be closable in the direction from the oil discharge channel to the oil suction channel via a cross-line check valve.

4. The oil pump for new energy vehicles according to claim 1, characterized in that: The housing includes a pump housing and a base housing. The oil suction channel, the oil discharge channel and the cross-flow channel are disposed in the base housing. The pump housing is sealed and fastened to the base housing and the pump components are located inside the pump housing.

5. The oil pump for new energy vehicles according to claim 4, characterized in that: The pump component is a cycloidal gear pump component, the pump housing is a disc-shaped structure, and the base housing has an opening for sealing and fastening the pump housing.

6. The oil pump for new energy vehicles according to claim 4, characterized in that: The base housing has an oil suction chamber corresponding to the oil suction side of the pump component and communicating with the oil suction channel, and an oil discharge chamber corresponding to the oil discharge side of the pump component and communicating with the oil discharge channel.

7. The oil pump for new energy vehicles according to claim 4, characterized in that: The pump housing has a stepped shape and is sealed and fastened to the base housing.

8. The oil pump for new energy vehicles according to claim 5, characterized in that: The base shell is U-shaped, and the pump shell is coaxial with the semi-cylinder of the U-shaped body.

9. The oil pump for new energy vehicles according to claim 8, characterized in that: The oil suction channel and the oil discharge channel are parallel and arranged along the length of the U-shaped body. An oil suction port and an oil discharge port are formed on the bottom surface of the U-shaped body. The cross-line channel is perpendicular to the oil suction channel and the oil discharge channel.

10. The oil pump for new energy vehicles according to claim 3, characterized in that: The drain check valve and the cross-line check valve are spring-loaded or diaphragm-type check valves.

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