Reduction gear, electric axle drive system and electrically driven vehicle

Abstract

The application provides a reducer, an electric bridge driving system and an electric driving vehicle. The reducer comprises a gear assembly (5), an oil collector (4) connected to the gear assembly (5), the oil collector (4) being annular and capable of rotating together with the gear assembly (5), and an oil pipe (3) comprising an axial section (31) and a circumferential section (32), the axial section (31) and the circumferential section (32) being connected, the axial section (31) extending along an axial direction (A) of the oil collector (4) as a whole, the circumferential section (32) extending along a circumferential direction (C) of the oil collector (4) as a whole, and one end of the circumferential section (32) pointing to an inner circumferential part of the oil collector (4), so that oil flowing out of the circumferential section (32) can be received by the oil collector (4).

Description

Technical Field

[0001] This application relates to a speed reducer, an electric axle drive system, and an electric drive vehicle. Background Technology

[0002] In one possible electric bridge drive system, oil can be pumped along the axial direction of the electric bridge drive system to an oil collector by an oil pump. The oil enters the oil collector and is driven to rotate by the oil collector. Then, the oil is supplied to gears and / or bearings for lubrication through hollow shaft pins.

[0003] However, when the oil is pumped to the oil collector, it only has axial velocity and zero circumferential velocity. The oil gains circumferential velocity through the rotation of the oil collector, which causes the electric bridge drive system to lose some power. Summary of the Invention

[0004] This application aims to provide a speed reducer in which oil lubrication has a relatively small impact on the speed reducer's efficiency. This application also proposes an electric bridge drive system with high power efficiency.

[0005] This application provides a speed reducer, comprising:

[0006] Gear assembly;

[0007] An oil collector, wherein the oil collector is annular and connected to the gear assembly, and the oil collector is capable of rotating together with the gear assembly; and

[0008] The oil pipe includes an axial section and a circumferential section, and the axial section and the circumferential section are connected.

[0009] The axial section extends along the axial direction of the oil collector as a whole.

[0010] The circumferential section extends circumferentially along the oil collector.

[0011] One end of the circumferential section points to the inner circumference of the oil collector, so that the oil flowing out through the circumferential section can be received by the oil collector.

[0012] In at least one possible implementation, the circumferential segment extends circumferentially along the oil collector and axially along the oil collector.

[0013] In at least one possible implementation, the oil pipe is located at the top of the oil collector.

[0014] In at least one possible implementation, when viewed along the axial direction of the oil collector, the circumferential segment extends in a horizontal direction.

[0015] In at least one possible embodiment, the axial section of the oil collector has a U-shaped portion, the opening of the U-shaped portion facing the radially inward side of the oil collector, and one end of the circumferential section pointing to the bottom of the U-shaped portion.

[0016] In at least one possible implementation, the gear assembly is a planetary gear assembly, and the oil collector is connected to the planetary gear carrier of the planetary gear assembly.

[0017] This application also proposes an electric bridge drive system, which includes a motor and a reducer as described in any of the above technical solutions.

[0018] In at least one possible implementation, an oil pump is also included, with the other end of the oil pipe connected to the oil outlet of the oil pump.

[0019] This application also proposes an electric drive vehicle that includes the reducer described in any of the above-described technical solutions.

[0020] In at least one possible implementation, one end of the circumferential segment points downstream of the direction of rotation of the oil collector as the vehicle moves forward.

[0021] By adopting the above technical solution, the oil transported through the oil pipe has both axial and circumferential speeds, thereby avoiding or reducing the need for the oil collector to drive the oil to obtain circumferential speed, reducing the power loss of the reducer, and improving the transmission efficiency. Attached Figure Description

[0022] Figure 1 A cross-sectional view of a partial structure of an electric bridge drive system according to an embodiment of this application is shown.

[0023] Figure 2 A schematic diagram of a partial structure of an electric bridge drive system according to an embodiment of this application is shown.

[0024] Figure 3 A schematic diagram of the internal structure of an electric bridge drive system according to an embodiment of this application is shown.

[0025] Figure 4 It shows along Figure 3 A cross-sectional view of line BB.

[0026] Explanation of reference numerals in the attached figures

[0027] 1. Gearbox housing

[0028] 2 Output shaft

[0029] 3. Oil pipe 31. Axial section 32. Circumferential section

[0030] 4 oil collectors

[0031] 5 Gear Assembly 51 Planetary Gear Carrier

[0032] S-Motor Shaft

[0033] A-axis and C-circumferential direction Detailed Implementation

[0034] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0035] It is understandable that the axial direction A of the oil collector 4 is consistent with the axial direction A of the electric bridge drive system, and the circumferential direction C of the oil collector 4 is consistent with the circumferential direction C of the electric bridge drive system.

[0036] like Figures 1 to 4 As shown, an embodiment of this application proposes an electric drive vehicle that includes an electric axle drive system.

[0037] An electric bridge drive system includes a motor and a reducer. The motor shaft S can be connected to the reducer, thereby transmitting the power output from the motor to the reducer or transmitting the rotation of the reducer to the motor. The motor shaft S can be a hollow shaft.

[0038] The reducer includes a reducer housing 1, an output shaft 2 (one half shaft), an oil pipe 3, an oil collector 4, a gear assembly 5, and an oil pump. The oil collector 4 and the gear assembly 5 can be located inside the reducer housing 1.

[0039] Gear assembly 5 can be a planetary gear assembly, which may include a sun gear, planet gears, a planet carrier 51, and a ring gear. The sun gear may be connected to or formed on the motor shaft S. The output shaft 2 and the motor shaft S are coaxially arranged, and the motor shaft S may be fitted radially outside the output shaft 2. The planet gears can be mounted on the planet carrier 51 via hollow pins, and the hollow pins may be provided with oil holes for supplying oil to the planet gears and the bearings on which the planet gears are mounted.

[0040] The oil collector 4 can be connected to the planetary gear carrier 51 of the gear assembly 5. The oil collector 4 can rotate together with the gear assembly 5, and more specifically, it can rotate together with the planetary gear carrier 51. The oil collector 4 can be annular and can be located on one axial side of the planetary gear carrier 51.

[0041] The oil pump can be connected to the reducer housing 1, and the oil inside the reducer housing 1 can flow to the oil pump.

[0042] One end of the oil pipe 3 points to the inner circumference of the oil collector 4, and the other end of the oil pipe 3 is connected to the oil outlet of the oil pump. The oil pump can pump oil to the oil collector 4 through the oil pipe 3, so that the oil collector 4 can receive the oil and distribute it to the planetary gears and the bearings on which the planetary gears are installed through the hollow pin.

[0043] Understandable, Figure 3 Only a portion of the oil pipe 3 is shown in the figure. In reality, the oil pipe 3 can be connected to the oil pump. The part of the oil pipe 3 connected to the oil pump is not shown in the figure, and the oil pump is not shown either.

[0044] like Figure 4 As shown, the oil pipe 3 includes an axial section 31 and a circumferential section 32. The axial section 31 extends along the axial direction A of the electric bridge drive system, and the circumferential section 32 extends generally along the circumferential direction C of the electric bridge drive system. Optionally, the circumferential section 32 can extend along both the circumferential direction C and the axial direction A of the electric bridge drive system. One end of the circumferential section 32 can point towards the inner circumference of the oil collector 4.

[0045] The axial section of the oil collector 4 may have a U-shaped part, with the opening of the U-shaped part facing the radial inner side of the oil collector 4, and one end of the circumferential section 32 pointing to the bottom of the U-shaped part, so that the oil collector 4 can easily receive oil.

[0046] like Figure 3 As shown, the oil pipe 3 can be located at the upper part of the oil collector 4. Observing along the axial direction A of the oil collector 4, the circumferential section 32 can extend horizontally.

[0047] The oil can have axial velocity when passing through the axial section 31, and circumferential velocity (or tangential velocity) when passing through the circumferential section 32. The oil flowing to the oil collector through the oil pipe 3 has both axial velocity and circumferential velocity (or tangential velocity).

[0048] Viewed along the axial direction A of the electric bridge drive system, the circumferential segment 32 can be either circularly extended or linearly extended. (Refer to...) Figure 3 In this embodiment, when viewed along the axial direction A of the electric bridge drive system, the circumferential segment 32 can be a straight line extending along the tangent direction of the oil pipe 3 on the circumference of the oil collector 4.

[0049] One end of the circumferential section 32 points downstream of the direction of rotation of the oil collector 4 when the vehicle is moving forward. When the electrically driven vehicle is moving forward, the oil flowing out of the circumferential section 32 in the circumferential direction C of the electric axle drive system flows in the same direction as the rotation of the oil collector 4, giving the oil a certain initial velocity and improving the efficiency of the electric axle drive system when the vehicle is moving forward. (Refer to...) Figure 3 When the electric vehicle is traveling in the forward direction, the planetary gear carrier 51 and the oil collector 4 can rotate clockwise, with one end of the circumferential section 32 pointing to the downstream side in the clockwise direction.

[0050] The electric bridge drive system of this application can guide the oil through the oil pipe 3 so that the oil flowing towards the oil collector 4 has both axial and circumferential (or tangential) speeds. This eliminates the need for the oil collector to rotate to accelerate the oil and achieve circumferential speed, thereby reducing energy loss and increasing the transmission efficiency of the electric bridge drive system (for example, increasing the transmission efficiency from 98% to 98.2% compared to the prior art). Furthermore, one end of the circumferential section 32 points towards the bottom of the U-shaped portion of the oil collector 4, allowing the oil collector 4 to easily collect the oil and improving the lubrication performance of the gears and bearings in the electric bridge drive system.

[0051] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0052] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0053] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0055] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. A speed reducer, characterized in that, include: Gear assembly (5); Oil collector (4), the oil collector (4) is annular, the oil collector (4) is connected to the gear assembly (5), and the oil collector (4) can rotate together with the gear assembly (5); as well as Oil pipe (3), the oil pipe (3) includes an axial section (31) and a circumferential section (32), the axial section (31) and the circumferential section (32) are connected. The axial section (31) extends generally along the axial direction (A) of the oil collector (4). The circumferential segment (32) extends along the circumferential direction (C) of the oil collector (4) as a whole. One end of the circumferential section (32) points to the inner circumference of the oil collector (4), so that the oil flowing out through the circumferential section (32) can be received by the oil collector (4).

2. The reducer according to claim 1, characterized in that, The circumferential segment (32) extends along the circumferential (C) direction of the oil collector (4) and along the axial (A) direction of the oil collector (4).

3. The reducer according to claim 1, characterized in that, The oil pipe (3) is located above the oil collector (4).

4. The reducer according to claim 1, characterized in that, Viewed along the axial direction (A) of the oil collector (4), the circumferential section (32) extends in the horizontal direction.

5. The reducer according to claim 1, characterized in that, The axial section of the oil collector (4) has a U-shaped portion, the opening of the U-shaped portion faces the radial inner side of the oil collector (4), and one end of the circumferential section (32) points to the bottom of the U-shaped portion.

6. The reducer according to claim 1, characterized in that, The gear assembly (5) is a planetary gear assembly, and the oil collector (4) is connected to the planetary gear carrier (51) of the planetary gear assembly.

7. An electric bridge drive system, characterized in that, Includes an electric motor and a speed reducer as described in any one of claims 1 to 6.

8. The bridge drive system according to claim 7, characterized in that, It also includes an oil pump, with the other end of the oil pipe (3) connected to the oil outlet of the oil pump.

9. An electric-driven vehicle, characterized in that, The reducer includes any one of claims 1 to 6.

10. The electric drive vehicle according to claim 9, characterized in that, One end of the circumferential section (32) points downstream of the direction of rotation of the oil collector (4) when the vehicle moves forward.

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