Electrically-driven main reducer assembly of integrated power takeoff and axle of electrically-driven main reducer assembly

Abstract

The utility model discloses an electrically-driven main speed reducer assembly of an integrated power takeoff and an axle of the electrically-driven main speed reducer assembly. The electrically-driven main speed reducer assembly comprises a power takeoff power transmission module arranged in a speed reducer shell and a power takeoff unit arranged on the outer side of the speed reducer shell and connected with the power takeoff power transmission module. The power transmission module comprises a central shaft, the central shaft is movably connected to the speed reducer shell, one end of the central shaft is fixed to the fixed shaft, and a power take-off transmission gear and a power transmission module are arranged on the central shaft; the power take-off transmission gear is meshed with the speed reducer transmission gear through a gear on the outer ring and matched with a spline on the power transmission module through an outer spline on the extending face of the inner ring. A rotor oil pump is fixed to the other end of the central shaft and provided with an oil suction pipe and a lubricating oil pipe. The rotor oil pump is arranged at the end of the central shaft, when the central shaft rotates, the rotor oil pump is started at the same time, lubricating oil is conveyed to the gear meshing portion of the speed reducer through the oil suction pipe and the lubricating oil pipe, and efficient lubrication of the speed reducer is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of integrated electric drive axles, in particular to an electric drive main reducer assembly with an integrated power take-off and an axle thereof. Background Art

[0002] With the continuous improvement of the penetration rate of new energy in commercial vehicles, especially in typical special markets such as sanitation and mixer trucks, new energy commercial vehicles currently have two main drive routes: central electric drive assembly and integrated electric drive axle. Among them, integrated electric drive axle has been more widely used due to its advantages of high efficiency, low energy consumption and high power density. However, due to the limitations of its position in the whole vehicle, conventional integrated electric drive axles often do not consider the use of power take-off devices for special vehicles and reduce the design of power take-off devices, which seriously limits the application and promotion of integrated electric drive axles in the market. The existing method is to integrate the power take-off device through a simple mechanical connection. This method can meet the basic needs of use in terms of function, but it is difficult to solve the problem of gear lubrication of electric drive axles under high load conditions, which can easily cause gear meshing erosion and lead to axle transmission failure. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the utility model provides an electric drive main reducer assembly with an integrated power take-off and an axle thereof. The technical problems to be solved by the utility model are achieved through the following technical solutions:

[0004] An electric drive main reducer assembly with integrated power take-off includes a power take-off power transmission module arranged in a reducer housing and a power take-off unit arranged outside the reducer housing; the power take-off unit is connected to the power take-off power transmission module through a fixed shaft at its end;

[0005] The power transmission module includes a central shaft, which is movably connected to the reducer housing, and one end of the central shaft is fixed to the fixed shaft; a power take-off transmission gear and a power transmission module are arranged on the central shaft, and the power take-off transmission gear is movably sleeved on one end of the central shaft close to the fixed shaft, and one axial side of the power take-off transmission gear is positioned by a shaft shoulder arranged on the central shaft, and the other axial side is positioned by being in contact with the power transmission module; the outer ring of the power take-off transmission gear is provided with a gear, the inner ring surface extends outward, and an external spline is arranged on the extension surface, and the power take-off transmission gear is meshed with the reducer transmission gear through the gear of the outer ring, and cooperates with the spline on the power transmission module through the external spline on the extension surface of the inner ring;

[0006] A rotor oil pump is fixed to the other end of the central shaft, and an oil suction pipe and a lubricating oil pipe are arranged on the rotor oil pump.

[0007] Furthermore, the power transmission module includes a power transmission ring, a sliding engagement sleeve and a shift fork. The power transmission ring is mounted on the central shaft through a spline sleeve. The sliding engagement sleeve is located at the outer periphery of the power transmission ring and engages with the power transmission ring through a spline. The shift fork is clamped on the sliding engagement sleeve. Under the action of the shift fork, the sliding engagement sleeve can move axially along the power transmission ring until it engages with the external spline on the inner ring extension surface of the power take-off transmission gear. A pressure switch is provided on the shift fork, and an external power source controls the pressure switch. The pressure switch controls the shift fork to drive the sliding engagement sleeve to achieve axial operation.

[0008] Furthermore, a limiting block is provided on the central axis on one axial side of the power transmission ring, and the other side is attached to the power take-off transmission gear. The limiting block is used to limit one axial side of the power transmission ring, and the power take-off transmission gear is used to limit the other axial side.

[0009] Preferably, one end of the central shaft has a mounting groove, the inner cavity of the mounting groove has an internal spline, the end of the fixed shaft has an external spline, and the central shaft is fixed to the external spline of the fixed shaft through the internal spline.

[0010] Furthermore, a sliding assembly is provided between the power take-off transmission gear and the central shaft.

[0011] Preferably, the sliding component is a single-row needle roller bearing, a multi-row needle roller bearing, a sliding bearing or a bushing.

[0012] Another embodiment of the utility model further discloses an electric drive axle, comprising the electric drive main reducer assembly with integrated power take-off as described in any of the above embodiments.

[0013] Beneficial effects of the utility model:

[0014] 1. The utility model sets the power take-off inside the reducer housing and arranges the structure reasonably. It uses the external gas circuit or hydraulic oil circuit of the vehicle. Under the action of the pressure switch, the shift fork pushes the axial movement of the sliding engagement sleeve to realize the power transmission and disconnection between the main reducer transmission gear and the power take-off transmission gear, thereby realizing the power on and off of the external power take-off device. The structure is simple and the operation is convenient. The reducer can be maintained together without separate maintenance.

[0015] 2. By setting a rotor oil pump at the end of the central shaft, when the central shaft rotates, the rotor oil pump starts at the same time, and accurately delivers the lubricating oil to the gear meshing part of the reducer through the oil suction pipe and the lubricating oil pipe, so as to achieve efficient lubrication of the reducer, thereby effectively improving the performance and reliability of the product.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the power taking part of the utility model;

[0018] Figure 2 It is a cross-sectional structural schematic diagram of the utility model installed on the reducer assembly;

[0019] Figure 3 It is a schematic diagram of the exploded structure of the power transmission module of the power take-off;

[0020] Figure 4 It is a structural schematic diagram of the electric drive main reducer assembly;

[0021] Figure 5 Schematic diagram of the structure of the electric drive axle.

[0022] Description of reference numerals:

[0023] 1-connecting plate; 2-external power take-off unit; 3-central shaft; 4-first bearing; 5-second bearing; 6-power take-off transmission gear; 7-power transmission module; 8-rotor oil pump; 9-reducer assembly; 10-limit block; 11-sliding component; 12-bridge housing assembly; 13-wheel side assembly; 9-1-reducer housing; 9-2-reducer transmission gear; 2-1-fixed shaft; 6-1-external spline; 8-1-rotor shaft; 8-2-oil suction pipe; 8-3-lubricating oil pipe; 7-1-power transmission ring; 7-2-sliding engagement sleeve; 7-3-shift fork; 7-4-pressure switch. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with specific embodiments, but the implementation methods of the present invention are not limited thereto.

[0025] Example 1

[0026] See also Figure 1~Figure 4 The embodiment of the utility model provides an electric drive main reducer assembly with an integrated power take-off, specifically including a power take-off power transmission module arranged in a reducer housing 9-1 and an external power take-off unit 2 fixed to the outside of the reducer housing 9-1 by bolts through a connecting plate 1; the connecting plate 2 is a metal bending part or a high-strength non-metallic material part, and the external power take-off unit 2 is connected to the power take-off power transmission module through a fixed shaft 2-1 at its end; specifically, the external power take-off unit 2 is generally a component of the upper part that requires power.

[0027] The power transmission module of the power take-off includes a central shaft 3, and the two ends of the central shaft 3 are connected to the reducer housing 9-1 through a first bearing 4 and a second bearing 5 respectively, so that its rotation is not affected; one end of the central shaft 3 is fixed to the fixed shaft 2-1; a power take-off transmission gear 6 and a power transmission module 7 are provided on the central shaft 3, and the power take-off transmission gear 6 is movably sleeved on one end of the central shaft 3 close to the fixed shaft 2-1, and one axial side thereof is positioned by a shoulder provided on the central shaft 3, and the other axial side is in contact with the power transmission module 7, and the other axial side of the power take-off transmission gear 6 is positioned by the power transmission module 7; the outer ring of the power take-off transmission gear 6 is provided with a gear, the inner ring surface extends outward, and an external spline 6-1 is provided on the extension surface, and the power take-off transmission gear 6 is meshed with the reducer transmission gear 9-2 through the gear of the outer ring, and cooperates with the spline on the power transmission module 7 through the external spline 6-1 on the extension surface of the inner ring to realize power transmission and disconnection.

[0028] When the power take-off unit 2 needs to take power, the power is transmitted to the power take-off transmission gear 6 through the reducer transmission gear 9-2, and the power take-off transmission gear 6 transmits the power to the power transmission module 7. The power transmission module 7 then transmits the power to the central shaft 3. The central shaft 3 transmits the power to the power take-off unit through the fixed shaft 2-1, so that it realizes the corresponding mechanical operation.

[0029] The other end of the central shaft 3 is fixed with a rotor oil pump 8 through the rotor shaft 8-1, and the rotor oil pump 8 is provided with an oil suction pipe 8-2 and a lubricating oil pipe 8-3. The central shaft 3 transmits power to the rotor oil pump 8 through the rotor shaft 8-1, so that the oil suction pipe 8-2 sucks the lubricating oil in the main reducer assembly and delivers it to the part that needs lubrication in the reducer assembly 9 where the power take-off power transmission module is located through the lubricating oil pipe 8-3.

[0030] Furthermore, the power transmission module 7 includes a power transmission ring 7-1, a sliding engagement sleeve 7-2 and a shift fork 7-3. The power transmission ring 7-1 is mounted on the central shaft 3 through a spline sleeve. The sliding engagement sleeve 7-2 is located on the outer periphery of the power transmission ring 7-1 and engages with the power transmission ring 7-1 through a spline. The shift fork 7-3 is clamped on the sliding engagement sleeve 7-2. Under the action of the shift fork 7-3, the sliding engagement sleeve 7-2 can move axially along the power transmission ring 7-1 to engage with the external spline 6-1 on the inner ring extension surface of the power take-off transmission gear 6, thereby performing a power take-off process. A pressure switch 7-4 is provided on the shift fork 7-3. The pressure switch 7-4 can specifically be a pneumatic piston. An external power source pushes the pneumatic piston to drive the shift fork 7-3 to move axially, so that the sliding engagement sleeve 7-2 moves synchronously to engage with or separate from the external spline 6-1 on the inner ring extension surface of the power take-off transmission gear 6.

[0031] Furthermore, in order to prevent the shift fork 7-3 from moving with the sliding engagement sleeve 7-2, and the power transmission ring 7-1 below from moving together, if it is impossible to ensure that the power transmission ring 7-1 and the sliding engagement sleeve 7-2 can slide at the same time, which may cause problems such as power failure and excessive noise, a limit block 10 is provided on the central shaft 3 on one axial side of the power transmission ring 7-1, and the other side is in contact with the power take-off transmission gear 6. The limit block 10 is used to limit one axial side of the power transmission ring 7-1, and the power take-off transmission gear 6 is used to limit the other axial side of the power transmission ring 7-1, so that the shift fork 7-3 can drive the sliding engagement sleeve 7-2 to accurately engage with the power take-off transmission gear 6 for power transmission.

[0032] Preferably, one end of the central shaft 3 has a mounting groove, the inner cavity of the mounting groove has an internal spline, and the end of the fixed shaft 2-1 has an external spline, and the internal spline is meshed with the external spline, so that the central shaft 3 and the fixed shaft 2-1 are radially fixed, and the fixed shaft 2-1 is driven to rotate together when the central shaft 3 rotates. This connection method can prevent the central shaft 3 and the fixed shaft 2-1 from rotating relative to each other, ensure the reliability of force transmission, and have high transmission efficiency.

[0033] Furthermore, a sliding assembly 11 is provided between the power take-off transmission gear 6 and the central shaft 3. The sliding assembly 11 is a single-row needle roller bearing, a multi-row needle roller bearing, a sliding bearing or a bushing. By providing the sliding assembly 11, when power take-off is not required, the rotation of the power take-off transmission gear 6 will not be directly transmitted to the central shaft 3.

[0034] The working principle of the utility model is as follows:

[0035] When the power take-off unit 2 needs to take off power, the external power source controls the pressure switch 7-4 to push the fork 7-3, thereby driving the sliding meshing sleeve 7-2 to move axially along the power transfer ring 7-1 to engage with the external spline of the inner ring extension surface of the power take-off transmission gear 6. The reducer transmission gear 9-2 transfers power to the power take-off transmission gear 6, and the power take-off transmission gear 6 transfers power to the sliding meshing sleeve 7-2. The sliding meshing sleeve 7-2 transfers power to the power transfer ring 7-1. The power transfer ring 7-1 transfers power to the central shaft 3. The central shaft 3 finally transfers power to the power take-off unit and the rotor oil pump 8 respectively. The power take-off unit performs corresponding mechanical operations, and the rotor oil pump 8 pumps oil to the parts that need lubrication.

[0036] Example 2

[0037] See also Figure 5An embodiment of the utility model provides an electric drive axle, which includes the electric drive main reducer assembly with integrated power take-off as described in Example 1, and also includes a bridge housing assembly 12 and a wheel side assembly 13. The electric drive main reducer assembly 9 with integrated power take-off is fixed in the middle of the bridge housing assembly 12, and the two ends of the bridge housing assembly 12 are connected to the wheel side assembly 13.

[0038] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An electric drive main reducer assembly with integrated power take-off, characterized in that: It includes a power take-off power transmission module arranged in the reducer housing and a power take-off unit arranged outside the reducer housing; the power take-off unit is connected to the power take-off power transmission module through a fixed shaft at its end; The power transmission module includes a central shaft, which is movably connected to the reducer housing, and one end of the central shaft is fixed to the fixed shaft; a power take-off transmission gear and a power transmission module are arranged on the central shaft, and the power take-off transmission gear is movably sleeved on one end of the central shaft close to the fixed shaft, and one axial side of the power take-off transmission gear is positioned by a shaft shoulder arranged on the central shaft, and the other axial side is positioned by being in contact with the power transmission module; the outer ring of the power take-off transmission gear is provided with a gear, the inner ring surface extends outward, and an external spline is arranged on the extension surface, and the power take-off transmission gear is meshed with the reducer transmission gear through the gear of the outer ring, and cooperates with the spline on the power transmission module through the external spline on the extension surface of the inner ring; A rotor oil pump is fixed to the other end of the central shaft, and an oil suction pipe and a lubricating oil pipe are arranged on the rotor oil pump.

2. The electric drive main reducer assembly with integrated power take-off according to claim 1, characterized in that: The power transmission module includes a power transmission ring, a sliding engagement sleeve and a shift fork. The power transmission ring is mounted on the central shaft through a spline sleeve. The sliding engagement sleeve is located at the outer periphery of the power transmission ring and engages with the power transmission ring through a spline. The shift fork is clamped on the sliding engagement sleeve. Under the action of the shift fork, the sliding engagement sleeve can move axially along the power transmission ring until it engages with the external spline on the inner ring extension surface of the power take-off transmission gear. A pressure switch is provided on the shift fork, and an external power source controls the pressure switch. The pressure switch controls the shift fork to drive the sliding engagement sleeve to achieve axial operation.

3. The electrically driven main reducer assembly with integrated power take-off according to claim 2, characterized in that: A limiting block is arranged on the central axis on one axial side of the power transmission ring, and the other side is in contact with the power take-off transmission gear. The limiting block is used to limit one axial side of the power transmission ring, and the power take-off transmission gear is used to limit the other axial side of the power transmission ring.

4. The electrically driven main reducer assembly with integrated power take-off according to claim 1, characterized in that: One end of the central shaft has a mounting groove, the inner cavity of the mounting groove has an internal spline, the end of the fixed shaft has an external spline, and the central shaft is fixed to the external spline of the fixed shaft through the internal spline.

5. The electrically driven main reducer assembly with integrated power take-off according to claim 1, characterized in that: A sliding assembly is arranged between the power take-off transmission gear and the central shaft.

6. The electrically driven main reducer assembly with integrated power take-off according to claim 5, characterized in that: The sliding component is a single-row needle roller bearing, a multi-row needle roller bearing, a sliding bearing or a bushing.

7. An electric drive axle, characterized in that: An electrically driven main reducer assembly comprising an integrated power take-off as described in any one of claims 1 to 5.

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