Central integrated high-torque driving unit

Abstract

The invention discloses a central integrated type high-torque driving unit. The central integrated type high-torque driving unit comprises two axle shells, a driving motor, a multi-stage speed reducer, a planetary speed reducer and a hub brake disc assembly. The multi-stage speed reducer is arranged between the two axle shells, and the input end of the multi-stage speed reducer is connected with the driving motor; the multi-stage speed reducer comprises a transmission gear; the planetary speed reducers are symmetrically arranged on the two sides of the multi-stage speed reducer, and the planetary speed reducers and the transmission gear are coaxially arranged. The planetary reducer comprises a central gear shaft and a planet carrier assembly. The axle housing is coaxially arranged at one end of the planetary reducer; the hub brake disc assembly is fixedly installed at the end of the axle shell through a bearing and provided with an opening communicating with the axle shell. A half shaft fixedly connected with the planet carrier assembly is fixedly mounted at the opening; and the half shaft blocks the opening. The invention relates to the technical field of vehicle drive axles, and achieves the purpose of meeting the performance requirements of large speed ratio, high torque and high rotating speed on the premise of ensuring that the space size is not interfered.

Description

Technical Field

[0001] The invention belongs to the field of automobiles and relates to vehicle drive axle technology, in particular to a central integrated high-torque drive unit. Background Art

[0002] In traditional conventional drive axle assemblies, a combination of central multi-stage reduction and wheel-side reduction is usually used to achieve a high speed ratio of the drive axle and ensure the reliability of product use under high output torque. However, with the advancement of oil-to-electric projects, many new challenges are faced. When the traditional fuel vehicle platform is transformed into a pure electric drive, the wheel-side reducer cannot be arranged in the tire due to the strict restrictions of the tire size and minimum ground clearance of the whole vehicle. At the same time, when applied to certain special vehicles, due to performance requirements, it has strict requirements on the vehicle space size, ground clearance and traction. For the size of traction, please refer to the excavator in the prior art. According to its own application environment and application scenario requirements, the maximum output torque of the vehicle needs to be greater than 23000N.m, and the total speed reducer ratio needs to be greater than 35, and the maximum motor speed needs to be greater than 7500rpm. In this case, it is difficult for the conventional drive axle structure to meet these requirements at the same time.

[0003] Therefore, there is an urgent need for a centrally integrated high-torque drive unit to solve the above problems. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a central integrated high-torque drive unit to meet the performance requirements of large speed ratio, high torque and high speed under the premise of ensuring that the spatial dimensions do not interfere. The present invention arranges a multi-stage reducer and a planetary reducer, and concentrates the multi-stage reducer and the planetary reducer in the middle position of the bridge housing, that is, by integrating the reducers originally dispersedly arranged in the central position, so as to effectively utilize the space to meet the application requirements of tire size and minimum ground clearance, thereby achieving the purpose of meeting the performance requirements of large speed ratio, high torque and high speed under the premise of ensuring that the spatial dimensions do not interfere.

[0005] To achieve the above-mentioned object, a first aspect of the present invention provides a central integrated high-torque drive unit, comprising two bridge housings, a drive motor, a multi-stage reducer, a planetary reducer and a wheel hub brake disc assembly;

[0006] The multi-stage reducer is arranged between the two bridge housings, and an input end thereof is connected to the driving motor;

[0007] The multi-stage reducer includes a transmission gear for power output;

[0008] The planetary reducers are symmetrically arranged on both sides of the multi-stage reducer and are coaxially arranged with the transmission gear;

[0009] The planetary reducer comprises a central gear shaft connected to the transmission gear and a planet carrier assembly for power output;

[0010] The bridge housing is coaxially arranged at one end of the planetary reducer away from the multi-stage reducer;

[0011] The wheel hub brake disc assembly is fixedly mounted on the end of the bridge housing through a bearing, so that the wheel hub brake disc assembly can rotate relative to the bridge housing;

[0012] The wheel hub brake disc assembly has an opening communicating with the bridge housing, and a half shaft penetrating the bridge housing and extending into the interior of the planetary reducer to be fixedly connected to the planetary carrier assembly is fixedly installed at the opening;

[0013] Wherein, the half shaft blocks the opening.

[0014] Furthermore, the multi-stage reducer also includes two first shells connected to each other and forming a chamber, and a plurality of reduction gears rotatably mounted in the chamber;

[0015] The plurality of reduction gears are meshed in sequence from top to bottom, the reduction gear located at the top is connected to the output end of the driving motor, and the reduction gear located at the bottom is meshed with the transmission gear.

[0016] Furthermore, the planetary reducer includes a second housing and an inner gear ring;

[0017] The second shell is connected to the first shell by a fastener;

[0018] The inner gear ring is fixed inside the second housing;

[0019] The planet carrier assembly and the inner gear ring form a planetary reduction mechanism, and are connected to the transmission gear through the central gear shaft.

[0020] Furthermore, the bridge housing and the second housing are integrally formed.

[0021] Furthermore, a closing disk is provided at one end of the half shaft away from the multi-stage reducer;

[0022] The half shaft is connected to the wheel hub brake disc assembly through the closing disc and blocks the opening.

[0023] Furthermore, the driving motor is fixed to the multi-stage reducer by fasteners;

[0024] Wherein, the driving motor is configured as a high-torque disc motor.

[0025] Furthermore, the wheel hub brake disc assembly includes a wheel hub body and a brake disc body;

[0026] Wherein, the wheel hub body and the brake disc body are integrally formed castings.

[0027] Further, it also includes a brake caliper assembly;

[0028] The brake caliper assembly is fixedly mounted on the outer wall of the bridge housing and is located between the wheel hub brake disc assembly and the planetary reducer.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] By providing a multi-stage reducer and a planetary reducer, and concentrating the multi-stage reducer and the planetary reducer in the middle position of the bridge housing, that is, by integrating the reducers that were originally dispersed in a central position, the space formed by the drive unit is effectively utilized, and a high-performance layout is achieved within a limited size to meet the application requirements of tire size and minimum ground clearance, thereby achieving the purpose of meeting the performance requirements of large speed ratio, high torque and high speed while ensuring that the spatial dimensions do not interfere.

[0031] Furthermore, by combining a multi-stage reducer including a transmission gear, a planetary reducer including a central gear shaft and a planetary carrier assembly, and arranging a half-shaft on the wheel hub brake disc assembly, when the drive motor is running, the power can be transmitted to the wheel hub brake disc assembly in sequence from the transmission gear, the central gear shaft, the planetary carrier assembly and the half-shaft, thereby realizing the driving of the entire vehicle and the terminal of the equipment. Under the action of the multi-stage reducer and the planetary reducer, the performance requirements of the drive unit for large speed ratio, high torque and high speed are effectively met.

[0032] In addition, the half shaft can block the opening of the wheel hub brake disc, so that the bridge housing, the planetary reducer and the multi-stage reducer can form a closed load-bearing housing structure around it, thereby improving the protection effect and strength of the drive unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 is a cross-sectional view of a central integrated high torque drive unit in one embodiment of the present invention;

[0035] Figure 2 1 is a structural exploded diagram of a centrally integrated high-torque drive unit in one embodiment of the present invention.

[0036] Figure Number:

[0037] 1. Bridge housing; 2. Drive motor; 3. Multi-stage reducer; 31. Transmission gear; 32. First housing; 33. Reduction gear; 4. Planetary reducer; 41. Central gear shaft; 42. Planet carrier assembly; 43. Second housing; 44. Internal gear ring; 5. Wheel hub brake disc assembly; 51. Half shaft; 511. Closed disc; 6. Brake caliper assembly. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1 and Figure 2 A first aspect of the present invention provides a central integrated high torque drive unit, including two bridge housings 1, a drive motor 2, a multi-stage reducer 3, a planetary reducer 4 and a wheel hub brake disc assembly 5.

[0040] The multi-stage reducer 3 is disposed between the two bridge housings 1 , and an input end thereof is connected to the drive motor 2 for preliminary deceleration and torque increase.

[0041] The multi-stage reducer 3 includes a transmission gear 31 for power output to transmit power.

[0042] In addition, the planetary reducer 4 is symmetrically arranged on both sides of the multi-stage reducer 3 and is coaxially arranged with the transmission gear 31, so that the input end of the planetary reducer 4 can be connected to the transmission gear 31, thereby completing the power transmission and completing the secondary deceleration and torque increase through the planetary reducer 4 to meet the high torque application requirements of the drive unit.

[0043] Specifically, the planetary reducer 4 includes a central gear shaft 41 connected to the transmission gear 31 and a planetary carrier assembly 42 for power output.

[0044] In this embodiment, the bridge housing 1 is coaxially arranged at an end of the planetary reducer 4 away from the multi-stage reducer 3 .

[0045] The wheel hub brake disc assembly 5 is fixedly mounted on the end of the bridge housing 1 through a bearing, so that the wheel hub brake disc assembly 5 can rotate relative to the bridge housing 1. Even when power is output to the wheel hub brake disc assembly 5, it can drive the wheel hub brake disc assembly 5 to rotate and realize normal movement function.

[0046] Among them, the wheel hub brake disc assembly 5 has an opening connected to the bridge housing 1, and a half-shaft 51 is fixedly installed at the opening, which passes through the bridge housing 1 and extends to the inside of the planetary reducer 4 to be fixedly connected to the planetary carrier assembly 42, that is, the power is transmitted to the transmission gear 31, the central gear shaft 41, the planetary carrier assembly 42 and the half-shaft 51 in sequence through the drive motor 2, thereby completing the drive of the whole vehicle and the end of the equipment.

[0047] It should be particularly noted that the half shaft 51 blocks the opening, so that the bridge housing 1, the planetary reducer 4 and the multi-stage reducer 3 can form a closed load-bearing housing structure around it, thereby improving the protection effect and strength of the drive unit.

[0048] The device is provided with a multi-stage reducer 3 and a planetary reducer 4, and the multi-stage reducer 3 and the planetary reducer 4 are concentrated in the middle position of the bridge housing 1, that is, by integrating the reducers originally dispersedly arranged in the central position, the space formed by the drive unit is effectively utilized, and a high-performance layout is achieved in a limited size to meet the application requirements of tire size and minimum ground clearance, thereby achieving the purpose of meeting the performance requirements of large speed ratio, high torque and high speed while ensuring that the space size does not interfere.

[0049] Furthermore, by providing a multi-stage reducer 3 including a transmission gear 31, a planetary reducer 4 including a central gear shaft 41 and a planetary carrier assembly 42, and a half shaft 51 on the wheel hub brake disc assembly 5, when the drive motor is running, the power can be sequentially transmitted from the transmission gear 31, the central gear shaft 41, the planetary carrier assembly 42 and the half shaft 51 to the wheel hub brake disc assembly 5, thereby realizing the driving of the entire vehicle and the terminal of the equipment, and under the action of the multi-stage reducer 3 and the planetary reducer 4, the performance requirements of the drive unit for large speed ratio, high torque and high speed are effectively met.

[0050] In a further embodiment, the multi-stage reducer 3 is further limited to enhance the effect of reducing speed and increasing torque.

[0051] Specifically, the multi-stage reducer 3 further includes two first housings 32 that are interconnected and form a chamber, and a plurality of reduction gears 33 rotatably mounted in the chamber.

[0052] Among them, the multiple reduction gears 33 are meshed in sequence from top to bottom, the reduction gear 33 located at the top is connected to the output end of the drive motor 2, and the reduction gear 33 located at the bottom is meshed with the transmission gear 31 to realize the sequential transmission of power, and under the action of the multiple reduction gears 33, the function of initial deceleration and torque increase is completed.

[0053] In other embodiments, the multi-stage reducer 3 also includes a differential assembly, which can realize modular adjustment of the multi-stage reducer 3 while ensuring the customer's requirements for large speed ratio and high torque. That is, by adjusting the number of teeth of multiple reduction gears 33, the required ratio width range can be adjusted on the basis of minimizing the spatial size.

[0054] In a further embodiment, the planetary reducer 4 is further limited to better cooperate with the multi-stage reducer 3 to complete the secondary reduction and torque increase function.

[0055] Specifically, the planetary reducer 4 includes a second housing 43 and an inner gear ring 44 .

[0056] The second housing 43 is connected to the first housing 32 via fasteners, and the inner gear ring 44 is fixed inside the second housing 43 .

[0057] Among them, the planetary carrier assembly 42 and the inner ring gear 44 constitute a planetary reduction mechanism, and are connected to the transmission gear 31 through the central gear shaft 41, thereby realizing the function of secondary reduction and torque increase, achieving the purpose of increasing torque, and through the direct drive design layout, the space occupancy is smaller and the layout is more compact.

[0058] In this embodiment, the bridge housing 1 and the second housing 43 are integrally formed.

[0059] In other embodiments, in order to facilitate the sealing of the wheel hub brake disc assembly 5 through the half shaft 51, the bridge housing 1, the planetary reducer 4 and the multi-stage reducer 3 can better surround and form a closed load-bearing housing structure.

[0060] Specifically, a closing disk 511 is provided at one end of the half-shaft 51 away from the multi-stage reducer 3. The half-shaft 51 is connected to the wheel hub brake disk assembly 5 through the closing disk 511 and blocks the opening to achieve the output of the power end and the sealing function of the inner enclosed space (i.e., the load-bearing shell structure).

[0061] In other embodiments, the drive motor 2 is fixed to the multi-stage reducer 3 by fasteners. The drive motor 2 is configured as a high-torque disc motor, which is more conducive to meeting the application requirements of high-torque working conditions in a small space due to its smaller axial size.

[0062] In a further embodiment, a specific wheel hub brake disc assembly 5 is also proposed to avoid the problem of increase in the space required for their installation due to the transition size between the two.

[0063] Specifically, the wheel hub brake disc assembly 5 includes a wheel hub body and a brake disc body. The wheel hub body and the brake disc body are integrally molded castings, that is, the influence of the transition size on the space required for its installation is reduced by integrally molding and casting, so as to meet the requirements of the tire size and minimum ground clearance of the applied vehicle.

[0064] In other embodiments, the central integrated high torque drive unit further includes a brake caliper assembly 6 .

[0065] Among them, the brake caliper assembly 6 is fixedly installed on the outer wall of the bridge housing 1 and is located between the wheel hub brake disc assembly 5 and the planetary reducer 4, realizing the function of braking the drive unit, that is, through the arrangement of multiple pairs of brake calipers on a single side, the demand for equipment braking force in a small space is met.

[0066] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A centrally integrated high torque drive unit, characterized in that: It comprises two bridge housings (1), a drive motor (2), a multi-stage reducer (3), a planetary reducer (4) and a wheel hub brake disc assembly (5); The multi-stage reducer (3) is arranged between the two bridge housings (1), and an input end is connected to the drive motor (2); The multi-stage reducer (3) comprises a transmission gear (31) for power output; The planetary reducer (4) is symmetrically arranged on both sides of the multi-stage reducer (3), and is coaxially arranged with the transmission gear (31); The planetary reducer (4) comprises a central gear shaft (41) connected to the transmission gear (31) and a planetary carrier assembly (42) for power output; The bridge housing (1) is coaxially arranged at one end of the planetary reducer (4) away from the multi-stage reducer (3); The wheel hub brake disc assembly (5) is fixedly mounted on the end of the bridge housing (1) via a bearing, so that the wheel hub brake disc assembly (5) can rotate relative to the bridge housing (1); The wheel hub brake disc assembly (5) has an opening communicating with the bridge housing (1), and a half shaft (51) is fixedly installed at the opening and passes through the bridge housing (1) and extends into the interior of the planetary reducer (4) to be fixedly connected to the planet carrier assembly (42); Wherein, the half shaft (51) blocks the opening.

2. A centrally integrated high torque drive unit according to claim 1, characterized in that: The multi-stage reducer (3) further comprises two first housings (32) connected to each other and forming a chamber, and a plurality of reduction gears (33) rotatably mounted in the chamber; The plurality of reduction gears (33) are meshed in sequence from top to bottom, the reduction gear (33) located at the top is connected to the output end of the drive motor (2), and the reduction gear (33) located at the bottom is meshed with the transmission gear (31).

3. A centrally integrated high torque drive unit according to claim 2, characterized in that: The planetary reducer (4) comprises a second housing (43) and an inner gear ring (44); The second shell (43) is connected to the first shell (32) via a fastener; The inner gear ring (44) is fixed inside the second housing (43); The planet carrier assembly (42) and the inner gear ring (44) form a planetary reduction mechanism and are connected to the transmission gear (31) via the central gear shaft (41).

4. A centrally integrated high torque drive unit according to claim 3, characterized in that: The bridge housing (1) and the second housing (43) are integrally formed.

5. The centrally integrated high torque drive unit according to claim 1, characterized in that: A closing disk (511) is provided at one end of the half shaft (51) away from the multi-stage reducer (3); The half shaft (51) is connected to the wheel hub brake disc assembly (5) via the closing disc (511) and blocks the opening.

6. A centrally integrated high torque drive unit according to claim 1, characterized in that: The driving motor (2) is fixed to the multi-stage reducer (3) via a fastener; Wherein, the driving motor (2) is configured as a high-torque disc motor.

7. The centrally integrated high torque drive unit according to claim 1, characterized in that: The wheel hub brake disc assembly (5) comprises a wheel hub body and a brake disc body; Wherein, the wheel hub body and the brake disc body are integrally formed castings.

8. The centrally integrated high torque drive unit according to claim 1, characterized in that: Also included is a brake caliper assembly (6); The brake caliper assembly (6) is fixedly mounted on the outer wall of the bridge housing (1) and is located between the wheel hub brake disc assembly (5) and the planetary reducer (4).

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