CN114043823A

CN114043823A - Integrated steering electric drive axle

Info

Publication number: CN114043823A
Application number: CN202111424253.8A
Authority: CN
Inventors: 王雪磊; 冷昌槐; 安向京; 白阳
Original assignee: Changsha Xingshen Intelligent Technology Co Ltd
Current assignee: Changsha Xingshen Intelligent Technology Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-02-15

Abstract

The invention discloses an integrated steering electric drive axle which comprises an axle, wherein wheel edge assemblies are arranged at two ends of the axle, a driving motor and a reduction gearbox are arranged between the wheel edge assemblies at the two ends, the output end of the driving motor is connected with the input end of the reduction gearbox, the output end of the reduction gearbox is provided with two output shafts, the two output shafts are respectively connected with the two wheel edge assemblies in a one-to-one correspondence mode through half shaft assemblies, a steering engine assembly support is arranged on the axle, a steering engine assembly is arranged on the steering engine assembly support, a steering knuckle is arranged on the wheel edge assembly, a steering arm is arranged on the steering knuckle, and the steering engine assembly is connected with the steering arm. The invention does not need to match with an auxiliary frame and corresponding mounting accessories, has more compact and reasonable structure, is beneficial to reducing the structural size and weight of the electric drive axle, reducing the cost, improving the vehicle bearing capacity and improving the performance of the electric drive axle.

Description

Integrated steering electric drive axle

Technical Field

The invention relates to a new energy automobile, in particular to an integrated steering electric drive axle.

Background

With the vigorous development of new energy automobiles in China, electric automobiles occupy an important position in the market due to the characteristics of high efficiency, low cost, less pollution and the like, and the electric automobile has rapid application and technical development on core parts of electric drive axles of the electric automobiles. Most of electric automobiles are driven by independent suspension front axles, and the products adopting the bearing type integral steering front axle are fewer; the reduction box is connected to the wheel end through the ball cage semi-axis and accomplishes power take off, and this kind of current power drive system, a steering system, braking system need match sub vehicle frame and corresponding installation annex, lead to the part assembly complicacy, and is with high costs, and bearing capacity is lower. In addition, in the vehicle brake of the existing unmanned vehicle, the brake is basically arranged at the end of the driving motor or at the end of the driving wheel, which is not beneficial to accurately controlling the braking torque, and the larger the braking torque of the brake is, the larger the corresponding volume and weight are, the layout on the vehicle is limited, the weight of the vehicle is increased, and the dynamic performance of the vehicle is affected.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an integrated steering electric drive axle which is compact in layout, beneficial to reducing the size and weight of the electric drive axle, reducing the cost and improving the carrying capacity of a vehicle.

In order to solve the technical problems, the invention adopts the following technical scheme:

the integrated steering electric drive axle comprises an axle, wheel edge assemblies are mounted at two ends of the axle, a driving motor and a reduction gearbox are arranged between the wheel edge assemblies at the two ends, the output end of the driving motor is connected with the input end of the reduction gearbox, the output end of the reduction gearbox is provided with two output shafts, the two output shafts are respectively connected with the two wheel edge assemblies in a one-to-one correspondence manner through half shaft assemblies, a steering engine assembly support is arranged on the axle, a steering engine assembly is arranged on the steering engine assembly support, a steering knuckle is arranged on the wheel edge assembly, a steering arm is arranged on the steering knuckle, and the steering engine assembly is connected with the steering arm.

As a further improvement of the above technical solution: the semi-axle assembly is provided with a gear ring, and the wheel edge assembly is provided with a sensor for collecting a gear ring rotating speed signal.

As a further improvement of the above technical solution: the gear ring with the semi-axis assembly can be dismantled and be connected, be equipped with detachable sensor support on the wheel limit assembly, the sensor install in on the sensor support.

As a further improvement of the above technical solution: and a parking brake device is arranged on one side of the driving motor opposite to one group of the wheel edge assemblies.

As a further improvement of the above technical solution: the parking braking device comprises a braking gear, a brake and a gear transmission assembly, wherein an output gear is arranged on the output shaft, the gear transmission assembly is arranged between a rotating shaft of the driving motor and the output gear, the braking gear is meshed with the output gear, and the brake is connected with a gear shaft of the braking gear.

As a further improvement of the above technical solution: the radius of the reference circle of the brake gear is smaller than that of the output gear.

As a further improvement of the above technical solution: the gear transmission assembly comprises a driving gear, a first transmission gear and a second transmission gear, the driving gear is installed on a rotating shaft of the driving motor and meshed with the first transmission gear, the second transmission gear is coaxially arranged with the first transmission gear and meshed with the output gear, the reference circle radius of the driving gear is smaller than that of the first transmission gear, and the reference circle radius of the second transmission gear is smaller than that of the output gear.

As a further improvement of the above technical solution: an emergency operation handle is arranged on the brake.

As a further improvement of the above technical solution: the gearbox is characterized in that a gearbox positioning area is arranged in the middle of the axle, mounting flanges are welded on two sides of the gearbox positioning area, the gearbox is connected with the mounting flanges through fasteners, two ends of the axle are of tubular structures, and the half shaft assembly penetrates through the axle.

As a further improvement of the above technical solution: the suspension mounting bracket is positioned between the wheel side assembly and the steering engine assembly bracket and comprises a shock absorber bracket and a connecting rod bracket, and the shock absorber bracket and the connecting rod bracket are of U-shaped structures and have opposite directions.

Compared with the prior art, the invention has the advantages that: according to the integrated steering electric drive axle disclosed by the invention, a driving motor sequentially passes through the reduction gearbox, the two output shafts at the output end of the reduction gearbox and the half shaft assemblies at the two sides of the reduction gearbox to simultaneously output the torque to the wheel side assemblies at the two ends of the axle, so that a vehicle is driven to run, and the transmission efficiency is high; the steering engine assembly is arranged on the steering engine assembly support, the wheel side assembly is provided with the steering knuckle, the steering knuckle is provided with the steering arm, and the steering engine assembly can drive the wheel side assembly to rotate through the steering arm and the steering knuckle in sequence, so that the vehicle steering function is realized, an auxiliary frame and corresponding installation accessories are not required to be matched, the structure is more compact and reasonable, the structural size and the weight of the electric drive axle are favorably reduced, the cost is reduced, the vehicle bearing capacity is improved, and the performance of the electric drive axle is improved.

Drawings

Fig. 1 is a schematic perspective view of an integrated steering electric drive axle according to the present invention.

Fig. 2 is a schematic top view of the integrated steer electric drive axle of the present invention.

Fig. 3 is a partially enlarged view of fig. 1.

Fig. 4 is a schematic view of the internal structure of the parking brake device in the present invention.

The reference numerals in the figures denote: 1. an axle; 11. a gearbox positioning area; 12. installing a flange; 13. a fastener; 2. a wheel edge assembly; 21. a wheel mounting shaft; 22. a brake disc; 23. a brake caliper; 3. a drive motor; 4. a reduction gearbox; 41. an output shaft; 42. an output gear; 5. a half shaft assembly; 6. a steering gear assembly bracket; 61. a knuckle; 62. a steering arm; 7. a parking brake device; 71. a brake gear; 72. a brake; 73. a gear drive assembly; 731. a drive gear; 732. a first drive gear; 733. a second transmission gear; 74. an emergency operating handle; 81. a ring gear; 82. a sensor; 83. a sensor holder; 9. a suspension mounting bracket; 91. a shock absorber support; 92. a connecting rod bracket.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples of the specification.

Fig. 1 to 4 show an embodiment of an integrated steering electric drive axle according to the present invention, which includes an axle 1, wheel side assemblies 2 (including a wheel mounting shaft 21, a brake disc 22, brake calipers 23, wheels, etc., where the wheels are not shown) are mounted at two ends of the axle 1, a driving motor 3 and a reduction gearbox 4 are disposed between the wheel side assemblies 2 at the two ends, an output end of the driving motor 3 is connected with an input end of the reduction gearbox 4, an output end of the reduction gearbox 4 is provided with two output shafts 41, the two output shafts 41 are respectively connected with the wheel side assemblies 2 at the two ends through half-shaft assemblies 5 in a one-to-one correspondence manner, a steering engine assembly support 6 is disposed on the axle 1, a steering engine assembly (not shown) is disposed on the steering engine assembly support 6, a steering knuckle 61 is disposed on the wheel side assembly 2, and a steering arm 62 is disposed on the steering knuckle 61. The driving motor 3 is preferably a permanent magnet synchronous motor, so that the efficiency and reliability are high, the size is small, and the weight is light; the half shaft assembly 5 and the reduction gearbox 4 and the half shaft assembly 5 and the wheel edge assembly 2 are preferably connected through splines to transmit torque. It should be noted that the half shaft assembly 5 and the steering gear assembly are the same as the conventional structure, and are not described again.

In the integrated steering electric drive axle, a driving motor 3 simultaneously outputs torque to wheel edge assemblies 2 at two ends of an axle 1 through a reduction gearbox 4, two output shafts 41 at the output end of the reduction gearbox 4 and half shaft assemblies 5 at two sides of the reduction gearbox 4 in sequence so as to drive a vehicle to run, and the transmission efficiency is high; the axle 1 is integrated with a steering engine assembly support 6, the steering engine assembly is arranged on the steering engine assembly support 6, and the steering engine assembly can drive the wheel side assembly 2 to rotate sequentially through the steering arm 62 and the steering knuckle 61, so that the vehicle steering function is realized, an auxiliary frame and corresponding installation accessories are not required to be matched, the structure is more compact and reasonable, the structural size and the weight of the electric drive axle are reduced, the cost is reduced, the vehicle bearing capacity is improved, and the performance of the electric drive axle is improved.

Further, in the present embodiment, the half shaft assembly 5 is provided with a gear ring 81, and the wheel side assembly 2 is provided with a sensor 82 for acquiring a rotational speed signal of the gear ring 81. Through the cooperation of ring gear 81 and sensor 82, can accomplish the signal acquisition of fast wheel, and then the speed of real-time supervision vehicle.

Further, in the present embodiment, the ring gear 81 is detachably connected to the axle shaft assembly 5, the wheel side assembly 2 is provided with a detachable sensor bracket 83 (for example, the detachable connection is achieved through fasteners such as bolts and screws), and the sensor 82 is mounted on the sensor bracket 83. The sensor bracket 83 can be detached and replaced independently so as to adapt to the installation size requirements of different sensors 82, and the universality and the compatibility are good; gear ring 81 can be dismantled and change to match different kind of sensors 82 and realize fast signal acquisition of wheel, satisfy the whole car requirement, the flexibility is good.

Further, in this embodiment, one side that driving motor 3 is relative with a set of wheel limit assembly 2 among them is equipped with parking brake device 7 (refer to fig. 2, parking brake device 7 locates driving motor 3 towards one side of left side wheel limit assembly 2, of course in other embodiments, also can be with driving motor 3 rotation 180 for parking brake device 7 locates driving motor 3 towards one side of right side wheel limit assembly 2), thereby satisfy whole car outage braking function, prevent that the vehicle from the phenomenon of rolling away, and rational utilization space, the overall arrangement is compact. The optimal parking brake device 7 adopts an electromagnetic band-type parking brake device, the parking brake function is started in time when the parking power is off, and the parking brake function is closed in time when the reduction gearbox 4 works normally.

Referring to fig. 4, in the present embodiment, the parking brake device 7 includes a brake gear 71, a brake 72, and a gear transmission assembly 73, the output gear 42 is disposed on the output shaft 41, the gear transmission assembly 73 is disposed between the rotating shaft of the driving motor 3 and the output gear 42, the brake gear 71 is engaged with the output gear 42, and the brake 72 is connected to a gear shaft of the brake gear 71. In the parking brake device 7, the braking torque generated by the brake 72 can be transmitted to the output gear 42 and the output shaft 41 through the brake gear 71, after the gear ratio of the brake gear 71 and the output gear 42 is determined, the braking torque on the output shaft 41 can be accurately controlled, meanwhile, for the same brake 72, by changing the gear ratio of the brake gear 71 and the output gear 42, the output shaft 41 can obtain braking torques with different sizes, the selectable matching types of the brake 72 are more, and when the brake 72 with smaller braking torque is selected, the space occupied by the brake 72 can be reduced; the center distance between the brake gear 71 and the output gear 42 can be adjusted by changing the gear ratio or modulus between the brake gear 71 and the output gear, so that the installation position of the brake 72 is changed without being limited by the positions of the driving motor 3 and the output shaft 41, and the brake 72 is taken as an independent device, so that the brake is convenient to detach and replace independently, the efficiency is improved, and the space layout design of the whole reduction gearbox 4 is convenient. In a preferred embodiment, the brake 72 is an electromagnetic brake, which facilitates braking and idle control via an external circuit. Of course, in other embodiments, the brake may be any one of a mechanical brake, a hydraulic brake, and a pneumatic brake.

Further, in the present embodiment, the pitch circle radius of the brake gear 71 is smaller than the pitch circle radius of the output gear 42. Because the radius of the reference circle of the brake gear 71 is smaller, a smaller brake torque output by the brake 72 can generate a larger brake torque on the output shaft 41, and the brake 72 with a smaller brake torque can be selected, so that the weight of the brake 72 and the occupied space are reduced.

Further, in the present embodiment, the gear transmission assembly 73 includes a driving gear 731, a first transmission gear 732 and a second transmission gear 733, the driving gear 731 is installed on the rotating shaft of the driving motor 3 and is meshed with the first transmission gear 732, the second transmission gear 733 is coaxially arranged with the first transmission gear 732 and is meshed with the output gear 42, the reference circle radius of the driving gear 731 is smaller than the reference circle radius of the first transmission gear 732, and the reference circle radius of the second transmission gear 733 is smaller than the reference circle radius of the output gear 42, which is beneficial for outputting the power of the driving motor 3 in a speed-reducing and torque-increasing manner.

Further, in the present embodiment, an emergency operation handle 74 is provided on the brake 72. When power failure or electrical fault occurs, manual parking or parking release can be realized through the emergency operation handle 74, so that the parking brake function is more complete.

Furthermore, in the embodiment, the middle of the axle 1 is provided with the reduction gearbox positioning area 11, the two sides of the reduction gearbox positioning area 11 are welded with the mounting flanges 12, and the reduction gearbox 4 is connected with the mounting flanges 12 through fasteners 13 (such as bolts, screws and the like), so that redundant mounting accessories can be reduced, the occupied space is small, the mounting structure is reliable, and the mounting and dismounting are convenient during maintenance; the two ends of the axle 1 are tubular structures, and the half shaft assembly 5 is arranged in the axle 1 in a penetrating manner, so that the half shaft assembly 5 can fully utilize the inner space of the axle 1, and the volume of the electric drive axle is not additionally increased.

In this embodiment, the steering engine assembly support 6 is welded to the axle 1, so that the mounting flange 12 of the reduction gearbox 4, the steering engine assembly support 6 and the axle 1 form an integrated structure, and the electric drive axle has high integration level and strong bearing capacity.

As a preferred embodiment, the steering engine assembly support 6 is positioned above the reduction gearbox 4, and the steering engine assembly can be separated from the reduction gearbox 4 by using the steering engine assembly support 6, so that the structure is compact and reasonable.

Further, in this embodiment, suspension mounting brackets 9 are further installed at two ends of the axle 1, and the suspension mounting brackets 9 are located between the wheel side assembly 2 and the steering gear assembly bracket 6, so that the integration level of the electric drive axle is further improved, redundant mounting accessories are reduced, the structure is more compact, and the occupied space is smaller.

As a preferred embodiment, the suspension mounting bracket 9 comprises a shock absorber bracket 91 and a connecting rod bracket 92, the electric drive axle is connected with the frame through a suspension connecting rod and a suspension shock absorber, and positioning parameters of the electric drive axle are fixed; shock absorber support 91 and connecting rod support 92 are U type structure and the orientation is opposite, and structural strength is high, and bearing capacity is strong, and the dismouting of the suspension connecting rod of being convenient for, suspension shock absorber is maintained.

The working principle of the integrated steering electric drive axle is as follows: when the vehicle normally runs, the power of the driving motor 3 is transmitted to the wheel-side assembly 2 through the driving gear 731, the first transmission gear 732, the second transmission gear 733, the output gear 42, the output shaft 41 and the half shaft assembly 5 in sequence, and the gear transmission component 73 in the reduction gearbox 4 realizes that the power of the driving motor 3 is output in a speed reduction and torque increase mode. At this time, the brake 72 is not operated, and the brake gear 71 can rotate under the action of the output gear 42; when braking is required, the rotation of the drive motor 3 is stopped, the brake 72 is operated to stop the rotation of the brake gear 71, and the output gear 42 and the output shaft 41 are also stopped by the brake gear 71. When steering is needed, the steering engine assembly can drive the wheel side assembly 2 to rotate through the steering arm 62 and the steering knuckle 61 in sequence.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims

1. The utility model provides an integrated form turns to electric drive axle, includes axle (1), wheel limit assembly (2) are installed at the both ends of axle (1), both ends be equipped with driving motor (3) and reducing gear box (4), its characterized in that between wheel limit assembly (2): the output end of the driving motor (3) is connected with the input end of the reduction gearbox (4), the output end of the reduction gearbox (4) is provided with two output shafts (41), the two output shafts (41) are respectively connected with the two wheel side assemblies (2) in a one-to-one correspondence mode through half shaft assemblies (5), a steering engine assembly support (6) is arranged on the axle (1), a steering engine assembly is arranged on the steering engine assembly support (6), a steering knuckle (61) is arranged on the wheel side assemblies (2), a steering arm (62) is arranged on the steering knuckle (61), and the steering engine assembly is connected with the steering arm (62).

2. The integrated steer electric drive axle of claim 1, wherein: the gear ring (81) is arranged on the half shaft assembly (5), and the sensor (82) used for collecting the rotating speed signal of the gear ring (81) is arranged on the wheel edge assembly (2).

3. The integrated steer electric drive axle of claim 2, wherein: the gear ring (81) and the half shaft assembly (5) are detachably connected, a detachable sensor support (83) is arranged on the wheel side assembly (2), and the sensor (82) is installed on the sensor support (83).

4. The integrated steer electric drive axle of claim 1, wherein: and a parking brake device (7) is arranged on one side of the driving motor (3) opposite to one group of the wheel edge assemblies (2).

5. The integrated steer electric drive axle of claim 4, wherein: the parking brake device (7) comprises a brake gear (71), a brake (72) and a gear transmission assembly (73), an output gear (42) is arranged on the output shaft (41), the gear transmission assembly (73) is arranged between a rotating shaft of the driving motor (3) and the output gear (42), the brake gear (71) is meshed with the output gear (42), and the brake (72) is connected with a gear shaft of the brake gear (71).

6. The integrated steer electric drive axle of claim 5, wherein: the radius of the pitch circle of the brake gear (71) is smaller than the radius of the pitch circle of the output gear (42).

7. The integrated steer electric drive axle of claim 6, wherein: the gear transmission assembly (73) comprises a driving gear (731), a first transmission gear (732) and a second transmission gear (733), the driving gear (731) is installed on a rotating shaft of the driving motor (3) and meshed with the first transmission gear (732), the second transmission gear (733) is coaxially arranged with the first transmission gear (732) and meshed with the output gear (42), the reference circle radius of the driving gear (731) is smaller than that of the first transmission gear (732), and the reference circle radius of the second transmission gear (733) is smaller than that of the output gear (42).

8. The integrated steer electric drive axle of claim 5, wherein: an emergency operation handle (74) is arranged on the brake (72).

9. The integrated steer electric drive axle according to any one of claims 1 to 8, wherein: the automobile axle is characterized in that a reduction gearbox positioning area (11) is arranged in the middle of the automobile axle (1), mounting flanges (12) are welded on two sides of the reduction gearbox positioning area (11), the reduction gearbox (4) is connected with the mounting flanges (12) through fasteners (13), two ends of the automobile axle (1) are of tubular structures, and a half shaft assembly (5) penetrates through the automobile axle (1).

10. The integrated steer electric drive axle according to any one of claims 1 to 8, wherein: the suspension mounting bracket (9) is further mounted at two ends of the axle (1), the suspension mounting bracket (9) is located between the wheel side assembly (2) and the steering engine assembly bracket (6), the suspension mounting bracket (9) comprises a shock absorber bracket (91) and a connecting rod bracket (92), and the shock absorber bracket (91) and the connecting rod bracket (92) are both of U-shaped structures and opposite in orientation.