CN102009576A - Single trailing arm suspension deceleration type wheel electric drive system - Google Patents

Abstract

The invention discloses a single trailing arm suspension deceleration wheel side electric drive system. The A-shaped single trailing arm suspension swing arm is supported on both ends of the motor shaft through a sliding bearing and a sliding bearing cover. The single trailing arm suspension swing arm It is connected to one end of the axle, and the other end of the axle is connected to the hub through the hub bearing. The hub, rim and brake drum are fixed together by bolts; the small gear is installed on the output shaft of the motor through a flat key, and the large gear is fixed by several bolts. It is mounted on the brake drum and meshes with the pinion. The invention has the advantages of compactness and simplicity, high transmission efficiency, and independent controllable driving force of each wheel, which is beneficial to improving the stability and comfort of the vehicle.

Description

Single trailing arm suspension deceleration wheel side electric drive system

technical field

The invention relates to a drive system of an electric vehicle, in particular to a single trailing arm suspension deceleration wheel side electric drive system.

Background technique

Electric vehicles can be divided into centralized motor drive form and electric wheel drive form according to different modes of motor drive wheels. The power transmission in the form of centralized motor drive is generally transmitted to the drive wheels through mechanical devices such as reducers, differentials, drive shafts, and universal joints. This type of drive has a complex structure, low transmission efficiency, and cannot achieve independent control of the wheels.

In the electric wheel drive mode, the motor is directly installed on the driving wheel. The driving system and the vehicle have a simple structure and high transmission efficiency. The driving torque of each electric wheel can also be controlled independently, which is conducive to improving the driving performance under harsh road conditions. The motors used in electric wheel drives are mainly divided into high-speed inner rotor motors and low-speed outer rotor motors. High-speed inner-rotor motors are small in size, light in weight, low in cost and high in power density, but generally must be decelerated by planetary gear reducers installed inside the wheels to transmit power to the wheels; outer-rotor motors can provide higher torque to directly drive the wheels , the mechanism is simple, but its own volume, mass, and low power density. Therefore, whether it is a high-speed inner rotor or a low-speed outer rotor motor-driven electric wheel, their unsprung mass is relatively large, and the size and quality of the motor are greatly limited.

Compared with the centralized motor drive, the electric wheel transmission has great advantages, but the disadvantages are also obvious.

Contents of the invention

The technical problem to be solved by the present invention is to provide a single trailing arm suspension deceleration wheel side electric drive system with reduced unsprung mass, compact and simple structure and high transmission efficiency. In the present invention, the single trailing arm suspension is used to swing in the lateral plane of the vehicle, and the rolling center axis of the wheel is arranged at both ends of the single trailing arm suspension in parallel with the output axis of the motor, so that during the swinging process of the suspension, the rolling center of the wheel The axis is parallel to the output axis of the motor and the distance is constant. The power transmission between the motor and the wheels can be a pair of gears, a pair of pulleys or a pair of sprocket transmissions. In addition, by setting the gear ratio, it can also play the role of deceleration and torque increase. The present invention can be used for the deceleration wheel side drive of non-steering wheels, and when the two rear wheels are driven, one set of the system is used on the left and right sides.

In order to solve the above technical problems, the present invention provides a single trailing arm suspension deceleration wheel side electric drive system, the A-shaped single trailing arm suspension swing arm is supported on both ends of the motor shaft through sliding bearings and sliding bearing covers, The swing arm of the single trailing arm suspension is connected to one end of the axle, and the other end of the axle is connected to the hub through the hub bearing. The hub, rim and brake drum are fixed together by bolts; the pinion is installed on the output shaft of the motor through a flat key. The large gear is installed on the brake drum by several bolts, and meshes with the pinion, so that the center axis of wheel rolling is parallel to the axis of the output shaft of the motor and the distance is constant.

The motor casing of the sliding bearing is respectively provided with a shoulder, and the two ends of the sliding bearing are also provided with a shoulder, which limits the axial movement of the swing arm of the single trailing arm suspension, that is, limits the lateral movement of the wheel. Xiangli.

The swing arm of the single trailing arm suspension of the present invention is connected to one end of the axle, and is installed on the casing of the motor through the sliding bearings at both ends of the motor, that is, the axis of the output shaft of the motor coincides with the swing center axis of the single trailing arm suspension, and the rim passes through The hub bearing is supported on the axle, that is, the center axis of wheel rolling coincides with the axis of the axle. Therefore, when the wheel is beating, the axis of the motor output shaft and the rolling center axis of the wheel are always parallel and the distance remains unchanged.

The swing arm of the single trailing arm suspension is supported on the front and rear ends of the motor housing through the sliding bearings at both ends of the motor. Because the motor has a certain size in the axial direction, the swing arm part of the single trailing arm suspension, that is, the A type The arm part has a certain span. When there is a certain gap between the sliding bearing and the shaft, the larger span causes the axle-single trailing arm suspension swing arm to rotate less in the horizontal plane of the car, and the structure of the A-arm Increase the stiffness of the suspension against lateral forces. The above two factors will reduce the interference on the transmission system due to the slight rotation of the suspension in the horizontal plane and the lateral deformation. At the same time, this structure is compact and avoids structural interference with the motor shaft.

The brake system of the present invention can use disc brakes or drum brakes.

The superior efficacy of the present invention lies in that a high-speed inner-rotor motor with high specific power can be used by adopting a reduction-type wheel-side electric drive system. The motor and some deceleration transmission parts belong to the sprung mass, which greatly reduces the unsprung mass compared with the electric wheel, and at the same time retains many of its advantages. This system has a compact and simple structure, high transmission efficiency, and the driving force of each wheel is independently controllable, which is conducive to improving the stability and comfort of the vehicle.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the principle schematic diagram that the present invention adopts gear transmission;

Fig. 3 is the schematic diagram of the principle that the present invention adopts belt/chain transmission;

Explanation of symbols in the figure

1—brake drum; 2—wheel rim;

3—wheel bearing; 4—wheel hub;

5—pinion; 6—sliding bearing cover C;

7—sliding bearing A; 8—motor;

9—sliding bearing cover D; 10—sliding bearing B;

11—single trailing arm suspension arm; 12—big gear;

13—small pulley/small sprocket; 14—large pulley/large sprocket;

15—drive belt/drive chain; 16—axle.

Detailed ways

Please refer to the accompanying drawings for a further description of the present invention.

As shown in Fig. 1 , the present invention uses a gear transmission mode and is equipped with a drum brake as an example. Other transmission modes and systems equipped with disc brakes only need to be slightly modified on this basis, and will not be elaborated here.

As shown in FIG. 1 , the pinion 5 is installed on the output shaft of the motor through a flat key, and the large gear 12 obtains power by meshing with the pinion 5 . Bull gear 12 is installed on the brake drum 1 by several bolts, and brake drum 1, wheel hub 4 and rim 2 are fixed together by bolts, and bull gear 12 just can drive wheel like this. The inner ring of the hub 4 is supported by the outer ring of the hub bearing 3 , and the inner ring of the hub bearing 3 is supported by the axle 16 and the axle portion of the single trailing arm suspension swing arm 11 . The wheel hub bearing 3 is positioned and installed by the back nut, the shoulder on the axle 16 and the single trailing arm suspension swing arm 11, the shoulder of the wheel hub 4 and the hole with a circlip.

Motor 8 is connected to vehicle frame by elastic rubber hinge. The shell at two ends of the motor 8 is made into a cylindrical shape and its centerline coincides with the axis of the output shaft of the motor 8 . The axle 16 and the swing arm part of the single trailing arm suspension swing arm 11 are connected with the bearing caps 6C, 9D by bolts to form an inner ring supported on the outer rings of the sliding bearings 7A, 10B, and the inner rings of the sliding bearings 7A, 10B are supported on the electric motor. At the front and rear cylindrical positions of the casing, because the motor has a certain size in the axial direction, the axle 16 and the swing arm part of the single trailing arm suspension swing arm 11 form an A-shape, and the bottom of the A-shape has a certain span. When there is a certain gap between the bearing and the shaft, the micro-rotation of the suspension in the horizontal plane is reduced, and at the same time, the stiffness of the suspension to withstand the lateral force is increased, and the rotation and deformation of the suspension in the horizontal plane are reduced. 5, large gear 12 The interference effect generated by the transmission, and the structure is compact at the same time, avoiding the structural interference with the motor shaft. The motor casings for mounting the sliding bearings 7A, 10B are respectively provided with a shoulder, and the two ends of the sliding bearings 7A, 10B are also provided with shoulders, thereby limiting the axle 16 and the single trailing arm suspension swing arm 11 along its axial direction. Movement, by limiting the lateral movement of the wheel in this way, withstands the lateral forces transmitted by the wheel.

In addition, in the axle 16 and the single trailing arm suspension swing arm 11, the axis of the axle is parallel to the center axis of rotation of the swing arm, which ensures that the center axis of wheel rolling and the axis of the motor output shaft are always parallel and the distance remains unchanged during the wheel jumping process. Like this, pinion 5 and bull gear 12 just can mesh all the time. As shown in FIG. 2, the motor 8 transmits power to the pinion 5, and the large gear 12 meshes with the pinion 5 to obtain power, and then drives the wheels.

In this embodiment, both the motor 8 and the pinion 5 are sprung masses.

In this embodiment, the spring can be a torsion bar spring or a coil spring.

As shown in Figure 3, transmission system of the present invention adopts belt/chain transmission mode, and the motor 8 that is fixed on the vehicle frame transmits power to small pulley/small sprocket 13, and this small pulley/small sprocket 13 passes transmission belt The transmission chain 15 drives the large pulley/large sprocket 14 to rotate, and then drives the wheels.

Claims (2)

1. a single longitudenal arm suspension slowdown type is taken turns the limit power drive system, it is characterized in that: A font single longitudenal arm suspension swing arm is bearing on the motor shaft two ends by plain bearing and plain bearing lid, the single longitudenal arm suspension swing arm is connected with an end of axletree, the other end of axletree connects with wheel hub by hub bearing, and wheel hub, wheel rim and brake wheel are fixed together by bolt; Miniature gears is installed on the motor output shaft by flat key, and big gear wheel is installed in it on brake wheel by several bolts, and and pinion, make wheel rolling central axis and motor output shaft parallel axes and distance constant.

2. single longitudenal arm suspension slowdown type wheel according to claim 1 limit power drive system, it is characterized in that: the motor housing place of plain bearing is provided with a convex shoulder respectively, the two ends of plain bearing also are provided with convex shoulder, limit the single longitudenal arm suspension swing arm and moved along its axis, promptly limited the side force that the shifted laterally of wheel is transmitted.

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