CN102555771A - Speed-reducing wheel edge driving system with motor mass as dynamic vibration absorber mass - Google Patents

Abstract

The invention discloses a deceleration wheel drive system in which the motor is used as the mass of the dynamic vibration absorber. The motor is suspended on the reducer housing through the spring damping of the dynamic vibration absorber, so that the mass of the motor is converted into the mass of the dynamic vibration absorber, and the power is output by the motor. , through the first-stage reduction gear pair, the intermediate shaft, the second-stage reduction gear pair, the half shaft and the hub, and finally transmitted to the rim to drive the vehicle. The advantage of the present invention is that the motor is transformed into the mass of the dynamic shock absorber, so that the dynamic shock absorber is no longer limited by the space of the wheel and the mass of the vehicle, and the performance of the dynamic shock absorber is improved; the unsprung mass of the wheel drive system is reduced, thereby improving The vertical performance of the vehicle; the gear reduction mechanism is adopted, and the efficiency is high.

Description

Reduction wheel drive system with electric motor as mass of dynamic shock absorber

technical field

The invention relates to the field of electric vehicle chassis and transmission, in particular to a deceleration wheel-side drive system in which the motor is used as the mass of a dynamic vibration absorber.

Background technique

Wheel drive means that the motor is arranged in the wheel or near the wheel, and the power is directly transmitted from the motor to the wheel or through the reduction gear to drive the vehicle. Because the wheel drive system omits the clutches, universal joints, transmission shafts and differentials of traditional cars, it has unique advantages compared with centralized drives, such as: the structure of the whole vehicle is simple, and the space available for the whole vehicle is increased. Large; short transmission chain, improved transmission efficiency of the drive system; dynamic control is more flexible and convenient.

However, since the wheel drive system integrates components such as motors, deceleration mechanisms and brakes in or near the wheels, the unsprung mass is greatly increased, and the grounding performance of the tires of the car and the ride comfort of the car are deteriorated. The dynamic shock absorber can effectively improve the problem caused by the large unsprung mass of the wheel drive system by installing a set of spring damping mass system in the wheel. However, limited by the wheel space, only a small dynamic shock absorber can be used, so that its shock absorption effect is limited. If a larger dynamic shock absorber is used, it will not only take up a lot of space and make the layout inconvenient, but also increase the quality of the vehicle.

Bridgestone's patent US7614467B2 In-wheel motor system having damping mechanism, by suspending the motor on the wheel to act as a dynamic shock absorber, the motor transmits power through a flexible coupling, and its central axis is parallel to the central axis of the wheel. However, using a flexible coupling is inefficient and may cause fluctuations in the rotational speed torque output to the wheels.

Contents of the invention

The technical problem to be solved by the present invention is to provide a reduction wheel drive system that converts the motor into the mass of the dynamic vibration absorber, so that the dynamic vibration absorber is no longer limited to the motor in the space of the wheel as the mass of the dynamic vibration absorber.

In order to solve the above technical problems, the present invention provides a reduction wheel drive system in which the motor is used as the quality of the dynamic vibration absorber, which includes a right reducer housing, a first-stage reduction gear pair, a guide mechanism, a left reducer housing, Brake swivels, half shaft bushings, half shafts, second stage reduction gear pair and dynamic shock absorber spring damping. The motor is suspended on the reducer housing through the spring damping of the dynamic vibration absorber, so that the mass of the motor is transformed into the mass of the dynamic vibration absorber. The shaft and the hub are finally transmitted to the rim, which drives the vehicle.

The motor is mounted on the right reducer casing through bolts, the right reducer casing is supported on the left reducer casing through the casing bearing, and the inner and outer rings of the casing bearing are respectively supported on the left reducer casing and the right reducer casing Above, the housing bearing axis coincides with the intermediate shaft bearing axis, and the motor together with the right reducer housing can rotate around the housing bearing axis relative to the left reducer housing.

The right reducer housing and the left reducer housing have a guiding mechanism, which cooperates with the housing bearings to play a guiding role, and bears the inertial force and moment of the motor and the right reducer housing. The guide rail part of the guide mechanism is installed on the left reducer housing, the length direction of the guide rail is an arc, and the center of the bearing circle of the housing is the center, and the slider part is installed on the right reducer housing.

The housings of the left and right speed reducers are connected with each other by spring damping of a dynamic vibration absorber.

The casing seal is used for sealing between the right reducer casing and the left reducer casing to prevent the lubricating oil in the reducer casing from leaking.

The half-shaft casing is installed on the left reducer housing through bolts, the outer ring of the wheel hub bearing is supported on the half-shaft casing, the inner ring is supported on the wheel hub, the rim and brake rotating parts are installed on the wheel hub, and the brake fixing parts are fixed by bolts on the half shaft sleeve. Finally, the entire drive system is connected to the vehicle frame through a suspension mounted on the left reducer housing.

The countershaft is supported in the reducer housing by two countershaft bearings. The right end of the half shaft is supported on the housing of the left reducer through the half shaft bearing, and the left end is connected with the wheel hub through a spline. The power is output by the motor, through the first-stage reduction gear pair, the intermediate shaft, the second-stage reduction gear pair, the half shaft and the hub, and finally transmitted to the rim to drive the vehicle.

Brakes can use disc brakes or drum brakes, and the braking reaction torque is finally transmitted to the frame through the half shaft sleeve, the left reducer housing and the suspension.

In the present invention, the reaction force from the ground is transmitted to the half-shaft casing through the hub and the wheel hub bearing, and is transmitted to the left reducer casing by the half-shaft casing, and finally transmitted to the left reducer casing through the suspension connected to the left reducer casing. on the frame. Therefore, the half shaft does not bear the reaction force from the ground, which is similar to the full floating half shaft support structure of a traditional car.

Main effect of the present invention is:

(1) The motor is converted into the mass of the dynamic shock absorber, so that the dynamic shock absorber is not limited by the wheel space and the mass of the vehicle, which improves the performance of the dynamic shock absorber, thereby improving the vertical performance of the vehicle;

(2) Since the motor is converted into the mass of the dynamic shock absorber, the unsprung mass of the wheel drive system is reduced, thereby improving the vertical performance of the vehicle;

(3) The gear reduction mechanism is adopted, and the efficiency is high.

Description of drawings

Figure 1 is a 1/4 vehicle two-degree-of-freedom vibration model of a common wheel-side drive electric vehicle;

Fig. 2 is the three-degree-of-freedom vibration model of the wheel-driven electric vehicle 1/4 vehicle of the motor of the present invention as the quality of the dynamic vibration absorber;

Fig. 3 is the structural diagram of the motor of the present invention as the reduction type wheel drive system of the quality of the dynamic vibration absorber;

Fig. 4 is a side view of the reducer housing and the motor of the present invention;

Explanation of symbols in the figure

1-right reducer housing; 2-housing bearing;

3-intermediate shaft bearing; 4-housing seal;

5-motor; 6-first-stage reduction gear pair;

7-guiding mechanism; 8-left reducer housing;

9-brake fixed part; 10-brake rotating part;

11-Half shaft sleeve; 12-Wheel hub bearing;

13 - half shaft; 14 - half shaft bearing;

15-wheel hub; 16-second stage reduction gear pair;

17 - intermediate shaft; 18 - intermediate shaft bearing;

19 - wheel rim; 20 - spring damping of dynamic shock absorber.

Detailed ways

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

Figure 1 is a 1/4 vehicle two-degree-of-freedom vibration model of an ordinary wheel-drive electric vehicle, where m1 is the unsprung mass other than the motor, m3 is the motor mass, and m2 is 1/4 sprung mass, since the motor is also an unsprung mass part, so the unsprung mass is larger.

In order to convert the motor into the mass of the dynamic shock absorber and reduce the unsprung mass of the wheel drive system, a 1/4 vehicle three-degree-of-freedom vibration model with the motor as the mass of the dynamic shock absorber is proposed, as shown in Figure 2. Among them, m2 is 1/4 of the sprung mass, m1 is the unsprung mass, mainly including the mass of wheels, rims, brake systems, half shafts, reduction mechanisms, reducer housings, etc., and m3 is the mass of the motor, which is damped by the spring of the dynamic vibration absorber mounted on wheels. The motor makes the motor swing around a certain point of the unsprung mass through the guide mechanism. The vertical performance of the vehicle can be greatly improved by properly setting the damping coefficient c3 and the stiffness coefficient k3.

Based on the vibration model shown in Figure 2, the structure of the deceleration wheel-side drive system in which the motor is used as the quality of the dynamic vibration absorber is proposed, and Figure 3 is a schematic structural diagram of the present invention. The present invention mainly includes a right reducer housing 1, a housing bearing 2, an intermediate shaft bearing 3, a housing seal 4, a motor 5, a first-stage reduction gear pair 6, a guide mechanism 7, a left reducer housing 8, and a brake Fixed part 9, brake rotating part 10, half shaft sleeve 11, wheel hub bearing 12, half shaft 13, half shaft bearing 14, wheel hub 15, second stage reduction gear pair 16, intermediate shaft bearing 17, intermediate shaft 18, rim 19 , Dynamic shock absorber spring damping 20. The motor 5 is suspended on the reducer housing through the spring damper 20 of the dynamic vibration absorber, so that the mass of the motor 5 is transformed into the mass of the dynamic vibration absorber. The reduction gear pair 16, the half shaft 13 and the hub 15 are finally transmitted to the rim 19 to drive the vehicle.

The motor 5 is mounted on the right reducer housing 1 through bolts, the right reducer housing 1 is supported on the left reducer housing 8 through the housing bearing 2, and the inner and outer rings of the housing bearing 2 are respectively supported on the left reducer housing 8 and the right reducer housing 1, the axis of the housing bearing 2 coincides with the axis of the intermediate shaft bearing 18, and the motor 5 together with the right reducer housing 1 can rotate around the axis of the housing bearing 2 relative to the left reducer housing 8.

The right reducer housing 1 and the left reducer housing 8 have a guide mechanism 7, which cooperates with the housing bearing 2 to play a guiding role, and bears the inertial force and moment of the motor 5 and the right reducer housing 1 . The guide rail part of described guiding mechanism 7 is installed on the left speed reducer housing 8, and the guide rail length direction is an arc, and is the center of circle with housing bearing 2 circle centers, and slide block part is installed on the right speed reducer housing 1.

The left reducer housing 8 and the right reducer housing 1 are connected by a spring damper 20 of a dynamic vibration absorber. As shown in Figure 4, but not limited to the position shown in the figure, it only needs to be installed between the fixed part and the swing part in the wheel. Thus, the mass of the motor 5 together with a part of the right reducer housing 1 is transformed into the mass of the dynamic vibration absorber.

The housing seal 4 is used for the sealing between the right reducer housing 1 and the left reducer housing 8 to prevent the lubricating oil in the reducer housing from leaking.

The half shaft sleeve 11 is installed on the left reducer housing 8 through bolts, the outer ring of the hub bearing 12 is supported on the half shaft sleeve 11, the inner ring is supported on the hub 15, the rim 19 and the brake rotating part 9 are installed on the hub 15, The brake fixing part 10 is then fixed on the half-shaft sleeve 11 by bolts. Finally, the whole drive system is connected to the vehicle frame by suspension mounted on the left reducer housing 8 .

The intermediate shaft 18 is supported in the right reducer housing 1 and the left reducer housing 8 through two intermediate shaft bearings 3 , 17 . The right end of the half shaft 13 is supported on the left reducer housing 8 through the half shaft bearing 14, and the left end is connected with the wheel hub 15 through a spline. The power is output by the motor 5, passed through the first-stage reduction gear pair 6, the intermediate shaft 18, the second-stage reduction gear pair 16, the half shaft 13 and the hub 15, and finally transmitted to the rim 19 to drive the vehicle.

The brake can use a disc brake or a drum brake, and the braking reaction torque is finally transmitted to the vehicle frame through the half shaft sleeve 11, the left reducer housing 8 and the suspension.

In the present invention, the reaction force from the ground is transmitted to the half shaft sleeve 11 through the hub 15 and the hub bearing 12, and is transmitted to the left reducer casing 8 by the half shaft sleeve 11, and finally connected to the left reducer casing The suspension of the 8 is transferred to the frame. Therefore, in this system, the half-shaft 13 does not bear the reaction force from the ground, which is similar to the full-floating half-shaft support structure of a traditional car.

Claims (4)

1. a motor is taken turns the limit drive system as the slowdown type of dynamic vibration absorber quality; Comprise right reducer shell, first order speed reducing gear pair, guiding mechanism, left reducer shell, drg revolving part, axle tube, semiaxis, second stage speed reducing gear pair and dynamic vibration absorber spring damping; It is characterized in that: motor is suspended on the reducer shell through the dynamic vibration absorber spring damping; Make motor quality be converted into the dynamic vibration absorber quality, power is exported by motor, through first order speed reducing gear pair, tween drive shaft, second stage speed reducing gear pair, semiaxis and wheel hub; Finally be passed to wheel rim, powered vehicle.

2. motor according to claim 1 is as the slowdown type wheel limit drive system of dynamic vibration absorber quality; It is characterized in that: said motor is installed on right reducer shell through bolt; Right reducer shell is supported on the left reducer shell through the housing bearing, and motor can rotate around the housing BEARING SHAFT with respect to left reducer shell together with right reducer shell.

3. motor according to claim 1 is as the slowdown type wheel limit drive system of dynamic vibration absorber quality; It is characterized in that: said right reducer shell and left reducer shell have a guiding mechanism; Directional tagging is played in combined action with the housing bearing, and bears the effect of motor and right reducer shell force of inertia and moment.

4. motor according to claim 1 is as the slowdown type wheel limit drive system of dynamic vibration absorber quality, and it is characterized in that: dynamic bump leveller spring damping links to each other between left and right reducer shell.

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