JPH03217334A - Stopping device for automobile - Google Patents

Abstract

PURPOSE: To facilitate adjustment of stopping characteristics by braking a sun gear of a planetary gear device by a braking device formed as a pump, in a four-wheel driving vehicle having a planetary gear device for a driving shaft and a braking device responding to the difference of revolutions between front and rear axles. CONSTITUTION: Front wheels 7 are driven by a front axle differential gear 5 into which power from a motor 2 is to be input through a transmission 3, and a bridge 10 of a planetary gear device 9 is driven through a driving shaft 24 by power branched from the front axle differential gear 5 through a right angle gear drive 8. Planetary gears 11 are shaft supported on the bridge 10, the planetary gears 11 are engaged with a hollow ring 12 connected to a longitudinal shaft 14 extending to a rear axle at the outer periphery and engaged with a sun gear 13 connected to a braking device 19 functioning as a pump at the inner periphery. The gear ratio of a front axle 4, the rear axle and the planetary gear device 9 is set to such a value that the sun gear 13 may be stopped when the front wheels 7 and the rear wheels are rotated with the same revolution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a permanent all-wheel drive system with a three-part planetary gearing for the drive axle and a braking system responsive to the speed difference between the rear and front axles. The present invention relates to a stopping device for an automobile having a drive lobe, a front axle, and a rear axle.

Such a device is known, for example, from European Patent No. 216749A1.
It is known from No. In this case, there is the disadvantage that the adjustment possibilities mentioned in the viscose bond described as a brake device, such as changing the gap or changing the content, are based on mechanically movable sliding parts.

This causes the reaction times to be correspondingly long and does not meet modern requirements.

The invention is based on the problem of providing a braking device which is simple in construction and whose stopping characteristics are easily adjusted with minimal reaction times.

According to the present invention, the bridge supporting the planet gear is connected non-rotatably to the drive of the front shaft, and the hollow ring meshing with the planet gear is non-rotatably connected to the drive of the rear shaft, and the sun gear is connected to the pump. and a gear ratio between the drive and the driven of the planetary gearing on the one hand and the said rear shaft on the other hand, This is solved by arranging the sun gear so that it stops at the same rotational speed of the wheels of the axle and the wheels of the rear axle.

This design has the advantage that, in fact, also when the wheels of the front axle and the wheels of the rear axle are provided with different rotational speed ratios, only a power loss is provided in that case. Only in this case is a braking moment generated.

In a further development of the invention, it is provided that a pump supplies pressurized liquid to the throttle valve. The lost power of such pumps is carried away by the cooler. A simple adjustment of the pump is also achieved by means of a throttle valve arrangement. A throttle valve is placed in the backflow of the pump to the storage container. Rotational guidance, which is susceptible to interference, is therefore unnecessary.

It is advantageously provided that the passage of the throttle valve is adjustable. In this way the rotational moment distribution can be adjusted. Furthermore, in this case, for example, when a certain speed is exceeded, the flow path of the throttle valve is interrupted in such a way as to prevent the lateral stability of the vehicle equipped with a shut-off block for the driving brake from being adversely affected. The entire flow path can be switched to

It is also conceivable to couple the throttle valve with the control of the operational brake in such a way that the throttle valve is switched over the entire flow path as soon as the operational brake is activated.

This is also achieved in that a switching valve is provided in parallel to the throttle valve, which switching valve opens a further backflow path to the storage container upon actuation of the running brake.

Furthermore, the invention provides that the diameter of the sun gear is substantially smaller than the planet gear. A speed transmission is thereby achieved, so that the braking device or pump only needs to generate a small braking moment.

It is also achieved by inserting a transmission stage between the sun gear and the braking device, which produces a speed transmission.

The present invention will be described below with reference to drive diagrams and drawings showing the configuration and circuit operation of the planetary gear system.

The motor vehicle 1 shown in FIG. 1 is designed as an all-wheel drive motor vehicle. The tun I includes a motor 2 and a transmission 3 driven by the motor 2. A front wheel 7 attached to the front wheel 4 is driven via a front axle differential 5 and a front transverse shaft 6, which are non-rotatably (strongly resistant to torsion) connected to the transmission 3. Drive for the rear axle 15 is branched from the front wheel differential 5 via a right angle gear drive 8. The right-angle gear drive 8 drives the bridge IO of the planetary gear train 9 via the drive shaft 24 . A planetary gear 11 is attached to the bridge 10. These mesh with the hollow ring I2 at the outer periphery. Further, the planetary gear I+ meshes with the sun gear 13, and the sun gear 1
A braking device 19 is non-rotatably connected to 3. hollow ring 1
2 is non-rotatably connected to the longitudinal axis l4. This drives the rear wheel differential 16 on the rear axle 15. Starting from the rear axle differential I6, the rear wheels I8 are driven via the rear transverse shaft 17. The gear ratio between the front axle 4 and the rear axle 15 as well as the planetary gearing 9 is adjusted such that the sun gear 13 stops when the front wheels 7 and the rear wheels 18 rotate at the same rotational speed.

As can be seen in particular from FIG. 2, the sun gear 13 is non-rotatably connected to a pump 19 of the brake system.

The sun gear I3 drives the pump 19, for example, when a difference in rotational speed remains between the front wheels 7 and the rear wheels 8 of the vehicle I. The pump 19 draws liquid from the storage container 22 via a conduit 23 and supplies it back to the storage container 21 via a counterflow conduit 22 to the throttle valve 20.

Preferably, the throttle valve is configured to be adjustable, so that its flow cross section and thus the force output and, depending on it, the braking moment generated by the braking device can be varied. Depending on the magnitude of the braking moment, the rotational moment between the front axle 4 and the rear axle l5 as well as the rear wheel l
Transfer of the drive moment to 8 takes place.

[Brief explanation of drawings]

FIG. 1 is a driving diagram showing an automobile equipped with all-wheel drive, and FIG. 2 is a schematic diagram showing a planetary gear system equipped with a braking device. In the figure, symbol I is a car (vehicle), 4 is a front axle, and 7 is a wheel (
9 is a planetary gear system, 10 is a bridge, II is a planetary gear, I2 is a hollow ring, f3 is a sun gear, 15 is a rear shaft,
18 is a wheel (rear wheel), 19 is a pump, and 20 is a throttle valve.

Claims (5)

[Claims] (1) Drive rope of a car with permanent all-wheel drive, front In the axle-rear axle motor vehicle stopping device, the bridge (10) supporting the planetary gear (11) is non-rotatable with respect to the drive of the front axle (4) and the bridge (10) supporting the planetary gear (11)
1), a hollow wheel (12) meshing with the rear shaft (15) is non-rotatably connected to the drive of the rear shaft (15), and the sun gear (13) can be braked via a brake device (19) formed as a pump; and between the driving and driven parts of the planetary gear system (9) on the one hand, and the front shaft (4) and the rear shaft (15) on the other hand.
The gear ratio between the sun gear (13) is adjusted such that the sun gear (13) stops when the wheels (7) of the front axle (4) and the wheels (17) of the rear axle (15) rotate at the same speed. A vehicle stopping device characterized by: (2) The stopping device for a motor vehicle according to claim 1, wherein the pump (19) supplies pressurized liquid to the throttle valve (20). (3) The vehicle stop device according to claim 2, characterized in that the passage of the throttle valve (20) is adjustable. (4) The diameter of the sun gear (13) is the same as the diameter of the planet gear (1
1) A motor vehicle stopping device according to claim 1, characterized in that it is substantially smaller than 1). (5) The stopping device for a motor vehicle according to claim 1, characterized in that a transmission stage for speed transmission is arranged between the sun gear (13) and the braking device (19).