Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Patent
1992-05-21
1994-03-08
Ro, Bentsu
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
318362, 318468, 307 91, B60T 1374, F16D 6534
Patent
active
052935175
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a control device for a parking brake for a motor vehicle.
The invention concerns more particularly, but not exclusively, such a control device for a golf buggy, in particular of the kind aimed at by the Patent Application FR 88 07243 (FR-A-2 631 902) filed on the 31st May, 1988 in the Applicant's name.
The object of the invention is primarily to improve the efficiency of the parking brake.
SUMMARY OF THE INVENTION
According to the invention, the control device for the parking brake is characterized in that it includes motor means capable of actuating the parking brake and control means for the starting, in particular, the automatic starting of the motor means.
Preferably, the control device includes a rotary crank capable of driving a mechanical linkage acting on the parking brake, the motor means being capable of ensuring the rotation of the crank from an "engagement" position to a "disengagement" position and vice versa.
Preferably, the engagement and disengagement positions of the crank are diametrically opposed.
The motor means capable of actuating the parking brake and in particular the crank are advantageously constituted by an electric motor, optionally combined with a reducing gear that is, in particular, capable of driving the crank.
A device including a disk provided with two concentric tracks whereof at least one is open, and comprises an insulating space separating its two ends, is fixed on a drive shaft of the crank and is capable of cooperating with brushes coming into contact with these tracks to ensure the electric power supply for the motor so as to produce the stopping of the shaft and of the crank in a given position and to permit the movement of this crank only to pass from the engaged position to the disengaged position, or vice versa.
According to an advantageous mode of embodiment, in particular for a golf buggy, the motor means of the parking brake are capable of acting on a normal braking device, the mechanical linkage between the motor means of the parking brake and the normal braking device being ensured by a loss of motion device making it possible to retain a conventional actuation of the normal braking device by acting on the brake pedal.
The engaging or disengaging actuation can be manual, in particular, by means of push buttons and/or contacts that are capable of starting the motor means for actuating the parking brake in the engagement or disengagement direction.
As a variant, the actuation of engaging the parking brake can be manual, whilst provision is made for an automatic disengagement actuation during action on the accelerator pedal.
Advantageously, provision is made for an automatic actuation of the engagement of the parking brake in response to the absence of any action on the accelerator pedal; provision may be made for an adjustable time lag, in particular of the order of at least one second, for actuating the engagement of the parking brake after the action on the accelerator pedal has ceased.
In the case of a vehicle, in particular a golf buggy which comprises electric drive motors powered by a chopped current, the control device may includes means for controlling a control relay sensing the conductive or blocked state of a transistor energizing the electric drive motors.
Provision may be made for means sensing the speed of motion of the vehicle capable of only permitting the automatic engagement of the parking brake when the vehicle is stationary, or when its speed is less than a predetermined value.
Apart from the arrangements set out above, the invention consists of a certain number of other arrangements which will be discussed in greater detail below in conjunction with particular modes of embodiment described with reference to the attached drawings, but which are in no way restrictive.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 of these drawings is an electric circuit diagram of a parking brake control device according to the invention, with manual engagement and automatic disengagement.
FIG. 2 is a circuit
REFERENCES:
patent: 3875820 (1975-04-01), Morden
patent: 4941553 (1990-07-01), Harrison
patent: 4991699 (1991-02-01), Hiraiwa et al.
patent: 5004061 (1991-04-01), Audruet
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