Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1995-03-20
1996-09-03
Bonck, Rodney H.
Machine element or mechanism
Control lever and linkage systems
Elements
74512, 16DIG6, G05G 114
Patent
active
055513174
DESCRIPTION:
BRIEF SUMMARY
The present invention has as its subject a pedal device for a motor vehicle, particularly but not exclusively for a motor vehicle brake system.
More precisely, the invention relates to a pedal device as defined in the preamble of the main claim.
In a motor vehicle, braking is controlled by the driver by means of a pedal which transmits, usually through the intermediary of a booster, the control of braking to the master cylinder, the latter producing the effective actuation of the brakes.
FIG. 1 shows in simplified manner such a brake system. The pedal 10 is shown which is attached to the end of a first rod 12 and the second end 14 of which is articulated about an axis fixed with respect to the body 16 of the motor vehicle. The movements of the pedal 10 are transmitted through the intermediary of a control rod 18 articulated at 20 with respect to the first rod 12. The control rod 18 is extended at 22 into the brake-booster 24. As is well known, the booster 24 consists essentially of a casing 26 in which is mounted a piston 28 and a piston skirt 30 which, associated with a deformable diaphragm, separates the casing 26 into two chambers 32 and 34. Under the effect of the movements of the rod 22, it is possible to place the chamber 32 either under partial vacuum, or under atmospheric pressure. The placing of the chamber 32 under atmospheric pressure under the effect of the rod 22 causes the movement of the piston skirt 30 which controls the master cylinder 38 through the intermediary of the thrust rod 40.
The type of mechanical connection between the first rod and the control rod 18 of the pedal system per se offers great safety and high reliability. However, the assembly has the disadvantage that the vibrations of the engine, and more generally of the motor vehicle, are transmitted to the pedal 10. In fact, in these systems, there always exist clearances which allow the rod 12 to be set in final vibration. This vibration presents no risk as to the safety of the braking system but they are unpleasant to the foot of the motorist and in addition they cause noises to be produced which impair the comfort of the motorist in his or her vehicle.
The document DE-U-8,816,385 describes a device which seeks to solve this problem but which in fact does not enable the noises associated with the vibrations of the pedal in a plane perpendicular to the direction of its actuation to be avoided.
One object of the present invention is to provide a pedal device for a motor vehicle, in particular for the brake system of the latter, which palliates the above-mentioned disadvantages and which, in particular, avoids or very substantially reduces the transmission of vibrations from the engine to the pedal, particularly to the brake pedal.
In order to achieve this object, the pedal device of the invention for a motor vehicle, which comprises resilient means for holding part of the wall of the aperture of the first rod against the facing part of said pivot pin, is essentially characterized in that the resilient means comprise means for substantially immobilizing the first rod in translation relative to said yoke in the direction of the pivot pin.
It will be understood that the transmission is thus avoided of vibrations resulting not only from the clearance between the first rod and the pivot pin in the direction of actuation of the pedal, but also from the clearance in the direction of the pivot pin.
According to a first embodiment of the invention, the resilient means comprise a part of resilient material, for example of elastomeric material or of rubber, and mechanical means for maintaining the part of resilient material against the second side of the first rod.
According to a second embodiment of the invention, the resilient means comprise a spring-forming member, the ends of which are securely attached to the yoke and a middle portion of which is applied onto the second side of the first rod.
Several embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 alre
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Gautier Jean-Pierre
Perez Revilla Miguel
Verbo Ulysse
AlliedSignal Europe Services Techniques
Bonck Rodney H.
Kim Chong H.
McCormick Jr. Leo H.
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