Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1995-04-06
1997-12-02
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
1375395, 188195, 188349, 303 969, 303 228, 303 841, B60T 818, B60T 1134
Patent
active
056928122
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a brake regulator, intended to be interposed between a source of hydraulic pressure and a braking circuit of a motor vehicle and including a casing provided with at least one bore; a hydraulic piston sliding in this bore and therein delimiting first and second pressure chambers separated from one another by valve means carried by this piston, the first and second chambers being capable of being connected respectively to the source of pressure and to the braking circuit; and a push rod acting on the valve means in a direction capable of allowing the opening thereof when a relatively low pressure prevails in the second chamber, the piston sliding in the bore, under the action of an increase in pressure in this second chamber, in a direction capable of moving the push rod away from the valve means and correspondingly allowing closure thereof, these valve means comprising a first ball of predetermined diameter, urged by a first spring in the direction both of the push rod and of a first seat formed inside the piston.
Regulators of this type are known in the prior art, such as illustrated, for example, by the patent documents U.S. Pat. No. 4,615,566; U.S. Pat. No. 4,624,507; and EP 0,223,641.
One of the problems encountered in the production of regulators of this type lies in the fact that the brake fluid is often contaminated by all sorts of dirt, which can oppose the closure of the valve and consequently prevent it from fulfilling its function.
Although it is known to interpose filters in the path of the brake fluid, in order to solve this problem, this solution remains not very satisfactory insofar as the filters easily trap quite significant quantities of air, which themselves disturb the correct operation of the hydraulic braking circuit.
Moreover, the operation of a brake regulator is generally accompanied by a noticeable noise, which motor vehicle manufacturers are seeking to eliminate.
Within this context, the object of the invention is to propose a silent and robust regulator, capable of operating without failure, even in the absence of a filter for the brake fluid.
To this end, the regulator of the invention is essentially characterized in that the valve means comprise a second ball interposed between the first ball and the push rod, interacting with a second seat formed inside the piston, and urged by a second spring in the direction both of the push rod and of the second seat, this second ball being moved away from the second seat by the push rod and itself moving the first ball away from the first seat when a relatively low pressure prevails in the second chamber, and the distance separating the two balls, when they are applied to their respective seats, being less than the possible sliding travel of the piston in the bore.
According to the simplest embodiment of the invention, the second spring is compressed between the two balls and the two springs exhibit different stiffnesses, the stiffness of the second spring being less than that of the first, and the second ball exhibits a diameter less than the diameter of the first ball.
Other characteristics and advantages of the invention will emerge clearly from the description thereof which is given hereafter, by way of non-limiting indication, with reference to the appended drawings, in which:
FIG. 1 is an overall sectional view of a regulator in accordance with the invention;
FIG. 2 is an enlarged detail view of a part of FIG. 1, representing the piston in a first position;
FIG. 3 is an enlarged detail view of a part of FIG. 1, representing the piston in a second position;
FIG. 4 is an enlarged detail view of a part of FIG. 1, representing the piston in a third position;
FIG. 5 is an enlarged detail view of a part of FIG. 1, representing a second possible embodiment of the piston; and
FIG. 6 is an enlarged detail view of a part of FIG. 1, representing a third possible embodiment of the piston.
As shown in FIG. 1, the invention relates to a brake regulator 1, intended to be interposed between a source of hydraulic pres
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Bosch Systemes de Freinage
Butler Douglas C.
McCormick Jr. Leo H.
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