Hydraulic brake system
First Claim
1. A hydraulic brake system having at least a single circuit for a motor vehicle, the brake system including a brake pedal means, a master brake cylinder means, a plurality of wheel brake cylinders, and individual brake circuit means for connecting the master brake cylinder means with the respective wheel brake cylinders, a pressure modulator means disposed in each of the individual brake circuit means between the master brake cylinder means and the respective wheel brake cylinders, wherein means are provided for causing an actuation of the pressure modulator means so as to enable a building up of a pressure in the individual brake circuit means when the brake system is not operated by the brake pedal means, and characterized in that the pressure modulator means includes a stepped housing means, a stepped piston adapted to the housing means is displaceably mounted in the housing means, the stepped piston includes a large piston portion and a small piston portion, a pair of axially spaced sealing means are disposed on the small piston portion, means are provided for connecting the housing means with the master brake cylinder means, one of said sealing means is adapted to selectively open and close the means for connecting the housing means with the master brake cylinder means, a first pressure chamber means is provided in the housing and is cooperable with the large piston portion, a second pressure chamber means is provided in the housing means for the small piston portion, means are provided for connecting the second pressure chamber to the individual brake circuit means, and in that means are provided for connecting the first pressure chamber means with the means for causing an actuation of the pressure modulator means.
1 Assignment
0 Petitions
Accused Products
Abstract
A hydraulic single-current or multiple-circuit brake system, preferably for a motor vehicle, which brake system includes a master brake cylinder operated by a brake pedal and individual brake circuits leading from the master brake cylinder to wheel brake cylinders. An accumulator is provided for enabling a build-up of pressure in the brake circuits when the brake pedal is not operated, with the build-up in pressure being controlled by a control unit such as a forward drive control, a distance control, or the like. A pressure modulator is installed in each of the individual brake circuits leading to the wheel brake cylinders at a position between the master brake cylinder and the wheel brake cylinder.
8 Citations
14 Claims
- 1. A hydraulic brake system having at least a single circuit for a motor vehicle, the brake system including a brake pedal means, a master brake cylinder means, a plurality of wheel brake cylinders, and individual brake circuit means for connecting the master brake cylinder means with the respective wheel brake cylinders, a pressure modulator means disposed in each of the individual brake circuit means between the master brake cylinder means and the respective wheel brake cylinders, wherein means are provided for causing an actuation of the pressure modulator means so as to enable a building up of a pressure in the individual brake circuit means when the brake system is not operated by the brake pedal means, and characterized in that the pressure modulator means includes a stepped housing means, a stepped piston adapted to the housing means is displaceably mounted in the housing means, the stepped piston includes a large piston portion and a small piston portion, a pair of axially spaced sealing means are disposed on the small piston portion, means are provided for connecting the housing means with the master brake cylinder means, one of said sealing means is adapted to selectively open and close the means for connecting the housing means with the master brake cylinder means, a first pressure chamber means is provided in the housing and is cooperable with the large piston portion, a second pressure chamber means is provided in the housing means for the small piston portion, means are provided for connecting the second pressure chamber to the individual brake circuit means, and in that means are provided for connecting the first pressure chamber means with the means for causing an actuation of the pressure modulator means.
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2. A hydraulic brake system having at least a single circuit for a motor vehicle, the brake system including a brake pedal means, a master brake cylinder means, a plurality of wheel brake cylinders, and individual brake circuit means for connecting the master brake cylinder means with the respective wheel brake cylinders, characterized by a pressure modulator means disposed in each of the individual brake circuit means between the master brake cylinder means and the respective wheel brake cylinders, wherein means are provided for causing an actuation of the pressure modulator means so as to enable a building up of a pressure in the individual brake circuit means when the brake system is not operated by the brake pedal means, and the means for causing an actuation of the pressure modulator means includes a control unit, and characterized in that the pressure modulator means includes a stepped housing means, a stepped piston adapted to the housing means is displaceably mounted in the housing means, the stepped piston includes a large piston portion and a small piston portion, a pair of axially spaced sealing means are disposed on the small piston portion, means are provided for connecting the housing means with the master brake cylinder means, one of said sealing means is adapted to selectively open and close the means for connecting the housing means with the master brake cylinder means, a first pressure chamber means is provided in the housing and is cooperable with the large piston portion, a second pressure chamber means is provided in the housing means for the small piston portion, means are provided for connecting the second pressure chamber to the individual brake circuit means, and in that means are provided for connecting the first pressure chamber means with the means for causing an actuation of the pressure modulator means.
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3. A hydraulic brake system having at least a single circuit for a motor vehicle, the brake system including a brake pedal means, a master brake cylinder means, a plurality of wheel brake cylinders, and individual brake circuit means for connecting the master brake cylinder means with the respective wheel brake cylinders, a pressure modulator means disposed in each of the individual brake circuit means between the master brake cylinder means and the respective wheel brake cylinders, wherein means are provided for causing an actuation of the pressure modulator means so as to enable a building up of a pressure in the individual brake circuit means when the brake system is not operated by the brake pedal means, the means for causing an actuation of the pressure modulator means includes a control unit, and the control unit is at least one of a drive control means and a distance control means of the motor vehicle, and characterized in that the pressure modulator means includes a stepped housing means, a stepped piston adapted to the housing means is displaceably mounted in the housing means, the stepped piston includes a large piston portion and a small piston portion, a pair of axially spaced sealing means are disposed on the small piston portion, means are provided for connecting the housing means with the master brake cylinder means, one of said sealing means is adapted to selectively open and close the means for connecting the housing means with the master brake cylinder means, a first pressure chamber means is provided in the housing and is cooperable with the large piston portion, a second pressure chamber means is provided in the housing means for the small piston portion, means are provided for connecting the second pressure chamber to the individual brake circuit means, and in that means are provided for connecting the first pressure chamber means with the means for causing an actuation of the pressure modulator means.
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4. A hydraulic brake system having at least one individual brake circuit and a pressure modulator means comprising
stepped housing means, a stepped piston adapted to the housing means is displaceably mounted in the housing means, the stepped piston includes a large piston portion and a small piston portion, a pair of axially spaced sealing means are disposed on the small piston portion, means are provided for connecting the housing means with a master brake cylinder means, one of the said sealing means is adapted to selectively open and close the means for connecting the housing means with the master brake cylinder means, a first pressure chamber means is provided in the housing and is cooperable with the large piston portion, a second pressure chamber means is provided in the housing means for the small piston portion, means are provided for connecting the second pressure chamber to the individual brake circuit means, and in that means are provided for connecting the first pressure chamber means with a means for causing an actuation of the pressure modulator means.
Specification