Brake valve for a hydraulic brake installation

Claim 2

A brake valve for a hydraulic brake installation, especially of a motor vehicle, which includes a master cylinder with a master piston in said master cylinder having a front side and a back side and actuatable by way of a piston rod, a pressure space on one side of said master piston in said master cylinder, means for connecting said pressure space with a brake, servo means for applying a controlled servo pressure to said pressure space as well as the back side of said piston, characterized in that the pressure space of the master piston is provided with a valve which is kept open during the actuation of the brake by the controlled servo pressure of said servo means and which, when open, connects the pressure space with pressure control valve means for controlling the servo pressure of said servo means.

Claim 3

A brake valve for a hydraulic brake installation, especially of a motor vehicle, which includes a master cylinder means with a master piston means having a front side and a back side and actuatable by way of a piston rod, a pressure space in said cylinder means adapted to be connected wiJh a brake, said pressure space as well as the back side of said piston means being adapted to be acted upon by a controlled servo pressure, characterized in that the pressure space of the master piston means is provided with a valve means which is kept open during the actuation of the brake by the controlled servo pressure and which, when open, connects the pressure space with a pressure control valve means controlling the servo pressure, a main spring displaceable by the master piston means is arranged in the master cylinder means, a spring plate means is provided at the free end of the main spring, said spring plate means being mounted on a substantially coaxial plunger means of a plate valve means that is constituted by a plate member at the end of the plunger means and a piston is displaceable against a spring, said piston together with a connection for a pressure accumulator forming part of the pressure control valve means, which is in communication with the pressure space of the master piston means by way of a substantially axial piston bore in said piston, a bore is provided in the plate member and bores in the plunger mPans, the piston bore having at its end cooperating with the plate member a cross-sectional area that is larger than the cross-sectional area of the plunger means.

Claim 4

A brake valve for a hydraulic brake installation, especially of a motor vehicle, which includes a master cylinder means with a master piston means having a front side and a back side and actuatable by way of a piston rod, a pressure space in said cylinder means adapted to be connected wiJh a brake, said pressure space as well as the back side of said piston means being adapted to be acted upon by a controlled servo pressure, characterized in that the pressure space of the master piston means is provided with a valve means which is kept open during the actuation of the brake by the controlled servo pressure and which, when open, connects the pressure space with a pressure control valve means controlling the servo pressure, a main spring displaceable by the master piston means is arranged in the master cylinder means, a spring plate means is provided at the free end of the main spring, said spring plate means being mounted on a substantially coaxial plunger means of a plate valve means that is constituted by a plate member at the end of the plunger means and a piston is displaceable against a spring, said piston together with a connection for a pressure accumulator forming part of the pressure control valve means, which is in communication with the pressure space of the master piston means by way of a substantially axial piston bore in said piston, a bore is provided in the plate member and bores in the plunger mPans, the piston bore having at its end cooperating with the plate member a cross-sectional area that is larger than the cross-sectional area of the plunger means.

Claim 5

A brake valve according to claim 2, characterized in that the connection through the plunger means between the pressure space of the master piston means and the pressure control valve means is adapted to be closed by the spring plate means.

Claim 6

A brake valve according to claim 3, characterized in that the spring plate means is provided with a knife edge ring to which is coordinated a sealing ring which is provided in a ring means guiding the plunger means.

Claim 7

A brake valve according to claim 4, characterized in that the plunger means is surrounded by a fixing spring which is supported at the spring plate means and the ring means.

Claim 8

A brake valve according to claim 5, characterized in that the piston is guided in a valve sleeve means which is provided with radial channel means adapted to be connected with the pressure accumulator.

Claim 9

A brake valve according to claim 6, characterized in that the piston together with the channel means forms a slide valve and is provided with radial bores leading to the piston bore.

Claim 10

A brake valve according to claim 6, characterized in that the piston together with the valve sleeve means forms a cone valve.

Claim 11

A brake valve according to claim 6, characterized in that a control valve device is connected to the pressure space of the master piston means which includes a piston whose back side is provided with a needle means and which is connected to the pressure control valve means in front of the plate valve means.

Claim 12

A brake valve according to claim 9, characterized in that the control valve device includes a check Valve adapted to the opened by means of the needle means of its piston, said check-valve being disposed in a connection between the back side of the maser piston means and a tank and being operable to open in case of a vacuum on the back side of the master piston means.

Claim 13

A brake valve according to claim 10, characterized in that the front side and back side of the piston of the control valve device are constructed as knife edge valves.

Claim 14

A brake valve according to claim 10, characterized in that the back side of the master piston means is connected with the pressure control valve means in front of the plate valve means by way of a line in which is arranged a check valve that is prestressed to a predetermined pressure valve and which opens in case of an excess pressure in the pressure control valve means.

Claim 15

A brake valve according to claim 12, characterized in that the back Side of the master piston means is connected with the pressure control valve means in front of the plate valve means by way of a line in which is arranged a check valve opening in case of an excess pressure on the back side of the master piston means.

Claim 16

A brake valve for a two circuit brake system according to claim 13, characterized in that two similar master cylinder means are arranged one above the other which are connected to a common brake pedal by way of a scale beam-like equalization lever means.

Claim 17

A brake valve according to claim 14, characterized in that a common valve housing is provided for the two master cylinder means.

Claim 18

A brake valve according to claim 15, characterized in that the two brake circuits include within the common housing identical components as to the respective brake valve parts thereof.

Claim 19

A brake valve according to claim 2, characterized in that the spring plate means is provided with a knife edge ring to which is coordinated a sealing ring which is provided in a ring means guiding the plunger means.

Claim 20

A brake valve according to claim 17, characterized in that the plunger means is surrounded by a fixing spring which is supported at the spring plate means and the ring means.

Claim 21

A brake valve according to claim 2, characterized in that the piston is guided in a valve sleeve means which is provided with radial channel means adapted to be connected with the pressure accumulator.

Claim 22

A brake valve according to claim 19, characterized in that the pistons together with the channel means forms a slide valve and is provided with radial bores leading to the piston bore.

Claim 23

A brake valve according to claim 19, characterized in that the piston together with the valve sleeve means forms a cone valve.

Claim 24

A brake valve according to claim 2, characterized in that a control valve device is connected to the pressure space of the master piston means which includes a piston whose back side is provided with a needle means and which is connected to the pressure control valve means in front of the plate valve means.

Claim 25

A brake valve according to claim 22, characterized in that the control valve device includes a check valve adapted to be opened by means of the needle means of its piston, said check-valve being disposed in a connection between the back side of the master piston means and a tank and being operable to open in case of a vacuum on the back side of the master piston means.

Claim 26

A brake valve according to claim 22, characterized in that the front side and backside of the piston of the control valve device are constructed as knife edge valves.

Claim 27

A brake valve according to claim 22, characterized in that the back side of the master piston means is connected with the pressure control valve means in front of the plate valve means by way of a line in which is arranged a check valve that is prestressed to a predetermined pressure value and which opens in case of an excess pressure in the pressure control valve means.

Claim 28

A brake valve according to claim 22, characterized in that the back side of the master piston means is conNected with the pressure control valve means in front of the plate valve means byway of a line in which is arranged a check valve opening in case of an excess pressure on the backside of the master piston means.

Claim 29

A brake valve according to claim 26, characterized in that the back side of the master piston means is connected with the pressure control valve means in front of the plate valve means by way of a line in which is arranged a check valve that is prestressed to a predetermined pressure value and which opens in case of an excess pressure in the pressure control valve means.

Claim 30

A brake valve according to claim 27, characterized in that the control valve device includes a check valve adapted to be opened by means of the needle means of its piston, said check-valve being disposed in a connection between the back side of the master piston meanS and a tank and being operable to open in case of a vacuum on the back side of the master piston means.

Claim 31

A brake valve for a two circuit brake system according to claim 1, characterized in that two similar master cylinder means are arranged one above the other which are connected to a common brake pedal by way of a scale beam-like equalization lever means.

Claim 32

A brake valve according to claim 29, characterized in that a common valve housing is provided for the two master cylinder means.

Claim 33

A brake valve according to claim 30, characterized in that the two brake circuits include within the common housing identical components as to the respective brake valve parts thereof.