Hydraulic brake system with an antiskid control apparatus
AssigneeITT Industries, Inc.
InventorJuan Belart
Life of this patent
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Abstract
Brake systems having an antiskid control apparatus are known in which pressure fluid is additionally supplied from a dynamic circuit into the static brake circuit when pressure fluid has been taken therefrom due to an antiskid control operation. In this situation, the known systems were not able to maintain the master cylinder pressure at a constant value. Therefore, according to the present invention a valve device is provided which is acted upon by the static master cylinder pressure in the opening direction and by the dynamic auxiliary pressure in the closing direction.
Claims13
A hydraulic brake system having an antiskid control apparatus comprising:
- a master brake cylinder;
- a fluid return line;
- at least one wheel brake cylinder;
- antiskid control valves coupled to said master cylinder, said wheel cylinder and said return line to connect said wheel cylinder to one of said master cylinder and said return line;
- and
- a valve device coupled to a fluid source, said master cylinder and said return line to connect fluid from said fluid source to said wheel brake cylinder through a passage in said valve device and at least one check valve opening in opposition to master cylinder pressure, said valve device being controlled by a piston having a first end surface acted upon by said master cylinder pressure in the sense of opening said passage in said valve device and a second end surface acted upon by the pressure of said fluid of said source in the sense of closing said passage in said valve device.
A hydraulic brake system having an antiskid control apparatus comprising:
- a master brake cylinder;
- a fluid return line;
- at least one wheel brake cylinder;
- antiskid control valves coupled to said master cylinder, said wheel cylinder and said return line to connect said wheel cylinder to one of said master cylinder and said return line;
- and
- a valve device coupled to a fluid source, said master cylinder and said return line to deliver fluid from said fluid source to said wheel brake cylinder through at least one check valve opening in opposition to master cylinder pressure, said valve device being controlled by a piston having a first end surface acted upon by said master cylinder pressure in the sense of opening said valve device and a second end surface acted upon by the pressure of said fluid of said source in the sense of closing said valve device;
- said piston acting as a valve slide to connect an inlet in a housing of said valve device coupled to said source to an outlet in said housing coupled to said check valve through a first portion of a channel system contained in said piston, said piston being adapted to close said inlet under predetermined conditions.
Dependencies are inferred from the claim text.