초록 ▼

An hydraulic anti-skid braking system for vehicles is disclosed in which a supply of operating fluid from a master cylinder to a vehicle brake is modulated by a modulator assembly in accordance with signals from a skid sensing device. The modulator assembly incorporates an expansion chamber and an h

An hydraulic anti-skid braking system for vehicles is disclosed in which a supply of operating fluid from a master cylinder to a vehicle brake is modulated by a modulator assembly in accordance with signals from a skid sensing device. The modulator assembly incorporates an expansion chamber and an hydraulic pump has a working chamber which is connected to the expansion chamber. A dump valve disposed between the expansion chamber and a reservoir for fluid is operable by the sensing device to regulate the pressure in the expansion chamber in accordance with the deceleration of the wheel braked by the brake. The pump is operable only to repressurize the expansion chamber following correction of a skid.

대표청구항 ▼

An hydraulic anti-skid braking system for a vehicle comprising a vehicle brake, a supply of operating fluid for applying said brake, skid sensing means for producing skid signals, a modulator assembly for modulating said supply of operating fluid to said brake in accordance with said skid signals fr

An hydraulic anti-skid braking system for a vehicle comprising a vehicle brake, a supply of operating fluid for applying said brake, skid sensing means for producing skid signals, a modulator assembly for modulating said supply of operating fluid to said brake in accordance with said skid signals from said skid sensing means, said modulator assembly incorporating an expansion chamber, an hydraulic pump incorporating a plunger working in a bore having a working chamber which is connected to said expansion chamber, a reservoir for fluid, positive drive means for urging said pump plunger in a first direction to draw fluid from said reservoir into said working chamber during a suction stroke, and pump operating means for applying a force to said plunger to urge said plunger in a second opposite direction to pump fluid from said working chamber into said expansion chamber during a delivery stroke, a dump valve disposed between said expansion chamber and said reservoir for fluid, the dump valve being movable by said skid-sensing means between a normally closed position in which said expansion chamber is pressurised so that said modulator assembly is held in a first position permitting operating fluid to be supplied to said brake and an open position when the skid signal is received whereby the pressure in said expansion chamber is reduced so that the modulator assembly can move into a second position to cut-off communication between said supply and said brake and subsequently reduce the pressure of fluid supplied to said brake, pressurisation of said expansion chamber following correction of a skid with said dump valve in said closed position being limited by said force applied to said plunger by said pump operating means whereafter said plunger is adapted to be held disabled during the subsequent delivery stroke by a volume of fluid trapped between said modulator assembly and said plunger, whereby said pump is operable only to repressurise said expansion chamber following correction of a skid.