Full power braking system with skid control and redundant power steering

Claim 2

A unitary assembly integrating two braking functions comprising, an operator-actuated master cylinder for selectively generating braking pressure, a rotary skid control pump operable as a function of rotational wheel speed forming a power source for generating braking pressure, a rotary power steering pump forming an auxiliary power source for braking modes when the skid control pump is unable to provide the required power, and a valving means having a tandem throttle valve for regulating the application of pump-generated power to the braking motors in response to actuation of the master cylinder and including additional valving means to transfer the acting power source from one pump to the other.

Claim 3

In combination, braking motor means, a first pump operable as a function of rotational wheel speed and constituting a skid control pump, a second pump constituting a power steering pump and forming an auxiliaRy power source to back up the skid control pump, a master cylinder having a push rod adapted to be actuated selectively by an operator, and a hydraulic booster having valving means operated by said push rod including a tandem throttle valve operable to control the flow of fluid from said first and second pumps to supplement master cylinder pressure, said valving means operable to transfer steering power requirements to the skid control pump in the event of a failure of the power steering pump.

Claim 4

In combination, braking motor means, a first pump operable as a function of rotational wheel speed and constituting a skid control pump, a second pump constituting a power steering pump and forming an auxiliaRy power source to back up the skid control pump, a master cylinder having a push rod adapted to be actuated selectively by an operator, and a hydraulic booster having valving means operated by said push rod including a tandem throttle valve operable to control the flow of fluid from said first and second pumps to supplement master cylinder pressure, said valving means operable to transfer steering power requirements to the skid control pump in the event of a failure of the power steering pump.

Claim 5

For use in a hydraulic skid control system, a power booster comprising, a tandem spool-type throttle valve adapted to be actuated by a master cylinder push rod and having a pair of tapered lands cooperable with a primary port and a secondary port, respectively, and operable to close said ports in unison, thereby to provide a virtual linear pressure build-up upon axial movement of the spool.

Claim 6

For use in a hydraulic skid control system, a power booster comprising, a tandem spool-type throttle valve adapted to be actuated by a master cylinder push rod and having a pair of tapered lands cooperable with a primary port and a secondary port, respectively, and operable to close said ports in unison, thereby to provide a virtual linear pressure build-up upon axial movement of the spool.

Claim 7

A power booster for a braking system with skid control comprising, a valve body having a valve bore extending therethrough and further including a manifold formed with passages and lines and a manifold cover therefor, a master cylinder having a master cylinder plunger operable upon actuation thereof to transmit pressure to the brake motors of a wheeled vehicle, a power source for transmitting pressure generated externally to said valve body thereby to supplement pressures acting on said master cylinder plunger, a plurality of valve elements in said valve bore to control the application of said pressure as a function of desired wheel slip, and a push rod adapted to be actuated by an operator and forming together with said valve elements a solid mechanical train link for fail-safe push-through operation of said master cylinder plunger.

Claim 8

A power booster for a braking system with skid control comprising, a valve body having a valve bore extending therethrough and further including a manifold formed with passages and lines and a manifold cover therefor, a master cylinder having a master cylinder plunger operable upon actuation thereof to transmit pressure to the brake motors of a wheeled vehicle, a power source for transmitting pressure generated externally to said valve body thereby to supplement pressures acting on said master cylinder plunger, a plurality of valve elements in said valve bore to control the application of said pressure as a function of desired wheel slip, and a push rod adapted to be actuated by an operator and forming together with said valve elements a solid mechanical train link for fail-safe push-through operation of said master cylinder plunger.

Claim 9

An hydraulic booster for a skid control braking system comprising, hydraulic braking means including a master cylinder having a piston for supplying hydraulic pressure to the brake motor means of a vehicle, a push rod having actuating means for receiving operator input whenever braking is desired, valve means interposed between said master cylinder piston and said push rod, a skid control pump driven as a function of rotational wheel speed for generating a primary hydraulic input to said valve means, and a power steering pump driven as a function of engine speed for generating an auxiliary hydraulic input to said valve means for use in the event of failure of said skid control pump, said valve means comprising a throttle valve for throttling the supply of liquid to pressure load the master cylinder piston.

Claim 10

An hydraulic booster for a skid control braking system comprising, hydraulic braking means including a master cylinder having a piston for supplying hydraulic pressure to the brake motor means of a vehicle, a push rod having actuating means for receiving operator input whenever braking is desired, valve means interposed between said master cylinder piston and said push rod, a skid control pump driven as a function of rotational wheel speed for generating a primary hydraulic input to said valve means, and a power steering pump driven as a function of engine speed for generating an auxiliary hydraulic input to said valve means for use in the event of failure of said skid control pump, said valve means comprising a throttle valve for throttling the supply of liquid to pressure load the master cylinder piston.

Claim 11

An hydraulic booster as defined in claim 5 and further characterized by said throttle valve having a spool formed with tapered lands and cooperable with an adjacent port to provide a virtual linear pressure build-up with spool travel.

Claim 12

Valve means for interposition between a master cylinder piston and an operator-actuated push rod comprising, a tandem throttle spool valve having two tapered spool sections controlling a primary port and an auxiliary port receiving hydraulic fluid respectively from a primary source and an auxiliary source, whereby the tapered spool sections provide a virtual linear pressure build up of hydraulic input with axial adjustment of the spool, and a pressure-compensating valve supported in an inner bore of said throttle spool valve for metering out the hydraulic input as a function of pressure, thereby to provide controlled slip when the hydraulic fluid pressure is used for braking the wheels of a vehicle.

Claim 13

Valve means for interposition between a master cylinder piston and an operator-actuated push rod comprising, a tandem throttle spool valve having two tapered spool sections controlling a primary port and an auxiliary port receiving hydraulic fluid respectively from a primary source and an auxiliary source, whereby the tapered spool sections provide a virtual linear pressure build up of hydraulic input with axial adjustment of the spool, and a pressure-compensating valve supported in an inner bore of said throttle spool valve for metering out the hydraulic input as a function of pressure, thereby to provide controlled slip when the hydraulic fluid pressure is used for braking the wheels of a vehicle.

Claim 14

In combination with a wheeled vehicle, a rotary pump forming a braking power source and having a driven connection to rotate in unison with the wheels of the vehicle, said pump having an inlet and an outlet and a bypass passage therebetween, means forming a discharge orifice through which all of the liquid pumped is discharged, a flow regulating valve of the differential type in control of said bypAss passage and operable as a function of the pressure drop across said orifice, hydraulic braking means receiving liquid under pressure from said pump for selectively applying a deceleration bias to the wheels of the vehicle, a throttle valve for throttling the supply of liquid to the hydraulic braking means as a function of wheel speed, and a pressure-compensating valve to meter out liquid from the supply of liquid directed to the hydraulic braking means as a function of pressure, thereby inducing rotational slippage of the wheels in an optimum controlled range, a power steering system for the vehicle including a power steering pump, and valving means for utilizing said power steering pump as an auxiliary braking power source when said rotary pump is unable to provide the required power.

Claim 15

In combination with a wheeled vehicle, a rotary pump forming a braking power source and having a driven connection to rotate in unison with the wheels of the vehicle, said pump having an inlet and an outlet and a bypass passage therebetween, means forming a discharge orifice through which all of the liquid pumped is discharged, a flow regulating valve of the differential type in control of said bypAss passage and operable as a function of the pressure drop across said orifice, hydraulic braking means receiving liquid under pressure from said pump for selectively applying a deceleration bias to the wheels of the vehicle, a throttle valve for throttling the supply of liquid to the hydraulic braking means as a function of wheel speed, and a pressure-compensating valve to meter out liquid from the supply of liquid directed to the hydraulic braking means as a function of pressure, thereby inducing rotational slippage of the wheels in an optimum controlled range, a power steering system for the vehicle including a power steering pump, and valving means for utilizing said power steering pump as an auxiliary braking power source when said rotary pump is unable to provide the required power.

Claim 16

In combination with a wheeled vehicle as defined in claim 8, said valving means including means to permit said rotary pump to supply power steering requirements in the event of failure of said power steering pump.

Claim 17

An hydraulic skid control comprising, hydraulic braking means for applying a decel bias to the wheels of a vehicle, a wheel-driven pump for generating a wheel feed primary hydraulic input, an engine-driven pump for generating an auxiliary hydraulic input, control means for suppressing the decel bias with a controlled percent of wheel slippage, said control means comprising valving means for reducing said hydraulic input as a function of flow, said valving means further comprising a variable orifice pressure-compensating valve for metering out said hydraulic input as a function of pressure and for using the auxiliary power source when the wheel-driven pump is unable to provide the required hydraulic input.

Claim 18

An hydraulic skid control comprising, hydraulic braking means for applying a decel bias to the wheels of a vehicle, a wheel-driven pump for generating a wheel feed primary hydraulic input, an engine-driven pump for generating an auxiliary hydraulic input, control means for suppressing the decel bias with a controlled percent of wheel slippage, said control means comprising valving means for reducing said hydraulic input as a function of flow, said valving means further comprising a variable orifice pressure-compensating valve for metering out said hydraulic input as a function of pressure and for using the auxiliary power source when the wheel-driven pump is unable to provide the required hydraulic input.

Claim 19

In combination with a wheeled vehicle, means forming a closed hydraulic circuit, a positive displacement pump at one point in said circuit, wheel-actuated driving means for driving said pump and pressurizing the liquid to develop a wheel feed input for said circuit which is related to rotational wheel speed, master cylinder piston means at a second point in said circuit receiving liquid from said pump to apply a decel bias to the wheel braking motors, and decel bias suppression means to control the slip of the wheels at a regulated percent with respect to wheel speed, an engine-driven power steering pump for the vehicle, a push rod adapted to be actuated by an operator, and means to utilize said power steering pump as an auxiliary braking power source comprising valving means interposed between said master cylinder piston and said push rod and disposed to be actuated thereby for selectively supplying hydraulic input to the master cylinder piston, said valving means forming a solid mechanical link for push-through operation of said master cylinder piston in the event of a pressure failure.

Claim 20

In combination with a wheeled vehicle, means forming a closed hydraulic circuit, a positive displacement pump at one point in said circuit, wheel-actuated driving means for driving said pump and pressurizing the liquid to develop a wheel feed input for said circuit which is related to rotational wheel speed, master cylinder piston means at a second point in said circuit receiving liquid from said pump to apply a decel bias to the wheel braking motors, and decel bias suppression means to control the slip of the wheels at a regulated percent with respect to wheel speed, an engine-driven power steering pump for the vehicle, a push rod adapted to be actuated by an operator, and means to utilize said power steering pump as an auxiliary braking power source comprising valving means interposed between said master cylinder piston and said push rod and disposed to be actuated thereby for selectively supplying hydraulic input to the master cylinder piston, said valving means forming a solid mechanical link for push-through operation of said master cylinder piston in the event of a pressure failure.