Brake anti-skid system

Claim 2

In an acceleration comparing apparatus for an anti-skid device of a wheeled vehicle, the combination comprising means to sense linear deceleration of the vehicle, means to sense angular deceleration of a vehicle wheel, and means to mechanically compare the linear deceleration of the vehicle sensed by said linear sensing means with the angular deceleration sensed by said angular sensing means, said angular decleration sensing means including a rotary input shaft, drive train means including a first gear driven by said rotary input shaft, and a second gear driven by said first gear, a rotational inertia body driven with said second gear, said drive train means including torque limiting means adapted to limit torque transmitted between said input shaft and said inertia body whereby said apparatus is protected from excessive forces otherwise developed through rapid changes of speed of said rotational inertia body.

Claim 3

In an acceleration comparing apparatus for an anti-skid device of a wheeled vehicle, the combination comprising means to sense linear deceleration of the vehicle, means to sense angular deceleration of a vehicle wheel, and means to mechanically compare the linear deceleration of the vehicle sensed by said linear sensing means with the angular deceleration sensed by said angular sensing means, said angular deceleration sensing means including a rotary input shaft, drive train means including a first gear driven by said rotary input shaft, and a second gear driven by said first gear, a rotational inertia body driven by said second gear, said drive train means including spring means operably connected between said input shaft and said inertia body for storing energy for use in extending a period in which said angular deceleration sensing means influences said comparing means beyond the time actual angular deceleration becomes proportionately equal to linear deceleration.

Claim 4

In an acceleration comparing apparatus for an anti-skid device of a wheeled vehicle, the combination comprising means to sense linear deceleration of the vehicle, means to sense angular deceleration of a vehicle wheel, and means to mechanically compare the linear deceleration of the vehicle sensed by said linear sensing means with the angular deceleration sensed by said angular sensing means, said angular deceleration sensing means including a rotary input shaft, drive train means including a first gear driven by said rotary input shaft, and a second gear driven by said first gear, a rotational inertia body driven by said second gear, said drive train means including spring means operably connected between said input shaft and said inertia body for storing energy for use in extending a period in which said angular deceleration sensing means influences said comparing means beyond the time actual angular deceleration becomes proportionately equal to linear deceleration.

Claim 5

An anti-skid device for a wheeled vehicle comprising a substantially enclosed housing, means to maintain said enclosed housing at substantially atmospheric pressure, mechanical inertia means to sense a non-proportional change in linear and angular deceleration of a vehicle wheel defining a skid condition, means for mounting the mechanical inertia means in the housing, the inertia means including a control member displaceable from a normal position in the housing to a second position in response to a skid condition evidenced by excessive angular deceleration of a wheel in relation to linear vehicle deceleration, vacuum control means including means to regulate hydraulic pressure in a brake control line of the vehicle to reduce wheel braking force when said control member is in said second position, said vacuum control means including port means in the housing, said displaceable control member having port sealing surface means movable into and out of sealing cooperation with said vacuum port means as it is displaced between said normal position and said skid position, and a control chamber associated with said port means maintained at subatmospheric pressure when said control member is in said normal position and substantially at atmospheric pressure when said control member is in said second position.

Claim 6

An anti-skid device for a wheeled vehicle comprising a substantially enclosed housing, means to maintain said enclosed housing at substantially atmospheric pressure, mechanical inertia means to sense a non-proportional change in linear and angular deceleration of a vehicle wheel defining a skid condition, means for mounting the mechanical inertia means in the housing, the inertia means including a control member displaceable from a normal position in the housing to a second position in response to a skid condition evidenced by excessive angular deceleration of a wheel in relation to linear vehicle deceleration, vacuum control means including means to regulate hydraulic pressure in a brake control line of the vehicle to reduce wheel braking force when said control member is in said second position, said vacuum control means including port means in the housing, said displaceable control member having port sealing surface means movable into and out of sealing cooperation with said vacuum port means as it is displaced between said normal position and said skid position, and a control chamber associated with said port means maintained at subatmospheric pressure when said control member is in said normal position and substantially at atmospheric pressure when said control member is in said second position.

Claim 7

An anti-skid device for a wheeled vehicle comprising a substantially enclosed housing, mechanical inertia means to sense a non-proportional change in linear and angular deceleration of a vehicle wheel defining a skid condition, means for mounting the mechanical inertia means in the housing, the inertia means including a control member displAceable from a normal position in the housing to a second position in response to a skid condition evidenced by excessive angular deceleration of a wheel in relation to linear vehicle deceleration, vacuum control means including port means in the housing, said displaceable control member having port sealing surface means movable into and out of sealing cooperation with said vacuum port as it is displaced between said normal position and said skid position, said vacuum control means including means to regulate hydraulic pressure in a brake control line of the vehicle to reduce wheel braking force when said control member is in said second position, said mechanical inertia means including an inertia flywheel, mechanical drive means including a rotary input member, said rotary input member operably connected to drive the flywheel at a rotational speed proportional to the rotational speed of a wheel, and yieldable element means including a friction slip clutch operably connected between said flywheel and said rotary input member and limiting maximum torque transmitted therebetween.

Claim 8

An anti-skid device for a wheeled vehicle comprising a substantially enclosed housing, mechanical inertia means to sense a non-proportional change in linear and angular deceleration of a vehicle wheel defining a skid condition, means for mounting the mechanical inertia means in the housing, the inertia means including a control member displAceable from a normal position in the housing to a second position in response to a skid condition evidenced by excessive angular deceleration of a wheel in relation to linear vehicle deceleration, vacuum control means including port means in the housing, said displaceable control member having port sealing surface means movable into and out of sealing cooperation with said vacuum port as it is displaced between said normal position and said skid position, said vacuum control means including means to regulate hydraulic pressure in a brake control line of the vehicle to reduce wheel braking force when said control member is in said second position, said mechanical inertia means including an inertia flywheel, mechanical drive means including a rotary input member, said rotary input member operably connected to drive the flywheel at a rotational speed proportional to the rotational speed of a wheel, and yieldable element means including a friction slip clutch operably connected between said flywheel and said rotary input member and limiting maximum torque transmitted therebetween.

Claim 9

An anti-skid device for a wheeled vehicle comprising a substantially enclosed housing, mechanical inertia means to sense a non-proportional change in linear and angular deceleration of a vehicle wheel defining a skid condition, means for mounting the mechanical inertia means in the housing, the inertia means including a control member displaceable from a normal position in the housing to a second position in response to a skid condition evidenced by excessive angular deceleration of a wheel in relation to linear vehicle deceleration, vacuum control means including port means in the housing, said displaceable control member having port sealing surface means movable into and out of sealing cooperation with said vacuum port as it is displaced between said normal position and said skid position, said vacuum control means including means to regulate hydraulic pressure in a brake control line of the vehicle to reduce wheel braking force when said control member is in said second position, said mechanical inertia means including an inertia flywheel, mechanical drive means including a rotary input member, said rotary input member operably connected to drive the flywheel at a rotational speed proportional to the rotational speed of a wheel, and a spring member adapted to transmit torque between said input member and said flywheel and store energy for extending the period said control member is in said second position beyond a time when angular wheel deceleration and linear vehicle deceleration rates return to non-skid proportionality.

Claim 10

An anti-skid device for a wheeled vehicle comprising a substantially enclosed housing, mechanical inertia means to sense a non-proportional change in linear and angular deceleration of a vehicle wheel defining a skid condition, means for mounting the mechanical inertia means in the housing, the inertia means including a control member displaceable from a normal position in the housing to a second position in response to a skid condition evidenced by excessive angular deceleration of a wheel in relation to linear vehicle deceleration, vacuum control means including port means in the housing, said displaceable control member having port sealing surface means movable into and out of sealing cooperation with said vacuum port as it is displaced between said normal position and said skid position, said vacuum control means including means to regulate hydraulic pressure in a brake control line of the vehicle to reduce wheel braking force when said control member is in said second position, said mechanical inertia means including an inertia flywheel, mechanical drive means including a rotary input member, said rotary input member operably connected to drive the flywheel at a rotational speed proportional to the rotational speed of a wheel, and a spring member adapted to transmit torque between said input member and said flywheel and store energy for extending the period said control member is in said second position beyond a time when angular wheel deceleration and linear vehicle deceleration rates return to non-skid proportionality.

Claim 11

An anti-skid device for a wheeled vehicle comprising a substantially enclosed housing, mechanical inertia means to sense a non-proportional change in linear and angular deceleration of a vehicle wheel defining a skid condition, means for mounting the mechanical inertia means in the housing, the inertia means including a control member displaceable from a normal position in the housing to a second position in response to a skid condition evidenced by excessive angular deceleration of a wheel in relation to linear vehicle deceleration, vacuum control means including port means in the housing, said displaceable control member having port sealing surface means movable into and out of sealing cooperation with said vacuum port as it is displaced between said normal position and said skid position, said vacuum control means including means to regulate hydraulic pressure in a brake control line of the vehicle to reduce wheel braking force when said control member is in said second position, said control member being displaceable to a third position from said normal position and opposite from said second position in response to angular wheel acceleration, said port sealing surface means being movable in and out of sealing cooperation with said vacuum port means as it is displaced between said normal position and said third position, said pressure regulating means reducing wheel brakiNg force when said control member is in said third position whereby spin-up response of the wheel to synchronous speed is improved.

Claim 12

An anti-skid device for a wheeled vehicle comprising a substantially enclosed housing, mechanical inertia means to sense a non-proportional change in linear and angular deceleration of a vehicle wheel defining a skid condition, means for mounting the mechanical inertia means in the housing, the inertia means including a control member displaceable from a normal position in the housing to a second position in response to a skid condition evidenced by excessive angular deceleration of a wheel in relation to linear vehicle deceleration, vacuum control means including port means in the housing, said displaceable control member having port sealing surface means movable into and out of sealing cooperation with said vacuum port as it is displaced between said normal position and said skid position, said vacuum control means including means to regulate hydraulic pressure in a brake control line of the vehicle to reduce wheel braking force when said control member is in said second position, said control member being displaceable to a third position from said normal position and opposite from said second position in response to angular wheel acceleration, said port sealing surface means being movable in and out of sealing cooperation with said vacuum port means as it is displaced between said normal position and said third position, said pressure regulating means reducing wheel brakiNg force when said control member is in said third position whereby spin-up response of the wheel to synchronous speed is improved.