Braking apparatus

Claim 2

A braking system for a vehicle wheel, comprising; a. brake operating means; b. a reservoir for liquids; c. a pump having drive means which increases the pump throughput with increased wheel rotational speed; d. means to connect the pump input with the reservoir; e. a conduit connecting the pump output with the reservoir; f. a connection between the conduit and the brake operating means; g. brake applying means located downstream of the connection, and operable to add a restriction into the conduit so that the liquid pressure in the connection is increased; h. a leakage conduit arranged to bypass the brake applying means, which leakage conduit incorporates a variable restriction to provide a variable restriction to liquid flow and a fixed restriction in series with the variable restriction; and i. means to vary the variable restriction automatically with increased wheel rotational speed.

Claim 3

A braking system as claimed in claim 1 in which there is means to sense the throughput of the pump, which sensing means controls the means to vary the variable restriction.

Claim 4

A braking system as claimed in claim 2 in which the means to sense the throughput of the pump consists of a further restriction in the conduit upstream of the connection, and the varying means comprises a shuttle mounted in a cylinder and having two sides, each side being connected through further conduits to the pressure at the two sides respectively of the further restriction.

Claim 5

A braking system as claimed in claim 3 in which the shuttle is arranged in the leakage conduit, the shuttle in combination with its cylinder providing the variable restriction.

Claim 6

A braking system as claimed in claim 3 in which there is provided damping means arranged so that the variation of the variable restriction lags the variation of the vehicle wheel speed, which damping means comprises a damping restriction arranged in the further conduit between one side of the shuttle and the high pressure side of the further restriction, so that movement of the shuttle and hence the variation of the variable restriction lags the variation of the vehicle wheel speed.

Claim 7

A braking system as claimed in claim 1 in which the brake applying means comprise; a. a second liquid pump; b. a brake actuating member connected to the second pump so that movement of the member produces an output from the second pump; c. a control valve having a valve member progressively movable between two positions; d. a conduit connecting the output of the second pump to the control valve so that an output from the second pump moves the valve member; e. a first conduit through the control valve which first conduit connects the output of the second pump to the brake operating means when the valve member is in the first position; and f. means on the valve member to progressively restrict the conduit from the first-mentioned pump downstream of the connection as the valve member is moved progressively from its first position towards its second position.

Claim 8

A braking system for a vehicle wheel, comprising: a. brake operating means; b. a reservoir for liquids; c. a pump having drive means which increases the pump throughput with increased wheel rotational speed; d. means to connect the pump input with the reservoir; e. a conduit connecting the pump output with the reservoir; f. a connection between the conduit and the brake operating means; g. brake applying means located downstream of the connection, and operable to add a restriction into the conduit so that the liquid pressure in the connection is increased; h. a leakage conduit arranged to bypass the brake applying means, which leakage conduit incorporates a variable restriction to provide a variable restriction to liquid flow; i. means to vary the variable restriction automatically with increased wheel rotational speed; and j. damping means arranged so that the variation of the variable restriction lags the variation of the vehicle wheel speed.

Claim 9

A braking system for a vehicle wheel, comprising: a. brake operating means; b. a reservoir for liquids; c. a pump having drive means which increases the pump throughput with increased wheel rotational speed; d. means to connect the pump input with the reservoir; e. a conduit connecting the pump output with the reservoir; f. a connection between the conduit and the brake operating means; g. brake applying means located downstream of the connection, and operable to add a restriction into the conduit so that the liquid pressure in the connection is increased; h. a leakage conduit arranged to bypass the brake applying means, which leakage conduit incorporates a variable restriction to provide a variable restriction to liquid flow; i. means to vary the variable restriction automatically with increased wheel rotational speed; and j. damping means arranged so that the variation of the variable restriction lags the variation of the vehicle wheel speed.