Reaction mechanism of a hydraulic control valve

Claim 2

A reaction mechanism which comprises: at least one pump; a control valve for regulating hydraulic pressure by controlling hydraulic fluid disgorged from said pump; an input member mechanically connected to said control valve and operated by a driver, said input member having a smaller diameter portion and a larger diameter portion, the larger diameter portion being located closest to the driver; an annular reaction regulating member in which said smaller diameter portion of said input member is slidably inserted; biasing means for normally urging said annular member toward said larger portion of said input member; and means for supplying said hydraulic pressure regulated by said control valve into an area between said annular member and said larger diameter portion of said input member to displace said annular member in a direction away from said larger diameter portion of said input member and in the same direction as the displacement of the input member against said biasing means; whereby the displacement of said annular member reduces the reaction of said input member to variations of said hydraulic pressure when said hydraulic pressure is below a predetermined value.

Claim 3

The reaction mechanism of claim 1, wherein said means for supplying hydraulic pressure comprises: connecting means for conveying fluid from said control valve to said area between said annular member and said larger diameter portion of said input member; a first spool located adjacent said annular member and including an annular groove; and a flow restriction member selectively connecting a passage member communicating with said hydraulic pressure and said first spool annular groove for regulating said hydraulic pressure in said area between said annular member and said larger diameter portion of said input member.

Claim 4

The reaction mechanism of claim 2, wherein: said biasing means is displaced between said annular member and said flow restriction member.

Claim 5

The reaction mechanism of claim 1, wherein said control valve comprises: a housing including an inlet connected to said pump; and a second spool connecting said inlet and forming a first and a second chamber wherein said first chamber is operatively associated with said inlet and said second chamber is operatively associated with said means for supplying said hydraulic pressure.

Claim 6

The reaction mechanism of claim 4, which further comprises: a one-way check valve displaced between said second spool and said means for supplying said hydraulic pressure.

Claim 7

The reaction mechanism of claim 5, which further comprises: said housing including an outlet adjacent said inlet; and a variable restriction member, operatively associated with said second spool, selectively connecting said inlet to said outlet in response to said operation of said input member.

Claim 8

The reaction mechanism of claim 1, which further comprises: a check valve assembly including; a housing provided with an inlet, operatively associated with said pump, and a horizontal passage; a second spool having a groove formed thereon interconnecting said inlet and said horizontal passage; second fluid flow means operatively associated with said area between said annular member and said larger diameter portion of said input member in response to said operation of said input member.

Claim 9

The reaction mechanism of claim 7, said check valve assembly further comprises: a one-way check valve interconnecting said housing horizontal passage with said second fluid flow means.

Claim 10

A reaction mechanism which comprises: at least one pump; a control valve for regulating hydraulic pressure by controlling hydraulic fluid disgorged from said pump; an input member mechanically connected to said control valve and operated by a driver, said input member having a smaller diameter portion and a larger diameter portion the larger diameter portion being located closest to the driver; an annular reaction regulating member in which said smaller diameter portion of said input member is slidably inserted; a first spool located adjacent said annular member; first biasing means for normally urging said annular member toward said larger portion of said input member; second biasing means for normally urging said first spool to said input member; and means for supplying said hydraulic pressure regulated by said control valve into an area between said annular member and said larger diameter portion of said input member to displace said annular member in a direction away from said larger diameter portion of said input member and in the same direction as the displacement of the input member against said biasing means; whereby the displacement of said annular member reduces the reaction of said input member to variations of said hydraulic pressure when said hydraulic pressure is below a predetermined value.

Claim 11

A reaction mechanism which comprises: at least one pump; a control valve for regulating hydraulic pressure by controlling hydraulic fluid disgorged from said pump; an input member mechanically connected to said control valve and operated by a driver, said input member having a smaller diameter portion and a larger diameter portion the larger diameter portion being located closest to the driver; an annular reaction regulating member in which said smaller diameter portion of said input member is slidably inserted; a first spool located adjacent said annular member; first biasing means for normally urging said annular member toward said larger portion of said input member; second biasing means for normally urging said first spool to said input member; and means for supplying said hydraulic pressure regulated by said control valve into an area between said annular member and said larger diameter portion of said input member to displace said annular member in a direction away from said larger diameter portion of said input member and in the same direction as the displacement of the input member against said biasing means; whereby the displacement of said annular member reduces the reaction of said input member to variations of said hydraulic pressure when said hydraulic pressure is below a predetermined value.

Claim 12

The reaction mechanism of claim 9, wherein said means for supplying hydraulic pressure comprises: connecting means for conveying fluid from said control valve to said area between said annular member and said diameter portion of said input member; said first spool located adjacent said annular member including an annular groove; and a flow restriction member selectively connecting a passage member communicating with said hydraulic pressure and said first spool annular groove regulating said hydraulic pressure in said area between said annular member and said larger diameter portion of said input member.

Claim 13

The reaction mechanism of claim 10, wherein: said first biasing means is displaced between said annular member and said flow restriction member.

Claim 14

The reaction mechanism of claim 9, wherein said control valve comprises: a housing including an inlet connected to said pump; and a second spool connecting said inlet and forming a first and a second chamber wherein said first chamber is operatively associated with said inlet and said second chamber is operatively associated with said means for supplying said hydraulic pressure.

Claim 15

The reaction mechanism of claim 12, which further comprises: a one-way check valve displaced between said second spool and said means for supplying said hydraulic pressure.

Claim 16

The reaction mechanism of claim 13, which further comprises: said housing including an outlet adjacent said inlet; and a variable restriction member, operatively associated with said second spool selectively connecting said means for supplying said hydraulic pressure.

Claim 17

The reaction mechanism of claim 9, which further comprises a check valve assembly including; a housing provided with an inlet, operatively associated with said pump, and a horizontal passage; a second spool having a groove formed thereon interconnecting said inlet and said horizontal passage; second fluid flow means operatively associated with said area between said annular member and said larger diameter portion of said input member in response to said operation of said input member.

Claim 18

The reaction mechanism of claim 15, said check valve assembly further comprises: a one-way check valve interconnecting said housing horizontal passage with said second fluid flow means.