Separating valve for an antiskid brake system

Claim 2

A pressure actuated separating valve for an antiskid brake system, said separating valve interrupting and reestablishing a pressure medium connection between a brake actuating means and at least one wheel brake cylinder in response to movement of a plunger unit whose movement is responsive to antiskid control signals, comprising: a valve casing having a first longitudinal bore coaxial of a longitudinal axis; a first valve closing element disposed concentric of said first bore to control a free pressure medium flow from said brake actuating means to said wheel brake cylinder; a second valve closing element disposed within and concentric of said first valve closing element to control a throttled pressure medium flow from said brake actuating means to said wheel brake cylinder; a first spring means disposed coaxial of said axis in a cooperative operating association with said first valve closing element; a second spring means disposed coaxial of said axis in a cooperative operating association with said second valve closing element; and a ram means disposed coaxial of said axis operable by said plunger unit, said ram being in a cooperative operating association with said second valve closing element; said first and second spring means and said ram means being in a cooperative operating association with each other to cause said first valve closing element to be actuated in its opening direction only after said second valve closing element has been actuated in its opening direction.

Claim 3

A separating valve according to claim 1, wherein said first and second springs and said ram are in a cooperative operating association with each other such that said second valve closing element and said first valve closing element are mechanically actuated one after the other in their opening direction and both said first and second valve closing elements are actuated together hydraulically in their closing direction.

Claim 4

A separating valve according to claim 2, wherein said second valve closing element has a ball shape.

Claim 5

A separating valve according to claim 3, further including a radial inwardly extending first step disposed in the inner surface of said first bore to provide a first valve seat for said first valve closing element; a second longitudinal bore coaxial of said axis disposed in said first valve closing element, said second bore having a first portion with a given diameter adjacent said first valve seat and a second portion with a first diameter greater than said given diameter spaced from said first valve seat, adjacent ends of said first and second portions being interconnected by a second step in the inner surface of said second bore, the end of said second portion remote from said second step providing a second valve seat for said second valve closing element; and said ram projects through said first portion into said second portion to actuate said second valve closing element.

Claim 6

A separating valve according to claim 4, further including a first spring to prestress said second valve closing element in its closing direction.

Claim 7

A pressure actuated separating valve for an antiskid brake system, said separating valve interrupting and reestablishing a pressure medium connection between a brake actuating means and at least one wheel brake cylinder in response to movement of a plunger unit whose movement is responsive to antiskid control signals, comprising: a valve casing having a first longitudinal bore coaxial of a longitudinal axis; a first valve closing element disposed concentric of said first fore to control a free pressure medium flow from said brake actuating means to said wheel brake cylinder; a second valve closing element disposed within and concentric of said first valve closing element to control a throttled pressure medium flow from said brake actuating means to said wheel brake cylinder; said first valve closing element being actuated in its opening dIrection only after said second valve closing element has been actuated in its opening direction and both said first and second valve closing elements being actuated together hydraulically in their closing direction; said second valve closing element having a ball shape; a radial inwardly extending first step disposed in the inner surface of said first bore to provide a first valve seat for said first valve closing element; a second longitudinal bore coaxial of said axis disposed in said first valve closing element, said second bore having a first portion with a given diameter adjacent said first valve seat and a second portion with a first diameter greater than said given diameter spaced from said first valve seat, adjacent ends of said first and second portions being interconnected by a second step in the inner surface of said second bore, the end of said second portion remote from said second step providing a second valve seat for said second valve closing element; a ram operable by said plunger unit projecting through said first portion into said second portion to actuate said second valve closing element; a first spring to prestress said second valve closing element in its closing direction; a collar disposed on the end of said ram adjacent said plunger unit; and a second spring disposed coaxial of said ram extending between said collar and the end of said first valve closing element surrounding said first portion adjacent said first valve seat to prestress said first valve closing element in its opening direction.

Claim 8

A pressure actuated separating valve for an antiskid brake system, said separating valve interrupting and reestablishing a pressure medium connection between a brake actuating means and at least one wheel brake cylinder in response to movement of a plunger unit whose movement is responsive to antiskid control signals, comprising: a valve casing having a first longitudinal bore coaxial of a longitudinal axis; a first valve closing element disposed concentric of said first fore to control a free pressure medium flow from said brake actuating means to said wheel brake cylinder; a second valve closing element disposed within and concentric of said first valve closing element to control a throttled pressure medium flow from said brake actuating means to said wheel brake cylinder; said first valve closing element being actuated in its opening dIrection only after said second valve closing element has been actuated in its opening direction and both said first and second valve closing elements being actuated together hydraulically in their closing direction; said second valve closing element having a ball shape; a radial inwardly extending first step disposed in the inner surface of said first bore to provide a first valve seat for said first valve closing element; a second longitudinal bore coaxial of said axis disposed in said first valve closing element, said second bore having a first portion with a given diameter adjacent said first valve seat and a second portion with a first diameter greater than said given diameter spaced from said first valve seat, adjacent ends of said first and second portions being interconnected by a second step in the inner surface of said second bore, the end of said second portion remote from said second step providing a second valve seat for said second valve closing element; a ram operable by said plunger unit projecting through said first portion into said second portion to actuate said second valve closing element; a first spring to prestress said second valve closing element in its closing direction; a collar disposed on the end of said ram adjacent said plunger unit; and a second spring disposed coaxial of said ram extending between said collar and the end of said first valve closing element surrounding said first portion adjacent said first valve seat to prestress said first valve closing element in its opening direction.

Claim 9

A separating valve according to claim 6, wherein said first valve closing element includes a pressure actuating surface disposed transversely of said axis adjacent said second valve seat; and the value of the tension of said second spring is greater than the force of the maximum brake pressure applied from said braking actuating means to said pressure actuating surface when said first valve closing element is in its opened position.

Claim 10

A separating valve according to claim 7, further including a cap having pressure medium openings therein, said cap being disposed to encircle both said first and second valve closing elements and having a radial outwardly extending third step disposed in the outer surface thereof; and a stop ring disposed transversely of said first bore adjacent the end thereof remote from said ram; and wherein said first spring is supported between said stop ring and said third step to prestress both said first and second valve closing elements in their closing direction.

Claim 11

A pressure actuated separating valve for an antiskid brake system, said separating valve interrupting and reestablishing a pressure medium connection between a brake actuating means and at least one wheel brake cylinder in response to movement of a plunger unit whose movement is responsive to antiskid control signals, comprising: a valve casing having a first longitudinal bore coaxial of a longitudinal axis; a first valve closing element disposed concentric of said first bore to control a free pressure medium flow from said brake actuating means to said wheel brake cylinder; a second valve closing element disposed within and concentric of said first valve closing element to control a throttled pressure medium flow from said brake actuating means to said wheel brake cylinder; said first valve closing element being actuated in its opening direction only after said second valve closing element has been actuated in its opening direction and both said first and second valve closing elements being actuated together hydraulically in their closing direction; said second valve closing element having a ball shape; a radial inwardly extending first step disposed in the inner surface of said first bore to provide a first valve seat for said first valve closing element; a second longitudinal bore coaxial of said axis disposed in said first valve closing element, said second bOre having a first portion with a given diameter adjacent said first valve seat and a second portion with a first diameter greater than said given diameter spaced from said first valve seat, adjacent ends of said first and second portions being interconnected by a second step in the inner surface of said second bore, the end of said second portion remote from said second step providing a second valve seat for said second valve closing element; a ram operable by said plunger unit projecting through said first portion into said second portion to actuate said second valve closing element; said first valve closing element including a first section having a hemispherical shape for cooperation with said first valve seat to control the free pressure medium flow from said brake actuating means to said wheel brake cylinder, a second section in the form of a hollow cylinder, said second section being interconnected to said first section by a radial inwardly extending third step in the outer surface of said first valve closing element, and said first and second sections include said second bore, said second portion of said second bore further includes in said second section a third portion having a second diameter greater than said first diameter, adjacent ends of said second and third portions being interconnected by a fourth step, said fourth step providing said second valve seat.

Claim 12

A pressure actuated separating valve for an antiskid brake system, said separating valve interrupting and reestablishing a pressure medium connection between a brake actuating means and at least one wheel brake cylinder in response to movement of a plunger unit whose movement is responsive to antiskid control signals, comprising: a valve casing having a first longitudinal bore coaxial of a longitudinal axis; a first valve closing element disposed concentric of said first bore to control a free pressure medium flow from said brake actuating means to said wheel brake cylinder; a second valve closing element disposed within and concentric of said first valve closing element to control a throttled pressure medium flow from said brake actuating means to said wheel brake cylinder; said first valve closing element being actuated in its opening direction only after said second valve closing element has been actuated in its opening direction and both said first and second valve closing elements being actuated together hydraulically in their closing direction; said second valve closing element having a ball shape; a radial inwardly extending first step disposed in the inner surface of said first bore to provide a first valve seat for said first valve closing element; a second longitudinal bore coaxial of said axis disposed in said first valve closing element, said second bOre having a first portion with a given diameter adjacent said first valve seat and a second portion with a first diameter greater than said given diameter spaced from said first valve seat, adjacent ends of said first and second portions being interconnected by a second step in the inner surface of said second bore, the end of said second portion remote from said second step providing a second valve seat for said second valve closing element; a ram operable by said plunger unit projecting through said first portion into said second portion to actuate said second valve closing element; said first valve closing element including a first section having a hemispherical shape for cooperation with said first valve seat to control the free pressure medium flow from said brake actuating means to said wheel brake cylinder, a second section in the form of a hollow cylinder, said second section being interconnected to said first section by a radial inwardly extending third step in the outer surface of said first valve closing element, and said first and second sections include said second bore, said second portion of said second bore further includes in said second section a third portion having a second diameter greater than said first diameter, adjacent ends of said second and third portions being interconnected by a fourth step, said fourth step providing said second valve seat.

Claim 13

A separating valve according to claim 9, further including a bottom wall for said second section spaced from said fourth step and transverse to said axis; first compensating bores disposed in said bottom wall; a pot-shaped part having its outer cylindrical wall disposed in sliding relation with the inner surface of said second section and its bottom in contact with said second valve closing element; second compensating bores disposed in said bottom of said pot-shaped part; and a first spring disposed within said pot-shaped part between said bottom wall and said bottom of said pot-shaped part to prestress said second valve closing element in its closing direction.

Claim 14

A separating valve according to claim 10, further including a radial inwardly extending first collar for said valve casing adjacent said second section; a jacket having a cylindrical portion, the outer surface of said cylindrical portion being in a sliding relation with the inner surface of said first bore adjacent said first collar, a radial inwardly extending second collar engaging said third step, and a bevelled portion interconnecting said cylindrical portion and said second collar; third compensating bores disposed in said bevelled portion; and a second spring disposed concentric with the outer surface of said second section supported between said first and second collars to prestress said first valve closing element in its closing direction.

Claim 15

A separating valve according to claim 11, wherein said first spring is considerably stronger than said second spring.