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US 2016/0290516 A1Published application
Valve having improved spool geometry
AssigneeCaterpillar Inc.
InventorsMatthew J. BESCHORNER, Bryan A. JOHNSON, Hideki NAKAJIMA
Life of this patent
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Abstract
A spool is disclosed for use in a valve. The spool may have an elongated cylindrical body with a first end and a second end. The spool may also have a first land formed at the first end, a second land axially spaced apart from the first land, and a check element located between the first and second lands. The check element may have an outer diameter that is about 0.5-1% greater than an outer diameter of the second land.
Claims20
A spool for a valve, comprising:
- an elongated cylindrical body having a first end and a second end;
- a first land formed at the first end;
- a second land axially spaced apart from the first land;
- and
- a check element located between the first and second lands, and having an outer diameter that is about 0.5-1% greater than an outer diameter of the second land.
2 more elements
A valve, comprising:
- a valve body having:
- a bore with a first end and a second end;
- a first passage formed adjacent the first end in communication with the bore;
- and
- a second passage formed adjacent the second end in communication with the bore;
- and
- a spool reciprocatingly disposed within the bore of the valve body and having:
- an elongated cylindrical spool body having a first end disposed within the first end of the bore, and a second end disposed within the second end of the bore;
- a first land formed at the first end of the elongated cylindrical spool body;
- an annular seal disposed between an outer surface of the first land and an inner surface of the bore;
- a second land axially spaced apart from the first land;
- a check element located between the first and second lands and configured to selectively inhibit fluid communication between the first and second passages, the check element having an outer diameter that is about 0.5-1% greater than an outer diameter of the second land and about equal to an outer diameter of the first land;
- and
- a third land formed at the second end of the elongated cylindrical spool body.
11 more elements
A hydraulic circuit, comprising:
- an actuator;
- a pump;
- a sump;
- and
- a valve disposed between the actuator, the pump, and the sump, the valve including:
- a valve body having:
- a bore with a first end and a second end;
- a first passage formed adjacent the first end in communication with the bore and in communication with the actuator;
- a second passage formed adjacent the second end in communication with the bore and in communication with one of the pump and the sump;
- a tapered seat located between the first and second passages;
- and
- a spool reciprocatingly disposed within the bore of the valve body, the spool having:
- an elongated cylindrical spool body having a first end disposed within the first end of the bore, and a second end disposed within the second end of the bore;
- a first land formed at the first end of the elongated cylindrical spool body;
- an annular seal disposed between an outer surface of the first land and an inner surface of the bore;
- a second land axially spaced apart from the first land;
- a frustoconical check element located between the first and second lands and configured to selectively engage the tapered seat and inhibit fluid communication between the first and second passages, the frustoconical check element having an outer diameter that is about 0.7-0.8% greater than an outer diameter of the second land and about equal to an outer diameter of the first land;
- and
- a third land formed at the second end of the elongated cylindrical spool body;
- and
- an electro-hydraulic actuator mounted to the valve body at the first end and connected to the spool, the electro-hydraulic actuator operable to move the frustoconical check element away from the tapered seat.
18 more elements
Dependencies are inferred from the claim text.