A spool for a hydraulic valve includes a cylindrical body having a first end, a second end disposed opposite the first end, and an annular wall defined by an internal surface of the cylindrical body and an external surface of the cylindrical body. The annular wall defines a plurality of holes theret
A spool for a hydraulic valve includes a cylindrical body having a first end, a second end disposed opposite the first end, and an annular wall defined by an internal surface of the cylindrical body and an external surface of the cylindrical body. The annular wall defines a plurality of holes therethrough. The internal surface defines a first chamber, a second chamber, and a slot chamber within the cylindrical body, the second chamber being in fluid communication with the plurality of holes via the first chamber, the slot chamber being located between the second chamber and the second end of the cylindrical body. The annular wall defines a slot therethrough, the slot extending from the second end of the cylindrical body toward the first end of the cylindrical body along the longitudinal direction, the slot being open at the second end of the cylindrical body along the longitudinal direction.
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1. A spool for a hydraulic valve, the spool comprising: a cylindrical body having a first end a second end disposed opposite the first end along a longitudinal direction, and an annular wall defined by an internal surface of the cylindrical body and an external surface of the cylindrical body,the an
1. A spool for a hydraulic valve, the spool comprising: a cylindrical body having a first end a second end disposed opposite the first end along a longitudinal direction, and an annular wall defined by an internal surface of the cylindrical body and an external surface of the cylindrical body,the annular wall defining a plurality of holes therethrough along a radial direction, the radial direction being perpendicular to the longitudinal direction,the internal surface defining a first chamber, a second chamber, and a slot chamber within the cylindrical body, the second chamber being in fluid communication with the plurality of holes via the first chamber, the slot chamber being located between the second chamber and the second end of the cylindrical body and being blocked from fluid communication with the second chamber by a plug disposed within the cylindrical body,the annular wall defining a slot therethrough, the slot extending from the second end of the cylindrical body toward the first end of the cylindrical body along the longitudinal direction, the slot being open at the second end of the cylindrical body along the longitudinal direction, an entirety of the slot being disposed between the plug and the second end of the cylindrical body along the longitudinal direction, the slot being in direct fluid communication with the slot chamber along the radial direction. 2. The spool of claim 1, wherein the slot is configured to engage with an anti-spin pin of a valve body of the hydraulic valve. 3. The spool of claim 1, wherein the plurality of holes includes a first set of holes and a second set of holes, the second set of holes being located between the first set of holes and the second end of the cylindrical body along the longitudinal direction, and wherein a perimeter of each hole of the first set of holes is less than a perimeter of each hole of the second set of holes. 4. The spool of claim 1, wherein the internal surface of the cylindrical body terminates at an end of the first chamber along the longitudinal direction, such that the spool has a solid cross section in a radial plane between the first chamber and the first end of the cylindrical body. 5. The spool of claim 1, wherein the first chamber is configured to elongate along the longitudinal direction based on a fluid pressure within the first chamber, wherein an outer surface of the first chamber is configured to contract based on the elongation of the first chamber, andwherein an inner diameter of the second chamber is less than an inner diameter of the first chamber. 6. A hydraulic valve comprising: a valve body defining at least one bore, at least one pump port, at least one tank port, a first flow passage in fluid communication with the at least one pump port and the at least one bore, and a second flow passage in fluid communication with the at least one tank port and the at least one bore;at least one spool slidably disposed within the at least one bore of the valve body, the at least one spool being configured to selectively fluidly communicate with the first flow passage and the second flow passage, the at least one spool comprising: a cylindrical body having a first end, a second end disposed opposite the first end along a longitudinal direction, and an annular wall defined by an internal surface of the cylindrical body and an external surface of the cylindrical body; andat least one biasing member disposed within the valve body, and coupled to the first end of the cylindrical body of the at least one spool,the annular wall defining a plurality of holes therethrough along a radial direction, the radial direction being perpendicular to the longitudinal direction,the internal surface defining a first chamber, a second chamber, and a slot chamber within the cylindrical body, the second chamber being in fluid communication with the plurality of holes via the first chamber, the slot chamber being located between the second chamber and the second end of the cylindrical body and being blocked from fluid communication with the second chamber by a plug disposed within the cylindrical body,the annular wall defining a slot therethrough, the slot extending from the second end of the cylindrical body toward the first end of the cylindrical body along the longitudinal direction, the slot being open at the second end of the cylindrical body along the longitudinal direction, an entirety of the slot being disposed between the plug and the second end of the cylindrical body along the longitudinal direction, the slot being in direct fluid communication with the slot chamber along the radial direction. 7. The hydraulic valve of claim 6 further comprising an anti-spin pin engaged with the slot of the at least one spool and the valve body to limit rotational motion of the at least one spool relative to the valve body. 8. The hydraulic valve of claim 6, wherein the plurality of holes comprises a first set of holes and a second set of holes, the second set of holes being located between the first set of holes and the second end of the cylindrical body along the longitudinal direction, and wherein a perimeter of each hole of the first set of holes is less than a perimeter of each hole of the second set of holes. 9. The hydraulic valve of claim 8, wherein the internal surface of the cylindrical body terminates at an end of the first chamber along the longitudinal direction, such that the spool has a solid cross section in a radial plane between the first chamber and the first end of the cylindrical body. 10. The hydraulic valve of claim 6, further comprising a solenoid coupled to the second end of the cylindrical body of the at least one spool. 11. The hydraulic valve of claim 6, wherein the first chamber is configured to elongate along the longitudinal direction based on a fluid pressure within the first chamber, wherein an outer surface of the first chamber is configured to contract based on the elongation of the first chamber, and wherein an inner diameter of the second chamber is less than an inner diameter of the first chamber. 12. A hydraulic system comprising: a pump;a tank; anda hydraulic valve in fluid communication with the pump and the tank, the hydraulic valve comprising:a valve body defining at least one bore, a first flow passage configured to communicate with the pump via at least one pump port, and a second flow passage configured to communicate with the tank via at least one tank port;at least one spool slidably disposed within the at least one bore of the valve body, and configured to selectively communicate with first flow passage and the second flow passage, the at least one spool comprising: a cylindrical body having a first end, a second end disposed opposite the first end along a longitudinal direction, and an annular wall defined by an internal surface of the cylindrical body and an external surface of the cylindrical body; andat least one biasing member disposed within the valve body, and coupled to the first end of the cylindrical body of the at least one spool,the annular wall defining a plurality of holes therethrough along a radial direction, the radial direction being perpendicular to the longitudinal direction,the internal surface defining a first chamber, a second chamber, and a slot chamber within the cylindrical body, the second chamber being in fluid communication with the plurality of holes via the first chamber, the slot chamber being located between the second chamber and the second end of the cylindrical body and being blocked from fluid communication with the second chamber by a plug disposed within the cylindrical body,the annular wall defining a slot therethrough, the slot extending from the second end of the cylindrical body toward the first end of the cylindrical body along the longitudinal direction, the slot being open at the second end of the cylindrical body along the longitudinal direction, an entirety of the slot being disposed between the plug and the second end of the cylindrical body along the longitudinal direction, the slot being in direct fluid communication with the slot chamber along the radial direction. 13. The hydraulic system of claim 12, wherein the hydraulic valve further comprises an anti-spin pin engaged with the slot of the at least one spool and the valve body to limit rotational motion of the at least one spool relative to the valve body. 14. The hydraulic system of claim 12, further comprising a solenoid coupled to the second end of the cylindrical body of the at least one spool. 15. The hydraulic system of claim 12, wherein the first chamber is configured to elongate along the longitudinal direction based on a fluid pressure within the first chamber, wherein an outer surface of the first chamber is configured to contract based on the elongation of the first chamber, andwherein an inner diameter of the second chamber is less than an inner diameter of the first chamber.
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이 특허에 인용된 특허 (13)
Ballard, Peter M.; Bostiga, Richard H., Bypass directional control valve.
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