A hydraulic transmission unit comprises at least one pressure regulation valve (1) and a pilot control valve (2) which is connected to the pressure regulation valve (1) by a pilot control line (35). A pre-filling valve (3, 303) sets a pre-filling pressure (p—3) to avoid draining of a clutch (20) and
A hydraulic transmission unit comprises at least one pressure regulation valve (1) and a pilot control valve (2) which is connected to the pressure regulation valve (1) by a pilot control line (35). A pre-filling valve (3, 303) sets a pre-filling pressure (p—3) to avoid draining of a clutch (20) and the lines (231, 331) connected to the clutch (20) in an operating condition in which the clutch (20) is not actuated. To avoid draining when the clutch when in the operating condition, the pilot control line (35) is also connected to at least one line (236, 238, 336, 338) which is pressurized with a second pre-filling pressure (p—3).
대표청구항▼
1. A hydraulic transmission control unit comprising: at least one pressure regulation valve (1) and at least one pilot control valve (2) which is connected, via a pilot control line (35), to the at least one pressure regulation valve (1);a pre-filling valve (3, 303) for adjusting a first pre-filling
1. A hydraulic transmission control unit comprising: at least one pressure regulation valve (1) and at least one pilot control valve (2) which is connected, via a pilot control line (35), to the at least one pressure regulation valve (1);a pre-filling valve (3, 303) for adjusting a first pre-filling pressure (p_3) to prevent draining of a clutch (20) and pressure lines (231, 331) connected to the pre-filling valve (3, 303) when the clutch (20) is not-actuated; andthe pilot control line (35) being connected to at least one other line (236′, 238, 336, 338) which is under a second pre-filling pressure (p_3′) such that draining of the pilot control line (35), when the clutch (20) is not actuated, is prevented. 2. The hydraulic transmission control unit according to claim 1, wherein the first pre-filling pressure (p_3) is greater than the second pre-filling pressure (p_3′). 3. The hydraulic transmission control unit according to claim 1, wherein the first pre-filling pressure (p_3) and the second pre-filling pressure (p_3′) are substantially equal to one another. 4. The hydraulic transmission control unit according to claim 1, wherein a second pre-filling valve (205) sets the second pre-filling pressure (p_3′). 5. The hydraulic transmission control unit according to claim 3, wherein a common pre-filling valve (303) sets the first pre-filling pressure (p_3) and the second pre-filling pressure (p_3′). 6. The hydraulic transmission control unit according to claim 1, wherein the first pre-filling pressure (p_3) and the second pre-filling pressure (p_3) are less than a clutch pressure (p_2) for actuating the clutch (20) and greater than an ambient pressure (p_0). 7. The hydraulic transmission control unit according to claim 1, wherein the pre-filling valve (3, 205, 303) is a pressure-limiting valve and is designed as a seat valve. 8. The hydraulic transmission control unit according to claim 7, wherein the pre-filling valve, designed as the seat valve, is a plate valve. 9. The hydraulic transmission control unit according to claim 1, wherein the pre-filling valve (3, 205, 303) is a pressure-reducing valve and is designed as a slide valve. 10. The hydraulic transmission control unit according to claim 2, wherein a hydraulic supply system supplies a first pressure line (231) and a second pressure line (236) with an operating medium, the first pressure line (231) and the second pressure line (236) are pressurized with the first pre-filling pressure (p_3) and are connected, via a constriction (281), to a third pressure line (238) and a fourth pressure line (236′) which are pressurized with the second pre-filling pressure (p_3′), and the constriction (281) is a hydraulic resistance. 11. The hydraulic transmission control unit according to claim 4, wherein a first pressure line (231, 331), which pre-fills the pressure regulation valve (1) and the clutch (20), and a third pressure line (238, 338), which pre-fills the pilot control valve (2) and the pilot control line (35), are connected to a hydraulic supply system independently of one another. 12. The hydraulic transmission control unit according to claim 1, wherein a plurality of pilot control valves (2) are arranged in the hydraulic transmission control unit, the plurality of pilot control valves (2) are connected to a common pre-filling line such that the second pre-filling pressure (p_3′) in the common pre-filling line is adjustable by a common pre-filling valve (205, 303) for all the plurality of pilot control valves (2). 13. The hydraulic transmission control unit according to claim 1, wherein a plurality of pilot control valves (2) are arranged in the hydraulic transmission control unit, and one pre-filling valve (205, 303) is associated with each of the plurality of pilot control valves (2). 14. A hydraulic transmission control unit in combination with a transmission for a motor vehicle, the transmission control unit comprising: at least one pressure regulation valve (1) and at least one pilot control valve (2) which is connected, via a pilot control line (35), to the at least one pressure regulation valve (1);a pre-filling valve (3, 303) for adjusting a first pre-filling pressure (p_3) to prevent draining of a clutch (20) and pressure lines (231, 331) connected to the pre-filling valve (3, 303) when the clutch (20) is not-actuated; andthe pilot control line (35) being connected to at least one other line (236′, 238, 336, 338) which is under a second pre-filling pressure (p_3′) such that draining of the pilot control line (35) when the clutch (20) is not actuated is prevented.
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이 특허에 인용된 특허 (5)
Schmidt, Thilo; Gierer, Georg; Steinhauser, Klaus, Device for control of a hydraulically actuatable shifting element.
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