HYDRAULIC CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

• Main Authors: MAKINO KOJI, KOJIMA KAZUTERU, HYODO YOSHIMITSU, TSUCHIDA KENICHI, KUTSUBO HIROYUKI
• Format: Patent
• Language: English; Japanese
• Published: 17.11.2016
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a hydraulic control device for an automatic transmission capable of alleviating a shock when switching from a running range to a non-running range, without providing an accumulator.SOLUTION: A hydraulic control device for an automatic transmission includes: a range switching device 21; a solenoid valve SL5 which can engage a first brake B1 by supplying a running range pressure while adjusting the running range pressure to a hydraulic servo 22 of the first brake B1 in a running range; a solenoid valve SLU which outputs a hydraulic pressure at least in a non-running range and which can supply the hydraulic pressure to the solenoid valve SL5 in the non-running range; and a fail-safe valve 70 which, in the case where an engagement pressure of the first brake B1 and an engagement pressure of a second brake B2 are inputted, switches from a normal position capable of supplying the engagement pressure of the second brake B2 to a cutoff position for cutting off the supply of the engagement pressure of the second brake B2.SELECTED DRAWING: Figure 3 【課題】アキュムレータを設けることなく、走行レンジから非走行レンジに切り換えられた際のショックを軽減できる自動変速機の油圧制御装置を提供する。【解決手段】レンジ切換え装置２１と、走行レンジにおいて第１ブレーキＢ１の油圧サーボ２２に走行レンジ圧を調圧しつつ供給して第１ブレーキＢ１を係合可能なソレノイドバルブＳＬ５と、非走行レンジにおいて少なくとも非走行レンジで油圧を出力し、この油圧をソレノイドバルブＳＬ５に供給可能なソレノイドバルブＳＬＵと、第１ブレーキＢ１の係合圧及び第２ブレーキＢ２の係合圧が入力される場合に、第２ブレーキＢ２の係合圧を供給可能な正常位置から第２ブレーキＢ２の係合圧の供給を遮断する遮断位置に切り換わるフェールセーフバルブ７０と、を備える。【選択図】図３