AUTOMATIC TRANSMISSION

• Main Authors: KATAKURA SHUSAKU, SHIMIZU YUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 25.05.2017
• 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 prevent a release shock of a low brake at a change of a range to an N-range from a D-range, and to make a delay of fastening/release timing not occur at switching between a first gear and a second gear at the D-range.SOLUTION: An accumulator control valve 60 is arranged between an accumulation connecting oil passage P6 connected to a control pressure oil passage P4 which connects a low-brake electromagnetic valve 44 and a low brake L/B and an accumulator 47. The accumulator control valve blocks the accumulator connecting oil passage P6 when hydraulic pressure is supplied to a D-range oil passage P2 from a manual valve 41, and connects an accumulator supply oil passage P7 which is branched from the D-range oil passage P2 to the accumulator. Since the control pressure oil passage P4 communicates with the accumulator in the N-range, a release shock of a low brake L/B is prevented, the accumulator does not function with respect to the low brake L/B due its blocking at switching between a first gear and a second gear, and a delay of fastening/release timing does not occur.SELECTED DRAWING: Figure 3 【課題】ＤからＮレンジへの変更時にはローブレーキの解放ショックを防止するとともにＤレンジでの１速・２速間切換時には締結・解放タイミングの遅れを生じさせない。【解決手段】ローブレーキ用電磁弁４４とローブレーキＬ／Ｂを接続する制御圧油路Ｐ４につながるアキュムレータ接続用油路Ｐ６とアキュムレータ４７との間にアキュムレータ制御弁６０を設ける。アキュムレータ制御弁はＤレンジ用油路Ｐ２にマニュアルバルブ４１から油圧が供給されると、アキュムレータ接続用油路Ｐ６を遮断してＤレンジ用油路Ｐ２から分岐したアキュムレータ供給油路Ｐ７をアキュムレータに接続する。Ｎレンジでは制御圧油路Ｐ４がアキュムレータと連通するのでローブレーキＬ／Ｂの解放ショックが防止され、１速・２速間切換時にはアキュムレータが遮断によりローブレーキＬ／Ｂに対して機能せず締結・解放タイミングの遅れが生じない。【選択図】図３