REVERSE LOAD PREVENTION MECHANISM OF TRANSMISSION FOR VEHICLE

• Main Author: WATANABE YASUTOSHI
• Format: Patent
• Language: English; Japanese
• Published: 09.02.2017
• Subjects: BLASTING; BRAKES; CLUTCHES; COUPLINGS FOR TRANSMITTING ROTATION; ENGINEERING ELEMENTS AND UNITS; 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 avoid that reverse load torque generated by an abrupt reverse drive force from a wheel side is applied on a power transmission path when a vehicle is abruptly decelerated by an engine brake.SOLUTION: A low brake L/B which fastens a sun gear 27 to a fixed side at a forward first speed has: an outer hub 75 in which an external peripheral hub part of the sun gear is engaged with a friction plate 43, and has a plurality of cam teeth; and an inner hub 70 which is overlapped on the inside of the outer hub, engaged with the cam teeth of the outer hub, and has cam teeth. Both of the cam teeth have parallel faces which are parallel with a rotating shaft which abuts on the teeth at the input of thrust torque from an engine, and inclined faces which abut on the teeth at the input of reverse load torque from a wheel side. When the reverse load torque is inputted, the outer hub 75 is displaced along the inclined faces of the cam teeth, pushes balls 66 by a push pin 59 of a spring retainer 57, controls the hydraulic pressure of a first piston 60, alleviates a fastening degree of the low brake L/B, and blocks the reverse load torque.SELECTED DRAWING: Figure 8 【課題】エンジンブレーキにより車両を急減速させた場合に、ホイール側からの急激な逆駆動力による逆負荷トルク動力伝達経路にかからないようにする。【解決手段】前進１速でサンギア２７を固定側に締結するローブレーキＬ／Ｂにおいて、サンギアの外周ハブ部が摩擦プレート４３と噛み合うとともに複数のカム歯を備えるアウタハブ７５と、その内側に重なりアウタハブのカム歯と係合するカム歯を備えるインナハブ７０を有する。両カム歯はエンジンからの推進トルク入力時に当接する回転軸に平行な平行面とホイール側からの逆負荷トルク入力時に当接する傾斜面を備える。逆負荷トルクが入力するとアウタハブ７５がカム歯の傾斜面に沿って変位し、スプリングリテーナ５７のプッシュピン５９によりボール６６を押して第１ピストン６０の油圧を制御し、ローブレーキＬ／Ｂの締結度合いを緩和させて逆負荷トルクを遮断する。【選択図】図８