POWER TRANSMISSION DEVICE

• Main Authors: TSUKAMOTO KAZUMASA, KATO HIROSHI, SUGIURA NOBUTADA
• Format: Patent
• Language: English; Japanese
• Published: 23.04.2015
• Subjects: BLASTING; BRAKES; CLUTCHES; COUPLINGS FOR TRANSMITTING ROTATION; 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 enable the automatic gear change of a second transmission, in a power transmission device comprising the second transmission which is interposed between a stepped first transmission and has an engaging clutch.SOLUTION: A power transmission device comprises a second transmission 40 having a planetary gear mechanism 45 in which a ring gear 47 and a planetary carrier 49 are connected to an output shaft 27 of a first transmission 25 and drive wheels, a dog clutch 50 which performs the connection and release of the ring gear 47 and the planetary carrier 49, and a two-way clutch 52 interposed between a sun gear 46 of the planetary gear mechanism 45 and a transmission case 22. The two-way clutch 52 regulates the rotation of the sun gear 46 in a direction opposite to the ring gear 47 at forward traveling. When the dog clutch 50 is released, and a pedal-in amount of an accelerator pedal is reduced, the second transmission 40 is gear-changed by being engaged with the dog clutch 50 accompanied by a decrease of a rotation number of the ring gear 47 and an increase of a rotation number of the sun gear 46. 【課題】有段の第１変速機と車軸との間に介在し且つ噛み合いクラッチを有する第２変速機を備えるものにおいて、第２変速機の自動変速を可能とする。【解決手段】第１変速機２５の出力軸２７と駆動輪とにリングギヤ４７とプラネタリキャリヤ４９とが接続された遊星歯車機構４５と、リングギヤ４７とプラネタリキャリヤ４９との接続およびその解除を行なうドグクラッチ５０と、遊星歯車機構４５のサンギヤ４６とトランスミッションケース２２とに介在するツーウェイクラッチ５２と、を有する第２変速機４０を備える。ツーウェイクラッチ５２は、前進走行時にサンギヤ４６のリングギヤ４７とは反対方向の回転を規制する。ドグクラッチ５０を解放しての走行中にアクセルペダルの踏込量が減少したときに、リングギヤ４７の回転数の低下とサンギヤ４６の回転数の上昇とを伴ってドグクラッチ５０を係合して第２変速機４０を変速する。【選択図】図２