To provide a hydraulic type continuously variable transmission for traveling capable of ensuring stop on slope under high load situation, keeping a stop state on a flat land under a low load situation, and enabling smooth start.SOLUTION: An HST 3 constituted by combining an axle driving case 10, a hydraulic pump 39, a hydraulic motor 33, and a first oil passage 32a and a second oil passage 32b fluid-connecting the hydraulic pump 39 and the hydraulic motor 33, includes an NCV 90 and an IDS 60 capable of opening each of the oil passages 32a, 32b to the axle driving case 10. The NCV 90 includes a first orifice 94 for opening the first oil passage 32a to the axle driving case 10 when a pressure of the first oil passage 32a is a prescribed pressure or less, and communicating the second oil passage 32b to the axle driving case 10 when a pressure of the second oil passage 32b is the prescribed pressure or less. The IDS 60 includes second orifices 63, 64 for communicating a high pressure side of the oil passages 32a, 32b to the axle driving case 10 when the hydraulic pump 39 has a prescribed discharge amount or less.SELECTED DRAWING: Figure 11

    【課題】走行用油圧式無段変速装置の高負荷状況下での坂道停車を確実なものとし、また低負荷状況下における平坦地での停止状態を維持し、スムーズな発進を可能にする。【解決手段】車軸駆動ケース10、油圧ポンプ39、油圧モータ33、油圧ポンプ39と油圧モータ33とを流体接続する第一油路32aおよび第二油路32b、を組み合わせてなるHST3は、各油路32a・32bを車軸駆動ケース10に開放可能とするNCV90とIDS60を備え、NCV90は、第一油路32aの圧力が所定圧力以下の場合に第一油路32aを車軸駆動ケース10に開放し、第二油路32bの圧力が前記所定圧力以下の場合に第二油路32bを車軸駆動ケース10に連通する第一オリフィス94を備え、IDS60は、油圧ポンプ39が所定の吐出量以下の場合に各油路32a・32bのうちの高圧側を車軸駆動ケース10に連通する第二オリフィス63・64を備える。【選択図】図11


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    Titel :

    HYDRAULIC TYPE CONTINUOUSLY VARIABLE TRANSMISSION FOR TRAVELING


    Weitere Titelangaben:

    走行用油圧式無段変速装置


    Beteiligte:

    Erscheinungsdatum :

    09.04.2020


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    F16H Getriebe , GEARING / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F04B Verdrängerkraft- und Verdrängerarbeitsmaschinen für Flüssigkeiten , POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS



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