In order to increase the overall reduction ratio of a creep transmission while preventing an increase in the size of a transmission case in a travel transmission device for a tractor in which a creeptransmission device is accommodated in a transmission case, a creep transmission device 60 is provided with: a first transmission gear 66 provided on an output shaft gear 54b of a gear transmission 40; a first reduction gear 62 supported on a relay shaft 61 so as to be capable of relative rotation in a state of being engaged with the first transmission gear 66; a second transmission gear 67 provided on the first reduction gear 62; a second reduction gear 63 supported on an output shaft 43 of the gear transmission 40 so as to be capable of relative rotation in a state of being engaged with thesecond transmission gear 67; a third transmission gear 68 provided on the second reduction gear 63; a third reduction gear 64 supported on the relay shaft 61 so as to be incapable of relative rotationin a state of being engaged with the third transmission gear 68; and a reduction gear pair 65 that is provided across the relay shaft 61 and the output shaft 43, and that reduces and then transmits the power of the relay shaft 61 to the output shaft 43.

    爬行变速装置容纳于变速箱的拖拉机的行进用传动装置中,能够抑制变速箱的大型化且能够使爬行变速整体的减速比变高。爬行变速装置(60)具备第1传动齿轮(66)、第1减速齿轮(62)、第2传动齿轮(67)、第2减速齿轮(63)、第3传动齿轮(68)、第3减速齿轮(64)、减速齿轮对(65),前述第1传动齿轮(66)被设置于齿轮变速器(40)的输出轴齿轮(54b),前述第1减速齿轮(62)被在啮合于第1传动齿轮(66)的状态下能够相对旋转地支承于中转轴(61),前述第2传动齿轮(67)被设置于第1减速齿轮(62),前述第2减速齿轮(63)被在啮合于第2传动齿轮(67)的状态下能够相对旋转地支承于齿轮变速器(40)的输出轴(43),前述第3传动齿轮(68)被设置于第2减速齿轮(63),前述第3减速齿轮(64)被在啮合于第3传动齿轮(68)的状态下不能相对旋转地支承于中转轴(61),前述减速齿轮对(65)被遍及中转轴(61)和输出轴(43)地设置,将中转轴(61)的动力减速后向输出轴(43)传递。


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    Title :

    TRACTOR, TRAVEL TRANSMISSION DEVICE FOR TRACTOR, AND TRACTOR EQUIPPED WITH TRAVEL TRANSMISSION DEVICE FOR TRACTOR


    Additional title:

    拖拉机、拖拉机的行进用传动装置、及具备该拖拉机的行进用传动装置的拖拉机


    Contributors:

    Publication date :

    2021-04-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    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






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