HST TRAVELING SYSTEM OF WORK MACHINE

WIPO Patent Application WO/2006/109571

A1

An HST traveling system of a work machine capable of eliminating the need of a transmission and a propeller shaft and providing speeds and tractive forces suitable for various types of works without using the transmission. The capacities of two hydraulic motors (10) and (20) of an HST transmission device (30) are made equal to each other, and a speed reduction ratio twice that of a rear wheel side speed reducer (21) of a traveling device (12) and (22) is provided to a front wheel side speed reducer (11) of a traveling device (12) to set the ratio of the speed reduction ratio of the front wheel side speed reducer (11) to the speed reduction ratio of the rear wheel side speed reducer (21) to 2:1. The HST transmission device (30) comprises a changeover valve (41), a selector switch (42), and a controller (43), and can be switched between a low-speed four-wheel drive mode for driving both the traveling devices (12) and (22) and a high-speed two-wheel drive mode for driving only the rear wheel side traveling device (22).

SUGAYA MAKOTO (JP)
TOYOOKA TSUKASA (JP)
SATAKE HIDETOSHI (JP)
ICHIMURA KAZUHIRO (JP)

PCT/JP2006/306468

October 19, 2006

March 29, 2006

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HITACHI CONSTRUCTION MACHINERY (JP)
SUGAYA MAKOTO (JP)
TOYOOKA TSUKASA (JP)
SATAKE HIDETOSHI (JP)
ICHIMURA KAZUHIRO (JP)

B60K17/10; B60K17/356; F16H61/44; F16H61/444; F16H61/452; F16H61/456

JP2004210051A	2004-07-29
JP2004210215A	2004-07-29
JP2002345105A	2002-11-29
JP2003025862A	2003-01-29
JPH082270A	1996-01-09
JP2004237776A	2004-08-26
JPH09309352A	1997-12-02

Kasuga, Yuzuru (4-1 Nihonbashi-honcho 3-chome, Chuo-k, Tokyo 23, JP)

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