Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid pump and motor in one of plural paths to or from...
Patent
1993-05-24
1995-11-14
Look, Edward K.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid pump and motor in one of plural paths to or from...
475 80, F16H 4704
Patent
active
054661978
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a mechanical - hydraulic transmission which is capable of selecting a plurality of driving speed modes in respective driving in forward- and rearward-movement directions.
2. Background Art
As a conventional transmission of the kind referred to above, transmissions are known which are disclosed in respective specifications of U.S. Pat. No. 3,426,621 and Japanese Patent Laid-Open No. HEI 2 - 14979.
Each of these publicly known forward- and rearward-movement multi-stage transmitting mechanical - hydraulic transmissiones is so arranged as to be provided with a mechanical power transmitting section of two- shaft parallel type.
The above-described former is so arranged that a transmitting section which modifies or alters a rotational direction and rotational speed of inputted power is installed on a mechanical transmitting power input system shaft which lays down so as to extend perpendicular to a longitudinal direction (fore and aft directions) of a vehicle body, a power output shaft system is juxtaposed in parallel with a mechanical power input system shaft, and mechanical - hydraulic transmitting power is outputted in a power output shaft system direction.
Further, the latter of the aforesaid prior art is arranged such that a power transmitting system shaft lays down so as to extend perpendicular to a longitudinal direction of a vehicle body, a mechanical transmitting section for changing or modifying a rotational direction and rotational speed of inputted power and a differential planetary gear mechanism of composition of mechanical - hydraulic powers are installed in series in the axial direction, and a static hydraulic transmitting device is juxtaposed in parallel to the power transmitting system shaft, to output the mechanical - hydraulic transmitting power to both sides in a widthwise direction of the vehicle body.
In short, any one of these mechanical - hydraulic transmissions of the prior art is provided with crawler-belt steering devices of crawler-type vehicles on both outsides of the transmitting output system shafts, to exhibit transmitting and steering function.
In the above-mentioned prior art, in a manner in which mechanical - hydraulic transmitting power is outputted on both sides in the widthwise direction of the vehicle body, and the crawler-belt steering devices are equipped on both sides of the output shaft, wide housing or storage space is required in the widthwise direction of the vehicle body. This makes difficult loading of the transmission to an existent production vehicle.
Such mechanical - hydraulic transmission has the following problems and the like. That is, since the crawler-belt steering device is brought to exclusive one, it is impossible to combine the mechanical - hydraulic transmission with the existent crawler-belt steering device, there is no loading interchangeability with other existent transmitting devices with respect to the same or identical rank vehicle, and the like.
Furthermore, the above-described prior art is an arrangement in which a single clutch exclusive for each speed ratio is engaged, to thereby form a speed condition. For this reason, power transmitting paths extending from the input shaft to a differential gear are required only for the number of speed ratios in parallel relation to each other. In a case where arrangements each having such clutch arrangement are disposed on a single shaft so as to be capable of being loaded on an already existent production vehicle, since power transmission between the input shaft and the differential gear is brought to a multiple hollow shaft, an arrangement thereof is complicated.
SUMMARY OF THE INVENTION
The invention has been done in view of the above, and an object of the invention is to provide a mechanical - hydraulic transmission for a crawler-type vehicle, in which dimension in a widthwise direction is reduced; there is loading interchangeability with other speed-change transmitting devices with respect to crawler-belt vehicles having the same vehicle r
REFERENCES:
patent: 3426621 (1969-02-01), Mooney, Jr.
patent: 5222921 (1993-06-01), Garcia
Ishino Tsutomu
Maruyama Ryoichi
Mitsuya Hiroyuki
Yamada Hideki
Kabushiki Kaisha Komatsu Seisakusho
Larson James A.
Look Edward K.
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