Kanzaki Kokyukoki Mfg. Co., Ltd.

Toshiro Azuma

Kazuhiko Yano

Ryota Ohashi

Kojiro Yamaoka

Koichiro Fujisaki

Hideaki Okada

Shusuke Nemoto

Shigenori Sakikawa

Toshiaki Okanishi

Jiro Shibata

Hiroshi Kitagawara

Masashi Inanaga

Masaaki Kojima

Toshiyuki Hacegawa

Yasuo Seno

Masao Nakayachi

Atsushi Odagaki

A hydrostatic vehicle driving system structured from an engine to a drive axle in a working vehicle. A hydraulic pump driven by the engine and a variable displacement hydraulic motor for driving the drive axle are fluidly connected with each other through a hydraulic circuit. A motor capacity control system controls capacity of the hydraulic motor in correspondence to the condition of load on the engine. The motor capacity control system comprises load-detection means detecting hydraulic pressure in the hydraulic circuit replacing the load on the engine, a hydraulic actuator for changing the capacity of the hydraulic motor, and actuator-control means controlling the hydraulic actuator according to the detection of hydraulic pressure by the load-detection means.

Hydrostatic vehicle driving system applicable to a working vehicle

The present invention provides a vehicle traveling control apparatus for a vehicle with an HST and a mechanical transmission, which are connected in tandem to each other and interposed in a traveling power transmission path between a driving power source and driving wheels. The vehicle traveling control apparatus includes a speed-change control mechanism which in turn includes a signal detection part and a control part for controlling the changing of the output speed of the HST and the shifting operation of the mechanical transmission. The signal detection part includes a load-torque detection means. The control part is designed to control the mechanical transmission and the HST based upon the detected results by the load torque detection means so that where the vehicle lies in a high load torque state, the control part downshifts the mechanical transmission to a lower speed stage, while increasing the output speed of the HST.

Vehicle travelling control apparatus

A first hydraulic pump P driven by power of an engine and a first hydraulic motor M are fluidly connected so as to form a closed fluid circuit. An output shaft of first hydraulic motor M is drivingly connected with a sub-transmission The output power from sub-transmission drives main-driving wheels and also drives a second hydraulic pump P fluidly connected with a second hydraulic motor M for driving sub-driving wheels A clutch is interposed between an output shaft of sub-transmission and an input shaft of second hydraulic pump P or on the output side of second hydraulic motor M Second hydraulic pump P or second hydraulic motor M has variable displacement, so that second hydraulic motor M is drivingly accelerated in proportion to the degree of turning operation of a steering operating tool In case that a plurality of front reel mowers FL, FM and FR are disposed in front of the vehicle body, a pair of decelerator casings are disposed on both lateral sides of transmission casing for driving main-driving wheels Decelerator casings project horizontally forward and support main-driving wheels respectively at their front portions. Middle front reel mower FM is disposed between left and right decelerator casings

Driving system for a working vehicle

A first hydraulic pump P,driven by power of an engine and a first hydraulic motor M,are fluidly connected so as to form a closed fluid circuit. An output shaft,of first hydraulic motor M,is drivingly connected with a subtransmission,. The output power from sub-transmission,drives main-driving wheels,and also drives a second hydraulic pump P,fluidly connected with a second hydraulic motor M,for driving sub-driving wheels,. A clutch,is interposed between an output shaft,of sub-transmission,and an input shaft,of second hydraulic pump P,or on the output side of second hydraulic motor M,. Second hydraulic pump P,or second hydraulic motor M,has variable displacement, so that second hydraulic motor M,is drivingly accelerated in proportion to the degree of turning operation of a steering operating tool,. In case that a plurality of front reel mowers,FL,,FM and,FR are disposed in front of the vehicle body, a pair of decelerator casings,are disposed on both lateral sides of transmission casing,for driving main-driving wheels,. Decelerator casings,project horizontally forward and support main-driving wheels,respectively at their front portions. Middle front reel mower,FM is disposed between left and right decelerator casings

A four-wheel hydraulic drive system for a working vehicle comprising a hydraulic pump, a first hydraulic motor fluidly connected with said hydraulic pump, a pair of first driving wheels driven by said first hydraulic motor, a second hydraulic motor fluidly connected with said hydraulic pump, and a pair of second driving wheels driven by said second hydraulic motor, wherein the drive mode of said vehicle can be switched between a first four-wheel drive mode for substantially equaling the torque of said second hydraulic motor to that of said first hydraulic motor and a second four-wheel drive mode for making the torque of said second hydraulic motor smaller than that of first hydraulic motor.

Four-wheel hydraulic drive system for working vehicle

A transmission has a pair of hydraulic motors for hydraulically driving crawler type vehicles. The hydraulic motors are connected by a drive train having rotary members. The hydraulic motors are disposed such that a rotary axis of an output shaft on one hydraulic motor is offset from a rotary axis of an output shaft on the other hydraulic motor. A clutch is provided between one output shaft and another rotary member, which is coaxially disposed on the one output shaft. The clutch in accordance with the invention improves the accuracy of straight forward movement of the vehicle. In accordance with the invention, when a steering unit for steering the vehicle is moved to a steering position, for turning the vehicle, and a non-steering position, for straight forward movement of the vehicle, vehicle impact and clutch damage are reduced. The transmission can also be made more compact. In addition, a parking brake can be equipped on the other output shaft.

Traveling transmission for a vehicle

In a vehicle multi-ratio transmission comprising a plurality of change-speed gear trains, including a backward directional gear train, with which synchronizer clutches are associated for actuating same, two multidisc-type synchronizer clutches (12) are employed for actuating one of forward directional gear trains, which is operated under a heavy condition, and for actuating the backward directional gear train. Cone-type synchronizer clutches (11) are employed for actuating the other gear trains. Seizing of clutch members as well as an unexpected start of the vehicle at a neutral condition of the transmission are well prevented and increase of cost for securing these advantages is suppressed.

Vehicle multi-ratio transmission

An axle driving apparatus which is so constructed that an input pulley for engine power is set lower in mounting position with respect to the axis of a driving axle so as to enable the platform of a vehicle to be lowered. The engine position lowers to promote miniaturization, a lower center of gravity and running stability of the vehicle. For maintenance of the transmission for driving the axle, the entire axle driving apparatus need not be removed from the frame of the vehicle. A bearing for supporting the axle to the casing is held with exact dimensional precision so as not to cause a backlash on the axle, to thereby prolong the life span of the bearing. The axle is ensured to be sealed, the number of mounting bolts for the casing need not be increased in order to improve rigidity, and the casing is strong so that the assembly time for the axle driving apparatus is minimized.

Axle driving apparatus

An axle driving apparatus which houses a hydraulic non-stage transmission in a casing comprised of at least two casing members and coupled by a substantially flat coupling surface formed therebetween. The casing also houses an output shaft of the hydraulic non-stage transmission which is offset in parallel to the coupling surface. This construction allows for simple manufacture and maintenance of the hydraulic non-stage transmission and axles, provides for a smaller downward projection of the casing thereby reducing interference with obstacles on the ground, improves sealing capability of the casing when a braking unit is attached to one axial end of the output shaft, and reliably bears the thrust of the hydraulic motor.

Axle driving apparatus having offset output shaft

An axle driving apparatus which is so constructed that an input pulley for engine power is set lower in mounting position with respect to the axis of a driving axle so s to enable the platform of a vehicle to be lowered. The engine position lowers to promote miniaturization, a lower center of gravity and running stability of the vehicle. For maintenance of the transmission for driving the axle, the entire axle driving apparatus need not be removed from the frame of the vehicle. A bearing for supporting the axle to the casing is held with exact dimensional precision so as not to cause a backlash on the axle, to thereby prolong the life span of the bearing. The axle is ensured to be sealed, the number of mounting bolts for the casing need not be increased in order to improve rigidity, and the casing is strong so that the assembly time for the axle driving apparatus is minimized.

An improvement in the conventional axle driving apparatus in which a pair of crescent oil passages open at a motor mounting surface of a center section are formed across an upper half casing and a lower half casing. The improved axle driving apparatus of the present invention is designed to uniformly disperse and receive by the upper and lower half casings the radial load acting on the swash plate holder formed across the joint surface between both the upper and lower half casings, thereby expecting a low manufacturing cost of the axle casing.

Axle driving apparatus with variable depth crescent oil passages

A hydraulic four-wheel drive apparatus for driving by a hydraulic motor four wheels: steering wheels and driving wheels, in which the steering wheels are driven by a variable capacity motor for the steering wheels and a front differential gear unit, and the driving wheels are driven by a fixed capacity motor for the driving wheels, so that, when a vehicle turns, a swash plate of the variable capacity motor associates with operation of a steering handle, thereby accelerating the speeds of steering wheels.

Hydraulic four-wheel drive system

The present invention provides a simple and compact power transmission mechanism for a tractor or similar vehicle having mounted thereto a mechanical attachment such as a lawn mower. The power transmission mechanism includes an engine which transmits driving power to ground engaging wheels through a driving power transmission unit and to the mechanical attachment through a driving speed changing unit positioned atop the transmission unit and operatively interconnected to the drive shaft thereof. The driving speed changing unit includes an input shaft which receives engine driving power for driving the drive shaft through a differential gear unit. Engine power is transmitted to the attachment through a belt from a power take-off unit coupled to the input shaft.

Power transmission mechanism for tractor

A front wheel speed-up mechanism for a four wheel drive vehicle when turning, which, when front wheels serve as steering wheels, corrects a delay at the rotational circumferential speed of the front wheels later than the actual moving speed when the vehicle is turning, thereby gradually increasing the rotational circumferential speed of the front wheels in proportion to a length of a turning radius thereof.

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Amagasaki, Japan

Toshiro Azuma