Kanzaki Kokyukoki Mfg. Co., Ltd.

Kazuhiko Yano

Toshiro Azuma

Ryota Ohashi

Kazuhiko Ohtsuki

Shigenori Sakikawa

Kojiro Yamaoka

Koichiro Fujisaki

Gen Yoshii

Toshiaki Okanishi

Takao Awaya

Kazuhiko Otsuki

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

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 variable displacement type hydraulic system is contained in a housing. A guide is provided on an axis of slanting movement of a swash plate. The guide is fitted into an inner ring of a roller bearing. The roller bearing is fitted into a groove formed at an inner wall of the housing and a groove formed at a cylinder block mounting surface of a center section so as to be fixedly positioned in the housing. In accordance with the invention, sliding resistance of the swash plate is reduced to improve the ability of the swash plate to return to the neutral position.

Variable displacement type hydraulic system

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 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.

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

A steering apparatus for a vehicle which is provided at part of a handle shaft of a handle with a steering mechanism so that a steering cylinder expands and contracts to perform hydraulic steering and, even when a hydraulic system is in trouble, the steering mechanism serves as a speed reduction mechanism, thereby enabling mechanical steering.

Steering apparatus for a vehicle

A reversing gear assembly (13) for use in yachts having an angle drive system comprises a horizontal input shaft (15), to be connected to a horizontally mounted engine (11), and an inclined output shaft (16) to be connected to the propeller shaft (12). Gear casing (14) includes an intermediate shaft (17) which extends parallel with the output shaft (16). The forward direction drive path includes meshing cylindrical gear (18) and conical gear (20) on the input and output shafts (15, 16). The reverse direction drive path has on the input and output shafts (15, 16) two cylindrical gears (19, 21) with which a skew cylindrical gear (22) on the intermediate shaft (17) meshes at respective axial halves of the skew gear. The center of engagement between the meshing gears (19, 22) on the input and intermediate shafts (15, 17) is located on the sole, common perpendicular line of these shafts. A reversing clutch (23) is disposed on the output shaft (16). The minimum number of shafts and gears for attaining the forward and reverse direction drives and a speed reduction in a reversing gear assembly is three shafts and five gears. Using only one conical gear in such an assembly reduces the troublesome backlash-adjusting work associated with conical gears.

Reversing gear assembly for yachts

A reversing clutch assembly (13) for marine angle drive which allows the engine (11) to be mounted horizontally. To provide a required inclination to propeller shaft (12), the transmission path is bent within clutch casing (14) by using conical gearing. The casing (14) includes three horizontal shafts or input shaft (15), clutch shaft (17) and intermediate shaft (18), and only one inclined shaft or output shaft (16). Clutch shaft (17) has thereon forward and backward direction gears (28, 29) which are driven by the input shaft (15) through gear trains comprising spur gears, and double-acting clutch mechanism (30) for selectively coupling each of the direction gears (28, 29) to clutch shaft (17). The conical gearing is disposed only between clutch shaft (17) and output shaft (16) and thus includes only one conical gear (38). Parallel arrangement of three shafts (15, 17, 18) and use of single conical gear (38) contribute to save cost of the clutch assembly.

Marine reversing clutch assembly

A marine propulsion unit having an engine (13) mounted with the output end directed toward the stern of a boat is disclosed in which a required inclination of propeller shaft (15) is provided outside a reversing clutch mechanism (17) by an intermediate shaft (32) and a pair of meshing bevel gears (38, 39) incorporated in the transmission path. The bevel gears (38, 39) are fixedly mounted on either of output shaft (21) or input shaft (20) of the clutch mechanism (17) and the intermediate shaft (32) among which one of the shafts taking a rearer position is inclined relative to the other shaft downwardly and backwardly. These two shafts are disposed relative to each other so that opposed ends thereof take substantially a same level. The propulsion unit permits a low level mounting of engine and may be manufactured with a low cost while permitting to employ a reversing clutch mechanism in boats having different layouts of propulsion unit.

Marine propulsion unit

In the marine V-drive or similar drive system, a novel gearing is employed which provides a bend or turn of power transmission path toward a rearwardly and downwardly inclined propeller shaft in a compact fashion. The gearing comprises a pair of mutually meshed spur gears respectively mounted on a reversing clutch output shaft and a transmission shaft to which the propeller shaft is coupled. Among these spur gears, a first spur gear coaxial with the shaft mounting such first gear is fixedly secured to the said shaft. A second spur gear inclined relative to the shaft mounting such gear is connected operatively to the said shaft particularly by means of constant velocity universal joint disposed within the second gear. The inventive propulsion device is economical owing to the elimination of bevel gear mechanism.

Marine propulsion device

In a remote-controlled mechanical double clutch mechanism such as marine reversing clutch, a novel clutch engaging and disengaging means is employed which comprises an extensible and contractible coupling for a connection between push-pull means of remote control system and control lever associated to the clutch. The coupling includes spring means which is enlarged in spring force thereof due to extension and contraction of the coupling on the way of operating the clutch and provides some additional rotation to the control lever at the terminal moment of operation by the enlarged spring force. Such spring means avoids an unexpected disengagement of the clutch from an engaged condition as well as an unexpected engagement of the clutch from the disengaged condition. The novel clutch operating means may compensate manufacturing error of the remote control system and clearance due to abrasion and permits an easy adjustment and maintenance of such operating means.

Clutch engaging and disengaging means

A control valve having a rotor for communicating outlet port or ports selectively to fluid drain port or to inlet port so as to change flow direction of fluid to be supplied to fluid operated apparatus. The control valve comprises first and second pistons inserted in a hollow space of the rotor and a compression spring arranged between the pistons. At the operation position(s) of the rotor or the valve, the first piston which is biased by the compression spring oscillatingly blocks and reopens fluid passage formed within the rotor outside the first piston for communicating the inlet port to the outlet port(s) under the influence of the compression spring and fluid pressure of the outlet port(s) from which fluid is constantly drained with a small rate through the valve. Fluid pressure of the outlet port may be varied by varying the force of the compression spring by an advance of the second piston. Consequently, by controlling the advance of the second piston, fluid pressure of the outlet port(s), namely fluid pressure applied to the fluid operated apparatus may be controlled. The control valve thus functions not only as a change-over valve but as a valve for controlling fluid pressure applied to fluid operated apparatus.

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Amagasaki, Japan

Kazuhiko Yano