Abstract: An additional speed change mechanism (11) is incorporated in a vehicle-driving power transmission path of a tractor. The change mechanism is disposed within a main clutch housing (1) using axially spaced front and rear bearing support frames (6, 7) as supports for transmission shafts (9, 10, 11) associated to the mechanism. The front frame is fixedly mounted on a front surface of an internal flange (5) on the housing and may also be used as a support for preassembling the mechanism at the outside of clutch housing. The rear frame is fixedly mounted on a front surface of rear wall (1a) of the housing and may be varied in configuration in accordance with a given design of the change mechanism. An adaptability to various designs of the change mechanism is given while assuring an easy assemblage of the change mechanism into the clutch housing.

Abstract: An HST housing axle driving apparatus for a small-sized running vehicle, such as a tractor, in which an axle casing is divided into a left-side half axle casing and a right-side half axle casing. In one of the left- and right-side half axle casings are disposed a hydraulic pump provided with a vertical pump shaft and a hydraulic motor provided with a horizontal motor shaft. In the other of the left- and right-side half axle casings are disposed a speed reduction shaft and a differential gear unit, so that a driving force is adapted to be transmitted from the vertical pump shaft to said horizontal motor shaft.

Abstract: An axle driving apparatus wherein a hydraulic motor and a hydraulic pump for a hydro-static-transmission are housed in a transmission casing of the axle driving apparatus and a center section for connecting the hydraulic motor and hydraulic pump is disposed in the transmission casing, the center section being fixed at the butt joint portion at the transmission casing, and an oil passage from the hydraulic pump to the hydraulic motor at the center section is bent at a right angle so as to extend the motor shaft in parallel to the axles, so that the rotation direction of the motor shaft conventionally changed by bevel gears is changed by the oil passages in the center section.

Abstract: Speed-change shaft (12) of a key-shift transmission mechanism (15) is divided axially into hollow first and second shaft halves (21, 23) through which one (14) of co-axially disposed wheel axles (13, 14) extends. A plurality of speed-change gears (17F.sub.1 -17F.sub.5) are rotatably mounted on the first shaft half (21), whereas a shifter sleeve (22) for shifting a gear-coupling shift key (19) is slidably mounted on the second shaft half (23). A brake drum (25) including therein an aperture (25a) for passing the shift key is sandwiched between and engaged to the shaft halves for providing a vehicle-braking brake (24) within the casing (10). The second shaft half (23) may preferably be made of a polymer material for cost- and weight-reducing purposes. A key-receiving axial groove (18) may be formed in each of the shaft halves (21, 23) with ease because of a shortness of such each shaft half.

Abstract: An HST housing axle driving apparatus for a small-sized running vehicle, such as a tractor, in which an axle casing is divided into a left-side half axle casing and a right-side half axle casing. In one of the left- and right-side half axle casings are disposed a hydraulic pump provided with a vertical pump shaft and a hydraulic motor provided with a horizontal motor shaft. In the other of the left- and right-side half axle casings are disposed a speed reduction shaft and a differential gear unit, so that a driving force is adapted to be transmitted from the vertical pump shaft to the horizontal motor shaft.

Abstract: A transmission casing (3) having a wheel axle (6) extending leftwards and rightwards therefrom is supported by a machine frame (1) rotatably about the axle for providing a main clutch (9) which is engaged and disengaged by a selective tightening and loosening of an input belt (8) for the transmission casing as a result of a selective rotational displacement of the casing. An auxiliary clutch (10) is disposed within the casing and between a speed-change mechanism (7) and the axle. These clutches (9, 10) are normally kept disengaged by individual spring means (12, 13).A rotatable clutch-control arm (11; 116) is provided which is operated by a clutch lever (14) so as to engage the auxiliary clutch (10). Upon completion of an engagement of this clutch, the control arm is engaged to a stop means (15) on the transmission casing such that further rotational displacement of this arm causes a rotational displacement of the casing towards a direction of engaging the main clutch (9).

Abstract: An HST system driving speed changing apparatus, including a hydraulic motor, which constitutes the HST system driving speed changing apparatus wherein the transmission case of the apparatus is also used as the hydraulic motor case. This construction facilitates assembly of the apparatus and therefore allows a savings in manufacturing cost. Also disclosed is an HST system driving speed changing apparatus, which provides a separate hydraulic pump. The pump has a changeable mounting position at the side surfaces of the transmission case, whereby the pump shaft can correspond to whichever direction the crank shaft of the engine is disposed.

Abstract: A transmission formed of aluminum die casting which has disposed therein a differential gear and speed reduction gears. The case is provided at the outer surface thereof with a hydro-static transmission system. The transmission case is divided horizontally into three sections at two planes, one of which passes through the axis of each driving axle of the tractor, the other of which passes through the axes of the speed reduction gears.

Abstract: Left and right side clutches (15) and side brakes (18), each fashioned into a frictional disk type, are disposed between an axle-driving power output shaft (12) and left and right wheel axles (11). Axially spaced left and right side clutch gears (13) which carry, at boss portions thereof, left and right clutch housings (14) extending towards each other are rotatably mounted on the output shaft. The clutch of each side is disposed within each of the housing (14) and includes frictional elements (17) supported by the housing. The brake of each side is disposed within a space around each housing (14) and includes frictional element(s) (20) supported by the housing.The clutch and brake of each side are operated by a single mechanism including a shifter sleeve (22), slidably mounted on the housing (14), and a pivotal clutch control arm (21) extending through a peripheral wall of the housing.

Abstract: A driving power transmission which is simply changeable of the axis of a counter shaft in order to facilitate a change in a reduction ratio and mountable of a gear train different in the reduction ratio and which inserts a bevel gear to be fitted onto an output shaft at the transmission unit into a mission case prior to coupling of a lower mission case thereof with an upper mission case and places the bevel gear on a mounting table so that the bevel gear can be fitted onto the output shaft only by being later inserted into the bevel gear.

Abstract: An axle driving apparatus for a small-sized vehicle, such as a tractor, which divides its axle casing into first and second axle casings. A hydraulic pump, provided with a vertical pump shaft, is disposed within one of the axle casings. A hydraulic motor, provided with a horizontal motor shaft; a speed reduction shaft; and a differential gear unit, are disposed within the other of said axle casings. This configuration allows a driving force to be transmitted from the vertical pump shaft to the horizontal motor shaft.

Abstract: Separate left and right hydrostatic transmissions (17) for controlling rotation of left and right final drive wheels (11) of a working vehicle independently are disposed laterally inwardly of the drive wheels in a vertical posture such that, while an input shaft (18) is directed axially outwardly of the vehicle, an output shaft (19) is directed axially inwardly of the vehicle. To each of the hydrostatic transmissions is attached a L-shaped gear box (20) which extends over axially inward and laterally outer sides of the hydrostatic transmission and supports the axle (21) of final drive wheel. Within the box is housed first and second reduction gear trains which form L-shaped transmission path between the output shaft and axle.The hydrostatic transmission (17) and gear box (20) of each side may be handled as a unit in assembling the transmission system and are compactly disposed in the proximity of each final drive wheel (11).

Abstract: Separate left and right hydrostatic transmission (15) for controlling rotation of left and right final drive wheels (11) of a working vehicle independently are disposed laterally inwardly of the drive wheels in a vertical posture such that, while an input shaft (23) extends upwardly, an output shaft (24) extends downwardly. To each of the hydrostatic transmissions is attached a L-shaped gear box (16) which extends over lower and outer sides of the hydrostatic transmission and supports the axle (17) of final drive wheel at its upstanding portion. within the box is housed first and second reduction gear trains which form a L-shaped transmission path between the output shaft and axle.

Abstract: A hollow shaft composed of a pair of trough-shaped shaft halves (15A) is employed as a speed-change shaft (15) for a key-shift transmission. Each of the shaft halves includes at both sides of an arched inner surface a pair of axially extending flattened end surfaces one of which has thereon an axially elongated projection (19) and the other of which has therein an axially elongated recess (20). The shaft halves are engaged to each other co-rotatably by fitting the projections of the respective shaft halves into the recesses of the other respective shaft halves. The projections and recesses are sized such that a pair of elongated axial grooves (21) are formed in an outer surface of the change shaft. A pair of shift keys (18) are disposed within such axial grooves for coupling speed-change gears (16F.sub.1 -16F.sub.5) selectively to the change shaft.

Abstract: Construction of an axle driving apparatus disposing therein left and right driving axles and differential gears of a traveling vehicle. The driving case of the axle driving apparatus is formed of aluminum die casting to enable assembly by reducing machined portions as much as possible, and divided into a first driving case and a second driving case by a parting line P passing through the center of the axle, so that the built-in surface along the parting line P is used to put, between the split portions, the differential gear or other part, thereby enabling the assembly and saving the manhours for the assembly work.

Abstract: A front and rear transmission casing are joined to form a single casing. Upper and lower input shafts are received and supported by the front casing. The lower input shaft drives a change speed gearing with a speed change shaft and a pinion shaft. The pinion shaft has a pinion gear located on a further end of the shaft and engages a ring gear of a differential. The upper input shaft drives a clutch driven shaft through a PTO clutch unit. A rear PTO shaft is driven by the clutch driven shaft and extends out of the rear casing. A mid PTO shaft is also driven by the clutch driven shaft and extends out of the front casing.