Abstract: An automatic transmission with a reverse inhibit feedback passage between front and rear oil sumps. The transmission includes a case, a passage in the case for returning oil to the front sump from the rear sump and a flap valve for allowing the flow from rear sump to front sump while inhibiting oil flow in the reverse direction.

Abstract: An electric motor gearbox for a vending machine has four main parts: a housing, a minimotor, a printed circuit board, and an assembly of gears. An output pinion and an output gear are so strong that they permit the minimotor to stall before the assembly fails in response to jamming of a product item in the vending machine. Also, the motor gearbox is less prone to failure caused by constant starting and stopping, excessive flexibility of a gearbox housing cover, intermittent vibrations, and the like.

Abstract: A miniature reduction gear includes a sun gear, a fixed inner gear and a movable inner gear and at least one planetary gear. The planetary gear is formed of three stages of outer teeth. Each outer tooth stage separately engages one of a sun gear, fixed inner gear and movable inner gear. The sun gear provides an input to the miniature reduction gear and the movable inner gear provides an output. The number of teeth of the planetary gear which engage with the sun gear is greater than the number of teeth which engage with either of the fixed inner gear or movable inner gear.

Abstract: A plurality of engine transmission assemblies for powering vehicles wherein the engine is provided with an integral crankcase transmission assembly that is made up of first, second and third pieces that are connected to each other. The first and second pieces meet along a plane in which the axis of rotation of the engine crankshaft lies. The third piece is affixed to the first and second pieces along a plane that is perpendicular to the first plane and which contains the axis of rotation of the transmission primary shaft and either the transmission secondary shaft or the transmission shift shaft. The constructions have high rigidity and also ease of servicing.

Abstract: A universal starter motor assembly, which may be affixed to many different makes and models of internal combustion engines. A starter motor and solenoid assembly of the gear reduction type has a face plate which covers the armature gear, supports the idler gear and the outer bearing of the clutch assembly extends through the face plate. Many different styles of mounting adapters can be easily attached to the face plate and are shaped and configured to permit the starter motor assembly to be affixed to a particular style of internal combustion engine. The pinion gear of the starter motor is removable and replaceable from the exterior of the universal starter motor.

Abstract: A grease guide structure for a transmission device suitable for a sunroof of an automobile or the like. The transmission device includes a worm wheel and a pinion shaft, which are drivingly connected through a friction clutch mechanism. In order to prevent grease flowing from the worm wheel onto the friction clutch mechanism, a cup washer is mounted between the worm wheel and the friction clutch mechanism, with the center portion of the cup washer being higher than its peripheral portion. Therefore, if grease falls onto the cup washer, it will further flow and finally fall into a grease intake slot which is arranged below the cup washer to be stored therein.

Abstract: A system is provided for conveying fluid lubricant forwardly to lubricate a forward bearing support member (26) of a vehicular tandem axle assembly (100). The system includes a first open-sided trough (38) in to which the fluid lubricant is deposited by a differential gear assembly (14). Trough (38) is in fluid communication with a second open-sided trough (40) that slopes forwardly and downwardly to the center line of bearing member (26) and is effective to enable the fluid lubricant to flow towards and lubricate bearing member (26) while the vehicle is ascending an incline.

Abstract: A mounting arrangement for an automotive vehicle includes a transverse engine having a crankshaft with an axis of rotation extending transversely to a longitudinal axis of the vehicle, a gear train of a transmission having an axis which extends in parallel with the axis of the engine crankshaft, and a differential gear unit having an axis which extends in parallel to the axes of the engine crankshaft and the transmission gear train. The axis of the engine crankshaft is located rearward of the axis of the transmission gear train and over the axis of the differential gear unit, and the axis of the differential gear unit is located rearward of the axis of the transmission gear train. Further, the engine to lower the engine hood line inclined forward.

Abstract: A transmission box with several bearings for shafts is disclosed. The transmission case (1) is produced by a plastic injection molded cast and comprises at least in part outer races (14) for the bearings (13), which are retained at a defined axial distance by a metallic precision insertion part (8) embedded into the plastic injection mold case (1).

Abstract: A compact integrated transaxle has a two-piece transaxle casing for rotatably mounting a pair of oppositely extending axles along a peripheral seam formed between an upper casing part and a lower casing part. A hydrostatic transmission is also mounted in the transaxle casing and has a center section positionable in the transaxle casing with a pair of perpendicular faces each mounting a hydraulic displacement unit. One of the center section faces defines a hydraulic pump mounting surface and is offset from the plane defined by the peripheral seam. A counter-rotating intermediate shaft is interposed between an output shaft on one of the hydraulic units and the axles and is journalled within the transaxle casing offset from the plane defined by the peripheral seam.

Abstract: A primary drive line for delivering power from a power-take-off (pto) shaft on a tractor to an input shaft on an implement includes a swivel hitch comprised of an upper gearbox and a lower gearbox. The upper gearbox is fastened to a pair of spaced apart, upper vertical plates carried on a tongue extending forwardly from the implement, and the lower gearbox is fastened to a pair of spaced apart, lower vertical plates carried by a yoke assembly that is attached to the tractor. An output shaft on the upper gearbox is coupled to the implement input shaft. The lower gearbox has two shafts, one of which is coupled to an input shaft on the upper gearbox. The other shaft on the lower gearbox is connected to the tractor pto shaft. A pivot tube secured to the upper vertical plates is surrounded by a pivot housing fastened to the lower vertical plates to permit pivoting movement of the lower gearbox relative to the upper gearbox about a generally vertical axis when the tractor makes turns during normal operation.

Abstract: In a toothed-wheel change gear, a gear pump for the conveyance of transmission oil is arranged in a separate gearbox chamber of a gearbox. Leakage oil flowing out at the gear pump is intermediately stored in the gearbox chamber in a controlled manner.

Abstract: A conventional lock-up solenoid having a long delivery tube and mounting bracket with outwardly extending mounting legs is mounted on a transmission torque converter case requiring a lock-up solenoid with a short delivery sleeve. This is accomplished by a spacer member constituted by a pair of spacers carried on threaded studs which are received in the tapped holes. In effect, the spacer shortens the long delivery tube so that it fits the space of a short delivery tube lock-up solenoid. If the transmission is one requiring a long delivery tube, it is installed without the spacer and as any other replacement lock-up solenoid.

Abstract: In a high-loaded, light-weight, compact, multi-stage gear transmission unit with at least one stage with non-parallel shafts, and a transmission ratio between approximately 70 and 150, like a helicopter transmission, said angle transmission generally forms the weakest link. By adoption of a face gear/cylindrical pinion-stage instead of the commonly used bevelled-stage, not only a more reliable drive is possible, but its efficiency is higher, due to less friction, its size is smaller, its adjustment is simpler such that straight forward replacement becomes possible, and - not in the least - the transmission ratio of said angle drive tends to high ratios in contrast to known bevelled-drives which tend to low ratios. In many cases one or even more stages less become possible, providing a further important reduction in weight and size.

Abstract: An axle driving apparatus which houses in a transmission casing thereof a hydraulic motor and a hydraulic pump of a hydro-static-transmission and disposes in the transmission casing a center section for connecting the hydraulic motor and hydraulic pump, thereby fixing the center section at the butt joint of the casing and which disposes an oil filter and check valves or the like in the center section so that lubricating oil in the transmission casing is made absorbable as operating oil for the hydro-static-transmission.

Abstract: The housing has a bell-shaped end portion with an axial aperture in which the output pinion of the starter motor unit is supported for rotation and a side aperture through which the pinion can mate with a rotary member of the internal combustion engine. The side wall of the bell-shaped portion opposite the side aperture has a recess with a flat wall portion extending in a plane substantially parallel to the axis of the bell-shaped portion.

Abstract: An engine-transaxle-belt drive configuration is provided for a lawn and garden rear engine vehicle. The transaxle housing has been adapted to receive the engine drive pulley and electric clutch in order to lower the engine mounting and vehicle center of gravity. A releasable fastening structure is provided to facilitate clutch movement and removal of the transmission and implement drive belts.

Abstract: A power steering apparatus provided with an electromagnetic clutch disposed between an output shaft of a steering assisting motor and a transmission shaft connected to a steering mechanism, an intermediate transmission shaft supported between the output shaft and transmission shaft and supporting an armature part of the electromagnetic clutch, and a biasing member to bias the intermediate transmission shaft in the axial direction. The intermediate transmission shaft is pressed to the side of the output shaft by the biasing member and a fixed initial gap is formed between a friction plate fixed to the output shaft and another friction plate fixed to the armature part. In addition, this power steering apparatus is provided with a shielding member between a reduction unit and the electromagnetic clutch for shielding these two from each other. Lubricant scattering from the reduction unit is prevented from reaching the electromagnetic clutch owing to the presence of the shielding member.

Abstract: A wiper system for motor vehicles is described in which a pivot-shaft assembly is fixed to the one end of a pipe-like carrier held by way of its other end on a stud of a motor carrier member stable in form. Wiper systems of this kind can also be produced at low costs for motor vehicles in which the assembly conditions are difficult.

Abstract: In a transmission assembly comprising a transmission casing (11) disposed between left and right rear wheels (13) and a hydrostatic transmission (16) supported by a plate member (15) secured to a front of the transmission casing, an axial plunger-type hydraulic pump (17) of the hydrostatic transmission is mounted on a rear of an upper portion of the plate member and is disposed within the transmission casing. One of the side walls (11a) of the transmission casing includes an opening (24) for assembling into the casing not only a transmission mechanism disposed between a laterally extending reduction shaft (20), driven by a motor shaft (18a) of the hydrostatic transmission, and rear wheel axles (12), but a swash plate (23) of the hydraulic pump. A side cover (25) which closes the opening is used for supporting the transmission mechanism and swash plate so as to permit to assemble the swash plate into the transmission casing together with the transmission mechanism.

Abstract: To accommodate differential thermal growth of a component and its support, a pair of temperature responsive mounts are provided. Each mount comprises a rigid, bowed beam having lugs at each end affixed to the component and an intermediate lug affixed to the case. Thermal expansions of the beams and the component load the beams in compression, causing flexures thereof in directions to produce motions of the third lugs that track the thermal growth of the support.

Abstract: The invented interconnect casing includes first and second flanges, a spacer associated with and intermediate the first and second flanges, an aperture in the spacer, and a bracket arm attached to one of the flanges for supporting a driven device. The invented power divider includes an engine having a drive shaft, a first flange mounted to the engine adjacent the drive shaft, a second flange mounted to a first device, a spacer that is associated with and intermediate the first and second flanges, an aperture in the spacer allowing access to the drive shaft, and a bracket arm attached to and extending from one of the flanges for supporting a second device.

Abstract: This invention relates to automatic transmissions and more particularly to valves for controlling and limiting automatic transmission breathing to reduce oxidation of the operating fluid fill. The valve permits relief of any residual pressure within the transmission housing for checking the operating fluid level.

Abstract: A hydraulic breather for a valve body in an automatic transmission, in which is disposed hydraulic equipment, for example, linear solenoid valves. The breather separates oil in the oil pan from the oil in the hydraulilc equipment when the automatic transmission is at work while allowing clean oil from the oil pan to enter the hydraulic equipment when the automatic transmission is at rest. The breating hole is provided in the form of an oil passage extending from hydraulic equipment within the valve body and includes an open-end section disposed in an upper part of the valve body. The open-end is located at a point higher than the working oil level in the automatic transmission. When the automatic transmission is at work, oil in the oil pan is used to lubricate, so the oil level is at its lowest level and the open-end section is above that oil level and thereby connects with air space in the valve body.

Abstract: A transmission includes a transmission casing, a speed reducer mechanism housed in the transmission casing, a hydrostatic power unit mounted on the transmission casing, the hydrostatic power unit comprising a pump having a pump shaft and a motor having a motor shaft, the pump shaft and the motor shaft extending parallel to each other, and an input shaft operatively coupled to the pump shaft. The transmission casing has an interior space divided into a first chamber in which the input shaft is disposed and a second chamber in which the speed reducer mechanism is accommodated.

Abstract: A noise muffling assembly, particularly for use with toothed wheel gear units having a partitioned housing (1), within which moving machine elements (2) are positioned, the shafts (3, 4) of which are supported in the housing, whereby only one housing part (6) is, by the attachment bases (7, 7'), attached to a base (8). At least the housing part (6) which is connected by the attachment base (7, 7') to the base (8) supports the shafts (3, 4) and includes, between its shafts (3, 4) and the attachment bases (7, 7'), a plurality of separation points (10, 10') lying at a distance from one another in such a manner that a long sound route (S) results. The separation points (10, 10') each consist of noise muffling elements (11, 12) which are constructed independently of one another, and are joined together by connecting parts (19, 20, 21) and whereby the noise muffling element (12) lying at the greatest distance from the housing (1), has the attachment bases (7, 7').

Abstract: A gear box for storing gears of a swinging controller of an air fan in the gear box includes an upper cover fixed on the gear box and integrally formed by plastic molding process to form two screw holes in situ in the upper cover for saving a manual drilling and tapping operation so that an outer housing may be secured on the gear box by a screw inserted into one of the two screw holes formed in the upper cover for encasing the gear box and a fan motor inside the housing.

Abstract: In a transmission case section for an automatic transaxle case, a center axis of a governor receiving portion is arranged between a center axis of a main power train and a center axis of a reduction gear when viewed in plane perpendicular to the center axis of the main power train and the center axis of the final drive gear. A nearly right-angled triangular reinforcement is formed in a corner between a main power train receiving portion and differential side cover portion. The governor receiving portion is formed so as to extend through the reinforcement.

Abstract: A resilient sealing device is provided for accommodating tolerance variations between a lubricant holding case and a hub member. The device has a sealing face including deformable lips which are urged toward the hub by a resilient column and deformable legs held in a retaining channel, with both the column and the legs allowing the lips to recede back into the channel while the edges of the sealing face are held by the edges of the channel.

Abstract: To reduce as much as possible the extension of a vehicle transmisson due to the cantilever fitting of an electric retarder with two rotor discs and two rotor rings on the casing of the gearbox of this transmission, between the gearbox flange and the journal cross of the nearest cardan joint a single tubular insert is provided bearing the two rings externally and pierced radially with two bores forming bearings for two journals of the journal cross with interpositioning of bushings and by two apertures adapted to let pass bushings associated with the other two journals of the journal cross for pivotally mounting same on the fork of the cardan joint.

Abstract: A vehicle door has a window regulator carried by a panel and a motor drive unit with a drive gear projecting from an opening in a housing and adapted to drive the window regulator. A cover is provided for attachement on the housing to close the opening. The cover has a plurality of spaced apart first tangs which engage the housing to effect attachment of the cover on the housing. The cover also has a plurality of spaced apart second tangs which project away from the housing. A plurality of openings are provided in the panel to register with the plurality of second tangs and receive the second tangs in snap fitting engagement with the openings so that the motor drive unit is attached to the door panel. The first tangs may be attached to the housing by either staking the housing to the tangs or by the tangs having a snap fitting engagement with the housing.

Abstract: An oil-sealing structure of a motor including a bearing supporting a motor shaft, and an oil seal provided in the space between the motor shaft and a bracket and positioned close to one end of the motor shaft while separated by a predetermined distance from the bearing. An outer peripheral surface of the motor shaft faces, within the space, an inner peripheral surface of the bracket. Steps are formed on the motor-shaft outer peripheral surface and positioned between the bearing and the oil seal, with their diameter increasing in a stepped manner toward the bearing. A stepped groove is formed on the bracket inner peripheral surface and positioned between the bearing and the oil seal, with its diameter decreasing in a stepped manner toward the bearing. An oil outlet is also formed on the bracket inner peripheral surface for discharging oil which has penetrated beyond the oil seal. The structure is capable of highly secure prevention of oil penetration into the motor.

Abstract: A transmission case has a wall portion defining an oil pressure chamber of a fluid operated friction device, and an end portion having a threaded hole receiving a bolt for fastening a side cover to the case. In order to make the wall portion impervious to oil notwithstanding defects formed by casting, the wall portion is separated from the end portion by a U-shaped groove. Furthermore, the end portion is shaped into an outward flange through which the threaded hole passes from one side to the other.

Abstract: Method for lubricating vehicle gears, characterized in that the lubricating oil is injected directly into the areas to be lubricated by means of a plurality of injection elements (43) and the consumed oil is returned to said injection elements by means of a closed circuit (35, 37, 40, 43, 45, 47, 49), where defoaming and preparation takes place.

Abstract: A motor case end plate structure, comprising: a motor case accommodating a motor unit therein and provided with a first radial bearing for a rotor shaft of the motor unit; a radial flange provided at an open end of the motor case; and an end plate, made of molded synthetic resin, having a second radial bearing for the rotor shaft and adapted to be attached to the motor case by way of the flange; the end plate being provided with at least three separate peripheral mounting surfaces disposed around the rotor shaft and projecting from surrounding parts so as to substantially directly abut an outer end surface of the flange of the motor case. Thereby, any error in the planeness of the mounting surfaces or any error in their perpendicularity with respect to the axial line of the motor unit can be readily corrected by shaping the part of the die for molding the end plate corresponding to the mounting surface to be corrected without requiring excessive cost or time.

Abstract: A gear shift transmission for a motor vehicle has a transmission housing which comprises an axle housing, an intermediate plate and a housing bell. The input shaft and the output shaft of the gear shift transmission are supported in three places, specifically in a front bearing plate of the axle housing, in the intermediate plate, and in a rear bearing plate of the housing bell. The reverse gear and the lower forward gears are arranged in the axle housing, and the higher forward gears are arranged in the housing bell.

Abstract: A joining structure of an automotive vehicle power plant including a transmission and a torque converter. The housing of the transmission is integrally formed with a generally annular flange which is joined with a generally annular flange of the casing of the torque converter by fastening bolts so that the joining surfaces of the transmission housing and the torque converter casing are in tight contact with each other. Each fastening bolt is disposed through the bolt holes which are respectively formed in the flanges of the transmission housing and the torque converter casing. A plurality of depressions are formed at the joining surface of the transmission housing flange in such a manner that each bolt hole merges in the depression, so that projected and depressed parts are formed in the joining surface. The projected part is in contact with the joining surface of the torque converter casing flange.

Abstract: A gear reducer kit has one shaft mounted in a rotatable quill which rotates along an axis offset from the shaft axis. The quill may be fixed with respect to the gear reducer at one of several discrete index position, each associated with a different input pinion gear corresponding to the distance between the shaft and an idler gear. A flange rim guides the rotation of the quill mode with respect to the housing. The idler gear is opposed to the mounting base of the gear reducer with respect to the shaft to permit spacing plates to be added to adjust the mounting spacing.

Abstract: A pump arrangement for a transmission in which an integrated pump rotates with a common drive shaft (6) having a free end, supported via a shaft bearing (8), carrying a connection part (12) for accommodating a power take off shaft (14), the connection part is provided with a spline or wedge arrangement for driving both the power take off shaft (14), when attached thereto, and a pump rotor (16) of the integrated pump, a pump stator (3) is snugly positioned in a housing wall opening (2) and is provided with a bearing neck (7) supporting the shaft bearing (8), a fed inlet and a discharge outlet for the pump stator are provided in a housing wall (1) and a housing cover (19), which has a central opening (21) accommodating the connection part (12), covers a face of the pump stator adjacent the take off side.

Abstract: A gear mechanism has a plurality of gears provided on a shaft and is housed in a housing. Oil is filled into a lower part of the housing. The bottom of the housing is raised to conform to the contour of the gears and an oil return passage in the form of a groove extending in the direction of the row of the gears is formed in the bottom surface of the housing.

Abstract: A check valve and an orifice are situated in a feeder oil passage to an accumulator so that influence of drained oil from the accumulator is eliminated when a hydraulic servo is drained. The hydraulic pressure is supplied to the servo through the orifice, and to the accumulator with the feeder oil passage separate from the oil passage to the hydraulic servo with the check valve being opened. When draining, the hydraulic pressure in the hydraulic servo is drained quickly, however, the hydraulic pressure in the accumulator is drained gradually because the check valve is closed.

Abstract: A transmission includes a case having first and second case portions, an oil pump supported on the first case portion and a valve body supported on the second case portion. The valve body regulates the pressure of the oil discharged by the oil pump. The oil pump is provided with a pump manifold, and the manifold includes a filter which filters oil stored in an oil pan beneath the transmission. An oil intake passage is provided in the pump manifold, a starting end of the oil intake passage communicating with the oil pan, and a terminating end of the oil intake passage communicating with the oil pump through the filter. The pump manifold also includes an oil feed passage for feeding oil from the oil pump to the valve body, and an oil return passage for returning clean surplus oil from the valve body into the oil intake passage downstream of the filter.

Abstract: An automatic power transmission includes a primary transmission unit having plurality of gear elements for establishing predetermined speed ratios and a subsidiary transmission unit having an under-drive gear element for establishing at least one and a direct drive. Each gear element is associated with a friction element which controls associated one of the gear element for establishing one of a plurality of predetermined speed ratios. The friction element is connected to a hydraulic circuit which controls position of the friction element between engaged position and released position for establishing the one of speed ratios.

Abstract: A power plant structure for four wheel drive cars includes an engine part, a clutch part, a transmission part and a transfer part. The clutch part comprises a clutch which is received in a clutch housing. The clutch is coaxially connected to the engine. The transmission part comprises a transmission which is received in a transmission case. The transfer part comprises a transfer and differentials which are received in a transfer case. In order to increase the rigidity of the power plant, the following measures are taken. The transmission part and the transfer part are arranged in parallel with and beside the engine part and the clutch part. The transfer part is located below the transmission part. The clutch housing, the transmission case and the transfer case constitute a monolithic housing construction which is secured to the engine part.

Abstract: An output shaft is supported by means of a ball bearing at one end, a radial needle bearing and a thrust bearing. The ball bearing is arranged for supporting the output shaft against most part of radial load. On the other hand, the trust bearing is arranged for supporting the output shaft against the thrusting force which is exerted on the output shaft while the engine driving torque is transferred therethrough. Such construction reduces radial and thrusting stress to be exerted on the needle bearing. Therefore, the radial needle bearing to be used in the shown construction is required substantially small load capacity and thus can be satisfactorily small for allowing the transaxle unit to be designed compact.

Abstract: A coaxial engine starter comprising a d.c. electric motor (11), a planetary speed reduction gear unit (20), a unidirectional clutch and a pinion. The planetary gear unit (20) includes a large-diameter inner gear member (17) mounted to the front end of the motor housing (11a). The clutch and the pinion are housed within a front machine frame (21) attached to the inner gear member. The inner gear member (17) is securely held in place between the motor housing (11a) and the front machine frame (21) by U-shaped connectors (22) and through bolts (23) fastening the front machine frame (21), the inner gear member (17) and the motor housing (11a) together. Alternatively, the inner gear member (27; 37) including gear teeth (27a; 38a) may be directly thread-engaged by the through bolts (32) positioned radially inward of the inner gear teeth (27a; 38a) and the front machine frame (29) may be attached to the inner gear member (27; 37).

Abstract: A shroud (20) for a gear train (12) disposed within a gear case (22) includes a plurality of meshing gears (14), each gear (14) having sides (14a, 14b), teeth (16) and an outer diameter (14c). The shroud (20) encircles the outer diameter (14c) of each gear (14) within the gear train (12) and for enclosing the sides (14a, 14b) adjacent to the outer diameter (14c) of each gear (14) within the gear train (12). The shroud (20) includes a pair of side walls (20a, 20b) and an end wall (20c). The walls (20a, 20b, 20c) enclosed the teeth (16) of each of the gears (14) within the gear train (12) for substantially minimizing cooling fluid present within the gear case (22) from contacting the gear train (12).

Abstract: A drive system for a tracked vehicle includes an engine carried in an engine housing and a transmission carried in a transmission housing. The axes of rotation of an engine output shaft, a drive transmission input and drive transmission output shaft are parallel to each other. Drivingly interconnecting the engine output shaft and the transmission input is a transfer gear carried in a transfer housing. The transfer housing is rigidly connected to the engine housing and drivingly engages the transmission input through a rotational coupling which permits radial and skew angular offsets between an axis of rotation of the transfer gear output and the axis of rotation of the transmission input to accommodate dimensional variation in the drive system components from ideal specified dimensions without stress.

Abstract: In an automatic transaxle having an idler gear center axis below a line interconnecting a main power train center axis and a differential center axis, a control valve assembly is disposed on one of opposite sides of a transaxle case divided by the idler gear center axis. The differential is disposed on the other of the opposite sides of the transaxle. An oil storing chamber is disposed next to the control valve assembly and free from occupation by same. The oil storing chamber extends from one to the other of the opposite sides of the transaxle case.

Abstract: An engine having a crank case splitted into upper and lower crank cases, and including a crank shaft and a transmission drive shaft disposed on the split plane between the upper crank case and the lower crank case and a transmission main shaft carried by either one of the upper or lower crank case. The length and the size of the engine can be reduced by the arrangement according to the invention, and a starter motor, a transmission drum and balancers can be arranged efficiently to save space required for mounting the engine.