Abstract: A differential apparatus (7) comprises: a differential casting (21) rotated by an engine power; a plurality of pinion gears (65, 66) slidably housed in accommodation holes (63, 64) formed in the differential casing; a pair of side gears (35, 37) geared with each other via the pinion gears, two opposing end surfaces thereof being slid relative to each other, either directly or via a thrust washer (61); and a block member (47, 91, 97) interposed between two inner circumferential surfaces of the two side gears so as to center the side gears, respectively. In particular, at least one oil sump (77,) is formed between the block member and the side gears, to supply lubricant to sliding portions between the bolck member (47, 91, 97) and the side gears (35, 37) and between two opposing end surfaces of the two side gears, by a centrifugal force generated by the rotating differential casing.

Abstract: A switching synchronous apparatus for a four wheel drive vehicle in which a drive force is transmitted to a driven side differential gear by connecting the drive force of a transfer capable of attaching and detaching the drive force is disclosed. The apparatus comprising a first rotation member provided in the driven side differential gear and connected to a transfer side, a second rotation member provided in the driven side differential gear and to be connected to the first rotation member, and a synchronous connection mechanism provided in the driven side differential gear and synchronously connecting the first rotation member to the second rotation member in relative. Here, the first rotation member and the second rotation member are synchronously connected to each other by the synchronously connecting mechanism and the drive force becomes in a state capable of being transmitted to the second rotation member.

Abstract: A differential apparatus includes a differential casing, a pair of output side gears disposed in the differential casing, a differential mechanism distributing driving force of an engine, a clutch for operatively connecting the differential casing with the axles of the vehicle, an actuator for releasing the clutch from its connecting operation, and an urging member for causing the clutch to connect the differential casing with the axles of the vehicle. When the actuator is inactivated, the urging member serves to attain the connecting operation of the clutch. Therefore, even if the actuator is in a bad condition, four-wheel driving condition of the vehicle can be maintained. Therefore, the differential apparatus allows the vehicle to escape from a bad road.

Abstract: A fastening structure has a screw rotor fixing a rotor shaft to a shaft hole of a rotor body. A casing includes the rotor therein, and a positioning portion and a screw portion are arranged between the shaft hole and the rotor shaft. Press fit portions are arranged at both axial ends of the shaft hole. The screw portion receives driving torque inputted to the rotor shaft and moves the rotor body so that the shaft hole and the rotor shaft hit against each other in the positioning portion. Accordingly, a fixing function of the rotor body and the rotor shaft is strengthened as the input torque to the rotor is increased. Further, the rotor has a simple structure and is cheaply manufactured. Furthermore, it is possible to prevent reductions in performance and durability of the rotor caused by any shift in position between the rotor body and the rotor shaft.

Abstract: A differential mechanism has a differential casing for receiving drive power from an engine and a pair of output members for distributing the received drive power to road wheel ends. A pair of drive power control mechanisms each respectively comprise a combination of a speed change mechanism and a friction clutch for a serial connection between the differential casing and either output member or between the output members and an actuator for actuating the friction clutch to be let in. A controller controls a pair of the actuators to have a pair of the friction clutches periodically let in and let out in an alternating manner with a relatively short period.

Abstract: A differential apparatus comprises: a differential gear (1) rotatably housed in a left end within a carrier case (3); a speed increasing mechanism and reducing mechanism (31) housed within the carrier case (3) in such a manner as to be adjacent to the rear differential apparatus (1), having a speed increasing mechanism (37) for increasing a rotational speed and a speed reducing mechanism (39) for reducing the rotational speed of the input gear (33) connected to a differential case (11) in a parallel manner; a speed increasing and reducing clutches (53) mounted to the carrier case (3) and for connecting and disconnecting the rotation from the input gear (33) which are arranged in a plane crossing to axes of output shafts (21,23) in parallel.

Abstract: A differential apparatus for a part-time four-wheel drive vehicle is provided. The differential apparatus includes an outer differential casing, an inner differential casing, a clutch member adjacent to the inner differential casing, a pair of dog clutches, a differential gear system arranged in the inner differential casing and an actuator body for actuating the clutch member. One of the dog clutches is connected with the inner differential casing, while the other of the dog clutches is formed on the clutch member. When the vehicle is traveling under two-wheel drive, the inner differential casing and the differential gear system are raced, while the outer differential casing and the clutch member do not race. Accordingly, it is possible to reduce the racing loss of these members and the noise caused by the racing loss.

Abstract: A differential apparatus (7) comprises: a differential casing (21) rotated by an engine power; a plurality of pinion gears (65, 66) slidably housed in accommodation holes (63, 64) formed in the differential casing: a pair of side gears (35, 37) geared with each other via the pinion gears, two opposing end surfaces thereof being slid relative each other, either directly or via a thrust washer (61); and a block member (47, 91, 97) interposed between two inner circumferential surfaces of the two side gears so as to center the side gears, respectively. In particular, at least one oil sump (77, 79; 95; 101) is formed between the block member and the side gears, to supply lubricant to sliding portions between the block member (47, 91, 97) and the side gears (35, 37) and between two opposing end surfaces of the two side gears, by a centrifugal force generated by the rotating differential casing.

Abstract: A transmission for an auxiliary device arranged for transmitting a driving force of an engine to an auxiliary device has a planetary-gear-type speed increasing mechanism having a first gear driven by the engine through an input shaft, a second gear connected to the auxiliary device and a third gear for locking. It is further provided with a friction clutch for connecting the third gear to a stationary member, a hydraulic actuator for pressing the friction clutch and an oil pump for feeding an oil pressure to the hydraulic actuator. A damper is disposed between the stationary member and the friction clutch.

Abstract: A differential apparatus includes a differential casing, a pair of side gears and plural pairs of pinion gears. The pinion gears are accommodated in bores formed in the differential casing, respectively. Each pinion gear has an outer diameter smaller than that of a standard gear to be determined corresponding to predetermined gear specifications. With such a forming of the pinion gears, the tip circular thickness of each pinion gear is increased, so that surface pressure at respective tips of the pinion gears is reduced to improve the seizure resistant capability.

Abstract: A differential apparatus has a differential casing, a pinion gear, a pair of side gears engaged with the pinion gear, and a cone clutch for limiting a differential movement between the side gears. In this differential apparatus, the cone clutch is constructed by a female side cone portion formed in an inner circumference of the differential casing, and a male side cone portion formed in an outer circumference of the pair of side gears. The female side cone portion is formed in the shape of a tapered face in which a conical generating line is a straight line. The male side cone portion is formed in the shape of a tapered face having a predetermined curvature and a generating line projecting to the female side cone portion. Thus, no sliding portion is offset to a small diameter portion even when thrust applied to the cone clutch is increased, thereby improving durability of the cone clutch.

Abstract: A differential gear transmitting force from an engine to a pair of wheels, includes a differential gear case receiving driving force of an engine and rotatably driven having a casing body and an end cover, a pair of side gears connected with the wheels respectively, pinion gears having a first gear portion meshed with the side gear and a second gear portion meshed with other pinion gear outside in the axial direction of the side gears, housing holes receiving each pinion gear slidably and rotatably and supporting a whole periphery of the second gear portion of the pinion gear except for a meshing portion meshed with other pinion gear, and a plate member fixed to the casing body and being able to bear the thrust force of the pinion gear.

Abstract: A differential apparatus comprises: a casing (1) rotated by an external power; a first shaft (9) rotatably supported by the casing: a second shaft (11) rotatably supported by the casing; a first side gear (17) formed integral with the first shaft: a second side gear (19) formed integral with the second shaft; and a helical pinion gear assembly (29. 31) geared between the first and second side gears within the casing filled with a viscous fluid. Therefore, a differential limiting force can be generated by gearing between the helical pinion gear assembly and tire first and second side gears, when the viscous fluid is pressurized and circulated within the casing by a gear pumping action of the helical pinion gear assembly caused by differential motion between the first and second side gears, even if the torque applied to one of the side gears is zero (as when one tire is floated perfectly from a road surface).

Abstract: A differential device for a four wheel drive vehicle. The differential device has a differential gear mechanism which distributes driving force of an engine inputted through a differential case to a pair of side gears which in turn drive a pair of output shafts. A sleeve is connected to one of the output shafts and a movable member is movably connected to the sleeve. A dog clutch is formed between a flange member of a side gear and the movable member. A return spring urges the movable member towards a release position of the clutch. An actuator is provided for moving the movable member towards engagement of the dog clutch. The sleeve, the dog clutch, and the return spring are located together in the differential case.

Abstract: A differential apparatus includes a differential casing, a pair of output side gears, a pair of output shafts connected to the output side gears, four pairs of long and short accommodating bores formed in the differential casing and long and short pinion gears accommodated in the accommodating bores. In arrangement, these pairs of accommodating bores are divided equally in the circumferential direction of the differential casing. The output shafts are prevented from slipping out of the differential casing by C-shaped clips. These accommodating bores are arranged so that, between two neighboring pairs of accommodating bores in the circumferential direction, the short accommodating bore in the one pair adjoins the short accommodating bore of the other pair. The differential casing is provided with an elongated hole which substantially bridges the adjoining short accommodating bores.

Abstract: A cast screw rotor has an opened lightening or reduced weight hole formed inside each thread portion. The opened hole is formed along torsion of the thread portion, and a shaft is inserted into an axial hole. The screw rotor is manufactured by a method in which each of the thread portions and the axial hole are formed on the basis of the reduced weight hole.

Abstract: An object of the present invention is to provide a rotor of a fluid machine in which the rotor can be made light in weight and moment of inertia of the rotor can be reduced and the rotor can be easily balanced in its rotating direction. In this rotor of a fluid machine, a fluid is compressed and pumped by a pair of rotors engaged with each other. A hollow portion is formed within a tooth stripe portion of one rotor. A thickness forming portion for a balance correction is formed in an opening portion of this hollow portion to balance the rotor in its rotating direction and is projected on an inner circumferential side of the hollow portion.

Abstract: There are provided male and female rotors, which engage with each other at screw-shaped tooth trace portions formed on the rotor bodies; a compressor casing which houses these rotors and has a suction port on one side in the axial direction and a discharge port on the other side in the axial direction; hollow portions which are provided in the tooth trace portions of the male screw rotor and communicate with the suction port; and partition walls which are provided at the end on the discharge port side of the tooth trace portions and block the hollow portions.

Abstract: A differential unit is disclosed which has a differential limiting function and which exhibits stable differential limiting characteristic even if the difference in the differential rotations is small. The differential unit has a differential case, pinion gears, side gears, a gear pump disposed between a left side gear and the differential case.

Abstract: To enable a reliable differential lock without setting an actuator to be large-sized, a differential apparatus has a differential casing rotated by driving force of an engine, output side helical side gears supported within this differential casing, helical pinion gears connecting the gears, storage holes for storing the gears slidably and rotatably, a locked member connected to the gear, a lock member integrally rotated with the differential casing, a clutch mechanism formed between the members and locking a differential rotation, an actuator for coupling and operating the clutch mechanism, and a cam mechanism for increasing coupling force of the clutch mechanism by receiving differential torque when the clutch mechanism is coupled.