Pressures of left and right clutch pistons (55, 63) applied to left and right disk portions (42b, 42d) of a common clutch outer (42) of left and right clutches (29, 30) distributing drive force of an input shaft (20) to left and right output shafts (23, 24) are, finally, transmitted to and supported
Pressures of left and right clutch pistons (55, 63) applied to left and right disk portions (42b, 42d) of a common clutch outer (42) of left and right clutches (29, 30) distributing drive force of an input shaft (20) to left and right output shafts (23, 24) are, finally, transmitted to and supported by a side housing (12) through a boss portion (42a) of the clutch outer (42) and a thrust bearing (53, 52, 48; 41, 27). Accordingly, the left and right clutches (29, 30) can be engaged with no problem. Even when the pressures of the clutch pistons (55, 63) deform the left and right disk portions (42b, 42d) of the clutch outer (42), the gap (α) formed therebetween prevents the transmission of the pressure of one of the clutches (29, 30) to the other clutch (29, 30). Accordingly, the interference between the operations of the left and right clutches (29, 30) is prevented.
대표청구항▼
1. A power transmission device comprising left and right clutches including: left and right output shafts supported on a housing, the left and right output shafts being coaxial and rotatable relative to each other;an input shaft disposed on an outer periphery of one of the left and right output shaf
1. A power transmission device comprising left and right clutches including: left and right output shafts supported on a housing, the left and right output shafts being coaxial and rotatable relative to each other;an input shaft disposed on an outer periphery of one of the left and right output shafts in such a way as to be rotatable relative thereto;a clutch outer coupled to the input shaft;left and right clutch inners coupled to the left and right output shafts, respectively;a plurality of left frictional engagement members disposed between the clutch outer and the left clutch inner;a plurality of right frictional engagement members (62) disposed between the clutch outer and the right clutch inner;a left clutch piston configured to press the left frictional engagement members toward the right frictional engagement members; anda right clutch piston configured to press the right frictional engagement members toward the left frictional engagement members,wherein the clutch outer includes a boss portion positioned in an axial direction between the left and right clutch inners through a thrust bearing,left and right disk portions branching in two ways from the boss portion so as to support pressures of the left and right clutch pistons transmitted through the left and right frictional engagement members, respectively, andleft and right drum portions extending in the axial direction from the left and right disk portions so as to guide outer peripheral portions of the left and right frictional engagement members, respectively, anda gap is formed between the left and right disk portions, radially outside of the boss portion. 2. The power transmission device according to claim 1, further comprising a lubrication oil pump in which a pump rotor supported on the input shaft is housed inside a pump case, wherein movement of the oil pump in the axial direction is restricted by use of a stepped portion provided to the input shaft and of a bearing supporting the input shaft on the housing, andwherein movement of the oil pump in a radial direction is restricted by fitting an annular rib, which projects from an inner surface of the housing, to an annular rib, which projects from an outer surface of the pump case. 3. The power transmission device according to claim 2, wherein positioning of the pump case about the input shaft is performed by bringing front and rear ribs projecting from the inner surface of the housing into contact with front and rear surfaces of the pump case which are eccentric from the input shaft. 4. The power transmission device according to any one of claims 1 to 3, wherein oil discharged by the oil pump is supplied as lubrication oil to the left and right clutches through an inside of the input shaft. 5. The power transmission device according to claim 4, wherein an electric oil pump configured to supply hydraulic pressures to the left and right clutches is housed in a pump chamber defined inside the housing and filled with oil,wherein a pump shaft of the electric oil pump is connected to and driven by a rotary shaft of an electric motor, andwherein an air chamber filled with air is defined between the electric motor, which is fixed to an outer portion of the housing, and the pump chamber. 6. The power transmission device according to claim 5, wherein a rotor for detecting a rotational speed of the electric motor is fixed to the rotary shaft penetrating the air chamber.
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이 특허에 인용된 특허 (2)
Rau Jim L. (Lafayette IN) Kinder Mark R. (Lafayette IN), Drive assembly.
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