Hybrid drive device

Abstract

The present invention relates to a hybrid drive device including a first shaft coupled to an internal combustion engine, a rotary electric machine, a second shaft disposed coaxially with the first shaft and coupled to the rotary electric machine and a speed change mechanism, a clutch is provided to switch on and off transfer of a drive force between the first shaft and the second shaft, and a case houses the first shaft, the second shaft, the rotary electric machine, and the clutch. A rotor of the rotary electric machine is fixed to an outer peripheral portion of the clutch housing. A first seal mechanism is disposed in contact with an outer peripheral surface of the large diameter portion of the second axially projecting portion and the inner peripheral surface of the first axially projecting portion, and side by side with the first support mechanism in the axial direction.

1 . A hybrid drive device comprising:
 a first shaft drivably coupled to an internal combustion engine;   a rotary electric machine;   a second shaft disposed coaxially with the first shaft and drivably coupled to the rotary electric machine and a speed change mechanism;   a clutch provided to switch on and off transfer of a drive force between the first shaft and the second shaft;   a case that houses the first shaft, the second shaft, the rotary electric machine, and the clutch;   a clutch housing which houses the clutch by covering both sides of the clutch in an axial direction and an outer side of the clutch in a radial direction, which is drivably coupled to the second shaft, and inside which an oil chamber filled with oil is formed; and   a first support mechanism that supports the clutch housing in the radial direction and the axial direction so as to be rotatable with respect to the case, and a first seal mechanism that oil-tightly seals an area between the case and the clutch housing, the first support mechanism and the first seal mechanism being provided on one side in the axial direction with respect to the clutch housing, wherein   a rotor of the rotary electric machine is fixed to an outer peripheral portion of the clutch housing,   the case includes a one-side support wall portion provided on one side in the axial direction with respect to the clutch housing to extend radially, and a cylindrical first axially projecting portion projecting from the one-side support wall portion toward the other side in the axial direction,   the clutch housing includes a one-side radially extending portion disposed on one side in the axial direction with respect to the clutch to extend radially, and a cylindrical second axially projecting portion projecting from the one-side radially extending portion toward one side in the axial direction,   the second axially projecting portion is formed in a stepped shape in which a large diameter portion is formed on the other side in the axial direction and a small diameter portion is formed on one side in the axial direction,   the first support mechanism is disposed in contact with an outer peripheral surface of the small diameter portion of the second axially projecting portion and an inner peripheral surface of the first axially projecting portion, and   the first seal mechanism is disposed in contact with an outer peripheral surface of the large diameter portion of the second axially projecting portion and the inner peripheral surface of the first axially projecting portion, and side by side with the first support mechanism in the axial direction.   
     
     
         2 . The hybrid drive device according to  claim 1 , wherein
 the one-side radially extending portion is formed in a shape in which a radially inner end portion is positioned on the other side in the axial direction with respect to a radially outer end portion, and   one or both of the first support mechanism and the first seal mechanism are disposed to overlap the one-side radially extending portion in the axial direction.   
     
     
         3 . The hybrid drive device according to  claim 1 , further comprising a second support mechanism that supports the clutch housing in the radial direction and the axial direction so as to be rotatable with respect to the case, and a second seal mechanism that oil-tightly seals an area between the case and the clutch housing, the second support mechanism and the second seal mechanism being provided on the other side in the axial direction with respect to the clutch housing, wherein
 the case includes an other-side support wall portion provided on the other side in the axial direction with respect to the clutch housing to extend radially, and a cylindrical third axially projecting portion projecting from the other-side support wall portion toward one side in the axial direction,   the clutch housing includes an other-side radially extending portion disposed on the other side in the axial direction with respect to the clutch to extend radially, and a cylindrical fourth axially projecting portion projecting from the other-side radially extending portion toward the other side in the axial direction,   the fourth axially projecting portion is formed in a stepped shape in which a large diameter portion is formed on one side in the axial direction and a small diameter portion is formed on the other side in the axial direction,   the second support mechanism is disposed in contact with an outer peripheral surface of the small diameter portion of the fourth axially projecting portion and an inner peripheral surface of the third axially projecting portion, and   the second seal mechanism is disposed in contact with an outer peripheral surface of the large diameter portion of the fourth axially projecting portion and the inner peripheral surface of the third axially projecting portion, and side by side with the second support mechanism in the axial direction.   
     
     
         4 . The hybrid drive device according to  claim 3 , wherein
 the other-side radially extending portion is formed in a shape in which a radially inner end portion is positioned on one side in the axial direction with respect to a radially outer end portion, and   one or both of the second support mechanism and the second seal mechanism are disposed to overlap the other-side radially extending portion in the axial direction.   
     
     
         5 . The hybrid drive device according to  claim 1 , further comprising a second support mechanism that supports the clutch housing in the radial direction and the axial direction so as to be rotatable with respect to the case, and a second seal mechanism that oil-tightly seals an area between the case and the clutch housing, the second support mechanism and the second seal mechanism being provided on the other side in the axial direction with respect to the clutch housing, wherein
 the case includes an other-side support wall portion provided on the other side in the axial direction with respect to the clutch housing to extend radially, and a cylindrical third axially projecting portion projecting from the other-side support wall portion toward one side in the axial direction,   the clutch housing includes an other-side radially extending portion disposed on the other side in the axial direction with respect to the clutch to extend radially, and a cylindrical fourth axially projecting portion projecting from the other-side radially extending portion toward the other side in the axial direction,   the other-side radially extending portion includes a first circular plate portion provided with the fourth axially projecting portion, a second circular plate portion disposed radially outwardly of the first circular plate portion and offset on the other side in the axial direction with respect to the first circular plate portion, and a stepped cylindrical portion formed to couple the first circular plate portion and the second circular plate portion to each other,   the second support mechanism is disposed in contact with an outer peripheral surface of the fourth axially projecting portion and an inner peripheral surface of the third axially projecting portion, and   the second seal mechanism is disposed in contact with an outer peripheral surface of the third axially projecting portion and an inner peripheral surface of the stepped cylindrical portion to overlap the second support mechanism in the axial direction.   
     
     
         6 . The hybrid drive device according to  claim 3 , wherein
 a plurality of friction plates provided in the clutch are disposed radially outwardly of the first seal mechanism and the second seal mechanism.   
     
     
         7 . The hybrid drive device according to  claim 6 , wherein
 the clutch includes a piston that presses the plurality of friction plates, and   the second seal mechanism is disposed to overlap the piston in the axial direction.   
     
     
         8 . The hybrid drive device according to  claim 1 , further comprising a coupling member extending radially to couple the first shaft and a clutch hub of the clutch to each other, and a third support mechanism and a fourth support mechanism disposed in contact with a surface of the coupling member on one side in the axial direction and a surface of the coupling member on the other side in the axial direction, respectively, to support the coupling member and the clutch housing so as to be relatively rotatable with respect to each other, wherein
 the coupling member includes a shaft-side coupling portion extending radially outward from the first shaft, and a hub-side coupling portion forming a part of the clutch hub and extending radially inward,   the hub-side coupling portion is coupled to the shaft-side coupling portion with the hub-side coupling portion in contact with a notched groove formed in a radially outer end portion of the shaft-side coupling portion from one side in the axial direction,   the one-side radially extending portion includes a cylindrical axially retracted surface formed to be continuous from a surface of the one-side radially extending portion on the other side in the axial direction and to be retracted toward one side in the axial direction,   the third support mechanism is positioned in the radial direction by the axially retracted surface, and   the fourth support mechanism is disposed radially outwardly of the third support mechanism, and positioned in the radial direction by a radially outer end of the shaft-side coupling portion.   
     
     
         9 . The hybrid drive device according to  claim 1 , further comprising a damper device disposed on one side in the axial direction with respect to the one-side support wall portion and interposed between the first shaft and the internal combustion engine, wherein
 the damper device is disposed to overlap in the axial direction a coil end portion projecting in the axial direction from a stator of the rotary electric machine.   
     
     
         10 . The hybrid drive device according to  claim 5 , wherein
 a plurality of friction plates provided in the clutch are disposed radially outwardly of the first seal mechanism and the second seal mechanism.   
     
     
         11 . The hybrid drive device according to  claim 10 , wherein
 the clutch includes a piston that presses the plurality of friction plates, and   the second seal mechanism is disposed to overlap the piston in the axial direction.