Hybrid drive device

Abstract

There is provided a first and second bearing supporting a clutch case at first and second axial sides in a radial direction, a rotor of a rotary electrical machine is supported by the clutch case, a gap between an outer peripheral face of a pump drive shaft 10 and an inner peripheral face of a drive shaft insertion hole 90 c is a distribution passage L of oil flowing from a pump chamber 18 a to the first bearing 51 , and a distribution passage diameter difference, which is a difference between a diameter Φa of the outer peripheral face of the pump drive shaft 10 and a diameter Φc of the inner peripheral face of the drive shaft insertion hole 90 c in the distribution passage L, is set so that the distribution passage L functions as a narrowed portion which limits a flow rate of oil.

1 . A hybrid drive apparatus, comprising:
 a first shaft drive-coupled to an internal combustion engine;   a second shaft drive-coupled to a speed change mechanism;   a clutch drive-coupled selectively to the first shaft and the second shaft;   a rotary electrical machine;   a case housing the clutch and the rotary electrical machine;   a clutch case drive-coupled to one of the first shaft and the second shaft and housing the clutch;   an oil pump comprising a pump case fixed to the case and forming a pump chamber inside and a pump rotor arranged rotatably in the pump chamber, the oil pump being arranged coaxially with the clutch case on one axial side with respect to the clutch case;   a first bearing supporting the clutch case at one axial side in a radial direction on the case; and   a second bearing supporting the clutch case at another axial side in the radial direction on the case, wherein   a rotor of the rotary electrical machine is supported by the clutch case,   the first bearing comprises an outer wheel, an inner wheel, and rolling elements intervening between the outer wheel and the inner wheel,   the clutch case comprises a pump drive shaft which extends toward one axial side and is drive-coupled to the pump rotor,   the pump drive shaft is supported on the case via the first bearing and the pump case,   the pump case comprises a partition wall partitioning the first bearing and the pump rotor,   the partition wall comprises a drive shaft insertion hole through which the pump drive shaft is inserted,   a gap between an outer peripheral face of the pump drive shaft and an inner peripheral face of the drive shaft insertion hole is a distribution passage of oil flowing from the pump chamber to the first bearing, and   a distribution passage diameter difference, which is a difference between a diameter of the outer peripheral face of the pump drive shaft and a diameter of the inner peripheral face of the drive shaft insertion hole in the distribution passage, is set so that the distribution passage functions as a narrowed portion which limits a flow rate of oil.   
     
     
         2 . The hybrid drive apparatus according to  claim 1 , wherein
 the distribution passage diameter difference is set larger than a maximum value of an allowance of displacement in the radial direction of the pump drive shaft supported by the first bearing, and   the distribution passage diameter difference is set so that a flow passage sectional area of the distribution passage is smaller than a flow passage sectional area of a pump flow passage which is formed by a gap between the partition wall and the pump rotor and communicates with the distribution passage.   
     
     
         3 . The hybrid drive apparatus according to  claim 1 , wherein
 the pump drive shaft is formed in a stepped shape with one axial side being a small diameter portion and another axial side being a large diameter portion, and is arranged so that the inner peripheral face of the drive shaft insertion hole faces an outer peripheral face of the small diameter portion,   the first bearing is arranged in contact with an outer peripheral face of the large diameter portion,   a difference between a diameter of the large diameter portion and a diameter of the small diameter portion is designated as a pump shaft step width, and   the distribution passage diameter difference is set to a value larger than a maximum value of an allowance of displacement in the radial direction of the pump drive shaft supported by the first bearing and smaller than the pump shaft step width.   
     
     
         4 . The hybrid drive apparatus according to  claim 1 , wherein
 the pump drive shaft comprises a supply oil passage inside that supplies oil to the clutch,   the pump case comprises a section wall which is arranged on the opposite side of the pump rotor from the partition wall in the axial direction and sections one axial side of the pump chamber, and   a section wall side pump flow passage formed by a gap between the section wall and the pump rotor communicates with the supply oil passage.   
     
     
         5 . The hybrid drive apparatus according to  claim 1 , wherein
 the clutch case comprises a one-side radially extending portion arranged on one axial side of the clutch to extend in the radial direction and having a radially inner end portion on which the pump drive shaft is provided, an another-side radially extending portion arranged on another axial side of the clutch to extend in the radial direction, and a cylindrical axially extending portion arranged on a radially outer side of the clutch to extend in the axial direction,   the rotary electrical machine is arranged coaxially with the clutch case and the rotor of the rotary electrical machine is fixed in contact with an outer peripheral face of the axially extending portion,   the another-side radially extending portion and the axially extending portion are formed integrally,   the one-side radially extending portion and the axially extending portion are joined by welding and integrated, and   a joining part by welding is located on a radially outer side with respect to an inner peripheral face of the rotor.