Patent ID: 6318492
Filing Date: 2001-11-20
Classification: B60K

Abstract:
An integrated wheel end assembly for a vehicle adapted to provide driving engagement/disengagement of a wheel (58) to convert between driven and non-driven modes of wheel movement, the wheel end assembly receiving drive torque from a half shaft (28) through a constant velocity (""CV"") joint (26), said assembly comprising:a knuckle (12) coupled to the vehicle, said knuckle having a hub lock actuator assembly chamber (90) integrally formed therein;a bearing assembly (40) mounted to the knuckle;a cylindrical wheel hub (38) mounted on the bearing assembly for relatively free rotation about a central axis of the hub, said wheel hub having a flange (48) for mounting the wheel at an outboard end thereof and a drive flange (72) at an inboard end thereof, an outer circumference of the drive flange having a plurality of drive flange teeth (78) spaced evenly therearound;a stub shaft (24), an outboard end thereof rotatingly supported in the wheel hub (38) and an inboard end thereof defining a CV housing (82) for the CV joint, the CV housing having a plurality of CV housing teeth (80), the CV housing and flange being positioned axially adjacent to each other;a clutch member (84) having clutch member teeth (86) sized and adapted for engaging the CV housing teeth and the drive flange teeth, the clutch member being slidable axially between a first position in which the clutch member teeth engage only the CV housing teeth and no drive torque is transferred from the half shaft to the wheel hub and a second position in which the clutch member teeth engage both the CV housing teeth and the drive flange teeth and drive torque is transferred from the half shaft to the wheel hub through the engagement, the clutch member being a shift collar (84) having an external circumferential groove; anda hub lock actuator assembly (88) positioned within the hub lock actuator assembly chamber, the hub lock actuator assembly moving the clutch member selectively between the first and second position, the hub lock actuator assembly comprising: an annular groove (90) formed on an inboard face of the knuckle, the groove having a bottom surface (99) and inner and outer side surfaces; and a clutch member actuator (92) communicated to the clutch member, the clutch member actuator having an annular sealing ring (96) affixed thereto, the sealing ring sealingly seated in the annular groove to define a vacuum pocket (100), such that pressure changes in the vacuum pocket cause expansion or contraction of the pocket, resulting in axial movement of the clutch member actuator to selectively shift the clutch member between the respective positions, the communication of the clutch member actuator to the shift collar being achieved through an end (97) of the clutch member actuator being seated in the circumferential groove of the shift collar, with a bushing assembly (95) interposed between the end of the clutch member actuator and the shift collar groove to allow rotation of the shift collar, the clutch member actuator comprising a pair of shift forks (93), each of the shift forks having a radial portion (97), an end of which being the clutch member actuator end seated in the shift collar circumferential groove and an axial portion (98) which extends into the knuckle annular groove and has the sealing ring affixed thereto, an outboard end of the axial portion of each of the pair of shift forks extending into the vacuum pocket and acting as a stop for outboard axial movement of the shift collar by contacting the bottom surface of the knuckle annular groove.