Power transmission device for hybrid vehicle

• US 7,578,363 B2
• Filed: 12/31/2007
• Issued: 08/25/2009
• Est. Priority Date: 09/05/2007
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Kim, Kyung Ha
• Primary Examiner(s): Ellis; Christopher P
• Assistant Examiner(s): AVERY, BRIDGET D
• Application Number:
  US12/006,185
• Publication Number:
  US 20090062052A1
• Time in Patent Office: 603 Days
• Field of Search: 180/65.21, 180/65.25, 180/65.245, 180/65.7, 180/165
• US Class Current: 180/65.25
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/405 Housings
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

The present invention provides a layout of a power transmission device for a hybrid vehicle which provides a high damping force a high damping force against engine fluctuation at low RPM operation by an engine

For this, the preset invention provides a power transmission device for a hybrid vehicle, in which an automatic transmission having an input shaft, a motor, an engine clutch, a flywheel, and an engine having an output shaft connected to a crank shaft of the engine are directly connected to the same axis, the power transmission device including: a motor support shaft, the outer end of which is supported by a motor rotor and the inner end of which extends toward the boundary between the output shaft of the engine and the input shaft of the automatic transmission; a motor housing arranged so as to surround the outer circumference and the left side surface of the motor rotor; a torsion damper disposed between the left side end of the motor housing and the motor rotor; an engine clutch, disposed between the left side end of the motor housing and the left side surface of the inner end of the motor support shaft, for power transmission between the output shaft of the engine and the input shaft of the automatic transmission; a retainer connecting a housing of the engine clutch to the torsion damper; a motor cover housing arranged to cover the right side surface of the motor rotor and the right side surface of the inner end of the motor support shaft and including a concave portion on the right side surface thereof; and a flywheel positioned at the concave portion of the motor cover housing to be blocked from the motor rotor.

Claims

1. A power transmission device for a hybrid vehicle, in which an automatic transmission having an input shaft, a motor, an engine clutch, a flywheel, and an engine having an output shaft connected to a crank shaft of the engine are directly connected to the same axis, the power transmission device comprising:

a motor support shaft, the outer end of which is supported by a motor rotor and the inner end of which extends toward the boundary between the output shaft of the engine and the input shaft of the automatic transmission;

a motor housing arranged to surround the outer circumference and the left side surface of the motor rotor;

a torsion damper disposed between the left side end of the motor housing and the motor rotor;

an engine clutch disposed between the left side end of the motor housing and the left side surface of the inner end of the motor support shaft for providing power transmission between the output shaft of the engine and the input shaft of the automatic transmission;

a retainer connecting a housing of the engine clutch to the torsion damper;

a motor cover housing arranged so as to cover the right side surface of the motor rotor and the right side surface of the inner end of the motor support shaft and including a concave portion on the right side surface thereof; and

a flywheel positioned at the concave portion of the motor cover housing to be blocked from the motor rotor.

2. The power transmission device of claim 1, wherein a support bearing for supporting the rotation of the motor support shaft is mounted between the inner end of the motor support shaft and the inner end of the motor cover housing.

3. The power transmission device of claim 1, wherein a motor position sensor is mounted on the left side surface of the inner end of the motor cover housing, while being adjacent to the right side surface of the motor support shaft.

4. The power transmission device of claim 1, wherein the inner end of the motor support shaft is formed integrally at the center position of the outer end of the motor support shaft engaged with the motor rotor.

5. The power transmission device of claim 1, wherein the flywheel overlaps the outer circumference of the crank shaft and is placed at the concave portion of the motor cover housing.