Title:
POWER TRANSMISSION DEVICE FOR FRONT AND REAR WHEEL DRIVE VEHICLE
Document Type and Number:
WIPO Patent Application WO/2010/067413
Kind Code:
A1
Abstract:
A ring gear (CR) of a planetary gear train (24) for distribution constituting a front and rear wheel power distribution unit (14) is coupled to a differential output member (22), a carrier (CCA) thereof is coupled to a rear wheel, a sun gear (CS) thereof is coupled to a front wheel, and an automatic transmission (30) capable of shifting the gear from the speed reducing transmission gear ratio to the speed increasing transmission gear ratio is disposed in a rear-wheel power transmission path. If the gear is shifted to the speed increasing transmission gear ratio during high-speed running, the rear-wheel transmission gear ratio γr becomes lower than the front-wheel transmission gear ratio γf and the rotational speed of the differential output member (22) is reduced. As a result, the energy circulation for rotationally driving a first motor generator (MG1) in a reverse rotational direction is suppressed, leading to improved energy efficiency. If the gear is shifted to the speed reducing transmission gear ratio during accelerated running, the rear-wheel transmission gear ratio γr becomes higher than the front-wheel transmission gear ratio γf and the rotational speed of the differential output member (22) is increased. As a result, an increase in the engine rotational speed (NE) is allowed, leading to improved power performance.
Inventors:
YOSHIMURA, Takahiro (1 Toyota-cho, Toyota-sh, Aichi 71, 47185, JP)
Application Number:
JP2008/072289
Publication Date:
June 17, 2010
Filing Date:
December 09, 2008
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyota-cho, Toyota-shi Aichi, 71, 47185, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町１番地 Aichi, 47185, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町１番地 Aichi, 47185, JP)
International Classes:
B60K6/52; B60K6/365; B60K6/445; B60K6/547; B60K17/346; B60K17/348; B60L11/14; B60W10/08; B60W20/00
Attorney, Agent or Firm:
IKEDA, Haruyuki (Ikeda Patent Office, Nagoya-Dia. Bldg. No.2 15-1 Meieki 3-chome, Nakamura-ku, Nagoya-sh, Aichi 02, 45000, JP)
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