Title:
POWER OUTPUT DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/043514
Kind Code:
A1
Abstract:
A power output device which is capable of transmitting rotation inputted into
a rotating shaft to a wheel with a large speed reduction ratio and which can be reduced
in the number of parts and size. An electric motor (4) is connected to the inboard
side end part of a casing (1) secured to a vehicle body, one end part of the rotating
shaft (11) is connected to the rotor (7) of the electric motor (4), and eccentric
shaft parts (13a, 13b) are formed at the other end part of the rotating shaft (11)
positioned in the casing (1). External gears (16a, 16b) rotatably supported
by the eccentric shaft parts (13a, 13b) are meshed with internal teeth (18) formed
on the inner periphery of the casing (1) and having the number of teeth larger than
that of each of the external gears (16a, 16b). The external gears (16a, 16b) are
meshed one by one with the internal teeth (18) and revolved by rotating the rotating
shaft (11) to rotate the external gears (16a, 16b) by an amount equivalent to a
difference in the number of teeth between external teeth (17) and the internal
teeth (18) per rotation of the rotating shaft (11), and the rotating motion of
the external gears is transmitted to an inside member (21) through a torque transmission
means (30) to rotate the inside member (21) at a reduced speed. The inside member
(21) is rotatably supported by double rows of rolling elements (26a, 26b) assembled
between the inner member and an outer member (19) installed on the outside of the
inside member and connected to the casing (1). The pitch circle diameters of the
double rows of rolling elements (26a, 26b) are differentiated from each other,
and the rolling elements (26a) with the larger pitch circle diameter are disposed
on the external gear (16a, 16b) side to increase the supporting rigidity of the
inside member (21). The other end of the rotating shaft (11) is rotatably supported
by the inside member (21) to prevent the other end of the rotating shaft (11) from
being swung.
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Inventors:
SUZUKI MINORU (JP)
Application Number:
PCT/JP2006/320188
Publication Date:
April 19, 2007
Filing Date:
October 10, 2006
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
SUZUKI MINORU (JP)
SUZUKI MINORU (JP)
International Classes:
B60K7/00; F16C19/18; F16H1/32; F16H57/02
Foreign References:
| JP2001315534A | 2001-11-13 | |||
| JPH11287300A | 1999-10-19 | |||
| JP2001193809A | 2001-07-17 |
Attorney, Agent or Firm:
KAMADA, Bunji et al. (Nipponbashi 1-chome Chuo-k, Osaka-shi Osaka 73, JP)
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