Pumps – Motor driven – Including means for facilitating assembly or disassembly of...
Reexamination Certificate
1998-09-10
2001-04-17
Argenbright, Tony M. (Department: 3747)
Pumps
Motor driven
Including means for facilitating assembly or disassembly of...
C417S423500, C062S323300
Reexamination Certificate
active
06217297
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims priority from Japanese patent application Nos. Hei 9-260627, filed Sep. 25, 1997, and Hei 10-194682, filed Jul. 9, 1998, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The present invention relates to a mounting structure of an electric motor-driven compressor applied to a hybrid vehicle having an internal combustion engine (engine) and an electric motor for running the vehicle.
2. Description of Related Art:
In recent years, to reduce exhaust gas discharged from an engine, research and development of a hybrid vehicle have been vigorously conducted. In response to this, research and development of a refrigeration cycle for a vehicle, such as an air conditioner for a vehicle, suitable for the hybrid vehicle have been energetically conducted.
In a conventional type vehicle having only an engine as a power source, a driving force for a compressor for the refrigeration cycle thereof is supplied by the engine. However, the hybrid vehicle may have the following problem: since the engine stops in some running states, if the driving force is supplied only by the engine, the refrigeration cycle is also stopped when the compressor is stopped.
Therefore, it is desirable that the refrigeration cycle for the hybrid vehicle employs an electric motor-driven compressor having a built-in electric motor.
Regarding the hybrid vehicle, since the engine and the electric motor for running the vehicle are housed in an engine room, there is little vacant space in the engine room in comparison with a conventional vehicle. Therefore, it is desirable that the electric motor-driven compressor is mounted on the engine.
However, since the vibration of the vehicle caused by the engine acts the compressor for the vehicle, if the conventional compressor supplied with the driving force only by the engine is simply replaced with the electric motor-driven compressor, the vibration of the vehicle probably will damage to the electric motor-driven compressor (in particular, electric motor).
In this connection, there is a refrigeration cycle of a stay-at-home model such as a refrigerator, a home air conditioner or the like, for example, employing the electric motor-driven compressor in the refrigeration cycle. However, in these refrigeration cycles, a large vibration force like the vibration of the vehicle does not act on the electric motor-driven compressor, in contrast to the refrigeration cycle for a vehicle. Therefore, the mounting structure of the electric motor-driven compressor in the refrigeration cycle of a stay-at-home model cannot be applied to the electric motor-driven compressor for a vehicle.
SUMMARY OF THE INVENTION
The present invention is made in light of the foregoing problem, and it is an object of the present invention to provide a mounting structure of an electric motor-driven compressor for a vehicle taking into account the effect of the vibration of the vehicle.
According to a mounting structure of an electric motor-driven compressor of the present invention, the electric motor-driven compressor is mounted on an internal combustion engine in such a manner that an electric motor is positioned closer to the center of gravity of the internal combustion engine than a compression mechanism.
Since the electric motor is positioned closer to the center of gravity in which the vibration of the internal combustion engine is small, a vibration force acting on the electric motor becomes small. Therefore, this prevents the electric motor from being damaged.
According to another aspect of the present invention, the axial direction of an electric motor is parallel to a direction, which is parallel to a contact surface between the internal combustion engine and a fixing portion of an electric motor-driven compressor, and which has the smallest vibration force among directions parallel to the contact surface.
Accordingly, the vibration force applied to the electric motor becomes smaller, damage to insulation of the electric motor can be prevented. Therefore, the reliability (durability) of the electric motor-driven compressor is improved.
According to the another aspect of the present invention, a fixing portion of a motor housing is formed in a position deviated from a part corresponding to a stator core.
Therefore, the stator core is prevented from being greatly deformed in response to a deformation of a motor housing when a bolt is fastened.
REFERENCES:
patent: 4489242 (1984-12-01), Worst
patent: 5441122 (1995-08-01), Yoshida
patent: 5-185860 (1993-07-01), None
patent: 9-53565 (1997-02-01), None
Muraki Toshihiko
Sanuki Masami
Takechi Tetsuya
Tsumagari Yuichi
Argenbright Tony M.
Castro Arnold
Denso Corporation
Pillsbury & Winthrop LLP
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