1. A transmission having a braking device integrated with a reduction gear power transmission system, in which a drive motor is provided on a first end of a housing and drive device is provided on an opposite second end of the housing, the transmission comprising:
an output shaft provided at a predetermined position in the housing to receive power from the drive motor;
a drive shaft coaxially coupled to the output shaft;
a drive gear provided at a predetermined position on the drive shaft;
a driven gear engaging with the drive gear;
a driven shaft coaxially coupled to the driven gear and being parallel to the drive shaft, so that power is transmitted from the drive shaft to the drive device through the driven shaft;
the braking device coaxially coupled to an outer surface of a portion of the driven gear that faces the drive motor; and
a planetary gear assembly provided on an outer surface of the driven shaft at a position adjacent to the drive device to transmit the power at reduced speed, wherein
the housing is separable at a point between the driven gear and the planetary gear assembly.
2. The transmission as set forth in claim 1, further comprising:
a needle bearing and a needle roller bearing provided on each of opposite ends of the driven shaft.
3. The transmission as set forth in claim 1, further comprising:
a ring gear engaging with the planetary gear assembly outside a radius of rotation of the planetary gear assembly and integrally coupled at a predetermined position to an inner surface of the housing.
4. The transmission as set forth in claim 1, further comprising:
a coupler and a parking pin coupled to the braking device at a position adjacent to the drive motor; and
a parking lever coupled to the parking pin at a position adjacent to the drive motor and hinged at an end thereof to the first end of the housing.
5. A transmission having a braking device integrated with a reduction gear power transmission system, in which a drive motor is provided on a first end of a housing and drive device is provided on an opposite second end of the housing, the transmission comprising:
an output shaft provided at a predetermined position in the housing to receive power from the drive motor;
a drive shaft coaxially coupled to the output shaft;
a drive gear provided at a predetermined position on the drive shaft;
a driven gear engaging with the drive gear;
a driven shaft coaxially coupled to the driven gear and being parallel with the drive shaft, so that power is transmitted from the drive shaft to the drive device through the driven shaft;
the braking device coaxially coupled to an outer surface of a portion of the driven gear that faces the drive motor; and
a planetary gear assembly provided on an outer surface of the driven shaft at a position adjacent to the drive device to transmit the power at reduced speed, wherein
a space for receiving the driven gear communicates with a space for receiving the braking device in the housing, a through hole is longitudinally formed through the driven shaft, and oil passing holes are formed in the housing around respective opposite ends of the driven gear and are connected to the receiving space for the braking device, thus defining an oil flow path.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. An EGR valve device comprising:
a motor rotating unit having a stator, in which each of a fixed number of coils is arranged in a peripheral direction of a stator core, and a rotor in which each of a plurality of magnets is fitted to an outer peripheral face corresponding to one coil of the stator;
a valve drive mechanism for driving a valve linearly according to the rotation of the rotor of the motor rotating unit;
a bearing for rotatably supporting the rotor, to which the magnets are fitted, with respect to the stator; and
a current carrying device, which is arranged at a position placed on an outer side opposite to a side arranging the magnets on a rotational axis of the rotor with respect to the bearing, for commutating a direct current supplied from a power source according to a position of the rotor and supplying the commutated current to one coil of the stator.
2. An EGR valve device according to claim 1, wherein the current carrying device comprises a plurality of slip rings, a plurality of commutator pieces and a plurality of motor brushes, a disk-shaped feeding unit comprises the slip rings and the commutator pieces, and the disk-shaped feeding unit is integrally fitted to an extension of the rotor which extends to the outer side opposite to the side arranging the magnets on the rotational axis of the rotor with respect to the bearing.
3. An EGR valve device according to claim 2, further comprising a shielding member which shields an opening between the motor rotating unit and the current carrying device.
4. An EGR valve device according to claim 3, wherein the shielding member is tightly fitted to an outer peripheral face of an outer ring of a bearing in which an inner peripheral face of an inner ring is tightly fitted to an outer peripheral face of the extension of the rotor on which the magnets are fitted, and the shielding member seals the bearing, covers an open face of the motor rotating unit placed toward the current carrying device and is arranged between the bearing and the current carrying device.
5. An EGR valve device according to claim 1, wherein the current carrying device is assembled onto the position of the extension of the rotor after assembling the motor rotating unit.