Power transmission device for electric vehicle
a technology for transmission devices and electric vehicles, applied in the direction of battery/cell propulsion, transportation and packaging, etc., can solve problems such as negative radio reception effects, and achieve the effect of suppressing noise propagation and reducing noise radiation to the exterior
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first embodiment
[0021]Referring to FIG. 1, a power transmission device for an electric vehicle according to the present invention will be described.
[0022]The power transmission device of the first embodiment is comprised of a motor 1, an inverter 2, a first gear set 3 including a plurality of couplings and meshing parts 4 functioning as resistors, and a grounding path 5.
[0023]The motor 1 is comprised of a motor housing 1a, a rotor shaft 1b rotatably supported by the motor housing 1a, a rotor 1c drivingly coupled with the rotor shaft 1b, and stators 1e fixed to the motor housing 1a. Each stator 1e has an electric coil 1d coiled therearound. The rotor 1c is accordingly comprised of a plurality of permanent magnets, thereby being rotated by a magnetic field generated by the coils 1d. Specifically, any permanent magnet synchronous motor may be applied to the motor 1.
[0024]The inverter 2 is connected with the motor coils 1d of the motor 1 via a three-phase power cable 6, and is in turn connected with a ...
second embodiment
[0049]A gear set with four or more shafts may be alternatively used. FIG. 6 illustrates a second embodiment in which an electric vehicle includes a second gear set 23 of a reduction gear set with four shafts.
[0050]The second gear set 23 intervenes between a rotor shaft 1b and output shafts 23e coupled with wheels 9, thereby transmitting torque from the rotor shaft 1b to the output shafts 23e with reducing its speed.
[0051]The second gear set 23 includes a combination of shafts and meshing gears, all of which are in general carried by a gear casing 23a. The shafts include an input shaft 23b drivingly coupled with and rotated by the rotor shaft 1b, a first counter shaft 23c, a second counter shaft 23d and output shafts 23e for driving wheels 9 in general. The gears include an input gear 23f on the input shaft 23b, first counter gears 23g, 23h on the first counter shaft 23c, one of which meshes with the input gear 23f, second counter gears 23i, 23j on the second counter shaft 23d, one o...
third embodiment
[0055]Alternatively, epicyclic gearing or planetary gearing may be used instead of the aforementioned reduction gears of a parallel shaft system. FIG. 7 illustrates a third embodiment in which a gear set 33 with planetary gearing is used.
[0056]The power transmission device of the third embodiment is comprised of a motor 1, an inverter 2, the gear set 33 including electrically resistive elements 4, and a grounding path 5. Aside from the gear set 33, those as described earlier can be applied to these components 1, 2 and 5 and therefore detailed descriptions thereof will be omitted.
[0057]The gear set 33 intervenes between a rotor shaft 1b of the motor 1 and output shafts 33d, thereby transmitting torque from the rotor shaft 1b to the output shafts 33d.
[0058]The gear set 33 includes a combination of shafts and meshing gears, all of which are in general carried by a gear casing 33a. The shafts include an input shaft 33b, a cylindrical shaft 33c coaxial with the input shaft 33b and an ou...
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