ON-VEHICLE ROTARY ELECTRIC MACHINE

An on-vehicle rotary electric machine includes a first member provided with a stator, a rotor, and a housing in which the stator and the rotor is housed, a second member adjacent to the first member in an axial direction, and a third member adjacent to the second member in the axial direction at an opposite side of the first member, and the first member, the second member, and the third member are pierced by a through bolt in the axial direction and are fixed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

An embodiment according to the present invention is illustrated inFIG. 1.

As an on-vehicle rotary electric machine, a drive motor unit2, an inverter unit3, and a control unit connector4are layered in this order with respect to a driven part case1, and are fixed to a screw-worked mounting flange la of a driven part case with three through bolts5, for example, through a control unit mounting flange4a,an inverter unit mounting flange (inverter side)3b,an inverter unit mounting flange (drive motor side)3a, a drive motor unit mounting flange (inverter side)2b,and a drive motor unit mounting flange (driven side)2a,so that the on-vehicle rotary electric machine functions in a mechanically and electrically integrated manner.

When electric power is supplied to a connector part8, the electric power is controlled by the control unit4coupled to the connector part8, and is transferred to the inverter unit3. The electric power is converted into AC power by the inverter unit3, and is supplied to the drive motor unit2. A revolving magnetic field occurs in a stator10housed in a housing12, so that a rotor11is rotated to transfer power to a driven side via a gear and the like.

The control unit4including the connector part8is formed of a resin case for the purpose of electric insulation. The resin case cannot bear a tightening load of the through bolts5in a direct way. Therefore, it is configured such that a mounting bush6is formed by insert molding, and the mounting bush6is subjected to the tightening load.

That is, the three through bolts5generate tension with the mounting bush6located furthest from the driven part case flange1a, and are fixed while keeping balance roughly at regular intervals in a circumferential direction. This form is illustrated inFIGS. 2 and 3. Thus, even the cantilever structure supports a vicinity of the end portion of the whirling. Therefore, a vibration as external force or a vibration due to rotation of the rotor11can be suppressed.

Here, the number of the through bolts5requires two or more in terms of balancing. Also, the bolt may be a stud bolt, and is fixed with a nut.

To realize the mechanically and electrically integrated structure, the long through bolts5are used for fixing. Therefore, there is a concern that the bolts themselves are vibrated and may cause a noise. Therefore, it is configured such that an elastic member7such as rubber is disposed between an internal diameter portion of the flanges located near the center of the length of the through bolts5((the drive motor unit mounting flange (inverter side)2band the inverter unit mounting flange (drive motor side)3a)) and the through bolts5, so that the vibration of stem portions of the bolts is suppressed. A state is illustrated inFIG. 4, where a step is provided in this flange portion so that the through bolts5cannot be come out at the time of insertion and the elastic member7is disposed in this flange portion in advance.

Also, an example in which the elastic member7is applied to the through bolt5in advance is illustrated inFIG. 5. This elastic member may be substituted for an adhesive and the like. Further, the disposing of the elastic member7has a function to lock the through bolt5.

With such a configuration, the drive motor unit2, the inverter unit3, and the control unit connector4are layered in this order with respect to the driven part case1to form a mechanically and electrically integrated structure, so that an electrically loss-less configuration is secured. Such a structure is fixed with the three through bolts5, whereby the number of mounting bolts can be reduced, and an inexpensive structure with reduced assembly processes can be realized. Also, since the end portion direction that is whirled is supported, a vibration can be suppressed. Further, the elastic supporting member is provided between the central portion of the through bolts and the flange portion where the bolts pierce, whereby the vibration of the long through bolts5can be suppressed, and the possibility of generation of a noise can be suppressed.

Functions and effects of the above-described embodiment according to the present invention are as follows.

A drive motor (first member), an inverter unit (second member), and a control connector unit (third member) are coaxially arranged and have a mechanically and electrically integrated structure, and electrical connection is housed in each cabinet, whereby special electric wiring and the like is not required outside the cabinet, and an effective structure and arrangement having no loss like an increase of resistance and the like can be realized.

To realize this structure, it is configured such that the whole members are fixed to a non-driving part all together with through bolts. Therefore, the number of mounting bolts is reduced, and the fixing directions face in the same direction, whereby the assembly processes can be reduced and an inexpensive structure can be provided. Further, the structure in which the (first member), the (second member), and the (third member) are coaxially layered in a three-tiered manner is a cantilever structure wherein the members are held with respect to a non-driving part. Therefore, there is a concern, in the event of a vibration, that a vibration mode may occur in which an electric connection connector side at an end portion side based on the non-driving part is whirled. However, use of the through bolts suppresses the whirling vibration as well as a noise.

Furthermore, as to the concern of generation of a noise due to resonance of the long through bolts, it is configured such that the elastic member is laid among near the center of the through bolts, the electric motor, and the fitting flanges of the driver unit. Therefore, there is an effect of resolving this concern.