JP2007104764A - Drive apparatus in hybrid vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the efficiency in an electric motor and the workability when a motive energy combining mechanism, a power generator and the electric motor as a drive apparatus are assembled into a case member. <P>SOLUTION: A stator 11 of the electric motor 4 is accommodated on an inner circumference of a cylindrical accommodation member 12 with a bottom. A bearing 13 is fitted in the center on a bottom plate of the accommodation member 12. One end of a shaft member 9 is rotatably supported by the bearing 13. A rotor 10 attached to an exterior of the shaft member 9 is accommodated within the stator 11. The accommodation member 12 is covered with a lid member 14. The other end of the shaft member 9 is rotatably supported by a bearing 15 fitted in the center of the lid member 14. A stator 18 of a resolver 17 is attached around the center of the accommodation member 12. A rotor 19 of the resolver 17 is attached to the shaft member 9 so as to face the stator 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drive device for a hybrid vehicle, and is particularly suitable for a drive device for a hybrid vehicle that houses a power combining mechanism that combines power from an engine and power of an electric motor and the electric motor in the same case member. It is a thing.

As such a drive device for a hybrid vehicle, for example, there is one in which an electric motor is mounted directly inside a differential case (for example, Patent Document 1). In other words, the stators and the rotors attached to the shaft members constituting the electric motor are individually and directly attached to the inside of the differential case. Further, in this conventional apparatus, a power synthesizing mechanism including a planetary gear mechanism, a generator, and the like are also incorporated in the differential apparatus in the same manner.
JP 2002-120575 A

  However, in the conventional hybrid vehicle drive device, since the power synthesizing mechanism, the generator, and the like are incorporated in the differential case to which the motor is mounted, the case inevitably becomes large, for example, at the mounting position of the rotor or stator of the motor. Machining accuracy tends to decrease. Even if the rotor or stator is mounted at such a mounting position with low processing accuracy, the coaxiality of the electric motor is reduced, leading to a reduction in efficiency. In addition, it is difficult to perform a performance test of an electric motor attached to a large case, and workability is not very good. Further, if the electric motor is supported by a jig for improving the workability of the performance test, the coaxial state of the electric motor is different from the mounted state. In general, a rotational position detection sensor called a resolver is attached to an electric motor. However, this attachment and adjustment are also extremely inefficient.

  The present invention has been made paying attention to the above-described problems, and can improve the efficiency by ensuring the coaxiality of the motor itself, as well as the performance test of the motor and the attachment of the rotational position detecting means. An object of the present invention is to provide a drive device for a hybrid vehicle that can improve the workability.

  In order to solve the above problems, a drive device for a hybrid vehicle of the present invention includes an engine and an electric motor having a rotor and a stator attached to a shaft member, and the power of the engine and the electric power of the electric motor are contained in a case member. In the hybrid vehicle drive device that is combined by the power combining mechanism and travels with the combined power, the stator of the electric motor is stored in the storage member, the rotor is stored inside the stator, and the storage member A bearing attached to the rotor rotatably supports one end of the shaft member of the rotor, attaches a lid member to the storage member, and a bearing attached to the lid member fixes the other end of the shaft member of the rotor. An end portion is rotatably supported, and a stator of rotational position detecting means for detecting the rotational position of the electric motor is attached to either the storage member or the lid member. The rotor of the rotational position detecting means is attached to a position of the shaft member of the rotor facing the stator of the rotational position detecting means, and the housing member and the lid member to which the rotor is attached are housed and fixed in the case member. It is characterized by that.

  Thus, according to the hybrid vehicle drive device of the present invention, the stator of the motor is housed in the housing member, the rotor is housed inside the stator, and the bearing is attached to the housing member. One end of the shaft member of the rotor is rotatably supported, a lid member is attached to the storage member, and the other end of the shaft member of the rotor is rotatably supported by a bearing attached to the lid member. Then, a stator of rotational position detecting means for detecting the rotational position of the electric motor is attached to either the storage member or the lid member, and the stator of the rotational position detecting means is opposed to the shaft member of the rotor. The rotor of the rotational position detecting means is attached to the position, and the housing member and the lid member to which the rotor is attached are housed and fixed in the case member. Since only the stator and the rotor of the motor need to be processed and the machining accuracy can be improved, the coaxiality of the motor can be ensured, thereby improving the efficiency, and the motor can be attached to the storage member and the lid member. In the state where the stator and the rotor are housed, the rotational position detecting means can be attached and the performance test of the electric motor can be performed, so that their workability can be improved.

Next, a first embodiment of the hybrid vehicle drive device of the present invention will be described with reference to the drawings.
FIG. 1 shows a drive device for a hybrid vehicle according to the present embodiment, which is disposed opposite to an output shaft of an engine and outputs the combined power of the engine and the power of the motor. Is a case member. In the case member 1, a damper 2, an electromagnetic clutch 3, an electric motor 4, a generator 5, a power combining mechanism including a planetary gear mechanism 6, and a hydraulic clutch 7 are disposed in this order from the engine side. The operation of this hybrid vehicle drive device is the same as that of the Japanese Patent Application Laid-Open No. 2002-120575. The electric motor 4 also functions as a generator by controlling the direction of torque and current. A main shaft 8 is inserted into the electric motor 4 and the generator 5. By controlling the engagement state of the electromagnetic clutch 3 and the hydraulic clutch 7, power is output to the main shaft 8 and power is output from the main shaft 8. Or can be entered. Incidentally, a spline groove is formed on the inner periphery of the cylindrical support member that supports the rotor of the generator 5, and a plurality of plates are spline-fitted into the spline groove. The support member is formed with an oil passage that opens into the spline groove and communicates with the bearing of the rotor shaft member and the rotor. Accordingly, the hydraulic oil discharged from the inside of the main shaft 8 flows into the oil passage of the support member from the gap between the plates, and then flows out to the bearing and the rotor. Thereby, the lubrication of the bearing and the cooling of the rotor can be performed simultaneously.

  FIG. 2 shows only the electric motor 4 extracted. The electric motor 4 includes a shaft member 9 that is fitted on the outer side of the main shaft 8 and is fastened and released from the main shaft 8 by the electromagnetic clutch 3, a rotor 10 that is attached to the outer periphery of the shaft member 9, and the rotor 10. And a stator 11 disposed on the outer peripheral side. The stator 11 is fitted and stored along the inner periphery of the bottomed cylindrical storage member 12. Then, a bearing 13 is fitted into a circular hole formed in the central portion of the bottom plate of the storage member 12, and the bearing 11 supports the one end of the shaft member 9 in a rotatable manner, while the stator 11. The rotor 10 is housed inside. A disc-shaped lid member 14 is attached to the storage member 12, and a bearing 15 is fitted into a circular hole formed in the central portion of the lid member 14, and the other end of the shaft member 9 is secured by the bearing 15. The end is supported rotatably. A cooling fluid path 16 is formed inside the peripheral wall of the storage member 12.

  On the other hand, around the bearing 13 of the storage member 12, that is, around the center portion of the bottom plate of the storage member 12, a resolver 17, that is, a stator 18 of a sensor (rotational position detecting means) for detecting the rotational position of the electric motor is ring-shaped. The rotor 19 of the resolver 17 is attached at the position of the shaft member 9 that is attached by the holding plate 21 and faces the stator 18.

  The so-called sub-assembled electric motor 4 assembled in this way is housed and fixed inside the case member 1 by using fixing means such as bolts and interference fits (not shown). Therefore, according to the hybrid vehicle drive device of this embodiment, the stator 11 of the electric motor 4 is stored in the storage member 12, and the rotor 10 is stored inside the stator 11 and attached to the storage member 12. One end of the shaft member 9 of the rotor 10 is rotatably supported by the bearing 13, the lid member 14 is attached to the storage member 12, and the rotor 10 is mounted by the bearing 15 attached to the lid member 14. The other end of the shaft member 9 is rotatably supported, and a stator 18 of a resolver (rotational position detecting means) 17 for detecting the rotational position of the electric motor 4 is attached to the storage member 12. A rotor 19 of the resolver 17 is attached to a position of the shaft member 9 facing the stator 18 of the resolver 17, and a storage member 12 to which the rotor 19 is attached, and By storing and fixing the member 14 in the case member 1, only the stator 11 and the rotor 10 of the motor 4 can be stored by the storage member 12 and the lid member 14, and the processing accuracy of the storage member 12 and the lid member 14 can be increased. Since the coaxiality of the electric motor 4 is ensured, the efficiency can be improved, and the stator 11 and the rotor 10 of the electric motor 4 are stored in the storage member 12 and the lid member 14. Since the resolver 17 can be attached or the performance test of the electric motor 4 can be performed, the workability thereof can also be improved (effect of the invention according to claim 1).

  Next, a second embodiment of the hybrid vehicle drive device of the present invention will be described with reference to FIG. The basic configuration of the hybrid vehicle drive device of this embodiment is the same as that shown in the first embodiment of FIG. 2, and the same reference numerals are given to the same reference numerals. In this embodiment, since the thickness of the stator 11 of the electric motor 4 (the length in the left-right direction in FIG. 3) is large, the rotor 10 storage portion of the storage member 12 is relatively recessed inward, and as a result, the stator of the resolver 17 18 and the rotor 19 are prevented from protruding to the left in the drawing from the stator 11 housing portion of the housing member 12. By doing in this way, according to the hybrid vehicle drive device of the present embodiment, it is possible to reduce the axial length of the electric motor 4 to which the resolver 17 serving as the rotational position detecting means is attached in advance.

Next, a third embodiment of the hybrid vehicle drive device of the present invention will be described with reference to FIG. The basic configuration of the hybrid vehicle drive device of this embodiment is the same as that shown in the first embodiment of FIG. 2, and the same reference numerals are given to the same reference numerals. In this embodiment, instead of the holding plate 21 for attaching the resolver stator 11 to the back surface of the bottom plate of the storage member 12, a cover plate 22 is attached, and the cover plate 22 attaches the stator 18 of the resolver 17 to the storage member 12. The stator 18 and the rotor 19 of the resolver 17 are covered. An oil seal 23 is interposed between the cover plate 22 and the inner peripheral portion of the shaft member 9, and the bearing 13 is fitted into the center portion of the bottom plate of the storage member 12 and rotatably supports the shaft member 9. Is a grease-lubricated seal bearing, so that the space from the bearing 13 to the oil seal 23, that is, the space around the stator 18 and the rotor 19 of the resolver 17 is in a liquid-tight state, and the space is referred to as a so-called dry space. To do. As described above, according to the hybrid vehicle drive device of this embodiment, the cover plate 22 that covers the resolver (rotational position detecting means) 17 in a liquid-tight state is attached, thereby preventing foreign matter from entering the resolver 17. Thus, the rotational position detection accuracy of the electric motor 4 can be ensured and the durability can be improved (effect of the invention according to claim 2).
In each of the embodiments described above, the stator 18 of the resolver 17 serving as the rotational position detecting means of the electric motor is attached to the storage member 12 side. However, the stator 18 may be attached to the lid member 14 side.

1 is a cross-sectional view of an overall configuration showing a first embodiment of a drive device for a hybrid vehicle of the present invention. It is sectional drawing of the electric motor of FIG. It is sectional drawing of the electric motor which shows 2nd Embodiment of the drive device of the hybrid vehicle of this invention. It is sectional drawing of the electric motor which shows 3rd Embodiment of the drive device of the hybrid vehicle of this invention.

Explanation of symbols

1 is a case member 2 is a damper 3 is an electromagnetic clutch 4 is an electric motor 5 is a generator 6 is a planetary gear mechanism (power combining mechanism)
7 is a hydraulic clutch 8 is a main shaft 9 is a shaft member 10 is a rotor 11 is a stator 12 is a storage member 13, 15 is a bearing 14, a lid member 16 is a fluid path 17 is a resolver (rotation position detecting means)
18 is a stator 19, rotor 22 is a cover plate

Claims (2)

  A hybrid vehicle comprising an engine and an electric motor having a rotor and a stator attached to a shaft member, wherein the power of the engine and the power of the electric motor are combined by a power combining mechanism in a case member, and the hybrid vehicle travels with the combined power In the drive device, the stator of the motor is housed in the housing member, the rotor is housed inside the stator, and one end of the shaft member of the rotor is rotated by a bearing attached to the housing member. The cover member is supported freely, and the lid member is attached to the storage member, and the other end of the shaft member of the rotor is rotatably supported by a bearing attached to the cover member, and either the storage member or the cover member is supported. On the other hand, a stator of rotational position detecting means for detecting the rotational position of the electric motor is attached, and among the shaft members of the rotor, the stator of the rotational position detecting means is attached. Mounting the rotor of the rotational position detecting means at a position toward the drive apparatus for a hybrid vehicle, characterized in that they the housing member and the cover member attached housed fixed to the casing member.   The drive device for a hybrid vehicle according to claim 1, further comprising a cover plate that covers the rotational position detecting means in a liquid-tight state.

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