JP2006103500A - Hybrid vehicle and propeller shaft supporting method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid vehicle capable of shortening a supporting portion span of a propeller shaft and making a vibration property good while preventing the upsizing of a vehicle body, by improving a mount position of a motor generator for driving front wheels. <P>SOLUTION: The motor generator 10 for driving the front wheels are adjacently disposed at a rear end of an internal combustion engine 2 mounted on a vehicle body front part. A rear wheel transmission 4 inputting the power of the internal combustion engine 2 through the propeller shaft 3 is disposed at a vehicle body rear part. By supporting the propeller shaft 3 with the motor generator 2 and the rear wheel transmission 4, supporting portions spans S at the front and rear portions of the propeller shaft 3 can be shortened. The generation of vibrations due to rotation unbalance is efficiently suppressed. Resonance frequency accompanied with the rotation of the propeller shaft 3 is set in a high area, and resonance of the propeller shaft 3 in a normal use area is suppressed to make vibration characteristics better. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hybrid vehicle in which a propeller shaft for driving rear wheels is extended from an internal combustion engine mounted on a front portion of a vehicle body and front wheels are driven by a motor / generator, and a method for supporting the propeller shaft.

A hybrid vehicle propels a vehicle by using an engine that is an internal combustion engine and a motor / generator that generates driving force and regenerates electric power from wheels, but when the hybrid vehicle is configured for four-wheel drive, Conventionally, a power train for driving rear wheels consisting of an engine, a motor / generator, and a transmission is formed, and a motor / generator for driving front wheels is mounted in front of the engine separately from the power train for driving rear wheels. Is known (for example, see Patent Document 1).
JP 2002-213266 A (page 4, FIG. 1)

  However, in the conventional hybrid vehicle that constitutes a four-wheel drive, when an F / R (front engine / rear drive) -based four-wheel drive vehicle is constructed, the engine is mounted on the front of the vehicle body, and the transmission is mounted on the vehicle body. In this case, the span extending from the engine to the transmission is inevitably long, and the propeller shaft support portion span connecting the two is long.

  Therefore, when the propeller shaft support portion span becomes longer in this way, rotation imbalance occurs, and vibration generated by shaft rotation shifts to the low frequency side to approach the resonance frequency band of each unit constituting the power train. The vibration characteristics of the propeller shaft will deteriorate.

  On the other hand, the motor generator for driving the front wheels is to be mounted further forward of the engine mounted on the front part of the vehicle body. Therefore, it is necessary to provide a space for mounting the motor generator in front of the engine. For this reason, the vehicle body becomes longer in the front direction, and the size of the vehicle body is inevitably increased.

  Accordingly, the present invention provides a hybrid vehicle capable of improving the vibration characteristics by shortening the support portion span of the propeller shaft and preventing the enlargement of the vehicle body by devising the mounting position of the motor generator for driving the front wheels. The propeller shaft support method is provided.

  In the hybrid vehicle of the present invention, a front wheel driving motor / generator is disposed adjacent to the rear end of the internal combustion engine mounted on the front of the vehicle body, and the power of the internal combustion engine is input via a propeller shaft. The most important feature is that the transmission is disposed at the rear of the vehicle body, and the propeller shaft support is provided on the motor / generator and the rear wheel transmission.

  In the propeller shaft support method for a hybrid vehicle of the present invention, a motor generator for driving front wheels is disposed adjacent to the rear end of the internal combustion engine mounted on the front of the vehicle body, and the power of the internal combustion engine is transmitted via the propeller shaft. An input rear wheel transmission is arranged at the rear of the vehicle body, and the propeller shaft is supported by the motor / generator and the rear wheel transmission.

  According to the hybrid vehicle and the propeller shaft support method of the present invention, the front-wheel drive motor / generator is disposed adjacent to the rear end of the internal combustion engine, and the motor-generator and the rear-wheel transmission disposed at the rear of the vehicle body By supporting the propeller shaft, the position of the support portion of the front end portion of the propeller shaft can be the rear end portion of the motor / generator arranged further rearward from the rear end portion of the internal combustion engine. , The support span at the rear end can be shortened.

  By shortening the propeller shaft support span in this way, it is possible to efficiently suppress the occurrence of vibration due to rotational unbalance, and the resonance frequency associated with the rotation of the propeller shaft can be set to a high region. It can be kept away from the resonance frequency band, and the vibration characteristics can be improved by suppressing the resonance of the propeller shaft in the normal use range.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 6 show an embodiment of a hybrid vehicle and a propeller shaft support method according to the present invention, FIG. 1 is a side view showing the power train of the hybrid vehicle seen through, FIG. 2 is a bottom view of the hybrid vehicle, 3 is a cross-sectional side view of the motor / generator for driving the front wheels, FIG. 4 is a perspective view of the motor / generator mounted state viewed from the rear side, and FIG. 5 is an enlarged side view of the main part of FIG. 6 is an enlarged bottom view of the front portion of the hybrid vehicle.

  As shown in FIGS. 1 and 2, the hybrid vehicle 1 of the present embodiment includes an engine 2 as an internal combustion engine, and a rear wheel transmission 4 that inputs the power of the engine 2 via a propeller shaft 3. The rear wheel 7 is driven by transmitting the engine speed changed by the rear wheel transmission 4 to the rear wheel drive shaft 6 via the rear wheel differential 5.

  The engine 2 is mounted in the front compartment F / C which is the front part of the vehicle body, and the rear wheel transmission 4 is disposed in the lower floor portion of the rear seat which is the rear part of the vehicle body. And the rear-wheel transmission device 4 are spaced apart from each other in the vehicle front-rear direction, whereby the overall weight distribution of the vehicle body is achieved.

  The rear wheel transmission 4 is configured by combining a motor / generator for driving a rear wheel and a planetary gear mechanism, and travels using the driving force of the motor / generator (EV mode); A mode (HEV mode) in which the vehicle travels by using both driving forces with the motor / generator is appropriately selected.

  The rear wheel transmission 4 can be configured as a normal transmission using a gear mechanism without incorporating a motor / generator.

  The rear wheel differential 5 includes a final gear and a differential gear, as is generally known. The rear wheel differential 5 is integrally coupled to the rear end of the rear wheel transmission 4.

  The hybrid vehicle 1 according to the present embodiment includes a front-wheel drive motor / generator 10 to drive the front wheels 8, and can be driven by four-wheel drive in combination with the drive of the rear wheels 7. It has become.

  Here, in the hybrid vehicle 1 of the present invention, the motor generator 10 for driving the front wheels is disposed adjacent to the rear end of the engine 2, and the propeller shaft 3 is connected to the motor generator 10 and the rear wheel transmission 4. Support portions 10S and 4S are provided.

  And in the propeller shaft support method of the hybrid vehicle 1 of this invention, the said motor generator 10 arrange | positioned adjacent to the rear end of the engine 2 mounted in the vehicle body front part, and the said rear-wheel transmission 4 arranged in the vehicle body rear part, Thus, the propeller shaft 3 is supported.

  As shown in FIG. 3, the motor generator 10 for driving the front wheels includes an annular rotor 10a, a stator 10b surrounding the outer periphery of the rotor 10a, and a cylindrical motor output shaft coupled to the inner periphery of the rotor 10a. 10c, and each of the constituent members 10a, 10b, 10c is covered with a housing 11.

  The outer periphery of both ends of the motor output shaft 10c is rotatably supported by the housing 11 via bearings 12 and 12a, and the engine output shaft 2a is passed through the motor output shaft 10c so as to be relatively rotatable.

  The motor power output to the motor output shaft 10c is transmitted through a power transmission mechanism 13 including a first and second sprockets 13a and 13b and a chain 13c that goes around the sprockets 13a and 13b. The motor power output to the input shaft 15 to the front wheel differential device 14 and input to the front wheel differential device 14 drives the front wheels 8 via the front wheel drive shaft 16.

  At this time, the power transmission mechanism 13 is incorporated in the motor / generator 10 for driving the front wheels, and the power transmission mechanism 13 is incorporated in the housing 11 of the motor / generator 10.

  The first sprocket 13a of the power transmission mechanism 13 is coupled to the motor output shaft 10c, and the second sprocket 13b is disposed in a protruding portion 11a protruding from one side of the housing 11 as shown in FIG. Arranged and coupled to the rear end of the input shaft 15.

  As shown in FIG. 3, the rear end portion of the front wheel input shaft 15 has both side portions sandwiching the second sprocket 13b rotatably supported by the protruding portion 11a of the housing 11 via bearings 17 and 17a. Is done.

  The housing 11 is integrated with the motor / generator 10 at the rear end of the engine 2 by connecting a flange portion 11b formed at the front end thereof to the rear end of the engine 2 via a bolt 18 as shown in FIG. It is bound to.

  At this time, as shown in FIG. 3, a space portion 11c is formed in the formation portion of the flange portion 11b, and a flywheel 2b attached to the engine output shaft 2a is accommodated in the space portion 11c. The wheel 2b removes torque fluctuations in engine output rotation.

  As shown in FIG. 3, the support portion 10S formed on the motor / generator 10 forms a cylindrical support portion 11d at the rear end portion of the housing 11, and an engine output shaft is provided on the inner periphery of the cylindrical support portion 11d. 2a is configured to be rotatably supported through bearings 19, 19a and an oil seal 19b.

  The motor / generator 10 surrounds the engine output shaft 2a with the entire housing 11 including the cylindrical support portion 11d, and rotatably supports the engine output shaft 2a.

  As shown in FIGS. 1 and 2, the front end portion of the propeller shaft 3 is connected to a portion where the engine output shaft 2a protrudes from the cylindrical support portion 11d via a front joint 3a. 3 is connected to the input shaft of the rear wheel transmission 4 via a rear joint 3b, and a support portion span S (see FIG. 3) between the front joint 3a and the rear joint 3b. 1).

  The housing 11 covering the motor / generator 10 is formed with high rigidity as a whole, and sufficient support rigidity of the engine output shaft 2a, the motor output shaft 10c and the input shaft 15 of the front wheel differential 14 is secured. The coupling strength between the engine 2 and the housing 11 is ensured.

  Accordingly, since the housing 11 of the motor / generator 10 is coupled to the engine 2 and is rigidly integrated, as shown in FIGS. 5 and 6, a rear engine mount 20 that supports the rear portion of the engine 2 is provided in the housing. 11 and the rear engine mount 20 is supported by the front suspension member 21.

  The engine mount 20a that supports the front portion of the engine 2 is supported by a skeletal member at the front of the vehicle body, for example, the front side member 22 or a subframe that is coupled and supported to the lower side of the front side member 22.

  With the above configuration, according to the present embodiment, the front wheel drive motor / generator 10 is coupled to the rear end of the engine 2 and disposed adjacent thereto, so that the rear wheel shift disposed at the rear portion of the motor / generator 10 and the vehicle body. The propeller shaft 3 can be supported by the device 4, and the support portion span S at the front and rear ends of the propeller shaft 3 can be shortened.

  Thus, the shortening of the propeller shaft 3 can efficiently suppress the generation of vibration due to the rotation imbalance, and the resonance frequency associated with the rotation of the propeller shaft 3 can be set in a high region, so that the propeller shaft 3 is connected. The vibration characteristics can be improved by moving away from the resonance frequency band of each unit such as the engine 2 and the rear wheel transmission 4 and suppressing the resonance of the propeller shaft 3 in the normal use range.

  Further, in the present embodiment, the large rear wheel transmission 4 is disposed at the rear of the vehicle body, so that the dash panel located under the feet of the passenger (front passenger) seated in the driver's seat or the front passenger seat is provided in the front compartment F / C. It can be arranged on the side, that is, in a position close to the front of the vehicle, to improve the feeling of spaciousness of the feet of the front seat, and to increase the capacity of the storage part of the front part of the vehicle compartment such as a glove box.

  In addition, since the dash panel can be disposed forward in this manner, the degree of freedom in the layout of the pedal position of the driver's seat can be increased, and thereby the pedal position can be disposed in an appropriate part, and the driver's fatigue level can be increased. Can be reduced.

  Furthermore, the space under the front seat occupant is expanded in this way, so that the stroke of the engine 2 that moves backward at the time of a frontal collision can be secured and the safety can be improved.

  Furthermore, when the vehicle is driven on four wheels, the front wheels 8 are driven only by the motor power from the motor / generator 10, so that the response of driving assistance is improved and the performance at the time of vehicle start and acceleration is improved. Can do.

  Further, by exclusively driving the front wheels 8 only with motor power, the diameters and sizes of the tires of the front wheels 8 and the rear wheels 7 can be made different, and the styling freedom of the vehicle can be expanded.

  By the way, in this embodiment, since the power transmission mechanism 12 for transmitting the motor power to the front wheel 8 side is built in the motor generator 10 for driving the front wheels, the entire motor generator 10 can be configured compactly, and the motor The working time when the generator 10 is assembled to the engine 2 can be shortened, and the relative positional relationship between the motor / generator 10 and the power transmission mechanism 12 is constant, so that the assembling accuracy can be improved.

  Further, the engine 2 is connected to the rear end of the motor / generator 10 integrally and disposed at the front of the vehicle body, and the rear wheel transmission 4 is disposed at the rear of the vehicle body, thereby making it easy to optimize the weight distribution. The running stability and steering stability of the vehicle can be improved.

  Further, by integrally coupling the motor / generator 10 to the rear end of the engine 2 in this way, the motor / generator 10 can be provided with a rear engine mount 20, and the front suspension member can be provided via the rear engine mount 20. 21 can be supported.

  For this reason, in the conventional F / R vehicle, the rear end portion of the transmission coupled to the engine is supported by the floor tunnel portion by the dedicated mounting member. However, in the present embodiment, as described above, the rear side of the engine 2 is placed on the front suspension member. 21, the support rigidity of the engine 2 can be increased to improve the interior silence, and the vibration of the drive system can also be reduced.

  Furthermore, since the motor / generator 10 surrounds and supports the engine output shaft 2a so as to be relatively rotatable, the motor / generator 10 can support the engine output shaft 2a in a well-balanced manner. Misalignment can be prevented, thereby improving the vibration characteristics.

  Further, since the motor / generator 10 is covered with a highly rigid housing 11, the motor / generator 10 can be protected from water and dust, and the mounting rigidity of the motor / generator 10 can be increased to further improve the vibration characteristics. Can be planned.

  By the way, the present invention has been described by taking the above embodiment as an example. However, the present invention is not limited to this embodiment, and various other embodiments can be adopted without departing from the gist of the present invention. The power transmission mechanism 12 that transmits the motor power of 10 to the front wheel side is not limited to the sprockets 12a and 12b and the chain 12c, and may be any configuration that can transmit the motor power using a gear or the like.

It is a side view seeing through the powertrain of the hybrid vehicle in one embodiment of the present invention. It is a bottom view of the hybrid vehicle in one embodiment of the present invention. 1 is a cross-sectional side view of a motor generator for driving front wheels in an embodiment of the present invention. It is a perspective view which shows the attachment state of the motor generator in one Embodiment of this invention. It is the principal part side view which expanded the A section in FIG. It is a bottom view which expands and shows the front part of the hybrid vehicle in one Embodiment of this invention.

Explanation of symbols

1 Hybrid vehicle 2 Engine (internal combustion engine)
2a Engine output shaft 3 Propeller shaft 4 Rear wheel transmission 5 Rear wheel differential 7 Rear wheel 8 Front wheel 10 Motor generator 10c Motor output shaft 11 Housing 11a Cylindrical support 13 Power transmission mechanism 14 Front wheel differential 15 Front wheel input shaft

Claims (6)

  A motor / generator for driving front wheels is disposed adjacent to the rear end of the internal combustion engine mounted on the front of the vehicle body, and a rear wheel transmission for inputting the power of the internal combustion engine via a propeller shaft is disposed at the rear of the vehicle body. A hybrid vehicle characterized in that the propeller shaft support is provided on the motor / generator and the rear wheel transmission.   The hybrid vehicle according to claim 1, wherein the motor / generator includes a power transmission mechanism that transmits motor power to the front wheels.   The hybrid vehicle according to claim 1, wherein the motor / generator is integrally coupled to a rear end of the internal combustion engine.   The hybrid vehicle according to claim 1, wherein the motor / generator surrounds the output shaft of the internal combustion engine and rotatably supports the output shaft.   The hybrid vehicle according to any one of claims 1 to 4, wherein the motor / generator is covered with a highly rigid housing. A motor / generator for driving front wheels is disposed adjacent to the rear end of the internal combustion engine mounted on the front of the vehicle body, and a rear wheel transmission for inputting the power of the internal combustion engine via a propeller shaft is disposed at the rear of the vehicle body. A propeller shaft support method for a hybrid vehicle, characterized in that the propeller shaft is supported by the motor / generator and the rear wheel transmission.

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