JP2019055765A - Electric vehicle - Google Patents

Abstract

To suppress deterioration in NV performance due to motor noise and gear noise in an electric vehicle comprising an electric drive unit in which a transaxle is accommodated in a case together with an electric motor.SOLUTION: An accessory machine component 70 to be originally disposed in a vehicle is mounted to the outside surface of a bottom part 24a located on a side opposite to the connection part of a transaxle 14 in a case 16, so that the accessory machine component 70 functions as a mass damper, thereby making it possible to damp compelling force (vibration) due to motor torque fluctuation, engagement vibration, or the like, and to improve NV performance, while avoiding the size increase and the weight increase of the case 16. Particularly, the displacement of a motor shaft 34 is limited (restrained) by a differential device 50 or the like on the connection part side of the transaxle 14, so that the bottom part 24a side opposite thereto tends to significantly vibrate. Thus, the vibration of the case 16 can be effectively damped by the mounting of the accessory machine component 70 to the outside surface of the bottom part 24a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electric vehicle, and more particularly to an improvement of an electric vehicle in which a transaxle having a differential device is housed in a case together with an electric motor.

  (a) an electric motor used as a driving force source, and (b) a differential device, and connected to the motor shaft of the electric motor at one end side of the electric motor in the motor center line direction so as to be capable of transmitting power, and the electric motor There is known an electric vehicle including an electric drive unit having a transaxle that transmits the output of the motor to a pair of drive shafts via the differential device, and (c) a case that houses the electric motor and the transaxle. Yes. The vehicle described in Patent Document 1 is one example, and an electric compressor, which is an auxiliary component, is disposed on the outer peripheral surface of the case (near the transaxle).

JP 2016-22799 A

  By the way, in an electric vehicle equipped with such an electric drive unit, a forcing force (vibration) caused by torque fluctuation of the electric motor or gear meshing vibration is transmitted from the motor shaft to the case via the bearing. In addition, it is pronounced as motor noise or gear noise by propagating from the case to the air, and the NV (Noise, Vibration) performance in the passenger compartment may be deteriorated during acceleration / deceleration, for example. . Although it is conceivable to suppress the transmission of the forcing force depending on the structure of the case, new problems such as an increase in the size and weight of the case occur. In addition, when auxiliary parts are arranged on the outer peripheral surface of the case as in the prior art, the auxiliary parts can function as a mass damper to attenuate the vibration caused by the forcible force. could not.

  The present invention has been made in the background of the above circumstances, and the object of the present invention is in an electric vehicle including an electric drive unit in which a transaxle is housed in a case together with an electric motor. The purpose is to suppress the deterioration of NV performance.

  In order to achieve this object, the first invention includes (a) an electric motor used as a driving force source, and (b) a differential device, and the electric motor is arranged at one end side of the electric motor in the motor center line direction. A transaxle coupled to a motor shaft so as to be capable of transmitting power and transmitting the output of the electric motor to a pair of drive shafts via the differential device; and (c) a case housing the electric motor and the transaxle. In the electric vehicle including the electric drive unit, (d) a first end surface portion of the case that is located on the other end side of the electric motor in the motor center line direction and rotatably supports the motor shaft. Is characterized in that a vehicle accessory part is attached to the outer surface of the first end face part.

  The above-mentioned auxiliary machine parts of the vehicle are auxiliary vehicle-mounted equipment different from the mechanical transmission system of the driving force, and are originally mounted on the vehicle, for example, an electric compressor for an air conditioner, an oil cooler, Various on-vehicle equipment such as electronic control equipment such as a valve body and a PCU (Power Control Unit) for controlling an electric motor are targeted.

  According to a second aspect of the present invention, in the electric vehicle according to the first aspect, the accessory part is attached to the first end surface portion so that a center of gravity is offset from the motor center line.

  According to a third aspect of the invention, in the electric vehicle according to the first or second aspect of the invention, the accessory part is attached to the first end surface portion via an attachment member in a state of being separated from the first end surface portion. Features.

  According to a fourth aspect of the present invention, there is provided the electric vehicle according to the third aspect, wherein (a) the electric drive unit is mounted on a front portion of the vehicle in a posture in which the motor center line is parallel to the vehicle width direction; An auxiliary machine component is attached to the first end surface portion via the attachment member so as to protrude in the vehicle width direction from the electric drive unit, and (c) the strength of the attachment member is determined by the vehicle attached to the auxiliary machine component. When a collision load is applied from the front side, the attachment member is set to be deformed or damaged before any of the auxiliary machine parts and the first end face part.

  According to a fifth aspect of the present invention, in the electric vehicle according to the fourth aspect, the auxiliary component is a high-voltage electrical component that uses a high voltage of AC30V or more, and a ground cable for the high-voltage electrical component is connected to the vehicle body and grounded. It is characterized by being.

  According to a sixth aspect of the present invention, in the electric vehicle according to any one of the first to fifth aspects, an elastic body is interposed between the auxiliary component and the first end surface portion.

  According to a seventh aspect of the present invention, in the electric vehicle according to any one of the first to sixth aspects, the auxiliary machine component is a component that generates vibrations by itself.

  An eighth invention is the electric vehicle according to any one of the first to seventh inventions, wherein (a) the differential device is disposed on a second axis parallel to the motor center line, and (b) the The transaxle includes a gear-type power transmission mechanism that transmits the output of the electric motor to the differential device. (C) The electric drive unit has a posture in which the motor center line is parallel to the vehicle width direction. It is mounted on a vehicle.

  A ninth aspect of the invention is the electric vehicle according to any one of the first to eighth aspects of the invention, wherein the electric drive unit includes only the electric motor as a driving force source.

  In such an electric vehicle, the auxiliary device originally disposed in the vehicle on the other end side of the electric motor in the motor centerline direction, that is, the first end surface portion located on the opposite side to the connecting portion of the transaxle in the case. Since parts are attached, this auxiliary machine part functions as a mass damper, avoiding the increase in size and weight of the case and attenuating the forcing force (vibration) caused by motor torque fluctuations and meshing vibrations. Can be improved. In particular, since the displacement of the motor shaft is limited (restrained) by a differential device or the like on the connecting portion side of the transaxle, the opposite first end surface portion side is likely to vibrate greatly, and auxiliary parts are located on the first end surface portion. By being attached, the vibration of the case can be effectively damped as compared with the case where the accessory parts are arranged on the outer peripheral surface of the case as in the prior art.

  In the second invention, since the auxiliary machine parts are attached to the first end face so that the center of gravity of the auxiliary machine parts is offset from the motor center line, a moment is generated by the auxiliary machine parts around the motor center line. In addition, the circumferential vibration around the motor center line can be effectively damped.

  In the third aspect of the invention, since the accessory parts are attached in a state of being separated from the first end face part (floating state) via the attachment member, the accessory is located at a position away from the first end face part in the motor center line direction. The center of gravity of the component is located, the moment with the connecting portion of the transaxle as the origin is increased, and vibrations or swings in the direction perpendicular to the motor center line (radial direction) can be more effectively damped.

  According to a fourth aspect of the present invention, the electric drive unit is mounted on the front side portion of the vehicle in a posture in which the motor center line is parallel to the vehicle width direction, and the accessory parts are interposed via the mounting members so that the auxiliary machine parts protrude from the electric drive unit in the vehicle width direction. When the collision load is applied to the accessory part from the front side of the vehicle when the accessory member is attached to the first end surface part, the attachment member is deformed or deformed before any of the accessory part and the first end face part. The strength of the mounting member is set so as to break. For this reason, the collision load applied to the accessory parts and the case due to the deformation and breakage of the mounting member is reduced, and the damage to the accessory parts and the case, as well as the electric motor disposed in the case, is suppressed. The Since an electric motor used as a driving force source of an electric vehicle generally uses a high voltage, the safety performance against the high voltage is improved by suppressing damage to the electric motor and related electric parts.

  The fifth aspect of the invention is a case where the additional component attached to the first end surface portion of the case is a high-voltage electric component such as an electric compressor or an inverter, and the outer side of the case is increased together with the electric motor in the case due to deformation or breakage of the attachment member. Since damage to voltage electrical components is also suppressed, safety performance against high voltage is appropriately ensured. In addition, since the ground cable of the high-voltage electrical component is connected to the vehicle body, even if the mounting member is damaged, it is possible to easily prevent the high-voltage electrical component from falling off by using the originally required ground cable. it can.

  In the sixth aspect of the invention, since the elastic body is interposed between the auxiliary machine component and the first end surface portion, the dynamic damper that attenuates the vibration of the case by vibrating the auxiliary machine part through the elastic body. The effect can be expected.

  The seventh aspect of the present invention is a case where the auxiliary machine component itself generates vibration (forced force), for example, a case where a moving part is provided inside, such as an electric compressor for an air conditioner, and the electric drive unit is a mass damper against the forced force. When an elastic body is interposed, it also functions as a dynamic damper. In other words, the electric drive unit and the auxiliary machine parts function as a damper with each other, and both forcing forces can be canceled and attenuated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic left side view of a drive power source rear-mounted electric vehicle according to an embodiment of the present invention as viewed from the left side of a vehicle. It is sectional drawing explaining schematic structure of the electric drive unit mounted in the electric vehicle of FIG. 1, and is the figure shown with the auxiliary machinery parts attached to the case. It is the right view which looked at the electric drive unit of FIG. 2 from the auxiliary machine component side. It is the schematic perspective view which showed the specific example of the electric drive unit with which auxiliary machine components were attached. It is a figure explaining another Example from which the attachment aspect of the auxiliary machine parts with respect to an electric drive unit differs, and is sectional drawing corresponding to FIG. It is the right view which looked at the electric drive unit of FIG. 5 from the auxiliary machine component side. It is a figure explaining another Example from which the attachment aspect of the auxiliary machine parts with respect to an electric drive unit differs, and is sectional drawing corresponding to FIG. It is a figure explaining another Example from which the attachment aspect of the auxiliary machine parts with respect to an electric drive unit differs, and is sectional drawing corresponding to FIG. It is a figure explaining another Example from which the attachment aspect of the auxiliary machine parts with respect to an electric drive unit differs, and is sectional drawing corresponding to FIG. It is a figure explaining another Example from which the attachment aspect of the auxiliary machine parts with respect to an electric drive unit differs, and is sectional drawing corresponding to FIG. It is a figure explaining another Example of this invention, and is a schematic left view which looked at the electric vehicle of the driving force source front type from the vehicle left side. It is the schematic plan view which showed the electric drive unit mounted in the electric vehicle of FIG. 11 with the auxiliary machinery components (electric compressor). It is the schematic front view which looked at the electric drive unit with which the auxiliary machine components of FIG. 12 were installed from the vehicle front side. It is the schematic right view which looked at the electric drive unit with which the auxiliary machine components of FIG. 12 were attached from the vehicle right side. In FIG. 14, it is a schematic right view of the state which removed the auxiliary machine components. It is the schematic front view which showed the attachment bracket shown by FIG. 15 independently. It is the schematic bottom view which looked at the mounting bracket of FIG. 16 from the bottom, and is the figure which also showed the attachment state of the auxiliary machine parts with respect to the case of an electric drive unit.

  The present invention is preferably applied to an electric vehicle having only an electric motor as a driving force source, but is also applied to a parallel type or series type hybrid vehicle having an electric motor and an engine (internal combustion engine) as a driving force source. Can be done. An electric vehicle may run using only a vehicle-mounted battery as a power source, but may also have a power generation device such as a fuel cell. As the electric motor, a synchronous motor is preferably used, but an AC motor such as an induction motor, a DC motor, or the like can also be employed. A motor generator that also functions as a generator is preferably used.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a horizontal electric drive unit in which a differential device is disposed on a second axis parallel to the motor center line and is mounted on a vehicle in a posture in which the motor center line is parallel to the vehicle width direction. The present invention can also be applied to a horizontal electric drive unit of a type in which a differential device is disposed on a motor center line and a drive shaft is inserted through a hollow motor shaft. When the drive shaft is inserted through the inside of the motor shaft, the accessory parts are attached, for example, to a peripheral edge offset from the motor center line so as not to interfere with the drive shaft. These horizontally mounted electric drive units are also arranged on the front side of the vehicle to drive the front wheels, and the driving force source front type front wheel drive vehicle is also arranged on the rear side of the vehicle to drive the rear wheels. It is also used for a rear-wheel drive vehicle with a force source. It is also possible to drive the front and rear wheels using a transfer. Further, the present invention can also be applied to a vertically installed electric drive unit (a posture in which the motor center line is in the vehicle front-rear direction) in which the differential device is disposed at a right angle to the motor center line in a plan view viewed from above the vehicle. . As the differential device, a bevel gear type or a planetary gear type is preferably used.

  For example, the transaxle is disposed on one end side (opposite to the first end face) of the electric motor in the motor center line direction, connected to the motor shaft via a gear or the like, and a differential device disposed on one end side thereof. However, the differential device itself is not necessarily arranged at one end side, and can be arranged at a position overlapping the electric motor in the motor center line direction. The transaxle includes, for example, a gear type power transmission mechanism. The power transmission mechanism is a parallel shaft type or planetary gear type reduction mechanism or speed increasing mechanism, and can establish a plurality of gear stages having different gear ratios depending on an engagement device such as a clutch or a brake.

  Auxiliary machine parts of a vehicle are attached to a first end surface portion located on the other end side of the electric motor at least in the motor center line direction, but are attached to one end side of the electric motor, that is, the second end surface portion on the coupling portion side with the transaxle. It is also possible to attenuate the forcing force by attaching auxiliary parts. In addition, accessory parts can be attached to the outer peripheral surface of the case as in the prior art.

  The auxiliary machine component is attached to the first end surface portion in a state of being spaced apart from the first end surface portion in the motor center line direction (for example, a state where at least a part is lifted across the space) via an attachment member. The surface on the side facing the one end surface portion may be attached so as to be in close contact with the first end surface portion via an attachment member over substantially the entire area. A horizontally mounted electric drive unit mounted on the first end surface portion via a mounting member such that the motor center line is substantially parallel to the vehicle width direction and the auxiliary parts protrude from the electric drive unit in the vehicle width direction is a front side of the vehicle. When mounted on the part, the strength of the mounting member is such that, for example, when an impact load is applied to the accessory part from the front side of the vehicle due to an offset collision deviated from the front of the vehicle, the accessory part and the first end face part It is desirable to determine that the mounting member is deformed or broken before any of them. For example, the material, shape, thickness, and the like of the mounting member are set so that the strength of the mounting member is lower than the strength of any attachment part of the auxiliary component to which the mounting member is fixed and the first end surface portion. Specifically, for example, a case mounting portion on the rear side of the vehicle that is fixed to the outer surface of the first end surface portion, and extends from the case mounting portion to the vehicle front side (collision load input side) and is separated from the first end surface portion. When the accessory part is fixed to the accessory mounting part, the accessory part is attached to the front part of the vehicle integrally provided in the case attaching part in a state shifted in the motor center line direction. The support member is supported in a cantilever state so as to float from the first end surface portion, and the attachment member is relatively easily deformed or damaged with respect to a collision load from the front side of the vehicle. Even when a horizontally installed electric drive unit is mounted on the rear part of the vehicle, when a collision load is applied to the auxiliary part from the rear side of the vehicle, the auxiliary part and the first end face part are preceded. It is desirable to set the strength of the mounting member in the same manner as described above so that the mounting member is deformed or broken.

  In the case of an electric vehicle, an electric motor having a high voltage of AC30V or more, for example, AC100V or more, and further about AC300V or more is used as a driving force source. High voltage electrical components using a high voltage comparable to that of an electric motor, such as a unit, are known. There are high-voltage electrical components that use a high voltage of AC30V or higher regardless of the voltage used by the electric motor. When attaching such a high-voltage electrical component to the case of the electric drive unit, it is desirable to make the strength of the attachment member relatively low in order to ensure safety performance against high voltage. However, when carrying out the present invention for the purpose of improving the NV performance, it is not always necessary to set the strength of the mounting member to a relatively low strength as described above. For example, when attaching electric parts that use a low voltage lower than AC30V or auxiliary parts other than electric parts such as oil coolers to the case of the electric drive unit, the electric drive unit can be used to prevent damage to the electric motor. Various embodiments are possible, for example, an attachment member having a lower strength than that of the case and having a strength equal to or higher than that of auxiliary parts can be employed. By connecting the ground cable of the high-voltage electrical component to the vehicle body such as a frame or cross member, it is possible to prevent the high-voltage electrical component from falling off when the mounting member is damaged. Even when the component is directly fixed to the first end surface portion, it is possible to suppress the dropout of the high-voltage electrical component by connecting the ground cable to the vehicle body. When the case of the electric drive unit has a relatively high strength, it is also possible to connect the ground cable to a member other than the vehicle body such as the case for grounding.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified for explanation, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a schematic left side view of an electric vehicle 8 according to an embodiment of the present invention as viewed from the left side. FIG. 2 is a cross-sectional view illustrating a schematic configuration of the electric drive unit 10 mounted on the electric vehicle 8, and FIG. 3 is a right side view of the electric drive unit 10 viewed from the right direction in FIG. FIG. 4 is a schematic perspective view of the external shape of the actual electric drive unit 10. The electric drive unit 10 includes a motor generator 12 disposed on the first axis S1 and used as a driving force source, and a transaxle disposed side by side adjacent to one end of the motor generator 12 in the first axis S1 direction. 14, and a case 16 that accommodates the motor generator 12 and the transaxle 14. The electric drive unit 10 is a horizontal type mounted on the electric vehicle 8 in a posture in which the first axis S1 is parallel to the vehicle width direction. The electric drive unit 10 is disposed on the rear portion of the electric vehicle 8 and rotates the rear wheel 17r. To drive. That is, the electric vehicle 8 of the present embodiment is a rear wheel drive vehicle with a driving force source rearward, in which the electric drive unit 10 is disposed in the rear portion of the vehicle and travels by rotating the rear wheels 17r. The electric drive unit 10 of the present embodiment can also be applied to a front-power-drive vehicle with a driving force source that is disposed in the front portion of the electric vehicle 8 and travels by rotating the left and right front wheels 17f.

  The electric vehicle 8 is a fuel cell type electric vehicle that includes only a single motor generator 12 as a driving power source. An electronic control unit such as an inverter is provided from a fuel cell 18 mounted on the electric vehicle 8 and a battery (not shown). For example, high-voltage power of about 650 VAC is supplied. The fuel cell 18 can be omitted and power can be supplied only by the battery, or the fuel cell 18 can be applied to a series-type hybrid vehicle equipped with a generator driven by an engine instead of the fuel cell 18 as a power source. . The electric vehicle 8 corresponds to an electric vehicle, the motor generator 12 selectively functions as an electric motor and a generator, corresponds to an electric motor, and the first axis S1 corresponds to a motor center line.

  The case 16 includes a bottomed cylindrical gear case portion 20 that houses the transaxle 14, a cylindrical motor case portion 22 that houses the motor generator 12, and a bottomed cylindrical cover portion 24. ing. The motor case portion 22 is integrally provided with a partition plate 22a extending to the inner peripheral side, and one opening portion of the motor case portion 22 is integrally coupled to the opening portion of the gear case portion 20 by a bolt or the like. Thus, a gear housing space 26 is formed between the gear case portion 20 and the partition plate 22a, and the transaxle 14 is housed in the gear housing space 26. The opening of the cover portion 24 is integrally coupled to the other opening of the motor case portion 22 with a bolt or the like, and a motor accommodating space 28 for accommodating the motor generator 12 is formed therein. The bottom portion 24a of the cover portion 24 corresponds to a first end surface portion located on the opposite side of the transaxle 14 in the first axis S1 direction, that is, the other end side of the motor generator 12, and the bottom portion 20a of the gear case portion 20 has a first axis line. This corresponds to the second end surface portion located on one end side of the motor generator 12 in the S1 direction.

  The motor generator 12 is a synchronous motor and includes an annular stator 30 and a rotor 32 that are concentric with the first axis S <b> 1. The rotor 32 has a smaller diameter than the stator 30 and is disposed inside the stator 30. The motor shaft 34 is fixed at the center. The stator 30 is formed with comb teeth and a large number of coils are wound thereon. The projecting dimensions of both ends projecting in the direction of the first axis S1 are different from each other. The protrusion dimension to the side (right direction in FIG. 2) is large, and the weight on the cover part 24 side is increased. However, the projecting dimensions of the coils at both ends can be made substantially the same, and the weight can be made substantially the same. The motor shaft 34 is configured by a plurality of members connected by splines or the like as necessary. The stator 30 is integrally fixed to the inside of the motor case portion 22 by press-fitting or the like, while the motor shaft 34 is arranged around the axis that coincides with the first axis S1 through three sets of bearings 36, 38, and 40. The case 16 is rotatably supported by the case 16. The bearing 36 is disposed on the bottom 24a of the cover portion 24 and rotatably supports the end portion of the motor shaft 34. The bearing 38 is disposed on the partition plate 22a and rotates an intermediate portion of the motor shaft 34. The bearing 40 is disposed on the bottom portion 20a of the gear case portion 20, and rotatably supports the end portion of the motor shaft 34.

  The transaxle 14 transmits power between the differential device 50 disposed on the second axis S2 parallel to the first axis S1, and the motor shaft 34 of the motor generator 12 and the ring gear 52 of the differential device 50. And a mechanism 54. The power transmission mechanism 54 is, for example, a parallel shaft type or planetary gear type reduction gear mechanism that decelerates the rotation of the motor shaft 34 and transmits it to the differential device 50. The differential device 50 is a bevel gear type differential mechanism, and transmits the power transmitted to the ring gear 52 from a pair of side gears to a pair of left and right drive shafts 56 via a constant velocity joint or the like. As a result, the left and right rear wheels 17r are driven to rotate. The differential device 50 is supported by the case 16 via a pair of bearings 58 and 60 so as to be rotatable around the second axis S2.

  Such an electric drive unit 10 is disposed on the vehicle body via a rubber mount or the like, and a forcing force (vibration) that uses a torque fluctuation of the motor generator 12 or a meshing vibration of a gear as a vibration source is a motor shaft. 34 is transmitted to the case 16 through the bearings 36, 38, and 40, and further propagated from the case 16 into the air. As a result, motor noise and gear noise are generated, and the NV performance in the passenger compartment deteriorates during acceleration and deceleration. Sometimes. The vibration is also transmitted to the case 16 from the bearings 58 and 60 that rotatably support the differential device 50, and the NV performance may be impaired. The torque fluctuation of the motor generator 12 is, for example, fluctuation of power running torque or regenerative torque, and vibration with a frequency corresponding to the number of poles is generated. The meshing vibration is a vibration in the rotational direction due to a gear meshing error or the like, or a vibration in the axial direction by a helical gear, and generally a vibration having a frequency corresponding to the rotational speed is generated.

  On the other hand, in the present embodiment, the bottoms 20a and 24a, which are a pair of end surfaces located at both ends of the case 16 in the first axis S1 direction, are opposite to the transaxle 14, that is, close to the motor generator 12. A vehicle accessory part 70 is attached to the outer surface of the bottom 24a on the side. In the present embodiment, as the auxiliary machine component 70, the electric compressor for the air conditioner is in a state of being separated (floating) from the bottom 24a via a plurality (four in the embodiment) of the attachment members 72, and the auxiliary machine component 70 The center of gravity O of 70 is fixed to the bottom 24a so as to be located on the first axis S1. The position and number of the attachment members 72 are determined as appropriate. An elastic body 74 such as a rubber block or a rubber bush is interposed between the plurality of mounting members 72 and the bottom 24a. The plurality of attachment members 72 are fixed to the bottom 24a with bolts or the like (not shown) in a state where the elastic body 74 is elastically deformed so as to have a predetermined rigidity according to the vehicle type or the like. The rigidity of the elastic body 74 can be adjusted according to the fastening torque of a bolt or the like.

  In the electric vehicle 8 of this embodiment, the position of the electric drive unit 10 on the opposite side to the connecting portion of the transaxle 14 with the motor generator 12 interposed in the direction of the first axis S1 that is the motor center line in the case 16 of the electric drive unit 10. Since the auxiliary machine part 70 originally disposed on the vehicle is attached to the outer surface of the bottom 24a, the auxiliary machine part 70 functions as a mass damper, thereby avoiding an increase in size and weight of the case 16. NV performance can be improved by attenuating forcing (vibration) due to motor torque fluctuations, meshing vibrations, and the like. In particular, since the displacement of the motor shaft 34 is restricted (restrained) by the differential device 50 or the like on the connecting portion side of the transaxle 14, the opposite bottom 24a side tends to vibrate greatly, and the auxiliary machine part 70 is placed on the bottom 24a. By being attached, the vibration of the case 16 can be effectively damped as compared with the case where auxiliary machine parts are arranged on the outer peripheral surface of the case as in the prior art.

  Further, since the auxiliary machine component 70 is attached in a state of being separated (floating) from the bottom 24a via the attachment member 72, the center of gravity of the auxiliary machine component 70 is located at a position separated from the bottom 24a in the first axis S1 direction. O is located, and the moment with the connecting portion of the transaxle 14 as the origin increases, and vibration or swing A (see FIG. 2) in the direction perpendicular to the first axis S1 (radial direction) is more effectively performed. Can be attenuated.

  Further, since the elastic body 74 is interposed between the auxiliary machine component 70 and the bottom portion 24a, the dynamic damper that attenuates the vibration of the case 16 when the auxiliary machine component 70 is vibrated through the elastic body 74. The effect can be expected.

  In addition, an electric compressor is attached to the bottom 24a as the auxiliary machine part 70, and the auxiliary machine part 70 itself generates a forcing force (vibration) by an internal moving part (such as a rotating body). The electric drive unit 10 functions as a mass damper and a dynamic damper. That is, the electric drive unit 10 and the auxiliary machine component 70 function as a damper with respect to each other, and both the forcing forces can be canceled and attenuated.

  Next, another embodiment of the present invention will be described. In the following embodiments, parts that are substantially the same as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  5 and 6 are a sectional view and a right side view corresponding to FIGS. 2 and 3, respectively. In this embodiment, the accessory part 70 is attached to the bottom 24a via the pair of attachment members 72 so that the center of gravity O of the accessory part 70 is offset from the first axis S1 that is the motor center line. Yes. In this case, since a moment is generated by the auxiliary component 70 around the first axis S1, that is, around the motor center line, the circumferential vibration around the motor center line can be effectively damped. In addition, the arrangement | positioning position of the auxiliary components 70 around the 1st axis S1 and the number of the attachment members 72 can be set arbitrarily.

  FIG. 7 is a cross-sectional view corresponding to FIG. This embodiment is different from the embodiment of FIG. 2 in that an elastic body 74 is interposed between a plurality of attachment members 72 and auxiliary machine parts 70. Also in this case, substantially the same effect as the embodiment of FIG. 2 can be obtained.

  FIG. 8 is a cross-sectional view corresponding to FIG. This embodiment is different from the embodiment of FIG. 2 in that a plurality of mounting members 72 are divided into two parts 72a and 72b, respectively, and an elastic body 74 is interposed in an intermediate portion thereof. Also in this case, substantially the same effect as the embodiment of FIG. 2 can be obtained.

  FIG. 9 is a cross-sectional view corresponding to FIG. This embodiment is different from the embodiment of FIG. 2 in that the auxiliary machine component 70 is attached to the bottom portion 24a via a plurality of attachment members 72 without the elastic body 74 interposed. In this case, although the function of the dynamic damper by the elastic body 74 cannot be obtained, the same functions and effects as those of the embodiment of FIG.

  FIG. 10 is a cross-sectional view corresponding to FIG. This embodiment is different from the embodiment of FIG. 2 in that the auxiliary machine component 70 is directly attached to the bottom 24a without the attachment member 72 and the elastic body 74 interposed. That is, depending on the shape of the bottom part 24a, the auxiliary machine part 70 can be attached to the bottom part 24a as it is, and the damper effect by the auxiliary machine part 70 is obtained. Even in this case, the elastic body 74 can be interposed between the bottom 24a and the auxiliary machine component 70 as necessary.

  As shown in FIGS. 5 and 6, the embodiment in which the center of gravity O of the auxiliary machine component 70 is offset from the first axis S <b> 1 can be performed in the same manner as in FIGS. 7 to 10. is there.

  11 to 17 are diagrams for explaining still another embodiment of the present invention. FIG. 11 corresponds to FIG. 1 and is a schematic left side view of an electric vehicle 100 that is an electric vehicle. The electric vehicle 100 is a front-wheel-drive vehicle with a driving force source that is mounted on the front side of the vehicle and travels by rotating the left and right front wheels 17f. The electric drive unit 110 is configured substantially in the same manner as the electric drive unit 10 shown in FIG. 2, and includes a motor generator 12, a transaxle 14, a case 16, and the like.

  12 is a schematic plan view of the electric drive unit 110 as seen from the upper side of the vehicle, FIG. 13 is a schematic front view of the electric drive unit 110 as seen from the front side of the vehicle, and FIG. 14 shows the electric drive unit 110 from the right side of the vehicle. It is the general | schematic right view seen. In these drawings, the electric drive unit 110 is attached to and supported by an upper side cross member 112 disposed along the vehicle width direction on the vehicle upper side of the electric drive unit 110 via a mount or the like. . In addition, an electric compressor 114 for an air conditioner, which is an auxiliary component, is attached to the bottom 24a of the cover 24 that is the first end surface portion of the electric drive unit 110, that is, the end surface portion on the vehicle right side of the case 16 in this embodiment. It is attached in a state of protruding to the right of the vehicle using the brat 116. The electric compressor 114 is a high voltage type electric compressor that is operated at the same high voltage of AC 650 V as the motor generator 12, and the ground cable 118 is connected to the upper cross member 112 and grounded. The upper side cross member 112 corresponds to a vehicle body, the electric compressor 114 corresponds to a high voltage electrical component, and the mounting bracket 116 corresponds to a mounting member. The gear case portion 20 and the motor case portion 22 of the case 16 may be further divided into a plurality of members as necessary.

  15 is a schematic right side view of the state where the electric compressor 114 is removed from the mounting bracket 116 in FIG. 14, and FIG. 16 is a schematic front view showing the mounting bracket 116 alone, as viewed from the same direction as FIG. FIG. FIG. 17 is a schematic bottom view of the mounting bracket 116 of FIG. 16 as viewed from below, and is a view showing the mounting state of the electric compressor 114 with respect to the cover portion 24 of the case 16. The mounting bracket 116 is made of a metal material such as an aluminum casting, and is fixed to the outer surface of the bottom 24a of the cover portion 24. The case mounting portion 120 on the vehicle rear side and the case mounting portion 120 to the vehicle front side. An auxiliary machine attachment part 122 on the front side of the vehicle integrally provided in the case attachment part 120 in a state of being shifted in the first axis S1 direction so as to extend and be separated from the bottom part 24a of the cover part 24. The electric compressor 114 is fixed to the attachment portion 122. The case mounting portion 120 is fixed to the cover portion 24 using five bolts 124 as shown in FIG. 15, while the electric compressor 114 uses four bolts 126 as shown in FIG. And is fixed to the accessory mounting portion 122. That is, the mounting strength of the mounting bracket 116 to the cover portion 24 is relatively higher than the mounting strength of the electric compressor 114 to the mounting bracket 116. The case mounting portion 120 of the mounting bracket 116 is provided with five bolt insertion holes 128 through which the bolts 124 are inserted, and the auxiliary device mounting portion 122 of the mounting bracket 116 is screwed with four bolts 126. A screw hole 130 is provided. The auxiliary machine mounting part 122 is provided in a state where a part of the rear side of the vehicle overlaps with the case mounting part 120.

  Further, the auxiliary machine mounting part 122 of the mounting bracket 116 is separated from the cover part 24, and the electric compressor 114 is fixed to the auxiliary machine mounting part 122, so that the electric compressor 114 is cantilevered so as to float from the cover part 24. Supported in state. As a result, for example, when the collision load F is applied to the electric compressor 114 from the front side of the vehicle as shown in FIG. 17 due to an offset collision shifted from the front of the electric vehicle 100 to the right side, the mounting bracket 116 is deformed relatively easily. Or it becomes easy to break. That is, the strength of the mounting bracket 116 is set to be higher than any of the electric compressor 114 and the cover portion 24 when a collision load F is applied to the electric compressor 114 from the front side of the vehicle at the time of a frontal collision of the electric vehicle 100. The bracket 116 is determined to be deformed or broken. Specifically, for example, the strength of the mounting bracket 116 is lower than the strength of any mounting portion of the cover 24 and the electric compressor 114 fixed to the mounting bracket 116 with respect to the collision load F from the front side of the vehicle. As described above, the material, shape, thickness, and the like of the mounting bracket 116 are set.

  Also in such an electric vehicle 100, substantially the same operation effect as the electric vehicle 8 including the electric drive unit 10 can be obtained. In this embodiment, the elastic body 74 is not provided, but since the electric compressor 114 is supported in a cantilever manner via the mounting bracket 116, a dynamic damper effect close to the elastic body 74 is expected depending on the support rigidity. it can.

  On the other hand, the electric vehicle 100 according to the present embodiment is a front-wheel-drive vehicle with a driving force source that is mounted on the front portion of the vehicle and rotationally drives the left and right front wheels 17f. When a collision load F is applied to the electric compressor 114 provided so as to protrude in the direction from the front side of the vehicle, the mounting bracket 116 is deformed or damaged before any of the electric compressor 114 and the cover portion 24. The strength of the mounting bracket 116 is set. For this reason, the collision load F applied to the electric compressor 114 and the cover part 24 due to the deformation and breakage of the mounting bracket 116 is reduced, and the motor disposed inside the electric suppressor 114, the cover part 24, and further the cover part 24. Damage to the generator 12 and the like is suppressed. Since the electric compressor 114 and the motor generator 12 use a high voltage of AC650V, the safety performance against the high voltage is appropriately ensured by suppressing such damage.

  Further, since the ground cable 118 of the electric compressor 114 is connected to the upper cross member 112, even if the mounting bracket 116 is damaged, the drop of the electric compressor 114 is easily suppressed by using the originally required ground cable 118. can do.

  In each of the embodiments shown in FIGS. 1 to 9, the collision load is applied to the auxiliary component 70 provided to protrude in the vehicle width direction through the mounting members 72, 72a, 72b on the bottom 24a of the cover 24. When added, the strength (number or thickness) of the mounting members 72, 72a, 72b is so that the mounting members 72, 72a, 72b are deformed or damaged before any of the auxiliary machine parts 70 and the bottom 24a. By setting the material, etc., damage to the electric drive unit 10 and the auxiliary machine component 70 can be suppressed.

  As mentioned above, although the Example of this invention was described in detail based on drawing, these are one Embodiment to the last, This invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

  8, 100: Electric vehicle (electric vehicle) 10, 110: Electric drive unit 12: Motor generator (electric motor, driving force source) 14: Transaxle 16: Case 24a: Bottom portion (first end surface portion) 34: Motor shaft 50 : Differential device 54: Power transmission mechanism 56: Drive shaft 70: Auxiliary parts 72, 72 a, 72 b: Mounting member 74: Elastic body 112: Upper side cross member (vehicle body) 114: Electric compressor (auxiliary parts, high voltage electricity 116): Mounting bracket (mounting member) 118: Ground cable S1: First axis (motor center line) S2: Second axis O: Center of gravity

Claims (9)

An electric motor used as a driving force source;
Including a differential device, coupled to a motor shaft of the electric motor on one end side of the electric motor in the motor center line direction so as to be capable of transmitting power, and transmitting an output of the electric motor to a pair of drive shafts via the differential device A transaxle,
A case for housing the electric motor and the transaxle;
In an electric vehicle equipped with an electric drive unit having
The first end surface portion of the case that is located on the other end side of the electric motor in the motor center line direction and rotatably supports the motor shaft is arranged on the outer surface of the first end surface portion of the vehicle. An electric vehicle characterized in that machine parts are attached. The electric vehicle according to claim 1, wherein the auxiliary machine component is attached to the first end surface portion so that a center of gravity is offset from the motor center line. The electric vehicle according to claim 1, wherein the auxiliary machine component is attached to the first end surface portion via an attachment member in a state of being separated from the first end surface portion. The electric drive unit is mounted on the front portion of the vehicle in a posture in which the motor center line is parallel to the vehicle width direction,
The auxiliary machine component is attached to the first end surface portion via the attachment member so as to protrude from the electric drive unit in the vehicle width direction,
The strength of the attachment member is such that when a collision load is applied to the accessory part from the front side of the vehicle, the attachment member is deformed or damaged before any of the accessory part and the first end surface portion. The electric vehicle according to claim 3, wherein the electric vehicle is set as follows. The auxiliary machine component is a high-voltage electrical component that uses a high voltage of 30 V AC or more, and a ground cable of the high-voltage electrical component is connected to the vehicle body and is electrically grounded. The electric vehicle described. The electric vehicle according to any one of claims 1 to 5, wherein an elastic body is interposed between the auxiliary machine component and the first end surface portion. The electric vehicle according to any one of claims 1 to 6, wherein the auxiliary machine component is a component that generates vibration by itself. The differential device is disposed on a second axis parallel to the motor center line,
The transaxle includes a gear-type power transmission mechanism that transmits the output of the electric motor to the differential device;
The electric vehicle according to any one of claims 1 to 7, wherein the electric drive unit is mounted on the vehicle in a posture in which the motor center line is parallel to the vehicle width direction. The electric vehicle according to any one of claims 1 to 8, wherein the electric drive unit includes only the electric motor as a driving force source.

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