JP7091299B2 - Vehicle drive unit - Google Patents

Description

The present invention relates to a vehicle drive unit mounted on an electric vehicle or the like.

Conventionally, a vehicle drive unit mounted on an electric vehicle or the like has been a rotary electric machine, a housing in which the rotary electric machine is housed, a power converter for controlling the rotary electric machine, and a power source for connecting the power converter and a power source. It is equipped with a cable. The power cable is often routed to the back of the housing. Therefore, if a large external force acts in the front-rear direction of the vehicle due to a collision or the like, the power cable may be pinched between the housing and the parts arranged behind the housing and the wire may be disconnected. In order to prevent disconnection of the power cable due to such a collision, Patent Document 1 describes that the power cable is arranged in a recess provided at the rear of the housing to protect the power cable.

Japanese Unexamined Patent Publication No. 2014-220961

However, there is a problem that the power cable is easily affected by the swing of the vehicle only by arranging the power cable in the recess of the housing as in the vehicle drive unit of Patent Document 1. When vibration is transmitted to the power cable due to the shaking of the vehicle, a large stress is generated at the connection portion between the power cable and the power converter.

The present invention provides a vehicle drive unit capable of suppressing the influence of rocking of a vehicle on a power cable connecting a power converter and a power source.

The present invention
With a rotary electric machine,
A housing for accommodating the rotary electric machine and
The power converter that controls the rotary electric machine and
A vehicle drive unit including a power cable for connecting the power converter and a power source.
The housing is provided with a guide portion for accommodating and guiding a part of the power cable.
A part of the power cable is routed along the guide portion, and at the same time,
The power cable extends from the center side in the vehicle width direction to the outside of the guide portion with respect to the connection portion between the power cable and the power converter .
The guide portion has an inlet of the power cable and an outlet of the power cable.
The connection portion is inclined toward the inlet of the guide portion with respect to the outer surface of the power converter in which the connection portion is located.
The entrance of the guide portion is provided in the inclined direction of the connection portion when viewed from the connection portion .
Further, the present invention
With a rotary electric machine,
A housing for accommodating the rotary electric machine and
The power converter that controls the rotary electric machine and
A vehicle drive unit including a power cable for connecting the power converter and a power source.
The housing is provided with a guide portion for accommodating and guiding a part of the power cable.
A part of the power cable is routed along the guide portion, and at the same time,
The power cable extends from the center side in the vehicle width direction to the outside of the guide portion with respect to the connection portion between the power cable and the power converter.
The guide unit
A guide portion main body having a substantially U-shaped cross section having an inlet of the power cable, an outlet of the power cable, and an opening connecting the inlet and the outlet.
A guide cover for covering the opening is provided.
The guide portion has a cable fixing portion for fixing the power cable inside.
The cable fixing portion has a ring shape surrounding the power cable and has a ring shape.
The cable fixing portion is inserted through the opening and engaged with the inner peripheral surface of the guide portion main body, or is press-fitted into the guide portion main body.
The guide portion is provided with a stopper inside which comes into contact with the cable fixing portion.

According to the present invention, it is possible to suppress the influence of the rocking of the vehicle on the power cable connecting the power converter and the power supply.

It is a block diagram which shows the power system of the hybrid vehicle which mounts the drive unit for a vehicle in one Embodiment of this invention. It is a perspective view of the drive unit for a vehicle in one Embodiment of this invention. It is a top view of the drive unit for a vehicle shown in FIG. It is a side view of the drive unit for a vehicle shown in FIG. It is a rear view of the drive unit for a vehicle shown in FIG. It is a main part perspective view of the drive unit for a vehicle shown in FIG. FIG. 5 is a cross-sectional view taken along the line AA of FIG. FIG. 5 is a cross-sectional view taken along the line BB of FIG. It is explanatory drawing about the amplitude of the drive unit for a vehicle with the rocking of a vehicle.

Hereinafter, an embodiment of a hybrid vehicle equipped with the vehicle drive unit of the present invention will be described with reference to the accompanying drawings. In the following description, the drawings shall be viewed in the direction of the reference numerals, and the front / rear, left / right, and up / down shall be described according to the direction seen from the driver of the vehicle. The left side is L, the right side is R, the upper side is U, and the lower side is D.

<Hybrid vehicle>
As shown in FIG. 1, the hybrid vehicle (hereinafter, simply referred to as “vehicle”) 1 includes a vehicle drive unit 10, a high-voltage battery BATh, a converter CONV, a low-voltage battery BATl, a voltage control unit VCU, and the like. It includes one inverter INV1, a second inverter INV2, and a control device 14. In FIG. 1, a thick solid line indicates a mechanical connection, a double solid line indicates a power wiring, and a thin solid line indicates a control line (including a signal line).

The vehicle drive unit 10 includes a first rotary electric machine 12 (MOT) and a second rotary electric machine 13 (GEN), which are vector-controlled three-phase embedded magnet structure rotary electric machines, an engine ENG, and a driving force transmission. A state switching unit 15 and a speed reducer D are provided.

The driving force transmission state switching unit 15 includes a clutch that directly connects the engine ENG and the speed reducer D. A transmission or a fixed gear stage may be provided between the clutch and the speed reducer D.

The engine ENG drives the second rotary electric machine 13 as a generator. In this case, the second rotary electric machine 13 is driven by the rotational power of the engine ENG to generate electric power.

Further, the engine ENG is driven by a second rotary electric machine 13 that operates as an electric machine when the vehicle 1 is braked, and may also function as a mechanical load in which the crank shaft rotates in an idle state.

The first rotary electric machine 12 for driving the vehicle 1 operates (powers) as an electric motor by supplying electric power from at least one of the high-pressure battery BATh and the second rotary electric machine 13, and generates torque for the vehicle 1 to travel. The torque generated by the first rotary electric machine 12 is transmitted to the wheels W as a driving force via the speed reducer D. Further, the first rotary electric machine 12 operates as a generator when the vehicle 1 is braked.

The high voltage battery BATh has a plurality of storage cells connected in series and supplies a high voltage of, for example, 100-300 [V]. The storage cell is, for example, a cell of a lithium ion battery or a nickel hydrogen battery. The high voltage battery BATh may be a capacitor.

The converter CONV is a DC / DC converter that steps down the DC output voltage of the high-voltage battery BATh as it is.

The low-voltage battery BATl stores a voltage stepped down by the converter CONV, supplies a constant voltage of, for example, 12 [V] to an electrical component 18 such as a light included in the auxiliary machine 16, and also supplies a DC power source such as a control device 14. Will be done.

The voltage control unit VCU boosts the V1 voltage, which is the output voltage of the high-voltage battery BATh, to the V2 voltage, which is the input voltage for the first rotary electric machine 12 when the first rotary electric machine 12 operates as an electric machine.

Further, the voltage control unit VCU lowers the V2 voltage, which is the output voltage of the first rotary electric machine 12 when the first rotary electric machine 12 operates as a generator when the vehicle 1 is braked, to a V1 voltage.

Further, the voltage control unit VCU steps down the V2 voltage generated by the second rotary electric machine 13 and converted into direct current by driving the engine ENG to obtain the V1 voltage.

That is, the voltage control unit VCU functions as a buck-boost converter (bidirectional voltage converter) between the high-voltage battery BATh, the first rotary electric machine 12, and the second rotary electric machine 13.

The electric power at the V1 voltage stepped down by the voltage control unit VCU is supplied as the electric power for driving the electric air compressor 19 included in the auxiliary machine 16 and / or the electric power for charging the high voltage battery BATh.

The first inverter INV1 converts the V2 voltage into an AC voltage and supplies a three-phase current to the first rotary electric machine 12 (power running). Further, the first inverter INV1 converts the AC voltage generated by the first rotary electric machine 12 during braking of the vehicle 1 into a V2 voltage which is a DC voltage (regeneration).

The second inverter INV2 converts the AC voltage generated by the second rotary electric machine 13 by driving the engine ENG into a V2 voltage which is a DC voltage. Further, the second inverter INV2 converts the V2 voltage, which is a DC voltage generated by the first rotary electric machine 12 when the vehicle 1 is braked, and converted by the first inverter INV1, into an AC voltage, and converts the three-phase current into the second rotary electric machine 13. It may be supplied to.

The control device 14 performs vector control of the first inverter INV1, the first rotary electric machine 12, the second inverter INV2, the second rotary electric machine 13, and the voltage control unit VCU, as well as the engine ENG, the driving force transmission state switching unit 15, and the control device 14. The auxiliary machine 16 is controlled.

In this vehicle 1, the driving force transmission state switching unit 15 and the mechanical connection extending from the driving force transmission state switching unit 15 to both sides are wheeled through the speed reducer D via the driving force transmission state switching unit 15 with the engine ENG as a power source. It is used only when driving W. At the time of acceleration, the engine ENG and the first rotary electric machine 12 can be used.

<Configuration of vehicle drive unit>
As shown in FIGS. 2 to 4, the vehicle drive unit 10 is unitized so that the engine ENG and the rotary electric machine unit 11 are adjacent to each other in the left-right direction, and are arranged in the engine room. The rotary electric machine unit 11 includes a first rotary electric machine 12 and a second rotary electric machine 13, a housing 60 for accommodating the first rotary electric machine 12 and the second rotary electric machine 13, and a first rotary electric machine 12 and a second rotary electric machine 13. A power converter 200 for controlling is provided. The rotation axes of the first rotary electric machine 12 and the second rotary electric machine 13 are arranged in parallel, and both extend in the left-right direction. The power converter 200 includes a first inverter INV1, a second inverter INV2, and a voltage control unit VCU in FIG. 1.

As shown in FIG. 3, the vehicle drive unit 10 is supported by a pair of vehicle skeleton members 2 via a bracket 3 on the left end portion 10a side and the right end portion 10b side in the vehicle width direction (left-right direction) of the vehicle 1. As a result, the housing 60 is directly or indirectly fixed to the pair of vehicle skeleton members 2. The power converter 200 is mounted above the housing 60. The high-voltage battery BATh is arranged, for example, under the seat in the vehicle interior or under the vehicle interior.

As shown in FIGS. 3 to 6, the vehicle drive unit 10 includes a power cable 300 for connecting the power converter 200 and the high-voltage battery BATh. The power cable 300 is connected to the power converter 200 by connecting the cable-side connector 301 to the converter-side connector 201. In other words, the cable-side connector 301 of the power cable 300 and the converter-side connector 201 of the power converter 200 constitute a connection portion 100 between the power cable 300 and the power converter 200. The cable-side connector 301 is arranged on the left end portion 10a side (left side in this embodiment) in the vehicle width direction (left-right direction).

The housing 60 is provided with a guide portion 400 that accommodates and guides a part of the power cable 300. The guide portion 400 is configured separately from the housing 60, and is fixed to the back surface (rear surface) of the housing 60 by using a plurality of (four in this embodiment) bolts 411 as shown in FIG. ing. The guide portion 400 has an upper end portion 400a arranged so as to accommodate the power cable 300 by covering at least a part of the cable side connector 301, and a lower end portion 400b arranged on the center side in the vehicle width direction. That is, the upper end portion 400a of the guide portion 400 is located on the left end portion 10a side of the vehicle drive unit 10, and the lower end portion 400b is located on the center side of the vehicle drive unit 10.

As shown in FIGS. 5 and 6, in the power cable 300, at least a part of the cable-side connector 301 is arranged in the upper end portion 400a of the guide portion 400, and the power cable 300 extending from the cable-side connector 301 is connected to the guide portion 400. The cables are arranged diagonally toward the center in the width direction of the vehicle. The power cable 300 extends outward from the lower end portion 400b of the guide portion 400 toward a center tunnel (not shown).

In this way, the power cable 300 routed along the guide portion 400 extends from the central side in the vehicle width direction to the outside of the guide portion 400 with respect to the connection portion 100 between the power cable 300 and the power converter 200. Therefore, the power cable 300 is exposed to the outside from a place where the influence of the shaking of the housing 60 is small. As a result, it is possible to prevent the power cable 300 from being affected by the swing.

Here, the guide portion 400 is preferably made of a metal having electromagnetic wave shielding performance such as aluminum and iron. As a result, the electromagnetic wave generated from the power cable 300 can be reduced, and the electromagnetic wave noise can be suppressed.

Further, since the guide portion 400 is configured separately from the housing 60 and is attached to the outer surface of the housing 60, the guide portion 400 can be retrofitted to the housing 60.

Next, the configuration of the guide unit 400 will be described in more detail with reference to FIGS. 6 to 8.
The guide portion 400 has a guide portion main body 410 having a substantially U-shaped cross section having an inlet 401 of the power cable 300, an outlet 402 of the power cable 300, and an opening 403 connecting the inlet 401 and the outlet 402, and an opening. A guide portion cover 420 that covers the 403 is provided. According to this configuration, after a part of the power cable 300 is housed in the guide portion main body 410, the guide portion cover 420 is attached to the guide portion main body 410 to cover the opening 403, whereby the power cable 300 is connected to the guide portion 400. Can be easily accommodated.

The guide portion 400 has a cable fixing portion 430 for fixing the power cable 300 inside the guide portion 400. The cable fixing portion 430 has a ring shape surrounding the power cable 300, is inserted into the guide portion main body 410 through the opening 403, and is engaged with the inner peripheral surface 410a of the guide portion main body 410. Two convex portions 431 having a semicircular cross section are provided on the outer peripheral surface of the cable fixing portion 430, and concave portions 412 that engage with the two convex portions 431 are provided on the inner peripheral surface 410a of the guide portion main body 410. There is. Therefore, by engaging the two convex portions 431 of the cable fixing portion 430 with the concave portions 412 of the guide portion main body 410, the power cable 300 is fixed to the guide portion main body 410 via the cable fixing portion 430. Further, inside the guide portion main body 410, a stopper 440 that comes into contact with the cable fixing portion 430 is provided.

According to the above configuration, the power cable 300 can be fixed inside the guide portion 400 by the cable fixing portion 430. Since the cable fixing portion 430 is inserted into the guide portion main body 410 from the opening 403 and engaged with the inner peripheral surface 410a of the guide portion main body 410, the cable fixing portion 430 can be easily fixed to the guide portion 400. .. Further, since the stopper 440 is provided inside the guide portion main body 410, the cable fixing portion 430 can be easily positioned inside the guide portion 400.

FIG. 9 conceptually shows the difference in amplitude depending on the position of the vehicle drive unit 10 in the vehicle width direction.
As shown in FIG. 9, in the vehicle drive unit 10, the left end portion 10a side and the right end portion 10b side in the vehicle width direction are in opposite phases in the vertical direction and the front-rear direction due to the vibration of the vehicle 1 and the vehicle drive unit 10. fluctuate. Therefore, the amplitude of the vehicle drive unit 10 is maximum at the left end portion 10a and the right end portion 10b in the vehicle width direction, and becomes smaller toward the center side in the vehicle width direction. In the present embodiment, a part of the power cable 300 extending from the cable-side connector 301 connected to the power converter 200 arranged on the left end portion 10a side in the vehicle width direction is along the guide portion 400 attached to the housing 60. Since the power cable 300 is guided to the center side in the vehicle width direction and extends from the center side in the vehicle width direction to the outside of the guide portion 400 from the cable side connector 301, the power cable 300 swings the vehicle 1. That is, it is possible to effectively suppress the influence of the phase difference between the vibration of the vehicle drive unit 10 and the vibration of the vehicle body of the vehicle 1. In other words, the power cable 300 can easily absorb the phase difference between the vibration of the vehicle drive unit 10 and the vibration of the vehicle body of the vehicle 1.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.
For example, in the present embodiment, after the guide portion 400 and the housing 60 are separately formed, the guide portion 400 is attached to the outer surface of the housing 60, but the guide portion 400 is integrally formed with the housing 60. You may. By forming the guide portion 400 integrally with the housing 60, the number of parts can be reduced.

Further, even when the guide portion 400 is separated from the housing 60, the structure of the guide portion 400 is not limited to the above embodiment, and for example, after the power cable 300 is laid on the surface of the housing 60, the guide portion 400 is laid on the surface of the housing 60. The guide portion 400 may be attached to the housing 60 so as to cover the power cable 300.

Further, in the present embodiment, the cable fixing portion 430 is configured to be engaged with the inner peripheral surface 410a of the guide portion main body 410, but the cable fixing portion 430 may be press-fitted into the guide portion main body 410 and fixed.

In addition, at least the following matters are described in this specification. The components and the like corresponding to the above-described embodiments are shown in parentheses, but the present invention is not limited thereto.

(1) Rotating electric machine (first rotating electric machine 12) and
A housing (housing 60) for accommodating the rotary electric machine and
A power converter (power converter 200) that controls the rotary electric machine, and
A vehicle drive unit (vehicle drive unit 10) including a power cable (power cable 300) for connecting the power converter and a power source (high voltage battery BATh).
The housing is provided with a guide unit (guide unit 400) that accommodates and guides a part of the power cable.
A part of the power cable is routed along the guide portion, and at the same time,
The power cable is a vehicle drive unit extending from the center side in the vehicle width direction of the connection portion (connection portion 100) between the power cable and the power converter to the outside of the guide portion.

According to (1), the power cable routed along the guide portion extends from the center side in the vehicle width direction to the outside of the guide portion from the connection portion between the power cable and the power converter. The power cable can be extended from a place where the influence of shaking is small. This makes it possible to prevent the power cable from being affected by the rocking of the vehicle. Further, since a part of the power cable is guided while being housed in the guide portion, electromagnetic noise can be suppressed.

(2) The vehicle drive unit according to (1).
The guide portion is a vehicle drive unit attached to the outside of the housing.

According to (2), since the guide portion is attached to the outside of the housing, the guide portion can be retrofitted.

(3) The vehicle drive unit according to (1).
The guide portion is a vehicle drive unit integrally formed with the housing.

According to (3), the number of parts can be reduced by forming the guide portion integrally with the housing.

(4) The vehicle drive unit according to any one of (1) to (3).
The guide unit
A guide body having a substantially U-shaped cross section having an inlet (inlet 401) of the power cable, an outlet (outlet 402) of the power cable, and an opening (opening 403) connecting the inlet and the outlet. (Guide body 410) and
A vehicle drive unit including a guide portion cover (guide portion cover 420) that covers the opening.

According to (4), the power cable can be easily accommodated in the guide portion by attaching the guide portion cover after accommodating the power cable in the guide portion main body.

(5) The vehicle drive unit according to (4).
The guide portion is a vehicle drive unit having a cable fixing portion (cable fixing portion 430) for fixing the power cable inside.

According to (5), the power cable can be fixed inside the guide portion by the cable fixing portion.

(6) The vehicle drive unit according to (5).
The cable fixing portion has a ring shape surrounding the power cable and has a ring shape.
The cable fixing portion is a vehicle drive unit that is inserted through the opening and is engaged with the inner peripheral surface (inner peripheral surface 410a) of the guide portion main body or is press-fitted into the guide portion main body.

According to (6), the cable fixing portion is inserted through the opening and engaged with the inner peripheral surface of the guide portion main body, or is press-fitted into the guide portion main body, so that the cable fixing portion can be easily attached to the guide portion. Can be fixed.

(7) The vehicle drive unit according to (6).
The guide portion is a vehicle drive unit provided with a stopper (stopper 440) that comes into contact with the cable fixing portion inside.

According to (7), the cable fixing portion can be easily positioned inside the guide portion.

(8) The vehicle drive unit according to any one of (1) to (7).
The housing is directly or indirectly fixed to the vehicle skeleton member (vehicle skeleton member 2) on one end (left end 10a) side and the other end (right end 10b) side in the vehicle width direction.
The power converter is a vehicle drive unit arranged above the housing.

According to (8), since the housing is directly or indirectly fixed to the vehicle skeleton member on one end side and the other end side in the vehicle width direction, the housing swings with respect to the vehicle skeleton member. At this time, it is possible to prevent the power cable from being affected by the swing of the housing.

2 Vehicle skeleton member 10 Vehicle drive unit 10a Left end (one end)
10b Right end (other end)
12 1st rotary electric machine 60 Housing 100 Connection part 200 Power converter 300 Power cable 400 Guide part 401 Entrance 402 Exit 403 Opening part 410 Guide part main body 410a Inner peripheral surface 420 Guide part cover 430 Cable fixing part 440 Stopper BATh High voltage battery ( power supply)

Claims (9)

With a rotary electric machine,
A housing for accommodating the rotary electric machine and
The power converter that controls the rotary electric machine and
A vehicle drive unit including a power cable for connecting the power converter and a power source.
The housing is provided with a guide portion for accommodating and guiding a part of the power cable.
A part of the power cable is routed along the guide portion, and at the same time,
The power cable extends from the center side in the vehicle width direction to the outside of the guide portion with respect to the connection portion between the power cable and the power converter .
The guide portion has an inlet of the power cable and an outlet of the power cable.
The connection portion is inclined toward the inlet of the guide portion with respect to the outer surface of the power converter in which the connection portion is located.
The entrance of the guide portion is a vehicle drive unit provided in the inclined direction of the connection portion when viewed from the connection portion . The vehicle drive unit according to claim 1.
The guide portion is a vehicle drive unit attached to the outside of the housing. The vehicle drive unit according to claim 1.
The guide portion is a vehicle drive unit integrally formed with the housing. The vehicle drive unit according to any one of claims 1 to 3.
The guide unit
A guide portion main body having a substantially U-shaped cross section having an opening connecting the inlet and the outlet,
A vehicle drive unit comprising a guide cover for covering the opening. The vehicle drive unit according to claim 4.
The guide portion is a vehicle drive unit having a cable fixing portion for fixing the power cable inside. The vehicle drive unit according to claim 5.
The cable fixing portion has a ring shape surrounding the power cable and has a ring shape.
The cable fixing portion is a vehicle drive unit that is inserted through the opening and is engaged with the inner peripheral surface of the guide portion main body or is press-fitted into the guide portion main body. With a rotary electric machine,
A housing for accommodating the rotary electric machine and
The power converter that controls the rotary electric machine and
A vehicle drive unit including a power cable for connecting the power converter and a power source.
The housing is provided with a guide portion for accommodating and guiding a part of the power cable.
A part of the power cable is routed along the guide portion, and at the same time,
The power cable extends from the center side in the vehicle width direction to the outside of the guide portion with respect to the connection portion between the power cable and the power converter.
The guide unit
A guide portion main body having a substantially U-shaped cross section having an inlet of the power cable, an outlet of the power cable, and an opening connecting the inlet and the outlet.
A guide cover for covering the opening is provided.
The guide portion has a cable fixing portion for fixing the power cable inside.
The cable fixing portion has a ring shape surrounding the power cable and has a ring shape.
The cable fixing portion is inserted through the opening and engaged with the inner peripheral surface of the guide portion main body, or is press-fitted into the guide portion main body.
The guide portion is a vehicle drive unit provided with a stopper that comes into contact with the cable fixing portion inside. The vehicle drive unit according to any one of claims 1 to 7.
The housing is directly or indirectly fixed to the vehicle skeleton member on one end side and the other end side in the vehicle width direction.
The power converter is a vehicle drive unit arranged above the housing. The vehicle drive unit according to claim 4.
The guide portion cover is a vehicle drive unit that covers the opening and the connection portion.

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