Patent Description:
In recent years, for the purpose of decreasing environmental loads and so forth, hybrid vehicles have been spreading which include a motor as a drive source for vehicle traveling in addition to an engine.

<CIT> discloses a vehicle including an engine and a motor as drive sources for vehicle traveling. In the vehicle disclosed in <CIT>, the engine is a four-cylinder engine and is installed in the vehicle by longitudinal placement in which the cylinders are arrayed in a vehicle front-rear direction. The motor is arranged in the rear with respect to the engine in the vehicle front-rear direction and is connected with an output shaft of the engine via a clutch. A transmission is arranged further in the rear of the motor. <CIT> discloses a transmission which is not arranged adjacent to the electric motor but is separated therefrom by the propeller shaft.

In the vehicle disclosed in <CIT>, an electric power conversion apparatus including an inverter is mounted on a side portion of a transmission casing in the transmission. Direct-current electric power from a battery is converted to alternating-current electric power by the inverter and supplied to the motor.

However, a vehicle disclosed in <CIT> of above has a problem that because of an electric power conversion apparatus mounted on a side portion of a transmission, an occupant space becomes narrow in a vehicle width direction. That is, in a case where a longitudinal engine is employed, the transmission is arranged below a floor tunnel, and in a case where the electric power conversion apparatus is mounted on the side portion of a transmission casing, the width (the dimension in the vehicle width direction) of the floor tunnel needs to be increased by the size of the electric power conversion apparatus.

In a case where the width of the floor tunnel is increased, foot spaces of occupants including a driver are influenced. Consequently, in the vehicle of the above <CIT> which employs a structure in which the electric power conversion apparatus is mounted on the side portion of the transmission casing, the positions of pedals to be operated by the driver have to be arranged to be offset to positions deviated from ergonomically ideal positions. Thus, in a case where the driver drives the vehicle disclosed in the <CIT>, fatigue of the driver may be increased.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle that can reduce an influence on an occupant space due to arrangement of an inverter.

A vehicle according to one aspect of the present invention includes the features of claim 1More particularly, the inverter may be positioned between an upper portion of the floor panel defining said floor tunnel and said upper portion of the transmission casing. In other words, the inverter may be mounted in said floor tunnel at a region below an upper portion of the floor panel defining the floor tunnel and above the upper portion of the transmission casing.

In the vehicle according to the above aspect, the inverter is mounted on the upper portion of the transmission casing below the floor tunnel. Thus, in the vehicle according to the above aspect, compared to a vehicle which is disclosed in the <CIT> and in which an electric power conversion apparatus such as an inverter is mounted on a side portion of a transmission casing, the width (the dimension in a vehicle width direction) of the floor tunnel can be inhibited from being increased. Consequently, in the vehicle according to the above aspect, a foot space of an occupant is less likely to be constricted, and the positions of pedals to be operated by a driver are easily arranged in ergonomically ideal positions. Thus, in the vehicle according to the above aspect, the driver is less likely to be fatigued.

In the vehicle according to the above aspect, the motor may have a rotor, a stator, and a motor casing housing the rotor and the stator, and the upper portion of the transmission casing may be placed in a lower position in a vehicle up-down direction than an upper end portion in an outer peripheral surface of the motor casing.

In the vehicle according to the above aspect, the upper portion of the transmission casing is placed in a lower position than the upper end portion in the outer peripheral surface of the motor casing. Consequently, in the vehicle according to the above aspect, the inverter is arranged by effectively using a level difference between the upper end portion in the outer peripheral surface of the motor casing and the upper portion of the transmission casing, and arrangement of the inverter with high space efficiency can thereby be realized.

In the vehicle according to the above aspect, when an imaginary line in parallel with an axis of a rotation shaft in the motor is drawn from the upper end portion of the outer peripheral surface of the motor casing, the inverter may be arranged to fall within a portion below the imaginary line.

In the vehicle according to the above aspect, because the inverter is arranged to fall within a portion below the imaginary line, a situation can be avoided in which the floor tunnel protrudes upward in a portion in which the inverter is arranged. Consequently, in the vehicle according to the above aspect, in a vehicle cabin, a space for a section (a front console, a center console) arranged above the floor tunnel can be inhibited from being constricted.

In the vehicle according to the above aspect, an exhaust pipe that is connected with the longitudinal engine, guides exhaust gas exhausted from the longitudinal engine to a vehicle rear side, and discharges the exhaust gas, and a front propeller shaft for transmitting a driving force output from the transmission to a front wheel may further be included, and around the transmission casing, the exhaust pipe may be arranged on one lateral side in a vehicle width direction and the front propeller shaft may be arranged on another lateral side in the vehicle width direction.

In the vehicle according to the above aspect, although the exhaust pipe is arranged on one lateral side of the transmission casing and the front propeller shaft is arranged on the other lateral side, the inverter can be prevented from interfering with those. That is, because the inverter is mounted on the upper portion of the transmission casing, interference with the exhaust pipe and the front propeller shaft can be avoided. Further, the inverter is mounted on the upper portion of the transmission casing, the exhaust pipe is arranged on the lateral side of the transmission casing, and heat from the exhaust pipe can thereby also be inhibited from influencing the inverter.

In the vehicle according to the above aspect, the transmission may further have an oil pan that is mounted on a lower portion of the transmission casing and is for storing hydraulic oil.

In the vehicle according to the above aspect, although the oil pan is mounted on the lower portion of the transmission casing, the inverter is mounted on the upper portion of the transmission casing, and interference between the inverter and the oil pan can thus also be avoided.

In the vehicle according to the above aspect, a DC-DC converter that converts a voltage of input direct-current electric power and outputs the direct-current electric power to a load of the vehicle may further be included, and the DC-DC converter may be arranged below the floor panel and in a region adjacent to the floor tunnel in a vehicle width direction.

In the vehicle according to the above aspect, the DC-DC converter is arranged in the region adjacent to the floor tunnel, and the width of the floor tunnel thereby does not need to be increased for disposing the DC-DC converter. Note that the DC-DC converter does not output electric power to the motor and thus does not necessarily need to be arranged in a vicinity region of the motor. Consequently, as described above, the DC-DC converter is capable of being arranged in the region adjacent to the floor tunnel.

In the vehicle according to the above aspect, an engine room may be provided in a front portion of the vehicle, the floor tunnel may be provided to extend from the engine room toward a vehicle rear side, and the longitudinal engine and the motor may be installed in the engine room provided in the front portion of the vehicle.

In the vehicle according to the above aspect, the longitudinal engine and the motor are installed in the engine room in the front portion of the vehicle. In this form, although the transmission arranged below the floor tunnel is positioned around foot parts of front seats, the inverter is mounted on the upper portion of the transmission casing as described above, and it thereby becomes possible to inhibit foot spaces of occupants (such as a driver) to be seated on the front seats from being constricted.

A vehicle according to each of the above aspects can reduce an influence on an occupant space due to arrangement of an inverter.

An embodiment of the present invention will hereinafter be described with reference to drawings. Note that the embodiment described in the following is one example of the present invention, and the present invention is not limited by the following embodiment at all except inherent configurations of the present invention.

In the drawings used in the following description, "FR" denotes the vehicle front side, "RE" denotes the vehicle rear side, "UP" denotes the vehicle upper side, "LO" denotes the vehicle lower side, "RI" denotes the vehicle right side, and "LE" denotes the vehicle left side.

An outline configuration of a vehicle <NUM> according to the present embodiment will be described by using <FIG>.

As illustrated in <FIG>, the vehicle <NUM> includes an engine <NUM> and a motor <NUM> as drive sources for vehicle traveling. The engine <NUM> and the motor <NUM> are installed in an engine room 1a provided in a front portion of the vehicle <NUM>. The engine <NUM> has plural cylinders 10a and is arranged by longitudinal placement such that the plural cylinders 10a are aligned in a front-rear direction of the vehicle <NUM>. That is, in the present embodiment, the engine <NUM> is a longitudinal engine or an inline engine with longitudinal installation. The cylinders 10a may be arranged in one or two rows substantially parallel to the front rear direction of the vehicle and may have substantially upright cylinder access.

Note that the vehicle <NUM> according to the present embodiment is capable of employing either one of a gasoline engine and a diesel engine as the engine <NUM>.

The motor <NUM> is arranged in the rear with respect to the engine <NUM> in the front-rear direction of the vehicle <NUM>. Furthermore, a rotation shaft of the motor <NUM> is coupled with an output shaft of the engine <NUM> via a damper <NUM>. Either one or both of the engine <NUM> and the motor <NUM> generate a driving force for vehicle traveling in accordance with a traveling condition of the vehicle <NUM>. Note that the damper <NUM> provided between the engine <NUM> and the motor <NUM> is a device for buffering an impact torque between the engine <NUM> and the motor <NUM>.

The vehicle <NUM> also includes a transmission <NUM>, a transfer case <NUM>, propeller shafts <NUM> and <NUM>, differential gears <NUM> and <NUM>, drive shafts <NUM> and <NUM>, and wheels <NUM>, <NUM>, <NUM>, and <NUM>. The transmission <NUM> is coupled with the motor <NUM>. To the transmission <NUM>, in addition to the driving force from the motor <NUM>, the driving force from the engine <NUM> is also input through the motor <NUM>. The transmission <NUM> changes the speed of the driving force at a ratio corresponding to the traveling condition and outputs the driving force to the transfer case <NUM>.

Note that the vehicle <NUM> according to the present embodiment is capable of employing either one of a manual transmission and an automatic transmission as the transmission <NUM>.

The transfer case <NUM> is a motive power division apparatus and is a device that divides the driving force output from the transmission <NUM> into a driving force for front wheels <NUM> and <NUM> and a driving force for rear wheels <NUM> and <NUM>. With the transfer case <NUM>, a rear (R) propeller shaft <NUM> and a front (F) propeller shaft <NUM> are coupled.

Note that the ratio of distribution of the driving forces by the transfer case <NUM> may successively be changed in accordance with a road surface µ or the like.

The R propeller shaft <NUM> is provided to extend rearward from the transfer case <NUM> in a vehicle front-rear direction. A back end of the R propeller shaft <NUM> is coupled with a rear (R) differential gear <NUM>. A rear (R) drive shaft <NUM> extends from the R differential gear <NUM> toward both sides in a vehicle width direction. The rear wheels <NUM> and <NUM> are mounted on both ends of the R drive shaft <NUM>.

The F propeller shaft <NUM> is provided to extend forward in the vehicle front-rear direction through a lateral side of the transmission <NUM>, the motor <NUM>, and the damper <NUM> in the vehicle width direction. A front end of the F propeller shaft <NUM> is coupled with a front (F) differential gear <NUM>. A front (F) drive shaft <NUM> extends from the F differential gear <NUM> toward both sides in the vehicle width direction. The front wheels <NUM> and <NUM> are mounted on both ends of the F drive shaft <NUM>.

In addition, the vehicle <NUM> includes a battery <NUM> and an electric power conversion unit <NUM>. The battery <NUM> is a battery module configured with plural batteries each of which is a lithium-ion battery. The electric power conversion unit <NUM> is connected with the battery <NUM>.

The electric power conversion unit <NUM> has an inverter <NUM> and a DC-DC converter <NUM>. The inverter <NUM> is a device that converts direct-current electric power input from the battery <NUM> to alternating-current electric power and outputs the electric power to the motor <NUM>. The DC-DC converter <NUM> is a device that converts (steps up or down) a voltage of the direct-current electric power input from the battery <NUM> and outputs the electric power to various kinds of loads of the vehicle <NUM>.

The transmission <NUM> and a peripheral structure thereof in the vehicle <NUM> will be described by using <FIG>.

As illustrated in <FIG>, the motor <NUM> has a motor casing 12a, and the transmission <NUM> has a transmission casing 13a. The motor casing 12a is a tubular outer shell member and houses a rotor and a stator (not illustrated) in an internal portion. The transmission casing 13a is a tubular outer shell member which has a smaller diameter and is longer than the motor casing 12a and houses a transmission mechanism (not illustrated) in an internal portion.

The inverter <NUM> is mounted on an upper portion of the transmission casing 13a. The inverter <NUM> is arranged to fall within the upper portion of the transmission casing 13a in the vehicle front-rear direction. That is, the inverter <NUM> is arranged not to stick out from the transmission casing 13a in the vehicle front-rear direction and the vehicle width direction.

As illustrated in <FIG> and <FIG>, a terminal block <NUM> is mounted on a region from the upper portion of the transmission casing 13a to an upper portion of the motor casing 12a. The terminal block <NUM> is a member which houses a terminal and a bus bar for electrically connecting the inverter <NUM> and the motor <NUM> together.

As illustrated in <FIG>, the DC-DC converter <NUM> is set apart from the transmission casing 13a on one lateral side in the vehicle width direction and is placed below a lower portion of the transmission casing 13a in a vehicle up-down direction. An arrangement form of the DC-DC converter <NUM> will be described later.

The F propeller shaft <NUM> is disposed in a state where a gap or a recess or an indentation is provided with respect to the transmission casing 13a and the motor casing 12a. More particularly, the transmission casing 13a and/or the motor casing 12a may be provided with a trough-like concavity or an elongated indentation extending in the front rear direction at a side of the transmission casing 13a and/or motor casing 12a, wherein the F propeller shaft <NUM> may be arranged at least partly in the space surrounded by such concavity/indentation. When considering an imaginary vertical plane extending in the front rear direction of the vehicle and touching the transmission casing 13a and/or the motor casing 12a at a side thereof, the F propeller shaft <NUM> may be arranged, at least partly, between such imaginary vertical plane and the transmission casing 13a and/or the motor casing 12a. The F propeller shaft <NUM> is arranged on the same side as the side in the vehicle width direction on which the DC-DC converter <NUM> is arranged. The F propeller shaft <NUM> is arranged in a region closer to the transmission casing 13a and so forth than the DC-DC converter <NUM>. More particularly, the F propeller shaft <NUM> may be arranged at a height level above the DC-DC converter <NUM>. Irrespective of the height arrangement, when considering a top view of the motor and transmission along a vertical axis of view, the F propeller shaft <NUM> may be arranged between the DC-DC converter <NUM> and the transmission/motor casing 13a/12a.

As illustrated in <FIG>, an exhaust pipe <NUM> is arranged in a lateral side region on an opposite side, with respect to the transmission casing 13a, to a side in the vehicle width direction on which the DC-DC converter <NUM> and the F propeller shaft <NUM> are arranged. Although not illustrated in detail, the exhaust pipe <NUM> is connected with an exhaust manifold of the engine <NUM> and is provided to extend rearward in the vehicle front-rear direction.

As illustrated in <FIG>, an oil pan <NUM> is mounted on the lower portion of the transmission casing 13a. The oil pan <NUM> is a container for storing hydraulic oil of the transmission <NUM>.

A description will be made about arrangement of the transmission <NUM> and the inverter <NUM> in a floor tunnel 1d by using <FIG> and <FIG>.

As illustrated in <FIG>, in the vehicle <NUM>, the engine room 1a is partitioned from a vehicle cabin by a dash panel 1b. A floor panel 1c continuous with the dash panel 1b is provided in a lower portion of the vehicle cabin. Furthermore, in a central region of the floor panel 1c in the vehicle width direction, the floor tunnel 1d is provided which bulges upward (toward a vehicle cabin inside) in the vehicle up-down direction and extends in the vehicle front-rear direction.

In the vehicle <NUM>, the engine <NUM>, the damper <NUM>, and the motor <NUM> are arranged in the engine room 1a. The transmission <NUM> and the inverter <NUM> are arranged below the floor tunnel 1d.

Here, as illustrated in <FIG>, in the vehicle up-down direction, an upper portion 13b of the transmission casing 13a is placed in a lower position than an upper end portion 12b in an outer peripheral surface of the motor casing 12a. That is, a level difference G is provided in the vehicle up-down direction between the upper portion 13b of the transmission casing 13a and the upper end portion 12b in the outer peripheral surface of the motor casing 12a. In the vehicle <NUM> according to the present embodiment, the inverter <NUM> is arranged by effectively using the level difference G. More particularly, a bottom side of the inverter <NUM> may be arranged lower than said upper end portion 12b of the motor casing 12a. Furthermore, depending on the thickness or height of the inverter <NUM>, a top side of said inverter <NUM> may be arranged lower than said upper end portion 12b or substantially at the same height as said upper end portion 12b or higher than said upper end portion 12b.

In addition, when an imaginary line LN12 in parallel with an axis Ax12 of the rotation shaft (not illustrated) of the motor <NUM> is drawn from the upper end portion 12b in the outer peripheral surface of the motor casing 12a, the inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a such that in the vehicle up-down direction, the inverter <NUM> falls within a portion below the imaginary line LN12 in the vehicle up-down direction. In the vehicle <NUM> according to the present embodiment, because the inverter <NUM> is arranged to fall within the level difference G in the vehicle up-down direction, the floor tunnel 1d does not need to be partially swollen to protrude upward in a portion in which the inverter <NUM> is arranged. Consequently, in the vehicle <NUM>, in the vehicle cabin, a space for a section (a front console, a center console) 1e arranged above the floor tunnel 1d can be inhibited from being constricted.

Note that as illustrated in <FIG>, the oil pan <NUM> is mounted on a lower portion 13c of the transmission casing 13a and thus does not influence the floor tunnel 1d.

A description will be made about the arrangement relationship between the DC-DC converter <NUM>, the exhaust pipe <NUM>, and the oil pan <NUM> and the inverter <NUM> by using <FIG>.

As illustrated in <FIG>, in the vehicle <NUM>, the inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a below the floor tunnel 1d. Thus, in the vehicle <NUM>, compared to a case where the inverter <NUM> is placed on a lateral side 1f or <NUM> in the vehicle width direction by mounting the inverter <NUM> on a side portion of the transmission casing 13a, the dimension (width) of the floor tunnel 1d in the vehicle width direction does not have to be increased.

The F propeller shaft <NUM> is arranged below the floor tunnel 1d and on the lateral side <NUM> of the transmission casing 13a. Meanwhile, the inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a and thus does not interfere with the F propeller shaft <NUM>.

The DC-DC converter <NUM> is arranged below the floor panel 1c and in a left vicinity region <NUM> in the vehicle width direction with respect to the floor tunnel 1d. The inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a and thus does not interfere with the DC-DC converter <NUM>.

The exhaust pipe <NUM> is arranged below the floor panel 1c and in a right vicinity region 1i in the vehicle width direction with respect to the floor tunnel 1d. The inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a and thus does not interfere with the exhaust pipe <NUM> either. Further, the inverter <NUM> is mounted on the upper portion of the transmission casing 13b below the floor tunnel 1d and is less likely to be influenced by heat from the exhaust pipe <NUM> arranged in the right vicinity region 1i in the vehicle width direction with respect to the floor tunnel 1d.

The oil pan <NUM> is mounted on the lower portion 13c of the transmission casing 13a. The inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a and thus does not interfere with the oil pan <NUM> either.

In the vehicle <NUM> according to the present embodiment, the inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a below the floor tunnel 1d. Thus, in the vehicle <NUM>, compared to a vehicle which is disclosed in <CIT> and in which an electric power conversion apparatus such as an inverter is mounted on a side portion of a transmission casing, the width (the dimension in the vehicle width direction) of the floor tunnel 1d can be inhibited from being increased. Consequently, in the vehicle <NUM>, a foot space of an occupant is less likely to be constricted, the positions of pedals to be operated by a driver are easily arranged in ergonomically ideal positions, and the driver is less likely to be fatigued.

Further, in the vehicle <NUM> according to the present embodiment, as illustrated in <FIG>, the upper portion 13b of the transmission casing 13a is placed in a lower position than an upper end portion 13b in the outer peripheral surface of the motor casing 12a. Consequently, in the vehicle <NUM>, the inverter <NUM> is arranged by effectively using a level difference between the upper end portion 12b in the outer peripheral surface of the motor casing 12a and the upper portion 13b of the transmission casing 13a, and arrangement of the inverter with high space efficiency can thereby be realized. In particular, in the present embodiment, because the inverter <NUM> is arranged to fall within a region between the imaginary line LN12 and the upper portion 13b of the transmission casing 13a, a situation can be avoided in which the floor tunnel 1d protrudes upward in a portion in which the inverter <NUM> is arranged. Consequently, in the vehicle <NUM>, in the vehicle cabin, the space for the section (front or center console 1e) arranged above the floor tunnel 1d can be inhibited from being constricted.

Further, in the vehicle <NUM> according to the present embodiment, as illustrated in <FIG>, the exhaust pipe <NUM> is arranged in the right vicinity region 1i below the floor panel 1c, and the F propeller shaft <NUM> is arranged on the lateral side (left side) <NUM> of the transmission casing 13a below the floor tunnel 1d. Consequently, in the vehicle <NUM>, the inverter <NUM> mounted on the upper portion 13b of the transmission casing 13a can be prevented from interfering with the exhaust pipe <NUM> and the F propeller shaft <NUM>.

Further, in the present embodiment, because the inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a which is positioned apart from the exhaust pipe <NUM>, heat from the exhaust pipe <NUM> can also be inhibited from influencing the inverter <NUM>.

Further, in the vehicle <NUM> according to the present embodiment, as illustrated in <FIG> and <FIG>, although the oil pan <NUM> is mounted on the lower portion 13c of the transmission casing 13a, the inverter <NUM> is mounted on the upper portion 13b with the transmission casing 13a interposed therebetween, and interference between the inverter <NUM> and the oil pan <NUM> can thus also be avoided.

Further, in the vehicle <NUM> according to the present embodiment, as illustrated in <FIG>, the DC-DC converter <NUM> is arranged below the floor panel 1c and in the left vicinity region <NUM> adjacent to the floor tunnel 1d, and the width of the floor tunnel 1d thereby does not need to be increased for disposing the DC-DC converter <NUM>. Note that the DC-DC converter <NUM> does not output electric power to the motor <NUM> and thus does not necessarily need to be arranged in a vicinity region of the motor <NUM> (in the floor tunnel 1d). Consequently, as in the present embodiment, the DC-DC converter <NUM> is capable of being arranged in the left vicinity region <NUM>.

Further, in the vehicle <NUM> according to the present embodiment, the longitudinally placed engine (longitudinal engine) <NUM> and the motor <NUM> are installed in the engine room 1a in the front portion of the vehicle <NUM>. Thus, in the vehicle <NUM> according to the present embodiment, although the transmission <NUM> is positioned around foot parts of front seats, the inverter <NUM> is mounted on the upper portion 13b of the transmission casing 13a, and it thereby becomes possible to inhibit foot spaces of occupants (such as a driver) to be seated on the front seats from being constricted.

As described above, the vehicle <NUM> according to the present embodiment can reduce an influence on an occupant space due to arrangement of the inverter <NUM>.

In the above embodiment, as illustrated in <FIG>, the four-cylinder engine <NUM> is employed as one example, but the present invention is not limited to this. For example, it is possible to employ an engine with five or more cylinders, a V-type multi-cylinder engine, or a W-type multi-cylinder engine as well.

Further, in the above embodiment, a four-wheel drive vehicle in which the driving force generated by the engine <NUM> and the motor <NUM> is transmitted also to the front wheels <NUM> and <NUM> is raised as one example, but the present invention is not limited to this. For example, application to an FR vehicle (front-engine, rear-wheel-drive layout) is possible.

Further, in the above embodiment, as illustrated in <FIG>, the exhaust pipe <NUM> is arranged on a right side of the transmission casing 13a, and the DC-DC converter <NUM> is arranged on a left side; however, the present invention is not limited to this. For example, the exhaust pipe <NUM> may be arranged on the left side of the transmission casing 13a, and the DC-DC converter <NUM> may be arranged on the right side. Further, the DC-DC converter <NUM> does not necessarily need to be arranged below the floor panel 1c but may be arranged above the floor panel 1c.

Further, in the above embodiment, the damper <NUM> is provided between the engine <NUM> and the motor <NUM>, and as the damper <NUM>, various dampers employed for hybrid vehicles are capable of being used. For example, a damper with a limiter can also be employed which has a function of causing a slip in a case where a predetermined torque is exceeded.

Further, in the above embodiment, the electric power conversion unit <NUM> has the inverter <NUM> and the DC-DC converter <NUM>, but in the present invention, the DC-DC converter <NUM> is not an essential feature.

Claim 1:
A vehicle (<NUM>) comprising:
a longitudinal engine (<NUM>) that has plural cylinders and is installed such that the plural cylinders are arrayed in a vehicle front-rear direction;
a motor (<NUM>) that is arranged in rear with respect to the longitudinal engine (<NUM>) in the vehicle front-rear direction and is capable of generating a driving force for vehicle traveling;
a transmission (<NUM>) that has a transmission mechanism and a transmission casing (13a) housing the transmission mechanism and is coupled with the motor (<NUM>); and
an inverter (<NUM>) that converts input direct-current electric power to alternating-current electric power and outputs the alternating-current electric power to the motor (<NUM>), wherein
a floor tunnel (1d) bulging toward an inside of a vehicle cabin and extending in the vehicle front-rear direction is formed in a floor panel (1c) of the vehicle (<NUM>),
the transmission (<NUM>) is arranged in and/or below the floor tunnel (1d), and
the transmission (<NUM>) further has an oil pan (<NUM>) that is mounted on a lower portion (13c) of the transmission casing (13a) and is for storing hydraulic oil,
characterized in that,
the inverter (<NUM>) is mounted in and/or below the floor tunnel (1d) and on an upper portion (13b) of the transmission casing (13a),
the transmission (<NUM>) is adjacently arranged in rear with respect to the motor (<NUM>) in the vehicle front-rear direction, and
the transmission casing (13a) is interposed between the inverter (<NUM>) being mounted on the upper portion (13b) of the transmission casing (13a) and the oil pan (<NUM>) being mounted on the lower portion (13c) of the transmission casing (13a).