JP2017114340A - Four-wheel drive working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a four-wheel drive working vehicle in which arrangement positions of a battery and an engine are devised to arrange the battery and the engine compactly and rationally effectively using a vehicle space.SOLUTION: A four-wheel drive working vehicle comprises: an operation part including a driver's seat; a prime mover part 3 including an engine 6 and an electric motor 8; and a vehicle body frame for supporting the operation part and the prime mover part 3. The vehicle body frame is configured to integrally comprise: a front machine frame 1A for supporting a floor surface of the operation part; and a rear machine frame 1B disposed behind the front machine frame 1A at a higher position than the floor surface of the operation part. The vehicle body frame further supports the engine 6 and a transmission arranged below the rear machine frame 1B, and includes a prime mover part support frame 30 for supporting the electric motor 8. The prime mover part support frame 30 is detachably connected to the front machine frame 1A and the rear machine frame 1B.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a so-called hybrid four-wheel drive work vehicle including two systems of travel output devices, an engine constituted by an internal combustion engine and an electric motor for travel drive.

Regarding this type of four-wheel drive work vehicle, there is a conventional technique described in [1] below.
[1] There is one that can select either a charging mode in which the power of the generator driven by the engine is stored in the battery or an assist mode in which the power stored in the battery is used as power for the work device (for example, Patent Document 1).

JP 2004-242558 A (paragraph numbers “0019”, “0033”, “0048”, FIGS. 5 to 13)

  In the above [1], it is shown that a solar cell is provided on the upper surface of the threshing device instead of the generator as the battery charging means, but for supplying power to the electric motor. There is no description of where and how the battery and engine are arranged. Accordingly, there is no disclosure of a technique on how to easily install a battery, an electric motor, or an engine on a traveling machine body.

  When mounting an electric motor or a battery on a work vehicle so that not only the engine but also an electric motor can be driven, the present invention devise the arrangement position of the electric motor and the engine to It is an object of the present invention to provide a four-wheel drive work vehicle in which an engine and an electric motor can be easily incorporated.

  As a means for solving the above problems, in the four-wheel drive work vehicle according to the present invention, a driving seat is provided on a traveling machine body including a body frame supported by a pair of left and right front wheels and a pair of left and right rear wheels. And a driving unit that transmits driving force to the front wheels and the rear wheels. The driving unit includes an engine constituted by an internal combustion engine and an electric motor for driving driving. The vehicle body frame includes a front machine frame disposed to support the floor surface of the driving unit, and the front machine frame at a position higher than the floor surface of the driving unit. And a rear machine frame disposed on the rear side of the rear unit, the engine and the transmission positioned below the rear machine frame, and the electric motor. A motor support frame is provided. Moving part supporting frame, is characterized in that is detachably connected to said front machine frame and the rear machine frame.

According to the present invention, the engine is disposed in a state in which cooling by contact with the outside air is easily performed by effectively using the space existing below the rear machine casing.
And since the drive part support frame which supports this engine and transmission and supports the electric motor is detachably connected to the front machine frame and the rear machine frame, the drive part support frame is attached and detached. The disassembly and assembling work around the prime mover with respect to the traveling machine body can be easily performed.
In addition, by detaching the driving part support frame, it is advantageous in that assembly and disassembly around the engine and the electric motor and maintenance work can be performed in a state separated from the traveling machine body.

  In the present invention, the vehicle body frame includes a pair of left and right main frames that are long in the front-rear direction within the entire range of the front machine frame and the rear machine frame, and the driving part support frame has the front part on the front side. It is preferable that the rear end of the machine frame is connected to the main frame, and the rear side is connected to the main frame at the rear end of the rear machine frame.

  According to the present invention, the left and right main frames, which are strength members, are effectively used to improve the connection strength of the driving portion support frame to the vehicle body frame, and the driving strength of the driving portion support frame itself can be easily improved.

  In the present invention, the driving portion support frame includes an engine side frame portion on which the engine and the transmission are mounted, and a motor side frame portion on which the electric motor is mounted, and the engine side frame portion is The rear frame is connected to the main frame across the rear end of the front machine frame and the rear end of the rear machine frame, and the motor side frame part is connected to the front end of the engine side frame part. In addition, it is preferable that the front end portion is detachably connected to the front machine frame at a location ahead of the connection location between the rear end portion of the front machine frame and the front end portion of the engine side frame portion. is there.

According to the present invention, in the driving part support frame, a part where an engine or transmission that is heavier and bulkier than an electric motor is mounted and a part where the electric motor is mounted are divided into an engine The engine side frame portion on which the transmission is mounted is connected to the main frame across the rear end portion of the front machine frame and the rear end portion of the rear machine frame separately from the motor side frame portion on which the electric motor is mounted. .
Thereby, the span of the connection location when the engine side frame portion is connected to the main frame is made shorter than the entire length of the driving portion support frame, and the connection strength of the engine side frame portion with respect to the main frame is improved.
In addition, the motor side frame portion that supports the electric motor, which is relatively light and small compared to the engine or transmission, extends over the front end of the engine side frame portion and the front machine frame on the front side of the front side. It is detachably connected and does not require an excessive strength structure, and the motor side frame portion is configured to be relatively compact so that it can be easily disposed near the center of the traveling machine body.

  In the present invention, the motor side frame portion is positioned between the pair of left and right main frames, and is supported such that the lower edge of the electric motor is positioned below the upper edge of the main frame. It is preferable that a motor support is provided.

  According to the present invention, the electric motor can be disposed at a position as low as possible on the traveling machine body so that the lower edge thereof is located below the upper edge of the main frame. It becomes easy to dispose the electric motor in a space that tends to be narrower on the side.

  In the present invention, the driving part support frame includes a hook-like bracket part fitted into the main frame located at a rear end part of the front machine frame from a lower side at a front end part thereof, It is preferable that the bracket portion can be connected in a state where the bracket portion is fitted from the lower side of the main frame.

  According to the present invention, the hook-shaped bracket portion is used to be fitted from the lower side of the main frame so that the driving portion support frame can be easily connected to the rear end portion of the front machine frame. is there.

  In the present invention, the driving portion support frame is connected to a rear end portion of the rear machine frame via a suspension member, and the suspension member is located at the rear end portion of the rear machine frame. The lower surface of the frame and the lower surface of the mounting bracket fixed to the lateral side surface of the main frame are provided with contact surfaces that can be applied from below, and with respect to the mounting bracket in the vertical direction. It is preferable that the coupling bolt can be coupled and fixed by a coupling bolt that can be coupled and fixed.

  According to the present invention, the suspension member and the main frame can be easily connected to each other by the connecting bolt that can be fixed in the vertical direction using the mounting bracket of the main frame and the contact surface of the suspension member. It becomes easy to do.

It is a left view of a multipurpose work vehicle. It is a top view of a multipurpose work vehicle. It is a rear view of a multipurpose work vehicle. It is a left view which shows the vehicle body frame and drive part in the second half part of a multipurpose work vehicle. It is a top view which shows the vehicle body frame and drive part in the second half part of a multipurpose work vehicle. It is a front view which shows the lower part of the driver's seat seen from the front side of a driver's seat, and the space under a seat. It is a front view which shows the under-seat space seen from the front side of the driver's seat. It is a disassembled perspective view in a seat support frame and under-seat space. It is the IX-IX sectional view taken on the line in FIG. It is a perspective view which shows the assembly | attachment state of a main frame and a drive part support frame. It is a disassembled perspective view which shows a drive part support frame. It is a perspective view which shows the state which incorporated the engine and the electric motor in the drive part support frame. It is explanatory drawing which shows removal | desorption of the horizontal frame in a seat support frame. It is sectional drawing which shows the connection structure of the horizontal frame in a seat support frame. It is a perspective view which shows the connection structure in the front part of a main frame and a drive part support frame. It is a perspective view which shows the connection structure in the rear part of a main frame and a drive part support frame.

Hereinafter, an example of an embodiment according to the four-wheel drive work vehicle of the present invention will be described based on the drawings.
In the description of the present embodiment, the front-rear direction and the left-right direction are described as follows unless otherwise specified. That is, the forward traveling direction (see arrow F in FIG. 2) during traveling of a traveling machine body such as a multipurpose work vehicle to which the present invention is applied is “front”, and the backward traveling direction (see arrow B in FIG. 2). ) Is “rear”, the direction corresponding to the right side with reference to the forward-facing posture in the front-rear direction (see arrow R in FIG. 2) is “right”, and similarly the direction corresponding to the left side (see arrow L in FIG. 2). Is “left”.

〔overall structure〕
1 to 3 show a multipurpose work vehicle as an example of a four-wheel drive work vehicle.
This multi-purpose work vehicle supports a pair of left and right front wheels 4F, 4F that can be steered to the front portion of the body frame 1 that forms the framework of the traveling machine body. A pair of left and right rear wheels 4R, 4R that cannot be steered are supported at the rear of the body frame 1. The front wheels 4F and 4F and the rear wheels 4R and 4R are configured to be able to transmit a driving force from a travel output device described later. Thus, the multipurpose work vehicle is configured as a four-wheel drive type four-wheel drive vehicle.

A driving unit 2 including a steering wheel 21 and a driving seat 22 is provided at an intermediate portion in the front-rear direction of the traveling machine body.
Behind the operating unit 2 is provided a loading platform 5 that performs a dump operation with the rear end side as a swinging fulcrum x1, and between the operating unit 2 and the loading platform 5 between the operating unit 2 and the loading platform 5. A partition member 18 (which constitutes the rear wall of the operation unit 2) is disposed.
The loading platform 5 is configured to perform a dump operation by an electro-hydraulic cylinder 11 provided between the body frame 1 and a driving unit support frame 30 described later. The multi-purpose work vehicle includes left and right front fenders 12 and a bonnet 13 at the front part thereof.

The driving part 3 is provided in the rear part of the traveling machine body in a state of being located below the loading platform 5.
The driving section 3 is provided with two systems of traveling output devices, a gasoline engine 6 (hereinafter simply referred to as an engine) that is an internal combustion engine and an electric motor 8.
Of these two systems of traveling output devices, the power of the engine 6 is transmitted to the rear wheels 4R via a rear axle 14 that extends laterally from a transmission case 7 that houses a transmission (not shown). Is done. The power of the electric motor 8 is input to the front wheel differential case 16 by the front wheel drive shaft 15 extending forward from the front end portion of the electric motor 8, and is transmitted to the front wheels 4F via the left and right front axles 17.

  The driver 2 is provided with a lops frame 20 that surrounds the periphery of a driver seat 22 on which a driver is seated and a passenger seat 23 on which another passenger is seated to form a boarding space s1. As a result, the passengers who are seated in the driver's seat 22 and the boarding seat 23 are positioned in the boarding space s1 surrounded by the lops frame 20.

A lower seat space s2 corresponding to the lower side of the driver's seat 22 and the passenger seat 23 at the lower part of the boarding space s1 surrounded by the lops frame 20 is provided with fuel for the engine 6 as shown in FIGS. Is used as a space for arranging a fuel tank 34 for supplying electric power and a battery 9 for supplying electric power to the electric motor 8.
The under-seat space s2 is also used to allow the electric motor 8 attached to the driving unit support frame 30 that supports the engine 6 to be installed in a state of entering the under-seat space s2. . A specific structure related to the arrangement of the electric motor 8 attached to the driving unit support frame 30 will be described later.

[Body frame]
As shown in FIGS. 1, 4, and 8, the vehicle body frame 1 is higher than the front machine casing 1 </ b> A disposed to support the floor surface of the driving unit 2 and the floor surface of the driving unit 2. And a rear machine casing 1B disposed at a position. The rear machine casing 1B is located on the rear side of the front machine casing 1A, and the front machine casing 1A and the rear machine casing 1B are configured integrally with each other.
Specifically, the body frame 1 includes a pair of left and right main frames 10 that are long in the front-rear direction. The main frame 10 includes a front frame 10A, a rear frame 10C, and a rising leg 10B that is located between the front frame 10A and the rear frame 10C, and has a low front side and a high rear side. It is formed in steps. The left and right main frames 10 are connected and integrated by a crosspiece member 10D at a plurality of locations in the front-rear direction.

  The main frame 10 is provided in the entire range in the front-rear direction of the front machine casing 1A and the rear machine casing 1B. Of the main frame 10, the front frame 10A is a framework of the front machine casing 1A, and the rear frame 10C is a framework of the rear machine casing 1B. The rising leg portion 10B is connected so that the front frame 10A and the rear frame 10C are integrated at an intermediate position between the front machine casing 1A and the rear machine casing 1B.

As shown in FIGS. 1 and 2, the front machine casing 1A supports left and right front wheels 4F via left and right front suspensions (not shown). A driving part support frame 30 is fixed to the lower side of the rear machine casing 1B, and left and right rear wheels 4R are supported by the driving part support frame 30 via left and right rear suspensions 4A.
In addition to supporting the rear wheel 4R as described above, the driving part support frame 30 serves to form the driving part 3 on the lower side of the rear machine frame 1B. Part. In other words, the driving portion support frame 30 is configured to be connectable to the main frame 10 across the rear end portion of the front machine casing 1A and the rear end portion of the rear machine casing 1B, and is connected to the main frame 10. A part of the vehicle body frame 1 is configured in a state where the main frame 10 is attached, but the main frame 10 is configured to be detachable.

[Motor support frame]
The driving portion support frame 30 includes an engine side frame portion 40 on which the engine 6 and the transmission case 7 are mounted, and a motor side frame portion 50 on which the electric motor 8 is mounted, and is configured as follows.

As shown in FIGS. 4, 5, and 10 to 12, the engine side frame portion 40 has a front end at the rear end of the front machine casing 1 </ b> A and is opposed to the rear end of the front frame 10 </ b> A. Are configured to be connectable. The rear end portion of the engine side frame portion 40 is configured to be connectable to the rear frame 10C at the rear end portion of the rear machine casing 1B.
The motor side frame portion 50 has a rear end portion connected to the front end portion of the engine side frame portion 40, and a front end portion connected to the rear end portion of the front machine casing 1 </ b> A and the front end portion of the engine side frame portion 40. It is detachably connected to the front machine casing 1 </ b> A at a location ahead of the location.
The engine side frame portion 40 and the motor side frame portion 50 thus configured are configured to be detachable from the main frame 10 in a state of being integrally connected to each other.

The engine side frame portion 40 will be described.
As shown in FIGS. 5 and 11, the engine side frame portion 40 includes a pair of left and right front and rear direction frames 41, and the front end side, rear end side, and intermediate position thereof are integrally connected by a horizontal member 42. . The left and right front-rear direction frames 41 are made of rectangular pipe material having a rectangular cross section. The square pipe material is bent at an intermediate position in the front-rear direction so that the rear-side left-right direction interval is narrower than the front-side left-right direction interval so as to avoid interference with the rear wheel 4R. The space in the left-right direction on the front end side of the front-rear direction frame 41 is formed at the same distance in the left-right direction as the rear end portion of the front frame 10 </ b> A of the main frame 10.
A flange-like bracket portion 43 for connecting the front end portion to the rear end portion of the front frame 10 </ b> A is attached to the front end portion of the engine side frame portion 40. A suspension member 45 for connecting the rear end portion to the rear end side of the rear frame 10 </ b> C is attached to the rear end portion of the engine side frame portion 40.
The suspension member 45 is configured to be wide in the left-right direction so that the upper end side can be connected to the left and right rear frames 10 </ b> C, and the lower end side is connected to the front-rear direction frame 41 of the engine side frame portion 40 so as to be wide in the left-right direction. It is configured to be narrow and formed in a constricted shape when viewed in the front-rear direction.

As shown in FIG. 15, the front end portion of the engine side frame portion 40 is connected to the rear end portion of the front frame 10 </ b> A via a connecting hook-shaped bracket portion 43 provided at the front end portion of the engine side frame portion 40. Done.
The hook-shaped bracket portion 43 is formed in a hook shape with the upper side open, and is welded and fixed to the engine-side frame portion 40 in a state where the front end portion of the engine-side frame portion 40 is held from the lower side. A bolt insertion hole 43 b is formed in the horizontal plate portion 43 a of the flange-shaped bracket portion 43 protruding upward from the upper edge of the engine side frame portion 40.
The hook-shaped bracket portion 43 is mounted from the lower side of the front frame 10A so that the horizontal plate portion 43a embraces the rear end portion of the front frame 10A from both the left and right sides. In this state, the bolt insertion hole 10Aa formed in the rear end portion of the front frame 10A is matched with the bolt insertion hole 43b formed in the horizontal plate portion 43a, and connected to both the bolt insertion holes 10Aa and 43b from the left and right directions. The bolts 44 are inserted and tightened, and the rear end portion of the front frame 10A is sandwiched from both the left and right sides by the horizontal plate portion 43a to be connected and fixed.

The connection of the rear end portion of the engine side frame portion 40 to the rear end portion of the rear machine casing 1B is performed as follows.
As shown in FIG. 10 to FIG. 12 and FIG. 16, the rear end of the engine side frame portion 40 is suspended so that the upper end side can be connected to the rear frame 10C at the rear end of the rear machine casing 1B. The lower end portion of the member 45 is fixed by welding.
A connecting pad 46 is fixed to the upper end of the suspension member 45 by welding. The connecting contact plate 46 includes an upward contact surface 46a provided with a bolt insertion hole 46b. A mounting bracket 47 having a downward lower surface 47a is welded and fixed to a lateral side surface portion of the lateral side surface of the rear frame 10C facing toward the body side. The mounting bracket 47 is also formed with a bolt insertion hole 47b.
The bolt insertion hole 46b provided in the connection backing plate 46 and the bolt insertion hole 47b provided in the mounting bracket 47 are matched, and the connection bolt 48 is inserted into the bolt insertion holes 46b and 47b from above and below and tightened. As a result, the upper end of the suspension member 45 is detachably connected to the rear frame 10C.

The motor side frame portion 50 will be described.
As shown in FIGS. 5, 8, and 11, the motor-side frame portion 50 includes a pair of left and right front-rear frames 51 formed of a downward-opening cross-section channel member. The front-rear direction frame 51 and a pair of front and rear horizontal members 52 that connect the front end side and the rear end side thereof are provided and formed in a rectangular frame shape in plan view.
The width in the left-right direction between the front-rear direction frames 51 in the motor side frame portion 50 is formed to be narrower than the distance in the left-right direction between the front frames 10A of the main frame 10, and is positioned between the left and right front frames 10A. Arranged in a state.

A pair of left and right connecting brackets that overlap with a pair of left and right mounting seats 42 a provided on the horizontal member 42 on the front end side of the engine side frame portion 40 are mounted on the horizontal member 52 on the rear end side of the motor side frame portion 50. 52a is provided. The rear end side of the motor side frame portion 50 can be integrally connected to the engine side frame portion 40 by inserting and fastening the connection bolt 53 to the connection bracket 52a and the mounting seat portion 42a. It is.
The front end side of the motor-side frame portion 50 is configured to be detachable with respect to a connecting member 54 attached to a cross beam member 10D that is horizontally mounted between the front frames 10A of the main frame 10.
That is, a connection hole 51a is formed on the upper surface side of the front end portion of the front-rear direction frame 51 of the motor-side frame portion 50, and a retaining nut is provided on the rear surface side of the front-rear direction frame 51 in the portion where the connection hole 51a is formed. (Not shown) is fixed. Therefore, the connecting hole 51a of the front-rear frame 51 is positioned so as to coincide with a connecting hole (not shown) formed in the connecting member 54, and the connecting bolt 55 is tightened to fix the connection or the connecting bolt. 55 can be loosened and released.

The connecting portion between the connecting member 54 and the front end portion of the front-rear direction frame 51 is closer to the front-rear direction of the vehicle body frame 1 than the connecting portion between the rear end portion of the front frame 10A and the front end portion of the engine side frame portion 40. It is set at the front side location.
The motor side frame portion 50 is not located above the upper edge 10Ab of the front frame 10A, but as shown in FIG. 9, the upper edge 51b of the front-rear frame 51 is higher than the upper edge 10Ab of the front frame 10A. Also, the lower edge 51c of the front-rear direction frame 51 and the lower edge 10Ac of the front frame 10A are arranged at substantially the same height. As described above, the front-rear direction frame 51 is disposed so as to be positioned within the vertical width of the front frame 10 </ b> A, so that the electric motor 8 can be easily disposed at a low position on the vehicle body frame 1.

A plurality of fixing bases 56 (corresponding to motor support portions) for connecting and fixing the electric motor 8 are erected on the upper surface side of the front-rear direction frame 51 of the motor side frame portion 50, The connecting bolt 57 is inserted into the mounting portion provided, and the electric motor 8 is fixed to the front and rear fixing bases 56.
When attached to the motor side frame portion 50, the lower edge of the electric motor 8 is located below the upper edge 10Ab of the front frame 10A of the main frame 10 and is lower than the lower edge of the front frame 10A. It is located above (see FIG. 6).

[Seat support frame]
Next, the seat support frame 24 will be described.
As shown in FIGS. 4 and 7, the seat support frame 24 is for supporting the driver seat 22 and the passenger seat 23 below the passenger space s <b> 1 surrounded by the lops frame 20. Also, the underseat space s2 is formed below the boarding seat 23.
As shown in FIG. 6, the underseat space s <b> 2 is provided with a fuel tank 34 for supplying fuel to the engine 6, a battery 9 for supplying power to the electric motor 8, and various electric devices 37 for control. In addition to being used as a work space, it is also used as a place for securing a space for housing the electric motor 8 itself.

As shown in FIG. 8, the seat support frame 24 includes a pair of left and right front frames 25 extending forward from the upper portions of the left and right rising legs 10B of the main frame 10, and left and right front frames 10A. A pair of left and right standing frames 26 erected from the upper surface side, and a lateral frame 27 arranged in the left and right direction in a state where the intersection portions of the forward frame 25 and the standing frame 26 are connected to each other are provided.
A seat mount (not shown) is mounted on the upper side of the seat support frame 24, and the driver's seat 22 and the passenger seat 23 are fixed to the seat mount.

In the underseat space s2 formed below the seat support frame 24, as shown in FIG. 6, the tank is located on the right side of the right front frame 10A (shown on the left side in FIG. 6). A support base 34A is extended, and a fuel tank 34 is disposed above the tank support base 34A.
On the left side of the left front frame 10A (shown on the right side in FIG. 6), various electric devices 37 for control are placed on the seat support frame 24 so as to be located laterally outside the front frame 10A. It is arranged via an appropriate attachment member connected to the horizontal frame 27 and the like.

A lithium ion battery is provided as a battery 9 for supplying electric power to the electric motor 8 between the left and right front frames 10A in the under-seat space s2.
As shown in FIGS. 7 to 9, the battery 9 is formed in a shape having steps with different heights on the bottom side. A high lower surface 9a on the right side is fixed to a tall right mounting base 35R that is erected from the right front frame 10A, and a lower lower surface 9b on the left side is a short erected from the left front frame 10A. It is fixed to the left mounting base 35L.
Among the lower surfaces 9a and 9b having different heights, the left and right high-side lower surface 9a is longer in the left-right direction than the left-side lower lower surface 9b, and the right-side higher lower surface 9a. In the lower space, the electric motor 8 mounted on the motor side frame portion 50 of the driving unit support frame 30 is disposed in a state of being embedded, that is, overlapping in the front-rear direction and the left-right direction.

In this way, the battery 9 and the electric motor 8 overlap in both the front-rear direction and the left-right direction, and the upper portion of the electric motor 8 is disposed in a state of being embedded in the high lower surface 9a on the right side of the battery 9, The battery 9, the electric motor 8, and the assembly of the battery 9 and the electric motor 8 are mounted in a state of being concentrated near the center position in the front-rear direction and the left-right direction of the traveling machine body.
That is, the battery 9 and the electric motor 8 are located between the left and right front frames 10A in the left-right direction, and are located between the front axle 17 and the rear axle 14 in the front-rear direction. Further, in the front-rear direction, the battery 9 and the electric motor 8 are present in the under-seat space s2 that is closer to the center position.

Also in the vertical direction, the battery 9 and the electric motor 8 are provided at a low position on the vehicle body frame 1.
That is, the battery 9 is attached to the front frame 10A at a lower position in the body frame 1 via the right mounting base 35R and the left mounting base 35L. The motor side frame portion 50 includes a front / rear direction frame 51 having an upper edge 51b at a position lower than the upper edge 10Ab of the front frame 10A, and the electric motor 8 is mounted on the front / rear direction frame 51. Thus, by arranging the motor side frame portion 50 as low as possible on the traveling machine body, the arrangement height of the electric motor 8 on the traveling machine body is made as low as possible.
In addition to this, the electric motor 8 is disposed in a state where the battery 9 having a step on the lower surface side is buried under the high lower surface 9a, and the battery 9 and the electric motor 8 overlap in the vertical direction. It is in a state to do. Thereby, also about the aggregate | assembly of the battery 9 and the electric motor 8, the height position of the gravity center G2 can be set as low as possible on a traveling machine body.

As a result, as shown in FIG. 7, in a multi-purpose work vehicle having a sturdy lops frame 20 and having a relatively high position of the center of gravity G1 of the entire traveling machine body, the height position of the center of gravity G1 of the entire traveling machine body The height position of the center of gravity G2 of the assembly of the battery 9 and the electric motor 8 is lower. That is, the arrangement configuration of the battery 9 and the electric motor 8 described above serves as a means for lowering the height of the center of gravity G1 of the entire traveling machine body.
Here, the center of gravity G1 of the entire traveling machine body refers to the position of the center of gravity G1 of the entire traveling machine body when the battery 9 and the electric motor 8 are mounted on the body frame 1.

Of the seat support frame 24, the lateral frame 27 extending in the left-right direction is slightly between the left and right front frames 10 </ b> A and slightly more than the intersection of the left and right forward frames 25 and the standing frame 26. It is configured so that it can be divided at two locations off the side.
This is because, even when a structure in which a part of the battery 9 is disposed below the sideways frame 27 is adopted, one side of the sideways frame 27 facing the position where the battery 9 exists is adopted. This is because the battery 9 can be easily detached and hung without hindrance.

Specifically, as shown in FIGS. 7 and 8, a square pipe-shaped lateral frame 27 includes a detachable detachable frame portion 28 (corresponding to a part of the frame portion) and a non-detachable fixed frame portion 29 ( It corresponds to the other frame portion).
The fixed frame portion 29 is connected to the intersection of the forward frame 25 and the upright frame 26 near the end portion on the inward side of the body and is provided on the outer lateral side of the body with respect to the front frame 10A. 38 and the handrail frame 39 are fixed to the vehicle body frame 1 by being connected near the end on the outer side of the body.
The detachable frame portion 28 is configured so that both end portions thereof can be connected to the left and right fixed frame portions 29 and is not connected to other portions.

The attachment / detachment frame portion 28 and the fixed frame portion 29 are connected as follows.
As shown in FIGS. 13 and 14, each of the detachable frame portion 28 and the fixed frame portion 29 is formed by fitting prismatic connection fittings 28b and 29b into end portions of square pipe-shaped frame tubes 28a and 29a. It is configured by fixing together.
Of the connection fittings 28b and 29b, the connection fitting 29b on the fixed frame portion 29 side has a shape in which the upper half on the end portion side facing the detachable frame portion 28 is cut away. The connection fitting 28 b on the side of the attachment / detachment frame portion 28 has a shape in which the lower half portion on the end portion side facing the fixed frame portion 29 is cut out.
Then, the connection fitting 28b on the side of the attachment / detachment frame 28 with the lower half cut off is superimposed on the upper side of the connection fitting 29b on the fixed frame portion 29 side with the cut off upper half. The connecting metal fittings 28b and 29b are connected to each other by connecting bolts 27a extending vertically through the connecting metal fittings 28b and 29b to connect the detachable frame portion 28 to the fixed frame portion 29.

(Moving part)
The driving | running | working part 3 by which the output device for 2 driving | running | working was arrange | positioned is demonstrated.
The part existing below the seat support frame 24 and the part existing above the driving part support frame 30 correspond to the driving part 3.
Of the two systems of traveling output devices, one system of traveling output devices is an engine 6 constituted by an internal combustion engine, and the other one system of traveling output devices is an electric motor 8 for driving driving.
This multi-purpose work vehicle is configured to drive the rear wheels 4 </ b> R with the power of the engine 6 and to drive the front wheels 4 </ b> F with the driving force of the electric motor 8.
The state in which the driving of the rear wheel 4R by the engine 6 and the driving of the front wheel 4F by the electric motor 8 are performed simultaneously is the four-wheel driving state, and the driving state only by the driving of the rear wheel 4R by the engine 6 is the rear two-wheel driving. The traveling drive state in which only the front wheels 4F are driven by the electric motor 8 is the front two-wheel drive state.
The driving states of the four-wheel driving state, the rear two-wheel driving state, and the front two-wheel driving state are appropriately switched by a switching operation of an operating tool (not shown) in the driving unit 2 although a specific description is omitted. It is configured.

As shown in FIG. 2 to FIG. 4, the output shaft (not shown) of the prime mover 3 that is located above the prime mover support frame 30 has a horizontal attitude along the left-right direction of the vehicle body. The engine 6 is provided in a rear inclined posture in which the cylinder head 6A side is located on the rear side of the vehicle body with respect to the output shaft. By providing the engine 6 in the rear inclined posture in this manner, the overall height of the engine 6 can be lowered while maintaining the output shaft in a horizontal posture, and the overall height of the prime mover 3 can be lowered.
On the rear side of the engine 6, a transmission case 7 having a transmission is arranged. A belt-type continuously variable transmission 31 is disposed on the left lateral side of the engine 6 and the transmission case 7, and an exhaust pipe 32 extending rearward along the upper side of the belt-type continuously variable transmission 31. Further, an exhaust treatment device 33 such as a muffler is provided.

As shown in FIGS. 6 to 8, the fuel tank 34 for supplying fuel to the engine 6 has a seat as described above in a portion of the prime mover 3 that exists below the seat support frame 24. Various control electrical devices 37 that are provided at the right end of the lower space s2 and transmit control signals to the engine 6 and the electric motor 8 are provided at the left end of the lower seat space s2.
Further, at the left end portion of the under-seat space s2, only a part of the front side exists below the seat support frame 24, and the rear part protrudes rearward from the lower side of the seat support frame 24. In this state, a control battery 36 is provided for outputting a control signal to various control electric devices 37 or the like or for supplying electric power for operation control of the engine 6 (see FIG. 10). .

Among the parts existing below the seat support frame 24, an electric motor 8 for driving the front wheels 4 </ b> F and the electric motor 8 are provided between the left and right main frames 10 corresponding to the center side in the left-right direction. A battery 9 for supplying electric power is provided.
The battery 9 is a lithium ion battery and is configured as a plug-in type that takes in electric power from the outside.
The battery 9 is slightly lifted by the right mounting base 35R and the left mounting base 35L in the under-seat space s2, and the electric motor 8 is disposed under the battery 9 under the seat. The battery 9 is located on the front side of the engine 6 and is lifted up slightly by the right mounting base 35R and the left mounting base 35L, but is provided in a state of being located within the same height range as the engine 6.

  An output shaft (not shown) of the electric motor 8 protrudes toward the front side of the machine body. The front wheel drive shaft 15 is connected to the output shaft, and the power of the electric motor 8 is transmitted to the front wheels 4F via the front wheel differential case 16 and the front axle 17.

[Other Embodiment 1]
In the above embodiment, the engine 6 is provided with a gasoline engine, but is not limited to this structure.
For example, a diesel specification equipped with a diesel engine may be used.
Other configurations may be the same as those in the above-described embodiment.

[Second embodiment]
In the above embodiment, an example in which a plug-in type battery is used as the battery 9 is shown, but the structure is not limited to this.
For example, the battery 9 may be charged using a generator driven by the engine 6 or a regenerative device.
Other configurations may be the same as those in the above-described embodiment.

[3 of another embodiment]
In the above embodiment, the structure in which the electric motor 8 is disposed in the under-seat space s2 is illustrated, but the structure is not limited to this structure.
For example, the electric motor 8 may be disposed in the upper space of the engine side frame portion 40 and the motor side frame portion 50 may be omitted.
Other configurations may be the same as those in the above-described embodiment.

[4 of another embodiment]
In the above embodiment, the structure in which the electric motor 8 is embedded in the lower side of the battery 9 is illustrated, but the structure is not limited to this.
For example, the electric motor 8 and the battery 9 may be provided side by side.
Other configurations may be the same as those in the above-described embodiment.

[5 of another embodiment]
In the above-described embodiment, the operation unit 2 has the structure in which the lops frame 20 is provided, but the structure is not limited thereto.
For example, the driving cabin may be provided instead of the rops frame 20, or the losing frame 20 surrounding the driving unit 2 and the driving cabin may be provided.
Other configurations may be the same as those in the above-described embodiment.

  The present invention can be applied to a four-wheel drive work vehicle such as a transport vehicle, a tractor, a riding mower, a riding rice transplanter, and the like provided with two traveling output devices of an engine and an electric motor.

DESCRIPTION OF SYMBOLS 1 Body frame 1A Front machine frame 1B Rear machine frame 2 Driving part 3 Driving part 4F Front wheel 4R Rear wheel 6 Engine 8 Electric motor 9 Battery 10 Main frame 14 Rear axle 17 Front axle 22 Driving seat 30 Driving part support frame 40 Engine side Frame part 43 Gutter-shaped bracket part 47 Mounting bracket 48 Connecting bolt 50 Motor side frame part 56 Motor support part

Claims (6)

A traveling unit having a vehicle body frame supported by a pair of left and right front wheels and a pair of left and right rear wheels, a driving unit provided with a driving seat, and a driving unit that transmits driving force to the front wheels and the rear wheels; Is provided,
The prime mover includes two systems of output devices, an engine constituted by an internal combustion engine and an electric motor for driving driving,
The vehicle body frame is disposed on the rear side of the front machine frame at a position higher than the front machine frame disposed to support the floor surface of the operation unit and the floor surface of the operation unit. The rear machine casing is constructed as a single unit,
A driving part supporting frame for supporting the engine and transmission located below the rear machine frame and supporting the electric motor;
A four-wheel drive work vehicle in which the driving part support frame is detachably connected to the front machine frame and the rear machine frame. The vehicle body frame includes a pair of left and right main frames that are long in the front-rear direction within the entire range of the front machine casing and the rear machine casing.
2. The driving unit support frame according to claim 1, wherein a front side is connected to the main frame at a rear end of the front machine frame, and a rear side is connected to the main frame at a rear end of the rear machine frame. Four-wheel drive work vehicle. The driving section support frame includes an engine side frame portion on which the engine and the transmission are mounted, and a motor side frame portion on which the electric motor is mounted.
The engine side frame portion is connected to the main frame across a rear end portion of the front machine frame and a rear end portion of the rear machine frame,
The motor side frame portion has a rear end portion connected to a front end portion of the engine side frame portion, and a front end portion connected to the rear end portion of the front machine frame and the front end portion of the engine side frame portion. The four-wheel drive work vehicle according to claim 2, wherein the four-wheel drive work vehicle is detachably connected to the front machine frame at a position ahead of the vehicle.   The motor side frame portion is located between the pair of left and right main frames, and includes a motor support portion that supports the lower edge of the electric motor positioned below the upper edge of the main frame. The four-wheel drive work vehicle according to claim 3.   The driving part support frame includes a hook-shaped bracket part fitted into the main frame located at a rear end part of the front machine frame from a lower side at a front end part thereof, and the hook-shaped bracket part is attached to the main frame. The four-wheel drive work vehicle according to any one of claims 2 to 4, wherein the four-wheel drive work vehicle is configured to be connectable in a state of being fitted from a lower side of the frame.   The driving portion support frame is connected to a rear end portion of the rear machine frame via a suspension member, and the suspension member is provided on a lower surface of the main frame located at a rear end portion of the rear machine frame; A contact surface that can be applied from below to the lower surface of the mounting bracket fixed to the lateral side surface of the main frame, and a connection that can be connected and fixed to the mounting bracket in the vertical direction. The four-wheel drive work vehicle according to any one of claims 2 to 5, wherein the four-wheel drive work vehicle is configured to be connected and fixed by a bolt.

Images