JP7419225B2 - work vehicle - Google Patents

Description

The present invention relates to the structure of the entire body of a working vehicle.

In the work vehicle disclosed in Patent Document 1, crawler-type traveling devices are provided on the right and left sides of the body, and the body is supported by the right and left traveling devices. A working device is supported at the front of the machine, and an engine, which is a driving part, is supported at the rear of the machine.

Japanese Patent Application Publication No. 4-200312

In Patent Document 1, a heavy work device is supported at the front of the aircraft, and a heavy engine is supported at the rear of the aircraft, so that the weight distribution is uneven between the front and rear of the aircraft. Since it is in a biased state, there is room for improvement in terms of the overall balance of the work vehicle.

An object of the present invention is to improve the overall balance of a working vehicle in which a working device is supported at the front of the vehicle and a driving unit is supported at the rear of the vehicle.

The work vehicle of the present invention includes a truck frame arranged along the front-rear direction, a plurality of rolling wheels supported by the truck frame, a driving wheel, and a crawler belt attached to the driving wheel and the rolling wheel. Right and left running devices are provided to support the aircraft body, support the right and left drive wheels, and are disposed between the right track frame and the left track frame in plan view. The transmission case is provided with a transmission case in which the drive wheels are disposed above the front and rear intermediate portions of the truck frame in side view, and the number of the rolling wheels on the front side with respect to the drive wheels and the rear side thereof are A working device supported by the machine body is disposed so that the number of wheels is the same, and is located on the front side with respect to the mission case, and a working device is placed on the rear side with respect to the mission case. a driving part supported by the aircraft body such that the driving part is located at the same position as the rear end of the crawler belt in a side view; A driving unit is supported by the fuselage.

According to the present invention, a right and left traveling device having a truck frame, a plurality of wheels, a drive wheel, and a crawler belt is provided with a transmission case that supports the right and left drive wheels. The mission case rotatably supports the right and left drive wheels, and the drive system for the drive wheels is housed inside the mission case, so the mission case is similar to working equipment and driving parts. It is a heavy item.

According to the present invention, the mission case is disposed between the right truck frame and the left truck frame in plan view, so the mission case is disposed near the left and right center portions of the right and left traveling devices.
The drive wheel is disposed above the front-rear intermediate portion of the truck frame when viewed from the side. Thereby, the drive wheels can be arranged so that the number of wheels on the front side and the number of wheels on the rear side of the drive wheels are the same. As a result, the transmission case is disposed near the front and rear central portions of the traveling device.

According to the present invention, in a working vehicle in which a working device is supported at the front part of the machine body and a driving part is supported at the rear part of the machine body, the mission case, which is a heavy object, is placed between the right truck frame and the left truck frame. The transmission case is disposed near the center of the front and rear of the traveling device, thereby allowing the transmission case to be disposed near the center of the work vehicle.
As a result, the overall weight distribution of the work vehicle can be approximated to be uniform, and the weight distribution can be prevented from being biased towards the front and rear of the machine. Balance can be improved. By improving the overall balance of the work vehicle, the running performance of the work vehicle is improved.

According to the present invention, it is advantageous in that the overall length of the work vehicle can be reduced, and since the driving part is closer to the center of the work vehicle, the weight distribution is not biased towards the front and rear of the machine body. This is advantageous in terms of suppression.

The work vehicle of the present invention includes a truck frame arranged along the front-rear direction, a plurality of rolling wheels supported by the truck frame, a driving wheel, and a crawler belt attached to the driving wheel and the rolling wheel. Right and left running devices are provided to support the aircraft body, support the right and left drive wheels, and are disposed between the right track frame and the left track frame in plan view. The transmission case is provided with a transmission case in which the drive wheels are disposed above the front and rear intermediate portions of the truck frame in side view, and the number of the rolling wheels on the front side with respect to the drive wheels and the rear side thereof are A working device supported by the machine body is disposed so that the number of wheels is the same, and is located on the front side with respect to the mission case, and a working device is placed on the rear side with respect to the mission case. a driving unit supported by the fuselage body so as to be located at the front of the fuselage body, and a driving unit supported by the front part of the fuselage body so as to be able to swing up and down about a support axis along the left-right direction, and extended to the front side. , a support arm that supports the working device is provided, and the support axis is arranged above the crawler belt and rearwardly with respect to the front end of the crawler belt in side view. ing.

According to the present invention, a right and left traveling device having a truck frame, a plurality of wheels, a drive wheel, and a crawler belt is provided with a transmission case that supports the right and left drive wheels. The mission case rotatably supports the right and left drive wheels, and the drive system for the drive wheels is housed inside the mission case, so the mission case is similar to working equipment and driving parts. It is a heavy item.
According to the present invention, the mission case is disposed between the right truck frame and the left truck frame in plan view, so the mission case is disposed near the left and right center portions of the right and left traveling devices.
The drive wheel is disposed above the front-rear intermediate portion of the truck frame when viewed from the side. Thereby, the drive wheels can be arranged so that the number of wheels on the front side and the number of wheels on the rear side of the drive wheels are the same. As a result, the transmission case is disposed near the front and rear central portions of the traveling device.
According to the present invention, in a working vehicle in which a working device is supported at the front part of the machine body and a driving part is supported at the rear part of the machine body, the mission case, which is a heavy object, is placed between the right truck frame and the left truck frame. The transmission case is disposed near the center of the front and rear of the traveling device, thereby allowing the transmission case to be disposed near the center of the work vehicle.
As a result, the overall weight distribution of the work vehicle can be approximated to be uniform, and the weight distribution can be prevented from being biased towards the front and rear of the machine. Balance can be improved. By improving the overall balance of the work vehicle, the running performance of the work vehicle is improved.
According to the present invention, when a working device is configured to be supported by a support arm that is vertically swingably supported at the front of a machine body, the support axis of the support arm is located above the crawler belt in a side view. It is located on the rear side with respect to the front end of the crawler belt.
This allows the support arm to move closer to the center of the work vehicle, and the work equipment to move closer to the center of the work vehicle, preventing the weight distribution from being biased toward the front and rear of the machine. It is advantageous in that respect.

The work vehicle of the present invention includes a truck frame arranged along the front-rear direction, a plurality of rolling wheels supported by the truck frame, a driving wheel, and a crawler belt attached to the driving wheel and the rolling wheel. right and left traveling devices supporting the aircraft body, supporting the right and left drive wheels, and disposed between the right track frame and the left track frame in plan view. The transmission case is provided with a transmission case in which the drive wheels are disposed above the front and rear intermediate portions of the truck frame in side view, and the number of the wheels on the front side with respect to the drive wheels and the number of the wheels on the rear side are A working device supported by the machine body is arranged so that the number of wheels is the same, and is located on the front side with respect to the mission case, and a working device is placed on the rear side with respect to the mission case. a driving unit supported by the aircraft body such that the driving unit is an engine having a crankcase and a cylinder, and the output shaft of the crankcase is located on the left and right sides of the aircraft body in a plan view. The crankcase is arranged so as to be shifted to one side of the left and right with respect to the center, and the cylinder is extended upward from the crankcase toward the left and right center of the fuselage as seen in the front and rear directions, The battery is disposed diagonally and supported by the body so as to be located below the cylinder .

According to the present invention, a right and left traveling device having a truck frame, a plurality of wheels, a drive wheel, and a crawler belt is provided with a transmission case that supports the right and left drive wheels. The mission case rotatably supports the right and left drive wheels, and the drive system for the drive wheels is housed inside the mission case, so the mission case is similar to working equipment and driving parts. It is a heavy item.
According to the present invention, the mission case is disposed between the right truck frame and the left truck frame in plan view, so the mission case is disposed near the left and right center portions of the right and left traveling devices.
The drive wheel is disposed above the front-rear intermediate portion of the truck frame when viewed from the side. Thereby, the drive wheels can be arranged so that the number of wheels on the front side and the number of wheels on the rear side of the drive wheels are the same. As a result, the transmission case is disposed near the front and rear central portions of the traveling device.
According to the present invention, in a working vehicle in which a working device is supported at the front part of the machine body and a driving part is supported at the rear part of the machine body, the mission case, which is a heavy object, is placed between the right truck frame and the left truck frame. The transmission case is disposed near the center of the front and rear of the traveling device, thereby allowing the transmission case to be disposed near the center of the work vehicle.
As a result, the overall weight distribution of the work vehicle can be approximated to be uniform, and the weight distribution can be prevented from being biased towards the front and rear of the machine. Balance can be improved. By improving the overall balance of the work vehicle, the running performance of the work vehicle is improved.
According to the present invention, when the driving unit is an engine, the cylinder of the engine is arranged to be inclined, so that the height of the engine is suppressed.
According to the present invention, the battery can be arranged compactly by effectively utilizing the space below the cylinder of the engine to arrange the battery.

In the present invention, it is preferable that the battery is supported by the body in a sideways posture so that the terminals of the battery face opposite to the crankcase.

According to the present invention, since the terminals of the battery are arranged apart from the engine, it is possible to reduce the amount of contact between the harness connected to the terminals of the battery and the engine.

The work vehicle of the present invention includes a truck frame arranged along the front-rear direction, a plurality of rolling wheels supported by the truck frame, a driving wheel, and a crawler belt attached to the driving wheel and the rolling wheel. Right and left running devices are provided to support the aircraft body, support the right and left drive wheels, and are disposed between the right track frame and the left track frame in plan view. The transmission case is provided with a transmission case in which the drive wheels are disposed above the front and rear intermediate portions of the truck frame in side view, and the number of the rolling wheels on the front side with respect to the drive wheels and the rear side thereof are A working device supported by the machine body is disposed so that the number of wheels is the same, and is located on the front side with respect to the mission case, and a working device is placed on the rear side with respect to the mission case. a driving unit supported by the aircraft body such that the driving unit is an engine having a crankcase and a cylinder, and the driving unit is located between the mission case and the engine; An electric actuator supported by the aircraft body, and a wire connected across the electric actuator and an accelerator section of the engine are provided, and the accelerator section of the engine is operated by the electric actuator via the wire. .

According to the present invention, a right and left traveling device having a truck frame, a plurality of wheels, a drive wheel, and a crawler belt is provided with a transmission case that supports the right and left drive wheels. The mission case rotatably supports the right and left drive wheels, and the drive system for the drive wheels is housed inside the mission case, so the mission case is similar to working equipment and driving parts. It is a heavy item.
According to the present invention, the mission case is disposed between the right truck frame and the left truck frame in plan view, so the mission case is disposed near the left and right center portions of the right and left traveling devices.
The drive wheel is disposed above the front-rear intermediate portion of the truck frame when viewed from the side. Thereby, the drive wheels can be arranged so that the number of wheels on the front side and the number of wheels on the rear side of the drive wheels are the same. As a result, the transmission case is disposed near the front and rear center portions of the traveling device.
According to the present invention, in a working vehicle in which a working device is supported at the front part of the machine body and a driving part is supported at the rear part of the machine body, the mission case, which is a heavy object, is placed between the right truck frame and the left truck frame. The transmission case is disposed near the center of the front and back of the traveling device, thereby allowing the transmission case to be disposed near the center of the working vehicle.
As a result, the overall weight distribution of the work vehicle can be approximated to a uniform one, and the weight distribution can be prevented from being biased towards the front and rear of the machine. Balance can be improved. By improving the overall balance of the work vehicle, the running performance of the work vehicle is improved.
When the driving part is an engine, an electric actuator may be provided to operate the accelerator part of the engine.
According to the present invention, the electric actuator can be arranged compactly by effectively utilizing the space between the transmission case and the engine to arrange the electric actuator.
By connecting the wire across the electric actuator and the accelerator section of the engine, the electric actuator can easily operate the accelerator section of the engine via the wire.
In the present invention, an even number of the rolling wheels are supported by the truck frame, and the rotation center of the drive wheel is the rotation center of two of the even number of rolling wheels at the front and back center in a plan view. Preferably, it is located between the centers.
According to the present invention, as described above, when the drive wheels are arranged so that the number of wheels on the front side and the number of wheels on the rear side are the same, the center of rotation of the drive wheels is The center of rotation of the wheel does not exist directly below.
Thereby, even if the position of the drive wheel is lowered, interference between the drive wheel and the rolling wheels can be avoided, so there is no need to arrange the drive wheel at an unnecessarily high position. Since the drive wheels do not need to be placed at a high position, the transmission case can also be lowered, which is advantageous in terms of lowering the center of gravity of the work vehicle.

FIG. 3 is a right side view of the work vehicle. FIG. 3 is a left side view of the work vehicle. FIG. 3 is a plan view of the work vehicle. FIG. 3 is a rear view of the work vehicle. FIG. 3 is a vertical right side view of the work vehicle. FIG. 3 is a longitudinal sectional front view of the vicinity of the front part of the work vehicle. FIG. 3 is a plan view of the vicinity of the front part of the work vehicle. FIG. 3 is a vertical right side view of the vicinity of the mission case. FIG. 3 is a vertical left side view of the vicinity of the mission case. FIG. 3 is a cross-sectional plan view of the vicinity of the mission case. FIG. 3 is a bottom view of the vicinity of the mission case. It is a schematic diagram showing a transmission system from an engine to right and left transmissions and a mowing device.

A work vehicle is shown in FIGS. 1-12. In FIGS. 1 to 12, F indicates the front direction, B indicates the rear direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction. .

(Overall configuration of work vehicle)
As shown in FIGS. 1 to 4, a work vehicle includes a machine body 1, right and left crawler-type traveling devices 2 that support the machine body 1, and a mission case 20 arranged near the center of the machine body 1. It is provided.

In the work vehicle, there is a mowing device 3, which is a working device supported at the front of the machine body 1, located on the front side with respect to the mission case 20, and a grass cutting device 3, which is a work device supported on the front part of the machine body 1, located on the front side with respect to the mission case 20; An engine 45, which is a driving unit supported at the rear of the vehicle 1, is provided.

(Configuration of traveling device)
As shown in FIGS. 1 to 4, the right and left traveling devices 2 include a truck frame 17, four wheels 16, a drive wheel 15, and a crawler belt attached to the drive wheels 15 and wheels 16. 19 and a guide member 18.

A square pipe-shaped truck frame 17 is arranged along the front-rear direction, an even number of four wheels 16 are supported by the truck frame 17, and a guide member 18 extends over the front and rear parts of the truck frame 17. It is supported by The track frame 17 is a part of the fuselage 1 (see later-described (structure of upper horizontal frame and upper vertical frame in the fuselage)) and is a part of the traveling device 2.

A crawler belt 19 is attached to the drive wheel 15, the roller wheel 16, and the guide member 18. The crawler belt 19 is rotationally driven by the drive wheel 15, and the guide member 18 makes it difficult for the crawler belt 19 to come off from the wheel 16.

(Relationship between traveling device and transmission case)
As shown in FIGS. 8 to 11, the right and left drive wheels 15 are supported by a transmission case 20 (see (Configuration of Mission Case) to be described later).

The mission case 20 is disposed between the right track frame 17 and the left track frame 17 in plan view, and the mission case 20 is located near the left and right center A1 of the right and left traveling devices 2 (airframe 1). It is located in An input shaft 27 and an output shaft 28 of the mission case 20 (see later-described (Mission case configuration) and FIG. 12) are arranged at the left-right center A1 of the aircraft body 1 in plan view.

The right drive wheel 15 is arranged above the front-rear middle part of the right truck frame 17 when viewed from the side, and the left drive wheel 15 is arranged above the front-rear middle part of the left truck frame 17 when viewed from the side. The transmission case 20 is arranged so that the transmission case 20 is arranged in the vicinity of the front and rear center portions of the traveling device 2.

As shown in FIGS. 1 and 2, the center of rotation of the drive wheel 15 is the center of rotation of two wheels 16 at the center of the front and back of the four (even number) wheels 16 in plan view and side view. (between the center of rotation of the second wheel 16 and the center of rotation of the third wheel 16). As a result, the number (2) of the front wheels 16 (the first wheels 16 and the second wheels 16) with respect to the drive wheels 15, and the number (2) of the wheels 16 on the rear side (the third wheels 16) and the number (2) of the fourth wheel 16) are the same number.

(Configuration of the lower horizontal frame in the aircraft)
As shown in FIGS. 5, 6, 10, and 11, in plan view, the front side of the mission case 20 is located along the left-right direction, and the front part of the right truck frame 17 and the front part of the left truck frame 17 are A square pipe-shaped front lower horizontal frame 5 is connected across the frame.

As shown in FIGS. 4, 5, 10, and 11, in a plan view, the rear side of the mission case 20 extends from the rear of the right truck frame 17 to the rear of the left truck frame 17 along the left-right direction. A square pipe-shaped rear lower horizontal frame 6 is connected thereto.

As shown in FIGS. 5, 6, 7, 10, and 11, the right reinforcing member 7, whose plate material is bent into a trapezoidal shape in plan view, is on the front side with respect to the right part of the lower horizontal frame 5 of the right truck frame 17. , the right part of the lower horizontal frame 5, and the rear part of the right truck frame 17 with respect to the right part of the lower horizontal frame 5, and the right reinforcing member 7 is connected to the right part of the lower horizontal frame 5. It is connected across the track frame 17 and the right side of the lower horizontal frame 5.

The left reinforcing member 7, which is a plate material bent into a trapezoidal shape in plan view, is attached to the front part of the left truck frame 17 with respect to the left part of the lower horizontal frame 5, the left part of the lower horizontal frame 5, and the left part of the left truck frame 17. The left reinforcing member 7 is connected to the left part of the lower horizontal frame 5 in the truck frame 17 and the rear part thereof, and the left reinforcing member 7 is connected to the left part of the lower horizontal frame 5 in the truck frame 17. connected.

The right reinforcing member 7 is a right front support bracket connected to the right truck frame 17 and extending toward the left truck frame 17. The left reinforcing member 7 is a left front support bracket connected to the left truck frame 17 and extending toward the right truck frame 17.

(Configuration of support frame in aircraft)
As shown in FIGS. 10 and 11, a right rear support bracket 8 made of a bent plate is connected to the rear of the right truck frame 17 and extends toward the left truck frame 17. . A left rear support bracket 8 made of a bent plate is connected to the rear of the left truck frame 17 and extends toward the right truck frame 17.

As shown in FIGS. 5 to 11, right front and left front support frames 9 are provided. The front right support frame 9 is connected to the right reinforcement member 7 (front right support bracket) and extends upward, and the front left support frame 9 is connected to the left reinforcement member 7 (front left support bracket). and is extended upward.

Right rear and left rear support frames 10 are provided. The right rear support frame 10 is connected to the right rear support bracket 8 and extends upward, and the left rear support frame 10 is connected to the left rear support bracket 8 and extends upward. has been done.

As a result, the right front support frame 9 is connected to the front portion of the drive wheel 15 in the right truck frame 17 and the front lower horizontal frame 5 via the right reinforcing member 7 (right front support bracket). ing. A right rear support frame 10 is connected to a portion of the right truck frame 17 on the rear side of the drive wheel 15 via a right rear support bracket 8 .

The left front support frame 9 is connected to the front portion of the drive wheel 15 in the left truck frame 17 and the front lower transverse frame 5 via the left reinforcing member 7 (left front support bracket). A left rear support frame 10 is connected to a portion of the left truck frame 17 on the rear side of the drive wheel 15 via a left rear support bracket 8 .

(Configuration of the upper horizontal frame and upper vertical frame of the aircraft)
As shown in FIGS. 5 to 11, the upper part of the right front support frame 9 and the left front support frame 9 are connected so that the front upper horizontal frame 11 is located above the transmission case 20 when viewed in the front-rear direction. It is connected to the upper part.

The rear upper horizontal frame 11 is connected across the upper part of the right rear support frame 10 and the upper part of the left rear support frame 10 so as to be located above the transmission case 20 when viewed in the front-rear direction. There is.

The right upper vertical frame 12 is connected to the upper part of the front right support frame 9 and the upper part of the rear right support frame 10 so as to be located above the transmission case 20 in side view.

The left upper vertical frame 12 is connected to the upper part of the left front support frame 9 and the upper part of the left rear support frame 10 so as to be located above the transmission case 20 in side view.

As described above, the fuselage 1 includes the right and left track frames 17 (see the above-mentioned (configuration of the traveling device)), the front and rear lower horizontal frames 5 and 6 (see the above-mentioned (configuration of the lower horizontal frames in the fuselage) ), right front and left front support frames 9, right rear and left rear support frames 10 (see the above (Structure of support frames in the aircraft)), front and rear upper horizontal frames 11, right and left It has an upper vertical frame 12 and the like.

As shown in FIGS. 1 to 4, the transmission case 20 is supported by the right front and rear support frames 9, the left front and rear support frames 10, the front and rear upper horizontal frames 11, and the right and left upper vertical frames 12. is surrounded.

(Mission case configuration)
As shown in FIGS. 10, 11, and 12, the mission case 20 is provided with a center case 21, a right support case 22, and a left support case 23.

The central case 21 is provided with a central portion 24, a right transmission 25 connected to the right portion of the central portion 24, and a left transmission 26 connected to the left portion of the central portion 24. The central portion 24 and the transmission devices 25 and 26 cause the central case 21 to be arranged along the left-right direction in plan view.

In the central case 21, an input shaft 27 is supported at the left and right center portions at the rear of the central portion 24 so as to protrude rearward. An output shaft 28 and a filter 29 are supported at the left and right center portions of the front portion of the center portion 24 so as to protrude toward the front side.

The right support case 22 is connected to the right part (transmission 25) of the center case 21 and extends toward the rear (engine 45 side) (see (engine configuration) described later) in plan view. The right drive wheel 15 (see the above-mentioned configuration of the traveling device) is supported by the lateral outer portion of the right support case 22.

The left support case 23 is connected to the left part (transmission 26) of the center case 21 and extends toward the rear (engine 45 side) (see (engine configuration) described later) in plan view. The left drive wheel 15 (see the above-mentioned (Configuration of traveling device)) is supported by the laterally outer portion of the left support case 23.

(Connection status between the aircraft and the mission case)
As shown in FIGS. 8 to 11, the right connection bracket 13 is connected to a portion of the right truck frame 17 between the front and rear lower transverse frames 5 and 6, and extends toward the left truck frame 17. It's being served. The right connection bracket 14 is connected to the right connection bracket 13 and extends upward.

A left connecting bracket 13 is connected to a portion of the left truck frame 17 between the front and rear lower transverse frames 5 and 6, and extends toward the right truck frame 17.
The left connection bracket 14 is connected to the left connection bracket 13 and extends upward.

The right connection bracket 30 is connected to a portion of the right front support frame 9 between the right track frame 17 and the front upper horizontal frame 11, and extends rearward. The left connection bracket 30 is connected to a portion of the left front support frame 9 between the left track frame 17 and the front upper horizontal frame 11, and extends rearward.

In the transmission case 20, the lower part of the right support case 22 opposite the right drive wheel 15 is connected to the right connection brackets 13, 14, and the upper part of the right support case 22 is connected to the right connection bracket 13, 14. It is connected to a bracket 30.

In the transmission case 20, the lower part of the left support case 23 opposite the left drive wheel 15 is connected to the left connection brackets 13, 14, and the upper part of the left support case 23 is connected to the left connection bracket 13, 14. It is connected to a bracket 30.

In the mission case 20, the right support case 22 is connected to the right front support frame 9 via the right connection bracket 30, and is connected to the right front support frame 9 on the right truck frame 17 via the right connection brackets 13 and 14. It is connected to a portion on the rear side of the frame 9 (a portion between the right front support frame 9 and the right rear support frame 10).

As a result, the right support case 22 is connected to the right front support frame 9 and the rear part of the right track frame 17 with respect to the right front support frame 9 (the right front support frame 9 and the right rear support frame 10). (the part in between).

In the mission case 20, the left support case 23 is connected to the left front support frame 9 via the left connection bracket 30, and the left support case 23 is connected to the left front support frame 9 on the left truck frame 17 via the left connection brackets 13 and 14. It is connected to a portion on the rear side of the frame 9 (a portion between the left front support frame 9 and the left rear support frame 10).

As a result, the left support case 23 is connected to the left front support frame 9 and the rear part of the left truck frame 17 with respect to the left front support frame 9 (the left front support frame 9 and the left rear support frame 10). (the part in between).

In the mission case 20, the right support case 22 is connected to the right truck frame 17 via the right connection brackets 13 and 14, and the left support case 23 is connected to the left truck frame via the left connection brackets 13 and 14. 17, the transmission case 20 is connected across the right truck frame 17 and the left truck frame 17.

(Configuration of the transmission system inside the mission case)
As shown in FIG. 12, in the mission case 20, a transmission shaft 40 is supported along the left-right direction inside the central portion 24, and a bevel gear 27a connected to the input shaft 27 and a transmission shaft 40 are connected to the transmission shaft 40. The bevel gear 40a is in mesh with the bevel gear 40a.

A transmission shaft 41 is supported inside the central portion 24 along the front-rear direction, and a transmission gear 27b connected to the input shaft 27 and a transmission gear 41a connected to the transmission shaft 41 mesh with each other.
The transmission shaft 41 is supported concentrically with the output shaft 28, and a hydraulically operated working clutch 42 is provided between the transmission shaft 41 and the output shaft 28.

The transmissions 25 and 26 are configured as hydrostatic continuously variable transmission type, and are configured to be able to shift continuously in forward and reverse directions, and the right and left parts of the transmission shaft 40 are connected to the transmission shaft 40. It is connected to hydraulic pumps 25a and 26a of 25 and 26.

Inside the right and left support cases 22, 23, a transmission shaft 43 is connected to hydraulic motors 25b, 26b of transmissions 25, 26. A transmission shaft 43 and an axle 44 are supported along the left-right direction, and a transmission gear 43a connected to the transmission shaft 43 and a transmission gear 44a connected to the axle 44 mesh with each other. An axle 44 protrudes laterally outward from the right and left support cases 22, 23, and the drive wheel 15 is connected to the protruding portion of the axle 44.

With the above configuration, in the mission case 20, the power transmitted to the input shaft 27 is transmitted to the bevel gear of the input shaft 27, as described in (Configuration of a transmission system connected across the engine and the mission case), which will be described later. 27a and the bevel gear 40a of the transmission shaft 40, it is transmitted to the transmission shaft 40, and from the transmission shaft 40 to the right and left transmissions 25, 26.

In the right and left transmissions 25 and 26, the power that is continuously shifted to the forward and reverse sides is transferred to the right and left transmissions 25 and 26 via the transmission shafts 43 and axles 44 of the right and left support cases 22 and 23. The signal is transmitted to the drive wheels 15, and the crawler belts 19 are rotationally driven by the drive wheels 15.

As shown in FIGS. 1 to 5, right and left operating mechanisms 31 each having an electric motor 31a are provided, the right operating mechanism 31 is disposed above the right transmission 25, and the left operating mechanism 31 is located above the left transmission 26. The electric motors 31a of the right and left operating mechanisms 31 operate trunnion shafts (not shown) of the right and left transmissions 25, 26.

The right and left transmissions 25 and 26 are shifted to the forward and reverse sides by the right and left operating mechanisms 31 separately, so that when the aircraft 1 moves forward and backward, stops, and moves forward and backward, the right It is possible to make turns to the left, pivot turns to the right and left, and super pivot turns.

(Engine configuration)
As shown in FIGS. 4 and 5 and FIGS. 8 to 11, a flat engine frame 4 is connected to a rear lower horizontal frame 6 and extends rearward, and an air-cooled single-cylinder engine 45 is mounted on the engine frame 4. , supported by the engine frame 4.

As shown in FIGS. 1 to 5, the engine 45 is arranged on the rear side with respect to the transmission case 20, and is arranged between the right and left traveling devices 2 in a plan view, and the crawler belt 19 in a side view. is arranged so as to overlap the rotation path of the fourth wheel 16 and the fourth wheel 16. The engine 45 is supported by the engine frame 4 (airframe 1) so that the rear end of the engine 45 (crankcase 46) is located at approximately the same position as the rear end of the crawler belt 19 in side view.

As shown in FIGS. 5 and 12, the engine 45 is arranged such that the output shaft 48 of the engine 45 is located at a lower position than the input shaft 27 of the mission case 20 when viewed from the side, and protrudes toward the mission case 20. It is supported by a crankcase 46 of 45.

As shown in FIGS. 1 to 5 and 12, the output shaft 48 of the engine 45 (crankcase 46) is located on the right side with respect to the left-right center A1 of the aircraft 1 (input shaft 27 of the mission case 20) in plan view. A crankcase 46 of an engine 45 is supported by the engine frame 4 so as to be offset.

The cylinder 47 of the engine 45 extends upward from the crankcase 46 in the left-right direction toward the left-right center A1 of the aircraft 1 (input shaft 27 of the mission case 20) in a front view (rear view). It is arranged diagonally (as seen) and extends to the left beyond the left and right center A1 of the fuselage 1.

An air cleaner 49 for intake air of the engine 45 and a muffler 50 for exhaust air of the engine 45 are provided above the cylinder 47 of the engine 45. A fuel tank 51 of the engine 45 is provided above the crankcase 46 of the engine 45. A suction port (not shown) for sucking cooling air is provided at the rear of the engine 45 (crankcase 46), and a box-shaped dustproof cover 32 made of punched metal is attached to the suction port.

(Configuration of transmission system connected across engine and mission case)
As shown in FIGS. 5 and 12, the gear transmission section 53 is supported by the crankcase 46 of the engine 45, and extends upward from the crankcase 46 of the engine 45 in the vertical direction when viewed from the side. . The gear transmission section 53 extends from the crankcase 46 of the engine 45 in the left-right direction toward the input shaft 27 of the mission case 20 (left-right center A1 of the aircraft 1) in a front view (back view). ) and are arranged diagonally.

An input shaft 55 and an output shaft 56 are supported inside the gear transmission section 53 along the front-rear direction. An input shaft 55 of the gear transmission section 53 is connected to the output shaft 48 of the engine 45, and a transmission gear 55a connected to the input shaft 55 and a transmission gear 56a connected to the output shaft 56 mesh with each other.

The gear transmission is arranged so that the output shaft 56 is arranged at the same height as the input shaft 27 of the mission case 20 and at the same position as the input shaft 27 of the mission case 20 in plan view (left and right center A1 of the fuselage 1). The posture of the section 53 is set.

The transmission shaft 54 is connected across the output shaft 56 of the gear transmission section 53 and the input shaft 27 of the mission case 20, and is arranged along the front-rear direction at the left-right center A1 of the fuselage 1 in plan view. A channel-shaped cover 52 is attached to the gear transmission section 53 so as to cover the upper side of the transmission shaft 54.

With the above configuration, as shown in FIG. The rotation is reversed and transmitted to the output shaft 56 via the gear 56a. The power of the output shaft 56 of the gear transmission section 53 is transmitted to the input shaft 27 of the mission case 20 via the transmission shaft 54.

The power transmitted to the input shaft 27 of the mission case 20 is transmitted to the drive wheels 15 and the mowing device via the transmission system inside the mission case 20, as described above (Configuration of the transmission system inside the mission case). 3.

(Configuration near the engine)
As shown in FIGS. 2 and 4, a battery frame 33 formed by bending a plate material into an angle shape is connected to a portion of the rear lower horizontal frame 6 adjacent to the engine frame 4, and extends rearward. It's being served.

The battery 34 is supported by the battery frame 33, and the battery 34 is supported by the battery frame 33 (airframe 1) so as to be located below the cylinder 47 of the engine 45. In this case, the battery 34 is supported by the battery frame 33 (airframe 1) in a sideways posture so that the terminal 34a of the battery 34 faces opposite to the crankcase 46 of the engine 45.

As shown in FIGS. 3 and 5, an angled accelerator frame 35 is connected to the rear lower horizontal frame 6 and extends to the front, and a support bracket 35a is connected upward to the accelerator frame 35. .

An electric motor 36, which is an electric actuator, and a gear mechanism 61 driven by the electric motor 36 are supported by a support bracket 35a of the accelerator frame 35. A wire 37 is connected between the gear mechanism 61 (electric motor 36) and the accelerator section of the engine 45, and the accelerator section of the engine 45 is operated by the electric motor 36 via the gear mechanism 61 and the wire 37. .

The electric motor 36 and the gear mechanism 61 are located between the mission case 20 (center case 21) and the engine 45 in the front-rear direction, and between the right and left support cases 22 and 23 of the mission case 20 in the left-right direction. It is supported by the support bracket 5a (body 1) of the accelerator frame 35 so as to be located at .

(Composition of mowing device)
As shown in FIGS. 1, 2, and 3, the mowing device 3 includes an upper part 38 in which a ceiling part and a rear part are continuously formed, and a lateral part 39 connected to the right and left parts of the upper part 38. provided to form an outer shape. A drum 59 supporting a large number of cutting blades 58 is supported across the right and left side portions 39 so as to be rotatable around an axis along the left-right direction, and a Frell mower type mowing device 3 is configured. has been done.

A reinforcing frame 57 in the shape of a round pipe is connected across the rear ends of the right and left side parts 39 and a bracket 38a connected to the rear part of the upper part 38. It is connected to the rear of the mowing device 3 along the line. A cover 60 made of a flexible rubber plate is connected to the front end of the upper part 38 and hangs downward.

Right and left support brackets 62 are connected to the right and left parts of the front part of the upper part 38, and the front parts of the support brackets 62 are provided with fixing pins 62a. The right and left support arms 63 are supported by the support bracket 62 so as to be swingable around an axis P1 along the left-right direction, and the lock member 63a is swingable around an axis P2 along the left-right direction. Possibly supported on a support arm 63.

The right and left support rods 64 are supported by the ends of the support arm 63, and the attachment position of the support arm 63 on the support rod 64 can be changed along the longitudinal direction of the support rod 64. A caster wheel type grounding wheel 65 serving as a grounding body is supported at the end of the support rod 64 so that the direction can be changed freely.

The state shown by the solid line in FIG. 1 is a state in which the grounding ring 65 has changed its posture to the grounding position. It is brought out and touches the ground to support the mowing device 3. By hooking the locking member 63a of the support arm 63 onto the fixing pin 62a of the support bracket 62, the support arm 63 (grounding ring 65) is held at the grounding position.

In the grounding position, the grounding wheel 65 is disposed at approximately the same position as the right end and left end (39) of the mowing device 3, or at a position slightly shifted to the left and right center of the mowing device 3, as seen in the front-rear direction, It is located between the right end and left end (lateral side part 39) of the mowing device 3.

By removing the locking member 63a of the support arm 63 from the fixing pin 62a of the support bracket 62 and operating the support arm 63 upward and backward around the axis P1, as shown by the two-dot chain line in FIGS. 1 and 2, The attitude of the grounding wheel 65 can be changed to the storage position.

In the retracted position, the grounding wheel 65 is located on the rear side of the front end (cover 60) of the mowing device 3 in side view. The grounding wheel 65 is disposed in a plan view at approximately the same position as the right end and left end (39) of the mowing device 3, or at a position slightly shifted to the left and right center of the mowing device 3, and is located at the right end of the mowing device 3. and the left end portion (lateral side portion 39).
As described above, the grounding wheel 65 is supported by the upper part 38 of the mowing device 3 so that its posture can be changed between the grounding position and the storage position.

(Configuration of right and left support arms supporting the mowing device)
As shown in FIGS. 3, 5, 6, and 7, a channel-shaped support bracket 66 and a flat plate-shaped support bracket 67 are provided in the portion between the right front and left front support frames 9 of the front lower horizontal frame 5, and are arranged upwardly. connected. An output section 68 that outputs the power of the engine 45 is connected to support brackets 66 and 67 so as to be located slightly above the front lower horizontal frame 5 and below the filter 29. .

The output section 68 is provided at the front of the aircraft body 1 using support brackets 66 and 67, and is supported by the front lower horizontal frame 5, and is connected to the right front support frame 9 and the left front support frame 9 when viewed from the front. placed in between.

As shown in FIGS. 3, 5, 6, 7, and 9, a support bracket 69 is connected to the upper and lower intermediate portions of the left front support frame 9. A round pipe-shaped horizontal support frame 70 is provided, and the horizontal support frame 70 is connected to the left side of the output part 68 and connected to a support bracket 69, and is connected to the left front side of the output part 68 via the support bracket 69. It is connected to a support frame 9. The lateral support frame 70 extends above the left crawler belt 19 to the left lateral outside.

The left support arm 72 is supported by the lateral outer portion of the lateral support frame 70 so as to be able to swing up and down about a support axis P3 that passes through the center of the lateral support frame 70 and extends in the left-right direction.
The left support arm 72 is disposed slightly laterally outward with respect to the left traveling device 2 (crawler belt 19) in plan view and extends forward. The front end portion of the left support arm 72 is connected to the left end portion (left side portion 39) of the mowing device 3.

As shown in FIGS. 3, 5, 6, 7, and 8, the support bracket 73 is connected to the upper and lower intermediate portions of the right front support frame 9. The right support arm 71 is supported by the support bracket 73 concentrically with the left support arm 72 so as to be swingable up and down about the support axis P3, and extends to the front side. The front end of the right support arm 71 is connected to the bracket 38a of the upper part 38 of the mowing device 3.

(Arrangement status of mowing device and right and left support arms)
As shown in the above-mentioned (configuration of the right and left support arms supporting the mowing device) and FIGS. It is arranged on the upper side with respect to the front end portion of the crawler belt 19 of the traveling device 2, and arranged on the rear side with respect to the front end portion of the crawler belt 19 of the traveling device 2, and arranged in the front side with respect to the drive wheels 15 of the traveling device 2.

The right support arm 71 is supported by the right front support frame 9 so as to be able to swing up and down around the support axis P3, and is supported by the front part of the body 1 and extends forward. The right support arm 71 is arranged between the right and left traveling devices 2 (crawler belts 19) in plan view, and the right traveling device 2 is located on the opposite side of the left support arm 72 in plan view. (crawler belt 19) and the output section 68.

The right support arm 71 is attached to the reinforcing frame 57 via the bracket 38a of the upper part 38 of the mowing device 3, and the right support arm 71 is attached to the right and left traveling devices 2 (crawler belts) of the mowing device 3. 19) supports the opposing part (bracket 38a of the upper part 38 of the mowing device 3). With the above configuration, the mowing device 3 is supported by the right support arm 71.

The left support arm 72 is supported by the horizontal support frame 70 so as to be able to swing up and down around a transmission shaft 77 (see (configuration of transmission system inside the output section) described later) (support axis P3). There is. The left support arm 72 is supported by the left front support frame 9 via the lateral support frame 70, supported by the front part of the fuselage 1 and extended to the front side, and in plan view, is supported by the left front support frame 9. It is arranged slightly laterally outward with respect to the crawler belt 19).

A left support arm 72 is attached to the reinforcing frame 57 via the left lateral side 39 of the mowing device 3 and supports the left end of the mowing device 3. With the above configuration, the mowing device 3 is supported by the left support arm 72.

As shown in FIGS. 1, 3, 6, and 7, a single-acting type lifting cylinder 74 is provided, the lower part of the lifting cylinder 74 is connected to a support bracket 66, and the lifting cylinder 74 is laterally supported in plan view. It is arranged between the right support arm 71 on the opposite side of the frame 70 and the output section 68 .

The upper part of the lifting cylinder 74 is connected to the bracket 57a of the reinforcing frame 57 of the mowing device 3 and is attached to the reinforcing frame 57, and the lifting cylinder 74 is connected across the front lower horizontal frame 5 and the mowing device 3. has been done.
As the lifting cylinder 74 expands and contracts, the right and left support arms 71 and 72 are vertically swung around the support axis P3, and the mowing device 3 is lifted and lowered.

In the state where the mowing device 3 is supported by the right and left support arms 71 and 72 as described above, as shown in FIGS. 3 and 4, the right end portion (lateral side portion 39) and the right The right end portion of the traveling device 2 (crawler belt 19) is arranged at substantially the same position as viewed in the front-rear direction. Alternatively, the right end portion (lateral side portion 39) of the mowing device 3 is arranged slightly laterally to the right of the right end portion of the right traveling device 2 (crawler belt 19) when viewed in the front-rear direction.

The left end portion (lateral side portion 39) of the mowing device 3 and the left end portion of the left traveling device 2 (crawler belt 19) are arranged at substantially the same position when viewed in the front-rear direction. Alternatively, the left end portion (lateral side portion 39) of the mowing device 3 is arranged slightly laterally to the left of the left end portion of the left traveling device 2 (crawler belt 19) when viewed in the front-rear direction.

(Configuration of transmission system inside output section)
As shown in FIGS. 5, 6, 7, and 12, in the output section 68, a cylindrical input shaft 75 is supported along the front-rear direction at the rear of the output section 68. The output shaft 28 of the mission case 20 is inserted into the input shaft 75, and the input shaft 75 and the output shaft 28 are connected by a spline structure.

A relay shaft 76, which is a transmission section, is supported inside the output section 68 along the left-right direction, and a bevel gear 75a of the input shaft 75 and a bevel gear 76a of the relay shaft 76 mesh with each other. The transmission shaft 77 is arranged along the left-right direction at a higher position than the input shaft 75 and the relay shaft 76, and the transmission gear 76b of the relay shaft 76 and the transmission gear 77a of the transmission shaft 77 mesh with each other. A transmission shaft 77 extends from the output portion 68 through the inside of the horizontal support frame 70 toward the left support arm 72, and is supported by the horizontal support frame 70 concentrically with the support axis P3. .

As shown in the above-mentioned (structure of the transmission system inside the mission case) and FIG. The signal is transmitted to the input shaft 75 of the output section 68 via the output shaft 28 .

As shown in FIGS. 5, 6, 7, and 12, in the output section 68, the power of the input shaft 75 is transmitted to the bevel gear 75a of the input shaft 75, the bevel gear 76a of the relay shaft 76, the relay shaft 76, and the transmission gear 76b of the relay shaft 76. and is transmitted to the transmission shaft 77 via the transmission gear 77a of the transmission shaft 77.

(Configuration of transmission mechanism that transmits power from the output section to the mowing device)
As shown in FIGS. 2, 6, 7, and 12, a belt-type transmission mechanism 78 is supported on the left support arm 72.

The transmission mechanism 78 includes a driving pulley 79 which is a driving rotating body attached to the left end of the transmission shaft 77, a driven pulley 80 which is a driven rotating body attached to the driving shaft 59a of the drum 59 of the mowing device 3, and a driving pulley 80 which is a driven rotating body attached to the driving shaft 59a of the drum 59 of the mowing device 3. It has a transmission belt 81 which is an endless rotating body attached to a pulley 79 and a driven pulley 80.

Further, the transmission mechanism 78 includes a tension pulley 82, which is a tension rotary body that can be operated to tension the transmission belt 81, a support member 83 and a spring 84, which will be described later. It has a cover 85 that covers the belt 81 and the like.

An arm-shaped support member 83 is supported to be swingable up and down on the left end of the horizontal support frame 70, and the support member 83 is supported to be swingable up and down around the transmission shaft 77 (support axis P3). has been done.

Tension pulley 82 is rotatably supported by support member 83 and is disposed below transmission belt 81 . A spring 84 is provided to urge the support member 83 upward, and the tension pulley 82 is pressed against the transmission belt 81, so that the transmission belt 81 is operated in a tensioned state.

As described above (Configuration of transmission system inside output section), the power transmitted to the transmission shaft 77 is transmitted through the drive pulley 79, the transmission belt 81, and the driven pulley 80 to the transmission mechanism 78 for mowing grass. This is transmitted to the device 3 (the drive shaft 59a of the drum 59), and in the mowing device 3, the drum 59 and the cutting blade 58 are rotationally driven in the counterclockwise direction in FIG.

With the above configuration, the transmission mechanism 78 is supported by the left support arm 72 and connected across the transmission shaft 77 and the mowing device 3, and the drive pulley 79 is connected to the left end of the transmission shaft 77. By being attached to the transmission mechanism 78, the transmission shaft 77 is connected to the transmission mechanism 78. By attaching the driven pulley 80 to the drive shaft 59a of the drum 59 of the mowing device 3, the driven pulley 80 is provided in the mowing device 3.

In the transmission mechanism 78 , a drive pulley 79 , a driven pulley 80 , a transmission belt 81 , a tension pulley 82 , and a cover 85 are arranged on the left lateral outer side with respect to the left support arm 72 in plan view. is supported on the left lateral outside with respect to the left support arm 72.

(Remote control of work vehicle)
Elevation control for supplying and discharging working oil to a control device (not shown), a receiver (not shown), and an elevating cylinder 74 (see the above-mentioned (arrangement state of mowing device and right and left support arms)) A work control valve (not shown) for supplying and discharging work oil to and from the work clutch 42 (see the above-mentioned (configuration of the transmission system inside the mission case)) is provided in the fuselage 1. It is being

An operation signal from a transmitter (not shown) operated by the worker is transmitted to the receiver, and the control device operates the lift control valve and the work control valve, and the lift cylinder 74 lifts and lowers the mowing device 3 and performs the work. The mowing device 3 is operated and stopped by the clutch 42.

The operation signal of the transmitter operated by the worker is transmitted to the receiver, and the electric motor 31a of the right and left operation mechanisms 31 (see the above (configuration of transmission system inside the mission case)) is activated by the control device. Then, the transmissions 25 and 26 are operated to change gears.

The right transmission 25 and the left transmission 26 are shifted to the forward and reverse sides separately, so that the aircraft 1 can move forward and backward, stop, turn to the right and left during forward and reverse movement, right Then, a pivot turn and a super pivot turn to the left are performed.

(First alternative embodiment of the invention)
The structures related to the right and left support arms 71, 72 may be configured in a left-right reverse manner as described below.

A lateral support frame 70 (transmission shaft 77) extends outward from the output section 68 to the right side, is supported by the right front support frame 9, and is positioned on the right side with respect to the right traveling device 2 (crawler belt 19). Extends laterally to the outside.

The right support arm 71 is supported by the horizontal support frame 70 so as to be able to swing up and down around the support axis P3, and is supported by the right front support frame 9 via the horizontal support frame 70, so that the right support arm 71 supports the front part of the fuselage 1. It is supported by and extends to the front side, and is arranged on the lateral outer side with respect to the right traveling device 2 (crawler belt 19) in plan view. A right support arm 71 is attached to the reinforcing frame 57 via the right side portion 39 of the mowing device 3 and supports the right end portion of the mowing device 3 .

The left support arm 72 is supported by the left front support frame 9 so as to be able to swing up and down around the support axis P3, and is supported by the front part of the fuselage 1 and extends forward. The left support arm 72 is arranged between the right and left traveling devices 2 (crawler belt 19) in plan view, and is arranged between the left traveling device 2 (crawler belt 19) on the opposite side of the right support arm 71 in plan view. It is arranged between the belt 19) and the output section 68.
The left support arm 72 is attached to the reinforcing frame 57 and supports the portion of the mowing device 3 that faces between the right and left traveling devices 2 (crawler belts 19).

The lifting cylinder 74 is arranged between the left support arm 72, which is the opposite side of the lateral support frame 70, and the output section 68 in plan view.
The transmission mechanism 78 is disposed on the right lateral outside of the right support arm 71 in plan view, and the transmission mechanism 78 is supported on the right lateral outside of the right support arm 71.

(Second alternative embodiment of the invention)
In the left support arm 72, the structure related to the horizontal support frame 70 shown in FIGS. The configuration regarding the lateral support frame 70 may be adopted.
In this configuration, the transmission shaft 77 may be supported by the right or left lateral support frame 70, and the transmission mechanism 78 may be supported by the right or left support arms 71, 72.

(Third alternative embodiment of the invention)
Both the right and left support arms 71, 72 may be configured so that the configuration related to the lateral support frame 70 is not adopted.
According to this configuration, the right support arm 71 is supported by the right front support frame 9 via the support bracket 73, and the left support arm 72 is supported by the support bracket (not shown) similar to the support bracket 73. It is supported by the left front support frame 9.

(Fourth alternative embodiment of the invention)
An even number of six or more wheels 16 may be provided, or an odd number of five or more wheels 16 may be provided.
When an odd number of wheels 16 are provided, one wheel 16 is placed directly below the drive wheel 15, and the number of wheels 16 on the front side of the wheel 16 directly below the drive wheel 15 and the drive wheel 16 are It is preferable that the number of wheels 16 on the rear side is the same as the number of wheels 16 directly below the wheel 15.

(Fifth alternative embodiment of the invention)
The engine 45 is arranged such that the output shaft 48 of the engine 45 (crankcase 46) is shifted to the left with respect to the left-right center A1 (input shaft 27 of the mission case 20) of the aircraft 1 in plan view. The crankcase 46 may be supported by the engine frame 4.

According to this configuration, the cylinder 47 of the engine 45 extends upward from the crankcase 46 in the left-right direction toward the left-right center A1 of the aircraft 1 (the input shaft 27 of the mission case 20) in a plan view. , are arranged obliquely when viewed from the front (back view), and extend to the right beyond the left-right center A1 of the fuselage 1.

(Sixth alternative embodiment of the invention)
Instead of the engine 45, an electric motor (not shown) may be provided as the driving unit.

The present invention can also be applied to a work vehicle equipped with another work device such as a snow removal device (not shown) or a rotary tiller (not shown) in place of the mowing device 3, and can be used for remotely controlled work. It can be applied not only to cars but also to work vehicles operated by workers.

1 Aircraft 2 Traveling device 3 Mowing device (work device)
15 Drive wheel 16 Rolling wheel 17 Truck frame 19 Crawler belt 20 Mission case 34 Battery 34a Battery terminal 36 Electric motor (electric actuator)
37 Wire 45 Engine (driving part)
46 Crankcase 47 Cylinder 48 Output shaft 71 Support arm 72 Support arm A1 Left and right center P3 Support shaft center

Claims (6)

The aircraft includes a track frame arranged along the front-rear direction, a plurality of rolling wheels supported by the track frame, a driving wheel, and a crawler belt attached to the driving wheel and the rolling wheel. equipped with supporting right and left running gear;
A transmission case is provided that supports the right and left drive wheels and is disposed between the right truck frame and the left truck frame in plan view,
The driving wheel is arranged above a front-rear intermediate portion of the truck frame in side view, and the number of the rolling wheels on the front side and the number of the rolling wheels on the rear side with respect to the driving wheel are equal to each other. , are arranged so that they have the same number,
a working device supported by the aircraft body so as to be located on the front side with respect to the mission case;
a driving unit supported by the aircraft body so as to be located on the rear side with respect to the mission case,
The working vehicle wherein the driving portion is supported by the body so that the rear end portion of the driving portion is located at substantially the same position as the rear end portion of the crawler belt when viewed from the side. The aircraft includes a track frame arranged along the front-rear direction, a plurality of rolling wheels supported by the track frame, a driving wheel, and a crawler belt attached to the driving wheel and the rolling wheel. equipped with supporting right and left running gear;
A transmission case is provided that supports the right and left drive wheels and is disposed between the right truck frame and the left truck frame in plan view,
The driving wheel is arranged above a front-rear intermediate portion of the truck frame in side view, and the number of the rolling wheels on the front side and the number of the rolling wheels on the rear side with respect to the driving wheel are equal to each other. , are arranged so that they have the same number,
a working device supported by the aircraft body so as to be located on the front side with respect to the mission case;
a driving unit supported by the aircraft body so as to be located on the rear side with respect to the mission case,
A support arm is provided that is supported by the front part of the machine body and extends to the front side so as to be able to swing up and down around a support axis along the left-right direction, and supports the working device,
The work vehicle, wherein the support shaft center is disposed above the crawler belt and rearwardly relative to the front end of the crawler belt in side view. The aircraft includes a track frame arranged along the front-rear direction, a plurality of rolling wheels supported by the track frame, a driving wheel, and a crawler belt attached to the driving wheel and the rolling wheel. equipped with supporting right and left running gear;
A transmission case is provided that supports the right and left drive wheels and is disposed between the right truck frame and the left truck frame in plan view,
The driving wheel is arranged above a front-rear intermediate portion of the truck frame in side view, and the number of the rolling wheels on the front side and the number of the rolling wheels on the rear side with respect to the driving wheel are equal to each other. , are arranged so that they have the same number,
a working device supported by the aircraft body so as to be located on the front side with respect to the mission case;
a driving unit supported by the aircraft body so as to be located on the rear side with respect to the mission case,
The driving unit is an engine having a crankcase and a cylinder,
The crankcase is arranged such that the output shaft of the crankcase is shifted to one side of the left and right sides with respect to the left and right center of the body in plan view,
The cylinder is arranged diagonally so as to extend upward from the crankcase toward the left-right center of the aircraft body when viewed in the front-rear direction,
A work vehicle, wherein a battery is supported by the body so as to be located below the cylinder. 4. The work vehicle according to claim 3 , wherein the battery is supported by the body in a sideways posture so that terminals of the battery face opposite to the crankcase. The aircraft includes a track frame arranged along the front-rear direction, a plurality of rolling wheels supported by the track frame, a driving wheel, and a crawler belt attached to the driving wheel and the rolling wheel. equipped with supporting right and left running gear;
A transmission case is provided that supports the right and left drive wheels and is disposed between the right truck frame and the left truck frame in plan view,
The driving wheel is arranged above a front-rear intermediate portion of the truck frame in side view, and the number of the rolling wheels on the front side and the number of the rolling wheels on the rear side with respect to the driving wheel are equal to each other. , are arranged so that they have the same number,
a working device supported by the aircraft body so as to be located on the front side with respect to the mission case;
a driving unit supported by the aircraft body so as to be located on the rear side with respect to the mission case,
The driving unit is an engine having a crankcase and a cylinder,
an electric actuator supported by the aircraft body so as to be located between the mission case and the engine;
A wire connected across the electric actuator and an accelerator section of the engine is provided,
A work vehicle in which an accelerator section of the engine is operated by the electric actuator via the wire. an even number of the wheels are supported by the truck frame;
Any one of claims 1 to 5, wherein the rotational center of the driving wheel is arranged between the rotational centers of two of the even number of rolling wheels located at the front and rear center of the even number of rolling wheels when viewed in plan. The work vehicle described in paragraph 1 .

Images