WO2021132328A1 - Work vehicle - Google Patents

Abstract

This work vehicle is provided with a transmission case 20 that: supports the drive wheel of a right travel device and the drive wheel of a left travel device; and is supported so that the drive wheels are positioned on the upper side in relation to a longitudinal intermediate part of a track frame 4 in side view. An engine 45 is provided that is positioned on the front side or the rear side in relation to the transmission case 20 and is positioned between the right and left travel devices in plan view. Also provided are: an input shaft 27 that is supported by the transmission case 20 so as to project toward the engine 45; an output shaft that is supported by the engine 45 so as to be disposed in a position lower than the input shaft 27 in side view and to project toward the transmission case 20; and a transmission mechanism 52 connected spanning the output shaft and the input shaft 27.

Description

Work platform

The present invention relates to a work vehicle.

[1] Conventionally, there is something related to the overall configuration of the work platform.

In the work vehicle disclosed in Patent Document 1, crawler-type traveling devices are provided on the right and left portions of the body, and the body is supported by the right and left traveling devices.
In Patent Document 1, a hydraulic motor for driving a traveling device is provided, hydraulic oil of a hydraulic pump driven by an engine is supplied to the hydraulic motor, and the traveling device is driven by the hydraulic motor.

[2] Conventionally, there is something related to the overall configuration of the work platform.

In the work vehicle disclosed in Patent Document 1, crawler-type traveling devices are provided on the right and left portions of the body, and the body is supported by the right and left traveling devices.
In Patent Document 1, a hydraulic motor for driving a traveling device is provided, hydraulic oil of a hydraulic pump driven by an engine is supplied to the hydraulic motor, and the traveling device is driven by the hydraulic motor.

[3] Conventionally, there is a variable speed configuration for running a work vehicle.

In the work vehicle disclosed in Patent Document 1, a crawler type traveling device is provided, and right and left hydraulic motors for driving the right and left traveling devices are provided. The hydraulic oil of the right and left hydraulic pumps driven by the engine is supplied to the right and left hydraulic motors, and the right and left hydraulic motors drive the right and left traveling devices independently of each other.
By driving the right and left traveling devices independently of each other, it is possible to make a credible turn or a super credible turn.

Japanese Unexamined Patent Publication No. 4-197104

[1] Issues corresponding to the background technology [1] are as follows.
Instead of the configuration in which the hydraulic pump driven by the engine and the hydraulic motor driving the traveling device are separately arranged as in the work vehicle disclosed in Patent Document 1, the power of the engine is transmitted to the transmission shaft or transmission. A configuration has been proposed in which the traveling device is transmitted to the traveling device via a transmission system such as a gear to drive the traveling device.

According to the present invention, in a work vehicle provided with a crawler type traveling device, when the power of the engine is transmitted to the traveling device via a transmission system such as a transmission shaft or a transmission gear, the weight balance of the work vehicle is adjusted. The purpose is to make it good.

[2] Issues corresponding to the background technology [2] are as follows.
Instead of the configuration in which the hydraulic pump driven by the engine and the hydraulic motor driving the traveling device are separately arranged as in the work vehicle disclosed in Patent Document 1, the power of the engine is transmitted to the transmission shaft or transmission. A configuration has been proposed in which the traveling device is transmitted to the traveling device via a transmission system such as a gear to drive the traveling device.

INDUSTRIAL APPLICABILITY In a work vehicle provided with a crawler type traveling device, the present invention improves the rigidity of the entire body when the engine power is transmitted to the traveling device via a transmission system such as a transmission shaft or a transmission gear. The purpose is to make it.

[3] Issues corresponding to the background technology [3] are as follows.
Instead of the configuration in which the hydraulic pump driven by the engine and the hydraulic motor driving the traveling device are separately arranged as in the work vehicle disclosed in Patent Document 1, the power of the traveling device on the right is transmitted. Provide a possible right transmission and a left transmission capable of transmitting the power of the left traveling device, and provide right and left operating devices capable of operating the right and left transmissions by actuators. Has been proposed.

The present invention provides right and left operating devices in which the right and left transmissions can be operated by actuators in a work vehicle equipped with right and left transmissions capable of transmitting power to the right and left traveling devices. In this case, the purpose is to configure the right and left operating devices to be compactly arranged.

[1] The solutions corresponding to the problem [1] are as follows.
The work vehicle of the present invention includes a drive wheel, a plurality of wheels, a truck frame in which the wheels are supported and arranged along the front-rear direction, and a drive wheel and a crawler belt attached to the wheels. The right and left traveling devices are provided, supporting the driving wheels of the right traveling device and the driving wheels of the left traveling device, and the driving wheels are viewed from the side with respect to the front-rear intermediate portion of the truck frame. A transmission case supported so as to be arranged on the upper side, an engine arranged on the front side or the rear side with respect to the mission case, and arranged between the right and left traveling devices in a plan view, and an engine. An input shaft supported by the mission case so as to project toward the engine, and a position lower than the input shaft in a side view, and supported by the engine so as to project toward the mission case. The output shaft is provided with a transmission mechanism connected to the output shaft and the input shaft, and the power of the engine is transmitted from the output shaft to the input shaft via the transmission mechanism. The drive wheels are rotationally driven by being transmitted to the drive wheels via a transmission system inside the mission case.

According to the present invention, in a right and left traveling device having a drive wheel, a plurality of wheels, a track frame and a crawler belt in which the wheels are supported and arranged along the front-rear direction, the right and left drive wheels are missions. Supported by the case, the power of the engine is transmitted to the input shaft of the mission case and transmitted to the drive wheels via the transmission system inside the mission case, the drive wheels are rotationally driven, and the traveling device is driven. To.

According to the present invention, since the drive wheels are arranged on the upper side with respect to the front-rear intermediate portion of the truck frame in the side view, the transmission case is also arranged at the position of the front-rear intermediate portion of the truck frame in the side view. The weight balance before and after is good.
In this case, the crawler belt extends diagonally forward and downward from the drive wheels toward the front portion of the track frame, and extends diagonally backward and downward from the drive wheels toward the rear portion of the track frame. , The contact length between the drive wheel and the crawler belt is secured.

According to the present invention, the output shaft of the engine is arranged at a position lower than the input shaft of the transmission case with respect to the transmission case in which the drive wheels are arranged on the upper side with respect to the front-rear intermediate portion of the truck frame in a side view. In addition, since the engine is supported at a low position, the position of the center of gravity of the work vehicle is lowered, and the weight balance of the work vehicle is good.
In this case, the transmission mechanism is connected across the output shaft of the engine and the input shaft of the mission case, and even if the output shaft of the engine is arranged at a position lower than the input shaft of the mission case, the power of the engine Is transmitted from the output shaft of the engine to the input shaft of the mission case via the transmission mechanism without difficulty.

In the present invention, it is preferable that the engine is arranged so as to overlap the rotation path of the crawler belt in a side view.

According to the present invention, in addition to the engine being supported in a low position so as to overlap the crawler belt rotation path in the side view, the engine is transmitted to a position where the engine deviates from the crawler belt rotation path in the side view. It is not supported at a position away from the case on the front side or the rear side.
This is advantageous in both lowering the position of the center of gravity of the work vehicle and improving the weight balance between the front and rear of the work vehicle.

In the present invention, the transmission case is connected to the right portion of the central case portion by supporting the input shaft and the central case portion arranged along the left-right direction and the right drive wheel. A right case portion extending toward the engine side and a left case portion extending toward the engine side, which supports the left drive wheel and is connected to the left portion of the central case portion, are provided. It is preferable that the engine is used.

According to the present invention, the transmission case includes a central case portion that supports the input shaft and is arranged along the left-right direction, and a right case portion that supports the right drive wheel and is connected to the right portion of the central case portion. , A left case portion that supports the left drive wheel and is connected to the left portion of the central case portion is provided.

In the above configuration, according to the present invention, the right case portion and the left case portion of the mission case are the central case portion of the mission case while the mission case and the engine are supported so as to be lined up in the front-rear direction. It extends from the right and left parts toward the engine side. In other words, the central case portion of the mission case is supported a short distance along the front-rear direction from the engine.

As a result, even if the engine is placed at the front or rear position of the truck frame in the side view, the center case portion of the mission case is located in the front / rear middle part of the truck frame in the side view. However, by being supported at a slight distance from the engine along the front-rear direction, the weight balance between the front and rear of the work vehicle is improved.

In the present invention, the transmission mechanism includes a gear transmission portion that is supported by the crankcase of the engine, is connected to the output shaft, and extends upward from the crankcase in the vertical direction in a side view, and front and rear. It is preferable that the gear transmission portion and the transmission shaft connected to the input shaft are provided so as to be arranged along the direction.

According to the present invention, the power of the engine is transmitted upward from the output shaft of the engine by the gear transmission portion of the transmission mechanism, and the power is transmitted from the gear transmission portion of the transmission mechanism to the transmission shaft at a relatively high position of the input shaft of the transmission case. It is transmitted to the input shaft of the mission case via.
As a result, the transmission shaft of the transmission mechanism is arranged at a relatively high position, so that soil and mud on the ground are less likely to adhere to the transmission shaft of the transmission mechanism.

In the present invention, the crankcase is arranged so that the output shaft is displaced to the left and right from the input shaft in a plan view, and the gear transmission portion is left and right from the crankcase in a plan view. It is preferable that they are arranged diagonally in a front view so as to extend toward the input shaft along the direction.

As described above, when the transmission mechanism is configured such that the power of the engine is transmitted upward from the output shaft of the engine by the gear transmission portion of the transmission mechanism, the transmission gear is arranged in the gear transmission portion of the transmission mechanism. It is necessary to secure the length for this.

According to the present invention, since the gear transmission portion of the transmission mechanism is arranged diagonally toward the input shaft of the transmission case in front view, the gear transmission portion of the transmission mechanism is vertically viewed toward the input shaft of the mission case in front view. The frontal distance between the output shaft of the engine and the input shaft of the mission case is longer than that of the configuration arranged in. This makes it easy to secure a length for arranging the transmission gear in the gear transmission portion of the transmission mechanism.

In the present invention, it is preferable that the cylinder of the engine is arranged obliquely in the front view so as to extend from the crankcase in the plan view toward the input shaft in the left-right direction.

As described above, in order to arrange the gear transmission part of the transmission mechanism diagonally toward the input shaft of the mission case in front view, the output shaft of the engine shifts from the input shaft of the mission case to the left or right side in plan view. When the crankcase of the engine is arranged so as to be arranged, according to the present invention, the cylinder of the engine extends from the crankcase of the engine in a plan view toward the input shaft of the mission case in the left-right direction. It is arranged diagonally in front view so that it can be put out.
As a result, the height of the engine can be suppressed, which is advantageous in lowering the position of the center of gravity of the work vehicle, and the imbalance between the left and right weights of the work vehicle can be suppressed.

In the present invention, it is preferable that the air cleaner for intake of the engine and the muffler for exhaust of the engine are arranged above the cylinder.

As described above, in a state where the cylinders of the engine are arranged diagonally in front view and the height of the engine is suppressed, according to the present invention, the space above the cylinders of the engine is effectively utilized to obtain the air cleaner and the air cleaner. A muffler can be placed.

In the present invention, it is preferable that the fuel tank for the engine is arranged above the crankcase.

As described above, in a state where the cylinders of the engine are arranged diagonally in front view, according to the present invention, the fuel tank can be arranged by effectively utilizing the space above the crankcase of the engine.

[2] The solutions corresponding to the problem [2] are as follows.
The work vehicle of the present invention includes a drive wheel, a plurality of wheels, a truck frame in which the wheels are supported and arranged along the front-rear direction, and a drive wheel and a crawler belt attached to the wheels. The right and left traveling devices are provided, and the engine and the driving wheels of the right traveling device and the mission case supporting the driving wheels of the left traveling device are provided, and the power of the engine is the power of the engine. It is transmitted to the input shaft of the mission case, transmitted to the drive wheels via the transmission system inside the mission case, the drive wheels are rotationally driven, and the transmission shaft supports the input shaft in the left-right direction. The central case portion arranged along the above, the right case portion connected to the right portion of the central case portion by supporting the drive wheels of the right traveling device, and the driving wheels of the left traveling device are supported. A left case portion connected to the left portion of the central case portion is provided, the right case portion is connected to the track frame of the right traveling device, and the left case portion is the track frame of the left traveling device. The mission case is connected over the right and left track frames.

According to the present invention, in a right and left traveling device having a drive wheel, a plurality of wheels, a track frame and a crawler belt in which the wheels are supported and arranged along the front-rear direction, the right and left drive wheels are missions. Supported by the case, the power of the engine is transmitted to the input shaft of the mission case and transmitted to the drive wheels via the transmission system inside the mission case, the drive wheels are rotationally driven, and the traveling device is driven. To.

According to the present invention, the mission case is connected over the right and left track frames, and the mission case functions as a frame arranged along the left-right direction, so that the rigidity of the entire airframe can be improved. Can be done.

According to the present invention, the mission case includes a central case portion that supports the input shaft and is arranged along the left-right direction, and a right case portion that supports the right drive wheel and is connected to the right portion of the central case portion. , The left case part that supports the left drive wheel and is connected to the left part of the center case part is provided, the right case part of the mission case is connected to the right track frame, and the left case part of the mission case Is connected to the left track frame.
As a result, the right and left drive wheels are arranged at positions close to the right and left track frames in a plan view, and the crawler belt is reasonably attached to the drive wheels and wheels.

In the present invention, the right transmission system capable of shifting the power transmitted to the input shaft forward and backward and transmitting it to the right drive wheel is provided in the transmission system of the mission case and transmitted to the input shaft. It is preferable that the transmission system of the mission case is provided with a left transmission device capable of shifting the power forward and backward and transmitting the power to the left drive wheel.

According to the present invention, by operating the right and left transmissions on the forward side and the reverse side, forward and reverse, forward and reverse turn to the right and left, right and left turn and super-reliance. You can turn the ground.

In the present invention, the right drive wheel is arranged above the front-rear intermediate portion of the right track frame in a side view, and the left drive wheel is a front-rear intermediate portion of the left track frame in a side view. It is preferable that it is arranged on the upper side with respect to the above.

According to the present invention, since the drive wheels are arranged on the upper side with respect to the front-rear intermediate portion of the truck frame in the side view, the transmission case is also arranged at the position of the front-rear intermediate portion of the truck frame in the side view. The weight balance before and after is good.
In this case, the crawler belt extends diagonally forward and downward from the drive wheels toward the front portion of the track frame, and extends diagonally backward and downward from the drive wheels toward the rear portion of the track frame. , The contact length between the drive wheel and the crawler belt is secured.

In the present invention, the right case portion is arranged so as to overlap the right track frame in a plan view, and the left case portion is arranged so as to overlap the left track frame in a plan view. Suitable.

According to the present invention, as described above, when the drive wheels are arranged above the front-rear middle portion of the truck frame in a side view, the right case portion and the left case portion of the mission case are right and left in a plan view. Since the crawler belt is arranged so as to overlap the track frame of the above, the width between the right traveling device and the left traveling device can be suppressed while the crawler belt is reasonably attached to the drive wheels and the rolling wheels.

In the present invention, the right drive wheel is supported by a laterally outer portion of the right case portion, and a portion of the right case portion opposite to the right drive wheel and the right track frame are formed. Connected via a right bracket, the left drive wheel is supported by a laterally outer portion of the left case portion to the opposite portion of the left drive wheel of the left case portion and the left It is preferable that the track frame is connected via the left bracket.

According to the present invention, in the mission case, the right drive wheel is supported by the lateral outer portion of the right case portion of the mission case, and the left drive wheel is supported by the lateral outer portion of the left case portion of the mission case. ..

In the above-mentioned state, when the right case portion and the left case portion of the mission case and the right and left track frames are connected, according to the present invention, the portion opposite to the right drive wheel in the right case portion of the mission case. , The right track frame is connected via the right bracket, and the part opposite the left drive wheel in the left case part of the mission case and the left track frame are connected via the left bracket. ing.
As a result, the right case portion and the left case portion of the mission case and the right and left track frames can be reasonably connected by the bracket while avoiding interference between the drive wheels and the bracket.

In the present invention, the right and left support frames are connected to the front or rear portion of the right and left track frames with respect to the mission case, and extend upward to support the work device. The frame is rocked up and down around the axis along the left-right direction, and an elevating cylinder capable of swinging the work frame up and down is connected to the support frame and the work frame. It is preferable that the right support frame and the mission case are connected, and the left support frame and the mission case are connected.

According to the present invention, when the work device is supported so as to be able to move up and down, the right and left support frames are connected to the front side or the rear side part of the track frame with respect to the mission case, and extend upward to support the work device. An elevating cylinder is connected across the work frame and the support frame that can support the above.

In the above configuration, according to the present invention, the right support frame and the mission case are connected, the left support frame and the mission case are connected, and the mission case is connected over the support frame and the track frame. The support frame is reinforced by the mission case.

[3] The solutions corresponding to the problem [3] are as follows.
The work vehicle of the present invention includes a right and left traveling device, a right and left transmission devices that can transmit power to the right and left traveling devices and are arranged so as to be arranged in the left-right direction, and the right and left traveling devices. Right and left operating devices capable of operating the transmission are provided, and the operating device intersects the substrate portion, the operating shaft rotatably supported by the substrate portion, and the substrate portion to the substrate portion. An actuator that is supported by one portion of the substrate portion and is capable of rotating the operation shaft is provided so as to extend in the direction, and the substrate portion, the operation shaft, and the actuator of the right operating device are provided. In the substrate portion, the operation shaft, and the actuator of the left operating device, one portion of the right substrate portion and one portion of the left substrate portion are in a direction orthogonal to the left-right direction. The right and left substrate portions are supported so as to be arranged in the left-right direction while facing the right and left transmissions in a state of being arranged on opposite sides of each other, and the right actuator is provided with the right substrate portion. The left actuator is extended from one portion toward the left substrate portion, and the left actuator is extended from one portion of the left substrate portion toward the right substrate portion, and the right operating shaft is extended. Is connected to the transmission of the right transmission, and the left operating shaft is connected to the transmission of the left transmission.

According to the present invention, the operating device is supported by a substrate portion, an operating shaft rotatably supported by the substrate portion, and one portion of the substrate portion so as to extend from the substrate portion in a direction intersecting the substrate portion. Therefore, an actuator capable of rotating the operation shaft is provided, and the actuator supported by one portion of the substrate portion is in a state of protruding from the substrate portion.

When the right and left operating devices are provided in a state where the right and left transmissions are arranged side by side in the left-right direction, the board portions of the right and left operating devices face the right and left transmissions. However, it is supported so that it is lined up in the left-right direction.
In this case, one part (actuator) of the board part of the right operating device and one part (actuator) of the board part of the left operating device are in a direction orthogonal to the left-right direction (for example, the front-back direction or the up-down direction). Etc.), and they are placed on opposite sides of each other.

As described above, when the board parts of the right and left operating devices are supported, the actuator of the right operating device is directed from one part of the board part of the right operating device toward the board part of the left operating device. Will be postponed. Similarly, the actuator of the left operating device extends from one portion of the board portion of the left operating device toward the substrate portion of the right operating device.

In this case, since one part (actuator) of the board portion of the right operating device and one part (actuator) of the board portion of the left operating device are arranged on opposite sides of each other, the right operating device The actuator of the left operating device and the actuator of the operating device on the left do not interfere with each other.
In the left-right range over the right and left transmissions, the actuator of the right operating device does not go out from the above range to the right lateral outside, and the actuator of the left operating device goes out from the above range to the left lateral outside. Never appear in.

As described above, with the substrate and actuator of the right and left operating devices supported, the operating axis of the right operating device is connected to the shifting section of the right transmission, and the operating axis of the left operating device is It is connected to the transmission section of the left transmission.
As a result, in the right and left operating devices, the operating shaft is operated by the actuator, the transmission unit of the transmission is operated, the transmission is operated to shift the speed, and the power transmitted to the traveling device is changed.

As described above, according to the present invention, when the right and left operating devices are provided for the right and left transmissions arranged so as to be arranged in the left-right direction, the actuator of the right operating device and the left operating device are provided. The right and left operating devices are compactly arranged so as not to go out laterally from the range in the left-right direction over the right and left transmissions while avoiding interference with the actuators of the above.

According to the present invention, for example, when the right and left operating devices are the same, one part (actuator) of the board part of the right operating device and one part (actuator) of the board part of the left operating device. By arranging the two sets of operating devices on opposite sides, one of the two sets of operating devices can be used as the right operating device, and the other can be used as the left operating device. It is advantageous in terms of structural simplification.

In the present invention, the right operating device is supported above the right transmission, the left operating device is supported above the left transmission, and in plan view, one of the right substrate portions. It is preferable that the portion and one portion of the left substrate portion are arranged on opposite sides of each other in the front-rear direction.

According to the present invention, the right and left operating devices are supported upward with respect to the right and left transmissions arranged so as to be arranged in the left-right direction, so that the right and left operating devices can be easily installed. Become.

In the present invention, the transmission is provided upward from the transmission, the operation shaft is provided downward from the substrate, and the relay shaft is connected to the transmission and the operation shaft to perform the operation. It is preferable that the rotation of the shaft is transmitted to the transmission unit via the relay shaft to operate the transmission unit.

According to the present invention, in a state where the operating device is supported above the transmission, even if the operating device and the transmission are slightly separated in the vertical direction, the operating shaft of the operating device and the transmission of the transmission are relayed. By being connected via the shaft, the transmission shaft of the operation device can operate the transmission portion of the transmission without difficulty.

In the present invention, it is preferable that the substrate portion is diagonally supported so that there is a difference in height between one portion and the other portion of the substrate portion in a side view.

According to the present invention, even if the substrate portion of the operating device is long, the substrate portion of the operating device is diagonally supported in the side view, so that the length of the substrate portion of the operating device in the plan view in the front-rear direction is long. Is suppressed, which is advantageous in terms of compactly arranging the right and left operating devices.

In the present invention, the actuator connected to the operation shaft extends from the operation shaft toward one portion and the other portion of the substrate portion and is supported by one portion of the substrate portion. The angle sensor that detects the rotation angle of the operation shaft by operating one part of the operation arm, rotating the operation shaft, and detecting the position of the other part of the operation arm. It is preferable that it is supported by the other portion of the substrate portion.

When the operating device is configured to rotate the operating shaft by an actuator, an angle sensor for detecting the rotation angle of the operating shaft may be provided.
According to the present invention, in the operating device, the operating arm is connected to the operating shaft, and the operating arm extends from the operating shaft toward one portion and the other portion of the substrate portion. An actuator supported on one portion of the substrate acts on one portion of the operating arm, and an angle sensor supported on the other portion of the substrate acts on the other portion of the operating arm.
As a result, the actuator and the angle sensor are supported on the substrate portion on opposite sides of the operation shaft, and the actuator and the angle sensor are arranged without interfering with each other.

In the present invention, the length of the operation shaft of the substrate portion and the end portion of one portion of the substrate portion extends to the operation shaft of the substrate portion and the end portion of the other portion of the substrate portion. It is preferable that the length is set to be longer than the length.

When comparing the actuator and the angle sensor, the actuator may be larger than the angle sensor, and may require more space to support the actuator than the angle sensor.

In the above-mentioned state, according to the present invention, the length of the actuator-side portion of the substrate portion becomes long, so that the actuator can be reasonably supported by the substrate portion.
Since the length of the portion on the angle sensor side of the substrate portion is shortened, it is advantageous in terms of compactly arranging the right and left operating devices.

In the present invention, it is preferable that the actuator is an electric motor and the coupler of the electric motor to which the harness is connected is supported on the operation shaft side with respect to the electric motor.

According to the present invention, when the actuator is an electric motor in the operating device, the coupler of the electric motor is supported on the operation shaft side with respect to the electric motor, so that the coupler of the electric motor is orthogonal to the left-right direction ( For example, in the front-rear direction, the up-down direction, etc.), the right and left operating devices are compactly arranged because they do not come out from the substrate portion.

It is a right side view of the work platform. It is a top view of a work platform. It is a perspective view which shows the state of the airframe and a mission case. It is a right side view which shows the state of the airframe and a mission case. It is a top view which shows the state of the airframe and a mission case. It is a right side view which shows the state of an airframe, an engine and a mission case. It is a vertical right side view which shows the state of the airframe, an engine and a mission case. It is a top view which shows the state of the airframe, an engine and a mission case. It is a cross-sectional plan view which shows the state of the airframe, an engine and a mission case. It is a vertical sectional front view in the vicinity of an engine and a transmission mechanism. It is the schematic which shows the transmission system of an engine and a mission case. It is a top view of the operation device. It is a vertical sectional side view of the operation device. It is a perspective view of the vicinity of a mission case, right and left operating devices.

The work vehicle is shown in FIGS. 1 to 14. In FIGS. 1 to 14, F indicates a forward direction, B indicates a backward direction, U indicates an upward direction, D indicates a downward direction, R indicates a right direction, and L indicates a left direction. ..

(Overall configuration of work platform)
As shown in FIGS. 1 and 2, the work vehicle includes the machine body 1, right and left crawler-type traveling devices 2 that support the machine body 1, and a mowing device that is a work device supported by the front portion of the machine body 1. 3 and are provided.

(Airframe configuration)
As shown in FIGS. 3, 4 and 5, the right and left track frames 4 arranged along the front-rear direction and the three horizontal frames 5, 6 connected over the right and left track frames 4. The track frame 4 and the horizontal frames 5, 6 and 7 are formed in a ladder frame shape.

The right and left support frames 8 are connected to the front portion of the right and left track frames 4 and extend upward, and two horizontal frames 9 extend over the upper part of the right and left support frames 8. , 10 are connected. The flat plate-shaped front wall portion 38 having the opening 38a opened is connected to the right and left support frames 8 and the horizontal frames 5, 9 and 10.

The flat plate-shaped engine frame 11 is connected to the horizontal frame 7 and extends to the rear side, and the rear frame 12 formed by bending the round pipe into a channel shape in a rear view is connected to the engine frame 11. ing.

An upper frame 13 formed by bending a round pipe into a channel shape in a plan view is provided, and the right and left front portions of the upper frame 13 are connected to the right and left support frames 8 of the upper frame 13. The rear portion is connected to the upper part of the rear frame 12. The upper frame 14 formed by bending the round pipe into a channel shape in the rear view is connected to the upper frame 13.

With the above configuration, the aircraft 1 includes a truck frame 4, horizontal frames 5, 6, 7, support frames 8, horizontal frames 9, 10, front wall 38, engine frame 11, rear frame 12, upper frames 13, 14, and the like. Is provided. As shown in FIGS. 1 and 2, a synthetic resin cover 37 that covers the upper side of the machine body 1 is attached to the upper frame 13.

(Configuration of mowing device)
As shown in FIGS. 1 and 2, the mowing device 3 is configured in a Frellmore type in which a drum 75 on which a large number of cutting blades 74 are supported is rotationally driven around an axis along the left-right direction.

As shown in FIGS. 1, 2 and 3, the right and left brackets 32 are connected to the lower right and left portions of the front wall portion 38, and the vertically long right and left brackets 39 are connected to the front wall portion. It is connected to the right and left parts of 38. The right and left work frames 33 are supported by the brackets 32 and the lower parts of the brackets 39 so as to be swingable up and down around the axis P1 along the left-right direction, and extend toward the front side.

Right and left elevating cylinders 35 capable of swinging the work frame 33 up and down are connected to the upper part of the bracket 39 and the work frame 33, and the elevating cylinder 35 is connected to the support frame 8 via the bracket 39. It is connected.

The mowing device 3 is supported by the front part of the work frame 33. The output shaft 28 and the filter 29 of the mission case 20 described later (configuration of the mission case) face the opening 38a of the front wall portion 38, and extend over the output shaft 28 of the mission case 20 and the mowing device 3. The transmission shaft 34 is connected.

As shown in FIGS. 6 and 7, the output shaft 28 of the mission case 20 and the transmission shaft 34 are connected via a universal joint 36 such as a universal joint, and the universal joint 36 is the same as the shaft core P1 in side view. It is placed in a position.

(Structure of traveling device)
As shown in FIGS. 1 and 2, the traveling device 2 includes a driving wheel 15, a plurality of rolling wheels 16, a guide wheel 17, a track frame 4, a guide member 18 (see FIG. 6), and a crawler belt 19. And are provided.

A plurality of rolling wheels 16 and a guide member 18 are supported by the track frame 4, a guide wheel 17 is supported by the rear portion of the track frame 4, and the track frame 4 is arranged along the front-rear direction. The truck frame 4 is a part of the airframe 1 (see (the configuration of the airframe) described above), and is a part of the traveling device 2.

The right and left drive wheels 15 are supported by the mission case 20 described later (configuration of the mission case). The right drive wheel 15 is arranged above the front-rear middle portion of the right track frame 4 in the side view, and the left drive wheel 15 is above the front-rear middle portion of the left track frame 4 in the side view. It is located in.

The crawler belt 19 is attached to the drive wheel 15, the rolling wheel 16, the guide wheel 17, and the guide member 18. The crawler belt 19 is rotationally driven by the drive wheels 15, and the guide member 18 makes it difficult for the crawler belt 19 to come off the rolling wheels 16.

(Composition of mission case)
As shown in FIGS. 1 and 2, the mission case 20 is connected to the right and left track frames 4 and supported by the body 1. As shown in FIGS. 5 to 9, the mission case 20 is provided with a central case portion 21, a right case portion 22, and a left case portion 23.

In the central case portion 21, a central portion 24 arranged along the vertical direction, a right transmission 25 connected to the right portion of the central portion 24, and a left transmission connected to the left portion of the central portion 24. 26 and are provided. The central case portion 21 is formed in a T shape in the front view (rear view) by the central portion 24 and the transmissions 25 and 26, and is arranged along the left-right direction in the plan view.

In the central case portion 21, the input shaft 27 is supported on the upper portion of the rear portion of the central portion 24 so as to project toward the rear side, and the output shaft 28 and the filter 29 are on the front side in the front portion of the central portion 24. It is supported so that it protrudes toward it.

The right case portion 22 is connected to the right portion (transmission device 25) of the central case portion 21 and extends toward the rear side (engine 45 side) (see (engine configuration) described later) in a plan view. The right drive wheel 15 (see FIGS. 1 and 2) is supported by a laterally outer portion of the right case portion 22.

The left case portion 23 is connected to the left portion (transmission device 26) of the central case portion 21 and extends toward the rear side (engine 45 side) (see (engine configuration) described later) in a plan view. The left drive wheel 15 (see FIGS. 1 and 2) is supported by a laterally outer portion of the left case portion 23.

(Composition of transmission system inside the mission case)
As shown in FIG. 11, in the mission case 20, the transmission shaft 40 is supported in the central portion 24 along the left-right direction, and is connected to the bevel gear 27a connected to the input shaft 27 and the transmission shaft 40. The bevel gear 40a is in occlusal.

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 are in mesh with each other.
The transmission shaft 41 is supported concentrically with the output shaft 28, and a hydraulically operated work clutch 42 is provided between the transmission shaft 41 and the output shaft 28.

The transmissions 25 and 26 are configured to be a hydrostatic, stepless speed change type, and are configured to be capable of steplessly shifting to the forward side and the reverse side, and the right and left parts of the transmission shaft 40 are the transmissions. It is connected to the hydraulic pumps 25b and 26b of 25 and 26.

Inside the right case portion 22 and the left case portion 23, the transmission shaft 43 and the axle 44 are supported along the left-right direction, and the transmission gear 43a connected to the transmission shaft 43 and the transmission gear connected to the axle 44. 44a is in occlusal. The transmission shaft 43 is connected to the hydraulic motors 25c and 26c of the transmissions 25 and 26, the axle 44 protrudes laterally outward from the right case portion 22 and the left case portion 23, and the drive wheel 15 protrudes laterally from the protruding portion of the axle 44. It is connected.

With the above configuration, in the mission case 20, as described later (configuration of the transmission mechanism connected to the engine and the mission case), the power transmitted to the input shaft 27 is the bevel gear of the input shaft 27. It is transmitted to the transmission shaft 40 via the bevel gear 40a of the transmission shaft 40 and the transmission shaft 40, and is transmitted from the transmission shaft 40 to the transmissions 25 and 26.

In the transmissions 25 and 26, the power that is steplessly changed to the forward side and the reverse side is transmitted to the right and left drive wheels 15 via the transmission shaft 43 and the axle 44 of the right case portion 22 and the left case portion 23. The crawler belt 19 is rotationally driven by the drive wheels 15.

By separately shifting the right transmission 25 and the left transmission 26 to the forward side and the reverse side, the aircraft 1 can turn right and left in forward and reverse, stop, forward and reverse, and right. And you can make a turn to the left and a super turn.

With the above configuration, in the transmission case 20, the right transmission 25 capable of shifting the power transmitted to the input shaft 27 forward and backward and transmitting the power to the right drive wheel 15 is provided in the transmission system of the mission case. It is in a state. The left transmission 26 capable of shifting the power transmitted to the input shaft 27 forward and backward and transmitting the power to the left drive wheel 15 is provided in the transmission system of the transmission case 20.

The power transmitted to the input shaft 27 is transmitted to the transmission shaft 41 via the transmission gear 27b of the input shaft 27 and the transmission gear 41a of the transmission shaft 41, and is transmitted from the transmission shaft 41 to the output shaft 28 via the work clutch 42. Be transmitted. The power of the output shaft 28 is transmitted to the mowing device 3 via the transmission shaft 34, and the mowing device 3 is driven.

(Connected state between the aircraft and the mission case)
As shown in FIGS. 3, 4, 5, and 14, the right bracket 30 is connected to the connecting portion between the right track frame 4 and the right portion of the horizontal frame 6 and extends upward. The left bracket 30 is connected to the connecting portion between the left track frame 4 and the left portion of the horizontal frame 6 and extends upward.
The right bracket 31 is connected to the right support frame 8 and extends backward. The left bracket 31 is connected to the left support frame 8 and extends backward.

As shown in FIGS. 5 to 9 and 14, in the mission case 20, the portion of the right case portion 22 opposite to the right drive wheel 15 is connected to the right bracket 30, and the right case portion 22. The opposite portion of the right drive wheel 15 and the right track frame 4 are connected via the right bracket 30.

In the mission case 20, the front right portion of the transmission 25 is connected to the right bracket 31, and the mission case 20 and the right support frame 8 are connected via the right bracket 31.

In the mission case 20, the portion of the left case portion 23 opposite to the left drive wheel 15 is connected to the left bracket 30, and the portion of the left case portion 23 opposite to the left drive wheel 15 and the left portion. The track frame 4 is connected to the track frame 4 via the left bracket 30.

In the mission case 20, the left front portion of the transmission 26 is connected to the left bracket 31, and the mission case 20 and the left support frame 8 are connected via the left bracket 31.

With the above configuration, as shown in FIGS. 5, 8 and 9, in the mission case 20, the right case portion 22 is arranged so as to overlap the right track frame 4 in a plan view, and the left case portion 23 is a flat surface. It is in a state of being arranged so as to overlap with the track frame 4 on the left visually.

As shown in FIG. 1, the mission case 20 supports the drive wheels 15 of the right traveling device 2 and the driving wheels 15 of the left traveling device 2, and the drive wheels 15 are viewed from the side and are in the front and rear intermediate portions of the truck frame 4. It is supported so as to be arranged on the upper side with respect to.

As shown in FIGS. 5, 8 and 9, the mission case 20 is connected over the right and left track frames 4, and the input shaft 27 and the output shaft 28 of the mission case 20 are left and right of the airframe 1 in a plan view. It is located in the center A1.

As shown in FIGS. 3 and 5 to 9, the right and left support frames 8 are connected to the front portion of the right and left track frames 4 with respect to the mission case 20 and extend upward. It is in a state. The output shaft 28 and the filter 29 of the mission case 20 are in a state of facing the opening 38a of the front wall portion 38.

(Engine configuration)
As shown in FIGS. 1 and 2, an engine 45 configured as an air-cooled single-cylinder engine is supported by an engine frame 11.

The engine 45 is arranged on the rear side with respect to the mission case 20 and is arranged between the right and left traveling devices 2 in a plan view, and overlaps with the rotation path and the guide wheel 17 of the crawler belt 19 in a side view. It is arranged like this.

As shown in FIGS. 7, 9 and 10, the input shaft 27 of the mission case 20 is supported by the mission case 20 (the central portion 24 of the central case portion 21) so as to project toward the engine 45.

The output shaft 48 of the engine 45 is arranged at a position lower than the input shaft 27 of the mission case 20 in a side view, and is supported by the crankcase 46 of the engine 45 so as to project toward the mission case 20. ..

The crankcase 46 of the engine 45 is placed on the engine frame 11 so that the output shaft 48 of the engine 45 is displaced to the right from the input shaft 27 (left and right center A1 of the airframe 1) of the mission case 20 in a plan view. It is supported.

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

As shown in FIGS. 8 and 10, an air cleaner 49 for intake of the engine 45 and a muffler 50 for exhaust of the engine 45 are arranged above the cylinder 47 of the engine 45. The fuel tank 51 for the engine 45 is arranged above the crankcase 46 of the engine 45.

(Structure of transmission mechanism connected over the engine and mission case)
As shown in FIG. 11, the transmission mechanism 52 is connected to the output shaft 48 of the engine 45 and the input shaft 27 of the transmission case 20, and the transmission mechanism 52 is connected to the gear transmission portion 53 and the transmission shaft 54. It is provided.

As shown in FIGS. 6 to 10, in the transmission mechanism 52, the gear transmission portion 53 is supported by the crankcase 46 of the engine 45, and is seen from the side view upward from the crankcase 46 of the engine 45 in the vertical direction. It has been postponed. In this case, the gear transmission unit 53 is viewed from the front so as to extend from the crankcase 46 of the engine 45 toward the input shaft 27 of the transmission case 20 (left and right center A1 of the machine body 1) in the left-right direction in a plan view. It is arranged diagonally (rear view).

As shown in FIGS. 7, 9, 10 and 11, the input shaft 55 and the output shaft 56 are supported along the front-rear direction inside the gear transmission unit 53. The input shaft 55 of the gear transmission unit 53 is connected to the output shaft 48 of the engine 45, and the transmission gear 55a connected to the input shaft 55 and the transmission gear 56a connected to the output shaft 56 are in mesh with each other.

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

The transmission shaft 54 is connected to the output shaft 56 of the gear transmission unit 53 and the input shaft 27 of the transmission case 20, and the left and right center A1 of the machine body 1 is arranged along the front-rear direction in a plan view. As shown in FIGS. 6 and 8, the battery 57 is supported by the lateral frame 6 so as to be located below the transmission shaft 54.

With the above configuration, as shown in FIG. 11, the power of the engine 45 is transmitted from the output shaft 48 of the engine 45 to the input shaft 55 of the gear transmission unit 53 (transmission mechanism 52), and the transmission gear 55a of the input shaft 55 and the transmission gear 55a It is reversed via the transmission gear 56a of the output shaft 56 and transmitted to the output shaft 56. The power of the output shaft 56 of the gear transmission unit 53 (transmission mechanism 52) is transmitted to the input shaft 27 of the transmission case 20 via the transmission shaft 54 of the gear transmission unit 53 (transmission mechanism 52).

The power transmitted to the input shaft 27 of the mission case 20 is the drive wheel 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). It is transmitted to 3.

(Configuration of operating device that can operate the transmission)
As shown in FIGS. 1 and 6, an operating device 58 capable of operating the transmissions 25 and 26 is provided. As described below, the operating device 58 is provided with a substrate portion 59, an operating shaft 61, an operating arm 62, a worm gear mechanism 64, an electric motor 65, an angle sensor 67, and the like.

As shown in FIGS. 12 and 13, the flat plate-shaped plate material is bent into a rectangular shape in a plan view to form the substrate portion 59. A connecting hole 59a is opened in one portion of the substrate portion 59, and a connecting hole 59b is opened in the other portion of the substrate portion 59. The boss portion 60 is connected to the substrate portion 59, and the operation shaft 61 is supported by the boss portion 60 (board portion 59) so as to be rotatable around the shaft core P2.

The operation arm 62 is connected to the operation shaft 61. The operation arm 62 extends from the operation shaft 61 to one portion of the substrate portion 59, and a fan-shaped gear 62a is formed in the extending portion of the operation arm 62, and the contact plate 62b is connected to the operation arm 62. .. The operation arm 62 extends from the operation shaft 61 to the other portion of the substrate portion 59, and an elongated hole 62c is opened in the extending portion of the operation arm 62.

The operation shaft 61 and the operation arm 62 are integrally supported by the substrate portion 59 (boss portion 60) so as to be rotatable around the shaft core P2. The two stopper portions 63 are connected to the substrate portion 59, and the contact plate 62b abuts on the operation arm 62 to stop the operation shaft 61 and the operation arm 62.

A worm gear mechanism 64, which is an actuator, is provided, the leg portion 64b of the worm gear mechanism 64 is connected to one portion of the substrate portion 59, and the pinion gear 64a of the worm gear mechanism 64 meshes with the fan-shaped gear 62a of the operation arm 62. There is.

The worm gear mechanism 64 extends from the substrate portion 59 in the direction intersecting the substrate portion 59, and the flange portion 65a of the electric motor 65, which is an actuator, is connected to the flange portion 64c of the worm gear mechanism 64. As a result, the worm gear mechanism 64 and the electric motor 65 are supported by one portion of the substrate portion 59 so as to extend from the substrate portion 59 in the direction intersecting the substrate portion 59.

A part of the flange portion 65a of the electric motor 65 extends toward the operation shaft 61 side. A coupler 65b of the electric motor 65 to which a harness (not shown) on the machine body 1 side is connected is provided on an extending portion of the flange portion 65a of the electric motor 65, and the coupler 65b of the electric motor 65 is attached to the electric motor 65. On the other hand, it is supported on the operation shaft 61 side.

A bracket 66 formed by bending a plate material into a channel shape is connected to the other portion of the substrate portion 59 so as to straddle the operation arm 62, and a potentiometer type angle sensor 67 is attached to the bracket 66 (the other portion of the substrate portion 59). It is supported by the part). The detection arm 67a of the angle sensor 67 is arranged between the substrate portion 59 and the bracket 66 and extends to the opposite side of the operation shaft 61, and the pin 67b at the end of the detection arm 67a of the angle sensor 67 , Is inserted into the elongated hole 62c of the operation arm 62.

In the substrate portion 59, the length L1 extending over the operation shaft 61 of the substrate portion 59 and the end portion of one portion of the substrate portion 59 is the end portion of the operation shaft 61 of the substrate portion 59 and the other portion of the substrate portion 59. It is set to be longer than the length L2 over.

With the above configuration, the pinion gear 64a of the worm gear mechanism 64 is rotationally driven in the forward and reverse directions by the electric motor 65, and one part of the operation arm 62 is operated via the fan-shaped gear 62a of the operation arm 62 to operate the operation shaft. 61 (operation arm 62) is rotated around the axis P2 in the forward and reverse directions.

When the operation shaft 61 (operation arm 62) is rotated, the detection arm 67a of the angle sensor 67 swings due to the pin 67b of the angle sensor 67 and the elongated hole 62c of the operation arm 62, and the other of the operation arm 62. The position of the portion is detected by the angle sensor 67, and the angle sensor 67 detects the rotation angle of the operation shaft 61 (operation arm 62).

(Structure of support for operating device)
As shown in FIGS. 5, 8 and 9, the right and left transmissions 25 and 26 capable of transmitting power to the right and left traveling devices 2 serve as a part of the central case portion 21 of the mission case 20 in the left-right direction. It is arranged so that it is lined up in.

As shown in FIG. 14, in the mission case 20, the right and left brackets 68 are connected to the central portion 24 of the central case portion 21, and the right bracket 69 and the left bracket 70 are formed by bending the plate material. Are connected to the right and left brackets 68.
The right bracket 71 and the left bracket 72, which are formed by bending the plate material, are connected to the right portion and the left portion of the horizontal frame 9.

(Arrangement of operating devices)
As shown in FIGS. 12, 13 and 14, two sets of the same operating devices 58 are prepared, and as described below, one of the two sets of operating devices 58 is used as the right operating device 58, and two sets are used. The other of the operating devices 58 is used as the left operating device 58.

In the right operating device 58, one part of the board portion 59 (the part on the worm gear mechanism 64 and the electric motor 65 side) is connected to the right bracket 69 via the connecting hole 59a of the board portion 59. The other portion of the substrate portion 59 (the portion on the angle sensor 67 side) is connected to the right bracket 71 via the connecting hole 59b of the substrate portion 59.

In the left operating device 58, one part of the board portion 59 (the part on the worm gear mechanism 64 and the electric motor 65 side) is connected to the left bracket 72 via the connecting hole 59a of the board portion 59. The other portion of the substrate portion 59 (the portion on the angle sensor 67 side) is connected to the left bracket 70 via the connecting hole 59b of the substrate portion 59.

The board portions 59 of the right and left operating devices 58 are supported so as to be aligned in the left-right direction while facing the right and left transmissions 25 and 26.
One part of the board part 59 of the right operating device 58 (the part on the worm gear mechanism 64 and the electric motor 65 side) and one part of the board part 59 of the left operating device 58 (the part on the worm gear mechanism 64 and the electric motor 65 side). The portions) are arranged on opposite sides of each other in the front-rear direction, which is a direction orthogonal to the left-right direction in a plan view.

The worm gear mechanism 64 and the electric motor 65 of the right operating device 58 extend to the left from one portion of the board portion 59 of the right operating device 58 toward the substrate portion 59 of the left operating device 58. The worm gear mechanism 64 and the electric motor 65 of the left operating device 58 extend rightward from one portion of the board portion 59 of the left operating device 58 toward the substrate portion 59 of the right operating device 58.

With the above configuration, the right operating device 58 is supported above the right transmission 25, the left operating device 58 is supported above the left transmission 26, and the right operating device 58 and the left operation. The device 58 and the device 58 are arranged in a point-symmetrical state in a plan view.

In the operating device 58 on the right, one portion of the substrate portion 59 (the portion on the worm gear mechanism 64 and the electric motor 65 side) is lower than the other portion of the substrate portion 59 (the portion on the angle sensor 67 side). The substrate portion 59 is diagonally supported in a side view.

In the operating device 58 on the left, one part of the board portion 59 (the part on the worm gear mechanism 64 and the electric motor 65 side) is higher than the other part of the board part 59 (the part on the angle sensor 67 side). The substrate portion 59 is diagonally supported in a side view.
As described above, in the right and left operating devices 58, the substrate portion 59 is diagonally supported so that there is a difference in height between one portion and the other portion of the substrate portion 59 in a side view. ..

(Structure of connection between transmission and operation device)
As described above (configuration of the transmission system inside the mission case), the transmissions 25 and 26 are configured as a hydrostatic continuously variable transmission type, and can continuously change gears to the forward side and the reverse side. It is configured in.

As shown in FIGS. 4 and 5, the transmission units 25a and 26a, which are trunnion shafts for steplessly shifting the transmissions 25 and 26 ( hydraulic pumps 25b and 26b) to the forward side and the reverse side, are the transmissions 25 and 26. It is provided diagonally backward and upward from the upper surface of the.

In the right and left operating devices 58, the operating shaft 61 is provided diagonally forward and downward from the substrate portion 59. The axis of the transmission units 25a and 26a of the transmission devices 25 and 26 and the axis of the operation shaft 61 of the operation device 58 coincide with each other.

As shown in FIGS. 6 and 14, the right relay shaft 73 is connected to the transmission unit 25a of the right transmission 25 and the operation shaft 61 of the right operation device 58, and the right operation device 58 is connected. The operation shaft 61 of the above is connected to the transmission unit 25a of the right transmission 25.

The left relay shaft 73 is connected to the transmission unit 26a of the left transmission 26 and the operation shaft 61 of the left operation device 58, and the operation shaft 61 of the left operation device 58 is the left transmission 26. It is connected to the transmission unit 26a of the above.

With the above configuration, as described in the above (configuration of the operating device capable of operating the transmission), the pinion gear 64a of the worm gear mechanism 64 is rotationally driven by the electric motor 65 in the forward and reverse directions, and the operating shaft 61 (operation arm). When 62) is rotated around the shaft core P2 in the forward and reverse directions, the transmission units 25a and 26a of the transmissions 25 and 26 are rotated in the forward and reverse directions via the relay shaft 73, and the transmissions 25 and 26 move forward. The speed change is steplessly operated to the side and the reverse side.

(Remote control of work platform)
A control device (not shown), a receiver (not shown), an elevating control valve (not shown) for supplying and discharging work oil to the elevating cylinder 35 (see the above-mentioned (configuration of the mowing device)), and a work clutch 42. A work control valve (not shown) or the like for supplying / discharging work oil is provided in the machine body 1 (see the above-mentioned (configuration of the transmission system inside the mission case)).

The control signal of the transmitter (not shown) operated by the operator is transmitted to the receiver, the elevating control valve and the work control valve are operated by the control device, and the elevating cylinder 35 raises and lowers the mowing device 3 and works. The operation and stop operation of the mowing device 3 are performed by the clutch 42.

The control signal of the transmitter operated by the operator is transmitted to the receiver, and the control device activates the electric motor 65 of the right and left operating devices 58 (see the above-mentioned (configuration of the operating device capable of operating the transmission)). Then, the transmission units 25a and 26a of the transmission devices 25 and 26 are rotated.
By separately shifting the right transmission 25 and the left transmission 26 to the forward side and the reverse side, the aircraft 1 can turn right and left in forward and reverse, stop, forward and reverse, and right. And you can make a turn to the left and a super turn.

(First alternative form of carrying out the invention)
The output shaft 48 of the engine 45 may be arranged so as to be displaced to the left from the input shaft 27 (left-right center A1 of the machine body 1) of the mission case 20 in a plan view.
According to this configuration, the cylinder 47 of the engine 45 is viewed from the front so as to extend from the crankcase 46 in the left-right direction toward the input shaft 27 (left-right center A1 of the airframe 1) of the mission case 20 in a plan view. It is arranged diagonally (from the rear view) and extends to the right beyond the left and right center A1 of the aircraft 1.

(Second alternative form of carrying out the invention)
The output shaft 48 of the engine 45 may be arranged at the same position in the left-right direction (left-right center A1 of the machine body 1) with respect to the input shaft 27 of the mission case 20 in a plan view.
According to this configuration, the gear transmission portion 53 of the transmission mechanism 52 is not arranged diagonally in the front view (rear view), but extends upward from the crankcase 46 of the engine 45 in the side view and the front view in a vertical state. Is issued.

(Third alternative form of carrying out the invention)
In the mission case 20, the right case portion 22 and the left case portion 23 may be configured to extend from the right portion and the left portion of the central case portion 21 toward the side opposite to the engine 45.
According to this configuration, the output shaft 48 of the engine 45 and the input shaft 27 of the mission case 20 can be brought close to each other in the front-rear direction. Therefore, the transmission shaft 54 is abolished in the transmission mechanism 52, and the transmission mechanism 52 is eliminated. The output shaft 56 of the gear transmission unit 53 can be directly connected to the input shaft 27 of the transmission case 20.

(Fourth alternative form of carrying out the invention)
Instead of the transmission mechanism 52 having the gear transmission portion 53 and the transmission shaft 54, the output shaft 48 of the engine 45 and the input shaft 27 of the transmission case 20 are passed through two universal joints (not shown). A transmission mechanism 52 may be provided by connecting a transmission shaft (not shown) so that the transmission shaft is obliquely arranged in a side view (or both a side view and a plan view).

(Fifth alternative form of carrying out the invention)
In FIGS. 1 to 14, the work vehicle may have the front direction F and the rear direction B reversed so that the engine 45 side becomes the front direction F and the mowing device 3 side becomes the rear direction B.
According to this configuration, the engine 45 is arranged on the front side with respect to the mission case 20.

(Sixth Alternative Form of Implementation of the Invention)
The lower parts of the right and left drive wheels 15 and the front and rear intermediate portions of the right and left track frames 4 may be arranged so as to partially overlap each other in a side view.

(7th alternative form of carrying out the invention)
The laterally outer portions of the right case portion 22 and the left case portion 23 of the mission case 20 may be connected to the right and left track frames 4.
According to this configuration, the right case portion 22 and the left case portion 23 of the mission case 20 are viewed in a plan view while maintaining the state in which the drive wheels 15 are arranged above the front and rear intermediate portions of the track frame 4 in a side view. Can be configured so as not to overlap with the right and left track frames 4.

(Eighth alternative form of carrying out the invention)
The lower parts of the right and left drive wheels 15 and the front and rear intermediate portions of the right and left track frames 4 may be arranged so as to partially overlap each other in a side view.

(9th alternative form of carrying out the invention)
The mission case 20 may be connected across the right and left track frames 4 so that the right and left drive wheels 15 are located at the front or rear ends of the right and left track frames 4.
According to this configuration, the right case portion 22 and the left case portion 23 of the mission case 20 can be configured so as not to overlap with the right and left track frames 4 in a plan view.

(10th alternative form of carrying out the invention)
Instead of the hydrostatic type continuously variable transmission type transmissions 25 and 26, belt continuously variable transmission type transmissions 25 and 26 having a forward / backward switching mechanism may be used.

(Eleventh alternative form of carrying out the invention)
In FIGS. 1 to 14, the work vehicle may have the front direction F and the rear direction B reversed so that the engine 45 side becomes the front direction F and the mowing device 3 side becomes the rear direction B.
According to this configuration, the right and left support frames 8 are connected to the rear portion of the right and left track frames 4 with respect to the mission case 20, and extend upward.

(12th alternative embodiment of the invention)
The configurations of the right and left operating devices 58 shown in FIG. 14 are arranged on the front side or the rear side with respect to the right and left transmissions 25 and 26, and the board portions 59 of the right and left operating devices 58 are left and right. It may be arranged along the vertical direction orthogonal to the direction.

(13th Form of Implementation of the Invention)
In the operating device 58, the worm gear mechanism 64 and the electric motor 65 may be configured to extend from the substrate portion 59 in the direction opposite to that in FIG.
According to this configuration, in FIG. 14, the worm gear mechanism 64 and the electric motor 65 of the right operating device 58 are from the front portion (upper portion) which is one part of the board portion 59 of the right operating device 58 to the left operating device. It extends to the left toward the substrate portion 59 of 58.
The worm gear mechanism 64 and the electric motor 65 of the left operating device 58 are directed to the right from the rear portion (lower portion), which is one part of the board portion 59 of the left operating device 58, toward the substrate portion 59 of the right operating device 58. It will be postponed.

(14th alternative form of carrying out the invention)
In the configuration shown in FIG. 14, in the operating device 58 on the right, one part of the board portion 59 (the part on the worm gear mechanism 64 and the electric motor 65 side) is the other part of the board portion 59 (the part on the angle sensor 67 side). The substrate portion 59 may be supported obliquely in a side view so as to be higher than the above.
In the operating device 58 on the left, one part of the board portion 59 (the part on the worm gear mechanism 64 and the electric motor 65 side) is lower than the other part of the board part 59 (the part on the angle sensor 67 side). The substrate portion 59 may be supported obliquely in a side view.

(Fifteenth alternative form of carrying out the invention)
In FIGS. 1 to 14, the work vehicle may have the front direction F and the rear direction B reversed so that the engine 45 side becomes the front direction F and the mowing device 3 side becomes the rear direction B.

In the present invention, instead of the mowing device 3, a work vehicle equipped with another work device such as a snow removal device (not shown), or a crawler type traveling device 2, a plurality of traveling wheels are used as a traveling device. It can also be applied to the work vehicle used as No. 2, and can be applied not only to the work vehicle operated remotely, but also to the work vehicle on which the worker is boarded and operated.

2 Traveling device 3 Mowing device (working device)
4 Track frame 8 Support frame 15 Drive wheel 16 Rolling wheel 19 Crawler belt 20 Mission case 21 Central case part 22 Right case part 23 Left case part 25 Transmission 25a Transmission 26 Transmission 26a Transmission 27 Input shaft 30 Bracket 33 Work frame 35 Lifting cylinder 45 Engine 46 Crankcase 47 Cylinder 48 Output shaft 49 Air cleaner 50 Muffler 51 Fuel tank 52 Transmission mechanism 53 Gear transmission part 54 Transmission shaft 58 Operation device 59 Board part 61 Operation shaft 62 Operation arm 64 Warm gear mechanism (actor)
65 Electric motor (actuator)
65b Coupler 67 Angle sensor 73 Relay shaft L1 Length L2 Length P1 Jikushin

Claims (21)

1. Right and left running with drive wheels, a plurality of wheels, a track frame on which the wheels are supported and arranged along the front-rear direction, and a crawler belt attached to the drive wheels and the wheels. Equipped with equipment,
   A mission that supports the drive wheels of the right traveling device and the driving wheels of the left traveling device so that the driving wheels are arranged on the upper side with respect to the front-rear intermediate portion of the truck frame in a side view. Equipped with a case,
   An engine arranged on the front side or the rear side with respect to the mission case and arranged between the right and left traveling devices in a plan view.
   An input shaft supported by the mission case so as to project toward the engine,
   An output shaft that is arranged at a position lower than the input shaft in a side view and is supported by the engine so as to project toward the mission case.
   A transmission mechanism connected over the output shaft and the input shaft is provided.
   The power of the engine is transmitted from the output shaft to the input shaft via the transmission mechanism, transmitted to the drive wheels via the transmission system inside the transmission case, and the drive wheels are rotationally driven. Work vehicle.
2. The work vehicle according to claim 1, wherein the engine is arranged so as to overlap the rotation path of the crawler belt in a side view.
3. In the mission case
   A central case portion that supports the input shaft and is arranged along the left-right direction,
   A right case portion that supports the right drive wheel, is connected to the right portion of the central case portion, and extends toward the engine side.
   The work vehicle according to claim 1 or 2, wherein the left drive wheel is supported, and a left case portion connected to the left portion of the central case portion and extended toward the engine side is provided.
4. To the transmission mechanism
   A gear transmission unit that is supported by the crankcase of the engine, is connected to the output shaft, and extends upward from the crankcase in the vertical direction in a side view.
   The work vehicle according to any one of claims 1 to 3, which is arranged along the front-rear direction and is provided with a transmission shaft connected to the gear transmission unit and the input shaft.
5. The crankcase is arranged so that the output shaft is displaced from the input shaft to the left or right side in a plan view.
   The work vehicle according to claim 4, wherein the gear transmission portion is arranged obliquely in a front view so as to extend from the crankcase in a plan view toward the input shaft in a left-right direction.
6. The work vehicle according to claim 5, wherein the cylinder of the engine is arranged diagonally in a front view so as to extend from the crankcase in a plan view toward the input shaft in the left-right direction.
7. The work vehicle according to claim 6, wherein the air cleaner for intake of the engine and the muffler for exhaust of the engine are arranged above the cylinder.
8. The work vehicle according to claim 6 or 7, wherein the fuel tank for the engine is arranged above the crankcase.
9. Right and left running with drive wheels, a plurality of wheels, a track frame on which the wheels are supported and arranged along the front-rear direction, and a crawler belt attached to the drive wheels and the wheels. Equipped with equipment,
   An engine, a drive wheel of the right traveling device, and a mission case supporting the driving wheel of the left traveling device are provided.
   The power of the engine is transmitted to the input shaft of the mission case, transmitted to the drive wheels via the transmission system inside the mission case, and the drive wheels are rotationally driven.
   In the mission case, a central case portion that supports the input shaft and is arranged along the left-right direction and a right case that supports the drive wheels of the right traveling device and is connected to the right portion of the central case portion. A portion and a left case portion that supports the drive wheel of the left traveling device and is connected to the left portion of the central case portion are provided.
   The right case portion is connected to the track frame of the right traveling device, the left case portion is connected to the track frame of the left traveling device, and the mission case is connected to the right and left track frames. The work vehicle that has been.
10. A right transmission system capable of shifting the power transmitted to the input shaft forward and backward and transmitting the power to the right drive wheel is provided in the transmission system of the mission case.
    The work vehicle according to claim 9, wherein the left transmission device capable of shifting the power transmitted to the input shaft forward and backward and transmitting the power to the left drive wheel is provided in the transmission system of the transmission case.
11. The right drive wheel is arranged above the front-rear middle portion of the right track frame in a side view.
    The work vehicle according to claim 9 or 10, wherein the left drive wheel is arranged on the upper side with respect to the front-rear intermediate portion of the left truck frame in a side view.
12. The right case portion is arranged so as to overlap the right track frame in a plan view.
    The work vehicle according to claim 11, wherein the left case portion is arranged so as to overlap the left track frame in a plan view.
13. The right drive wheel is supported by a lateral outer portion of the right case portion,
    The portion of the right case portion opposite to the right drive wheel and the right track frame are connected via a right bracket.
    The left drive wheel is supported by a lateral outer portion of the left case portion,
    The invention according to any one of claims 9 to 12, wherein a portion of the left case portion opposite to the left drive wheel and the left track frame are connected via a left bracket. Work vehicle.
14. The right and left support frames are connected to the front or rear portion of the right and left track frames with respect to the mission case and extend upward.
    A work frame that can support the work device is supported by swinging up and down around the axis along the left-right direction.
    An elevating cylinder capable of swinging the work frame up and down is connected to the support frame and the work frame.
    The work vehicle according to any one of claims 9 to 13, wherein the right support frame and the mission case are connected, and the left support frame and the mission case are connected.
15. The right and left traveling devices, the right and left transmissions that can transmit power to the right and left traveling devices and are arranged so as to line up in the left-right direction, and the right and left transmissions that can operate the right and left transmissions. And the left operating device
    To the operating device
    A substrate portion, an operation shaft rotatably supported by the substrate portion, and
    An actuator that is supported by one portion of the substrate portion and is capable of rotating the operation shaft is provided so as to extend from the substrate portion in a direction intersecting the substrate portion.
    In the board portion, the operating shaft, and the actuator of the right operating device, and the substrate portion, the operating shaft, and the actuator of the left operating device.
    In a state where one part of the right substrate portion and one portion of the left substrate portion are arranged on opposite sides of each other in a direction orthogonal to the left-right direction, the right and left substrate portions are arranged on the right side. And supported so as to line up in the left-right direction while facing the left transmission
    The right actuator extends from one portion of the right substrate portion toward the left substrate portion, and the left actuator extends from one portion of the left substrate portion to the right substrate portion. Deferred towards
    A work vehicle in which the right operating shaft is connected to the transmission of the right transmission and the left operation shaft is connected to the transmission of the left transmission.
16. The right operating device is supported above the right transmission, and the left operating device is supported above the left transmission.
    The work vehicle according to claim 15, wherein one portion of the right substrate portion and one portion of the left substrate portion are arranged on opposite sides of each other in the front-rear direction in a plan view.
17. The transmission unit is provided upward from the transmission, and the operation shaft is provided downward from the substrate unit.
    16. The 16th aspect of claim 16, wherein the relay shaft is connected over the transmission and the operation shaft, the rotation of the operation shaft is transmitted to the transmission via the relay shaft, and the transmission is operated. Work vehicle.
18. The work vehicle according to claim 16 or 17, wherein the substrate portion is diagonally supported so that there is a difference in height between one portion and the other portion of the substrate portion in a side view.
19. An operation arm connected to the operation shaft extends from the operation shaft toward one portion and the other portion of the substrate portion.
    One part of the operation arm is operated by the actuator supported by one part of the substrate portion, and the operation shaft is rotated.
    Any one of claims 15 to 18, wherein an angle sensor that detects the rotation angle of the operating shaft by detecting the position of the other portion of the operating arm is supported by the other portion of the substrate portion. The work vehicle described in item 1.
20. The length of the operation shaft in the substrate portion and the end portion of one portion of the substrate portion is larger than the length of the operation shaft in the substrate portion and the end portion of the other portion of the substrate portion. The work vehicle according to claim 19, which is set to be a long one.
21. The actuator is an electric motor
    The work vehicle according to any one of claims 15 to 20, wherein the coupler of the electric motor to which the harness is connected is supported on the operation shaft side with respect to the electric motor.
    

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