JP7145841B2 - work machine - Google Patents

Description

The present invention relates to working machines.

Some work machines are equipped with a ground work device positioned in front or rear of the traveling machine body, and are configured to support the ground work machine on the traveling machine body in a state in which it can be lifted and lowered and can be rolled. .

As a working machine of this type, for example, there is a lawn mower disclosed in Patent Document 1. In this lawn mower, a mowing device as a ground working device is provided in front of a self-propelled body as a traveling body. A link mechanism is provided to connect the mowing device to the self-propelled body in a state in which the mowing device can be operated up and down and rolled.

JP-A-4-200312

Conventionally, the mower is equipped with a hydraulic motor for driving the mower, and the weight of the mower is increased not only by the hydraulic motor but also by gears for transmitting the power of the hydraulic motor to the cutting blades. As described above, when the weight of the ground working device positioned at the front or the rear of the traveling machine body becomes heavy, the ground working device can easily roll, so it tends to wobble. In addition, the weight of the traveling machine body must be increased so as to balance the weight of the ground working device and the weight of the traveling machine body, which increases the weight of the working machine as a whole.

The present invention provides a work machine capable of suppressing weight increase of the ground work device.

A work machine according to the present invention includes:
a traveling machine body, a ground working device positioned in front or rear of the traveling machine body, a state provided over the traveling machine body and the ground working device, and a state in which the ground working device can be operated up and down with respect to the traveling machine body; A connection mechanism that connects the ground work device to the traveling machine body in a state in which the ground work machine can roll with respect to the traveling machine body; and a power transmission mechanism that transmits power from the traveling machine body to the ground work machine. The connection mechanism includes a support frame extending from the traveling machine body toward the ground work device so as to be capable of swinging up and down, a connection frame portion provided in the ground work device, a free end portion of the support frame, and the A rolling support section provided over a connecting frame section and supporting the connecting frame section so as to be able to swing about the rolling axis as a swinging fulcrum, and a swinging operation of the supporting frame with respect to the traveling machine body. and a lifting cylinder, wherein the power transmission mechanism is configured to be connected to a relay transmission case supported at a portion of the free end portion separated from the rolling support portion, and an output shaft provided on the traveling machine body. a first rotary transmission shaft extending along the longitudinal direction of the machine body toward the relay transmission case to input the power of the output shaft to the relay transmission case; a second rotary transmission shaft for transmitting the output of the relay transmission case; a transmission mechanism portion that extends in the longitudinal direction and transmits power of the second rotary transmission shaft to the input shaft, the end portion of the first rotary transmission shaft on the output shaft side; , a universal joint portion is provided at an end of the first rotary transmission shaft on the relay transmission case side, and an end of the second rotary transmission shaft on the relay transmission case side and at the second rotary transmission shaft A universal joint is provided at the end on the transmission mechanism side.

According to this configuration, when the ground working device is raised and lowered by raising and lowering the support frame with respect to the traveling machine body, the relay transmission case is raised and lowered together with the free end portion of the support frame, and the first rotary transmission shaft is freely positioned on the output shaft side. Since the joint part is used as the swinging fulcrum, the support frame moves up and down without receiving resistance from the first rotation transmission shaft, and the ground work device moves up and down smoothly. When the ground work device rolls with the connecting frame portion using the rolling support portion as a swing fulcrum, the transmission mechanism moves up and down together with the ground work device, and the second rotary transmission shaft swings at the universal joint portion on the relay transmission case side as a swing fulcrum. As a result, the relay transmission case swings without being resisted by the second rotation transmission shaft, and the ground working device rolls. And, by providing a transmission mechanism, power can be transmitted from the traveling machine body to the ground working device, and the ground working device does not need to be provided with a power source. Furthermore, since the rolling support part and relay transmission case are separated from each other, the structure of the rolling support part can be simplified compared to matching the rolling axis and the axis of the transmission shaft, and the weight of the rolling support part can be reduced. Since the weight reduction can be suppressed, the weight increase of the ground working device can be suppressed.

In the present invention,
It is preferable that the relay transmission case is supported at a portion of the free end portion that is deviated downward from the rolling support portion.

According to this configuration, the relay transmission case can be easily handled from below the support frame, so that it is easy to inspect the relay transmission case.

In the present invention,
It is preferable that the transmission mechanism section is a belt transmission mechanism that transmits the power of the second rotation transmission shaft to the input shaft by means of an endless rotating belt.

According to this configuration, since the transmission mechanism is composed of the endless rotary belt which is lighter than the transmission shaft, the weight of the transmission mechanism can be suppressed, and the weight of the ground working device can be further suppressed.

In the present invention,
It is preferable that the free end portion is detachably attached to the support frame.

According to this configuration, by separating the free end portion and the support frame, the ground working device can be removed without disassembling the rolling support portion.

In the present invention,
The ground working device is preferably a mowing device.

According to this configuration, it is possible to suppress the increase in weight of the mowing device, so that when mowing is performed while the mowing device is grounded, the ground contact load can be suppressed so as not to be too heavy.

It is a right side view showing the whole lawn mower. It is a top view which shows the whole lawn mower. Fig. 3 is a right side view showing the coupling mechanism and the grass cutting device in a vertical section; FIG. 4 is a perspective view showing a disassembled coupling mechanism and a disassembled power transmission mechanism; It is a rear view showing a lower engaging/disengaging part and an upper engaging/disengaging part. It is a side view which shows a lower engaging-and-disengaging part. FIG. 4 is a front view showing a rolling support, a rolling lock mechanism, and a rolling guide; It is a top view which shows a power transmission mechanism.

An embodiment, which is an example of the present invention, will be described below with reference to the drawings.
1, 2, and 4, the direction of the arrow F shown in FIGS. 1, 2 and 4 is the "body front", and the direction of the arrow B is the "body rear". , the direction of arrow U shown in FIGS. shall be referred to as the “right side of the fuselage”.

[Overall configuration of lawn mower]
As shown in FIGS. 1 and 2, the mower includes a traveling body 2 equipped with a pair of left and right crawler type traveling devices 1, and a mowing device 10 as a ground work device positioned in front of the traveling body 2. there is A connection mechanism K is provided across the grass cutting device 10 and the traveling machine body 2 to connect the grass cutting machine 10 to the traveling machine body 2 in such a state that the grass cutting machine 10 can be moved up and down. The traveling body 2 has a driving section 3 formed between the left and right traveling devices 1 . The driving unit 3 is provided with an engine 4 and a transmission 5 provided in front of the engine 4 . The engine 4 and transmission 5 are covered with a cover 6 from above. The power of the engine 4 is input to the transmission 5 and is changed into driving power and working power, the driving power is output to the left and right traveling devices 1, and the working power is output to the mowing device 10. . The traveling machine body 2 is equipped with a control device (not shown) for operating the traveling device 1 and the grass cutting device 10 . The control device receives a control command from a radio control device (not shown), and based on the received control command, controls operations such as steering of the traveling machine 2, operations such as driving and stopping the traveling device 1, and controls the mowing device 10. It is configured to perform operations such as driving and stopping of the. The lawn mower can be remotely controlled by a radio control device. The mower is a so-called radio-controlled mower.

[Configuration of lawn mower]
The mowing device 10 has a cutting blade housing 11 as shown in FIGS. Inside the cutting blade housing 11, a cutting blade 12 having a support shaft 12a extending along the width direction of the traveling body 2 is provided. The cutting blade 12 has a plurality of knife blades (not shown) attached to the outer periphery of the support shaft 12a. The mower 10 is configured as a so-called flail mower.

As shown in FIGS. 1 and 2, ground sleds 13 for setting the cutting height of the cutting blades 12 are provided below both lateral ends of the cutting blade housing 11 . A rear end portion of the ground sled 13 is supported by the cutting blade housing 11 via a support shaft 13a. A front end portion of the ground sled 13 is supported by the cutting blade housing 11 via a cutting height adjusting rod 14 . By changing the connecting position of the cutting height adjusting rod 14 to the cutting blade housing 11, the grounding sled 13 swings up and down with respect to the cutting blade housing 11 with the support shaft 13a as the swinging fulcrum. The height of the point with respect to the cutting blade housing 11 is changed, and the cutting height of grass cutting can be adjusted.

As shown in FIG. 3, the lower rear portion of the cutting blade housing 11 is supported by the lower portion of a plate-shaped connecting frame portion 40 positioned behind the cutting blade housing 11 via a support shaft 11a. As shown in Figs. An adjustable mounting angle adjustment rod 16 is connected. By extending and contracting the mounting angle adjusting rod 16, the cutting blade housing 11 swings up and down with respect to the connecting frame portion 40 with the support shaft 11a as a swinging fulcrum. can be changed.

As shown in FIGS. 1, 2 and 3, a sheet-like cover member 17 for covering the cutting blade 12 from the front is suspended from the front portion of a support portion 18 formed in the front portion of the cutting blade housing 11 . The support portion 18 is supported by the cutting blade housing 11 so as to be vertically swingable. A vertically adjustable lifting adjusting rod 19 is connected across an adjusting rod support portion 18 a provided on the support portion 18 and a second joint rod support portion 11 c provided on the cutting blade housing 11 . By extending and contracting the elevation adjusting rod 19, the support portion 18 swings up and down, and the cover member 17 can be adjusted up and down.

[Construction of Coupling Mechanism]
The connecting mechanism K is configured to connect the mowing device 10 to the traveling body 2 in a state in which the mowing device 10 can be moved up and down, the mowing device 10 can be attached and detached, and the mowing device 10 can roll. Specifically, the connection mechanism K has a support frame 20, a relay frame 30, and a connection frame portion 40, as shown in FIGS.

As shown in FIGS. 1, 2 and 3, a pair of left and right strut frames 7 are provided at the front of the traveling body 2 .

As shown in FIG. 4 , the support frame 20 has a pair of left and right swing arms 21 and a connecting frame 22 that connects the front ends of the left and right swing arms 21 . Arm support portions 7a are formed in the lower portions of the left and right column frames 7 . As shown in FIGS. 2 and 3 , the rear end portion of the left swing arm 21 is supported by the arm support portion 7 a of the left support frame 7 via a support shaft 23 . A rear end portion of the right swing arm 21 is supported by an arm support portion 7 a of the right support frame 7 via a support shaft 23 . The left and right swing arms 21 extend forward from the support frame 7 so as to swing up and down with the axis P of the support shaft 23 as a swing fulcrum.

As shown in FIG. 4, cylinder support portions 7b are formed on the upper portions of the left and right column frames 7, and cylinder support portions 21a are formed on intermediate portions of the left and right swing arms 21 in the front-rear direction. As shown in FIGS. 2 and 3, a left elevating cylinder for raising and lowering the left swing arm 21 is attached to the cylinder support portion 21a of the left swing arm 21 and the cylinder support portion 7b of the left strut frame 7. 24 are connected. A right elevating cylinder 24 for raising and lowering the right swing arm 21 is connected to the cylinder support portion 7b of the right swing arm 21 and the cylinder support portion 7b of the right strut frame 7 . In the left and right strut frames 7, the cylinder support portion 7b is provided above the arm support portion 7a. The left and right elevating cylinders 24 are provided in a downwardly inclined state in which the position closer to the swing arm 21 is positioned lower. The left and right elevating cylinders 24 are configured by hydraulic cylinders.

The support frame 20 extends from the traveling machine body 2 toward the mowing device 10 in a state in which it can swing vertically with respect to the traveling machine body 2 with the axis P as a swinging fulcrum. be done.

As shown in FIG. 4 , the relay frame 30 has a U-shaped outer frame portion 31 that opens downward when viewed in the longitudinal direction of the aircraft body, and a plate-like inner member 32 . The inner member 32 is connected to the outer frame portion 31 while positioned inside the outer frame portion 31, as shown in FIG. The relay frame 30 is connected to the front portion of the support frame 20 as shown in FIGS. The relay frame 30 forms a free end portion to which the connection frame portion 40 of the support frame 20 is connected.

As shown in FIG. 5 , a pair of left and right lower engagement/disengagement portions 50 are provided across the lower portion of the relay frame 30 and the front lower portion of the support frame 20 to allow the relay frame 30 to be attached/detached to/from the support frame 20 . An upper engaging/disengaging portion 60 is provided between the upper portion of the relay frame 30 and the upper portion of the support frame 20 to allow the relay frame 30 to be attached/detached to/from the support frame 20 . The lower engaging/disengaging portion 50 and the upper engaging/disengaging portion 60 enable the mowing device 10 to be attached/detached between the relay frame 30 and the support frame 20 .

Specifically, as shown in FIGS. 5 and 6, the left and right lower engagement/disengagement portions 50 are composed of connecting pins 51 protruding inward from the lower portion of the outer frame portion 31 of the relay frame 30, and the support frame 20. and a connecting hook 53 which is swingably supported via a support shaft 52 at the front end portion of the swing arm 21 at. A spring connection portion 54 is formed in the connection frame 22 of the support frame 20 . One end of the spring 55 is connected to the spring connecting portion 54 , and the other end of the spring 55 is connected to the connecting hook 53 . As shown in FIGS. 5 and 6, the spring 55 is connected to the connecting hook 53 by connecting the spring 55 to the lateral end 56a of the interlocking member 56 connected to the connecting hook 53. As shown in FIGS.

A connecting pin 51 is engaged with a notch portion 21b formed in the front end portion of the swing arm 21, and the connecting hook 53 is swung with the support shaft 52 as a swinging fulcrum, and the free end portion of the connecting hook 53 is moved. When engaged with the connecting pin 51, the connecting hook 53 is in a connected state. When the connecting hooks 53 are connected, the left and right lower engagement/disengagement portions 50 are in a connected state so as to connect the lower portion of the relay frame 30 and the front lower portion of the support frame 20 . When the connecting hook 53 is in the connected state, the spring 55 urges the connecting hook 53 to the connected state due to the swinging motion of the connecting hook 53, and the lower engaging/disengaging portion 50 is maintained in the connected state.

When the free end of the connecting hook 53 is separated from the connecting pin 51, the connecting hook 53 is in the disconnected state. The left and right lower engagement/disengagement portions 50 are brought into a connection release state so as to release the connection between the lower portion of the relay frame 30 and the front lower portion of the support frame 20 by the connection hook 53 being in the connection release state. When the connecting hook 53 is in the disconnected state, the swinging of the connecting hook 53 causes the spring 55 to bias the connecting hook 53 to the disconnected state, and the lower engaging/disengaging portion 50 is maintained in the disconnected state.

As shown in FIG. 5 , an interlocking member 56 is connected across the free end of the connecting hook 53 in the left lower engaging/disengaging portion 50 and the free end of the connecting hook 53 in the right lower engaging/disengaging portion 50 . are interlocked by an interlocking member 56 so that the connecting hooks 53 of the two swing in the same swinging direction. The interlocking member 56 includes a left lateral end portion 56a extending inwardly from the left connecting hook 53, a right lateral end portion 56a extending inwardly from the right connecting hook 53, and an upper portion of the left and right lateral end portions 56a. , and has an intermediate portion 56b that bypasses a relay input shaft 91a, which will be described later, and vertical connecting portions 56c that interlock and connect the intermediate portion 56b to the left and right lateral end portions 56a. The intermediate portion 56b passes above the relay input shaft 91a along the left-right direction of the machine body.

When the intermediate portion 56b of the interlocking member 56 is operated up and down, the operating force is transmitted to the left and right connecting hooks 53 by the interlocking member 56, and the left and right connecting hooks 53 are interlocked to switch between the connected state and the unconnected state. be done. The intermediate portion 56b serves as an operation tool for interlocking the left and right connecting hooks 53 for switching operation.

As shown in FIG. 5, the upper engagement/disengagement portion 60 includes a support portion 61 provided on the upper portion of the connection frame 22 of the support frame 20 and a pair of left and right connection portions provided on the outer frame portion 31 of the intermediate frame 30. 62 and .

The upper engaging/disengaging part 60 is a detachable connection between the left and right connecting parts 62 in which the supporting part 61 is inserted between the left and right connecting parts 62 and sandwiches the supporting part 61 from both lateral sides, and the supporting part 61. By attaching the pin 63 , the upper portion of the relay frame 30 and the front upper portion of the support frame 20 are connected to each other. When the connecting pin 63 is pulled out, the upper engaging/disengaging portion 60 is in a disconnected state so as to release the connection between the upper portion of the relay frame 30 and the front upper portion of the support frame 20 .

As shown in FIG. 3 , the connecting frame portion 40 is provided at the rear portion of the mower 10 while being connected to the cutting blade housing 11 . The connecting frame portion 40 and the cutting blade housing 11 are connected to each other by the supporting shaft 11 a and the mounting angle adjusting rod 16 .

As shown in FIGS. 3 and 7, a rolling support portion 70 is provided across the connecting frame portion 40 and the relay frame 30 . The rolling support portion 70 allows the connection frame portion 40 to swing with respect to the relay frame 30 with the rolling axis X extending in the longitudinal direction of the traveling body 2 as a swing fulcrum. Allow rolling.

Specifically, as shown in FIGS. 3, 4, and 7, the rolling support portion 70 includes a rolling support shaft 71 projecting forward from the inner member 32 of the relay frame 30 and a rolling support shaft 71 that rotates relative to the rolling support shaft 71. and a boss portion 72 provided on the connecting frame portion 40 so as to be fitted on the outside.

As shown in FIG. 7 , rolling guides 73 for guiding the rolling of the connecting frame portion 40 are provided on both lateral sides of the rolling support portion 70 . As shown in FIGS. 4 and 7, the left and right rolling guides 73 protrude forward from the inner member 32 of the relay frame 30 in a state of engaging with guide holes 74 formed in the connecting frame portion 40 and the guide holes 74 . and a guide pin 75 provided.

When the weight on the left side and the weight on the right side of the mowing device 10 are balanced, a spring that pulls up the left side of the cutting blade housing 11 or the connecting frame portion 40 and the cutting blade housing 11 or the connecting frame. If a spring is provided to pull up and bias the right lateral side of the portion 40, the left and right springs can bias the mowing device 10 to a neutral posture during rolling. If the right lateral side of the mowing device 10 is heavier than the left lateral side, the left lateral side of the mowing device 10 can be made to be the right lateral side by simply providing a spring that pulls up and urges the right lateral side of the cutting blade housing 11 or the connecting frame portion 40 . If the mower 10 is heavier than the mower 10, the lawn mower 10 can be urged to a rolling neutral posture simply by providing a spring that pulls up the left lateral side of the cutting blade housing 11 or the connecting frame portion 40 and urges it.

As shown in FIG. 7 , a rolling lock mechanism 80 is provided across the connecting frame portion 40 and the relay frame 30 . The rolling lock mechanism 80 is provided over the upper portion of the connecting frame portion 40 and the upper portion of the relay frame 30 so that it can be easily operated from above the relay frame 30 .

Specifically, as shown in FIG. 7, the rolling lock mechanism 80 includes a rolling hook 82 that is swingably supported by the inner member 32 of the relay frame 30 via a support shaft 81, and a connecting frame portion 40. and a notch 83 formed therein. A free end of the rolling hook 82 is provided with a rod-shaped operating tool 84 for swinging the rolling hook 82 .

When the rolling hook 82 is pivoted about the pivot 81 and the tip of the rolling hook 82 is engaged with the notch 83, the rolling hook 82 assumes a locked posture. The rolling lock mechanism 80 enters a locked state so as to restrict the rolling of the connecting frame portion 40 when the rolling hook 82 assumes the locked posture. In this case, the spring 86 connected to the spring supporting portion 85 provided on the outer frame portion 31 of the relay frame 30 and the operating tool 84 urges the rolling hook 82 to the locked posture by swinging the rolling hook 82 . As a result, the rolling lock mechanism 80 is maintained in the locked state by the spring 86 .

When the tip of the rolling hook 82 is extracted from the notch 83, the rolling hook 82 assumes the unlocked posture. The rolling lock mechanism 80 is in an unlocked state so as to allow rolling of the connecting frame portion 40 when the rolling hook 82 is in the unlocked posture. In this case, the spring 86 urges the rolling hook 82 to the unlocked posture by swinging the rolling hook 82 , and the rolling lock mechanism 80 is maintained in the unlocked state by the spring 86 .

[Power transmission mechanism]
As shown in FIGS. 2 and 8 , the traveling body 2 is provided with an output shaft 90 projecting forward from the front portion of the transmission 5 . The output shaft 90 is provided along the longitudinal direction of the traveling body 2 . Power that is input from the engine 4 to the transmission 5 and changed into working power is output from the output shaft 90 .

As shown in FIG. 8, the power transmission mechanism M that transmits power from the traveling body 2 to the mower 10 is provided with a relay transmission case 91 that is supported by the relay frame 30 as the free end of the support frame 20. ing. As shown in FIG. 4 , a case support portion 92 is formed at a portion of the inner member 32 of the relay frame 30 that is separated from the rolling support portion 70 , and the relay transmission case 91 is supported by the case support portion 92 . . The relay transmission case 91 is supported by a portion of the relay frame 30 that is separated from the rolling support portion 70 . Specifically, the case support portion 92 is formed at a portion of the inner member 32 of the relay frame 30 that is deviated downward from the rolling support portion 70 . As shown in FIG. 7 , the relay transmission case 91 is supported by the relay transmission case 91 at a location that is deviated downward from the rolling support portion 70 . As shown in FIGS. 4 and 7, an opening 93 is formed in the connecting frame portion 40, and the front portion of the relay transmission case 91 is inserted through the opening 93 and forwardly of the connecting frame portion 40, as shown in FIG. protrudes to The size of the opening 93 is set to avoid contact between the connecting frame portion 40 and the relay transmission case 91 when the connecting frame portion 40 rolls. As shown in FIGS. 4 and 8, the relay transmission case 91 includes a relay input shaft 91a projecting rearward from the rear portion of the relay transmission case 91, and a relay input shaft 91a protruding rearward from the right side portion of the relay transmission case 91. It has a relay output shaft 91b projecting from. The relay input shaft 91 a is provided along the longitudinal direction of the traveling body 2 . The relay output shaft 91b is provided along the left-right direction of the traveling body 2 .

As shown in FIG. 8, a first rotary transmission shaft 94 extends from the output shaft 90 toward the relay transmission case 91 along the longitudinal direction of the machine body, and the extended end of the first rotary transmission shaft 94 extends to the relay input. It is interlockingly connected to the shaft 91a. A universal joint portion 95 is provided at each of the output shaft side end of the first rotary transmission shaft 94 and the relay transmission case side end of the first rotary transmission shaft 94 . As shown in FIGS. 2 and 8, the first rotary transmission shaft 94 has a rotation center 95P of a universal joint portion 95 on the output shaft side of the first rotary transmission shaft 94 and a swinging motion of the swinging arm 21 with respect to the traveling body 2. The axis P, which is the axis center axis, is provided in a state of being positioned on the same line Z in the direction along the left-right direction of the traveling body 2 .

As shown in FIGS. 2 and 8, there is a transmission mechanism 99 that extends between the relay output shaft 91b of the relay transmission case 91 and the device input shaft 10a of the lawn mower 10 and transmits the power of the relay output shaft 91b to the device input shaft 10a. is provided. The device input shaft 10 a is configured by a support shaft 12 a of the cutting blade 12 .

Specifically, as shown in FIG. 8, the transmission mechanism 99 is a second rotary transmission that extends laterally outward from the relay output shaft 91b of the relay transmission case 91 along the lateral direction of the machine body. The shaft 96 extends along the longitudinal direction of the machine body from the extended end of the second rotary transmission shaft 96 toward the device input shaft 10a on the right lateral side of the mowing device 10. and a belt transmission mechanism 97 for transmitting power to the device input shaft 10a. The belt transmission mechanism 97 includes a transmission shaft pulley 97a provided on the second rotation transmission shaft 96, an input shaft pulley 97b provided on the device input shaft 10a, and an endless belt wound around the transmission shaft pulley 97a and the input shaft pulley 97b. It is configured by the belt 97c. A universal joint portion 98 is provided at each of the end portion of the second rotation transmission shaft 96 on the side of the relay transmission case and the end portion of the second rotation transmission shaft 96 on the side of the belt transmission mechanism.

In the power transmission mechanism M, the power of the output shaft 90, which rotates as the power of the engine 4 is transmitted through the transmission 5, is input to the relay transmission case 91 by the first rotary transmission shaft 94 and the relay input shaft 91a. The power of the relay output shaft 91b of the case 91 is transmitted to the belt transmission mechanism 97 by the second rotation transmission shaft 96, and transmitted from the belt transmission mechanism 97 to the device input shaft 10a.

The grass cutting device 10 is supported by the traveling body 2 via the support frame 20 and a relay frame 30 as a free end portion of the support frame 20 . When the left and right lifting cylinders 24 are operated to extend and retract, the relay frame 30 and the support frame 20 are lifted and lowered with respect to the support frame 7 with the axis P as the swinging fulcrum due to the extension and contraction of the lifting cylinders 24, and the grass cutting device 10 moves to the traveling body. 2. At this time, the relay transmission case 91 moves up and down together with the relay frame 30, and the rotation of the universal joint portion 95 where the first rotary transmission shaft 94 is positioned on the same line Z as the axis P, which is the swing axis of the support frame 20. It swings up and down with the center 95P as a swinging fulcrum, and the first rotary transmission shaft 94 does not become an obstacle to the mowing device 10 moving up and down.

When mowing the grass, the left and right elevating cylinders 24 are kept in a floating state. Then, even if the traveling machine body 2 tilts forward and backward, the left and right elevating cylinders 24 expand and contract due to the reaction force acting on the left and right ground contact sleds 13 and the load of the mowing device 10, and the relay frame 30 and the support frame 20 move. The grass cutting device 10 is grounded and supported by the left and right grounding sleds 13 by moving up and down with respect to the traveling body 2 , and the grass cutting device 10 cuts grass at a cutting height set by the grounding sleds 13 .

When mowing the grass, the rolling lock mechanism 80 is kept in the unlocked state. Then, even if the traveling machine body 2 tilts to the left or right, the connection frame portion 40 swings around the rolling axis X with respect to the relay frame 30 by grounding support of the grass cutting device 10 by the left and right grounding sledges 13 . Then, the mowing device 10 rolls with respect to the traveling body 2, and the mowing device 10 cuts the grass while making the mowing heights on the left and right sides the same or substantially the same. At this time, the second rotary transmission shaft 96 swings up and down with the universal joint portion 98 on the side of the relay transmission case as a swing fulcrum, and expands and contracts due to the spline engagement between the universal joint portion 98 and the rotary shaft, thereby transmitting the second rotary transmission. The shaft 96 does not interfere with rolling of the mowing device 10 .

By keeping the rolling lock mechanism 80 in the locked state, the mower 10 can be prevented from rocking when the mower is moved by itself or transported by a truck.

When inspecting or repairing the grass cutting device 10, the relay frame 30 can be removed from the support frame 20 and the grass cutting device 10 can be removed by switching the left and right lower engaging/disengaging portions 50 and the upper engaging/disengaging portions 60 to the disconnected state. can.

[Another embodiment]
(1) In the above-described embodiment, remote control is enabled by a radio control device, but the present invention is not limited to this. For example, it may be a so-called riding type in which a worker rides.

(2) In the above-described embodiment, the grass cutting device 10 is positioned in front of the traveling machine body 2, but may be positioned behind the traveling machine body 2.

(3) In the above-described embodiment, an example in which the mowing device 10 is provided has been shown, but the present invention is not limited to this. For example, it may be equipped with various ground working devices such as a snow removal device.

(4) In the above-described embodiment, the belt transmission mechanism 97 as the transmission mechanism portion is provided on the left lateral side of the mower 10, but it is provided on the right lateral side of the mower 10. may be Instead of the belt transmission mechanism 97, a rotation transmission shaft may be used.

(5) In the above-described embodiment, the relay transmission case 91 is supported at a portion that is deviated downward from the rolling support portion 70, but the present invention is not limited to this. For example, it may be supported at any site, such as a site laterally deviated from the rolling support 70 .

(6) In the above-described embodiment, an example in which the relay frame as the free end portion 30 is detachably supported by the support frame 20 is shown, but it may be non-detachable.

The present invention is provided over a traveling machine body, a ground working device positioned in front or rear of the traveling machine body, and the traveling machine body and the ground working device, so that the ground working device can be raised and lowered with respect to the traveling machine body. and a connection mechanism that connects the ground work device to the traveling machine body in a state where the ground work device can be rolled with respect to the machine body.

2 traveling machine body 10 ground working device (grass cutting device)
10a Input shaft (device input shaft)
20 Support frame 24 Lifting cylinder 40 Connection frame 70 Rolling support 90 Output shaft 91 Relay transmission case 94 First rotation transmission shaft 95 Universal joint 96 Second rotation transmission shaft 97 Transmission mechanism (belt transmission)
97c Endless rotation belt 98 Universal joint K Coupling mechanism M Power transmission mechanism X Rolling axis

Claims (5)

a running body,
A ground working device positioned in front or behind the traveling machine body;
The ground working device is provided over the traveling machine body and the ground working device, and is in a state in which the ground working device can be moved up and down with respect to the traveling machine body and in a state in which the ground working device can roll with respect to the traveling machine body. A connection mechanism that connects the to the traveling body,
a power transmission mechanism that transmits power from the traveling machine body to the ground work device,
The connecting mechanism is
A support frame extending from the traveling machine body toward the ground work device so as to be capable of swinging up and down, a connection frame portion provided in the ground work device, a free end portion of the support frame, and the connection frame portion. , the connecting frame portion has a rolling support portion that is supported in a swingable state with the rolling axis as a swinging fulcrum, and an elevating cylinder that swings the support frame with respect to the traveling machine body. ,
The power transmission mechanism is
A relay transmission case supported at a portion of the free end portion separated from the rolling support portion, and a state along the machine body longitudinal direction from the output shaft provided on the traveling machine body toward the relay transmission case. A first rotary transmission shaft that is extended and inputs the power of the output shaft to the relay transmission case, and a second rotary transmission shaft that is extended laterally outward from the relay transmission case and transmits the output of the relay transmission case. and a transmission shaft extending along the longitudinal direction of the machine body from an extended end portion of the second rotary transmission shaft toward the input shaft of the ground working device at a lateral side of the ground working device, a transmission mechanism for transmitting power of the transmission shaft to the input shaft;
Universal joint portions are provided at an end of the first rotary transmission shaft on the output shaft side and an end of the first rotary transmission shaft on the relay transmission case side,
A working machine, wherein a universal joint portion is provided at an end portion of the second rotary transmission shaft on the side of the relay transmission case and an end portion of the second rotary transmission shaft on the side of the transmission mechanism portion. 2. The working machine according to claim 1, wherein the relay transmission case is supported at a portion of the free end portion that is deviated downward from the rolling support portion. The working machine according to claim 1 or 2, wherein the transmission mechanism portion is a belt transmission mechanism that transmits power of the second rotary transmission shaft to the input shaft by an endless rotating belt. The work machine according to any one of claims 1 to 3, wherein the free end portion is configured to be detachable from the support frame. The working machine according to any one of claims 1 to 4, wherein the ground working device is a mowing device.

Images