JP6849437B2 - Work vehicle - Google Patents

Description

The present invention relates to a working vehicle such as a tractor and a passenger rice transplanter, and more particularly to a connecting mechanism between a traveling machine and a working machine.

In general, for work vehicles such as tractors and passenger rice transplanters, the work machine is connected to the rear of the traveling machine supported by wheels, crawlers, etc., and while traveling in the field, the work machine is used for work such as tilling and transplanting seedlings. Do. Conventionally, as shown in Patent Document 1, the passenger rice transplanter main body and the planting work machine can be freely engaged and detached via the machine-side connection portion of the passenger rice transplanter main body and the work machine side connection portion of the planting work machine. A passenger rice transplanter connected to is known. This passenger rice transplanter is provided with a groove-shaped upper locking portion having an upper opening and a U-shaped rotatable engaging body at the connecting portion on the machine side, and is formed in a pin shape on the connecting portion on the working machine side. The upper locking receiver and the lower locking receiver are provided, and the upper locking receiver is attached to the upper locking portion and the lower locking receiver is attached to the engaging body so as to be detachably engaged with each other. As a result, by exchanging the planting work machine for the main body of the passenger rice transplanter, it is possible to respond to changes in the work content such as changing the number of planting rows, and maintenance and management in consideration of aging etc. , It can be done separately for the passenger rice transplanter body and the planting work machine.

Japanese Patent No. 2846648

However, the passenger rice transplanter described in Patent Document 1 is required to have high dimensional accuracy in the connecting portion on the machine side and the connecting portion on the working machine side, so that there is a risk that the cost will increase. In addition, the connection portion on the machine side has a relatively large number of parts and has a complicated structure.

Therefore, an object of the present invention is to provide a work vehicle having a simple structure and capable of mounting a work machine without looseness even with relatively low dimensional accuracy.

The present invention comprises a traveling machine body (5) supported by a traveling device (2, 3) and a link mechanism (6) provided at the rear of the traveling machine body (5) to raise and lower the working machine (8). In the work vehicle (1) to be prepared
A base member (20) provided at the rear end of the link mechanism (6) and
The receiving portions (21a, 22a) fixed to the base member (20), the upper side is open, and the mounting shaft portions (33, 34) of the working machine (8) are supported.
A lock member (25) that is supported by the base member (20) with a predetermined amount of play and that restricts the mounting shaft portions (33, 34) from being separated from the receiving portions (21a, 22a).
A pressing member (29) that presses the lock member (25) downward is provided.
Wherein is pressed toward the locking member (25) said mounting shaft portion into the receiving portion (21a) by the pressing member (29),
The lock member (25) faces the upper regulation surface (25a) and the upper regulation surface (25a) capable of restricting the upward movement of the mounting shaft portion (33) engaged with the receiving portion (21a). Has a lower regulatory surface (25b)
It is characterized by that.
Further, the present invention includes a traveling machine body (5) supported by a traveling device (2, 3) and a link mechanism (6) provided at a rear portion of the traveling machine body (5) to raise and lower the working machine (8). In the work vehicle (1) equipped with,
A base member (20) provided at the rear end of the link mechanism (6) and
Receiving portions (21a, 22a) fixed to the base member (20), open upward, and supporting the mounting shaft portions (33, 34) of the working machine (8)
A lock member (25) that is supported by the base member (20) with a predetermined amount of play and that restricts the mounting shaft portions (33, 34) from being separated from the receiving portions (21a, 22a).
A pressing member (29) that presses the lock member (25) downward is provided.
The locking member (25) is pressing the mounting shaft portion toward the receiving portion (21a) by the pressing member (29).
The base member (20) is formed with a hole (20e) for guiding the support shaft (23) erected on the lock member (25) with play.
The pressing member (29) is provided so as to be movable in the front-rear direction and has an inclined surface (29d) that presses the support shaft (23) downward by moving backward.
It is characterized by that.

For example, with reference to FIGS. 2 and 6, the lock member (25) has an upper regulation surface (25a) capable of restricting the upward movement of the mounting shaft portion (33) engaged with the receiving portion (21a). ) And the lower regulation surface (25b) facing the upper regulation surface.

For example, with reference to FIGS. 2, 3, 4 and 6, the base member (20) has at least two receiving portions (21a, 22a) arranged apart from each other in the vertical direction. The lock member (25) that presses the mounting shaft portion toward one receiving portion (21a) is arranged.

For example, with reference to FIGS. 2 and 6, the base member (20) is formed with a hole (20e) for guiding the support shaft (23) erected on the lock member (25) with play. ,
The pressing member (29) is provided so as to be movable in the front-rear direction and has an inclined surface (29d) that presses the support shaft (23) downward by moving backward.

The reference numerals in parentheses are for comparison with the drawings, but do not limit the configuration of the present invention.

According to the first aspect of the present invention, since the lock member presses the mounting shaft portion downward toward the receiving portion by the pressing member, the work is performed regardless of the dimensional accuracy of the lock member, the receiving portion and the mounting shaft portion. The play when attaching the machine to the link mechanism can be reduced and the machine can be mounted without looseness, and the accuracy of the mounting position of the work machine with respect to the traveling machine can be improved. In addition, since it is composed of a relatively small number of parts, it is possible to save the trouble of maintenance with a simple configuration.

According to the second aspect of the present invention, the weight of the work machine received from the mounting shaft portion can be supported by the lower regulation surface of the lock member and the receiving portion, so that the strength can be improved.

According to the third aspect of the present invention, the base member is provided with a lock member that presses the mounting shaft portion toward one of the receiving portions provided at intervals in the vertical direction. Therefore, it is possible to reduce the play when attaching the work machine to the link mechanism with a small number of parts.

According to the fourth aspect of the present invention, since the pressing member has an inclined surface that downwardly presses the support shaft erected on the lock member by moving backward, the work machine can be linked by a simple operation. It is possible to reduce the play when attaching to the mechanism.

The side view which shows the passenger rice transplanter which concerns on this embodiment. The side view which shows the airframe connection part. The front view which shows the airframe connection part. The rear view which shows the airframe connection part. A cross-sectional view taken along the line AA of FIG. 2 showing an airframe connection portion. The side view which shows the open state of a lock plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the passenger rice transplanter 1 as a work vehicle according to the present embodiment has a traveling machine body 5 supported by front wheels 2 and rear wheels 3 as a pair of left and right traveling devices, and the traveling machine body 5 The planting work machine 8 is supported so as to be able to move up and down by an elevating link mechanism 6 provided at the rear portion. The elevating link mechanism 6 has a lift cylinder 9 that is hydraulically operated, and the planting work machine 8 is elevated according to the expansion / contraction operation of the lift cylinder 9.

The planting work machine 8 includes a seedling stand 10 on which mat seedlings (not shown) are placed, a planting mechanism 11 that scrapes seedlings from the mat seedlings and transplants them to the field, a float 12 that slides in the field scene, and the like. .. The planting mechanism 11 detects unevenness and hardness of the field scene by following the field scene of the float 12 as the traveling machine body 5 travels, and adjusts the vertical height so as to obtain an appropriate planting depth.

At the center of the traveling machine 5, an operating unit 14 on which an operator is boarded to operate the traveling machine 5 and the planting work machine 8 is arranged. A driver's seat 15 is arranged in the driver's seat 14, and in front of the driver's seat 15, a steering handle 16 for steering the traveling machine 5 and a working machine operating tool (not shown) for raising and lowering the planting work machine 8 are operated. Etc. are arranged. In the present embodiment, the front direction facing the operator seated in the driver's seat 15 of the passenger rice transplanter 1 placed on the horizontal plane is set as the front direction, and the front-back and left-right directions are defined based on this. An engine and a transmission (not shown) are mounted on the front portion of the traveling machine body 5. The power output by the engine is changed by the transmission and transmitted to the front wheels 2 and the rear wheels 3, and is also transmitted to the lift cylinder 9 and the planting work machine 8 via a hydraulic control mechanism (not shown).

As shown in FIGS. 2 to 5, the elevating link mechanism 6 includes a link base 13 fixed to the rear portion of the traveling machine body 5, a top link 6a extending substantially rearward from the link base 13, and a top link 6a. A lower link 6b that is arranged downward and extends substantially rearward from the link base 13, and an airframe connecting portion that is provided at the rear ends of the top link 6a and the lower link 6b and to which the planting work machine 8 can be detachably attached. 17 and. The link base 13 pivotally supports the front end portions of the top link 6a and the lower link 6b so that the top link 6a and the lower link 6b can swing substantially in the vertical direction.

The airframe connecting portion 17 includes a top link shaft 6c and a lower link shaft 6d that pivotally support the rear ends of the top link 6a and the lower link 6b so that the top link 6a and the lower link 6b can swing substantially in the vertical direction. A link holder 20 as a base member for fixing the top link shaft 6c and the lower link shaft 6d is provided, and a parallel link mechanism is formed by the link base 13, the top link 6a, the lower link 6b, and the link holder 20. There is. Further, the link base 13 pivotally supports the front end of the lift cylinder 9 so that the lift cylinder 9 can swing, and the lower link 6b of the lift cylinder 9 allows the lift cylinder 9 to swing. The rear end is pivotally supported, and when the lift cylinder 9 contracts, the lower link 6b tilts substantially upward and the link holder 20 rises, and when the lift cylinder 9 extends, the lower link 6b tilts substantially downward and the link. The holder 20 is lowered.

The link holder 20 includes a left plate 20a and a right plate 20b that penetrate and support both the top link shaft 6c and the lower link shaft 6d, and a front plate 20c and a rear plate 20d that connect the left plate 20a and the right plate 20b. Is formed into a tubular shape having a square cross section in a plan view. The upper fixing plate 22 and the lower fixing plate 21 arranged below the rear plate 20d at a predetermined distance downward from the upper fixing plate 22 are fixed to the rear plate 20d. The upper fixing plate 22 and the lower fixing plate 21 have an upper engaging groove 22a and a lower engaging groove 22a as receiving portions formed in a U shape in a side view from the right plate 20b to the left plate 20a with their upper portions open. It has an engaging groove 21a.

Further, on the left and right sides of the link holder 20, lock plates 25 as a pair of lock members formed in a flat plate shape are arranged, and the lock plates 25 serve as support shafts extending in the left-right direction. It is rotatably supported with respect to the link holder 20 around the fulcrum shaft 23. The fulcrum shaft 23 connects each lock plate 25 so as to be erected from the lock plate 25 on one side toward the lock plate 25 on the other side, and a lock guide hole formed in the link holder 20. It is loosely fitted in 20e. The lock guide hole 20e is formed in an elongated hole having a major axis in the vertical direction and a minor axis having a length slightly larger than the diameter of the fulcrum shaft 23 in the horizontal direction, and guides the fulcrum shaft 23 in the vertical direction to guide the lock plate. 25 can move a predetermined amount in the vertical direction.

The lock plate 25 has a stopper portion (not shown) that contacts the link holder 20 at a predetermined position when the lock plate 25 tilts in the direction B shown in FIG. 2, and a side view located below the fulcrum shaft 23. A U-shaped hook portion 25e is formed. The hook portion 25e has an upper regulation surface 25a, a lower regulation surface 25b facing the upper regulation surface 25a, and a connection surface 25d connecting the upper regulation surface 25a and the lower regulation surface 25b, and the rear side is opened. A guide surface 25c is formed so as to stand upward from the rear end of the upper regulation surface 25a. At the rotational position of the lock plate 25 in FIG. 2 where the upper regulation surface 25a faces the bottom surface of the lower engagement groove 21a, the upper regulation surface is in contact with the bottommost portion of the lock guide hole 20e. The distance between the 25a and the bottommost portion of the lower engaging groove 21a is set to be smaller than the diameter of the lower shaft 33 as the mounting shaft portion of the working machine connecting portion 19, which will be described later.

The lock plate 25 is urged in the direction B by a lock plate spring 26 having one end connected to the left lock plate 25 and the other end connected to the link holder 20, and is planted in the elevating link mechanism 6. When the machine 8 is not attached, the stopper portion presses the link holder 20 by the urging force of the lock plate spring 26. A plate-shaped lock lever 27 extending forward from the fulcrum shaft 23 is fixed to the lock plate 25 on the right side. A lock pin 28 is extended in the left-right direction of the lock lever 27, and the lock plate 25 is in contact with the link holder 20 at the stopper portion, and is opposed to the urging force of the lock plate spring 26 in the opposite direction to the direction B. When tilted by a predetermined angle in the direction, the lock pin 28 comes into contact with the front surface of the front plate, and further tilting of the lock plate 25 in the direction opposite to the direction B is restricted.

The link holder has a cylindrical front slide guide shaft 36 extending so as to penetrate the link holder 20 in the left-right direction, and a front slide guide shaft 36 arranged behind the front slide guide shaft 36 and parallel to the front slide guide shaft 36. Moreover, the rear slide guide shaft 37 having substantially the same diameter is fixed. A pair of plates extending in the front-rear direction in the machine body connecting portion 17 between the left plate 20a and the left lock plate 25 and between the right plate 20b and the right lock plate 25, respectively. A slide member 29 is provided as a pressing member having a shaped slide plate 29a. The left and right slide plates 29a are connected to each other by a connecting shaft 29e arranged at the front end of the slide plate 29a. The slide plate 29a is formed with a slide guide 29b which is an elongated hole having a major axis in the front-rear direction and a minor diameter slightly larger than the diameters of the front slide guide shaft 36 and the rear slide guide shaft 37 in the vertical direction. .. The slide guide 29b is guided in the front-rear direction by the front slide guide shaft 36 and the rear slide guide shaft 37 by loosely fitting the front slide guide shaft 36 and the rear slide guide shaft 37, and the slide member 29 is guided in the front-rear direction by a predetermined amount in the front-rear direction. It is possible to move.

One end of the slide member 29 is connected to the front end portion of the slide member 29, and the other end is urged rearward by the urging force of the slide spring 31 connected to the rear slide guide shaft 37. A slide grip 29c is provided at the center of the connecting shaft 29e in the left-right direction for the operator to grip and operate the slide member 29 forward against the urging force of the slide spring 31. An inclined surface 29d that gradually moves upward as it approaches the rear end is formed at the lower rear end portion of each of the left and right slide plates 29a, and when the slide member 29 is not operated by an operator, the inclined surface 29d is formed. 29d comes into contact with the fulcrum shaft 23, and the slide member 29 presses the fulcrum shaft 23 downward by the urging force of the slide spring 31.

A holder 32 that supports the upper shaft 34 and the lower shaft 33 as the mounting shaft portion is fixed to the working machine connecting portion 19 provided at the front portion of the planting working machine 8. Both the upper shaft 34 and the lower shaft 35 are formed in a columnar shape extending in the left-right direction, and the separation distance between the upper regulation surface 25a and the lower regulation surface 25b is slightly larger than the diameter of the lower shaft 35. In the state where the planting work machine 8 is attached to the elevating link mechanism 6, the upper shaft 34 is engaged with the upper engaging groove 22a, and the lower shaft 35 is engaged with the lower engaging groove 21a.

When the planting work machine 8 mounted on the ground or the like is attached to the elevating link mechanism 6, the worker first lowers the work machine operating tool so that the machine body connecting portion 17 approaches the ground or the like. Next, the traveling machine 5 is moved so that the machine connecting portion 17 faces the working machine connecting portion 19, and the traveling machine 5 is slowly moved backward and brought closer to the planting work machine 8. With the machine connecting part 17 and the working machine connecting part 19 sufficiently close to each other, the operator adjusts the height of the machine connecting part 17 so that the lower engaging groove 21a is located at a position slightly lower than the lower shaft 33. Adjust and move the traveling machine body 5 backward to a front-rear position where the lower shaft 33 can be engaged with the lower engaging groove 21a and the upper shaft 34 can be engaged with the upper engaging groove 22a. At this time, the lower shaft 33 pushes the guide surface 25c forward while resisting the urging force of the lock plate spring 26, and tilts the lock plate 25 in the direction opposite to the direction B. In this state, the operator raises the machine body connecting portion 17 to a height at which the lower shaft 33 engages with the lower engaging groove 21a and the upper shaft 34 engages with the upper engaging groove 22a.

Next, the operator operates the lock lever 27 while pulling the slide grip 29c forward against the urging force of the slide spring 31 to adjust the vertical position and the rotation position of the lock plate 25, and lowers the upper regulation surface 25a. The hook portion 25e is engaged with the lower shaft 33 so that the lower shaft 33 is positioned between the regulating surface 25b, and the hand is released from the slide grip 29c. By doing so, the inclined surface 29d presses the fulcrum shaft 23 downward by the slide spring 31, and the upper regulation surface 25a presses the lower shaft 33 downward toward the lower engaging groove 21a, and the lower shaft 33. Is restricted from moving upward and detaching from the lower engaging groove 21a, and the upper shaft 34 presses the upper engaging groove 22a downward or the lower shaft 33 presses the lower engaging groove 21a downward to perform the work. The machine connecting portion 19 is fixed to the machine connecting portion 17, and the planting work machine 8 is attached to the elevating link mechanism 6.

When removing the planting work machine 8 from the elevating link mechanism 6, the operator first lowers the work machine operating tool to a height at which the planting work machine 8 touches the ground, and moves the lock lever 27 in the opposite direction to the direction B. Tilt in the direction. At this time, since the fulcrum shaft 23 is pressed downward by the urging force of the slide spring 31, the state in which the upper regulation surface 25a is separated from the lower shaft 33 is maintained even if the operator releases the lock lever 27. .. Next, the operator lowers the machine body connecting portion 17, confirms that the lower shaft 33 and the lower engaging groove 21a and the upper shaft 34 and the upper engaging groove 22a are disengaged, and then the traveling machine body 5 Is moved forward to separate the working machine connecting portion 19 from the machine connecting portion 17, and the planting working machine 8 is removed from the elevating link mechanism 6.

With the above configuration, according to the present embodiment, the slide member 29 presses the lock plate 25 downward via the fulcrum shaft 23, and the lock plate 25 presses the lower shaft 33 downward toward the lower engaging groove 21a. Therefore, regardless of the dimensional accuracy of the lock plate 25, the lower engaging groove 21a, and the lower shaft 33, the play when attaching the planting work machine 8 to the elevating link mechanism 6 can be reduced and the planting work machine 8 can be attached without looseness. .. Further, for example, by intentionally setting the distance between the lower engaging groove 21a and the upper engaging groove 22a to be smaller than the lower limit of the variation range of the distance between the lower shaft 33 and the upper shaft 34, the elevating link mechanism 6 is provided. Since the position of the planting work machine 8 is determined by the position of the lower shaft 33 with respect to the planting work machine 8, it is not necessary to require high accuracy for the position of the upper shaft 34 with respect to the planting work machine 8, and it is easy to refer to the traveling machine body 5. The accuracy of the mounting position of the planting work machine 8 can be improved. Further, since the machine body connecting portion 17 is composed of a relatively small number of parts, it is possible to save the trouble of maintenance with a simple configuration.

When the planting work machine 8 is attached to the elevating link mechanism 6 and the fulcrum shaft 23 is in contact with the lower end of the lock guide hole 20e, only the upper engaging groove 22a and the lower engaging groove 21a are used. However, since the weight of the planting work machine 8 received from the lower shaft 33 can be supported by the lower regulation surface 25b, the strength of the machine body connecting portion 17 can be improved. The lock plate 25 is not provided for the upper engaging groove 22a, but is provided only for the lower engaging groove 21a and presses the lower shaft 33 toward the lower engaging groove 21a, so that there are few parts. The number of points can reduce the play when attaching the planting work machine 8 to the elevating link mechanism 6. The slide member 29 has an inclined surface 29d that presses the lock plate 25 downward via the fulcrum shaft 23 by being urged rearward and releases the pressing by being moved forward. It is possible to reduce the play when attaching the planting work machine 8 to the elevating link mechanism 6 by a simple operation by a person. Further, the lock lever 27 and the slide member 29 are provided between the top link shaft 6c and the lower link shaft 6d in the vertical direction, so that the device does not become large and there is a low possibility that the device will interfere with the planting work or the like.

Although the lock plate 25 is provided for the lower engaging groove 21a, it is not provided for the lower engaging groove 21a and is provided only for the upper engaging groove 22a to provide the upper shaft 34. It may be configured to press downward toward the upper engaging groove 22a. The upper engaging groove 22a and the lower engaging groove 21a do not have to be U-shaped, and may be U-shaped with the upper side open or V-shaped with the upper side open. Further, both the upper engaging groove 22a and the lower engaging groove 21a do not have to be U-shaped or the like, and either one of the upper engaging groove 22a and the lower engaging groove 21a is the upper shaft 34 or the lower shaft 33. A shape that regulates only the movement of the upper shaft 34 in the front-rear direction and does not support the lower portion, for example, has a front wall and a rear wall that regulate the movement of the upper shaft 34 or the lower shaft 33 in the front-rear direction, and the upper and lower sides are open. It may be in shape. The traveling device may be a crawler or a combination of wheels and crawlers. Although the above embodiment has described the passenger rice transplanter 1 provided with the planting work machine 8, the working machine may be a cultivator, a substitute scraper, or the like, and the traveling machine 5 may be a tractor or the like.

1 Work vehicle (passenger rice transplanter)
2 Traveling device (front wheel)
3 Traveling device (rear wheel)
5 Traveling machine 6 Link mechanism (elevating link mechanism)
8 Work machine (planting work machine)
20 Base member (link holder)
20e hole (lock guide hole)
21a receiving part (lower engaging groove)
22a receiving part (upper engaging groove)
23 Support shaft (fulcrum shaft)
25 Lock member (lock plate)
25a Upper regulation surface 25b Lower regulation surface 29 Pressing member (slide member)
29d Inclined surface 33 Mounting shaft (lower shaft)
34 Mounting shaft (upper shaft)

Claims (2)

In a work vehicle provided with a traveling machine supported by a traveling device and a link mechanism provided at the rear of the traveling device to raise and lower the working machine.
A base member provided at the rear end of the link mechanism and
A receiving portion that is fixed to the base member, has an open upper portion, and supports a mounting shaft portion of the working machine.
A lock member that is supported by the base member with a predetermined amount of play and that restricts the mounting shaft portion from being separated from the receiving portion.
A pressing member that presses the lock member downward is provided.
Wherein the locking member by the pressing member is pressed toward the mounting shaft portion into the receiving portion,
The lock member has an upper regulation surface capable of restricting the upward movement of the mounting shaft portion engaged with the receiving portion and a lower regulation surface facing the upper regulation surface.
A work vehicle characterized by that. In a work vehicle provided with a traveling machine supported by a traveling device and a link mechanism provided at the rear of the traveling device to raise and lower the working machine.
A base member provided at the rear end of the link mechanism and
A receiving portion that is fixed to the base member, has an open upper portion, and supports a mounting shaft portion of the working machine.
A lock member that is supported by the base member with a predetermined amount of play and that restricts the mounting shaft portion from being separated from the receiving portion.
A pressing member that presses the lock member downward is provided.
The locking member presses the mounting shaft portion toward the receiving portion by the pressing member.
The base member is formed with a hole for guiding the support shaft erected on the lock member with play.
The pressing member is provided so as to be movable in the front-rear direction and has an inclined surface that presses the support shaft downward by moving backward.
A work vehicle characterized by that.

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