JP2017201965A - Tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform simply and quickly holding and holding release of a top link, while holding the top link tight so as not to perform head-feeding easily.SOLUTION: A link holding mechanism 15 includes an engaging part 16 provided on a top link 9, a catcher part 20 for holding the top link 9 by holding the engaging part 16. The catcher part 20 includes a hook part 24 capable of oscillating over an action position engaged with a reception part 22 and a release position where engagement with the reception part 22 is released, and holds the engaging part 16 by the reception part 22 and the hook part 24 positioned on the action position.SELECTED DRAWING: Figure 2

Description

  The present invention has a top link extending rearward from the vehicle body and a lower link extending rearward from the vehicle body, and the work device can be moved up and down to the vehicle body by the top link and the lower link. The present invention relates to a tractor having a link mechanism to be connected.

  In the above-described tractor, conventionally, as shown in Patent Document 1, for example, there has been a tractor capable of holding a top link from which a working device is removed. That is, the top link is fitted to an elastic fixture formed by bending an elastic rod into a U shape and the holding portion is formed, or the handle as a hook member supported by the top link is hooked on the engagement link was there.

No. 6-33763

  If an elastic fixture is used, reducing the possibility that the held top link will be disengaged (such as self-removal) due to running vibration, etc., it is necessary to increase the elastic restoring force of the elastic fixture, so the top link is elastic. The operation of holding the fixture and the operation of removing the top link from the elastic holder become heavy.

  When the hook member and the engagement link are adopted, if the possibility that the top link in the holding state is detached is lowered, it is necessary to deepen the hooking depth of the hook member to the engagement link. It takes time and effort to remove the hook member from the engagement link. That is, it takes time to release the holding of the top link.

  The present invention provides a tractor that can hold and release a top link lightly and quickly while holding the top link so that it is difficult to remove itself.

The tractor according to the present invention is
A link mechanism having a top link extending rearward from the vehicle body and a lower link extending rearward from the vehicle body, and connecting the work device to the vehicle body by the top link and the lower link so as to be lifted and lowered. When,
A link holding mechanism for holding the top link, and the link holding mechanism,
An engaging portion provided on the top link;
A catcher portion that is provided on the vehicle body side and holds the top link by holding the engagement portion;
The catcher part is
A receiving portion that receives the engaging portion, and a hook portion that is swingable between an operating position engaged with the receiving portion and a release position where the engagement with the receiving portion is released, The engaging portion is held by the receiving portion and the hook portion at the operating position.

  According to this configuration, the hook portion is swung from a working position to a release position by swinging the hook portion by a slight stroke that only opens the entrance / exit passage of the engaging portion with respect to the receiving portion, and the engaging portion is moved to the catcher. The top link can be held by being attached to the portion, or the top link can be released by removing the engaging portion from the catcher portion. When the engaging part is mounted on the catcher part, the engaging part is held by the receiving part and the hook part engaged with the receiving part. Even if the vibration of the top link is transmitted to the engaging portion, the hook portion is hardly swung by the engaging portion, so that the engaging portion can be firmly held by the catcher portion.

  Therefore, while the top link can be firmly held so as not to be easily detached by vibration or the like, the top link can be held lightly and quickly and the top link can be released simply by slightly operating the hook portion. It is easy to hold and release the top link with one hand.

In order to make the present invention more suitable, the following configuration is provided.
The receiving portion is configured to receive the engaging portion from below, and is provided on the rear side of the catcher portion, and guides the receiving portion while placing and supporting the engaging portion so as to be slidable back and forth. It has a configuration in which a guide portion is provided.

  According to this configuration, if the engaging portion is placed on the guide portion and the top link is swung toward the catcher portion, the engaging portion receives the moving operation by the top link and slides the guide portion. Since the guide portion is guided to reach the receiving portion, the engagement portion can be easily attached to the catcher portion without any special effort to align the engagement portion with the catcher portion.

In order to make the present invention more suitable, the following configuration is provided.
The other of the guide part and the engaging part in a state in which the vertically projecting part provided on one of the guide part and the engaging part is engaged with the vertically projecting part so as to be relatively movable in the front-rear direction. And when the engaging portion slides the guide portion rearward and is positioned at the rear end portion of the guide portion, the vertically projecting portion is in the front-rear direction of the hole portion. The engagement portion is suspended and supported by the guide portion via the vertical protrusion.

  According to this configuration, even if the engaging portion is pulled out of the catcher portion due to the weight of the top link and moved backward, the engaging portion is directed upward and downward when the engaging portion is positioned at the rear end portion of the guide portion. Since the guide part is suspended and supported via the protrusion, the top link may be suspended and supported by the guide part via the engagement part even if the engagement part is released from the catcher part. Absent. Therefore, even when the holding release of the top link is performed with one hand, the releasing operation can be appropriately performed.

In order to make the present invention more suitable, the following configuration is provided.
The vertically projecting portion protrudes downward from the front end portion of the engaging portion, and the hole portion is provided in the guide portion.

  According to this configuration, when the engaging portion is placed on the guide portion, the vertically projecting portion enters the hole portion before the engaging portion is placed on the guide portion. It is hard to become an obstacle to the operation to be placed on.

In order to make the present invention more suitable, the following configuration is provided.
The guide portion is configured to extend rearward from the receiving portion.

  According to this structure, a guide part can be supported by the simple support structure which utilized the receiving part for the support part of a guide part.

In order to make the present invention more suitable, the following configuration is provided.
An urging member that urges the hook portion to the working position is provided, and is provided by the engagement portion that is provided across the hook portion and the engagement portion and is pushed toward the receiving portion. And a cam mechanism that swings the hook portion to the release position against the biasing member by an operating force.

  According to this configuration, the hook portion is urged to the operating position by the urging member and is not easily switched to the release position due to vibration or the like, so that the engaging portion can be more firmly held by the receiving portion and the hook portion. However, if the hook part is pushed toward the receiving part, the hook part is operated to the release position by the cam mechanism, so that the engagement part can be easily moved without performing a special operation for switching the hook part to the release position. Can be attached to the catcher section.

In order to make the present invention more suitable, the following configuration is provided.
The hook portion is configured to be swingably supported by the receiving portion.

  According to this configuration, the hook portion can be supported with a simple support structure in which the receiving portion is used as the support portion of the hook portion.

It is a left view which shows the whole tractor. It is a left view which shows the link holding mechanism of a top link holding state. It is a top view which shows the link holding mechanism of a top link holding state. It is a vertical side view which shows the link holding mechanism in the state by which the top link was suspended and supported. It is a left view which shows the action state of a cam mechanism. It is a vertical side view which shows the link holding mechanism of a top link holding state. It is a front view which shows an engaging part. It is a left view which shows the engagement part detachment prevention structure provided with another implementation structure.

Hereinafter, embodiments of a tractor according to the present invention will be described based on the drawings.
As shown in FIG. 1, the tractor has a vehicle body frame constituted by an engine 1 and a transmission case 2 connected to the rear portion of the engine 1, and a pair of left and right front wheels 3 can be driven and steered. The vehicle body is equipped with a pair of left and right rear wheels 4 drivable. A boarding type driving unit 5 is formed at the rear of the vehicle body. The driving unit 5 is provided with a cabin 6 that covers the boarding space. At the rear of the vehicle body, there are provided a link mechanism 7 for connecting various working devices such as a rotary tiller so as to be movable up and down, and a power take-off shaft 8 for transmitting a driving force from the engine 1 to the connected working devices.

  As shown in FIG. 1, the link mechanism 7 includes a top link 9 extending from the mission case 2 so as to be swingable up and down, and a pair of left and right members extending from the mission case 2 so as to be swingable up and down. A lower link 10. The left and right lower links 10 are connected via a lift rod 12 to a pair of left and right lift arms 11 supported by the mission case 2 so as to be capable of swinging up and down. The lifting operation of the left and right lift arms 11 is performed by extending and contracting a hydraulic cylinder (not shown) provided inside the mission case 2.

  By connecting the free end portion of the top link 9 and the free end portions of the left and right lower links 10 to the connection portion of the work device, the work device can be connected to the vehicle body so as to be movable up and down. By lifting and lowering the left and right lift arms 11, the left and right lower links 10 are lifted and lowered by the lift arms 11 so that the entire link mechanism 7 can be swung, and the working device can be lifted and lowered.

  The top link 9 has a first posture (working posture) for connecting a working device indicated by a two-dot chain line in FIG. 1 and a solid line in FIG. As shown in FIG. 2, the rocker moves up and swings from the first posture and swings over a second posture (storage posture) closer to the vehicle body than the first posture. The top link 9 can be held in the second posture by a link holding mechanism 15 provided across the vehicle body side and the top link 9.

  As shown in FIGS. 2 and 3, the link holding mechanism 15 includes an engaging portion 16 provided on the top link 9, a catcher portion 20 provided on the vehicle body side, and a guide provided on the rear side of the catcher portion 20. Part 30.

  As shown in FIG. 3, the engaging portion 16 is configured by a round bar formed in a loop shape having a drum shape in plan view, and the bottom portion 17 a is relatively rotatable at a midway portion in the longitudinal direction of the top link 9. A base end side portion 17 having a triangular shape in a plan view supported by the head portion and a front end side portion 18 having a triangular shape opposite to the base end side portion 17 in a plan view. The engaging portion 16 extends from the top link 9 in a forward direction so as to be swingable with the shaft center of the bottom portion 17a as a swing fulcrum X. The engaging portion 16 can be configured by members having different specific shapes such as a rectangle, a circle, and an ellipse in a plan view.

  As shown in FIGS. 2 and 3, the catcher portion 20 includes a receiving portion 22 formed at the rear end portion of the support member 21 facing the vehicle body and a hook supported by the receiving portion 22 via a connecting pin 23. A portion 24 and a spring 25 connected to the hook portion 24 are provided.

  The support member 21 extends rearward from the support frame 13 supported in the vehicle body lateral posture at the rear portion of the vehicle body frame, and the receiving portion 22 is provided in a fixed state on the vehicle body side. The support frame 13 is configured to support the rear portion of the cabin 6. As shown in FIGS. 2 and 4, the receiving portion 22 includes a pair of left and right receiving claw portions 22a, and the front end portion 18a of the engaging portion 16 in a state where the top link 9 is positioned in the second posture is received on the left and right sides. It is received and supported from below by the pawl portion 22a.

  As shown in FIGS. 2, 3, and 4, the hook portion 24 includes a pair of left and right hook claw portions 24a provided at the rear end portion of the hook portion 24 and a pair of left and right hook claws 24a provided on the front side of the left and right hook claw portions 24a. Mounting arm portion 24b, and a spring hook portion 24c connected to the distal end side of the left and right mounting arm portions 24b. The left and right attachment arm portions 24 b are connected to the left and right vertical side portions 22 b of the receiving portion 22 via a connecting pin 23 so as to be relatively rotatable. The hook portion 24 is supported by the receiving portion 22 via the connecting pin 23, and can be swung up and down between the lowering action position and the lifting release position with the vehicle body lateral axis of the connecting pin 23 as the swing fulcrum Y. It has become.

  When the hook portion 24 is lowered to the lowering action position, the hook portion 24 engages with the receiving portion 22 from above, and closes the entrance / exit passage through which the front end portion 18 a of the engaging portion 16 enters and exits the receiving portion 22. More specifically, the entrance / exit passage of the front end portion 18a with respect to the left receiving claw portion 22a is closed by the left hook claw portion 24a, and the entrance / exit passage of the front end portion 18a with respect to the right receiving claw portion 22a is closed by the right hook claw portion 24a. close up.

  When the hook portion 24 is lifted to the lift release position, the hook portion 24 releases the engagement with the receiving portion 22 and opens the entrance / exit passage of the front end portion 18 a with respect to the receiving portion 22. Specifically, the left hook claw portion 24a opens the entrance / exit passage for the left receiving claw portion 22a, and the right hook claw portion 24a opens the entrance / exit passage for the left receiving claw portion 22a.

  The spring 25 is connected across the spring hooking portion 24 c of the hook portion 24 and the spring support portion 21 a included in the support member 21. The hook portion 24 is urged downward to the lowering action position by the elastic restoring force of the spring 25. In the present embodiment, a tension coil type spring 25 is employed to urge the hook portion 24 downward. Instead of the tension coil spring 25, various biasing members having different shapes and materials, such as a torsion coil spring, a leaf spring, a spiral spring, and an elastic rubber, can be employed. Moreover, you may comprise so that the hook part 24 may be urged | biased to a downward action attitude | position with the dead weight of the hook part 24. FIG.

  As shown in FIGS. 2, 3 and 7, the guide portion 30 includes a pair of left and right round bar-shaped guide portion main bodies 30a extending from the left and right receiving claw portions 22a, and left and right guide portion main bodies 30a. And a horizontal connecting collar portion 30b connecting the extended end portions. The guide portion 30 guides the front end portion 18a of the engaging portion 16 to the left and right receiving claw portions 22a while placing and supporting the front end portion 18a by the left and right guide portion main bodies 30a so as to be slidable back and forth.

  A cam mechanism 35 is provided across the hook portion 24 and the engaging portion 16. As shown in FIGS. 2 and 5, the cam mechanism 35 is configured by a rearwardly rising lower end edge 36 as a cam follower of the left and right hook claw portions 24a and a front end portion 18a as a cam of the engaging portion 16. Yes. When the front end portion 18a is pushed toward the left and right receiving claws 22a, the cam mechanism 35 is lifted to the hook portion 24 by the engaging portion 16 by pressing the front end portion 18a against the lower edge 36. A force is applied, and the hook portion 24 is pushed up to the lift release position against the spring 25. When the front end portion 18a passes the lower end edge 36 of the hook claw portion 24a and moves to the front side of the hook claw portion 24a, the cam mechanism 35 returns the hook portion 24 to the lowering action position by the spring 25.

  As shown in FIGS. 4 and 7, a vertically projecting portion 40 projects downward from the front end portion 18 a of the engaging portion 16. In the present embodiment, the vertically projecting portion 40 is constituted by a bent portion provided in a round bar material constituting the engaging portion 16. A vertically projecting portion 40 is formed integrally with the engaging portion 16. The vertically projecting portion 40 may be configured by a plate member, a rod member, or the like attached to the engaging portion 16. The vertically projecting portion 40 engages with the hole portion 31 of the guide portion 30, and moves the hole portion 31 when the engaging portion 16 slides back and forth on the guide portion 30. As shown in FIG. 4, when the front end portion 18 a of the engaging portion 16 slides the guide portion 30 rearward and is positioned at the rear end portion of the guide portion 30, the vertically projecting portion 40 becomes the rear end of the hole portion 31. The vertically projecting portion 40 and the connecting collar portion 30b of the guide portion 30 are in contact with each other, and the engaging portion 16 is suspended and supported by the guide portion 30 via the vertically projecting portion 40.

  When the working device is not connected, the engaging portion 16 is placed and supported on the guide portion 30 so that the vertical protrusion 40 is engaged with the hole portion 31 and the front end portion 18a is placed on the guide portion main body 30a. In this state, the top link 9 is swung to the vehicle body side. The engaging part 16 slides forward on the guide part main body 30 a in the guide part 30 and is guided toward the receiving part 22 by the guide part 30. When the front end portion 18a of the engaging portion 16 reaches the hook claw portion 24a, the top link 9 is further swung to the vehicle body side, and the engaging portion 16 is pushed toward the receiving portion 22. The front end portion 18a of the engaging portion 16 causes the cam mechanism 35 to act to push the hook portion 24 to the lift release position, while receiving guidance from the guide portion 30 and passing under the hook claw portion 24a. When the top link 9 is in the second posture, the front end portion 18a of the engaging portion 16 is positioned on the front side of the hook claw portion 24a, the receiving claw portion 22a receives the front end portion 18a from below, and the hook portion 24 is spring 25. The engaging portion 16 is held by the receiving portion 22 and the hook portion 24, the top link 9 is in the second posture, and the top link 9 is moved to the catcher portion 20. Can be held in the second posture.

  The operation part 26 of the hook part 24 is lifted up against the spring 25 to raise the hook part 24 to the lift release position, and the left and right hook claw parts 24a are connected to the receiving part 22 in the entrance / exit passage of the engaging part 16 Is opened, the top link 9 is swung back and the front end portion 18a of the engaging portion 16 is pulled out from the receiving portion 22 to release the holding of the engaging portion 16 by the catcher portion 20. The holding of the link 9 in the second posture can be released. At this time, when the front end portion 18 a of the engaging portion 16 slides backward on the guide portion 30 and the front end portion 18 a is located at the rear end portion of the guide portion 30, the vertically projecting portion 40 becomes the rear end portion of the guide portion 30. The engaging part 16 is suspended and supported by the guide part 30 via the vertically projecting part 40, and the top link 9 can be prevented from being lowered at a stroke. By pulling up the vertically projecting portion 40 from the hole portion 31 of the guide portion 30, the engaging portion 16 can be removed from the guide portion 30, and the top link 9 can be in the first posture.

[Another embodiment]
(1) FIG. 8 is a left side view showing an engagement portion disengagement prevention structure having another embodiment structure. In this embodiment structure, a vertically projecting portion 41 protrudes upward from the rear end portion of the guide portion 30. The vertically projecting portion 41 moves the hole 42 of the engaging portion 16 back and forth when the engaging portion 16 slides back and forth along the guide portion 30. When the front end portion 18 a of the engaging portion 16 is positioned at the rear end portion of the guide portion 30, the front end portion 18 a comes into contact with and is received by the vertically projecting portion 41, and the engaging portion 16 is guided through the vertically projecting portion 41. It is suspended and supported by the portion 30.

(2) In the above-described embodiment, the hook portion 24 is supported by the receiving portion 22. However, the hook portion 24 is supported by a support member provided on the vehicle body side so as to be swingable up and down separately from the receiving portion 22. A configuration may be adopted.

(3) In the above-described embodiment, an example in which the guide portion 30 is extended from the receiving portion 22 is shown. However, a configuration in which the guide portion 30 is supported by a support member provided on the vehicle body side separately from the receiving portion 22 is adopted. May be.

(4) In the above-described embodiment, the receiving portion 22 is configured to receive the engaging portion 16 from below, and the hook portion 24 swings downward and engages with the receiving portion 22. Contrary to this embodiment, the receiving part 22 is configured to receive the engaging part 16 from the upper side, and the hook part 24 is configured to swing up and engage with the receiving part 22. Also good.

(5) In the above-described embodiment, an example in which the guide portion 30 is provided has been described. However, the guide portion 30 may be omitted.

(6) In the above-described embodiment, the example in which the vertically projecting portions 40 and 41 and the hole portions 31 and 42 are provided may be performed without providing them.

(7) In the above-described embodiment, the example in which the hook portion 24 is urged to the lowering action position by the spring 25 has been shown, but the hook portion 24 may be urged to the lowering action position by its own weight.

(8) In the above-described embodiment, an example in which the cam mechanism 35 is provided has been described. However, the cam mechanism 35 may be omitted.

  The present invention can be applied to a tractor provided with a mini crawler instead of the rear wheel 4.

7 Link mechanism 9 Top link 10 Lower link 15 Link holding mechanism 16 Engagement part 20 Catcher part 22 Receiving part 24 Hook part 25 Biasing member (spring)
30 Guide part 31 Hole part 35 Cam mechanism 40 Vertically projecting part 41 Vertically projecting part 42 Hole part

Claims (7)

A link mechanism having a top link extending rearward from the vehicle body and a lower link extending rearward from the vehicle body, and connecting the work device to the vehicle body by the top link and the lower link so as to be lifted and lowered. When,
A link holding mechanism for holding the top link,
The link holding mechanism is
An engaging portion provided on the top link;
A catcher portion that is provided on the vehicle body side and holds the top link by holding the engagement portion;
The catcher part is
A receiving portion that receives the engaging portion, and a hook portion that is swingable between an operating position engaged with the receiving portion and a release position where the engagement with the receiving portion is released, A tractor that holds the engaging portion by a receiving portion and the hook portion at the operating position. The receiving portion is configured to receive the engaging portion from below,
2. The tractor according to claim 1, further comprising a guide portion that is provided on a rear side of the catcher portion and guides the engaging portion while placing and supporting the engaging portion so as to be slidable back and forth. The other of the guide part and the engaging part in a state in which the vertically projecting part provided on one of the guide part and the engaging part is engaged with the vertically projecting part so as to be relatively movable in the front-rear direction. And provided with a hole portion,
When the engaging portion slides backward on the guide portion and is located at the rear end portion of the guide portion, the vertically projecting portion is located at an end portion in the front-rear direction of the hole portion, and the engagement The tractor according to claim 2, wherein a portion is supported by being suspended by the guide portion via the vertically projecting portion. The vertically projecting portion protrudes downward from the front end of the engaging portion;
The tractor according to claim 3, wherein the hole portion is provided in the guide portion.   The tractor according to any one of claims 2 to 4, wherein the guide portion extends rearward from the receiving portion. An urging member for urging the hook portion to the operating position;
The hook portion is opposed to the biasing member by an operating force provided by the engaging portion that is provided across the hook portion and the engaging portion and is pushed toward the receiving portion. The tractor according to any one of claims 1 to 5, further comprising a cam mechanism that swings to the release position.   The tractor according to any one of claims 1 to 6, wherein the hook portion is swingably supported by the receiving portion.

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