JPH073849Y2 - Connection device between tractor and work implement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a coupling device between a tractor and a working machine.

(Prior Art) When connecting a rotary tiller to the rear of a tractor in a vertically movable and removable manner via a three-point link mechanism consisting of a central top link and a pair of left and right lower links. Technology that makes it easy to
This is disclosed in JP-A-60-259104 (conventional example 1).

In the above, the working machine side end portions of the top link and both lower links are connected by a connecting body, and the connecting body has an upper engaging portion on the top link side and a lower engaging portion on both lower link sides. On the other hand, the cultivating device has an upper engaged portion whose upper engaging portion is disengageably engaged when the connecting body is raised and a pair of left and right lower engaging portions are disengageably engaged. And the lower engaged portion to be fitted, and the connecting body is further raised after the upper engaging portion is engaged, whereby the working machine is rotated around the upper engaging portion to the tractor side, and is connected. Each lower engaging part of the body is engaged with the lower engaged part in a disengageable manner, and each lower engaging part on each of the left and right side parts of the connecting body can release the disengagement from the lower engaged part. Is equipped with a blocking device for blocking.

Therefore, in the above-mentioned thing, when connecting the tractor and the tiller, the tractor is moved backward to bring it closer to the tiller side, and then the connector is raised so that the connector is the upper and lower engaged parts of the tiller. It is advantageous that the both lower links can be connected to the tilling device by an easy work of engaging with the lower engaging portion of the connecting body from the lower engaged portion by the blocking device.

However, in this technology, since the upper and lower engaging parts on the three-point link mechanism side and the upper and lower engaged parts on the working machine side are both immovable at the upper and lower three points, there is a manufacturing error. In some cases, it may become impossible to engage and disengage, and even if it is possible to engage (connect), there is a risk of rattling vibration.

Therefore, as one of the above-mentioned conventional techniques, a technique disclosed in Japanese Patent Publication No. 51-21881, that is, a conventional technique in which the connecting body on the three-point link mechanism side has a telescopic structure and a spring is provided to prevent backlash. It is conceivable to apply (adopt) No. 2 above.

(Problems to be solved by the invention) However, if the conventional technique 2 is adopted as the conventional technique 1,
The top link side (upper engagement part) is engaged earlier than the lower link side (lower engagement part), the three-point link mechanism is raised, and the working machine is rotated around the upper engagement part to be connected. This is impossible because the spring is used for the three-point link mechanism, which is contrary to the ease and speed of connection, and in some cases, cannot be connected.

In addition, when the tractor is self-propelled with the working machine resting (removed), the three-point link mechanism is sprung by the spring due to the traveling vibration, and the spring is very tired and dangerous.

The present invention aims to solve such a problem.

(Means for Solving the Problems) In the present invention, the working machine R is detachably connected to the tractor 1 via a three-point link mechanism 9 including a top link 10 and a pair of left and right lower links 11. Lifting device 3 for lower link 11
In the one that can be raised and lowered by the above, the technical means taken in order to achieve the above-mentioned object is to provide a connecting body 14 that connects the work machine side end portions of the top link 10 and the lower links 11 to each other, The connecting body 14 has an upper engaging portion on the top link 10 side.
22 has a lower engaging portion 18 on both lower link 11 sides, and the working machine R has an upper engaged portion with which the upper engaging portion 22 is detachably engaged when the connecting body 14 is raised. Top mast with 45 29
A bracket 31 having a lower engaged portion 46 with which the lower engaging portion 18 of the connecting body 14 engages in a disengageable manner, and a pair of left and right support links 39 connecting the top mast 29 and the bracket 31 to each other. Each of the lower engaged portions 46 is provided with a blocking mechanism 47 that releasably prevents the lower engaged portion 18 from being disengaged from the lower engaged portion 46. When the work machine R is not connected, the vertical distance L between the upper engaging portion 22 and the lower engaging portion 18 is the vertical distance L1 between the upper engaged portion 45 and the lower engaged portion 46.
The support link 39 is formed of an elastic body that urges the upper engagement portion 45 downward so as to be equal to or larger than the above.

(Operation) When connecting the tractor and the working machine R, the three-point link mechanism 9 is raised by the lifting device 3 so that the upper engaging portion 22 on the top link 10 side is brought into contact with the upper engaged portion 45 of the working machine R. And engages the lower engaging portion 18 on the lower link 11 side with the working machine R.
It is positioned below the front of each lower engaged portion 46 on the side (see FIG. 3).

When the three-point link mechanism 9 is further raised in this state, the upper engaged portion 45 of the top mast 29 is raised against the elastic force of the support link 39 made of an elastic material, and the top mast 29 is lifted at the upper limit position. While being fixed, the work machine R is rotated forward around the upper engaging portion 22 to move the lower engaging portion 18 and the lower engaged portion.
46 is engaged, and the blocking mechanism 47 blocks the lower engaged part 18 from being disengaged from the lower engaged part 46.

In order to separate the tractor 1 and the working machine R from each other, the blocking mechanism 47 releases the blocking prevention of the lower engaged portion 18 from the lower engaged portion 46, and the three-point link 9 is lowered by the lifting device 3. Good.

(Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
In FIG. 6, 1 is a tractor, 2 is a tractor vehicle body, 3
Is a hydraulic device for raising and lowering a working machine, which is exemplified as a lifting device mounted on the rear portion of the tractor body 2, and has a pair of left and right lift arms 4. 5 is a seat, 6 is a rear wheel, 7 is a rear wheel fan, and 8 is a PTO shaft, which projects rearward from the rear end of the vehicle body 2.

R is a side-drive type rotary tiller exemplified as a working machine, and is connected to the rear of the tractor 1 via a three-point link mechanism 9 so as to be vertically movable and detachable.

The three-point link mechanism 9 is composed of a top link 10 shown as an upper connecting link in the center and a lower link 11 shown as a pair of left and right lower connecting links. Each lower link 11 and each lift arm 4 are respectively lift rods 12. Are connected by.

As shown in FIGS. 1 to 3, reference numeral 14 denotes a connecting body which connects the work machine side end portions of the top link 10 and both lower links 11, that is, the rear end portions, and projects upward. A cylindrical main body 15 having a mountain shape in a front view, and a pair of left and right side plates projecting obliquely upward and rearward from an upper end portion of a central portion in the left-right direction of the main body 15.
16, a pair of left and right cylinders 17 arranged in the left and right direction on both left and right ends of the main body 15, and left and right protruding from the outer end of each cylinder 17 to the outside and having a smaller diameter than the cylinder 17. It has a lower engaging portion 18 shown by a pair of connecting shafts.

A ball joint portion 20 at the rear end of the top link 10 is detachably connected by a mounting pin 21 between the front portions of the left and right side plates 16. A notch that opens obliquely upward and rearward is formed in the rear part of each side plate 16, and the upper part of the notch is designed to gradually expand toward the upper end, where the notch is on the top link 10 side. And the upper engaging portion 22.

At the outer end of each cylinder 17, a hollow truncated cone-shaped side guide is provided.
23 is externally fitted and fixed with the small-diameter end portion on the outer side.

A circumferential groove 24 is formed on the inner side of each lower engaging portion 18, and a ball joint portion 25 of each lower link 11 is detachably fitted on the outer side of the lower engaging portion 18 and is retained by a pin 26.

The working machine R includes an input case 27 located in the center of the front upper part in the left-right direction, a top mast 29 projecting obliquely upward and forward from the input case 27 and including a pair of left and right side plates 28.
A pair of support arms 30 projecting from the input case 27 to the left and right sides, a pair of left and right brackets 31 projecting forward from the midway part of each support arm 30 in the longitudinal direction of the top mast 29. A pair of left and right support links 39 that connect a pair of left and right brackets 31 to each other, and a transmission case that is provided below the outer ends of the support arms 30, respectively.
32 and a side plate, a cultivating part 33 which is horizontally driven between the lower ends of the transmission case 32 and the side plate and is rotationally driven, and includes a cultivating shaft and a large number of cultivating claws provided for the cultivating part 33,
A tillage cover 34 covering the tillage part 33, a pair of left and right gauge wheels 35, and a tilling depth adjusting mechanism 36 for moving the gauge wheels 35 up and down.
And so on.

The top mast 29 is rotatably (up and down) pivotally attached to the projection 37 of the input case 27 via a lateral pin 38, and the upper end of each support link 39 is pivotally supported by a pin 40. The lower end of each support link 39 to the bracket 31 with a pin 41
Each support link 39 is formed of a leaf spring material, and the upper end side of the top mast 29 is moved downward.
That is, the elastic body is biased in the direction of the arrow F, and 42 is the elastic bending portion.

An input shaft 44 protruding forward is rotatably supported by a bearing in the input case 27, and the input shaft 44 and the PTO shaft 8 are connected by a universal joint shaft 43.

Between the upper ends of both side plates 28 of the top mast 29, an upper engaged portion 45 exemplified by a pin is provided in the left-right direction, and the upper engaging portion 22 of the coupling body 14 is provided on the upper engaged portion 45. It is engaged and disengaged from the lower side, that is, fitted and detachable.

As shown in FIGS. 1 and 4, reference numeral 46 denotes a pair of left and right lower engaged portions that are substantially U-shaped in a side view, and are fixed to the front portions of the brackets 31 so as to project forward. The lower engaged portion 46 has a frontward and downward slanted shape, and an upper wall portion thereof projects forward from the lower wall portion, and a front lower surface of the upper wall portion is forwardly slanted and inclined. . The respective lower engaging portions 18 of the connecting body 14 are engaged in the respective lower engaged portions 46 from the front side so as to be engageable and disengageable from the front side, that is, fitted in and disengageable.

Here, when the working machine is not connected, the vertical distance L between the upper and lower engaging portions 22 and 18 is larger than or substantially equal to the vertical distance L1 between the upper and lower engaged portions 45 and 46. To be equal,
The support link 39 has elastic force, and each part 18, 22, 4
When connecting 5,46, the curved portion 42 is extended by elastic force so that L = L1.

As shown in FIG. 7 to FIG. 9, 47 is a pair of left and right blocking devices that releasably prevent the lower engaging portions 18 from being disengaged from the lower engaged portions 46. 48 and retaining pin 49
And a biasing spring 50, a restricting body 51 and the like.

The mounting cylinder 48 is vertically erected on the upper surface of the upper wall portion of the lower engaged portion 46 in a tilted posture.
52 are erected. A semicircular engagement recess 53 is formed at the upper end of the fixed plate 52.

The retaining pin 49 is movably inserted in the axial direction of the mounting barrel 48 and the mounting barrel 48 of the lower engaged portion 46, that is, in a substantially vertical direction. The retaining pin 49 is shown in FIG. As described above, a blocking device that advances into the lower engaged portion 46 and engages with the circumferential groove 24 of the lower engaging portion 18 to prevent disengagement from the lower engaged portion 46 of the lower engaging portion 18. As shown in FIG. 8, the position of the lower engaged portion 46 can be retreated upward and the position can be changed to an allowable position that allows engagement and disengagement of the lower engaged portion 18 with respect to the lower engaged portion 46. ing. still,
At the blocking position of the retaining pin 49, the retaining pin 49 is inserted through the upper and lower wall portions of the lower engaged portion 46.

At the lower end of the outer peripheral surface of the retaining pin 49, a locking receiving surface 54 that is tapered downward is formed.
A U-shaped hooking metal fitting 55 is fixed to the upper end of the hook so as to project upward, and the lower end of the hooking metal fitting 55 is engaged with the fixing plate 52 as shown in phantom in FIG. The retaining pin 49 is switchably locked between the blocking position and the releasing position by being engaged with the recess 53 so as to be detachable.

A spring receiving ring 56 and a retaining ring 57 that holds the ring 56 are provided in the middle of the outer peripheral surface of the retaining pin 49 in the vertical direction, and the spring receiving ring 56 and the upper end portion side of the mounting cylinder 48 are provided. An urging spring 50 wound around a retaining pin 49 is elastically interposed between the spring receiving ring 58 and the retaining pin 49, and the retaining pin 49 is moved downward, that is,
It is biased toward the blocking position.

A support shaft 59 is provided so as to project inward from the lower end portion of the front portion of each bracket 31, and the lower end portion of the restricting body 51 is rotatably provided on the support shaft 59.

The restricting body 51 is inserted into a notch 60 formed in the lower engaged portion 46, and the upper end portion of the front end face thereof is a forward-downward inclined slanting face 61, which is the engagement of the front end face. The lower side of the stop surface 61 is a forwardly inclined cam surface 62.

As shown in FIG. 8, the restricting body 51 has a retaining position where the retaining surface 61 retains the retaining receiving surface 54 of the retaining pin 49 to releasably retain the retaining pin 49 in the blocking position. As shown by the phantom line in FIG. 7 or FIG. 8, the position can be freely changed to the position where the holding is released.

In the holding position, the restricting body 51 contacts the inner surface of the lower end portion of the cutout portion 60, and the inner surface serves as a stopper portion 63. In the releasing position shown in FIG. 24 is in contact with the inside.

As shown by the phantom line in FIG. 8, the restricting body 51 is located at the rearmost release position at the position where it comes into contact with the support arm 30, but even in this releasing position, the center of gravity of the restricting body 51 remains unchanged. ,
It is arranged to be on the front side of the vertical line P passing through the center of the support shaft 59, so that the regulation body 51 is urged toward the holding position by its own weight regardless of which release position it is.

Further, in the embodiment, the universal joint is used as the joint for connecting the PTO shaft and the input shaft, but other joints may be used.

Further, in the embodiment, the rotary tiller is used as the working machine, but a working machine other than the rotary tiller may be used.

Furthermore, the present invention can be applied to a device that connects a working machine to the front side of a tractor.

Further, the upper engaging portion 22 has a pin shape, and the upper engaged portion 45
May be a cutout of the lower opening.

Next, connection and disconnection according to the embodiment will be described.

Before connection, the working machine R is placed on the ground and is in a slightly forward leaning posture as shown in FIG. 3, but in this working machine R, as shown in FIG. As also shown,
The retaining pin 49 of the blocking device 47 is pulled up to the blocking position,
It is held by the restricting body 51 at the holding position, and the hook metal fitting 55 is oriented horizontally.

In the above case, the center of gravity of the restriction body 51 is set so that the restriction body 51 in the release position is biased toward the holding position side by its own weight, and the restriction body 51 is positioned at the holding position by the stopper 63. Therefore, when setting the retaining pin 49 to the blocking position, simply pulling the retaining pin 49 to the blocking position causes the restricting body 51 to automatically change its position from the release position to the holding position. When the retaining pin 49 is released, the retaining pin 49 is held in the blocking position by the restricting body 51, so that the retaining pin 49 can be easily set in the blocking position.

In this state, the tractor 1 is moved backward to approach the working machine R, and as shown in FIG. 3, below the upper and lower engaged parts 45, 46 of the working machine R, above the coupling body 14. Engaging portion 22 and each lower engaging portion 1
Position 8 respectively.

In this case, L ≧ L1, and the upper engaged portion 45 is urged downward by the elastic force of the support link 39 made of an elastic material.

Next, the three-point link mechanism 9 and the connecting body 14 are gradually raised by the elevating device 3 to first engage the upper engaged portion 45 in the upper engaging portion 22 of the connecting body. In the state, each lower engaging portion 18 is located on the front side of each lower engaged portion 46.

When the three-point link mechanism 9 and the connecting body 14 are further raised, the upper engaged portion 45 is engaged in the upper engaging portion 22 of the connecting body 14, so that the three-point link is formed. As the mechanism 9 etc. rises, the top mast is resisted against the elastic force of the support link 39.
29 is lifted in the direction opposite to the arrow F and is fixedly held within the limit of the support link 39, and the working machine R is lifted and rotated around the upper engaging portion 22 to the tractor 1 side, that is, the front side. To be

As a result, as shown in FIG. 8, each lower engaging portion 18 is relatively engaged in each lower engaged portion 46 from the front side and abuts on the cam surface 62 of the restricting body 51. As shown in FIG. 7, each lower engaging portion 18 engages with a predetermined position at the rear portion of each lower engaged portion 46 by rotating the regulating body 51 rearward.

Further, the regulation body 51 is turned to the rear side to a release position where the retention of the retaining pin 49 is released. As a result, the retaining pin 49 is moved downward by the biasing spring 50, as shown in FIG. As shown in the drawing, it is in the retaining position and engages with the circumferential groove 24 of each lower engaging portion 18, and prevents the lower engaging portion 18 from being disengaged from the lower engaged portion 46.

In the above case, even if the lower engaging portion 18 deviates from the regular movement path, the outer surface of each side guide body 23 and each lower engaged portion 46.
By the relative sliding of and, the position of each lower engagement portion 18 is corrected to the normal movement path.

As described above, the work of connecting the work implement R to the tractor 1 is completed.

Next, when the work implement R is separated from the tractor 1, work is performed in the reverse order of the above.

(Effect of the Invention) As described in detail above, according to the present invention, not only the lower link but also the top link can be easily connected to the working machine, and the working machine can be connected to the tractor through the three-point link mechanism. Can be performed more easily and in a shorter time. Also, if the upper and lower engaged parts on the working machine side do not engage with the upper and lower engaged parts on the three-point link mechanism at the same time, or due to manufacturing errors, etc. Even if they are deviated, the elastic deformation of the elastic body allows the upper and lower engaging portions to satisfactorily engage with the upper and lower engaged portions without any problem.

In addition, it is the elastic body that corrects or absorbs the above-mentioned misalignment of the respective parts in the vertical direction, and since this is provided on the working machine side, the engagement (connection) via the lifting of the three-point link mechanism is also possible. It can be done quickly and easily, and since the three-point link mechanism can be connected and held by the linking body, the jump of the three-point link mechanism can be prevented even if the work machine is removed and the tractor is self-propelled. .

Further, since the elastic force is applied by the elastic body, the structure can be simplified.

[Brief description of drawings]

1 to 9 show a first embodiment of the present invention, in which FIG. 1 is a partial sectional side view of an essential part, FIG. 2 is a front view of the same, and FIG.
FIG. 4 is a partial cross-sectional side view of the main part during connection work, FIG. 4 is a partial cross-sectional plan view of the main part, FIG. 5 is a partial cross-sectional front view of the connection part between the connection body and the top link, and FIG. Is a side view of the whole, FIGS. 7 and 8 are vertical cross-sectional views of a blocking device and a lower engaging portion showing different actuating postures, and FIG. 9 is a view taken in the direction of arrow A in FIG. DESCRIPTION OF SYMBOLS 1 ... Tractor, 9 ... Three-point link mechanism, 10 ... Top link, 11 ... Lower link, 18 ... Lower engaging part, 22 ... Upper engaging part, 29
... top mast, 31 ... bracket, 39 ... support link, 45 ... upper engaged portion, 46 ... lower engaged portion, 47 ... blocking mechanism.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenkichi Nosaka, 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd. Sakai Works (56) References JP-A-51-51406 (JP, A)

Claims (1)

[Scope of utility model registration request] A work machine (R) is detachably connected to a tractor (1) through a three-point link mechanism (9) consisting of a top link (10) and a pair of left and right lower links (11), A structure in which both lower links (11) can be moved up and down by an elevating device (3), and a connecting body (14) for connecting the work machine side end side of each of the top link (10) and both lower links (11) to each other. And the connecting body (14) has an upper engaging portion (22) on the top link (10) side.
Has a lower engaging portion (18) on both lower links (11) side, and the working machine (R) has an upper engaging portion (22) which can be engaged and disengaged when the connecting body (14) is raised. A top mast (29) having an upper engaged portion (45) that engages with the lower engaging portion (18) of the connecting body (14).
A bracket (31) having a lower engaged portion (46) that is releasably engaged with each other, and a pair of left and right support links (39) connecting the top mast (29) and the bracket (31) to each other. And a blocking mechanism (47) for releasably blocking the lower engaged portion (46) from being disengaged from the lower engaged portion (46) of the lower engaging portion (18).
When the three-point link mechanism (9) is not connected to the working machine (R), the vertical distance (L) between the upper engaging portion (22) and the lower engaging portion (18) is increased. The engaged portion (45) and the lower engaged portion (4
The support link (39) is formed by an elastic body that biases the upper engaged portion (45) downward so as to be greater than or equal to the distance (L1) in the vertical direction with respect to 6). A device for connecting a tractor and a working machine, which is characterized in that