JP3946889B2 - Work machine mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work machine mounting structure.
[0002]
[Prior art]
Conventionally, a tractor as a machine has a hitch on the machine side, while a front loader as a work machine is provided with a work machine side hitch, and the front loader is detachably attached to the tractor via both hitches. .
[0003]
The machine-side hitch is provided with a concave hook on the lower side and is positioned above the hook to form a connecting pin insertion hole, while the work machine-side hitch is engaged with the hook. A coupling pin is provided, and a coupling pin hole is formed that is positioned above the engagement pin and coincides with the coupling pin insertion hole.
[0004]
Thus, when the front loader is mounted on the tractor, first, the engagement pin is engaged with the hook of the machine side hitch, and the work machine side hitch is centered on the engagement pin. The connection pin hole of the work machine side hitch is aligned with the connection pin insertion hole of the machine side pitch so that the connection pin is inserted into both holes.
[0005]
[Problems to be solved by the invention]
However, in the work implement mounting structure described above, the work of aligning the connecting pin hole with the connecting pin insertion hole is complicated, and labor is required for the work implement mounting operation.
[0006]
Also, when performing mounting work with the front loader tip in contact with the ground, the grounded front loader is affected by the ground.For example, if the mounting location is uneven, It becomes twisted with respect to the machine, and it becomes difficult to remove the front loader as well.
[0007]
[Means for Solving the Problems]
Therefore, in the present invention, a work machine mounting structure in which the work machine side hitch is provided in the work machine, the work machine side hitch is provided in the work machine, and the work machine side hitch can be detachably attached to the work machine side hitch. in while this machine side hitch, provided with a concave hook downwards, provided toward the axis of the boss portion having a boss hole for the connecting pin inserted through is positioned above the same hook in the left-right pair The working machine side hitch is provided with an engaging pin that engages with the hook, and is positioned above the engaging pin and engaged with the positioning engagement piece that engages with the outer peripheral surface of the boss portion. Before the engaging piece for engagement with the boss portion, a pair of left and right guide rollers that slide in contact with the left and right side surfaces of the machine-side hitch to guide the positioning engaging piece to the boss portion, and the guide roller The positioning engagement piece engages with the boss. State, is to St. provide a working machine mounting structure characterized in that a pair of right and left connecting pin holes consistent with the boss hole of the boss portion.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
That is, the work machine mounting structure according to the present invention is provided with a machine-side hitch on the machine as a basic structure, while a work machine-side hitch is provided on the machine, and the work machine-side hitch is used as the machine-side hitch. It can be attached detachably.
[0011]
Such a work machine mounting structure has a characteristic structure in which the machine-side hitch is provided with a concave hook below, and a boss having a boss hole for inserting a connecting pin positioned above the hook. The working machine side hitch is provided with an engaging pin that engages with the hook, and is positioned above the engaging pin and engages with the outer peripheral surface of the boss portion. A positioning engagement piece, a guide piece that slides into contact with the boss portion before the positioning engagement piece engages the boss portion, and guides the positioning engagement piece to the boss portion; In a state where the positioning engagement piece is engaged with the boss portion, a connection pin hole is provided that matches the boss hole of the boss portion.
[0012]
In this way, when the work machine is mounted on the machine, the engagement pin is engaged with the hook, and the work side hitch is rotated toward the machine side hitch around the engagement pin. The guide piece slides into contact with the boss portion and performs a guiding function to securely engage the engagement piece with the boss portion. The engagement piece is positioned at a position where the connecting pin hole coincides with the boss hole. The connecting pin can be smoothly inserted into both holes. Therefore, the work machine can be easily mounted.
[0013]
Further, when the work machine is detached from the machine, the work machine can be easily detached by going back to the opposite procedure.
[0014]
In addition, the machine-side hitch is provided with a concave hook at the bottom and a boss portion having a boss hole for inserting a connecting pin that is positioned above the hook with the axis line in the left-right direction. The working machine side hitch is provided with an engaging pin that engages with the hook, and is positioned above the engaging pin and engaged with the positioning engagement piece that engages with the outer peripheral surface of the boss portion. Before the engaging piece for engagement with the boss portion, a pair of left and right guide rollers that slide in contact with the left and right side surfaces of the machine-side hitch to guide the positioning engaging piece to the boss portion, and the guide roller In a state where the positioning engagement piece is engaged with the boss portion, a pair of left and right connecting pin holes that match the boss hole of the boss portion are provided.
[0015]
In this way, when the work machine is mounted on the machine, the engagement pin is engaged with the hook, and the work side hitch is rotated toward the machine side hitch around the engagement pin. ,
Even if the pair of left and right guide rollers roll on the left and right side surfaces of the machine-side hitch, and the posture of the work machine-side hitch is twisted due to uneven terrain, the work machine-side hitch is forcibly moved to the machine. The engagement piece can be securely engaged with the boss by aligning with the position of the side hitch, and the engagement piece is positioned at a position where the connection pin hole coincides with the boss hole and is connected to both holes. The pin can be inserted smoothly. Therefore, the mounting operation can be performed easily.
[0016]
Further, when the work machine is detached from the machine, the work machine can be easily detached by going back to the opposite procedure.
[0017]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
A shown in FIG. 1 is a front loader as a work machine according to the present invention, and the front loader A is detachably attached to a tractor T as the machine.
[0019]
First, the tractor T will be described. As shown in FIG. 1, the tractor T is provided with a prime mover part 2 at the front part of the body frame 1 and an operation part 3 at the rear part. Left and right front and rear wheels 4, 4, 5, and 5 are attached, respectively.
[0020]
A pair of left and right hitch stays 6, 6 are attached to the middle part of the machine body frame 1, and the machine-side hitches 7, 7 are attached upward from the hitch stays 6, 6, respectively. , 7 is straddled between the upper end portions of the frontal portal type connecting frame 8.
[0021]
Further, as shown in FIGS. 1 and 2, the machine-side hitch 7 is formed with a hook 7b that is recessed downward in the middle of the front side of the hitch body 7a, and a connecting pin inserted in the rear upper part of the hitch body 7a. A boss portion 7c having a common boss hole 7d is provided with the axis line in the left-right direction.
[0022]
Next, the front loader A according to the present invention will be described with reference to FIGS.
[0023]
That is, the front loader A includes a pair of left and right work implement side hitches 10 and 10, a pair of left and right lift arms 11 and 11 pivotally supported by the base end portions of the work implement side hitches 10 and 10, and both lift arms 11 and 10. The attachment hitch 12 laid horizontally between the tips of the 11, the bucket 13 as an attachment detachably attached to the attachment hitch 12, and the lift arms 11, 11 in order to lift and lower the lift arms 11, 11. Arm cylinders 14 and 14 interposed between the machine and the work machine side hitches 10 and 10, and the right and left side parts of the bucket 13 and the middle parts of the lift arms 11 and 11 to rotate the bucket 13. Bucket cylinders 15 and 15 interposed between the lift arms 11 and 11 and a stand 16 attached to the tip of the lift arms 11 and 11. Reference numerals 11a, 11b, 12a, 14a, 14b, 15a, 15b, 18a, 19a, and 19b are pivotal support and connecting portions, respectively. 17 is a bucket link, 18 is a cylinder / rod support, and 19 is an interlocking rod.
[0024]
Here, as shown in FIG. 1, the stand 16 is pivotally supported by a lift pin 11 with a pivot pin 25 and a storage posture along the lift arm 11. It is possible to change the posture to the use posture with the grounded part, and the stand 16 uses the distal end portion of the support arm 26 pivotally supported by the lift arm 11 as the storage posture via the stand connecting pin 27. Each of the postures can be connected to hold each posture.
[0025]
As shown in FIG. 2 and FIG. 3, the pair of left and right work implement side hitches 10 and 10 has an engaging pin 10b mounted horizontally between the lower portions of the pair of left and right hitch forming pieces 10a and 10a. Positioning engagement pieces 10c, 10c that engage with the outer peripheral surface of the boss 7c of the machine-side hitch 7 are provided on the inner surface of the rear halfway part 10a, and both the engagement pieces 10c, 10c are the boss 7c. In the state of being engaged with the boss portion 7c, connecting pin holes 10d and 10d that coincide with the boss hole 7d of the boss portion 7c are formed, and the connecting pin 20 is removably inserted into the holes 7d, 10d, and 10d. . 21 is a retaining pin inserted through the end of the connecting pin 20, and 22 is a retaining pin locking piece.
[0026]
Moreover, as shown in FIGS. 2 and 3, before the positioning engagement pieces 10c, 10c are engaged with the boss portion 7c, the boss portion 7c is formed on the inner side surfaces of the pair of left and right hitch forming pieces 10a, 10a. A pair of left and right guide pieces 10e, 10e for guiding the positioning engagement pieces 10c, 10c to the boss portion 7c are provided in sliding contact with the outer peripheral surface.
[0027]
Further, as shown in FIGS. 2 and 4, before the pair of left and right hitch forming pieces 10a and 10a is engaged with the boss 7c, A pair of left and right guide rollers 10f, 10f that slide in contact with the left and right side surfaces of the side hitch 7 and guide the positioning engagement pieces 10c, 10c to the boss portion 7c are rotatably mounted. 10g is a roller support shaft.
[0028]
Next, a procedure for attaching and detaching the front loader A to the tractor T will be described with reference to FIGS.
[0029]
First, the installation work procedure of the front loader A will be described.
[0030]
(1) As shown by the solid line in FIG. 5, the tractor T is slowly and straightly advanced to the center of the front loader A that is self-supported by the stand 16, and the engaging pins 10b, Place the hooks 7b, 7b of the machine-side hitch 7, 7 at a position directly below 10b.
[0031]
(2) The lift arm cylinders 14 and 14 of the front loader A and the bucket cylinders 15 and 15 are connected to a hydraulic pressure source (not shown) provided in the tractor T through hydraulic piping (not shown).
[0032]
(3) As shown by the one-dot chain line in FIG. 5, the operating lever (not shown) is operated to cause the lift arm cylinders 14 and 14 to extend so that the engaging pins 10b and 10b are connected to the machine-side hitch 7. It is made to contact | abut to the front end surface.
[0033]
(4) As shown by the one-dot chain line in FIG. 6, the operation lever is operated to extend the bucket cylinders 15 and 15 (the bucket 13 is rotated downward), and the hooks 7b and 7b are engaged with the engaging pins 10b and Engage 10b.
[0034]
(5) As shown by the solid line in FIG. 6, by operating the operating lever to shorten the lift arm cylinders 14 and 14, the work machine side hitch 10 is moved to the main unit side with the engaging pins 10b and 10b as the center. As shown in FIG. 7, when the front wheels 4 and 4 of the tractor T are lifted about 2 to 3 cm from the ground G as shown in FIG. 7, the guide pieces 10e and 10e are moved to the boss portion 7c. The positioning engagement pieces 10c, 10c can be reliably engaged with the boss portion 7c by sliding contact with the outer peripheral surface, and the engagement pieces 10c, 10c can connect the connecting pin holes 10d, 10d to the boss hole 7d. Since the positioning is performed at the position to be matched, the connecting pin 20 can be smoothly inserted into the holes 10d, 10d, and 7d.
[0035]
At this time, since the guide rollers 10f and 10f attached to the pair of left and right hitch forming pieces 10a and 10a of the work machine side hitch 10 are in contact with the left and right side surfaces of the machine side hitch 7, respectively, Even when the hitch 10 is twisted due to rough terrain or the like, the work machine side hitch 10 is forcibly aligned with the position of the main unit side hitch 7 and the positioning mechanism for the boss 7c described above is used. The engagement of the connecting pieces 10c, 10c and the matching of the connecting pin holes 10d, 10d to the boss hole 7d are performed smoothly and surely, so that the connecting pin 20 can be smoothly inserted into the holes 7d, 10d, 10d. It can be carried out. As a result, the mounting work of the front loader A to the tractor T can be easily performed.
[0036]
Next, the procedure for removing the front loader A will be described.
[0037]
(1) As shown in FIG. 7, in a state where the bucket 13 is separated from the ground G, the operation lever is operated to extend the bucket cylinders 15 and 15 (the bucket 13 is rotated downward).
[0038]
(2) As shown in FIG. 7, the operation lever is operated to shorten the lift arm cylinders 14 and 14 so that the front wheels 4 and 4 of the tractor T are lifted from the ground G by about 2 to 3 cm.
[0039]
(3) As shown in FIG. 7, the posture of the stand 16 is changed from the stored posture to the use posture.
[0040]
(4) Pull out the connecting pin 20.
[0041]
(5) As shown in FIG. 8, the operating lever is operated to extend the lift arm cylinders 14 and 14 to rotate the work implement side hitch 10 forward about the engaging pins 10b and 10b.
[0042]
(6) As shown in FIG. 9, by operating the operation lever, the bucket cylinders 15 and 15 are shortened (the bucket 13 is rotated upward), and the tip of the grounded stand 16 is used as a fulcrum for lifting. By rotating the arms 11 and 11 counterclockwise, the engagement pins 10b and 10b of the work machine side hitch 10 are pulled upward, and the engagement is released from the hook 7b of the machine side hitch 7.
[0043]
(7) Disconnect the hydraulic piping from the tractor T hydraulic source.
[0044]
(8) The tractor T is moved backward and moved to a place away from the front loader A.
[0045]
In this way, it is possible to easily remove the front loader A from the tractor T.
[0046]
FIG. 10 shows an attachment structure of an engagement pin 10b as another embodiment, and the engagement pin 10b is formed at the lower end of the hitch forming pieces 10a, 10a of the work machine side hitch 10 at the long holes 30, 30 is formed so as to extend in the vertical direction, and is slidably inserted into the elongated holes 30 and 30. Between the end of the engagement pin 10b and the hitch forming piece 10a, a tension spring 31 is provided. The engaging pin 10b is elastically biased so as to be pulled upward along the long holes 30 and 30.
[0047]
The lower end of the hitch-forming piece 10a pivotally supports one end of the lock piece 32, and the lock piece 32 engages with the engagement pin 10b located at the lower end of the long hole 30, thereby The position of the lock piece 32 can be freely changed by rotating between a lock position for fixing the lock 10b and a lock release position for releasing the engagement with the engagement pin 10b. Can be fixed to the hitch forming piece 10a by the fixing pin 33 at the locked position. 34 is a pivot pin.
[0048]
In this way, by changing the position of the lock piece 32 to the unlock position, the engagement pin 10b can be pulled up to the upper end position of the long hole 30 by the tension spring 31, and the engagement with the hook 7b can be released. I am doing so.
[0049]
Therefore, when the front loader A is removed from the tractor T, the connecting arm 20 is simply pulled out and the bucket cylinders 15 and 15 are shortened, and the lift arms 11 and 11 are used with the tip of the grounded stand 16 as a fulcrum. The work machine side hitch 10 can be decoupled from the machine side hitch 7 by rotating counterclockwise.
[0050]
At this time, since the engagement pin 10b is disengaged from the hook 7b, it is not necessary to extend the lift arm cylinder 14 to disengage the engagement pin 10b from the hook 7b. It is possible to reduce the labor of the separation work.
[0051]
FIG. 11 and FIG. 12 show the structure of a hook 7b as another embodiment. The hook 7b is connected to a pair of left and right fixed side hook forming pieces 7e, 7e formed in the front middle part of the hitch body 7a. The movable-side hook-forming piece 7f is configured to be slidably and fixedly connected by a slide / fixing connection pin 40.
[0052]
That is, elongated holes 41, 41, 42 of the same shape are formed in each of the hook forming pieces 7e, 7e, 7f, and the slide / fixing connection pin 40 is inserted into these elongated holes 40, 40, 41. The connecting pin 40 is fitted with the elongated holes 40, 40, 41 at the base end portion to form a fixing pin forming piece 40a for fixing the movable side hook forming piece 7f, and at the distal end portion, the movable side hook A small-diameter sliding pin forming piece 40b that makes the forming piece 7f freely slidable is formed. 40c and 40d are retaining pin insertion holes, and 47 is a retaining pin.
[0053]
A torque spring 43 is interposed between the lower end portion of the fixed side hook forming piece 7e and the lower end portion of the movable side hook forming piece 7f, and the movable side hook forming piece 7f is slid downward by the torque spring 43. It is elastically biased. 44 is a torque spring support shaft, 45 is a spring locking piece, and 46 is a spring locking hole.
[0054]
In this way, by aligning the long holes 41, 41, 42 and fitting the fixing pin forming pieces 40a into these long holes 41, 41, 42, the movable side hook forming pieces 7f are fixed to the fixed side. It can be held at the hook forming position where the hook 7b is formed together with the hook forming pieces 7e, 7e, and the fixing pin forming piece 40a is fitted and detached from the long holes 41, 41, 42 to form a slide pin. When the piece 40b is inserted into the long holes 41, 41, 42, the movable-side hook forming piece 7f is slid downward by the torque spring 43 to be held at the hook non-forming position where the hook 7b is not formed. To be able to.
[0055]
Accordingly, by changing the position of the movable-side hook forming piece 7f from the hook forming position to the hook non-forming position, the engagement with the engaging pin 10b engaged at the hook forming position can be released.
[0056]
As a result, in this case as well, as in the case of the sliding engagement pin 10b described above, it is not necessary to extend the lift arm cylinder 14 for releasing the engagement pin 10b from the hook 7b. It is possible to reduce the time and effort of the separation work.
[0057]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0058]
In the first aspect of the present invention, the work machine side hitch is provided on the work machine, while the work machine side hitch is provided on the work machine so that the work machine side hitch can be detachably attached to the work machine side hitch. In the machine mounting structure, the machine-side hitch is provided with a concave hook below, and a boss part having a boss hole for inserting a connecting pin is provided with the axis line in the left-right direction. A pair of left and right work implement side hitches provided with engaging pins that engage with the hooks, and positioning positioning pieces that are positioned above the engaging pins and engage with the outer peripheral surface of the boss portion; A pair of left and right guide rollers that slide in contact with the left and right side surfaces of the machine-side hitch before the positioning engagement pieces engage with the bosses , and the guide rollers The positioning engagement piece is guided to the boss. In combined state, because it is provided with a pair of right and left connecting pin holes consistent with the boss hole of the boss, when installed on this machine is a working machine, and an engagement pin engaged with the hook When the work side hitch is rotated toward the machine side hitch around the same engagement pin, the pair of left and right guide rollers roll on the left and right side surfaces of the machine side hitch, and the work machine side hitch posture Even if the machine is twisted due to rough terrain, the work piece side hitch can be forcibly aligned with the posture of the machine side hitch so that the engagement piece can be securely engaged with the boss. The engaging piece is positioned at a position where the connecting pin hole coincides with the boss hole, and the connecting pin can be smoothly inserted into both holes. Therefore, the work machine can be easily mounted.
[0059]
Further, when the work machine is detached from the machine, the work machine can be easily detached by going back to the opposite procedure.
[Brief description of the drawings]
FIG. 1 is a side view of a tractor equipped with a float loader as a working machine according to the present invention.
FIG. 2 is a side view of a work machine side hitch.
FIG. 3 is a plan view of the work machine side hitch.
FIG. 4 is a plan view of the work machine side hitch.
FIG. 5 is an explanatory diagram of a mounting operation state of the front loader.
FIG. 6 is an explanatory diagram of a mounting work state of the front loader.
FIG. 7 is an explanatory diagram of a mounting work state of the front loader.
FIG. 8 is an explanatory diagram of a detachment work state of the front loader.
FIG. 9 is an explanatory diagram of a detachment work state of the front loader.
FIG. 10 is a side view of an engagement pin as another embodiment.
FIG. 11 is a side view of a hook as another embodiment.
12 is a cross-sectional view taken along line II in FIG.
[Explanation of symbols]
A Front loader T Tractor 1 Airframe frame 2 Motor unit 3 Driving unit 4 Front wheel 5 Rear wheel

Claims (1)

In this work machine mounting structure, the work machine side hitch is provided on the work machine, while the work machine side hitch is provided on the work machine so that the work machine side hitch can be detachably attached to the machine side hitch.
While the machine-side hitch is provided with a concave hook at the bottom, a boss portion having a boss hole for inserting a connecting pin is provided with the axis line in the left-right direction, positioned above the hook.
A pair of left and right work implement side hitches are provided with an engagement pin that engages with the hook, and a positioning engagement piece that is positioned above the engagement pin and engages with the outer peripheral surface of the boss portion; A pair of left and right guide rollers that slide in contact with the left and right side surfaces of the machine-side hitch and guide the positioning engagement pieces to the boss before the positioning engagement pieces engage with the boss, and guide to the guide rollers A work machine mounting structure comprising a pair of left and right connecting pin holes that coincides with the boss hole of the boss portion in a state where the positioning engagement piece is engaged with the boss portion.

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