JP6804590B2 - Work vehicle and front loader - Google Patents

Description

The present invention relates to a front loader that can be attached to and detached from an airframe and a work vehicle provided with the front loader.

As the work vehicle as described above, for example, the work vehicle described in Patent Document 1 is already known.
The work vehicle described in Patent Document 1 is provided with a front loader that can be attached to and detached from the machine body. In the work vehicle described in Patent Document 1, the front loader is mounted on the machine body by inserting the mounting pins into the connecting pin holes on the front loader side and the mounting pin holes on the machine body side.

Japanese Unexamined Patent Publication No. 2014-5690

In the work vehicle described in Patent Document 1, in order to attach the front loader to the machine body, the above-mentioned work must be performed, which is troublesome.

In view of the above situation, there is a demand for a front loader that can be easily attached to and detached from the machine and a work vehicle equipped with the front loader.

A feature of the present invention is that a front loader that can be attached to and detached from the machine body and a mounting mechanism for mounting the front loader on the machine body are provided, and the mounting mechanism includes an engaged member provided on the machine body. The front loader is provided with an engaging member that can engage with the engaged member, and the mounting mechanism engages the engaging member with the engaged member from above. As a result, the front loader is attached to the machine body, and the front loader can swing around a pair of left and right booms that support the work tool and a swing axis extending the base end portion of the boom in the left and right direction of the machine body. A pair of left and right side frames that are supported by the above and detachably attached to the machine body are provided, and the engaging member is engaged with the engaged member at an engaging position and engaged with the engaged member. operating member for operating the switching on and a disengaged position where it does not focus is in Rukoto provided inside the outer portion in the vehicle body width direction of the side frame.

Further, in the present invention, the mounting mechanism is provided with a support member provided on the front loader and capable of supporting the engaged member. In the engaging member, the engaged member is the support member. It is preferable to engage with the engaged member while being supported by the member.

Further, in the present invention, it is preferable that the engaging member is a hook, the engaged member is a boss portion, and the hook engages with the boss portion from above.

Further, in the present invention, a pin is provided at a portion below the hook in the front loader, and a recess is provided at a portion below the boss portion in the airframe so that the pin opens upward. It is preferable that the front loader is attached to the airframe by engaging the hook with the boss portion while being fitted in the recess.

Further, in the present invention, it is preferable that the swing fulcrum of the hook is located on the front side in the front-rear direction of the machine body with respect to the boss portion in a state where the hook is engaged with the boss portion.

Further, in the present invention, it is preferable that the operating member is housed inside the side frame and can be artificially operated from the driving unit on which the operator is boarded.

The feature of the present invention is a front loader that can be attached to and detached from the machine body, and is provided with a mounting mechanism for mounting the front loader on the machine body, and the mounting mechanism engages with the engaged member on the machine body side. A possible engaging member is provided, and the mounting mechanism supports the work tool by mounting the front loader on the machine body by engaging the engaging member from above with the engaged member. A pair of left and right booms and a pair of left and right side frames that swingably support the base end of the boom around the swing axis extending in the left-right direction of the machine and are detachably attached to the machine are provided. The operating member that switches the engaging member between the engaging position that engages with the engaged member and the non-engaging position that does not engage with the engaged member is in the body width direction of the side frame. It is provided on the inner side of the outer part.

It is a right side view which shows a tractor. It is a top view which shows the front part of a tractor. It is a right side sectional view which shows the front loader attached to the airframe. It is a right side sectional view which shows the front loader in a state supported by a stand. It is a right side sectional view showing the front loader in a state where the boom is raised and the bucket is dumped to the position where it abuts on the stand. It is the right side sectional view which shows the front loader in the state which dumped the bucket to the most dump position. It is the right side sectional view which shows the front loader in the state which the stand is housed. It is a right side view which shows the interlocking mechanism. It is a rear view which shows the state which the bucket is attached to the attachment frame. It is a rear view which shows the lock mechanism and the connecting part. It is a right side sectional view which shows the lock mechanism and the connecting part. It is sectional drawing which shows the lock mechanism and the connecting part. It is an exploded perspective view which shows the mounting mechanism. It is a right side sectional view which shows the internal structure of a side frame. It is a rear view which shows the lever guide. It is a back sectional view which shows the mounting structure of a pin. It is a right side sectional view which shows the front loader in a state where a pin is fitted in a recess. It is an enlarged right side sectional view which shows the state which the pin is fitted in the recess. It is the enlarged right side sectional view which shows the state which the hook is engaged with the boss part.

A mode for carrying out the present invention will be described with reference to the drawings. In the following description, the direction of the arrow F shown in FIGS. 1 and 2 is the “front side of the aircraft”, the direction of the arrow B is the “rear side of the aircraft”, the direction of the arrow L shown in FIG. The direction of R is "the right side of the aircraft".

[Overall configuration of tractor]
1 and 2 show a tractor (corresponding to the "working vehicle" according to the present invention) provided with a front loader 3 with a stand 18. The tractor is provided with an airframe frame 1 and a wheel-type traveling device 2 that supports the airframe frame 1. The traveling device 2 is provided with a pair of left and right front wheels 2F and a pair of left and right rear wheels 2B.

A front loader 3 is provided in front of the machine body. The front loader 3 is detachably attached to the machine body. A mounting frame 1A to which the front loader 3 can be mounted is provided on each of the left side portion and the right side portion of the airframe frame 1. The mounting frame 1A is provided at the lateral outer end of the connecting pipe 1B projecting laterally outward from the fuselage frame 1. A bonnet 4 is provided in the first half of the fuselage frame 1. An engine (not shown) is housed in the bonnet 4.

A driving unit 5 on which the operator is boarded is provided in the latter half of the airframe frame 1. The driver unit 5 is provided with a driver's seat 6 and a front panel 7. The front panel 7 is provided with a steering handle 9.

[Front loader]
The front loader 3 is provided with a pair of left and right booms 11, a pair of left and right side frames 12, and a bucket 13 (corresponding to the "working tool" according to the present invention). The pair of left and right booms 11 extend from the left and right sides of the bonnet 4 to the front position of the machine body, respectively. The pair of left and right booms 11 are connected by a connecting pipe 14 extending in the left-right direction of the machine body.
The boom 11 is swingably supported at the upper end of the side frame 12 around a swing axis X1 extending in the left-right direction of the machine body. A hydraulic cylinder 15 for swinging and driving the boom 11 is provided over the boom 11 and the side frame 12.

The side frame 12 is detachably attached to the attachment frame 1A. On the side frame 12, the end of the hydraulic cylinder 15 on the rod 15A side is called a mount pin 33. ) Is supported. The side frame 12 is provided with a pair of left and right side plates 12A.

The bucket 13 is swingably supported at the free end of the boom 11 around a swing axis X2 extending in the left-right direction of the machine body via a support shaft 16. An outer connecting plate 35 and an inner connecting plate 36 connected to the support shaft 16 are provided on each of the left end portion and the right end portion of the back portion of the bucket 13. The outer connecting plate 35 and the inner connecting plate 36 sandwich the free end portion of the boom 11 from both the left and right sides. A hydraulic cylinder 17 that swings and drives the bucket 13 is provided over the bucket 13 and the connecting pipe 14.

〔stand〕
As shown in FIGS. 2 and 3, the tractor is provided with a stand 18 that supports the front loader 3 so that the front loader 3 can stand on its own when the front loader 3 is attached or detached. The stand 18 swings around the swing axis X2 on the support shaft 16 over a usage posture (see FIG. 4) for supporting the front loader 3 and a storage posture along the longitudinal direction of the boom 11 (see FIG. 3). It is supported as much as possible. That is, the swing axis X2 of the bucket 13 and the swing axis X2 of the stand 18 are set on the same axis.

The stand 18 is provided with a pair of left and right stand bodies 19. The pair of left and right stand bodies 19 are connected by a connection frame 20 extending in the left-right direction of the machine body so as to swing in conjunction with each other. The pair of left and right stand bodies 19 are located inside the left boom 11 and the right boom 11, respectively. The stand 18 does not necessarily have to be on the same axis as the bucket 13, but by using the same axis, it is not necessary to separately provide a rotating shaft portion, and by using a shaft having sufficient strength. , The stand 18 can be made stronger.

The stand body 19 is provided at the intermediate portion in the longitudinal direction so that the distance between the free ends of the pair of left and right stands 19 is longer than the distance between the base ends of the pair of left and right stands 19 in the left-right direction of the machine. It is bent so that the free end side is located on the lateral outer side of the aircraft with respect to the base end side. The free end portion of the stand body 19 overlaps with the boom 11 in a plan view (see FIG. 2). A wide ground contact portion 19a is formed at the free end portion of the stand body 19. According to such a configuration, the front loader 3 can be firmly supported by the stand 18 without wobbling in the left-right direction of the machine body.

[Link mechanism]
A link mechanism 21 is provided over the boom 11 and the stand body 19. The link mechanism 21 is located between the boom 11 and the stand body 19 in the left-right direction of the machine body. The link mechanism 21 is provided with a first link member 22 on the boom 11 side and a second link member 23 on the stand body 19 side. The first link member 22 and the second link member 23 are connected so as to be relatively swingable via a connecting shaft 24. An elongated hole 23a through which the connecting shaft 24 is inserted is formed at the end of the second link member 23 on the first link member 22 side.

[Stand lock mechanism]
A stand lock mechanism 25 is provided that can switch between a locked state in which the stand 18 is held in the retracted posture and an released state in which the locked state is released. In the present embodiment, the stand lock mechanism 25 is provided over the stand body 19 on the left side and the boom 11 on the left side.
The stand lock mechanism 25 includes a pin 26 and a hook 27 that can be engaged with the pin 26. The pin 26 is provided at the free end of the stand body 19 on the left side so as to project laterally and inwardly of the machine body. The hook 27 swings in the laterally inner side of the body of the boom 11 on the left side, extending in the left-right direction of the machine over an engaging position that engages with the pin 26 and a non-engaging position that does not engage with the pin 26. It is supported so as to be swingable around the axis X3. The hook 27 is located in the middle portion in the longitudinal direction of the boom 11 on the left side. Specifically, the hook 27 is located between the portion of the left boom 11 to which the hydraulic cylinder 15 is connected and the portion to which the connection pipe 14 is connected.

[Stand operation lever]
A stand operating lever 28 is provided so as to be manually operable from the driving unit 5 and to switch the stand lock mechanism 25 between the locked state and the released state. The stand operation lever 28 can be switched between a lock position corresponding to the engaging position of the hook 27 and a release position corresponding to the non-engagement position of the hook 27, and can hold the positions at the lock position and the release position, respectively. is there. The stand operating lever 28 is swingably supported around the swing axis X4 extending in the left-right direction of the machine body on the side portion of the left boom 11 on the lateral inside of the machine body. The stand operating lever 28 is located at the free end of the boom 11 on the left side. Specifically, the stand operating lever 28 is located on the rear side of the rotation axis of the front wheel 2F and above the front wheel 2F.

[Interlocking mechanism]
An interlocking mechanism 29 for interlocking the stand lock mechanism 25 and the stand operating lever 28 is provided. The interlocking mechanism 29 is located inside the body of the boom 11 on the left side. The interlocking mechanism 29 is provided with a first arm 30 on the stand operating lever 28 side, a second arm 31 on the hook 27 side, and a linking rod 32 extending over the first arm 30 and the second arm 31. .. The first arm 30 can swing integrally with the stand operating lever 28. The second arm 31 can swing integrally with the hook 27.

[Switching the posture of the stand]
As shown in FIG. 4, the stand 18 is switched to the use posture in order to make the front loader 3 independent in a state where the front loader 3 is not mounted on the machine body. Then, while advancing the machine body, the body side and the front loader 3 side can be connected by a hydraulic hose (not shown), and the front loader 3 can be mounted on the mounting frame 1A. The tractor is provided with a pair of left and right mounting mechanisms 55 for mounting the front loader 3 on the airframe, which will be described in detail later.

Here, at the end of the first link member 22 on the second link member 23 side, a contact portion 22a capable of contacting the second link member 23 is provided. Then, when the stand 18 is in the used posture, the contact portion 22a comes into contact with the second link member 23, so that the second link member 23 is prevented from swinging toward the opening side (direction of arrow A shown in FIG. 4). There is. That is, the link mechanism 21 prevents the stand 18 from swinging toward the storage posture side when the stand 18 is in the used posture. In the state shown in FIG. 4, the first link member 22 and the second link member 23 are opened so that the opening degree α is slightly larger than 180 degrees.

Subsequently, as shown in FIG. 5, the boom 11 is raised to dump the bucket 13 to a position where it abuts on the stand 18.

More specifically, at each of the left end portion and the right end portion of the back portion of the bucket 13, the inner connecting plate 36 is provided with a protrusion 37 projecting laterally and inwardly of the machine body. On the other hand, a recess 19b into which the protrusion 37 enters is formed at the base end of the stand body 19. As a result, the boom 11 is raised, and the bucket 13 is dumped to a position where the protrusion 37 enters the recess 19b and comes into contact with the base end of the stand body 19. In the present embodiment, by providing the recess 19b in the stand body 19, it becomes easy to adjust the swing range of the stand body 19 in accordance with the dump operation of the bucket 13.

Then, when the bucket 13 is further dumped in a state where the protrusion 37 is in contact with the base end of the stand body 19, the stand 18 is in a retracted posture in conjunction with the dumping operation of the bucket 13, as shown in FIG. It is swung to the side.

Here, when the bucket 13 is dumped in the state shown in FIG. 5, the length of the link mechanism 21 is shortened by the amount that the second link member 23 moves along the connecting shaft 24 via the elongated hole 23a. The second link member 23 swings toward the closed side (in the direction opposite to the arrow A shown in FIG. 4). That is, the link mechanism 21 allows the stand 18 to swing toward the storage posture side in conjunction with the dump operation of the bucket 13. Then, when the bucket 13 is dumped to the maximum dump position, the stand 18 is in the state shown in FIG.

Next, as shown in FIG. 7, when the stand operating lever 28 is switched to the lock position, the hook 27 is interlocked with the stand operating lever 28 via the interlocking mechanism 29. As a result, the hook 27 is switched to the engaging position.

At that time, as shown in FIG. 8, as the hook 27 is switched to the engaging position, the stand 18 is slightly lifted by the hook 27 via the pin 26 to a position corresponding to the storage posture. As a result, there is a slight gap between the protrusion 37 and the base end of the stand body 19, and when the stand 18 is in the stowed position, the protrusion 37 and the stand body 19 come into contact with each other during work and rattle. It becomes difficult to do it. In this way, the stand lock mechanism 25 is switched to the locked state by the stand operating lever 28, so that the stand 18 is held in the retracted posture.

Further, the stand 18 can be switched to the working posture by the procedure opposite to the above. That is, as shown in FIG. 7, when the stand operating lever 28 is switched to the release position while the stand 18 is held in the retracted position by the stand lock mechanism 25, the stand lock mechanism 25 is switched to the release state (see FIG. 6). ). As a result, the stand 18 moves slightly downward to a position where the base end portion of the stand body 19 abuts on the protrusion 37.

Then, when the bucket 13 is scooped, the stand 18 is swung toward the usage posture side in conjunction with the scooping operation of the bucket 13 in a state where the protrusion 37 is in contact with the base end portion of the stand body 19. In this way, the stand 18 can be switched to the working posture.

[Bucket mounting frame]
As shown in FIG. 9, a bucket mounting frame 38 is swingably supported around a swing axis X2 extending in the left-right direction of the machine body via a support shaft 16 at the free end portions of the pair of left and right booms 11. ..
A boss portion 11a through which the support shaft 16 is inserted is provided at the free end portion of the boom 11. A bucket 13 is detachably attached to the bucket mounting frame 38. The bucket mounting frame 38 is provided with a pair of left and right frame bodies 39 and a pair of left and right connecting portions 40.

[Bucket lock mechanism]
A pair of left and right bucket lock mechanisms 41 that can switch between a locked state in which the bucket 13 is fixed to the bucket mounting frame 38 and a released state in which the locked state is released are provided on the back of the frame body 39. The bucket lock mechanism 41 is provided with a frame boss member 42, a bucket lock pin 43, and an operation handle 44.

[Frame boss member]
As shown in FIGS. 10 to 12, the frame boss member 42 extends in the vertical direction along the back surface of the frame body 39 in a state where the boom 11 (boss portion 11a) is located laterally outside the machine body with respect to the lateral outer edge of the machine body. ing. The frame boss member 42 is welded and fixed to the frame body 39.

[Bucket lock pin]
The bucket lock pin 43 is attached to the frame boss member 42 over a lock position corresponding to the locked state (position shown by the solid line in FIG. 10) and a release position corresponding to the released state (position shown by the alternate long and short dash line in FIG. 10). It is slidably supported. Lock holes 39a, 13a, 13b through which the bucket lock pin 43 can be inserted are formed in the frame body 39 and the bucket 13.

A link 45 is swingably connected to the upper end of the bucket lock pin 43. A stopper 46 is slidably supported on the link 45. A spring 47 is externally fitted in a portion of the link 45 between the receiving portion 45a and the stopper 46.

[Operation handle]
The operation handle 44 is swingably supported around a swing axis Y1 by a support shaft 39b on the frame body 39 side. One end of the operation handle 44 is bolted to the stopper 46. A handle 44a is formed at the other end of the operation handle 44.

[Frame body]
The frame main body 39 includes a main body 39A extending in the vertical direction along the back surface of the bucket 13, an upper mounting portion 39B formed at the upper end of the frame main body 39 and to which the upper portion of the back of the bucket 13 is attached, and a frame main body. A lower mounting portion 39C, which is formed at the lower end portion of the 39 and to which the lower portion of the back portion of the bucket 13 is mounted, is provided. A vertical plate 48 extending in the vertical direction is welded and fixed to the frame main body 39 over the upper mounting portion 39B and the lower mounting portion 39C.
The vertical plate 48 is located on the lateral side of the machine body with respect to the frame boss member 42.

[Connecting part]
The connecting portion 40 is provided with an outer connecting plate 35 and an inner connecting plate 36. A stopper 51 that can come into contact with the stopper 50 on the boom 11 side is provided over the outer connecting plate 35 and the inner connecting plate 36. During the dump operation of the bucket 13, the stopper 51 on the connecting portion 40 side comes into contact with the stopper 50 on the boom 11 side, so that the bucket 13 is positioned at the most dump position.

The outer connecting plate 35 is connected to a portion of the support shaft 16 that protrudes laterally and outwardly from the boom 11 (boss portion 11a) while being located on the laterally outer side of the body of the boom 11. The outer connecting plate 35 is welded and fixed to the frame boss member 42 and the lower mounting portion 39C in a state where the frame boss member 42 is located laterally inside the machine body with respect to the lateral outer end of the machine body. Specifically, the outer connecting plate 35 is located laterally inside the machine body with respect to the axis Z1 of the frame boss member 42 and laterally outside the machine body with respect to the lateral inner end of the frame boss member 42. That is, the outer connecting plate 35 overlaps with the frame boss member 42 in the rear view (see FIG. 10).

The vertical length of the outer connecting plate 35 is shorter than the vertical length of the inner connecting plate 36. The upper end position of the outer connecting plate 35 is set below the upper end position of the frame boss member 42.

The inner connecting plate 36 is connected to a portion of the support shaft 16 that protrudes laterally and inwardly from the boom 11 (boss portion 11a) while being located inside the body of the boom 11. The inner connecting plate 36 is welded and fixed to the main body portion 39A and the lower mounting portion 39C. The inner connecting plate 36 is provided with a boss portion 36a that supports the support shaft 16. The boss portion 36a projects laterally and inwardly from the inner connecting plate 36.

The inner connecting plate 36 on the left side and the inner connecting plate 36 on the right side are connected by two horizontal frames 52 extending in the left-right direction of the machine body. A support bracket 53 is provided over one horizontal frame 52 and the other horizontal frame 52. The end of the hydraulic cylinder 17 on the rod 17A side is supported by the support bracket 53 via a pin 54.

According to such a configuration, since the outer connecting plate 35 is connected to the frame boss member 42 in a state where the outer connecting plate 35 is located on the lateral inner side of the machine body with respect to the lateral outer end of the frame boss member 42, the outer connecting plate 35 is connected to the frame boss. Compared to the case where the outer connecting plate 35 and the inner connecting plate 36 are located laterally outside the machine 42, the distance between the outer connecting plate 35 and the inner connecting plate 36 in the left-right direction of the machine is narrower, and the length of the support shaft 16 and the outer connecting plate 35 and the inner connecting plate The length of the portion supporting the support shaft 16 (for example, the boss portion 36a) is shortened. As a result, the connection structure between the bucket mounting frame 38 and the boom 11 can be compactly configured, and the strength of the support shaft 16 and the boss portion 36a can be increased. Further, the outer connecting plate 35 is supported by the frame boss member 42 having high rigidity, so that the outer connecting plate 35 can be firmly supported.

[Switching of bucket lock mechanism]
As shown in FIG. 10, when the operation handle 44 is swung to the position shown by the solid line in FIG. 10, the bucket lock pin 43 moves downward along the frame boss member 42, and the lock hole 39a on the frame body 39 side is used. , It is inserted into the lock holes 13a and 13b on the bucket 13 side. At that time, the first contact portion 44b of the operation handle 44 comes into contact with the vertical plate 48, so that the operation handle 44 does not swing any more. Then, the operation handle 44 is held in a state where the first contact portion 44b is in contact with the vertical plate 48 by the urging force of the spring 47. In this way, the bucket lock mechanism 41 can be switched to the locked state.

Then, when the operation handle 44 is swung to the position shown by the alternate long and short dash line in FIG. 10, the bucket lock pin 43 swings upward along the frame boss member 42, and the lock hole 39a on the frame body 39 side and the bucket It comes out from the lock holes 13a and 13b on the 13 side. At that time, the second contact portion 44c of the operation handle 44 comes into contact with the vertical plate 48, so that the operation handle 44 does not swing any more. In this way, the bucket lock mechanism 41 can be switched to the released state.

[Mounting mechanism for front loader]
As shown in FIGS. 13 and 14, the mounting mechanism 55 is provided with a mounting frame boss portion 56 (corresponding to the “engaged member” according to the present invention) provided on the mounting frame 1A and a side frame 12. , A hook 57 that can be engaged with the mounting frame boss portion 56 (corresponding to the "engaging member" according to the present invention) and a stopper 58 that is provided on the side frame 12 and can support the mounting frame boss portion 56 (in the present invention). Corresponding to the "support member") and.

[Mounting frame boss]
The mounting frame boss portion 56 is provided at the upper end portion of the mounting frame 1A so as to penetrate the mounting frame 1A in the left-right direction of the machine body. The left end portion and the right end portion of the mounting frame boss portion 56 project to the left and right from the mounting frame 1A, respectively.

〔hook〕
The hook 57 has an engaging position (position shown by the solid line in FIG. 14) that engages with the mounting frame boss portion 56 and a non-engaging position (position indicated by the alternate long and short dash line in FIG. It is possible to switch to. The hook 57 is swingably supported by the side frame 12 via a mount pin 33 around a swing axis X5 extending in the left-right direction of the machine body. The hook 57 is housed inside the side frame 12. Specifically, the hook 57 is arranged between the pair of left and right side plates 12A.

The hook 57 is provided with a pair of left and right hook bodies 57A. The pair of left and right hook bodies 57A are connected by connecting bodies 61 and 62 so as to swing in conjunction with each other. The pair of left and right hook bodies 57A are located on the left side and the right side of the end portion of the hydraulic cylinder 15 on the rod 15A side, respectively. The hook body 57A on the left side can be engaged with a portion of the mounting frame boss portion 56 that protrudes to the left from the mounting frame 1A. The hook body 57A on the right side can be engaged with a portion of the mounting frame boss portion 56 that protrudes to the left from the mounting frame 1A.

〔stopper〕
The stopper 58 is provided with a pair of left and right stopper bodies 58A. The pair of left and right stopper bodies 58A are welded and fixed to the inner surfaces of the pair of left and right side plates 12A, respectively.
The stopper 58 is connected to a pin 59 provided at the lower end of the side frame 12 by a connecting plate 60.

The stopper body 58A has a receiving portion 58a that receives and supports the mounting frame boss portion 56, and an inlet portion 58b that is formed on the opposite side (tip side) of the stopper body 58A from the receiving portion 58a and receives the mounting frame boss portion 56. And are provided. The receiving portion 58a is formed with an arc-shaped recess 58c that follows the outer peripheral shape of the mounting frame boss portion 56. The inlet portion 58b is tapered so that the distance between the pair of left and right stopper bodies 58A becomes wider as it approaches the tip thereof. As a result, the frontage (distance between the pair of left and right stopper bodies 58A) for the pair of left and right stopper bodies 58A to receive the mounting frame boss portion 56 becomes wide.

[Hook operation lever]
A hook operating lever 63 (corresponding to the "operating member" according to the present invention), which is configured to be manually operable from the driving unit 5 and switches the hook 57 between the engaged position and the non-engaged position, is provided.
The hook operating lever 63 is composed of an elastically deformable plate-shaped member. The hook operating lever 63 is connected to the connecting body 62. The hook operating lever 63 is housed inside the side frame 12. Specifically, the hook operation lever 63 is arranged between the pair of left and right side plates 12A.

As shown in FIG. 15, the side frame 12 is provided with a lever guide 64 for the hook operation lever 63. The lever guide 64 is composed of a plate-shaped member that is appropriately bent. The lever guide 64 is formed with a guide groove 64A for guiding the hook operation lever 63. The guide groove 64A includes an engagement positioning portion 64a for positioning the hook operation lever 63 at the engagement operation position corresponding to the engagement position of the hook 57, and a non-engagement positioning portion 64a for positioning the hook operation lever 63 at the non-engagement position corresponding to the non-engagement position of the hook 57. A non-engagement positioning portion 64b for positioning at the engagement operation position and an oblique guide portion 64c extending between the engagement positioning portion 64a and the non-engagement positioning portion 64b are provided. The non-engagement positioning portion 64b is provided with a holding portion 64d for hooking the hook operation lever 63 and holding the hook operation lever 63 at the non-engagement operation position.

[Mount pin mounting structure]
As shown in FIG. 16, a fixing plate 65 is welded and fixed to a portion of the mount pin 33 that protrudes laterally and outwardly from the side frame 12. By fixing the fixing plate 65 to the fixed plate 66 on the side frame 12 side by bolts 67, the mount pin 33 is prevented from rotating and coming off.

The fixed plate 66 is formed with an insertion hole 66a into which the mount pin 33 is inserted. A chamfered portion 66b is formed in a portion of the fixed plate 66 corresponding to the laterally outer end of the insertion hole 66a. The chamfered portion 66b accommodates an O-ring 68 fitted to the mount pin 33. As a result, even if the grease lubricated from the grease nipple 70 provided at the end of the hydraulic cylinder 15 on the rod 15A side tries to leak from between the mount pin 33 and the fixed plate 66 to the lateral side of the machine body, The O-ring 68 can prevent the grease from leaking out.

[Installation of front loader]
As shown in FIG. 17, from the state where the front loader 3 is supported by the stand 18 (the state shown in FIG. 4), the bucket 13 is dumped, and the pin 59 on the side frame 12 side is attached to the recess 69 on the mounting frame 1A side. Fit into. Then, as shown in FIG. 18, the mounting frame boss portion 56 is located at the inlet portion 58b of the stopper 58 and comes into contact with the hook 57, and the hook 57 swings from the engaged position to the non-engaged position side. As it moves, the hook operating lever 63 elastically deforms and swings to an intermediate position on the oblique guide portion 64c in the guide groove 64A.

Then, as shown in FIG. 19, when the side frame 12 is placed in a vertical position, the hook 57 engages with the mounting frame boss portion 56. More specifically, the mounting frame boss portion 56 is fitted into the recess 58c of the stopper 58 and is received and supported by the receiving portion 58a, and the mounting frame boss portion 56 is received and supported by the receiving portion 58a of the stopper 58. , The hook 57 engages with the mounting frame boss portion 56. At that time, the hook operation lever 63 swings toward the engagement operation position side along the diagonal guide portion 64c in the guide groove 64A while being restored to the original shape, and is positioned at the engagement operation position. In this way, the front loader 3 can be mounted on the machine body by engaging the hook 57 with the mounting frame boss portion 56.

Further, in order to remove the front loader 3 from the machine body, the hook operation lever 63 is switched from the driving unit 5 to the non-engagement operation position, and the hook operation lever 63 is hooked on the holding portion 64d of the guide groove 64A to perform the non-engagement operation. Hold in position. As a result, the hook 57 is switched to the non-engaged position, and the front loader 3 can be removed from the machine body.

According to such a configuration, the front loader 3 can be easily mounted on the machine body only by engaging the hook 57 with the mounting frame boss portion 56. That is, the front loader 3 can be attached to the machine body without using pins, bolts, or the like, and the front loader 3 can be easily attached to and detached from the machine body.

[Another Embodiment]
(1) In the above embodiment, the "engaged member" according to the present invention is composed of the mounting frame boss portion 56, but may be composed of, for example, a solid round bar member.

(2) In the above embodiment, the hook operating lever 63 is housed inside the side frame 12, but the hook operating lever 63 can be provided at any place as long as it can be artificially operated from the driving unit 5. ..

(3) In the above embodiment, the "operation member" according to the present invention is composed of a hook operation lever 63 that can be manually operated from the operation unit 5, but may be composed of an operation pedal. Further, the "operating member" may be one that can be automatically operated. Alternatively, the "operating member" may not be provided. In this case, the hook 57 is directly or automatically switched between the engaged position and the non-engaged position.

(4) A guide portion for guiding the mounting frame boss portion 56 to the stopper 58 may be provided on the mounting frame boss portion 56 or the stopper 58.

(5) In the above embodiment, the "working tool" according to the present invention is composed of the bucket 13, but the "working tool" is not limited to the bucket 13.

The present invention can be used not only for a work vehicle without a cabin but also for a work vehicle with a cabin.

3 Front loader 5 Driving unit 11 Boom 12 Side frame 13 Bucket (working tool)
55 Mounting mechanism 56 Mounting frame Boss (engaged member)
57 Hook (engagement member)
58 Stopper (support member)
63 Hook operation lever (operation member)
X1 swing axis

Claims (7)

A front loader that can be attached to and detached from the aircraft,
A mounting mechanism for mounting the front loader on the airframe is provided.
The mounting mechanism is provided with an engaged member provided on the machine body and an engaging member provided on the front loader and capable of engaging with the engaged member.
In the mounting mechanism, the front loader is mounted on the airframe by engaging the engaging member with the engaged member from above .
A pair of left and right booms that support work tools and left and right boom base ends that are swingably supported around the swing axis extending in the left-right direction of the machine and detachably attached to the machine are attached to the front loader. It is equipped with a pair of side frames,
The operating member that switches the engaging member between the engaging position that engages with the engaged member and the non-engaging position that does not engage with the engaged member is an outer portion of the side frame in the body width direction. work vehicle that has been provided on the inner side than. The mounting mechanism is provided with a support member provided on the front loader and capable of supporting the engaged member.
The work vehicle according to claim 1, wherein the engaging member engages with the engaged member in a state where the engaged member is supported by the supporting member. The work vehicle according to claim 1 or 2, wherein the engaging member is a hook, the engaged member is a boss portion, and the hook engages with the boss portion from above. A pin is provided in a portion of the front loader below the hook.
A recess that opens upward is provided in a portion of the machine body below the boss portion.
The work vehicle according to claim 3, wherein the front loader is mounted on the machine body by engaging the hook with the boss portion in a state where the pin is fitted in the recess. The work vehicle according to claim 3 or 4, wherein the swing fulcrum of the hook is located on the front side in the front-rear direction of the machine body with respect to the boss portion in a state where the hook is engaged with the boss portion. The work vehicle according to any one of claims 1 to 5, wherein the operation member is housed inside the side frame and can be artificially operated from a driving unit on which an operator is boarded. It is a front loader that can be attached to and detached from the aircraft.
A mounting mechanism for mounting the front loader on the airframe is provided.
The mounting mechanism is provided with an engaging member that can be engaged with the engaged member on the machine body side.
In the mounting mechanism, the front loader is mounted on the airframe by engaging the engaging member with the engaged member from above .
A pair of left and right booms that support the work tool, and a pair of left and right side frames that swingably support the base end of the boom around the swing axis extending in the left-right direction of the machine and are detachably attached to the machine. , Is provided,
The operating member that switches the engaging member between the engaging position that engages with the engaged member and the non-engaging position that does not engage with the engaged member is an outer portion of the side frame in the body width direction. front loader that has been provided on the inner side than.

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