JP6552399B2 - Work vehicle and front loader - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a front loader detachable from an airframe and a work vehicle provided with the same.

  As a working vehicle as described above, for example, a working vehicle described in Patent Document 1 is already known. The work vehicle described in Patent Document 1 includes 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 hole on the front loader side and the mounting pin hole on the machine body side.

JP, 2014-5690, A

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

  In view of the above situation, a front loader that can be easily attached to and detached from the machine body and a work vehicle including the same are desired.

The feature of the present invention is that
A front loader that can be attached to and removed from the machine,
And a mounting mechanism for mounting the front loader to the machine body,
The mounting mechanism includes an engaged member provided on the machine body, and an engagement member provided on the front loader and engageable with the engaged member.
The mounting mechanism mounts the front loader on the machine body by engaging the engaging member with the engaged member ,
An operating member is provided for switching the engagement member between an engagement position in which the engagement member is engaged and a non-engagement position in which the engagement member is not engaged.
A pair of left and right booms that support the work tool, and a left and right boom that supports the base end portion of the boom so as to be swingable around a swing axis that extends in the left-right direction of the machine body and is detachably attached to the machine body. A pair of side frames,
The operation member is housed inside the side frame and can be manually operated from a driving unit on which an operator gets on .

According to this feature configuration, the front loader can be easily mounted to the machine only by engaging the engaging member with the engaged member. That is, the front loader can be attached to the machine without using pins or bolts, and the front loader can be easily attached to and detached from the machine.
According to this characteristic configuration, the engaging member can be easily switched between the engaging position and the engaged position by the operation member.
According to this feature configuration, the engaging member can be easily switched between the engaged position and the engaged position by manually operating the operation member from the operation unit without the operator getting off the operation unit.

Furthermore, in the present invention,
The mounting mechanism includes a support member provided on the front loader and capable of supporting the engaged member,
The engagement member is preferably engaged with the engaged member in a state where the engaged member is supported by the support member.

  According to this characteristic configuration, the engaging member is engaged with the engaged member while the engaged member is supported by the support member. Thereby, the engagement member firmly engages with the engaged member.

The feature of the present invention is that
A front loader that can be attached to and removed from the machine
An attachment mechanism for attaching the front loader to the machine body;
The mounting mechanism is provided with an engaging member that can be engaged with an engaged member on the airframe side,
The mounting mechanism mounts the front loader on the machine body by engaging the engaging member with the engaged member ,
An operation member that switches the engagement member between an engagement position that engages the engaged member and a non-engagement position that does not engage the engaged member;
A pair of left and right booms that support the work implement;
A pair of left and right side frames that support the base end of the boom so as to be swingable around a swing axis extending in the left-right direction of the machine body and detachably attached to the machine body,
The operation member is housed in the side frame and can be manually operated from a driving unit on which the operator is boarded .

According to this feature configuration, the front loader can be easily mounted to the machine only by engaging the engaging member with the engaged member. That is, the front loader can be attached to the machine without using pins or bolts, and the front loader can be easily attached to and detached from the machine.
According to this characteristic configuration, the engaging member can be easily switched between the engaging position and the engaged position by the operation member.
According to this feature configuration, the engaging member can be easily switched between the engaged position and the engaged position by manually operating the operation member from the operation unit without the operator getting off the operation unit.

It is a right side view showing a tractor. It is a top view which shows the front part of a tractor. It is a right side sectional view showing the front loader in the state where it was equipped to the body. FIG. 6 is a right side cross-sectional view showing the front loader supported by the stand. FIG. 6 is a right side sectional view showing the front loader in a state in which the boom is raised and the bucket is dumped to a position where the bucket abuts on the stand. It is a right side sectional view showing the front loader in a state where the bucket is dumped to the maximum dump position. It is right side surface sectional drawing which shows the front loader of the state which accommodated the stand. It is a right view which shows an interlocking mechanism. It is a rear view which shows the state in which the bucket was attached to the attachment frame. It is a rear view which shows a locking mechanism and a connection part. It is right side sectional drawing which shows a locking mechanism and a connection part. It is sectional drawing which shows a locking mechanism and a connection part. It is an exploded perspective view showing a mounting mechanism. It is right side sectional drawing which shows the internal structure of a side frame. It is a rear view showing a lever guide. It is a back sectional view showing the attachment structure of a pin. It is right side sectional drawing which shows the front loader of the state in which the pin was engage | inserted by the recessed part. FIG. 7 is an enlarged right side cross-sectional view showing a state in which a pin is fitted into a recess. It is an expansion right side sectional view showing the state where the hook engaged with the boss.

  EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated based on drawing. In the following description, the direction of arrow F shown in FIGS. 1 and 2 is "front side of the machine", the direction of arrow B is "rear side of the machine", the direction of arrow L shown in FIG. 2 is "left side of the machine", arrow Let the direction of R be the “right side of the aircraft”.

[Overall structure of tractor]
1 and 2 show a tractor (corresponding to a "working vehicle" according to the present invention) provided with a front loader 3 with a stand 18. The tractor is provided with a machine body frame 1 and a wheel-type traveling device 2 for supporting the machine body 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 airframe. The front loader 3 is detachably mounted to the machine body. On each of the left side portion and the right side portion of the machine body frame 1, a mounting frame 1A to which the front loader 3 can be mounted is provided. The mounting frame 1 </ b> A is provided at the machine body lateral outer end portion of the connection pipe 1 </ b> B projecting from the machine frame 1 to the machine body laterally outward. A bonnet 4 is provided in the front half of the body frame 1. An engine (not shown) is accommodated in the bonnet 4.

  In the latter half of the machine body frame 1, an operation unit 5 on which an operator gets on is provided. The driver 5 is provided with a driver's seat 6 and a front panel 7. A steering handle 9 is provided on the front panel 7.

[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 a "work 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 positions in front of the aircraft. The pair of left and right booms 11 are connected by a connection pipe 14 extending in the left-right direction of the machine body. The boom 11 is swingably supported at an upper end portion of the side frame 12 around a swing axis X1 extending in the left-right direction of the vehicle body. A hydraulic cylinder 15 that swings and drives the boom 11 is provided across the boom 11 and the side frame 12.

  The side frame 12 is detachably attached to the mounting frame 1A. In the side frame 12, the end of the hydraulic cylinder 15 on the rod 15 </ b> A side is called a mount pin 33. Is supported via). The side frame 12 is provided with a pair of left and right side plates 12A.

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

〔stand〕
As shown in FIGS. 2 and 3, the present tractor is provided with a stand 18 for supporting the front loader 3 in order to make the front loader 3 stand by itself when the front loader 3 is attached and detached. The stand 18 swings around the swing axis X2 on the support shaft 16 over the use posture (see FIG. 4) for supporting the front loader 3 and the storage posture (see FIG. 3) along the longitudinal direction of the boom 11. Supported 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 on the inner side of 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. However, by using the same axis, not only it is not necessary to separately provide a rotary shaft portion, but by using an axis having sufficient strength. The stand 18 can be made stronger.

  The stand body 19 is at the longitudinal middle portion so that the distance between the free ends of the pair of left and right stand bodies 19 is longer than the distance between the base ends of the pair of left and right stand bodies 19 in the left-right direction of the machine body. The free end portion is bent so that the free end portion side is located on the laterally outer side with respect to the base end portion side. The free end of the stand body 19 overlaps the boom 11 in plan view (see FIG. 2). A wide-width grounding portion 19 a 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 being shaken in the lateral direction of the machine.

[Link mechanism]
A link mechanism 21 is provided across 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 to each other via a connecting shaft 24 so as to be relatively swingable. The end of the second link member 23 on the first link member 22 side is formed with a long hole 23 a through which the connecting shaft 24 is inserted.

[Stand lock mechanism]
A stand lock mechanism 25 is provided which can be switched between a locked state in which the stand 18 is held in the stored position and a released state in which the locked state is released. In the present embodiment, the stand lock mechanism 25 is provided across 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 a free end portion of the left stand body 19 so as to protrude inwardly from the aircraft body. The hook 27 swings on the side of the left side boom 11 on the inner side of the body, extending in the left-right direction of the body over an engagement position where the pin 26 is engaged and a non-engagement position where the pin 26 is not engaged. It is swingably supported around the axis X3. The hook 27 is located at the longitudinal middle of the boom 11 on the left side. Specifically, the hook 27 is located between the portion of the boom 11 on the left side to which the hydraulic cylinder 15 is connected and the portion to which the connection pipe 14 is connected.

[Stand control lever]
A stand operation lever 28 that is configured to be manually operable from the operation unit 5 and that switches the stand lock mechanism 25 between a locked state and a released state is provided. The stand operation lever 28 can be switched between a lock position corresponding to the engagement position of the hook 27 and a release position corresponding to the non-engagement position of the hook 27, and can be held at the lock position and the release position, respectively. is there. The stand operating lever 28 is supported on the side of the left side boom 11 on the laterally inner side of the body so as to be swingable about a swing axis X4 extending in the left-right direction of the body. The stand control lever 28 is located at the free end of the boom 11 on the left side. Specifically, the stand operation lever 28 is positioned above the front wheel 2F on the rear side of the rotational axis of the front wheel 2F.

[Interlocking mechanism]
An interlocking mechanism 29 that interlocks and links the stand lock mechanism 25 and the stand operation lever 28 is provided. The interlocking mechanism 29 is located laterally inward of the left boom 11. The interlock mechanism 29 includes a first arm 30 on the stand operation lever 28 side, a second arm 31 on the hook 27 side, and a linkage rod 32 that extends between the first arm 30 and the second arm 31. . The first arm 30 can be pivoted integrally with the stand control lever 28. The second arm 31 is swingable integrally with the hook 27.

[Switching stand posture]
As shown in FIG. 4, in a state where the front loader 3 is not attached to the machine body, the stand 18 is switched to the use posture in order to make the front loader 3 stand by itself. Then, while moving the machine forward, the machine 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 present tractor is provided with a pair of left and right attachment mechanisms 55 for attaching the front loader 3 to the machine body, which will be described in detail later.

  Here, at an end of the first link member 22 on the second link member 23 side, an abutting portion 22 a that can abut on the second link member 23 is provided. Then, when the stand 18 is in the use posture, the abutment portion 22a abuts on the second link member 23, thereby preventing the second link member 23 from swinging to the open side (the direction of the arrow A shown in FIG. 4). There is. That is, the link mechanism 21 prevents the stand 18 from swinging toward the storage posture when the stand 18 is in the use posture. In the state shown in FIG. 4, the first link member 22 and the second link member 23 are opened such that the opening degree α is slightly larger than 180 degrees.

  Subsequently, as shown in FIG. 5, the boom 11 is raised and the bucket 13 is dumped to a position where it comes into contact with the stand 18.

  More specifically, in each of the left end portion and the right end portion of the back portion of the bucket 13, the inner connection plate 36 is provided with a projection 37 which protrudes inward in the lateral direction of the machine. On the other hand, at the base end of the stand body 19, a recess 19b into which the protrusion 37 is inserted is formed. As a result, the boom 11 is raised, and the bucket 13 is dumped to a position where the projection 37 enters the recess 19 b and abuts on the base end of the stand 19. In the present embodiment, by providing the recess 19 b in the stand 19, adjustment of the swing range of the stand 19 adapted to the dumping operation of the bucket 13 is facilitated.

  Then, when the bucket 13 is further dumped with the projection 37 in contact with the base end of the stand 19, as shown in FIG. It swings to the side.

  Here, in the state shown in FIG. 5, when the bucket 13 is dumped, the length of the link mechanism 21 is shortened by the amount by which the second link member 23 moves along the connecting shaft 24 via the long hole 23a. Thus, the second link member 23 swings toward the closing side (the direction opposite to the arrow A shown in FIG. 4). That is, the link mechanism 21 allows the stand 18 to swing to the storage posture side in conjunction with the dumping operation of the bucket 13. Then, when the bucket 13 is dumped to the full 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 interlocks with the stand operating lever 28 via the interlocking mechanism 29. Thereby, the hook 27 is switched to the engagement position.

  At this time, as shown in FIG. 8, as the hook 27 is switched to the engaged 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 projection 37 and the base end of the stand 19, and when the stand 18 is in the storage posture, the projection 37 and the stand 19 come into contact and rattle during work. It becomes difficult to fight. Thus, the stand lock mechanism 25 is switched to the locked state by the stand operation lever 28 to hold the stand 18 in the storage posture.

  Further, the stand 18 can be switched to the use posture by a 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 storage posture by the stand lock mechanism 25, the stand lock mechanism 25 is switched to the release state (see FIG. 6). ). Thus, the stand 18 is slightly moved downward to a position where the base end of the stand 19 abuts on the projection 37.

  Then, when the bucket 13 is operated to crawl, the stand 18 is swung to the use posture side in conjunction with the operation of crawling the bucket 13 in a state where the projection 37 abuts on the base end of the stand 19. Thus, the stand 18 can be switched to the use posture.

[Bucket mounting frame]
As shown in FIG. 9, a bucket mounting frame 38 is supported on the free ends of the pair of left and right booms 11 so as to be swingable about a swing axis X <b> 2 extending in the left-right direction of the machine body via the support shaft 16. . A boss portion 11 a through which the support shaft 16 is inserted is provided at the free end portion of the boom 11. The bucket 13 is detachably attached to the bucket attachment 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 be switched between a locked state for fixing the bucket 13 to the bucket mounting frame 38 and a released state for releasing the locked state is provided on the back of the frame main body 39. The bucket lock mechanism 41 includes 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 rear surface of the frame body 39 in a state of being located on the laterally outer side of the body with respect to the laterally outer end of the body of the boom 11 (boss portion 11 a). ing. The frame boss member 42 is fixed to the frame body 39 by welding.

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

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

[Operation handle]
The operation handle 44 is supported by a support shaft 39b on the frame body 39 side so as to be swingable around the swing axis Y1. One end of the operation handle 44 is bolted to the stopper 46. At the other end of the operation handle 44, a handle 44a is formed.

[Frame body]
The frame main body 39 has a main body portion 39A extending in the vertical direction along the back surface of the bucket 13; an upper mounting portion 39B formed at the upper end portion of the frame main body 39 and to which the upper portion of the back portion of the bucket 13 is attached; And a lower mounting portion 39 </ b> C to which a lower portion of the back portion of the bucket 13 is attached. A longitudinal plate 48 extending in the longitudinal direction is fixed by welding to the frame main body 39 so as to extend over the upper attachment portion 39B and the lower attachment portion 39C. The longitudinal plate 48 is located laterally outside 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 capable of coming into contact with the stopper 50 on the boom 11 side is provided across the outer connecting plate 35 and the inner connecting plate 36. During the dumping operation of the bucket 13, the stopper 51 on the connection portion 40 side abuts against the stopper 50 on the boom 11 side, whereby the bucket 13 is positioned at the dumping most position.

  The outer connection plate 35 is connected to a portion of the support shaft 16 which protrudes outward in the lateral direction of the machine from the boom 11 (the boss portion 11a) in a state where the outer connection plate 35 is positioned on the lateral side of the boom 11 in the lateral direction. The outer connection plate 35 is welded and fixed to the frame boss member 42 and the lower attachment portion 39C in a state where the outer connection plate 35 is positioned on the inner side of the body of the frame boss member 42 in the lateral direction. Specifically, the outer connecting plate 35 is located laterally inward of the axial center Z1 of the frame boss member 42 and laterally outward of the inboard end of the frame boss member 42. That is, the outer connecting plate 35 overlaps the frame boss member 42 in a rear view (see FIG. 10).

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

  The inner connection plate 36 is connected to a portion of the support shaft 16 that protrudes inward in the lateral direction of the machine from the boom 11 (the boss portion 11 a) in a state where the inner connection plate 36 is positioned inward of the boom 11 in the lateral direction. 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 36 a that supports the support shaft 16. The boss portion 36 a protrudes laterally inward from the inner connecting plate 36.

  The left inner connecting plate 36 and the right inner connecting plate 36 are connected by two horizontal frames 52 extending in the left-right direction of the machine body. A support bracket 53 is provided across one horizontal frame 52 and the other horizontal frame 52. An 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 positioned on the inner side of the body of the frame boss member 42 in the lateral side of the machine, the outer connecting plate 35 is a frame boss Compared with the case where the outer connecting plate 35 and the inner connecting plate 36 are located laterally outside the member 42, the distance between the outer connecting plate 35 and the inner connecting plate 36 in the left-right direction of the fuselage is reduced. The length of the portion (for example, the boss portion 36a) that supports the support shaft 16 is shortened. Thus, the connection structure between the bucket mounting frame 38 and the boom 11 can be made compact, and the strength of the support shaft 16 and the boss 36a can be increased. In addition, the outer connecting plate 35 is supported by the rigid frame boss member 42, so that the outer connecting plate 35 can be firmly supported.

[Change 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 main body 39 side. The lock holes 13a and 13b on the side of the bucket 13 are inserted. At this time, when the first contact portion 44b of the operation handle 44 abuts on the vertical plate 48, the operation handle 44 does not swing further. Then, the operating handle 44 is held in a state in which the first contact portion 44 b is in contact with the vertical plate 48 by the biasing force of the spring 47. Thus, the bucket lock mechanism 41 can be switched to the locked state.

  Then, when the operation handle 44 is swung to the position indicated by the two-dot chain 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 main body 39 side, the bucket The lock holes 13a and 13b on the 13th side come out. At this time, when the second contact portion 44c of the operation handle 44 abuts on the vertical plate 48, the operation handle 44 does not swing further. Thus, 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 the side frame 12 , A hook 57 (corresponding to an “engagement member” according to the present invention) that can be engaged with the mounting frame boss portion 56, and a stopper 58 that is provided on the side frame 12 and can support the mounting frame boss portion 56 (according to the present invention). (Corresponding to the “support member”).

[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 body. The left end portion and the right end portion of the attachment frame boss portion 56 protrude leftward and rightward from the attachment frame 1A, respectively.

〔hook〕
The hook 57 engages with the attachment frame boss portion 56 (a position indicated by a solid line in FIG. 14) and a non-engagement position not engaged with the attachment frame boss portion 56 (a position indicated by a two-dot chain line in FIG. 14). And can be switched. The hook 57 is swingably supported by the side frame 12 via the mount pin 33 around a swing axis X5 extending in the left-right direction of the machine. The hooks 57 are accommodated inside the side frame 12. Specifically, the hook 57 is disposed 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 and right sides of the end of the hydraulic cylinder 15 on the rod 15A side, respectively. The left hook body 57A can engage with a portion of the attachment frame boss portion 56 that protrudes leftward from the attachment frame 1A. The right hook body 57A is engageable with a portion of the attachment frame boss portion 56 that protrudes leftward from the attachment 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 fixed by welding to the inner surfaces of the pair of left and right side plates 12A. The stopper 58 is connected to a pin 59 provided at the lower end of the side frame 12 by a connection plate 60.

  The stopper body 58A has a receiving portion 58a for receiving and supporting the mounting frame boss portion 56, and an inlet portion 58b formed on the opposite side (tip end side) of the stopper body 58A to the receiving portion 58a and receiving the mounting frame boss portion 56. And are equipped. The receiving portion 58 a is formed with an arc-shaped recessed portion 58 c which 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 larger as it approaches the tip. As a result, the space between the pair of left and right stopper bodies 58A for receiving the mounting frame bosses 56 (the interval between the pair of left and right stopper bodies 58A) becomes wide.

[Hook control lever]
A hook operating lever 63 (corresponding to the “operation member” according to the present invention) is configured to be manually operable from the operation unit 5 and to switch the hook 57 between the engaged position and the non-engaged position. The hook control lever 63 is formed of an elastically deformable plate-like member. The hook control lever 63 is connected to the connector 62. The hook control lever 63 is accommodated inside the side frame 12. Specifically, the hook operation lever 63 is disposed 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 constituted by a plate-like member which is appropriately bent. The lever guide 64 is formed with a guide groove 64 </ b> A for guiding the hook operation lever 63. In the guide groove 64A, an engagement positioning portion 64a for positioning the hook operation lever 63 at an engagement operation position corresponding to the engagement position of the hook 57, and a non-engagement position corresponding to the non-engagement position of the hook operation lever 63. A non-engaging positioning portion 64b positioned at the engaging operation position, and an oblique guide portion 64c extending between the engaging positioning portion 64a and the non-engaging positioning portion 64b are provided. The non-engaging positioning portion 64b is provided with a holding portion 64d that hooks the hook operation lever 63 and holds it at the non-engaging 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 which protrudes outward in the lateral direction of the machine from the side frame 12. The fixing plate 65 is fixed to the fixed plate 66 on the side of the side frame 12 by a bolt 67 to prevent the mounting pin 33 from rotating and coming off.

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

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

  Then, as shown in FIG. 19, when the side frame 12 is in the vertical posture, the hooks 57 engage with the mounting frame bosses 56. More specifically, the mounting frame boss 56 is fitted into the recess 58c of the stopper 58 and supported by the receiving portion 58a, and the mounting frame boss 56 is supported by the receiving portion 58a of the stopper 58. The hooks 57 engage with the mounting frame bosses 56. At that time, while the hook operating lever 63 is restored to the original shape, it is swung to the engagement operation position side along the oblique guide portion 64c of the guide groove 64A and is positioned at the engagement operation position. Thus, the front loader 3 can be mounted on the machine body by the hook 57 engaging with the attachment 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 operation 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 Hold in position. As a result, the hooks 57 are switched to the non-engaging position, and the front loader 3 can be removed from the machine.

  According to such a configuration, the front loader 3 can be easily mounted to the machine only by engaging the hooks 57 with the mounting frame bosses 56. That is, the front loader 3 can be easily attached to and detached from the machine by attaching the front loader 3 to the machine without using pins and bolts.

[Another embodiment]
(1) In the above-mentioned embodiment, although the "engaged member" concerning the present invention is constituted by attachment frame boss part 56, it may be constituted by a solid round bar member, for example.

(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 manually operated from the driving unit 5 .

(3) In the above-mentioned embodiment, although the "operation member" concerning the present invention is constituted by hook operation lever 63 which can be manually operated from operation part 5, it may be constituted by an operation pedal. Also, the "operation member" may be automatically operable. Alternatively, the “operation member” may not be provided. In this case, the hooks 57 are directly switched manually or automatically between the engaged position and the non-engaged position.

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

(5) In the said embodiment, although the "work tool" which concerns on this invention is comprised by the bucket 13, the same "work tool" is not limited to the bucket 13. FIG.

  The present invention is applicable to work vehicles with a cabin as well as work vehicles without a cabin.

3 front loader 5 operation part 11 boom 12 side frame 13 bucket (workpiece)
55 Mounting mechanism 56 Mounting frame boss (engaged member)
57 Hook (engaging member)
58 Stopper (support member)
63 Hook operation lever (operation member)
X1 Oscillation axis

Claims (3)

A front loader that can be attached to and detached from the aircraft,
And a mounting mechanism for mounting the front loader to the machine body,
The mounting mechanism includes an engaged member provided on the machine body, and an engagement member provided on the front loader and engageable with the engaged member.
The mounting mechanism mounts the front loader on the machine body by engaging the engaging member with the engaged member ,
An operating member is provided for switching the engagement member between an engagement position in which the engagement member is engaged and a non-engagement position in which the engagement member is not engaged.
A pair of left and right booms that support the work tool, and a left and right boom that supports the base end portion of the boom so as to be swingable around a swing axis that extends in the left-right direction of the machine body and is detachably attached to the machine body. There is a pair of side frames,
The operation member is housed inside the side frame, and is a work vehicle that can be manually operated from a driving unit on which an operator is boarded . The mounting mechanism includes a support member provided on the front loader and capable of supporting the engaged member,
The work vehicle according to claim 1, wherein the engagement member engages with the engaged member in a state where the engaged member is supported by the support member. A front loader that can be attached to and removed from the machine
An attachment mechanism for attaching the front loader to the machine body;
The mounting mechanism is provided with an engaging member that can be engaged with an engaged member on the airframe side,
The mounting mechanism mounts the front loader on the machine body by engaging the engaging member with the engaged member ,
An operation member for switching the engagement member between an engagement position in which the engagement member is engaged and a non-engagement position in which the engagement member is not engaged with the engagement member;
A pair of left and right booms that support the work tools,
The left and right side frames are supported so as to support the proximal end of the boom pivotally about a pivot axis extending in the left-right direction of the machine and removably attached to the machine.
The front loader which is accommodated in the inside of the side frame, and which can operate the operation member manually from an operation unit on which an operator gets on the machine .

Images