JP4357430B2 - Loader working machine - Google Patents

Description

  The present invention relates to a loader working machine such as a front loader attached to a front portion of a traveling vehicle body such as a tractor.

Conventionally, a loader work machine includes a main frame attached to a traveling vehicle body and a side frame that supports a boom, and a boss portion is provided on each of the main frame and the side frame, and the side frame swings with respect to the main frame. One of the main frame or the side frame is movably engaged so as to regulate the swing of the side frame relative to the main frame at the swing position of the side frame where the boss portion of the main frame coincides with the boss portion of the side frame. In addition, a stopper that comes into contact with the other boss portion is provided, and the side frame is detachably fixed to the main frame by inserting a mount pin through the matched boss portion into the main frame and the side frame. In this type of conventional loader work machine, the boss part and the stop are Constitute the over to separate members, and a boss portion and the stopper on one of the main frame or side frames, has been fixed by each separately welding (for example, Patent Document 1, Patent Document 2).
JP 2001-132006 A JP 2000-309940 A

In the conventional loader work machine, when fixing the stopper to one of the main frame or the side frame by welding or the like, it is difficult to position the stopper so as to correspond to the other boss part of the main frame or the side frame. There has been a problem that the fixing of the stopper to either the main frame or the side frame is troublesome.
Therefore, in view of the above problems, the present invention is configured so that the stopper can be easily and surely fixed by easily positioning the stopper with respect to the main frame or the side frame.

The technical means of the present invention for solving this technical problem includes a main frame attached to the traveling vehicle body and a side frame that supports the boom, and a boss portion is provided on each of the main frame and the side frame, The side frame is slidably engaged with the main frame, and the swing of the side frame with respect to the main frame is regulated at the swing position of the side frame where the boss portion of the main frame and the boss portion of the side frame coincide. In addition, one of the main frame and the side frame is provided with a stopper that comes into contact with the other boss part, and the main frame and the side frame are inserted into the main frame by inserting the mount pin through the matched boss part. In the loader work machine which fixed the side frame detachably,
The one boss part and the stopper of the main frame or side frame are integrally formed and fixed to one of the main frame or side frame ,
One of the main frame or the side frame is provided with an attachment hole for internally fitting and fixing the one boss, and the stopper is rotated around the boss so as to correspond to the other boss of the main frame or the side frame. A positioning mechanism is provided between the boss portion and the mounting hole so as to be positioned in the direction .

Further, according to another technical means of the present invention, an attachment hole for internally fitting and fixing the one boss portion is provided on one of the main frame or the side frame, and the stopper is provided on the other side of the main frame or the side frame. A positioning mechanism is provided between the boss portion and the mounting hole so as to be positioned so as to correspond to the boss portion.
According to another technical means of the present invention, the positioning mechanism includes a fitting convex portion and a fitting concave portion that are fitted to each other, and the fitting convex portion is provided on one of the boss portion side or the mounting hole side. The fitting recess is provided on the other side of the boss portion side or the attachment hole side.

According to another technical means of the present invention, the boss portion of the main frame and the boss portion of the side frame are formed in a cylindrical shape having the same diameter, and the other boss of the main frame or the side frame is provided on the stopper. This is in that a fitting groove for fitting the portion is provided.
According to another technical means of the present invention, the boss portion of the main frame and the boss portion of the side frame are formed in a cylindrical shape having an insertion hole for inserting the mount pin. Each has a mounting hole for inserting a boss portion, and each boss portion is inserted through the mounting hole into the main frame or the side frame and fixed by welding or the like.

Further, according to another technical means of the present invention, the side frame includes a pair of left and right side walls, mounting holes are respectively provided on the pair of side walls corresponding to the left and right sides, and a stopper is provided on the inner side in the left and right direction of the side walls. The boss part is inserted through the mounting hole, the insertion end of the boss part protrudes outward in the left-right direction of the side wall, and the stopper is in contact with or close to the inner surface in the left-right direction of the pair of side walls. And
The upper side of the main frame is inserted between the pair of left and right side walls of the side frame, and the boss portion of the main frame is fixed to the upper side of the main frame so as to protrude toward the pair of left and right side walls. is there.

  According to the present invention, the position where the stopper comes into contact with the other boss portion by the boss portion formed integrally with the stopper and restricts the swing of the side frame is the boss portion of the side frame and the boss portion of the main frame. The position where the stopper is fixed can be easily set so that the positions match each other, and the stopper can be positioned on the main frame or side frame so that the stopper can be easily and reliably attached to the main frame or side frame. it can.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a tractor-mounted loader working machine, which is exemplified as a work vehicle (loading vehicle) and has a front loader 3 mounted on the front portion of a tractor (traveling vehicle body) 2.
The tractor 2 is a two-shaft four-wheel tractor having a pair of left and right front and rear wheels 4, 5. A bonnet 6 that covers an engine, a radiator, and the like is provided at the front, and the bonnet 6 is formed with a curved upper surface. Yes.
The front loader 3 is attached to a side frame 13 detachably attached to a mounting frame 7 provided on the tractor 2, a boom 8 whose base side is pivotally connected to the side frame 13, and a front load side of the left and right booms 8. And a bucket 9 as a working tool.

As shown in FIGS. 10 and 11, the mounting frame 7 is a support provided on the lower part of the front portion of the tractor 2 (below the rear end side of the bonnet 6) so as to protrude in the left-right direction from the tractor 2. A base 11, a main frame 12 provided on the support base 11 so as to project upward from the support base 11, and an attachment fixed to the tractor 2 by being fixed to the inner side in the left-right direction of the support base 11 A pair of left and right plates 10 are provided. Therefore, the main frame 12 is attached to the traveling vehicle body 2, and the side frame 13 supports the boom 8.
As shown in FIG. 2, the boom 8 and the side frame 13 are provided in a pair on the left and right sides of the bonnet 6, and the left and right booms 8 have a cylindrical boom connector 14 on the front side thereof. The side frames 13 are attached to the main frame 12 on the same side in the left-right direction.

Each of the left and right booms 8 is pivotally connected to the upper part of the side frame 13 whose base end side (rear end side) is on the same side in the left-right direction by a pivot 36 so as to be pivotable about a horizontal axis. It can be swung freely.
In addition, a boom cylinder 15 composed of a double-acting hydraulic cylinder is interposed between the middle part in the longitudinal direction of each left and right boom 8 and the middle part in the vertical direction of each left and right side frame 13. The boom 8 can swing up and down.
In addition, a pair of left and right brackets 38 are provided at the lower rear portion of the bucket 9, and the front end side (front end side) of the boom 8 on the same side in the left and right direction is pivotally connected via a pivot 37. A single bucket cylinder 16 composed of a double-acting hydraulic cylinder is interposed between the central portion in the left-right direction and the central portion in the left-right direction of the boom coupling body 14, and the bucket 9 is shaken by the expansion and contraction of the bucket cylinder 16. It can be operated (squeeze dump operation is possible).

Each of the left and right booms 8 is formed in a mountain shape that is bent at the center in the longitudinal direction and protrudes upward as shown in FIGS. 1 to 3, and goes from the front and rear ends to the center in the longitudinal direction. Accordingly, the upper and lower widths are formed so as to gradually become wider.
Further, the boom 8 includes a front boom constituent body 8A from the front in the longitudinal direction, a rear boom constituent 8B from the rear in the longitudinal center, and the front and rear boom constituents 8A and 8B. It is mainly composed of a central connecting plate 17 connected on the center side in the direction and side plates 18 arranged on both left and right sides on the center side in the longitudinal direction of the boom 8.

The front and rear boom constituent bodies 8A and 8B are composed of a main body 19 and a bottom plate 20, and the front and rear boom constituent bodies 8A and 8B are formed in the same shape so that the members can be shared.
The main body 19 is formed in a U-shaped cross-section that is open downward from a pair of left and right side plates 21 and a top plate 22 that connects the upper edge portions of the left and right side plates 21, and is curved to be convex upward. It is formed in a shape.
The main body 19 of the front and rear boom constituent bodies 8A and 8B is formed in a U-shaped cross-section by bending a single plate material, and is bent into a U-shape and then curved upward. It is bent.

Further, the upper surface (the upper surface of the top plate 22) and the lower edge (the lower edge portion 21a of the left and right side plates 21) of the main body 19 of the front and rear boom constituent bodies 8A and 8B are bent into circular arc surfaces having a constant radius of curvature. Yes.
As a result, the upper surface of the boom 8 is formed in a curved shape from the front end to the rear end, and has a shape that matches the curved shape of the bonnet 6 in design.
Further, a front pivot support portion 23 is provided on the front end side of the front boom structural body 8A. The front pivot support portion 23 is formed of a cylindrical body that penetrates the left and right side plates 21 and is fixed to the side plates 21 by welding. By inserting the pivot shaft 37 through the bracket 38 provided on the back surface of the bucket 9, the bucket 9 is pivotally connected so as to be rotatable about the left and right axes.

Further, a rear pivot portion 24 is provided on the rear end side of the rear boom constituent body 8B. The rear pivot portion 24 is formed of a cylindrical body that penetrates the left and right side plates 21 and is welded and fixed to the side plates 21. The boom 8 is pivotally connected to the side frame 13 so as to be rotatable about the left and right axes by inserting the pivot 36 through the frame 13.
The rear side of the side plate 21 on the inner side in the left-right direction of the left and right front boom components 8A is connected by the boom connector 14.
The bottom plate 20 is configured by a flat plate, and is disposed below the top plate 22 and between the left and right side plates 21, and the front and rear boom constituent bodies 8 </ b> A and 8 </ b> B are pivoted forward and backward from the end of the boom 8 in the longitudinal direction center side. It is provided so as to reach the support portions 23, 24, and after bending the main body 19, the left and right side edge portions of the bottom plate 20 are welded and fixed to the inner surfaces of the left and right side plates 21.

  The bottom plate 20 has one end in the front-rear direction abutting against the front and rear pivots 23 and 24, and the other end in the front-rear direction is a midway portion in the vertical width direction of the center portion in the longitudinal direction of the boom 8. The bottom plate 20 is located closest to the lower edge of the side plate 21 at the midway portion in the longitudinal direction of the bottom plate 20 and is located in the middle of the bottom plate 20. The distance from the bottom plate 20 to the lower side edge portion 21a of the side plate 21 is formed so as to gradually increase from the portion to the longitudinal center portion of the boom 8, thereby A pipe housing space 25 is formed below the bottom plate 20 and between the left and right side plates 21.

As shown in FIGS. 3 and 4, hydraulic pipes 26 and 27 are housed in a pipe housing space 25 of the boom 8 on the left and right side (right side in the present embodiment).
The hydraulic pipes 26 and 27 are arranged so that a total of four hydraulic pipes 26 and 27, two for the boom cylinder 15 and two for the bucket cylinder 16, are along the bottom plate 20.
The rear side of each hydraulic pipe 26, 27 is connected to a control valve provided on the right main frame 12 or the like via a hydraulic hose.
The front side of the hydraulic piping 26 for the boom cylinder 15 is disposed on the lower side of the boom coupling body 14 along the boom coupling body 14 and connected to the left boom cylinder 15 via a hydraulic hose. The hydraulic pipe 26 is branched by a branch member 28 on the right front side, and the branch member 28 is connected to the right boom cylinder 15 via a hydraulic hose.

The hydraulic piping 27 for the bucket cylinder 16 is disposed on the lower side of the boom connection body 14 along the boom connection body 14 to the left. Connected to the cylinder 16.
As shown also in FIG. 5, the hydraulic pipes 26, 27 arranged along the lower surface side of the boom connection body 14 are provided on both the left and right sides of the lower surface side of the boom connection body 14 that connects the left and right booms 8. A mounting base 40 for mounting the clamp member 39 to be mounted is fixed.
As described above, since the distance from the bottom plate 20 to the lower edge 21a of the side plate 21 is large at the center in the left-right direction of the boom 8, and the width between the left and right side plates 21 is narrow, the bottom plate 20 is used as the side plate 21. In welding, it is difficult for a welding torch to enter between the side plates 21 on the center side in the longitudinal direction of the boom 8, and it is difficult to weld the bottom plate 20 to the side plate 21 on the center side in the longitudinal direction of the boom 8.

Therefore, a notch 29 is formed on the upper side of the main body 19 of the front and rear boom constituent bodies 8A and 8B on the center side in the longitudinal direction of the boom 8, and the boom 8 The bottom plate 20 is welded to the side plate 21 from the lower side over the middle part in the longitudinal direction, and the bottom plate 20 is welded to the side plate 21 from the upper side at the longitudinal center side of the boom 8.
The notch 29 cuts the top plate 22 in a predetermined range in the boom longitudinal direction from the end of the top side of the boom 8 in the longitudinal direction of the boom 8 and at the midway portion in the vertical width direction of the left and right side plates 21 from the notch. Notched over.

The front and rear boom constituent bodies 8A and 8B are welded and fixed to the main body 19 at the center in the longitudinal direction of the boom 8, the front and rear bottom plates 20 are welded to each other, and the central connecting plate 17 is joined. The left and right side plates 18 are connected to the boom constituent bodies 8A and 8B by welding.
The central connecting plate 17 is formed by bending a flat plate into a curved shape that protrudes upward, and is provided over the top plates 22 of the front and rear boom constituent bodies 8A and 8B.
The radius of curvature of the central connecting plate 17 is formed to be smaller than the radius of curvature of the upper surfaces of the front and rear boom constituent bodies 8A and 8B.

Therefore, when forming the boom 8 having different curvature radii on the upper surface of the boom 8 on the center side in the longitudinal direction and the front and rear sides, the boom 8 can be easily manufactured by connecting the members having different curvature radii. .
The left and right side plates 18 are provided so as to extend over the side plates 21 of the front and rear boom constituent bodies 8A and 8B on the center side in the longitudinal direction of the boom 8, and cylinders projecting downward from the boom 8 to the lower portions of the left and right side plates 18. A pivot portion 30 is provided, and the boom cylinder 15 is pivotally connected to the cylinder pivot portion 30.

The side plate 18 on the inner side in the left-right direction extends forward from the outer side plate 18 and has a hole 41 through which the boom connector 14 is inserted.
On the front end side and the rear end side of the top plate 22 of the front boom structural body 8A, and the front end side and the rear end side of the top plate 22 of the rear boom structural body 8B, the main bodies 19 of the front and rear boom structural bodies 8A and 8B are respectively provided. A guide hole 42 for positioning when bending is formed in a penetrating shape.
Further, the front pivot portion 23 and the rear pivot portion 24 are provided with grease nipples 43 for supplying grease to the outer peripheral portions of the pivot shafts 36 and 37. As shown in FIG. It is provided at a position corresponding to the guide hole 42 formed on the front end side of the top plate 22 of the boom structural body 8A and the rear end side of the top plate 22 of the rear boom structural body 8B. The grease nipple 43 is protected by the top plates 22 of the front and rear boom constituent bodies 8A and 8B.

In particular, in the case where the grease nipple 43 provided at the bucket pivot support portion on the front end side of the front boom structure 8A is provided on the front end side surface in the boom longitudinal direction of the front pivot support portion 23, the grease nipple 43 Is easily damaged by gravel, etc., and a cover member is separately provided to protect the grease nipple 43. However, this increases the cost, but the structure of the present embodiment does not increase the cost.
As shown in FIGS. 10-12, the side frame 13 is comprised from the left-right paired side wall 13a and the connection wall 13b which connects this left-right side wall 13a.

An engagement pin 45 having a left and right axial center is provided at the front end on the lower end side of the side frame 13, and the engagement pin 45 passes through the left and right side walls 13a of the side frame 13 and is fixed to the side wall 13a. ing. A boss 81 and a stopper 82 are provided on the rear side of the middle portion of the side frame 13 in the vertical direction. The boss portion 81 and the stopper 82 are attached to the pair of left and right side walls 13a so as to correspond to the left and right, respectively.
The main frame 12 is formed of a thick plate material and is fixed to the left and right outer end sides of the support base 11, and the upper side of the main frame 12 is inserted between a pair of left and right side walls 13 a of the side frame 13. A cylindrical boss portion 47 having a horizontal axis is provided in the upper portion of 12 so as to penetrate in the horizontal direction. A receiving member 49 having an open arcuate groove 48 is fixed to the front part of the middle part of the main frame 12 in the vertical direction.

  By fitting the engagement pin 45 of the side frame 13 into the concave groove 48 of the receiving member 49 of the main frame 12 from above, the side frame 13 is moved back and forth about the horizontal axis (engagement pin 45) with respect to the main frame 12. The boss portion 47 of the main frame 12 and the boss portion 81 of the side frame 13 coincide with each other by adjusting the side frame 13 to swing back and forth about the horizontal axis with respect to the main frame 12. It is supposed to do. The mount pin 46 is inserted into the main frame 12 and the side frame 13 through the boss portions 47 and 81 that coincide with each other as described above, so that the side frame 13 can be detachably fixed to the main frame 12. ing.

The stopper 82 is disposed behind the boss portion 81, and the boss portion 47 of the main frame 12 is at the swing position of the side frame 13 where the boss portion 47 of the main frame 12 and the boss portion 81 of the side frame 13 coincide. The side frame 13 is restricted from swinging backward with respect to the main frame 12.
The boss portion 47 of the main frame 12 is formed in a cylindrical shape having an insertion hole 84 for inserting the mount pin 46. An attachment hole 85 for inserting the boss portion 47 is provided in the main frame 12, and the boss portion 47 is inserted into the main frame 12 through the attachment hole 85 so as to protrude on both the left and right sides, and is fixed by welding or the like. As a result, the boss portion 47 protrudes toward the pair of left and right side walls 13 a of the side frame 13 on the upper side of the main frame 12.

As shown in FIGS. 10, 11, and 16 to 21, the boss portion 81 of the side frame 13 is formed in a cylindrical shape having an insertion hole 86 for inserting the mount pin 46, and the stopper 82 is formed in a rectangular parallelepiped shape. The boss portion 81 and the stopper 82 are integrally formed and fixed to the side walls 13a of the side frame 13, respectively.
Mounting holes 87 for inserting the boss portions 81 are provided in the pair of side walls 13a corresponding to the left and right sides. A stopper 82 is positioned on the inner side in the left and right direction of the pair of left and right side walls 13, and The portion 81 is inserted, the insertion end of the boss portion 81 protrudes outward in the left-right direction of the side wall 13, and the stopper 82 is in contact (or close) with the inner surface in the left-right direction of the pair of side walls 13 a. Each boss 81 is inserted into the side wall 13a of the side frame 13 through the mounting hole 87 and fixed by welding or the like.

A concave groove 88 is formed on the side wall 13a side of the boundary portion between the boss portion 81 and the stopper 82, thereby eliminating the rounding that occurs at the boundary portion between the boss portion 81 and the stopper 82, and the horizontal direction of the stopper 82. The outer end surface of the side wall can be brought into contact with the inner surface of the side wall 13a.
A positioning mechanism 90 is provided between the boss portion 81 and the mounting hole 87 so that the stopper 82 is positioned so as to correspond to the boss portion 47 of the main frame 12. The positioning mechanism 90 includes a fitting convex portion 91 and a fitting concave portion 92 that are fitted to each other, the fitting convex portion 91 is formed on the boss portion 81 side, and the fitting concave portion 92 is formed on the mounting hole 87 side. Yes.

The boss portion 81 of the side frame 13 and the boss portion 47 of the side frame 13 are formed in a cylindrical shape having the same diameter, and the stopper 82 is provided with a fitting groove 93 for fitting the boss portion 47 of the main frame 12. The inner surface of the fitting groove 93 is formed as an arc surface that is flush with the outer peripheral surface of the boss portion 81 (same axis surface).
A plate 50 is provided below the mount pin 46 on the outer surface of the side wall 13a on the outer side in the left-right direction of the side frame 13, and a retaining pin 51 having a smaller diameter than the mount pin 46 is provided on the outer end side in the left-right direction of the mount pin 46. As shown in FIG. 12A, the retaining pin 51 is inserted in the radial direction, and is inserted into an insertion hole 52 formed in the plate 50, whereby the mount pin 46 is inserted into the side frame 13 and the cylinder. The mounting pin 46 is configured to be removed from the side frame 13 and the cylindrical body 47 by being prevented from being detached from the body 47 and by removing the retaining pin 51 upward from the insertion hole 52 of the plate 50. Yes.

The insertion hole 52 formed in the plate 50 is formed to have a size that allows the mount pin 46 to be inserted, and when the mount pin 46 is removed from the side frame 13 and the cylindrical body 47, FIG. As shown in b), the mount pin 46 can be held (stored) by inserting the mount pin 46 into the insertion hole 52 of the plate 50.
The front loader 3 includes a stand 53 that supports the boom 8 in a state where the bucket 9 is grounded as shown in FIG. 8 when the front loader 3 is detached from the tractor 2.

  As shown in FIGS. 1, 2, and 5 to 8, the stand 53 includes a pair of left and right stand members 54 provided corresponding to the left and right booms 8 and a connecting member that connects the left and right stand members 54. 55, and the front end sides of the left and right stand members 54 are rotatable about the left and right axial centers on the support shafts 56 and 57 provided on the front side of each of the left and right front boom members 8A. As shown in FIG. 8, by pivoting and rotating the stand 53 around the support shafts 56 and 57, as shown in FIG. As shown in FIG. 1 and FIG. 5, the left and right stand members 54 can be freely changed to a non-use position along the boom 8.

Each of the left and right stand members 54 is divided into a front constituent member 54A on the front side of the connecting member 55 and a rear constituent member 54B on the rear side of the connecting member 55. The front constituent member 54A and the rear constituent member 54B is formed of a single strip material whose thickness direction is the left-right direction, and the rear end side of the front component member 54A is fixed to the front side of the connecting member 55 by welding or the like. The front end side is fixed to the rear surface side of the connecting member 55 by welding or the like.
Support holes 58 and 59 are formed in the thickness direction (left and right direction) through the front end side of the front component member 54A of the left and right stand member 54, respectively, and on the rear end side of the rear component member 54B of the left and right stand member 54 A grounding portion 60 formed by being bent inward in the left-right direction is provided.

The support hole 58 of the front component member 54A of the left (right and left side) stand member 54 is formed in a circular hole, and the support hole 59 of the front component member 54A of the right (right and left side) stand member 54 is a square hole. Is formed.
The left and right support shafts 56 and 57 that support the left and right stand members 54 have a left-right axial center and are concentrically arranged on the inner surface in the left-right direction of the front portion of the left and right front boom structural body 8A. In addition, it is provided as a protruding shape on the inner side in the left-right direction.
The left support shaft 56 is constituted by a cylindrical pin.

The right support shaft 57 is configured by a pin formed by cutting a central portion of a quadrangular prism in the axial direction in a substantially cylindrical shape, and the cylindrical portion on the central side in the axial direction rotates the right stand member 54. A rotation permission portion 57 a that is allowed is formed, and a prism portion on the inner end side in the left-right direction is a rotation restriction portion 57 b that restricts the rotation of the right stand member 54.
With the support hole 58 of the left stand member 54 fitted into the left support shaft 56 and the support hole 59 of the right stand member 54 fitted into the rotation allowing portion 57a of the right support shaft 57, the stand 53 is rotatable about the left and right support shafts 56, 57, and the stand 53 is swingable up and down (can be raised and lowered) with the pivot portion on the front side as a fulcrum.

Since the stand 53 has left and right stand members 54 connected by a connecting member 55, the operation of changing the position of the stand 53 between the use position and the non-use position is performed from one side (right side or left side) of the tractor 2 in the left-right direction. It is possible only by raising and lowering operation.
The left and right stand members 54 are rotatable on the inner side in the left and right direction of the boom 8. When not in use, the left and right stand members 54 are located on the inner side in the left and right direction of the boom 8. It is located so as to overlap with 8 in the left-right direction.
Thus, when the stand 53 is not used (stored), the stand member 54 is hidden by the boom 8 when viewed from the outside, and the appearance is improved when the stand 53 is not used.

  Further, a pin insertion hole 61 is formed on the rear side of the support hole 58 in the front portion of the front component member 54A of the left stand member 54, and the left inner side surface of the left boom 8 is A locking pin 62 positioned on an arc whose center is the left support shaft 56 and whose radius is the distance between the shaft centers of the left support shaft 56 and the pin insertion hole 61 is fixed in a projecting manner inward in the left-right direction. As shown in FIG. 6D, the pin insertion hole 61 and the locking pin 62 are substantially aligned with each other in the left-right direction when the stand 53 is in the use position. Thus, the pin insertion hole 61 can be fitted.

Further, when the stand 53 is in the use position, as shown in FIG. 6B, the support hole 59 of the right stand member 54 can be fitted into the rotation restricting portion 57a of the right support shaft 57. The stand member 54 can be moved left and right at the position (Note that the movement of the stand 53 to the right from the state in which the right support hole 59 is fitted to the rotation allowing portion 57a is applied to the left support shaft 56. It is configured to be regulated by a retaining member such as a beta pin to be inserted).
Therefore, when the stand 53 is located at the use position, the stand 53 is moved to the left from the state in which the right support hole 59 is fitted to the rotation allowing portion 57a. When the pin insertion hole 61 is fitted to the locking pin 62 and the support hole 59 of the right stand member 54 is fitted to the rotation restricting portion 57b of the right support shaft 57, the support shaft 56 of the stand 53, The rotation around 57 is restricted, and the stand 53 is held (locked) in the use position.

In this state, by inserting a retaining member such as a beta pin into the locking pin 62, the movement of the stand 53 to the right is restricted.
Note that the prism portion 57c on the right and left outer ends of the right support shaft 57 is used for attaching and detaching the stand 53, and the support hole 59 of the right stand member 54 is fitted into the prism portion 57c. By moving 53 to the right, the support hole 58 of the left stand member 54 is configured to be disengaged from the left support shaft 56.
The connecting member 55 includes a front wall portion 63, a rear wall portion 64, and a bottom wall portion 65 that connects lower end sides of the front and rear wall portions 63 and 64, and the left and right and upper sides are open. It is formed in a groove shape.

Further, as shown in FIG. 5, the connecting member 55 is positioned along the boom connecting body 14 below the boom connecting body 14 when the stand 53 is set to the non-use position. The hydraulic pipes 26 and 27, the mounting base 40, and the clamp member 39 provided along the upper and lower sides are covered from below, and the connecting member 55 protects the hydraulic pipes 26 and 27 and the like when the stand 53 is not used. It is a cover.
Further, a pin insertion hole 66 is formed in the substantially central portion of the bottom wall portion 65 of the connecting member 55 in the left-right direction, and the stand 53 is in a non-use position at the substantially central portion in the left-right direction on the lower surface side of the boom connector 14. In some cases, a locking pin 67 into which the pin insertion hole 66 can be fitted is fixed in a projecting manner on the lower side.

Therefore, the stand 53 can be held in the non-use position by inserting the retaining pin such as a beta pin into the retaining hole 68 of the locking pin 67 with the stand 53 in the non-use position.
Since the locking pin 67 is located at a substantially central portion in the left-right direction of the front loader 3, the retaining pin can be inserted into and removed from either the left or right of the tractor 2.
In order to remove the front loader 3 having the above-described configuration from the tractor 2, for example, the front end side of the bottom portion of the bucket 9 is first grounded and the mount pin 46 is moved to the side frame 13 with the stand 53 lowered from the non-use position to the use position. The boss portion 81 and the boss portion 47 of the main frame 12 are removed. The removed mount pin 46 is inserted and held in the insertion hole 52 of the plate 50.

Next, when the bucket cylinder 16 is contracted, the boom 8 swings around the grounding portion 60 of the stand 53 so that the boom 8 is lowered and the grounding portion 60 of the stand 53 is grounded, and then the side frame 13 is lifted. The engaging pin 45 of the side frame 13 is disengaged upward from the concave groove 48 of the receiving member 49 of the main frame 12, and the front loader 3 is in a state where the bottom of the bucket 9 is grounded as shown in FIG. The boom 8 is in a standing state supported by the stand 53.
After that, the hydraulic hose connected to the control valve side is disconnected from the hydraulic pipes 26 and 27 provided in the front loader 3, and the tractor 2 is moved backward.

  When the front loader 3 is attached to the tractor 2, it is performed by an operation reverse to the above operation. In this case, the side frame 13 is lowered in a forward inclined posture, and first, the engaging pin 45 of the side frame 13 is fitted into the concave groove 48 of the receiving member 49 of the main frame 12 from above, so that the main frame 12 On the other hand, the side frame 13 is engaged so as to be swingable back and forth around the horizontal axis (engagement pin 45), and then the side frame 13 is adjusted to swing back around the horizontal axis with respect to the main frame 12, When the stopper 82 is brought into contact with the boss portion 47 of the main frame 12, the boss portion 47 is fitted into the fitting groove 93 of the stopper 82, and the boss portion 47 of the main frame 12 and the boss portion 81 of the side frame 13 coincide. Backward swinging of the side frame 13 with respect to the main frame 12 is restricted at the swinging position of the side frame 13 to be performed. Thereafter, the mount pin 46 may be inserted into the main frame 12 and the side frame 13 through the matched boss portions 47 and 81, and the retaining pin 51 may be inserted into the mount pin 46. 12 is easily fixed.

  In the embodiment, since the boss portion 81 and the stopper 82 of the side frame 13 are integrally formed and fixed to the side frame 13, by fixing the boss portion 81 formed integrally with the stopper 82, The position where the stopper 82 contacts the boss portion 47 of the main frame 12 and restricts the swinging of the side frame 13 is such that the boss portion 81 of the side frame 13 and the boss portion 47 of the main frame 12 coincide with each other. In addition, the fixing position of the stopper 82 can be set easily and with high accuracy, and the stopper 82 can be easily positioned on the side frame 13 and can be easily and reliably attached to the side frame 13.

  Further, the side frame 13 is provided with an attachment hole 87 for fixing the boss portion 81 internally, and the boss portion 81 and the attachment hole are positioned so that the stopper 82 is positioned so as to correspond to the boss portion 47 of the main frame 12. The positioning mechanism 90 is provided between the boss portion 81 and the boss portion 81 so that the fitting convex portion 91 and the fitting concave portion 92 are fitted when the boss portion 81 is inserted into the mounting hole 87 and fixed. The stopper 81 is easily positioned at a position corresponding to the boss portion 47 of the main frame 12 by rotating the portion 81 and passing through the mounting hole 87 of the side frame 13 and fixing by welding or the like. 81 and the stopper 82 can be easily and reliably attached to the side frame 13. In addition, the boss 81 and the stopper 82 are integrally formed regardless of the fact that the stopper 82 is attached to the side frame 13 while being positioned on the inner side in the left-right direction of the pair of side walls 13a. The boss portion 81 may be welded from the outer surface side, and the stopper 82 can be easily fixed together with the boss portion 81.

In the embodiment described above, the boss portion 81 and the stopper 82 of the side frame 13 are integrally formed and are fixed to the side frame 13. Instead, the boss portion 47 of the side frame 13 is used. And the stopper 82 are integrally formed, and the stopper 82 is fixed to the main frame 12 together with the boss portion 47, and the stopper 82 is brought into contact with the boss portion 81 of the side frame 13 to swing around the horizontal axis of the side frame 13. The movement may be restricted.
Moreover, in the said embodiment, the positioning mechanism 90 is comprised by the fitting convex part 91 and the fitting recessed part 92 which mutually fit, and the fitting convex part 91 of the positioning mechanism 90 is provided in the boss | hub part 81 side, and is fitted. The joint recess 92 is provided on the mounting hole 87 side. Instead, the fitting convex portion 91 of the positioning mechanism 90 is provided on the mounting hole 87 side, and the fitting concave portion 92 is provided on the boss portion 81 side. Also good. Further, the positioning mechanism 90 may be configured by other than the fitting convex portion 91 and the fitting concave portion 92, for example, by forming the boss portion 81 and the mounting hole 87 in a polygonal shape corresponding to each other, The positioning mechanism 90 may be configured.

It is a side view of a work vehicle. It is the figure which looked at the front loader of the working vehicle of FIG. 1 from front diagonally upward. It is side surface sectional drawing of a boom. FIG. 4 is a sectional view taken along line AA in FIG. 3. (A) is the side view which looked at the boom and the stand at the time of non-use from the center part in the left-right direction, (b) is the expanded cross section of the part which has covered hydraulic piping with the connection member of the stand. (A) is a side view of the pivot portion at the non-use position of the right stand member, (b) is a side view of the pivot portion at the use position of the right stand member, and (c) is a non-use position of the left stand member. (D) is a side view of the pivot part in the use position of the left stand member. (A) is a top view of a stand, (b) is the partial cross-section enlarged view of the pivot part of the right side stand member, (c) is the partial cross-section enlarged view of the pivot part of the left side stand member. It is a side view which shows the state which removed the front loader. (A) Side surface sectional drawing of the base part of a boom, (b) is side surface sectional drawing of the front-end | tip part of a boom. It is a side view of an attachment frame and a side frame. It is a front view of an attachment frame and a side frame. (A) is a side view of a state in which the mount pin is inserted through the main frame and the side frame, and (b) is a side view of a state in which the mount pin is removed from the main frame and the side frame and held in the main frame. It is a front view of a main frame and a support stand part. It is a side view of a main frame and a support stand part. It is a side view of the main frame before attaching a boss | hub part etc. It is a front view of a side frame. It is a side view of a side frame. It is a side view of the side frame before attaching a boss | hub part etc. It is a front view of a boss | hub part and a stopper. It is a side view of a boss | hub part and a stopper. It is a rear view of a boss | hub part and a stopper. It is the BB sectional view taken on the line of FIG.

Explanation of symbols

2 Tractor (vehicle body)
8 Boom 12 Main frame 13 Side frame 13a Side wall 46 Mount pin 47 Boss part 81 Boss part 82 Stopper 84 Insertion hole 85 Installation hole 86 Insertion hole 87 Installation hole 90 Positioning mechanism 91 Fitting convex part 92 Fitting concave part 93 Fitting groove

Claims (5)

A main frame (12) attached to the traveling vehicle body (2) and a side frame (13) that supports the boom (8) are provided, and the bosses (47, 47) are provided on the main frame (12) and the side frame (13), respectively. 81), the side frame (13) is swingably engaged with the main frame (12), and the boss portion (47) of the main frame (12) and the boss portion (81 of the side frame (13)) ) On one side of the main frame (12) or the side frame (13) so as to regulate the swing of the side frame (13) relative to the main frame (12) at the swing position of the side frame (13). A stopper (82) that contacts the other boss portion (81, 47) is provided, and the boss portion that coincides with the main frame (12) and the side frame (13). By inserting the mounting pin (46) via 47,81), the loader work machine as freely to fix releasably the side frame (13) to the main frame (12),
One boss part (47, 81) and the stopper (82) of the main frame (12) or the side frame (13) are integrally formed, and one of the main frame (12) or the side frame (13) is formed. Fastened ,
One of the main frame (12) or the side frame (13) is provided with mounting holes (85, 87) for internally fitting and fixing the one boss portion (47, 81), and the stopper (82), The boss portions (47, 81) and the mounting holes (85) are positioned so as to be positioned in the rotational direction around the boss portions so as to correspond to the other boss portions (81, 47) of the main frame (12) or the side frame (13). , 87) is provided with a positioning mechanism (90) . The positioning mechanism (90) includes a fitting convex portion (91) and a fitting concave portion (92) that are fitted to each other, and the fitting convex portion (91) is formed on the boss portion (81) side or the mounting hole (87). The loader working machine according to claim 1, wherein the fitting recess (92) is provided on the other side of the boss portion (81) side or the mounting hole (87) side. . The boss portion (47) of the main frame (12) and the boss portion (81) of the side frame (13) are formed in a cylindrical shape having the same diameter, and the stopper (82) is connected to the main frame (12) or Fitting groove for fitting the other boss part (81, 47) of the side frame (13)
(93) is provided , The loader work machine of Claim 1 or 2 characterized by the above-mentioned. The boss portion (47) of the main frame (12) and the boss portion (81) of the side frame (13) are formed in a cylindrical shape having insertion holes (84, 86) for inserting the mount pins (46). The main frame (12) and the side frame (13) are provided with attachment holes (85, 87) for inserting the boss portions (47, 81), respectively, and each boss portion (47, 81) is provided with an attachment hole. (4) The main frame (12) or the side frame (13) is respectively inserted through (85, 87) and fixed by welding or the like . Loader work machine. The side frame (13) includes a pair of left and right side walls (13a), and the pair of side walls (13a) are respectively provided with mounting holes (87) corresponding to the left and right sides. The stopper (82) is positioned on the side, the boss portion (81) is inserted into the mounting hole (87), and the insertion end of the boss portion (81) is projected outward in the left-right direction of the side wall (13a). The stopper (82) is in contact with or close to the inner surface in the left-right direction of the pair of side walls (13a),
The upper side of the main frame (12) is inserted between the pair of left and right side walls (13a) of the side frame (13), and the boss portion (47) of the main frame (12) is located on the upper side of the main frame (12). The loader working machine according to any one of claims 1 to 4, wherein the loader working machine is fixed so as to protrude toward the pair of left and right side walls (13a) .

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