JP3947612B2 - Work machine mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a detachable configuration of a front loader that is attached to a front portion of a tractor that performs farm work or the like.
[0002]
[Prior art]
Conventionally, a main frame is erected on the front left and right side surfaces of a traveling machine body such as a tractor, a lift arm is pivotally supported on the upper portion of the main frame, and a carrier which is a mounting member at the front end of the lift arm. A front loader in which a tool is pivotally supported, a bucket or the like as an attachment is mounted using the carrier tool, and a lift cylinder disposed below the lift arm can be driven to move up and down is known.
[0003]
As shown in FIGS. 9 and 10, the base portion of the front loader such as the lift arm and the lift cylinder is pivotally supported by the subframes 14 and 14 which are supporting members, and the subframes 14 and 14 are the upper parts of the main frame 10. It was configured to be detachable. When the sub-frames 14 and 14 are attached to the main frame 10, the locking pins 16 provided horizontally between the lower ends of the sub-frames 14 and 14 are locked to the engaging recess 10 d provided at the front lower part of the main frame 10. . A boss 42 is laterally provided on the upper portion of the main frame 10, a stopper 40 is laterally fixed in the middle of the subframes 14, 14, and bosses 41, 41 are provided on the rear portions of the subframes 14, 14. When the stopper 40 is fixedly brought into contact with the upper portion of the main frame 10, the axial centers of the bosses 41 and 41 and the boss 42 are aligned, and the fastening pin 17 is inserted into the bosses 41 and 41 and the boss 42. It was designed to be worn.
[0004]
[Problems to be solved by the invention]
However, in the mounting configuration as described above, the positions of the axial centers of the bosses 41 and 41 and the boss 42 are shifted due to welding distortion and welding error of the stopper 40, and wear. Therefore, the front loader cannot be easily mounted on a working machine such as a tractor.
[0005]
[Means for Solving the Problems]
The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.
The both sides after the body frame (3), the left and right main frame for mounting a front loader (9) to (10, 10) projecting upwardly and fixedly provided, the one of the main frame (10) in the upper right and left The sub-frames (14, 14) as attachment members of the front loader (9) are arranged in parallel as two left and right plate members, and the sub-frames (14, 14) can be attached to and detached from the main frame (10). fitting in the working machine mounting structure, the engagement recess (10d) formed in the main frame (10) by laterally disposed locking pin (16) between the lower portion of the left and right sub-frame (14, 14) It is allowed Rutotomoni, the upper portion of the main frame (10), fixedly mainframe boss (42) for inserting a fastening pin (17), inside the left and right sub-frame (14, 14), the main In accordance with the position of Remubosu (42), the left and right sub-frame boss inserting the fastening pin (17) (32, 32) provided the combined axial, of the left and right sub-frame boss (32 & 32) On the rear side of the side surface, a semicircular arc-shaped engagement portion (32b / 32b) is formed, and the inner circumferential surface of the arc of the engagement portion (32b / 32b) is formed on the main frame boss (42). A part of the outer periphery of the main frame boss (42) is formed so as to be fitted to the engaging portion (32b, 32b) in accordance with the shape of the outer peripheral surface.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described. 1 is a side view of a tractor with a loader attached to the front, FIG. 2 is a plan sectional view showing a frame for supporting the front loader of the present invention, FIG. 3 is a partial sectional view taken along line AA in FIG. FIG. 5 is a cross-sectional view, FIG. 6 is a partial side view when the stand can be stored below the connecting frame, and FIG. 7 is a partial plan view. 8 is a partial plan view when the stand is rotated rightward and stored below the connecting frame, FIG. 9 is a plan sectional view showing a frame for supporting a conventional front loader, and FIG. 10 is a plan view of FIG. It is a BB partial sectional view.
[0007]
An embodiment in which the front loader 9 is mounted on the tractor 2 will be described with reference to FIG. In the upper part of the body frame 3 supported by the front wheels 7 and the rear wheels 8, the bonnet 1 that covers the engine is disposed in front, and the operation unit 5 is disposed in the rear part. The operating unit 5 is covered with a cabin 6, and a steering wheel, a main transmission lever, an auxiliary transmission lever, an elevator lever for a working machine, and the like are disposed in the cabin 6 for steering operation.
[0008]
Further, main frames 10 and 10 protrude upward to be fixed to the both sides of the rear body frame 3 in order to attach the front loader 9, and a subframe 14 which is an attachment member of the front loader 9 is provided above the main frame 10.・ 14 is removable. As shown in FIGS. 1, 2, and 3, the main frame 10 includes a fixing portion 10 a extending in the front-rear direction for attachment to the body frame 3, and a mounting portion 10 b extending upward from the fixing portion 10 a. And is formed in a substantially inverted T shape in side view with a steel plate. A boss 42 is horizontally provided on the upper portion of the mounting portion 10b of the main frame 10, and an engagement concave portion 10d having a substantially U shape in side view is formed in the front upper and lower middle portions. Further, a rear hitch-shaped hitch frame 11 is provided at the rear end portion of the bonnet 1, and mounting plates 12 and 12 are projected in front of the hitch frame 11. The insertion holes 12a and 12a are opened in the part, and the insertion holes 12a and 12a are arranged so that the bosses 42 and the axial center of the mounting part 10b are aligned with each other.
[0009]
The sub-frames 14 and 14 have two left and right plate bodies arranged in parallel, and connecting members 15 and 15 sandwiched therebetween to connect the two. A link mounting hole 14a, a lift arm mounting hole 14b, and a lift cylinder mounting hole 14c are opened in the subframe 14 from above, and a locking pin 16 for engagement is disposed in the lower part of the subframes 14 and 14. The bosses 32 and 32 for inserting the fastening pins 17 are fixed in the middle of the upper and lower sides of the sub-frames 14 and 14 with the shaft cores aligned, and the positions of the bosses 32 and 32 are the positions of the engagement members. The distance between the shaft cores of the locking pin 16 and the fastening pin 17 is the position where the distance between the shaft core of the engaging recess 10d of the main frame 10 and the shaft core of the boss 42 fixed to the mounting portion 10b is the same. .
[0010]
As shown in FIGS. 2 and 3, engagement portions 32b and 32b having a semicircular arc shape when viewed from the side are formed on the rear sides of the left and right inner surfaces of the bosses 32 and 32, respectively. The inner peripheral surface of the arc of 32b is matched with the shape of the outer peripheral surface of the boss 42, and the axis is also matched. However, the engaging portion can be formed on the boss 42 side. Therefore, when the front loader 9 is attached, first, the subframes 14 and 14 are positioned above the main frames 10 and 10, and the subframes 14 and 14 are tilted so that the locking pins 16 are engaged with the engaging recesses 10d. And by further tilting about the locking pin 16 and engaging both the left and right sides of the boss 42 with the engaging portions 32b and 32b of the boss 32, the axis of the boss 32 and 32 and the axis of the boss 42 are engaged. In this state, the fastening pins 17 are inserted and connected to the bosses 32 and 32 and the bosses 42.
[0011]
Therefore, the boss 32 and its engaging portions 32b and 32b can be manufactured with high precision by cutting, forging, drilling, or the like, and there is no need to align the position with the stopper 40 as in the prior art, and welding is performed when the stopper 40 is attached. Due to distortion and welding errors, the positions of the bosses 32 and 32 and the boss 42 are not displaced. Further, even when the engaging recess 10d and the locking pin 16 are worn, the positions of the axial centers of the bosses 32 and 32 and the axial center of the boss 42 are not shifted.
[0012]
Then, the fastening pins 17 are inserted into the bosses 32 and 32, the insertion holes 12a and 12a of the mounting plates 12 and 12 and the bosses 42 provided laterally on the mounting portion 10b from the side of the mounting plate 12, The other end of the fastening pin 17 can be easily locked with a nut or the like.
[0013]
Next, the configuration of the front loader 9 will be described. As shown in FIG. 1, the front loader 9 includes a lift arm 18, a carrier tool 30 pivotally supported at the front end of the lift arm 18, and an attachment such as a bucket 50 attached by the carrier tool 30. The lift arm 18 is formed by bending a substantially central portion in the front-rear direction so as to have a “<” shape when viewed from the side. A bracket 19 is fixed to the central portion, and a base portion of the lift cylinder 20 is pivoted below the bracket 19. I support. The rear end of the lift arm 18 is pivotally supported in the lift arm mounting hole 14b of the subframe 14, and the rod side of the lift cylinder 20 is pivotally supported in the lift cylinder mounting hole 14c. It can be moved up and down by driving.
[0014]
A connecting member 21 is pivotally supported on the upper portion of the bracket 19 of the lift arm 18 so as to be rotatable in the front-rear direction. A base portion of the work machine cylinder 22 is pivotally supported at the front portion of the connection body 21, and the carrier tool 30 is connected to the tip of the rod of the work machine cylinder 22 via the arms 23 and 24. A link rod 25 is pivotally supported at the rear portion of the coupling body 21, and an end portion of the link rod 25 is pivotally supported by the link mounting hole 14 a of the subframe 14. Therefore, when the lift cylinder 20 is driven and the lift arm 18 is moved up and down, the bucket 50 is lifted and lowered by the parallel link mechanism formed by the link rod 25 while maintaining its posture. The left and right lift arms 18, 18 are connected and reinforced by a connecting frame 26 at the front.
[0015]
A mounting bracket 35 is fixed to the lower part of the front end of the lift arm 18, a pivot hole is provided on the side surface of the bracket 35, and a pivot hole is also provided on the base side of the stand 36. The stand 36 is pivotally supported so as to be pivotable in the vertical direction by penetrating through a pivot hole provided on the side surface of the mounting bracket 35 with a pin or the like. Therefore, when the front loader 9 is removed, the stand 36 is rotated and fixed downward as indicated by a two-dot chain line in FIG. 1, and when the front loader 9 is attached to perform the work, the stand 36 is fixed. 36 is rotated upward and stored in the lower part of the lift arm 18.
[0016]
As shown in FIGS. 4 and 5, the stand 36 is formed in a concave shape in sectional view so that the concave portion of the stand 36 can be fitted and accommodated in conformity with the outer shape of the lift arm 18. That is, one end (lower side) of the stand 36 is pivotally supported by a pivotal support 35 fixed to the lower surface of the lift arm 18, and the stand 36 is pivoted upward about the pivotal support 35 so as to be viewed from the side. The lift arm 18 is fitted and stored so as to overlap, so that it can be stored compactly.
[0017]
As shown in FIGS. 7 and 8, the pivot support 35 is pivotally supported on the lower surface of the front end of the lift arm 18 so as to be pivotable about the pivot shaft 38, and the stand 39 is attached to the pivot support 35. A pivot shaft 37 may be provided in a direction perpendicular to the pivot shaft 38 so as to pivot in the vertical direction.
With such a configuration, the stand 39 is rotated and folded upward, and further, as shown in FIGS. The connecting frame 26 is stored below. Therefore, it can be set as the structure compact in side view.
[0018]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
The both sides after the body frame (3), the left and right main frame for mounting a front loader (9) to (10, 10) projecting upwardly and fixedly provided, the one of the main frame (10) in the upper right and left The sub-frames (14, 14) as attachment members of the front loader (9) are arranged in parallel as two left and right plate members, and the sub-frames (14, 14) can be attached to and detached from the main frame (10). fitting in the working machine mounting structure, the engagement recess (10d) formed in the main frame (10) by laterally disposed locking pin (16) between the lower portion of the left and right sub-frame (14, 14) It is allowed Rutotomoni, the upper portion of the main frame (10), fixedly mainframe boss (42) for inserting a fastening pin (17), inside the left and right sub-frame (14, 14), the main In accordance with the position of Remubosu (42), the left and right sub-frame boss inserting the fastening pin (17) (32, 32) provided the combined axial, of the left and right sub-frame boss (32 & 32) On the rear side of the side surface, a semicircular arc-shaped engagement portion (32b / 32b) is formed, and the inner circumferential surface of the arc of the engagement portion (32b / 32b) is formed on the main frame boss (42). Since a part of the outer periphery of the main frame boss (42) is formed so as to be fitted to the engaging portion (32b, 32b) so as to match the shape of the outer peripheral surface, the subframe boss fixed to the subframe; The position of the axis of the main frame boss fixed to the main frame can be matched without shifting, and the fastening pin can be easily inserted, and positioning can be performed easily when the front loader is installed. ,work Than it was able to decrease between.
[Brief description of the drawings]
FIG. 1 is a side view of a tractor with a loader attached to the front.
FIG. 2 is a plan sectional view showing a frame that supports the front loader of the present invention.
FIG. 3 is a partial cross-sectional view taken along the line AA of FIG.
FIG. 4 is a partial side view when a stand having a concave shape in cross section is used.
FIG. 5 is a sectional view of the same.
FIG. 6 is a partial side view when the stand is configured to be housed below the connection frame.
FIG. 7 is a partial plan view of the same.
FIG. 8 is a partial plan view when the stand is rotated rightward and stored below the connection frame.
FIG. 9 is a plan sectional view showing a frame that supports a conventional front loader.
10 is a partial cross-sectional view taken along the line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Main frame 10d Engaging recessed part 12 * 12 Mounting plate 12a * 12a Insertion hole 14 Subframe 16 Locking pin 17 Fastening pin 32 * 32 * 42 Boss 32b * 32b Engaging part

Claims (1)

The both sides after the body frame (3), the left and right main frame for mounting a front loader (9) to (10, 10) projecting upwardly and fixedly provided, the one of the main frame (10) in the upper right and left The sub-frames (14, 14) as attachment members of the front loader (9) are arranged in parallel as two left and right plate members, and the sub-frames (14, 14) can be attached to and detached from the main frame (10). fitting in the working machine mounting structure, the engagement recess (10d) formed in the main frame (10) by laterally disposed locking pin (16) between the lower portion of the left and right sub-frame (14, 14) It is allowed Rutotomoni, the upper portion of the main frame (10), fixedly mainframe boss (42) for inserting a fastening pin (17), inside the left and right sub-frame (14, 14), the main In accordance with the position of Remubosu (42), the left and right sub-frame boss inserting the fastening pin (17) (32, 32) provided the combined axial, of the left and right sub-frame boss (32 & 32) On the rear side of the side surface, a semicircular arc-shaped engagement portion (32b / 32b) is formed, and the inner circumferential surface of the arc of the engagement portion (32b / 32b) is formed on the main frame boss (42). A work machine mounting structure characterized in that a part of the outer periphery of the main frame boss (42) is formed so as to be fitted to the engaging portion (32b, 32b) in accordance with the shape of the outer peripheral surface.

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