JP2501463Y2 - Work reaction force support device for work vehicle - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a work vehicle and a work vehicle for maintaining a stable state when the work machine is connected to a work vehicle such as a tractor and a carrier to perform a predetermined work. The present invention relates to a work reaction force support device for a vehicle.

[0002]

2. Description of the Related Art A work vehicle, such as a tractor, is used with various work machines connected to a rear portion or a front portion thereof. Among various working machines connected to the tractor, a backhoe, an auger, a winch, a trencher, a work table, and the like, which are connected to the rear portion of the tractor, and are used while the tractor is stopped when used. There is a method of using a three-point link hitch mounted on the tractor as a connection method of.

This three-point link hitch (B) is, as shown in FIG. 11, a pair of left and right lift arms (11) (11), lift rods (12) (12), lower links (13) (13) and a top. It consists of a link (14) and a lift arm (11) (1
1) is integrally connected by a crank shaft (15).

The crank shaft (15) is connected to a single-acting hydraulic cylinder (not shown) mounted on the tractor (A). Then, by operating the hydraulic cylinders to rotate the lift arms (11) (11) upward, the lower links (13) (13) are rotated upward around the fulcrum (16). ..

Further, as the top link (14), the one in which a return type hydraulic cylinder is integrally incorporated is used, and the total length thereof is variable.

As shown in FIG. 12, the working machine using the three-point link hitch (B), for example, the backhoe (C) and the tractor (A) is connected to the lower link (13) of the three-point link hitch (B). ) (13) and top link (14) with an auto hitch (20) attached to the tip, this auto hitch (20)
The engaging pins (31) and (32) provided on the main frame (30) of the backhoe (C) are fitted into the receiving portions (21) and (22) provided on the backhoe (C), and the backhoe (C) is attached to the rear portion of the tractor (A). ) Is connected and supported.

In the figure, (33) is a main frame (30)
The first arm (35) supported by the swivel frame (34) at one end is connected to the first arm (33) at one end,
A second arm, the other end of which is connected to the bucket (36), (37)
Reference numerals (38) and (39) denote hydraulic cylinders for changing the angles of the first and second arms (33, 35) and the bucket (36).

As described above, when the backhoe (C) is connected to the rear part of the tractor (A) by using the three-point link hitch (B) mounted on the tractor (A), the two are connected. However, when working with the backhoe (C), the work reaction force applied to the backhoe (C) must be received by the tractor (A) side, and the tractor (A) is always supported in a stable state. Was difficult.

Therefore, the present applicant has previously proposed a work reaction force support device (50) in which the work reaction force is not concentrated on the tractor (A) side but dispersed on the ground (actual application). Flat 1
-77174).

As shown in FIG. 12, the above-mentioned proposal is one in which a grader (51) and a work reaction force supporting stopper (52) are attached to a main frame (30) of a backhoe (C).

The grader (51) includes a pillar (53) extending downward from the main frame (30) of the backhoe (C), and an earth removing plate (5) fixed to the tip of the pillar (53).
4), and a stopper (5
2) is a storage support cylinder (55) fixed to the support column (53) and the soil discharge plate (54), and is slidably supported in the storage support cylinder (55) and has a tractor (A) at the tip. A support arm (57) having an abutment block (56) in pressure contact with the tire (D)
And is constituted by.

When the work reaction force support device (50) is not used, the support arm (57) is housed in the storage support cylinder (55) and the work reaction force support stopper (52) is shortened. The contact block (56) at the tip of the support arm (57) is prevented from contacting the tire (D) of the tractor (A), and the three-point link hitch (B) prevents the main frame (30) of the backhoe (C). ) Is lifted, and the earth removal plate (54) located below the main frame (30) is separated from the ground.

When the work reaction force support device (50) is used, the support arm (57) is manually pulled out from the storage support cylinder (55) and provided on both the storage support cylinder (55) and the support arm (57). The pin holes are aligned with each other, the pins are inserted through the pin holes, and the support arm (57) is fixed to the storage support cylinder (55).

Next, the lower links (13) and (13) of the three-point link hitch (B) are rotated downward by their own weight, and the main frame (30) of the backhoe (C) is lowered, so that the earth-discharging plate is discharged. (54) is brought into contact with the ground, the top link (14) is extended, and the main frame (30) is pressed counterclockwise in the figure with the engagement pin (21) as the center, whereby the support arm (57). The contact block (56) at the tip is brought into pressure contact with the tire (D) of the tractor (A).

The work reaction force generated when the backhoe (C) is used is dispersed on the ground through the soil discharging plate (54) and the tire (D) of the tractor (A) to stabilize the backhoe (C). It is intended to be used in the state.

[0016]

As described above, the work reaction force supporting device (50) including the grader (51) and the work reaction force supporting stopper (52) is provided below the main frame (30) of the backhoe (C). ), The work reaction force generated when the backhoe (C) is used can be dispersed, so that work can be performed in a stable state.

However, in order to use the work reaction force support device (50), the support arm (57) of the work reaction force support stopper (52) is manually pulled out from the storage support cylinder (55) and supported. It is necessary to fix the arm (52) to the storage support cylinder (55), and at the same time, after use, it is necessary to manually store the support arm (52) in the storage support cylinder (55) again.
There was a problem that this work was troublesome.

In order to use the work reaction force support device (50), the top link (14) of the three-point link hitch (B) is used.
It is necessary to use a hydraulic cylinder that is built into the top link (14) that incorporates this hydraulic cylinder.
Is not standard equipment on the tractor (A) and is an option, so in order to use the work reaction force support device (50), a top link (14) incorporating a hydraulic cylinder is separately provided. It was inconvenient to buy.

[0019]

A work reaction force supporting device provided below a working machine connected to a rear portion or a front portion of a working vehicle through a three-point link hitch is provided below the working machine (C). A grader (61) in which an earth-discharging plate (66) is fixedly connected to the tip of a support frame (65) attached to the support frame (6).
5) a support plate (68) having one end fixed thereto, and a rear end rotatably attached to the other end of the support plate (68) with a support pin (69), and a work vehicle (A ) A rocking arm (62) that rotatably supports a ring-shaped contact block (63) that contacts the tire (D), and a grader (61) for rotating the rocking arm (62). ) And a swinging arm (62), a return type hydraulic cylinder (64) is provided between the swing arm (62) and a rear end of the main body of the return type hydraulic cylinder (64). 71) pivotally attaches to the grader (61) and the second end of the piston rod is located at a position beyond the support pin (69) which is the connecting portion between the support plate (68) and the swing arm (62). The first and second pivots (71) (7) are pivotally attached by a pivot (73).
The diameter of one of the first and second support holes (72) and (74) of 3) is made larger than the diameter of the corresponding pivots (71) and (72), and there is some play at the pivotal attachment portion. It is something that will occur.

[0020]

As described above, the return type hydraulic cylinder is interposed between the grader and the swing arm, and the hydraulic cylinder is expanded and contracted, so that the contact block at the tip of the swing arm is applied to the tire of the working vehicle. It is pressed to support the work machine in a stable state.

[0021]

1 to 3 show an example in which a work reaction force supporting device (60) according to the present invention is attached to a backhoe (C) connected to a tractor (A).

The backhoe (C) shown in FIG.
Similar to the one shown in, the auto hitch (20) is attached to the tips of the lower link (13) (13) and the top link (14) of the three-point link hitch (B), and the receiver provided on this auto hitch (20) is attached. The parts (21) and (22) are connected to the tractor (A) by fitting engagement pins (31) and (32) provided on the main frame (30) of the backhoe (C).

The three-point link hitch (B) shown in this figure
The top link (14) is a top link (14) which is a simple link and does not have a built-in hydraulic cylinder that is standard equipment from the beginning in the tractor (A).

The work reaction force supporting device (60) according to the present invention, which is mounted below the main frame (30) of the backhoe (C), is rotatable between the grader (61) and the grader (61). And a swing arm (62) having a contact block (63) at the tip and supported by the swing arm (62).
The main component is a return type hydraulic cylinder (64) for swinging the.

The grader (61) is a support frame (6) fixed to the main frame (30) of the backhoe (C).
5) and an earth removal plate (66) fixed to the tip of the support frame (65).

Further, the method for supporting the swing arm (62) by the grader (61) is the same as the support frame (65) of the grader (61).
And, a bracket (67) having a bifurcated tip as shown in FIGS. 4 and 5 is welded to the soil discharging plate (66).
As shown in FIGS. 6 and 7, a pair of left and right support plates (68) (68) are bolted to both side faces of the support plate (68) (68).
The rear end of the swing arm (62) shown in FIGS. 8 and 9 is swingably supported via the support pin (69) between the front ends of the.

A ring-shaped contact block (63), which is in pressure contact with the tire (D) of the tractor (A) as described above, is rotatably supported at the tip of the swing arm (62).

In order to rotate the swing arm (62), the return type hydraulic cylinder (64) arranged between the bracket (67) of the grader (61) and the swing arm (62) is As shown in FIG. 10, the first pivot (71) protruding from the rear end of the main body to both sides is attached to the bracket (67).
A second pivot (7) inserted through a first support hole (72) bored in the
2) in which 3) is bored at a portion beyond a support pin (69) which is a connecting portion of the swing arm (62) with the support plate (68).
It is supported between the two by inserting it into the support hole (74).

Further, the first and second support holes (72) (7)
Either one of 4), the first support hole (7
The diameter of 2) is set to be larger than the diameter of the first pivot shaft (71) so that some play is generated between them.

The rocking arms (62) are naturally provided on the grader (61) in a pair of left and right, and the rocking arms (6) are
The contact block (63) of 2) faces each tire (D) of the tractor (A).

In the above structure, when the work reaction force support device (60) according to the present invention is not used, the lower link (13) of the three-point link hitch (B) is raised as shown in FIG.
Lift the main frame (30) of the backhoe (C),
Grader (6 below the mainframe (30)
Make the soil discharge plate (66) of 1) separate from the ground, shorten the hydraulic cylinder (64), and swing the arm (62).
Is rotated clockwise in the drawing so that the contact block (63) at the tip of the swing arm (62) contacts the lower surface of the grader (61).

When the work reaction force support device (60) is used, the hydraulic cylinder (64) is first extended from the state shown in FIG. 1, and the swing arm (62) is centered on the support pin (69). It is rotated counterclockwise to move the contact block (63) at the tip of the swing arm (62) toward the tire (D).

Then, as shown in FIG. 2, the first and second pivots (71) (73) of the hydraulic cylinder (64) and the support pin (69) are aligned in a straight line to form a swing arm (62).
Is stopped, this time, the single-acting hydraulic cylinder driving the lower link (13) of the three-point link hitch (B) is made free, and is supported by the three-point link hitch (B). The backhoe (C) is lowered by its own weight, and the contact block (63) is lowered toward the ground.

At this time, the first support hole (72) into which the first pivot shaft (71) is fitted has the first pivot shaft (71).
Since the hydraulic cylinder (64) has a larger diameter and is slightly movable with respect to the grader (61) and the swing arm (62), the swing arm (64) is lowered to the ground. 62) rotates slightly in the figure in the clockwise direction with respect to the grader (61), and the line connecting the pivots (71) and (73) goes above the support pin (69), that is, overcoming the fulcrum.

Thereafter, if the hydraulic cylinder (64) is shortened in this state, the swing arm (62) moves counterclockwise, that is, ascends, and as shown in FIG. While pressing against the D), the earth scavenging plate (66) of the grader (61) is further strongly pressed against the ground to support the backhoe (C) in a stable state.

When the work reaction force support device (60) in the state of FIG. 3 is returned to the state of FIG. 1, the hydraulic cylinder (64) is extended and the swing arm (62) is rotated clockwise in the figure. At the same time as rotating the contact block (63) away from the tire (D), the lower link (1) of the three-point link hitch (B)
3) is lifted and the backhoe (C) is lifted to separate the soil discharging plate (66) of the grader (61) from the ground.

Then, when the swing arm (62) returns to the state shown in FIG. 2 and the swing arm (62) does not move, the hydraulic cylinder (64) is shortened this time.

Then, this time, the own weight of the swing arm (62) causes the swing arm (62) to rotate slightly downward, so that the fulcrum (69) is overcome, and thereafter, the hydraulic cylinder (64). The swing arm (62) pivots toward the grader (61) due to the shortening, and returns to the state shown in FIG.

The work reaction force support device (60) according to the present invention.
Using the grader (61) mounted on the ground, for example, when removing the soil removal plate (66) of the grader (61) to the ground for snow removal work, the contact block () of the swing arm (62) 63) is brought into contact with the ground without contacting the tire (D) and the hydraulic cylinder (64) is locked in this state, the contact block (63) serves as a guide when working with the grader (61). The work can be done smoothly.

[0040]

As described above, according to the present invention, the work reaction force supporting device provided below the working machine connected to the working vehicle through the three-point link hitch, the grader and the contact block are provided. It is composed of an oscillating arm, and a return type hydraulic cylinder is interposed between them, and the pivot shaft supporting this hydraulic cylinder is provided with some play, so that the hydraulic cylinder can be expanded and contracted. The contact block can be pressed against the tire of the work vehicle, and the operability of the work reaction force support device can be greatly improved.

The contact block rotatably supported at the tip of the swing arm can also be used as a guide when the grader is used by adjusting the position of the swing arm with a hydraulic cylinder.

The abutment block rotatably supported at the tip of the swing arm may also be used as a guide for slightly moving the position of the working machine when the working machine is mounted on a working vehicle. it can.

Further, the work reaction force support device according to the present invention causes the contact block to come into pressure contact with the tire of the work vehicle by the action of the built-in hydraulic cylinder. Since it is not necessary to use a top link of a point link hitch that has a built-in hydraulic cylinder, it is possible to use the top link that does not have a built-in hydraulic cylinder that is standard equipment for work vehicles. There is no need to purchase it separately.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a work reaction force support device for a work vehicle according to the present invention is not used.

FIG. 2 is a side view showing a state when the swing arm of the work reaction force support device of the work vehicle according to the present invention is moved.

FIG. 3 is a side view showing a working reaction force supporting apparatus for a working vehicle according to the present invention in use.

FIG. 4 is a side view of a bracket of a work reaction force support device for a work vehicle according to the present invention.

FIG. 5 is a plan view of a bracket of a work reaction force support device for a work vehicle according to the present invention.

FIG. 6 is a side view showing a state in which a support plate is fixed to a bracket of a work reaction force support device for a work vehicle according to the present invention.

FIG. 7 is a bottom view showing a state in which a support plate is fixed to a bracket of a work reaction force support device for a work vehicle according to the present invention.

FIG. 8 is a side view showing a swing arm of a work reaction force support device for a work vehicle according to the present invention.

FIG. 9 is a bottom view showing a swing arm of a work reaction force support device for a work vehicle according to the present invention.

FIG. 10 is a side view showing a work reaction force support device for a work vehicle according to the present invention.

FIG. 11 is a perspective view showing a three-point link hitch mounted on the tractor.

FIG. 12 is a side view showing a conventional example of a work reaction force support device for a work vehicle.

[Explanation of symbols]

 A Tractor B Three-point link hitch C Backhoe D Tire 60 Work reaction force support device for work vehicle 61 Grader 62 Swing arm 63 Abutment block 64 Hydraulic cylinder 65 Support frame 66 Scrap plate 71 First pivot 72 First Support hole 73 Second pivot 74 Second support hole

Claims (1)

(57) [Scope of utility model registration request] 1. A work reaction force support device provided below a work machine connected to a rear part or a front part of a work vehicle via a three-point link hitch, the work reaction force support device comprising: A grader in which an earth-discharging plate is fixedly connected to the tip of a supporting frame attached to the lower part of the working machine, a supporting plate having one end fixed to the supporting frame, and a supporting pin at the other end of the supporting plate. A swing arm having a rotatably attached end and a rotatably supported ring-shaped abutment block abutting against a tire of a working vehicle at a tip thereof, and a grader for oscillating the swing arm. And a swinging arm, a return-acting hydraulic cylinder is provided between the swinging arm and the swing arm. The rear end of the main body of the return-acting hydraulic cylinder is pivotally attached to the grader by the first pivot and the piston rod The tip part is a support pin that is a connecting part between the support plate and the swing arm. The second pivot is pivotally attached to a portion beyond the center, and the diameter of one of the first and second support holes of the first and second pivots is made larger than the diameter of the corresponding pivot. A work reaction force support device for a work vehicle, characterized in that play is slightly generated at the pivot portion.