JP3444445B2 - Front loader support bracket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front loader support bracket for mounting a front loader on a work vehicle such as a tractor.

[0002]

2. Description of the Related Art In general, the front loader generally has a structure in which a pair of left and right lift arms that are hydraulically moved up and down are mounted on the front part of a work vehicle, and an attachment such as a bucket is attached to the tip ends thereof. . FIG. 13 is a diagram showing a configuration of a conventional front loader, and is a side view showing a tractor to which the front loader is attached and a front loader placed in front of the tractor. Tractor 101
On the left and right sides of the rear part of the hood of the car body side bracket 10
3 is attached. The front loader 102 has a pair of left and right lift arms 104, and a pair of left and right arm base frames 105 are vertically swingably attached to the base of the lift arms 104. The lift arm 104 is vertically rocked by a lift cylinder 106 which is supported at a lower position of the arm base frame 105 so as to be vertically rockable.

At the tip of the lift arm 104, an attachment frame 108 is supported by a pin 109 so as to be vertically swingable, and a bucket 111, which is an attachment, is attached to the attachment frame 108. In addition, the dump cylinder 112 is mounted on the lift arm 104.
Is provided in the central portion on the upper side of, and the bucket 111 is vertically swung by the link mechanism 113. Further, a hydraulic control valve 123 attached to the stay 122 is provided at a position on the tractor driver's seat 121 side above the arm base frame 105, and the hydraulic control valve 123 is provided at a position where the driver's right hand can reach.
An operating lever 124 for operating is provided so as to project.

The front loader 102 is attached to the tractor 10
The operation in the case of attaching to No. 1 will be described. First, as shown in FIG. 13, the front loader 102 is erected on the ground by the stand 126, the tractor 101 is advanced toward the front loader 102, and the bonnet is inserted between the lift frames 104. The engaging portion (not shown) of the arm base frame 105 is attached to the vehicle body side bracket 1
The front loader 104 is attached to the tractor 101 by engaging with an engaging portion (not shown) of 03. After that, the hydraulic pipes that drive and control the lift cylinder 106 and the dump cylinder 112 are connected to a connection joint provided at a predetermined position of the tractor 101 via a hydraulic control valve 123.

That is, the hydraulic control valve 1 is installed in the hydraulic circuit for controlling the working machine attached to the rear portion of the tractor 101.
A connection portion (branch portion) for connecting the hydraulic hose from 23 is provided, and the hydraulic piping is connected by connecting each joint of the connection portion and the hydraulic hose. After the connection of the hydraulic pipes is completed, if the front loader 102 uses electricity, the power cord of the front loader 102 is connected to the power connector provided at a predetermined position of the tractor 101, and the front loader 1 is connected.
The work of attaching 02 to the tractor 101 is completed.

[0006] In the conventional tractor 101, the pipe terminal portion serving as the connecting portion is the tractor 1
01 is attached by a pipe terminal mounting bracket provided at a predetermined position of 01, and the power connector is connected to the power cord of the front loader 102 by the tractor 1.
It was attached at a predetermined position of 01. Further, a relief valve housing to which the main relief valve of the tractor side hydraulic circuit is attached is provided at a predetermined position of the tractor 101.

[0007]

However, the conventional front loader mounting structure described above has the following problems. (1) It is necessary to newly provide a mounting bracket for a piping terminal and a relief valve housing, which increases the manufacturing cost due to an increase in the number of parts and the mounting process.

(2) In the work of mounting the front loader 102, the operator has to confirm a plurality of places on the tractor 101, which is complicated and it is necessary to maintain a manual or the like. More specifically,
The operator should confirm that the arm base frame 105 is the vehicle body side bracket 103.
Check that the pipes from the hydraulic control valve 123 are securely connected to the pipe terminal, and if necessary, attach the front connector to the power connector on the tractor side. Checking whether the power cord on the loader side is securely connected, and if necessary, checking whether the relief pressure of the main relief valve on the tractor side is set to the set value. Therefore, it is necessary to mount and check the pipe terminal mounting bracket, the relief valve housing, and the power connector at the location where the mounting terminal mounting bracket, the relief valve housing, and the power supply connector are located, which complicates the work. Especially, conventionally, for each type of tractor, a mounting bracket for piping terminals,
Since the positions of the power supply connector and the relief valve housing are usually different, there is a problem that the mounting and checking work takes time.

(3) Considering from the manufacturer side, when manufacturing the tractor 101 to which the front loader 102 can be mounted, the above-mentioned brackets for piping terminals, relief valve housings, and power supply connectors are mounted at predetermined positions for each model of the tractor. However, there is a problem that the assembly process in manufacturing becomes complicated.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a front loader support bracket which solves the problems described in (1) to (3) above.

[0011]

A front loader support bracket according to a first aspect of the present invention for achieving the above object is, for example, a work vehicle 10 such as a tractor, which will be described with reference to FIGS. 1, 4 and 7. In order to attach the front loader 1 to the work vehicle 10, in the front loader support bracket 11 provided in the work vehicle 10, the front loader support bracket 11 connects the pipe from the hydraulic device 95 of the work vehicle 10 to the pipes 75, 76 on the front loader side. It is characterized by having a piping terminal portion 37 provided with loader side joints 65, 66, 67 connected to 77. A front loader support bracket according to a second aspect of the present invention will be described with reference to FIGS. 1 and 4, for example.
The main relief valve 68 is attached to the front loader support bracket 11.

In the front loader support bracket of the third aspect, for example, referring to FIG. 1 and FIG. 2, the power supply connector 70 connecting the vehicle side power supply cord 80 and the front loader side power supply cord has a front loader support bracket. It is attached to 11. In the front loader support bracket of claim 4, for example, the front loader support bracket 11 is manufactured as an integrally molded product, as described with reference to FIG. Examples of integrally molded products include cast products and forged products.

The front loader support bracket according to the fifth aspect of the present invention will be described, for example, with reference to FIGS. 1 and 7, in which the front loader 1 is lifted up and down by a lift cylinder 6 and a lift arm 2 thereof. Attachment 5 supported on the tip of arm 2 so as to be vertically swingable
And a dump cylinder 7 for swinging the attachment 5 in the vertical direction, and an arm base frame 3 on which the base of the lift arm 2 and the base of the lift cylinder 6 are swingably supported. The arm base frame 3 is detachably attached to the front loader support bracket 11, and pipes communicating with the lift cylinder 6 and the dump cylinder 7 are connected to the loader side joints 65, 66, 67 via a hydraulic control valve 52. It is characterized by that.

[0014]

According to the front loader support bracket of claim 1, since the piping terminal portion 37 is provided in the front loader support bracket 11 which is always confirmed when the front loader 1 is attached to the work vehicle 10, the operator is required to operate the hydraulic load. Connection work can be performed easily without forgetting to attach and detach the pipes. According to the front loader support bracket of claim 2, since the main relief valve 68 of the hydraulic device 95 of the work vehicle 10 is attached to the front loader support bracket 11, it is easy to confirm, adjust and change the relief pressure when the front loader is attached or detached. The work efficiency can be improved as compared with the case where the relief valve 68 is provided at a remote place.

According to the front loader support bracket of the third aspect, the front loader support bracket 11 is surely confirmed when the front loader 1 is attached to the work vehicle 10.
Since the power supply connector 70 that connects the vehicle body side power supply cord 80 and the front loader side power supply cord is attached, it is not necessary to forget to connect the power supply cord when the front loader 1 is attached. Since the front loader support bracket according to claim 4 is manufactured as an integrally molded product, mounting holes 61, 62, 63 for mounting the piping terminal portion 37 and a mounting hole 64 for mounting the main relief valve are provided as shown in FIG. Since the mounting holes 65 for mounting the power supply connector 70 can be manufactured as one unit respectively, the manufacturing cost of the front loader support bracket 11 can be significantly reduced as compared with manufacturing by welding the parts.
Further, by forming the integrally molded product as a cast product, the self-lubricating property can be exhibited, and friction when mounting the front loader 1 can be reduced, so that the mounting work can be made efficient.

According to the front loader support bracket of claim 5, in the front loader 1 having the front loader support bracket 11 and the arm base frame 3 which is detachably attached, the pipe communicating with the lift cylinder 6 and the dump cylinder 7 is hydraulic. Since it is connected to the loader side joints 65, 66, 67 via the control valve 52, the worker can easily perform the connecting work without forgetting to attach or detach the hydraulic pipe.

[0017]

As described in the above operation, according to the invention of claim 1, the following unique effects (a) to (c) can be obtained. (B) Since the front loader support bracket also serves as the piping terminal portion, the number of parts can be reduced. (B) When installing the front loader, the front loader support bracket, which must be checked by the operator when installing the front loader, has a piping terminal section, so that the piping connection work is made more efficient and Never forget to connect. (C) When manufacturing a work vehicle to which the front loader is attached, the piping terminal portions can be collected and manufactured in one place, so that the assembly process can be simplified and the manufacturing cost can be reduced.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, it is possible to easily confirm, adjust and change the relief pressure when the front loader is attached and detached, and the relief valve is installed at a remote place. It has a unique effect that the work efficiency can be improved as compared with the case where it is provided. According to the invention of claim 3, in addition to the effect of the invention of claim 1,
The power supply connector is attached to the front loader support bracket, which must be checked by the operator when installing the front loader, which further improves work efficiency and forgets to connect the power cord when installing the front loader. It has a unique effect that it disappears.

According to the invention of claim 4, in addition to the effects of the invention of any one of claims 1 to 3, the following unique effects (c) and (d) can be obtained. (C) Since the relief valve mounting hole, the mounting hole for providing the piping terminal portion, and the mounting hole for mounting the power supply connector can be manufactured as a single component as a single component, the manufacturing cost of the front loader support bracket can be reduced. (D) Since the front loader support bracket is formed as an integrally molded product, the appearance of the tractor can be made more beautiful than in the conventional front loader support bracket manufactured by repeatedly welding and cutting a plurality of parts.

According to the invention of claim 5, in addition to the effect of the invention of any one of claims 1 to 4, a front loader having a lift arm, a lift cylinder, a dump cylinder, an attachment, and an arm base frame. In, there is a peculiar effect that the effect of the invention according to any one of claims 1 to 4 can be obtained.

[0021]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 7 is a diagram showing a configuration of a tractor to which a vehicle body side bracket according to the present invention is attached and a configuration of a front loader attached to the tractor, and is a side view showing a state before attaching the front loader to the tractor. As shown in FIG. 7, the front loader 1 is attached to a pair of left and right lift arms 2, a pair of left and right arm base frames 3 attached to the base end sides of the lift arms 2, and a tip end side of the lift arm 2. A pair of left and right attachment frames 4, a bucket 5 detachably attached to the attachment frame 4, a pair of left and right lift cylinders 6 for vertically swinging the lift arm 2, and a left and right pair for vertically swinging the bucket 5. And a pair of left and right link mechanisms 8 including a dump cylinder 7, a connecting rod 20, and a crank 22.

The vehicle body side brackets 11 are attached to the left and right sides of the bonnet rear portion of the vehicle body 10a of the tractor 10, and the arm base frame 3 is detachably attached to the vehicle body side brackets 11 to attach the front loader 1 to the front loader 1. It is configured to be detachably attached to the vehicle body 10a. That is, the arm base frame 3 has a mounting hole 43 and a convex arc-shaped engaging portion 42, and the vehicle body side bracket 11 has a mounting hole 32 provided corresponding to the mounting hole 43. A concave arc-shaped engaging portion 35 that engages with the convex arc-shaped engaging portion 42 is provided. Then, by rotating the arm base frame 3 counterclockwise with the convex arc-shaped engaging portion 42 engaged with the concave arc-shaped engaging portion 35, the two mounting holes 43 and 32 are aligned, Mounting hole 4
The pins 3 and 32 are fixed by inserting and removing pins.

The lift arm 2 has a curved shape that is slightly closer to the base end side, and its base end is supported by a pin 12 at an upper position of the arm base frame 3 so as to be vertically swingable. The tip of the lift arm 2 is supported by a pin 13 on the attachment frame 4 so as to be vertically swingable.
The base of the lift cylinder 6 is swingably supported at the front side position of the arm base frame 3 by the pin 14, and the tip of the lift cylinder 6 is vertically swingably attached to the center of the lift arm 2 by the pin 15. further,
The hydraulic control valve 52 of the front loader 1 is attached by the attachment 51.
Is attached at a predetermined position above the arm base frame 3. The hydraulic control valve 52 is operated by the operation lever 53.

FIG. 8 (a) is a front view of the vehicle body side bracket 11, and FIG. 8 (b) is a view taken along the line AA in FIG. 8 (a). The vehicle-body-side bracket 11 is a plate-shaped product manufactured by an integrally molded product, for example, a cast product made of iron, and a rib 31 that enhances strength is formed on an edge portion. Further, a pipe terminal portion 37 is provided at a vehicle body rear side middle position of the vehicle body side bracket 11. The piping terminal portion 37 is the tractor 1
Mounting hole 61 to which the joint from the 0 hydraulic pump is attached
A mounting hole 62 for mounting a joint to the downstream control valve of the front loader 1, a mounting hole 63 for mounting a joint from the hydraulic tank of the tractor 10, a mounting hole 64 for mounting a relief valve, and a power connector. And a mounting hole 60 to be mounted. Further, the vehicle body side bracket 11 has a projecting engagement portion 33 provided at an upper end position thereof and having a pin hole 32, and a concave arcuate engagement portion 3 provided at a vehicle body front lower position and guided by a projecting guide portion 34.
5 and 5.

FIG. 1 is a view showing the state of the vehicle body side bracket when the front loader is completely attached to the tractor, FIG. 2 is a side view of the state seen from the rear of the tractor, and FIG. 3 is the front loader separated from the tractor. It is a figure which shows the state of the vehicle body side bracket at the time. The mounting holes 61, 62, 63 are provided in the piping terminal portion 37 on the outer surface of the vehicle body side bracket 11.
A pump side joint 65, a downstream side control valve side joint 66, and a tank side joint 67 are attached to each (not shown), and a tractor side main relief valve 68 is attached to the relief valve attachment hole 64.

A power connector 70 is attached to the attachment hole 65. On the other hand, the hydraulic control valve 52 is provided with a pump side joint 71, a downstream control valve side joint 72, and a tank side joint 73, respectively. Therefore, each joint 65, 66, 67 and each joint 71, 72, 73
Are connected to each other by a pump hose 75 having connecting means at both ends, a downstream control valve hose 76, and a tank hose 77, so that hydraulic pipes on the front loader side and the tractor side can be connected. . The tank hose 77, the hose end of the downstream control valve hose 76 on the piping terminal 37 side, and the hose end of the pump hose 75 on the hydraulic control valve 52 side are detachable hydraulic coupler 77a and hydraulic coupler 76a, respectively. And a hydraulic coupler 75a is attached. A check valve is attached to each coupler to prevent oil leakage before connection.

In FIG. 2, reference numeral 80 is a power cord on the tractor side connected to the power connector 70. Figure 4
6 to FIG. 6 are diagrams showing the connection states of the tractor and the front loader by hydraulic circuits. FIG. 4 is a hydraulic circuit diagram when the front loader is attached to the tractor in a configuration in which the front loader is connected downstream of the tractor side main relief valve 68, and FIG. 5 is the tractor side main relief valve 68.
FIG. 6 is a hydraulic circuit diagram when the front loader is detached from the tractor in a configuration in which the front loader is connected downstream of the tractor. FIG. 6 shows the front loader as the tractor when the front loader is connected upstream of the tractor-side main relief valve 68. It is a hydraulic circuit diagram when it is attached. The hydraulic circuit on the front loader side in FIGS. 5 and 6 is the same as the hydraulic circuit on the front loader side shown in FIG.
The description is omitted.

In FIGS. 4 to 6, the portion surrounded by the chain double-dashed line shows the tractor side hydraulic circuit 95, and the others are the front loader side hydraulic circuit. The tractor-side hydraulic circuit 95 includes a hydraulic pump 81, a hydraulic control valve 82 for a tractor working machine (an original working machine provided at the rear of the tractor), an oil tank 83, and a tractor-side main relief valve 68.
And have. The hydraulic circuit on the front loader side is connected to a lift selection switching valve 86 for selecting a lifting / lowering operation by the lift cylinder 6, a dump selection switching valve 87 for selecting a dumping / squeezing operation by the dump cylinder 7, and a pump side joint 71. And a front loader-side main relief valve 90 provided so as to communicate between the pipe 88 and the pipe 89 connected to the tank-side joint 73. In addition,
In this hydraulic circuit, the set pressure of the front loader-side main relief valve 90 is set lower than that of the tractor-side main relief valve 68 so that the lifting force of the front loader is constant.

Next, the operation of the vehicle body side bracket of the front loader and the tractor having the above construction will be described. First, when attaching the front loader to the tractor, the tractor 10 is moved forward and the bonnet is inserted between the lift arms 2 in a state where the arm base frame 3 is erected on the ground by the stand 23 as shown in FIG. And
By rotating the arm base frame 3 counterclockwise with the convex arcuate engagement portion 42 engaged with the concave arcuate engagement portion 35, the two attachment holes 43 and 32 are aligned and attached. By fixing the holes 43 and 32 with the insertion and removal pins, the arm base frame 3 is fixed to the vehicle body side bracket 11.
Mechanically attach to.

After that, the hydraulic piping is connected as follows. First, in a state before the front loader 1 is attached to the tractor 10, as shown in FIG. 3, the pump side joint 65 of the vehicle body side bracket 11 and the downstream side control valve side joint 66 are connected to the hydraulic coupler 75 of the pump hose 75.
a is connected to the downstream side control valve side joint 66 to communicate with each other, and the pump side joint 71 and the downstream side control valve side joint 72 of the hydraulic control valve 52 are connected to the hydraulic coupler 76 of the downstream side control valve hose 76.
a is connected to the pump side joint 71, and the tank hose 77 is connected to the tank side joint 73 of the hydraulic control valve 52, and the locking portion 9 of the hydraulic control valve 52 is connected.
2, the hydraulic coupler 77a is locked.
In this state, as shown in FIG. 5, the working machine (not shown) of the tractor body is in a state in which the hydraulic pressure from the hydraulic pump 81 is supplied to the tractor working machine control valve 82, and is provided at the rear portion of the tractor. The work machine can perform work, and the hydraulic circuit on the front loader side is in a closed state.

When attaching the front loader to the tractor, as shown in FIG. 1, the pump side joint 71 on the front loader side, the downstream side control valve side joint 72, the tank side joint 73 and the pump side joint 65 of the vehicle body side bracket 11, By connecting the downstream side control valve side joint 66 and the tank side joint 67 by the pump hose 75, the downstream side control valve hose 76 and the tank hose 77, respectively, the hydraulic pipes on the front loader side and the tractor side are connected. In this case, since the piping terminal portion 37 is provided on the vehicle body side bracket 11 itself, it is possible to easily perform the hydraulic pipe connecting work without forgetting all the piping. Further, since the tractor side main relief valve 68 is provided on the vehicle body side bracket 11, the set pressure can be easily confirmed, adjusted and changed.
Further, since the power supply connector 70 is provided on the vehicle body side bracket 11, electrical connection can be performed without forgetting a continuous flow of the mechanical attachment and hydraulic connection.

In this way, the body side bracket, which is a mechanical connection point, and the piping terminal section, which is a hydraulic connection section,
By collectively providing the power supply connector that is the electrical connection portion, the manufacturer can simplify the manufacture of the tractor, and also the worker who uses the front loader can efficiently perform the mounting and connecting work. Next, how to engage the arm base frame 3 in the vehicle body bracket 11 used in this embodiment will be described.

FIG. 9 (a) is a front view of the arm base frame, FIG. 9 (b) is a view taken along the line BB in FIG. 9 (a),
FIG. 9C is a vertical cross-sectional view taken along the line CC of FIG. 9B. The arm base frame 3 is a plate-shaped product manufactured by an integrally molded product, for example, a cast product made of iron, and ribs 40 that enhance the strength are formed on the surface and the edge portion. In addition,
Examples of iron castings include gray cast iron, spheroidal graphite cast iron, and black core malleable cast iron. The arm base frame 3 is provided with a vertically elongated concave portion 41 for accommodating the protruding engagement portion 33 of the vehicle body side bracket 11 inside the end surface on the rear side of the vehicle body. A convex arc-shaped engaging portion 42 that engages with the arc-shaped engaging portion 35 is provided. Pin holes 43 for inserting / removing pins for attaching the arm base frame 3 to the vehicle-body-side bracket 11 are provided on both upper side walls of the vertically elongated recess 41 so as to pass through the vertically recessed portion 41 in the horizontal direction.

A guide edge for positioning the pin hole 32 of the vehicle body side bracket 11 and the pin hole 43 of the arm base frame 3 by abutting the protruding engagement portion 33 of the vehicle body side bracket 11 on the back wall of the vertically elongated recessed portion 41. A section 45 is provided. A pin hole 46 for mounting the lift arm 2 is provided at an upper end position of the arm base frame 3, and the base part of the lift arm 2 is supported by a pin 12 (see FIG. 7) so as to be vertically swingable. Further, a pin hole 47 for mounting the lift cylinder 6 is provided at a lower position of the arm base frame 3 on the front side of the vehicle body.
4 (see FIG. 7) so as to be swingable up and down.

10 to 12 are views showing a procedure for mounting the arm base frame 3 on the vehicle body side bracket 11, respectively. First, as shown in FIG. 10, the convex arc-shaped engaging portion 42 is locked to the projecting guide portion 34 of the vehicle body side bracket 11, and the arm base frame 3 is slid in the arrow direction to form a concave portion as shown in FIG. The convex arcuate engagement portion 42 is fitted into the arcuate engagement portion 35. From that state, as shown in FIG. 11, the arm base frame 3 is rotated counterclockwise around the convex arcuate engagement portion 42 as a center point.
Then, as shown in FIG. 12, the protruding engagement portion 33 of the vehicle body side bracket 11 is inserted into the vertically elongated recess 41 of the arm base frame 3 and abuts against the guide edge portion 45, thereby positioning both pin holes 32 and 43. it can. Then, the arm base frame 3 can be attached to the vehicle body side bracket 11 by penetrating the pin hole 32 of the vehicle body side bracket 11 from the pin hole 43 of the arm base frame 3 and attaching the insertion / removal pin. In this case, the arm base frame 3 is positioned by the concave arc-shaped engagement portion 35 and the insertion / removal pin, and is supported by the vehicle body side bracket 11 by the convex arc-shaped engagement portion 42 and the guide edge portion 45.

The operation shown in FIGS. 10 to 12 is specifically performed as follows. That is, as shown in FIG. 7, the front loader 1 to be mounted is erected on the ground by the stand 23 and the bucket 5 is installed on the surface of the ground.
Advance the tractor 10 toward the front loader 1,
The hood of the tractor 10 is located between the pair of lift arms 2. Then, with the body side bracket 11 and the arm base frame 3 in close proximity, the lift cylinder 6
Also, the hydraulic pipe of the dump cylinder 7 is connected to each joint of the pipe terminal portion 37 via the hydraulic control valve 52. Then, the extending operation of the dump cylinder 7 mainly achieves the sliding operation shown in FIG. 10, and the mainly shortening operation of the lift cylinder 6 achieves the rotating operation shown in FIG. In this way, the arm base frame 3 is attached to the vehicle body side bracket 11 by appropriately driving the lift cylinder 6 and the dump cylinder 7 individually or in combination as appropriate.

The present invention is not limited to the above embodiments, and various design changes can be made within the scope of the present invention. Hereinafter, such an embodiment will be described. (1) The external shapes of the vehicle body side bracket 11 and the arm base frame 3 shown in FIGS. 8 and 9 in the above embodiment are merely examples, and various shapes are possible by design changes. (2) In the above embodiment, the tractor-side main relief valve 68 is mounted on the side end surface of the vehicle body-side bracket 11, but the mounting position can be changed appropriately. In the above embodiment, the power connector 7
0 is provided below the piping terminal portion 37,
The power connector 70 is provided on the upper side, and the piping terminal portion 37
May be provided on the lower side.

(3) When the front loader that does not use the power connector 70 and the front loader are not installed, it is better to install a cover that prevents dust and the like from adhering to the power connector 70. (4) Further, a bolt hole for attaching the rearview mirror may be integrally formed in the empty space of the vehicle body side bracket 11. In this case, the rearview mirror can be attached to the vehicle body side bracket 11, and the rearview mirror assembling process in manufacturing the tractor can be simplified.

[Brief description of drawings]

FIG. 1 is a view showing a state of a vehicle body side bracket when mounting of a front loader on a tractor is completed.

FIG. 2 is a side view of the state of FIG. 1 viewed from the rear of the tractor.

FIG. 3 is a view showing a state of a vehicle body side bracket when a front loader is detached from a tractor.

FIG. 4 is a diagram showing a hydraulic circuit in a connection state between a tractor and a front loader.

FIG. 5 is a diagram showing a hydraulic circuit in a disengaged state between a tractor and a front loader.

FIG. 6 is a view showing a hydraulic circuit in a connection state between a tractor and a front loader.

FIG. 7 is a diagram showing a configuration of a tractor to which a vehicle body side bracket according to the present embodiment is attached and a configuration of a front loader attached to the tractor.

8A is a front view of a vehicle body side bracket, and FIG. 8B is a view taken along the line AA in FIG. 8A.

9A is a front view of an arm base frame, FIG. 9B
Is a view taken along the line BB in (a), and (c) is a vertical sectional view taken along line C-C in (b).

FIG. 10 is a diagram showing a procedure for attaching the arm base frame to the vehicle body side bracket.

FIG. 11 is a diagram showing a procedure for attaching the arm base frame to the vehicle body side bracket.

FIG. 12 is a diagram showing a procedure for attaching the arm base frame to the vehicle body side bracket.

FIG. 13 is a view showing a configuration of a conventional front loader, and is a side view showing a tractor to which the front loader is attached and a front loader placed in front of the tractor.

[Explanation of symbols]

1 ... Front loader, 2 ... Lift arm, 3 ... Arm base frame, 5 ... Bucket, 6 ... Lift cylinder, 7 ...
Dump cylinder, 10 ... tractor, 11 ... Vehicle side bracket, 37 ... Piping terminal portion, 52 ... Hydraulic control valve, 6
5 ... Pump side joint, 66 ... Downstream side control valve side joint, 67 ... Tank side joint, 68 ... Tractor side main relief valve, 70 ... Power connector, 75 ... Pump hose,
76 ... Downstream control valve hose, 77 ... Tank hose, 80 ... Tractor side power cord, 95 ... Tractor side hydraulic circuit.

Claims (5)

(57) [Claims] 1. A front loader support bracket (11) provided on a work vehicle (10) for mounting the front loader (1) to the work vehicle (10) such as a tractor, wherein the front loader support bracket (11). Is equipped with loader side joints (65) (66) (67) for connecting pipes from the hydraulic device (95) of the work vehicle (10) to pipes (75) (76) (77) on the front loader side. A front loader support bracket having a piping terminal portion (37). 2. A hydraulic system (9) for the work vehicle (10).
The front loader support bracket according to claim 1, wherein the main relief valve (68) of 5) is attached. 3. The front loader support bracket according to claim 1, further comprising a power connector (70) for connecting the vehicle-side power cord (80) and the front loader-side power cord. 4. The front loader support bracket according to claim 1, which is manufactured by an integrally molded product. 5. The front loader (1) is vertically swingably supported by a lift arm (2) which is vertically swung by a lift cylinder (6) and a tip portion of the lift arm (2). Attachment (5), a dump cylinder (7) for swinging the attachment (5) in the vertical direction, a base of the lift arm (2) and a base of the lift cylinder (6) are vertically swingable. An arm base frame (3) to be supported, the arm base frame (3) being detachably attached to the front loader support bracket (11), the lift cylinder (6), the dump cylinder ( 7. The pipe communicating with 7) is connected to the loader side joints (65) (66) (67) via a hydraulic control valve (52). Front loader support bracket described in.