JP3287021B2 - Hydraulic circuit of working machine in tractor etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic device for raising and lowering a work machine mounted on a vehicle body such as a tractor by hydraulic pressure, and more particularly to a hydraulic device for raising and lowering a combine harvester and a raising and lowering seedling device for a rice transplanter. It can also be used for hydraulic devices and the like.

[0002]

2. Description of the Related Art A hydraulic circuit of a lift cylinder uses a main hydraulic circuit as a main hydraulic circuit to connect and remove an auxiliary hydraulic circuit for operating an auxiliary working machine, thereby providing auxiliary work. In many cases, a specially prepared hydraulic pipe can be connected to the sub-hydraulic circuit for such a main hydraulic circuit. Means such as providing a switching valve for switching the hydraulic circuit,
The configuration is complicated and the operation is troublesome. There are also many oil leaks.

[0003]

The present invention is mounted on a vehicle body.
Work machine that moves up and down by the operation of the hydraulic cylinder 1
In Kuta like, a part of the main hydraulic circuit 2 for actuating the hydraulic cylinder 1 as high pressure rubber hose 3, one end or the middle of the high-pressure rubber hose 3, the oil passage by disconnecting
To open and close one freely junction isolation set <br/> only that the quick couplers 4,5, to the auxiliary working machine 35 to be attached to the vehicle body, this
To the hydraulic cylinders 47 and 48 on the auxiliary work machine 35 side
Control valve 37 and operation of the valve 37
The operation lever 44 is formed as a unit, and the valve 3
7 assists in joining with the ends of the quick couplers 4 and 5
Work machine side quick couplers 42 and 43 are provided to
When attaching the work machine 35 to the vehicle body,
Auxiliary work machine side quick coupler 42 between pullers 4 and 5
43 to connect the main hydraulic circuit 2 to the control
A hydraulic circuit for a working machine in a tractor or the like , wherein a sub hydraulic circuit having a valve 37 is connected .

[0004]

In the hydraulic circuit of the working machine in the tractor or the like configured as described above, the oil from the hydraulic pump is sent to the hydraulic cylinder 1 through the main hydraulic circuit 2 and the working machine is Can be raised and lowered hydraulically.
When connecting the auxiliary hydraulic circuit for operating the auxiliary work machine to the main hydraulic circuit 2, the connection between the quick couplers 4 and 5 of the high-pressure rubber hose 3 is removed. At this time, the quick couplers 4 and 5 are immediately closed so that the oil inside does not flow out from the opening, and one quick coupler 4 is integral with the high-pressure rubber hose 3. The directionality of the coupler 4 is free, and the operation of removing the coupler 4 from the other quick coupler 5 is easy. Conversely, the mounting operation is similarly easy. For the two quick couplers 4 and 5 thus separated,
By connecting the quick couplers 42, 43 on the auxiliary working machine side, the hydraulic cylinders 47, 48 on the auxiliary working machine side are connected.
Along with the operation, the hydraulic cylinder 1 on the vehicle body side can also be driven.

As described above, the quick couplers 42 and 43 on the auxiliary working machine side can be connected at the joint separating portion of the quick couplers 4 and 5 in the high-pressure rubber hose 3 of the main hydraulic circuit 2 so that the operation is easy and the configuration is simple. Is easy. When the auxiliary work machine is mounted, the control valve 37 operates the operation lever 44 for operating the auxiliary work machine.
And the unit configuration, the number of mounting steps can be simplified.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tractor body 6 is constructed by integrally connecting a clutch housing 7, a transmission case 8, a rear transmission case 9 and the like from a front engine E body to a front wheel 10;
Is steerable by a steering wheel 11, has a rear wheel 12, and is in a four-wheel drive mode, and is vertically turned by a hydraulic case 13 on a rear transmission case 9 and a lift cylinder 1 in the hydraulic case 13. And a driver's seat 16 between the left and right fenders 15 at the upper part. A working device such as a tilling device connected to the rear side of the transmission case 9 by a lower link, a top link, or the like can be moved up and down by rotating the lift arm 14 up and down.

[0007] The engine E is provided with a hydraulic pump P to be driven.
7, is connected to a flow dividing valve 18 attached to one side of the clutch housing 7, and the flow path between the flow dividing valve 18 and the lift control valve 19 of the hydraulic case 13 is
The connection is made with a flexible high-pressure rubber hose 3. 20 is a relief valve, 21 is a PTO clutch for a power take-off shaft, 22
Is a pressure regulating valve in the flow dividing valve 18, 23 is an oil filter, 24 and 25 are unload valves, 26 is a check valve, 27 is a pilot spool, 28 is a slow return check valve, 29 is a relief valve, and T is a tank port. .

A quick coupler 5 protruding rearward is protruded from a valve block 30 of the flow dividing valve 18, and a ring groove 31 is formed in an outer peripheral portion of a tip of the quick coupler 5. Also, the rear end 32 of the flexible high-pressure rubber hose 3 is inserted and connected to the hydraulic case 13 side, and the front end 33 has a concave quick coupler 4. O-ring 34 formed on
Is fitted in the ring groove 31 of the quick coupler 5 to connect the two quick couplers 4 and 5 to each other.
In this connection state, the tip valves at the tip portions of the quick couplers 4 and 5 are pushed open to allow oil to flow. When both couplers 4 and 5 are removed, the end valves are closed to prevent leakage of oil inside.

A front loader 35 is mounted on such a tractor.
When mounting the control unit 36, the control unit 36 is attached to the dashboard, and the control unit 3 is mounted.
6, a high-pressure rubber hose 38,
High pressure rubber hose 38 having an inlet 39
Has a concave quick coupler 42 connected to the convex quick coupler 5 of the valve block 30,
At the end of the high-pressure rubber hose 39 connected to the outlet 41 side, a convex quick coupler 43 connected to the concave quick coupler 4 of the high-pressure rubber hose 3 is provided. A quick coupler 42 on the entrance 40 side is inserted and connected to the coupler 5,
The quick coupler 43 on the outlet 41 side is inserted and connected to the quick coupler 4.

In this manner, by attaching the front loader 35 and operating the control valve 37 with the operation lever 44, the high pressure rubber hose 3
8 is supplied to the control valve 37 via the cylinder port 4 of the control valve 37.
It is sent to the lift cylinder 47 and the scooping cylinder 48 which are connected to the hoses 5 and 46, and the loader work can be performed by the expansion and contraction of these cylinders 47 and 48. At this time, the oil used for the loader operation flows from the high-pressure rubber hose 39 to the lift control valve 19 of the hydraulic case 13 via the quick couplings 43 and 4 and the high-pressure rubber hose 3 and the like.
The lift arm 14 is controlled to move up and down by the operation. The oil that has passed through the lift control valve 19 or the lift cylinder 1 and the like is reduced as lubricating oil for the transmission case 9 and the transmission case 8 as the tank port T, and is pumped again by the hydraulic pump P.

When the front loader 35 is detached from the vehicle body 6, the quick coupler 4 of each of the high-pressure hoses 38, 39 is used.
Pull out 2,43 from quick couplers 5,4,
These quick couplers 5 and 4 are directly connected.

[Brief description of the drawings]

FIG. 1 is a hydraulic piping diagram of a main part.

FIG. 2 is a side view of a part of a tractor vehicle body.

FIG. 3 is a plan view of a part thereof.

FIG. 4 is a plan view of a high-pressure rubber hose part.

FIG. 5 is a hydraulic circuit diagram.

FIG. 6 is a side view of the tractor.

FIG. 7 is a side view of the tractor to which the front loader is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lift cylinder 2 Main hydraulic circuit 3 High pressure rubber hose 4 Quick coupler 5 Quick coupler

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F15B 11/00-11/06 F15B 11/08-11/22 A01B 59/00-59/06 A01B 63 / 10 B60K 25/04

Claims (1)

(57) [Claims] A working machine mounted on a vehicle body is a hydraulic cylinder.
In a tractor or the like that moves up and down by the operation of the above, a part of the main hydraulic circuit 2 for operating the hydraulic cylinder 1 is a high-pressure rubber hose 3, and a quick coupler that opens and closes an oil passage by inserting and removing one end or an intermediate portion of the high-pressure rubber hose 3. while Ru provided freely junction isolation at 4,5, to the auxiliary working machine 35 to be attached to the vehicle body, the auxiliary working
For supplying hydraulic pressure to the hydraulic cylinders 47 and 48 on the side of the machine 35
Control valve 37 and the operating lever 4 of the valve 37
4 as a unit, and the valve 37
Auxiliary work machine side to be joined to the end of
The Ikkukapura 43 is provided, when mounting the auxiliary working machine 35 to the vehicle body, the click
Auxiliary work machine side quick coupler between ICK couplers 4 and 5
-42, 43 and connect the main hydraulic circuit 2 to the
A hydraulic circuit for a working machine in a tractor or the like , wherein a sub hydraulic circuit having a troll valve 37 is connected .