JPH0658304A - Hydraulic device for tractor or the like - Google Patents

Abstract

PURPOSE:To facilitate operation and simplify constitution by realizing hydraulic hose quick coupler connection at an auxiliary work device by the coupling/ separation of the quick couplers of high pressure rubber hoses at a main hydraulic circuit. CONSTITUTION:A hydraulic device to a tractor or the like is made up by making parts of a main hydraulic circuit to operate a lift cylinder, high pressure rubber hoses 3 and by making coupling/separation free by means of quick couplers 4, 5 that open the middle or one end of the high pressure hoses 3 by means of insertion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic system for hydraulically raising and lowering a working machine mounted on a vehicle body such as a tractor. The hydraulic system for raising and lowering a combine harvester and a seedling planting machine for rice transplanters are raised and lowered. It can also be used for hydraulic systems that operate.

[0002]

2. Description of the Related Art A hydraulic circuit of a lift cylinder is used as a main hydraulic circuit, and an auxiliary hydraulic circuit for operating an auxiliary work machine is connected or disconnected to perform auxiliary work. In many cases, the auxiliary hydraulic circuit can be attached to such a main hydraulic circuit by connecting a specially prepared hydraulic pipe or by preventing oil eyes from leaking from the hydraulic circuit. Such as providing a switching valve to switch the hydraulic circuit,
The configuration is complicated and the operation is troublesome. Also, there are many oil leaks.

[0003]

According to the present invention, a high-pressure rubber hose 3 is used as a part of a main hydraulic circuit 2 for operating a lift cylinder 1, and a quick opening is performed by inserting one end or the middle of the high-pressure rubber hose 3 by insertion. A hydraulic device such as a tractor, which is provided with couplers 4 and 5 so as to be joined and separated, is used.

[0004]

The hydraulic pump is transmitted by the drive of the engine, and the oil from the hydraulic pump is sent to the lift cylinder 1 through the main hydraulic circuit 2 to hydraulically raise and lower the working device with respect to the vehicle body. You can When connecting the auxiliary hydraulic circuit for operating the auxiliary work device 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, these 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 integrated with the high pressure rubber hose 3, so The directionality of the coupler 4 is free, and the operation of detaching it from the other quick coupler 5 is easy.
On the contrary, the mounting operation is similarly easy. By connecting the quick couplers of the hydraulic hoses on the side of the auxiliary work device to the two quick couplers 4 and 5 thus separated, the hydraulic operation of the lift cylinder 1 as well as the hydraulic operation of the auxiliary work device is performed. It can be carried out.

As described above, the quick coupler of the hydraulic hose of the auxiliary working device can be connected at the joining / separating portion of the quick couplers 4 and 5 of the high-speed rubber hose 3 of the main hydraulic circuit 2, which is easy to operate and has a structure. It's easy.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A tractor vehicle body 6 includes a front wheel E, a front housing 10 and a clutch housing 7, a transmission case 8 and a rear transmission case 9 which are integrally connected to each other.
The steering wheel 11 is steerable, has rear wheels 12, and is in a four-wheel drive mode. It is vertically rotated by a hydraulic case 13 on the 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 thereof. A working device such as a tiller 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 vertically rotating the lift arm 14.

The engine E is provided so as to drive a hydraulic pump P. From the hydraulic pump P, the hydraulic pipe 1 is connected.
7 is connected to a shunt valve 18 attached to one side of the clutch housing 7, and between the shunt valve 18 and the lift control valve 19 of the hydraulic case 13,
It is connected by a flexible high-pressure rubber hose 3. 20 is a relief valve, 21 is a PTO clutch for the power take-off shaft, 22
Is a pressure control 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. .

On the valve block 30 of the flow dividing valve 18, a convex quick coupler 5 is provided to project rearward, and a ring groove 31 is formed on the outer peripheral portion of the tip of the quick coupler 5. A rear end 32 of the flexible high-pressure rubber hose 3 is inserted and connected to the hydraulic case 13 side, and a concave quick coupler 4 is provided at a front end 33 of the inner peripheral surface of the quick coupler 4. O-ring 34 formed on
Is fitted into the ring groove 31 of the quick coupler 5, so that the quick couplers 4 and 5 are connected to each other.
In this connected state, the tip valves at the tips of both quick couplers 4 and 5 are pushed open to allow oil to flow. When both couplers 4 and 5 are removed, the tip valves are closed to prevent leakage of oil inside.

A front loader 35 is used for such a tractor.
When installing, attach this control unit 36 to the dashboard and
6 control valve 37, high pressure rubber hose 38,
High pressure rubber hose 38 having 39 and connecting to the inlet 40 side
Has a concave quick coupler 42 connected to the convex quick coupler 5 of the valve block 30,
At the tip of the high-pressure rubber hose 39 connected to the outlet 41 side, there is provided a convex-side quick coupler 43 connected to the concave-side quick coupler 4 of the high-pressure rubber hose 3, and the quick couplers 4 and 5 are removed to remove this quick coupler. The quick coupler 42 on the inlet 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 way, by mounting the front loader 35 and operating the control valve 37 with the operating lever 44, the flow dividing valve 18 is connected to the high pressure rubber hose 3.
The oil supplied to the control valve 37 via 8 is the cylinder port 4 of the control valve 37.
5,46 is sent to a lift cylinder 47 and a scooping cylinder 48 that are connected to the hoses 5 and 46, and the loader work can be performed by expanding and contracting these cylinders 47 and 48. At this time, the oil used for the loader work 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, the high pressure rubber hose 3, etc.
The lift arm 14 is controlled up and down by the operation. The oil that has passed through the lift control valve 19, the lift cylinder 1 or the like is reduced as lubricating oil for the transmission case 9 or the transmission case 8 that is the tank port T, and is pumped up again by the hydraulic pump P.

When the front loader 35 is removed from the vehicle body 6, the quick coupler 4 of each high pressure hose 38, 39 is used.
Remove 2,43 from the quick couplers 5,4,
These quick couplers 5 and 4 are directly connected.

[Brief description of drawings]

FIG. 1 is a hydraulic piping diagram of essential parts.

FIG. 2 is a side view of a part of the 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 portion.

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]

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

Claims (1)

[Claims] 1. A high-pressure rubber hose 3 is part of a main hydraulic circuit 2 for operating a lift cylinder 1, and one end or a middle portion of the high-pressure rubber hose 3 can be joined and separated by quick couplers 4 and 5 which are opened by insertion. A hydraulic device such as a tractor provided in the.