JPH025682Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the arrangement of a hydraulic system for an agricultural tractor, particularly a line filter, which is an oil filter installed in the middle of a hydraulic pipe.

Agricultural tractors are devices that perform agricultural work by attaching other working machines to the rear, and various hydraulic devices are used depending on the purpose.

These include hydraulic systems for lifting and lowering work equipment, hydraulic systems for power steering systems, hydraulic systems for power shifting, etc.

Among these, the hydraulic pressure for power shift is 10 to 20 kg/
cm ² , but the other two, the hydraulic pressure for lifting and lowering the work equipment and the hydraulic pressure for the power steering device, are both 80
It is about Kg/cm ² to 120Kg/cm ² and can be shared.

However, if this is shared, the amount of hydraulic oil will increase, and the capacity will be insufficient if the only hydraulic oil strainer is the oil filter inside the transmission case. If you try to install an oil filter with a large capacity and a wide filter net area inside the transmission case,
Due to the relationship with the gear, space is lost, and a large line filter must be installed in the middle of the pipe outside the transmission case.

However, when a line filter is provided protruding from the side wall of a transmission case, it is likely to come into contact with an obstacle and damage the pipe and the filter itself, so it has not been installed very often in the past.

The present invention takes this point into consideration, strengthens the steps on the sides of the transmission case, uses them as a protector for the line filter, and even attempts to make it into a housing to cover and store the line filter. be.

The purpose of the present invention is as described above, and the structure of the technology of the present invention will be explained in detail based on the structure of the attached embodiment.

FIG. 1 is an overall side view of the tractor.

An engine 21 is disposed inside a bonnet 38, and a front wheel 39 is mounted on a front frame 40 projecting from the lower side of the engine 21. The engine 2
A clutch housing 22 is fixed to the rear surface of the clutch housing 22, and a transmission case 35 is fixed to the rear surface of the clutch housing 22.

Furthermore, a rear axle case 36 is fixed to the rear surface of the transmission case 35, and the rear axle case 36 is fixed to the rear surface of the transmission case 35.
6 supports a rear wheel 41. A hydraulic case 37 is further installed on the upper surface of the rear axle case 36, and a hydraulic lift 44 protrudes from the hydraulic case 37.
The rotation moves the work equipment attached to the rear of the tractor up and down.

Figure 2A is the first half of the hydraulic piping as seen from the side of the tractor. Figure 2B is the second half of the hydraulic piping of the tractor as seen from the side. Figure 3A is the first half of the hydraulic piping of the tractor as seen from the top. It is a latter half view showing hydraulic piping.

The constituent functions will be explained in order along the hydraulic oil path.

The oil filter 3 inserted into the transmission case sucks the lubricating oil in the transmission case 35 as hydraulic oil, and guides it into the line filter 2 housed on the bottom surface of the step 1 through the suction pipe 4. The hydraulic oil filtered in 2 passes through a suction pipe 5 and an elastic joint 6, and then from a suction pipe 7 to a flow divider 8. The flow is divided into two directions by the flow divider 8, and the flow in the direction of the suction pipe 30 is sucked into the work equipment lifting pump 10, and the flow in the direction of the suction pipe 29 is sent to the power steering pump 9 via the elastic joint 28. Absorbed.

Follow the flow of hydraulic oil for lifting and lowering the work equipment first.

Hydraulic oil made highly pressurized by the working machine lifting pump 10 is guided through a high-pressure pipe 12 to a hydraulic case 37 mounted on the upper part of a rear axle case 36.
The lift arm 44 is rotated by a hydraulic valve and a piston in the hydraulic case 37. From the side of the hydraulic case, a high-pressure outlet pipe 32 for other working machines, such as a front loader, extends rearward and reaches a hydraulic outlet 34 . The hydraulic oil that operated the pistons in other working machines returns to the return port of the hydraulic pressure outlet 34 and is transferred to the transmission case 35 through the return pipe 33.
The water is recycled into the rear axle case 36, which communicates with the rear axle case 36. The hydraulic fluid that operated the piston in the hydraulic case 37 is similarly circulated into the rear axle case.

Next, follow the path of hydraulic fluid for the power steering device.

Hydraulic oil made highly pressurized by the power steering pump 9 passes through a high-pressure pipe 11 and comes out from below the clutch housing to the right side of the clutch housing. A flow divider device 13 for power steering is located on the right side of the clutch housing 22.
is fixedly installed, and the flow divider device 13
flow inside.

The flow divider device 13 is not just a flow divider, but has an overflow valve and a safety valve built in, and the high pressure oil is transferred from the high pressure pipe 15 to the hydraulic rotation device 23 only when the hydraulic rotation device 23 of the power steering device operates. Go inside. The low pressure oil after being used in the hydraulic rotation device enters the merging valve 17 via the pipe 14 together with the low pressure exiting from the safety valve of the flow divider device. When the power steering system is not operating, high pressure oil flows through the overflow valve to pipe 1.
6 into the merging valve 17 and exiting from the merging valve 17 through the low-pressure pipe 19, it is recycled into the mission case 35. A Pitman arm is fixed to the tip 23 of the hydraulic rotation device of the power steering device 23, and the Pitman arm steers the front wheels. 31 is a clutch pedal.

FIG. 4 is a front sectional view of the pipe fixing device section. Since three pipes pass through the sides of the transmission case 35 and the clutch housing 22, a fixture 20 is provided to prevent the pipes from swinging and to fix them. The fixing fitting 20 is a large diameter low pressure pipe 7
It is fixed by welding to the clutch housing 22, and is protected and fixed to the recessed part of the clutch housing 22 with a bolt. The high pressure pipes 12 and 11 are connected to the lower part of the fixing fitting 20 via an elastic body 24 and holders 25 and 26 made of elastic bodies.
is fitted with a stopper and fixed with a bolt.

As described above, in the present invention, in the step protruding from the side surface of the mission case 35, etc., the step 1
Links such as pedals are arranged below the mission case 35 side, and below the outer end of step 1,
A line filter 2 is supported from step 1 and arranged long in the front and back direction, and one end of the line filter 2 is fixed to a mission case 35 etc. with a suction pipe 4, and the suction pipe on the outlet side from the line filter 5 is Since it is connected to the hydraulic pump side through the elastic joint 6, the following effects are achieved.

First of all, since the line filter 2 is placed below the step 1, the step 1 protects the area around the line filter 2, and the pipe and line filter are no longer damaged by obstacles. Also, since it is located below the step and has a large space, it is possible to arrange a large diameter line filter that matches the capacity of the hydraulic oil.

Second, since it was supported outside and below the step,
There is no interference with the clutch pedal, brake pedal, and their links provided on the inner lower side of the step, and there is no interference with these pedals and links when repairing the line filter.

Thirdly, since one side of the line filter is fixed to the step and the other to the mission case 35 etc. via the suction pipe 4, the outer end of the step has a weak supporting force due to cantilever support. The support of the step can be reinforced with the suction pipe 4, which is effective in strengthening the step.

Fourthly, the suction pipe 5 on the outlet side of the line filter is connected to the hydraulic pump side with an elastic joint 6, so even if some force is applied to the long pipe leading to the hydraulic pump side and the pipe bends, this Elastic joint 6
This elastic joint can also absorb assembly difficulties due to manufacturing errors in long pipes.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the tractor, Figure 2A is a front half view showing the hydraulic piping as seen from the side of the tractor, and Figure 2A is a side view of the tractor.
Figure B is the second half of the hydraulic piping as seen from the side of the tractor, Figure 3A is the first half of the hydraulic piping of the tractor as seen from the top, Figure 3B is the second half of the hydraulic piping of the tractor as seen from the top, and Figure 4 is the fixed pipe. FIG. 3 is a front sectional view of the device section. 1...Step, 2...Line filter, 3
...Oil filter, 4...Suction pipe.

Claims (1)

[Scope of utility model registration request] At the step protruding from the side of the mission case 35, etc., the mission case 3 of step 1
Links such as pedals are placed below the step 1, and a line filter 2 is placed long in the front-rear direction below the outer end of the step 1, supporting it from the step 1.
One end of the line filter 2 is fixed to a mission case 35 etc. through a suction pipe 4, and the suction pipe on the outlet side from the line filter 5 is connected to the hydraulic pump side through an elastic joint 6. Hydraulic system for agricultural tractors.