JPS6134208Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an invention regarding the installation location and piping of equipment for a hydraulic system.

Agricultural tractors have independent hydraulic systems such as a hydraulic lift system for lifting the working equipment and a hydraulic system for a hydraulic clutch system, but a hydraulic system is also installed when a hydraulic steering system (commonly known as a power steering system) is installed. There is a need.

Most of the piping and equipment for these hydraulic systems are located outside the tractor, and there are various restrictions on the selection of locations and the determination of piping positions.

Among these devices, the present invention is particularly concerned with the arrangement of flow dividers for power steering devices.

A flow divider is installed to constantly send pressure oil at an appropriate pressure to the hydraulic directional control valve of a power steering device.
As disclosed in Japanese Patent No. 52-68531, a mounting stay is provided on the clutch housing, and a flow divider is mounted on the mounting stay. However, the shape of the flow divider protrudes from the clutch housing, and accidents have occurred in which parts of the flow divider come into contact with obstacles on the road or in the field, resulting in damage.

The purpose of the present invention is to locate the flow divider in a safe location near the transmission case and clutch housing, but not protruding from the clutch housing protrusion.

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

FIG. 1 is an overall plan view of a tractor equipped with a power steering device. Although FIG. 1 shows an eccentric type tractor in order to make the power steering system easier to understand, it goes without saying that the configuration of the present invention is not limited to this type of tractor. An engine 10, a power steering hydraulic pump 3, and a hydraulic lifting device hydraulic pump 4 are installed inside the bonnet 37. The power steering device rotates the front wheels 35, 35 using hydraulic pressure, and the steering handle 33
Based on the rotation, the hydraulic directional control valve 9 is operated,
Pressure oil is sent to either of the oil pipes 28, 29. The cylinder 27 is a reciprocating cylinder, and if you want to turn to the right, turn the steering wheel to the right and high pressure will be sent to the oil pipe 29 by the hydraulic directional control valve 9, causing the cylinder 27 to move to the right.
extends, the drag rod 30 rotates the knuckle arm to the right, and the front wheel rotates to the right.

The tie rod 32 causes the left wheel to rotate to the right in the same way. When turning to the left, high pressure flows to the oil pipe 28, the cylinder 27 contracts, the knuckle arm 31 rotates to the left, and the front wheel 35 also rotates to the left.

36 is the rear wheel.

Figure 2 is a diagram of the hydraulic piping in the vicinity of the clutch housing and transmission case, with the front section shown in Figure 2a and the rear section shown as a side view divided into two parts in Figure 2b. .

FIG. 3 is a plan view of the hydraulic piping diagram of FIG. 2, with the front section shown in FIG. 3a and the rear section shown in FIG. 3b.

FIG. 4 is a front view of the flow divider, only a portion of which is shown.

2a and 3a, a clutch housing 7 is fixed to the rear surface of the engine 10, and a transmission case 22 is fixed to the rear surface of the clutch housing 7. As shown in FIGS. A rear axle case 23 is further fixed to the rear surface of the transmission case 22.

Two hydraulic pumps are drivably mounted on the side of the engine 10, and hydraulic oil is sucked through a single suction pipe 13.

A filter inside the case (not shown) is placed at the rear of the transmission case, and from this the oil pipe 24
and remove foreign matter with a line filter 21. A suction pipe 13 extends toward the pump from the outlet side of the line filter. The hydraulic oil in the suction pipe is divided by the distributor 5, and one part enters the hydraulic pump 3 for the power steering device through the oil feed pipe 11, and the other goes through the oil feed pipe 12 and enters the hydraulic pump 4 for the hydraulic lifting device. . Pressure oil discharged from the hydraulic pump 4 for the hydraulic lifting device passes through the oil pipe 14 and enters the hydraulic cylinder device 34 installed on the upper part of the rear axle case. On the other hand, the pressure oil discharged from the hydraulic pump 3 for the power steering device is sent to the right side of the transmission case by an oil feed pipe 15, passing under the clutch housing.

The flow divider 1 is located at the rear of the protrusion 7a of the clutch housing 7, and is connected to the brake arm 25,
It is arranged with a space provided inside the rotation locus of 26. Necessary pressure oil from the flow divider enters the hydraulic directional control valve 9 via the oil feed pipe 17. Further, the excess pressure oil passes through the oil feed pipe 18 and returns to the mission case through the oil feed pipe 20 together with the return oil from the hydraulic directional control valve at the merger 2. 16,1
9 is a return oil supply pipe.

A steering handle is provided at the top of the steering column 8.

Two oil pipes 2 separate from the hydraulic directional control valve 9
8 and 29 are protruding, and these extend and contract the hydraulic cylinder 27.

As described above, in the present invention, the front end of the clutch housing 7 is configured with a left and right protrusion 7a at the joint with the rear end of the engine 10, and behind the protrusion 7a, the side surface of the clutch housing 7 and the brake In the space surrounded by the rotation locus of the arms 25 and 26,
A flow divider 1 for a power steering device is attached to the side surface of the clutch housing 7, and this configuration provides the following effects.

Firstly, unlike the conventional technique disclosed in Japanese Utility Model Application No. 52-68531, since the flow divider 1 and the like do not protrude beyond the side surface of the protruding portion 7a of the clutch housing 7, it is possible to avoid obstacles while the agricultural tractor is running. This means that they no longer get damaged by coming into contact with objects. Particularly, in the present invention, the flow divider 1 is arranged in a protected manner behind the protrusion 7a of the clutch housing 7 in a hidden position, thereby preventing the agricultural tractor from coming into contact with an obstacle while moving forward. was gone.

Second, when arranging the flow divider 1, the flow divider 1 is placed directly on the side surface of the non-protruding portion behind the protruding portion 7a of the clutch housing 7, without providing a mounting stay on the lower surface or side surface of the clutch housing 7. Since it is attached, there is no need to provide a flow divider 1 or a mounting stay below the clutch housing 7. This also eliminates the possibility of the downwardly projecting portion of the clutch housing 7 coming into contact with obstacles.

Thirdly, the flow divider 1 is connected to the brake arm 2.
Since the brake arms 25 and 26 are placed inside the brake arms 25 and 26, the operator's sense of driving is to never engage in dangerous driving that would cause the brake arms 25 and 26, on which the operator's feet are placed, to come into contact with obstacles. This means that the divider 1 is placed in a safe position.

[Brief explanation of the drawing]

Figure 1 is an overall plan view of a tractor with a power steering device. Figure 2 shows the clutch housing.
It is a side view which shows the hydraulic piping of a mission case, FIG. 2a shows the front half, and FIG. 2b shows the rear half. FIG. 3 is a plan view showing the hydraulic piping, with FIG. 3a showing the front half and FIG. 3b showing the rear half. FIG. 4 is a front view of the flow divider attachment section. 1... Flow divider, 2... Combiner, 3...
Hydraulic pump for power steering, 4...Hydraulic pump for hydraulic lifting device, 5...Distributor, 7...Clutch housing.

Claims (1)

[Scope of utility model registration request] A left and right protrusion 7a is formed at the front end of the clutch housing 7 at the joint with the rear end of the engine 10, and behind the protrusion 7a, the rotation of the side surface of the clutch housing 7 and the brake arms 25, 26 is controlled. This hydraulic system for an agricultural tractor is characterized in that a flow divider 1 for a power steering device is attached to the side surface of a clutch housing 7 in a space surrounded by a locus.