JPS5942554Y2 - Oil supply device for mobile work vehicles - Google Patents

Description

[Detailed explanation of the invention] In mobile work vehicles such as agricultural tractors, it is customary for the transmission case housing the transmission device to also serve as an oil tank, and for hydraulic clutches and other hydraulic actuators installed in the transmission device. A valve mechanism block containing a valve mechanism for equipment is often installed on the top surface of the above-mentioned mission case.

This invention thus relates to an oil supply system for a traveling work vehicle in which a valve mechanism block containing a valve mechanism for hydraulically operated equipment is installed on the top surface of a transmission case that also serves as an oil tank.

Lubricating the transmission components located above the oil level in the transmission case, which also serves as an oil tank, has traditionally been carried out using oil splashed up by gears, etc. located below the oil level. .

If lubrication is insufficient simply by using the splashed oil as it is, a method is adopted in which the splashed oil is collected and actively guided to the lubricated part.

This idea focuses on the valve mechanism block on the upper surface of the transmission case in the above-mentioned traveling work vehicle, and has an extremely simple structure that lubricates the transmission members etc. on the upper part of the transmission case, in addition to the above-mentioned splashed oil. The object of the present invention is to provide a novel oil supply device which can be effectively and satisfactorily achieved even with other oils.

The configuration of the oil supply device according to the invention will be explained with reference to the illustrated embodiment. In the figure, reference numeral 1 denotes a mission case of an agricultural tractor, etc. In the mission case 1, there are driving shafts 2 that are parallel to each other. Arranged between the rotating shaft 3,
It is equipped with a hydraulic clutch type transmission.

The transmission includes a plurality of gears 4 loosely fitted to a rotating shaft 3,
5, 6.7, and a plurality of multi-disc hydraulic clutches 8, 9, similarly provided on the rotating shaft 3 for selectively coupling the respective gears 4, 5, 6.7 to the rotating shaft 2. 10.11.

Each of the above-mentioned gears 4, 5.6 is meshed with one of three gears (not shown) fitted on the driving shaft 2, and the above-mentioned gear 1 is fitted on the driving shaft 2. It meshes with a gear on the intermediate shaft, also not shown, which is also not shown.

By selectively operating each hydraulic clutch 8, 9, 10.11, each gear 4, 5, 6.7 is selectively coupled to the rotating shaft 3, so that the rotating shaft 3 is connected to the driving shaft 2, Forward rotation 1.2
Alternatively, it is driven to rotate at 3rd speed or reverse 1st speed.

Mission case 1 has hydraulic flanch 8, 9° io, 1
It is also used as an oil tank 12 for storing hydraulic oil for the i, and from this oil tank 12 a hydraulic pump 13 connects each hydraulic clutch 8, 9, through an oil supply circuit 14 and a switching valve 15.
Hydraulic oil is selectively supplied to 10.11.

The switching valve 15 has a neutral position N and two hydraulic pressure points 8, 9,
Fl, F2.10, F2. F
3. It has an R position.

The oil pressure of the oil supply circuit 14 and therefore each hydraulic flange 8,9
, 10.11 is set by a pressure regulating valve 17 inserted into a branch circuit 16 branched from the oil supply circuit 14.

A relief valve 18 for setting the lubricating oil pressure is inserted in the branch circuit 16 at a stage subsequent to the pressure regulating valve 17, and a lubricating oil supply path 19 is branched from the branch circuit 16 at a stage before the relief valve 18, and the lubricating oil supply path 19 is branched from the branch circuit 16 at a stage before the relief valve 18. The oil supply path 19 is connected to each hydraulic clutch 8, 9, 10 via an oil path 20 formed in the rotating shaft 3.
．． This leads to the friction plate section 11.

In particular, the relief valve 18 described above is installed in a hole 23 formed through the upper wall of the mission case 1 facing the oil passage section 22 formed in the valve mechanism block 21 installed on the minkcon case 1. The relief oil from the relief valve 1B is drained and returned into the mission case 1 which also serves as an oil tank 12 at a high position within the mission case 1.

The illustrated relief valve 18 includes a short cylindrical valve case 24 that is press-fitted into the hole 23, and this valve case 2.
'C oil tank 1 is seated on the valve seat 24a formed on the lower surface of 4.
2, a valve body 25 that shuts off communication of the oil passage portion 22 to the inside of the mission case 1; and a compression spring 26 disposed around the outer periphery of a valve rod 25a protruding from the upper surface of the valve body 25. It is composed of a compression spring 26 whose lower end is supported on the upper surface of the valve body 25 and whose upper end is supported on the lower surface of a spring receiving plate 28 whose position is held by a pin 27 that can be inserted into the valve rod 25a. The valve body 25 is moved upward by the action of the compression spring 26 and is urged to sit on the valve seat 24a, and the oil passage portion 2
When the oil pressure in the transmission case 2 increases until it overcomes the spring force of the compression spring 26, the oil pressure causes the valve body 25 to move downward and leave the valve seat 24a, and the oil is relieved inward to the transmission case 1. It is composed of things.

A valve mechanism block 21 containing the switching valve 15 and the pressure regulating valve 17 is installed on the upper surface of the transmission case 1, while the valve mechanism block 21 contains lubricating oil for the hydraulic flange 8-11. The oil passage section 22 is formed by opening at the upper surface position of the mission case 1, and the relief valve 18 is inserted into the hole 23 formed in the earthen wall of the mission case 1 by the valve case 24, facing the opening end thereof. They fit together and are installed.

As shown in the figure, the upper end of the valve case 24 is provided with a collar that comes into contact with the upper surface of the mission case 1, and the valve case 24 is fitted into the hole 23 from the upper surface side of the mission case 1. The valve seat 24a is formed into a truncated conical shape that expands downward, and an opening at the lower end of the valve case 24 surrounded by the valve seat 24a allows oil to expand downward. Drenro is provided.

In the figure, reference numeral 29 is an operating mechanism provided on the valve mechanism block 21. The lower end of the operating lever 15a of the switching valve 15 is exposed to the inside of the operating mechanism using a housing, and the lever 15a and the valve 1
30 is a part of the lubricating oil supply path 19 formed in the upper wall of the mission case 1 and the interposed plate body 32 between the housing 31 at the front of the mission case 1; This oil passage corresponds to the oil passage 20 in the housing 31 and communicates with the oil passage 20 in the rotating shaft 3.

According to the configuration of the embodiment described above, the hydraulic clutch 8
When the relief valve 18 that sets the oil pressure of the lubricating oil supplied to the lubricating oil 11 performs a relief operation, the return oil that is returned to the mission case 1 which also serves as the oil tank 12 as the relief oil is the most in the mission case 1. A valve case 240 is connected to the mission case 1 at a high position on the inner surface of the earthen wall, and is surrounded by the valve seat 24a.
Since the oil drain port is configured to expand downward, the oil is drained in a spreading manner until it reaches the oil level within the transmission case 1.

Therefore, the above-mentioned return oil is poured onto a wide range of transmission members located above the oil level in the mission case 1, that is, in the case shown, the drive shaft 2 and the gears on it, and then poured onto the transmission case 1. The returned oil lubricates a wide range of transmission members, etc., and also cools them.

As is clear from the above explanation, the oil supply system for the traveling work vehicle of this invention has a valve mechanism block that houses the valve mechanism for hydraulically operated equipment installed on the top surface of the transmission case that also serves as an oil tank. In the traveling work vehicle, an oil passage section 22 for lubricating oil for hydraulically operated equipment is formed in the valve mechanism block 21 by opening at the upper surface position of the transmission case 1, and at a position facing the open end of the oil passage section 22. A hole 23 is formed in the earthen wall of the mission case 1 to vertically penetrate the earthen wall, and this hole 23 has an oil drain hole which is a relief valve 18 for setting the lubrication oil pressure and expands downward. The relief valve 18 equipped with the valve case 24 is inserted into the hole 2 from the upper surface side of the mission case 1.
3 and is fitted and installed, and has the following effects.

That is, the oil supply device of this invention has the above-mentioned relief valve 18.
The drain oil is returned to the mission case 1 which also serves as an oil tank.The relief valve 18 is installed in the hole 23 in the earth wall of the mission case 1, and the drain oil is returned to the uppermost position inside the mission case 1. In addition, the oil drain hole of the relief valve case 24 is shaped to expand downward, so that the oil spreads out in the mission case 1 and spreads over a wide area. Therefore, drain oil is poured onto a wide range of transmission members and bearing members located above the oil level in the transmission case 1, which also serves as an oil tank. , transmission members, etc. over the same wide range will be sufficiently lubricated.

In this way, the oil supply device of this invention is designed to sufficiently lubricate the transmission members, etc. in the upper part of the transmission case, and has an extremely simple structure.

This is because the relief valve 18 for setting the lubrication oil pressure is originally provided, and the hole 23 formed through the upper wall of the transmission case serves as a hole for mounting the relief valve 18 and a hole inside the relief valve 18. The oil passage section 22, which is formed in the valve mechanism block 21 and opened at the upper surface of the mission case 1, is also used as a hole for returning oil into the mission case 1 through the hole. Since the lubricating oil passage can be formed by casting during the casting of the block, it is easy to form the lubricating oil passage, and the necessary sealing can be immediately performed on the upper surface of the transmission case 1. Above, the relief valve 18 is installed in the hole 23 on the upper wall of the mission case, and the valve mechanism block 21 is installed on the upper surface of the mission case.
The structure is easy to assemble because all you have to do is install the oil drain hole in the valve case 24 of the relief valve 18. This is because it is obtained by setting the shape of , and no special members are added.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal section of a transmission device according to this invention, and FIG. 2 is a circuit diagram showing a hydraulic circuit in the same device. 1...Mission case, 2...Driving shaft, 3...Rotating shaft, 8, 9, 10.11...
... Hydraulic clutch, 12 ... Oil tank, 13
...Hydraulic pump, 16...Branch circuit, 1
7...Pressure regulating valve, 18...Relief valve,
19... Lubricating oil supply path, 20... Oil passage, 21... Valve mechanism block, 22...
Oil passage section, 23...hole, 25...valve body.

Claims (1)

[Scope of utility model registration request] In a traveling working vehicle in which a valve mechanism block containing a valve mechanism for hydraulically operated equipment is installed on the upper surface of a transmission case that also serves as an oil tank, an oil passage for a lubricating male for the hydraulically operated equipment is installed in the valve mechanism block 21. m22 is formed to open at the upper surface position of the mission case 1, and is positioned facing the open end of the oil passage section 22 to open the transmission case 1.
A hole 23 is formed in the earthen wall to vertically penetrate the earthen wall, and this hole 23 is equipped with a valve case 24 having an oil drain hole which is a relief valve 18 for setting the lubrication oil pressure and expands downward. The oil supply device includes a relief valve 18 fitted by fitting the valve case 24 into the hole 23 from the top side of the transmission case 1.