JPS593125Y2 - Engine lubrication system for four-wheel drive tractors - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an engine lubrication system for a four-wheel drive tractor.

In this type of tractor, the propeller shaft for driving the front wheels passes from the transmission at the rear of the machine, under the engine, to the front wheel differential.

In this case, in order to lower the center of gravity of the aircraft and position the propeller shaft higher, the bottom of the oil pan is recessed upward to form a groove, and the propeller shaft runs longitudinally within this groove.

However, with this structure, the inside of the oil pan is divided into left and right sections by a groove, so drain plugs must be placed at the bottoms of the left and right compartments of the groove, making drain operations cumbersome.

Further, in this case, a strainer is disposed at the bottom of either the left or right chamber.

Therefore, only the oil in the chamber on the side where the strainer is installed is sucked into the oil pump, and the oil in the other chamber is difficult to utilize, and the flow is concentrated in the chamber on the side where the strainer is installed, causing a large amount of sludge to accumulate. This caused problems such as being sucked into the strainer.

This idea solves the above problem, and the left and right oil chambers, which are separated by a groove, are connected to each other by an oil pipe that crosses the bottom of the propeller shaft through a hole in the bottom wall. This oil pipe is shaped so that it is inclined in the left-right direction of the wheel at a position where it does not overlap or overlap the front wheel when viewed from the side, and the lowest point of the inclination is near one side wall of the oil pan or outside of it. It is characterized in that the drain port is opened laterally at the lowest point of the inclination, and the drain port can be opened and closed with a drain plug.

Examples of this invention will be described below based on the drawings.

Figure 1 is a side view of a four-wheel drive tractor, and Figure 2 is a side view of a four-wheel drive tractor.
It is a sectional view taken along the line II-II.

In the figure, 1 is the engine, 2 is the transmission, and 3
is the front wheel and 4 is the rear wheel.

The front wheels 3 are driven by a mid-PTO shaft 5 on the lower surface of the transmission 2, a propeller shaft 6, and a front wheel tip 7.
, are driven via the final reduction gear unit 8.

As shown in FIG. 2, an upwardly recessed groove 10 is formed in the center of the bottom surface of the oil pan 9 of the engine 1 to allow the propeller shaft 6 to run longitudinally.
0, the inside of the oil pan 9 is divided into a left oil chamber 11 and a right oil chamber 12.

At the bottom of the right oil chamber 12, there is a strainer 1 of the forced lubrication device R.
3 are arranged.

The oil in the oil pan 9 is sucked into the oil pump 15 from the strainer 13 through the suction oil passage 14, and from there is pumped through the filter 16 to each lubricating point of the engine.

In the bottom wall of the left and right oil chambers 11.12, there are vents 11a,
12a has been opened, and this entrance 11a
, 12a are communicated with each other by an oil pipe 17 that bypasses the lower side of the propeller shaft 6.

This oil passage pipe 17 is formed in an F-shape as a whole, and a flange portion formed at the end of the riser pipe portion is connected to the oil pan 9.
It is fixed to the bottom wall with bolts 18.

The F-shaped oil passage pipe 17 is arranged such that its communication pipe part is inclined in the left-right direction of the oil pan 9, and the end of the communication pipe part, which is the lowest point of the oil pipe 17, is It is located outside the side wall of the pan 9, and a drain port 19 is opened laterally at this end.

The drain port 19 can be opened and closed with an opening/closing cock (drain plug) 20.

With the above structure, the oil in the left and right oil chambers 11, 1'2 can be simultaneously drained by simply opening the opening/closing cock 20, thereby simplifying the drain operation.

Also, since the bottoms of the left and right oil chambers 11.12 are communicated with each other through the oil pipe 17, the oil on the left oil chamber 11 side is sucked into the strainer 13 through the oil pipe 17, and the left and right oil chambers 11.1
The oil in 2 can be used effectively.

FIG. 3 shows another embodiment, in which ports 11a, 12a
is formed over the entire front and rear width of the oil pan 9, and is closed with a container-shaped oil passage body 17a, and a drain screw (drain plug) is attached to the side wall thereof.

As explained above, in this invention, in an oil pan in which the inside of the oil pan is divided by a groove for longitudinally running the propeller shaft, the left and right oil chambers are communicated with each other by an oil passage pipe that crosses the lower side of the propeller shaft, and the lowest point Since a drain plug is attached to the drain port that has been opened, all the oil can be drained out simply by operating one drain plug.

Moreover, since the sludge falls into the oil pipe, it does not adhere to the strainer, and the sludge inside the oil pipe can be reliably removed when oil is removed.

Furthermore, the oil pipe is formed in an inclined shape at a position where it does not overlap with the front wheel when viewed from the side, and the part near one side wall of the oil pan or the part outside it is formed at the lowest point of the slope to open the drain port. This makes it easy to drain the oil.

In addition, even if a strainer is installed in only one of the left and right oil chambers, the oil in the chamber opposite to the chamber in which the strainer is installed can also be sucked into the strainer via the oil pipe.
Can be used.

Furthermore, since the oil flow is dispersed between the left and right oil chambers, sludge accumulates in the chamber on the opposite side of the strainer. can prevent adsorption and inhalation of substances over a long period of time.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, in which Fig. 1 is a side view of a four-wheel drive tractor, Fig. 2 is a sectional view taken along line II-II in Fig. 1, and Fig. 3 is a modification of the oil pipe. 2 is a sectional view of a main part corresponding to FIG. 2. 1...Engine, 3...Front wheel, 6...
...Prohela shaft, 9...oil pan, 10...6 longitudinal groove, 11.12...
...Oil chamber, 17...Oil pipe, 19...
Drain port, 20...Drain plug (drain plug,
opening/closing cock).

Claims (1)

[Claims for Utility Model Registration] 1. In order to transmit power from the engine 1 to the front wheels 3 and rear wheels 4 via the transmission 2, the bottom surface of the oil pan 9 of the engine 1 is recessed upward to form a groove 10. Intimidate,
In this groove 10 there is a transmission 2 and front and rear wheels 3 and 4.
In a four-wheel drive tractor, the front part of the oil pan 9 of the engine 1 overlaps the front wheel 3 in a side view, and the oil pan 9 is divided by the groove 1o. The left and right oil chambers 11 and 12 are communicated with each other by an oil pipe 17 that crosses the lower side of the propeller shaft 6 through ports 11 a and 12 a opened in the bottom wall thereof,
This oil passage pipe 17 is shaped to be inclined in the left-right direction at a position where it does not overlap or overlap the front wheel 3 when viewed from the side, and a part near one side wall of the oil pan 9 or a part outside it is the lowest part of the inclination, Open the drain port 19 sideways here,
A lubricating device for an engine in a four-wheel drive tractor, characterized in that the drain port 19 is configured to be openable and closable with a drain plug 20. 2. The lubricating device for an engine in a four-wheeled tractor according to claim 1, wherein the drain plug is an open/close cock 20.