JPS6238823Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is used to obtain pressure oil used in the lift mechanism for raising and lowering ground work equipment installed on a tractor, or for operating a front loader, front lift, etc. installed on a tractor. Second, it relates to suction piping for sucking oil in the mission case to the pump.

In tractors where the pump is located on the left side of the engine and the suction pipe facing into the transmission case is located on the right side in relation to the layout of other equipment, if the suction pipe to the pump is laid across the bottom of the transmission case, it is likely to cause oil leakage or damage due to the loosening of the threads caused by collisions with pebbles or soil, etc. In order to eliminate such problems, a structure is adopted in which the piping is laid through the front transmission case to the left, or the piping is laid through the engine room below the bonnet to the left. However, in the former case, a large rotating body such as a flywheel is installed near the through-hole, and in the latter case, the engine and numerous accessories are installed, so that such cross-piping is not easy.

Therefore, in this invention, we propose a suction hydraulic circuit that is devised to facilitate piping work while well preventing damage to the suction pipe.The configuration will be explained based on one embodiment shown in the drawings. , the oil pan 2 connected to the lower part of the engine 1 has a right side bottom 2b lower and lower than a left side bottom 2a, as shown in a side view in Fig. 1 and as shown in the front in Fig. 2. Form and also this oil pan 2
The rear part of the is the rear bottom part 2c which is the same height as the left bottom part 2a.
is formed behind the right side bottom part 2b, and this left side bottom part 2
A step portion 2d that is higher than the left side bottom portion 2a and the rear bottom portion 2c is provided adjacent to the left side bottom portion 2a and the rear side bottom portion 2c.

A suction cylinder 4 consisting of an oil filter is provided in the lower right side of the transmission case 3.
The rear portion 5a of the suction pipe 5, which is connected to the rear portion of the suction pipe 5, is disposed forward along the outer right side of the mission case 3, and the rear portion 5a of the suction pipe 5 is connected to A left-right cross section 5b, in which the front end of the portion 5a is bent leftward, is formed in the suction pipe 5, so that the left-right cross section 5 is lower than the lower surface of the left bottom portion 2a.
The left and right transverse portions 5b are arranged so that the lower surface of the cross section 5b is located upward.

The left end of the left-right cross section 5b may be extended as it is to the vicinity of the outside of the left side of the oil pan 2, but in the illustrated example, it extends before reaching the outside of the left side as shown in FIG. bottom left side 2
a and is disposed forward along the lower surface of the left bottom portion 2a to form the disposed portion 5c. The front rising portion 5d is raised to form a front rising portion 5d, and the front rising portion 5d is connected to the suction side of a gear type pump 6 provided near the left side of the engine 1.
It is configured to send pressure oil from a delivery pipe 7 connected to the delivery side of the pump 6 to a control valve of the lift mechanism, an external hydraulic pressure extractor, etc. via a branch valve (not shown), etc.

In the tractor as shown in the figure, which also has a front wheel drive, the front wheel drive shaft 8 and its cover 9 are positioned between the left side of the right bottom portion 2b and the front mounting portion 5c, and the A front wheel drive shaft 8 connected to an output shaft 10 of a front wheel drive gear mechanism housed in the front portion is configured to rotationally drive a front wheel differential gear mechanism within a front wheel differential case 12 via a front wheel differential pinion shaft 11.

As described above, the pressure oil suction hydraulic circuit according to this invention has a stepped portion 2d formed along the left-right direction at the rear of the oil pan 2 provided at the bottom of the engine 1, with the rear side bottom portion 2c rising. , and a left and right cross section 5b disposed along the stepped section 2d is formed between the suction side of the hydraulic pump 6 used for raising and lowering the tractor working machine and the suction side communicating with the transmission case 3. Therefore, when viewed from the front, this left and right transverse section 5b is almost flat on the step 2d of the oil pan 2, and the step 2d blocks pebbles and mud that are scattered during agricultural work. For the same reason, straw, grass, etc. do not collide with the left and right cross sections 5b.
It does not get wrapped around.

Therefore, the left and right crossing portions 5b are protected from collisions and wrapping by the stepped portions 2d.
This effectively prevents deformation, damage, etc., prevents oil leaks, and eliminates the adhesion of mud, etc., thereby preventing corrosion and deterioration.

This piping work for the suction pipe can be easily done for surrounding equipment parts, as in conventional structures where piping is installed through the transmission case or across the engine room under the bonnet. In this invention, this disadvantage can be overcome by locating the lower part of the oil pan without such device parts.

Note that if the cover 9 of the front wheel drive shaft 8 is disposed so as to pass through the left side of the left bottom portion 2b of the oil pan 2 as shown in the illustrated example, the front wheel drive shaft 8 and the cover 9
This also has the advantage that the left bottom portion 2b effectively prevents collisions and adhesion of pebbles, mud, etc. that try to fly in from the right side.

[Brief explanation of the drawing]

FIG. 1 is a front side view of a tractor to which one embodiment of this invention is applied, and FIG. 2 is a front view of FIG. 1. Description of symbols, 1...Engine, 2...Oil pan, 2a...Bottom left side, 2b...Bottom right side, 2c
... Rear bottom, 2d... Step, 3... Mission case, 4... Suction cylinder, 5... Suction pipe, 5a...
Rear arrangement part, 5b... Left and right crossing part, 5c... Front arrangement part, 5d... Front rising part, 6... Pump,
7... Delivery pipe, 8... Front wheel drive shaft, 9... Cover, 10... Output shaft, 11... Front wheel differential pinion shaft, 12... Front wheel differential case.

Claims (1)

[Scope of utility model registration request] At the rear of the oil pan installed at the bottom of the tractor's engine, a stepped section with a raised rear bottom is formed along the left and right direction, and is used for the suction side of the hydraulic pump used for raising and lowering the tractor work equipment, etc., and the transmission case. 1. A suction hydraulic circuit for pressure oil in a tractor, characterized in that a left-right crossing section is formed in the middle of a suction pipe that communicates with the above-mentioned step section.