JPS643730Y2 - - Google Patents

Description

[Detailed description of the invention] The purpose of this invention is to improve the oil supply into the brake case and to increase the strength of the transmission case itself regarding the brake oil supply structure of various vehicles such as agricultural tractors. .

Large tractors use wet brakes, which are built into a brake case attached to the outer surface of the side wall of the transmission case, and a communication hole is formed in the side wall of the transmission case to communicate between the two cases. However, oil is allowed to flow between the two cases through this communication hole.
However, if such a communication structure is adopted, and the vehicle body tilts to the left or right, the oil will concentrate on the lower brake case side, and the oil in the higher brake case will become extremely low, making it necessary to apply the brakes frequently. When used for work, there was a drawback that the brakes would seize.

In order to solve this drawback, a technique has been devised in which a side gutter is provided inside the upper part of the left and right side walls of the transmission case to receive the oil scraped up by the differential device and to supply this oil to the brake case.

However, even with this improved technique, there is a problem in that the side gutter receives only the amount of oil that is splashed up to the left and right, and it is difficult to supply a sufficient amount of oil.

The present invention is designed to solve these conventional problems, and its features are as follows:
A vehicle that has a differential device built into the transmission case, stores lubricating oil, and has a brake case equipped with a built-in wet brake for braking the transmission shaft linked to the differential device on the outer side wall of the transmission case. In addition, side gutters are provided on the upper inner side of the left and right side walls of the transmission case to receive oil that is scraped up by the differential device and scattered to the left and right. The present invention is characterized in that a connected connecting gutter is provided, and a guide path is provided on each side wall of the transmission case to guide oil from the side gutter into the brake case.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In FIGS. 1 to 3, 1 is a tractor body, and a transmission case 2 is a structure,
Inside the transmission case 2, a drive pinion shaft 3, a differential device 4, a PTO transmission shaft 5, etc. are supported.
Further, a gear case 7 containing a PTO transmission 6 is attached to the rear end of the transmission case 2. The differential device 4 is connected to a ball bearing 1 by a bearing case 9 attached to each side wall 8 of the transmission case 2.
Supported through 0. Mission case 2
A brake case 11, a rear axle case 12, etc. are attached to the outer surface of each side wall 8, and the brake case 11 is used to brake a transmission shaft 13 extending from the differential device 4 through the bearing case 9 to the outside. A wet brake 14 is built-in. The transmission shaft 13 is operatively connected to the rear wheels via a planetary reduction gear, an axle, etc. built into the inner end of the rear axle case 12. The wet brake 14 is configured in a disc type including a fixed plate 15, a ball 16, a movable cam brake 17, a brake disc 18, a stator plate 19, and the like. Oil 20 is stored inside the transmission case 2 and the brake case 11 up to the level of the drive pinion shaft 3 and the transmission shaft 13 . Reference numeral 21 denotes a hydraulic device for lifting and lowering the work machine, and includes a housing 22 installed so as to close the upper opening of the mission case 2, and a cylinder 23, a piston rod 24, and a hydraulic arm 2 in the housing 22.
5. It is equipped with a hydraulic arm shaft 26, a lift arm 27, etc., and the oil 20 in the transmission case 2 is supplied to the cylinder 23 as hydraulic oil via a control valve 28, and the return oil is supplied to the oil supply. It is discharged through a pipe 29 toward the connection between the piston rod 24 and the hydraulic arm 25. A gutter 30 is integrally formed inside the upper part of the transmission case 2 to receive oil scraped up by the differential device 4 and return oil discharged from the oil supply pipe 29. That is, a side gutter 31 is integrally formed on the inside of the upper part of the left and right side walls 8 of the transmission case 2 to receive the oil scraped up by the differential device 4 and scattered left and right. A connecting gutter 32 that intersects and receives oil on the front side in the oil scooping direction is integrally molded, and this connecting gutter 32 is connected to the front ends of the left and right side gutter 31 to flow oil to the side gutter 31. In addition, drop holes 33 are formed at the front ends of the left and right side troughs 31 to guide the received oil downward. On the other hand, an oil supply hole 34 is formed in each side wall 8 so as to communicate with the upper side inside the brake case 11.
An oil receiver 35 is integrally formed on the inner surface of the side wall 8 so as to surround 4 and be located below the drop hole 33, and the oil supply hole 34 and the oil receiver 35 constitute a guide path. A small communication hole 36 is formed in the side wall 8 of the transmission case 2 so as to communicate from the lower part of the brake case 11 to the inside of the transmission case 2. 37 is an opening formed between the gutters 30.

Next, the effect will be explained. Oil 20 is stored in the transmission case 2, and the differential device 4 rotates around the horizontal axis in the direction of the arrow a, so while the differential device 4 is rotating, it is always operated by a large diameter gear etc. oil 20
Raising up. The scraped up oil scatters upward from the rear side of the differential device 4 through the opening 37 as shown by the arrow b, and the oil scattered left and right flows into the left and right side gutter 31.
The oil that is received by the connecting gutter 32 and scattered to the front side is received by the connecting gutter 32 and is flowed to the left and right side gutter 31,
The oil is supplied from the drop hole 33 of No. 1 through the oil receiving portion 35 and the oil supply hole 34 into the brake case 11 as shown by arrow c. On the other hand, while the engine is operating, except when the work equipment is being raised, the return oil from the control valve 28 is always discharged through the oil supply pipe 29 toward the connection between the piston rod 24 and the hydraulic arm 25, and a portion of it is Since the oil is received by the gutter, especially the connecting gutter 32, the oil is also supplied into the brake case 11 through the drop hole 33, the oil receiver 35, and the oil supply hole 34. That is, during operation, oil is constantly supplied into the brake case 11 from the gutter 30 through the oil supply hole 34. On the other hand, the oil in the brake case 11 is returned to the transmission case 2 as shown by the arrow d through the communication hole 36 at the bottom of the brake case 11. Therefore, while the tractor body 1 is in a horizontal state, the transmission case 2 The oil levels inside the brake case 11 and inside the brake case 11 are kept approximately the same.

Next, when working on a slope, etc., the tractor body 1
When the brake case 11 is tilted in the left-right direction, oil begins to flow to the lower side through the communication hole 36, but this communication hole 36 is a small hole and the flow rate is small compared to the amount of oil in the brake case 11. Therefore, mission case 2
The oil in the brake case 11 gradually reaches the same level after passing through the state shown in FIG. It can also prevent seizure when used for

According to the present invention, the oil scraped up by the differential device is received by the connecting gutter on the front side in the scraping direction, so the oil receiving efficiency is better than the side gutter which receives left and right scattered oil, and the side gutter Since the connecting gutter is connected to the left and right sides, it is possible to receive a larger amount of oil than when only the brake case is provided, and a sufficient amount of lubricating oil can be supplied into the brake case. It is also possible to reinforce the left and right side walls.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Figure 1 is a cutaway side view of the main part, Figure 2 is a front view of the same part, and Figure 3 is a cutaway front view of the same part.
The figure is a plan view of the same, and FIG. 4 is an action explanatory diagram. 2...Mission case, 4...Differential device, 8
... Side wall, 11 ... Brake case, 12 ... Rear axle case, 13 ... Transmission shaft, 14 ... Wet brake, 20 ... Oil, 21 ... Hydraulic system for lifting and lowering work equipment, 28 ... Control valve, 29...Oil supply pipe, 30...
Gutter, 34... Oil supply hole, 35... Oil receiver, 36...
Communication hole.

Claims (1)

[Scope of utility model registration request] A vehicle with a built-in differential device and lubricating oil stored in the transmission case, and a brake case equipped with a built-in wet brake for braking the transmission shaft linked to the differential device on the outer side wall of the transmission case. In addition, side gutters are provided on the upper inner side of the left and right side walls of the transmission case to receive oil that is scraped up by the differential device and scattered to the left and right. A brake oil supply structure for a vehicle, characterized in that a connected connection gutter is provided, and a guide path for guiding oil from the side gutter into the brake case is provided on each side wall of the transmission case.