JPS6127318Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling structure for a brake device of an agricultural tractor or the like.

For example, in a wet disc brake system for agricultural tractors, the brake case is attached to the outer surface of the transmission case and is in a nearly sealed state, so there is no oil circulation and the cooling effect is low. It deteriorated quickly and it was difficult to change the oil.

In view of these conventional problems, the present invention has a structure in which an oil receiver is provided at the upper part of the inner surface of the transmission case, and the oil accumulated in this oil receiver is supplied into the brake device through an oil hole. The object of the present invention is to provide a cooling structure for a brake device that improves the cooling effect and enables oil exchange.

A feature of the present invention for achieving this purpose is that in a brake device disposed on the outer surface of the transmission case, an oil receiver is provided at the upper part of the inner surface of the transmission case. The part and the inside of the brake device are in communication with each other through an oil hole for supplying the oil accumulated in the oil receiving part to the brake device.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3, reference numeral 1 denotes a differential device disposed inside a transmission case 2 of a tractor, which includes a bevel gear 3, a pair of differential pinions 4, a pair of differential side gears 5, a differential pinion shaft 6, and a pair of gears. It has a shaft 7, a differential case 8, etc.

A brake device 11 for braking the gear shaft 7 is arranged on the outer surface of the transmission case 2. A rear axle case 12 is arranged outside the brake device 11.
3 and the rear axle case 12 are fixed to the transmission case 2 with a common bolt.

A rear axle 14 is rotatably supported by a rear axle case 12, has a wheel 15 at its outer end, and a final reduction gear 16 of a planetary gear mechanism is disposed at its inner end between it and the gear shaft 7.

The final reduction gear 16 includes a sun gear 17 formed on the outer end of the gear shaft 7, and a planetary gear 19 rotatably supported on the inner end of the rear axle 14, which is a carrier, via a shaft 18. It consists of an internal gear 20 held between a brake case 13 and a rear axle case 12.

The brake device 11 includes three brake disks 23 fitted into a spline portion 22 formed in the middle of the gear shaft 7 so as to be slidable in the axial direction, and two plates 24 disposed between the disks 23. A cam plate 25, a case 27 that supports the differential case 8 via a bearing 26 and is in contact with the outer surface of the transmission case 2; A plurality of balls 28 engaged with the recess 25a
, a cam 29 that rotates the cam plate 25, and a cam lever 30.
The cam plate 25 rotates by the operation, and the recess 2
5a and the ball 28 to clamp the brake disc 23 and brake the rotation of the gear shaft 7.

Disc 23, plate 24, cam plate 2
5 and the case 27, the inside of the brake case 13 is a gap between the bearing 26 and the transmission case 2.
It communicates with the inside of the mission case 2 through a communication hole 31 formed in the lower part of the case 27, and the oil in both cases 2 and 13 is at the same level.

However, although each component of the differential device 1 and the brake device 11 is rotating, the brake case 13
Since it is in the shape of a dead end, there is almost no flow of oil from the inside of the transmission case 2 into the inside of the brake case 13, and the oil inside the brake case 13 is in a substantially sealed state.

Reference numeral 33 denotes an oil receiver member fixed to the upper inner surface of the side wall 2a of the transmission case 2 (above the bearing 26) via a bolt 34, and together with the side wall 2a, forms an oil receiver part 35 that is open upward. The oil scraped up and scattered by the bevel gear 3 or the oil returned from the control valve (not shown) of the hydraulic system is collected therein.

Reference numeral 37 denotes an oil hole that is continuously drilled in the side wall 2a and the case 27, communicates between the oil receiver 35 and the inside of the brake device 11, and is inclined downward toward the brake device 11 side.

Therefore, the oil accumulated in the oil receiving portion 35 flows through the oil hole 3.
7 and is supplied into the brake device 11 to cool the disc 23 and the like. This oil accumulates inside the brake case 13, and the lower part of the brake case 13 communicates with the inside of the transmission case 2, so the old oil inside the brake case 13 is removed from the transmission case 2.
The oil is exchanged through circulation.

The oil receiving member 33 may be integrally molded with the side wall 2a, or may be a recess formed in the side wall 2a itself and capable of storing oil. Further, if the oil hole 37 is permitted due to the positional relationship with the ball 28 etc.,
It may be formed horizontally. Furthermore, it is also possible to supply oil to the brake device 11 by connecting the oil discharge port of the control valve of the hydraulic device and the oil receiving portion 35 or the oil hole 37 with a pipe.

According to the present invention described in detail above, the oil receiving portion 35
By providing oil holes 37 and 37, scattered oil in the transmission case 2 or return oil from the hydraulic system can be supplied into the almost sealed brake system, and the oil in the brake system can be replaced. As a result, the cooling effect is improved, oil deterioration is prevented, and the durability of the brake system is improved.

4 to 6 show examples of fender brackets mounted on the rear axle case 12, and the brackets 41 and 42 shown in FIGS.
The lower bracket 41 has a blank hole 41a and a screw hole 41b, and the upper bracket 42 has two screw holes 42a and 42 from the top surface.
A and one screw hole 42b are formed from the bottom surface.

43 is the upper and lower flange portions 12 of the rear axle case 12
44 is a bolt that passes through a and is screwed into the screw hole 41 of the lower bracket 41.
2a and the hole 41a, and the upper bracket 4
The bolt is screwed into the screw hole 42b of No. 2,
The upper and lower brackets 41, 42 are fixed to the rear axle case 12 by these two bolts 43, 44.

Although not shown, the front part of the fender 45 is fixed to a step of a tractor or the like, and the rear lower part is fixed to brackets 41 and 42. fender 4
A mounting plate 47 is horizontally welded to the rear lower part of the mounting plate 5, and this mounting plate 47 is placed on the upper bracket 42, and the bolts 4 screwed into the screw holes 42a, 42a are mounted on the upper bracket 42.
8,48.

At least one screw hole for screwing the bolt 44 is formed in the lower surface of the upper bracket 42 in addition to the screw hole 42b.
d, the center C of the upper bracket 42 can be shifted forward, and when the lower bracket 41 is reversed and the bolts 44 are brought to the rear side, the screw holes 42b, 42c, 42d By selecting , the center C of the upper bracket 42 can be moved rearward from the position shown in FIG.

Usually, there are many types of tractors, large and small, and the size of the fender must be changed depending on the size of the tractor. This is because the fender is attached to the front and rear at multiple locations such as the step and the rear axle case 12, and the distances therebetween vary.

However, since the brackets 41 and 42 are adjustable in their front and rear positions, one type of fender 45 can be attached to many types of tractors, reducing the number of types of fenders 45 and improving versatility. You will be able to do so.

Furthermore, when repairing or inspecting the brake device 11 or the final reduction gear 16, the rear axle case 12 must be removed from the transmission case 2. If the cabin 49 and the like are attached, it becomes extremely difficult to remove the fender 45.

Even in this case, the height H of the upper surface of the bracket 41
If it is set higher than the height h of the brake device 11, the bolts of the brackets 41 and 42 can be released without removing the fender 45.
The rear axle case 12 can be removed from the transmission case 2.

The brackets 41 and 42 are made of cast iron, and two brackets form a set, but as shown in FIG. 6, three or more brackets 50a, 50b,
50c, the brake device 11
It is sufficient to prepare the necessary number of brackets to obtain the upper surface of the bracket higher than the height h.

Note that the uppermost brackets 42 and 50a remain fixed to the fender 45, and the rear axle case 1
2 is removed by removing the bolt 44.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an overall sectional rear view, FIG. 2 is a plan view, FIG. 3 is a sectional view of main parts, and FIGS. Figure 6 shows an example of the fender mounting structure, Figure 4 is a sectional rear view, Figure 5 is a sectional view taken along the - line in Figure 4, and Figure 6 is a sectional view showing an example using three brackets. be. 1... Differential device, 2... Mission case, 2
a... Side wall, 7... Gear shaft, 11... Brake device, 13... Brake case, 16... Final reduction gear, 23... Brake disc, 27... Case, 33... Oil receiver member, 35... ...Oil receiver, 3
7...Oil hole.

Claims (1)

[Scope of utility model registration request] In the brake device arranged on the outer surface of the transmission case, an oil receiver is provided at the upper part of the inner surface of the transmission case, and the oil receiver and the inside of the brake device are connected to each other so that the oil that accumulates in the brake device can be removed. A cooling structure for a brake device, characterized in that the structure is communicated with an oil hole for supplying oil into the brake device.