JPS5853250Y2 - Tractor rear brake mounting structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of attaching a rear brake to the rear axle of a tractor whose body center is eccentric with respect to the center between the left and right treads.

In such tractors where the fuselage center and tread center are eccentric to each other, if a hydraulic lift device is installed on the tread center on the rear axle, the left and right weight will be balanced, the weight will be distributed almost equally to each wheel, and the traction force will be increased. There are advantages such as increased

However, around the side wall of the rear case on the tread center side, where the transmission mechanism and differential gear are housed, the rear case,
Alternatively, it is necessary to provide piping to supply the hydraulic oil stored in the transmission case to the hydraulic lift device or return it.

Therefore, if a brake device is to be disposed between the rear case side wall portion on the tread center side and the tread center, the piping becomes an obstacle and the structure of the brake link installation becomes considerably complicated.

In view of the above points, the present invention aims to make it possible to easily attach a rear brake device to the rear axle even if a hydraulic lift device is mounted on the tread center of the rear axle. .

The rear axle here is used to refer to the whole thing that connects and supports the left and right rear wheels.

The configuration of the present invention will be explained below based on the drawings showing one embodiment.

1. Fig. 1 shows the entire tractor of the present invention, in which an engine 1 is mounted on the front of the machine body, a clutch housing 2 is mounted on the rear of the engine, and a transmission case 3 as a rear case is mounted on the rear of the engine. The power from the engine 1 is transmitted to the transmission mechanism in the transmission case 3 via the clutch and main shaft installed in the clutch housing 2, and from the transmission mechanism to the rear via the differential. It is designed to drive wheel 4.

In the figure, 5 is a front wheel, 6 is a steering wheel, and 7 is a seat.

As shown in this drawing, the body center indicated by 8 does not coincide with the center 9 between the left and right treads, but is eccentrically placed to the left in the direction of travel of the tractor.

Figure 2 shows the structure of the rear axle in this case, and as mentioned above, 3 is a transmission case as a rear case, and on both left and right sides of this mission case 3 there are differential carriers 10° that protrude inward. 10 is attached, and further,
A brake cam plate 11 is attached to the side wall of the mission case 3 on the eccentric side with bolts 12, and a roughly L-shaped rear axle case 1 is installed on the outside thereof.
3 is attached by the same bolt 12 as above.

14 penetrates the brake cam plate 11,
This is an intermediate axle as a transmission shaft supported between the differential carrier 10 and the rear axle case 13. Although not shown, a differential side gear is attached to the inner end of the intermediate axle to receive power from the engine 1. A final pinion 15 is provided at the end.

The final pinion 15 meshes with a final gear 16, and the final gear 16 is spline-fitted to a rear wheel shaft 17 supported at the bottom of the rear axle case 13 to perform final deceleration. 18, the tire 21 via the disc 19 and the rim 20
It transmits driving force to.

FIG. 3 shows details of the brake device installed between the side wall of the mission case 3 and the rear axle case 13 on the eccentric side.

A camshaft 22 is rotatably attached to a brake cam plate 11 which is sandwiched between the side wall of the transmission case 3 and the rear axle case 13, and a brake lever 23 is mounted on the inside of the camshaft 22. is fixed, and the upper end of the brake lever 23 is made to protrude from a through hole 24 formed on the upper surface between the brake cam plate 11 and the tension case 3, and the brake lever 23 is operated with an appropriate operating tool. By rotating the camshaft 22, the camshaft 22 is rotated.

Reference numeral 25 designates a brake drum which is spline-fitted to the intermediate axle 14 outside the cam plate 11 and inside the rear axle case 13, and is pivotally supported inside the brake drum 25 by an anchor pin 26. The brake shoe 27 is installed inside the vehicle, and is expanded by the surface of the cam 28 formed at the tip of the camshaft 22, thereby braking the intermediate axle 14.

In addition, 29 is the brake device section and the final gear 1.
5, a partition is formed on the rear axle case 13, 30 is a seal provided between the partition 29 and the intermediate axle, and 31 is a seal interposed between the brake cam plate 11 and the intermediate axle 14. A bearing 32 is a seal interposed between the differential carrier 10 and the intermediate axle 14, and 33 is a needle bearing.

Now, returning to FIG. 2 and explaining, a rear axle housing 34 of a slightly larger diameter is directly connected to the side wall of the □ tension case 3 on the opposite side to the eccentric direction side, that is, on the tread center 9 side, by bolts 35. , protrudes in the direction of the tread center 9.

Therefore, between the outer end of this rear axle housing 34 and the rear axle case 13 on the side opposite to the body center 8 with respect to the tread center 9, there is provided a plate having the same structure as the brake cam plate 11 on the eccentric direction side, and An identical brake cam plate 11 made of the same parts is interposed and attached by bolts 36.

37 is transmission case 3 and rear axle case 13
A long intermediate axle is provided between the rear axle housing 34 and the rear axle housing 34, and a brake drum 25 is attached to this intermediate axle 37 on the outside of the brake cam plate 11. The fact that the brake shoes 27 are installed internally is the same as on the eccentric direction side, and the structure thereof is also the same.

38 is a hydraulic lift device mounted on the rear axle housing 34 at the tread center 9, 39 is a lift arm thereof, and 40 is formed in the rear axle housing 34 in order to return the hydraulic fluid of the hydraulic lift device 38 into the transmission case 3. This shows the return oil path.

The present invention has the above-mentioned configuration, in which a squirrel axle housing is provided on the side wall of the rear case on the tread center side, protruding toward one direction of the tread center, and a hydraulic lift device is mounted on the rear axle housing at the tread center. A brake device is attached to the outer end of the rear axle housing on the opposite side of the tread center from the fuselage center via a brake cam plate.

Therefore, there is no need to provide a special member to mount the hydraulic lift device, and the weight applied to each wheel is distributed almost evenly, increasing the traction force. Even if piping is provided to supply hydraulic oil to the hydraulic lift device and return it to the rear case, the brake device cannot be operated at a remote location on the opposite side of the tread center, i.e. around the outer edge of the rear axle housing. Since the link mechanism and the like can be provided, the brake device can be easily installed without complicating the structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of the tractor of the present invention, FIG. 2 is a longitudinal sectional view of its rear axle, and FIG. 3 is an enlarged view of two parts of FIG. 2. 3... Mission case, 8... Aircraft center, 9... Tread center, 11...
...Brake cam plate, 13...Rear axle case, 14°37...Intermediate axle, 1
7... Rear wheel axle, 25... Brake drum, 26... Anchor pin, 27...
・Brake shoe, 28...Cam, 34...
...Rear axle housing, 38...0. Hydraulic lift device.

Claims (1)

[Scope of utility model registration request] For tractors whose body center is eccentric with respect to the center between the left and right treads, a rear axle housing housing a transmission shaft is installed protruding from the side wall on the tread center side of the rear case, which is installed at the body center and houses a differential gear. At the tread center, a hydraulic lift device is mounted on the rear axle housing, and an outer end of the rear axle housing protrudes on the side opposite to the fuselage center with respect to the tread center, and another end on the eccentric direction side of the rear case. The tractor brake mounting structure is characterized by a rear axle case that houses the rear wheel axle, with a brake cam plate interposed between each side wall.