JPS5933686Y2 - Tractor axle support structure - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a final gear reduction mechanism on the outside of the left and right side walls of the differential gear case, and an axle shaft having a flange-like cover part that covers this gear transmission mechanism and a cylindrical part for passing the axle through. The case is attached to the outside of the side wall of the differential gear case, and an axle having a flange for attaching wheels at the outer end is inserted from the outer end of the cylindrical part to be interlocked and connected to the gear reduction mechanism, and the case is provided on the left and right side walls of the differential gear case. The present invention relates to a tractor axle support structure configured to horizontally support an axle by an inner bearing part and an outer bearing part provided near the outer end of an axle case cylindrical part.

In the above-mentioned axle support structure, it is necessary to support the flanged axle inserted from the outer end of the axle case at the inner and outer bearing portions so as to prevent the axle from slipping out. An example of such a conventional structure is shown in FIG. 3.

In this case, the inner bearing part B has a structure in which the bearing 31 fixed to the axle 8 with a nut 30 is simply fitted and supported on the side wall of the differential gear case 5, and the outer bearing part B2 has a structure in which the bearing 31 fixed to the axle 8 with a nut 30 is supported, and the outer bearing part B2 is the bearing 31 fixed to the axle 8 with a nut 30. 32 is supported from the inside and outside by a stepped part 33 provided near the outer end of the cylindrical part 18b of the axle case 18 and a bearing retainer 34 bolted to the cylindrical part 18b, and only this outer bearing part B2 supports the inner and outer parts. The structure was designed to strongly support the thrust load of

However, this configuration requires a relatively large number of parts such as the bearing fixing nut 30, the spacer sleeve 35, the bearing holder 34, and the mounting bolt 36. Labor-intensive machining is also required, resulting in high assembly costs as a whole.

This invention focuses on the fact that the thrust load on the axle of a tractor does not necessarily act on the inside and outside in the same way.The present invention has a structure that can sufficiently withstand the inside and outside thrust loads, but has a small number of parts, is easy to assemble, and is inexpensive. This is an attempt to provide an axle support structure that can be manufactured.

Figure 1 shows a schematic plan view of an agricultural tractor, with engine 1,
A clutch housing 2, a transmission housing 3, a transmission case 4, and a differential gear case 5 are connected in series in the front and rear, and a front frame 6 attached to the engine 1 is equipped with steering front wheels 7. Rear wheels 9, 9 are attached to axles 8, 8 extending from both sides.

FIG. 2 is a plan view showing the inside of the differential gear case 5, in which the final output shifted by the transmission case 4 is transmitted to the differential transmission mechanism L1 via the bevel pinion shaft 10, and its left and right output shafts 12. 12 is pinion gear 1
3 and a final gear reduction mechanism 1, which includes a final gear 14.

Also attached to both output shafts 12.12 are brakes 17.17 operated by pedals 16.16.

The final gear reduction mechanism 15 is housed in a recess (N) formed on the outside of the left and right side walls of the differential gear case 5, and
On the outside of this recess (N), there is a seven-lunge-shaped cover portion 18a that covers the final reduction gear mechanism 1-5, and a cylindrical portion 18b for axle insertion.
An axle case 18 is fixed thereto.

The outer end of the axle 8 is integrally formed with a flange 8a for mounting a wheel, the inner end of which is supported by a bearing B1 provided on the side wall of the differential gear case 5, and the middle part of the axle is supported by an axle case cylindrical part 18b. It is supported by a bearing part B2 provided near the outer end of.

The inner bearing part B1 receives and supports the bearing 20 fitted from the outside with a stepped part 19 formed on the side wall of the differential gear case, thereby preventing the axle 8 from moving inward. The structure is structured as follows.

In addition, the outer bearing part B2 has a retaining ring 2 in the middle of the axle 8.
Bearing 23 fixed in position with 1 and collar 22
is fitted into the end of the cylindrical portion 18b from the outside, received by the stepped portion 24, and prevented from coming out by the retaining ring 25, thereby preventing the axle shaft 8 from moving inward and outward directions.

Note that a storage case portion 18c for the brake 17 is provided on the cover portion 18a of the left and right axle case 18, and
An operating shaft 27 of a differential lock mechanism 26 housed in a recess (4) is attached to a cover portion 18a of the right axle case 18 and linked to a differential lock pedal 28.

In the axle drive device having the above configuration, the axle case 1 is
The axle 8 inserted from the outside into the axle 8 is positioned and supported via only the outer bearing portion B2, and the final gear 14 is installed at the inner end of the shaft. 8. Fit the inner end of the axle case 1.
8 to the differential gear case 5, the axle is assembled.

In addition, the brake 17 and the output shaft 12 are also attached to the axle case 18 in advance.
and perform the above operations.

In the axle 8 assembled in the above manner, the inward thrust load is applied to the inner and outer bearing portions B1. It is supported by the bearing receiving steps 19 and 24 in B2, and the outward thrust load is supported by both retaining rings 21 and 25 of the outer bearing part B2, but particularly large thrust loads are generated in the rear part. This is an inward thrust load when the outside of the ring 9 comes into contact with a ridge or other object, and the outward thrust load is mostly when passing through irregularities on the ground or during application, and is greater than the above-mentioned inward thrust load. Since the outer thrust load is sufficiently small, even the retaining rings 21 and 25 can sufficiently support the outer thrust load.

Particularly, when the distance between the inner and outer bearing parts B1 and B2 is large, the axle 8 is less likely to twist, and for this reason, the retaining ring 21.2
The stopper function of No. 5 is more reliably demonstrated.

In summary, the present invention uses the stepped portion of the differential gear case to support the axle with seven flange, which is inserted and fixed from the outer end of the axle case, using the inner and outer bearing parts so as not to come out. The outer bearing part has a structure that uses a retaining ring to prevent the axle from moving outward, and the inner bearing part Although it can be strongly resisted by
The outer bearing part has a retaining structure that uses a simple retaining ring, which has fewer parts and is easier to assemble than the conventional structure mentioned above, and it is now possible to drive the axle with one support without the need for practical support. .

[Brief explanation of drawings]

The drawings illustrate embodiments of the tractor axle support structure according to the present invention, and FIG. 1 is a schematic plan view of an agricultural tractor, and FIG.
The figure is a cross-sectional plan view of the differential gear case, and FIG. 3 is a cross-sectional plan view showing the main parts of the conventional structure. 5...Differential gear case, 8...Axle,
8a... Flange, 15... Final gear reduction mechanism, 18... Axle case, 18a...
...Cover part, 18b: ...Cylinder part, 19...
...Stepped portion, 21.25...Retaining ring, B1
．． B2...Bearing part.

Claims (1)

[Scope of utility model registration request] An axle case 18 in which a final gear reduction mechanism 1-5 is disposed on the outside of the left and right side walls of the differential gear case 5, and has a flange-shaped cover portion 18a that covers the gear transmission mechanism 1-5 and a cylindrical portion 18b for inserting the axle. is attached to the outside of the side wall of the differential gear case 5, and the axle 8 has a flange 8a for wheel attachment at the outer end.
is inserted from the outer end of the cylindrical portion 18b to be interlocked and connected to the gear reduction mechanism U, and an inner bearing portion B1 provided on the left and right side walls of the differential gear case 5 and an outer bearing portion provided near the outer end of the axle case cylindrical portion 18b In a tractor axle support structure in which the axle 8 is horizontally supported by the bearing part B2, the inner bearing part B1 connects the inward thrust movement of the axle 8 using the stepped part 19 of the side wall of the differential gear case 5. An axle support structure for a tractor, characterized in that the outer bearing portion B2 has a structure that abuts against and prevents outward thrust movement of the axle shaft 8 by means of retaining rings 21 and 25.