JP2531125Y2 - Propulsion device between axles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a propulsion shaft device between axles.

(Prior Art) In a large vehicle having a long wheelbase, the propulsion shaft connecting the driving axle and the driven axle also becomes long, and when this rotates at high speed, some imbalance causes the shaft to bend and vibrate, thereby reducing noise. There was a problem that it occurred and eventually resulted in breakage. Therefore, as shown in FIG. 3, for example, the propulsion shaft 1 is divided into a front, a rear and three shafts 1A to
There is a known type in which the intermediate shaft 1C is divided into 1C and the intermediate shaft 1C is supported on the vehicle body side via center bearings 2A and 2B (see Japanese Utility Model Application Laid-Open No. 61-46237).

In this case, the intermediate shaft 1C has small diameter portions formed at both ends.
As shown in FIG. 4, the bearings 3A and 3B are rotatably supported by the center bearings 2A and 2B, and the small-diameter portions 3A and 3B have an error in the mounting position and the manufacturing dimension with respect to the center bearings 2A and 2B. A predetermined play is set in the axial direction for absorption.

The center bearings 2A and 2B are mounted in the case 4 via the holder 5 and the insulator 6. 7A, 7
B is the intermediate shaft 1C with the front and rear shafts 1A
And 1B, a spline portion for absorbing fluctuations in the length of the propulsion shaft 1, and 9 an oil seal.

(Problems to be Solved by the Invention) By the way, in general, a large vehicle having an axle suspension type suspension structure is configured so that the expansion and contraction of the propulsion shaft accompanying the vertical movement of the axle is allowed by the spline portions 8A and 8B. However, when driving force is applied, spline parts 8A, 8B
, A relatively large frictional force is generated, so that the stretching force from the axle side is transmitted to the intermediate shaft 1C side. On the other hand,
The intermediate shaft 1C moves in the axial direction within a range of the small diameter portions 3A and 3B with respect to the center bearings 2A and 2B. For this reason, in the conventional device, the splines 8A and 8B must be formed long by the useless movement of the intermediate shaft 1C, and the step surfaces of the small-diameter portions 3A and 3B have the center bearings 2A and
There is a problem that the 2B oil seal 9 is damaged, and the life and quality are reduced.

(Means to solve the problem) This invention solves such a conventional problem,
A propulsion shaft device between at least three shafts including a shaft having a spline portion connected to a final gear of a driven axle and a driven axle of an axle-suspended vehicle, and an intermediate shaft interconnecting these shafts. And a plurality of bearing means for rotatably supporting the front and rear portions of the intermediate shaft on the vehicle body side and preventing axial movement.

(Operation) The intermediate shaft is also prevented from moving in the axial direction by a plurality of front and rear bearing means rotatably supporting the intermediate shaft on the vehicle body side.
Thus, the spline length is minimized and the life of the seals and bearings is improved.

(Embodiment) FIG. 1 shows an embodiment in which the invention is applied to a large-sized bus after an engine. An output shaft 11 of a transmission 10 is connected to a final gear 13 of a rear wheel 12 and further to a final gear of a front wheel 15 via a propulsion shaft 14. Connected to 16.

The propulsion shaft 14 includes front and rear shafts 14A and 14B and an intermediate shaft portion 14C. In this case, the intermediate shaft portion 14C is divided into two parts at the center of the shaft, and each end is the same as before. The center bearings 17A, 17B having the configuration are supported on the vehicle body via the small diameter portions 18A, 18B.

And the shaft 19A before and after the intermediate shaft portion 14C
19B is connected via a pillow block 20. As shown in FIG. 2, the pillow block 20 is located on both sides of a rotating shaft 22 having companion flanges 21A and 21B at both ends, and a large-diameter portion 23 formed at the center of the rotating shaft 22, and is free to rotate. And a pair of bearings 24A, 24B arranged to prevent movement in the axial direction, and a housing 25 for supporting these bearings 24A, 24B. Made, vibration of the propulsion shaft 14,
(Suppresses the transmission of noise and the like to the vehicle body). 27A to 27F are universal joints, 28A and 28B are spline portions for absorbing fluctuations in the length of the propulsion shaft 14, and 29 is an oil seal.

With such a configuration, the intermediate shaft portion 14C is prevented from being moved in the axial direction by the pillow block 20 that rotatably supports the intermediate shaft portion 14C on the vehicle body side. Does not collide with the center bearings 17A, 17B, causing noise (hitting sound) and breakage of the oil seal 29, and the length of the spline portions 28A, 28B can be reduced. The intermediate shaft portion 14C can be substituted by the rotating shaft 22 of the pillow block 20, and in that case, the center bearings 17A and 17B can be eliminated, which is advantageous in cost.

(Effects of the Invention) In summary, according to the invention, at least a shaft having a spline portion connected to a final gear of a driven axle and a driven axle of an axle-suspended vehicle, and an intermediate shaft connecting these shafts to each other. A propulsion axle device comprising three or more shafts is provided between the axles, and a plurality of bearing means for rotatably supporting the front and rear portions of the intermediate shaft on the vehicle body side and preventing axial movement are provided. In addition to minimizing the length of the spline part that absorbs fluctuations in shaft length, preventing the generation of noise from the propulsion shaft, and improving the durability of bearings and seals, it is unique to axle suspension vehicles. The effect of avoiding inconvenience and improving the reliability of the device can be obtained.

[Brief description of the drawings]

FIG. 1 is a structural view showing an embodiment of the present invention, FIG. 2 is a sectional view of a pillow block, FIG. 3 is a partial structural view showing a prior art, and FIG. 4 is a sectional view of a center bearing. 12 ... rear wheel, 14 ... propulsion shaft, 14C ... middle shaft part, 15 ... front wheel, 20 ... pillow block.

Claims (1)

(57) [Scope of request for utility model registration] An axle comprising at least three shafts, a shaft having a spline portion connected to a final gear of a driven axle and a driven axle of an axle-suspended vehicle, and an intermediate shaft connecting these shafts to each other. A propulsion shaft device between axles, wherein a plurality of bearing means for rotatably supporting the front and rear portions of an intermediate shaft on a vehicle body side and preventing axial movement are provided.