JPH0249386Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a cover for a propeller shaft that transmits the power of a tractor to a working machine, for example.

(Prior art and its problems) Figure 4 shows a conventional propeller shaft cover. In this example, a drive side yoke 1 connected to an output shaft of a tractor and a propeller shaft side yoke 2 are connected by a universal joint 3, and a propeller shaft 4 is connected to the yoke 2. As seen in FIG. 4, the input shaft of the tractor is connected to the right end of the propeller shaft 4 through the same structure as the illustrated yokes 2, 1 and universal joint 3. In this example, since the propeller shaft 4 has a structure that can be expanded and contracted, it is provided with a cover 5 that has a double structure that can be expanded and contracted.

As is clear from FIG. 4, a grease nipple 6 is provided for lubricating the universal joint. Such tractors and working machines pose a danger of workers' hands getting caught in the rotating propeller shaft, and they are also used in areas with a lot of dirt, plants, and dust, which can get caught in the rotating parts. Therefore, as shown in the figure, the end of the propeller shaft, the universal joint, etc. are protected by the inner cover 7 and outer cover 8. Although various materials are used for the inner cover 7 and outer cover 8, the illustrated example is made of polyester. Since the inner cover 7 and the outer cover do not rotate even when the propeller shaft rotates, a support with low friction such as a ball 9 is inserted between them. This ball 9 is supplied with oil from a grease nipple 10.

As mentioned above, since the end of the propeller shaft and the universal joint are doubly surrounded by the inner cover 7 and the outer cover 8, the inner cover and the outer cover are used to supply oil to the grease nipple 6 of the universal joint. Holes 11 and 12 are formed in each, and oil is supplied through these holes.

In this structure, when attaching the inner cover 7 and the outer cover 8, the inner cover 7 is first attached, and then the outer cover 8 is attached by sliding it over the inner cover 7 from the right side to the left side as seen in FIG. Since the outer cover 8 has a bellows shape to increase its strength, when the bellows portion passes through the largest diameter portion of the inner cover 7, it may receive a large resistance and may be difficult to attach. Also, during rotation, the inner cover may break, and its fragments may enter the rotating parts and have an undesirable effect on the rotation of the propeller shaft.

Further, the ball 9 requires a retainer or the like, making assembly difficult.

(Configuration of the invention to solve the problem) In order to solve this problem, the propeller shaft cover of the present invention connects the shaft end of the propeller shaft 4 and the universal joint 3 connected to this shaft end to the inner cover 7.
In a propeller shaft cover that is surrounded by an outer cover 8 and supplies oil to the universal joint 3 through a hole 12 provided in the outer cover 8, the inner cover 7 and the outer cover 8 are connected to the propeller shaft 4. The inner cover 7 is characterized in that the inner cover 7 is provided with a cutout portion 13 that is open at one end so as to align with the hole 12 of the outer cover 8 when attached to the shaft end.

In addition, in the present invention, the yoke 2 on the side of the propeller shaft 4
A nylon slide ring 14 is inserted between the ball and the inner cover 7 instead of the ball.

(Function) In the present invention, since the inner cover 7 is provided with the cutout portion 13 with one end open, the hole 1 of the outer cover 8
2. Oil can be supplied through this cutout, and the inner cover 7 is easily deformed due to the cutout, making it easier to attach the outer cover. Also, the inner cover becomes easily deformed,
Due to the increased elasticity, the inner cover is less likely to be damaged during rotation of the propeller shaft.

Furthermore, since a slide ring made of nylon or the like is inserted between the yoke 2 and the inner cover instead of the conventional ball, assembly is very easy.

(Example) FIG. 1 shows an example of the present invention. In Figure 1, the 4th
The same parts as in the figure are indicated by the same symbols. In the present invention, a cutout 13 is provided in place of the oil supply hole 11 of the inner cover 7. Details of the inner cover 7 are shown in FIGS. 2a and 2b. Although the number of cut portions 13 is not necessarily limited to this, three is preferable.

In the present invention, a slide ring 9 made of, for example, nylon is inserted between the yoke 2 and the inner cover instead of the ball 9 shown in FIG. The slide ring 9 can also be formed integrally with the inner cover.

FIG. 3 shows a cross section of the outer cover 8. still,
The outer cover 8 may have a straight cross section other than a bellows shape.

(Effect of the invention) As described above, by providing the cutout portion 13 on the inner cover 7, the maximum diameter portion of the inner cover 7 is easily deformed, so when attaching the outer cover after attaching the inner cover, the outer The cover can be easily passed over the inner cover, making assembly easier. Also, the excised part 1
By providing 3, the inner cover becomes easier to deform, that is, its elasticity increases, which has the effect of preventing the inner cover from being damaged during rotation of the propeller shaft. Furthermore, since a slide ring 14 made of nylon or the like is provided in place of the ball 9, assembly is greatly facilitated.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the propeller shaft cover of the present invention, Fig. 2 a and b are sectional views and side views of the inner cover of Fig. 1, respectively, and Fig. 3 is a sectional view of the outer cover of Fig. 1. FIG. 4 is a sectional view of a conventional propeller shaft cover. 1, 2...Yoke, 3...Universal joint, 4...Propeller shaft, 5...Cover, 6...
Grease nipple, 7...Inner cover, 8
... Outer cover, 9 ... Ball, 10 ... Grease nipple, 11 ... Hole, 12 ... Hole, 13
...Resection part, 14...Slide ring.

Claims (1)

[Claims for Utility Model Registration] 1. The shaft end of the propeller shaft 4 and the universal joint 3 connected to this shaft end are connected to the inner cover 7.
and an outer cover 8, and in which the universal joint 3 is supplied with oil through a hole 12 provided in the outer cover 8, the inner cover 7 and the outer cover 8 are connected to the propeller shaft 4. A propeller shaft cover characterized in that the inner cover 7 is provided with a cutout portion 13 having one end open so as to fit into the hole 12 of the outer cover 8 when attached to the shaft end. 2. The propeller shaft cover according to claim 1, wherein a slide ring 14 is interposed between the yoke 2 on the side of the propeller shaft 4 and the inner cover 7.