JPH032737Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a sealing device for a universal joint, in particular,
The present invention relates to a sealing device for a universal joint in which one end of the sealing device is movably attached to an outer joint member of the universal joint.

[Prior art]

Generally, the state in which a sealing device is attached to a universal joint is as shown in FIGS. 3 and 4.

That is, in the case shown in FIG. 3, the universal joint 17 has a driving shaft 19 of the inner joint member and a driven shaft 20 connected to the outer joint member 18.
The driving shaft 1 is configured to cover the drive shaft 1.
9 is transmitted to the driven shaft 20 via the universal joint 17,
The joint angle at the universal joint 17 between the central axis of the driving shaft 19 and the central axis of the driven shaft 20 can freely change from 0 degrees to the maximum possible angle.

A sealing device 11 is provided on the driving shaft 19 side of the universal joint 17, and the sealing device 11 has an enlarged opening edge 13 at one end,
The other end is an opening edge 14, and the enlarged opening edge 13
A bellows portion 12 is formed between the opening edge portion 14 and the bellows portion 12, and the bellows portion 12 has concave portions 12a, 12b, 1
2c, and further includes the enlarged opening edge 1
3 is attached to the outer joint member 18, and the opening edge 14
are fastened and fixed to the driving shaft 19 of the inner joint member by fixing members 23, respectively.

Moreover, FIG. 4 shows the state when the joint angle of the universal joint 17 is α in the aforementioned universal joint sealing device.

[Problem that the invention attempts to solve]

However, in the conventional universal joint sealing device as described above, since the sealing device is fixed to the joint member, the joint angle α in the universal joint
If this becomes large, contact will occur in the concave part of the bellows part of the sealing device, causing wear and tear, and distortion of the concave part of the bellows part will increase, and the bellows part on the opposite side will be stretched, causing fatigue damage. There was a problem.

This invention solves the above-mentioned problems of the conventional devices, and is designed so that a part of the sealing device can be displaced relative to the universal joint as the joint angle of the universal joint changes, and the bellows part of the sealing device It is an object of the present invention to provide a sealing device for a universal joint that can improve wear resistance and fatigue resistance by reducing strain and improving wear resistance and fatigue resistance by reducing contact at the joint and by reducing tension.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention uses an elastic material that seals between the outer joint member of the universal joint and the drive-side shaft of the inner joint member that can be displaced at a predetermined angle of inclination with respect to the outer joint member. The outer joint member has an outer surface formed into a spherical surface, an end portion on the drive side shaft side protrudes like a brim to form a stopper portion, and the outer joint member has a spherical surface. An annular collar is disposed on the outside of the processing part with an O-ring interposed therebetween, and is movable within the range where it comes into contact with the stopper part, and an opening edge at one end of the sealing device is attached to the outer periphery of the annular collar. is fitted and fixed so that the opening edge at one end can always be positioned outside the spherical processed part of the outer joint member, and the opening edge at the other end of the sealing device is fitted into the driving shaft. It has a fixed configuration.

[Effect]

In the universal joint sealing device of this invention constructed as described above, the opening edge at one end of the sealing device made of an elastic body is movable relative to the outer joint member in accordance with the displacement of the joint angle of the universal joint. Even if the joint angle of the universal joint becomes large, it is possible to reduce contact and tension at the bellows portion of the sealing device, reduce distortion, and improve wear resistance and fatigue resistance.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

FIG. 1 shows the state in which the sealing device 1 according to this invention is attached to a universal joint 7, and FIG. 2 shows the state of the joint angle α in the universal joint.

First, the universal joint 7 is configured to cover a driving shaft 9 of the inner joint member and a driven shaft 10 connected to the outer joint member 8.
A spherical processed portion 8a is formed on the surface of the drive shaft 19 of the outer joint member 8.
A stopper 21 projecting like a brim is provided at the side end, and the rotational force of the driving shaft 9 is further transmitted to the driven shaft 10 via the universal joint 7. , the joint angle at the universal joint 7 between the central axis of the driving shaft 9 and the central axis of the driven shaft 10 is 0.
It is designed to be able to freely change from a degree to the maximum possible angle.

A sealing device 1 is provided on the driving shaft 9 side of the universal joint 7, and the sealing device 1 has an enlarged opening edge 3 at one end and an opening edge 4 at the other end, A bellows portion 2 is formed between the enlarged opening edge 3 and the opening edge 4, and the bellows portion 2 is formed of recesses 2a, 2b, and 2c, and the driving shaft 9 can pass through the inside thereof. The elastic material is more flexible.

Between the spherical processed portion 8a of the outer joint member 8 and the enlarged opening edge 3, O-rings 5 are installed at two locations, and a hard ring collar 6 is movably attached to the O-ring 5 to the spherical processed portion 8a. The enlarged opening edge 3 is tightened with a tightening member 22 with the O-ring 5 being made of hard resin, resin, rubber,
Alternatively, it may be made of metal or the like, and the material can be selected as appropriate.

The opening edge 4 is fastened and fixed to the drive shaft 9 by a fixing member 23.

Further, FIG. 2 shows a state in which the enlarged opening edge 3 has moved by an angle β with respect to the outer joint member 8 when the joint angle of the universal joint 7 is α in the aforementioned universal joint sealing device.

Next, the operation of the above will be explained.

In the sealing device for the universal joint of the present invention shown in FIG. 1, as described above, there is a
As shown in FIG. 2, the enlarged opening edge 3 is movably attached to the spherical processed portion 8a with the O-ring 5 and collar 6 interposed therebetween. When the angle becomes α, the enlarged opening edge 3 slides in the direction of the arrow to the position where the collar 6 on the pulled side is stopped by the stopper 21, that is, to the angle β in FIG. Therefore, the recesses 2a, 2 of the bellows part 2
Since the contact at b and 2c and the amount of tension on the opposite side can be reduced to reduce distortion, it is possible to improve the wear resistance or fatigue resistance of the sealing device of the universal joint. This is the result. Further, the enlarged opening edge 3 is fixed integrally with the collar 6 by a tightening member 22, and the stopper 21 provided on the outer joint member 8 of the universal joint is located outwardly from the collar 6. Since it protrudes, there is no risk that the collar 6 will come off beyond the stopper 21, so there is no chance that the enlarged opening edge 3 will come off the outer joint member 8, and therefore the joint angle of the universal joint can be adjusted. No matter what kind of displacement, sealing can be achieved reliably.

In addition, in the embodiment, the enlarged opening edge 3
Although a configuration is shown in which the O-ring 5 uses collars 6 at two locations to movably attach the O-ring 5, the O-ring 5 may be attached at any number of locations, and the enlarged opening edge 3 may be movably attached. Of course, anything other than an O-ring may be used as long as it is possible.

[Effect of idea]

By configuring this idea as described above,
A sealing device made of a single elastic body can reduce contact and tension on the bellows part, thereby reducing distortion and improving wear resistance and fatigue resistance. The edge of the opening at one end is fixed in a fitted state to a collar that is always located outside the spherical opening of the outer joint member in a sealed state without detaching, so the amount of movement is small and durability is good. In addition, it is extremely simple to move the collar by using only the stopper provided on the spherical processing part, and the sealing state can be maintained reliably no matter how the joint angle of the universal joint changes. have an effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a sealing device for a universal joint according to this invention, Fig. 2 is a sectional view of the sealing device for a universal joint according to this invention at a joint angle α, and Fig. 3 is a sectional view of a sealing device for a universal joint according to this invention.
The figure is a sectional view of a conventional universal joint sealing device, and Figure 4 shows a conventional universal joint sealing device with a joint angle α
FIG. 1, 11... Sealing device, 2, 12... Bellows part,
2a to 2c, 12a to 12c... recess, 3, 13
... Enlarged opening edge, 4, 14... Opening edge, 5...
... O-ring, 6 ... Collar, 7, 17 ... Universal joint, 8, 18 ... Outer joint member, 8a ... Spherical surface processing part, 9, 19 ... Drive side shaft, 10, 20 ...
...Driver side shaft, 21...Stopper, 22...
Tightening member, 23...Fixing member.

Claims (1)

[Scope of utility model registration request] Outer joint member 8 of universal joint 7 and outer joint member 8
A sealing device 1 is made of an elastic body that seals between an inner joint member that can be displaced at a predetermined inclination angle with respect to a driving shaft 9, and the outer surface of the outer joint member 8 is formed into a spherical processed portion 8a. At the same time, the end portion on the drive side shaft 9 side protrudes like a brim to form a stopper portion 21, and an annular collar is formed on the outside of the spherically processed portion 8a of the outer joint member 8 with an O-ring 5 interposed therebetween. 6 is disposed so as to be movable within the range where it contacts the stopper part 6, and the one end opening edge of the sealing device 1 is fitted and fixed on the outer periphery of the annular collar 6, and the one end opening edge is fixed. Always keep the outer joint member 8
It can be positioned outside the spherical processed portion 8a, and
A sealing device characterized in that the other end opening edge of the sealing device 1 is fixed in a state where it is fitted onto the driving shaft 9.