JPH0131809Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a dust seal for a flexible shaft joint that connects a driving shaft and a driven shaft having relative displacement.
In particular, the present invention relates to a dust seal for a flexible shaft joint that is suitable for a flexible shaft joint installed in a bogie of a railway vehicle.

[Background of the idea]

Conventionally, in a bogie for a railway vehicle, a flexible gear joint or the like has been used to connect an electric motor as a drive source and a gear device as a driven shaft. (For example, Japanese Utility Model Application No. 50-61240) However, since this gear joint has a long axial dimension, it is necessary to secure an installation space. In particular, in the case of parallel cardan type carts, it has been difficult to secure the installation space. Therefore, a wobble plate type shaft joint has been developed to solve the above-mentioned problems. The structure of the shaft joint is such that flexible plates are joined via spherical bearings, and the relative displacement between the driving shaft and the driven shaft is allowed by deformation of the spherical bearings and the plates. ing. By the way, it is necessary to protect the spherical bearing part from dust, and a dust seal is provided, but the dust seal has a long axial length to allow displacement of the bearing part, or a bag-like shape. was formed. However, the above configuration has disadvantages such as the need to secure installation space and the manufacturing time.

[Purpose of invention]

In view of the above points, the present invention aims to make the structure of a dust seal provided in a flexible shaft joint small and simple.

[Summary of the idea]

The present invention is installed across both an axial direction and a circumferential orthogonal gap concentric with the spherical bearing, which is provided between members connected by a spherical bearing, and has an L-shaped cross section, It is characterized in that a U-shaped groove is formed at the center of the concave portion of the L-shaped cross section.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 3. Fig. 1 is a cross-sectional view of a spherical bearing section showing an embodiment of the dust seal according to the present invention, Fig. 2 is an enlarged cross-sectional view of section A in Fig. 1, and Fig. 3 is a cross-sectional view of a spherical bearing section showing an embodiment of the dust seal according to the present invention. FIG. 3 is a plan view of the truck showing the installation state of the flexible shaft joint. In the figure, since the truck is a so-called inboard truck that supports a truck frame 1 inside the wheels via journal bearings, the width of the truck frame 1 is narrow. Therefore, the drive device 2 or electric motor 3 to be housed inside the bogie frame 1 is required to be compact, and furthermore,
The shaft joint that connects them is also required to have a short axial dimension. A wobble plate 4 is provided as this shaft joint. The structure of the connecting portion of the wobble plate 4 is such that the wobble plate 4 and a bolt 8, which is a fixing means thereof, are connected via a spherical bearing 6. A dust seal 5 is provided across an axial gap and a circumferential gap formed between the wobble plate 4 and the spacer 7 fitted with the bolt 8. By the way, the cross section of the dust seal 5 is L.
It is made of a letter-shaped elastic body such as rubber, and a U is formed at the center of the recess, that is, at a position corresponding to the tip of the orthogonal contact surface of the wobble plate 4.
A letter-shaped groove is formed. Note that the members that come into contact with the dust seal 5 are not limited to the wobble plate 4 and the spacer as described above, but may be members that are connected via the spherical bearing 6 and have relative displacement. , any material may be used as long as it can form the orthogonal gaps.

According to such a configuration, the dust seal 5 is L
A wobble plate 4 formed with a letter-shaped cross section and a wobble plate 4
Since it is provided astride the orthogonal gap formed by the spacer 7 and the spacer 7, displacement in the axial direction or circumferential direction can be prevented and reliable sealing can be performed. In addition, since the dust seal 5 has a U-shaped groove formed at the center of the concave portion corresponding to the tip of the convex portion formed by the orthogonal contact surfaces of the wobble plate 4, some dimensional errors may occur. Even if the wobble plate 4 and the spacer 7 are covered, the followability to the wobble plate 4 and the spacer 7 can be improved. This also allows for relative displacement between the wobble plate 4 and the spacer 7 to ensure reliable sealing. Therefore, in order to improve sealing performance, there is no need to widen the contact surface, and the entire dust seal 5 can be configured compactly.

[Effect of idea]

As explained above, according to the present invention, it is possible to provide a dust seal for a flexible shaft joint that is small and has a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a spherical bearing equipped with an embodiment of the dust seal according to the present invention, FIG. 2 is an enlarged cross-sectional view of part A in FIG. 1, and FIG. FIG. 2 is a plan view of a truck equipped with a flexible shaft joint. 4... Wobble plate, 5... Dust seal, 6... Spherical bearing, 7... Spacer, 8... Bolt.

Claims (1)

[Scope of utility model registration request] In a dust seal for a flexible shaft joint that connects shafts having relative displacement using a spherical bearing, an axial and circumferential dust seal concentric with the spherical bearing is provided between members connected by the spherical bearing. It is installed across both orthogonal gaps, the joint surface is L-shaped, and there is a U at the center of the recess of the L-shaped cross section.
A dust seal for flexible shaft joints characterized by a letter-shaped groove.