JPH0642206Y2 - Rotation speed detector - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention has been improved in a hermetically-sealed rotational speed detecting device such that a connecting wire drawn from a detector can be attached in advance to a coupler for connecting to an external connecting wire. Regarding what you did.

[Conventional technology]

A conventional example of a rotation speed detecting device having a closed structure will be described with reference to FIG. In this figure, a rotation speed detector 3 such as a pulse encoder, a tachometer generator, a resolver or the like is attached to the outer surface of a bracket 2 that supports the rotating shaft 1, and this detector 3 is a U-shape attached to the outer peripheral portion of the bracket 2. It is surrounded by a cover 4 having a closed structure having a cross section so as to prevent dust, water, oil, etc. from entering. The connecting wire 5 drawn out from the detector 3 is connected to a coupler 6 which is connected to an external connecting wire (not shown), and the coupler 6 has a packing made of an elastic material such as rubber in an opening 4a provided in the outer peripheral portion of the cover 4. It is attached via 7.

[Problems to be solved by the invention]

In the above structure, it is necessary to pull out the connecting wire 5 from the opening 4a of the cover 4 with a sufficient length for easy connection work before connecting the cover 4 to the bracket 2, and connect the connecting wire 5 to the coupler 6. However, there is a drawback in that the margin of slack becomes slack and may be damaged by contact with the rotating part.

In order to eliminate the above-mentioned drawbacks, the present invention has a hermetically-sealed rotational speed detecting device in which a connecting wire drawn out from a detector can be preliminarily attached to a coupler connecting to an external connecting wire with a length that does not cause slack. The purpose is to provide.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention has a bracket 2 having an opening 4a provided in an outer peripheral portion of a cover 4 having a U-shaped cross section.
The side is notched with an appropriate width, and the opening is formed in the packing 17 inserted between the coupler 6 for connecting the connection line 5 drawn from the detector 3 and the external connection line and the opening 4a for mounting the coupler 6.
A protrusion 17a that is inserted into the notch 18 of the 4a and closes the notch 18 is integrally formed.

[Action]

If the notch 18 of the opening 4a is formed to have an appropriate width so that the connecting wire 5 connected to the coupler 6 can be inserted in the axial direction, the connecting wire 5 can be preliminarily attached with a length that does not cause slack. And the notch 18 is the packing after the connecting wire 5 is inserted.
It can be closed by the protrusion 17a of 17 to form a closed structure.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and the same reference numerals as those in FIG. 2 are the same parts. In this figure, an opening 4a is provided on the outer peripheral portion of the cover 4 having a U-shaped cross section, and a coupler 6 for connecting the connection line 5 drawn from the detector 3 and an external connection line (not shown) to the opening 4a is elastic. It is designed to be attached via packing 17. The opening 4a
Is formed with a notch 18 having an appropriate width on the side of the bracket 2 through which the connecting wire 5 can be inserted in the axial direction.
The notch 17 has a protrusion 17a that is inserted into the notch 18 and closes it.
Are integrally formed. The notch 18 and the protrusion 17a are formed in a wedge shape so as to be in close contact with each other.

According to the above-mentioned embodiment, if the connecting wire 5 having a length which does not cause slack passing through the packing 17 is connected to the coupler 6 and the notch 18 is axially passed, the coupler 6 is attached to the opening 4a. The cover 4 can be attached to the bracket 2 by connecting the connecting wire 5 to the coupler 6 in advance. Further, since the cutout portion 18 is airtightly closed by the projecting portion 17a of the packing 17, the entire structure can be easily sealed.

[Effect of device]

According to the present invention, in the rotation speed detection device having a closed structure, an opening for mounting a connection coupler for connecting a connection line drawn from the detector and an external connection line is provided on an outer peripheral portion of a U-shaped cross section surrounding the detector, A part of the opening is cut out with a width that allows the detector connecting wire to be inserted in the axial direction, and the notch is closed by a protrusion integrally formed with a packing inserted between the coupler and the opening. As a result, before connecting the cover, the detector connection wire is attached to the coupler with a length that does not cause slack to facilitate the connection work and to prevent damage to the connection wire due to contact with the rotating part. It is possible to obtain an effect that the notched portion of the portion can be closed by the projecting portion of the packing after passing the connecting wire to form a sealed structure.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a vertical sectional view of a conventional example. 2 ... Bracket, 3 ... Detector, 4 ... Cover, 4a ...
… Aperture, 5 …… Connecting wire, 6 …… Coupler, 17 …… Packing, 17a …… Projection, 18 …… Notch.

Claims (1)

[Scope of utility model registration request] 1. A rotation speed detector mounted on the outer surface of a bearing bracket is surrounded by a cover having a U-shaped cross section and attached to the bracket, and the detector is provided in an opening provided on the outer periphery of the cover. In a rotation speed detecting device in which a coupler for connecting a connection line drawn from the external connection line and an external connection line is attached through a packing, a bracket side of the opening is notched with an appropriate width and is inserted into the notch. A rotation speed detecting device, characterized in that a protrusion for closing this is integrally formed with the packing.