JPS6132173Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a reverse rotation prevention device attached to a rotating machine.

Conventionally known devices of this type are shown in FIGS. 1 and 2. FIG. 2 shows a section--line of FIG. In Figures 1 and 2, 1 is the outer frame of the vertical motor, 2 is the stator core,
It is incorporated into the outer frame 1. 3 is a rotor core, which is fixed to the shaft 4. 5 is the bracket, outer frame 1
is fixed. 6 is a bearing, which is assembled into the shaft 4 and the bracket 5. 7 is the ratchet hub,
It is fixed to the bracket 5 with a fastener 13. 8
is a cover fixed to the ratchet hub 7. A runner 9 is fixed to the shaft 4. 1
Reference numeral 0 denotes a ratchet pin, which is inserted into holes 9a of a runner 9, which is a ratchet pin holding member, at equal intervals on the circumference. Ratchets 7a are formed in one direction in the ratchet hub 7 at the same intervals as the holes 9a of the runner 9 in the circumferential direction. 20 is a lid that prevents the ratchet pin 10 from flying out upwards.

Next, the operation will be explained. When the shaft 4 rotates in the forward direction (in the direction of the arrow), the ratchet pin 10 moves upward along the slope of the ratchet hub 7.
When a certain rotational speed is reached, the centrifugal force causes the ratchet pin 10 to remain in contact with the side surface of the hole 9a of the runner 9, and there is no relative movement between the ratchet pin 10 and the runner 9, and the ratchet pin 10 moves inside the hole 9a of the runner 9 as shown in A. It is held in an upright position and rotates together with the runner 9. When trying to stop, if the rotational speed starts to drop, the ratchet pin 10 will move to the ratchet hub 7.
Rotates while in contact with the anti-reverse groove on the top surface.

If the shaft 4 attempts to rotate in the opposite direction, the ratchet pin 10 catches on the ratchet 7a of the ratchet hub 7, preventing the runner 9 from rotating in the opposite direction, and the rotation of the shaft 4 is stopped.

In the conventional reverse rotation prevention device, when a sudden reverse occurs, the ratchet pin 10 hits the ratchet 7a of the ratchet hub 7 due to impact force, so it was necessary to increase the strength of each part. Also, in order to reduce the impact force as much as possible,
It was necessary to increase the number of ratchet pins 10 and the number of ratchets 7a of the ratchet hub 7.

This invention was made with the aim of eliminating the above-mentioned drawbacks of the conventional technology, and provides a reversal prevention device that absorbs the impact when reversing by providing an elastic body in the ratchet pin hole of the runner. be.

An embodiment of this invention will be described below based on the drawings. In FIGS. 3 and 4, reference numeral 11 denotes a bush into which the ratchet pin 10 is inserted so that it can move forward and backward;
Reference numeral 12 denotes an elastic body, which is attached to the outer periphery of the bush 11. Note that the other configurations are the same as those of the conventional one, so the explanation will be omitted.

In this device, an elastic body 12 attached to the surface of the bush 11 is inserted and fixed into the ratchet pin hole 9a of the runner 9, so that the elastic body 12 absorbs all the shock during reverse rotation. This is what I did.

In this embodiment, the elastic body is attached to the outer surface of the bush, but the same effect can be achieved even if the elastic body is attached to the inner surface. The entire bush may be made of an elastic material.
Also, a steel ball or the like may be used instead of the ratchet pin. A spring or the like may be used as the elastic body to absorb the impact force of the bushing.

In the above embodiment, the ratchet hub 7 was on the stationary side and the runner 9 was on the rotating side, but this relationship may be reversed.

As described above, according to this invention, by equipping the bush inserted into the ratchet pin hole with an elastic body, the impact force when the shaft is reversed is absorbed, and the effect on each part of the device is reduced. can get.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a conventional reverse rotation prevention device for a rotating machine, FIG. 2 is a cross-sectional view taken along the cross-section line of FIG. 1, and FIG.
FIG. 4 is a perspective view showing a bushing according to an embodiment of the present invention. In the figure, 7 is a ratchet hub, 7a is a ratchet, 9 is a runner, 9a is a hole, 10 is a ratchet pin, 11 is a bush, and 12 is an elastic body.
In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A reversal prevention device in which a ratchet pin inserted into a hole in a ratchet pin holding member so as to be freely retractable is engaged with a ratchet in a ratchet hub to prevent reverse rotation of a rotating machine, A reversal prevention device for a rotating machine, characterized in that a bush is attached to the hole of the ratchet pin holding member through an elastic body, and the ratchet pin is inserted into the bush so as to be freely forward and backward. (2) The reversal prevention device for a rotating machine according to claim 1, wherein the ratchet pin holding member is installed on the rotating part, and the ratchet hub is installed on the stationary part.