JPH07279981A - Bearing nut - Google Patents

Abstract

PURPOSE:To provide a bearing nut which can prevent from being loosened even though it is fitted on a rotary shaft which is frequently reversed in rotation. CONSTITUTION:A bearing nut is composed of a nut body 12 having a female thread part 13 adapted to be threadedly engaged with a thread part of a rotary shaft, and a tapered collar part 24, and the nut body being composed of a flange part 14 and a tapered part 19 which is formed at predetermined angular positions with a plurality of slit grooves 21 so that it can be radially decreased, and the tapered collar having a tapered hole which can be fitted onto the tapered part. Further, semicircular thread holes 28, 33 for a bolt are formed in the tapered part and the tapered part side one of opposite surfaces of the tapered collar, and a contractible thread part 27 composed of a semicircular hole having a stopper face for the bolt is formed in the opposed tapered collar side. A semicircular thread hole for a bolt is formed in the tapered collar side of a surface radially opposed to the contractible thread part, and a loosening thread part 32 formed of semicircular holes 29, 34 having stopper surfaces is formed in the tapered part side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing nut for fixing a rolling bearing to a rotary shaft.

[0002]

2. Description of the Related Art Conventionally, a bearing nut 1 of this type has, for example, an end portion of a rotary shaft 3 fitted to an inner ring 2a of a rolling bearing 2 fitted to a housing (not shown) as shown in FIG. The rolling bearing washer 5 is screwed into the threaded portion 4 screwed to the inner ring 2a so that the inner ring 2a is pressed, the outer ring 2b side is positioned on the housing side, and the locking claws of the rolling bearing washer 5 are locked. 5a
Was rotatably supported on the rotating shaft 3 by bending it into a nut turning groove portion 1a provided on the outer periphery of the bearing nut 1 and preventing it from rotating.

[0003]

However, in the rotary shaft 3 supported by the rolling bearing 2, particularly in the rotary shaft 3 having a high frequency of forward and reverse rotation, the bearing nut 1 is loosened, which causes the rotary shaft to rotate. 3 has a problem in that it causes vibrations and the like to generate noise, affects transmission side and output side failures, and significantly shortens the life of the rolling bearing.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide a bearing nut capable of preventing loosening even when it is attached to a rotating shaft having a high frequency of forward and reverse rotations. It is what

[0005]

In order to solve the above technical problems, the present invention provides a bearing nut for fixing a rolling bearing rotatably supporting a rotary shaft to the rotary shaft, wherein the bearing nut rotates about a center. A set of two members, a nut body having a female threaded portion to be screwed with the threaded portion of the shaft and a taper collar, is set and assembled, and the nut body has a flange portion that abuts the inner ring of the rolling bearing and a tapered portion that has a predetermined tapered surface on the outer periphery The taper portion is formed with a slit groove or a plurality of slit grooves at predetermined angular positions so that the female screw portion can be reduced in diameter, and the taper collar has a taper hole that can be externally fitted to the taper portion. , A semi-circular screw hole into which a bolt is screwed is provided on the taper part side of the facing surface at a plurality of equiangular positions where the taper part and the taper collar are fitted, and the taper parts facing each other are screwed. On the side, a semi-circular hole into which the bolt can be fitted and which has a stopper surface is bored to form a screw thread for tightening, and further, a taper collar of a diametrically opposed surface which is in phase with the screw thread for tightening. A semi-circular screw hole into which a bolt is screwed, and a semi-circular hole into which the bolt can be fitted and which has a stopper surface are bored to form a loosening screw portion. It is a bearing nut.

[0006]

With the above structure, the internal thread portion of the taper portion is reduced in diameter by the screwing of the bolt of the tightening screw portion by the movement of the taper collar, so that the threaded portion of the rotary shaft is bite-shaped. By fixing the rolling bearing and screwing the bolt onto the loosening screw portion, the taper collar is retracted and the female screw portion of the taper portion is elastically expanded to release the fixed state.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a bearing nut 11, and FIG. 2 is a right side view of FIG. Similarly to the above, the bearing nut 11 is screwed to, for example, a screw portion 4 screwed on the end of the rotating shaft 3, and the bearing nut 11 is
2, a taper collar 25, a plurality of tightening screw portions 27, and a loosening screw portion 32 constitute a set.

The nut body 12 is provided with a female screw portion 13 which is screwed into the screw portion 4 of the rotary shaft 3 at the center thereof, and a flange portion 14 and a taper portion 19 are integrally formed on the outer peripheral portion through a groove portion 18. The flange portion 14 is formed to have a predetermined diameter, and the rolling bearing 2 has a predetermined radius around the center of its side surface.
A pressing surface 15 for pressing the side surface of the inner ring 2a is formed, and an inclined surface 16 is formed on the outer periphery of the pressing surface 15.
Further, a groove 17 for turning the nut is formed at a position orthogonal to the outer circumference of the flange portion 14. A taper portion 19 is integrally formed on the flange portion 14 formed in this way through the groove portion 18, and the outer peripheral surface of the taper portion 19 has a predetermined diameter D of about 6 to 7 degrees (1/8). A tapered surface 20 having a taper is formed. In addition, slit grooves 21 are formed in the tapered portion 19 at equal angular intervals.
It is formed in a predetermined range in parallel to the axis at four places (illustrated at intervals of 120 degrees in this example). The slit groove 21 may be provided at one place depending on the purpose of use and accuracy.

The taper collar 25 has a taper portion 1
9 has a tapered hole 26 with a predetermined accuracy to be fitted on the tapered portion 19 in the inner diameter portion, and is formed in a ring shape having a predetermined width dimension. The taper collar 25 thus formed is externally fitted to the taper portion 19, and the fitting portion is provided with a tightening screw portion 27 and a loosening screw portion 32 as shown in FIG.

The tightening screw portion 27 has a taper portion 19
3 and the taper collar 25 are fitted with each other at equal angular intervals.
It is formed in parallel with the axis at four positions (illustrated at intervals of 120 degrees in this example). In this case, it is formed at the phase positions a, b, and c between the slit grooves 21 formed in the tapered portion 19. At each of the positions a, b, and c, a semicircular screw hole 28 into which a set bolt 31a having a predetermined diameter is screwed in a semicircular shape is formed on the taper portion 19 side of the facing surface thereof.
Of the semicircular screw hole 28 corresponding to the semicircular screw hole 28, and a semicircular semicircular hole 29 into which the set bolt 31a can be fitted is bored with a predetermined length l1. A stopper surface 30 is formed at the end of the semicircular hole 29.

Further, the loosening screw portion 32 is formed at diametrical positions d and e which are in phase with each other by approximately 30 degrees from the positions a and b of the tightening screw portion 27, and the positions d and e are opposed to each other. On the side of the tapered collar 25 of the surface, a semicircular screw hole 33 into which the set bolt 31b is screwed in a semicircular shape is screwed over the length of the tapered collar 25, and the tapered portion 19 corresponding to this semicircular screw hole 33. A semicircular hole 34 having a semicircular shape, into which the set bolt 31b can be fitted, is bored with a predetermined length l1.
A stopper surface 35 is formed at the end of the semicircular hole 34. With the taper portion 25 of the nut body 12 thus formed fitted with the taper collar 25, the set bolt 31a is fitted in the semicircular screw hole 28 of the tightening screw portion 27 at each position a, b, c. Screwed together, the same set bolt 31a
Has its tip abutted against the stopper surface 30, and the loosening screw portion 32 at the positions d and e also has a semicircular screw hole 33.
The set bolt 31b is screwed into the
The tip of b is brought into contact with the stopper surface 35 and assembled.

Bearing nut 1 set as described above
In order to fix the rolling bearing 2 to the rotating shaft 3 by 1, the female screw portion 13 of the nut body 12 is screwed onto the screw portion 4 of the rotating shaft 3 which is rotatably fitted and supported by the inner ring 2a of the bearing 2. ,
The pressing surface 15 of the flange portion 14 is formed on the inner ring 2a of the rolling bearing 2.
Abutting against the side surface of.

Thereafter, the set bolts 31a of the tightening screw portions 27 at the positions a, b and c are evenly rotated in the screwing direction. In this case, the tip of the set bolt 31a is in contact with the stopper surface 30 of the semicircular hole 29, whereby only the taper collar 25 is displaced along the taper surface 20, and the taper portion is displaced by the displacement of the taper collar 25. 19 is reduced in diameter in the radial direction through the slit groove 21, the female screw portion 13 is tightened to the screw portion 4 of the rotary shaft 3 in a binding manner, and the nut body 12 is locked to the female screw portion 13, whereby the rolling bearing 2 Is fixed to the rotating shaft 3.

When removing the bearing nut 11 during maintenance, the set bolt 31b of the loosening screw portion 32 at the positions d and e is evenly rotated in the screwing direction. The tip of the set bolt 31b is in contact with the stopper surface 35 of the semicircular hole 34, whereby only the taper collar 25 is displaced backward along the taper surface 20,
Due to the displacement of the taper collar 25, the taper portion 19 is elastically expanded to its original state through the slit groove 21, and the female screw portion 13 is released from the state in which it is tightened in the threaded portion 4 of the rotating shaft 3 in a tie state. , The nut body 12 has a female thread portion 13
Is returned to the normal screwed state, and the groove 17 of the flange portion 14 is
The fixed state of the rolling bearing 2 and the rotary shaft 3 is released by detaching the bearing nut 11 by turning the bearing nut 11 through.

Since this embodiment is constructed as described above, by rotating the set bolt 31a of the screw portion 27 for tightening, the taper collar 25 becomes the taper portion 19.
Is advanced along the tapered surface 20 of the
Since 0 is a taper 1/8, the set screw 31a of the tightening screw portion 27 is swung slightly, so that the female screw portion 13 is instantly contracted to the screw portion 4 of the rotary shaft 3 in a tie shape. It is possible to fix the rolling bearing 2 with a diameter so as to prevent it from loosening, sufficiently cope with the frequency of forward and reverse rotations of the rotating shaft 3, and significantly reduce the frequency of failure on the input side and the output side. Further, the durability of the rolling bearing can be maintained, and the reliability of the device can be improved.
When loosening the bearing nut 11, the loosening screw 3
It can be easily loosened by screwing the second bolt 31b.

In the above embodiment, the operation of the taper collar 25 is exemplified by the set bolts 31a, 31b, but the invention is not limited to this. For example, the cap bolt 36 may be used as shown in FIG. In this case, the stopper surface 37 is configured to be in sliding contact with the head portion 36a of the cap bolt 36 as shown in the figure.

[0017]

As described above, since the present invention is constructed as described above, the taper collar is advanced along the taper surface of the taper portion by rotating the bolt of the tightening screw portion. Since the taper surface is formed as a taper 1/8, the bolt of the tightening screw part is slightly rotated and the female screw part is immediately reduced to the threaded part of the rotary shaft in a conjugation manner with high accuracy. The rolling bearing can be fixed to prevent it from loosening, the frequency of forward and reverse rotation of the rotating shaft can be sufficiently dealt with, and the frequency of failures on the input side and the output side can be significantly reduced. The durability of the bearing can be maintained and the reliability of the device can be improved.
Further, when loosening the bearing nut, it can be easily loosened by screwing the bolt of the loosening screw portion.

[Brief description of drawings]

1 is a sectional view of the bearing nut taken along the line AA of FIG.

FIG. 2 is a right side view of FIG.

FIG. 3 is a cross-sectional view showing another aspect of bolts for a tightening screw part and a loosening screw part.

FIG. 4 is a sectional view of a conventional bearing nut.

[Explanation of symbols]

 2 rolling bearing 2a inner ring 3 rotary shaft 4 screw part 11 bearing nut 12 nut body 13 female screw part 14 flange part 15 pressing surface 19 taper part 20 taper surface 21 slit groove 25 taper collar 26 taper hole 27 tightening screw part 28, 33 Semicircular screw hole 29,34 Semicircular hole 32 Loosening screw portion 31a, 31b Set bolt (bolt) 36 Cap bolt (bolt) 30,35,37 Stopper surface

Claims (1)

[Claims] 1. A bearing nut for fixing a rolling bearing, which rotatably supports a rotating shaft, to the rotating shaft, the bearing nut having a female threaded portion which is screwed to a threaded portion of the rotating shaft, and a taper. The nut body is assembled by a collar and two members, and the nut body is formed of a flange portion that abuts the inner ring of the rolling bearing and a taper portion having a predetermined taper surface on the outer periphery, and a single or a plurality of slit grooves are formed in the taper portion. It is formed at a predetermined angle position so that the female screw part can be reduced in diameter, and the taper collar has a taper hole that can be externally fitted to the taper part. A semicircular screw hole into which a bolt is screwed is provided on the taper portion side of the facing surface at the position, and the bolt can be fitted on the facing taper collar side and has a stopper surface. A circular hole is drilled to form a screw thread for tightening, and a semicircular screw hole for screwing a bolt is screwed on the taper collar side of the diametrically opposed surface that is in phase with the screw thread for tightening. Then, a bearing nut configured to form a loosening screw portion by forming a semicircular hole having a stopper surface into which the bolt can be fitted on the taper portion side.