JP2006037996A - Shaft and rotor fastening structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft and rotor fastening structure for allowing fastening and unfastening with the turning operation only of a nut while eliminating the need for a special unfastening tool. <P>SOLUTION: The fastening structure for a shaft 1 and a gear (a rotor) 2 is provided for fastening a shaft 1 having a taper portion 1a and a male screw portion 1b at the shaft end and a gear (a rotor) 2 having a taper hole 2a whose taper angle is the same as that of the taper portion 1a of the shaft 1 to each other with a nut fastened to the male screw portion 1b of the shaft 1. The used nut is a collared nut 3 having a collar 3b on the side of a seat face 3a. The gear (the rotor) 2 has a cylindrical recessed portion 2b in the end face on the small diameter side of the taper hole 2a. The seat face 3a of the collared nut 3 abuts on a bottom face 2d of the cylindrical recessed portion 2b of the gear (the rotor) 2, and the collar 3b of the collared nut 3 is opposed to one side face of a retaining ring 4 mounted in the cylindrical recessed portion 2b. The shaft 1 and the gear (the rotor) 2 are fastened to each other with the collared nut 3 fastened to the male screw portion 1b of the shaft 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a shaft for fastening a shaft having a taper portion and a male screw portion at a shaft end portion and a rotating body having a taper hole having the same taper angle as the shaft taper portion by tightening a nut to the male screw portion of the shaft; The present invention relates to a fastening structure for a rotating body.

Conventionally, as a fastening structure of a shaft and a rotating body, a shaft having a taper portion and a male screw portion at the shaft end portion and a gear having a taper hole having the same taper angle as that of the shaft taper portion (rotating body) There are some which are fastened by tightening nuts (for example, see Patent Document 1).
JP-A-5-164134

  By the way, in the fastening structure of the shaft and gear (rotating body) disclosed in the above-mentioned JP-A-5-164134, the taper hole of the gear (rotating body) and the taper of the shaft are fastened by tightening a nut to the male thread portion of the shaft. It is fastened by the wedge action with the part, but when releasing the fastening, there is no mechanism for pulling out the gear (rotating body) from the shaft even if the nut is loosened, so the taper hole of the gear (rotating body) and the taper part of the shaft The space is locked, and it is difficult to pull out the gear (rotary body) from the shaft. Therefore, there is a problem that a dedicated tool for pulling out the gear (rotary body) from the shaft is required when releasing the fastening.

  Therefore, an object of the present invention is to provide a fastening structure of a shaft and a rotating body that does not require a dedicated tool for fastening release and can be fastened and released only by a nut turning operation.

  In order to solve the above problem, the invention according to claim 1 is characterized in that a rotating body having a shaft having a taper portion and a male screw portion at a shaft end portion and a taper hole having the same taper angle as the taper portion of the shaft is provided. In the fastening structure of the shaft and the rotating body that is fastened by tightening the nut to the male thread portion of the shaft, a nut with a flange having a collar on the seat surface side is used as the nut, and the rotating body has a small diameter of the tapered hole. The end face on the side has a cylindrical recess, the seat surface of the collared nut abuts against the bottom surface of the cylindrical recess of the rotating body, and the collar of the collared nut is mounted in the cylindrical recess The shaft and the rotating body are fastened by facing the one side surface of the retaining ring and tightening the nut with a flange on the male thread portion of the shaft.

  According to the first aspect of the present invention, a nut with a flange having a flange on the seat surface side is used as the nut, and the rotating body has a cylindrical recess on the end surface on the small diameter side of the tapered hole. The surface abuts against the bottom surface of the cylindrical recess of the rotating body, the collar of the nut with the collar faces one side of the retaining ring mounted in the cylindrical recess, and the nut with the collar is tightened on the male thread of the shaft. Since the shaft and the rotating body are fastened, it is possible to fasten and fasten only by rotating the nut with a collar, and there is an effect that a dedicated tool for fastening is unnecessary. Moreover, since the nut with a collar is prevented from coming off from the rotating body by a retaining ring after the fastening is released, there is an effect that the nut with a collar does not dissipate.

  A shaft and a gear that are fastened by tightening a nut (a rotating body) having a taper angle and a taper hole having the same taper angle as that of the shaft having a taper portion and a male screw portion at the shaft end portion. In the (rotating body) fastening structure, a nut with a flange having a flange on the seating surface side is used as the nut, and the gear (rotating body) has a cylindrical recess on the end surface on the small diameter side of the tapered hole. The bearing surface of the abutment comes into contact with the bottom surface of the cylindrical recess of the gear (rotary body), the collar of the nut with a collar faces one side of the retaining ring mounted in the cylindrical recess, and the collar is attached to the threaded part of the shaft. A shaft and a gear (rotary body) are fastened by tightening a nut. Examples thereof will be described below.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a fastening structure according to an embodiment of the present invention. FIG. 2 is a side view on the opposite side of the seating surface of the flanged nut used in the fastening structure shown in FIG. FIG. 3 is a side view of the bearing surface side of the nut with a flange used in the fastening structure shown in FIG.

  As shown in FIG. 1, the fastening structure of the Example of this invention fastens the gearwheel (rotating body) 2 to the axial end part of the axis | shaft 1 using the nut 3 with a collar mentioned later.

  The shaft 1 has a tapered portion 1a and a male screw portion 1b at the shaft end. A gear (rotating body) 2 fastened to the shaft end of the shaft 1 has a tapered hole 2a having the same taper angle as that of the tapered portion 1a of the shaft 1 as a central hole, and is cylindrical on the end surface on the small diameter side of the tapered hole 2a. A retaining ring groove 2c for mounting a retaining ring 4 to be described later is formed in the cylindrical recessed part 2b.

  As shown in FIGS. 2 and 3, the flanged nut 3 used for fastening has a collar 3b on the seating surface 3a side, and six tool engaging surfaces 3c on the outer peripheral surface opposite to the seating surface 3a. Forming. The six tool engaging surfaces 3c constitute a tool engaging portion with which a general-purpose spanner engages. Note that the number of the tool engagement surfaces 3c is not limited to six, and an even number such as four or eight may be formed. In addition, a female screw portion 3d that is screwed into the male screw portion 1b of the shaft 1 is formed at the center of the nut 3 with the collar.

  Next, fastening of the shaft 1 and the gear (rotating body) 2 will be described. First, the tapered hole 2 a of the gear (rotating body) 2 is inserted into the tapered portion 1 a of the shaft 1. In this state, the female thread portion 3d of the flanged nut 3 is screwed into the male threaded portion 1b of the shaft 1 until the seating surface 3a of the flanged nut 3 comes into contact with the bottom surface 2d of the cylindrical recess 2b of the gear (rotating body) 2. . Subsequently, the retaining ring 4 is attached to the retaining ring groove 2c in the cylindrical recess 2b. The retaining ring 4 has a notch at one location, and the outer diameter is elastically reduced when mounted. By attaching the retaining ring 4, one side surface of the retaining ring 4 and the collar 3b of the nut 3 with the collar are opposed to each other. Next, when the collar nut 3 is tightened with a general-purpose spanner (tool), the seat surface 3a of the collar nut 3 presses the bottom surface 2d of the cylindrical recess 2b of the gear (rotating body) 2 in the axial direction, and the gear (rotation) The tapered hole 2a of the body 2 is pushed into the tapered portion 1a of the shaft 1, and the gear (rotary body) 2 is fastened to the shaft 1 by the frictional force between the tapered portion 1a and the tapered hole 2a.

  Next, release of the fastening between the shaft 1 and the gear (rotating body) 2 will be described. First, when the flanged nut 3 in a tightened state is loosened by reverse rotation with a general-purpose wrench (tool), the flanged nut 3 moves in the axial direction and the collar 3b of the flanged nut 3 is one of the retaining rings 4. Abuts the side. Furthermore, when the nut 3 with a collar is loosened by reverse rotation, the collar 3b of the nut 3 with a collar presses one side surface of the retaining ring 4, and the gear (rotary body) 2 moves in the axial direction via the retaining ring 4. To do. As a result, the frictional force between the tapered portion 1a of the shaft 1 and the tapered hole 2a of the gear (rotating body) 2 is eliminated, and the fastening of the shaft 1 and the gear (rotating body) 2 is released.

  According to the above embodiment, the nut 3 having the flange 3b on the seat surface 3a side is used as the nut, and the gear (rotary body) 2 has the cylindrical recess 2b on the end surface on the small diameter side of the tapered hole 2a. The bearing surface 3a of the nut 3 with a collar comes into contact with the bottom surface 2d of the cylindrical recess 2b of the gear (rotating body) 2, and the collar 3b of the nut 3 with the collar is one of the retaining rings 4 mounted in the cylindrical recess 2b. Since the shaft 1 and the gear (rotary body) 2 are fastened by tightening the flanged nut 3 to the male thread 1b of the shaft 1 so as to face the side surface, It is possible to release the fastening, and there is an effect that a dedicated tool for releasing the fastening becomes unnecessary. In addition, since the nut 3 with the collar is prevented from coming off from the gear (rotary body) 2 by the retaining ring 4 after the fastening is released, there is an effect that the nut 3 with the collar is not dissipated.

  In the above embodiment, the example of the gear 2 is shown as the rotating body. However, in the invention according to claim 1, the rotating body is not limited to the gear, and the rotating body such as a sprocket, a pulley, or a cam is used. Is also applicable.

It is sectional drawing of the fastening structure of the Example of this invention. It is a side view on the opposite side to the bearing surface of the nut with a collar used for the fastening structure shown in FIG. It is a side view by the side of the bearing surface of the nut with a collar used for the fastening structure shown in FIG.

Explanation of symbols

1 Shaft 1a Taper 1b Male thread 2 Gear (Rotating body)
2a Tapered hole 2b Cylindrical recess 2c Retaining ring groove 2d Cylindrical recess bottom surface 3 Collar nut 3a Seat surface 3b Collar 3c Tool engagement surface 3d Female thread 4 Retaining ring

Claims (1)

A shaft that has a taper portion and a male screw portion at a shaft end portion, and a shaft that fastens a rotating body having a taper hole having the same taper angle as the taper portion of the shaft by tightening a nut to the male screw portion of the shaft; In the fastening structure of the rotating body,
A nut with a flange having a flange on the seating surface side is used as the nut, the rotating body has a cylindrical recess on an end surface on the small diameter side of the tapered hole, and the seating surface of the nut with the collar is the rotating body. Abutting against the bottom surface of the cylindrical recess, the collar of the flanged nut faces one side surface of a retaining ring mounted in the cylindrical recess, and tightens the flanged nut on the male thread portion of the shaft. The shaft and the rotating body are fastened by the shaft and the rotating body.

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