JPH05209606A - Fastener - Google Patents

Abstract

PURPOSE:To provide a fastener which can easily be assembled, does not generate slipping, and prevent fretting corrosion from occurrence. CONSTITUTION:An H-shaped fastening body 5 is fitted to key grooves 3, 4 of a shaft 1 and a boss 2, respectively. When fastening a set screw 15, tapered surfaces 7, 8 and 11, 12 of the H-shaped fastening body 5 is pressurized by trapezoidal members 9, 1. By the above-mentioned pressure, the H-shaped fastening body 5 is press-contacted to wall surfaces of the key grooves 3, 4 of the shaft 1 and the boss 2. Repulsion of pressurizing force of the set screw to the trapezoidal member 9 generates frictional force on a contact portion between the shaft 1 and the boss 2, and thereby fastening of the shaft 1 and the boss 2 is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener for fastening a shaft and a boss.

[0002]

2. Description of the Related Art As a fastener of this type, a fastener utilizing a key fastening structure and a set screw fastening is conventionally known.

[0003]

[Problems to be Solved by the Invention] According to the above configuration,
There was a defect that slip occurred between the shaft and the boss, and fine motion wear occurred between them. The present invention aims to eliminate the above defects.

[0004]

To achieve the above object, the present invention provides a fastener for fastening and fixing a shaft 1 having a key groove 3 and a boss 2 fitted to the shaft 1 and having a key groove 4 formed therein. And an H-shaped fastening body 5 in which recessed portions 6 and 10 which are arranged in the key grooves 3 and 4 and have a pair of inclined surfaces 7, 8, 11, and 12 are formed in the upper and lower portions, respectively, and the recessed portion. 6,
Trapezoidal members 9 and 13 fitted and arranged in each of 10;
And a set screw 15 screwed into a screw hole 14 communicating with the key groove 4 of the boss 2 formed in the boss 2.

[0005]

By tightening the set screw 15, the trapezoidal members 9 and 13 are slanted surfaces 7, 8 and 11, 1 of the H-shaped fastening body 5.
2, the H-shaped fastening body 5 is pressed against the wall surfaces of the key grooves 3 and 4 of the shaft 1 and the boss 2 by the reaction force. Further, the reaction force of the pressing force of the set screw 15 against the trapezoidal member 9 generates a frictional force at the contact portion between the shaft 1 and the boss 2 on the side opposite to the key groove 3 of the shaft 1 and the shaft 1 and the boss 2. Is concluded.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the embodiments shown in the accompanying drawings. 1 is an axis, 2 is a boss,
Key grooves 3 and 4 are formed in the axial direction, respectively. Reference numeral 5 is an H-shaped fastening body, which is fitted and arranged in the key grooves 3 and 4. A trapezoidal member 9 is fitted and arranged between the inclined surfaces 7 and 8 of the recessed portion 6 formed in the upper portion of the H-shaped fastening body 5. A trapezoidal member 13 is fitted and disposed between the inclined surfaces 11 and 12 of the recessed portion 10 formed in the lower portion of the fastening body 5.

The lower end 5a of the fastening body 5 is opposed to the bottom surface 3a of the key groove 3 with an appropriate gap. One surface of the trapezoidal member 13 abuts on the bottom surface of the key groove 3, and the other surface 13a of the trapezoidal member 13 faces the bottom surface of the recessed portion 10 with an appropriate gap. A plurality of screw holes 14 are formed in the tube wall of the boss 2, and each of the screw holes 14 communicates with the key groove 4.

A set screw 15 is screwed into each of the screw holes 14, and a tip of the set screw 15 faces one surface of the trapezoidal member 9. In the above configuration, when the set screw 15 is screwed into the screw hole 14 in the tightening direction, the pressing force of the set screw 15 causes trapezoidal members 9, 1
3 are press-fitted into the recessed portions 6 and 10, respectively.

The H-shaped fastening body 5 is brought into close contact with the wall surfaces of the key grooves 3 and 4 of the shaft 1 and the boss 2 by the reaction force of the pressure against the recessed portions 6 and 10 of the trapezoidal members 9 and 13. Also, set screw 15
The reaction force of the pressing force to the H-shaped fastening body 5 generates a frictional force at the contact portion between the shaft 1 and the boss 2 on the side opposite to the key groove 3 of the shaft 1, so that the shaft 1 and the boss 2 are strong. Will be concluded.

[0010]

[Effects] Since the present invention is constructed as described above, there are effects that the assembling work is simple, no slippage occurs, and fine movement wear can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view.

[Explanation of symbols]

 1 Axis 2 Boss 3 Key Groove 4 Key Groove 5 H-Shaped Body 6 Recessed Part 7 Inclined Surface 8 Inclined Surface 9 Trapezoidal Member 10 Recessed Area 11 Inclined Surface 12 Inclined Surface 13 Trapezoidal Member 14 Screw Hole 15 Set Screw

Claims (1)

[Claims] 1. A fastener for fastening and fixing a shaft 1 having a key groove 3 formed therein and a boss 2 fitted to the shaft 1 having a key groove 4 formed therein. H-shaped fastening body 5 in which recessed portions 6 and 10 having a pair of inclined surfaces 7, 8, 11, and 12 are formed in the lower and lower portions, and a trapezoidal member 9 fitted and arranged in each of the recessed portions 6 and 10. , 1
And a set screw 15 screwed into a screw hole 14 communicating with the key groove 4 of the boss 2 formed in the boss 2.