JPH04122818U - Anti-rotation mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rotation prevention mechanism that can prevent a screw pin and a sleeve from rotating without processing or using a special medium when assembling the screw pin, and prevents the screw pin from loosening. [Configuration] Sleeve 3 with female thread 2 along the radial direction
and a screw pin 4 having a head 6 having a smaller diameter than the female thread 2 on a male thread 5 having the same diameter as the female thread 2, and a shaft hole having a smaller diameter than the female thread 2 and a larger diameter than the head 6. It has an annular part 8 with a part 9 provided along the radial direction.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea can be used, for example, to fix the collar that holds the driven ring of a mechanical seal. This invention relates to a detent mechanism used for.

0002

[Conventional technology]

Generally, an annular fixed member is fixed to the sleeve (fixed member) so that it does not rotate. Mechanisms include spot welding, which joins parts by melting them together, and caulking, which swages parts together. This includes applying adhesive to parts, tightening with screws, etc.

0003

[Problem that the idea aims to solve]

However, although the above is reliably prevented from rotating, both parts are Because materials are directly melted and transformed, and special media such as adhesives are used, assembly is difficult. Not only is the disassembly work for installation and maintenance extremely troublesome, but it also There is a problem in that the parts after dismantling are forced to be disposed of, resulting in a heavy financial burden on the user. .

0004 Also, although it does not have the above problem, it may come loose if used in a place that is subject to vibration. However, there is a risk that the anti-rotation function may be impaired.

[0005] This idea was developed to solve the above problem, and it was designed to solve the above problem. It is possible to prevent rotation without melting or deforming the parts or using special media. Another object of the present invention is to provide a rotation prevention mechanism that prevents a screw member from loosening.

[0006]

[Means to solve the problem]

In order to achieve the above purpose, this idea is based on a cylindrical structure with a female thread along the radial direction. The fixing member and the male thread having the same diameter as the female thread have a head smaller in diameter than the female thread. a shaft hole with a smaller diameter than the female thread and a larger diameter than the head part is provided along the radial direction. and a girder annular member to be fixed.

[0007]

[Effect]

This idea based on the above configuration first connects the male thread of the threaded member to the female thread of the fixing member. While screwing in, tighten until the head is almost flush with the surface of the fixing member. So After attaching the fixed member to the fixed member and aligning the center of the shaft hole and the female thread, Loosen the screw member, move its head into the shaft hole, and insert the shaft into the fixed member to rotate. The locking is completed.

[0008] Here, rotation of the fixed member is prevented by the head of the screw member. The screw member The male thread of the fixing member comes into contact with the shaft to prevent the fixing member from moving inward, and the male thread of the The part comes into contact with the fixed member to prevent the fixed member from moving outward, that is, from loosening. It will be done.

[0009]

【Example】

Next, this idea will be explained based on FIG. 1. In Figure 1(A), 1 is the axis. The shaft 1 has a cylindrical fixing member provided with a female thread 2 along the radial direction. 3 is attached (fitted). 4 is a male thread 5 having the same diameter as the female thread 2, and a female thread 2. This is a screw pin as a screw member having a head 6 having a smaller diameter than that of the screw pin. This male screw 5 The axial length of the sleeve 3 is set to be equal to or slightly shorter than the wall thickness t of the sleeve 3. Also, head 6 A slot 7 is provided on the end face of. 8 is a ring-shaped part as a member to be fixed; The axial dimension of this component 8 is longer than the diameter of the female thread 2. In addition, part 8 also has the above-mentioned lens. A shaft hole 9 having a smaller diameter than the same 2 and a larger diameter than the head 6 is formed through the shaft hole 9 along the radial direction. Ru.

0010 The procedure for fixing the above-mentioned component 8 to the sleeve 3 so as to prevent it from rotating will be explained. First, (B) Screw the screw pin 4 into the female thread 2 of the sleeve 8 and tighten it as shown in (C). Tighten until the end surface of the head 6 is almost flush with the outer surface of the sleeve 3 or slightly lower. wear. Next, move the component 8 toward the sleeve 8 side, and move the shaft hole 9 as shown by the two-dot chain line. It stops when the centers of the set screws 2 are aligned.

[0011] Then, insert the screw pin 4 so that the tip of the male thread 5 is inserted into the inner peripheral surface of the sleeve 3. Move the head 6 into the shaft hole 9 by loosening it until it is in the position shown in (A). Then, the shaft 1 is inserted into the sleeve 8, and the assembly work is completed.

0012 On the other hand, if the above operation is performed in reverse, the sleeve 3, screw pin 4, and parts 8 can be disassembled. I can do that.

[0013] As described above, the head 6 is positioned in the shaft hole 9 of the component 8 attached to the sleeve 3. Because of this, when the forming surface of the shaft hole 9 comes into contact with the head 6, the part 8 and the sleeve 3 are separated. relative rotation is reliably prevented. Further, the tip of the male threaded portion 5 of the screw pin 4 is By coming into contact with shaft 1, movement in the tightening direction is prevented, and the male thread The end surface of the head 6 side of the part 5 comes into contact with the inner circumferential surface of the part 8, so that the movement in the loosening direction is completed. Prevented.

[0014] In addition, the present invention can be assembled by simply tightening and loosening the pre-processed screw pin 4. Installation, disassembly, and maintenance work can be performed, and unlike conventional There is no need to deform or process the fixing member or the fixed member, and there is no need to use special adhesives such as adhesives. No media is used. Therefore, assembly and disassembly work can be done easily. Also, after maintenance, the sleeve 3, screw pin 4, and parts 8 can be reused any number of times. It is economical. In addition, as a specific example of the component 8 of the present invention, for example, in a mechanical seal, Examples include a collar that indirectly holds a driven ring attached to a shaft.

[0015]

[Effect of the idea]

Since this invention is constructed as described above, the formation of the shaft hole of the fixed member is When the surface comes into contact with the head of the screw member, the fixed member is reliably prevented from rotating, and the The same parts will not come loose.

[0016] In addition, there is no need to deform or process the fixing member or fixed member during assembly. No special media such as adhesives are used. Therefore, assembly and disassembly work is easy. In addition to being able to reuse the fixed member and fixed member any number of times, , economical.

[Brief explanation of drawings]

FIG. 1 (A) is a vertical cross-sectional view showing an embodiment of the present invention;
(B) is a partial longitudinal sectional view of inserting the screw pin into the sleeve;
(C) is a partial longitudinal cross-sectional view of mounting parts on the sleeve.

[Explanation of symbols]

2 Female thread 3 Sleeve (fixing member) 4 Screw pin (screw member) 5 Male thread 6 Head 8 Parts (members to be fixed) 9 Shaft hole

Claims (1)

[Scope of utility model registration request] 1. A cylindrical fixing member having a female thread along the radial direction, a screw member having a male thread having the same diameter as the female thread and a head having a smaller diameter than the female thread, and the female thread. A rotation prevention mechanism comprising: an annular fixed member having a shaft hole along the radial direction that is smaller in diameter than the screw and larger in diameter than the head.