KR20150032727A - Screw loosening prevention structure - Google Patents

Screw loosening prevention structure Download PDF

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Publication number
KR20150032727A
KR20150032727A KR20157002032A KR20157002032A KR20150032727A KR 20150032727 A KR20150032727 A KR 20150032727A KR 20157002032 A KR20157002032 A KR 20157002032A KR 20157002032 A KR20157002032 A KR 20157002032A KR 20150032727 A KR20150032727 A KR 20150032727A
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KR
South Korea
Prior art keywords
hole
pin
jig
screw
bolt
Prior art date
Application number
KR20157002032A
Other languages
Korean (ko)
Inventor
노리오 유자와
Original Assignee
카야바 고교 가부시기가이샤
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Publication of KR20150032727A publication Critical patent/KR20150032727A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3228—Constructional features of connections between pistons and piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/32—Locking by means of a pawl or pawl-like tongue
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3235—Constructional features of cylinders
    • F16F9/3242—Constructional features of cylinders of cylinder ends, e.g. caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/0041—Locking; Fixing in position

Abstract

The screw loosening preventing structure 15 for restricting the relative rotation of the cylinder head 5 (first member) and the cylinder tube 4 (second member), which are coupled by the screwing of the screws 11 and 12, A first hole 16 formed in the head 5, a second hole 17 formed in the cylinder tube 4, a pin 18 inserted in the second hole 17, (Spring 19) which is interposed between the cylinder head 5 and the cylinder tube 5 and presses the pin 18 in the direction of pushing the pin 18 from the second hole 17, 4 are inserted into the first hole 16 and the second hole 17 in a state in which they are fitted together.

Description

[0001] SCREW LOOSENING PREVENTION STRUCTURE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw loosening preventing structure for restricting relative rotation of two members coupled by screwing of a screw.

2. Description of the Related Art Conventionally, as a screw loosening preventing structure, for example, there has been used a set screw for preventing rotation of a member or forming a caulked portion by plastic deformation of a screw member.

In JP2008-121753A, it is disclosed that recesses and projections, which are coupled to each other between a screw and a washer, are formed to regulate the relative rotation of the screw and the washer.

However, in the screw loosening preventing structure disclosed in JP2008-121753A, there has been a problem that a large torque is applied in the direction of releasing the screw connection of the screw, or a screw is loosened when vibration or shock is applied.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screw loosening preventing structure in which a screw is reliably prevented from being loosened.

According to an aspect of the present invention, there is provided a screw loosening preventing structure for restricting relative rotation between a first member and a second member coupled by screwing of a screw, the first hole being formed in the first member, A pin inserted in the second hole, and a pressing member which is interposed in the second hole and presses the pin in a direction in which the pin is extruded from the second hole, When the first hole and the second hole are engaged with each other as the two members relatively rotate, the first hole and the second hole are inserted.

1 is a sectional view of a hydraulic cylinder provided with a screw loosening preventing structure according to a first embodiment of the present invention.
2 is an enlarged cross-sectional view of a part of the hydraulic cylinder.
3 is a cross-sectional view showing a state in which unlocking of the cylinder head is performed.
4 is a sectional view taken along the line AA in Fig.
5 is a sectional view of a screw loosening preventing structure according to a second embodiment of the present invention.
6 is a sectional view of a screw loosening preventing structure according to a third embodiment of the present invention.
7 is a cross-sectional view of a screw loosening preventing structure according to a fourth embodiment of the present invention.
8 is a sectional view of a screw loosening preventing structure according to a fifth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First Embodiment)

First, a hydraulic cylinder (fluid pressure cylinder) 1 shown in Fig. 1 will be described. This hydraulic cylinder 1 is provided with a screw loosening preventing structure according to an embodiment of the present invention to be described later.

The hydraulic cylinder 1 includes a cylindrical cylinder tube 4, a piston 6 slidably received inside the cylinder tube 4, a piston rod 7 connected to the piston 6, And a cylinder head (5) for slidably supporting the piston rod (7).

The inside of the cylinder tube 4 is partitioned into a head chamber 2 and a bottom chamber 3 by a piston 6. The head chamber 2 is formed on the head side where the piston rod 7 protrudes from the cylinder tube 4 and the cylinder tube 4 and the piston 6, the piston rod 7 and the cylinder head 5 . The bottom chamber 3 is formed on the bottom side of the cylinder tube 4 and is partitioned by the cylinder tube 4 and the piston 6.

(Working fluid) supplied from the pump side of the hydraulic pressure source flows into the bottom chamber 3 through the bottom side passage (not shown), so that the piston 6 is moved toward the head side (Upward in Fig. 1), and the operating oil of the head chamber 2 flows out to the tank side of the hydraulic pressure source through the head side passage (not shown).

On the other hand, at the time of contraction operation of the hydraulic cylinder 1, the hydraulic oil supplied from the pump side of the hydraulic pressure source flows into the head chamber 2, the piston 6 moves to the bottom side (downward in Fig. 1) The operating oil of the bottom chamber 3 flows out to the tank side of the hydraulic pressure source.

A load (not shown) is connected to the piston rod 7, and the cylinder tube 4 is connected to a fixed portion (not shown). As the hydraulic cylinder 1 is stretched and contracted, the load connected to the piston rod 7 is driven.

Hereinafter, a structure for coupling the cylinder head 5 to the cylinder tube 4 will be described.

The cylinder tube 4 and the cylinder head 5 are formed in a cylindrical shape. On the inner circumference of the cylinder tube (4), a female screw (12) is formed. On the outer periphery of the cylinder head 5, a male screw 11 is formed. The male screw 11 is screwed to the female screw 12, so that the cylinder head 5 is fastened to the cylinder tube 4. Sealing rings 13 and 14 are interposed between the cylinder tube 4 and the cylinder head 5. [ In the present embodiment, although the O-rings are employed as the seal rings 13 and 14, they are not limited to O-rings. In addition to this, a sealing member such as an X ring may be suitably employed.

The cylinder head 5 and the cylinder tube 4 are screwed together through the screws 11 and 12, respectively. Between the cylinder tube (4) and the cylinder head (5), a screw loosening preventing structure (15) for restricting the relative rotation of both is provided.

The screw loosening preventing structure 15 has a first hole 16 and a first through hole 21 formed in the cylinder head 5, a second hole 17 formed in the cylinder tube 4, A pin 18 inserted through the hole 16 and the second hole 17 and a pin 18 interposed between the second hole 17 and the pin 18 from the second hole 17 to the first hole 16 And a spring (19) for pressing in the direction of extrusion. The pin 18 is inserted through the first hole 16 and the second hole 17 by the urging force of the spring 19 so that the relative rotation of the cylinder tube 4 and the cylinder head 5 is regulated. In the present embodiment, a single screw loosening preventing structure 15 is provided, but the number is not limited to one. A plurality of screw loosening preventing structures 15 may be provided in order to obtain a predetermined screw loosening preventing performance including the present embodiment and other embodiments to be described later.

2, the cylindrical pin 18 has a cylindrical outer peripheral surface 18A extending in the central axis direction, and inclined end portions 18B, 18B formed in a tapered shape (truncated cone shape) at both ends thereof, 18C, and end surfaces 18D, 18E formed at both ends thereof in a planar shape orthogonal to the central axis.

The end portion of the pin 18 is not limited to the configuration that forms the inclined end portions 18B and 18C and the end surfaces 18D and 18E and may be formed in a spherical shape, for example.

The first hole 16 and the second hole 17 are formed such that their inner diameters are larger than the outer diameters of the fins 18 by a predetermined gap. Thereby, the pin 18 is slidably inserted through the first hole 16 and the second hole 17. [

The spring 19 is made of a coil spring and is compressed and interposed between the bottom 17C of the second hole 17 and the end surface 18E of the pin 18. The spring 19 is a pressing member that presses the pin 18 in the direction of pushing out the second hole 17.

Further, the pressing member is not limited to the above-described configuration, and a metal spring having a different shape may be used, or an elastic material such as rubber may be used.

The first hole 16 has an inner peripheral surface 16A having a cylindrical surface shape, an opening end portion 16B opened to the joint end surface 5A of the cylinder head 5, Section 16C.

The second hole 17 has an inner peripheral surface 17A in the form of a cylindrical surface, an opening end 17B opened to the joint end surface 4A of the cylinder tube 4, And a portion 17C.

The first hole 16 and the second hole 17 are formed such that the respective center lines extend in parallel with the center line O of the hydraulic cylinder 1 and the distances from the center line O are equal to each other. The first hole 16 and the second hole 17 coincide and extend coaxially with each other while the cylinder head 5 is fastened to the cylinder tube 4 with a predetermined tightening torque, And the opening end of the second hole (17) are aligned without a step.

The first through hole (21) extends coaxially with the first hole (16) and is formed to penetrate the cylinder head (5). The first through hole 21 has a female screw 22 formed on its inner periphery, an opening end 21A opened to the bottom portion 16C of the first hole 16, And an opening end 21B that opens to the opening 5B.

Fig. 3 is a sectional view showing a state in which the cylinder head 5 is installed in the cylinder tube 4. Fig. At the time of installation, a screw-shaped jig 25 inserted through the first through hole 21 is used. The jig 25 includes a threaded portion 25A formed on the outer periphery thereof with a male thread 26 and a head portion 25B formed on the base end of the threaded portion 25A and a threaded portion 25A formed in a planar shape orthogonal to the central axis (Not shown). 3, the jig 25 is inserted into the first through hole 21 so that the tip end 25C of the jig 25 is fitted to the opening end 16B of the first hole 16 in a state where the jig 25 is inserted into the cylinder head 5 And closes the opening end 16B. In the present embodiment, the screw 25A is formed in the jig 25. However, the present invention is not limited to this, and the screw 25A may not be formed. In other words, the jig 25 may have a bar-like shape which can slide in the axial direction of the first through-hole 21.

The step of installing the cylinder head 5 on the cylinder tube 4 is performed by the following steps.

[Jig mounting process]

The jig 25 is formed such that the male screw 26 of the screw portion 25A is screwed to the female screw 22 of the first through hole 21 and the head portion 25B of the jig 25 is engaged with the outer end face 5B In the cylinder head 5, as shown in Fig. The threaded portion 25A of the jig 25 is inserted into the first hole 16 and the tip end 25C of the threaded portion 25A is positioned in the vicinity of the opening end portion 16B of the first hole 16 Thereby closing the opening end 16B.

[Member fastening step]

The spring 19 and the pin 18 are inserted into the second hole 17 of the cylinder tube 4 and then the male screw 11 of the cylinder head 5 is screwed into the female screw 12 of the cylinder tube 4. Then, And the cylinder head 5 is fastened to the cylinder tube 4 in combination. The first hole 16 and the second hole 17 coincide each time the cylinder head 5 makes one rotation in the process of twisting the cylinder head 5 into the cylinder tube 4. However, The entrance of the pin 18 into the first hole 16 is restricted because the tip 25C blocks the opening end 16B of the first hole 16. [

The above operation will be described in detail. The pin 18 is pushed out of the second hole 17 by the urging force of the spring 19 and the slant end portion 18B is brought into sliding contact with the opening end 16B of the first hole 16, ). The end surface 18D is brought into contact with the tip end 25C of the jig 25 so that the pin 18 is restricted from further entering the first hole 16 (see Fig. 3). The inclined end 18B is brought into sliding contact with the opening end 16B of the first hole 16 by the torque that tilts the cylinder head 5 so that the tip end of the pin 18 that has entered the first hole 16 Out of the first hole 16, and the operation of twisting the cylinder head 5 continues. In this way, the screw loosening preventing structure 15 functions as a detent mechanism for stopping the rotation of the cylinder head 5 every time the cylinder head 5 makes one revolution.

[Release prevention process]

The jig 25 is inserted into the first hole 16 after the cylinder head 5 is twisted to a position where the joining end face 5A contacts the joining end face 4A of the cylinder tube 4 with a predetermined surface pressure, . Subsequently, the cylinder head 5 is twisted with a predetermined tightening torque, and the first hole 16 and the second hole 17 are engaged with each other while the cylinder head 5 is rotated once with respect to the cylinder tube 4 . The pin 18 that is extruded from the second hole 17 by the urging force of the spring 19 moves from the second hole 17 to the second hole 17 in accordance with the fitting of the first hole 16 and the second hole 17, 1 hole 16 in the longitudinal direction. The pin 18 is arranged such that the center portion thereof is opposed to the joining end faces 5A and 4A of the cylinder head 5 and the cylinder tube 4 with respect to the central axial direction thereof (see Fig. 2).

As described above, when the cylinder head 5 is fastened to the cylinder tube 4 by screwing the male screw 11 and the female screw 12, the first hole 16 and the second hole 17 are fitted to each other The pin 18 that is extruded from the second hole 17 by the urging force of the spring 19 is inserted over the second hole 17 and the first hole 16. [ The relative rotation of the cylinder head 5 and the cylinder tubes 4 is restricted by the fins 18 and the process of installing the cylinder head 5 on the cylinder tube 4 is completed.

The [loosening preventing step] is not limited to the above-described configuration, and may be as follows.

The cylinder head 5 is first twisted with a predetermined tightening torque and the inclined end portion 18B of the pin 18 is brought into sliding contact with the opening end portion 16B of the first hole 16, And the second hole 17 (see Fig. 3).

Thus, the jig 25 is extracted from the first hole 16 in a state in which the first hole 16 and the second hole 17 are joined. The pin 18 is pushed out of the second hole 17 following the jig 25 by the urging force of the spring 19 as the jig 25 is ejected from the first hole 16, Is inserted over the hole 17 and the first hole 16 (see Fig. 2).

In this case, the operation of twisting the cylinder head 5 at the position where the first hole 16 and the second hole 17 finally match is ended. As the jig 25 is ejected from the first hole 16, the pin 18 is inserted over the second hole 17 and the first hole 16 and the cylinder head 5 is inserted into the cylinder The process of installing the tube 4 is completed.

As described above, the screw loosening preventing structure (the first member) and the cylinder tube 4 (the second member) which restrict the relative rotation of the cylinder head 5 (the first member) and the cylinder tube 4 15 includes a first hole 16 formed in the cylinder head 5, a second hole 17 formed in the cylinder tube 4, a pin 18 inserted in the second hole 17, And a pressing member (spring 19) which is interposed in the second hole 17 and presses the pin 18 in the direction of pushing out the second hole 17 from the second hole 17, And the cylinder tube (4) are inserted into the first hole (16) and the second hole (17).

When the torque to urge the cylinder head 5 and the cylinder tubes 4 to rotate relative to each other is applied during the operation of the hydraulic cylinder 1, the outer peripheral surface 18A of the pin 18 coaxially extends The inner peripheral surface 16A of the first hole 16 and the inner peripheral surface 17A of the second hole 17 are brought into contact with each other and a reaction force of a component orthogonal to the central axis acts on the pin 18. Thus, as long as the fins 18 are not broken, relative rotation of the both is restrained, whereby the loosening of the screws 11, 12 can be reliably prevented.

Even when the hydraulic cylinder 1 is subjected to vibration or impact, the pin 18 is retained at the position inserted through the second hole 17 and the first hole 16 by the urging force of the spring 19, The thread is prevented from being loosened.

A first through hole 21 communicating with the first hole 16 is formed in the cylinder head 5 in the screw loosening preventing structure 15 and the first through hole 21 is inserted through from the outside A jig 25 inserted into the first hole 16 is used. When the cylinder head 5 (first member) is twisted, a jig is inserted from the outside through the first through hole 21 into the first hole 16. The jig 25 covers the opening end 16B of the first hole 16 at the tip end 25C and the pin 18 extruded from the second hole 17 by the urging force of the urging member The first hole 16 and the second hole 16, respectively.

The jig 25 is inserted into the first hole 16 by screwing the jig 25 into the first through hole 21 and the pin 18 is inserted into the first hole 16, And is extruded from the first hole 16 against the urging force of the spring 19 (see Fig. 3). In this way, the pin 18 is drawn out from the first hole 16, so that the cylinder head 5 and the cylinder tube 4 can rotate relative to each other, and the engagement of the both can be released. Therefore, it is possible to repeatedly attach and detach the cylinder head 5 with respect to the cylinder tube 4.

The structure for coupling the cylinder head 5 to the cylinder tube 4 in the hydraulic cylinder 1 has been described above. Next, a structure for coupling the piston 6 to the piston rod 7 will be described.

As shown in Fig. 1, a nut 31 for fastening the piston 6 is provided at the tip end of the piston rod 7. As shown in Fig. The piston 6 and the nut 31 are formed into a cylindrical shape. The piston (6) is fitted to the tip end shaft portion (7A) of the piston rod (7). On the outer periphery of the tip end shaft portion 7A of the piston rod 7, a male screw 32 is formed. A female screw (33) is formed on the inner circumference of the nut (31). The male screw 32 is screwed to the female screw 33 so that the piston 6 is fastened to the piston rod 7 through the nut 31. [

And the piston rod 7 and the nut 31 are screwed through the screws 32 and 33, respectively. Between the piston rod (7) and the nut (31), a screw loosening preventing structure (35) for restricting the relative rotation of the piston rod (7) and the nut (31) is provided.

4, the screw loosening preventing structure 35 includes a first hole 36 and a first through hole 41 formed in the nut 31 and a second hole 34 formed in the piston rod 7, A pin 38 inserted through the first hole 36 and the second hole 37 and a pin 38 interposed between the second hole 37 and the pin 38 from the second hole 37 And a spring (39) for urging the first hole (36) in a direction of pushing out. The pin 38 is inserted through the second hole 37 and the first hole 36 by the urging force of the spring 39 so that the relative rotation of the piston rod 7 and the nut 31 is restricted.

The first hole 36 and the second hole 37 are formed such that the respective center lines extend in the direction orthogonal to the center line O of the hydraulic cylinder 1 and the nut 31 is fastened to the piston rod 7 And coaxially extend with respect to each other. Although the center line of the first hole 36 and the center of the second hole 37 intersect the center line O of the hydraulic cylinder 1 in this embodiment, the present invention is not limited to this configuration. The center line of the first hole 36 and the second hole 37 may be arranged so as not to intersect the center line O of the hydraulic cylinder 1. [

The first through hole 41 extends coaxially with the first hole 36 and is formed to penetrate the nut 31. The first through hole 41 is formed with a female screw 42 to which a jig (not shown) is screwed.

The step of mounting the piston 6 to the piston rod 7 through the nut 31 is performed by the following steps.

[Member fastening step]

After the spring 39 and the pin 38 are inserted into the second hole 37 of the piston rod 7 and the male screw 33 of the nut 31 is screwed into the female screw 32 of the piston rod 7 And the nut 31 is fastened to the piston rod 7. Since the first hole 36 and the second hole 37 are not engaged with each other in the process of screwing the nut 31 into the piston rod 7, It is not necessary to install a jig.

[Release prevention process]

The nut 31 is twisted with a predetermined tightening torque and the tip end of the pin 38 is brought into sliding contact with the opening end of the first hole 36 to fit the first hole 36 and the second hole 37 . The pin 38 is pushed out of the second hole 37 by the urging force of the spring 39 and the second hole 37 is pushed by the urging force of the spring 39 as the first hole 36 and the second hole 37 coincide with each other, 37) through the first hole (36). And the middle of the pin 38 is disposed in the fitting portion of the nut 31 and the piston rod 7. [

As described above, in the screw loosening preventing structure 35, the first hole 36 is opened to the inner periphery of the nut 31 (first member), and the second hole 37 is opened to the piston rod 7 And the first hole 36 is aligned with the second hole 37 as the nut 31 is twisted into the piston rod 7. [ This makes it unnecessary to provide a jig in the first through hole 41 of the nut 31 when the nut 31 is twisted to the piston rod 7, The relative rotation of the pistons 6 to the piston rods 7 is regulated so that the process of installing the pistons 6 on the piston rods 7 is completed.

The outer peripheral surface of the pin 38 extends coaxially with the pin 38 when the torque to urge the nut 31 and the piston rod 7 to rotate relative to each other is applied during the operation of the hydraulic cylinder 1 The pin 38 comes into contact with the inner circumferential surface of the first hole 36 and the inner circumferential surface of the second hole 37 and a reaction force of a component orthogonal to the central axis thereof acts. As long as the pin 38 is not broken, relative rotation of the both is restrained, whereby the loosening of the screws 33 and 32 can be reliably prevented.

Even when the hydraulic cylinder 1 is subjected to vibration or impact, the pin 38 is retained at the position inserted through the second hole 37 and the first hole 36 by the urging force of the spring 39, The screws 33 and 32 are prevented from loosening.

The screw loosening preventing structure 35 has a first through hole 41 through which a jig inserted from the outside into the first hole 36 is inserted. The first through hole 41 is formed in the nut 31 in communication with the first hole 36. In order to release the fastening of the nut 31 and the piston rod 7, a screw-shaped jig (not shown) is screwed into the first through hole 41 and inserted into the first hole 36, 38 from the first hole 36 against the urging force of the spring 39.

In this way, the pin 38 is drawn out from the first hole 36, so that the nut 31 and the piston rod 7 can rotate relative to each other, so that the fastening of both can be released. Therefore, it is possible to repeatedly perform attachment and detachment of the nut 31 to the piston rod 7. The jig has a length which is located near the opening end of the first hole 36 and closes the opening end when the jig is inserted through the first through hole 41 and provided on the nut 31. In this embodiment, the threaded portion is formed on the jig. The present invention is not limited to this, and it may be a rod-shaped member which can slide in the axial direction of the first through hole 41. [ The first through hole 41 may not be formed when it is not necessary to release the fastening of the nut 31 and the piston rod 7.

As described above, in the first embodiment, as shown in Figs. 1 to 4, the first and second members (the cylinder head 5 and the cylinder tube 4), which are threaded through the screws 11 and 12, The nut 38 is inserted into the pin 38 through the first and second members (the nut 31 and the piston rod 7) The screw loosening preventing structure 35 is inserted.

In the present embodiment, when the first member (the cylinder head 5, the nut 31) and the second member (the cylinder tube 4 and the piston rod 7) are fastened by screwing the screws, The pins 18 and 38 that are extruded from the second holes 17 and 37 by the urging force of the springs 19 and 39 in the state in which the first and second holes 16 and 36 and the second holes 17 and 37 are aligned, (17, 37) and the first holes (16, 36). The relative rotation of the first member (the cylinder head 5, the nut 31) and the second member (the cylinder tube 4 and the piston rod 7) is restricted by the pins 18 and 38. [

When a torque to relatively rotate the first member (the cylinder head 5, the nut 31) and the second member (the cylinder tube 4 and the piston rod 7) is applied, the pins 18 and 38 Is in contact with the inner circumferential surface of the first hole 16, 36 coaxially extending with the pin 18, 38 and the inner circumferential surface of the second hole 17, 37, respectively. As long as the fins 18 and 38 are not damaged, the fins 18 and 38 restrict the relative rotation of the fins 18 and 38, thereby reliably preventing the screw from being loosened.

The pins 18 and 38 are retained at positions inserted through the second holes 17 and 37 and the first holes 16 and 36 by the urging force of the springs 19 and 39 So that the loosening of the screw is prevented.

(Second Embodiment)

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In the screw loosening preventing structure 60 according to the second embodiment, the first member and the second member (the bolt 55 and the main body 53), which are screwed through the screws 51 and 52, And the pin 63 is interposed between the first and second members (the bolt 55 and the engaged member 54).

The body to be fastened 54 is fastened to the main body 53 through the bolt 55. A bolt hole (56) through which the bolt (55) is inserted is formed in the engaged member (54). A male screw 51 is formed on the threaded portion 55B of the bolt 55 while a female screw 52 is formed on the screw hole 53A of the main body 53. [

Between the bolt 55 and the engaged member 54, a screw loosening preventing structure 60 for restricting the relative rotation of the bolt 55 and the engaged member 54 is provided.

The screw loosening preventing structure 60 includes a first hole 57 and a first through hole 58 formed in the head portion 55A of the bolt 55 and a second hole 57 formed in the engaged member 54 A pin 63 inserted through the first hole 57 and the second hole 59 and a pin 63 interposed between the second hole 59 and the pin 63 from the second hole 59 And a spring (64) for pressing in a direction of pushing out by one hole (57). The pin 63 is inserted through the second hole 59 and the first hole 57 by the urging force of the spring 64 so that the relative rotation of the engaged member 54 and the bolt 55 is restricted.

The first hole 57 and the second hole 59 are formed so as to extend in parallel with the central axis of the bolt 55 and are engaged with each other with the engaged member 54 fastened through the bolt 55 And is arranged to extend coaxially.

The first through hole 58 extends coaxially with the first hole 57 and is formed to penetrate the head portion 55A of the bolt 55. [ The first through hole 58 is formed with a female screw 61 whose inner periphery is screwed with a screw-shaped jig (not shown). The jig has a length which is located near the opening end of the first hole 57 and closes the opening end when the jig is inserted through the first through hole 58 and provided on the bolt 55. [ Although a screw-shaped jig is used in the present embodiment, the present invention is not limited thereto. For example, a bar-shaped rod which can slide in the axial direction of the first through hole may be used.

The process of mounting the clamped member 54 to the main body 53 through the bolts 55 is performed by the following steps.

[Jig mounting process]

A jig (not shown) is inserted through the first through hole 58 and the opening end of the first hole 57 is closed by the tip of the jig.

[Member fastening step]

After the spring 64 and the pin 63 are inserted into the second hole 59 of the engaged member 54 and the male screw 51 of the bolt 55 is screwed to the female screw 52 of the main body 53 And the engaged member 54 is fastened to the main body 53 through the bolts 55. [

[Release prevention process]

The bolt 55 is twisted to a position where the head portion 55A contacts the clamped member 54 with a predetermined surface pressure and then the jig is taken out from the first hole 57. [ Subsequently, the bolt 55 is twisted with a predetermined tightening torque, and the first hole 57 and the second hole 59 are engaged with each other while the bolt 55 is rotated by one rotation with respect to the engaged member 54 . The pin 63 which is extruded from the second hole 59 by the urging force of the spring 64 is moved from the second hole 59 to the second hole 59 by the engagement of the first hole 57 and the second hole 59, 1 hole 57 in the longitudinal direction. Relative rotation of the engaged member 54 and the bolts 55 relative to each other is restricted by the pin 63, whereby the loosening of the bolt 55 is prevented.

The jig may be ejected from the first hole 57 in a state in which the first hole 57 and the second hole 59 are aligned with each other.

When the fastening by the bolt 55 is released, a screw-shaped jig is screwed into the first through hole 58 and inserted into the first hole 57, and the pin 63 is pressed against the urging force of the spring 64 And is extruded from the first hole 57. Therefore, it is possible to repeatedly attach and detach the bolt 55.

(Third Embodiment)

Hereinafter, a third embodiment of the present invention will be described with reference to FIG. The screw loosening preventing structure 70 according to the third embodiment is provided with the third member 55 between the first and second members (the bolt 55 and the main body 53) that are threaded through the screws 51 and 52, And the pin 73 is inserted through the first, second, and third members (the bolt 55, the main body 53, and the engaged member 54). The same reference numerals are assigned to the same components as those of the second embodiment, and a description thereof is omitted. In the second embodiment, the first member is the bolt 55, the second member is the engaged member 54, and the third member is the main body 53. [ On the other hand, in the third embodiment, the first member is the bolt 55, the second member is the main body 53, and the third member is the engaged member 54.

Between the bolt 55, the engaged member 54 and the main body 53, a screw loosening preventing structure 70 for restricting relative rotation is provided.

The screw loosening preventing structure 70 includes a first hole 57 and a first through hole 58 formed in the head portion 55A of the bolt 55 and a third hole 57 formed in the engaged member 54 A second hole 78 formed in the main body 53 and a pin 73 inserted through the first hole 57 and the third hole 79 and the second hole 78, And a spring 64 which is interposed between the two holes 78 and presses the pin 73 in the direction of pushing out the second hole 78. The pin 73 is inserted through the third hole 79 and the first hole 57 by the urging force of the spring 64 so that the relative rotation of the engaged member 54 and the bolt 55 is restricted, The relative rotation of the main body 53 and the engaged member 54 is regulated by inserting the pin 73 through the second hole 78 and the third hole 79.

The first hole 57, the third hole 79 and the second hole 78 are formed so as to extend in parallel with the central axis of the bolt 55 and the engaged member 54 is fastened through the bolt 55 And are coaxially arranged to coincide with each other.

The process of mounting the clamped member 54 to the main body 53 through the bolts 55 is performed by the following steps.

[Jig mounting process]

A jig (not shown) is inserted through the first through hole 58 and the opening end of the first hole 57 is closed by the tip of the jig.

[Member fastening step]

A spring 64 is interposed between the second hole 78 of the main body 53 and the third hole 79 of the engaged member 54 After inserting the pin 73, the male screw 51 of the bolt 55 is screwed into the female screw 52 of the main body 53 and the bolt 55 is twisted.

[Release prevention process]

The bolt 55 is twisted to a position where the head portion 55A contacts the clamped member 54 with a predetermined surface pressure and then the jig is taken out from the first hole 57. [ Subsequently, while the bolt 55 is twisted with a predetermined tightening torque and the bolt 55 is rotated once with respect to the engaged member 54, the first hole 57 is engaged with the third hole 79 and the second hole Fit into the hole (78). The fins 73 that are extruded from the third hole 79 by the urging force of the spring 64 are inserted over the third hole 79 and the first hole 57. As a result, Relative rotation of the main body 53 and the engaged member 54 and the bolt 55 is restricted by the pin 73 so that the bolt 55 is prevented from being loosened and the position of the engaged member 54 is determined .

The first hole 57 and the second hole 78 are formed in the same manner as the first hole 57 and the second hole 78, As shown in Fig.

When the fastening by the bolt 55 is released, a screw-shaped jig is screwed into the first through hole 58 and inserted into the first hole 57, and the pin 73 is pressed against the urging force of the spring 64 And is extruded from the first hole 57. As a result, the bolts 55 can be repeatedly attached and detached.

As described above, in the screw loosening preventing structure 70 of the third embodiment, the engaged member 54 (the first member) and the engaged member 54 (the second member) interposed between the bolt 55 Since the third hole 79 through which the pin 73 is inserted is formed in the member to be fastened (third member) 54 (the third member) Relative rotation of the bolt 55 and the main body 53 is restricted so that the bolt 55 can be prevented from loosening and the engaged member 54 can be positioned.

(Fourth Embodiment)

Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. In the screw loosening preventing structure 80 according to the fourth embodiment, the third member (the bolt 55 and the main body 53), which is screwed through the screws 51 and 52, And the pin 84 is inserted through the second and third members (the bolt 55 and the engaged member 54). The same components as those of the second embodiment are denoted by the same reference numerals and the description thereof is omitted. In the second embodiment, the first member is the bolt 55, the second member is the engaged member 54, and the third member is the main body 53. [ On the other hand, in the fourth embodiment, the first member is the main body 53, the second member is the bolt 55, and the third member is the engaged member 54. [

Between the bolt 55 and the clamped member 54, a screw loosening preventing structure 80 for restricting the relative rotation of the bolt 55 and the clamped member 54 is provided.

The screw loosening preventing structure 80 includes a second hole 82 and a second through hole 83 formed in the head portion 55A of the bolt 55 and a first hole 82 formed in the engaged member 54 A pin 84 inserted through the second hole 82 and the first hole 81 and a pin 84 interposed between the second hole 82 and the pin 84 from the second hole 82 And a spring (85) for pressing in a direction of pushing out by one hole (81). The pin 84 is inserted through the second hole 82 and the first hole 81 by the urging force of the spring 85 so that the relative rotation of the bolt 55 and the engaged member 54 is regulated.

The second hole 82 and the first hole 81 are formed so as to extend in parallel with the central axis of the bolt 55 and are engaged with each other with the engaged member 54 fastened through the bolt 55 And is arranged to extend coaxially.

The second through hole 83 extends coaxially with the second hole 82 and is formed to penetrate through the head portion 55A of the bolt 55. [ And a rod-shaped jig (not shown) is inserted into the second through hole 83.

The pin 84 is formed with a screw hole 86 that opens to its end face. A screw (not shown) formed at the tip of the jig is screwed into the screw hole 86. The jig has a length such that the tip of the jig is engaged with the pin 84 in a state where the jig is inserted through the second through hole 83 and provided in the bolt 55.

The process of mounting the clamped member 54 to the main body 53 through the bolts 55 is performed by the following steps.

[Jig mounting process]

The jig is inserted into the second through hole 83 and the second hole 82 after the spring 85 and the pin 84 are inserted into the second hole 82 of the bolt 55, Screw the screw into the screw hole (86) of the pin (84). By pulling out the jig connected to the pin 84 in this way, the pin 84 is held in the state of being pulled into the second hole 82. [

[Member fastening step]

The male screw 51 of the bolt 55 is screwed to the female screw 52 of the main body 53 and the engaged member 54 is fastened to the main body 53 through the bolt 55. [

[Release prevention process]

The bolt 55 is twisted to a position where the head portion 55A contacts the clamped member 54 with a predetermined surface pressure and then the jig is removed from the pin 84 and ejected from the second hole 82. [ Subsequently, the bolt 55 is twisted with a predetermined tightening torque, and the second hole 82 and the first hole 81 are aligned with each other while the bolt 55 is rotated once with respect to the engaged member 54 . The pin 84 which is extruded from the second hole 82 by the urging force of the spring 85 is moved from the second hole 82 to the second hole 82 by the urging force of the spring 85, 1 < / RTI > Relative rotation of the engaged member 54 and the bolts 55 relative to each other is restricted by the pin 84, thereby preventing the bolt 55 from loosening.

The jig may be removed from the pin 84 in the state where the second hole 82 and the first hole 81 coincide with each other so that the second hole 82 As shown in Fig.

The jig is inserted into the second through hole 83 and the second hole 82 and the screw at the tip of the jig is inserted into the screw hole 86 of the pin 84 Screw together. By pulling out the jig connected to the pin 84 in this manner, the pin 84 is pulled into the second hole 82 and ejected from the first hole 81. [ As a result, the bolts 55 can be repeatedly attached and detached.

The jig and pin 84 are not limited to the above-described configuration, and may be configured to draw the pin 84 into the second hole 82 through the hook.

As described above, in the screw loosening preventing structure 80 of the fourth embodiment shown in Fig. 7, the second through hole 83 communicating with the second hole 82 is formed in the bolt 55, 2 through-hole 83 and inserted into the second hole 82 is used. When the bolt 55 (second member) is twisted, the jig penetrates the second through hole 83 from the outside and is inserted into the second hole 82. The jig pulls the pin 84 into the second hole 82 against the urging force of the spring 85 (urging member) to regulate the entry of the pin 84 into the first hole 81, It is possible to repeatedly perform the detachment and attachment of the locking member 55.

(Fifth Embodiment)

Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. In the screw loosening preventing structure 100 according to the fifth embodiment, the first and second members (the nut 103 and the bolt 104), which are threaded through the screws 102 and 101, Four members (engaged members 105 and 106) are fitted and supported. The pins 107 are inserted into the first and second members (the bolts 104 and the engaged members 105) and the pins 107 are inserted into the first and fourth members (the nuts 103 and the engaged members 106) The pin 108 is inserted.

The to-be-tightened members 105 and 106 are fastened through the bolts 104 and the nuts 103. [ Bolted holes 115 and 116 through which the bolts 104 are inserted are formed in the engaged members 105 and 106, respectively. The male thread 101 is formed on the threaded portion 104B of the bolt 104 and the female thread 102 is formed on the inner circumference of the nut 103. [ The screw loosening structure 100 regulates the relative rotation of the bolt 104 and the nut 103 through the pins 107,

The first pin 107 is installed over the second hole 114 formed in the head portion 104A of the bolt 104 and the third hole 117 formed in the engaged member 105, Regulate rotation.

The second pin 108 is provided over the nut 103 and the engaged member 106, and regulates the relative rotation of the two.

The to-be-tightened member 106 is formed with a base end portion of the second fin 108 and a fourth hole 113 into which the spring 109 is inserted. The nut 103 is formed with a first hole 111 into which the tip of the second pin 108 is inserted and a first through hole 112 extending coaxially with the first hole 111.

A jig (not shown) is inserted into the first through hole 112 when the nut 103 is twisted, and the opening end of the first hole 111 is clogged by the tip of the jig. After the nut 103 is twisted until it comes into contact with the fastened member 106, the jig is taken out from the first hole 111. Subsequently, the nut 103 is twisted with a predetermined torque, and the first hole 111 is aligned with the fourth hole 113, while the nut 103 is rotated by one turn with respect to the bolt 104. A second pin extruded from the fourth hole 113 is inserted through the first hole 111 and the fourth hole 113 by the urging force of the spring 109. [

In order to release the fastening by the nut 103, the threaded jig is screwed into the first through hole 112 and inserted into the first hole 111, and the second pin 108 is inserted into the spring 109 from the first hole (111). As a result, it is possible to repeatedly attach and detach the nut 103. The jig has a length which is located near the opening end of the first hole 111 and closes the opening end when the jig is inserted through the first through hole 112 and provided on the nut 103. In this embodiment, a screw-shaped jig is used, but the present invention is not limited thereto. For example, a rod-shaped rod which can slide in the axial direction of the first through hole 112 may be used.

As described above, in the screw loosening preventing structure 100, the rotation of the nut 103 is restricted by the second pin 108 held by the pressing force of the spring 109, The rotation of the bolt 104 is restricted.

The first pin 107 for restricting the rotation of the bolt 104 may also be held by the pressing force of the spring similarly to the second pin 108. [

The screw loosening preventing structure of the nut 103 may be the same as the screw loosening preventing structure 35 shown in Fig. Specifically, a second hole is formed which opens to the outer periphery of the threaded portion 104B of the bolt 104. Springs and fins are received in the second hole, while the inner periphery (female thread 102) The first hole may be formed to be open to the outside. In this case, as the nut 103 is twisted, the pin is inserted through the second hole and the first hole by the urging force of the spring, and relative rotation of the nut 103 is restricted.

Although the embodiments of the present invention have been described above, the above embodiments are only illustrative of some of the application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments.

Claims (6)

(15, 35) for restricting relative rotation of the first member (5, 31, 55, 53) and the second member (4, 7, 54, 53, 55) , 60, 70, 80)
A first hole (16, 36, 57, 81) formed in the first member (5, 31, 55, 53)
Second holes (17, 37, 59, 78, 82) formed in the second member (4, 7, 54, 53, 55)
(18, 38, 63, 73, 84) inserted into the second hole (17, 37, 59, 78, 82)
Wherein the first hole is formed in the first hole and the second hole is formed in the second hole so that the pin can be extruded from the second hole, (19, 39, 64, 85) for urging the movable member
The pins (18, 38, 63, 73, 84) are fixed to the first member (5, 31, 55, 53) and the second member The first hole (16, 36, 57, 81) and the second hole (17, 37, 59, 78, 82) (15, 35, 60, 70, 80) inserted through the holes (17, 37, 59, 78, 82). The method according to claim 1,
And the pin (18, 38, 63, 73, 84) is inserted into the first hole (16, 36, 57, 81) or the second hole (17, 37, 59, (15, 35, 60), further comprising through holes (21, 41, 58) through which a jig (25) for moving against the pressing force of the members (19, 39, 64, 85) , 70, 80). 3. The method of claim 2,
The through holes 21, 41 and 58 are formed in the first member 5, 31, 55 and 53 in communication with the first holes 16, 36, 57 and 81,
When the first member 5, 31, 55, 53 is twisted, the jig 25 closes the opening end 16B of the first hole at the tip end 25C, and the pressing members 19, 39, 38, 63, 73, and 84 that are extruded from the second holes 17, 37, 59, 78, and 82 by the pressing force of the first holes 16, , 81) of the screw loosening structure (15, 35, 60, 70, 80). 3. The method of claim 2,
The through holes 21, 41 and 58 are formed in the second member 4, 7, 54, 53 and 55 in communication with the second holes 17, 37, 59, 78 and 82,
The jig 25 is configured to press the pins 18, 38, 63, 73 and 84 against the pressing members 19, 39, 64, and 55 when the second member 4, 7, 54, 53, 38, 63, 73, 84 to the second holes (17, 37, 59, 78, 82) against the pressing force of the first holes , 81) of the screw loosening structure (15, 35, 60, 70, 80). 5. The method according to any one of claims 1 to 4,
And a third member (54) interposed between the first member (55) and the second member (53)
And a third hole (79) through which the pin (73) is inserted is formed in the third member (54). A screw loosening preventing structure (100) for restricting relative rotation of a first member (103) and a second member (104) coupled by screwing of screws,
A third member 105 interposed between the first member 103 and the second member 104,
A fourth member 106 interposed between the first member 103 and the third member 105,
A first hole 111 formed in the first member 103,
A second hole 114 formed in the second member 104,
A third hole 117 formed in the third member 105,
A fourth hole 113 formed in the fourth member 106,
A first pin (107) inserted through the second hole (114) and the third hole (117)
A second pin 108 inserted into the fourth hole 113,
And a pressing member (109) interposed in the fourth hole (113) and pressing the second pin (108) in a direction of pushing out the fourth hole (113)
When the first hole 111 and the fourth hole 113 are aligned with each other by the relative rotation of the first member 103 and the second member 104, Is inserted over the first hole (111) and the fourth hole (113).
KR20157002032A 2012-07-23 2013-06-13 Screw loosening prevention structure KR20150032727A (en)

Applications Claiming Priority (3)

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JPJP-P-2012-162566 2012-07-23
JP2012162566A JP5934593B2 (en) 2012-07-23 2012-07-23 Screw locking structure
PCT/JP2013/066362 WO2014017209A1 (en) 2012-07-23 2013-06-13 Screw loosening prevention structure

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CN (1) CN104487719B (en)
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JP5934593B2 (en) 2016-06-15
CN104487719A (en) 2015-04-01
CN104487719B (en) 2017-09-22
WO2014017209A1 (en) 2014-01-30
IN2015KN00442A (en) 2015-07-17

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