JP2002221215A - Screw-connecting structure for connecting pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw-connecting structure for a connecting pin enhanced in mass productivity, capable of reducing torque by forming the diameter of a fastening head of a fastening screw for release prevention (whirl-stop) into a small diameter, and further forming the head so as not to largely protrude outwardly and not to be exposed, and also capable of preventing the screw from being easily released. SOLUTION: The connecting structure is configured so that a screw-shielding part 2A formed at the end of the connecting pin 2 from one side of a screw through hole 1A for connection formed at a connected member 1, and the fastening screw 4 is screwed into a fastening screw hole 3 formed at the tip face of the screw-shielding part 2A from the other side of the screw through hole 1A, to perform the whirl-stop. Also in the structure, a washer 7 is housed in a washer-housing recess 6 formed at the end of the screw through hole 1A in a state of whirl-stopping, and the fastening screw 4 is fastened to the fastening screw hole 3 through an insertion hole 8 formed at the washer 7 in the state of whirl-stopping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw connection structure for connecting a connection pin such as a shackle locking shaft bolt (shackle pin) or a pulley shaft pin in a non-rotating state. is there.

[0002]

2. Description of the Related Art For example, a connecting pin such as a shackle shackle pin (locking shaft bolt) is provided on a member to be connected (an end of a U-shaped shackle body). From the inside of the through screw hole, a screw rod provided at the end of the connecting pin is inserted and screwed, and from the outside of the connecting through screw hole to a fastening screw hole provided on the distal end surface of the screw rod. Attach the fastening screw to prevent loosening,
Since the fastening screw performs a rotation preventing function and a retaining function, the fastening head of the fastening screw is larger in diameter than the diameter of the connecting through screw hole.

[0003] Therefore, if the fastening head of the fastening screw exposed to the outside hits something or is subjected to vibration, the fastening may be loosened and the locking function may not be achieved.

[0004] This is because the fastening head of the fastening screw has a large diameter and a large torque.

In view of the above-mentioned situation, the present invention is configured such that a fastening head of a fastening screw for preventing loosening (rotation) is made small in diameter, and furthermore, is not exposed so as to protrude largely outward. The torque can be reduced, preventing the loosening of the tightening dramatically, and also fulfills the function of retaining.
It is an object of the present invention to provide a revolutionary connection structure of connection pins which is easy to manufacture and excellent in mass productivity.

[0006]

The gist of the present invention will be described with reference to the accompanying drawings.

[0007] The connecting through screw hole 1 provided in the connected member 1
A from one side, a screw rod 2A provided at the end of the connecting pin 2
Of the connecting pin for screwing the fixing screw 4 into the fixing screw hole 3 provided on the tip end surface of the screw rod portion 2A from the opposite side of the connecting through screw hole 1A. In the screw connection structure, the diameter of the fastening head 4A of the fastening screw 4 screwed into the fastening screw hole 3 is set smaller than the diameter of the connection through screw hole 1A.
A storage seat 5 to be housed by the tightening head 4A is formed in the end of the connecting threaded screw hole 1A in a recessed manner.
Is formed at a position for closing the connecting through screw hole 1A, and an insertion hole 8 of the fastening screw 4 communicating with the fastening screw hole 3 is formed at the bottom of the storage seat portion 5. The present invention relates to a screw connection structure of a connection pin.

A threaded rod portion 2A provided at an end of the coupling pin 2 is inserted and screwed from one side of the coupling through screw hole 1A provided in the coupled member 1, and a distal end surface of the threaded rod portion 2A. In the screw connection structure of the connecting pin for screwing the fastening screw 4 into the fastening screw hole 3 provided on the other side of the fastening screw hole 1A from the opposite side to prevent loosening, the connection through screw hole 1A The washer 7 is stored in the washer receiving recess 6 formed at the end in a detented state, and the fixing screw 4 is inserted into the fixing screw hole 3 through an insertion hole 8 provided in the washer 7 in the detented state. The present invention relates to a screw connection structure of a connection pin, wherein the connection pin is screwed and fastened.

3. The screw connection structure according to claim 2, wherein said washer is provided with a storage seat portion for housing said fastening head of said fastening screw. It is.

The insertion hole 8 is provided at the bottom of the storage seat 5 formed in the washer 7 and the fastening screw 4 is screwed into the fastening screw hole 3 through the insertion hole 8. The screw connection structure according to claim 3, wherein the lower surface of the fastening head (4A) of the fastening screw (4) is configured to be pressed against the bottom surface of the storage seat (5). It is.

The diameter of the fastening head 4A of the fastening screw 4 screwed into the fastening screw hole 3 is set smaller than the diameter of the connecting through screw hole 1A. The present invention relates to a screw connection structure of a connection pin according to any one of 2 to 4.

Also, O is attached to the screw base of the fastening screw 4.
The ring 10 is fitted, and the O
The stepped portion 11 for locking the ring 10 is provided, according to any one of claims 1 to 5, wherein the connection pin is screwed and connected.

Further, the connecting threaded hole 1A forming portion of the connected member 1 is provided with a dividing wall for forming the storage seat portion 5 or the washer receiving recessed portion 6 at an end of the connecting threaded screw hole 1A. The screw connection structure according to claim 1, wherein the connection pin is formed thick.

The connected member 1 is a U-shaped rod,
The connecting through screw hole 1A is formed in at least one of the opposing ends of the U-shaped rod 1, and the connecting pin 2 is screwed and connected between the opposing ends in an extended state. The present invention relates to a screw connection structure of a connection pin according to any one of claims 1 to 7.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention (how to implement the invention) will be briefly described with reference to the drawings, showing the operational effects thereof.

The washer 7 is stored in the washer receiving recess 6 formed at the end of the connecting through screw hole 1A in a detented state, and is inserted through the insertion hole 8 provided in the storage seat 5 of the washer 7 in the detented state. Then, the fastening screw 4 is tightened and screwed into a fastening screw hole 3 provided in the screw rod portion 2A of the connecting pin 2 screwed into the connecting through screw hole 1A.

Therefore, the fastening screw 4 is screwed into the fastening screw hole 3 via the washer 7 which is prevented from rotating, and the screw rod portion 2A of the connecting pin 2 screwed into the connecting through screw hole 1A is loosened. This is a configuration for preventing the coming off.

Therefore, the washer 7 is formed from the connecting through screw hole 1A.
By increasing the diameter, the fastening head 4 of the fastening screw 4 is
Even if A is small in diameter, the retaining function is sufficiently achieved and the fastening head 4A of the fastening screw 4 can be reduced in diameter, so that the torque is smaller than that of the conventional fastening screw 4. In addition, since the fastening head 4A is configured to be stored in the storage seat portion 5 as described above, it is difficult to rotate even if it receives a slight impact or vibration, and the washer 7 is prevented from rotating in a state in which it is prevented from rotating. Since it is engaged with or fastened to the washer housing recess 6 at the end of the hole 1A, it does not rotate together with the fastening screw 4, so that the tightening is hardly loosened.

The same operation and effect can be obtained even if the washer 7 is integrally formed with or fixed to the connecting through screw hole 1A.

That is, instead of providing the washer 7 in a detented state, the storage seat portion 5 for housing the fastening head 4A of the fastening screw 4 is integrally formed in the end of the connecting through screw hole 1A. The bottom of the storage seat 5 is formed at a position to close the connecting through screw hole 1A, and the fastening screw 4 communicating with the fastening screw hole 3 is inserted into the bottom of the storage seat 5. The same operation and effect can be obtained even when the hole 8 is formed.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings.

This embodiment is an example in which the present invention is applied to a shackle pin of a shackle as shown in FIGS. 1 to 3 (may be applied to a shaft pin of a pulley as shown in FIG. 4. A detailed description of the case where the present invention is applied is omitted by attaching the same reference numerals as those used in the case of applying the present invention to a shackle.)
The connected member 1 is a U-shaped rod (a shackle main body), and the connecting through screw hole 1 is formed in one of the opposed ends of the U-shaped rod 1.
A is formed, and a through insertion hole 9 is formed in the other end, and the connecting pin 2 (shackle pin) is screwed and connected between the opposed ends in a bridged state.

Specifically, the connecting pin 2 is inserted through the through insertion hole 9.
Through which the screw rod 2A provided at the end of the connecting pin 2 is inserted and screwed from the inside of the connecting through screw hole 1A on the opposite side, and a fastening screw provided on the tip end surface of the screw rod 2A. Hole 3
The fixing screw 4 is attached from outside of the connecting through screw hole 1A.
Is screwed to prevent loosening by connecting a screw. However, a large washer 7 is prevented from rotating in the large washer housing recess 6 formed at the end of the connecting through screw hole 1A. For example, a square (hexagonal) washer 7 is provided in a washer storage recess 6 in a rectangular hole (hexagonal hole) so as to prevent rotation, and the fastening screw is inserted through an insertion hole 8 provided in the washer 7. 4 is screwed into the fastening screw hole 3.

The washer 7 is provided with a concave storage seat portion 5 for accommodating the fastening head 4A of the fastening screw 4, and the insertion hole 8 is provided at the bottom of the storage seat portion 5. When the fastening screw 4 is screwed into the fastening screw hole 3, the lower surface of the fastening head 4A of the fastening screw 4 is configured to be pressed against the bottom surface of the storage seat portion 5 (in this embodiment, this bottom surface is The flat surface protrudes into the connecting through screw hole 1A, but may be a tapered surface as shown in FIG. 4).

That is, the tightening head 4A is housed in the storage seat portion 5 so as not to protrude outward as much as possible so as not to receive an impact or vibration. A power tool insertion hole 4B (square hole for wrench) is formed.

The diameter of the fastening head 4A of the fastening screw 4 screwed into the fastening screw hole 3 is set smaller than the diameter of the connecting through screw hole 1A. Since the diameter of the washer 7 is large, a function of preventing the washer from being performed by the washer 7 can reduce the diameter of the fastening head 4A of the fastening screw 4.

In addition, since the washer 7 is in a detented state with the connected member 1 and does not rotate together with the fastening screw 4, the washer 7 can be loosened only when the fastening head 4 A rotates. Since the diameter is small and the torque is small, it is difficult to loosen because it is difficult to turn. In addition, since a small fastening screw 4 can be employed, cost can be reduced.

Further, since the washer 7 can be removed (because it is a separate part), threading of the connecting through-thread hole 1A is easy as in the conventional case.

Further, an O-ring 10 is fitted in the concave step of the screw base of the fastening screw 4, and a step 11 is provided in the middle of the fastening screw hole 3 for engaging the O-ring 10, and tightened. Strength has been increased.

Further, the connecting through screw hole 1 of the connected member 1
The A-formed portion is formed to have a thickness corresponding to the formation of the washer housing concave portion 6 at an end of the connecting through screw hole 1A, thereby increasing strength.

The same operation and effect can be obtained even if the washer 7 is integrally formed with or fixed to the connecting through screw hole 1A.

That is, instead of providing the washer 7 by fitting in a detented state, as shown in FIG.
The storage seat portion 5 housed by the tightening head 4A is integrally formed in the end of the connection through screw hole 1A, and the bottom of the storage seat portion 5 closes the connection through screw hole 1A. The same operation and effect can be obtained even when the insertion hole 8 of the fastening screw 4 communicating with the fastening screw hole 3 is formed at the bottom of the storage seat portion 5.

FIG. 6 shows, as another example of the embodiment of FIG. 5, a case where the hole length of the insertion hole 8 is formed longer than that of FIG. It works and works.

[0034]

Since the present invention is constructed as described above, the diameter of the tightening head of the fastening screw for preventing loosening (rotation) is reduced so as not to protrude greatly outward. , It is hard to receive shock and vibration, even if it receives it, it is difficult to turn because the torque is small, it can dramatically prevent loosening easily, and it also functions as a retaining function,
It is an innovative connection pin connection structure that is easy to manufacture and has excellent mass productivity.

According to the second aspect of the present invention, a fastening screw having a small diameter can be screwed through a washer provided in a non-rotating state. In addition to being easy to process, the diameter of the washer is larger than the through screw hole for connection, so that even if the diameter of the head for fastening the fastening screw is small, the retaining function is sufficiently achieved. The torque is smaller than that of the fixing screw, and it is difficult to rotate even if it receives some shock or vibration.The washer engages with or stops in the washer receiving recess at the end of the through screw hole for connection. Since it is worn, it does not co-rotate with the fastening screw, so that an extremely innovative screw-in connection structure of the connection pin with almost no loosening is obtained.

According to the third aspect of the present invention, the degree of protrusion of the fastening screw outside the fastening head is suppressed, so that the fastening screw is less susceptible to shocks and vibrations, and the fastening screw is more resistant to loosening. The connection pin has a screw connection structure.

According to the fourth aspect of the present invention, since the fastening screw is screwed more firmly to the washer which is prevented from rotating, the fastening screw is more excellently screwed and connected structure of the connecting pin which is less likely to be loosened. Becomes

According to the fifth aspect of the present invention, the functions and effects of the present invention are further exhibited, and the sixth aspect of the present invention is provided.
In the described invention, the tightening strength is further increased.

According to the seventh aspect of the present invention, the strength is not deteriorated even when the washer is provided.

According to the eighth aspect of the present invention, the screw connection structure of the connection pin of the present invention, which exerts the above-mentioned functions and effects, can be easily applied to a shackle pin of a shackle or a shaft pin of a pulley. A screw connection structure of the connection pin having an excellent configuration.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present embodiment.

FIG. 2 is a sectional view of the present embodiment.

FIG. 3 is a cross-sectional view of another example of the present embodiment (when two shackles are integrally connected).

FIG. 4 is a cross-sectional view of another example of the present embodiment (when applied to a pulley shaft).

FIG. 5 is a sectional view of another example in which the washer portion of the present embodiment is integrally formed.

FIG. 6 is a sectional view of another example of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connected member 1A Connection threaded screw hole 2 Connection pin 2A Screw rod part 3 Fastening screw hole 4 Fastening screw 4A Fastening head 5 Storage recess 6 Washer storage recess 7 Washer 8 Insertion hole 10 O-ring 11 Step

Claims (8)

[Claims] 1. A screw rod portion provided at an end of a connection pin is inserted and screwed from one side of a connection through screw hole provided in a member to be connected, and a fastening provided on a tip end surface of the screw rod portion. In a screw connection structure of a connection pin for screwing a fastening screw into a screw hole from the opposite side of the connecting through screw hole to prevent loosening, for fastening the fastening screw screwed into the fastening screw hole. The diameter of the head is set smaller than the diameter of the connecting through screw hole,
A storage seat portion for accommodating the fastening head of the fastening screw is formed in a recess at an end of the connection through screw hole, and a bottom portion of the storage seat portion is formed at a position to close the connection through screw hole. And an insertion hole for the fastening screw, which communicates with the fastening screw hole, is formed in a bottom portion of the storage seat portion. 2. A screw rod portion provided at an end of a connection pin is inserted and screwed from one side of a connection through screw hole provided in a member to be connected, and a fastening member provided on a distal end surface of the screw rod portion. In a screw connection structure of a connection pin for screwing a fastening screw into the screw hole from the opposite side of the connection through screw hole to prevent loosening, a washer receiving recess formed at an end of the connection through screw hole. A washer is housed in a non-rotating state, and the fixing screw is tightened and screwed into the fixing screw hole through an insertion hole provided in the washer in the non-rotating state. Connection structure. 3. The screw connection structure according to claim 2, wherein said washer is provided with a storage seat portion for storing a fastening head of said fastening screw. 4. When the fastening screw is screwed into the fastening screw hole through the insertion hole, the fastening hole is provided in the bottom of the storage seat portion formed in the washer. 4. The screw connection structure according to claim 3, wherein the lower surface of the screw tightening head is pressed against the bottom surface of the storage seat. 5. The fixing screw according to claim 2, wherein a diameter of a fastening head of the fastening screw screwed into the fastening screw hole is set smaller than a diameter of the connecting through screw hole. A screw connection structure for the connection pin according to claim 1. 6. The fixing device according to claim 1, wherein an O-ring is fitted to a screw base of the fastening screw, and a step is provided in the middle of the fastening screw hole to lock the O-ring. 6. The screw connection structure of the connection pin according to any one of 5. 7. The connecting threaded screw hole forming portion of the member to be connected is formed to have a sufficient thickness to form the storage seat portion or the washer receiving recess at an end of the connecting threaded screw hole. The screw connection structure of the connection pin according to any one of claims 1 to 6, characterized in that: 8. The connecting member is a U-shaped rod.
2. The structure according to claim 1, wherein the connecting threaded screw hole is formed in at least one of the opposed ends of the character-shaped rod, and the connecting pin is screwed and connected between the opposed ends in an extended state.
The screw connection structure of the connection pin according to any one of claims 7 to 7.