JPH08261222A - Screw loosening preventing structure - Google Patents

Abstract

PURPOSE: To surely prevent screw loosening between an inner cylinder and an outer cylinder by a simple and easily manufactured structure. CONSTITUTION: The male screw 2 of an end bell 1 and the female screw 6 of a ground nut 5 are engaged with each other and the male screw 7 of the ground nut 5 and the female screw 9 of an assembly nut 8 are engaged with each other. Rotational directions for both engagements are opposite from each other. The ground nut 5 is fastened to the end bell 1 in a state (a) where the assembly nut 8 is fastened to the ground nut 5 at the deepest and after this fastening is finished, the assembly nut 8 is loosened (returned) until its right end comes into contact with the flange 4 of the end belt 1. Subsequently, a fixing screw 11 attached to the assembly nut 8 is screwed into a groove 3 fully provided around the end belt 1. Then, a state (b) is reached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing loosening of screws used in a connector for mounting a bogie (for example, a railcar).

[0002]

2. Description of the Related Art As an example of prior art, in a bogie mounting connector, a ground nut of an outer cylinder is fastened to an end bell of an inner cylinder, and a set screw is attached to the ground nut to fix the ground nut and the end bell. However, when the set screw loosens due to vibration of the vehicle body or external force, the threaded connection between the ground nut and the end bell easily loosens.

[0003]

In the conventional screw loosening prevention structure, there is a drawback in that the screw connection between the end bell of the inner cylinder and the gland nut of the outer cylinder is easily loosened.

Therefore, the present invention aims to improve the drawbacks of the conventional screw loosening prevention structure, and surely prevent loosening of the screw connection between the inner cylinder and the outer cylinder with a simple and easy-to-manufacture structure. Is.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a direction in which a male screw provided on an outer peripheral surface of an inner cylinder and a screw provided on an inner peripheral surface of an outer cylinder are engaged with each other, Of the male thread on the outer peripheral surface of the assembly nut and the direction of engagement with the screw for mounting on the inner peripheral surface of the assembly nut are reversed, and a groove is formed on the outer peripheral surface of the inner cylinder so that the screw can be inserted through the assembly nut. As a means, a screw loosening prevention structure is provided that allows a set screw to be screwed from the female thread to the groove.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A screw loosening prevention structure used in a bogie mounting connector according to an embodiment of the present invention will be described with reference to FIGS.

First, FIG. 1 shows a main part of a trolley mounting connector. (A) shows the time when the ground nut is tightened, and (b) shows the time when the ground nut is tightened.

The end bell (inner cylinder) 1 is provided with a screw 2 near its tip, a groove 3 is provided around the center thereof, and a flange 4 is provided slightly to the right of the groove 3. Has been. The gland nut (outer cylinder) 5 is provided with a female screw 6 on its inner peripheral surface near its tip and a screw 7 on its outer peripheral surface near its tip. The assembly nut 8 has a female screw 9 on its inner peripheral surface.
Is provided, and a screw 10 is provided for penetrating the thick portion of the cylinder, and a set screw 11 is screwed into the female screw 10.

A bushing 1 is attached to the tip of the end bell 1.
2 is fixed, and the sleeve 13 is fixed to the inner peripheral surface of the gland nut 5 correspondingly.

In (a), the external thread 2 of the end bell 1
And the female screw 6 of the gland nut 5 are engaged (hereinafter referred to as “A
The screws are mating. " ), And also gland nut 5
The male screw 7 and the female screw 9 of the assembly nut 8 are engaged with each other (hereinafter referred to as “B screw engagement”). A
The screw fitting and the B screw fitting have different rotation directions.

Assemble the nut 8 into the gland nut 5
(A) in the deepest tightened state, the ground nut 5 is tightened to the end bell 1, and after the tightening is completed, the assembly nut 8 is attached to the end bell 1 at its right end.
Loosen until it hits the flange 4 (return). Then, the set screw 11 attached to the assembly nut 8 is screwed into the groove 3 provided over the entire circumference of the end bell 1. Then, the state of (b) is reached.

[0012] The A screw engagement and the B screw engagement have opposite rotation directions, so they can be pressed (pulled) against each other to perform a function of preventing loosening of the screw.

Next, FIG. 2 shows an overall view of the trolley mounting connector.

In FIG. 2, members denoted by reference numerals 1 to 13 are the same as those in FIG. An O-ring 14 is interposed between the gland nut 1 and the shell 21. The ferrule 15 is accommodated in the shell 21, the grommet 17 is further accommodated in the ferrule 15, the pin insulator 19 is engaged with the grommet 17, and the pin contact 22 is attached to the pin insulator 19. The pin insulator 19 is pressed by a spring 20 and its position is regulated by a retaining ring 18 held on the inner peripheral surface of the shell 21. The end bell 1 is fixed to the shell 21 with a set screw 16. The clamp saddle 23 is fixed to the end bell 5 by screws 24 via internal tooth washers (not shown).

The materials of the above-mentioned various members will be described below with the finishing means in parentheses. End bell 1,
Ground nut 5, assembly nut 8, sleeve 1
3 and the clamp saddle 23 are aluminum alloys (zinc plated). The set screw 11, the set screw 16, and the internal tooth washer are made of steel (zinc plated). Bushing 12, O
The ring 14 and the grommet 17 are synthetic rubber. The ferrule 15 and the pin insulator 19 are synthetic resins. The retaining ring 18 and the screw 24 are made of copper alloy (zinc plated). The spring 20 is stainless steel. The shell 21 is a zinc alloy (zinc plated). The pin contact 22 is a copper alloy (silver plating).

[0016]

According to the conventional screw loosening prevention structure, the inner cylinder (end bell) and the outer cylinder (ground nut) are engaged with each other by screws, and the outer cylinder is fixed to the inner cylinder by the set screw.
The present invention does not require significant modification of the conventional screw loosening prevention structure, and basically has the following effects.

(1) By adopting a simple means of screwing the assembly nut into the outer cylinder, the screws for fixing the engagement between the inner cylinder and the outer cylinder can be loosened without significantly changing the design and manufacturing process. Can be prevented.

(2) Since the screw fitting direction of the inner cylinder and the outer cylinder and the screw fitting direction of the outer cylinder and the assembly nut are made different, external force is applied even if the truck or the like vibrates. Even in this case, it is possible to reliably prevent the screw coupling portion from loosening.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention,
(A) shows a state at the time of a ground nut tightening work, and (b) shows a state at the time of completion of a ground nut tightening work.

FIG. 2 is an overall sectional view of an embodiment of the present invention.

[Explanation of symbols]

 1 End bell (inner cylinder) 2 Male screw 3 Groove 4 Flange 5 Ground nut (outer cylinder) 6 Female screw 7 Male screw 8 Assembly nut 9 Female screw 10 Female screw 11 Set screw 12 Bushing 13 Sleeve

Claims (2)

[Claims] 1. A mating direction between a male screw provided on an outer peripheral surface of an inner cylinder and a screw provided on an inner peripheral surface of an outer cylinder, and a male screw provided on an outer peripheral surface of an outer cylinder and an inner peripheral surface of an assembly nut. The structure for preventing loosening of the screw is characterized in that the engaging direction with the screw is set to be opposite to each other. 2. The screw according to claim 1, wherein a groove is provided on the outer peripheral surface of the inner cylinder, a screw is provided for penetrating the assembly nut, and a set screw can be screwed from the female screw to the groove. Loosening prevention structure.