JP2001289224A - External screw member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of loosening a clamp-fixed stud by the force of detaching a wrench when detaching the wrench from the stud since the wrench is screwed with an external thread on the outer periphery to clamp-fix the stud to an oil pump cover or the like in the case of the stud for fixing an oil filter, and low work efficiency due to requiring many man-hours for releasing a screwed state after preliminarily screwing and fastening the stud to the wrench. SOLUTION: This external screw member is provided with an external screw 1 provided on the outer peripheral surface of a round bar body, a through hole 2 piercing the axial center of the round bar body, and an engaging part provided at least at one end of the round bar body, communicating with the through hole 2, and engaged with a tool when rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a male screw member for mounting an oil filter or a fuel filter.

[0002]

2. Description of the Related Art Conventionally, for example, an oil filter OF for removing dust and the like in lubricating oil of an engine EG is shown in FIG.
As shown in FIG. 0, the stud STA is a male screw member having a male screw formed on the outer periphery of a round bar having a through hole TH. Normally, as shown in FIG. 11, the oil filter OF is attached to the wrench WRS having the female screw hole SH until the stud STA is no longer screwed, and the other end of the stud STA to which the wrench WRS is not screwed. Is applied to the mounting hole of the oil pump cover OP fixed to the engine EG, and the wrench WRS is rotated.

[0003]

However, the stud S
Wrench WRS stud STA to rotate TA
Is in a state where the stud STA and the wrench WRS are fastened. That is, since the wrench WRS is also a female screw, the stud STA is securely screwed into the female screw hole of the wrench WRS until the end of the stud STA comes into contact with the end of the female screw hole of the wrench WRS, and then the stud STA is attached. If not, a wrench WRS will be attached to the stud STA during the mounting work of the stud STA.
Is idle, so that the stud STA is not smoothly mounted.

[0004] When a torque wrench is used, the stud STA must be tightened with a torque larger than that of the threaded state of the stud STA and the torque wrench. Since the screwing of the STA and the torque wrench also depends on the torque, it was not easy to remove the torque wrench from the stud STA. In some cases, the external thread of the stud where the torque wrench is screwed may be broken.

On the other hand, if the wrench WRS is to be removed from the stud STA after the stud STA has been mounted, the wrench WRS and the stud STA are securely screwed together. Before the screw is loosened, the stud STA may rotate in the loosening direction together with the wrench WRS, and the tightened stud STA may be loosened. For this reason, when removing the wrench WRS, it is necessary to remove the wrench WRS by, for example, attaching a hand so that the stud STA does not rotate following the rotational direction in which the wrench WRS is disengaged. The oil filter OF is mounted in a state where the stud STA that has been once tightened is loose, and the mounting of the oil filter OF may be incomplete during operation of the engine EG. In such a case, the oil filter O
In some cases, the seal between F and the oil pump cover OP was incomplete, and oil leaked from the seal. Further, the stud STA may be detached from the oil pump cover OP together with the oil filter OF to be replaced, and a situation arises in which the stud STA must be fixed to the oil pump cover OP again.

An object of the present invention is to solve such a problem.

[0007]

In order to achieve the above object, the present invention takes the following measures. That is, the stud according to the present invention has a male screw on the outer peripheral surface of the round bar body, has a through hole extending in the axial direction at the center thereof, and has an engaging portion for engaging a tool at at least one end. In this configuration, the tool can be rotated and tightened by engaging the engaging portion without engaging the tool with the male screw.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a male screw provided on the outer peripheral surface of a round bar, a through-hole passing through the center of the round bar in the axial direction, and at least one end of the round bar. A male screw member comprising: an engaging portion that communicates with the through hole and engages with a tool when the tool is rotated.

According to such a configuration, since the round bar is provided with the through hole, it can be used for fixing an oil filter or the like. Then, since the tool is engaged with the engaging portion and rotated, the tool can be fastened and fixed to the oil pump cover or the like without screwing the tool into the male screw. In addition, since the tool is not engaged with the male screw but is engaged only with the engaging portion, if the engagement is released, the tool can be easily removed from the concave portion, and the tool is loosened when the tool is removed. No external force is applied in the direction. Therefore, it is possible to solve the problem that the male screw member once tightened and fixed is loosened.

The engaging portion is preferably a polygonal concave portion opened at the end of the round bar. With such a concave portion, engagement of the tool can be facilitated.

[0011] The engaging portion may be a polygon having an outer diameter smaller than the external diameter of the male screw at the end of the round bar and a communication hole communicating with the through hole. It may be formed of a convex portion having a shape. With such a protrusion, it is possible to avoid preparing a special tool by making the shape of the protrusion correspond to the shape of a commercially available box wrench.

In order to eliminate the directionality at the time of mounting, it is preferable that the engaging portions are provided at both ends of the round bar. In this manner, if the engaging portions are provided at both ends of the round bar body, since there are engaging portions at both ends, when engaging the tool,
Work can be performed without checking the end.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

A stud ST which is a male screw member shown in FIGS. 1 to 3 is for mounting an oil filter of an engine, and has a male screw 1 formed over the entire length of the outer peripheral surface of a round bar body, and has an axial center. Is provided with a through hole 2 and a concave portion 3 which is an engagement portion with a fastening tool is provided at both ends. Since the mounting structure of the oil filter is the same as that of the conventional example, it is not shown. In FIG. 3, the male screw 1 is shown to show the internal structure.
Are partially omitted.

The through hole 2 extends over the entire length of the round bar. In addition, concave portions 3 communicating with the through holes 2 are provided at both ends of the round bar. The recess 3 is where a tool, that is, a wrench WR, which is a fastening tool, is engaged when the stud ST is fixed to the oil pump cover OP. When the tip shape of the wrench WR is a star-shaped dodecagon, the cross-sectional shape of the concave portion 3 is formed in a star-shaped dodecagon shape according to the shape of the wrench WR, and the center thereof is a round bar. It is aligned with the central axis. When the wrench WR is engaged with the recess 3, the recess 3 is larger than the inner diameter of the through-hole 2 so that the wrench WR engages the recess 3 while securing a necessary and sufficient engagement length. And has an inner diameter slightly larger than the outer dimension of the wrench WR, and has a bottom surface 3a. When the wrench WR is inserted, the tip WRa of the wrench WR
Is in contact with the bottom surface 3a.
In such a stud ST, after forming the through hole 2 in the round bar body, the concave portion 3 may be formed by electric discharge machining or the like, but the through hole 2 and the concave portion 3 are formed by forging, and then the outer periphery is formed. It is preferable to process the male screw 1 of the above.

In such a stud ST, first, one of the recesses 3 is engaged with a wrench WR, and in this state, is screwed into a stud mounting female screw hole of the oil pump cover OP. Next, the wrench WR is rotated, and the stud ST is tightened and fixed. In this case, since the recess 3 of the stud ST corresponds to the tip shape of the wrench WR, the stud ST and the wrench WR are not engaged with each other by the frictional force in the rotating direction. The studs ST are fixed to the oil pump cover OP by the tightening force applied to the wrench WR without the wrench WR slipping in the rotation direction in the concave portion 3 in a state where the corners of the respective star shapes are engaged. It is. The wrench WR is a stud S
Since the inner diameter of the concave portion 3 of T is slightly larger than the outer size of the wrench WR, the wrench WR can be quickly removed from the stud ST by moving the wrench WR in the central axis direction of the stud ST. That is, when the wrench WR is removed from the stud ST, no external force such as a rotational force required for removing the wrench WR acts on the tightened and fixed stud ST, so the stud ST maintains the tightened state and is loosened. Nothing.

Therefore, the work of attaching the stud ST can be shortened. Further, when the oil filter attached to the stud ST is removed for replacement, it is possible to prevent the stud ST from rotating and loosening with the rotation of the oil filter. In addition, if a motor or a high-pressure pneumatic tool capable of setting a rotational torque is used, the stud ST can be mounted with a constant tightening torque at all times, and the reliability of the mounting is improved. Can be. Further, since the studs ST are formed with the concave portions 3 at both ends thereof, the operator does not look at the ends of the studs ST picked up, that is, without confirming the direction of the studs ST, the wrench WR without the studs S
T can be engaged.

The shape of the recess may be as shown in FIGS. That is, in the above embodiment, the cross section of the recess 3 is a star-shaped regular dodecagon, but the recess 103 shown in FIG. 4 is a square, the recess 203 shown in FIG. The concave portion 303 shown in FIG.
The concave portion 403 shown in the figure is a regular dodecagon, and the tool and the concave portions 103, 203, 30 are rotated in the rotation direction when the tool is tightened.
3, 403, and 503 may be any shape that can be engaged.
Further, as shown in FIG. 8, a rectangular parallelepiped-shaped or groove-shaped concave portion 50 reaching both ends of the external thread 1 formed on the outer peripheral surface is provided.
It may be three.

The present invention is not limited to the embodiment described above, and the engagement portion with the tool may be a projection. That is, in the other embodiment shown in FIG. 9, the engaging portion with the tool has a hexagonal convex portion 5 provided at the end of the round bar with an outer diameter smaller than the external shape of the male screw 1. It consists of That is, the stud ST2 of this embodiment has a hexagonal column-shaped projection 5 having the same shape as a standard nut.
have. The protrusion 5 is formed integrally with the round bar body, is smaller than the external dimensions of the male screw 1, and has a through hole 2.
And has a height smaller than the depth of the recess of the box wrench, which is a fastening tool. The projection 5 has a communication hole 5 a having the same diameter as the through hole 2 and communicating with the through hole 2. Such protrusions 5 are formed by forging.

As long as the projection 5 is provided,
The stud ST2 can be tightened in the same manner as tightening the nut with a box wrench. Moreover, similarly to the above embodiment, after the stud ST2 is tightened, the box wrench can be removed from the stud ST2 without applying a rotational force in a direction to loosen the stud ST2, and the stud ST2 is securely fixed to the oil pump cover OP. be able to.

The shape of the convex portion 5 may be, for example, a cubic shape, a rectangular parallelepiped shape, a star-shaped regular dodecagonal column shape, an elliptical column shape, or the like, similarly to the above-described concave portions 3, 103 to 503. . In such a case, any shape may be used as long as the shape of the engagement portion of the fastening tool that engages with the protrusion 5 corresponds to the shape of the protrusion.

In addition, the configuration of each section is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0023]

As described above, according to the present invention, since the round rod is provided with the through hole, it can be used for fixing an oil filter or the like. Then, since the tool is rotated by engaging the tool with the engaging portion, the tool can be fastened and fixed to an oil pump cover or the like without screwing the tool to the male screw. Also, since the tool is not engaged with the male screw but only engaged with the engaging portion, if the engagement is released, it can be easily removed from the concave portion, and the tool used for tightening can be removed. Since no external force in the loosening direction is applied when detaching, it is possible to solve the problem that the male screw member once tightened and fixed is loosened.

If the engaging portion is formed of a polygonal concave portion opened at the end of the round bar, it is possible to easily engage the tool. Further, the engaging portion has an outer diameter dimension smaller than the external diameter of the external thread at the end of the round bar body, and has a communication hole communicating with the through hole, and a polygonal projection provided on the round bar body. In this case, it is possible to avoid preparing a special tool by making the shape of the projection correspond to the shape of a commercially available box wrench.

If the engaging portions are provided at both ends of the round bar, since there are engaging portions at both ends, when engaging the tool, the operation can be performed without confirming the end portions. It can be performed.

[Brief description of the drawings]

FIG. 1 is a front view showing a part of an embodiment of the present invention in cross section.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a perspective view showing a relationship with the tool of the embodiment.

FIG. 4 is a plan view of a first modified example of a concave shape according to the present invention.

FIG. 5 is a plan view of a second modification of the concave shape according to the present invention.

FIG. 6 is a plan view of a third modification of the concave shape according to the present invention.

FIG. 7 is a plan view of a fourth modification of the concave shape according to the present invention.

FIG. 8 is a plan view of a fifth modification of the concave shape according to the present invention.

FIG. 9 is a perspective view of another embodiment of the present invention.

FIG. 10 is a sectional view showing a conventional oil filter mounting structure.

FIG. 11 is an enlarged sectional view of a main part showing a relationship between a stud and a wrench in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Male screw 2 ... Through hole 3 ... Concave part 5 ... Convex part 5a ... Communication hole

Claims (4)

[Claims] An external thread provided on an outer peripheral surface of a round bar, a through-hole passing through an axial center of the round bar, and a through-hole provided at at least one end of the round bar and communicating with the through-hole. A male screw member comprising: an engagement portion with which a tool is engaged when rotating. 2. The male screw member according to claim 1, wherein the engaging portion comprises a polygonal concave portion opened at an end of the round bar. 3. A polygonal shape provided on the round bar body, wherein the engaging portion has an outer diameter smaller than the external diameter of the male screw at an end of the round bar body and has a communication hole communicating with the through hole. The male screw member according to claim 1, wherein the male screw member comprises: 4. The male screw member according to claim 1, wherein the engaging portions are provided at both ends of the round bar.