JP2008014361A - Screw-fastening structure for member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a screw-fastening structure for a member capable of suppressing the rotation of a bracket during screw fastening, and positively fixing the bracket without needless misalignment and rattling. <P>SOLUTION: A flat seating face 4b of a mounting seat 4 of the bracket 3 of a duct which is a resin molding to be be mounted is abutted on an outer peripheral cylinder face of a peripheral wall of a steering member 1 made of a metal pipe. In that condition, the bracket 3 is fixed by a screw 10 penetrating a position contacting the seating face 4b of the mounting seat 4 and the outer peripheral cylinder face of the peripheral wall of the steering member 1. A projected part 5 for filling a gap between the seating face 4b and the outer peripheral cylinder face of the peripheral wall of the steering member 1 is provided to the seating face 4b of the mounting seat 4. The bracket 3 is fixed to the peripheral wall of the steering member 1 by the screw 10, while the projected part 5 is plastically deformed by fastening force upon screwing the screw 10 into a screw hole 1a provided in the peripheral wall of the steering member 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a member screwing structure applied to, for example, a portion in which a duct of an air conditioner unit is screwed and fixed to a steering member of a vehicle.

  In an automobile, for example, since the air conditioner unit is close to the steering member, the duct of the air conditioner unit is generally directly screwed to the steering member.

  FIG. 6 shows a structure of a portion in which a bracket 103 integrally formed with a resin duct of an air conditioner unit is fixed to a circular pipe-shaped steering member 101 with screws 110.

  In this case, the seat surface 104b of the mounting seat 104 of the bracket 103 is brought into contact with the peripheral wall of the steering member 101, and in that state, the bracket 103 is passed through the position where the seat surface 104b and the steering member 101 are in contact, The steering member 101 is fixed to the peripheral wall.

  However, since the outer peripheral surface of the peripheral wall of the steering member 101 is a cylindrical surface, when the flat seating surface 104b of the bracket 103 is in contact with the outer peripheral cylindrical surface, the screw 110 is fixed when the screw 110 is fixed. As a result, the seating surface 104b is rotated by the screwing torque, and as a result, the duct in which the bracket 103 is integrated may be deformed or displaced.

On the other hand, as shown in FIG. 7, when the bracket 203 is fixed to the pipe-shaped member 201 with a bolt, the seat surface 204 b of the mounting seat 204 of the bracket 203 is contacted with the outer cylindrical surface of the pipe-shaped member 201. A technique for bolting the bracket 203 in a stable state while preventing rotation at the time of mounting by providing a contact wall 205 having a contact surface in advance is known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2003-127743

  By the way, as shown in FIG. 7, when the abutment wall 205 having a contact surface along the outer peripheral cylindrical surface of the pipe-shaped member 201 is provided on the seating surface 204 b of the mounting seat 204 of the bracket 203, In addition, the bracket 203 can be fixed without rattling while preventing rotation. However, if the orientation of the bracket 203 and the orientation of the pipe-like member 201 do not match each other, the bolts can be used without being fit neatly. The bracket 203 is forcibly fixed, and an unnecessary force may be applied to the bracket 203.

  Therefore, when the plan to provide the abutment wall of FIG. 7 is adopted in the bracket 103 of the resin duct as shown in FIG. 6, an excessive force is applied to the duct, and the air conditioning performance is deteriorated due to the deformation of the duct. There is a risk of connection.

  Actually, since there is a low probability that the orientation of the bracket 103 provided in the duct of the air conditioner unit and the orientation of the steering member 101 are accurately matched from the beginning, it is securely fixed without difficulty while allowing a slight misalignment. A configuration that can be ideal is ideal.

  For this reason, the condition that the seat surface 104b of the mounting seat 104 of the bracket 103 is brought into contact with the outer peripheral cylindrical surface of the peripheral wall of the steering member 101 with a flat surface without the abutting wall 205 (see FIG. 8) or the like. It is preferable that the duct can be fixed in a stable state while suppressing rotation of the bracket while satisfying.

  The present invention has been made in consideration of the above circumstances, and is a screw of a member that can reliably fix the bracket while suppressing unnecessary rotation and backlash by suppressing the rotation of the bracket at the time of screwing. The purpose is to obtain a stop structure.

  According to the first aspect of the present invention, the flat seating surface (4b) of the bracket (3) of the second member (2) is brought into contact with the outer peripheral cylindrical surface of the peripheral wall of the pipe-shaped first member (1). The bracket (3) is attached to the peripheral wall of the first member (1) with a screw (10) that penetrates the seat surface (4b) and the peripheral cylindrical surface of the peripheral wall of the first member (1). In a fixed member screwing structure, a clearance between the seating surface (4b) of the bracket (3) and the outer peripheral cylindrical surface of the peripheral wall of the first member (1) The protrusion (5, 5B) is provided, and the protrusion (5, 5B) is formed by a tightening force when the screw (10) is screwed into the screw hole (1a) provided in the peripheral wall of the first member (1). ) Is plastically deformed, and the bracket (3) is fixed to the peripheral wall of the first member (1) with a screw (10). And features.

  According to a second aspect of the present invention, a first straight line (L1) passing through the center of the screw hole (1a) and along the axial direction of the first member (1) on the seating surface (4b) of the bracket (3). ) And a second straight line (L2) that passes through the center of the screw hole (1a) and is perpendicular to the first straight line (L1), and sets four regions (A to D), Of the four regions (A to D), one of the two regions (A, C) adjacent to the first straight line (L1) on the near side in the rotational direction accompanying tightening of the screw (10) The protrusions (5, 5B) are arranged so as to be included in the case.

  The invention of claim 3 is a metal circular pipe in which the first member (1) is used as a vehicle structure, and the second member (2) is integrally formed including the bracket (3). It is characterized by being a resin molded product.

  According to the first aspect of the present invention, since the convex portion is provided on the seating surface of the bracket and the convex portion is plastically deformed by screwing the screw, and the bracket is screwed to the peripheral wall of the first member. The friction between the surface and the peripheral wall of the first member can be increased, the adhesion can be improved, and the bracket can be prevented from rotating when the screw is screwed. Therefore, rattling and displacement can be prevented, for example, unnecessary deformation of the first member can be prevented, and workability at the time of screwing can be improved.

  According to the invention of claim 2, since the wedge effect can be obtained by the convex portion when the screw is tightened, the bracket can be more reliably prevented from rotating.

  According to the third aspect of the present invention, the resin-molded protrusions can be crushed to increase the adhesion between the seating surface and the outer peripheral cylindrical surface, thereby more reliably preventing the bracket from rotating and rattling. it can.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view of an embodiment of the present invention, and is a perspective view showing a structure of a portion where a bracket of a duct as a second member is screwed to a steering member as a first member, and FIG. 1 is a cross-sectional view taken along the line II-II in FIG. 1 showing the state in the middle (upper stage) and the state after screw fixing is completed (lower stage), FIG. 3 is a plan view showing the seating surface of the bracket mounting seat, and FIG. FIG. 5 is an explanatory view showing the position of the convex portion provided on the seat surface of the seat, and FIG. 5 is a plan view of the seat surface of the mounting seat of another bracket shown as a modification.

  In the screw fixing structure of the member according to the present embodiment, as shown in FIG. 1, the bracket 3 of the duct 2 as the second member is attached to the outer peripheral cylindrical surface of the peripheral wall of the steering member 1 as the pipe-shaped first member. The flat seating surface 4b of the seat 4 is brought into contact. In this state, the bracket 3 is penetrated to a position where the seating surface 4b of the mounting seat 4 and the outer peripheral cylindrical surface of the peripheral wall of the steering member 1 are in contact with each other. It is fixed to the surrounding wall.

  At this time, as shown in FIGS. 2 and 3, the outer peripheral cylindrical surface of the seat surface 4 b and the peripheral wall of the steering member 1 is previously placed at a position away from the screw through hole 4 a on the seat surface 4 b of the mounting seat 4 of the bracket 3. A rib-like convex portion 5 is provided to fill the gap between the screw 10 and the tip of the screw 10 that is passed through the screw passage hole 4a of the mounting seat 4 is screwed into a screw hole 1a provided on the peripheral wall of the steering member 1. The mounting seat 4 of the bracket 3 is fixed to the peripheral wall of the steering member 1 with screws 10 while the convex portion 5 is plastically deformed by the tightening force.

  At this time, it is preferable that the convex portion 5 is provided so as to be included at least in a region on the back side of the head so that the convex portion 5 can be sandwiched between the head of the screw 10 and the steering member 1.

  Furthermore, in this embodiment, as shown in FIG. 4, on the seat surface 4b of the mounting seat 4, a first straight line L1 passing through the center of the screw hole 1a and along the axial direction of the steering member 1 and the screw hole 1a. The four areas A to D that are divided by the first straight line L1 and the second straight line L2 that pass through the center of the first line L1 are set, and among the four areas A to D, with respect to the first straight line L1 The convex portion 5 is arranged so that at least a part is included in any one of the two regions A and C adjacent to the front side in the rotation direction (arrow X direction in FIG. 4) when the screw 10 is tightened. .

  In addition, the steering member 1 is a structure provided in the vehicle to allow the steering shaft to pass through, and is configured by a metal circular pipe. Further, the duct 2 constitutes an air passage of the air conditioner unit, and the entire structure including the bracket 3 is composed of an integrally molded product of resin.

  According to the present embodiment described above, the rib-like convex portion 5 is provided on the seating surface 4b of the mounting seat 4 of the bracket 3, and the bracket 3 is attached to the steering member 1 while the convex portion 5 is plastically deformed by screwing the screw 10. Since the resin (rib-shaped convex portion 5) is crushed, the friction between the seating surface 4b of the mounting seat 4 of the bracket 3 and the peripheral wall of the steering member 1 can be increased. The adhesion between the mounting seat 4 and the steering member 1 can be improved, and the bracket 3 can be prevented from rotating when the screw 10 is screwed. Therefore, it is possible to prevent rattling or displacement of the mounting portion of the bracket 3, for example, it is possible to prevent unnecessary deformation of the duct 2 and to improve workability at the time of screwing. it can.

  In particular, since the position of the convex portion 5 is set in a region adjacent to the front side in the rotational direction accompanying tightening of the screw 10, the wedge effect by the convex portion 5 can be obtained, and the rotation of the bracket 3 can be prevented more reliably. be able to.

  In addition, as in the example shown in FIG. 5, a longer rib-like convex portion 5 </ b> B extending over the two regions C and D shown in FIG. 4 may be formed on the seating surface 4 b of the mounting seat 4. Good.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

It is explanatory drawing of the screwing structure of the member concerning embodiment of this invention, Comprising: The perspective view which shows the structure of the part which screws the bracket of the duct which is the 2nd member to the steering member which is the 1st member. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, wherein (upper) shows a state during screwing, and (lower) shows a state after screwing is completed. The top view which shows the seat surface of the attachment seat of the bracket of the screwing structure of the member concerning embodiment of this invention. The figure which shows the position of the convex part provided in the seat surface of the attachment seat of the screwing structure of the member concerning embodiment of this invention. The top view of the seat surface of the attachment seat of the bracket of the screwing structure of the member concerning the modification of embodiment of this invention. It is a figure which shows an example of the conventional screw stop structure. It is a figure which shows the example of the other conventional bolting structure.

Explanation of symbols

1 Steering member (first member)
1a Screw hole 2 Duct (second member)
3 Bracket 4b Seat 5,5B Protrusion 10 Screw L1 First straight line L2 Second straight line A to D Four regions

Claims (3)

The flat seating surface (4b) of the bracket (3) of the second member (2) is brought into contact with the outer peripheral cylindrical surface of the peripheral wall of the pipe-shaped first member (1), and the bracket (3) is put in this state. The member is formed by fixing the peripheral surface of the first member (1) with a screw (10) that penetrates the seating surface (4b) and the peripheral cylindrical surface of the peripheral wall of the first member (1). In screw fixing structure,
Protruding portions (5, 5B) are provided on the seating surface (4b) of the bracket (3) to fill a gap between the seating surface (4b) and the outer peripheral cylindrical surface of the peripheral wall of the first member (1), While the screw (10) is screwed into a screw hole (1a) provided in the peripheral wall of the first member (1), the bracket (3) Is fixed to the peripheral wall of the first member (1) with a screw (10).   On the seat surface (4b) of the bracket (3), a first straight line (L1) passing through the center of the screw hole (1a) and along the axial direction of the first member (1), and the screw hole ( Four areas (A to D) divided by a second straight line (L2) passing through the center of 1a) and perpendicular to the first straight line (L1) are set, and the four areas (A to D) are set. D), the first straight line (L1) is included in any one of two regions (A, C) adjacent to the front side in the rotational direction accompanying tightening of the screw (10). The screw fixing structure for a member according to claim 1, wherein convex portions (5, 5B) are arranged.   The first member (1) is a metal circular pipe used as a vehicle structure, and the second member (2) is a resin molded product integrally formed including the bracket (3). 3. The screw fixing structure for a member according to claim 1 or 2, wherein:

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