Crack-preventive screw-fastening structure for resinous housing
AssigneeDenso Corporation
InventorYasuhiro Suzuki
Life of this patent
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Abstract
An adhesive is applied to a male-threaded portion of a tapping screw. The male-threaded portion with the adhesive is threadably engaged with a non-threaded through hole of the full-closed stopper with female-threads being formed on the surface of the though hole. In this case, the adhesive functions as lubricant between the inner surface of the through hole and the male-threaded portion. Accordingly, the male-threaded portion can be screwed into the through hole with a low torque and without applying high load to the full-close stopper. Therefore, the full-close stopper is prevented from being projected around the inlet and the outlet of the through hole, and the full-close stopper is prevented from being cracked.
Claims15
A screw fastening structure comprising:
- a screw having a male-threaded portion and a screw head, which is positioned at an end of the screw in opposition to an engaging side of the screw;
- and
- a housing including a resinous portion to be threadably engaged with the male-threaded portion;
- and
- an adhesive permeating between the male-threaded portion and the resinous portion, wherein;
- the resinous portion has a round through hole for guiding the male-threaded portion to be engaged therewith, said through hole extending completely through said resinous portion;
- the resinous portion has a clearance inlet hole defined therein around an inlet of and concentrically with the through hole;
- and
- an inner diameter of the clearance inlet hole is larger than an outer diameter of the male-threaded portion.
A screw fastening structure comprising:
- a screw having a male-threaded portion and a screw head, which is positioned at an end of the screw in opposition to an engaging side of the screw;
- a housing including a resinous portion having a through hole to be threadably engaged with the male-threaded;
- and
- an adhesive permeating between the male-threaded portion and the resinous portion, wherein the length of the male-threaded portion is shorter than the length of the resinous portion through hole so that the male-threaded portion does not project from the outlet of the resinous portion through hole when engaged therewith.
A screw fastening structure comprising:
- a screw having a male-threaded portion;
- a housing including a resinous portion to be threadably engaged with the male-threaded portion;
- and
- an adhesive permeating between the male-threaded portion and the resinous portion, wherein the resinous portion has a round through hole for guiding the male-threaded portion to be engaged therewith, said through hole extending completely through said resinous portion, and the resinous portion has a clearance portion defined therein around an outlet of and concentrically with the resinous portion through hole.
A screw fastening structure comprising:
- a screw having a male-threaded portion;
- a housing including a resinous portion to be threadably engaged with the male-threaded portion;
- and
- an adhesive permeating between the male-threaded portion and the resinous portion, wherein the housing is a throttle housing, which is used for a throttle valve system and has a bore portion in which a throttle valve is rotatably installed;
- the resinous portion is a boss-shaped portion that projects from an outer wall of the throttle housing;
- and
- the screw is a tapping screw for controlling one of an opened degree and a closed degree of the throttle valve.
A screw fastening structure comprising:
- a screw having a male-threaded portion;
- a housing including a resinous portion to be threadably engaged with the male-threaded portion;
- and
- an adhesive permeating between the male-threaded portion and the resinous portion, wherein:
- the housing is a throttle housing, which is used for a throttle valve system and has a bore portion in which a throttle valve is rotatably installed;
- the resinous portion is a boss-shaped portion that projects from an outer wall of the throttle housing;
- and
- the screw is a fastening screw for fastening an attachment member, having a through hole, to the boss-shaped portion.
A screw fastening structure comprising:
- a screw having a male-threaded portion;
- a housing including a resinous portion to be threadably engaged with the male-threaded portion;
- and
- an adhesive permeating between the male-threaded portion and the resinous portion, wherein the male-threaded portion has a non-circular shape in its cross-section that is perpendicular to an axial, screw advancing direction of the male-threaded portion, wherein the male-threaded portion has a non-circular shape in plan view.
Dependencies are inferred from the claim text.