JP4081961B2 - Accelerometer mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for mounting an acceleration sensor that detects an impact (acceleration) applied to a vehicle body, for example, to activate an air bag of an automobile, to a mounted site such as the vehicle body.
[0002]
[Prior art]
An automobile airbag operates when an impact (acceleration) in a certain direction exceeds a predetermined value, and an acceleration sensor (semiconductor acceleration sensor) using a semiconductor is generally used for detecting the acceleration. Such an acceleration sensor for impact detection is firmly attached to the vehicle body in the engine room or inside the instrument panel in order to accurately detect the acceleration at the time of collision and to prevent any malfunction. .
[0003]
Conventionally, as shown in FIG. 11, a mounting portion 21 is provided on the bottom surface of a housing 20 that houses the acceleration sensor, and a bracket (mounting bracket) 30 as shown in FIG. 12 is attached to the mounting portion 21. By fixing to the acceleration sensor, the acceleration sensor can be firmly attached to the vehicle body. The mounting portion 21 has a cross-sectional shape having a support piece 21a projecting from the bottom surface of the synthetic resin housing 20, and a main piece 21b extending substantially parallel to the bottom surface of the housing 20 from the front end portion of the support piece 21a. A pair of main pieces 21b are provided so as to face each other with a predetermined interval. A locking claw 21c projects from the side surface of each support piece 21a on the side where the main piece 21b extends. Further, a substantially dome-shaped protrusion 22 is projected from a portion sandwiched between the two main pieces 21 b on the bottom surface of the housing 20.
[0004]
On the other hand, the bracket 30 is a workpiece of a metal plate and has a fixing portion (not shown) that is fixed to a vehicle body of a car using screws or the like. As shown in FIG. 12, a press-fitting piece 31 that is press-fitted into a groove 23 formed between the bottom surface of the housing 20 and the main piece 21 b of the mounting portion 21 is formed at the main point of the bracket 30. In addition, the press-fitting piece 31 is formed with a notch 32 where the front end corner is cut obliquely and the engaging claw 21c of the mounting portion 21 is engaged on both sides along the press-fitting direction, and is further approximately at the center. Is provided with a fitting hole 33 into which the protrusion 22 protruding from the bottom surface of the housing 20 is fitted.
[0005]
Thus, when the press-fitting piece 31 of the bracket 30 is press-fitted into the groove 23 of the housing 20, the locking claw 21 c protruding from the support piece 21 a of the mounting portion 21 is notched in the press-fitting piece 31 as shown in FIG. 13. 32, and the protrusion 22 on the bottom surface of the housing 20 is fitted into the fitting hole 33 of the press-fitting piece 31 so that the bracket 30 is attached to the attachment portion 21 of the acceleration sensor.
[0006]
[Problems to be solved by the invention]
However, in the above conventional mounting structure, the locking claw 21c cannot be seen hidden behind the main piece 21b of the mounting portion 21, and is locked when the press-fitting piece 31 is press-fitted into the groove 23 as shown in FIG. It is difficult to verify whether or not the claw 21c is securely engaged with the notch 32 of the bracket 30, and the engagement between the locking claw 21c and the notch 32 and the fitting with the projection 22 are difficult. In the fitting with the hole 33, there is a possibility that rattling or loosening may occur during use.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an acceleration sensor mounting structure in which the mounting state can be easily verified and rattling and loosening are unlikely to occur during use. is there.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is an attachment structure for attaching an acceleration sensor to a portion to be attached, wherein a pair of insertion grooves are formed between the housing and the bottom surface of the housing for accommodating the acceleration sensor. A mounting part is provided, and a pair of insertion pieces to be inserted into the respective insertion grooves are provided at the main points of the bracket fixed to the attachment site, and the caulking pieces that are caulked to the attachment part side after being inserted into the insertion groove are inserted. In the mounting structure of the acceleration sensor, which is provided on the piece and is visible from the outside with at least the insertion piece inserted into the insertion groove, the attachment portion is formed in a rectangular plate shape in plan view protruding from the bottom surface of the housing. And a pair of projecting pieces in a plan view rectangular plate projecting substantially parallel to the bottom surface of the housing from both side edges of the support platform, and each of the above-mentioned between the projecting pieces and the bottom surface of the housing. An insertion groove is formed, and the bracket has a pair of the insertion pieces that are spaced apart from each other in a direction orthogonal to the insertion direction into the insertion groove. A caulking piece that erected the outer part along the insertion direction is provided, and the distance between the pair of caulking pieces is from the edge of one protruding piece to the edge of the other protruding piece in the direction perpendicular to the inserting direction. In the insertion groove formed between the pair of protruding pieces and the bottom surface of the housing, each insertion piece of the bracket is inserted in parallel with the bottom surface of the housing. Once inserted, the caulking pieces protrude from the insertion groove along the insertion direction, and the caulking pieces are caulked and fixed by caulking pieces by caulking these caulking pieces to the attachment side. Thickness By caulking in the direction, rattling and loosening can be prevented more reliably, and each caulking piece protrudes from the insertion groove through the side edge along the insertion direction of the protruding piece. Even after the insertion, the caulking piece can be visually recognized, and even if an attachment failure occurs due to insufficient caulking of the caulking piece, the attachment failure can be easily found and verified.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an acceleration sensor mounting structure according to the present invention will be described below in detail with reference to the drawings.
[0010]
FIG. 2 shows a housing 1 in which an acceleration sensor (semiconductor acceleration sensor) not shown is accommodated. A housing 1 made of a synthetic resin molded product is formed in a box shape with an opening on one side, and a mounting portion 2 is provided on an outer bottom surface (hereinafter simply referred to as “bottom surface”). The mounting portion 2 has a rectangular plate-like support base 2a that protrudes from substantially the center of the bottom surface of the housing 1, and a rectangular plate-like support plate that protrudes substantially parallel to the bottom surface of the housing 1 from both side edges of the support base 2a. A pair of protruding pieces 2b are formed integrally with the housing 1, and insertion grooves 3 are formed between the protruding pieces 2b and the bottom surface of the housing 1, respectively. That is, the attachment portion 2 is substantially T-shaped when viewed from the insertion direction (see FIG. 2C).
[0011]
On the other hand, the bracket 10 to which the housing 1 is attached is a workpiece of a metal plate, and has a fixing portion that is fixed to the vehicle body of an automobile using screws or the like. As shown in FIG. 3, a pair of insertion pieces 11 to be inserted into the insertion grooves 3 are projected from the main points of the bracket 10. The insertion piece 11 is formed integrally with the bracket 10 at a distance from each other in the direction orthogonal to the insertion direction into the insertion groove 3, and the caulking piece 12 is formed by raising an outer portion in the opposite direction along the insertion direction. Is provided. Here, the interval between the two caulking pieces 12 is set to a dimension substantially equal to the distance from the edge of one protruding piece 2b to the edge of the other protruding piece 2b in the direction orthogonal to the insertion direction.
[0012]
Thus, if the insertion piece 11 of the bracket 10 is inserted into the insertion groove 3 formed between the protruding piece 2b and the bottom surface of the housing 1 from the direction of the arrow shown in FIG. The support 2a of the mounting portion 2 is fitted between the two insertion pieces 11, and each caulking piece 12 protrudes from the insertion groove 3 through the side edge along the insertion direction of each protrusion piece 2b. Then, by caulking the caulking piece 12 toward the attachment portion 2, the attachment portion 2 and the insertion piece 11 are caulked and fixed by the caulking piece 12 as shown in FIG. 1, and the bracket 10 is attached to the attachment portion 2 of the housing 1. Complete. By caulking the caulking piece 12 in the thickness direction of the insertion piece 11 as described above, the caulking piece 12 can be securely attached so that no rattling or loosening occurs. Moreover, since each caulking piece 12 protrudes from the insertion groove 3 through the side edge along the insertion direction of the protruding piece 2b, the caulking piece 12 can be visually recognized even after the insertion piece 11 is inserted into the insertion groove 3. In the unlikely event that an attachment failure occurs due to insufficient caulking of the caulking piece 12 or the like, it is possible to easily detect and verify the attachment failure.
[0013]
Next, a modified example of the present invention will be described.
FIG. 4 shows the housing 1 in this modification. The mounting portion 4 provided on the bottom surface of the housing 1 has a cross-sectional shape having a support piece 4a projecting from the bottom surface of the housing 1 and a main piece 4b extending substantially parallel to the bottom surface of the housing 1 from the front end portion of the support piece 4a. A pair of main pieces 4b are provided so as to face each other with a predetermined interval.
[0014]
On the other hand, as shown in FIG. 5, an insertion piece 13 that is inserted into the insertion groove 5 formed between each main piece 4 b and the bottom surface of the housing 1 is protruded from the main part of the bracket 10. The insertion piece 13 is formed to be narrower than the other part of the bracket 10, and caulking pieces 14 are projected from both corners of the tip which are cut obliquely. As shown in FIG. 6, the caulking piece 14 is formed integrally with the insertion piece 13 so that a coupling portion 14 a with the insertion piece 13 is narrower than other portions. Here, the interval between the two caulking pieces 14 is set to a dimension approximately equal to the distance between the insertion grooves 5 of each attachment portion 4.
[0015]
Thus, if each of the insertion pieces 13 of the bracket 10 is inserted into the insertion groove 5 formed between the main piece 4b and the bottom surface of the housing 1 from the direction of the arrow shown in FIG. Each caulking piece 14 protrudes from the insertion groove 5 through the leading edge of the main piece 4b in the insertion direction. Then, by caulking the caulking piece 14 toward the mounting portion 4 (outside), the mounting portion 4 and the insertion piece 13 are caulked and fixed by the caulking piece 14 as shown in FIG. Installation is complete. In the present modification, the caulking piece 14 is caulked in the insertion direction of the insertion piece 13, but after caulking, the thickness of the outer portion (the hatched portion in FIG. 6) of the coupling portion 14 a of the caulking piece 14 increases. The insertion piece 13 can be securely attached so that no looseness or looseness occurs in both the insertion direction of the insertion piece 13 and the thickness direction of the insertion piece 13. Further, since the caulking piece 14 protrudes from the insertion groove 5, the caulking piece 14 can be visually recognized even after the insertion piece 13 is inserted into the insertion groove 5, and the caulking piece 14 is caulked by any chance. Even when a mounting failure occurs due to a shortage or the like, the mounting failure can be easily found and verified.
[0016]
Here, together with the rear side of the insertion direction at a site opposing the mounting portion 4 of the insert piece 13 is provided with a protrusion claw 15 was raised, and the groove 6 notched portion corresponding to the protrusion claw 15 of the mounting portion 4 provided in Reference Example Is shown in FIG. 8 and FIG. However, the basic configuration of the present embodiment is because it is common and modifications described above, the configuration common to omit the description the same reference numerals.
[0017]
As shown in FIG. 9, a pair of protruding claws 15 are provided by projecting the rear portion of the insertion piece 13 of the bracket 10. Further, as shown in FIG. 8, the main piece 4b of the mounting portion 4 is provided with a notch groove 6 in which a portion corresponding to the protruding claw 15 is notched into a substantially rectangular shape.
[0018]
Thus, as in the modification, the insertion piece 13 of the bracket 10 is inserted into the insertion groove 5 formed between the main piece 4b and the bottom surface of the housing 1 from the direction of the arrow shown in FIG. If each is inserted, each caulking piece 14 protrudes from the insertion groove 5 through the leading edge of each main piece 4b in the insertion direction, and the projection claw 15 of the insertion piece 13 enters the notch groove 6 of the mounting portion 4 (main piece 4b). Engage. Then, the caulking piece 14 is caulked to the mounting portion 4 side (outside), whereby the mounting portion 4 and the insertion piece 13 are caulked and fixed by the caulking piece 14 as shown in FIG. Installation is complete. Since the projection claw 15 provided on the insertion piece 13 is engaged with the notch groove 6 of the mounting portion 4 in this way, even if the caulking piece 14 is removed and the housing 1 and the bracket 10 are to be disassembled, the projection claw 15 is provided. When the engagement between the claw 15 and the cutout groove 6 is released, the protruding claw 15 destroys the cutout groove 6. As a result, it is possible to prevent the housing 1 once disassembled from being reused and to easily disassemble the housing 1 and the bracket 10 since the notch groove 6 is broken even if the housing 1 is reused. Has the advantage of knowing.
[0019]
【The invention's effect】
The invention according to claim 1 is an attachment structure for attaching the acceleration sensor to the attachment site, wherein the housing for accommodating the acceleration sensor is provided with an attachment portion for forming a pair of insertion grooves with the bottom surface of the housing. A pair of insertion pieces to be inserted into the respective insertion grooves are provided at the main points of the brackets fixed to the parts, and caulking pieces that are caulked to the mounting portion side after being inserted into the insertion grooves are provided on the respective insertion pieces. In the acceleration sensor mounting structure in which at least the insertion piece is inserted into the insertion groove and visible from the outside, the mounting portion includes a rectangular plate-shaped support base projecting from the bottom surface of the housing, and both sides of the support base A pair of projecting pieces in the shape of a rectangular plate in plan view projecting substantially parallel to the bottom surface of the housing from the edge, and the insertion grooves are formed between the projecting pieces and the bottom surface of the housing. The pad has a pair of the insertion pieces that are spaced apart from each other in a direction orthogonal to the insertion direction into the insertion groove, and the pair of insertion pieces has an outer portion in the opposite direction in the insertion direction. A caulking piece that is raised along the length is provided, and the distance between the pair of caulking pieces is approximately equal to the distance from the edge of one protruding piece to the edge of the other protruding piece in the direction orthogonal to the insertion direction. Therefore, if each insertion piece of the bracket is inserted in parallel with the bottom surface of the housing into the insertion groove formed between the pair of projecting pieces and the bottom surface of the housing, the caulking pieces are inserted in the insertion direction. The caulking pieces are caulked and fixed by caulking pieces by caulking these caulking pieces to the attaching part side, and the caulking pieces are caulked in the thickness direction of the inserting pieces, Loose Furthermore, since each caulking piece protrudes from the insertion groove through the side edge along the insertion direction of the protruding piece, the caulking piece can be visually recognized even after the insertion piece is inserted into the insertion groove. Even if a mounting failure occurs due to a lack of caulking of the caulking piece, it is possible to easily detect and verify the mounting failure.
[Brief description of the drawings]
1 is a plan view showing an essential part of the embodiment.
2A is a plan view of the bottom surface side, FIG. 2B is a side cross-sectional view with a part omitted, and FIG. 2C is a side view with a part omitted from another direction. .
FIGS. 3A and 3B show the brackets of the above, in which FIG. 3A is a partially omitted plan view, and FIG. 3B is a partially omitted side sectional view;
4A and 4B show a housing according to a modification of the present invention, in which FIG. 4A is a plan view of the bottom surface side, and FIG.
5A and 5B show the brackets of the above, wherein FIG. 5A is a partially omitted plan view and FIG. 5B is a partially omitted side sectional view.
FIG. 6 is a plan view of a principal part of the bracket in the same as above.
FIG. 7 is a plan view showing the main part of the above.
8A and 8B show a housing according to a reference example of the present invention, in which FIG. 8A is a plan view of the bottom surface side, and FIG.
9A and 9B show the bracket of the above, wherein FIG. 9A is a partially omitted plan view, and FIG. 9B is a partially omitted side sectional view.
FIG. 10 is a plan view of a principal part of the bracket in the same as above.
11A and 11B show a housing in a conventional example, in which FIG. 11A is a plan view of the bottom surface side, and FIG.
12A and 12B show the bracket of the above, wherein FIG. 12A is a plan view with a part omitted, and FIG. 12B is a side sectional view with a part omitted.
FIG. 13 is a plan view of the main part of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Mounting part 3 Insertion groove 10 Bracket 11 Insertion piece 12 Caulking piece

Claims (1)

An attachment structure for attaching an acceleration sensor to an attachment site, wherein a housing for accommodating the acceleration sensor is provided with an attachment portion that forms a pair of insertion grooves between the housing bottom surface and a bracket fixed to the attachment site. A pair of insertion pieces to be inserted into the respective insertion grooves are provided at important points, and caulking pieces that are caulked to the mounting portion side after being inserted into the insertion grooves are provided on the respective insertion pieces, and at least the insertion pieces are inserted into the insertion grooves. In the acceleration sensor mounting structure that is visible from the outside in the inserted state, the mounting portion includes a rectangular plate-shaped support base that projects from the bottom surface of the housing, and is substantially parallel to the housing bottom surface from both side edges of the support base. A pair of projecting pieces having a rectangular plate shape in plan view, and the insertion grooves are formed between the projecting pieces and the bottom surface of the housing. A pair of insertion pieces provided at a distance from each other in a direction orthogonal to the insertion direction, and the pair of insertion pieces are caulking pieces that are raised along the insertion direction on the outer side in the opposite direction. Provided, and the distance between the pair of caulking pieces is set to a dimension approximately equal to the distance from the edge of one protruding piece to the edge of the other protruding piece in a direction orthogonal to the insertion direction. Mounting structure of acceleration sensor .

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