JP2007331544A - Mounting structure of acceleration detection sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of an acceleration detection sensor improved in fastening work efficiency at a low cost. <P>SOLUTION: The structure for mounting the acceleration detection sensor 4 with ribs 22a and 22b on a mounting member 27a is so formed that one end side of a fixing member 6 which penetrates through-holes formed in the acceleration detection sensor 4 and the mounting member 27a respectively is prevented from being pulled out by a stop part 7, at least one recess portion is engaged with the rib, the other end side of the fixing member 6 is formed into a screw and threadedly engaged with a thread-engagement member 11, and the acceleration detection sensor 4 and the mounting member 27a are clamped by the stop part 7, a stop ring 8 and the thread-engagement member 11 so as to be integrally retained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure for mounting an acceleration detection sensor in a vehicle or the like.

  Conventionally, when a sensor is attached to a mounting member, a bolt is inserted into a part of the sensor in advance, and a retaining portion (E-ring) is attached to a screw portion of the bolt as a means for retaining the bolt, There is a technique for screwing the bolt into a locking hole (screw hole) formed in the mounting member (see, for example, Patent Document 1).

  In this prior art, the bolts that have passed through the sensor bushing are prevented from slipping out of the bushing during the working process due to the function of the retaining portion. Such a conventional technique is applicable to, for example, mounting a sensor on the surface side of a mounting member (an inner wall plate of a vehicle compartment). At the time of attachment, a female screw is formed in advance on the back surface side of the attachment member, and a bolt through which a part of the sensor is inserted is screwed into the female screw from the front side and fixed. However, in this method, the sensor may protrude from the front side of the mounting member (inside the passenger compartment), which may not be preferable in terms of layout.

  In order to avoid the mounting state where the sensor protrudes to the front side of the mounting member in this way, the sensor may be mounted on the back side of the mounting member. For this purpose, an opening large enough to pass the hand holding the sensor is formed in the mounting member in advance, and the operator takes the sensor from the front side of the mounting member through the opening to the back side of the mounting member. A method of bolting a screw hole formed on the front side of the attachment member is conceivable.

Here, since the back side of the mounting member, for example, the back side of the vehicle interior wall board, is a narrow space that can finally be entered by a human hand, bolting is a groping work, and the operation of operating the tightening tool in the narrow space With considerable difficulty.
In order to facilitate the screw tightening work from the vehicle interior side, a through hole through which the bolt penetrates is formed in the vehicle interior wall plate, and the worker in the vehicle interior holds the sensor body through which the bolt is inserted, It is also conceivable to insert the screw into the above-mentioned opening and bring it into the back side of the vehicle interior wall plate, pass the threaded portion of the bolt through the through-hole and project it into the vehicle interior, and screw the nut into the projecting male screw.

  However, when a rotational force for screw tightening is applied to the nut, the bolts on the vehicle interior wall plate side may rotate together, preventing screw tightening. When working alone, it is practically difficult to hold the tightening tool with one hand, hold the sensor with the other hand, and hold it so that the bolt does not rotate.

JP 2001-174471 A

As described above, the sensor is generally fixed with bolts from the front side (vehicle interior) of the vehicle frame, but due to vehicle layout constraints, it is placed on the back side of the frame (vehicle interior wall plate) and tightened only from the front side. In such a case, a work is put on the back side of the frame, the bolt head is held with a spanner or the like, and the rotation is stopped, which causes a problem in work efficiency.
As a countermeasure, it may be possible to manufacture a dedicated housing in which a bolt is insert-molded in the sensor housing, but the mold cost is high for a product with a small production scale.
Thus, conventionally, the mounting of the sensor has a problem of improving workability while suppressing the cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an acceleration detection sensor mounting structure that improves the workability of tightening at a low cost.

  The mounting structure of the acceleration detection sensor according to the present invention includes an insertion hole formed in the mounting surface and the mounting member of the acceleration detection sensor, a fixing member inserted through the insertion hole, and an insertion hole formed on one end side of the fixing member. A screw formed on the other end side of the fixing member having a large plate plate and a non-rotating concave / convex engaging portion of the fixing member formed relatively to the peripheral surface of the plate plate and the facing surface of the mounting member The acceleration detecting sensor is fixed to the mounting member by screwing the screwing member into the portion.

  According to the present invention, since the concave portion of the fixing member is engaged with the rib of the acceleration detection sensor and is prevented from rotating, the operator is released from the work burden required to prevent rotation and the workability of tightening is greatly improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
(Configuration of acceleration sensor)
FIG. 1 is a perspective view showing the appearance of a standard acceleration detection sensor 4. In FIG. 1, a connector 23 for guiding the detection output of the sensor to the control unit protrudes from a part of the acceleration detection sensor 4. FIG. 2 shows the overall shape of the acceleration detection sensor 4 rotated about 180 degrees clockwise about the axis OO of the connector 23. FIG. 3 shows a state in which the acceleration detection sensor 4 shown in FIG. 1 is viewed from the right side of FIG. FIG. 4 shows the left side of the acceleration detection sensor 4 shown in FIG.

The characteristics of the shape of the acceleration detection sensor 4 according to the present invention will be described with reference to FIGS.
The acceleration detection sensor 4 encloses a sensor element in the housing 2. Since the housing 2 is manufactured by resin molding, the material is selected so as to satisfy the function, and the housing 2 is designed in consideration of the thinness and the uniform thickness as much as possible. The acceleration detection sensor 4 has a function of detecting acceleration generated at the time of a vehicle collision or the like, and a signal from a sensor element built in the housing 4 is sent to the control unit via the vehicle wiring connected to the connector 23. It is supposed to be.

  In the acceleration detection sensor 4, the housing 2 and the plate-shaped fixing portion 21 constitute a substantially L-shaped basic shape portion, and both side portions of the basic shape portion are reinforced with trapezoidal plate-shaped reinforcing portions 25a and 25b. It is formed in a three-dimensional shape. Further, the connector 23 protrudes outward from the reinforcing portion 25b. Inside the connector 23, terminals for electrical connection with the control unit are provided. The housing 2, the fixing portion 21, the reinforcing portions 25a and 25b, and the connector 23 are formed by integral molding with resin.

  The resonance characteristic of the housing 2 itself greatly affects the acceleration detection performance of the sensor element. Therefore, a reinforcing rib is formed in the housing 2 to suppress the resonance. The rib is formed in a part of the housing 2 and facing the fixed portion 21. Two parallel ribs 22a, 22b and ribs 22c, 22d, 22e orthogonal to these ribs 22a, 22b are formed. The rib 22d is located between the ribs 22a and 22b and has a concave curved shape.

  A metal bush 3 is integrated in a substantially central portion of the fixed portion 21 by insert molding or outsert. The inner diameter portion of the bush 3 constitutes an insertion hole that penetrates the fixed portion 21. As shown in FIG. 2 and FIG. 3, a circular seat 26 is formed on a part of the fixed part 21 opposite to the side facing the housing 2. The end of the bush 3 is located on the seat portion 26. The pin 24 stands upright adjacent to the seat portion 26. The axial direction XX of the bush 3 and the central axis YY of the pin 24 are parallel. The tip of the pin 24 is chamfered in a tapered shape so that it can be easily inserted into the mounting member of the acceleration detection sensor.

  As shown in FIG. 4, the ribs 22 a and 22 b are formed such that the longitudinal direction thereof is parallel to the central axis XX of the bush 3. When the two ribs 22a and 22b are viewed from the front, the longitudinal direction of the ribs 22a and 22b is parallel to the central axis XX, and the ribs 22a and 22b are equally divided with respect to the central axis XX. ing. That is, the ribs 22a and 22b are line-symmetric with respect to a virtual straight line drawn on the housing 2 parallel to the central axis XX of the bush 3 (a line that coincides with the central axis XX in FIG. 4). It is configured.

(Fixing member for acceleration detection sensor)
A fixing member that fixes the acceleration detection sensor 4 to the attachment target member will be described.
In FIG. 5, the fixing member 10 includes an assembly bolt 9 in which a plate 7 is integrated with a bolt head, and a retaining ring 8 as a fixing piece that is inserted into the male screw 6 of the assembly bolt 9 and is prevented from coming off. , 11 is a nut 11 as a screwing member screwed into the male screw 6. The inner diameter of the bush 3 is formed larger than the outer diameter of the male screw 6 so that the male screw 6 can be inserted. As shown in FIG. 6, the plate 7 is integrated with the head of the male screw by welding. When the male screw 6 is inserted into the bush 3, the plate 7 engages with the ribs 22 a and 22 b and rotates. Concave portions 7a and 7b exhibiting a stopping function are provided. The concave portion 7 a and the concave portion 7 b are configured to be line-symmetric on the plate 7 with the central axis ZZ of the assembly bolt 9 and the straight line Z 1 -Z 1 perpendicular to the plate 7 as the symmetry axis.

  Since the size of the plate 7 is larger than the insertion hole formed in the bush 3, when the male screw 6 is inserted into the bush 3, the plate 7 functions as a stop and cannot be pulled out in the insertion direction. Between the recessed part 7a and the recessed part 7b, the curved shape part 7c along the rib 22d is comprised. The same configuration as the recesses 7a and 7b and the curved shape portion 7c (recesses 7a 'and 7b' and the curved shape portion 7c ') is a rotationally symmetric position of 180 degrees with the central axis ZZ of the assembled bolt 9 as the symmetry axis. There is also.

  The retaining ring 8 has about 3 to 4 claws 8 a, and the circular diameter connecting the free ends of these claws 8 a is large enough to engage with the male screw 6. Therefore, when the retaining ring 8 is inserted into the free end of the male screw 6 and then pushed in using a cylindrical jig, the retaining ring 8 is latched and held by the screw thread at the pushed position. It is held in a state where it is prevented from coming off at the position. The nut 11 has a female screw that is screwed with the male screw 6, and has a seat portion 11a.

(Acceleration sensor installation procedure)
A procedure for attaching the acceleration detection sensor 4 using the fixing member 10 and the screwing member 11 will be described.
In order to attach the acceleration detection sensor 4 to an attachment member that is an attachment target member, the assembly bolt 9 is assembled to the acceleration detection sensor 4 in advance.
This pre-assembly procedure will be described.
The male screw 6 of the assembly bolt 9 is inserted into the inner diameter portion of the bush 3 from the side where the ribs 22a and 22b are formed in the acceleration detection sensor 4 shown in FIGS. In the process of insertion, the recesses 7a and 7b of the plate 7 come into engagement with the ribs 22a and 22b, and the plate 7 comes into contact with the fixed portion 21 and stops by further pressing. In this state, the recesses 7a and 7b engage with the ribs 22a and 22b, and the male thread portion of the assembly bolt 9 passes through the bush 3 and protrudes to the opposite side of the fixing portion 21 as shown in FIG.

  In FIG. 7, the retaining ring 8 is pushed into the male screw 6 with the head of the assembly bolt 9 received by an appropriate means such as a jig. A cylindrical jig is used for this operation. As shown in FIG. 8, the assembling bolt 9 sandwiches the plate-shaped fixing portion 21 between the head and the retaining ring 8 and is fixed to the fixing portion 21 in this sandwiched state. In this state, as shown in FIG. 9, the recesses 7a and 7b are engaged with the ribs 22a and 22b, respectively. Further, the curved shape portion 7c and the rib 22d are in a state of not interfering with each other. Thus, the assembly bolt 9 is prevented from being detached from the acceleration detection sensor 4 by the retaining ring 8 and is prevented from rotating, so that the assembly bolt 9 does not fall off from the acceleration sensor 4 or does not worry about co-rotation. In subsequent operations, the nut 11 can be used to easily attach to the attachment target. Since the retaining ring 8 is made of metal, it does not deform like a resin when tightened, and the tightening does not become loose.

  In this example, the acceleration detection sensor 4 is attached to a side pillar of an automobile. In FIG. 10, the side pillar 27 includes an inner panel 27a and an outer panel 27b as shown in FIG. The inner panel 27a is bent in a concave shape and forms a space in which the acceleration detection sensor 4 can be accommodated between the inner panel 27a and the outer panel 27b. An opening 28 is formed in the inner panel 27a in advance. The opening 28 is large enough to allow one hand of an operator who has grasped the acceleration detection sensor 4 to pass through. In FIG. 10, the upper portion of the opening 28 is the mounting position of the acceleration detection sensor 4, and the inner panel 27a has an insertion hole 30 through which the male screw 6 can be inserted and a pin hole 31 into which the pin 24 can be fitted in advance. Is formed.

  When assembling, as shown in FIG. 10, the acceleration detection sensor 4 to which the assembly bolt 9 is attached and which is prevented from being removed by the retaining ring 8 is held in one hand, and the acceleration detection sensor is placed inside the inner panel 27a through the opening 28. 4 is inserted, the male screw 6 is inserted into the insertion hole 30, and protrudes to the front side of the inner panel 27a (inside the passenger compartment). At the same time, the pin 24 is fitted into the pin hole 30. By this fitting, the acceleration detection sensor 4 is prevented from rotating with respect to the inner panel 27a. Therefore, the pin 24 and the pin hole 31 constitute a detent means for the acceleration detection sensor 4 and the inner panel (attachment member) 27a.

  Next, the nut 11 is screwed into the male screw 6 with the other hand while the acceleration detection sensor 4 is pressed toward the front side (inside of the passenger compartment) of the inner panel 27a with the hand inserted into the opening 28. The male screw 6 is screwed and tightened by an appropriate means such as an electric device. In this screwing process, the acceleration detection sensor 4 does not rotate together because the pin 24 is fitted in the pin hole 31, and the recesses 7a and 7b are engaged with the ribs 22a and 22b, respectively. The assembly bolt 9 does not rotate in the process of tightening the nut 11, and the acceleration detection sensor 4 can be efficiently attached to the side pillar 27. Since the retaining ring 8 is made of metal, it does not need to be removed when the acceleration detection sensor 4 is attached to the attachment target member, and can be fastened together. The acceleration detection sensor 4 thus fixed to the inner panel 27a is shown in FIG. Even if the ribs 22a and 22b are formed as concave portions and the concave portions 7a and 7b are formed as convex portions, the same effects as described above can be obtained.

  When the retaining ring 8 is not used, the assembly bolt 9 has a function of preventing rotation due to the engagement between the recess and the rib. However, when tightening the nut 11, the operator holds the head of the assembly bolt 9 to It is necessary to prevent the assembly bolt 9 from being pulled out. Still, since the rotation is stopped, the operation is easier than before, but the operation is further facilitated by providing the retaining ring 8.

Embodiment 2. FIG.
(A pair of acceleration detection sensors with rotational symmetry)
The output of the acceleration detection sensor can be applied to various uses such as being used as an operation trigger for an airbag, and may be attached to both sides of the vehicle. In such a case, there may be a case where two line-symmetric acceleration detection sensors are attached to the left and right side pillars as a pair, such that the structure is reversed left and right.

  FIG. 12 shows the acceleration detection sensor 4 described so far, and FIG. 13 shows an acceleration detection sensor 4 ′ that is rotationally symmetric with respect to the acceleration detection sensor 4. The structure of the acceleration detection sensor 4 ′ is provided with the same functional parts as the acceleration sensor 4 except that the left and right sides are reversed. Therefore, the name of each part is indicated by the symbol of the member having the same function as the acceleration detection sensor 4. "And a description thereof is omitted.

  As shown in FIG. 6, the assembly bolt 9 has the same size as the recesses 7 a and 7 b and the curved shape portion 7 c (recesses 7 a ′ and 7 b ′ and the curved shape portion 7 c ′). It is also formed at a rotationally symmetric position of 180 degrees with respect to the axis of symmetry. Further, as described with reference to FIG. 3, the ribs 22 a and 22 b are formed at line-symmetric positions outside the housing 2 with respect to the central axis XX of the bush 3. Therefore, any one assembly bolt 9 is used, and the recesses 7a and 7b are engaged with the ribs 22a and 22b of the acceleration detection sensor 4, and any other assembly bolt 9 is used and the recess The common assembly bolt 9 can be used for the acceleration detection sensors 4 and 4 'such that 7a' and 7b 'are engaged with the ribs 22a' and 22b 'of the acceleration detection sensor 4.

  For example, when the acceleration detection sensor 4 is attached to the inner panel 27a, as shown by an arrow in FIG. 12, the rotation direction when tightening the nut 11 is viewed from the head direction of the bolt, so the counterclockwise direction is the tightening direction. 7 receives a force in the direction of the arrow 51 when the nut 11 is tightened, and the concave portion 7b (or the concave portion 7b ') is pressed against the rib 22a. At that time, the engaging portions functioning as detents are the rib 22a and the concave portion 7b ( Or it becomes one place of the recessed part 7b ').

  When the acceleration detection sensor 4 ′ is attached to the inner panel 27a ′ located on the opposite side to the arrangement position of the inner panel 27a on the vehicle body, as shown by the arrow in FIG. Since the plate 7 receives the force in the direction of the arrow 51 'when the nut 11 is tightened, the concave portion 7b' (or the concave portion 7b) is pressed against the rib 22b '. At that time, the engaging portion functioning as a detent is at one place of the rib 22b 'and the concave portion 7b' (or the concave portion 7b).

  Moreover, the recessed part engaged when loosening becomes a recessed part arrange | positioned in the position symmetrical with the recessed part which functioned at the time of nut fastening. That is, the acceleration detection sensor 4 is a recess 7a (or recess 7a ') in FIG. 12, and the acceleration detection sensor 4' is a recess 7a '(or recess 7a) in FIG.

  As another example of the assembly bolt 9, as long as there is at least one concave portion of the fixing member that engages with the rib of the acceleration detection sensor, the rotation detection function of the acceleration detection sensor can be achieved. In this case, in order to be able to use a common assembly bolt even for a symmetrical acceleration detection sensor, for example, the position of the recess in the acceleration detection sensor is set between the recesses 7a and 7b in the assembly bolt 9 in the above example. It is possible to set the positions of the recesses and the ribs appropriately by setting the center position and also setting the acceleration detection sensor 4 to the center position between the ribs 22a and 22b.

  As another example of the assembly bolt 9, the recesses engaged with the ribs have only two recesses 7a and 7b that are in a line-symmetric relation, and the left and right acceleration detection sensors 4, 4 'are used. It is also possible to adapt. This is apparent from the fact that in the example of FIGS. 12 and 13, it can be fixed using only the recesses 7a and 7b. However, in this case, since only the recesses 7a and 7b arranged at one specific rotation position of the assembly bolt are to be engaged with the rib, the operator stops rotation when assembling the assembly bolt to the acceleration detection sensor. Care must be taken so that the position is suitable for engagement between the recess and the rib.

  On the other hand, in the configuration in which the concave portions 7a and 7b and the rotationally symmetrical concave portions 7a ′ and 7b ′ are provided in addition to the linearly symmetrical concave portions 7a and 7b as in the assembly bolt 9 in this example, the ribs and the concave portions Since there are two recesses that can be combined, after inserting the male screw 6, there are more choices in the direction when aligning the rotation position, and the shape can only be assembled at the normal rotation position. In addition, the work of engaging with the rib is made more efficient for the operator. Furthermore, in combination with the symmetrical acceleration detection sensor 4, 4 ', the assembled bolt 9 is attached to the symmetrical acceleration detection sensors 4, 4' in combination with the ribs being arranged symmetrically with respect to the center of the bush 3. Can be used in common. Thereby, parts management man-hours can be reduced (foreign product mixing prevention), and mold costs can be reduced.

With the configuration as described above, the acceleration detection sensor main body is placed on the back side of the vehicle frame, and in the work of tightening the nut from the front side, there is no need to hold the bolt head with a spanner etc. Only the sensor body is lightly held by hand, and tightening workability is greatly improved.
In addition, by simply integrating an inexpensive part such as an assembly bolt as described in the embodiment with the standard-type acceleration detection sensor, variations in the attachment of the acceleration detection sensor can be increased in the vehicle layout.

It is an external appearance perspective view of an acceleration detection sensor. It is an external appearance perspective view of an acceleration detection sensor. It is a front view of an acceleration detection sensor. It is a partial cross section side view of an acceleration detection sensor. It is a disassembled perspective view of a fixing member. (A) is a front view of an assembly | attachment bolt, (b) is a side view of an assembly | attachment bolt. It is a figure explaining the process of temporarily fixing an assembly bolt to an acceleration detection sensor. It is a partial cross section side view explaining the state where the assembly bolt was temporarily fixed to the acceleration detection sensor. It is the front view explaining the state where the assembly bolt was temporarily fixed to the acceleration detection sensor. It is the perspective view explaining the attachment process of the acceleration detection sensor with respect to a side pillar. It is sectional drawing which showed the state which fixed the acceleration detection sensor to the attachment member. It is the figure explaining the action part of the external force applied when fixing an acceleration detection sensor to an attachment member. It is the figure explaining the action part of the external force applied when fixing the acceleration detection sensor in FIG.

Explanation of symbols

  2 Housing, 3 Bush, 4, 4 'Acceleration detection sensor, 6 Male screw, 7 Plate, 7a, 7a', 7b, 7a 'Recess, 8 Retaining ring (fixing piece), 9 Assembly bolt, 10 Fixing member, 11 Nut (Screwing member), 21 fixing portion, 22a, 22a ′, 22b, 22b ′, 22c, 22d rib, 24 pin (rotation preventing means), 27a inner panel (mounting member), 28 opening portion, 30 insertion hole, 31 Pin hole.

Claims (4)

In the mounting structure of the acceleration detection sensor to the mounting member,
An insertion hole formed in the attachment surface of the acceleration detection sensor and the attachment member, a fixing member inserted into the insertion hole, a plate plate larger than the insertion hole formed on one end side of the fixing member, and the plate A fixing portion formed on the opposite surface of the fixing member and a peripheral surface of the fixing member, and a screw portion formed on the other end side of the fixing member inserted through the insertion hole. A mounting structure of an acceleration detection sensor, wherein a screwing member is screwed to fix the acceleration detection sensor to the mounting member.   The acceleration detection sensor according to claim 1, further comprising a retaining ring that is attached to the other end of the fixing member inserted through the insertion hole to prevent the fixing member from coming off and is fastened to the attachment member with a screwing member. Mounting structure.   The structure for mounting an acceleration detection sensor according to claim 1, wherein a plurality of the rotation-preventing uneven engaging portions are arranged symmetrically on the left and right of the central axis of the fixing member. The attachment of the acceleration detection sensor according to any one of claims 1 to 3, wherein a detent means for the acceleration detection sensor is formed between the acceleration detection sensor and the attachment member. Construction.

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