JP2018165123A - Seating sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seating sensor which can inhibit occurrence of excessive deformation in a holder without impairing assemblability.SOLUTION: A seating sensor includes: a holder 31 which is placed on a support member SU while sandwiched between a cushion member of a seat cushion of a vehicle and the support member SU supporting the cushion member; a sensor body 40 which is placed on the holder 31 and detects information of a load applied from the cushion member; a single attachment part 34 which is provided at an end part of the holder 31 and is attached to the support member while constantly contacting with the support member SU; and a deformation inhibition part 35 which is provided at the holder 31 and is located close to the support member SU above the support member SU.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a seating sensor.

  Conventionally, as a seating sensor, what was described, for example in patent documents 1 is known. The seating sensor is disposed below a cushion member of a seat cushion of a vehicle and is placed on a support member (S spring) that supports the cushion member, and load information that is placed on the holder and loaded from the cushion member And a sheet-like sensor body for detecting. The holder is provided with a large number of attachment portions (prevention portions, clips, etc.) that are attached to the support member in a state of being in constant contact with the support member. Thereby, the positioning of the holder with respect to the support member is more accurate.

CN203331880U (Fig. 1-3)

  By the way, in Patent Document 1, the holder is positioned with respect to the support member in a large number of attachment portions, and therefore, the assembly may be difficult due to, for example, dimensional variations due to product variations that occur in the support members. On the other hand, when the number of attachment portions is reduced in order to improve the assemblability, the holder may be excessively deformed by a load applied from the cushion member.

  The objective of this invention is providing the seating sensor which can suppress that an excessive deformation | transformation arises in a holder, without impairing assembly property.

  A seating sensor that solves the above-mentioned problem is mounted on the support member in a state of being sandwiched between a cushion member of a vehicle seat cushion and a support member that supports the cushion member, and placed on the holder, A sensor body that detects load information loaded from a cushion member, a single mounting portion that is provided at an end of the holder and is attached to the support member in a state of being always in contact with the support member, and the holder And a deformation suppressing part that is close to the support member above the support member.

  According to this configuration, the holder is positioned at only one place of the mounting portion with respect to the support member, so that, for example, even if the support member has a dimensional variation due to a product variation or the like, the assembling property is impaired. Can be suppressed. Further, when the holder is deformed by a load applied from the cushion member, the deformation is suppressed by the deformation restraining portion coming into contact with the support member. Thereby, possibility that an excessive deformation | transformation will arise in the said holder can be reduced more.

About the said seating sensor, it is preferable that the said deformation | transformation suppression part is shape | molded according to the shape of the opposing part of the said supporting member in the load direction from the said cushion member.
According to this configuration, the deformation suppressing portion is formed in accordance with the shape of the opposed portion of the support member, so that a load is applied when the deformation suppressing portion abuts on the support member as the holder is deformed. It is possible to suppress the occurrence of the concentrated portion and buckling of the deformation suppressing portion.

About the said seating sensor, it is preferable to provide two or more said deformation | transformation suppression parts.
According to this configuration, excessive deformation of the holder can be more firmly suppressed by the cooperation of the plurality of deformation suppression units.

  The present invention has an effect of suppressing an excessive deformation of the holder without impairing the assembling property.

The longitudinal cross-sectional view which shows the structure about one Embodiment of a seating sensor. The perspective view which shows the structure about the seating sensor of the embodiment. The side view which shows the structure about the seating sensor of the embodiment. The top view which shows the structure about the seating sensor of the embodiment. (A), (b) is the perspective view and its enlarged view which show the structure about the seating sensor of the embodiment. (A), (b) is the perspective view and its enlarged view which show the structure about the seating sensor of the embodiment. Sectional drawing along line 7-7 in FIG.

Hereinafter, an embodiment of the seating sensor will be described. Hereinafter, the front-rear direction of the vehicle is referred to as “front-rear direction”.
As shown in FIG. 1, a lower rail 2 is fixed to a vehicle floor 1 in a state of extending in the front-rear direction, and an upper rail 3 is connected to the lower rail 2 so as to be movable in the front-rear direction. Has been.

  The lower rail 2 and the upper rail 3 are both arranged in a pair in the width direction (a direction perpendicular to the paper surface in FIG. 1), and here, the lower rail 2 and the upper rail 3 are arranged on the right side toward the front. The upper rails 3 are fixed and supported by a seat 5 that forms a seat for the occupant.

  The seat 5 includes a seat cushion 6 that forms a seating surface, and a seat back 7 that is supported at the rear end portion of the seat cushion 6 so as to be tiltable (rotatable). The seat cushion 6 includes a cushion frame 10 that forms a skeleton thereof, and a cushion member 20 that is covered by the cushion frame 10. The cushion frame 10 includes a pair of cushion side frames 11 made of, for example, a metal plate, which are arranged side by side in the width direction and are placed on the upper rails 3. The cushion frame 10 extends in the width direction and has a substantially cylindrical front connection rod 12 that connects the front portions of the cushion side frames 11, and the cushion frame 10 extends in the width direction and extends between the cushion side frames 11. It has a substantially cylindrical rear connecting rod 13 that connects the rear portions. The cushion member 20 has a cushion pad 21 made of, for example, urethane resin, and is supported by the cushion frame 10 so as to cover the entire cushion frame 10 from above.

  That is, as shown in FIGS. 2 and 3, a plurality of S springs 14 extending basically in the front-rear direction are basically spaced between the front connecting rod 12 and the rear connecting rod 13 in the width direction. It is being handed over. Each S spring 14 is made of a wire having a substantially circular cross section, and has a flat portion 14a located on a plane extending substantially horizontally below the front connecting rod 12 and the rear connecting rod 13. Each S spring 14 is connected to the front end of the flat portion 14a and extends obliquely upward to the front and is hooked to the front connecting rod 12, and is connected to the rear end of the flat portion 14a and obliquely upward to the rear. And a rear inclined portion 14c that extends and is hooked to the rear connecting rod 13. The plurality of S springs 14 are provided with a substantially cylindrical connecting rod 15 extending in the width direction at the connecting position of the flat portion 14a and the front inclined portion 14b, and these connecting positions are integrated with the connecting rod 15. A plurality of resin molds 16 and 17 are formed so as to cover them. Similarly, a substantially cylindrical connecting rod 15 extending in the width direction is placed on the plurality of S springs 14 at the connecting position of the flat portion 14a and the rear inclined portion 14c. A pair of S springs 14 adjacent to each other at the center is formed with a resin mold 18 that integrally covers the connecting positions together with the connecting rod 15. Each of the S springs 14 at both ends is formed with a resin mold 19 that integrally covers the corresponding connection position together with the connection rod 15. The cushion member 20 is supported by the cushion frame 10 at the S spring 14, the connecting rods 15, and the resin molds 16 to 19. The plurality of S springs 14, the connecting rods 15, and the resin molds 16 to 19 constitute a support member SU.

  As shown in FIG. 4, a seating sensor 30 is mounted on the support member SU. The seating sensor 30 includes a holder 31 made of, for example, a resin material that is placed on the support member SU while being sandwiched between the cushion member 20 and the support member SU. This holder 31 has a substantially square plate-like pedestal portion 32 that extends in the front-rear direction and has a width dimension that matches the minimum separation distance between the flat portions 14a of a pair of adjacent S springs 14 at the center. In addition, a pair of substantially triangular projecting portions 33 projecting in the width direction opposite to each other from the front end portion of the pedestal portion 32 are provided. An edge portion 33a extending obliquely rearward from the front end in the width direction of each projecting portion 33 toward the pedestal portion 32 is an inclination of each flat portion 14a extending so that the separation distance in the width direction between both flat portions 14a gradually changes. It is located immediately above the portion 14d.

  As shown in FIG. 3, a mounting portion 34 projects downward from the front end of the holder 31 so as to face the central portion of the connecting rod 15 exposed from both resin molds 16 adjacent in the width direction. . The mounting portion 34 has a pair of mounting pieces 34a and 34b arranged in parallel in the front-rear direction and is formed in a substantially U shape. The front end of the holder 31 is attached in a state in which the front end of the holder 31 is always in contact with the support member SU with the connecting rod 15 (support member SU) sandwiched between the attachment pieces 34a and 34b.

  On the other hand, the rear end portion 31a of the holder 31 (base portion 32) is placed on the resin mold 18 (support member SU). That is, the holder 31 is supported at both ends by the support member SU at the two points of the front end (single attachment portion 34) and the rear end portion 31a.

  As shown in FIGS. 5 (a) and 5 (b), at the tip of each protrusion 33 in the width direction, a substantially arcuate groove-like deformation that protrudes upward along the upper surface (arc surface) of each inclined portion 14d. The suppression part 35 is formed. The deformation suppressing portion 35 has an inner diameter set slightly larger than the diameter of the inclined portion 14d, and is normally (initially) slightly spaced above the inclined portion 14d by a clearance Δ1. In other words, each deformation suppressing portion 35 is close to the inclined portion 14d. At this time, each deformation | transformation suppression part 35 shape | molded by the substantially circular arc groove shape follows the shape of the opposing part of the support member SU (inclined part 14d) in the load direction (downward) from the cushion member 20. FIG. For example, when the holder 31 is deformed by a load applied from the cushion member 20 when the occupant is seated, both deformation suppressing portions 35 can come into contact with the support member SU (inclined portion 14d).

  Further, as shown in FIGS. 6A and 6B, reinforcing ribs 36 are formed in the lower portion of each protrusion 33, and each rib 36 has an edge portion. A plurality of deformation suppressing portions 36a arranged side by side along 33a are formed. That is, the plurality of deformation suppressing portions 36a are arranged in parallel with the deformation suppressing portion 35 in the axial direction of the inclined portion 14d (S spring 14). Each deformation suppressing portion 36a has a substantially arcuate groove shape that protrudes upward along the upper surface (arc surface) of the inclined portion 14d. Each deformation suppressing portion 36a is set to have an inner diameter slightly larger than the diameter of the inclined portion 14d, and normally (initially) close to the inclined portion 14d. At this time, each deformation | transformation suppression part 36a shape | molded by the substantially circular arc groove shape follows the shape of the opposing part of the support member SU (inclination part 14d) in the load direction (downward) from the cushion member 20. FIG. For example, when the holder 31 is deformed by a load applied from the cushion member 20 when the occupant is seated, the plurality of deformation suppressing portions 36a can contact the support member SU (inclined portion 14d).

  Further, as shown in FIG. 7, the holder 31 is provided with a substantially rectangular columnar protruding portion 37 protruding downward from the pedestal portion 32 behind the protruding portions 33. On the other hand, the resin mold 18 has a pair of substantially cylindrical mold portions 18a concentrically covering both the flat portions 14a. The protruding portion 37 is disposed at the center of the pedestal portion 32 sandwiched between the mold portions 18 a in the width direction, and a pair of steps in the width direction formed between the lower surface of the pedestal portion 32 and the protruding portion 37. Each form a deformation suppressing portion 38. In a state where the holder 31 is supported by the support member SU, the projecting portion 37 is sandwiched between both mold portions 18a. At this time, both deformation suppressing portions 38 are usually (initially) slightly spaced above the mold portions 18a by a clearance Δ2. That is, both deformation suppressing portions 38 are close to the upper portions of both mold portions 18a. For example, when the holder 31 is deformed by a load applied from the cushion member 20 when the occupant is seated, the deformation suppressing portions 38 can contact the support member SU (mold portion 18a).

  However, the two deformation suppressing portions 38 come into contact with the support member SU when the holder 31 is further deformed while the two deformation suppressing portions 35 and the plurality of deformation suppressing portions 36a are in contact with the support member SU as the holder 31 is deformed. It comes to touch. This is because the two deformation suppressing portions 35 and the plurality of deformation suppressing portions 36a are basically located closer to the center of the two-point support of the holder 31 by the support member SU than the two deformation suppressing portions 38. This is because the clearance Δ2 is set in consideration of the above.

  As shown in FIG. 2, a sensor body 40 that extends in the front-rear direction along the pedestal portion 32 is placed on the holder 31. The sensor body 40 is a membrane in which a pair of contact sheets formed by printing a conductive ink (for example, silver paste, carbon paste) on an insulating film (for example, a polyester film) is laminated via an insulating spacer (for example, a polyester film). It consists of a switch. The sensor body 40 detects load information applied from the cushion member 20. In addition, the substantially multi-circular detection unit 41 related to the load detection of the sensor body 40 extends in the front-rear direction between two points where the holder 31 is supported by the support member SU.

Next, the effect of this embodiment will be described.
(1) In the present embodiment, the holder 31 is positioned only at one position of the mounting portion 34 with respect to the support member SU. For example, even if the support member SU has a dimensional variation due to a product variation or the like, the holder 31 can be assembled. Can be prevented from being damaged. Further, when the holder 31 is deformed by a load applied from the cushion member 20, the deformation is suppressed by the two deformation suppressing portions 35, the plurality of deformation suppressing portions 36a or the both deformation suppressing portions 38 being in contact with the support member SU. The Thereby, possibility that an excessive deformation | transformation will arise in the holder 31 can be reduced more. For example, it is possible to further reduce the possibility of significant bending deformation at the intermediate portion in the front-rear direction, which is the extending direction of the holder 31. In particular, the seating sensor 30 located below the cushion member 20 needs to satisfy the detection performance in consideration of the position shift of the butt of the occupant on the seat cushion 6 and the seating sensor 30 (holder 31). ) Is forced to increase in size. Therefore, since the holder 31 thus enlarged is more easily deformed, the suppression of the excessive deformation is more effective.

  (2) In the present embodiment, both deformation suppressing portions 35 are formed in accordance with the shape of the facing portion of the support member SU (inclined portion 14d) in the load direction from the cushion member 20. Therefore, it is possible to prevent the deformation suppressing portion 35 from buckling due to the occurrence of a load concentration site when the deformation suppressing portions 35 come into contact with the support member SU as the holder 31 is deformed. Further, the plurality of deformation suppressing portions 36 a are formed in accordance with the shape of the facing portion of the support member SU (flat portion 14 a) in the load direction from the cushion member 20. Therefore, when the plurality of deformation suppression portions 36a come into contact with the support member SU as the holder 31 is deformed, it is possible to suppress the occurrence of load concentration sites and buckling of the deformation suppression portions 36a.

(3) In the present embodiment, excessive deformation of the holder 31 can be more firmly suppressed by the cooperation of the two deformation suppressing portions 35, the plurality of deformation suppressing portions 36a, and the two deformation suppressing portions 38.
(4) In the present embodiment, since the sensor body 40 is a membrane switch formed in a film shape, the sensor body 40 can be made thinner and can further improve the drip-proof property and the dust-proof property.

  (5) In the present embodiment, the two deformation suppression units 35, the plurality of deformation suppression units 36a, and the two deformation suppression units 38 are normally in a non-contact state with the support member SU, so that, for example, the support member SU has product variations. Even if dimensional variation occurs due to the above, it is possible to prevent the assembling property from being impaired or the residual stress from being generated in the holder 31.

  (6) In the present embodiment, both the deformation suppressing portions 38 basically have the holder 31 in a state in which the both deformation suppressing portions 35 and the plurality of deformation suppressing portions 36a come into contact with the support member SU as the holder 31 is deformed. It contacts the support member SU when it is deformed. That is, both the deformation | transformation suppression parts 38 are the auxiliary positions when the holder 31 deform | transforms remarkably. In this case, since both the deformation suppressing portions 38 are flat surfaces, for example, even if each mold portion 18a is displaced due to the substantially arc-shaped groove-shaped deformation suppressing portion 35 coming into contact with the inclined portion 14d, the mold portions 18a are displaced. The contact with the portion 18a can be further stabilized. In other words, for example, when the relative positions of the holder 31 and the support member SU are deviated due to assembly variation or the like, if the deformation suppression portion 38 has a substantially arcuate groove shape, the deformation suppression portion 35 or the like comes into contact with the front. Therefore, the corresponding contact becomes unstable when contacting each mold part 18a.

  (7) In the present embodiment, the holder 31 is normally supported by the front end (attachment portion 34) and the rear end portion 31a in contact with the support member SU at two points. And when the holder 31 deform | transforms with the load loaded from the cushion member 20, the excessive deformation | transformation of the holder 31 is suppressed by increasing the contact location with the support member SU by both deformation | transformation suppression parts 35 grade | etc.,. Accordingly, for example, when the number of locations where the holder is always fixed (positioned) with respect to the support member SU is increased to suppress excessive deformation, the holder 31 may be poorly assembled due to dimensional variations due to product variations or the like. Further, it is possible to suppress the holder 31 from being deformed by the stress under the temperature environment.

(8) In the present embodiment, the number of manufacturing steps can be further reduced by forming the plurality of deformation suppressing portions 36a using the reinforcing ribs 36.
In addition, you may change the said embodiment as follows.

In the embodiment, at least a part of the plurality (four) of the S springs 14 may be connected as a single wire, or all may be separated from each other.
-In the said embodiment, you may employ | adopt S spring whose cross section is shapes (for example, substantially square) other than substantially circle shape. In this case, it is preferable that the deformation suppressing portion 35 and the plurality of deformation suppressing portions 36a are formed in a substantially U-shaped groove shape following the shape of the opposing portion of the S spring.

  -In the said embodiment, you may leave a part of both the deformation | transformation suppression part 35, the some deformation | transformation suppression part 36a, and both the deformation | transformation suppression parts 38, and may omit others. For example, the two deformation suppressing portions 35 may be left and the others may be omitted, the plurality of deformation suppressing portions 36a may be left and the others may be omitted, and the two deformation suppressing portions 38 may be left and the others may be omitted. May be.

  In the above-described embodiment, the both deformation suppressing portions 35 may not be formed according to the shape of the facing portion of the support member SU (inclined portion 14d) in the load direction from the cushion member 20. That is, both the deformation | transformation suppression parts 35 may be shape | molded, for example in the U-shaped groove shape, and may be shape | molded flatly. Similarly, the plurality of deformation suppressing portions 36a may not be formed following the shape of the facing portion of the support member SU (inclined portion 14d) in the load direction from the cushion member 20. That is, the some deformation | transformation suppression part 36a may be shape | molded, for example in the U-shaped groove shape, and may be shape | molded flatly.

  -In the said embodiment, the support member formed by spanning the some S spring extended in the width direction between the both cushion side frames 11 in the state which opened the space | interval in the front-back direction may be sufficient. .

-In the said embodiment, the support member comprised only with several S spring 14 may be sufficient.
-In the above-mentioned embodiment, as for attachment part 34, at least one of both attachment pieces 34a and 34b may be divided into plurality by the width direction. That is, the single attachment portion 34 means that the positioning function is substantially one place, and the apparent number may be plural.

  -In the said embodiment, if the attaching part 34 is provided in the edge part of the holder 31, the arrangement | positioning is arbitrary. For example, the holder 31 may be disposed at the front end portion or the rear end portion (rear end).

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(A) In the seating sensor,
The sensor body is a seating sensor, which is a membrane switch formed in a film shape.

  According to this configuration, since the sensor body is a membrane switch formed in a film shape, the sensor body can be made thinner and can further improve the drip-proof property and the dust-proof property.

  SU ... support member, 6 ... seat cushion, 10 ... cushion frame, 11 ... cushion side frame, 12 ... front connecting rod, 13 ... rear connecting rod, 14 ... S spring, 20 ... cushion member, 30 ... seating sensor, 31 ... Holder, 34 ... mounting portion, 35, 36a, 38 ... deformation suppressing portion, 40 ... sensor body.

Claims (3)

A holder placed on the support member in a state sandwiched between a cushion member of a vehicle seat cushion and a support member supporting the cushion member;
A sensor body mounted on the holder and detecting load information loaded from the cushion member;
A single mounting portion provided at an end of the holder and attached to the support member in a state of being in constant contact with the support member;
A seating sensor provided with a deformation suppression part provided in the holder and close to the support member above the support member. The seating sensor according to claim 1,
The said deformation | transformation suppression part is a seating sensor shape | molded according to the shape of the opposing part of the said supporting member in the load direction from the said cushion member. The seating sensor according to claim 1 or 2,
A seating sensor comprising a plurality of the deformation suppressing portions.