JP2024036591A - Arrangement structure of pressure sensor on seat - Google Patents

Abstract

An object of the present invention is to provide a structure for arranging a pressure sensor on a seat, which can accurately detect that an occupant is seated on the seat, and improve the seating feeling of the occupant. In a structure in which a pressure sensor 1 is arranged on a seat 10 including a cushion pad 12, the pressure sensor 1 is configured with a push switch, is located on the lower surface 12B side of the cushion pad 12, and is placed on the seat 10. The cushion pad 12 is placed in a position where the lower surface 12B of the cushion pad 12 comes into pressure contact with the push switch to press it down when the occupant is seated, and avoids the wire 19 that is placed in the center of the left-right direction of the seat 10 and extends in the front-rear direction. It is placed in the same position. [Selection diagram] Figure 9

Description

The present invention relates to a structure for arranging pressure sensors on a seat.

A pressure sensor that detects whether or not an occupant is seated on the seat may be disposed on the seat (see Patent Document 1).
Such pressure sensors can be used, for example, in technologies such as seatbelt reminders, which issue a warning if an occupant is seated in the seat but not wearing a seatbelt. It can be used to detect.

Japanese Patent Application Publication No. 2014-100941

In the past, when such a pressure sensor was placed on a seat, it was sometimes placed between the cushion pad and the skin of the seat cushion of the seat, as described in Patent Document 1, for example.
However, if the pressure sensor is placed between the cushion pad and the outer skin, i.e. just below the outer skin, something may come into contact with the buttocks or thighs of the occupant seated through the seat skin. This may result in a poor sitting feeling.

Further, when the pressure sensor is placed directly under the surface of the seat, there is a problem in that the placement of the pressure sensor is likely to be restricted by the position of the hanging groove and the like.
On the other hand, when a pressure sensor is arranged on a seat, it goes without saying that the pressure sensor is required to be able to accurately detect that an occupant is seated on the seat.

The present invention has been made in view of the above circumstances, and provides a structure for arranging pressure sensors on a seat that can accurately detect when an occupant is seated on the seat and improve the seating feeling of the occupant. The purpose is to provide.

In order to solve the above problems, the invention according to claim 1 provides a structure for arranging a pressure sensor on a seat provided with a cushion pad.
The pressure sensor is
Consists of a push switch,
a position on the lower surface side of the cushion pad, where the lower surface of the cushion pad comes into pressure contact with the push switch and presses it down when an occupant is seated on the seat;
Further, it is characterized in that it is arranged at a position that is arranged in the center of the seat in the left-right direction and avoids a wire that extends in the front-rear direction.

The invention according to claim 2 is the arrangement structure of the pressure sensor on the sheet according to claim 1,
The wire is arranged at a position directly below a center line in the left-right direction of a seating area of the cushion pad on which an occupant is seated.

The invention according to claim 3 is the arrangement structure of the pressure sensor on the sheet according to claim 1 or claim 2,
The pressure sensor is arranged at a position shifted from the wire in the left-right direction.

The invention according to claim 4 is the arrangement structure of the pressure sensor on the sheet according to claim 3,
The pressure sensor is arranged at a position shifted from the wire either to the left or to the right.

The invention according to claim 5 is the arrangement structure of the pressure sensor on the sheet according to claim 3,
The pressure sensors are arranged at two positions shifted from the wire to the left and to the right.

The invention according to claim 6 is the arrangement structure of the pressure sensor on the sheet according to any one of claims 3 to 5,
Attachment portions to which the pressure sensor can be attached are provided at positions shifted leftward and rightward from the wire, respectively.

The invention according to claim 7 is the arrangement structure of the pressure sensor on the sheet according to claim 6,
The attachment portion is provided at a position symmetrical with respect to the wire.

The invention according to claim 8 is the arrangement structure of the pressure sensor on the sheet according to claim 6 or claim 7,
The pressure sensor is configured to be attached to the attachment portion by engagement between an engagement structure provided on the pressure sensor and an engagement structure provided on the attachment portion. shall be.

The invention according to claim 9 is the arrangement structure of the pressure sensor on the sheet according to claim 8,
The engagement structure of the pressure sensor is a convex portion provided on the pressure sensor,
The engagement structure of the attachment portion is a hole provided in the attachment portion that can engage with the convex portion.

According to the invention described in claim 1, since the pressure sensor is placed in a position avoiding the wire placed in the center of the seat in the left-right direction, the pressure sensor is placed in a position where the load on the seat cushion from the seated occupant is low. It becomes possible to arrange the seat not at the center position but at a position shifted from the center of the seat in the left-right direction, where the load is high. Therefore, a pressure sensor can detect pressure at the position where the load on the seat cushion is highest, or at a position close to it, and when an occupant is seated on the seat, it can be detected with high sensitivity and accurately detected. It becomes possible to detect.
In addition, because the push switch as a pressure sensor is placed on the underside of the cushion pad, the pressure sensor does not touch the buttocks or thighs of the occupant seated on the seat through the seat skin. Therefore, it is possible to improve the seating feeling of the occupant.

According to the invention as set forth in claim 2, the wire is arranged at a position directly below the center line in the left-right direction of the seating area of the cushion pad on which the occupant sits, and the pressure sensor is arranged at a position avoiding the wire. It becomes possible to arrange the pressure sensor at a position where the load received by the seat cushion from the seated occupant is high. Therefore, it becomes possible to reliably detect that the occupant is seated on the seat using the pressure sensor.

According to the invention set forth in claim 3, the fact that an occupant is seated on the seat is accurately detected by the pressure sensor arranged at a position shifted in the left-right direction of the wire, where the seat cushion receives a high load from the seated occupant. It becomes possible to do so.

According to the invention set forth in claim 4, one pressure sensor placed at a position shifted in the left-right direction of the wire where the seat cushion receives a high load from the seated occupant can accurately detect that the occupant is seated on the seat. And it becomes possible to detect efficiently.

According to the invention set forth in claim 5, it is ensured that the occupant is seated on the seat using the two pressure sensors arranged at positions shifted in the left-right direction of the wire, where the seat cushion receives a high load from the seated occupant. It becomes possible to detect

According to the invention described in claim 6, since the pressure sensor is attached to the attachment parts provided at positions shifted leftward and rightward from the wire, the pressure sensor can be attached by changing the attachment parts to which the pressure sensor is attached. It becomes possible to switch the arrangement position of the wire to the left or right, and it becomes possible to switch easily.

According to the invention set forth in claim 7, since the mounting portions are provided at symmetrical positions with respect to the wire, it is possible to obtain the same sensor sensitivity on the left and right sides, no matter which mounting portion the pressure sensor is attached to. It becomes possible.

According to the invention set forth in claim 8, the pressure sensor can be assembled by engaging and disengaging the engagement structure provided on the pressure sensor and the engagement structure provided on the mounting portion. can be easily removed from the mounting section.

According to the invention described in claim 9, the pressure sensor can be easily attached to the mounting portion by engaging and disengaging the convex portion provided on the pressure sensor and the hole provided in the mounting portion. It becomes possible to remove it.

It is a perspective view showing a seat. FIG. 2 is a perspective view showing the structure of a cushion pad of a seat cushion. It is a figure showing the seating area of a seat cushion or a cushion pad, and the center line of the seating area in the left-right direction. FIG. 3 is a perspective view showing a pressure sensor and the like arranged on a seat cushion frame and a pan frame. FIG. 2 is a perspective view showing the configuration of a pressure sensor. It is an enlarged view showing a recessed part, a mounting part, etc. provided in a pan frame, (A) is a top view, and (B) is a perspective view. It is an enlarged view showing the attachment part etc. where the pressure sensor was attached, (A) is a top view, and (B) is a perspective view. FIG. 7B is a partial cross-sectional view taken along line XX in FIG. 7(B). It is a partial sectional view showing a state in which a pressure sensor is arranged on the lower surface side of the cushion pad. FIG. 6 is a diagram showing that the load applied to the seat cushion from a seated occupant becomes higher at positions shifted in the left-right direction of the seat cushion. FIG. 3 is a partial cross-sectional view showing a state in which a pressure sensor is placed directly below a hollow portion formed in the cushion pad. FIG. 7 is a partial cross-sectional view showing a state in which a recess is provided in the lower surface of the cushion pad above the pressure sensor. FIG. 3 is a perspective view showing a state in which a plurality of pressure sensors are attached to the attachment part.

Embodiments of the present invention will be described below with reference to the drawings. However, although the embodiments described below have various limitations that are technically preferable for implementing the present invention, the technical scope of the present invention is not limited to the embodiments and illustrated examples below. do not have.

A seat 10 shown in FIG. 1 is provided in a vehicle such as an automobile, and is used for seating an occupant of the vehicle. In addition, although the case where the seat 10 is mainly used as a front passenger seat will be described below, the seat 10 is not limited to this case, and can be used as a rear seat of a 2-row seat or a seat in the 2nd or 3rd row of a 3-row seat. It may be a seat other than the passenger seat, such as the second seat.

As shown in FIG. 1, the seat 10 includes a seat cushion 11 that supports the buttocks and thighs of an occupant, a seat back 14 whose lower end is supported by the seat cushion 11 and serves as a backrest, and a seat provided on the seat back 14. and a headrest 16 that supports the head of the occupant. In addition, auxiliary support parts such as a neck rest, arm rest, foot rest, and ottoman may be provided.

As shown in FIG. 2, the seat cushion 11 includes a seat cushion frame 17 serving as a skeleton (see FIG. 4 described later), a cushion pad 12 provided on the seat cushion frame 17, and the seat cushion frame 17 and the cushion pad 12. A skin 13 (not shown in FIG. 2, see FIG. 1) covers the surface of the sheet and constitutes the surface of the sheet.

In this embodiment, the seat cushion 11 is provided with a ventilation path 30 for air (hot air or cold air) between the cushion pad 12 and the outer skin 13, but in the present invention, the ventilation path 30 etc. is not necessarily provided. It doesn't have to be.
In this embodiment, as shown in FIG. 2, the cushion pad 12 is provided with an air passage recess 30A that forms a part of the air passage 30. Further, a recess (not shown) forming the remaining part of the air passage 30 is provided at a position of the cover member 12A corresponding to the air passage recess 30A, and a predetermined portion of the cushion pad 12 of the cover member 12A is provided. A ventilation passage 30 is formed by fitting it into the hole.

Further, a plurality of punching holes are formed in the cover member 12A, and these punching holes are used as the air outlet 30C of the air passage 30. The cushion pad 12 including the cover member 12A is covered with a breathable skin 13 at least in a portion corresponding to the air outlet 30C.
Then, air sent from a blower (not shown) is sent into the ventilation passage 30 through the through hole 30B, and the air that has circulated inside the ventilation passage 30 is blown out from the air outlet 30C of the ventilation passage 30 toward the occupant. It has become so.

Hereinafter, in this embodiment, a symmetrical area (see the shaded area in FIG. 3) where an occupant can sit on the seat cushion 11 and the cushion pad 12 will be referred to as a seating area R. The symbol CL represents the center line of the seating area R in the left-right direction (the center line CL extends in the front-rear direction of the seating area R). Note that when the seat 10 is rotated horizontally with respect to the vehicle (not shown), the seating area R also rotates horizontally in accordance with the rotation of the seat pad 12, etc., and the seating area R is rotated horizontally and its center line. CL will also rotate horizontally.

In this embodiment, a seat cushion frame 17 is provided below the cushion pad 12 of the seat cushion 11, as shown in FIG. The seat cushion frame 17 has a pair of left and right side frames 17A, and a connecting member 17B that connects the front end and rear end of each side frame 17A, respectively (the connecting member 17B on the front end side is connected to the lower side of the pan frame 18). ) and a pan frame 18 installed between each side frame 17A and each connecting member 17B.
The pressure sensor 1 is arranged on the upper surface of the pan frame 18. The pan frame 18 may be made of iron or resin, and there is no particular limitation on the material.

Further, in this embodiment, as shown in FIG. 4, a wire 19 made of iron or the like is arranged in the center portion of the seat 10 in the left-right direction in the pan frame 18 so as to extend in the front-rear direction of the seat 10. In this embodiment, the wire 19 is placed directly below the center line CL (see FIG. 3) of the seating area R of the seat cushion 11 and cushion pad 12 described above.
The bread frame 18 is reinforced by the wire 19, and in this embodiment, the wire 19 is embedded and integrally formed in the pan frame 18. Note that it is also possible to arrange the wire 19 at a position other than the position directly below the center line CL of the seating area R, and to arrange a plurality of wires 19.

The configuration of the pressure sensor 1 will be explained below. FIG. 5 is a perspective view showing the configuration of the pressure sensor 1.
As shown in FIG. 5, the pressure sensor 1 is comprised of a push switch in which a contactor, a coil spring, etc. (not shown) are built into a cover 1A and a case 1B. The cover 1A of the pressure sensor 1 is movable in the vertical direction with respect to the case 1B, and the pressure sensor 1 detects pressure when the cover 1A is pressed down by the cushion pad 12, as will be described later. It is designed to detect that a person is seated on the seat 10.

The pressure sensor 1 also has a connector to which a harness or the like (not shown) electrically connects the pressure sensor 1 and an external device (not shown; power supply, signal processing device from the pressure sensor 1, etc.). Section 2 is provided.
Moreover, in this embodiment, the pressure sensor 1 is attached to the attachment part 21 and disposed within the seat 10, as will be described later. The pressure sensor 1 has a lower engagement structure that can engage with an engagement hole 22 (described later in FIGS. 6A and 6B) provided in the mounting portion 21 (see FIGS. 6(A) and 6(B) described later). A convex portion (claw portion) 4 protruding outward from the side surface of the case 3 is provided.

Although FIG. 5 shows a case where the pressure sensor 1 is a circular sensor, the pressure sensor 1 may have a rectangular shape, and the shape of the pressure sensor 1 is not particularly limited.
Further, in this embodiment, a case will be described in which the above-mentioned convex portions 4 are provided at each position symmetrical about the center of the sensor (two in total), but even one convex portion 4 may be provided. Alternatively, three or more may be provided.

Next, the configuration of the recess 20 and the attachment portion 21 provided in the pan frame 18 will be explained in detail.
As shown in FIG. 4, a recess 20 is provided on the upper surface of the pan frame 18. The recess 20 is provided with two attachment parts 21 to which the pressure sensor 1 can be attached, and in this embodiment, the pressure sensor 1 can be attached to either of the attachment parts 21. .

In addition, although the case where the attachment part 21 is provided in two places in the recessed part 20 as mentioned above is demonstrated below, the attachment part 21 may be provided in only one place, and it may be provided in three or more places. may be provided. Moreover, although the case where only one pressure sensor 1 is arranged as mentioned above will be described below, a plurality of pressure sensors 1 may be arranged. Note that the case where a plurality of pressure sensors 1 are arranged will be explained later.

6(A) and 6(B) are enlarged views showing the recess 20, mounting portion 21, etc. provided in the pan frame 18, FIG. 6(A) is a plan view, and FIG. 6(B) is a perspective view. be. The recess 20 is provided so as to straddle the left and right sides of the wire 19 arranged at the center of the pan frame 18, and is formed to be lower than the upper surface of the pan frame 18.
The attachment portions 21 are provided in the recess 20 at positions away from the wire 19, that is, at positions shifted leftward and rightward from the wire 19, respectively. The attachment portion 21 is provided at a symmetrical position with respect to the wire 19.

Specifically, in this embodiment, the wire 19 is arranged at the center of the recess 20 of the pan frame 18.
As shown in FIGS. 6(A) and 6(B), the left and right portions of the wire 19 in the recess 20 provided in the pan frame 18 are further recessed downward into a substantially circular shape, so that the mounting portions 21 are respectively attached. It is formed. Note that the reference numeral 18A shown in FIGS. 6(A), 6(B), etc. will be explained later.

In addition, engagement holes 22 are provided in the front and rear portions of the mounting portion 21, respectively, as engagement structures capable of engaging with the convex portion 4 of the pressure sensor 1 described above. Note that the engagement structure may be a bottomed recess, a groove, or the like instead of the hole 22, and is not limited to the hole 22 as long as it can engage with the engagement structure of the pressure sensor 1. Furthermore, the engagement structure on the pressure sensor 1 side is not limited to the convex portion 3 as long as it can engage with the engagement structure of the mounting portion 21.
Moreover, in this embodiment, the rib 23 is provided so as to extend in the left-right direction so as to straddle the wire 19 .

In this embodiment, as shown in FIGS. 7A and 7B, when the pressure sensor 1 is attached to one of the attachment sections 21 provided as described above (for example, the left attachment section 21), As shown in 8, two convex portions 3 (i.e., an engagement structure) provided on the pressure sensor 1, and an engagement hole 22 (i.e., an engagement structure) provided in the front and rear parts of the mounting portion 21. and are engaged.
That is, when the pressure sensor 1 is pushed into the mounting part 21 from above, the hole 22 of the mounting part 21 is slightly expanded forward and backward by the tapered part of the convex part 3 of the pressure sensor 1, and then the pressure sensor 1 is pushed into the mounting part 21 from above. The convex portion 3 of one fits into the hole 22 of the attachment portion 21 and engages with it.

In this embodiment, the pressure sensor 1 can be easily attached to the attachment part 21 in this way.
In this embodiment, as described above, the pressure sensor 1 and the mounting part 21 are each provided with an engagement structure, and by engaging them, the pressure sensor 1 and the mounting part 21 are engaged, and the pressure The sensor 1 is attached to the attachment part 21. Therefore, no intermediate member such as a bracket is required to attach the pressure sensor 1 to the attachment part 21, and the pressure sensor 1 can be attached to the attachment part 21 with a single touch.
Note that it is also possible to configure the pressure sensor 1 so that the convex portion 3 can move in and out while being biased outward.

On the other hand, when the pressure sensor 1 is attached to the mounting portion 21, the rib 23 comes into contact with the pressure sensor 1 from the side (right side in this case) as shown in FIGS. 7(A) and 7(B).
As described above, in the present embodiment, the pressure sensor 1 attached to the attachment part 21 is moved up and down with respect to the attachment part 21 by the engagement of the convex part 3 with the hole 22 of the attachment part 21. In addition, the pressure sensor 1 is prevented from moving in the forward and backward directions, and due to the engagement of the convex portion 3 of the pressure sensor 1 with the hole 22 of the mounting portion 21 and the abutment of the rib 23 from the side, The pressure sensor 1 is prevented from moving in the left-right direction.
In this embodiment, in this way, the pressure sensor 1 can be attached to the attachment part 21 in a state where the pressure sensor 1 is accurately positioned within the attachment part 21.

Further, in this embodiment, when the pressure sensor 1 is attached to the mounting portion 21, the top surface of the cover 1A of the pressure sensor 1 and the top surface of the pan frame 18 are made substantially flush with each other, as shown in FIG. It has become.
Note that although FIGS. 7A and 7B show the case where the pressure sensor 1 is attached to the left attachment part 21 of the two attachment parts 21 provided in the recess 20, the pressure sensor 1 is attached to the right attachment part 21. It is also possible to install a pressure sensor 1.

In this embodiment, the pressure sensor 1 is thus arranged at a position shifted in the left-right direction from the wire 19 and the center line CL in the left-right direction of the seating area R.
The pressure sensor 1 is arranged at a position shifted from the wire 19 or the center line CL of the seating area R in the left-right direction or the right direction.
Furthermore, as described above, the pressure sensor 1 can be attached to either the left or right attachment part 21, and the attachment part 21 according to this embodiment is arranged at a position where the pressure sensor 1 is arranged. The mounting structure is such that it can be switched at each position shifted in the left-right direction from the wire 19 or the center line CL in the left-right direction of the seating area R.

In this embodiment, the pressure sensor 1 is located at a position on the lower surface 12B side of the cushion pad 12 of the seat cushion 11, as shown in FIG. 12B is placed in pressure contact with a push switch serving as the pressure sensor 1 and is pressed down. Note that the symbols α, 18A, 31, etc. described in FIG. 9 etc. will be explained later.

As described above, in this embodiment, since the pressure sensor 1 (push switch) is arranged on the lower surface 12B side of the cushion pad 12, the outer skin 13 of the seat 10 is placed on the buttocks and thighs of the occupant seated on the seat 10. The pressure sensor 1 will not come into contact with the device through the device.
When the pressure sensor is placed between the cushion pad 12 and the outer skin 13 of the seat cushion 11 (i.e., just below the outer skin 13) as in the conventional case described above, the pressure sensor is placed between the buttocks and thighs of the occupant seated on the seat 10. In some cases, the occupant feels that something is touching the surface of the seat 10 through the skin 13 of the seat 10, resulting in a poor sitting feeling. This makes it possible to improve the seating feeling of the driver.

In addition, in this embodiment, since the pressure sensor 1 is arranged at a position on the lower surface 12B side of the cushion pad 12 of the seat cushion 11 as shown in FIG. Pressure sensor 1 will now be pressed down accurately. Therefore, it becomes possible for the pressure sensor 1 to accurately detect that the occupant is seated on the seat 10.

On the other hand, when the load applied to the seat cushion 11 from the seated occupant is detected, as shown in FIG. The height is higher at positions shifted in the left-right direction than the position where the wire 19 is placed, and the height is highest at the portion where the right and left ischial tuberosities of the pelvis of a seated occupant come into contact.
Therefore, as in the present embodiment, the pressure sensor 1 is placed at a position avoiding the wire 19 located directly below the center line CL in the left-right direction of the seating area, and By arranging the seat cushion 11 at a position shifted from the center line CL in the left-right direction (see Fig. 10), it is possible to detect pressure at the position where the load applied to the seat cushion 11 is the highest, or at a position close to it, making it possible for the occupant to When a person is seated on the seat 10, it can be detected with high sensitivity and accurately.

Further, if the pressure sensor 1 is arranged above the wire 19, problems arise such as having to form a mounting portion 21 on the wire 19 to which the pressure sensor 1 is attached. On the other hand, as in the present embodiment, the pressure sensor 1 is mounted at a position avoiding the wire 19, specifically at a position shifted to the left and right from the wire 19, or at a position symmetrical to the wire 19. By providing the section 21 and arranging the pressure sensor 1 on the left and right sides of the wire 19, it becomes possible to arrange the pressure sensor 1 in the left and right pan frame 18 parts avoiding the wire 19, and as described above. This makes it possible to avoid such problems.

As described above, according to the arrangement structure of the pressure sensor 1 on the seat 10 according to the present embodiment, it is possible to accurately detect that the occupant is seated on the seat 10, and to improve the seating feeling of the occupant. It becomes possible to aim for improvement.
Further, in the arrangement structure of the pressure sensor 1 on the seat 10 according to the present embodiment, the pressure sensor 1 is arranged as in the present embodiment, compared to the case where the pressure sensor 1 is arranged above the wire 19. 1. The degree of freedom in layout is improved.
There are also effects like this.

By the way, as shown in FIG. 11, for example, if the cushion pad 12 above the pressure sensor 1 is provided with a hollow section such as the air passage 30 (see FIG. 2) for the air (hot air or cold air) described above. When an occupant sits on the seat 10, the portion of the cushion pad 12 above the hollow portion bends downward and absorbs the load, making it difficult for the load to be transmitted to the portion below the hollow portion. Therefore, it may be difficult for the pressure sensor 1 to transmit the load to the pressure sensor 1, making it difficult for the pressure sensor 1 to detect that an occupant is seated on the seat 10.
Therefore, it is desirable that the pressure sensor 1 be provided at a position other than directly below the hollow portion, such as the ventilation passage 30, formed in the cushion pad 12.

In addition, in order to ensure that when an occupant sits on the seat 10, the load is more reliably transmitted to the pressure sensor 1 via the cushion pad 12 (that is, the cushion pad 12 is connected to the cover 1A of the pressure sensor 1 (see FIG. 5)). For example, the portion α of the lower surface 12B of the cushion pad 12 above the pressure sensor 1 (see FIG. 9) may be made harder than other portions of the cushion pad 12. It is possible to configure
Further, although not shown in the drawings, it is also possible to provide the above-mentioned portion α with a convex portion that protrudes toward the pressure sensor 1 on the lower side.

On the other hand, it is also possible to configure the seat 10 so that when a bag or other baggage is placed on the seat 10, it is not mistakenly detected as a passenger sitting on the seat 10.
Luggage such as bags usually weighs less than the passenger. Therefore, the deflection of the cushion pad 12 is smaller when luggage such as a bag is placed on the seat 10 than when an occupant is seated on the seat 10.

Therefore, for example, as shown in FIG. 12, it is also possible to provide a concave portion 12C in the portion α of the lower surface 12B of the cushion pad 12 above the pressure sensor 1.
With this configuration, when baggage such as a bag is placed on the seat 10, the cushion pad 12 is not bent so much that the cushion pad 12 does not touch the pressure sensor 1 or the cover 1A of the pressure sensor 1 is placed on the seat 10. The pressing pressure is weak. Therefore, with the above configuration, the pressure sensor 1 does not perform a detection operation, and it is possible to prevent erroneous detection that the occupant is seated.

Further, with the above configuration, when an occupant sits on the seat 10, the cushion pad 12 is largely bent, and the upper surface β of the recess 12C touches the pressure sensor 1, pushing down the cover 1A of the pressure sensor 1. Therefore, when an occupant is seated on the seat 10, it is possible to accurately detect this using the pressure sensor.
Note that even in the case of the above configuration, the upper surface β of the recess 12C is made hard, or a convex portion that protrudes downward (that is, toward the pressure sensor 1) is provided on the upper surface β of the recess 12C. It is also possible to configure such a configuration that it is possible to reliably detect when a person is seated on the seat 10.

Further, in this embodiment, as shown in FIGS. 7A and 7B, only one pressure sensor 1 is disposed in one of the attachment parts 21 provided in the recess 20 of the pan frame 18. Although the case has been described, it is also possible to arrange a plurality of pressure sensors 1, as shown in FIG. 13, for example.
That is, it is also possible to arrange the pressure sensor 1 at two positions shifted to the left and right from the wire 19 and the center line CL of the seating area R in the left-right direction.

With this configuration, it is possible to improve the sensitivity of the pressure sensor 1 in detecting the occupant's seating more than when only one pressure sensor 1 is disposed.
In addition, by arranging a plurality of pressure sensors 1 with different detection sensitivities such as different load thresholds, it is possible to solve the problem by arranging a plurality of pressure sensors 1 with different detection sensitivities such as different load thresholds, for example, when a bag or other baggage is placed on the seat 10 and when an occupant is seated on the seat 10. It becomes possible to reliably detect that an occupant is seated on the seat 10, such as by being able to distinguish between the two.

By the way, in the seat 10 of this embodiment, as shown in FIG. 2, a ventilation passage 30 is provided in the cushion pad 12 of the seat cushion 11, and as shown in FIG. Air is sent from a blower (not shown) provided through the duct 31 into the ventilation path 30 through the through hole 30B.
Therefore, in this embodiment, as shown in FIGS. 4 and 9, the pan frame 18 is provided with an opening 18A that is a through hole through which the duct 31 and the like pass.

Further, since the blower is usually provided on either the left or right side of the seat 10, the position where the duct 31 passes through the pan frame 18 is also to the left or to the right of the center depending on the position of the blower. Therefore, in the sheet 10 of this embodiment, in order to cope with any of these cases, as shown in FIGS. are provided at two locations, one on the left side and one on the right side of the pan frame 18. An opening 18A may further be provided.

In this embodiment, as shown in FIGS. 7(A) and 7(B), openings 18A are provided on the left and right sides of the recess 20, continuous with the recess 20 of the pan frame 18 in which the attachment portion 21 is provided. It is provided.
Therefore, when the pressure sensor 1 is attached to the attachment part 21, the connector part 2 of the pressure sensor 1 protrudes into the opening 18A, as shown in FIGS. 7(A) and 7(B), and is connected to the connector part 2. It becomes possible to easily route the attached harness etc. (not shown) to the lower side of the pan frame 18 through the opening 18A.

Further, if there is a distance between the mounting part 21 and the opening 18A, the harness etc. attached to the connector part 2 of the pressure sensor 1 attached to the mounting part 21 will be attached to the pan frame 18 until the opening 18A. In this state, the harness or the like rubs against the pan frame 18 or the cushion pad 12, and there is a possibility that the harness or the like is damaged or disconnected. However, as described above, if the opening 18A is provided continuously to the recess 20 of the pan frame 18 in which the mounting portion 21 is provided, the above-mentioned rubbing is less likely to occur, and damage to the harness etc. Disconnection, etc. is less likely to occur.

Further, as shown in FIG. 4, the duct 31 is inserted into any one of the plurality of openings 18A. Therefore, for example, if the pressure sensor 1 is attached to the mounting part 21 on the side of the opening 18A through which the duct 31 is not inserted, the duct 31 can be inserted through the harness etc. connected to the connector part 2 of the pressure sensor 1. It is possible to pass through the opening 18A that is not provided.
Therefore, with this configuration, the harness etc. and the duct 31 do not interfere with each other, and the harness etc. and the duct 31 do not rub against each other, making it difficult for the harness etc. to be damaged or disconnected. Note that it is also possible to configure the harness or the like to be inserted through the opening 18A through which the duct 31 is inserted.

Further, with the above configuration, there is no need to newly provide an opening 18A in the pan frame 18 for passing the harness etc. connected to the connector part 2 of the pressure sensor 1, and it is not necessary to newly provide the opening 18A for passing the harness etc. connected to the connector part 2 of the pressure sensor 1. There is also an advantage that it becomes possible to pass a harness or the like connected to the connector part 2 of the pressure sensor 1 by utilizing the opening 18A already formed in the pan frame 18, such as the opening 18A.

It goes without saying that the present invention is not limited to the above-described embodiments and modifications, and can be modified as appropriate without departing from the spirit of the present invention.

1 Pressure sensor 3 Convex part (structure for engagement)
10 Seat 12 Cushion pad 12B Lower surface 19 Wire 21 Mounting part 22 Hole (structure for engagement)
CL Center line R in the left and right direction of the seating area Seating area

Claims (1)

In the arrangement structure of a pressure sensor on a seat equipped with a cushion pad,
The pressure sensor is
Consists of a push switch,
a position on the lower surface side of the cushion pad, where the lower surface of the cushion pad comes into pressure contact with the push switch and presses it down when an occupant is seated on the seat;
A structure for arranging a pressure sensor on a seat, characterized in that the pressure sensor is disposed in the center of the seat in the left-right direction and avoids a wire extending in the front-rear direction.

Images