JPS6317704Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a seat that can automatically adjust the damping characteristics of the seat to be large or small according to the frequency of relative vibration between the axle side and the vehicle body side in an automobile, and under any vibration condition. The aim is to provide a comfortable ride at all times.

Conventional seats have a constant damping characteristic. As shown in FIG. 5, if the horizontal axis is the frequency of the relative vibration between the axle side and the body side, and the vertical axis is the damping ratio (acceleration transmission rate), when the damping characteristic is small, the characteristic will be as shown by curve A. At the resonance point of 3 to 4 Hz, the seat becomes too soft and the ride becomes uncomfortable, but at around 6 Hz, which is the resonance point of the human internal organs,
This is ideal as no vibrations are transmitted, but if the damping characteristics are large, the characteristics will be as shown in curve B, and at around 3 to 4 Hz the damping ratio, i.e. the acceleration transmission rate, will be lower than curve A, so the seat will not feel too soft and the ride will be more comfortable. However, at around 6 Hz the damping ratio, i.e. the acceleration transmission rate, will be higher than curve A, so there will be a larger rough feeling in the stomach and the ride will be less comfortable.

Therefore, it is preferable to use a sheet with damping characteristics that exhibits a behavior as shown in curve B at around 3 to 4 Hz and as shown in curve A at around 6 Hz.

The present invention provides a sheet with the above-mentioned preferable damping characteristics by adopting the configuration described in the claims of the utility model registration.

The configuration of the illustrated example will be explained below.

In FIG. 1, a fixing plate 3 is fixed to the upper surface of the lower seat rail 2 on which the seat cushion 1 is seated, and the fixing plate 3 has a plurality of holes 4 communicating with the floor surface. It has been established.

On the other hand, a sliding plate 6 is attached to the lower surface of the seat cushion 1 so as to be slidable in the front-back direction with respect to the seat cushion frame 5, and is overlapped with the fixed plate 3.

This sliding plate 6 is provided with a plurality of holes 7 having the same diameter as the hole 4 or smaller in diameter at the same phase position as the hole 4 of the fixed plate 3. It communicates with the interior 8 of the cushion 1.

A rack rod 9 extends from this sliding plate 6 and is meshed with a pinion 10 connected to a motor M, so that the holes 4 and 7 are completely connected, as shown in FIG. 3a. The sliding plate 6 is configured to be able to slide from the misaligned position in the direction shown in the state shown in FIG. , this rack rod 9, motor M, pinion 10, etc. constitute an example of a sliding drive device.

Furthermore, a displacement meter 11 is attached to the sliding plate 6 to detect the sliding position with respect to the fixed plate 3. This displacement meter 11 has a structure in which an internal electrode 13 fixed to the sliding plate 6 is inserted into an external electrode 12 fixed to the lower seat rail 2 side.
The capacitance changes depending on the amount of penetration into the external electrode 12 of 3, and a corresponding voltage is obtained, and the capacitance changes continuously for each state of a, b, and c in Fig. 3. A voltage that changes as follows is obtained.

On the other hand, as shown in FIGS. 1 and 4, an induction coil 15 is disposed on the axle 14 side, and a rod-shaped permanent magnet 16 inserted into the coil 15 is fixed to the vehicle body 17 side. The induction coil 15 adjusts the frequency of the relative vibration between the axle and the vehicle body due to vibrations during driving according to the moving speed of a rod-shaped permanent magnet 16 fixed to the vehicle body 17, which is proportional to the frequency of the relative vibration between the axle and the vehicle body.
The structure is such that it can be extracted as an induced voltage. This induction coil 15 and a rod-shaped permanent magnet 16
constitutes a kind of position detector 18.

In the present invention, the displacement meter 11 and the position detector 18
By amplifying the voltage difference between the two with the amplifier 19 and driving the motor M, the sliding drive device consisting of the rack rod 9, the motor M, the pinion 10, etc. is operated, and the sliding movement against the fixed plate 3 is activated. Board 6
The desired damping characteristics are obtained by changing the position of the damping characteristics.

That is, when the fixing plate 3 and the sliding plate 6 have their holes 4 and 7 completely in conflict with each other as shown in FIG. When intense vibrations are transmitted to the side and the vehicle body 17 side, the motor M is driven according to the voltage difference between the displacement meter 11 and the position detector 18, and the sliding plate 6 is caused to open the hole 7 as shown in FIG. As shown in FIGS. b or c, it is slid so as to overlap the hole 4 of the fixing plate 3, and is stopped at the position where the voltage difference becomes zero. On the other hand, if the vibration frequency between the axle 14 side and the vehicle body 17 side is made small in a state where the holes 4 and 7 overlap and the damping characteristic is made small, as shown in FIG. 3c, Similarly, based on the voltage difference, the sliding plate 6 is slid and the holes 4 and 7 are brought into the state shown in FIG. 3b or a.

The present invention has the configuration and operation described above, and the seat cushion is of an air damping type, and the portion where the inside of the cushion communicates with the atmosphere is
Opening and closing occurs due to overlap or discrepancy between a hole in a fixed plate fixed to the lower seat rail side that is fixed to the vehicle floor and a hole in a sliding plate attached to the seat cushion side. , the position of the sliding plate with respect to the fixed plate is taken out as a voltage, and the frequency of the relative vibration between the axle side and the car body side is also taken out as a voltage, and when the frequency of the relative vibration is high due to the difference between the two voltages, the hole By increasing the overlap between the holes, and when the frequency is low, the sliding plate is slid so that the holes are in conflict with each other, and the damping characteristics of the seat cushion are automatically adjusted to large or small, so that the vibration state is always maintained. This has the effect of providing good ride comfort in accordance with the vehicle.

[Brief explanation of the drawing]

Figure 1 is a schematic vertical sectional view of one example of implementation, Figure 2 is a plan view showing the overlapping state of the fixed plate and the sliding plate, and Figures 3a, 3b, and 3c are the fixed plate and the sliding plate. FIG. 4 is a schematic side view of the displacement meter provided between the axle side and the vehicle body side, and FIG. 5 is the damping characteristic line. It is a diagram. 1...Seat cushion, 2...Lower seat rail, 3...Fixing plate, 4...Hole of fixing plate, 5...
...Seat cushion frame, 6...Sliding plate, 7
. . . Hole of sliding plate, 11 . . . Displacement meter, 14 .
Pinion, M...Motor.

Claims (1)

[Scope of utility model registration request] A sliding plate that is slidably attached to the lower surface of the seat cushion is stacked on a fixed plate that is fixed to the lower seat rail side and has a plurality of holes. A plurality of holes are provided in the same phase as the holes in the fixing plate, the holes have at least the same diameter as the holes, and communicate with the inside of the seat cushion, and the sliding plate has holes in the fixing plate. A sliding drive device that slides the sliding plate in a direction that overlaps or deviates from the holes in the sliding plate, and generates a voltage proportional to the sliding position of the sliding plate. On the other hand, between the axle side and the vehicle body side, a voltage is generated proportional to the change in position to detect the frequency of the relative vibration caused by the vibration of both. 1. A seat capable of automatically adjusting damping characteristics, characterized in that a position detector is provided to detect the position, and the sliding drive device is actuated based on a difference in voltage generated between the displacement meter and the position detector.