JPH03231040A - Power sheet - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to simplify the structure because a reduction gear is not needed by fixing plural ultrasonic motors to the front and rear portions of a sheet holding material, and connecting screw shafts driven by the ultrasonic motors to a sheet through elevating members. CONSTITUTION:Plural ultrasonic motors 2 are fixed to the front and rear portions of a holding material 1 fitted to the floor surface of a car body, and output rotating shafts thereof are fixed in such a manner as to align in the vertical direction. The upper ends of screw shafts 12 elevated by the respective ultrasonic motors 2 are connected to a sheet through elevating members 3. At this time, each ultrasonic motor 2 is constructed so that a hollow rotating shaft 9 is supported in a housing 2a fixed to the holding material 1 through bearings 10a, 10b, and a screw shaft 12 is screw-engaged with a thread groove 11 formed on the inner periphery of the hollow portion of the rotating shaft 9. By this arrangement, front and rear ultrasonic motors 2 are synchronously driven to elevate a sheet, and the ultrasonic motors of only one side are driven to tilt a sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power seat installed in an automobile or the like that can automatically raise, lower, or tilt the seat.

[Prior Art] Seats in automobiles, etc. can be raised, lowered, or tilted for ease of driving and comfort, and there are also seats called power seats that can be operated automatically. .

Conventional power seats, as described in Japanese Utility Model Application Publication No. 62-60435, have a DC motor placed below the seat, and the motor operates a link mechanism that connects multiple levers via a reduction gear. The seat is raised, lowered, or tilted.

[Problem to be Solved by the Invention J] Conventional power seats require a reduction gear because they use a DC motor as a power source, which has the disadvantage of complicating the structure and increasing the number of parts. Also, since it uses a speed reducer to drive, it makes noise when driving.
I couldn't say it was very desirable.

Therefore, the present invention uses an ultrasonic motor instead of a DC motor as the power source for the power seat, eliminating the need for reduced continuous shooting, and by making the link mechanism uniquely configured to be suitable for use with the ultrasonic motor. The purpose is to simplify the structure and eliminate the noise generated.

[Means for Solving the Problems] The present invention is a power seat that achieves the above object, which uses an ultrasonic motor with a hollow output rotating shaft and a screw thread on its inner periphery to hold the seat. The housings of the ultrasonic motors are fixed to the front and rear parts of the holding surface, respectively. A screw shaft is screwed onto the inner periphery of the rotating shaft of the ultrasonic motor, and the upper ends of the front and rear screw shafts are respectively connected to the bottom surface of the seat via elevating members.

Furthermore, in order to make the seat tiltable, one of the front and rear elevating members may be connected to the seat via a rail material having an elongated hole, and the other may be connected to the seat via a pivot support.

[Function] In order to raise and lower the seat in the power seat described above, if the front and rear ultrasonic motors are driven in synchronization, the hollow rotating shaft will not move up or down, so the screw shaft that is threaded with it will not move up or down. The seat is raised and lowered, and the seat is raised and lowered together with the raising and lowering member.

When tilting the seat, by driving one of the front and rear ultrasonic motors, the drive side of the seat moves up and down to tilt the seat (see FIG. 4). In this case, since the length between the front and rear elevating members changes, one elevating member moves along the elongated hole of the rail material.

[Example] An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

A holding member 1 for holding a seat is attached to the floor surface of an automobile body, and the holding member 1 is made by combining elongated brackets into a rectangular shape. Two ultrasonic motors 2 are fixed to the front and rear parts of the holding member 1 with an interval between them, and are arranged so that their output rotational axes are directed in the vertical direction. The upper end of the sukunoyu shaft, which is raised and lowered by the ultrasonic motor 2 as will be described later, is connected to the seat 4 via a long raising and lowering member 3.

The ultrasonic motor 2 has a housing 2a that is attached to the holding material l.
A disc-shaped stator 5 is attached to the upper part of the housing 2a. A piezoelectric material 6 is bonded to the upper surface of the stator 5, and a traveling wave is generated in the stator 5 by applying a high frequency voltage thereto, as is well known. A disk-shaped rotor 7 is arranged on the lower surface side of the stator 5, and is pressed against the stator 5 by a spring member 8 so as to be rotated by a traveling wave of the stator. The opposite side of the spring material 8 from the rotor side is fixed to a pressing plate IO protruding from the outer periphery of the rotating shaft 9, so that the rotor 7 and the rotating shaft 9 rotate together through the spring material 8. There is.

The rotating shaft 9 is formed hollow and passes through the center holes of the rotor 7 and the stator 5, and both ends of the rotating shaft 9 are held via bearings 10a and 1Ob fixed to the housing 2a. There is. A thread groove 11 is provided on the inner periphery of the hollow portion of the rotating shaft 9, and a screw shaft 12 is screwed into the inner periphery. A stopper 13 is provided at the lower end of the screw shaft 12 to restrict its upper limit position, and the upper end of the screw shaft 12 projects from the hollow rotating shaft 9 and is connected to the front or rear lifting member 3, respectively. Ru.

Cylindrical bearings 14 are provided at both ends of the front elevation member 3, and both bearings 14 are engaged with elongated holes 15a of rail members 15 attached to both sides of the bottom front portion of the seat 4.

The rail member 15 is guided by the engaging portion and can be moved slightly. Bearings 16 are also provided at both ends of the rear elevating member 3, and the bearings 16 are rotatably held by a seat mounting plate 17 attached to the rear portion of the seat bottom surface. As shown in FIG. 4, the seat 4 is tiltable using the bearing 16 as a fulcrum. The two ultrasonic motors at the front or the two ultrasonic motors at the rear can be driven synchronously, but the front and rear ultrasonic motors can also be driven separately. It is now possible to do so.

In the above embodiment, two ultrasonic motors are arranged at the front and rear of the seat, but the number is not limited to this. Alternatively, the front lifting member 3 may be connected to the seat 4 via a shaft support, and the rear lifting member 3 may be connected to the seat 4 via a rail member 15.

``Effects of the Invention'' By using an ultrasonic motor as a drive motor, the power seat of the present invention eliminates the need for a speed reducer, and also uses a unique link mechanism.

This makes it possible to reduce the number of parts and simplify the structure. In addition, since a speed reducer is not used, the noise generated during driving can be reduced, resulting in a power seat 1 with good operability.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the drive mechanism of the power sea I of the present invention;
Figure 2 is a cross-sectional view of the ultrasonic motor, Figure 3 is a partial side view of the power seat, and Figure 4 is an explanatory diagram showing the tilting operation state of the power seat.
;Ultrasonic motor 3: Lifting member 5;Stay's rotor 9;Rotating shaft screw/shirt 1-Rail member 15a;Long hole

Claims (2)

[Claims] (1) Ultrasonic motor housings with hollow output rotation shafts are fixed to the front and rear parts of the holding material that holds the sheet, and thread grooves are formed on the inner periphery of the output rotation shafts of each ultrasonic motor. A screw shaft is screwed into the thread groove of the rotating shaft of each ultrasonic motor, and the upper ends of the screw shafts at the front and rear portions are connected to the bottom surface of the seat via elevating members, respectively. Power seat. (2) According to claim (1), one of the front and rear lifting members is connected to the seat via a rail material having a long hole in the front-rear direction, and the other is connected to the seat via a pivot support. Power seat as described.