JPH0717278Y2 - Vibration wave motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a vibration wave motor capable of pressing a rotor against a stator in a preferable state.

"Prior Art" A vibration wave motor has been proposed in which a rotor can be pressed against a stator in a preferable state by adjusting a screw provided on a circumferential portion via a ball bearing (for example, Japanese Utility Model Application No. 62-1133).
No. 13).

[Problems to be Solved by the Invention] In the conventional technology, it was difficult to adjust and balance the pressing force.

[Means for Solving the Problems] The present invention is to solve the above problems, and includes a main plate, a rotary shaft rotatably supported by bearings on the main plate, and an elastic vibrating body fixed to the main plate. And a circular stator composed of a piezoelectric element with an electrode that excites the same, a circular rotor that includes a slider that contacts the elastic vibrating body and is axially supported by a bearing, and a rotor that is fixed to one end of the rotating shaft via a cushioning material. From the leaf spring that presses the stator to the stator and the screw that presses the shaft center of the rotary shaft that is screwed with the upper base plate fixed to the ground plate and is fixed at the shaft center via the ball or pivot. A vibration wave motor is provided.

[Operation] According to the configuration of the present invention, the rotor is pressed against the stator with a uniform force by the leaf spring, and the pressing force is adjusted by the screw,
And it can be adjusted during the rotating operation of the motor.

[Examples] Examples will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a base plate, 2 is a rotating shaft, which is rotatably supported by a bearing 1a fixedly mounted on the base plate 1, and an output is taken out from this shaft. Reference numeral 3 denotes a stator having a piezoelectric element 3b attached to an elastic vibrating body 3a and fixed to the base plate 1 together with the bearing 1a by a supporting portion 3c. A slider 4a is attached to a surface of the rotor 4 which is in contact with the stator.
It is fixed to the rotary shaft 2 by 4b. 5 is a cushioning material made of cushion rubber or the like attached to the support portion 4, 6 is a disc-shaped leaf spring fixed to the rotary shaft 2 by caulking,
The rotor is pressed against the stator via the cushioning material 5 at the circumferential portion. A slit in the radial direction is provided if necessary. Reference numeral 8 denotes a screw for adjusting pressure, which is screwed to an upper base plate 9 fixed to the base plate 1 and presses the ball receiving portion 2a at the axial center of the rotary shaft 2 via the ball 7. 8a is a lid that closes the screw holes.

Next, the operation will be described. Since the operation of the vibration wave motor is well known, the description thereof will be omitted and only the part related to the present invention will be described. The screw 8 is adjusted to adjust the pressure of the rotor 4 against the stator 3. This adjustment can also be performed while the motor is rotating. The lid 8a may be a double screw with the screw 8 so as to prevent the screw 8 from loosening.

FIG. 2 shows another structure in which the shaft center portion of the rotating shaft is pressed by a screw, and the ball 27 and the pivot 22a arranged in a ring shape.
Connect with and.

FIG. 3 shows another embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 32 denotes a rotary shaft, which is not an output shaft in this embodiment, but it is clear that it can be used as an output shaft for multi-axis output. Reference numeral 38 denotes an upper base plate, which is fixed to the base plate 1 by a support shaft 39. Three or more support shafts 39 are planted in the base plate 1 in an annular shape. Reference numeral 40 denotes a gear for extracting the output, which is fixed to the rotating shaft 32 by caulking or other method. Reference numeral 41 is a gear that connects the output to a load, and is supported by a shaft 42 provided between the main plate 1 and the upper base plate 38. In these, the gear 41 may rotate with respect to the shaft 42, and
May be rotatable.

[Advantages of the Invention] According to the configuration of the present invention, the pressing force of the rotor against the stator is evenly applied even if the shaft vibration of the vibration wave motor is slight, and a smooth rotational force is efficiently output.
Further, the pressure can be easily adjusted during the rotation even when the resonance state of the rotor of the motor changes when a load is applied, so that the rotation can be optimized.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a schematic sectional view showing another embodiment of a part of the figure, and FIG. 3 is a schematic sectional view showing another embodiment of the present invention. 1 ... Main plate, 2 ... Rotating shaft, 3 ... Stator, 4 ... Rotor, 5
... cushioning material, 6 ... leaf spring, 7 ... ball, 9 ... upper base plate, 8 ...
screw

Claims (1)

[Scope of utility model registration request] 1. A circular shape comprising a base plate, a rotary shaft rotatably supported by the base plate via a bearing, an elastic vibrating body fixed to the base plate, and a piezoelectric element with an exciting electrode for exciting the elastic vibrating body. A circular rotor provided with the slider in contact with the elastic vibrating body and axially supported by the bearing, and a leaf spring fixed to one end of the rotating shaft to press the rotor against the stator via a cushioning material. A screw for pressing the shaft center portion of the rotary shaft to which the leaf spring is fixed via a ball or pivot at the shaft portion by screwing with an upper base plate fixed to the base plate. Characteristic vibration wave motor.