JPH0360347A - Motor device - Google Patents

Abstract

PURPOSE:To diminish the pressure of an elastic member for pressing a rotary shaft, and reduce the ununiformity of the pressure, and improve the abrasion resistance of the elastic member by arranging an elastic member and an abrasion resistance member for pressing in one direction along the axial direction. CONSTITUTION:On a frame 5, a stator 4 for retaining a coil 3 is fixed, and by bearings 6, 7, the rotary shaft 1 of a motor device is rotatably supported. On the stator 4, a plate spring 8 for pressing the rotary shaft 1 in the axial direction is fixed. By the elastic force of the plate spring 8, the rotary shaft 1 is pushed against the pivot bearing 7 via a ball 10. The section of the plate spring 8 in contact with the rotatable ball 10 is provided with the chip plate 9 of the abrasion resistance member of high hardness. As a result, the ununiformity of the pressure of an elastic member and the plate spring for pressing the rotary shaft is reduced, and the performance of the motor device is uniformed, and durability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application 1] The present invention relates to a motor device, and more particularly to a motor device provided with an elastic member that presses a rotating shaft in one direction along its axial direction.

[Prior Art] An example of a conventional motor device of this type is shown in FIG. 16. In this motor device, a rotary shaft l rotatably supported by an oil-impregnated bearing 6 and a pivot bearing 7 against a frame 5 of the device is pushed toward the left in the figure by a leaf spring 8 via a ball IO, and a ball 11 is The rotating shaft l is pressed against the ball 7a of the pivot bearing 7 through the pivot bearing 7.

In such a structure, the pressing force of the leaf spring 8 against the rotating shaft 1 is an ff1f factor that determines the performance of the motor device. That is, since this pressing force affects the durability, driving noise, generated torque, etc. of the motor device, it is necessary to reduce the variation in this pressing force in order to keep the performance of the motor device constant.

[Problem to be Solved by the Invention 1] In order to reduce the variation in the pressing force of the leaf spring 8 with the structure shown in FIG.
It is necessary to improve the dimensional accuracy of each part of the motor device in the horizontal direction in the diagram. But this has its limits.

Therefore, there is a method of reducing the spring constant of the leaf spring 8 in order to reduce the variation in the pressing force. But then,
A leaf spring material with a small spring constant is thin or soft, and the leaf spring 8 is easily worn out by the rotation and sliding of the ball IO, making it impossible to satisfy the durability of the motor device.

Therefore, an object of the present invention is to reduce the pressure force of the elastic member that presses the rotating shaft in this type of motor device to reduce its variation, and to improve the wear resistance of the elastic member.
The goal is to make it possible.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a motor device provided with an elastic member that presses a single rotation shaft in one direction along its axial direction. The crosspiece has a structure in which a wear-resistant member is provided at the portion that presses the rotating shaft.

Further, according to the present invention, in a motor device provided with a leaf spring that presses a rotating shaft in one direction along the axial direction, a portion that elastically biases a portion of the leaf spring that presses the rotating shaft. A structure in which the thickness of the press part was formed to be thinner than that of the pressing part was used.

[Function 1] According to the former structure described above, wear of the elastic member can be prevented by the wear-resistant member, and the pressing force can be reduced by reducing the spring constant of the elastic member without taking into account the wear resistance of the elastic member itself. Variations can be reduced.

According to the latter structure, the thickness of the part that elastically biases the part that presses the rotation axis of the leaf spring is made thinner than the suppressing part, thereby substantially reducing the spring constant of the leaf spring. The variation in the pressing force can be reduced. In addition, the wear resistance of the leaf spring can be improved by making the portion of the leaf spring that presses the rotating shaft relatively thick.

[Example 1 Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

First Embodiment FIGS. 1 to 4 illustrate the structure of a motor device according to a first embodiment of the present invention.6 FIG. 1 shows a cross section of the entire motor device. In the figure, reference numeral 5 denotes a frame of the motor device, which has a substantially U-shaped cross section. A stator 4 holding a coil 3 is fixed to the right side of the frame 5 in the figure.

Further, a pivot bearing 7 and an oil-impregnated bearing 6 are fixed to each of the opposite left and right end portions of the frame 5, and a rotating shaft l of the motor device is rotatably supported by the bearings 6.7. The rotating shaft l is here configured as a lead screw with a helical groove cut on the left side in the figure. In addition, a magnet 2 as a rotor is press-fitted and glued to the right end of the rotating shaft 1 in the figure, and the magnet 2 is attached to the stator 4.
It is loosely fitted inside.

On the other hand, a plate spring 8 for pressing the rotating shaft l in the left direction in the drawing is fixed to the right end of the stator 4 by adhesive or welding, and is arranged to face the rotating shaft l. The details of the structure of the leaf spring 8 are shown in FIGS. 2 to 4. 2 is a front view of the leaf spring 8 seen from the direction of arrow Z in FIG. 1, FIG. 3 is a side view of the leaf spring 8, and FIG. 4 is a cross-sectional view taken along the line AA in FIG. 2.

As shown in FIGS. 2 to 4, the leaf spring 8 is formed in a circular shape, and a U-shaped tongue portion 8a is cut and raised in the center parallel to the main body portion of the leaf spring 8. The other end of the tongue portion 8a is bent into a dogleg shape. And the rotation axis l of the tongue part 8a
A circular chip plate 9, which is a wear-resistant member that prevents wear of the plate spring 8, is adhered to the center of the entire plate spring 8 with an adhesive 12 at the center of the surface facing the plate spring 8. Here, the leaf spring 8 is made of a material 1 with a low spring constant, such as phosphor't'T$4.
The chip plate 9 is made of a material with high hardness <i- and excellent abrasion resistance, such as a hardened steel plate.

As shown in FIG. 1, such a leaf spring 8 with a chip plate 9 is arranged so that the chip plate 9 directly faces the right end of the rotation axis l in the figure. A ball IO is sandwiched between the chip plate 9 and the right end of the rotating shaft l in the figure.

A recess 1a is formed at the right end of the rotating shaft l to hold the ball IO. 6 Grease (not shown) is applied to the ball IO in order to prevent wear of the ball 10 or the chip plate 9 due to rotation and sliding. is coated. For this reason, the adhesive 12 used to bond the chip plate 9 to the leaf spring 8 is one that does not affect the above-mentioned grease or is not affected by the grease.

The elastic force of the leaf spring 8 pushes the rotating shaft 1 to the left in the figure along its axial direction via the ball IO, and pushes it against the pivot bearing 7. However, there is a ball 11 between the left end of the rotation axis l in the figure and the ball 7a of the pivot bearing 7.
are sandwiched between them, and the rotating shaft 1 is pressed against the pivot bearing 7 via the ball 11. In order to hold the ball 11, a recess 1b is formed at the left end of the rotating shaft 1 in the figure.

Under such a structure, when the motor device is driven, the coil 3 is energized, the coil 3 is excited, and the magnet 2 is energized.
A magnetic force acts on the magnet 2, and the rotating shaft l rotates together with the magnet 2.

According to the structure of the motor device of this embodiment as described above,
The amount of deflection of the leaf spring 8 differs due to variations in the dimensions of each part in the left-right direction in FIG. , the variation in the pressing force due to the difference in the amount of deflection is small, and therefore the performance of the motor device can be made uniform.

Further, in this embodiment, the ball 1 is in contact with the ball lO of the leaf spring 8.
Since a chip plate 9, which is a hard and wear-resistant member, is provided at the part that rotates and slides to the zero position, this chip plate 9 prevents the leaf spring 8 from being worn out and improves the durability of the motor device. .

By the way, the structure of the leaf spring 8 of the motor device described above is not limited to that described above, and other embodiments of the leaf spring 8 will be described below. In each figure of these embodiments, parts that are common or correspond to those in FIGS. 2 to 4 of the first embodiment are given the same reference numerals, and a description of the common parts will be omitted.

Second Embodiment FIGS. 5 to 7 explain the structure of a leaf spring 8 that presses the rotating shaft of a motor device according to a second embodiment of the present invention.

As shown in FIGS. 5 to 7, this embodiment differs from the first example in that the chip plate 9 is fixed to the tongue portion 8a of the leaf spring 8 by caulking. That is, the chip plate 9 is provided with legs 9a, and the tongue portion 8a is formed with a hole 8b, and the chip plate 9 is fixed to the tongue portion 8a by inserting the foot 9a into the hole 8b and caulking. There is.

According to such a structure, since no adhesive is used to fix the chip plate 9 compared to the first embodiment, there is no need to consider the effects of the above-mentioned adhesive and wear-prevention grease on each other. This has the advantage of widening the range of grease choices.

Third Embodiment Next, FIGS. 8 to 10 show the structure of a leaf spring according to a third embodiment.

As shown in FIGS. 8 to 10, in this embodiment, the leaf spring 8
A circular recess 8c is formed in the center of the tongue 8a. The chip plate 9 is placed in the recess 8c, and is held between the plate spring 8 and the ball 10 shown in FIG. 1 by the pressing force of the plate spring 8.

That is, in this embodiment, the depth plate 9 is held using the pressing force of the leaf spring 8, and there is no need for adhesives, caulking, etc. for fixing the chip plate 9. Further, the recessed portion 8c of the leaf spring 8 serves as a grease reservoir for storing grease in the ball 10 portion shown in FIG. 1, and in this respect, wear can be more effectively prevented and the durability of the motor device can be improved.

Fourth Embodiment Figures 1 to 13 show the structure of a leaf spring according to the fourth embodiment.

As shown in FIGS. 11 to 13, in this embodiment, the chip plate 9 is fixed to the tongue portion 8a of the leaf spring 8 with an embedded/V. This is done using a press.

According to such a structure, the same efficiency as in the first embodiment can be obtained (
In addition, there is an advantage that the unevenness of the leaf spring 8 due to the chip plate 9 is eliminated, and workability during assembly of the motor device is improved.

Fifth Embodiment FIGS. 14 and 15 illustrate the structure of a leaf spring according to the fifth embodiment.

As shown in FIGS. 14 and 15, the chip plate 9 is not used in this embodiment. In this embodiment, the proximal end portion of the tongue portion 8a of the leaf spring 8 that is bent in a dogleg shape and the portion near the thigh end portion of the tongue portion 8a in the body portion of the leaf spring 8, that is, the tongue portion that presses the rotating shaft. A portion 8d that elastically biases the tip side portion of 8a is made thinner than other portions of the leaf spring 8, and the spring constant of this portion 8d is further reduced by heat treatment. The thinning of this portion 8d is performed by pressing.

According to such a structure, the spring constant of the leaf spring 8 can be substantially reduced by the portion 8d having a small spring constant, and the thickness of the tip side portion of the tongue portion 8a that presses the shaft of one rotation can be made relatively thick. This can improve the wear resistance of this part. Further, according to this embodiment, since no chip board is used, the number of parts can be reduced and costs can be reduced. Note that it is also possible to combine the structure of this embodiment with the structures of other embodiments.

[Effects of the Invention] As is clear from the above description, the present invention provides a motor device provided with an elastic member that presses a rotating shaft in one direction along its axial direction.

In the motor device, the motor device is provided with a structure in which a wear-resistant member is provided in a portion of the elastic member that presses the rotating shaft, and a plate spring that presses the rotating shaft in one direction along the axial direction of the elastic member. Since the crosspiece has a structure in which the thickness of the part that elastically biases the part that presses the rotating shaft is thinner than the pressing part, variations in the pressing force of the elastic member or leaf spring that presses the rotating shaft can be reduced. In this way, the performance of the motor device can be made uniform, and the durability of the motor device can be improved by improving the wear resistance of the elastic member or the leaf spring.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the overall structure of a motor device according to a first embodiment of the present invention, FIG. 2 is a front view showing the structure of the leaf spring in FIG. 1, and FIG. 3 is a measurement diagram of the same leaf spring. 4 is a sectional view taken along line A-A in FIG. 2, FIG. 5 is a front view of the leaf spring according to the second embodiment, FIG. 6 is a side view of the same leaf spring, and FIG. 5 is a sectional view taken along the line 11-B in FIG. 5, FIG. 8 is a front view of the leaf spring according to the third embodiment, and FIG. 9 is a side view of the same leaf spring. 10 is a sectional view taken along the line CC in FIG. 8, FIG. 11 is a front view of the leaf spring according to the fourth embodiment, 1211 is a side view of the same leaf spring, and FIG. 13 is D in FIG. 11. -D! ! 14 is a front view of the leaf spring according to the fifth actual travel example, FIG. 15 is a sectional view taken along the E-E latitude in FIG. 14, and FIG.
The figure is a sectional view showing the structure of a conventional motor device. l-・-Rotating axis 2...-Magnet 3...-
Coil 4...Stator 5...Frame
6...-Oil-impregnated bearing 7...-Pivot bearing 8-
・-Plate spring 9-・-Chip plate io, tt...
Ball 12...Adhesive 4 Marano <□ key 513 = 11 enemy;] Rain <side of the afternoon (2) Fig. 2 Fig. 3 Heron 2 one A-A line back■ Crosspiece ζne σヱE2#ii 小] Wooden food No. 5 decoy 6th figure 5th B-B line @ surface (2) Non-existence l < Non-cr) Correct image Baka i 11th Graduation Figure 12 Figure 1111EIQD-Di Chin Senshu Kaisai Figure 13 Mine Higashi Baki's Work fD (2) Figure 14 躬 14-17) E-E Shinkei's 15th Factor 6 colors 8 of Cooperation and Subordination - Examination of Coupling Devices No. 16]

Claims (1)

[Claims] 1) In a motor device provided with an elastic member that presses a rotating shaft in one direction along its axial direction, a wear-resistant member is provided on a portion of the elastic member that presses the rotating shaft. A motor device characterized by: 2) In a motor device equipped with a leaf spring that presses a rotating shaft in one direction along its axial direction, the thickness of the portion of the leaf spring that elastically biases the portion that presses the rotating shaft is A motor device characterized by being formed thinner than a pressing part.