JPH10285862A - Support structure for rotator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure for a rotator, by which the rotator can be supported at low costs. SOLUTION: A stepping motor 3 for a control valve 1 is formed of a stator 5 and a rotor 6 which are fixed to a valve body 2, and the lower end part of the rotor 6 is supported by a bearing 21. A regulation member 22 is installed at the upper end of the rotor 6, and a conical recess 33 is formed in the regulation member 22. A spherical body 34 is held by the recess 33, and the spherical body 34 is urged downward by a leaf spring 36 on a shaft 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a rotor for supporting a rotor in a motor for driving a valve body of a control valve, for example.

[0002]

2. Description of the Related Art FIG. 4 is a view showing a conventional ACC valve 81. A valve body 82 forming a casing of the ACC valve 81 is provided with a stepping motor 83.

The stepping motor 83 includes a stator 86 having a plurality of coils 85,.
6 and each coil 8 of the stator 86
, A rotor 88 provided with a magnet 87 that rotates by switching the magnetic poles, and a shaft 89 provided integrally with the axis of the rotor 88. A valve body 91 that is screwed into a screw groove 90 formed at the lower end of the shaft 89 is provided.

The valve body 91 is screwed into the screw groove 90 of the shaft 89 and a base end member 96 fitted inside a cylindrical guide member 95 extending from the lower end of the valve body 82.
And a tip member 97 attached to the lower end of the base member 96 in a state of being fitted inside.
It is configured such that rotation is prevented when the guide member 95 is fitted inside. As a result, the rotor 88
When the shaft 89 rotates with the rotation of the valve body 91, the valve body 91 moves up and down without rotating.

A portion of the shaft 89 extending above the rotor 88 is supported by a valve body 82 via an upper bearing 101 and the rotor 88
The portion extending downward is supported by the valve body 82 via the lower bear link 102, and the shaft 8
9 and the rotor 88 are supported so as not to swing right and left with respect to the rotation axis. The shaft 89 is provided with a stopper pin 103 protruding laterally at a position above the base member 96 externally fitted to the shaft 89, and rotates the rotor 88 to a predetermined value or more. When the base member 96 is brought into contact with the stopper pin 103, the upward movement of the valve body 91 can be restricted. Further, the shaft 89 is provided with a retaining pin 104 protruding laterally at a position below the base end member 96 so as to protrude therefrom.
When the is rotated to a specified value or more, the lower end of the base end member 96 abuts on the retaining pin 104 so that the valve body 91 does not drop.

[0006]

However, the aforementioned A
In the CC valve 81, in order to support the rotor 88 rotatably and without lateral deflection, a shaft 89 integrally extending from the rotor 88 is vertically moved from the periphery thereof so as to sandwich the rotor 88. It was supported at the site. For this reason, expensive bearings must be provided between the shaft 89 and the valve body 82 at the upper and lower positions sandwiching the rotor 88, which is a factor of high cost.

[0007] The present invention has been made in view of such a conventional problem, and has as its object to provide a support structure for a rotating body capable of supporting the rotating body at low cost.

[0008]

According to the present invention, there is provided a rotating body supporting structure for rotatably supporting a rotating body which rotates about a rotating shaft. First supporting means for supporting the rotating body more,
And second support means for supporting the rotating body in the extending direction of the rotating shaft.

That is, the rotating body is supported from the periphery by the first supporting means and is supported by the second supporting means in the extending direction of the rotating shaft, so that the rotating body is centered on the first supporting means. Shaking of the rotating body is prevented by the second support means.

The second support means includes a concave portion provided on the rotating shaft of the rotating body, a sphere held in the concave portion, and a leaf spring for urging the sphere.

Thus, the rotating body is supported via the recess provided on the rotation shaft and the sphere held in the recess, and is urged by the leaf spring.

Preferably, the rotating body is a rotor constituting a rotating part of a motor.

Thus, the rotor affected by the magnetic force is supported from the periphery by the first support means, and is supported by the second support means in the extending direction of the rotating shaft.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a control valve 1 including a rotating body support structure according to the present embodiment.
A stepping motor 3 is provided on a valve body 2 forming a casing of the control valve 1.

The stepping motor 3 includes a stator 5 fixed to the valve body 2 and a rotor 6 surrounded by the stator 5. The stator 5 includes a plurality of stator coils 7,. The stator coil 7,.
Are excited so that the excitation state of the magnetic pole teeth 8,... Can be controlled by energizing the stator coils 7,. The rotor 6 includes a magnet 9 forming an outer peripheral portion.
And a cylindrical body 10 forming an inner peripheral portion, and the magnets are switched by switching the magnetic poles of the magnetic pole teeth 8,... Provided along the inner side surface of the stator 5. 9 receives a magnetic force, and the rotor 6
It is configured to rotate about 1.

In the rotor 6, the lower end of the cylindrical body 10 is provided with a bearing 21 as first supporting means.
The rotor 6 is supported by the valve body 2,
The bearing 21 is fixed rotatably from the surroundings. Further, the rotor 6 is supported by the valve body 2 via a regulating member 22 constituting a second supporting means provided at an upper end of the rotor 6, and the rotor 6 is The rotation shaft 22 supports the rotation shaft 11 so as to be rotatable from above in the extending direction.

That is, at the upper end of the rotor 6, the regulating member 22 which rotates together with the rotor 6 is provided integrally. As shown in FIGS. It comprises a regulating portion main body 25 formed in a cylindrical shape having the same dimensions as the rotor 6, and a reduced diameter portion 26 whose diameter is reduced upward from the regulating portion main body 25. The regulation part main body 2
5 is provided with an engagement projection 28 which is engaged with an engagement recess 27 formed on the upper end surface of the cylindrical body 10 of the rotor 6. A large-diameter hole 29 and a small-diameter hole 30 smaller in diameter than the large-diameter hole 29 are provided in the regulating portion main body 25 in order from the lower side around the rotation shaft 11. A communication hole 31 extending from the small diameter hole 30 to the upper end surface of the reduced diameter portion 26 is formed. At the upper end of the communication hole 31, the inner diameter is increased toward the upper end, and an inclined surface 3 is formed at the upper end of the communication hole 31.
A mortar-shaped recess 33 having a center 2 is formed around the rotation shaft 11. A spherical body 34 is rotatably held in the recess 33, and the center of the spherical body 34 is guided on the rotation shaft 11. This sphere 3
4 is a circular recess 35 provided at the upper end of the valve body 2.
The leaf spring 36 is supported by the valve body 2 and is configured to urge the regulating member 22 and the rotor 6 downward.

As shown in FIG. 4, the leaf spring 36 is formed of a disk-shaped member, and has a holding hole 41 for holding the sphere 34 at the center. Around the holding hole 41, cutouts 42,... Extending obliquely inward from the outer peripheral edge of the leaf spring 36 are formed at three places. Three supporting feet 43,... Are formed. As shown in FIGS. 1 and 5, each of the support feet 43,... Is bent upward from the base end toward the valve body 2, and the tip end thereof is a leaf spring 36.
It is bent in parallel to. Further, as shown in FIG. 4, projecting pieces 44,... Projecting laterally are provided at three places on the outer peripheral edge of the leaf spring 36.
The holding hole 41 is configured to be positioned at the center of the rotating shaft 11 in a state in which the holes 4 contact the side wall of the circular recess 35.

On the other hand, as shown in FIGS. 1 and 2, a male screw is formed on the inner surface of the cylindrical body 10 of the rotor 6, and a screw hole 51 is formed in the rotor 6 on the rotating shaft 11. Are formed. A shaft 52 is inserted into the screw hole 51, and a side surface of the shaft 52
A female screw 53 screwed into the male screw of the screw hole 51 is formed. A stopper pin 5 protruding laterally is provided at an upper end of the shaft 52 protruding above the rotor 6.
A valve body 55 is fixed to the lower end of the shaft 52 projecting downward from the rotor 6 (see FIG. 1). The valve body 55 is prevented from rotating in a state where an extension portion 56 extending upward from a base end thereof is inserted into a lower end portion of the valve body 2 so as to be able to be inserted and removed. When the rotation of the rotor 6 is controlled by controlling the energization of each of the stator coils 7,..., The rotor 6 is inserted into a screw hole 51 provided in the rotor 6 in a screwed state. The shaft 52,
And a valve element 55 provided at the lower end of the shaft 52.
It is configured to be able to move up and down.

The large-diameter hole 29 in the regulating member 22
As shown in FIG. 3, an upper contact portion 62 having a right-angled triangular cross section extending along the small-diameter hole 30 is projected from a step 61 between the small-diameter hole 30 and the small-diameter hole 30. Rotor 6
Is rotated, and when the shaft 52 moves upward,
The hanging surface 63 of the upper contact portion 62 is
The stopper pin 54 is configured to contact the side of the stopper pin 54 from the circumferential direction. Also, as shown in FIG. 2, when the rotor 6 is rotated and the shaft 52 moves downward, the upper end surface of the cylindrical body 10 of the rotor 6 is moved from the circumferential direction of the shaft 52 to the lower side. A lower abutting portion 64 having the same shape as the upper abutting portion 62 abutting on a side portion of the stopper pin 54 protrudes.

In this embodiment having the above-described structure, the rotor 6 of the stepping motor 3 provided in the valve body 2 has a lower end supported by a bearing 21 from the periphery and is integrally provided at an upper end. The regulating member 22 moves the spherical body 34 via the spherical body 34 held in the concave portion 33 of the regulating member 22 to the rotating shaft 1 of the rotor 6.
The rotating shaft 11 is supported by the leaf spring 36 which is maintained above the rotating shaft 1 in a state where the rotating shaft 11 is biased from above in the extending direction. For this reason, the lateral deflection of the rotor 6 above the bearing 21 can be prevented by the regulating member 22, the spherical body 34, and the leaf spring 36, so that two portions of the shaft extending from the rotor are provided. It is not necessary to use expensive bearings at two places on the shaft as in the conventional case having a structure for supporting the shaft from the periphery. This allows
The number of bearings that support the rotor 6 from the periphery can be reduced, and the rotor 6 can be supported at low cost without causing shaft runout.

In particular, in the stepping motor 3, the rotor 6 is provided with a stator 5 surrounding the rotor 6.
Of the magnetic pole teeth 8,... Are laterally applied at all times, and the rotor 6 is separated from the magnetic pole teeth 8,. The distance must be kept constant. Even under such limited conditions, the shaft runout of the rotor 6 can be prevented with a simpler structure than in the case where the bearings are provided at two places. It can be a structure.

The rotor 6 is urged downward by the leaf spring 36, and the urging force of the leaf spring 36 can be used as a braking force for the rotor 6. For this reason, in the stepping motor 3, an effect of converging the overshoot and the undershoot of the rotation angle of the rotor 6 during the pulse driving can be obtained, and the rotor 6 after the driving pulse is input.
Stabilization time can be shortened. As a result, the step-out limit frequency of the drive pulse can be increased, and the stepping motor 3 having excellent frequency characteristics can be formed.

[0024]

As described above, in the present invention,
Shaking of the rotating body supported from the periphery by the first supporting means can be prevented by the second supporting means supporting the rotating body in the extending direction of the rotating shaft. For this reason, since the two parts of the shaft extending from the rotor are supported from the periphery, respectively, the rotating body is surrounded by two parts of the shaft compared to the conventional case where expensive bearings had to be provided. The number of bearings to be supported can be reduced. Thereby, the rotating body can be supported at low cost.

Further, the second support means is constituted by a concave portion provided on the rotating shaft of the rotating body, a sphere held in the concave portion, and a leaf spring for urging the spherical body. Regarding, the rotating body, a recess provided on the rotation axis,
Further, the rotating body can be urged with a constant urging force because the rotator can be urged by the leaf spring via the sphere held in the concave portion. Therefore, the urging force can be used as a braking force when controlling the rotation of the rotating body.

In particular, when the rotating body is a rotor constituting a rotating portion of a motor, a magnetic attraction acts on the rotor from the side, so that shaft runout is likely to occur. However, by providing the above-described configuration, the shaft run-out can be reliably prevented, so that a rotating body supporting structure suitable for supporting the rotor in the motor can be obtained.

[0027]

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view showing a portion A in FIG. 1;

FIG. 3 is a partial cross-sectional view of the regulating member according to the embodiment as viewed obliquely from below.

FIG. 4 is a plan view showing a leaf spring according to the embodiment.

FIG. 5 is a view shown by an arrow B in FIG. 4;

FIG. 6 is a cross-sectional view showing a control valve having a conventional rotating body support structure.

[Explanation of symbols]

 Reference Signs List 3 stepping motor 5 stator 6 rotor 11 rotating shaft 21 bearing 22 regulating member 33 concave portion 34 sphere 36 leaf spring

Claims (3)

[Claims] 1. A supporting structure for a rotating body that rotatably supports a rotating body that rotates about a rotating shaft, wherein: first supporting means for supporting the rotating body from around the rotating body; And a second support means for supporting the rotating body in an extending direction, the rotating body supporting structure comprising: 2. The method according to claim 1, wherein the second supporting means includes a recess provided on the rotation axis of the rotating body, a sphere held in the recess, and a leaf spring for urging the sphere. The support structure for a rotating body according to claim 1, wherein 3. The rotating body support structure according to claim 1, wherein said rotating body is a rotor constituting a rotating portion of a motor.