JP2002202150A - Rotary encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary encoder in which a cord member restricts the location of a speed nut and rotates in such a way as to describe an accurate circle with the rotation of a shaft. SOLUTION: The rotary encoder comprises a housing 10, a detecting element 15 mounted to the side of the housing 10, a rotor 20 provided with both a mounting hole 23a at the center through which the shaft 50 is inserted and the cord member 30 opposite to a detecting element 16 and rotatably held at the housing 10, and the speed nut 40 provided with a plurality of tongue pieces 42 capable of rigidly fitting over the outer circumference of the shaft 50. The speed nut 40 is rotatable with the shaft 50 and the rotor 20, and provided with a location restricting means for restricting movements between the rotor 20 and the speed nut 40 in the directions which intersect the axis of rotation of the rotor 20 at the right angles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary encoder used for detecting a rotation angle of a steering in a power steering of an automobile, and the like.
In particular, it relates to an internal mounting structure.

[0002]

2. Description of the Related Art A conventional rotary encoder R1 will be described with reference to FIGS. 9 to 11. FIG. 9 is a sectional view of a main part of the conventional rotary encoder, FIG. 10 is a plan view of a speed nut thereof, and FIG. It is a principal part expanded sectional view of the conventional rotary encoder.

A main body 100 to which the rotary encoder R1 is attached has a cylindrical portion 102 formed so as to protrude from a part of a wall portion 101 into a bottomed cylindrical shape. A bearing portion 103 composed of a ball bearing portion having the above balls is arranged. A circular through hole 104 is formed at the center of the side wall of the cylindrical portion 102.

The rotary encoder R1 has a housing 110 composed of a two-stage cylindrical portion, a shaft portion 120, a code plate 130 serving as a code member co-rotating with the shaft portion 120, and facing the code plate 130. And a speed nut 140 for holding the code plate 130 so as not to fall off from the shaft portion 120.

The housing 110 is formed to have a substantially convex cross section, an opening 111 formed in the side wall (upper in FIG. 9), and the open side of the cylindrical portion is formed on the main body 100 by appropriate means such as soldering.
Fixed to. A flat rectangular printed board 112 is attached to the opening 111 so as to protrude outward.
13 is attached in a state where it is connected to a detection circuit (not shown) and the like, and the Hall element 113 is located at the opening 111.

[0006] The shaft 120 is provided with a first shaft 12 having a large diameter.
1 and a second shaft portion 122 having a small diameter and projecting from one end of the first shaft portion 121. Then, the first shaft portion 121 is connected to the cylindrical portion 10.
The second shaft portion 122 is rotatably held by the bearing portion 103 while penetrating through the second through hole 104, and protrudes from the cylindrical portion 102 and is located inside the housing 110.

The code plate 130 is made of a disk-shaped permanent magnet, and has a through hole 131 at the center. The through hole 131 of the code plate 130 has the second shaft 1
22 is inserted in a loosely fitted state, and one surface of the code plate 130 abuts on the distal end surface of the first shaft portion 121 which is a step located at the boundary between the first and second shaft portions 121 and 122. In contact.

The speed nut 140 is made of a metal circular flat plate, and as shown in FIG.
41, three notches 142 provided on both sides, and three tongue pieces 143 formed to protrude from the base 141 to the center, and a circular through hole 144 formed at the center of the base 141. Speed nut 140 having such a configuration
Is firmly fitted to the second shaft 122, pressed against the other surface of the code plate 130, and
Is prevented from coming off. That is, the second hole is formed in the through hole 144.
The base 141 is inserted into the first shaft 121
Direction, the speed nut 140 and the first shaft 12
1, the code plate 130 is sandwiched.
At this time, the three tongue pieces 143 bend in the directions opposite to the pressing direction (leftward in FIG. 9), so that the second shaft 12
2 is firmly fitted. When the tongue piece 143 is tightly fitted in this way,
The speed nut 140 cannot move in the axial direction. As a result, the code plate 130 is prevented from coming off, and the speed nut 140 and the code plate 130 are
It turns around with 0.

At this time, since the second shaft portion 122 is loosely fitted into the through hole 131 of the code plate 130, as shown in FIG.
The center nut C2 of the shaft part 122 is shifted in the direction orthogonal to the axial direction by the speed nut 140,
The position between the second shaft portion 122 and the code plate 130 is determined.

Next, the operation of the conventional rotary encoder R1 will be described. When the shaft 120 rotates via a steering shaft (not shown), the code plate 130 rotates with the rotation. Then, the change of the magnetic pole is detected by the Hall element 113, and the code plate 130 is detected by a magnetic detection circuit (not shown) formed on the printed circuit board 112.
The detection pulse corresponding to the rotation of is detected. When the shaft 120 rotates with the center C1 of the through hole 131 and the center C2 of the second shaft 122 deviated from each other, the code plate 130 rotates in an ellipse, and a normal pulse cannot be detected. Also, since the value is different for each rotary encoder R1, there is a possibility that the rotation angle cannot be measured accurately.

[0011]

In the conventional rotary encoder R1 described above, the speed nut 140
Is fitted to the second shaft portion 122, and simply the code plate 13
Since the speed nut 140 and the code plate 130 are merely in contact with each other, the position of the speed nut 140 and the code plate 130 may be shifted. When the gap between the speed nut 140 and the code plate 130 occurs, the center positions C1 and C2 of the speed nut 140 and the code plate 130 are not determined, and when the shaft 120 is rotated, the code plate 130 becomes elliptical. They rotate as if drawn, and the performance deteriorates. In order to prevent this displacement, the through hole 131 of the code plate 130 and the second shaft 122
Attempting to manually correct the accuracy of the above has the problems of deteriorating mass productivity and increasing costs. In addition, there is also a problem that the cost is increased if the dimensional accuracy of both is increased.

The present invention has been made in view of such a problem, and provides a rotary encoder that regulates the position of a speed nut and rotates so that a cord member draws an accurate circle with the rotation of a shaft portion. The purpose is to do.

[0013]

Means for Solving the Problems As a first means for solving the above problems, a rotary encoder according to the present invention comprises: a housing; a detecting element attached to the housing;
A rotatable body rotatably held in the housing, provided with a code member facing the detection element, the rotatable body being provided with a mounting hole through which a shaft portion is inserted, and a plurality of tongue pieces; Has a speed nut that can be strongly fitted around the outer periphery of the shaft, and the speed nut is rotatable with the shaft and the rotating body, and is orthogonal to the rotation axis of the rotating body. And a position restricting means for restricting the movement between the rotating body and the speed nut in the direction of rotation.

As a second solution, the speed nut in the rotary encoder according to the present invention is provided with an engaging portion, and the engaging portion is engaged with the outer periphery of the rotating body to thereby restrict the position. Means are configured. Further, as a third solving means, in the rotary encoder according to the present invention, the engaging portion is formed by a cylindrical portion.

According to a fourth aspect of the present invention, in the rotary encoder according to the present invention, the rotating body has a base for holding the cord member and an outer diameter smaller than the outer diameter of the base. A locking portion protruding in the direction of the rotation axis of the rotating body, wherein the locking portion is constituted by a plurality of protrusions arranged on a cylinder or on the same circumference, and the locking portion is provided by the locking portion. It is configured to be locked to the part.

As a fifth solution, the tongue piece and the engaging portion of the speed nut in the rotary encoder according to the present invention are formed by a single metal plate. Further, as a sixth solving means, in the rotary encoder of the present invention, the rotating body has a caulking portion, and the speed nut is caulked to the caulking portion, thereby constituting the position regulating means.

As a seventh solution, the plurality of tongue pieces of the speed nut in the rotary encoder of the present invention are formed so as to face each other. According to an eighth aspect of the present invention, in the rotary encoder according to the present invention, the plurality of tongue pieces of the speed nut are adjacent to a first tongue piece with a notch from the first tongue piece, and A second tongue piece having a length smaller than that of the first tongue piece, and a circumferential region formed by connecting the tips of the second tongue piece is substantially the same as the outer diameter of the shaft portion The configuration was adopted.

According to a ninth aspect of the present invention, in the rotary encoder according to the present invention, a flange formed on the shaft is provided on a surface of the rotating body opposite to a side on which the speed nut is locked. Can be contacted.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary encoder according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIG.
FIG. 2 is a bottom view of the rotary encoder according to the first embodiment of the present invention, in which a shaft portion, a lower cover, and the like are removed, and FIG.
3 is a sectional view taken along line 3-3 of FIG. 1, FIG. 4 is a plan view of a speed nut according to the rotary encoder of the present invention, FIG. 5 is a sectional view taken along line 5-5 of FIG.
FIG. 6 is an enlarged sectional view of a main part for describing a mounting structure of a rotating body and a speed nut according to the rotary encoder of the present invention.

The housing 10 is made of a synthetic resin molded product.
It comprises a base 11 and a lower lid 12 made of a ring-shaped flat plate which is snap-coupled to the base 11. Base 1
1 includes a cylindrical storage portion 11a having a ring-shaped wall portion having a U-shaped cross section, and an elongated rectangular connector portion 11b connected to a side edge of the storage portion 11a and protruding outward. I have. The storage portion 11a includes an outer wall 11c having a large diameter, an inner wall 11d having a small diameter, and a flat wall portion 11e having a hole 11m in a central portion connecting the outer wall 11c and the inner wall 11d. It is configured. The inner wall 11d is shown in FIG.
As shown in FIG. 5, a concave portion 11k is formed by denting at two places on the outer wall 11c side. Also, the connector portion 11b has
The receiving portion 11f formed of a two-step rectangular recess is provided in the storage portion 1.
1a. In addition, a step portion 11g formed so as to expand toward the connector portion 11b is provided at a boundary between the storage portion 11a and the connector portion 11b.
A claw receiving hole 11h is provided at an edge of the outer side wall 11c. The lower lid 12 is formed of a ring-shaped flat plate made of a synthetic resin, has a central portion having a hole 12b recessed in a ring shape, and has an outer edge formed with a mounting leg 12a having a claw portion. The lower lid 12 is snap-fitted and fixed so as to cover the open side of the storage portion 11a. That is, the lower lid 12 is placed so as to fit into the inside of the outer wall 11c from the open side of the storage portion 11a, and the claw portion of the mounting leg 12a is
By engaging with h, a snap connection is made. When the lower lid 12 is snap-joined, a donut-shaped hollow portion 11i is formed between the lower lid 12 and the inner and outer walls 11d and 11c of the storage portion 11a, and the inner and lower portions of the inner wall 11d are formed. A recess 11j for storage is formed with the lid 12,
The upper and lower portions of the recess 11j are opened by holes 11m and 12b.

The printed board 13 is formed of a rigid fan-shaped and flat insulating board.
It has four terminals 14 bent at 0 degrees. Terminal 1
One end of 4 is soldered while penetrating the printed circuit board 13, and the other end protrudes into the receiving portion 11f.
As shown in FIGS. 1 and 3, a Hall element 15 as an elliptic detection element is vertically attached to the printed circuit board 13 by appropriate means such as soldering on the inner portion of the printed circuit board 13. I have. And the printed circuit board 13
Are mounted on the inner wall 11d and the step portion 11g, and the four terminals 14 embedded in the connector portion 11b are soldered and fixed in the hollow portion 11i of the storage portion 11a. As shown in FIGS. 1 and 3, the Hall element 15 is housed in the concave portion 11k of the inner wall 11d and is exposed to the concave portion 11j.

The rotating body 20 includes a ring-shaped base 21, a locking portion 22 integrally formed in a direction of a rotation axis G from an end face of the base 21, and a cylinder provided at the center of the base 21. And a cylindrical portion 23 having a cylindrical shape. The cylindrical portion 23 provided inside the base portion 21 has a mounting hole 23a.
Are formed, and an end of the cylindrical portion 23 is tapered in a mortar shape. The locking portion 22 is composed of a relatively low-height cylinder whose outer diameter is
Is smaller than the outer diameter of In the present embodiment, the locking portion 22 is formed of a cylinder. However, a plurality of protrusions formed on the same circumference, for example, two protrusions protruding in an arc shape having a relatively large angle, Three or more projections may be arranged at the same interval.

The cord member 30 is made of a permanent magnet such as a plastic magnet, has a substantially ring shape, and has a ring-shaped convex portion 30a formed on the upper and lower surfaces of the cord member 30. Such a cord member 30 is provided on the rotating body 20.
To the rotating body 20
It is united with. At this time, the cord member 30 is also locked by the projection 30a, so that the cord member 30 can be securely held on the rotating body 20 even when it is rotated at a high speed and a large centrifugal force is applied. Peeling of the rotating body 20 from the rotating body 30 can be prevented.

The rotating body 20 integrated with the cord member 30 is housed in the recess 11j of the casing 10 and faces the inner wall 11d. At this time, the rotating body 20 is positioned so that the code member 30 is at the same height as the Hall element 15, and a part of the code member 30 is, as shown in FIG. . The rotating body 20 integrated with the cord member 30 stored in such a state,
The change of the magnetic pole of the cord member 30 which is rotatable in the recess 11 j and rotates together with the rotating body 20
5 is to be read.

As shown in FIGS. 4 and 5, the speed nut 40 is formed of a single metal plate. The speed nut 40 has a base 40a in the form of a flat ring and extends downward from the outer peripheral edge of the base 40a. An engaging portion 41 formed of a bent cylindrical portion;
A plurality of first tongue pieces 42a cut and raised from the inner peripheral edge of the first tongue piece 0a and a plurality of second tongue pieces 42a extending from the base 40a toward the center while being located between the first tongue pieces 42a. It has a tongue piece 42b and two protruding pieces 43 that protrude in opposite directions from the outer periphery of the end of the engaging portion 41. The first tongue piece 42a is longer in the radial direction than the second tongue piece 42b, and the second tongue piece 42b is connected to the first tongue piece 42b.
a and the notch 40b are adjacent to each other, and the length of the first and second tongue pieces 4a is shorter than that of the first tongue piece 42a.
2a and 42b are formed alternately over 360 degrees. The first tongue pieces 42a face each other with the center of the base 40a interposed therebetween, that is, face each other toward the center. The second tongue piece 42b also has the center of the base 40a similarly. They are arranged to face each other with sandwiching them. Further, since the engaging portion 41 formed of a cylindrical portion is provided on the outer periphery of the base portion 40a, the strength of the base portion 40a is increased, and as a result, the first and second tongue pieces 42a, 42b are provided.
The notches 40b provided on both sides of the first tongue piece 42a can be formed deeply to a position near the engaging portion 41, the length of the first tongue piece 42a can be increased, and the outer diameter of the base 40a can be reduced.
The size of the speed nut 40 can be reduced. With such extension of the first tongue piece 42a, the spring strength of the first tongue piece 42a is reduced. Since the joint portion 41 is provided, the base portion 40a is prevented from floating,
As a result, a decrease in spring strength is suppressed. In addition, a line connecting the tips of the second tongue pieces 42b forms a circumferential area. In the present embodiment, a cylindrical portion is provided as the engaging portion 41. However, the engaging portion 41 is not necessarily required to be a cylindrical portion. Instead of the cylindrical portion, two arc-shaped side walls having a relatively large angle may be provided. More than one side wall may be provided on the same circumference. The speed nut 40 is manufactured by punching a single metal plate by press working to form an outer shape, and performing drawing to form an engaging portion 41 formed of a cylindrical portion.

The speed nut 4 having such a configuration
0 is integrated with the rotating body 20 by engaging the engaging portion 41 with the outer periphery of the locking portion 22 of the rotating body 20 as shown in FIG. That is, the speed nut 40 is securely fixed to the locking portion 22 by the engagement portion 41 being firmly fitted to the locking portion 22. By locking in this manner, the movement of the speed nut 40 between the speed nut 40 and the rotating body 20 in a direction orthogonal to the rotation axis G of the rotating body 20 is restricted. That is, the position restricting means is constituted by the engagement between the engaging portion 41 and the locking portion 22.

The shaft portion 50 is made of metal, and in this embodiment, is formed of sintered metal, and has a cylindrical base portion 51.
And a flange 52 formed of a disc-shaped flange integrally formed with the base 51. A through hole 50 a is formed at the center of the flange 52 so as to penetrate vertically from the base 51 to the flange 52. Such a shaft portion 50 is attached to the mounting hole 2 of the rotating body 20.
3a, the first tongue piece 42 of the speed nut 40
As a is bent, the first tongue piece 42a is firmly fitted to the first tongue piece 42a. That is, when the shaft portion 50 is inserted into the mounting hole 23a and reaches the speed nut 40, the second tongue piece 42b has a circumferential region formed by connecting its tip to the base 5 of the shaft portion 50.
1 and is formed so as to have at least a large diameter, so that it functions as the center of the shaft, and when the shaft portion 50 is further pushed in, the first tongue piece 42a is inserted in the insertion direction (in FIG. 2). (Upward) and is strongly fitted to the outer peripheral wall of the shaft portion 50. Then, it is pressed until the lower end surface of the rotating body 20 comes into contact with the flange 52. At this time, the first tongue piece 42a
Are opposed to each other, and the biasing force acts evenly, so that the center of the shaft portion 50 with respect to the speed nut 40 is easily determined. Further, since the lower end of the rotating body 20 is in contact with the flange 52, the rotating body 2 is
The inclination of 0 can be suppressed. Further, the projecting piece 43
Are engaged with a concave portion (not shown) of the rotating body 20 so as to rotate more reliably.

By the way, since the shaft portion 50 is made of sintered metal, the shaft portion 50 has sufficient strength and can be manufactured relatively inexpensively. It may be small, and there is a possibility that a gap may occur between the rotating body 20 and the mounting hole 23a. But,
The movement of the speed nut 40 with respect to the rotating body 20 in the direction orthogonal to the rotation axis G of the rotating body 20
Therefore, even if the shaft portion 50 is inserted in a state where the shaft portion 50 is displaced from the mounting hole 23a, the shaft portion 50 is not restricted to the first tongue piece 42a. When the shaft part 50 is fitted to the shaft part 50, the first tongue piece 42a bends evenly, so that the shaft part 50 becomes the center position of the speed nut 40 and the rotating body 20 follows the speed nut 40 by the position regulating means. The shaft portion 50 is located at the center of the mounting hole 23a of the body 20. That is, the speed nut 40
The shaft portion 50 is automatically located at the center of the mounting hole 23a by the position regulating means formed between the shaft member and the rotating body 20. In addition, since the shaft portion 50 is guided and inserted by the second tongue piece 42b, it is possible to eliminate the center deviation between the center of the rotating body 20 and the shaft portion 50. Although not shown, the shaft portion 50 has a through-hole 50a fitted with a shaft such as a worm gear connected to a steering shaft, and is rotatably fixed by the shaft. The engagement between the engagement portion 41 and the engagement portion 22 is set so that a sufficient engagement force can be obtained so that the engagement between the engagement portion 41 and the engagement portion 22 does not come off when the shaft portion 50 is pressed. ing.

Next, the operation of the rotary encoder according to the present invention will be described with reference to FIG. When the worm gear rotates due to rotation of a steering shaft (not shown), the shaft 50 rotates with this rotation. When the shaft portion 50 rotates, the rotating body 20 rotates together, and the code member 30 also rotates. Then, the change of the magnetic pole is detected by the two Hall elements 15 to output a two-phase sine wave, and the CPU or the like (not shown) formed on the printed circuit board 13
A detection pulse corresponding to the rotation of the code member 30 is detected and output from the terminal 14 as an electric signal.

Next, a rotary encoder according to a second embodiment of the present invention will be described with reference to FIG. FIG. 7 is an enlarged sectional view of a main part for describing a mounting structure of a rotating body and a speed nut according to a rotary encoder according to a second embodiment of the present invention. In the description of the rotary encoder according to the second embodiment, the same numbers and names are used for components having the same functions as those in the first embodiment.

In the rotary encoder according to the second embodiment of the present invention, in the first embodiment, the position restricting means is provided by the cylindrical locking portion 22 of the rotating body 20 and the cylindrical portion of the speed nut 40. In contrast to the configuration in which the locking by the engaging portion 41 is performed, the position restricting means includes a locking portion 22 formed of a plurality of caulked portions provided on the rotating body 20 and a plurality of locking portions provided on the base 40 a of the speed nut 40. The difference is that the speed nut 40 is formed by caulking by the engaging portion 41 including the caulking holes. By performing the crimping in this manner, the speed nut 40 is rotated by the rotation axis G.
The movement in the direction perpendicular to the direction is restricted by the locking portion 22. Furthermore, since the base 40a firmly contacts the end of the rotating body 20 by crimping, even if the first tongue 42 is bent, there is little possibility that the base 40a will float, and the rotating body 20 and the speed nut 40 will not be lifted. Is also eliminated.

Other configurations and relationships are described in the first section.
Therefore, the same reference numerals are given to the same members, and the description is omitted here.

Next, a third embodiment of the rotary encoder according to the present invention will be described with reference to FIG. FIG. 8 is an enlarged sectional view of a main part for describing a mounting structure of a rotating body and a speed nut according to a rotary encoder according to a third embodiment of the present invention. In the description of the rotary encoder according to the third embodiment, the same numbers and names are used for components having the same functions as those of the first and second embodiments.

The rotary encoder according to the third embodiment of the present invention is configured by combining the first embodiment and the second embodiment. That is, the position restricting means is configured such that the engagement portion 41 which is a cylindrical portion of the speed nut 40 is
And caulking by the engaging portion 41 which is a caulking hole. By doing so, the movement of the speed nut 40 in the direction orthogonal to the rotation axis G is
A ring-shaped engaging portion 22 and an engaging portion 41 as a cylindrical portion, and a projecting-shaped engaging portion 22 as a caulking portion and an engaging portion 41 as a caulking hole.
Is regulated by Furthermore, since the projecting piece 43 is firmly attached to the end of the rotating body 20 by caulking, there is almost no possibility that the speed nut 40 will float.

The other configurations and relationships are described in the first section.
Therefore, the same reference numerals are given to the same members, and the description is omitted here.

Although the rotary encoder according to the present invention has the above-described configuration, it is needless to say that the present invention is not limited to such a configuration. Locking part 22 and speed nut 4
The engaging portion 41 serving as the cylindrical portion of the rotary member 20 may be engaged with the outer peripheral portion of the base 21 of the rotating body 20. Further, in the first or third embodiment, the locking portion 22 does not necessarily have to be circular, but may be polygonal. In this case, the shape of the engaging portion 41 as the cylindrical portion of the speed nut 40 may be a polygonal shape corresponding to this shape. In the first to third embodiments, it has been described that the shaft portion 50 is made of a sintered metal in the embodiment, but it is needless to say that the shaft portion 50 may be formed by cutting a metal. The cord member 30 has a circular ring shape, but may have a polygonal shape such as an octagon. In the first to third embodiments, the magnetic rotary encoder has been described. However, the present invention is not limited to the magnetic type, but may be applied to an optical type.

[0037]

The speed nut of the rotary encoder according to the present invention is rotatable with the shaft and the rotating body, and moves between the rotating body and the speed nut in a direction perpendicular to the rotation axis of the rotating body. Since the position of the speed nut with respect to the rotating body is regulated because the position regulating means for regulating the shaft is provided, even if there is dimensional variation between the shaft and the cord member, the shaft is As it comes to the center of the speed nut, the rotating body moves following the speed nut that is firmly fitted to the shaft, and the center of the shaft is located at the center of the mounting hole. It is possible to provide a high-performance rotary encoder in which the members rotate so as to draw an accurate circle and produce a desired output.

Further, the speed nut in the rotary encoder according to the present invention is provided with an engagement portion, and the engagement portion is engaged with the outer periphery of the rotating body to constitute the position regulating means. With a simple configuration of engagement with the outer periphery, the position regulating means can be realized.

Further, since the engagement portion in the rotary encoder of the present invention is formed by a cylindrical portion, the engagement is ensured with a simple configuration, and a highly reliable rotary encoder can be provided. it can. In addition, the root of the tongue can be brought as close as possible to the cylindrical portion, so that the length of the tongue can be increased and a small rotary encoder can be provided.

The rotating body of the rotary encoder according to the present invention has a base and a locking portion having an outer diameter smaller than the outer diameter of the base, and the engaging portion is locked to the locking portion. As a result, the locking portion is further reduced in the radial direction, and as a result, a small rotary encoder can be provided.

Further, since the tongue piece and the engagement portion of the speed nut in the rotary encoder according to the present invention are formed by a single metal plate, they can be manufactured with a simple configuration at low cost. It is possible to provide an inexpensive rotary encoder with good mass productivity.
Since it is a single metal plate, it can have a strong structure.

The rotating body of the rotary encoder according to the present invention has a caulking portion, and a speed nut is caulked to the caulking portion to form a position regulating means. , A position regulating means can be realized. Also, the fixation of the speed nut is ensured. The rotating body and the speed nut do not separate.

Further, since the tongue pieces in the rotary encoder according to the present invention are formed so as to face each other,
Since the urging force acts evenly on the shaft, the center between the shaft and the speed nut can be more reliably positioned.

Further, the tongue in the rotary encoder according to the present invention is adjacent to the first tongue via a notch and has a smaller length than the first tongue. A second tongue piece, and a region formed by connecting the tip of the second tongue piece is substantially the same as the cross section of the shaft part. And the shaft can be easily positioned.

In the rotary encoder according to the present invention, a flange portion is formed on the shaft portion, and the flange portion abuts on a surface of the rotating body located on a side opposite to a side on which the speed nut is locked. Since it is configured to be in contact, the rotating body can be rotatably attached to the shaft portion with a simple configuration without inclining the rotating body without fail.

[Brief description of the drawings]

FIG. 1 is a bottom view of a rotary encoder according to a first embodiment of the present invention, from which a shaft portion, a lower cover, and the like are removed.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a plan view of a speed nut according to the rotary encoder of the present invention.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is an enlarged sectional view of a main part for describing a mounting structure of a rotating body and a speed nut according to the rotary encoder of the present invention.

FIG. 7 is an enlarged sectional view of a main part for describing a mounting structure of a rotating body and a speed nut according to a rotary encoder according to a second embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part for describing a mounting structure of a rotating body and a speed nut according to a rotary encoder according to a third embodiment of the present invention.

FIG. 9 is a sectional view of a main part of a conventional rotary encoder.

FIG. 10 is a plan view of a speed nut of a conventional rotary encoder.

FIG. 11 is an enlarged sectional view of a main part of a conventional rotary encoder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Case 11 Base | substrate 12 Lower cover 13 Printed circuit board 14 Terminal 15 Hall element 20 Rotating body 21 Base 22 Locking part 23 Cylindrical part 23a Mounting hole 30 Code member 40 Speed nut 40a Base 40b Notch 40c Root 41 Tube part Joint part) 42 Tongue piece 42a First tongue piece 42b Second tongue piece 43 Projection piece 50 Shaft 50a Through hole 51 Base 52 Flange

Claims (9)

[Claims] 1. A housing, a detection element mounted on the housing side, and a mounting member through which a shaft portion is inserted are provided at a central portion, and a code member facing the detection element is provided, and the code member is rotatably provided. A rotating body held by a housing, comprising a plurality of tongue pieces, the tongue pieces having a speed nut capable of being strongly fitted around the outer periphery of the shaft part, wherein the speed nut comprises the shaft part and the In addition to being rotatable with the rotating body, a position regulating means for regulating movement between the rotating body and the speed nut in a direction orthogonal to the rotation axis of the rotating body is provided. And a rotary encoder. 2. The speed nut according to claim 1, wherein an engagement portion is provided on the speed nut, and the engagement portion is locked on an outer periphery of the rotating body to constitute the position regulating means. 2. The rotary encoder according to 1. 3. The rotary encoder according to claim 2, wherein said engagement portion is formed by a cylindrical portion. 4. The rotating body has a base for holding the cord member, and an engagement member having an outer diameter smaller than the outer diameter of the base and protruding from an end surface of the base in the direction of the rotation axis of the rotating body. A locking portion, wherein the locking portion is composed of a plurality of protrusions arranged on a cylinder or on the same circumference, and the engaging portion is locked by the locking portion. Item 4. The rotary encoder according to any one of Items 2 and 3. 5. The rotary encoder according to claim 2, wherein said tongue piece and said engaging portion of said speed nut are formed of a single metal plate. 6. The rotating device according to claim 1, wherein the rotating body has a caulking portion, and the speed nut is caulked to the caulking portion, thereby forming the position regulating means. Type encoder. 7. The rotary encoder according to claim 1, wherein the plurality of tongue pieces of the speed nut are formed so as to face each other. 8. The plurality of tongues of the speed nut are adjacent to a first tongue with a notch therebetween and have a shorter length than the first tongue. 8. A second tongue, wherein a circumferential region formed by connecting the tip of the second tongue is substantially the same as the outer diameter of the shaft. Rotary encoder. 9. A flange formed on the shaft portion can contact a surface of the rotating body opposite to a side on which the speed nut is locked. The rotary encoder according to any one of claims 2 to 8.