JP2020171083A - Fixation ring - Google Patents

Abstract

To provide a low-cost and simple fixation technology for enabling easy adjustment of a load in an axial direction, a radial direction, and a circumferential direction when performing fixation, while achieving reduction in the number of components required for the fixation.SOLUTION: According to an embodiment, a fixation ring includes an annular ring body 3 having an annular first surface 3a and an annular second surface 3b facing each other, and an annular third surface 3c and an annular fourth surface 3d that are orthogonal to the first surface and the second surface, the diameter of the inscribed circle of the third surface being set to be smaller than the diameter of the circumscribed circle of the fourth surface. The ring body includes a plurality of projections 4 and a plurality of protruding portions 5. The projections are configured to be projected from the third surface in a plan view. The protruding portions are formed by bending portions of the ring body to the same side in a direction orthogonal to the first surface and the second surface, so as to be elastically deformable. The fourth surface-side length of each of the protruding portions is longer than the third surface-side length of each of the protruding portions.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to fixing rings.

Conventionally, a rotation angle sensor that detects the rotation angle of a rotating electric machine is known. The rotation angle sensor includes a resolver stator and a resolver rotor arranged so as to face the resolver stator. The resolver rotor is fixed to the rotating shaft of the rotating electric machine and rotates together with the rotating shaft.

JP-A-2007-64870

By the way, as a method of fixing the resolver rotor to the rotary shaft, for example, a method of fitting a key provided in the resolver rotor into a key groove formed in the rotary shaft, or a method of fitting the resolver rotor in a gap of the rotary shaft. In this state, a method of press-fitting a collar between the rotating shaft and the resolver rotor is assumed.

However, in the above-mentioned fixing method, since the number of parts required for fixing is large, the fixing process becomes complicated, and as a result, the cost required for fixing increases. Further, when fixing, for example, it is necessary to adjust the load in the axial direction, the radial direction, and the circumferential direction. However, the load adjustment cannot be easily performed by the above-mentioned fixing method.

An object of the present invention is to provide a low-cost and simple fixing technique capable of easily adjusting a load in the axial direction, the radial direction, and the circumferential direction at the time of fixing while reducing the number of parts required for fixing. To provide.

According to the embodiment, it has an annular first surface and a second surface facing each other, and an annular third surface and a fourth surface orthogonal to the first surface and the second surface, and is in contact with the third surface. The diameter of the tangent circle includes an annular ring body set smaller than the diameter of the circumscribed circle in contact with the fourth surface, and the ring body includes a plurality of protrusions and a plurality of protrusions. In a plan view, the convex portion is configured to protrude from the third surface, and the convex portion is configured to be elastically deformable by bending a part of the ring body in the same direction in the direction orthogonal to the first surface and the second surface. The length of the convex portion on the fourth surface side is longer than the length of the convex portion on the third surface side.

The perspective view of the fixing ring which concerns on 1st Embodiment. An enlarged view of the protrusion and the protrusion in FIG. The perspective view which shows the fixed state of the resolver rotor using the fixing ring of FIG. FIG. 3 is a plan view of the fixing ring in the fixed state of FIG. FIG. 4 is a cross-sectional view taken along the line F5-F5 of FIG. FIG. 3 is a cross-sectional view of a protrusion when the fixing ring of FIG. 1 is fitted to a rotating shaft. The perspective view of the fixing ring which concerns on 2nd Embodiment. An enlarged view of the protrusion in FIG. 7. The perspective view which shows the fixed state of the resolver rotor using the fixing ring of FIG. FIG. 6 is a cross-sectional view of a protrusion when the fixing ring of FIG. 7 is fitted to a rotating shaft. The perspective view which shows the fixing ring which concerns on 3rd Embodiment partially enlarged. The perspective view which shows the fixed state of the resolver rotor using the fixing ring of FIG.

"First embodiment"
FIG. 1 is an overall configuration diagram of the fixing ring 1 of the first embodiment. The fixing ring 1 is configured so that the fixing ring 1 itself can be fixed to the rotating shaft 7 (see FIG. 3) described later, and at the same time, the resolver rotor 6 described later can be fixed to the rotating shaft 7 (see FIG. 3). There is. As shown in FIG. 1, the fixing ring 1 includes an annular ring body 3, and the ring body 3 includes a plurality of protrusions 4 and a plurality of protrusions 5.

The ring body 3 has an annular first surface 3a and a second surface 3b, and an annular third surface 3c and a fourth surface 3d. The first surface 3a and the second surface 3b are arranged so as to face each other in parallel. The third surface 3c and the fourth surface 3d are arranged between the first surface 3a and the second surface 3b in a direction orthogonal to the first surface 3a and the second surface 3b.

Here, assuming that the diameter of the inscribed circle in contact with the third surface 3c is D1 (see FIG. 4) and the diameter of the circumscribed circle in contact with the fourth surface 3d is D2 (see FIG. 4), the diameter D1 is larger than the diameter D2. It is set small. The inscribed circle in contact with the third surface 3c refers to, for example, a virtual circle inscribed in the protruding ends (tips) of a plurality of protrusions 4 described later. Further, the circumscribed circle tangent to the fourth surface 3d refers to, for example, a virtual circle tangent to the fourth surface 3d of the circle when the fourth surface 3d forms a circle. These inscribed circles and circumscribed circles have the same center as each other. Here, if the center is defined as the center line 2, the ring main body 3 has a shape continuous in the circumferential direction around the center line 2.

Further, in the ring body 3, assuming that the distance between the first surface 3a and the second surface 3b is W1 (see FIG. 2) and the distance between the third surface 3c and the fourth surface 3d is W2 (see FIG. 2). The interval W1 is set narrower than the interval W2. The interval W1 refers to, for example, the distance (width) between the first surface 3a and the second surface 3b in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). Further, the interval W2 refers to, for example, the distance (width) between the third surface 3c and the fourth surface 3d in the direction orthogonal to the center line 2 (the radial direction of the inscribed circle and the circumscribed circle described above). ..

As a result, the ring main body 3 is formed in the shape of a hollow thin plate continuous in the circumferential direction around the center line 2. Such a ring body 3 is configured so that it can be fitted to the outside of a rotating shaft 7 described later. In order to realize such a configuration, the ring main body 3 is integrally provided with a plurality of protrusions 4 and a plurality of convex portions 5.

In FIG. 1, as an example, the same number (for example, six) of the protrusions 4 and 5 are applied to each other. The protrusions 4 and the protrusions 5 are alternately provided one by one in the circumferential direction of the ring body 3. The protrusions 4 and 5 are arranged at equal intervals in the circumferential direction of the ring body 3.

The protrusions 4 are configured to protrude from the third surface 3c in a plan view (see FIG. 4) of the first surface 3a and the second surface 3b, respectively. In the example of FIG. 1, the protrusion 4 projects from the third surface 3c of the ring body 3 in the direction orthogonal to the center line 2 (the radial direction of the inscribed circle and the circumscribed circle described above). In this case, the protrusions 4 have the same shape and the same size.

The convex portion 5 is formed by bending a part of the ring body 3 in the same direction in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2), respectively. In the example of FIG. 1, the convex portion 5 has a direction in which the first surface 3a and the second surface 3b face each other in parallel while the first surface 3a is continuously recessed (in other words, the second surface 3b is continuous). It is curved in the direction of inflating.

The convex portions 5 have the same shape and the same size as each other. Here, in the plan view of the first surface 3a and the second surface 3b (see FIG. 4), the length of the convex portion 5 on the fourth surface 3d side is L1, and the length of the convex portion 5 on the third surface 3c side. Is L2, the length L1 is longer than the length L2. Thus, the convex portion 5 is configured to be elastically deformable.

FIG. 2 is an arrangement configuration diagram of the protrusion 4 and the protrusion 5. As shown in FIG. 2, the protrusion 4 has a rectangular three-dimensional contour. A rectangular first contact end 4t is formed at the protruding end (tip) of the protruding portion 4. The first contact end 4t is configured to come into contact with the outer peripheral surface 7s of the rotating shaft 7 when the ring body 3 (fixing ring 1) is fitted to the outside of the rotating shaft 7, which will be described later.

As an example in FIG. 2, in the protrusion 4, a part of the first surface 3a and the second surface 3b is projected from the third surface 3c in a rectangular shape, and a part of the third surface 3c is projected in a rectangular shape. It is configured. The first surface 3a and the second surface 3b, which are projected from the third surface 3c in a rectangular shape, are arranged so as to face each other in parallel. Further, the third surface 3c projects so as to surround the projecting portions of the first surface 3a and the second surface 3b. The first contact end 4t described above is configured as a protruding end (tip) in which a part of the third surface 3c is projected in a rectangular shape.

Here, the contact state between the first contact end 4t of the protrusion 4 and the outer peripheral surface 7s of the rotating shaft 7 includes, for example, line contact, point contact, surface contact, and the like. In this case, the three-dimensional contour of the protrusion 4 is not limited to a rectangular shape, and may have a shape other than this. For example, a quadrangular truncated cone shape or a truncated cone shape that tapers toward the first contact end 4t may be applied as the three-dimensional contour of the protrusion 4. The shape (contour) and size of the protrusion 4 are not particularly limited here because they are set according to, for example, the intended use and purpose of use of the fixing ring 1.

The convex portion 5 has a three-dimensional contour in which a part of the ring body 3 is curved in the same direction when viewed in a direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). .. In the example of FIG. 2, the convex portion 5 has a continuous curvature from the third surface 3c side to the fourth surface 3d side in the direction orthogonal to the center line 2 (the radial direction of the inscribed circle and the circumscribed circle described above). Is getting smaller. Thus, in the plan view of the first surface 3a and the second surface 3b (see FIG. 4), the length L1 of the convex portion 5 on the fourth surface 3d side is larger than the length L2 of the convex portion 5 on the third surface 3c side. Is also getting longer.

The convex portion 5 in which a part of the ring body 3 is curved has the most protruding portion when viewed in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2), and this portion has a convex portion 5. A curved second contact end 5t is provided. In the example of FIG. 2, the second contact end 5t is formed on the second surface 3b that forms the contour of the convex portion 5. The second contact end 5t is configured to come into contact with the surface 6d of the resolver rotor 6 (see FIG. 3) described later when the ring body 3 (fixing ring 1) is fitted to the outside of the rotating shaft 7 described later. There is. In this case, the contact state between the second contact end 5t of the convex portion 5 and the surface 6d of the resolver rotor 6 is, for example, line contact, point contact, depending on the degree of curvature of the convex portion 5 described above. Surface contact is expected.

FIG. 3 is a diagram showing a state in which the resolver rotor 6 is fixed to the rotating shaft 7 of the rotary electric machine by the fixing ring 1 described above. The type of rotary electric machine includes both an inner rotor type and an outer rotor type. In the inner rotor type rotary electric machine, the rotor is rotatably arranged inside the stator. On the other hand, in the outer rotor type rotary electric machine, the rotor is rotatably arranged on the outside of the stator.

In any of the above methods, the rotary shaft 7 shown in FIG. 3 is configured to rotate integrally with the rotor. Further, the resolver rotor 6 fixed to the rotating shaft 7 by the fixing ring 1 also rotates integrally with the rotor. As a result, the resolver rotor 6 is configured as a rotation angle sensor that detects the rotation angle of the rotation shaft 7 in cooperation with the resolver stator provided on the stator.

The resolver rotor 6 is formed by laminating a plurality of annular steel plates 6p (see FIG. 5). The steel plate 6p has a hollow thin plate shape having the same shape and dimensions. Thus, an annular resolver rotor 6 having a perfectly circular through hole 6h formed inside is realized. The transfer diameter (inner diameter) of the through hole 6h is set so that the resolver rotor 6 can be gap-fitted to the outside of the rotary shaft 7.

Further, the resolver rotor 6 has a non-perfect circular outer peripheral surface 6s continuous in the circumferential direction. A plurality of expansion portions 6a and contraction portions 6b are provided on the outer peripheral surface 6s of the resolver rotor 6. The expanding portion 6a and the contracting portion 6b are arranged alternately one by one in the circumferential direction at equal intervals. In the example of FIG. 3, the expansion portion 6a is configured by inflating a part of the outer peripheral surface 6s into an arc shape. The contraction portion 6b is arranged between two adjacent expansion portions 6a, and is configured by recessing a part of the outer peripheral surface 6s.

Therefore, during the rotation of the rotating shaft 7 (rotor), the gap between the resolver rotor 6 and the resolver stator changes at a constant timing. At this time, the rotation angle of the rotary electric machine (rotary shaft 7) is detected based on the change in the gap. For example, during rotation, an electric current is passed through a coil wound around a resolver stator to form a magnetic field. The resolver rotor 6 rotates in a magnetic field. At this time, the amount of magnetic flux changes from place to place. The change state of this magnetic flux is detected. As a result, the rotation angle of the rotating electric machine (rotating shaft 7) is detected.

FIG. 4 is an arrangement configuration diagram of the fixing ring 1 and the resolver rotor 6 in a plan view of the first surface 3a. As an example in FIG. 4, the fixed ring 1 (ring body 3) has a circular fourth surface 3d. The shape of the fourth surface 3d of the fixing ring 1 (ring body 3) is not limited to a circular shape, and may be a shape other than this (for example, an elliptical shape or a polygonal shape).

As shown in FIG. 4, in the fixed state by the fixing ring 1, the fixing ring 1 (ring body 3) is designed so that the outer peripheral surface 3b thereof is positioned inside the outer peripheral surface 6s of the resolver rotor 6. .. This makes it possible to fix the resolver rotor 6 to the rotation shaft 7 without affecting the magnetic efficiency of the rotation angle sensor at the time of detecting the rotation angle.

Further, the fixing ring 1 (ring body 3) is designed so that it can be tightened and fitted to the outside of the rotating shaft 7. In this case, in the fixed state by the fixing ring 1, only the protrusion 4 (first contact end 4t) of the fixing ring 1 (ring body 3) comes into contact with the outer peripheral surface 7s of the rotating shaft 7. In other words, the third surface 3c of the fixing ring 1 (ring body 3) other than the protrusion 4 (first contact end 4t) does not come into contact with the outer peripheral surface 7s of the rotating shaft 7.

Further, in the plan view of the first surface 3a and the second surface 3b, the protrusion 4 protrudes from the third surface 3c. The diameter D1 of the inscribed circle in contact with the third surface 3c is set smaller than the diameter D2 of the circumscribed circle in contact with the fourth surface 3d. The length L1 on the fourth surface 3d side of the convex portion 5 is longer than the length L2 on the third surface 3c side of the convex portion 5.

FIG. 5 is a schematic view of a process of fixing the resolver rotor 6 to the rotating shaft 7 by the fixing ring 1. As shown in FIG. 5, the through hole 6h of the resolver rotor 6 is gap-fitted to the outside of the rotating shaft 7. At this time, the back surface 6c of the resolver rotor 6 is placed on the shelf portion 7p of the rotating shaft 7. The back surface 6c of the resolver rotor 6 has an annular shape continuous in the circumferential direction and has a flat surface shape without unevenness. On the other hand, the shelf portion 7p of the rotating shaft 7 has an annular shape continuous in the circumferential direction and has a flat surface shape without unevenness. Therefore, the back surface 6c of the resolver rotor 6 and the shelf portion 7p of the rotating shaft 7 come into contact with each other without a gap.

Next, the fixing ring 1 (ring body 3) is tightened and fitted to the outside of the rotating shaft 7. In this case, a pressing force is applied to the first surface 3a of the fixed ring 1 (ring body 3) from the upper side of the center line 2 to the lower side of the center line 2. As a method of applying the pressing force, for example, a method of applying the pressing force to the first surface 3a by a hollow cylindrical pressing jig is assumed. As a result, the fixing ring 1 (ring body 3) is pushed toward the resolver rotor 6.

Then, the pushing operation is stopped at a preset position. During this time, the convex portion 5 is elastically deformed so that the third surface 3c side of the fixed ring 1 (ring body 3) expands in the direction orthogonal to the center line 2 (the radial direction of the inscribed circle and the circumscribed circle described above). To do. For example, the pressing jig described above applies a pressing force to the outer peripheral side of the ring body 3 (first surface 3a). At this time, the fixing ring 1 (ring body 3) is slightly inclined with both ends in the circumferential direction of the convex portion 5 on the third surface 3c side as fulcrums.

As a result, in the plan view of the first surface 3a and the second surface 3b, the protrusion 4 retracts outward in the radial direction together with the fixing ring 1 (ring body 3). As a result, the fixing ring 1 (ring body 3) can be smoothly moved along the rotating shaft 7. Thus, the curved second contact end 5t, which is the protruding end (tip) of the convex portion 5, comes into contact with the surface 6d of the resolver rotor 6 at an optimum pressure.

After that, the pressing force by the pressing jig is released. Then, the convex portion 5 elastically deforms to restore the initial shape. At this time, the diameter of the third surface 3c side of the fixed ring 1 (ring body 3) is reduced inward in the direction orthogonal to the center line 2 (that is, in the radial direction). In other words, the protrusion 4 advances inward in the radial direction. As a result, the first contact end 4t, which is the protruding end (tip) of the protruding portion 4, comes into contact with the outer peripheral surface 7s of the rotating shaft 7. As a result, the fixing ring 1 (ring body 3) is fixed (tightened) to the outer circumference of the rotating shaft 7.

Then, at the same time that the fixing ring 1 (ring body 3) is fixed to the rotating shaft 7, an optimum pressure acts on the surface 6d of the resolver rotor 6 from the convex portion 5 (second contact end 5t). As a result, the resolver rotor 6 is maintained in a state of being sandwiched between the convex portion 5 (second contact end 5t) of the fixing ring 1 (ring body 3) and the shelf portion 7p of the rotating shaft 7. As a result, the resolver rotor 6 is fixed to the rotating shaft 7 without generating, for example, stress-strain.

FIG. 6 is a cross-sectional configuration diagram of the protrusion 4 (first contact end 4t) in the fixed state. As described above, the fixing ring 1 (ring body 3) is tightly fitted to the outside of the rotating shaft 7. Therefore, the diameter D1 (see FIG. 4) of a virtual circle (that is, an inscribed circle in contact with the third surface 3c described above) connecting the protruding ends (first contact ends 4t) of each protrusion 4 to each other in the circumferential direction. Is set smaller than the diameter of the outer peripheral surface 7s of the rotating shaft 7 (for example, the fixed portion 7c). The fixing portion 7c refers to a portion of the outer peripheral surface 7s of the rotating shaft 7 in which the resolver rotor 6 is fixed to the rotating shaft 7 by the fixing ring 1.

As shown in FIG. 6, when the fixing ring 1 (ring body 3) is pushed by the above-mentioned pressing force applying method, the rotating shaft 7 (fixing portion) is attached to the protruding end (first contact end 4t) of the protrusion 4. The reaction force from the outer peripheral surface 7s of 7c) acts. Then, when the pushing operation is stopped (see FIG. 5), that is, the resolver rotor 6 has a convex portion 5 (second contact end 5t) of the fixing ring 1 (ring body 3) and a shelf of the rotating shaft 7. When sandwiched between the portions 7p, the protrusion 4 and the ring body 3 around the protrusion 4 are elastically deformed toward the upper side of the center line 2.

At this time, as an example in FIG. 6, the lower end side T2 of the protruding end (first contact end 4t) of the protruding portion 4 when viewed in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). Only contacts (for example, line contact) the outer peripheral surface 7s of the rotating shaft 7 (fixed portion 7c). The end surface Tm and the upper end side T1 are in non-contact with the outer peripheral surface 7s of the rotating shaft 7 (fixed portion 7c). The protruding end (first contact end 4t) of the protruding portion 4 has a flat end surface Tm, and upper end sides T1 and lower end sides T2 on both sides of the end surface Tm. The upper end side T1 is located above the lower end side T2.

Here, for example, the contour of the protruding end (first contact end 4t) of the protrusion 4 may be changed according to the use and purpose of use of the fixing ring 1. As a result, for example, the end surface Tm of the protruding end (first contact end 4t) of the protrusion 4 may be brought into contact with the outer peripheral surface 7s of the rotating shaft 7 (fixed portion 7c), or the protruding end (first contact end 4t) of the protrusion 4 may be brought into contact with the outer peripheral surface 7s. The upper end side T1 of 1 contact end 4t) can be brought into contact with the outer peripheral surface 7s of the rotating shaft 7 (fixed portion 7c).

As described above, according to the first embodiment, in the plan view (see FIG. 4) of the first surface 3a and the second surface 3b, the plurality of protrusions 4 are configured to protrude from the third surface 3c. As a result, in the fixed state, only the protrusion 4 (first contact end 4t) can be evenly contacted with the outer peripheral surface 7s of the rotating shaft 7. As a result, the fixed ring 1 (ring body 3) itself is not displaced in the axial direction (center line 2 direction), the radial direction (direction orthogonal to the center line 2), and the circumferential direction (direction around the center line 2). , Can be fixed to the rotating shaft 7. In this case, for example, as shown in FIG. 6, only the lower end side T2 of the protruding end (first contact end 4t) of the protruding portion 4 is brought into contact with the outer peripheral surface 7s of the rotating shaft 7. As a result, the fixing strength of the fixing ring 1 (ring body 3) with respect to the rotating shaft 7 can be improved.

According to the first embodiment, a plurality of convex portions 5 are formed by bending a part of the ring main body 3 in a direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). In this case, in the direction orthogonal to the center line 2 (radial direction), the curvature of the convex portion 5 becomes continuously smaller from the third surface 3c side to the fourth surface 3d side. In the plan view of the first surface 3a and the second surface 3b (see FIG. 4), the length L1 of the convex portion 5 on the fourth surface 3d side is longer than the length L2 of the convex portion 5 on the third surface 3c side. It has become. According to such a configuration, the convex portion 5 is elastically deformed at the time of fixing, so that the protruding portion 4 retracts outward in the radial direction together with the fixing ring 1 (ring body 3). As a result, the fixing ring 1 (ring body 3) can be smoothly moved along the rotating shaft 7. As a result, the curved second contact end 5t, which is the protruding end (tip) of the convex portion 5, can be brought into contact with the surface 6d of the resolver rotor 6 at an optimum pressure. Then, in this state, by fixing the fixing ring 1 (ring body 3) to the rotating shaft 7, the resolver rotor 6 is connected to the convex portion 5 (second contact end 5t) of the fixing ring 1 (ring body 3). It can be fixed to the rotary shaft 7 in a state of being sandwiched between the shelf portion 7p of the rotary shaft 7 without generating, for example, stress strain.

According to the first embodiment, the protrusions 4 and the protrusions 5 are alternately arranged in the circumferential direction of the ring body 3. As a result, the fixing ring 1 (ring body 3) itself can be fixed to the rotating shaft 7, and at the same time, the resolver rotor 6 can be fixed to the rotating shaft 7. In this case, the number of parts required for fixing is significantly reduced, so that the fixing process can be simplified. As a result, the cost required for fixing can be reduced. At the same time, when fixing, the load can be easily adjusted in the axial direction (center line 2 direction), the radial direction (direction orthogonal to the center line 2), and the circumferential direction (direction around the center line 2).

"Second embodiment"
FIG. 7 is an overall configuration diagram of the fixing ring 1 of the second embodiment. The fixing ring 1 is configured so that the resolver rotor 6 can be fixed to the rotating shaft 7 (see FIG. 9). As shown in FIG. 7, the fixing ring 1 includes an annular ring body 3, and the ring body 3 includes a plurality of protrusions 4 and a plurality of protrusions 5.

The rotary shaft 7 and the resolver rotor 6 of FIG. 9 and the rotary shaft 7 and the resolver rotor 6 of FIG. 3 have the same shape (configuration) and the same size. Further, the ring main body 3 and the convex portion 5 of the present embodiment have the same shape (configuration) and the same size as the ring main body 3 and the convex portion 5 of the first embodiment described above. Therefore, the description of the ring body 3 and the convex portion 5 will be omitted below, and the description will be limited to the protruding portion 4.

In FIG. 7, as an example, the same number (for example, 6) of the protrusions 4 and 5 are applied to each other. The protrusions 4 and the protrusions 5 are alternately provided one by one in the circumferential direction of the ring body 3. The protrusions 4 and 5 are arranged at equal intervals in the circumferential direction of the ring body 3. The protrusions 4 are configured to protrude from the third surface 3c in a plan view (see FIG. 4) of the first surface 3a and the second surface 3b, respectively.

In the example of FIG. 7, the protrusions 4 are provided one by one in the plurality of recesses 3p. The recesses 3 are arranged at equal intervals in the circumferential direction of the ring body 3. The concave portion 3 and the convex portion 5 are alternately provided one by one in the circumferential direction of the ring main body 3. The recess 3 is formed by partially recessing the third surface 3c of the ring body 3 in the direction of the fourth surface 3d in a rectangular shape.

The protrusion 4 is formed from the most recessed portion of the recesses 3 (that is, the portion closest to the fourth surface 3d) in the plan view (see FIG. 4) of the first surface 3a and the second surface 3b. It extends beyond the third surface 3c. In this case, the protrusion 4 is inclined and extends in a direction intersecting the first surface 3a and the second surface 3b. The protrusion 4 is arranged in non-contact with the third surface 3c forming the recess 3. The protrusions 4 have the same shape and the same size as each other. The degree of inclination of the protrusion 4 can be defined as the angle formed by the virtual plane orthogonal to the center line 2.

FIG. 8 is an arrangement configuration diagram of the protrusion 4. As an example in FIG. 8, the protrusion 4 has a rectangular three-dimensional shape including a protruding end (tip) and a base end, and an elastic region 4p formed between the protruding end (tip) and the base end. are doing. The base end of the protrusion 4 is fixed to the ring body 3 at the most recessed portion of the recess 3.

The protruding end (tip) of the protruding portion 4 is positioned so as to protrude from the first surface 3a in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). A rectangular first contact end 4t is formed at the protruding end (tip) of the protruding portion 4. The first contact end 4t is configured to come into contact with the outer peripheral surface 7s of the rotating shaft 7 when the ring body 3 (fixing ring 1) is tightened and fitted to the outside of the rotating shaft 7.

In order to realize such a configuration, the diameter of a virtual circle (that is, an inscribed circle in contact with the third surface 3c described above) in which the protruding ends (first contact ends 4t) of each protrusion 4 are connected to each other in the circumferential direction. D1 (see FIG. 4) is set to be smaller than the diameter of the outer peripheral surface 7s of the rotating shaft 7 (for example, the fixing portion 7c). The fixing portion 7c refers to a portion of the outer peripheral surface 7s of the rotating shaft 7 in which the resolver rotor 6 is fixed to the rotating shaft 7 by the fixing ring 1.

FIG. 9 is a schematic view of a process of fixing the resolver rotor 6 to the rotating shaft 7 by the fixing ring 1. FIG. 10 is a schematic view showing the protrusion 4 (first contact end 4t) in the fixed state. As shown in FIGS. 9 and 10, the resolver rotor 6 (through hole 6h) is gap-fitted to the outside of the rotating shaft 7. Next, the fixing ring 1 (ring body 3) is tightened and fitted to the outside of the rotating shaft 7 by a pressing jig.

At this time, the first contact end 4t, which is the protruding end (tip) of the protruding portion 4, comes into contact with the outer peripheral surface 7s of the rotating shaft 7. Thus, in the resolver rotor 6, for example, the convex portion 5 (second contact end 5t) of the fixing ring 1 (ring body 3) and the shelf portion 7p of the rotating shaft 7 (see FIG. 5) do not generate stress strain or the like. It is maintained in a state of being sandwiched between and.

By the way, when the fixing ring 1 (ring body 3) is tightened and fitted to the outside of the rotating shaft 7, the outer peripheral surface 7s of the rotating shaft 7 (fixing portion 7c) is attached to the protruding end (first contact end 4t) of the protruding portion 4. The reaction force from is acting. Then, when the resolver rotor 6 is sandwiched between the convex portion 5 (second contact end 5t) of the fixing ring 1 (ring body 3) and the shelf portion 7p of the rotating shaft 7 (see FIG. 9), the protruding portion 4 (see FIG. 9). The elastic region 4p) is maintained in a state of being elastically deformed toward the upper side of the center line 2.

At this time, as an example in FIG. 10, the lower end side T2 of the protruding end (first contact end 4t) of the protrusion 4 when viewed in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). Only contacts (for example, line contact) the outer peripheral surface 7s of the rotating shaft 7 (fixed portion 7c). The end face Tm and the upper end side T1 are in non-contact with the outer peripheral surface 7s of the rotating shaft 7 (fixed portion 7c). The protruding end (first contact end 4t) of the protruding portion 4 has a flat end surface Tm, and upper end sides T1 and lower end sides T2 on both sides of the end surface Tm. The upper end side T1 is located above the lower end side T2.

Here, for example, the contour of the protruding end (first contact end 4t) of the protrusion 4 may be changed according to the use and purpose of use of the fixing ring 1. As a result, for example, the end surface Tm of the protruding end (first contact end 4t) of the protrusion 4 may be brought into contact with the outer peripheral surface 7s of the rotating shaft 7 (fixed portion 7c), or the protruding end (first contact end 4t) of the protrusion 4 may be brought into contact with the outer peripheral surface 7s. The upper end side T1 of 1 contact end 4t) can be brought into contact with the outer peripheral surface 7s of the rotating shaft 7 (fixed portion 7c).

As described above, according to the second embodiment, the elastic region 4p is interposed between the protruding end (tip) and the base end of the protruding portion 4. As a result, the elastic region 4p is elastically deformed at the time of fixing, so that the fixing ring 1 (ring body 3) can be easily fitted to the outer peripheral surface 7s of the rotating shaft 7. As a result, the load can be easily adjusted in the axial direction (direction of the center line 2), the radial direction (direction orthogonal to the center line 2), and the circumferential direction (direction around the center line 2). Since other configurations and effects are the same as those in the first embodiment described above, the description thereof will be omitted.

"Third embodiment"
FIG. 11 is a partially enlarged view of the fixing ring 1 according to the third embodiment. The present embodiment is an improvement of the first and second embodiments described above, and FIG. 11 shows, as an example, a configuration of a fixing ring 1 in which a feature portion of the present embodiment is incorporated in the second embodiment described above. ing.

As shown in FIG. 11, the fixing ring 1 of the present embodiment is configured so that the resolver rotor 6 described later can be fixed to the rotating shaft 7 (see FIG. 12). The fixing ring 1 includes an annular ring body 3, and the ring body 3 includes a plurality of protrusions 4, a plurality of convex portions 5, and a plurality of elastic portions 8.

The rotary shaft 7 and the resolver rotor 6 of FIG. 12 and the rotary shaft 7 and the resolver rotor 6 of FIG. 9 have the same shape (configuration) and the same size. Further, the ring main body 3, the protrusion 4 and the convex portion 5 of the present embodiment have the ring main body 3 of the second embodiment described above, except that the convex portion 5 is configured to be narrow in order to arrange the elastic portion 8 described later. , Has the same shape (configuration) as the protrusion 4 and the protrusion 5, and has the same size. Therefore, the description of the ring body 3, the protrusion 4 and the protrusion 5 will be omitted below, and the description will be limited to the elastic portion 8.

In the fixing ring 1 of the present embodiment, the ring main body 3 is configured to include a plurality of elastic portions 8 on the third surface 3c or the fourth surface 3d of the ring main body 3. In the example of FIG. 11, the elastic portion 8 is provided on the fourth surface 3d of the ring body 3. The same number (for example, six) of the elastic portions 8 are applied to the protrusions 4 and 5, and the elastic portions 8 are arranged at equal intervals in the circumferential direction of the ring body 3. In this case, the elastic portion 8 is positioned so as to face the outside of the convex portion 5.

Each of the plurality of elastic portions 8 has an elastic main body 8c formed between the base end 8a and the tip end 8b and between the base end 8a and the tip end 8b. The elastic body 8c has the same width as the distance W1 (see FIG. 2) between the first surface 3a and the second surface 3b in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). It has a thickness).

The base end 8a of the elastic portion 8 is fixed to the fourth surface 3d of the ring body 3. The tip 8b of the elastic portion 8 is positioned so as to protrude from the convex portion 5 in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). The tip 8b of the elastic portion 8 is positioned at a distance from the base end 8a in the circumferential direction of the ring body 3.

According to such a configuration, the elastic portion 8 has a base end 8a supported by the ring body 3 and a tip end 8b having a free end. The elastic body 8c is inclined downward from the base end 8a toward the tip end 8b in the direction intersecting the first surface 3a and the second surface 3b. The degree of inclination of the elastic portion 8 can be defined as the angle formed by the virtual plane orthogonal to the center line 2.

FIG. 12 is a schematic view of a process of fixing the resolver rotor 6 to the rotating shaft 7 by the fixing ring 1 described above. As shown in FIG. 12, the resolver rotor 6 (through hole 6h) is gap-fitted to the outside of the rotating shaft 7. After that, the fixing ring 1 (ring body 3) is tightened and fitted to the outside of the rotating shaft 7.

At this time, the tip 8b of the elastic portion 8 is elastically deformed while being in contact with the surface 6d of the resolver rotor 6 prior to the convex portion 5 (second contact end 5t). After that, the convex portion 5 (second contact end 5t) comes into contact with the surface 6d of the resolver rotor 6 at an optimum pressure. As a result, the resolver rotor 6 is formed by the convex portion 5 (second contact end 5t) of the fixing ring 1 (ring body 3), the tip 8b of the elastic portion 8, and the shelf portion 7p (see FIG. 5) of the rotating shaft 7. It is maintained in a pinched state.

As described above, according to the third embodiment, a plurality of elastic portions 8 are provided on the third surface 3c or the fourth surface 3d of the ring body 3. The elastic portion 8 is positioned so that the base end 8a is supported by the ring body 3 and the tip end 8b protrudes from the convex portion 5 in the direction orthogonal to the first surface 3a and the second surface 3b (direction of the center line 2). Be done. In this case, upon fixing, the tip 8b of the elastic portion 8 is elastically deformed while being in contact with the surface 6d of the resolver rotor 6 prior to the convex portion 5 (second contact end 5t). As a result, when fixing, the load can be easily adjusted in the axial direction (center line 2 direction), the radial direction (direction orthogonal to the center line 2), and the circumferential direction (direction around the center line 2). Since other configurations and effects are the same as those in the first embodiment described above, the description thereof will be omitted.

"Modification example"
In the above-described embodiment (FIGS. 3, 4, 9, and 12), a pressing load is applied from the six convex portions 5 to the resolver rotor 6 having four poles (four expanding portions 6a). , Preferably, the pressing load is applied to the same portion of the resolver rotor 6 (for example, the same portion of the expanding portions 6a) by the plurality of convex portions 5. For example, the number of convex portions 5 is set to an integral multiple of the number of poles (expanding portion 6a) of the resolver rotor 6. As a result, the pressing load from the convex portion 5 can be applied evenly to, for example, the same portion of each of the expanding portions 6a (poles). As a result, it is possible to eliminate variations in the magnetic effect of each pole (expansion portion 6a).

In the above-described embodiment, the rotating shaft 7 and the fixing ring 1 are preferably made of materials having substantially the same coefficient of linear expansion. As a result, even if the ambient temperature changes, the fixed state of the fixing ring 1 with respect to the resolver rotor 6 can be maintained constant.

In the above-described embodiment, a rectangular first contact end 4t (end face Tm, upper end side T1, lower end side T2) is formed at the protruding end (tip) of the protrusion 4, but in this case, the first contact is made when fixing. It is preferable to reduce the contact area between the end 4t and the rotating shaft 7 (outer peripheral surface 7s). For example, it is configured to be line contact rather than surface contact and point contact rather than line contact. As a result, at the time of fixing, the protruding end (first contact end 4t) of the protrusion 4 can be made to bite into the rotating shaft 7 (outer peripheral surface 7s). As a result, the fixing ring 1 can be firmly fixed to the rotating shaft 7.

In the above-described embodiment, the contour of the protruding end (first contact end 4t) of the protruding portion 4 may be curved so as to come into contact with the rotating shaft 7 (outer peripheral surface 7s) without a gap. For example, the contour of the protruding end (first contact end 4t) of the protruding portion 4 is formed into an arc shape that matches the curvature of the rotating shaft 7 (outer peripheral surface 7s).

Although one embodiment and some modifications of the present invention have been described above, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These embodiments and modifications can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... fixed ring, 2 ... center line, 3 ... ring body, 3a ... 1st surface, 3b ... 2nd surface, 3c ... 3rd surface, 3d ... 4th surface, 3p ... recess, 4 ... protrusion, 4t ... 1st contact end, 4p ... Elastic region, 5 ... Convex part, 5t ... 2nd contact end, 6 ... Resolver rotor, 7 ... Rotating shaft, 8 ... Elastic part, 8a ... Base end, 8b ... Tip, 8c ... Elastic Main body, D1 ... Diameter of the inscribed circle in contact with the third surface, D2 ... Diameter of the circumscribed circle in contact with the fourth surface, W1 ... Spacing between the first and second surfaces, W2 ... Third and fourth surfaces , L1 ... The length of the convex portion on the fourth surface side, L2 ... The length of the convex portion on the third surface side.

Claims (3)

An annular third surface and a second surface arranged in a direction orthogonal to the first surface and the second surface between the first surface and the second surface of the annular surface facing each other and the first surface and the second surface. The diameter of the inscribed circle having four surfaces and in contact with the third surface is set smaller than the diameter of the circumscribed circle in contact with the fourth surface, and the first surface and the second surface are A ring body having an annular ring body set to be narrower than the distance between the third surface and the fourth surface is provided.
The ring body includes a plurality of protrusions and a plurality of protrusions.
The plurality of protrusions and the plurality of protrusions are alternately provided in the circumferential direction of the ring body.
The plurality of protrusions are configured to protrude from the third surface in the plan view of the first surface and the second surface, respectively.
The plurality of convex portions are configured to be elastically deformable by bending a part of the ring body in the same direction in the directions orthogonal to the first surface and the second surface, respectively.
A fixing ring in which the length of the convex portion on the fourth surface side is longer than the length of the convex portion on the third surface side. The fixing ring according to claim 1, wherein the convex portions have the same shape as each other. The ring body is provided with a plurality of elastic portions on the third surface or the fourth surface of the ring body.
Each of the plurality of elastic portions has an elastic body formed between a base end and a tip and between the base end and the tip.
The base end of the elastic portion is fixed to the third surface or the fourth surface of the ring body.
The tip of the elastic portion is positioned so as to protrude from the convex portion in a direction orthogonal to the first surface and the second surface, and is positioned away from the base end in the circumferential direction of the ring body. The fixing ring according to claim 1.

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