CN210724363U - Connection structure between rotary transformer rotor and rotating shaft - Google Patents
Connection structure between rotary transformer rotor and rotating shaft Download PDFInfo
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- CN210724363U CN210724363U CN201921720870.0U CN201921720870U CN210724363U CN 210724363 U CN210724363 U CN 210724363U CN 201921720870 U CN201921720870 U CN 201921720870U CN 210724363 U CN210724363 U CN 210724363U
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- key groove
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- resolver rotor
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- 230000008878 coupling Effects 0.000 claims 2
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- 238000005859 coupling reaction Methods 0.000 claims 2
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- 230000002093 peripheral effect Effects 0.000 abstract description 7
- 238000013459 approach Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model provides a connection structure between rotary transformer rotor and pivot. The inner peripheral surface of the rotary transformer rotor is provided with a convex key protruding towards the radial inner side of the rotary transformer rotor, the outer peripheral surface of the rotating shaft is provided with a key groove recessed towards the radial inner side of the rotating shaft, the convex key is embedded with the key groove to enable the rotary transformer rotor to be fixedly connected with the rotating shaft, the convex key is provided with a cutting groove recessed towards the radial outer side of the rotary transformer rotor from the protruding end of the convex key, the key groove is provided with an opening on the end face of one end of the rotating shaft, the end edge of the opening is provided with a chamfer, the chamfer is arranged on the end portions of two opposite inner wall surfaces of the key groove, and the width dimension of the convex key is larger than that of the key groove but. With the above configuration, the key can be easily fitted into the key groove, and even if there is a variation in the dimensions of the key and the key groove, the key and the key groove can be easily fitted to each other.
Description
Technical Field
The utility model relates to a connection structure between rotary transformer rotor and pivot.
Background
Conventionally, as a connection structure between a rotor and a rotating shaft, there is a structure in which a convex key formed on an inner peripheral surface of the rotor is fitted into a key groove formed on an outer peripheral surface of the rotating shaft, thereby connecting the rotor and the rotating shaft.
In the above configuration, the key may be formed with a slit dividing the key into two parts, the width of the key groove may be larger than the width of the protruding end of the key, and after the key is inserted into the key groove, the pin piece may be inserted into the slit inner end of the key so as to expand the width of the key and abut against the inner wall surface of the key groove. With this structure, the key can be easily inserted into the key groove, but the pin piece is required, and the operation of inserting the pin piece is required, so that the structure is complicated, and the assembly operation is time-consuming and labor-consuming.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a connection structure between a resolver rotor and a rotating shaft that is simple in structure and easy in assembly work.
As a technical solution to solve the above technical problem, the present invention provides a connection structure between a resolver rotor and a rotating shaft, wherein a projection key is formed on an inner peripheral surface of the resolver rotor, the projection key projecting radially inward and extending a predetermined length in an axial direction thereof, extending a predetermined width in a circumferential direction thereof, and forming a key groove on an outer peripheral surface of the rotating shaft, the key groove extending the predetermined length in the axial direction thereof, extending the predetermined width in the circumferential direction thereof, and recessing radially inward and the projection key is engaged with the key groove to fixedly connect the resolver rotor to the rotating shaft, the connection structure comprising: the key groove has an opening on an end face of one end of the rotating shaft, and a chamfer is formed on an end edge of the opening and is arranged at the end parts of two opposite inner wall surfaces of the key groove, and the width dimension of the key is larger than that of the key groove but smaller than that of the opening of the key groove on the end face of the rotating shaft.
The utility model discloses an above-mentioned connection structure between resolver rotor and pivot's advantage lies in, and simple structure and equipment operation are easy. Specifically, when assembling the resolver rotor and the rotating shaft, the end of the rotating shaft, which is formed with the key groove, is made to be close to one end surface of the resolver rotor, the opening of the key groove in the rotating shaft is made to be aligned with the position of the convex key on the resolver rotor, and then the convex key can be embedded into the key groove by pressing the resolver rotor after two corners of one end of the convex key are abutted against the chamfer of the key groove. In this process, since the width of the opening of the key groove on the end surface of the rotating shaft is larger than the width of the key, the key is easily inserted into the key groove, and thereafter, when the key is pushed toward the inside of the key groove having a narrowed width along the inclined surface at the chamfer, the key is elastically deformed after being pushed in the width direction to narrow the notch formed in the key, so that the width of the key is narrowed and the key is pressed into the key groove, and in the key groove, both side walls of the key are brought into contact with both inner wall surfaces of the key groove by the elastic restoring force, whereby the resolver rotor and the rotating shaft are tightly coupled together.
Therefore, with the above configuration of the present invention, the key of the resolver rotor can be easily pressed into the key groove of the rotating shaft, and even when there is a deviation in the dimensions of the key and the key groove, the key can be easily and closely fitted into the key groove.
In addition, in the above-mentioned connection structure between resolver rotor and the rotating shaft of the present invention, preferably, the key groove is formed as an open opposite side, and the two inner wall surfaces facing each other are connected to the front end surface of the key groove to form a smooth curved surface. In general, in the key groove, stress is easily concentrated on corners where the two inner wall surfaces are connected to the front end surface. Based on the above structure of the utility model, because the keyway is constituted, two internal faces link to each other with preceding terminal surface and constitute level and smooth curved surface, the internal face links to each other the place for there is not the smooth curved surface of bight with preceding terminal surface promptly, so can disperse above-mentioned stress.
Drawings
Fig. 1 is a cross-sectional view showing a connection structure between a resolver rotor and a rotating shaft according to an embodiment of the present invention.
Fig. 2 is a schematic view showing a key on the resolver rotor and a key groove on the rotating shaft before assembly, as seen from the X direction in fig. 1.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a sectional view showing a connection structure between a resolver rotor 1 and a rotating shaft 2 according to the present embodiment. The resolver shown in fig. 1 is used for detecting a rotation angle of a motor, and includes a resolver rotor 1 made of electromagnetic steel, an excitation coil not shown, and a detection coil not shown.
The resolver rotor 1 and the rotating shaft 2 are fixedly connected by fitting to each other, and a single rotating body is assembled. The resolver rotor 1 is cylindrical, and a convex key 3 is formed at a predetermined portion of the inner peripheral surface thereof. The rotating shaft 2 is cylindrical, and a key groove 4 is formed at a predetermined portion of the circumferential surface thereof.
Fig. 2 is a schematic view showing the key 3 on the resolver rotor 1 and the key groove 4 on the rotating shaft 2 before assembly, as seen from the X direction in fig. 1. As shown in fig. 1 and 2, the key 3 is configured to protrude a predetermined height from the inner circumferential surface of the resolver rotor 1 toward the inside in the radial direction; extending a predetermined length from an end surface of one side of the resolver rotor 1 toward the other side in the axial direction of the resolver rotor 1; extending by a predetermined width in the circumferential direction of the resolver rotor 1. That is, the key 3 is formed in a rectangular parallelepiped shape extending in the axial direction of the resolver rotor 1.
The key 3 is formed with a notch 5 penetrating along a center line 100 thereof (parallel to the axis of the resolver rotor 1 and located at the center in the width direction of the key 3). As shown in fig. 1, the notch 5 is recessed by a predetermined depth from the protruding end of the key 3 to the outside in the radial direction. The inner wall surface of the slot 5 is substantially parallel to the center line 100 of the key 3 (or the axis of the resolver rotor 1).
On the other hand, the key groove 4 is configured to be recessed by a predetermined depth from the outer circumferential surface of the rotating shaft 2 to the radially inner side; a specified length is extended from one end of the rotating shaft 2 along the axial direction of the rotating shaft 2; extending by a predetermined width in the circumferential direction of the rotating shaft 2. That is, the key groove 4 is formed in a groove shape extending in the axial direction of the rotating shaft 2. The depth dimension of the key groove 4 corresponds to the height dimension of the convex key 3; the length dimension of the key groove 4 is larger than that of the convex key 3; the width dimension of the key groove 4 is smaller than the width dimension of the key 3.
As shown in fig. 2, the key groove 4 has a round-head rectangular parallelepiped shape when viewed from the side of the rotating shaft 2. More specifically, the key groove 4 has an opening in an end face of one end of the rotating shaft 2, and on the side opposite to the opening, two inner wall surfaces 4a and 4b and a groove bottom surface 4d of the key groove 4 facing each other are connected to a front end face 4c of the key groove 4 to form a smooth curved surface, that is, the inner wall surfaces 4a and 4b and the groove bottom surface 4d are gradually curved to approach each other and are then connected to the front end face 4c of the curved surface integrally. Accordingly, the opposite side of the opening of the key groove 4 is a semicircular curved surface as a whole.
As shown in fig. 2, a chamfer 6 is formed at an edge of the opening of the key groove 4, and the chamfer 6 is formed at the end of two opposing inner wall surfaces 4a and 4b parallel to a center line 200 of the key groove 4 (located at the center in the width direction of the key groove 4 and parallel to the axis of the rotating shaft 2).
In the chamfer 6, the end portions of the inner wall surface 4a and the inner wall surface 4b are formed as inclined surfaces that are inclined to the outside of the key groove 4, for example, at 45 degrees with respect to the center line 200 of the key groove 4. Thus, the opening portion of the key groove 4 is configured to have a larger width dimension as it approaches the outer edge of the opening.
Further, as shown in fig. 2, the width W3 of the projecting key 3 is larger than the width W4 of the key groove 4, but smaller than the width W2 of the opening of the key groove 4 on the end surface of the rotary shaft 2.
Next, an operation of assembling the rotary shaft 2 and the resolver rotor 1 will be described.
First, the end (upper end in fig. 2) of the rotating shaft 2 where the key groove 4 is formed is brought close to the end (lower end in fig. 2) of the resolver rotor 1, while the opening of the key groove 4 on the rotating shaft 2 is aligned with the lower end position of the key 3 on the resolver rotor 1.
Then, after the two corners of the lower end of the key 3 are brought into contact with the inclined surfaces of the chamfers 6 of the key groove 4, the resolver rotor 1 is pressed to fit the key 3 into the key groove 4. In this process, since the opening width W2 of the key groove 4 in the end surface of the rotary shaft 2 is larger than the width W3 of the key 3, the key 3 easily enters the key groove 4, and thereafter, when the key 3 is pushed into the narrowed key groove 4 along the slope of the chamfer 6, the key is elastically deformed after being pushed in the width direction to narrow the notch 5 formed in the key 3, so that the width W3 of the key 3 is reduced and pushed into the key groove 4. When the key 3 is completely pressed into the key groove 4, the assembling operation is finished.
After being fitted into the key groove 4, the key 3 is expanded in the width direction by the elastic restoring force, and both side walls thereof are brought into contact with both inner wall surfaces 4a and 4b of the key groove 4, whereby the resolver rotor 1 and the rotating shaft 2 are tightly fitted together.
In the key groove 4, stress tends to concentrate at the corners where the inner wall surface 4a, the inner wall surface 4b, and the groove bottom surface 4d are connected to the front end surface 4 c. In contrast, in the present embodiment, the key groove 4 is configured such that the inner wall surface 4a, the inner wall surface 4b, and the groove bottom surface 4d are all formed as smooth curved surfaces without corner portions, and therefore the stress can be dispersed.
As described above, the connection structure between the resolver rotor 1 and the rotating shaft 2 according to the present embodiment has advantages of simple structure and easy assembly work. Specifically, the key 3 of the resolver rotor 1 can be easily fitted into the key groove 4 of the rotating shaft 2, and even when there is a difference in the dimensions of the key 3 and the key groove 4, the key 3 and the key groove 4 can be easily fitted to each other.
The present invention is not limited to the above embodiments, and various modifications and changes can be made.
For example, in the above embodiment, the key groove 4 is configured such that the two inner wall surfaces 4a and 4b and the connecting portion between the groove bottom surface 4d and the leading end surface 4c are both smooth curved surfaces having no corner portion, but the present invention is not limited to this, and the key groove 4 may be configured such that the groove bottom surface 4d and the leading end surface 4c are connected so as to intersect with each other (that is, the connecting portion is formed with a corner portion), and the connecting portion between the two inner wall surfaces 4a and 4b and the leading end surface 4c is a smooth curved surface having no corner portion. Alternatively, the key groove 4 may be configured such that the front end face 4c has a planar shape, and the two inner wall surfaces 4a and 4b and the groove bottom surface 4d intersect with the front end face 4c to be connected (that is, the connecting portion is formed with a corner portion).
Claims (2)
1. A coupling structure between a resolver rotor and a rotating shaft, wherein a projecting key is formed on an inner circumferential surface of the resolver rotor, the projecting key extending a predetermined length in an axial direction thereof, extending a predetermined width in a circumferential direction thereof, and projecting radially inward therefrom, a key groove is formed on an outer circumferential surface of the rotating shaft, the key groove extending the predetermined length in the axial direction thereof, extending the predetermined width in the circumferential direction thereof, and being recessed radially inward therefrom, and the projecting key is fitted into the key groove to fixedly couple the resolver rotor and the rotating shaft, the coupling structure comprising:
the key is formed with a notch depressed from a protruding end thereof to a radially outer side of the resolver rotor,
the key groove has an opening on the end face of one end of the rotating shaft, a chamfer is formed on the end edge of the opening, the chamfer is arranged at the end parts of two opposite inner wall surfaces of the key groove,
the width dimension of the convex key is larger than the width dimension of the key groove and smaller than the width dimension of the opening of the key groove on the end surface of the rotating shaft.
2. The connection structure between the rotor and the shaft of the resolver according to claim 1, wherein:
the key groove is configured such that the two inner wall surfaces facing each other are connected to a front end surface of the key groove on a side facing the opening to form a smooth curved surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921720870.0U CN210724363U (en) | 2019-10-14 | 2019-10-14 | Connection structure between rotary transformer rotor and rotating shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921720870.0U CN210724363U (en) | 2019-10-14 | 2019-10-14 | Connection structure between rotary transformer rotor and rotating shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210724363U true CN210724363U (en) | 2020-06-09 |
Family
ID=70935927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921720870.0U Active CN210724363U (en) | 2019-10-14 | 2019-10-14 | Connection structure between rotary transformer rotor and rotating shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210724363U (en) |
-
2019
- 2019-10-14 CN CN201921720870.0U patent/CN210724363U/en active Active
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