CN219513899U - Output shaft assembly with insert injection molding body and motor using same - Google Patents
Output shaft assembly with insert injection molding body and motor using same Download PDFInfo
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- CN219513899U CN219513899U CN202320107589.XU CN202320107589U CN219513899U CN 219513899 U CN219513899 U CN 219513899U CN 202320107589 U CN202320107589 U CN 202320107589U CN 219513899 U CN219513899 U CN 219513899U
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- injection molding
- output shaft
- shaft body
- shaft assembly
- groove
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The utility model discloses an output shaft assembly with an insert injection molding body and a motor using the same, comprising: the shaft comprises a shaft body, a metal elastic sheet clamped and embedded on the outer side wall of the shaft body, and an injection molding body which is injection molded on the outer side of the shaft body and covers the metal elastic sheet; wherein, an annular caulking groove for embedding a metal spring plate is prefabricated on the outer side wall of the shaft body; and the circumferential edge of the metal elastic sheet protrudes from the outer wall surface of the injection molding part of the shaft body and the injection molding body. The utility model can increase the friction torque of the output shaft assembly and improve the stability of the sliding friction torque of the motor.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to an output shaft assembly with an insert injection molding body and a motor using the output shaft assembly.
Background
Half of the output shaft assembly of the conventional stepping motor with the friction mechanism is formed by directly injection molding the output shaft and the injection molding body through a die, and certain friction force and biting force are formed between the notch surface on the output shaft and the injection molding body, so that the output shaft and the injection molding body cannot radially rotate. An output shaft assembly with an injection bearing is disclosed, for example, in CN214499745U, wherein a plurality of shoulders are formed on the output shaft, an annular groove is formed by each two adjacent shoulders, and engagement with the injection bearing is formed by the annular groove, thereby improving the firmness of the structure formed between the output shaft and the injection bearing.
For the output shaft assembly, since the output shaft is a metal piece and the injection molded gear is a plastic piece, the expansion coefficients of the metal piece and the plastic are greatly different, and in such a case, rapid and extreme changes in temperature often cause the part of the over-molded metal region to crack due to stress.
In addition, when the output shaft assembly is cooled by injection molding, the shrinkage levels formed by the output shaft assembly and the output shaft assembly are inconsistent, the outer layer of the plastic part is firstly cooled, solidified and shrunk when the output shaft is heated by injection molding, the core layer of the output shaft assembly is still possibly a hot melt, and thus the shrinkage of the plastic part is limited by the core layer, the injection molding is poor, and the friction moment is affected. Therefore, in order to solve the above problems, as in the solution disclosed in the above publication, in order to increase the friction torque, a plurality of annular grooves are usually disposed on the output shaft, but it is found through practical use that the more the annular grooves are designed, the spacing between the annular grooves is reduced, so as to cause the problem of uneven injection molding, thereby reducing the stability of the sliding friction torque of the motor.
Moreover, in the case of arranging a plurality of annular grooves on the output shaft, after the motor stress protection mechanism has too many times of action, the situation that the sliding friction moment is unstable (durability) exists, so that the motor load stress standard is reduced until the motor fails, and the moment performance of the motor is affected.
Therefore, for the structure of the output shaft and the injection molding body by adopting the insert injection molding process, it is also necessary to increase the friction torque of the output shaft of the stepping motor and improve the stability of the sliding friction torque of the motor through the optimization of the structure.
Disclosure of Invention
The first object of the present utility model is to provide an output shaft assembly with an insert injection molding body, so as to solve the technical problems of increasing the friction torque of the output shaft assembly and improving the stability of the sliding friction torque of a motor.
A second object of the present utility model is to provide a motor to solve the technical problems of increasing the friction torque of the output shaft assembly and improving the stability of the sliding friction torque of the motor.
The output shaft assembly with the insert injection molding body is realized by the following steps:
an output shaft assembly with an insert injection molding, comprising: the shaft comprises a shaft body, a metal elastic sheet clamped and embedded on the outer side wall of the shaft body, and an injection molding body which is injection molded on the outer side of the shaft body and covers the metal elastic sheet; wherein the method comprises the steps of
An annular caulking groove for embedding a metal spring plate is prefabricated on the outer side wall of the shaft body; and
the circumferential edge of the metal elastic sheet protrudes from the outer wall surface of the injection molding part of the shaft body and the injection molding body.
In an alternative embodiment of the present utility model, the thickness of the metal spring is greater than the width of the annular caulking groove along the axial direction of the shaft body, so that the annular caulking groove of the metal spring is in interference fit.
In an alternative embodiment of the utility model, the metal spring plate is provided with a U-shaped assembling groove for being in clamping fit with the shaft body;
the notch of the U-shaped assembly groove is positioned on the circumferential edge of the metal elastic sheet.
In an alternative embodiment of the utility model, the groove width of the U-shaped fitting groove is larger than the outer diameter of the shaft body at the position corresponding to the annular caulking groove.
In an alternative embodiment of the utility model, the difference between the groove width of the U-shaped assembly groove and the outer diameter of the part of the shaft body corresponding to the annular caulking groove is 0.5-1 mm.
In an alternative embodiment of the present utility model, the cross section of the metal elastic sheet along the radial direction of the shaft body is plum blossom-shaped; and
the circumference border of metal shell fragment is equipped with a plurality of indent grooves at intervals.
In an alternative embodiment of the present utility model, the injection molded body is an injection molded gear; and
the outer diameter of the metal elastic sheet is smaller than the diameter of the root circle of the injection molding gear.
In an alternative embodiment of the utility model, the thickness of the metal elastic sheet along the axial direction of the shaft body accounts for 1/6-1/4 of the shaft length of the injection molding body.
In an alternative embodiment of the present utility model, the two end surfaces of the part of the metal elastic sheet protruding from the shaft body along the axial direction of the shaft body are respectively formed with grains suitable for being engaged with the injection molding body.
The motor of the utility model is realized as follows:
an electric machine, comprising: the output shaft assembly with the insert injection molding body.
By adopting the technical scheme, the utility model has the following beneficial effects: according to the output shaft assembly with the insert injection molding body and the motor using the same, the injection molding body is injected outside the metal elastic sheet and the output shaft through the injection molding mode, and under the structure, the friction torque of the integral output shaft assembly is between the metal elastic sheet and the axial end face of the annular caulking groove of the output shaft, and the friction torque generated between the injection molding body and the shaft body made of metal in the conventional technology is effectively increased compared with the friction torque generated between the injection molding body and the shaft body made of metal in the conventional technology, and the stability of the sliding friction torque of the motor is improved.
In addition, the integral output shaft assembly only needs to be prefabricated with the annular caulking groove on the shaft body to be matched with the metal elastic sheet, so that compared with the condition that a plurality of annular caulking grooves are arranged on the shaft body at intervals in the prior art, the integral output shaft assembly can improve the use strength of the integral output shaft on the one hand, and can improve the processing convenience of the output shaft on the other hand, and the problem of complicated working procedures caused by grooving processing is solved.
Drawings
FIG. 1 is a schematic view of an exploded construction of an output shaft assembly with an insert injection molding of the present utility model;
FIG. 2 is a schematic view of the overall structure of the output shaft assembly with insert injection molding of the present utility model;
FIG. 3 is a schematic cross-sectional view of an output shaft assembly with an insert injection molded body of the present utility model;
FIG. 4 is a schematic view of the structure of the shaft body of the output shaft assembly with insert injection molding of the present utility model;
FIG. 5 is a first view structural schematic diagram of a metal spring of an output shaft assembly with an insert molding of the present utility model;
FIG. 6 is a schematic view of a second view angle structure of a metal spring of the output shaft assembly with insert injection molding of the present utility model;
fig. 7 is a schematic view of a third view angle structure of a metal spring plate of an output shaft assembly with an insert injection molding body according to the present utility model.
In the figure: the shaft comprises a shaft body 1, an annular caulking groove 11, a metal spring plate 2, a U-shaped assembly groove 21, a concave groove 22 and an injection molding body 3.
Detailed Description
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
Example 1:
referring to fig. 1 to 7, the present embodiment provides an output shaft assembly with an insert injection molding body, including: the shaft comprises a shaft body 1, a metal elastic sheet 2 clamped and embedded on the outer side wall of the shaft body 1, and an injection molding body 3 which is injection molded on the outer side of the shaft body 1 and covers the metal elastic sheet 2; that is to say, the injection molding body 3, the metal elastic sheet 2 and the shaft body 1 are mutually connected by means of insert injection molding. The shaft body 1 itself is also made of metal.
Based on the above structure, further, the outer side wall of the shaft body 1 is prefabricated with an annular caulking groove 11 for embedding the metal spring plate 2, the metal spring plate 2 is matched with the annular caulking groove 11 in a clamping way, and on the basis that the metal spring plate 2 and the annular caulking groove are assembled in place, the circumferential edge of the metal spring plate 2 protrudes from the outer wall surface of the injection molding part of the shaft body 1 and the injection molding body 3, and the metal spring plate 2 protrudes from the outer wall surface of the shaft body 1 to form the engagement connection with the injection molding body 3 in the injection molding matching process.
It should be noted that, in the present embodiment, the thickness e of the metal spring 2 is greater than the width d of the annular caulking groove 11 along the axial direction of the shaft body 1, so that the annular caulking groove 11 of the metal spring 2 is in interference fit. Because the friction torque of the integral output shaft assembly is between the metal elastic sheet and the axial end face of the annular caulking groove of the output shaft, and the metal elastic sheet 2 and the shaft body 1 are both made of metal, compared with the friction torque generated between the injection molding body 3 and the shaft body 1 made of metal in the conventional technology, the friction torque of the integral output shaft assembly can be effectively increased and the stability of the sliding friction torque of the motor can be improved under the interference fit structure of the shaft body 1 and the metal elastic sheet 2.
For improving the firmness of the matching structure formed by the metal elastic sheet 2 and the injection molding body 3, the thickness of the metal elastic sheet 2 along the axial direction of the shaft body 1 in the embodiment accounts for 1/6-1/4 of the shaft length of the injection molding body 3, so that the engagement area of the injection molding body 3 and the metal elastic sheet 2 is ensured.
Regarding the metal spring 2 used in the present embodiment, considering that the metal spring 2 needs to be simultaneously coupled with the shaft body 1 and the injection molding body 3, an optional metal spring 2 is illustrated in the following drawings:
in general shape, the metal spring plate 2 has a plum blossom-shaped cross section along the radial direction of the shaft body 1; of course, the plum blossom shape can be replaced by a star shape or a different shape, the shape of the metal spring 2 is not limited in this embodiment, that is, as long as the structure that a plurality of concave grooves 22 are arranged at intervals on the circumferential edge of the metal spring 2 meets the use requirement of this embodiment, the design of the plurality of concave grooves 22 can increase the contact area between the injection molding body 3 and the metal spring 2, so as to form the deep engagement between the metal spring 2 and the injection molding body 3 on the radial surface, and thereby, the relative rotation between the metal spring 2 and the injection molding body 3 in the radial direction can be limited.
In particular, the metal spring plate 2 is provided with a U-shaped assembly groove 21 for clamping fit with the shaft body 1; the notch of the U-shaped assembly groove 21 is positioned on the circumferential edge of the metal elastic sheet 2. The U-shaped assembly groove 21 is designed to facilitate the rapid assembly of the metal spring 2 and the shaft body 1.
On the basis of the above structure, further, the groove width b of the U-shaped fitting groove 21 is larger than the outer diameter c of the shaft body 1 at the position corresponding to the annular caulking groove 11. In an alternative embodiment, the difference between the groove width b of the U-shaped fitting groove 21 and the outer diameter c of the shaft body 1 at the location corresponding to the annular recess 11 is 0.5 to 1mm. With such a structural design, the metal spring plate 2 and the shaft body 1 can be assembled in place rapidly.
In addition, in an alternative implementation case, in order to further improve the firmness of the engagement connection structure formed between the metal elastic sheet 2 and the injection molding body 3, lines suitable for engagement with the injection molding body 3 are formed on two end faces of the portion, along the axial direction of the shaft body 1, of the portion, where the metal elastic sheet 2 protrudes from the shaft body 1 in the embodiment. The line here can be many protruding muscle on metal shrapnel 2, and by adjacent protruding muscle formation recess, and the structure that so unsmooth is alternate makes metal shrapnel 2 and injection molding 3 based on during the inserts injection molding process, and the injection molding material can enter into above-mentioned recess, makes injection molding material and metal shrapnel 2 degree of depth interlock from this.
In summary, for the shaft body 1 of the present embodiment, only one annular caulking groove 11 is required to be prefabricated on the shaft body 1 for the whole output shaft assembly, and compared with the case that a plurality of annular caulking grooves 11 are arranged on the shaft body 1 at intervals, the present utility model can improve the use strength of the whole output shaft on the one hand, and can improve the processing convenience of the output shaft on the other hand, so as to reduce the problem of complicated procedures caused by slotting. In addition, for the shaft body 1 of the present embodiment, the circumferential outer wall surface of the entire shaft body is in the shape of the concave groove 22 except for the annular caulking groove 11, and the other parts on the shaft body 1 are columnar structures with uniform outer diameters, so that compared with the case that a shoulder is required to be machined and formed on the shaft body 1 in the prior art, the structure of the present embodiment has low material cost and can directly reduce the machining difficulty.
Finally, it should be further noted that, depending on the application of the actual output shaft assembly, the injection molding body 3 in this embodiment may be just an injection molding gear, an injection molding bearing and an injection molding gear that are integrally molded, or just an injection molding bearing, which is not limited in any way. In this embodiment, in combination with the accompanying drawings, the injection molding body 3 is an injection molding gear, and based on this, the outer diameter a of the metal elastic sheet 2 is smaller than the root circle diameter of the injection molding gear. In terms of the structure of the injection molding gear, a clamping force can be generated between the metal elastic sheet 2 and the axial end face of the annular caulking groove 11 of the output shaft, so that the friction torque between the metal elastic sheet 2 and the axial end face of the annular caulking groove 11 of the output shaft is smaller than the strength required when the injection molding gear breaks teeth, when the external impact force is larger than the friction torque between the metal elastic sheet 2 and the axial end face of the annular caulking groove 11 of the shaft body 1, the metal elastic sheet 2 can drive the injection molding body 3 to move relative to the axial end face of the annular caulking groove 11 of the shaft body 1, and at the moment, the impact force transmitted to the injection molding body 3 is equal to the friction torque between the metal elastic sheet 2 and the axial end face of the annular caulking groove 11 of the shaft body 1, so that the problem that the injection molding body 3 breaks teeth, such as the injection molding gear, can be avoided.
Example 2:
on the basis of the output shaft assembly with the insert injection molding body of embodiment 1, this embodiment provides a motor including: the output shaft assembly with insert injection molding of example 1.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present utility model, and are more fully described herein with reference to the accompanying drawings, in which the principles of the present utility model are shown and described, and in which the general principles of the utility model are defined by the appended claims.
In the description of the present utility model, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present utility model, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.
Claims (10)
1. An output shaft assembly with an insert injection molding, comprising: the shaft comprises a shaft body, a metal elastic sheet clamped and embedded on the outer side wall of the shaft body, and an injection molding body which is injection molded on the outer side of the shaft body and covers the metal elastic sheet; wherein the method comprises the steps of
An annular caulking groove for embedding a metal spring plate is prefabricated on the outer side wall of the shaft body; and
the circumferential edge of the metal elastic sheet protrudes from the outer wall surface of the injection molding part of the shaft body and the injection molding body.
2. The output shaft assembly with insert injection molding of claim 1, wherein the thickness of the metal spring is greater than the width of the annular groove along the axial direction of the shaft body, such that the metal spring annular groove is in an interference fit.
3. The output shaft assembly with insert injection molding of claim 1 or 2, wherein the metal spring has a U-shaped fitting groove for snap-fit engagement with the shaft body;
the notch of the U-shaped assembly groove is positioned on the circumferential edge of the metal elastic sheet.
4. The output shaft assembly with insert injection molding of claim 3, wherein the U-shaped mounting groove has a groove width greater than an outer diameter of a portion of the shaft body corresponding to the annular insert groove.
5. The output shaft assembly with insert injection molding body according to claim 4, wherein a difference between a groove width of the U-shaped fitting groove and an outer diameter of a portion of the shaft body corresponding to the annular caulking groove is 0.5 to 1mm.
6. The output shaft assembly with insert injection molding body according to claim 1, wherein the metal spring plate has a quincuncial cross section along the radial direction of the shaft body; and
the circumference border of metal shell fragment is equipped with a plurality of indent grooves at intervals.
7. The output shaft assembly with insert injection molding of claim 6, wherein the injection molding is an injection molded gear; and
the outer diameter of the metal elastic sheet is smaller than the diameter of the root circle of the injection molding gear.
8. The output shaft assembly with insert injection molding body according to claim 1, wherein the thickness of the metal spring plate along the axial direction of the shaft body is 1/6-1/4 of the shaft length of the injection molding body.
9. The output shaft assembly with the insert injection molding body according to claim 1, wherein the portions of the metal spring plates protruding from the shaft body are respectively formed with lines suitable for being meshed with the injection molding body on two end faces of the shaft body along the axial direction of the shaft body.
10. An electric machine, comprising: an output shaft assembly with insert injection molded body as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320107589.XU CN219513899U (en) | 2023-02-03 | 2023-02-03 | Output shaft assembly with insert injection molding body and motor using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320107589.XU CN219513899U (en) | 2023-02-03 | 2023-02-03 | Output shaft assembly with insert injection molding body and motor using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219513899U true CN219513899U (en) | 2023-08-11 |
Family
ID=87527878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320107589.XU Active CN219513899U (en) | 2023-02-03 | 2023-02-03 | Output shaft assembly with insert injection molding body and motor using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219513899U (en) |
-
2023
- 2023-02-03 CN CN202320107589.XU patent/CN219513899U/en active Active
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