Geared step motors and electronics

Abstract

The present invention provides a geared stepper motor. The geared stepper motor comprises: a case having an opening formed at the top; a motor part mounted at the bottom of the case and having a rotating shaft; a reduction gear train composed of a plurality of gear parts coupled to the rotating shaft and outputting rotational force of the motor part; a cover that seals the opening of the case; and an output gear located at the bottom of the cover and meshing with the reduction gear train and rotating together with an output shaft penetrating the cover. In this geared stepper motor, an elastic member having a predetermined elastic force is interposed between the output gear and the bottom surface of the cover.

Description

Technology Field

[0001] The present invention relates to a geared stepper motor, and more specifically, to a geared stepper motor and an electronic device that improves the strength of the gear and increases the durability of the output shaft by installing an elastic member so that the shaft support part of the output shaft and the number of shafts are always supported with the same area regardless of the product installation direction. Background Technology

[0002] Generally, a geared step motor consists of a step motor and a gear.

[0003] A stepper motor is a motor that rotates at a constant angle in response to an electrical pulse signal. It enables precise position control and is primarily used in automation equipment, robots, and precision instruments.

[0004] A reduction gear is a device that reduces the rotational speed of a motor and increases torque. When used with a stepper motor, it allows for high torque along with precise position control.

[0005] A geared stepper motor combines a stepper motor and a reduction gear into a single case.

[0006] These geared stepper motors may cause the following problems depending on the usage position.

[0007] In a geared stepper motor, when the output shaft is positioned in an upward direction with the stator at the bottom, one end of the output shaft is supported by the lower stator, and a portion of the circumference of the output shaft is stably supported by the bearing.

[0008] However, when the output shaft is in the downward direction, the output shaft is deflected downward by gravity, and a part of the output shaft is separated from the stator that has been repositioned upward, and the area of ​​the circumference of a part of the output shaft that is supported by the bearing is reduced.

[0009] Therefore, depending on the installation direction, instability occurs in the shaft support structure due to changes in the support area of ​​the shaft support and bearing parts.

[0010] This involves a simultaneous shift in the position of the gear fixed to the output shaft, resulting in a change in the meshing position with the mating gear engaged with the output shaft, which in turn affects the reduction in strength of the reduction gear.

[0011] In addition, the lifespan of the geared stepper motor may be shortened due to the above-mentioned problems.

[0012] In conclusion, while conventional geared stepper motors are useful devices capable of achieving precise position control and high torque, they have the problem that their lifespan can be shortened due to output shaft movement and gear position shifting depending on the operating position. Prior art literature

[0013] Republic of Korea Published Patent Publication No. 10-2017-0068050 (Publication Date: June 19, 2017) The problem to be solved

[0014] The present invention has been devised to solve the aforementioned problems, and the objectives of the present invention are as follows.

[0015] The objective of the present invention is to provide a geared stepper motor and an electronic device capable of solving problems caused by output shaft movement of a geared stepper motor, and extending the product's lifespan and improving performance by providing a stable support structure.

[0016] In other words, the present invention aims to provide a geared stepper motor and an electronic device capable of suppressing the movement of the output shaft and securing a stable support structure by interposing an elastic member between the output gear and the bottom surface of the cover, and enhancing the stability of the output shaft by positioning one end of the output shaft to contact the upper yoke surface of the motor part and the other end to penetrate the cover, and proposing that the elastic member be implemented in various forms such as a wave-shaped thin plate, a spiral wire, or a form having multiple elastic parts, and presenting a structure that provides elastic force while rotatingly supporting the output shaft by combining a ring-shaped shaft and multiple elastic upright parts in the shaft hole of the cover.

[0017] The objectives of the present invention are not limited to those mentioned above, and other objectives and advantages of the present invention not mentioned may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0018] To achieve the above objectives, the present invention provides a geared step motor.

[0019] The above geared step motor comprises: a case having an opening formed at the top; a motor unit mounted at the bottom of the case and having a rotating shaft; a reduction gear train composed of a plurality of gear units coupled to the rotating shaft and outputting the rotational force of the motor unit; a cover that seals the opening of the case; and an output gear located at the bottom of the cover and meshing with the reduction gear train and rotating together with an output shaft penetrating the cover.

[0020] An elastic member having a predetermined elastic force is interposed between the output gear and the bottom surface of the cover.

[0021] Here, one end of the output shaft protrudes downward along the output gear, and

[0022] The other end of the output shaft is positioned to protrude upward relative to the output gear and penetrate the cover, and

[0023] The above elastic member is,

[0024] It is positioned on the upper surface of the output gear and fitted onto the output shaft, and

[0025] It is desirable to apply pressure along one end direction of the above output shaft.

[0026] And, one end of the above output shaft is,

[0027] It is desirable that it be in contact with the upper yoke surface of the above motor part.

[0028] In addition, the elastic member is formed of a thin plate having a wave shape and a through hole formed through which the output shaft passes, and

[0029] In the above through hole,

[0030] The above output shaft can be penetrated.

[0031] In addition, the elastic member is,

[0032] It may be a wire wound in a spiral shape around the outer circumference of the output shaft.

[0033] In addition, the elastic member is,

[0034] A plurality of elastic parts having elastic force may be formed at multiple locations on the outer circumference, which are positioned through the output shaft.

[0035] In addition, the above cover has an axial hole through which the output shaft passes, and

[0036] The elastic member is installed in the above shaft hole,

[0037] The above elastic member is,

[0038] A ring-shaped shaft that rotatably supports the output shaft, and

[0039] A plurality of elastic upright members may be provided that extend outwardly downward from one end of the above bearing and support the output gear.

[0040] In addition, it is preferable that the output shaft and the output gear are formed as a single unit.

[0041] In another embodiment, the present invention provides an electronic device comprising the above-described geared step motor. Effects of the invention

[0042] Through the means for solving the above problem, the present invention can improve the stability of the output shaft. By interposing an elastic member between the output gear and the bottom surface of the cover to suppress movement of the output shaft and secure a stable support structure, a structure resistant to external shocks or vibrations is provided. By positioning one end of the output shaft to contact the upper yoke surface of the motor part and the other end to penetrate the cover, the stability of the output shaft is enhanced, thereby maintaining precise meshing of the gears and reducing malfunctions.

[0043] Furthermore, the present invention can extend the lifespan of the gear. Improved stability of the output shaft reduces gear meshing failures, thereby decreasing gear wear and extending the gear's lifespan. By reducing unnecessary forces applied to the gear due to movement of the output shaft, a decrease in gear strength can be prevented.

[0044] In addition, the reliability of geared stepper motors can be improved. It reduces malfunctions by enhancing output shaft stability and extending gear life, and strengthens durability through a structure resistant to external shocks and vibrations, as well as extended gear life.

[0045] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below. Brief explanation of the drawing

[0046] FIG. 1 is an assembled perspective view showing the configuration of a geared step motor according to the present invention. FIG. 2 is another perspective view showing the configuration of a geared step motor according to the present invention. FIG. 3 is an exploded perspective view showing the configuration of a geared step motor according to the present invention. FIG. 4a is a cross-sectional view showing the configuration of a geared step motor according to the present invention. Figure 4b is an enlarged cross-sectional view showing A of Figure 4a. FIG. 5 is a perspective view showing a first embodiment of an elastic member according to the present invention. FIG. 6 is a perspective view showing a geared stepper motor with the elastic member of FIG. 5 installed. FIG. 7 is a perspective view showing the state in which an elastic member is installed on the output shaft. FIG. 8 is a perspective view showing the elastic member of FIG. 5 interposed between the bottom surface of the cover and the top surface of the output gear. FIG. 9 is a perspective view showing a second embodiment of an elastic member according to the present invention. FIG. 10 is a perspective view showing a geared stepper motor with the elastic member of FIG. 9 installed. FIG. 11 is a perspective view showing the elastic member of FIG. 9 installed on the output shaft. FIG. 12 is a perspective view showing the elastic member of FIG. 9 interposed between the bottom surface of the cover and the top surface of the output gear. FIG. 13 is a perspective view showing a third embodiment of an elastic member according to the present invention. FIG. 14 is a perspective view showing the elastic member of FIG. 13 installed on the output shaft. FIG. 15 is a perspective view showing the elastic member of FIG. 13 interposed between the bottom surface of the cover and the top surface of the output gear. FIG. 16 is a perspective view showing a fourth embodiment of an elastic member according to the present invention. FIG. 17 is a front view showing the elastic member of FIG. 16 installed on the output shaft. FIG. 18 is a cutaway perspective view showing the elastic member of FIG. 16 interposed between the bottom surface of the cover and the top surface of the output gear. Figure 19 is an enlarged cross-sectional view showing B of Figure 18. Specific details for implementing the invention

[0047] An embodiment of the present invention will be described with reference to the drawings.

[0048] The present invention may be implemented in various different forms, and the embodiments described herein are merely examples that clearly illustrate the features of the invention and do not limit the scope of the invention.

[0049] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and identical or similar components throughout the specification are given the same reference numerals.

[0050] In the following, the statement that any configuration is provided or arranged on the "upper (or lower)" or "upper (or lower)" means that any configuration is provided or arranged in contact with the upper (or lower) surface of the above description.

[0051] Furthermore, it is not limited to not including any other configuration between the above description and any configuration provided or placed on (or under) the description.

[0052] The geared step motor and electronic device of the present invention will be described below with reference to the attached drawings. Since the electronic device includes the geared step motor, the geared step motor will be described by including it in the description of the electronic device.

[0053] FIG. 1 is an assembled perspective view showing the configuration of a geared step motor according to the present invention. FIG. 2 is another perspective view showing the configuration of a geared step motor according to the present invention. FIG. 3 is an exploded perspective view showing the configuration of a geared step motor according to the present invention. FIG. 4a is a cross-sectional view showing the configuration of a geared step motor according to the present invention. FIG. 4b is an enlarged cross-sectional view showing A of FIG. 4a.

[0054] Referring to FIGS. 1 and FIGS. 2, the electronic device according to the present invention may include a geared step motor.

[0055] The geared step motor has a case (100) having an opening (110) formed at the top that is open. The top of the case (100) is coupled with a cover (200). The cover (200) can seal the opening (110).

[0056] An output gear (310) and an output shaft (300) are disposed inside the case (100). The other end of the output shaft (300) penetrates the cover (200). An axial hole (210) through which the output shaft (300) penetrates is formed in the cover (200).

[0057] Referring to FIG. 3, one side of the case (100) is cut. A conductive part (120) and a connector cover (130) are installed in the cut portion.

[0058] Inside the above case (100), an upper yoke (140) and a lower yoke (150) are arranged in a stacked shape.

[0059] A rotor (160) having a rotation axis (161) is disposed in the center of the upper yoke (140) and lower yoke (150).

[0060] Additionally, a reduction gear train (170) is disposed on the upper portion of the upper yoke (140). A gear plate (180) is disposed on the lower portion of the reduction gear train (170). The gear plate (180) is disposed on the upper surface of the upper yoke (140).

[0061] The above reduction gear train (170) has a plurality of gear sections. One of the plurality of gear sections is engaged with the output gear (310) in a gear manner. An output shaft (300) having a certain length along the top and bottom is integrally formed with the output gear (310).

[0062] One end of the output shaft (300) protrudes along the lower side of the output gear (310), and the upper end of the output shaft (300) protrudes along the upper side of the output gear (310) and penetrates the shaft hole (210) formed in the cover (200).

[0063] Referring to FIG. 4a and FIG. 4b, the output shaft (300) according to the present invention has first, second, and third axis bodies (301, 302, 303) formed as a single body.

[0064] The first shaft body (301) has a first outer diameter to rotate through the shaft hole (210). The second shaft body (302) is formed by creating a step at the bottom of the first shaft body (301) and has a second outer diameter smaller than the first outer diameter. The third shaft body (303) is formed by creating a step at the bottom of the second shaft body (302) and has a third outer diameter smaller than the second outer diameter.

[0065] The outer circumference of the second shaft body (302) is provided in a shape through which the output gear (310) passes.

[0066] The end of the third axis body (303) can be inserted into a rotation hole (181) formed in the gear plate (180) and rotated to be supported.

[0067] In addition, in the geared step motor according to the present invention, an elastic member (400) having a predetermined elastic force is interposed between the output gear (310) and the bottom surface of the cover (200). The elastic member (400) can provide a certain elastic force between the bottom surface of the cover (200) and the top surface of the output gear (310).

[0068] And, one end of the output shaft (300) can come into contact with the upper surface of the upper yoke (140) of the motor part (M).

[0069] The following describes embodiments of an elastic member according to the present invention.

[0070] First embodiment

[0071] FIG. 5 is a perspective view showing a first embodiment of an elastic member according to the present invention. FIG. 6 is a perspective view showing a geared stepper motor with the elastic member of FIG. 5 installed thereon. FIG. 7 is a perspective view showing the elastic member installed on an output shaft. FIG. 8 is a perspective view showing the elastic member of FIG. 5 interposed between the bottom surface of a cover and the top surface of an output gear.

[0072] Referring to FIG. 5, a first embodiment of an elastic member (400) according to the present invention will be described.

[0073] The elastic member (400) according to the present invention is formed from a thin plate having a set thickness. A through hole (410) is formed in the elastic member (400). An output shaft (300) can pass through the through hole (410).

[0074] The through hole (410) formed in the elastic member (400) may or may not be in close contact with the outer surface of the output shaft (300) through which it passes. That is, the through hole (410) may have a hole shape corresponding to the outer surface shape of the output shaft (300), or it may be formed as a square or rectangular hole shape.

[0075] Additionally, the elastic member (400) may be formed of a metal or an elastic plastic material.

[0076] Referring to FIGS. 6 and 7, one end of the output shaft (300) according to the present invention protrudes downward relative to the output gear (310), and the other end of the output shaft (300) protrudes upward relative to the output gear (310) and is positioned to penetrate the cover (200) shown in FIG. 8.

[0077] Also, a step portion may be formed between the upper surface of the output gear (310) and the output shaft (300).

[0078] The output shaft (300) can pass through the through hole (410) of the elastic member (400). The elastic member (400) can be supported on the upper surface of the output gear (310) while fitted onto the output shaft (300).

[0079] Referring to FIG. 8, the other end of the output shaft (300) is rotatably supported by passing through the shaft hole (210) formed in the cover (200).

[0080] At this time, the elastic member (400) can be positioned between the upper surface of the output gear (310) and the lower surface of the cover (200).

[0081] Accordingly, the elastic member (400) can elastically support the space between the output gear (310) and the cover (200).

[0082] That is, the elastic member (400) is positioned on the upper surface of the output gear (310), fitted onto the output shaft (300), and is mounted along one end of the output shaft (300).

[0083] The first embodiment of the elastic member (400) according to the present invention can improve the performance of a geared step motor through the following operations and effects.

[0084] The output shaft's movement is suppressed. The elastic member (400) is interposed between the upper surface of the output gear (310) and the lower surface of the cover (200) to suppress the movement of the output shaft (300). The elastic member (400) is fitted onto the output shaft (300) and supported on the upper surface of the output gear (310) to stably hold the movement of the output shaft (300). This prevents the output shaft (300) from shaking due to external shocks or vibrations and allows it to maintain stable rotational movement.

[0085] In addition, it improves the stability of the gear mesh. The elastic member (400) maintains a stable meshing state between the output gear (310) and the mating gear by suppressing the movement of the output shaft (300). This can extend the lifespan of the geared step motor by preventing noise generation and gear wear caused by poor gear meshing.

[0086] Additionally, the elastic member (400) can reduce friction loss by preventing the output gear (310) from directly contacting the cover (200).

[0087] In addition, the thin sheet-shaped elastic member (400) can support the output shaft (300) over a relatively large area to increase stability.

[0088] In addition, if the elastic member (400) is formed as a thin plate and has a wave shape with respect to the horizontal direction, the following advantages are provided.

[0089] The wave shape can effectively respond to forces applied from various directions, not just the horizontal direction. This allows the elastic member to flexibly deform to absorb shocks and maintain the stability of the output shaft, even if external impacts or vibrations occur from various angles.

[0090] The thin-plate elastic member (400) contacts a large area between the output gear (310) and the cover (200), which supports the output shaft (300) more stably.

[0091] The wave shape provides stable support by ensuring elasticity while maintaining this wide contact area.

[0092] The wave shape has the effect of absorbing and dispersing external impact energy. As the elastic member (400) deforms, it absorbs impact energy, and as the energy is dispersed along the curvature of the wave, it can reduce the amount of impact transmitted to the output shaft.

[0093] Since the wave shape has a longer length compared to a flat plate of the same area, it can secure higher elasticity. This can support the output shaft (300) more stably and increase resistance to external forces.

[0094] Second embodiment

[0095] FIG. 9 is a perspective view showing a second embodiment of an elastic member according to the present invention. FIG. 10 is a perspective view showing a geared stepper motor with the elastic member of FIG. 9 installed thereon. FIG. 11 is a perspective view showing the elastic member installed on an output shaft. FIG. 12 is a perspective view showing the elastic member of FIG. 9 interposed between the bottom surface of a cover and the top surface of an output gear.

[0096] Referring to FIGS. 9 to 12, a second embodiment of the elastic member (500) according to the present invention will be described.

[0097] The elastic member (500) according to the present invention may be a wire wound in a spiral shape on the outer circumference of the output shaft (300). The wire forming the elastic member (500) may form a spiral shape and may form a certain pitch.

[0098] The elastic force can be determined according to the number of coils of the above elastic member (500).

[0099] The output shaft (300) can pass through the center formed by a spiral wire.

[0100] The inner surface of the elastic member (500) may or may not be in close contact with the outer surface of the output shaft (300). Additionally, the elastic member (500) may be formed of a metal or an elastic plastic material.

[0101] One end of the output shaft (300) according to the present invention protrudes downward along the output gear (310), and the other end of the output shaft (300) protrudes upward along the output gear (310) and is positioned to penetrate the cover (200) shown in FIG. 12.

[0102] Also, a step portion may be formed between the upper surface of the output gear (310) and the output shaft (300).

[0103] The above elastic member (500) can be supported on the upper surface of the output gear (310) while fitted onto the output shaft (300).

[0104] Referring to FIG. 12, the other end of the output shaft (300) is rotatably supported by passing through the shaft hole (210) formed in the cover (200).

[0105] At this time, the elastic member (500) can be positioned between the upper surface of the output gear (310) and the lower surface of the cover (200).

[0106] Accordingly, the elastic member (500) can elastically support the space between the output gear (310) and the cover (200).

[0107] That is, the elastic member (500) is positioned on the upper surface of the output gear (310), fitted onto the output shaft (300), and is mounted along one end direction of the output shaft (300).

[0108] A second embodiment of the elastic member (500) according to the present invention can obtain the following operations and effects by using a spiral wire.

[0109] The spiral wire elastically responds to forces applied from various directions, which may serve to protect the output shaft (300) from external shocks or vibrations. In particular, it can effectively respond to radial forces as well as axial forces, thereby increasing the stability of the output shaft.

[0110] In addition, the spiral wire can be simply installed by winding it around the output shaft (300), which can facilitate the assembly process and reduce production costs, and can also be advantageous for miniaturizing the geared step motor by occupying less installation space compared to elastic members of complex shapes.

[0111] In addition, the elastic force can be easily changed by adjusting the number of turns of the spiral wire, and this can provide customized elastic force depending on the purpose of use of the stepper motor.

[0112] In addition, the elasticity can be adjusted in a more diverse way by controlling the material and thickness of the wire.

[0113] Additionally, the spiral wire contacts the outer surface of the output shaft (300), which can reduce shaking of the output shaft and maintain stable rotational movement, and in particular, the supporting force of the output shaft can be optimized by adjusting the pitch and number of turns of the wire.

[0114] Additionally, the spiral wire may prevent direct contact between the output gear (310) and the cover (200), thereby reducing friction loss, which may increase the efficiency of the geared step motor and reduce heat generation.

[0115] Third embodiment

[0116] FIG. 13 is a perspective view showing a third embodiment of an elastic member according to the present invention. FIG. 14 is a perspective view showing the elastic member of FIG. 13 installed on an output shaft. FIG. 15 is a perspective view showing the elastic member of FIG. 13 interposed between the bottom surface of a cover and the top surface of an output gear.

[0117] Referring to FIGS. 13 to 15, a third embodiment of an elastic member (600) according to the present invention will be described.

[0118] The above elastic member (600) is positioned through the output shaft (300), and a plurality of elastic parts having elastic force may be formed at multiple locations on the outer circumference.

[0119] In detail, the elastic member (600) is formed as a plate having a certain thickness. The elastic member (600) may be composed of a ring-shaped central body (610), extensions (620) extending outwardly at multiple locations on the outer circumference of the central body (610), and elastic portions (630) formed at each end of the extensions (620).

[0120] Here, each of the elastic parts (630) may be composed of an inclined piece (631) that extends to gradually slope upward and a bent piece (632) that is bent along the horizontal direction at the end of the inclined piece (631). The space between the inclined piece (631) and the bent piece (632) may be bent to form an angle or bent to form a curvature.

[0121] The output shaft (300) passes through the through hole (611) of the central body (610). The inner surface of the through hole (611) of the elastic member (600) may or may not be in close contact with the outer surface of the output shaft (300). Additionally, the elastic member (600) may be formed of metal or an elastic plastic material.

[0122] One end of the output shaft (300) according to the present invention protrudes downward along the output gear (310), and the other end of the output shaft (300) protrudes upward along the output gear (310) and is positioned to penetrate the cover (200) shown in FIG. 15.

[0123] Also, a step portion may be formed between the upper surface of the output gear (310) and the output shaft (300).

[0124] The above elastic member (600) can be supported on the upper surface of the output gear (310) while fitted onto the output shaft (300).

[0125] Referring to FIG. 15, the other end of the output shaft (300) is rotatably supported by passing through the shaft hole (210) formed in the cover (200).

[0126] At this time, the elastic member (600) can be positioned between the upper surface of the output gear (310) and the lower surface of the cover (200).

[0127] Accordingly, the elastic member (600) can elastically support the space between the output gear (310) and the cover (200).

[0128] That is, the elastic member (600) is positioned on the upper surface of the output gear (310), fitted onto the output shaft (300), and is mounted along one end of the output shaft (300).

[0129] Here, the bottom surface of the central body (610) and the extensions (620) elastically supports the top surface of the output gear (310), and the bending pieces (632) of each of the elastic parts (630) elastically support the bottom surface of the cover (200).

[0130] And, accordingly, the elastic member (600) can form an elastic flow distance between the output gear (310) and the cover (200) equal to the vertical clearance of the inclined pieces (631).

[0131] Accordingly, the elastic member (600) can elastically support the space between the output gear (310) and the cover (200).

[0132] That is, the elastic member (600) is positioned on the upper surface of the output gear (310), fitted onto the output shaft (300), and is mounted along one end of the output shaft (300).

[0133] A third embodiment of the elastic member (600) according to the present invention is configured such that extensions (620) are formed on the outer circumference of a ring-shaped central body (610), and elastic parts (630) are formed on each of these extensions (620), thereby obtaining the following operations and effects.

[0134] The elastic member (600) is composed of a central body (610), a plurality of extensions (620), and an elastic part (630), so that it can stably respond to forces applied from various directions. In particular, the elastic part (630) is composed of an inclined piece (631) and a bent piece (632), so that it can effectively distribute forces in the axial direction as well as the radial direction, thereby increasing the stability of the output shaft (300).

[0135] Additionally, the elastic member (600) has the effect of absorbing and dispersing external impact energy. As the inclined piece (631) of the elastic part (630) deforms, it absorbs impact energy, and as the energy is dispersed through the bent piece (632), the amount of impact transmitted to the output shaft (300) can be reduced. Furthermore, by absorbing vibration energy, the operational stability of the geared step motor can be increased.

[0136] In addition, the plurality of elastic parts (630) each deform independently to provide high elasticity, which can support the output shaft (300) more stably. Furthermore, the elasticity and flexibility can be varied by adjusting the shape and number of each elastic part (630).

[0137] Additionally, the elastic member (600) is positioned between the output gear (310) and the cover (200) to maintain a separation distance. This prevents the output gear from directly contacting the cover, thereby reducing friction loss and preventing gear meshing failure.

[0138] 4th embodiment

[0139] FIG. 16 is a perspective view showing a fourth embodiment of an elastic member according to the present invention. FIG. 17 is a front view showing the elastic member of FIG. 16 installed on an output shaft. FIG. 18 is a cutaway perspective view showing the elastic member of FIG. 16 interposed between the bottom surface of a cover and the top surface of an output gear. FIG. 19 is an enlarged cross-sectional view showing B of FIG. 18.

[0140] With reference to FIGS. 16 to 19, a fourth embodiment of an elastic member (700) according to the present invention will be described.

[0141] An axial hole (210) through which an output shaft (300) passes is formed in the cover (200). The elastic member (700) is installed in the axial hole (210).

[0142] A cut groove (211) is formed at the lower inner circumference of the above shaft hole (210).

[0143] The above elastic member (700) has a hollow-shaped shaft (710), fixed parts (720), and a plurality of elastic standing parts (730).

[0144] The above-mentioned bearing (710) is formed in a ring shape to rotatably support the output shaft (300).

[0145] The above fixing parts (720) are formed to protrude outwardly at multiple locations on the outer circumference of one end of the shaft (710) so as to be fitted into the cut grooves (211) formed in the shaft hole (210).

[0146] The plurality of elastic upright members (730) are extended at one end of the shaft (710) in an outward downward direction so as to be positioned between the fixed members (720) to support the output gear (310).

[0147] Referring to the above configuration, the elastic member (700) is installed in the shaft hole (210) of the cover (200). The output shaft (300) is rotatably supported by penetrating the hollow of the shaft (710) of the elastic member (700).

[0148] The upper surface of the output gear (310), which is formed integrally with the output shaft (300), can be elastically supported at the end of the elastic upright parts (730).

[0149] Here, the elastic standing parts (730) are formed to be inclined downward, thereby forming a certain elastic flow distance along the upper and lower paths.

[0150] Accordingly, the elastic member (700) can elastically support the space between the output gear (310) and the cover (200).

[0151] That is, the elastic member (700) is positioned on the upper surface of the output gear (310), fitted onto the output shaft (300), and is mounted along one end of the output shaft (300).

[0152] A fourth embodiment of the elastic member (700) according to the present invention can achieve the following operations and effects through a structure having a bearing (710), a fixed part (720), and an elastic standing part (730).

[0153] The bearing (710) can rotate and support the output shaft (300) to assist in stable rotational movement and reduce shaking of the output shaft. This can increase the operational reliability of the geared motor and reduce malfunctions.

[0154] The elastic upright member (730) may elastically support the space between the output gear (310) and the cover (200) to protect the output shaft (300) and the gear from external shocks or vibrations.

[0155] The elastic standing part (730) is tilted downward so as to elastically respond to vertical forces, which may have the effect of absorbing and dispersing impact energy.

[0156] The fixing part (720) is structured to protrude from the outer circumference of the bearing (710) and be fitted into the cut groove (211) of the shaft hole (210), so that the elastic member (700) can be easily installed on the cover (200) and stably fixed.

[0157] The elastic upright member (730) may reduce friction loss by preventing direct contact between the output gear (310) and the cover (200). This may increase the efficiency of the geared motor and reduce heat generation.

[0158] The first, second, third, and fourth embodiments of the elastic member according to the present invention described above can form a structure that elastically supports the upper surface of the output gear (310) and the lower surface of the cover (200) by forming a certain elastic flow distance.

[0159] Referring to FIGS. 4a and 4b, the output gear (310) fixed to the output shaft (300) is spaced apart from the cover (200) at a certain distance, and one end of the output shaft (300) is inserted into a rotation hole (181) formed in the gear plate (180) and rotated so that it can reach the upper yoke (140).

[0160] Depending on the installation position, if the output shaft (300) protrudes in the opposite direction to where gravity acts, one end of the output shaft (300) touches the upper surface of the upper yoke (140), so that a certain distance can be maintained from the cover (200).

[0161] The present invention can solve the problem where, when the output shaft (300) is installed so as to protrude along the direction of gravity depending on the installation position, the distance between the cover (200) and the output gear (310) is eliminated and one side of the output gear (310) comes into contact with the cover (200).

[0162] Accordingly, the position of the output gear (310) is stably maintained to increase the gear meshing with the opposing gear that meshes with the output gear (310), and one side of the output gear (310) does not come into contact with the bottom surface of the cover (200), thereby preventing a reduction in output due to friction loss between them.

[0163] In addition, one end of the output shaft (300) is passed through the rotation hole (181) of the gear plate (180) to increase the support area for rotational support, thereby effectively preventing vibrations such as shaking when the output shaft (300) rotates.

[0164] Accordingly, in the present invention, the elastic members (400, 500, 600, 700) of the first, second, third, and fourth embodiments above are configured to be elastically supported by being interposed between the upper surface of the output gear (310) and the lower surface of the cover (200), thereby allowing the output shaft (300) to always be supported in one direction so that one end of the output shaft (300) can always come into contact with the upper yoke (140). Accordingly, the support surface that is supported through the gear plate (180) can always be kept the same, and the gear meshing with the opposing gear that comes into contact with the output gear (310) can also be maintained consistently even with changes in the installation position.

[0165] The present invention is not limited to the specific preferred embodiments described above, and anyone with ordinary knowledge in the art to which the invention pertains can make various modifications without departing from the essence of the invention as claimed in the claims, and such modifications will be within the scope of the claims. Explanation of the symbols

[0166] 100 : Case 110 : Opening 120 : Conductive part 130 : Connector cover 140: Upper yoke 150 : Lower yoke 160 : Rotor 161 : Rotation axis 170 : Reduction gear train 180: Gear plate 200 : Cover 210 : Blessing 211 : Incision groove 300 : Output axis 310: Output gear 400 : Elastic member (First embodiment) 410 : Through hole 500 : Elastic member (2nd embodiment) 600 : Elastic member (3rd embodiment) 610 ; central body 620 : Extension part 630 : Elastic part 631 : Inclined section 632 : Folded piece 700 : Elastic member (4th embodiment) 710 : Blessing 720 : Fixed part 730 : Elastic upright part M: Motor section

Claims

Claim 1 A geared step motor comprising a case having an opening formed at the top, a motor unit mounted at the bottom of the case and having a rotating shaft, a reduction gear train composed of a plurality of gear units coupled to the rotating shaft and outputting the rotational force of the motor unit, a cover sealing the opening of the case, and an output gear located at the bottom of the cover and meshing with the reduction gear train and rotating together with an output shaft penetrating the cover, wherein an elastic member having a predetermined elastic force is interposed between the output gear and the bottom surface of the cover. Claim 2 A geared step motor according to claim 1, wherein one end of the output shaft protrudes downward relative to the output gear, and the other end of the output shaft protrudes upward relative to the output gear and is positioned to penetrate the cover, and the elastic member is positioned on the upper surface of the output gear and fitted onto the output shaft and is mounted along the direction of one end of the output shaft. Claim 3 A geared step motor according to any one of claims 1 to 2, wherein the elastic member is formed of a thin plate having a wave shape and a through hole through which the output shaft passes, and the output shaft passes through the through hole. Claim 4 A geared step motor according to any one of claims 1 to 2, wherein the elastic member is a wire wound in a spiral shape around the outer circumference of the output shaft. Claim 5 A geared step motor according to any one of claims 1 to 2, wherein the elastic member is disposed through the output shaft, and a plurality of elastic portions having elastic force are formed at a plurality of positions on the outer circumference. Claim 6 A geared step motor according to any one of claims 1 to 2, wherein the cover has a shaft hole through which the output shaft passes, and the elastic member is installed in the shaft hole, wherein the elastic member comprises a ring-shaped bearing that rotatably supports the output shaft and a plurality of elastic upright portions that extend outwardly downward from one end of the bearing to support the output gear. Claim 7 A geared step motor according to claim 1, characterized in that the output shaft and the output gear are integrally molded. Claim 8 An electronic device characterized by including the geared step motor of claim 1.

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