Decelerator-integrated dual-axis rotary motor

Abstract

The present invention relates to a decelerator-integrated dual-axis rotary motor. More specifically, the decelerator-integrated dual-axis rotary motor comprises: a cylindrical housing unit, both sides of which are open; a cylindrical power transfer unit provided inside the housing unit to be rotated by receiving power, and provided in a hollow shape; a planetary gear decelerator connected to one surface of the power transfer unit, and coaxially rotated by receiving power; a shaft unit exposed to both sides through the center of the housing unit, and connected to the planetary gear decelerator to receive power; and a transmission module for selectively connecting the shaft unit and the planetary gear decelerator, and changing the reduction ratio of power transferred to the shaft unit. The planetary gear decelerator is coaxially connected to the power transfer unit such that outputs are generated from both sides of the shaft unit, and is configured such that the reduction ratio can be selectively changed by the transmission module.

Description

Dual-axis rotary motor with integrated reducer

[0001] The present invention relates to a double-axis rotary motor with an integrated reducer, and more particularly, to a double-axis rotary motor with an integrated reducer in which the reducer and the motor are provided as an integrated unit so as to minimize unnecessary volume and weight within a mechanical device.

[0002] Typically, motors are used to drive devices. However, the speed provided by the motor is too fast, and the torque provided by the motor is too small to properly drive the device. This high speed exerts a strain on the device's strength, potentially shortening its lifespan. Therefore, a reducer is installed between the motor and the device to ensure smooth use of the power transmitted from the motor. However, conventional reducers, due to their size and shape, take up unnecessary weight within the device, increasing the weight of devices such as vehicles and increasing manufacturing and process costs.

[0003] As a prior art document related to such reducers, Korean Patent Publication No. 10-2024-0052426 discloses a planetary gear reducer included in an actuator.

[0004] However, according to this conventional technology, since the output shaft is configured as a double shaft, it is difficult to easily apply it to a four-wheel drive device by adjusting the reduction ratio as well as the reduction to enable gear shifting.

[0005] The present invention has been devised to solve the problems of the prior art as described above, and its purpose is to provide a rotary motor with an integrated reducer that can be applied to various types of electric devices and robots such as front-wheel and four-wheeled vehicles by minimizing volume and weight by providing an integrated reducer and a motor.

[0006] According to a preferred embodiment of the present invention, a dual-axis rotary motor with an integrated reducer comprises: a cylindrical housing part open on both sides; a cylindrical power transmission part provided inside the housing part and capable of rotation by receiving power and provided in a hollow shape; a planetary gear reducer connected to one side of the power transmission part and rotating coaxially by receiving power; a shaft part penetrating the center of the housing part and exposed on both sides, connected to the planetary gear reducer and receiving power; and a transmission module that selectively connects the shaft part and the planetary gear reducer and allows a reduction ratio of the power transmitted to the shaft part to be changed, wherein the planetary gear reducer is coaxially connected to the power transmission part so that output is generated on both sides of the shaft part, and is characterized in that the reduction ratio can be selectively changed by the transmission module.

[0007] By means of solving the above problem, the present invention enables a rotor surrounding the outer surface of a stator to rotate at high speed, thereby increasing rotational torque through a planetary gear, thereby smoothly driving a shaft with strong force, and preventing overload of the motor drive unit, thereby extending its lifespan. This improves the drivability of a carrier that carries and transports cargo or objects.

[0008] Furthermore, the present invention has the effect of achieving a compact structure with minimal volume and weight, as the rotational power of the power transmission unit is directly transmitted to the shaft via the planetary gear and sun gear, thereby eliminating the need for a separate transmission in the drive system. Furthermore, it also has economic benefits, such as minimizing electrical energy loss and significantly improving energy consumption efficiency.

[0009] In addition, the present invention has the effect of enabling the input shaft and output shaft of the reducer and the power transmission unit to be formed on the same line, and the output shaft to be configured as a double shaft, thereby easily implementing four-wheel drive.

[0010] In addition, the present invention has the effect of enabling smooth gear shifting by easily adjusting the reduction ratio as well as reduction by the reducer.

[0011] Fig. 1 is a cross-sectional view of a dual-axis rotary motor with an integrated reducer according to a first embodiment of the present invention.

[0012] Figure 2 is an exploded perspective view of a dual-axis rotary motor with an integrated reducer according to the first embodiment of the present invention.

[0013] Fig. 3 is a perspective view showing a ring gear and a gear lever of a dual-axis rotary motor with an integrated reducer according to the first embodiment of the present invention.

[0014] FIG. 4 is a side view showing the first-stage and second-stage shifting of the ring gear and shift lever of the dual-axis rotary motor with integrated reducer according to the first embodiment of the present invention.

[0015] Fig. 5 is a side view showing the planetary gear and rotor of a dual-axis rotary motor with an integrated reducer according to the first embodiment of the present invention, coupled together.

[0016] Fig. 6 is a perspective view showing a sun gear, a ratchet gear, and a shift lever of a dual-axis rotary motor with an integrated reducer according to the first embodiment of the present invention.

[0017] Fig. 7 is a perspective view showing a shaft portion of a dual-axis rotary motor with an integrated reducer according to the first embodiment of the present invention.

[0018] Fig. 8 is a perspective view showing a sun gear and a ratchet gear installed on a shaft portion of a dual-axis rotary motor with an integrated reducer according to the first embodiment of the present invention.

[0019] FIG. 9 is a side view showing a first-stage shift and a second-stage shift by a sun gear, a ratchet gear, and a shift lever installed on a shaft portion of a dual-axis rotary motor with an integrated reducer according to a first embodiment of the present invention.

[0020] The terms used in this specification will be briefly explained, and the present invention will be described in detail.

[0021] The terms used in this invention have been selected from widely used, common terms, taking into account their functions. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Therefore, the terms used in this invention should be defined based on their meaning and the overall content of the invention, rather than simply their names.

[0022] When a part of a specification is said to “include” a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0023] Below, with reference to the attached drawings, embodiments of the present invention are described in detail so that those skilled in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0024] Specific details, including the problems to be solved, means of solving them, and the effects of the invention, are included in the embodiments and drawings described below. The advantages and features of the present invention, and methods for achieving them, will become clearer with reference to the embodiments described below in detail, along with the accompanying drawings.

[0025] Hereinafter, the dual-axis rotary motor with integrated reducer of the present invention will be described in detail with reference to the attached drawings.

[0026] A dual-axis rotary motor with an integrated reducer according to a first preferred embodiment of the present invention, with reference to FIGS. 1 to 8, includes a cylindrical housing portion (100) open on both sides, a hollow cylindrical power transmission portion (200) provided inside the housing portion (100) to receive power and rotate, a planetary gear reducer (300) connected to one side of the power transmission portion (200) and receiving power to rotate coaxially, a shaft portion (400) exposed on both sides through the center of the housing portion (100) and connected to the planetary gear reducer (300) to receive power, and a transmission module (500) that allows selective connection between the shaft portion (400) and the planetary gear reducer (300) and allows a reduction ratio of power transmitted to the shaft portion (400) to be changed. In addition, the planetary gear reducer (500) is coaxially connected to the power transmission unit (200) so that output is generated from both sides of the shaft unit (400), and the reduction ratio can be selectively changed by the transmission module (500), so that a separate connecting device such as a clutch is not provided, thereby minimizing the volume and weight.

[0027] In more detail, the housing part (100) is provided with a cylindrical front case (110) and a rear case (120) that are connected front to back, and a circular hole is processed in the center of one side so that both sides are open when connected. That is, the housing part (100) is provided with a hollow shape and has a hollow portion (130), and a receiving portion (140) is provided inside so that a mechanical device for power and deceleration can be built in. In addition, the housing part (100) allows the shaft portion (400) to penetrate through the hollow portion (130) and be exposed on both sides, and bearings (150) are provided on each of the portions where the shaft portion (400) is exposed on both sides so that the shaft portion (400) can easily rotate and be connected.

[0028] Next, the power transmission unit (200) is built into the rear case (120) side of the housing unit (100) and serves to generate power by electromagnetic force. For example, the power transmission unit (200) includes a stator (210) that is formed in a hollow shape and receives power, a rotor (220) that is formed in a cylindrical shape that surrounds the outer side of the stator (210) and is rotated by the stator (210), and has a coupling hole (221) formed on one surface so that the planetary gear reducer (300) can be coupled. The stator (210) is provided with a power supply unit (211) that generates power, and allows an electromagnetic field to be generated through power supplied from the power supply unit (211). The stator (210) is provided to form a concentric axis with the housing unit (100) and is provided in a hollow shape. And, the rotor (220) is provided in a form that surrounds the stator (220), and is provided concentrically with the housing part (100). That is, the rotor (220) is rotated by an electromagnetic field generated from the stator (220) and can be rotated based on a concentric axis with the housing part (100). In addition, a plurality of fastening holes (221) are provided on one side of both sides of the rotor (220) facing the front case (110) and are arranged radially based on the central axis, and a planetary gear part (320) to be described later can be fastened to the fastening holes (221). That is, the power generated by the power transmission part (200) can be initially transmitted to the planetary gear part (320) and rotated.

[0029] Next, the planetary gear reducer (300) includes a ring gear portion (310) that is fixedly arranged in parallel with the power transmission portion (200) and is composed of a plurality of ring gears that form a concentric axis with the power transmission portion (200), a planetary gear portion (320) that is internally engaged with the inner surface of the ring gear portion (310) and is composed of a plurality of planetary gears that are radially arranged and rotate based on the central axis of the power transmission portion (200), and a sun gear portion (330) that is arranged and engages with the central portion of the planetary gear portion (320) and is composed of a plurality of sun gears that rotate by the rotation of the planetary gear portion (320). In addition, the planetary gear reducer (300) serves to reduce the RPM of the power generated from the power transmission unit (200) to improve the torque, while ensuring that the input shaft and output shaft of the power are formed in a straight line.

[0030] At this time, in this embodiment, the planetary gear reducer (300) is formed as a transmission structure consisting of one stage and two stages, and the ring gear portion (310), planetary gear portion (320), and sun gear portion (330) are provided in two each, but the transmission structure of the present invention can be implemented as a transmission structure with a larger number of stages, such as three, four, and five stages.

[0031] First, the ring gear part (310) is provided in a ring shape corresponding to the inner circumference of the housing part (100), and gear teeth are provided on the inner ring. In addition, the ring gear part (310) is composed of a first ring gear (311) for a first-speed change and a second ring gear (312) provided for a second-speed change and formed corresponding to the first ring gear (311) and arranged to be spaced apart from the front case (110). In addition, the ring gear part (310) serves to guide the rotational direction of the planetary gear part (320), and is provided as a concentric axis with the rotational axis of the power transmission part (200), thereby allowing the input shaft and the output shaft to be provided on the same line.

[0032] In addition, the planetary gear unit (320) is configured with a plurality of planetary gears that are engaged and rotated in engagement holes (221) provided in the rotor (220) of the power transmission unit (200) by planetary gear engagement members (323) provided in the shape of circular pins, and is provided to mesh with the gear teeth formed in the inner ring of the ring gear unit (310). That is, the planetary gear unit (320) can rotate in a rotational manner based on the rotational axis of the power transmission unit (200), and is formed to mesh with the ring gear unit (310) on the outside and mesh with the sun gear unit (330) on the inside. For example, the planetary gear unit (320) is composed of a first planetary gear (321) formed to mesh with the gear teeth of the first ring gear (311), and a second planetary gear (322) formed to mesh with the gear teeth of the second ring gear (312). In addition, the first planetary gear (321) and the second planetary gear (322) are each composed of three gears arranged radially based on the rotation axis, and the reference circle diameter of the first planetary gear (321) is provided to be larger than the reference circle diameter of the second planetary gear (322) so that the reduction ratios can be formed differently. In this embodiment, the case where there are three planetary gears is described as an example, but it is obvious that the number of planetary gears may be two, four, etc., within a range not exceeding the present embodiment.

[0033] In addition, the above-described sun gear portion (330) includes a plurality of sun gears (331, 332) formed so that an outer ring gear (334) is formed on an outer circumferential surface and an inner ring gear (333) is formed on an inner circumferential surface, and a plurality of ratchet gear portions (335) that are introduced into the inside of the sun gears (331, 332) and mesh with the inner ring gear (333), but can be selectively released from engagement with the inner ring gear (333) by pressurization. In addition, the ratchet gear portion (335) is coupled with the shaft portion (400) so that the power generated in the power transmission portion (200) is ultimately transmitted, and when it meshes with the inner ring gear (333), it rotates together so that the shaft portion (400) can rotate, and when the meshing with the inner ring gear (333) is released, it prevents it from rotating. For example, the sun gear part (330) is formed to have an outer ring gear (334) provided on the outer surface to mesh with the inner side of the planetary gear part (320), can rotate by the revolution of the planetary gear part (320), and is provided to be fixed to the shaft part (400). That is, the sun gear part (330) plays a role in finally transmitting the power by the power transmission part (200) to the shaft part (400). In addition, the sun gear part (330) is composed of a first sun gear (331) that is provided on the side of the first ring gear (311) and meshes with the inner side of the first planetary gear (321), and a second sun gear (332) that is provided on the side of the second ring gear (312) and meshes with the inner side of the second planetary gear (322). At this time, the first sun gear (331) and the second sun gear (332) are arranged so that the reference diameter of the first planetary gear (321) is larger than the reference diameter of the second planetary gear (322), so that the reference diameter of the first sun gear (331) can be formed smaller than the reference diameter of the second sun gear (332). In addition, the sun gear portion (330) is formed with the inner side being circularly recessed, and an inner ring gear (333) is provided on the inner circumference.In addition, the sun gear portion (330) includes a ratchet gear portion (335) formed to be inserted into the sun gear portion (330) and to mesh with the inner gear (333). The ratchet gear portion (335) is formed with a reference diameter corresponding to the inner gear (333) of the sun gear portion (330) so as to mesh with it, but may be formed to have a wider width than the sun gear portion (330). That is, the ratchet gear portion (335) may be formed so that a portion thereof protrudes in the axial direction when inserted into the inside of the sun gear portion (330). In addition, a ratchet member (336) is formed on the outer circumferential surface of the ratchet gear portion (335) so that the state in which it is elastically extended outward is in a neutral state. In addition, since the width of the ratchet gear portion (335) is formed larger than that of the sun gear portion (330), a ratchet pulley (338) integrally formed with the ratchet member (336) is provided on the outer surface of the portion protruding outward from the sun gear portion (330). The ratchet pulley (338) is formed to correspond to the ratchet member (336) and extend in the axial direction, and serves to allow the ratchet member (336) to be folded. In addition, the ratchet member (336) is formed to engage with the gear teeth of the inner ring gear (333) when in a neutral state, and when the outer surface is pressurized, it folds inward, allowing the engagement with the inner ring gear (333) to be released. That is, the ratchet gear portion (335) is provided so that it can rotate together with the sun gear portion (330) when the ratchet member (336) is extended, and so that it is disengaged from the sun gear portion (330) and cannot rotate when the ratchet member (336) is folded inward. At this time, the ratchet member (336) can be folded together when the ratchet pull (338) is pressed and retracted by the first and second shift levers (510, 520) to be described later. In addition, the ratchet gear portion (335) is formed in a hollow shape, and an insertion groove portion (337) is provided that is formed by being recessed in a square shape on the inside.The above fitting groove (337) is fitted with the fitting projection (430) to be described later, and serves to fix the ratchet gear portion (335) to the shaft portion (400). That is, when the ratchet gear portion (335) and the sun gear portion (330) are engaged, the shaft portion (400) rotates together, and when the ratchet gear portion (335) and the sun gear portion (330) are disengaged, the power by the sun gear portion (330) is not transmitted, and thus the shaft portion (400) does not rotate. Accordingly, when the engagement of the ratchet gear portion (335) introduced into the first sun gear (331) is released, the ratchet gear portion (335) introduced into the second sun gear (332) is maintained in an engaged state, and when the engagement of the ratchet gear portion (335) introduced into the second sun gear (332) is released, the ratchet gear portion (335) introduced into the first sun gear (331) is maintained in an engaged state, so that the shaft portion (400) can rotate at different reduction ratios.

[0034] Next, the shaft portion (400) is installed in a form that penetrates the housing portion (100) and is exposed on both sides, and receives power from the power transmission portion (200) and the planetary gear reducer (300) to rotate while keeping the input shaft and the output shaft on the same line. For example, the shaft portion (400) includes a first mounting portion (410) provided for mounting the first sun gear (331), a second mounting portion (420) provided for mounting the second sun gear (332), and a fitting portion (430) that allows the ratchet gear portion (335) to be fitted and fixed to the outer circumference. The first mounting portion (410) and the second mounting portion (420) are provided to be recessed into the inside of the shaft portion (400) and are formed with corresponding widths so that the sun gear portion (330) and the ratchet gear portion (335) can be accommodated therein. In addition, the fitting projection (430) is provided to protrude squarely from one side of the first mounting portion (410) and the second mounting portion (420) and is formed to correspond to the fitting groove portion (337), thereby allowing the ratchet gear portion (335) to be fixed to the shaft portion (400). At this time, the shaft portion (400) can receive power by the rotation of any one of the first sun gear (331) and the second sun gear (332) that is not selectively disengaged.

[0035] Lastly, the above-described shift module (500) functions to pressurize the remaining ratchet gear parts (335) except for one of the plurality of ratchet gear parts (335), so that the shaft part (400) can be rotated only by one of the ratchet gear parts (335). For example, the above-described shift module (500) includes a first shift lever (510) installed to be spaced apart from the first sun gear (331), a second shift lever (520) installed to be spaced apart from the second sun gear (332), and a shift lever moving part (530) that operates the first shift lever (510) and the second shift lever (520). The first shift lever (510) and the second shift lever (520) are formed in a circular ring shape corresponding to the reference diameter of the ratchet gear portion (335), and the inner circumference is formed in a stepped manner and the stepped corners are rounded. That is, when the first shift lever (510) and the second shift lever (520) move toward the ratchet gear portion (335), the ratchet pull (338) is pressed by the stepped portion to fold, so that the ratchet member (336) folds together. As a result, the protruding portion of the ratchet gear portion (335) is inserted into the inside of the first shift lever (510) and the second shift lever (520) together with the ratchet pull (338). Accordingly, when the first gear lever (510) and the second gear lever (520) are moved toward the ratchet gear portion (335), the engagement between the ratchet gear portion (335) and the sun gear portion (330) is released. In addition, the shift lever moving part (530) includes a first shift motor (531) that operates the first shift lever (510) and a second shift motor (532) that operates the second shift lever (520), and the first shift motor (531) and the second shift motor (532) are supported by a support member (533) that is formed by protruding from one side of the ring gear part (310), so that the first shift lever (510) and the second shift lever (520) can be arranged to be spaced apart from the sun gear part (330).Additionally, the gear lever moving part (530) may be provided in the form of a screw thread or a hydraulic cylinder so that the gear lever can be moved in a straight line by a motor.

[0036] In particular, referring to FIG. 9, the first shift motor (531) is operated, and the engagement between the first sun gear (331) and the ratchet gear portion (335) is released by the first shift lever (510) to shift to the first gear, and the second shift motor (532) is operated, and the engagement between the second sun gear (332) and the ratchet gear portion (335) is released by the second shift lever (520) to shift to the second gear. In this embodiment, for the convenience of explanation, the device is described as having a two-stage shift structure as an example, but it is obvious that a multi-stage shift structure of two or more stages can be formed by additionally installing a planetary gear and a shift lever.

[0037] It should be understood that the embodiments described above are illustrative in all respects and not restrictive, and the scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0038] [Explanation of symbols]

[0039] 100: Housing Department

[0040] 110: Front case

[0041] 120: Rear case

[0042] 130: The Central Department

[0043] 140: Reception area

[0044] 150: Bearing

[0045] 200: Power transmission

[0046] 210: Stator

[0047] 211: Power supply

[0048] 220: Rotor

[0049] 221: Binding Hall

[0050] 300: Planetary gear reducer

[0051] 310: Ring Gear

[0052] 311: First ring gear

[0053] 312: Second ring gear

[0054] 320: Meteor Gear Fisherman

[0055] 321: First planetary gear

[0056] 322: Second planetary gear

[0057] 330: The Fisherman of the Sun

[0058] 331: First gear

[0059] 332: Second gear

[0060] 333: Inner gear

[0061] 334: Outer wheel gear

[0062] 335: Ratchet Gear

[0063] 336: Ratchet part

[0064] 337: Insertion groove

[0065] 338: Ratchet pull

[0066] 400: Shaft

[0067] 410: First landing

[0068] 420: Second landing

[0069] 430: Insertion stone

[0070] 500: Transmission module

[0071] 510: First gear lever

[0072] 520: Second gear lever

[0073] 530: Shift lever moving part

[0074] 531: First gear motor

[0075] 532: Second gear motor

[0076] 533: Absence of support

Claims

1. A cylindrical housing part open on both sides; A cylindrical power transmission unit provided inside the housing section and capable of rotating when supplied with power, and provided in a hollow shape; A planetary gear reducer connected to one side of the above power transmission unit and rotating coaxially by receiving power; A shaft portion that penetrates the center of the housing portion and is exposed on both sides and is connected to the planetary gear reducer to transmit power; and A transmission module that allows the connection between the shaft portion and the planetary gear reducer to be selectively made and allows the reduction ratio of the power transmitted to the shaft portion to be changed; A double-axis rotary motor with an integrated gear reducer, characterized in that the above planetary gear reducer is coaxially connected to a power transmission unit so that output is generated on both sides of the shaft unit, and the reduction ratio can be selectively changed by the transmission module.

2. In paragraph 1, The above power transmission unit is, A stator formed in a hollow shape and receiving power; and A dual-axis rotary motor with an integrated gear reducer, characterized in that it includes a rotor which is formed in a cylindrical shape that surrounds the outer side of the stator, is rotated by the stator, and has a coupling hole formed on one surface so that the planetary gear reducer can be coupled.

3. In paragraph 1, The above planetary gear reducer is, A ring gear portion comprising a plurality of ring gears arranged in parallel with the power transmission portion and fixed and forming a concentric axis with the power transmission portion; A planetary gear unit comprising a plurality of planetary gears that are interlocked with each other on the inner surface of the ring gear unit and are arranged radially and rotate around the central axis of the power transmission unit; and A dual-axis rotary motor with an integrated reducer, characterized in that it includes a sun gear section comprising a plurality of sun gears arranged and meshed at the center of the planetary gear section and rotated by the revolution of the planetary gear section.

4. In paragraph 3, The above-mentioned fishing gear is, A plurality of sun gears formed so that an outer gear is formed on the outer surface and an inner gear is formed on the inner surface; and It includes a plurality of ratchet gear portions that are introduced into the inside of the above-mentioned sun gear and mesh with the above-mentioned inner gear, but can be selectively disengaged from the mesh with the inner gear by pressurization; A double-axis rotary motor with an integrated reducer, characterized in that the ratchet gear portion is coupled with the shaft portion to ultimately transmit power generated in the power transmission portion, and when meshed with the inner gear, rotates together to allow the shaft portion to rotate, and when meshed with the inner gear, does not rotate.

5. In paragraph 4, The above gearbox module, A dual-axis rotary motor with an integrated reducer, characterized in that the remaining ratchet gear parts except for one of the plurality of ratchet gear parts are pressurized so that the shaft part can be rotated only by one of the ratchet gear parts.

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