Miniature speed reducer

Abstract

A kind of micro reducer, including shell, input shaft, rear end cover movable element, rear bearing, rear end cover fixed element, first locking element, second locking element and gear set.The shell includes the first end, second end and accommodating space being arranged axially opposite.The rear end cover movable element is embedded in the accommodating space, and is adjacent to the first end.The rear bearing, rear end cover movable element and shell are concentrically nested from inside to outside in radial direction.The rear end cover fixed element is arranged between the first end and motor body, and the rear end cover movable element, rear end cover fixed element and motor body are arranged along the axial direction.The first locking element locks the rear end cover fixed element and motor body along the axial direction, and the second locking element locks the shell and rear end cover fixed element along the radial direction.The gear set is accommodated in the accommodating space and is relative to the input shaft in space, and the gear set is connected concentrically with the motor output shaft along the axial direction through the rear bearing, rear end cover fixed element.

Description

Technical Field

[0001] This invention relates to a speed reducer structure, and more particularly to a miniature speed reducer. By setting up a movable part and a fixed part for the rear end cover, the assembly difficulty is reduced, and the miniature speed reducer and the motor are connected in the axial direction, while achieving the purpose of positioning the rotation phase. Background Technology

[0002] A speed reducer is a mechanical device that changes rotational speed. Among the many types of speed reducers, miniature speed reducers driven by planetary gears are characterized by their small size, light weight, and long service life. Because planetary gear reducers have their output and input shafts on the same axis, when connecting the reducer to a motor, the motor's output shaft and the reducer's input center gear must be connected and assembled axially.

[0003] Because miniature speed reducers have thin ring gear housings, they are often assembled with motors using threaded fastening or side locking. When the speed reducer and motor are secured by axial threads and threads, the phase of rotation between the speed reducer and motor cannot be determined. Furthermore, a tightening structure must be designed when fixing the speed reducer and motor; otherwise, the threads are difficult to tighten, and there is a risk of loosening in the opposite direction, requiring additional adhesive for fixation. Additionally, while side locking allows for rotational direction positioning, it still requires addressing the axial contact of the speed reducer components, making assembly difficult and potentially damaging to parts during the assembly process.

[0004] In view of this, it is necessary to provide a micro reducer that enables convenient axial connection between the micro reducer and the motor, while simultaneously achieving the purpose of positioning the rotation phase, in order to overcome the shortcomings of known technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a micro speed reducer to solve at least one of the above-mentioned problems.

[0006] This invention proposes a miniature speed reducer. Through the combination of a movable rear end cover and a fixed rear end cover, the axial connection between the miniature speed reducer and the motor is facilitated, and the rotational phase of the motor's output shaft is positioned by the miniature speed reducer. The structure of the movable and fixed rear end cover components is simple and retains the original functions. The rear bearing, the movable rear end cover, and the ring gear shell are concentrically fitted radially from the inside out. The movable rear end cover interferes with the ring gear shell, providing support and a rounded effect. Furthermore, for planetary support arms supported by a rear bearing, the movable rear end cover is easy to manufacture and assemble. On the other hand, the movable rear end cover, the fixed rear end cover, and the motor body are arranged axially. The interference of the movable rear end cover with the ring gear shell avoids axial contact problems between speed reducer components. Moreover, the fixed rear end cover and the motor body are locked axially, while the fixed rear end cover and the ring gear shell are locked radially, which helps reduce the difficulty of overall assembly and simultaneously achieves the concentric connection of the miniature speed reducer and the motor in the axial direction and the positioning of the rotational phase.

[0007] To achieve the aforementioned objectives, the present invention provides a miniature speed reducer for connection to a motor output shaft of a motor. The miniature speed reducer includes a housing, an input shaft, a rear end cover movable member, a rear bearing, a rear end cover fixing member, at least one first locking fastener, at least one second locking fastener, and a gear set. The housing includes a first end, a second end, and a receiving space. The first end and the second end are arranged opposite each other along an axial direction, and the receiving space communicates between the first end and the second end. The rear end cover movable member is embedded in the receiving space of the housing. The rear bearing is received in the receiving space, and the rear bearing, the rear end cover movable member, and the housing are concentrically fitted radially from the inside out to support the input shaft. The rear end cover fixing member is disposed between the first end of the housing and the motor body of the motor, arranged axially with the rear end cover movable member and the motor body, and includes a hollow portion arranged axially. The first locking fastener axially locks the rear end cover fixing member and the motor body, and the second locking fastener radially locks the housing and the rear end cover fixing member. The gear set is received in the receiving space and includes a first planetary support arm and at least one first planetary gear. The first planetary support arm includes a first rear support arm and a first front support arm. The first rear support arm connects the rear bearing and the input shaft. The first planetary gear is rotatably mounted and supported between the first rear support arm and the first front support arm. The input shaft is spatially positioned relative to the first planetary gear. The input shaft axially passes through the hollow portion of the first rear support arm, the rear bearing, and the rear end cover fixing member of the first planetary support arm and is concentrically connected to the motor output shaft.

[0008] In one embodiment, the micro reducer has an outer diameter, wherein the outer diameter of the housing, the outer diameter of the rear end cover fixture, or the outer diameter of the motor is less than or equal to the outer diameter of the device.

[0009] In one embodiment, the rear bearing includes an inner ring and an outer ring, with the rear end cover sleeved on the outer ring and the inner ring sleeved on the fitting portion of the first supporting rear arm.

[0010] In one embodiment, the rear cover fastener includes a fitting section that fits from the first end of the housing into the receiving space of the housing, so that the housing covers the fitting section.

[0011] In one embodiment, the housing includes a first positioning hole adjacent to the first end and radially communicating with the accommodating space, and the rear end cover fixing member includes a second positioning hole disposed in the fitting section and radially communicating with the hollow portion, wherein the second locking member radially passes through the first positioning hole and the second positioning hole to lock the housing and the rear end cover fixing member and to position the rotation phase of the motor output shaft.

[0012] In one embodiment, a first planetary support arm supports a first planetary gear, a first support rear arm has a fitting portion, the inner ring of the rear bearing is fitted onto the fitting portion, and the input shaft passes through the hollow portion between the fitting portion and the rear end cover fixing member to assemble and drive the first planetary gear.

[0013] In one embodiment, the input shaft includes an active end and a sun gear ring disposed on the outer peripheral wall of the active end, and the sun gear is spatially relative to the first planetary gear to drive the first planetary gear.

[0014] In one embodiment, the housing further includes a ring tooth, which is disposed around the inner peripheral wall of the housing, spatially relative to the first planetary gear, and in contact with the outer end face of the first planetary gear.

[0015] In one embodiment, the micro reducer further includes a front end cover and a front bearing. The front end cover is disposed at the second end to cover the accommodating space, and the front bearing is disposed axially and through the front end cover at the second end.

[0016] In one embodiment, the micro reducer further includes an output shaft disposed axially in the accommodating space. The output shaft is connected to the input shaft via a gear set and supported at the second end by a front bearing.

[0017] In one embodiment, one end of the output shaft is fixed to the other side of the first planetary gear supported by the first support forearm.

[0018] The beneficial effects of this invention are that it provides a miniature speed reducer, which, through the combination of a movable rear end cover and a fixed rear end cover, makes the axial connection between the miniature speed reducer and the motor easier and allows the miniature speed reducer to position the rotational phase of the motor's output shaft. The structure of the movable rear end cover and the fixed rear end cover is simple and retains the original function. The rear bearing, the movable rear end cover, and the ring tooth thin shell are concentrically fitted from the inside to the outside in the radial direction. The movable rear end cover interferes with the ring tooth thin shell, providing support for the thin shell and a rounding effect. Attached Figure Description

[0019] Figure 1 This is a cutaway view of the micro reducer and the corresponding motor according to the first embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of the micro reducer and motor assembly according to the first embodiment of the present invention.

[0021] Figure 3 This is a perspective view of the micro reducer and motor assembly according to the first embodiment of the present invention.

[0022] Figure 4 For public Figure 3 A cross-sectional view taken along line segment AA.

[0023] Figure 5 For public Figure 3 A cross-sectional view taken along line segment BB.

[0024] Figure 6 This is a perspective view of the rear cover fixing member in the first embodiment of the present invention.

[0025] Figures 7A to 7D This is a schematic diagram illustrating the assembly process of the micro reducer and motor according to the first embodiment of the present invention.

[0026] Figure 8 This is a cross-sectional view of the micro reducer and the corresponding motor according to the second embodiment of the present invention.

[0027] Figure 9 This is a cross-sectional view of the micro reducer and motor assembly according to the second embodiment of the present invention.

[0028] Figure 10 This is a perspective view of the micro reducer and motor assembly according to the second embodiment of the present invention.

[0029] Figure 11 For public Figure 10 A cross-sectional view taken along the CC line segment.

[0030] Figure 12 For public Figure 10 A cross-sectional view taken along the DD line segment.

[0031] The attached figures are labeled as follows:

[0032] 1, 1a: Miniature speed reducer

[0033] 10: Shell

[0034] 11: First end

[0035] 12: Second end

[0036] 13: Storage space

[0037] 14: First positioning hole

[0038] 15: Ring teeth

[0039] 16: Front cover

[0040] 17: Additional positioning components

[0041] 20: Input axis

[0042] 21: Socket end

[0043] 22: Functional end

[0044] 30: Rear end cover movable part

[0045] 40: Rear bearing

[0046] 41: Inner Ring

[0047] 42: Outer Ring Road

[0048] 40a: Front bearing

[0049] 40b: Third bearing

[0050] 50: Rear end cover fastener

[0051] 51: Hollow section

[0052] 52: Overlapping Section

[0053] 53: First locking hole

[0054] 54: Second positioning hole

[0055] 55: Protruding section

[0056] 60: First Locking Fitting

[0057] 70: Second locking device

[0058] 80, 80a: Gear set

[0059] 81: First planetary support arm

[0060] 811: First Support Arm

[0061] 812: First supporting forearm

[0062] 813: Pivot Shaft

[0063] 814: Fitting Part

[0064] 82: First Planetary Gear

[0065] 83: Output shaft

[0066] 84: Second solar tooth

[0067] 85: Second planetary support arm

[0068] 851: Second Support Arm

[0069] 852: Second Support Forearm

[0070] 86: Second Planetary Gear

[0071] 2.2a: Gearbox motor assembly structure

[0072] 9: Motor

[0073] 90: Motor output shaft

[0074] 91: Motor body

[0075] 92: Second locking hole

[0076] 93: Rotor

[0077] 94: Stator

[0078] 95: Flange

[0079] 96: Motor bearing

[0080] 97: Outgoing cable end

[0081] AA, BB, CC, DD: line segments

[0082] J: Axial direction

[0083] OD: Outer diameter of the device Detailed Implementation

[0084] Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can be varied in different ways without departing from its scope, and the descriptions and drawings herein are illustrative in nature and not intended to limit the invention. For example, different embodiments of the present invention may use repeated reference numerals and / or markings. These repetitions are for simplification and clarity and are not intended to limit the relationships between the various embodiments and / or the described appearance structures. Furthermore, when a component is referred to as "connected to" or "coupled to" another component, it may be directly connected to or coupled to the other component, or there may be intervening components. Although the numerical ranges and parameters of the broad scope of the present invention are approximate, the values ​​are stated as precisely as possible in specific examples. Additionally, it is understood that although terms such as "first," "second," and "third" may be used in the claims to describe different components, these components should not be limited by these terms, and the corresponding components described in the embodiments are represented by different component symbols. These terms are used to distinguish different components. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the scope of the embodiments. The term “and / or” as used here includes any or all of the combinations of one or more of the related listed items.

[0085] refer to Figures 1 to 6This invention discloses a miniature speed reducer 1, connected to a motor output shaft 90 of a motor 9 to form a speed reducer-motor assembly structure 2. The motor 9 includes a motor output shaft 90, a motor body 91, a rotor 93, a stator 94, a flange 95, and at least one motor bearing 96. The motor output shaft 90 is connected to the motor body 91 via the motor bearing 96 and is sealed within the motor body 91 by the flange 95. The motor output shaft 90 passes through the flange 95, connects to the rotor 93, and rotates synchronously with the rotor 93 when the rotor 93 interacts with the stator 94. In this embodiment, the miniature speed reducer 1 includes a housing 10, an input shaft 20, a rear end cover movable part 30, a rear bearing 40, a rear end cover fixing part 50, at least one first locking fastener 60, at least one second locking fastener 70, and a gear set 80. The housing 10 is, for example, tubular in shape, including a first end 11, a second end 12, and an accommodating space 13. The first end 11 and the second end 12 are disposed opposite to each other on the housing 10 along an axial direction J, and the accommodating space 13 communicates between the first end 11 and the second end 12. The rear end cover movable member 30 is embedded in the accommodating space 13 of the housing 10, adjacent to the first end 11, and abuts against the side edge of the rear end cover fixing member 50. The rear bearing 40 is accommodated in the accommodating space 13, and the rear bearing 40, the rear end cover movable member 30, and the housing 10 are concentrically fitted together radially from the inside to the outside. The rear end cover fixing member 50 is disposed between the first end 11 of the housing 10 and the motor body 91 of the motor 9. The rear end cover movable member 30, the rear end cover fixing member 50, and the motor body 91 of the motor 9 are arranged along an axial direction J, and the rear end cover fixing member 50 is disposed between the rear end cover movable member 30 and the motor body 91. The rear end cover fixing member 50 includes a hollow portion 51 disposed along the axial direction. The first locking fastener 60 locks the rear end cover fixing member 50 and the motor body 91 of the motor 9 along the axial direction J, and the second locking fastener 70 locks the housing 10 and the rear end cover fixing member 50 along the radial direction. It should be noted that the rear end cover movable member 30 and the rear end cover fixing member 50 are arranged in space to cooperate with each other, providing a function similar to the end cover connecting the reducer and the motor in the prior art. However, the two-piece design disclosed in this invention can achieve other effects, which will be described in detail later. The gear set 80 is housed in the accommodating space 13 and includes a first planetary support arm 81 and a first planetary gear 82. The first planetary support arm 81 includes a first supporting rear arm 811 and a first supporting front arm 812. The first supporting rear arm 811 is connected between the rear bearing 40 and the input shaft 20. The first planetary gear 82 is rotatably arranged and supported between the first supporting rear arm 811 and the first supporting front arm 812 along the axial direction J. The input shaft 20 is spatially arranged relative to the first planetary gear 82. One end of the input shaft 20 passes through the first support rear arm 811, the rear bearing 40, and the hollow part 51 of the rear end cover fixing member 50 along the axial direction J and is concentrically connected to the motor output shaft 90.

[0086] It is worth noting that, in this embodiment, the assembly of the micro reducer 1 and the motor 9 is further achieved through the combination of the rear end cover movable part 30 and the rear end cover fixed part 50, which makes the axial connection of the micro reducer 1 and the motor 9 easier and allows the rotation phase of the motor output shaft 90 to be positioned during the assembly of the micro reducer 1 and the motor 9. The structure of the rear end cover movable part 30 and the rear end cover fixed part 50 is simple and retains the original function of the rear end cover. The rear bearing 40, the rear end cover movable part 30, and the housing 10 are concentrically fitted from the inside to the outside in the radial direction, and the rear end cover movable part 30 is connected to the inner peripheral wall of the housing 10 through interference. Therefore, the rear end cover movable part 30 also provides the effect of supporting the housing 10 and maintaining the roundness of the housing 10. For the first planetary support arm 81 supported by the rear bearing 40, the annular rear end cover movable part 30 is easy to process and convenient to cooperate and assemble with the first planetary support arm 81. On the other hand, in this embodiment, the thickness of the rear end cover movable part 30 in the axial direction J is approximately equal to that of the rear bearing 40. The rear end cover movable part 30, the rear end cover fixed part 50, and the motor body 91 of the motor 9 are arranged along the axial direction J. They are connected to the inner peripheral wall of the housing 10 by interference of the rear end cover movable part 30, avoiding assembly contact problems that may occur between the rear bearing 40 and the gear set 80 in the axial direction J. Furthermore, by using the first locking fastener 60 and the second locking fastener 70, the motor body 91, the rear end cover fixed part 50, and the housing 10 are respectively locked and fixed in the axial direction and radial direction, completing the assembly and fixing of the micro reducer 1 and the motor 9. The rear end cover fixed part 50 and the motor body 91 of the motor 9 are locked and fixed along the axial direction J by the first locking fastener 60, while the rear end cover fixed part 50 and the housing 10 are locked and fixed radially by the second locking fastener 70. This helps to reduce the difficulty of overall assembly and simultaneously achieves the concentric connection of the micro reducer 1 and the motor 9 in the axial direction J and the positioning of the rotation phase.

[0087] In this embodiment, the rear end cover fixing member 50 includes a fitting section 52 and a protruding section 55. The fitting section 52 fits from the first end 11 of the housing 10 into the receiving space 13 of the housing 10, so that the housing 10 covers the fitting section 52. The protruding section 55 connects to the fitting section 52. During the assembly process, when the housing 10 covers the fitting section 52, the protruding section 55 connects to the first end 11 of the housing 10, forming a flat extended annular surface with the housing 10. Of course, the present invention is not limited to this. In this embodiment, the rear end cover fixing member 50 includes at least one first locking hole 53, which penetrates the rear end cover fixing member 50 along the axial direction J. In this embodiment, for example, three first locking holes 53 penetrate the rear end cover fixing member 50 along the axial direction J and are equidistantly arranged around the hollow portion 51. The three first locking holes 53 spatially correspond to the three second locking holes 92 on the flange 95 of the motor 9. Three first locking fasteners 60 respectively pass through three corresponding first locking holes 50 and three second locking holes 92, enabling the rear end cover fixing member 50 to mate with the flange 95 of the motor 9, and the motor output shaft 90 passes through the hollow portion 51 of the rear end cover fixing member 50. In this embodiment, the housing 10 includes a first positioning hole 14 adjacent to the first end 11 and radially communicating with the accommodating space 13. The rear end cover fixing member 50 includes a second positioning hole 54 disposed in the fitting section 52 and radially communicating with the hollow portion 51. The second locking fastener 70 radially passes through the first positioning hole 14 and the second positioning hole 54 to lock the housing 10 and the rear end cover fixing member 50 and to position the rotational phase of the motor output shaft 90. It should be noted that in other embodiments, the number of first locking holes 53, second locking holes 92, first locking fasteners 60, first positioning holes 14, second positioning holes 54, and second locking fasteners 70 can be adjusted according to actual application requirements, and the present invention is not limited thereto.

[0088] In this embodiment, the input shaft 20 includes a sleeve end 21 and an operating end 22 opposite to each other, wherein the sleeve end 21 is concentrically connected to the motor output shaft 50. The input shaft 20 also includes a sun gear, which is arranged around the outer peripheral wall of the operating end 22 and is spatially opposite to the first planetary gear 82, wherein the sun gear is in contact with the inner end face of the first planetary gear 82, and drives the first planetary gear 82 when the motor output shaft 90 drives the input shaft 20 to rotate. In this embodiment, the housing 10 also includes a ring gear 15, which is arranged around the inner peripheral wall of the housing 10 and is spatially arranged opposite to the first planetary gear 82, wherein the ring gear 15 is in contact with the outer end face of the first planetary gear 82. The micro reducer 1 also includes a front end cover 16, which can be separately provided or integrally formed on the side edge of the second end 12 of the housing 10 to cover the accommodating space 13 from the second end 12 along the axial direction J. The micro reducer 1 also includes a front bearing 40a, which is arranged along the axial direction J and is provided on the second end 12 of the housing 10 through the front end cover 16. In this embodiment, the micro reducer 1 further includes an output shaft 83, which is axially disposed in the accommodating space 13. The output shaft 83 is connected to the input shaft 20 via a gear set 80 and is supported by a front bearing 40a and disposed at the second end 12 of the housing 10. One end of the output shaft 83 is fixed to the other side of the first supporting front arm 812 supporting the first planetary gear 82. Thus, when the motor output shaft 90 of the motor 9 drives the input shaft 20 to rotate, the outer end face of the first planetary gear 82 remains in contact with the ring gear 15 of the housing 10, and the inner end face of the first planetary gear 82 remains in contact with the sun gear of the working end 22 of the input shaft 20, so that the first planetary gear 82 rotates around the input shaft 20.

[0089] In this embodiment, the micro reducer 1 has an outer diameter OD. The outer diameter of the housing 10, the outer diameter of the rear end cover fixing member 50, or the outer diameter of the motor 9 are all less than or equal to the outer diameter OD. In this embodiment, the outer diameter of the housing 10, the outer diameter of the rear end cover fixing member 50, or the outer diameter of the motor 9 are all, for example, smaller than the outer diameter OD of the micro reducer 1, thus ensuring that the micro reducer 1 has a small volume after assembly. In this embodiment, when the micro reducer 1 and the motor 9 are assembled to form the reducer-motor assembly structure 2, the first end 11 of the housing 10 is connected to the flange 95 and the motor body 91 of the motor 9 through the protruding section 55 of the rear end cover fixing member 50, forming a flat cylindrical structure to facilitate further assembly and application of the reducer-motor assembly structure 2. Of course, the appearance of the reducer-motor assembly structure 2 of the present invention is not limited to this.

[0090] Figures 7A to 7D Furthermore, the assembly of the miniature reducer 1 and the motor 9 to form a reducer-motor assembly structure 2 is disclosed. Firstly, as... Figure 7AAs shown, the front bearing 40a, output shaft 83, first supporting front arm 812, first planetary gear 82, first supporting rear arm 811, and rear bearing 40 of the micro reducer 1 are sequentially placed into the receiving space 13 of the housing 10. An interference connection is formed by the rear end cover movable part 30 tightly fitting against the inner peripheral wall of the housing 10, thus fixing the internal parts of the micro reducer 1 within the housing 10. In this embodiment, three first planetary gears 82 are respectively disposed between the first supporting rear arm 811 and the first supporting front arm 812 via pivot shafts 813, so that each first planetary gear 82 is rotatably disposed and supported between the first supporting rear arm 811 and the first supporting front arm 812 along the axial direction J, and the outer end face of each planetary gear 82 abuts against the ring gear 15 of the housing 10. In other embodiments, the number of first planetary gears 82 can be adjusted according to actual application requirements, and the present invention is not limited thereto. In this embodiment, the rear bearing 40 includes an inner ring 41 and an outer ring 42. The rear end cover movable member 30 (loosely fitted) is sleeved on the outer ring 42, and the inner ring 41 (tightly fitted) is sleeved on a fitting portion 814 of the first supporting rear arm 811. The rear end cover movable member 30 avoids the risk of the rear bearing 40 and gear set 80 coming into contact with the rear end cover fixing member 50 or the housing 10 during subsequent assembly processes. Additionally, as... Figure 7B As shown, the sleeve end 21 of the input shaft 20 is concentrically connected to the motor output shaft 90 via, for example, a heat-fitting method. The protruding section 55 of the rear end cover fixing member 50 connects to the flange 95 of the motor 9. Three first locking holes 53 align with three second locking holes 92 on the flange 95. Three first locking fasteners 60 pass through the three first locking holes 50 and the three second locking holes 92 respectively, causing the rear end cover fixing member 50 to mate with the flange 95 of the motor 9. The input shaft 20, concentrically connected to the motor output shaft 90, further penetrates the hollow portion 51 of the rear end cover fixing member 50, exposing the sun tooth on the working end 22 of the input shaft 20. Then, as... Figure 7C As shown, the sun gear on the working end 22 of the input shaft 20 is aligned with the inner end face of the first planetary gear 82 via the rear bearing 40 and the first supporting rear arm 811. The fitting section 52 of the rear end cover fixing member 50 is inserted into the accommodating space 13 from the first end 11 of the housing 10 and connected to the rear end cover movable member 30. After the housing 10 covers the fitting section 52 of the rear end cover fixing member 50, the three first positioning holes 14 of the housing 10 can be respectively aligned with the three second positioning holes 54 on the fitting section 52 of the rear end cover fixing member 50, as shown. Figure 7D As shown. At this time, the three second locking fasteners 70 can lock the housing 10 and the rear end cover fastener 50 radially through the first positioning hole 14 and the second positioning hole 54, and position the rotation phase of the motor output shaft 90.

[0091] In this embodiment, the micro reducer 1 further includes an additional positioning element 17, such as a wiring hole, which is disposed at the second end 12 or the front end cover 16 of the housing 10 and aligned with the second locking fastener 70 passing through the first positioning hole 14 and the second positioning hole 54. Since the additional positioning element 17 and the first positioning hole 14 are both disposed on the housing 10, and the first positioning hole 14 is connected to the corresponding second positioning hole 54, when the second locking fastener 70 radially passes through the first positioning hole 14 and the second positioning hole 54 to lock the motor 9 connected to the rear end cover fixing member 50, the rotational phase of the additional positioning element 17 and the motor output shaft 90 can be positioned. In this embodiment, the motor 9 also includes a lead-out terminal 97. When the second locking fastener 70 secures the motor 9, which is connected to the rear end cover fixing member 50, through the first positioning hole 14 and the second positioning hole 54 radially, the lead-out terminal 97 of the motor 9 can be aligned with the additional positioning member 17 on the micro reducer 1. Then, a ground wire (not shown) of the motor 9 is led out from the lead-out terminal 97 and electrically connected to the additional positioning member 17 to form a grounded connection and position the rotation phase of the motor output shaft, thus establishing the shortest distance connection. Of course, the present invention is not limited to this.

[0092] Figures 8 to 12 This invention discloses a micro speed reducer according to a second embodiment. In this embodiment, the micro speed reducer 1a, the speed reducer-motor assembly structure 2a, and the motor 9 are... Figures 1 to 5The miniature reducer 1, reducer motor assembly structure 2, and motor 9 shown are similar, and the same component designations represent the same components, structures, and functions, which will not be described again here. In this embodiment, to achieve a higher reduction ratio, the miniature reducer 1a has a two-stage reduction design for the gear set 80a, including a first planetary support arm 81, at least one first planetary gear 82, a second sun gear 84, a second planetary support arm 85, and at least one second planetary gear 86, arranged along the axial direction J. The first planetary gear 82 is rotatably arranged and supported between the first support rear arm 811 and the first support front arm 812 along the axial direction J. The second planetary support arm 85 includes a second rear support arm 851 and a second front support arm 852. The second planetary gear 86 is rotatably disposed and supported between the second rear support arm 851 and the second front support arm 852 along the axial direction J. The second sun gear 84 is spatially relative to the second planetary gear 86. One end of the second sun gear 84 passes through the second rear support arm 851 and is fixed to the other side of the first front support arm 812 supporting the first planetary gear 82. The other end of the second sun gear 84 is connected to the second front support arm 852 through a third bearing 40b. The second sun gear 84 and the second planetary gear 86 are mated. One end of the output shaft 83 is fixed to the other side of the second front support arm 852 supporting the second planetary gear 86. During assembly, the front bearing 40a, output shaft 83, second support front arm 852, third bearing 40b, second planetary gear 86, second support rear arm 851, second sun gear 84, first support front arm 812, first planetary gear 82, first support rear arm 811, and rear bearing 40 of the micro reducer 1a are sequentially placed into the receiving space 13 of the housing 10. An interference connection is formed by the rear end cover movable part 30 tightly fitting against the inner peripheral wall of the housing 10, thus fixing the internal parts of the micro reducer 1a within the housing 10. The rear end cover movable part 30 further avoids the risk of the rear bearing 40 and gear set 80a coming into contact with the rear end cover fixed part 50 during subsequent assembly processes. Subsequently, the rear end cover fixing member 50 and the motor body 91 of the motor 9 are locked and fixed along the axial direction J by the first locking fastener 60, while the rear end cover fixing member 50 and the housing 10 are locked and fixed radially by the second locking fastener 70. This completes the reducer motor assembly structure 2a, and simultaneously achieves the concentric connection of the micro reducer 1a and the motor 9 along the axial direction J and the positioning of the rotation phase. In other embodiments, the gear set 80a is more of a multi-stage reduction design, but this does not affect the operation of the micro reducer 1a connecting to the motor 9 through the rear end cover movable member 30 and the rear end cover fixing member 50. The present invention is not limited thereto, and will not be described in detail further.

[0093] In summary, this invention provides a miniature speed reducer. The combination of the rear end cover movable component and the rear end cover fixed component facilitates axial connection between the miniature speed reducer and the motor, and also allows the miniature speed reducer to position the rotational phase of the motor's output shaft. The structure of the rear end cover movable component and the rear end cover fixed component is simple and retains its original function. The rear bearing, the rear end cover movable component, and the ring gear shell are concentrically fitted radially from the inside out. The rear end cover movable component interferes with the ring gear shell, providing support for the shell and achieving a rounded effect. Furthermore, for planetary support arms supported by the rear bearing, the rear end cover movable component is easy to manufacture and convenient to assemble. On the other hand, the rear end cover movable component, the rear end cover fixed component, and the motor body are arranged axially. The interference of the rear end cover movable component with the ring gear shell avoids axial contact problems between speed reducer components. Moreover, the rear end cover fixed component and the motor body are locked axially, while the rear end cover fixed component and the ring gear shell are locked radially, which helps reduce the difficulty of overall assembly and simultaneously achieves axial concentric connection and rotational phase positioning between the miniature speed reducer and the motor.

[0094] This invention may be modified in various ways by those skilled in the art, but all such modifications shall not depart from the protection sought by the appended claims.

Claims

1. A miniature speed reducer for connection to a motor output shaft of a motor, comprising: A housing includes a first end, a second end, and a receiving space, wherein the first end and the second end are disposed opposite to each other along an axial direction, and the receiving space communicates between the first end and the second end. One input axis; A rear end cap movable component is embedded in the accommodating space; A rear bearing is housed in the accommodating space and is concentrically fitted with the input shaft, the rear end cover movable member, and the housing in a radial direction from the inside to the outside near the first end to support the input shaft; A rear end cover fixing member is disposed between the first end and a motor body of the motor, and is arranged along the axial direction with the rear end cover movable member and the motor body, and includes a hollow portion disposed along the axial direction; At least one first locking fastener secures the rear end cover fastener to the motor body along the axial direction; At least one second locking fastener secures the housing to the rear end cover fastener along the radial direction; and A gear set is housed in the accommodating space and includes a first planetary support arm and at least one first planetary gear, wherein the first planetary support arm includes a first rear support arm and a first front support arm, the first rear support arm is connected between the rear bearing and the input shaft, the first planetary gear is rotatably disposed and supported between the first rear support arm and the first front support arm along the axial direction, and the input shaft is spatially configured relative to the first planetary gear; The input shaft passes through the first support arm, the rear bearing, and the hollow part along the axial direction, and is concentrically connected to the motor output shaft. The rear cover fastener includes a fitting section that fits into the accommodating space from the first end. The housing includes a first positioning hole adjacent to the first end and communicating radially to the accommodating space. The rear cover fastener includes a second positioning hole disposed in the fitting section and communicating radially to the hollow portion. The second locking fastener passes through the first positioning hole and the second positioning hole radially to lock the housing and the rear cover fastener, and positions the rotation phase of the motor output shaft.

2. The micro reducer as claimed in claim 1, wherein the micro reducer has a device outer diameter, wherein a housing outer diameter, a rear end cover fixing member outer diameter, or a motor outer diameter is less than or equal to the device outer diameter.

3. The micro reducer as claimed in claim 1, wherein the rear bearing includes an inner ring and an outer ring, the rear end cover movable part is sleeved on the outer ring, and the inner ring is sleeved on a fitting portion of the first supporting rear arm.

4. The micro reducer as claimed in claim 1, wherein the first planetary support arm supports the first planetary gear, the first rear support arm has a fitting portion, the rear bearing is disposed on the fitting portion, and the input shaft passes through the fitting portion and the hollow portion to assemble and drive the first planetary gear.

5. The micro reducer as claimed in claim 1, wherein the input shaft includes an active end and a sun gear ring disposed on the outer peripheral wall of the active end, and the sun gear is spatially relative to the first planetary gear to drive the first planetary gear.

6. The micro reducer as claimed in claim 1, wherein the housing further includes a ring tooth disposed around the inner peripheral wall of the housing and engaging with the outer end face of the first planetary gear.

7. The micro reducer as claimed in claim 1 further includes a front end cover and a front bearing, the front end cover being disposed at the second end to cover the accommodating space, and the front bearing being disposed along the axial direction and disposed at the second end through the front end cover.

8. The micro reducer as claimed in claim 7 further includes an output shaft disposed along the axial direction in the accommodating space, connected to the input shaft via the gear set, and supported at the second end via the front bearing.

9. The micro reducer as claimed in claim 8, wherein one end of the output shaft is fixed to the other side of the first support arm supporting the first planetary gear.

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