Transmission mechanism and cycloidal speed reducer comprising same

Abstract

Disclosed is a transmission mechanism, comprising: an eccentric shaft portion (101), wherein the eccentric shaft portion (101) is provided with a boss (102), a first cycloidal gear (103) is mounted on the boss (102), a pin gear (104) is mounted on an outer ring of the first cycloidal gear (103), and a first bearing (105) is provided between the boss (102) and the first cycloidal gear (103); a bushing portion (106), wherein the eccentric shaft portion (101) and the bushing portion (106) are of an integrated structure, and there is a spacing between the axis of the eccentric shaft portion (101) and the axis of the bushing portion (106); and a second cycloidal gear (107), wherein the second cycloidal gear (107) is sleeved on the eccentric shaft portion (101), a second bearing (108) is provided between the second cycloidal gear (107) and the eccentric shaft portion (101), a gear is provided on an outer ring of the second cycloidal gear (107), and the second cycloidal gear (107) meshes with an inner ring of the first cycloidal gear (103). An inner ring of the first bearing (105) is fixed to the eccentric shaft portion (101), and an outer ring of the first bearing (105) is fixed to the inner ring of the first cycloidal gear (103); and neither an inner ring nor an outer ring of the second bearing (108) is fixed to the eccentric shaft portion (101) and the second cycloidal gear (107). Further disclosed is a cycloidal speed reducer comprising the transmission mechanism.

Description

Transmission mechanism and cycloid reducer

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on July 19, 2023, with application number 2023108878761 and invention name "Transmission mechanism and cycloid reducer thereof", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of cycloid reducers, and in particular to a transmission mechanism and a cycloid reducer thereof. Background Art

[0004] In traditional technology, the cycloid reducer mainly consists of four parts: a double eccentric shaft, a double cycloid wheel, a pin, and an output shaft. The double eccentric shaft is used as input, and the speed ratio is generated by the cycloid wheel and the pin wheel having one less tooth, and the output is output by the output shaft. On the other hand, traditional technology uses the principle of one less tooth difference, which usually produces a larger reduction ratio and is suitable for scenarios with low output speed and large output torque. Secondly, the use of a double eccentric shaft as input, a double cycloid wheel to balance the rotational inertia and control the backlash, and an output shaft as output leads to a complex overall structure and a long axial length.

[0005] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0006] Application Contents

[0007] In order to meet the above requirements, the purpose of this application is to provide a transmission mechanism and a cycloid reducer thereof.

[0008] In order to achieve the above objectives, this application adopts the following technical solutions:

[0009] A transmission mechanism, comprising:

[0010] An eccentric shaft portion, wherein the eccentric shaft portion is provided with a boss, a first cycloid wheel is mounted on the boss, a pin gear is mounted on the outer ring of the first cycloid wheel; a first bearing is provided between the boss and the first cycloid wheel;

[0011] The eccentric shaft portion and the shaft sleeve portion are an integral structure, and there is a distance between the axis of the eccentric shaft portion and the axis of the shaft sleeve portion;

[0012] The second cycloid wheel is sleeved on the eccentric shaft portion, and a second bearing is provided between the second cycloid wheel and the eccentric shaft portion; the outer ring of the second cycloid wheel is provided with a gear, and the second cycloid wheel is meshed and connected with the inner ring of the first cycloid wheel.

[0013] In one embodiment, the inner ring of the first bearing is fixed to the eccentric shaft portion.

[0014] In one embodiment, the outer ring of the first bearing is fixed to the inner ring of the first cycloid wheel.

[0015] In one embodiment, the inner ring and the outer ring of the second bearing are not fixed to the eccentric shaft portion and the second cycloid gear.

[0016] In one embodiment, the portion where the eccentric shaft portion is connected to the second cycloid gear is located inside the pin gear.

[0017] On the other hand, the present application proposes a cycloid reducer, comprising the transmission mechanism, housing, and motor described in any one of the above items.

[0018] In one embodiment, an input port and an output port are respectively provided at two ends of the housing.

[0019] In one embodiment, the motor is mounted on the input port of the housing, the motor shaft is mounted on the shaft sleeve, and the second cycloid wheel is mounted on the output port.

[0020] In one embodiment, the second cycloid gear sleeve is provided with a third bearing, and the outer ring of the third bearing is in contact with the housing.

[0021] In one embodiment, a gasket is provided between the third bearing and the first cycloid gear.

[0022] The present application will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a transmission mechanism according to one or more embodiments;

[0024] FIG2 is a bottom view of the mechanism of FIG1;

[0025] FIG3 is a cross-sectional schematic diagram of the mechanism of FIG2;

[0026] FIG4 is a schematic structural diagram of a cycloid reducer according to one or more embodiments;

[0027] FIG5 is a cross-sectional schematic diagram of the cycloid reducer of FIG4 .

[0028] Reference Signs 101 eccentric shaft portion 102 boss 103 first cycloid gear 104 pin gear 105 first bearing 106 sleeve portion 107 second cycloid gear 108 second bearing 109 third bearing 201 housing 202 motor 203 gasket DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0032] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0033] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this specification, if the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0035] As shown in Figures 1-3, the present application discloses a transmission mechanism, including an eccentric shaft portion 101, the eccentric shaft portion 101 is provided with a boss 102, the boss 102 is installed with a first cycloidal wheel 103, and the outer ring of the first cycloidal wheel 103 is installed with a needle gear 104; a first bearing 105 is provided between the boss 102 and the first cycloidal wheel 103; a sleeve portion 106, the eccentric shaft portion 101 and the sleeve portion 106 are an integrated structure, and there is a distance between the axis of the eccentric shaft portion 101 and the axis of the sleeve portion 106; a second cycloidal wheel 107, the second cycloidal wheel 107 is sleeved on the eccentric shaft portion 101, and a second bearing 108 is provided between the second cycloidal wheel 107 and the eccentric shaft portion 101; the outer ring of the second cycloidal wheel 107 is provided with a gear, and the second cycloidal wheel 107 is meshed and connected with the inner ring of the first cycloidal wheel 103.

[0036] In one embodiment, the inner ring of the first bearing 108 is fixed to the eccentric shaft portion 101, and the outer ring is fixed to the inner ring of the first cycloidal wheel 103. The inner ring and the outer ring of the second bearing 108 are not fixed to the eccentric shaft portion 101 and the second cycloidal wheel 107, and only play a supporting role. The part where the eccentric shaft portion 101 is connected to the second cycloidal wheel 107 is located inside the pin gear 104, thereby reducing the overall size of the mechanism.

[0037] As shown in Figures 4-5, the present application proposes a cycloid reducer, including the above-mentioned transmission mechanism, a housing 201, and a motor 202. The two ends of the housing 201 are respectively provided with an input port and an output port. The motor 202 is installed at the input port of the housing 201, the motor shaft is installed on the shaft sleeve 106, and the second cycloid wheel 107 is installed at the output port. The second cycloid wheel 107 is provided with a third bearing 109. The outer ring of the third bearing 109 is in contact with the housing 201. A gasket 203 is provided between the third bearing 109 and the second cycloid wheel 107. The gasket 203 also covers a part of the pin gear 104. The gasket 203 can prevent the third bearing 109 from being interfered with by the rotation of the first cycloid wheel 103, thereby avoiding noise.

[0038] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of this application. Industrial Applicability

[0039] In summary, the transmission mechanism and cycloid reducer thereof provided in this application achieve the effect of reducing the overall size of the mechanism.

Claims

1. A transmission mechanism, characterized in that: include: An eccentric shaft portion, wherein the eccentric shaft portion is provided with a boss, a first cycloidal wheel is mounted on the boss, a pin gear is mounted on the outer ring of the first cycloidal wheel; a first bearing is provided between the boss and the first cycloidal wheel; A shaft sleeve portion, wherein the eccentric shaft portion and the shaft sleeve portion are an integrated structure, and there is a distance between the axis of the eccentric shaft portion and the axis of the shaft sleeve portion; A second cycloidal wheel, wherein the second cycloidal wheel is sleeved on the eccentric shaft portion, a second bearing is provided between the second cycloidal wheel and the eccentric shaft portion; a gear is provided on the outer ring of the second cycloidal wheel, and the second cycloidal wheel is meshedly connected with the inner ring of the first cycloidal wheel.

2. The transmission mechanism according to claim 1, characterized in that: The inner ring of the first bearing is fixed to the eccentric shaft portion.

3. The transmission mechanism according to claim 2, characterized in that: The outer ring of the first bearing is fixed to the inner ring of the first cycloid wheel.

4. The transmission mechanism according to any one of claims 1 to 3, characterized in that: The inner ring and the outer ring of the second bearing are not fixed to the eccentric shaft portion and the second cycloid wheel.

5. The transmission mechanism according to any one of claims 1 to 4, characterized in that: The portion where the eccentric shaft portion is connected to the second cycloid wheel is both located inside the pin gear.

6. A cycloid reducer, characterized in that: It comprises a housing, a motor, and the transmission mechanism according to any one of claims 1 to 5.

7. The cycloid reducer according to claim 6, characterized in that: An input port and an output port are respectively arranged at two ends of the shell.

8. The cycloid reducer according to claim 7, characterized in that: The motor is installed at the input port of the housing, and the motor shaft is installed at the shaft sleeve; the second cycloid wheel is installed at the output port.

9. The cycloid reducer according to any one of claims 6 to 8, characterized in that: The second cycloid wheel sleeve is provided with a third bearing, and the outer ring of the third bearing is in contact with the housing.

10. The cycloid reducer according to claim 9, characterized in that: A gasket is provided between the third bearing and the first cycloid wheel.

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