Coaxial double-speed-ratio output gear box

Abstract

The embodiment of the utility model discloses a coaxial double-speed-ratio output gearbox, which relates to the technical field of mechanical planet wheel transmission, and comprises a driving mechanism, a first inner gear ring, a second inner gear ring and a transmission mechanism, the transmission mechanism comprises a planet carrier, a sun gear and planet gears, the planet gears are arranged on the planet carrier, the planet gears surround the sun gear, the planet gears are meshed with the first inner gear ring, and the planet gears are meshed with the second inner gear ring; the driving mechanism is connected with the sun gear; wherein the planet carrier outputs a first torque, and the second inner gear ring outputs a second torque. The structure is compact, the size is small, small tooth difference transmission has the self-locking characteristic, a clutch can be omitted, reverse input can be achieved through planetary gear transmission, and the application range is wider. According to the design, through combination of small tooth difference transmission and planetary gear transmission, high-efficiency and high-torque output is achieved, and the planetary gear transmission device is suitable for various industrial and civil application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical planetary gear transmission, in particular to a coaxial dual-speed ratio output gear box. Background Art

[0002] Gear reducers are widely used in automobiles, industrial machinery, ships and other fields to accurately control torque and speed. Most traditional gear reducers only provide one output, and the size and length of the gearbox are limited, which has limitations.

[0003] In actual application scenarios, it is often necessary to switch between multiple transmission ratios. The gearboxes with switchable transmission ratios on the market are large in size, which leads to the product occupying a large space. The application of gearboxes is restricted by the volume and space. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the utility model is that the conventional gearbox with switchable transmission ratio is large in size and cannot be widely used.

[0005] In order to solve the above problems, the embodiment of the utility model discloses a coaxial dual-speed ratio output gearbox, which achieves the technical effect of compact structure, small volume and wider application range.

[0006] The utility model provides a coaxial double-speed ratio output gearbox, which comprises a driving mechanism, a first inner gear ring, a second inner gear ring and a transmission mechanism; the transmission mechanism comprises a planet carrier, a sun gear and planetary wheels, the planetary wheels are arranged on the planet carrier, the planetary wheels surround the sun gear, the planetary wheels are meshed with the first inner gear ring, and the planetary wheels are meshed with the second inner gear ring; the driving mechanism is connected to the sun gear; wherein the planet carrier outputs a first torque, and the second inner gear ring outputs a second torque.

[0007] A further technical solution is that it also includes a base, and the first inner gear ring and the driving mechanism are respectively arranged on the base.

[0008] A further technical solution is that it also includes a first bearing, which is connected to the base and the second inner gear ring respectively.

[0009] A further technical solution is that it also includes an output shaft, an output cover and a second bearing, wherein the output shaft is fixed on the planet carrier and connected to the output cover via the second bearing, and the second bearing is press-fitted into the output cover.

[0010] A further technical solution is that it also includes a limit shaft retaining ring, and the limit shaft retaining ring is sleeved on the output shaft.

[0011] A further technical solution is that the output cover is provided with a plurality of evenly distributed connection holes.

[0012] A further technical solution is that the driving mechanism includes a stator assembly, a rotor assembly and a motor shaft, the motor shaft is connected to the sun gear and the rotor assembly respectively, and the stator assembly surrounds the motor shaft.

[0013] A further technical solution is that it also includes a third bearing, which is press-fitted on the motor shaft and between the rotor assembly and the sun gear.

[0014] A further technical solution is that the base is provided with a plurality of ribs, and the plurality of ribs surround the second inner gear ring.

[0015] A further technical solution is that the number of teeth of the first inner gear ring is greater than the number of teeth of the second inner gear ring.

[0016] Compared with the prior art, the technical effects achieved by the embodiments of the present invention include:

[0017] Two different transmission ratios are output in the same gearbox to meet the needs of switching transmission ratios. When the operation requires a small transmission ratio, the first torque output is used; when the operation requires a large transmission ratio, the second torque output is used; wherein, the first torque output: the operation of the driving mechanism drives the sun gear to rotate, the sun gear meshes with the planetary gear, the first inner gear ring is fixed, and then drives the planetary carrier on the planetary gear to rotate, and outputs a small transmission ratio through the output shaft on the planetary carrier; the second torque output: the rotation of the driving mechanism drives the sun gear to rotate, the sun gear meshes with the planetary gear, the planetary gear meshes with the second inner gear ring, drives the second inner gear ring to rotate, the second inner gear ring and the first inner gear ring and the planetary gear form a small tooth difference transmission, and outputs a large transmission ratio through the second inner gear ring. The first output connection mode and the second output connection mode share the sun gear and the planetary gear, and realize the output of two transmission ratios with a smaller structural size. The coaxial dual output design improves the adaptability and flexibility of the motor, has a compact structure, reduces weight, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of a coaxial dual-speed ratio output gearbox structure provided by an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of another coaxial dual-speed ratio output gearbox structure provided by an embodiment of the utility model;

[0021] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0022] Figure 4 A schematic diagram of a gearbox structure with coaxial dual-speed ratio output provided by an embodiment of the utility model;

[0023] Figure 5 A schematic diagram of a gearbox structure with coaxial dual-speed ratio output provided by an embodiment of the utility model;

[0024] Figure 6 A schematic diagram of a gearbox structure with coaxial dual-speed ratio output provided by an embodiment of the utility model;

[0025] Figure 7 A schematic diagram of a gearbox structure with coaxial dual-speed ratio output provided in an embodiment of the utility model.

[0026] Reference numerals

[0027] Driving mechanism 1, first inner gear ring 2, second inner gear ring 3, transmission mechanism 4, sun gear 41, planetary gear 42, planetary carrier 43, output cover 21, base 5, first bearing 6, output shaft 44, limiting shaft retaining ring 71, second bearing 72, limiting part 441, connecting hole 212, stator assembly 11, rotor assembly 12, motor shaft 13, third bearing 73, rib 51, upper shell 52, outer cover 53. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments to be described below are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0030] It should also be understood that the terms used in this utility model embodiment specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model embodiments. As used in the utility model embodiment specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] See also Figure 1-7 The embodiment of the utility model provides a coaxial dual-speed ratio output gearbox. The coaxial dual-speed ratio output gearbox includes a drive mechanism 1, a first inner gear ring 2, a second inner gear ring 3 and a transmission mechanism 4; the transmission mechanism 4 includes a planet carrier 43, a sun gear 41 and a planetary gear 42, the planetary gear 42 is arranged on the planet carrier 43, the planetary gear 42 surrounds the sun gear 41, the planetary gear 42 is meshed with the first inner gear ring 2, and the planetary gear 42 is meshed with the second inner gear ring 3; the drive mechanism 1 is connected to the sun gear 41; wherein the planet carrier 43 outputs a first torque, and the second inner gear ring 3 outputs a second torque. The specific introduction of each component is as follows:

[0032] In this embodiment, the driving mechanism 1 is used to drive the sun gear 41 to rotate. There are multiple planetary gears 42, which surround the sun gear 41 respectively. For example, it includes three planetary gears 42, which are respectively meshed with the sun gear 41 and also respectively meshed with the first inner gear ring 2 and the second inner gear ring 3. The first inner gear ring 2 is a stationary inner gear ring, and the second inner gear ring 3 is a dynamic inner gear ring. The first inner gear ring 2 is below the second inner gear ring 3. Meshing refers to a transmission relationship between two mechanical parts. The central axis of the planetary gear 42 is connected to the planet carrier 43. The first inner gear ring 2 is fixed, the sun gear 41 is active, and the planet carrier 43 is driven. The rotation of the sun gear 41 drives the planet carrier 43 to rotate, and the planet carrier 43 outputs the first torque; the first inner gear ring 2, the second inner gear ring 3 and the planetary gear 42 constitute a small tooth difference transmission, and the second inner gear ring 3 outputs the second torque.

[0033] The working process of the coaxial dual-speed ratio output gearbox is as follows:

[0034] Two outputs with different transmission ratios are realized in the same gearbox to meet the needs of switching transmission ratios of operations. When the operation requires a small transmission ratio, the first torque output is adopted; when the operation requires a large transmission ratio, the second torque output is adopted; wherein, the first torque output: the operation of the driving mechanism 1 drives the sun gear 41 to rotate, the sun gear 41 meshes with the planetary gear 42, and then drives the planetary carrier 43 on the planetary gear 42 to rotate, and outputs a small transmission ratio through the planetary carrier 43; the second torque output: the operation of the driving mechanism 1 drives the sun gear 41 to rotate, the sun gear 41 meshes with the planetary gear 42, the planetary gear 42 meshes with the second inner gear ring 3, the second inner gear ring and the first inner gear ring and the planetary gear form a small tooth difference transmission, drive the output cover 21 on the second inner gear ring 3 to rotate, and output a large transmission ratio through the output cover 21. The first torque output and the second torque output share the sun gear 41 and the planetary gear 42, and realize the output of two transmission ratios with a smaller structural size. The coaxial dual-output design improves the adaptability and flexibility of the motor, has a compact structure, reduces weight, and reduces costs.

[0035] Continue to see Figure 1-7 In this embodiment, a base 5 is also included, and the first inner gear ring 2 and the driving mechanism 1 are respectively arranged on the base 5.

[0036] Specifically, the base 5 includes an upper shell 52 and an outer cover 53, the driving mechanism 1 is between the upper shell 52 and the outer cover 53, the first inner gear ring 2 is fixed on the upper shell 52, and in this embodiment, the outer wall of the second inner gear ring 2 is provided with a first groove, and the upper shell 52 of the base 5 is provided with a second groove corresponding to the first groove, and a positioning pin is pressed between the first groove and the second groove to prevent the first inner gear ring 2 and the base 5 from deflecting.

[0037] Furthermore, it also includes a first bearing 6, which is connected to the base 5 and the second inner gear ring 3 respectively.

[0038] Specifically, the first bearings 6 are respectively pressed onto the base 5 , the outer wall of the first bearing 6 is fixedly connected to the base 5 , and the inner wall of the first bearing 6 is in contact with the second inner gear ring 3 .

[0039] Furthermore, it also includes an output shaft 44 , an output cover 21 and a second bearing 72 . The output shaft 44 is fixed on the planet carrier 43 and connected to the output cover 21 via the second bearing 72 .

[0040] Specifically, the output cover 21 is fixedly installed above the moving inner gear ring 3, and the output cover 21 and the second inner gear ring 3 are fixed as a whole. In this embodiment, there are two first bearings 6, and the two first bearings 6 are pressed onto the base 5 respectively. The outer wall of the first bearing 6 is fixedly connected to the base 5, and the inner wall of the first bearing 6 is in contact with the second inner gear ring 3.

[0041] The output cover 21 is connected to the base 5 through the first bearing 6, which can further strengthen the position of the output cover 21 on the base 5, ensure concentricity, and ensure that the second inner gear ring 3 drives the output cover 21 to rotate (the second inner gear ring 3 and the output cover 21 are fixed as a whole). The second bearing 72 is pressed into the output cover 21, and the second bearing 72 is sleeved on the output shaft 44. The output shaft 44 is connected to the output cover 21 through the second bearing 72, so that the output shaft 44 and the output cover 21 can rotate independently of each other, and the transmission ratio of the planetary carrier 43 is output through the output shaft 44, which effectively reduces the structural size of the gear box.

[0042] Furthermore, it also includes a limit shaft retaining ring 71 , and the limit shaft retaining ring 71 is sleeved on the output shaft 44 .

[0043] Specifically, the limiting shaft retaining ring 71 is pressed onto the output shaft 44. In one embodiment, the output shaft 44 is provided with a limiting portion 441, and the second bearing 72 is installed below the limiting portion 441. The limiting shaft retaining ring 71 is at the limiting portion 441 of the transmission shaft 44. The limiting portion 441 is an annular groove of the transmission shaft 44. The limiting shaft retaining ring 71 is an annular sheet-shaped part, so that the limiting shaft retaining ring 71 can be installed into the limiting portion 441, and the second bearing 72 is pressed onto the motor shaft 13 to reduce the wear of the parts. In this embodiment, the upper surface of the second bearing 72 is aligned with the limiting portion 441, and the limiting shaft retaining ring 71 is installed into the limiting portion 441 to prevent the output shaft 44 from moving in the axial direction.

[0044] Furthermore, the output cover 21 is provided with a plurality of evenly distributed connection holes 212 .

[0045] Specifically, the connection hole 212 is used to connect and fix with the device. In one embodiment, the output cover 21 can be connected to the device by passing a bolt through the connection hole 212, so that the output cover 21 drives the device to rotate. The output cover 21 and the second inner gear ring 3 are fixed as a whole to form a small tooth difference transmission, so that the second inner gear ring 3 can output torque.

[0046] Furthermore, the driving mechanism 1 includes a stator assembly 11 , a rotor assembly 12 and a shaft 13 . The motor shaft 13 is connected to the sun gear 41 and the rotor assembly 12 , respectively. The stator assembly 11 surrounds the motor shaft 13 .

[0047] Specifically, the stator assembly 11 includes a coil, and the rotor assembly 12 includes a magnet. When the stator assembly 11 is energized, a magnetic field is generated. The rotor assembly 12 drives the motor shaft 13 to rotate under the action of the magnetic field. The motor shaft 13 further drives the sun gear 41 to rotate, thereby realizing the operation of the gearbox.

[0048] Furthermore, a third bearing 73 is included. The third bearing 73 is press-fitted on the motor shaft 13 and between the rotor assembly 12 and the sun gear 41 .

[0049] Furthermore, the base 5 is provided with a plurality of ribs 51 , and the plurality of ribs 51 surround the second inner gear ring 3 .

[0050] Specifically, screw holes are provided on the ribs 51. In this embodiment, the ribs 51 surround the bearing 6 to increase the strength of the connection between the base 5 and the bearing 6. The screw holes on the ribs 51 ensure that the base 5 can be detachably mounted on a preset mechanism by screws.

[0051] Furthermore, the number of teeth of the first inner gear ring 2 is greater than the number of teeth of the second inner gear ring 3 .

[0052] Specifically, the first inner gear ring 2 is fixed, meshes with the teeth of the planetary gear 42, drives the second inner gear ring 3, and forms a small tooth difference transmission. In this embodiment, the tooth difference between the first inner gear ring 2 and the second inner gear ring 3 is three, so that the planetary carrier 43 and the second inner gear ring 3 are output with two transmission ratios respectively. For example: the speed of the motor is 3000 rpm. Through the deceleration of the small tooth difference transmission and the planetary gear transmission, the speed of the output shaft 44 can be reduced to 34 rpm and 625 rpm, and the output torque is increased. The specific reduction ratio and torque amplification ratio can be adjusted according to the actual application requirements. When torque is needed, a large reduction ratio of 34 rpm is used to obtain large torque. In scenarios where the torque requirement is not large, a small reduction ratio of 625RPM is used to output high efficiency.

[0053] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0059] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

[0060] The above is a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A coaxial dual-speed ratio output gearbox, characterized in that: It includes a driving mechanism, a first inner gear ring, a second inner gear ring and a transmission mechanism; The transmission mechanism comprises a planet carrier, a sun gear and planetary wheels, wherein the planetary wheels are arranged on the planet carrier, the planetary wheels surround the sun gear, the planetary wheels mesh with the first inner gear ring, and the planetary wheels mesh with the second inner gear ring; The driving mechanism is connected to the sun gear; The planet carrier outputs a first torque, and the second inner gear ring outputs a second torque.

2. The coaxial dual-speed ratio output gearbox according to claim 1, characterized in that: It also includes a base, and the first inner gear ring and the driving mechanism are respectively arranged on the base.

3. The coaxial dual-speed ratio output gearbox according to claim 2, characterized in that: It also includes a first bearing, which is connected to the base and the second inner gear ring respectively.

4. The coaxial dual-speed ratio output gearbox according to claim 1, characterized in that: It also includes an output shaft, an output cover and a second bearing. The output shaft is fixed on the planet carrier and connected to the output cover through the second bearing. The second bearing is press-fitted into the output cover.

5. The coaxial dual-speed ratio output gearbox according to claim 4, characterized in that: It also includes a limit shaft retaining ring, which is sleeved on the output shaft.

6. The coaxial dual-speed ratio output gearbox according to claim 4, characterized in that: The output cover is provided with a plurality of connection holes which are evenly distributed.

7. The coaxial dual-speed ratio output gearbox according to claim 1, characterized in that: The driving mechanism comprises a stator assembly, a rotor assembly and a motor shaft. The motor shaft is connected to the sun gear and the rotor assembly respectively, and the stator assembly surrounds the motor shaft.

8. The coaxial dual-speed ratio output gearbox according to claim 7, characterized in that: The motor further comprises a third bearing which is press-fitted on the motor shaft and between the rotor assembly and the sun gear.

9. The coaxial dual-speed ratio output gearbox according to claim 2, characterized in that: The base is provided with a plurality of ribs, and the plurality of ribs surround the second inner gear ring.

10. The coaxial dual-speed ratio output gearbox according to claim 1, characterized in that: The number of teeth of the first inner gear ring is greater than the number of teeth of the second inner gear ring.

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