Direct connection type planetary reducer

Abstract

The utility model discloses a direct connection type planetary reducer, which relates to the technical field of variable speed transmission and comprises a hollow box shell, an input end cover is fixedly mounted at one end of the box shell, an output end cover is fixedly mounted at the other end of the box shell, and an output extension structure protruding outwards is integrally arranged in the middle of the output end cover. An output extension structure is arranged in the box shell, an output mounting channel communicated with the inner space of the box shell penetrates through the middle of the output extension structure, an output shaft is mounted in the output mounting channel, the output shaft extends out of the outer end of the output extension structure, and at least two bearing supporting structures are mounted between the output shaft and the output extension structure; and the inner end of the output shaft is connected with a planetary speed reducing mechanism. The device is small in size and can be directly connected with a traveling wheel for use.

Description

Technical Field

[0001] This utility model relates to the field of speed transmission technology, and in particular to a direct-drive planetary reducer. Background Technology

[0002] Agriculture in hilly areas is a crucial component of agriculture. Due to the undulating terrain and slopes in many work sites, conventional traction chassis are difficult to operate in hilly areas, resulting in a consistently low level of agricultural mechanization. The inventors designed and manufactured a low-center-of-gravity four-wheel-drive traction chassis for use in hilly regions. Each wheel of this traction chassis is equipped with an individual drive motor. Normally, a reducer is still needed between the motor and the wheel to increase output torque and improve driving stability. However, because the overall center of gravity of the aforementioned traction chassis is low, the space between the side wheels and the central equipment is limited, and there is insufficient space between the motor and the corresponding wheel for bearing seats and other connecting structures. Therefore, a small-volume transmission mechanism that can be directly installed and used in the limited space between the motor and the wheel is needed to solve these problems. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a small-sized direct-drive planetary reducer that can be directly connected to the wheels.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a direct-drive planetary reducer, including a hollow housing, an input end cover fixedly installed at one end of the housing and an output end cover fixedly installed at the other end, an outwardly protruding output extension structure integrally provided in the middle of the output end cover, an output mounting channel communicating with the inner space of the housing through the middle of the output extension structure, an output shaft installed in the output mounting channel, the output shaft extending out of the outer end of the output extension structure, at least two bearing support structures installed between the output shaft and the output extension structure; a planetary reduction mechanism is connected to the inner end of the output shaft.

[0005] As a preferred technical solution, a separator ring is fitted on the output shaft between two adjacent bearing support structures, an outer limiting protrusion is integrally provided on the output extension structure at the outer port of the output mounting channel, and an inner limiting protrusion is provided on the output shaft at the innermost bearing support structure.

[0006] As a preferred technical solution, a sealing ring is installed between the outermost bearing support structure and the outer limiting protrusion on the output mounting channel.

[0007] As a preferred technical solution, the bearing support structure is a deep groove ball bearing.

[0008] As a preferred technical solution, at least three circumferentially arranged reinforcing structures are integrally provided between the outer peripheral surface of the output extension structure and the output end cover.

[0009] As a preferred technical solution, the reinforcing structure is provided with a reserved connection structure.

[0010] As a preferred technical solution, the planetary reduction mechanism includes a first-stage planetary carrier fixedly mounted on the inner end of the output shaft, three circumferentially arranged first-stage planetary gears rotatably mounted on the first-stage planetary carrier, a first-stage external gear ring fixedly mounted inside the housing, and the first-stage planetary gears being constantly meshed with the first-stage external gear ring; and an input port penetrating through the middle of the input end cover.

[0011] As a preferred technical solution, a secondary planetary carrier is installed inside the housing, and three circumferentially arranged secondary planetary gears are rotatably mounted on the secondary planetary carrier. A secondary external gear ring is fixed inside the housing, and the secondary planetary gears are constantly meshed with the secondary external gear ring. A primary sun gear that is constantly meshed with the three primary planetary gears is fixed on the secondary planetary carrier.

[0012] Due to the adoption of the above technical solution, the direct-drive planetary reducer includes a hollow housing. An input end cover is fixedly installed at one end of the housing, and an output end cover is fixedly installed at the other end. An outwardly protruding output extension structure is integrally provided in the middle of the output end cover. An output mounting channel, connecting the inner space of the housing, is provided through the middle of the output extension structure. An output shaft is installed within the output mounting channel, extending beyond the outer end of the output extension structure. At least two bearing support structures are installed between the output shaft and the output extension structure. A planetary reduction mechanism is connected to the inner end of the output shaft. This invention utilizes the relatively long output mounting channel to install the output shaft, and uses at least two bearing support structures for support. The connection of the output shaft only at the output mounting channel provides strong bending resistance between it and the housing. In the case of fixed installation, a traveling wheel can be directly connected to the outer end of the output shaft, eliminating the need for additional bearing seats or other structures. Furthermore, this invention is small in size and can be installed in a small space between the motor and the traveling wheel. Attached Figure Description

[0013] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0014] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the present utility model;

[0015] Figure 2 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0016] Figure 3 This is an exploded structural diagram of an embodiment of the present invention.

[0017] In the diagram: 1-Shell; 2-Input end cover; 21-Input port; 3-Output end cover; 31-Output extension structure; 32-Output mounting channel; 33-Reinforcing structure; 34-Reserved connection structure; 4-Output shaft; 41-Bearing support structure; 42-Separating ring; 43-Outer limiting protrusion; 44-Inner limiting protrusion; 45-Sealing ring; 5-Planetary reduction mechanism; 51-First-stage planetary carrier; 52-First-stage planetary gear; 53-First-stage external gear ring; 54-First-stage sun gear; 55-Second-stage planetary carrier; 56-Second-stage planetary gear; 57-Second-stage external gear ring; 58-Input sun gear. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0019] like Figure 1 , Figure 2 and Figure 3 As shown, the direct-drive planetary reducer includes a hollow housing 1. An input end cover 2 is fixedly installed at one end of the housing 1, and an output end cover 3 is fixedly installed at the other end. The housing 1, the input end cover 2, and the output end cover 3 together form a rigid housing structure. The input end cover 2 and the output end cover 3 can be fixedly installed by connecting them with several circumferentially arranged bolts; this is a well-known and commonly used method, and will not be elaborated further here.

[0020] The output end cover 3 has an integrally formed output extension structure 31 that protrudes outward in the middle. The output extension structure 31 has an output mounting channel 32 that connects to the inner space of the housing 1 through the middle. An output shaft 4 is installed in the output mounting channel 32. The output shaft 4 extends out of the outer end of the output extension structure 31. At least two bearing support structures 41 are installed between the output shaft 4 and the output extension structure 31.

[0021] In this embodiment, by setting the output extension structure 31, the output shaft 4 can be installed using at least two bearing support structures 41 with this small volume. With support at at least two points, the output shaft 4 can form a good overall bending resistance with the housing. The outer end of the output shaft 4 can be directly used to install the walking wheel and meet the walking wheel's support and walking requirements.

[0022] Furthermore, a separator ring 42 is fitted on the output shaft 4 between two adjacent bearing support structures 41 to limit the distance between adjacent bearing support structures 41; an outer limiting protrusion 43 is integrally provided on the output extension structure 31 at the outer port of the output mounting channel 32 to limit the outermost bearing support structure 41; an inner limiting protrusion 44 is provided on the output shaft 4 at the innermost bearing support structure 41 to limit the innermost bearing support structure 41. Through the above settings, the axial positioning and installation of the output shaft 4 and the bearing support structure 41 are achieved.

[0023] Preferably, a sealing ring 45 is installed on the output mounting channel 32 between the outermost bearing support structure 41 and the outer limiting protrusion 43 to reduce external contamination such as water and dust. This embodiment illustrates that there are two bearing support structures 41, which are shown as deep groove ball bearings.

[0024] Preferably, at least three circumferentially arranged reinforcing structures 33 are integrally formed between the outer peripheral surface of the output extension structure 31 and the output end cover 3 to improve the bending resistance of the output extension structure 31 and further enhance the overall bending resistance between the output shaft 4 and the housing. Thus, the output end cover 3, the output extension structure 31, and the reinforcing structures 33 can be integrally cast, simplifying manufacturing.

[0025] Preferably, the reinforcing structure 33 is provided with a reserved connection structure 34 to facilitate the installation of structures such as brakes at the output end cover 3. The reserved connection structure 34 can be a threaded hole or an ear plate, etc., for installation purposes, and is not limited thereto.

[0026] The inner end of the output shaft 4 is connected to a planetary reduction mechanism 5 to achieve the speed reduction transmission purpose of this embodiment, enabling a stable high torque output at the output shaft 4. With the output shaft 4 reliably supported, the planetary reduction mechanism 5 does not bear any additional lateral torque, ensuring smooth and reliable operation.

[0027] The planetary reduction mechanism 5 described in this embodiment includes a first-stage planetary carrier 51 fixedly mounted on the inner end of the output shaft 4. Three circumferentially arranged first-stage planetary gears 52 are rotatably mounted on the first-stage planetary carrier 51. A first-stage external gear ring 53 is fixedly mounted inside the housing 1, and the first-stage planetary gears 52 are constantly meshed with the first-stage external gear ring 53. An input port 21 is provided through the center of the input end cover 2. The input port 21 is used to pass through the engine's power shaft, on which an input sun gear 58 is mounted. With the input sun gear 58 directly meshing with the three first-stage planetary gears 52, this embodiment achieves a first-stage planetary reduction transmission.

[0028] In this embodiment, a secondary planetary carrier 55 is installed inside the housing 1. Three circumferentially arranged secondary planetary gears 56 are rotatably mounted on the secondary planetary carrier 55. A secondary external gear ring 57 is fixedly installed inside the housing 1, and the secondary planetary gears 56 are constantly meshed with the secondary external gear ring 57. A primary sun gear 54, which is constantly meshed with the three primary planetary gears 52, is fixedly installed on the secondary planetary carrier 55. Through the above arrangement, the input sun gear 58 is constantly meshed with the three secondary planetary gears 56. This embodiment realizes a two-stage planetary reduction transmission, further improving the output torque of the output shaft 4.

[0029] In this embodiment, the output shaft 4 is mounted on the compact output extension structure 31 using at least two bearing support structures 41. The output shaft 4 and the housing form a strong bending resistance as a whole. In the case of fixed installation, the outer end of the output shaft 4 can be directly connected to the traveling wheel, and the traveling wheel installation does not require additional bearing seats or other structures. Furthermore, this embodiment has a small overall size, allowing installation to be completed in the small space between the motor and the traveling wheel.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A direct-drive planetary reducer, comprising a hollow housing, wherein an input end cover is fixedly installed at one end of the housing and an output end cover is fixedly installed at the other end, characterized in that: The output end cover has an integrally formed output extension structure protruding outward in the middle. The output extension structure has an output mounting channel through the middle that connects to the inner space of the housing. An output shaft is installed in the output mounting channel. The output shaft extends outward from the outer end of the output extension structure. At least two bearing support structures are installed between the output shaft and the output extension structure. A planetary reduction mechanism is connected to the inner end of the output shaft.

2. The direct-drive planetary reducer as described in claim 1, characterized in that: A separator ring is fitted on the output shaft between two adjacent bearing support structures. An outer limiting protrusion is integrally provided on the output extension structure at the outer port of the output mounting channel. An inner limiting protrusion is provided on the output shaft at the innermost bearing support structure.

3. The direct-drive planetary reducer as described in claim 2, characterized in that: A sealing ring is installed between the outermost bearing support structure and the outer limiting protrusion on the output mounting channel.

4. The direct-drive planetary reducer as described in claim 1, characterized in that: The bearing support structure is a deep groove ball bearing.

5. The direct-drive planetary reducer as described in claim 1, characterized in that: At least three circumferentially arranged reinforcing structures are integrally provided between the outer peripheral surface of the output extension structure and the output end cap.

6. The direct-drive planetary reducer as described in claim 5, characterized in that: The reinforcing structure is provided with a reserved connection structure.

7. The direct-drive planetary reducer as described in any one of claims 1 to 6, characterized in that: The planetary reduction mechanism includes a primary planetary carrier fixedly mounted on the inner end of the output shaft, on which three circumferentially arranged primary planetary gears are rotatably mounted. A primary external gear ring is fixedly mounted inside the housing, and the primary planetary gears are constantly meshed with the primary external gear ring. An input port is provided through the middle of the input end cover.

8. The direct-drive planetary reducer as described in claim 7, characterized in that: A secondary planetary carrier is installed inside the housing, and three circumferentially arranged secondary planetary gears are rotatably mounted on the secondary planetary carrier. A secondary external gear ring is fixed inside the housing, and the secondary planetary gears are constantly meshed with the secondary external gear ring. A primary sun gear is fixed on the secondary planetary carrier and is constantly meshed with the three primary planetary gears.

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