A cycloidal speed reducer

Abstract

This utility model discloses a cycloidal pinwheel reducer, relating to the field of mechanical transmission technology. It includes a base; an output shaft mounted on the inner wall of the base, with a through hole along its centerline; and an input shaft mounted inside the output shaft through the through hole. An eccentric sleeve is mounted at one end of the input shaft, and a cycloidal wheel assembly is mounted on the outer wall of the eccentric sleeve. A pin gear ring is fitted onto the outer wall of the cycloidal wheel assembly. This utility model, through the coordinated operation of the base, input shaft, output shaft, cycloidal wheel assembly, and pin gear ring, and the same-side design of the input and output shafts, shortens the axial dimension, making the equipment more compact, effectively saving raw materials, reducing space occupation, and improving the convenience of installation, use, and maintenance. Furthermore, through the meshing of the cycloidal wheel assembly and the pin gear ring, the two shafts achieve opposite power transmission directions while maintaining transmission efficiency and load-bearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, specifically to a cycloidal pinwheel reducer. Background Technology

[0002] The cycloidal pinwheel reducer is a high-efficiency and precision transmission device based on the planetary transmission principle and employing cycloidal pin gear meshing technology. It is widely used in various mechanical equipment and has significant advantages such as a wide transmission ratio range, high transmission efficiency, compact structure, and strong load-bearing capacity. Its core working principle is as follows: the input shaft drives the double eccentric sleeve to rotate, which in turn drives the cycloidal wheel to perform compound motion. The internal meshing between the cycloidal wheel and the pin gear, with a tooth difference of one tooth, achieves speed reduction. Finally, the W output mechanism transmits the low-speed rotation to the output shaft. This reducer is not only widely used in traditional industrial fields and high-end equipment scenarios, but also in emerging fields such as humanoid robots. By optimizing the structure and reducing the thickness, its applicability is further improved.

[0003] Chinese utility model patent CN221396379U discloses a cycloidal pinwheel reducer. The reducer body directly integrates the output shaft, motor cooling fan shaft, and motor base. Based on this, this application proposes a dual-purpose cycloidal pinwheel reducer: one motor can simultaneously power both the cross-cutting winding machine and the cycloidal pinwheel reducer. In the prior art, the cross-cutting carriage requires two motors. One motor drives the circular blade, and the other geared motor drives the transverse travel carriage to complete the transverse cutting of the fabric, thus saving energy, electrical materials, and equipment accessories.

[0004] In actual operation, the input and output shafts of existing cycloidal pinwheel reducers are often fixed on opposite sides of the equipment. When used in confined spaces, the narrow space makes it difficult for operators to install and maintain the reducer, resulting in many inconveniences. Utility Model Content

[0005] The purpose of this invention is to provide a cycloidal pinwheel reducer to solve the problem of inconvenient installation and maintenance of existing products in narrow spaces.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cycloidal pinwheel reducer, including a base;

[0007] An output shaft is mounted on the inner wall of the base, and the output shaft has a through hole along the center line;

[0008] An input shaft is installed inside an output shaft through a through hole. An eccentric sleeve is installed at one end of the input shaft, and a cycloidal wheel assembly is installed on the outer wall of the eccentric sleeve.

[0009] The outer wall of the cycloidal wheel assembly is fitted with a pin tooth ring, and one end of the cycloidal wheel assembly is embedded with multiple pin sleeves. Each of the multiple pin sleeves contains a pin body, and one end of each pin body is installed on the other end of the output shaft. A crank disc is fitted together on the outer side of each of the multiple pin bodies.

[0010] Furthermore, the input shaft and the output shaft are both located on the same side of the base, and the central axis of the input shaft coincides with the central axis of the output shaft. The input shaft and the output shaft transmit power in opposite directions.

[0011] Furthermore, the input shaft transmits power and rotation to the cycloidal wheel assembly through an eccentric sleeve, and the cycloidal wheel assembly transmits rotation in the reverse direction to the output shaft through a pin body. The cycloidal wheel assembly includes two cycloidal wheels with a phase difference of 180°, and the tooth profile of the cycloidal wheel assembly meshes with the internal teeth of the pin tooth ring.

[0012] Furthermore, the crank disc engages with the pin hole on the cycloidal wheel assembly via a pin body, thereby converting the planar motion of the cycloidal wheel assembly into the reverse rotational motion of the output shaft.

[0013] Furthermore, a small skeleton oil seal and a left support bearing are installed between the inner wall of the output shaft and the outer wall of the input shaft, a right support bearing is installed between one end of the output shaft and the outer wall of the input shaft, and a large end cap is installed at one end of the pin gear ring.

[0014] Furthermore, a middle support bearing is installed on the inner wall of the large end cover, a large frame oil seal and a large support bearing are installed between the outer wall of the output shaft and the inner wall of the base, and a small end cover is installed at one end of the large end cover.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) This utility model achieves its axial dimension by coordinating the work of components such as the base, input shaft, output shaft, cycloidal wheel assembly, and pin tooth ring. The same-side design of the input and output shafts shortens the axial dimension, making the equipment more compact, effectively saving raw materials, reducing space occupation, and improving the convenience of installation, use, and maintenance. In addition, through the meshing of the cycloidal wheel assembly and the pin tooth ring, the two shafts achieve opposite power transmission directions while maintaining transmission efficiency and load-bearing capacity.

[0017] (2) This utility model optimizes the bearing support and sealing structure by working together with components such as small skeleton oil seal, left support bearing, large skeleton oil seal and large support bearing, making the reducer compact and sealed as a whole, improving the utilization rate of the internal space of the reducer, and the input shaft of the reducer can be extended to extend from the small end cover on the right side of the base, which is convenient for installing auxiliary devices such as backstop, encoder, and cooling fan. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 One of the overall structural schematic diagrams provided for an embodiment of this utility model;

[0020] Figure 2 Provided for embodiments of this utility model Figure 1 Enlarged view of the structure of A in the middle;

[0021] Figure 3 Provided for embodiments of this utility model Figure 1 Enlarged view of the structure of B in the middle;

[0022] Figure 4 The second schematic diagram of the overall structure provided for an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Base; 2. Input shaft; 3. Output shaft; 4. Cycloidal wheel assembly; 5. Pin gear ring; 6. Eccentric sleeve; 7. Pin body; 8. Crank disc; 9. Pin sleeve; 10. Through hole; 11. Left support bearing; 12. Right support bearing; 13. Middle support bearing; 14. Large support bearing; 15. Large end cover; 16. Small end cover; 17. Small skeleton oil seal; 18. Large skeleton oil seal. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] As attached Figure 1 To be continued Figure 4 As shown:

[0027] Example 1:

[0028] This utility model provides a cycloidal pinwheel reducer, including a base 1;

[0029] Output shaft 3 is installed on the inner wall of the base 1. Output shaft 3 is a key component for the power output of the reducer. Its material is generally high-strength alloy steel to ensure reliability and durability in the power transmission process. Output shaft 3 has a through hole 10 along the center line.

[0030] Input shaft 2 is installed inside output shaft 3 through through hole 10. Input shaft 2 is a power input component, which is connected to an external power source (such as a motor) to introduce power into the reducer. An eccentric sleeve 6 is installed at one end of input shaft 2. The design of eccentric sleeve 6 is one of the key components to realize the cycloidal pinwheel transmission principle. The accuracy of its eccentricity has an important impact on the performance of the reducer. Cycloidal wheel set 4 is installed on the outer wall of eccentric sleeve 6.

[0031] The outer wall of the cycloidal wheel assembly 4 is fitted with a pin tooth ring 5. The pin tooth ring 5 is usually made of a wear-resistant alloy material and undergoes appropriate heat treatment to improve its hardness and wear resistance. One end of the cycloidal wheel assembly 4 is embedded with multiple pin sleeves 9. Each pin sleeve 9 has a pin body 7 installed inside. The cooperation between the pin body 7 and the pin sleeve 9 plays the role of transmitting power and motion, and at the same time plays a certain role of constraining and guiding the motion of the cycloidal wheel assembly 4. One end of each pin body 7 is installed on the other end of the output shaft 3. The outer sides of the multiple pin bodies 7 are fitted with a crank disc 8.

[0032] The input shaft 2 and the output shaft 3 are both located on the same side of the base 1, and the central axis of the input shaft 2 coincides with the central axis of the output shaft 3. The input shaft 2 and the output shaft 3 transmit power in opposite directions.

[0033] The input shaft 2 transmits power and rotation to the cycloidal wheel assembly 4 through the eccentric sleeve 6. The cycloidal wheel assembly 4 transmits rotation in the reverse direction to the output shaft 3 through the pin body 7. The cycloidal wheel assembly 4 includes two cycloidal wheels with a phase difference of 180°. This design of double cycloidal wheels with a phase difference of 180° can effectively balance the radial force during the operation of the reducer, improve the smoothness and reliability of the reducer's operation. The tooth profile design of the cycloidal wheels is based on the mathematical principle of cycloidal pinwheel transmission. The precision of the tooth profile is ensured through precise machining process to achieve good meshing with the pin tooth ring 5. The tooth profile of the cycloidal wheel assembly 4 meshes with the internal teeth of the pin tooth ring 5, playing the role of transmitting power and changing the direction of motion during the transmission process.

[0034] The crank disc 8 engages with the pin hole on the cycloidal wheel assembly 4 through the pin body 7, converting the planar motion of the cycloidal wheel assembly 4 into the reverse rotational motion of the output shaft 3. The shape and size design of the crank disc 8 need to match with the cycloidal wheel assembly 4 and the pin body 7 to ensure accurate transmission of motion.

[0035] Working principle: During use, the input shaft 2 is installed inside the output shaft 3 through the through hole 10. Both are fixed on the same side of the base 1 and their central axes coincide, but the directions of power transmission are opposite. The same-side design of the input shaft 2 and the output shaft 3 shortens the axial dimension, making the equipment more compact, effectively saving raw materials and reducing space occupation. It also improves the convenience of installation, use and maintenance. In addition, when the input shaft 2 rotates, the eccentric sleeve 6 connected to it rotates accordingly, thereby driving the cycloidal wheel assembly 4 installed on the outer wall of the eccentric sleeve 6 to perform compound motion. The cycloidal wheel assembly 4 consists of two cycloidal wheels with a phase difference of 180°, and their tooth profiles are sleeved on the base 1. The inner teeth of the pin tooth ring 5 on the outer wall of the cycloidal wheel assembly 4 are tightly meshed, forming a key structure for speed reduction and torque increase. The cycloidal wheel assembly 4 transmits the rotational motion to the output shaft 3 in the reverse direction through multiple pin sleeves 9 and the internal pin body 7. This converts the planar motion of the cycloidal wheel assembly 4 into the reverse rotational motion of the output shaft 3, ultimately achieving efficient and stable power transmission from the input shaft 2 to the output shaft 3. The two shafts achieve opposite power transmission directions while maintaining transmission efficiency and load-bearing capacity. Its core innovation lies in the fact that through the same-side shaft system layout and special transmission mechanism design, the axial dimension is significantly shortened while maintaining transmission efficiency, improving the convenience of installation and maintenance of the equipment in narrow spaces.

[0036] Example 2:

[0037] This embodiment is basically the same as the previous embodiment, except that a small skeleton oil seal 17 and a left support bearing 11 are installed between the inner wall of the output shaft 3 and the outer wall of the input shaft 2. The small skeleton oil seal 17 is made of rubber and has an internal metal skeleton for support, providing good sealing performance and elasticity. The lip of the small skeleton oil seal 17 is tightly fitted to the outer wall of the input shaft 2, preventing lubricating oil leakage and preventing external impurities from entering. The left support bearing 11 is a rolling bearing with an inner ring, an outer ring, and rolling elements, capable of withstanding radial loads. The inner ring of the left support bearing 11 is interference-fitted with the input shaft 2, and the outer ring is interference-fitted with the output shaft 3. The inner wall of the input shaft 2 is press-fitted to achieve stable support inside the output shaft 3. A right support bearing 12 is installed between one end of the output shaft 3 and the outer wall of the input shaft 2. The right support bearing 12 is also a rolling bearing and has the ability to withstand radial loads. Its structure is similar to that of the left support bearing 11. A large end cover 15 is installed at one end of the pin gear ring 5. The large end cover 15 is generally made of metal and has high strength and rigidity. Its shape is designed according to the overall structure of the reducer. It is usually disc-shaped and has mounting holes. The large end cover 15 is connected to the base 1 and the pin gear ring 5 by bolts, which serves to fix and support the pin gear ring 5.

[0038] A middle support bearing 13 is installed on the inner wall of the large end cover 15. The middle support bearing 13 is a rolling bearing. A large skeleton oil seal 18 and a large support bearing 14 are installed between the outer wall of the output shaft 3 and the inner wall of the base 1. The large skeleton oil seal 18 is similar to the small skeleton oil seal 17, but larger in size to meet the sealing requirements between the output shaft 3 and the base 1. The lip of the large skeleton oil seal 18 fits tightly against the outer wall of the output shaft 3 to prevent lubricating oil from leaking between the output shaft 3 and the base 1. The large support bearing 14 is a rolling bearing that can withstand large radial and axial loads. The inner ring of the large support bearing 14 is interference-fitted with the output shaft 3, and the outer ring is interference-fitted with the inner wall of the base 1, providing stable support for the output shaft 3 and ensuring smooth operation of the output shaft 3 during power transmission. A small end cover 16 is installed at one end of the large end cover 15. The small end cover 16 is usually made of metal or plastic, and is small and simple in shape. It is mainly used to close one end of the large end cover 15, serving both protective and aesthetic purposes. The small end cover 16 and the large end cover 15 are fastened together with bolts to form a closed space, preventing external impurities from entering the reducer.

[0039] Working principle: When the input shaft 2 starts to rotate, the eccentric sleeve 6 mounted on it rotates accordingly, thereby driving the cycloidal wheel assembly 4 to perform a compound motion. The cycloidal wheel assembly 4 consists of at least two cycloidal wheels with a phase difference of 180°, whose tooth profiles mesh tightly with the internal teeth of the pin tooth ring 5. During this period, the small skeleton oil seal 17 set between the inner wall of the output shaft 3 and the outer wall of the input shaft 2 effectively prevents lubricating oil leakage. At the same time, the left support bearing 11 and the right support bearing 12 provide stable support for the input shaft 2, reducing vibration and sway. The middle support bearing 13 on the inner wall of the large end cap 15 at one end of the pin tooth ring 5 provides additional support for the pin tooth ring 5, ensuring good contact between the cycloidal wheel assembly 4 and the pin tooth ring 5. With good meshing, the cycloidal wheel assembly 4 transmits rotation in the reverse direction to the output shaft 3 through the pin body 7. At the same time, the large skeleton oil seal 18 between the outer wall of the output shaft 3 and the inner wall of the base 1 prevents lubricating oil from leaking from this part. The large support bearing 14 provides stable support for the output shaft 3, ensuring that the output shaft 3 smoothly transmits power. The small end cover 16 at one end of the large end cover 15 provides sealed protection for the overall structure, preventing external impurities from entering. By optimizing the bearing support and sealing structure, efficient and stable reverse rotation reduction transmission is achieved, while improving the compactness, sealing and load-bearing capacity of the equipment. It is suitable for occasions with narrow space and high requirements for reducer performance.

[0040] Example 3:

[0041] This embodiment is basically the same as the previous embodiment, except that the reducer is suitable for space-constrained applications, such as conveyor drives, elevator drives, mixing tanks, robot joints, etc.

[0042] When applied to drive the drive roller of a belt conveyor, the motor and reducer can be placed on the outside of the bearing seats at both ends of the roller. The motor shaft and the input shaft 2 of the reducer are connected through the intermediate shaft passing through the inside of the roller to realize power input. After the reducer reduces speed and increases torque, it is connected to the roller body through the output shaft 3, thereby driving the roller to rotate. Its advantages are compact installation, easy maintenance, saving lubricating oil, and auxiliary devices such as backstop and cooling fan can be installed.

[0043] In various mixing applications, the motor and reducer can be placed at the top and bottom or left and right ends of the tank, eliminating the need for the frame used to fix the mixing shaft in traditional mixing systems. The mixing blades are fixed on a hollow tube that runs through the inside of the tank. This hollow tube is connected to the output shaft 3 of the reducer. The motor shaft is connected to the input shaft 2 of the reducer through an intermediate shaft that runs through the inside of the hollow tube to achieve power input. This design reduces the axial space occupied by the mixing system, eliminates the support frame, and replaces the frame function with a hollow mixing shaft, making maintenance easier.

[0044] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A cycloidal speed reducer, characterized by, include: Base (1); Output shaft (3), the output shaft (3) is installed on the inner wall of the base (1), and the output shaft (3) has a through hole (10) along the center line; An input shaft (2) is installed inside an output shaft (3) through a through hole (10). An eccentric sleeve (6) is installed at one end of the input shaft (2), and a cycloidal wheel assembly (4) is installed on the outer wall of the eccentric sleeve (6). The outer wall of the cycloidal wheel assembly (4) is fitted with a pin tooth ring (5), and one end of the cycloidal wheel assembly (4) is embedded with multiple pin sleeves (9). Each of the multiple pin sleeves (9) has a pin body (7) installed inside, and one end of each of the multiple pin bodies (7) is installed on the other end of the output shaft (3). The outer sides of the multiple pin bodies (7) are fitted with a crank disc (8).

2. A cycloidal speed reducer according to claim 1, characterized in that The input shaft (2) and the output shaft (3) are both located on the same side of the base (1), and the central axis of the input shaft (2) coincides with the central axis of the output shaft (3). The input shaft (2) and the output shaft (3) transmit power in opposite directions.

3. The cycloidal pinwheel reducer according to claim 1, characterized in that, The input shaft (2) transmits power and rotation to the cycloidal wheel assembly (4) through the eccentric sleeve (6). The cycloidal wheel assembly (4) transmits rotation in the reverse direction to the output shaft (3) through the pin body (7). The cycloidal wheel assembly (4) includes two cycloidal wheels with a phase difference of 180°. The tooth profile of the cycloidal wheel assembly (4) meshes with the internal teeth of the pin tooth ring (5).

4. A cycloidal pinwheel reducer according to claim 1, characterized in that, The crank disc (8) engages with the pin hole on the cycloidal wheel assembly (4) through the pin body (7), converting the planar motion of the cycloidal wheel assembly (4) into the reverse rotational motion of the output shaft (3).

5. A cycloidal pinwheel reducer according to claim 1, characterized in that, A small skeleton oil seal (17) and a left support bearing (11) are installed between the inner wall of the output shaft (3) and the outer wall of the input shaft (2). A right support bearing (12) is installed between one end of the output shaft (3) and the outer wall of the input shaft (2). A large end cap (15) is installed at one end of the pin tooth ring (5).

6. A cycloidal pinwheel reducer according to claim 5, characterized in that, The inner wall of the large end cover (15) is equipped with a middle support bearing (13), and a large frame oil seal (18) and a large support bearing (14) are installed between the outer wall of the output shaft (3) and the inner wall of the base (1). A small end cover (16) is installed at one end of the large end cover (15).

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