Planetary roller screw actuated swing cylinder

Abstract

A planet roller screw transmission swing cylinder, including left cylinder, right cylinder, main screw, output shaft and planet roller, output shaft is installed on left cylinder and right cylinder in relative rotation mode, left cylinder is installed with left cylinder cover, left cylinder cover is equipped with left oil port, right cylinder is installed with right cylinder cover, right cylinder cover is equipped with right oil port, main screw is slidably installed in left cylinder and right cylinder, and piston is installed on main screw, planet roller is equipped with several, and is engaged with main screw, planet roller is coaxially fixedly installed with gear, output shaft is fixedly installed with gear ring in the inside, gear ring is engaged with gear, and retaining plate is rotatably assembled on gear ring, and end of planet roller is rotatably assembled on retaining plate, the utility model discloses a planet roller screw transmission structure, effectively solve the problem of low efficiency caused by friction loss, significantly improve transmission efficiency, and the stress concentration of single contact point is reduced, and the running reliability of swing cylinder is improved.

Description

Technical Field

[0001] This utility model relates to the field of swing cylinder technology, and in particular to a planetary roller screw driven swing cylinder. Background Technology

[0002] Swing cylinders are widely used in machining, automated production lines, and construction machinery. Their transmission efficiency directly affects the energy consumption and operational efficiency of the equipment. Traditional swing cylinders mostly use gear transmission or screw-nut transmission, which have obvious technical limitations: gear transmission is prone to tooth surface wear and transmission losses due to meshing clearance, while screw-nut transmission suffers from significant energy loss due to large sliding friction on the thread surface, affecting transmission efficiency.

[0003] With the increasing demands for high-efficiency and high-precision transmission in industrial automation, traditional transmission methods are no longer sufficient to meet the low-energy consumption and high-reliability requirements of precision equipment. Planetary roller screw transmission technology, with its unique multi-roller meshing structure, transforms sliding friction into rolling friction, effectively improving transmission efficiency and providing an effective technical solution to the transmission efficiency bottleneck of oscillating cylinders. Currently, planetary roller screws are mostly used in linear transmission scenarios, and their application in oscillating cylinders has not yet developed a mature solution. There is an urgent need to develop corresponding transmission structure designs to fully leverage their high-efficiency transmission characteristics and compensate for the performance shortcomings of traditional oscillating cylinders. Utility Model Content

[0004] To address the above problems, this utility model proposes a planetary roller screw driven swing cylinder, and the technical solution used is as follows: A planetary roller screw driven oscillating cylinder includes a left cylinder, a right cylinder, a main screw, an output shaft, and planetary rollers; the output shaft is mounted on the left and right cylinders in a relatively rotatable manner; a left cylinder cover is mounted on the left cylinder, and the left cylinder cover has a left oil port; a right cylinder cover is mounted on the right cylinder, and the right cylinder cover has a right oil port; the main screw is slidably mounted inside the left and right cylinders, and a piston is mounted on the main screw; The planetary rollers are provided in several parts, all of which mesh with the main screw; a gear is coaxially fixedly installed on the planetary rollers; a gear ring that meshes with the gear is fixedly installed inside the output shaft; a retaining disc is rotatably mounted on the gear ring, and the end of the planetary roller is rotatably mounted on the retaining disc.

[0005] Furthermore, cover plates are fixedly installed on both the left and right ends of the output shaft; a thrust bearing is provided between the cover plate on the left end and the left cylinder, and between the cover plate on the right end and the right cylinder.

[0006] Furthermore, gears are fixedly installed at both ends of the planetary roller; thrust bearings are provided between the gear ring at the left end and the left cylinder, and between the gear ring at the right end and the right cylinder.

[0007] Furthermore, pistons are installed on both the left and right sides of the threaded portion of the main screw; the left cylinder, right cylinder, main screw, output shaft and two sets of pistons together form a lubrication cavity, and the planetary rollers, gears and the threaded portion of the main screw are all located in the lubrication cavity.

[0008] Furthermore, the main screw has a left connecting cavity and a right connecting cavity on its left and right sides, respectively.

[0009] Furthermore, the left cylinder, main screw, and piston located on the left side form the left oil chamber, and the left connecting chamber is connected to the left oil chamber; the right cylinder, main screw, and piston located on the right side form the right oil chamber, and the right connecting chamber is connected to the right oil chamber.

[0010] Furthermore, both the left and right cylinders are fixedly provided with spline teeth inside, and the main screw is provided with a spline groove.

[0011] Furthermore, seals are installed between the piston and the main screw, the left cylinder, and the right cylinder, as well as between the output shaft and the left cylinder and the right cylinder.

[0012] Because this utility model adopts the above-described technical solution, it has the following advantages: 1. This utility model adopts a planetary roller screw transmission structure, which transforms the sliding friction of traditional screw and nut transmission into rolling friction, significantly reducing the friction coefficient and effectively solving the problem of low efficiency caused by friction loss. Compared with gear transmission, the multi-tooth meshing structure of the planetary roller screw disperses the load, avoids transmission loss caused by local wear of tooth surfaces and meshing clearance, and significantly improves transmission efficiency.

[0013] 2. The multi-roller uniform distribution structure of this utility model enables the load to be evenly distributed, reduces stress concentration at individual contact points, avoids tooth surface wear and tooth breakage in traditional gear transmissions, and thread surface wear and jamming in lead screw and nut transmissions, and significantly improves the operational reliability of the swing cylinder. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the vertical cross-sectional structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the vertical cross-sectional structure of the present invention after the main screw has been removed.

[0017] Figure 4 This is a schematic diagram of the vertical cross-sectional structure of the present invention after the left cylinder, right cylinder and main screw have been removed.

[0018] Figure 5This is a schematic diagram of the assembly structure of the main screw, planetary rollers and gears of this utility model.

[0019] Icon labels: 1-Left cylinder; 101-Left cylinder head; 102-Left oil port; 2-Right cylinder; 201-Right cylinder head; 202-Right oil port; 3-Main screw; 301-Left connecting cavity; 302-Right connecting cavity; 4-Piston; 5-Output shaft; 6-Side cover; 7-Thrust bearing one; 8-Thrust bearing two; 9-Ring gear; 10-Retaining disc; 11-Planetary roller; 12-Gear; A - Left oil chamber; B - Right oil chamber; C - Lubrication chamber. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this utility model; however, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "in", "out", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example:

[0022] A planetary roller screw driven oscillating cylinder, such as Figures 1-5 As shown, the system includes a left cylinder 1, a right cylinder 2, a main screw 3, and an output shaft 5. The left cylinder 1, output shaft 5, and right cylinder 2 are installed together from left to right. The output shaft 5 is mounted on the left cylinder 1 and right cylinder 2 in a relatively rotatable manner, and a cover 6 is fixedly installed on both ends of the output shaft 5. Thrust bearings 7 are provided between the left cover 6 and the left cylinder 1, and between the right cover 6 and the right cylinder 2. A left cylinder cover 101 is installed on the left cylinder 1, and a left oil port 102 is provided on the left cylinder cover 101. A right cylinder cover 201 is installed on the right cylinder 2, and a right oil port 202 is provided on the right cylinder cover 201. The main screw 3 is slidably installed inside the left cylinder 1 and right cylinder 2. A left connecting cavity 301 and a right connecting cavity 302 are provided on the left and right sides of the main screw 3, respectively. Pistons 4 are installed on both sides of the threaded portion of the main screw 3. This embodiment has several sets of planetary rollers 11 that mesh with the main screw 3. Each planetary roller 11 has a gear 12 coaxially fixedly installed at both ends. Corresponding to the gears 12 on both sides, two gear rings 9 are coaxially fixedly installed inside the output shaft 5. The gear rings 9 mesh with all the gears 12 on the same side. A retaining disk 10 is rotatably mounted on the gear rings 9, and the ends of the planetary rollers 11 are rotatably mounted on the retaining disks 10. Thrust bearings 8 are provided between the left gear ring 9 and the left cylinder 1, and between the right gear ring 9 and the right cylinder 2.

[0023] The left cylinder 1, main screw 3, and piston 4 located on the left side form the left oil chamber A. The left connecting chamber 301 has a through hole on its side wall, allowing the left connecting chamber 301 to communicate with the left oil chamber A. The right cylinder 2, main screw 3, and piston 4 located on the right side form the right oil chamber B. The right connecting chamber 302 has a through hole on its side wall, allowing the right connecting chamber 302 to communicate with the right oil chamber B. The left cylinder 1, right cylinder 2, main screw 3, output shaft 5, and two sets of pistons 4 form the lubrication chamber C. The planetary roller 11, gear 12, and the threaded portion of the main screw 3 are all located within the lubrication chamber C.

[0024] As a specific implementation of this embodiment, spline teeth are fixedly provided inside both the left cylinder 1 and the right cylinder 2, and a spline groove is provided on the main screw 3, so that the main screw 3 is slidably installed in the left cylinder 1 and the right cylinder 2.

[0025] As a specific implementation of this embodiment, seals are installed between the piston 4 and the main screw 3, the left cylinder 1, and the right cylinder 2, as well as between the output shaft 5 and the left cylinder 1 and the right cylinder 2, to prevent oil leakage.

[0026] The working principle of this embodiment is as follows: In actual use, the left cylinder 1 and the right cylinder 2 are fixed, and the left oil port 102 and the right oil port 202 are connected to the external oil supply device. During operation, oil enters from one side and exits from the other side. Taking the example of oil entering from the left oil port 102 and exiting from the right oil port 202, the oil enters the left oil chamber A through the left connecting cavity 301, pushing the main screw 3 to move to the right. The oil in the right oil chamber B enters the right connecting cavity 302 and flows out through the right oil port 202.

[0027] When the main screw 3 moves, its threaded portion will drive the planetary rollers 11 to revolve and rotate. The revolve of the planetary rollers 11 will drive the retaining disk 10 to rotate relative to the gear ring 9. At the same time, the rotation of the planetary rollers 11 will drive the gear 12 on it to rotate. The gear 12 on the planetary rollers 11 will drive the gear ring 9 to rotate. The gear ring 9 will drive the output shaft 5 to rotate. The output shaft 5 can drive the load to swing.

[0028] Lubricating oil is injected into the lubrication chamber C to reduce friction and wear on components such as the main screw 3, planetary rollers 11, gears 12, and gear ring 9 during operation, thereby extending their service life.

Claims

1. A planetary roller screw actuated swing cylinder characterized by, It includes a left cylinder (1), a right cylinder (2), a main screw (3), an output shaft (5), and planetary rollers (11); the output shaft (5) is mounted on the left cylinder (1) and the right cylinder (2) in a relatively rotatable manner; a left cylinder head (101) is mounted on the left cylinder (1), and a left oil port (102) is provided on the left cylinder head (101); a right cylinder head (201) is mounted on the right cylinder (2), and a right oil port (202) is provided on the right cylinder head (201); the main screw (3) is slidably mounted inside the left cylinder (1) and the right cylinder (2), and a piston (4) is mounted on the main screw (3); The planetary rollers (11) are provided in several parts, all of which mesh with the main screw (3); a gear (12) is coaxially fixedly installed on the planetary rollers (11); a gear ring (9) that meshes with the gear (12) is fixedly installed inside the output shaft (5); a retaining disc (10) is rotatably mounted on the gear ring (9), and the end of the planetary rollers (11) is rotatably mounted on the retaining disc (10).

2. A planetary roller screw actuated swing cylinder according to claim 1, wherein, The output shaft (5) is fixedly installed with cover (6) at both ends; a thrust bearing (7) is provided between the cover (6) at the left end and the left cylinder (1), and between the cover (6) at the right end and the right cylinder (2).

3. The planetary roller screw actuated swing cylinder of claim 1, wherein, Gears (12) are fixedly installed at both ends of the planetary roller (11); thrust bearings (8) are provided between the left end gear ring (9) and the left cylinder (1) and between the right end gear ring (9) and the right cylinder (2).

4. The planetary roller screw actuated swing cylinder of claim 1, wherein, The main screw (3) has pistons (4) installed on both the left and right sides of the threaded portion; the left cylinder (1), right cylinder (2), main screw (3), output shaft (5) and two sets of pistons (4) together form a lubrication cavity (C), and the planetary roller (11), gear (12) and the threaded portion of the main screw (3) are all located in the lubrication cavity (C).

5. A planetary roller screw actuated swing cylinder as claimed in claim 4, wherein, The main screw (3) is provided with a left connecting cavity (301) and a right connecting cavity (302) on its left and right sides, respectively.

6. A planetary roller screw actuated swing cylinder as claimed in claim 5, wherein, The left cylinder (1), main screw (3) and piston (4) located on the left side form the left oil chamber (A), and the left connecting chamber (301) is connected to the left oil chamber (A); the right cylinder (2), main screw (3) and piston (4) located on the right side form the right oil chamber (B), and the right connecting chamber (302) is connected to the right oil chamber (B).

7. The planetary roller screw actuated swing cylinder of claim 1, wherein, Both the left cylinder (1) and the right cylinder (2) are fixedly provided with spline teeth, and the main screw (3) is provided with a spline groove.

8. The planetary roller screw actuated swing cylinder of claim 1, wherein, Seals are installed between the piston (4) and the main screw (3), the left cylinder (1), and the right cylinder (2), as well as between the output shaft (5) and the left cylinder (1) and the right cylinder (2).

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