Planetary roller screw with self-lubricating function

Abstract

The utility model discloses a planetary roller lead screw with a self-lubricating function, particularly relates to the field of planetary roller lead screws, and comprises a lead screw body, the lead screw body is connected with a roller body in a matched mode, the two ends of the roller body are both connected with matching plates, the matching plates are matched with the lead screw body in a screwed connection mode, and sealing gaskets are arranged on the outer sides of the matching plates. Fixing plates are arranged on the outer sides of the sealing gaskets, the two matching plates are jointly connected with a shell, a fixing disc is arranged at one end of the shell, an oil injection cylinder is installed at the top end of the shell, an oil receiving bottle is installed at the bottom end of the shell, threaded holes are formed in the middles of the matching plates, and the threaded holes are spirally connected with the lead screw body. A plurality of first through holes are annularly formed in the matching plate, screw grooves are annularly formed in the matching plate, and second through holes corresponding to the screw grooves are annularly formed in the fixing plate. The self-lubricating lead screw has a self-lubricating function, friction borne by the lead screw during rotation is reduced, the transmission precision is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of planetary roller screws, and more specifically, the utility model relates to a planetary roller screw with a self-lubricating function. Background Art

[0002] A screw is a mechanical device that can convert rotational motion and linear motion into each other. There are mainly two commonly used high-efficiency screws at present. One is a ball screw, and the other is a planetary roller screw. The latter mainly consists of a screw, rollers and a nut. Since a threaded roller is used to replace the ball as the force transmission unit, compared with the ball screw, its force transmission unit has a larger contact radius and more contact points. Therefore, the rated load, stiffness, speed and service life are all improved. However, the increase in the contact radius and contact points of the contact force transmission unit also leads to an increase in the friction force received by the force transmission unit.

[0003] The utility model patent with the patent publication number CN213575395U discloses a planetary roller screw, including: a split nut assembly, the split nut assembly includes a sleeve, a first nut, a second nut, and an axial positioning member. One end of the sleeve has an opening for the first nut and the second nut to be inserted. The first nut and the second nut are respectively installed at both ends of the sleeve. There is a limiting structure between the first nut and the second nut and the sleeve to limit the rotation of the first nut and the second nut. The axial positioning member is installed at the opening of the sleeve for closing the first nut and the second nut inside the sleeve. A screw is installed inside the split nut assembly and is coaxial with the split nut assembly. Rollers are installed between the outer wall of the screw and the inner wall of the split nut assembly. The screw, the rollers, and the split nut assembly are connected by thread fit. This utility model adopts a split nut assembly, and the nut can be processed separately outside the sleeve, greatly reducing the precision requirements in terms of process requirements.

[0004] However, when this structure is actually used, it is not convenient to add lubricating oil between the screw and the rollers, and it does not have a self-lubricating function. Therefore, it is impossible to reduce the friction force generated between the screw rod and the rollers. As a result, the screw rod and the rollers are prone to wear after long-term use, reducing the transmission accuracy and efficiency, and also reducing the service life of the screw. Therefore, a planetary roller screw with a self-lubricating function is now proposed. Summary of the Utility Model

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a planetary roller screw with a self-lubricating function to solve the problems raised in the above background art.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A planetary roller screw with self-lubricating function, including a screw rod body, the screw rod body is connected with a roller body in a mating manner, both ends of the roller body are connected with a mating plate, the mating plate is in rotational connection with the screw rod body, a sealing gasket is arranged outside the mating plate, a fixing plate is arranged outside the sealing gasket, the two mating plates are jointly connected with a housing, one end of the housing is provided with a fixing disk, an oil injection cylinder is installed at the top of the housing, and an oil receiving bottle is installed at the bottom of the housing.

[0007] Preferably, a threaded hole is provided in the middle of the mating plate, and the threaded hole is in spiral connection with the screw rod body.

[0008] Preferably, a plurality of first through holes are provided in a ring shape on the mating plate.

[0009] Preferably, a spiral groove is provided in a ring shape on the mating plate, and a second through hole corresponding to the spiral groove is provided in a ring shape on the fixing plate.

[0010] Preferably, a shaft hole is provided in the middle of the fixing plate, and positioning holes are provided in a ring shape on the fixing plate.

[0011] The technical effects and advantages of the present utility model:

[0012] 1. Through the rotational connection between the mating plate and the screw rod body, and the connection between the mating plate and the housing, each roller body is installed between the two mating plates. When the screw rod body is connected and cooperates with each roller body, and each roller body rotates, it can drive the screw rod body to perform telescopic rotation. And the screw rod body is in rotational connection with the mating plate, which can make the two mating plates seal the inside of the housing, and the outer sealing gasket seals the connection part of the roller body, thereby further improving the sealing effect. When lubricating oil is injected into the oil injection cylinder, it can enter the sealed housing, so as to lubricate the contact surface between the roller body and the screw rod body.

[0013] 2. By pre-injecting a certain amount of lubricating oil into the oil injection cylinder, when the lubricating oil in the housing decreases, the lubricating oil in the oil injection cylinder automatically drops into the housing, thereby realizing the self-lubricating function. And by observing the oil level in the oil injection cylinder, it can be judged whether lubricating oil needs to be added. At the same time, by disassembling the oil receiving bottle, the lubricating oil in the oil receiving bottle can be detected, which is convenient for judging the quality of the lubricating oil and whether it needs to be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 It is a schematic diagram of the connection structure between the mating plate and the housing of the present utility model.

[0016] Figure 3 This is a schematic cross-sectional view of the present utility model.

[0017] Figure 4 This is a schematic structural view of the mating plate of the present utility model.

[0018] Figure 5 This is a schematic structural view of the fixing plate of the present utility model.

[0019] The reference numerals are: 1, screw rod body; 2, outer shell; 3, fixed disk; 4, oil injection cylinder; 5, oil receiving bottle; 6, fixing plate; 7, mating plate; 8, sealing gasket; 9, roller body; 10, threaded hole; 12, first through hole; 13, thread groove; 14, shaft hole; 15, positioning hole; 16, second through hole. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] As shown in the attached Figures 1-5 A planetary roller screw with a self-lubricating function, including a screw rod body 1, the screw rod body 1 is connected with a roller body 9 in a mating manner, both ends of the roller body 9 are connected with a mating plate 7, the mating plate 7 is in screw connection and cooperation with the screw rod body 1, a sealing gasket 8 is arranged outside the mating plate 7, a fixing plate 6 is arranged outside the sealing gasket 8, the two mating plates 7 are jointly connected with an outer shell 2, a fixed disk 3 is arranged at one end of the outer shell 2, an oil injection cylinder 4 is installed at the top end of the outer shell 2, and an oil receiving bottle 5 is installed at the bottom end of the outer shell 2.

[0022] During specific implementation, the mating plate 7 is rotationally connected to the screw rod body 1, and the mating plate 7 is connected to the housing 2. Each roller body 9 is installed between the two mating plates 7. When the screw rod body 1 is connected and cooperates with each roller body 9, and each roller body 9 rotates, it can drive the screw rod body 1 to perform telescopic rotation. Since the screw rod body 1 is rotationally connected to the mating plate 7, the two mating plates 7 can seal the interior of the housing 2, and the outer sealing gasket 8 seals the connection of the roller bodies 9, thereby further improving the sealing effect. When lubricating oil is injected into the oil injection cylinder 4, it can enter the sealed housing 2, thereby lubricating the contact surface between the roller bodies 9 and the screw rod body 1. By pre-injecting a certain amount of lubricating oil into the oil injection cylinder 4, when the lubricating oil in the housing 2 decreases, the lubricating oil in the oil injection cylinder 4 automatically drops into the housing 2, thereby realizing the self-lubricating function. And by observing the oil level in the oil injection cylinder 4, it can be judged whether lubricating oil needs to be added. At the same time, by disassembling the oil collecting bottle 5, the lubricating oil in the inspection oil collecting bottle 5 can be detected, which is convenient for judging the quality of the lubricating oil and whether it needs to be replaced.

[0023] A threaded hole 10 is formed in the middle of the mating plate 7, and the threaded hole 10 is helically connected to the screw rod body 1 to facilitate improving the sealing performance of the connection between the screw rod body 1 and the mating plate 7.

[0024] A plurality of first through holes 12 are formed in a ring shape on the mating plate 7. The mating plate 7 is connected to the housing 2 by inserting a first stud through the first through holes 12 to facilitate fixing the connection between the mating plate 7 and the housing 2.

[0025] A spiral groove 13 is formed in a ring shape on the mating plate 7, and a second through hole 16 corresponding to the spiral groove 13 is formed in a ring shape on the fixing plate 6. The fixing plate 6 is connected to the spiral groove 13 by inserting a second stud through the second through hole 16, thereby crimping and fixing the sealing gasket 8 to further improve the sealing performance inside the housing 2.

[0026] A shaft hole 14 is formed in the middle of the fixing plate 6, and positioning holes 15 are formed in a ring shape on the fixing plate 6. By providing the positioning holes 15, the end of the first stud can be received, which also facilitates improving the pressing and fixing performance of the fixing plate 6 on the sealing gasket 8 and improving the sealing performance of the mating plate 7.

[0027] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A planetary roller screw with self-lubricating function, comprising a screw body (1), characterized in that: The screw body (1) is connected to a roller body (9), both ends of the roller body (9) are connected to matching plates (7), the matching plates (7) are screwed to the screw body (1), a sealing gasket (8) is arranged on the outside of the matching plate (7), a fixing plate (6) is arranged on the outside of the sealing gasket (8), the two matching plates (7) are connected to a housing (2), one end of the housing (2) is provided with a fixing plate (3), the top end of the housing (2) is equipped with an oil filling cylinder (4), and the bottom end of the housing (2) is equipped with an oil receiving bottle (5).

2. The planetary roller screw with self-lubricating function according to claim 1, characterized in that: A threaded hole (10) is provided in the middle of the matching plate (7), and the threaded hole (10) is spirally connected to the lead screw body (1).

3. The planetary roller screw with self-lubricating function according to claim 2, characterized in that: The matching plate (7) is provided with a plurality of first through holes (12) in an annular shape.

4. The planetary roller screw with self-lubricating function according to claim 3, characterized in that: The matching plate (7) is provided with a screw groove (13) in the shape of an annular ring, and the fixing plate (6) is provided with a second through hole (16) in the shape of an annular ring corresponding to the screw groove (13).

5. The planetary roller screw with self-lubricating function according to claim 4, characterized in that: An axial hole (14) is provided in the middle of the fixing plate (6), and a positioning hole (15) is provided in the shape of a ring on the fixing plate (6).

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