Differential reverse planetary roller screw pair

Abstract

The utility model discloses a differential reverse type planetary roller lead screw pair, which comprises a nut, a lead screw, a plurality of planetary rollers and two retainers, the lead screw is arranged in the nut in a penetrating way, the plurality of planetary rollers are uniformly arranged on the outer circumference of the lead screw in a surrounding way, the two retainers are respectively arranged on two sides in the nut, and the two retainers are respectively arranged on the two sides in the nut. The two ends of the multiple planetary rollers are inserted into the retainer, an oil injection hole is formed in the nut, a storage block is fixedly connected into the oil injection hole, a storage groove is formed in the storage block, an oil suction block is arranged in the storage groove, a plurality of oil discharging holes communicated with the storage groove are formed in the bottom of the storage block, an elastic piece is arranged above the storage block, and the elastic piece is connected with the storage block through a connecting rod. According to the differential reverse type planetary roller lead screw pair, oil can be conveniently injected into the nut, the interior of the planetary roller lead screw is kept in a lubricating state, and the differential reverse type planetary roller lead screw pair is simple in overall structure and easy to operate and use.

Description

Technical Field

[0001] This utility model relates to the field of lead screw related products, specifically a differential reverse planetary roller lead screw pair. Background Technology

[0002] A lead screw is a mechanical device that can convert rotary motion into linear motion. Currently, there are two main types of high-efficiency lead screws: ball screws and planetary roller screws, with planetary roller screws receiving increasing attention. However, due to the helix angle, a tilting torque exists on the rollers. If not fixed circumferentially, the rollers will slip or even spin under the influence of this tilting torque, severely affecting the reliability and load-bearing capacity of the planetary roller screw. Furthermore, due to its complex structure, planetary roller screws are difficult to install and disassemble. The screw, rollers, and nut undergo prolonged high-speed motion, leading to wear on all components and reducing their service life and transmission efficiency, thus presenting inherent drawbacks. Utility Model Content

[0003] The purpose of this invention is to provide a differential reverse planetary roller screw pair to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a differential reverse planetary roller screw pair, comprising a nut, a screw, multiple planetary rollers, and two cages. The screw passes through the nut, and the multiple planetary rollers are evenly mounted around the outer circumference of the screw. The two cages are located on both sides inside the nut, and both ends of the multiple planetary rollers are inserted into the cages. The nut has an oil injection hole, and a storage block is fixedly connected to the oil injection hole. The storage block has a storage groove, and an oil-absorbing block is provided in the storage groove. The bottom of the storage block has multiple oil drain holes communicating with the storage groove. A spring is provided above the storage block, and a connecting rod is fixedly connected to the bottom of the spring. A pressing block is fixedly connected to the bottom of the connecting rod.

[0005] Preferably, the axis of the lead screw coincides with the axis of the nut.

[0006] Preferably, positioning blocks are fixedly connected to both ends of the spring sheet, and traction blocks are fixedly connected to the inner walls on both sides of the oil injection hole. The positioning blocks and traction blocks are connected by bolts.

[0007] Preferably, the spring is made of metal.

[0008] Preferably, the oil-absorbing block is made of sponge.

[0009] Preferably, the plurality of oil holes are equidistant from each other.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This differential reverse planetary roller screw pair facilitates the injection of oil into the nut, keeping the planetary roller screw internally lubricated. The overall structure is simple and easy to operate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a differential reverse planetary roller screw pair according to the present invention;

[0013] Figure 2 This is a schematic diagram of the oil injection hole of a differential reverse planetary roller screw pair according to the present invention.

[0014] Figure 3 This is an enlarged view of point A of a differential reverse planetary roller screw pair according to this utility model.

[0015] In the diagram: 1. Nut; 2. Lead screw; 3. Planetary roller; 4. Cage; 5. Oil injection hole; 6. Storage block; 7. Storage groove; 8. Oil suction block; 9. Oil drain hole; 10. Spring; 11. Connecting rod; 12. Pressing block; 13. Positioning block; 14. Traction block; 15. Bolt. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Please see Figure 1-3 This utility model provides an embodiment of a differential reverse planetary roller screw pair, including a nut 1, a screw 2, multiple planetary rollers 3, and two cages 4. The screw 2 passes through the nut 1, and the multiple planetary rollers 3 are evenly arranged around the outer circumference of the screw 2. The two cages 4 are located on both sides inside the nut 1, and both ends of the multiple planetary rollers 3 are inserted into the cages 4. The nut 1 is provided with an oil injection hole 5, and a storage block 6 is fixedly connected to the oil injection hole 5. The storage block 6 is provided with a storage groove 7, and an oil-absorbing block 8 is provided in the storage groove 7. The bottom of the storage block 6 is provided with a storage groove 7. The groove 7 is connected to multiple oil drain holes 9. A spring sheet 10 is provided above the storage block 6. A connecting rod 11 is fixed to the bottom of the spring sheet 10. A pressing block 12 is fixedly connected to the bottom of the connecting rod 11. Specifically, lubricating oil is injected into the oil suction block 8 through the oil injection hole 5 to make it saturated. When lubrication is needed, the spring sheet 10 is pressed down. At this time, the spring sheet 10 deforms and pushes the connecting rod 11 down. At the same time, the connecting rod 11 pushes the pressing block 12 to squeeze the oil suction block 8. The lubricating oil inside the oil suction block 8 drips through multiple oil drain holes 9 on the bottom of the support plate to achieve lubrication at the interlocking part of the inner wall.

[0020] In this embodiment, the axis of the lead screw 2 coincides with the axis of the nut 1; both ends of the spring piece 10 are fixedly connected to the positioning block 13, and both sides of the inner wall of the oil injection hole 5 are fixedly connected to the traction block 14. The positioning block 13 and the traction block 14 are connected by bolts 15. The bolts 15 are used to connect the positioning block 13 and the traction block 14, which facilitates the disassembly and assembly of the spring piece 10; the spring piece 10 is made of metal; the oil absorption block 8 is made of sponge; and the multiple oil holes 9 are equidistantly arranged.

[0021] Working principle: First, lubricating oil is injected into the oil suction block 8 through the oil injection hole 5 to make it fully saturated. Then, when lubrication is needed, the spring 10 is pressed down. At this time, the spring 10 deforms and pushes the connecting rod 11 down. At the same time, the connecting rod 11 pushes the pressing block 12 to squeeze the oil suction block 8. The lubricating oil inside the oil suction block 8 drips through multiple oil holes 9 on the bottom of the bearing plate to achieve lubrication at the interlocking part of the inner wall.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A differential reverse planetary roller screw pair, comprising a nut (1), a screw (2), a plurality of planetary rollers (3) and two cages (4), characterized in that: The lead screw (2) is inserted into the nut (1). Multiple planetary rollers (3) are evenly installed around the outer circumference of the lead screw (2). Two retainers (4) are located on both sides inside the nut (1). Both ends of the multiple planetary rollers (3) are inserted into the retainers (4). The nut (1) is provided with an oil injection hole (5). A storage block (6) is fixedly connected inside the oil injection hole (5). The storage block (6) is provided with a storage groove (7). An oil suction block (8) is provided inside the storage groove (7). Multiple oil drain holes (9) communicating with the storage groove (7) are provided at the bottom of the storage block (6). A spring piece (10) is provided above the storage block (6). A connecting rod (11) is fixedly connected to the bottom of the spring piece (10). A pressing block (12) is fixedly connected to the bottom of the connecting rod (11).

2. The differential reverse planetary roller screw pair according to claim 1, characterized in that: The axis of the lead screw (2) coincides with the axis of the nut (1).

3. A differential reverse planetary roller screw pair according to claim 1, characterized in that: Both ends of the spring sheet (10) are fixedly connected to positioning blocks (13), and both sides of the oil injection hole (5) are fixedly connected to traction blocks (14). The positioning blocks (13) and traction blocks (14) are connected by bolts (15).

4. A differential reverse planetary roller screw pair according to claim 1, characterized in that: The spring (10) is made of metal.

5. A differential reverse planetary roller screw pair according to claim 1, characterized in that: The oil-absorbing block (8) is made of sponge.

6. A differential reverse planetary roller screw pair according to claim 1, characterized in that: The multiple oil holes (9) are equidistant from each other.

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