Planetary roller screw

Abstract

The utility model discloses a planetary roller lead screw, which relates to the technical field of lead screws, and comprises a middle lead screw pair and transmission lead screws, the outer side of the middle lead screw pair is connected with a nut in a penetrating manner, a driving mechanism is arranged in the nut, the driving mechanism is connected with the middle lead screw pair through a plurality of groups of transmission lead screws, and the transmission lead screws are connected with the middle lead screw pair. And a lubricating mechanism is arranged on the outer side of the nut and lubricates the interiors of the transmission lead screw and the nut, so that the situation that the meshing position of the transmission lead screw and the middle lead screw pair is blocked in the operation process of the nut and the transmission lead screw is avoided. In the using process, the nut in the rotating process drives the lubricating oil tank to conduct transposition at the same time, so that oil in the lubricating oil tank can be conveniently dropped into the transmission lead screw and the nut, and the situation that rotation and transposition are affected due to the fact that the dropping amount of lubricating oil is too small is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of screw rod, specifically relates to planetary roller screw. BACKGROUND

[0002] The planetary roller screw is a kind of transmission mechanism for converting rotary motion into linear motion, and its basic principle is to realize transmission by using the rolling friction of planetary roller, and in the planetary roller screw, planetary roller rolls along screw rod spiral groove, to convert rotary motion into linear motion.This transmission mode has the advantages of high precision, high rigidity and high efficiency.

[0003] The existing planetary roller screw does not have the function of conveniently adding lubricating oil when in use, so that excessive wear occurs in the use process, and then damage or jamming is prone to occur, so the existing planetary roller screw cannot meet the use requirement of people. SUMMARY

[0004] The utility model discloses a planetary roller screw to solve the above-mentioned defects caused in prior art.

[0005] The planetary roller screw includes a middle screw pair and a transmission screw, a nut is connected to the outer side of the middle screw pair, a driving mechanism is arranged in the nut, the driving mechanism is connected to the middle screw pair through a plurality of transmission screws, so that the position of the nut is dynamically adjusted, a lubricating mechanism is arranged on the outer side of the nut, the lubricating mechanism lubricates the transmission screw and the inside of the nut, so that the transmission screw and the middle screw pair are prevented from being jammed during operation.

[0006] Preferably, the driving mechanism includes a nut, an isolation disc, a groove, a planetary support, a transmission screw, a positioning hole and a planetary gear, the top end of the nut is connected to the isolation disc, the top end of the isolation disc is provided with the groove, the planetary support is arranged below the nut, the outer side of the planetary support is annularly provided with the positioning hole, the transmission screw is arranged above the positioning hole, and the top end of the transmission screw is connected to the planetary gear.

[0007] Preferably, the planetary support is connected to the bottom end of the transmission screw through the positioning hole arranged on the outer side.

[0008] Preferably, the nut is connected to the outer side of the middle screw pair through the transmission screw arranged annularly in the inside.

[0009] Preferably, the lubricating mechanism comprises a lubricating oil tank, a rubber plug, an alloy mesh cover, a liquid injection pipe and a double-sided adhesive tape, the top end of the lubricating oil tank is connected with the rubber plug, one side of the lubricating oil tank is connected with the alloy mesh cover, the other side of the alloy mesh cover is connected with the liquid injection pipe, one side of the liquid injection pipe is bolted with the lubricating oil tank, and the outer side of the lubricating oil tank is connected with the double-sided adhesive tape.

[0010] Preferably, the lubricating oil tank is connected with one side of the nut through the liquid injection pipe arranged on one side.

[0011] Preferably, the lubricating oil tank is connected with the outer side of the nut through the double-sided adhesive tape arranged on one side.

[0012] Compared with the prior art, the lubricating mechanism has the following advantages:

[0013] 1. During use, the lubricating oil tank is replaced by rotating the nut, so that the oil in the lubricating oil tank can be dropped into the transmission screw and the nut, thereby avoiding the influence of the small amount of lubricating oil on rotation and replacement, and the alloy mesh cover arranged on one side is used to cover the liquid injection pipe, thereby avoiding impurities from entering the lubricating oil tank during the backflow of the oil.

[0014] 2. The recess arranged on one side of the isolation disc is used for positioning the dust isolation pad, the dust isolation pad is used for isolating the top end of the screw pair and the nut, and the lubricating oil in the nut directly flows out, thereby avoiding dust from entering the screw pair in the nut. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole three-dimensional structure schematic view of the utility model.

[0016] Figure 2 It is a structure schematic view of the nut in the utility model.

[0017] Figure 3 It is a structure schematic view of the lubricating oil tank in the utility model.

[0018] Figure 4 It is a top view structure schematic view of the planet carrier in the utility model.

[0019] Figure 5 It is a structure schematic view of the lubricating oil tank and the nut in the utility model.

[0020] Among them:

[0021] 1, middle screw pair; 2, nut; 3, isolation disc; 4, groove; 5, planet support; 6, driving mechanism; 7, lubricating oil tank; 8, rubber plug; 9, lubricating mechanism; 10, alloy mesh cover; 11, liquid injection pipe; 12, double-sided adhesive tape; 13, transmission screw; 14, positioning hole; 15, planetary gear. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0023] As shown in the figure, the planetary roller screw includes a middle screw pair 1 and a transmission screw 13, and the outside of the middle screw pair 1 is connected through a nut 2, the inside of the nut 2 is provided with a driving mechanism 6, the driving mechanism 6 is connected with the middle screw pair 1 through multiple groups of transmission screws 13, thereby realizing dynamic adjustment of the position of the nut 2, the outside of the nut 2 is provided with a lubricating mechanism 9, the lubricating mechanism 9 lubricates the inside of the transmission screw 13 and the nut 2, thereby avoiding the situation that the transmission screw 13 and the middle screw pair 1 are stuck at the meshing position during operation of the nut 2 and the transmission screw 13. Figures 1 to 5 In the embodiment, the driving mechanism 6 includes the nut 2, the isolation disc 3, the groove 4, the planet support 5, the transmission screw 13, the positioning hole 14 and the planetary gear 15, the top end of the nut 2 is connected with the isolation disc 3, the top end of the isolation disc 3 is provided with the groove 4, the planet support 5 is arranged below the nut 2, the outside of the planet support 5 is annularly provided with the positioning hole 14, the transmission screw 13 is arranged above the positioning hole 14, and the top end of the transmission screw 13 is connected with the planetary gear 15.

[0024] In the embodiment, the planet support 5 is connected with the bottom end of the transmission screw 13 through the positioning hole 14 arranged on the outside, the bottom end of the transmission screw 13 is positioned through the positioning hole 14, and different numbers of transmission screws 13 are conveniently installed.

[0025] In the embodiment, the nut 2 is connected with the outside of the middle screw pair 1 through the transmission screw 13 arranged annularly in the inside, the middle screw pair 1 is meshed with the transmission screw 13, and the accuracy of displacement of the middle screw pair 1 is increased.

[0026] In the embodiment, the lubricating mechanism 9 includes the lubricating oil tank 7, the rubber plug 8, the alloy mesh cover 10, the liquid injection pipe 11 and the double-sided adhesive tape 12, the top end of the lubricating oil tank 7 is connected through the rubber plug 8, one side of the lubricating oil tank 7 is connected with the alloy mesh cover 10, the other side of the alloy mesh cover 10 is connected with the liquid injection pipe 11, one side of the liquid injection pipe 11 is bolted with the lubricating oil tank 7, and the outside of the lubricating oil tank 7 is connected with the double-sided adhesive tape 12.

[0027] ​

[0028] In the embodiment, the lubricating oil tank 7 is connected with one side of the nut 2 through the injection pipe 11 arranged on one side.

[0029] In the embodiment, the lubricating oil tank 7 is connected with the outer side of the nut 2 through the double-sided adhesive tape 12 arranged on one side, and the outer side of the lubricating oil tank 7 and the nut 2 is positioned through the double-sided adhesive tape 12, so that the lubricating oil tank 7 is positioned and disassembled conveniently.

[0030] The planetary roller screw in actual application includes the following working contents:

[0031] Step 1: The operator installs the sealing felt in the groove 4 arranged on the outer side of the isolation disc 3, positions the sealing felt by using the groove 4, the sealing felt can avoid the leakage of the lubricating oil in the nut 2, and also avoid the dust and the like in the outside from entering the inside of the nut 2, the operator installs the middle screw pair 1 in the inside of the nut 2, the nut 2 is provided with the planetary gear 15 at the end, the planetary gear 15 is coaxial with the nut 2, and the end planetary gear 15 of the transmission screw 13 is correctly engaged and meets the planetary motion law;

[0032] Step 2: When the transmission screw 13 is assembled, the plurality of transmission screws 13 are connected with the outer side of the planetary gear 15 through the positioning hole 14, then the transmission screw 13 is installed in the inside of the nut 2, and then the middle screw 1 is inserted through the through hole and engaged with the plurality of transmission screws 13;

[0033] Step 3: The planetary motion of the middle screw pair 1 and the transmission screw 13 is ensured by the mutually engaged planetary gears 15, the center of the transmission screw 13 passes through a spline shaft, the spline shaft is fixed with the planetary gear 15 and rotates with the transmission screw 13, but allows the transmission screw 13 to move axially along the middle screw pair 1. A plurality of transmission screws 13 arranged along the circumferential direction of the screw are divided by the end ring to ensure that the distribution position is correct. The distribution hole on the end ring passes through the center shaft and allows the center shaft to rotate freely;

[0034] Step 4: In the rotating process, the lubricating oil tank 7 is driven by the nut 2 to change position, the oil is injected into the inside of the nut 2 by using the injection pipe 11 arranged on one side of the lubricating oil tank 7, the middle screw pair 1, the nut 2 and the plurality of transmission screws 13 are lubricated by using the lubricating oil, and the impurities in the lubricating oil are filtered by using the alloy mesh cover 10 in the reflux process, so that the impurities are prevented from flowing into the inside of the lubricating oil tank 7.

[0035] Therefore, the above-mentioned disclosed embodiments are only examples and are not the only ones. All changes within the scope of the utility model or within the scope equivalent to the utility model are included in the utility model.

Claims

1. A planetary roller screw characterized by: The utility model provides a middle screw rod pair (1) and drive screw (13) including, the outside of middle screw rod pair (1) is connected with nut (2) through, the inside of nut (2) is provided with drive mechanism (6), drive mechanism (6) is connected with middle screw rod pair (1) through setting multiple groups of drive screw (13), and then the position of nut (2) is carried out dynamic adjustment, the outside of nut (2) is provided with lubricating mechanism (9), lubricating mechanism (9) carries out lubricating treatment to drive screw (13) and the inside of nut (2), and then avoids nut (2) and drive screw (13) in the running -in process, and the engagement of drive screw (13) and middle screw rod pair (1) occurs the situation of jamming.

2. A planetary roller screw as claimed in claim 1, characterized in that: The drive mechanism (6) includes nut (2), isolation disc (3), groove (4), planetary support (5), drive screw (13), positioning hole (14) and planetary gear (15), the top of nut (2) is connected with isolation disc (3), the top of isolation disc (3) is provided with groove (4), the lower of nut (2) is provided with planetary support (5), the outer side of planetary support (5) is annular and is provided with positioning hole (14), the upper of positioning hole (14) is provided with drive screw (13), the top of drive screw (13) is connected with planetary gear (15).

3. The planetary roller screw of claim 2, wherein: The planetary support (5) is connected with the bottom of drive screw (13) through the positioning hole (14) of the outer side.

4. The planetary roller screw of claim 2, wherein: The nut (2) is connected with the outside of middle screw rod pair (1) through the drive screw (13) of the inside annular setting.

5. The planetary roller screw of claim 1, wherein: The lubricating mechanism (9) includes lubricating oil tank (7), rubber plug (8), alloy mesh enclosure (10), liquid injection pipe (11), double-sided adhesive tape (12), the top of lubricating oil tank (7) is connected with rubber plug (8) through, one side of lubricating oil tank (7) is connected with alloy mesh enclosure (10), the other side of alloy mesh enclosure (10) is connected with liquid injection pipe (11), one side of liquid injection pipe (11) is bolted and connected with lubricating oil tank (7), the outside of lubricating oil tank (7) is connected with double-sided adhesive tape (12).

6. The planetary roller screw of claim 5, wherein: The lubricating oil tank (7) is connected with one side of nut (2) through the liquid injection pipe (11) of one side setting.

7. The planetary roller screw of claim 5, wherein: The lubricating oil tank (7) is connected with the outside of nut (2) through the double-sided adhesive tape (12) of one side setting.

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