Self-locking planetary roller screw

Abstract

The utility model discloses a self-locking planetary roller screw, which comprises a middle screw (1), a nut seat (2) and a plurality of roller bodies (3), two symmetrically distributed inner gear rings (4) are arranged on the inner side wall of the nut seat (2), and a plurality of annular and uniformly distributed inner teeth (5) are arranged on the inner side wall of each inner gear ring (4); a locking piece (6) is arranged between every two adjacent inner teeth (5), and each locking piece (6) is installed in the inner gear ring (4) in a sliding mode. Each locking piece (6) is connected with a driving device; outer gear rings (7) are installed at the two ends of the roller body (3), a plurality of outer teeth (8) are arranged on the outer gear rings (7), and the outer teeth (8) are connected with the inner teeth (5) in a meshed mode. The self-locking device not only can improve the self-locking effect, but also has the advantages of being convenient to use, high in structural stability and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of planetary ball screw, in particular to self-locking planetary roller screw. BACKGROUND

[0002] Planetary roller screw is a kind of transmission component for converting rotary motion into linear motion, with high running speed, strong carrying capacity, good environmental adaptability and long service life, wide application prospect;Existing planetary roller screw mainly includes intermediate screw, nut seat and a plurality of roller body etc. Specific components, although there is a certain pre-tightening force between nut seat and intermediate screw when assembling planetary roller screw to avoid the phenomenon that roller body and nut seat slip;But after long time use, the pre-tightening force between nut seat and intermediate screw will be reduced, and then the frequency of the phenomenon that roller body and nut seat slip increases, so that the self-locking ability of the whole planetary roller screw decreases.Therefore, the existing planetary roller screw will have the problem of poor self-locking effect after long time use. SUMMARY

[0003] The utility model aims at providing a kind of self-locking planetary roller screw.The utility model has the advantages of good self-locking effect.

[0004] The technical scheme of the utility model: self-locking planetary roller screw, including intermediate screw, nut seat and a plurality of evenly distributed roller bodies arranged between intermediate screw and nut seat, the inner side wall of nut seat is provided with two symmetrical distribution inner gear rings, the inner side wall of each inner gear ring is provided with a plurality of annular evenly distributed inner teeth, a locking member is arranged between each adjacent two inner teeth, each locking member is slidably installed in the inner gear ring, each locking member is connected with driving device for driving locking member to move, and the driving device is arranged in the inner gear ring, the both ends of roller body are provided with outer gear rings, the outer gear ring is provided with a plurality of annular evenly distributed outer teeth, and the outer teeth are meshed with inner teeth;Locking member can be moved between inner teeth and outer teeth by driving device, so as to limit whether inner teeth and outer teeth can be meshed and driven, so as to achieve the purpose of locking the position of nut seat;And locking member is provided with a plurality of, can realize multi-point limitation, and ensure the stability of locking.

[0005] In the foregoing self-locking planetary roller screw, the driving device includes electromagnet arranged in the inner gear ring and iron block arranged at the end of the locking member;The position corresponding to the electromagnet in the inner gear ring is provided with annular cavity, and the bottom surface of the annular cavity is communicated with a plurality of annular evenly distributed channels;The locking member is slidably installed in the channel;By being provided with annular cavity and channel in the inner gear ring, electromagnet, locking member and the movement of locking member are fixed and guided, so as to ensure the stability of locking member movement.

[0006] In the foregoing self-locking planetary roller screw, the length of the iron block is greater than the diameter of the channel; the length of the iron block is set to be greater than the diameter of the channel, so that the iron block can not only cooperate with the electromagnet but also be limited at the end of the locking piece, avoiding the phenomenon of the locking piece falling out of the annular cavity, and ensuring the stability of use.

[0007] In the foregoing self-locking planetary roller screw, the length of the iron block is greater than the diameter of the channel; the length of the iron block is set to be greater than the diameter of the channel, so that the iron block can not only cooperate with the electromagnet but also be limited at the end of the locking piece, avoiding the phenomenon of the locking piece falling out of the annular cavity, and ensuring the stability of use.

[0008] In the foregoing self-locking planetary roller screw, the length of the iron block is greater than the diameter of the channel; the length of the iron block is set to be greater than the diameter of the channel, so that the iron block can not only cooperate with the electromagnet but also be limited at the end of the locking piece, avoiding the phenomenon of the locking piece falling out of the annular cavity, and ensuring the stability of use.

[0009] Compared with the prior art, the utility model improves the existing planetary roller screw, through setting up locking piece and drive arrangement for driving locking piece movement on the inner tooth ring, when the intermediate screw stops and locking nut seat position is needed, only need to control drive arrangement start, make drive arrangement push locking piece move from inner tooth ring to between two inner tooth, so that the end of locking piece moves to between two inner tooth, locking piece can be stuck between inner tooth and outer tooth, further make inner tooth and outer tooth can't mesh transmission, realize the purpose of locking nut seat position, when need to unlock, only need to drive locking piece from between two inner tooth back to inner tooth ring through drive arrangement, make inner tooth and outer tooth can mesh transmission again, complete the purpose of unlocking, because locking piece sets up a plurality of, can guarantee locking inner tooth and outer tooth in many points, guarantee the self locking effect, also use very convenient. Moreover, the utility model discloses still be equipped with annular cavity and passageway in the inner tooth ring, be used for fixing electromagnet, locking piece and the movement of locking piece is oriented, guarantee the stability of locking piece movement, the length of iron block is set to be greater than the diameter of passageway, make iron block not only can cooperate with electromagnet but also can be positioned at the end of locking piece, avoid the phenomenon that locking piece falls out from annular cavity, guarantee the stability of use, be equipped with guide ring on the one side of inner tooth ring, the end of roller body is rotatably installed on the guide ring, can fix the position of roller body, guarantee the stability of structure, be equipped with a plurality of annular uniform distribution oil injection hole on the surface of nut seat, lubricating oil can be injected between nut seat and intermediate screw through oil injection hole, thereby reduce the friction between roller body and intermediate screw and the friction between inner tooth and outer tooth, prolong the service life. Therefore, the utility model not only can improve the self locking effect, also has convenient to use, the advantages such as high structural stability and long service life. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the structure schematic diagram of the utility model;

[0011] Figure 2 It is the internal structure side view of the utility model;

[0012] Figure 3 It is Figure 2 The local enlarged view of middle A.

[0013] The mark in the drawing is: 1-intermediate screw, 2-nut seat, 3-roller body, 4-inner tooth ring, 5-inner tooth, 6-locking piece, 7-outer tooth ring, 8-outer tooth, 9-electromagnet, 10-iron block, 11-annular cavity, 12-passageway, 14-guide ring, 15-oil injection hole. DETAILED DESCRIPTION

[0014] The utility model will be further explained in connection with the drawings and examples below, but not as the basis for limiting the utility model.

[0015] Embodiment. Self-locking planetary roller screw, constitute as Figures 1 to 3 As shown, including intermediate screw rod 1, nut seat 2 and be provided with between intermediate screw rod 1 and nut seat 2 multiple even distribution roller body 3, the inner side wall of nut seat 2 is provided with two symmetrical distribution inner gear ring 4, the inner side wall of each inner gear ring 4 is equipped with multiple annular even distribution inner tooth 5;Between every adjacent two inner tooth 5 are provided with locking piece 6, and each locking piece 6 is slidably installed in inner gear ring 4;Each locking piece 6 is connected with the drive device for driving locking piece 6 to move, and the drive device is arranged in inner gear ring 4;The both ends of roller body 3 are equipped with outer gear ring 7, and outer gear ring 7 is provided with multiple annular even distribution outer tooth 8, and outer tooth 8 is engagedly connected with inner tooth 5.

[0016] The drive device includes electromagnet 9 arranged in inner gear ring 4 and iron block 10 arranged at the end of locking piece 6;The position corresponding to electromagnet 9 in inner gear ring 4 is provided with annular cavity 11, and the bottom surface of annular cavity 11 is communicated with multiple annular even distribution channels 12;The locking piece 6 is slidably installed in channel 12;The length of iron block 10 is greater than the diameter of channel 12;Every inner gear ring 4 is provided with guide ring 14 away from the side of roller body 3, and guide ring 14 is provided with multiple annular even distribution through holes;The end of roller body 3 is installed in the through hole;The nut seat 2 is provided with multiple annular even distribution oil injection holes 15.

[0017] Working principle: in normal work, first of all, the whole planetary roller screw is connected to the external power supply, and then the external power supply is controlled to energize the electromagnet 9. After the electromagnet 9 is energized, a magnetic field is generated around the electromagnet. The magnetic field and the iron block 10 on the locking piece 6 cooperate with each other, so that the locking piece 6 can be stably attracted on the electromagnet 9, so that the locking piece 6 is located in the inner tooth ring 4, and the inner tooth 5 and the outer tooth 8 are stably engaged and transmitted. When the planetary roller screw stops working, in order to avoid the phenomenon that the moving precision is reduced due to the slipping phenomenon between the nut seat 2 and the roller body 3, the locking piece 6 needs to be self-locked between the nut seat 2 and the roller body 3. At this time, only the electromagnet 9 needs to be controlled to be de-energized. After the electromagnet 9 is de-energized, the magnetic field around it will disappear. At this time, the attraction between the iron block 10 and the electromagnet 9 will disappear, so that the locking piece 6 moves along the channel 12 to the outside of the inner tooth ring 4 under the action of its own gravity, so that the locking piece 6 enters between every two adjacent inner tooth 5. At this time, the locking piece 6 will block between the inner tooth 5 and the outer tooth 8 engaged transmission, so that the inner tooth 5 and the outer tooth 8 no longer engage transmission, so as to achieve the locking work of the movement of the roller body 3 and the nut seat 2, and realize the purpose of stable self-locking.

Claims

1. Self-locking planetary roller screw comprising a central spindle (1), a nut seat (2) and a plurality of uniformly distributed roller bodies (3) arranged between the central spindle (1) and the nut seat (2), characterized in that: The inner side wall of the nut seat (2) is provided with two symmetrical inner gear rings (4), the inner side wall of each inner gear ring (4) is provided with a plurality of annular uniform inner teeth (5), a locking piece (6) is arranged between each two adjacent inner teeth (5), each locking piece (6) is slidingly installed in the inner gear ring (4), each locking piece (6) is connected with a driving device for driving the locking piece (6) to move, the driving device is arranged in the inner gear ring (4), and the both ends of the roller body (3) are provided with outer gear rings (7), the outer gear rings (7) are provided with a plurality of annular uniform outer teeth (8), and the outer teeth (8) are meshed with the inner teeth (5).

2. Self-locking planetary roller screw according to claim 1, characterized in that The driving device comprises an electromagnet (9) arranged in the inner gear ring (4) and an iron block (10) arranged at the end of the locking piece (6), the inner gear ring (4) is provided with an annular cavity (11) at the position corresponding to the electromagnet (9), the bottom surface of the annular cavity (11) is communicated with a plurality of annular uniform distribution channels (12), and the locking piece (6) is slidingly installed in the channel (12).

3. Self-locking planetary roller screw according to claim 2, characterized in that: The length of the iron block (10) is greater than the diameter of the channel (12).

4. Self-locking planetary roller screw according to claim 1, characterized in that: Each inner gear ring (4) is provided with a guide ring (14) away from the roller body (3) on one side, the guide ring (14) is provided with a plurality of annular uniform distribution through holes, and the end of the roller body (3) is installed in the through hole.

5. Self-locking planetary roller screw according to any one of claims 1 to 4, characterized in that: The nut seat (2) is provided with a plurality of annular uniform distribution oil injection holes (15).

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