Planetary roller screw with adjustable effective stroke

Abstract

The invention discloses an effective stroke adjustable planetary roller screw which comprises a middle screw connected with an external driving device, a nut seat and a plurality of roller bodies, outer gear rings are arranged at the two ends of each roller body, and a plurality of outer teeth are arranged on the surface of each outer gear ring; inner gear rings are arranged at the two ends of the inner side wall of the nut seat, and a plurality of inner teeth are arranged on the inner side faces of the inner gear rings. The inner teeth and the outer teeth are each of a herringbone structure, and a movable magnetic ring is arranged in each inner gear ring. A waveguide tube is arranged in the middle screw rod, and a magnetostriction sensitive part is arranged in the waveguide tube; the end portion of the waveguide tube is connected with an electron chamber. According to the planetary roller screw stroke control device, the precision of planetary roller screw stroke control can be improved, and the planetary roller screw stroke control device has the advantages of being long in service life, simple in structure, high in transmission rate, high in detection precision, convenient to overhaul, high in structural stability and good in lubricating effect.

Description

Technical Field

[0001] The invention relates to a planetary roller screw, in particular to a planetary roller screw with adjustable effective stroke. Background Art

[0002] A planetary roller screw is a device that converts rotational motion into linear motion. It mainly includes components such as an intermediate screw, a roller body, a gear ring, and a nut seat. Since the movement of the roller body between the gear ring and the intermediate screw is rolling friction, its transmission efficiency is higher than that of an ordinary ball screw. At present, many planetary roller screws are installed with limit switches at both ends to limit the movement of the nut seat at both ends when in use. However, when in use, the control of the movement stroke of the nut seat is not limited to the control of the two ends. In many cases, the specific stroke of the nut seat needs to be controlled. At this time, manual control is often used to manually control the rotation time of the intermediate screw to achieve the purpose of controlling the movement stroke of the nut seat. However, manual control will be affected by various factors, resulting in reduced control accuracy. Therefore, how to design a planetary roller screw with high-precision stroke control has become a problem that needs to be solved urgently. Summary of the invention

[0003] The object of the present invention is to provide a planetary roller screw with adjustable effective stroke. The present invention has the advantage of high stroke control accuracy.

[0004] The technical solution of the present invention is as follows: an effective stroke adjustable planetary roller screw, comprising an intermediate screw connected to an external driving device, a nut seat and a plurality of annular evenly distributed roller bodies arranged between the nut seat and the intermediate screw, both ends of the roller bodies are provided with external toothed rings, and a plurality of annular evenly distributed external teeth are arranged on the surface of each external toothed ring; both ends of the inner side wall of the nut seat are provided with internal toothed rings, and a plurality of annular evenly distributed internal teeth are arranged on the inner side surface of the internal toothed ring; the internal teeth and the external teeth are meshed with each other, and both the internal teeth and the external teeth are in a herringbone structure, and a movable magnetic ring is arranged in each internal toothed ring; a waveguide tube matched with the movable magnetic ring is arranged in the intermediate screw, and a magnetostrictive sensitive part is arranged in the waveguide tube; the end of the waveguide tube is connected to an electronic chamber for generating current pulses; the herringbone-shaped internal teeth and The two sets of oblique helical gears on the external teeth can ensure high-speed and smooth transmission between the roller body and the nut seat, thereby ensuring the transmission rate; and when not working, a certain position limit will be formed between the oblique teeth, thereby avoiding the phenomenon of the roller body falling out from between the nut seat and the intermediate screw rod, thereby ensuring the structural stability and not requiring additional limit rings, and the overall structure is simpler; the active magnetic ring on the inner gear ring cooperates with the waveguide tube to achieve the purpose of non-contact detection of the moving distance of the nut seat, thereby achieving precise control of the displacement of the nut seat, and compared with the contact-type nut seat movement displacement method, it can well reduce the wear caused by contact and extend the service life; and the setting of the two active magnetic rings can realize displacement detection at two locations, thereby improving the accuracy of detection.

[0005] In the aforementioned effective stroke adjustable planetary roller screw, a first thread segment is provided on the roller body between the two outer gear rings, and the rotation direction of the first thread segment is opposite to that of the outer teeth; a second thread segment matching the first thread segment is provided on the outer surface of the intermediate screw and the inner surface of the nut seat; the use of two opposite rotation directions can reduce the axial force exerted on the roller body during operation, thereby reducing the axial deformation of the roller body, thereby improving the transmission accuracy.

[0006] In the above-mentioned effective stroke adjustable planetary roller screw, the nut seat includes a left nut seat and a right nut seat, and a plurality of evenly distributed grooves are provided on the end face of the left nut seat facing the right nut seat; a positioning piece is vertically installed on the top end portion of the left nut seat facing the side of the right nut seat; a plurality of clamping blocks matching the grooves are provided on the end face of the right nut seat facing the left nut seat; a positioning piece is also vertically installed on the top end portion of the right nut seat facing the side of the left nut seat; two symmetrically distributed positioning grooves are provided on the top surface of the inner gear ring, and the positioning grooves match the positioning pieces; the left nut seat and the right nut seat are spliced ​​together by the clamping blocks and the grooves, so that the nut seat can be easily removed from the intermediate screw rod, which facilitates maintenance; positioning pieces are provided on both the left nut seat and the right nut seat, which cooperate with the positioning grooves provided on the inner gear ring to locate the installation positions of the left nut seat and the right nut seat, which facilitates assembly.

[0007] In the aforementioned effective stroke adjustable planetary roller screw, the left nut seat and the right nut seat are both provided with oil injection channels, and each oil injection channel is arranged in an inclined shape; the end portions of the oil injection channel located on the outer surfaces of the left nut seat and the right nut seat are arranged directly above the end portions of the oil injection channel located on the inner surfaces of the left nut seat and the right nut seat; arranging the oil injection channel in an inclined shape can avoid the phenomenon of lubricating oil flowing out during the lubrication process, thereby avoiding unnecessary waste of lubricating oil.

[0008] In the aforementioned effective stroke adjustable planetary roller screw, an annular groove is provided on the side of each of the blocks; a buffer pad is installed in each annular groove; the buffer pad can reduce the vibration generated by the entire nut seat during operation, thereby ensuring the stability of the operation.

[0009] In the aforementioned effective stroke adjustable planetary roller screw, an installation channel is provided at a position on the intermediate screw corresponding to the waveguide tube, and the opening of the installation channel is provided on the end face of the intermediate screw rod away from the external driving device; a plurality of annular evenly distributed shock-absorbing rings are provided on the inner side wall of the installation channel, and each shock-absorbing ring is sleeved on the waveguide tube; a sleeved limit ring is provided at the opening of the installation channel, and the limit ring is provided with an opening for clamping the waveguide tube; the shock-absorbing ring can avoid the vibration transmitted to the waveguide tube during the operation of the planetary roller screw, thereby avoiding damage to the waveguide tube caused by vibration as much as possible and extending the service life.

[0010] In the aforementioned effective stroke adjustable planetary roller screw, the limit ring is made of rubber material.

[0011] In the aforementioned effective stroke adjustable planetary roller screw, an oil storage chamber is provided in the outer gear ring, and the oil storage chamber is connected to a refueling hole arranged on the outer side surface of the outer gear ring; a sealing cover is threadedly installed on the refueling hole; the oil storage chamber is provided with annular evenly distributed flow channels, and the outlet of each flow channel is arranged on the surface of the outer teeth.

[0012] In the aforementioned effective stroke adjustable planetary roller screw, a plurality of evenly distributed blocking protrusions are provided on the inner side walls of the oil storage chamber and the flow channel; the blocking protrusions can be used to slow down the flow velocity of the internal lubricating oil, thereby better controlling the output of the lubricating oil and further improving the utilization rate of the lubricating oil.

[0013] Compared with the prior art, the present invention improves the existing planetary roller screw by providing herringbone-shaped external teeth and internal teeth on both the outer gear ring and the inner gear ring, and utilizing the meshing transmission between the herringbone-shaped internal teeth and the external teeth, so that the roller body and the nut seat can perform conversion between rotational motion and linear motion; and the herringbone-shaped external teeth and the internal teeth can form two sets of oblique helical gears, so that during the transmission process, one set of oblique teeth can offset the thrust of the other set of oblique teeth, thereby ensuring high-speed and stable transmission between the roller body and the nut seat, and ensuring the transmission rate; at the same time, because the herringbone-shaped internal teeth and the external teeth have two oblique directions, when not working, a certain position limitation will be formed between the oblique teeth, thereby avoiding the phenomenon that the roller body falls out from between the nut seat and the intermediate screw rod, thereby ensuring the structural stability and also making the entire planetary roller screw do not need to additionally set up a guide ring for fixing the roller body, thereby making the structure of the entire planetary roller screw simpler. At the same time, by arranging a movable magnetic ring on the inner gear ring, arranging a waveguide tube on the intermediate screw rod, and connecting a magnetostrictive sensitive component and an electronic chamber for generating current pulses on the waveguide tube, the movable magnetic ring, the waveguide tube and the magnetostrictive sensitive component can form a structure of a magnetostrictive displacement sensor. When the electronic chamber transmits a current pulse to the waveguide tube, a magnetic field is formed on the outside of the waveguide tube under the action of the magnetostrictive sensitive component. As the movable magnetic ring moves with the nut seat, a phenomenon of magnetic field intersection occurs, and then the magnetostrictive sensitive component in the waveguide tube generates a pulse signal, thereby achieving the purpose of non-contact detection of the movement distance of the nut seat, and then achieving precise control of the displacement of the nut seat. Compared with the contact-type nut seat movement displacement method, the wear caused by contact can be well reduced, and the service life is extended. Moreover, because there are two inner gear rings, that is, there are two detection points, the accuracy of the nut seat movement displacement detection can be improved.In addition, the present invention also provides a first thread segment on the roller body, and sets the rotation direction of the first thread segment to be opposite to the rotation direction of the external teeth. The two opposite rotation directions can reduce the axial force on the roller body during operation, thereby reducing the axial deformation of the roller body, thereby improving the transmission accuracy; the nut seat is arranged to be composed of a left nut seat and a right nut seat, and the left nut seat and the right nut seat are spliced ​​together by a clamping block and a clamping groove, so that the nut seat can be easily removed from the intermediate screw rod, which facilitates maintenance; positioning pieces are provided on both the left nut seat and the right nut seat, and cooperate with the positioning grooves provided on the inner gear ring, so that the left nut seat and the right nut seat can be installed The positioning is convenient for assembly, and the tightness of the connection between the left nut seat and the right nut seat and the inner gear ring can be increased, thereby ensuring the stability of the structure; by providing oil injection channels on both the left nut seat and the right nut seat, the oil injection channels can be used to facilitate lubrication between the roller body and the nut seat and between the roller body and the screw rod from the outside, thereby facilitating use; and by setting the oil injection channels in an inclined shape, the phenomenon of lubricating oil flowing out during lubrication can be avoided, thereby avoiding unnecessary waste of lubricating oil; by sleeve-connecting a buffer pad on the clamping block, the buffer pad can be used to reduce the vibration of the entire nut seat during operation, thereby ensuring the stability of the operation; An installation channel is provided on the intermediate screw rod, and a plurality of shock-absorbing rings are arranged in the installation channel. The shock-absorbing ring can avoid the vibration transmitted to the waveguide during the operation of the planetary roller screw, thereby avoiding damage to the waveguide due to vibration as much as possible and extending the service life; the shock-absorbing ring can fix the position of the waveguide to a certain extent, and cooperate with the limit ring arranged at the opening of the installation channel. The limit ring can further fix the position of the waveguide to ensure the stability of the structure; the limit ring is made of rubber material, so that the limit ring has a certain deformation ability, thereby facilitating the separation of the limit ring from the waveguide and facilitating subsequent maintenance work; through the outer gear ring An oil storage chamber is provided on the upper surface, which cooperates with the flow channel arranged in the middle of the outer tooth surface, so that the outer tooth ring can autonomously lubricate the outer teeth and inner teeth during operation, further extending the service life; and the outlet of the flow channel is arranged in the middle of the outer tooth side surface, which cooperates with the herringbone shape of the outer teeth, so that the lubricating oil can flow well to various positions on the outer tooth and inner tooth surface, ensuring the lubrication effect; by arranging a plurality of evenly distributed blocking protrusions on the inner side wall of the oil storage chamber and the flow channel, the blocking protrusions can be used to slow down the flow speed of the internal lubricating oil, so that the amount of lubricating oil can be better controlled, and the utilization rate of the lubricating oil is further improved. Therefore, the present invention can not only improve the accuracy of the stroke control of the planetary roller screw, but also has the advantages of long service life, simple structure, high transmission rate, high detection accuracy, convenient maintenance, high structural stability and good lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the nut seat;

[0016] Figure 3 It is a schematic diagram of the structure of the outer gear ring;

[0017] Figure 4 is a top view of the outer gear ring;

[0018] Figure 5 It is a schematic diagram of the structure of the internal gear ring;

[0019] Figure 6 yes Figure 1 A partial enlarged view of point A in the middle.

[0020] The markings in the attached drawings are: 1-intermediate screw, 2-nut seat, 3-roller body, 4-external gear ring, 5-external teeth, 6-internal gear ring, 7-internal teeth, 9-movable magnetic ring, 10-waveguide tube, 11-left nut seat, 12-right nut seat, 13-slot, 14-positioning piece, 15-block, 16-positioning slot, 17-oil filling channel, 18-buffer pad, 19-shock absorber ring, 20-limiting ring, 21-oil storage chamber, 22-fuel filling hole, 23-sealing cover. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0022] Embodiment. An effective stroke adjustable planetary roller screw is constructed as follows Figures 1 to 6 As shown, it includes an intermediate screw 1 connected to an external driving device, a nut seat 2 and a plurality of annularly evenly distributed roller bodies 3 arranged between the nut seat 2 and the intermediate screw 1, both ends of the roller body 3 are provided with external tooth rings 4, and a plurality of annularly evenly distributed external teeth 5 are arranged on the surface of each external tooth ring 4; both ends of the inner side wall of the nut seat 2 are provided with internal tooth rings 6, and a plurality of annularly evenly distributed internal teeth 7 are arranged on the inner side surface of the internal tooth ring 6; the internal teeth 7 are meshed with the external teeth 5, and the internal teeth 7 and the external teeth 5 are both in a herringbone structure, and a movable magnetic ring 9 is arranged in each inner tooth ring 6; a waveguide 10 matched with the movable magnetic ring 9 is arranged in the intermediate screw 1, and a magnetostrictive sensitive part is arranged in the waveguide 10; the end of the waveguide 10 is connected to an electronic chamber for generating current pulses.

[0023] A first thread segment is provided between the two outer tooth rings 4 and is located on the roller body 3. The rotation direction of the first thread segment is opposite to that of the outer teeth 5. A second thread segment matching the first thread segment is provided on the outer surface of the intermediate screw rod 1 and the inner surface of the nut seat 2. The nut seat 2 includes a left nut seat 11 and a right nut seat 12. A plurality of evenly distributed grooves 13 are provided on the end surface of the left nut seat 11 facing the right nut seat 12. A positioning member 14 is vertically installed on the top end of the left nut seat 11 facing the side of the right nut seat 12. The right nut seat 1 2, a plurality of blocks 15 are provided on the end surface of the left nut seat 11 on the upper side thereof, which are matched with the grooves 13; a positioning member 14 is also vertically installed on the top end of the right nut seat 12 on the side surface of the left nut seat 11; two symmetrically distributed positioning grooves 16 are provided on the top surface of the inner gear ring 6, and the positioning grooves 16 are matched with the positioning member 14; an oil injection channel 17 is provided on each of the left nut seat 11 and the right nut seat 12, and each oil injection channel 17 is arranged in an inclined shape; the ends of the oil injection channel 17 located on the outer surfaces of the left nut seat 11 and the right nut seat 12 are arranged on the injection The oil passage 17 is located just above the ends on the inner side surfaces of the left nut seat 11 and the right nut seat 12; an annular groove is provided on the side surface of each of the clamping blocks 15; a buffer pad 18 is installed in each annular groove; a mounting passage is provided at a position on the intermediate screw rod 1 corresponding to the waveguide 10, and the opening of the mounting passage is provided on the end surface of the intermediate screw rod 1 away from the external driving device; a plurality of annular evenly distributed shock-absorbing rings 19 are provided on the inner side wall of the mounting passage, and each shock-absorbing ring 19 is sleeved on the waveguide 10; a A limit ring 20 is sleeved, and an opening is provided on the limit ring 20 for clamping the waveguide 10; the limit ring 20 is made of rubber material; an oil storage chamber 21 is provided in the outer gear ring 4, and the oil storage chamber 21 is connected to a refueling hole 22 arranged on the outer surface of the outer gear ring 4; a sealing cover 23 is threadedly installed on the refueling hole 22; the oil storage chamber 21 is provided with an annular evenly distributed flow channel, and the outlet of each flow channel is arranged on the surface of the outer tooth 5; a plurality of evenly distributed blocking protrusions are provided on the oil storage chamber 21 and the inner wall of the flow channel.

[0024] Working principle: When working, an external driving device (such as a servo motor) is used to drive the intermediate screw 1 to rotate. During the rotation of the intermediate screw 1, the second thread segment and the first thread segment on the roller body 3 will be meshed and transmitted, so that the roller body 3 will rotate. During the rotation of the roller body 3, the outer gear ring 4 will be driven to rotate. During the rotation of the outer gear ring 4, the outer teeth 5 will be driven to rotate. The outer teeth 5 are meshed and connected with the inner teeth 7, so that the meshing transmission between the inner teeth 7 and the outer teeth 5 can convert the rotational motion of the roller body 3 into a linear motion at the nut seat 2, which in turn enables the nut seat 2 to perform a linear motion along the intermediate screw 1; because the inner teeth Ring 6 is installed on the inner wall of nut seat 2, so the inner gear ring 6 will perform linear motion with nut seat 2, and the inner gear ring 6 will drive the internal movable magnetic ring 9 to move during the movement; because when the entire planetary roller screw is connected to the external mains, the electronic chamber connected to the waveguide 10 will generate current pulses, because the waveguide 10 is provided with a magnetostrictive sensitive component, the magnetostrictive sensitive component is used to enable the current pulse to be conducted in the waveguide 10, thereby forming a magnetic field on the outside of the waveguide 10; when the movable magnetic ring 9 moves along the intermediate screw 1, the magnetic field of the movable magnetic ring 9 will intersect with the magnetic field on the outside of the waveguide 10. At this time, as the magnetic field changes, the waveguide 1 0 will generate a pulse signal to the external controller, so that the external controller can detect the movement of the nut seat in real time, thereby achieving the purpose of non-contact detection of the movement distance of the nut seat, and then achieving precise control of the displacement of the nut seat; at the same time, in the process of transmission between the outer teeth 5 and the inner teeth 7, because the inner teeth 7 and the outer teeth 5 are both in a herringbone structure, two groups of oblique helical gears will be formed on the inner teeth 7 and the outer teeth 5. During the transmission process, one group of oblique teeth can offset the thrust of the other group of oblique teeth, thereby ensuring high-speed and stable transmission between the roller body and the nut seat, and ensuring the transmission rate; at the same time, because the herringbone structure The inner teeth 7 and the outer teeth 5 have two oblique directions, so that when not working, a certain position limit is formed between the oblique teeth, which prevents the roller body 3 from falling out from between the nut seat 2 and the intermediate screw rod 1. While ensuring the structural stability, the entire planetary roller screw does not need to be additionally provided with a guide ring for fixing the roller body, thereby making the structure of the entire planetary roller screw simpler; at the same time, a first thread segment is provided on the roller body 3, and the rotation direction of the first thread segment is set to be opposite to the rotation direction of the outer teeth 5. The two opposite rotation directions can reduce the axial force on the roller body 3 during operation, thereby reducing the axial deformation of the roller body 3, thereby improving the transmission accuracy;When it is necessary to repair the roller body 3 or replace the nut seat 2, it is only necessary to use external force to pull the left nut seat 11 and the right nut seat 12 to move in opposite directions, so that the clamping block 15 is separated from the clamping groove 13. When the left nut seat 11 and the right nut seat 12 are away from each other at a certain distance, they are moved upwards for a certain distance, so that the positioning pieces 14 on the left nut seat 11 and the right nut seat 12 are separated from the positioning groove 16. The left nut seat 11 and the right nut seat 12 can then be removed from the intermediate screw rod 1 for repair. In the course of work, in order to reduce the friction coefficient between the various components, lubrication work is required. At this time, the oil filling channel 17 can be used to fill the nut seat 2 and the roller body with oil. 3, so as to perform lubrication work; at the same time, a certain amount of lubricating oil is added to the oil storage chamber 21 on the outer gear ring 4 through the filling hole 22, and then the sealing cover 23 blocks the filling hole 22. When the outer gear ring 4 rotates with the roller body 3, it will drive the oil storage chamber 21 to rotate, and the lubricating oil in the oil storage chamber 21 will flow to the surface of the outer teeth 5 through the flow channel under the action of gravity. Because the outer teeth 5 are meshed with the inner teeth 7, and the outer teeth 5 and the inner teeth 7 have a herringbone structure, the lubricating oil flowing to the surface of the outer teeth 5 will flow to both sides under the action of extrusion, thereby achieving comprehensive lubrication of the surfaces of the inner teeth 7 and the outer teeth 5. ;

Claims

1. A planetary roller screw with adjustable effective stroke, comprising an intermediate screw (1) connected to an external driving device, a nut seat (2), and a plurality of annular roller bodies (3) evenly distributed between the nut seat (2) and the intermediate screw (1), characterized in that: Both ends of the roller body (3) are provided with external toothed rings (4), and the surface of each external toothed ring (4) is provided with a plurality of external teeth (5) evenly distributed in an annular shape; both ends of the inner side wall of the nut seat (2) are provided with internal toothed rings (6), and the inner side surface of the internal toothed ring (6) is provided with a plurality of internal teeth (7) evenly distributed in an annular shape; the internal teeth (7) and the external teeth (5) are meshed with each other, and both the internal teeth (7) and the external teeth (5) are in a herringbone structure, and each internal toothed ring (6) is provided with a movable magnetic ring (9); a waveguide (10) matched with the movable magnetic ring (9) is provided inside the intermediate screw rod (1), and a magnetostrictive sensitive component is provided inside the waveguide (10); and the end of the waveguide (10) is connected to an electronic chamber for generating current pulses.

2. The effective stroke adjustable planetary roller screw according to claim 1, characterized in that: A first thread segment is provided between the two outer tooth rings (4) and is located on the roller body (3). The rotation direction of the first thread segment is opposite to that of the outer teeth (5). A second thread segment matching the first thread segment is provided on the outer surface of the intermediate screw rod (1) and the inner surface of the nut seat (2).

3. The effective stroke adjustable planetary roller screw according to claim 1, characterized in that: The nut seat (2) comprises a left nut seat (11) and a right nut seat (12); a plurality of evenly distributed slots (13) are arranged on the end surface of the left nut seat (11) facing the right nut seat (12); a positioning piece (14) is vertically installed on the top end of the left nut seat (11) facing the side of the right nut seat (12); a plurality of clamping blocks (15) matching with the slots (13) are arranged on the end surface of the right nut seat (12) facing the left nut seat (11); a positioning piece (14) is also vertically installed on the top end of the right nut seat (12) facing the side of the left nut seat (11); and two symmetrically distributed positioning slots (16) are arranged on the top surface of the inner gear ring (6), and the positioning slots (16) match with the positioning piece (14).

4. The effective stroke adjustable planetary roller screw according to claim 3, characterized in that: The left nut seat (11) and the right nut seat (12) are both provided with oil injection channels (17), and each oil injection channel (17) is arranged in an inclined shape; the end portions of the oil injection channels (17) located on the outer sides of the left nut seat (11) and the right nut seat (12) are arranged directly above the end portions of the oil injection channels (17) located on the inner sides of the left nut seat (11) and the right nut seat (12).

5. The effective stroke adjustable planetary roller screw according to claim 3, characterized in that: An annular groove is provided on the side surface of each of the clamping blocks (15); and a buffer pad (18) is installed in each annular groove.

6. The effective stroke adjustable planetary roller screw according to claim 1, characterized in that: A mounting channel is provided at a position on the intermediate screw rod (1) corresponding to the waveguide tube (10), and an opening of the mounting channel is provided on an end face of the intermediate screw rod (1) away from an external driving device; a plurality of annularly evenly distributed shock absorbing rings (19) are provided on the inner side wall of the mounting channel, and each shock absorbing ring (19) is sleeved on the waveguide tube (10); a sleeved limiting ring (20) is provided at the opening of the mounting channel, and an opening for inserting the waveguide tube (10) is provided on the limiting ring (20).

7. The effective stroke adjustable planetary roller screw according to claim 6, characterized in that: The limiting ring (20) is made of rubber material.

8. The effective stroke adjustable planetary roller screw according to any one of claims 1 to 7, characterized in that: The outer gear ring (4) is provided with an oil storage chamber (21), and the oil storage chamber (21) is connected to a refueling hole (22) arranged on the outer side surface of the outer gear ring (4); a sealing cover (23) is threadedly mounted on the refueling hole (22); the oil storage chamber (21) is provided with annular evenly distributed flow channels, and the outlet of each flow channel is arranged on the surface of the outer tooth (5).

9. The effective stroke adjustable planetary roller screw according to claim 8, characterized in that: The oil storage cavity (21) and the inner side wall of the flow channel are provided with a plurality of evenly distributed blocking protrusions.

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