High-bearing-capacity driver based on reverse planetary roller screw rod

Abstract

The utility model discloses a high-bearing-capacity driver based on a reverse planetary roller lead screw, and relates to the technical field of lead screw driving. Comprising a positioning plate and a mounting plate, a bearing seat and a driving motor are mounted on the side, away from the mounting plate, of the positioning plate, a rotating shaft is rotationally mounted in the bearing seat through a bearing, the rotating shaft penetrates out of the positioning plate and is integrally provided with a lead screw gear, and the output end of the driving motor penetrates out of the positioning plate towards one side of the mounting plate and is fixedly provided with a driving gear meshed with the lead screw gear; a reverse planetary roller screw pair is arranged between the screw gear and the mounting plate, one end of a nut of the reverse planetary roller screw pair is fixedly connected with the screw gear in a sealed mode, and the other end of the nut is rotationally connected with the mounting plate. The planetary roller bearing is adopted to replace a common bearing in the prior art, the reverse planetary roller screw pair and the mounting plate are rotationally connected through the roller bearing, the axial stress area can be effectively increased through the rollers in the roller bearing, the roller density can be increased, and the axial bearing capacity can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a screw rod drive technical field, concretely is a high bearing driver based on reverse type planetary roller screw. BACKGROUND

[0002] The press machine is a kind of pressure processing equipment for the forming processing of blank, is widely used in punching, bending, stretching and extrusion processes, and can directly generate finished product or semi-finished product.

[0003] The driving structure of prior art press machine is like the public number CN109849398A disclosed a kind of pitch arbitrarily adjustable screw servo press machine, including planetary roller screw pair, planetary roller screw pair is directly fixed and installed through ordinary bearing, and bearing bears larger axial load in heavy load pressurizing process, ordinary axial thrust bearing is used in heavy load situation, then it needs to improve radial and axial dimension or arrangement multiple, make the overall volume of product larger, more cumbersome, in addition, temperature rises between transmission parts in heavy load pressurizing process, and easily produce wear and form metal dust, reduce product service life. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of high bearing driver based on reverse type planetary roller screw, can effectively solve the problems in background art.

[0005] The technical scheme for realizing the above-mentioned purpose is: a kind of high bearing driver based on reverse type planetary roller screw, characterized by: including parallel interval arrangement's locating plate and mounting plate, locating plate is installed with bearing seat and drive motor on the side away from mounting plate, bearing seat is rotatably installed with shaft in bearing, shaft is towards the side of mounting plate and is integrally provided with screw gear and is fixed with driving gear meshing with screw gear on the output side of drive motor and the side of mounting plate and the side of locating plate;

[0006] Screw gear and mounting plate are provided with reverse type planetary roller screw pair, the nut one end of reverse type planetary roller screw pair is sealingly fixedly connected with screw gear, and the nut other end is rotatably connected with mounting plate, the screw rod of reverse type planetary roller screw pair passes through mounting plate and is movably arranged along the axial direction relative to mounting plate.

[0007] Further, the reverse type planetary roller screw pair includes a nut, a screw rod is coaxially arranged in the nut, and the screw rod is drivingly engaged with the nut through a plurality of planetary studs arranged circumferentially.

[0008] Further, the nut is rotatably mounted on the mounting plate through a planetary roller bearing, and the planetary roller bearing takes the outer periphery of the nut as a bearing inner ring.

[0009] Further, the planetary roller bearing comprises a bearing outer ring sleeved outside the nut and fixedly connected with the mounting plate, the bearing inner ring is provided with a bearing inner thread with a zero helix angle, the outer periphery of the nut in the bearing outer ring is provided with a bearing outer thread with a zero helix angle, and the second roller is arranged between the bearing outer ring and the nut, the second roller is provided with roller threads with a zero helix angle and rotatably engaged with the bearing inner thread of the bearing outer ring and the bearing outer thread of the outer periphery of the nut respectively, and the two ends of the second roller are rotatably arranged between the bearing outer ring and the nut through the retainer.

[0010] Further, the nut is provided with a positioning flange sleeved on the lead screw and fixed with the bearing outer ring at the end away from the lead screw gear, and the positioning flange is arranged in abutment with the corresponding end of the nut.

[0011] The end of the bearing outer ring close to the positioning plate is connected with a gland, and the skeleton oil seal is arranged between the gland and the nut and between the positioning flange and the lead screw respectively, so that the reverse planetary roller lead screw pair and the planetary roller bearing form a closed cavity respectively.

[0012] Further, the sealing ring is arranged between the gland and the bearing outer ring and between the positioning flange and the bearing outer ring respectively.

[0013] Further, the inner side wall of the bearing outer ring is provided with a strip-shaped gap penetrating in the thickness direction, the width of the strip-shaped gap at the port position is greater than the outer diameter of the second roller, a strip-shaped movable block is arranged in the strip-shaped gap in a matching mode, the inner wall of the strip-shaped movable block is provided with an arc-shaped segment thread formed integrally with the bearing inner thread of the bearing outer ring, the bearing outer ring is provided with a countersunk bolt hole, and the countersunk bolt hole is threadedly connected with a countersunk bolt threadedly connected with the strip-shaped movable block.

[0014] Further, the nut is provided with a positioning flange sleeved on the lead screw and fixed with the bearing outer ring at the end away from the lead screw gear, and the positioning flange is arranged in abutment with the corresponding end of the nut.

[0015] Further, the center of the shaft is provided with a first oil hole penetrating in the axial direction, the outer end of the first oil hole is connected with a first oil port, the first oil port is communicated with the inner cavity of the reverse planetary roller lead screw pair through the first oil hole, the side wall of the nut is provided with a second oil hole for communicating the cavities of the reverse planetary roller lead screw pair and the planetary roller bearing, and the outer wall of the bearing outer ring is connected with a second oil port communicating the inner cavity of the planetary roller bearing.

[0016] The utility model discloses the beneficial effects of:

[0017] The utility model discloses the planetary roller bearing replaces the ordinary bearing in prior art, and the rotary connection between the reverse planetary roller lead screw pair and the mounting plate is realized through the roller bearing, the roller in the roller bearing can effectively improve the axial stress area and can increase the roller density, and the axial carrying capacity is improved, thereby adapting the use of heavy load occasion.

[0018] The utility model discloses set up the lubricating oil delivery oil channel of intercommunication reverse type planetary roller screw pair and planetary roller bearing, can alleviate the wear and tear between the transmission parts under heavy load through lubricating oil, reduce the temperature in the working process of pressure equipment, can transport the debris generated by wear and tear simultaneously, thereby effectively prolonging the service life of equipment.

[0019] The utility model discloses set up the lubricating oil delivery oil channel of intercommunication reverse type planetary roller screw pair and planetary roller bearing, can alleviate the wear and tear between the transmission parts under heavy load through lubricating oil, reduce the temperature in the working process of pressure equipment, can transport the debris generated by wear and tear simultaneously, thereby effectively prolonging the service life of equipment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the perspective view of the utility model;

[0021] Figure 2 It is the sectional view of the utility model;

[0022] Figure 3 It is Figure 2 the local schematic view in;

[0023] Figure 4 It is Figure 3 the enlarged view of A part in;

[0024] Figure 5 It is the sectional view of intercommunication reverse type planetary roller screw pair;

[0025] Figure 6 It is the sectional view of planetary roller bearing. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model, and the orientation descriptions such as up and down, front and back, left and right in the embodiments are only for describing the positional relationship of various components, and are not a limitation to the embodiments.

[0027] As Figures 1-6 shown, the utility model discloses the positioning plate 1 and the mounting plate 2 of parallel interval arrangement, install bearing seat 3 and drive motor 7 on positioning plate 1, the bearing seat 3 is rotatoryly installed with the shaft 5 through deep groove ball bearing 4 in, the shaft 5 is stretched out positioning plate 1 downward and integrally arranged with screw gear 6, and the output end of drive motor 7 is stretched out positioning plate 1 downward, and is fixed with the driving gear 8 that meshes with screw gear 6.

[0028] A reverse planetary roller screw pair 9 is arranged between the screw gear 6 and the mounting plate 1, and the reverse planetary roller screw pair 9 is a mature product purchased in the market, and specifically includes a nut 9.1, the inner periphery of the nut 9.1 is provided with a multi-start internal thread, the nut 9.1 is coaxially provided with a screw rod 9.2, the screw rod 9.2 extends out of the mounting plate 2 and is movably arranged along the axial direction of the mounting plate 2, the screw rod 9.2 is provided with a multi-start external thread, the screw rod 9.2 is in driving engagement with the nut 9.1 through a plurality of planetary studs 9.3 arranged in the circumferential direction, the two ends of the planetary stud 9.3 are mounted in the nut 9.1 through a planetary retainer 9.4, the outer side end of the planetary retainer 9.4 is limited by a circlip 9.5 clamped on the screw rod 9.2, and the screw rod 9.2 is provided with a first involute gear 9.6 at both ends of the multi-start external thread, and the two ends of the planetary stud 9.3 are provided with a second involute gear 9.7 in engagement with the first involute gear 9.6.

[0029] The upper end of the nut 9.1 is sealingly and fixedly connected with the screw gear 6, and the lower end of the nut 9.1 is rotatably mounted on the mounting plate 2 through a planetary roller bearing 10, and the planetary roller bearing 10 takes the outer periphery of the nut 9.1 as a bearing inner ring, specifically, the planetary roller bearing 10 includes a bearing outer ring 10.1 which is sleeved on the outer periphery of the nut 9.1 and is fixedly connected with the mounting plate 2, the bearing outer ring 10.1 is provided with a bearing internal thread with a zero helix angle, the outer periphery of the nut 9.1 in the bearing outer ring 10.1 is provided with a bearing external thread with a zero helix angle, and a second roller 10.3 is arranged between the bearing outer ring 10.1 and the nut 9.1, the second roller 10.3 is provided with roller threads with a zero helix angle and is in rotational engagement with the bearing internal thread of the bearing outer ring 10.1 and the bearing external thread of the outer periphery of the nut 9.1 respectively, and the two ends of the second roller 10.3 are rotatably mounted between the bearing outer ring 10.1 and the nut 9.1 through a retainer 10.4.

[0030] The inner side wall of the bearing outer ring 10.1 is provided with a strip-shaped notch 10.5 penetrating in the thickness direction, the width of the port position of the strip-shaped notch 10.5 is greater than the outer diameter of the second roller 10.3, a strip-shaped movable block 10.6 is fitted in the strip-shaped notch 10.5, the inner wall of the strip-shaped movable block 10.6 is provided with an arc-shaped segment thread 10.7 which is formed integrally with the bearing internal thread of the bearing outer ring 10.1, a countersunk bolt hole 10.8 is arranged on the bearing outer ring 10.1, a countersunk bolt 10.9 which is in threaded connection with the strip-shaped movable block 10.6 is threadedly connected in the countersunk bolt hole 10.8, and a plug 10.2 is threadedly connected to the nut end of the countersunk bolt 10.9.

[0031] In assembling the second roller 10.3, loosen the countersunk head bolt 10.9, remove the strip-shaped movable block 10.6 of the strip-shaped gap 10.5, and sequentially assemble the second roller 10.3 between the bearing outer ring 10.1 and the nut 9.1 at the position of the strip-shaped gap 10.5, and finally assemble the strip-shaped movable block 10.6, lock the countersunk head bolt 10.9, and connect the plug 10.2.

[0032] The lower end of the nut 9.1 is provided with a positioning flange 11 sleeved on the lead screw 9.2 and fixed with the bearing outer ring 10.1, and the positioning flange 11 is arranged in close contact with the corresponding end of the nut 9.1; the bearing outer ring 10.1 is connected with a gland 12 at one end close to the positioning plate 1, and a skeleton oil seal 13 is arranged between the gland 12 and the nut 9.1 and between the positioning flange 11 and the lead screw 9.2, respectively, and a sealing ring 14 is arranged between the gland 12 and the bearing outer ring 10.1 and between the positioning flange 11 and the bearing outer ring 10.1, respectively, so that the reverse planetary roller screw pair 9 and the planetary roller bearing 10 form a closed cavity.

[0033] The center of the rotating shaft 5 is provided with a first oil hole 15 penetrating in the axial direction, and the outer end of the first oil hole 15 is connected with a first oil port 16, the first oil port 16 is communicated with the inner cavity of the reverse planetary roller screw pair 9 through the first oil hole 15, and the sidewall of the nut 9.1 is provided with a second oil hole 16 for communicating the cavities of the reverse planetary roller screw pair 9 and the planetary roller bearing 10, and the outer wall of the bearing outer ring 10.1 is connected with a second oil port 17 for communicating the inner cavity of the planetary roller bearing 10.

[0034] During the working of the utility model, the driving motor 7 drives the driving gear 8 to rotate, the lead screw gear 6 is driven to rotate, the nut 9.1 is driven to rotate through the lead screw gear 6, and the nut 9.1 drives the lead screw 9.2 to stretch and retract through the planetary stud 9.3.

[0035] During the working process, the lubricating oil for cooling and lubrication is circulated and transported into the reverse planetary roller screw pair 9 and the planetary roller bearing 10 through the first oil hole 15 and the second oil port 17, so as to realize the lubrication and cooling between the components in the reverse planetary roller screw pair 9 and the planetary roller bearing 10.

Claims

1. A high-load drive based on a reverse planetary roller screw, characterized by: It includes a positioning plate and a mounting plate arranged in parallel and spaced apart. A bearing seat and a drive motor are installed on the side of the positioning plate away from the mounting plate. A rotating shaft is rotatably installed in the bearing seat through a bearing. The rotating shaft passes through the positioning plate on one side of the mounting plate and is integrally provided with a lead screw gear. The output end of the drive motor passes through the positioning plate on the side of the mounting plate and is fixed with a driving gear meshing with the lead screw gear. A reverse planetary roller screw pair is arranged between the screw gear and the mounting plate. One end of the nut of the reverse planetary roller screw pair is sealed and fixedly connected to the screw gear, and the other end of the nut is rotatably connected to the mounting plate. The screw of the reverse planetary roller screw pair passes through the mounting plate and is axially movable relative to the mounting plate.

2. A high-load-bearing drive based on a reverse planetary roller screw according to claim 1, characterized in that: The reverse planetary roller screw pair includes a nut, a screw rod is coaxially arranged in the nut, and the screw rod is driven and meshed with the nut through a plurality of planetary studs arranged along the circumferential direction.

3. The high-load-bearing drive based on a reverse planetary roller screw according to claim 1, characterized in that: The nut is rotatably mounted on the mounting plate through a planetary roller bearing, and the planetary roller bearing uses the outer periphery of the nut as the inner ring of the bearing.

4. The high-load-bearing drive based on a reverse planetary roller screw according to claim 3, characterized in that: The planetary roller bearing includes a bearing outer ring that is sleeved on the outside of the nut and fixedly connected to the mounting plate. The bearing inner ring is provided with a bearing internal thread with a helix angle of zero. The outer periphery of the nut in the bearing outer ring is provided with a bearing external thread with a helix angle of zero. A second roller is provided between the bearing outer ring and the nut. The second roller is provided with a roller thread with a helix angle of zero and is rotatably engaged with the bearing internal thread of the bearing outer ring and the bearing external thread of the nut outer periphery respectively. The two ends of the second roller are rotatably mounted between the bearing outer ring and the nut through a retaining frame.

5. The high-load-bearing drive based on a reverse planetary roller screw according to claim 4, characterized in that: The end of the nut away from the screw gear is provided with a positioning flange which is sleeved on the screw and fixed to the outer ring of the bearing, and the positioning flange is fitted with the corresponding end of the nut; A gland is connected to one end of the bearing outer ring close to the positioning plate. Skeleton oil seals are installed between the gland and the nut, and between the positioning flange and the screw rod, so that the reverse planetary roller screw pair and the planetary roller bearing form closed cavities respectively.

6. The high-load-bearing drive based on a reverse planetary roller screw according to claim 1, characterized in that: Sealing rings are respectively arranged between the gland and the bearing outer ring, and between the positioning flange and the bearing outer ring.

7. The high-load-bearing actuator based on a reverse planetary roller screw according to claim 4, characterized in that: The inner side wall of the bearing outer ring is provided with a strip-shaped notch that penetrates along the thickness direction. The width of the end position of the strip-shaped notch is greater than the outer diameter of the second roller. A strip-shaped movable block is arranged in the strip-shaped notch. The inner wall of the strip-shaped movable block is provided with an arc-shaped segment thread that forms an integral part with the bearing inner thread of the bearing outer ring. A countersunk bolt hole is provided on the bearing outer ring. The inner thread of the countersunk bolt hole is connected to a countersunk bolt that is threadedly connected to the strip-shaped movable block.

8. The high-load-bearing drive based on a reverse planetary roller screw according to claim 7, characterized in that: The nut end of the countersunk bolt is threaded with a plug.

9. The high-load-bearing drive based on a reverse planetary roller screw according to claim 4, characterized in that: A first oil hole is provided in the center of the rotating shaft and runs through the rotating shaft in the axial direction. The outer end of the first oil hole is connected to the first oil port. The first oil port is connected to the inner cavity of the reverse planetary roller screw pair through the first oil hole. A second oil hole is provided on the side wall of the nut to connect the cavity of the reverse planetary roller screw pair and the planetary roller bearing. The outer wall of the outer ring of the bearing is connected to the second oil port connected to the inner cavity of the planetary roller bearing.

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