CN209881572U

CN209881572U - Servo electric cylinder with compact structure

Info

Publication number: CN209881572U
Application number: CN201920752448.7U
Authority: CN
Inventors: 王瑞国; 张凌云
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2019-12-31
Anticipated expiration: 2029-05-23

Abstract

The utility model relates to a servo drive technical field, in particular to a compact structure type servo electric cylinder, which comprises a front end cover, a rear end cover and a cylinder shell, wherein a hollow motor, a planet roller screw and an output shaft are arranged in the cylinder shell, a locking nut and a coder are arranged at the right end of the planet roller screw, the hollow motor comprises a rotor shaft, a rotor, a stator and a motor shell, a stop nut and a first bearing are arranged at the right end of the rotor shaft, and a second bearing is arranged at the left end of the rotor shaft, the utility model discloses a connection structure between the planet roller screw and the rotor shaft is compact by the planet roller screw and the hollow motor through conical surface matching sleeve joint with 2 degrees +/-0.1 degrees of conicity, the conical surface matching sleeve joint and the locking nut, the processing difficulty is reduced, and the second bearing and the first bearing are double-row angular contact bearings, the bearing capacity of the rotor shaft is enhanced by the angular contact, the service life of the rotor shaft is prolonged.

Description

Servo electric cylinder with compact structure

Technical Field

The utility model relates to a servo drive technical field, concretely relates to compact structure type servo electric jar.

Background

The servo electric cylinder is a product integrating a servo motor and a screw rod, the rotary motion of the servo motor is converted into linear motion, and meanwhile, the accurate rotating speed control and the accurate torque control of the servo motor are converted into the accurate speed control, the accurate position control and the accurate thrust control, so that high-accuracy linear motion series products are realized.

SUMMERY OF THE UTILITY MODEL

To the current situation of the above prior art, the utility model aims to solve the technical problem that a compact structure type servo electric cylinder that processing is easy, practice thrift the cost, bearing capacity is big, long service life and convenient to use is provided.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a servo electric cylinder with a compact structure comprises a front end cover, a rear end cover and a cylinder shell, wherein one end of the cylinder shell is fixedly connected with the rear end cover, the other end of the cylinder shell is fixedly connected with the front end cover, a hollow motor, a planetary roller screw and an output shaft are arranged in the cylinder shell, the output shaft is in threaded connection with the planetary roller screw, the planetary roller screw and the hollow motor are sleeved in a conical surface fit manner with the taper of 2 +/-0.1 degrees, a locking nut and an encoder are arranged at the right end of the planetary roller screw, the encoder is sleeved on the planetary roller screw, the planetary roller screw is in threaded connection with the locking nut, the hollow motor comprises a rotor shaft, a rotor, a stator and a motor shell, the motor shell is in adhesive connection with the stator, the stator is positioned at the outer side of the rotor, and the rotor shaft are in interference fit or adhesive connection, the right end of the rotor shaft is provided with a stop nut and a first bearing, the first bearing is positioned at the left end of the stop nut, the stop nut and the first bearing are both sleeved on the rotor shaft, the left end of the rotor shaft is provided with a second bearing, the second bearing is sleeved on the rotor shaft, the second bearing and the first bearing are both double-row angular contact bearings, as the planetary roller screw and the hollow motor are sleeved by adopting a conical surface with the taper of 2 +/-0.1 degrees in a matched manner, and the planetary roller screw is in threaded connection with the lock nut, the conical surface is sleeved with the lock nut in a matched manner, the connection structure between the planetary roller screw and the rotor shaft is compact, the servo volume is reduced, the processing difficulty of the planetary roller screw, the rotor shaft and the rotor can be reduced, the manufacturing cost is reduced, the processing is easy, the cost is saved, and the encoder is sleeved on the planetary roller screw, the encoder can be accurate feedback servo output's position precision, and the person of facilitating the use uses and controls servo electric jar, its advantage convenient to use, and the second bearing with first bearing is double-row angular contact bearing, and first bearing is used for bearing outside thrust and transmits the effort for the rotor shaft, and the primary function of second bearing bears partial rotor shaft thrust, and double-row angular contact bearing can carry out axial float, strengthens the bearing capacity of rotor shaft, can prolong the life of rotor shaft, its advantage bearing capacity is big and long service life.

Preferably, the output shaft is provided with a shaft shoulder, the shaft shoulder is positioned at the right end of the output shaft, the output shaft and the shaft shoulder are of an integral structure, and the shaft shoulder are of an integral structure, so that the shaft shoulder and the nut are matched and mounted, the mounting space of the output shaft and the nut can be reduced, the occupied space of the nut is reduced, the nut is matched with the existing standard hollow motor, a non-standard motor does not need to be customized, the manufacturing cost of the servo electric cylinder can be reduced, and the servo electric cylinder has the advantage of cost saving.

Preferably, the planetary roller screw comprises a nut, a roller and a screw rod, the screw rod is connected with the roller in a meshed manner, the roller is connected with the nut in a meshed manner, a first mounting hole, a second mounting hole and a third mounting hole are arranged in the nut, the third mounting hole is arranged between the second mounting holes, the second mounting hole is arranged at the right end of the first mounting hole, a gear ring and a retainer are arranged in the second mounting hole, the retainer is sleeved in the gear ring, the gear ring is sleeved in the nut, the roller is connected with the nut in a meshed manner due to the fact that the screw rod is connected with the roller in a meshed manner, the screw rod, the roller and the nut are core transmission parts of the planetary roller screw, and the planetary roller screw is higher than the highest linear velocity and the rotation speed of the ball screw, higher in static bearing capacity and longer in service life.

Preferably, still be provided with the blotter on the output shaft, the blotter cup joints on the output shaft, because the blotter cup joints on the output shaft, when the output shaft moved to the rightmost end, the blotter played the effect of buffering, avoided output shaft and front end housing to bump to cause the damage of servo electric jar, consequently the blotter can prolong servo electric jar's life, its advantage long service life.

Preferably, be provided with the binding post plug on the rear end cap, the binding post plug with the hollow motor electricity is connected, because the binding post plug with the hollow motor electricity is connected, the user can be with hollow motor and external power switch-on through the binding post plug, and the wiring process is simple, and is easy and simple to handle, its advantage convenient to use.

Preferably, a dust ring and a guide bearing are arranged in the front end cover, the guide bearing is arranged at the right end of the dust ring, the dust ring and the guide bearing are all sleeved in the front end cover, because the dust ring, the dust ring and the guide bearing are all sleeved in the front end cover, the dust ring is used for scraping large particles on the surface of the output shaft, the dust ring is prevented from contacting with the dust ring to cause failure of the dust ring, the service time of the dust ring is prolonged, the dust ring is contacted with the surface of the output shaft to form shaft surface sealing, external dust and water vapor are prevented from entering the electric cylinder to cause damage of the servo electric cylinder, the service life of the servo electric cylinder is prolonged, the guide bearing mainly provides support and guide for the linear reciprocating motion of the output shaft, so that the motion of the output shaft is more stable and reliable, ensure the normal use of the electric cylinder and have the advantage of long service life.

Preferably, the material of direction bearing is wear-resisting engineering plastics, because the material of direction bearing is wear-resisting engineering plastics, wear-resisting engineering plastics has better wearability and can realize the characteristics of self-lubricating, reduces the maintenance work of direction bearing, and is more convenient during the use, its advantage convenient to use.

Compared with the prior art, the utility model has the advantages of: the utility model has the advantages that the planetary roller screw and the hollow motor are sleeved by the conical surface with the taper of 2 +/-0.1 degrees, the planetary roller screw is in threaded connection with the locking nut, the conical surface is sleeved and the locking nut ensures that the connection structure between the planetary roller screw and the rotor shaft is compact, the servo volume is reduced, the processing difficulty of the planetary roller screw, the rotor shaft and the rotor can be reduced, the manufacturing cost is reduced, the planetary roller screw is easy to process and saves the cost, the encoder is sleeved on the planetary roller screw, the encoder can accurately feed back the position precision of servo output, a user can conveniently use and control the servo electric cylinder, the planetary roller screw has the advantages of convenient use, the second bearing and the first bearing are double-row angular contact bearings, the first bearing is used for bearing the acting force transmitted by the external thrust to the rotor shaft, and the main action of the second bearing bears part of, the double-row angular contact ball bearing can axially float, the bearing capacity of the rotor shaft is enhanced, the service life of the rotor shaft can be prolonged, the double-row angular contact ball bearing has the advantages of large bearing capacity and long service life, the output shaft and the shaft shoulder are of an integral structure, the shaft shoulder and the nut are matched and installed, the installation space of the output shaft and the nut can be reduced, the occupied space of the nut is reduced, the nut is matched with the existing standard hollow motor, a non-standard motor is not required to be customized, the manufacturing cost of a servo electric cylinder can be reduced, the double-row angular contact ball bearing has the advantages of saving the cost, the screw rod is connected with the screw in a meshed manner, the screw rod, the roller and the nut are core transmission parts of the planetary roller screw, the planetary roller screw is higher than the highest linear velocity and the rotating speed of the ball screw, large static bearing capacity and long service life, and, and the buffer pad is sleeved on the output shaft, when the output shaft moves to the rightmost end, the buffer pad plays a buffer role, and the output shaft is prevented from colliding with the front end cover, so that the servo electric cylinder is damaged, the buffer pad can prolong the service life of the servo electric cylinder, the service life of the servo electric cylinder is long, the wiring terminal plug is electrically connected with the hollow motor, a user can connect the hollow motor with an external power supply through the wiring terminal plug, the wiring process is simple, the operation is simple and convenient, the use is convenient, the dust scraping ring, the dust ring and the guide bearing are all sleeved in the front end cover, the dust scraping ring is used for scraping large particles on the surface of the output shaft, the dust ring is prevented from being failed due to the contact of the large particles with the dust ring, the service time of the dust ring is prolonged, the dust ring is in contact with the surface of the output, prevent that external dust and aqueous vapor from getting into inside the electric jar, cause the damage of servo electric jar, the life of extension servo electric jar, the direction bearing mainly provides support and direction for the straight reciprocating motion of output shaft, make the motion of output shaft more reliable and stable, ensure the normal use of electric jar, its advantage is long service life, and the material of direction bearing is wear-resisting engineering plastics, wear-resisting engineering plastics has better wearability and can realize the characteristics of self-lubricating, reduce the maintenance work of direction bearing, it is more convenient during the use, its advantage is convenient to use.

Drawings

Fig. 1 is a schematic sectional structure of the present invention;

fig. 2 is a schematic structural view of the nut of the present invention.

Wherein: 1-front end cover; 2-rear end cap; 3-a cylinder shell; 4-a hollow motor; 5-planetary roller screw; 6-an output shaft; 7-locking the nut; 8-an encoder; 9-a stop nut; 10-a first bearing; 11-a second bearing; 12-shaft shoulder; 13-a buffer pad; 14-a terminal plug; 15-a dust scraping ring; 16-a dust ring; 17-a guide bearing; 4-1-rotor shaft; 4-2-rotor; 4-3-stator; 4-4-motor housing; 5-1-nut; 5-2-rollers; 5-3-lead screw; 5-4-gear ring; 5-5-cage; 5-1-1-a first mounting hole; 5-1-2-a second mounting hole; 5-1-3-third mounting hole.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and grasped.

As shown in fig. 1-2, a servo electric cylinder with a compact structure comprises a front end cover 1, a rear end cover 2 and an electric cylinder shell 3, one end of the electric cylinder shell 3 is fixedly connected with the rear end cover 2, the other end of the electric cylinder shell 3 is fixedly connected with the front end cover 1, a hollow motor 4, a planetary roller screw 5 and an output shaft 6 are arranged in the electric cylinder shell 3, the output shaft 6 is in threaded connection with the planetary roller screw 5, the planetary roller screw 5 and the hollow motor 4 are in matched sleeve joint by a conical surface with 2 degrees +/-0.1 degree of taper, a locking nut 7 and an encoder 8 are arranged at the right end of the planetary roller screw 5, the encoder 8 is sleeved on the planetary roller screw 5, the planetary roller screw 5 is in threaded connection with the locking nut 7, and the hollow motor 4 comprises a rotor shaft 4-1 and a rotor 4-2, The motor comprises a stator 4-3 and a motor shell 4-4, the motor shell 4-4 is connected with the stator 4-3 in a bonding manner, the stator 4-3 is positioned at the outer side of a rotor 4-2, the rotor 4-2 is connected with a rotor shaft 4-1 in an interference fit or bonding manner, a stop nut 9 and a first bearing 10 are arranged at the right end of the rotor shaft 4-1, the first bearing 10 is positioned at the left end of the stop nut 9, the stop nut 9 and the first bearing 10 are both sleeved on the rotor shaft 4-1, a second bearing 11 is arranged at the left end of the rotor shaft 4-1, the second bearing 11 is sleeved on the rotor shaft 4-1, the second bearing 11 and the first bearing 10 are both double-row angular contact bearings, a shaft shoulder 12 is arranged on the output shaft 6, and the shaft shoulder 12 is positioned at the right end of the output shaft 6, the output shaft 6 and the shaft shoulder 12 are of an integral structure, the planetary roller screw 5 comprises a nut 5-1, rollers 5-2 and a screw 5-3, the screw 5-3 is meshed with the rollers 5-2, the rollers 5-2 are meshed with the nut 5-1, a first mounting hole 5-1-1, a second mounting hole 5-1-2 and a third mounting hole 5-1-3 are arranged in the nut 5-1, the third mounting hole 5-1-3 is positioned between the second mounting holes 5-1-2, the second mounting hole 5-1-2 is positioned at the right end of the first mounting hole 5-1-1, a gear ring 5-4 and a retainer 5-5 are arranged in the second mounting hole 5-1-2, the dustproof structure comprises a retainer 5-5, a gear ring 5-4, a nut 5-1, a buffer pad 13, a rear end cover 2, a wiring terminal plug 14, a dust ring 15, a dust ring 16 and a guide bearing 17, wherein the retainer 5-5 is sleeved in the gear ring 5-4, the gear ring 5-4 is sleeved in the nut 5-1, the buffer pad 13 is further arranged on the output shaft 6, the wiring terminal plug 14 is arranged on the rear end cover 2, the wiring terminal plug 14 is electrically connected with the hollow motor 4, the front end cover 1 is internally provided with the dust ring 15, the dust ring 16 and the guide bearing 17, the guide bearing 17 is arranged at the right end of the dust ring 16, the dust ring 16 is arranged at the right end of the dust ring 15, the dust ring 16 and the guide bearing 17 are.

The working process of the compact servo electric cylinder is as follows: firstly, an output shaft of a servo electric cylinder is connected with an external part, then an external power supply and a control power supply are connected with the servo electric cylinder through a connecting terminal plug, then a user sends a control signal to a hollow motor to control the hollow motor to work, a stator of the hollow motor works to drive a rotor to rotate, the rotor drives a rotor shaft to rotate, the rotor shaft drives a screw rod to rotate, the screw rod rotates to drive a roller to rotate, the roller rotates to drive a nut to axially move along the screw rod, the nut drives an output shaft to axially move, in the working process of the servo electric cylinder, the planetary roller screw and the hollow motor are sleeved by adopting conical surface matching, the planetary roller screw is in threaded connection with a locking nut, the connecting structure between the planetary roller screw and the rotor shaft is compact by the conical surface matching and the locking nut, the servo volume is reduced, and the processing difficulty of the planetary roller screw, the rotor shaft and, the manufacturing cost is reduced, the second bearing and the first bearing are both double-row angular contact bearings, the first bearing is used for bearing the acting force transmitted to the rotor shaft by external thrust, the main function of the second bearing is bearing part of the thrust of the rotor shaft, the double-row angular contact ball bearings can axially float, when the output shaft moves to the rightmost end, the buffer cushion plays a role of buffering, the collision between the output shaft and the front end cover is avoided, the dust ring is used for scraping large particles on the surface of the output shaft, the dust ring is prevented from being failed due to the contact of the large particles and the dust ring, the service life of the dust ring is prolonged, the dust ring is in contact with the surface of the output shaft, a shaft surface seal is formed, external dust and water vapor are prevented from entering the electric cylinder to damage the electric cylinder, the service life of the electric cylinder is prolonged, and the guide bearing mainly provides support and guide, the movement of the output shaft is more stable and reliable, and the normal use of the electric cylinder is ensured.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A servo electric cylinder with a compact structure comprises a front end cover (1), a rear end cover (2) and an electric cylinder shell (3), wherein one end of the electric cylinder shell (3) is fixedly connected with the rear end cover (2), the other end of the electric cylinder shell (3) is fixedly connected with the front end cover (1), the servo electric cylinder is characterized in that a hollow motor (4), a planetary roller screw (5) and an output shaft (6) are arranged in the electric cylinder shell (3), the output shaft (6) is in threaded connection with the planetary roller screw (5), the planetary roller screw (5) and the hollow motor (4) are in matched sleeve joint by adopting a conical surface with the taper of 2 +/-0.1 degrees, a locking nut (7) and an encoder (8) are arranged at the right end of the planetary roller screw (5), the encoder (8) is sleeved on the planetary roller screw (5), and the planetary roller screw (5) is in threaded connection with the locking nut (7), the hollow motor (4) comprises a rotor shaft (4-1), a rotor (4-2), a stator (4-3) and a motor shell (4-4), the motor shell (4-4) is connected with the stator (4-3) in a bonding mode, the stator (4-3) is located on the outer side of the rotor (4-2), the rotor (4-2) is connected with the rotor shaft (4-1) in an interference fit or bonding mode, a stop nut (9) and a first bearing (10) are arranged at the right end of the rotor shaft (4-1), the first bearing (10) is located at the left end of the stop nut (9), the stop nut (9) and the first bearing (10) are both sleeved on the rotor shaft (4-1), and a second bearing (11) is arranged at the left end of the rotor shaft (4-1), the second bearing (11) is sleeved on the rotor shaft (4-1), and the second bearing (11) and the first bearing (10) are both double-row angular contact bearings.

2. A servo cylinder as claimed in claim 1, wherein the output shaft (6) is provided with a shoulder (12), the shoulder (12) is located at the right end of the output shaft (6), and the output shaft (6) and the shoulder (12) are of an integral structure.

3. The servo electric cylinder with compact structure as recited in claim 1, characterized in that the planetary roller screw (5) comprises a nut (5-1), rollers (5-2) and a screw (5-3), the screw (5-3) is engaged with the rollers (5-2), the rollers (5-2) are engaged with the nut (5-1), the nut (5-1) is provided with a first mounting hole (5-1-1), a second mounting hole (5-1-2) and a third mounting hole (5-1-3), the third mounting hole (5-1-3) is located between the second mounting holes (5-1-2), the second mounting hole (5-1-2) is located at the right end of the first mounting hole (5-1-1), a gear ring (5-4) and a retainer (5-5) are arranged in the second mounting hole (5-1-2), the retainer (5-5) is sleeved in the gear ring (5-4), and the gear ring (5-4) is sleeved in the screw nut (5-1).

4. The servo electric cylinder with compact structure as claimed in claim 1, wherein a cushion pad (13) is further disposed on the output shaft (6), and the cushion pad (13) is sleeved on the output shaft (6).

5. A compact servo cylinder according to claim 1, characterized in that the rear end cap (2) is provided with a terminal plug (14), and the terminal plug (14) is electrically connected with the hollow motor (4).

6. The servo electric cylinder with the compact structure according to claim 1, characterized in that a dust ring (15), a dust ring (16) and a guide bearing (17) are arranged in the front end cover (1), the guide bearing (17) is arranged at the right end of the dust ring (16), the dust ring (16) is arranged at the right end of the dust ring (15), and the dust ring (15), the dust ring (16) and the guide bearing (17) are all sleeved in the front end cover (1).

7. Servo cylinder according to claim 6, characterized in that the guide bearing (17) is made of wear-resistant engineering plastic.