High-rigidity push rod linear motor

Abstract

The high-rigidity push rod linear motor comprises a guide shaft, a locking nut, a front bearing, a front end cover, a hollow shaft, a rotor, a stator, a rear bearing and a rear end cover, one end of the hollow shaft penetrates through the front bearing and then is connected with the front end cover, the other end of the hollow shaft penetrates through the rear bearing and then is connected with the rear end cover, and the rotor is installed on the outer side of the hollow shaft. The stator is installed on the outer side of the rotor, the linear motor further comprises a ball spline, and the guide shaft sequentially penetrates through the ball spline and the locking nut and then is connected with the hollow shaft. Compared with the prior art, the utility model has the advantages of high rigidity, high precision and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of, in particular to a kind of high rigidity push rod linear motor. BACKGROUND

[0002] Linear motor or linear motor, adopt intermeshing screw and nut, convert rotation into linear motion. After searching China patent publication No. CN221177456U discloses a kind of novel through ball screw motor, including: stator and the front end of being installed with front box cover, is installed with rear end cover at its rear end, stator is installed with rotor, the front end outer side of the shaft of rotor is equipped with large bearing, rear end outer side is equipped with small bearing, wherein large bearing outer ring is installed in front box cover, small bearing outer ring is installed in rear end cover, the front end of the shaft of rotor is fixed with screw nut, ball screw is sequentially through front box cover, screw nut, rotor, rear end cover, the shaft of rotor is provided with axial through-hole, the existing patent screw needs to prevent screw nut relative rotation by external mechanism, realize screw axial movement. The above prior art has the following shortcomings:

[0003] 1) screw needs to prevent rotation by external mechanism: screw does not have anti-rotation design itself, and needs to add anti-rotation mechanism to realize linear movement;

[0004] 2) weak axial rigidity: motor rear end cover bearing needs to select smaller bearing due to structural limitation, and pre-tightening nut is applied with certain pre-tightening force on bearing, so that bearing is easily damaged when bearing axial thrust.

[0005] 3) weak radial rigidity: motor screw is only connected with nut, and radial force bearing capacity is weak. UTILITY MODEL CONTENTS

[0006] The utility model aims at overcoming the defects of the prior art and provides a high rigidity push rod linear motor.

[0007] The utility model can achieve the purpose by the following technical solutions.

[0008] According to one aspect of the utility model, a high rigidity push rod linear motor is provided, which comprises a guide shaft, a locking nut, a front bearing, a front end cover, a hollow shaft, a rotor, a stator, a rear bearing and a rear end cover. The hollow shaft is connected with the front end cover at one end after passing through the front bearing, and is connected with the rear end cover at the other end after passing through the rear bearing. The rotor is installed outside the hollow shaft. The stator is installed outside the rotor. The linear motor further comprises a ball spline. The guide shaft is connected with the hollow shaft after sequentially passing through the ball spline and the locking nut.

[0009] As a preferred technical solution, the locking nut is provided with a positioning circle and a thread. The thread is connected with the hollow shaft, and the flange surface of the locking nut is uniformly attached to the inner ring of the front bearing.

[0010] As a preferred technical scheme, the guide shaft comprises a push rod, a first surface of the push rod is provided with a first raceway, a second surface of the ball spline is provided with a second raceway, the first raceway and the second raceway are matched with each other through balls, axial movement is realized, and rotation of the guide shaft is limited.

[0011] As a preferred technical scheme, the guide shaft comprises a screw rod, a third surface of the screw rod is provided with a third raceway, first and second backflow devices are arranged on two sides of the screw rod, a fourth surface of the hollow shaft is provided with a fourth raceway, and the third raceway and the fourth raceway are matched with each other through balls, so as to convert rotary motion of the hollow shaft into linear motion.

[0012] As a preferred technical scheme, the ball spline and the front end cover are connected through a screw, and an outer ring of the front bearing is locked.

[0013] As a preferred technical scheme, the locking nut and the hollow shaft lock an inner ring of the front bearing.

[0014] As a preferred technical scheme, two front bearings are arranged, and a gap elimination washer is arranged between the two front bearings.

[0015] As a preferred technical scheme, the front end cover is provided with a process groove, and the hollow shaft is provided with a step at a corresponding position; when assembled, the step passes through the process groove and is attached to the inner ring of the front bearing.

[0016] As a preferred technical scheme, a cross-sectional dimension of the process groove is greater than that of the step.

[0017] As a preferred technical scheme, the hollow shaft and the rear end cover are both provided with high-precision encoders.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1) Self-anti-rotation design: the guide shaft is matched with the ball spline to limit rotation of the guide shaft;

[0020] 2) High-rigidity design: two front bearings and the ball spline, better axial rigidity and radial rigidity;

[0021] 3) High-precision design: high rigidity and low deformation, matched with high-precision encoders, and position control is more accurate. DRAWINGS

[0022] Figure 1 It is a three-dimensional structure schematic view of the high-rigidity push rod linear motor.

[0023] Figure 2 It is a sectional structure schematic view of the high-rigidity push rod linear motor.

[0024] Figure 3 It is a sectional structure schematic view of the guide shaft of the utility model;

[0025] Figure 4 It is a structure schematic view of the front end cover of the utility model;

[0026] Figure 5 It is a sectional structure schematic view of the front end cover of the utility model;

[0027] Figure 6 It is a structure schematic view of the hollow shaft of the utility model;

[0028] Figure 7 It is a sectional structure schematic view of the hollow shaft of the utility model.

[0029] Wherein 1 is a guide shaft, 2 is a ball spline, 3 is a locking nut, 4 is a front bearing, 5 is a front end cover, 6 is a hollow shaft, 7 is a rotor, 8 is a stator, 9 is a rear bearing, 10 is a rear end cover, 11 is a magnetic bead, 12 is a magnetic encoder, 1a is a push rod, 1b is a first surface, 2a is a second surface, 1c is a screw rod, 1d is a third surface, 6a is a fourth surface, 1e is a first backflow device, 1f is a second backflow device, 3a is a positioning circle, 3b is a thread, 5a is a process groove, 6b is a step. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by a person of ordinary skill in the art without creative work should belong to the protection scope of the utility model.

[0031] As shown in Figure 1 and Figure 2 A high-rigidity push rod linear motor, comprising a guide shaft 1, a locking nut 3, a front bearing 4, a front end cover 5, a hollow shaft 6, a rotor 7, a stator 8, a rear bearing 9 and a rear end cover 10, one end of the hollow shaft 6 is connected with the front end cover 5 after penetrating through the front bearing 4, the other end is connected with the rear end cover 10 after penetrating through the rear bearing 9, the rotor 7 is installed outside the hollow shaft 6, the stator 8 is installed outside the rotor 7, the linear motor further comprises a ball spline 2, the guide shaft 1 is connected with the hollow shaft 6 after penetrating through the ball spline 2 and the locking nut 3 in sequence, the utility model has the functions of self-anti-rotation by cooperating the guide shaft 1 with the ball spline 2 to limit the rotation of the guide shaft 1.

[0032] As shown in Figure 2 The locking nut 3 is provided with a positioning circle 3a and a thread 3b, the thread 3b is connected with the hollow shaft 6, and the flange surface of the locking nut 3 is uniformly attached to the inner ring of the front bearing 4.

[0033] As Figure 3 shown, the guide shaft 1 includes a push rod 1a, the first surface 1b of the push rod 1a is provided with a first raceway, the second surface 2a of the ball spline 2 is provided with a second raceway, the first raceway and the second raceway are matched with each other through balls, axial movement is realized, and rotation of the guide shaft 1 is limited.

[0034] As Figure 3 shown, the guide shaft 1 includes a screw rod 1c, the third surface 1d of the screw rod 1c is provided with a third raceway, the screw rod 1c is provided with a first backflow device 1e and a second backflow device 1f on both sides, balls backflow in the screw rod 1c, when the hollow shaft 6 rotates, the ball spline 2 limits rotation of the guide shaft 1, meanwhile, the fourth surface 6a of the hollow shaft 6 is provided with a fourth raceway, the third raceway and the fourth raceway are matched with each other through balls, and the rotation movement of the hollow shaft 6 is converted into linear movement.

[0035] As Figure 2 shown, the ball spline 2 and the front end cover 5 are connected through screws, and the outer ring of the front bearing 4 is locked, the locking nut 3 and the hollow shaft 6 lock the inner ring of the front bearing 4, the front bearing 4 is provided with two, and a gap elimination washer is arranged between the two front bearings 4, axial gap is eliminated, then axial gap of the guide shaft 1 is eliminated, axial accuracy is improved, axial rigidity and radial rigidity are better through cooperation of the two front bearings and the ball spline.

[0036] As Figures 4-7 shown, the front end cover 5 is provided with process grooves 5a, the hollow shaft 6 is provided with steps 6b at corresponding positions, the steps 6b pass through the process grooves 5a and are attached to the inner ring of the front bearing 4 during assembly. The number and distribution of the process grooves 5a are same as those of the steps 6b, and the cross-sectional dimension of the process grooves 5a is greater than that of the steps 6b. The outer circle of the hollow shaft 6 can be designed to have a larger size, a larger bearing is used, and then axial rigidity and radial rigidity are improved.

[0037] As Figure 2 shown, the hollow shaft 6 is provided with magnetic beads 11 and a magnetic encoder 12, cooperation with a closed-loop control driver can realize high-precision position control.

[0038] Meanwhile, the rear end cover 10 can also be provided with other types of high-precision encoders, such as an optical encoder.

[0039] Embodiment 2

[0040] The ball spline 2 in embodiment 1 is replaced by an oil-containing bearing, the fourth surface 6a of the hollow shaft 6 and the third surface of the screw rod 1c are changed into trapezoidal threads 1d, product cost is greatly reduced under the condition of ensuring certain performance, and the rest is same as embodiment 1.

[0041] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be encompassed within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-rigidity push rod linear motor, comprising a guide shaft (1), a locking nut (3), a front bearing (4), a front end cover (5), a hollow shaft (6), a rotor (7), a stator (8), a rear bearing (9), and a rear end cover (10), wherein one end of the hollow shaft (6) passes through the front bearing (4) and is connected to the front end cover (5), and the other end passes through the rear bearing (9) and is connected to the rear end cover (10); the rotor (7) is mounted on the outside of the hollow shaft (6), and the stator (8) is mounted on the outside of the rotor (7), characterized in that, The linear motor also includes a ball spline (2), and the guide shaft (1) passes through the ball spline (2) and the locking nut (3) in sequence and is then connected to the hollow shaft (6).

2. The high-rigidity linear actuator motor according to claim 1, characterized in that, The locking nut (3) has a positioning circle (3a) and a thread (3b). The thread (3b) is connected to the hollow shaft (6) and makes the flange surface of the locking nut (3) fit evenly with the inner ring of the front bearing (4).

3. The high-rigidity linear actuator motor according to claim 1, characterized in that, The guide shaft (1) includes a push rod (1a), the first surface (1b) of which is provided with a first raceway, and the second surface (2a) of the ball spline (2) is provided with a second raceway. The first raceway and the second raceway cooperate with each other through the balls to achieve axial movement, while restricting the rotation of the guide shaft (1).

4. The high-rigidity linear actuator motor according to claim 1, characterized in that, The guide shaft (1) includes a lead screw (1c), the third surface (1d) of which is provided with a third raceway, and the two sides of the lead screw (1c) are provided with a first return valve (1e) and a second return valve (1f). The fourth surface (6a) of the hollow shaft (6) is provided with a fourth raceway. The third raceway and the fourth raceway cooperate with each other through ball bearings to convert the rotational motion of the hollow shaft (6) into linear motion.

5. The high-rigidity linear actuator motor according to claim 1, characterized in that, The ball spline (2) and the front cover (5) are connected by screws, which lock the outer ring of the front bearing (4).

6. The high-rigidity linear actuator motor according to claim 5, characterized in that, The locking nut (3) and hollow shaft (6) lock the inner ring of the front bearing (4).

7. A high-rigidity linear actuator motor according to claim 1 or 5, characterized in that, Two front bearings (4) are provided, and a gap-eliminating washer is provided between the two front bearings (4).

8. A high-rigidity linear actuator motor according to claim 6, characterized in that, The front cover (5) is provided with a process groove (5a), and the hollow shaft (6) is provided with a step (6b) at the corresponding position. During assembly, the step (6b) passes through the process groove (5a) and fits against the inner ring of the front bearing (4).

9. A high-rigidity linear actuator motor according to claim 8, characterized in that, The cross-sectional dimensions of the process tank (5a) are larger than those of the step (6b).

10. A high-rigidity linear actuator motor according to claim 1 or 5, characterized in that, Both the hollow shaft (6) and the rear end cover (10) are equipped with high-precision encoders.

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