Silent linear motor
By using elastic members in a linear motor to apply reverse tension on the mover push rod, the problem of noise generated by impact between the mover push rod and the shell is solved, and the low noise and efficient operation of the silent linear motor is achieved.
Patent Information
- Application Number
- CN202422546351.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-10-21
AI Technical Summary
Existing linear motors still produce high noise when the mover push rod is reciprocating, although it is equipped with shock absorbers or springs for buffering.
A silent linear motor is designed, using the elastic member in the shell to apply a tensile force opposite to its movement direction to the mover push rod, and the elastic force of the elastic member balances the movement of the mover push rod, avoids the impact of it with the inner wall of the shell, and eliminates the use of shock absorbers or springs.
It effectively reduces the noise of linear motors, improves the operating stability and efficiency of the motor, reduces friction resistance, and improves output efficiency.
Smart Images
Figure CN223273987U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motor manufacturing, in particular to a silent linear motor. Background Art
[0002] Linear motors are a new type of electric actuator with a wide range of applications and advantages. They utilize a cylindrical structure and incorporate linear drive technology to achieve linear motion, while also offering high speed, high precision, and high efficiency.
[0003] Common linear motors are equipped with shock absorbers or springs at both ends to mitigate the impact of the reciprocating motion of the actuator rod, preventing it from striking the motor housing and generating loud noise. However, significant noise can still be generated when the actuator strikes the shock absorbers or springs during reciprocating motion. Utility Model Content
[0004] The main purpose of the utility model is to provide a silent linear motor, aiming to further reduce the noise generated by the linear motor.
[0005] To achieve the above-mentioned purpose, the silent linear motor proposed in the present invention comprises:
[0006] A housing, wherein the housing is provided with a through hole;
[0007] A magnetic induction component, comprising a coil assembly, a magnetic ring, and a movable push rod, wherein the coil assembly is disposed within the housing and encloses the housing to form a motion cavity; the magnetic ring and the movable push rod are both located within the motion cavity, the magnetic ring is sleeved on the movable push rod, and a portion of the movable push rod structure is disposed within the through hole; and
[0008] An elastic member, one end of which is connected to the inner wall of the shell, and one end of which is away from the shell is connected to the mover push rod, and the elastic member is used to apply a pulling force opposite to the movement direction of the mover push rod to the mover push rod.
[0009] Optionally, the elastic member includes a mounting ring, a stretching ring and a connecting ring, the mounting ring is connected to the inner wall of the outer shell, the stretching ring is stretchably connected to the mounting ring, the connecting ring is connected to one end of the stretching ring away from the mounting ring, and the movable push rod is connected to the connecting ring.
[0010] Optionally, a snap ring groove for snapping with the mounting ring is formed on the inner wall of the housing, and a sleeve ring groove for snapping with the connecting ring is formed on the outer peripheral wall of the mover push rod.
[0011] Optionally, air holes are provided on the peripheral wall of the stretch ring.
[0012] Optionally, the elastic member further includes a support member, which is provided at one end of the stretch ring away from the mounting ring, and is used to support the stretch ring so as to form a gap between the stretch ring and the mover push rod.
[0013] Optionally, the mover push rod includes a mover front shaft and a mover rear shaft, and the mover front shaft is fixedly connected to the mover rear shaft; the through holes are opened at both ends of the outer shell, and the through hole in front of the pushing direction of the mover push rod is defined as the front hole, and the through hole in front of the pushing direction of the mover push rod is defined as the rear hole, and the mover front shaft is slidably connected to the inner circumferential wall of the front hole.
[0014] Optionally, the mounting ring is connected to the inner wall of the housing close to the front hole, and the connecting ring is connected to the front shaft of the mover; or,
[0015] The mounting ring is connected to the inner wall of the housing close to the rear hole, and the connecting ring is connected to the rear shaft of the mover.
[0016] Optionally, the silent linear motor includes two elastic parts, the mounting ring and the connecting ring of one elastic part are respectively connected to the inner wall of the shell near the front hole and the front axis of the mover, and the mounting ring and the connecting ring of the other elastic part are respectively connected to the inner wall of the shell near the rear hole and the rear axis of the mover.
[0017] Optionally, the mover push rod is formed with a stop ring, and the stop ring is located in the movement cavity; the outer diameter of the stop ring is larger than the inner diameter of the through hole.
[0018] Optionally, the coil assembly further includes a plurality of coils and a plurality of positioning rings, with a positioning ring being provided between each two adjacent coils; and an outer peripheral wall of each positioning ring abuts against an inner peripheral wall of the housing.
[0019] In the technical solution of the present utility model, the silent linear motor includes a shell, a magnetic induction component and an elastic member, and the shell is provided with a through hole; the magnetic induction component includes a coil group, a magnetic ring and a mover push rod, and the coil group is arranged in the shell and enclosed with the shell to form a motion cavity; the magnetic ring and the mover push rod are both located in the motion cavity, the magnetic ring is sleeved on the mover push rod, and part of the structure of the mover push rod is passed through the through hole; one end of the elastic member is connected to the inner wall of the shell, and the end of the elastic member away from the shell is connected to the mover push rod, and the elastic member is used to apply a pulling force to the mover push rod that is opposite to the movement direction of the mover push rod. In the technical solution of the present invention, the movable push rod reciprocates in the outer shell, and the elastic member applies a pulling force to the movable push rod in the opposite direction of the movement direction of the movable push rod due to its own elastic force; in the process of pushing out or retracting the movable push rod, when the protruding part of the structure on the movable push rod approaches the inner wall of the outer shell, the elastic member is stretched to the limit. At this time, the pulling force exerted on the movable push rod by the elastic member due to its own elastic force can be balanced with the thrust of the magnetic ring exerted on the movable push rod, thereby preventing the protruding part of the structure on the movable push rod from continuing to push out or retract; the elastic force generated by the stretching of the elastic member itself is used to prevent the protruding structure of the movable push rod from impacting the inner wall of the outer shell, and at the same time, there is no need to configure a shock absorber or spring to buffer the movable push rod, thereby further reducing the noise generated by the linear motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0021] Figure 1 This is a structural diagram of an embodiment of the silent linear motor provided by the utility model;
[0022] Figure 2 This is a schematic diagram of the structure of the elastic part in the silent linear motor;
[0023] Figure 3 This is a schematic diagram of the structure of the mover push rod in a silent linear motor.
[0024] Description of Figure Numbers:
[0025] 1000 Silent linear motor 23a Socket ring groove 1 shell 231 Mover front axle 1a front hole 232 Mover rear axle 1b rear hole 23b Stop ring 21 Coil assembly 3 elastic parts 21a Movement cavity 31 Mounting ring 211 Coil 32 Stretch ring 212 locating ring 32a pores 22 Magnetic ring 33 Connecting ring 23 Mover push rod 34 Support
[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not the complete embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the rings in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0029] In addition, the descriptions of "first", "second", etc. in the present utility model are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0030] Please refer to Figure 1 In order to solve the problem of excessive noise of linear motors, the utility model proposes a silent linear motor 1000, comprising:
[0031] The shell 1, the magnetic induction component and the elastic member 3, the shell 1 is provided with a through hole; the magnetic induction component includes a coil group 21, a magnetic ring 22 and a movable push rod 23, the coil group 21 is arranged in the shell 1, and is enclosed with the shell 1 to form a motion cavity 21a; the magnetic ring 22 and the movable push rod 23 are both located in the motion cavity 21a, the magnetic ring 22 is sleeved on the movable push rod 23, and part of the structure of the movable push rod 23 is passed through the through hole; one end of the elastic member 3 is connected to the inner wall of the shell 1, and the end of the elastic member 3 away from the shell 1 is connected to the movable push rod 23, and the elastic member 3 is used to apply a pulling force to the movable push rod 23 that is opposite to the movement direction of the movable push rod 23.
[0032] In the technical solution of the present invention, the movable push rod 23 reciprocates in the outer shell 1, and the elastic member 3 applies a pulling force opposite to the movement direction of the movable push rod 23 due to its own elastic force; in the process of pushing the movable push rod 23 out or retracting, when the protruding part of the structure on the movable push rod 23 approaches the inner wall of the outer shell 1, the elastic member 3 is stretched to the limit. At this time, the pulling force exerted on the movable push rod 23 by the elastic member 3 due to its own elastic force can be balanced with the thrust of the magnetic ring 22 exerted on the movable push rod 23, thereby preventing the protruding part of the structure on the movable push rod 23 from continuing to push out or retract; thereby, the elastic force generated by the stretching of the elastic member 3 itself can prevent the protruding structure of the movable push rod 23 from impacting the inner wall of the outer shell 1, and at the same time, there is no need to configure a shock absorber or spring to buffer the movable push rod 23, thereby further reducing the noise generated by the linear motor.
[0033] It is worth noting that the "silent" in the name of this utility model does not mean that no sound is generated in the physical sense (friction or collision will inevitably occur between the components of the linear motor), but means that people cannot hear the noise generated by the silent linear motor 1000 outside a smaller range. Therefore, the "silent" in the name of this utility model has the same meaning as the "silent" in "silent pistol".
[0034] The elastic member 3 may be made of silicone, rubber, or other elastic materials, which is not limited here.
[0035] The shape of the elastic member 3 can be a strip, a ring, or other shapes, which are not limited here. Figure 2 In one embodiment of the present invention, the elastic member 3 includes a mounting ring 31, a stretching ring 32, and a connecting ring 33. The mounting ring 31 is connected to the inner wall of the housing 1, the stretching ring 32 is stretchably connected to the mounting ring 31, the connecting ring 33 is connected to the end of the stretching ring 32 away from the mounting ring 31, and the mover push rod 23 is connected to the connecting ring 33. The elastic member 3 is annular in shape, which can ensure that the elastic member 3 can maintain its two ends connected to the housing 1 and the mover push rod 23 even when deformed by elastic force; at the same time, the annular design can also balance the tension applied by the elastic member 3 to various positions on the outer wall of the mover push rod 23, thereby maintaining the structure of the silent linear motor 1000 stable, which is conducive to the mover push rod 23 maintaining stable reciprocating motion; therefore, the elastic member 3 is preferably annular in shape.
[0036] The connection between the mounting ring 31 in the elastic member 3 and the housing 1, and between the connecting ring 33 and the mover push rod 23 can be either adhesive or snap-fit. Figure 1 、 Figure 2 as well as Figure 3In one embodiment of the present invention, a snap ring groove is formed on the inner wall of the housing 1 to be snap-fitted with the mounting ring 31, and a sleeve ring groove 23a is formed on the outer peripheral wall of the movable push rod 23 to be snap-fitted with the connecting ring 33. Compared with the bonding method, the snap connection can make the connection structure between the mounting ring 31 and the housing 1, and the connecting ring 33 and the movable push rod 23 more stable, and will not easily loosen the connection structure due to the elastic stretching of the elastic member 3; at the same time, the snap connection makes it easier to assemble and disassemble the mounting ring 31 and the housing 1, and the connecting ring 33 and the movable push rod 23. In summary, snap connection is the preferred connection method between the mounting ring 31 and the housing 1, and the connecting ring 33 and the movable push rod 23.
[0037] Please refer to Figure 2 In one embodiment of the present invention, air holes 32a are provided on the peripheral wall of the stretch ring 32. During the movement of the movable push rod 23, the stretch ring 32 may be driven by the movable push rod 23 to fold. When folding, the ring walls of the stretch ring 32 may contact each other and cause friction, thereby generating noise. The air holes 32a provided on the peripheral wall of the stretch ring 32 can reduce the probability of the ring walls of the stretch ring 32 contacting each other when folding, thereby reducing the probability of the stretch ring 32 generating noise to a certain extent. At the same time, the presence of the air holes 32a allows the air in the motion chamber 21a to circulate with the outside world, which helps to dissipate heat during the operation of the silent linear motor 1000, thereby improving the heat dissipation efficiency of the motor. In addition, the design of the air holes 32a can prevent air from being compressed inside the elastic member 3, thereby reducing the resistance encountered by the movable push rod 23 when moving forward or backward, helping to improve the working efficiency of the silent linear motor 1000 and reducing the additional load on the silent linear motor 1000 caused by air compression.
[0038] The stretch ring 32 is prone to folding when it is driven by the push rod 23. When folding, the end of the stretch ring 32 away from the mounting ring 31 is prone to contact with the push rod 23 and friction to produce noise. To solve this problem, please refer to Figure 1 In one embodiment of the present invention, the elastic member 3 further includes a support member 34, which is disposed at the end of the stretch ring 32 away from the mounting ring 31. The support member 34 is used to support the stretch ring 32 so as to form a gap between the stretch ring 32 and the movable push rod 23. The support member 34 supports the stretch ring 32 so that the end of the stretch ring 32 away from the mounting ring 31 maintains a distance from the movable push rod 23, thereby preventing the stretch ring 32 from contacting and rubbing with the movable push rod 23 and generating noise, further reducing the noise generated by the linear motor.
[0039] Please refer to Figure 1In one embodiment of the present invention, the mover push rod 23 includes a front mover shaft 231 and a rear mover shaft 232, with the front mover shaft 231 and the rear mover shaft 232 being fixedly connected. Through holes are formed at both ends of the housing 1. The through hole closer to the front of the push rod 23 in the direction of ejection is defined as the front hole 1a, and the through hole closer to the front of the push rod 23 in the direction of ejection is defined as the rear hole 1b. The mover front shaft 231 is slidably connected to the inner peripheral wall of the front hole 1a. The inner peripheral wall of the front hole 1a limits the mover front shaft 231, preventing the mover front shaft 231 from shifting in the direction of motion during reciprocating motion, thereby ensuring stable operation of the mover push rod 23 in the direction of motion. Furthermore, the mover push rod 23 and the magnetic ring 22 are suspended in the motion cavity 21a, eliminating frictional resistance between the magnetic ring 22 and the housing 1 or the coil assembly 21, thereby improving the output efficiency of the silent linear motor 1000.
[0040] It can be understood that the silent linear motor 1000 includes at least one elastic member 3 .
[0041] When the silent linear motor 1000 includes an elastic member 3, the mounting ring 31 of the elastic member 3 can be connected to the inner wall of the outer shell 1 near the front hole 1a, and the connecting ring 33 is connected to the front shaft 231 of the mover, or the mounting ring 31 of the elastic member 3 can be connected to the inner wall of the outer shell 1 near the rear hole 1b, and the connecting ring 33 is connected to the rear shaft 232 of the mover.
[0042] When the silent linear motor 1000 includes two elastic parts 3, the mounting ring 31 and the connecting ring 33 of one elastic part 3 are respectively connected to the inner wall of the housing 1 near the front hole 1a and the front shaft 231 of the mover, and the mounting ring 31 and the connecting ring 33 of the other elastic part 3 are respectively connected to the inner wall of the housing 1 near the rear hole 1b and the rear shaft 232 of the mover.
[0043] Please refer to Figure 1 and Figure 3 In one embodiment of the present invention, the movable push rod 23 is formed with a stop ring 23b, which is located within the movement cavity 21a. The outer diameter of the stop ring 23b is larger than the inner diameter of the through hole. Because the outer diameter of the stop ring 23b is larger than the inner diameter of the mounting hole, the stop ring 23b cannot pass through the through hole and move outside the movement cavity 21a. This prevents the magnetic ring 22 and part of the movable push rod 23 from being positioned within the movement cavity 21a, thereby preventing the coil assembly 21 from pushing the movable push rod 23 and magnetic ring 22 out of the housing 1 when excessive current is drawn.
[0044] The coil assembly 21 further includes a plurality of coils 211 and a plurality of positioning rings 212. A positioning ring 212 is provided between each two adjacent coils 211. The outer peripheral wall of each positioning ring 212 abuts against the inner peripheral wall of the housing 1. Figure 1In one embodiment of the present invention, the coil assembly 21 further includes two coils 211 and a positioning ring 212. By using the positioning ring 212 to directly secure the two coils 211, the silent linear motor 1000 can reduce the air gap of the silent linear motor 1000, improve magnetic field utilization, reduce power loss, and thereby improve the efficiency and thrust of the silent linear motor 1000.
[0045] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A silent linear motor (1000), characterized in that: include: A housing (1), wherein the housing (1) is provided with a through hole; A magnetic induction component, comprising a coil group (21), a magnetic ring (22) and a movable push rod (23); the coil group (21) is arranged in the housing (1) and encloses the housing (1) to form a motion cavity (21a); the magnetic ring (22) and the movable push rod (23) are both located in the motion cavity (21a); the magnetic ring (22) is sleeved on the movable push rod (23), and a part of the structure of the movable push rod (23) is passed through the through hole; and An elastic member (3), one end of the elastic member (3) is connected to the inner wall of the housing (1), and one end of the elastic member (3) away from the housing (1) is connected to the movable push rod (23), and the elastic member (3) is used to apply a pulling force opposite to the movement direction of the movable push rod (23) to the movable push rod (23).
2. The silent linear motor (1000) according to claim 1, characterized in that The elastic member (3) comprises a mounting ring (31), a stretching ring (32) and a connecting ring (33); the mounting ring (31) is connected to the inner wall of the housing (1); the stretching ring (32) is stretchably connected to the mounting ring (31); the connecting ring (33) is connected to one end of the stretching ring (32) away from the mounting ring (31); and the movable push rod (23) is connected to the connecting ring (33).
3. The silent linear motor (1000) according to claim 2, characterized in that The inner wall of the housing (1) is formed with a snap ring groove for snapping with the mounting ring (31), and the outer peripheral wall of the movable push rod (23) is formed with a sleeve ring groove (23a) for snapping with the connecting ring (33).
4. The silent linear motor (1000) according to claim 3, characterized in that An air hole (32a) is provided on the peripheral wall of the stretching ring (32).
5. The silent linear motor (1000) according to claim 2, characterized in that The elastic member (3) further comprises a support member (34), the support member (34) being arranged at one end of the stretching ring (32) away from the mounting ring (31), the support member (34) being used to support the stretching ring (32) so as to form a gap between the stretching ring (32) and the movable push rod (23).
6. The silent linear motor (1000) according to any one of claims 2 to 5, characterized in that: The movable push rod (23) comprises a movable front shaft (231) and a movable rear shaft (232), and the movable front shaft (231) is fixedly connected to the movable rear shaft (232); both ends of the housing (1) are provided with the through holes, and the through hole closer to the front along the pushing direction of the movable push rod (23) is defined as the front hole (1a), and the through hole closer to the front along the pushing direction of the movable push rod (23) is defined as the rear hole (1b), and the movable front shaft (231) is slidably connected to the inner peripheral wall of the front hole (1a).
7. The silent linear motor (1000) according to claim 6, characterized in that The mounting ring (31) is connected to the inner wall of the housing (1) near the front hole (1a), and the connecting ring (33) is connected to the mover front shaft (231); or, The mounting ring (31) is connected to the inner wall of the housing (1) close to the rear hole (1b), and the connecting ring (33) is connected to the rear shaft (232) of the mover.
8. The silent linear motor (1000) according to claim 6, characterized in that The silent linear motor (1000) comprises two elastic members (3), wherein the mounting ring (31) and the connecting ring (33) of one elastic member (3) are respectively connected to the inner wall of the housing (1) near the front hole (1a) and the front shaft (231) of the mover, and the mounting ring (31) and the connecting ring (33) of the other elastic member (3) are respectively connected to the inner wall of the housing (1) near the rear hole (1b) and the rear shaft (232) of the mover.
9. The silent linear motor (1000) according to any one of claims 1 to 5, characterized in that: The mover push rod (23) is formed with a stop ring (23b), and the stop ring (23b) is located in the movement cavity (21a); the outer diameter of the stop ring (23b) is greater than the inner diameter of the through hole.
10. The silent linear motor (1000) according to any one of claims 1 to 5, characterized in that The coil group (21) further comprises a plurality of coils (211) and a plurality of positioning rings (212), wherein a positioning ring (212) is provided between each two adjacent coils (211); the outer peripheral wall of each positioning ring (212) abuts against the inner peripheral wall of the housing (1).