A linear motor

Abstract

The present invention discloses a linear motor, including a cover plate, a fixing seat assembly, a magnetic ring, a stainless steel sheet, a coil and a base. The cover plate is fixed on the base and the fixing seat assembly, the magnetic ring, the stainless steel sheet and the coil are assembled between the cover plate and the base. The fixing seat assembly includes a base plate, a concentric sleeve and an insert. The present invention disassembles the integral fixing seat of the existing linear motor into three parts, namely, a base plate, a concentric sleeve and an insert, and rivets them. By adding a new part, namely, a concentric sleeve, the assembly of the motor can be facilitated, the friction of the motor can be reduced, and the sound of the motor can be improved. At the same time, the thickness of the fixing seat is reduced on the basis of ensuring the strength, and the running space of the motor linear motion is increased.

Description

Technical Field

[0001] The invention relates to the technical field of seat motors, and in particular to a linear motor used for a seat. Background Art

[0002] Traditional linear motors cannot run for a long time on the seat, so they cannot provide a long-term massage effect, and traditional linear motors will produce loud friction noise when running.

[0003] See also Figure 1 The fixed seat of the existing linear motor is an integral structure with a relatively thick thickness, which reduces the space for the motor to move linearly. Figure 2 The motor base of the traditional structure is fixed with a plastic support sleeve 1 and an aluminum alloy base plate 2, which has a high manufacturing cost.

[0004] Furthermore, the vibration amplitude of traditional linear motors is not large, so the massage strength and effect are not good. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a linear motor to solve the problems of traditional linear motors such as inability to run for a long time, friction noise, small linear motion space of the motor and small vibration amplitude of the motor.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A linear motor comprises a cover plate, a fixed seat assembly, a magnetic ring, a stainless steel sheet, a coil and a base, wherein the cover plate is fixed on the base and the fixed seat assembly, the magnetic ring, the stainless steel sheet and the coil are assembled between the cover plate and the base, characterized in that the fixed seat assembly comprises a bottom plate, a concentric sleeve and an insert, wherein the bottom plate is formed by stamping and a center hole is added in the center, and an annular groove is arranged around the center hole; the concentric sleeve is formed by stamping, and the concentric sleeve has a cylindrical body part for facilitating the installation of the magnetic ring and an end wall part connected to one end of the cylindrical body part as a whole, and a hole is opened in the center of the end wall part, and the inner diameter of the hole is smaller than that of the cylindrical body The inner hole diameter of the part; the outer circle of the insert is a stepped outer cylinder, which has a first outer cylinder, a second outer cylinder and a third outer cylinder, wherein the first outer cylinder has the largest diameter, the second outer cylinder has the second largest diameter, and the third outer cylinder has the smallest diameter; during assembly, the first outer cylinder of the insert is inserted into the inner hole of the barrel part of the concentric sleeve, the third outer cylinder of the insert passes through the hole on the end wall of the concentric sleeve and is inserted into the center hole on the bottom plate, and then is riveted with the groove edge of the annular groove to form the fixed seat assembly; the coil is sleeved on the first outer cylinder of the insert; the center hole of the magnetic ring and the stainless steel sheet are sleeved on the outer diameter of the coil.

[0008] The present invention disassembles the existing integral fixing seat of the linear motor into three parts, namely, a base plate, a concentric sleeve and an insert, and rivets them together. By adding a new part, the concentric sleeve, the motor assembly can be facilitated, the friction of the motor can be reduced, and the sound of the motor can be improved. The reason is that the concentric sleeve plays a positioning and guiding role, which is convenient for installation. The concentric sleeve has a thin wall, which can increase the space between it and the winding coil, reduce friction and collision, and reduce noise.

[0009] In addition, the present invention separates the existing integral fixing seat of the linear motor into three parts, namely, a base plate, a concentric sleeve and an insert, and rivets them together, thereby reducing the thickness of the fixing seat while ensuring strength and increasing the operating space of the motor's linear motion.

[0010] In particular, the concentric sleeve thin plate is formed by stamping and stretching, and has the advantages of small size and light weight, which can avoid friction with the coil when the motor vibrates linearly, thereby improving the sound of the motor.

[0011] In a preferred embodiment of the present invention, the stainless steel sheet has an outer circle and an inner hole, and the inner hole of the stainless steel sheet is sleeved on the outer diameter of the coil; at least one radially extending mounting ear is provided on the outer circle of the stainless steel sheet, and each mounting ear is provided with at least one axially penetrating positioning hole and at least one axially penetrating mounting through hole of the stainless steel sheet; at least one axially penetrating mounting through hole of the cover plate is also provided at a position close to the outer circumference of the cover plate, and at least one axially positioning countersunk hole is provided on the end face of the cover plate corresponding to the base; At least one positioning pin and one internal screw hole are arranged on the end surface, and the internal screw hole on the base is in one-to-one correspondence with the mounting through hole on the mounting ear of the stainless steel sheet and the mounting through hole on the cover plate and is aligned; the positioning column on the base is in one-to-one correspondence with the positioning hole on the mounting ear of the stainless steel sheet and the positioning countersunk hole on the cover plate and is aligned; during installation, the positioning column is inserted into the positioning countersunk hole through the positioning hole, the cover plate and the base are circumferentially and radially positioned, and the cover plate and the base can be installed together by screwing through the corresponding mounting through hole and the mounting through hole and screwing into the internal screw hole;

[0012] In a preferred embodiment of the present invention, a plurality of annular grooves are arranged in the circumference of the stainless steel sheet, which can reduce the weight of the stainless steel sheet itself and the elasticity of the stainless steel sheet, thereby increasing the vibration amplitude of the motor operation and the performance of the motor. At the same time, by adding a plurality of annular grooves, the installation of the magnetic ring can be facilitated.

[0013] In a preferred embodiment of the present invention, the base is an integral injection-molded part, so that the weight of the part is greatly reduced, and the production and manufacturing costs of the part are reduced.

[0014] In a preferred embodiment of the present invention, a rubber ring is added between the stainless steel sheet and the base, the rubber ring is circumferentially sleeved on the outer diameter of the coil and is located inside the base; the axial end faces of the rubber ring are in contact with the bottom of the base and the axial end face of the stainless steel sheet respectively, so as to reduce the collision generated when the motor moves and reduce the noise.

[0015] Due to the adoption of the above technical solution, the present invention optimizes the structure of the internal parts of the motor through the optimization of the structural design, reduces the weight of the parts, increases the motor movement space, and improves the vibration performance of the motor without changing the function and appearance. The overall concept is to reduce the volume of the internal parts of the motor, and replace the machined parts with stamping parts and fix them to the motor by riveting, so as to reduce the volume of the motor and reduce the weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a fixed seat of an existing linear motor.

[0017] Figure 2 It is a schematic diagram of the base structure of an existing linear motor.

[0018] Figure 3 It is a schematic diagram of the decomposition of the linear motor of the present invention.

[0019] Figure 4 It is a schematic diagram of the exploded view of the fixing base of the linear motor of the present invention.

[0020] Figure 5 It is a schematic diagram of the base structure of the linear motor of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] See also Figure 2 A linear motor shown in the figure includes a cover plate 10, a fixed seat assembly 20, a magnetic ring 30, a stainless steel sheet 40, a coil 50, a rubber ring 60 and a base 70.

[0023] Special combination Figure 4 The fixing seat assembly 20 includes a bottom plate 21, a concentric sleeve 22 and an insert 23. The bottom plate 21 is formed by stamping a thin steel plate and a center hole 21a is added in the center, and an annular groove 21b is provided around the center hole 21a;

[0024] The concentric sleeve 22 is formed by stamping and stretching a thin plate, and has the advantages of small size and light weight, and can avoid friction with the coil when the motor vibrates linearly, so as to improve the sound of the motor. The concentric sleeve 22 has a cylindrical portion 22a for convenient installation of the magnetic ring 30 and an end wall portion 22b connected to one end of the cylindrical portion 22a. A hole 22ba is provided in the center of the end wall portion 22b, and the inner diameter of the hole 22ba is smaller than the diameter of the inner hole 22aa of the cylindrical portion 22a.

[0025] The outer circle of the insert 23 is a stepped outer cylinder, which has a first outer cylinder 23a, a second outer cylinder 23b and a third outer cylinder 23c, wherein the first outer cylinder 23a has the largest diameter, the second outer cylinder 23b has the second largest diameter, and the third outer cylinder 23c has the smallest diameter.

[0026] During assembly, the first outer cylinder 23a of the insert 23 is inserted into the inner hole 22aa of the barrel portion 22a of the concentric sleeve 22, and the third outer cylinder 23c of the insert 23 passes through the hole 22ba on the end wall portion 22b of the concentric sleeve 22 and is inserted into the center hole 21a on the base plate 21, and then is riveted to the groove edge 21ba of the annular groove 21b to form a fixed seat assembly 20.

[0027] The present invention disassembles the existing integral fixing seat of the linear motor into three parts, namely, the base plate 21, the concentric sleeve 22 and the insert 23, and rivets them together. By adding a new part, the concentric sleeve 22, the motor assembly can be facilitated, the friction of the motor can be reduced, and the sound of the motor can be improved. The reason is that the concentric sleeve plays a positioning and guiding role, which is convenient for installation. The concentric sleeve has a thin wall, which can increase the space between it and the winding coil, reduce friction and collision, and reduce noise.

[0028] In addition, the present invention disassembles the existing integral fixing seat of the linear motor into three parts: a base plate 21, a concentric sleeve 22 and an insert 23, and rivets them together, thereby reducing the thickness of the fixing seat while ensuring strength and increasing the operating space of the motor's linear motion.

[0029] The present invention improves the stainless steel sheet. The stainless steel sheet 40 of the present invention has an outer circle 41 and an inner hole 42. Three radially extending mounting ears 43 are evenly distributed on the outer circle 41 of the stainless steel sheet 40 (of course, it is not limited to three, and it can be one, two or more). Two positioning holes 44 axially penetrating the stainless steel sheet 40 (of course, it is not limited to two, and it can be one or more) and a mounting through hole 45 axially penetrating the stainless steel sheet 40 are provided on each mounting ear 43. The mounting through hole 45 is located between the two positioning holes 44 in the circumferential direction.

[0030] In addition, a plurality of annular grooves 46 are arranged in the circumferential direction of the stainless steel sheet 40, which can reduce the weight and elasticity of the stainless steel sheet itself, thereby increasing the vibration amplitude and performance of the motor. At the same time, by adding a plurality of annular grooves, the installation of the magnetic ring can be facilitated.

[0031] Three axial mounting through holes 11 penetrating the cover plate 10 are also circumferentially arranged near the outer circumference of the cover plate 10, and six axial positioning countersunk holes (not shown in the figure) are circumferentially opened on the end surface 12 of the cover plate 10 corresponding to the base 70. One mounting through hole 11 forms a group with two positioning countersunk holes and the mounting through hole 11 is located between the two positioning countersunk holes.

[0032] See especially Figure 5 The base 70 of the present invention is an integral injection molded part, so that the weight of the part is greatly reduced, and the production and manufacturing cost of the part is reduced. The base 70 has a bottom 71 and a ring portion 72. Six positioning pins 74 and three internal screw holes 75 are circumferentially arranged on the side 73 of the ring portion 72 facing the stainless steel sheet 40. Every two positioning pins 74 and one internal screw hole 75 form a group, and each internal screw hole 75 is located between two positioning pins 74.

[0033] During assembly, the cover plate 10 is fixed on the base 70 and the fixing base assembly 20, the magnetic ring 30, the stainless steel sheet 40, the coil 50, and the rubber ring 60 are assembled between the cover plate 10 and the base 70, specifically:

[0034] The coil 50 is fixed on the bottom 71 of the base 70 and is located in the ring 72. The lead wire 51 on the coil 50 is led out through the lead wire hole (not shown in the figure) on the ring 72. The rubber ring 60 is circumferentially sleeved on the outer diameter 52 of the coil 50 and is located in the ring 72 of the base 70; the axial end surfaces of the rubber ring 60 are respectively in contact with the bottom 71 of the base 70 and the axial end surface of the stainless steel sheet 40, so as to reduce the collision generated when the motor moves and reduce the noise.

[0035] The inner hole 42 of the stainless steel sheet 40 is put on the outer diameter 52 of the coil 50, and the six positioning pins 74 on the ring portion 72 of the base 70 pass through the positioning holes 44 on the stainless steel sheet 40 one by one, so that the stainless steel sheet 40 is positioned on the ring portion 72 of the base 70, and at the same time, the three mounting through holes 45 on the stainless steel sheet 40 are aligned one by one with the three inner screw holes 75 on the ring portion 72 of the base 70.

[0036] Next, the center hole 31 of the magnetic ring 30 is sleeved on the first outer cylinder 23 a of the insert 23 of the fixed seat assembly 20 , and then the first outer cylinder 23 a of the insert 23 of the fixed seat assembly 20 is inserted into the inner hole 53 of the coil 50 through the inner hole 42 of the stainless steel sheet 40 .

[0037] Finally, the cover plate 10 is buckled on, and the six positioning pins 74 on the ring portion 72 of the base 70 are inserted into the six positioning countersunk holes on the cover plate 10 one by one, so as to position the cover plate 10 and the base 70 circumferentially and radially.

[0038] Finally, use three screws (not shown in the figure) to pass through the corresponding mounting holes 11 of the cover plate 10 and the corresponding mounting holes 45 of the stainless steel sheet 40 and screw them into the corresponding internal screw holes 75 on the ring portion 72 of the base 70 to install the cover plate 10 and the base 70 together.

Claims

1. A linear motor, comprising a cover plate, a fixed seat assembly, a magnetic ring, a stainless steel sheet, a coil and a base, wherein the cover plate is fixed on the base and the fixed seat assembly, the magnetic ring, the stainless steel sheet and the coil are assembled between the cover plate and the base, characterized in that: The fixing seat assembly includes a base plate, a concentric sleeve and an insert. The base plate is formed by stamping and a center hole is added in the center. An annular groove is arranged around the center hole. The concentric sleeve is formed by stamping. The concentric sleeve has a cylindrical body part for convenient installation of the magnetic ring and an end wall part connected to one end of the cylindrical body part. A hole is opened in the center of the end wall part. The inner diameter of the hole is smaller than the inner diameter of the cylindrical body part. The outer circle of the insert is a stepped outer cylinder, which has a first outer cylinder, a second outer cylinder and a third outer cylinder. Outer cylinders, wherein the first outer cylinder has the largest diameter, the second outer cylinder has the second largest diameter, and the third outer cylinder has the smallest diameter; during assembly, the first outer cylinder of the insert is inserted into the inner hole of the barrel portion of the concentric sleeve, the third outer cylinder of the insert passes through the hole on the end wall portion of the concentric sleeve and into the center hole of the bottom plate, and then is riveted with the groove edge of the annular groove to form the fixing seat assembly; the coil is sleeved on the first outer cylinder of the insert; the center hole of the magnetic ring and the stainless steel sheet are sleeved on the outer diameter of the coil; The concentric sleeve thin plate is formed by stamping and stretching; The stainless steel sheet has an outer circle and an inner hole, and the inner hole of the stainless steel sheet is sleeved on the outer diameter of the coil; at least one mounting ear extending in the radial direction is arranged on the outer circle of the stainless steel sheet, and at least one positioning hole axially penetrating the stainless steel sheet and at least one mounting through hole axially penetrating the stainless steel sheet are opened on each mounting ear, and at least one mounting through hole axially penetrating the cover plate is also arranged at a position close to the outer circumference of the cover plate, and at least one axial positioning countersunk hole is opened on the end face of the cover plate corresponding to the base; a mounting hole is arranged on the end face of the base corresponding to the stainless steel sheet At least one positioning pin and one internal screw hole, the internal screw hole on the base is in a one-to-one correspondence with the mounting through-hole on the mounting ear of the stainless steel sheet and the mounting through-hole on the cover plate and are aligned; the positioning column on the base is in a one-to-one correspondence with the positioning hole on the mounting ear of the stainless steel sheet and the positioning countersunk hole on the cover plate and are aligned; during installation, the positioning column is inserted into the positioning countersunk hole through the positioning hole to position the cover plate and the base circumferentially and radially, and the cover plate and the base can be installed together by passing the corresponding mounting through-hole and the mounting through-hole and screwing the screw into the internal screw hole.

2. A linear motor according to claim 1, characterized in that: A plurality of annular grooves are arranged in the circumferential direction of the stainless steel sheet.

3. A linear motor according to claim 1, characterized in that: The base is an integral injection molded part.

4. A linear motor according to any one of claims 1 to 3, characterized in that: A rubber ring is added between the stainless steel sheet and the base. The rubber ring is circumferentially sleeved on the outer diameter of the coil and is located inside the base. The axial end faces of the rubber ring are respectively in contact with the bottom of the base and the axial end face of the stainless steel sheet.

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