Homopolar magnetic steel press-fitting device for voice coil motor and assembling method of homopolar magnetic steel press-fitting device

Abstract

The invention belongs to the field of voice coil motor design, and particularly discloses a homopolar magnetic steel press-fitting device for a voice coil motor and an assembling method thereof.The homopolar magnetic steel press-fitting device for the voice coil motor comprises a screw rod, a first screw, a second screw, a third screw, a screw rod base, a fixing base, a guide base and a base, and during assembling, cleaning and checking are conducted in sequence; installing a coil assembly, a first magnetizer, a sleeve and an end cover; fixing the motor base; pressing the first magnetic steel; pressing a second magnetizer; pressing the second magnetic steel; pressing a third magnetizer; pressing third magnetic steel; pressing a fourth magnetizer; pressing fourth magnetic steel; and a plug is installed. The press-fitting device provided by the invention is low in cost and convenient to operate, and the adopted assembling method can effectively reduce the assembling risk of the homopolar magnetic steel and avoid adsorption between the magnetic steel; the coaxiality among the multi-stage magnetic steel is effectively ensured, and the assembly quality is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of voice coil motor design, and in particular relates to a homopolar magnetic steel press-fitting device for a voice coil motor and an assembling method thereof. Background Art

[0002] As voice coil motors are used more and more widely, the performance requirements for voice coil motors are getting higher and higher, resulting in a variety of magnetic circuit structures with multiple magnet arrangements, such as structures with magnets of the same polarity. This is because the mutual repulsion of magnets of the same polarity is very strong, and anisotropic adsorption is likely to occur between the magnets, which can easily cause damage to the magnets and injuries to operators, making assembly difficult. In addition, the magnetic circuit composed of magnets of the same polarity and the magnetizer requires close contact between the magnets and the magnetizer. If there is a gap, the energy efficiency of the magnetic circuit is seriously affected. Therefore, in the process of pressing the magnets of the same polarity, a reliable magnet pressing device and a more demanding assembly method are required to ensure assembly quality and efficiency. Summary of the invention

[0003] Purpose of the invention: In order to solve the above-mentioned problems, the purpose of the present invention is to provide a press-fitting device for homopolar magnetic steel for voice coil motor and an assembly method thereof. The press-fitting device is composed of a base, a guide seat, a fixed seat, a screw seat, a screw, and a screw tooling. The magnetic steel and the magnetizer are pressed into a thin-walled sleeve in the form of a same-level arrangement one by one by a press-fitting method to complete the magnetic circuit assembly of the voice coil motor.

[0004] Technical solution: To achieve the above-mentioned purpose, the embodiment of the same-polarity magnetic steel press-fitting device of the present invention adopts the following technical solution:

[0005] A homopolar magnetic steel press-fitting device for a voice coil motor comprises: a screw, a first screw, a second screw, a third screw, a screw seat, a fixing seat, a guide seat, and a base;

[0006] The screw seat is installed on the fixing seat through a plurality of third screws, the fixing seat is installed on the guide seat through a plurality of second screws, the guide seat is connected with the base through a plurality of first screws, and a screw is installed in the middle of the screw seat.

[0007] Furthermore, one end of the screw rod has a square cross section and the other end has a circular cross section; wherein the circular cross section end is used to tighten the magnetic steel and the magnet conductor to be assembled, and the square cross section end is used to apply torque.

[0008] Furthermore, four setscrew holes are provided on four side surfaces of the fixing seat.

[0009] Furthermore, a chamfer is provided at the left end of the inner hole of the guide seat.

[0010] Furthermore, the screw rod, the first screw, the second screw, the third screw, the screw rod seat, the fixing seat, the guide seat and the base are all non-magnetic.

[0011] Furthermore, based on the homopolar magnetic steel press-fitting device, the present invention also provides a homopolar magnetic steel assembly method for a voice coil motor, through which the coil assembly, the motor base, the end cover, the sleeve, the fourth magnetic steel, the fourth magnet conductor, the third magnetic steel, the third magnet conductor, the second magnetic steel, the second magnet conductor, the first magnetic steel, and the first magnet conductor are assembled together, and the specific steps are as follows:

[0012] S1: Clean and inspect the components of the motor structure to be assembled;

[0013] S2: Install the coil assembly, the first magnetic conductor, the sleeve, and the end cap

[0014] Install the coil assembly into the three-leaf groove in the motor base so that the coil assembly can move in a axial direction but cannot rotate. Fit the sleeve on the outer circle of the first magnetizer by interference fit. Install the first magnetizer with the sleeve in the inner hole of the motor base through the inner cylindrical surface. Install the end cover into the inner hole of the motor base so that the four threaded clearance holes of the end cover and the four threaded clearance holes on the motor base are aligned.

[0015] S3: Fixed motor seat

[0016] Based on the same-polar magnetic steel press-fitting device, the motor seat with the coil assembly, the end cover, the first magnetic conductor, and the sleeve installed is fixed between the base and the guide seat by four first screws, and the first screws pass through four threaded clearance holes on the end cover and the motor seat;

[0017] S4: Press-fit the first magnetic steel

[0018] Loosen the second screw to separate the fixing seat from the guide seat, screw the cylindrical end of the screw into the screw seat, install the first magnetic steel into the inner hole of the fixing seat, with the N pole of the first magnetic steel facing the first magnetic conductor, tighten the set screw in the set screw hole, clamp the first magnetic steel, and then tighten the second screw to fix the fixing seat to the guide seat, then loosen the set screw in the set screw hole, rotate the screw, so that the screw pushes the first magnetic steel and presses it to the bottom;

[0019] S5: Press-fit the second magnetic conductor

[0020] Loosen the second screw to separate the fixing seat from the guide seat, screw the cylindrical end of the screw into the screw seat, install the second magnetic conductor into the inner hole of the fixing seat, tighten the set screw in the set screw hole, clamp the second magnetic conductor, and then tighten the second screw to fix the fixing seat to the guide seat, then loosen the set screw in the set screw hole, rotate the screw, so that the screw pushes the second magnetic conductor and presses it to the bottom;

[0021] S6: Press-fit the second magnetic steel

[0022] Repeat step S4, replace the first magnetic steel with the second magnetic steel, and the S pole of the second magnetic steel faces the second magnetic conductor;

[0023] S7: Press-fit the third magnetic conductor

[0024] Repeat step S5, replacing the second magnetic conductor with a third magnetic conductor;

[0025] S8: Press-fit the third magnetic steel

[0026] Repeat step S4, replace the first magnetic steel with a third magnetic steel, and the N pole of the third magnetic steel faces the third magnetic conductor;

[0027] S9: Press-fit the fourth magnetic conductor

[0028] Repeat step S5, replacing the second magnetic conductor with a fourth magnetic conductor;

[0029] S10: Press-fit the fourth magnetic steel

[0030] Repeat step S4, replace the first magnetic steel with a fourth magnetic steel, and place the S pole of the fourth magnetic steel toward the fourth magnetic conductor;

[0031] S11: Loading jam

[0032] Loosen the first screw, separate the guide seat and the base, install the plug in the end cover, and the assembly is completed.

[0033] Compared with the existing same-pole magnetic steel press-fitting device and assembly method for voice coil motor, the present invention has low device cost and convenient operation. The assembly method can effectively reduce the risk of same-pole magnetic steel assembly, avoid adsorption between magnetic steels, effectively ensure the coaxiality between multi-level magnetic steels, and significantly improve the assembly quality and efficiency. Through the ingenious design of structure and method, the present invention can quickly press-fit multiple magnetic steels and magnetizers together seamlessly and safely, eliminating the complex gluing process and the process of opening holes in magnetic steel magnetizers and connecting with bolts in the traditional assembly process. In addition, the reverse operation based on the structure and assembly method can also non-destructively disassemble the magnetic steel magnetizers multiple times, which is convenient for the repair and maintenance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the press-fitting device;

[0035] Figure 2 is a schematic diagram of a fixed seat;

[0036] Figure 3 This is a schematic diagram of the motor magnetic steel press assembly;

[0037] Figure 4 This is a schematic diagram of the motor base.

[0038] Among them, the screw 1, the first screw 2, the second screw 3, the third screw 4, the screw seat 5, the fixing seat 6, the guide seat 7, the base 8, the coil assembly 9, the motor seat 10, the end cover 11, the sleeve 12, the fourth magnetic steel 13, the fourth magnetic conductor 14, the third magnetic steel 15, the third magnetic conductor 16, the second magnetic steel 17, the second magnetic conductor 18, the first magnetic steel 19, and the first magnetic conductor 20. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the present invention is described in detail below in conjunction with the drawings or specific implementation cases of the specification. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described and these examples should not be understood as being limited to the examples set forth herein. On the contrary, these examples are described so that the positive effects of the present invention are more reflected, and any parts not detailed in the text are regarded as known techniques or conventional technical means in the art.

[0040] See attached Figures 1 to 4 The embodiment of the present invention provides a press-fit device for homopolar magnetic steel for a voice coil motor and an assembly method thereof. The press-fit device is composed of a base, a guide base, a fixing base, a screw base, a screw, and a screw tooling. The magnetic steel and the magnetizer are pressed into a thin-walled sleeve in the form of a homopolar arrangement in sequence by a press-fitting method, thereby completing the assembly of the magnetic steel of the voice coil motor.

[0041] In order to achieve the above-mentioned purpose, the embodiment of the same-polarity magnetic steel press-fitting device in the present invention adopts the following technical scheme:

[0042] A homopolar magnetic steel press-fitting device for a voice coil motor, such as Figure 1 As shown, it includes: a screw 1, a first screw 2, a second screw 3, a third screw 4, a screw seat 5, a fixing seat 6, a guide seat 7, and a base 8;

[0043] The screw seat 5 is mounted on the fixing seat 6 through four third screws 4, the fixing seat 6 is mounted on the guide seat 7 through four second screws 3, the guide seat 7 is connected to the base 8 through four first screws 2, and a screw 1 is installed in the middle of the screw seat 5;

[0044] The screw 1 has a square cross section at one end and a circular cross section at the other end;

[0045] The side of the fixing seat 6 is provided with four set screw holes 6.1, such as Figure 2 As shown;

[0046] The left end of the inner hole of the guide seat 7 is provided with a chamfer to facilitate the guidance of the magnetic steel.

[0047] The screw 1, the first screw 2, the second screw 3, the third screw 4, the screw seat 5, the fixing seat 6, the guide seat 7 and the base 8 are all non-magnetic;

[0048] Based on the homopolar magnetic steel press-fitting device, the present invention also provides a homopolar magnetic steel assembly method for a voice coil motor, through which the same polar magnetic steel is assembled. Figure 3 The coil assembly 9, the motor base 10, the end cover 11, the sleeve 12, the fourth magnetic steel 13, the fourth magnetic conductor 14, the third magnetic steel 15, the third magnetic conductor 16, the second magnetic steel 17, the second magnetic conductor 18, the first magnetic steel 19, and the first magnetic conductor 20 are assembled together, and the specific steps are as follows:

[0049] S1: Cleaning and inspection

[0050] Open the oil seal packaging paper, clean the metal parts and components with clean gasoline, clean the rubber parts with anhydrous ethanol, check the N and S polarities of all magnetic steels, and ensure that the lettering on the parts is consistent with the actual measured polarity. If necessary, you can mark it with a marker pen;

[0051] S2: Install the coil assembly, the first magnetic conductor, the sleeve, and the end cap

[0052] The coil assembly 9 is installed in Figure 4 The three-leaf groove 10.2 in the motor base 10 shown in the figure allows the coil assembly to move in a axial direction but cannot rotate. The sleeve 12 is interference-fitted on the outer circle of the first magnetizer 20. The first magnetizer 20 with the sleeve 12 is installed in the inner hole 10.1 of the motor base 10 through the inner cylindrical surface. The end cover 11 is installed in the inner hole of the motor base 10 so that the four threaded clearance holes of the end cover 11 and the four threaded clearance holes on the motor base 10 are aligned.

[0053] S3: Fixed motor seat

[0054] Based on the same-pole magnetic steel press-fitting device, the motor base 10 equipped with the coil assembly 2, the end cover 11, the first magnetic conductor 20, and the sleeve 12 is fixed between the base 8 and the guide base 7 by four first screws 2, and the first screws 2 pass through four threaded clearance holes on the end cover 11 and the motor base 10;

[0055] S4: Press-fit the first magnetic steel

[0056] Loosen the second screw 3 to separate the fixing seat 6 from the guide seat 7, screw the cylindrical end of the screw rod 1 into the screw rod seat 5, install the first magnetic steel 19 into the inner hole of the fixing seat 6, with the N pole of the first magnetic steel 19 facing the first magnetic conductor 20, tighten the set screw in the set screw hole 6.1, clamp the first magnetic steel 19, and then tighten the second screw 3 to fix the fixing seat 6 and the guide seat 7, then loosen the set screw in the set screw hole 6.1, and use a square wrench to rotate the screw rod 1 so that the screw rod 1 pushes the first magnetic steel 19 and presses it to the bottom;

[0057] Screw the set screw in the set screw hole 6.1 to clamp the first magnetic steel 19, so as to ensure that the first magnetic steel 19 does not fall off during the process of installing the fixing seat 6 on the guide seat 7, and effectively ensure that the first magnetic steel 19 and the inner hole of the guide seat 7 are coaxial;

[0058] The screw 1 pushes the first magnetic steel 19 to move from the inner hole of the fixing seat 6 to the guide seat 7, passes through the gap between the sleeve 12 and the guide seat 7, and enters the sleeve 12. The gap between the sleeve 12 and the guide seat 7 is much smaller than the thickness of the first magnetic steel 19, so the first magnetic steel 19 will not fall off when passing through the gap. At the same time, an outward chamfer is set in the area where the end cover 11 contacts the root of the sleeve 12. During the press-fitting process, the end of the sleeve 12 can be adaptively deformed toward the chamfer to avoid the problem of the first magnetic steel 19 entering the sleeve 12 and getting stuck due to the assembly coaxial error; the adaptively deformed end of the sleeve 12 plays a further guiding effect on the subsequent assembly of the magnetizer and the magnetic steel;

[0059] S5: Press-fit the second magnetic conductor

[0060] Loosen the second screw 3 to separate the fixing seat 6 from the guide seat 7, screw the cylindrical end of the screw rod 1 into the screw rod seat 5, install the second magnetic conductor 18 into the inner hole of the fixing seat 6, tighten the set screw in the set screw hole 6.1, clamp the second magnetic conductor 18, and then tighten the second screw 3 to fix the fixing seat 6 and the guide seat 7, then loosen the set screw in the set screw hole 6.1, and use a square wrench to rotate the screw rod 1 so that the screw rod 1 pushes the second magnetic conductor 18 and presses it to the bottom;

[0061] S6: Press-fit the second magnetic steel

[0062] Repeat step S4, replace the first magnetic steel 19 with the second magnetic steel 17, and the S pole of the second magnetic steel 17 faces the second magnetic conductor 18;

[0063] S7: Press-fit the third magnetic conductor

[0064] Repeat step S5 to replace the second magnetic conductor 18 with the third magnetic conductor 16;

[0065] S8: Press-fit the third magnetic steel

[0066] Repeat step S4, replace the first magnetic steel 19 with the third magnetic steel 15, and the N pole of the third magnetic steel 15 faces the third magnetic conductor 16;

[0067] S9: Press-fit the fourth magnetic conductor

[0068] Repeat step S5 to replace the second magnetic conductor 18 with the fourth magnetic conductor 14;

[0069] S10: Press-fit the fourth magnetic steel

[0070] Repeat step S4, replace the first magnetic steel 19 with the fourth magnetic steel 13, and the S pole of the fourth magnetic steel 13 faces the fourth magnetic conductor 14;

[0071] S11: Loading jam

[0072] Loosen the first screw 2, separate the guide seat 7 and the base 8, install the plug in the end cover 11, and the assembly is completed.

[0073] Compared with the existing same-pole magnetic steel press-fitting device and assembly method for voice coil motor, the present invention has low device cost and convenient operation. The assembly method can effectively reduce the risk of assembling same-pole magnetic steel and avoid adsorption between magnetic steels.

[0074] The above specific implementation methods or cases are only used to explain the technical solutions of the present invention, and are not intended to limit the present application. Any parts not described in detail are deemed to be conventional technical means or common knowledge in the field. It can be understood by ordinary technicians in this field that: based on the design concept of the present application, the technical solutions recorded in the aforementioned implementation methods should be adaptively modified, or some or all of the technical features therein should be replaced by equivalents. These modifications, equivalent replacements, and adaptively improved technical solutions do not depart from the technical essence of the present invention and should all be covered within the protection scope of the present application.

Claims

1. A homopolar magnetic steel press-fitting device for a voice coil motor, characterized in that: include: A screw rod (1), a first screw (2), a second screw (3), a third screw (4), a screw rod seat (5), a fixing seat (6), a guide seat (7), and a base (8); The screw seat (5) is mounted on a fixing seat (6) via a plurality of third screws (4); the fixing seat (6) is mounted on a guide seat (7) via a plurality of second screws (3); the guide seat (7) is connected to a base (8) via a plurality of first screws (2); and a screw (1) is mounted in the middle of the screw seat (5).

2. A homopolar magnetic steel press-fitting device for a voice coil motor according to claim 1, characterized in that: The screw (1) has a square cross section at one end and a circular cross section at the other end.

3. A homopolar magnetic steel press-fitting device for a voice coil motor according to claim 1, characterized in that: One end of the square cross-section of the screw rod (1) is provided with a torque wrench to drive the screw rod to rotate.

4. A homopolar magnetic steel press-fitting device for a voice coil motor according to claim 1, characterized in that: The fixing seat (6) is provided with four fixing screw holes (6.1).

5. A homopolar magnetic steel press-fitting device for a voice coil motor according to claim 1, characterized in that: A chamfer is arranged at the left end of the inner hole of the guide seat (7).

6. A homopolar magnetic steel press-fitting device for a voice coil motor according to claim 1, characterized in that: The screw rod (1), the first screw (2), the second screw (3), the third screw (4), the screw rod seat (5), the fixing seat (6), the guide seat (7) and the base (8) are all non-magnetic.

7. A method for assembling homopolar magnetic steel for a voice coil motor, comprising: using the press-fitting device as claimed in any one of claims 1 to 6 to assemble a coil assembly (9), a motor base (10), an end cover (11), a sleeve (12), a fourth magnetic steel (13), a fourth magnet conductor (14), a third magnetic steel (15), a third magnet conductor (16), a second magnetic steel (17), a second magnet conductor (18), a first magnetic steel (19), and a first magnet conductor (20), wherein: The assembly steps are: S1: Clean and inspect the components of the motor structure to be assembled; S2: Install the coil assembly, the first magnetic conductor, the sleeve, and the end cap The coil assembly (9) is installed in the three-leaf groove (10.2) in the motor base (10) so that the coil assembly can move in a axial direction but cannot rotate. The sleeve (12) is interference-fitted on the outer circle of the first magnetizer (20). The first magnetizer (20) equipped with the sleeve (12) is installed in the inner hole (10.1) of the motor base (10) through the inner cylindrical surface. The end cover (11) is installed in the inner hole of the motor base (10) so that the four threaded clearance holes of the end cover (11) and the four threaded clearance holes on the motor base (10) are directly opposite. S3: Fixed motor seat The motor base (10) on which the coil assembly (2), the end cover (11), the first magnetic conductor (20), and the sleeve (12) are installed is fixed between the base (8) and the guide base (7) by means of four first screws (2), wherein the first screws (2) pass through four threaded clearance holes on the end cover (11) and the motor base (10); S4: Press-fit the first magnetic steel Loosen the second screw (3) to separate the fixing seat (6) from the guide seat (7), screw the cylindrical end of the screw rod (1) into the screw rod seat (5), install the first magnetic steel (19) into the inner hole of the fixing seat (6), with the N pole of the first magnetic steel (19) facing the first magnetic conductor (20), tighten the set screw in the set screw hole (6.1), clamp the first magnetic steel (19), and then tighten the second screw (3) to fix the fixing seat (6) and the guide seat (7), then loosen the set screw in the set screw hole (6.1), rotate the screw rod (1), so that the screw rod (1) pushes the first magnetic steel (19) and presses it to the bottom; S5: Press-fit the second magnetic conductor Loosen the second screw (3) to separate the fixing seat (6) from the guide seat (7), screw the cylindrical end of the screw rod (1) into the screw rod seat (5), install the second magnetic conductor (18) into the inner hole of the fixing seat (6), tighten the set screw in the set screw hole (6.1), clamp the second magnetic conductor (18), and then tighten the second screw (3) to fix the fixing seat (6) and the guide seat (7), then loosen the set screw in the set screw hole (6.1), rotate the screw rod (1), so that the screw rod (1) pushes the second magnetic conductor (18) and presses it to the bottom; S6: Press-fit the second magnetic steel Repeat step S4, replace the first magnetic steel (19) with the second magnetic steel (17), and the S pole of the second magnetic steel (17) faces the second magnetic conductor (18); S7: Press-fit the third magnetic conductor Repeat step S5, replacing the second magnetic conductor (18) with the third magnetic conductor (16); S8: Press-fit the third magnetic steel Repeat step S4, replace the first magnetic steel (19) with the third magnetic steel (15), and the N pole of the third magnetic steel (15) faces the third magnetic conductor (16); S9: Press-fit the fourth magnetic conductor Repeat step S5, replacing the second magnetic conductor (18) with a fourth magnetic conductor (14); S10: Press-fit the fourth magnetic steel Repeat step S4, replace the first magnetic steel (19) with the fourth magnetic steel (13), and the S pole of the fourth magnetic steel (13) faces the fourth magnetic conductor (14); S11: Loading jam Loosen the first screw (2), separate the guide seat (7) and the base (8), install the plug in the end cover (11), and the assembly is completed.

8. A method for assembling homopolar magnetic steel for a voice coil motor as claimed in claim 7, characterized in that: An outward chamfer is provided in the area where the end cover (11) contacts the root of the sleeve (12), and during the press-fitting process, the end of the sleeve (12) can adaptively deform toward the chamfer.

9. A method for assembling homopolar magnetic steel for a voice coil motor as claimed in claim 7, characterized in that: In step S1, the oil seal packaging paper is opened, the metal parts and components are cleaned with clean gasoline, the rubber parts are cleaned with anhydrous ethanol, and the N and S polarities of all magnetic steels are checked to ensure that the lettering on the parts is consistent with the actual measured polarity.

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