Brakes

Abstract

The present invention relates to a brake. In the present invention, a housing (10) and a housing cover (14) constitute an exterior, and a driving pin (18) is arranged to penetrate an internal space (12) of the housing (10) and perform linear motion. A permanent magnet (24) and an external iron core (26) are stacked and arranged on the inner surface of the housing (10), that is, stacked and arranged in the internal space (12). The permanent magnet (24) and the external iron core (26) are stacked in a repeated form of a combination in which permanent magnets (24) are stacked on both sides of an external iron core. An internal iron core (29) is arranged on a pin groove (28) formed on the outer surface of the driving pin (18), and a coil (30) is arranged on the outer surface of the internal iron core (29). The coil (30) is arranged to face the external iron core (26) located between the permanent magnets (24). Therefore, for one coil (30), the magnetic flux generated by two permanent magnets (24) causes the coil (30) to move, thereby generating a relatively large thrust. In addition, since the internal iron core (29) and the coil (30) are directly provided on the driving pin (18), there is an advantage that the number of components and the weight of the moving parts can be minimized.

Description

Technical Field

[0001] The present invention relates to a brake, and more particularly to a brake that uses a permanent magnet and a coil to cause a driving pin to perform linear motion. Background Art

[0002] The actuator is of a type that uses a voice coil to drive a driving pin. The actuator using a voice coil is driven by utilizing the principle that when current flows through the wire within a magnetic field, a force (Lorentz force) is generated in the wire.

[0003] That is, assuming that the magnetic field strength is B, the current flowing through the wire is i, and the length of the entire wire inside the magnetic field is L, the force F generated in the wire is:

[0004] F=BiL(N)

[0005] The direction of the force generated in the wire is perpendicular to the direction of the current flowing through the magnetic field and the wire. The direction of this force can be explained by Fleming's left-hand rule, and since this force is proportional to the number of turns n of the coil, it can be expressed as follows:

[0006] F=nBiL(N)

[0007] It can be seen from the above formula that the force generated in the wire, that is, the force of the driving pin is proportional to the current i, the number of turns n, the length L of the wire, etc.

[0008] Therefore, when designing the brake, in order to increase the force for driving the pin, it is necessary to increase the current i, the number of turns n, the length L of the wire, etc., but this will cause problems such as an increase in the size of the brake.

[0009] In addition, in the prior art, a bobbin is provided on the driving pin and a coil is provided on the bobbin, so that the driving pin and the bobbin perform linear motion together according to the interaction with the permanent magnet provided in the housing. However, when the bobbin is used, a predetermined gap is generated between the inner surface of the bobbin and the permanent magnet and between the outer surface of the bobbin and the housing, so there is a problem that the size of the entire actuator becomes larger, and there is a problem that it is difficult to manage tolerances such as the need to accurately maintain the gap. Summary of the invention

[0010] Technical issues to be solved

[0011] An object of the present invention is to solve the above-mentioned conventional problems and maximize the thrust generated by effectively arranging the permanent magnets and coils used.

[0012] Another object of the present invention is to provide a small actuator that does not use a bobbin.

[0013] Yet another object of the present invention is to facilitate tolerance management of the actuator.

[0014] Means used to solve problems

[0015] According to the characteristics of the present invention for achieving the purpose as described above, the present invention includes: a shell forming an internal space; a driving pin arranged to penetrate the center of the shell and move linearly; an internal iron core arranged on the driving pin and moving integrally with the movement of the driving pin; a coil arranged on the internal iron core and moving integrally with the driving pin; a permanent magnet arranged in the internal space of the shell and generating a magnetic force; and an external iron core arranged in the internal space, forming a moving path of the magnetic flux generated by the permanent magnet together with the internal iron core, and facing the coil arranged on the driving pin with a predetermined interval therebetween.

[0016] The inner core is disposed in a pin groove formed on an outer surface of the driving pin, and the coil is disposed on an outer surface of the inner core.

[0017] The housing is provided with a guide member to guide the movement of the driving pin.

[0018] A housing cover is disposed at one end of the housing to separate the internal space from the outside.

[0019] A washer is provided at the driving pin protruding to the outside of the housing cover, and an elastic member is provided between the washer and the housing cover, thereby providing an elastic restoring force to the driving pin when no current is applied to the coil.

[0020] The external iron core and the permanent magnet are repeatedly arranged in a combination in which the permanent magnets are arranged on both sides of the external iron core, and both side ends of the structure formed by stacking the external iron core and the permanent magnet are set as the external iron core.

[0021] Magnetic fluxes generated by permanent magnets located at both sides of the outer core pass through coils facing the outer core, respectively.

[0022] The present invention provides a brake, comprising: a shell forming an internal space; a driving pin arranged to penetrate the center of the shell and move linearly; an internal iron core arranged on the driving pin and moving integrally with the movement of the driving pin; a coil arranged on the internal iron core and moving integrally with the driving pin; a permanent magnet arranged in the internal space of the shell and generating a magnetic force; and an external iron core arranged in the internal space, forming a moving path of the magnetic flux generated by the permanent magnet together with the internal iron core, and facing the coil arranged on the driving pin in a manner separated by a predetermined interval, the internal iron core being arranged in a pin groove formed on the outer surface of the driving pin, and the coil being arranged on the outer surface of the internal iron core, the surface of the coil being exposed toward the permanent magnet, and the permanent magnet and the external iron core being arranged to surround the periphery of the coil.

[0023] The present invention provides a brake, comprising: a shell, which forms an internal space; a driving pin, which is arranged to pass through the center of the shell and move linearly; an internal iron core, which is arranged on the driving pin and moves integrally with the movement of the driving pin; a coil, which is arranged on the internal iron core and moves integrally with the driving pin; a permanent magnet, which is arranged on the inner surface of the shell and generates magnetic force; and an external iron core, which is arranged on the inner surface of the shell and forms a moving path of the magnetic flux generated by the permanent magnet together with the internal iron core, and faces the coil arranged on the driving pin in a manner separated by a predetermined interval, the internal iron core is arranged in a pin groove formed on the outer surface of the driving pin, and the coil is arranged on the outer surface of the internal iron core, the external iron core and the permanent magnet are repeatedly arranged in a combination of permanent magnets on both sides of the external iron core, and the two side ends of the structure formed by stacking the external iron core and the permanent magnet are set as the external iron core, and the coil is arranged to face the external iron core located between the two permanent magnets, and the magnetic flux generated by the permanent magnets located on both sides of the external iron core passes through the coils facing the external iron core respectively.

[0024] Effects of the Invention

[0025] The brake according to the present invention can achieve the following effects.

[0026] In the present invention, permanent magnets are arranged on both sides of an iron core, and a coil is arranged in a manner facing the iron core, so that two magnetic circuits are formed in the coil at the same time, increasing the strength of the magnetic field and increasing the force acting on the coil, thereby having the effect of increasing the thrust that operates the drive pin.

[0027] In the present invention, the core and the coil are provided on the driving pin itself, and the permanent magnet is provided on the inner surface of the housing in a manner facing the coil, so that the driving pin performs linear motion according to the interaction between the coil and the permanent magnet. As described above, the coil and the like are provided on the driving pin itself without using an additional bobbin, thereby having the effect of reducing the number of overall components and reducing the size of the actuator.

[0028] In addition, since the internal iron core and the coil are arranged on the driving pin itself and the permanent magnet and the external iron core are arranged on the inner surface of the shell, only a gap that needs to be managed is generated between the permanent magnet equivalent to the fixed part and the coil equivalent to the moving part, so the tolerance that needs to be managed is reduced, which has the effect of making the assembly work easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view showing the structure of a preferred embodiment of a brake according to the present invention.

[0030] Figure 2 1 is a structural diagram showing the relationship between the permanent magnets and coils constituting an embodiment of the present invention.

[0031] Figure 3 It is an explanatory diagram for explaining the operation for operating the driving pin in the embodiment of the present invention.

[0032] Figure 4 1 is an operational state diagram showing a state in which a driving pin protrudes from a housing in an embodiment of the present invention.

[0033] Figure 5 1 is an operational state diagram showing a state in which the drive pin is accommodated in the housing in the embodiment of the present invention. DETAILED DESCRIPTION

[0034] Hereinafter, some embodiments of the present invention are described in detail through exemplary drawings. It should be noted that when adding reference numerals to the constituent elements of each drawing, the same reference numerals are used as much as possible for the same constituent elements even if they are shown in different drawings. In addition, when describing the embodiments of the present invention, if it is determined that the specific description of the relevant known structure or function interferes with the understanding of the embodiments of the present invention, its detailed description will be omitted.

[0035] In addition, when describing the constituent elements of the embodiments of the present invention, terms such as first, second, A, B, (a), (b) and the like may be used. These terms are only used to distinguish the constituent element from another constituent element, and the nature, order or sequence of the constituent elements are not limited by the terms. It should be understood that when describing that a certain constituent element is "connected", "combined" or "connected" to another constituent element, it can be that the constituent element is directly connected or connected to the other constituent element, but it can also be that each constituent element is "connected", "combined" or "connected" to another constituent element.

[0036] As shown in the figure, the housing 10 forms the appearance of the brake according to the present invention. The housing 10 is roughly cylindrical in shape and has a cylindrical internal space 12 inside. The internal space 12 of the housing 10 is shielded by a housing cover 14. In fact, the housing cover 14 can also be regarded as a part of the housing 10. The material of the housing 10 is any material that can maintain the external strength of the actuator. The housing cover 14 can be made of the same material as the material of the housing 10, but it is not necessary. For example, the housing 10 and the housing cover 14 are preferably made of a material that is as light as possible, so that the weight of the entire actuator can be reduced. The material of the housing 10 is preferably a lighter material such as synthetic resin or aluminum.

[0037] A guide 16 for guiding the linear motion of a drive pin 18 described below may be integrally formed in the housing 10 and the housing cover 14. Although the guide 16 is formed only in the housing cover 14 in the illustrated embodiment, the guide 16 may be integrally formed in the portion of the housing 10 through which the drive pin 18 passes.

[0038] The drive pin 18 is arranged to penetrate the housing 10. The drive pin 18 penetrates the housing 10 and the housing cover 14 so that both ends are exposed to the outside. However, on the housing cover 14 side, the ends of the drive pin 18 can also be supported and exposed. The drive pin 18 is preferably made of a lightweight material to facilitate movement. An example of a material for manufacturing the drive pin 18 is aluminum. The drive pin 18 performs a linear reciprocating motion inside and outside the housing 10 under the guidance of the guide member 16.

[0039] One end of the driving pin 18 is connected to the side of the brake that uses the driving force. The other end of the driving pin 18 is provided with an elastic member 20 to provide elastic force when the driving pin 18 returns to its original position after protruding to the outside of the housing 10. One end of the elastic member 20 is supported by the housing 10, more precisely, by the housing cover 14, and the other end is supported by a washer 22 provided on the driving pin 18, thereby providing elastic force to the driving pin 18.

[0040] A permanent magnet 24 and an external iron core 26 are provided in the internal space 12 of the housing 10. In the present embodiment, the permanent magnet 24 and the external iron core 26 are both formed in a ring shape. The permanent magnet 24 and the external iron core 26 can be fixed to the housing 10 by fixing the external iron core 26 located at the uppermost side based on the drawing to the housing 10. That is, the uppermost external iron core 26 presses the permanent magnet 24 and the external iron core 26 below and is fixed to the housing 10 at the same time, thereby fixing the entire permanent magnet 24 and the external iron core 26.

[0041] In the present embodiment, the external iron core 26 and the permanent magnet 24 are arranged as follows. Two permanent magnets 24 are stacked at approximately the middle position in the length direction of the driving pin 18, and the external iron core 26 and the permanent magnet 24 are arranged in order above and below it. Based on the drawings, the external iron core 26 is arranged at the uppermost end and the lowermost end. That is, in the present invention, the combination of permanent magnets 24 arranged on both sides of one external iron core 26 is repeated, and the two side ends of the structure formed by stacking the external iron core 26 and the permanent magnet 24 are set as the external iron core 26.

[0042] Here, by setting the polarity of the permanent magnet 24 as shown in the figure, the driving pin 18 can move downward based on the figure and then move upward again. The outer core 26 forms a magnetic path through which the magnetic flux generated by the permanent magnet 24 flows.

[0043] The driving pin 18 is provided with an internal iron core 29 and a coil 30. In the illustrated embodiment, a pin groove 28 is formed around the outer surface of the driving pin 18 at a predetermined depth. The internal iron core 29 is provided in the pin groove 28. The internal iron core 29 is also formed in a ring shape. By providing the internal iron core 29 in the pin groove 28, when the driving pin 18 performs a linear motion, the internal iron core 29 does not move relative to the driving pin 18. Of course, without forming the pin groove 28, keys or washers may be provided at both ends of the driving pin 18 to fix the internal iron core 29 to the driving pin 18.

[0044] The coil 30 is arranged to surround the outer surface of the inner core 29. The coil 30 is arranged to face the outer core 26 at a predetermined interval. The coil 30 is arranged to surround the outer peripheral surface of the inner core 29. The coil 30 is also preferably arranged in a groove formed on the inner core 29. The outer shape of the coil 30 is generally annular. In this embodiment, there can be two coils 30, but it is not necessary, and more than one coil 30 is located at a position corresponding to the outer core 26.

[0045] Based on the drawings, the coil 30 is disposed at the same position as the height center of the outer core 26 facing the coil 30. Figure 1The coil 30 and the facing outer core 26 have at least the same size in the height direction, so that the magnetic flux transmitted through the outer core 26 passes through the coil 30 as a whole. Of course, the height dimension of the coil 30 can be larger than the corresponding dimension of the core 26.

[0046] The reason why the coil 30 is placed at a position corresponding to the outer core 26 is to form a path in which the magnetic flux formed by the permanent magnet 24 flows from the outer core 26 to the inner core 29, passes through the coil 30, passes through the outer core 26 again, and flows to the permanent magnet 24. Figure 2 In the present invention, since two magnetic paths are formed in one coil 30, the magnetic flux passing through the coil 30 is relatively increased.

[0047] Hereinafter, the brake according to the present invention having the structure as described above will be described in detail.

[0048] In the present invention, by passing current through the coil 30, a force is generated to move the coil 30 in the magnetic field according to Fleming's left-hand rule, thereby moving the drive pin 18. That is, the drive pin 18 further protrudes from the housing 10 to the outside by a certain length. This state is as follows: Figure 4 shown.

[0049] Furthermore, when the current applied to the coil 30 is removed, the driving pin 18 moves to the original position by the restoring force of the elastic member 20. The driving of a desired part is achieved by the actuator by performing the operation as described above. Figure 5 The driving pin 18 is shown in the state of moving to the original position.

[0050] Reference Figure 2 and Figure 3 , the operation of moving the driving pin 18 is explained. In the illustrated embodiment, a magnetic field is formed by the magnetic force of the permanent magnet 24, and magnetic flux flows to form a closed curve as shown by a solid arrow. The permanent magnet 24 is arranged in a direction such as Figure 3 Magnetic flux is generated in the direction indicated by the thick arrow.

[0051] Therefore, the magnetic flux flows through each permanent magnet 24 through the Figure 3 The quadrilateral shown represents the magnetic circuit. Figure 3 , a magnetic circuit is formed in the counterclockwise direction at the top. That is, a magnetic circuit is formed starting from the permanent magnet 24, passing through the external iron core 26, the internal iron core 29, the coil 30, the external iron core 26 and returning to the original permanent magnet 24, so that the magnetic flux flows.

[0052] The second and third permanent magnets from the top form a magnetic circuit in a clockwise direction, and the bottom permanent magnet 24 forms a magnetic circuit in a counterclockwise direction, so that magnetic flux flows. Of course, the direction of the magnetic flux can also be opposite depending on how the polarities of the permanent magnets 24 are arranged.

[0053] In this state, when current is applied to the coil 30, a force is generated to move the coil 30. Figure 3 , the coil 30 on the upper right side is applied with current in the direction perpendicular to the paper surface, and the coil 30 on the lower side is applied with current in the direction perpendicular to the paper surface. When current is applied in this manner, the coils 30 are all subjected to a force moving in the direction of arrow F, so the bobbin 28 moves while the drive pin 18 moves. This operation moves the drive pin 18 while generating a force by surrounding the entire drive pin 18 with the permanent magnet 24, the outer iron core 26, and the coil 30.

[0054] When current is applied to the coil 30 as described above, movement of the drive pin 18 occurs, and the drive pin 18 Figure 4 The state shown is relatively protruding toward the outside of the housing 10 .

[0055] And, when the current applied to the coil 30 is removed, the force according to Fleming's left-hand rule no longer acts on the coil 30, and the restoring force of the elastic member 20 acts, so that the driving pin 18 is Figure 5 The state shown moves to the original position.

[0056] In the above, although all the constituent elements constituting the embodiment of the present invention are described as being combined into one or combined operation, the present invention is not necessarily limited to this embodiment. That is, within the scope of the purpose of the present invention, all the constituent elements may also be selectively combined into more than one and operate. In addition, the terms "including", "constituting" or "having" etc. recorded above, unless otherwise specified, refer to the constituent elements that may be included, and therefore should be interpreted as also including other constituent elements rather than excluding other constituent elements. Unless otherwise specified, all terms including technical or scientific terms have the same meaning as the meaning generally understood by those of ordinary skill in the field to which the present invention belongs. As defined in the dictionary, the generally used terms should be interpreted as being consistent with the contextual meaning of the relevant technology, and unless otherwise clearly stated in the present invention, should not be understood as ideal or overly formal meanings.

[0057] The above description is only an exemplary description of the technical idea of ​​the present invention, and a person of ordinary skill in the field to which the present invention belongs may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not used to limit the technical idea of ​​the present invention but to illustrate the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by these embodiments. The protection scope of the present invention shall be interpreted by the attached claims, and all technical ideas within the equivalent scope thereof shall be understood to be included in the scope of rights of the present invention.

[0058] In the illustrated embodiment, the housing 10 , the inner space 12 , the guide 16 , the permanent magnet 24 , the outer core 26 , the inner core 29 , etc. are mostly described as having a cylindrical or ring shape, but this is not necessarily the case.

[0059] For example, the outer appearance of the housing 10 may be a hexahedron instead of a circle, and the interior of the guide member 16 may have a polygonal cross section instead of a circular cross section.

Claims

1. A brake, wherein: include: A shell body, forming an internal space; A driving pin, arranged to penetrate the center of the housing and move linearly; an internal iron core disposed on the driving pin and moving integrally with the movement of the driving pin; a coil disposed in the inner core and moving integrally with the driving pin; A permanent magnet is disposed on the inner surface of the shell and generates a magnetic force; as well as an outer iron core, which is disposed on the inner surface of the housing, forms a moving path of the magnetic flux generated by the permanent magnet together with the inner iron core, and faces the coil disposed on the driving pin with a predetermined interval therebetween, The inner iron core is disposed in a pin groove formed on an outer surface of the driving pin, and the coil is disposed on an outer surface of the inner iron core. The external iron core and the permanent magnet are repeatedly arranged in a combination of permanent magnets arranged on both sides of the external iron core, and both side ends of the structure formed by stacking the external iron core and the permanent magnet are set as the external iron core, The coil is arranged to face the outer core located between the two permanent magnets, and magnetic fluxes generated by the permanent magnets located on both sides of the outer core pass through the coils facing the outer core respectively.

2. The brake according to claim 1, wherein: The housing is provided with a guide member to guide the movement of the driving pin.

3. The brake according to claim 2, wherein: A housing cover is disposed at one end of the housing to separate the internal space from the outside.

4. The brake according to claim 3, wherein: A washer is provided at the driving pin protruding to the outside of the housing cover, and an elastic member is provided between the washer and the housing cover, thereby providing an elastic restoring force to the driving pin when no current is applied to the coil.

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