KR101004535B1 - Rotation angle sensor - Google Patents

Abstract

The present invention relates to a rotation angle sensor, and more particularly, in a rotation angle sensor for checking a rotation angle displacement of a continuously changing rotor, magnetizing the permanent magnet before coupling the permanent magnet to the rotation axis, combined rotation axis And by providing a coating on the outer side of the permanent magnet, to reduce the man-hours, improve the management, and relates to a rotation angle sensor that can improve the waterproof effect and product protection effect.

The present invention forms a covering on the outer surface of the permanent magnet and completely surrounds the outside, thereby preventing contact or short between the permanent magnet and various elements therein, thereby preventing failure or malfunction of the product. In addition, the present invention is to combine the permanent magnet pre-magnetized on the outside of the rotating shaft, to facilitate the manufacturing assembly process, and has the effect of simplifying the further process.

Description

Rotary Position Sensor with Magnetic

The present invention relates to a rotation angle sensor, and more particularly, in a rotation angle sensor for checking a rotation angle displacement of a continuously changing rotor, magnetizing the permanent magnet before coupling the permanent magnet to the rotation axis, combined rotation axis And by providing a coating on the outer side of the permanent magnet, to reduce the man-hours, improve the management, and relates to a rotation angle sensor that can improve the waterproof effect and product protection effect.

In general, the rotation angle sensor is used to apply the physical variation of the continuously changing rotor in an electrical circuit. It is used to control the opening amount of the engine throttle valve of a transport vehicle, the rotation angle of the steering shaft, and the control of the electronic accelerator pedal. It is also used for position control of heavy machinery and agricultural machinery and for measuring opening and closing of fluid transfer valves.

Recently, the rotation angle sensor in the automobile industry is mainly used for safe and comfortable vehicle operation such as driving dynamic regulation, for example, an electrically assisted steering system, and accordingly, the demand for high precision and robust rotation angle sensor is steadily increasing. Adding.

Such rotation angle sensors include an electric resistance type, a code plate encoder type, a hall sensor type, a magnetic type, a magnetic type, and the like, and recently used rotation angle sensors use a permanent magnet as a rotating body generating a displacement angle. It is common to measure the degree of rotation angle by measuring the voltage induced in the Hall element by using the Hall element as the intensity of the magnetic field.

The rotation angle sensor detects the magnetic force of the permanent magnet in the Hall element according to the minute magnetic field change generated by the rotation of the permanent magnet, and generates different output voltages. Inflows may cause short circuits and errors, requiring measures to block them.

In addition, in general, the part that will be permanent magnet to the rotating shaft in advance, and the whole part has been used to magnetize (magnetization), but it is very difficult to magnetize the end of the long shape of the rotating shaft to increase the number of work As a result, manufacturing costs have increased.

The present invention is to solve the problems of the prior art as described above, to form a covering on the outer surface of the permanent magnet of the rotating shaft to completely cover the outside and to break the product by blocking the contact or short between the permanent magnet and the various elements therein Another object of the present invention is to provide a rotation angle sensor that blocks a malfunction.

In addition, an object of the present invention is to provide a rotation angle sensor by coupling a permanent magnet pre-magnetized to the outside of the rotating shaft, to facilitate the manufacturing assembly process, and to simplify the additional process.

The configuration of the present invention for achieving the above object, a rotating body connected to the object to rotate, a rotating shaft connected to one side of the rotating body, a permanent magnet rotated together with the rotating shaft, and the magnetic field of the permanent magnet rotated In the rotation angle sensor including a printed circuit board having a sensing unit for detecting a change in direction, the permanent magnet is magnetized before being coupled to the rotating shaft, characterized in that the magnetized permanent magnet is coupled to the rotating shaft.

It characterized in that it further comprises a coating formed in the state in which the permanent magnet is coupled to the rotating shaft.

The coating part is formed by an injection molding method in which the permanent magnet is coupled to the rotary shaft, and a part or all of the peripheral part in which the permanent magnet is located among the injection molds for forming the coating part is formed of a nonmagnetic material. Characterized in that.

The permanent magnet is characterized in that the ring. The permanent magnet is characterized in that the disk-shaped or cylindrical or cylindrical.

The present invention forms a covering on the outer surface of the permanent magnet and completely surrounds the outside, thereby preventing contact or short between the permanent magnet and various elements therein, thereby preventing failure or malfunction of the product.

In addition, the present invention is to combine the permanent magnet pre-magnetized on the outside of the rotating shaft, to facilitate the manufacturing assembly process, and has the effect of simplifying the further process.

Hereinafter, a rotation angle sensor according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in more detail.

1 is a perspective view showing a rotation angle sensor according to a preferred embodiment of the present invention, Figure 2 is a plan view showing a rotation angle sensor according to a preferred embodiment of the present invention.

1 and 2, the rotation angle sensor of the present invention is a penetrating position located on one side of the rotating body 2 and the rotating body 2 is connected to the object to rotate and rotates by the rotation of the rotating body (2) It comprises a rotating shaft 4 and a housing 10 in which the rotating shaft 4 is penetrated and seated so that the rotating body 2 is rotated upward.

And the inside of the housing 10 at the bottom of the permanent magnet (6) to sense the change in the magnetic field direction of the permanent magnet (6 shown in Figure 3) and the rotating permanent magnet 6 rotates with the rotating shaft (4) And a printed circuit board (PCB) 7 (shown in FIG. 3) having Hall elements 8 (shown in FIG. 3) spaced below it. And the connector 17 is formed on the outer portion of the housing 10, the external connector is configured to be connected to the connector 17.

3 is a view showing a rotation angle sensor according to a preferred embodiment of the present invention. Referring to the drawings, a rotation angle sensor having a magnetic body 50 according to a preferred embodiment of the present invention includes a housing 10, the housing 10 having a body 12, an upper cover 20, and a lower cover. (30).

The main body 12 is provided with a space therein so that the rotor 2, the permanent magnet 6 and the printed circuit board 7 is provided, the upper side and the lower side are formed to be open. The inner space of the main body 12 is divided into two spaces by the division part 15. That is, the rotating part 13 is provided above the inside of the main body 12, and the receiving part 14 is provided below the inside of the main body 12, and the splitting part 13 is disposed between the rotating part 13 and the receiving part 14. 15) is located.

Then, the rotating shaft 4 and the permanent magnet 6 are accommodated in the pivoting portion 13 inside the main body 12 through the open upper side of the main body 12, and the printed circuit through the open lower side of the main body 12. The substrate 7 is accommodated in the receiving portion 14 inside the main body 12.

The upper cover 20 is positioned above the open body 12, and is positioned on the upper side of the upper cover 20 so that the rotor 2 is rotatable. The lower cover 30 is coupled to the lower side of the main body 12 to seal the lower side of the open main body 12, wherein a sealing member 40 is provided between the main body 12 and the lower cover 30. .

The sealing member 40 is such that the lower edge 16 of the main body 12 and the upper edge 32 of the lower cover 30 are tightly coupled to each other in close contact with each other, and the outer side of the edge 16 of the main body 12 is lowered. Located in the guide groove 33 formed inside the edge 32 of the cover 30, when the edge 32 of the lower cover 30 is coupled to each other, the inside of the edge 16 of the body 12 is sealed One side of the member 40 is in close contact, the other side of the sealing member 40 is in close contact with the guide groove 33 formed inside the edge 32 of the lower cover 30, the lower cover 30 and the main body It is configured to prevent water or other moisture from penetrating between (12). And the material of the sealing member 40 is preferably made of an elastic material such as rubber having easy adhesion or watertight shrinkage or expansion.

In addition, the rotation shaft 4 penetratingly positioned at one side of the rotating body 2 is accommodated in the pivot 13 located at one side thereof through the upper cover 20 and positioned inside the main body 12. And the permanent magnet 6 is located on one side of the rotary shaft 4, the permanent magnet 6 is rotated by the rotation of the rotary shaft 4, the Hall element 8 located on the upper surface of the printed circuit board (7) Generates magnetic force, and the Hall element 8 generates different output voltages according to the magnetic force.

Conventionally, the rotating shaft 4 and the permanent magnet 6 were integrated. That is, the process of inserting the metal before the magnetization into the rotating shaft 4 or forming as part of the rotating shaft 4 before magnetizing and magnetizing the end of the rotating shaft 4 together with the rotating shaft 4 is performed. It was. However, this magnetization method has a disadvantage in that the process is complicated and laborious. That is, in order to magnetize, the polarity (N, S) should be applied and the magnetism should be applied along the direction. In order to magnetize to the left and right of the end of the rotating shaft (4), precise work has to be handled in that it needs to be carefully handled. Was required. In addition, when combined with the rotating shaft (4) to try to apply the conventional upper and lower magnetization method, jig production was also difficult.

The present invention is characterized in that the permanent magnet 6, which is magnetized left and right in a ring, disc, or cylinder or cylinder, is coupled to the rotary shaft 4, rather than magnetized in the finished product combined with the rotary shaft 4 ,. do. Particularly, in the case of the left and right magnetized finished permanent magnet 6, the N pole and the S pole can be marked in advance at the time of manufacture, so there is an advantage in that the coupling needs to be made precisely without adding a complicated process for the polarity formation accuracy. .

Figure 4 is a view showing a permanent magnet of the rotation angle sensor of the present invention. Referring to FIG. 4, the permanent magnet 6 may have a ring-shaped structure and may use a finished product in which N poles and S poles are already magnetized on the left and right sides of the plane. (a) is sectional drawing, (b) is top view. At this time, each polarity may be divided into a color, a printed character, an intaglio character, a boundary mark, and the like.

5 is a view illustrating a state in which the permanent magnet of FIG. 4 is coupled to a rotating shaft. Referring to Figure 5, the ring-shaped permanent magnet 6 is inserted into the end of the rotation shaft (4). Rather than magnetizing the ends of the rotary shaft 4, there is an advantage that the manufacturing is easier by fitting the finished magnet permanently 6 already magnetized.

The outer portion of the permanent magnet 6 may be provided with a coating 50 made of an insulating material such as synthetic resin. The rotating shaft 4 and the permanent magnet 6 are placed in the injection mold, and the outside thereof is wrapped with the coating part 50. However, when water such as foreign matter or rainwater flows in between the electric device, such as a device for detecting a displacement angle, and the permanent magnet 6, a malfunction may be caused due to energization or a short. It has the effect of blocking the connection and preventing malfunction.

6 is a view showing another permanent magnet of the rotation angle sensor of the present invention. Referring to FIG. 6, the permanent magnet 6 is formed in a disc shape, a cylinder shape, or a cylinder shape, and the N pole and the S pole are magnetized on the left and right sides, respectively. (a) is sectional drawing, (b) is top view. At this time, each polarity may be divided into a color, a printed character, an intaglio character, a boundary mark, and the like.

7 is a view illustrating a state in which the permanent magnet of FIG. 6 is coupled to a rotating shaft. Referring to Figure 7, the end of the rotating shaft 4 is coupled to surround the edge of the permanent magnet 6, the outside is to cover the cover 50 again.

8 is a flowchart showing the steps of forming a coating part on the permanent magnet and the rotating shaft of the present invention in order. Referring to FIG. 8, first, the permanent magnet 6 is magnetized to have a completed permanent magnet 6 (S100). At this time, since the permanent magnet 6 is already magnetized in a simple shape, it is not necessary to undergo a complicated magnetization process in a state in which the permanent magnet 6 is combined with the rotary shaft 4. In addition, the finished product of the permanent magnet 6 is provided with a mark that can distinguish each polarity, the operator can easily distinguish and combine it. Alternatively, the permanent magnet 6 may be provided with a groove or a protrusion having a specific shape so as to be automatically coupled by a jig to distinguish the directionality.

The completed permanent magnet 6 is coupled to the end of the rotary shaft 4 (S200), in this state the rotary shaft 4 and the permanent magnet 6 is located in whole or in part in the mold for injection. It is preferable that all or part of the mold exerted by the magnetic force of the permanent magnet 6 is made of a material having no magnetic force, such as copper, so that the removal of the permanent magnet 6 after injection is easy. The coating part 50 is formed while the outside of the permanent magnet 6 is molded according to the injection process (S300). While the coating part 50 is cured, the rotation shaft 4 is mounted in the module of the rotation detection sensor (S400).

As described so far, the rotation angle sensor provided with the magnetic material of the present invention magnetizes the permanent magnet 6 in advance, and then couples it to the rotating shaft, thereby simplifying the manufacturing process and having the outer cover 50 disposed thereon. It has the advantage of preventing connection or short and preventing malfunction.

While the invention has been described in detail in the foregoing embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

1 is a perspective view showing a rotation angle sensor according to a preferred embodiment of the present invention.

2 is a plan view illustrating a rotation angle sensor according to a preferred embodiment of the present invention.

3 is a view showing a rotation angle sensor according to a preferred embodiment of the present invention.

Figure 4 is a view showing a permanent magnet of the rotation angle sensor of the present invention.

5 is a view illustrating a state in which the permanent magnet of FIG. 4 is coupled to a rotating shaft.

6 is a view showing another permanent magnet of the rotation angle sensor of the present invention.

7 is a view illustrating a state in which the permanent magnet of FIG. 6 is coupled to a rotating shaft.

8 is a flowchart showing the steps of forming a coating part on the permanent magnet and the rotating shaft of the present invention in order.

<Explanation of symbols for the main parts of the drawings>

2: rotating body 4: rotating shaft

6: permanent magnet 7: printed circuit board

8: Hall element 10: housing

12: main body 13: rotating part

14: receiver 15: divider

17: connector 18: border

20: upper cover 30: lower cover

32: border 33: guide groove

40: sealing member 50: coating part

Claims (5)

delete A printed circuit board having a rotating body connected to a rotating object, a rotating shaft connected to one side of the rotating body, a permanent magnet rotated together with the rotating shaft, and a sensing unit for detecting a change in the magnetic field direction of the rotating permanent magnet. In the rotation angle sensor comprising: The permanent magnet is magnetized before being coupled to the rotating shaft, The magnetized permanent magnet is coupled to the rotating shaft, Rotation angle sensor, characterized in that further comprising a coating formed in the state in which the permanent magnet is coupled to the rotation shaft. The method of claim 2, The coating part is formed by injection molding in a state in which the permanent magnet is coupled to the rotating shaft, Rotation angle sensor, characterized in that the part or all of the peripheral portion where the permanent magnet is located among the injection mold for forming the coating portion using a mold formed of a non-magnetic material. The method of claim 2, Rotation angle sensor, characterized in that the permanent magnet is ring-shaped. The method of claim 2, The permanent magnet is a rotation angle sensor, characterized in that the disk-shaped or cylindrical or cylindrical.

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