KR100550952B1 - Device for non-contact brake consisting of an electromagnet and a permanent magnet - Google Patents

Abstract

The present invention relates to a non-contact brake device using an electromagnet, wherein an iron core is formed on a permanent magnet formed in contact with a circumferential direction on an inner circumference of a yoke rotating together with a driving wheel of an automobile and a disk plate disposed around the yoke. It provides semi-permanent and stable braking force by installing the electromagnet which is formed when the coil is wound around the iron core and applying a constant current to the coil, and switching from the conventional contact brake method to the non-contact brake method through the interaction between the permanent magnet and the electromagnet. It relates to a non-contact brake device using an electromagnet.

Brake, electromagnet, current

Description

Device for non-contact brake consisting of an electromagnet and a permanent magnet             

1 is a perspective view schematically showing a conventional disk brake for a vehicle,

2 is a block circuit diagram schematically showing a non-contact brake device using an electromagnet according to an embodiment of the present invention;

3 is a rear view of the non-contact brake device using an electromagnet according to an embodiment of the present invention;

4A is a graph showing each vehicle driving condition;

4B is a graph illustrating current control of the electronic control unit according to each vehicle driving condition.

Description of the main parts of the drawing

10: drive shaft, 15: connecting member,

18: steering knuckles, 20: yoke,

25: permanent magnet, 30: coil,

40: disc plate, 42: iron core,

45: Hall sensor, 50: electronic control unit,

60: brake closing, 65: operation sensor,

70: vehicle speed sensor, 80: wheel speed sensor,

90: power supply.

The present invention relates to a non-contact brake device using an electromagnet, and more particularly, an iron core in a permanent magnet formed in contact with a circumferential direction on the inner circumference of a yoke rotating together with a driving wheel of an automobile and a disc plate positioned around the yoke. It is semi-permanent by forming an electromagnet which is formed when the coil is wound around the iron core and a constant current is flowed through the iron core, and then switches from the conventional contact brake method to the non-contact brake method through the interaction between the permanent magnet and the electromagnet. It relates to a non-contact brake device using an electromagnet that provides a stable braking force.

In general, a brake device is divided into a main brake (also called a foot brake) used while driving a car and a parking brake (also called a hand brake) used for parking a car. The operating mechanism of the brake device includes a mechanical brake using a wire, a hydraulic brake using a hydraulic pressure, a pneumatic brake using compressed air, and the like. The brake device currently used mainly is a hydraulic brake device that presses a friction pad to a brake drum or a disc using hydraulic pressure.

In general, the disc brake is equipped with a disc of a steel cast iron disk that rotates with the wheel, and pushes the brake pad acting as a hydraulic piston to the outer side of both sides of the disc brake to brake by the friction force of the brake pad. Brake system (Brake System) is an important device used to keep the vehicle parked while at the same time slowing or stopping the vehicle driving. In general, the brake device uses a friction type brake that converts the kinetic energy of the vehicle into thermal energy and releases heat into the atmosphere by using frictional force.

A conventional disc brake will be described with reference to FIG. 1 is the contents disclosed in the Republic of Korea Utility Model Publication (Publication No. 1998-030481).

As shown in FIG. 1, when the hydraulic pressure flows into or out of the cylinder 5, the cylinder 5 is movable left and right by guide pins 9 formed at both ends of the cylinder 5. One side of the cylinder 5 is provided with a hydraulic pipe (not shown) is connected.

A piston 1 is provided inside the cylinder 5 so that when the hydraulic pressure flows into the cylinder 5, the hydraulic pressure pushes the piston 1 and the cylinder 5 to both sides, so that both sides of the disk 3 are provided. The friction pad 7 provided compresses the disk 3 in both directions, thereby preventing rotation of the disk 3 by the friction force.

However, in the conventional brake device, the vehicle brakes by using the friction force between the brake pad and the disk, thereby causing a slip phenomenon, that is, the vehicle may slip during braking. In addition, due to the wear of the brake pads, the brake pads must be constantly checked / replaced, which makes the management of the brake device cumbersome. The brake pads may be subjected to abnormal vibrations during sudden braking due to uneven wear of the brake pads, resulting in an accident.

The present invention has been proposed to solve the above problems, and forms an iron core in the permanent magnet and the disk plate located around the yoke in contact with the circumferential direction formed on the inner circumference of the yoke that rotates together with the driving wheel of the vehicle and It provides semi-permanent and stable braking force by installing the electromagnet which is formed when the coil is wound around the core and flowing a constant current to the coil, and switching from the conventional contact brake method to the non-contact brake method through the interaction between the permanent magnet and the electromagnet. The purpose is to provide a non-contact brake device using an electromagnet.

The apparatus of the present invention for achieving the above object, the yoke is fixed to the wheel drive shaft and rotates with the drive shaft; A permanent magnet fixed to the yoke so that a plurality of N poles and S poles are circumferentially alternating; A disk plate fixed to the steering knuckle so as to face the yoke and having a plurality of winding coils formed to face the permanent magnet, the disk plate being formed to correspond to the N pole and the S pole of the permanent magnet, respectively; An operation detecting sensor for detecting and outputting a play of the brake pedal; A vehicle speed sensor for outputting a vehicle speed; And a non-contact brake using an electromagnet composed of an electronic control unit configured to receive a signal output from the operation sensor and the vehicle speed sensor, determine a current strength to be applied to the winding coil, and control the application of the determined current to the winding coil. Device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In contrast to permanent magnets that always have the power of the magnet, there are electromagnets that have the power of the magnet only when current flows. When a current flows through the coil, a magnetic field is generated around it. By using this, coils are wound around the iron core and a current is flowed to form a magnetic field. The iron core has the properties of a magnet. The strength of the magnet in the electromagnet is proportional to the strength of the current flowing through it. The greater the current, the greater the strength of the magnet. Also, the direction of the N pole in the electromagnet is related to the direction of the current. For example, when the direction of the current is changed, the direction of the N pole is also changed.

Magnets have an N pole and an S pole. When two magnets are close to each other, the same poles push each other, and the other poles tend to pull each other. When the electromagnet and the permanent magnet coincide with the same pole (S pole and S pole or N pole and N pole), the property of the magnet is pushed to each other, and the pole of the electromagnet and the permanent magnet is different from each other (S pole). And N pole or N pole and S pole), the property to stick to each other will act.

FIG. 2 is a block circuit diagram schematically illustrating a non-contact brake device using an electromagnet according to an embodiment of the present invention, and FIG. 3 is a state view of a disc plate viewed from the back of the non-contact brake device using an electromagnet according to an embodiment of the present invention. .

The drive shaft 10 is rotated as a power source of the vehicle. The drive shaft 10 is connected to a drive wheel (not shown) to rotate the drive wheel.

The steering knuckle 18 is connected to a knukle arm (not shown) and allows the tire (not shown) to move left and right. Looking at this operation process in detail, the rotational motion generated by the driver operating the steering wheel is transmitted to the gearbox (not shown), and the rotational motion is changed from the rotational motion to the power of the left and right motion by the action of the rack and pinion. Power is transmitted to the end of the tie rod via a tie rod (not shown). Thus, the tie rod end and the knuckle arm are connected, the power transmitted to the end of the tie rod is transmitted to the knuckle arm and to the steering knuckle 18 connected to the knuckle arm to move the tire left and right.

The yoke 20 has a hole formed in the center thereof and is inserted into the drive shaft 10 through the hole. In the central portion of the yoke 20 is connected to the drive shaft 10 is to be rotated by the operation of the drive shaft (10). One side of the yoke 20 facing outward is connected to the tire (not shown) by the connecting member 15. As the tire rotates as the yoke 20 is rotated as described above, the yoke 20 serves as a rotor.

The permanent magnet 25 is formed in contact in the circumferential direction on the inner circumference of the yoke 20, such a permanent magnet 25 is sequentially placed in the order of N pole-S pole-N pole-S pole while keeping a certain distance Formed.

The disk plate 40 is connected to the steering knuckle 18 and serves as a fixed stator. In the non-contact brake device using an electromagnet, the disk plate 40 is formed of a nonmagnetic material to prevent foreign matter from tangling to the disk plate 40 when the brake is operated. In addition, to prevent the other components of the vehicle from being affected by the magnetic material by the disk plate 40.

Iron cores 42 are formed on the surface of the disk plate 40 in a plurality of protrusions in a constant circumferential direction. The iron core 42 is formed at a certain distance, the position of the iron core 42 may be formed in the same position as the permanent magnet 25 formed on the yoke 20. In addition, the position of the iron core 42 may be formed differently from the position of the permanent magnet (25).

Hall sensor 45 is formed on the surface of the disk plate 40 located inside each of which is surrounded by the iron core 42, the number of revolutions of the rotating permanent magnet 25 and the current Hall sensor 45 It serves to know the pole type (N pole or S pole) of the permanent magnet 25 located in close proximity to. The hall sensor 45 is connected to the electronic control unit 50 and electronically controls the pole type detection signal of the permanent magnet 25 located in close proximity to the detection signal for the rotational speed of the rotating permanent magnet 25. Output to the unit 50.

In addition, by counting the permanent magnet 25, the type of the pole changes as it rotates through the Hall sensor 45 can also measure the speed of the current drive wheel.

The coil 30 is formed by winding several times around the iron core 42 and is electrically connected to the electronic control unit 50 through an electric wire. In this way, the iron core 42 serves to change the electromagnet corresponding to the amount of current applied from the electronic control unit 50 which is electrically connected.

The electronic control unit (ECU) 50 controls various types of operating conditions based on vehicle information received from various sensors and controls the overall control of the vehicle, in particular, the braking system of the vehicle in relation to the present invention. It plays a role.

The brake pedal 60 may be pressed less or deeper depending on the clearance distance of the brake pedal 60 when the driver performs the braking operation of the vehicle.

The operation detection sensor 65 is connected to the brake pedal 60, and the electronic control unit detects a voltage change signal that appears by determining a clearance distance of the brake pedal 60 connected in this way and measuring a voltage change thereto. 50).

The vehicle speed sensor 70 is a sensor for detecting a driving speed when the vehicle is driven and is installed in a speed meter driven gear (not shown) of a type installed in a speed meter (not shown) in the form of a reed switch and a transaxle (not shown). There is.

The wheel speed sensor 80 installs a sensor for each wheel of the vehicle and sends a wheel speed signal to the electronic control unit 50 for each wheel. Furthermore, as an embodiment of the present invention, the speed of each wheel may be measured through the hall sensor 45.

The power supply unit 90 is provided inside the vehicle to operate electric / electronic components of the vehicle. The power supply unit is in charge of the generator while the vehicle is running, that is, while the engine is rotating, and the battery is a generator. This is used to store the remaining electricity and to rotate the starting motor when starting the engine.

However, the power supply unit 90 is not limited thereto, and may use a power source of a battery provided separately.

The operation and effects of the non-contact brake device using the electromagnet of the present invention configured as described above will be described in detail.

When the driver generates a braking condition while driving the vehicle to brighten the brake pedal 60, the operation detection sensor 65 connected to the brake pedal 60 detects this. The brake pedal operation detection signal detected as described above is input to the electronic control unit 50.

In addition, the hall sensor 45 is installed inside the iron core 42 protruding from the disk plate 40 of the vehicle, and the hall sensor 45 is fixed to the disk plate 40 and is rotated in the permanent magnet 25. The type of pole (ie, whether the permanent magnet located around the hall sensor is the N pole or the S pole) is determined. As such, the position information signal of the permanent magnet determined by the hall sensor 45 is sent to the electronic control unit 50 in real time.

In addition, the vehicle speed information from the vehicle speed sensor 70 and the wheel speed information of the vehicle output from the wheel speed sensor 80 are sent to the electronic control unit 50 in real time.

As such, the electronic control unit 50 receiving the vehicle state information compares / analyzes the vehicle state information and supplies the direction of the current and the strength of the current corresponding to the braking condition of the vehicle to the coil 30.

When the electronic control unit 50 supplies the strength of a constant current to the coil 30, the iron core 42 wrapped by the coil 30 is converted into an electromagnet.

The direction of the magnet appearing in the electromagnet changes according to the direction of the flowing current. By using the same principle, the electronic control unit 50 can control the braking of the vehicle by controlling the direction of the current according to the braking condition of the vehicle. The electronic control unit 50 detects the pole types of the permanent magnets 25 input through the hall sensor 45 and makes the poles of the permanent magnets 25 and the electromagnets adjacent to each other different from each other. It can give braking power. Here, to make the poles of the electromagnet different may be made by changing the direction of the current flowing through the coil 30.

The iron core 42 converted to the electromagnet forms a magnetic field around it, and applies braking to the yoke 20 which is rotating through interaction with the permanent magnet 25.

4A is a graph showing each vehicle driving condition, and FIG. 4B is a graph showing current control of the electronic control unit according to each vehicle driving condition.

In FIG. 4A, the horizontal axis represents the load of the vehicle, and the vertical axis represents the driving speed of the vehicle. Vehicle driving condition A is traveling at high speed and shows a high load. Vehicle driving condition B is traveling at a low speed and exhibits a high load. The vehicle driving condition C is traveling at a high speed and shows a deterioration. The vehicle driving condition D is traveling at a low speed and shows a deterioration.

4B is a graph illustrating current control of the electronic control unit according to each vehicle driving condition. In FIG. 4B, the horizontal axis represents the brake operation time, and the vertical axis represents the strength of the current supplied to the coil by the electronic control unit.

In general, F (force) = M (mass) * V (speed) ^ 2. Therefore, the force is proportional to the mass and proportional to the square of the velocity. In order to brake the vehicle, a braking force corresponding to such a force must be provided. The electronic control unit must supply a current proportional to the force to the coil.

 The strength of the magnet appearing in the electromagnet is proportional to the strength of the flowing current, that is, the greater the magnitude of the current, the greater the strength of the magnet. By using the same principle, the electronic control unit 50 controls the amount of current according to the braking condition of the vehicle.

Therefore, in FIG. 4B, the vehicle driving condition in which the electronic control unit 50 supplies the most current to the coil 30 is A, and the vehicle driving condition in which the least current is supplied to the coil 30 is D. In addition, in the vehicle driving conditions B and C, the influence of the speed has a large influence on the speed, and thus the vehicle driving condition C needs to supply more current.

The current control of the electronic control unit 50 according to each vehicle driving condition is shown. At this time, the strength of the current supplied to the coil 30 increases in a straight line and then remains constant for a certain time and then decreases. do. As such, the electronic control unit 50 controls the intensity of the current, which is determined based on the vehicle information input through the vehicle speed sensor 70, the wheel speed sensor 80, the hall sensor 45, and the like. Done.

In an embodiment of the present invention, the permanent magnet is attached to the yoke to act as a rotor, and when a current flows, the coil having an electromagnet serves as a stator.

 However, in another embodiment, by forming an iron core in the yoke and winding the coil, the electromagnet acts as a rotor when the current flows, and the permanent magnet acts as a stator. In this case, the coil acts as a rotor, and thus, a brush or the like should be further configured so as not to mess with each other during the rotation of the yoke.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

The non-contact brake device using the electromagnet of the present invention as described above has the following effects.

First, by generating the braking force of the brake by using the force of the electromagnet without using hydraulic pressure or pneumatic, the configuration of the brake device can be simplified and a semi-permanent brake system with the endurance life of the vehicle can be constructed.

Second, the brake pad is a component installed for braking of the disc brake, and the wear condition must be regularly checked to replace it when the amount of wear is severe. In the non-contact brake device using an electromagnet as in the present invention, the brake pad is repaired due to wear of the brake pad. And replacement work can be eliminated.

Third, the brake pad is changed in material due to frictional heat caused by excessively pressing the brake pedal, and it is possible to eliminate a braking force loss phenomenon such as a fade phenomenon in which the brake is hard to hear.

Fourth, it is possible to control the attitude of the vehicle during braking by interlocking with the electronic control unit. Excellent braking force, no wear and noise of brake pads, and the optimum braking torque can be transmitted non-contacting to minimize braking distance.

Claims (3)

delete delete A yoke fixed to the wheel drive shaft and rotating together with the drive shaft; Permanent magnets fixed to the yoke so that a plurality of N poles and S poles are alternating with each other;  A disk plate made of a nonmagnetic material and fixed to the steering knuckle so as to face the yoke, and having a plurality of winding coils formed to face the permanent magnet, the disk plate being formed to correspond to the N pole and the S pole of the permanent magnet, respectively; An operation detecting sensor for detecting and outputting a play of the brake pedal; A vehicle speed sensor for outputting a vehicle speed; Hall sensors formed on the surface of the disk plate to detect the pole of the permanent magnet and Receiving a signal output from the operation detection sensor, the vehicle speed sensor and the Hall sensor to apply a current to the plurality of winding coils so that the N pole and the S pole are formed alternately to the winding coil, the current of the applied current Non-contact brake system using an electromagnet composed of an electronic control unit that determines the strength in a pattern of increase, maintenance and decrease in the order of passage of time.

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