KR20020044468A - Anti-lock brake system of vehicle - Google Patents

Abstract

PURPOSE: An ABS(Anti-lock Brake System) of a vehicle is provided to reduce the percent defective in the interference-fit of a mobile magnet ring by interferingly fitting the mobile magnet ring to the outer face of a hub bearing assembly and installing a fixed magnet in a speed sensor, to prevent an accident by making an ABS operated smoothly, and to semi-permanently use the mobile magnet ring and the fixed magnet. CONSTITUTION: A mobile magnet ring(31) is installed on the outer face of a hub bearing assembly(10). A speed sensor(22) is installed in a fixed bracket(18). A fixed magnet(32) consisting of a singular polarity is installed in the speed sensor near the mobile magnet ring. If the polarity of the mobile magnet ring is the same as that of the fixed magnet, the speed sensor senses an induced current and transmits an electrical signal to an ECU(Electronic Control Unit). The ECU controls an ABS by controlling the brake pressure.

Description

Anti-lock brake system of car {ANTI-LOCK BRAKE SYSTEM OF VEHICLE}

The present invention relates to an anti-lock brake device for an automobile, and in particular, a component of an anti-lock brake system using magnet properties is installed in a hub bearing assembly of a non-driving wheel so that the manufacturing cost can be reduced and used semi-permanently. It relates to a brake device.

Generally, the anti-lock brake system (hereinafter referred to as ABS) means that when the vehicle is braked, the center of the vehicle moves forward according to the deceleration speed, so that the load on the front wheel increases and the load on the rear wheel decreases. When the wheel stops and causes skids, the frictional force with the road surface decreases and the braking performance decreases and causes instability. Therefore, it refers to a device for maintaining the front and rear, right and left braking force uniformly.

The ABS device is classified into mechanical ABS and electronically controlled ABS. The electronically controlled ABS includes a tone wheel which is largely installed on the outer diameter of the hub bearing, a speed sensor that detects the rotational state of the wheel using the rotation of the tone wheel, and an ABS device. ECU (electronic control unit) for controlling the control unit, and a modulator for controlling the hydraulic pressure applied to the wheel cylinder by the signal from the ECU.

Meanwhile, FIGS. 1 and 2 illustrate a state in which a tone wheel and a speed sensor constituting a conventional ABS are installed in a hub bearing assembly constituting a non-drive wheel axle.

That is, as shown in FIGS. 1 and 2, the hub bearing assembly 10 includes a pair of bearings 12 and 13 facing each other on the outer circumferential surface of the spindle 11, and the bearing 12. Axle hub 14 is coupled to the outer circumferential surface of 13, and the hub nut 16 is coupled to the end of the spindle 11 via a hub washer 15, so that the spindle 11 and the axle hub 14 are connected to each other. ) Are coupled to each other, and one side of the axle hub 14 has a structure in which a hub cap 17 is formed to surround the hub nut 16 and protect the inside of the axle hub 14. have.

Here, the outer wheel of the axle hub 14, as shown in Figures 3 and 4 is coupled to the tone wheel 21 (gear wheel) formed with gear teeth 21a along the outer peripheral surface of one surface, the steering does not rotate when driving The knuckle fixing bracket 18 is provided with a speed sensor 22 such that the pole piece 22a is positioned at a portion proximate to the gear teeth 21a of the tone wheel 21.

On the other hand, the tone wheel 21 and the speed sensor 22 are components of the ABS.

Accordingly, when the vehicle is driven, the tone wheel 21 rotates together with the hub bearing assembly 10. The gear teeth 21a of the tone wheel 21 coincide with the pole pieces 22a of the speed sensor 22. When the magnetic field is not changed, the magnet becomes the strongest, and the voltage signal between the coil of the speed sensor and the ECU becomes zero.

When the pole piece 22a of the speed sensor 22 is separated from the gear teeth 21a of the tone wheel 21, the generation of the magnetic force line is weakened and the induced electromotive force is generated in the coil of the speed sensor 22 to generate the ECU. The ECU compares the AC signal transmitted from the speed sensor 22 with the signal transmitted from the brake switch, detects the braking state of each wheel, and sends a signal to the modulator to adjust the appropriate brake pressure. Will be activated.

However, in order to use the tone wheel 21 as a component of ABS, the tone wheel 21 needs to be press-installed on the outer circumferential surface of the hub bearing assembly 10. In this case, the pole piece 22a of the speed sensor 22 does not properly detect the gear teeth 21a of the tone wheel 21, and thus ABS is not activated in an emergency situation in which an ABS should be activated. There was a problem that caused an accident.

In addition, since the tone wheel 21 is made of a special material requiring heat resistance and abrasion resistance, there is a problem in that the manufacturing cost is greatly increased.

Accordingly, the present invention has been made to solve all the above problems, by installing the movable magnet ring and the fixed magnet to operate the ABS device using the induced current of the magnetic field in the hub bearing assembly and the speed sensor, respectively, The purpose of the present invention is to provide an anti-lock brake device for automobiles that can be used semi-permanently while reducing manufacturing costs by reducing the occurrence of safety accidents by reducing the indentation defect rate of ABS.

The present invention for achieving the above object, the outer circumferential surface of the hub bearing assembly is provided with a movable magnet ring provided with the N pole and the S pole alternately across the front surface, the fixing bracket of the steering knuckle that does not rotate during driving The speed sensor is installed, and the speed sensor is located in close proximity to the movable magnet ring, characterized in that a fixed magnet consisting of one pole is connected to be spaced apart from the speed sensor at a predetermined interval.

1 and 2 are a schematic perspective view and a longitudinal cross-sectional view for explaining a state in which the tone wheel and the speed sensor constituting the conventional ABS installed on the non-drive wheel axle,

3 and 4 are perspective views for explaining a tone wheel and a speed sensor constituting a conventional ABS,

Figure 5 is a schematic longitudinal cross-sectional view for explaining a state in which the movable magnet ring and the stationary magnet and the speed sensor constituting the ABS in accordance with the present invention installed on the non-drive wheel axle,

6 is a perspective view for explaining the movable magnetic ring according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10-Hub Bearing Assembly 11-Spindle

12,13-Bearing 14-axle hub

15-Herb Washers 16-Herb Nuts

17-Hub Cap 18-Mounting Bracket

22-Speed sensor 31-Moving magnet ring

32-stator magnet

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

5 is a schematic longitudinal cross-sectional view for explaining a state in which the movable magnet ring and the stationary magnet and the speed sensor installed in the non-drive wheel axle constituting the ABS according to the present invention, the movable magnet ring constituting the ABS device according to the present invention ( 31) is installed in the hub bearing assembly 10, the speed sensor 22 is installed on the fixing bracket 18 of the steering knuckle, and the fixed magnet 32 is connected to the speed sensor 22 to be spaced at a predetermined interval. .

That is, as shown in FIG. 5, the hub bearing assembly 10 includes a pair of bearings 12 and 13 facing each other on the outer circumferential surface of the spindle 11, and the bearings 12 and 13. Axle hub 14 is coupled to the outer circumferential surface of the spindle 11, and a hub nut 16 is coupled to the end of the spindle 11 via a hub washer 15 to connect the spindle 11 and the axle hub 14 to each other. The one side of the axle hub 14 is configured to be coupled to the hub cap 17 to protect the inside of the axle hub 14 while surrounding the hub nut 16.

Here, as shown in FIGS. 5 and 6, the outer circumferential surface of the axle hub 14 has a movable magnet ring 31 formed in a circular shape and provided with N poles and S poles alternately provided over the entire length. .

The fixed bracket 18 of the steering knuckle (not shown) which is not rotated while driving is provided with a speed sensor 32 as shown in FIG. 5, and the speed sensor 32 is provided with only an N pole or an S pole. The fixed magnet 32 is formed so as to be spaced apart from the speed sensor 22 at a predetermined interval so as to be in close proximity to the movable magnet ring 31.

Accordingly, when the vehicle is driven, the movable magnet ring 31 is rotated together with the hub bearing assembly 10. At this time, an induction current by a magnetic field is generated between the movable magnet ring 31 and the stationary magnet ring 32. Will be generated.

That is, when the movable magnet ring 31 and the stationary magnet 32 coincide with the same pole (N pole and N pole or S pole and S pole), the property of sticking to each other by the property of the magnet acts. When the movable magnet ring 31 and the stationary magnet 32 coincide with different poles (N pole and S pole or S pole and N pole), a property of pushing the magnets by the nature of the magnet acts. When the magnet ring 31 is rotated together with the hub bearing assembly 10 at a high speed, the pushing and pulling force of the movable magnet ring 31 and the stationary magnet 32 is rapidly generated to generate an induced current by a magnetic field. .

At this time, the speed sensor 22 detects an induced current by a magnetic field and transmits an electric signal to an ECU (electronic control unit), and the ECU sends an AC signal transmitted from the speed sensor 22 and a brake switch. By comparing the signals, the brakes of each wheel are sensed and sent to the modulator to control the appropriate brake pressure to activate the ABS device.

Therefore, the fixed magnet made of only one pole to the speed sensor 22 while pressing and installing the movable magnet ring 31 provided with the N pole and the S pole to the outer circumferential surface of the hub bearing assembly 10 ( 32) is installed to operate the ABS device using the induced current of the magnetic field generated by the movable magnet ring 31 and the stationary magnet 32, as described above with reference to Figure 2 ABS Compared with the conventional structure in which the expensive tone wheel 21 is press-fitted to the outer circumferential surface of the hub bearing assembly 10 to operate the device, the inferiority rate of the operator is reduced, and the ABS device operates smoothly, thereby reducing the occurrence of safety accidents. In addition, as the manufacturing cost of the movable magnet ring 31 and the stationary magnet 32 is reduced than the conventional tone wheel 21, semi-permanent use is possible.

As described above, according to the present invention, while the magnetic magnet ring having the N pole and the S pole are provided in the press-fit direction on the outer circumferential surface of the hub bearing assembly, the speed sensor intersects the movable magnet ring to generate an induced current by a magnetic field. The fixed magnet is installed so that when the press-fit installation of the movable magnet ring is reduced indentation failure rate of the operator smoothly operating the ABS device to reduce the occurrence of safety accidents, as well as the movable magnet ring and the stationary magnet ABS device The manufacturing cost is reduced compared to the conventional tone wheel used to operate the semi-permanent effect can be used.

Claims (2)

The outer circumferential surface of the hub bearing assembly 10 is provided with a movable magnet ring 31 provided with alternating N and S poles over the entire length, and a speed sensor 22 in the fixed bracket 18 of the steering knuckle that is not rotated during driving. ) Is installed, the speed sensor 22 is located in close proximity to the movable magnet ring 31 is installed with a fixed magnet 32 consisting of one pole connected to be spaced apart from the speed sensor 22 at regular intervals. An anti-lock brake device for a vehicle. The method of claim 1, wherein the speed sensor 22 detects the induced current of the magnetic field generated when the movable magnet ring 31 and the stationary magnet 32 coincide with the same pole and with different poles. The anti-lock brake device of a vehicle, characterized in that for transmitting an electrical signal to the ECU to control the ABS device.