KR100331654B1 - Method of manufacturing actuator of anti-lock brake system - Google Patents

Abstract

PURPOSE: A method of manufacturing an actuator of an anti-lock brake system is provided to reduce the weight of an anti-lock brake system and improve the manufacturing process and processing time by making the anti-lock brake system from plastic material. CONSTITUTION: A method of manufacturing an actuator of an anti-lock brake system comprises steps of injecting an oil passage through an oil passage mold to inject the oil passage with plastic(S1); cutting a high-pressure accumulator and a low-pressure accumulator of the oil injected passage and cutting a pump bore and a valve bore(S2); applying adhesive on the surface of the cut oil passage and keeping a contact state of an actuator block and the oil passage(S3); and installing the applied oil passage at a metal mold for injection of the actuator block and performing injection molding of the actuator block with plastic(S4). The actuator is made from plastic and therefore, the weight of the anti-lock brake system is reduced and the manufacturing is improved.

Description

Actuator manufacturing method of anti-lock brake system

The present invention relates to an actuator manufacturing method of an anti-lock brake system, and more particularly, to an actuator manufacturing method of an anti-lock brake system in which an actuator block formed inside the actuator and an actuator block formed outside the passage are formed of a plastic injection molded product. It is about.

In general, the antilock brake system is a device to secure the direction stability and driving force of the vehicle by suppressing excessive slip of the driving wheel of the vehicle. The pressure is controlled by maintaining or increasing pressure, so that the proper cornering force is secured to maintain steering and at the same time control the slip rate to obtain the largest value of the friction coefficient so that the braking stop distance is the shortest.

The anti-lock brake system is composed of a device such as a wheel speed sensor, an actuator, a control unit, and the actuator controls the braking force by depressurizing, maintaining or increasing the hydraulic pressure with each brake wheel cylinder.

The actuator is provided with a hydraulic valve for controlling the supply of oil. This hydraulic valve is provided with a normal open valve and a normal close valve. And the flow path for the outflow and outflow of oil to each hydraulic valve is comprised inside.

Actuators in such anti-lock brake systems are generally made of aluminum, which is then fabricated to form spaces and flow paths for mounting the necessary parts of the system inside the initial head-shaped square aluminum.

In addition, a specific flow path is prevented by using a ball or an expander to complete the flow path as shown in FIG. 2.

However, such an aluminum actuator of the prior art requires a large amount of cycle time and investment cost due to the processing of aluminum one by one to create a component mounting space, and a lot of additional processes are followed.

In addition, since aluminum is a metal having a lower weight than other metals, when the actuator is manufactured from metal, it is difficult to reduce the weight of the actuator any more.

The present invention is to solve the above problems, an object of the present invention to reduce the overall weight of the anti-lock brake system by improving the manufacturing process and time by the plastic material of the actuator of the anti-lock brake system, To provide a method of manufacturing a plastic actuator.

1 is a view showing a hydraulic circuit diagram of a general anti-lock brake system.

Figure 2 is a perspective view of a block of the antilock brake system according to the present invention.

Figure 3 is a perspective view showing a flow path installed inside the actuator block according to the present invention.

Figure 4 is a block diagram showing a manufacturing step of the actuator according to the present invention.

* Description of the symbols for the main parts of the drawings *

50 ... pedal 51 ... master cylinder

53 Low pressure accumulator 54 High pressure accumulator

55 ... wheel speed sensor 56 ... control part

57 ... pump 58 ... normally open valve

59 ... normally closed valve 60 ... actuator block

In order to achieve the above object, the actuator manufacturing method of the anti-lock brake system of the present invention includes a hydraulic valve for controlling oil supplied to a brake device installed on a wheel of a vehicle and a low pressure accumulator for storing oil passing through the hydraulic valve. And an oil passage formed therein such that a pump for pumping oil from the low pressure accumulator and a high pressure accumulator for storing the high pressure oil pumped by the pump are provided therein. A flow path injection step of injection molding the flow path through a flow path injection mold, and cutting the high pressure accumulator and the low pressure accumulator of the injection molded flow path through the flow path injection step to inject the plastic into the plastic; The cutting step of cutting the bore, the cutting step Glue application step to maintain the contact state of the block and the flow path by applying an adhesive on the surface of the flow path, the flow path through the adhesive application step is installed in a mold for injection of the actuator block to inject the actuator block with plastic It characterized in that it has an actuator block injection step of molding.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the drawings.

1 is a view showing a hydraulic circuit diagram of a general anti-lock brake system, Figure 2 is a perspective view showing a block of the anti-lock brake system according to the present invention. 3 is a perspective view showing a flow path installed inside the actuator block according to the present invention, and FIG. 4 is a block diagram showing a manufacturing step of the actuator according to the present invention.

As shown in FIG. 1, the antilock brake system includes a master cylinder 51 for supplying oil to a brake device by the operation of the brake pedal 50 and the brake pedal 50. Hydraulic valves 58 and 59 for controlling the oil supplied to the wheel cylinder of the brake device provided in the 52 are provided.

The hydraulic valves 58 and 59 are provided with a normal open valve 58, which is a valve that is always open before operation, and a normal close valve 59, which is a valve which is always closed before operation. do.

The low pressure accumulator 53 storing the low pressure oil and the pump 57 pumping the oil of the low pressure accumulator 53 and the high pressure fish storing the high pressure oil pumped by the pump 57 are stored. The cumulator 54 is provided, respectively.

In addition, the wheel 52 is provided with a wheel speed sensor 55 for detecting an operation state of the wheel 52, the control unit 56 (Electronic Control Unit: ECU) for controlling the operation of these components is provided. .

The low pressure accumulator 53, the high pressure accumulator 54, and the pump 57 and the hydraulic valves 58 and 59 are installed in the actuator 60 as shown in FIG. The actuator 60 is provided with a block formed of a square plastic material and a flow path 61 formed inside the block as shown in FIG. 3.

The reason why the actuator 60 and the flow path 61 are made of plastic is that the weight of the actuator can be significantly reduced compared to the conventional aluminum, whereas the conventional aluminum is about 2,7 of the specific gravity. Since the specific gravity can be reduced to about 1.6 to 2.1, the weight can be reduced by about 25% compared to aluminum, and the manufacturing time and cost can also be reduced compared to the prior art.

In the present invention, the actuator 60 block and the flow path 61 may be provided by thermosetting or thermoplastic resin, respectively, and in some cases, may be made of the same material. Generally, the thermoplastic resin is chemically structurally linear. ), Polystyrene, polyethylene, polyamide and the like. And it is processed efficiently by extrusion molding and injection molding.

In addition, thermosetting resin refers to a synthetic resin that has a thermosetting property and finally hardens to an insoluble state in a thermoplastic state when the reaction proceeds. In the curing step, the resin has a network structure. In general, moldings having good heat resistance solvent resistance and filling with filler can be obtained.

Hereinafter, the manufacturing process of the plastic actuator of the present invention will be described with reference to FIG.

As described above, the actuator 60 may be provided including the flow path 61 therein, and for this purpose, a separate mold for injection molding of the flow path 61 and the actuator 60 is required.

When the two molds are prepared, first, the flow path injection step S1 of injection molding the flow path 61 through a flow path injection mold is performed to inject the flow path 61 into plastic. In this flow path injection step (S1), a liquid thermosetting resin or a thermoplastic resin is poured into a mold and solidified. The flow path 61 is not completely molded, and the overall frame of the exterior is completed as shown in FIG. 3.

Next, the high pressure accumulator 54 and the low pressure accumulator 53 are cut into the flow path 61 injection-molded through the flow path injection step S1, and the pump 57 and the valve 58 ( The pump bore 64 and the valve bore 62 for the installation of the 59 are subjected to the cutting step (S2) of the cutting process.

At this time, it is preferable to cut only the accumulators 53 and 54, the pump bore 64 and the valve bore 62, and to cut the other small flow paths after injecting the actuator 60 block. .

And the adhesive is applied to the surface of the flow path through the cutting step (S2) is subjected to the adhesive coating step (S3) to maintain the contact state of the actuator 60 block and the flow path (61). In this adhesive coating step (S3) it may be applied a heat-resistant agent for the frame protection.

Next, the actuator block injection step (S4) is installed in the mold for injection of the actuator (60) block through the adhesive coating step (S3) to pour the liquid plastic resin material and the injection molding of the actuator (60) block (S4). After passing through), the outer appearance of the plastic actuator 60 of the present invention is almost completed.

At this time, it is preferable that the injection molding actuator 60 includes a precision cutting step (S5) that the actuator 60 finally completes by precision cutting the remaining flow path.

This precision cutting step (S5) is for cutting all the flow paths 61 in the above-mentioned cutting step (S2), but for precise cutting after complete injection molding to ensure higher precision.

Hereinafter, the operation of the anti-lock brake system provided with the plastic actuator 60 of the present invention will be described. The operation of the system is to perform the braking function through the steps of increasing, maintaining and depressurizing the vehicle while driving.

First, in the boost mode, the oil of the master cylinder 51 is transmitted to the wheel cylinder through the normal open valve 58 by the driver pressing the brake pedal 50. As a result, the brake pressure is increased, and the wheels 52 of the vehicle are braked as the cylinder piston of the brake device is pushed, thereby reducing the speed of each wheel.

When the difference between the speed of the wheel 52 received from the wheel speed sensor 55 and the speed of the car, that is, the slip ratio exceeds a predetermined range, the control unit 56 controls the normal open valve to reduce the pressure of the wheel 52. 58 to close the flow path between the wheel 52 and the master cylinder 51.

As a result, the oil pressure is no longer transmitted to the wheel 52, and at the same time, the normal close valve 59 is operated to receive the hydraulic pressure in the wheel 52 in the low pressure accumulator 53. At the same time, the pump 57 pumps the oil to store the oil in the high pressure accumulator 54. This state is called a decompression mode.

On the other hand, the speed of the wheel 52 is increased again due to the decompression mode. At this time, the controller 56 watches the state of the wheel 52 over time, which is called a maintenance mode. In this holding mode, the normally open valve 58 is closed and the normal closed valve 59 is closed so that oil delivered from the master cylinder 51 to the wheel cylinder cannot enter or exit through the normal closed valve 59. do.

And if the speed of the wheel 52 is revived again, the speed of the wheel 52 is reduced again. To this end, the current is cut off so that pressure is transmitted to the wheel cylinder so that the normal close valve 59 is blocked, and thus, the pressure of the wheel 52 does not fall into the low pressure accumulator 53 so that the restart is performed again. .

The thermoplastic resin or the thermosetting resin actuator manufactured according to the plastic actuator manufacturing method of the anti-lock brake system of the present invention as described above can significantly reduce the weight compared to the case of manufacturing the actuator with aluminum, and also the material cost aspect Can save roughly 35% of the cost. Compared to machining, injection is cheaper for various reasons, so the overall product price can be reduced, and the number of parts is considerably reduced since balls or expanders are not needed to block the flow path generated when machining the existing aluminum block. In addition, there is an effect that can freely design the block smaller.

Claims (6)

A hydraulic valve for controlling oil supplied to a brake device installed in a wheel of a vehicle, a low pressure accumulator for storing oil passing through the hydraulic valve, a pump for pumping oil from the low pressure accumulator, and a high pressure pumped by the pump In the actuator manufacturing method of the anti-lock brake system in which the flow path is formed so that the high-pressure accumulator is stored therein, A flow path injection step of injection molding the flow path through a flow path injection mold to inject the flow path into the plastic; A cutting step of cutting the high pressure accumulator and the low pressure accumulator of the injection molded flow path through the flow path injection step, and cutting the pump bore and the valve bore; Adhesive coating step to maintain the contact state of the actuator block and the flow path by applying the adhesive on the surface of the flow path after the cutting step, The actuator manufacturing method of the anti-lock brake system, characterized in that it comprises an actuator block injection step of injection molding the actuator block with a plastic by installing the flow path through the adhesive applying step in the mold for injection of the actuator block. The method of claim 1, wherein the high precision accumulator, the low pressure accumulator, the pump bore, and the valve bore, which are cut at the cutting step of the actuator flow path through the actuator block injection step, are precisely cut. Actuator manufacturing method of the anti-lock brake system, characterized in that further comprising a cutting step. The method of manufacturing an actuator of an anti-lock brake system according to claim 1 or 2, wherein the flow path is injection molded with a thermosetting resin. The method of manufacturing an actuator of an anti-lock brake system according to claim 1 or 2, wherein the flow path is injection molded from a thermoplastic resin. The method according to claim 1 or 2, wherein the actuator block is injection molded into a thermosetting resin. 3. An actuator manufacturing method according to claim 1 or 2, wherein the actuator block is injection molded from thermoplastic resin.