KR20110114901A - Electro wedge brake device for vehicle - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic wedge brake device for automobiles. The present invention relates to a mechanical wedge brake device that uses mechanical components that interlock with the operation of the motor 54 without using solenoids, which are electronic components. As a result, it is possible to ensure more stable performance and further reduce costs.
The electronic wedge brake device for automobiles of the present invention for achieving this is combined with the shaft 55 of the motor 54 which is driven by the control of the electronic control unit 53 so that the shaft (when the shaft 55 rotates). A linear movement block 56 moving along the lengthwise direction of 55; Coupled to the brake pad 52 for pressing the disk 51 to contact the brake pad 52 with the disk 51 or the disk 51 in accordance with the movement of the linear movement block 56. A wedge unit (60) contacting and shorting the brake pads (52); An adjust unit (70) installed to contact the wedge unit (60) to provide a force for pressing the wedge unit (60) toward the disk (51); One end is connected to the linear movement block 56 and the other end is installed to be selectively contacted with the adjust unit 70 to operate the adjust unit 70 according to the movement of the linear movement block 56. And an adjust control mechanism (80) for selectively restraining.

Description

Electronic wedge brake device for vehicle {Electro wedge brake device for vehicle}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic wedge brake device for an automobile, and more particularly, to a technique for an electronic wedge brake device for an automobile capable of reducing cost and increasing safety by reducing a failure rate.

In general, a brake device that generates a braking force using hydraulic pressure has a disadvantage in that the configuration is complicated by the use of various hydraulic mechanisms, as well as the deterioration in reliability and stability of the braking performance according to the hydraulic use.

This has led to the development of the Electro Wedge Brake (EWB), which brings the simplicity of the hydraulic brakes to a lesser extent, and enables the optimum implementation of the reliability and responsiveness of braking performance, and furthermore, integrated chassis control. The application is gradually increasing and trending.

Meanwhile, a configuration of a conventional electronic wedge brake device using a solenoid is briefly illustrated in FIG. 1, which has been described in detail through Patent Registration No. 10-0879890 to which the applicant has applied for a patent. .

As shown, a wedge unit 3 is coupled to a brake pad 2 that presses both sides of the disk 1 to generate a braking force by friction, and the wedge unit 3 is connected to the brake pad 2. Combination of the movable plate 4, the base plate 5 installed spaced apart from the movable plate 4, the wedge roller 6 interposed between the movable plate 4 and the base plate (5) In the configuration, the movable plate (4) and the base plate (5) is formed with a thread-shaped operating surface (4a, 5a), respectively, the wedge roller (6) is inserted into the operating surface (4a, 5a) It is a structure installed to enable cloud movement.

An adjust unit 7 is connected to the base plate 5, and the adjust unit 7 is screwed to the push rod 8 and the push rod 8 installed in close contact with the base plate 5. The support nut 9, the push rod 8 and the support nut 9 are installed so that both ends are supported to adjust the push rod 8 toward the base plate 5 toward the adjust spring 10. Consists of.

The push rod 8 consists of a head 8a and a screw shaft 8b, of which a latch 8c is integrally formed on the head 8a.

The screw shaft 8b is screwed so as to rotate freely with respect to the support nut 9, and the push rod 8 rotates by the force of the adjust spring 10 while the base plate ( 5) It is a structure that can be moved straight toward.

In order to restrain the free rotation of the push rod (8), the latch (8c) is coupled to the switch lever 11 in a detachable screwing manner, the switch lever 11 is operated by the solenoid 12 It becomes the structure that becomes.

That is, when the solenoid 12 is ON, the switch lever 11 is maintained in the engaged state with the latch 8c, and when the solenoid 12 is OFF, the switch lever 11 is in a state of being separated from the latch 8c.

The solenoid 12 is operated by the control of the electronic control unit 13 (hereinafter referred to as ECU).

In addition, the movable plate 4 is coupled to the linear movement block 16 through the connecting rod 14 and the interlocking rod 15, the linear movement block 16 is the shaft 18 of the motor 17 And screwed together, the motor 17 is driven to rotate the shaft 18, the linear movement block 16 along the longitudinal direction of the shaft 18 in accordance with the rotation direction of the shaft 18 It is a structure that moves linearly.

The motor 17 is operated by the control of the ECU 13.

Meanwhile, the support nut 9, the solenoid 12, and the motor 17 are installed in a fixed state in a housing (not shown), and the housing is coupled to and fixed to one side of a wedge caliper (not shown). Structure.

The conventional electronic wedge brake device configured as described above can implement a normal braking function and an automatic gap adjustment function between the disc and the brake pad.

That is, in the normal braking function, when the brake pedal is pressed, the motor 17 rotates under the control of the ECU 13, the linear movement block 16 moves linearly along the motor shaft 18, and the interlocking rod 15 And the connecting rod 14 and the moving plate 4 move together in the same direction. When the movable plate 4 is moved, the movable plate 4 and the brake pad 2 are moved to the side of the disk 1 by the operating surfaces 4a and 5a and the wedge rollers 6 having a thread shape. As the pressure is brought into contact with the side surface of the disc 1, a braking force is generated by frictional force, thereby normal braking is achieved.

When the gap between the disc 1 and the brake pad 2 becomes larger than the pre-wear state (initial state) of the brake pad 2 due to the wear of the brake pad 2, the disc 1 and the brake 1 The gap between the brake pads 2 is automatically adjusted to the initial state.

That is, in the initial state before the brake pad 2 is worn out, when the motor 17 rotates by the rotational speed of R1, the brake pad 2 is pressed onto the disk 1 to brake. However, when the brake pad 2 is worn and the gap is widened, the brake pad 2 does not come into contact with the disk 1 even if the motor 17 rotates by the rotational speed of R1, thereby preventing the braking force.

Accordingly, the ECU 13 recognizes the situation and operates the solenoid 12 together with the motor 17 to depress the brake pedal during braking to separate the switch lever 11 from the latch 8c. When the switch lever 11 is separated, the screw shaft 8b is freely rotated with respect to the support nut 9 by the force of the adjuster spring 10, and thus the push rod 8 is removed from the support nut 9. As it protrudes, the base plate 5 is pressed against the disk 1. When the base plate 5 is moved toward the disc 1 by the pressing force of the push rod 8, the wedge roller 6, the moving plate 4, and the brake pad 2 are moved together. The brake pad 2 is pressed against the side of the disk 1 to generate a braking force by the friction force.

In other words, when the motor 17 is rotated by the number of revolutions of R1, the adjust unit 7 forcibly moves the brake pad 2 by the gap generated by the wear of the brake pad 2 so that the disk 1 Contact with. The movement of the push rod 8 protruding from the support nut 9 is fixed by the engagement of the latch 8c and the switch lever 11 by the solenoid 12 operating under the control of the ECU 13. Therefore, even when the brake pad 2 is separated from the disk 1 after the braking is completed, the clearance between the disk 1 and the brake pad 2 remains the same as the initial state before the wear of the brake pad 2. In the next operation, even when the motor 17 rotates by the number of revolutions of R1, the brake pad 2 is compressed to the disk 1 to perform normal braking.

However, the conventional electronic wedge brake device as described above has a disadvantage in that the failure rate is high due to the use of the solenoid 12, which is an electronic component, resulting in low stability and high cost as an electronic circuit configuration is required. There was this.

Accordingly, the present invention has been made to solve the above problems, by providing an electronic wedge brake device for the vehicle mechanically operated without using the solenoid which is an electronic component, it is possible to increase the stability by reducing the failure rate, Furthermore, the aim is to enable cost reduction.

Electronic wedge brake device for automobiles according to the present invention for achieving the above object is a linear movement block coupled to the shaft of the motor driven by the control of the electronic control unit to move along the longitudinal direction of the shaft when the shaft rotates. and; A wedge unit coupled to the brake pad for pressing the disk to contact the brake pad with the disk or short-circuit the brake pad in contact with the disk according to the movement of the linear movement block; An adjust unit installed to contact the wedge unit and providing a force for pressing the wedge unit toward the disc; An adjust control mechanism, one end of which is connected to the linear moving block and the other end of which is selectively connected to the adjust unit, to selectively restrain the operation of the adjust unit according to the movement of the linear moving block; It is characterized by.

The wedge unit may include: a movable plate installed to move along a radial direction of the disk in conjunction with the linear movement block while one surface is coupled to the brake pad and a threaded operation surface is formed on the other surface; A base plate having a threaded operation surface formed on one surface facing the moving plate and having the other surface in contact with the adjust unit; And a wedge roller installed between the operating surface of the movable plate and the operating surface of the base plate to move in rolling motion according to the movement of the movable plate.

The adjust unit includes: a push rod having a head in contact with the base plate, a screw shaft having one end connected to the head, and a latch formed at the head; A support nut fixed to a housing coupled to a wedge caliper while being screwed with the screw shaft to allow the screw shaft to rotate freely; An adjust spring is provided to support both ends of the push rod and the support nut to provide a force for pressing the push rod toward the base plate.

The adjust control mechanism includes a rotating lever rotatably installed at one end of the housing via a hinge; A latch stopper having one end coupled to the rotary lever and the other end having a gear groove coupled with the latch and the gear to engage with the latch according to the rotation of the rotary lever; ; A lever spring installed at both ends of the rotary lever and supported at both ends of the rotary lever to provide an elastic return force to the rotary motion of the rotary lever; And a lever rod installed to connect the linear movement block and the rotary lever so that the rotary lever rotates in association with the linear movement block.

The push rod and the push rod when the push rod is inserted into the support nut rather than the frictional force of the screw surface that the push rod and the support nut contact each other when the push rod protrudes from the support nut The angle between the front side toward the head with respect to the horizontal line extending horizontally the vertices of the mountain from the screw shaft of the push rod to make the friction between the threaded surfaces in which the support nuts contact each other is greater than the rear side angle. Formed large; The screw surface of the support nut is formed in parallel with the screw surface of the push rod;

The electronic wedge brake device according to the present invention is configured to use mechanical components that interlock with the operation of the motor without using solenoids, which are electronic components, so that electronic errors and defects caused by using electronic components can be eliminated. As a result, it is possible to ensure more stable performance and further reduce costs.

1 is a configuration diagram for explaining a conventional electronic wedge brake device for a vehicle,
Figure 2 is a block diagram for explaining the electronic wedge brake device for automobiles according to the present invention.

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

The electronic wedge brake device for a vehicle according to the present invention is installed at intervals between the disk 51 rotating together with the wheel and the disk 51 on both sides of the disk 51 as shown in FIG. 2. Combined with the brake pad 52 and the shaft 55 of the motor 54 driven by the control of the ECU 53 to move along the longitudinal direction of the shaft 55 when the shaft 55 rotates. Coupled to the linear movement block 56 and the brake pad 52 to contact the brake pad 52 with the disk 51 according to the movement of the linear movement block 56 or the disk 51. A wedge unit 60 for contacting and shorting the brake pad 52 in contact with the wedge unit, and provided to contact the wedge unit 60 to provide a force for pressing the wedge unit 60 toward the disc 51. Once in the adjust unit 70 and the linear movement block 56 And the other end connected to the adjust unit 70 so as to selectively contact the adjust control mechanism 80 to selectively restrain the operation of the adjust unit 70 according to the movement of the linear movement block 56. It is configured to include).

The wedge unit 60 has one surface coupled to the brake pad 52 and a threaded operating surface 61a formed on the other surface thereof, and interlocked with the linear movement block 61 to adjust the radial direction of the disk 51. A base plate installed so that the movable plate 61 and the movable plate 61 provided to move along the movable plate 61 and the operating surface 62a having a thread shape on one surface facing the movable plate 61 and the other surface is in contact with the adjust unit 70 ( 62 and a wedge roller which is inserted between the operating surface 61a of the movable plate 61 and the operating surface 62a of the base plate 62 to perform rolling motion according to the movement of the movable plate 61. 63).

Here, the front movement block 56 and the movable plate 61 is a structure that is connected to the power transmission through the interlocking rod 64 and the connecting rod 65, the front movement block 56 and the movement It is not necessary to use two rods 64 and 65 for the connection of the plate 61, and one or other link mechanisms may be used as necessary.

The adjust unit 70 includes a head 71a in contact with the base plate 62, a screw shaft 71b having one end connected to the head 71a, and a latch 71c formed in the head 71a. And a support nut 72 fixed to the housing 66 coupled to the wedge caliper while being screwed with the screw shaft 71b so that the screw rod 71b can freely rotate. And an adjust spring (73) provided at both ends of the push rod (71) and the support nut (72) to provide a force for pressing the push rod (71) toward the base plate (62). do.

Here, the screw shaft 71b of the push rod 71 and the support nut 72 are coupled to each other by a screw fastening method, but the screw shaft 71b of the push rod 71 is the adjust spring 73. It is possible to move in a direction protruding from the support nut 72 while smoothly rotating in one direction with respect to the support nut 72 by the force of (), and also the push rod 71 of the adjust spring (73) When the external force acts to overcome the force, the push rod 71 is configured to move in the direction inserted into the support nut 72 while smoothly rotating in the other direction with respect to the support nut 72. This structure is called non-self locking.

In addition, the housing 66 coupled to the wedge caliper has a structure in which the motor 54 is also fixedly installed.

The adjust control mechanism (80) has one end coupled to the housing (66) rotatably via a hinge (81a), one end coupled to the rotary lever (81), and the other end to the latch. A latch stopper 82 provided with a gear groove that is engaged with the gear 71 by engagement with the latch stopper 82 that is engaged with or engaged with the latch 71c according to the rotation of the rotary lever 81; The lever spring 83 is provided so that both ends of the rotary lever 81 and the housing 66 are supported to provide a resilient return force to the rotation of the rotary lever 81, and the linear movement block. It consists of a lever rod 84 installed to connect the linear movement block 56 and the rotary lever 81 so that the rotary lever 81 can rotate in conjunction with (56).

On the other hand, according to the present invention, when the push rod 71 moves from the support nut 72, the push rod 71 and the support nut 72 are in contact with each other. Rather than frictional force, the frictional force of the threaded surfaces 71e and 72b in which the pushrod 71 and the support nut 72 come into contact with each other when the push rod 71 moves into the support nut 72 is moved. This is a larger structure.

This is because the push rod 71 moves in one direction with respect to the support nut 72 when the push rod 71 moves from the support nut 72 by the force of the adjust spring 73. To smoothly protrude from the support nut 72 while rotating smoothly (Non-self locking function), on the contrary, the push rod 71 overcomes the force of the adjust spring 73 and the support nut 72. This is to implement the self locking function by increasing the friction between the push rod 71 and the support nut 72 when the movement is inserted into.

To this end, the angle between the front side (α) toward the head portion (71a) relative to the horizontal line (C1) horizontally extending the vertex of the mountain in the screw shaft (71b) of the push rod 71 between the rear side It is formed larger than the angle β, and the threaded surfaces 72a and 72b of the support nut 72 have a structure formed in parallel with the threaded surfaces 71d and 71e of the push rod 71.

Hereinafter, the operation of the electronic wedge brake device according to the present invention will be described.

First, the electronic wedge brake device according to the present invention can perform a normal braking function.

That is, when the brake pedal is pressed, the motor 54 rotates under the control of the ECU 53, the linear movement block 56 linearly moves along the motor shaft 55, and the linkage rod 64 and the connecting rod ( 65) and the moving plate 61 move together in the same direction.

When the movable plate 61 is moved, the movable plate 61 and the brake pad 52 are moved to the side of the disk 51 by the operating surfaces 61a and 62a and the wedge roller 63 formed in a thread shape. As the pressure is brought into contact with the side surface of the disk 51, a braking force is generated by the friction force, thereby normal braking is achieved.

In addition, the electronic wedge brake apparatus according to the present invention may perform an automatic gap adjustment function between the disk 51 and the brake pad 52.

In other words, when the gap between the disc 51 and the brake pad 52 becomes larger than the pre-wear state (initial state) of the brake pad 52 due to the wear of the brake pad 52, the disc 51 at the time of braking And the gap between the brake pad 52 is automatically adjusted to the initial state.

That is, in the initial state before the brake pad 52 is worn out, when the motor 54 rotates by the rotational speed of R1, the brake pad 52 is compressed to the disk 51 to brake.

However, when the brake pad 52 is worn and the gap is widened, the brake pad 52 does not come into contact with the disc 51 and thus does not generate a braking force even if the motor 54 rotates by the rotational speed of R1.

Therefore, when the linear movement block 56 is moved by the driving of the motor 54, the linear movement block 56 is transferred to the rotation lever 81 via the lever rod 84, and the rotation lever 81 ) Rotates clockwise or counterclockwise about the hinge 81a in the state of FIG. 2, and thus the latch stopper 82 is separated from the latch 71c.

When the latch stopper 82 is separated from the latch 71c, the screw shaft 71b freely rotates with respect to the support nut 72 by the force of the adjust spring 73, and thus the push rod 71 is supported. The base plate 62 is pressed toward the disc 51 while protruding from the nut 72.

When the base plate 62 is moved toward the disc 51 by the pressing force of the push rod 71, the wedge roller 63, the moving plate 61, and the brake pad 52 move together, and eventually Since the brake pad 52 is pressed against the side surface of the disk 51, the brake pad 52 generates a braking force due to frictional force.

In other words, when the motor 54 is rotated by the number of revolutions of R1, the adjust unit 70 forcibly moves the brake pad 52 by the gap generated by the wear of the brake pad 52 so that the disk 51 is rotated. Contact with.

In addition, the movement of the push rod 71 protruding from the support nut 72 is controlled by the latch stopper 82 and the latch 71c by the opposite rotation operation of the motor 54 operating under the control of the ECU 53. It is fixed by engaging a gear.

Therefore, even if the brake pad 52 is separated from the disk 51 after the braking is completed, the gap between the disk 51 and the brake pad 52 is kept the same as the initial state which is the state before the wear of the brake pad 52. In the next operation, even when the motor 53 is rotated by the number of revolutions of R1, the brake pad 52 is squeezed by the disk 51 to perform normal braking.

As described above, the electronic wedge brake device according to the present invention does not use the solenoid 12, which is an electronic component, as compared with the conventional apparatus described above with reference to FIG. 1, and thus is generated by using the electronic component. There is an advantage that can eliminate the electronic errors and defects, and as a result there is an advantage that can ensure a more stable performance and further reduce the cost compared to the conventional device.

51-Disc 52-Brake Pads
53-electronic control unit (ECU) 54-motor
56-linear motion block 60-wedge unit
70-adjust unit 80-adjust control mechanism

Claims (5)

The linear movement block 56 coupled with the shaft 55 of the motor 54 driven by the control of the electronic control unit 53 and moving along the longitudinal direction of the shaft 55 when the shaft 55 rotates. )and;
Coupled to the brake pad 52 for pressing the disk 51 to contact the brake pad 52 with the disk 51 or the disk 51 in accordance with the movement of the linear movement block 56. A wedge unit (60) contacting and shorting the brake pads (52);
An adjust unit (70) installed to contact the wedge unit (60) to provide a force for pressing the wedge unit (60) toward the disk (51);
One end is connected to the linear movement block 56 and the other end is installed to be selectively contacted with the adjust unit 70 to operate the adjust unit 70 according to the movement of the linear movement block 56. An adjust control mechanism (80) for selectively restraining;
Electronic wedge brake device for automobile comprising a. The method of claim 1, wherein the wedge unit 60,
One surface is coupled to the brake pad 51 and threaded operation surfaces 61a and 62a are formed on the other surface thereof, and interlocked with the linear movement block 56 to move along the radial direction of the disk 51. A moving plate 61;
A base plate 62 formed with a threaded operation surface 61a, 62a on one surface facing the movable plate 61 and having the other surface in contact with the adjust unit 70;
A wedge roller (63) installed between the operating surface (61a) of the movable plate (61) and the operating surface (62a) of the base plate (62) to move in rolling motion as the movable plate (61) moves;
Electronic wedge brake device for cars, characterized in that consisting of. The method of claim 2, wherein the adjust unit 70,
Push rod 71 having a head portion 71a in contact with the base plate 62, a screw shaft 71b having one end connected to the head portion 71a, and a latch 71c formed in the head portion 71a. )Wow;
A support nut (72) fixed to a housing (66) coupled to a wedge caliper while being screwed with the screw shaft (71b) to allow the screw shaft (71b) to freely rotate;
An adjust spring (73) installed at both ends of the push rod (71) and the support nut (72) to provide a force for pressing the push rod (71) toward the base plate (62);
Electronic wedge brake device for cars, characterized in that consisting of. The method of claim 3, wherein the adjust control mechanism 80,
A rotation lever (81) rotatably installed at one end of the housing (66) via a hinge (81a);
One end is coupled to the rotary lever 81 and the other end is provided with a gear groove that is engaged with the latch 71c and the gear is engaged so that the engagement is engaged with the latch 71c according to the rotation of the rotary lever 81. A latch stopper 82 operative to achieve or to disengage;
A lever spring 83 installed at the other end of the rotary lever 81 and the housing 66 so as to support both ends thereof to provide a resilient return force to the rotational operation of the rotary lever 81;
A lever rod (84) installed to connect the linear movement block (56) and the rotary lever (81) so that the rotary lever (81) rotates in association with the linear movement block (56);
Electronic wedge brake device for cars, characterized in that consisting of. The screw rods 71d and 72a of claim 4, wherein the push rod 71 and the support nut 72 contact each other when the push rod 71 moves from the support nut 72. Than friction
When the push rod 71 is moved into the support nut 72, the frictional force of the screw surfaces 71e and 72b in which the push rod 71 and the support nut 72 come into contact with each other is greater. To make sure
The angle between the front side α toward the head portion 71a with respect to the horizontal line C1 horizontally extending the vertex of the mountain from the screw shaft 71b of the push rod 71 is the rear side angle β Greater than);
The screw surfaces (72a, 72b) of the support nut (72) are formed in parallel with the screw surfaces (71d, 71e) of the push rod (71);
Electronic wedge brake device for automobiles, characterized in that.

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