KR20220019409A - Apparatus for Vehicle Braking - Google Patents

Abstract

Provided is a braking apparatus for a vehicle. According to one embodiment of the present invention, the braking apparatus for a vehicle comprises: a first caliper including a caliper body, a piston mounted on one side of the caliper body and moving forward and backward, a first friction pad placed on one end of the piston, a second friction pad fixed on the other side of the caliper body, and a driving unit providing driving force for moving the piston forward and backward; and a disc unit including a disc core rotating around a rotary shaft, a plurality of guide pines engaged with an outer side surface of the disc core, a guide pin cover coupled to the disc core and the guide pins, and a disc surrounding at least a part of the disc core, rotating coaxially with the disc core, and movable in the direction parallel to the rotary shaft. At least some of the plurality of guide pins have a groove shape formed on the middle, and the groove shape is coupled to a damper. The braking apparatus for a vehicle is capable of securing stability of dynamic quality.

Description

Vehicle Braking System {Apparatus for Vehicle Braking}

An embodiment of the present disclosure relates to a braking system for a vehicle.

The content described in this section merely provides background information for the present disclosure and does not constitute the prior art.

Electro-Mechanical Brake (EMB) has been developed and is widely used. The electric brake has been developed as an Electronic Parking Brake (EPB), but its use has recently been expanded as a main brake replacing the conventional hydraulic braking. The EMB is a device in which an actuator driven by a motor is mounted on a brake caliper, and the vehicle is directly braked by motor driving force without a medium called brake fuel. The EMB has a mechanism similar to that of the Electronic Parking Brake (EPB), but unlike the EPB, it is mainly used for main braking, and thus requires higher braking response and operational durability than the EPB. In addition, the electric brake has a simpler structure, faster braking response speed, and more precise control than a hydraulic brake, thereby improving braking safety.

Conventional types of calipers used in electric brakes include floating type caliper and fixed type caliper. In the case of a floating caliper, when the piston applies pressure to the disk from one side, the caliper body moves in the opposite direction to the pressing direction in response to the applied force, thereby clamping the disk. Due to this, a braking force is applied. On the other hand, in the case of a fixed caliper, when the pistons apply pressure to the disk from both sides, only the friction pad moves while the caliper body is fixed, thereby clamping the disk. Due to this, a braking force is applied.

The fixed caliper has the advantage of being superior in appearance and braking performance than the floating caliper. However, in the electric brake, the fixed caliper has a problem in that the instability of dynamic performance increases, such as a larger size and heavier weight compared to a floating caliper.

Accordingly, an object of the present disclosure is to secure the stability of the dynamic quality of the fixed caliper in the electric brake, for example, to prevent the caliper from shaking during non-braking.

According to an embodiment of the present disclosure, a caliper body, a piston mounted on one side of the caliper body and configured to move forward and backward, a first friction pad disposed at one end of the piston, and the caliper body a first caliper including a second friction pad fixed to the other side of the second friction pad, and a driving unit providing a driving force for moving the piston forward and backward; and a disk core rotating about a rotation axis, a plurality of guide pins coupled to an outer surface of the disk core, a guide pin cover coupled to the disk core and the guide pins, and a disk core and a disk unit surrounding at least a portion of the disk core and rotating coaxially with the disk core and including a disk movable in a direction parallel to the rotation axis, wherein at least some of the guide pins of the plurality of guide pins are interrupted. There is provided a brake device, characterized in that a groove shape is formed in the groove, and a damper is coupled to the groove shape.

As described above, according to the present embodiment, there is an effect of securing the stability of dynamic quality by assembling the guide pin including the damper to the disk of the fixed caliper among the electric brakes.

1 is a front perspective view of a brake device according to an embodiment of the present invention.
2 is a rear perspective view of a brake device according to an embodiment of the present invention.
3 is an exploded perspective view of a brake device according to an embodiment of the present invention.
4 is an enlarged cross-sectional view of a brake device according to an embodiment of the present invention.
5 is an assembly view of a disk unit according to an embodiment of the present disclosure.
6 is an exploded view of a disk unit according to an embodiment of the present disclosure.
7 is a view showing before and after coupling of the guide pin and the damper according to an embodiment of the present disclosure.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In adding reference numerals to components in each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present disclosure, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present disclosure, the detailed description thereof will be omitted.

In describing the components of the embodiment according to the present disclosure, reference numerals such as first, second, i), ii), a), b) may be used. These signs are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the signs. When a part in the specification 'includes' or 'includes' a certain component, it means that other components may be further included, rather than excluding other components, unless explicitly stated to the contrary. .

1 is a front perspective view of a brake device according to an embodiment of the present invention. 2 is a rear perspective view of a brake device according to an embodiment of the present invention. 3 is an exploded perspective view of a brake device according to an embodiment of the present invention.

1 to 3 , a braking device 100 includes a first caliper 110a, a second caliper 110b (hereinafter referred to as 100) and a disc unit. , 120) in whole or in part.

The first caliper 110a includes a caliper body 130 and a driving unit 140 .

The caliper body 130 is fixedly installed on the vehicle body and is configured to surround at least a portion of the disk 124 installed on the wheel of the vehicle.

The driving unit 140 is attached to one surface of the caliper body 130 and provides driving force for braking the vehicle. The ECU (Electronic Control Unit, not shown) calculates the pressure required for braking based on the driver's braking intention, vehicle speed, steering angle, and driving environment. Power is applied to at least a part of the driving unit 140 to generate the pressure calculated by the ECU, and at least a part of the driving unit 140 is driven.

The driving unit 140 includes an electric motor (not shown) and a gear assembly (not shown). The electric motor provides rotational force, and the gear assembly is configured so that the spindle 103 (refer to FIG. 4 ) linearly moves by the rotational force of the electric motor. The spindle 133 moves in a straight line and moves the piston 102 attached to one end (refer to FIG. 4 ) forward and backward. A typical configuration related to driving of the driving unit 140 in the present disclosure is a technique that is obvious to those skilled in the art, and thus description and illustration thereof will be omitted.

The disk unit 120 is disposed inside the wheel, and at least a portion of the disk unit 120 contacts a portion of one or more calipers 110 to provide a braking force to the wheel. The disk unit 120 includes a disk core 122 and a disk 124 .

The disk core 122 is coupled to a drive shaft (not shown) of the wheel. For example, the drive shaft and the disk core 122 of the wheel may be bolted. The disk core 122 rotates as the drive shaft rotates.

The disk core 122 is preferably a circular plate. The disk core 122 includes one or more first coupling portions 122a and 122b formed from a portion of an outer circumferential surface. At least a portion of the first coupling portions 122a and 122b is coupled to the second coupling portion 124a, and the disk core 122 and the disk 124 are coaxially rotatable.

The disk 124 is disposed such that at least a portion thereof is surrounded by the caliper body 130 . At least a portion of the disk 124 is clamped by the one or more calipers 110 , thereby reducing the rotational force of the wheel and further enabling braking.

The disk 124 is configured to surround at least a portion of the disk core 122 . The inner circumferential surface of the disk 124 surrounds at least a portion of the outer circumferential surface of the disk core 122 . In this case, the disk 124 may be slid on the outer peripheral surface of the disk core 122 . An operation mechanism related thereto will be described in detail with reference to FIG. 4 .

The disk 124 is disposed coaxial with the disk core 122 . The disk 124 rotates according to the rotation of the disk core 122 . That is, as torque generated due to the rotation of the disk core 122 is transmitted to the disk 124 , the disk core 122 may rotate in the same direction and speed as the disk 124 .

The disk 124 includes one or more second coupling portions 124a and 124b. The second coupling portions 124a and 124b are configured to be fitted with the first coupling portions 122a and 122b. As the first coupling portions 122a and 122b and the second coupling portions 124a and 124b are fitted, the disk core 122 and the disk 124 are stably coupled, and the disk 124 provides a separate rotational driving force. Even if there is no driving source provided, it is possible to rotate together with the disk core 122 . Meanwhile, in the present disclosure, it is illustrated that the first coupling portions 122a and 122b are male portions, and the second coupling portions 124a and 124b are female portions. That is, the first coupling portions 122a and 122b protrude from the outer circumferential surface of the disk core 122 in a radially outward direction of the disk core 122 , and the second coupling portions 124a and 124b are separated from the inner circumferential surface of the disk 124 . It is depressed in the radially inward direction of the disk 124 . However, it is not necessarily limited thereto. For example, the first coupling portions 122a and 122b may be formed to be female portions, and the second coupling portions 124a and 124b may be formed to be male portions inserted into the first coupling portions 122a and 122b.

In addition, in the present disclosure, the disk unit 120 is shown to include two pairs of first coupling parts (122a and 122b) and second coupling parts (124a and 124b), but is not necessarily limited thereto, depending on the design It may be one pair or three or more pairs.

The second caliper 110b is disposed symmetrically with respect to the rotation axis of the first caliper 110a and is configured to clamp at least another portion of the disk 124 . When the disk 124 is slidable in a direction parallel to the axis of rotation of the disk unit 120 (hereinafter, referred to as an axial direction), even if the movement distance is about 0.1 mm, vibration is generated in the disk 124 as the vehicle travels. can occur The disk 124 is a rotor, and is made of a heavy material, for example, steel. Accordingly, vibration of the disk 124 may generate noise or affect riding comfort. In this case, when the brake device 100 further includes the second caliper 110b disposed symmetrically with the first caliper 110a, the vibration amplitude of the disc is determined by the brake device 100 including only the first caliper 110a. It is less than 1/2 of the amplitude of vibration. Due to this, it is possible to prevent the problems related to noise and ride comfort described above.

Since the shape and components of the second caliper 110b are the same as those of the first caliper 110a, the description of the first caliper 110a will be replaced. Meanwhile, in the present disclosure, a plurality of calipers 110 having the same specification are disposed on one wheel in order to satisfy the required braking force of the front wheel which is higher than the required braking force of the rear wheel. For this reason, there is an effect of reducing the manufacturing cost compared to the case of using calipers of various specifications.

In addition, the caliper having the high specification drive unit 140 increases in size and weight. On the other hand, since the brake device 100 according to the embodiment of the present invention uses two calipers 110a and 110b, the required specifications of each caliper 110a and 110b are not high, so the size of the calipers 110a and 110b is not high. can be reduced. Accordingly, there is an effect that it is easy to secure the layout of the electromechanical brake device 100 . Here, the securing of the layout means that the degree of freedom in design increases as the sizes of the calipers 110a and 110b decrease. More specifically, when designing the electromechanical brake device 100 , as the size of the calipers 110a and 110b is reduced, a spatial margin is created, which means that the arrangement of other components is diversified.

In addition, when a plurality of calipers 110a and 110b is used, it is advantageous to secure redundancy. It is assumed that a total of six calipers 110 are applied, two each to the front wheel and one to the rear wheel. At this time, when a malfunction occurs in one caliper 110, 83% of backup braking performance corresponding to 5/6 arithmetic also can be secured. Furthermore, when the required braking force required for the front and rear wheels is calculated and distributed appropriately, about 90% or more of backup braking performance can be secured.

4 is an enlarged cross-sectional view of a brake device according to an embodiment of the present invention.

4A shows the brake device 100 in a state in which the braking process is not started. The structure and shape of the caliper body 130 will be described with reference to FIG. 4A . The caliper body 130 includes a hollow type cylinder 131, a piston 132, a spindle 133, a first friction pad 134, and a second friction pad. pad, 135) in whole or in part.

The piston 132 is mounted on one side of the caliper body 130 . The piston 132 is configured to move forward and backward in the axial direction by the driving unit 140 inside the hollow cylinder 131 .

One end of the spindle (not shown) is connected to the piston 132 (conjunction). The piston 132 cannot rotate inside the hollow cylinder 131 and can only move forward and backward in the axial direction. When a driving force is generated from the electric motor, the gear assembly connected to the electric motor transmits the driving force to the spindle 133 . At this time, when the spindle 133 rotates, the piston 132 bolted to the spindle 133 moves forward and backward in the axial direction. The moving direction and the moving distance of the piston 132 correspond to the rotating direction and the rotating amount of the spindle 133 .

The first friction pad 134 is disposed at one end of the piston 132 and is formed to face at least one surface of the disk 124 .

The second friction pad 135 is installed to be spaced apart from the first friction pad 134 , and at least a portion of the disk 124 is disposed between the first friction pad 134 and the second friction pad 135 .

4(b) shows the brake device 100 in a state in which the braking process is started. With reference to FIG. 4B , the operation of the caliper 110 and the disk unit 120 during braking will be described in detail.

The first friction pad 134 presses one surface of the disk 124 in the axial direction as the piston 132 advances. The disk 124 slides in the pressing direction of the first friction pad 134 . At this time, the disk 124 slides on the outer peripheral surface of the disk core 122 . As the disk 124 moves, the other surface of the disk 124 comes into contact with the second friction pad 135 . Due to this, the pair of friction pads 104 and 105 simultaneously compress both surfaces of the disk 124 . Accordingly, a frictional force is generated between the pair of friction pads 104 and 105 and the disk 124, and a braking force to restrain the wheel from rotating is generated by this frictional force. In this process, the caliper body 130 is fixed, and the braking process is performed in such a way that the disk 124 is floating. That is, the electromechanical brake device 100 to which a fixed caliper is applicable may be used.

5 is an assembly view of a disk unit according to an embodiment of the present disclosure;

6 is an exploded view of a disk unit according to an embodiment of the present disclosure;

5 and 6 , FIG. 5 shows after assembly of the disk part 500 , and FIG. 6 shows before assembly of the disk part 500 .

In the detailed description of the present disclosure, FIGS. 5 and 6 will be described in more detail by assembling or disassembling the disk unit 120 of FIG. 1 .

The disk unit 500 of the present disclosure includes a disk core 510 , a plurality of guide pins 520 , a guide pin cover 530 , and a disk 540 . .

Disk core 510 and disk 540 refer to the detailed description of FIG. 2 .

The outer surface of the disk core 510 includes a plurality of assembly grooves 510a. The plurality of assembly grooves 510a are formed in an arc shape larger than a semicircle in order to couple the plurality of guide pins 520 to each other.

The plurality of guide pins 520 are coupled to the assembly groove 510a formed on the outer surface of the disk core 510 . The guide pin 522 transmits the rotational torque of the disk core 510 to the disk 540 .

The plurality of guide pins 520 are designed to have a groove shape at the middle of the guide pin (c1 in FIG. 7 ). The groove shape is formed so that a damper 524 can be coupled thereto. The shape of the groove may be appropriately changed to fit the size of the damper 524 .

The damper 524 is coupled to a middle groove of the guide pin. In one embodiment of the present disclosure, the damper 524 is coupled to the guide pin 522 to prevent shaking during braking. Here, the damper 524 is vibration generated when the vehicle passes through an obstacle, and the damper 524 is between the disk core 510 and the guide pin or between the guide pin 522 and the brake to prevent vibration. It is a component that generates friction and dampens vibration.

The cross section of the damper 524 is formed in a predetermined shape, for example, a square shape. The damper 524 may be made of a flexible material, for example, a rubber material.

The guide pin cover 530 is coupled to the disk core 510 . The guide pin cover 530 supports the guide pin 522 so that the guide pin 522 coupled to the outer surface of the disk core 510 does not separate from the disk core 510 .

After the plurality of guide pins 520 and the guide pin cover 530 are assembled to the disk core 510 , the disk core 510 is coupled to the disk 540 .

7 is a view showing before and after coupling of the guide pin and the damper according to an embodiment of the present disclosure.

Figure 7 (a) is a view showing a state before the coupling of the guide pin 522 and the damper 524 of the present disclosure, Figure 7 (b) is a state after the coupling of the guide pin 522 and the damper (524) It is a drawing showing

Referring to FIG. 7 , a groove shape is formed at the middle of the plurality of guide pins 520 . Here, the groove shape refers to c1. If the shape of the groove will be described in more detail, the shape of the groove is a shape in which one end of the corner and the other end are inclined. Here, the inclined shape is referred to as a chamfer in the detailed description of the present disclosure. Just as the piston mounted on the caliper is rolled back when the braking process is finished, the chamfer of the damper 524 serves to roll back when the braking process of the fixed disk is completed.

Also, in addition to performing a rollback function, the damper 524 serves to maintain the disk 540 in a fixed state without shaking even in a situation in which braking is not required for the vehicle. In the detailed description of the present disclosure, the function of the damper 524 to hold the disk 540 in a fixed state is referred to as an actuation resistance force forming function.

In addition, the damper 524 may be assembled to all the guide pins 522 , but may be assembled only to at least some of the guide pins 522 among the plurality of guide pins 522 for cost reduction. More specifically, the guide pin 522 to which the damper 524 is assembled and the guide pin 522 to which the damper 524 is not assembled may be disposed in a symmetrical shape. In addition, it may be arranged to have an isotropic structure in addition to a symmetrical shape. Here, isotropy means that, in a state in which a plurality of guide pins 520 are coupled to the disk core 510, no matter which direction the disk core 510 is observed, the guide pins 522 to which the damper 524 is coupled according to the viewing direction. and the guide pin 522 to which the damper is not coupled does not change.

The above description is merely illustrative of the technical idea of this embodiment, and various modifications and variations will be possible without departing from the essential characteristics of the present embodiment by those skilled in the art to which this embodiment belongs. Accordingly, the present embodiments are intended to explain rather than limit the technical spirit of the present embodiment, and the scope of the technical spirit of the present embodiment is not limited by these embodiments. The protection scope of this embodiment should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present embodiment.

100: brake device 110a: first caliper
110b: second caliper 120: disk unit
510: disk core 520: a plurality of guide pins
530: guide pin cover 540: disk

Claims (12)

A caliper body, a piston mounted on one side of the caliper body and configured to move forward and backward, a first friction pad disposed at one end of the piston, and fixed to the other side of the caliper body a first caliper including a second friction pad and a driving unit providing a driving force for moving the piston forward and backward; and
A disk core rotating about a rotational axis, a plurality of guide pins coupled to an outer surface of the disk core, a guide pin cover coupled to the disk core and the guide pins, and a disk unit surrounding at least a portion of the disk core, rotating coaxially with the disk core, and including a disk movable in a direction parallel to the rotation axis,
At least some of the guide pins of the plurality of guide pins have a groove shape formed in the middle, and a damper is coupled to the groove shape. According to claim 1,
The damper is a brake device, characterized in that the elastic material. 3. The method of claim 2,
The elastic material is a brake device, characterized in that rubber. According to claim 1,
The at least some of the guide pins are symmetrically coupled to the outer surface of the disk core. According to claim 1,
An assembly groove is formed on the outer surface of the disk core so that the plurality of guide pins are coupled;
The assembly groove is a brake device, characterized in that the arc shape larger than a semicircle. 6. The method of claim 5,
One end and the other end of the assembly groove, the brake device, characterized in that the corner is inclined. According to claim 1,
The remaining guide pins among the plurality of guide pins, the damper is not coupled,
The at least some of the guide pins are coupled to the outer surface of the disc core so as to have an isotropic structure with the remaining guide pins. According to claim 1,
The disk core is connected to the drive shaft of the wheel and rotates by the drive shaft,
The disc is a brake device, characterized in that the drive is driven by the torque (torque) of the disc core. According to claim 1,
The disc is configured to slide along the axis of rotation on an outer circumferential surface of the disc core when the piston advances. According to claim 1,
The disk core includes one or more first coupling portions,
and the disc includes at least one second coupling portion configured to fit with the first coupling portion. According to claim 1,
and a second caliper configured to clamp at least a portion of the disc. 12. The method of claim 11,
The brake device, characterized in that the first caliper and the second caliper are symmetrically disposed with respect to the rotation axis.

Images