KR20180135718A - Electronic disc brake - Google Patents

Abstract

The present invention relates to an electronic disc brake which can prevent a shock and noise caused by a wobble of a nut spindle when a vehicle is driven on an irregular road, and can maintain an optimal state of operation performance of a device by preventing the nut spindle from sagging. According to the present invention, the electronic disc brake comprises a pair of friction pads, a carrier, a caliper housing, and a pressurization unit.

Description

[0001] ELECTRONIC DISC BRAKE [0002]

The present invention relates to an electric disc brake, more particularly, to prevent impact and noise caused by shaking of a nut spindle when driving on an irregular road, to prevent deflection of a nut spindle, The present invention relates to an electric disk brake.

Generally, an electric disk brake adopts a motor which is operated by electricity as a power source of a driving device for pressing a friction pad unlike a conventional hydraulic disk brake.

Such an electric disk brake is provided with a motor for forward rotation and reverse rotation for releasing braking and braking, a gear portion coupled to the rotation shaft of the motor, and a pressure portion for pressing and depressurizing the friction pad, Member.

Here, the pressing member of the electric disk brake is constituted by a piston which forms a space portion therein, and a nut spindle which pushes and pulls the friction pad while moving back and forth in the space portion of the piston.

However, the conventional electric disk brake has a structure in which, when a vehicle runs on an irregular road, when a clearance is formed between the nut spindle and the piston, impact and noise due to shaking of the nut spindle may occur.

A prior art related to the present invention is Korean Patent Laid-Open Publication No. 10-2014-0042746 (Apr. 07, 2014), which discloses a disc brake apparatus.

It is an object of the present invention to prevent shock and noise caused by shaking of a nut spindle when an irregular road is run by keeping a gap between a nut spindle and a piston by coupling a buffer member to the outside of the nut spindle, So that it is possible to maintain the operating performance of the apparatus in an optimal state.

The electric disc brake according to the present invention includes a pair of friction pads for pressing a disc, a carrier for supporting the friction pads, a caliper housing movably supported on the carrier for pressing the friction pads, And a pressing unit for pressing the friction pad in the disk direction, wherein the pressing unit includes: a piston movably installed in the caliper housing so as to press any one of the friction pads; A spindle threadably engaged with a rear end of the nut spindle; and a driving unit that is coupled to the spindle and transmits a rotational force, wherein a ring-shaped shock absorber is provided on the outside of the nut spindle, And the edge side end of the cushioning member is connected to the piston And the inner surface is elastically supported so as to be slidable back and forth.

The cushioning member may include a ring-shaped coupling ring coupled to surround the outer periphery of the nut spindle, and a plurality of support ends protruding outward from the edge-side end of the coupling ring to elastically support the inner surface of the piston .

In addition, it is preferable that at least one air communication hole is formed in the coupling ring so as to pass through the inner and outer diameters so that air can pass therethrough.

The nut spindle further includes a small diameter portion whose outer surface is spaced apart from the inner surface of the piston by a smaller diameter and is screwed to a rear end of the nut spindle and a front end of the small diameter portion, And a large-diameter portion for advancing the piston in the pressing direction is formed at the front end at the time of advancement, and an outer surface of the small- It is preferable that at least one or more engaging grooves are recessed so that the rear end of the engaging ring is engaged.

In addition, it is preferable that a rear end of the coupling ring is formed with at least one press-in end protruding rearward to press the outer surface of the small diameter portion by a press-in method to form the engagement groove.

In addition, it is preferable that at least one or more insertion grooves are concavely formed on the edge side of the large diameter portion so that the support end is positioned.

In addition, it is preferable that a plurality of the insertion grooves are formed, and the support ends are positioned in a state where one pair is spaced apart from each other in the insertion groove.

The support end may include a first inclined portion bent in an inclined manner from the edge side end of the engagement ring and positioned in the insertion groove, and a second inclined portion bent and extended forwardly downwardly from the extended end of the first inclined portion toward the inner diameter side A second inclined portion positioned in the insertion groove, and a contact portion formed to be convex upward at a connection portion between the first inclined portion and the second inclined portion and having an outer end slidably in close contact with the inner surface of the piston .

Further, it is preferable that the contact portion is roundly bent along the front-rear direction.

Further, it is preferable that a connecting portion formed by bending roundly along the front-rear direction is further formed at the connecting portion between the edge side end of the coupling ring and the first inclined portion.

Preferably, the front end of the first inclined portion is spaced apart from the bottom surface of the insertion groove, and the outer end of the contact portion is protruded to the outside of the insertion groove and is in close contact with the inner surface of the piston.

The nut spindle further includes a small diameter portion whose outer surface is spaced apart from the inner surface of the piston by a smaller diameter and is screwed to a rear end of the nut spindle and a front end of the small diameter portion, Wherein at least one engaging groove is formed concavely on the outer surface of the small diameter portion so that the rear end of the engaging ring is engaged with the large diameter portion when the piston is moved forward Do.

In addition, it is preferable that a rear end of the coupling ring is formed with at least one press-in end protruding rearward to press the outer surface of the small diameter portion by a press-in method to form the engagement groove.

INDUSTRIAL APPLICABILITY The present invention has the effect of preventing collision noise caused by shaking of the nut spindle when the vehicle is traveling on an irregular road and preventing sagging of the nut spindle, thereby maintaining the optimum performance of the apparatus.

Further, the present invention has the effect that the nut spindle and the buffer member can be easily assembled by forming the air passage hole in the buffer member, and the weight of the apparatus can be reduced because a part of the buffer member is eliminated.

1 is a side cross-sectional view showing an electric disk brake according to the present invention.
FIG. 2 is an exploded perspective view showing a nut spindle and a cushioning member in detail in an electric disk brake according to the present invention. FIG.
3 is a perspective view illustrating a nut spindle and a cushioning member in an electric disk brake according to an embodiment of the present invention.
FIG. 4 is an enlarged cross-sectional view illustrating a state in which a nut spindle and a cushioning member are combined in an electric disk brake according to the present invention.

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

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a side sectional view showing an electric disc brake according to the present invention, and FIG. 2 is an exploded perspective view showing a nut spindle and a buffer member in detail in an electric disc brake according to the present invention.

FIG. 3 is a perspective view illustrating a nut spindle and a cushioning member in detail in an electric disc brake according to an embodiment of the present invention. FIG. 4 is a perspective view illustrating a combined state of a nut spindle and a cushioning member in the electric disc brake according to the present invention. This is an enlarged cross-sectional view of the main part for giving.

1 to 4, an electric disk brake according to the present invention includes a disk 10, a pair of friction pads 20, a carrier 30, a caliper housing 40, a pressing unit 100, And a buffer member (200).

The pressing unit 100 of the electric disk brake according to the present invention includes a piston 110, a nut spindle 120, a spindle 130, and a driving unit 140.

Among the above configurations, the friction pads 20 are installed to be able to advance and retract toward both sides of the disk 10 rotated together with the wheels of the vehicle.

The friction pads 20 are vertically disposed on both sides of the disk 10, and the friction pads 20 are horizontally supported by the carrier 30 fixed to the vehicle body.

The caliper housing 40 is fixed to the vehicle body and includes a caliper body to which a driving unit 140 to be described later is installed, an extension extending from the caliper body in the direction of the friction pad 20, A fingering or the like connected to the extension portion is formed to support the back surface of the substrate.

The piston 110 is for pressing the friction pad 20 in the direction of the disk 10, and the piston 110 is slidably inserted back and forth inside the caliper body.

Here, the piston 110 has a cylindrical shape with a space formed therein, and a nut spindle 120, which will be described later, is inserted into the space so as to be movable back and forth.

The piston 110 is horizontally advanced in the direction of the friction pad 20 by a driving force (hydraulic pressure or mechanical thrust) of the driving portion to be described later, or horizontally retreated in a direction opposite to the friction pad 20.

The nut spindle 120 is for pressing the piston 110 in the direction of the friction pad 20 and is movably coupled back and forth inside the piston 50.

Here, the nut spindle 120 is internally formed with a female screw portion that opens rearward so that the spindle 130, which will be described later, is screwed.

The nut spindle 120 includes a small diameter portion 121 whose outer surface is spaced apart from the inner surface of the piston 110 by a smaller diameter and a large diameter portion 121 formed at a front end of the small diameter portion 121 122 are formed.

The small diameter portion 121 is screwed to the rear end of the spindle 130, and a female screw portion that opens rearward is formed within the small diameter portion 121 to have a predetermined diameter.

At least one or more engaging grooves 121a are formed on the outer surface of the small diameter portion 121 so that the rear end of the engaging ring 210 is engaged.

The large diameter portion 122 is brought into close contact with the inner front surface of the piston 110 at the time of advancing toward the friction pad 20 at which time the piston 110 is moved in the direction of the friction pad 20.

At least one or more insertion grooves 122a are formed in a concave shape so that a support end 220, which will be described later, is positioned on an edge side of the large diameter portion 122.

The insertion groove 122a may be formed along the edge side end portion of the large diameter portion 122 and may be formed as an upper pair at the edge side end portion of the large diameter portion 122 as shown in FIGS.

The spindle 130 is screwed to the rear end of the nut spindle 120 so that the male screw portion formed at the front end of the spindle 130 is screwed from the rear of the nut spindle 120 to the female screw portion.

A rotational force is transmitted from the motor 142 in a state where the rear end of the spindle 130 is coupled to the rotation shaft of the speed reducer 141 to be described later.

The spindle 130 may be resiliently supported by an elastic member (not shown) inside the caliper body, and a bearing (not shown) may be installed inside the caliper body for supporting the spindle 130 have.

The driving unit 140 is coupled to the rear end of the spindle 130 so as to transmit a rotational force. The driving unit 140 includes a speed reducer 141 installed inside the caliper body, And a motor 142 for rotating the motor 142 in the direction of rotation.

Here, the speed reducer 141 may include a plurality of gears (not shown). The speed reducer 141 amplifies the rotational force of the motor 142 with the reduction ratio of the gears, and transmits the amplified rotational force to the spindle 130.

For example, when the motor 142 is driven for braking, the speed reducer 141 connected to the motor 142 is rotated. The speed reducer 141 is rotated by the rotational force of the motor 142 to rotate the spindle 130 ).

The nut spindle 120 is advanced by the rotation of the spindle 130 and the nut spindle 120 pushes the piston 110 in the direction of the friction pad 20, And presses the friction pad 20 in the disk direction by the spindle 120.

The cushioning member 400 is coupled to the outside of the nut spindle 120, and the cushioning member 400 can be manufactured using a metal material having constant strength and elasticity.

The cushioning member 400 as described above elastically supports the inner surface of the above-described piston 110 such that the edge thereof is slidable back and forth.

More specifically, the cushioning member 200 includes a ring-shaped coupling ring 210 coupled to the outside of the piston 110, and a plurality of support ends 220 protruding from the edge of the coupling ring 210 Is formed.

The coupling ring 210 is coupled to the outer surface of the nut spindle 120 and a hollow 211 corresponding to the outer surface of the nut spindle 120 is inserted into the coupling ring 210, do.

The front end of the coupling ring 210 is bent toward the outer diameter side to form a wider diameter and the front end of the coupling ring 210 is engaged with the rear face of the large diameter portion 122 to be described later.

At the rear end of the coupling ring 210, at least one press-in end 213 is formed to protrude rearward so as to press the outer surface of the small diameter portion 121 in a press-fitting manner to form the engagement groove 121a.

The press-in end 213 protrudes from the rear end of the engagement ring 210, and the press-in end 213 is disposed in a spaced-apart relation along the circumferential direction of the engagement ring 210.

The press-in end 213 may be sloped to a predetermined depth on the outer surface of the small-diameter portion 121 by a press-fitting method.

At this time, a locking groove 121a is formed in the outer surface of the small diameter portion 121 so that the protruding end of the press-in end 213 is latched rearward.

The front end of the coupling ring 210 is engaged with the rear surface of the large diameter portion 122 and the rear end of the coupling ring 210 is engaged with the coupling groove 121a. It can be firmly fixed to the neck portion 121.

Further, in the coupling ring 210, At least one air passage hole 212 is formed to pass through the inside diameter and the outside diameter direction so that air can be communicated.

The air passage hole 212 prevents air from remaining between the coupling ring 210 and the nut spindle 120 when the coupling ring 210 is coupled to the outside of the nut spindle 120.

For example, when the coupling ring 210 is inserted through the rear portion of the small diameter portion 12, air between the coupling ring 210 and the nut spindle 120 passes through the air passage hole 212 to the outside It can be discharged quickly.

The support end 220 protrudes to the outside from the edge side end of the coupling ring 210 to elastically support the inner surface of the piston 110 so that the edge side end of the large diameter portion 122 is spaced apart from the inner surface of the piston 110 .

The support end 220 may be bent forward and be positioned in the insertion groove 122a and the outer end of the support end 220 may be in close contact with the inner surface of the piston 110. [

2 and 3, the pair of support ends 220 may be spaced apart from each other in the insertion groove 122a.

At this time, since the opposite end of the support ends 220 is located inside the insertion groove 122a, the support ring 220 does not rotate the coupling ring 210 in the circumferential direction.

More specifically, the supporting end 220 may be divided into a first inclined portion 221, a second inclined portion 222, and a contact portion 223.

First, the first inclined portion 221 is bent in an inclined manner toward the outer diameter side opposite to the piston 110 from the edge side end of the coupling ring 210, and is positioned in the insertion groove 122a.

The second inclined portion 222 extends from the extended end of the first inclined portion 221 to the inner diameter side where the piston 110 is located and extends in an inclined manner and is located in the insertion groove 122a, May be spaced apart from the bottom surface of the insertion groove 122a.

The contact portion 223 is convex upward at a connection portion between the first slope portion 221 and the second slope portion 222 and the outer end of the contact portion 223 slides forward and backward on the inner surface of the piston 110 As close as possible.

4, the outer end of the contact portion 223 may protrude to the outside of the insertion groove 122a and may be in close contact with the inner surface of the piston 110. [

Further, the contact portion 223 And the outer end of the contact portion 223 is formed into a convex curved surface along the front-rear direction.

Further, a connection portion 224 may be formed at the connection portion between the edge side end of the coupling ring 210 and the first inclined portion 221 to be roundly bent along the forward and backward directions.

Since the outer end of the contact portion 223 has a predetermined curvature along the front-rear direction, the nut spindle 120 can smoothly slide while being in close contact with the inner circumferential surface of the piston 110 when moving back and forth.

In addition, when the support end 200 is positioned below the nut spindle 120, the nut spindle 120 can be prevented from falling down by its own weight, and the installation position of the nut spindle 120 can be varied Can be prevented.

The connecting portion 224 is a portion connecting the rear end of the first inclined portion 221 and the edge side end of the coupling ring 210. The outer end of the connecting portion 224 is formed as a curved surface convex along the forward and backward direction.

Since the connecting portion 224 forms a convex curved surface, the connecting portion 224 can exert a constant elastic force without being easily broken even when a repetitive impact is transmitted to the contact portion 223.

As a result, the present invention can prevent collision noise due to shaking of the nut spindle 120 when the vehicle is traveling on irregular roads, prevent sagging of the nut spindle 120, and optimize the operation performance of the apparatus Can be maintained.

In addition, the present invention can easily assemble the nut spindle 120 and the buffer member 200 by forming the air passage hole 212 in the buffer member 200, and a part of the buffer member 200 is removed, Can be reduced.

Although the embodiments of the electric disk brake according to the present invention have been described above, it is apparent that various modifications may be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by the scope of claims of the patent as well as the claims of the patent registration described later.

That is, it should be understood that the above-described embodiments are illustrative and non-restrictive in all aspects and that the scope of the present invention is defined by the appended claims rather than the detailed description, Ranges and equivalents thereof are to be construed as being included within the scope of the present invention.

10: Disc 20: Friction pad
30: carrier 40: caliper housing
100: pressure unit 110: piston
120: nut spindle 121: small diameter neck
121a: Retaining groove 122:
122a: insertion groove 130: spindle
140: Driving unit 141: Reduction gear
142: motor 200: buffer member
210: coupling ring 211: hollow
212: air passage hole 213: indentation end
220: supporting end 221: first inclined portion
222: second inclined portion 223:
224:

Claims (13)

A pair of friction pads for pressing the disk, a carrier for supporting the friction pads, a caliper housing movably supported on the carrier for pressing the friction pads, and a pressing member An electric disc brake comprising:
The pressing unit includes a piston movably installed in the caliper housing so as to press any one of the friction pads, a nut spindle coupled to the inside of the piston and moving the piston forward and backward, And a driving unit that is rotatably coupled to the spindle and transmits rotational force,
Wherein a ring-shaped buffer member is coupled to the outside of the nut spindle, and an edge side end of the buffer member resiliently supports the inner surface of the piston so as to be slidable back and forth. The method according to claim 1,
The cushioning member,
A ring-shaped coupling ring engaged in a state of wrapping the outer periphery of the nut spindle,
And a plurality of support ends protruding from an edge side end of the coupling ring to elastically support the inner surface of the piston. The method of claim 2,
In the coupling ring,
Wherein at least one air communication hole is formed to pass through the inner and outer diameters so that air can pass therethrough. The method of claim 2,
The nut spindle includes:
A small diameter portion whose outer surface is spaced apart from the inner surface of the piston by a smaller diameter and in which the spindle is screwed to the rear end,
A large diameter portion formed at a front end of the small diameter portion to engage the front end of the coupling ring and to have a front end for advancing the piston in the pressing direction during forward movement,
On the outer surface of the small diameter portion,
And at least one engaging groove is formed concavely so that the rear end of the engaging ring is engaged. The method of claim 4,
At the rear end of the coupling ring,
And at least one press-in end is formed to protrude rearward to press the outer surface of the small-diameter portion by press-fitting so as to form the engaging groove. The method of claim 4,
At the edge side end of the large diameter portion,
And at least one insertion groove is recessed so that the support end is positioned. The method of claim 6,
The insertion groove
And is formed in a plurality of,
The supporting end may be,
And a pair of the inner race and the outer race are positioned so as to be spaced apart from each other in the insertion groove. The method according to claim 2 or 6,
The supporting end may be,
A first inclined portion extending in an inclined manner from the edge side end of the engaging ring toward the outer diameter side and positioned in the insertion groove,
A second inclined portion bent forwardly and downwardly inclined from an extended end of the first inclined portion to an inner diameter side and positioned in the insertion groove,
Wherein a contact portion is formed which is convex upward at a connection portion between the first inclined portion and the second inclined portion and whose outer end is slidably brought into close contact with the inner surface of the piston. The method of claim 8,
The contact portion
Wherein the bending is formed by rounding along the front-rear direction. The method of claim 8,
At the connecting portion between the edge side end of the coupling ring and the first inclined portion,
Further comprising a connecting portion formed by bending round-shaped along the front-rear direction. The method of claim 8,
The front end of the first inclined portion
And a second engaging portion that is located apart from the bottom surface of the insertion groove,
The outer end of the contact portion
And the protrusion protrudes outside the insertion groove and is brought into close contact with the inner surface of the piston. The method of claim 2,
The nut spindle includes:
A small diameter portion whose outer surface is spaced apart from the inner surface of the piston by a smaller diameter and in which the spindle is screwed to the rear end,
A large diameter portion formed at a front end of the small diameter portion to engage the front end of the coupling ring and to have a front end for advancing the piston in the pressing direction during forward movement,
On the outer surface of the small diameter portion,
And at least one engaging groove is formed concavely so that the rear end of the engaging ring is engaged. The method of claim 12,
At the rear end of the coupling ring,
And at least one press-in end is formed to protrude rearward to press the outer surface of the small-diameter portion by press-fitting so as to form the engaging groove.

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