JPH10184746A - Disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent initial braking from delaying and abutting noise from being generated, and attain prescribed braking torque from the beginning of braking. SOLUTION: A pad spring 12 is formed with the first contact part 12b which abuts the inside of a hanger pin 11 in the disc radial direction, the first spring part 12c which springs the disc turning-in side of a back plate 4b to the inside in the disc radial direction, the second abutting parts 12f, 12f for applying energizing force in the disc turning-out direction to the first spring part 12c by bringing it into contact with notched stepped-off parts 3i, 3i, and the second spring parts 12g, 12g which spring the disc turning-in side surface of suspending parts 4e, 4e in the disc turning-out direction and presses the disc turning-out side surface of the back plate 4b against the torque receiving part 3k of the disc turning-out side along with the first spring part 12c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake used for a traveling vehicle such as an automobile or a motorcycle.
More specifically, the present invention relates to a structure in which the friction of a friction pad suspended by using one hanger pin on both sides of a disk rotor is suppressed by a pad spring.

[0002]

2. Description of the Related Art As a conventional disk brake for a vehicle in which rattling of a friction pad is suppressed by a pad spring, there is one disclosed in Japanese Utility Model Publication No. 6-45066. In this technology, a single hanger pin is inserted into a suspending portion that extends from the center of the outer surface of each back plate in the radial direction of the disk, and a friction pad is suspended on both sides of the disk rotor so as to be movable in the axial direction of the disk. Then, both ends of the pad spring passing through the inner side of the hanger pin in the radial direction of the disk are elastically contacted with both ends of the outer surface of the back plate in the radial direction of the disk to urge each friction pad inward in the radial direction of the disk. It is designed to prevent rattling due to running vibration.

[0003]

In such a configuration,
The friction pad during braking is slid in the disc unwinding direction by sliding contact with the disc rotor, and the braking force is generated after the disc unwinding side of the friction pad abuts the torque receiving portion on the disc unwinding side of the caliper body As a result, the initial braking is delayed or an unpleasant abutment sound is generated. Further, since the friction pad is hung by one hanger pin, the friction pad pivots on the hanger pin by the drag of the disk rotor, so that the contact with the torque receiving portion is not uniform and braking is performed. A predetermined braking torque may not be obtained at the initial stage.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disk brake for a vehicle which can obtain a predetermined braking torque from an early stage of braking without a delay in initial braking or occurrence of a contact sound.

[0005]

In order to achieve the above object, according to the present invention, a ceiling opening is provided in a bridge portion of a caliper body which straddles the outer periphery of a disk rotor, and a torque on both sides of the disk rotor is provided through the ceiling opening. A single hanger extending in the axial direction of the disk across the disk rotor on the caliper body, with a suspending portion extending from the center of the pair of friction pads disposed between the receiving portions in the radially outer surface of the disk. A pin is inserted into the hanging portion to suspend the friction pad so as to be movable in a disc axial direction, and a pad spring for a vehicle in which a pad spring is contracted between the friction pad and the hanger pin. A first contact portion that contacts the inside of the hanger pin in the radial direction of the disc and a disc reciprocating side of the friction pad are disposed on the pad spring. A first spring portion that rebounds radially inward and a second spring that engages the caliper body on the disk outlet side of the hanger pin to apply a biasing force to the first spring portion in the disk outlet direction. Abutment part,
A second spring portion is provided for resiliently ejecting the disk revolving side surface of the suspension portion in the disk unwinding direction, and pressing the disk revolving side surface of the friction pad against the disk receiving side torque receiving portion together with the first spring portion. It is characterized by that.

[0006] The above-mentioned pad spring may be provided with a third spring portion which resiliently projects the disk feeding side of the friction pad in the radial direction of the disk and in the disk feeding direction.
A cover may be provided to cover the suspension of the friction pad.

According to the structure of the present invention, the urging force in the radial direction of the disk and in the direction in which the disc is ejected acts on the friction pad from the pad spring, and the disc ejection side surface of the friction pad in the non-braking state is previously ejected. It is supported on the torque receiving surface on the side. In the friction pad, a suspension portion, which is a radially outer portion of the disc held by the hanger pin, is urged in the disc ejecting direction by the elastic force of the second spring portion,
The radially inner portion of the disk provided with the lining is the first
Since the spring portion is urged in the disc ejecting direction by the elastic force in the disc ejecting direction, the disc ejecting side surface of the friction pad comes into elastic contact with the torque receiving surface on the disc ejecting side as parallel as possible.

Further, by providing the pad spring with the third spring portion, the resilience of the third spring portion acts on the disc reciprocating side of the friction pad.
In opposition to the elastic force of the spring portion, in the disk ejecting direction, the disc ejecting side surface of the friction pad comes into elastic contact with the torque receiving surface on the disc ejecting side more parallel. If the pad spring is provided with a cover that covers the suspension part of the friction pad, water and earth and sand can be prevented from adhering to the hanger pin and entering the pin hole of the suspension part as much as possible.
The sliding property of the friction pad can be secured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The vehicle disk brake 1 includes a disk rotor 2 that integrally rotates with a wheel (not shown) in the direction of arrow A, a caliper body 3 that is supported on the vehicle body at one side of the disk rotor 2, and a disk rotor 2 on both sides of the disk rotor 2. A pair of friction pads 4 and 4 arranged opposite to each other
And have

In the caliper body 3, cylinder holes 5, 5 opening toward the disk rotor 2 are provided opposite to the working portions 3 a, 3 b facing the both sides of the disk rotor 2, respectively. Piston 6 movably inserted
Is pressed by the hydraulic fluid supplied to the hydraulic chamber 7 at the bottom of the cylinder hole, and the lining 4a of the friction pad 4 is brought into sliding contact with the side surface of the disk rotor 2 to perform a braking action. Acting portions 3a, 3
b, a caliper half 3d divided into two along the thickness center line of the disk rotor 2 from the center of the bridge 3c connecting
3e is integrally connected by two connecting bolts 8,8.

The caliper half 3d has bracket portions 3f and 3g for mounting the vehicle body, and a union hole 3h for introducing the hydraulic fluid pressurized by a separate hydraulic master cylinder (not shown) into the hydraulic chambers 7 and 7. And a bleeder screw 9 for discharging air mixed in the working fluid to the outside.

At the center of the bridge portion 3c, a rectangular ceiling opening 10 is formed with a size that allows the friction pads 4 and 4 to be inserted into both sides of the disk rotor 2, and the bridge portion 3c has a disk opening. On the side, the notch steps 3i, 3i
Are provided with the ceiling opening 10 interposed therebetween. Torque receiving portions 3j and 3k are respectively provided on both sides of the front surface of each cylinder hole 7 covered by the bridge portion 3c so as to be continuous with the disk inlet side surface 10a and the disk outlet side surface 10b of the ceiling opening 10. .

Each friction pad 4 is provided with a lining 4a for slidingly contacting the side surface of the disk rotor 2, and a back plate 4 held on the caliper body 3 through one hanger pin 11.
b. The main body 4c of the back plate 4b to which the lining 4a is joined is formed to be slightly narrower than the space between the torque receiving portions 3j and 3k, and has a horizontally elongated pin hole 4d in the center of the outer surface in the disk radial direction. Suspensions 4e are extended, and shoulders 4f, 4
f is projected.

The friction pad 4 inserted from the ceiling opening 10 has a main body 4c of the back plate 4b, and the torque receiving portions 3j, 3
k, the ridges 3m, 3n of the working portions 3a, 3b are accommodated in the ceiling opening 10 from the position k.
A hanger pin 11 erected in the disk axis direction is inserted into the pin hole 4d of the suspension part 4e to be hung movably in the disk axis direction, and the back plate 4b and the bridge part 3c are hung.
The pad spring 12 is engaged with the hanger pin 11.

The pad spring 12 has a base 12a formed by bending a narrow strip having a thickness substantially equal to the thickness of the disk rotor 2 into a mountain shape, and a peak portion of the base piece 12a is concaved in an arc shape. The formed first contact portion 12b and the base piece 12a
A first spring portion 12c extending from one end to both sides, a connecting portion 12d extending from the other end of the base piece 12a to both sides, and one side surface of the connecting portion 12d in the direction of the first spring portion 12c across the base piece 12a. A pair of cover portions 12e, 12e bulging in parallel with the base piece 12a, and connecting portions 1 from opposite ends of the other side surface of the connecting portion 12d in a direction opposite to the first spring portion 12c.
It has a pair of second contact portions 12f, 12f that protrude while being opened outward from 2d.

The length from the first spring portion 12c of the pad spring 12 to the tip of the second contact portions 12f, 12f is shorter than the length of the ceiling opening 10 in the disk circumferential direction, and the first spring is perpendicular to the ceiling opening. The length of each of the portion 12c and the connecting portion 12d and the distance between the outer ends of the cover portions 12e and 12e are the same length, which is slightly shorter than the length of the ceiling opening 10 in the disk axis direction. 12f, 12
Other portions except f are sized to be accommodated in the ceiling opening 10.

The cover portions 12e, 12e are connected to the first contact portion 1
On both sides of 2b, it is formed in the shape which wraps the upper half of the hanging part 4e in the direction opposite to the depression of the first contact part 12b,
The straight portion on the tip side that is inclined in the direction of the base piece 12a is
The spring parts are 12g and 12g.

In the pad spring 12 configured as described above, the first contact portion 12b is provided on the lower surface of the hanger pin 11 outside the disk rotor 2, and the second contact portions 12f, 1
2f are respectively brought into contact with the notched step portions 3i, 3i of the bridge portion 3c, and the first spring portion 12c is connected to the back plates 4b, 4b.
Elastically contact the shoulders 4f, 4f on the disk reciprocating side, and suspend the suspension portions 4e, 4e of the friction pads 4, 4 with the cover portions 12e, 12e.
4e, and the second spring portions 12g, 12g are attached to the suspension portions 4e, 4e by elastically contacting the disk revolving side surfaces of the suspension portions 4e.

The first spring portion 12c and the second contact portion 12
f, 12f, a reaction force acts from the first contact portion 12b,
The first spring portion 12c is provided with a resilient force for urging the disc reciprocating sides of the friction pads 4 and 4 inward in the disc radial direction, and at the same time, the second contact portions 12f and 12f are used as fulcrums in FIG. When a clockwise moment acts, an elastic force acts on the friction pads 4 and 4 to urge the disk entry side of the friction pads 4 and 4 in the disk ejection direction. Also, the second spring portions 12g, 12g which are in elastic contact with the disk entry side surfaces of the suspension portions 4e, 4e, exert an elastic force for urging the suspension portions 4e, 4e in the disk unwinding direction, and the hanger pins 11 are provided. The non-operating friction pads 4, 4 suspended on the first and second spring portions 12
Due to the resilient forces c, 12g, and 12g, the disk is urged inward in the radial direction of the disk and in the direction in which the disk is ejected, and the disk ejection side of the back plate 4b is supported by the torque receiving portion 3k on the disk ejection side.

First and second spring portions 12c, 12
g and 12g of the elastic force in the disc ejecting direction
The second spring portion 12g resiliently hangs the suspension portion 4e in the ceiling opening, which is the outer portion of the friction pad 4 in the disk radial direction, toward the hanger pin 11, and supports the shoulder 4f on the disk re-entrant side. The first and second spring portions 12c cause the body portion 4c, which is an inner portion of the friction pad 4 in the radial direction of the disk, to repel in the disk ejecting direction by a moment about the second contact portions 12f, 12f as a fulcrum. , 12g, and 12g act in a balanced manner on the entire friction pad 4 so that the disk feeding side of the main body portions 4c, 4c of the back plates 4b, 4b receives torque on the disk feeding side. The surface 4k and the shoulder 4f on the disk outlet side are in elastic contact with the disk outlet side surface 10b of the ceiling opening 10 as parallel as possible.

In this embodiment, although the friction pads 4, 4 are hung from the caliper body 3 by one hanger pin 11, the disk feeding side surface of the main body 4c of each back plate 4b is previously determined. Are supported on the torque receiving surface 3k on the disk outlet side and the shoulder 4f on the disk outlet side are supported on the disk outlet side surface 10b of the ceiling opening 10, respectively. Is no longer generated. Also,
The first and second spring portions 12c, 12g, 12g
Since the main body 4c and the shoulder 4f of the back plate 4b are brought into elastic contact with the torque receiving surface 3k and the disk outlet side surface 10b of the ceiling opening 10 as parallel as possible, a predetermined braking torque can be obtained from the beginning of braking. The friction pad 4 supported on the disk feeding side of the back plate 4b in this manner also has the first spring portion 12
Since the disk reciprocating side is repelled toward the inside in the disk radial direction by c, rattling in the disk radial direction due to running vibration of the vehicle is effectively suppressed.

Further, the cover 1 of the pad spring 12
2e and 12e cover the suspension portions 4e of the friction pads 4 and 4, so that water and earth and sand do not adhere to the surface of the hanger pin 11 or enter the pin holes 4d, and the friction pads 4 and 4 slide. Good property can be ensured. In addition, the second spring portions 12g, 12g
Since it is formed by using a part of e and 12e, it is excellent in material removal, workability and economy.

FIGS. 5 to 8 show a second embodiment of the present invention. In the second embodiment, a third spring portion 12h is added to the pad spring 12 of the first embodiment. Except for this, the configuration is the same as that of the first embodiment. The third spring portion 12h of the pad spring 12 is
2d, it is formed in a substantially triangular shape protruding in the opposite direction to the first spring portion 12c while extending between the second contact portions 12f, 12f from the center of the other side surface. The portions 12e, 12e are bent back in an arc shape from the direction opposite to the bulge.

The other parts of the pad spring 12 except for the third spring part 12h are brought into contact or elastic contact with the friction pad 4, the bridge part 3c and the hanger pin 11 in the same manner as in the first embodiment. , 4 are urged similarly to the first embodiment. The third spring portion 12h
The front end of the main body 4c of the back plate 4b, the outer surface of the main body 4c of the back plate 4c in the disk radial direction, and the shoulders 4f, 4 on the disk outlet side.
f, the elastic force compressed between the first contact portion 12b and the shoulder 4f is applied between the inner side in the radial direction of the disk and the direction in which the disk is ejected. Acts in an oblique direction.

The elastic force of the third spring portion 12h acts on the friction pads 4 and 4 as a component force between the radial direction of the disk and the direction in which the disk is ejected. In the direction and the direction in which the disc is ejected.

In this embodiment, the third spring of the pad spring 12 is used.
Since the spring portion 12h urges the disc rewinding side of the friction pads 4 and 4 in the disc radial direction and the disc rewinding direction, the first and second acting on the disc retraction side of the friction pads 4 and 4 are provided. It antagonizes the resilience of the spring portion to further suppress the backlash in the disk radial direction due to the running vibration of the vehicle,
Since the disk receiving side 3k and the disk opening side surface 10b of the ceiling opening 10 are elastically contacted more in parallel with each other,
A predetermined braking torque can be obtained more stably from the beginning of braking.

In the pad springs of the first and second embodiments, the cover portion is raised from the disk exit side of the hanger pin, but may be provided on the disk entrance side of the hanger pin. The second spring portion may be formed separately. The present invention can be applied to a pin slide type caliper body in addition to the piston facing type shown in the embodiment.

[0028]

According to the vehicle disc brake of the present invention, a first contact portion which comes into contact with the pad spring on the inner side of the hanger pin in the radial direction of the disc and the disc reciprocating side of the friction pad resiliently project radially inward of the disc. A first spring portion, a second contact portion that engages with the caliper body on the disc outlet side relative to the hanger pin to apply a biasing force to the first spring portion in the disc outlet direction, and a suspension portion. The disk loading side of the disk is ejected in the disk discharging direction, and the first
Since the second spring portion that presses the disc feeding side surface of the friction pad against the torque receiving portion on the disc feeding side is provided together with the spring portion, even when the friction pad is suspended from the caliper body by one hanger pin. Regardless, since the disk feeding side surface of the friction pad is previously supported on the disk receiving side torque receiving surface by the resilient force of the first and second spring portions, the delay in initial braking and the unpleasant abutment are provided. Since no sound is generated and the resilient force of the first and second spring portions makes the disc feeding side of the friction pad elastically contact the torque receiving portion on the disc feeding side as much as possible, a predetermined amount is set from the beginning of braking. A braking torque can be obtained. In addition, the first spring portion 12c which resiliently moves the disk reciprocating side of the friction pad inward in the disk radial direction effectively suppresses rattling in the disk radial direction due to running vibration of the vehicle.

Further, when the above-mentioned pad spring is provided with a third spring portion which resiliently pushes the frictional pad toward the disk radially outward in the disk radial direction and toward the disk radially outward direction,
It antagonizes the resilience of the first and second spring portions acting on the disc reciprocating side of the friction pad, and further suppresses backlash in the disc radial direction due to the running vibration of the vehicle. Is more resiliently contacted to the disc receiving side torque receiving surface, so that a predetermined braking torque can be more stably obtained from the beginning of braking.

In addition, if the above-mentioned pad spring is provided with a cover portion for covering the suspension portion of the friction pad, water and earth and sand will not adhere to the surface of the hanger pin or enter the pin hole of the suspension portion. Therefore, it is possible to ensure good sliding properties of the friction pad.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view of a disc brake showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of a disc brake showing a first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1, showing a first embodiment of the present invention;

FIG. 4 is a perspective view of a pad spring showing a first embodiment of the present invention.

FIG. 5 is a partial cross-sectional front view of a disc brake showing a second embodiment of the present invention.

FIG. 6 is a partial cross-sectional plan view of a disc brake showing a third embodiment of the present invention.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 5, showing a second embodiment of the present invention;

FIG. 8 is a perspective view of a pad spring showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc brake for vehicles 2 ... Disc rotor 3 ... Caliper body 3a, 3b ... Working part 3c ... Bridge part 3d, 3e ... Caliper half 3i ... Notch stepped part 3j ... Torque receiving part on disk reciprocating side 3k ... Disc receiving side torque receiving portion 4: friction pad 4a: lining 4b: back plate 4c: body portion of back plate 4b 4d: pin hole 4e: suspension portion 4f: shoulder portion 10: ceiling opening 10a: ceiling opening 10 Disk entry side surface 10b ... Disc exit side surface of ceiling opening 10 11 ... Hanger pin 12 ... Pad spring 12a ... Base piece 12b ... First contact portion 12c ... First spring portion 12d ... Connecting portion 12e ... Cover portion 12f ... second contact part 12g ... second spring part 12h ... third spring part A ... rotation direction of disk rotor 2

Claims (3)

[Claims] A ceiling opening is provided in a bridge portion of a caliper body straddling the outer periphery of a disk rotor, and a disk radius of a pair of friction pads disposed between the torque receiving portions on both sides of the disk rotor through the ceiling opening. A suspension portion is provided at the center of the outer surface in the direction, and a single hanger pin erected in the axial direction of the disc across the disc rotor on the caliper body is inserted through the suspension portion to remove the friction pad from the disc. A vehicular disc brake in which a pad spring is contracted between the friction pad and the hanger pin while being movably suspended in the axial direction, wherein the pad spring abuts on the pad spring inward of the hanger pin in the disk radial direction. A contact portion, a first spring portion for resiliently pushing the disk reciprocating side of the friction pad radially inward of the disk, A second abutting portion that engages with the caliper body on the disc outlet side relative to the anchor pin and applies a biasing force to the first spring portion in the disc outlet direction;
A second spring portion is provided for resiliently ejecting the disk revolving side surface of the suspension portion in the disk unwinding direction, and pressing the disk revolving side surface of the friction pad against the disk receiving side torque receiving portion together with the first spring portion. Disc brakes for vehicles. 2. The vehicle according to claim 1, wherein the pad spring is provided with a third spring portion which resiliently pushes a disk outlet side of the friction pad in a disk radial direction and a disk outlet direction. For disc brakes. 3. The disc brake for a vehicle according to claim 1, wherein the pad spring is provided with a cover portion that covers a suspension portion of the friction pad.