JPH09229110A - Vehicle disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a hanger pin and a pad spring with simple structure for easy mounting and demounting by providing a pair of locking pieces elastically contact with the spring locking parts at both the ends of the hanger pin for suspending friction pads. SOLUTION: A hanger pin 13 movably suspends friction pads 4, 4 in the axial direction of a disk. In addition, one end is penetrated through the pin hole 3i of a rib part 3h at the other end. The hanger pin 13 is suspended on a bridge part 3c with spring locking parts 13a, 13a projected outside the rib parts 3h, 3h. Locking arms 14d, 14d are projected and interposed along both the sides of the bridge part 3c in which its extreme end side is in parallel with a connecting piece 14c. Each locking piece 14f at the tip end elasticity touches the spring locking part 13a of the hanger pin 13 from inside a disk to mount a pad spring 14. Thus, the friction pads 4, 4, and a pad spring 14 are removed by inwardly deflecting the locking pieces 14f, 14f to the engaged locking parts 13a, 13a-free side disk to draw out the hanger pin 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a disc brake mounted on a traveling vehicle such as a tricycle, and more particularly, to a hanger pin for suspending a friction pad and a pad spring mounting structure for elastically holding the friction pad inward of the disc.

[0002]

2. Description of the Related Art Disc brakes for vehicles in which a hanger pin and a pad spring are combined in a caliper body are disclosed, for example, in Japanese Patent Publication No. 56-14900 and Japanese Patent Laid-Open No. 5-180250. According to these techniques, a bridge opening of a caliper body is provided with a ceiling opening through which a friction pad is inserted and withdrawn inwardly and outwardly, and a pair of friction pads disposed opposite to both side surfaces of a disk rotor through the ceiling opening are provided. The bridge is suspended by a hanger pin that is installed in the disc axial direction, and the friction pad is biased inward by the pad spring that is attached to the hanger pin. Also, there is no play and the friction pad does not float outside the disc when braking.

[0003]

However, when removing the friction pad through the ceiling opening of the bridge portion for replacement or maintenance, the former disc brake has an annular groove in the portion of the hanger pin located outside the disc rotor. Since the locking piece of the pad spring is formed and is engaged with the annular groove, the locking piece of the pad spring is bent and disengaged from the annular groove between the outer peripheral surface of the disc rotor and the hanger pin. However, in order to secure this space, the bridge part should be moved to the outside of the disk to enlarge the caliper body, or the caliper body itself should be replaced every time the friction pad is replaced or maintained. I had to remove it from the car body.

Further, in the latter disc brake, since the outer structure of the hanger pin screwed to the bridge portion of the caliper body is covered with a stopper to prevent the hanger pin from coming off, replacement and maintenance of the friction pad is required. It was a cumbersome task in which the hanger pin, stopper plug, and pad spring had to be attached and detached. In particular, the hanger pin and stopper plug must be attached and detached using a dedicated turning tool, and the bridge part of the caliper body, the hanger pin and stopper plug must be threaded, respectively, so workability, workability, and economic efficiency Was disadvantageous in each respect.
Further, in any of the disc brakes, the friction pad is arranged between the torque receiving portion projecting on the disc inflow side and the outflow side of the caliper body, but between the torque receiving portion and the friction pad. Since a slight gap is set, the friction pad when the vehicle is running moves in the disc circumferential direction and causes rattling noise, and the friction pad during braking moves in the disc turning direction due to sliding contact with the disc rotor. There has been a problem that the disk is dragged and hits the torque receiving portion on the disk delivery side to generate an abutting sound.

Therefore, according to the present invention, when the friction pad is replaced or maintained through the ceiling opening of the caliper body, the hanger pin and the pad spring can be easily attached / detached with a simple structure to improve workability and workability. The main purpose of the present invention is to provide a disc brake for a vehicle at a low cost, and at the same time, it is possible to effectively prevent rattling noise in the disc circumferential direction during traveling of the vehicle due to a friction pad and contact noise during braking.

[0006]

In order to achieve the above-mentioned main object, in the first invention, a ceiling opening portion for inserting and removing a friction pad is provided in a bridge portion of a caliper body which is arranged straddling the outer side of a disk rotor. A pair of friction pads provided so as to penetrate inside and outside and opposed to both side surfaces of the disk rotor with the ceiling opening sandwiched therebetween are suspended by hanger pins that are bridged in the disk axial direction on the bridge section, In a vehicle disc brake in which the friction pad is urged inwardly of the disc by a pad spring attached to the hanger pin, the hanger pin is formed to have a length protruding from both sides of the bridge portion. Spring engaging portions are provided at both ends of the pin, and the pad springs are provided on the outer and outer sides of the discs of the friction pads. A pair of pad pressing pieces that press the inside of the disk, a connecting piece that connects the intermediate portions of both pad pressing pieces, and that makes a elastic contact with the inside surface of the disk of the hanger pin through the hanger pin, and both sides of the connecting piece. It is characterized in that a pair of locking arms projecting from both sides of the bridge portion to both sides of the bridge portion and a pair of locking pieces elastically contacting the spring locking portions at both ends of the hanger pin at the tips of the respective locking arms are provided. .
As a second invention for achieving the above subordinate object,
The invention is characterized in that a pair of locking pieces of the present invention are connected to the disc turning-out side of the connecting piece.

According to the first aspect of the present invention, when the pair of friction pads are assembled to the caliper body, the friction pads are suspended from the hanger pins while the pad spring coupling piece is passed through the inner surface of the hanger pin disk. It is installed on the bridge part and both sides of the pad spring are locked to the spring locking parts at both ends of the hanger pin protruding from both sides of the bridge part, so that the hanger pin can be prevented from coming off and the pad spring can be attached at the same time. The friction pads are hung on both sides of the disc rotor so as to face each other.

The pad pressing piece of the pad spring receives a reaction force from a connecting piece elastically contacting the inner surface of the hanger pin disk or a locking arm elastically contacting the locking piece with the spring locking portion to generate a friction pad. It makes elastic contact with the outside and outside of the disc, and urges the friction pad toward the inside of the disc to prevent rattling in the disc radial direction when the vehicle is running, and to lift the disc outward when braking. Suppress. Since the hanger pin installed on the bridge part is prevented from coming off by engaging with the pad spring as described above, parts that are conventionally used to prevent coming off, such as stopper plugs, and screws to the bridge part and hanger pin are used. The processing and the turning tool for attaching and detaching the hanger pin and the retaining part are not required.

When the friction pad mounted as described above is removed from the caliper body for replacement or maintenance, the locking piece of the pad spring is bent in the direction opposite to the engagement with the spring locking portion of the hanger pin. By releasing the engagement between the locking piece and the spring locking portion, the hanger pin can be pulled out. At the same time when the hanger pin is pulled out, both the friction pad and the pad spring are removed.

Since the engagement and disengagement work of the locking piece for pulling out the hanger pin is performed on both sides of the bridge part from which the spring locking parts at both ends of the hanger pin project, a gap between the outer peripheral surface of the disk rotor and the hanger pin is formed. In addition, there is no need to set a space for engaging and disengaging. Further, since the hanger pin is formed in a symmetrical shape having the same shape of the spring engaging portion at both ends, it is not necessary to limit the inserting direction to the bridge portion and the extracting direction.

According to the second aspect of the present invention, the pair of locking pieces of the pad spring are connected to the connecting piece near the disc so that the spring pieces of the hanger pin are elastically contacted with each other. The force of the friction pad acts on the outer surface of the friction pad more than on the insertion side of the friction pad, so that the corners of the inner surface and the inner surface of the friction pad come into contact with the torque receiving portion on the insertion side of the disc. Further, the corner portions of the disc feeding side surface and the outer side surface are in contact with the torque receiving portion on the disc feeding side. In this way, the friction pad is preliminarily inclined between the torque receiving portion on the disc entry side and the delivery side and is suspended in a state in which the gap between the torque receiving portion and the torque receiving portion is filled. There is no rattling in the disk circumferential direction due to running of the vehicle, and no contact noise is generated during braking.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The disc brake 1 includes a disc rotor 2 which rotates integrally with a wheel (not shown) in the direction of arrow A, a caliper body 3 of a piston facing type which is fixedly mounted on the vehicle body at one side of the disc rotor 2. A pair of friction pads 4, 4 arranged between the action parts 3a, 3b of the caliper body 3.
And have The caliper body 3 includes action parts 3a, 3
Each of b is composed of a pair of caliper halves integrally formed with half halves of a bridge portion 3c that is arranged to straddle the outer side of the disk rotor 2, and is connected with four connecting bolts 7. Pistons 9a, 9b are provided in four large and small cylinder holes 8a, 8b provided facing the operating portions 3a, 3b.
Are fluid-tightly inserted, and the hydraulic chambers 10 are respectively provided between the pistons 9a, 9b and the bottoms of the cylinder holes 8a, 8b.
Is defined.

On one working portion 3a on the vehicle body mounting side, brackets 3d, 3d for vehicle body mounting, a union hole 11 for introducing hydraulic fluid, and a bleeder screw 12 for discharging air mixed in the hydraulic fluid. And are provided. The hydraulic fluid pressurized by a hydraulic master cylinder (not shown) is introduced into the union hole 11 by the driver's braking operation, and the hydraulic fluid is branched into four hydraulic chambers 10,
The pistons 9 are pushed toward the openings of the cylinder holes 8a and 8b, the linings 5 of the friction pads 4 are pushed to both side surfaces of the disc rotor 2, and a braking action is performed.

Each friction pad 4 has a lining 5 as described above.
And a metal back plate 6 for holding the lining 5. The lining 5 and the main body portion 6a of the back plate 6 to which the lining 5 is attached are formed in a horizontal rectangle that is gently curved according to the curvature of the disc rotor 2, and the upper surface of the main body portion 6a of the back plate 6 is formed. A suspension piece 6b having a pin hole 6c is provided at the center of the projection, and spring receiving pieces 6d and 6d are provided on both sides so as to be smaller than the suspension piece 6b.

On the disk rotor side of the operating portions 3a and 3b, the torque receiving portion 3 is divided into an upper and a lower side into which the cylinder holes 8a and 8b are sandwiched and the disc inflow side and outflow side, respectively.
e and 3f are provided so as to project at a distance slightly wider than the lateral width of the main body portion 6a of the back plate 6, and the friction pad 4 accommodates the main body portion 6a of the back plate 6 between the torque receiving portions 3e and 3f. Then, it is suspended by the hanger pin 13 and is further urged inwardly of the disc by the elastic force of the pad spring 14 attached to the hanger pin 13.

A ceiling opening 3g is provided so as to penetrate inward and outward at a central portion of the bridge portion 3c, which is located outside the friction pads 4 and 4. The ceiling opening 3g is opposed to the ceiling opening 3g in the disc axial direction. Pin holes 3i, 3i for suspending hanger pins are formed through the ridges 3h, 3h at the center of the outer surface. The ceiling opening 3g is formed in a rectangular shape having a size surrounding the friction pads 4 and 4 on the front surface of the cylinder hole, and the friction pads 4 and 4 are inserted and removed through the ceiling opening 3g.

The hanger pin 13 has a bridge portion 3c.
A round bar having a length protruding from the ridges 3h, 3h is used, and a small-diameter annular groove is provided in the same shape on the protruding portions at both ends, and the annular groove is used as a spring locking portion 13a, 13a. Is formed in. Pad spring 14
Is a pair of parallel pad pressing pieces 14a, 14b, a connecting piece 14c connecting the middle portions of the pad pressing pieces 14a, 14b in a cross direction, and both sides of the connecting piece 14c which are biased to one pad pressing piece 14a side. It projects outward from the edge while being slightly inclined, and further in the direction of the other pad pressing piece 14b, the connecting piece 14
It is composed of a pair of locking arms 14d, 14d extending parallel to c. The pin engaging portion 14e is provided at the center of the connecting piece 14c.
Is recessed in an arc shape, and at the tip of each locking arm 14d,
Each of them has a circular arc-shaped locking piece 14f.

The hanger pin 13 has one end inserted into the pin hole 3i of the one ridge 3h, and the other end inserted from the ceiling opening 3g between the torque receiving portions 3e and 3f of the operating portions 3a and 3b. The friction pads 4 and 4 are inserted into the pin holes 6c and 6c, the friction pads 4 and 4 are movably suspended in the disc axial direction, and one end is inserted into the pin hole 3i of the other ridge 3h. The spring engaging portions 13a, 13a to the ridge portion 3
It is suspended on the bridge portion 3c in a state of being projected to the outside of h, 3h.

Further, the pad spring 14 has a pair of pad pressing pieces 14a and 14b straddling the outer side of the disk rotor 2 in the disk axial direction within the ceiling opening 3g, and one pad pressing piece 14a is connected to the friction pad 4a. , 4 on the disk receiving side spring receiving pieces 6d, 6d, and while connecting the other pad pressing piece 14b to the disk receiving side spring receiving pieces 6d, 6d of the friction pads 4, 4 as well. The piece 14c is passed inside the hanger pin 13, and the pin engaging portion 14e is elastically contacted with the inner surface of the disc of the hanger pin 13. The locking arms 14d, 14d are the connecting pieces 1
4c is arranged so as to project along both sides of the bridge portion 3c, and each locking piece 14f at the tip is elastically contacted with the spring locking portion 13a of the hanger pin 13 from the inside of the disc to mount the pad spring 14. It

The pad spring 1 thus mounted
The pad pressing pieces 14a and 14b of No. 4 have hanger pins 1
The reaction force from the pin engaging portion 14e of the connecting piece 14c elastically contacting the inner surface of the disk 3 and the engaging arm 14d elastically contacting the engaging piece 14f with the spring engaging portion 13a acts, and the friction pad 4, 4 is urged toward the inside of the disc to prevent rattling in the radial direction of the disc when the vehicle is running and floating outside the disc when braking. Further, since the locking arms 14d and 14d are connected to the disk turning-out side of the connecting piece 14c,
The reaction force from the locking arms 14d, 14d is the pad pressing piece 14
Through a, the friction pads 4 and 4 have a great effect on the disc feeding side.

As a result, in the friction pads 4 and 4, the corner portions of the disc-turning-in side surface and the inner side surface of the main body portion 6a of the back plate 6 come into contact with the torque receiving portion 3e on the disc-turning-in side in advance, and the disc-turning side. The corner portions of the projecting side surface and the outer side surface come into contact with the torque receiving portion 3f on the disc payout side (see FIG. 3). As described above, each friction pad 4 is previously provided with the torque receiving portions 3e and 3f.
Since it is suspended in a state in which the gap between and is tilted in the same direction as the behavior during braking,
In addition to preventing rattling in the radial direction of the disc, rattling in the circumferential direction of the disc can also be prevented. Further, contact noise due to dragging of the disc rotor 2 is prevented during braking, and the friction pad 4 during braking is also prevented. , 4 do not float outside the disc due to the sliding contact with the disc rotor 2, so that the braking torque set in the disc brake 1 can be effectively exerted.

When the friction pads 4 and 4 mounted as described above are removed from the caliper body 3 for replacement or maintenance, the locking pieces 14 of the pad spring 14 are used.
The f and 14f are bent toward the inside of the disk in the direction opposite to the engagement with the spring locking portions 13a and 13a, and the locking piece 14
By releasing the engagement between f and 14f and the spring locking portions 13a and 13a, the hanger pin 13 can be pulled out. At the same time when the hanger pin 13 is pulled out, both the friction pads 4 and 4 and the pad spring 14 are pulled out. Is removed.

The engaging and disengaging work of the locking pieces 14f, 14f for pulling out the hanger pin 13 is performed on both sides of the bridge portion 3c from which the spring locking portions 13a, 13a at both ends of the hanger pin project. It is not necessary to set a space for engagement and disengagement between the outer peripheral surface of 2 and the hanger pin 13. Also, the hanger pin 13
Since the spring locking portions 13a and 13a having the same shape are formed at both ends, the spring locking portions 13a and 13a are formed in a symmetrical shape, the insertion direction and the extraction direction to the bridge portion 3c are not limited, and the assembling work can be easily performed.

Further, in the present embodiment, as is clear from FIG. 6 which shows dynamically the erected state of the hanger pin 13, the pad spring 1 is provided at three points on the center and both ends of the hanger pin 13.
A load for pushing the disk outward from the pin engaging portion 14e and the locking pieces 14f, 14f of No. 4 acts, and the bridge portion 3c is provided at two points between the center and both ends of the hanger pin 13.
The load in the opposite direction, which pushes inward from the ridges 3h, 3h, acts on the hanger pin 13, and the load in the opposite direction is alternately distributed in a well-balanced manner to be canceled out. Is small, the hanger pin 13 can be downsized, and a lightweight material such as synthetic resin can be used, and the overall weight of the disc brake can be reduced.

The present invention can contribute to weight reduction by locking the pad spring locking piece to the spring locking portion of the hanger pin from the inside of the disk as in the embodiment, but the locking piece is a disk. Even if it is locked from the outside, there is no difference in the function of suspending the friction pad. Also, omitting the pin engagement portion of the pad spring shown in the form example,
The connecting piece may be directly elastically contacted with the inner surface of the disc of the hanger pin. Further, the spring engaging portions on both ends of the hanger pin may be chamfered or partially cut out, in addition to the annular groove of the embodiment. Further, the hanger pin may penetrate the ceiling opening and be installed on the bridge portion. Further, the spring receiving piece of the friction pad shown in the embodiment is omitted, and the pad pressing piece of the pad spring is replaced with the disc of the back plate. You can also make direct elastic contact with the outer surface.

[0027]

As described above, according to the present invention, the hanger pins erected on the bridge portion of the caliper body are formed to have the lengths projecting from both sides of the bridge portion, and the spring engaging members are provided at both ends of the hanger pin. The stopper is recessed, and the pad spring that is engaged with the hanger pin presses the disc inward and outward sides of the disc outer surfaces of both friction pads straddling the outer side of the disc rotor inwardly of the disc. A pair of pad pressing pieces, a connecting piece that connects the intermediate portions of both pad pressing pieces, and that elastically contacts the disk inner surface of the hanger pin through the hanger pin, and the bridge portion from both side edges of the connecting piece. Replace the friction pads by providing a pair of locking arms that project to both sides and a pair of locking pieces that make elastic contact with the spring locking portions on both ends of the hanger pin at the tips of each locking arm. When removed from the caliper body in maintenance, while attaching the caliper body to the vehicle body, by a locking piece of the pad spring only deflect in the opposite direction to the engagement between the spring engagement portion of the hanger pin,
The friction pad can be easily removed together with the hanger pin and pad spring.

Therefore, it is possible to eliminate the need for a dedicated stopper component such as a stopper, which is conventionally used for retaining the hanger pin, so that the number of components can be reduced, and the rotation for attaching and detaching the hanger pin and the retainer component can be achieved. Since no tools are required, it has excellent workability in attachment and detachment, and since it does not require threading on the bridge part, hanger pins, etc., it has excellent workability and can be formed at a low cost. .

Further, since the engaging and disengaging work of the locking piece for pulling out the hanger pin is performed on both sides of the bridge part where the spring locking parts at both ends of the hanger pin project, the outer peripheral surface of the disc rotor and the hanger pin are Between,
Since it is not necessary to set a space for engaging and disengaging the pad spring, the disc brake as a whole can be made compact. Further, since the hanger pin is formed in a symmetrical shape having the same shape of spring locking portion at both ends, it is not necessary to limit the inserting direction to the bridge portion and the extracting direction, and the attaching / detaching work can be performed more easily. .

Further, by connecting a pair of locking pieces of the pad spring to the disc turning side of the connecting piece,
The reaction force from the locking arm largely acts on the disc outflow side of the friction pad through the pad pressing piece, and the friction pad moves in the same direction as the behavior during braking with the gap between the torque receiving parts filled in advance. Since it is suspended in an inclined state, when the vehicle is traveling, rattling of the friction pad in the radial direction of the disc and the circumferential direction of the disc is prevented, and during braking, the friction pad is dragged by the disc rotor to cause contact noise. And the frictional pad during braking does not float outside the disc due to the sliding contact with the disc rotor, so that the braking torque set for the disc brake can be effectively exerted. .

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view of a disc brake showing an embodiment of the present invention.

FIG. 2 is a front view of a disc brake showing an example of the present invention.

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

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2 showing an embodiment of the present invention.

FIG. 5 is an exploded perspective view of a hanger pin and a pad spring showing an embodiment of the present invention.

FIG. 6 is a schematic view of a state in which a hanger pin showing one embodiment of the present invention is installed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper body 3a, 3b ... Action part 3c ... Bridge part 3e, 3f ... Torque receiving part 3g ... Ceiling opening 3h ... Ridge part 3i ... Pin hole for hanging a hanger pin 4 ... Friction pad 5 ... Lining 6 ... Back plate 6a ... Body part of back plate 6b ... Suspension piece of back plate 6c ... Pin hole of suspension piece 6b ... Spring receiving piece 8a, 8b of back plate 6 ... Cylinder Holes 9a, 9b ... Piston 10 ... Hydraulic chamber 13 ... Hanger pin 13a ... Spring locking portion 14 ... Pad spring 14a, 14b ... Pad pressing piece 14c ... Linking piece 14d ... Locking arm 14e ... Pin engaging portion 14f ... Engagement Stopper A ... Rotation direction of disk rotor 2

Claims (2)

[Claims] 1. A bridge portion of a caliper body which is arranged so as to straddle the outside of a disk rotor, is provided with a ceiling opening portion for inserting and removing a friction pad, which penetrates inward and outward, and sandwiches the ceiling opening portion of the disk rotor. A pair of friction pads, which are arranged opposite to each other on both sides, are suspended by a hanger pin erected in the disc axial direction on the bridge portion, and the friction pads are inwardly disposed by a pad spring attached to the hanger pin. In the vehicle disc brake biased to, the hanger pin is formed to have a length protruding from both sides of the bridge portion, and spring locking portions are provided at both ends of the hanger pin, respectively, and the pad spring is attached to the pad spring. A pair of pad pressing pieces for pressing the disk inward and outward sides of the outer surfaces of the friction pads of both the disks inwardly of the disk, and both pad pressing pieces A connecting piece that connects the intermediate parts of the two and elastically contacts the inner surface of the disk of the hanger pin by passing through the hanger pin, and a pair of locking arms that project from both side edges of the connecting piece to both sides of the bridge part. A disc brake for a vehicle, comprising a pair of locking pieces elastically contacting the spring locking portions at both ends of the hanger pin at the tip of the locking arm. 2. The disc brake for a vehicle according to claim 1, wherein the pair of locking pieces are connected to a disc turning-out side of the connecting piece.