JPH1182569A - Disc brake for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress behavior of a callipers body caused by a trailing torque as much as practicable and preclude a friction pad from trailing, uneven wear, and squeaking by equipping a bridge part with a good rigidity without reinforcing it with a strength member or forming with a large wall thickness, securing a requisite lining area to the friction pad, and embodying the callipers body light in the weight and compactly. SOLUTION: A rear plate 25 of a friction pad 4 is fitted with a hang-down piece 25a extending to the disc turn-in side of a bridge part 3c and a projection 25c to protrude to the disc turn-out side. A pad supporting recess 3j in the form of a semi-circular arc is furnished in the torque receptacle 3h of the callipers body 3. A hanger pin 26 is set over between pad supporting arms 3f and 3g, and the hang-down piece 25a is hung by the hanger pin 26, and the projection 25c is fitted into the recess 3j so as to support the friction pad 4.

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 various traveling vehicles such as automobiles and motorcycles, and more particularly, to a disc brake for a vehicle having a piston-facing caliper body.

[0002]

2. Description of the Related Art As a conventional vehicle disk brake,
For example, JP-A-8-166030 and Japanese Utility Model Laid-Open No. 5-10
No. 831 discloses a disk brake in which a piston is housed in a cylinder hole of an action portion opposed to both sides of a disk rotor, and a pair of friction pads is pushed by the piston to move the disk rotor. A caliper body of a piston-facing type that presses against both side surfaces is used.

[0003] Further, in this type of caliper body, since the distance between the acting portions is restricted to be narrow, the caliper body is divided into a pair of caliper halves from the center of a bridge portion which straddles the outside of the disk rotor, and is formed by casting. The cutting process of the cylinder hole and seal groove, etc., and the insertion and removal of the piston and the installation of seals can be performed easily, respectively, and both caliper halves, after installing the piston and seals,
A plurality of connection bolts are screwed into the bridge portion and connected integrally.

The bridge portion of the caliper body is provided with a rectangular pad attaching / detaching hole penetrating inside and outside, and the above-mentioned friction pad can be inserted and removed through the pad attaching / detaching hole. In one of the caliper halves,
A bracket for mounting the vehicle body is integrally formed, and the caliper body is fixed to the vehicle body by using the bracket for mounting the bracket.

[0005]

In such a configuration, in order to form a pad attaching / detaching hole, a thick portion at a central portion of a bridge portion has a large area surrounding a pair of friction pads on both sides of a disk rotor. Since the bridge portion is pulled out and the rigidity of the bridge portion against the braking reaction force is reduced, it is necessary to hang a strength member over the pad attaching / detaching hole or to make the entire bridge portion thick and reinforced. For this reason, when a strength member is used, the number of man-hours for manufacturing and assembling parts increases, which increases costs.In addition, the strength member must be attached and detached every time a friction pad is inserted or removed for maintenance or replacement. If the entire part is made thick, the caliper body becomes large and heavy, and there is a problem that the layout of the caliper body is restricted and the unsprung weight increases.

Further, since the connecting bolts for connecting the caliper halves are arranged on the disc reciprocating side and the retrieving side of the bridge portion avoiding the pad attaching / detaching holes, when the required lining area is secured on the friction pad, the caliper is reduced. The body becomes longer in the circumferential direction of the disk, and the weight also increases.

Also, the drag torque generated by the sliding contact between the disk rotor and the friction pad acts as a bending moment on the caliper body. In the caliper body, the disk inflow side of one caliper half approaches the disk rotor side. Behavior of the friction pad,
If the caliper body becomes longer in the circumferential direction of the disk, which causes squealing or the like, these problems become more serious.

[0008] Therefore, the present invention is to reduce the weight of the caliper body while securing the rigidity of the bridge portion without reinforcing with a strength member or forming the bridge portion to be thick, and securing the required lining area for the friction pad. Another object of the present invention is to provide a disk brake for a vehicle that is formed compact and that can minimize the behavior of the caliper body due to drag torque.

[0009]

According to the first aspect of the present invention, a caliper body is provided with a pair of working portions disposed on both sides of a disk rotor so as to oppose cylinder holes. A piston opposing type in which a pair of friction pads are pressed against both side surfaces of the disk rotor by pushing of the accommodated piston, and a bridge portion connecting the pair of working portions across the outer periphery of the disk rotor is provided with a bridge portion of the disk rotor. The caliper body is cut into a pair of caliper halves by cutting along a plane parallel to the rotation direction, and the pair of caliper halves are integrally connected by a plurality of connection bolts screwed to the bridge portion. A disc brake for a vehicle having a torque receiving portion for supporting a drag torque of a friction pad on a disc outlet side of a caliper body; The output side is supported by the concave and convex fitting with the torque receiving portion, and a suspension piece extending to the disk retraction side of the bridge portion is provided on the disk retraction side of the friction pad. It is characterized in that it is hung by a hanger pin which is hung over a pair of working portions on the disk revolving side.

In the second invention, the caliper body is
Cylinder holes are provided opposite to a pair of action portions disposed on both sides of the disk rotor, and a pair of friction pads are pressed against both side surfaces of the disk rotor by pushing of a piston accommodated in the cylinder holes. A piston facing type, in which a bridge portion connecting the pair of working portions across the outer periphery of the disk rotor is cut along a plane parallel to the rotation direction of the disk rotor, and the caliper body is divided into a pair of caliper halves. A torque receiving portion that integrally connects the pair of caliper halves with a plurality of connecting bolts screwed to the bridge portion and that supports a drag torque of a friction pad on a disc outlet side of the caliper body. In a disc brake for a vehicle, which is provided with a bracket for mounting the vehicle body integrally on the disc outlet side of one of the caliper halves,
A disk rewinding side of the friction pad is supported by uneven fitting with the torque receiving portion, and a suspension piece extending to the disk retraction side of the bridge portion is provided on the disk retraction side of the friction pad, The hanging piece is hung by a hanger pin wrapped around the disc reciprocating side of the pair of working portions, and a connecting bolt disposed on the disc revolving side is connected to the torque receiving portion and the friction pad. It is characterized in that it is arranged closer to the disk entry side than the contact surface.

According to the first or second aspect of the present invention, the disc reciprocating side of the friction pad is extended to the disc reciprocating side of the bridge portion, so that the caliper body is not enlarged.
The lining area of the friction pad can be increased. In addition, since the disc inflow side of the caliper body is opened from such a mounting structure of the friction pad, the friction pad can be inserted and removed on the disc inflow side of the caliper body. A pad attaching / detaching hole becomes unnecessary. Furthermore, the rigidity of the bridge portion is increased because the meat portion of the bridge portion is not extracted.

Further, according to the second aspect of the present invention, the body mounting bracket on the disk outlet side approaches the caliper body by the amount that the connecting bolt on the disk outlet side is moved toward the center of the caliper body. It is compact and lightweight with a reduced length in the disk circumferential direction.
Furthermore, the tightening torque of the body mounting bolts and the connecting bolts on the disc outlet side close to the center side of the caliper body,
Both act as a rigid force on the caliper body, and together with the compactness of the caliper body, the behavior of the caliper body due to the drag torque can be effectively suppressed, and the friction pad drags, unevenly wears, squeals, etc. Can be prevented as much as possible.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a disc brake for a motorcycle will be described below with reference to the drawings. FIGS. 1 to 3 show a first embodiment of the present invention, in which a disc brake 1 is fixed to a vehicle body at one side of the disc rotor 2 rotating in the direction of arrow A. Caliper body 3 and caliper body 3
And a pair of friction pads 4, 4 opposed to each other with the disk rotor 2 interposed therebetween.

The caliper body 3 is provided with four cylinder holes 5 that open to the disk rotor side in a pair of action portions 3a and 3b disposed on both sides of the disk rotor 2, and each of the cylinder holes 5 A four-pot piston-opposing type in which a piston 7 is movably inserted through a square seal 6 so as to be liquid-tight and movable, and a hydraulic chamber 8 is defined between the piston 7 and the bottom of the cylinder hole 5; Further, the center of a bridge portion 3c connecting the action portions 3a and 3b across the outer periphery of the disk rotor 2 is cut along a plane parallel to the rotation direction of the disk rotor 2 and divided into a pair of caliper halves 3d and 3e. Three connecting bolts 10, 11, 12 are screwed to the portion 3c in the disk axis direction, and the caliper halves 3d, 3e are integrally connected.

The caliper halves 3d and 3e have pad support arms 3f and 3g on the disk reciprocating side of the bridge portion 3c, and torque receiving portions 3h and 3h on the disk reciprocating side of the action portions 3a and 3b.
3h are provided to face each other, and one caliper half 3d is further provided with a bracket 3i for mounting the vehicle body.
And an input port 1 communicating with the hydraulic chamber 8 on the disk reciprocating side
3 and a blender hole 14 communicating with the hydraulic chamber 8 on the disc outlet side.

The pad support arms 3f and 3g project outward from the outer periphery of the disk rotor 2, and receive the torque receiving portions 3h and 3g.
h are disposed close to both side surfaces so as to sandwich the disk rotor 2. On the disk outlet side of the caliper body 3, both sides of the disk rotor 2 are torque receiving portions 3 h, 3 h.
On the other hand, the caliper body 3 having no torque receiving portion has the same wide interval as the radially inner side on the disk reciprocating side of the caliper body 3 without the torque receiving portion. 3b.

The pad support arms 3f and 3g have female screw holes 1
The pin 5 and the pin hole 16 are formed on the same axis, and each of the torque receiving portions 3h is provided with a semicircular pad supporting concave portion 3j which is open on the disk revolving side surface. A brewer screw 17 is screwed into the opening of the brewer hole 14 to block communication between the brewer hole 14 and the outside.

A bracket 3i for mounting the vehicle body is provided in parallel with the disk rotor 2 from the disk outlet side end of the action portion 3a, and the caliper body 3 is mounted on the bracket 3i.
Is overlapped with a caliper mounting portion (neither is shown) of a front fork or a swing arm, and a vehicle body mounting bolt (not shown) is screwed into two bolt holes 3k, 3k formed in the bracket 3i to be fixed to the vehicle body. Is established.

The bridge 3c is provided with three ridges 3m parallel to the disk axis and two small ceiling openings 18 alternately. Ridge 3m and ceiling opening 18
Is divided into two halves, 3d and 3e, and both halves 3d and 3e.
3e are integrally joined as described above, the divided surfaces are made to abut against the outside of the disk rotor 2 to form an integral shape, and the three ridges 3m are provided with the above-described connecting bolts 10-1.
The screw 2 is screwed in, the internal braking heat is discharged through the ceiling opening 18, and the degree of wear of the lining 24 of the friction pad 4 can be visually recognized.

The two adjacent hydraulic chambers 8, 8 of the caliper halves 3d, 3e communicate with each other through a liquid through hole 20, and the two hydraulic chambers 8, 8 facing each other on the disk outlet side are connected to each other. , And the above-described blender hole 14 communicates with the liquid through holes 21, 22, 23. The liquid through hole 21 is connected to the connecting bolt 1 on the disc outlet side.
2, a shaft hole, one end of which is opened at the tip of the connection bolt 12 and the other end is opened at both side surfaces of the large-diameter shaft portion of the connection bolt 12, and the liquid through hole 22 is a bolt of the connection bolt 13. The liquid hole 21 and the blender hole 14 communicate with each other through a liquid hole 22, and the liquid pressure chamber on the disk outlet side of the liquid hole 21 and the other caliper half 3 e. 8 is the liquid through hole 2
It communicates at 3.

The input port 13 is supplied with hydraulic fluid pressurized by a separate hydraulic master cylinder (not shown). The hydraulic fluid introduced into the input port 13 is the caliper half 3d
Is supplied to the hydraulic chamber 8 on the disk reciprocating side, and a part is further supplied to the other three hydraulic chambers 8 through the liquid through holes 20 to 23 and the bleeder hole 14. Each of the pistons 7 moves the respective cylinder hole 5 in the opening direction by the hydraulic fluid supplied to the hydraulic pressure chamber 8, and the lining 2 of the friction pads 4, 4 is moved.
4, 4 and 24 are brought into sliding contact with both side surfaces of the disk rotor 2 to perform a braking action.

Each friction pad 4 is composed of the above-mentioned lining 24 slidably in contact with the side surface of the disk rotor 2 and a metal back plate 25 held by the caliper body 3. On the disk reciprocating side of the back plate 25, a suspension piece 25a is provided so as to be inclined outward in the radial direction of the disk rotor 2.
The lining 24 is extended to the rising base of the suspension piece 25a, and a larger pad area is secured as a friction pad 4 used for the caliper body 3 having two pots per side.

A pin hole 25b is formed at the tip of the hanging piece 25a, and a semicircular projection 25c fitted on the pad support concave portion 3j of the torque receiving portion 3h is formed on the disk outlet side surface of the back plate 25. Is protruding. In the pin hole 25b, the distal end is inserted into the pin hole 16, and the proximal end is screwed into the female screw hole 15,
Hanger pin 2 hung over pad support arms 3f, 3g
6 is inserted, the friction pad 4 suspends the suspension piece 25a on the disc retraction side by the hanger pin 26, and the projection 25c on the disc retraction side into the pad support recess 3j.
It is supported by the concave and convex fitting.

The disc brake 1 of this embodiment is configured as described above. The friction pad 4 is slid in the disc feeding direction by the sliding contact between the disc rotor 2 and the lining 24. The torque receiving portion 3h provided on the disk feeding side is used to
With high rigidity. Also, the torque receiving portion is omitted on the disc reciprocating side of the caliper body 3,
Since the suspension piece 25a of the friction pad 4 is extended to the disk reciprocating side of the bridge portion 3c and is suspended by the hanger pin 26, the friction pads 4 and 4 are
Can be inserted and removed on the disk reciprocating side of the disk drive, and the bridge 3c is provided with small ceiling openings 18 so that the release of braking heat and the degree of wear of the lining 24 can be visually recognized. Rigidity enough to withstand the pressure can be secured, and the conventional large pad attaching / detaching hole is unnecessary. Also, the area of the lining 24 can be expanded to the base of the suspension piece 25a without increasing the size of the caliper body 3, and a large contact area with the disk rotor 2 can be ensured. , The thermal load on the disk rotor 2 and the caliper body 3 can be reduced, the durability can be improved, and the wear resistance of the friction pad 4 can be improved.

Further, as compared with the related art in which a strength member is bridged or the entire bridge portion is formed thick and reinforced.
The cost can be reduced by reducing the number of parts and the number of assembly steps, and the caliper body 3 can be formed lightweight and compact, so that the caliper body 3 can be freely laid out, and the unsprung load is reduced to make it more comfortable. Ride comfort can be ensured.

FIG. 4 shows a second embodiment of the present invention in which the caliper body 3 of the first embodiment is modified. This embodiment does not require a conventional pad attaching / detaching hole in the bridge portion 3c of the caliper body 3. Therefore, of the three connection bolts 10 to 12 connecting the caliper halves 3 d and 3 e, the connection bolt 12 on the disk outlet side is brought into contact with the torque receiving portion 3 h and the back plate 25 of the friction pad 4. It is different from the first embodiment in that it is located closer to the disk inlet than the surface 30.

As a result, the brackets 3i, 3i for mounting the vehicle body approach the torque receiving portion on the disc outlet side by the amount that the connecting bolt 12 on the disc outlet side is brought closer to the center of the caliper body. Of the caliper body 3 can be reduced, and the caliper body 3 can be made lighter and more compact.

In addition, the connecting bolt 12 on the disc outlet side
And the body mounting brackets 3i, 3i approach the center of the caliper body 3, and the tightening torque of the connecting bolt 12 and the vehicle body mounting bolt acts as a rigid force on the caliper body 3, so that the caliper body 3 is lightweight and compact. In combination with the friction pad, the behavior of the caliper body 3 due to the drag torque can be effectively suppressed.
Inconveniences such as dragging, uneven wear and squealing of No. 4 can be prevented as much as possible.

In both of the above embodiments, the bridge portion of the caliper body is provided with a small ceiling opening which allows the release of braking heat and the degree of wear of the lining to be visually recognized, but such a ceiling opening is omitted. Then, the rigidity of the bridge portion against the braking reaction force can be further increased.

Further, it is only necessary that the disc feeding side of the friction pad can be supported by the concave and convex fitting with the torque receiving portion, and the pad mounting concave portion and the projecting portion shown in the embodiment may be in the reverse relationship. The shape may be different from the example.

[0031]

As described above, according to the first or second aspect of the present invention, the friction pad can be inserted and removed at the disc reciprocating side of the caliper body, and the pad can be attached and detached conventionally provided at the bridge portion. Since no holes are required, it is possible to secure sufficient rigidity in the bridge portion to withstand the braking reaction without increasing the size of the caliper body. Furthermore, even if the caliper body remains the same size as before, the area of the lining is expanded to the hanging piece of the back plate,
Since a large contact area between the disk rotor and the lining can be secured, a large braking force can be imparted to the disk brake, and the thermal load on the disk rotor and caliper body can be reduced to improve durability. At the same time, the wear resistance of the friction pad can be improved.

Further, as compared with the conventional method in which the strength member is bridged over the pad mounting hole or the entire bridge portion is formed thick and reinforced, the number of parts and the number of assembly steps can be reduced, and the cost can be reduced. Since the caliper body can be formed lightweight and compact, the caliper body can be freely laid out, and the unsprung load can be reduced to ensure a comfortable ride.

According to the second aspect of the present invention, the bracket for mounting the vehicle body approaches the torque receiving portion on the disk outlet side by the amount that the connecting bolt on the disk outlet side is moved toward the center of the caliper body. The length of the caliper body in the circumferential direction of the disc is reduced, making the caliper body lighter and more compact. In addition, the tightening torque of the body mounting bolts and connecting bolts on the disc exit side provides rigidity to the caliper body. Therefore, the behavior of the caliper body due to the drag torque can be effectively suppressed, and problems such as drag, uneven wear, and squealing of the friction pad can be prevented as much as possible.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line II of FIG. 2 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 shows a first embodiment of the present invention, and FIG.
Sectional view

FIG. 4 is a sectional front view of a disc brake showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper body 3a, 3b ... Working part 3c ... Bridge part 3d, 3e ... Caliper half body 3f, 3g ... Pad support arm 3h ... Torque receiving part 3i ... Bracket for vehicle body attachment 3j ... Pad support recess 3k Bolt hole 3m Ridge part 4 Friction pad 5 Cylinder hole 7 Piston 8 Hydraulic chamber 10, 11, 12 Connection bolt 15 Female screw hole 16 Pin hole 18 Ceiling opening 20, 21, 22, 23 ... liquid through hole 24 ... lining 25 ... back plate 25a ... hanging piece 25b ... pin hole 25c ... protruding portion fitted to pad supporting concave portion 3j 26 ... hanger pin 30 ... torque receiving portion 3h Abutment surface of friction pad 4 with back plate 25 A: Rotation direction of disk rotor 2

Claims (2)

[Claims] A caliper body is provided with a pair of action portions disposed on both sides of a disk rotor, with cylinder holes opposed to each other.
A piston facing type that presses a pair of friction pads against both side surfaces of a disk rotor, and cuts a bridge portion connecting the pair of working portions across the outer periphery of the disk rotor along a plane parallel to the rotation direction of the disk rotor. The caliper body is divided into a pair of caliper halves, and the pair of caliper halves are integrally connected by a plurality of connection bolts screwed to the bridge portion. In a vehicle disc brake provided with a torque receiving portion for supporting a braking torque of a friction pad, a disc revolving side of the friction pad is supported by uneven fitting with the torque receiving portion, and a disc rotation of the friction pad is performed. A hanging piece is provided on the output side to extend to the disk loading side of the bridge portion, and the hanging piece is hung over the disk loading side of the pair of working portions. Vehicle disc brake, characterized in that the hanging at Pin. 2. A caliper body having a pair of working portions disposed on both sides of a disk rotor, having cylinder holes opposed to each other.
A piston facing type that presses a pair of friction pads against both side surfaces of a disk rotor, and cuts a bridge portion connecting the pair of working portions across the outer periphery of the disk rotor along a plane parallel to the rotation direction of the disk rotor. The caliper body is divided into a pair of caliper halves, and the pair of caliper halves are integrally connected by a plurality of connection bolts screwed to the bridge portion. A disc receiving portion for supporting a braking torque of a friction pad, and a disc brake for a vehicle body integrally provided with a bracket for attaching a vehicle body to a disc exit side of one of the caliper halves. The output side is supported by the concave / convex fitting with the torque receiving portion, and extends to the disk feeding side of the friction pad and to the disk feeding side of the bridge portion. A hanging piece is provided, and the hanging piece is hung by a hanger pin that is hanged over the disk feeding side of the pair of action portions, and the connecting bolt provided on the disk feeding side is tightened by the torque. A disc brake for a vehicle, wherein the disc brake is provided on a side where a disc is inserted from a contact surface between a receiving portion and a friction pad.