JP3729613B2 - Vehicle disc brake - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc brake used in a traveling vehicle such as an automobile or a motorcycle, and more specifically, a pad spring suppresses rattling of a friction pad suspended by using a pair of hanger pins on both sides of a disc rotor. It relates to the structure.
[0002]
[Prior art]
An example of a vehicle disc brake using a pad spring is disclosed in Japanese Patent Publication No. 1-59458.
In this technique, a pair of friction pads are disposed between the torque receiving portions on both sides of the disk rotor on the disk turning-in side and the turning-out side, and two receiving portions are provided on the outer side in the disk radial direction of each friction pad. A pad spring attached to the caliper body outside the friction pad in the radial direction of the disk abuts against one receiving part of the friction pad and presses at least the friction pad in the radial direction of the disk, and the other of the friction pad There is provided a pad pressing portion that is in contact with the receiving portion and presses at least the friction pad to one side in the circumferential direction of the disc with a larger force than the friction pad is pressed to the other side. It is designed not to rattle in the radial direction or the disk circumferential direction.
[0003]
[Problems to be solved by the invention]
However, in the above-described configuration in which the two pad pressing portions of the pad spring press the same side surface of the friction pad in different directions, an unbalanced biasing force acts on the friction pad, so that the friction pad tilts and the caliper body A non-uniform gap is generated between the torque receiving portion on the disk delivery side and the torque transmission surface on the disk delivery side of the friction pad.
[0004]
For this reason, the friction pad is dragged in the disk feeding direction at the start of the braking operation, the friction pad fills the gap between the torque receiving portion and the torque transmission surface, and the torque transmission surface is controlled until it comes into contact with the torque receiving portion. No power is generated, so-called initial braking is delayed, and rattling noise is generated due to running vibration, or the frictional pad torque transmission surface strikes the caliper body torque receiving part for braking action, and contact noise is generated There are things to do.
[0005]
SUMMARY OF THE INVENTION Accordingly, the present invention provides a disc brake for a vehicle that is capable of obtaining a predetermined braking torque from the initial stage of braking by effectively preventing the delay of initial braking without generating unpleasant rattling noise or contact noise. It is an object.
[0006]
[Means for Solving the Problems]
Means for achieving the above object are expressed as follows by adding the reference numerals in the drawings in parentheses . In this specification, the disk entry side and the delivery side are for when the vehicle moves forward. A pair of frictions arranged between the torque receiving part (3j) on the disk feeding side and the torque receiving part (3k) on the disk feeding side of the caliper body (3) on both sides of the disk rotor (2). The suspending portions (15a) extending respectively to the disk inlet side and the disk outlet side of the pads (4, 4) in the radial direction of the disk are connected to the caliper body (3) in parallel with the disk axis and the disk inlet side and A pair of hanger pins (13, 13) respectively installed on the disk delivery side are respectively inserted to suspend the pair of friction pads so as to be movable in the disk axial direction, and the friction pads (4, 4). The pad spring (16) includes a flat plate-like main body portion (16a) at the center and the main body portion (16). ) And four first arm portions (16b) that protrude from one side edge of each side edge, and one second arm portion (16c) that protrudes from the center of one side edge of the main body portion (16a). Similarly, one third arm portion (16d) protruding from the center of the other side edge of the main body portion (16a) is formed by bending a thin metal plate, and each first arm portion (16b) has a main body at its tip . part (16a) and with been chosen parallel plane portion, the flat portion first pad pressing portion (16e) ungated, second, third arm portion (16c, 16d) is first from the main body portion (16a) The narrow flat surface portion that protrudes at the same angle as the one arm portion (16b) and protrudes from the tip thereof is formed as a pin contact portion (16f), and the pin contact portion (16f) of the second arm portion (16c). ) Has a bullet portion (16g), and a pin abutting portion (16f) of the third arm portion (16d) has a second pad press. (16h) are provided in series, and the elastic portion (16g) has a strip having the same width as the pin abutting portion (16f) of the second arm portion (16c) on one side of the main body portion (16a). It is formed by bending back into a U-shape between two first pad pressing portions (16e, 16e) protruding from both ends of the edge, and the second pad pressing portion (16h) is the other side edge of the main body portion (16a). the first pad pressing portion of the other two protruding from both ends (16e, 16e) formed by bending into an L-shaped outward, the pad spring (16), pin those of the second arm portion (16c) contact portion (16 f), by preferably under the disc radially inside of the disk rotation exit side of the hanger pin (1 3), brought into contact engagement in the rotating-out disk side of the hanger pin (1 3) Rutotomoni, The pin contact portion (16f) of the third arm portion (16d) The hanger pin (13) is inserted into the inner side of the disk radial direction so as to abut and engage with the hanger pin (13) on the disk insertion side, and the four first pad pressing portions (16e) are brought into contact with the hanger pins (13e) by the respective reaction forces. disk rotation exit side of the four suspending member respectively in the disk radial direction outer (15a) was pressed, the resilient portion (16g) the disk rotation exit side of the hanger pin (13) of the friction pad (4,4) And the second pad pressing portion (16h) is pulled to the disc insertion side of the friction pad (4, 4) by the suspension portion (15a). ) Is pushed to the disk entry side, and the friction pads (4, 4) are urged in the orthogonal direction to the torque delivery part (3k) on the disk delivery side .
[0007]
With this configuration, the friction pads (4, 4) at the time of non-braking have the torque transmission surface on the disk delivery side in advance of the disk rotation of the caliper body by the second pad pressing portion (16h) of the pad spring (16) . Since the exit-side torque receiving portion (3k) is in contact with the surface without any gap, it is possible to effectively generate a predetermined braking torque from the beginning of braking without the occurrence of delay in initial braking, rattling or contact noise. it can.
[0008]
Further, in the case of a vehicle disc brake, if a high torque is applied to the friction pads (4 , 4) due to sudden braking or an increase in braking force, the disk brake side of the friction pads (4, 4) is moved to the outer side in the radial direction of the disc. Since the force and the component force inside the disk radial direction are generated on the disk delivery side, respectively, the friction pads (4, 4) may be tilted. Of these, the two first pad pressing portions (16e) on the disk feed-in side may have a larger urging force than the two first pad pressing portions (16e) on the disk feed-out side.
[0009]
In such a configuration, the two first pad pressing portions (16e ) on the disk insertion side try to lift the disk insertion side of the friction pads (4, 4) to the outside in the disk radial direction by the large urging force. This function effectively suppresses the movements that occur and keeps the contact between the torque receiving part on the disk delivery side and the torque transmission surface without any gaps even when sudden braking or braking force is increased. It is possible to improve durability by avoiding the generation of indentation due to local contact with the torque receiving portion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A vehicle disc brake 1 includes a disc rotor 2 that rotates integrally with a wheel (not shown) in the direction of arrow A when the vehicle moves forward , a caliper body 3 that is supported by a vehicle body at one side of the disc rotor 2, and a disc rotor 2. It has a pair of friction pads 4 and 4 that are arranged opposite to each other.
[0011]
The caliper body 3 is provided with four cylinder holes 5 that open to the disk rotor side surfaces 3f and 3f on the action portions 3a and 3b disposed on both sides of the disk rotor 2, and each cylinder hole 5 is angularly sealed. A cup-like piston 7 inserted in a fluid-tight and movable manner through 6 is pushed by the hydraulic fluid supplied to the hydraulic chamber 8 at the bottom of the cylinder hole, and the lining 14 of the friction pad 4 is moved to the disc rotor 2. A four-pot opposed type that slides against the side surface of the disc rotor 2 to perform a braking action, and extends from the central portion of the bridge portion 3c that connects the acting portions 3a and 3b across the outer side of the disc rotor 2 along the thickness center line of the disc rotor 2. The caliper halves 3d and 3e divided into two parts are integrally connected by four connecting bolts 9 that are long and short.
[0012]
On one caliper half 3d, the union hole 10 for introducing the hydraulic fluid pressurized by a separate hydraulic master cylinder (not shown) into the hydraulic chambers 8 and 8 and the mixed air in the hydraulic fluid are discharged to the outside. A bleeder screw 11 is provided.
[0013]
A rectangular ceiling opening 12 that is slightly longer in the circumferential direction of the disk is formed in the center of the bridge portion 3c so as to penetrate both friction pads 4 and 4 into both sides of the disk rotor 2. Protruding torque receiving portions 3j and 3k are provided in the radial direction of the disc on both sides of the disc inlet side and the outlet side of the disc rotor side surfaces 3f and 3f continuous inside the disc facing surfaces 12a and 12a of the opening 12, respectively. Is provided.
[0014]
Each friction pad 4 includes the above-described lining 14 that is in sliding contact with the side surface of the disk rotor 2 and a back plate 15 that is held by the caliper body 3 via a pair of hanger pins 13 and 13. Hanging portions 15a, 15a each having a horizontally long pin hole 15b are extended on both sides of the back plate 15 in the radial direction of the disk , that is, on the disk insertion side and the extraction side. The hanger pins 13 and 13 installed on the disk insertion side and the extraction side in the bridge portion 3c through the ceiling opening 12 in parallel to the disk axis are inserted into the respective pin holes 15b and 15b, and the disk axial direction The pad springs 16 are disposed so as to be movable to the outside of the friction pad 4, and are urged by a pad spring 16 disposed on the outer side in the disk radial direction of the friction pads 4, 4.
[0015]
The pad spring 16 includes a central flat plate-like main body portion 16a, four first arm portions 16b protruding from both ends of the main body portion 16a, and a second arm portion protruding from the center of one side edge of the main body portion 16a. 16c and a third arm portion 16d that protrudes from the center of the other side edge of the main body portion 16a are formed by bending a thin metal plate such as a stainless steel plate, and has a long rectangular shape that can be accommodated in the ceiling opening portion 12. ing.
[0016]
Each first arm portion 16b is inclined to one side from the main body portion 16a, and a flat portion parallel to the main body portion 16a connected to the tip thereof is formed as a first pad pressing portion 16e. The second and third arm portions 16c and 16d protrude from the main body portion 16a at the same angle as that of the first arm portion 16b, and the narrow flat portions protruding from the distal ends thereof serve as pin contact portions 16f. .
[0017]
An elastic portion 16g is connected to the pin contact portion 16f of the second arm portion 16c, and a second pad pressing portion 16h is connected to the pin contact portion 16f of the third arm portion 16d. 16g is formed by bending a strip having the same width as the pin contact portion 16f back into a small U shape between the first pad pressing portions 16e and 16e, and the second pad pressing portion 16h is formed by the main body portion 16a. The strips having the same width as those of the first pad pressing portions 16e and 16e are bent in a large L shape outwardly.
[0018]
The pad spring 16 configured as described above allows the pin abutting portion 16 f of the second arm portion 16 c to move to the disk rotation when the friction pads 4 and 4 are suspended by the hanger pins 13 and 13 as described above. outlet side of the so preferably under the disc radially inside of the hanger pin 1 3, Rutotomoni engaged abutting engagement with the engaging groove 13a of the disk rotation exit side of the hanger pin 13, the pin contacting portion of the third arm portion 16d 16f is passed through the inner side in the disk radial direction of the hanger pin 13 on the disk insertion side and is brought into contact with and engaged with the engagement groove 13a of the hanger pin 13 on the disk insertion side . The first pad pressing part 16e is applied to the one pad pressing part 16e, and the first pad pressing part 16e is pressed on the outer side in the disk radial direction of the four hanging parts 15a of the friction pads 4 and 4, and the elastic part 16g is pressed on the disk delivery side. Hanger pin 3, the entire pad spring 16 is pulled in the disc delivery direction, and the second pad pressing portion 16 h is suspended by the suspension portion 15 a on the disc entry side of the friction pads 4, 4. 15a is pushed to the disk insertion side.
[0019]
As a result, the friction pads 4, 4 are urged inward in the radial direction of the disk by the four first pad pressing portions 16e, and the disk pad is rotated by the second pad pressing portion 16h independent of the first pad pressing portion 16e. It is urged in the orthogonal direction to the torque receiving portion 3k on the exit side. The urging force of the second pad pressing portion 16h acting on the disk insertion side of the disk insertion side hanging portions 15a, 15a is to suspend the friction pads 4, 4 by the two hanger pins 13, 13. Together, the friction pads 4 and 4 are pressed in the direction of the torque receiving portion 3k on the disk delivery side without inclining, and the torque transmission surface 15c on the disk delivery side of the back plate 15 is pressed against the torque delivery on the disk delivery side. Face the part 3k in parallel.
[0020]
In this embodiment, the four first pad pressing portions 16e and the second pad pressing portion 16h different from the first pad press the friction pads 4 and 4 when not in operation in advance in the disk radial direction and the disk. At the same time, the second pad pressing portion 16h urges the torque transmission surface 15c on the disk delivery side of each back plate 15 to the torque delivery portion on the disk delivery side. Since the surface is allowed to contact 3k without any gap, a predetermined braking force can be effectively exhibited from the beginning of braking without generating a rattling sound due to running vibration or a contact sound during braking.
[0021]
Further, in the present embodiment, among the four first pad pressing portions 16e of the pad spring 16, the urging force of the two first pad pressing portions 16e, 16e on the disk insertion side is set to the two first pad pressing side 16e. It can also be set larger than the urging force of the pad pressing portions 16e, 16e.
[0022]
In such a setting, a high torque is applied to the friction pads 4 and 4 due to sudden braking or an increase in braking force, and the component force on the outer side of the disk radial direction is applied to the disk insertion side of the friction pads 4 and 4. When the frictional pads 4 and 4 are to be tilted by generating a component force inside the disk in the radial direction on the side, the large urging forces of the two first pad pressing portions 16e and 16e on the disk insertion side are It effectively suppresses the movement of the friction pad 4, 4 on the disk entry side to rise to the outside in the disk radial direction, so that the contact between the torque receiving portion 3 k on the disk delivery side and the torque transmission surface 15 c with no gap is achieved. Therefore, it is possible to improve the durability of the entire disc brake by avoiding brake squeal and indentation due to local contact between the torque receiving portion 3k and the torque transmission surface 15c.
[0025]
【The invention's effect】
The disc brake for a vehicle according to the present invention has four first pad pressing portions for urging both friction pads inward in the radial direction of the disc on a pad spring disposed on the outer side of the friction pad in the radial direction of the disc, and both friction pads. By providing a second pad pressing part that abuts against the disk insertion side of the disk and urges these friction pads to the torque receiving part on the disk delivery side in the orthogonal direction, the friction pad when not in operation can be made independent. With the first and second pad pressing portions having the above shapes, the torque transmitting surfaces on the disk delivery side of each friction pad are simultaneously urged in the orthogonal direction to the torque receiving portion on the inner side in the disk radial direction and the disk delivery side in advance. Since the torque receiving part on the disk delivery side is supported on the surface without any gaps, no rattling noise due to running vibration or contact noise during braking is generated, and a predetermined amount of noise is not generated from the beginning of braking. It is possible to effectively exhibit the power.
[0026]
Further, among the four first pad pressing portions of the pad spring, the urging force of the two first pad pressing portions on the disk feeding side is larger than the urging force of the two first pad pressing portions on the disk feeding side. By setting it, even when a high torque is applied to the friction pad due to sudden braking or increased braking force, it effectively suppresses the movement of the friction pad toward the outside of the disk radial direction. In addition, since the contact between the torque receiving portion on the disk delivery side and the torque transmission surface is maintained without gaps, brake squeal and indentation due to local contact between the torque receiving portion and the torque transmission surface are prevented. By avoiding this, it is possible to improve the durability of the entire disc brake.
[Brief description of the drawings]
1 is a cross-sectional view taken along the line II in FIG. 2 showing an embodiment of the present invention. FIG. 2 is a partial cross-sectional plan view of a disc brake showing an embodiment of the present invention. 1 is a sectional view taken along line III-III in FIG. 1. FIG. 4 is an exploded perspective view of a friction pad, a pad spring, and a hanger pin according to an embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Disc brake 2 ... Disc rotor 3 ... Caliper body 3a, 3b ... Action part 3c ... Bridge part 3j, 3k ... Torque receiving part 4 ... Friction pad 5 ... Cylinder hole 7 ... Piston 8 ... Hydraulic pressure chamber 12 ... Ceiling opening part 13 ... Hanger pin 14 ... Lining 15 ... Back plate 15a ... Hanging part 15b ... Pin hole 15c ... Torque transmission surface 16 ... Pad spring 16a ... Body part 16b ... First arm part 16c ... Second arm part 16d ... Third arm Part 16e ... First pad pressing part 16f ... Pin contact part 16g ... Bulleting part 16h ... Second pad pressing part A ... Rotating direction of the disc rotor 2

Claims (2)

On both sides of the disc row data, a pair of friction pads disposed between the disk rotation exit side of the torque receiving portion during the torque receiving portion and the vehicle forward of the disk rotation entrance side when the vehicle forward of Kyaripabode I disc the suspended portion which is extended respectively to the disk rotation entrance side and the exit side disk rotation at the radially outer of the vehicle forward, the disk rotation at the time parallel to the vehicle forward and disk axis Kyaripabode I entry side and each side out disk rotation and bridged by the pair of hangers pins inserted respectively, the pair of friction pads with Jisuru suspended to be movable in the disk axial direction, a vehicle disc brake comprising a pad scan purine grayed the disk radially outwardly of said friction pad In
The pad scan purine grayed includes a central flat body portion, and four of the first arm portion protruding to be inclined respectively to one side towards the opposite side edges opposite ends of the body portion, projecting from one side edge center of the body portion one and a second arm portion which, and also one third arm protruding from the other side edge center of the body portion is formed by bending a metal sheet,
Each first arm part is lined with the main body portion and a plane parallel portion at its distal end, the flat surface portion of the first pad pressing part and without,
The second, third arm portion, said body portion or we first arm portion and protrude at the same angle, the plane portion of the narrow protruding from its front end, respectively the pin contacting part and without,
Resilient portion in the pin contacting portion of the second arm portion, also in the pin contacting portion of the third arm portion and the second pad pressing portion is continuously provided respectively,
The spring-section, the strip of the pin contact portion and the same width of the second arm portion, bent back in a U-shape between the two first pad pressing portion projecting from one side edge opposite ends of the body portion The second pad pressing part is formed by bending the other two first pad pressing parts protruding from both ends of the other side edge of the main body part into an L shape outwardly,
The pad scan purine grayed, the pin contact portion of the second arm portion, Hangapi at the disk rotation exit side during thereby preferably under the disc radially inwardly of Hangapi down the disk rotation exit side said vehicle advancing during the vehicle forward brought into contact engagement in emissions Rutotomoni, wherein the pin contact portion of the third arm portion, the disk rotating at preferably under allowed by said vehicle advancing in the disc radially inside of the hanger pin disk rotation entrance side when the vehicle travels forward inlet-side abutting engagement engaged to hanger pin, is respectively pressed four first pad pressing portion in the disk radially outward of the four suspended portion of the friction pad by the respective reaction force, the said spring-unit by elastic contact on the outlet side disk rotation when the vehicle travels forward at the disk rotation exit side of the hanger pin when the vehicle moves forward, the disk turn the whole of the pad scan purine grayed when the vehicle travels forward Towing direction, the second pad pressing portion is pressed against the disk rotation-in side during forward traveling of the vehicle of the hook member of the disk rotation entrance side when the vehicle forward of said pair of friction pads, a pair of friction pad A disk brake for a vehicle, wherein the disk is urged in a direction orthogonal to a torque receiving portion on the disk delivery side when the vehicle moves forward . First pad pressing portion of two of said second pad pressing portion side, according to claim 1, characterized in that setting the spring-side two large urging force also Ri by first pad pressing portion of Disc brake for vehicles.

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