JP4926121B2 - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake for suppressing the inclination and vibration of a caliper resulting from a clearance between a sliding pin mounted on the caliper and a pin hole of a carrier. <P>SOLUTION: The disc brake includes the carrier 12 fixed to the non-rotation part of a vehicle for slidably supporting a friction pad 13 in a disc axial direction, and the caliper 16 slidably supported via the sliding pin 15 in the disc axial direction by the carrier 12 for thrusting the friction pad 13 against a disc 10. Herein, an elastic member 33 is provided which has one end 46 fixed to an arm portion 21 of the caliper 16 on which the sliding pin 15 is mounted, and the other end 41 for abutting on the outside of the carrier 12 in a disc circumferential direction to thrust the carrier 12 inward in the disc circumferential direction. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a disc brake used for braking a vehicle.

A disc brake used for braking a vehicle is fixed to a non-rotating portion of the vehicle and supports a friction pad so as to be slidable in the disc axial direction. The carrier is slid in the disc axial direction via a slide pin. There is a pin slide type disc brake that is movably supported and has a caliper that presses the friction pad against the disc. In such a pin slide type disc brake, a clearance is provided between the slide pin and the pin hole of the carrier in order to make the carrier and the caliper slide smoothly. In order to suppress the caliper vibration caused by the clearance, there is a technique of arranging the center of gravity of the caliper within the range of the fitting length of the slide pin (see, for example, Patent Document 1).
JP 2000-46076 A

  However, for example, due to the interference with the wheel, the center of gravity of the caliper may not be disposed within the range of the sliding pin fitting length. In this case, in particular, in the case of a caliper with a parking brake mechanism, since the parking brake cable is attached, an external force that tries to return the cable to the free state acts on the caliper. It tilts with respect to the disc, the axial gap between the pad and the disc decreases, and there is a possibility that drag torque will increase and abnormal noise may occur. Even if the center of gravity of the caliper can be arranged within the range of the fitting length of the slide pin, a sufficient effect may not be obtained.

  Therefore, an object of the present invention is to provide a disc brake capable of suppressing caliper inclination and vibration caused by a clearance between a slide pin attached to a caliper and a pin hole of a carrier.

In order to achieve the above object, according to the present invention, one end is fixed to the upper arm in the vertical direction of the arm to which the slide pin of the caliper is attached, and the other end is applied to the outer side of the carrier in the disk circumferential direction. An elastic member that contacts and presses the carrier inward in the disk circumferential direction was provided.

  According to the present invention, the elastic member having one end fixed to the arm portion to which the slide pin of the caliper is attached comes into contact with the outer side in the disk circumferential direction of the carrier at the other end, thereby Therefore, even if there is a clearance between the slide pin and the pin hole of the carrier, the inclination and vibration of the caliper can be suppressed.

“First Embodiment”
A first embodiment of the present invention will be described below with reference to FIGS.
1 and 2 show a disc brake 1. The disc brake 1 includes a disc 10 that rotates integrally with a vehicle wheel, a carrier 12 that is disposed so as to straddle the outer peripheral side of the disc 10 and is fixed to a non-rotating portion of the vehicle with two attachment portions 11, A pair of friction pads 13 slidably supported on the carrier 12 in a state of being disposed on both sides of the disk 10 in the axial direction, and supported on the carrier 12 via a pair of slide pins 15 so as to be slidable in the disk axial direction. The caliper 16 is mainly composed.

  The caliper 16 includes a cylinder 18 disposed on the side opposite to the disk 10 of one pad 13, a disk path portion 19 extending from the cylinder 18 across the outer periphery of the disk 10, and the disk path portion 19. A caliper body 22 having a claw portion 20 extending from the other pad 13 so as to face the opposite side of the disc 10 and a pair of arm portions 21 projecting from the cylinder 18 to both sides in the circumferential direction of the disc 10. And a piston (not shown) inserted into the cylinder 18.

  The caliper 16 has slide pins 15 attached to the pair of arm portions 21 so as to extend toward the claw portion 20 along the disk axial direction, and these slide pins 15 slide into the pin holes 24 of the carrier 12. It is attached to the carrier 12 by being fitted.

  The caliper 16 moves the piston in the direction of the pad 13 by the brake fluid pressure introduced between the cylinder 18 and the piston, so that the piston and the claw portion 20 hold the pair of pads 13 from both sides. Thus, the disk 10 is brought into contact with the disk 10 to brake the rotation of the disk 10. At this time, the slide pin 15 slides the pin hole 24 to adjust the position of the carrier 12 and the disk 10 in the disk axial direction.

  Further, on the cylinder 18 side of the caliper 16, there is provided a parking brake mechanism 26 that mechanically moves the piston not by the brake hydraulic pressure but by rotation of the operating lever 25 to bring the pair of pads 13 into contact with the disk 10. Yes. The operating lever 25 of the parking brake mechanism 26 is connected to a parking brake lever (not shown) provided in the vehicle compartment via a cable 28 supported by a cable guide 27 fixed to the caliper 16. A manual operating force is transmitted through the cable 28 and rotates.

  Here, the slide pin 15 is attached to the arm portion 21 by being screwed into the attachment bolt 30 penetrating the arm portion 21. A telescopic boot 31 is attached between the outer peripheral portion of the slide pin 15 on the mounting bolt 30 side and the opening side of the pin hole 24.

  In the first embodiment, a spring member (elastic member) 33 is provided on the arm portion 21 of the caliper 16, which is fastened together with the mounting bolt 30 described above. This spring member 33 is integrally formed from a single spring steel material by press molding. As shown in FIG. 3, a wide substrate portion 34 and a narrower shape than the substrate portion 34 are tapered from the substrate portion 34. A pair of sandwiching plate portions 36 that extend perpendicularly to the substrate portion 34 from opposite edges in the width direction of the substrate portion 34, and these sandwiching plate portions 36 has a pair of attachment plate portions 37 that extend perpendicularly to the sandwiching plate portion 36 from the edge opposite to the extending direction of the spring portion 35 and extend toward the adjacent sides.

The substrate portion 34 and the spring portion 35 are formed with a plurality of reinforcing ribs 40 extending in the extending direction of the spring portion 35, specifically, at two locations.
The spring portion 35 is bent in an inclined shape from the midway position in the extending direction so that the locking portion 41 at the tip is located on the extending side of the holding plate portion 36.

In the pair of sandwiching plate portions 36 that are parallel to each other, an engagement portion 42 is bent at the end opposite to the respective substrate portions 34 so as to protrude toward the mutually close side.
The pair of mounting plate portions 37 are arranged on the same plane, and arc-shaped cutout portions 44 that form insertion holes 43 through which the mounting bolts 30 are inserted are formed on the adjacent sides.

  In such a spring member 33, a pair of clamping plate portions 36 provided at one end thereof are put on the arm portion 21 so as to clamp the arm portion 21 from the inner side and the outer side in the disk radial direction. In this state, when the mounting bolt 30 inserted into the insertion hole 43 of the pair of mounting plate portions 37 provided at one end portion penetrates the arm portion 21 and is screwed and fixed to the slide pin 15, the mounting bolt A pair of attachment plate portions 37 is sandwiched and fixed between the arm 30 and the arm portion 21.

In this manner, the spring member 33 has the fixing portion (one end portion) 46 composed of the substrate portion 34, the pair of clamping plate portions 36 and the pair of attachment plate portions 37 fixed to the arm portion 21. With the fixing portion 46 attached to the arm portion 21 in this way, the spring member 33 has the spring portion 35 extending in the direction of the carrier 12, and a locking portion (other end portion) 41 at the tip, that is, the other end. The side abuts on the outer circumferential side surface 47 of the carrier 12. At this time, the spring portion 35 is elastically deformed, and as a result, the carrier 12 is pressed inward in the disk circumferential direction. As is clear from FIG. 1, the locking portion 41 of the spring member 33 abuts on the outer side in the disk circumferential direction of the carrier 12 within the range of the fitting length of the slide pin 15.

Here, the carrier 12 and the caliper 16 described above are arranged on the front side or the rear side with respect to the disk 10 when the vehicle is mounted. At this time, one arm portion 21 is placed on the upper side and the other arm portion 21 is placed on the lower side. Will be placed on the side. And the above-mentioned spring member 33 is attached to the arm part 21 arrange | positioned at a perpendicular direction upper side. As a result, the caliper 16 is pulled up in the direction of releasing caulking due to its own weight and the input of the cable 28.

That is, first, point A in FIG. 1 indicates the position of the center of gravity of the caliper 16, and the moment M 1 acts on the caliper 16 with respect to the mouth B point of the carrier 12 due to its own weight. When the weight of the caliper 16 is W1 and the distance from the pin hole mouth point B of the carrier 12 to the center of gravity A of the caliper 16 is L1, M1 = L1 × W1. As is apparent from FIG. 1, the center of gravity of the caliper 16 is outside the range of the fitting length of the slide pin 15.

  The caliper 16 is attached with a cable 28 of the parking brake mechanism 26. The cable 28 is attached to a cable guide 27 that is bent in the Y direction and fixed to the caliper 16. Therefore, the caliper 16 is loaded with a load in the Z direction in which the cable 28 returns to the free state, so that the moment M2 acts. If the return force of the cable 28 is W2 and the distance from the pin hole mouth point B of the carrier 12 to the mounting position of the cable 28 is L2, M2 = L2 × W2.

  The caliper 16 is inclined in the X direction in the figure by the moments M1 and M2. On the other hand, the above-described spring member 33 pulls up the fixing portion 46 to the arm portion 21 of the caliper 16 in the C direction with the locking portion 41 contacting the circumferential outer side surface 47 of the carrier 12 as a fulcrum. Generates spring force. This spring force causes a moment M3 in the C direction to act on the caliper 16. When the lifting force is W3 and the distance from the pin hole mouth point B of the carrier 12 to the fixing portion 46 of the spring member 33 is L3, M3 = L3 × W3.

  Here, by making M3 substantially equal to M1 + M2, it is possible to prevent the caliper 16 from tilting in the X direction. Note that if M3 is excessive, the caliper 16 is inclined due to the occurrence of a counterclockwise moment, and the contact portion between the circumferentially outer side surface 47 of the carrier 12 and the locking portion 41 of the spring member 33. Therefore, the caliper 16 may not be able to move smoothly with respect to the carrier 12, so that the set value of M3 is preferably M1 <M3 ≦ M1 + M2.

  Specifically, when L1 = 29 mm, L2 = 69 mm, L3 = 35 mm, W1 = 15N, W2 = 11N, W3 = 20N, the moments are M1 = 435 N · mm, M2 = 759 N · mm, M3 = 700 N · mm And

  According to the first embodiment described above, the spring member 33 in which the fixing portion 46 at one end is fixed to the arm portion 21 to which the slide pin 15 of the caliper 16 is attached is the locking portion 41 of the spring portion 35 at the other end. In order to press the carrier 12 inward in the circumferential direction of the disk by abutting the side surface 47 of the carrier 12 in the circumferential direction of the disk, the clearance for sliding between the slide pin 15 and the pin hole 24 of the carrier 12 is Even if there is, the inclination and vibration of the caliper 16 can be suppressed.

  In addition, since it is possible to cope with the production vehicle by simply adding the spring member 33, it is possible to easily cope with a low lead time at a low cost. In other words, the basic structure of the caliper 16 is not required to be changed, and there is no adverse effect on the change. Therefore, the setting can be performed without special evaluation.

“Second Embodiment”
A second embodiment of the present invention will be described below with reference to FIGS. 4 to 6 focusing on differences from the first embodiment. In addition, the part similar to 1st Embodiment is abbreviate | omitting the description as the same name and the same code | symbol.

  In the second embodiment, a spring member (elastic member) 50 different from that of the first embodiment is used. That is, the spring member 50 of the second embodiment includes a wide substrate portion 51, a spring portion 52 that is narrower than the substrate portion 51 and extends from the substrate portion 51 in a tapered shape, and the width direction of the substrate portion 51. And a pair of reinforcing plate parts 53 extending perpendicularly to the substrate part 51 from the opposite edge parts. The spring member 50 is also integrally formed from a single spring steel material by press molding.

A plurality of attachment holes 55 penetrating in the plate thickness direction are formed in the substrate portion 51 on the side opposite to the spring portion 52 so as to be spaced apart in the width direction.
The spring portion 52 is bent in an inclined shape so that the locking portion 56 at the tip is located on the bending side of the reinforcing plate portion 53 from the middle position in the extending direction.

  In such a spring member 50, the end portion of the base plate portion 51 located at one end of the spring member 50 is brought into contact with the side surface 58 of the arm portion 21 on the outer side in the disk circumferential direction. In this state, when the mounting screw 60 inserted into the mounting hole 55 from the outer side in the disk circumferential direction is screwed and fixed to the screw hole 61 of the arm portion 21, the board portion 51 is fixed to the mounting screw 60 and the arm portion 21. Is clamped and fixed. With the spring member 50 attached to the arm portion 21 in this way, the spring portion 52 extends in the direction of the carrier 12, and the locking portion 56 at the tip, that is, the other end side is the outer side in the disk circumferential direction of the carrier 12. Abuts against the side surface 47. At this time, the spring portion 52 is elastically deformed, and as a result, the carrier 12 is pressed inward in the disk circumferential direction as in the first embodiment. The spring member 50 of the second embodiment is not fastened together with the mounting bolt 30 for attaching the slide pin 15 to the arm portion 21 as in the first embodiment, but is fixed to the arm portion 21 by a dedicated mounting screw 60. Is done.

It is a front view which shows the disc brake of 1st Embodiment of this invention. It is a side view which shows the disc brake of 1st Embodiment of this invention. The spring member used for the disc brake of 1st Embodiment of this invention is shown, (a) is a top view, (b) is a side view, (c) is a front view. It is a front view which shows the disc brake of 2nd Embodiment of this invention. It is a top view which shows the disc brake of 2nd Embodiment of this invention. It is a side view which shows the disc brake of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc brake 10 Disc 12 Carrier 13 Friction pad 15 Slide pin 16 Caliper 21 Arm part 33, 50 Spring member (elastic member)
41, 56 Locking part (other end part)
46 fixed part (one end)

Claims (3)

A carrier fixed to the non-rotating part of the vehicle and supporting the friction pad so as to be slidable in the disk axial direction;
Is slidably supported in the axial direction of the disk via a pair of slide pins to said carrier, the disc brake Ru and a caliper for pressing the friction pad to the disc,
One end is fixed to the upper arm of the caliper to which the slide pin is attached, and the other end abuts on the outer side of the carrier in the disk circumferential direction so that the carrier is in the disk circumferential direction. disc brakes, wherein the elastic member for pressing inwardly is al provided. The caliper has a parking brake mechanism that mechanically moves a piston in the caliper by an operating force transmitted through a cable, and the center of gravity of the caliper is out of the range of the fitting length of the slide pin. The disc brake according to claim 1, wherein 3. The disc brake according to claim 1, wherein the other end portion of the elastic member abuts on the outer side in the disc circumferential direction of the carrier within a range of a fitting length of the slide pin.

Images