JP2016038030A - Brake disc - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake disc capable of further improving braking force and improving operational feeling when braking.SOLUTION: A brake disc 1 is attached to an axle of a vehicle and intended to brake the vehicle via a brake pad 9 to be pressed. The brake disc 1 includes: a bracket part 2 attached to the axle of the vehicle; a disc part 3 against which the brake pad 9 is pressed; and coupling means 4 for relatively movably coupling the bracket part 2 and the disc part 3. The brake disc 1 includes drain holes 8 which are made up of a plurality of through holes formed in a sliding direction of the brake pad 9, and are capable of scraping a sliding surface of the brake pad 9 during sliding thereof. The drain holes 8 are distributed over the entire region of a width dimension of the brake pad 9.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a brake disc that is attached to an axle of a vehicle and brakes the vehicle by pressing a brake pad.

  As a brake device that is disposed in a vehicle such as a passenger car or a two-wheeled vehicle and can brake the vehicle, a disc brake device that includes a brake disk and a brake pad has come into widespread use. Such a disc brake device is configured to attach a brake disc to a wheel of a vehicle so as to be integrally rotatable, and to obtain a braking force by pressing a brake pad against the brake disc (for example, Patent Document 1). reference).

JP 2008-232441 A

  However, in the conventional brake disc, in addition to further improvement of the braking force, there has been a growing demand for further improving the operational feeling (operation feeling) during braking. Accordingly, the present applicant has eagerly studied to improve the operational feeling as well as further improving the braking force by utilizing a water drainage hole formed by a plurality of through holes formed on the sliding surface of the brake disk. It was. Such measures are not limited to the floating type brake disc in which the bracket portion and the disc portion are divided, but a so-called solid in which the portion attached to the axle of the vehicle and the portion where the brake pad is pressed is integrated. The same applies to brake discs called molds.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a brake disk that can improve the braking force and improve the operational feeling during braking.

  The invention according to claim 1 is a brake disk that is attached to an axle of a vehicle and brakes the vehicle by pressing a brake pad, or a plurality of through holes formed over the sliding direction of the brake pad or The scraping means is formed of a recess and capable of scraping the sliding surface in the process of sliding the brake pad, and the scraping means is distributed over the entire width of the brake pad. It is formed.

  According to a second aspect of the present invention, in the brake disc according to the first aspect, the scraping means is always distributed over the entire width dimension of the brake pad in the sliding process of the brake pad.

  According to a third aspect of the present invention, in the brake disc according to the first or second aspect, the bracket portion attached to the axle of the vehicle, the disc portion against which the brake pad is pressed, the bracket portion and the disc portion relative to each other. The scraping means is partly formed on the outer peripheral edge and the inner peripheral edge of the disk portion.

  According to a fourth aspect of the present invention, in the brake disc according to any one of the first to third aspects, the scraping means includes a round hole or a long hole, and an opening edge of the round hole or the long hole. The sliding surface of the brake pad can be scraped off.

  According to the first aspect of the present invention, the scraper is composed of a plurality of through-holes or recesses formed over the sliding direction of the brake pad and capable of scraping the sliding surface in the process of sliding the brake pad. As the means is formed, the scraping means is distributed over the entire width of the brake pad, so that the braking force can be further improved and the operational feeling during braking can be improved. Can do.

  According to the invention of claim 2, since the scraping means is always distributed over the entire width dimension of the brake pad in the sliding process of the brake pad, the braking force and the operational feeling during braking are further improved. Can do.

  According to invention of Claim 3, it has a bracket part attached to the axle of a vehicle, a disk part by which a brake pad is pressed, and a connection means which connects a bracket part and a disk part so that relative movement is possible. Part of the scraping means is formed on the outer peripheral edge and the inner peripheral edge of the disk part, so that the braking force is applied to the floating brake disk in which the bracket part and the disk part are divided. It is possible to further improve the operational feeling during braking.

  According to the invention of claim 4, the scraping means comprises a round hole or a long hole, and the sliding surface of the brake pad can be scraped off at the opening edge of the round hole or the long hole. The processing of the take-off means can be facilitated, the braking force can be further improved and the operational feeling during braking can be improved.

The top view which shows the brake disc which concerns on the 1st Embodiment of this invention II-II sectional view in FIG. Two views showing the insertion member of the connecting means in the brake disc Two views showing the color of the connecting means in the brake disc It is a figure which shows the disc spring of the connection means in the brake disk, (a) Top view (b) Longitudinal sectional view The enlarged view which shows the connection part vicinity by the connection means in the brake disc Plan view showing brake pads applied to the brake disc Sectional drawing which shows the brake pad applied to the brake disc Schematic diagram showing the action when scraping the sliding surface of the brake pad by the water drain hole of the brake disc Schematic diagram showing the distribution of drain holes in the brake disc (distribution to the brake pads at a given point in time) Schematic diagram showing the distribution of drain holes in the brake disc (distribution to brake pads when a predetermined time has elapsed from a predetermined time) The top view which shows the brake disc shown in other embodiment of this invention. The top view which shows the brake disc as a comparative example (no water drain hole formation) used in the experiment which shows the technical superiority of this invention The top view which shows the brake disc as a comparative example (water drain hole formed only in the center) used in the experiment which shows the technical superiority of this invention The top view which shows the brake disc as a comparative example (the drain hole is distributed near the center) used in the experiment showing the technical superiority of the present invention Graph of experimental results showing technical superiority of the present invention

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The brake disc according to the present embodiment is a member that is attached to a wheel of a vehicle such as a motorcycle and that can rotate integrally with the wheel, and that is configured to obtain a braking force by pressing a brake pad. 1 and 2, the bracket portion 2, the disk portion 3, and the connecting means 4 are configured. The brake disc 1 is made of a disk-shaped member having a front surface α and a back surface β.

  The bracket portion 2 is obtained by pressing a metal plate made of, for example, an aluminum alloy, and a plurality of mounting holes 2b are formed at predetermined positions. These mounting holes 2b are for inserting fastening means such as bolts and fixing the brake disc 1 to wheels (not shown) in a vehicle such as a motorcycle. In addition, the disk portion 3 is connected to the outer peripheral edge portion of the bracket portion 2 by connecting means 4 (floating pins), thereby constituting a disc-like brake disc 1 as an overall shape.

  The disk portion 3 is obtained by pressing a metal plate material such as stainless steel, and is composed of a substantially annular member that can slide when the brake pad 9 (see FIGS. 7 and 8) is pressed. α and back surface β are subjected to surface treatment for improving wear resistance, such as induction hardening. Further, a plurality of drain holes 8 (scraping means) are formed at a predetermined position of the disk portion 3 (sliding range of the brake pad 9). These drain holes 8 are made of through holes formed in the disk portion 3, and are formed by, for example, punching, etc., and can improve heat dissipation by increasing the surface area, reduce the weight of the brake disk 1, and the like. Has been.

  The brake pads 9 are made of a predetermined friction material, and are formed on a pair of pistons 11 held by a caliper 10 as shown in FIGS. Thus, when operating means such as a brake lever is operated, the brake fluid flows through the flow path b to displace the piston 11, and the brake pad 9 is pressed against the front surface α and the rear surface β of the disk portion 3 that rotates with the wheel to slide. It is configured to obtain a braking force by moving it.

  In the present embodiment, an opposed piston type having a pair of pistons 11 is applied, but other types (for example, the piston is disposed only on either one of the front and back surfaces of the brake disk 1, A type in which the caliper itself is displaced to the opposite side by the reaction force of the force pressing the brake pad, and the brake pad on the side without the piston is pressed against the brake disc 1 may be applied.

  The bracket portion 2 is formed with a plurality of connecting portions 2 a that are connected to the disk portion 3 by the connecting means 4, and the disk portion 3 is connected to the bracket portion 2 by the connecting means 4. Part 3a is formed. Specifically, as shown in FIG. 6, the connecting portion 2a of the bracket portion 2 is formed of a notch 2aa formed in a semicircular arc shape, and the connecting portion 3a of the disc portion 3 is formed in a semicircular arc shape. The bracket portion 2 and the disc portion 3 are connected by inserting the insertion member 5 (see FIG. 2) of the connecting means 4 into a portion formed by the notches 3aa and facing the notches 2aa and 3aa. It is comprised so that.

  The connecting means 4 is for connecting the bracket part 2 and the disk part 3 so that they can move relative to each other. As shown in FIG. 2, the insertion member 5, the collar 6, and the disc spring 7 (biasing means) are connected. It is configured. It should be noted that six connecting means 4 according to the present embodiment are attached to the brake disc 1 at predetermined positions (a connecting position between the bracket portion 2 and the disc portion 3) at approximately equal intervals on a concentric circle. 2 and the disk unit 3 are connected to each other.

  The insertion member 5 is inserted and attached between the connecting part 2a of the bracket part 2 and the connecting part 3a of the disk part 3 (specifically, between the notch 2aa and the notch 3aa). As shown in FIG. 3, the portion 3 is made of a cylindrical member having a through hole 5d formed at the center thereof. Further, the insertion member 5 is disposed on the surface α side of the connection portion 2a of the bracket portion 2 and the connection portion 3a of the disk portion 3 in a state of being inserted between the connection portion 2a of the bracket portion 2 and the connection portion 3a of the disk portion 3. A flange portion 5a capable of contacting, an insertion portion 5b positioned between the wall surface of the notch 2aa of the connecting portion 2a and the wall surface of the notch 3aa of the connecting portion 3a, and a caulking tip portion 5c. It is configured.

  The collar 6 is attached to the distal end portion 5c side of the insertion member 5 inserted between the coupling portion 2a of the bracket portion 2 and the coupling portion 3a of the disk portion 3, and holds the disc spring 7, as shown in FIG. As shown, a flange portion 6a and a through hole 6b are formed. Specifically, as shown in FIG. 2, the collar 6 and the disc spring 7 are attached to the distal end portion 5 c side of the insertion member 5 inserted between the connection portion 2 a of the bracket portion 2 and the connection portion 3 a of the disk portion 3. Thereafter, the collar 6 can be attached in a state where the disc spring 7 is held by caulking the tip 5c.

  The disc spring 7 is attached to the insertion member 5 via the collar 6 and can abut against the back surface β side of the connecting portion 2a of the bracket portion 2 and the connecting portion 3a of the disc portion 3 to apply a biasing force. As shown in FIG. 5, the edge 7a and the through-hole 7b are formed. That is, the disc spring 7 is attached with the peripheral portion of the through hole 7b contacting the collar 6 and the edge portion 7a contacting the back surface β side of the connecting portion 2a of the bracket portion 2 and the connecting portion 3a of the disc portion 3. Thus, the urging force can be applied to the bracket part 2 and the disk part 3 side. Instead of the disc spring 7, other general-purpose urging means (coil spring, soft resin, etc.) may be used.

  Thus, by attaching the connecting means 4 between the connecting portion 2a of the bracket portion 2 and the connecting portion 3a of the disk portion 3, as shown in FIG. 6, the insertion portion 5b of the insertion member 5 and the notch of the connecting portion 2a are provided. The clearance t is provided between the wall surface of 2aa and the wall surface of the notch 3aa of the connecting portion 3a, and the bracket portion 2 and the disk portion 3 are relatively movable at least by the clearance t. Accordingly, when the vehicle is braked, when the disk portion 3 generates heat due to sliding of the brake pad 9 and expands, it can be moved relative to the bracket portion 2. It is possible to avoid the occurrence of deformation accompanied by distortion or the like.

  Furthermore, the brake disc 1 according to the present embodiment includes a plurality of through holes formed over the sliding direction of the brake pad 9 (circumferential direction of the disc portion 3), and the brake pad 9 is in the process of sliding. A drain hole 8 is formed as a scraping means capable of scraping the sliding surface. A plurality of such drain holes 8 are formed on the sliding surface of the brake pad 9 in the brake disc 1, and during braking, the sliding of the brake pad in the process of sliding the drain pad 8 as shown in FIG. The moving surface is scraped off at the opening edge portion 8a (edge portion) of the water draining hole 8, so that the moving surface is successively updated to a new surface and the braking force can be maintained for a long period of time. In this embodiment, the scraping means is a drain hole 8 which is a through hole, but a plurality of recesses (stop holes or grooves which do not penetrate) formed along the sliding direction of the brake pad. Also good.

  Here, the drain holes 8 (scraping means) according to this embodiment are distributed over the entire width dimension L of the brake pad 9 (specifically, the length of the brake pad 9 is shown in FIGS. 10 and 11). A plurality of drain holes 8 are distributed over the entire width dimension L within the range of the width dimension M), and the brake pad 9 is always in the sliding process of the brake pad 9. Are distributed over the entire width dimension L. That is, as shown in FIG. 10, the distribution of the drain holes 8 is distributed over the entire width dimension L of the brake pad 9, and a predetermined time has elapsed from that point. Even when the brake pad 9 is sliding in any other position, the drain holes 8 are distributed over the entire width dimension L of the brake pad 9 as shown in FIG. In addition, the code | symbol A in the figure has shown the rotation direction of the brake disc 1. FIG.

  In particular, the drain hole 8 according to the present embodiment is composed of a plurality of round holes formed in the sliding range of the brake pad 9, and a part thereof is formed at the outer peripheral edge and the inner peripheral edge of the disk portion 3. Yes. The drain holes 8 formed in the outer peripheral edge and the inner peripheral edge of the disk portion 3 are part of a round hole, and the outer peripheral edge and the inner peripheral edge are notched (a part of the disk portion 3 The shape facing the side). Thus, the plurality of drain holes 8 are distributed in the radial direction from the outer peripheral edge portion to the inner peripheral edge portion of the disk portion 3. The drain hole 8 according to the present embodiment is a round hole. However, as shown in FIG. 12, for example, it may be a scraping means comprising a long hole 8 '.

Next, the results of experiments (general efficacy tests) showing the technical superiority of the present invention are shown below.
A plurality of drain holes 8 in the disk portion 3 are formed so as to be distributed over the entire width dimension L of the brake pad 9, and always in the entire width dimension L of the brake pad 9 during the sliding process of the brake pad 9. Example j (see FIGS. 1 and 2) that is distributed, comparative example h1 (see FIG. 13) in which no drainage hole 8 is formed in the disk part 3, and the drainage hole 8 only in the center of the disk part 3 Is distributed (but 46% of the width L of the brake pad 9 is distributed) and the drain hole 8 is distributed near the center of the disk portion 3 (however, the brake pad 9 is distributed). Comparative Example h3 (see FIG. 15) having a distribution of 76% with respect to the width dimension L) was prepared. As the experimental conditions, when the vehicle weight is 272 kg, the third effect, and the braking initial speed is 130 km / h, the braking torque (Nm) of Example j and Comparative Examples h1 to h3 is the result shown in the graph of FIG. It became.

  According to the experimental results, as shown in the figure, the time for braking (time to stop) is shorter in Example j than in Comparative Examples h1 to h3, and the braking torque is reduced from the start of braking. It was found that the time to reach the peak was short and the initial braking torque peak (the braking torque peak immediately after the start of braking) was high. Thus, a plurality of drain holes 8 in the disk portion 3 are formed so as to be distributed over the entire width dimension L of the brake pad 9, and the width dimension of the brake pad 9 is always in the sliding process of the brake pad 9. In Example j distributed over the entire L range, the braking force is high because the time to stop is short, and the peak of the braking torque from the start of braking is high, so that the feeling of operation is excellent (immediately after the braking operation is performed). The brake starts to work.

  According to the above-described embodiment, the water drainage hole 8 (consisting of a plurality of through holes formed over the sliding direction of the brake pad 9 and capable of scraping the sliding surface in the process of sliding the brake pad 9 ( Scraping means) is formed, and the drain holes 8 are formed so as to be distributed over the entire width L of the brake pad 9, so that the braking force can be further improved and the operation during braking can be improved. A feeling (operation feeling) can be improved. In particular, since the scraping means according to the present embodiment is always distributed over the entire width dimension L of the brake pad 9 during the sliding process of the brake pad 9, the braking force and the operational feeling during braking are further improved. be able to.

  Moreover, according to this embodiment, the bracket part 2 attached to the axle of the vehicle, the disk part 3 against which the brake pad 9 is pressed, and the connecting means 4 that connects the bracket part 2 and the disk part 3 so as to be relatively movable. Since the drain hole 8 (scraping means) is partly formed on the outer peripheral edge and the inner peripheral edge of the disk part 3, the bracket part 2 and the disk part 3 are divided. With respect to the floating type brake disc 1, the braking force can be further improved and the operational feeling during braking can be improved.

  Furthermore, the scraping means (water draining holes 8, 8 ′) according to the present embodiment is formed of a round hole (or a long hole), and the sliding surface of the brake pad 9 is provided at the opening edge of the round hole or the long hole. Since scraping is possible, the machining of the drain holes 8, 8 'is facilitated, the braking force can be further improved and the operational feeling during braking can be improved. The scraping means is not limited to the drain holes 8 and 8 'according to the present embodiment, and may be through holes having other shapes.

  Although the present embodiment has been described above, the present invention is not limited to this, and for example, a bracket part that is attached to an axle of a vehicle and a part that is pressed against the brake pad 9 are integrated brake disks (so-called so-called brake disks). In the solid type), scraping means may be distributed over the entire width dimension L of the brake pad 9 with respect to the portion where the brake pad 9 slides.

  The scraping means is formed of a plurality of through holes formed in the sliding direction of the brake pad, and scraping means capable of scraping the sliding surface in the process of sliding the brake pad is formed. As long as the brake disc is formed in a plural number so as to be distributed over the entire width dimension of the brake pad, it may be of another shape or one having other functions.

DESCRIPTION OF SYMBOLS 1 Brake disc 2 Bracket part 3 Disc part 4 Connection means 5 Insertion member 6 Collar 7 Disc spring (biasing means)
8 Water drain hole (scraping means)
9 Brake pad 10 Caliper 11 Piston α Front side β Back side

Claims (4)

In a brake disc that is attached to the axle of a vehicle and brakes the vehicle by pressing a brake pad,
A plurality of through-holes or recesses formed across the sliding direction of the brake pad, and a scraping means capable of scraping the sliding surface in the process of sliding the brake pad is formed. The brake disc, wherein the scraping means is formed distributed over the entire width of the brake pad.   2. The brake disc according to claim 1, wherein the scraping means is always distributed over the entire width dimension of the brake pad in the sliding process of the brake pad.   A bracket portion attached to an axle of a vehicle; a disc portion to which the brake pad is pressed; and a connecting means for connecting the bracket portion and the disc portion so as to be relatively movable, and the scraping means is The brake disk according to claim 1 or 2, wherein a part of the brake disk is formed on an outer peripheral edge and an inner peripheral edge of the disk portion.   The scraping means comprises a round hole or a long hole, and the sliding surface of the brake pad can be scraped off at the opening edge of the round hole or the long hole. The brake disc as described in any one of these.

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