JP2008180322A - Disk brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk brake device in which contamination on the front surface of a wheel by the abrasion powder produced during braking is reduced. <P>SOLUTION: This disk brake device comprises a disk rotor 12 rotating together with an axle; a caliper 10 pressing a pair of friction members 16 against the frictional sliding surface of the disk rotor 12 to generate a braking force; and a baffle body 44 striding over the disk rotor 12 in the direction of thickness in a position at a predetermined distance from the caliper 10 on the downstream side of forward rotation of the disk rotor 12. The baffle body 44 guides air including abrasion powder generated when the disk rotor and the friction members come into contact with each other and discharged in the traveling direction toward the inner surface side of the disk rotor, that is, in the opposite direction to the traveling direction. The baffle body 44 comprises a rear surface part guiding the flow direction of the traveling air to the inner surface side of the disk rotor 12; and a blocking surface part 48 blocking the discharging direction of the discharged abrasive powder and allowing the abrasive powder in the air flowing along the rear surface part 46 to flow out. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disc brake device, and more particularly to a technique for reducing dirt on a wheel due to wear powder generated by scraping a disc rotor or a friction material during braking by the disc brake device.

  Conventionally, there is a disc brake device as a device for braking with a moving body such as an automobile. This disc brake is composed of a disc rotor and a caliper that rotate together with the wheels. The caliper has a housing portion that forms an outer shape and functions as a cylinder, and a mount that includes a torque receiving surface that fixes the caliper itself to the vehicle body and receives braking torque generated during braking. The housing portion includes a piston, and includes a pair of friction materials arranged with a disc rotor interposed therebetween, and a pair of pad backing plates that respectively support the friction materials. For example, convex guide portions are formed at both ends of the pad back metal, and the pad back metal is supported by the mount by engaging with a groove forming a torque receiving surface of the mount. In the disc brake device having such a configuration, when the hydraulic pressure is introduced between the housing portion and the piston, the guide portion slides in the groove and moves to the disc rotor side, and the friction material is pressed against the disc rotor to be controlled. Generate power.

  As described above, the disc brake device generates a braking force by friction between the disc rotor and the friction material. As a result, at the time of braking, either one or both of the disk rotor and the friction material are scraped to generate wear powder.

  By the way, when the vehicle is traveling, a part of the traveling wind flowing from the bottom of the body flows from the inside to the outside of the vehicle. Further, part of the traveling wind that flows out of the vehicle flows through a through hole formed through the front and back of the wheel. The traveling wind flowing through the wheel cools the disk rotor and the friction material during braking. On the other hand, this traveling wind also carries the wear powder generated by the contact between the disk rotor and the friction material toward the through hole. As a result, the wear powder adheres to the periphery of the wheel through-hole and the wheel surface. This causes the wheel to become dirty. Adhering wear powder is difficult to remove and also causes rust, which is one of the causes of deterioration of the wheel appearance.

In view of this, a device for reducing the contamination of the wheel due to wear powder has been proposed. For example, in Patent Literature 1, a brake pad caliper mount is provided with a cover that covers the downstream side in the rotational direction of the outer friction surface of the brake rotor vehicle, thereby introducing brake pad wear powder to the radially outer side or the vehicle inner side. Disc brakes are disclosed.
Japanese Patent Laid-Open No. 9-257062

  However, in the case of the structure of Patent Document 1, in order to prevent air containing wear powder from flowing outside the vehicle, it extends from the caliper mount to the downstream side in the brake rotor rotation direction so as to cover the vehicle outer wear surface of the brake rotor. A large cover is attached. A large cover tends to deposit wear powder on the inner wall of the cover. The accumulated wear powder may be peeled off from the inner wall of the cover due to vibration during travel, turbulence in the travel wind, changes in the strength of the travel wind, and the like. The detached wear powder may flow out again in the wheel side direction and contaminate the wheel. In addition, since the cover is large, the air flow becomes unstable inside the cover, and the air that has once flowed to the inside of the vehicle may flow to the outside of the vehicle, carrying the wear powder to the wheel surface side and contaminating the wheel. Furthermore, in the vehicle underbody, weight reduction of the unsprung load is an important design consideration, but it is not desirable from the viewpoint of weight reduction to provide a large and heavy cover only to reduce the dirt on the wheel.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a disc capable of reducing the contamination of the wheel by suppressing the abrasion powder generated during braking from being discharged to the outside of the vehicle, that is, the surface of the wheel. It is to provide a brake device.

  In order to solve the above-described problems, a disc brake device according to the present invention straddles a disc rotor rotating with an axle and the disc rotor in a thickness direction, and presses a pair of friction materials against a friction sliding surface of the disc rotor. A caliper for generating a braking force on the disc rotor, and straddling the disc rotor in the thickness direction at a position separated from the caliper by a predetermined distance on the forward rotation downstream side of the disc rotor, and the disc rotor and the friction material And a wind guide that guides the wear powder discharged in the forward direction when it comes into contact with the travel wind received during the forward travel in a predetermined direction. The wind guide reverses the flow direction of the travel wind to the forward direction. The rear portion inclined so as to be guided to the inner surface side of the disk rotor in the direction and the discharge direction of the discharged wear powder, A shielding surface to flow out placed on a running wind flowing along the rear portion, and having a.

  In this embodiment, the air guide can be formed by bending a small piece of metal, for example. It can also be made by resin molding. The wind guide body is directed to the inner surface side of the disk rotor, that is, on the inner side of the vehicle body opposite to the side on which the wheel is fixed, in the direction opposite to the forward direction with the flow direction of the traveling wind directed from the front to the rear when the vehicle moves forward by the rear portion. Change to face. Further, the wind guide body blocks the flying of the abrasion powder generated at the time of braking by the shielding surface portion and puts it on the traveling wind whose flow direction is changed to the inner surface side of the disk rotor. In this wind guide body, the position separated from the caliper by a predetermined distance on the downstream side of the forward rotation of the disk rotor is the radial line connecting the disk rotor center on the trailing side of the caliper on the trailing side of the caliper. For example, it is a position inclined about 10 ° to 30 ° downstream. The wind guide body of this aspect functions particularly suitably when the caliper is viewed from the front surface side of the wheel, for example, when the caliper is arranged in the range of about 9 o'clock to 12 o'clock of the clock position.

  According to this aspect, a part of the traveling wind is guided to the inner peripheral side of the disk rotor by the back surface portion of the wind guide body. Further, the shielding surface portion of the wind guide body blocks the flying direction of the abrasion powder discharged in the forward direction. Further, the air on the shielding surface portion side is sucked out by the air flowing through the back surface portion, and the air on the shielding surface portion side is exhausted along the shielding surface portion by the traveling wind flowing into the shielding surface portion side. As a result, the wear powder blocked in the flight direction rides on the traveling wind flowing through the back surface portion and flows out to the inner surface side of the disk rotor. In this way, since the traveling wind containing the wear powder can be actively guided to the inner surface side of the disk rotor, the degree of the wear powder fouling the wheel surface side can be reduced. It should be noted that a small piece of the air guide body is sufficient as long as the direction of the traveling wind is changed at the back surface portion, the wear powder is blocked by the shielding surface portion, and the wear powder is guided to the flow of the traveling wind. That is, the length of the air guide body may be several cm with respect to the circumferential direction of the disk rotor. Thus, by making a wind guide body into a small piece, it becomes possible to reduce possibility that abrasion powder will accumulate on a wind guide body, and it can prevent re-scattering. Here, the wear powder includes a case where the wear material is generated by cutting, a case where the disk rotor is generated by cutting, or a case where both of them are generated by cutting.

  Further, in the above aspect, the air guide body moves the wear powder along the shielding surface portion while reducing a flying force of the wear powder by generating a turbulent flow in the shielding surface portion, and the back surface portion. It may be caused to flow out on the traveling wind flowing along. According to this aspect, the air guide body reduces the flying force in the discharge direction of the wear powder discharged vigorously, and easily flows into the traveling wind whose direction is changed, so that the wear powder flows out to the wheel surface side. Can be reduced efficiently.

  Moreover, the said aspect WHEREIN: The said wind guide body may have a slit through which a part of driving | running wind which contact | winned the said back part passes. When a part of the traveling wind received during forward traveling passes through the slit, a turbulent flow can be effectively formed at the shielding surface portion. This turbulent flow can reduce the flying force of the wear powder, making it easier to join the wear powder to the traveling wind whose direction has been changed by the back surface portion, and efficiently reducing the wear powder from flowing to the wheel surface side.

  Moreover, the said aspect WHEREIN: You may make it the said wind guide body have a some protrusion in the said shielding surface part. By providing a plurality of protrusions on the shielding surface portion, an air separation surface is formed, and a turbulent flow can be effectively formed on the shielding surface portion. The flying force of the wear powder is reduced by the turbulent flow, and the wear powder is easily joined to the traveling wind whose direction is changed by the back surface portion.

  In the above aspect, the air guide body may be formed by curving a plate material. By making the air guide body a simple light weight structure in which the plate material is simply curved, it is possible to reduce the occurrence of wheel contamination due to wear powder while avoiding an increase in unsprung load. Further, since the structure of the air guide body is simple, the installation work is easy and it can contribute to cost reduction.

  Further, in the above aspect, the air guide body is configured such that the outer end portion in the radial direction of the disk rotor of the air guide body is more than the outer end portion in the radial direction of the disc rotor of the structure formed inside the wheel. It may be arranged so as to be located on the radially inner diameter side. For example, the inner wall side of the wheel may be icing at a low temperature or foreign matter may enter. In such a case, if the ice or the foreign object directly contacts the air guide body, the air guide body may be damaged, or the fixing posture may be changed, and the air flow including wear powder may not be guided to the inner surface side of the disk rotor. However, as described above, the structure in which the outer end in the radial direction of the disk rotor of the air guide is formed inside the wheel, for example, the outer end in the radial direction of the caliper in the radial direction of the disk rotor, By arranging so as to be positioned, the structure comes into contact with ice and foreign matter before the wind guide body. As a result, since ice and foreign matter are removed before coming into contact with the air guide body, it is possible to reliably prevent damage to the air guide body and maintain a fixed posture.

  According to the disc brake device of the present invention, the wear powder generated at the time of braking is positively guided to the inner surface side of the disc rotor by the wind guide body, so that the possibility that the wheel surface side is contaminated with the wear powder can be reduced.

  Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.

  The disc brake device of the present embodiment includes a disc rotor that rotates together with the axle, and a caliper that generates a braking force by pressing a pair of friction materials against the friction sliding surface of the disc rotor. Further, an air guide member is provided that straddles the disk rotor in the thickness direction at a position spaced a predetermined distance from the caliper on the downstream side of forward rotation of the disk rotor. The wind guide body guides the wear powder discharged in the forward direction when the disk rotor and the friction material come into contact with the traveling wind to the inner surface side of the disk rotor in the direction opposite to the forward direction. This wind guide body obstructs the inclined back surface portion that guides the flow direction of the traveling wind to the inner surface side of the disk rotor in the direction opposite to the forward direction during forward travel, and the flying direction of the exhausted wear powder. And a shielding surface portion for flowing out on the traveling wind flowing along. The disc brake device of the present embodiment flows out with the wear powder on the traveling wind directed toward the inner surface side of the disc rotor by the back surface portion. That is, the wear powder is guided in the direction opposite to the wheel surface to reduce the contamination of the wheel with the wear powder.

  FIG. 1 is a cross-sectional view of the caliper 10 of the disc brake device of the present embodiment and a surface orthogonal to the side surface 12a of the disc rotor 12 that rotates with a wheel (not shown). The caliper 10 of the present embodiment is roughly composed of a mounting portion 14, a pair of friction materials 16 (16 a and 16 b), a housing portion 18 that forms the outer shape of the caliper 10, and a piston 20. The friction material 16 generates a braking force by being pressed by the friction sliding surfaces which are the side surfaces 12 a on both sides of the disk rotor 12. The pair of friction members 16 are supported by pad backing plates 22 (22a, 22b) on the side that does not contact the disk rotor 12. In the case of FIG. 1, the friction material 16 is arranged as a first friction material 16 a and a second friction material 16 b with the disk rotor 12 interposed therebetween. The first friction material 16a is supported by the first pad back metal 22a, and the second friction material 16b is supported by the second pad back metal 22b.

  The caliper 10 is attached to the vehicle body via a mounting portion 14 so as to be displaceable in the directions of arrows A and B in FIG. As shown in FIG. 1, a bottomed hole 24 is formed in the housing portion 18 of the caliper 10, and the piston 20 is slidably fitted into the hole 24. A port 26 is provided at the bottom of the hole 24, and a hydraulic pressure supply source such as a master cylinder (not shown) is connected thereto. That is, when the driver operates the brake pedal, the brake fluid flows into the port 26 and drives the piston 20.

  When the brake fluid flows into the port 26, the piston 20 slides in the direction of arrow A in the figure from the non-operating state shown in FIG. 1, and the first friction material 16a is moved to the right of the disc rotor 12 via the first pad back metal 22a. To the side surface 12a. When the first friction material 16a is pressed against the disk rotor 12, the piston 20 stops sliding. Even after the piston 20 stops sliding, if the brake fluid flows into the port 26, the hydraulic pressure in the hole 24 increases. As a result, the stopped piston 20 conversely presses the inner surface of the hole 24 and presses the housing portion 18 in the direction of arrow B in FIG. Since the housing part 18 can be displaced in the directions of arrows A and B in the figure, the housing part 18 is displaced in the direction of arrow B in the figure as the hydraulic pressure increases.

  The housing part 18 includes a bridge part 18 a extending so as to straddle the disk rotor 12, and has a claw part 28 at the tip part thereof. As the housing portion 18 is displaced in the direction of arrow B, the claw portion 28 presses the left second friction material 16b against the left side surface 12a of the disc rotor 12 via the second pad back metal 22b. Therefore, the disk rotor 12 is pressed and clamped by the pair of first friction material 16a and second friction material 16b, and the disk rotor 12 can be braked efficiently.

  FIG. 2 is a schematic cross-sectional view showing a state where the disc brake device including the caliper 10 shown in FIG. A plurality of hub bolts 38 are erected on the hub 36 at the end of the axle 34 that is rotatable in the axle case 32. As shown in FIG. 2, in the example of this embodiment, the disk rotor 12 is fixed to the end face of the hub 36, and the hub bolt 38 protrudes in a state of passing through the disk rotor 12 to fix the wheel 30. That is, the disk rotor 12 and the wheel 30 rotate together with the axle 34. Further, the wheel 30 can be stopped by driving the caliper 10 and pressing the friction sliding surface of the disk rotor 12 with the friction material 16 to stop the disk rotor 12. A tire (not shown) is attached to the rim 40 in the width direction of the wheel 30. In the present embodiment, the inner surface side of the disk rotor 12, that is, the vehicle body center side opposite to the side on which the wheel 30 is fixed is prevented from hitting a rock stone or the like on the inner surface side of the disk rotor 12. For this purpose, a disk-shaped protection cover 42 is provided. The protect cover 42 is fixed to a non-rotating portion on the vehicle side such as the axle case 32, for example. In addition, the outer surface side (wheel 30 side) of the disk rotor 12 is protected from the jumping stone or the like by the wheel 30.

  As described above, when the caliper 10 is driven and the friction material 16 is pressed against the friction sliding surface of the disk rotor 12 in order to stop the rotation of the wheel 30, that is, to brake the vehicle, the friction material 16 and the disk rotor 12 are driven. One or both of them wear and generate wear powder. The wear powder is ejected vigorously in the tangential direction by the rotational force of the disk rotor 12. On the other hand, the wheel 30 is formed with a through hole penetrating the front and back of the wheel 30 for the purpose of improving the cooling performance of the disk rotor 12 and improving the design of the wheel 30. When the vehicle travels forward, part of the traveling wind received by the vehicle during forward travel passes through the bottom surface of the vehicle and flows from the inside to the outside of the disk rotor 12. As a result, the cooling effect of the disk rotor 12 as described above is exhibited. However, usually, a part of the wear powder generated in the caliper 10 is carried to the through hole of the wheel 30 by the traveling wind passing through the through hole and comes out on the surface of the wheel 30. This wear powder easily adheres to the through-holes of the wheel 30 and the surface of the wheel 30, is not easily dropped, and causes rust. As a result, the appearance of the wheel 30 is reduced.

  Therefore, in the present embodiment, as shown in FIG. 3A, the air guide body 44 is provided to straddle the disk rotor 12 in the thickness direction at a predetermined distance from the caliper 10 on the downstream side of the forward rotation of the disk rotor 12. . This wind guide body 44 is a traveling wind (indicated by the arrow W1) that flows from the front when the vehicle is traveling forward as indicated by the arrow P1, as indicated by the arrow P1, in the tangential direction (arrow P direction) of the rotational direction R of the disk rotor 12 when the vehicle moves forward. In the direction opposite to the forward direction and lead out to the inside of the disk rotor 12. In the example of FIG. 3A of the present embodiment, a case where the caliper 10 is disposed at a clock position at about 10 o'clock with respect to the vehicle traveling direction G (a forward direction parallel to the road surface) is described. To do.

  The wind guide body 44 reduces the flow direction of the traveling wind from the front to the rear (arrow W direction) when the vehicle moves forward, and the jet power (flying force) of wear powder generated during braking. And a shielding surface portion 48 that changes the flight direction so that it can smoothly merge with the traveling wind in the direction of arrow W1. The air guide body 44 is formed with a simple structure in which a plate material is curved. The shape of the air guide body 44 can be formed by, for example, pressing a metal thin plate or molding with a resin material. By making the air guide body 44 a simple shape, the light guide body 44 can be easily reduced in weight, and the occurrence of dirt on the wheel 30 due to wear powder can be reduced while avoiding an increase in the unsprung load of the suspension. Further, since the structure of the air guide body 44 is simple, the mounting work is easy and it can contribute to cost reduction. The air guide body 44 can be fixed to the protect cover 42 by means such as welding or screwing. The protect cover 42 may be bent toward the inner peripheral side of the disk rotor 12 at the joint portion between the protect cover 42 and the air guide body 44 so that the wear powder flows smoothly in the direction of the arrow W1 at the joint portion. In FIG. 3A, the wheel 30 is not shown.

  By disposing the protect cover 42 on the inner surface side of the disk rotor 12, wear powder generated during braking is present between the protect cover 42 and the inner surface side of the wheel 30. Therefore, a large amount of wear powder is present on the downstream side of the forward rotation of the disk rotor 12. In FIG. 3A, the flow of air containing wear powder, that is, the tangential direction of the disk rotor 12 in which the wear powder flies is indicated by an arrow P. Air around the rotating disk rotor 12 flows along the outer periphery of the disk rotor 12. Therefore, the abrasion powder generated at the contact position between the friction material 16 and the disk rotor 12 is also ejected vigorously along the outer periphery of the disk rotor 12. However, a part of the wear powder adheres to the inner surface 40a (see FIG. 2) of the rim 40 of the wheel 30. The abrasion powder adhering to the inner surface 40a does not deteriorate the appearance of the wheel 30, and even if the abrasion powder adheres to the inner surface 40a, it does not become a big problem. That is, the air guide body 44 is provided so as not to adhere to the inner surface 40 a of the rim 40 and to prevent wear powder that continues to float in the space on the inner surface side of the protect cover 42 and the wheel 30 from being emitted to the front surface side of the wheel 30. .

  The air guide body 44 of the present embodiment is disposed at a position separated from the caliper 10 by a predetermined distance on the downstream side of the forward rotation of the disk rotor 12. Specifically, the air guide body 44 has an angle α (for example, about 10 ° to 30 °) with respect to a radial line C 0 that passes through the trailing side end surface of the caliper 10 and connects the center of the disk rotor on the trailing side of the caliper 10. ) It can be placed at a position tilted downstream. It is desirable to adjust the arrangement position of the air guide body 44 in consideration of the radius of the disk rotor 12 and the generation pattern of wear powder for each vehicle type. In FIG. 3A, the air guide body 44 is arranged in the direction of about 12:00. In the present embodiment, the caliper 10 can be arranged at the clock position in FIG. In this case, the position of the air guide body 44 can be appropriately disposed at a position inclined in the range of about 10 ° to 30 ° toward the forward rotation downstream with respect to the position of the caliper 10.

  FIG. 3 (b) shows the caliper 10 and the air guide body 44 together with the cross-sectional view of the wheel 30 in order to facilitate understanding of the cross-sectional shapes of the caliper 10 and the air guide body 44. In this case, the section line A1 (the line that cuts the caliper 10 in the radial direction of the disk rotor 12) and the section line A2 (the air guide body 44 in the radial direction of the disk rotor 12) in FIG. Sectional drawing when the cross section is taken along line) is shown. Actually, the caliper 10 and the air guide body 44 are arranged close to each other as shown in FIG. In FIG. 3B, the periphery of the axle 34 is omitted.

  As shown in FIG. 3B, the cross-sectional shape of the air guide body 44 in the direction perpendicular to the side surface 12a of the disk rotor 12 is a needle shape, and wear powder generated by contact between the disk rotor 12 and the friction material 16 is removed. The air guide body 44 is temporarily trapped inside the needle shape.

  4A to 4C are explanatory views for more specifically explaining the shape of the air guide body 44. FIG. 4A is a perspective view of the air guide body 44, FIG. 4B is a right side view of FIG. 4A, and FIG. 4C is a top view of the air guide body 44. As shown in FIG. 3B, the air guide body 44 includes a back surface portion 46 that is the outside and a shielding surface portion 48 that is the inside and is the back side of the back surface portion 46. Further, folded portions 50 a and 50 b are formed on the side surface of the back surface portion 46 (shielding surface portion 48) (the portion facing the side surface 12 a of the disk rotor 12) so as to surround the outer periphery of the disk rotor 12. Further, as described above, the folded portion 50b on the inner side of the disk rotor 12 has means such as welding and screwing the air guide body 44 to the non-rotating portion on the vehicle side, such as the protect cover 42 (see FIG. 3B). A flange portion 50c is formed for fixing at the above.

  As shown in FIGS. 4A and 4B, the back surface portion 46 is inclined at a predetermined elevation angle (for example, 15 ° to 45 °) with respect to the downstream direction of the traveling wind (arrow W) received during forward traveling. . Further, the back surface portion 46 is inclined inward of the disk rotor 12 as shown in FIG. Therefore, a part of the traveling wind (arrow W) flowing substantially parallel to the ground flows along the back surface portion 46 of the air guide body 44, and is away from the caliper 10 as shown in FIGS. 4 (b) and 4 (c). While being guided to the inside of the disk rotor 12. That is, a part of the traveling wind flows in a direction away from the surface of the wheel 30 (arrow W1 direction).

  On the other hand, the shielding surface portion 48 which is the back side of the back surface portion 46 is also inclined at a predetermined elevation angle (for example, 15 ° to 45 °) with respect to the downstream direction of the traveling wind (arrow W). As shown in FIG. 3A, when the disk rotor 12 rotates in the direction of arrow R, the abrasion powder generated in the caliper 10 due to the rotational force is tangential to the disk rotor 12 as shown by arrow P. Fly to the wind guide body 44. The amount of wear is blocked by the shielding surface portion 48 in the flight direction, and is temporarily captured inside the air guide body 44. At this time, the air that exists in the narrow space between the shielding surface portion 48 side of the air guide body 44, that is, between the shielding surface portion 48 and the outer peripheral surface of the disk rotor 12, is sucked out in the arrow W 1 direction by the air flowing along the back surface portion 46. Further, the air flowing in from the traveling wind inlet 52 of the air guide body 44 also flows along the shielding surface portion 48. As a result, the wear powder in a state where the flying force is reduced and caught by the shielding surface portion 48 is guided in the direction of the arrow P1. The abrasion powder whose flying force is reduced by the shielding surface portion 48 can smoothly join the traveling wind whose flow direction is changed to the arrow W1 direction. FIG. 5 is an explanatory diagram for explaining the flow direction of traveling wind and wear powder. It is assumed that the wind guide body 44 receives the traveling wind in the direction of arrow G by traveling forward. As described above, in the caliper 10 portion, the abrasion powder generated by the contact between the disk rotor 12 and the friction material 16 and flying in the direction of the arrow P is temporarily reduced in flying force by the shielding surface portion 48 of the air guide body 44. On the other hand, a part of the traveling wind is changed from the direction of the arrow W to the direction of the arrow W1 by the back surface portion 46 of the air guide body 44. An arrow W1 direction is a direction away from the surface of the wheel 30 and is an inner side direction of the disk rotor 12. Further, as described above, the air on the shielding surface portion 48 side of the air guide body 44 is sucked out in the direction of the arrow W1 while being entrained in the air flowing along the back surface portion 46. Further, the traveling wind flowing in the direction of the arrow W also flows from the bottom of the air guide body 44 to the shielding surface portion 48 side, and flows along the inclined shielding surface. As a result, the wear powder flying in the direction of the arrow P and being caught by the shielding surface portion 48 easily rides the traveling wind whose direction is changed in the direction of the arrow W1, and as shown by the arrow P1, the disk rotor. It is discharged to the inside of 12.

  For example, when there is no air guide body 44, the abrasion powder (in the direction of arrow P) that is exhausted toward the traveling wind by the rotational force of the disk rotor 12 collides with the traveling wind flowing in the opposite direction (in the direction of arrow W). , Drifts irregularly inside the wheel 30. As described above, part of the traveling wind passes through the through hole of the wheel 30 through the bottom surface of the vehicle. As a result, a large amount of wear powder drifting inside the wheel 30 flows through the through hole to the wheel 30 surface side, and the surface of the wheel 30 is soiled.

  On the other hand, in the present embodiment, the wind guide body 44 causes the wear powder to flow on the running wind directed toward the inner surface side of the disk rotor 12, so that the wear powder drifts inside the wheel 30 is reduced. The In this way, by introducing a part of the generated wear powder away from the surface of the wheel 30, contamination of the wheel 30 due to the wear powder can be reduced.

  In the case of the arrangement of the caliper 10 and the air guide body 44 described in the present embodiment, when the braking operation is performed when the vehicle moves backward and wear powder is generated, the wear powder is guided to the inside of the disk rotor 12 as described above. I can't. However, the reverse travel is low speed, and it is considered that the wear powder generated at the time of braking operation is extremely small or not generated at all. Therefore, basically, the arrangement of the air guide body 44 is only required to correspond to the forward traveling as shown in the present embodiment, but the caliper 10 is sandwiched so that it can also correspond to the backward traveling as necessary. The wind guide body 44 may be arranged at the front and rear. Also in this case, the effect of guiding the wear powder generated during the reverse travel to the inside of the disk rotor 12 can be obtained, which can contribute to the reduction of the surface contamination of the wheel 30.

  As described above, the air guide body 44 can be easily formed by press working or die forming, and the inclination angle of the back surface portion 46 can be easily adjusted. As a result, it is possible to adjust the direction in which the wear powder is guided in accordance with the vehicle type and the airflow characteristics around the tire, and the versatility as a part can be increased.

  The air guide body 44 may be a small piece having a length along the circumferential direction of the disk rotor 12 of about several centimeters, for example, about 5 cm. Therefore, the floating wear powder is unlikely to accumulate on the shielding surface portion 48. If the air guide body 44 is large, the possibility that wear powder accumulates on the shielding surface 48 increases. The accumulated wear powder may peel off and flow again in the direction of the wheel 30 due to vibration during travel, turbulence in the travel wind, changes in the strength of the travel wind, and the like, and the wheel 30 may be soiled. When the air guide body 44 is a small piece as in the present embodiment, the wear powder can be efficiently guided to the inner surface side of the disk rotor 12 without the above-described accumulation of wear powder. Furthermore, since the air guide body 44 as an accessory is a small piece, it is possible to minimize the influence on the weight reduction of the unsprung load, which is an important design item for the vehicle underbody.

  In the embodiment described above, an example in which the shielding surface portion 48 of the air guide body 44 is a flat surface has been shown. However, as shown in FIG. 6A, a folded portion 54 may be provided toward the caliper 10 side. In this case, it is possible to guide the wear powder flying from the caliper 10 side in the direction of arrow P1 little by little. As a result, it is possible to smoothly and reliably carry the wear powder in the arrow P1 direction.

  Further, as described above, it is desirable to form a turbulent flow on the shielding surface portion 48 side in order to reduce the flying force of the abrasion powder. Therefore, in the present embodiment, as shown in FIG. 6B, a plurality of slits 56 penetrating from the back surface portion 46 side to the shielding surface portion 48 side are provided in the air guide body 44. When the traveling wind passes through the slit 56 from the back surface portion 46 side, air wraps around the shielding surface portion 48 side to form a turbulent flow. As a result, the flying force of the wear powder flying from the caliper 10 side is reduced, and the wear powder is temporarily captured by the generated turbulent flow. As described above, the wear powder temporarily captured is guided in the direction of arrow P1 by the traveling wind flowing in the direction of arrow W1 or the traveling wind that has circulated from the traveling wind inlet 52.

  FIG. 6C shows the same effect by forming the slit 56 similar to FIG. 6B by forming the back surface portion 46 (shielding surface portion 48) of the air guide body 44 in a plurality of stages with a plurality of feathers. obtain.

  Further, as shown in FIG. 6D, by forming a plurality of protrusions 58 on the shielding surface portion 48 side, an air separation region on the shielding surface portion 48 side may be formed to form a turbulent flow. In this case, the back surface portion 46 is a continuous surface on which no slits or the like are formed, so that traveling air can flow smoothly along the back surface portion 46 and can be directed toward the inner surface side of the disk rotor 12.

  By the way, since the air guide body 44 is a small piece as described above, it may be deformed or damaged by an impact. When the mounting posture changes, the friction powder may not be guided in a desired direction. For example, the inside of the wheel 30, for example, the inner surface 40 a of the rim 40 may be icing during winter or snowfall. In such a case, when the ice contacts the air guide body 44, the air guide body 44 is damaged, deformed, or has a poor mounting posture. Therefore, in the present embodiment, when foreign matter such as ice, mud, or stone adheres to the inner surface 40 a of the rim 40, this foreign matter is brought into contact with the foreign matter upstream of the air guide body 44 with respect to the rotation direction of the wheel 30. It has a structure to be removed. The structure to be brought into contact with the foreign matter is highly rigid in the vicinity of the outer periphery of the disk rotor 12 and is fixed to the non-rotating portion of the vehicle on the upstream side in the rotation direction from the air guide body 44, and the distance from the rotation center of the wheel 30 to the tip of the structure However, any structure can be used as long as it is longer than the distance from the rotation center of the wheel 30 to the tip of the air guide body 44. In the case of the present embodiment, the caliper 10 is fixed to the non-rotating portion of the vehicle on the upstream side in the rotation direction from the air guide body 44. Therefore, in the air guide body 44 of this embodiment, as shown in FIG. 7, the outer end portion 44 a of the air guide body 44 in the radial direction of the disk rotor 12 is more than the outer end portion 10 a of the caliper 10 in the radial direction of the disc rotor 12. It arrange | positions so that it may be located in the radial inside diameter side of the disk rotor 12. FIG. That is, the relationship between the distance M from the rotation center axis O of the wheel 30 to the outer end 44a of the air guide body 44 and the distance N from the rotation center axis O of the wheel 30 to the outer end 10a of the caliper 10 is expressed as M < N may be set. In this case, the mounting position of the air guide body 44 may be adjusted, or the protruding shape of the bridge portion 18 a of the caliper 10 may be adjusted with respect to the radially outer side of the disk rotor 12. By doing in this way, the caliper 10 that is always upstream of the air guide body 44 during forward rotation of the wheel 30 eliminates foreign matter adhering to the inner surface 40 a of the wheel 30. As a result, damage to the wind guide body 44 and poor posture can be prevented. In this case, it is possible to avoid an increase in component cost and assembly cost, an increase in unsprung load, and the like without requiring a new additional component for protecting the air guide body 44. In FIG. 7, in order to explain the distance from the rotation center axis O, the caliper 10 and the air guide body 44 are shown along line segments A1 and A2 in FIG. 3A, as in FIG. It is a cross-sectional view.

  In this way, by taking protective measures for the air guide body 44, even if the air guide body 44 is a small piece part, the wear powder is efficiently guided to the inner surface side of the disk rotor 12 and is not discharged to the front surface side of the wheel 30. Can provide structure. In order to eliminate foreign matter, the caliper 10 itself may be used for the structure as described above, or a protrusion may be formed on the caliper 10. Further, a structure may be added to a portion that becomes a fixed body with respect to the wheel 30.

  Further, the shape of the air guide body 44 shown in each drawing is an example, and any shape can be used as long as it can block the flight direction of the wear powder and can form a flow of running wind that guides the wear powder to the inner surface side of the disk rotor 12. It may be changed, and the same effect as this embodiment can be obtained. In this embodiment, the protect cover 42 for fixing the air guide body 44 is fixed to the axle case 32 of the axle suspension type suspension. However, the fixing position of the air guide body 44 and the protect cover 42 can be selected as appropriate. For example, in the case of an independent suspension type suspension, the suspension can be fixed to a fixed portion of the vehicle such as a knuckle. In this case, the same effect as that of the present embodiment can be obtained.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. The configuration shown in each figure is for explaining an example, and any configuration that can achieve the same function can be changed as appropriate, and the same effect can be obtained.

It is sectional drawing which shows the conceptual structure of the caliper of the disc brake apparatus which concerns on this embodiment. It is explanatory drawing explaining the disc brake apparatus of this embodiment, and is sectional drawing which shows the state which mounted | wore the disk brake device. It is explanatory drawing explaining the state which has arrange | positioned the wind guide to the disc brake apparatus of this embodiment, (a) is a figure which shows the positional relationship of the disc brake device and wind guide seen from the wheel mounting side, (b) FIG. 4 is an irregular cross-sectional view taken along line segments A1 and A2 in FIG. It is explanatory drawing explaining the shape of the air guide used for this embodiment, (a) is a perspective view, (b) is a right view of (a), (c) is a top view of an air guide. . It is explanatory drawing explaining the flow of the driving | running | working wind by an air guide used for this embodiment, and an abrasion powder. It is explanatory drawing explaining the other shape of the air guide body used for this embodiment. It is explanatory drawing explaining the distance from the rotation center axis | shaft O of the baffle used for this embodiment.

Explanation of symbols

  10 caliper, 12 disc rotor, 12a side surface, 14 mounting part, 16 friction material, 18 housing part, 18a bridge part, 20 piston, 22 pad back metal, 24 hole, 26 port, 28 claw part, 30 wheel, 32 axle case, 34 axles, 36 hubs, 38 hub bolts, 40 rims, 42 protective covers, 44 air guides, 46 back surface portions, 48 shielding surface portions.

Claims (6)

A disc rotor that rotates with the axle,
A caliper that straddles the disk rotor in the thickness direction and generates a braking force on the disk rotor by pressing a pair of friction materials against the friction sliding surface of the disk rotor;
Wear powder that straddles the disk rotor in a thickness direction at a predetermined distance downstream from the caliper with respect to the forward rotation of the disk rotor and is discharged in the forward direction when the disk rotor and the friction material come into contact with each other. A wind guide that guides the vehicle in a predetermined direction on the traveling wind received during forward traveling,
Including
The wind guide body shields the back surface portion inclined so as to guide the flow direction of the traveling wind toward the inner surface side of the disk rotor in the direction opposite to the forward direction, and the discharge direction of the discharged wear powder. And a shielding surface portion for allowing the vehicle to flow out on the traveling wind flowing along the back surface portion.   The wind guide body moves the wear powder along the shielding surface portion while reducing the flying force of the wear powder by generating a turbulent flow in the shielding surface portion, and travels along the back surface portion. 2. The disc brake device according to claim 1, wherein the disc brake device is caused to flow out on the vehicle.   3. The disc brake device according to claim 1, wherein the air guide body has a slit through which a part of the traveling wind hitting the back surface portion passes.   4. The disc brake device according to claim 1, wherein the air guide body has a plurality of protrusions on the shielding surface portion. 5.   The disc brake device according to any one of claims 1 to 4, wherein the air guide body is formed by curving a plate material.   The air guide body has a radially outer end portion in the radial direction of the disk rotor of the air guide body that is closer to a radially inner diameter side of the disk rotor than a radially outer end portion of the disk rotor of a structure formed inside the wheel. The disc brake device according to any one of claims 1 to 5, wherein the disc brake device is disposed so as to be positioned.

Images