JP2008185143A - Dust cover for disc brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust cover for a disc brake device, having simpler construction suppressing the flying of wear debris while preventing the lowering of braking force due to water or sediment. <P>SOLUTION: The dust cover 20 for the disc brake device 9 comprises a first dust cover member 50 in an approximately annular shape for covering the whole faces of a caliper 12 and a disc rotor 30 inside a vehicle body, and a second dust cover member 60 having no contact with the first dust cover member 50 for covering the faces of the caliper 12 and the disc rotor 30 on the side of a rim 26a and the faces thereof on the side of a disc wheel 26b, the first and second dust cover members shielding the caliper 12 and the disc rotor 30, wherein wear debris discharge suppressing means 80, 62 are provided for suppressing the discharge of wear debris of the disc brake device 9 from a region formed by the first and second dust cover members. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dust cover for a disc brake device, and more particularly to a dust cover for a disc brake device that prevents a reduction in braking force due to intrusion of water, earth and sand, or suppresses scattering of wear powder of the disc brake device.

  A disc brake device that applies a braking force to a wheel by pressing a disc rotor that rotates integrally with the wheel with a brake pad is inherently not good in heat dissipation with a drum brake with high sealing performance and has a braking force in rainy weather. It is a brake device devised to improve the drop. In the disc brake device, the frictional heat generated in the disc rotor during braking is cooled by the rotation of the disc, and the brake pads are not sealed, so heat dissipation is excellent, and even if the disc rotor gets wet, it dries quickly. The braking force is difficult to decrease.

However, even in the disc brake device, if water or earth or sand adheres to the disc rotor or brake pad, the braking force is greatly reduced or becomes unstable. Has been proposed (see, for example, Patent Document 1). In the disc brake device described in Patent Document 1, the disc brake device is supported by the power unit, and the disc brake device is arranged in a swing case that covers the power unit, thereby shielding the disc brake device from the outside.
JP-A-9-203422

  However, the disc brake device described in Patent Document 1 has a complicated structure, resulting in an increase in cost and weight, and is difficult to apply in a structure in which the power source is mounted at a position away from the wheel as in an automobile. There is.

  By the way, the disc brake device is not only exposed to water, earth and sand from the outside, but also disperses wear powder due to friction between the disc rotor and the brake pad during braking. Although this wear powder has a problem that it adheres to a highly designable wheel and impairs its appearance, it has not been considered so far to prevent the wear powder from scattering.

  In view of the above problems, an object of the present invention is to provide a dust cover for a disc brake device that has a simpler structure and prevents a reduction in braking force due to water, earth and sand, etc., and suppresses scattering of wear powder.

  In order to solve the above-described problems, the present invention covers a substantially annular first dust cover member that covers the entire inner surface of the caliper and the disc rotor, and covers the rim side surface and the disc wheel side surface of the caliper and the disc rotor. A dust cover for a disc brake device having a first dust cover member and a non-contact second dust cover member, wherein the disc rotor and caliper are shielded by the first and second dust cover members, It is characterized by having wear powder discharge suppressing means (for example, labyrinth structure 80, filter 62) that suppresses discharge of wear powder of the disc brake device 9 from the region formed by the first and second dust cover members.

  According to the present invention, the disk rotor and the caliper are shielded and the wear powder discharge suppressing means is provided, so that the scattering of the wear powder discharged by the disk brake device can be significantly suppressed.

  Moreover, in one form of this invention, an abrasion powder discharge | emission suppression means is a labyrinth structure which the outer peripheral part of a 1st dust cover member and the edge part inside a vehicle interior of a 2nd dust cover member form, or 1st dust It is a filter formed in at least one of a cover member or a 2nd dust cover member, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, scattering of magic powder can be suppressed, ensuring air circulation with a labyrinth structure, and scattering of magic powder can be suppressed, ensuring air circulation with a filter.

  It is possible to provide a dust cover for a disc brake device that prevents a reduction in braking force due to water, earth and sand, etc., and suppresses scattering of wear powder with a simpler structure.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is an example of a cross-sectional view of a disc brake device 9 and a vehicle wheel 1 to which a dust cover (hereinafter simply referred to as a dust cover) 20 of the disc brake device 9 of the present embodiment is applied. The dust cover 20 covers the disk rotor 30 and the caliper 12 with a dust cover 20 composed of two or more members, thereby shielding from the outside and protecting it from water, earth and sand, etc., and preventing scattering of wear powder.

  The rotation support member 10 includes a disk-shaped flange 27 and a substantially cylindrical shaft portion 22. The shaft portion 22 is formed with a large-diameter portion 22 a provided at a site adjacent to the flange 27 and a small-diameter portion 22 b provided at the end opposite to the flange 27. A connecting portion between the large diameter portion 22a and the small diameter portion 22b of the shaft portion 22 is formed in a tapered shape. The outer peripheral surface of the large diameter portion 22 a is fitted to the inner peripheral surface of the inner race of the bearing 28. Further, the outer peripheral surface of the small diameter portion 22 b is fitted to the inner peripheral surface of the inner race of the bearing 21.

  The wheel hub 23 includes a substantially cylindrical cylindrical portion 23a. The outer peripheral surface of the outer race of the bearing 28 is fitted to the inner peripheral surface of the inner end portion of the cylindrical portion 23a, and the outer peripheral surface of the outer race of the bearing 21 is fitted to the inner peripheral surface of the outer end portion of the vehicle body. ing. Further, the inner peripheral surface of the disc wheel 26b of the wheel 26 is fitted to the outer peripheral surface of the end portion of the cylindrical portion 23a outside the vehicle body. A hub flange 25 is provided integrally with the wheel hub 23 on the outer periphery of the wheel hub 23. A wheel 26 is fixed to the outside of the vehicle body of the hub flange 25 by a hub nut 19. A disk rotor 30 is fixed to the inside of the hub flange 25 by a mounting bolt 24.

  The disk rotor 30 is a disk-shaped steel member, and braking surfaces 15 and 16 are provided on both sides thereof. A caliper 12 is disposed near the periphery of the disk rotor 30 so as to sandwich the braking surfaces 15 and 16 from both sides. The caliper 12 includes a cylinder 11, an arm portion 11 a formed integrally with the cylinder 11, a piston 13, and a pair of pads 14 and 18. The piston 13 is slidably mounted in the cylinder 11 and moves to the right according to the hydraulic pressure supplied to the cylinder 11. The pad 14 is joined to the end surface of the piston 13 and faces the braking surface 15 of the disk rotor 30 with a slight gap.

  The arm portion 11 a extends from the radially outer portion of the disc rotor 30 so as to straddle the peripheral portion of the disc rotor 30, and its end portion faces the braking surface 16 of the disc rotor 30. The pad 18 is joined to the end surface of the arm portion 11a and is opposed to the braking surface 16 of the disk rotor 30 with a slight gap.

  The caliper 12 is supported by a torque plate 17 fixed to the vehicle body at a portion not shown so as to be sandwiched from both sides in the rotational direction of the disk rotor 30. When the hydraulic pressure is applied to the caliper 12, the piston 13 is driven to the right side in the drawing so that the pad 14 comes into contact with the braking surface 15, the cylinder 11 moves in the left direction in the drawing, and the braking surfaces 15, 16 of the disc rotor It is pressed from both sides by the pads 14 and 18. A frictional force generated between the braking surfaces 15 and 16 and the pads 14 and 18 respectively acts as a braking force on the wheel 26. In this case, as described above, the caliper 12 is supported by the torque plate 17 from both sides in the rotational direction of the disk rotor 30, thereby preventing the caliper 12 from rotating together with the disk rotor 30.

  A first dust cover member 50 is disposed inside the caliper 12 in the vehicle body. The first dust cover member 50 is a substantially annular rigid member, and has an axle through hole 50a at the center of the annular shape and is fixed to the axle. The first dust cover member 50 covers the entire inner surface of the vehicle body of the disc rotor 30 including the caliper 12. In the figure, the first dust cover member 50 is a flat plate, but may be provided with unevenness and notches to avoid interference with wheel wheel members such as knuckles and arms.

  A second dust cover member 60 is disposed inside the vehicle body of the wheel 26 and outside the vehicle body of the disc rotor 30. The second dust cover member 60 is an annular thin member having a hemispherical shape, a semi-cylindrical shape in which one end surface of the cylinder is blocked, or a truncated cone shape in which a skirt portion is formed in a cylindrical shape. The second dust cover member 60 is formed so as to cover the entire inner surface of the rim 26 a and the entire surface of the disk wheel 26 b so as to surround the disk rotor 30 and the caliper 12. Covering.

  The cylindrical portion 60 a of the second dust cover member 60 extends to the same extent as the outer periphery of the first dust cover member 50 or slightly to the inside of the vehicle body from the first dust cover member 50, leaving a gap 70. Yes. Therefore, the caliper 12 and the disrotor 30 are accommodated in the region formed by the second dust cover member 60 and the first dust cover member 50. Hereinafter, this region may be referred to as the inside of the dust cover 20.

  By configuring the dust cover 20 with two non-contact members (a first dust cover member 50 and a second dust cover member 60), the second dust cover member 60 that rotates integrally with the wheel 26 can be The inside of the vehicle can be shielded by the first dust cover member 50 that is fixed to avoid the fixing member inside the vehicle body.

  In this way, although air can be circulated, the disk rotor 30 or the pair of brake pads 14 can be used even when water, earth and sand, etc. are caught in the wheel wheel 1 during traveling by almost sealing the particles and liquid from the outside. , 18 can be prevented from adhering to the braking surface, and fluctuations in braking force due to flooding can be prevented. Further, even if wear powder is generated due to friction between the disc rotor and the brake pad during braking, the second dust cover member 60 is located between the caliper 12 and the wheel 26, so that the amount of wear powder attached to the wheel 26 is greatly increased. Can be reduced.

  The distance L of the gap 70 is preferably within 100 [mm] at the longest, and more preferably as narrow as possible so as not to come into contact with vibration during traveling or the like (for example, about 10 [mm]). In particular, in an electric vehicle that uses a regenerative brake, the braking load of the disc brake 9 is greatly reduced, so that the frictional heat generated during braking is also greatly reduced. Is small.

  Before attaching the caliper 12 and the disc rotor 30, the first dust cover member 50 is assembled by inserting the axle through hole 50a into the axle from the outside of the vehicle body and fixed by a predetermined method. The second dust cover member 60 is inserted into the outer peripheral side of the cylindrical portion 23 a of the wheel hub 23 in a state where the wheel 26 is not mounted, and the wheel hub 23 together with the wheel 26 is formed by the hub nut 19. Secure to. In addition, how to attach is an example and can be suitably changed according to the form of the wheel 1.

  A modification of the dust cover 20 of the disc brake device 9 will be described. FIG. 2A shows a modification of the first dust cover member 50 and the second dust cover member 60. In FIG. 1, the outer periphery of the first dust cover member 50 and the outer periphery of the second dust cover member 60 (end portions of the cylindrical portion 60a) are simply flat plates, but in FIG. The outer periphery of the member 50 and the end of the cylindrical portion 60a form a labyrinth structure 80. The end portion of the cylindrical portion 60a is bent by about 90 degrees radially inward of the disk rotor 30, and the second bent portion is bent by about 90 degrees on the outer side of the vehicle body from the first folded portion 80a. The first folded portion 80a, the second folded portion 80b, and the end portion 80c, which are two folded portions, form a convex recess 80d on the inner side of the vehicle body.

  Further, the outer periphery of the first dust cover member 50 is bent approximately 90 degrees toward the inside of the vehicle body, the front end 80e of the outer periphery is located at least inside the vehicle body from the end portion 80c, and the second dust cover member 60 is formed in a non-contact manner.

  By forming the labyrinth structure 80 in the gap 70 in this way, the gap 70 disappears when the first dust cover member 50 and the second dust cover member 60 are viewed from the axle direction. Powder scattering can be reduced more effectively.

  Note that the labyrinth structure 80 in FIG. 2A is merely an example, as long as the cumulative angle change is about 180 degrees or more in the shortest path through which particles and water droplets pass (FIG. 2A). In this case, particles and water droplets entering from the X direction pass through the labyrinth structure 80, and thus undergo a cumulative angle change of θa + θb + θc = 270). Accordingly, the first folded portion 80a and the like do not necessarily have to be configured at approximately 90 degrees, and may be formed by a curved portion such as a spiral.

  FIG. 2B shows a modification of the first dust cover member 50. The first dust cover member 50 in FIG. 2B is different from FIG. 1 in that it has a duct 51 for taking in air. The duct 51 is a pipe for circulating air, and one end of the duct 51 is opened forward of the vehicle, and the other end is connected to a hole provided in the first dust cover member 50.

  The opening 51a of the duct 51 has a tubular shaft facing the front of the vehicle. In FIG. 2B, the inside and outside of the dust cover 20 communicate with each other by the gap 70. However, when the vehicle is traveling, air is more actively taken in by the duct 51 and guided to the caliper 12 and the disk rotor 30. it can. By taking air into the caliper 12 and the disk rotor 30, it is possible to radiate the frictional heat well even in the case of running on a slope with many braking opportunities or running with repeated acceleration / deceleration.

  Even if the duct 51 is open so as to take in air, the opening faces the front of the vehicle and the opening is sufficiently small (for example, a diameter of about 70 gaps), so that intrusion of water, earth and sand, etc. is reduced. In addition, since the duct 51 is an air inlet, the wear powder is very rarely scattered from the duct 51. In addition, while forming the duct 51 in the 1st dust cover member 50, you may form the labyrinth structure 80 in the gap | interval 70 like Fig.2 (a).

  FIG. 2C shows a modification of the second dust cover member 60. The second dust cover member 60 in FIG. 2C is provided with a filter 62 in a through hole 61 provided in a part thereof. The filter 62 has a mesh structure enough to capture wear powder, and is, for example, glass wool, non-woven fabric, felt, or the like. In FIG. 2C, the through hole 61 and the filter 62 are provided in a plane parallel to the disk rotor 30, but they may be provided in the cylindrical portion 60a, or may be provided in two or more places.

By providing the through hole 61, an air outlet through which the air inside the dust cover 20 flows out is formed. Therefore, the air easily flows in from the gap 70, and it is possible to perform hill running and acceleration / deceleration with many braking opportunities. Heat dissipation can be maintained even when traveling repeatedly. Moreover, since the filter 62 is attached to the through hole 61, even if air flows out from the through hole 61, the abrasion powder is captured by the filter 62, and both heat dissipation and reduction of the amount of scattering can be achieved. Since water and earth and sand are larger in size than wear powder, it is difficult for the water and earth and sand to be captured by the filter 62 and enter the through hole 61.
Further, the dust cover 20 may be configured by the second dust cover member 60 in FIG. 2C and the first dust cover member 50 having the duct 51 in FIG. With such a structure, an air inflow path can be secured by forming an air inflow port by the duct 51 and an air outflow port by the through hole 61, so that the heat dissipation of the disk rotor 30 and the caliper 12 is increased. be able to. Furthermore, a labyrinth structure 80 may be formed in the gap 70 in addition to the through hole 61, the filter 62, and the duct 51.

  FIG. 3 is a graph showing an example of the effect of the dust cover 20 of FIG. In FIG. 3, the amount of change in the friction coefficient μ of the brake pad at the time of getting wet, such as running on rainy weather, is compared with the case where the dust cover 20 of the present embodiment is present and not. If the dust cover 20 is not provided, the friction coefficient μ can be changed by about 0.23 due to water. On the other hand, if the dust cover 20 is provided, the friction coefficient μ is changed only by about 0.05. That is, it was confirmed that the fluctuation of the braking torque can be greatly reduced by the dust cover 20 of the present embodiment.

  As described above, according to the dust cover 20 of the present embodiment, it is possible to prevent a reduction in braking force due to water, earth and sand, etc. with a simple structure and to suppress the scattering of wear powder.

It is an example of a sectional view of a disc brake device and a vehicle wheel to which a dust cover is applied. It is a figure which shows the modification of the dust cover of a disc brake apparatus. An example of the effect by a dust cover is shown in a graph.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheel wheel 9 Disc brake apparatus 10 Rotation support member 20 Dust cover 30 Disc rotor 50 1st dust cover member 60 2nd dust cover member 61 Through-hole 62 Filter 70 Gap 80 Labyrinth structure

Claims (2)

A substantially annular first dust cover member covering the entire inner surface of the caliper and the disk rotor;
A first dust cover member and a non-contact second dust cover member that cover the rim side surface and the disk wheel side surface of the caliper and the disc rotor;
A dust cover for a disc brake device that shields the disc rotor and caliper by first and second dust cover members,
Abrasion powder discharge suppression means for suppressing the discharge of wear powder of the disc brake device from the region formed by the first and second dust cover members,
A dust cover for a disc brake device, comprising: The wear powder discharge suppressing means is
It is formed in at least one of the labyrinth structure formed by the outer periphery of the first dust cover member and the inner end of the second dust cover member, or the first dust cover member or the second dust cover member. Filters,
The dust cover of the disc brake device according to claim 1, wherein

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