JP2012036995A - Brake disc rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of achieving both the security of a thermal characteristic and weight reduction required for a brake disc rotor.SOLUTION: In certain embodiments, the brake disc rotor 20 cools a disc by sending air between two circular discs which rotate together with a wheel and are opposed to each other. A zeolite 44 is disposed between the two oppositely arranged discs. Consequently, the thermal characteristic required for the brake disc rotor is secured.

Description

  The present invention relates to a brake disc rotor used in a brake device.

  Conventionally, a heat pump using an adsorbent such as zeolite as a heat storage material has been devised (for example, see Patent Document 1). In addition, a vehicle heat storage heater has been devised that is provided with a heat exchanger using zeolite that stores thermal energy of engine exhaust gas and dissipates heat to air for heating the passenger compartment when the engine is started (see, for example, Patent Document 2). Patent Document 3 discloses a zeolite molding method in which a zeolite kneaded composition is molded by stirring granulation.

  On the other hand, there is a disc brake device as one of braking devices for braking the vehicle. This disc brake device generates a braking force by pressing a pair of brake pads, which are disposed opposite to the friction sliding surfaces on both sides of a disc rotor that rotates together with the wheels, against the friction sliding surfaces.

Japanese Patent Laid-Open No. 61-1933 Japanese Patent Laid-Open No. 61-263824 JP 2000-128523 A

  Since the disc brake device releases kinetic energy as heat, it is desirable that the disc rotor has a large heat capacity in order to exhibit stable braking performance during continuous braking. Therefore, the higher the running performance of the vehicle, the higher the required braking performance, leading to an increase in the diameter and volume of the disk rotor.

  As a material for the disk rotor, gray cast iron having excellent friction characteristics is generally used. However, since gray cast iron has a relatively small specific heat, the mass of the disk rotor increases when it is attempted to secure a heat capacity in consideration of braking performance.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technology capable of ensuring both thermal characteristics required for a brake disc rotor and weight reduction.

  In order to solve the above-described problems, a brake disk rotor according to an aspect of the present invention has two disk-shaped disks that rotate together with a wheel, face each other at a predetermined interval, and send air between the two disks. A brake disc rotor that cools a disc, and zeolite is disposed between the two discs arranged to face each other.

  According to this aspect, the zeolite functions as a heat absorbing / dissipating member that absorbs heat during braking and dissipates heat during non-braking. Therefore, the thermal load of the disk rotor can be made uniform, the thermal characteristics required of the disk rotor can be ensured, and the heat capacity of the disk rotor can be reduced, and the weight can be reduced.

  According to the present invention, it is possible to achieve both the thermal characteristics required for the brake disc rotor and the weight reduction.

It is a conceptual lineblock diagram of a disc brake device concerning this embodiment. It is the front view which fractured | ruptured a part of ventilated disc rotor seen from the A direction of FIG. 1, and exposed the inside. It is a fragmentary sectional view of the disc rotor concerning a 2nd embodiment. It is a schematic diagram for demonstrating the accommodation method to the disk rotor of the zeolite which concerns on the modification of 2nd Embodiment, and a zeolite. It is the figure which showed typically the modification of the unit which enclosed zeolite in the metal net | network beforehand. It is a schematic diagram for demonstrating the accommodation method to the disk rotor of the zeolite which concerns on 3rd Embodiment, and a zeolite. FIG. 7A is a perspective view of the zeolite plate according to the fourth embodiment, FIG. 7B is a side view of the zeolite plate of FIG. 7A viewed from the C direction, and FIG. These are perspective views of the zeolite concerning a 4th embodiment. FIG. 8A is a perspective view of a zeolite plate according to a modification of the fourth embodiment, FIG. 8B is a side view of the zeolite plate of FIG. (C) is a perspective view of the zeolite which concerns on the modification of 4th Embodiment. It is a perspective view which shows schematic structure of the zeolite which concerns on 5th Embodiment. It is a perspective view of schematic structure of the zeolite concerning the modification of a 5th embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate.

(First embodiment)
FIG. 1 is a conceptual configuration diagram of a disc brake device 10 according to the present embodiment. FIG. 2 is a front view in which a part of the ventilated disc rotor is viewed from the direction A in FIG.

  The disc brake device 10 is configured as a so-called floating caliper, and includes a caliper 12 that is slidably supported by a mounting (not shown) fixed to a non-rotating member of a vehicle. The caliper 12 includes a cylinder portion 18 having a wheel cylinder 14 and a piston 16 therein, and a cylinder portion 18 extending from the cylinder portion 18 and a ventilated disk rotor (hereinafter referred to as “disk rotor”) 20 therebetween. Opposite claw portions 22 (corresponding to “support portions”).

  Between the cylinder portion 18 and the claw portion 22, an inner pad 24 and an outer pad 26 are disposed to face each other with a disc rotor 20 that rotates coaxially with the wheel. On the side of the inner pad 24 and the outer pad 26 that do not face the disc rotor 20, back metal 28 and 30 are attached, respectively. The back metal 28 is supported on the inner side of the disk rotor 20 so as to be slidable in the axial direction of the disk rotor 20 by mounting. Further, the back metal 30 is supported on the outer side of the disk rotor 20 so as to be slidable in the axial direction of the disk rotor 20 by mounting. In the present embodiment, the back metal 28 and the inner pad 24 may be collectively referred to as an inner brake pad, and the back metal 30 and the outer pad 26 may be collectively referred to as an outer brake pad. Further, the inner brake pad and the outer brake pad may be simply referred to as a brake pad.

  A piston 16 is disposed on the back of the back metal 28. When the piston 16 is operated to push the back metal 28, the inner pad 24 is pressed against the friction sliding surface 32 on the inner side of the disk rotor 20. On the other hand, a pair of claw portions 22 are disposed on the back portion of the back metal 30. When the claw portion 22 moves relatively and pushes the back metal 30, the outer pad 26 is pressed against the friction sliding surface 34 on the outer side of the disk rotor 20.

  The piston 16 has a pressing surface for pressing the back side of the back metal 28. A pressing surface for pressing the back side of the back metal 30 is formed at the tip of the claw portion 22. When a master cylinder (not shown) or the like is operated and hydraulic pressure is supplied into the wheel cylinder 14, the piston 16 protrudes toward the disc rotor 20. As a result, the inner pad 24 is pressed against the inner side of the disk rotor 20 and the reaction force causes the caliper 12 to move in a direction opposite to the direction in which the piston 16 protrudes. It is pressed against the outer side of the rotor 20. As a result, the disc rotor 20 is clamped by the inner pad 24 and the outer pad 26, and the wheel is braked.

  Next, the disk rotor 20 will be described in detail. As shown in FIGS. 1 and 2, the disk rotor 20 includes an outer disk 38 attached to an outer peripheral end of a hub 36 to which a wheel is attached, and an inner disk 40 arranged to face the outer disk 38. . A tire wheel 39 is fastened to the hub 36 by a bolt (not shown) inserted into the hub hole 37. The outer disk 38 and the inner disk 40 are donut-shaped discs, and a plurality of fins 42 are arranged at predetermined intervals in the circumferential direction therebetween. By sandwiching the fins 42, the outer disk 38 and the inner disk 40 can maintain a posture in which they face each other at a predetermined interval.

  In the present embodiment, when it is not necessary to distinguish between the outer disk 38 and the inner disk 40, the outer disk 38 and the inner disk 40 may be simply referred to as a disk. Further, in FIG. 2, as an example of the fin 42, a linear type fin arranged radially from the inner circumference side to the outer circumference side of the disk is shown, but arranged in a spiral shape from the inner circumference side to the outer circumference side of the disk. It may be a curved type fin.

  The outer disc 38 and the inner disc 40 of the disc rotor 20 are pressed and clamped by the inner pad 24 and the outer pad 26 in the disc brake device 10 described above to be braked. During braking, the entire disk rotor 20 is heated by frictional heat generated by the contact between the outer disk 38 and the outer pad 26 and frictional heat generated by the contact between the inner disk 40 and the inner pad 24. The disk rotor 20 obtains an air-cooling effect by flowing air through a plurality of air passages formed between adjacent fins 42 in order to lower the disk temperature raised by this friction.

  The disk rotor 20 is restrained from an overall temperature rise by such an air cooling effect, and a desired braking performance is maintained. However, further improvement in braking performance has been demanded due to recent high performance of vehicles. Therefore, in this embodiment, zeolite 44, which is a kind of silicate, is disposed as an endothermic member between adjacent fins 42 in order to suppress an increase in the temperature of the disk rotor 20 that affects the braking performance.

  The zeolite 44 can adsorb and release moisture in the micropores. Therefore, when the disc brake device 10 is actuated to perform braking and the temperature of the sliding portion of the disc rotor 20 rises, the zeolite 44 releases the adsorbed moisture while the hot disc rotor 20 Heat can be absorbed (regeneration process). On the other hand, after the disk rotor 20 is cooled to a low temperature, the zeolite 44 can release the accumulated heat while adsorbing moisture in the atmosphere (adsorption process).

  For example, the endothermic amount of the zeolite 44 disposed in the disk rotor 20 for two wheels is roughly the thermal energy generated when braking is performed until a 1800 kg vehicle traveling at 120 km / h is stopped. Can be absorbed. Therefore, the heat at the time of braking is efficiently absorbed and dissipated without significantly increasing the mass of the disk rotor 20 as compared with cooling by only air passing between adjacent fins.

  As described above, the zeolite 44 functions as a heat absorbing / dissipating member that absorbs heat during braking and dissipates heat during non-braking, so that the thermal load of the disk rotor 20 can be made uniform, and the heat capacity of the disk rotor 20 can be reduced, and hence lighter. Can be achieved.

  Further, since the zeolite 44 generates heat due to the adsorption of moisture, the moisture on the surface of the disk rotor 20 can be evaporated by heating the disk rotor 20 particularly in rainy weather. As a result, braking stability during rainy weather is also ensured.

(Second Embodiment)
The aforementioned zeolite has various forms and sizes. This embodiment is particularly effective when the above-mentioned zeolite is processed into a granular form. FIG. 3 is a partial cross-sectional view of the disk rotor 50 according to the second embodiment.

  The zeolite 44 according to the present embodiment is a granular material processed to have an average particle diameter of about 2 to 5 mm, and many spaces are filled between the outer disk 38 and the inner disk 40. At this time, metal nets 46 and 48 having meshes to the extent that the granular zeolite 44 does not slip through and drop off are attached to the outer and inner circumferential sides of the space filled with the zeolite 44 in an annular or circular arc shape. The metal nets 46 and 48 are fixed to the two disks of the disk rotor 20 by screws or welding.

  Thus, by making the holes of the metal nets 46 and 48 smaller than the particle size of the zeolite 44, the zeolite 44 is held between the metal nets 46 and 48 and detached from the disk rotor 20 by centrifugal force or vibration. Is suppressed. In addition, since air can flow through the gap between the zeolite 44 and the metal nets 46 and 48, moisture is adsorbed and released efficiently.

  The metal nets 46 and 48 are preferably made of stainless steel in terms of corrosion resistance because the retained zeolite 44 absorbs and discharges water. However, since the thermal conductivity of stainless steel is about 1/4 of that of iron, in order to efficiently absorb the heat generated in the disk rotor 20 to the zeolite 44, the rotation direction of the metal nets 46 and 48 (see FIG. 3). (B direction) is preferably in contact with the outer disk 38 and the inner disk 40. Except for the problem of corrosion, copper having high thermal conductivity is more preferable as the material of the metal net.

  As an example of the manufacturing method of the disk rotor 50 in which the zeolite 44 is held by the metal nets 46 and 48 as described above, after first welding one of the metal nets 46 and 48 to the disk rotor 50 and filling the zeolite 44, A method of welding the other of the metal nets 46 and 48 to the disk rotor 50 is mentioned.

  FIG. 4 is a schematic diagram for explaining a method of accommodating zeolite and zeolite in a disc rotor according to a modification of the second embodiment. FIG. 5 is a diagram schematically showing a modification of a unit in which zeolite is previously enclosed in a metal net.

  As shown in FIG. 4, a unit 54 in which granular zeolite 44 is enclosed in an arc-shaped metal net 52 in advance for manufacturing efficiency is made, and the unit 54 is inserted between adjacent fins 42 and fixed. Also good. In this case, as shown in FIG. 5, a plate-like net 56 may be inserted inside the metal net 52 in order to improve heat transfer to the zeolite 44.

  As mentioned above, the zeolite adsorbs and releases water vapor through the metal network. For example, during rotation without braking, water vapor is obtained from the atmosphere and generates heat. On the other hand, when rotation is reduced or stopped during braking, the heat of the disk rotor 20 is stored and water vapor is released.

(Third embodiment)
FIG. 6 is a schematic diagram for explaining a method of accommodating the zeolite and the zeolite in the disk rotor according to the third embodiment.

  The zeolite 58 according to the present embodiment is molded into a shape in which a ring is cut out in a fan shape in accordance with the same shape as the space between adjacent fins 42. The molded zeolite 58 is provided with a plurality of thin open holes 60. In addition, the number of the holes 60 shown in FIG. 6 is an exemplification, and a larger number is preferable from the viewpoint of securing an air passage.

  The disk rotor 62 according to the present embodiment is provided with a metal net 63 for fixing the zeolite 58 to the disk rotor 62 in order to prevent the zeolite 58 from falling off at the outer periphery thereof. Instead of the metal net 63, a protrusion that prevents the zeolite 58 from falling off by engaging with the zeolite 58 may be provided. Also by the configuration of the disk rotor 62 according to the present embodiment, the same operational effects as those of the above-described embodiments can be obtained.

(Fourth embodiment)
The disc rotor according to the present embodiment has a zeolite obtained by stacking zeolite plates formed into a plate shape. FIG. 7A is a perspective view of the zeolite plate according to the fourth embodiment, FIG. 7B is a side view of the zeolite plate of FIG. 7A viewed from the C direction, and FIG. These are perspective views of the zeolite concerning a 4th embodiment.

  A zeolite 64 shown in FIG. 7 (c) is obtained by laminating a plurality of zeolite plates 66 (see FIG. 7 (a)) having a shape obtained by cutting a ring into a fan shape. As shown in FIG. 7B, the zeolite plate 66 is provided with convex portions 68 that are parallel to the radial direction at both ends in the circumferential direction. Therefore, when the zeolite plate 66 is laminated to form the zeolite 64, the zeolite plates 66 are not in close contact with each other by the two convex portions 68, and a space is formed between the adjacent zeolite plates 66. Therefore, air can flow through the space, and moisture can be adsorbed and released efficiently.

  FIG. 8A is a perspective view of a zeolite plate according to a modification of the fourth embodiment, FIG. 8B is a side view of the zeolite plate of FIG. (C) is a perspective view of the zeolite which concerns on the modification of 4th Embodiment.

  A zeolite 70 shown in FIG. 8 (c) is obtained by laminating a plurality of zeolite plates 72 (see FIG. 8 (a)) having a shape obtained by cutting a ring into a fan shape. As shown in FIG. 8 (b), the zeolite plate 72 is linearly provided with convex portions 74 parallel to the radial direction on the front side and the back side of both ends in the circumferential direction. Therefore, when the zeolite plate 72 is laminated to form the zeolite 70, the zeolite plates 72 are not in close contact with each other by the four convex portions 74, and a space is formed between the adjacent zeolite plates 72. Therefore, air can flow through the space, and moisture can be adsorbed and released efficiently.

  A convex portion or a metal net may be provided on the outer peripheral portion of the disc rotor so that the above-described zeolite 64 and zeolite 70 do not fall off from the disc rotor. In addition, although the zeolite mentioned above has laminated | stacked the zeolite board in the axial direction of a disk rotor, you may laminate | stack in the circumferential direction of a disk rotor. Also by the disk rotor provided with the zeolite according to the present embodiment, the same effects as those of the above-described embodiments can be obtained.

(Fifth embodiment)
FIG. 9 is a perspective view showing a schematic configuration of the zeolite according to the fifth embodiment. The zeolite 76 shown in FIG. 9 is processed into a shape in which a ring is cut out in a fan shape in a state where the filamentous zeolite is entangled. Since such a zeolite 76 has a gap between the adjacent filamentous zeolite, air can flow through the gap, and moisture can be adsorbed and released efficiently.

  FIG. 10 is a perspective view of a schematic configuration of zeolite according to a modification of the fifth embodiment. The zeolite 78 shown in FIG. 10 has a honeycomb structure and is processed into a shape obtained by cutting a ring into a fan shape. In the honeycomb structure, passages are formed in the radial direction. In such zeolite 78, air can flow through the through holes of the honeycomb structure, and moisture can be adsorbed and released efficiently.

  A convex portion or a metal net may be provided on the outer peripheral portion of the disc rotor so that the above-described zeolite 76 and zeolite 78 do not fall off from the disc rotor. Also by the disk rotor provided with the zeolite according to the present embodiment, the same effects as those of the above-described embodiments can be obtained.

  As described above, the present invention has been described with reference to the above-described embodiments. However, the present invention is not limited to the above-described embodiments, and the configurations of the embodiments are appropriately combined or replaced. Those are also included in the present invention. Further, it is possible to appropriately change the combination and processing order in each embodiment based on the knowledge of those skilled in the art and to add various modifications such as various design changes to each embodiment. Embodiments to which is added can also be included in the scope of the present invention.

  10 disc brake device, 12 caliper, 14 wheel cylinder, 16 piston, 18 cylinder part, 20 disc rotor, 24 inner pad, 26 outer pad, 38 outer disc, 39 tire wheel, 40 inner disc, 42 fin, 44 zeolite, 46 metal network.

Claims (1)

A brake disk rotor that cools a disk by causing two disk-shaped disks that rotate together with wheels to face each other at a predetermined interval and sending air between the two disks,
A brake disk rotor, wherein zeolite is disposed between the two disks disposed to face each other.

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