JP2006125553A - Disc rotor cooling structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc rotor cooling structure having good performance of cooling an inner hat type disc rotor with a draft hole formed in the outer peripheral portion on the outside of a vehicle without giving influences to the strength of a hat portion. <P>SOLUTION: The structure comprises the inner hat type disc rotor formed as a sectionally hat shaped annular member consisting of the outer peripheral portion, the hat portion and a mounting portion and having the draft hole in the outer peripheral portion on the outside of the vehicle and a guide hole in the hat portion in opposition to the draft hole in the radial direction, and a wheel structural member arranged on the radial inside of the hat portion of the disc rotor and having an approximately cylindrical peripheral wall portion extending from the inside of the outer peripheral portion of the disc rotor close to at least the draft hole of the disc rotor in the inward/outward direction of the vehicle. Between the peripheral wall portion of the vehicle structural member and the hat portion of the disc rotor, a guide portion is provided for guiding air introduced from the front side of the vehicle toward the guide hole and for guiding it to the radial outside of the draft hole via the guide hole. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooling structure for an inner hat type disk rotor.

  Conventionally, in a baffle plate made of a thin disc that covers the entire surface facing the wheel house of the brake rotor, a part of the baffle plate is cut out and bent to form an inclined plate part together with a cooling air inlet. A technique is known that allows the air inside the vehicle to be introduced into the ventilation hole of the disk rotor through the cooling air inlet by bringing the tip of the inclined plate part close to the cylindrical part (hat part) of the disk rotor. (For example, refer to Patent Document 1).

  In addition, the brake dust cover that covers the entire inside of the disc rotor to prevent intrusion of dust and foreign matter from the inside of the vehicle has an air guide opening that opens in the vehicle traveling direction, and the disc rotor through the air guide port In addition, a technique for taking in brake cooling air from the outside is known (for example, see Patent Document 2).

Furthermore, a ventilated disk in which an inner disk and an outer disk are connected via a rib is known (for example, see Patent Document 3). An air guide hole communicating with the vent hole is provided in the vicinity of the hat portion of the outer disk. Further, a fin connected to the outer disk is erected on the outer peripheral surface of the hat portion, and the fin is disposed between the openings of the air guide holes.
JP-A-8-020318 JP-A-9-126255 JP-A-8-74899

  By the way, in the disk rotor of the hat-shaped cross section in which the ventilation holes (fins) are formed on the vehicle inner side of the outer peripheral portion as in the prior art, since all the ventilation holes have openings on the vehicle inner side of the disk rotor, Cooling air can be supplied to the ventilation holes relatively easily from the space inside the vehicle.

  On the other hand, in a disk rotor having a hat-shaped cross section (so-called inner-hat type disk rotor) in which ventilation holes (fins) are formed on the vehicle outer side of the outer peripheral portion, the opening inside the ventilation holes in the radial direction is a hat. Since it is separated from the space inside the vehicle by the portion, in order to send air from the space inside the vehicle to the ventilation hole, it is necessary to form a ventilation hole in the hat portion. However, due to demands on the strength of the hat portion, it is not possible to set the air guide holes for all the air holes (fins) (typically, only about half of the total number of air holes can be set). Therefore, this type of disk rotor has left a problem from the viewpoint of cooling performance.

  Further, in the ventilated disk shown in Patent Document 3, when the disk rotor is rotated by the standing fin, the cooling air flow is disturbed (turbulent flow) in the vicinity of the inlet of the ventilation hole, and the ventilation hole The amount of cooling air flowing into the disk rotor may decrease, and the cooling performance of the disk rotor may be reduced.

  Therefore, the present invention provides a cooling structure that achieves good cooling performance without affecting the strength of the hat portion in an inner hat type disk rotor of the type in which ventilation holes are formed outside the vehicle at the outer peripheral portion. For the purpose.

In order to solve the above problems, according to one aspect of the present invention, the annular member has a hat-shaped cross section including an outer peripheral portion, a hat portion, and an attachment portion, and a ventilation hole is formed on the vehicle outer side of the outer peripheral portion. An inner hat type disk rotor in which air guide holes that are radially opposed to the air holes are formed in the hat portion;
A substantially cylindrical peripheral wall portion that is disposed radially inward of the hat portion of the disk rotor and extends inwardly and outwardly from the outer periphery of the disk rotor to at least the vicinity of the ventilation hole of the disk rotor in a vehicle inner / outer direction. A wheel component member,
Between the peripheral wall portion of the wheel component member and the hat portion of the disk rotor, air introduced from the front side of the vehicle is guided toward the air guide hole and directed to the vent hole through the air guide hole. A cooling structure for a disk rotor is provided, characterized in that a guide portion that guides radially outward is provided.

  In this aspect, the guide part includes an enlarged diameter part formed on a peripheral wall part of the wheel constituent member, and the enlarged diameter part is set on the vehicle inner side than the outer peripheral part of the disc rotor. Good. The guide portion includes a resistance portion formed on the outer side of the vehicle with respect to the ventilation hole in the hat portion of the disk rotor, and the resistance portion inhibits air flow toward the outside of the vehicle with respect to the ventilation hole. It may be.

  In order to solve the above-described problem, according to one aspect of the present invention, a pair of annular sliding plates arranged in parallel on the inner side and the outer side apart from each other in the axle direction, and the pair of annular sliding plates, A plurality of fins extending radially in the radial direction of the annular sliding plate and defining a vent hole between the pair of annular sliding plates, and an annular sliding on the inner side And a hat portion formed integrally with the plate and having a plurality of air guide holes along the outer peripheral surface, wherein the fin is a ring of the annular sliding plate on the outer side. A disc rotor is provided that extends from a position on a radial extension.

  In this aspect, the inlet cross-sectional area of the ventilation hole located on the inner circumferential side of the annular sliding plate is smaller than the outlet sectional area of the ventilation hole located on the outer circumferential side of the annular sliding plate. preferable. Moreover, it is preferable that the said air introduction hole is formed in the inlet part vicinity of the said hat part side of the said ventilation hole.

  According to the present invention, a cooling structure that achieves good cooling performance without affecting the strength of a hat portion in an inner hat type disk rotor of a type in which ventilation holes are formed on the vehicle outer side of the outer peripheral portion is obtained. Can do.

(First embodiment)
The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 to 3 are views showing a first embodiment of the present invention. FIG. 1 is a plan view of a disc rotor 50 according to the first embodiment of the present invention (the upper side of the figure corresponds to the upper side of the vehicle, and the right side of the figure corresponds to the front side of the vehicle). It is sectional drawing of a wheel component (the upper side of a figure respond | corresponds to the vehicle front, and the right side of a figure corresponds to the vehicle outer side). In the present specification (including claims), “vehicle inside” and “vehicle outside” are directions along the vehicle width direction with the vehicle center side inside.

  As shown in FIG. 2, the wheel is held by the hub 2, and the disc rotor 50 of the brake device 30 that rotates together with the wheel is fixed to the hub 2. A knuckle 40 is rotatably connected to the hub 2 via a bearing 3.

  As shown in FIG. 2, the knuckle 40 has a cylindrical peripheral wall portion 42 fitted to the outer peripheral surface 5 a of the outer race 5 of the bearing 3. On the outer peripheral surface 5 a of the outer race 5 of the bearing 3, a flange portion 5 b that abuts the vehicle outer end surface of the knuckle 40 is erected. The knuckle 40 includes a plurality of arm portions (not shown) extending radially outward from the center thereof, and attachment portions such as suspension arms and tie rods are set on the arm portions. In addition to being supported by the vehicle body via the suspension arm, it is connected to the steering mechanism. A mounting 34 of the brake device 30 is fixed to the knuckle 40. The mounting 34 supports components of the brake device 30 (such as the brake pad 35 and the caliper 36).

  The disk rotor 50 is held and fixed between the wheel 1 and the hub 2 by, for example, a hub bolt (not shown). An inner pad 35a and an outer pad 35b of a brake device (disc brake) 30 are disposed in the disc rotor 50 so as to be sandwiched from the inside and outside of the vehicle. A hydraulic pressure generator (not shown) communicates with the cylinder of the caliper 36 via a hydraulic pressure passage. When the high-pressure fluid is supplied to the caliper 36, the inner pad 35a and the outer pad 35b are crimped by the action of the piston and the claw portion of the caliper 36 so as to sandwich both the crimping surfaces of the outer peripheral portion of the disc rotor 50, and the brake operation is performed. Realized.

  The disk rotor 50 according to the present embodiment is an annular member having a hat-shaped cross section including an outer peripheral portion 52, a hat portion 54, and an attachment portion 56. As shown in FIG. 2, the outer peripheral portion 52 of the disc rotor 50 is offset to the vehicle inner side with respect to the attachment portion 56 by a hat portion 54. The disc rotor 50 is a ventilated disc rotor, and is suitable for dissipating frictional heat generated by brake operation on the outer peripheral portion 52 of the disc rotor 50 as shown in FIG. Fins 52b are formed in the radial direction. As a result, cooling air flows from the radially inner side to the outer side of the disk rotor 50 by the action of centrifugal force in the ventilation holes 52a defined between the fins 52b, and the cooling action of the disk rotor 50 is realized.

  In this embodiment, as shown in FIG. 2, the ventilation holes 52a (fins 52b) are set on the vehicle outer side of the outer peripheral portion 52 of the disc rotor 50, and the radial inner side of the ventilation holes 52a is the space inside the vehicle. There is no direct opening. For this reason, an air guide hole 58 is formed in the hat portion 54 so as to face the opening of the vent hole 52a. Since the air guide holes 58 have a negative effect on the strength of the hat portion 54, the air guide holes 58 do not have to be set individually for all the air holes 52a. In the example shown in FIG. 1, half of the ventilation holes 58 are set with respect to the total number of ventilation holes 52.

  By the way, this type of disk rotor 50 (inner hat type disk rotor) has an advantage that the amount of thermal deformation can be reduced as compared with the type of disk rotor in which the ventilation hole is located outside the vehicle. The inner side in the radial direction of 52a does not open directly into the space inside the vehicle, and the number of set air guide holes 58 is limited due to the strength problem of the hat portion 54, so that necessary cooling performance is ensured. It becomes difficult to do.

  Therefore, in the present embodiment, as described in detail below, by setting the guide portion 60 that guides the air introduced from the inside of the vehicle to flow to the ventilation hole 52a via the air guide hole 58 toward the radially outer side. This makes it possible to efficiently increase the cooling performance.

  As shown in FIG. 2, the guide part 60 includes an enlarged diameter part 62 provided on the peripheral wall part 42 of the knuckle 40 and a resistance part 64 provided on the hat part 54 of the disk rotor 50. As a result, as shown by arrows in FIG. 2, the air (cooling air) introduced from the inside of the vehicle is efficiently guided toward the air guide hole 58 due to the presence of the enlarged diameter portion 62, and then the air guide The presence of the resistance portion 64 on the vehicle outer side than the hole 58 increases the wind pressure in the vicinity of the air guide hole 58, so that the air guide is efficiently guided to the air guide hole 58. That is, as shown by an arrow in FIG. 2, the air introduced from the front side of the vehicle (front in the vehicle traveling direction) is efficiently collected by the enlarged diameter portion 62 and guided to the vicinity of the resistance portion 64, and then the resistance It is guided to the outside in the radial direction and the front side of the vehicle through the air guide hole 58 toward the opening of the ventilation hole 52a through a path that turns back due to the presence of the portion 64.

  As shown in FIG. 2, the enlarged diameter portion 62 may be formed integrally with the knuckle 40 in such a manner that the peripheral wall portion 42 of the knuckle 40 is thickened. In FIG. 2, in order to make the meaning of “expanding diameter” easier to understand, a normal portion of the wall with respect to the peripheral wall portion 42 is indicated by hatching. The diameter-expanded portion 62 shown in FIG. 2 extends from the flange portion 5b of the outer race 5 of the bearing 3 toward the vehicle inner side to a position on the vehicle inner side than the outer peripheral portion 52 of the disc rotor 50. In this example, the diameter of the enlarged diameter portion 62 starts from the outer side of the vehicle to the inner side with substantially the same diameter as the flange portion 5b, and gradually increases from the vicinity of the end point of the hat portion 54. Thus, efficient introduction and guidance of the cooling air can be realized in the guide path that guides the cooling air to the vicinity of the air guide hole 58.

  In the example of FIG. 2, the flange portion 5 b of the outer race 5 that contacts the end surface of the knuckle 40 is erected in the vicinity of the air guide hole 58. However, in cooperation with each other, the guide portion 60 is formed, and a cooling air guide path to the vicinity of the air guide hole 58 is defined. Further, since the cooling air is mainly introduced into the wheel from the front side of the vehicle, the enlarged diameter portion 62 may be provided at least on the front side of the vehicle, and is not necessarily provided over the entire circumference of the peripheral wall portion 42 of the knuckle 40. There is no need to be done.

  The resistance portion 64 is formed between the inner surface of the disk rotor 50 and the peripheral wall portion 42 of the knuckle 40 (or the flange portion 5b of the outer race 5). The resistance portion 64 is preferably set at a position outside the vehicle immediately after the air guide hole 58. In the example of FIG. 2, the resistance portion 64 is formed on the shelf portion of the two-stage hat portion 54 of the disk rotor 50 and protrudes toward the flange portion 5 b of the outer race 5. The resistance portion 64 is formed over the entire circumference of the disk rotor 50. Only a slight gap B is left between the resistance portion 64 and the flange portion 5b so that no interference can occur between them. Therefore, the size of the gap B is sufficiently smaller than the entrance width A between the enlarged diameter portion 62 and the disk rotor 50. As a result, the pressure of the cooling air introduced through the relatively large inlet width A is increased in the vicinity of the air guide hole 58 by the slight gap B (resistor portion 64) (going to the vehicle outer side than the air guide hole 58). The air flow is substantially blocked), and the cooling air can be efficiently guided to the air guide hole 58.

  FIG. 3 is a diagram showing another embodiment relating to the resistance portion 64. In the embodiment shown in FIG. 3 (A), the shelf portion of the two-stage hat portion 54 of the disk rotor 50 is formed substantially parallel to the vertical surface and faces the front end of the flange portion 5b of the outer race 5. The resistance part 64 is defined.

  In the embodiment shown in FIG. 3B, the disk rotor 50 has a one-stage hat portion 54, and a flange portion 55 projects from the hat portion 54 toward the flange portion 5 b of the outer race 5. The flange portion 55 may be set on the vehicle outer side immediately than the air guide hole 58 in the hat portion 54. Since the flange portion 55 of this embodiment is formed over the entire circumference of the disk rotor 50 as in the above-described embodiment, it can compensate for the strength reduction of the hat portion 54 caused by the formation of the air guide hole 58. it can.

  In the embodiment shown in FIG. 3C, the disk rotor 50 has a one-stage hat portion 54, and a plate 57 constituting a resistance portion 64 is newly provided between the hub 2 and the disk rotor 50. Similarly, the plate 57 includes a flange surface 57 a that fills a gap between the flange portion 5 b of the outer race 5 and the hat portion 54 of the disc rotor 50. Also in this case, as in the above-described embodiments, the pressure is increased in the vicinity of the air guide hole 58 due to the presence of the flange surface 57a (resistor 64), so that the cooling air is efficiently guided to the air guide hole 58. Can do. In this embodiment, the cooling structure can be reduced in weight by using, for example, a thin plate 57 made of resin or metal.

  Next, a modification of the present embodiment will be described.

  For example, in the first embodiment described above, the flange portion 5b of the outer race 5 protrudes to the vicinity of the hat portion 54 of the disk rotor 50, and constitutes the guide portion 60 (the enlarged diameter portion 62 and the resistance portion 64). The diameter of the flange portion 5b of the outer race 5 may be shortened, and the alternative portion may be constituted by the knuckle 40.

  In the first embodiment described above, the diameter of the flange portion 5b of the outer race 5 may be set large only on the front side of the vehicle in order to reduce the weight. Further, by providing a step in the vehicle interior / exterior direction on the flange portion 5 b of the outer race 5, the position of the resistance portion 64 in the vehicle interior / exterior direction with respect to the air guide hole 58 may be adjusted.

  In the first embodiment described above, a protrusion or the like is formed as the resistance portion 64 on the disk rotor 50 side. However, a protrusion or the like is formed on the flange portion 5b of the outer race 5 or the peripheral wall portion 42 of the knuckle 40. The resistance unit 64 may be defined.

(Second Embodiment)
4 to 6 are diagrams showing a second embodiment of the present invention. FIG. 4 is a cross-sectional view showing a brake device according to a second embodiment of the present invention. The brake device 100 according to the present embodiment includes a disc rotor 103 that rotates together with wheels. A pair of pads 105 that are pressed against the sliding surface of the disk rotor 103 are disposed on the inner side and the outer side of the disk rotor 103. Further, a caliper 109 that houses a pair of pistons 107 inside is provided across the outer periphery of the disk rotor 103. Further, the inner side and outer side pads 105 are respectively held on the end surfaces of the pistons 107, and the inner side and outer side pads 105 are pressed against the sliding surfaces of the disc rotor 103, whereby the rotation of the disc rotor 103 is performed. Braked.

  A disc rotor 103 having a hat portion 103 a is assembled to the hub flange portion of the hub 111 from the vehicle outer side direction, and a wheel 113 is assembled to the hat portion 103 a of the disc rotor 103 from the vehicle outer side direction. A bearing 117 such as a bearing is press-fitted to the inner periphery of the knuckle 115 supported by the vehicle body, and a hub 111 is press-fitted to the inner periphery of the bearing 117. Thereby, the hub 111 is assembled | attached rotatably with respect to a vehicle main body. A plurality of hub bolt holes are formed at equal intervals along the circumferential direction in the hub flange portion of the hub 111, and hub bolts are fitted into the hub bolt holes. The fitted hub bolts are inserted through the bolt holes formed in the disc rotor 103 and the wheel 113 from the vehicle inner side in this order. Further, the plurality of nuts are respectively screwed with the plurality of hub bolts inserted through the disk rotor 103 and the wheel 113. A plurality of cooling holes 113a are formed in the wheel 113 along the circumferential direction.

  FIG. 5 is a view showing the disk rotor 103 according to the second embodiment of the present invention, and is a view of the disk rotor 103 shown in FIG. 4 as viewed from the A direction. 6 is a partial cross-sectional view of the disk rotor 3 shown in FIG. 5 taken along a straight line BB ′.

  As shown in FIGS. 5 and 6, the disc rotor 103 according to the present embodiment has a pair of annular sliding plates 103 b that are spaced apart in the axle direction and arranged in parallel on the inner side and the outer side. A plurality of fins 103c that connect the pair of annular sliding plates 103b are formed radially in the radial direction of the annular sliding plate 103b. Further, each fin 103c and the pair of annular sliding plates 103b define a ventilation hole 103e, and the fin 103c extends from a position P on the radial extension line of the outer annular sliding plate 103b. . The fins 103c are arranged substantially in parallel with each other. The cross section of the fin 103c is formed in a bow shape, and the ventral side of the bow faces the wheel rotation direction when the vehicle moves forward. A plurality of air guide holes 103d are formed at equal intervals on the outer peripheral surface of the hat portion 103a, and the end of each fin 103c on the inner periphery side of the disk rotor is substantially the center of the air guide hole 103d formed on the outer periphery of the hat portion 103a. Is located. The disk rotor 103 has fins 103c twice as many as the air guide holes 103d formed on the outer periphery of the hat portion 103a. The fins 103c are formed in a substantially wing shape that allows the cooling air in the ventilation holes 103e to flow efficiently. The bottomed cylindrical hat portion 103a and the inner-side annular sliding plate 103b are continuously and integrally formed.

  In the ventilation hole 103e defined by the pair of annular sliding plates 103b and the fins 103c, the inlet cross-sectional area S1 of the ventilation hole 103e located on the inner peripheral side of the annular sliding plate 103b is an annular sliding plate. Each fin 103c is formed so that it may become smaller than exit cross-sectional area S2 of the vent hole 103e located in the outer peripheral side of 103b (S1 <S2). Thereby, the flow velocity V2 of the cooling air at the outlet of the ventilation hole 103e is increased from the flow velocity V1 of the cooling air at the inlet (V1 <V2), and the flow rate of the cooling air flowing through the ventilation hole 103e is increased.

  Next, the cooling action of the disk rotor 103 will be described.

  When the pad 105 is in frictional contact with the pair of annular sliding plates 103b during braking, frictional heat and braking torque are generated in the pair of annular sliding plates 103b. The frictional heat generated by the pair of annular sliding plates 103b is transmitted to the fins 103c, and the temperature of the ventilation holes 103e rises. On the other hand, the cooling air W1 flows from the outside of the wheel to the inside through the cooling hole 113a of the wheel 113, and the cooling air W2 flows from the inside to the outside of the hat portion 103a through the air guide hole 103d of the hat portion 103a. The cooling airs W1 and W2 flowing in from the cooling hole 113a and the air guide hole 103d flow from the inlet part of the ventilation hole 103e. Centrifugal force due to the rotation of the disk rotor 103 acts on the cooling air W1 and W2 flowing from the inlet portion of the vent hole 103e, and flows out from the outlet portion of the vent hole 103e. When the cooling air W1 and W2 pass through the ventilation holes 103e, they take heat in the ventilation holes and are discharged in the outer circumferential direction of the disk rotor 103, thereby lowering the temperature in the ventilation holes and efficiently cooling the entire disk rotor. is doing.

  As described above, the fin 103c is formed to extend from the position P on the radially extending line of the outer annular sliding plate 103b. Therefore, the cooling air can be efficiently introduced into the ventilation hole 103e without disturbing the flow of the cooling air flowing into the ventilation hole 103e. Moreover, since the inlet part of the ventilation hole 103e can be turned to the cooling hole 113a of the wheel 113, cooling air can be efficiently flowed into the ventilation hole 103e. In other words, the cooling performance of the disk rotor 103 is improved, a decrease in braking force of the brake can be suppressed, and the reliability of the disk rotor 103 can be improved. In addition, since the fin 103c extends from the hat portion 103a, it is possible to reinforce the hat portion 103a in which the air guide hole 103d is formed and the rigidity is lowered. Therefore, the rigidity of the disk rotor 103 can be increased, and surface runout and uneven wear of the disk rotor 103 can be prevented.

  Next, a modification of the present embodiment will be described.

  For example, in the second embodiment, the disc rotor 3 is applied to the opposed cylinder type (opposing type) brake device 100, but the disc rotor 103 is also applicable to a single cylinder type brake device. is there.

  In the second embodiment, the fin 103c extends from the position P on the radial extension line of the outer annular sliding plate 103b, but the fin 103c has a position P on the radial extension line. May extend from a position closer to the inner annular sliding plate, or may extend from a position closer to the wheel from a position P on the radial extension line. When the fin 103c extends from the position P on the radially extending line from the position closer to the inner annular sliding plate, the fin 103c is positioned from the position where the inlet of the air hole 103e faces the cooling hole 113a of the wheel 113. Should be extended. Further, when the fin 103c extends from the position near the wheel from the position P on the radial extension line, when the disk rotor 103 rotates, the fin 103c does not cause the turbulence of the air flow in the vicinity of the inlet of the ventilation hole 103e. It is only necessary that the fin 103c extends from such a position.

1 is a plan view of a disk rotor 10 according to a first embodiment of the present invention. It is sectional drawing of the main wheel components based on the 1st Embodiment of this invention. It is a figure which shows the other deformation | transformation regarding the resistance part. It is sectional drawing which shows the brake device which concerns on the 2nd Embodiment of this invention. FIG. 5 is a view showing a disk rotor according to a second embodiment of the present invention, and is a view of the disk rotor shown in FIG. 4 as viewed from the A direction. FIG. 6 is a partial cross-sectional view when the disk rotor shown in FIG. 5 is cut along a straight line BB ′.

Explanation of symbols

2 Hub 3 Bearing 5 Outer race 5b Flange part 30 Brake device 40 Knuckle 42 Peripheral wall part 50 Disc rotor 52 Outer part 52a Ventilation hole 52b Fin 54 Hat part 56 Mounting part 58 Air guide hole 60 Guide part 62 Expanding part 64 Resistance part 100 Brake Device 103 Disc rotor 103a Hat part 103b Toroidal sliding plate 103c Fin 103d Air guide hole 103e Ventilation hole 113 Wheel 113a Cooling hole

Claims (6)

An annular member having a hat-shaped cross section composed of an outer peripheral portion, a hat portion, and an attachment portion. A ventilation hole is formed on the outer side of the vehicle on the outer side of the vehicle, and a ventilation hole that is radially opposed to the ventilation hole is formed in the hat portion. An inner-hat type disk rotor formed;
A substantially cylindrical peripheral wall portion that is disposed radially inward of the hat portion of the disk rotor and extends inwardly and outwardly from the outer periphery of the disk rotor to at least the vicinity of the ventilation hole of the disk rotor in a vehicle inner / outer direction. A wheel component member,
Between the peripheral wall portion of the wheel component member and the hat portion of the disk rotor, air introduced from the front side of the vehicle is guided toward the air guide hole and directed to the vent hole through the air guide hole. A cooling structure for a disk rotor, characterized in that a guide portion that guides radially outward is provided.   2. The disk according to claim 1, wherein the guide part includes an enlarged diameter part formed on a peripheral wall part of the wheel constituent member, and the enlarged diameter part is set on a vehicle inner side than an outer peripheral part of the disk rotor. Rotor cooling structure.   The guide part includes a resistance part formed on the outer side of the vehicle with respect to the ventilation hole in the hat part of the disk rotor, and the resistance part inhibits an air flow toward the outside of the vehicle with respect to the ventilation hole. 3. The cooling structure of the disk rotor according to 1 or 2. A pair of annular sliding plates arranged in parallel on the inner side and the outer side apart in the axle direction;
A plurality of fins for connecting the pair of annular sliding plates and extending radially in the radial direction of the annular sliding plate and defining a vent hole between the pair of annular sliding plates When,
A disk rotor comprising a hat portion formed integrally and continuously with the annular sliding plate on the inner side and having a plurality of air guide holes on an outer peripheral surface;
The disk rotor according to claim 1, wherein the fin extends from a position on a radially extending line of the annular sliding plate on the outer side. The disk rotor according to claim 4,
The disk is characterized in that an inlet cross-sectional area of the vent hole located on the inner peripheral side of the annular sliding plate is smaller than an outlet cross-sectional area of the vent hole located on the outer peripheral side of the annular sliding plate. Rotor. The disk rotor according to claim 4 or 5, wherein
The disk rotor according to claim 1, wherein the air guide hole is formed in the vicinity of an inlet portion on the hat portion side of the ventilation hole.

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