JPH08164828A - Ventilated rotor - Google Patents

Abstract

PURPOSE: To provide a ventilated rotor that can obtain higher cooling effect than the conventional structure. CONSTITUTION: It is so constituted that air flow passing through a ventilating hole 5, communicating the inner peripheral surface 1A and the outer peripheral surface 1B with each other, at the rotating time of a ventilated rotor becomes swirl flow A. For instance, plural radiating fins 3,..., 3 forming the ventilating hole 5 are twisted from the inner peripheral side of the ventilated rotor 1 toward the outer peripheral side. Torsional structure for forming the swirl flow is thereby formed at the inner wall surface 5a of the ventilating hole 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake rotor which rotates together with a wheel and constitutes a friction surface with a brake pad, and forms a ventilation hole communicating from an inner peripheral surface side to an outer peripheral surface side to form a cooling effect. In particular, the invention relates to a ventilated rotor for improving the cooling efficiency, which is capable of obtaining a higher cooling effect than the conventional structure.

[0002]

2. Description of the Related Art As a conventional rotor for a disc brake with improved cooling effect, for example, Japanese Patent Application Laid-Open No. 6-3396 is disclosed.
There is one disclosed in Japanese Patent No. That is, the rotor of this conventional disc brake is also a ventilated rotor in which ventilation holes communicating from the inner peripheral surface side to the outer peripheral surface side are formed similarly to the rotor according to the present invention. A plurality of long partition walls and short partition walls extending from the inner peripheral side to the outer peripheral side are alternately arranged between a pair of disc-shaped sliding plates that are separated from each other on the left and right sides, and a plurality of radial partition walls are provided between the partition walls. And a plurality of inlet openings and outlet openings that communicate with the plurality of passages and open inward and outward in the radial direction.

With such a structure, the passage (ventilation hole)
As the flow rate of the cooling air passing through increases, the effective heat transfer area increases, so that the amount of heat radiation increases and the cooling effect improves.

[0004]

However, in the conventional ventilated rotor as described above, a measure for improving the cooling effect is to increase the cooling air volume and the effective heat transfer area. Therefore, it was not possible to expect such a high cooling effect in practice. That is, the cooling air passing through the ventilation holes of a normal ventilated rotor is generated because a pressure difference is generated between the inner peripheral side and the outer peripheral side of the rotor due to the rotation of the rotor. The inflow wind speed of the cooling air caused by is substantially determined by the rotational speed and the shape of the rotor. Therefore, the air volume of the cooling air passing through the air vent has an upper limit value depending on the cross-sectional area of the portion having the air vent and the rotation speed of the rotor. Therefore, the improvement of the cooling effect will reach a ceiling only by the measures for improving the cooling effect by increasing the effective heat transfer area.

The present invention has been made in view of the above-mentioned unsolved problems of the conventional techniques, and an object thereof is to provide a ventilated rotor capable of further improving the cooling effect. There is.

[0006]

In order to achieve the above object, the invention according to claim 1 is a ventilated rotor having ventilation holes formed between an inner peripheral surface and an outer peripheral surface, wherein the rotor is rotated when the rotor is rotated. A swirl flow generating means is provided for making an air flow passing through the ventilation hole from the inner peripheral side to the outer peripheral side into a swirl flow along the inner wall surface of the ventilation hole.

On the other hand, in order to achieve the above object, in the invention according to claim 2, a pair of discs which face each other in parallel and both discs are joined by being interposed between inner faces of the discs which face each other. In a ventilated rotor comprising a plurality of coupling members, wherein a ventilation hole passing between an inner peripheral surface and an outer peripheral surface is defined in a space surrounded by the pair of discs and the coupling member, the rotor is rotated when the rotor rotates. The swirl flow generation means is provided for making the air flow passing through the ventilation hole from the inner peripheral side to the outer peripheral side into a swirl flow along the inner wall of the ventilation hole.

The invention according to claim 3 is the ventilated rotor according to claim 2, wherein:
The coupling member is a radiating fin extending from the inner peripheral side to the outer peripheral side of the pair of discs. In the invention according to claim 4, in the ventilated rotor according to claim 3 of the invention, the outer peripheral surface side of the heat radiation fins is curved backward in the rotor rotation direction.

According to a fifth aspect of the invention, in the ventilated rotor according to the second aspect of the invention, the coupling member is a columnar heat radiation fin. As the swirl flow generating means in the inventions according to claims 1 to 5, the inventions according to the following claims 6 to 14 are adopted. That is, in the invention according to claim 6, in the ventilated rotor according to any one of claims 1 to 5, the swirl flow generating means has a twist structure of an inner wall surface of the ventilation hole. .

According to a seventh aspect of the invention, in the ventilated rotor according to the first to fifth aspects of the invention, the swirling flow generating means is provided near the inflow portion of the ventilation hole. I used it as a guide. The invention according to claim 8 is the ventilated rotor according to any one of claims 1 to 5, wherein the swirling flow generating means is provided near an inflow portion and an outflow portion of the ventilation hole. It was provided as a guide.

Further, the invention according to claim 9 is the ventilated rotor according to any one of claims 1 to 5, wherein the swirling flow generating means is spiral along the inner wall surface of the ventilation hole. The projections are formed so as to be continuous with. Furthermore, the invention according to claim 10 is the ventilated rotor according to any one of claims 1 to 5, wherein the swirling flow generating means has one end fixed to the inner wall surface of the ventilation hole and the other. The fin-shaped member whose end side is located in the ventilation hole, and the streamlined object fixed to the other end side of the fin-shaped member.

According to an eleventh aspect of the invention, in the ventilated rotor according to the first to fifth aspects of the invention, the swirling flow generating means is provided at a substantially central portion of an inner wall surface of the ventilation hole. The protrusion was formed to be long in the continuous direction of the inner wall surface. In this case, the invention according to claim 12 is
According to the eleventh aspect of the invention, the continuous direction of the elongated protrusions is inclined according to the shape of the inflow portion of the ventilation hole.

According to a thirteenth aspect of the present invention, in the ventilated rotor according to the eleventh or twelfth aspect of the invention, the inner bottom wall surface is continuous with the substantially central portion of the inner bottom wall surface of the ventilation hole. A long protrusion was formed in the direction. Further, the invention according to claim 14 is the ventilated rotor according to any one of claims 1 to 4,
The swirl flow generating means is a communication passage that opens in a substantially central portion of the inner wall surface of the ventilation hole and that communicates between adjacent ventilation holes.

[0014]

In the inventions according to claims 1 to 5, since the ventilation holes communicating from the inner peripheral surface to the outer peripheral surface of the rotor are formed, when the rotor rotates, the inner peripheral side and the outer peripheral side of the rotor rotate. Since a pressure difference occurs in the air flow, an air flow passing through the ventilation hole from the inner peripheral side to the outer peripheral side is generated. Then, the air flow becomes a swirl flow along the inner wall surface of the ventilation hole by the swirl flow generation means. Then, the velocity gradient of the air flow on the wall surface increases, and the temperature gradient on the inner wall surface (heat transfer surface) of the ventilation hole increases accordingly. Therefore, the amount of heat transfer from the inner wall surface of the ventilation hole to the air flow increases. To do.

In particular, in the invention according to claim 3, since the coupling member is a heat radiation fin extending from the inner peripheral side to the outer peripheral side, the heat transfer area is correspondingly increased and the air flow from the inner wall surface of the ventilation hole to the air flow. The amount of heat transfer of is increased. Further, in the invention according to claim 4, since the outer peripheral side is a curved ventilation hole curved backward in the rotational direction, the pressure loss at the air inflow portion of the ventilation hole is reduced, and the air flow rate is increased accordingly. .

On the other hand, in the invention according to claim 6, since the twist structure of the inner wall surface of the ventilation hole guides the air flow in the ventilation hole so as to swirl, a swirling flow is generated. Therefore, the effects of the inventions according to claims 1 to 5 are exhibited. When the twisted structure is formed, the surface area of the inner wall surface of the ventilation hole is increased accordingly, so that the heat transfer area is expanded and the amount of heat transfer from the inner wall surface of the ventilation hole to the air flow is increased.

Further, in the invention according to claim 7, since the guide provided near the inflow portion of the ventilation hole guides the airflow flowing into the ventilation hole so as to rotate, a swirling flow is generated. To be done. Therefore, the effects of the inventions according to claims 1 to 5 are exhibited. Further, in the invention according to claim 8, guides provided near the inflow portion and the outflow portion of the ventilation hole guide the airflow flowing into the ventilation hole and flowing out of the ventilation hole so as to swirl. Therefore, a swirling flow is generated. Therefore, the effects of the inventions according to claims 1 to 5 are exhibited.

Further, in the invention according to claim 9,
Since the protrusions formed so as to be continuous in a spiral shape guide the air flow in the ventilation hole to swirl, a swirling flow is generated. Therefore, the effects of the inventions according to claims 1 to 5 are exhibited. Furthermore, in the invention according to claim 10, the flow velocity of the air flow passing through the gap between the inner wall surface of the ventilation hole and the streamlined object supported by the fin-shaped member is increased, and vortices are generated. Is promoted to generate a swirling flow. Therefore, the effects of the inventions according to claims 1 to 5 are exhibited.

Further, in the invention according to claim 11, the air flow in the ventilation hole becomes a swirl flow due to the projection formed on the inner wall surface of the ventilation hole. Specifically, a swirl flow is generated above and below the ventilation hole with the projection as a boundary. Therefore, the effects of the inventions according to claims 1 to 5 are exhibited. In this case, as in the invention according to claim 12, when the continuous direction of the protrusions is inclined according to the shape of the inflow portion of the ventilation hole, even if the shape of the inflow portion is not vertically symmetrical, the protrusion is used as a boundary. Good swirl flow is generated above and below in the ventilation hole.

Further, in the invention according to claim 13, the inside of the ventilation hole is divided into four regions by the projection formed on the inner wall surface and the projection formed on the inner bottom wall surface, and swirling into each area. A stream is created. Here, when the ventilated rotor having the ventilation holes is rotated, the surface of the inner wall surface of the ventilation hole that faces the front in the rotor rotation direction becomes a pressure surface by receiving air pressure, and the surface that faces the rear in the rotor rotation direction becomes On the contrary, it becomes a negative pressure surface. Therefore, as in the invention according to claim 14, when the communication passage for connecting the adjacent ventilation holes is formed in the substantially central portion of the inner wall surface of the ventilation hole, the pressure is applied from the inner wall surface side to the negative side. The air moves to the inner wall surface side that is the pressure surface. Then, the amount of heat transfer on the negative pressure surface side where the air is supplied through the communication passage increases. Also,
Since the flow velocity on the inflow side of the communication passage increases, an air flow that flows in the width direction is formed in the substantially central portion of the ventilation hole, and a swirling flow is generated in the ventilation hole. Therefore, the above claims 1 to
The action of the invention according to claim 5 is exhibited.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing a configuration of a first embodiment of the present invention, FIG. 1 (a) is a front view of a ventilated rotor 1 with a part omitted, and FIG. 1 (b) is a ventilated rotor. FIG. 2 is a side view of the rotor 1, and FIG. 2 is an enlarged perspective view of an essential part of this embodiment, and specifically, is a view of FIG. 1A viewed from the II direction.

First, the structure will be described. The ventilated rotor 1 is a rotor fixed to a rotating shaft such as an axle so as to rotate integrally with the wheels of a vehicle. It is a disk-shaped member for generating a frictional force (braking force) by coming into contact with each other. That is, the ventilated rotor 1 of this embodiment includes a pair of disks 2A and 2B facing each other in parallel, and the disks 2A and 2B.
, A plurality of heat dissipating fins 3 serving as a connecting member for connecting the two disks 2A and 2B with each other interposed between the inner surfaces facing each other.
The outer surfaces of the two discs 2A and 2B are friction surfaces with the pads of the disc brake. In addition,
In order to make the configuration easy to understand, FIG.
One disk 2B is omitted.

Further, the central portions of the discs 2A and 2B are punched out in a circular shape which is larger than the outer diameter of the rotary shaft to which the ventilated rotor 1 is fixed, and the circular shape of one disc 2A. The cylindrical portion 4 is coaxially fixed to the punched inner peripheral portion. The cylindrical portion 4 is used when fixing the ventilated rotor 1 to the rotating shaft, and a bolt hole (not shown) or the like is formed in the cylindrical portion 4 as necessary.

On the other hand, the radiation fins 3, ...
It is an elongated member that extends from the inner diameter side of A, 2B to the outer diameter side, and is arranged radially at substantially equal intervals over the entire inner surface of the discs 2A, 2B in the circumferential direction. Therefore, in the space sandwiched between the two circular plates 2A and 2B, a plurality of radially extending fins 3, 2 ..., 3 from the inner peripheral surface 1A side to the outer peripheral surface 1B side of the ventilated rotor 1 are divided. Ventilation holes 5, ..., 5 are formed. It is desirable that the radiation fins 3, ..., 3 have a shape as close as possible to a wing shape, and that the surface thereof is subjected to surface treatment for suppressing peeling that reduces heat transfer efficiency.

The radiation fins 3, ..., 3 are shown in FIG.
In (a), it is drawn as an elongated straight member, but in reality, as shown in FIG. 2, the ventilated rotor 1 is twisted from the inner peripheral side toward the outer peripheral side, which allows ventilation. On the inner wall surface 5a of the hole 5, a twist structure is formed as a swirling flow generating means. Next, the operation of this embodiment will be described.

That is, since the ventilated rotor 1 fixed to the axle rotates integrally with the axle, the pressure in the direction in which the former side becomes higher on the inner peripheral surface 1A side and the outer peripheral surface 1B side due to the influence of centrifugal force or the like. A difference is generated, and as a result, an air flow passing through the inside of the ventilation hole 5 from the inner peripheral surface 1A side to the outer peripheral surface 1B side is generated. Then, the air flow acts as a cooling air flow to promote the heat radiation of the ventilated rotor 1 which is likely to be in a high temperature state due to the friction with the pad of the disc brake, but in the present embodiment, the inside of the ventilation hole 5 is promoted. Due to the twisted structure formed on the wall surface 5a, the air flow passing through the ventilation hole 5 becomes a swirling flow along the inner wall surface of the ventilation hole 5 as indicated by an arrow A in FIG.

Then, as compared with the case where the air flow passing through the ventilation hole 5 does not become a swirl flow, the heat radiation effect is remarkably improved. The reason will be described in detail below. First, a general theoretical equation of heat transfer is expressed by the following equation (1), where Q is a heat transfer amount per unit time, λ is a temperature gradient coefficient (a constant that can be a physical property value), and A is a heat transfer area. , And the concept is as shown in FIG.

Q = λA (∂T / ∂y) (1) Note that y is the distance from the heat transfer surface, and therefore (∂T / ∂
y) means a gradient (temperature gradient) according to the distance y of the temperature T. In FIG. 3, V is the wind speed of the cooling wind, and is a speed gradient (∂V / ∂y) that is a slope according to the distance y of the wind speed V.
Is closely related to the temperature gradient (∂T / ∂y) as shown in FIG.

On the other hand, the ventilation hole 5 of the ventilated rotor 1 can be regarded as a conduit, and the flow developed in a normal conduit is Poiseuille flo as shown in FIG.
w). In this case, if the pressure difference between the inflow side and the outflow side of the pipeline can be increased, the flow rate in the pipeline increases and the velocity gradient and the temperature gradient become larger than in the case of FIG. Such a velocity distribution is obtained, which increases the amount of heat transfer. This is the conventional general idea. That is, by increasing the “air volume” of the cooling air passing through the ventilation holes 5, the velocity gradient is increased and the heat transfer amount Q is increased.

However, the distribution shown in FIG.
With such a velocity distribution, although the flow rate is certainly increasing, the velocity gradient on the heat transfer surface becomes smaller, the temperature gradient on the heat transfer surface becomes smaller, and the heat transfer amount decreases. Resulting in. That is, the ventilation holes 5 of the ventilated rotor 1
Even if the amount of the cooling air passing through the inside is increased, it is sufficient if the state of the velocity distribution shown in FIG. 5 is always maintained. However, if the velocity distribution shown in FIG. 6 is obtained, The sufficient cooling effect cannot be obtained.

On the other hand, if the velocity distribution of the cooling air in the ventilation holes 5 of the ventilated rotor 1 becomes a large velocity distribution near the pipe as shown in FIG. 7, the flow rate does not have to be increased. However, since the velocity gradient on the heat transfer surface becomes large and the temperature gradient on the heat transfer surface becomes large, the amount of heat transfer can be increased. The flow velocity distribution as shown in FIG. 7 corresponds to a spiral flow along the inner wall surface of the ventilation hole 5, that is, a swirling flow.

As is clear from the above description, with the structure of this embodiment, a twisted structure is formed on the inner wall surface of the ventilation hole 5 so that the swirling flow A along the ventilation hole 5 is generated. Therefore, the velocity gradient on the inner wall surface of the ventilation hole 5 which is the heat transfer surface increases, and the temperature gradient also increases accordingly, and the amount of heat transfer increases. When the amount of heat transferred from the inner wall surface of the ventilation hole 5 to the air flow is increased, the cooling effect of the ventilated rotor 1 is improved, and the rotor of the disc brake having excellent durability can be obtained.

Further, when the structure for generating the swirling flow by the twisted structure is adopted as in the present embodiment, it is not necessary to provide a new member for generating the swirling flow, and the twisted structure allows the inside of the ventilation hole 5 to be formed. Since the surface area of the wall surface increases,
This also has the advantage of increasing the amount of heat transfer. FIG.
[FIG. 8] is a view showing a second embodiment of the present invention and is an enlarged plan view of a main part of the ventilated rotor 1. The same members and parts as those in the first embodiment are designated by the same reference numerals,
The overlapping description is omitted.

That is, in the present embodiment, the twisted structure is not formed on the inner wall surface of the ventilation hole 5, but the guide 7 is provided slightly outside the inflow portion 5A of each ventilation hole 5, and this guide is provided. The air flow passing through the ventilation holes 5 is made to be the same swirling flow as in the first embodiment. That is, in the present embodiment, the swirl flow generating means is constituted by the guide 7 provided for each ventilation hole 5.

Specifically, the guide 7 has a structure in which a smooth concave curved surface 7c is formed between an inner end 7a facing forward in the rotor rotation direction and an outer end 7b facing outward in the radial direction. The inflow direction of the cooling air to the ventilation hole 5 determined by the concave curved surface 7c is slightly inclined with respect to the straight line in the radial direction so that a swirling flow is generated. Further, the guide 7 is fixed to, for example, the inner peripheral surface of the cylindrical portion 4 shown in the first embodiment, but instead of fixing the plurality of guides 7 individually, the inner peripheral portion of the ring-shaped member is not fixed. If a member to which a plurality of guides 7 are fixed according to the intervals of the ventilation holes 5 is manufactured in advance and the ring-shaped member is fixed to the inner peripheral surface of the cylindrical portion 4, the time and effort required for assembly are extremely high. Can be avoided.

With the structure of this embodiment, the ventilation hole 5
The airflow passing through the inside from the inflow portion 5A side to the outflow portion 5B side is guided by the guide 7 and becomes a swirl flow when flowing into the ventilation hole 5, so that the same effect as the first embodiment can be obtained. Be done. In the present embodiment, the guide 7
The swirling flow is generated by the above-described structure, and it is not necessary to form a twisted structure on the inner wall surface 5a of the ventilation hole 5 as in the first embodiment. There is an advantage that it can be applied without doing. The guide 7 may be arranged at a position near the inflow portion 5A, and may be fixed inside the ventilation hole 5, for example.

Although not shown in particular, the vicinity of the vent hole 5 on the outflow portion 5B side (for example, slightly outside or slightly inside)
If another guide is provided to smoothly guide the outflow of the swirl flow generated by the guide 7,
Since the generated swirling flow is intensified, the velocity gradient on the inner wall surface of the ventilation hole 5 which is the heat transfer surface is further increased, and accordingly, the temperature gradient is also increased and the heat transfer amount is further increased. To be

FIG. 9 is a view showing a third embodiment of the present invention, and is an enlarged perspective view of a main part of the ventilated rotor 1, and FIG. It is the figure which looked at the ventilated rotor 1 as shown in a) from the II direction. The same members and parts as those in the first embodiment are designated by the same reference numerals, and their duplicated description will be omitted. That is,
In this embodiment, the ventilation holes 5 are provided as in the first embodiment.
Of the ventilated rotor 1 in the vicinity of the inflow portion 5A and the outflow portion 5B without forming a twisted structure on the inner wall surface of the rotor and not providing the guide 7 as in the second embodiment. A swirling flow is generated by the projections 8, ..., 8 formed as guides at substantially central portions in the vertical direction (vertical direction in FIG. 9). That is, in this embodiment, the swirl flow generating means is constituted by the projections 8, ...

Specifically, each protrusion 8 has a center in the thickness direction of the ventilated rotor 1 that is pointed in the horizontal direction of the rotor (direction along the rotor rotation direction), and is pointed in the thickness direction from the tip. The upper and lower ends of the are mountain-shaped protrusions that curve and become lower. With such a configuration, the airflow that flows into the ventilation holes 5 when the rotor is rotating is provided with a pair of protrusions 8 (only one of which is shown in FIG. 9) provided on the left and right of the central portion in the thickness direction on the inflow portion 5A side and facing inward. Is shown above.)
As a result, a pair of upper and lower swirling flows as shown in FIGS. 9B and 9C are generated. In addition, the generated swirling flow is the outflow portion 5B.
There is also an action of being strengthened by a pair of protrusions 8 provided on the left and right of the central portion in the thickness direction on the side and facing inward.

Therefore, even with the configuration of this embodiment, the air flow passing through the ventilation holes 5 becomes a swirl flow, and therefore the same effect as that of the first embodiment can be obtained. Figure 10
(A) And (b) is a figure which shows 4th Example of this invention, (a) is the top view which expanded the principal part of the ventilated rotor 1, and (b) is the principal part. It is an expanded perspective view. The same members and parts as those in the first embodiment are designated by the same reference numerals, and their duplicated description will be omitted.

That is, in the present embodiment, the spiral holes are continuous along the inner wall surface of the ventilation hole 5 (that is, the surface forming the ventilation holes 5 of the circular plates 2A, 2B and the heat radiation fins 3). The protrusions 9 are formed as described above, so that a swirling flow is generated in the ventilation holes 5. That is, in the present embodiment, the spiral flow generating means is constituted by the spirally continuous projections 9. In this embodiment, as shown in the enlarged view of FIG. 10B, the projection 9 is composed of a pair of parallel projections 9a and 9b, and each projection 9a and 9b has a trapezoidal cross section. ing.

With this structure, the airflow flowing from the inflow portion 5A of the ventilation hole 5 when the rotor is rotated is directed by the projections 9 and draws a spiral orbit. As a swirl flow, the same effect as that of the first embodiment can be obtained. 11 (a) and 11 (b) are views showing a fifth embodiment of the present invention, FIG. 11 (a) is an enlarged plan view of a main part of the ventilated rotor 1, and FIG. 11 (b) is It is the figure which looked at the same (a) from the XI direction. The same members and parts as those in the first embodiment are designated by the same reference numerals, and their duplicated description will be omitted.

That is, in this embodiment, the outflow portion 5 of the ventilation hole 5
A plurality of fin-shaped members 10 each having one end fixed to the central portions of both the inner wall surfaces 5a and the upper and lower inner bottom surfaces 5b in the vicinity of B and the other end located at the center of the ventilation hole 5, and the fin-shaped members 1
0, which is fixed to the other end of the ventilation hole 5 and faces the longitudinal direction of the ventilation hole 5, and the fin-shaped member 10
A swirl flow is generated in the ventilation hole 5 by the streamlined object 11. That is, in the present embodiment, the fin-shaped member 10 and the streamlined object 11 constitute a swirling flow generating means.

With such a structure, the air flow passing through the ventilation holes 5 when the rotor is rotated passes through the four regions divided by the fin-shaped members 10, ..., 10 shown in FIG. 11 (b). At that time, the flow velocity increases, and vortices are generated in these regions, and the air flow passing through the ventilation holes 5 becomes a swirl flow, so that the same effect as the first embodiment can be obtained. In this case, the swirling flow can be strengthened by twisting the support fins 10, ..., 10 so that the vortex becomes stronger.

Further, according to the structure of this embodiment, the fin-shaped member 10 also has a large heat transfer area, so that the heat transfer amount is increased accordingly. 12 (a) and 12 (b) are views showing a sixth embodiment of the present invention, FIG. 12 (a) is a plan view of the ventilated rotor 1, and FIG. 12 (b) is an enlarged main part. It is a perspective view. In addition, the first
The same members and parts as those in the embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

That is, in this embodiment, the radiation fins 3, ..., 3 extending from the inner diameter side to the outer diameter side of the disc 2A are arranged such that the outer diameter side end thereof is located rearward of the inner diameter side end in the rotor rotation direction. It is bent so as to be positioned, and this allows each ventilation hole 5
Has a curved shape in which the outflow portion 5B is located rearward of the inflow portion 5A in the rotor rotation direction. And FIG. 12 (b)
As shown in the enlarged view of FIG. 3, the radiating fins 3, ..., 3 are twisted to form a twisted structure as a swirling flow generating means on the inner wall surface 5a of each ventilation hole 5.

With this structure, since the ventilation holes 5 are curved, it is possible to generate an air flow with a small pressure loss at the inflow portion 5A, so that the air passing through the ventilation holes 5 can be generated. Of the inner wall surface 5a, and the cooling effect can be improved.
Since a swirling flow is generated by the twisting, the cooling effect can be improved by the same action as in the first embodiment.
That is, a greater improvement of the cooling effect can be obtained by both the improvement of the cooling effect by the increase of the air flow rate and the improvement of the cooling effect by the increase of the temperature gradient. When the ventilation hole 5 has a curved shape as in this embodiment, a swirl flow is generated by using, for example, the swirl flow generating means in the above second to fifth embodiments without providing the inner wall surface 5a with a twisted structure. Even if it does, the same effect as the first embodiment can be obtained.

FIGS. 13 and 14 are views showing a sixth embodiment of the present invention, FIG. 13 is a perspective view of the radiation fin 3, and FIGS. 14 (1) and 14 (2) are operational effects of the embodiment. It is a figure for explaining. The same members and parts as those in the first embodiment are designated by the same reference numerals, and their duplicated description will be omitted. That is, in the present embodiment, the radiation fins 3 extending from the inner peripheral surface 1A side of the ventilated rotor 1 to the outer peripheral surface 1B side have the entire peripheral surface including the side surface to be the inner wall surface 5a of the ventilation hole 5. A long continuous projection 15 is formed, and a smooth concave curved surface is formed between the projection 15 and a portion of the heat dissipation fin 3 where the heat dissipation fin 3 is connected to both the disks 2A and 2B. Grooves 16A, 16B having two stages of grooves 16A, 16B are formed and have smooth concave curved surfaces.
The protrusion 15 forming B constitutes swirling flow generation means.

With this structure, the air flow passing through the ventilation holes 5 from the inner peripheral surface 1A side to the outer peripheral surface 1B side when the rotor rotates is divided into upper and lower parts by the projections 15 which face forward in the rotor rotating direction. The divided air flow is the grooves 16A, 16
Since it comes to be wound around the discs 2A and 2B along the inner surface of B, a swirling flow is generated along the grooves 16A and 16B. As a result, the temperature distribution along the grooves 16A and 16B is obtained by simulation.
As shown in (1) and (2), the temperature gradient near the wall surface on the pressure surface of the grooves 16A, 16B (the surface facing forward in the rotor rotation direction of the heat radiation fins 3) from the inner peripheral surface 1A side to the outer peripheral surface 1B side. Is increased, the swirling flow is generated by the inductive action of the swirling flow generated on the pressure surface side on the negative pressure surface (the surface facing the rear side in the rotor rotation direction of the radiating fins 3), and the temperature gradient near the wall surface is also increased. As in the case of the first embodiment, it is possible to obtain the effect of increasing the heat transfer amount in the peeling area. 14 (2) (a)-
14H shows the temperature distribution at the positions (a) to (h) in FIG. 14 (1), the pressure surface (the left side of (a) to (h) in FIG. 14 (2)) and the negative pressure surface (FIG. 14 ( 2) (right side of (a) to (h)).

Further, according to the structure of this embodiment, the projection 15
Since the surface area of the inner wall surface of the ventilation hole 5 is increased by the amount of the formation of the above, there is also an advantage that the heat transfer amount is increased by this.
15 and 16 are views showing a seventh embodiment of the present invention, FIG. 15 is a partial plan view of the ventilated rotor 1, and FIG. 16 is a ventilator for showing the cross-sectional shape of the ventilation holes 5. 3 is a sectional view of the Ted rotor 1. FIG. The same members and parts as those in each of the above-described embodiments are designated by the same reference numerals, and the duplicated description will be omitted.

That is, the structure of this embodiment is substantially the same as that of the above-mentioned sixth embodiment, except that the ventilation of each of the disks 2A and 2B forming the inner bottom wall surface 5b of the ventilation hole 5 is different. The point is that a long protrusion 17 is formed at a substantially central portion of the hole 5 and in a radial direction which is a continuous direction of the inner bottom wall surface of the hole 5. Specifically, the protrusion 17 is an acute-angled protrusion that faces the central portion of the ventilation hole 5 similarly to the protrusion 15, and the grooves 16A, 1
6B is smoothly continuous.

With such a structure, the swirling flow generated by the projections 15 described in the fifth embodiment tends to be strengthened by the projections 17, so that each ventilation hole 5 has a structure as shown in FIG. Four strong swirling flows D _{1 to} D ₄ are generated, and the temperature gradient in the vicinity of the inner wall surface of the ventilation hole 5 is increased to improve the heat transfer amount. Further, since the projections 17 are provided, there is an advantage that the surface area of the inner wall surface of the ventilation hole 5 is further expanded and the heat transfer amount is increased.

Further, as shown in FIG. 17, the structure for generating a swirl flow in the projection 15 is a structure in which the heat radiation fin 3 is bent so that its outer end side is located rearward of the inner end side in the rotor rotation direction. It is also possible to apply. Alternatively, FIG.
As shown in FIG. 5, the present invention can be applied to a columnar heat radiation fin 20 as a coupling member, and similar effects can be obtained by these, and if a large number of columnar heat radiation fins 20 are provided, the heat transfer area can be increased. There is an advantage that the cooling effect can be improved by the above.

Further, as shown in FIG. 19 showing the shape of the inflow portion 5A of the ventilation hole 5, the radiation fins 3 and the disc 2 are provided.
A ventilation hole in which the shape of the inflow portion 5A is not vertically symmetrical, as in the case where the radius of curvature R ₁ of the joint with A is not equal to the radius of curvature R ₂ of the joint between the heat radiation fin 3 and the disc 2B. In the case of _No. 5, there is a difference in the size of the pair of upper and lower swirling flows due to the difference in the radii of curvature R ₁ and R ₂ , so
20, as shown in FIG. 20, from the inner peripheral surface 1A side to the outer peripheral surface 1B.
It is desirable to incline toward the side. Specifically, the end portion of the projection 15 on the inner peripheral surface 1A side is connected to the heat radiation fin 3 and the disc 2A,
2B is closer to the smaller radius of curvature of the joint, and as it approaches the outer peripheral surface 1B side, the projection 15 is inclined so as to be closer to the larger radius of curvature of the joint between the heat radiation fin 3 and the discs 2A and 2B. You can do it.

21 and 22 are views showing an eighth embodiment of the present invention, FIG. 21 is an enlarged perspective view of a main part of the ventilated rotor 1, and FIG. 3 is a cross-sectional view showing the cross-sectional shape of the ventilation holes 5 adjacent to each other in FIG. The same members and parts as those in each of the above-described embodiments are designated by the same reference numerals, and the duplicated description will be omitted. That is, in the present embodiment, a long hole extending in the radial direction that connects two adjacent ventilation holes 5 to the central portion of the heat radiation fin 3 extending from the inner peripheral surface 1A side of the ventilated rotor 1 to the outer peripheral surface 1B side. And a swirling flow E, F.
I am trying to generate. That is, in this embodiment,
The communication passage 21 constitutes a swirling flow generating means.

Specifically, when the ventilated rotor 1 is rotating, the ventilation holes 5 formed on both sides of the radiation fins 3 are formed.
In the inner wall surface 5 a of the inner wall surface 5 a, the side that faces the front in the rotor rotation direction is the pressure surface, and the surface that faces the rear in the rotor rotation direction is the negative pressure surface. The air moves G, and the movement of the air becomes an air flow G that is directed rearward in the rotor rotation direction through the central portion of the ventilation hole 5. Then, the air flow passing from the inner peripheral surface 1A side of the ventilated rotor 1 to the outer peripheral surface 1B side of the ventilated rotor 1 is twisted by the air flow G into swirling flows E and F. Therefore, the same effect as that of the first embodiment can be obtained. Further, in this embodiment, the air flow G
Has a merit that the amount of heat transfer is further increased because it passes through the communication passage 21 formed in the radiation fin 3 at high speed.

Furthermore, as shown in FIG. 23, a plurality of communication passages 2
If 1 is formed, it is possible to avoid a disadvantage in strength, and there is an advantage that a heat radiation area is increased and a heat transfer amount is increased. Then, as in the present embodiment, the communication passage 2
Even in the configuration in which the first embodiment is provided, as shown in FIG. 12, the radiating fins 3 may be bent to form the ventilation holes 5 in a curved shape. In that case, the same effect as that of the fifth embodiment can be obtained.

In each of the above embodiments, the case where the present invention is applied to the ventilated rotor 1 having the heat radiation fins 3 extending mainly from the inner peripheral surface 1A side to the outer peripheral surface 1B side has been described. The same action and effect can be obtained by forming the swirl flow generating means as in the first to fifth embodiments on the columnar radiating fin 20 as described above. It is also possible to improve the cooling effect by increasing the heat area.

[0059]

As described above, according to the inventions according to claims 1 to 5, the air flow passing from the inner peripheral side to the outer peripheral side through the ventilation holes becomes a swirling flow when the rotor rotates, so that the ventilation is performed. The amount of heat transfer from the inner wall surface of the hole to the air flow can be increased, and the cooling effect of the ventilated rotor can be significantly improved.

In particular, in the invention according to claim 3, since the radiation fins having a large heat transfer area are used, the heat transfer amount is further increased and the cooling effect of the ventilated rotor is greatly improved. There is an effect that can be. Also,
In the invention according to claim 4, there is an effect that the pressure loss at the air inflow portion of the ventilation hole is reduced, so that the air flow rate is increased and the cooling effect is improved accordingly.

Further, according to the inventions of claims 6 to 14, there is an effect that a swirling flow for surely producing the effects of the inventions of claims 1 to 5 can be generated. In particular, in the invention according to claim 6, a swirling flow can be generated without providing a new member, and the heat transfer area is expanded by the twisted structure so that the air flow from the inner wall surface of the ventilation hole to the air flow. Since the amount of heat transfer is increased, the cooling effect is further improved.

The invention according to claim 7 or 8 can be easily applied to a conventional ventilated rotor. The inventions according to claims 11 to 14 also have an effect of increasing the heat transfer area and improving the cooling effect.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a first embodiment of the present invention.

FIG. 2 is a perspective view of the configuration of FIG. 1 viewed from a II direction.

FIG. 3 is an explanatory diagram of a temperature gradient and a velocity gradient.

FIG. 4 is a diagram showing a flow state in a pipeline.

FIG. 5 is a diagram showing a flow state in a pipe when the flow rate is increased.

FIG. 6 is a diagram showing a state of flow in the pipe when the flow velocity in the central portion is increased.

FIG. 7 is a diagram showing an ideal flow state for heat transfer.

FIG. 8 is an enlarged plan view of a main part of the second embodiment.

FIG. 9 is an enlarged perspective view of a main part of the third embodiment.

FIG. 10 is a diagram showing a fourth embodiment.

FIG. 11 is a diagram showing a fifth embodiment.

FIG. 12 is a diagram showing a sixth embodiment.

FIG. 13 is an enlarged perspective view of a main part of the seventh embodiment.

FIG. 14 is a diagram for explaining the operation of the seventh embodiment.

FIG. 15 is an enlarged plan view of an essential part of the eighth embodiment.

FIG. 16 is a sectional view of a ventilation hole for explaining the operation of the eighth embodiment.

FIG. 17 is a perspective view of an air vent having a curved shape in the eighth embodiment.

FIG. 18 is a perspective view showing a case where the heat radiation fin is formed into a column shape in the eighth embodiment.

FIG. 19 is a diagram showing a shape of an inflow portion of a ventilation hole.

FIG. 20 is a perspective view showing a case where the continuous direction of the protrusions is inclined in the eighth embodiment.

FIG. 21 is an enlarged perspective view of the essential parts of the ninth embodiment.

FIG. 22 is a sectional view for explaining the operation of the ninth embodiment.

FIG. 23 is a perspective view when a plurality of communication passages are provided in the ninth embodiment.

[Explanation of symbols]

1 Ventilated rotor 1A Inner peripheral surface 1B Outer peripheral surface 2A, 2B Disc 3 Radiating fin (coupling member) 5 Vent hole 5A Inflow part 5B Outflow part 5a Inner wall surface 5b Inner bottom wall surface 7 Guide 8 Projection (guide) 9 Projection 10 Fin-shaped member 11 Streamlined object 15, 17 Projection 16A, 16B Groove 20 Radiating fin (coupling member, columnar radiating fin) 21 Communication path A, B, C, D _{1 to} D ₄ , E, F Swirling flow

Claims (14)

[Claims] 1. A ventilated rotor having a ventilation hole formed between an inner peripheral surface and an outer peripheral surface, wherein an air flow passing from the inner peripheral side to the outer peripheral side in the ventilation hole when the rotor rotates A ventilated rotor having swirl flow generation means for generating swirl flow along the inner wall surface of the rotor. 2. A pair of discs, which are parallel to each other, and a plurality of coupling members, which are interposed between the inner faces of the discs and are opposed to each other, for coupling the two discs. In a ventilated rotor in which a ventilation hole passing between an inner peripheral surface and an outer peripheral surface is defined in a space surrounded by a coupling member, an air flow passing from the inner peripheral side to the outer peripheral side in the ventilation hole when the rotor rotates. A ventilated rotor, characterized in that swirling flow generating means for generating a swirling flow along the inner wall of the ventilation hole is provided. 3. The ventilated rotor according to claim 2, wherein the coupling member is a heat radiation fin extending from the inner peripheral side to the outer peripheral side of the pair of discs. 4. The ventilated rotor according to claim 3, wherein an outer peripheral surface side of the heat radiation fin is curved rearward in a rotor rotation direction. 5. The ventilated rotor according to claim 2, wherein the coupling member is a columnar radiating fin. 6. The ventilated rotor according to claim 1, wherein the swirl flow generating means has a twisted structure of an inner wall surface of the ventilation hole. 7. The ventilated rotor according to claim 1, wherein the swirl flow generating means is a guide provided near an inflow portion of the ventilation hole. 8. The ventilated rotor according to claim 1, wherein the swirl flow generating means is a guide provided near an inflow portion and an outflow portion of the ventilation hole. 9. The ventilated assembly according to claim 1, wherein the swirl flow generating means is a protrusion formed so as to continue spirally along an inner wall surface of the ventilation hole. Rotor. 10. The swirl flow generation means has a fin-shaped member having one end fixed to the inner wall surface of the ventilation hole and the other end positioned in the ventilation hole, and fixed to the other end of the fin-shaped member. 6. The ventilated rotor according to any one of claims 1 to 5, wherein the ventilated rotor is formed of a streamlined object. 11. The swirl flow generating means is a protrusion formed in a substantially central portion of an inner wall surface of the ventilation hole, the protrusion being elongated in a continuous direction of the inner wall surface. Ventilated rotor. 12. The ventilated rotor according to claim 11, wherein the continuous direction of the elongated protrusions is inclined according to the shape of the inflow portion of the ventilation hole. 13. A projection, which is long in the continuous direction of the inner bottom wall surface, is formed at a substantially central portion of the inner bottom wall surface of the ventilation hole.
Alternatively, the ventilated rotor according to claim 12. 14. The swirl flow generating means is a communication passage which opens in a substantially central portion of an inner wall surface of the ventilation hole and which communicates between adjacent ventilation holes. Ventilated rotor as described.