JPS591825A - Ventilated rotor - Google Patents

Abstract

PURPOSE:To improve the efficiency of heat radiation by aggressively taking air into an air hole and generating thermal conductivity in company by turbulent flow at a heat generating part. CONSTITUTION:When a ventilated rotor 1 is rotated, the air from the first air intake port 4b, the air introduced through the guide of a fin 3a from the second air intake port 4 adhead, and the supplementary air from the third air intake port 4d by the Venturi effect caused when the air passes through a throttled part 4a, are introduced into the air hole 4 and generate turbulent flows as they pass through the turbulence promoter 5. The frictional heat of the rotor removes the excess heat equivalent to the air-eddy temperature conductivity ratio more than in the case of the laminar flow and improve the efficiency of heat radiation together with the increased air volume by the Venturi effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ventilated rotor with improved heat dissipation performance.

Conventional ventilated rotors used in disc brakes have deteriorated pad wear resistance due to temperature rise due to frictional heat during vehicle braking, and the axle bearing temperature has become abnormally high. In order to avoid this, radial ventilation holes are provided inside the rotor, and this is especially used in disc brakes for large vehicles. However, because disc brakes lack openness when installed on a vehicle, the amount of air taken into the vents is not always sufficient, and as vehicles become larger and faster, heat dissipates even more. A superior in performance is desired.

The present invention has been made in view of the above-mentioned circumstances.
In a ventilated rotor, the purpose is to actively take in air into the ventilation holes and simultaneously cause heat transfer through turbulence in the heat generating section to improve heat dissipation performance.

A ventilated rotor according to the present invention will be explained based on the drawings.

FIG. 1 shows a cross-sectional end face of the upper half of the rotor.

Reference numeral 1 is a rotor body, 2 is a flange portion of the rotor, and a mounting hole 2a for mounting on an axle or the like, which is a rotating part of a vehicle, is provided. A plurality of ventilation holes 4 having a circular cross section are radially provided inside the sliding friction portion 3 of the rotor. The ventilation hole 4 is provided with a reduced diameter portion 4a in the middle to provide a Venturi effect. The ventilation hole 4 has a first air intake port 4b at its lower end, a second air intake port 4c at an upper position thereof,
Further, in order to effectively introduce air into the second air intake port 4c by forward rotation of the rotor body 1, a fin 3& is provided at the rear edge. The third air intake port 4d is the reduced diameter portion 4 &
The vent holes 4 are provided facing each other on both sides of the vent holes 4, and are designed to actively draw outside air into the vent holes 4 by the Venturi effect.

A turbulence promoter (turbulence promoter) 5 is fixed to the tip of the ventilation hole 4. Note that the angle of expansion from the diameter-reduced portion 4a toward the front is preferably 5 to 6 degrees, and the rougher this surface is, the better in terms of turbulent flow formation. The structure of the turbulence promoter is shown in Figure 2 (a) and (b) as an example.
Four locking pieces 5a, 5a', 5a'', 5B# that come into contact with the inner wall of the vent hole 4 to perform a fixing action, and a tip of the vent hole 4 that extends obliquely to the axis of the vent hole 4. Four blades 5b extend in the direction to generate turbulent flow.

5b', 5b', and 5b'''.The formation process will be explained in detail.As shown in FIG. 5GIL
From the base of the protruding piece 5°, the blade portion 5°b and the thin metal plate 5o having a curved portion along the inner wall of the ventilation hole 4 are bent in opposite directions at the points indicated by dotted lines to form a third blade. Figure (b)
As shown in the figure, an arcuate locking piece 5a and a blade 5b oblique to the axis of the ventilation hole 4 are formed. Similarly, the locking piece 5
m' and the blade 5b', the locking piece part 5a'' and the blade 5V1, the locking piece part 5a'' and the blade 5b'' are formed, respectively, and the locking piece parts 51L and 5a'.

The opposite end surfaces of 5a'', 5&# are brought together and welded to form the turbulence promoter 5 as one body.As shown in FIG. 4(a), there are locking pieces 5a, 5 on both sides.
Projecting pieces 5'0 &15'6a' forming a', and projecting pieces 5'6a 15'. A thin metal plate 5/ made up of blade parts 5'ob, 5', and b' having a curved part along the inner wall of the ventilation hole 4 from the root of a' is bent at right angles at the dot-dashed line in the center. After that, the arc-shaped locking piece portion 5& and the locking piece portion 5&
' are bent in opposite directions to form vanes 5b and 5b' that extend obliquely to the axis of the ventilation hole 4, and in the same manner, the locking pieces 5a" and 5a" and the vane St are formed. /'.

5b'' may be welded together with the bent portions at the dashed-dotted line butted against each other to be integrated.

In addition, the locking pieces 5a, 5a', 5m'
, 5 a'' may be fixed to the inner wall of the vent hole 4 with adhesive, or a protrusion may be provided on the inner wall of the vent hole 4 and the turbulence promoter 5 may be rotated slightly after insertion to attach the locking piece. Part 5 a, 5 a', 5 a', 5 a
The end face of M may be engaged with the protrusion to prevent it from coming off.

FIG. 5 shows another structural example of a turbulence promoter. This turbulence blow motor 5' is made of a relatively thick plate and has a locking piece 5'a having a cross-shaped cross section, and a spiral blade 5'b fixed to the tip of the locking piece 5'a. When the locking piece 5'a is formed of such a relatively thick plate, it can be fixed to the inner wall of the vent hole 4 by press fitting.

In any case, the turbulence promoter may be any blade-like body that generates turbulent flow on the downstream side.

Since the ventilated rotor according to the present invention is configured as described above, when the rotor main body 1 rotates, the air of υ from the first air intake port 4b flows into the ventilation hole 4, and the fins 3a
The second air intake port 4C is guided by and provided in front of the second air intake port 4C.
The third air intake port 4d is caused by the Venturi effect that occurs when the air passes through the reduced diameter portion 4a.
More make-up air is introduced into the vent 4 and passes through the turbulence promoter 5 creating turbulence. During braking, the heat generated in the sliding friction parts 3, 3 of the rotor due to the sliding contact of the pads (not shown) is more than the amount of heat removed when the air flow is laminar, by the amount compensated by the low temperature conductivity. Combined with the increased amount of air due to the Venturi effect of the four colors of the reduced diameter parts, the heat dissipation performance is improved.

The ventilated rotor according to the present invention has radial ventilation holes provided inside the rotor, a reduced diameter portion with an air intake port formed on the side wall of the ventilation hole, and the ventilation hole provided on the tip side of the reduced diameter portion. A turbulence promoter with wings extending obliquely in the axial direction was fixed. Therefore, compared to conventional ventilated rotors, it is possible to provide a ventilated rotor that can take in a large amount of air into the ventilation holes and has superior heat dissipation performance due to increased thermal conductivity due to the turbulence effect. Ta.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional end view of the upper half of the ventilated rotor according to the present invention, FIG. 2 (A) is a front view showing an example of the turbulence promoter according to the present invention, and FIG. 2 (B) is Same side view, Figure 3 (a), (b) and Figure 4 (a), (
B) is an explanatory diagram of the formation process of a turbulence promoter, and FIG. 5 is a side view showing another example of a turbulence promoter. rotor body, 3: sliding friction part (of the rotor), 3a:
fin, 4: ventilation hole, 4 &: reduced diameter part, 4b: first air intake port, 4C: second air intake port, 4d: third air intake port,
5, 5': Turbulence promoter, 5a, 5a
', 5m'', 5/': Locking piece part 15b, 5b', 5♂,
5b": Feather, 5o: Thin metal plate, 5o&: Projection, 5ob
= Feather part. Representative Patent Attorney 1) Li 2 Figure 2 (a) ([l) b Figure 5 5' Figure 3 Figure 4 (b)

Claims (1)

[Claims] 1. A radial ventilation hole is provided inside the rotor, a reduced diameter part with an air intake is formed on the side wall of the ventilation hole, and a diameter-reduced part with an air intake port is formed on the tip side of the reduced-diameter part, extending obliquely in the axial direction of the ventilation hole. A ventilated rotor characterized by a fixed turbulence blow motor with extending wings.