FR2483029A1 - ROTOR WITH VENTILATED DISC BRAKE - Google Patents

Abstract

THE INVENTION RELATES TO A ROTOR WITH A VENTILATED DISC BRAKE. ACCORDING TO THE INVENTION, IT INCLUDES FIRST AND SECOND DISCS 2, 3 HAVING RESPECTIVE ENGAGEMENT WALLS 2A, 3A ON THEIR EXTERNAL SIDE AND AN OPENING AT THEIR CENTRAL PART; OF THE MAIN RIBS 4 EXTENDING BETWEEN THE FIRST AND SECOND DISCS IN CIRCUMFERENTIAL DIRECTION OF THE ROTOR, AN AUXILIARY RIB 10 BEING PLACED PARTLY IN RADIAL DIRECTION ABOVE THE MAIN RIB AND OR THE AUXILIARY RIB THAT IS FACED BY IT WHERE THE RESISTANCE OF THE ROTOR CAN BE INCREASED. THE INVENTION APPLIES IN PARTICULAR TO THE BRAKING OF VEHICLES.

Description

The present invention relates to a brake rotor

to disc wind ilé.

  A ventilated disk brake is used to brake a rotating member such as a rotor that rotates in response to the rotation of one or more wheels by pressing it between two pads, as in a conventional disk brake. The ventilated disk brake has air flow passages, so heat generated by friction between the rotor and the pads can radiate through a number of cooling ribs that extend

  radially between two walls in engagement of the rotor.

  Figures 1 (A) and (B) show a traditional ventilated disc brake. A rotor 1 has first and

  second discs 2, 3 having a wall. respective undertakings

  2a, 3a on which two pads (not shown) are respectively pressed. The first and second discs 2, 3 are joined by a number of ribs 4 which extend radially between the walls 2a, 3a. The first disc 2 has, in its central part, an opening 5 through which is inserted a shaft rotating a wheel (not shown). Along the opening 5, a number of orifices 6 are formed in the inwardly projecting edges of the first disk 2. An opening 7 is formed in the central portion of the second disk 3. When the wheel is rotating , the air flows between the ribs 4 in response to the rotation of the rotor 1, and the heat produced by friction between the pads and the walls 2a, 3a of the rotor 1 in the case of braking can be radiated for the cooling. Thus, one can pocket the phenomenon of the vapor plug to occur in the fluid that makes

run the skates.

  However, in such a rotor, the ribs 4 are radially arranged only considering the air flow characteristics. As a result, the stiffness or resistance in the radial direction of the engagement walls of the rotor 1 are not considered, so this rotor can vibrate during braking or when the pads are engaged. Therefore, a resonance phenomenon can easily occur. produce in the rotor, with braking noises

when you brake.

  According to the present invention, a ventilated disk brake comprises not only ribs extending radially between two rotor engaging walls, but also

  a number of ribs which are arranged in direct

  circumferential circumference of the rotor in order to increase or improve the rigidity or resistance thereof

circumferential direction.

  Therefore, the subject of the present invention is a

  ventilated disc brake to eliminate

  ventilated disc brakes according to the prior art, in order to prevent braking noises from occurring at

a reasonable extent.

  The invention will be better understood and other purposes, features, details and advantages thereof

  will appear more clearly in the description

  explanatory document which will follow with reference to the accompanying schematic drawings given solely by way of example illustrating several embodiments of the invention and in which: - Figure 1 (A) is a schematic front view showing a disc brake rotor traditional; Figure 1 (B) is a sectional view of the rotor taken along the line II-II of Figure 1A; FIG. 2 is a sectional view showing an essential part of a disk brake rotor according to a preferred embodiment of the invention; Fig. 3 (A) is a sectional view showing a portion of another form of rib according to the invention; Figure 3 (B) shows another form of ribs according to the invention; FIG. 4 is a sectional view showing another embodiment of the invention; and FIG. 5 is an explanatory view showing

  uniformly distributed resonant waves which are

tent in a traditional rotor.

  Identical or corresponding members or parts are designated by the same reference numerals as in FIGS. 1 (A)

  and (B) which show the rotor according to the prior art.

  Referring to Figure 2, a rotor 1 includes first and second disks 2, 3 with their respective engagement walls 2a, 3a on their outer side. With the exception of the shapes and arrangements of the ribs, the rotor 1 is substantially identical to that of FIGS. 1 (A) and (B),

  it will not be described in detail.

  A number of main ribs 4 extend radially between the engagement walls 2a, 3a of the discs 2, 3 at the same intervals as in the conventional rotor. In addition, a number of auxiliary ribs 10 are arranged between the walls 2a, 3a in the circumferential direction of the rotor 1. Although the auxiliary ribs 10 may be formed separately from the main ribs 4, it is preferable that each main rib 4 be joined. at one end to the center of each auxiliary rib 10 to form a T.

  FIG. 2, the auxiliary ribs 10 are joined alternately

  At the inner and outer ends of the radially fixed main ribs 4, a T-joint of the main and auxiliary ribs 4 and 10 is adjacent to an adjacent main and auxiliary reverse T-shaped combination. A combination of main and auxiliary ribs is separated from another

  combination of main and auxiliary ribs

  from the same distance. Therefore, passages

  zig-zag air flow are formed among the combinations of

  main and auxiliary ribs In such an arrangement of the main and auxiliary ribs the stiffness and strength of the walls 2a and 3a can be

  increased on their internal and external perimeters.

  All the auxiliary ribs 10 joined to the outer end of the main ribs 4 have the same length and are arranged at the same intervals with the same pitch. Similarly, all the auxiliary ribs 10 joined to the inner ends of the main ribs 4 have the same length and are arranged at the same intervals with the same pitch. As a result, the rigidity and resistance of the rotor 1 are uniform in any position around the periphery thereof, so that the rotor 1 can not resonate with the pads, the

  jaw and body of the vehicle (not shown).

  In operation, the pads are pressed on the walls 2a, 3a of the rotor 1, making it vibrate, but this vibration of the rotor 1 can be remarkably reduced thanks to its improved rigidity and strength. Similarly, the resonant frequency of the rotor 1 is studied to be different from that of the pads, the jaw and the body of the vehicle. Consequently, the natural uibrations of the rotor 1 do not increase, which avoids the

braking noises.

  Figures 3 (A), (B) and (C) show three different forms of auxiliary rib - main rib combinations. In Figure 3 (A), a main rib 4 is attached

  to an auxiliary rib 10 to form an L. A combination of

  L-shaped section of the main and auxiliary ribs is adjacent

  to an inverted L combination of main and auxiliary ribs, in a continuous manner although only one

part is represented.

  In Fig. 3 (B), a main rib 4 is joined to auxiliary ribs 10 to form a Z. In Fig. 3 (C), a main rib 4 is joined to auxiliary ribs 10 to form an I.D. Other forms of main and auxiliary ribs in combination may be employed if the main ribs are arranged radially of the rotor 1 and the auxiliary ribs are arranged in the circumferential direction thereof. The air must flow in such a combination of main and auxiliary ribs

  to radiate heat into the atmosphere.

  It will also be appreciated that according to the present invention, at least partially, the auxiliary ribs of a combination are radially positioned or overlapped with the main and / or auxiliary ribs of the adjacent combination, thus the rigidity and resistance of the rotor 1

  are reasonably increased and improved. It is preferable

  only the rotor ribs, the auxiliary ribs 10 are placed partially on the auxiliary and / or main ribs of the radially adjacent combination of the rotor, although the present invention

  is not limited to such an embodiment.

  Figure 4 shows another embodiment of the present invention. The circumferentially arranged or circumferentially extending auxiliary ribs 10 of the rotor 1 are formed only in a number of separate parts thereof. Parts where the stiffness or strength of the rotor 1 are increased constitute the groups G 0 are

  formed the auxiliary ribs 10 in circumferential direction

  The groups G are separated from one another by a distance 1. Each group G is composed of three adjacent main ribs 4 ', 4 "and three auxiliary ribs 10 joined to the respective main ribs 4'. , 4 "according to a T. An auxiliary rib 10 is joined at its center to the inner end of the main rib 4", and the other auxiliary ribs 10 are joined to the outer ends of the main ribs 4 ', 4' on both sides rib

central auxiliary 4 "1.

  It is preferable that groups G are placed

  at the same intervals along the periphery of the discs 2, 3.

  In FIG. 4, three main ribs 4 are arranged at the same intervals between the groups G. In use, it is possible to pocket the uniformly distributed resonance waves of the rotor 1 to occur

during braking.

  If the rigidity is uniform all around the rotor, as shown in Figure 5, resonance waves uniformly distributed as a sinusoidal curve "e" can occur at the rotor. If such uniformly distributed resonant waves occur, then the damping performance of the oscillations of the rotor 1 is decreased. As a result, the braking noises can

sometimes happen.

  In contrast, in the embodiment shown in Figure 4, the stiffness and resistance of the rotor 1 in the circumferential direction are not only increased but also different at various given points of the periphery. Thus, the rotor 1 does not resonate with other organs such as the brake pads, the jaw and the body of the vehicle. On the other hand, evenly distributed resonant waves can be prevented from occurring at rotor 1, so the damping performance of oscillations of rotor 1 can be increased to avoid

perfectly the braking noise.

  The number of groups G is preferably a number

first.

  Each combination of main and auxiliary ribs is T-shaped in FIG. 4, but other shapes of main and auxiliary ribs in combination can be used as FIGS. 3 (A), (B) and (C) if the ribs radially extending from the rotor and that the auxiliary ribs extend into

  circumferential direction thereof.

  Of course, the invention is not limited to the embodiments described and shown which have been given by way of example. In particular, it includes all the means constituting technical equivalents of the means described and their combinations, if they are executed according to its spirit and implemented in

  the framework of protection as claimed.

Claims (5)

REVENDICATI 0 N S   A ventilated disc brake rotor characterized in that it comprises: first and second discs (2, 3) having respective engagement walls (2a, 3a) on their outer side and an opening formed therein plant; a number of main ribs (4) extending between the first and second disks radially of said rotor; and   a number of auxiliary ribs (10) extend   between the first and second discs in the circumferential direction of said rotor, an auxiliary rib being placed partially radially on the main rib and / or the auxiliary rib adjacent thereto so that the stiffness or   resistance of said rotor can be increased.   2. Rotor according to claim 1, characterized in that the aforementioned auxiliary ribs are placed in selected parts of the entire periphery of said rotor so that the rigidity or strength of said rotor is not not uniform at its periphery.   Rotor according to one of the claims   1 or 2, characterized in that the aforementioned auxiliary ribs are joined to the main ribs to form T.   4. Rotor according to any one of claims 1   or 2, characterized in that the aforementioned auxiliary ribs are joined to the main ribs to form ds L.   Rotor according to any one of claims 1 or   2, characterized in that the aforementioned auxiliary ribs are joined to the main ribs to form Z.   6. Rotor according to any one of claims 1   or 2, characterized in that the aforementioned auxiliary ribs are alternately joined to the outer and inner ends of the main ribs along a T, one after the other, so that an air flow pitch can be formed among the ribs main and auxiliary in combination,