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EP-3947063-B1 - DISK BRAKE ASSEMBLY

EP3947063B1EP 3947063 B1EP3947063 B1EP 3947063B1EP-3947063-B1

Inventors

  • RAVILLA, PRASAD
  • K MATHEWS, Winney
  • MOHAN, Shanmugam
  • VENKATA MANGA RAJU, Karnam
  • RAJPUT, BHARAT ARAVIND

Dates

Publication Date
20260506
Application Date
20200331

Claims (10)

  1. A saddle type vehicle (1) comprising: an axle holder (28); an axle shaft (21), said axle shaft (21) fitted in said axle holder (28); a wheel hub (29a); a disc brake assembly (2), said disc brake assembly (2) capable of applying braking on a wheel (24); said disc brake assembly (2) including: a brake disc (10), said brake disc (10) being mounted on said wheel hub (29a); a caliper (23); and a brake pad (50), said brake pad (50) having a friction member adapted to press against an area of contact on said brake disc (10) for stopping rotational motion of said wheel (24), said brake pad (50) being mounted on said caliper (23); wherein said area of contact on said brake disc (10) being provided with a plurality of set of oval slots (30a, 30b, 30c), wherein said friction member of said brake pad (50) being pressed on said plurality of set of oval slots (30a, 30b, 30c); each slot (30a, 30b, 30c) of said plurality of set of oval slots (30a, 30b, 30c) having a major axes (a1, a2, a3), said major axis (a1, a2, a3) being disposed at a predetermined angle (α, β, and γ); each slot (30a, 30b, 30c) of said plurality of set of oval slots (30a, 30b, 30c) being located at a predetermined diameter (D1, D2, and D3), wherein said predetermined diameter (D1, D2, D3) being from a rotary centre (P) of said brake disc (10); and said brake disc (10) being provided with a plurality of petal notches (310 to 319) at an outer periphery of said brake disc (10), characterized in that said plurality of set of oval slots (30a, 30b, 30c) comprising a first oval slot (30a), a second oval slot (30b) and a third oval slot (30c), each slot (30a, 30b, 30c) of said plurality of set of oval slots (30a, 30b, 30c) comprises two imaginary circles respectively, a first imaginary circle of said first oval slot (30a) has a first center (c1), a second imaginary circle of said first oval slot (30a) has a second center (c2), a first imaginary circle of said second oval slot (30b) has a third center (c3), a second imaginary circle of said second oval slot (30b) has a fourth center (c4), and a first imaginary circle of said third oval slot (30c) has a fifth center (c5), a second imaginary circle of said third oval slot (30c) has a sixth center (c6), and wherein a distance from said first center (c1) to the rotary center (P) of said brake pad is R1, a distance from said second center (c2) and said third center (c3) to the center (P) of said brake pad are both R2, a distance from said fourth center (c4) and said fifth center (c5) to the rotary center (P) of said brake pad are both R3 and a distance from said sixth center (c6) to the center (P) of said brake pad is R4, wherein the brake pad (50) comes in contact with said plurality of oval slots (30a, 30b and 30c) upon brake of said saddle type vehicle (1) being applied, and debris being collected by said plurality of oval slots (30a, 30b and 30c).
  2. The saddle type vehicle (1) as claimed in claim 1, wherein said predetermined angle (α, β, γ) being substantially equal to each other.
  3. The saddle type vehicle (1) as claimed in claim 1, wherein said predetermined angle (α, β, γ) being made by said major axes (a1, a2, a3) of each slot of said plurality of oval slots (30a, 30b, 30c) with a diameter of said plurality of predetermined diameter (D1, D2, and D3), said diameter defining position of said each slot (30a, 30b, 30c) of said brake disc (10), wherein said predetermined angle (α, β, γ) being in a range from 55 degrees to 65 degrees.
  4. The saddle type vehicle (1) as claimed in claim 1, wherein a depth of depression (D') created by said plurality of petal notches (310 to 319) being in range of thickness (t) of said brake disc (10).
  5. The saddle type vehicle (1) as claimed in claim 4, wherein said depth of said depression (D') created by said plurality of petal notches (310 to 319) being approximately equal to 1 to 1.25 times said thickness (t) of brake disc (10).
  6. The saddle type vehicle (1) as claimed in claim 5, wherein at least a portion of said area of contact not being covered by said plurality of slots (30a, 30b, 30c), being covered by said plurality of petal notches (310 to 319), said area of contact covered by said plurality of petal notches (310 to 319) having a width (W), said width (W) being equal to the depth of the depression (D').
  7. The saddle type vehicle (1) as claimed in claim 1, wherein said plurality of petal notches (310 to 319) forming an angle (A') with a diameter (D) of said brake disc (10), wherein said angle (A') being in a range of 70 degrees to 80 degrees.
  8. The saddle type vehicle (1) as claimed in claim 1, wherein length of said major axes (al, a2, a3) of said each set of said plurality of oval slots (30a, 30b, and 30c) being in said range of 1.5 to 2 times said length of a minor axis of said plurality of oval slots (30a, 30b, and 30c).
  9. The saddle type vehicle (1) as claimed in claim 8, wherein said length of said minor axis being equal to thickness (t) of said brake disc (10).
  10. The saddle type vehicle (1) as claimed in claim 1, wherein a predetermined angle (Θ) formed between said diameter (D1) and said diameter (D2) being equal to a predetermined angle (ψ) formed between said diameter (D2) and said diameter (D3) and wherein said angle (Θ, ψ) being in range of 8 degrees to 12 degrees.

Description

FIELD OF INVENTION The present subject matter relates generally to a saddle type vehicle. More particularly but not exclusively the present subject matter relates to a disc brake assembly for said saddle type vehicle. BACKGROUND For a saddle type vehicle, the increase in engine power, torque and vehicle weight increases the load on the brake system which ultimately needs to be designed for severe conditions and forces. Hence, the bigger discs are required for generating more torques which reduces the disc temperatures during braking compared to the smaller discs. An example of a saddle type vehicle with a disc brake assembly is shown in US2005092561A. As it is a known fact that the holes or slots provided in the disc helps in providing ventilation and dissipates the heat generated after applying brakes. Along with that, these perforations also helps to remove the glazed or blunt abrasive particles collected on the surface of the brake pad. There by, always the particles and debris generated due to friction while applying brakes, the particles comes into contact with disc and gets collected by these holes or slots when they comes into contact with the brake pad and eventually the collected debris falls off and provides smooth & sustained performance of the brakes. The holes or slots provided rubs against the entire pad without leaving any chord. But the holes or slots cannot be provided at the end of the disc due to manufacturing constraints. Practically the distance between the outer diameter of disc and starting point of the nearest hole or slot from the outer diameter of the disc should be at least equal to the thickness of the disc. Hence, the holes or slots alone cannot sweep the entire pad. The circumferential area between the periphery of disc and point from where the nearest slot or holes to the periphery of the brake disc remains untouched by the slots or holes and doesn't cover the brake pad in that area. This is due to the fact that the holes or slots are away from outer diameter by at least distance equal to thickness of the disc due to manufacturing constraints. BRIEF DESCRIPTION OF DRAWINGS The detailed description of the present subject matter is described with reference to the accompanying figures. Same numbers are used throughout the drawings to reference like features and components. Figure 1 illustrates a side view of the exemplary two-wheeled vehicle, in accordance with an embodiment of the present subject matter.Figure 2 illustrates a front isometric view of the front wheel and the disc brake assembly of the two-wheeled vehicle in accordance with an embodiment of the present subject matter.Figure 3 illustrates an isometric view of the brake disc of the two-wheeled vehicle in accordance with an embodiment of the present subject matter.Figure 4 illustrates a front view of brake disc of the disc brake assembly, in accordance with an embodiment of the present subject matter.Figure 5 illustrates an upper half sectional view of the brake disk and an enlarged view of the slots provided in the brake disc, in accordance with an embodiment of the present subject matter.Figure 6 illustrates sectional view of the essential part of the brake disc of the disc brake assembly in accordance with an embodiment of the present subject matter.Figure 7 illustrates an enlarged view of the essential part of the brake disc and the brake pad of the disc brake assembly in accordance with an embodiment of the present subject matter. DETAILED DESCRIPTION A Brake is a device which is used to create a frictional resistance. This resistance generated using the brake device is applied to a moving machine member in order to bring the moving machine member to bring to halt. In the entire process there is conversion of kinetic energy to heat and sound. The force of friction is generated between two parts, when it comes in contact. One is moving part and another is stationary. The ability to stop or braking power depends on the surface area of the frictional surfaces and the amount of force applied. Part of the heat generated during braking gets dissipated in the surrounding atmosphere and rest of the heat remains absorbed in the braking system for a certain period. A disc brake system is mounted on the wheel hub of the vehicle. The disc rotates along in the direction of wheel. The fluid from the master cylinder is forced into a caliper, where it presses against a piston. The piston then squeezes two brake pads against the brake disc which is attached to wheel, forcing it to slow down or stop. The brake disc is usually made up of steel and in some cases, made up of composites such as ceramic-matrix or carbon composites. The brake disc is connected to the wheel. In order to stop the rotational motion of the wheel, friction material in the form of brake pads is used. Brake pads are mounted on a device called caliper. Disk brake work on the principle of Pascal's Law or the Principle of transmission of fluid pressure i.e. press