FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"System for Cooling Brake Assembly of Vehicle"
2. APPLICANT:
a. NAME: MAHINDRA & MAHINDRA LIMITED
b. NATIONALITY: Indian Company registered under the provisions of
the Companies Act-1956.
c. ADDRESS: R&D Center, Automotive Sector, 89,
M.LD.C, Satpur, NASHIK - 422 007 Maharashtra State, India
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

System for Cooling Brake Assembly of Vehicle
Field of the invention
The present invention relates to a heat dissipation mechanism for a vehicle, and more particularly, to a system for cooling a brake assembly of the vehicle.
Background of the invention
Automobiles play a major role in today's world. In every automobile, there are many systems or components which generate heat when a vehicle is in motion. Heat generation if not properly taken care of or cooled by some means results in decreasing efficiency of the systems over a period of time which in turn affects the overall performance of the vehicle. One such system wherein the heat gets generated in vehicles is the braking system. Braking system accumulates heat during application of brakes and needs to be cooled faster for improved performance of the vehicle.
Many attempts have been made in the past for effective cooling of the brake system of the vehicle. For example, in the US Patent 7097010 BL a brake disc for a vehicle disc brake comprising a radially inner hub portion, intended to be non-rotatably joined to a wheel hub. and a surrounding, radially outer disc portion with opposing friction surfaces is disclosed. The outer disc portion is formed by two disc elements joined to the hub portion, and which are separated by spacers, which define passages for cooling air and of which at least some are in the form of fan vanes to generate an airflow from the passage inlets at the outer periphery of the disc to the passage outlets at the outer periphery of the disc.
Another US Patent No. 4596312A discloses a shielded disc brake system for motorcycles having structure for inducing radial air flow past the brake disc. The

device includes an annular passageway between the hub and the shield which may include a centrifugal fan positioned therein. The fan may include passageways between vanes longitudinally aligned with radial passages in the brake disc. The disc itself is mounted about its periphery on bosses extending from the hub. The fan is then bolted to the ends of the bosses to retain the disc from axial movement away from the bosses.
Yet another US Patent No. 2489522A discloses a brake drum cooling and silencing device having a fan mounted on the drum for circulating air to cool the drum brake.
Still another US Patent No. 2687192A discloses a wheel brake cooling device comprising an air scoop, a brake drum mounted forced feed fan and a wheel cover mounted suction fan wherein the air transfer units are associated such that each cooperates with the other to improve the brake cooling effect and thereby the capacity, operability and life of the brake.
One more US Patent No. 2761530A discloses a device for cooling the brake drum of a motor vehicle wheel brake or the like. More particularly, the invention involves incorporation of a fan driven air circulating and heat dissipating system in a conventional wheel assembly in a manner whereby brake generated heat is effectively dissipated such that vastly improved braking action is achieved. This invention, in several of its disclosed forms, comprises a plate like fan element and a plate-like wheel cover element each of which elements are separately and detachably connectible to a conventional wheel disc, in another form of the invention, the wheel cover and the fan element are combined to form a unitary structure that is simple in design and most economical to manufacture.
Another US Patent No. 2633944A discloses brake drum cooling with a finned ring that may be mounted about the periphery of a brake drum to readily dissipate the heat

therefrom and to further serve as a vibration damping device to reduce and/or eliminate various types of braking noise.
In yet another US Patent No.8333438B2 a ventilated wheel assembly is disclosed which includes a wheel having an axis X-X; and a system for braking the wheel, in which a fan is arranged in order to cool the braking system. The rotor of the fan is formed by a hub and a plurality of blades which rotate about the axis (X-X') of the wheel and has a wall. The rotor of the fan comprises a rotating collar which connects the outer radial ends of the blades, so that an operational clearance is provided between the wall of the air circulation channel and the collar.
The brake cooling systems of the prior art either involve mounting the cooling fan rigidly on the disc/drum brake or the fan is detachable from the braking system with some air passage for cooling the brakes. The brake cooling systems of the prior art do not result in effective cooling and are manufactured by complex processes using complex parts.
Accordingly, there is a need of a simple and efficient brake cooling system that overcomes the drawbacks of the prior art.
Objects of the invention
An object of the present invention is to provide a simple and efficient cooling of a brake assembly of a vehicle.
Another object of the present invention is to improve cooling rate of the brake assembly by maintaining rotation of a cooling device even if brake rotation is decelerated.

Summary of the invention
Accordingly, the present invention provides a system for cooling a brake assembly of a vehicle. The brake assembly includes a brake unit, for example, a drum type or a disc type of brake unit adapted to rotate therein. The brake unit includes an inner surface and an outer surface. The inner surface is provided with a plurality of vent holes on a circumference thereof for allowing an air flow therethrough. The system comprises a first filter and a housing. The first filter is mounted on an outer periphery of the housing and adapted to provide fresh air. The housing is mounted on the outer surface of the brake unit. The housing includes at least two bearings, a cooling device and a second filter.
The cooling device is positioned between the bearings. The cooling device is adapted to receive air from the first filter and rotate continuously in the direction of rotation of the brake unit. The cooling device includes a radial small balanced mass for undergoing continuous rotation and an interior locking device for rotation in the direction of the brake unit. The second filter is positioned on a side of the cooling device and adapted to provide dust free air to the brake unit via the vent holes.
Wherein, when the brake assembly is operated to slow the movement of the vehicle. the rotation speed of the brake unit decreases generating heat therein whereas the cooling device continues to rotate at the same speed receiving fresh air through the first filter and passing the cooled air to the second filter that retains dust particles from the air and provides the brake unit with dust free air that continuously moves out of the brake unit through the vent holes dissipating out heat therefrom thereby resulting in cooling of the brake assembly.
Brief description of the drawings

The objectives and advantages of the present invention will become apparent from the following description read in accordance with the accompanying drawings wherein,
Figure 1 shows a side perspective view of a brake assembly showing a brake unit and a system cooling the brake assembly, in accordance with the present invention;
Figure 2a shows a cut section of a drum type brake unit of the brake assembly of figure 1;
Figure 2a shows a cut section of a disc type brake unit of the brake assembly of figure 1;
Figure 3 shows a schematic view of the system for cooling the brake assembly for the drum type brake unit, in accordance with a first embodiment of the present invention;
Figure 4 shows a schematic view of the system for cooling the brake assembly for the disc type brake unit, in accordance with a second embodiment of the present invention; and
Figure 5 shows a schematic view of a balanced proof mass and a locking device of the system of figure 4.
Detailed description of the invention
The foregoing objects of the invention are accomplished and the problems and shortcomings associated with the prior art techniques and approaches are overcome by the present invention as described below in the preferred embodiment.

The present invention provides a system for cooling a brake assembly of a vehicle. The system of the present invention uses the principle of air suction through a speed differential phenomenon. The system is simple and causes efficient cooling of the brake assembly. The system improves the cooling rate of the brake assembly by maintaining rotation of a cooling device even if the rotation of a brake unit is decelerated.
This present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in bracket in the following description.
Referring now to figures l-2b, a brake assembly (200) for a vehicle, in accordance with the present invention is shown. The brake assembly (200) comprises a brake unit (150) adapted to rotate therein and a system for cooling the brake assembly (100) (hereinafter 'the system (100)'). The brake unit (150) includes an inner surface (120) and an outer surface (130). The inner surface (120) is provided with a plurality of vent holes (128) on a circumference thereof for allowing an air flow therethrough for cooling purpose. In an embodiment, the brake unit (150) can be a drum type brake unit (150A) (refer to figure 2a) or a disc type break unit (150B) (refer figure 2b).
Referring now to figures 3-5, the system (100) for the brake assembly (200) in accordance with the present invention is shown. Specifically, the system (100) for drum type brake unit (150A) in accordance with a first embodiment of the present invention is shown in figure 3. The system (100) comprises a first filter (90) and a housing (80). The first filter (90) is mounted and fixed on an outer periphery of the housing (80) by any suitable means known in the art. The first filter (90) is a small air inlet filter adapted to provide fresh air to the brake unit (150) through the housing (80). The housing (80) is mounted on the outer surface (130) of the drum type brake unit (150A) by any suitable means known in the art. The housing (80) includes at

least two bearings (10). a cooling device (20) and a second filter (30). In an embodiment, the housing (80) is a gadget that can be made of metals such as aluminum, magnesium, steel, titanium, nickel, alloys thereof and carbon based composite materials, wood based materials, fabric based materials, glass based materials, polymeric based materials and the like. The drum type brake unit (150A) and the cooling device (20) are made up of materials selected from any of a cast iron, aluminum based alloy and composite materials, copper based alloys and composite materials, titanium based alloys and composite materials, ceramic based composite materials, carbon based composite materials, magnesium based composite materials, nickel based alloys and composite materials.
The bearings (10) are a low friction roller bearing. However, it is, understood, that the bearings (10) can be ball bearings, journal bearings and the like. The bearings (10) are mounted with the cooling device (20) by any suitable means known in the art. Specifically, the cooling device (20) is positioned between the bearings (10). The cooling device (20) is adapted to receive air from the first filter (90). The cooling device (20) is provided with a pair of radial small balanced proof mass (50) and at least two interior locking devices (60) (refer figure 5). The radial small balanced proof mass (50) allows the cooling device (20) to rotate continuously irrespective of the rotation speed of the drum type brake unit (150A), The locking devices (60) are located on the periphery of the cooling device (20) close to the bearings (10). The locking device (60) causes the cooling device (20) to rotate only in the direction of the rotation of the brake unit (150A) by preventing/locking rotation in the reverse direction. In an embodiment, the cooling device (20) is a radial fan or a ring fan.
The cooling device (20) on a side is attached with the second filter (30) by any suitable means known in the art. The second filter (30) receives cooled air from the cooling device (20), retains dust particles from the air and passes dust free air into the drum type brake unit (150A). Further, the dust free air moves out from the drum type

brake unit (150A) via the vent holes (128A) dissipating heat therefrom. In an embodiment, the second filter (30) is a radial filter.
In an operation of the brake assembly (200) to slow the movement of the vehicle, the rotation speed of the brake unit (150A) retards generating heat. The reduced speed of the brake unit (150A) does not decrease the rotation speed of the cooling device (20). As a result, the cooling device (20) keeps rotating at the same speed resulting in a difference in the rotation speed of the brake unit (150A) and the cooling device (20). The speed difference causes the cooling device (20) to suck fresh air from the first filter (90) and purge the air on the second filter (30). The second filter (30) passes air without ingress of dust particles into the brake unit (150A). The dust free air from the brake unit (150A) continuously moves out through the vent holes (128A) carrying along heat from the brake unit (150A) thereby cooling the brake assembly (200).
Referring now to figures 4 and 5, the system (100) for the disc type brake unit (150B) in accordance with a second embodiment of the present invention is shown. The system (100) for the disc type brake unit (150B) is structurally and functionally similar to the system (100) of the drum type brake unit (150B) and hence not described herein again for the sake of brevity of the invention. The cooling device (20) is mounted on the bearings (10) concentric to a hub (40) by any suitable means known in the art.
Advantages of the present invention
• The cooling system (100) maintains a differential speed between the brake unit (150) and the cooling device (20) to allow faster air suction thereby improving the cooling efficiency and performance of the vehicle's brake assembly (200).

• The cooling system (100) helps to stabilize a rotor temperature, avoids overheating of calipers and pads and boiling of brake fluids thereby preventing brake fading and improving the life span of the brake assembly (200).
• The cooling system (100) is installed on the brake unit (150) of both the drum type (150A) and the disc type (150B) with minimal modifications for effective cooling.
The foregoing objects of the invention are accomplished and the problems and shortcomings associated with prior art techniques and approaches are overcome by the present invention described in the present embodiment. Detailed descriptions of the preferred embodiment are provided herein; however, it is to be understood that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure, or matter. The embodiments of the invention as described above and the methods disclosed herein will suggest further modification and alterations to those skilled in the art. Such further modifications and alterations may be made without departing from the spirit and scope of the invention.

We Claim:
1. A system for cooling a brake assembly of a vehicle, the brake
assembly having a brake unit adapted to rotate therein, the brake unit having an inner
surface provided with a plurality of vent holes on a circumference thereof for
allowing air flow therethrough and an outer surface, the system comprising:
a first filter adapted to provide fresh air; and
a housing mounted on the outer surface of the brake unit, the
housing having the first filter mounted on an outer periphery thereof, the housing
including
• at least two bearings,
• a cooling device positioned between the bearings, the cooling device having at least two interior locking devices and a radial small balanced proof mass, the cooling device adapted to receive air from the first filter,
• a second filter positioned on a side of the cooling device, the second filter adapted to provide dust free air to the brake unit via the vent holes,
Wherein, when the brake assembly is operated to slow down movement of the vehicle, rotating speed of the brake unit decreases generating heat therein whereas the cooling device continues to rotate at the same speed receiving fresh air through the first filter and passing the cooled air to the second filter that retains dust particles from the air and provides the brake unit with dust free air that continuously moves out of the brake unit through the vent holes dissipating out heat therefrom thereby resulting in cooling of the brake assembly.
2. The system of claim 1, wherein the locking device is adapted to rotate
the cooling device only in the direction of the rotation of the brake unit and prevent
rotation of the cooling device in the reverse direction.

3. The system of claim 1. wherein the small balanced proof mass is adapted to maintain the cooling device in continuous rotating motion.
4. The system of claim 1. wherein the cooling device is selected from any one of a radial fan and a ring fan.
5. The system of claim 1. wherein the cooling device is mounted on the bearings concentric to a hub.
6. The system of claim 1, wherein the bearing is a low friction roller bearing.
7. The system of claim 1. wherein the brake unit is any one of a drum type brake unit and a disc type brake unit.