A Rotor for Anti-Lock Brake System FIELD
The present subject matter relates to a braking system. More particularly it is relates to an improved rotor design for wheel speed sensing mechanism which eliminates the need of separate pole wheel or toner ring in the vehicles.
BACKGROUND
A vehicle anti-lock braking system (hereinafter referred as "ABS") is a kind of safety device that detects a change in speed of a rotating wheel during emergency braking and prevents lock-up of the wheel (in a state where the wheels are completely stopped while the vehicle is still moving).
Wheel speed sensing is requirement for ABS/Electronic Stability Control (hereinafter referred as ESC). Particularly wheel speed sensing is done with use of pole wheel/toner ring mounted on wheel hub or brake rotor either integrated or separately mounted.
Generally these pole wheel or ■toner ring has got rectangular slots or rectangular extrusion and speed is sensed by sensor with magnetic rays rate cutting extrusions of pole wheel and providing electrical signal. In conventional sensing mechanism separate pole wheel or toner rings are used which is an additional part of the system, either they have extrusions or rectangular slots, thereby it may incur additional cost on the system. Sometimes rectangular extrusions are also integrated in brake rotors or hub. One more disadvantage of it is machining for rectangular slot as well as rectangular extrusions are difficult and more time consuming. Further the teeth profile of pole wheel or toner ring may not aligned with the hub or axle, thereby it would difficult to get the accuracy in the system.

In order to eliminate machining for rectangular slots and rectangular extrusions for a pole wheel or toner ring there is an unmet need of a system, which may eliminates above disadvantages.
OBJECT
An object of the present subject matter is to provide an improved rotor design which is incorporated with circular holes and thereby eliminating machining which includes difficult rectangular slots or extrusions.
Another object of the present subject matter is replacement of pole wheel or toner ring with symmetric holes on step or on to the surface of brake rotor drilled in single setup.
Yet another object of the present subject matter is elimination of the interference fit assembly process of toner ring or pole wheel with wheel hub or brake rotor.
Further object of the present subject matter is to eliminate pole wheel or toner ring as an additional part for wheel speed sensing in ABS and thereby reducing the cost of the system.
Still further object of the present subject matter is to avoid local deformation of pole wheel in high heat effective zone of braking.
BRIEF DESCRIPTION
Although the subject matter is explained with the help of an example of brake system, particularly brake system comprises rotor having a uniformly hole around the rotor surface, by which sensing of anti-braking system is done. The rotor is having holes in such a manner that sensor get actuated and thereby works as an anti-braking system

sensing mechanism. However, it shall become abundantly clear after reading this specification, that the subject matter may, without departing from the spirit and scope of the subject matter, also be applied to variation in embodiments having rotor system or other similar devices.
The present subject matter discloses a braking system and method of manufacturing thereof. Particularly the braking system employed a rotor having uniformly holes across the center to sense the wheel speed by sensor, which is required in an anti-braking system and a method of manufacturing thereof are provided. The rotor having homogenous hole across the border of rotor act a part of sensing mechanism to monitor and control the speed of the wheel. The braking system comprising a rotor having symmetric circular holes configured on step or on to the surface of brake rotor; a sensor to sense the speed of wheel through holes during vehicle running, wherein the rotor is being characterized by replacing the pole wheel or toner through symmetric hole pattern of rotor.
DRAWINGS
Figure 1 shows an exploded view of a conventional brake system.
Figure 2 shows an exploded view of a brake system, in accordance with the present
subject matter.
Figure 3 shows a surface view of a brake rotor, in accordance with the present subject
matter.
Figure 4 shows a side/isometric perspective view of a brake rotor, in accordance with
the present subject matter.
DETAILED DESCRIPTION
The foregoing objects of the present subject matter is accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are

overcome by the present subject matter as described below in the preferred
embodiments.
The present subject matter provides an improved rotor system in brake system of
vehicles which is incorporated with symmetric circular holes configured on step or
on to the surface side of brake rotor and eliminating the pole wheel or toner ring as
an additional part for wheel speed sensing in ABS and thereby reducing the cost of
the system.
In another embodiment, the present subject matter provides a braking system
comprising a rotor having symmetric circular holes configured on step or on to the
surface side of brake rotor; a sensor to sense the speed of wheel during vehicle
running condition.
In another embodiment, the present invention provides a method of manufacturing
thereof.
Referring now to figure 1, there is shown an exploded view of a conventional brake system (100). The brake system (100) includes a wheel hub (101), a brake rotor (103), a pole wheel (105), an adaptor plate (107), a stud axle flange (109), a stub axle (111) and a caliper (113).
The wheel hub (101) is a part of the brake system (100) in vehicles which is located at the surface and rear wheel axles. The wheel hub (101) is a cylindrical shell and is preferably made from a section of steel tubing. The wheel hub (101) includes an axial body in the form of a central cylinder with a radial mounting flange on one end having a plurality of mounting apertures therein and a rotor support flange on the other end. The rotor support flange extends outwardly from cylinder and has an outward end that is radially spaced from the central cylinder. The outward end of the rotor support flange is an annular ring that extends around the central cylinder and presents a radial face for mounting the brake rotor (103) thereon.

The brake rotor (103) is a circular plate which is detachably attached to the wheel hub with the help of fasteners. The pole wheel (105) a ring like structure having plurality of rectangular slots or rectangular extrusion mounted on rotor. These rectangular slots or extrusions are associated with the sensing of the wheel speed. The adaptor plate (107) is provided for holding the caliper (113). There is provided a stub axle (111) having a stub axle flange (109) which holds the sensor in place.
Referring now to figure 2 there is shown an exploded view of a brake system (200), in accordance with the present subject and different views of a brake rotor (203)
respectively.
The brake rotor (203) is provided with symmetric holes on step or on to the surface side of the brake rotor (203) as shown in fig. 3 and 4 which is mounted on the wheel hub (201) with the help of fasteners. The brake rotor (203) eliminates the need of pole wheel (not available in FIG. 2) and thereby, reduces cost of the system along with complexity.
FIG. 3 illustrates the surface portion of the brake rotor 300 comprising symmetric holes 301 on step or on to the surface side of the brake rotor.
FIG. 4 shows the braking system 400 having surface plate comprising symmetric holes 401 on step or on to the surface side of the brake rotor.
In an operation, the system (200) works as follows: *
The system (200) refers to brake system module in which caliper (211) contains a brake pad (not shown) which acts on the braking surface of the brake rotor (203) during braking operation. The brake rotor (203) is mounted on the wheel hub (201) so that during braking wheel stops. Vehicle with ABS system needs to be incorporated with wheel speed sensing mechanism. The wheel speed sensor (not shown) is mounted on the flange (207) of stub axle (209) and sensor sensing face

comes in surface of the pole wheel (105) in conventional rotor/ circular hole pattern (213,301 & 401) as mentioned in FIG.2, FIG. 3 & FIG. 4. When the brake rotor (203) rotates, rotational speed is sensed by wheel speed sensor and output is provided to ABS ECU continuously.
ADVANTAGES
1. The present subject matter eliminates pole wheel or toner ring as an additional part for wheel speed sensing in ABS.
2. The present subject matter is simple in design, easy to operate, mobile, reliable and durable.
3. Local deformation of pole wheel can be avoided in high heat effective zone during panic braking.
4. The present subject matter provides cost benefits as the assembly with interference fit of pole wheel/toner ring with brake rotor or hub is eliminated, and also pole wheel part is eliminated with replacement of holes on face or step in one setup.
The foregoing descriptions of specific embodiments of the present subject matter have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present subject to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present subject matter and its practical application, to thereby enable others skilled in the art to best utilize the present subject matter and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present subject matter:

What is claimed is:
1. A braking system comprising
a) a rotor having symmetric circular holes configured on step or on to the surface of brake rotor; and
b) a sensor to sense the speed of wheel through holes in a vehicle running condition.
wherein the rotor is being characterized by replacing the pole wheel or toner through symmetric holes of rotor.
2. The braking system as claimed in claim 1, wherein the systematics circular holes is being developed by drilling operation in single setup, with multi spindle drilling setup.
3. The braking system as claimed in claim 1, wherein said symmetric circular holes of the rotor is being configured to engage with sensor.
4. The braking system as claimed in claim 1, wherein said sensor is configured to engage with symmetric circular holes.
5. A method of manufacturing braking system as claimed in claim 1 comprising:

a) a rotor having symmetric circular holes configured on step or on to the surface of brake rotor; and
b) a sensor to sense the speed of wheel through holes in vehicle running condition
wherein the rotor is being characterized by replacing the pole wheel or toner through symmetric holes of rotor.

5. A method of manufacturing braking system as claimed in claim 4, wherein the systematics circular holes is being developed by drilling operation in single setup, with multi spindle drilling setup.
6. The method of claim 4, wherein said symmetric circular holes of the rotor is being configured to engage with sensor.
7. The method of claim 4, wherein said control unit comprises a sensor, a microcontroller, a circuit assembly and a relay.