FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION
Device For Measuring The Brake Disc Surface Temperature Of Vehicles In Dynamic Condition
APPLICANTS
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
Mr. Vinay H. Todkar and Mr. Bhalchandra P. Gogate
Both Indian Nationals of TATA MOTORS LIMITED,
an Indian company having its registered office
at Bombay House, 24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF INVENTION
This invention relates to device for measuring temperature and in particular device for measuring the brake disc surface temperature of vehicles in dynamic condition.
BACKGROUND OF INVENTION
Generally the brake disk surface temperature is measured by drilling the hole in the brake pads and putting the thermocouple inside the holes which measure the temperature of air and not brake disk surface temperature, actual surface temperature can not be measured because the thermocouple is not in contact with the surface of the brake disc, it measure the temperature of air surrounding the brake disc. Moreover by drilling the hole in brake pads, homogeneity of the said brake pad material is lost and due to wear of brake pad, thermocouple gets damaged. During development trials of brake system on the vehicles, the need was felt for continuous monitoring of the brake disc surface temperatures in vehicle running condition. The data was useful for designing the ventilation parameter, coefficient of expansion of the brake disc & analyzing the brake disc effectiveness with respect to rise in surface temperature. During homologation trials, it was required to know the brake disc surface temperature during objective trials like Fade test. Hence the device was made and fitted for monitoring of the brake disc surface temperature in vehicle dynamic condition.
OBJECTS OF THIS INVENTION
The main object of the present invention is to provide a device for measuring the brake disc surface temperature of vehicles in dynamic condition.
Another object of the present invention is to provide a device for measuring the brake disc surface temperature of vehicles in dynamic condition which will


help in assessing the brake system during development phase of the vehicles for designing of the expansion coefficient, ventilation parameter of the brake disc.
Yet another object of the present invention is to provide a device for measuring the brake disc surface temperature of vehicles in dynamic condition which is simple in construction and cost effective.
SUMMARY OF INVENTION
The present invention relates to a device for measuring the brake disc surface temperature of vehicles in dynamic condition comprises main support bracket, metal plate with adjusting screw & nut, spring steel strip , bush type thermocouple mounted on other end of said spring steel strip, wherein said main support bracket is rigidly fixed at first end on the vehicle structure, said metal plate with adjusting screw and nut is mounted on outer side at the second end of said main support bracket, said spring steel strip is mounted on inner side at second end of the main support bracket and said bush type thermocouple is fixed on the other end of the said spring steel strip such that it remains in contact with the brake disc surface.
Preferably, said bush type thermocouple, spring steel strip and sealing means are capable of withstanding temperature at least 500 deg C.
According to a preferred embodiment of the invention, said bush type thermocouple is maintained in contact with the brake disc surface with the said metal plate with adjusting screw and nut.
Preferably, said metal plate comprises group of hole for mounting adjusting screw and nut and bolts.

According to a preferred embodiment of the invention, said main support bracket comprises first and second end with mounting holes.
Preferably, said spring steel strip is flexible.
According to another embodiment of the invention, said adjusting screw and nut is spring loaded arrangement.
Most preferably, said sealing means used is of non conducting or insulating type sealing means.
BRIEF DESCRIPTION OF INVENTION
Device for measuring the brake disc surface temperature of vehicles in dynamic condition basically comprises of Main support bracket , metal plate with adjusting screw & nut , spring steel strip, bush type thermocouple. Said Main support bracket is adopted to be fitted on the stub axle, said metal plate with adjusting screw & nut is mounted on the said Main support bracket, said spring steel strip is mounted on other end of the Main support bracket, & said bush type thermocouple is fixed on the other end of the said spring steel strip with the help of M seal. Said thermocouple is made to remain in contact with the brake disc surface with the help of adjusting screw which is mounted on the said metal plate. Said thermocouple is interfaced with data acquisition system through cable . When the vehicle achieves the required speed, the trigger can be initiated through the data acquisition system to start the monitoring & recording of the brake disc surface temperature. The thermocouple being in touch with the brake disc records the surface temperature. The frequency of acquisition can be set manually as per the requirement through Data acquisition system fitted in the vehicle.

BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 - shows the main support bracket assembly.
Fig. 2 - shows main support bracket.
Fig. 3 - shows plate with adjusting scrtfw & nut.
Fig. 4 - shows assembly of spring steel strip on main support bracket.
Fig. 5 - shows assembly of complete (ievice in accordance with this invention
fitted on the vehicle stub axle.
DETAILED DESCRIPTION OF INVENTION
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same,
Referring to figures 1 to 5, the device comprises; Main support bracket (1), metal plate (2) comprises group of holes for mounting adjusting screw and nut (6) and nut and bolts (8), spring steel Strip (3) comprises holes at both end for mounting said spring steel strip on the said Main support bracket (1) and bush type thermocouple (4) mounted on the other end of said spring steel strip (3).
As shown in figures land 2 said main support bracket (1) comprises first end and second end wherein first end comprises hole for fixing the said main support bracket on the vehicle stub a*le (11) with the help of mounting bolt (12) and second end comprises at least two holes for mounting said metal plate (2) and spring steel strip (3). The said Main support bracket is placed in such a way that it straddle over the brake disc (10). Said metal plate (2) with adjusting screw and nut (6) is connected by inserting mounting bolts (8) on holes at the second end of the said main support bracket on the outer side. The one end of said spring steel strip (3) is mounted on inner side at second end of the said

main support bracket wherein said metal plate (2) is mounted on the outer side of said main support bracket.
Now said bush type thermocouple (4) is mounted at the other end (14) of said spring steel strip (3) with the help of sealing means (5). Said bush type thermocouple, spring steel strip and sealing means are capable of withstanding temperature at least 500 deg C is used. Said sealing means used is of non conducting or insulating type sealing means. The said spring steel strip is flexible to compensate the lateral run out of the said brake disc (10). The said Bush type thermocouple (4) is maintained in continuous contact with the brake disc surface with the help of adjusting screw & nut (6) arrangement on said metal plate (2). Said adjusting screw and nut is spring loaded arrangement.
Now referring to figure 5, when said device is mounted on the vehicle, said data acquisition system is triggered when vehicle achieves the desired speed which starts monitoring & recording of the brake disc surface temperature. The said thermocouple is in contact with the brake disc surface which is able to record the surface temperature. The thermocouple is interfaced with data acquisition system through cable (7).The frequency of acquisition can be set manually through Data acquisition system fitted in the vehicle.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.

WE CLAIM
1. A device for measuring the brake disc surface temperature of vehicles in dynamic condition comprises, main support bracket , metal plate with adjusting screw & nut, spring steel strip , bush type thermocouple mounted on other end of said spring steel strip, wherein said main support bracket is rigidly fixed at first end on the vehicle structure, said metal plate with adjusting screw and nut is mounted on outer side at the second end of said main support bracket, said spring steel strip is mounted on inner side at second end of the main support bracket and said bush type thermocouple is fixed on the other end of the said spring steel strip such that it remains in contact with the brake disc surface.
2. The device for measuring the brake disc surface temperature of vehicles in dynamic condition as claimed in claim 1, wherein said bush type thermocouple, spring steel strip and sealing means are capable of withstanding temperature at least 500 deg C.
3. The device for measuring the brake disc surface temperature of vehicles in dynamic condition as claimed in claims 1 to 2, wherein said bush type thermocouple is maintained in contact with the brake disc surface with the said metal plate with adjusting screw and nut.
4. The device for measuring the brake disc surface temperature of vehicles in dynamic condition as claimed in claims 1 to 2, wherein said metal plate comprises group of hole for mounting adjusting screw and nut and bolts.
5. The device for measuring the brake disc surface temperature of vehicles in dynamic condition as claimed in claims 1 to 2, wherein said main support bracket comprises first and second end with mounting holes.

6. The device for measuring the brake disc surface temperature of vehicles in dynamic condition as claimed in claims 1 to 2, wherein said spring steel strip is flexible.
7. The device for measuring the brake disc surface temperature of vehicles in dynamic condition as claimed in claims 1 to 2, wherein said adjusting screw and nut is spring loaded arrangement.
8. The device for measuring the brake disc surface temperature of vehicles in dynamic condition as cfeimed in claims 1 to 2, wherein said seafing means used is of non conducting or insulating type sealing means.
9. The device for measuring the brake disc surface temperature of vehicles substantially as herein described with reference to accompanying drawings.