FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
PROVISIONAL SPECIFICATION
(See section 10 and rule 13)
L TITLE OF THE INVENTION :
''Corner Tube Protector for Radiator Core Assembly"

2. APPLICANT:
(a) NAME : TATA TOYO RADIATOR LTD
(b) NATIONALITY : An Indian Company registered under the
(c) ADDRESS
. Provisions of fhft Companies Xct, 1956 : S.NO.235/245 Village HinjewadL
Taluka-Mulshi, Pune 411027
Maharashtra State, INDIA
3.PREAMBLE TO THE DESCRIPTION

PROVISIONAL
The following specification describes the invention.

Title of Invention :
"Corner Tube Protector for Radiator Core Assembly"
Nature of Invention :
The present invention is related to Corner tube protector in the radiator core. More particularly, it is related to Corner tube protector to be inserted at the openings of end tubes for strengthening of tubes in radiator core assembly. This helps to resist the early failure of tubes due to fatigue failure on account of excessive vibration and twisting stresses developing on corners of end tubes.
Background & Prior Art:
According to the knowledge and belief of the inventor, radiators are being used without present invention.
Drawbacks in Prior Art:
1. Premature failure of radiator tube cracks due to fatigue & twisting stresses concentration while it is put on vehicle.
2. Due to product failure, warranty claims rapidly raised causing heavy losses to the manufacturer by bearing customer debit.
Objects of Invention :
The main object of the present invention is to strengthen the radiator core in radiator core assembly to eliminate the occurrence of tube failures and also leakage from end tubes & header plate brazing joint due to experience of heavy duty fatigue & twisting loads.
Another object of the invention is to increase the life of the radiator core where the phenomenon of excessive vibration & twisting occurs due to large sized radiator core used on heavy commercial vehicles (HCV) particularly on rugged terrain, normally encountered in developing countries.

Another object of the present invention is to eliminate the warranty failures which help manufacturers to eliminate to bear the heavy debits by customer in terms of money and also to retain the customer faith on our product quality.
Desc ription of the Figu res :
Figure 1 shows front view of the radiator assembly of present invention.
Figure 2 shows the sectional detail view of Corner tube protector insertion inside
openings of ends tubes of unbrazed radiator core. Figure 3 shows the detail top view of Radiator core with assembly of Corner tube
protector. Figure 4 shows the perspective view of Corner tube protector.
Detailed Description of Invention :
Radiator assembly (figure 1) is a used along with internal combustion (IC) engine application as a part of engine cooling system. It is used for cooling of coolant which consumes the heat from IC engine. As shown in figure 1, coolant passes through series for tubes (5) where heat dissipates through medium of cooled ambient air by gaining heat from thin fin (4) surfaces which was transferred from tube wall. This heat transfer being takes place by couple of convection & conduction mode. Radiator (figure 1) is made by assembling of inlet tank (1) & outlet tank (10) with core assembly (6), by clinching the lugs of header plate (3), whereas core assembly (6) is a bunch of alternating lamina of fin (4) & tube (5). The joints between fins (4) & tubes (5) are taken place through brazing operation by means of brazing furnace.
Radiator assembly's uses for HCV application have large core size on account of higher heat transfer performance requirement. These assemblies are fixed on vehicle through member supports (7) & rubber dampers. Due to vehicle constraints, the mounting of radiator assembly are neither properly spanned nor equispaced about the center of gravity. With such kind of mounting, radiator assembly experiences higher intensity of vibration & twisting loads which results in severe fatigue of the tube joints at corners & pre-mature crudity of tube wall

leakage of coolant & consequential damage to engine. Due to this radiator manufacturer receives many warranty failures and this result in to accept the higher debits in terms of money. Hence it necessary to analyze causes of failure and its remedies.
Since radiator manufacturer does not have option on the radiator mounting hence it was decided to imparting additional strength to tubes (5) by innovative design. This is the only solution to insert additional object (Corner tube protector) (2) at the openings of end tubes of unbrazed radiator core so that it gets braze after passing through brazing furnace.
By inserting Comer tube protector (2) inside openings of end tubes (5) of unbrazed radiator core (6) assembly, the sectional modulus increased of thin walled tubes which help to sustain the heavy fatigue and twisting stresses while actual working conditions meanwhile elimination of scopes of end tubes failure. As shown in figure 2 & 3, by inserting Comer tube protector (2) at openings of tube (5), it is observed blockage of the free flow area of coolant across those tubes (5). Blockage of any tubes (5) is never desirable because results to reduce coolant flow therefore exhibits uneven thermal stress to adjacent tubes; reduces heat transfer capacity and also raises coolant pressure drop. To overcome these difficulties, as shown in figure 4, Comer tube protector prongs (11) pitch & height are designed such that it exists minimum coolant flow obstruction while offer less pressure drop and eliminate the scope of uneven thermal stress development and achieve designed heat transfer across end tubes based on experimental results.
Advantages of Present Invention :
The advantages of the present invention are mentioned below:
1. Comer tube protector strengthens the tubes to sustain the heavy fatigue & twisting loads without any failure means it improves the product reliability.
2. Elimination of field warranty failures & debits just due to leakage of end tubes and also help to retain the customer faith on our product quality.

3. Expanding the scope of usage of larger sized radiator core especially for HCV application.
Dated this 01sl July, 2009
M. D. Bhate (Agent of Applicant)