FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See Section 10; rule 13]
"AN ELECTRIC WATER PUMP WITH IMPROVED SHAFT"
ADVIK HI-TECH PVT. LTD.
an Indian private Limited Company,
Plot No. B-5, Chakan Industrial Area, Phase II,
Village-Vasuli, Tal-Khed,
Dist-Pune, Pin-410501
Email: cie@advik.co.in
The following specification particularly describes the invention and the manner in
which it is to be performed.

FIELD OF INVENTION
[0001] The present invention relates to a water pump, and more particularly the present invention relates to an electric water pump for thermal management system used in vehicles.
BACKGROUND OF THE INVENTION
[0002] In automotive sectors thermal management system performs very important role in vehicles i.e. in commercial vehicles. To control the temperature of the electric motor, inverter, battery and other systems water pump is used to reduce the temperature. In this period of time the automotive sector is turning to electrical vehicles. The electrical water pump is used mostly in electrical vehicles as thermal management system.
[0003] The conventional electrical water pump consists of volute casing with inlet and outlet, screw for connecting housing & rotor casing, shroud, impeller connected to rotor, rotor casing, oring, stator with windings and terminals, oring, housing, controller, cover, screw.
[0004] The shaft used in the conventional electric water pump, the shaft press fitted in housing. The shaft manufactured by three processes i.e. machining, chamfer, cutting. Therefore it increase the time of assembly, process & so productivity is less. This process also required extra pokayoke for placement of shaft in the housing. One more problem that if the shaft may be placed in wrong direction then the whole part gets damaged.
[0005] To overcome aforementioned drawbacks present in the conventional electric water pump, there is a need of an electric water pump with improved magnet.
OBJECTS OF THE INVENTION

[0006] The main object of a present invention is to provide an electric water pump with improved shaft.
[0007] The another object of the present invention is to provide an electric water pump with improved shaft that minimize the manufacturing process of shaft.
[0008] The another object of the present invention is to provide an electric water pump with improved shaft that increases productivity.
[0009] The another object of the present invention is to provide an electric water pump with improved shaft that reduces wrong placement of shaft in the housing.
[00010] The another object of the present invention is to provide an electric water pump with improved shaft that improves efficiency.
[00011] The another object of the present invention is to provide an electric water pump with improved shaft that is cost efficient.
BRIEF DESCRIPTION OF THE DRAWINGS
[00012] The accompanying drawings constitute a part of the description and are used to provide further understanding of the present invention. Such accompanying drawings illustrate the embodiments of the present invention which are used to describe the principles of the present invention together with the description.
[00013] Fig. 1 shows a cross sectional view of a conventional water pump disclosed in the prior art;
[00014] Fig. 2 shows a cross sectional view of an electric water pump with improved shaft in accordance with the preferred embodiment of a present invention.
[00015] Fig; 3 shows an exploded view of an electric water pump with improved shaft in accordance with the preferred embodiment of a present invention.

[00016] Fig. 4 shows view of shaft in accordance with the preferred embodiment of a present invention.
[00017] Fig. 5 shows view of shaft in accordance with the preferred embodiment of a present invention.
[00018] Fig. 6 shows view of shaft in accordance with the preferred embodiment of a present invention.
SUMMARY OF THE INVENTION
[00019] The present invention relates to a water pump, and more particularly the present invention relates to an electric water pump for thermal management system used in vehicles.
[00020] An electric water pump with improved shaft (100), the pump (100) includes a housing (40), a volute casing (10) includes atleast one inlet (170) and atleast one outlet (180), the volute casing (10) coupled to housing (40), a shaft (140) coupled to housing (40), a stator assembly (50) coupled to housing (40) by fastening means, a rotor assembly (20), a cover (110) coupled to housing (40) by fasteners (80) and a controller (70) operably coupled to bottom of the housing (40)/stator assembly (50) by fasteners for controlling the speed of pump.
[00021] In an aspect of present invention both the ends of shaft (140a and 140b) including an oval shape.
[00022] In an aspect of present invention the both ends of the shaft (140) including similar the oval shape (140a and 140b).
[00023] In an aspect of present invention the oval shape (140a and 140b) at both ends of the shaft (140) achieved by but not limited to punching or hammering or pressing.
[00024] In an aspect of present invention the shaft (140) insert molded with housing.

[00025] In an aspect of present invention the oval shape (140a and 140b) of the shaft (140) avoids the rotation of shaft (140) in housing (40).
[00026] In an aspect of present invention the shaft (140) including major diameter D, major diameter of end d2 and minor diameter of end dl, wherein the diameter D greater than diameter or equal to d2 greater than diameter dl (D>=d2>dl).
[00027] In an aspect of present invention the rotor assembly (20) having a shroud (120), an impeller (190), a plurality of bushes (220) and a magnet (30).
DETAILED DESCRIPTION OF THE INVENTION
[00028] As used in the description herein and throughout the claims that follow, the meaning of "a," "an," and "the" includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of "in" includes "in" and "on" unless the context clearly dictates otherwise.
[00029] If the specification states a component or feature "may", "can", "could", or "might" be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[00030] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This disclosure may however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
[00031] The present invention relates to a water pump, and more particularly the present invention relates to an electric water pump for thermal management system used in vehicles.
[00032] Referring Fig 2, Fig 3, Fig 4, Fig 5, and Fig 6, an electric water pump with integrated rotor (100), the pump (100) includes a housing (40), the housing (40) made up of but not limited to metal or non metal or plastic or thermoplastic, a

volute casing (10) including atleast one inlet (170) and atleast one outlet (180), the volute casing (10) made up of but not limited to metal or non metal or plastic or thermoplastic well known in the art, the volute casing (10) coupled to housing (40) by fastening means like but not limited to spin welding or press fitting or alike, a shaft (140) coupled to housing (40) by manufacturing process process like but not limited to injection molding or insert molding or press fitting or snap fitting or casting or alike, the shaft (140) made up of but not limited to stainless steel, a stator assembly (50) coupled to housing (40) by fastening means, a rotor assembly (20), a cover (110) coupled to housing (40) by fasteners (80) and a controller (70) operably coupled to bottom of the housing (40)/stator assembly (50) by fasteners for controlling the speed of pump.
[00033] In an aspect of present invention both the ends of shaft (140a and 140b) including an oval shape.
[00034] In an aspect of present invention the both ends of the shaft (140) including similar the oval shape (140a and 140b).
[00035] In an aspect of present invention the oval shape (140a and 140b) at both ends of the shaft (140) achieved by but not limited to punching or hammering or pressing.
[00036] In an aspect of present invention the shaft (140) insert molded with housing.
[00037] In an aspect of present invention the oval shape (140a and 140b) of the shaft (140) avoids the rotation of shaft (140) in housing (40).
[00038] In an aspect of present invention the shaft (140) including major diameter D, major diameter of end d2 and minor diameter of end dl, wherein the diameter D greater than diameter or equal to d2 greater than diameter dl (D>=d2>dl).

[00039] In an aspect of present invention the rotor assembly (20) having a shroud (120), an impeller (190), a plurality of bushes (220) and a magnet (30).
[00040] As the shaft (140) is insert molded in the housing (40) and it is easy to fix the position in the housing (40) for insert molding, also after placing (140) in the housing (40) the shaft (140) not rotates around the axis because of oval shape. Therefore the shaft (140) requires high torque or force to disassemble or to remove from housing (40).
[00041] The non limiting operational characteristics of an integrated electric water pump (100) is explained here, when the temperature of application (e.g. but not limited to thermal management system of vehicle) is high than limited temperature, the temperature sensor gives the signal to the controller. Then Pulse-width modulation (PWM) (well known in art) of the controller (70) gives the output signal according to the temperature of application. As PWM signal is given to the motor, the stator produces rotating magnetic field, such that flux links with the rotor (20) field, then rotor (20) start to rotate at specified speed. Therefore water enters into the pump by inlet (170), it flows from the impeller (190) and enters in the rotor housing (40), exits from the outlet (180). The oval shape (140a and 1.40b) of the shaft (140) avoids the rotation of shaft (140) in housing (40).
[00042] In the above detailed description, reference is made to the accompanying drawings that form a part thereof, however, such description should not be considered as any limitation of scope of the present invention. The structure thus conceived in the present description is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence.
[00043] ADVANTAGES
1. Manufacturing processes are less as compared to prior art.
2. Assembly process time is less, resulting high productivity, high reliability.

3. Tt can be placed in any direction, no need for checking the direction of the shaft,
4. Part damage because of shaft gets reduced.
[00044] List of reference numerals:
1. An integrated electric water pump (100)
2. A volute casing (10)
3. A rotor assembly (20)
4. An magnet (30)
5. A housing (40)
6. A stator assembly (50)
7. A controller mounting pad (60)
8. A controller (70)
9. A screw fastener (80)
10. A rubber seal (90)
11. Acover(llO)
12. A shroud (120)
13. A washer thrust (130)
14. A shaft (140)
15. Ends of Shaft (140a and 140b)
16. Major diameter D, major diameter of end d2 and minor diameter of end dl.
17. A stator terminals (150)
18. A connector main terminals (160)
19. An inlet (170)
20. An outlet (180)
21. An impeller (190)
22. A connector (210) 23.A bush (220)

CLAIMS We claim,
1. An electric water pump with improved shaft (100), the pump (100) comprises:
a housing (40);
a volute casing (10) having atleast one inlet (170) and atleast one outlet
(180), the volute casing (10) coupled to housing (40);
a shaft (140) coupled to housing (40);
a stator assembly (50) coupled to housing (40) by fastening means;
a rotor assembly (20);
a cover (110) coupled to housing (40) by fasteners (80); and
a controller (70) operably coupled to bottom of the housing (40)/stator
assembly (50) by fasteners for controlling the speed of pump;
wherein both the ends of shaft (140a and 140b) having an oval shape.
2. The electric water pump with improved shaft (100) as claimed in claim 1, wherein the both ends of the shaft (140) having similar the oval shape (140a and 140b).
3. The electric water pump with improved shaft (100) as claimed in claim 1, wherein the oval shape (140a and 140b) at both ends of the shaft (140) achieved by but not limited to punching or hammering or pressing.
4. The electric water pump with improved shaft (100) as claimed in claim 1, wherein the shaft (140) insert molded with housing.
5. The electric water pump with improved shaft (100) as claimed in claim 1, wherein the oval shape (140a and 140b) of the shaft (140) avoids the rotation of shaft (140) in housing (40).
6. The electric water pump with improved shaft (100) as claimed in claim 1, wherein the shaft (140) having major diameter D, major diameter of end d2 and minor diameter of end d 1, wherein the diameter D greater than diameter or equal to d2 greater than diameter dl (D>=d2>dl).

7. The electric water pump with improved shaft (100) as claimed in claim 1, wherein the rotor assembly (20) having a shroud (120), an impeller (190), a plurality of bushes (220) and a magnet (30).