PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
ELECTROMECHANICAL OIL PUMP
FIELD OF THE INVENTION
The present invention relates to an electromechanical pump for discharging controlled variable oil to engines. More particularly, the pump system of the invention is adapted to deliver measured quantity of lubricating oil to engine having built in mechanism for variable flow mechanical and solenoid type valves integrated such that the pump adjust flow rate based on engine shaft rotation and thereby delivering exact required quantity of oil flow in the engine at desired rate depending on rotational speed or external load condition. The electromechanical pump according to the present invention thus provide optimal lubrication in a simple manner in an integrated internal configuration of said pump, adequate to match load condition preferably for automobile applications such as in two and three wheelers enabling efficient output power delivery at less cost and thus having prospects of wide industrial application.
BACKGROUND ART
It is well known in the art of lubrication systems for automobile engines, there exist usually a pumping means for supply of appropriate grade of lubricant oil to the engine facilitating developing desired power reducing frictional loss and also effecting cooling of the engine so as to deliver maximum power at the output shaft. The moving/friction surfaces of various components of an engine has to be properly lubricated for any engine to function properly to reduce loss, provide power, increase engine efficiency. The conventional configuration of oil pumps for auto engines are typically installed at a suitable location to facilitate connection to the crankshaft of the engine directly drawing power to pumping lubricaing oil and thus having some inherent complexities and limitations.
It is also known in the art that lubrication oil distribution system usually provides for variable flow oil mechanical pumps which is also referred to as Plunger Oil Pump or Positive displacement oil pump which delivers oil by stroking effect of a plunger operatively by action of spring supported fixed face cam. The drive power for the pump is positive in a sense it works on the poshive displacement of the plunger to raise desired pressure of oil the lubricating

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
oil to inject in the engine oil circulation system and such driving power is extracted from the engine crankshaft it self. The oil discharge depends and Varies linearly with the rotational speed of the drive shaft. When the vehicle engine is running on overload such as when traveling uphill over a slope, a lever control assembly varies the stroke of the plunger by rotary cam giving increased flow for a given speed.
It is also known in the prior art lubrication system for engine oil supply and circulation, there also exist electrically operated solenoid oil pumps which deliver oil by reciprocating stroking effect of a spring loaded plunger operated by electrical energization and de-energization of the solenoid. The pump is driven / operated by voltage pulses from an external drive unit and no positive drive is required. The oil discharge depends and varies linearly with the rate of change of pulses. This solenoid based oil pump is a constant delivery oil pump.
The above-mentioned prior art engine lubrication systems suffers from disadvantages because in said systems the pump is in general fitted with the crankshaft which results in inefficient use and requires many components making the system complex. Also, the involvement of too many components results in higher cost and induce lack of efficient operation of such oil pumps.
Although a number of attempts have been made in the related art to improve the system efficiency and simplifying the operational complexity, further investigation is still required to be explored to achieve desired flow of lubricant at lower cost and also to meet the desired rate for required time duration to effectively provide friction free efficient operation of the pump as well as the engine oil lubrication systems.
US 4834039 is a prior patent fitled 'Mulfistage pre-lubricant pump' that states about lubrication system and fuel pumps for an internal combustion engine wherein a first oil supply system having a main engine oil pump which circulates oil to the first plurality of moveable parts and responds to movement within the engine. Also a supplemental engine oil pump communicates with the first oil supply system. The vehicle engine having plurality of oil supply systems to reduce friction/wear of a plurality of multi-component systems comprising movable parts in said IC engine. Each of such lubricating oil supply systems has a corresponding main oil pump,

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
which circulates oil to the corresponding plurality of moveable parts in response to movement within the corresponding system.
This system is also complex and comprises too many subsystems and components increasing cost and complexity of operation, including multistage pre-lubricant oil pump mechanism for use in connection with a starter motor.
US5000143 is a prior patent titled 'Engine lubrication system with shared oil filter' that states about an electrical oil pump in a lubrication system for internal combustion engine wherein an electrical time delay is also used such that oil is pressurized even when the mechanical pump is not fully operational, and is also adapted to pressurize oil in turbo charged engine.
This lubrication system do not provide any advantageous constructional features of either the mechanical and or electrical pump used in the automobile engine directed to eliminating the limitations of the prior art and also make use of two isolated pumps involving more components leading to enhanced cost and complexity with less efficiency.
US 6709362 is a prior art titled 'Electric oil pump control device' an electric oil pump capable of suppressing wear of an electric oil pump used as auxiliary to a main oil pump to thereby prolong the life of the pump and avoid any need to provide a larger pump. The electrical pump is operated only for a predetermined acceptable operation time when the engine is activated to cause the mechanical oil pump to supply oil pressure. This arrangement can limit successive operating time for the electric oil pump, protect from wear of parts and eliminate use of a larger electrical pump.
This prior art also directs to a system of lubrication that make use of separate mechanical and electrical pump for desired oil circulation under desired pressure, thus involving duplication of parts or involving multiple components involving more cost and complexity and also inefficient control on oil supply parameters under dynamic load conditions.

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
CA 2514817 is a prior patent titled 'Reciprocating double acting pump' that can be used as an air compressor or a fluid pump wherein the reciprocating motion of the piston is achieved by the operation of a corresponding rotational motion of a screw that needs fairly little torque and such double acting pump when applied for fluid pumping may be used to pump out/lift oil especially from deep wells, consuming less energy for lifting equal volume of oil by other pumps.
The invention does not however ensure desired performance or effectiveness of such pump for application in pumping lubricating oil in automobile engines.
It is thus clearly apparent from the above state of the art that although some attempts have been made to rationalize power consumption and reducing wear in oil pumps for a number of applications, there has still been a persistent need to reduce redundancy of components and use in fewer numbers and also to reduce exclusive reliance on friction/wear prone arrangements of moving parts in any mechanical pump, especially for application in pumping of lubrication oil for engines including automobile application. Such pump would integrate the features of mechanical as well as electrical pumps in a simple manner reducing the numbers of the components required and also minimize the associated costs and complexity of operation. Such, integrated configuration of pumps would also favor precise control on measured inflow of oil in the lubrication system of engines needing little/no drive power from engine crankshaft and thus increasing engine power and efficiency.
OBJECTS OF THE INVENTION
It is thus the basic object of the present invention to provide an electromechanical oil pump device for oil discharge to engines wherein the integration of Mechanical Variable Flow Oil Pump and Solenoid pump is incorporated in internal constructions of the pumps which ensures measured oil discharge to the engine commensurate with shaft rotation and/or output load condition.

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
A further object of the present invention is directed to an Electromechanical Oil Pump device for discharging controlled flow of oils to engines to make use of fewer components in the lubricating oil pump so that cost of spares is minimized and also the operation is simple yet precise in quantity of oil discharged to the system.
A still further object of the present invention is directed to involve solenoid operated electrical pump adapted for variable flow of oil and is integrated with the variable flow mechanical pump in a single pump embodiment.
A further object of the present invention directed to said electromechanical pump device comprising a Control Shaft along with a CAM which is so designed as to get the variable flow at different rotation of the shaft controlled by the throttle actuation of the accelerator cable through a Lever.
A still further object of the present invention directed to an Electromechanical Oil Pump to discharge controlled oil flow to engine the Cam Control system comprising of Control shaft, lever, torsion spring are inbuilt to the system and is linked to the control shaft to favor desired integrated configuration of the pump device.
A further object of the present invention is directed to an Electromechanical Oil Pump device for lubrication of automobile engines that need not be directly coupled with the crankshaft, and this prevents load on the engine.
A further object of the present invention is directed to an Electromechanical Oil Pump device for lubrication of automobile engines adapted for application in engines such as in 2 wheeler and 3 wheeler automobile engines.
A further object of the present invention is directed to an Electromechanical Oil Pump device for lubrication of automobile engines wherein said pump can be mounted anywhere in the vehicle system and favor ease of accessibility.

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
A still further object of the present invention is directed to an Electromechanical Oil Pump device for lubrication of automobile engines very compact and eliminates many accessories required to couple to the crankshaft such as housing, bearings, coupler shaft etc and thus favoring easy maintenance and spares availability with least cost.
SUMMARY OF THE INVENTION
The according to the basic aspect of the present invention there is provided an electromechanical oil pump device for engines for oil discharge to the engine comprising:
mechanical pump means for variable flow of oil integrated with solenoid based pump means
adapted for variable flow control of oil to engine.
Another aspect of the present invention is directed to an electromechanical oil pump device for
engines comprising
cam control system adapted for the variable flow comprising of control shaft, lever, torsion
spring.
A further aspect of the present invention is directed to an electromechanical oil pump device for engines wherein said integration of the mechanical means for variable flow of oil with the solenoid based means adapted for variable flow control of oil comprise guide, spring-guide, cam pin, sub plunger and spring-sub plunger.
A still further aspect of the present invention is directed to said electromechanical oil pump device for engines wherein the control shaft comprises of a CAM which is so adapted to get the variable flow at different rotation of the shaft, the rotation of the shaft being controlled by the throttle actuation of the accelerator cable through the Lever.

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
According to yet another aspect of the present invention directed to said electromechanical oil
pump device for engines wherein the Lever and Torsion Spring are parts of the cam control
system which is linked to the control shaft.
A still further aspect of the present invention is directed to an electromechanical oil pump device for engines wherein the cam pin comprises of a 'pinch' which is adapted to be always in contact with the CAM of the control shaft such that as the control shaft rotates, the Guide-Cam pin assembly reciprocates and thereby the 'volume of oil chamber between the Sub-Plunger and Guide varies.
According to an important aspect of the present invention is directed to said electromechanical oil pump device for engines wherein the stroke of sub-plunger is adapted to be varied to achieve the required variation in flow in synchronization with the throttle actuation.
An yet further aspect of the present invention directed to said electromechanical oil pump device for engines wherein spring-sub plunger & spring-guide are adapted to aid the to and fro motion of the sub plunger and guide.
The present invention and its objects and advantages are described in greater details with reference to the accompanying non limiting illustrative figure.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
Figure 1: is the schematic illustration of the sectional view through the longitudinal axis of the Electromechanical Pump according to the invention, used for pumping of controlled measured variable flow/discharge of oils for engines.

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS
The present invention is directed to an Electromechanical oil pump that integrate a variable flow mechanical oil pump with an electrical solenoid type variable flow oil pump inbuilt in a single housing of said pump. Advantageously, the electromechanical configuration of the lubricating oil pump according to the present invention comprise an independent cam control system that include a control shaft so that the requirement of mounting the pump directly on the crankshaft is eliminated and the involvement of the components in the total assembly performing the variable flow function according to the need for friction/wear parts of engine decided by the speed of rotation or high load condition at relatively low engine speed, needing variability in rate of oil discharge/flow to avoid wear and tear and friction free operation ensuring delivering/availability of higher power at output shaft.
Reference is first invited to the accompanying Figure 1, which schematically illustrates an embodiment of the electromechanical pump according to the present invention showing the arrangement in sectional view, of different components inbuilt in said pump device which incorporates features of both variable flow type mechanical as well as electrical solenoid operated plunger type pump. The Electromechanical Oil Pump of the present invention wherein the integration of Mechanical Variable Flow Oil Pump and Solenoid pump is achieved with changes in internal constructions of the pumps so that the requirements of number of components is reduced and thereby ensuring ease of operation, enhanced service life and reducing the associated costs. Such Electromechanical Oil Pumps are adapted to be used preferably for lubricant oil supply in engines for 2 wheelers and 3 wheeler vehicles/automobiles.
An exemplary embodiment of the Electromechanical Oil Pump according to the invention is shown in the accompanying Figure 1, is comprising the Cam control system to achieve variable flow involving an independent Control shaft, lever, torsion spring etc that are inbuilt into the existing lube oil pumping device. More importantly, the mechanical and electrical solenoid portions of the electromechanical oil pump is integrated inside the pump housing by

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
means of components like Guide, Guide-Spring, Cam pin. Sub Plunger and Sub Plunger Spring are used for functional integration directed to desired flow rate of oil at measured quantity depending on speed of rotation of engine shaft and also output load related demand of engine oil. The Control Shaft forming part of Cam control system inside the pump consists of a CAM which is designed to generate the variable flow at different rotation of the shaft. Wherein the rotation of the shaft is controlled by the throttle actuation of the accelerator cable through the Lever. Also, the lever, torsion spring etc., forming part of the Cam control system is linked to the control shaft, such that the relative change in position of the lever and thereby the acceleration of the vehicle operatively causes a corresponding disposhion of the cam pin in relation to cam in the cam controller system that determines the relative displacement of the sub-plunger and the guide so as to define the variable flow volume of the lube oil into the engine.
The cam pin of the cam controller system consists of a 'pinch' which always remain in contact with the CAM of the control shaft. As the control shaft rotates, the Guide-Cam pin assembly reciprocates. As a result of this the volume of oil chamber between the Sub-Plunger and Guide varies i.e. the stroke of Sub-Plunger is varied to achieve the required variation in flow in synchronization with the throttle actuation. The Electromechanical Oil Pump of the integrated configuration according to the present invention thus enable measured variable oil flow to the engine wherein Sub Plunger-Spring and the Guide-Spring are necessarily required to aid the reciprocating/to and fro motion of the Sub Plunger and Guide and also to enable constant contact of cam pin pinch on the cam.
The system specification for operation of the electrical energization of the variable flow solenoid pump in the integrated electromechanically configured oil pump, comprise
Nominal Voltage of: 12 V;
Operating voltage in the range of: 8.5 V to 18 V;
Electrical Current rating of: 1A (max);
Insulation resistance of : 1 M Ohm (Min) @ 500 V DC meggar;

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
It has been further noted that the electromechanical pump according to the invention has the flow specification achieved in synchronization with lever movement for throttle actuation, calibrated for different lever positions, comprise

LEVER ANGLE RPM
(Ref) DISCHARGE / STROKE NO.OF PULSES
/MIN FLOW
SPECIFICATION
CC/Hr
0° 1500 0.015 8.73 6.0^'^
8° 1500 0.015 8.73 6.0^'^
20° 3000 0.029 17.17 30"^''
30° 4500 0.043 25.61 66.0 *« °
40° 6000 0.057 34.06 115^'^°
45° 6750 0.065 38.28 150 "''
The electromechanical oil pump device for variable oil flow to engines according to the present invention is therefore, adapted to discharge controlled flow of oil for engine lubrication in sync with lever adjusted throttle actuation and variable stroke of sub plunger operatively through an independent control shaft with cam determining volume flow rateof oil and thus effecting desired integration of the mechanical as well as electrical solenoid pumps for controlled and measured flow of oil for engine lubrication.
It is thus possible by way of the present invention to develop an Electromechanical oil pump device for supply of lubrication oil in engine of the 2/3 wheeler automobiles wherein the design configuration and the functional features of variable flow mechanical plunger type pump and the electrically operated solenoid type pumps are integrated into one pumping device in an inbuilt manner. More importantly, such an electromechanical pump having a cam controller system that include a control shaft and other elements that enable mounting of the pump at any location in the vehicle system without the need for direct mounting on the crank shaft of the engine and thus saving on power output and improving engine efficiency. The integrated design

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
configuration of the electromechanical pump according to the present invention on one hand reduce the use of too many components and thus escalating the cost of the device and on the other hand makes the device efficient in supply of lubricating oil to engine in a optimal way commensurate with and in synchronization with engine acceleration or abnormal operation such as high load at low speed (rotation) condhion of the engine operation.

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
WE CLAIM:
1. An electromechanical oil pump device for engines for oil discharge to the engine
comprising:
mechanical pump means for variable flow of oil integrated with solenoid based pump means adapted for variable flow control of oil to engine.
2. An electromechanical oil pump device for engines as claimed in claim 1 comprising cam control system adapted for the variable flow comprising of control shaft, lever, torsion spring.
3. An electromechanical oil pump device for engines as claimed in anyone of claims 1 or 2 wherein said integration of the mechanical means for variable flow of oil with the solenoid based means adapted for variable flow control of oil comprise guide, spring-guide, cam pin, sub plunger and spring-sub plunger.
4. An electromechanical oil pump device for engines as claimed in anyone of claims 1 to 3 wherein the control shaft comprises of a CAM which is so adapted to get the variable flow at different rotation of the shaft, the rotation of the shaft being controlled by the throttle actuation of the accelerator cable through the Lever.
5. An electromechanical oil pump device for engines as claimed in anyone of claims 1 to 4 wherein the Lever and Torsion Spring are parts of the cam control system which is linked to the control shaft.

PRICOL LIMITED
PROVISIONAL SPECIFICATION NO.2878/CHE/2007
6. An electromechanical oil pump device for engines as claimed in anyone of claims 1 to 5 wherein the cam pin comprises of a 'pinch' which is adapted to be always in contact with the CAM of the control shaft such that as the control shaft rotates, the Guide-Cam pin assembly reciprocates and thereby the volume of oil chamber between the Sub-Plunger and Guide varies.
7. An electromechanical oil pump device for engines as claimed in claim 6 wherein the stroke of sub-plunger is adapted to be varied to achieve the required variation in flow in synchronization with the throttle actuation.
8. An electromechanical oil pump device for engines as claimed in anyone of claims 1 to
7 wherein spring-sub plunger & spring-guide are adapted to aid the to and fro motion
of the sub plunger and guide.
9. An electromechanical oil pump device for engines as claimed in anyone of claims 1 to
8 having the following system specifications:
Nominal voltage :12V DC
Operating voltage range : 8.5 to 18 V
Current rating : 1 A (Max)
Insulation resistance : 1 M Ohm (Min) @ 500 V DC meggar.
10. An electromechanical oil pump device for engines as claimed in anyone of claims 1 to 8 which is adapted for the following flow specification

•PRICOL LIMITED PROVISIONAL SPECIFICATION NO.2878/CHE/2007
ANr^F ^i^^^cTRo^?^ PULSES SPECIF^^^
ANGLE (Ref) /STROKE ^^-^^ CC/Hr
0° 1500 0.015 8.73 6.0*'^
8° 1500 0.015 8.73 6.0*'^
20° 3000 0.029 17.17 30 ^"^"^
30° 4500 0.043 25.61 66.0^*°
40° 6000 0.057 34.06 115*'^'^
45° 6750 0.065 38.28 150^^^
11. An electromechanical oil pump device for engines substantially as herein described and illustrated with reference to the accompanying figure.