Claims:I/WE CLAIM:
1. An electric drive system comprising,
a motor housing (9) wherein includes a stator and a rotor assembly;
said rotor assembly wherein includes a rotor, a shaft (7), and a pulley (1);
said shaft (7) attached to the pulley (1) and transfers the rotating motion from the rotor to the pulley (1);
said pulley (1) having a first portion adjacent to the motor housing (9), and a second portion at the other end;
characterized in that, a dust cap (3) integrated at the first portion of the pulley (1).

2. The electric drive system as claimed in claim 1, wherein the said pulley (1) is connected to rotor shaft (7) end through the nut.

3. The electric drive system as claimed in claim 1, wherein the said pulley (1) has plane A refers to the height of the dust cap (3) projection, and plane B refers to the height of the pulley (1) projection.

4. The electric drive system as claimed in claim 1, wherein the projection plane A of dust cap (3) is greater than the projection plane B of pulley (1).

5. The electric drive system as claimed in claim 1, wherein the said rotor assembly is assembled in motor housing (9) through bearing (6).

6. The electric drive system as claimed in claim 1, wherein the said dust cap (3) will cover the bearing (6) from contamination and prevents dust from entering into the chamber or motor housing (9) of the motor.

7. The electric drive system as claimed in claim 1, wherein there is bending or inclination provided at the dust cap (3) that provides motor housing (9) for inhibiting dust.
, Description:FIELD OF INVENTION
The present invention relates to the field of electric drive systems in general. More specifically, it relates to belt driven Starter Generator/Motor in the category of automotive parallel hybrid technology that uses an electric motor to contribute power to the internal combustion engine’s crankshaft via a serpentine belt. The intent of this design is to integrate the splined pulley with dust cap feature in the pulley to bring a more robust design, value addition to the component in cost-saving.
BACKGROUND OF THE INVENTION:
An electric motor is a device that generates electric energy from the motor’s currents and magnetic field. Which can be further converted into motion or mechanical energy. These are a part of almost every aspect of modern living from fans, air conditioners, vacuum cleaners, cars, refrigerators and other appliances all derive mechanical energy from electric motors.
Alternating current is the standard supply that comes out of power outlets. Direct current can come from multiple sources like batteries, solar cells, fuel cells, and other modified alternators. A stator, a commutator, and a rotor are the three main parts of the electric motor, they use electromagnetism to spin the motor. The moving part of the electric motor is the rotor which delivers mechanical power from the shaft . The bearing is are supported by the motor housing which supports the rotor which allows the rotor to turn. Pulleys are also a part of the motor and are used as links for pumps to motors through drive belts.
The patent DE102016209598A1 relates to a pulley decoupler for driving torque transmission between the belt of a starter-generator belt drive and the starter generator, comprising: - a pulley - a hub to be mounted on the generator shaft of the starter generator, - a decoupler spring, which transmits the drive torque of the belt from the pulley to the hub when the starter generator is driven, and a lock which transmits the driving torque of the generator shaft from the hub to the pulley when the starter generator is driving a Schlingband to be formed, which is connected in the drive torque flow between the pulley and the hub parallel to the decoupling spring and the pulley rotates torsionally stiff against the hub when driving starter generator.
In another patent EP3274603B1 relates to a decoupler for the rotary drive of a generator of an accessory belt drive of an internal combustion engine, comprising: a belt-driven pulley, a hub driving the shaft of the generator, which is disposed radially inside the pulley, two axially spaced bearing points, on which the pulley is rotatably mounted on the hub, a series arrangement of a helical torsion spring and a one-way clutch arranged radially between the pulley and the hub and allowing the hub to overtake the drive pulley in the drive direction of rotation, a relative to the pulley or the hub rotatably fixed spring plate for the one end of the helical spring and a relative to the pulley and the hub rotatable spring plate for the other end of the helical spring.
In another patent, CN105257805A relates to a pulley for an alternator, and in particular, to a pulley applicable to an automotive alternator. The pulley effectively mitigates the problem that a belt and a tension pulley of an alternator vibrate because a rotation speed of a vehicle engine changes, thereby improving the overall operating efficiency of the alternator and the service life of the working belt and the tension pulley.
Similarly, the patent KR101194886B1 relates to an isolator including a hub; A pulley forming a frictional engagement with the hub through the bushing for a momentary rotational movement; An elastic member engaged between the pulley and the hub for torque transmission; And a locking member for holding the pulley in the hub, wherein the bushing and the hub have a coefficient of friction.
There are several enhancements in this technology for more efficiency and feasibility. However, there exists a need to keep the parts of the motors dust-free. The existing pulley does not come with dust protection, the bearing is not protected from dust or foreign particle. This invention is unique in that comes with an integrated pulley that has dust protection features in it. Hence, the present invention provides a solution for the existing disadvantages and problems.
OBJECTIVE OF THE INVENTION
The primary objective aims to develop a belt driven Starter Generator/Motor in automotive parallel hybrid technology that uses an electric motor to contribute power to the internal combustion engine’s crankshaft via a serpentine belt.
The secondary objective is to design an integrated splined pulley (1) with a dust cap (3) feature in the pulley (1) to bring more robust design value addition to the component in cost-saving.
SUMMARY OF THE INVENTION
The following summary is provided to facilitate a clear understanding of the new features in the disclosed embodiment and it is not intended to be a full, detailed description. A detailed description of all the aspects of the disclosed invention can be understood by reviewing the full specification, the drawing, and the claims, and the abstract, as a whole.
The present invention aims to develop an electric drive system that has a pulley (1) which comes with dust protection features in it to bring more robust in design, easy to assemble, and more reliability.
The pulley (1) of the present invention is to connect the electric motor shaft (7) to the engine crankshaft through a belt drive. The purpose of the dust cap (3) in the pulley (1) is to protect the bearing (6), fan, and other components inside the motor housing from foreign/dust particles.
In another aspect of the present invention, the integrated pulley (1) with the dust cap (3) is formed through insert molding or any other similar means.
In one aspect the pulley (1) with the projected feature above the plane A will protect the bearing (6) and other sub-assembly components inside the motor housing (9) from dust or foreign material coming from the inside and outside of the motor housing (9).
In yet another aspect, the integrated pulley (1) with an elongated feature from plane A and the housing includes stator and rotor assembly.
Similarly, in yet another aspect Rotor assembly comprises shaft (7), rotor, bearing (6) and is assembled in motor housing (9) through bearing (6). The shaft (7) includes a pulley (1) at the end. The shaft (7) attached to the pulley (1) and transfers the rotating motion from the rotor to the pulley (1).
Pulley (1) is connected to rotor shaft (7) end through the nut, the motor will drive the engine crankshaft through serpentine V belts. Once the rotor receives input current from the battery it will rotate the pulley (1) which is connected to the crankshaft. The pulley (1) having a first portion adjacent to the motor housing (9), and a second portion at the other end. The dust cap (3) is integrated at the first portion of the pulley (1).
BRIEF DESCRIPTION OF THE DRAWINGS
The manner in which the proposed system works is given a more particular description below, briefly summarized above, may be had by reference to the components, some of which is illustrated in the appended drawing It is to be noted; however, that the appended drawing illustrates only typical embodiments of this system and are therefore should not be considered limiting of its scope, for the system may admit to other equally effective embodiments.
Throughout the drawings, the same drawing reference numerals will be understood to refer to the same elements and features. The features and advantages of the present proposed system will become more apparent from the following detailed description along with the accompanying figures, which forms a part of this application and in which:
Fig.1 depicts the cross section of the said electric motor drive displaying the parts in the device in accordance with the present invention. Plane A and plane B are also illustrated here. There are 9 parts represented in this diagram, namely
Fig.2 (a, b, c) represents the cross section and the isometric view of the structure in accordance with the present invention.
REFERENCE NUMERALS
1-Pulley;
2-Pulley Profiles;
3-Dust Cap;
4-Shaft engagement portion;
5-Bending portion towards motor housing
6-Bearing;
7-Shaft;
8-Nut;
9-Motor Housing;
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an electric drive system that has a pulley (1) which comes with dust protection features in it to bring more robustness in design, easy to assemble, and more reliable. Belt driven Starter Generator/Motor is a category of automotive parallel hybrid technology that uses an electric motor to contribute power to the internal combustion engine's crankshaft via a serpentine belt. By mounting this motor generator unit in the conventional location traditionally used for the standard automotive alternator, it permits a low-cost method of adding mild hybrid capabilities such as start-stop, power assist, and mild levels of regenerative braking.
Fig 1, depicts the different parts of the motor, namely, rotor, pulley (1), pulley profiles (2), motor housing (9), bearing (6), Nut (8). This invention comes with an integrated pulley (1) which has dust protection features in it. Pulley (1) is to connect the Electric motor shaft (7) to the engine crankshaft through a belt drive, said dust cap (3) comprises a bending portion (5) towards motor housing (9). The bending portion (5) of the dust cap (3) is slightly inclined towards the motor housing (9). There is a gap provided between the bending portion (5) of the dust cap (3) and motor housing (9). The dust cap (3) is slightly bent towards the motor housing with respect to plane z forming the bending portion (5). The purpose of the dust cap (3) in the pulley (1) is to protect the bearing (6) and other components inside and outside of the motor housing (9), from foreign/dust particles.
The said pulley (1) have a belt portion with or without grooves (i.e., non-slipping feature) also refered as pulley profiles (2) with Dust cap (3) or Debris Protection. The height of the dust cap (3) projection at the first portion of the pulley (1) refers to Plane A, whereas the height of the pulley (1) projection at the second portion refers to Plane B. The plane A is always greater than plane B for enhanced dust preventing feature. The Plane difference between pulley (1) and dust cap (3) (Plane A > Plane B). Integrated pulley (1) with an elongated feature in plane A. Shaft (7) includes pulley (1) at the end. Pulley (1) is connected to rotor shaft (7) end through the nut, the motor will drive the rotor to drive the shaft (7). Pulley (1) having first portion adjacent to the motor housing (9), and second portion at the other end. The dust cap (3) feature is integrated at the first portion of said pulley (1).
Motor housing (9) includes stator and rotor assembly, Rotor assembly comprises shaft (7), rotor, and bearing (6). Rotor assembly is assembled in a motor housing (9) through bearing (6). Once the rotor receives input current from the battery it will rotate the pulley (1) which is connected to the shaft (7).
The dust cap (3) feature will protect the bearing (6) grease from contamination and also hold the grease that surrounds the wheel bearing (6) in place. Also keeps the grease from evaporation/ dry out due to climate. Provide high-level protection against flexible wires and environmental contaminants in harsh conditions. Prevents dust entering into the chamber or rotor of the motor housing (9). For maintenance and cleaning is easy which will protect from the rust of components.
Fig 2 (a, b and c), represents Pulley (1) with the projected feature above the plane A will protect the bearing (6) and other components from dust or foreign material which is coming from the inside or outside of the motor housing (9).
Electric motor devices are usually enclosed in order to protect them from exposure to dust, debris and pollutants, which in turn can cause damage to the parts and can lead to malfunction. The bearing (6), fan, and other sub-assembly components forming the base supportive feature of the device it has to be protected from any foreign particles.
The present invention will protect the bearing (6), fan, and other sub-assembly components from dust/water/debris/any foreign particles from contamination. This design intends to integrate the splined pulley (1) with dust cap (3) feature in the pulley (1) to bring a more robust design, value addition to the component in cost-saving.

While the foregoing written description of the invention enables one of ordinary skill to make and use what is considered presently to be the best mode thereof, those of ordinary skill will understand and appreciate the existence of variations, combinations, and equivalents of the specific embodiment, method, and examples herein. The invention should therefore not be limited by the above described embodiment, method, and examples, but by all embodiments and methods within the scope of the invention as claimed.