FIELD OF INVENTION

The present invention relates generally to a power unit of hybrid two wheeled vehicle and more particularly to an arrangement of an internal combustion power unit and an electrical power unit.

BACKGROUND OF THE INVENTION

A conventional power unit for a hybrid two wheeled vehicle generally involves an internal combustion power unit and an electrical power unit wherein the two can be operated separately. For internal combustion power unit cooling is mandatory requirement as the entire transmission system observe high friction, hence the chamber for this power unit and more specifically for associated transmission system should be wet so that the transmission assembly can be dipped into the lubricating oil and a smooth functioning can be achieved by minimising the friction, and because of this reason electrical power unit cannot be kept in the same casing as it requires a dry place to work properly, hence a different casing for the electrical power unit is required which increases the cost of manufacturing as well as the weight of the power unit assembly due to which more space to place power unit assembly is required.
Even if the two power units are to be kept in the same casing in separate chambers the casing becomes complex and bulky. This results in a bulky rear portion of the vehicle and due to which the problems like ground clearance high manufacturing cost and more space requirement arises.

SUMMARY OF THE INVENTION

An objective of the present invention is to provide a hybrid power supply system for a two wheeled vehicle having a crankcase unit, an internal combustion power unit, an electrical power unit along with the associated transmission system. The internal combustion power unit is housed in the front portion of the crankcase unit and the electrical power unit is housed in the rear portion of the crankcase unit. The transmission system transmits the torque produced by the internal combustion power unit to the rear wheel shaft of the hybrid two wheeled vehicle or the torque produced by the electrical power unit to the rear wheel shaft of the hybrid two wheeled vehicle. Said transmission system has a first transmission mechanism for the internal combustion power unit and a second transmission mechanism for the electrical power unit, further having a first transmission drive mechanism supported by support wall and a second transmission drive mechanism secured aligned to the axis of rotation of the rear wheel shaft.

Another objective of the claimed invention is to provide mentioned power supply system with transmission drive mechanism having multiple axis of rotation where primary driven axis lies between the axis of rotation of crankshaft and axis of rotation of the wheel shaft and axis of rotation of crankshaft and primary driven axis are in a plane and axis of rotation of the wheel shaft lies below said plane.

BRIEF DESCRIPTION OF DRAWINGS

The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings which are incorporated in and constitute embodiments of the invention, illustrate several aspects of the invention and together with a description of the embodiments serve to explain the principles of the invention and thus, are not limited of the present invention and a brief description of the drawings is as follows:

Figure 1 is the cross-sectional view of the power unit of the hybrid two wheeled vehicle, depicting an arrangement of the embodiments of the invention.

Figure 2 is showing the claimed power unit, in order to explain the arrangement of the torque transmission systems for the internal combustion power unit and the electrical power unit.

Figure 3 is the illustrative view of the crankcase of the claimed power unit, depicting the casing arrangement of the internal combustion power unit and its transmission system and the casing arrangement of the electrical power unit and its transmission system.

DETAILED DESCRIPTION OF THE INVENTION

The embodiments disclosed below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art may utilize their teachings. The invention may have application to all types of two wheeled vehicles.

Figure 1 is the cross-sectional view of the power unit of the hybrid two wheeled vehicle wherein the internal combustion power unit is housed in the front portion (F) of the vehicle and the electrical unit is housed in the rear portion (R) of the vehicle. The internal combustion power unit generates power by the combustion of the fuel inside the combustion chamber (102) with the pressure creation and release procedure because of the movement of the piston (103) inside the cylinder.

Produced power is transmitted to the crankshaft (112) through the piston (103) and from there the torque is transferred to the driven gear (105) through the clutch (114) mechanism, further the drive shaft (111) transmits the torque to the drive sprocket (115) from where the torque is transmitted to the driven sprocket (109) through the transmission chain (110), wherein the drive sprocket (115), driven sprocket (110) and the drive chain (109) are exemplary embodiments of the transmission drive mechanism for the internal combustion power unit. The driven sprocket (110) is coupled with the wheel shaft (106). Further the electrical power unit is housed in the rear portion (R) of the crankcase unit wherein the stator (107) of the electrical power unit is housed in the crankcase rear portion (R) and the rotor (108) is housed on the wheel shaft (106).

Figure 2 is explaining the arrangement of the torque transmission systems for the internal combustion power unit and the electrical power unit wherein the clutch (209) gets coupled with the crankshaft (215) and transmits the torque to the output shaft (207) through the primary driven gear (208). Said output (207) shaft is coupled with the primary sprocket (206) and said sprocket is connected with the driven sprocket (203) with the help of a chain (205), the driven sprocket (203) is coupled with the wheel shaft (204) and hence the rear wheel (214) of the vehicle rotates when the internal combustion power unit is in working condition.

During electrical power unit working condition rotor (202) of the electrical power unit gets coupled with the wheel shaft (204) and directly rotates the rear wheel ( 214) of the vehicle , with the rotation of the wheel shaft ( 204) the driven sprocket (204) also rotates and hence the transmission drive mechanism gets activated but this reverse rotation does not activate clutch drive (209) as only the output shaft (207) rotates freely because of specific gear arrangement and hence two power unit does not work
simultaneously.

Figure 3 is the perspective view of the of the crankcase in order to describe the relation between the wheel shaft axis (307) and the electrical power unit rotor axis (307) in reference of the location of the electrical power unit in the crankcase rear (R). The electrical power unit is secured in the wheel shaft chamber (308) over the electrical power unit bosses (304,305, 306) resulting the specific location of the electrical power unit, the wheel shaft and the electrical power unit rotor lies in same axis (307) which is in the transverse direction of the crankcase. Further, Figure 3 is explaining the positions of the crank shaft axis (310), primary driven axis (309) and wheel shaft axis (307) relative to a plane AA'.

The crank shaft axis (310) and the primary driven axis (309) lies in said plane wherein the plane lies in the horizontal orientation (AA') to the crankcase. The wheel shaft axis (307) lies below the said plane AA' and connecting the primary driven axis in the line of ray B. The wheel shaft axis (307), primary driven axis (309) and the crankshaft axis (310) lies in the transverse direction of the crankcase as well as the primary driven axis (305) lies between the crankshaft axis (311) and the wheel shaft axis (308). The wheel shaft axis (407) is aligned to the axis of the rotor of the electric power unit as the wheel shaft (204) and the rotor (202 in Figure 2) are coupled directly.

While the invention has been described with reference to an exemplary embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof.

Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.

WHAT IS CLAIMED IS:

1) A power supply system for a two wheeled vehicle comprising:

a) a crankcase unit with a front part and a rear part spaced apart by a support wall;

b) a plurality of power unit secured in the crankcase unit;

c) a transmission system transmitting torque from the plurality of power unit to a rear wheel shaft by means of a transmission mechanism comprising a first transmission drive mechanism supported by the support wall, a second drive mechanism secured aligned to axis of rotation of the rear wheel shaft;

wherein, the first transmission comprises a plurality of axis of rotation defining an axis of rotation of a wheel shaft secured between an axis of rotation of crankshaft and a primary driven axis such that the axis of rotation of crankshaft and the primary driven axis lies in a plane and the axis of rotation of the wheel shaft lies below said plane.

2) The power supply system, as claimed in claim 1, wherein the plurality of power unit defines an internal combustion power unit and an electrical power unit.

3) The power supply system, as claimed in claim 2, wherein the internal combustion power unit is secured inside the front part of the crankcase and the electrical power unit is secured inside the rear part of the crankcase.

4) The power supply system, as claimed in claim 2, wherein the internal combustion power unit and the electrical power unit are generating torque under predefined conditions.

5) The power supply system, as claimed in claim 1, wherein the first transmission drive mechanism is configured to transmit torque generated by the internal combustion power unit.

6) The power supply system, as claimed in claim 1, wherein the second transmission drive mechanism is configured to transmit the torque generated by the electrical power unit.

7) The power supply system, as claimed in claim 1, wherein the plurality of axis of rotation lies in width-wise direction of the crankcase unit.

8) The power supply system, as claimed in claim 1, wherein the plane lies in horizontal orientation of the crankcase unit.