received by the International Bureau on 13 October 2020 (13.10.2020)

We Claim:

1. [Amended] An engine (100) comprising:

a crankcase (123) enclosing a hybrid transmission system;

said hybrid transmission system operable by a shifting mechanism configured with:

at least one clutch shaft assembly (102);

at least one drive shaft assembly (103), said drive shaft assembly (103) being parallel and alongside the clutch shaft assembly (102);

a clutch member (213), said clutch member (213) being operable to establish a driving connection between the clutch shaft assembly (102) and a crankshaft (114); a low torque system being configured to operate on a lug and slot mechanism, said low torque system provides forward driving path from the clutch shaft assembly (102) to the drive shaft assembly (103) with a predetermined reduction gear ratio range; and

a high torque system, said high torque system provides forward driving path from the clutch shaft assembly (102) to the drive shaft assembly (103) with a predetermined reduction gear ratio range,

wherein said high torque system comprises a high torque output gearing, said high output gearing includes at least one synchromesh sleeve assembly (219).

2. The engine (100) as claimed in claim 1, wherein said high torque system provides reduction gear ratio ranges from 3.0 to 1.0.

3. The engine (100) as claimed in claim 1, wherein said low torque system provides reduction gear ratio ranges from 1.5 to 0.5.

4. [Amended] The engine (100) as claimed in claim 1, wherein said high torque system comprises:

a high torque input gearing, said high torque input gearing includes:

at least two drive gears (214, 216) installed on the clutch shaft assembly (102), and

said high torque output gearing, said high torque output gearing includes:

at least two driven gears (207, 208) installed on the drive shaft assembly (103), said driven gears (207, 208) are operatively connected to at least one of said drive gear; and

wherein said synchromesh sleeve assembly (219) being movably installed on the drive shaft assembly (103) to engage a predetermined gear selectively.

5. [Amended] The engine (100) as claimed in claim 1, wherein said low torque system comprises:

a low torque input gearing, said low torque input gearing includes: at least two fixed drive gears (215, 218) installed on the clutch shaft assembly (102),

said fixed drive gear (215, 218) configured to have lugs or slot selectively,

at least two movable drive gear (216, 217) installed on the clutch shaft assembly (102),

said movable drive gear (216, 217) configured to have lugs or slots, and,

a low torque output gearing, said low torque output gearing includes:

at least one fixedly installed driven gears (209) installed on the drive shaft assembly (103),

26 said driven gear (209) configured to have lugs or slots selectively,

at least one movable driven gear (210) installed on the drive shaft assembly (103),

said driven gear (210) configured to have both lugs and slots;

wherein movably installed drive gear (217) and movable installed driven gear (210) being configured to have slots or lugs to engage with the lugs or slots of predetermined driven gear selectively.

6. [Amended] The engine (100) as claimed in claim 5, wherein said two movable gears (216, 217) being integrated as single unit (216, 217).

7 [Amended] The engine (100) as claimed in claim 1, wherein said high torque transmission system comprises:

a first drive gear (214) installed on the clutch shaft assembly (102) and engaged with a first driven gear (207),

a second drive gear (216) movably installed on the clutch shaft assembly (102) and engaged with a second driven gear (208),

said second drive gear (216) configured to have plurality of lugs (216a) to engage with the corresponding slots (215a) of an adjacent third drive gear (215),

said third drive gear (215) engaged with said synchromesh sleeve assembly (219),

said synchromesh sleeve assembly (219) being movably installed on the drive shaft assembly (103) to be selectively connected to the first driven gear (207) and the second driven gear (208) selectively.

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8. [Amended] The engine (100) as claimed in claim 1, wherein said low torque transmission system comprises:

a third drive gear (215) installed on said clutch shaft assembly (102) and engaged with said synchromesh sleeve assembly (219),

said third drive gear (215) being fixedly mounted configured to have slots (215a) in order to engage with corresponding lug (216a) of an adjacent second drive gear (216),

a fourth drive gear (218) installed on the clutch shaft assembly (102) and engaged with a fourth driven gear (210),

said fourth drive gear (218) being fixedly mounted on the clutch shaft assembly (102) being configured to have projected lugs (218a) to engage with the corresponding slot (217a) of an adjacent fifth drive gear (217),

said fifth drive gear (217) being movably installed on the clutch shaft assembly (102) and engaged with a fifth driven gear (209) to selectively engage with the fourth drive gear (218),

wherein said fifth drive gear (217) being integrated with the second drive gear (216).

9. [Amended] The engine (100) as claimed in claim 8, wherein said fourth driven gear (210) being movably installed on the drive shaft assembly (103), said fourth driven gear (210) being configured to have projected lugs (210a) to engage with a corresponding slot (211a) of an adjacent reverse driven gear (211).

10. [Amended] The engine (100) as claimed in claim 9, wherein said reverse driven gear (211) being fixedly installed on the drive shaft assembly (103).

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11. [Amended] The engine (100) as claimed in the claim 9 or claim 10, wherein said reverse driven gear (211) being engaged with an idler gear (101), said idler gear (101) being installed on the idler shaft (124). 12. [Amended] The engine (100) as claimed in claim 10, wherein said idler gear (101) being engaged with a reverse drive gear (220), said reverse drive gear (220) being fixedly installed on the clutch shaft assembly (102).

13. [Amended] The engine (100) as claimed in claim 1, wherein said clutch member (213) being installed on the clutch shaft assembly (102).

14. A vehicle configured with a hybrid H - Shifting mechanism as per any of the preceding claims.

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