TECHNICAL FIELD
[0001] The present subject matter, in general, relates to an internal combustion engine with automatic transmission for a two-wheeled vehicle, and in particular, relates to the automated manual transmission (AMT) engine assembly and layout.
BACKGROUND
[0002] There have been various types of two-wheeled vehicles. One .such type
of vehicle is a step-through type- vehicle. The step-through type vehicles is
provided with a floorboard portion where the rider rests his feet or uses the
floorboard portion as storage space. This type of vehicle layout is provided with
f swinging power unit. Further, the power unit is coupled with a continuously
variable transmission (CVT). The CVT transmission eliminates the need for
operating clutch and gear. Therefore, the vehicles with CVT are preferred more
over the motorcycle type of vehicle for its convenience of ride, which does not
include the hassle of clutch operation or gear shifting. Moreover, certain vehicles
are geared scooters, in this type of vehicle the transmission from the crankshaft to
wheel shaft is through multiple set of gears. Even though the geared scooter
provides relatively better fuel economy, these type of vehicles are not preferred by
users due to hassles of manual clutch operation and gear shifting requirement
especially in traffic condition.
[0003] However, CVT has limitations due to hysteresis loss and transmission
losses. Also, the performance of such systems is compromised to improve rider
comfort. The fuel efficiency of such systems is generally less than that of a geared
system. Further, the continuous running of the belt in CVT system leads to
increase in temperature and thereby resulting in poor life of belt.
[0004] Generally, automatic and semi-automatic transmission systems have
come into the use for ease of operation of gear-shift and clutch actuation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] The detailed description is described with reference to the accompanying
figures

[0006] Fig. 1 illustrates a step-through type two-wheeled vehicle, in accordance
with an embodiment of the present subject matter.
[0007] Fig. 2 (a) illustrates a left side perspective view of the automatic
transmission engine, in accordance with an embodiment of the present subject
matter.
[0008] Fig. 2 (b) depicts a left side view of the automatic transmission engine,
in accordance with the embodiment illustrated in Fig. 2 (a).
[0009] Fig. 2 (c) depicts another left side perspective view of a power train of
the automatic transmission engine.
[00010] Fig. 2 (d) depicts a right side perspective view of the power train of the
automatic transmission engine.
[00011] Fig. 2 (e) depicts cross-sectional view of the automatic transmission ■
engine. ....
DETAILED DESCRIPTION
[00012] Generally, the semi-automatic or automatic transmission systems known in the art provide ease of operation of gearshift and clutch actuation. The engine is provided with an automatic transmission system that is mounted to the .engine. Generally, the engine is provided with clutch assembly, gearshift assembly, and the transmission system that are disposed on lateral sides of the engine. This makes the engine bulkier. Further, this type of automatic transmission engine assembly is mounted to a swing arm that further rotatably supports the rear wheel. Thus, a swing arm is additionally required. [00013] Moreover, such type of automatic transmission engine gets heated up because of operation of various electrical and mechanical components, and in addition due to the combustion process in the engine. This excess heat affects the performance of the engine whereby the performance of the engine is affected. Moreover, in the vehicle with a floorboard portion, most of the automatic transmission engine is enclosed by plurality of panels. This further reduces the dissipation of heat from the automatic transmission engine, thereby affecting performance.

[00014] Still further, the bulkier layout of the automatic transmission engine is
disposed in an anterior portion of the rear wheel. As a result, because of the
bulkier engine, the rear wheel is disposed further rearward from the floorboard,
which increases the wheelbase of the vehicle. Therefore, the ridabilty of the
vehicle is affected.
[00015] Additionally, out of the several packaging related issues faced in such
AMT vehicles, accommodating other vehicle systems including a cooling system,
exhaust system, ignition system having a kick-start or a start motor, or provision
of utility space is also challenging due to the bulkier engine layout.
[00016] Therefore the challenge is to provide an engine assembly, more
particularly an automatic transmission engine assembly for a step through-type
two-wheeled vehicle with optimum layout.
[00017] The present invention is directed to overcoming one or more problems •
including the problems as set forth above. Hence, it is an object of the present
invention to provide an internal combustion engine with automatic transmission.
The automatic transmission engine is provided with the transmission system
including the clutch assembly, gear train assembly disposed optimally towards
one .lateral side of the engine. That is to say, the transmission system is
substantially disposed to one side of the piston axis.
[00018] It is an aspect of the present subject matter that the clutch assembly is
disposed on to one lateral side of the engine and is positioned rearwardly of the
crankshaft. It is an additional aspect that a lateral end portion of the crankshaft is
connected to the clutch assembly through a belt drive.
[00019] It is an advantage that the need for use of multiple gears with increasing
radius, for providing required torque to the clutch assembly is eliminated by
disposing the clutch assembly substantially rearward to the crankshaft.
[00020] It is yet another aspect that the gear train assembly is disposed
adjacently or in proximity to the clutch assembly. A clutch shaft of the clutch
assembly and a gear shaft of the gear train assembly are disposed in lateral
direction and the gear shaft is disposed rearwardly of the clutch shaft.

[00021] It is an additional aspect of the present subject matter that the wheel
shaft is disposed rearwardly of the gear shaft.
[00022] It is yet an additional aspect of the present subject matter that a
transmission case is disposed on one lateral side of the engine and the
transmission extends from the crankcase towards the rear wheel shaft.
[00023] It is a feature of the present subject matter that the transmission case of
the crankcase supports the clutch assembly, the gear train assembly, and the rear
wheel. It is an additional advantage that the need for a swing arm is eliminated as
the transmission case acts as the swinging unit supporting the aforementioned
assembly.
[00024] It is additional feature that the automatic transmission engine is
provided with a layout that provides sufficient banking angle for the vehicle.
[00025] It is an additional feature- that, ■ the laterally disposed automatic •
transmission layout improves packing the vehicle parts and system including a
cooling system, an exhaust assembly, and a utility box as the automatic
transmission system is disposed one lateral side and towards one side of the piston
axis.
[00026] It is an advantage of the present subject matter that the dispersed layout
of the power train provides improved heat dissipation and improved cooling. It is
an additional advantage that the performance of the system is improved due to
improved cooling. Also, the entire power train disposed on one lateral side
provides improved heat dissipation to atmosphere.
[00027] It is yet an additional aspect the clutch actuation motor and the gear
actuation motor are supported by the transmission case that is swingably
connected to the frame assembly. It is an additional advantage that the freedom of
mounting the clutch actuation motor and the gear actuation motor is improved.
[00028] It is another additional advantage that the other automatic transmission
is easily accessible for maintenance. Further, a transmission cover is provided
enclosing at least a portion of the automatic transmission power train. This
enables ease of access to the automatic transmission for maintenance and
servicing by removing the transmission cover itself.

[00029] It is yet another additional feature that the kick-start assembly is disposed rearwardly of the crankshaft and is functionally coupled to the crankshaft. Further, the kick-start system is optimally disposed between the crankshaft and the clutch assembly thereby providing a compact layout. [00030] It is an additional aspect that the power train of the automatic transmission disposed on one lateral side enables in retaining the rear wheel at optimal distance to the floorboard thereby retaining the wheelbase. Thus, it is an additional advantage that the ridabilty is improved due to the wheelbase. [00031] It is an additional aspect that the at least a portion of the power train of the automatic transmission is disposed adjacent to the rear wheel when viewed from vehicle side. Thus, the packaging of the rear wheel with respect to the engine ■ is compact. [00032] It is another feature-that the other system components like the cooling system, exhaust system, and other ancillary systems can be disposed on other lateral side of the engine.
[00033] In one embodiment, the automatic transmission engine comprises a crankshaft functionally connected to a reciprocating piston about the cylinder and the crankshaft rotatably supported by a crankcase of the automatic transmission engine. A clutch assembly comprises a clutch shaft and a gear train assembly is functionally connected to the clutch assembly that includes a gear shaft. A rear wheel shaft is functionally connected to a rear wheel of the vehicle. The clutch assembly is disposed on a first side of a piston axis, which is substantially parallel to the longitudinal axis of the vehicle.
[00034] In one embodiment, the clutch assembly is positioned rearwardly of the crankshaft in a longitudinal direction and the clutch assembly is functionally connected to the crankshaft through a belt drive. Substantial gap is provided between the crankshaft and the clutch assembly. The gear train assembly is disposed on the first side of the piston axis, which is on one lateral side. The gear train assembly functionally connects the clutch assembly to the rear wheel shaft. [00035] In one embodiment, the gear train assembly is positioned adjacently of the clutch assembly, which is either forward or rearward to the clutch assembly.

[00036] In one embodiment, at least a portion of the gear train assembly
overlaps with at least a portion of the clutch assembly when viewed from vehicle
side, which is a compact layout.
[00037] In one embodiment, the gear train assembly includes a gearshift
actuation motor disposed upward to the clutch assembly and the gearshift
actuation motor is coupled to a gearshift drum disposed above the gear train
assembly. The gearshift drum enables engagement of a gear.
[0003S] In one embodiment, the clutch assembly includes a clutch actuation
motor disposed adjacent to a clutch member and towards an outward lateral side
of the clutch member.
[00039] In one embodiment, the clutch actuation motor has a clutch motor axis
substantially perpendicular to a clutch shaft axis of the clutch assembly and the
•clutch actuation-motor is coupled to-the clutch shaft through a worm gear
member.
[00040] In one embodiment, the crankshaft is functionally connected to a starter
assembly and the starter assembly is disposed between the clutch assembly and
the crankshaft.
[00041] In one embodiment, the clutch shaft, and the gear drum the automatic
transmission engine are disposed at an offset to an imaginary horizontal plane
passing through a crankshaft axis of the crankshaft.
[00042] In one embodiment, the crankcase includes at least a portion extending
in a longitudinal direction of the vehicle supporting the rear wheel shaft, and the
crankcase is swingably connected to a frame member of the vehicle.
[00043] In one embodiment, the automatic transmission engine having the
clutch assembly includes a primary driven, wherein the crankshaft is connected to
the primary driven through the belt drive.
[00044] In one embodiment, the automatic transmission engine includes a
crankcase cover mounted to the crankcase on the first side and the crankcase
cover covers at least a portion of the clutch assembly, the gear train assembly, and
the crankshaft. The crankcase cover is detachable type and is fastened to the
transmission case of the crankcase.

[00045] The term two-wheeler used herein is for applicability of the present subject matter. However, the terms are not intended to limit the scope of the present subject matter and the essence of present subject is applicable to other compact vehicles with similar layout.
[00046] These and other advantages of the present subject matter would be described in greater detail in conjunction with the figures in the following description.
[00047] Fig. 1 illustrates a left side view of an exemplary vehicle 100, in accordance with an embodiment of the present subject matter. The vehicle 100 has a frame assembly 105 having a step-through type layout. The frame assembly 105 includes a head tube 105A, a main tube 105B extending downwardly rearward from the-head tube 105A, and a pair of railing 105C that extend inclinedly rearward. A handlebar assembly llOis mounted to a steering shaft (not -■• shown). The steering shaft is rotatably supported by the head tube 105A. A front wheel 115 is connected to the handle bar assembly 110 through one or more front suspension(s) 120. A power unit 200 is swingably mounted to the frame assembly 105. The power unit includes an automatic transmission engine assembly and the engine assembly is functionally coupled to a rear wheel 125. [00048] Further, the rear wheel 125 is connected to the frame assembly 105 through one or more rear suspension(s) 130. The engine assembly 200 is swingably connected to the frame assembly 105 through a toggle link (not shown). A seat assembly 135 is disposed upwardly of the engine assembly 200 and is supported by the pair of railings 105C. A storage compartment (not shown) provided below the seat assembly 135 are supported by the pair of railing(s) 105C. The utility box is accessible in an open condition of the seat assembly 135. [00049] Furthermore, the vehicle 100 is provided with plurality of panels 140A, 140B, and 140C. A floorboard 145 is disposed at a step-through space defined by the frame assembly 105. The user can operate the vehicle by resting feet on the floorboard 145, in a sitting position. A front fender 150 is covering at least a portion of the front wheel 110. In the present embodiment, the front fender 150 is integrated with the panels 140A. A rear fender 155 covers at least a portion of the

rear wheel 125. The front fender 150 and the rear fender 155 prevent splashing of dirt on to the vehicle parts and away from the vehicle 100. A fuel tank (not shown) is supported by the frame assembly 105 and is functionally coupled to the engine assembly 200. The vehicle 100 comprises of plurality of electrical/electronic components including a headlight 160A, a tail light 160B, a batter^' (not shown), a transistor controlled ignition (TCI) unit (not shown), an alternator (not shown), a starter motor (not shown.
[00050] Fig. 2 (a) illustrates a left side perspective view of the automatic transmission engine assembly 200, in accordance with an embodiment of the present subject matter. The engine.assembly 200 includes a crankcase 205 that support a cylinder body 210. A cylinder head 215 is mounted to the cylinder body 210. The cylinder head 215 and the cylinder body 210 define a cylinder portion ■ that guides a piston (not shown) having a reciprocating motion of. In the present • embodiment, a piston axis P-P' is forwardly inclined, wherein the engine assembly 200 is referred to as horizontal engine. Also, the piston axis P-P' is substantially parallel to the longitudinal axis F-R of the vehicle 100. [00051] The crankcase 205 is a casted part provided with plurality of apertures and the crankcase 205 rotatably supports a crankshaft 220. In addition, a bearing assembly (not shown) enables rotation of the crankshaft 220. The crankshaft 220 is functionally connected to the piston through a connecting rod 255 (as shown) in Fig. "2 (c). The reciprocating motion of the piston is converted into a rotator motion of the crankshaft 220. The engine assembly 200 includes a transmission case 225, which is part of the crankcase 205, is mounted to the crankcase 205, and is disposed on one lateral side of the crankcase 205. In a preferred embodiment, the transmission case 225 is disposed to the left lateral side of the crankcase 205. The transmission case 225 extends substantially in a longitudinal direction of the vehicle 100 with an offset from the longitudinal axis F-R of the vehicle 100, wherein the transmission case 225 extends towards a rotation axis of the rear wheel 125 of the vehicle 100. The transmission case 225 is casted part provided with plurality of apertures and cavities.

[00052] Further, the engine 200 includes a clutch assembly that is disposed rearwardly of the crankshaft 220 and is mounted to the transmission case 225. The clutch assembly 230 includes plurality of clutch plates and friction plates, a primary driven provided with annular tooth, and a clutch housing 230E. One lateral end of the crankshaft 220 is connected functionally to a primary driven 230A (shown in. Fig. 2 (c)) of the clutch assembly 230. Furthermore, a gear train assembly 240 is coupled to the clutch assembly 230. Specifically, the gear train .assembly 240 includes gear shaft 240S coupled to a-clutch shaft 230S of the clutch assembly 230. The gear shaft 240S and the clutch shaft 230S work in conjunction to provide variable gear ratios .thereby providing variable speed outputs. The gear train assembly 240 includes a gear drum 240D (shown in Fig. 2 (c)) provided with plurality of grooves that enables in engaging the clutch shaft
230S and gear-shaft--240S at different gear-ratio combinationsrThe clutch
assembly 230 enables engagement and disengagement of clutch shaft 230S with the crankshaft 220, wherein in the disengaged condition the gear drum 240D actuates gearshift or for bringing to neutral. The output of the gear train assembly 240, which is the sear shaft 240S connected to the rear wheel shaft 235 that drives the wheel 125.
[00053] The transmission case 225 disposed and mounted on a lateral side of the crankcase 205 supports the clutch assembly 230, the gear train assembly 240, the rear wheel shaft 235, and the rear wheel 125, wherein the transmission case 225 is disposed at an offset from the piston axis P-P[00054] Fig. 2 (b) depicts a left side view of the automatic transmission engine 200, in accordance with the embodiment depicted in Fig. 2 (a). The engine 200 is provided with a kick-start system 245 that is disposed rearwardly of the crankshaft 220 and is coupled to the crankshaft 220. A kick lever 245A is rotatably supported by the transmission case 225 that enables user to crank the engine 200. In an embodiment, a starter motor (not shown) is mounted to the crankcase 205 and is coupled to the crankshaft 220 for electrically starting the engine 200. Further, the clutch assembly 230 is disposed rearwardly of the crankshaft 220 and the kick-start system 245.

[00055] The clutch assembly 230 is functionally connected to the crankshaft 220 through a belt drive 250. The term belt drive is not limiting and includes similar drives like chain drive etc. For example, the belt drive is made of an elastic material. However, in another embodiment, a chain drive or the like is used as belt drive. The belt drive 250 comprises of plurality of teeth that engage with at least one gear, which is a primary drive, connected to the crankshaft 220 and with the primary driven 230A of the clutch assembly 230 having plurality of teeth. A clutch shaft axis passing through the clutch shaft is disposed with a vertical offset from an imaginary horizontal line passing through crankshaft axis. This enables . disposing the clutch assembly 230, concentrically provided with the clutch shaft 230S, compactly at the same time provides the required distance for transferring desired torque from the crankshaft 220 to the clutch assembly 230. The gear train
assembly 240 is disposed adjacently of the clutch assembly 230. In a preferred
embodiment, the gear train assembly 240 is disposed adjacently of the clutch housing 230E (as shown in Fig. 2 (c)). Further, the gear shaft 240S is engagingly disposed rearward to the clutch shaft 230S, wherein the gear shaft 240S and the clutch shaft 230S are disposed in the lateral direction LH-RH. Disposing the gear train assembly 240 in proximity to the clutch assembly 230 eliminates use of additional gears. Also, a gear shaft axis passing through the gear shaft is disposed upwardly of the imaginary horizontal line passing through the crankshaft axis. [00056] Fig. 2 (c) depicts a left side perspective view of the power train of the automatic transmission engine 200. Fig. 2 (d) depicts a right side perspective view of the power train of the automatic transmission engine 200. The clutch assembly 230 is disposed on one lateral side, say a first lateral side, of the crankcase 205. In other words, the clutch assembly 230 is disposed on one side of the piston axis P-P\ Further, one end of the crankshaft 220, which extends towards a first lateral side, is coupled to the clutch assembly 230. In the present embodiment, the first lateral side is on the left side with respect to the engine 200 or the vehicle 100. [00057] The clutch assembly 230 includes the clutch shaft 230S provided with plurality of gears that include affixed and freely rotating gears. The primary driven 230A of the clutch assembly 230 is connected to the crankshaft 220 by the

belt drive 250. The clutch shaft 230A is coupled to the gear shaft 240S provided with plurality of gears that area selectively affixed and freely rotating, wherein the gear train assembly 240 is also disposed on the first lateral side. The freely rotating gears provided on the clutch shaft 230S and gear shaft 240S are selectively engaged by a gear drum 240. The gear drum 240D is connected to a gear actuation motor 240C. The gear actuation motor 240C operates the gear drum 240D depending on user request and operating condition(s) of the vehicle 100.
[00058] The clutch actuator motor 230C is disposed adjacent to the clutch housing 230E and the clutch actuation motor 230C engages and disengages the clutch by receiving commands from an electronic control unit (not shown). During the disengaged condition of the clutch, the primary driven 230A rotates independent of the clutch-shaft 230S: The gear actuation motor 240G of the gear-train assembly enables rotation of the gear drum 240D that engages the clutch shaft 230S with the gear shaft 240S according to the angle of gear drum 240D the gear ratios are selected..The gear actuation motor 240C is disposed upwardly of the clutch assembly 230 and is disposed in a lateral direction RH-LH. In another embodiment, the gear actuation motor 240C is disposed in the longitudinal direction F-R using bevel gear assembly or worm gear assembly. Further, the power train assembly depicted is supported by the transmission case 225 (as shown in Fig. 2 (b)). Further, a transmission cover (not shown) is provided on the transmission case- 225 that encloses at least a portion of the automatic transmission.
[00059] Also, Fig. 2 (c) depicts that that clutch actuation motor 230C having a clutch motor axis C-C is substantially perpendicular to a clutch shaft axis B-B' of the clutch assembly 230. The clutch actuation motor 230C is coupled to the clutch shaft 230S through a worm gear member. The gear actuation motor 240C is having a gear shaft axis A-A' about which the gear shaft rotates and the gear shaft axis is parallel to the gear drum 240D.
[00060] Fig. 2 (e) depicts a cross sectional view of the automatic transmission engine 200 taken along axis X-X\ in accordance with the embodiment depicted in

Fig. 2 (a). The automatic transmission system is disposed to one side of the piston
axis P-P'. In other words, the automatic transmission system including the clutch
assembly 230 and the gear train assembly 240 are disposed on the lateral side of
the crankcase 205. Further, the clutch assembly 230 is connected to a lateral end
of the crankshaft 220 through the belt drive thereby eliminating the need for
plurality gears. In the top view the clutch shaft 230S. the gear shaft 240S, and the
rear wheel shaft 235 are adjacently positioned and are disposed in lateral direction
RH-LH of the vehicle 100. Also, the dispersed or spread out layout of the
automatic transmission engine 200 provides improved heat dissipation and
cooling. ' .
[00061] Further, the transmission case 225 supports the automatic transmission and also rotatably supports the rear wheel 125 thereby eliminating the need for swing arm. In* addition, the automatic transmission-engine 200 layout provides ample space on other side of the engine 200 or the other side of the piston axis P-P\ This provides improved space for accommodating vehicle systems including cooling system or exhaust system.
[00062] Further, the clutch shaft 220, the gear shaft 240S, and the rear wheel shaft are each disposed with an offset from an imaginary line/plane passing through the crankshaft axis. In other words, at least two of the crankshaft 220. the clutch shaft 230S, the gear shaft 240S, and the rear wheel shaft 235 are disposed at different heights thereby enabling the optimum layout of the engine 200. [00063] It is to be understood that the aspects of the embodiments are not necessarily limited to the features described herein. Many modifications and variations of the present subject matter are possible in the light of above disclosure. Therefore, within the scope of claims of the present subject matter, the. present disclosure may be practiced other than as specifically described.

We claim:
1. An automatic transmission engine (200) for a two-wheeled vehicle (100), said
automatic transmission engine (200) comprising:
a crankshaft (220) functionally connected to a reciprocating piston (201) "and said crankshaft (220) rotatably supported by a crankc'ase (205) of said automatic transmission engine (200);
a clutch assembly (230) comprising a clutch shaft (230S);
a gear train assembly (240) functionally connected to the clutch assembly (230) and said gear train assembly (240) comprising a gear shaft (240S); and
a rear wheel shaft (235) functionally connected to a rear wheel (125) of said vehicle (100),
wherein
said clutch assembly (230) is disposed on a first side (LH) of a piston axis (P-P') of said piston (201) and positioned rearwardly of the crankshaft (220) in a longitudinal direction (F-R), and said clutch assembly (230) is functionally connected to the crankshaft (220) through a belt drive (250), and said gear train assembly (240) is disposed on said first side (LH) of said piston axis (P-P*) and said gear train assembly (240) functionally connects said clutch assembly (230) to said rear wheel shaft (235).
2. The automatic transmission engine (200) as claimed in claim 1, wherein said gear train assembly (240) is positioned adjacently of said clutch assembly (230), and at least a portion of said gear train assembly (240) overlaps with at least a portion of the clutch assembly (230) when viewed from vehicle side.
3. The automatic transmission engine (200) as claimed in claim 1, wherein said gear train assembly (240) includes a gearshift actuation motor (240C) disposed

upward to the clutch assembly (230) and the gearshift actuation motor (240C) is coupled to a gearshift drum (240D) disposed above said gear train assembly (240) whereby said gearshift drum (240D) enables engagement of a gear.
4. The automatic transmission engine (200) as claimed in claim 1, wherein said clutch assembly (230) includes a clutch actuation motor (230C) disposed adjacent to a clutch member (230E) and towards an outward lateral side of the clutch member (230E).
5. The automatic transmission engine (200) of claim 1 or 3, wherein said clutch actuation motor has a clutch motor axis'(C-C') substantially perpendicular to a clutch shaft axis (B-B') of the clutch assembly (230) and said clutch actuation motor (230C) is coupled to the clutch shaft (230S)_through a worm gear member.
6. The automatic transmission engine (200) as claimed in claim 1, wherein said crankshaft (220) is functionally connected to a starter assembly (245) and said starter assembly (245) is disposed between the clutch assembly (230) and the crankshaft (220).
7. The automatic transmission engine (200) as claimed in any of the preceding claims, wherein said clutch shaft, and said gear drum are disposed at an offset to an imaginary horizontal plane (H-H') passing through a crankshaft axis of said crankshaft (200).
8. The automatic transmission engine (200) as claimed in claim 1, wherein said crankcase (205) includes at least a portion (225) extending in a longitudinal direction (F-R) of said vehicle (100) supporting said rear wheel shaft (235), and said crankcase (205) is swingably connected to a frame member (105) of said vehicle (100).
9. The automatic transmission engine (200) as claimed in claim 1, wherein said clutch assembly (230) includes a primary driven (230A), wherein said crankshaft (220) is connected to said primary driven (230A) through said belt drive (250).

10. The automatic transmission engine (200) as claimed in claim 1, wherein said automatic transmission engine (200) includes a crankcase cover mounted to said crankcase on said first side (LH) and said crankcase cover covers at least a portion of said clutch assembly (230), said gear train assembly (240), and said crankshaft (220)."