DESC: FORM 2
The Patent Act 1970
(39 of 1970)
&
The Patent Rules, 2005

COMPLETE SPECIFICATION
(SEE SECTION 10 AND RULE 13)

TITLE OF THE INVENTION

“AUTOMOBILE POWER TRAIN HAVING ENGINE WITH INTEGRAL TRANSMISSION AND AIR CONDITIONING COMPRESSOR”

APPLICANTS:

Name Nationality Address
Mahindra & Mahindra Limited Indian Mahindra & Mahindra Ltd.,
MRV, Mahindra World City (MWC),
Plot No. 41/1, Anjur Post, Chengalpattu,
Kanchipuram District – 603204 (TN) INDIA

The following specification particularly describes and ascertains the nature of this invention and the manner in which it is to be performed:

TECHNICAL FIELD
[001] The embodiment herein generally relates to power train in vehicles and more particularly, but not exclusively to power train having engine with integral transmission unit in vehicles.

BACKGROUND
[002] Generally, power train refers to a group of components used for generating and delivering power for driving a vehicle. The main components of the power train are engine and transmission unit. Usually in a power train involving multi-cylinder engine, the engine and transmission unit are assembled together as separate units which requires more space and imparts more weight.
[003] In power train having engine with integral transmission unit, the transmission unit is integrated inside the crank case of the engine. In power train having engine with integral transmission unit the engine is usually a single cylinder engine. Using single cylinder engines in four wheeler vehicles having air conditioning systems is not efficient, as the single cylinder engine cannot sufficiently take the load provided by the air conditioning compressor due to less power.
[004] Therefore, there exists a need for a compact power train having a multi-cylinder engine with integral transmission unit that can drive an air conditioning compressor.
OBJECTS
[001] The principle object of an embodiment of this invention is to provide a power train having multi-cylinder engine with integral transmission unit for a vehicle.
[002] Another object of an embodiment of this invention is to provide a power train having multi-cylinder engine with integral transmission unit that can drive an air-conditioning compressor for a vehicle.
[003] Another object of an embodiment of this invention is to provide a power train that imparts low friction and has reduced weight leading to better fuel economy of the vehicle.
[004] Another object of an embodiment of this invention is to provide a power train having multi-cylinder engine having vertically split crankcase.
[005] Yet, another object of an embodiment of this invention is to provide a power train having engine that eliminates the need for a middle/centre bearing.
[006] These and other objects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF FIGURES
[007] This invention is illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[008] FIG. 1 depicts an exploded view of the power train, according to an embodiment of the invention as disclosed herein;
[009] FIG. 2 depicts a cross-sectional view of the multi-cylinder engine of the power train, according to an embodiment of the invention as disclosed herein;
[0010] FIG. 3 depicts a perspective view of the transmission unit of the power train, according to an embodiment of the invention as disclosed herein;
[0011] FIG. 4 depicts a side view of the power train, according to an embodiment of the invention as disclosed herein; and
[0012] FIG. 5 depicts a perspective view of the power train, according to an embodiment of the invention as disclosed herein.
DETAILED DESCRIPTION
[0013] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0014] The embodiments herein achieve a power train having multi-cylinder engine with integral transmission unit for a vehicle. Further, embodiments herein achieve a power train having multi-cylinder engine with integral transmission unit that can drive an air-conditioning compressor for a vehicle. Referring now to the drawings, and more particularly to FIGS. 1 through 5, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0015] FIG. 5 depicts a perspective view of the power train, according to an embodiment of the invention as disclosed herein. FIG. 1 depicts an exploded view of the power train, according to an embodiment of the invention as disclosed herein. The power train 100 includes an engine 102, a transmission unit 104, an air conditioning compressor 106 and an electric motor/generator 108.
[0016] FIG. 2 depicts a cross-sectional view of the multi-cylinder engine of the power train 100, according to an embodiment of the invention as disclosed herein. In an embodiment, the engine 102 comprises a plurality of pistons 102a, a plurality of connecting rods 102b, a cylinder block 103, a crankshaft 102d, a first bearing 102f, a second bearing 102g, a crankcase 105, an end cover 102j and a clutch cover 102k.
[0017] The cylinder block 103 is provided with a plurality of cylinders 102c for receiving the plurality of pistons 102a. Each of the pistons 102a slide inside each of the cylinders 102c. Each of the plurality of connecting rods 102b are connected with their corresponding pistons 102a and the crankshaft 102d i.e one end of each of the connecting rod 102b is connected with crankshaft 102d and the other end of the connecting rod 102b is connected with their corresponding piston 102a.
[0018] The first bearing 102f is used for supporting first end 102l of the crankshaft 102d and the second bearing 102g is used for supporting the second end 102m of the crankshaft 102d.
[0019] In an embodiment, the crankshaft 102d includes at least one counter weight (not shown) configured to provide balancing for the engine thereby reducing the vibrations produced by the engine 102 of the power train 100.
[0020] In an embodiment, the crankcase 105 includes a left hand side housing 102h and a right hand side housing 102i. The inner side of the left hand side housing 102h is adapted to hold the first bearing 102f and the inner side of the right hand side housing 102i is adapted to hold the second bearing 102g. The inner side of the left hand side housing 102h and the inner side of the right hand side housing 102i are adapted to receive the cylinder block 103 and the transmission unit 104. The left hand side housing 102h and the right hand side housing 102i are provided with flanges (not shown) adapted for receiving fasteners for facilitating the mounting of said engine 102.
[0021] In an embodiment the end cover 102j is used for covering transmission unit 104 and crank train components. The end cover 102j is provided outside the right hand side housing 102i. In an embodiment, the clutch cover 102k is adapted to enclose the clutch assembly 104a.
[0022] The engine 102 further comprises a plurality of inlet valves (not shown), a plurality of outlet valves (not shown), a plurality of camshafts (not shown), an inlet manifold (not shown), an exhaust manifold (not shown) and other well known standard components required for functioning of the engine 102. Further based on the requirement, the engine 102 can be provided with spark plugs or fuel injectors and other related components accordingly based on the nature/type of fuel used.
[0023] In an embodiment, the engine 102 is a two cylinder engine. However, it is also within the scope of the invention to provide the multi-cylinder engine with more than two cylinders without otherwise deterring the intended function of the engine 102 of the power train 100 as can be deduced from the description.
[0024] FIG. 3 depicts a perspective view of the transmission unit 104 of the power train 100, according to an embodiment of the invention as disclosed herein. The transmission unit 104 includes a clutch assembly 104a, a gear assembly 104b, a gear shifter unit 104c and a differential unit 104d.
[0025] The clutch assembly 104a is used for engaging and disengaging the engine 102 with the transmission unit 104. In an embodiment, the clutch assembly 104a is a multi-plate wet clutch. However, it is also within the scope of the invention to provide a dry clutch, single plate clutch, centrifugal clutch or any other type of clutch without otherwise deterring the intended function of the clutch assembly 104a as can be deduced from the description. The clutch assembly 104a is mounted on an input shaft (not shown) of the gear assembly 104b. The input shaft is driven by the crankshaft 102d.
[0026] The gear assembly 104b includes an Input shaft (not shown), a counter shaft (not shown), a plurality of gears (not shown) and other standard components. The counter shaft (not shown) is configured to provide required speed and drive direction through the gears (not shown) and transmits drive to the differential unit 104d.
[0027] The gear shifter unit 104c includes a shift lever (not shown), at least one shift rail (not shown), at least one shift fork (not shown), at least one synchronizer (not shown). The gear shifter unit 104c is adapted for selecting the respective gear required for various driving conditions of the vehicle.
[0028] The differential unit 104d gets drive from the output shaft (not shown) and transfers motion to wheels (not shown) through drive shafts (not shown). The inner side of the right hand side housing 102i receives the side of the transmission unit 104 with the differential unit 104d and the inner side of the left hand side housing 102h receives the side of the transmission unit 104 with the gear shifter unit 104c. The left hand side housing 102h is provided with an opening (not shown) to receive the shift lever of the gear shifter unit 104c. The clutch assembly 104a is provided outside the left hand side housing 102h of the engine 102.
[0029] FIG. 4 depicts a side view of the power train 100, according to an embodiment of the invention as disclosed herein.
[0030] The air conditioning compressor 106 is mounted outside the engine 102. The air conditioning compressor 106 is driven by the engine 102. In an embodiment a plurality of pulleys 200 and a belt 300 are used for transmitting power between the crankshaft 102d and the air conditioning compressor 106. However, it is also within the scope of the invention to provide gear mechanism or chain and sprocket mechanism for driving the air conditioning compressor 106 without otherwise deterring the intended function of the air conditioning compressor 106. One pulley 200 is mounted on the crankshaft 102d and the other pulley 200 is mounted on the shaft (not shown) of the air conditioning compressor 106 and the belt 300 is used for connecting the pulleys 200 for transmitting power as shown in Fig. 4. In an embodiment, the air conditioning compressor 106 is an anti-clockwise direction running air conditioning compressor 106. However, it is also within the scope of the invention to provide clockwise direction running air conditioning compressor 106.
[0031] In an embodiment the electric motor/generator 108 is used for cranking the engine 102 and for generating power from the engine 102. The electric motor/generator is driven by the crankshaft 102d.
[0032] The working of the power train 100 is as follows. The working of power train 100 is as follows. As a result of power stroke, the reciprocating motion of plurality of pistons 102a is converted into rotary motion of crankshaft 102d of engine 102. The speed and torque developed in the crankshaft 102d is transmitted to the gear assembly 104b via clutch unit 104a. The desired speed and torque is delivered to the output shaft (not shown) of gear assembly 104b by engaging the clutch assembly 104a and selecting the required gear by using the shift lever (not shown) of the gear shifter unit 104c. Thus the speed and torque obtained by the output shaft (not shown) is then transmitted to the differential unit 104d to drive the wheels of the vehicle (not shown) via drive shaft (not shown). Further the crankshaft 102d drives the air conditioning compressor 106 through the pulleys 200 and the belt 300 irrespective of the position of the shift lever (not shown) of the gear shifter unit 104c.
[0033] Thus a power train 100 for a vehicle having engine 102 with integral transmission unit 104 that can drive an air-conditioning compressor 106 is provided.
[0034] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

CLAIMS
We claim,
1. A power train for a vehicle, said power train comprising:
an engine comprising, a cylinder block having a plurality of cylinders, a crank shaft having a first end and a second end, a first bearing and a second bearing and a crankcase having a left hand side housing and a right hand side housing; and
a transmission unit integrated inside said engine, said transmission unit comprising a clutch assembly, a gear assembly, a gear shifter unit and a differential unit,
wherein
said cylinder block is received by an inner side of said left hand side housing and an inner side of said right hand side housing; said first end of said crankshaft is supported by said first bearing and said second end of said crankshaft is supported by said second bearing; said first bearing is held in said inner side of said left hand side housing and said second bearing is held in said inner side of said right hand side housing, and said transmission unit is integrated inside said engine between said inner side of said left hand side housing and said inner side of said right hand side housing.
2. A power train for a vehicle, said power train comprising:
an engine comprising, a cylinder block having a plurality of cylinders, a crank shaft having a first end and a second end, a first bearing and a second bearing and a crankcase having a left hand side housing and a right hand side housing;
a transmission unit integrated inside said engine, said transmission unit comprising a clutch assembly, a gear assembly, a gear shifter unit and a differential unit; and
an air conditioning compressor,
wherein
said cylinder block is received by an inner side of said left hand side housing and an inner side of said right hand side housing; said first end of said crankshaft is supported by said first bearing and said second end of said crankshaft is supported by said second bearing; said first bearing is held in said inner side of said left hand side housing and said second bearing is held in said inner side of said right hand side housing, and said transmission unit is integrated inside said engine between said inner side of said left hand side housing and said inner side of said right hand side housing; and said air conditioning compressor is adapted to be driven by said engine.
3. The power train as claimed in claim 1, further comprising an air conditioning compressor adapted to be driven by said engine.
4. The power train as claimed in claim 1, wherein said left hand side housing, comprises a plurality of flanges adapted for receiving fasteners.
5. The power train as claimed in claim 1, wherein said right hand side housing comprises a plurality of flanges adapted for receiving fasteners.
6. The power train as claimed in claim 1, further comprising an electric motor/generator.
7. The power train as claimed in claim 1, wherein said crankshaft comprises at least one counterweight adapted for balancing said engine.
8. The power train as claimed in claim 1, wherein said air conditioning compressor is adapted to be driven in anti-clockwise direction.
9. The power train as claimed in claim 1, wherein said cylinder block includes at least two cylinders.


Date:13th NOVEMBER 2015 Signature:
Kalyan Chakravarthy

ABSTRACT

Engine with integral transmission unit for a vehicle includes an engine, a transmission unit and an air conditioning compressor. The transmission unit is integrated inside engine leading to a compact power train that imparts low friction and reduced weight resulting in better fuel economy of the vehicle. The engine with integral transmission unit drives the air conditioning compressor.
Fig. 5

,CLAIMS:CLAIMS
We claim,
1. A power train for a vehicle, said power train comprising:
an engine comprising, a cylinder block having a plurality of cylinders, a crank shaft having a first end and a second end, a first bearing and a second bearing and a crankcase having a left hand side housing and a right hand side housing; and
a transmission unit integrated inside said engine, said transmission unit comprising a clutch assembly, a gear assembly, a gear shifter unit and a differential unit,
wherein
said cylinder block is received by an inner side of said left hand side housing and an inner side of said right hand side housing; said first end of said crankshaft is supported by said first bearing and said second end of said crankshaft is supported by said second bearing; said first bearing is held in said inner side of said left hand side housing and said second bearing is held in said inner side of said right hand side housing, and said transmission unit is integrated inside said engine between said inner side of said left hand side housing and said inner side of said right hand side housing.
2. A power train for a vehicle, said power train comprising:
an engine comprising, a cylinder block having a plurality of cylinders, a crank shaft having a first end and a second end, a first bearing and a second bearing and a crankcase having a left hand side housing and a right hand side housing;
a transmission unit integrated inside said engine, said transmission unit comprising a clutch assembly, a gear assembly, a gear shifter unit and a differential unit; and
an air conditioning compressor,
wherein
said cylinder block is received by an inner side of said left hand side housing and an inner side of said right hand side housing; said first end of said crankshaft is supported by said first bearing and said second end of said crankshaft is supported by said second bearing; said first bearing is held in said inner side of said left hand side housing and said second bearing is held in said inner side of said right hand side housing, and said transmission unit is integrated inside said engine between said inner side of said left hand side housing and said inner side of said right hand side housing; and said air conditioning compressor is adapted to be driven by said engine.
3. The power train as claimed in claim 1, further comprising an air conditioning compressor adapted to be driven by said engine.
4. The power train as claimed in claim 1, wherein said left hand side housing, comprises a plurality of flanges adapted for receiving fasteners.
5. The power train as claimed in claim 1, wherein said right hand side housing comprises a plurality of flanges adapted for receiving fasteners.
6. The power train as claimed in claim 1, further comprising an electric motor/generator.
7. The power train as claimed in claim 1, wherein said crankshaft comprises at least one counterweight adapted for balancing said engine.
8. The power train as claimed in claim 1, wherein said air conditioning compressor is adapted to be driven in anti-clockwise direction.
9. The power train as claimed in claim 1, wherein said cylinder block includes at least two cylinders.


Date:13th NOVEMBER 2015 Signature:
Kalyan Chakravarthy