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

“A CYLINDER HEAD ASSEMBLY FOR A VEHICLE”

APPLICANTS:
Name Nationality Address
Mahindra & Mahindra Limited Indian Mahindra Research Valley, Mahindra World, City Plot No. 41/1, Anjur P.O. Chengalpattu, Kancheepuram Dist, Tamilnadu.- 603204

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 embodiments herein generally relate to cylinder head in engines and more particularly but not exclusively to cylinder head having centrally positioned spark plug in engines.

BACKGROUND
[002] Generally, for multi-cylinder engines, single overhead camshaft (SOHC) having 4 valves per cylinder configuration are more advantageous as such configuration reduces the friction level in the engine. In the engines with aforementioned configuration, the valve operating mechanism includes a single camshaft extending above the cylinder head and positioned at the upper ends of the intake or exhaust valves, a rocker arm shaft disposed between the camshaft and the other valves, and rocker arms held in engagement with the camshaft and swingable about the rocker arm shaft. The upper ends of the intake or exhaust valves are engaged by the camshaft so that they can be opened and closed when the camshaft is rotated about its own axis. The upper ends of the other valves are engaged by the rocker arms and openable and closable by swinging movement of the rocker arms caused by rotation of the camshaft.
[003] Further, for multi-cylinder engines with single overhead camshaft (SOHC) having 4 valves per cylinder configuration, the spark plug is usually located at the side and hence reduces the combustion efficiency.
[004] A centrally located spark plug increases combustion efficiency and suppresses knocking. However, having the spark plug located centrally is challenging because of the complexity of assembly.
[005] Therefore, there exists a need to centrally position the spark plug in multi-cylinder engines with SOHC having 4 valves per cylinder configuration.

OBJECTS
[006] The principal object of an embodiment of this invention is to reduce friction and improve combustion efficiency in a multi-cylinder engine with SOHC having 4 valves per cylinder configuration.
[007] Another object of an embodiment of this invention is to provide a centrally positioned spark plug enabling better combustion.
[008] 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
[009] The embodiments are illustrated in the accompanying drawings, through out 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:
[0010] Fig. 1 depicts a perspective view of a cylinder head assembly, according to an embodiment of the invention as disclosed herein;
[0011] Fig. 2 depicts a cross-sectional view of the cylinder head assembly, according to an embodiment the invention as disclosed herein; and
[0012] Fig. 3 depicts a cross-sectional view of a cylinder head, according to an embodiment 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 reduced friction and higher combustion efficiency by providing central spark plug in the multi-cylinder engine with SOHC having 4 valves per cylinder configuration. Referring now to the drawings, and more particularly to FIGS. 1 through 2, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0015] Fig. 1 depicts a perspective view of the cylinder head assembly 100, according to an embodiment of the invention as disclosed herein. Fig. 3 depicts a cross-sectional view of a cylinder head 102, according to an embodiment the invention as disclosed herein.
[0016] The cylinder head assembly 100 includes a cylinder head 102, a plurality of sleeves 104, a plurality of spark plugs 106, a valve train (not shown) and a plurality of sealing elements (not shown).
[0017] The valve train (not shown) includes a single overhead camshaft 108a, a rocker arm shaft 108b, a plurality of first rocker arms 108f, a plurality of second rocker arms 108s, a plurality of intake valves (not shown), a plurality of intake valve springs 108v, a plurality of exhaust valves (not shown), a plurality of exhaust valve springs (not shown) and other well known standard components required for functioning of the valve train (not shown).
[0018] The cylinder head 102 includes a plurality of first counter bore 102f, a plurality of second counter bore 102s and a plurality of a portion of combustion chambers 102c. In an embodiment, each of the spark plug 106 having a face 106f is adapted to be disposed to each of the first counter bore 102f of the cylinder head 102. However, it is also within the scope of the invention to dispose a plurality of fuel injectors to the cylinder head 102 without otherwise deterring the intended function of plurality of spark plugs 106 as can be deduced from the description. Further, in an embodiment, each of the spark plug 106 includes an opening 106o exposed substantially to a center location of corresponding portion of combustion chambers of cylinder head 102.
[0019] Each of the sleeve 104 is adapted to enclose each of the spark plug 106. In an embodiment, each of the sleeve 104 having a lower portion 104a is adapted to be disposed to each of the second counter bore 102s of the cylinder head 102. Further, in an embodiment, the plurality of sleeves 104 is made from metal. However, it is also within the scope of the invention to provide the plurality of sleeves 104 to be made from any other material without otherwise deterring the intended function of the plurality of sleeves 104 as can be deduced from the description.
[0020] In an embodiment, each of the sleeve 104 is located between each of the first rocker arm 108f about an angle of inclination from a top surface 102t of cylinder head 102. However, it is also within the scope of the invention to provide each of the sleeve 104 located between each of the second rocker arms 108s about an angle of inclination from the top surface 102t of cylinder head 102 without otherwise deterring the intended function of each of the sleeve 104 as can be deduced from the description.
[0021] In an embodiment, each of the sealing elements (not shown) is adapted to be secured to a top portion of each of the sleeves 104. Further, the plurality of sealing elements (not shown) is made from rubber. However, it is also within the scope of the invention to provide the plurality of sealing elements (not shown) to be made from any other material without otherwise deterring the intended function of the plurality of sealing elements (not shown) as can be deduced from the description.
[0022] Fig. 2 depicts a cross-sectional view of the cylinder head assembly 100, according to an embodiment the invention as disclosed herein. In an embodiment, a longitudinal axis of each of the intake valve spring 108v is substantially parallel to a longitudinal axis of each of the sleeve 104.
[0023] Further, in an embodiment, a longitudinal axis of each of the each of the sleeve 104 and a longitudinal axis of each of the spark plug 106 is substantially co-axial to each other.
[0024] 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 cylinder head assembly for an engine comprising:
a cylinder head; said cylinder head including a plurality of first counter bore, a plurality of second counter bore and a plurality of a portion of combustion chambers;
a plurality of spark plugs, each of said spark plug having a face adapted to be disposed to each of said first counter bore of said cylinder head,
a plurality of sleeves, each of said sleeve having a lower portion adapted to be disposed in each of said second counter-bore of said cylinder head; and
a valve train, said valve train comprising a single overhead camshaft, a rocker arm shaft, a plurality of first rocker arms, a plurality of second rocker arms, a plurality of intake valves, a plurality of intake valve springs and a plurality of exhaust valves,
wherein
each of said sleeve is adapted to enclose each of said spark plug.
2. The cylinder head assembly as claimed in claim1, wherein each of said spark plug further defines an opening exposing a center location for each of said portion of combustion chamber of said cylinder head.
3. The cylinder head assembly as claimed in claim1, wherein each of said sleeve is located between each of said first rocker arm about an angle of inclination from a top surface of said cylinder head.
4. The cylinder head assembly as claimed in claim1, wherein a longitudinal axis of each of said intake valve spring is substantially parallel to a longitudinal axis of each of said sleeve.
5. The cylinder head assembly as claimed in claim1, wherein said longitudinal axis of each of said sleeve and a longitudinal axis of each of said spark plug is substantially co-axial to each other.
6. The cylinder head assembly as claimed in claim 1, further comprising a plurality of sealing elements adapted to be secured to a top portion of each of said sleeve.


Dated this 27th November 2015

Signatures:
Name of the Signatory: Dr. Kalyan Chakravarthy

ABSTRACT
A cylinder head assembly for a vehicle includes a cylinder head, a plurality of sleeves, a plurality of spark plugs, a valve train and a plurality of sealing elements. Each of the sleeve is adapted to enclose each of the spark plug. Each of the spark plug includes an opening exposed substantially to a center location of each of corresponding portion of combustion chambers and thereby resulting in better combustion.

,CLAIMS:CLAIMS
We claim,
1. A cylinder head assembly for an engine comprising:
a cylinder head; said cylinder head including a plurality of first counter bore, a plurality of second counter bore and a plurality of a portion of combustion chambers;
a plurality of spark plugs, each of said spark plug having a face adapted to be disposed to each of said first counter bore of said cylinder head,
a plurality of sleeves, each of said sleeve having a lower portion adapted to be disposed in each of said second counter-bore of said cylinder head; and
a valve train, said valve train comprising a single overhead camshaft, a rocker arm shaft, a plurality of first rocker arms, a plurality of second rocker arms, a plurality of intake valves, a plurality of intake valve springs and a plurality of exhaust valves,
wherein
each of said sleeve is adapted to enclose each of said spark plug.
2. The cylinder head assembly as claimed in claim1, wherein each of said spark plug further defines an opening exposing a center location for each of said portion of combustion chamber of said cylinder head.
3. The cylinder head assembly as claimed in claim1, wherein each of said sleeve is located between each of said first rocker arm about an angle of inclination from a top surface of said cylinder head.
4. The cylinder head assembly as claimed in claim1, wherein a longitudinal axis of each of said intake valve spring is substantially parallel to a longitudinal axis of each of said sleeve.
5. The cylinder head assembly as claimed in claim1, wherein said longitudinal axis of each of said sleeve and a longitudinal axis of each of said spark plug is substantially co-axial to each other.
6. The cylinder head assembly as claimed in claim 1, further comprising a plurality of sealing elements adapted to be secured to a top portion of each of said sleeve.