Claims:WE CLAIM:
1. A fuel injection pump assembly (200) for an internal combustion engine (202), said assembly (200) comprising:
• a fuel injection pump (204) configured to supply fuel to said engine (202);
• mounting means configured to mount said pump (204) on the cylinder head (206) of said engine (202);
• coupling means to couple the pump shaft (208) of said pump (204) to the camshaft of the engine (202) for driving said pump (204).
2. The assembly (200) as claimed in claim 1, wherein said coupling means includes a gear mechanism configured to couple said camshaft to said pump shaft (208).
3. The assembly (200) as claimed in claim 2, wherein said gear mechanism includes a first gear (210) mounted on said camshaft, and a second gear (212) mounted on said pump shaft (208) and engaged with said first gear (210) to transmit power from said camshaft to said pump shaft (208).
4. The assembly (200) as claimed in claim 3, wherein said second gear (212) is mounted on said pump shaft (208) by means of a nut (214).
5. The assembly (200) as claimed in claim 1, which includes an O-ring to seal the interface bore provided between the cylinder head (206) and the assembly (200).
6. The assembly (200) as claimed in claim 5, wherein said O-ring is of elastomer.
, Description:FIELD
The present disclosure relates to the field of fuel injection pumps.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
A fuel injection pump is employed to pump fuel into the cylinders of a diesel engine. The fuel injection pump is driven by the engine with the help of a driving unit which includes gears. The pump is operated is such that the fuel is injected before the piston reaches near the top dead centre. Currently, the engines are provided with a bore in a crankcase of the engine for mounting the fuel injection pump therein. This configuration makes the synchronization of the fuel pump with the camshaft difficult. Further, the weight of the pump and the backlash between the gears of the driving unit of the fuel pump increases. Additionally, the current configuration of the pump with the engine is complex, as a result of which the engine needs to be dismantled in case of repair or maintenance.
There is therefore felt a need for a fuel injection pump assembly that alleviates the aforementioned drawbacks.
OBJECT
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
An object of the present disclosure is to provide a fuel injection pump assembly for an internal combustion engine.
Another object of the present disclosure is to provide a fuel injection pump assembly that provides easy accessibility to the pump.
Yet another object of the present disclosure is to provide a fuel injection pump assembly that is easily synchronized with a camshaft of the engine.
SUMMARY
The present disclosure envisages a fuel injection pump assembly for an internal combustion engine. The assembly comprises a fuel injection pump, mounting means and coupling means. The fuel injection pump is configured to supply fuel to the engine. The mounting means is configured to mount the pump on the cylinder head of the engine. The coupling means couples the pump shaft of the pump to the camshaft of the engine for driving the pump.
In an embodiment, the coupling means includes a gear mechanism configured to couple the camshaft to the pump shaft.
In another embodiment, the gear mechanism includes a first gear mounted on the camshaft, and a second gear mounted on the pump shaft and engaged with the first gear to transmit power from the camshaft to the pump shaft.
In yet another embodiment, the second gear is mounted on the pump shaft by means of a nut to facilitate transmission of power from the camshaft to the pump shaft.
In one embodiment, the assembly includes an O-ring to seal the interface bore provided between the cylinder head and the assembly.
In another embodiment, the O-ring is of elastomer.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
A fuel injection assembly, of the present disclosure, for an internal combustion engine will now be described with the help of the accompanying drawing, in which:
Figure 1 illustrates an isometric view of a conventional mounting arrangement of a fuel injection pump mounted on the engine;
Figure 2 illustrates an exploded view of the fuel injection pump assembly in accordance with an embodiment of the present disclosure; and
Figure 3 illustrates an isometric view of the fuel injection pump assembly of Figure 2.
LIST OF REFERENCE NUMERALS
100 – Fuel injection pump
102 – Crank case
200 – Fuel injection pump assembly
202 – Internal combustion engine
204 – Fuel injection pump
206 – Cylinder head
208 – Pump shaft
209 – Housing
210 – First gear
212 – Second gear
214 – Nut
216 – Fastener
218 – Mounting holes
DETAILED DESCRIPTION
Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details, are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms “comprises,” “comprising,” and “including,” are open ended transitional phrases and therefore specify the presence of stated features, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.
When an element is referred to as being “mounted on,” “engaged to,” “connected to,” or “coupled to” another element, it may be directly on, engaged, connected or coupled to the other element.
The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region, layer or section from another component, region, layer or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
Terms such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used in the present disclosure to describe relationships between different elements as depicted from the figures.
Figure 1 illustrates an isometric view of a conventional mounting arrangement of a fuel injection pump (100) on the internal combustion engine (not specifically labelled in figures). The crankcase (102) of the engine of the vehicle is provided with a bore to accommodate the pump (100) therein. As a result, the packing of the pump (100) is complex and the synchronization of the pump (100) with engine is difficult. Consequently, the accessibility to the pump (100) is reduced, which in turn requires dismantling the engine in case of serviceability or failure of the fuel pump (100).
A preferred embodiment of a fuel injection assembly (200), of the present disclosure, for an internal combustion engine (202) will now be described in detail with reference to Figure 1 through Figure 3.
The fuel injection pump assembly (200) (hereinafter referred to as ‘the assembly 200’) comprises a fuel injection pump (204), mounting means and coupling means. The fuel injection pump (204) configured to supply fuel to the engine (202) at a predetermined rate and pressure. The mounting means is configured to mount the pump (204) on the cylinder head (206) of the engine (202). The coupling means couples the pump shaft (208) of the pump (204) to the camshaft (not specifically shown in figures) of the engine (202) for driving the pump (204).
In an embodiment, the mounting means includes a housing (209) provided to contain the fuel injection pump (204) therein.
Mounting the assembly (200) on the cylinder head facilitates ease in synchronization of the pump (204) with the camshaft of the engine (202).
In an embodiment, the coupling means includes a gear mechanism configured to couple the camshaft to the pump shaft (208). The gear mechanism includes a first gear (210) and a second gear (212). The first gear (210) is mounted on the camshaft. The second gear (212) is mounted on the pump shaft (208), and is engaged with the first gear (210) to transmit power from the camshaft to the pump shaft (208). The second gear (212) is mounted on the pump shaft (208) by means of a nut (214) to facilitate transmission of power from the camshaft to the pump shaft (208).
Mounting holes (218) are configured on the cylinder head (206) to allow the fastening of the pump shaft (208) to the pump (204) by means of fasteners (216).
The assembly (200) includes an O-ring (not specifically shown in figures) to seal the interface bore provided between the cylinder head (206) and the assembly (200), and prevent leakage of oil therefrom.
In an embodiment, the O-ring is of elastomer which includes nitrile, neoprene, silicone, ethylene propylene, polytetrafluoroethylene (PTFE), and polyurethane.
The assembly (200) of the present disclosure improves backlash free contact between the first gear (210) and the second gear (212). Additionally, the chances of losses in fuel injection pressure decreases. Further, the assembly (200) ensures easy access to the pump (204) without dismantling the engine (202) in case of replacement or maintenance. As a result, the breakdown time of the vehicle decreases.
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
TECHNICAL ADVANCEMENTS
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of a fuel injection pump assembly for an internal combustion engine, that:
• provides easy accessibility to the fuel injection pump; and
• easily synchronized with a camshaft of the engine.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments 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.
The foregoing description of the specific embodiments 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.
Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.