DESC:FIELD
The present disclosure relates generally to the field of drive systems for fuel injection pumps and vacuum pumps for brake booster application. In particular, the present disclosure relates to compaction of the layout of the driving arrangement of a fuel injection pump for an internal combustion engine and a vacuum pump for brake booster application.
DEFINITION
As used in the present disclosure, the following terms are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used indicates otherwise.
Vacuum Pump: The term "Vacuum Pump" hereinafter refers to, but is not limited to, a device that removes gas molecules from a confined space in order to leave a partial vacuum or desired negative pressure. The vacuum pump helps in maintaining a sufficient vacuum to the brake booster or other accessories.
Fuel Injection Pump: The term "Fuel Injection Pump" hereinafter refers to, but is not limited to, a mechanical device that compresses the fuel by means of plunger/ piston and supplies or pumps the fuel at high-pressure from the fuel tank to common rail.
Camshaft: The term "Camshaft" hereinafter refers to, a camshaft of a fuel injection pump which converts rotational motion to any desired motion type. The camshafts are generally used in internal combustion engine to actuate intake and exhaust valves and to mechanically control the ignition system.
These definitions are in addition to those expressed in the art.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
The continuous advancement in engine technology increases the demand for in-cylinder direct-injection technology. However, the direct injection of fuel in the firing chamber can harsh the environment and also, direct injection of fuel utilizes a high-pressure oil pump to be assembled. Further, to meet the demand for vehicle load braking, the power from the vacuum servo system must be supplied with the aid of a vacuum pump, and therefore, the vacuum pump must also be installed with the drive member.
The assembly of the high-pressure fuel injection pump and the drive member for the vacuum pump is difficult in a confined space, and due to the requirement of the extra drive member for the vacuum pump, the overall size of the entire transmission system becomes bulky which in-turns alter the performance of the engine.
Further, during the conventional design of the transmission system, the high-pressure fuel injection pump and the vacuum pump along with the drive member are used to be arranged in series with the camshaft which in-turn oversize the resulting assembly. And also, due to the series arrangement between different components, the system behaves like a cantilever beam with varying load acting at different sections. This can easily lead to deformation as well as wear and tear between the camshaft and the bearing and thus impair the service life of the camshaft.
Furthermore, in the conventional design, the camshaft is only used to drive the fuel injection pump, while the vacuum pump is driven by the alternator.
However, the conventional design fails to suggest the removal of the vacuum pump from the alternator, nor does eliminate the requirement of vacuum oil inlet, outlet hose, and pipe connections, which results in making the system becoming more bulky, oversized, and tends to increase the assembly time of different in-line components which in-turn increases the costs too.
There is, therefore, felt a need for an arrangement that eliminates the aforementioned drawbacks.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
It is an object of the present disclosure to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
An object of the present disclosure is to provide an arrangement for removing the drive of the vacuum pump from the alternator.
Another object of the present disclosure is to provide a simplified arrangement for the elimination of a vacuum oil inlet, an outlet hose, and other pipe connections.
An object of the present disclosure is to provide an arrangement for compaction of the fuel injection system boundary layout including a vacuum pump.
Still another object of the present disclosure is to provide an arrangement for eliminating leakages from additional pipes by deleting the parts.
Yet another object of the present disclosure is to provide an arrangement that reduces cost, weight, friction and assembly time.
Still another object of the present disclosure is to provide an arrangement to eliminate the series connection which can reduce the deformation/ distortion due to their weight.
Yet another object of the present disclosure is to provide an arrangement which can provide simultaneous movement to fuel injection pump and vacuum pump.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure envisages an integrated drive arrangement for a vacuum pump and a fuel injection pump. The integrated drive arrangement comprises a driveshaft that is configured to receive power and transmit the received power for driving the fuel injection pump and the vacuum pump.
The integrated drive arrangement comprises a gear, a cam and a vacuum pump engagement portion. The gear is mounted on the driveshaft. The gear is configured to receive power and to transmit the received power to the driveshaft. The cam is mounted on the driveshaft and is configured to engage with a reciprocating element of the fuel injection pump to enable operation of the fuel injection pump due to rotation of the driveshaft. The vacuum pump engagement portion is formed on the driveshaft. The vacuum pump engagement portion is configured to engage with a rotating element of the vacuum pump to enable operation of the vacuum pump due to rotation of the driveshaft.
A sprocket can be used in place of the gear with appropriate modifications, in an alternative embodiment.
In a preferred embodiment, the integrated drive arrangement includes a cambox. The cambox is configured to encapsulate the cam. The cambox is composed of internal oil galleries for facilitating hydraulic flow across the vacuum pump.
In an embodiment, the integrated drive arrangement comprises a backplate. The backplate is configured to form an interface between the cambox and the housing of the vacuum pump. The backplate is composed of internal oil galleries in fluid communication with the internal oil galleries of the cambox.
In a preferred embodiment, the gear is mounted at a first end of the driveshaft. The vacuum pump engagement portion is formed as a second end of the driveshaft.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWING
An integrated drive arrangement for a fuel injection pump and a vacuum pump of the present disclosure will now be described with the help of the accompanying drawing, in which:
Figure 1 shows an isometric view of the integrated drive arrangement of the present disclosure with a fuel injection pump and a vacuum pump;
Figure 2 shows an exploded view of the integrated drive arrangement of Figure 1;
Figure 3 shows an isometric view of a driveshaft of the present disclosure; and
Figure 4 shows a sectional view of the integrated drive arrangement of Figure 1.
LIST OF REFERENCE NUMERALS USED IN DETAILED DESCRIPTION AND DRAWING
10 – Fuel injection pump
20 – Vacuum pump
100 – Integrated drive arrangement
105 – Gear
112 – Tappet
120 – Cam
125 – Cambox
130 – Backplate
140 – Oil galleries
150 – Driveshaft
152 – First end of driveshaft
155 – Second end of driveshaft
DETAILED DESCRIPTION
Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
Embodiments are provided 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 to explain 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”, “including” and “having” are open-ended transitional phrases and therefore specify the presence of stated features, elements, units, and/or components, but do not forbid the presence or addition of one or more other features, elements or components thereof.
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. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed elements.
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.
In one of the conventional designs of a fuel injection system, the high-pressure fuel injection pump and a vacuum pump along with a drive member are used to be arranged in series with the camshaft which in-turn oversize the resulting transmission assembly. And also, due to the series arrangement between different components, the system behaves like a cantilever beam with varying load acting at different sections. This can easily lead to deformation as well as wear and tear between the camshaft and the bearing and thus may impair the service life of the camshaft.
Furthermore, in the conventional design, the camshaft is only used to drive the fuel injection pump, while the vacuum pump is driven by the alternator.
However, the conventional design fails to suggest the removal of the drive of the vacuum pump from the alternator, nor does eliminate the requirement of the vacuum oil inlet, outlet hose, and pipe connections, which results in making the system becoming more bulky, oversized, and tends to increase the assembly time of different in-line components which in-turn increases the costs too. Hence, there is a system that is more compact, cost-efficient, robust, and easy to assemble, and which also eliminates the aforementioned drawbacks of the discussed conventional system.
The preferred embodiment of the present invention will now be described with reference to Figure 1-4.
The present disclosure envisages an integrated drive arrangement 100 for a fuel injection pump 10 and a vacuum pump 20. The integrated drive arrangement 100 comprises a driveshaft 150 that is configured to receive power and transmit the received power for driving the fuel injection pump 10 and the vacuum pump 20.
The integrated drive arrangement 100 comprises a gear 105, a cam 120 and a vacuum pump engagement portion 155. The gear 105 is mounted on the driveshaft 150. The gear 105 is configured to receive power, typically from the crankshaft of the engine, and transmit the received power to the driveshaft 150. The cam 120 is mounted on the driveshaft 150 and is configured to engage with a reciprocating element of the fuel injection pump 10 to enable operation of the fuel injection pump 10 due to rotation of the driveshaft 150. The vacuum pump engagement portion 155 is formed on the driveshaft 150. The vacuum pump engagement portion 155 is configured to engage with a rotating element of the vacuum pump 20 to enable operation of the vacuum pump 20 due to rotation of the driveshaft 150.
A sprocket can be used in place of the gear 105 with appropriate modifications, in an alternative embodiment.
In a preferred embodiment, the integrated drive arrangement 100 includes a cambox 125. The cambox 125 is configured to encapsulate the cam 120. The cambox 125 is composed of internal oil galleries for facilitating hydraulic flow across the vacuum pump 20.
In an embodiment, the integrated drive arrangement 100 comprises a backplate 130. The backplate 130 is configured to form an interface between the cambox 125 and the housing of the vacuum pump 20. The backplate is composed of internal oil galleries 140 in fluid communication with the internal oil galleries of the cambox 125.
In a preferred embodiment as illustrated in Figures 1-4, the gear 105 is mounted at a first end 152 of the driveshaft 150. The vacuum pump engagement portion 155 is formed as a second end 155 of the driveshaft 150.
In an embodiment, the fuel injection pump 10 comprises a vertically movable plunger or piston that is in operative contact with a tappet 112 and the operative lower end of the tappet 112 is in rolling contact with the cam 120. The vertical movable plunger cyclically moves up and down with the rotation of cam 120 due to rotation of the driveshaft 150, and thereby, the volume inside the fuel injection chamber 110 gradually increases and decreases during a cycle. The fuel injection pump 10 is driven so that the pressurized fuel is supplied to the fuel line by the driving force of the cam 120, which is further transmitted to a common rail.
As per the embodiment under ongoing discussion, the cam 120 is assembled in the housing wherein a bearing supports the driveshaft 150, and the backplate 130 acts as a fixture for mounting the cambox 125 with the vacuum pump 20 and also acts as thrust surface for the cam 120. The type of bearing can be selected from a class of hydrodynamic bearings.
In an advantageous embodiment, the gear 105 that is mounted at the first end 152 of the driveshaft 150 can be replaced with a plurality of gears, depending upon the desired speed reduction ratio required or to obtain variation in firing order in the case of a plurality of cylinder or to vary the fluid flow rate.
The driveshaft 150 passes through the cambox 125 and connects the vacuum pump 20. Thus, the cambox 125 not only acts as structural support for the fuel injection pump 10 but also provides a compact network of hydraulic galleries that eliminates need of hoses, pipes and the like. A significant reduction in weight and cost is achieved. Reduction in friction is provided due to a distributed support for the vacuum pump as compared to the cantilever support in prior art. Due to the driveshaft 150 of the present disclosure, compaction and reduction in assembly and service time is realized.
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 ADVANCES AND ECONOMICAL SIGNIFICANCE
The present disclosure described hereinabove has several technical advantages including, but not limited to, the realization of an integrated drive arrangement for a fuel injection pump and a vacuum pump, that:
• removes drive of the vacuum pump from the alternator;
• eliminates vacuum oil inlet, outlet hose, and pipe connections;
• eliminates leakages from additional pipes by removing movable parts;
• reduces cost, weight, friction;
• reduces the chances of distortion or deformation of the driveshaft;
• makes the transmission system compact;
• comparatively improves service life;
• minimizes the assembly time due to the reduction in the number of movable parts.
The foregoing disclosure has been described with reference to the accompanying embodiments which do not limit the scope and ambit of the disclosure. The description provided is purely by way of example and illustration.
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 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.
The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
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.
,CLAIMS:WE CLAIM:
1. An integrated drive arrangement (100) for a fuel injection pump (10) and a vacuum pump (20), said integrated drive arrangement (100) comprising a driveshaft (150) configured to receive power and transmit said received power for driving said vacuum pump (20) and said fuel injection pump (10).
2. The integrated drive arrangement (100) as claimed in claim 1 comprising:
• A gear (105) mounted on the drive shaft (150), said gear (105) configured to receive power and transmit said received power to said driveshaft (150);
• A cam (120) mounted on said driveshaft (150), said cam (120) configured to engage with a reciprocating element of said fuel injection pump (10) to enable operation of said fuel injection pump (10) due to rotation of said driveshaft (150); and
• A vacuum pump engagement portion (155) formed on said driveshaft (150), said vacuum pump engagement portion (155) configured to engage with a rotating element of said vacuum pump (20) to enable operation of said vacuum pump (20) due to rotation of said driveshaft (150).
3. The integrated drive arrangement (100) as claimed in claim 1 or claim 2, wherein said integrated drive arrangement (100) includes a cambox (125), said cambox (125) configured to encapsulate said cam (120), said cambox (125) composed of internal oil galleries for facilitating hydraulic flow across said vacuum pump (20).
4. The integrated drive arrangement (100) as claimed in claim 3, wherein said integrated drive arrangement (100) comprises a backplate (130), said backplate (130) configured to form an interface between said cambox (125) and the housing of said vacuum pump (20), said backplate composed of internal oil galleries in fluid communication with the internal oil galleries of said cambox (125).
5. The arrangement (100) as claimed according to claim 2, wherein said gear (105) is mounted at a first end (152) of said driveshaft (150).
6. The arrangement (100) as claimed according to claim 2, wherein said vacuum pump engagement portion (155) is formed as a second end (155) of said driveshaft (150).