Induction system for an internal combustion engine

Field of the Invention:

This invention relates to an "Induction system for an internal combustion engine" and more particularly for gas supply device for engine or an engine running with bi-fuel.

Background of the Invention:

Typically in the induction system of IC engines running on gaseous fuels or bi fuels consists of air filter, tube outlet of air filter which is connected to a mixer body. The gaseous fuel which enters the said mixer body thru' a regulator from the gas cylinder mixes with the filtered air and passes thru' a throttle body (only gaseous fuel) or thru 'a carburetor (for bi-fuel) and finally to the engine. In the conventional gaseous engine / bi fuel engine the gas mixer body assembled between throttle body / carburetor & air filter and a low pressure gas line connection to it from gas reducer kit are connected externally thru' joints by hose clips. These joints are prone to leakage while running and can lead to leakage into the system or to the atmosphere. This can cause performance deteoriation of the engine and also frequent replacement of joints in service. Hence the objective of the invention is to overcome the above problem associated with the conventional layout.

Summary of the Invention:

An object of the present invention to provide a mixture body integrated with tube outlet by providing a gas fuel nozzle for an internal combustion engine which runs on gaseous fuel./ bi fuel.

Further object of the present invention is to provide a induction system layout with minimum no. of joints to eliminate the possibility of leakage in the system thereby ensuring consistency in the performance of the engine.

Another object of the present invention is to reduce no. of parts thereby reducing the cost.

Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

Brief Description of the Drawings:

The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein

Figure 1 illustrates a three wheeled vehicle.

Figure 2 illustrates an induction system for an internal combustion engine in accordance with one embodiment of the present subject matter.

Figure 3 illustrates a tube outlet body with gas supply nozzle in accordance with one embodiment of the present subject matter.

Figure 4 illustrates a tube of gas supply nozzle in accordance with one embodiment of the present subject matter.

Detail Description of the Drawings:

The present invention now will be described more fully hereinafter with different embodiments. This invention may, however, be* embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather those embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the invention to those skilled in the art.

Referring to figure 1, a three wheeler passenger carrier is provided with a relatively small wheel diameter with that of motorcycles. A single wheel (101) in the front is placed ahead of a metallic cowl (102) which is located in the centre of the front view of the vehicle. The said three wheeler is controlled by a handle bar (103) placed behind the said front cowl (102). The front cowl (102) is further extended upwards and is provided with a large opening to fit a transparent glass (104) for driver's visibility. A floor board (105) is formed with a height just above the centre of the wheel but below the top surface of the wheel (101). The said floor board (105) extends from the bottom most portion of the. front cowl (102) to rear end of the passenger, seat cabin support structure. A partition wall or B pillar (106) is provided perpendicular to floor board (105), located in the mid way portion between passenger seat structure (107) and front cowl (102). The height of the partition wall (106) is nearly equal to the height of driver's seat (108) top surface. A driver seat (108) is provided between the said partition wall (106) and the front cowl (102) for the driver wherein the rear end of the seat nearer to partition wall (106). The passenger seat mounting structure attaches with extended body structure or cabin (109) of the three-wheeler to cover the remaining two wheels (110) on top and partially on sides and extends beyond rear end of the wheel substantially. The said extended body structure (109) is almost a cube extended longitudinally with bottom portion completely open. The extended structure or cabin (109) is a inverted 'IT shaped metallic sheet structure with open end of the inverted 'U' is joined with a step like structure joining two side walls to form a longitudinally extended cube. The sidewalls of the cabin (109) are provided with inverted 'IT shaped recess (111) to allow rear wheels (110) to swing according to the movement of the wheel at the bottom most position of the cabin (109). The rear side of the cabin (109) is provided with an opening to fit a door or lid. The passenger seat (107) is on the passenger seat support structure. A gap is formed between the passenger seat (107) and the partition wall or B pillar (106) to form a region to accommodate and support the passengers and luggage. A sheet (112) extends from the rear end of the vehicle to the top most end of the front cowl (102) to cover the vehicle at the top supported by tubular support structure.

The said sheet (112) is generally a soft top made preferably of a resin material.

The rear end portion of the floor board is attached with 'U' shaped brackets spaced apart within the overall width of the vehicle. A pair of link arms is pivotably attached to the brackets through independent bolts. The rear end of the link arm is provided with a mounting bracket to fit a shock absorber bottom end. The rear end of the link is attached with a cylindrical member parallel to the axis of the pivot bolt to fit bearings and oil seal on both link arms. The axis of the cylinder member nearly coincides with the axis of the 'U' shaped recess provided on the side wall. A wheel axle passes through the bearings fitted on the cylindrical member attached to link member (arm). Outer end of the axle is attached with a circular flange provided with bolts press fitted in a circular pitch equidistantly. A wheel is fitted on the flange fastened by nuts (the fitment of wheel is same on both left and right side). The inner end of the axle is attached with a coupling member.

The front cowl, the partition wall and the floorboard attached to a ladder shaped frame place below the floorboard.

According to the preferred embodiment of the present invention and referring to Figure 2, Figure 3 and Figure 4, the tube outlet body 203 has a gas supply nozzle 201 in the form of tube 202 with minute holes 202 a (shown in Figure 3) and is located perpendicular to the intake air path 204. The tube outlet 203 along with gas supply nozzle 201 is integrally moulded and constitutes the tube outlet body. The said tube 203 experiences the vacuum when the throttle body 205 slide opens. Further the gas supply nozzle 201 is connected to a gas regulator 206 so as draw the gas using the vacuum experienced in the intake air passage 204. The holes 202a is positioned properly in the air path increases the vacuum to the regulator 206. The gas is drawn and delivered through the tube holes 202a to the engine 207 thru' the throttle body 205.

The gas delivery by the said gas supply nozzle 201 is across the airflow path whereby it helps in uniform mixing of air and gas

The said gas supply nozzle 201 can be located anywhere in the post filter volume of the air cleaner 208 where the passage experience the engine 207 operating vacuum controlled by the throttle slide valve opening. The said gas supply nozzle 201 can be made into single tube or split design based on layout convenience.

The regulated 'vacuum created by throttle body 205 opening can vary the amount of gas fuel drawn to the induction through gas tube mix with air. The prepared air fuel mixture is fed to the engine 207 through throttle body 205 opening according to the varying engine demand.

The said gas supply nozzle's tube 202 size, hole size, number of holes, location of the tube 202 inside the tube outlet body 203 can be changed to varying engine demand to control the air fuel ratio.

The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the claims.

We Claim:

1. An induction system 200 for an internal combustion engine running on bi fuel comprises:
a gas supply nozzle 201 having a tube 202 provided with hole(s) 202a and is connected to gas regulator 206; and
an air intake path 204;
wherein the gas supply nozzle 201 is placed across the airflow path in air intake path 204 at tube outlet 203; and
wherein the tube 202 draws gas and delivers it through the holes 202a.

2. The induction system 200 as claimed in claim 1, wherein the said tube 202 is preferably a single piece.

3. The induction system 200 as claimed in claim 1, wherein the said tube 202 is preferably a split piece.

4. The induction system 200 as claimed in claim 1, wherein the said tube 202 is placed anywhere in the induction path including air cleaner 208 and carburettor or throttle body 205.

5. The induction system 200 as claimed in claim 1, wherein the said gas supply nozzle 201 controls the air fuel ratio in internal combustion gas engine 207.

6. An induction system 200 as substantially shown and described in the specification.