Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F3/00—Pistons 
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
  • F16F15/283—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same for engine crankshafts

Definitions

• the present subject matter generally relates to an internal combustion engine. More particularly but not exclusively, the present subject matter relates to a reciprocating assembly for the internal combustion engine.
• a frame assembly extends rearward from a head tube.
• the frame assembly acts as a skeleton for the vehicle that supports the vehicle parts.
• a front portion of the frame assembly connects to a front wheel through one or more front suspension(s).
• the frame assembly extends rearward of the vehicle, where a rear wheel is connected to a frame assembly through one or more rear suspension(s).
• An internal combustion (IC) engine is mounted to the frame assembly of the vehicle.
• the IC engine is functionally connected to the rear wheel, which provides the forward motion to the vehicle.
• plurality of panels are mounted to the frame assembly of the vehicle that covers various vehicle components.
• the vehicle’s “fuel economy” is defined by a distance that the vehicle has travelled or the distance that it can travel using a particular amount of fuel.
• a vehicle’s internal combustion engine powers the vehicle to bring the laden weight of the vehicle into motion.
• a lower laden weight of the vehicle leads to a higher “fuel economy” compared to a vehicle with higher laden weight.
• the cost of fuel it is customer’s requirement that the “fuel economy” for a vehicle shall be as high as possible.
• friction between parts having relative motion with respect to each other such as gears and transmission components also contributes towards reduction in “fuel economy” of a vehicle.
• Figure 1 illustrates a cross section of an internal combustion engine.
• Figure 2 illustrates a cylinder block and reciprocating assembly of the internal combustion engine with prior art problem of piston coming out of cylinder snout and piston fouling with the crank web while the piston is at BDC.
• Figure 3 illustrates a modified crank web solving the problem of piston skirt fouling with the crank web while the piston is at BDC.
• Figure 4 illustrates a cylinder block and reciprocating assembly of the internal combustion engine with prior art problem of.
• Figure 5 illustrates a perspective view of the crank web interaction with the cylinder.
• An internal combustion engine comprises of a combustion chamber where combustion of fuel takes place.
• a connecting rod connects a piston and a crank web. The power generated in the combustion chamber is transmitted to the crank web through the connecting rod.
• One end of the connecting rod is connected to the piston using a gudgeon pin.
• the other end of the connecting rod is connected to the crank web through a crankshaft.
• the L/S ratios of the engine is kept less than 1.65 wherein L is length of the connecting rod and S is the stroke length.
• the engine is also provided with an offset crankshaft.
• an offset crankshaft when the crankshaft is rotated in a clockwise direction, a distance that the piston travels from the top of the stroke (piston at maximum travel) to the bottom of the stroke (piston at the bottom of its travel) is greater than the diameter of the crankshaft rotation.
• the angle through which the crankshaft moves during the downstroke is greater than 180°.
• the engine therefore has a longer time power stroke than exhaust stroke.
• ICE Internal Combustion Engine
• the fouling of the piston and the crank web is eliminated by providing relief in the piston skirt and the crank web along the profde of interference of piston skirt and the crank web.
• Figure 1 shows a typical single cylinder ICE with cross section by omitting many inside parts for clarity & brevity.
• a cylinder head 101, cylinder block 102, camshaft 103 is shown which is supported on said cylinder head 101.
• a lobe 103L on the camshaft 103 actuates a rocker arm 104.
• the rocker arm 104 includes a left side rocker arm 104A and a right-side rocker arm 104B.
• the left side rocker arm 104A and a right-side rocker arm 104B work in a similar function.
• the rocker arm 104 actuates an inlet tappet 105 and an exhaust tappet 106 to operate intake and exhaust valve respectively.
• a connecting rod 108 is connected to the piston through a connecting pin 107.
• the connecting rod 108 is connected to a crank web 110 through the crankshaft 109.
• the crank web 110 are two lobes carrying a pre determined weight to balance the engine during the reciprocating motion within the engine.
• FIG. 1 illustrates a local cut section view of an engine assembly as per a prior art. The illustration shows a cylinder block 102, connecting rod 108, crank web 110, cylinder 201 and piston skirt 202.
• FIG. 3 illustrates a local cut section view of an engine assembly as per the present invention with many parts omitted for clarity.
• the fouling of the piston skirt 202 and the crank web 110 explained above can be avoided by creating an interface relief space (303) through recess (301, 302) which is provided on the crank web & said relief is juxtaposed at the interface of the piston skirt 202 and the crank web 110.
• This relief space 303created at the interface between the piston skirt 202 and the crank web 110 can be provided in multiple embodiments.
• an additional pair of conjugate cut-out (501, 502) is created on the piston skirt as shown in Fig 5.
• the at least one pair of local relief space (303) through recesses (301, 302) provided between the piston skirt 202 and the crank web 110 interface & the at least one pair of conjugate recess (501, 502) on the piston skirt allows a condition of overlapped reciprocating motion of piston skirt 202 and the crank web relative to each other while eliminating any possibility of fouling. This enables achieving a L/S ratio ⁇ 1.65 thereby enabling a design of a compact ICE.
• the crank web relief 303 at the piston skirt 202 and the crank web 110 interface is formed by providing a recess in the crank web 110 along the rotating interface profde of the piston skirt 202 and the crank web 110.
• the rotating interface profile is a space where the piston skirt 202 and the crank web 110 would have rubbed against each other in case the interface relief of the crank web is not provided.
• the interface relief is provided with predetermined clearances to allow the free rotation of piston skirt 202 and the crank web 110 relative to each other.
• the piston skirt is provided with a cut-out of relief (501, 502) shown in Fig 5, which is juxtaposed with the corresponding at least one of the crank webs of the crankshaft assembly. Therefore, during power stroke movement, the relative rotation of the piston skirt 202 and the crank web 110 allows an overlapping of piston skirt 202 and the crank web 110 thereby enabling reduced length of connecting rod & design of a compact ICE with L/S ⁇ 1.65. Since reduced length of the connecting rod length is now achieved, the reciprocating mass of the engine is reduced.
• the relief between the piston skirt 202 and the crank web 110 is formed by providing a plurality of recess in the piston skirt 202 along the conjugatively rotating interface profile of the piston skirt 202 and the crank web 110.
• the rotating interface profile is a space where the piston skirt 202 and the crank web 110 would have rubbed against each other in case the relief is not provided.
• the relief space is provided with the predetermined clearances to allow free rotation of piston skirt 202 and the crank web 110 relative to each other.
• the relative rotation of the piston skirt 202 and the crank web 110 allows an overlapping of piston skirt 202 and the crank web 110.
• Figure 3 illustrates the relief space 303 provided in between the piston skirt 202 and the crank web 110.
• the cut-out mass at the top end of the crank web 110 to create the relief space 303 further helps in providing low inertia for the crank web 110 so as to enable easy return of the piston to top dead center after reaching the bottom dead center.
• Figure 4 shows a perspective view of the relief spaces provided in between the piston skirt 202 and the crank web 110 by providing a recess in the piston skirt 202.
• the crank web 110 comprises of a first lobe 503 and a second lobe 504 (shown in Figure 5).
• the first lobe 503 and the second lobe 504 are additional weights on crank web and crankshaft which aid in providing balance to the engine and reduce vibrations during the reciprocating motion of the connecting rod and the piston.
• Figure 5 illustrates the relief recesses (501, 502) provided in between the piston skirt 202 and the crank web 110 by providing a recess on the outer periphery of the piston skirt 202.
• This recess in the piston skirt 202 helps in avoiding the fouling of the piston skirt 202 and the crank web 110 without adversely altering the configuration of the crank web 110.
• the relative rotation of the piston skirt 202 and the crank web 110 allows an overlapping of piston skirt 202 and the crank web 110.
• the relief space (303) in between the piston skirt (202) and the crank web (110) is formed by providing at least one of the recesses (501, 502) on the piston skirt (202).
• the relief space (303) in between the piston skirt (202) and the crank web (110) is formed by providing at least one of the recesses (301, 302) on the crank web (110).
• the relief space (303) in between the piston skirt (202) and the crank web (110) is formed by providing at least one of the recesses on cylinder skirt (204) of cylinder (201).
• the relief space (303) is formed with a conjugate shape to accommodate the first lobe (503) and the second lobe (504) when the piston is at bottom dead center.
• the reciprocating motion of piston skirt (202) and the crank web (110) relative to each other is overlapped at least during a portion of one stroke cycle when observed through a crankshaft axis X.
• the relief space in between the piston skirt and the crank web is formed by providing at least one of the recesses (501, 502) on the piston skirt (202) and one of the recesses (301, 302) on the crank web (110) at a location left to the bottom dead center and at a location right to the bottom dead center when observed through a crankshaft axis X.
• the present invention provides a compact engine with L/S ratio less than 1.65 thereby reducing the overall weight the engine and the vehicle thereby aiding in increasing fuel efficiency of the vehicle.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Aviation & Aerospace Engineering (AREA)
• Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=75173408

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• 2021
  • 2021-03-02 WO PCT/IN2021/050194 patent/WO2021176466A1/en unknown
  • 2021-03-02 MX MX2022010839A patent/MX2022010839A/es unknown
  • 2021-03-02 EP EP21714023.5A patent/EP4115072A1/en active Pending
  • 2021-03-02 CN CN202180017752.7A patent/CN115190941A/zh active Pending
  • 2021-03-02 BR BR112022017611A patent/BR112022017611A2/pt unknown

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