[go: up one dir, main page]

WO2022208526A1 - Moteur à combustion interne - Google Patents

Moteur à combustion interne Download PDF

Info

Publication number
WO2022208526A1
WO2022208526A1 PCT/IN2022/050238 IN2022050238W WO2022208526A1 WO 2022208526 A1 WO2022208526 A1 WO 2022208526A1 IN 2022050238 W IN2022050238 W IN 2022050238W WO 2022208526 A1 WO2022208526 A1 WO 2022208526A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
gas port
land
piston assembly
piston ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IN2022/050238
Other languages
English (en)
Inventor
Joseph Sumith
Umate MOHAN D
Johnson JAYAJOTHI
Krishnan SIVA RAMA
Ranjan Das BISWA
Vutukuri CHAKRADHAR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TVS Motor Co Ltd
Original Assignee
TVS Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TVS Motor Co Ltd filed Critical TVS Motor Co Ltd
Publication of WO2022208526A1 publication Critical patent/WO2022208526A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/09—Pistons; Trunk pistons; Plungers with means for guiding fluids
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F5/00—Piston rings, e.g. associated with piston crown

Definitions

  • the present subject matter relates to an internal combustion engine. More particularly, the present subject matter relates to a piston assembly of the internal combustion engine.
  • a piston, of a piston assembly is a component of reciprocating engines, reciprocating pumps, gas compressors etc.
  • Pistons are usually equipped with one or more piston rings. These are circular metal rings that fit into grooves in piston walls and assure a snug fit of the piston inside a cylinder block. They provide a seal to prevent leakage of compressed gases around the piston and to prevent lubricating oil from entering the combustion chamber.
  • Fig.l is an exploded view of piston assembly as per one embodiment of the present invention.
  • Fig.la is an assembled view of piston assembly as per one embodiment of the present invention.
  • Fig.lb is a sectional view of piston assembly with one or more gas port as per one embodiment of the present invention.
  • Fig.lc is a zoom view of top land of piston assembly as per one embodiment of the present invention.
  • Fig.ld is a zoom view of top land of piston assembly with first piston ring groove as per one embodiment of the present invention
  • Fig.2 is a sectional view of piston assembly with one or more gas port on second land as per another embodiment of the present invention.
  • Fig.2a is a zoom view of second land of piston assembly with second piston ring groove as per one embodiment of the present invention
  • Fig.3 is a sectional view of the piston assembly with one or more gas port on the top land and second land as per another embodiment of the present invention.
  • Fig. 4 is a graphical representation as per embodiment of the present invention.
  • a piston assembly is a primary component of a power unit e.g. an internal combustion engine.
  • the main function of the piston assembly is to transform the pressure generated by burning air-fuel mixture into force, acting on a crankshaft through reciprocatory motion.
  • the piston assembly also performs secondary functions like ensuring sealing of combustion chamber, preventing gas leakages from it and oil penetration into combustion chamber.
  • the shape of the piston of the piston assembly depends mainly on type of combustion engine.
  • Gasoline (petrol) engine pistons tend to be lighter and shorter compared with the diesel engine pistons.
  • the piston is connected to a connecting rod through a piston pin.
  • the pin is kept in place in the piston by a pin retaining clip.
  • a piston crown is an upper part of the piston assembly.
  • Piston assembly has three ring grooves, in which one or more piston rings are mounted.
  • the top ring is called a compression ring
  • the middle one is a scraper ring
  • the bottom one is an oil control ring.
  • the compression ring needs to seal the combustion chamber in order to prevent the inside gases from escaping into a cylinder block.
  • the oil control ring scraps the oil from a cylinder wall, when the piston is on a power or exhaust stroke.
  • the middle ring has a combined role of assuring compression in the cylinder and scrapping excess oil from the cylinder walls. Further, the piston assembly takes up the pressure exerted by combustion gases and coverts it into a reciprocating motion inside the cylinder block.
  • a piston skirt keeps the piston balanced inside the cylinder. It is usually covered with a low friction material to reduce the friction losses.
  • the main parameter in the one or more piston ring (referred as piston ring) of the piston assembly that affects sealing of the combustion gases is a radial outward normal force exerted by the piston ring against the block. This force is called as piston ring tangential load.
  • the piston ring seals the combustion chamber through inherent and applied pressure. Inherent pressure is the internal spring force that expands the one or more piston ring based on the design and properties of the material used and the tangential load is achieved by the inherent pressure of the one or more piston ring.
  • an engine with piston and a non-contact bearing between the piston and a cylinder is disclosed.
  • the non-contact bearing is included in a clearance gap between the piston and a bore.
  • a bearing fluid is supplied to the clearance gap through the piston and/or the cylinder.
  • piston with vertical and horizontal gas ports is disclosed to reduce tangential load.
  • this configuration has its own disadvantage that the vertical gas port is prone to carbon clogging in passage of the port and the horizontal gas ports leads to poor sealing due to problem of accessibility of combustion gases to backside of pistons rings.
  • the present invention provides a solution to the above problems while meeting the requirements of minimum modifications in the utility box of the vehicle.
  • the present invention discloses a piston assembly and more particularly an improved piston assembly having one or more gas port which reduces the tangential load and improves sealing of the combustion gases.
  • a piston assembly comprising one or more piston rings, a crown/head portion, piston skirt, piston pin, gas ports etc.
  • the head portion comes into contact with combustion gases.
  • the gas ports having, a predetermined diameter, are disposed angularly/inclinedly on top land of piston assembly with respect to piston assembly mid plane axis.
  • the holes are formed between a predetermined range of width of the top land from face of the head portion of the piston. This configuration ensures improved sealing between the piston rings and block, since the combustion gases exert a net downward and outward pushing force on backside of the piston rings with decreased tangential load which pushes the piston rings against the block.
  • this configuration provides sufficient radial pressure to be exerted between the block and the pistons rings which decreases the need of fixed tangential load continuously in the piston assembly.
  • This configuration decreases the FMEP (friction mean effective pressure) loss, emission and increases fuel economy in the vehicle.
  • This configuration also enhances durability of the piston rings. More precisely, this configuration provides variable tangential load that is the tangential force gradually increases from lower RPM to higher RPM of engine (engine operating parameter), as per the requirement, thereby reducing frictional loss.
  • front and rear and “left” and “right” referred to in the ensuing description of the illustrated embodiment refer to front and rear, and left and right directions as seen in a state of being seated on a seat of the vehicle and looking forward.
  • Fig. 1 is an exploded view of a piston assembly as per one embodiment of the present invention.
  • the piston assembly includes head portion a piston (105) having a head portion (107), a piston pin (106), a pair of attachment means (104a, 104b), one or more piston ring (101, 102, and 103).
  • the one or more piston ring restricts the combustion gas from channelizing into a crankcase of an engine.
  • the piston pin (106) connects the piston to a connecting rod (not shown) and provides a bearing for the connecting rod to pivot upon as per the movement of the piston. Further, the connecting rod converts reciprocating motion of the piston into rotation of a crankshaft (not shown).
  • the crankshaft includes a rectangular pocket.
  • Fig. la is an assembled view of a piston assembly as per one embodiment.
  • the piston assembly further includes a top land (109), a second land (111), a third land (113), a first piston ring groove (108), a second piston ring groove (112), where the one or more groove is axially spaced with each other, a piston skirt (114) and one or more gas port (110).
  • the one or more ring groove is configured to receive one or more piston ring in the piston assembly.
  • the top land (109 ) is formed between the head portion (101) and second land (111 ).
  • the third land (113 ) is an oil control ring which scraps the oil from a cylinder wall, when the piston assembly is on a power or exhaust stroke.
  • one or more gas port (110) (as shown in fig. la) is disposed on the top land (109 ) of the piston assembly (100) and is angularly disposed along the circumference of the top land 109 equidistance from each other.
  • the one or more ring is disposed between the piston skirt and the head portion of the piston assembly.
  • Fig. lb is a sectional view of the piston (105) as per one embodiment of the present invention.
  • the one or more gas port is angularly/inclinedly disposed circumferentially on the top land at a predetermined angle A, where predetermined angle A is in range of 10-80 degree with respect to mid plane sliding axis (YY’) of the piston assembly (100). More than 80 degree and less than degree leads to clogging of one or more gas port (100) with carbon, thus affecting efficiency of the one or more gas port.
  • the one or more gas port (110) is formed with a diameter D1 in predetermined range of 0.5mm to 2mm to channelize combustion gas inside the piston ring grooves.
  • the one or more gas port (110) includes two ends where one end (110a) is in communication with a crevice volume (V) (as shown in fig. lc) formed between the piston assembly (100) and a wall of cylinder block (shown with dotted line) and another end (110b) is in communication with first piston ring groove (108), thus, ensuring channelizing of combustion gases into one or more rings of the piston assembly.
  • V crevice volume
  • the another end (110b) of the one or more gas port (110) is disposed at a predetermined radial distance X’ from an inner diameter of the first piston ring groove (108) (as shown in fig. Id), where X’ is a radial distance of a diameter of the top land (109) from the another end (110b) of the one or more gas port (110), configured on the first piston ring groove (108) of said one or more groove (108, 112).
  • the predetermined distance X’ is in range of 5-80% of X in a radially outward direction, where X is a distance of the top land diameter from an inner surface of the first piston ring groove.
  • the one end (110a) of one or more gas port (110) is disposed at a predetermined distance B with respect to height (H) of the top land from top surface of the first piston ring groove (108).
  • the predetermined distance B is in the range of 10-90% of H. More than 90% and less than 10% impacts the efficiency of the one or more gas port (110) as disposed in the piston assembly.
  • combustion gases from combustion chamber enters backside of one or more piston rings (101, 102, and 103) (as shown in fig. 1), through one or more inclinedly disposed gas port (110) and pushes the rings against the block (shown with dotted line), thereby, exerting a radial force between the one or more piston rings and the block.
  • this configuration decreases the requirement of fixed/high tangential load of the one or more piston ring.
  • An inertia disc is disposed at right side of magneto rotor, left side of LH crankshaft web and at centre of stem of the LH crankshaft to reduce ideal rpm of the engine, thus ensuring reduction of vibration due to power stroke.
  • the piston skirt (114) is provided with one or more grooves disposed circumferentially along length of the piston skirt.
  • the one or more grooves are provided with depth to hold the oil for lubricating components to reduce the friction between the components.
  • the combustion gases exert a net downward and outward pushing force on backside of the one or more piston ring with reduced tangential force.
  • the gases channelizes through the one or more inclinedly disposed gas port pushes the one or more ring against the block, thus, ensuring improved sealing of the gases while reducing the friction between the one or more rings and the block resulting in less blowby losses (as shown in fig. 4).
  • this configuration ensures improved sealing with reduced tangential load, thus reducing friction by reducing requirement of the generation of inherent pressure through expansion of one or more piston ring.
  • Fig. 2 is a sectional view of piston assembly with one or more gas port as per another embodiment of the present invention.
  • the one or more gas port is angularly/inclinedly disposed circumferentially on the second land at a predetermined angle A, where predetermined angle A is in range of 10-80 degree with respect to mid plane sliding axis (YY’) of the piston assembly (100). More than 80 degree and less than degree leads to clogging of one or more gas port (100) with carbon, which affects efficiency of the one or more gas port.
  • the one or more gas port (110) is formed with a diameter D2 in predetermined range of 0.5mm to 2mm to channelize combustion gas inside the piston ring grooves.
  • the one or more gas port (110) includes two ends where one end (110a) is in communication with a crevice volume (V) (as shown in fig. lc) formed between the piston assembly (100) and a wall of cylinder block (shown with dotted line) and another end (110b) is communication with second piston ring groove (108), thus, ensuring channelizing of combustion gases into one or more rings of the piston assembly.
  • V crevice volume
  • the another end (110b) of one or more gas port (110) is disposed at a predetermined distance X’ from an inner diameter of the second piston ring groove (112) (as shown in fig. 2a), where X’ is a radial distance of a diameter of the second land (111) from the another end (110b) of the one or more gas port (110), configured on the second piston ring groove (112) of said one or more groove (108, 112).
  • the predetermined distance X’ is in range of 5-80% of X, where X distance of the second land diameter from an inner surface of second piston ring groove.
  • the one end (110a) of the one or more gas port (110) is disposed at a predetermined distance B with respect to height (H) of the second land from top surface of the second piston ring groove (108).
  • the predetermined distance B is in the range of 10-90% of H. More than 90% and less than 10% impacts the efficiency of the one or more gas port (110) as disposed in the piston assembly.
  • Fig. 3 is a sectional view of piston assembly with one or more gas port as per another embodiment of the present invention.
  • the one or more gas port is formed on top land surface and a second land surface for channelizing combustion gas into the one or more piston ring.
  • This configuration improves sealing of the combustion gases in the one or more piston ring with reduced tangential load as the combustion gases are directly channelize to the one or more piston ring through the one or more gas port in the piston assembly to regular the thrust force exerted by the piston ring thereby controlling the sealing tangential force depending on the engine speed which results in reduced friction also and related loss also.
  • This configuration also improves sealing of the gases in the one or more piston ring groove without undesirably increasing the tangential load of the one or more piston rings
  • the invention helps in overcoming the problem of increased friction between the piston assembly and the block. It also ensures improved sealing of the combustion gas from going into the crankcase while reducing friction between the components in a controlled manner.
  • the embodiments of the present invention describes the potential modifications in the configuration of the one or more gas ports in the piston assembly.
  • Piston Assembly 107 Head portion 105: Piston
  • 104a, 104b A pair of attachment means 101, 102, 103: One or more piston ring
  • Fig. Id X’ : Distance of another end of the one or more gas port

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

La présente invention concerne un ensemble piston (100) pour un moteur à combustion interne. L'ensemble piston comprend un ou plusieurs orifices de gaz (110) disposés de manière inclinée par rapport à l'axe de coulissement de plan médian de l'ensemble piston (100), assurant une charge tangentielle réduite pour sceller le gaz de combustion et réduire ainsi le frottement.
PCT/IN2022/050238 2021-03-31 2022-03-15 Moteur à combustion interne Ceased WO2022208526A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202141015357 2021-03-31
IN202141015357 2021-03-31

Publications (1)

Publication Number Publication Date
WO2022208526A1 true WO2022208526A1 (fr) 2022-10-06

Family

ID=81327314

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2022/050238 Ceased WO2022208526A1 (fr) 2021-03-31 2022-03-15 Moteur à combustion interne

Country Status (1)

Country Link
WO (1) WO2022208526A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010075207A1 (fr) * 2008-12-22 2010-07-01 Caterpillar Inc. Ensemble piston pourvu d'un passage s'étendant jusqu'à la seconde gorge de segment
EP2639438A1 (fr) * 2012-03-13 2013-09-18 Wärtsilä Schweiz AG Piston et dispositif de distribution de lubrifiant pour moteur à combustion à piston alternatif
DE102014214673B3 (de) * 2014-07-25 2016-01-21 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
WO2019074620A1 (fr) * 2017-10-13 2019-04-18 Cummins Inc. Piston comprenant des canaux d'égalisation de pression de rainure pour empêcher l'affaissement radial d'anneaux de compression

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010075207A1 (fr) * 2008-12-22 2010-07-01 Caterpillar Inc. Ensemble piston pourvu d'un passage s'étendant jusqu'à la seconde gorge de segment
EP2639438A1 (fr) * 2012-03-13 2013-09-18 Wärtsilä Schweiz AG Piston et dispositif de distribution de lubrifiant pour moteur à combustion à piston alternatif
DE102014214673B3 (de) * 2014-07-25 2016-01-21 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor
WO2019074620A1 (fr) * 2017-10-13 2019-04-18 Cummins Inc. Piston comprenant des canaux d'égalisation de pression de rainure pour empêcher l'affaissement radial d'anneaux de compression

Similar Documents

Publication Publication Date Title
US5737999A (en) Blowby pressure control above an oil control ring in a reciprocating internal combustion engine
US20130228150A1 (en) Rotary, Internal Combustion Engine
US8555849B2 (en) Pistons for internal combustion engines
JP6389865B2 (ja) 内燃機関用ピストン
US4230027A (en) Reciprocating piston
WO2022208526A1 (fr) Moteur à combustion interne
US5261362A (en) Piston assembly having multiple piece compression ring
KR100976868B1 (ko) 왕복운동 엔진
US7246552B2 (en) Piston having asymmetrical pin bore slot placement
US5743171A (en) Oil control ring and groove arrangement for improved blowby control
EP4450795B1 (fr) Segment de piston
WO2010075207A1 (fr) Ensemble piston pourvu d'un passage s'étendant jusqu'à la seconde gorge de segment
US20250012230A1 (en) Piston, crank drive and reciprocating internal combustion engine
JP4661831B2 (ja) ピストン及び内燃機関
JP4133200B2 (ja) 往復動エンジン
CN112443394B (zh) 用于机动车辆内燃机的活塞组件
KR100398220B1 (ko) 피스톤링 회전 방지구조
US7188841B1 (en) Secondary piston seal
US6283070B1 (en) Apparatus and method for sealing internal combustion engines
RU2022146C1 (ru) Поршневое уплотнение для двигателя внутреннего сгорания
RU2411387C2 (ru) Поршневой двигатель
RU2651694C1 (ru) Цилиндропоршневая группа двигателя внутреннего сгорания
CN113685286A (zh) 内燃机用活塞环
JPS5853186B2 (ja) 内燃機関のピストン
FI128417B (en) Cylinder liner with slots

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22717451

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22717451

Country of ref document: EP

Kind code of ref document: A1