KR20090057574A - Cooling jet structure for piston - Google Patents

Cooling jet structure for piston Download PDF

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Publication number
KR20090057574A
KR20090057574A KR1020070124210A KR20070124210A KR20090057574A KR 20090057574 A KR20090057574 A KR 20090057574A KR 1020070124210 A KR1020070124210 A KR 1020070124210A KR 20070124210 A KR20070124210 A KR 20070124210A KR 20090057574 A KR20090057574 A KR 20090057574A
Authority
KR
South Korea
Prior art keywords
piston
oil
cooling jet
plunger
cooling
Prior art date
Application number
KR1020070124210A
Other languages
Korean (ko)
Inventor
이의성
Original Assignee
현대자동차주식회사
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 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020070124210A priority Critical patent/KR20090057574A/en
Publication of KR20090057574A publication Critical patent/KR20090057574A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/08—Cooling of piston exterior only, e.g. by jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/086—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating gudgeon pins
    • 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members

Abstract

A cooling jet structure for a piston is provided to cool a piston effectively by spraying oil onto a piston through a cooling jet and draining oil properly through the cooling jet in case oil pressure of a main gallery is over 3.6bar. A cooling jet structure for a piston comprises an intake port(11b) into which oil is fed; an exhaust port(11c) spraying oil onto a piston; a plunger(12) opening and closing the intake port and the exhaust port; a spring(13) elastically supporting the plunger; and a drain hole(11d) formed on the bottom of the drain port. The drain hole expels oil to the outside while opening and closing by the plunger.

Description

Cooling jet structure for piston cooling {Cooling jet structure for piston}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling jet for cooling a piston of an engine, and more particularly to a cooling jet structure for piston cooling in which a drain hole for draining oil of a predetermined pressure or more is integrally formed.

The piston of a conventional diesel engine has a higher temperature and a higher pressure than the piston of a gasoline engine, and if it is not properly cooled, the piston will squeeze. It will have a bad effect.

In order to properly cool the piston as described above, in the related art, oil is injected into the piston using a cooling jet to cool the piston through heat exchange between the oil and the piston.

1 shows a structure in which a cooling jet is installed in a cylinder block to cool the piston according to the prior art, that is, a cooling jet 2 protrudes toward the piston 3 in the lower part of the combustion chamber of the cylinder block 1. It is installed so that the oil sprayed from the cooling jet flows into the piston (3) and flows along the inner oil gallery formed in the piston, thereby cooling the piston through heat exchange with the piston and then draining it downward again. .

In FIG. 2, the configuration of the cooling jet is illustrated in detail in cross section, and the housing 2a is fixedly mounted to the lower portion of the cylinder block 1, and the plunger 2b is provided inside the housing 2a. 2c) is installed to be elastically supported, and the cap 2d is mounted on the lower portion of the housing 2a to be kept airtight, while one side of the housing 2a is provided with oil by the piston 3. The supply pipe 2e for supplying is connected.

Accordingly, when the engine is stopped or operated at a low speed, when no oil is supplied but the engine is 1,200 rpm or more and the main gallery pressure is 1.5 bar, the pressure of oil applied to the plunger is greater than the elastic force of the spring supporting the plunger. Oil is then sprayed into the piston through the feed pipe to cool the piston.

3 shows the state in which the oil is sprayed into the piston by the cooling jet, the engine is operated between 1,200rpm and 3,800rpm while the oil pressure of the main gallery is about 1.5bar to 3.8bar when the cooling jet (2 Oil (4) is properly sprayed into the oil gallery (3a) of the piston (3) through the end of the supply pipe (2e) of the) to cool the piston.

However, when the engine shown in FIG. 4 operates at about 4,000 rpm or more and the oil pressure of the main gallery reaches about 4.0 bar, the oil sprayed through the supply pipe 2e of the cooling jet spreads sideways due to the high pressure and the piston (3). ), The oil supply amount is insufficient, which causes the piston not to cool properly.

Accordingly, the present invention has been made in view of the above circumstances, and when the oil pressure supplied to the cooling jet is excessive, a predetermined amount of oil is drained to the outside through the cooling jet to the piston through the oil supply pipe of the cooling jet. It is an object of the present invention to provide a cooling jet structure for piston cooling, which ensures that the proper oil is always supplied so that the piston can be efficiently cooled.

The present invention for achieving the above object, the inlet port for receiving oil, the discharge port for spraying oil to the piston, the inlet port and the discharge port is a plunger to open and close, a spring for supporting the plunger elastically, It is formed in the lower portion of the discharge port and has a drain hole for opening and closing by the plunger to drain the oil to the outside.

According to the cooling jet structure for piston cooling according to the present invention, when the engine is operated at a high speed, the oil pressure of the main gallery is 3.6bar or more when the oil is supplied to the cooling jet, by appropriately draining the oil through the cooling jet, It ensures that the oil is injected into the piston accurately without spreading to the side, so that the piston is always cooled efficiently regardless of the operating area of the engine, thereby eliminating the problem of seizure due to the overheating of the piston and the impact of related parts. It works.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

5 shows an internal cross section of the cooling jet according to the present invention, that is, an oil chamber 11a is formed inside the housing 11 fixedly mounted to the lower part of the cylinder block, not shown, and the housing ( An inlet port 11b through which oil is supplied to the inside of the 11 is formed to communicate with the chamber 11a along the longitudinal direction of the housing 11, and the housing in a direction perpendicular to the supply port 11b. On one side of the (11) is formed a discharge port (11c) for discharging the oil introduced into the housing to the outside in communication with the chamber.

Therefore, the inflow port 11b and the discharge port 11c communicate with each other via the chamber 11a.

In addition, an oil supply pipe (not shown) for spraying oil with a piston is connected to the discharge port 11c.

The plunger 12 is inserted into the chamber 11a to open and close the inlet port 11b and the discharge port 11c, and is installed to be movable up and down, and a spring that elastically supports the plunger 12. (13) is inserted into the chamber (11a), the spring seat 13 is fixedly mounted to the chamber (11a) so that one end of the spring (13) is seated on the spring seat (14) The other end of the spring 13 is inserted into the plunger 12 to elastically support the plunger.

A drain hole 11d for discharging the oil supplied in the chamber 11a to the outside of the chamber is formed in the lower portion of the discharge port 11c so as to communicate with the chamber 11a.

The drain hole 11d is formed to be opened and closed by the plunger 12.

Figure 6 shows the operating state when the cooling jet according to the present invention when the oil pressure of the main gallery in the low and medium speed operation region of the engine is 3.6bar or less, through the inlet port (11b) of the chamber of the cooling jet ( 11a) The oil introduced into the interior is sprayed into the piston through the discharge port 11c by pushing the plunger 12 downward with the pressure to open the discharge port 11c, thereby cooling the piston properly.

The drain hole 11d is blocked by the plunger 12 so that oil is not drained out of the chamber through the drain hole.

7 shows an operating state when the cooling pressure of the main gallery in the high-speed operating region of the engine according to the present invention when the oil pressure of the main gallery is 3.6 bar or more, and the oil pressure supplied to the inside of the chamber 11a is 3.6 bar. If it is above, the plunger 12 is pushed deep into the chamber by the oil pressure, so that the discharge port 11c and the drain hole 11d are opened at the same time, and thus oil forming an excess pressure of 3.6 bar or more is By draining out of the chamber through the drain hole, the oil pressure inside the chamber does not rise above 3.6 bar.

Therefore, the oil pressure is excessive, so that the oil sprayed through the cooling jet does not spread to the side, it is accurately sprayed to the piston, it is possible to efficiently and uniformly cool the piston.

1 is an installation state diagram of a cooling jet for cooling a piston according to the prior art,

2 is a cross-sectional view of a cooling jet according to the prior art,

3 is an operating state diagram in a low speed and a medium speed operating area of a cooling jet engine according to the prior art;

4 is an operating state diagram in a high speed operating region of an engine of a cooling jet according to the prior art;

5 is a sectional view of a cooling jet for cooling a piston according to the present invention;

6 is an operating state diagram in a low speed and a medium speed operation region of an engine of a cooling jet according to the present invention;

7 is an operating state diagram in the high speed operating region of the engine of the cooling jet according to the present invention.

<Description of Symbols for Main Parts of Drawings>

11-housing 12-plunger

13-spring 14-spring seat

11d-drain hole

Claims (3)

An inlet port 11b receiving oil, a discharge port 11c for spraying oil with a piston, the inlet port 11b and a discharge port are plunger 12 that opens and closes, and elastically supports the plunger 12. Cooling jet structure for a piston cooling having a spring (13) and a drain hole (11d) formed in the lower portion of the discharge port (11c) to open and close by the plunger (12) to drain the oil to the outside. The method of claim 1, wherein the inlet port (11b) and the discharge port (11c) is formed in a direction perpendicular to each other in the housing 11, the interior of the housing 11, the inlet port and the discharge port is in communication with the chamber ( 11a) is formed, the cooling jet structure for piston cooling, characterized in that the plunger (12) is inserted into the chamber (11a) to be movable. The method according to claim 2, wherein the spring seat 14 is fixedly mounted inside the chamber 11a, and the spring 13 is interposed between the spring seat 14 and the plunger 12 to support the plunger. Cooling jet structure for piston cooling characterized in that it is to.
KR1020070124210A 2007-12-03 2007-12-03 Cooling jet structure for piston KR20090057574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070124210A KR20090057574A (en) 2007-12-03 2007-12-03 Cooling jet structure for piston

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070124210A KR20090057574A (en) 2007-12-03 2007-12-03 Cooling jet structure for piston

Publications (1)

Publication Number Publication Date
KR20090057574A true KR20090057574A (en) 2009-06-08

Family

ID=40988313

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070124210A KR20090057574A (en) 2007-12-03 2007-12-03 Cooling jet structure for piston

Country Status (1)

Country Link
KR (1) KR20090057574A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2754862A1 (en) * 2012-04-04 2014-07-16 Toyota Jidosha Kabushiki Kaisha Oil jet
WO2019176270A1 (en) * 2018-03-16 2019-09-19 日立オートモティブシステムズ株式会社 Control device for variable-displacement oil pump and control method therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2754862A1 (en) * 2012-04-04 2014-07-16 Toyota Jidosha Kabushiki Kaisha Oil jet
EP2754862A4 (en) * 2012-04-04 2015-01-14 Toyota Motor Co Ltd Oil jet
WO2019176270A1 (en) * 2018-03-16 2019-09-19 日立オートモティブシステムズ株式会社 Control device for variable-displacement oil pump and control method therefor

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