WO2014077964A1 - Système de refroidissement de piston - Google Patents

Système de refroidissement de piston Download PDF

Info

Publication number
WO2014077964A1
WO2014077964A1 PCT/US2013/062788 US2013062788W WO2014077964A1 WO 2014077964 A1 WO2014077964 A1 WO 2014077964A1 US 2013062788 W US2013062788 W US 2013062788W WO 2014077964 A1 WO2014077964 A1 WO 2014077964A1
Authority
WO
WIPO (PCT)
Prior art keywords
body portion
piston
hub
inlet pipe
cooling arrangement
Prior art date
Application number
PCT/US2013/062788
Other languages
English (en)
Inventor
Sarang THAKARE
Original Assignee
Cummins Inc.
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 Cummins Inc. filed Critical Cummins Inc.
Publication of WO2014077964A1 publication Critical patent/WO2014077964A1/fr

Links

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

Definitions

  • the present disclosure relates to the field of piston cooling nozzles for an engine.
  • Conventional piston cooling arrangement used for cooling of the pistons/plungers requires a piston cooling nozzle (PCN) in combination with a specific construction of the pistons/plungers.
  • PCN piston cooling nozzle
  • Conventional piston cooling arrangement using the PCN has an inlet which receives cooling oil/fluid at a rifle pressure from an oil rifle located in an engine block. An outlet is provided to direct the cooling oil/fluid toward the piston, resulting in a divergent and non-targeted plume of cooling oil to be sprayed onto the piston. This results in spraying of the cooling oil/fluid against the piston/plunger surfaces which are not critical and preferred surface for most effective cooling and heat transfer from the pistons/plungers.
  • conventional piston cooling arrangement causes insufficient cooling of the surface of the piston/plunger due to incorrectly directed and non-uniform application of cooling oil/fluid on the piston/plunger surface. This results in cracking of the pistons due to temperature differentials arising out of localized "hot spots" on the piston surface resulting from insufficient cooling of the surface of the piston/plunger.
  • a piston cooling arrangement for delivering cooling fluid to a piston of an internal combustion engine, the arrangement comprising:
  • the hub may be integrally formed during casting of the body portion. Typically, a single inlet pipe may be insert molded within the body portion. The body portion may be machined to define the hollow of the hub.
  • a portion of the inlet pipe within the hollow may be deformed to form the at least one opening during the machining process.
  • the hub may be formed by precisely positioning an insert and molding the insert during casting of the body portion.
  • two inlet pipes may be insert molded within the body portion.
  • the two inlet pipes may be positioned diametrically opposite each other to direct the cooling fluid within the hollow.
  • At least one dowel may be integrally formed on the body portion during casting.
  • the at least one bolting hole may be defined on the body portion by machining.
  • the at least one bolting hole may be formed by insert molding at least one bolting hole insert during casting of the body portion.
  • the at least one inlet pipe may extend from either ends of the body portion.
  • the size of the at least one inlet pipe may be variable corresponding to the quantity of cooling fluid to be supplied to the hollow.
  • a method for manufacturing a piston cooling arrangement for delivering cooling fluid to a piston comprising the steps of:
  • the step of configuring may be followed by a step of knurling the tubes.
  • the step of pouring casting material includes integrally forming at least one dowel on the body portion.
  • the step of defining the at least one bolting hole is carried out by machining the body portion.
  • the step of defining the hollow hub is carried out by machining the body portion.
  • the step of providing the at least one opening includes the step of deforming a portion of the at least one inlet pipe to form the at least one opening.
  • the step of pouring may be preceded by the step of precisely positioning at least one bolting hole insert and a hub insert for respectively defining the at least one bolting hole and the hollow hub on the body portion.
  • the step of providing includes insert molding two inlet pipes positioned diametrically opposite each other to direct the cooling fluid within the hollow hub.
  • Figure 1 illustrates a perspective top view of the piston cooling arrangement in accordance with the present disclosure
  • Figure 2 illustrates a bottom view of the of the piston cooling arrangement shown in Figure 1;
  • Figure 3 illustrates a perspective bottom view of the piston cooling arrangement shown in Figure 1;
  • Figure 4 illustrates an imaginary cutting circle for forming an opening in a tube for supplying cooling oil/fluid
  • Figure 5 illustrates the opening in the tube for supplying cooling oil/fluid to a piston/plunger
  • Figure 6 illustrates an alternate embodiment of the piston cooling arrangement with metal inserts molded into a body portion
  • Figure 7 illustrates the metal inserts to be molded into the body portion shown in Figure 6;
  • Figure 8 illustrates the path of cooling oil/fluid in the piston cooling arrangement illustrated in Figure 6.
  • Conventional piston cooling arrangement includes a Piston Cooling Nozzle (PCN) having an inlet for receiving cooling oil/fluid and an outlet for spraying the cooling oil/fluid received from the inlet onto the surface of a piston/plunger.
  • PCN Piston Cooling Nozzle
  • conventional piston cooling arrangement results in divergent and non-targeted plume of cooling oil sprayed against the surface of the piston/plunger. This results in an inaccurate application of cooling oil/fluid leading to creation of "hot spots" on the piston/plunger surface.
  • the "hot spots” on the piston surface results in temperature differentials which causes cracking of the pistons/plungers.
  • United States Patent Number US4979473 discloses a nozzle used to cool the underside of a piston mounted in an engine.
  • the nozzle includes a two piece assembly which includes a structural body attached to the engine and a formed tube having one end forming an orifice and the other end attached to the body.
  • the body includes a passage and a bore intersecting the passage. The end of the tube attached to the body is positioned in the bore.
  • One major disadvantage of US4979473 is that the flow area between the two pieces of the assembly fails to provide a smooth and efficient flow of cooling fluid.
  • United States Patent Application US20100095910 discloses a piston cooling nozzle comprising a nylon body having a hub, a pair of integral legs extending from the hub and a tube for delivering coolant to a piston.
  • the pair of integral legs is formed relative to the hub and the tube to ensure that when the body is mounted to an engine block, the legs are engaged to a cylinder liner in order to position the tube between a skirt of the piston and a connecting rod coupled to the piston.
  • One disadvantage of US20100095910 is that the piston cooling nozzle is difficult to manufacture as the tube is required to be mounted at a precise location and at a precise angle.
  • piston cooling arrangement in accordance with this disclosure is generally indicated by the reference numeral 10 and is particularly shown in Figure 1 to Figure 3 of the drawing.
  • FIG 1 to Figure 3 illustrates a piston cooling arrangement (10) for cooling a piston/plunger of an engine, typically a V-shaped engine.
  • the piston cooling arrangement (10) includes an inlet pipe (12) and a body portion (14) defining a hub (16).
  • the inlet pipe (12) is configured to direct cooling oil/fluid towards a corresponding piston/plunger.
  • the inlet pipe (12) is made of metal, typically steel.
  • the inlet pipe (12), having an inlet end portion (13a) and an outlet end portion (13b), is bent to a predetermined shape, forming a curve with an arcuate portion at the center, defining a passage for cooling oil/fluid.
  • the inlet pipe (12) is bent such that an arcuate portion (17), shown in Figure 3, is formed at the center of the inlet pipe (12).
  • a secondary operation of knurling is carried out on the inlet pipe (12) at a plurality of locations in order to ensure proper gripping of the inlet pipe (12).
  • the predetermined shape of the inlet pipe (12) is dependent on the desired flow rate of the cooling oil/fluid and constraints involved in packaging and/or manufacturing of the piston cooling arrangement (10).
  • the inlet pipe (12) is positioned in a mould for casting the body portion (14) so as to locate the inlet pipe (12) within the body portion (14) as an insert.
  • the inlet pipe (16) is positioned within the mould of the body portion (14) such that when the cast and cooled body portion (14) is withdrawn from the mould, the inlet end portion (13a) and the outlet end portion (13b) of the inlet pipe (13) projects from opposite ends of the body portion (14).
  • the body portion (14) typically made of aluminum, is cast to a predetermined shape depending on the engine on which it is to be mounted.
  • the cast and cooled body portion (14), with the inlet pipe (12), insert molded therewithin includes a hub (16), bolting holes (15) and at least one dowel (18) which are integrally formed on the cast body portion (14).
  • the hollow (20) has a diameter equal to the diameter of an imaginary circle (24), shown in Figure 4.
  • the bolting holes (15) are formed by performing machining operation on the body portion (14).
  • the dowels (18) are typically tapering in shape and enable orientation of the piston cooling arrangement (10) on the engine.
  • the inlet pipe (12) is positioned within the body portion (14) such that the hollow (20) of the hub (16) is at least partially encompassed by the arcuate portion (17) of the inlet pipe (12).
  • the arcuate portion (17) of the inlet pipe (16) is cut out along the imaginary circle (24), as shown in Figure 4, to form an opening (22), illustrated on Figure 5.
  • the opening (22), typically arcuate in shape, is defined along the length of the curve of the inlet pipe (12) for supplying cooling oil/fluid for substantially uniformly applying the cooling oil/fluid to the surface of the piston/plunger and enable targeted cooling of the piston/plunger.
  • the bolting holes (15) and the hub (16), illustrated in Figure 2 are formed by using bolting hole insert (31) and hub insert (32) respectively, as shown in Figure 7.
  • the hub insert (32) defines the hollow (20) of the hub (16).
  • Two inlet pipes (34 and 36) having a predetermined length and a predetermined shape are press-fitted into the hub inset (32) so as to be diametrically opposite each other.
  • the two inlet pipes (34 and 36) are positioned diametrically opposite to cause the cooling oil/fluid to flow with an increased plume angle through the inlet pipes (34 and 36) into the hollow (20), along the direction of the arrows, illustrated in Figure 8, for cooling the piston/plunger.
  • the bolting hole insert (31), the hub insert (32) and the inlet pipes (34 and 36), made of metal, are precisely located within a mould for casting a body portion (38) such that the bolting hole insert (31), the hub insert (32) and the inlet pipes (34 and 36) are positioned within the body portion (38), as shown in Figure 6.
  • the body portion (38) is cast from a polymeric material, typically plastic.
  • the delivery of the cooling oil/fluid to the surface of the piston is governed by the shape of the opening (22), as illustrated in Figure 5, or the plume angle of the cooling fluid formed between the inlet pipes (34 and 36). Further the quantity of the cooling fluid is governed by the passage defined within the inlet pipe (12) and the inlet pipes (34 and 36) for flow of the cooling oil/fluid and the restrictions provided to the flow of the cooling oil/fluid within the inlet pipe (12) and the inlet pipes (34 and 36).
  • the restriction to the flow of the cooling oil/fluid through the inlet pipe (12) and the inlet pipes (34 and 36) is caused by a plurality of bends and sharp turns defined thereon.
  • the dimension of the inlet pipe (16) and the inlet pipes (34 and 36) are varied.
  • a check valve (not shown in Figure) is provided to ensure adequate supply of cooling oil/fluid to the piston/plunger when the pressure of the oil in an oil gallery exceeds the cracking pressure of the piston/plunger surface.
  • the technical advancements offered by the present disclosure include the realization of: • accurately maintaining close clearances between moving
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
  • spatially relative terms such as “inner,” “outer,” “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures.
  • Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features.
  • the example term “below” can encompass both an orientation of above and below.
  • the device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Landscapes

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

Abstract

Le système de refroidissement de piston (10) selon la présente invention permet la distribution d'un liquide de refroidissement pour le refroidissement d'un piston d'un moteur à combustion interne. Le système de refroidissement de piston (10) comprend une partie de corps (14) comprenant un moyeu creux (16) et au moins un trou de boulonnage. Au moins une conduite d'admission (12) comprenant une ouverture est moulée par insertion à l'intérieur de la partie de corps (14) pour l'alimentation en liquide de refroidissement à l'intérieur du moyeu creux (16) afin de refroidir le piston qui est guidé à l'intérieur de celui-ci.
PCT/US2013/062788 2012-10-10 2013-10-01 Système de refroidissement de piston WO2014077964A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2974MU2012 2012-10-10
IN2974/MUM/2012 2012-10-10

Publications (1)

Publication Number Publication Date
WO2014077964A1 true WO2014077964A1 (fr) 2014-05-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2013/062788 WO2014077964A1 (fr) 2012-10-10 2013-10-01 Système de refroidissement de piston

Country Status (1)

Country Link
WO (1) WO2014077964A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017038756A1 (fr) * 2015-09-04 2017-03-09 いすゞ自動車株式会社 Dispositif de refroidissement de piston
EP3415736A1 (fr) * 2017-06-16 2018-12-19 Illinois Tool Works, Inc. Ensemble de jet de refroidissement de piston
CN112065683A (zh) * 2019-06-11 2020-12-11 卡特彼勒公司 多缸空气压缩机的冷却块
USD921044S1 (en) * 2019-08-02 2021-06-01 Transportation Ip Holdings, Llc Piston cooling apparatus
USD928201S1 (en) * 2019-08-02 2021-08-17 Transportation Ip Holdings, Llc Piston cooling apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4508065A (en) * 1983-03-21 1985-04-02 General Motors Corporation Piston cooling oil delivery tube assembly
US20040040520A1 (en) * 2002-09-02 2004-03-04 Christophe Bontaz Multiple spray engine cooling nozzle and engines equipped with such nozzles
US20090235895A1 (en) * 2005-11-29 2009-09-24 Hino Motors, Ltd. Lubricating structure for engine
US20100001103A1 (en) * 2007-09-07 2010-01-07 Jose Correa Neto Piston cooling jet with tracking ball orifice
JP2011163265A (ja) * 2010-02-12 2011-08-25 Daihatsu Motor Co Ltd 内燃機関におけるピストンの潤滑油による冷却装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4508065A (en) * 1983-03-21 1985-04-02 General Motors Corporation Piston cooling oil delivery tube assembly
US20040040520A1 (en) * 2002-09-02 2004-03-04 Christophe Bontaz Multiple spray engine cooling nozzle and engines equipped with such nozzles
US20090235895A1 (en) * 2005-11-29 2009-09-24 Hino Motors, Ltd. Lubricating structure for engine
US20100001103A1 (en) * 2007-09-07 2010-01-07 Jose Correa Neto Piston cooling jet with tracking ball orifice
JP2011163265A (ja) * 2010-02-12 2011-08-25 Daihatsu Motor Co Ltd 内燃機関におけるピストンの潤滑油による冷却装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017038756A1 (fr) * 2015-09-04 2017-03-09 いすゞ自動車株式会社 Dispositif de refroidissement de piston
EP3415736A1 (fr) * 2017-06-16 2018-12-19 Illinois Tool Works, Inc. Ensemble de jet de refroidissement de piston
CN112065683A (zh) * 2019-06-11 2020-12-11 卡特彼勒公司 多缸空气压缩机的冷却块
USD921044S1 (en) * 2019-08-02 2021-06-01 Transportation Ip Holdings, Llc Piston cooling apparatus
USD928201S1 (en) * 2019-08-02 2021-08-17 Transportation Ip Holdings, Llc Piston cooling apparatus

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