EP3147469A1 - Hydraulikspielausgleichselement - Google Patents

Hydraulikspielausgleichselement Download PDF

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Publication number
EP3147469A1
EP3147469A1 EP16187707.1A EP16187707A EP3147469A1 EP 3147469 A1 EP3147469 A1 EP 3147469A1 EP 16187707 A EP16187707 A EP 16187707A EP 3147469 A1 EP3147469 A1 EP 3147469A1
Authority
EP
European Patent Office
Prior art keywords
plunger
hla
chamber
bore
valve train
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.)
Granted
Application number
EP16187707.1A
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English (en)
French (fr)
Other versions
EP3147469B1 (de
Inventor
Majo Cecur
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.)
Eaton Intelligent Power Ltd
Original Assignee
Eaton SRL
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 Eaton SRL filed Critical Eaton SRL
Publication of EP3147469A1 publication Critical patent/EP3147469A1/de
Application granted granted Critical
Publication of EP3147469B1 publication Critical patent/EP3147469B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem and rocker arm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L2001/2433—Self contained, e.g. sealed hydraulic lash adjusters

Definitions

  • the present invention relates to an hydraulic lash adjuster apparatus.
  • the HLA P1 comprises a first oil-containing pressure chamber P2 defined between an outer body P3 and a plunger assembly P4 slidably mounted within the outer body P3, and a spring P5 arranged to enlarge the first chamber P2 by pushing the plunger assembly P4 outwardly relative to the outer body P3 to extend the HLA P1 to take up slack in a valve train assembly.
  • the outward movement of the plunger assembly P4 relative to the outer body P3 pushes a rocker arm P10 of the valve train assembly away relative to the outer body P3, and any slack in the valve train assembly is thereby removed.
  • the plunger assembly P4 defines a second oil containing pressure chamber P6 which is in fluid communication with the engine's oil supply (not shown).
  • An aperture P7 between the first chamber P2 and the second chamber P6 allows oil to flow from the second chamber P6 into the first chamber P2, via a one way valve P8, when the HLA P1 extends.
  • the one way valve P8 comprises a ball P8a captured by a cage P8b and biased by a spring P8c to a position closing the aperture P8.
  • a typical HLA can extend to accommodate any slack in a valve train assembly (not shown in figure 1 ), such as between a cam and a roller, but, after it is extended, the incompressible oil in the first chamber P2 provides sufficient rigid support for the HLA P1 to open a valve when, for example, a rocker arm pivots under the control of a cam (i.e. the incompressible oil prevents the plunger assembly P4 being pushed back inwardly of the outer body P3 so that the HLA P1 acts as a solid body).
  • the oil can escape the first chamber P2 only slowly, for example, via a small annular 'leak-down' gap P9 defined by closely spaced leak down surfaces of the outer body P3 and the plunger assembly P4. This oil leakage down the leak down surfaces from the first chamber P2 allows the HLP P1 to retract again.
  • HLAs are positioned between two components of the valve train.
  • HLA P1 may be installed between, for example, a valve, a valve bridge that carries a pair of valves or a push rod that carries a valve illustrated schematically as P11 and a rocker arm illustrated schematically as P10 of a valve train.
  • the HLA P1 is housed in a cavity of a rocker arm with the bottom of the outer body P3 extending out from that aperture.
  • Such an arrangement can limit the compactness of engines due to the space that the arrangement consumes.
  • moving parts in an engine for example, components such as a rocker arm containing a HLA
  • a static part of the engine for example, a fuel injector
  • a typical HLA such as P1 there are limits on the extent to which the size of a typical HLA such as P1 can be reduced.
  • one limit on the size of a typical HLA such as P1 is due to the limits on the maximum value of the pressure that the oil in first chamber P2 should reach when in use.
  • the pressure of the oil in the first chamber P2 is dependant, among other things, on the diameter of the plunger assembly P4.
  • typical HLAs such as P1 have a given minimum size.
  • a hydraulic lash adjuster for use with a valve train component comprising a first body that defines a first bore; the HLA comprising: a second body that defines a second bore; and a plunger; wherein, in use, a first end of the plunger is mounted within the first bore, and a second end of the plunger is mounted within the second bore for reciprocal sliding movement with respect to the second body; wherein the second body and the plunger define a first chamber for containing a hydraulic fluid and the plunger defines a second chamber for supplying hydraulic fluid to the first chamber through a valve located between the first and second chambers in response to movement of the plunger increasing the volume of the first chamber; and wherein, in use, all of the second body is located outside of the first body.
  • HLA hydraulic lash adjuster
  • This provides for a HLA that is compact compared to existing corresponding HLAs.
  • an arrangement for a valve train assembly in an internal combustion engine comprising: the HLA according to the first aspect; and the valve train component comprising the first bore.
  • FIG. 2 schematically illustrates a valve train assembly 2 comprising a rocker arm 4 according to an example embodiment of the present invention.
  • the valve train assembly 2 may be, for example, a standard overhead cam (SOHC) valve train.
  • SOHC standard overhead cam
  • the rocker arm 4 comprises a hydraulic lash adjustment arrangement 6 at one end 14 thereof and a roller 10 rotatably mounted on an axle 12 at the other end 8 thereof.
  • the rocker arm 4 is pivotally mounted, at around its midpoint, on a rocker arm axle 16.
  • the hydraulic lash adjustment arrangement 6 comprises an outer body 30 and a plunger 38 (to be described in more detail below).
  • the outer body 30 comprises a part spherical end 17 for engaging a complimentary shaped socket of a so called 'Elephant' foot 19 that engages a valve (bridge) carrying or engaging component 20.
  • the component 20 may be a valve bridge that carries a pair of exhaust valves 18 or a pair of inlets valves 18 of an engine cylinder 21.
  • the component 20 may be a push rod that engages a single exhaust valve 18 or a single inlet valve 18 of the engine cylinder 21.
  • a cam 22 mounted on a cam shaft 24 has a lobe 24a which as the cam 22 rotates with the cam shaft 24 engages the roller 10 and thus causes the rocker arm 4 to pivot counter clockwise, as shown in the drawing, about the axle 16 whereby the plunger 38 depresses the valve 18 (or valves) against the force of a valve spring (not shown) to open the valve (or valves) 18.
  • the valve (or valves) 18 begins to close under the action of a valve spring(s) (not shown).
  • a base circle 24b of the cam 22 is engaged with the roller 10 the valve (or valves) 18 is fully shut.
  • the rocker arm 4 defines, at the first end 14 thereof, a bore 301 formed along a longitudinal axis A-A of the first end 14.
  • the bore 301 extends part way into the rocker arm 4 from a surface 304 of the rocker arm 4 to a bore end 306 within the rocker arm 4.
  • a first end 400 of the plunger 38 of the hydraulic lash adjustment arrangement 6 is mounted in the bore 301 of the rocker arm 4 and is fixedly connected to the rocker arm 4.
  • a clip 380 (e.g. "C" shaped) partially sitting in a circumferential cavity 384 of the first end 400 of the plunger 38 abuts against a corresponding cavity 62 of the bore 301 within the rocker arm 4 to hold the plunger 38 fixed with respect to the rocker arm 4.
  • the clip 380 is placed in the cavity 384 of the plunger, and when the plunger 38 is inserted into the bore 301 of the rocker arm 4, the clip 380 snaps (i.e.
  • the clip 380 may be a wire clip and may be any suitable state, e.g. toroidal.
  • a second end 410 of the plunger 38 extends out of the bore 301 beyond the rocker arm 4.
  • the outer body 30 of the hydraulic lash adjustment arrangement 6 has a closed end 32 and an open end 34 and defines a longitudinal bore 36 between the closed 32 and open 34 ends.
  • the closed end 32 is formed partly spherical and is for engaging the complimentary shaped socket 19 that engages the valve carrying or engaging component 20 (not shown in figures 3 and 4 ).
  • the second end 410 of the plunger 38 is mounted for sliding movement back and forth within the bore 36 of the outer body 30, the upper end 400 of the plunger 38 extending above the bore 36.
  • the outer body 30 does not extend into the bore 301 of the rocker arm 4, that is, the whole of the outer body 30 is located outside of the rocker arm 4.
  • the outer diameter of the outer body 30 is not larger than the outer diameter of the end 14 of the rocker arm 4 in which the plunger 38 is mounted. That is, the radial profile of the outer body 30 does not extend beyond the profile of the end 14 of the rocker arm 4 in which the plunger 38 is mounted. More specifically, no part of the outer body 30 extends beyond the end 14 of the rocker arm 4 in which the plunger 38 is mounted in a direction parallel to the axis along which plunger 38 and outer body 30 reciprocally slide.
  • the first end 400 of the plunger 38 is mounted in bore 301 of rocker arm 4, and the second end 410 of the plunger 38 is mounted in bore 36 of the outer body.
  • the length of the second end 410 of the plunger 38 that is mounted (i.e. mountable) in bore 36 of the outer body 30 is less than 80% of the total length of the plunger 38. This is different to typical HLAs such as HLA P1 in figure 1 , in which the length of the plunger P4 mountable in outer body P3 is typically a minimum of 80% of the total length of the plunger P4.
  • the length of the second end 410 of the plunger 38 mountable in bore 36 of the outer body 30 being less than 80% of the total length of the plunger 38 allows the first end 400 of the plunger 38 to be securely mounted in bore 301, and fixedly connected to the rocker arm 4.
  • the length of the second end 410 of the plunger 38 that is mounted (i.e. mountable) in bore 36 of the outer body 30 is in the range of 50% to 80% of the total length of the plunger 38, and preferably is in the range of 50% to 65% of the total length of the plunger 38, although this percentage may be even less than 50%.
  • the length of the first end 400 of the plunger 38 is a significant proportion, for example in the range 30% to 50%, or an even higher percentage, of the total length of the plunger 38.
  • the ratio of the total length of the plunger 38 to the outer diameter of the plunger 38 is greater than 2, for example, the ratio may be in the range 2.3 to 3.5, and preferably is in the range 2.3 to 2.5, although other ratios may be used. This is different to typical HLAs such as HLA P1 in figure 1 , in which the ratio of the total length of the plunger assembly P4 to the outer diameter of the plunger assembly P4 is typically 2 or less.
  • the plunger 38 and the outer body 30 define between them a first oil chamber 40 towards the bottom of the bore 36 of the outer body 30 (i.e. towards the bottom of the hydraulic lash adjustment arrangement 6).
  • An aperture 42 at the bottom of the plunger 38 allows oil to flow from a second oil chamber, or oil reservoir, 44 within the plunger 38 into the first oil chamber 40 when the hydraulic lash adjustment arrangement 6 expands.
  • a ball valve 46 is provided below the aperture 42 which comprises a ball 48 captured by a cage 50 and biased by a spring 52 to a position closing the aperture 42.
  • the plunger assembly 38 is biased outwardly of the outer body 30 by means of a spring 54 held within the first oil chamber 40.
  • the spring 54 expands the overall length of the hydraulic lash adjustment arrangement 6 by pushing the plunger 38 outwardly of the outer body 30 so as to take up any slack in the valve train assembly 2.
  • the volume of the first chamber 40 increases and a resulting oil pressure differential across the ball 48 moves it against the bias of the spring 52, opening the aperture 42 and enabling oil to flow from the second oil chamber 44 into the first oil chamber 40.
  • a clip 324 encompasses the outside of the outer body 30 at end 34 of the outer body 30 and sits in recess 396 in the outside of outer body 30 so as to be fixedly connected to outer body 30.
  • the outer surface of the plunger 316 has steps 395 and 397 that define between them a shallow cavity 399 in the outer surface of the plunger 38.
  • the clip 324 comprises a section 386 that extends into the bore 36 of the outer body so as to engage or abut against either step 395 or step 397 in the outer surface of the plunger 316 and thereby restricting sliding movement of the outer body 30 with respect to the plunger 38 to within the range defined by the distance between the steps 395 and 397.
  • the clip 324 prevents the outer body 30 from sliding off of the plunger 38 completely when the rocker arm is not connected in a valve train, for example during shipping of the rocker arm 4, or during a service of the engine comprising the rocker arm 4.
  • the clip 324 lies within the profile of the outer body 30, that is, the radial extent of the clip is not more than the radial extent of the outer body 30.
  • the clip 324 therefore does not impact the space consumed by the hydraulic lash adjustment arrangement 6.
  • the clip 324 may be removed from the outer body 30 after the hydraulic lash adjustment apparatus 6 is installed in a valve train, or if left in situ, does not perform any function in the operating HLA.
  • the outer body 30 of the hydraulic lash adjustment apparatus 6 does not extend into rocker arm 4. That is, the whole of the outer body 30 is located outside of the rocker arm 4, including during use.
  • This is different to typical arrangements such as shown in figure 1 using typical HLAs such as HLA P1, where the outer body P3 extends into rocker arm P10.
  • having only the plunger 38 (and not the outer body 30) extending into the bore 301 of rocker arm 4 allows for the thickness of end 14 of rocker arm 4 to be reduced (by at least the thickness of the outer body walls that would have otherwise been inside the rocker arm), and hence allows for a more compact engine design.
  • the outer diameter of the outer body 30 is not larger than the outer diameter of the end 14 of the rocker arm 4 in which the plunger 38 is mounted. This allows for the overall space that the combination of end 14 of rocker arm 4 and outer body 30 consume (at least radially with respect to the outer body 30) to be small, and hence also allow for more compact engine design.
  • the outer diameter of the plunger 38 may typically be, for example, in the range of 11 mm to 16 mm, the outer diameter of the outer body 30 may correspondingly be in the range 16 mm to 22 mm, and the outer diameter of the end 14 of rocker arm 4 may be correspondingly in the range 24 mm to 30 mm.
  • the outer diameter of the plunger 38 is preferably 11 mm, the outer diameter of the outer body 30 is preferably 16 mm, and the outer diameter of end 14 of the rocker arm 4 is preferably 24 mm.
  • the outer diameter of the plunger 38 is preferably 16 mm
  • the outer diameter of the outer body 30 is preferably 22 mm
  • the outer diameter of end 14 of the rocker arm 4 is preferably 30 mm.
  • the reduced space burden associated with the hydraulic lash adjustment apparatus 6 may be of particular use, for example, in a medium duty engine valve train, where a rocker arm 4 is typically positioned in close proximity to fuel injectors (not shown in the figures) that are static with respect to the engine block.
  • the reduced radial profile of the hydraulic lash adjustment apparatus 6 allows for the rocker arm 4 to be placed closer to the static fuel injector whilst still fulfilling the requirement that the moving rocker arm 4 does not pass closer than a minimum distance (e.g. 2.5 mm) to the static a fuel injector.
  • a minimum distance e.g. 2.5 mm
  • the oil in the second oil chamber 44 is kept supplied from the engine's oil supply (not shown) via an oil supply path at least in part defined by a first conduit (not shown) formed in the rocker shaft 16 and a second conduit 56 drilled through the rocker arm 4 from an aperture 60, through which the rocker shaft 16 (not shown in Figure 4 ) extends, to the recess 62 in which the plunger 38 is supported by the clip 62.
  • Oil supplied via the oil supply path into the cavity 62 can flow into the first oil chamber 44 through a hole 64 formed through a side wall 65 of the plunger 38.
  • the ratio of the total length of the plunger 38 to the outer diameter of the plunger 38 is significantly greater than 1.5, for example, the ratio may be in the range 2 to 3. This is different to typical arrangements such as shown in figure 1 using typical HLAs such as HLA P1, where the corresponding ratio is typically around 1.5.
  • the oil reservoir 44 within the plunger 38 has an increased length, and hence increased volume compared to typical HLAs.
  • the resulting larger volume of oil that can be stored in the oil reservoir 44 is useful for the operation of the hydraulic lash adjustment apparatus 6 for example when an engine in which the hydraulic lash adjustment apparatus 6 is installed is cold, and hence the oil supply to the reservoir 44 via the second conduit 56 is delayed.
  • the top of the second oil chamber 44 within plunger 38 is closed by a lid portion 388.
  • the lid portion 388 is supported by a recess 390 in the inner walls of the outer body 30, and is fixedly connected thereto, for example via a press fit.
  • the lid portion 388 is concave so as to extend partially into the second oil chamber 44 of the outer body 30. This allows a space between the lid portion 388 and the bore end 306 of rocker arm 4 to fit a bolt 76 (described in more detail below).
  • the lid portion 388 substantially prevents oil from spilling from the oil chamber 44.
  • the lid portion 388 has an aperture 320 extending all of the way through the lid portion 388.
  • the aperture 320 is threaded and, in use, a bolt 76 is received in the aperture 320 so as to substantially prevent oil from leaking from the first oil chamber 44 through the aperture 320.
  • the lid portion 388 is concave to ensure that the bolt 76 does not extend beyond the outer profile of the plunger 38 when fitted into aperture 320, that is to ensure the bolt 76 does not come into contact with the rocker arm 4.
  • force may be transferred between the rocker arm 4 and the plunger 38 directly via the plunger 38 itself, and not via lid portion 388 or bolt 76.
  • the concave shape of the lid portion 388 allows the lid portion to 388 to be easily pressed from a thin metal sheet.
  • the concave shape allows for a reliable press fit of the lid portion 388 into the recess 390 in the inner walls of the outer body 30.
  • the lid portion 388 need not necessarily be concave.
  • the lid portion 388 may instead may be substantially flat, but have a recessed portion (not shown in the figures) in which the bolt 76 may be located such that the bolt 76 does not extend beyond the outer profile of the plunger 38.
  • the aperture 320 has a diameter that is large enough so that during assembly and/or testing of the hydraulic lash adjustment apparatus 6 it is possible to insert a needle, or any other suitable implement or tool through the aperture 320 to repeatedly push down on and hence open the ball 48 so that oil can flow from the first chamber 44 to the second chamber 40.
  • This procedure is known as the 'pump-up' procedure.
  • the 'pump-up' procedure is commonly performed when testing the leakage characteristics of the hydraulic lash adjustment apparatus 6 to ensure first that the chamber 40 is suitably filled with oil.
  • the 'pump-up' procedure may be performed prior to a measurement of the so called 'leak-down time' of the hydraulic lash adjustment apparatus 6, i.e. the characteristic time taken for oil to leak from the second oil chamber 40.
  • the bolt 76 has an engagement recess (not shown) for allowing the bolt 76 to be screwed and unscrewed from the aperture 320 using, for example a screwdriver or the like that engages with the engagement recess.
  • the bolt 76 when in place, substantially prevents oil from spilling out of the first chamber 44 through the aperture 320. Preferably, however, even when the bolt 76 is screwed tightly into the aperture 320, the bolt 76 does not form an airtight seal between the first oil chamber 44 and the outside of the first oil chamber 44 so that air can be purged from the first oil chamber 44 when the housing 318 fills with oil.
  • the bolt 76 does not form an airtight seal due to the small gaps (not shown) between the thread of the bolt 76 and the thread of the aperture 320. In an alternative example, the bolt 76 does not form an airtight seal because of one or more narrow longitudinal holes (not shown) running from one end of the bolt to the other end of the bolt.
  • the bolt 76 need not be threaded.
  • the bolt 76 may be a stopper (not shown in the figures) that is placed into the aperture 320.
  • valve train component comprising the hydraulic lash adjustment apparatus 6 is a rocker arm
  • different valve train components may be provided with such a hydraulic lash adjustment apparatus including other components that move in dependence upon a cam of the valve train, for example, a valve bridge, or a push rod, or static components, for example, a valve train cover.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP16187707.1A 2015-09-25 2016-09-07 Hydraulikspielausgleichselement Active EP3147469B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1516952.7A GB2542600A (en) 2015-09-25 2015-09-25 Hydraulic lash adjuster

Publications (2)

Publication Number Publication Date
EP3147469A1 true EP3147469A1 (de) 2017-03-29
EP3147469B1 EP3147469B1 (de) 2018-08-15

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EP16187707.1A Active EP3147469B1 (de) 2015-09-25 2016-09-07 Hydraulikspielausgleichselement

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EP (1) EP3147469B1 (de)
GB (1) GB2542600A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10711655B1 (en) 2019-10-07 2020-07-14 Caterpillar Inc. Rocker arm assembly having a hydraulic lash adjuster

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002162B (de) * 1954-06-11 1957-02-07 Sulzer Ag Ventilspielausgleichsvorrichtung
DE19502497A1 (de) * 1995-01-27 1996-08-01 Schaeffler Waelzlager Kg Hydraulische Spielausgleichsvorrichtung
DE19935296A1 (de) * 1999-07-27 2000-04-20 Ernst Pfleiderer Gaswechselventile für ventilgesteuerte Hubkolben- Brennkraftmaschinen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3541198A1 (de) * 1985-11-21 1987-05-27 Motomak Hydraulische spielausgleichsvorrichtung
GB2501876A (en) * 2012-05-08 2013-11-13 Eaton Srl Hydraulic lash adjuster

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1002162B (de) * 1954-06-11 1957-02-07 Sulzer Ag Ventilspielausgleichsvorrichtung
DE19502497A1 (de) * 1995-01-27 1996-08-01 Schaeffler Waelzlager Kg Hydraulische Spielausgleichsvorrichtung
DE19935296A1 (de) * 1999-07-27 2000-04-20 Ernst Pfleiderer Gaswechselventile für ventilgesteuerte Hubkolben- Brennkraftmaschinen

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EP3147469B1 (de) 2018-08-15
GB201516952D0 (en) 2015-11-11
GB2542600A (en) 2017-03-29

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