US3658038A - Tappet for overhead camshaft engine - Google Patents

Tappet for overhead camshaft engine Download PDF

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Publication number
US3658038A
US3658038A US103475A US3658038DA US3658038A US 3658038 A US3658038 A US 3658038A US 103475 A US103475 A US 103475A US 3658038D A US3658038D A US 3658038DA US 3658038 A US3658038 A US 3658038A
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United States
Prior art keywords
lifter body
valve lifter
valve
tappet
constricted portion
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.)
Expired - Lifetime
Application number
US103475A
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English (en)
Inventor
Paul F Bergmann
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.)
Johnson Products Inc
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Johnson Products Inc
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Filing date
Publication date
Application filed by Johnson Products Inc filed Critical Johnson Products Inc
Application granted granted Critical
Publication of US3658038A publication Critical patent/US3658038A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem

Definitions

  • a hydraulic valve lifter assembly is interposed directly between a spring biased valve stem and cam, the valve lifter assembly comprising a plunger slidably mounted within a valve lifter body forming a pressurized chamber the body and plunger movable axially within a cylinder head guide.
  • a tubular shaped intermediate member is secured to the valve lifter body by a spring clip, the sides of the member being in slidable engagement with the guide and fitting over the end portion of the valve stem and associated spring.
  • a constricted portion of the tubular member engages the valve body and is detachably connected thereto by the spring clip.
  • a primary object of this invention is to make a tappet-that provides a low cost hydraulic lash adjuster which eliminates a significant amount of the heretofore required high quality material.
  • this invention is comprised of a valve lifter assembly having a plunger slidably mounted within the lifter body for reciprocal movement therewith, the valve lifter body being mounted for axial movement within a cylinder'head, guide but spaced therefrom to provide a significantly smaller lifter body in diameter thereby eliminating the heretofore required high cost lifter body required to fit over and enclose a portion of the valve stem and associated spring.
  • an intermediate tubular shaped member of low cost material is detachably connected to'the valve lifter body by a spring clip means.
  • the tubular member has sides engageable with the guide for guiding movement therebetween and a pair of open ends, one fitting over end 14 of the valve stem.
  • FIG. 1 is a transverse sectional view of an hydraulic valve lifter assembly arranged according to this invention
  • FIG. 2 is a fragmentary sectional view taken along line 11- of FIG. 1;
  • FIG. 3 is a partial side elevational view of the hydraulic valve lifter assembly of FIG. 1
  • FIG. 1 shows an engine assembly 10 including a conventional internal combustion engine having a plurality of cylinders and pistons (not shown) therein to drive a crank shaft (not shown) for power output.
  • the engine includes a cylinder head 11 of conventional construction, having intake and exhaust engine valves 12 for each cylinder, and extending through the head so that the tip 14 of the valve stem protrudes from and above the engine cylinder head.
  • the valve stem rides within the bore provided in the cylinder head and within extended guide bushing 16. It includes a reduced diameter neck 18 around which a generally disc shaped keeper 20 is fitted to retain compression spring 22 between it and the cylinder head. Mounted in the overhead The lifter body and lash adjuster body are slidable relative to each other to provide the tappet adjustment. A retainer ring 46 is mounted in an annular groove 48 on the interior surface of lifter body 42 for retaining the adjuster body within the lifter.
  • Valve lifter body 42 and adjuster 50 are inverted with respect to each other and define a chamber 54 segregated by a plunger 60.
  • Plunger segregates chamber 54 into a fluid pressure chamber 62 formed within the interior of adjuster member 50 below plunger 60 and a reservoir 64 formed within the interior portion of valve lifter body 42 above the adjuster member 50 and plunger 60.
  • Pressure chamber 62 is supplied with engine oil via an oil gallery 66 open to a branch port 68 in communication with reservoir 64 through ports 70 and 72.
  • a plunger passageway 74 permits flow of the engine oil from reservoir 64 to pressure chamber 62 the flow being controlled by a check valve 76 permitting flow of the engine oil in one direction, that is, from the reservoir to the chamber while preventing return flow therethrough.
  • Check valve 76 is biased into a closed position by spring 78, spring 78 being held in compression against valve 76 by a cage 80 held in place against the lower portion of plunger 60 by a spring 82, the spring constant of which considerably exceeds that of spring 78.
  • Valve 76 is also biased toward its closed position when the pressure in chamber 62 exceeds that in the reservoir.
  • Spring 78 and cage 80 limit the opening travel of valve 76 to the amount necessary to accommodate replenishment of pressure chamber 62 with oil which normally escapes therefrom during leakdown. Leakdown will occur during cam induced opening movements of the engine valve causing oil to leak between the sliding surfaces of the plunger 60 and cup-shaped adjuster 50.
  • Cage 80 has a stepped cross section wherein movement of valve 76 is estopped past abutment 84 on the cage.
  • cam lobe 30 provides downward movement of the valve lifter body 42 tending to force the plunger further into the interior of lash adjuster 50.
  • the resulting pressure rise in chamber 62 causes valve 76 to seat preventing reverse flow of the oil through the plunger passageway 74. It is this pressure which provides proper lash adjustment and the only movement of oil out of chamber 62 is leakage between the mating surfaces of the plunger and lash adjuster.
  • the lash ad- 55 juster is likewise moved downwardly under the thrust of the trapped oil in chamber 62 forcing the engine valve to open against its spring 22.
  • valve lifter body 42 On the return stroke, the closed end 44 of valve lifter body 42 is urged against the cam under the baising force of engine valve spring 22 as the cam rotates through its 0 base circle portion 28. This reduces the oil pressure in chamber 62, although engine oil pressure is still present, which with the bias provided by spring 82 urges the plunger back up towards the closed end of lifter body 42, while maintaining abutment of the closed end 52 of lash adjuster 50 against the stem tip 14.
  • the relative movement so provided permits valve 76 to be unseated thereby allowing flow of replenishment oil to chamber 62 as necessary to completely fill it preparatory to the lift operating cycle.
  • the magnitude of relative movement between valve lifter 42 and lash adjuster 50 will vary according to the expansion and contraction of the various parts as a result of wear and tear, or temperature gradients in the engine.
  • valve lifter body 42, lash adjuster 50 and plunger 60 are all comprised of a high quality, high position above the valves and cylinder head is the overhead cost material due to the requisite machining tolerances and sliding movements relative thereto resulting from the constant oscillations required. Also, the parts are of a size that can be run on currently used machinery for high volume manufacturing of hydraulic tappets for push rod type engines. In prior proposals, the cost of these materials were prohibitive or at least deterrent to an overhead valve lifter since the valve lifter body 42 in prior proposals fit over and partially enclosed the end portion of stem spring 22 and associated keeper 20. This requirement is eliminated by the embodiment shown in FIG.
  • valve lifter body As a result thereof, it is no longer required to encapsulate a portion of the valve stem and spring with the valve lifter body resulting in a significant reduction in the diameter of the valve lifter body (as shown in FIG. 1 to be substantially less than the spring diameter) and overall length thereof.
  • an intermediate guide member 90 connected to and positioned intermediate the valve lifter body 42 and cylinder head 11. That portion of cylinder head 11 extending upwards around the tappet includes a cylindrical bore 92 which acts as a guide for the adjusting movement of the tappet.
  • Intermediate member 90 is generally sleeve-like and preferably tubular in shape providing a sliding fit in bore 92, the bore and guide 90 being concentric with the valve stem.
  • the guide extends downward over the end portion of the stem spring 22 and associated keeper to provide lateral support for the valve lifter body to relieve the lifter body, adjuster and plunger of all side thrusts as would otherwise be induced from the cam.
  • guide member 90 is comprised of a generally cylindrical side 94 and extends substantially from the closed end portion 44 of the valve lifter body downwards over the uppermost portion of spring 22 terminating approximately in the vicinity of guide bushing 16.
  • the upper end 95 of guide member 90 is turned inwardly to form a flange whose inner end 96 forms a snug fit with the valve lifter body.
  • a constricted portion 96 Spaced axially downward therefrom, is a constricted portion 96, the depth of which is equal to the distance between the valve lifter body and bore 92.
  • the interior surface 98 of constricted portin 96 forms an annular surface which is in snug contact with valve lifter body 42 and in combination with flange 94 provides a positive annular grip of the valve lifter body at two spaced locus of points.
  • a generally C-shaped spring clip 100 interlocks guide member 90 to the valve lifter body.
  • the ends of the clip are formed into a pair of radially extending ears 102 and 104 which are inserted through the guide member body into the valve lifter body. This is accomplished by providing a pair of diametrically opposed openings 106 and 108 through the interior surface 98 of the guide member to permit insertion of the ears.
  • the valve lifter body includes an annular groove 110 .likewise for receipt of cars 102 and 104.
  • a port 70 is provided through the guide member to permit the passage of oil from gallery 66 through branch 68 on into reservoir 64 through port 72.
  • guide member 90 is comprised of sheet metal rolled to the shape shown from tubing.
  • This type of shaped tubing is significantly inexpensive compared to the high quality material required in the lifter body itself and therefore provides significant savings on a per part basis. Realizing the quantity of tappets used in the automotive industry alone, these savings become extremely advantageous.
  • valve lifter body having a closed end engageable with said cam means; a plunger slidably mounted in said lifter body for reciprocating movement therebetween, said plunger engaging said stem; the improvement comprising:
  • valve lifter body spaced radially from said guide means
  • connector means for connecting said intermediate member to said lifter body.
  • said intermediate member is generally tubular in shape and includes sides in slidable engagement with said guide means and open ends, one of said ends fitting around said valve lifter body, the other end fitting over said spring biased valve stem and associated spring.
  • said means is comprised of a spring clip detachably mounting said intermediate member to said lifter body.
  • valve lifter body opening comprises a groove around the periphery of said body.
  • valve lifter body having a closed end provided for engagement with a cam of an overhead cam shaft
  • a plunger body slidably mounted in said lifter body for reciprocal movement and adapted for engagement with a valve stem;
  • a sleeve-like member secured to and extending about the periphery of said lifter body and adapted for sliding movement in a tappet guide means to provide support for and axial movement of said lifter body in said tappet guide means.
  • said sleeve-like member includes a constricted portion engaged with said valve lifter body.
  • said sleeve-like member includes connector mean detachably securing said sleeve-like member to said valve lifter body.
  • a tappet guiding member comprising a tubular element having a top, bottom and sides; said top having an opening adapted to receive cam engaged self adjusting valve lifter body, said bottom having an opening for receiving a valve stem and valve spring; and means for securing said guiding member to a cam engaged self adjusting valve lifter body received within said opening.
  • the tappet guiding member according to claim 19 wherein said means for securing said guiding member to a valve lifter body is comprised of a generally C-shaped spring having an inturned ear on each end thereof; said constricted portion including a pair of apertures therethrough; said valve lifter body including recessed opening in alignment withsaid apertures; and said inturned ears on said C-shaped spring clip being removably inserted into said apertures to detachably join said tubular member to said valve lifter body.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
US103475A 1971-01-04 1971-01-04 Tappet for overhead camshaft engine Expired - Lifetime US3658038A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10347571A 1971-01-04 1971-01-04

Publications (1)

Publication Number Publication Date
US3658038A true US3658038A (en) 1972-04-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US103475A Expired - Lifetime US3658038A (en) 1971-01-04 1971-01-04 Tappet for overhead camshaft engine

Country Status (7)

Country Link
US (1) US3658038A (enExample)
JP (1) JPS5414687B1 (enExample)
AU (1) AU465559B2 (enExample)
CA (1) CA948942A (enExample)
DE (1) DE2200131C2 (enExample)
FR (1) FR2121239A5 (enExample)
GB (1) GB1354347A (enExample)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862027A (en) * 1972-06-13 1975-01-21 Engelhard Min & Chem Purification of clay by selective flocculation
US3877446A (en) * 1974-08-21 1975-04-15 Gen Motors Corp Hydraulic valve lifter
US4020806A (en) * 1974-12-28 1977-05-03 Nissan Motor Co., Ltd. Hydraulic valve lifter for internal combustion engine
US4098239A (en) * 1975-10-31 1978-07-04 Le Moteur Moderne Valve control device particularly in an overhead camshaft engine
US4241707A (en) * 1974-04-06 1980-12-30 Daimler-Benz Aktiengesellschaft Activating mechanism for the working medium valves of a reciprocating piston engine with hydraulic play compensating elements
EP0030781A1 (en) * 1979-12-05 1981-06-24 Eaton Corporation Hydraulic tappet for direct-acting valve gear
US4279226A (en) * 1978-11-15 1981-07-21 Fiat Auto S.P.A. Hydraulic tappet for an internal combustion engine having an overhead camshaft
FR2476740A1 (fr) * 1980-02-22 1981-08-28 Motomak Poussoir de soupape pour moteurs a combustion interne avec arbre a cames en tete
FR2496931A1 (fr) * 1980-12-22 1982-06-25 Stanadyne Inc Regleur de jeu hydraulique a compensation automatique
US4483281A (en) * 1979-07-09 1984-11-20 Black Alfred A Poppet valve spring retainer with integral hydraulic tappet
US4579094A (en) * 1984-03-31 1986-04-01 Motomak Motorenbau, Maschinen-Und Werkzeugfabrik Konstruktionen Gmbh Cup-shaped casing for a hydraulic tappet
EP0212162A1 (de) * 1985-08-08 1987-03-04 MOTOMAK Motorenbau, Maschinen- und Werkzeugfabrik, Konstruktionen GmbH Sich selbsttätig hydraulisch einstellender Ventilstössel
US4917056A (en) * 1987-09-22 1990-04-17 Honda Giken Kogyo Kabushiki Kaisha Valve operation control system in internal combustion engine
US4924825A (en) * 1984-03-14 1990-05-15 Motomak Motorenbau, Maschinen-Und Werkzeugfabrik, Konstruktionen Gmbh Outer guide means for a valve tappet
US20070272185A1 (en) * 2006-05-24 2007-11-29 Schaeffler Kg Hydraulic lash adjuster for an internal combustion engine

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2829423A1 (de) * 1978-07-05 1980-01-17 Irm Antriebstech Gmbh Tassenstoessel mit hydraulischem ventilspielausgleich
US4367701A (en) * 1979-12-05 1983-01-11 Eaton Corporation Acting valve gear
US4373477A (en) * 1980-12-29 1983-02-15 Eaton Corporation Lash adjuster with plunger retainer
DE4340035B4 (de) * 1992-12-10 2006-02-23 Ina-Schaeffler Kg Mechanischer Tassenstößel
DE4442058A1 (de) * 1994-11-25 1996-05-30 Schaeffler Waelzlager Kg Hydraulisches Spielausgleichselement für eine Ventilsteuerung einer Brennkraftmaschine
DE10105807C1 (de) 2001-02-08 2002-05-08 Hatz Motoren Kipphebel für einen Ventiltrieb eines Verbrennungsmotors mit Vorrichtung zur selbsttätigen Ein-/Nachstellung des Ventilspiels

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1801683A (en) * 1928-04-03 1931-04-21 Noble Warren Hydraulic valve gear
US1910813A (en) * 1929-09-19 1933-05-23 Hudson Motor Car Co Internal combustion engine
US3002509A (en) * 1960-05-02 1961-10-03 Caterpillar Tractor Co Adjustable cam follower with detent retaining means
US3176669A (en) * 1963-03-02 1965-04-06 Motomak G M B H Self-adjusting hydraulic valve lifter for piston engines
US3509858A (en) * 1968-05-20 1970-05-05 Gen Motors Corp Overhead cam valve lifter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2874684A (en) * 1954-01-20 1959-02-24 Earl A Thompson Valve lifter structure
US3053239A (en) * 1961-06-30 1962-09-11 Gen Motors Corp Horizontal hydraulic valve lifter
FR2006542A1 (enExample) * 1968-04-19 1969-12-26 Motomak
DE1914693B2 (de) * 1969-03-22 1978-02-16 Motomak Motorenbau Maschinen- U. Werkzeugfabrik, Konstruktionen Gmbh, 8070 Ingolstadt Ventilstoessel fuer brennkraftmaschinen mit obenliegender nockenwelle
DE1808000A1 (de) * 1968-11-09 1970-05-27 Richard Kuechen Sen Hydraulische,selbsttaetig arbeitende Ventilspielausgleichsvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1801683A (en) * 1928-04-03 1931-04-21 Noble Warren Hydraulic valve gear
US1910813A (en) * 1929-09-19 1933-05-23 Hudson Motor Car Co Internal combustion engine
US3002509A (en) * 1960-05-02 1961-10-03 Caterpillar Tractor Co Adjustable cam follower with detent retaining means
US3176669A (en) * 1963-03-02 1965-04-06 Motomak G M B H Self-adjusting hydraulic valve lifter for piston engines
US3509858A (en) * 1968-05-20 1970-05-05 Gen Motors Corp Overhead cam valve lifter

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862027A (en) * 1972-06-13 1975-01-21 Engelhard Min & Chem Purification of clay by selective flocculation
US4241707A (en) * 1974-04-06 1980-12-30 Daimler-Benz Aktiengesellschaft Activating mechanism for the working medium valves of a reciprocating piston engine with hydraulic play compensating elements
US3877446A (en) * 1974-08-21 1975-04-15 Gen Motors Corp Hydraulic valve lifter
US4020806A (en) * 1974-12-28 1977-05-03 Nissan Motor Co., Ltd. Hydraulic valve lifter for internal combustion engine
US4098239A (en) * 1975-10-31 1978-07-04 Le Moteur Moderne Valve control device particularly in an overhead camshaft engine
US4279226A (en) * 1978-11-15 1981-07-21 Fiat Auto S.P.A. Hydraulic tappet for an internal combustion engine having an overhead camshaft
US4483281A (en) * 1979-07-09 1984-11-20 Black Alfred A Poppet valve spring retainer with integral hydraulic tappet
EP0030781A1 (en) * 1979-12-05 1981-06-24 Eaton Corporation Hydraulic tappet for direct-acting valve gear
FR2476740A1 (fr) * 1980-02-22 1981-08-28 Motomak Poussoir de soupape pour moteurs a combustion interne avec arbre a cames en tete
FR2496931A1 (fr) * 1980-12-22 1982-06-25 Stanadyne Inc Regleur de jeu hydraulique a compensation automatique
US4392462A (en) * 1980-12-22 1983-07-12 Stanadyne, Inc. Inverted bucket tappet with seal
US4924825A (en) * 1984-03-14 1990-05-15 Motomak Motorenbau, Maschinen-Und Werkzeugfabrik, Konstruktionen Gmbh Outer guide means for a valve tappet
US4579094A (en) * 1984-03-31 1986-04-01 Motomak Motorenbau, Maschinen-Und Werkzeugfabrik Konstruktionen Gmbh Cup-shaped casing for a hydraulic tappet
EP0212162A1 (de) * 1985-08-08 1987-03-04 MOTOMAK Motorenbau, Maschinen- und Werkzeugfabrik, Konstruktionen GmbH Sich selbsttätig hydraulisch einstellender Ventilstössel
US4917056A (en) * 1987-09-22 1990-04-17 Honda Giken Kogyo Kabushiki Kaisha Valve operation control system in internal combustion engine
US20070272185A1 (en) * 2006-05-24 2007-11-29 Schaeffler Kg Hydraulic lash adjuster for an internal combustion engine

Also Published As

Publication number Publication date
AU3436471A (en) 1973-04-12
JPS5414687B1 (enExample) 1979-06-08
AU465559B2 (en) 1975-10-02
GB1354347A (en) 1974-06-05
CA948942A (en) 1974-06-11
FR2121239A5 (enExample) 1972-08-18
DE2200131A1 (de) 1972-07-27
DE2200131C2 (de) 1986-10-09

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