US3661127A - Hydraulic tappet with swivelably mounted pushrod - Google Patents

Hydraulic tappet with swivelably mounted pushrod Download PDF

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Publication number
US3661127A
US3661127A US35527A US3661127DA US3661127A US 3661127 A US3661127 A US 3661127A US 35527 A US35527 A US 35527A US 3661127D A US3661127D A US 3661127DA US 3661127 A US3661127 A US 3661127A
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US
United States
Prior art keywords
push rod
tappet
rocker arm
plunger
adjacent
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
US35527A
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English (en)
Inventor
Richard D Cornell
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.)
Sealed Power Technologies LP
Kodiak Partners Corp
Johnson Products Inc
Original Assignee
Johnson Products Inc
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Publication of US3661127A publication Critical patent/US3661127A/en
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Assigned to SPX CORPORATION, A CORP. OF DE. reassignment SPX CORPORATION, A CORP. OF DE. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SEALED POWER CORPORATION, A CORP. OF DE. (CHANGED TO), SPAR CORPORATION, A CORP. OF DE (MERGED INTO)
Assigned to KODIAK PARTNERS CORP., A CORP. OF DE reassignment KODIAK PARTNERS CORP., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SPX CORPORATION, A DE CORP.
Assigned to CHEMICAL BANK reassignment CHEMICAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SEALED POWER, TECHNOLOGIES, L.P., A DE LIMITED PARTNERSHIP
Assigned to CHEMICAL BANK, A NEW YORK BANKING CORP., AS AGENT reassignment CHEMICAL BANK, A NEW YORK BANKING CORP., AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SEALED POWER TECHNOLOGIES, L.P.
Assigned to SEALED POWER TECHNOLOGIES, L.P. reassignment SEALED POWER TECHNOLOGIES, L.P. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KODIAK PPARTNERS CORP.
Assigned to SEALED POWER TECHNOLOGIES, L.P. reassignment SEALED POWER TECHNOLOGIES, L.P. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 6/20/89, DE Assignors: SEALED POWER TECHNOLOGIES, L.P.
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
    • F01L1/255—Hydraulic tappets between cam and rocker arm

Definitions

  • the tappet is mounted for reciprocation.
  • the arcuate moving push rod socket will accommodate the push rod of a reciprocating hydraulic tappet.
  • These swivel connections provide means for compensating for the axial misalignment of the tappet with respect to the push rod socket in the different positions of the rocker arm along its arcuate path.
  • my invention provides a tappet which can be utilized by an overhead cam engine in such a fashion that the tappet connection between the rocker arm and the tappet accommodates the rocking action of the rocker arm.
  • an object of this invention is to make possible the use of hydraulic tappets in overhead cam engines without experiencing difficulties in misalignment between the tappet and the rocker arm, such difficulties heretofore having created serious problems which practically eliminated the possibility of using hydraulic tappets with overhead cam engines.
  • Still other objects of this invention are to provide such a hydraulic tappet in which conventional components, such as those disclosed in previous patents referred to in this application, can be utilized with only minimum changes in such components as will be evidenced from the following description.
  • FIG. 1 is a fragmentary sectional view illustrating the engine valve train assembly utilizing the invention.
  • FIG. 2 is a side elevational, cross sectional view of the hydraulic tappet constructed in accordance with the invention.
  • the valve train for such an engine conventionally features cam shaft 10 having a cam 10a positioned in'the immediate vicinity of the rocker arm 12 which is pivotally mounted on a post 14 by means of the rocker arm support 15.
  • a tappet 30 is provide to actuate the rocker arm so as to actuate engine valve stem 16.
  • the tappet 30 is conventionally provided with oil under pressure by a galley passageway 18 which is common to each tappet for each valve.
  • the tappet 30 is so arranged (not specifically shown) so that the oil in galley 18 in certain positions of the tappet flows through passageway 36 (FIG.
  • the hydraulic tappet 30 comprises a tappet body 32 having a surface which is recessed at 34 to accommodate oil delivered by the passageway 18, the oil passing into the tappet body via orifice 36.
  • a plunger 38 is reciprocatingly positioned within the tappet body 32, the plunger 38 being conventionally provided with a second orifice 40 and a recessed surface 42 which cooperates with an internal annular groove 44 on the tappet body 32 and the orifices 36 and 40 to pass oil into the interior cavity 46 of the plunger 38 as herebefore disclosed.
  • the plunger is also conventionally provided with an open upper end and a generally closed lower end except for a coaxial passageway 48 governed by a check valve assembly comprising a spring 50 and plate 52, Another coil spring 54 urges a retainer cap 56 and therefore the plunger 38 toward the open end of the hollow tappet body 32 in a conventional fashion.
  • a rocker arm seat assembly including the push rod seat 62 and the push rod 82, both of which have the passageways 64 and 89. respectively, for passage of oil to the rocker arm 12 from the reservoir 46.
  • the metering means 60 of the hydraulic tappet which as shown is similar to that disclosed in U.S. Pat. No. Re. 25,974.
  • This particular metering means includes a specially designed nose portion 66 of the push rod seat 62 and an annular ridge 70 seated upon a metering disc 72 which has apertures 74 therein for allowing oil to pass from the reservoir 46 to the passageway 64.
  • a push rod 82 is slidably mounted upon the surface 68 so as to provide a pivotal connection between tappet 30 and the rocker arm 12.
  • the surface 68 of the push rod seat 62 is spherically shaped to accommodate the spherical end 87 of the push rod 82.
  • the opposite end 84 of the push rod is provided with a spherical surface which as shown has a radius of curvature considerably less than that of the surface for the end 82, the end 84 being designed to fit into the socket 86 of the rocker arm 12.
  • the end 87 is characterized by flanges 88 which project out almost to the width of the push rod seat 62 so as to engage, prior to the assembly of the tappet, a retainer ring 90 which is permanently confined within the tappet.
  • the retainer ring serves to prevent separation of the rocker arm seat 80 from the metering socket 62 before assembly.
  • rocker arm seat 80 An important characteristic of the rocker arm seat 80 is its short length combined with the pivotal action of the push rod.
  • the length of seat 80 is considerably shorter or smaller than the length of the remainder of the tappet 30 which allows the tappet 30 to fit into the very confined space between the cam l and the rocker arm 12 while at the same time permitting the necessary swivel-like movement which accommodates the are prescribed by the rocker arm.
  • the rocker arm seat 80 forces the rocker arm to rock to the position shown in solid lines in F IG. 1.
  • the center point 92 of the socket 86 of the rocker arm 12 has departed from the axis of the tappet 30 by a small amount due to the rocking of the arm 12 through the angle alpha".
  • This small amount requires that the push rod 82 swivel or pivot by sliding on the surface 68 to accommodate the temporary misalignment of the point 92 with the axis of the tappet.
  • spherical end 84 swivels within the spherical surface 86 of the rocker arm.
  • any back lash in the valve train is taken up by the hydraulic tappet in a well-known fashion. That is, the oil pressure in reservoir 46, supplied from galley l8 through passages 36 and 40, extends the plunger 38, if required, by passing through valve plate 52 into the chamber below the plunger thus applying a force thereto to extend the plunger 38 so as to hold the push rod 82 in constant contact with the rocker arm.
  • the plunger can be distended by passing the oil contained in the chamber below plunger 38 around the plunger in the space between the plunger 38 and body 32 and back to reservoir 46, such action occurring when sufficient force is supplied to the end of push rod 82 due to heat expansion or the like of the valve train.
  • a tappet for use with an overhead cam engine having a rocker arm with a push rod socket adapted for movement along an arcuate path comprising: a tappet body having a bore with an open end; a plunger mounted for reciprocal sliding movement in the bore of said body; a push rod seat mounted on said plunger adjacent the open end of said body; and a push rod of reduced length swivelably associated with the push rod seat at one end and at the other end having means adapted for swivel association with the push rod socket of said rocker arm; said swivel associations providing means for compensating for the axial misalignment of the tappet with respect to the push rod socket in different positions thereof along said arcuate path, said push rod being spherical in shape on each end and the end adjacent the push rod seat being larger than the opposite end adjacent said rocker arm 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
US35527A 1970-05-07 1970-05-07 Hydraulic tappet with swivelably mounted pushrod Expired - Lifetime US3661127A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3552770A 1970-05-07 1970-05-07

Publications (1)

Publication Number Publication Date
US3661127A true US3661127A (en) 1972-05-09

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ID=21883258

Family Applications (1)

Application Number Title Priority Date Filing Date
US35527A Expired - Lifetime US3661127A (en) 1970-05-07 1970-05-07 Hydraulic tappet with swivelably mounted pushrod

Country Status (5)

Country Link
US (1) US3661127A (enExample)
CA (1) CA924981A (enExample)
DE (1) DE2100671A1 (enExample)
FR (1) FR2091318A5 (enExample)
GB (1) GB1275531A (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880127A (en) * 1972-12-07 1975-04-29 Eaton Corp Hydraulic valve gear
US5445118A (en) * 1994-04-22 1995-08-29 Brunswick Corporation Valve train assembly for internal combustion engine
US5720246A (en) * 1996-07-23 1998-02-24 Minnesota Mining And Manufacturing Continuous fiber reinforced aluminum matrix composite pushrod
US20020162524A1 (en) * 1998-09-09 2002-11-07 Ojeda William De Unit trigger actuator
US20060254542A1 (en) * 2005-05-10 2006-11-16 Strickler Scott L Hydraulic valve actuation system with valve lash adjustment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2578907B1 (fr) * 1985-03-13 1989-06-16 Peugeot Dispositif d'actionnement de soupapes dans un moteur a combustion interne comportant quatre soupapes inclinees en v et une bougie centrale par cylindre

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1335515A (en) * 1920-03-30 Internal-combustion engine
US1521623A (en) * 1920-02-09 1925-01-06 J I Case Plow Works Company Valve mechanism
US1798938A (en) * 1927-04-25 1931-03-31 Gen Motors Res Corp Hydraulic slack adjuster
US2665669A (en) * 1948-06-11 1954-01-12 Gen Motors Corp Hydraulic lash adjuster
US2858817A (en) * 1957-02-04 1958-11-04 Eaton Mfg Co Tappet mechanism
US2944536A (en) * 1958-05-30 1960-07-12 Austin Motor Co Ltd Overhead valve internal combustion engines
US3272190A (en) * 1965-07-21 1966-09-13 Jr Vincent J Di Matteo Tapered push rod
US3302628A (en) * 1965-01-20 1967-02-07 Gen Motors Corp Internal combustion engine valve gear
US3531234A (en) * 1967-07-19 1970-09-29 Citroen Sa Andre Camshaft valve gear for engine cylinder head

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1335515A (en) * 1920-03-30 Internal-combustion engine
US1521623A (en) * 1920-02-09 1925-01-06 J I Case Plow Works Company Valve mechanism
US1798938A (en) * 1927-04-25 1931-03-31 Gen Motors Res Corp Hydraulic slack adjuster
US2665669A (en) * 1948-06-11 1954-01-12 Gen Motors Corp Hydraulic lash adjuster
US2858817A (en) * 1957-02-04 1958-11-04 Eaton Mfg Co Tappet mechanism
US2944536A (en) * 1958-05-30 1960-07-12 Austin Motor Co Ltd Overhead valve internal combustion engines
US3302628A (en) * 1965-01-20 1967-02-07 Gen Motors Corp Internal combustion engine valve gear
US3272190A (en) * 1965-07-21 1966-09-13 Jr Vincent J Di Matteo Tapered push rod
US3531234A (en) * 1967-07-19 1970-09-29 Citroen Sa Andre Camshaft valve gear for engine cylinder head

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880127A (en) * 1972-12-07 1975-04-29 Eaton Corp Hydraulic valve gear
US5445118A (en) * 1994-04-22 1995-08-29 Brunswick Corporation Valve train assembly for internal combustion engine
US5720246A (en) * 1996-07-23 1998-02-24 Minnesota Mining And Manufacturing Continuous fiber reinforced aluminum matrix composite pushrod
US20020162524A1 (en) * 1998-09-09 2002-11-07 Ojeda William De Unit trigger actuator
US6786186B2 (en) * 1998-09-09 2004-09-07 International Engine Intellectual Property Company, Llc Unit trigger actuator
US20060254542A1 (en) * 2005-05-10 2006-11-16 Strickler Scott L Hydraulic valve actuation system with valve lash adjustment
US7347172B2 (en) 2005-05-10 2008-03-25 International Engine Intellectual Property Company, Llc Hydraulic valve actuation system with valve lash adjustment

Also Published As

Publication number Publication date
CA924981A (en) 1973-04-24
DE2100671A1 (de) 1971-11-25
GB1275531A (en) 1972-05-24
FR2091318A5 (enExample) 1972-01-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SPX CORPORATION, A CORP. OF DE.

Free format text: MERGER;ASSIGNORS:SPAR CORPORATION, A CORP. OF DE (MERGED INTO);SEALED POWER CORPORATION, A CORP. OFDE. (CHANGED TO);REEL/FRAME:005164/0083

Effective date: 19880425

AS Assignment

Owner name: KODIAK PARTNERS CORP., A CORP. OF DE, MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SPX CORPORATION, A DE CORP.;REEL/FRAME:005125/0002

Effective date: 19890525

AS Assignment

Owner name: CHEMICAL BANK, NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:SEALED POWER, TECHNOLOGIES, L.P., A DE LIMITED PARTNERSHIP;REEL/FRAME:005094/0360

Effective date: 19890530

AS Assignment

Owner name: CHEMICAL BANK, A NEW YORK BANKING CORP., AS AGENT

Free format text: SECURITY INTEREST;ASSIGNOR:SEALED POWER TECHNOLOGIES, L.P.;REEL/FRAME:005106/0271

Effective date: 19890530

AS Assignment

Owner name: SEALED POWER TECHNOLOGIES, L.P., MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KODIAK PPARTNERS CORP.;REEL/FRAME:005208/0100

Effective date: 19890525

AS Assignment

Owner name: SEALED POWER TECHNOLOGIES, L.P.

Free format text: CHANGE OF NAME;ASSIGNOR:SEALED POWER TECHNOLOGIES, L.P.;REEL/FRAME:005134/0125

Effective date: 19890607