US3614942A - Metered mechanical tappet with slotted pushrod seat - Google Patents

Metered mechanical tappet with slotted pushrod seat Download PDF

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Publication number
US3614942A
US3614942A US29915A US2991570A US3614942A US 3614942 A US3614942 A US 3614942A US 29915 A US29915 A US 29915A US 2991570 A US2991570 A US 2991570A US 3614942 A US3614942 A US 3614942A
Authority
US
United States
Prior art keywords
seat
pushrod
slot
tappet
wall
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
US29915A
Other languages
English (en)
Inventor
Ronald R Erickson
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.)
Johnson Products Inc
Original Assignee
Johnson Products 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 Johnson Products Inc filed Critical Johnson Products Inc
Priority to US29915A priority Critical patent/US3614942A/en
Priority to CA102,196A priority patent/CA947165A/en
Priority to DE2100672A priority patent/DE2100672C2/de
Priority to GB2372/71A priority patent/GB1292762A/en
Priority to FR7111175A priority patent/FR2092527A5/fr
Priority to US00149483A priority patent/US3782345A/en
Priority to AU32945/71A priority patent/AU454829B2/en
Application granted granted Critical
Publication of US3614942A publication Critical patent/US3614942A/en
Priority to CA192,707A priority patent/CA963336A/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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • 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
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/104—Lubrication of valve gear or auxiliaries of tappets
    • 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
    • F16H—GEARING
    • F16H53/00—Cams or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/06—Cam-followers

Definitions

  • the invention relates to a mechanical tappet utilizing continuous precision metering without the necessity for a flat disc positioned immediately below the pushrod seat.
  • the invention provides an improved mechanical tappet operatively connected to a pushrod and comprising an oil reservoir, a pushrod seat positioned within a cavity of the tappet, the seat having a central opening communicating with the pushrod and means for metering oil from the reservoir through the seat and into the rod; the improvement comprising the metering means including a slot in one of the surfaces of the seat engaged by the tappet, the slot extending to the reservoir, and a passageway from the slot to the central opening.
  • a related object of the invention is to provide a tappet of the above character which is inexpensive to manufacture.
  • FIG. 1 is a fragmentary, side elevation partially in section of a tappet constructed in accordance with the invention
  • FIG. 2 is a plan view of the retainer utilized in FIG. 1;
  • FIG. 3 is a cross-sectional view of the push-rod seat and tappet body taken along the plane IIIIII of FIG. 1;
  • FIG. 4 is an elevational view, partially in section, illustrating the tappet body only
  • FIG. 5 is a fragmentary side elevational view partially in section similar to FIG. 1 but illustrating an alternate embodiment
  • FIG. 6 is a fragmentary elevational view, partially in section, of still another alternate embodiment of the invention.
  • FIG. 7 is a sectional view of the pushrod seat of the embodiment shown in FIG. 6;
  • FIG. 8 is a plan view of the tappet of FIG. 6 but without the pushrod.
  • FIG. 9 is a cross-sectional view of a modified pushrod seat.
  • the invention relates to an improved mechanical tappet 10 utilized in a conventional engine block having a crankcase 11 and a passageway 12 connecting the tappet 10 to an oil gallery.
  • the tappet includes the tappet body in which is seated a pushrod seat 16 supporting a push-rod 14, the entire combination being reciprocated in a conventional fashion by a cam 18 on camshaft 20.
  • the tappet body 24 is conventionally provided (FIG. 4) with an oil reservoir 22 in the lower part and a groove 30 in the outer part thereof.
  • the upper portion is provided with an enlarged cavity 25 having the following configuration.
  • a shoulder 26 is formed by an annular undercut 50. Spaced above the undercut 50 is still another undercut in the form of a groove 29. The shoulder 26 serves to accommodate and support the seat 16, while the functions of the undercut and the groove are hereinafter described.
  • a metering means 36 is constructed in the pushrod seat 16 so as to not need a flat disc as was utilized in the aforesaid application Ser. No. 853,741.
  • the elimination of this element is made possible by utilizing, in the embodiment illustrated in FIGS. 1-4, a metering slot 40 (see FIG. 3) in the bottom surface of the pushrod seat 16, the slot 40 being positioned within the surface 42 which rests upon the annular shoulder 26.
  • the slot 40 extends radially from the outer wall 17 of the pushrod seat at least to a point at which it is in communication with the oil reservoir 22.
  • a non-metering passageway comprising an annular path between the outer wall 17 of the pushrod seat 16 and the wall of the cavity 25 extending along at least a portion of the outer wall 17 is provided.
  • the annular path comprises the annular undercut 50 in the interior wall of the cavity 25, the undercut extending approximately half-way up the surface of the wall 17.
  • a cross hole 52 is provided within the pushrod seat 16, extending radially from the center opening 27 to the wall 17 and thus communicating with the annular undercut 50.
  • the pushrod seat 16 having the preceding features can be manufactured by any conventional technique, such as by machining a suitable metal blank.
  • the metering slot can be coined to insure proper size.
  • a resilient retainer 60 is pressed into the housing 24 so as to prevent the surface 42 of the pushrod seat from separating from the shoulder in the direction of reciprocation of the tappet. That is, tendency to separate will be caused by lash, and this tendency is prevented by the frictional retention of the retainer 60 within the cavity 25.
  • the retainer 60 comprises a flexible metallic piece which is dish-shaped (FIG. 2) so as to provide an upstanding edge 62 formed by a bend 64.
  • a central hole 66 accommodates the pushrod 14.
  • the groove 29 may be provided within the cavity wall. (See FIG. 4.) However, it has been found that the groove 29 is not essential to the proper retention of the retainer 60.
  • the aforegoing construction allows the pushrod seat 16 to rotate within the cavity 25 with the surface 42 pressed upon the shoulder 26 so as to lessen the tendency of the slot 40 to become plugged. At the same time, this construction prevents any axial movement of the pushrod seat 16 so as to unseat and thereby enlarge the slot 40 allowing too much oil to meter into the cross hole 52 and thence into the pushrod 14.
  • the oil flow to the rocker arm through the pushrod 14 is from the passageway 12, reservoir 22 defined by the tappet body 24, through metering means 36, and thence through the central opening 27 in the pushrod seat to the hole 28 in the bottom of the pushrod 14.
  • the oil in the reservoir 22 is replenished each time the groove 30' of the housing 24 reciprocates past the opening to the passageway 12.
  • FIG. 5 illustrates an alternate embodiment of the invention wherein a different construction is utilized to retain the pushrod seat from axial movement within the tappet. Similar parts which correspond to those utilized in the previous embodiment utilize the same numerals to which the distinguishing sufiix a has been added.
  • a tappet a is operated by a cam 18:: within a crankcase 11a, the oil flowing from a passageway 12a through a reservoir 22a, slot 40a and up into a pushrod 14a.
  • the metering means 36a is identical in all respects with that described in the previous embodiment except that the annular path between the outer wall 17a of the pushrod seat and the inner wall of the cavity 25a is formed by reducing the diameter of the outer wall 17a for almost the entire length of the pushrod seat. Thus, there is no annular undercut in the inner wall of the cavity 25a.
  • the reduced diameter of the outer wall 17a terminates at a point just below the top surface 70 of the pushrod seat, thereby forming an annular lip 72, the outer diameter of which exceeds the diameter of the inner wall of the cavity 25a.
  • FIGS. 6 through 8 illustrate still another embodiment wherein the metering is accomplished by the annular path between the walls of the ushrod seat and the cavity of the tappet, rather than by the slot, so that the slot merely conveys ample oil to the annular path under all conditions of operation of the device.
  • Similar parts which correspond to those utilized in the previous embodiments bear the same reference numerals to which the distinguishing suffix b has been added.
  • a tappet 10b reciprocates within a crankcase 11b, the oil flowing from a passageway 12b, into a reservoir 22b and through a conveying means 3612 into a central opening 27b and thence up into a pushrod 14b by means of the hole 28b therein.
  • the metering in this embodiment is accomplished by the annular path between the wall 17b of the pushrod seat 16b in the wall of the cavity 251), a slot being provided in the bottom of the pushrod seat 16 in the surface which rests upon the annular shoulder 26b solely for the purpose of supplying continuously a flow of oil to the annular path.
  • the radial thickness of the annular path is substantially less than any of the dimensions of the slot 80, the thickness being controlled by strict tolerance requirements on the dimensions of the walls of the pushrod seat and the cavity. The particular dimensions vary with the amount of metering desired, and are readily determinable.
  • FIGS. 6 through 8 also illustrates that the cross hole 52b can extend the full diameter of the pushrod seat so as to provide access to the central opening 27b by two different locations in the annular path. Or, in the alternative, the cross hole 52b need extend only as a radius of the pushrod seat. Further variations are to make the push rod seat in two parts, the lower part being a disk as shown in FIG. 9 with slots 80a, and 52d in opposite side thereof, and the upper part being the seat 17c.
  • Reference numeral 520 designates the parting line between the two parts. This construction permits shallower slots and reduces flow characteristics.
  • a tappet operatively connected to a pushrod and comprising a tappet body having an oil reservoir, a pushrod seat positioned within a cavity of said tappet body and supported by an annular shoulder of said tappet body, means for restraining the pushrod seat against axial movement away from said shoulder, said seat having an opening communicating with said pushrod, and means for metering oil from said reservoir through said seat and into the rod; the improvement comprising said metering means including a slot in one of the engaging surfaces of said seat and said tappet body, said slot extending at least to said reservoir, and a passageway from said slot to said central opening.
  • said passageway includes an annular path between at least a portion of the outer wall of said seat and the concentric wall of said tappet body, and said slot extends from the outer diameter of said seat wall at least to a point in communication with said reservoir.
  • said restraining means includes an annular lip on said seat and having an outer diameter which exceeds the diameter of the wall of said cavity, whereby said seat is prevented from moving axially away from said shoulder.
  • said restraining means includes an annular resilient dish-shaped retainer pressed between said seat and said cavity wall.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
US29915A 1970-04-20 1970-04-20 Metered mechanical tappet with slotted pushrod seat Expired - Lifetime US3614942A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US29915A US3614942A (en) 1970-04-20 1970-04-20 Metered mechanical tappet with slotted pushrod seat
CA102,196A CA947165A (en) 1970-04-20 1971-01-07 Metered mechanical tappet with slotted push rod seat
DE2100672A DE2100672C2 (de) 1970-04-20 1971-01-08 Becherförmiger mechanischer Stößel mit einer Ölzumeßeinrichtung für die Stößelstange
GB2372/71A GB1292762A (en) 1970-04-20 1971-01-18 Mechanical tappet for metering an oil flow to a push-rod
FR7111175A FR2092527A5 (enExample) 1970-04-20 1971-03-30
US00149483A US3782345A (en) 1970-04-20 1971-06-03 Metered mechanical tappet with slotted push rod seat
AU32945/71A AU454829B2 (en) 1970-04-20 1971-09-01 Metered mechanical tappet with slotted pushrod seat
CA192,707A CA963336A (en) 1970-04-20 1974-02-15 Metered mechanical tappet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29915A US3614942A (en) 1970-04-20 1970-04-20 Metered mechanical tappet with slotted pushrod seat
AU32945/71A AU454829B2 (en) 1970-04-20 1971-09-01 Metered mechanical tappet with slotted pushrod seat

Publications (1)

Publication Number Publication Date
US3614942A true US3614942A (en) 1971-10-26

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Family Applications (2)

Application Number Title Priority Date Filing Date
US29915A Expired - Lifetime US3614942A (en) 1970-04-20 1970-04-20 Metered mechanical tappet with slotted pushrod seat
US00149483A Expired - Lifetime US3782345A (en) 1970-04-20 1971-06-03 Metered mechanical tappet with slotted push rod seat

Family Applications After (1)

Application Number Title Priority Date Filing Date
US00149483A Expired - Lifetime US3782345A (en) 1970-04-20 1971-06-03 Metered mechanical tappet with slotted push rod seat

Country Status (6)

Country Link
US (2) US3614942A (enExample)
AU (1) AU454829B2 (enExample)
CA (2) CA947165A (enExample)
DE (1) DE2100672C2 (enExample)
FR (1) FR2092527A5 (enExample)
GB (1) GB1292762A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717134A (en) * 1971-09-13 1973-02-20 Johnson Products Inc Tappet push rod seat and meter means
US3799129A (en) * 1972-11-06 1974-03-26 Johnson Products Inc Hydraulic lash adjuster oil metering means
US4083334A (en) * 1973-04-26 1978-04-11 Carlos Alberto Ferrari Roncon Hydraulic valve lifter

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227495A (en) * 1978-09-21 1980-10-14 Eaton Corporation Hydraulic lash adjuster with oil reservoir separator
US4739675A (en) * 1980-11-14 1988-04-26 Connell Calvin C Cylindrical tappet
US4601268A (en) * 1984-02-27 1986-07-22 Rhoads Gary E Variable two-way bleed valve
US7028654B2 (en) 2002-10-18 2006-04-18 The Maclean-Fogg Company Metering socket
US6871622B2 (en) 2002-10-18 2005-03-29 Maclean-Fogg Company Leakdown plunger
US7128034B2 (en) * 2002-10-18 2006-10-31 Maclean-Fogg Company Valve lifter body
US7191745B2 (en) 2002-10-18 2007-03-20 Maclean-Fogg Company Valve operating assembly
US7273026B2 (en) * 2002-10-18 2007-09-25 Maclean-Fogg Company Roller follower body
DE102008000824A1 (de) * 2008-03-26 2009-10-01 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB214537A (en) * 1923-08-31 1924-04-24 Gustave Maurice Maclure Improvements relating to the lubrication of internal combustion engines
US2874685A (en) * 1955-08-26 1959-02-24 Eaton Mfg Co Hydraulic valve lifter
US2865352A (en) * 1955-12-05 1958-12-23 Earl A Thompson Tappet construction
US3280807A (en) * 1965-10-28 1966-10-25 Lubrizol Corp Metering valve for hydraulic valve lifter
GB1080513A (en) * 1966-07-12 1967-08-23 Brico Eng Tappets
US3448730A (en) * 1967-06-07 1969-06-10 Eaton Yale & Towne Hydraulic valve lifter
US3477416A (en) * 1967-09-27 1969-11-11 Eaton Yale & Towne Hydraulic lifter
US3476093A (en) * 1967-10-10 1969-11-04 Eaton Yale & Towne Hydraulic valve lifter
US3437080A (en) * 1967-11-13 1969-04-08 Eaton Yale & Towne Valve tappet
US3598095A (en) * 1969-10-02 1971-08-10 Eaton Yale & Towne Hydraulic valve lifter with temperature compensating lubricant metering means
US3630179A (en) * 1970-04-20 1971-12-28 Johnson Products Inc Metered mechanical tappet
US3636932A (en) * 1970-05-18 1972-01-25 Stanadyne Inc Tappet with means for relieving entrained air

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717134A (en) * 1971-09-13 1973-02-20 Johnson Products Inc Tappet push rod seat and meter means
US3799129A (en) * 1972-11-06 1974-03-26 Johnson Products Inc Hydraulic lash adjuster oil metering means
US4083334A (en) * 1973-04-26 1978-04-11 Carlos Alberto Ferrari Roncon Hydraulic valve lifter

Also Published As

Publication number Publication date
CA963336A (en) 1975-02-25
US3782345A (en) 1974-01-01
DE2100672C2 (de) 1983-08-25
CA947165A (en) 1974-05-14
DE2100672A1 (de) 1971-11-11
AU454829B2 (en) 1974-10-24
FR2092527A5 (enExample) 1972-01-21
GB1292762A (en) 1972-10-11
AU3294571A (en) 1973-03-08

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