US3877445A - Hydraulic tappet oil metering means - Google Patents

Hydraulic tappet oil metering means Download PDF

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Publication number
US3877445A
US3877445A US41694073A US3877445A US 3877445 A US3877445 A US 3877445A US 41694073 A US41694073 A US 41694073A US 3877445 A US3877445 A US 3877445A
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Prior art keywords
oil
plunger
metering
cap
surface
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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
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William I Barnes
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Precision Engine Products Corp
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Stanadyne Inc
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20Adjusting or compensating clearance
    • F01L1/22Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245Hydraulic tappets
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10Lubrication of valve gear or auxiliaries
    • F01M9/104Lubrication of valve gear or auxiliaries of tappets
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7287Liquid level responsive or maintaining systems
    • Y10T137/7358By float controlled valve
    • Y10T137/7423Rectilinearly traveling float
    • Y10T137/7426Float co-axial with valve or port
    • Y10T137/7436Float rigid with valve

Abstract

A hydraulic tappet has a body and a reciprocal plunger within the body. The plunger has an internal oil chamber in communication with the exterior of the tappet body. A floating metering element is positioned within the plunger chamber and has a surface which cooperates with a mating surface on the plunger cap to meter oil from the chamber to the outer surface of the plunger cap.

Description

United States Patent [1 1 Barnes 51 Apr. 15, 1975 1 1 HYDRAULIC TAPPET OIL METERING MEANS i 21 Appl. No.: 416,940

[52] US. Cl. 123/90.35; 123/9046; 123/9055;

137/433 [51] Int. Cl. F0lm 1/06 [58] Field of Search 123/9035, 90.46, 90.55, 123/9056, 90.57; 137/202, 433

[56] References Cited UNITED STATES PATENTS 2,356,900 8/1944 Voorhies 123/9056 2,434,386 1/1948 Bradshaw 123/9046 2,818,050 12/1957 Papenguth 123/9035 2,840,063 6/1958 Purchas 123/9055 3,029,832 4/1962 Tischler 137/433 3,054,392 9/1962 Thompson.... 123/9035 3,194,439 7/1965 Bcduerftig 137/433 3,273,514 9/1966 Bender 137/433 3,379,180 4/1968 Kabel 123/9035 7/1969 Stork 137/433 3,490,423 1/1970 Shunta.... 123/9055 3,528,451 9/1970 Hansen 137/433 3,662,725 5/1972 Dragon 137/202 3,665,156 5/1972 Lee 137/202 3,799,186 3/1974 Bulin 137/433 FOREIGN PATENTS OR APPLICATIONS 1,051,998 11/1966 United Kingdom 123/9035 903,983 8/1962 United Kingdom 123/9055 Primary Examiner-Manuel A. Antonakas Assistant Examiner-Danie1 J. OConnor Attorney, Agent, or Firm1(inzer, Plyer, Dorn & McEachran [57] ABSTRACT 6 Claims, 2 Drawing Figures HYDRAULIC TAPPET OIL METERING MEANS SUMMARY OF THE INVENTION The present invention relates to improvements in hydraulic tappets and in particular to an improved metering element for use therein.

A primary purpose is a hydraulic tappet of the type described having a floating metering element within the pressurized oil chamber.

Another purpose is a hydraulic tappet of the type described in which a spherical ball having a specific gravity less than that of the oil within the chamber is used to provide the metering means from the pressurized oil chamber.

Other purposes will appear in the ensuing specification, drawings and claims.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated diagrammatically in the following drawings wherein:

FIG. 1 is an axial section through a hydraulic tappet, and

FIG. 2 is a bottom view of the plunger cap.

DESCRIPTION OF THE PREFERRED EMBODIMENT A generally cylindrical tappet body is indicated at and may have an interior bore 12 terminating in an open end 14. Positioned within the bore 14 is a plunger 16 having a plunger cap 18. Within the plunger is a pressurized oil chamber 20. The plunger reciprocates relative to the tappet body and is held within the bore 12 by means of a snap ring or the like 22 positioned within a groove 24 adjacent the open end 14.

A plunger return spring 26 is seated upon a surface 28 formed at the closed end of the bore 12 and bears against a portion of a retainer 30 which, through a small spring 32, holds a valve element 34 against the open end 36 of the plunger 16. The above-described construction may be conventional and is generally shown in my prior US. Pat. No. 3,430,613.

The exterior of the tappet body 10 may have a groove 38 which, through a passage 40, communicates with a groove 42 on the interior surface of the tappet body. A mating groove 44 is formed on the exterior of the plunger and communicates with the pressurized oil chamber through a passage 46. Thus, oil passage means are formed between the exterior of the tappet body and the interior of the tappet plunger to pass oil from the engine oil gallery to chamber 20. The abovedescribed structure is conventional in hydraulic tappets.

Positioned within the chamber 20 is a floating metering element 48, having a specific gravity less than that of the oil which is normally within the chamber 20, and which will flow through the chamber as a part of the normal operation of the tappet. The lower surface of cap 18 may be conical, as indicated at 50, so that the ball 48 may be substantially in mating sealing contact therewith. A groove 52 is formed in surface 50, as shown particularly in FIG. 2. The groove is in communication with the chamber 20 and with a plunger cap oil orifice 54 which is in communication with a rounded surface or socket S6 at the top of the plunger cap 18. Normally, a portion of the engine push rod will be seated within the socket 56 and thus oil passing through the orifice 54 will be effective to lubricate the push rod and through it the rocker arm.

The tappet will generally function in the conventional manner. The plunger will receive oil from the body through the grooves and passages to fill and pressurize chamber 20. The oil within chamber 20 will cause the ball 48 to float upon its upper surface and be maintained in contact with the mating sealing surface 50 at all times during operation of the tappet. Oil will be provided at orifice 54 to lubricate the push rod and rocker arm through groove 52, the cross section of which can be closely controlled to provide exact metering of the oil. Thus, ball 48, having a specific gravity less than that of the oil, will float upon the oil within the chamber and the level of the oil within the chamber will be such that the ball will always be in contact with conical surface 50, thus forming a seal about the orifice 54, except for groove 52.

The invention should not be limited to a spherical member as the floating metering element. Other shapes may be equally satisfactory. However, with a spherical member, i.e., a ball, the surface 50 will generally be conical. What is important is to provide a floating element, which can seal against a mating surface, except for a defined passageway, the groove 52 as shown in the drawing.

The ball may be formed of a suitable plastic, and it may be either hollow or solid, depending upon the specific gravity of the plastic. The material forming the ball must be such that it can easily withstand the normal engine oil temperatures and pressures without deforming and/or disintegrating.

Although the application has been described in connection with hydraulic tappets, it should be obvious that the oil metering method shown is equally applicable to mechanical tappets.

In addition, the invention should not be limited to the particular manner shown for providing an oil groove on the undersurface of the plunger cap. Other means may be equally satisfactory for providing an oil passage between the floating metering element and the undersurface of the plunger cap.

Whereas the preferred form of the invention has been shown and described herein, it should be realized that there may be many modifications, substitutions and alterations thereto.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. In a tappet, a tappet body having a bore therein, a hollow plunger reciprocally mounted in said body bore, an oil chamber within said hollow plunger, cooperating oil passage means between the exterior of said body and said oil chamber, spring means positioned in said bore normally urging said plunger outwardly therefrom,

said plunger having a plunger cap and an oil orifice in said plunger cap communicating with said chamher, and a floating totally unconfined metering element in said chamber, the specific gravity of the floating metering element being less than the spe cific gravity of oil, cooperating metering means on said element and plunger cap for controlling the flow of oil through said orifice.

2. The structure of claim 1 further characterized in that the inner surface of said plunger cap and said floating metering element have cooperating surfaces,

formed to effect a seal therebetween except for a predetermined defined area.

3. The structure of claim 2 further characterized in that said predetermined defined area is formed by a groove in the inner surface of said cap.

4. The structure of claim 3 further characterized in that said metering element is generally spherical in shape.

5. The structure of claim 4 further characterized in that the inner surface of said cap facing said metering element is generally conical in configuration.

plunger cap surface.

Claims (6)

1. In a tappet, a tappet body having a bore therein, a hollow plunger reciprocally mounted in said body bore, an oil chamber within said hollow plunger, cooperating oil passage means between the exterior of said body and said oil chamber, spring means positioned in said bore normally urging said plunger outwardly therefrom, said plunger having a plunger cap and an oil orifice in said plunger cap communicating with said chamber, and a floating totally unconfined metering element in said chamber, the specific gravity of the floating metering element being less than the specific gravity of oil, cooperating metering means on said element and plunger cap for controlling the flow of oil through said orifice.
2. The structure of claim 1 further characterized in that the inner surface of said plunger cap and said floating metering element have cooperating surfaces, formed to effect a seal therebetween except for a predetermined defined area.
3. The structure of claim 2 further characterized in that said predetermined defined area is formed by a groove in the inner surface of said cap.
4. The structure of claim 3 further characterized in that said metering Element is generally spherical in shape.
5. The structure of claim 4 further characterized in that the inner surface of said cap facing said metering element is generally conical in configuration.
6. The structure of claim 1 further characterized in that said floating metering element has a curved surface, the surface of said plunger cap facing said metering element having a portion formed to mate with the curved surface of the metering element, and a groove in said mating cap surface, in communication with said orifice, to control the flow of oil to the orifice when the floating metering element has mated against the plunger cap surface.
US3877445A 1973-11-19 1973-11-19 Hydraulic tappet oil metering means Expired - Lifetime US3877445A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4438739A (en) * 1980-03-06 1984-03-27 Aisin Seiki Kabushiki Kaisha Hydraulic lash adjuster
US4481913A (en) * 1982-12-20 1984-11-13 General Motors Corporation Hydraulic lash adjuster oil metering ball valve
US5509385A (en) * 1995-06-15 1996-04-23 Precision Engine Products Corp. Hydraulic lash adjuster metering valve
US5622147A (en) * 1996-03-08 1997-04-22 Eaton Corporation Hydraulic lash adjuster
US20040074462A1 (en) * 2002-10-18 2004-04-22 Dhruva Mandal Lash adjuster body
US20040154571A1 (en) * 2002-10-18 2004-08-12 Dhruva Mandal Roller Follower assembly
US20050183686A1 (en) * 2004-02-25 2005-08-25 Hiroki Fujii Hydraulic lash adjuster
US20060180110A1 (en) * 2005-02-14 2006-08-17 Ina-Schaeffler Kg Hydraulic lash adjuster
CN100464097C (en) 2005-10-31 2009-02-25 汉拏空调株式会社 Expansion valve for rear seat air conditioner

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2356900A (en) * 1942-06-15 1944-08-29 Eaton Mfg Co Tappet construction
US2434386A (en) * 1945-11-26 1948-01-13 Jess H Bradshaw Valve silencer
US2818050A (en) * 1954-06-02 1957-12-31 Gen Motors Corp Lubricating system
US2840063A (en) * 1955-06-17 1958-06-24 Gen Motors Corp Hydraulic valve lifter
US3029832A (en) * 1958-08-27 1962-04-17 Union Tank Car Co Brine tank valve
US3054392A (en) * 1960-03-24 1962-09-18 Earl A Thompson Metering valve
US3194439A (en) * 1963-09-05 1965-07-13 Herman F Beduerftig Vortex cavity seal float
US3273514A (en) * 1965-06-17 1966-09-20 Lloyd F Bender Fluid conveying apparatus
US3379180A (en) * 1967-06-06 1968-04-23 Gen Motors Corp Hydraulic valve lifter
US3455346A (en) * 1966-06-23 1969-07-15 Atlas Copco Ab Fuel supply apparatus
US3490423A (en) * 1968-06-20 1970-01-20 Gen Motors Corp Variable stroke hydraulic valve lifter
US3528451A (en) * 1967-12-18 1970-09-15 Hansen Machine Co Liquid level regulating device
US3662725A (en) * 1970-08-26 1972-05-16 Motorola Inc Evaporation emission control device for fuel tanks
US3665156A (en) * 1970-09-08 1972-05-23 Herbert P Lee Heating-element protector for electric water-heater
US3799186A (en) * 1972-12-26 1974-03-26 Case Co J I Drain tube valve

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2356900A (en) * 1942-06-15 1944-08-29 Eaton Mfg Co Tappet construction
US2434386A (en) * 1945-11-26 1948-01-13 Jess H Bradshaw Valve silencer
US2818050A (en) * 1954-06-02 1957-12-31 Gen Motors Corp Lubricating system
US2840063A (en) * 1955-06-17 1958-06-24 Gen Motors Corp Hydraulic valve lifter
US3029832A (en) * 1958-08-27 1962-04-17 Union Tank Car Co Brine tank valve
US3054392A (en) * 1960-03-24 1962-09-18 Earl A Thompson Metering valve
US3194439A (en) * 1963-09-05 1965-07-13 Herman F Beduerftig Vortex cavity seal float
US3273514A (en) * 1965-06-17 1966-09-20 Lloyd F Bender Fluid conveying apparatus
US3455346A (en) * 1966-06-23 1969-07-15 Atlas Copco Ab Fuel supply apparatus
US3379180A (en) * 1967-06-06 1968-04-23 Gen Motors Corp Hydraulic valve lifter
US3528451A (en) * 1967-12-18 1970-09-15 Hansen Machine Co Liquid level regulating device
US3490423A (en) * 1968-06-20 1970-01-20 Gen Motors Corp Variable stroke hydraulic valve lifter
US3662725A (en) * 1970-08-26 1972-05-16 Motorola Inc Evaporation emission control device for fuel tanks
US3665156A (en) * 1970-09-08 1972-05-23 Herbert P Lee Heating-element protector for electric water-heater
US3799186A (en) * 1972-12-26 1974-03-26 Case Co J I Drain tube valve

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4438739A (en) * 1980-03-06 1984-03-27 Aisin Seiki Kabushiki Kaisha Hydraulic lash adjuster
US4481913A (en) * 1982-12-20 1984-11-13 General Motors Corporation Hydraulic lash adjuster oil metering ball valve
US5509385A (en) * 1995-06-15 1996-04-23 Precision Engine Products Corp. Hydraulic lash adjuster metering valve
US5622147A (en) * 1996-03-08 1997-04-22 Eaton Corporation Hydraulic lash adjuster
US20040074462A1 (en) * 2002-10-18 2004-04-22 Dhruva Mandal Lash adjuster body
US20040154571A1 (en) * 2002-10-18 2004-08-12 Dhruva Mandal Roller Follower assembly
US20050183686A1 (en) * 2004-02-25 2005-08-25 Hiroki Fujii Hydraulic lash adjuster
US20060180110A1 (en) * 2005-02-14 2006-08-17 Ina-Schaeffler Kg Hydraulic lash adjuster
CN100464097C (en) 2005-10-31 2009-02-25 汉拏空调株式会社 Expansion valve for rear seat air conditioner

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Owner name: MANUFACTURERS HANOVER TRUST COMPANY, NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:PRECISION PRODUCTS CORP.;REEL/FRAME:005060/0283

Effective date: 19890210

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:STANADYNE, INC.;REEL/FRAME:005130/0626

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Effective date: 19971211