US3302628A - Internal combustion engine valve gear - Google Patents

Internal combustion engine valve gear Download PDF

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Publication number
US3302628A
US3302628A US515417A US51541765A US3302628A US 3302628 A US3302628 A US 3302628A US 515417 A US515417 A US 515417A US 51541765 A US51541765 A US 51541765A US 3302628 A US3302628 A US 3302628A
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United States
Prior art keywords
slide member
end portion
valve
internal combustion
slide
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Expired - Lifetime
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US515417A
Inventor
Leach Clayton Blaine
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Motors Liquidation Co
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Motors Liquidation Co
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    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/52—Mechanical actuating means with crank, eccentric, or cam
    • F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
    • F16K31/52408—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a lift valve
    • 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
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • F01L1/183—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft of the boat type
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18888—Reciprocating to or from oscillating
    • Y10T74/1892—Lever and slide
    • Y10T74/18936—Slidable connections
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20582—Levers

Definitions

  • valve tappets act directly on the rockers
  • the problem arises of ensuring that an automatic rotary movement of the valve tappet (such as is commonly provided in known manner) and also the movements of both parts with respect to each other are kept as free from friction as possible.
  • a further problem which may arise is that of guiding the rocker arm transversely of its plane of movement. The latter is of particular importance in those valve operating gears in which the rocker arms are constructed as sheet metal pressings and are mounted on hemispherical bearing faces.
  • a thrust transmission member between the valve actuator members is constructed as a slide member which engages with one actuator member through a ball and socket connection and is slidably engaged with the other actuator member.
  • the slide member is of mushroom shape, a part-spherical head on the mushroom forming one part of the ball and socket connection and the underside of the mushroom being formed as a slide face and the stem serving as a lateral guide for the slide member in a pin and slot connection therewith.
  • the slide member preferably guides the rocker arm transverse to its plane of movement and is preferably non-detachably connected with one actuator member.
  • FIGURE 1 is a vertical section through a portion of the cylinder head of an internal combustion engine having a valve gear according to the invention.
  • FIGURE 2 is a part section elevation, to a larger scale, of a thrust transmission member which forms part of the valve gear shown in FIGURE 1.
  • FIGURE 1 of the drawings shows a cylinder head 14 including a cam of a camshaft (not shown), an inlet passage 11 closable by a poppet valve 12, and a liquid coolant passage 13.
  • the valve 12 is pressed towards its closed position by a spring 15 one end of which abuts the cylinder head 14 and the other end of which abuts a valve disc 16 which is secured on the stem 17 of the valve 12 by frusto-conical collar members 20, 21 which engage, in known manner, 'in a groove 22 on the valve stem 17.
  • a valve tappet 26 is mounted in a bore 25 in the cylinder head 14 and is adapted to be reciprocated axially upon rotation of the cam 10, the latter engaging the tappet slightly eccentrically, in known manner, so as to ensure rotation of the tappet about its longitudinal axis during operation of the valve gear.
  • a rocker arm 30 formed as a sheet metal stamping having in the central portion thereof a part-spherical depression 31 in which is an opening 32 through which extends a pin 33 the lower end of which is press-fitted in a bore 34 in the cylinder head 14.
  • a member 35 of part-spherical shape and adapted to engage in the depression 31 forms a bearing for the rocker arm 30 and is adjusted and secured in position on the upper end of the pin 33 by means of a nut 36.
  • One end 37 of the rocker arm 30 engages the upper end of the valve stem 17 and the other end 45 of the rocker arm 30 carries a slide member 40 (see also FIGURE 2) which acts as a thrust transmission member between the valve tappet 26 and the rocker arm 30.
  • the slide member 46 is of mushroom shape, having a stem 46 With a part-spherical head 41 .adapted to engage in the manner of a ball and socket joint with a corresponding part-spherical socket 42 in the upper end of the valve tappet 26.
  • the under-side of the head 41 of the slide member 40 is formed with a fiat slide surface 43 which engages a flat face 44 at said other end 45 of the rocker arm 30.
  • the under-side of the head 41 is formed with an annular recess 47 between the slide surface 43 and the stem 46.
  • the stem 46 of the slide member 40 protrudes through a slot 43 in the end 45 of the rocker arm 30, the slot 48 being of sufiicient width to enable the stem 46 to move freely therein.
  • the socket 42 of the tappet 26 is also formed with a blind bore 49.
  • the end of the stem 46 is upset to form a flange 5% so that the slide member 40 after being assembled with the rocker arm 30 cannot become detached therefrom. This facilitates assembly of the valve gear and also disassembly for repair or adjustment.
  • the part-spherical head 41 on the slide member 46 and the similarly shaped recess 42 on the tappet 26 permit rotation of the tappet 26 during its reciprocation; and the pin and slot connection between the slide member 40 and the valve rocker 30 provides guiding of the rocker arm transverse to its plane of movement, so that rotation of the rocker arm about the pin 33 is prevented.
  • the annular groove 47 and the blind bore 49 act as reservoirs for lubricant, which is delivered in known manner to the rocker arm 30 and tappet 26, and thus facilitate the lubrication of the relatively movable surfaces on the rocker arm, tappet and slide member.
  • thrust is transmitted between a reciprocatory and an oscillatory member by means of a slide member which has a ball and socket engagement with one member and a slidable engagement with the other member.
  • An internal combustion engine valve gear assembly comprising a cylinder head; a poppet valve with a stem mounted for reciprocation in said head; a support pin secured in said head and carrying a part-spherical bearing at .its free end; a pressed metal valve rocker mounted for oscillation on said bearing, said rocker having an apertured part-spherical depression engaged by said bearing and said pin extending through the aperture in said depression, and one end of said rocker engaging the end of said valve stem; a valve tappet mounted for reciprocation in said head and formed with a part-spherical depression in one end thereof; a camshaft rotatably mounted in said head and carrying a cam Which engages the other end of said tappet; and .a slide member of mushroom shape having a part-spherical head which engages the depression in said tappet and has an under-face which is in slidable engagement with a complementary face on the other end of said rocker, a stem which extends through a slot in said other end of the rocker, and
  • Valve gear for an internal combustion engine comprising a reciprocable member having an end portion, an oscillating member having an end portion facing said first named end portion and a slide member engaging both said end portions and in thrust transmitting relationship therewith, said slide member and one of said end portions having coacting surfaces to form ball-andsocket-like engaging surfaces and said slide member and the other of said end portions having coacting surfaces to form slidably engaging surfaces, said slide member being of generally mushroom shape and having a spherical head for engaging said one end portion and a slide face opposite said spherical 'head with a stem extending therefrom into a slot formed in said other end portion, said slide member being non-detachably connected with said oscillatory member.
  • Valve gear for an internal combustion engine comprising a valve tappet having a reciprocable end portion, a rocker arm having an oscillatory end portion positioned opposite said first named end portion and a 4 slide member engageable with both said end portions and adapted to transmit thrust therebetween, .said slide member cooperating with one of said end portions to form a ball-and-socket-like connection therewith and said slide member cooperating with the other of said end portions to form a slidable engagement therewith, said slide member being of generally mushroom shape having a part-spherical head engageable with a corresponding recess in said valve tappet end, a slide face on the underside of said head engageable With the end portion of said rocker arm and a stem extending from the underside of said slide member head through a slot in said rocker arm end portion to limit the slidable motion of said slide member with respect to said rocker arm to a predetermined path.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Description

Feb. 7, 1967 c. B. LEACH 3,302,628
INTERNAL COMBUSTION ENGINE VALVE GEAR Filed Dec. 21, 1965 //VVE/VTOR 45 4/ 47 40 CZkjiah 15/02! ea/2 kazgym A Horney United States Patent 4 Claims. (31. 123-90 This invention relates to internal combustion engine valve gears.
In internal combustion engines in which the valve tappets act directly on the rockers, the problem arises of ensuring that an automatic rotary movement of the valve tappet (such as is commonly provided in known manner) and also the movements of both parts with respect to each other are kept as free from friction as possible. A further problem which may arise is that of guiding the rocker arm transversely of its plane of movement. The latter is of particular importance in those valve operating gears in which the rocker arms are constructed as sheet metal pressings and are mounted on hemispherical bearing faces.
In an internal combustion engine valve gear according to this invention a thrust transmission member between the valve actuator members is constructed as a slide member which engages with one actuator member through a ball and socket connection and is slidably engaged with the other actuator member.
According to a further feature of the invention, the slide member is of mushroom shape, a part-spherical head on the mushroom forming one part of the ball and socket connection and the underside of the mushroom being formed as a slide face and the stem serving as a lateral guide for the slide member in a pin and slot connection therewith.
The slide member preferably guides the rocker arm transverse to its plane of movement and is preferably non-detachably connected with one actuator member.
The scope of the invention is defined by the appended claims; and the invention and the method by which it is to be performed are hereinafter particularly described with reference to the accompanying drawings in which:
FIGURE 1 is a vertical section through a portion of the cylinder head of an internal combustion engine having a valve gear according to the invention; and
FIGURE 2 is a part section elevation, to a larger scale, of a thrust transmission member which forms part of the valve gear shown in FIGURE 1.
FIGURE 1 of the drawings shows a cylinder head 14 including a cam of a camshaft (not shown), an inlet passage 11 closable by a poppet valve 12, and a liquid coolant passage 13. The valve 12 is pressed towards its closed position by a spring 15 one end of which abuts the cylinder head 14 and the other end of which abuts a valve disc 16 which is secured on the stem 17 of the valve 12 by frusto- conical collar members 20, 21 which engage, in known manner, 'in a groove 22 on the valve stem 17.
A valve tappet 26 is mounted in a bore 25 in the cylinder head 14 and is adapted to be reciprocated axially upon rotation of the cam 10, the latter engaging the tappet slightly eccentrically, in known manner, so as to ensure rotation of the tappet about its longitudinal axis during operation of the valve gear.
The reciprocatory movement of the tappet 26 is transmitted to the valve 12 by means of a rocker arm 30 formed as a sheet metal stamping having in the central portion thereof a part-spherical depression 31 in which is an opening 32 through which extends a pin 33 the lower end of which is press-fitted in a bore 34 in the cylinder head 14.
A member 35 of part-spherical shape and adapted to engage in the depression 31 forms a bearing for the rocker arm 30 and is adjusted and secured in position on the upper end of the pin 33 by means of a nut 36. One end 37 of the rocker arm 30 engages the upper end of the valve stem 17 and the other end 45 of the rocker arm 30 carries a slide member 40 (see also FIGURE 2) which acts as a thrust transmission member between the valve tappet 26 and the rocker arm 30. The slide member 46 is of mushroom shape, having a stem 46 With a part-spherical head 41 .adapted to engage in the manner of a ball and socket joint with a corresponding part-spherical socket 42 in the upper end of the valve tappet 26. The under-side of the head 41 of the slide member 40 is formed with a fiat slide surface 43 which engages a flat face 44 at said other end 45 of the rocker arm 30. The under-side of the head 41 is formed with an annular recess 47 between the slide surface 43 and the stem 46.
The stem 46 of the slide member 40 protrudes through a slot 43 in the end 45 of the rocker arm 30, the slot 48 being of sufiicient width to enable the stem 46 to move freely therein.
The socket 42 of the tappet 26 is also formed with a blind bore 49.
As shown in FIGURE 1, the end of the stem 46 is upset to form a flange 5% so that the slide member 40 after being assembled with the rocker arm 30 cannot become detached therefrom. This facilitates assembly of the valve gear and also disassembly for repair or adjustment.
In the operation of the valve gear the reciprocation of the tappet 26 upon rotation of the cam 10 effects oscillation of the rocker arm 30 on the bearing member 35 to effect reciprocation of the valve 12, the relative movement between the rocker arm 30 and the tappet 26 in a plane transverse to the axis of the tappet being accommodated by relative movement between the slide surface 43 of the slide member 40 and the slide surface 44 at the end 45 of the rocker arm, the slot 48 accommodating the movement of the stem 46 during such sliding movement. The part-spherical head 41 on the slide member 46 and the similarly shaped recess 42 on the tappet 26 permit rotation of the tappet 26 during its reciprocation; and the pin and slot connection between the slide member 40 and the valve rocker 30 provides guiding of the rocker arm transverse to its plane of movement, so that rotation of the rocker arm about the pin 33 is prevented.
The annular groove 47 and the blind bore 49 act as reservoirs for lubricant, which is delivered in known manner to the rocker arm 30 and tappet 26, and thus facilitate the lubrication of the relatively movable surfaces on the rocker arm, tappet and slide member.
It will \be seen from the foregoing description of one embodiment of the invention that, thrust is transmitted between a reciprocatory and an oscillatory member by means of a slide member which has a ball and socket engagement with one member and a slidable engagement with the other member.
I claim:
1. An internal combustion engine valve gear assembly, comprising a cylinder head; a poppet valve with a stem mounted for reciprocation in said head; a support pin secured in said head and carrying a part-spherical bearing at .its free end; a pressed metal valve rocker mounted for oscillation on said bearing, said rocker having an apertured part-spherical depression engaged by said bearing and said pin extending through the aperture in said depression, and one end of said rocker engaging the end of said valve stem; a valve tappet mounted for reciprocation in said head and formed with a part-spherical depression in one end thereof; a camshaft rotatably mounted in said head and carrying a cam Which engages the other end of said tappet; and .a slide member of mushroom shape having a part-spherical head which engages the depression in said tappet and has an under-face which is in slidable engagement with a complementary face on the other end of said rocker, a stem which extends through a slot in said other end of the rocker, and a flange on the end of said stem whereby said slide member is non-detachably but slida'bly connected to said rocker.
2. Valve gear for an internal combustion engine comprising a reciprocable member having an end portion, an oscillating member having an end portion facing said first named end portion and a slide member engaging both said end portions and in thrust transmitting relationship therewith, said slide member and one of said end portions having coacting surfaces to form ball-andsocket-like engaging surfaces and said slide member and the other of said end portions having coacting surfaces to form slidably engaging surfaces, said slide member being of generally mushroom shape and having a spherical head for engaging said one end portion and a slide face opposite said spherical 'head with a stem extending therefrom into a slot formed in said other end portion, said slide member being non-detachably connected with said oscillatory member.
3. Valve gear for an internal combustion engine comprising a valve tappet having a reciprocable end portion, a rocker arm having an oscillatory end portion positioned opposite said first named end portion and a 4 slide member engageable with both said end portions and adapted to transmit thrust therebetween, .said slide member cooperating with one of said end portions to form a ball-and-socket-like connection therewith and said slide member cooperating with the other of said end portions to form a slidable engagement therewith, said slide member being of generally mushroom shape having a part-spherical head engageable with a corresponding recess in said valve tappet end, a slide face on the underside of said head engageable With the end portion of said rocker arm and a stem extending from the underside of said slide member head through a slot in said rocker arm end portion to limit the slidable motion of said slide member with respect to said rocker arm to a predetermined path.
4. Valve gear as defined in claim 3 wherein the end of said slide member stem is flanged so as to prevent disengagement of said slide member from said rocker arm slot.
References Cited by the Examiner UNITED STATES PATENTS 1,499,928 7/1924 Hutt 12390 1,798,938 3/1931 Hallett 1239O 2,654,266 10/1953 Edelen 74-569 X FOREIGN PATENTS 122,981 12/ 1946 Australia. 592,731 9/ 1947 Great Britain.
MARK NEWMAN, Primary Examiner.
AL LAWRENCE SMITH, Examiner.

Claims (1)

  1. 2. VALVE GEAR FOR AN INTERNAL COMBUSTION ENGINE COMPRISING A RECIPROCABLE MEMBER HAVING AN END PORTION, AN OSCILLATING MEMBER HAVING AN END PORTION FACING SAID FIRST NAMED END PORTION AND A SLIDE MEMBER ENGAGING BOTH SAID END PORTIONS AND IN THRUST TRANSMITTING RELATIONSHIP THEREWITH, SAID SLIDE MEMBER AND ONE OF SAID END PORTIONS HAVING COACTING SURFACES TO FORM BALL-ANDSOCKET-LIKE ENGAGING SURFACES AND SAID SLIDE MEMBER AND THE OTHER OF SAID END PORTIONS HAVING COACTING SURFACES TO FORM SLIDABLY ENGAGING SURFACES, SAID SLIDE MEMBER BEING OF GENERALLY MUSHROOM SHAPE AND HAVING A SPHERICAL HEAD FOR ENGAGING SAID ONE END PORTION AND A SLIDE FACE OPPOSITE SAID SPHERICAL HEAD WITH A STEM EXTENDING THEREFROM INTO A SLOT FORMED IN SAID OTHER END PORTION, SAID SLIDE MEMBER BEING NON-DETACHABLY CONNECTED WITH SAID OSCILLATORY MEMBER.
US515417A 1965-01-20 1965-12-21 Internal combustion engine valve gear Expired - Lifetime US3302628A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEO10611A DE1284235B (en) 1965-01-20 1965-01-20 Valve control for internal combustion engines

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US3302628A true US3302628A (en) 1967-02-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661127A (en) * 1970-05-07 1972-05-09 Johnson Products Inc Hydraulic tappet with swivelably mounted pushrod

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1499928A (en) * 1923-07-05 1924-07-01 Albert E Hutt Valve-stem silencer
US1798938A (en) * 1927-04-25 1931-03-31 Gen Motors Res Corp Hydraulic slack adjuster
GB592731A (en) * 1945-05-30 1947-09-26 John Wooler An improved valve actuating mechanism of the rocker type for internal combustion engines
US2654266A (en) * 1951-07-12 1953-10-06 Carter Carburetor Corp Eccentric and follower mechanism

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH322762A (en) * 1954-06-11 1957-06-30 Sulzer Ag Hydraulic device to compensate for valve clearance
US3045658A (en) * 1959-12-08 1962-07-24 Thompson Ramo Wooldridge Inc Valve operating mechanism
US3082755A (en) * 1960-12-07 1963-03-26 Ford Motor Co Valve gear

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1499928A (en) * 1923-07-05 1924-07-01 Albert E Hutt Valve-stem silencer
US1798938A (en) * 1927-04-25 1931-03-31 Gen Motors Res Corp Hydraulic slack adjuster
GB592731A (en) * 1945-05-30 1947-09-26 John Wooler An improved valve actuating mechanism of the rocker type for internal combustion engines
US2654266A (en) * 1951-07-12 1953-10-06 Carter Carburetor Corp Eccentric and follower mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661127A (en) * 1970-05-07 1972-05-09 Johnson Products Inc Hydraulic tappet with swivelably mounted pushrod

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GB1057210A (en) 1967-02-01
DE1284235B (en) 1969-02-20

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