US3276760A - Anti-surge coil spring assembly - Google Patents

Anti-surge coil spring assembly Download PDF

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Publication number
US3276760A
US3276760A US348329A US34832964A US3276760A US 3276760 A US3276760 A US 3276760A US 348329 A US348329 A US 348329A US 34832964 A US34832964 A US 34832964A US 3276760 A US3276760 A US 3276760A
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United States
Prior art keywords
guide
plunger
separating ring
coil spring
housing
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Expired - Lifetime
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US348329A
Inventor
Everton L Last
Conrad A Teichert
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Motors Liquidation Co
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Motors Liquidation Co
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Publication date
Application filed by Motors Liquidation Co filed Critical Motors Liquidation Co
Priority to US348329A priority Critical patent/US3276760A/en
Application granted granted Critical
Publication of US3276760A publication Critical patent/US3276760A/en
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Expired - Lifetime legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/02Placing by driving
    • E02D7/06Power-driven drivers
    • E02D7/12Drivers with explosion chambers
    • E02D7/125Diesel drivers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M57/00Fuel-injectors combined or associated with other devices
    • F02M57/02Injectors structurally combined with fuel-injection pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/07Nozzles and injectors with controllable fuel supply
    • F02M2700/078Injectors combined with fuel injection pump
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/13Special devices for making an explosive mixture; Fuel pumps
    • F02M2700/1317Fuel pumpo for internal combustion engines
    • F02M2700/1335Fuel pump combined with the fuel injector

Description

Oct. 4, 1966 E. L. LAST ETAL ANTI-SURGE COIL SPRING ASSEMBLY Filed March 2, 1964 INVENTORS EVERTON L. LAST BY CONRADA TE/CHERT United States Patent 3,276,760 ANTI-SURGE COIL SPRING ASSEMBLY Ever-ton L. Last and Conrad A. Teichert, both of Grand Rapids, Mich., assignors to General Motors Corporatlon, Detroit, Mich., a corporation of Delaware Filed Mar. 2, 1964, Ser. No. 348,329
3 Claims. (Cl. 267-1) This invention rel-ates generally to fuel injection apparatus for internal combustion engines, and particularly to the fuel injector plunger return spring assembly.
In fuel injection units it is a common practice to use a coil spring to return the fuel metering plunger to a retracted position after the plunger has been actuated and fuel injected into the combustion chamber of an engine. It will be appreciated that when an impulse is imparted to such a coil spring as the plunger is retracted, the impulse travels the length of the spring and is reflected back. If the natural frequency of the spring is low, one such impulse will not be materially dampened before one or more succeeding impulses are imparted to the spring with the result that the spring is caused to surge. Such surging material-1y effects the position of fuel metering grooves in the plunger assembly with a resultant decrease in eificiency of the unit.
It is the primary purpose of this invention to overcome such heretofore encountered difficulties by providing a spring damping means which dampens or attenuates spring vibrations that may develop during operation of a spring assembly.
It is a more specific object of this invention to provide a damping means which is disposed between two coil springs and provides a frictional damping force therebetween.
It is a further object of this invention to provide a spring damping means employing a sliding friction member which may be adjusted to vary the darn-ping rate without requiring additional machining of any of the parts comprising the damping assembly.
Other objects and advantages of the present invention will be more clearly understood from the following description having reference to the drawing wherein:
FIGURE 1 is a sectional view of a portion of a 'housing member of an internal combustion engine and its fuel injection apparatus showing the components of the subject invention in an assembled relationship.
FIGURE 2 is a perspective view of the spring separating ring shown in FIGURE 1 illustrating one embodiment of the present invention.
FIGURE 3 is a perspective view of a further embodiment of the separating ring of FIGURE 2.
FIGURE 4 is a perspective view illustrating another embodiment of the separating ring of FIGURE 3.
Referring now in detail to the drawing, and first to FIGURE 1, a fuel injection device embodying the subject invention incorporates a housing member 1 to which is secured fuel supply connections 2 and 3 in the conventional manner. The housing member 1 includes a chamber 4 which receives a reciprocating plunger designated generally as 5.
A slide piece 9 forms the upper port-ion of the reciprocating plunger and transmits its motion to an injector member 10. The lower end of the injector member 10 slid-ably reciprocates in a pump cylinder 11 which is rigidly secured in the housing member 1 by a nut \12 threaded to the housing as at 13. The structure and operation of the lower pumping cylinder -11 to effect discharge of fuel from a spray tip 14 is similar to that shown in Patent No. 2,997,994 to RF. 'Fa-lberg and forms no part of this invention.
The upper end of the slide piece 9 has an outer end surface 15 formed thereon. A shoulder 16 is formed on the underside of the upper end of slide piece to seat a coil spring as hereinafter described.
A guide means 17, integral with the housing 1, has a slot \18 therein which receives the end 19 of a'guide pin 20. The guide pin is slidably positioned in a chamber 21 of the slide piece 9 and is biased against a retaining ring 22 by a spring 23 disposed between the end surface 24 of the guide pin and a retaining ring 25 secured to the slide piece.
A shoulder or spring seat 26 is provided on the housing member 1 adjacent the guide means 17 to receive a coil spring as hereinafter described. The outer surface 27 of the guide means is adapted to receive a separating ring, designated generally by the numeral 28, in sliding relation.
The separating ring, as illustrated more clearly in FIG- URE 2, has an axially extending sleeve 29. A radially extending flange 32 formed integral 'with the axially extending sleeve 29, is disposed intermediate the ends of the axially extending sleeve and divides it into two end portions 30 and 31. Surfaces 33 and 34, shown in FIG- URE 1, of the radially extending flange 32 act as spring seats for the coil springs 35 and 36, respectively, when the separating ring is in its assembled position. The inner surface 37 of the axially extending sleeve 29 is formed to a dimension which provides a sliding frictional contact with the outer surface 27 of the guide means 17.
The coil spring 35 in interposed between the shoulder 16 of the slide piece 9 and the separating ring 28, with one end of the spring abutting the shoulder 16 and the other end abutting the surface 33 of the radially extending flange 32. The coil spring 36 is interposed between the shoulder 26 on the housing member 1 and the separating ring 28 with one end of the spring abutting the shoulder 26, and the other end seating against the surface 34 of the radial flange 32. The end portions 30 and 31 of the axially extending sleeve 29 are received within the inner diameters of the coil springs 35 and 36, respectively. The springs 35 and 36 may have either equal or different spring rates.
FIGURES 3 and 4 illustrate [further embodiments of the separating ring. FIGURE 3 shows the separating ring 28 having a radial slot 38 through both the radially extending flange '32 and the axially extending sleeve 29 to form a discontinuous ring. FIGURE 4 illustrates a radially extending flange 32 having a plurality of slots 39 therein with one of the slots 38 passing through both the radial flange and the axial sleeve.
Referring again to FIGURE 1, a contact wheel 40, rotatably mounted on a lever 41, contacts the outer surface 15 of the slide piece 9 and imparts axial motion to the plunger member 5 from an external source in the conventional manner.
In operation, axial motion is imparted to the plunger member 5 through the contact wheel 40 and the lever 41. Downward mot-ion of the slide piece 9 causes the coil springs 35 and 36 to be compressed, resisting downward movement of the plunger member. The separating ring 28, being interposed between the ends of the springs 35 and 36 will also be moved downwardly as the springs are compressed. The inner surface 37 of the separating ring 28 illustrated in FIGURE 2, having been formed to provide a sliding friction fit when in engagement with the outer surface 27 of the guide means 17, will create a friction force tending to oppose movement of the separating ring.
When the plunger member has reached its predetermined maximum downward position, upward movement of the lever 41 will allow the springs 35 and 36 to return the plunger member 5 to its outermost position, maintaining the outer surface 15 of the slide piece 9 in contact with the wheel 40. Expansion of the springs 35 and 36 during retraction of the plunger member causes the separating ring 28 to return to its original position with the frictional force created bysliding contact of the surface 37 on the guide member 17 tending to oppose such movement.
It can be readily understood that as the plunger member reciprocates at a high rate and the springs 35 and 36 are compressed and relaxed, the separating ring 28 will undergo reciprocating motion on the guide means 17. The ifrictiona l force created between the inner face 37 of the separating ring and the outer surface 27 of the guide means will always be in a direction tending to oppose movement of the separating ring, thus acting to dampen axial vibrations induced in the coil springs and prevent surging of the plunger member.
Using a separating ring as shown in FIGURE 3, which constitutes one embodiment of the present invention, the 1 frictional force between the inner riding surface 37 of the axially extending sleeve 29 and the outer surface 27 of the guide means 17 may be controlled through radial adjustment of the separating ring, such adjustment being readily allowable by provision of the slot 38. An increase in friction force would be desirable when the injection apparatus is to be operated at a high frequency where the danger of the springs surging would be increased.
In the event that the injection apparatus is to he operated under conditions where adjustment of the separating ring to vary the aforementioned friction force is desirable, the slots 39 provided in the radially extending flange 32, as shown in FIGURE 4, will allow radial adjustment of the separating ring without distortion of the radially extending flange. Such distort-ion is undesirable in that it would affect the seating of the coil springs 35 and 36 on the surfaces 33 and 34, respectively, of the radially extending flange with a resultant cocking or tilting of the separating ring, thereby reducing the rings ef- 'fectiveness in damping vibration.
It is appreciated that various minor changes in the construction and arrangement of the .parts may be made without departing from the spirit and scope of the invention as hereinafter defined. I
What is claimed is:
1. In a fuel injection device including a housing memher having a chamber therein receiving a reciprocating plunger, a guide means integral with said housing member,
said plunger being disposed within said guide means, a
separating ring slidably disposed about said guide means, said separating ring including an axially extending sleeve and a radially extending flange intermediate the ends of said axially extending sleeve and integral therewith, a (first coil spring interposed between the outer end of said plunger and said radial flange, and a second coil spring interposed between said housing member and said radial flange, said separating ring frictionally engaging said. guide means to attenuate vibration of said springs.
2. In a fuel injection device including a housing member having a chamber therein receiving a reciprocating plunger, a guide means integral with said housing member, said plunger being disposed within said guide means, a separating ring slida-bly disposed about said guide means, said separating ring including an axially extending sleeve and a radially extending flange intermediate the ends of said axially extending sleeve and integral therewith, a first coil spring interposed between the outer end of said plunger and said radial flange, and a second coil spring interposed between said housing member and said radial flange, said separating ring frictionally engaging said guide means and having a slot therethrough to form a discontinuous ring which may be radially adjusted to vary the frictional force between said ring and said guide means to change the dampening eflect of said separating ring.
3. A device as described in claim 2 wherein said radially extending flange has a plurality of slots therein to allow radial adjustment of said separating fling without distortion of said radially extending flange.
References Cited by the Examiner UNITED STATES PATENTS ARTHUR L. LA POINT, Primary Examiner.
W. B. WILBUR, R. M. WOHIJFARTI'I,
Assistant Examiners.

Claims (1)

1. IN A FUEL INJECTION DEVICE INCLUDING A HOUSING MEMBER HAVING A CHAMBER THEREIN RECEIVING A RECIPROCATING PLUNGER, A GUIDE MEANS INTEGRAL WITH SAID HOUSING MEMBER, SAID PLUNGER BEING DISPOSED WITHIN SAID GUIDE MEANS, A SEPARATING RING SLIDABLY DISPOSED ABOUT SAID GUIDE MEANS, SAID SEPARATING RING INCLUDING AN AXIALLY EXTENDING SLEEVE AND A RADIALLY EXTENDING FLANGE INTERMEDIATE THE ENDS OF SAID AXIALLY EXTENDING SLEEVE AND INTEGRAL THEREWITH, A FIRST COIL SPRING INTERPOSED BETWEEN THE OUTER END OF SAID PLUNGER AND SAID RADIAL FLANGE, AND A SECOND COIL SPRING INTERPOSED BETWEEN SAID HOUSING MEMBER AND SAID RADIAL FLANGE, SAID SEPATATING RING FRICTIONALLY ENGAGING SAID GUIDE MEANS TO ATTENUATE VIBRATION OF SAID SPRINGS.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358778A (en) * 1965-08-19 1967-12-19 Ferwerda Ray Spring driven power hammer
FR2349744A1 (en) * 1976-04-30 1977-11-25 Cummins Engine Co Inc Mechanically actuated diesel engine fuel injector - has auxiliary return spring to give two different injection speeds
US4280863A (en) * 1979-08-22 1981-07-28 Monarch Marking Systems, Inc. Label printing and applying apparatus
US4280862A (en) * 1979-08-22 1981-07-28 Monarch Marking Systems, Inc. Label printing and applying apparatus
US4452574A (en) * 1982-01-15 1984-06-05 Robert Bosch Gmbh Fuel injection pump
US4670715A (en) * 1983-01-28 1987-06-02 Caterpillar Inc. Frictionally supported gear tooth sensor with self-adjusting air gap
US5010783A (en) * 1990-07-02 1991-04-30 Caterpillar Inc. Tappet retainer assembly

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033035A (en) * 1931-12-22 1936-03-03 American Eng Co Ltd Mooring device
US2108124A (en) * 1936-01-21 1938-02-15 Nat Malleable & Steel Castings Cushioning device
FR869774A (en) * 1939-08-04 1942-02-16 Elektron Co Mbh Shock absorber particularly applicable to airplanes
US2439706A (en) * 1946-02-23 1948-04-13 Charles A West Temperature controlled actuating mechanism
GB771392A (en) * 1954-02-26 1957-04-03 Usines Des Ressorts Du Nord Improvements in and relating to a damping device for a suspension and suspension incorporating this device
US2789550A (en) * 1955-01-31 1957-04-23 Gen Motors Corp Anti-surge spring means

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2033035A (en) * 1931-12-22 1936-03-03 American Eng Co Ltd Mooring device
US2108124A (en) * 1936-01-21 1938-02-15 Nat Malleable & Steel Castings Cushioning device
FR869774A (en) * 1939-08-04 1942-02-16 Elektron Co Mbh Shock absorber particularly applicable to airplanes
US2439706A (en) * 1946-02-23 1948-04-13 Charles A West Temperature controlled actuating mechanism
GB771392A (en) * 1954-02-26 1957-04-03 Usines Des Ressorts Du Nord Improvements in and relating to a damping device for a suspension and suspension incorporating this device
US2789550A (en) * 1955-01-31 1957-04-23 Gen Motors Corp Anti-surge spring means

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358778A (en) * 1965-08-19 1967-12-19 Ferwerda Ray Spring driven power hammer
FR2349744A1 (en) * 1976-04-30 1977-11-25 Cummins Engine Co Inc Mechanically actuated diesel engine fuel injector - has auxiliary return spring to give two different injection speeds
US4280863A (en) * 1979-08-22 1981-07-28 Monarch Marking Systems, Inc. Label printing and applying apparatus
US4280862A (en) * 1979-08-22 1981-07-28 Monarch Marking Systems, Inc. Label printing and applying apparatus
US4452574A (en) * 1982-01-15 1984-06-05 Robert Bosch Gmbh Fuel injection pump
US4670715A (en) * 1983-01-28 1987-06-02 Caterpillar Inc. Frictionally supported gear tooth sensor with self-adjusting air gap
US5010783A (en) * 1990-07-02 1991-04-30 Caterpillar Inc. Tappet retainer assembly
WO1992000450A1 (en) * 1990-07-02 1992-01-09 Caterpillar Inc. Tappet retainer assembly

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