US3523459A - Reciprocating mechanisms - Google Patents

Reciprocating mechanisms Download PDF

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Publication number
US3523459A
US3523459A US759690A US3523459DA US3523459A US 3523459 A US3523459 A US 3523459A US 759690 A US759690 A US 759690A US 3523459D A US3523459D A US 3523459DA US 3523459 A US3523459 A US 3523459A
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United States
Prior art keywords
cam
tappet
plunger
roller
fuel
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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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US759690A
Inventor
Dorian Farrar Mowbray
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CAV Ltd
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CAV Ltd
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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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/08—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion
    • F16H25/14—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with reciprocation perpendicular to the axis of rotation
    • 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
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18296—Cam and slide

Definitions

  • a reciprocating mechanism including a tappet which carries a roller, a cam for imparting movement to the tappet and the tappet being provided with flank portions which extend adjacent the side faces of the cam thereby to prevent angular movement of the tappet.
  • This invention relates to reciprocating mechanisms of the kind comprising in combination, a tappet and a rotary cam for imparting movement to the tappet, the tappet incorporating a roller which bears upon the surface of the cam.
  • the object of the invention is to provide such a mechanism in a simple and convenient form.
  • the tappet in a mechanism of the kind specified is provided with flank portions disposed on opposite sides thereof and which can bear against the opposite side surfaces respectively of the cam to prevent angular movement of the tappet.
  • FIG. 1 is a sectional side elevation of one example of a fuel injection pump incorporating the invention
  • FIG. 2 is a section on the line 2-2 of FIIG. 1.
  • an outlet 13 incorporating a spring loaded non return delivery valve 14 and adapted for connection to an injection nozzle associated with an engine cylinder.
  • an inlet port 15 in communication with an annular recess 16 in the body part and to which fuel is fed by a feed pump or other convenient means.
  • the inlet port 15 is so positioned in the bore that it will be uncovered by the inner end of the plunger 12 when the latter is at the outward limit of its travel thus allowing fuel to enter the pumping chamber from the annular recess 16.
  • the inlet port 15 will be covered and fuel will be delivered to the outlet 13 and hence to the engine cylinder by way of the delivery valve 14.
  • a helical groove 17 which as the plunger is moved inwardly, and after the inlet port 15 has been covered by the end of the plunger, reopens the port to spill any fuel remaining in the pumping chamber to the annular recess 16 at the same time terminating the delivery of fuel to the engine cylinder.
  • the angular setting of the plunger 12 relative to the barrel 11 thus determines the point during the inward movement of the plunger when fuel is spilled.
  • a hollow sleeve 19 Surrounding the portion of the barrel remote from the outlet is a hollow sleeve 19 having a pair of longitudinal slots 20 extending inwardly from the outer end and engaging with radial lugs 21 on the plunger.
  • the arrangement is such that longitudinal movement imparted to the plunger will not be transmitted to the sleeve whereas angular movement of the latter will be imparted to the plunger.
  • teeth Formed on the outer periphery of the sleeve 19 are teeth which engage with a toothed fuel control rod 22 mounted for axial movement transversely relative to the plunger axis, in the body part.
  • a spring abutment collar 24 On the outer end of the plunger is a spring abutment collar 24 between which and a washer 25 bearing on an internal shoulder in the body part is a coiled compression spring 26 which urges the plunger outwardly.
  • the collar 24 is located within a cam follower 27 having a roller 28 adapted to coact with a cam 29 rotatable by the engine with which the pump is associated.
  • flank portions 30 which extends downwardly beyond the roller 28 on opposite sides of the cam 29.
  • the ifank portions extend circumferentially about the shaft 31 supporting the cam on opposite sides of the centre line as defined by the axis of the plunger 12.
  • the radius of the shaft 31 is smaller than the minimum radius of the cam 29 so that the latter has continuous side surfaces.
  • the aforesaid flank portions 30 of the follower co-operate with the side surfaces of the cam to prevent angular movement of the follower.
  • the minimum radius of the cam 29 is so chosen that the end faces of the aforesaid flank portions 30 bear upon the shaft 31 when the plunger is at its outermost position. In this manner the roller is removed from the cam surface and more eflicient lubrication of the co-operating surfaces of the cam and roller and the co-operating surfaces of the roller and follower can be efliected.
  • a reciprocating mechanism comprising in combination, a hollow body part, a cylindrical bore mounted in the body part, a cylindrical tappet slidable within said bore, a rotary shaft mounted within the body part, a roller mounted on the tappet, a cam mounted upon the shaft and having side surfaces and a cam surface with which the roller co-operates to effect movement of the tappet, flank portions disposed on opposite sides of the tappet and which bear against the opposite side surfaces respectively of the cam to prevent angular movement of the tappet.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

AugQ'N, 1970 o. F. MOWBRAY 3,523,459
RECIPROCATING MECHANISMS Filefi Sept. 13, 1968 NVE TOR Y m g ATTORNEYS United States Patent Office 3,523,459 Patented Aug. 11, 1970 US. Cl. 7455 2 Claims ABSTRACT OF THE DISCLOSURE A reciprocating mechanism including a tappet which carries a roller, a cam for imparting movement to the tappet and the tappet being provided with flank portions which extend adjacent the side faces of the cam thereby to prevent angular movement of the tappet.
This invention relates to reciprocating mechanisms of the kind comprising in combination, a tappet and a rotary cam for imparting movement to the tappet, the tappet incorporating a roller which bears upon the surface of the cam.
The object of the invention is to provide such a mechanism in a simple and convenient form.
According to the invention in a mechanism of the kind specified the tappet is provided with flank portions disposed on opposite sides thereof and which can bear against the opposite side surfaces respectively of the cam to prevent angular movement of the tappet.
In the accompanying drawings:
FIG. 1 is a sectional side elevation of one example of a fuel injection pump incorporating the invention,
FIG. 2 is a section on the line 2-2 of FIIG. 1.
One example of a reciprocating mechanism in accordance with the invention will now be described as applied to a tappet and cam combination such as is found in a fuel injection pump for supplying fuel to an internal combustion engine. I
At the inner end of the bore is an outlet 13 incorporating a spring loaded non return delivery valve 14 and adapted for connection to an injection nozzle associated with an engine cylinder. Moreover, intermediate the ends of the bore is an inlet port 15 in communication with an annular recess 16 in the body part and to which fuel is fed by a feed pump or other convenient means. The inlet port 15 is so positioned in the bore that it will be uncovered by the inner end of the plunger 12 when the latter is at the outward limit of its travel thus allowing fuel to enter the pumping chamber from the annular recess 16. During the inward movement of the plunger the inlet port 15 will be covered and fuel will be delivered to the outlet 13 and hence to the engine cylinder by way of the delivery valve 14. In the periphery of the plunger and extending from its inner end is a helical groove 17 which as the plunger is moved inwardly, and after the inlet port 15 has been covered by the end of the plunger, reopens the port to spill any fuel remaining in the pumping chamber to the annular recess 16 at the same time terminating the delivery of fuel to the engine cylinder. The angular setting of the plunger 12 relative to the barrel 11 thus determines the point during the inward movement of the plunger when fuel is spilled.
Surrounding the portion of the barrel remote from the outlet is a hollow sleeve 19 having a pair of longitudinal slots 20 extending inwardly from the outer end and engaging with radial lugs 21 on the plunger. The arrangement is such that longitudinal movement imparted to the plunger will not be transmitted to the sleeve whereas angular movement of the latter will be imparted to the plunger.
Formed on the outer periphery of the sleeve 19 are teeth which engage with a toothed fuel control rod 22 mounted for axial movement transversely relative to the plunger axis, in the body part.
On the outer end of the plunger is a spring abutment collar 24 between which and a washer 25 bearing on an internal shoulder in the body part is a coiled compression spring 26 which urges the plunger outwardly. The collar 24 is located within a cam follower 27 having a roller 28 adapted to coact with a cam 29 rotatable by the engine with which the pump is associated.
With this construction it is essential that the tappet or cam follower 27 should not move angularly within the body part 10 and it has been the practice to provide a groove in the peripheral surface of the follower and to provide a peg or similar member in the body part which co-operates with the groove to prevent angular movement of the tappet. Such an arrangement has however a number of disadvantages which the arrangement to be described overcomes.
The peg and the associated groove are omitted and the follower 27 is provided with flank portions 30 which extends downwardly beyond the roller 28 on opposite sides of the cam 29. Moreover, the ifank portions extend circumferentially about the shaft 31 supporting the cam on opposite sides of the centre line as defined by the axis of the plunger 12. Moreover, the radius of the shaft 31 is smaller than the minimum radius of the cam 29 so that the latter has continuous side surfaces. The aforesaid flank portions 30 of the follower co-operate with the side surfaces of the cam to prevent angular movement of the follower.
Conveniently and as shown, the minimum radius of the cam 29 is so chosen that the end faces of the aforesaid flank portions 30 bear upon the shaft 31 when the plunger is at its outermost position. In this manner the roller is removed from the cam surface and more eflicient lubrication of the co-operating surfaces of the cam and roller and the co-operating surfaces of the roller and follower can be efliected.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
1. A reciprocating mechanism comprising in combination, a hollow body part, a cylindrical bore mounted in the body part, a cylindrical tappet slidable within said bore, a rotary shaft mounted within the body part, a roller mounted on the tappet, a cam mounted upon the shaft and having side surfaces and a cam surface with which the roller co-operates to effect movement of the tappet, flank portions disposed on opposite sides of the tappet and which bear against the opposite side surfaces respectively of the cam to prevent angular movement of the tappet.
3 4 2. A mechanism as claimed in claim 1 in which said 1,534,509 4/1925 Falwell 12390 flank portions bear upon said shaft to remove said roller 2,192,913 3/1940 Huber 123-90 from the cam surface during the dwell period of the 2,948,159 8/1960 Wirsching 7455 cam thereby to facilitate lubrication of the co-operating 3,101,077 8/1963 Engle 7455 surfaces of the cam and roller and the roller and tappet. 5 3,267,919 8/1966 Wortman 7455 3,108,580 10/1963 Crane 74-55 References Cited UNITED STATES PATENTS WESLEY S. RATLIFF, 111., Primary Examlner 1,340,717 5/1920 Holle 12390 U.S. Cl. X.R.
1,345,942 7/1920 McCain 123- 90 10 123- 90
US759690A 1967-09-25 1968-09-13 Reciprocating mechanisms Expired - Lifetime US3523459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB43491/67A GB1217318A (en) 1967-09-25 1967-09-25 Reciprocating tappet and cam mechanisms

Publications (1)

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US3523459A true US3523459A (en) 1970-08-11

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US759690A Expired - Lifetime US3523459A (en) 1967-09-25 1968-09-13 Reciprocating mechanisms

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US (1) US3523459A (en)
DE (1) DE6608563U (en)
ES (1) ES358261A1 (en)
FR (1) FR1585497A (en)
GB (1) GB1217318A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152953A (en) * 1977-12-15 1979-05-08 General Motors Corporation Roller cam follower with anti-rotation device
US4335685A (en) * 1979-10-19 1982-06-22 Caterpillar Tractor Co. Lifter assembly
US5520144A (en) * 1995-08-21 1996-05-28 General Motors Corporation Valve actuation assembly
US5709195A (en) * 1993-07-07 1998-01-20 Robert Bosch Gmbh Fuel injection device for internal combustion engines
US20140170005A1 (en) * 2012-12-14 2014-06-19 Koganei Corporation Liquid supply apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2101230B (en) * 1981-06-13 1984-10-10 Lucas Ind Plc Fuel injection pump
DE3618240A1 (en) * 1986-05-30 1987-12-03 Kloeckner Humboldt Deutz Ag Lifting appliance
IT201800006423A1 (en) * 2018-06-18 2019-12-18 PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1340717A (en) * 1919-01-06 1920-05-18 Holle Joseph Cam and push-rod machine
US1345942A (en) * 1917-05-17 1920-07-06 Packard Motor Car Co Method of making valve tappet and roller holders for hydrocarbonmotors
US1534509A (en) * 1924-09-09 1925-04-21 Falwell Wray Valve-operating device
US2192913A (en) * 1937-04-10 1940-03-12 Mell A Bolton Internal combustion engine valve
US2948159A (en) * 1956-04-04 1960-08-09 Daimler Benz Ag Injection pump for internal combustion engine
US3101077A (en) * 1962-06-21 1963-08-20 John H Engle Roller tappet constraining device
US3108580A (en) * 1963-03-13 1963-10-29 Jr Harvey J Crane Non-rotatable valve tappet
US3267919A (en) * 1965-06-21 1966-08-23 Gen Motors Corp Tappet anti-rotating device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1345942A (en) * 1917-05-17 1920-07-06 Packard Motor Car Co Method of making valve tappet and roller holders for hydrocarbonmotors
US1340717A (en) * 1919-01-06 1920-05-18 Holle Joseph Cam and push-rod machine
US1534509A (en) * 1924-09-09 1925-04-21 Falwell Wray Valve-operating device
US2192913A (en) * 1937-04-10 1940-03-12 Mell A Bolton Internal combustion engine valve
US2948159A (en) * 1956-04-04 1960-08-09 Daimler Benz Ag Injection pump for internal combustion engine
US3101077A (en) * 1962-06-21 1963-08-20 John H Engle Roller tappet constraining device
US3108580A (en) * 1963-03-13 1963-10-29 Jr Harvey J Crane Non-rotatable valve tappet
US3267919A (en) * 1965-06-21 1966-08-23 Gen Motors Corp Tappet anti-rotating device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152953A (en) * 1977-12-15 1979-05-08 General Motors Corporation Roller cam follower with anti-rotation device
US4335685A (en) * 1979-10-19 1982-06-22 Caterpillar Tractor Co. Lifter assembly
US5709195A (en) * 1993-07-07 1998-01-20 Robert Bosch Gmbh Fuel injection device for internal combustion engines
US5520144A (en) * 1995-08-21 1996-05-28 General Motors Corporation Valve actuation assembly
US20140170005A1 (en) * 2012-12-14 2014-06-19 Koganei Corporation Liquid supply apparatus
US9506458B2 (en) * 2012-12-14 2016-11-29 Koganei Corporation Liquid supply apparatus

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Publication number Publication date
GB1217318A (en) 1970-12-31
FR1585497A (en) 1970-01-23
ES358261A1 (en) 1970-04-01
DE6608563U (en) 1971-10-07

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