US3548799A - Decompression device for internal combustion engine - Google Patents

Decompression device for internal combustion engine Download PDF

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Publication number
US3548799A
US3548799A US801965A US3548799DA US3548799A US 3548799 A US3548799 A US 3548799A US 801965 A US801965 A US 801965A US 3548799D A US3548799D A US 3548799DA US 3548799 A US3548799 A US 3548799A
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United States
Prior art keywords
decompression
decompression device
plunger rod
plunger
driving
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Expired - Lifetime
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US801965A
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English (en)
Inventor
Josef Johann Lang
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Individual
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Individual
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Publication date
Priority claimed from DE19681601973 external-priority patent/DE1601973A1/de
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Publication of US3548799A publication Critical patent/US3548799A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio

Definitions

  • This invention relates to internal combustion engines, and in particular it relates to a new and improved decompression device for an internal combustion engine.
  • This invention relates to a decompression device for combustion engines, for example, injection combustion engines, having an exhaust valve controlled through a plunger rod, this device comprising a decompression cam, which may be a decompression shaft having a milled out flattened portion, which acts on a control part of the plunger rod and is adapted to be moved to a decompression cutout position by an automatic means which includes a driving'plate which is coupled to the decompression shaft and a driver cooperating with this plate and operable so that, when the plunger rod moves in one sense this driver engages the driving plate and, when the plunger rod moves in the other sense, the driver is disengaged from the plate under the action of spring means.
  • a decompression cam which may be a decompression shaft having a milled out flattened portion, which acts on a control part of the plunger rod and is adapted to be moved to a decompression cutout position by an automatic means which includes a driving'plate which is coupled to the decompression shaft and a
  • the present invention provides an arrangement in which the driver is in the form of a driving plunger which is movable at least approximately parallel to the said plunger rod and is actuated by one of the operating parts, for example, from the plunger rod itself, said driving plunger being mounted in resiliently yielding fashion in an abutment body, separate from the operating parts of the device, which body is adjustable by the decompression cam and acts as a stop for the operating part which actuates the driving plunger, for example the said plunger rod.
  • the abutment body has a cylindrical part mounted in a housing of the decompression device and has an arm which engages around the plunger rod and a flange with a substantially spherical opening for the driving plunger.
  • a cylindrical abutment member is adjustably secured to the plunger rod, and this member cooperates on the one hand with the driving plunger and, on the other hand with an abutment surface of the abutment body.
  • FIG. 1 is a cross section through the decompression device, and showing also the exhaust valve
  • FIG. 2 illustrates a detail of the mechanism seen in FIG. 1 but turned approximately 90 in the counterclockwise direction relative to the position of FIG. 1;
  • FIG. 3 and 4 show the assembly in different operating positions.
  • an exhaust valve 2 Arranged in the housing 10 of an injection combustion engine of known construction, a part of which is shown at 1. is an exhaust valve 2 which is pressed against its valve seat 3 by a closure spring 4 which acts between a fixed part of the combustion engine 1 and a collar 5 fixed on the valve stem 6, the latter being operationally integral with a plunger 16.
  • the plunger rod 16 which is raised and lowered by a caM l4 and a sliding connecting piece 12, engages a rocker lever, shown symbolically at 7, which moves the exhaust valve member 2 downwardly (as shown in FIG. 1) to separate the valve member 2 from the valve seat 3 and thereby move the valve in the opening direction.
  • plunger rod 16 moves up the valve opens, while thelatter is closed by spring 4 acting on collar 5 when the rod moves down.
  • the decompression device comprises a decompression shaft 18 which is mounted at which is fixed relative to housing 10 so as to extend transversely in relation to the plunger rod 16, and a setting lever (not shown) is fastened to the end of this spindle where it projects from housing 10.
  • Shaft 18 is flattened at 18a by the provision of a milled out portion. Seated directly on this flattened portion in housing l0b which is also fixed relative to housing 10 is an abutment body 22 which represents the decompression stop and is loaded by a spring 28 and is movable.
  • the plunger rod 16 is able to move without obstruction to permit closing of the exhaust valve 2. If however, the shaft 18 is turned so that the cylindrical part of the surface thereof is opposite body 22 (FIGS. 2, 3 and 4), the cylindrical stop screw 30 strikes the abutment surface 220 during the downward movement of the plunger rod 16 and prevents the exhaust valve 2 from fully closing.
  • Abutment body 22 has an opening 22d through which the plunger rod 16 passes, and it also has'a flange 22a with a spherical opening 22b in which is guided a driving plunger 24.
  • the lower end 240 of the driving plunger 24 is in the form of a striker tooth which cooperates with teeth 20:; on the periphery of a driving plate 20. This latter is fastened to shaft 18.
  • the abutment screw 30 on the threaded portion 16a of the plunger rod 16 can be retained in its setting by means of a lock nut 32.
  • the decompression device described operates as follows:
  • the decompression device according to the invention comprises only a few constructional parts which do not move during the actual running of the machine and moreover are grouped in a compact arrangement associated with the valve-operating parts. Consequently the decompression device according to i this invention can be installed in all combustion engines without any difficulty and also built into finished engines.
  • a decompression device for selectively preventing full closing of an exhaust valve of an internal combustion engine comprising, in combination: a plunger rod for opening and closing the valve, a decompression cam and an abutment body, the decompression cam having a first position whereat it permits normal opening and closing of the valve and a second position whereat it moves the abutment body into the path of an operating member movable with the plunger rod.
  • a decompression cutoff means for automatically turning the decompression cam from said second position to said first position, said cutoff means comprising a plate turnable with the decompression cam and a driving plunger mounted in a resiliently yielding manner in said abutment body and movable in a direction generally parallel to the plunger rod, said driving plunger positioned to be engaged by the said operating member, when the decompression cam is in its second position, to act on the plate to turn the decompression cam towards its first position, before the movement of the operating member is limited by the abut ment body.
  • a decompression device according to claim 1 wherein the abutment body has a cylindrical part slidably mounted in a housing of the decompression device, and an arm which slidably engages around the plunger rod, and a flange part with a substantially spherical opening for the driving plunger.
  • a decompression device wherein a cylindrical abutment member is adjustably secured to the plunger rod, and wherein said abutment member cooperates both with the driving plunger for urging the same against the said plate, and also with an abutment surface of the abutment body for limiting movement of the abutment member and hence of the plunger rod.
  • a decompression device according to claim 3 wherein said decompression cam is a shaft having the plate fixed thereon and having a flattened portion for cooperating with the cylindrical part of the abutment.
  • a decompression device according to claim 4, wherein said plate has a plurality of teeth thereon and wherein said driving plunger acts on the plate to turn the same by one tooth during each cycle of movement of the plunger rod, until the plate, and hence the decompression shaft has reached the said first position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US801965A 1968-02-29 1969-02-25 Decompression device for internal combustion engine Expired - Lifetime US3548799A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681601973 DE1601973A1 (de) 1968-02-29 1968-02-29 Dekompressionsvorrichtung an Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3548799A true US3548799A (en) 1970-12-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
US801965A Expired - Lifetime US3548799A (en) 1968-02-29 1969-02-25 Decompression device for internal combustion engine

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US (1) US3548799A (enrdf_load_stackoverflow)
JP (1) JPS5030201B1 (enrdf_load_stackoverflow)
GB (1) GB1180000A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184468A (en) * 1977-06-23 1980-01-22 Hans List Decompression device for internal combustion engines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54107007U (enrdf_load_stackoverflow) * 1977-02-24 1979-07-27
JPS5889386U (ja) * 1981-12-11 1983-06-17 江浪　信良 グラスマツト入りフエルトペン

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4184468A (en) * 1977-06-23 1980-01-22 Hans List Decompression device for internal combustion engines

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Publication number Publication date
GB1180000A (en) 1970-02-04
JPS5030201B1 (enrdf_load_stackoverflow) 1975-09-30

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