US3036566A - Internal combustion engines for powerdriven tools - Google Patents

Internal combustion engines for powerdriven tools Download PDF

Info

Publication number
US3036566A
US3036566A US74666A US7466660A US3036566A US 3036566 A US3036566 A US 3036566A US 74666 A US74666 A US 74666A US 7466660 A US7466660 A US 7466660A US 3036566 A US3036566 A US 3036566A
Authority
US
United States
Prior art keywords
casing
cavities
internal combustion
engine
halves
Prior art date
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
Application number
US74666A
Inventor
Dobbertin Gunther Hein Wilhelm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BERGBORRMASKINER AB
Original Assignee
BERGBORRMASKINER AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BERGBORRMASKINER AB filed Critical BERGBORRMASKINER AB
Priority to US74666A priority Critical patent/US3036566A/en
Application granted granted Critical
Publication of US3036566A publication Critical patent/US3036566A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S123/00—Internal-combustion engines
    • Y10S123/03—Model

Definitions

  • the present invention relates to internal combustion engines for powerdriven tools, such as portable saws, and more specifically to engines of this kind having a casing which is made in two halves.
  • the casing is divided into two halves along a substantially medial plane which form the supporting structure of the engine and these halves are formed with cavities which are open towards that side of each casing half which faces the other casing half, said cavities either forming the engine crank case and a fuel container or forming a space for receiving such elements.
  • the casing halves may further be provided with cavities forming a lubricant container or a space for receiving such container.
  • FIG. 1 is a cross-sectional view of a casing according to the invention for the engine of a power-driven saw;
  • FIG. 2 is a longitudinal section taken through that plane along which the casing is divided into two halves (i.e. along line II-II in FIG. 1 and also IIII in FIG.
  • FIG. 3 is a longitudinal section taken along the line IIIIII in FIG. 1;
  • FIG. 4 is a side view of the portable saw, partly broken and drawn to a smaller scale.
  • FIGS. 1 and 3 designate the two halves of a motor casing divided along the plane indicated by IIII in FIGS. 1 and 3 which is substantially the medial plane of the composite casing.
  • a cover placed over the interconnected casing halves is indicated at 3.
  • the casing is further provided at one end with a handle 4 which in the embodiment shown is likewise composed by two halves each made in one piece with one of the casing halves 1 and 2.
  • a carrying yoke 5 To that end of the casing which is opposite the handle 4 there is attached a carrying yoke 5.
  • FIG. 2 shows the casing half I seen from the dividing plane (IIII in FIGS. 1 and 3).
  • the casing half 1 is formed with cavities 6, 7 and 8 which are open at the side facing the dividing plane, and the other casing half 2 is provided with corresponding cavities 106, 107 and 108 likewise open towards the dividing plane and disposed opposite the cavities 6, 7 and 8, respectively, in the casing half 1.
  • the cavities 6 and 106 together form a space for the cylinder 9 of the engine.
  • the engine crank case is formed by the cavities 7 and 107.
  • a recess 10 in the partition wall between the cavities 6 and 7 of easing half 1 and a correspondingly disposed recess 110 in the easing half 2 together form an opening for the piston rod 11.
  • the engine is a two-stroke carburettor engine with the crank case adapted as the scavenging pump.
  • the carburettor 12 shown in broken lines in FIGS. 1 and 2 is mounted in the space under the cover 3 over an inlet port 13 communicating via a passage 14 with the crank case formed by the cavities 7 and 107.
  • Both containers are preferably made from a plastic material, and, as can be seen from FIG. 2, the lubricant container 16 is fitted between the fuel container 15 and the wall separating the space 8, 108 enclosing said containers from the crank case 7, 107, so as to protect the fuel container 15 from the heat emanating from the crank case.
  • 17 and 18 indicate filler caps for the fuel and lubricant containers 15 and 16, respectively, said caps being arranged in the side wall of casing half 2.
  • a flexible hose 19 connecting the fuel container 15 with the carburettor 12 has a portion extending into the container and provided at its free end with a filter 20 which also serves as a weight for moving the intake end of the hose towards the lowest part of the fuel container when the saw is turned into different positions.
  • the lubricant container 16 is likewise provided with a flexible hose 21 having a filter 22 at its free end. The opposite end of the hose connects to an oil pump or the like not shown in the drawings.
  • each of the cavities 7, 107 forming the crank case is provided with a depressed portion 23 and 123 respectively (FIG. 1), for receiving ball bearings for the crank shaft 24 which is passed through central openings 25 and 125, respectively, in said depressed portions.
  • the space 26 between the cavities and the outer side wall of the casing half contains a clutch 27 on the end of the crank shaft 24 for transmitting the crank shaft rotary movement to the saw chain.
  • the saw chain and its drive means do not form any part of the present invention and are therefore not shown in the drawings.
  • the opposite end portion of the crank shaft 24 projects into a space 28 in the casing half 2 between the outer side wall and the cavities thereof and carries a fan wheel 29 for blowing cooling air to the cylinder-containing space 6, 106' which communicates with the space 28.
  • the casing halves 1 and 2 may equally well be formed with separate cavities for separately receiving the two containers.
  • the containesr may be made of any suitable material, such as sheet metal or the like. It is further possible, by connecting the two casing halves in a fluid-tight manner, to let the spaces formed by such cavities directly serve as containers for the fuel and lubricant. Further the cavities forming the crank case may be shaped for receiving a separately formed crank case unit.
  • An internal combustion engine for portable powerdriven tools and the like comprising a casing enclosing said engine and forming the supporting structure thereof, said casing being divided into two halves along a substantially medial plane, each of said halves having cavities formed therein which are open towards said plane, said cavities forming the engine crank case and a fuel container.
  • An internal combustion engine for portable powerdriven tools and the like comprising a casing enclosing said engine and forming the supporting structure thereof, said casing being divided into two halves along a substantially medial plane, each of said halves having cavities formed therein which are open towards said plane, said cavities forming the engine crank case and a space for receiving a fuel container.
  • An internal combustion engine for portable powerdriven tools and the like comprising a casing enclosing said engine and forming the supporting structure thereof, said casing being divided into two halves along a substantially medial plane, each of said halves having cavities formed therein which are open towards said plane, said cavities forming the engine crank case, a space for receiving a fuel container and a space for receiving a lubricant container.
  • An internal combustion engine for portable powerdriven tools and the like comprising a casing enclosing said engine and forming the supporting structure thereof, said casing being divided into two halves along a substantially medial plane, each of said halve having cavities formed therein which are open towards said plane, said cavities forming the engine crank case and a space adjacent thereto for receiving a fuel container and a lubricant container both made of plastic material, said lubricant container being disposed between said crank case forming space and said fuel container.

Description

INTERNAL COMBUSTION ENGINES FOR POWER-DRIVEN TOOLS Filed Dec 8, 1960 May 29, 1962 v G, H. w. DOBBERTIN 3 Sheets-Sheet l INVENTO R. GUN TH E R HEINRICH W/LHHM DOBBERTIM w M A TTO R N E YS y 9, 1962 c, H. w. DOBBERTlN 3,036,566
INTERNAL COMBUSTION ENGINES FOR POWER-DRIVEN TOOLS Filed Dec. 8, 1960 3 SheetsSheet 2 INVENTOR GUN'HgR HElNRiCH WILHELM DOBBERTIN ATTORNEY INTERNAL COMBUSTION ENGINES FOR POWER-DRIVEN TOOLS May 29, 1962 G. H. w. DOBBERTIN Filed Dec.
3 Sheets-Sheet 3 INVENTOR GUNTHER HHNRICH WILHHM DOBBERTIN BY M /M ATTORNEYS United States Patent Gfjice 3,036,566 Patented May 29, 1962 3,036,566 INTERNAL COMBUSTION ENGINES FOR I'GWER- DRIVEN TOOLS Gunther Heinrich Wilhelm Dobbertin, Gothenburg,
Sweden, assiwor to Aktiebolaget Berghorrmaskiner,
Gunnebogatan, Molndal, Sweden Filed Dec. 8, 1960, Ser. No. 74,666 Claims. (Cl. 123-195) The present invention relates to internal combustion engines for powerdriven tools, such as portable saws, and more specifically to engines of this kind having a casing which is made in two halves.
It is an object of the invention to provide a rugged engine of this type which is of comparatively simple design and therefore can be produced at a low cost.
In an engine according to the invention the casing is divided into two halves along a substantially medial plane which form the supporting structure of the engine and these halves are formed with cavities which are open towards that side of each casing half which faces the other casing half, said cavities either forming the engine crank case and a fuel container or forming a space for receiving such elements.
According to the invention, the casing halves may further be provided with cavities forming a lubricant container or a space for receiving such container.
Further objects and features of the invention will appear from the following detailed description of a preferred embodiment, applied to a portable power-driven saw, reference being had to the accompanying drawings, wherein:
FIG. 1 is a cross-sectional view of a casing according to the invention for the engine of a power-driven saw;
FIG. 2 is a longitudinal section taken through that plane along which the casing is divided into two halves (i.e. along line II-II in FIG. 1 and also IIII in FIG.
FIG. 3 is a longitudinal section taken along the line IIIIII in FIG. 1; and
FIG. 4 is a side view of the portable saw, partly broken and drawn to a smaller scale.
In the drawings 1 and 2 designate the two halves of a motor casing divided along the plane indicated by IIII in FIGS. 1 and 3 which is substantially the medial plane of the composite casing. A cover placed over the interconnected casing halves is indicated at 3. The casing is further provided at one end with a handle 4 which in the embodiment shown is likewise composed by two halves each made in one piece with one of the casing halves 1 and 2. To that end of the casing which is opposite the handle 4 there is attached a carrying yoke 5.
FIG. 2 shows the casing half I seen from the dividing plane (IIII in FIGS. 1 and 3). The casing half 1 is formed with cavities 6, 7 and 8 which are open at the side facing the dividing plane, and the other casing half 2 is provided with corresponding cavities 106, 107 and 108 likewise open towards the dividing plane and disposed opposite the cavities 6, 7 and 8, respectively, in the casing half 1. The cavities 6 and 106 together form a space for the cylinder 9 of the engine. The engine crank case is formed by the cavities 7 and 107. A recess 10 in the partition wall between the cavities 6 and 7 of easing half 1 and a correspondingly disposed recess 110 in the easing half 2 together form an opening for the piston rod 11. In the example shown in the drawings, the engine is a two-stroke carburettor engine with the crank case adapted as the scavenging pump. The carburettor 12, shown in broken lines in FIGS. 1 and 2 is mounted in the space under the cover 3 over an inlet port 13 communicating via a passage 14 with the crank case formed by the cavities 7 and 107.
The cavities 8 and 108 in the two casing halves 1 and 2, respectively, together form a space receiving a fuel container 15 and a container 16 for a lubricant for lubrication of the saw chain (not shown). Both containers are preferably made from a plastic material, and, as can be seen from FIG. 2, the lubricant container 16 is fitted between the fuel container 15 and the wall separating the space 8, 108 enclosing said containers from the crank case 7, 107, so as to protect the fuel container 15 from the heat emanating from the crank case. In FIG. 4, 17 and 18 indicate filler caps for the fuel and lubricant containers 15 and 16, respectively, said caps being arranged in the side wall of casing half 2. A flexible hose 19 connecting the fuel container 15 with the carburettor 12 has a portion extending into the container and provided at its free end with a filter 20 which also serves as a weight for moving the intake end of the hose towards the lowest part of the fuel container when the saw is turned into different positions. The lubricant container 16 is likewise provided with a flexible hose 21 having a filter 22 at its free end. The opposite end of the hose connects to an oil pump or the like not shown in the drawings.
The bottom of each of the cavities 7, 107 forming the crank case is provided with a depressed portion 23 and 123 respectively (FIG. 1), for receiving ball bearings for the crank shaft 24 which is passed through central openings 25 and 125, respectively, in said depressed portions. In the casing half 1 the space 26 between the cavities and the outer side wall of the casing half contains a clutch 27 on the end of the crank shaft 24 for transmitting the crank shaft rotary movement to the saw chain. The saw chain and its drive means do not form any part of the present invention and are therefore not shown in the drawings. The opposite end portion of the crank shaft 24 projects into a space 28 in the casing half 2 between the outer side wall and the cavities thereof and carries a fan wheel 29 for blowing cooling air to the cylinder-containing space 6, 106' which communicates with the space 28.
Although the fuel and lubricant containers 15 and 16, respectively, have been described above as arranged within a common compartment formed by the cavities 8 and 108, the casing halves 1 and 2 may equally well be formed with separate cavities for separately receiving the two containers. Also the containesr may be made of any suitable material, such as sheet metal or the like. It is further possible, by connecting the two casing halves in a fluid-tight manner, to let the spaces formed by such cavities directly serve as containers for the fuel and lubricant. Further the cavities forming the crank case may be shaped for receiving a separately formed crank case unit. Other variations and modifications are of course conceivable within the scope of the invention which is not limited to the embodiment hereinbefore described and shown in the accompanying drawings.
What I claim is:
1. An internal combustion engine for portable powerdriven tools and the like, comprising a casing enclosing said engine and forming the supporting structure thereof, said casing being divided into two halves along a substantially medial plane, each of said halves having cavities formed therein which are open towards said plane, said cavities forming the engine crank case and a fuel container.
2. An internal combustion engine for portable powerdriven tools and the like, comprising a casing enclosing said engine and forming the supporting structure thereof, said casing being divided into two halves along a substantially medial plane, each of said halves having cavities formed therein which are open towards said plane, said cavities forming the engine crank case and a space for receiving a fuel container.
3. An internal combustion engine for portable powerdriven tools and the like, comprising a casing enclosing said engine and forming the supporting structure thereof, said casing being divided into two halves along a substantially medial plane, each of said halves having cavities formed therein which are open towards said plane, said cavities forming the engine crank case, a space for receiving a fuel container and a space for receiving a lubricant container.
4. An internal combustion engine as claimed in claim 3, wherein said fuel and lubricant containers are made of plastic material.
5. An internal combustion engine for portable powerdriven tools and the like, comprising a casing enclosing said engine and forming the supporting structure thereof, said casing being divided into two halves along a substantially medial plane, each of said halve having cavities formed therein which are open towards said plane, said cavities forming the engine crank case and a space adjacent thereto for receiving a fuel container and a lubricant container both made of plastic material, said lubricant container being disposed between said crank case forming space and said fuel container.
References Cited in the file of this patent UNITED STATES PATENTS 2,479,750 Lewandowski Aug. 23, 1949 FOREIGN PATENTS 809,267 Germany July 26, 1951
US74666A 1960-12-08 1960-12-08 Internal combustion engines for powerdriven tools Expired - Lifetime US3036566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US74666A US3036566A (en) 1960-12-08 1960-12-08 Internal combustion engines for powerdriven tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74666A US3036566A (en) 1960-12-08 1960-12-08 Internal combustion engines for powerdriven tools

Publications (1)

Publication Number Publication Date
US3036566A true US3036566A (en) 1962-05-29

Family

ID=22120911

Family Applications (1)

Application Number Title Priority Date Filing Date
US74666A Expired - Lifetime US3036566A (en) 1960-12-08 1960-12-08 Internal combustion engines for powerdriven tools

Country Status (1)

Country Link
US (1) US3036566A (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3204619A (en) * 1962-07-02 1965-09-07 American Mach & Foundry Internal combustion engine
US3224473A (en) * 1962-04-03 1965-12-21 Dobbertin Gunther Hein Wilhelm Portable engine-driven chain saws
DE1266049B (en) * 1963-10-02 1968-04-11 Briggs & Stratton Corp Air-cooled single-cylinder internal combustion engine
US3964462A (en) * 1974-12-10 1976-06-22 Hans List Sound-proofed internal combustion engine
JPS524919U (en) * 1975-06-24 1977-01-13
US4117823A (en) * 1975-12-13 1978-10-03 Honda Giken Kogyo Kabushiki Kaisha Air sucking device for engines
USRE29923E (en) * 1974-05-20 1979-03-06 Hans List Sound-proofed internal combustion engine
DE2945667A1 (en) * 1979-11-12 1981-05-21 Jonsereds Fabrikers Ab Motor housing for portable chain-saw - has integral chambers for lubricating oil and fuel formed by internal partitions
FR2475625A1 (en) * 1980-02-09 1981-08-14 Solo Kleinmotoren Gmbh COMBINED APPARATUS COMPRISING A WORKING DEVICE AND A COMBUSTION ENGINE
US4285309A (en) * 1979-11-13 1981-08-25 Jonsereds Aktiebolag Housing for an internal combustion engine
US4286675A (en) * 1979-06-25 1981-09-01 Beaird-Poulan Division Of Emerson Electric Co. Narrow profile power handle for line trimmer and the like
JPS6045865U (en) * 1983-09-07 1985-03-30 株式会社共立 Tank for portable work equipment
US4517939A (en) * 1981-06-19 1985-05-21 Komatsu Zenoah Co. Dust collecting device
US4700480A (en) * 1984-10-05 1987-10-20 Ab Electrolux Base structure of a motor saw
US4892164A (en) * 1987-03-04 1990-01-09 Yamaha Hatsuodoki Kabushiki Kaisha Frame and body construction for small snowmobile
AU597040B2 (en) * 1986-03-14 1990-05-24 Aktiebolaget Electrolux Arrangement in an air-cooled I.C. engine
US4979306A (en) * 1989-01-17 1990-12-25 Kioritz Corporation Power working machine
FR2707342A1 (en) * 1993-07-06 1995-01-13 Honda Motor Co Ltd Work machine, especially agricultural.
US5738064A (en) * 1995-11-15 1998-04-14 Wci Outdoor Products, Inc. Vibration weld chassis assembly
JP2010116887A (en) * 2008-11-14 2010-05-27 Hitachi Koki Co Ltd Engine tool

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479750A (en) * 1946-02-07 1949-08-23 Frank B Lewandowski Hand drill
DE809267C (en) * 1950-01-03 1951-07-26 Nsu Werke A G Internal combustion engine for two-wheeled motorcycles or the like.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479750A (en) * 1946-02-07 1949-08-23 Frank B Lewandowski Hand drill
DE809267C (en) * 1950-01-03 1951-07-26 Nsu Werke A G Internal combustion engine for two-wheeled motorcycles or the like.

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224473A (en) * 1962-04-03 1965-12-21 Dobbertin Gunther Hein Wilhelm Portable engine-driven chain saws
US3204619A (en) * 1962-07-02 1965-09-07 American Mach & Foundry Internal combustion engine
DE1266049B (en) * 1963-10-02 1968-04-11 Briggs & Stratton Corp Air-cooled single-cylinder internal combustion engine
USRE29923E (en) * 1974-05-20 1979-03-06 Hans List Sound-proofed internal combustion engine
US3964462A (en) * 1974-12-10 1976-06-22 Hans List Sound-proofed internal combustion engine
JPS524919U (en) * 1975-06-24 1977-01-13
JPS5342650Y2 (en) * 1975-06-24 1978-10-14
US4117823A (en) * 1975-12-13 1978-10-03 Honda Giken Kogyo Kabushiki Kaisha Air sucking device for engines
US4286675A (en) * 1979-06-25 1981-09-01 Beaird-Poulan Division Of Emerson Electric Co. Narrow profile power handle for line trimmer and the like
DE2945667A1 (en) * 1979-11-12 1981-05-21 Jonsereds Fabrikers Ab Motor housing for portable chain-saw - has integral chambers for lubricating oil and fuel formed by internal partitions
US4285309A (en) * 1979-11-13 1981-08-25 Jonsereds Aktiebolag Housing for an internal combustion engine
FR2475625A1 (en) * 1980-02-09 1981-08-14 Solo Kleinmotoren Gmbh COMBINED APPARATUS COMPRISING A WORKING DEVICE AND A COMBUSTION ENGINE
US4517939A (en) * 1981-06-19 1985-05-21 Komatsu Zenoah Co. Dust collecting device
JPS6045865U (en) * 1983-09-07 1985-03-30 株式会社共立 Tank for portable work equipment
JPH0124367Y2 (en) * 1983-09-07 1989-07-24
US4700480A (en) * 1984-10-05 1987-10-20 Ab Electrolux Base structure of a motor saw
AU597040B2 (en) * 1986-03-14 1990-05-24 Aktiebolaget Electrolux Arrangement in an air-cooled I.C. engine
US4892164A (en) * 1987-03-04 1990-01-09 Yamaha Hatsuodoki Kabushiki Kaisha Frame and body construction for small snowmobile
US4979306A (en) * 1989-01-17 1990-12-25 Kioritz Corporation Power working machine
FR2707342A1 (en) * 1993-07-06 1995-01-13 Honda Motor Co Ltd Work machine, especially agricultural.
US5738064A (en) * 1995-11-15 1998-04-14 Wci Outdoor Products, Inc. Vibration weld chassis assembly
JP2010116887A (en) * 2008-11-14 2010-05-27 Hitachi Koki Co Ltd Engine tool

Similar Documents

Publication Publication Date Title
US3036566A (en) Internal combustion engines for powerdriven tools
US5029393A (en) Chain saw
US3204619A (en) Internal combustion engine
US4393589A (en) Construction for a motor-driven chain saw
KR850004307A (en) Muffler for motor compressor
GB1226307A (en)
US4727651A (en) Chain saw
US2821174A (en) Appliance for the ventilation of the crankcase of internal combustion engines
US5063897A (en) Accessory drive arrangement for engine
US5174257A (en) Balancer shaft for two cycle engine
US3372718A (en) Chain saw
JP3556905B2 (en) Air-cooled internal combustion engines, especially single cylinder diesel engines, having a crankshaft rotating about a vertical axis
US2246446A (en) Internal combustion engine
US3800753A (en) Drainage system for internal combustion engine having a horizontally disposed crankshaft
US4934345A (en) Two-cycle internal combustion engine
JPS5996414A (en) Engine unit in vehicle such as motorcycle
US3045898A (en) Welded sheet metal casings
US3227146A (en) Two-stroke internal combustion engine
JPH0119045B2 (en)
JPS6321362Y2 (en)
JP2001263033A (en) Lubricating device for hand held type 4-cycle engine
US2575859A (en) Housing means for rock drilling machines
US1094431A (en) Gas-engine.
US2875739A (en) Camshaft drive for internal combustion engines
US3765393A (en) Lubrication of two-cycle engine gearbox