GB2190139A - Rotary spool valve - Google Patents

Rotary spool valve Download PDF

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Publication number
GB2190139A
GB2190139A GB08610932A GB8610932A GB2190139A GB 2190139 A GB2190139 A GB 2190139A GB 08610932 A GB08610932 A GB 08610932A GB 8610932 A GB8610932 A GB 8610932A GB 2190139 A GB2190139 A GB 2190139A
Authority
GB
United Kingdom
Prior art keywords
combustion chamber
spool valve
seal
spool
housing
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.)
Withdrawn
Application number
GB08610932A
Other versions
GB8610932D0 (en
Inventor
Howard Brian Leitch
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB08610932A priority Critical patent/GB2190139A/en
Publication of GB8610932D0 publication Critical patent/GB8610932D0/en
Publication of GB2190139A publication Critical patent/GB2190139A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
    • F01L7/02—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped valves
    • F01L7/021—Rotary or oscillatory slide valve-gear or valve arrangements with cylindrical, sleeve, or part-annularly shaped valves with one rotary 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
    • F01L7/00—Rotary or oscillatory slide valve-gear or valve arrangements
    • F01L7/16—Sealing or packing arrangements specially 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
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

A spool 2 rotates at half crankshaft speed with inlet and exhaust ports arranged diagonally opposed through its long axis, and at an angle to each other about its circumference. A pressure assisted sprung combustion chamber seal 3 is provided to maintain compression. The timing of the entry and exit of combustion gases is effected by varying the port angles and sizes. <IMAGE>

Description

SPECIFICATION Rotary spool valve The invention relates to a rotary spool valve cylinder head for internal combustion engines.
The four stroke internal combustion engine is normally provided with a shaft running at half crankshaft speed opening and closing poppet valves to control the entry and exit of combustion gases.
The invention utilises a spool also rotating at half crankshaft speed, but with inlet and exhaust ports arranged diagonally opposed and at an angle to each other through the centre-line, sealed by means of a stepped circumference and sprung combustion chamber seal. This unique through the spool compound angle port orientation means the inlet and exhaust gases follow straight line paths, consequently, gas velocities are higher than poppet valve or conventional rotary valve cylinder heads.
A specific embodiment of the invention as would be fitted to a single cylinder four stroke engine will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows a section through the centre-line of the assembled rotary spool valve cylinder head at the point where the inlet port is fully open.
Figure 1. 1 shows the end view and hidden port detail at the above point. The retaining ring is not shown, (for clarity).
Figure 2 shows the assembly as in Fig. 1, but with the exhaust port fully open.
Figure 2.2 shows the end view and hidden port detail at this point.
Figure 3 shows the combustion chamber portseal in detail.
Note Spool drive, cylinder barrel, piston, carburettor/injection equipment, spark plug and other well-established mechanisms are not shown on drawings for reasons of clarity.
Referring to Fig. 1, the assembly comprises of a housing (1), a spool valve (2), combustion chamber seal (3), disc spring (4), and an end plate (5).
The housing (1) fulfils the following functions: (i) It forms the housing for the spool valve to run in; (ii) It forms the cylinder head and combustion chamber; (iii) It forms the three fixed ports, (inlet, exhaust, and combustion chamber); (iv) It is the mounting for the spark plug.
Into this housing the spool valve (2), combustion chamber seal (3), and disc spring (4), are fitted, the end plate (5) then being used to hold the spool valve in position. The spool valve is then driven by the crankshaft at half engine speed in typical fashion, (normally a chain and chainwheel assembly is used for this purpose). The spool valve port orientation, (see Fig. 1 & 2), is such that the inlet and exhaust ports are opened and closed alternately as with conventional valve arrangements. The time and duration of the openings may be varied to suit a particular engine by altering the port angles and sizes.
The spool also forms a seal between the combustion chamber and the atmosphere during the periods that the ports are closed. To facilitate this, the shaft and housing are stepped and a seal is provided at the combustion chamber fixed port. (Fig. 3 shows the combustion chamber seal in detail). The disc spring is placed in the housing so as to form a tight fit and the combustion chamber seal is placed on top where under spring pressure, it will press against the spool valve to form a seal. The orientation of the disc spring causes it to-exert an increased pressure on the combustion chamber seal, and consequently, on the spool valve during periods of high pressure in the combustion chamber. This effects an improved seal between the housing and the spool valve. The spring also allows auto magically for wear in the combustion chamber seal.
The lubrication, cooling, ignition mechanisms would be as would normally be provided to suit the particular engine application.
1. A four stroke internal combustion engine cylinder head using a spool rotating at half crankshaft speed with inlet and exhaust ports arranged diagonally opposed through its long axis and at an angle to each other about its circumference.
2. The rotary spool valve as claimed in (1) with a stepped spool and housing to provide improved gas sealing.
3. The rotary spool valve as claimed in (1) or (2) with a pressure assisted spring seal to seal the spool and the housing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Rotary spool valve The invention relates to a rotary spool valve cylinder head for internal combustion engines. The four stroke internal combustion engine is normally provided with a shaft running at half crankshaft speed opening and closing poppet valves to control the entry and exit of combustion gases. The invention utilises a spool also rotating at half crankshaft speed, but with inlet and exhaust ports arranged diagonally opposed and at an angle to each other through the centre-line, sealed by means of a stepped circumference and sprung combustion chamber seal. This unique through the spool compound angle port orientation means the inlet and exhaust gases follow straight line paths, consequently, gas velocities are higher than poppet valve or conventional rotary valve cylinder heads. A specific embodiment of the invention as would be fitted to a single cylinder four stroke engine will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows a section through the centre-line of the assembled rotary spool valve cylinder head at the point where the inlet port is fully open. Figure 1. 1 shows the end view and hidden port detail at the above point. The retaining ring is not shown, (for clarity). Figure 2 shows the assembly as in Fig. 1, but with the exhaust port fully open. Figure 2.2 shows the end view and hidden port detail at this point. Figure 3 shows the combustion chamber portseal in detail. Note Spool drive, cylinder barrel, piston, carburettor/injection equipment, spark plug and other well-established mechanisms are not shown on drawings for reasons of clarity. Referring to Fig. 1, the assembly comprises of a housing (1), a spool valve (2), combustion chamber seal (3), disc spring (4), and an end plate (5). The housing (1) fulfils the following functions: (i) It forms the housing for the spool valve to run in; (ii) It forms the cylinder head and combustion chamber; (iii) It forms the three fixed ports, (inlet, exhaust, and combustion chamber); (iv) It is the mounting for the spark plug. Into this housing the spool valve (2), combustion chamber seal (3), and disc spring (4), are fitted, the end plate (5) then being used to hold the spool valve in position. The spool valve is then driven by the crankshaft at half engine speed in typical fashion, (normally a chain and chainwheel assembly is used for this purpose). The spool valve port orientation, (see Fig. 1 & 2), is such that the inlet and exhaust ports are opened and closed alternately as with conventional valve arrangements. The time and duration of the openings may be varied to suit a particular engine by altering the port angles and sizes. The spool also forms a seal between the combustion chamber and the atmosphere during the periods that the ports are closed. To facilitate this, the shaft and housing are stepped and a seal is provided at the combustion chamber fixed port. (Fig. 3 shows the combustion chamber seal in detail). The disc spring is placed in the housing so as to form a tight fit and the combustion chamber seal is placed on top where under spring pressure, it will press against the spool valve to form a seal. The orientation of the disc spring causes it to-exert an increased pressure on the combustion chamber seal, and consequently, on the spool valve during periods of high pressure in the combustion chamber. This effects an improved seal between the housing and the spool valve. The spring also allows auto magically for wear in the combustion chamber seal. The lubrication, cooling, ignition mechanisms would be as would normally be provided to suit the particular engine application. CLAIMS
1. A four stroke internal combustion engine cylinder head using a spool rotating at half crankshaft speed with inlet and exhaust ports arranged diagonally opposed through its long axis and at an angle to each other about its circumference.
2. The rotary spool valve as claimed in (1) with a stepped spool and housing to provide improved gas sealing.
3. The rotary spool valve as claimed in (1) or (2) with a pressure assisted spring seal to seal the spool and the housing.
GB08610932A 1986-05-03 1986-05-03 Rotary spool valve Withdrawn GB2190139A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08610932A GB2190139A (en) 1986-05-03 1986-05-03 Rotary spool valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08610932A GB2190139A (en) 1986-05-03 1986-05-03 Rotary spool valve

Publications (2)

Publication Number Publication Date
GB8610932D0 GB8610932D0 (en) 1986-06-11
GB2190139A true GB2190139A (en) 1987-11-11

Family

ID=10597362

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08610932A Withdrawn GB2190139A (en) 1986-05-03 1986-05-03 Rotary spool valve

Country Status (1)

Country Link
GB (1) GB2190139A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0579903A1 (en) * 1992-07-20 1994-01-26 Miljenko Schiattino Double effect distribution sequential valve shaft
DE4302648A1 (en) * 1993-01-30 1994-08-11 Christoph Conradty Rotary slide valve
US5417188A (en) * 1992-07-20 1995-05-23 Schiattino; Miljenko Double effect distribution sequential valve shaft assembly
WO2001038705A1 (en) * 1999-11-25 2001-05-31 Dolmar Gmbh Four-stroke engine with rotary valve control
WO2008119198A1 (en) * 2007-04-02 2008-10-09 Re-Invest Suisse Gmbh Rotary valve for an internal combustion engine
ITPR20120060A1 (en) * 2012-10-03 2014-04-04 Marcello Marchi METHOD AND SYSTEM OF SUPPLY AND DISCHARGE OF INTERNAL COMBUSTION ENGINES AND ENGINE SO IT IS OBTAINED
ITTO20130315A1 (en) * 2013-04-19 2014-10-20 Ivan Guerrera Stylist TRACK-TYPE MOTOR-DRIVER WITHOUT THE ELBOW, CONNECTING SHAFT, CAMSHAFT, VALVES AND ROCKER ARMS
IT201900019922A1 (en) * 2019-10-29 2021-04-29 Saverio Violante COMBUSTION FLUID MANAGEMENT SYSTEM FOR A COMBUSTION ENGINE

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB471080A (en) * 1936-07-06 1937-08-27 Arthur Robie Sprowl Improvements in and relating to rotary valves for internal combustion engines
GB1496281A (en) * 1974-03-08 1977-12-30 Dana Corp Internal combustion engines
GB1600713A (en) * 1977-05-31 1981-10-21 Alto Automotive Inc Rotary operated slide valve arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB471080A (en) * 1936-07-06 1937-08-27 Arthur Robie Sprowl Improvements in and relating to rotary valves for internal combustion engines
GB1496281A (en) * 1974-03-08 1977-12-30 Dana Corp Internal combustion engines
GB1600713A (en) * 1977-05-31 1981-10-21 Alto Automotive Inc Rotary operated slide valve arrangement

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0579903A1 (en) * 1992-07-20 1994-01-26 Miljenko Schiattino Double effect distribution sequential valve shaft
US5417188A (en) * 1992-07-20 1995-05-23 Schiattino; Miljenko Double effect distribution sequential valve shaft assembly
DE4302648A1 (en) * 1993-01-30 1994-08-11 Christoph Conradty Rotary slide valve
WO2001038705A1 (en) * 1999-11-25 2001-05-31 Dolmar Gmbh Four-stroke engine with rotary valve control
US6694942B1 (en) 1999-11-25 2004-02-24 Dolmar Gmbh Four-stroke engine with rotary valve control
WO2008119198A1 (en) * 2007-04-02 2008-10-09 Re-Invest Suisse Gmbh Rotary valve for an internal combustion engine
ITPR20120060A1 (en) * 2012-10-03 2014-04-04 Marcello Marchi METHOD AND SYSTEM OF SUPPLY AND DISCHARGE OF INTERNAL COMBUSTION ENGINES AND ENGINE SO IT IS OBTAINED
ITTO20130315A1 (en) * 2013-04-19 2014-10-20 Ivan Guerrera Stylist TRACK-TYPE MOTOR-DRIVER WITHOUT THE ELBOW, CONNECTING SHAFT, CAMSHAFT, VALVES AND ROCKER ARMS
IT201900019922A1 (en) * 2019-10-29 2021-04-29 Saverio Violante COMBUSTION FLUID MANAGEMENT SYSTEM FOR A COMBUSTION ENGINE

Also Published As

Publication number Publication date
GB8610932D0 (en) 1986-06-11

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)