JPH05214909A - Rotary valve type four-cycle gasoline engine - Google Patents

Abstract

PURPOSE:To maintain sure airtightness with a simple structure and improve reliability by rotating the notch of a rotary valve means provided at an intersection of three passages of a cylinder head, and selectively communicating a combustion chamber to an intake passage and an exhaust passage in turn. CONSTITUTION:A notch 1511 is provided on a valve member 1510, and the sliding contact areas on the belly side of the notch 1511 and on the opposite back side differ from each other. The valve member 1510 is brought into contact with a sliding member 1520 on the back side of the notch 1511 in the compression and explosion strokes when the pressure of a combustion chamber 7 becomes high, and on the belly side of the notch 1511 in the suction and exhaust strokes when the pressure of the combustion chamber 7 becomes low. The airtightness of the combustion chamber 7 is maintained by the airtight action of an oil film held in a gap 1523a between the inner wall of a sliding member hole 3a and the cylinder outer periphery 1523 of the sliding member 1520 and the airtight action of an oil film held in a sliding gap 1522a, between the cylinder outer periphery of the valve member 1510 and the sliding cylinder face 1522 of the sliding member 1520.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION A valve means is provided at an intersection of three passages which are a passage leading to a combustion chamber of an engine, an intake passage and an exhaust passage, and the combustion chamber is connected to the intake passage and the exhaust passage through the valve means. The present invention relates to a four-cycle gasoline engine equipped with rotary valve means which is suitable for an engine configured to switch and communicate with each other and which has rotary valve means having improved durability and airtightness of a rotary sliding portion.

[0002]

2. Description of the Related Art Valve means is provided at an intersection of three passages of a combustion chamber of an engine, an intake passage and an exhaust passage, and the combustion chamber is switched to communicate with the intake passage and the exhaust passage through the valve means. The engine is known as a small gasoline engine for motorcycles, for example. The first conventional example is shown in FIGS.
Explained by. FIG. 5 is a view showing a main part of a conventional engine, FIG. 6 is a cross-sectional view of a main part of a conventional valve means, and FIG. 7 is a cross-sectional view of a conventional valve member. In the figure, 100 is an institution. Reference numeral 1 is a cylinder, 2 is a crank case, 3 is a cylinder head, 4 is a piston, 5 is a crank shaft, 6 is a connecting rod, 7 is a combustion chamber, and 8 is a crank chamber, all of which are known elements of an internal combustion engine. A rotary valve means 15 comprises a valve member, a seal member and a bearing member. Reference numeral 152 denotes a seal member, which has a thin cylindrical shape and is fitted into a hole formed in the cylinder head 3. Reference numeral 151 denotes a valve member, which is a hollow cylinder and is divided into left and right by a partition wall of a complicated shape in the central portion.
It is slidably fitted in 52. Reference numeral 151a denotes an intake passage, which is a portion on the left side of the partition wall inside the valve member 151 in the drawing. Reference numeral 151b denotes an exhaust passage, which is a portion on the right side of the partition wall inside the valve member 151 in the figure.

Reference numeral 151aa is a hollow portion which is a tubular portion on the left side of the intake passage 151a. Reference numeral 151ab is a hole which is a radial opening and is formed in the outer wall of the hollow portion 151aa on the side of the partition wall. 151ba is a hollow portion which is a tubular portion on the right side of the exhaust passage 151b. 151bb is an opening in the radial direction and is the exhaust passage 15
1b is a hole formed in the outer wall of the partition side end and has the same shape as the radial opening 151ab but the same axial position but different circumferential position. Reference numeral 22 denotes a passage, which is a hole provided in the cylinder head 3 and communicates directly above the combustion chamber 7 with radial openings 151ab, 1ab.
It is provided at a position that can match 51bb. The seal member 152 is provided with a hole corresponding to the passage 22. Two
Reference numeral 00 is a drive means which comprises a drive gear pair, a passive gear pair and a power transmission shaft. Reference numeral 230 denotes a driving gear pair which is a bevel gear, one gear is attached to the crankshaft 5, and the other gear is the motion transmission shaft 220.
Installed at the end of. Reference numeral 210 denotes a passive gear pair which is a bevel gear, one of which is attached to the end of the power transmission shaft 220 and the other of which is attached to the end of the valve member 151.

The operation of the first conventional example will be described. The movement of the piston 4 is transmitted to the crankshaft 5 in a rotational movement by the connecting rod 6, and the rotation of the crankshaft 5 is driven by the drive gear pair 230, the power transmission shaft 220, and the passive gear pair 21.
0 is transmitted to the valve member 151 and the valve member 151 rotates about its axis. The rotation of the valve member 151 is synchronized with the movement of the piston 4, so that the radial openings 151ab and 151bb are alternately synchronized with the movement of the piston 4 into the passage 22 because the gear ratio of the gear pair is properly set. In accordance with this, the combustion chamber 7 communicates with the intake passage 26 or the exhaust passage 25, so that intake, compression, explosion expansion, and exhaust operations are performed in the combustion chamber 7. The seal member 152 maintains airtightness between the cylinder head 3 and the valve member 151. The second conventional example is shown in FIG.
11 will be described. In order to simultaneously maintain the movement and airtightness between both members, one of which is rotating and the other is fixed, it is essential to form an appropriate gap and a lubricating oil film. However, in the first conventional example, the axial center portion of the valve member 151 is used. However, since the exhaust gas of high temperature passes through intermittently, the temperature becomes high and the valve member 151 undergoes thermal expansion which fluctuates according to the engine load, and the gap fluctuates. It is not always easy to properly maintain the gap between the valve member 151 and the seal member 152 regardless of fluctuations in the engine load, and to maintain the lubrication and airtightness of the portion.

One example of means for realizing this is Japanese Patent Laid-Open No. 59-59.
No. 103911. In the figure, 011 is a cylinder head, 12 is a piston, 13 is a cylinder, 14
Are combustion chambers, all of which are known elements of internal combustion engines. 10 is a valve assembly consisting of several parts. Reference numeral 15 is a rotating body, which is an element of the valve assembly 10 and is cylindrical and is bored inward and rotates about an axis. Reference numeral 16 is a suction passage, which is a hole formed in the rotating body 15. Reference numeral 17 denotes an exhaust passage, which is a hole formed in the rotating body 15 so as not to communicate with the intake passage 16. Reference numeral 19 is a head port, which is a combustion chamber 1 opened in the cylinder head 011.
It is a hole leading to 4.

20 is a seal assembly consisting of several parts. Reference numeral 21 denotes a lower housing, and a part 022 of the seal assembly 20 is an upper housing, which is a part of the seal assembly 20. Reference numeral 023 denotes a split housing, which is the lower housing 21.
And an upper housing 022. Reference numeral 27 denotes a rotary member seal, which is a thin cylindrical member provided inside the split housing 023. A bearing 34 is provided on the cylinder head 11 to support the rotating body 15. An elastic seal 36 is provided on the head port 19. The intake passage 16 and the exhaust passage 17 end on the circumferential surface of the rotating body 15 in the longitudinal direction, and two rotating body ports 43 and 44 are formed therein. The rotor ports 43 and 44 are angularly separated about the axis of the rotor 15 so as to alternately communicate with the head ports 19 extending from the combustion chamber 14. The intake passage 16 and the exhaust passage 17 control the flow of fuel to the combustion chamber 14 and the flow of expanded exhaust gas from the combustion chamber 14. During operation of the valve assembly 10, the rotor 15 rotates about the longitudinal axis so that the intake passage 16 and the exhaust passage 17 are alternately brought into communication with the combustion chamber 14 in synchronism with the movement of the piston 12. .. The valve assembly 10 further includes a seal assembly 20 shown in exploded view in FIG.

The seal assembly 20 includes a split housing 023 composed of a lower housing 21. The lower housing 21 cooperates with the upper housing 022 to have a substantially circular hollow portion rotatably accommodating the substantially cylindrical rotating body 15. 26 is formed. Also, the lower housing 21 and the upper housing 022
Cooperate to form a cube, the end faces of which are separated by a gap 51. The split housing 023 further includes a bolt 24. The bolt 24 is combined with a spring to integrally fix the lower housing 21 and the upper housing 022 as a supporting member and bias them toward the rotating body 15. The lower housing 21 has a head port 1 extending from the combustion chamber 14.
9 is formed. The circular hollow portion 26 includes a substantially cylindrical surface 2 of the lower housing 21 and the upper housing 022.
A hollow rotary body seal 27, which is in the form of a sleeve and is supported by 8 and 29, is placed. Since the lower housing 21 and the upper housing 022 are spring together, the rotor seal 27 is biased to form a generally cylindrical contour that matches the cylindrical outer surface of the rotor 15. The seal assembly 20 is the combustion chamber 1
4 acts as a seal to keep the combustion gases in.

The rotating body 15 is supported by bearings 34,
The rotor seal 27 sealingly engages the surface of the rotor 15. Therefore, the rotor seal 27 forms an effective seal around the rotor 15 to prevent oil from flowing into the combustion chamber 14, and also allows entry and exit through the intake passage 16 and the exhaust passage 17. Prevents the flow of gas through the valve assembly 10. This is achieved by the pressure exerted on the surface of the rotor 15 and the inner surface of the rotor seal 27 in the region near the head port 19. First, the pressure is applied to the flat surface 4 of the lower housing 21.
8 is transmitted to its inner surface 28 and then to the outer surface of the rotor seal 27. Combustion chamber 14
Said pressure, which is roughly proportional to the pressure of the gas inside, is created by: (A) Force transmitted through the lower portion of the lower housing 21 generated by the combustion gas pressure acting on the region 48 (see FIG. 11) (b) Deformation of the elastic seal 36, (c) Preload applied by the spring 25 ..

The split housing 023 is a cylinder head 0.
It is placed in an empty space 45 provided in 11 and extending from the combustion chamber 14. The split housing 023 has a gap 35 around it to allow self-alignment and movement of the seal assembly 20 with respect to the cylinder head 011. Since the split housing 023 has a flexible edge portion, the split housing 023 sealingly engages with the cylinder head 011 by an elastic seal 36 having a substantially V-shaped cross section along the longitudinal direction. The elastic seal 36 includes the cylinder head 011 and the lower housing 2.
Lower housing 2 while maintaining a sealing contact with 1.
1 and the upper housing 022 are allowed to oscillate and change the gap due to thermal expansion. In use, the elastic seal 36 elastically deforms and the edges are biased to engage the cylinder head 011 and the lower housing 21. Under high pressure, the edge is pushed outward and the cylinder head 01
The sealing contact between 1 and the lower housing 21 is strengthened. Preferably, the elastic seal 36 should be machined from a single piece of refractory alloy steel having edges that taper toward the inner end. An elastic seal 36 having a relatively small diameter is provided between the cylinder head 011 and the lower housing 21.
By reducing the area 48 of the lower housing 21 that is exposed to the combustion chamber 14 by the provision of, the force exerted by the combustion gases on the rotor 15 can be reduced.

[0010]

The greatest difficulty of the above-mentioned prior art is that the seal assembly is assembled in one body with a rotary seal having a circular cross section sandwiched between thick plate-shaped split housings having a rectangular cross section and attached to a cylinder head. Therefore, the structural complexity for sealing the both side surfaces of the split housing is caused, and the engine performance is deteriorated due to gas blow-through due to imperfect sealing. An object of the present invention is to solve the above-mentioned problems and to provide a rotary type valve means having a simple structure and reliable airtightness, thereby providing a highly reliable, lightweight and practical gasoline engine of low cost.

[0011]

According to a first aspect of the present invention, a cylinder head of an engine is provided with a passage communicating with a combustion chamber, an intake passage, and an exhaust passage, and an intersection of the three passages is orthogonal to a passage leading to the combustion chamber. In an engine configured to provide a hole for opening, a rotary valve means in the hole, and to switch and communicate the combustion chamber with the intake passage and the exhaust passage through the rotational movement of the valve means: A valve member which is a columnar member and which has a substantially crescent-shaped notch in a radial direction over a part of a longitudinal direction intersecting a passage communicating with the combustion chamber;
A sliding member provided at a cylinder head, one end of which forms a cylindrical surface capable of sliding contact with the outer surface of the valve member, the inner wall of which surrounds the passage, and which is slidable in the longitudinal direction along the passage. An elastic member provided at the other end of the sliding member. A second invention is characterized in that the sliding member of the first invention is made of oil-containing sintered metal as a raw material.

[0012]

When the valve member rotates, the notch rotates to alternately switch the passage communicating with the combustion chamber to the intake passage and the exhaust passage. The sliding member is subjected to the force due to the gas pressure in the combustion chamber and the force due to the elastic member from the combustion chamber side to the columnar valve member, and the force due to the elastic member always acts regardless of the pressure inside the combustion chamber. When the pressure in the combustion chamber during the compression and explosion stroke is high and the force acting on the sliding member is large, the cylindrical valve member makes sliding contact with the mating member on the back side of the notch due to the opening timing, so a large sliding contact area is created. The obtained airtightness is maintained.
When the pressure in the combustion chamber during the intake and exhaust strokes is low and the force acting on the sliding member is small, the cylindrical valve member makes sliding contact with the mating member on the antinode side of the notch, but the sliding contact area is small, but the sliding contact area is small. The load acting on the moving surface is predominantly small due to the force of the elastic member. During this period, the supply of lubricating oil and the retention of the oil film are performed to prepare for lubrication and airtightness maintenance under high pressure. Oil is supplied to the sliding portion by the lubricating oil supplied into the intake air during the intake stroke in which the intake air passes through the passage through the notch. In this way, the rotary valve means ensures the airtightness of the sliding portion and the retention of the oil film when controlling intake / exhaust with a simple structure. If the sliding member is made of an oil-containing sintered metal, the oil film can be held reliably, and the above-described action can be achieved more effectively.

[0013]

EXAMPLES Examples will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the essential parts of an engine equipped with the rotary valve means of the embodiment,
FIG. 2 is a sectional view of a main part of the rotary valve means of the embodiment, and FIG.
FIG. 4 is a sectional view taken along the line AA and FIG. In the figure, the same reference numerals are given to the engine parts corresponding to those of the conventional technique, and the description thereof is omitted because they are known. 1000 is an engine, 1 is a cylinder, 2 is a crankcase, 3 is a cylinder head, 4 is a piston, 5 is a crankshaft, 6 is a connecting rod, 7 is a combustion chamber, and 8 is a crankcase chamber. 11 is a vaporizer and is a crankcase chamber 8
It is connected to the. Reference numeral 20 is a cylinder air supply port provided in the crankcase 2. A reed valve 31 is provided outside the crankcase chamber 8 of the cylinder air supply port 20 and opens to the outside. A reed valve 32 is provided between the carburetor 11 and the crankcase chamber 8 and opens toward the crankcase chamber 8 side. Reference numeral 22 denotes a communication portion, which is a hole provided in the cylinder head 3 and communicating with the combustion chamber 7. An intake passage 26 is provided in the cylinder head 3 and intersects the communication portion 22 and is connected to the cylinder air supply port 20 via the reed valve 31. Reference numeral 25 denotes an exhaust passage which is provided in the cylinder head 3 and which intersects the intersection of the communication portion 22 and the intake passage 26.

Reference numeral 1500 denotes a rotary valve means, which is a valve member 151.
0, sliding member 1520, elastic member 1530, bearing member 1
540, a blind lid member 1550, and is provided at the intersection of the communication portion 22, the suction passage 26, and the exhaust passage. 3a
Is a sliding member hole that leads from the outer surface on one side of the cylinder head 3 to the combustion chamber 7 in the form of a multi-step serial passage with respect to the communication portion 22. Reference numeral 3b is a bearing member hole provided in the cylinder head 3 at the intersection of the communication portion 22, the intake passage 26, and the exhaust passage 25 and provided at least in the communication portion 22 and thus perpendicularly to the sliding portion hole 3a. Is. In the sliding member hole 3a, the sliding member 15 is sandwiched with the elastic member 1530 on the combustion chamber 7 side.
20 is fitted in the sliding member hole 3a in a hermetically slidable manner. The bearing member 1540 is fitted on both sides of the bearing member hole 36 that straddles the sliding member hole 3a, and rotatably supports the valve member 1510.

The valve member 1510 is a columnar member and has a notch 1511 having a substantially crescent-shaped cross section perpendicular to the axis with a width in a partial section in the longitudinal direction. The notch 1511 is provided at an intersection of the communication portion 22, the intake passage 26, and the exhaust passage 25 of the valve member 1510, and is provided at a position where the communication portion 22, the intake passage 26, and the exhaust passage 25 can face each other.
The sliding member 1520 has a hollow cylinder or a stepped hollow cylindrical shape in which the hollow portion 1521 also serves as the communication portion 22. In the case of the stepped hollow cylinder, the small diameter portion is opposite to the valve member 1510 and one end is a sliding cylinder. A surface 1522 is formed and contacts the cylindrical outer surface of the valve member 1510. The elastic member 1530 is the sliding member 1520.
Is a stepped cylinder, the sliding member 1520 is formed as a coil on the outside of the small diameter portion of the step, and when the sliding member 1520 is a simple hollow cylinder, it is a disc spring or a coil spring with a hole in the center. The sliding member 1520 provided in contact with the lower end face is pushed by the elastic force. The outer cylindrical surface of the sliding member 1520 is in contact with the sliding member hole 3a with a sliding gap 1523a, and can slide in the longitudinal direction of the communication portion 22.

The blind lid member 1550 is provided on the outer side of the sliding member hole 3a and has one end forming a cylindrical surface 1551 along the cylindrical surface of the valve member 1510, with a sliding gap 1551a interposed between the blind lid member 1550 and the valve member 1510. We support you. Rotary valve means 15
00 is connected to the crankshaft 5 by drive means 2000 (not shown). The operation of the above embodiment will be described. In the crankcase chamber 8, when the piston 4 reciprocates, the reed valve 31 acts as a discharge valve and the reed valve 32 acts as a suction valve to act as a pump to suck the air-fuel mixture from the carburetor 11 and from the cylinder air supply port 20. Send out. The sent air-fuel mixture passes through the suction passage 26 and the rotary valve means 1500.
To the inhalation system of the engine 1000. When the rotary valve means 1500 rotates to connect the communication portion 22 and the exhaust passage 25, an exhaust system is formed. Rotary valve means 1500
Is connected to the crankshaft 5 by a driving means 2000 (not shown) and is driven in synchronization with the reciprocating motion of the piston 4, so that the combustion chamber 7 can perform a thermodynamic cycle of intake, compression and explosion expansion exhaust.

An intake stroke is performed in the volume increasing stroke of the combustion chamber 7, a compression stroke is performed in the volume decreasing stroke of the combustion chamber 7, an explosive expansion stroke is performed in the volume increasing stroke, and an exhaust stroke is performed in the next volume decreasing stroke of the combustion chamber 7. The crankshaft 5 rotates twice during this period, and the piston 4 reciprocates twice. The rotary valve means 1500 must control the opening and closing of the passage so that only the intake passage 26 is opened during the intake stroke, two passages are closed during the compression and explosion expansion strokes, and only the exhaust passage 25 is opened during the exhaust stroke. This can be achieved by appropriately designing the rotation ratio of the drive means 2000 (not shown) if the rotary valve means 1500 is used. When the rotary valve means 1500 is rotated by the drive means 2000, the notch 1511 of the valve member 1510 rotates to form a rotary passage for switching the connection between the suction passage 26 and the communication portion 22, and between the communication portion 22 and the exhaust passage 25 one after another. The rotary valve means 1 is shown in FIG.
The port timing of 500 is shown.

In the figure, (a) shows the state immediately before the start of inhalation,
(B) is a state immediately after the end of inhalation from the start of inhalation, (c) is a state immediately after the end of inhalation, (d) is a state immediately after the end of inhalation and immediately before the start of exhaust, and (e) is immediately after the end of inhalation and immediately before the start of exhaust Another state, (f) is another state immediately after the end of intake and immediately before the start of exhaust, (g) is a state immediately before the start of exhaust,
(H) is a state from immediately after the start of exhaust to immediately before the end of exhaust,
(I) shows the state immediately after the end of exhaust. Between the state (c) and the state (g), the communication part 22 is closed while the suction passage 2
6 or at least one of the exhaust passages 25 is closed. In the state (c) to the state (g), the intake air trapped in the notch 1511 is discharged from the exhaust passage 25. When the rotary valve means 1500 makes one rotation, the combustion chamber 7 and the intake passage 26 and the combustion chamber 7 and the exhaust passage 25 communicate once before and after the closed state of the combustion chamber 7, respectively. Therefore, the closed period is compressed and exploded in the combustion chamber 7. If allotted to the expansion stroke, the preceding period to the intake stroke and the subsequent period to the exhaust period, the entire period corresponds to two revolutions of the crankshaft 7.

Therefore, if the rotation ratio of the driving means 2000 is set to 2: 1, the thermodynamic cycle in the combustion chamber 7 corresponds to one rotation of the rotary valve means 1500. Sliding member 1520
Is also affected by the pressure of the combustion chamber 7. Since the valve member 1510 is provided with the notch 1511, the sliding contact area is different between the ventral side having the notch 1511 and the back side opposite to the ventral side. During the compression stroke and the explosion stroke where the pressure in the combustion chamber 7 increases, the valve member 15
From the above, the contact between 10 and the sliding member 1520 is performed on the back side of the cutout 1511 and is performed on the ventral side of the cutout 1511 in the intake and exhaust strokes where the pressure in the combustion chamber 7 becomes low.
On the back side of the notch 1511, the sliding cylindrical surface 15 of the mating member is formed.
21 and the area on the ventral side is reduced by the width of the notch 1511, but the acting force of the sliding member 1520 at this time is small due to only the spring force of the elastic member 1530 and the load on the sliding surface is small and the oil film is retained. Is advantageous to.

In this way, the airtightness of the combustion chamber 7 is ensured by the sliding member hole 3
The oil film held in the gap 1523a between the inner wall of a and the cylindrical outer peripheral surface 1523 of the sliding member 1520 causes airtightness and the sliding gap between the cylindrical outer peripheral surface of the valve member 1510 and the sliding cylindrical surface 1522 of the sliding member 1520. It is carried out by the airtight action of the oil film held in 1522a. The lubrication of the sliding surface required for airtightness is performed by the lubricating oil mixed in the intake air that accompanies the movement of the intake air accompanying the movement of the cutout 1511. In this way, the rotary valve means 1500 has a simple structure, but exerts an airtight action necessary for controlling intake and exhaust and achieving its function. Further, if the sliding member 1520 is made of an oil-containing sintered metal, the lubricating oil retaining effect is more complete, which is advantageous. Bearing member 15
40 does not need to have a structure divided into two, and the sliding member hole 3b
It is also possible to use a single cylindrical metal bearing that penetrates.

[0021]

According to the present invention, a rotary valve means having a simple structure and high reliability can be obtained. Therefore, a gasoline engine using a small and lightweight rotary valve can be constructed. Therefore, the present invention can provide a rotary gasoline means having a simple structure and a reliable airtightness, thereby providing a highly reliable and low-cost practical gasoline engine.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an engine equipped with a rotary valve means of an embodiment.

FIG. 2 is a sectional view of a main part of the rotary valve means of the embodiment.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is an explanatory view of port timing of the rotary valve means of the embodiment.

FIG. 5 is a configuration diagram of an engine including a rotary valve means of a conventional example.

FIG. 6 is a sectional view of a main part of a rotary valve means of a conventional example.

FIG. 7 is a cross-sectional view of a conventional valve member.

FIG. 8 is a cross-sectional view of a main part of a rotary valve disclosed in Japanese Patent Application Laid-Open No. 59-103911.

FIG. 9 is a cross-sectional view of a main part of a conventional valve assembly.

FIG. 10 is a sectional view of a main part of a conventional seal assembly.

11 is a view on arrow A of FIG.

[Explanation of symbols]

1000 ... Engine, 1 ... Cylinder, 2 ... Crankcase,
3 ... Cylinder head, 3a ... Sliding member hole, 3b ... Bearing hole, 4 ... Piston, 5 ... Crank shaft, 6 ... Connecting rod, 8 ... Crank case chamber, 11 ... Vaporizer, 20 ...
Cylinder air supply port, 31 ... Reed valve, 32 ... Reed valve, 22 ... Communication part, 26 ... Intake passage, 25 ... Exhaust passage,
1500 ... Rotary valve means, 1510 ... Valve member, 1511
... Notch, 1520 ... Sliding member, 1521 ... Hollow part,
1522 ... Sliding cylindrical surface, 1522a ... Sliding gap, 152
3 ... Outer cylindrical surface, 1523a ... Gap, 1530 ... Elastic member, 1540 ... Bearing member, 1550 ... Blind lid member, 155
1 ... Cylindrical surface, 1551a ... Sliding gap, 100 ... Engine, 1
Reference numeral 5 ... Rotary valve means, 151 ... Valve member, 151a ... Intake passage, 1516 ... Exhaust passage, 152 ... Sealing member, 153
... bearings, 200 ... driving means, 210 ... passive gear pairs, 2
20 ... Power transmission shaft, 230 ... Drive gear pair, 10 ... Valve assembly, 11 ... Cylinder head, 12 ... Piston, 13
... cylinder, 14 ... combustion chamber, 15 ... rotor, 16 ... intake passage, 17 ... exhaust passage, 19 ... head port, 20 ... seal assembly, 21 ... lower housing, 22 ... upper housing, 23 ... split housing, 27 … Rotary seal,
34 ... Bearing, 36 ... Elastic seal

Claims (2)

[Claims] 1. A cylinder head (3) of an engine (1000) is provided with a passage (22), an intake passage (26) and an exhaust passage (25) communicating with a combustion chamber (7), and an intersection of the three passages. A hole perpendicular to the passage (22)
A rotary valve means (1500) is provided in the hole, and the combustion chamber (7) is switched to communicate with the intake passage (26) and the exhaust passage (25) through the rotational movement of the valve means (1500). In the engine, the valve means (1500) is a cylindrical member and has a substantially crescent-shaped notch (1511) in the radial direction over a part of the longitudinal direction intersecting the passage (22).
A valve member (1510) including a cylindrical surface (152), one end of which is slidably contactable with the outer surface of the valve member (1510).
2), which surrounds the passage (22) with its own inner wall and is slidable in the longitudinal direction along the passage (22) on the cylinder head (3).
A rotary-valve four-cycle gasoline engine, comprising: an elastic member (1530) provided at the other end of the sliding member (1520). 2. The rotary valve type four-cycle gasoline engine according to claim 1, wherein the sliding member (1520) is made of an oil-containing sintered metal.