WO2015194383A1 - Cylinder head, cylinder head assembly, engine, core that molds intake port for cylinder head, and die for molding said core - Google Patents

Cylinder head, cylinder head assembly, engine, core that molds intake port for cylinder head, and die for molding said core Download PDF

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Publication number
WO2015194383A1
WO2015194383A1 PCT/JP2015/066218 JP2015066218W WO2015194383A1 WO 2015194383 A1 WO2015194383 A1 WO 2015194383A1 JP 2015066218 W JP2015066218 W JP 2015066218W WO 2015194383 A1 WO2015194383 A1 WO 2015194383A1
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WO
WIPO (PCT)
Prior art keywords
cylinder
intake
cylinder head
valve guide
core
Prior art date
Application number
PCT/JP2015/066218
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French (fr)
Japanese (ja)
Inventor
延広 渡辺
正人 杉本
Original Assignee
ヤンマー株式会社
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 ヤンマー株式会社 filed Critical ヤンマー株式会社
Priority to CN201580032707.3A priority Critical patent/CN106460720B/en
Priority to BR112016029070A priority patent/BR112016029070A2/en
Publication of WO2015194383A1 publication Critical patent/WO2015194383A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a cylinder head, and also relates to a cylinder head assembly including a cylinder head and an intake side valve guide.
  • the present invention also relates to an engine, and to a core for forming an intake port of a cylinder head.
  • the present invention also relates to a mold for forming a core.
  • Patent Document 1 Japanese Patent Laid-Open No. 2000-045861
  • the upper surface of the intake port of this cylinder head (the surface opposite to the cylinder side of the intake port) has a spiral surface for generating a swirling flow that flows from the intake side to the cylinder side.
  • the end of the spiral surface on the cylinder side faces the space in the intake port, contacts the air, and does not contact the wall or the like.
  • the cylinder head generates a vortex (swirl flow) in the intake air on its spiral surface.
  • the fuel efficiency is made high by promoting the mixing of air and fuel by the eddy current.
  • the end of the spiral slope on the upper surface of the intake port faces the space, contacts the air, and does not contact the wall portion, so it is guided by the spiral slope.
  • the intake air does not receive a force from the wall or the like at the end, and flows out into the space vigorously and smoothly. Therefore, it may be difficult to adjust the flow of the swirl flow, and it may be difficult to adjust the swirl ratio. Therefore, problems such as difficulty in suppressing the generation of particulate matter may occur.
  • an object of the present invention is to provide a cylinder head that can easily adjust the swirl ratio to an appropriate swirl ratio, a cylinder head assembly including such a cylinder head, an engine including such a cylinder head, such a
  • An object of the present invention is to provide a core for forming an intake port of a cylinder head and a mold for forming such a core.
  • the cylinder head of the present invention is An intake inlet port for guiding intake air to the cylinder side;
  • An intake side valve guide boss communicating with the outside and the intake introduction port;
  • the inner surface of the intake inlet port is A spiral surface extending spirally from the intake side to the cylinder side around the intake side valve guide boss;
  • a wall portion extending from the end on the cylinder side of the spiral surface to the cylinder side;
  • the terminal end of the spiral surface is located on the cylinder side of the tip of the intake side valve guide boss on the cylinder side.
  • the smooth swirl flow (swirl flow) of the intake air is provided at the wall portion. Can disturb and disturb the flow. Further, by adjusting the length of the wall portion in the extending direction, the degree of disturbance of the swirling flow can be adjusted. Therefore, adjustment to an appropriate swirl ratio can be easily performed.
  • the end of the spiral surface on the cylinder side is located on the cylinder side with respect to the tip of the intake side valve guide boss on the cylinder side, so that the adjustment width of the height difference of the spiral surface is increased.
  • This adjustment range can also be used as a parameter for adjusting the swirl ratio. Therefore, the degree of freedom in adjusting the swirl ratio can be further increased, and adjustment to an appropriate swirl ratio can be performed more easily.
  • the cylinder head assembly of the present invention is A cylinder head of the present invention; An intake side valve guide that is inserted and fixed to the intake side valve guide boss, The end of the spiral surface is located on the cylinder side with respect to the tip of the intake side valve guide on the cylinder side.
  • the extension length of the wall portion is increased in order to increase the swirl ratio. Even if the entire wall portion is processed so as to be shortened (maximum processing of the wall portion), the tool for processing the wall portion does not interfere with the intake side valve guide. Therefore, it is possible to prevent the intake side valve guide from being damaged due to contact with the tool for processing. In addition to this, there is no need to take a means for preventing the tool from interfering with the intake side valve guide, for example, forming a relief to prevent the tool from interfering with the wall portion. The valve guy doesn't get in the way when processing. Therefore, the processing can be easily performed without increasing the cost based on the provision of the means.
  • the length in the extending direction of the valve guide boss of the portion of the intake side valve guide that protrudes from the intake side valve guide boss to the cylinder side is 1/3 of the length of the wall portion in the extending direction. Shorter than.
  • the length of the wall portion in the extending direction is long, the effect of inhibiting the smooth flow of the swirl flow by the wall portion can be increased. Therefore, when it is desired to reduce the swirl ratio, the swirl ratio can be easily adjusted to a small value.
  • the engine of the present invention is The cylinder head of the present invention is provided, or the cylinder head assembly of the present invention is provided.
  • the swirl ratio can be adjusted more easily.
  • the horizontal water-cooled single cylinder diesel engine of the present invention is Comprising the cylinder head of the present invention, or comprising the cylinder head assembly of the present invention, Furthermore, a piston and a cylinder block having only one of the above cylinders are provided, The piston is configured to advance and retract in the cylinder in a direction substantially perpendicular to the height direction of the cylinder block.
  • the said height direction shows the vertical direction in the state mounted in the horizontal surface with the same attitude
  • the swirl ratio can be easily adjusted.
  • the core of the present invention is a core for molding the intake inlet port in the mold for molding the cylinder head of the present invention.
  • the mold of the present invention is a mold for molding the core of the present invention.
  • the swirl ratio can be adjusted more easily. Further, according to the embodiment, not only can the intake side valve guide be prevented from being damaged, but also means for preventing the tool from interfering with the intake side valve guide need not be taken. Therefore, there is no increase in cost based on the provision of the means, and processing can be performed easily.
  • FIG. 1 is a longitudinal sectional view of a horizontal water-cooled single cylinder diesel engine according to an embodiment of the present invention. It is a schematic cross section of the cylinder head assembly with which the above-mentioned horizontal type water cooling single cylinder diesel engine is provided. It is a perspective view when the cylinder head of the said horizontal type water cooling single cylinder diesel engine is seen from the opposite side to the cylinder side. It is a perspective view when the said cylinder head is seen from the inlet side of an intake air introduction port. It is a perspective view when the said cylinder head is seen from the exit side of an exhaust discharge port. It is a perspective view when the said cylinder head is seen from the cylinder side.
  • FIG. 1 It is a figure which shows the contour line of the helical surface by the side of the cylinder of the intake introduction port shape
  • FIG. 1 is a longitudinal sectional view of a horizontal water-cooled single cylinder diesel engine according to an embodiment of the present invention.
  • the horizontal water-cooled single cylinder diesel engine (hereinafter simply referred to as an engine) includes a cylinder block 1, a cylinder head 2, a crankshaft 3, and a piston 4.
  • the cylinder head 2 is attached to the cylinder block 1.
  • crankshaft 3 extends in a direction perpendicular to the paper surface.
  • the cylinder block 1 has only one cylinder 10, and the cylinder 10 extends in the horizontal longitudinal direction. In other words, the cylinder 10 extends in the lateral direction with respect to the cylinder block 1.
  • the piston 4 advances and retreats in the cylinder 10 in the direction indicated by the arrow A in FIG.
  • the engine further includes a sub tank 5, a flywheel 6, an intake pipe 7, an outlet 8, an air cleaner 9, a muffler 12, and a fuel injection device 13. Cooling water for the radiator is returned to the sub tank 5.
  • the flywheel 6 is fixed to the end of the crankshaft 3.
  • the flywheel 6 is provided to suppress variation in rotational speed of the crankshaft 3 and to moderate changes in rotational speed by increasing the inertial moment of the rotating system. Further, by rotating the flywheel 6, kinetic energy is stored in the flywheel 6.
  • the flywheel 6 is also used as an energy source for applying torque to another machine element.
  • the air that has passed through the air cleaner 9 is supplied to the combustion chamber 19 in the cylinder 10 via the intake pipe 7, and diesel fuel is supplied from the fuel injection device 13 to the combustion chamber 19 at an appropriate timing.
  • diesel fuel is burned in the combustion chamber 19.
  • the crankshaft 3 is rotated to drive the load member.
  • the high-temperature exhaust gas generated in the combustion chamber 19 is passed through the muffler 12 and the ejection port 8 in this order. In this way, the exhaust gas is discharged into the atmosphere after the exhaust sound is attenuated.
  • the jet port 8 plays a role of changing the direction of exhaust from the muffler 12. Further, this engine circulates cooling water through a circulation path that passes through the radiator, the cylinder block 1, various electrical components, and the like, thereby cooling those portions with the circulating cooling water.
  • FIG. 2 is a schematic cross-sectional view of the cylinder head assembly 20 provided in the engine.
  • the cylinder is located below the cylinder head assembly 20 on the lower side of the sheet of FIG. 2 as indicated by arrow B in FIG.
  • the cylinder head assembly 20 includes a cylinder head 2 and an intake side valve guide 21.
  • the cylinder head 2 includes an intake introduction port 25, an exhaust discharge port 26, an intake side valve guide boss 27, and an exhaust side valve guide boss 28.
  • the intake inlet port 25 guides intake air from the intake manifold side (not shown) to the cylinder 10 (see FIG. 1) side, while the exhaust discharge port 26 guides exhaust gas from the cylinder 10 side to the exhaust manifold side (not shown). ing.
  • the intake side valve guide boss 27 extends in a straight line, and the extending direction of the intake side valve guide boss 27 substantially coincides with the extending direction of the cylinder 10 (see FIG. 1). ing.
  • the intake side valve guide boss 27 communicates the outside of the cylinder head 2 and the intake introduction port 25.
  • the exhaust side valve guide boss 28 extends in a straight line, and the extending direction of the exhaust side valve guide boss 28 substantially coincides with the extending direction of the cylinder 10.
  • the exhaust valve guide boss 28 communicates the outside of the cylinder head 2 with the exhaust discharge port 26.
  • the intake side valve guide 21 is press-fitted into the intake side valve guide boss 27. As shown in FIG. 2, the cylinder 10 (cylinder liner (denoted by 88 in FIG. 1)) of the intake side valve guide 21 in a state where the intake side valve guide 21 is attached to a predetermined position of the intake side valve guide boss 27. The front end portion 97 on the side projects from the opening on the cylinder 10 side of the intake side valve guide boss 27 toward the cylinder 10 side.
  • reference numeral 23 denotes a spiral surface of the intake air introduction port 25 described in detail later
  • reference numeral 24 denotes a wall portion (lip portion) of the intake air introduction port 25 described in detail later.
  • the wall portion 24 extends from the terminal end (end on the cylinder 10 side) 91 of the spiral surface 23 to the cylinder 10 side.
  • the end 40 of the wall 24 opposite to the cylinder 10 side is located closer to the cylinder 10 than the opening (tip) 90 of the intake side valve guide boss 27 on the cylinder 10 side.
  • the end 40 of the wall 24 opposite to the cylinder 10 side is located closer to the cylinder 10 than the tip 41 of the intake side valve guide 21 on the cylinder 10 side.
  • the terminal end 91 of the spiral surface 23 is located closer to the cylinder 10 than the tip 90 of the intake side valve guide boss 27 on the cylinder 10 side. Further, the terminal end 91 of the spiral surface 23 is located closer to the cylinder 10 than the tip 41 on the cylinder 10 side of the intake side valve guide 21.
  • FIG. 3 is a perspective view when the cylinder head 2 is viewed from the side opposite to the cylinder 10 side
  • FIG. 4 is a perspective view when the cylinder head 2 is viewed from the inlet side of the intake air introduction port 25.
  • . 5 is a perspective view when the cylinder head 2 is viewed from the outlet side of the exhaust discharge port 26, and
  • FIG. 6 is a perspective view when the cylinder head 2 is viewed from the cylinder 10 side.
  • the cylinder head 2 has four head bolt insertion holes 30 to 33.
  • Each of the head bottle insertion holes 30 to 33 extends substantially parallel to the intake side valve guide boss 27.
  • Each head bottle insertion hole 30 to 33 penetrates the cylinder head 2.
  • the cylinder head 2 is attached to the cylinder block 1 by inserting a head bolt (not shown) into each of the head bottle insertion holes 30 to 33 and then tightening the head bolt into the cylinder block 1.
  • the center of the inlet of the intake inlet port 25 is on the opposite side of the cylinder head 2 from the center of the cylinder head 2 with respect to the extending direction of the intake valve guide boss 27. And located on one side with respect to a plane including the central axis of the intake side valve guide boss 27 and the central axis of the exhaust side valve guide boss 28.
  • the center of the outlet of the exhaust discharge port 26 is positioned substantially at the center of the cylinder head 2 in the extending direction of the intake side valve guide boss 27. Further, as shown in FIG.
  • the center of the outlet of the exhaust discharge port 26 is located substantially on the plane including the central axis of the intake side valve guide boss 27 and the central axis of the exhaust side valve guide boss 28.
  • the extension line of the central axis of the intake side valve guide boss 27 passes through the approximate center of the cylinder 10 side opening of the intake air introduction port 25, while the exhaust side valve guide boss 27
  • the extension line of the central axis 28 passes through the approximate center of the opening of the exhaust discharge port 26 on the cylinder 10 side.
  • FIG. 7 is a perspective view of a mold 45 for forming a core for forming the intake air introduction port 25 in a mold (not shown) for forming the cylinder head 2.
  • FIG. 8 is a perspective view of the upper mold 46 of the mold 45 for molding the core
  • FIG. 9 is a perspective view of the lower mold 47 of the mold 45 for molding the core.
  • a mold (hereinafter referred to as “core mold”) 45 for molding the core includes an upper mold 46 and a lower mold 47, and is separated into an upper mold 46 and a lower mold 47. It is possible. When the core is molded, the upper mold 46 and the lower mold 47 form an integral structure. On the other hand, when the core is taken out, the upper mold 46 and the lower mold 47 are separated. Yes.
  • the upper mold 46 is a mold for forming a portion of the intake introduction port 25 located on the opposite side of the core from the cylinder 10 side, while the lower mold 47 is an intake introduction port located on the cylinder 10 side of the core. This is a mold for molding 25 portions.
  • the core mold 45 has one core forming passage 48 that matches the shape of the core.
  • the shape of the core forming passage 48 matches the shape of the intake inlet port 25 (see FIG. 4) of the cylinder head 2.
  • the opening 50 corresponding to the inlet side of the intake introduction port 25 in the core forming passage 48 has a substantially rectangular shape, while the outlet side of the intake introduction port 25 in the core forming passage 48.
  • the opening 51 corresponding to has a circular shape.
  • the upper surface of the core forming passage 48 opposite to the cylinder 10 side has a spiral forming surface 60 for forming the spiral surface 23 (see FIG. 2).
  • the spiral forming surface 60 extends so as to surround the guide boss forming passage 61 corresponding to the intake side valve guide boss 27 (see FIG. 2).
  • the wall forming projection 62 for forming the wall portion 24 is separated from the spiral forming surface 60 at the end opposite to the opening 50 side of the spiral forming surface 60. Protrudes in the direction.
  • the wall forming projection 62 has an integral structure.
  • the wall forming protrusion 62 includes a spiral corresponding protruding portion 63 protruding from the spiral forming surface 60 and a spiral outer protruding portion 64 protruding from a portion located on the outer side in the radial direction of the spiral forming surface 60.
  • the lower surface of the core forming passage 48 on the cylinder 10 side is formed on the cylinder side for forming the spiral surface 67, the protruding portion receiving recess 68, and the cylinder side portion of the intake air introduction port 25. And a hole 69.
  • each of the spiral surface 67 and the protrusion accommodating recess 68 is connected to the cylinder side hole 69 independently of each other.
  • FIG. 10 is a partially enlarged perspective view of the periphery of the guide boss molding passage 61 on the spiral molding surface 60 of the upper mold 46.
  • the spiral forming surface 60 goes from the opening 50 (see FIG. 8) side of the core forming passage 48 to the wall forming protrusion 62 in the extending direction of the guide boss forming passage 61. Accordingly, it is gradually positioned on the distal end side of the wall forming projection 62.
  • the spiral forming surface 60 gradually increases in a slope shape from the end on the opening 50 side of the spiral forming surface 60 to the terminal end 77 on the opposite side to the opening 50 side of the spiral forming surface 60.
  • the spiral forming surface 60 is perpendicular to the paper surface 10 and the edge 78 of the opening on the front end side of the wall portion forming protrusion 62 of the guide boss forming passage 61 on the way to the near side in the direction perpendicular to the paper surface 10.
  • the positions in the correct direction are the same.
  • the spiral forming surface 60 extends spirally so as to surround the guide boss forming passage 61.
  • the terminal end 77 on the opposite side of the opening 50 side of the spiral forming surface 60 is the opening on the tip side of the wall portion forming protrusion 62 of the guide boss forming passage 61.
  • the wall forming protrusion 62 is located on the front end side of the wall portion forming protrusion 62 with respect to the edge 78. Further, in FIG. 10, with respect to the extending direction of the guide boss forming passage 61, a portion 79 on the opening 50 (see FIG. 8) side of the spiral forming surface 60 is located on the wall forming protrusion 62 rather than the edge 78 of the opening. It is located on the side opposite to the tip side. Further, as shown in FIG. 10, the wall forming protrusion 62 is formed with a guide boss from the end 77 on the opposite side to the opening 50 side of the spiral forming surface 60 to the front side in the direction perpendicular to the paper surface of FIG. The passage 61 extends in a direction substantially parallel to the extending direction of the passage 61.
  • FIG. 11 is a diagram showing contour lines of the spiral surface 23 of the intake air introduction port 25 formed by the core portion formed by the upper mold 46.
  • FIG. 12 is a contour line of the spiral surface 80 on the cylinder 10 side of the intake air introduction port 25 formed by the core portion formed by the lower mold 47.
  • FIG. 11 indicates that the smaller the numerical value, the closer to the cylinder 10 side.
  • the numbers shown in FIG. 12 also indicate that the numerical value decreases toward the cylinder 10 side. Indicates that it is located.
  • the shape shown in FIG. 11 matches the shape of the spiral molding surface 60 (see FIG. 8), and the shape shown in FIG. 12 matches the shape of the spiral surface 67 (see FIG. 9).
  • reference numeral 24 indicates a wall portion (lip portion) indicated by 24 in FIG. In FIG. 11, the wall portion 24 shows a cross section, and the cut surface is located at the same position as the terminal end 77 of the spiral forming surface 60.
  • the spiral surface 23 has a spiral shape that is gradually positioned on the cylinder 10 side from the intake manifold side to the cylinder 10 side. Further, as shown in FIG. 12, the spiral surface 80 on the cylinder 10 side of the intake air introduction port 25 is gradually positioned on the cylinder 10 side as it goes from the intake manifold side to the cylinder 10 side.
  • the protrusion of the pin indicated by reference numeral 72 in FIG. 8 is inserted into the hole indicated by reference numeral 73 in FIG. 9, and the protrusion indicated by reference numeral 74 in FIG. Is inserted into a hole indicated by reference numeral 75 in FIG. 9 to form a core mold 45 (see FIG. 7).
  • the portion 70 on the opening 50 side of the spiral molding surface 60 and the spiral surface 67 are coupled to each other to form a spiral hole (helical port) that ends by being blocked by the wall molding projection 62. ).
  • the shape of the core coincides with the shape of the spiral hole that is interrupted by the wall forming projection 62. Since the shape (form) of the core is clear from this description, the illustration of the actual core is omitted.
  • FIG. 13 is a diagram showing the outline of the intake inlet port 25, and FIG. 14 is a cross-sectional view taken along the line AA in FIG.
  • reference numeral 90 denotes an end face (tip) of the intake side valve guide boss 27 (see FIG. 2) on the cylinder 10 side, and a contour ⁇ indicated by a dotted line in FIG.
  • the outline of the intake port of the reference example is shown.
  • a contour ⁇ indicated by a two-dot chain line in FIG. 13 is the contour of the intake introduction port of the second reference example in which the wall portion extends from the end surface 90 on the cylinder 10 side of the intake side valve guide boss 27 to the cylinder 10 side.
  • FIG. 13 indicates the outline of the intake air introduction port 25 of the above embodiment.
  • reference numeral 91 denotes the end of the spiral surface 23.
  • FIGS. 11, 12, and 14 the positions indicated by the numbers surrounded by the same circles indicate the positions of the same contour lines.
  • the intake side valve guide boss 27 is positioned closer to the cylinder 10 than the end surface (tip) on the cylinder 10 side.
  • the end 40 of the wall portion 24 opposite to the cylinder 10 side is positioned closer to the cylinder 10 than the tip 41 of the intake side valve guide 21 on the cylinder 10 side. is doing.
  • the length in the extending direction of the valve guide boss 27 of the portion 95 protruding from the intake side valve guide boss 27 to the cylinder 10 side in the intake side valve guide 21 is as follows. It is shorter than 1/3 of the length in the extending direction (the extending direction of the valve guide boss 27).
  • the wall 24 extending from the terminal end 91 on the cylinder 10 side of the spiral surface (spiral slope) 23 of the intake air introduction port 25 to the cylinder 10 side is provided.
  • the smooth flow of the swirl flow can be hindered and disturbed.
  • the degree of disturbance of the swirling flow can be adjusted. Therefore, adjustment to an appropriate swirl ratio can be easily performed.
  • the terminal end 91 on the cylinder 10 side of the spiral surface 23 is positioned closer to the cylinder 10 than the tip 90 on the cylinder 10 side of the intake side valve guide boss 27. 23 can be increased, and this adjustment range can also be used as a parameter for adjusting the swirl ratio. Therefore, the degree of freedom in adjusting the swirl ratio can be further increased, and adjustment to an appropriate swirl ratio can be performed more easily.
  • the end 91 of the spiral surface is located on the cylinder 10 side than the tip 41 on the cylinder 10 side of the intake side valve guide 21, in order to increase the swirl ratio, Even if the entire processing of the wall portion 24 (maximum processing of the wall portion 24) is performed so as to shorten the extending length of the wall portion 24, the tool for processing the wall portion 24 is used as the intake side valve. There is no interference with the guide 21. Therefore, it is possible to prevent the intake side valve guide 21 from being damaged due to contact with a tool for processing.
  • valve guide 21 it is not necessary to take a means for preventing the tool from interfering with the intake side valve guide 21, for example, a means for forming a relief to prevent the tool from interfering with the wall.
  • the valve guide does not get in the way when machining parts. Therefore, the processing can be easily performed without increasing the cost based on the provision of the means.
  • the swirl ratio can be adjusted more easily in the horizontal water-cooled single cylinder diesel engine.
  • the mold 45 for molding the core of the above-described embodiment it is possible to mold the core that can mold the intake air intake port 25 having a shape that allows easy adjustment of the swirl ratio in the cylinder head 2. If the core is used, the cylinder head 2 having a shape that allows easy adjustment of the swirl ratio can be formed.
  • the terminal end 91 of the spiral surface 23 is located closer to the cylinder 10 than the end 41 of the intake side valve guide 21 on the cylinder 10 side.
  • the end of the spiral surface may be located on the opposite side of the cylinder side from the cylinder side end of the intake side valve guide.
  • the length in the extending direction of the intake side valve guide boss 27 of the portion 95 protruding from the intake side valve guide boss 27 to the cylinder 10 side in the intake side valve guide 21 is the above-described length of the wall portion 24. It was shorter than 1/3 of the length in the extending direction.
  • the length in the extending direction of the valve guide boss at the portion protruding from the intake side valve guide boss to the cylinder side in the intake side valve guide is 1 / of the length of the wall portion in the extending direction. It may be 3 or more.
  • the shape of the intake port of the present invention is not limited to the shape of the above embodiment.
  • the cross section of the wall portion 24 is substantially rectangular when cut along a plane perpendicular to the extension line of the central axis of the intake side valve guide boss 27. It has become.
  • FIG. 15 that is, a perspective view showing a part of the cylinder head 102 of the modified example, when cut along a plane perpendicular to the extension line of the central axis of the intake side valve guide boss 127
  • the cross-sectional shape of the wall portion 124 may have a portion that expands toward the end as the distance from the intake side valve guide boss 127 increases.
  • the protruding height of the wall portion 224 is about half of the protruding height of the wall portion 124 shown in FIG. May be the height.
  • the distance from the cylinder side end surface (tip) 390 of the intake side valve guide boss 327 to the wall portion 324 is as follows. 15 may be about 1 ⁇ 4 of the distance from the cylinder-side end surface (tip) 190 to the wall portion 124 of the intake-side valve guide boss 127 of the modification shown in FIG. Further, the thickness of the wall portion 324 may be about half of the thickness of the wall portion 124.
  • the engine of the above embodiment is a horizontal water-cooled single cylinder diesel engine, but the engine of the present invention may be a vertical engine, not a horizontal engine, not a water-cooled engine, An air-cooled engine may be used.
  • the engine of the present invention may be a multi-cylinder engine instead of a single-cylinder engine.
  • the engine of the present invention may be a gasoline engine or a turbine engine instead of a diesel engine.
  • the engine of the present invention is preferably mounted on an engine of an agricultural machine such as a tiller, a rice transplanter, or a tractor, but the engine of the present invention may be mounted on an engine of any vehicle other than an agricultural machine, The engine of the present invention may be mounted on any vehicle engine other than a vehicle such as a ship.
  • At least one of the data representing the cylinder head of the present invention, the data representing the mold for molding the cylinder head of the present invention, the data representing the core of the present invention, and the data representing the mold for molding the core of the present invention is indirect evidence of infringement of the present invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

An inner surface of an intake guiding port (25) is configured so as to have a wall section (24) that extends from a terminus (91) on the cylinder side of a spiral-shaped surface (23) to the cylinder side. An end (40) on the opposite side to the cylinder side of the wall section (24) is positioned further on the cylinder side than a cylinder-side opening in an intake-side valve guide boss (27).

Description

シリンダヘッド、シリンダヘッドアッセンブリ、エンジン、シリンダヘッドの吸気ポートを成形する中子、および、その中子を成形するための型Cylinder head, cylinder head assembly, engine, core for molding cylinder head intake port, and mold for molding the core
　本発明は、シリンダヘッドに関し、また、シリンダヘッドと、吸気側バルブガイドとを備えるシリンダヘッドアッセンブリに関する。また、本発明は、エンジンに関し、また、シリンダヘッドの吸気ポートを成形する中子に関する。また、本発明は、中子を成形するための型に関する。 The present invention relates to a cylinder head, and also relates to a cylinder head assembly including a cylinder head and an intake side valve guide. The present invention also relates to an engine, and to a core for forming an intake port of a cylinder head. The present invention also relates to a mold for forming a core.
　従来、シリンダヘッドとしては、特開２０００－０４５８６１号公報（特許文献１）に記載されているものがある。このシリンダヘッドの吸気ポートの上面（吸気ポートのシリンダ側とは反対側の面）は、吸気側からシリンダ側に流れる旋回流を生成するための螺旋状の面を有する。上記螺旋状の面のシリンダ側の終端は、吸気ポート内のスペースに面していて空気と接触し、壁部等に接触していない。このシリンダヘッドは、その螺旋状の面で、吸気に渦流（旋回流）を生成している。そして、その渦流によって空気と燃料の混合を促進することによって、燃料効率を高くしている。 Conventionally, as a cylinder head, there is one described in Japanese Patent Laid-Open No. 2000-045861 (Patent Document 1). The upper surface of the intake port of this cylinder head (the surface opposite to the cylinder side of the intake port) has a spiral surface for generating a swirling flow that flows from the intake side to the cylinder side. The end of the spiral surface on the cylinder side faces the space in the intake port, contacts the air, and does not contact the wall or the like. The cylinder head generates a vortex (swirl flow) in the intake air on its spiral surface. And the fuel efficiency is made high by promoting the mixing of air and fuel by the eddy current.
　しかしながら、上記従来のシリンダヘッドでは、吸気ポートの上面の螺旋状のスロープの終端がスペースに面していて空気と接触し、壁部に接触していないから、その螺旋状のスロープよって案内された吸気が、上記終端で壁部等から力を受けることがなく、勢い良くかつ円滑にスペースに流出する。したがって、旋回流の流れを調整しにくく、スワ－ル比を調整しにくいことがある。したがって、粒子状物質の発生を抑制しにくい等の問題を生じることがある。 However, in the above conventional cylinder head, the end of the spiral slope on the upper surface of the intake port faces the space, contacts the air, and does not contact the wall portion, so it is guided by the spiral slope. The intake air does not receive a force from the wall or the like at the end, and flows out into the space vigorously and smoothly. Therefore, it may be difficult to adjust the flow of the swirl flow, and it may be difficult to adjust the swirl ratio. Therefore, problems such as difficulty in suppressing the generation of particulate matter may occur.
特開２０００－０４５８６１号公報（第３図）JP 2000-045861 A (FIG. 3)
　そこで、本発明の課題は、スワ－ル比を、適切なスワ－ル比に調整し易いシリンダヘッド、そのようなシリンダヘッドを備えるシリンダヘッドアッセンブリ、そのようなシリンダヘッドを備えるエンジン、そのようなシリンダヘッドの吸気ポートを成形する中子、および、そのような中子を成形するための型を提供することにある。 Accordingly, an object of the present invention is to provide a cylinder head that can easily adjust the swirl ratio to an appropriate swirl ratio, a cylinder head assembly including such a cylinder head, an engine including such a cylinder head, such a An object of the present invention is to provide a core for forming an intake port of a cylinder head and a mold for forming such a core.
　上記課題を解決するため、この発明のシリンダヘッドは、
　吸気をシリンダ側に導くための吸気導入ポートと、
　外部と、上記吸気導入ポートとを連通する吸気側バルブガイドボスとを備え、
　上記吸気導入ポートの内面は、
　上記吸気側バルブガイドボスの回りを吸気側からシリンダ側に螺旋状に延在する螺旋状面と、
　その螺旋状面の上記シリンダ側の終端から上記シリンダ側に延在する壁部と
を有し、
　上記螺旋状面の上記終端は、上記吸気側バルブガイドボスの上記シリンダ側の先端よりも上記シリンダ側に位置していることを特徴としている。 In order to solve the above problems, the cylinder head of the present invention is
An intake inlet port for guiding intake air to the cylinder side;
An intake side valve guide boss communicating with the outside and the intake introduction port;
The inner surface of the intake inlet port is
A spiral surface extending spirally from the intake side to the cylinder side around the intake side valve guide boss;
A wall portion extending from the end on the cylinder side of the spiral surface to the cylinder side;
The terminal end of the spiral surface is located on the cylinder side of the tip of the intake side valve guide boss on the cylinder side.
　本発明によれば、螺旋状面（螺旋状のスロープ）のシリンダ側の終端からシリンダ側に延在する壁部を備えるから、その壁部で吸気の旋回流（スワ－ル流）の円滑な流れを妨げて乱すことができる。また、この壁部の延在方向の長さ等を調整することによって、その旋回流の流れの乱れの程度も調整できる。したがって、適切なスワ－ル比への調整を容易に行うことができる。 According to the present invention, since the wall portion extending from the cylinder-side end of the spiral surface (spiral slope) to the cylinder side is provided, the smooth swirl flow (swirl flow) of the intake air is provided at the wall portion. Can disturb and disturb the flow. Further, by adjusting the length of the wall portion in the extending direction, the degree of disturbance of the swirling flow can be adjusted. Therefore, adjustment to an appropriate swirl ratio can be easily performed.
　また、本発明によれば、螺旋状面のシリンダ側の終端が、吸気側バルブガイドボスのシリンダ側の先端よりもシリンダ側に位置しているから、螺旋状面の高低差の調整幅を大きくできて、この調整幅も、スワ－ル比の調整のパラメータとすることができる。したがって、スワ－ル比の調整の自由度を更に大きくできて、適切なスワ－ル比への調整を更に容易に行うことができる。 In addition, according to the present invention, the end of the spiral surface on the cylinder side is located on the cylinder side with respect to the tip of the intake side valve guide boss on the cylinder side, so that the adjustment width of the height difference of the spiral surface is increased. This adjustment range can also be used as a parameter for adjusting the swirl ratio. Therefore, the degree of freedom in adjusting the swirl ratio can be further increased, and adjustment to an appropriate swirl ratio can be performed more easily.
　また、本発明のシリンダヘッドアッセンブリは、
　本発明のシリンダヘッドと、
　上記吸気側バルブガイドボスに挿通されて固定された吸気側バルブガイドと
を備え、
　上記螺旋状面の上記終端は、上記吸気側バルブガイドの上記シリンダ側の先端よりも上記シリンダ側に位置していることを特徴としている。 The cylinder head assembly of the present invention is
A cylinder head of the present invention;
An intake side valve guide that is inserted and fixed to the intake side valve guide boss,
The end of the spiral surface is located on the cylinder side with respect to the tip of the intake side valve guide on the cylinder side.
　本発明によれば、螺旋状面の終端が、吸気側バルブガイドのシリンダ側の先端よりもシリンダ側に位置しているから、スワ－ル比を大きくするべく、壁部の延在長さを短くするように壁部の全加工（壁部の最大限の加工）を行ったとしても、壁部の加工を行うための工具が、吸気側バルブガイドに干渉することがない。したがって、加工を行うための工具との接触に基づく吸気側バルブガイドの損傷を防止できる。また、これに加えて、工具が吸気側バルブガイドと干渉するのを防止するための手段、例えば、工具にその干渉を防止する逃げを形成する事等の手段を、講じる必要がなく、壁部の加工の際にバルブガイが邪魔になることもない。したがって、その手段を設けることに基づく、コストアップが生じることもなく、加工も簡易に行うことができる。 According to the present invention, since the terminal end of the spiral surface is located on the cylinder side with respect to the cylinder side tip of the intake side valve guide, the extension length of the wall portion is increased in order to increase the swirl ratio. Even if the entire wall portion is processed so as to be shortened (maximum processing of the wall portion), the tool for processing the wall portion does not interfere with the intake side valve guide. Therefore, it is possible to prevent the intake side valve guide from being damaged due to contact with the tool for processing. In addition to this, there is no need to take a means for preventing the tool from interfering with the intake side valve guide, for example, forming a relief to prevent the tool from interfering with the wall portion. The valve guy doesn't get in the way when processing. Therefore, the processing can be easily performed without increasing the cost based on the provision of the means.
　また、一実施形態では、
　上記吸気側バルブガイドにおいて上記吸気側バルブガイドボスから上記シリンダ側に飛び出している部分の上記バルブガイドボスの延在方向の長さは、上記壁部の上記延在方向の長さの１／３よりも短い。 In one embodiment,
The length in the extending direction of the valve guide boss of the portion of the intake side valve guide that protrudes from the intake side valve guide boss to the cylinder side is 1/3 of the length of the wall portion in the extending direction. Shorter than.
　上記実施形態によれば、壁部の延在方向の長さが長いから、壁部によるスワ－ル流の円滑な流れを阻害する効果を大きくできる。したがって、スワ－ル比を小さくしたい場合に、スワ－ル比を容易に小さい値に調整できる。 According to the above embodiment, since the length of the wall portion in the extending direction is long, the effect of inhibiting the smooth flow of the swirl flow by the wall portion can be increased. Therefore, when it is desired to reduce the swirl ratio, the swirl ratio can be easily adjusted to a small value.
　また、本発明のエンジンは、
　本発明のシリンダヘッドを備えるか、または、本発明のシリンダヘッドアッセンブリを備えることを特徴としている。 The engine of the present invention is
The cylinder head of the present invention is provided, or the cylinder head assembly of the present invention is provided.
　本発明のエンジンによれば、スワ－ル比の調整をより容易に行うことができる。 According to the engine of the present invention, the swirl ratio can be adjusted more easily.
　また、本発明の横型水冷単気筒ディーゼルエンジンは、
　本発明のシリンダヘッドを備えるか、または、本発明のシリンダヘッドアッセンブリを備え、
　更に、ピストンと、一つのみの上記シリンダを有するシリンダブロックとを備え、
　上記ピストンが、上記シリンダ内を、上記シリンダブロックの高さ方向に略垂直な方向に進退するようになっていることを特徴としている。 The horizontal water-cooled single cylinder diesel engine of the present invention is
Comprising the cylinder head of the present invention, or comprising the cylinder head assembly of the present invention,
Furthermore, a piston and a cylinder block having only one of the above cylinders are provided,
The piston is configured to advance and retract in the cylinder in a direction substantially perpendicular to the height direction of the cylinder block.
　尚、上記高さ方向とは、本発明の横型水冷単気筒ディーゼルエンジンを車両等に搭載するときの姿勢と同じ姿勢で水平面に載置した状態での鉛直方向を示す。 In addition, the said height direction shows the vertical direction in the state mounted in the horizontal surface with the same attitude | position as the attitude | position when mounting the horizontal type | mold water-cooled single cylinder diesel engine of this invention in a vehicle etc.
　本発明の横型水冷単気筒ディーゼルエンジンによれば、スワ－ル比の調整を容易に行うことができる。 According to the horizontal water-cooled single cylinder diesel engine of the present invention, the swirl ratio can be easily adjusted.
　また、本発明の中子は、本発明のシリンダヘッドを成形するための型において上記吸気導入ポート成形するための中子である。 Further, the core of the present invention is a core for molding the intake inlet port in the mold for molding the cylinder head of the present invention.
　本発明によれば、スワ－ル比の調整を行い易い形状のシリンダヘッドを成形できる。 According to the present invention, it is possible to form a cylinder head having a shape that allows easy adjustment of the swirl ratio.
　また、本発明の型は、本発明の中子を成形するための型である。 The mold of the present invention is a mold for molding the core of the present invention.
　本発明によれば、シリンダヘッドにおいてスワ－ル比の調整を行い易い形状の吸気ポートを成形できる中子を成形できる。 According to the present invention, it is possible to form a core that can form an intake port having a shape that allows easy adjustment of the swirl ratio in the cylinder head.
　本発明によれば、スワ－ル比をより容易に調整できる。また、一実施形態によれば、吸気側バルブガイドの損傷を防止できるのは勿論、工具が吸気側バルブガイドと干渉するのを防止するための手段も、講じる必要がない。したがって、その手段を設けることに基づく、コストアップが生じることがなく、加工も簡易に行うことができる。 According to the present invention, the swirl ratio can be adjusted more easily. Further, according to the embodiment, not only can the intake side valve guide be prevented from being damaged, but also means for preventing the tool from interfering with the intake side valve guide need not be taken. Therefore, there is no increase in cost based on the provision of the means, and processing can be performed easily.
本発明の一実施形態の横型水冷単気筒ディーゼルエンジンの縦断面図である。1 is a longitudinal sectional view of a horizontal water-cooled single cylinder diesel engine according to an embodiment of the present invention. 上記横型水冷単気筒ディーゼルエンジンが備えるシリンダヘッドアッセンブリの模式断面図である。It is a schematic cross section of the cylinder head assembly with which the above-mentioned horizontal type water cooling single cylinder diesel engine is provided. 上記横型水冷単気筒ディーゼルエンジンのシリンダヘッドをシリンダ側とは反対側から見たときの斜視図である。It is a perspective view when the cylinder head of the said horizontal type water cooling single cylinder diesel engine is seen from the opposite side to the cylinder side. 上記シリンダヘッドを、吸気導入ポートの入口側から見たときの斜視図である。It is a perspective view when the said cylinder head is seen from the inlet side of an intake air introduction port. 上記シリンダヘッドを、排気排出ポートの出口側から見たときの斜視図である。It is a perspective view when the said cylinder head is seen from the exit side of an exhaust discharge port. 上記シリンダヘッドを、シリンダ側から見たときの斜視図である。It is a perspective view when the said cylinder head is seen from the cylinder side. 上記シリンダヘッドを成形するための型において吸気導入ポートを成形するための中子を成形するための型の斜視図である。It is a perspective view of the type | mold for shape | molding the core for shape | molding the intake inlet port in the type | mold for shape | molding the said cylinder head. 上記中子を成形する型の上部型の斜視図である。It is a perspective view of the upper mold | type of the type | mold which shape | molds the said core. 上記中子を成形する型の下部型の斜視図である。It is a perspective view of the lower mold | type of the type | mold which shape | molds the said core. 上記上部型の螺旋成形面におけるガイドボス成形通路の周辺の部分拡大斜視図である。It is a partial expansion perspective view of the periphery of the guide boss shaping | molding channel | path in the spiral shaping | molding surface of the said upper type | mold. 上記中子により成形される吸気導入ポートの螺旋状面の等高線を示す図である。It is a figure which shows the contour line of the helical surface of the air intake introduction port shape | molded by the said core. 上記中子により成形される吸気導入ポートのシリンダ側の螺旋状面の等高線を示す図である。It is a figure which shows the contour line of the helical surface by the side of the cylinder of the intake introduction port shape | molded by the said core. 吸気導入ポートの輪郭を表す図である。It is a figure showing the outline of an intake introduction port. 図１３のＡＡ線断面図である。It is AA sectional view taken on the line of FIG. 変形例のシリンダヘッドの一部を示す斜視図である。It is a perspective view which shows a part of cylinder head of a modification. 他の変形例のシリンダヘッドの一部を示す斜視図である。It is a perspective view which shows a part of cylinder head of another modification. 更なる変形例のシリンダヘッドの一部を示す斜視図である。It is a perspective view which shows a part of cylinder head of the further modification.
　以下、本発明を図示の形態により詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to the drawings.
　図１は、本発明の一実施形態の横型水冷単気筒ディーゼルエンジンの縦断面図である。 FIG. 1 is a longitudinal sectional view of a horizontal water-cooled single cylinder diesel engine according to an embodiment of the present invention.
　図１に示すように、この横型水冷単気筒ディーゼルエンジン（以下、単に、エンジンという）は、シリンダブロック１と、シリンダヘッド２と、クランク軸３と、ピストン４とを備える。シリンダヘッド２は、シリンダブロック１に取り付けられている。 As shown in FIG. 1, the horizontal water-cooled single cylinder diesel engine (hereinafter simply referred to as an engine) includes a cylinder block 1, a cylinder head 2, a crankshaft 3, and a piston 4. The cylinder head 2 is attached to the cylinder block 1.
　図１に示すエンジンの縦断面において、上記クランク軸３は、紙面に垂直な方向に延在している。また、上記シリンダブロック１は、一つのみのシリンダ１０を有し、そのシリンダ１０は、水平長手方向に延在している。言い換えると、上記シリンダ１０は、シリンダブロック１に対して横方向に延在している。上記ピストン４は、図１に矢印Ａで示す方向にシリンダ１０内を進退するようになっている。 In the longitudinal section of the engine shown in FIG. 1, the crankshaft 3 extends in a direction perpendicular to the paper surface. The cylinder block 1 has only one cylinder 10, and the cylinder 10 extends in the horizontal longitudinal direction. In other words, the cylinder 10 extends in the lateral direction with respect to the cylinder block 1. The piston 4 advances and retreats in the cylinder 10 in the direction indicated by the arrow A in FIG.
　このエンジンは、さらに、サブタンク５と、フライホイール６と、吸気管７と、噴出口８と、エアクリーナ９と、マフラー１２と、燃料噴射装置１３とを備える。上記サブタンク５には、ラジエーター用の冷却水が戻されるようになっている。 The engine further includes a sub tank 5, a flywheel 6, an intake pipe 7, an outlet 8, an air cleaner 9, a muffler 12, and a fuel injection device 13. Cooling water for the radiator is returned to the sub tank 5.
　上記フライホイール６は、クランク軸３の端部に固定されている。上記フライホイール６は、クランク軸３の回転モーメントのバラつきを抑えると共に、回転系の慣性モーメントを増やすことによって回転速度の変化を緩やかにするために設けられている。また、上記フライホイール６を、回転させることによって、フライホイール６に運動エネルギーを蓄えるようになっている。フライホイール６を、別の機械要素にトルクを与えるエネルギー源としても利用している。 The flywheel 6 is fixed to the end of the crankshaft 3. The flywheel 6 is provided to suppress variation in rotational speed of the crankshaft 3 and to moderate changes in rotational speed by increasing the inertial moment of the rotating system. Further, by rotating the flywheel 6, kinetic energy is stored in the flywheel 6. The flywheel 6 is also used as an energy source for applying torque to another machine element.
　また、上記エアクリーナ９を通過した空気を、吸気管７を介して、シリンダ１０内の燃焼室１９に供給すると共に、ディーゼル燃料を、燃料噴射装置１３から、適切なタイミングで燃焼室１９に供給することによって、燃焼室１９でディーゼル燃料を燃焼させるようになっている。これにより、上記ピストン４を移動させることによって、クランク軸３を回転させて、負荷部材を駆動するようになっている。また、上記燃焼室１９で生じる高温の排気ガスを、マフラー１２と、噴出口８とを順に通過させている。このようにして、排気ガスを、排気音を減衰させた後、大気中へ排出するようになっている。上記噴出口８は、マフラー１２からの排気の向きを変える役割を担っている。また、このエンジンは、冷却水を、ラジエーター、シリンダブロック１、各種電装品等を通過する循環経路を循環させることにより、循環する冷却水でそれらの部位を冷却している。 The air that has passed through the air cleaner 9 is supplied to the combustion chamber 19 in the cylinder 10 via the intake pipe 7, and diesel fuel is supplied from the fuel injection device 13 to the combustion chamber 19 at an appropriate timing. Thus, diesel fuel is burned in the combustion chamber 19. Thus, by moving the piston 4, the crankshaft 3 is rotated to drive the load member. Further, the high-temperature exhaust gas generated in the combustion chamber 19 is passed through the muffler 12 and the ejection port 8 in this order. In this way, the exhaust gas is discharged into the atmosphere after the exhaust sound is attenuated. The jet port 8 plays a role of changing the direction of exhaust from the muffler 12. Further, this engine circulates cooling water through a circulation path that passes through the radiator, the cylinder block 1, various electrical components, and the like, thereby cooling those portions with the circulating cooling water.
　図２は、上記エンジンが備えるシリンダヘッドアッセンブリ２０の模式断面図である。 FIG. 2 is a schematic cross-sectional view of the cylinder head assembly 20 provided in the engine.
　シリンダは、シリンダヘッドアッセンブリ２０よりも、図２に矢印Ｂで示す図２の紙面の下側に位置している。このシリンダヘッドアッセンブリ２０は、シリンダへッド２と、吸気側バルブガイド２１とを備える。図２に示すように、上記シリンダヘッド２は、吸気導入ポート２５と、排気排出ポート２６と、吸気側バルブガイドボス２７と、排気側バルブガイドボス２８とを有する。上記吸気導入ポート２５は、吸気を、図示しない吸気マニホールド側からシリンダ１０（図１参照）側に案内する一方、排気排出ポート２６は、排気を、シリンダ１０側から図示しない排気マニホールド側に案内している。 The cylinder is located below the cylinder head assembly 20 on the lower side of the sheet of FIG. 2 as indicated by arrow B in FIG. The cylinder head assembly 20 includes a cylinder head 2 and an intake side valve guide 21. As shown in FIG. 2, the cylinder head 2 includes an intake introduction port 25, an exhaust discharge port 26, an intake side valve guide boss 27, and an exhaust side valve guide boss 28. The intake inlet port 25 guides intake air from the intake manifold side (not shown) to the cylinder 10 (see FIG. 1) side, while the exhaust discharge port 26 guides exhaust gas from the cylinder 10 side to the exhaust manifold side (not shown). ing.
　図２に示すように、上記吸気側バルブガイドボス２７は、一直線上を延在し、吸気側バルブガイドボス２７の延在方向は、シリンダ１０（図１参照）の延在方向と略一致している。上記吸気側バルブガイドボス２７は、シリンダヘッド２の外部と、吸気導入ポート２５とを連通している。また、上記排気側バルブガイドボス２８は、一直線上を延在し、排気側バルブガイドボス２８の延在方向は、シリンダ１０の延在方向と略一致している。上記排気側バルブガイドボス２８は、シリンダヘッド２の外部と、排気排出ポート２６とを連通している。 As shown in FIG. 2, the intake side valve guide boss 27 extends in a straight line, and the extending direction of the intake side valve guide boss 27 substantially coincides with the extending direction of the cylinder 10 (see FIG. 1). ing. The intake side valve guide boss 27 communicates the outside of the cylinder head 2 and the intake introduction port 25. The exhaust side valve guide boss 28 extends in a straight line, and the extending direction of the exhaust side valve guide boss 28 substantially coincides with the extending direction of the cylinder 10. The exhaust valve guide boss 28 communicates the outside of the cylinder head 2 with the exhaust discharge port 26.
　上記吸気側バルブガイド２１は、吸気側バルブガイドボス２７に圧入されている。図２に示すように、吸気側バルブガイド２１が吸気側バルブガイドボス２７の所定の位置に取り付けられた状態で、吸気側バルブガイド２１のシリンダ１０（シリンダライナ（図１に８８で示す））側の先端部９７は、吸気側バルブガイドボス２７のシリンダ１０側の開口からシリンダ１０側に突出している。 The intake side valve guide 21 is press-fitted into the intake side valve guide boss 27. As shown in FIG. 2, the cylinder 10 (cylinder liner (denoted by 88 in FIG. 1)) of the intake side valve guide 21 in a state where the intake side valve guide 21 is attached to a predetermined position of the intake side valve guide boss 27. The front end portion 97 on the side projects from the opening on the cylinder 10 side of the intake side valve guide boss 27 toward the cylinder 10 side.
　尚、図２において、参照番号２３は、後に詳述する吸気導入ポート２５の螺旋状面であり、参照番号２４は、後に詳述する吸気導入ポート２５の壁部（リップ部）である。図２に示すように、この実施形態では、上記壁部２４が、螺旋状面２３の終端（シリンダ１０側の端）９１からシリンダ１０側に延在している。図２に示すように、上記壁部２４のシリンダ１０側とは反対側の端４０は、吸気側バルブガイドボス２７のシリンダ１０側の開口（先端）９０よりもシリンダ１０側に位置している。また、上記壁部２４のシリンダ１０側とは反対側の端４０は、吸気側バルブガイド２１のシリンダ１０側の先端４１よりもシリンダ１０側に位置している。言い換えれば、螺旋状面２３の終端９１は、吸気側バルブガイドボス２７のシリンダ１０側の先端９０よりもシリンダ１０側に位置している。また、螺旋状面２３の終端９１は、吸気側バルブガイド２１のシリンダ１０側の先端４１よりもシリンダ１０側に位置している。 In FIG. 2, reference numeral 23 denotes a spiral surface of the intake air introduction port 25 described in detail later, and reference numeral 24 denotes a wall portion (lip portion) of the intake air introduction port 25 described in detail later. As shown in FIG. 2, in this embodiment, the wall portion 24 extends from the terminal end (end on the cylinder 10 side) 91 of the spiral surface 23 to the cylinder 10 side. As shown in FIG. 2, the end 40 of the wall 24 opposite to the cylinder 10 side is located closer to the cylinder 10 than the opening (tip) 90 of the intake side valve guide boss 27 on the cylinder 10 side. . Further, the end 40 of the wall 24 opposite to the cylinder 10 side is located closer to the cylinder 10 than the tip 41 of the intake side valve guide 21 on the cylinder 10 side. In other words, the terminal end 91 of the spiral surface 23 is located closer to the cylinder 10 than the tip 90 of the intake side valve guide boss 27 on the cylinder 10 side. Further, the terminal end 91 of the spiral surface 23 is located closer to the cylinder 10 than the tip 41 on the cylinder 10 side of the intake side valve guide 21.
　図３は、シリンダヘッド２をシリンダ１０側とは反対側から見たときの斜視図であり、図４は、シリンダヘッド２を、吸気導入ポート２５の入口側から見たときの斜視図である。また、図５は、シリンダヘッド２を、排気排出ポート２６の出口側から見たときの斜視図であり、図６は、シリンダヘッド２を、シリンダ１０側から見たときの斜視図である。 FIG. 3 is a perspective view when the cylinder head 2 is viewed from the side opposite to the cylinder 10 side, and FIG. 4 is a perspective view when the cylinder head 2 is viewed from the inlet side of the intake air introduction port 25. . 5 is a perspective view when the cylinder head 2 is viewed from the outlet side of the exhaust discharge port 26, and FIG. 6 is a perspective view when the cylinder head 2 is viewed from the cylinder 10 side.
　図３に示すように、このシリンダヘッド２は、４つのヘッドボルト挿通穴３０～３３を有する。各ヘッドボトル挿通穴３０～３３は、吸気側バルブガイドボス２７と略平行に延在している。各ヘッドボトル挿通穴３０～３３は、シリンダヘッド２を貫通している。図示しないヘッドボルトを、各ヘッドボトル挿通穴３０～３３に挿通した後、シリンダブロック１に締め込むことによって、シリンダヘッド２をシリンダブロック１に取り付けている。 As shown in FIG. 3, the cylinder head 2 has four head bolt insertion holes 30 to 33. Each of the head bottle insertion holes 30 to 33 extends substantially parallel to the intake side valve guide boss 27. Each head bottle insertion hole 30 to 33 penetrates the cylinder head 2. The cylinder head 2 is attached to the cylinder block 1 by inserting a head bolt (not shown) into each of the head bottle insertion holes 30 to 33 and then tightening the head bolt into the cylinder block 1.
　図４に示すように、上記吸気導入ポート２５の入口の中心は、吸気側バルブガイドボス２７の延在方向に関して、シリンダヘッド２の中央よりもシリンダヘッド２のシリンダブロック１側とは反対側に位置し、かつ、吸気側バルブガイドボス２７の中心軸と排気側バルブガイドボス２８の中心軸とを含む平面に対して、一方側に位置している。一方、図５に示すように、上記排気排出ポート２６の出口の中心は、吸気側バルブガイドボス２７の延在方向に関して、シリンダヘッド２の略中央に位置している。また、上記排気排出ポート２６の出口の中心は、図５に示すように、吸気側バルブガイドボス２７の中心軸と排気側バルブガイドボス２８の中心軸とを含む上記平面上に略位置している。また、図２および図６に示すように、上記吸気側バルブガイドボス２７の中心軸の延長線は、吸気導入ポート２５のシリンダ１０側の開口の略中心を通過する一方、排気側バルブガイドボス２８の中心軸の延長線は、排気排出ポート２６のシリンダ１０側の開口の略中心を通過している。 As shown in FIG. 4, the center of the inlet of the intake inlet port 25 is on the opposite side of the cylinder head 2 from the center of the cylinder head 2 with respect to the extending direction of the intake valve guide boss 27. And located on one side with respect to a plane including the central axis of the intake side valve guide boss 27 and the central axis of the exhaust side valve guide boss 28. On the other hand, as shown in FIG. 5, the center of the outlet of the exhaust discharge port 26 is positioned substantially at the center of the cylinder head 2 in the extending direction of the intake side valve guide boss 27. Further, as shown in FIG. 5, the center of the outlet of the exhaust discharge port 26 is located substantially on the plane including the central axis of the intake side valve guide boss 27 and the central axis of the exhaust side valve guide boss 28. Yes. 2 and 6, the extension line of the central axis of the intake side valve guide boss 27 passes through the approximate center of the cylinder 10 side opening of the intake air introduction port 25, while the exhaust side valve guide boss 27 The extension line of the central axis 28 passes through the approximate center of the opening of the exhaust discharge port 26 on the cylinder 10 side.
　図７は、シリンダヘッド２を成形する型（図示せず）において吸気導入ポート２５を成形するための中子を成形するための型４５の斜視図である。また、図８は、その中子を成形する型４５の上部型４６の斜視図であり、図９は、その中子を成形する型４５の下部型４７の斜視図である。 FIG. 7 is a perspective view of a mold 45 for forming a core for forming the intake air introduction port 25 in a mold (not shown) for forming the cylinder head 2. FIG. 8 is a perspective view of the upper mold 46 of the mold 45 for molding the core, and FIG. 9 is a perspective view of the lower mold 47 of the mold 45 for molding the core.
　図７に示すように、この中子を成形するための型（以下、中子型という）４５は、上部型４６と、下部型４７とからなり、上部型４６と、下部型４７とに分離可能となっている。中子を成形する際には、上部型４６と、下部型４７とで一体構造を構築する一方、中子を取り出す際には、上部型４６と、下部型４７とを分離するようになっている。上記上部型４６は、中子においてシリンダ１０側とは反対側に位置する吸気導入ポート２５の部分を成形する型である一方、下部型４７は、中子においてシリンダ１０側に位置する吸気導入ポート２５の部分を成形する型である。 As shown in FIG. 7, a mold (hereinafter referred to as “core mold”) 45 for molding the core includes an upper mold 46 and a lower mold 47, and is separated into an upper mold 46 and a lower mold 47. It is possible. When the core is molded, the upper mold 46 and the lower mold 47 form an integral structure. On the other hand, when the core is taken out, the upper mold 46 and the lower mold 47 are separated. Yes. The upper mold 46 is a mold for forming a portion of the intake introduction port 25 located on the opposite side of the core from the cylinder 10 side, while the lower mold 47 is an intake introduction port located on the cylinder 10 side of the core. This is a mold for molding 25 portions.
　図７に示すように、この中子型４５は、中子の形状に一致する一つの中子成形用通路４８を有する。この中子成形用通路４８の形状は、シリンダヘッド２の吸気導入ポート２５（図４参照）の形状と一致する。図７に示すように、中子成形用通路４８において吸気導入ポート２５の入口側に対応する開口５０は、略矩形の形状を有する一方、中子成形用通路４８において吸気導入ポート２５の出口側に対応する開口５１は、円形の形状を有している。 As shown in FIG. 7, the core mold 45 has one core forming passage 48 that matches the shape of the core. The shape of the core forming passage 48 matches the shape of the intake inlet port 25 (see FIG. 4) of the cylinder head 2. As shown in FIG. 7, the opening 50 corresponding to the inlet side of the intake introduction port 25 in the core forming passage 48 has a substantially rectangular shape, while the outlet side of the intake introduction port 25 in the core forming passage 48. The opening 51 corresponding to has a circular shape.
　図８に示すように、中子成形用通路４８のシリンダ１０側とは反対側の上面は、螺旋状面２３（図２参照）を成形するため螺旋成形面６０を有する。この螺旋成形面６０は、吸気側バルブガイドボス２７（図２参照）に対応するガイドボス成形通路６１の回りを取り囲むように延在している。また、図８に示すように、壁部２４を成形するための壁部成形用突出部６２が、螺旋成形面６０の開口５０側とは反対側の終端において螺旋成形面６０から離れるように一方向に突出している。上記壁部成形用突出部６２は、一体構造を有している。上記壁部成形用突出部６２は、螺旋成形面６０から突出する螺旋対応突出部分６３と、螺旋成形面６０の径方向の外側に位置する部分から突出する螺旋外側突出部分６４とを有する。 As shown in FIG. 8, the upper surface of the core forming passage 48 opposite to the cylinder 10 side has a spiral forming surface 60 for forming the spiral surface 23 (see FIG. 2). The spiral forming surface 60 extends so as to surround the guide boss forming passage 61 corresponding to the intake side valve guide boss 27 (see FIG. 2). Further, as shown in FIG. 8, the wall forming projection 62 for forming the wall portion 24 is separated from the spiral forming surface 60 at the end opposite to the opening 50 side of the spiral forming surface 60. Protrudes in the direction. The wall forming projection 62 has an integral structure. The wall forming protrusion 62 includes a spiral corresponding protruding portion 63 protruding from the spiral forming surface 60 and a spiral outer protruding portion 64 protruding from a portion located on the outer side in the radial direction of the spiral forming surface 60.
　一方、図９に示すように、中子成形用通路４８のシリンダ１０側の下面は、螺旋状面６７と、突出部収容凹部６８と、吸気導入ポート２５のシリンダ側の部分を成形するシリンダ側穴部６９とを有する。図９に示すように、螺旋状面６７および突出部収容凹部６８の夫々は、互いに独立にシリンダ側穴部６９につながっている。 On the other hand, as shown in FIG. 9, the lower surface of the core forming passage 48 on the cylinder 10 side is formed on the cylinder side for forming the spiral surface 67, the protruding portion receiving recess 68, and the cylinder side portion of the intake air introduction port 25. And a hole 69. As shown in FIG. 9, each of the spiral surface 67 and the protrusion accommodating recess 68 is connected to the cylinder side hole 69 independently of each other.
　図１０は、上部型４６の螺旋成形面６０におけるガイドボス成形通路６１の周辺の部分拡大斜視図である。 FIG. 10 is a partially enlarged perspective view of the periphery of the guide boss molding passage 61 on the spiral molding surface 60 of the upper mold 46.
　図１０に示すように、上記螺旋成形面６０は、ガイドボス成形通路６１の延在方向に関し、中子成形用通路４８の開口５０（図８参照）側から壁部成形用突出部６２に行くにしたがって序々に壁部成形用突出部６２の先端側に位置するようになっている。上記螺旋成形面６０は、図１０の紙面において、螺旋成形面６０の開口５０側の端から螺旋成形面６０の開口５０側とは反対側の終端７７に行くにしたがってスロープ状に序々に紙面１０に垂直な方向の手前側に上がっていく形状をしている。上記螺旋成形面６０は、紙面１０に垂直な方向の手前側に上がっていく途中で、ガイドボス成形通路６１の壁部成形用突出部６２の先端側の開口の縁７８と、紙面１０に垂直な方向の位置が一致している。上記螺旋成形面６０は、ガイドボス成形通路６１を取り囲むように螺旋状に延在している。図１０において、ガイドボス成形通路６１の延在方向に関し、螺旋成形面６０の開口５０側とは反対側の終端７７は、ガイドボス成形通路６１の壁部成形用突出部６２の先端側の開口の縁７８よりも壁部成形用突出部６２の先端側に位置している。また、図１０において、ガイドボス成形通路６１の延在方向に関し、螺旋成形面６０の開口５０（図８参照）側の部分７９は、上記開口の縁７８よりも壁部成形用突出部６２の先端側とは反対側に位置している。また、図１０に示すように、上記壁部成形用突出部６２は、螺旋成形面６０の開口５０側とは反対側の終端７７から図１０の紙面に垂直な方向の手前側にガイドボス成形通路６１の延在方向と略平行な方向に延在している。 As shown in FIG. 10, the spiral forming surface 60 goes from the opening 50 (see FIG. 8) side of the core forming passage 48 to the wall forming protrusion 62 in the extending direction of the guide boss forming passage 61. Accordingly, it is gradually positioned on the distal end side of the wall forming projection 62. In the paper surface of FIG. 10, the spiral forming surface 60 gradually increases in a slope shape from the end on the opening 50 side of the spiral forming surface 60 to the terminal end 77 on the opposite side to the opening 50 side of the spiral forming surface 60. It is shaped to rise to the near side in the direction perpendicular to The spiral forming surface 60 is perpendicular to the paper surface 10 and the edge 78 of the opening on the front end side of the wall portion forming protrusion 62 of the guide boss forming passage 61 on the way to the near side in the direction perpendicular to the paper surface 10. The positions in the correct direction are the same. The spiral forming surface 60 extends spirally so as to surround the guide boss forming passage 61. In FIG. 10, with respect to the extending direction of the guide boss forming passage 61, the terminal end 77 on the opposite side of the opening 50 side of the spiral forming surface 60 is the opening on the tip side of the wall portion forming protrusion 62 of the guide boss forming passage 61. It is located on the front end side of the wall portion forming protrusion 62 with respect to the edge 78. Further, in FIG. 10, with respect to the extending direction of the guide boss forming passage 61, a portion 79 on the opening 50 (see FIG. 8) side of the spiral forming surface 60 is located on the wall forming protrusion 62 rather than the edge 78 of the opening. It is located on the side opposite to the tip side. Further, as shown in FIG. 10, the wall forming protrusion 62 is formed with a guide boss from the end 77 on the opposite side to the opening 50 side of the spiral forming surface 60 to the front side in the direction perpendicular to the paper surface of FIG. The passage 61 extends in a direction substantially parallel to the extending direction of the passage 61.
　図１１は、上部型４６により成形される中子の部分により成形される吸気導入ポート２５の螺旋状面２３の等高線を示す図である。また、図１２は、下部型４７により成形される中子の部分により成形される吸気導入ポート２５のシリンダ１０側の螺旋状面８０の等高線である。 FIG. 11 is a diagram showing contour lines of the spiral surface 23 of the intake air introduction port 25 formed by the core portion formed by the upper mold 46. FIG. 12 is a contour line of the spiral surface 80 on the cylinder 10 side of the intake air introduction port 25 formed by the core portion formed by the lower mold 47.
　尚、図１１に図示された数字は、数字の値が小さくなる程、シリンダ１０側に位置することを示し、図１２に図示された数字も、数字の値が小さくなる程、シリンダ１０側に位置することを示す。また、図１１に示す形状は、螺旋成形面６０（図８参照）の形状と一致し、図１２に示す形状は、螺旋状面６７（図９参照）の形状と一致している。また、図１１において、参照番号２４は、図２に２４で示す壁部（リップ部）を示している。図１１において、壁部２４は、断面を示し、その切断面は、螺旋成形面６０の終端７７と同じ位置をとおっている。 The numbers shown in FIG. 11 indicate that the smaller the numerical value, the closer to the cylinder 10 side. The numbers shown in FIG. 12 also indicate that the numerical value decreases toward the cylinder 10 side. Indicates that it is located. Further, the shape shown in FIG. 11 matches the shape of the spiral molding surface 60 (see FIG. 8), and the shape shown in FIG. 12 matches the shape of the spiral surface 67 (see FIG. 9). Further, in FIG. 11, reference numeral 24 indicates a wall portion (lip portion) indicated by 24 in FIG. In FIG. 11, the wall portion 24 shows a cross section, and the cut surface is located at the same position as the terminal end 77 of the spiral forming surface 60.
　図１１に示すように、螺旋状面２３は、吸気マニホールド側からシリンダ１０側に行くにしたがって、序々にシリンダ１０側に位置するような螺旋形状を有している。また、図１２に示すように、吸気導入ポート２５のシリンダ１０側の螺旋状面８０も、吸気マニホールド側からシリンダ１０側に行くにしたがって、序々にシリンダ１０側に位置するようになっている。 As shown in FIG. 11, the spiral surface 23 has a spiral shape that is gradually positioned on the cylinder 10 side from the intake manifold side to the cylinder 10 side. Further, as shown in FIG. 12, the spiral surface 80 on the cylinder 10 side of the intake air introduction port 25 is gradually positioned on the cylinder 10 side as it goes from the intake manifold side to the cylinder 10 side.
　再度、図８および図９を参照して、図８に参照番号７２で示すピンの突出部を、図９に参照番号７３で示す穴に挿通すると共に、図８に参照番号７４で示す突出部を、図９に参照番号７５で示す穴に挿通して、中子型４５（図７参照）を形成するようになっている。また、この際、螺旋成形面６０の開口５０側の部分７０と、螺旋状面６７とは、互いに相俟って、壁部成形用突出部６２によって遮られて終わる螺旋形状の穴（ヘリカルポート）を構成するようになっている。中子の形状は、壁部成形用突出部６２によって遮られて終わる螺旋形状の穴の形状と一致する。中子の形状（形態）は、この説明より明らかであるので、実際の中子の図示は、省略する。 8 and 9 again, the protrusion of the pin indicated by reference numeral 72 in FIG. 8 is inserted into the hole indicated by reference numeral 73 in FIG. 9, and the protrusion indicated by reference numeral 74 in FIG. Is inserted into a hole indicated by reference numeral 75 in FIG. 9 to form a core mold 45 (see FIG. 7). Further, at this time, the portion 70 on the opening 50 side of the spiral molding surface 60 and the spiral surface 67 are coupled to each other to form a spiral hole (helical port) that ends by being blocked by the wall molding projection 62. ). The shape of the core coincides with the shape of the spiral hole that is interrupted by the wall forming projection 62. Since the shape (form) of the core is clear from this description, the illustration of the actual core is omitted.
　図１３は、吸気導入ポート２５の輪郭を表す図であり、図１４は、図１３のＡＡ線断面図である。尚、図１４において、９０は、吸気側バルブガイドボス２７（図２参照）のシリンダ１０側の端面（先端）を示し、図１３に点線で示す輪郭αは、壁部が存在しない第１の参考例の吸気導入ポートの輪郭を示す。また、図１３に二点鎖線で示す輪郭βは、壁部が、吸気側バルブガイドボス２７のシリンダ１０側の端面９０からシリンダ１０側に延在する第２の参考例の吸気導入ポートの輪郭を示し、図１３に太線（実線）で示す輪郭γは、上記実施形態の吸気導入ポート２５の輪郭を示す。また、図１４において、９１は、螺旋状面２３の終端を示す。また、図１１,１２,１４において、同じ丸で囲まれた数字で示された位置は、同じ等高線の位置を示している。 FIG. 13 is a diagram showing the outline of the intake inlet port 25, and FIG. 14 is a cross-sectional view taken along the line AA in FIG. In FIG. 14, reference numeral 90 denotes an end face (tip) of the intake side valve guide boss 27 (see FIG. 2) on the cylinder 10 side, and a contour α indicated by a dotted line in FIG. The outline of the intake port of the reference example is shown. In addition, a contour β indicated by a two-dot chain line in FIG. 13 is the contour of the intake introduction port of the second reference example in which the wall portion extends from the end surface 90 on the cylinder 10 side of the intake side valve guide boss 27 to the cylinder 10 side. The outline γ indicated by a bold line (solid line) in FIG. 13 indicates the outline of the intake air introduction port 25 of the above embodiment. In FIG. 14, reference numeral 91 denotes the end of the spiral surface 23. In addition, in FIGS. 11, 12, and 14, the positions indicated by the numbers surrounded by the same circles indicate the positions of the same contour lines.
　図２および図１４に示すように、本実施形態では、壁部（リップ部）２４のリンダ１０側とは反対側の端４０（図２参照）と一致する螺旋状面２３の終端９１が、吸気側バルブガイドボス２７のシリンダ１０側の端面（先端）よりもシリンダ１０側に位置している。 As shown in FIGS. 2 and 14, in the present embodiment, the end 91 of the spiral surface 23 that coincides with the end 40 (see FIG. 2) of the wall portion (lip portion) 24 on the opposite side to the Linda 10 side, The intake side valve guide boss 27 is positioned closer to the cylinder 10 than the end surface (tip) on the cylinder 10 side.
　また、再度、繰り返すが、図２を参照して、上記壁部２４のシリンダ１０側とは反対側の端４０が、吸気側バルブガイド２１のシリンダ１０側の先端４１よりもシリンダ１０側に位置している。また、図２を参照して、上記吸気側バルブガイド２１において吸気側バルブガイドボス２７からシリンダ１０側に飛び出している部分９５のバルブガイドボス２７の延在方向の長さは、壁部２４の延在方向（バルブガイドボス２７の延在方向）の長さの１／３よりも短くなっている。 Again, referring to FIG. 2, the end 40 of the wall portion 24 opposite to the cylinder 10 side is positioned closer to the cylinder 10 than the tip 41 of the intake side valve guide 21 on the cylinder 10 side. is doing. In addition, referring to FIG. 2, the length in the extending direction of the valve guide boss 27 of the portion 95 protruding from the intake side valve guide boss 27 to the cylinder 10 side in the intake side valve guide 21 is as follows. It is shorter than 1/3 of the length in the extending direction (the extending direction of the valve guide boss 27).
　上記実施形態によれば、吸気導入ポート２５の螺旋状面（螺旋状のスロープ）２３のシリンダ１０側の終端９１からシリンダ１０側に延在する壁部２４を備えるから、その壁部２４で吸気の旋回流（スワ－ル流）の円滑な流れを妨げて乱すことができる。また、この壁部２４の延在方向の長さ等を調整することによって、その旋回流の流れの乱れの程度も調整できる。したがって、適切なスワ－ル比への調整を容易に行うことができる。 According to the above embodiment, the wall 24 extending from the terminal end 91 on the cylinder 10 side of the spiral surface (spiral slope) 23 of the intake air introduction port 25 to the cylinder 10 side is provided. The smooth flow of the swirl flow (swirl flow) can be hindered and disturbed. Further, by adjusting the length of the wall portion 24 in the extending direction, the degree of disturbance of the swirling flow can be adjusted. Therefore, adjustment to an appropriate swirl ratio can be easily performed.
　また、上記実施形態によれば、螺旋状面２３のシリンダ１０側の終端９１が、吸気側バルブガイドボス２７のシリンダ１０側の先端９０よりもシリンダ１０側に位置しているから、螺旋状面２３の高低差の調整幅を大きくできて、この調整幅も、スワ－ル比の調整のパラメータとすることができる。したがって、スワ－ル比の調整の自由度を更に大きくできて、適切なスワ－ル比への調整を更に容易に行うことができる。 Further, according to the above embodiment, the terminal end 91 on the cylinder 10 side of the spiral surface 23 is positioned closer to the cylinder 10 than the tip 90 on the cylinder 10 side of the intake side valve guide boss 27. 23 can be increased, and this adjustment range can also be used as a parameter for adjusting the swirl ratio. Therefore, the degree of freedom in adjusting the swirl ratio can be further increased, and adjustment to an appropriate swirl ratio can be performed more easily.
　また、上記実施形態によれば、螺旋状面の終端９１が、吸気側バルブガイド２１のシリンダ１０側の先端４１よりもシリンダ１０側に位置しているから、スワ－ル比を大きくするべく、壁部２４の延在長さを短くするように壁部２４の全加工（壁部２４の最大限の加工）を行ったとしても、壁部２４の加工を行うための工具が、吸気側バルブガイド２１に干渉することがない。したがって、加工を行うための工具との接触に基づく吸気側バルブガイド２１の損傷を防止できる。また、これに加えて、工具が吸気側バルブガイド２１と干渉するのを防止するための手段、例えば、工具にその干渉を防止する逃げを形成する事等の手段を、講じる必要がなく、壁部の加工の際にバルブガイドが邪魔になることもない。したがって、その手段を設けることに基づく、コストアップが生じることもなく、加工も簡易に行うことができる。 Further, according to the above embodiment, since the end 91 of the spiral surface is located on the cylinder 10 side than the tip 41 on the cylinder 10 side of the intake side valve guide 21, in order to increase the swirl ratio, Even if the entire processing of the wall portion 24 (maximum processing of the wall portion 24) is performed so as to shorten the extending length of the wall portion 24, the tool for processing the wall portion 24 is used as the intake side valve. There is no interference with the guide 21. Therefore, it is possible to prevent the intake side valve guide 21 from being damaged due to contact with a tool for processing. In addition to this, it is not necessary to take a means for preventing the tool from interfering with the intake side valve guide 21, for example, a means for forming a relief to prevent the tool from interfering with the wall. The valve guide does not get in the way when machining parts. Therefore, the processing can be easily performed without increasing the cost based on the provision of the means.
　また、上記実施形態によれば、横型水冷単気筒ディーゼルエンジンにおいて、スワ－ル比の調整をより容易に行うことができる。また、上記実施形態の中子を成形するための型４５によれば、シリンダヘッド２においてスワ－ル比の調整を行い易い形状の吸気導入ポート２５を成形できる中子を成形できる。また、その中子を用いれば、スワ－ル比の調整を行い易い形状のシリンダヘッド２を成形できる。 Further, according to the above embodiment, the swirl ratio can be adjusted more easily in the horizontal water-cooled single cylinder diesel engine. Further, according to the mold 45 for molding the core of the above-described embodiment, it is possible to mold the core that can mold the intake air intake port 25 having a shape that allows easy adjustment of the swirl ratio in the cylinder head 2. If the core is used, the cylinder head 2 having a shape that allows easy adjustment of the swirl ratio can be formed.
　尚、上記実施形態では、螺旋状面２３の終端９１が、吸気側バルブガイド２１のシリンダ１０側の端４１よりもシリンダ１０側に位置していた。しかしながら、この発明では、螺旋状面の終端が、吸気側バルブガイドのシリンダ側の端よりもシリンダ側とは反対側に位置しても良い。 In the above embodiment, the terminal end 91 of the spiral surface 23 is located closer to the cylinder 10 than the end 41 of the intake side valve guide 21 on the cylinder 10 side. However, in the present invention, the end of the spiral surface may be located on the opposite side of the cylinder side from the cylinder side end of the intake side valve guide.
　また、上記実施形態では、吸気側バルブガイド２１において吸気側バルブガイドボス２７からシリンダ１０側に飛び出ている部分９５の吸気側バルブガイドボス２７の延在方向の長さが、壁部２４の上記延在方向の長さの１／３よりも短かった。しかしながら、この発明では、吸気側バルブガイドにおいて吸気側バルブガイドボスからシリンダ側に飛び出ている部分のバルブガイドボスの延在方向の長さは、壁部の上記延在方向の長さの１／３以上であっても良い。 Further, in the above-described embodiment, the length in the extending direction of the intake side valve guide boss 27 of the portion 95 protruding from the intake side valve guide boss 27 to the cylinder 10 side in the intake side valve guide 21 is the above-described length of the wall portion 24. It was shorter than 1/3 of the length in the extending direction. However, in the present invention, the length in the extending direction of the valve guide boss at the portion protruding from the intake side valve guide boss to the cylinder side in the intake side valve guide is 1 / of the length of the wall portion in the extending direction. It may be 3 or more.
　また、本発明の吸気導入ポートの形状が、上記実施形態の形状に限らないのは言うまでもない。例えば、上記実施形態では、図８からも理解できるように、吸気側バルブガイドボス２７の中心軸の延長線に垂直な平面で切断したとき、壁部２４の断面形状が、略矩形の形状となっている。 Needless to say, the shape of the intake port of the present invention is not limited to the shape of the above embodiment. For example, in the above embodiment, as can be understood from FIG. 8, when the cross section of the wall portion 24 is substantially rectangular when cut along a plane perpendicular to the extension line of the central axis of the intake side valve guide boss 27. It has become.
　しかしながら、この発明では、図１５、すなわち、変形例のシリンダヘッド１０２の一部を示す斜視図に示すように、吸気側バルブガイドボス１２７の中心軸の延長線に垂直な平面で切断したとき、壁部１２４の断面形状が、吸気側バルブガイドボス１２７から離れるにしたがって、末広がりになる部分を有しても良い。 However, in the present invention, as shown in FIG. 15, that is, a perspective view showing a part of the cylinder head 102 of the modified example, when cut along a plane perpendicular to the extension line of the central axis of the intake side valve guide boss 127, The cross-sectional shape of the wall portion 124 may have a portion that expands toward the end as the distance from the intake side valve guide boss 127 increases.
　また、図１６、すなわち、他の変形例のシリンダヘッド２０２の一部を示す斜視図に示すように、壁部２２４の突出高さが、図１５にしめす壁部１２４の突出高さの半分程度の高さであっても良い。 Further, as shown in FIG. 16, that is, a perspective view showing a part of the cylinder head 202 of another modification, the protruding height of the wall portion 224 is about half of the protruding height of the wall portion 124 shown in FIG. May be the height.
　また、図１７、すなわち、更なる変形例のシリンダヘッド３０２の一部を示す斜視図に示すように、吸気側バルブガイドボス３２７のシリンダ側の端面（先端）３９０から壁部３２４までの距離が、図１５に示す変形例の吸気側バルブガイドボス１２７のシリンダ側の端面（先端）１９０から壁部１２４までの距離の１／４程度であっても良い。また、上記壁部３２４の厚さも、壁部１２４の厚さの半分程度であっても良い。 Further, as shown in FIG. 17, that is, a perspective view showing a part of a cylinder head 302 of a further modification, the distance from the cylinder side end surface (tip) 390 of the intake side valve guide boss 327 to the wall portion 324 is as follows. 15 may be about ¼ of the distance from the cylinder-side end surface (tip) 190 to the wall portion 124 of the intake-side valve guide boss 127 of the modification shown in FIG. Further, the thickness of the wall portion 324 may be about half of the thickness of the wall portion 124.
　この発明では、このように、各部位の寸法および形状は、仕様によって適宜自在に変更することができる。 In the present invention, as described above, the size and shape of each part can be freely changed according to the specification.
　また、上記実施形態のエンジンは、横型水冷単気筒ディーゼルエンジであったが、この発明のエンジンは、横型のエンジンでなくて、縦型のエンジンであっても良く、水冷のエンジンでなくて、空冷のエンジンであっても良い。また、この発明のエンジンは、単気筒型のエンジンでなくて、多気筒型のエンジンであっても良い。また、この発明のエンジンは、ディーゼルエンジンでなくて、ガソリンエンジンであっても良く、タービンエンジンであっても良い。 Further, the engine of the above embodiment is a horizontal water-cooled single cylinder diesel engine, but the engine of the present invention may be a vertical engine, not a horizontal engine, not a water-cooled engine, An air-cooled engine may be used. The engine of the present invention may be a multi-cylinder engine instead of a single-cylinder engine. Further, the engine of the present invention may be a gasoline engine or a turbine engine instead of a diesel engine.
　また、この発明のエンジンは、耕耘機や田植機やトラクター等の農業機械のエンジンに搭載されれば好ましいが、この発明のエンジンを、農業機械以外の如何なる車両のエンジンに搭載しても良く、この発明のエンジンを、船舶等の車両以外の如何なる乗り物のエンジンに搭載しても良い。 The engine of the present invention is preferably mounted on an engine of an agricultural machine such as a tiller, a rice transplanter, or a tractor, but the engine of the present invention may be mounted on an engine of any vehicle other than an agricultural machine, The engine of the present invention may be mounted on any vehicle engine other than a vehicle such as a ship.
　尚、本発明のシリンダヘッドを表すデータ、本発明のシリンダヘッドを成形する型を表すデータ、本発明の中子を表すデータおよび本発明の中子を成形する型を表すデータのうちの少なくとも一つのデータの所持が、本発明の侵害の間接的な証拠になることは言うまでもない。 It should be noted that at least one of the data representing the cylinder head of the present invention, the data representing the mold for molding the cylinder head of the present invention, the data representing the core of the present invention, and the data representing the mold for molding the core of the present invention. It goes without saying that possession of one data is indirect evidence of infringement of the present invention.
　また、上記実施形態および変形例で説明した全ての構成のうちの二以上の構成を組み合わせて新たな実施形態を構築できることは、勿論である。 Of course, it is possible to construct a new embodiment by combining two or more configurations among all the configurations described in the embodiment and the modification.
　１　シリンダブロック
　２,１０２,２０２,３０２　シリンダヘッド
　３　クランク軸
　４　ピストン
　１０　シリンダ
　２０　シリンダヘッドアッセンブリ
　２１　吸気側バルブガイド
　２３　螺旋状面
　２４,１２４,２２４,３２４　壁部
　２５　吸気導入ポート
　２６　排気排出ポート
　２７,１２７,２２７　吸気側バルブガイドボス
　４０　壁部のシリンダ側とは反対側の端
　４１　吸気側バルブガイドのシリンダ側の先端
　４５　中子型
　４６　上部型
　４７　下部型
　４８　中子成形用通路
　５０　中子成形用通路において吸気導入ポートの入口側に対応する開口
　５１　中子成形用通路において吸気導入ポートの出口側に対応する開口
　６０　螺旋成形面
　６１　吸気側バルブガイドボスに対応するガイドボス成形通路
　６２　壁部成形用突出部
　７７　螺旋成形面の開口側とは反対側の終端
　７８　ガイドボス成形通路の壁部成形用突出部の先端側の開口の縁
　９０,１９０,３９０　吸気側バルブガイドボスのシリンダ側の端面（先端）
　９１　螺旋状面の終端（螺旋状面のシリンダ側の端）
　９５　吸気側バルブガイドにおいて吸気側バルブガイドボスからシリンダ側に飛び出している部分 DESCRIPTION OF SYMBOLS 1 Cylinder block 2,102,202,302 Cylinder head 3 Crankshaft 4 Piston 10 Cylinder 20 Cylinder head assembly 21 Intake side valve guide 23 Spiral surface 24,124,224,324 Wall part 25 Intake introduction port 26 Exhaust discharge port 27 , 127, 227 Intake side valve guide boss 40 End of wall portion opposite to cylinder side 41 Inlet side valve guide end on cylinder side 45 Core type 46 Upper die 47 Lower die 48 Core forming passage 50 Core Opening corresponding to the inlet side of the intake introduction port in the molding passage 51 Opening corresponding to the outlet side of the intake introduction port in the core molding passage 60 Helical molding surface 61 Guide boss molding passage corresponding to the intake side valve guide boss 62 Wall Projection part for part molding 77 Terminal end opposite to the opening side of the spiral molding surface Dobosu cylinder side end surface of the distal end side of the opening edge 90,190,390 intake valve guide boss wall portion forming the projecting portion of the molding passage (tip)
91 End of spiral surface (end of spiral surface on cylinder side)
95 Portion of the intake side valve guide protruding from the intake side valve guide boss to the cylinder side

Claims (7)

  1. 　吸気をシリンダ側に導くための吸気導入ポートと、
    　外部と、上記吸気導入ポートとを連通する吸気側バルブガイドボスとを備え、
    　上記吸気導入ポートの内面は、
    　上記吸気側バルブガイドボスの回りを吸気側からシリンダ側に螺旋状に延在する螺旋状面と、
    　その螺旋状面の上記シリンダ側の終端から上記シリンダ側に延在する壁部と
    を有し、
    　上記螺旋状面の上記終端は、上記吸気側バルブガイドボスの上記シリンダ側の先端よりも上記シリンダ側に位置していることを特徴とするシリンダヘッド。     An intake inlet port for guiding intake air to the cylinder side;
    An intake side valve guide boss communicating with the outside and the intake introduction port;
    The inner surface of the intake inlet port is
    A spiral surface extending spirally from the intake side to the cylinder side around the intake side valve guide boss;
    A wall portion extending from the end on the cylinder side of the spiral surface to the cylinder side;
    The cylinder head according to claim 1, wherein the end of the spiral surface is located closer to the cylinder than a tip of the intake side valve guide boss on the cylinder side.
  2. 　請求項１に記載のシリンダヘッドと、
    　上記吸気側バルブガイドボスに挿通されて固定された吸気側バルブガイドと
    を備え、
    　上記螺旋状面の上記終端は、上記吸気側バルブガイドの上記シリンダ側の先端よりも上記シリンダ側に位置していることを特徴とするシリンダヘッドアッセンブリ。     A cylinder head according to claim 1;
    An intake side valve guide that is inserted and fixed to the intake side valve guide boss,
    2. The cylinder head assembly according to claim 1, wherein the end of the spiral surface is located closer to the cylinder than the tip of the intake side valve guide on the cylinder side.
  3. 　請求項２に記載のシリンダヘッドアッセンブリにおいて、
    　上記吸気側バルブガイドにおいて上記吸気側バルブガイドボスから上記シリンダ側に飛び出している部分の上記バルブガイドボスの延在方向の長さは、上記壁部の上記延在方向の長さの１／３よりも短いことを特徴とするシリンダヘッドアッセンブリ。     The cylinder head assembly according to claim 2, wherein
    The length in the extending direction of the valve guide boss of the portion of the intake side valve guide that protrudes from the intake side valve guide boss to the cylinder side is 1/3 of the length of the wall portion in the extending direction. Cylinder head assembly characterized by being shorter than
  4. 　請求項１に記載のシリンダヘッドを備えるか、または、請求項２または３に記載のシリンダヘッドアッセンブリを備えることを特徴とするエンジン。 An engine comprising the cylinder head according to claim 1 or the cylinder head assembly according to claim 2 or 3.
  5. 　請求項１に記載のシリンダヘッドを備えるか、または、請求項２または３に記載のシリンダヘッドアッセンブリを備え、
    　更に、ピストンと、一つのみの上記シリンダを有するシリンダブロックとを備え、
    　上記ピストンが、上記シリンダ内を、上記シリンダブロックの高さ方向に略垂直な方向に進退するようになっていることを特徴とする横型水冷単気筒ディーゼルエンジン。     The cylinder head according to claim 1 or the cylinder head assembly according to claim 2 or 3,
    Furthermore, a piston and a cylinder block having only one of the above cylinders are provided,
    A horizontal water-cooled single-cylinder diesel engine characterized in that the piston advances and retreats in the cylinder in a direction substantially perpendicular to the height direction of the cylinder block.
  6. 　請求項１に記載のシリンダヘッドを成形するための型において上記吸気導入ポートを成形するための中子。 A core for forming the intake port in the mold for forming a cylinder head according to claim 1.
  7. 　請求項６に記載の中子を成形するための型。 A mold for molding the core according to claim 6.
PCT/JP2015/066218 2014-06-18 2015-06-04 Cylinder head, cylinder head assembly, engine, core that molds intake port for cylinder head, and die for molding said core WO2015194383A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580032707.3A CN106460720B (en) 2014-06-18 2015-06-04 Cylinder head and its component, engine, type core, the mold for forming the type core
BR112016029070A BR112016029070A2 (en) 2014-06-18 2015-06-04 cylinder head, cylinder head assembly, motor, cylinder head air inlet channel molding core, and core molding mold

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JP2014125599A JP6223288B2 (en) 2014-06-18 2014-06-18 Cylinder head, cylinder head assembly, engine, core for molding cylinder head intake port, and mold for molding the core
JP2014-125599 2014-06-18

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JPH07269361A (en) * 1994-03-30 1995-10-17 Mazda Motor Corp Multi-cylinder engine suction port structure and its setting method
JPH08246885A (en) * 1995-03-13 1996-09-24 Toyota Motor Corp Multi-intake air device for internal combustion engine
JP2000064842A (en) * 1998-08-25 2000-02-29 Kubota Corp Swirl-shaped intake port for engine
JP2005113694A (en) * 2003-10-02 2005-04-28 Toyota Motor Corp Internal combustion engine

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Publication number Priority date Publication date Assignee Title
DE4216302C2 (en) * 1992-05-16 1995-01-12 Daimler Benz Ag Swirling insert body in the intake duct of an internal combustion engine
JP4277857B2 (en) * 2006-01-27 2009-06-10 トヨタ自動車株式会社 Intake port of internal combustion engine
CN2929205Y (en) * 2006-07-04 2007-08-01 江苏常发实业集团有限公司 Screw air inlet path of single cylinder direct injection water cooling diesel engine

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH07269361A (en) * 1994-03-30 1995-10-17 Mazda Motor Corp Multi-cylinder engine suction port structure and its setting method
JPH08246885A (en) * 1995-03-13 1996-09-24 Toyota Motor Corp Multi-intake air device for internal combustion engine
JP2000064842A (en) * 1998-08-25 2000-02-29 Kubota Corp Swirl-shaped intake port for engine
JP2005113694A (en) * 2003-10-02 2005-04-28 Toyota Motor Corp Internal combustion engine

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JP2016003633A (en) 2016-01-12
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JP6223288B2 (en) 2017-11-01
CN106460720B (en) 2019-05-07

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