Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
  • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
  • F16K1/32—Details
  • F16K1/34—Cutting-off parts, e.g. valve members, seats
  • F16K1/36—Valve members
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
  • F16K1/32—Details
  • F16K1/34—Cutting-off parts, e.g. valve members, seats
  • F16K1/42—Valve seats

Definitions

• the disclosure in this specification relates to a part abutment structure.
• Patent Document 1 describes a structure in which diamond-like carbon (hereinafter, DLC) is used as the solid lubricant.
• DLC diamond-like carbon
• Patent Document 1 discloses a structure in which DLC is formed on the contact surface of one of the two components that come into contact with each other, and the contact surface of the other component, a silicon substrate, is hydrogen-terminated.
• Patent Document 1 also discloses that hydrogen-terminating the surface of the silicon substrate reduces the coefficient of friction between the DLC and the silicon substrate compared to when the surface of the silicon substrate is not hydrogen-terminated.
• This disclosure was made in consideration of the above circumstances, and aims to provide a contact structure that can prevent a decline in solid lubricating function and protect the contact surfaces in a part that brings two members into contact with each other.
• the present disclosure provides: a first member and a second member each having an abutment surface that abuts against each other in the presence of hydrogen, at least one of the first member and the second member being a movable part; the contact surface of the first member is configured as a first contact surface provided with a lubricating film at least a portion of which is hydrogen-terminated, The contact surface of the second member is configured as a second contact surface provided with a catalyst portion having a function of dissociating hydrogen into hydrogen radicals.
• contact can expose dangling bonds in the initially hydrogen-terminated lubricating film on the first contact surface.
• hydrogen in the environment where the contact structure is provided reacts with the catalyst portion of the second contact surface, generating hydrogen radicals due to the catalytic function of the catalyst portion. These hydrogen radicals then bond with the dangling bonds in the lubricating film.
• hydrogen is continuously supplied to the lubricating film by the hydrogen in the environment, restoring hydrogen termination. This maintains the solid lubricating function of the lubricating film. As a result, the contact surface can be protected.
• FIG. 1 is a longitudinal cross-sectional view of a fuel injection valve
• FIG. 2 is an explanatory diagram showing the relationship between the valve body and the injection hole
• FIG. 3 is a diagram for explaining the state of the contact surfaces when two members contact each other
• FIG. 4 is a diagram for explaining a reaction between a catalyst portion and hydrogen
• FIG. 5 is a diagram for explaining chemical reactions that occur when the fuel injection valve is opened and closed.
• FIG. 6 is a longitudinal cross-sectional view of a fuel injection valve showing the location of the lubricating film and catalyst portion
• FIG. 7 is a diagram for explaining the state of the contact surface of the sliding portion
• FIG. 8 is a longitudinal cross-sectional view of a valve body according to another embodiment
• FIG. 9 is a longitudinal sectional view of a bearing according to another embodiment.
• the abutment structure of this embodiment is applied as a component to a hydrogen injector.
• the hydrogen injector is applied to a direct-injection gas engine (internal combustion engine) that uses hydrogen gas, and the hydrogen gas is directly injected into the combustion chamber of the gas engine by the hydrogen injector.
• Hydrogen gas is a gas produced, for example, by vaporizing liquefied hydrogen stored in a hydrogen cylinder through reduced pressure, and corresponds to a hydrogen-containing gas.
• the gas engine is, for example, an automotive engine.
• the fuel injection system equipped with a fuel injection valve as a hydrogen injector is a so-called low-pressure direct injection system in which compressed hydrogen gas at around several MPa is injected from the fuel injection valve into the combustion chamber.
• Figure 1 shows a longitudinal cross-sectional structure of the main parts of fuel injection valve 10.
• the direction in which the central axis of fuel injection valve 10 extends i.e., the vertical direction in Figure 1
• the direction in which the central axis of fuel injection valve 10 extends is referred to as the axial direction
• the direction extending radially from the axis is referred to as the radial direction
• the direction extending circumferentially around the axis is referred to as the circumferential direction.
• the upper side is the base end side (upstream side) of fuel injection valve 10
• the lower side is the tip side (downstream side).
• the fuel injection valve 10 includes a cylindrical housing 11 having a fuel passage 12 therein.
• the housing 11 is made of a magnetic material, and a non-magnetic portion 11a made of a non-magnetic material is provided in the axial middle portion.
• the housing 11 has a cylindrical hollow portion, and the fuel passage 12 is formed by this hollow portion extending in the axial direction. Hydrogen gas is supplied to the fuel passage 12 from the axial base end side (upper side in the figure).
• the fuel passage 12 corresponds to the "gas passage”
• the housing 11 corresponds to the "main body.”
• the housing 11 has a cylindrical portion 13 and an end plate portion 14 provided at the axial tip of the cylindrical portion 13.
• the end plate portion 14 has an injection hole 14a that injects hydrogen gas into the engine combustion chamber.
• the injection hole 14a is surrounded by a valve seat 15 provided in the center of the end plate portion 14.
• the fuel injection valve 10 is assembled to the gas engine so that the end plate portion 14 is exposed inside the combustion chamber.
• the end plate portion 14 does not necessarily have to be flat, extending perpendicular to the axial direction as shown, and may be conical, for example, with a convex tip.
• a fixed core 20 made of a magnetic material is fixed within the housing 11.
• the fixed core 20 has multiple communication passages 21 that connect the upstream side and downstream side, and within the fuel passage 12, hydrogen gas can flow from the upstream side of the fixed core 20 to the downstream side via the communication passages 21.
• a movable core 30 made of a magnetic material is disposed within the fuel passage 12 on the upstream side of the fixed core 20, in other words, on the opposite side of the injection hole 14a in the axial direction across the fixed core 20.
• the movable core 30 is capable of reciprocating axially along the inner circumferential surface of the cylindrical portion 13.
• the movable core 30 has multiple communication passages 31 that communicate with each other in the axial direction. It is preferable that the communication passages 31 are located in positions that are axially continuous with the communication passages 21 of the fixed core 20.
• the housing 11 is provided with a position restriction portion 16 that restricts the axial position of the movable core 30.
• the movable core 30 is movable in the axial direction between the position restriction portion 16 and the fixed core 20.
• the downstream end face of the movable core 30 and the upstream end face of the fixed core 20 face each other and are parallel to each other.
• the movable core 30 corresponds to the "operating portion.”
• a valve element 40 that opens and closes the injection hole 14a is located downstream of the movable core 30.
• the valve element 40 is needle-shaped and is inserted into the insertion hole 22 of the fixed core 20.
• the valve element 40 is an external opening valve that opens when moved outside the housing.
• the valve body 40 has a tip valve portion 41 provided at the axial tip, and a shaft portion 42 extending from the tip valve portion 41.
• the tip valve portion 41 is conical, and the shaft portion 42 is provided integrally with the conical apex of the tip valve portion 41.
• the upper axial end of the shaft portion 42 abuts against the movable core 30.
• a flange portion 43 is provided at the end of the shaft portion 42 opposite the tip valve portion 41.
• a spring 44 made of a compression coil spring is provided between the flange portion 43 and the fixed core 20.
• the valve element 40 is inserted into the injection hole 14a, and the tip valve portion 41 closes the injection hole 14a from outside the housing. In this case, the injection hole 14a is opened when the tip valve portion 41 moves away from the end plate portion 14.
• the valve element 40 is preferably made of a metal material, a non-metal material, or another non-elastomer material with excellent heat resistance.
• a solenoid coil 17 is provided in the housing 11.
• the solenoid coil 17 is energized by a current-carrying circuit (not shown)
• the movable core 30 is displaced toward the fixed core 20.
• the valve body 40 moves toward the valve-opening side (downward in the figure) against the biasing force of the spring 44.
• the valve seat 15 has a tapered surface that is inclined with respect to the axial direction.
• the side surface of the conical portion is the opposing seat portion 45 that faces the valve seat 15.
• the opposing seat portion 45 corresponds to the "opposing surface.”
• valve seat 15 on the housing 11 side and the opposing seat portion 45 on the tip valve portion 41 side abut against each other.
• a lubricating film 18 is formed on the valve seat 15, and a catalyst portion 47 is formed on the opposing seat portion 45.
• the lubricating film 18 is formed from a solid lubricant, at least a portion of which is hydrogen-terminated.
• a carbon-based material, specifically diamond-like carbon, is preferably used as the solid lubricant for the lubricating film 18.
• the lubricating film 18 may contain elements other than carbon and hydrogen.
• the catalytic portion 47 is formed from a catalyst that has the function of dissociating hydrogen into hydrogen radicals.
• a metal oxide such as zirconium oxide or cerium oxide is used for the catalytic portion 47.
• a precious metal such as platinum or palladium may also be used for the catalytic portion 47.
• the catalytic portion 47 is provided in the form of a film or layer on the counter seat portion 45.
• the catalytic portion 47 may also be provided in the form of particles on the counter seat portion 45, and more specifically, may be provided in the form of nanoparticles.
• the valve body 40 of the fuel injection valve 10 is heated by heat received from the combustion chamber, which is a heat source.
• the catalyst portion 47 of the seat portion 45 is activated by heat received from the combustion chamber when the engine is running.
• the housing 11 corresponds to the "first member,” and the valve seat 15 and the lubricating film 18 form a "first contact surface.” Furthermore, the valve body 40 corresponds to the "second member,” and the seat-facing portion 45 and the catalyst portion 47 form a "second contact surface.”
• the lubricating film 18 and the catalyst portion 47 have different hardnesses. Specifically, it is preferable that the lubricating film 18 is softer than the catalyst portion 47, and that the state of the chemical bond in the lubricating film 18 changes when the lubricating film 18 and the catalyst portion 47 come into contact.
• the valve body 40 may also have a catalyst portion 48 provided in the stem portion 42.
• the catalyst portion 48 in the stem portion 42 may have the same configuration as the catalyst portion 47 in the opposing seat portion 45, or it may have a different configuration.
• the catalyst portion 47 in the opposing seat portion 45 may be made of a metal oxide such as zirconium oxide or cerium oxide, while the catalyst portion 48 in the stem portion 42 may be made of a precious metal such as platinum or palladium.
• the catalyst portion 47 is provided in the form of a film or layer in the opposing seat portion 45, while the catalyst portion 48 is provided in the form of particles in the stem portion 42.
• Figure 3(a) shows, as a comparative example, a movable member 60 and a fixed member 70 in which dangling bonds are exposed at the interface between the members and the space.
• (b) when the movable member 60 and the fixed member 70 come into contact with each other, the dangling bonds of each member bond together.
• the chemical bonding force between the contacting surfaces is constantly acting on each other, which raises concerns about an increase in the frictional force between the contacting surfaces.
• hydrogen derived from the fuel is present around the valve body 40.
• the hydrogen is dissociated by the catalytic function of the catalyst portion 47 in the valve body 40, generating hydrogen radicals.
• the generated hydrogen radicals bond with exposed dangling bonds in the lubricating film 18. This reduces the number of exposed dangling bonds in the lubricating film 18, and the lubricating film 18 is hydrogen-terminated, thereby reducing friction between the lubricating film 18 and the catalyst portion 47.
• Figures 5(a) to 5(d) are diagrams illustrating the chemical reactions that occur when the fuel injection valve 10 is opened or closed.
• FIG 5(a) shows the fuel injection valve 10 in an open state.
• the hydrogen atoms fixed to the lubricating film 18 are not shown.
• hydrogen is present around the valve body 40.
• the tip valve portion 41 abuts against the valve seat 15.
• the catalyst portion 47 dissociates hydrogen due to thermal energy received from the engine combustion chamber and kinetic energy when the tip valve portion 41 abuts, generating hydrogen radicals.
• the stem portion 42 of the valve body 40 becomes hot along with the tip valve portion 41, and hydrogen radicals are also generated in the catalyst portion 48 of the stem portion 42 due to hydrogen dissociation.
• the generated hydrogen radicals bond to the exposed dangling bonds of the lubricating film 18, thereby hydrogen-terminating the lubricating film 18.
• a lubricating film 18 is formed on the valve seat 15 on the housing 11 side, and a catalyst portion 47 is provided on the opposing seat portion 45 on the valve body 40 side. Therefore, even if dangling bonds are exposed in the lubricating film 18 when the valve seat 15 and the tip valve portion 41 come into contact, hydrogen radicals generated by the catalytic function of the catalyst portion 47 will bond with the dangling bonds. This maintains the solid lubricating function of the lubricating film 18. As a result, the contact portion of the fuel injection valve 10 can be protected.
• the catalytic section 47's function of dissociating hydrogen into hydrogen radicals is properly demonstrated under specified high-temperature conditions.
• the tip valve section 41 on which the catalytic section 47 is provided becomes hot due to heat received from the engine combustion chamber, which increases the frequency with which exposed dangling bonds in the lubricating film 18 bond with hydrogen radicals.
• a catalyst portion 48 is provided in the stem portion 42, which allows hydrogen gas to come into contact with the catalyst upstream of the lubricating film 18 on the valve seat 15. This increases the amount of hydrogen radicals generated by the catalytic function, and when dangling bonds are exposed in the lubricating film 18, the dangling bonds and hydrogen radicals bond more frequently.
• a lubricating film and a catalyst portion are provided at the contact portion between the cylindrical portion 13 of the housing 11 and the movable core 30.
• the inner circumferential surface 13a of the cylindrical portion 13 and the outer circumferential surface 30a of the movable core 30 are in contact with each other in a slidable manner, and the movable core 30 slides against the cylindrical portion 13 when the valve body 40 is opened or closed.
• a lubricating film 32 is formed on the outer peripheral surface 30a of the movable core 30, and a catalyst portion 19 is formed on the inner peripheral surface 13a of the cylindrical portion 13.
• the outer peripheral surface 30a of the movable core 30 and the lubricating film 32 form a "first abutment surface,” and the inner peripheral surface 13a of the cylindrical portion 13 and the catalyst portion 19 form a "second abutment surface.”
• the lubricating film 32 is formed from a solid lubricant that is at least partially hydrogen-terminated, and it is preferable that a carbon-based material be used as the solid lubricant.
• the catalyst portion 19 is formed from a catalyst that has the function of dissociating hydrogen into hydrogen radicals. The configuration of the catalyst portion 19 needs to be the same as that of the catalyst portion 47. It is preferable that the catalyst portion 19 is provided on the portion of the inner circumferential surface 13a of the cylindrical portion 13 that abuts against the outer circumferential surface 30a of the movable core 30.
• the lubricating film 32 and the catalyst portion 19 have different hardnesses. Specifically, it is preferable that the lubricating film 32 is softer than the catalyst portion 19, and that the state of the chemical bond in the lubricating film 32 changes when the lubricating film 32 and the catalyst portion 19 come into contact.
• the movable core 30 slides with its outer peripheral surface 30a in contact with the inner peripheral surface 13a of the cylindrical portion 13. This sliding movement raises concerns that dangling bonds may be exposed at the contact surface. Hydrogen flowing in from the fuel passage 12 may be present in the tiny clearance between the cylindrical portion 13 and the movable core 30. Therefore, the catalyst portion 19 dissociates the hydrogen through its catalytic function, generating hydrogen radicals. The generated hydrogen radicals then bond with the exposed dangling bonds in the lubricating film 32. This reduces the number of exposed dangling bonds in the lubricating film 32.
• the lubricating film 32 is hydrogen-terminated, reducing friction between the lubricating film 32 and the catalyst portion 19 compared to when dangling bonds remain exposed in the lubricating film 32. This protects the sliding surfaces of the movable core 30 and the cylindrical portion 13.
• the white circles representing the lubricating film 32 represent the atoms that make up the lubricating film 32.
• the black circles representing the catalyst portion 19 represent the atoms that make up the catalyst portion 19.
• the catalyst portion provided at the contact portion between the valve seat 15 and the opposing seat portion 45 may have a different configuration from the catalyst portion provided at the contact portion between the cylindrical portion 13 of the housing 11 and the moving core 30 (catalyst portion 19 on the cylindrical portion 13 side). Note that catalyst portion 47 corresponds to the "first catalyst portion,” and catalyst portion 19 corresponds to the "second catalyst portion.”
• the abutment portion between the valve seat 15 and the opposing seat portion 45 is the portion where the valve seat 15 and the opposing seat portion 45 come into contact as the opposing seat portion 45 butts against the valve seat 15.
• the abutment portion between the cylindrical portion 13 of the housing 11 and the movable core 30 is the portion where the cylindrical portion 13 and the movable core 30 come into contact in a sliding state. Because the load and surface pressure on the catalyst portion differ at each of these abutment portions, it is advisable to configure the catalyst portion taking these differences into consideration.
• the thickness of the catalyst portion 47 is greater than the thickness of the catalyst portion 19. In this case, by providing a thicker catalyst portion in the area where a greater load is applied, the strength of the catalyst portion can be increased.
• the catalyst portion 47 is preferably a film-like or layer-like metal oxide with high strength, and the catalyst portion 19 is preferably a particulate precious metal with lower strength than the film-like or layer-like metal oxide.
• the contact structure of the present disclosure was applied to an injection valve that injects hydrogen gas as a hydrogen-containing gas, but this may be modified to apply the contact structure of the present disclosure to an injection valve that injects other hydrogen-containing gases, such as CNG (Compressed Natural Gas) or LNG (Liquefied Natural Gas).
• CNG Compressed Natural Gas
• LNG Liquefied Natural Gas
• the fuel injection valve 10 may be configured such that the movable core 30 and the valve element 40 are integral.
• the fuel injection valve 10 is configured such that a lubricating film 32 is provided on the outer surface of the valve element 40 that abuts against the inner surface 13a of the cylindrical portion 13.
• the component structure of the present disclosure was applied to a hydrogen injection valve that directly injects hydrogen gas into the combustion chamber of a gas engine, but this may be modified to apply the component structure of the present disclosure to an injection valve for port injection.
• valve body 40 has an outward opening valve structure, but this may be modified so that the valve body 40 has an inward opening valve structure.
• the seating portion 45 on which the catalyst portion 47 is formed may have an uneven shape.
• a recess 46 extending in the circumferential direction is formed in the seating portion 45 of the tip valve portion 41.
• the recess 46 may be provided as multiple axially arranged windings or in a spiral shape on the seating portion 45, which forms a conical side surface.
• the depth of the recess 46 may be on the order of micrometers. The amount of hydrogen radicals generated by the reaction between hydrogen and the catalyst portion 47 increases as the surface area of the catalyst portion 47 increases.
• the contact surface on which the catalyst portion 47 is formed have an uneven shape, the amount of dissociated hydrogen increases, and therefore the amount of hydrogen radicals supplied to the lubricating film 18 increases. This increases the frequency with which dangling bonds in the lubricating film 18 bond with hydrogen radicals when they are exposed.
• the valve body 40 may be made of a porous metal material, with the pores in the porous metal material forming recesses on the valve body surface.
• the valve body 40 is configured to have a catalyst portion 48 on the stem 42 in addition to the opposing seat portion 45 of the tip valve portion 41, but this may be modified so that the catalyst portion 48 is not provided on the stem 42.
• a lubricating film and a catalyst portion are provided on the abutment portion between the cylindrical portion 13 of the housing 11 and the movable core 30, but this may be modified so that the abutment portion between the cylindrical portion 13 and the movable core 30 does not have a lubricating film or a catalyst portion.
• the hydrogen present around the abutment structure of the present disclosure may be in either a gaseous or liquid state.
• the catalysts that form catalytic portions 47, 48, and 19 are not limited to metal oxides and precious metals. Specifically, they may be catalysts containing transition elements other than precious metals that have the function of dissociating hydrogen into hydrogen radicals.
• the component abutment structure disclosed herein can be applied to abutting parts that repeatedly come into and out of contact with each other, sliding parts that slide against each other, and rolling parts.
• rolling parts include bearings and engine valve mechanisms.
• FIG 9 is a cross-sectional view of the bearing 80 taken along the rotational axis.
• the bearing 80 comprises an outer ring member 81, an inner ring member 82, and a plurality of rolling elements 83 (specifically, cylindrical rollers) arranged between the outer ring member 81 and the inner ring member 82.
• the rolling elements 83 are supported so that they can rotate relative to the outer ring member 81 and the inner ring member 82, with their cylindrical side surfaces in contact with the outer ring member 81 and the inner ring member 82.
• a shaft body 90 which is rotatably supported by the bearing 80, is fixed to the inner ring member 82. When the shaft body 90 rotates, the inner ring member 82 rotates integrally with the shaft body 90, and the rolling elements 83 rotate in conjunction with the rotation of the inner ring member 82.
• a catalyst portion 85 is formed on the outer peripheral surface 83a of the rolling element 83. Furthermore, lubricating films 86, 87 are formed on the opposing surfaces 81a, 82a of the outer ring member 81 and the inner ring member 82 that face the outer peripheral surface 83a of the rolling element 83. Similar to the lubricating film 18 described above, the lubricating films 86, 87 are formed from a solid lubricant, at least a portion of which is hydrogen-terminated, and it is preferable that a carbon-based material be used as the solid lubricant. Furthermore, similar to the catalyst portion 47 described above, the catalyst portion 85 is formed from a catalyst that has the function of dissociating hydrogen into hydrogen radicals. The configuration of the catalyst portion 85 may be the same as that of the catalyst portion 47.
• Configuration 3 3.
• the present invention is applied to a hydrogen injection valve (10) that injects hydrogen-containing gas
• the hydrogen injector is a main body (11) having a gas passage (12) through which a hydrogen-containing gas passes and an injection hole (14a) through which the hydrogen-containing gas in the gas passage is injected; a valve body (40) that opens and closes the injection hole, the valve body has a tip valve portion (41) at the axial tip of the hydrogen injector, The tip valve portion abuts against a valve seat (15) provided in the main body portion so as to surround the injection hole, the valve seat is the first abutment surface,
• the catalyst portion provided in the tip valve portion is a first catalyst portion (47),
• the catalyst portion provided on the sliding surface is a second catalyst portion (19), 8.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Fuel-Injection Apparatus (AREA)
• Lift Valve (AREA)

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Citations (5)

• 2024
  • 2024-04-09 JP JP2024062749A patent/JP2025159900A/ja active Pending
• 2025
  • 2025-03-18 WO PCT/JP2025/010361 patent/WO2025216019A1/ja active Pending

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