JP3333539B2 - Gas fuel injection valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gaseous fuel injection valve.

[0002]

2. Description of the Related Art Conventionally, a movable body having a valve body capable of opening and closing a valve hole is slidably fitted in a valve housing having a valve hole at a distal end, and the valve hole is opened by exciting a coil. An injection valve for injecting a liquid fuel such as gasoline by moving a movable body is disclosed in, for example, Japanese Utility Model Laid-Open No. 3-27875.
It is known from Japanese Patent Application Laid-Open Publication No. H10-15095 that such an injection valve can be applied to a gas fuel injection valve.

[0003]

However, if the above-mentioned conventional fuel injection valve is used as it is as a gaseous fuel injection valve,
The sliding operation of the movable body in the valve housing may be hindered. In other words, when liquid fuel was used, the lubricating action between the movable body and the valve housing was fulfilled by the liquid fuel. On the other hand, such a lubricating action could not be expected with the gaseous fuel, and wear due to metal contact increased. , Malfunction may occur.

As a countermeasure, it is easy to enclose lubricating oil between the movable body and the valve housing. However, the sliding resistance at the seals on both sides for enclosing the lubricating oil increases, and the responsiveness is reduced. It may decrease. Also, if the seal is loosened to reduce the sliding resistance, the lubricating oil will flow out over a long period of use, and not only will the lubricating effect be lost, but the lubricating oil will be mixed into the fuel and cause trouble. Becomes

The present invention has been made in view of the above circumstances, and provides a gaseous fuel injection valve capable of injecting gaseous fuel while reducing wear of a movable body and sliding resistance. Aim.

[0006]

According to a first aspect of the present invention, there is provided a valve housing, comprising :
And the valve housing is connected to the gaseous fuel passage in the valve housing.
A valve hole that opens at the end of the jing is formed, and the outer peripheral surface of a movable body having a valve body that can open and close the valve hole at the end is formed by a valve housing.
Gaseous fuel jets slidably fitted to the inner circumferential surface of the fuel
In the firing valve, the valve housing is made of a magnetic material,
Between the valve housing and the movable body, the solid in the valve housing
Filled with magnetic fluid held by a fixed permanent magnet ,
The permanent magnet is attached to the valve housing by opening the outer surface of the housing.
Buried through the mouth and not exposed to the inner peripheral surface
You .

According to a second aspect of the present invention, a valve housing is provided.
To the gaseous fuel passage in the valve housing
And a valve hole opening at the tip of the valve housing.
An outer peripheral surface of a movable body provided with a valve body capable of opening and closing a valve hole at an end thereof is axially slidably fitted to an inner peripheral surface of a valve housing.
Gas fuel injection valve, wherein the valve housing is made of a magnetic material.
And manufacturing, between the valve housing and the movable body, the magnetic fluid held by the fixed permanent magnet valve housing Ru is filled at a position spaced in the direction of movement of the movable member co
, The lubrication oil is sealed between the magnetic fluid each other, the permanent
The magnet is provided in the valve housing by opening the outer peripheral surface of the housing.
It is buried without passing through and exposing to the inner peripheral surface .

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional side view of a gaseous fuel injection valve, and FIG. 2 is an enlarged view of a part of FIG.

First, in FIG. 1, a housing 1 of this gaseous fuel injection valve is provided with a valve formed of a soft magnetic material on a tip of a housing body 3 formed of a magnetic metal and having a basically cylindrical shape. The housing 5 is continuously provided, and the rear end of the housing body 3 is closed by a lid member 6 made of a magnetic metal.

The valve housing 5 has a metal ring 8 interposed between the valve housing 5 and a support flange 7 which protrudes inward in the radial direction on the inner surface of the intermediate portion near the front end of the housing body 3, and is mounted on the front end of the housing body 3. It is inserted. In the fitted state, the distal end of the housing main body 3 is crimped inward and bent to engage with the outer surface of the valve housing 5, whereby the valve housing 5 is fixed to the distal end portion of the housing main body 3.

Referring also to FIG. 2, a valve hole 9 and a tapered valve seat 10 connected to the valve hole 9 are provided at the center of the distal end of the valve housing 5. The valve housing 5 is housed plunger 12 ₁ rod-shaped with a valve body 11 tapered capable seated on the valve seat 10 to the tip, the outer peripheral surface of the plunger 12 _1, radius at the tip end A guide portion 13 protrudes outward in the direction, and a guide portion 14 protrudes radially outward on the axial rear side of the guide portion 13.

The inner peripheral surface of the valve housing 5 and the plunger 12
_{1 A} magnetic fluid 15 is filled between the guide portions 13 and 14 on the outer peripheral surface over the entire circumference thereof, and permanent magnets 16 and 17 for holding the magnetic fluid 15 are provided with the guide portions 13 and 14. 14, the magnetic fluid 15 is surrounded by the valve housing 5 so as to surround the magnetic fluid 15 respectively .
It is embedded without exposed to and the inner peripheral surface thereof through an opening (i.e. a sliding guide surface for the plunger 12 _1).

The lid member 6 is connected to the rear end of the housing body 3 by caulking, and integrally has a cylindrical fixed core 18 extending coaxially inside the housing body 3. A bobbin 19 surrounding the fixed core 18 is sandwiched between the support flange 7 of the housing body 3 and the lid member 6.
A coil 20 is wound around the bobbin 19. Fixed core 1
A movable core 21 slidably fitted on the inner peripheral surface of the support flange 7 is disposed in front of the movable core 8. On the other hand, plunger 12
The rear end of the ₁ serves to penetrate movably metal ring 8, the rear end of the plunger 12 ₁ is fixed to the movable core 21. Plunger 12 ₁ and the movable core 21 Thus constitutes the movable member 22 _1.

The cover member 6 is provided integrally with an extension tube 23 extending coaxially with the fixed core 18 and extending rearward. The fixed core 18 and the extension tube 23 are provided with through holes 24. The sleeve 25 is pressed into the through hole 24. A return spring 2 is provided between the movable core 21 and the sleeve 25.
6 is contracted. Therefore, the movable body 22 ₁ is provided with the return spring 2
The spring force of No. 6 urges the valve body 11 forward, that is, the direction in which the valve body 11 is seated on the valve seat 10.

[0016] the rear of the extension tube 23 has a filter 27 is attached, the movable member 22 _1, passageway 28 leading to the sleeve 25 is bored coaxially. In addition, plunger 12
_{In FIG. 1} , a communication hole 29 is opened on the front side of the guide portion 13, and a passage 28 is formed through the communication hole 29 through the communication hole 29.
Plunger 12 ₁ of the front portion outer periphery than the guide portion 13 and the leaflet
And communicating with the annular oil passage between the Ujingu inner 5 circumferential, annular oil passage
Is a part of the gaseous fuel passage together with the passage 28 and the communication hole 29.
Eggplant

The rear end of the housing body 3 and the lid member 6
A coupler 30 made of synthetic resin is coupled to cover the rear end of the housing body 3 and the cover member 6, and a pair of coupler terminals 31 exposing the rear end inside the coupler 30 are connected to the coil 20. Connected to.

[0018] Next, to explain the action of this first embodiment, the movable member 22 ₁ is operated in the axial direction by the switching of the excitation and demagnetization of the coil 20, the valve opening, that is, when the plunger 1
When the valve hole 9 2 ₁ of the valve body 11 is moved away from the valve seat 10 is opened, the sleeve 25 within the filter 27, the gas fuel flowing into the front end of the valve housing 5 through the passage 28 and the communication holes 29 , Are ejected from the valve hole 9.

In such a gaseous fuel injection valve, the movable body 2
2 plunger 12 _first guide portions 13 and 14 in ₁
And the front end of the housing 1, that is, the space between the valve housing 5 and the magnetic fluid 15 held by the permanent magnets 16 and 17, respectively, are filled, so that the magnetic fluid 15 performs a lubricating action. The increase in wear due to direct contact between metals is suppressed,
₍₁₎ The responsiveness can be improved by reducing the sliding resistance.

FIGS. 3 and 4 show a second embodiment of the present invention, in which parts corresponding to those in the first embodiment are denoted by the same reference numerals.

[0021] the plunger 12 ₂ which is a component of the movable member 22 _2, 'and the guide portion 13' guide portion 13 and the guide portion 14 of the spaced locations to the rear is provided from the front side A plurality of flat notches 32 are provided on the outer surface of the guide portion 13 'at intervals in the circumferential direction.
The inner surface of the valve housing 5, which is the front end of the housing 1, at four locations in the circumferential direction excluding the notches 32 and the guide 1
3 ', a plurality of permanent magnets 16' for holding the magnetic fluid 15 are filled.
The valve housing 5, the inner peripheral surface of and its <br/> through an opening in the outer peripheral surface (i.e. the slide guide surface for the plunger 12 ₂₎
It is buried without being exposed. Thus , gas is introduced between the guide portion 13 'and the valve housing 5 and between the magnetic fluids 15.
A flow passage 33 forming a part of the fuel passage is formed.

Further to the movable body 22 ₂ 'together are provided coaxially, the guide portion 13' passageway 28 for guiding the gaseous fuel, leading to the opening to passageway 28 'to the outer surface of the plunger 12 ₂ between 14 A communication hole 29 'is provided.

According to the second embodiment, the movable body 22 'moves rearward and the valve body 11 separates from the valve seat 10 and the valve hole 9
Is opened, gaseous fuel is ejected from the valve hole 9 through the passage 28 ', the communication hole 29 and the flow passage 33. Moreover plunger 12 ₂ of the guide portion 13 in the movable member 22 ₂ ', and 14, between the front end portion or the valve housing 5 in the housing 1, the permanent magnet 16', the magnetic fluid 15 retained by the 17 are filled respectively Therefore, as in the first embodiment, it is possible to suppress an increase in wear and improve responsiveness.

FIG. 5 shows a third embodiment of the present invention, and portions corresponding to the above embodiments are given the same reference numerals.

[0025] In the front end portion of the housings 1, the valve housing 5, the movable core 21 and the plunger 12 ₄ constituting the movable member 22 ₄ is housed, spaced in the axial direction of the plunger 12 ₄ Plunger 1 in two places
2 Between ₄ and the valve housing 15, the magnetic fluid 15 over the entire circumference is filled respectively, their magnetic fluid 15 in the valve housing 5, 且through an opening in the outer peripheral surface
One is held respectively by the permanent magnets 16 and 17 are embedded without exposed to (sliding guide surface for the words plunger 12 ₄₎ inner peripheral surface. Moreover Between the plunger 12 ₄ and the valve housing 5 between both magnetic fluid 15, the lubricating oil 41 is sealed so as to be respectively sealed at both axial ends by the magnetic fluid 15.

On the other hand, further in front than the arrangement position of the front side of the magnetic fluid 15 along the axial direction of the plunger 12 _4,
Between the plunger 12 ₄ and the valve housing 5, the gas fuel
An annular chamber 42 forming a part of the fuel passage is formed, and an inlet 43 for introducing gaseous fuel into the annular chamber 42 is formed in the valve housing 5.

According to this third embodiment, since the lubricating oil 41 is lubrication between the movable member 22 ₄ and the valve housing 5 is performed, it is possible to suppress the wear of the plunger 12 ₄ and the valve housing 5. In addition, since the seal on both sides of the lubricating oil 41 is performed by the magnetic fluid 15, the sliding resistance at the seal portion does not increase, and a decrease in responsiveness can be avoided. Further, the lubricating oil 41 does not flow out even when used for a long period of time due to the sealing with the magnetic fluid 15, so that trouble caused by mixing of the lubricating oil 41 into the gaseous fuel can be avoided.

In the above embodiment, the movable members 22 ₁ , 22 ₂ ,
22 ₄ has been so allowed to electromagnetically actuated, the present invention is not limited to those of such electromagnetic, widely applicable to gaseous fuel injection valve so as allowed to operate the movable member by various drive sources It is.

[0029]

As described above, according to the first aspect of the present invention , the gaseous fuel in the valve housing is passed through the valve housing.
A valve hole connected to the passage and opening at the tip of the valve housing.
A gas fuel injection valve which is formed and has an outer peripheral surface of a movable body provided with a valve body capable of opening and closing a valve hole at an end thereof, which is slidably fitted to an inner peripheral surface of a valve housing. did
Axial sliding on the inner peripheral surface of the valve housing and the inner peripheral surface
The magnetic fluid held by the permanent magnet embedded in the valve housing is filled between the movable body and the outer peripheral surface of the movable body fitted in the valve housing, so that the movable body is lubricated by the magnetic fluid. The gas fuel can be injected without significantly changing the structure of the conventionally used liquid fuel injection valve by reducing wear and preventing malfunction.

According to a second feature of the present invention, the above
In the body fuel injection valve, the valve housing made of magnetic material
Can be fitted to the inner peripheral surface so that it can slide in the axial direction.
Magnetic fluid held by a permanent magnet embedded in the valve housing is filled between the magnetic fluid and the outer peripheral surface of the moving body at positions spaced in the moving direction of the movable body, and lubricating oil is sealed between the magnetic fluids. Therefore, lubricating the moving body with lubricating oil reduces wear of the moving body to prevent malfunction, and improves responsiveness by reducing sliding resistance at the lubricating oil seal.
It is possible to inject gaseous fuel without significantly changing the structure of a conventionally used liquid fuel injection valve.

According to the above features, the permanent magnet is embedded in the valve housing without being exposed on the inner peripheral surface of the valve housing, which is a sliding guide surface for the movable body.
The sliding guide surface (the inner peripheral surface of the valve housing) can be machined accurately without being affected by the permanent magnet, and the movable body can slide smoothly along the machined surface.
In addition, there is no need to ensure a high sealing property between the sliding guide surface and the permanent magnet, which can greatly contribute to improving the workability of the sliding guide surface as a whole and reducing the processing cost. Even if the permanent magnet is buried in the valve housing, it can be easily brought close to the magnetic fluid by arranging it near the inner peripheral surface of the valve housing. Can be. Further, since there is no fear that the permanent magnet or the magnet mounting means protrudes into the internal space of the valve housing, the size of the valve housing itself, which has a limited space at the tip of the fuel injection valve, can be achieved. In addition, the permanent magnet is a valve housing
Buried through the opening on the outer peripheral surface of the
Blind hole-shaped recess to be formed corresponding to the installation site is relatively shallow
The recess on the outer surface of the valve housing.
Not only can it be processed relatively easily, but also
Stone embedding work is relatively easy from outside the housing
To reduce manufacturing costs and improve productivity.
Can be given.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of a gaseous fuel injection valve according to a first embodiment.

FIG. 2 is an enlarged view of a part of FIG.

FIG. 3 is a sectional view of a main part of a second embodiment.

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a sectional view of a main part of a third embodiment.

[Explanation of symbols]

5: valve housing 9 ... valve hole 11 ... valve body 16, 16 ', 17 ... Permanent magnet 22 _1, 22 _2, 22 _3, 22 ₄ ... movable member 41 ... lubricity oil

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-139959 (JP, A) JP-A-3-260415 (JP, A) JP-A-57-15152 (JP, A) 53552 (JP, U) Hikaru 4-14865 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02M 21/02 F16J 15/43 F02M 61/16

Claims (2)

(57) [Claims] The valve housing (5) is provided with the valve housing (5).
And a valve housing connected to the gaseous fuel passage in the valve housing.
(5) tip to form a valve hole (9) for opening, the outer periphery of the valve hole movable body having a front end an openable valve (11) (9) (22 _1, 22 _2, 22 ₄₎ The surface is the valve housing
(5) Gas fuel fitted to the inner peripheral surface so as to be slidable in the axial direction
In the injection valve, the valve housing (5) is made of a magnetic material, and the valve housing (5) is made of a magnetic material.
Ring (5) and the movable member (22 _1, 22 _2, 22 ₄₎ between
, The valve housing (5) to the fixing of the permanent magnets (16,
17, 16 ') magnetic fluid held (15) is filled with, the permanent magnets (16,17,16') is a valve housing
(5) through the opening in the outer surface of the housing (5)
The gas fuel injection valve is buried without being exposed on the inner peripheral surface . 2. The valve housing (5) is provided with its valve housing.
And a valve housing connected to the gaseous fuel passage in the valve housing.
(5) tip to form a valve hole which is open (9) of the outer peripheral surface of the valve hole movable body having a front end an openable valve (11) (9) (22 _4), the valve housing ( In the gas fuel injection valve fitted to the inner peripheral surface of 5) so as to be slidable in the axial direction , the valve housing (5) is made of a magnetic material, and the valve housing is provided.
Ring (5) and the movable member (22 ₄₎ between the movement direction of the valve housing magnetic fluid held by the fixed permanent magnet (5) (16, 17) (15) the movable body (22 ₄₎ in Jun Namerayu (41) is sealed Rutotomoni filled in spaced locations on its magnetic fluid (15) between each other, the permanent magnets (16, 17) is a valve housing (5),
Through the opening in the outer peripheral surface of the housing (5)
Characterized by being buried without being exposed on the peripheral surface ,
Gas fuel injection valve.