JP2559599Y2 - Valve lifter for internal combustion engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve lifter for an internal combustion engine having a structure in which a face disk and a skirt, which are separately provided, are integrally combined.

[0002]

2. Description of the Related Art FIG. 12 shows a conventional valve lifter for an internal combustion engine disclosed in JP-A-62-58003. This valve lifter is a sliding contact portion with an eccentric cam, a disk-shaped face disk portion 2 which is a contact portion with an upper end portion of a valve stem, and a cylindrical skirt which is a sliding contact portion with an inner peripheral surface of a cylinder bore. The skirt portion 3 and the face disk portion 2 have a structure in which a part 3a of the skirt portion 3 is plastically deformed (caulked) by, for example, a jig 4 and is integrated. The material of the two parts 2 and 3 is made as light and hard as possible in consideration of wear resistance, slidability and reduction of inertia weight (for example, the face disk part 2 is made of an iron alloy, Is a Hi-Si aluminum alloy).

[0003]

However, the Hi-Si aluminum alloy has high strength and excellent abrasion resistance, but has poor plastic deformability. When subjected to plastic deformation, residual strain and cracks are liable to occur. There is a limit to the depth of the projections and depressions due to the plastic working of the skirt portion 2 and the skirt portion 3, and sufficient bonding strength cannot be secured. That is, in order to avoid residual strain and cracks, the amount of deformation due to caulking between the concave and convex protruding portions of the face disk portion 2 and the skirt portion 3 must be reduced. It is desirable to increase the amount of deformation.

[0004] Thus, good plastic working and high strength are contradictory.
As long as the face disk portion and the skirt portion are joined by plastic working, there is a problem that an ideal high-strength (and lightweight) valve lifter suitable for the intended use cannot be realized. Further, the fitting portion between the face disk portion 2 and the skirt portion 3 is inevitably swelled and deformed outward by caulking. For this reason, even if the outer diameter of the skirt portion 3 has been subjected to the finishing process in advance, there is a problem that the finishing process must be performed again since the outer diameter is deformed when the two portions 2 and 3 are joined together.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the purpose of providing both the face disk portion and the skirt portion with no plastic working at all, that is,
It is an object of the present invention to provide a valve lifter for an internal combustion engine that can be integrated and integrated without deforming dimensions due to deformation, and that has high integration and integration strength.

[0006]

According to a first aspect of the present invention, there is provided a valve lifter for an internal combustion engine, wherein a disk-shaped face disk portion is integrally connected to an opening of a cylindrical skirt portion. In the valve lifter for use, an inner flange portion is provided around the opening of the skirt portion, and a protruding portion is formed in the face disk portion so as to fit in the axial direction with the inner flange portion. And a part of the ring-shaped fastening member disposed on the outer periphery of the protruding portion is plastically deformed to fill the recessed portion on the protruding portion side, and the skirt is formed by the ring-shaped fastening member and the peripheral edge of the face disk. The inner flange portion of the portion was pinched and fixed in the axial direction.

[0007] The fastening member is made of a material having greater extensibility than both the face disk portion and the skirt portion. Further, the ring-shaped fastening member is made of a thermoplastic resin, and a part thereof is plastically deformed by heating to fill the recess. 5. The valve lifter for an internal combustion engine according to claim 4, wherein a disc-shaped face disk portion is integrally connected to an opening of the cylindrical skirt portion, and an inner flange portion is formed on the opening of the skirt portion. The face disk portion is formed with a protrusion that fits in the axial direction with the inner flange portion, and a circumferentially extending ridge is formed on the outer periphery of the protrusion, and a ridge on the protrusion side is formed. A fastening member partially filled and engaged is molded and integrated with the outer periphery of the protruding portion, and the inner flange portion of the skirt is axially held and fixed by the fastening member and the peripheral edge of the face disk.

In the valve lifter for an internal combustion engine according to the fifth aspect, a face disk portion is integrally connected to an opening of the cylindrical skirt portion, and a replaceable outer shim is provided on the face disk portion. In the valve lifter for use, an inner flange portion is provided around the opening of the skirt portion, and a protruding portion is formed in the face disk portion so as to fit in the axial direction with the inner flange portion. Along with forming a concave streak, a part of the ring-shaped fastening member arranged on the outer periphery of the protruding portion is plastically deformed and filled into the recess on the protruding portion side, and by the ring-shaped fastening member and the peripheral edge of the face disk, The inner flange portion of the skirt portion is pinched and fixed in the axial direction.

[0009] The fastening member is made of a material having a higher extensibility than both the face disk portion and the skirt portion. Further, the ring-shaped fastening member is made of a thermoplastic resin, and a part of the ring-shaped fastening member is plastically deformed by heating to fill the concave streak. In the valve lifter for an internal combustion engine according to claim 8, a face disk portion is integrally connected to an opening of the cylindrical skirt portion, and a replaceable outer shim is provided on the face disk portion. In the opening of the skirt portion, an inner flange portion is provided around the opening portion, and a projection portion is formed on the face disk portion so as to be fitted in the inner flange portion in the axial direction. In addition to forming the ridge, a fastening member partially filled and engaged with the concave ridge on the protruding portion is molded and integrated on the outer periphery of the protruding portion, and the inner flange portion of the skirt portion is pivoted by the fastening member and the peripheral edge of the face disk. It is designed to be clamped and fixed in the direction.

[0010]

The ring-shaped fastening member (not limited to the ring shape in the fourth aspect), which is plastically deformed and integrated with the protrusion of the face disk fitted in the skirt portion in the axial direction, and the peripheral edge of the face disk are formed by the skirt. Since the inner flange portion of the portion is sandwiched and fixed in the axial direction, the skirt portion and the face disk portion are prevented from coming off in the axial direction, and the integrated connection is ensured.

The fastening member is partially plastically deformed radially inward in the first to third (5 to 7) and is filled in the concave streak of the projection of the flange portion. Since the portion is filled in the concave portion of the protrusion by insert molding, the joint portion, especially the skirt portion, is not deformed at all, and therefore, the joint portion does not bulge radially outward unlike the conventional structure. According to the fifth to eighth aspects, the outer shim is provided on the face disk portion, so that the gap between the valve lifter and the cam can be easily adjusted.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a valve lifter for an internal combustion engine.
FIG. 2 is an explanatory diagram for explaining how the skirt portion and the face disk portion are joined.

In these figures, a valve lifter 10 for an internal combustion engine has a disc-shaped face disk portion (hereinafter abbreviated as FD portion) at one opening of a cylindrical skirt portion (hereinafter abbreviated as SK portion) 30. 20 are combined and integrated to form a substantially cap shape as a whole. The integration of the FD unit 20 and the SK unit 30, which is a main part of the present invention, is performed as follows. That is, a cylindrical lower protruding portion 21 is protruded from the lower surface side of the FD portion 20, and the protruding portion 21 and the inner flange portion 31 provided around the inside of the opening of the SK portion 30 are pivoted. Direction (L direction). Reference numerals 21a and 31a are fitting surfaces on the protruding portion 21 side and the inner flange portion 31 side. A concave streak 22 is provided around the outer periphery of the protruding portion 21 protruding below the inner flange portion 31. The FD section 20 and the SK section 30 are separated from the outer periphery of the protruding section 21 by these members (the FD section 20, the Sk section 30).
The ring-shaped fastening member 40 made of a material having higher extensibility (plastic workability, stretchability) than the constituent material of the K portion 30)
Is disposed, the ring-shaped fastening member 40 is plastically deformed inward in the radial direction, a part of the ring-shaped fastening member 40 is filled in the concave streak 22, and the inner flange portion 31 is
0 and the FD peripheral edge portion 23 for pinching and fixing in the axial direction.
It has a structure in which the flange portion 20 and the skirt portion 30 are combined and integrated.

The method of filling the ring-shaped fastening member 40 into the concave streaks 22 is performed, for example, as follows. That is, FD
The SK portion 30 is fitted to the protruding portion 21 with the protruding portion 21 of the portion 20 facing upward, and a ring-shaped fastening member 40A (shown by a solid line in FIG. 2) having a rectangular cross section is arranged on the outer periphery of the protruding portion 21. Set up. Then, the fastening member 40A is pressed by the cylindrical jig 70 having the ring-shaped inclined surface 72 corresponding to the outer peripheral edge of the ring-shaped fastening member 40A. Then, the ring-shaped fastening member 40 is pressed by the inclined surface 72 of the jig 70 toward the concave streak 22, and when the pressing force exceeds a certain value, the ring-shaped fastening member 40 is plastically deformed and partially fills the concave streak 22 (see the phantom line in FIG. 2). FD unit 20
And the SK unit 30 are combined and integrated.

As shown in FIG. 3, a pressure receiving surface 32 for the fastening member 40, which is flush with the inner flange portion 31, is formed on the projecting portion 21 on the FD portion 20 side. Alternatively, the load acting on the inner flange portion 31 may be reduced. Thus, in the present embodiment, F
Both parts 20, 30 are combined and integrated by plastic deformation of a ring-shaped fastening member 40A, which is a separate member from D part 20 and SK part 30. Therefore, the FD portion 20 and the SK portion 30 can be joined and integrated without directly performing any plastic working on both portions 20 and 30. Even if the FD portion 20 and the SK portion 30 are made of a material that cannot be plastically worked, can do. FD section 2
Examples of materials used for the 0 and SK portions 30 include metals such as iron, aluminum, and titanium, synthetic resins such as reinforced plastics, and ceramics that cannot be plastically processed.
It is also possible to use materials that meet the conditions required for the FD section 20 and the SK section 30 in any combination. On the other hand, as a material used for the ring-shaped fastening member 40, a material suitable for plastic working, for example, mild steel, copper, zinc, aluminum, or an alloy thereof is used. Further, the ring-shaped fastening member 40 may be made of a thermoplastic resin, and the plastic working may be performed while heating.
Further, a thermoplastic reinforced resin in which glass fiber, carbon fiber or the like is mixed and reinforced may be used.

FIG. 4 shows a second embodiment of the present invention, and is a longitudinal sectional view of a valve lifter. This second
In this embodiment, as shown in FIG. 4, a ring-shaped metal sheet material 50 is interposed between the ring-shaped fastening member 40 and the inner flange portion 31. For this reason, when plastically deforming the ring-shaped fastening member 40 using a jig to join and integrate the FD portion 20 and the SK portion 30, the ring-shaped fastening member 40 does not directly contact the surface of the inner flange portion 31, Since the force acting on the inner flange portion 31 from the fastening member 40 is dispersed (equalized) by the sheet material 50, the force is not partially concentrated on the inner flange portion 31 and the acting force is not biased.
This is effective for suppressing the occurrence of cracks on the surface of the inner flange portion 31. The outer diameter D of the sheet member 50 is equal to the outer diameter d of the fastening member 40.
The surface pressure (stress) acting on the inner flange portion 31 during caulking or during operation of the internal combustion engine is reduced, which is effective for suppressing cracks and deformation or improving the retaining property. .

The ring-shaped fastening member 40A is made of a thermoplastic synthetic resin. After the fastening member 40A is disposed on the outer periphery of the protruding portion 21, the fastening member 40A is heated by the heated jig 70.
, And the fastening member 40A may be plastically deformed radially inward by heat to partially fill the concave streak 22. FIG. 5 shows another embodiment of the present invention, in which a ring-shaped fastening member 40B connecting the FD portion 20 and the SK portion 30 is made of a synthetic resin, and the portion between the projecting portion 21 and the SK portion 30 is formed by injection molding. It is molded into one. That is, the FD portion 20 and the SK portion 30 are fitted in the axial direction, the annular mold 42 is engaged and held between the SK portion 30 and the projecting portion 21, and the SK portion 30, the projecting portion 21 and the mold 42 are held. To form a ring-shaped hollow portion H. A resin is injected into the hollow portion H through a passage 43 provided in the mold 42 to be solidified and solidified.
Is to be removed. Instead of injection molding, a resin in a molten state may be supplied to the hollow portion H and press-molded by the mold 42.

In the embodiment shown in FIG. 5, the projecting portion 21 is provided with a recess 22 around which the inside of the ring-shaped fastening member 40B is filled over the entire circumference. However, a plurality of concave streaks 22 are formed in the circumferential direction, and the synthetic resin fastening members 40
A structure in which a part of C is filled may be used. That is, as shown in FIGS. 6 and 7, a plurality of synthetic resin fastening members 4 are provided between the FD portion side protruding portion 21 and the SK portion 30 by injection molding.
The structure is such that 0C is loaded. Reference numeral 38 denotes a recess formed in the SK portion 30 facing the recess 22 of the projecting portion 21. Since the recess 38 also has a function of preventing the fastening member 40C from coming off, the FD portion 20 and the SK portion 30 The bonding strength between them is high. The mold 42 has a partition wall 44 that is engaged between the protruding portion 21 and the SK portion 30 to separate and separate the hollow portion into which the resin is injected in the circumferential direction.

FIG. 8 shows still another embodiment of the present invention, and corresponds to FIG. In this embodiment, SK
An inner flange portion 31 is formed at a position one step lower than the opening end of the portion 30A, and the FD portion 20A is formed on the inner flange portion 31.
The FD portion 20A and the SK portion 30A are integrally joined by plastically deforming the ring-shaped fastening member 40 made of a highly extensible material as in the first embodiment. Has been A shim housing chamber S is formed on the FD section 20A and is surrounded by an opening edge of the SK section 30A. The outer shim 60 acting as a sliding contact section with an eccentric cam (not shown) in the shim housing chamber S.
Is housed.

In the various embodiments shown in FIGS. 1 to 7, the FD portion 20 integrated with the SK portion 30 functions as a sliding contact portion of the cam, so that the gap between the cam and the valve lifter is adjusted. In general, it is necessary to provide an inner shim inside the FD portion 20, and replacement of the inner shim is troublesome. However, in this embodiment, a shim accommodating portion S is formed on the FD portion 20 </ b> A, and the outer shim 60 is provided here. Because it contains
It is easy to replace the outer shim, and it is very easy to adjust the gap between the cam and the valve lifter.

FIG. 9 is an improvement of the embodiment shown in FIG. 4, in which a shim accommodation chamber S is formed on the FD portion 20A, and an outer shim 60 is accommodated therein. The other parts are the same as those in the embodiment shown in FIGS. 4 and 8 described above, and the description thereof will be omitted by retaining the same reference numerals. FIGS. 10 and 11 are modifications of the embodiment shown in FIGS. 5 and 6, respectively, and differ from the embodiments shown in FIGS. 5, 6 and 8 in that a shim accommodation chamber S is formed on the FD portion 20A. The other components are the same as those of the embodiment shown in FIGS. 5, 6, and 8, and the description thereof will be omitted by retaining the same reference numerals.

[0022]

As is clear from the above description, according to the valve lifter for an internal combustion engine according to the present invention, the face disk portion and the skirt portion are combined and integrated without any plastic working on both. There is no risk of distortion or cracks occurring in the face disk portion and the skirt portion, and the durability is high.

In particular, in claim 2 (6), since the extensibility of the fastening member is greater than that of the skirt portion or the face disk portion,
Both the skirt and the face disk can be combined and integrated without deforming, and the dimensions are not deviated by the combined integration. Finishing of the outer surface is not required.

According to the valve lifter of the present invention, the depth at which the fastening member is plastically deformed and the concave portion of the projecting portion of the face disk portion to be filled is formed within the range in which plastic deformation is possible as in the prior art. There is no restriction within, and even if the face disk portion and the skirt portion are deformed in an environment exposed to severe vibration or high temperature, the face disk portion and the skirt portion can be made deeper than the deformation amount. That is, even in an environment exposed to severe vibration or high temperature, there is no possibility that the fastening member will fall out of the concave streak.Therefore, there is little possibility that the integrated connection between the face disk portion and the skirt portion will come off, and the fastening strength is higher than the conventional structure. It can be said that.

Further, the material of the face disk portion and the skirt portion can be selected purely from the purpose of use irrespective of whether or not plastic working is possible. It is also possible to use new materials such as. Therefore, an ideal valve lifter having a small inertial weight and a high resistance to wear can be manufactured.

According to the fifth to eighth aspects, since the outer shim can be easily replaced, the operation of adjusting the gap between the cam and the valve lifter is simple.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a valve lifter for an internal combustion engine according to a first embodiment of the present invention;

FIG. 2 is an explanatory view of assembling the valve lifter.

FIG. 3 is a sectional view of a main part of a modified example of the valve lifter of the first embodiment.

FIG. 4 is a longitudinal sectional view of a valve lifter for an internal combustion engine according to a second embodiment of the present invention;

FIG. 5 is a longitudinal sectional view of a valve lifter for an internal combustion engine according to another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a main part of a valve lifter according to still another embodiment of the present invention.

FIG. 7 is a horizontal sectional view of the valve lifter.

FIG. 8 is a longitudinal sectional view of a main part according to a further embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a main part according to a further embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a main part according to a further embodiment of the present invention.

FIG. 11 is a vertical sectional view of a main part according to a further embodiment of the present invention.

FIG. 12 is a longitudinal sectional view of a conventional valve lifter for an internal combustion engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Valve lifter for internal combustion engines 20, 20A Face disk part 21, 21A Projection part of face disk part 22 Concave ridge of projection part 23 Face disk peripheral part 30, 30A Skirt part 31 Inner flange part of skirt part 40, 40A, 40B Ring Shaped fastening member 40C Fastening member 60 Outer shim S Shim storage chamber

Claims (8)

(57) [Scope of request for utility model registration] 1. A valve lifter for an internal combustion engine in which a disc-shaped face disk portion is joined and integrated with an opening of a cylindrical skirt portion, an inner flange portion is provided around the opening of the skirt portion,
A projecting portion is formed on the face disk portion so as to fit in the axial direction with the inner flange portion. A circumferentially extending recess is formed on the outer periphery of the projecting portion, and a ring-shaped fastening provided on the outer periphery of the projecting portion. A part of the member is plastically deformed and filled in the concave portion on the protruding portion side, and the inner flange portion of the skirt portion is sandwiched and fixed in the axial direction by the ring-shaped fastening member and the peripheral edge portion of the face disk. Valve lifter for internal combustion engine. 2. The valve lifter for an internal combustion machine according to claim 1, wherein said ring-shaped fastening member is made of a material having a greater extensibility than both of the face disk portion and the skirt portion. 3. The valve lifter for an internal combustion engine according to claim 1, wherein said ring-shaped fastening member is made of a thermoplastic resin, and is plastically deformed by heating and partially filled in the concave streak. 4. A valve lifter for an internal combustion engine in which a disc-shaped face disk portion is joined to and integrated with an opening of a cylindrical skirt portion, wherein an inner flange portion is provided around the opening of the skirt portion.
A protrusion is formed on the face disk portion so as to fit in the axial direction with the inner flange portion. A circumferentially extending recess is formed on the outer periphery of the protrusion, and a part of the protrusion is filled in the outer periphery. A valve lifter for an internal combustion engine, wherein the engaged fastening member is molded and integrated, and the inner flange portion of the skirt is axially held and fixed by the fastening member and the peripheral edge of the face disk. 5. A valve lifter for an internal combustion engine, wherein a face disk portion is integrally connected to an opening of a cylindrical skirt portion and a replaceable outer shim is provided on the face disk portion. Has an inner flange around
A projecting portion is formed on the face disk portion so as to fit in the axial direction with the inner flange portion. A circumferentially extending recess is formed on the outer periphery of the projecting portion, and a ring-shaped fastening provided on the outer periphery of the projecting portion. A part of the member is plastically deformed and filled in the concave portion on the protruding portion side, and the inner flange portion of the skirt portion is sandwiched and fixed in the axial direction by the ring-shaped fastening member and the peripheral edge portion of the face disk. Valve lifter for internal combustion engine. 6. The valve lifter for an internal combustion machine according to claim 5, wherein the ring-shaped fastening member is made of a material having a greater extensibility than both the face disk portion and the skirt portion. 7. The valve lifter for an internal combustion engine according to claim 5, wherein said ring-shaped fastening member is made of a thermoplastic resin, and is partially deformed by heat plastic deformation to fill a concave streak. 8. A valve lifter for an internal combustion engine, wherein a face disk portion is joined and integrated with an opening of a cylindrical skirt portion and a replaceable outer shim is provided on the face disk portion. Has an inner flange around
A protrusion is formed on the face disk portion so as to fit in the axial direction with the inner flange portion. A circumferentially extending recess is formed on the outer periphery of the protrusion, and a part of the protrusion is filled in the outer periphery. A valve lifter for an internal combustion engine, wherein the engaged fastening member is molded and integrated, and the inner flange portion of the skirt is axially held and fixed by the fastening member and the peripheral edge of the face disk.