JPH0512605U - Valve lifter for internal combustion engine - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a valve lifter for an internal combustion engine that can integrate and integrate the face disk portion and the skirt portion without any plastic working. In a valve lifter for an internal combustion engine in which a disc-shaped face disk portion 20 is integrally connected to an opening portion of a cylindrical skirt portion 30, an inner flange portion 31 is provided around the opening portion of the skirt portion 30, and the face disk portion 20 is provided. On the side, a projecting portion 21 that axially fits with the inner flange portion 31 is formed, a circumferentially extending recess 22 is formed on the outer periphery of the projecting portion 21, and a ring shape is provided on the outer periphery of the projecting portion 21. A part of the fastening member 40 is plastically deformed to fill the recessed line 22 on the side of the protrusion 21 (or the fastening member 40 is integrally molded on the outer periphery of the protrusion to partially fill the recessed line 22). The inner flange portion 31 of the skirt portion is sandwiched and fixed in the axial direction by the face disk peripheral portion 23.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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 separate bodies, are combined and integrated.

[0002]

[Prior 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 part with an eccentric cam, and a cylindrical face disk part 2 that is a contact part with the upper end of the valve stem, and a cylindrical contact part that is a sliding contact part with the inner peripheral surface of the 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 to be integrated with each other. .. In consideration of wear resistance, slidability, and reduction of inertial weight, the materials of both parts 2 and 3 are as lightweight and as hard as possible (for example, face disk part 2 is an iron alloy, skirt part 3 Is a Hi-Si aluminum alloy).

[0003]

[Problems to be solved by the invention]

 However, while the Hi-Si aluminum alloy has high strength and excellent wear resistance, it has poor plastic deformability and is susceptible to residual strain and cracks when subjected to plastic deformation. Therefore, due to the plastic working of the face disk 2 and the skirt 3, There is a limit to the depth of the projections and depressions, and it is not possible to secure sufficient bonding strength. That is, in order to avoid residual strain and cracks, the amount of deformation due to caulking between the concave and convex projections of the face disk portion 2 and the skirt portion 3 must be reduced, while in order to increase the bonding strength, the caulking is required. It is desirable to increase the deformation amount due to.

As described above, good plastic working and high strength are contradictory, so long as the structure is such that the face disk portion and the skirt portion are joined by plastic working, There is a problem that it is not possible to realize a valve lifter that is ideal and has high strength (and light weight). Further, at the fitting portion of the face disk portion 2 and the skirt portion 3, swelling and deformation are inevitably caused by caulking. For this reason, even if the outer diameter of the skirt portion 3 is subjected to finish machining in advance, when the two portions 2 and 3 are joined, the skirt portion 3 is deformed to the side where the diameter is increased, so that there is a problem that the finishing process must be performed again.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to prevent the face disk portion and the skirt portion from being deformed due to deformation without any plastic working. An object of the present invention is to provide a valve lifter for an internal combustion engine, which can be integrated and integrated without any difficulty, and which has high strength.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the valve lifter for an internal combustion engine according to claim 1, 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. An inner flange portion is provided around the opening of the portion, a projecting portion axially fitted to the inner flange portion is formed on the face disk portion, and a recessed line extending in the circumferential direction is formed on the outer circumference of the projecting portion. At the same time, a part of the ring-shaped fastening member arranged on the outer periphery of the projecting portion is plastically deformed to fill the concave line on the projecting portion side, and the ring-shaped fastening member and the peripheral edge of the face disk secure the inner flange portion of the skirt portion. It is designed to be clamped and fixed in the axial direction.

Further, the fastening member is made of a material having greater ductility 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 recess. The valve lifter for an internal combustion engine according to claim 4, wherein a disk-shaped face disk portion is integrally joined to an opening portion of a cylindrical skirt portion, wherein an inner flange portion is provided in the opening portion of the skirt portion. The face disk portion is formed with a protruding portion that axially fits with the inner flange portion, and a circumferentially extending groove is formed on the outer periphery of the protruding portion. A fastening member, which is partially filled and engaged, is formed integrally with the outer periphery of the protruding portion, and the inner flange portion of the skirt portion is axially clamped and fixed by the fastening member and the peripheral portion of the face disk.

In a valve lifter for an internal combustion engine according to a fifth aspect, an internal combustion engine in which a face disk portion is combined and integrated with an opening of a cylindrical skirt portion and a replaceable outer shim is provided on the face disk portion. In an engine valve lifter, an inner flange portion is provided around the opening of the skirt portion, and a protrusion portion that axially fits with the inner flange portion is formed on the face disk portion. Direction is formed, and a part of the ring-shaped fastening member arranged on the outer periphery of the protrusion is plastically deformed to fill the recess on the protrusion side, and the ring-shaped fastening member and the peripheral edge of the face disk are formed. The inner flange of the skirt is clamped and fixed in the axial direction.

Further, the fastening member is made of a material having greater ductility 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 so as to fill the groove. In the valve lifter for an internal combustion engine according to claim 8, 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. In the footer, an inner flange portion is provided around the opening of the skirt portion, a projecting portion axially fitted to the inner flange portion is formed on the face disc portion, and the projecting portion extends in the circumferential direction. In addition to forming the ridge, a fastening member that partially fills and engages the ridge on the side of the protrusion is molded and integrated on the outer periphery of the protrusion, and by the fastening member and the peripheral portion of the face disk, the inner flange of the skirt is formed. The part is clamped and fixed in the axial direction.

[0010]

[Action]

 The ring-shaped fastening member (not limited to the ring shape in claim 4) that is plastically deformed and integrated into the projecting portion of the face disk that is axially fitted to the skirt portion, and the face disk peripheral portion are the skirt portion. Since the inner flange portion of the is fixed by being sandwiched in the axial direction, the skirt portion and the face disk portion are prevented from coming off in the axial direction, and the connection and integration are secured.

According to claims 1 to 3 (5 to 7), the fastening member is partially plastically deformed inward in the radial direction so as to be filled in the groove of the protruding portion of the flange portion. Since the portion is filled in the concave line of the protrusion by insert molding, the joint portion, particularly the skirt portion, is not deformed at all, so that the joint portion does not bulge outward in the radial direction unlike the conventional structure. Further, in claims 5 to 8, since the outer shim is provided on the face disk portion, it is easy to adjust the gap between the valve lifter and the cam.

[0012]

【Example】

 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 vertical cross-sectional view of a valve lifter for an internal combustion engine, and FIG. 2 illustrates how a skirt portion and a face disk portion are joined together. FIG.

In these figures, a valve lifter 10 for an internal combustion engine has a disk-shaped face disk portion (hereinafter, abbreviated as FD portion) at one opening of a cylindrical skirt portion (hereinafter abbreviated as SK portion) 30. 20 is connected and integrated, and the whole is formed into a substantially cap shape. The FD section 20 and the SK section 30 which are the main parts of the present invention are combined and integrated as follows. That is, on the lower surface side of the FD portion 20, a cylindrical lower protruding portion 21 is provided in a protruding manner, and the protruding portion 21 and the inner flange portion 31 provided around the inside of the opening of the SK portion 30 are axial. It is fitted in the direction (L direction). Reference numerals 21a and 31a are fitting surfaces on the protruding portion 21 side and the inner flange portion 31 side. Then, a concave line 22 is provided around the outer periphery of the projecting portion 21 projecting downward from the inner flange portion 31. The outer periphery of the protruding portion 21 is a member separate from the FD portion 20 and the SK portion 30 and has a high malleability (plastic workability and stretchability) as compared with the constituent materials of these (FD portion 20, SK portion 30). A ring-shaped fastening member 40 made of a material is provided, and the ring-shaped fastening member 40 is plastically deformed inward in the radial direction so that a part of the ring-shaped fastening member 40 is filled in the recess 22 and the inner flange portion 31 is formed. The ring-shaped fastening member 40 and the FD peripheral portion 23 are sandwiched and fixed in the axial direction, so that the flange portion 20 and the skirt portion 30 are combined and integrated.

A method for filling the ring-shaped fastening member 40 into the recessed strip 22 is as follows, for example. That is, the SK portion 30 is fitted to the protruding portion 21 with the protruding portion 21 of the FD portion 20 facing upward, and the ring-shaped fastening member 40A having a rectangular cross section (shown by the solid line in FIG. 2) is attached to the protruding portion 21. It is arranged on the outer circumference. 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 portion of the ring-shaped fastening member 40A. Then, the slanted surface 72 of the jig 70 presses the ring-shaped fastening member 40 toward the recess 22. When the pressing force exceeds a certain value, the ring-shaped fastening member 40 is plastically deformed to partially fill the recess 22 (see the phantom line in FIG. 2). ), The FD section 20 and the SK section 30 are combined and integrated.

As shown in FIG. 3, a pressure receiving surface 32 for the fastening member 40 that is flush with the inner flange portion 31 is formed on the protruding portion 21 on the FD portion 20 side, and when the fastening member 40 is caulked. Alternatively, the load acting on the inner flange portion 31 may be reduced. As described above, in this embodiment, the FD portion 20 and the SK portion 30 are joined together by plastic deformation of the ring-shaped fastening member 40A that is a separate member. For this reason, the FD portion 20 and the SK portion 30 can be combined and integrated without directly performing plastic working on the both portions 20 and 30, and the FD portion 20 and the SK portion 30 cannot be plastically worked. Can also be combined. Examples of materials used for the FD portion 20 and the SK portion 30 include metals such as iron, aluminum, and titanium, synthetic resins such as reinforced plastic, and ceramics that cannot be plastically processed. It is also possible to freely combine and use materials that meet the respective requirements of the part 30. 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 may be plastically processed while being heated. Further, a thermoplastic reinforced resin in which glass fibers, carbon fibers or the like are mixed and reinforced may be used. ..

FIG. 4 shows a second embodiment of the present invention and is a vertical sectional view of a valve lifter. In the second 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. Therefore, when the ring-shaped fastening member 40 is plastically deformed using a jig to integrally combine 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, The force acting on the inner flange portion 31 from the fastening member 40 is dispersed (uniformized) by the sheet material 50, so that the force is not partially concentrated on the inner flange portion 31 or the acting force is not biased. Therefore, it is effective for suppressing the occurrence of cracks on the surface of the inner flange portion 31. Further, the outer diameter D of the sheet material 50 is made larger than the outer diameter d of the fastening member 40, which reduces the surface pressure (stress) acting on the inner flange portion 31 during crimping or during operation of the internal combustion engine. Therefore, it is effective in suppressing cracks and deformation or improving the retaining property.

Further, the ring-shaped fastening member 40A is made of a thermoplastic synthetic resin, and after the fastening member 40A is arranged on the outer periphery of the projecting portion 21, the fastening member 40A is pressed by the heated jig 70, so that the fastening member 40A is It is also possible to plastically deform inward in the radial direction and partially fill the recess 22. FIG. 5 shows another embodiment of the present invention, in which the ring-shaped fastening member 40B connecting the FD portion 20 and the SK portion 30 is made of synthetic resin, and is formed between the protruding portion 21 and the SK portion 30 by injection molding. It is molded and integrated into. That is, the FD portion 20 and the SK portion 30 are fitted in the axial direction, the annular die 42 is engaged and held between the SK portion 30 and the protruding portion 21, and the SK portion 30, the protruding portion 21, and the die 42. A ring-shaped hollow portion H is formed by and the hollow portion H is injected and filled with resin through a passage 43 provided in the die 42 to be solidified, and the die 22 is removed. Further, instead of injection molding, a molten resin may be supplied to the hollow portion H and press-molded by the mold 42.

In the embodiment shown in FIG. 5 described above, 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, there may be a structure in which a plurality of recessed ridges 22 are formed in the circumferential direction, and the recessed ridges 22 are partially filled with the synthetic resin fastening member 40C. That is, as shown in FIGS. 6 and 7, a plurality of synthetic resin fastening members 40C are loaded between the FD portion side protrusion 21 and the SK portion 30 by injection molding. Reference numeral 38 is a groove formed on the SK portion 30 so as to face the groove 22 of the protruding portion 21. Since the groove 38 also has a function of preventing the fastening member 40C from coming off, the FD portion 20 and the SK portion 30. The bond strength between them is high. The mold 42 is formed with a partition wall 44 that engages between the projecting portion 21 and the SK portion 30 to 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, the inner flange portion 31 is formed at a position deeper than the opening end of the SK portion 30A, and the inner flange portion 31 is engaged with the protruding portion 21A of the FD portion 20A. Similarly to the above, the FD portion 20A and the SK portion 30A are integrally combined by plastically deforming the ring-shaped fastening member 40 made of a material having high ductility. A shim accommodating chamber S is formed on the FD portion 20A and is surrounded by the peripheral edge of the opening of the SK portion 30A. The outer shim 60 acts as a sliding contact portion with an eccentric cam (not shown) in the shim accommodating chamber S. Is housed.

In the various embodiments shown in FIGS. 1 to 7 described above, since the FD portion 20 integrated with the SK portion 30 acts as a sliding contact portion of the cam, the gap adjustment between the cam and the valve lifter is adjusted. In general, it is necessary to provide an inner shim on the inside of the FD portion 20, which makes it difficult to replace the inner shim. The outer shim can be easily replaced and the clearance between the cam and valve lifter can be adjusted very easily.

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

[0022]

[Effect of the device]

 As is clear from the above description, according to the valve lifter for an internal combustion engine of the present invention, the face disk portion and the skirt portion are integrally connected without any plastic working, so that the face disk portion and the skirt portion are integrated. Highly durable with no risk of distortion or cracks in the skirt.

In particular, in claim 2 (6), since the extensibility of the fastening member is larger than that of the skirt portion and the face disc portion, the skirt portion and the face disc portion can be combined and integrated without deformation, and the combined and integrated portions can be formed. As a result, the dimensions do not change, and by using the skirt that has been finished on the outer surface beforehand, it is not necessary to finish the outer surface after integrating it as a valve lifter.

Further, according to the valve lifter of the present invention, the depth of forming the groove of the protruding portion of the face disk portion that is plastically deformed and filled with the fastening member is within a plastically deformable range as in the prior art. Even if the face disk and skirt are deformed under the environment of severe vibration or high temperature, it can be deepened more than the amount of deformation. That is, even under an environment exposed to severe vibration or high temperature, there is no concern that the fastening member will fall out of the recessed line, so there is less possibility that the face disk portion and the skirt portion will be disconnected from the integrated structure, and the fastening strength will be higher than in the conventional structure. It can be said that it is expensive.

Further, the material of the face disk portion and the skirt portion can be selected purely for the purpose of use regardless of whether plastic working is possible, that is, a lightweight and high hardness material (that is, plastic deformation is not possible at all). It is also possible to use new materials such as ceramics). Therefore, it is possible to manufacture an ideal valve lifter that has a small inertial weight and is resistant to wear.

Further, in claims 5 to 8, since the outer shim can be easily replaced, the work of adjusting the gap between the cam and the valve lifter is simple.

[Brief description of drawings]

FIG. 1 is a vertical 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 an essential part of a modified example of the valve lifter according to the first embodiment.

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

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

FIG. 6 is a vertical cross-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 vertical cross-sectional view of the essential parts of another embodiment of the present invention.

FIG. 9 is a vertical cross-sectional view of the essential parts of another embodiment of the present invention.

FIG. 10 is a vertical cross-sectional view of a main part which is still another embodiment of the present invention.

FIG. 11 is a vertical cross-sectional view of a main part which is still another embodiment of the present invention.

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

[Explanation of symbols]

 10 Internal Combustion Engine Valve Lifter 20, 20A Face Disk 21, 21A Projecting Part of Face Disk 22 Recessed Line of Projection 23 Face Edge Peripheral 30, 30A Skirt 31 Inner Flange 40, 40A, 40B of Skirt Ring -Shaped fastening member 40C Fastening member 60 Outer shim S Shim storage chamber

Claims (8)

[Scope of utility model registration request] 1. A valve lifter for an internal combustion engine, wherein a disk-shaped face disk portion is integrally connected to an opening portion of a cylindrical skirt portion, wherein an inner flange portion is provided around the opening portion of the skirt portion.
The face disk portion is formed with a protruding portion that fits in the axial direction with the inner flange portion, a circumferentially extending recess is formed on the outer periphery of the protruding portion, and a ring-shaped fastening is provided on the outer periphery of the protruding portion. Part of the member is plastically deformed and filled in the recess on the protrusion side, and the inner flange portion of the skirt portion is axially clamped and fixed by the ring-shaped fastening member and the peripheral 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 the ring-shaped fastening member is made of a material having greater malleability than both the face disk portion and the skirt portion. 3. The valve lifter for an internal combustion engine according to claim 1, wherein the ring-shaped fastening member is made of a thermoplastic resin, and is thermoplastically deformed to partially fill the recessed line. 4. A valve lifter for an internal combustion engine, wherein a disk-shaped face disk portion is integrally connected to an opening portion of a cylindrical skirt portion, wherein an inner flange portion is provided around the opening portion of the skirt portion.
The face disk portion is formed with a protruding portion that axially fits with the inner flange portion, a circumferentially extending recess is formed on the outer periphery of the protruding portion, and a portion of the outer periphery of the protruding portion is filled with the recessed rib. A valve lifter for an internal combustion engine, wherein the engaged fastening members are integrally molded, and the inner flange portion of the skirt portion is axially sandwiched and fixed by the fastening members and the peripheral portion of the face disk. 5. A valve lifter for an internal combustion engine, wherein a face disk portion is integrally connected to an opening portion of a cylindrical skirt portion, and a replaceable outer shim is provided on the face disk portion, the opening portion of the skirt portion. The inner flange is installed around the
The face disk portion is formed with a protruding portion that fits in the axial direction with the inner flange portion, a circumferentially extending recess is formed on the outer periphery of the protruding portion, and a ring-shaped fastening is provided on the outer periphery of the protruding portion. Part of the member is plastically deformed and filled in the recess on the protrusion side, and the inner flange portion of the skirt portion is axially clamped and fixed by the ring-shaped fastening member and the peripheral 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 greater malleability than both the face disk portion and the skirt portion. 7. The valve lifter for an internal combustion engine according to claim 5, wherein the ring-shaped fastening member is made of a thermoplastic resin, and is thermoplastically deformed to partially fill the groove. 8. A valve lifter for an internal combustion engine, wherein a face disk portion is integrally connected to an opening portion of a cylindrical skirt portion, and a replaceable outer shim is provided on the face disk portion, the opening portion of the skirt portion. The inner flange is installed around the
The face disk portion is formed with a protruding portion that axially fits with the inner flange portion, a circumferentially extending recess is formed on the outer periphery of the protruding portion, and a portion of the outer periphery of the protruding portion is filled with the recessed rib. A valve lifter for an internal combustion engine, wherein the engaged fastening members are integrally molded, and the inner flange portion of the skirt portion is axially clamped and fixed by the fastening members and the peripheral portion of the face disk.