JPH1018813A - Adjust bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connection between a bolt body to a stem cap and prevent separation of them without increasing the number of items in the case that an adjust bolt for adjusting an abutting angle and a gap between members is composed of a combined body of the bolt body and the stem cap. SOLUTION: A bolt body 2 has a large diameter part 6 integrated with a screw 4. A leading end part 8 including the large diameter part 6 is housed in a housing part 11 of a stem cap 3. Side wall pieces 12 divided by cutting portions 13 on an opening end of the stem cap 3 are caulked inwardly of the opening, to form a stopper part 12 projected inward. A small diameter part 3a having the diameter smaller than the outer diameter of the large diameter part 6 of the bolt body 2 is formed by the projection end of the stopper part 12. The leading end 8 of the bolt body is prevented from slipping off from the stem cap 3 by means of the small diameter part 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is, for example, disposed between the rocker arm 34 and the valve 32 or between the rocker arm 34 and the push rod 37, as shown by reference numeral 1 in FIGS. And an adjusting bolt for transmitting force and adjusting the contact state.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 12 (a), a bolt body 100 having a convex spherical surface 101 at a front end portion, a large diameter portion 102 adjacent thereto, and a screw portion 103, and a container-like bottom portion. Cap 10 having a concave spherical surface 105
There is an adjusting bolt 110 connecting the first and second bolts 6. This is because the large-diameter portion 102 of the bolt body 100 is inserted into the accommodation portion 107 of the stem cap from the insertion opening 108 and the convex spherical surface 101 and the concave spherical surface 105 come into contact with each other.
Reference numeral 00 denotes a structure capable of rotating relative to the stem cap 106 in an arbitrary direction.

[0003]

Here, the insertion port 108
Is slightly smaller than the outer diameter of the large-diameter portion 102, and the bolt body 100 is assembled to the stem cap 106 by press-fitting the large-diameter portion 102.
If the dimensional accuracy of the insertion opening 108 is not proper, an assembly failure occurs. For example, the outer diameter of the large-diameter portion 102 is
8 is too small, the bolt body 100 falls out of the stem cap 106. Conversely, if the outside diameter of the large diameter portion 102 is too large compared to the inside diameter of the insertion port 108, it becomes difficult to press-fit the bolt body 100. Therefore, the bolt body 1
The large-diameter portion 102 and the insertion opening 108 of the stem cap 106 are finished by cutting or the like so as to be within the allowable tolerance, but they require high-precision processing, so that the cost increases and And the yield is low.

Further, as disclosed in Japanese Patent Publication No. 5-24363, the upper peripheral wall portion of the stem cap 106 is formed as a separate member as an assist cap.
In some cases, after the bolt body 100 is inserted from below into the 08, the assist cap is swaged to the stem cap so as to hold the stem cap. However, in this case, three parts of the bolt body, the assist cap and the stem cap are required.

An object of the present invention is to provide an adjust bolt which does not require high-precision cutting or the like and can minimize the number of parts.

[0006]

The features of the present invention are as described in claims 1 to 5, but the point is that the distal end portion including at least the large-diameter portion of the bolt body is provided. An inwardly projecting stopper is formed on the opening side of the accommodating portion for accommodating, and a reduced-diameter portion having an inner diameter smaller than the large-diameter portion of the bolt body is provided by the protruding end of the stopper. This stopper portion, after accommodating the large diameter portion of the bolt body and the like in the accommodating portion of the stem cap, bends so as to protrude inward at an arbitrary portion of the opening end of the accommodating portion.
It can be obtained by plastic deformation by caulking or the like. For example, claw-shaped stopper portions can be formed at a plurality of locations on the outer periphery of the opening end at equal angular intervals toward the center of the housing portion. In this case, if a plurality of cut portions are appropriately formed at the opening end of the stem cap and a plurality of side wall pieces between the cut portions are bent inward, the processing is easy. After the distal end portion of the bolt body is accommodated in the accommodation portion of the stem cap, the entire periphery of the open end of the stem cap may be deformed inward to provide an annular stopper.

Further, a plurality of V-shaped notches may be provided at the opening end of the stem cap at equal angular intervals, for example, and these may be bent inward to form stoppers. By doing so, it is easy to use the entire periphery of the opening of the housing portion as the stopper portion.

According to a fifth aspect of the present invention, the side wall of the open end of the stem cap is cut into a plurality of parts by cutting or the like, and these side wall pieces are bent inward so as to protrude inward and beyond a right angle. A reverse tapered stopper having a smaller diameter toward the bottom of the storage section, and the stopper has a protruding end.
A reduced diameter portion having an inner diameter smaller than the outer diameter of the large diameter portion of the bolt body can be formed. Then, push the large-diameter part of the bolt body from the opening side of the stem cap toward the bottom side, and pass the stopper part while elastically deforming the stopper part in the radially expanding direction. Then, it plays a role of retaining the large diameter portion.

As described above, after the large-diameter portion of the bolt body is accommodated in the stem cap, the opening end is protruded inward by caulking or the like to form a stopper portion, or the stopper portion is protruded in advance. In addition, by making the large-diameter portion of the bolt body pushed in while elastically deforming it, the outer diameter of the large-diameter portion and the inner diameter of the reduced-diameter portion defined by the protruding end of the stopper portion are: Not so high dimensional accuracy is required. Therefore, high-precision precision machining can be omitted, and the number of parts does not need to be increased with the two members of the bolt body and the stem cap. For convenience of manufacture, etc., the stem cap, for example, a bottom part and a peripheral wall part, are integrally assembled as two parts, and the bolt body is inserted into this, and the opening is for example crimped to prevent the cap from coming off. It does not hinder the formation of the stopper portion for use.

[0010]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. The adjusting bolt 1 shown in FIGS. 1 and 2 includes a bolt main body 2 and a stem cap 3, and the bolt main body 2 has a thread portion 4 formed in a male thread shape, and further extends from one end of the thread portion 4. In addition, the tapered portion 5 having a gradually expanding inclination is provided. A large-diameter portion 6 having a flat cylindrical surface shape having a maximum outer diameter is formed at the end of the tapered portion 5. A sphere 7 is provided. Hereinafter, the tapered portion 5, the large diameter portion 6, and the convex sphere portion 7 are collectively referred to as a distal end portion 8, but the bolt body 2 includes the distal end portion 8 and the screw portion 4. A tool groove 9 for turning the bolt body 2 using a tool or the like is formed on the other end side of the screw portion 4.

As shown in FIG. 2, the stem cap 3 has a flat lower end surface, a cylindrical side wall with an open upper side, and a seat for the convex spherical portion 7 of the bolt body 2 on the inner bottom surface. A concave spherical portion 10 serving as a surface is formed substantially at the center of the bottom surface. Note that a concave spherical surface may be provided on the bolt body 2 side and a convex spherical surface may be provided on the stem cap 3 side. The inner diameter of the cylindrical side wall of the stem cap 3 is larger than the outer diameter of the large diameter portion 6, and the inside of the cylindrical side wall has a housing portion 11 for housing the distal end portion 8 of the bolt body 2 with a predetermined gap. Become. With the distal end portion 8 of the bolt body 2 housed, the stem cap 3
The stopper 1 protrudes inward (inward) on the opening side of
2 are formed. In the stem cap 3 shown in FIG. 1, three stopper portions 12 are formed at equal angular intervals in the circumferential direction, and the protruding ends of the stopper portions 12 projecting inward in this manner allow the large diameter portion 6 of the bolt body 2 to be formed. A reduced diameter portion 3a having an inner diameter smaller than the outer diameter is formed.

As shown in FIG. 3, the stem cap 3 before being assembled to the bolt main body 2 has notches 13 in the form of thin grooves (slits) formed in the depth direction from the opening end. Between them, a divided side wall piece 12 is formed. The distal end portion 8 of the bolt body 2 is inserted into the stem cap 3 from the opening thereof, and is housed in the housing portion 11.
2 is subjected to bending (caulking) so as to protrude substantially 90 degrees inward from the cylindrical inner wall surface. The distal end (projecting end) of each of the three side wall pieces 12 bent inward forms the above-described reduced diameter portion 3a. When the convex spherical portion 7 of the bolt body 2 is seated on the concave spherical portion 10 of the stem cap 3, the inner diameter of the reduced diameter portion 3a is such that a predetermined amount of rotation (oscillation) with the spherical surfaces as fulcrums mutually. It is set appropriately to such an extent as to allow and prevent the distal end portion 8 including the large diameter portion 6 from passing through the reduced diameter portion 3a. As shown by phantom lines in FIG. 3, the notch portion 14 is formed between the side wall pieces 12 of the stem cap 3 before assembly, and the side wall pieces 1 left in an upwardly projecting shape.
2 may be bent inward from the opening end.

As in another embodiment shown in FIG. 4, a V-shaped notch 15 in the depth direction is formed at the opening end of the stem cap 3 before being connected to the bolt body 2 at an equal angle in the circumferential direction. It can also be formed at intervals. A trapezoidal side wall piece (stopper part) 12 is formed between the notches 15. Then, as shown in FIG. 5, after the distal end portion 8 of the bolt body 2 is accommodated in the stem cap 3, the adjacent side edges 16 of the trapezoidal side wall pieces 12 are brought close to or in contact with each other. All trapezoidal side wall pieces 12 are bent inward to form a tapered stopper portion 12 having a smaller diameter toward the opening side of the stem cap 3 by assembling them. A series of protruding ends (tips) of the stoppers (sidewall pieces) 12 forms a reduced diameter portion 3 a having an inner diameter smaller than the outer diameter of the large diameter portion 6 of the bolt body 2.

A stem cap 22 according to another embodiment shown in FIG. 6 has a stopper portion 17 projecting inward from a cylindrical inner wall portion in a state in which the distal end portion 8 of the bolt body 2 is accommodated in the same manner as described above. For example, it is formed on the entire circumference in the circumferential direction or at a plurality of locations in the circumferential direction. The plurality of or annularly connected stopper portions 17 form a reduced diameter portion 3 a having an inner diameter smaller than the large diameter portion 6. Such a stopper portion 17 restrains the open end of the stem cap from the outside with a predetermined tool to prevent or suppress outward deformation, and at least the inner peripheral end surface of the open end is a predetermined caulking tool. And can be obtained by plastic deformation such that the flesh near the opening bulges inward (extrudes). For example, if three places in the circumferential direction are caulked in the same manner as in FIG. 3, three stopper portions 17 are formed at equal intervals.

Another embodiment of the stem cap 2 shown in FIG.
3 is, for example, shown in FIG.
A plurality of side wall pieces 12 formed at the open end portions are bent inward by more than 90 degrees in advance like a stem cap 3 shown in FIG. This is the part 18. In other words, the angle θ in FIG. 7 is an acute angle, and the bent side wall piece (stopper portion) 18 is inclined so as to make the opening smaller in the depth direction of the stem cap 3. As shown in FIG. 4, a large number of side wall pieces arranged close to each other in the circumferential direction of the stem cap 3 are bent at an acute angle as shown in FIG. 7, and the bent side wall pieces 18 are slightly spaced from each other. It is good also as an adjacent form.

In any case, when the bolt body 2 is inserted from the opening side of the stem cap 23, the group of the inversely tapered stopper portions 18 having a larger diameter toward the opening side enlarges the reduced diameter portion 3a. Elastically deforms in the direction
Is allowed to pass through the stopper portion 18. After passing through the stopper portion 18, the stopper portion 18 elastically returns, and even if a force acts in the direction in which the bolt body 2 is pulled out, the stem cap 23 and The bolt body 2 is prevented from coming off (falling out).

The adjusting bolt 1 as described above is shown in FIG.
As shown in FIG. 11, for example, a valve train 30 of an internal combustion engine
The movement of the rocker arm 34, which is incorporated in a to d and swings in accordance with the rotation of the camshaft 31, is transmitted to the valve 32 and is opened and closed. For example, the screw 4 of the bolt body 2 is screwed into a screw hole 35 formed at the end of the rocker arm 34, and a nut 36 is tightened and fixed from the end of the screw 4. At the time of assembling such an adjustment bolt 1, the connection state between the bolt main body 2 and the stem cap 3 is maintained and these can be handled as one assembly, so that the assembling work is easy.

In the valve operating device 30a shown in FIG. 8, the adjustment bolt 1 is interposed between the rocker arm 34 and the valve stem 33, and the outer bottom surface of the stem cap 3 contacts the end surface of the valve stem 33. Then, the swing of the rocker arm 34 is transmitted to the valve 32. The adjusting bolt 1 used in the valve operating device 30b of FIG. 9 has a screw portion 19 formed integrally with the stem cap 3 having an outer periphery of a hexagonal portion or the like. The screw portion 19 fixes the stem cap 3 to the cylinder block 38. You. Further, the camshaft 31 is disposed so as to abut on an intermediate portion of the rocker arm 34, and the rocker arm 34 swings around the stem cap 3 as a fulcrum. The valve gear 30c shown in FIG.
A push rod 37 is interposed between the rocker arm 34 and the camshaft 31. The valve train 30d shown in FIG.
This is an example in which the adjusting bolt 1 is incorporated between the adjusting bolt 1 and the adjusting bolt 4.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an adjustment bolt of the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a perspective view showing a stem cap before being connected to the bolt body of FIGS. 1 and 2;

FIG. 4 is a perspective view showing a modification of the stem cap.

FIG. 5 is a sectional view showing an adjustment bolt using the stem cap shown in FIG. 4;

FIG. 6 is a sectional view showing another modification of the stem cap.

FIG. 7 is a sectional view showing still another modified example.

FIG. 8 is a sectional view showing a first example of a valve train using the adjustment bolt of the present invention.

FIG. 9 is a cross-sectional view showing a second example of the valve mechanism.

FIG. 10 is a sectional view showing a third example of the valve train.

FIG. 11 is a sectional view showing a fourth example of the valve train.

FIG. 12 is a front sectional view showing a conventional adjust bolt and its problems.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adjusting bolt 2 Bolt body 3,22,23 Stem cap 3a Reduced diameter part 4 Screw part 6 Large diameter part 7 Convex ball part 8 Tip side part 10 Concave ball part 11 Housing part 12,18 Stopper part (side wall piece) 13, 15 Notch 17 Stopper 30a-30d Valve mechanism 32 Valve 34 Rocker arm 37 Push rod

Claims (5)

[Claims] 1. A bolt body, and a stem cap rotatably connected to a distal end of the bolt main body, wherein the bolt main body is formed on a shaft-shaped screw portion and a distal end side of the screw portion. A main body-side contact portion, a large-diameter portion formed between the main body-side contact portion and the screw portion with an outer diameter larger than the screw portion, while the stem cap has a bottomed container shape, And a cap-side contact portion that rotatably contacts a bottom portion of the bolt body with the body-side contact portion of the bolt body, the housing portion including a tip portion including at least the large-diameter portion. Further, a stopper portion protruding inward is formed on the opening side of the housing portion,
An adjusting bolt comprising a reduced diameter portion having an inner diameter smaller than an outer diameter of a large diameter portion of the bolt body by a projecting end of the stopper portion. 2. Prior to forming the stopper portion, after a distal end portion including at least the large-diameter portion of the bolt body is accommodated in the accommodation portion of the stem cap, an arbitrary portion of an opening end of the accommodation portion is provided. The stopper portion is plastically deformed by bending, caulking or the like so as to protrude inward to form the stopper portion, and the projecting end of the stopper portion forms a reduced diameter portion having an inner diameter smaller than the outer diameter of the large diameter portion of the bolt body. The adjusting bolt according to claim 1, wherein the bolt body and the stem cap are prevented from coming off. 3. An opening end of the housing portion of the stem cap before the stopper portion is formed is a cylindrical end portion.
A plurality of cut portions are provided at predetermined positions in the circumferential direction of the cylindrical end portion, and after inserting a tip end portion including at least the large diameter portion of the bolt main body into the housing portion, a gap between the cut portions is provided. The adjusting bolt according to claim 2, wherein a plurality of side wall pieces are bent inward to form claw-shaped stopper portions at predetermined intervals in the circumferential direction. 4. An opening end of the housing portion of the stem cap before the stopper portion is formed is a cylindrical end portion.
A plurality of V-shaped cut portions are provided at predetermined intervals in the circumferential direction at the cylindrical end portion, and a distal end portion including at least the large-diameter portion of the bolt body is inserted into the housing portion, and then the cut is performed. The adjust bolt according to claim 2, wherein the stopper portion is formed by bending a plurality of side wall pieces inward between the portions so that side edges of the side wall pieces come close to or come into contact with each other. 5. A plurality of side wall pieces which are separated from each other at an arbitrary position in a circumferential direction at an opening end of the housing portion and are bent inward beyond a right angle so as to protrude inward and beyond a right angle. A reverse taper-shaped stopper portion having a smaller diameter toward the bottom of the bolt body, and a reduced diameter portion having an inner diameter smaller than the outer diameter of the large diameter portion of the bolt body is formed by the protruding end of the stopper portion. The large-diameter portion is pushed into the reduced-diameter portion from the opening side to the bottom side of the housing portion to allow the large-diameter portion to pass through the stopper portion while elastically deforming the stopper portion in the radially-extending direction. 2. The adjusting bolt according to claim 1, wherein the stopper portion is elastically restored to prevent the large diameter portion from being detached from the stopper portion.