JP2004116717A - Roller holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To resolve a problem in a holder which can be traversed between needle rollers in consideration of a ratio between an axial length of the rollers and a distance between the needle rollers diametrally facing each other, and having a shorter shape than the axial length of the rollers wherein it is unstable in attachment, it easily slants between the needle rollers, and it is difficult to maintain a normal attitude and to securely fit between the needle rollers. <P>SOLUTION: By forming an insertion hole 17 in the roller holder 13, and inserting a support pin part 16 of an attachment jig 12 in the insertion hole 17, even if eccentric force acts on the roller holder 13 during attachment of the roller holder 13 to a cylindrical space 11, an attitude in attachment is positively maintained. Even when a diameter D1 of the roller holder 13 and the axial length L have a relationship of L/D1≤1, slanting of the roller holder 13 in the cylindrical space 11 is prevented, and each needle roller 9 can be positively held by pressing it against a circumferential face of a shaft through hole 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a roller holder used for a cam follower such as a rocker arm provided in a valve train of an automobile.
[0002]
[Prior art]
Generally, a rocker arm is provided in a valve train of an automobile. During manufacture of this type of rocker arm, needle rollers are arranged in a circumferential direction on a peripheral surface of a rocker shaft insertion hole formed at a central portion of a roller to which a cam comes into contact, and these needle rollers are held. There is a need.
[0003]
Conventionally, there has been a holder for holding a needle roller on a peripheral surface of a rocker shaft insertion hole (for example, Patent Document 1).
[0004]
There is also a technique in which the volume of the holder is made as small as possible (for example, Patent Document 2).
[0005]
Hereinafter, a conventional holder will be described with reference to FIGS. 7 and 8. The holder 50 shown in FIG. 7 has a length substantially equal to the axial length of the camshaft insertion hole 54 of the roller 53 disposed between the opposing walls 51 and 52. The holder 50 is formed in a shape close to a column so as to fill almost the entire area between the needle rollers 55 in the radial direction when the holder 50 is mounted in the camshaft insertion hole 54. In the holder 50 having such a shape, since the diameter and the length in the axial direction are different, it is necessary to consider the directionality of the holder 50 when mounting.
[0006]
Therefore, as shown in FIG. 8, by forming the holder 50 in a spherical shape, it is not necessary to consider the direction at the time of mounting, and the volume of the holder 50 is reduced to the holder 50 shown in FIG. 7. It can be smaller than that.
[0007]
In recent years, in the rocker arm, the axial length of the roller 53 tends to be reduced while the shaft diameter of the camshaft 56 remains unchanged. In such a case, if the holder 50 is spherical and the holder 50 is mounted between the needle rollers 55, a part of the holder 50 may protrude from the roller 53 in the axial direction.
[0008]
However, in order to prevent a part of the holder 50 from protruding from the roller 53 when the holder 50 is mounted, if the diameter of the holder 50 is reduced, the length between the axial length and the needle rollers 55 opposed in the radial direction is reduced. Depending on the ratio to the distance, it is conceivable that the holder 50 will not hit the needle rollers 55 this time, and the needle rollers will not be able to be held.
[0009]
[Patent Document 1]
JP-A-3-92621 (see page 5, FIG. 1)
[Patent Document 2]
Japanese Utility Model Application Laid-Open No. 5-14643 (see page 1, Figure 1)
[0010]
[Problems to be solved by the invention]
Therefore, as shown in FIGS. 9A to 9C, the ratio between the length of the roller 53 in the axial direction and the distance between the needle rollers 55 opposed in the radial direction is taken into consideration. And a holder 50 having a shape shorter than the axial length is required. As shown in FIG. 9A, such a holder 50 is mounted between the needle rollers 55 by being pressed at the center by a pressing jig 60.
[0011]
However, the holder 50 can be passed between the needle rollers 55 in consideration of the ratio between the axial length of the roller 53 and the distance between the radially opposed needle rollers 55 as described above, And it has a shape shorter than the axial length. Therefore, this shape is unstable particularly when the device is mounted, and when the central portion is pressed by the pressing jig 60 as shown in the figure, it is easily inclined between the needle rollers 55 as shown in FIGS. It is difficult to mount the needle roller 55 between the needle rollers 55 while maintaining a normal posture.
[0012]
Therefore, an object of the present invention is to provide a roller holder that can solve the above-described problems.
[0013]
[Means for Solving the Problems]
The roller holder in the present invention, in a state where a plurality of rollers are arranged side by side in the circumferential direction of the peripheral surface so as to contact the peripheral surface of the shaft insertion hole formed at the radial center of the cylindrical bearing ring, The mounting jig is mounted in a cylindrical space formed by rollers from one side in the axial direction, and presses each roller against the peripheral surface. A radial length D, an axial length L, Have a relationship satisfying L / D ≦ 1, a receiving surface for receiving the pressing surface of the mounting jig is formed on one side surface in the axial direction, and a support pin portion formed on the mounting jig is inserted. An insertion portion is formed at the radial center portion along the axial direction.
[0014]
In the above configuration, the roller holder is attached so that the support pin of the mounting jig is inserted into the insertion portion, and the roller holder is pressed and mounted on the cylindrical space formed by the rollers from one side in the axial direction. At this time, even if the roller holder has a relationship where the length D in the radial direction and the length L in the axial direction have a relationship of L / D ≦ 1, the roller jig is held in a required posture by the mounting jig. Even after the mounting jig is detached from the roller holder, the rollers are attached to the cylindrical space by the roller holder so that each roller abuts the peripheral surface of the shaft insertion hole formed at the radial center of the raceway ring. Will be retained.
[0015]
In addition, the roller holder of the present invention is provided with a plurality of rollers on an opposing wall facing in parallel and a support shaft extending between the opposing walls, and is rotated around the axis by rolling contact of the cam. During the manufacture of the cam follower including the roller, the roller is mounted in a state where the rollers are arranged in the circumferential direction of the peripheral surface so as to contact the peripheral surface of the spindle insertion hole formed at the radial center of the roller. The jig is attached to the cylindrical space formed by the rollers from one side in the axial direction and holds the rollers by pressing the rollers against the peripheral surface. The radial length D and the axial length L has a relationship of L / D ≦ 1, a receiving surface for receiving a pressing surface of the mounting jig is formed on one side surface, and a support pin portion formed on the mounting jig is inserted. Insertion part is formed along the axial direction at the radial center part. .
[0016]
In the above configuration, the roller holder is attached so that the support pin of the mounting jig is inserted into the insertion portion, and the roller holder is pressed and mounted on the cylindrical space formed by the rollers from one side in the axial direction. At this time, even if the roller holder has a relationship that the radial length D and the axial length L have a relationship of L / D ≦ 1, the cylinder is held in a required posture by a mounting jig. Even after the mounting jig is detached from the roller holder, each roller is brought into contact with the peripheral surface of the shaft insertion hole formed at the radial center of the raceway even after the mounting jig is detached from the roller holder. Will be retained.
[0017]
Further, at least one of the one corner and the other corner of the roller holder is chamfered.
[0018]
According to this configuration, due to the presence of the chamfered portion, the roller holder can be easily inserted into the cylindrical space from one side in the axial direction. The roller holder can be easily mounted from either one side or the other side, and the degree of freedom in direction is increased at the time of mounting.
[0019]
In addition, the insertion portion may be one that penetrates the roller holder, one that is formed in a concave shape, or one that is formed in a slit shape, and when the mounting jig is inserted, What is necessary is just to be able to hold | maintain the attitude | position of a roller holder in a predetermined attitude | position.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example in which the roller holder according to the embodiment of the present invention is applied to a rocker arm will be described with reference to the drawings.
[0021]
1 is an exploded perspective view showing the entire rocker arm, FIG. 2 is a cross-sectional view showing a use state of the rocker arm, FIG. 3 is a cross-sectional view showing a state in which a roller holder is being mounted on a roller, and FIG. It is a side view.
[0022]
First, the overall configuration of the rocker arm shown in the drawing will be described. The rocker arm 1 is an end pivot type and is arranged at a predetermined position in an OHC valve operating mechanism of the engine as shown in FIGS. Reference numeral 2 denotes a cam disposed at a predetermined position of the engine valve mechanism. The rocker arm 1 faces a roller (tubular raceway) 3 on which the cam 2 contacts and rolls via the roller 3. A pair of opposed walls 4 and 5 are provided.
[0023]
A body 22 is formed by the opposing walls 4 and 5 and connecting walls 20 and 21 connecting the opposing walls 4 and 5 on both sides in the longitudinal direction. One connecting wall 20 is used as a pivot receiving portion to which the upper end of the lash adjuster 23 contacts, and the other connecting wall 21 is used as a valve stem fitting portion into which the upper end of the valve stem 24 fits.
[0024]
Support holes 6 and 7 are formed in the opposed walls 4 and 5 at longitudinally intermediate portions. The roller 3 is disposed between the opposing walls 4 and 5, and the roller 3 has a shaft insertion hole 10 formed at a radially central portion thereof and penetrating in the axial direction.
[0025]
A support shaft (also referred to as a “rocker shaft”) 8 is passed through the support holes 6 and 7 so that the end portions 8a and 8b are supported non-rotatably. The support shaft 8 has substantially the same cross section in the axial direction. Although not shown, the support shaft 8 is pressed against the peripheral walls of the support holes 6 and 7 by caulking the end portions 8a and 8b so as to expand in the radial direction, so that the support shaft 8 does not contact the opposing walls 4 and 5. Supported by rotation.
[0026]
The roller 3 is rotatably mounted around a central axis of the support shaft 8 via a plurality of needle rollers 9. The needle rollers 9 are arranged side by side in the circumferential direction of the peripheral surface so as to contact the peripheral surfaces of the support holes 6 and 7. Therefore, each needle roller 9 rolls around the support shaft 8 with the outer peripheral surface of the support shaft 8 and the peripheral surface of the shaft insertion hole 10 in the roller 3 as rolling surfaces.
[0027]
Next, a method of manufacturing the rocker arm 1 having the above configuration will be described. First, one metal plate is punched into a predetermined shape, and subsequently, both support holes 6 and 7 are formed in portions corresponding to the opposing walls 4 and 5 by punching using a processing tool (punch). Then, the opposing walls 4 and 5 and the connecting walls 20 and 21 are formed by bending portions corresponding to the opposing walls 4 and 5. In the figure, the connecting wall 21 is fixed between the opposing walls 4 and 5 by welding.
[0028]
Apart from the above, as shown in FIGS. 1 and 3, a plurality of needle rollers 9 are arranged in the circumferential direction on the peripheral surface of the shaft insertion hole 10 of the roller 3, and the needle rollers 9 are connected to each other. The roller holder 13 is attached to the cylindrical space 11 in the shaft insertion hole 10 formed by using the mounting jig 12 from one side in the axial direction, and each needle roller 9 is attached to the peripheral surface of the shaft insertion hole 10. The roller 3, the needle rollers 9, and the roller holder 13 are assembled as a set 14 by pressing and holding the roller 3.
[0029]
By the way, the roller holder 13 is entirely formed of an elastic material such as a synthetic resin such as polyethylene, polyurethane, nylon, or PP, or a synthetic rubber. The diameter (the maximum radial length) D1 of the roller holder 13 is formed slightly larger than the diameter of the cylindrical space 11.
[0030]
For this reason, when the roller holder 13 is mounted in the cylindrical space 11, each of the needle rollers 9 is pressed against the peripheral surface of the shaft insertion hole 10 by the elasticity of the roller holder 13 restoring radially outward. Will be retained.
[0031]
Here, the configuration of the roller holder 13 will be described in detail. The roller holder 13 is formed such that its diameter D1 and axial length (width direction thickness) L satisfy the relationship of L / D1 ≦ 1. As described above, the diameter D1 of the roller holder 13 is formed slightly larger than the minimum diameter D2 of the cylindrical space 11 formed between the needle rollers 9, and the support holes 6, 7 (particularly, the other one). It is formed smaller than the diameter of the support hole 7). The axial length L of the roller holder 13 is formed smaller than the axial length of the cylindrical space 11, that is, the width B of the roller 3.
[0032]
Further, a flat receiving surface 15 is formed on one side surface pressed by the mounting jig 12, with which a torso plane (pressing surface) 12 a of the mounting jig 12 abuts. An insertion hole (an example of an insertion recess) 17 into which the support pin portion 16 formed to project in the axial direction is inserted is formed in the center portion in the radial direction along the axial direction.
[0033]
The diameter D3 of the insertion hole 17 is formed slightly smaller than the diameter D4 of the support pin portion 16, and in this embodiment, is set to 0.8 to 0.3 times the diameter D1 of the roller holder 13. I have. Further, a chamfer 18 having a corner R shape is formed on the outer peripheral surface at one corner and the outer peripheral surface at the other corner of the roller holder 13.
[0034]
To describe the shape of the chamfer 18 in detail, a corner portion is formed in a large curvature arc 18a, and a center position in the axial direction is formed in a small curvature arc 18b. As described above, the chamfers 18 are formed on both the outer peripheral surface at one corner and the outer peripheral surface at the other corner of the roller holder 13, and the continuous surface 18c between the two chamfers 18 projects radially outward. It is formed on a slightly curved surface.
[0035]
With this configuration, the roller holder 13 is formed symmetrically with respect to the axial center and the radial center. The width of the body plane 12a of the mounting jig 12 is set to a size substantially equal to the diameter D1 of the roller holder 13 or a slightly smaller size.
[0036]
In a state where a plurality of needle rollers 9 are arranged in the circumferential direction on the peripheral surface of the shaft insertion hole 10 of the roller 3, the roller is inserted into the cylindrical space 11 in the shaft insertion hole 10 formed by the needle rollers 9. Attachment of the holder 13 is performed as follows.
[0037]
That is, the support pin 16 formed on the mounting jig 12 is inserted into the insertion hole 17 against the elasticity of the roller holder 13. At this time, the fitting force between the support pin 16 and the holder 13 may be small.
[0038]
In this manner, the roller holder 13 attached to the mounting jig 12 is inserted into the cylindrical space 11 of the roller 3 placed on the mounting table 40 by inserting the center of the diameter D1 of the roller holder 13 into the shaft. The positions of the holes 10 are concentric with each other in the radial direction, and then the mounting jig 12 is moved from one axial direction to the other axial direction so that the roller holder 13 has a cylindrical shape. It is mounted so as to be inserted into the space 11.
[0039]
At this time, as described above, the diameter D1 of the roller holder 13 is formed slightly larger than the minimum diameter of the cylindrical space 11 formed between the needle rollers 9, but the roller holder 13 has a moderate diameter. When pressed with a predetermined pressing force, the outer peripheral portion is elastically deformed by being pressed by the outer peripheral surface of the needle roller 9 so as to reduce the diameter, and the cylindrical space 11 of the roller 3 is elastically deformed. Attached to. The roller holder 13 can be easily inserted into the cylindrical space 11 by being guided by the chamfer 18.
[0040]
When the roller holder 13 is mounted, even if an eccentric force acts on the roller holder 13, the roller holder 13 is inserted into the insertion hole 17 through the support pin 16 of the mounting jig 12. The posture is maintained. For this reason, even if there is a relationship of L / D1 ≦ 1 between the diameter D1 of the roller holder 13 and the axial length L, the roller holder 13 does not tilt in the cylindrical space 11. Can be prevented.
[0041]
After the roller holder 13 is inserted into the cylindrical space 11 and mounted in this manner, the mounting jig 12 is pivoted against the support pin 16 and a slight fitting force with the holder 13. Then, the support pin 16 is removed from the insertion hole 17 in one direction.
[0042]
After the roller holder 13 is mounted in the cylindrical space 11, each needle roller 9 is pressed against the peripheral surface of the shaft insertion hole 10 by the elasticity of the roller holder 13 and held there. As described above, the assembly 14 of the roller 3, the needle rollers 9 and the roller holder 13 is assembled.
[0043]
Then, the assembly 14 is disposed at the center in the longitudinal direction between the opposing walls 4, 5, and the support shaft 8 is changed from the supporting hole 6 formed on one opposing wall 4 to the supporting hole 7 formed on the other opposing wall 5. , The inner diameter side of the roller 3 is inserted so that the end 8 b of the support shaft 8 fits into the support hole 7.
[0044]
Since the diameter D1 of the roller holder 13 is smaller than the diameter of the support hole 7, the operation of inserting the support shaft 8 through the inner diameter side of the roller 3 causes the roller holder 13 of the 7, and the outer peripheral surface of the support shaft 8 comes into contact with the needle rollers 9 instead.
[0045]
Thereafter, both ends 8a and 8b of the support shaft 8 are caulked so as to expand in diameter, and the outer peripheral surfaces of both ends 8a and 8b are pressed against the peripheral surfaces of the support holes 6 and 7, and the support shaft 8 is assembled in a non-rotating manner. wear. The rocker arm 1 is manufactured through the above steps.
[0046]
As described above, according to the embodiment of the present invention, when the roller holder 13 is mounted on the cylindrical space 11, even if an eccentric force acts on the roller holder 13, the roller holder 13 is mounted on the cylindrical space 11. Since the support pin portion 16 of the jig 12 is inserted through the insertion hole 17, the posture at the time of mounting is securely held.
[0047]
For this reason, even if there is a relationship of L / D1 ≦ 1 between the diameter D1 of the roller holder 13 and the axial length L, the roller holder 13 does not tilt in the cylindrical space 11. Therefore, each needle roller 9 can be reliably held by pressing the peripheral surface of the shaft insertion hole 10.
[0048]
Further, the chamfer 18 described above in the roller holder 13 is formed on both the outer peripheral surface at one corner and the outer peripheral surface at the other corner of the roller holder 13, and the roller holder 13 has an axial center and a radial center. Since the insertion holes 17 are formed symmetrically with respect to the center, and the insertion holes 17 are formed so as to penetrate the roller holders 13, the roller holders 13 can be provided from either one side in the axial direction or the other side in the axial direction. Can also be mounted in the shaft insertion hole 10, and therefore, the degree of freedom in direction when the roller holder 13 is mounted can be increased.
[0049]
In addition, in the said embodiment, although the insertion hole 17 which penetrated the roller holder 13 as an example of an insertion part was formed, it is not limited to this. For example, although the degree of freedom of direction is reduced, as shown in FIG. 5, a cylindrical concave portion 30 which does not penetrate the roller holder 13 is formed as an insertion portion, and when the roller holder 13 is mounted, The support pin 16 of the jig 12 may be inserted into the cylindrical recess 30 to perform the operation. The roller holder 13 has the same configuration as that of the above embodiment except that the shape of the insertion portion is replaced by the cylindrical recess 30 from the insertion hole 17.
[0050]
As shown in FIG. 6, an insertion slit 31 having a predetermined depth in the axial direction is formed from the receiving surface 15 so as to form an insertion portion. When the roller holder 13 is mounted, the support pin portion 16 is inserted. The roller holder 13 may be mounted by inserting the roller holder 13 into the slit 31 so as to spread it. In any case, the roller holder 13 can be mounted in the shaft insertion hole 10 in a state where the roller holder 13 is held in an appropriate posture by the mounting jig 12. Can be mounted between 4 and 5.
[0051]
【The invention's effect】
As is apparent from the above description, according to the present invention, even if the roller holder has the relationship of L / D ≦ 1 between the diameter D and the axial length L, the posture required by the mounting jig is required. It can be mounted in a cylindrical space while holding it, and even after removing the mounting jig from the roller holder, keep each roller in contact with the peripheral surface of the shaft insertion hole of the raceway ring Can be.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an entire rocker arm according to an embodiment of the present invention.
FIG. 2 is a sectional view showing a use state of the rocker arm.
FIG. 3 is a cross-sectional view showing a state in which a roller holder is being mounted on a roller.
FIG. 4 is a side view of the roller holder.
FIG. 5 is a cross-sectional view of a roller holder according to another embodiment.
FIG. 6 is a perspective view of a roller holder according to another embodiment.
FIG. 7 is a cross-sectional view illustrating a use state of a roller holder according to a conventional example.
FIG. 8 is a cross-sectional view illustrating a use state of a roller holder according to another conventional example.
FIG. 9 is a cross-sectional view showing a state of use of a roller holder according to still another conventional example.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 rocker arm 2 cam 3 roller 4, 5 opposing wall 6, 7 support hole 8 support shaft 9 needle roller 10 shaft insertion hole 11 cylindrical space 12 mounting jig 13 roller holder 14 assembly 20, 21 connecting wall

Claims (3)

In a state where a plurality of rollers are arranged in a circumferential direction of the peripheral surface so as to abut against a peripheral surface of a shaft insertion hole formed at a radial center of the cylindrical bearing ring, a roller is mounted by a mounting jig. A roller holder which is attached to a cylindrical space formed between the members from one side in the axial direction and holds the rollers by pressing the rollers against the peripheral surface,
The radial length D and the axial length L have a relationship satisfying L / D ≦ 1, and a receiving surface for receiving a pressing surface of the mounting jig is formed on one axial side surface. A roller holder, wherein an insertion portion into which a support pin portion formed on a jig is inserted is formed at a radially central portion along an axial direction. In the course of manufacturing a cam follower including a parallel opposing wall and a roller that is externally mounted via a plurality of rollers on a spindle passed between the opposing walls and that rotates about the axis by rolling contact of the cam. ,
In a state where the rollers are arranged side by side in the circumferential direction of the peripheral surface so as to abut on the peripheral surface of a shaft insertion hole formed at the radial center of the roller, the rollers are formed by rollers by a mounting jig. A roller holder that is attached to the cylindrical space from one side in the axial direction and holds the rollers by pressing the rollers against the peripheral surface,
The length J in the radial direction and the length L in the axial direction satisfy a relationship of L / D ≦ 1, and a receiving surface for receiving a pressing surface of the mounting jig is formed on one side surface, and the mounting jig is formed. The insertion part into which the support pin part formed in (1) is inserted is formed along the axial direction at a radially central portion. The roller holder according to claim 1 or claim 2,
A roller holder characterized in that at least one of the one-side corner and the other-side corner is chamfered.

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