JP2002039201A - Retaining tool for roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a needle roller is inclined along an inclined face and thereby a retaining state of the needle roller is unstable when an annular press portion is pressed out of a through-hole, because of a large difference between the rigidity of one side and that of the other side of the annular press portion. SOLUTION: A press face 6a of the annular press portion 6 has arcs formed so that they are projected to the outside in a diameter direction and they are symmetrical to each other at a center of symmetry C in an axial direction of the annular press portion 6. Therefore, one side and the other side of the center of symmetry C in the axial direction of the annular press portion 6 are equal in rigidity to each other. The needle roller 14 is held with equal retaining force at both sides thereof, and is stably held in parallel to a roller 3 without inclination of the needle roller 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, when manufacturing a rocker arm (cam follower) for opening and closing a valve provided on a cylinder head, and uses rollers (for example, needle rollers) on the inner peripheral surface of an outer ring. And a roller holder for holding the roller.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 6, a rocker arm is tilted by a cam 50 to open and close a valve provided on a cylinder head. The figure shows a rocker arm 51 called an end pivot type.

[0003] Such a rocker arm 51 is manufactured as follows. That is, as shown in FIG. 7, the needle rollers 53 are arranged side by side along the inner circumferential orbital surface of the roller 52 that comes into contact with the cam 50, and the roller holder 58 is inserted into the roller 52, whereby the needle roller 53 is inserted. Against the inner circumferential raceway surface to be held. Then, the assembly of the rollers 52 and the needle rollers 53 configured as described above is disposed between the roller support walls 55 formed on the body 54 of the rocker arm 51, and is inserted between the insertion holes 56 formed on the roller support walls 55. Push the support shaft 57 from one side so that it can be inserted, and
8 is pushed out from the other insertion hole 56.

As shown in FIGS. 7 and 8, the roller holder 58 has an annular pressing portion 59 for pressing the needle roller 53 and a radially continuous portion between the ends of the annular pressing portion 59. And a disk-shaped support portion 60 formed as described above. The outer peripheral surface of the annular pressing portion 59 has an inclined surface 59 a on the insertion side and a needle roller 5.
3 and a horizontal surface 59b that abuts on the third surface 3b.

[0005] As shown in FIG. 8, one of the mold members 61 and the other mold member 62 of the roller holder 58 are joined so that the mold is formed at the boundary between the inclined surface 59a and the horizontal surface 59b. Molded.

[0006]

The roller holder 58 is provided with an annular pressing portion 59 for pressing the needle rollers 53 and a disk-like supporting portion 6 which is continuous between the ends of the annular pressing portion 59.
0, but the disc-shaped support portion 60 is
9, the rigidity (the amount of flexure) differs greatly between one side and the other side of the annular pressing portion 59.

As described above, the rigidity of one side of the annular pressing portion 59 is largely different from that of the other side, so that the needle roller 53 is held or the annular pressing portion 59 is pushed out from the other insertion hole 56. At this time, as shown in FIG.
As a result, the needle roller 3 is in an unstable holding state because it is inclined along the inclined surface 59a.
End portion of the support shaft 55 is caught between the roller support wall 55 and the roller 52 of the rocker arm 51, so that the support shaft 57 cannot be mounted smoothly.

Further, the disk-shaped support portion 60 of the roller holder 58
Is formed so that the end thereof is continued by the disc-shaped support portion 60 and the mold is formed at the boundary between the inclined surface 59a and the horizontal surface 59b, so that the mating surface position of the mold members 61 and 62, that is, A burr 59c is generated at a position where the inclined surface 59a and the horizontal surface 59b change.

When the roller holder 58 is extruded by the support shaft 57, as shown in FIG.
c may be scraped off at the corner of the inner peripheral surface of the insertion hole 56 of the support wall 55. If the shavings of the burrs 59c remain in the assembly of the rollers 52 and the needle rollers 53, they adversely affect the rotation of the rollers 52 and the needle rollers 53, and the rocker arm 51 cannot operate smoothly.

Therefore, an object of the present invention is to provide a roller holder that can solve the above-mentioned problems.

[0011]

Means for Solving the Problems In the present invention, a plurality of bearing rollers are arranged side by side on the inner peripheral surface of an outer ring, and the bearing rollers are inserted into the outer ring until the support shaft is inserted into the outer ring. In order to hold on the inner peripheral surface of the holder, the retainer body includes an annular pressing portion that abuts against the bearing rollers, and a supporting portion formed on the inner peripheral surface of the pressing portion to support the pressing portion, The support portion is formed at the axial center position of the inner peripheral surface of the pressing portion, and on the outer peripheral surface of the pressing portion, on both sides around the axial center position, the axial center position is centered. Symmetrical pressing protruding surface is formed.

The pressing portion is formed so that a center position of the outer peripheral surface in the axial center direction is a mold breaking position.

In the above configuration, with the plurality of bearing rollers arranged side by side on the inner peripheral surface of the outer ring, the holder main body is inserted into the outer ring so that the pressing protruding surface of the pressing portion is brought into contact with the bearing rollers. Then, each bearing roller is evenly supported on both sides by the symmetrical pressing protruding surface centered on the axial center position.

Further, when the holder body is pushed out by the support shaft, the pressing protruding surfaces of the pressing portion are formed on both sides around the axial center position in a symmetrical shape about the axial center position. As a result, the rigidity of one side and the other side at the axial center position of the pressing portion is equal, so that the bearing rollers are held with equal holding force on both sides thereof, and each bearing roller tilts. Without being held parallel to the outer ring.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A roller holder according to an embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a roller holder 1 according to an embodiment of the present invention is used, for example, in a rocker arm 2 attached to an OHC engine, and has an inner peripheral surface of a roller (also serving as an outer ring of a bearing) 3. The bearing rollers (hereinafter referred to as “needle rollers”) 4 are inserted into the insertion holes 5 of the rollers 3 in a state of being arranged side by side in the circumferential direction, and these needle rollers 4 are temporarily pressed against the inner peripheral surface of the rollers 3. It is for holding.

Then, as shown in FIG.
The main body 1A is made of an elastic material (for example, synthetic resin).
A pressing ring portion 6 that comes into contact with the needle roller 4 and a support that is formed radially continuously at an axial center position C on the inner peripheral surface of the pressing ring portion 6 to hold the pressing ring portion 6 in an annular shape. Panel 7
And is formed from

Roller pressing surfaces 6a, which are the outer peripheral surfaces of the pressing ring portions 6, are formed on both sides of the axial center position C of the outer peripheral surface of the pressing ring portion 6, and each pressing surface 6a is positioned at the axial center position C. One end is formed in an arc shape slightly convex outward in the radial direction D.

The shoulder 6b of the pressing ring 6 is formed so as to be inclined at an arc toward the axis P at a steeper angle than the tangent angle of the pressing surface 6a, as shown in FIG. The width of the pressing ring 6 in the axial direction is smaller than the width of the roller 3 in the axial direction, and the roller holder 1 has a substantially I-shaped cross section at the center due to the above configuration.

Further, as shown in FIGS. 1, 2 and 4, an inner peripheral surface on one side of the pressing ring 6 is used to pull out the product, that is, the roller holder 1 from the other mold member 10 described later. Is formed at the center of the outer peripheral surface of the support plate 7,
A guide groove 15 (which will be described later) for facilitating the flow of the molding material and a gate portion 16 having a relative shape are formed in 14.

As shown in the enlarged view of FIG.
On the outer peripheral surface at the axial center position C, a small arc-shaped burr 17 is formed by molding, and the center vertex position of this burr 17 is set to be lower than the vertex position of each roller pressing surface 6a. I have.

The roller holder 1 having such a configuration is formed as follows. That is, as shown in FIG. 4, the other mold member 10 having the concave portion 13 having a relative shape to the other half cross-sectional shape of the roller holder 1 and one half cross-section of the pressing ring portion 6 of the roller holder 1. The one mold member 11 having the concave portion 14 having the shape is combined, and the drawing jig 18 is attached to the center of the one mold member 11. The drawing jig 18 has an annular groove 12a for forming the drawing ridge 12 on the outer peripheral surface of the end portion. Further, the end face has the guide groove 15 having a relative shape to the gate section 16 having an arc surface.

When the mold members 10 and 11 and the drawing jig 18 are installed in this way and the molding material is supplied to the guide groove 15, the molding material is smoothly filled into the recesses 13 and 14 by the guide groove 15. You.

After the molding material is cured, first, one of the mold members 11 is removed. At this time, since the roller pressing surface 6a of the pressing ring portion 6 is formed in a circular arc shape projecting radially outward from the axial center position C, the roller pressing surface 6a is forcibly removed. Is small, there is no adverse effect such as shape deformation on the product.

After the pull-out jig 18 is pulled after the above, the product and the pull-out jig 18 are in a state where the pull-out ridge 12 and the annular groove 12a are engaged with each other. Is pulled out of the concave portion 13 of the other mold member 10.

Finally, the drawing jig 18 is connected to the drawing ridge 1.
2 and the annular groove 12a are forcibly pulled out of the product against the engaging force, and the production is completed.

Roller holder 1 manufactured as described above
Is used as follows. That is, similarly to the case shown in the prior art, the needle rollers 4 are arranged side by side on the inner circumferential raceway surface of the roller 3 and temporarily fixed, and in this state, the insertion holes 5 of the roller 3 are inserted.
The roller holder 1 is inserted to hold the needle roller 4 on the inner circumferential raceway surface of the roller 3.

At this time, since the roller pressing surface 6a of the pressing ring 6 is formed in an arc-shaped symmetrical shape protruding radially outward with respect to the axial center position C, the roller pressing surface 6a The rigidity of one side and the other side of the axial center position C is equal, so that each needle roller 4 is held on both sides thereof with an equal holding force, and the roller 3 is not tilted. Are held in parallel with. Then, the assembled assembly is arranged between the roller support walls 20.

Next, the roller support wall 20 of the rocker arm 2
The support shaft 23 is passed through one of the insertion holes 21 so that the support shaft 23 is inserted between the insertion holes 21 and 22 formed in the support shaft 2.
By 3, the roller holder 1 is pushed out from the other insertion hole 22. Further, since the support disk portion 7 for holding the pressing ring portion 6 in an annular shape is formed at the axial center position C on the inner peripheral surface of the pressing ring portion 6, one side of the pressing ring portion 6 and the other side are provided. When the roller holder 1 is pushed out by the support shaft 23 and the other roller pressing surface 6a is pushed out, only the one roller pressing surface 6a remains, and the holding force is equal. It is weaker than the case where the board 7 is biased,
Therefore, each needle roller 4 is less likely to tilt, and the support shaft 23 can be smoothly attached to the rocker arm 2.

Furthermore, the axial center position C of the roller holder 1
Is formed on the outer peripheral surface of a small arc-shaped flash 17 by molding.
However, since the central vertex position of the burrs 17 is set lower than the vertex position of each roller pressing surface 6a, when the roller holder 1 is pushed out by the support shaft 23, Can be prevented from being scraped off at the corners of the insertion holes 22 of the roller support wall 20, so that the cuttings of the burrs 17 do not remain on the rocker arm 2.
The rocker arm 2 can be smoothly operated without adversely affecting the rotation of the needle rollers 4 and the rotation of the needle rollers 4.

In the above embodiment, the support shaft 23 is inserted from one insertion hole 21 to the other insertion hole 22. However, the present invention is not limited to this. Since the roller holder 1 in the embodiment has a symmetrical shape in the axial direction about the support board 7, for example, the support shaft 23
Is inserted from the other insertion hole 22 to the one insertion hole 21, the same effect can be obtained in this case as well.

Further, in the above embodiment, the pressing ring 6
The axial width of the roller 3 is smaller than the axial width of the roller 3, but is not limited thereto.
May be formed to be larger than the width of the roller 3 in the axial direction, and may be applied to, for example, the rocker arm 2 having a configuration in which washers 30 are mounted on both sides of the roller 3 as shown in FIG. In this case, as shown by a virtual line in the figure, when the washer 30 moves in the radial direction, the washer 30 is moved.
The inner peripheral surface of the pressing ring 6 against the shoulder 6b of the pressing ring 6,
Since the movement of the washer 30 in the radial direction can be prevented, the rocker arm 2 having the washer 30 can easily mount the support shaft 23.
Other functions and effects are the same as those of the above embodiment.

[0032]

As is apparent from the above description, the present invention provides an annular pressing portion in which the holder main body abuts the roller for bearing, and an inner peripheral surface of the pressing portion for supporting the pressing portion. The supporting portion is formed at an axial center position of the inner peripheral surface of the pressing portion, and the shaft is formed on the outer peripheral surface of the pressing portion on both sides around the axial center position. Since the pressing protruding surface of the symmetrical shape centered on the center position in the center direction is formed, when the holder body is inserted into the outer ring so that the pressing protruding surface of the pressing portion is brought into contact with the bearing rollers, the pressing protruding surface is formed. Thereby, each bearing roller is evenly supported on both sides, and the bearing roller can be held in a state parallel to the outer ring without tilting.

Further, the pressing protruding surface of the pressing portion is formed in a symmetrical shape on both sides of the center position in the axial direction as a center with respect to the center position in the axial direction.
The rigidity of one side and the other side of the axial center position of the pressing portion is equal, and therefore, when the holder body is pushed out by the support shaft, the bearing rollers are held on both sides thereof with an equal holding force, Each bearing roller can be held parallel to the outer ring without tilting.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a use state of a roller holder according to an embodiment of the present invention.

FIG. 2 is a sectional view of the roller holder alone.

FIG. 3 is an enlarged view of an outer peripheral surface of the roller holder at an axial center position.

FIG. 4 is a cross-sectional view showing a molded state of the roller holder.

FIG. 5 is a cross-sectional view showing a use state of a roller holder according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a use state of a general rocker arm.

FIG. 7 is a cross-sectional view illustrating a use state of a conventional roller holder.

FIG. 8 is a cross-sectional view showing a molded state of the roller holder. .

FIG. 9 is a partially enlarged cross-sectional view showing a state where the needle rollers are inclined.

FIG. 10 is a cross-sectional view showing a state where burrs generated on the mold part are cut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller holder 2 Rocker arm 3 Roller 4 Needle roller 5 Insertion hole 6 Press ring part 7 Support board part

Claims (2)

[Claims] 1. A roller holder for holding a bearing roller on an inner peripheral surface of an outer ring in a state where a plurality of bearing rollers are arranged side by side on an inner peripheral surface of an outer ring, until a support shaft is inserted through the outer ring. An annular pressing portion in which the holder main body abuts the roller for bearing, and a supporting portion formed on an inner peripheral surface of the pressing portion to support the pressing portion, wherein the supporting portion is provided with the pressing portion. A symmetric pressing protruding surface formed at the axial center position of the inner peripheral surface of the portion and on both sides of the outer peripheral surface of the pressing portion centered on the axial center position, and having the axial center position as an end. A roller holder characterized by having a shape formed thereon. 2. The roller holder according to claim 1, wherein the pressing portion is formed so that a center position in an axial direction on an outer peripheral surface of the pressing portion is a mold cutting position.