JP5312243B2 - Cam follower and method for manufacturing cam follower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cam follower and a method for producing the cam follower, in which the size and cost of the cam follower are reduced using a high-strength cam follower stud with a fiber flow continuously formed over each part without causing fiber flow disconnection by cutting. <P>SOLUTION: The cam follower includes an outer ring 31 having an outside track surface 34 on the inner periphery, the cam follower stud 11 having an inside track surface 20 opposite to the outside track surface 34, in which a jaw portion 12 adjacent to one side of the inside track surface 20 and a side plate press-fit portion 17 and an attachment shaft portion 18, which are adjacent to the other side of the inside track surface 20, are formed in this order, and a fiber flow is continuously formed along the surface from the jaw portion 12 toward a track portion 16 in which the inside track surface 20 is formed in the outer periphery, a rolling element 32 arranged between the outside track surface 34 and the inside track surface 20, and an inside plate 33 which is press-fitted to the side plate press-fit portion 17 so as to restrict the axial movement of the outer ring 31 and the rolling element 32 in cooperation with the jaw portion 12. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cam follower and a method for manufacturing the cam follower.

  The cam follower is configured such that an outer ring having an outer raceway surface on the inner periphery is rotatably mounted on one end of a cam follower stud via a rolling element, and an outer ring supported in a cantilever manner by the cam follower stud is a track (track). ) It rolls over and is also called a track roller (Patent Documents 1 and 2).

  As shown in FIG. 15, the cam follower stud 1 includes a raceway portion 4 having an inner raceway surface facing an outer raceway surface of an outer ring, a flange portion 3 adjacent to one side of the inner raceway surface, A side plate press-fit portion 5 and a mounting shaft portion 6 which are adjacent to the other side of the raceway surface in this order are formed. The track portion 4, the side plate press-fitting portion 5 and the mounting shaft portion 6 are sequentially formed in a small diameter, and a step shape is formed between the track portion 4 and the side plate press-fit portion 5, and between the side plate press-fit portion 5 and the mounting shaft portion 6. ing. The mounting shaft portion 6 is divided into an insertion shaft portion 7 on the side plate press-fitting portion 5 side and a screw portion 8 on the distal end side. Rolling elements are arranged between the inner raceway surface of the raceway portion 4 and the outer raceway surface of the outer ring. A side plate facing the flange 3 is press-fitted and fixed to the side plate press-fitting portion 5, and the movement of the outer ring and the rolling element in the axial direction is restricted by the cooperation of the flange 3 and the side plate.

  The cam follower is fixed in a cantilever manner by inserting the mounting shaft portion 6 of the cam follower stud 1 into a housing of a mechanical device to be mounted and fastening a nut to a screw portion 8 protruding to the opposite surface of the housing. The rolling elements include a roller type with a cage and a full roller type that does not use a cage.

  The cam follower stud 1 is generally formed by cutting a metal bar material. And before the cutting process, it is known that a hexagonal hole is formed on the outer end surface of the flange portion serving as one end surface, and a center hole is processed on the outer end surface of the mounting shaft portion serving as the other end surface by forging ( Patent Document 2).

  Further, as an oil supply structure for the track portion, an axial oil supply hole extending from the center of the outer end surface of the mounting shaft portion of the cam follower stud to the center of the track portion is provided, communicated with the tip of the axial oil supply hole, and It is known to provide a radial oil supply hole that reaches the outer diameter surface of the raceway. A grease nipple is attached to the open end of the axial oil supply hole (see Patent Document 1 or 2).

Japanese Patent Laying-Open No. 2005-257036 (FIGS. 3, 4, and 9) Japanese Patent No. 3874479 (paragraph 0037)

  By the way, conventionally, the cam follower stud 1 is manufactured by cutting a metal bar obtained by cutting a metal wire into a required length.

  The metal structure of the metal rod is a fibrous structure in which many fibers are gathered, and the flow of the fibrous structure is called a fiber flow. For example, in a metal wire manufactured by drawing, a fibrous flow in the length direction, that is, a fiber flow appears in the length direction.

  When the metal rod having the fiber flow aligned in the length direction is cut from the outer peripheral surface to form the cam follower stud 1, as shown by a thin line in the schematic diagram of FIG. Will cause the fiber flow 2 to be cut.

  A portion of the flange portion 3 at one end portion of the cam follower stud 1 cut in this way is formed by sequentially cutting the fiber flow 2 from the outer periphery at the end surface on the track portion 4 side. Therefore, since the collar part 3 is arranged so that the eyes of the fiber flow 2 cut toward the end face are aligned, the collar part 3 is easily broken along the eyes of the cut fiber flow 2.

  In particular, in the case where the nussiness 9 that is recessed into the collar portion is formed at the root portion of the collar portion 3, there is a problem that the strength of the root portion becomes weaker.

  Further, in the raceway part 4, the side plate press-fitting part 5 and the mounting shaft part 6, since the fiber flow 2 in the outer peripheral part is cut by cutting, the outer peripheral part of each part is in the eyes of the fiber flow 2. It is easy to break along.

  For this reason, when the cam follower stud 1 is formed by cutting, the strength of the flange 3 and the outer peripheral portion of each part is weakened. Therefore, in order to obtain the cam follower stud 1 having a predetermined strength, the thickness and diameter are increased. As a result, there is a problem that the cam follower becomes larger and the cost increases.

  Therefore, the present invention realizes a compact cam follower and a low cost by obtaining a high strength cam follower stud having a fiber flow continuous over each part without cutting the fiber flow by cutting. Let it be an issue.

  In order to solve the above-described problems, the present invention provides an outer ring having an outer raceway surface on an inner periphery, an inner raceway surface facing the outer raceway surface, and a flange adjacent to one side of the inner raceway surface. A side plate press-fit portion and a mounting shaft portion that are adjacent to each other and the other side of the inner raceway surface are formed in order, and the fiber flow continues along the surface from the flange portion to the raceway portion where the inner raceway surface is formed on the outer periphery. A cam follower stud formed between the outer raceway surface and the inner raceway surface, and press-fitted into the side plate press-fitting portion and in cooperation with the flange portion, the outer ring and the rolling member A cam follower is constituted by a side plate that restricts movement in the axial direction.

  The track portion, the side plate press-fitting portion, and the attachment shaft portion are sequentially formed to have a small diameter, and step portions are formed between the track portion and the side plate press-fit portion and between the side plate press-fit portion and the attachment shaft portion, respectively.

  The base part of the said collar part is formed with the Nusumi recessed into the collar part.

  Further, the corners of the stepped portion formed between the inner raceway surface and the side plate press-fitting portion are provided with a radius.

  Further, a hexagonal hole having a center hole at the hole bottom is formed on the outer end surface of the flange portion, and a center hole is formed on the outer end surface of the mounting shaft portion.

  The mounting shaft portion is formed with an axial oiling hole extending from the tip surface of the mounting shaft portion to the track portion, and a radial oiling hole continuous with the axial oil supply hole and reaching the track surface of the track portion. The axial oil supply hole is formed at a position eccentric to the non-load region of the cam follower.

  The mounting shaft portion includes an insertion shaft portion on the side plate press-fitting side and a screw portion adjacent to the insertion shaft portion via a step portion in the axial direction, and gives a necessary taper to the step portion.

  In the cam follower according to the present invention, seal members are provided at both ends of the outer ring, one of the seal members is in sliding contact with the outer peripheral surface of the flange portion, and the other is in sliding contact with the outer peripheral surface of the side plate.

  The cam follower stud is set in a die having a cylindrical cavity that forms a metal bar having a fiber flow along the axial direction into a shape that forms the basis of the track portion, the side plate press-fitting portion, and the mounting shaft portion. A cold forging step in which a metal bar is pressed with a punch in a longitudinal direction to form a primary molded product having a shape serving as a base of the flange, and the outer peripheral surface of the primary molded product is ground to form the flange, It can manufacture by the manufacturing method including the grinding process process which shape | molds a part of the said track part, a side plate press-fit part, and the said side plate attaching part.

  A protruding die for forming a nudity is provided at a portion of the die that forms the root of the collar portion on the track portion side.

  Further, a required taper mold is formed at the step portion between the insertion shaft portion of the die and the portion to be the screw portion.

  The punch is provided with a forming cavity for forming the flange portion, and the metal rod material deformed by pressurization is poured into the forming cavity to form the shape of the flange portion.

  During the cold forging, a hexagonal hole having a center hole at the bottom of the hole and a center hole in the outer end surface of the mounting shaft can be formed on the outer end surface of the flange.

  After the cold forging step, a rolling step of forming a screw portion on the mounting shaft portion by rolling can be provided.

  In the cam follower stud manufactured as described above, the fiber flow is continuously formed along the surface from the flange portion to the track portion where the inner track surface is formed on the outer periphery.

  Therefore, if it has the same level of strength, the cam follower stud according to the present invention can be made smaller in shape than a cam follower stud formed by conventional cutting.

  As described above, the cam follower stud used in the cam follower of the present invention has a fiber flow continuously formed along the surface from the flange portion to the race portion where the inner race surface is formed on the outer periphery. There is no reduction in strength due to cutting.

  For this reason, the strength of the cam follower stud is improved, and the width and diameter can be reduced by that amount, and the cam follower stud can be made compact.

  Further, the cam follower using the cam follower stud can be made compact as a whole as the cam follower stud is made compact.

  By tapering the stepped portion, the stress concentration in this portion is alleviated and the strength of the cam follower stud is improved. The effect on the tightening torque applied when attaching to the mating member via the threaded portion was particularly great, and the stress applied to this location could be reduced by up to about 50%. It was also confirmed that the stress applied when a bending moment is generated in the cam follower stud when using a normal cam follower is also reduced.

It is sectional drawing which shows one Embodiment of the cam follower which concerns on this invention. It is a partially cutaway front view showing one embodiment of a cam follower stud used in the cam follower according to the present invention. 2A is a partially enlarged sectional view of FIG. 2, FIG. 2B is a partially sectional view of another part of FIG. 2, and FIG. 3C is a front view showing a part of the modification of FIG. . It is sectional drawing which represented typically the fiber flow of the primary molded product of the cam follower stud formed by cold forging. It is a partially notched front view of the primary molded product of the cam follower stud formed by cold forging. It is sectional drawing which shows the state which opened the punch of the metal mold | die which performs cold forging. It is sectional drawing which shows the state which set the metal bar to the die | dye of the metal mold | die which performs cold forging. It is sectional drawing which shows the state in the middle of performing cold forging by pressurizing with a punch. It is sectional drawing which shows the state at the time of pressurizing with a punch and finishing cold forging. It is sectional drawing which shows the state which forms a hexagonal hole with the hexagonal hole formation punch of a punch. It is sectional drawing which shows the state which opens a punch after cold forging and takes out the primary molded product of a cam follower stud with the knockout pin of die | dye. It is a partially notched front view in which a thread portion is formed by rolling on a primary molded product of a cam follower stud formed by cold forging. It is a partial front view which shows the state which forms the level | step difference of a side-plate press-fit part in the primary molded product of a cam follower stud with an angular cylindrical grinding wheel. It is a whole front view which shows the state which forms the level | step difference of a side-plate press-fit part in the primary molded product of a cam follower stud with an angular cylindrical grinding wheel. It is sectional drawing showing the fiber flow of the cam follower stud of the prior art example formed by cutting.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the cam follower according to the present invention includes an outer ring 31 having an outer raceway surface 34 on the inner periphery, and an inner raceway surface 20 facing the outer raceway surface 34, and one of the inner raceway surfaces 20. A side plate press-fit portion 17 and a mounting shaft portion 18 that are adjacent to each other on the other side of the flange portion 12 and the inner raceway surface 20 are formed in this order, and the inner raceway surface 20 is formed on the outer periphery from the flange portion 12. The cam follower stud 11 in which the fiber flow is continuously formed along the surface over the raceway portion 16, the rolling elements 32 arranged between the outer raceway surface 34 and the inner raceway surface 20, and the side plate press-fit portion. 17 and a side plate 33 that restricts the axial movement of the outer ring 31 and the rolling element 32 in cooperation with the flange 12.

  In the step portion 13 between the collar portion 12 and the raceway portion 16, a slug 27 is formed which is recessed in the collar portion 12 side (axial direction) at the corner portion on the raceway portion 16 side (FIG. 3A). reference). In the conventional case, the puss in this portion is recessed in the radial direction (see Nusmi 9 in FIG. 15), but in the case of this invention, it is processed by cold forging as will be described later. Therefore, it is necessary to be recessed in the die cutting direction (axial direction) during cold forging.

  In addition, the Nusumi 27 is provided in order to avoid the malfunction that the roller 32a (refer FIG. 3 (a)) contacts the corner part of the level | step-difference part 13 when the rolling element 32 is a full roller type.

  The track portion 16, the side plate press-fit portion 17, and the mounting shaft portion 18 are sequentially formed with a small diameter, and a step between the track portion 16 and the side plate press-fit portion 17 and a step between the side plate press-fit portion 17 and the mount shaft portion 18. Each part 15 is formed.

  As shown in FIG. 3 (b), the corner portion 28 of the step portion 14 formed between the inner raceway surface 20 and the side plate press-fitting portion 17 is provided with a round (R) and is notched due to a concentrated load. To prevent damage.

  A hexagonal hole 24 having a center hole 26 at the hole bottom is formed on the outer end surface of the flange portion 12. A center hole 25 is formed in the outer end surface of the mounting shaft portion 18.

  The mounting shaft portion 18 includes an insertion shaft portion 19 on the side plate press-fitting side, and a screw portion 21 adjacent to the insertion shaft portion 19 via a step portion 22 in the axial direction. Is granted.

  Seal members 36 are installed at both ends of the outer ring 31. One of the seal members 36 is in sliding contact with the outer peripheral surface 12 ′ of the flange portion 12, and the other is in sliding contact with the outer peripheral surface of the side plate 33. . The seal member 36 is attached to the recessed step portions 35 and 35 that are concentric with the outer raceway surface 34 formed on the inner peripheral surface of the outer ring 31 and have a larger diameter than the outer raceway surface 34.

  The flange portion 12 and the side plate 33 prevent the outer ring 31 and the rolling element 32 from moving in the axial direction, and the seal member 36 prevents leakage of the internal lubricating oil and prevents intrusion of dust from the outside. .

  The oil supply hole 37 provided in the cam follower stud 11 has an axial oil supply hole 39 reaching the center of the track portion 16 from the outer end surface on the screw portion 21 side, and a radial direction reaching the track surface 20 in communication with the tip portion. The inlet of the axial oil supply hole 39 is an oil supply port 38. A grease nipple is attached to the oil supply port 38 in use.

  A constant load direction (see the white arrow in FIG. 1) is defined on the outer ring 31 of the cam follower. For this reason, the cam follower stud 11 can be divided into a load region α and a non-load region β with reference to the center line thereof. However, the axial oil supply hole 39 has a constant distance r in the direction of the non-load region β from the center line. It is provided only at an eccentric position. Thereby, the strength of the cam follower stud 11 in the load region α is improved.

  In the case of FIG. 1, a case where the rollers as the rolling elements 32 are held by the cage 41 is shown, but a full roller type that does not use the cage 41 may be used. The roller in this case is indicated by reference numeral 32a in FIG.

  In addition, as a modified example of the cam follower stud 11, the screw portion 21 may be omitted and the cam follower stud 11 may be configured only by the insertion shaft portion 19. The chamfer 23 serves as a guide when the insertion shaft portion 19 is inserted into the mounting hole of the counterpart machine. It is fixed by press-fitting the insertion shaft portion 19 into the mounting hole. Further, a slot for engaging a flathead screwdriver may be formed instead of the hexagonal hole 24.

  Further, the seal member 36 may be omitted. In that case, the recessed step 35 is omitted. The oil supply hole 37 (the oil supply port 38, the axial oil supply hole 39, and the radial oil supply hole 40) may be omitted.

Next, the manufacturing method of the cam follower stud 11 used for the cam follower according to the present invention will be described.
The cam follower stud 11 used for the cam follower according to the present invention can be manufactured by the following steps.

[Forging process]
First, the primary molded product 11a of the cam follower stud shown in FIGS. 4 and 5 is formed by cold forging. The primary molded product 11a has a shape in which there is no step portion 15 between the side plate press-fitting portion 17 and the mounting shaft portion 18 of the cam follower stud 11, and the step portion 15 is formed by a grinding process described later.

  The cold forging step has a cylindrical cavity that forms the metal rod A in which the fiber flow is formed along the axial direction into a shape that becomes the basis of the track portion 16, the side plate press-fit portion 17, and the mounting shaft portion 18. It is a step of setting the die 50 and pressurizing with the punch 52 in the longitudinal direction of the metal bar A to form the primary molded product 11a having a shape that becomes the basis of the flange portion 12.

  When the metal rod A in which the fiber flow 30 continues along the axial direction is formed by cold forging in which pressure is formed at room temperature using the mold shown in FIG. 6, the fiber flow 30 is a schematic diagram of FIG. As shown in FIG. 4, the fiber flow 30 becomes dense at the step portions 13 and 14, and the fiber flow 30 continues along the surface from the flange portion 12 to the track portion 16 where the inner track surface 20 is formed on the outer periphery. It is formed.

  As shown in FIG. 6, the mold includes a die 50 including a raceway portion 16 of the cam follower stud 11 and a cylindrical molding cavity 51 of the mounting shaft portion 18, and a molding cavity 53 of the flange portion 12 on the lower surface. And punch 52. At the center of the die 50, a knockout pin 54 for pushing out the molded product from the die 50 is provided. A conical protrusion 59 that forms a center hole is provided on the upper surface of the knockout pin 54. Further, a guide hole 56 of a hexagonal hole forming punch 55 that forms the hexagonal hole 24 of the flange 12 is provided at the center of the punch 52.

  A projecting die 57 for forming a nose 27 at the base of the flange 12 is provided at the opening periphery of the molding cavity 51 of the die 50.

  Further, a taper 58 for forming the tapered step portion 22 is provided between the portion that becomes the mounting shaft portion 18 and the screw portion 21 in the portion where the mounting shaft portion 18 in the cavity 51 for forming the die 50 is formed. It has been.

  In order to form the primary molded product 11a of the cam follower stud 11 using the above mold, first, as shown in FIG. 7, with the punch 52 opened upward with respect to the die 50, the fiber flow in the axial direction is performed. Is set on the die 50. Next, the punch 52 is lowered and the metal rod A is moved along the shape of the molding cavity 51 in the die 50 and the molding cavity 53 of the punch 52 as shown in FIGS. The material A is plastically deformed.

Thereafter, as shown in FIG. 10, the hexagonal hole forming punch 55 of the punch 52 is press-fitted into the flange part 12, and the hexagonal hole 24 having a center hole at the bottom part is formed in the flange part 12.
In this way, after the primary molded product 11a of the cam follower stud 11 is formed by cold forging, as shown in FIG. 11, the hexagonal hole forming punch 55 is opened upward, and the knockout pin 54 of the die 50 is pushed up so that the primary The molded product 11a is taken out from the die 50.

  As the metal bar A, for example, case-hardened steel can be used, but it is not limited to this, and there is no particular designation as long as it does not impair the effects of the present invention.

  In the mold shown in FIGS. 6 to 11, the molding cavity 53 for the flange 12 is provided on the lower surface of the punch 52. However, a molding cavity for molding the flange 12 is formed on the die 50 side. A metal bar set on a die with a flat pressing surface may be press-formed.

  FIG. 4 is a drawing showing the fiber flow 30 appearing on the tissue surface of the cross section along the axial direction of the primary molded product 11a. Around the shaft core, the whole appears almost parallel and at the same density. This indicates that the influence of plastic deformation due to forging is small on the meat portion around the shaft core. On the other hand, in the portion close to the surface, there is a change in the flow of the fiber flow 30 and the density is high. It shows that plastic deformation due to forging has a strong influence on the portion close to the surface.

  When the fiber flow 30 in the portion close to the surface is viewed in detail, in the flange portion 12, the high-density fiber flow 30 flows from the periphery of the hexagonal hole 24 in the central portion along the outer surface of the flange portion 12 in the outer diameter direction. The bent portion 12 is bent in an inverted U shape without interruption from the tip of the collar portion 12. Moreover, although the flow of the center part of the thickness direction of the collar part 12 is relatively low density, it curves and bend | folds in the reverse U shape of a narrow space | interval without interruption.

  The high-density fiber flow 30 in the portion close to the outer surface of the collar portion 12 is curved in a state of being deformed at a higher density along the concave shape in the portion of the rod 27, and toward the track portion 16 without interruption. It is flowing while spreading.

  The fiber flow 30 of the flange 12 is bent in an inverted U shape without being interrupted, and the metal rod is pressed into the forming cavity 53 of the punch 52 by pressing the tip of the metal bar in the axial direction. This is presumably due to the fact that the flesh of the metal flows in the radially outward direction and is molded.

  Further, the reason why the fiber flow 30 has a higher density in the portion of the Nusumi 27 is that the molding portion is further compressed by being hit by the projecting die 57 of the die 50.

  The stepped portion 14 is also curved along the radius of the corner portion 28 and flows toward the mounting shaft portion 19 with a slightly higher density. Further, the tapered step portion 22 is gently inclined along this and flows toward the unprocessed portion 21a.

  At the front end of the unprocessed portion 21a, the flow of metal meat extending in the front end direction is formed by the conical protrusion 59 that forms the center hole 25 at the bottom, and the fiber flow 30 at the outer peripheral portion and the center are formed. The part of the fiber flow 30 is considered to be substantially U-shaped.

[Screw rolling process]
In the primary molded product 11 a molded as described above, the tip end side of the mounting shaft portion 18 is formed with a small diameter through the tapered step portion 22 by the taper 58 of the die 50. As shown in FIG. 12, a threaded portion 21 is formed by rolling the small diameter portion.

[Grinding process]
Next, as shown in FIG. 12, the primary molded product 11a on which the threaded portion 21 is formed is appropriately subjected to heat treatment such as carburizing treatment and induction hardening, and then angular cylindrical grinding as shown in FIGS. A stepped portion 15 of the side plate press-fitting portion 17 is formed using a machine to complete the cam follower stud 11 as shown in FIG.

  As shown in FIG. 13, the places where grinding is performed in this grinding step are the outer peripheral surface 12 ′ of the flange 12, the step portion 13 on the track portion 16 side of the flange portion 12, the inner track surface 20 of the track portion 16, and the step portion. 14, side plate press-fit portion 17, step 15, corner radius between side plate press-fit portion 17 and step 15 (R size: R 0.1-0.3 mm), insertion shaft portion 19 of mounting shaft portion 18, The peripheral surface of the cylindrical grindstone 60 has a shape corresponding to this grinding location.

  As shown in FIG. 14, the angular cylindrical grindstone 60 has a peripheral grinding surface inclined at a predetermined angle with respect to the grindstone shaft 60a. As shown by white arrows in FIGS. By pressing diagonally against the molded product 11a, grinding in the shaft, diameter, and both directions can be performed in one step.

  In FIG. 14, the code | symbol 61 has shown the turning unit of the cylindrical grindstone 60, and 62 has shown the turning axis. Moreover, in FIG. 13, FIG. 14, the code | symbol 63 has shown the support shaft of the primary molded product 11a.

  The width of the side plate press-fitting portion 17 formed in the grinding process is slightly smaller than the width of the flange portion 12, and the insertion shaft portion 19 is formed equal to the thickness of the housing of the device to be attached. . The step portion 15 of the side plate press-fitting portion 17 is a minute one corresponding to the press-fitting allowance of the side plate 33 (see FIG. 1) to be press-fitted here. The taper is applied to the stepped portion 22 in order to relieve stress, and when the mounting shaft portion 18 is inserted into the mounting hole of the machine, it is possible to prevent a problem of being caught in the mounting hole and smoothly insert it. It is for doing so.

  A hexagonal hole 24 is provided in the central portion of the end surface of the flange portion 12, and a shallow center hole 25 is provided in the central portion of the distal end surface of the mounting shaft portion 18. The hexagonal hole 24 is a hole into which a hexagon wrench is inserted in order to prevent co-rotation when a nut is tightened on the screw portion 21. A center hole 26 is formed at the bottom of the hexagonal hole 24, and is rotatably supported by an angular cylindrical grinder by a support shaft 63 with the other center hole 25 during grinding, as shown in FIGS. . A groove for inserting a flathead screwdriver may be provided instead of the hexagonal hole 24. In this case, the center hole 26 is provided in the groove.

DESCRIPTION OF SYMBOLS 11 Cam follower stud 11a Primary molded article 12 Gutter part 12 'Outer peripheral surface 13 Step part 14 Step part 15 Step part 16 Track part 17 Side plate press-fit part 18 Mounting shaft part 19 Insertion shaft part 20 Inner raceway surface 21 Thread part 21a Unprocessed part 22 Step part 23 Chamfer 24 Hexagon hole 25 Center hole 26 Center hole 27 Nusumi 28 Corner part 30 Fiber flow 31 Outer ring 32 Rolling element 32a Roller 33 Side plate 34 Outer raceway surface 35 Recessed step part 36 Seal member 37 Oil supply hole 38 Oil supply port 39 Shaft Directional lubrication hole 40 Radial direction lubrication hole 41 Cage 50 Die 51 Molding cavity 52 Punch 53 Molding cavity 54 Knockout pin 55 Hexagonal hole forming punch 56 Guide hole 57 Projection die 58 Taper 59 Projection 60 Cylindrical grindstone 60a Grinding wheel shaft 61 Swivel unit 62 Swivel axis 63 Support axis

Claims (13)

An outer ring having an outer raceway surface on the inner periphery;
An inner raceway surface facing the outer raceway surface is formed, and a flange portion adjacent to one side of the inner raceway surface and a side plate press-fit portion and a mounting shaft portion adjacent to the other side of the inner raceway surface are formed in this order. A cam follower stud in which a fiber flow is continuously formed along the surface from the flange portion to the track portion where the inner track surface is formed on the outer periphery;
Rolling elements arranged between the outer raceway surface and the inner raceway surface;
A side plate that is press-fitted into the side plate press-fitting portion, and that restricts axial movement of the outer ring and the rolling element in cooperation with the flange portion;
Cam follower with.   The cam follower according to claim 1, wherein a Nusumi recessed into the collar is formed at a base portion of the collar.   The cam follower according to claim 1 or 2, wherein a rounded portion is provided at a corner of a step portion formed between the inner raceway surface and the side plate press-fitting portion.   The cam follower according to any one of claims 1 to 3, wherein a hexagonal hole having a center hole at the bottom of the hole is formed on the outer end surface of the flange portion, and a center hole is formed on the outer end surface of the mounting shaft portion. .   An axial oiling hole extending from the tip surface of the mounting shaft part to the track part, and a radial oiling hole continuing to the axial oiling hole and reaching the track surface of the track part are formed. The cam follower according to any one of claims 1 to 4, wherein the hole is formed at a position eccentric to a non-load region of the cam follower. The mounting shaft portion includes an insertion shaft portion on the side plate press-fitting side and a screw portion adjacent to the insertion shaft portion via a step portion in the axial direction, and the diameter of the step portion decreases toward the screw portion. The cam follower according to any one of claims 1 to 5, wherein a taper is provided.   The sealing member is installed at both ends of the outer ring, and one of the sealing members is in sliding contact with the outer peripheral surface of the flange, and the other is in sliding contact with the outer peripheral surface of the side plate. The cam follower according to any one of 6. A method for producing a cam follower according to any one of claims 1 to 7,
The cam follower stud is set in a die having a cylindrical cavity that forms a metal bar having a fiber flow along the axial direction into a shape that forms the basis of the track portion, the side plate press-fitting portion, and the mounting shaft portion. A cold forging step in which a metal bar is pressed with a punch in a longitudinal direction to form a primary molded product having a shape serving as a base of the flange, and the outer peripheral surface of the primary molded product is ground to form the flange, A method of manufacturing a cam follower, wherein the track follower, the side plate press-fitting portion, and a grinding process for forming a part of the side plate attachment portion are manufactured.   The cam follower manufacturing method according to claim 8, wherein a projecting die for forming a nudity is provided at a portion of the die that forms a root of the flange portion on the track portion side. The taper type | mold with which a diameter becomes small toward a screw part is formed in the said level | step-difference part between the part used as the said insertion shaft part of the said die | dye, and the said screw part, The Claim 8 or 9 characterized by the above-mentioned. Cam follower manufacturing method.   The punch has a forming cavity for forming the flange, and the meat of the metal bar deformed by pressurization is poured into the forming cavity to form the shape of the flange. The manufacturing method of the cam follower in any one of 9 thru | or 10.   The hexagonal hole which has a center hole in the hole bottom in the said collar part outer end surface in the case of the said cold forging, and a center hole is formed in the said attaching shaft part outer end surface, Any of Claim 9 thru | or 11 characterized by the above-mentioned. A method for producing the cam follower according to claim 1. The method for manufacturing a cam follower according to any one of claims 9 to 12, further comprising a rolling step of forming a screw portion on the mounting shaft portion by rolling after the cold forging step.