JPH1163165A - Loading cam device holder and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing costs for a loading cam device holder and to stabilize an operation by making the holder of a metal plate and arranging projecting parts protruded in both sides of the metal plate in the inner edge side of each pocket to be along the gaps of first and second cam faces in a circumferential direction. SOLUTION: A holder 11a constituting a loading cam device is formed in a roughly circular ring shape as a whole by plastic-machining a metal plate, and rectangular pockets 15 are formed in a plurality of places in a circumferential direction. In a plurality of circular-arc plate parts 17 located in the inner diameter side of each pocket 15, projecting parts 18 protruded in both sides of the metal plate roughly on the full length are formed by plastic-machining the metal plate. In the case of the loading cam device having the holder 11a, even if a first cam surface and a second cam surface are largely separated from each other, because of the existence of the projecting parts 18 in both sides opposite both cam surfaces, the position of the holder 11a is prevented from being shifted from both cam surfaces and a middle part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The loading cam device according to the present invention is used by being incorporated in a toroidal-type continuously variable transmission used as, for example, an automobile transmission. The present invention relates to a retainer that is a component of such a loading cam device and a method for manufacturing the same.

[0002]

2. Description of the Related Art The use of a toroidal type continuously variable transmission as schematically shown in FIG. 10 has been studied, for example, as an automobile transmission. The basic structure of this toroidal type continuously variable transmission is disclosed in Japanese Utility Model Laid-Open Publication No. Sho 62-71465, and the like. The input disk 2 supported at the end of a torque input shaft 1 and the end of an output shaft 3 are provided. Power rollers 6, 6 rotatably supported by displacement shafts 5, 5 whose tilt angles can be adjusted, are sandwiched between the output rollers 4 mounted on the power rollers 6 and 6.

The inner surfaces 2a and 4a of the input disk 2 and the output disk 4 which face each other are concave curved surfaces each having an arc shape rotated around a torque input shaft. Each power roller 6, 6
Peripheral surfaces 6a, 6a are in contact with each other. A loading cam device 7 is mounted between the torque input shaft 1 and the input disk 2 as a pressing device for rotating the input disk 2 while pressing the input disk 2 toward the output disk 4 in the axial direction. The loading cam device 7 has a first surface (right surface in FIG. 10) of a cam disk 8 which engages with the torque input shaft 1 and rotates together with the torque input shaft 1. , A second cam surface 10 formed on the outer surface of the input disk 2 (surface on the left side in FIG. 10) as irregularities extending in the circumferential direction, and a ring-shaped retainer 11. A plurality of rollers 12, 12 held between the first cam surface 9 and the second cam surface 10 while being movably held.
And

[0004] The rollers 12 are disclosed in, for example, Japanese Patent Application Laid-Open No. 1-29935.
No. 8 is used. The roller 12 described in this publication is composed of an element 14 having a narrow width in which a small-diameter projection 13 is formed at the center of one end face as shown in FIG. (In this example, three stations). The rollers 12 formed by combining a plurality of such elements 14 are used in a state where they are rollably held inside rectangular pockets 15 formed at a plurality of positions in the circumferential direction of the retainer 11. In this case, since the elements 14 can roll independently of each other, a speed difference between the inner peripheral side and the outer peripheral side is absorbed.

In the case of a toroidal type continuously variable transmission incorporating the loading cam device 7 configured as described above, when the cam disk 8 is rotated by the torque input shaft 1, the first cam surface 9 is moved to a plurality of rollers 12. Is pressed against the second cam surface 10. As a result, the input disk 2 is pressed toward the output disk 4, and the inner surfaces 2a, 4a of the disks 2, 4 and the peripheral surfaces 6a, 6a of the power rollers 6, 6 come into strong contact. Therefore, when the input disk 2 is rotated based on the pressing between the rollers 12 and the convex portion of the second cam surface 10, the rotational force is transmitted to the output disk 4 via the power rollers 6, 6, and The output shaft 3 to which the disk 4 is fixed rotates in the opposite direction to the torque input shaft 1. Note that lubricating oil is supplied to each contact point between the first cam surface 9 and the second cam surface 10 or 12 in order to prevent seizure during pressing.

When the torque is transmitted from the torque input shaft 1 to the output shaft 3 in this manner, the peripheral surfaces 6a of the power rollers 6, 6 are formed on the inner surface 2a of the input disk 2 as shown in FIG. When the displacement shafts 5 and 5 are tilted so as to abut against the portion from the outer periphery of the shaft and the portion from the center of the inner surface 4a of the output disk 4, respectively, the speed increase between the torque input shaft 1 and the output shaft 3 is increased. Done. Conversely, each power roller 6, 6
When the displacement shafts 5, 5 are inclined such that the peripheral surfaces 6a, 6a of the input disk 2 abut on the inner surface 2a of the input disk 2 and the outer surface of the inner surface 4a of the output disk 4, respectively, the torque is increased. The deceleration is performed between the input shaft 1 and the output shaft 3. According to the above principle, if the inclination angles of the displacement shafts 5 and 5 are adjusted to appropriate values, the torque input shaft 1 and the output shaft 3 can be adjusted.
An arbitrary speed ratio can be obtained between and.

When the loading cam device 7 constructed and operating as described above is used in a toroidal type continuously variable transmission, it is necessary to improve the following points. When the loading cam device 7 is not operated, that is, when the rotational motion is not transmitted from the cam disk 8 to the input disk 2, the first cam surface 9 and the second cam surface 10 are separated as shown in FIG. Since the cages 11 are close to each other, the cage 11 is not significantly displaced in the thickness direction (vertical direction in FIG. 13). Therefore,
In this case, the rollers 12, 12 held in the respective pockets 15, 15 of the retainer 11 do not move vertically. On the other hand, when the loading cam device 7 is operated, that is, when the rotational motion is transmitted from the cam disk 8 to the input disk 2, as shown in FIG.
And the second cam surface 10 tend to separate from each other. As a result, since the cage 11 may be greatly displaced in the thickness direction, the rollers 12, 12 held in the pockets 15, 15 can easily fall out of the pockets 15, 15. Such a tendency does not cause any particular problem in a state where the fluctuation of the torque transmitted through the loading cam device 7 is small, but when a large torque is suddenly applied to the cam disk 8, the first cam Appears remarkably as a temporary increase in the distance between the surface 9 and the second cam surface 10,
The rollers 12, 12 may protrude from the pockets 15, 15 greatly.

When the rollers 12, 12 protrude greatly from the pockets 15, 15, the rolling surfaces 12a of the rollers 12, 12
12a have pockets 15, 15 with edges 15a, 1 respectively.
Since 5a hits, the durability of the rolling surfaces 12a, 12a may be significantly impaired by repetition. Also, when the rollers 12, 12 protrude greatly from the pockets 15, 15, the first cam surface 9 and the second cam surface 10
However, since the lubrication between the rolling surfaces 12a and 12a is uneven, the risk of seizure of the loading cam device also increases. Further, when the projections 13, 13 are formed on the end faces of the elements 14, 14, which constitute the rollers 12, 12, these projections 13, 13 and the edges of the pockets 15, 15 are fixed by meshing or the like. In this case, the first cam surface 9 and the second cam surface 10
The rollers 12, 12 will no longer fit in the pockets 15, 15 even if they attempt to return to the normal distance.

As a solution to the above inconvenience, for example, Japanese Unexamined Utility Model Publication No. 5-75551 discloses a loading cam device 7 'having a structure as shown in FIG. In this device, a substantially annular retainer 11 sandwiched between a first cam surface 9 and a second cam surface 10 is provided.
By crimping both ends of the openings of the pockets 15, 15 formed inside the pockets 15, 15, eave-shaped guides 16, 16 are formed. At this time, the width w of the opening of each pocket 15, 15, which is the distance between the edges of the guides 16, 16 formed opposite to each other, is set in the rollers 12, 12. Is made smaller than the outer diameter dimension D. In addition, the width dimension W of the middle portion in the thickness direction of each pocket 15 sandwiched between the front and back guides 16 is made larger than the outer diameter dimension D of the rollers 12. That is, w, D, and W
Guides 16 and 16 so that
Is formed.

[0010]

W <D <W In the loading cam device 7 'configured as described above,
Since the width dimension w of the opening of each pocket 15 is smaller than the outer diameter dimension D of the roller 12, each roller 12 cannot escape from the inside of each pocket 15. Therefore, in the toroidal-type continuously variable transmission incorporating the loading cam device 7 ', the rotational force is applied between the cam disk 8 having the first cam surface 9 and the input disk 2 having the second cam surface 10. When a large torque is suddenly applied to the cam disk 8 when the first cam surface 9 and the second cam surface 10 are largely separated from each other as shown in FIG. The vessel 11 has these two cam surfaces 9 and 10
Are held at a substantially intermediate position, and each roller 12 is
Does not protrude greatly from each pocket 15.

As a result, the edge of the pocket 15 does not hit the rolling surface 12a of the roller 12. Also, there is no uneven lubrication between the first cam surface 9 and the second cam surface 10 and the rolling surfaces 12a, 12a of the 12,12. Further, the elements 14, 1 constituting each roller 12, 12,
The engagement between the projections 13 and 13 formed on the end face of the pocket 4 and the edge of the pocket 15 does not occur.
It does not happen that the 2 does not fit inside the pockets 15, 15.

Although not shown here, the following Japanese Patent Application Laid-Open No. 5-75551 discloses the following structure in addition to the structure shown in FIG.

A structure in which holding springs are attached to both ends of the front and back openings of each pocket to prevent the rollers from falling out of each pocket.

[0014] A structure in which the front and back surfaces of the retainer have irregularities substantially matching the shapes of the first cam surface and the second cam surface, and the thickness dimension of the retainer is increased near each pocket.

On both the front and back surfaces of the cage, projections are formed at positions where the pocket is sandwiched from both sides in the circumferential direction or at positions where the pocket is sandwiched from both sides in the diametric direction so as not to interfere with the cam surface. Thus, the thickness of the cage in the vicinity of the pocket was slightly smaller than the outer diameter of the roller, and the thickness of the portion away from each pocket was sufficiently smaller than the thickness in the vicinity. Construction.

On both front and back surfaces of the retainer, a leaf spring is provided between the intermediate portion of the adjacent pocket and the first cam surface and the second cam surface, and the retainer is moved by the leaf spring to the first cam surface or the second cam surface. A structure for pressing in a direction away from the second cam surface.

In each of the above structures (1) and (2), even when the first cam surface 9 and the second cam surface 10 are largely separated from each other, the retainer 11 can move both the cam surfaces 9 and 9 similarly to the structure shown in FIG.
And 10 are held in a substantially intermediate position. For this reason, the roller 12 does not protrude greatly from the pocket 15 of the cage 7, and the edge of the pocket 15 does not hit the rolling surface of the roller 12. In addition, the rollers 12 and the cam surfaces 9, 1
There is no lubrication bias between zero. In addition, roller 1
Even if the projections are provided in 2, the rollers 12 will not be stuck inside the pockets 15.

When the retainer 11 is made of a metal plate, as shown in FIGS. 1 to 7 of Japanese Patent Application No. 7-7377, between the pockets 15 adjacent in the circumferential direction. A first protruding portion that protrudes at least on one side of the metal plate on a part of the plurality of plate portions existing in the first portion, and a first protruding portion that protrudes on at least the other surface side of the metal plate on the remaining plate portions. A structure in which the two protrusions are formed by pressing a metal plate, and the first protrusion and the second protrusion are substantially uniformly arranged in the circumferential direction. By doing so, the processing of the retainer 11 is simplified, and the manufacturing cost of the loading cam device can be reduced.

[0019]

SUMMARY OF THE INVENTION
The device described in Japanese Patent No. 75551 can effectively prevent the roller from slipping out of the pocket, but takes a lot of time to process the retainer (in the case of the structure shown in FIG. 15), or applies a spring to the retainer. The mounting work complicates the assembling work (in the case of the above structure), which causes an increase in the manufacturing cost of the loading cam device.

Further, the device described in Japanese Patent Application No. 7-7377 is simple and inexpensive to manufacture and assemble the cage, but when the distance between the opposing cam surfaces increases during operation. In addition, since there is room for the retainer to play against the cam surface, the retainer can move in the thickness direction. As a result, when the rollers 12 come out of the pockets 15, the pockets 1 are formed on the rolling surfaces 12 a of the rollers 12.
5, and the durability of the rolling surface 12a may be significantly impaired. In addition, there is a gap in lubrication between the first cam surface 9 and the second cam surface 10 and at positions 12 and 12 (FIG. 16). In FIG. 16, reference numeral 18a denotes a first protrusion, and 18b denotes a second protrusion.

The present invention has been made under the circumstances described above, and an object of the present invention is to reduce the manufacturing cost and stabilize the operation of a loading cam device retainer and a method of manufacturing the same. Is to provide.

[0022]

SUMMARY OF THE INVENTION The present invention is directed to a first cam surface formed as circumferential irregularities, and a first cam surface formed as circumferential irregularities, and is formed on the first cam surface in the axial direction. A second cam surface facing across, a ring-shaped retainer mounted between the first cam surface and the second cam surface, and pockets formed at a plurality of circumferential positions of the retainer And a plurality of rolling elements abutting on the first cam surface and the second cam surface while being rotatably held inside each of the pockets. The above object of the present invention is to form the retainer from a metal plate, and form a protrusion protruding on both sides of the metal plate on the inner edge side of each pocket by subjecting the metal plate to plastic working. Of the first cam surface and the second cam surface in the circumferential direction. It is achieved by placing along. Further, by forming the metal plate locally by plastic working to create a protrusion,
A cage can be manufactured.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS By incorporating the loading cam device of the present invention configured as described above into a toroidal-type continuously variable transmission, the input disk can be pressed in the axial direction.
The operation itself when transmitting the rotational motion from the torque input shaft to the input disk is possible in the same manner as in the case of the above-described loading cam device incorporated in the conventional toroidal-type continuously variable transmission. Moreover, in the case of the loading cam device of the present invention, even when the first cam surface and the second cam surface are largely separated from each other, the position of the cage is determined based on the presence of the protrusions on both sides of the cage with respect to these two cam surfaces. Are held without being shifted from the central portions of these two cam surfaces. Therefore, the rolling element does not completely come out of the pocket of the cage, and the edge of the pocket does not hit the rolling surface of the rolling element. Also, there is no uneven lubrication between the rolling element and each cam surface. Furthermore, even if the rolling element is provided with a projection, the rolling element will not be stuck inside the pocket.

[0024]

1 to 5 show an embodiment of a loading cam device according to the present invention. The present invention is intended to prevent the rollers 12 as rolling elements from completely coming out of the pockets 15 of the retainer even when the first cam surface 9 and the second cam surface 10 are largely separated from each other. The configuration of the retainer is characteristic, and the configuration and operation of the other parts are the same as those of the above-described conventional loading cam device, so that illustration and description are omitted.

The retainer 11a constituting the loading cam device of the present invention is made of a metal plate such as a mild steel plate or an aluminum alloy. This metal plate as a material has a thickness t (t = D / 4 to D / 3) of 1/4 to 1/3 of the diameter D of the roller 12 as a rolling element to be held. The retainer 11a is formed in a substantially circular shape by plastically processing such a metal plate, and has rectangular pockets 15 at a plurality of positions (four in the illustrated embodiment) in the circumferential direction.
Is formed. Rollers 12 each of which is a rolling element are rotatably held inside each of the pockets 15.

A plurality of (four in the illustrated embodiment) plate portions 17 present on the inner diameter side of each pocket 15 and each having an arc shape are provided on both sides of the metal plate (see FIG. 1) over substantially the entire length thereof. The protruding portions 18 protruding on the front side and the back side (upper and lower sides in FIG. 2) are formed by performing plastic working on the metal plate. The protrusion amount t 'of each of the protrusions 18 is substantially the same as the thickness t of the metal plate (t = t'). Therefore, the total thickness T of the retainer 11a, which is the distance from the leading edge to the other edge of the projecting portion 18, is obtained by doubling the projecting amount t 'as expressed by the following equation (2). This is the sum with the thickness t.

[0027]

## EQU2 ## T = t + 2t '

Such a retainer 11a is formed by the following first to fourth steps, all of which are performed by plastic working. (1) First Step (Roughing Step) FIGS. 6 and 7 show the workpiece shape in the first step. In the first step, a metal plate as a raw material is pressed between a male die and a female die, and a ring-shaped cage 11b is punched out. The inner and outer diameters of the punched retainer 11b are adjusted to the respective dimensions of the completed retainer 11a, but the four pocket portions 15 are provided on the inner peripheral side by a volume corresponding to the protrusion 18. Make it overhanging shape. That is, the overhang portion 21 is provided on the inner peripheral side. FIG.
And the shape shown by the two-dot chain line in FIG.
The outline of 1a is shown. (2) Second Step (Slit Rolling Step) FIG. 8 is a view showing the working principle of slit rolling, wherein the left half in the figure shows a state before molding and the right half shows a state after molding.
In the second step, a slit rolling roller 24 having a sharp projection along the circumference of the forming portion is used, and slit rolling is performed on four inner peripheral edges of the retainer 11b punched in the first step. A portion corresponding to the protrusion 18 is formed. That is, while rotating the retainer 11b punched in the first step while being sandwiched by the work supporting plates 23 and 23 ', the rotating slit rolling roll 24 arranged on the inner circle of the retainer 11b is rotated. By pushing it outward (in the Z direction in the figure), the tip of the overhang portion 21 is cut open toward both sides of the retainer 11b to form an overhang piece 19. (3) Third Step (Span Rolling Step) FIG. 9 is a view showing the working principle of flat rolling, wherein the left half in the figure shows a state before molding and the right half shows a state after molding. In the third step, a flat rolling roller 25 having a cylindrical processing surface along the circumference of the forming portion is used, and flattening is performed on four inner peripheral edges of the cage 11b slit-rolled in the second step. The protrusion 18 is formed by molding. That is, while the retainer 11b slit-rolled in the second step is rotated while being held between the work supporting plates 23 and 23 'in the same manner as in the second step, the retainer 11b is arranged on the inner circle of the retainer 11b and rotated. By pushing the flat rolling roll 25 toward the outside of the retainer 11b (the Z direction in the drawing), the projecting pieces 19 are raised toward both sides of the retainer 11b to form the protruding portions 18. The shape shown by the two-dot chain line in the right half of FIG. (4) Fourth Step (Pocket Removal Step) In the fourth step, a punching process and a shaving process are performed between another male mold and a female mold on the cage 11b formed by flat rolling in the third step. Processing is performed to form 15 pockets. Thereby, the inner dimensions of each pocket 15 are finished to a predetermined value.

In the case of the loading cam device of the present invention having the retainer 11a manufactured through the first to fourth steps as described above, the first cam surface 9 and the second cam surface 10 are large. Even when they are separated from each other, the retainer 11
The position "a" does not deviate from the intermediate portion between these cam surfaces 9 and 10. That is, in a state where the retainer 11a is incorporated in the loading cam device, and the rollers 12 held in the pockets 15 of the retainer 11a are aligned with the concave portions of the cam surfaces 9 and 10, the leading edge of the projecting portion 18 is 1
In each surface of 1a, the concave portion of the first cam surface 9 and the concave portion of the second cam surface 10 are respectively opposed. Therefore, although the retainer 11a is formed of a metal plate having a thickness t, it is as if the thickness is T (= t + 2t ').
The displacement in the axial direction (the front and back direction in FIG. 1 and the vertical direction in FIGS. 2, 4 and 5) is limited as if formed by the metal plate of FIG.

Therefore, the rollers 12 do not fall out of the pockets 15 of the retainer 11a, and the edge 15a of the pockets 15 does not hit the rolling surface 12a of the rollers 12.
In addition, the rollers 12, the first cam surface 9 and the second cam surface 10
The deviation in lubrication between the two is also significantly reduced. In addition, roller 1
Even if the projections 13 as shown in FIG. 11 are provided on the pockets 2 and 12, the projections 13 do not mesh with the edges 15 a and 15 a of the pockets 15, so that the rollers 12 do not fit inside the pockets 15. . In particular, in the case of the loading cam device of the present invention, the pocket 15 and the projection 1
8 can be formed only by the simple press working and rolling working consisting of the above-described first to fourth steps. Therefore, it is possible to reduce the manufacturing cost of the cage 11a alone and the entire loading cam device incorporating the cage 11a.

As is clear from the above description, instead of forming the projection 18 as in the present invention, the retainer 11
The displacement of the retainer 11a in the axial direction can also be limited by increasing the thickness t of the metal plate constituting a, and the roller 12 can be prevented from coming out of the pocket 15 of the retainer 11a. However, when the thickness t of the metal plate is increased, a larger force is required for punching the pocket 15, and a large press machine must be used. For this reason, in addition to an increase in equipment costs, a material cost of the metal plate itself also increases, so that an increase in manufacturing cost is inevitable. Further, an increase in the weight of the retainer 11a not only causes an increase in the weight of the toroidal-type continuously variable transmission, but also causes an increase in the moment of inertia and a decrease in rotational performance. The transmission efficiency of the entire transmission deteriorates. In the present invention, since the structure in which the protruding portions 18 are formed on both surfaces of the relatively thin metal plate is adopted, the above-described problems in cost and weight do not occur.

The gist of the present invention is not limited to the contents of the specific embodiment described above. For example, the roller 12 as a rolling element may not have the protrusion 13. The same applies to a case where the rolling element is a change ball of the roller 12 and grooves for rolling the ball are formed on the first cam surface 9 and the second cam surface 10. Act on.

[0033]

Since the loading cam device of the present invention is constructed and operated as described above, it is possible to reliably prevent a malfunction caused by a rolling element coming out of a pocket of a cage, and to provide a toroidal type continuously variable transmission. The operation of the machine can be stabilized. Further, since a lightweight cage can be obtained by easy processing, there is an advantage that a toroidal type continuously variable transmission having high performance can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a plan view of a cage showing one embodiment of the present invention.

FIG. 2 is a sectional view of the retainer shown in FIG.

FIG. 3 is a perspective view of the retainer shown in FIG.

FIG. 4 is a circumferential sectional view of a part of the loading cam device showing a use state of the embodiment of the present invention.

FIG. 5 is a sectional view similar to FIG. 4, showing a state during operation of the embodiment of the present invention.

FIG. 6 is a plan view of a holder blank used in the embodiment of the present invention.

FIG. 7 is a cross-sectional view of the blank of the cage shown in FIG. 6, taken along line BB.

FIG. 8 is a diagram for explaining the processing principle of slit rolling for producing the cage of the present invention from a blank.

FIG. 9 is a view for explaining the working principle of flat rolling for producing the cage of the present invention from a slit-rolled blank.

FIG. 10 is a side view showing a basic configuration of the toroidal-type continuously variable transmission in a state of maximum speed increase.

FIG. 11 is a front view showing elements constituting the rollers.

FIG. 12 is a front view showing a state in which rollers are held by a holder.

FIG. 13 shows a non-operating state of the loading cam device in which the retainer in which the prevention of bias is not taken into consideration is incorporated.
It is sectional drawing similar to.

FIG. 14 is a sectional view similar to FIG. 4, showing a state when the loading cam device of FIG. 13 is operated.

FIG. 15 is a view showing a non-operating state of a conventional loading cam device incorporating a retainer in consideration of prevention of bias.
It is sectional drawing similar to.

FIG. 16 is a diagram illustrating a state of a problem that occurs in the device described in Japanese Patent Application No. 7-7377.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque input shaft 2 Input disk 2a, 4a inner surface 3 Output shaft 4 Output disk 5 Displacement shaft 6 Power roller 6a Peripheral surface 7, 7 'Loading cam device 8 Cam disk 9 First cam surface 10 Second cam surface 11 , 11a, 11b Cage 12 Roller 12a Rolling surface 13 Projection 14 Element 15 Pocket 15a Edge 16 Guide 17 Plate 18 Projection 18a First projection 18b Second projection 19 Overhang piece 20 Processing reference hole 21 Overhang Part 23, 23 'Work support plate 24 Slit roll roll 25 Flat roll roll

Claims (2)

[Claims] 1. A first cam surface formed as circumferential irregularities and a second cam formed as circumferential irregularities and facing the first cam surface in the axial direction. Surface, a ring-shaped retainer mounted between the first cam surface and the second cam surface, pockets formed at a plurality of circumferential positions of the retainer, and inside each of the pockets. In a loading cam device comprising a plurality of rolling elements abutting on the first cam surface and the second cam surface while being held in a freely rotatable manner, the retainer is made of a metal plate. Protrusions projecting from both sides of the metal plate on the inner edge side of the pocket are formed by performing plastic working on the metal plate, and the protrusions are formed on the first cam surface and circumferentially. Characterized in that it is arranged along the gap of the second cam surface. Cage of swing cam device. 2. A method for manufacturing a retainer of a loading cam device, wherein the metal plate according to claim 1 is locally formed by plastic working to create the protrusion.