JP2011117606A - Manufacturing method for seal ring of shell-type needle roller bearing with seal ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for seal rings of a shell-type needle roller bearing with a seal ring which can easily be assembled by dispensing with direction property of the bearing and control an amount of penetrated lubricant at an approximately equal level in spite of flow directions of the lubricant. <P>SOLUTION: The shell-type needle roller bearing 30 with a seal ring includes a shell 31 having a raceway 31a on the inner peripheral surface and a pair of inward flange sections 31b, 31b on both ends, respectively, a retainer 32 having a plurality of pockets 32a in the circumference, a plurality of needle rollers 33 retained in respective pockets 32a to be freely rotatable along the raceway 31a, and a pair of seal rings 34, 34 with a cylindrical shape arranged between both end faces 32b, 32b of the retainer 32 in the axial direction and the pair of inward flange sections 31b, 31b inside the shell 31. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a seal ring of a shell type needle bearing with a seal ring.

  Conventionally, many slide bearings (bushes) are used in automatic transmissions, but shell type needle bearings are being substituted for measures against seizure of bushes and lower torque.

  When replacing a bush with a shell type needle bearing, there is known a structure in which a seal ring is incorporated in a shell type needle bearing so that the amount of lubricant penetrating oil is the same level as the bush (for example, Patent Documents 1 to 3). reference).

  Specifically, as shown in FIG. 10, in the shell type needle bearing 100, a plurality of needles 103 guided by the cage 102 are arranged in the shell 101, and the flange portion 101 a of the shell 101 and the cage 102 are arranged. A seal ring 104 for controlling the amount of oil penetrating is provided between the end face and the end face.

JP-A-6-294418 JP 2000-291669 A Japanese Utility Model Publication No.6-23776

  By the way, in the shell type needle bearing 100 illustrated in FIG. 10, the seal ring 104 is incorporated only on one side of the bearing 100, so that the bearing is directional. For this reason, it is necessary to confirm the direction of the bearing when the shell type needle bearing 100 is assembled into the housing. Further, as shown in FIG. 11, there is a problem that a large difference occurs in the amount of penetrating oil between the case where the lubricating oil flows from the direction of arrow A in FIG. 10 and the case where the lubricating oil flows from the direction of arrow B. is there.

  The present invention has been made in view of the circumstances as described above. The purpose of the present invention is to eliminate the directionality of the bearing, so that the assembly is easy and the amount of through oil regardless of the direction in which the lubricating oil flows. It is an object of the present invention to provide a method for manufacturing a seal ring of a shell-type needle bearing with a seal ring that can control the pressure approximately equally.

(1) A shell having a raceway surface on an inner peripheral surface or an outer peripheral surface and a pair of flange portions at both ends, a cage having a plurality of pockets in the circumferential direction, and along the raceway surface A plurality of needles held in the respective pockets so as to be freely rollable, and provided between the axially opposite end faces of the cage and the pair of flange portions inside or outside the shell. A cylindrical ring-shaped seal ring, and a manufacturing method of a seal ring of a shell-type needle bearing with a seal ring comprising:
A piercing process for forming a circular hole in a long metal plate;
A burring process for forming a cylindrical portion by bending the circumference of the circular hole of the material over the entire circumference;
A dimension regulating step of forming a first intermediate cylindrical material in which the cylindrical part is compressed in the axial direction with the outer peripheral surface of the cylindrical part being constrained to regulate the outer diameter and axial dimension of the cylindrical part. When,
In a state where the outer peripheral surface of the first intermediate cylindrical material is constrained, a handling punch having an outer diameter that matches the inner diameter of the seal ring is pushed into the inner diameter side, thereby having an inward flange-shaped surplus flange portion. A handling process for a second intermediate cylindrical material;
By inserting a punching punch having an outer diameter that matches the inner diameter of the seal ring, a surplus removal step for removing the surplus ribs and obtaining the seal ring;
Performed before any step after the burring step, and the step of separating the first or second intermediate cylindrical material or the seal ring from the metal plate;
A fitting back step that is performed after any one of the steps, and that the separated first or second intermediate cylindrical material or the seal ring is fitted back to the metal plate and is sent to the next processing step;
A method for manufacturing a seal ring of a shell-type needle bearing with a seal ring, comprising:
(2) The method for producing a seal ring for a shell type needle bearing with a seal ring according to (1), wherein a bearing cross-sectional height of the seal ring is 1 to 2.5 mm.
(3) The seal ring is formed without heat treatment by the piercing process, the burring process, the dimension regulating process, the handling process, the surplus removal process, the separation process, and the fitting back process. (1) The manufacturing method of the seal ring of the shell type needle bearing with a seal ring as described in (2).

  According to the method for manufacturing a seal-type needle bearing with a seal ring of the present invention, it is possible to form a seal ring with good dimensional accuracy that does not cause deformation due to heat treatment, and industrially mass production is possible. In addition, it can be made by a continuous processing apparatus that does not increase the transportation cost. In addition, the obtained shell type needle bearing with seal ring is provided with a pair of seal rings between both axial end faces of the cage and the pair of flange portions of the shell, so that the directionality of the bearing is lost and the housing, etc. As a result, the amount of penetrating oil can be controlled to be approximately equal regardless of the direction in which the lubricating oil flows.

It is sectional drawing of the shell type needle bearing with a seal ring which concerns on one Embodiment of this invention. It is sectional drawing which shows the manufacturing process of the 1st example of a seal ring. It is sectional drawing which shows the manufacturing process of the 2nd example of a seal ring. In a 2nd example, it is sectional drawing of the press apparatus used for a cutting-off process and the subsequent fitting back process. It is sectional drawing which shows a cutting-off process and the subsequent fitting back process in order of progress of a process. In a 2nd example, it is sectional drawing of the press apparatus used for a handling process and the subsequent fitting back process. It is sectional drawing which shows a handling process and the subsequent fitting back process in order of progress of a process. It is sectional drawing which shows the manufacturing process of the 3rd example of a seal ring. It is sectional drawing which shows the manufacturing process of the 4th example of a seal ring. It is sectional drawing which shows the conventional shell type needle bearing. It is a graph which shows the relationship between the direction of the oil flow of a conventional shell type needle bearing, and the amount of penetration oil.

  Hereinafter, a shell type needle bearing with a seal ring according to an embodiment of the present invention will be described in detail with reference to the drawings.

  The shell type needle bearing 30 with seal ring is disposed between the gear trains in the automatic transmission, between the gear shaft and the housing, or on the side of the oil pump gear. As shown in FIG. 1, the shell type needle bearing 30 includes a shell (a flanged outer ring) 31, a cage 32, a plurality of needles 33, and a pair of cylindrical seal rings 34, 34. A shaft (or inner ring member) (not shown) is rotatably supported.

  The shell 31 has a raceway surface 31a on the inner peripheral surface and a pair of inward flange portions 31b and 31b on both ends.

  The cage 32 is made of steel such as SPCC, S10C, AISI-1010, SCM415, SK5, SUJ2, or a resin such as polyamide 46, polyamide 66, PPS, etc., and has a plurality of pockets 32a extending in the circumferential direction. Have Here, the steel cage 32 is processed by a welding cage, a press cage, or machining. Further, the steel cage 32 may be subjected to conventional carbonitriding or salt bath soft nitriding (tuftride) heat treatment, but with a plate thickness applied to a needle bearing having a shaft diameter of 40 mm or more. In the case of a thin cage, the needle 33 may sink between the raceway surface 31 a and the outer diameter surface of the cage 32 due to heat treatment deformation of the cage 32. For this reason, in order to suppress such heat treatment deformation, the cage 32 employs tuftride SQ (single quench) processing, NV nitriding processing, or the like.

  The needle 33 is rotatably held in each pocket 32a of the retainer 32 so as to be freely rollable along the raceway surface 31a of the shell 31, and both ends thereof are crowned. Yes.

  The pair of seal rings 34, 34 are arranged on the inner side of the shell 31 between the axially opposite end faces 32 b, 32 b of the cage 32 and the inward flange portions 31 b, 31 b on the downstream side of the lubricating oil flow. Arranged in a guided state, the amount of lubricating oil passing through the needle bearing 30 is regulated substantially equally regardless of the direction in which the lubricating oil flows. The pair of seal rings 34 and 34 may be made of carbon steel such as S10C and S35C, steel such as SPCC, SPCE, and SUJ2, or may be made of resin such as polyamide 46, polyamide 66, and PPS. In addition, it is preferable that the pair of seal rings 34 have the same configuration because the directionality is less.

  The seal ring 34 is a floating seal having an outer diameter slightly larger than the outer diameter of the shaft and slightly smaller than the inner diameter of the shell 31. For example, the outer diameter of the shaft is 45 mm and the dimensional tolerance is +0.003 to +0.019, whereas the inner diameter of the seal ring 34 is 45 mm and the dimensional tolerance is +0.049 to +0.065. Therefore, when arranged between the outer diameter of the shaft and the inner diameter of the seal ring 34 concentrically so as to prevent wear between the seal ring 34 and the shaft and to regulate the amount of oil penetrating, 0 A gap of about 0.03 to 0.06 mm is provided.

  The shell type needle bearing 30 of the present embodiment has a shaft diameter of 10 to 100 mm or less, a width of 10 to 30 mm, and a bearing cross-sectional height of 1 to 5 mm. At 30 (for example, bearing cross-section height of 1 to 2.5 mm), the seal ring 34 is also thinned. For this reason, the seal ring 34 made of steel described above is subjected to press work (in this embodiment, a dimension regulating process, a punching process, and a re-pulling process described later), and the surface hardness is improved by work hardening. Therefore, it can be formed without performing heat treatment in the subsequent process, and has good dimensional accuracy without causing deformation due to heat treatment.

  Specifically, the steel seal ring 34 is formed by, for example, the following four examples of processing methods.

[Processing method of the first example]
In the case of this processing method, first, as shown in FIG. 2A, a metal plate 1 such as a mild steel plate or a stainless steel plate, which is a material, is subjected to piercing, and shown in FIG. Thus, a first preliminary intermediate material 3 having a circular hole 2 is obtained. Next, the first preliminary intermediate material 3 is subjected to a burring process in which the periphery of the circular hole 2 is bent over the entire circumference at right angles to the metal plate 1 as shown in FIG. The second preliminary intermediate material 5 having the cylindrical portion 4 is used. The volume of the cylindrical portion 4, particularly the axial length, is larger than the volume of the seal ring to be manufactured, particularly the axial length.

  The cylindrical portion 4 of the second preliminary intermediate material 5 is subjected to plastic working in a subsequent dimension regulating step, and this cylindrical portion 4 is converted into the first intermediate cylindrical material 6 shown in FIG. And In the dimension regulating step, the outer peripheral surface of the cylindrical portion 4 is constrained by a mold (not shown) having a cylindrical inner peripheral surface having a predetermined inner diameter, and the inner peripheral surface of the cylindrical portion 4 is not constrained. In the state, between a pair of flat surfaces that are arranged concentrically and move in the axial direction (for example, a receiving step formed on the inner peripheral surface of the end of the mold and a pressing mold fitted in the mold) The cylindrical portion 4 is pressed (compressed in the axial direction while being plastically deformed) to a desired dimension, that is, the axial dimension of the seal ring to be obtained. With the plastic deformation that is compressed in the axial direction in this way, the outer diameter and axial dimension of the cylindrical portion 4 are regulated to predetermined values, and the surplus wall bulges inward in the radial direction. The first intermediate cylindrical material 6 is obtained. The inner diameter of the first intermediate cylindrical material 6 is smaller than the inner diameter of the seal ring to be obtained.

In the case of the embodiment shown in FIG. 2, as shown in FIG. 2E, after the first intermediate cylindrical material 6 is formed, a separation step is performed, and the first intermediate cylindrical material 6 is formed. Is separated from the metal plate 1. This separation step is performed by punching using a press machine.
In this manner, the first intermediate cylindrical material 6 separated from the metal plate 1 is subsequently subjected to a handling process that expands the inner diameter dimension to an appropriate value (the inner diameter dimension of the seal ring to be obtained). In this handling process, the outer peripheral surface of the first intermediate cylindrical material 6 is restrained so that the outer diameter does not expand, while being appropriate (to be obtained) on the inner diameter side of the first intermediate cylindrical material 6. A handling punch having an outer diameter dimension (corresponding to the inner diameter dimension of the seal ring) is pushed in from one axial end side (upper side of FIG. 2F). By pushing the handling punch in such a manner, the surplus thickness present on the inner peripheral surface portion of the first intermediate cylindrical material 6 is collected on the other axial end side {lower side of (F) in FIG. 2}. As shown in (F), a second intermediate cylindrical material 8 having an inward flange-shaped surplus flange portion 7 on the inner peripheral surface of the other axial end portion is provided.

This second intermediate cylindrical material 8 is sent to the next surplus removal process to remove the surplus rib portion 7. In this surplus thickness removing step, by inserting a punching punch having an appropriate outer diameter dimension (corresponding to the inner diameter dimension of the seal ring to be obtained) inside the second intermediate cylindrical material 8, 7 is removed to obtain a seal ring 34 as shown in FIG.
The processing operation of the seal ring 34 can be completed at the stage shown in FIG. 2G, but at the stage shown in FIG. 2G, the inner diameter of the inner peripheral surface of the seal ring 34 or If it is difficult to make the properties as desired, as shown in FIG. 2H, the inner peripheral surface of the seal ring 34 may be rubbed with a handling jig and re-handled.

  In any case, the obtained seal ring 34 is sent to a process different from the present invention in which the seal ring 34 is subjected to predetermined processing. In this way, the seal ring 34, which is sent to another process, has an outer diameter, an axial dimension, and an inner diameter dimension regulated to appropriate values, so there is no need to scrape the axial end by turning or the like. . In addition, it is not necessary to perform processing that requires a large processing force such as extrusion processing, and the manufacturing cost of the seal ring 34 can be kept low.

  In the first example of the processing method, the seal ring 34 in which the inner diameter, the outer diameter, and the axial dimension are regulated to appropriate values can be industrially mass-produced, and can be configured at low cost, and the operation cost can be reduced. Can be made with a processing device that does not bulk up. In other words, the obtained seal ring 34 is controlled to have an outer diameter and an axial dimension in the dimension regulating process, and an inner diameter dimension is adjusted to an appropriate value by the handling process and the surplus removal process. Thus, a highly accurate cylindrical seal ring 34 in which each of these dimensions is set to an appropriate value can be obtained without scraping.

[Processing method of the second example]
3-7 has shown the processing method of the 2nd example. In the case of this example, the metal plate 1 is processed into the seal ring 34 by sequentially performing the steps shown in FIGS. This process is substantially the same as in the case of the processing method of the first example. Also in the case of this example, the re-handling process as shown in FIG. The feature of this example is that the metal plate 1 is a long sheet that is fed from an uncoiler (not shown) and wound around a recoiler (not shown), and is shown in FIGS. The point is that the process can be carried out in order. That is, the long metal plate 1 is intermittently fed in synchronization with the progress of the processing at a pitch (interval / pitch = integer) corresponding to the interval between adjacent processing devices for performing each process. However, the steps shown in FIGS. 3A to 3G are sequentially performed.

  Therefore, in the case of this example, the seal ring 34 is cut without cutting the long metal plate 1 over the entire width in any of the steps shown in FIGS. Sequentially send as processing progresses. Then, a second circular hole 10 larger than the circular hole 2 shown in FIG. 3B is formed on the long metal plate 1 drawn out from the uncoiler by the cutting step shown in FIG. Even in the formed state, the width dimension of the metal plate 1 is secured so that both ends in the width direction of the metal plate 1 remain connected to each other (“width dimension> diameter of the second circular hole 10”). To do). And the predetermined | prescribed process was given to the 1st intermediate cylindrical raw material 6 (and the 2nd intermediate cylindrical raw material 8 produced at the following processes) punched out from the inner side of the said 2nd circular hole 10 at the said cutting-off process. Then, after fitting back into the second circular hole 10 again, the metal plate 1 is fed into a processing apparatus that performs the next step as the metal plate 1 is fed. 3A to 3G is the same as the process shown in FIG. 2A to FIG. 2G as described above, and therefore, redundant description is omitted. In the following, the description will be focused on the point that the above-described fitting back can be performed so that the process shown in FIGS.

  The separation process and the fitting back process shown in FIG. 3E are performed by the processing apparatus shown in FIG. In the processing apparatus shown in FIG. 4, the metal plate 1 is restrained between the upper surface of the cylindrical die 14 and the lower surface of the restraining die 12 that moves up and down in the state of being given downward elasticity. 13, the first intermediate cylindrical material 6 is pushed into the die 14, and the first intermediate cylindrical material 6 is separated from the metal plate 1. Further, a push-back die 15 provided with an upward elastic force is provided on the inner diameter side of the die 14 so that an upward elastic force can be applied to the first intermediate cylindrical material 6. However, the push-back die 15 is retracted downward when the punch 13 is lowered based on the abutment between the abutting block 16 provided at the center of the upper surface and the lower end surface of the punch 13.

  3 using the machining apparatus as shown in FIG. 4 is performed in the order shown in FIGS. 5A to 5C. First, as shown in FIG. 5A, the first intermediate cylindrical material 6 that is still coupled to the metal plate 1 is fitted into the upper end of the die 14. Next, together with the ram 17 constituting the processing machine, the holding die 12 and the punch 13 are lowered, and the lower surface of the holding die 12 and the upper surface of the die 14 are moved as shown in FIG. The first intermediate cylindrical material 6 is pushed into the die 14 by the punch 13 while holding the metal plate 1 in between. As a result, the first intermediate cylindrical material 6 is separated from the metal plate 1, and at the same time, the second circular hole 10 is formed in the metal plate 1. After the separation, when the holding die 12 and the punch 13 are raised together with the ram 17, the push-back die 15 that has been pushed down by the punch 13 is lowered as shown in FIG. To rise. As a result, the first intermediate cylindrical material 6 is pushed into the second circular hole 10 by the push-back die 15 and is held inside the second circular hole 10. Therefore, by moving the metal plate 1, the first intermediate cylindrical material 6 is sent to the next handling process and the returning process shown in FIG.

  The handling process and the fitting back process shown in FIG. 3F are performed by the processing apparatus shown in FIG. In the processing apparatus shown in FIG. 6, the metal plate 1 is restrained between the upper surface of the receiving die 18 provided with upward elasticity and the lower surface of the cylindrical handling die 20 that moves up and down. The first intermediate cylindrical material 6 is pushed into the handling die 20 by 19. The ring punch 19 is provided on the inner diameter side of the receiving die 18 so as to be able to move up and down independently of the receiving die 18 and with an upward elasticity. Further, on the inner diameter side of the ring punch 19, a handling punch 21 for fixing the second intermediate cylindrical material 8 by handling the inner peripheral surface of the first intermediate cylindrical material 6 is fixed. The ring punch 19 is installed to be movable up and down around the handling punch 21, but the maximum rising amount is limited by the engagement between the inner peripheral surface of the ring punch 19 and the outer peripheral surface of the handling punch 21. Specifically, as shown in FIG. 6 and FIG. 7 (A), the maximum rising amount is such that the upper edge of the ring punch 19 is the receiving die when the receiving die 18 is most elevated. 18 is positioned slightly below the upper surface. Further, on the inner diameter side of the die 20, a push-back die 22 provided with downward elasticity is provided.

  The handling process and the fitting back process shown in FIG. 3 (F) using the processing apparatus as shown in FIG. 6 are performed in the order shown in FIG. 7 (A) → (C). First, as shown in FIG. 7A, the first intermediate cylindrical material 6 held inside the second circular hole 10 is fitted inside the upper end of the receiving mold 18, The lower end surface is abutted against the upper end edge of the ring punch 19. Next, as shown in FIG. 7B, the handling die 20 and the push-back die 22 are lowered together with the ram 23 constituting the processing machine, and the metal plate 1 is formed on the lower surface of the handling die 20. Is pushed down, the first intermediate cylindrical material 6 is extracted upward from the second circular hole 10, and is fed into the inner diameter side of the handling die 20 by the ring punch 19. As the handling die 20 is further lowered along with the ram 23, the handling punch 21 is moved to the inner diameter side of the first intermediate cylindrical material 6 fed to the inner diameter side of the handling die 20 in this way. Pushed in. As a result, the inner diameter of the first intermediate cylindrical material 6 is restricted to a predetermined size, and the surplus portion is collected at the upper end portion of the inner peripheral surface, and the surplus rib portion 7 {FIG. (F)} is formed as the second intermediate cylindrical material 8. After the second intermediate cylindrical material 8 is formed in this way, when the handling die 20 is lifted together with the ram 23, the metal plate 1 pushed down by the handling die 20 is lowered. At the same time as the mold 18 is raised, the push-back mold 22 is lowered with respect to the handling die 20. At this time, the push-back die 22 presses the surplus rib portion 7 {see FIG. 3F) just formed on the inner peripheral surface of the upper end portion of the second intermediate cylindrical material 8 downward. The second intermediate cylindrical material 8 is pushed into the second circular hole 10 and is held inside the second circular hole 10.

  Therefore, by moving the metal plate 1, the second intermediate cylindrical material 8 is sent to the next surplus removal process and the return process shown in FIG. If the re-handling process shown in FIG. 2H is performed after the surplus removing process shown in FIG. 3G, the seal ring obtained by the surplus removing process is performed. A returning step of pushing 34 into the second circular hole 10 of the metal plate 1 is performed. On the other hand, if the seal ring 34 obtained in the surplus removal process is sent to a process for performing a predetermined process on the seal ring 34, which is different from the present invention, the return process is omitted. It is also possible to {take out the seal ring 34 separated from the metal plate in FIG. 3G as it is}.

  In the case of this example configured as described above, in addition to the operations and effects obtained by the first example, it can be manufactured by a continuous processing apparatus that can be industrially mass-produced and that does not increase operating costs. You can get the action and effect. That is, in the case of this example, a long metal plate 1 sent out from an uncoiler and wound up by a recoiler is used as the metal plate 1, and the metal plate 1 is separated from the metal plate 1 in accordance with a separation step and is predetermined. Since the processed first and second cylindrical intermediate materials 6 and 8 are pushed into the second circular hole 10 of the metal plate 1 again, the intermediate materials 6 and 8 are inserted into the metal plate 1. At the same time, it can be sent to the next processing step. That is, compared with transfer processing, the capital investment is low, and the processing efficiency is good (the processing cycle is short), so that progressive processing can be performed. For this reason, the processing cost of the seal ring 34 can be further reduced.

[Processing method of the third example]
FIG. 8 shows a processing method of the third example. In the case of this example, there is a direction in which the second cylindrical intermediate material 8 is extracted from the second circular hole 10 of the metal plate 1 and fitted again in the handling step and the fitting back step shown in FIG. The metal plate 1 is upside down from the case of the processing method of the second example described above. It goes without saying that the configuration of the processing apparatus shown in FIGS. About the structure of another part, since it is the same as that of the processing method of the 2nd example mentioned above, the overlapping description is abbreviate | omitted.

[Fourth Example Processing Method]
FIG. 9 shows a processing method of the fourth example. In the case of this example, the detaching step and the returning step shown in FIG. 9D are set after the burring step shown in FIG. About the structure of another part, since it is the same as that of the processing method of the 2nd example mentioned above, the overlapping description is abbreviate | omitted. In short, when carrying out the present invention, the separation step can be set at an arbitrary timing after the burring step, taking into consideration the ease of the processing operation, ensuring the processing accuracy, and the like.

  As described above, the shell type needle bearing 30 with seal ring of the present embodiment has a pair of seal rings 34 between the axial end faces 32b, 32b of the cage 32 and the pair of flange portions 31b, 31b of the shell 31. , 34 is eliminated, the directionality of the bearing is lost, and the assembly into the housing or the like is facilitated, and the amount of penetrating oil can be controlled to be substantially equal regardless of the direction in which the lubricating oil flows. Accordingly, in this embodiment, the upstream side seal ring 34 hardly dams the lubricating oil regardless of which direction the lubricating oil flows, and is almost the same as when the lubricating oil flows from the direction A in FIG. Equivalent penetrating oil amount.

  Further, since the steel seal ring 34 can be formed by press work without performing heat treatment, the thickness of the seal ring 34 can be reduced, and the seal ring 34 can have good dimensional accuracy and have a predetermined hardness by work hardening. Can do. Further, since the seal ring 34 is a floating seal having a minute gap in a state of being concentrically arranged with a shaft or an inner ring member which is a counterpart member, torque can be reduced as compared with the contact type seal.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
In this embodiment, the outer ring shell 31 having the raceway surface 31a on the inner peripheral surface and the inward flange portions 31b and 31c on both ends is used, but the raceway surface is provided on the outer peripheral surface and the outward flange portions are provided on both ends. Each of the inner ring shells may be used. In this case, the pair of seal rings are provided on the outside of the shell between the both axial end surfaces of the cage and the pair of outward flange portions.

30 Shell-type needle bearing with seal ring 31 Shell 31a Raceway surface 31b Inward flange (flange)
32 Cage 33 Needle 34 Seal ring

Claims (3)

A shell having a raceway surface on the inner or outer peripheral surface and a pair of flange portions on both ends, a cage having a plurality of pockets in the circumferential direction, and rolling along the raceway surface A plurality of needles held in the respective pockets, and a cylindrical shape provided between the axial end faces of the cage and the pair of flange portions inside or outside the shell so as to be freely A pair of seal rings, and a manufacturing method of a seal ring of a shell type needle bearing with a seal ring, comprising:
A piercing process for forming a circular hole in a long metal plate;
A burring process for forming a cylindrical portion by bending the circumference of the circular hole of the material over the entire circumference;
A dimension regulating step of forming a first intermediate cylindrical material in which the cylindrical part is compressed in the axial direction with the outer peripheral surface of the cylindrical part being constrained to regulate the outer diameter and axial dimension of the cylindrical part. When,
In a state where the outer peripheral surface of the first intermediate cylindrical material is constrained, a handling punch having an outer diameter that matches the inner diameter of the seal ring is pushed into the inner diameter side, thereby having an inward flange-shaped surplus flange portion. A handling process for a second intermediate cylindrical material;
By inserting a punching punch having an outer diameter that matches the inner diameter of the seal ring, a surplus removal step for removing the surplus ribs and obtaining the seal ring;
Performed before any step after the burring step, and the step of separating the first or second intermediate cylindrical material or the seal ring from the metal plate;
A fitting back step that is performed after any one of the steps, and that the separated first or second intermediate cylindrical material or the seal ring is fitted back to the metal plate and is sent to the next processing step;
A method for manufacturing a seal ring of a shell-type needle bearing with a seal ring, comprising:   The method for producing a seal ring of a shell type needle bearing with a seal ring according to claim 1, wherein a bearing cross-sectional height of the seal ring is 1 to 2.5 mm. The said seal ring is shape | molded without performing heat processing by the said piercing process, a burring process, a dimension control process, a handling process, a surplus removal process, a cutting process, and a fitting process. Or the manufacturing method of the seal ring of the shell type needle roller bearing with a seal ring of 2.

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