JP2010091007A - Retainer for conical roller bearing, and conical roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain both an easy close fitting operation to an inner ring and non-dropping of a rolling element without strict dimensional management of a small collar. <P>SOLUTION: In a retainer 1 for conical roller bearing, a slit 6 is formed in a minor diameter-side annular part 2 to extend from its inner diameter surface side to its outer diameter surface side. When the retainer is fitted to an inner ring 10 with a conical roller 9 being housed, the slit width of the slit 6 is extended to extend the inside diameter of the annular part 2, whereby the fitting can be smoothly performed by the diameter extension. Further, a circumferential groove 8 is formed in the annular part 2, a ring member 7 is fitted to the circumferential groove 8 after completion of the fitting, and the inner diameter of the annular part 2 is contracted by the fastening force of the ring member 7, whereby the conical roller 9 can be prevented from dropping out of the ring part 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tapered roller bearing retainer used for, for example, an axle of a railway vehicle, and a tapered roller bearing incorporating the retainer.

  For example, as shown in FIG. 10, the tapered roller bearing uses a tapered roller 9 as a rolling element so that the inner ring 10 and the outer ring 18 can smoothly rotate relative to each other. As the cage 1 that holds the tapered rollers 9 at a predetermined interval, there are a main body made of metal such as carbon steel and a main body made of resin.

  While this metal cage 1 has the advantage that the material itself has high rigidity and can stably hold the rolling element 9, when the cage 1 containing the rolling element 9 is provided in the inner ring 10, The cage 1 is crimped (part of the cage 1 is partially deformed by applying an external force), and the rolling element 9 is detached from the cage 1 or the cage 1 is detached from the inner ring 10. It is necessary not to be. For this reason, it is necessary to prepare a dedicated mold for caulking work, which increases costs.

  Further, the metal cage 1 is likely to be worn due to contact with the rolling elements 9 during use. If the wear powder is mixed in the lubricating grease sealed in the bearing, the lubricity may be impaired and seizure may occur. For this reason, it is necessary to disassemble the bearing and replace the grease every predetermined usage time, which is very complicated.

Therefore, in recent years, instead of the metal cage 1, a resin cage 1 has been actively adopted (see, for example, Patent Document 1).
JP 2005-121097 A

Since this resin-made cage 1 is richer in elasticity than metal, it can fit the rolling elements 9 by expanding the pocket portion 5 against the elastic force 1. Further, when the cage 1 containing the rolling elements 9 is provided on the inner ring 10, the cage 1 is only fitted from the side of the small wheel 11 of the inner ring 10 and is brought into a clogged state (a state in which the cage is properly fitted). The caulking work is not required unlike the metal cage 1. For this reason, a dedicated die for caulking work is not required, and there is a great merit in terms of equipment and work cost.
Further, since the resin cage 1 has high elasticity, compared to the metal cage 1, wear due to contact with the rolling elements 9 is less likely to occur. Therefore, there is an advantage that the frequency of grease replacement can be reduced.

  In the method using the resin cage 1 shown in Patent Document 1, the rolling element 9 accommodated in the cage 1 is moved over the small rod 11 formed on the inner ring 10 from the small diameter side, and the holding work is performed. . For this reason, the lower the height of the gavel 11, the easier it is to perform the work. On the other hand, if the height of the gavel 11 is too low, when the cage 1 is deformed by the weight of the rolling element 9 during a bearing cleaning operation or the like, the rolling element 9 falls off (separated). There is a fear. Moreover, since the cage 1 made of resin sometimes absorbs moisture and expands when used in a high humidity environment, its dimensional management is also important.

  For this reason, it is necessary to collect a large amount of experimental data and make a prototype in the design stage, and to manage the height of the gavel 11 (clamping allowance) taking into account the deformation due to its own weight and the expansion due to water absorption. The design / production is very complicated.

  In view of this, the present invention can achieve both ease of carrying-in work on the inner ring and difficulty of falling off of the rolling element without carrying out strict size control of the gavel or the cage in the resin cage. The challenge is to make it.

  In order to solve the above-mentioned problems, the present invention forms a slit in the cage, expands the cage by expanding the slit width, and easily fits the cage containing the rolling elements into the inner ring. On the other hand, after this fitting, a ring member that prevents the slit width from being widened is fitted, and the fastening action of this ring member ensures that the cage is fitted into the inner ring. The rolling elements were prevented from falling off due to this.

  By forming the slit in this way, the inner diameter of the cage can be increased freely, so that when the cage is fitted into the inner ring, it is possible to easily get over the gavel formed on the inner ring. . For this reason, it is not necessary to strictly manage the dimensions of the gavel or the cage, the manufacturing cost thereof can be suppressed, and the above-mentioned clogging operation can be performed smoothly, so that the operation cost can be reduced.

  As a configuration of the present invention, a small diameter side annular part, a large diameter side annular part, a column part connecting both the annular parts, an inner surface of the small diameter side annular part, a large diameter side annular part In the tapered roller bearing cage composed of the inner surface and the pocket portion constituted by the inner surface of the adjacent column portion, a slit is formed from the inner diameter surface side to the outer diameter surface side of the small diameter side annular portion, While fitting the rolling element in the inner ring, the slit width of the slit is expanded to increase the inner diameter of the small-diameter side annular portion, and the fitting is smoothly performed by this expansion, A circumferential groove is formed in the small-diameter side annular portion, a ring member is fitted into the circumferential groove, and the inner diameter of the small-diameter-side annular portion is reduced by the tightening force of the ring member, and the small-diameter-side circular portion The rolling elements were prevented from falling off the ring part.

  When the cage is fitted into the inner ring, after rolling elements are stored in the pockets of the cage, the shaft extends from the large-diameter side annular portion side of the cage so as to get over the small collar formed on the inner ring. It is slid in the direction of the heart, and finally the small-diameter-side annular part gets over the gavel. After this fitting, the large flange formed on the opposite side of the small flange in the axial direction comes into contact with the end surface of the rolling element (the large diameter side end surface of the tapered roller), and the small flange moves toward the small diameter side of the rolling element. Prevents its dropout by preventing the movement of.

  Since the slit width of the slit can be enlarged to freely increase the inner diameter of the small-diameter side annular portion when the small rod is moved over, the fitting property of the cage can be greatly improved. Furthermore, since the ring member securely fastens the small-diameter-side annular portion after the fitting, the small-diameter-side annular portion may be deformed (expanded) due to its own weight or the like, and the rolling element may fall off. Low. For this reason, strict dimensional control is not required as in the prior art, and there is no need to consider dimensional changes associated with water absorption of the cage. For this reason, the allowable range of dimensions in designing and manufacturing the cage is widened, and the manufacturing cost can be reduced.

  Moreover, in the said structure, a ridge can be formed in the small diameter side annular part instead of forming a circumferential groove, and a ring member can also be fitted in this ridge.

  Also in this case, it is because the ring member can exert the same action and effect that it exerts a tightening force at the small-diameter side annular portion and prevents the rolling elements from falling off from the small-diameter side annular portion.

  Further, in the formation of the slit, it can be formed so that the tip of the slit reaches the pocket portion.

  As described above, this slit is for temporarily expanding the inner diameter of the small-diameter side annular portion, and its position can be appropriately selected as long as it can exert its function. . As the position, for example, various things such as a part extending from the small diameter side annular part to the middle of the pillar part and a part extending through the pillar part to the large diameter side annular part can be considered. In such various forms, the shape in which the slit extends from the small-diameter side annular portion to the pocket portion can be selected.

  When the slit is terminated at the pocket portion as described above, there is an advantage that the entire length of the slit can be shortened and the slit width can be easily enlarged. Furthermore, since the ring member for tightening the slit only needs to be provided in the small-diameter side annular portion where the slit is formed (since the large-diameter side annular portion does not expand in diameter), the tightening configuration by the ring member is simple. There is also a merit that it can be.

  Further, among the plurality of pockets constituting the cage, the opening width on the outer diameter side of the pocket portion in which the slit is formed is set to be equal to or larger than the diameter of the rolling element, and the rolling element stored in the pocket portion is in the outer diameter direction. It can also be made available for removal.

  For example, at the time of periodic inspection of the bearing, the cage and the rolling element are removed from the inner ring, and the state of the rolling surface of the inner ring is visually confirmed. However, once the rolling element is fitted into the cage and fastened with a ring member, the rolling element cannot be removed unless the cage is cut, and the inspection work becomes complicated and requires cost. Therefore, if the rolling elements can be taken out freely as described above, the state of the rolling surface can be visually observed without cutting the cage, and the efficiency of the inspection work is increased.

  In this configuration, the opening width on the outer diameter side of the pocket portion that does not constitute the slit is made smaller than the diameter of the rolling elements, and the rolling elements stored in these pocket portions can be taken out in the outer diameter direction. You can make it impossible.

  By doing in this way, the rolling element accommodated in pocket parts other than the pocket part in which the said slit was formed becomes stable, and the rotation of the rolling element becomes stable. Since the rolling elements that can be taken out are only those located in the pocket portion in which the slits are formed (1 to 2 at most), there is almost no possibility that the rolling elements will rattle due to this.

  In each of the above-described configurations, the width of the circumferential groove can be reduced in the portion where the slit is formed as compared with other portions.

  The slit formed in the cage is narrowed by tightening the ring member, and the opposing surfaces come into contact with each other. At the time of this contact, the larger the area, the more stable the contact state, and the rolling elements can be rotated smoothly. As described above, by narrowing the width of the circumferential groove at the slit portion, the abutting area can be expanded while securing the effect of tightening the cage by the ring member, and therefore the tightening is more stable. Become.

  In addition, a protrusion is formed on the inner surface of the ring member, and a recess is formed in the circumferential groove, and the protrusion is inserted into the recess when the ring member is fitted into the circumferential groove. It can also be fitted.

  By forming the protrusions in this way, the contact area between the ring member and the circumferential groove increases. If it does so, the clamping force between both will become still more reliable, the deformation | transformation of the holder | retainer at the time of rolling-element rotation will be suppressed, and the reliability of a bearing can be improved further. The shape of the protruding portion can be selected as appropriate, but for example, it can be a protruding shape. By fitting this protrusion into a recess formed in the circumferential groove, the ring member can be prevented from sliding relative to the circumferential direction of the circumferential groove, and the fastening stability thereof is further improved. The number of protrusions can also be selected as appropriate, but by providing at least two locations (for example, two locations facing each other on the circumference), a force that causes deformation of the cage acts when the rolling element rotates. Even in this case, the deformation can be prevented by maintaining the state in which the plurality of protrusions are firmly fitted in the recesses.

  Alternatively, a ridge is formed on the side surface of the ring member, and a secondary circumferential groove into which the ridge is fitted is formed in the circumferential groove, and the secondary circumferential groove is inserted into the circumferential groove when the ring member is fitted into the circumferential groove. A ridge can be fitted.

  Once the protrusion formed on the side surface is fitted into the circumferential groove, it is not easily removed even if a pulling (peripheral direction) force is applied to the ring member. For this reason, tightening of the cage by the ring member can be made more stable.

  A material having a higher tensile strength than the material constituting the small-diameter side annular portion can be used for the ring member.

  As described above, the cage in which the rolling element is housed may be expanded by the slit width being increased due to its own weight, etc., and the housed rolling element may fall off. Since this diameter expansion is caused by the elasticity of the material of the cage itself, a material having a tensile strength exceeding this elasticity is used as a material for a ring member that clamps the cage, thereby tightening the cage. It can be even more certain.

  According to the present invention, a slit is formed in the cage, the diameter of the cage is increased by increasing the slit width, and the cage containing the rolling elements is easily fitted into the inner ring, while the fitting is performed. Later, a ring member for preventing the slit width from being expanded was fitted, and the fastening of the ring member ensured the fitting of the cage to the inner ring. For this reason, it is possible to achieve both ease of carrying on the inner ring and difficulty of falling off the rolling element without carrying out strict size control of the gavel or cage. The reliability of existing bearings is further improved.

The principal part of the retainer 1 for tapered roller bearings according to the present invention is shown in FIG. This cage 1 is used for a tapered roller bearing as shown in FIG. 10, and the whole is made of a resin material.
This retainer 1 is similar to the conventional retainer 1 for tapered roller bearings, and includes a small-diameter-side annular portion 2, a large-diameter-side annular portion 3, and a column connecting these two annular portions 2, 3. It is comprised from the part 4 and the pocket part 5 comprised by the inner surface of the small diameter side annular part 2, the inner surface of the large diameter side annular part 3, and the inner surface of the adjacent pillar parts 4 and 4, but the small diameter side It differs from the conventional one in that a slit 6 extending from the annular portion 2 to the pocket portion 5 is formed and a circumferential groove 8 into which a ring member 7 to be described later is fitted is formed in the small diameter side annular portion 2. ing.

  In the tapered roller bearing assembly, first, the tapered roller 9 is accommodated in the pocket portion 5 of the cage 1 from the inner surface side, and the small ring of the inner ring 10 is kept in the accommodated state as shown in FIG. The cage (conical roller) is slid from the 11 side to the large collar 12 side. During this sliding, the slit width of the slit 6 is expanded by the contact force between the small flange 11 of the inner ring 10 and the tapered roller 9, and the inner diameter of the small-diameter side annular portion 2 is expanded. Then, the tapered roller 9 can smoothly get over the gavel 11, and the holding of the cage 1 (the tapered roller) to the inner ring 10 is completed quickly.

  When this engagement is completed, the small-diameter side annular portion 2 is reduced in its original diameter by its elastic force, but as shown in FIG. The ring member 7 is fitted into the circumferential groove 8 formed in the ring portion 2. Since this ring member 7 is a metal member and its rigidity is sufficiently higher than the resin material constituting the cage 1, the diameter of the cage 1 can be reliably prevented by fitting the ring member 7. Or if it can prevent the said diameter expansion reliably, it can replace with the metal ring member 7, and can employ | adopt the resin-made ring member 7 with sufficient rigidity. In this fitting, an adhesive is used to secure the fitting state, but other methods such as applying ultrasonic waves to weld the cage 1 and the ring member 7 can be appropriately employed. .

If the ring member 7 can prevent the diameter of the cage 1 from expanding, the shape of the ring member 7 can be appropriately selected. The ring member 7 shown in FIG. 3 has a uniform width over its entire circumference. For example, as shown in FIG. 4, the portion where the slit 6 is formed is compared with the other portions. A narrow portion 8 a in which the width of the circumferential groove 8 is reduced may be formed, and the ring member 7 that matches the width of the circumferential groove 8 may be fitted.
As described above, when the opposing surfaces of the slit 6 are in contact with each other, the contact state is more stable as the contact area is larger. Therefore, by making it as shown in the figure, the abutting area can be enlarged while securing the effect of tightening the cage 1 by the ring member 7, so that the tightening is further stabilized.

  Further, as shown in FIG. 5, a taper 13 is formed on the end surfaces of the ring member 7 and the circumferential groove 8, and as shown in FIG. 6, a protrusion 14 is formed on the side surface of the ring member 7, and the circumferential groove 8. An auxiliary circumferential groove 15 into which the protrusion 14 fits can be formed. In these configurations, once the ring member 7 is fitted into the circumferential groove 8, the ring member 7 is not easily removed by the engagement action of the taper 13 or the protrusion 14. For this reason, the reliable clamping | tightening effect | action by the ring member 7 can be exhibited.

  Further, as shown in FIG. 7, the protrusion 16 can be formed on the inner surface of the ring member 7, and the concave portion 17 into which the protrusion 16 fits can be formed in the circumferential groove 8. In this configuration, the contact area between the ring member 7 and the circumferential groove 8 is increased, the clamping force between the two is further ensured, the deformation of the cage 1 during rotation of the rolling element is suppressed, and the bearing Reliability can be further improved.

  As shown in FIGS. 1 to 7, instead of forming the circumferential groove 8 in the small diameter side annular portion 2, as shown in FIG. 8, a similar circumferential groove 8 is formed in the ring member 7, and this circumferential groove is formed. 8, the protrusion 14 formed in the small diameter side annular portion 2 may be fitted. This is because even in this configuration, a reliable tightening effect by the ring member 7 can be exhibited. It is good also as a structure which provides the meat thin part R in this protrusion 14. By forming the thinned portion R, the protrusion 14 can be easily deformed inward, and the ring member 7 can be more easily fitted.

  Moreover, as shown in FIG. 9, the tapered roller 9 accommodated in the pocket part 5 is formed by forming the taper 13 in the column part 4 of the cage 1 and narrowing the gap between the tapers 13 in the outer diameter direction. While preventing the taper 13 from being formed only in the pocket portion 5 in which the slit 6 is formed, the tapered roller 9 accommodated in the pocket portion 5 can be taken out in the outer diameter direction while preventing the outer diameter direction from being taken out. You may do it. In this way, at the time of periodic inspection of the bearing, the outer ring 18 is removed, and the tapered roller 9 is removed from the pocket portion 5 in which the slit 6 is formed. The state of can be easily inspected visually.

The perspective view which shows one Embodiment of the holder | retainer concerning this invention Side sectional view showing fitting of cage and rolling elements to inner ring Side surface sectional drawing which shows other embodiment which concerns on this invention The top view which shows other embodiment which concerns on this invention Side surface sectional drawing which shows other embodiment which concerns on this invention Side surface sectional drawing which shows other embodiment which concerns on this invention The other embodiment which concerns on this invention is shown, (a) is side sectional drawing, (b) is a top view Side surface sectional drawing which shows other embodiment which concerns on this invention Side sectional view showing storage of rolling elements in cage Side sectional view showing a general tapered roller bearing

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cage 2 Small diameter side ring part 3 Large diameter side ring part 4 Column part 5 Pocket part 6 Slit 7 Ring member 8 Circumferential groove 9 Tapered roller (rolling element)
10 Inner ring 11 Small collar 12 Large collar 13 Taper 14 Projection 15 Sub circumferential groove 16 Protrusion 17 Recess 18 Outer ring

Claims (10)

Small-diameter-side annular portion (2), large-diameter-side annular portion (3), pillar portion (4) connecting these two annular portions (2, 3), and small-diameter-side annular portion (2) A tapered roller bearing retainer comprising a pocket portion (5) composed of an inner surface of the inner surface, an inner surface of the large-diameter side annular portion (3) and an inner surface of an adjacent column portion (4, 4),
When the slit (6) from the inner diameter surface side to the outer diameter surface side of the small-diameter-side annular portion (2) is formed and fitted into the inner ring (10) with the rolling element (9) stored, the slit (6) The slit width of (6) is expanded to increase the inner diameter of the small-diameter-side annular portion (2), and the above-mentioned fitting is smoothly performed by this expansion, while the small-diameter-side annular portion (2) is expanded. A circumferential groove (8) is formed, a ring member (7) is fitted into the circumferential groove (8), and the inner diameter of the small-diameter side annular portion (2) is reduced by the tightening force of the ring member (7). The tapered roller bearing retainer is characterized in that the rolling element (9) is prevented from falling off from the small diameter side annular portion side (2).   Instead of forming the circumferential groove (8) in the small diameter side annular part (2), a ridge (14) is formed, and the ring member (7) is fitted into the ridge (14). The cage for a tapered roller bearing according to claim 1.   The cage for tapered roller bearings according to claim 1 or 2, wherein a tip of the slit (6) is formed so as to reach the pocket portion (5).   Among the plurality of pocket portions (5), from the pocket portion (5) in which the slit (6) is formed, the rolling element (9) accommodated in the pocket portion (5) can be easily moved in the outer diameter direction. 4. The cage for a tapered roller bearing according to claim 3, wherein an opening width of the pocket portion (5) is determined so that the pocket portion can be taken out.   The opening part on the outer diameter side of the pocket part (5) not forming the slit (6) is made smaller than the diameter of the rolling element (9), and the rolling elements (9) housed in these pocket parts (5) ) Cannot be taken out in the outer diameter direction. 5. The tapered roller bearing retainer according to claim 4, wherein   The axial width of the circumferential groove (8) into which the ring member (7) is fitted is made smaller in the portion where the slit (6) is formed than in the other portions. The cage for tapered roller bearings as described in any one of these.   A projection (16) is formed on the inner surface of the ring member (7), and a recess (17) into which the projection (16) is fitted is formed in the circumferential groove (8), and the ring to the circumferential groove (8) is formed. The cage for tapered roller bearings according to any one of claims 1 to 6, wherein the projection (16) is fitted into the recess (17) when the member (7) is fitted. .   A ridge (14) is formed on the side surface of the ring member (7), and a secondary circumferential groove (15) into which the ridge (14) is fitted is formed in the circumferential groove (8), and the circumferential groove (8 7. The protrusion (14) is fitted into the auxiliary circumferential groove (15) when the ring member (7) is fitted into the groove (7). 7. Cage for tapered roller bearings.   The cone according to any one of claims 1 to 8, wherein the ring member (7) is made of a material having a higher tensile strength than a material constituting the small-diameter side annular portion (2). Roller bearing cage.   A tapered roller bearing incorporating the tapered roller bearing retainer according to any one of claims 1 to 9.

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