JP2008240763A - Retainer for cylindrical roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retainer for a cylindrical roller bearing eliminating inclination and twisting of respective pillar parts. <P>SOLUTION: In the retainer for the cylindrical roller bearing having a pocket 10 for retaining a plurality of cylindrical rollers 5 between an inner ring 1 and an outer ring 2, it comprises a pair of annular side plates 7, 9 and a plurality of pillar parts 8 for connecting these side plates 7, 9, axial projections 11 are provided on both ends of the respective pillar parts 8, and a plurality of insertion holes 12 fitted with the projections 11 of the respective pillar parts 8 are formed in a circumferential direction of the respective side plates 7, 9 at a constant pitch. The respective projections 11 have taper parts 15 approaching toward the pillar part and engaged with a peripheral edge of the insertion hole 12 on both side surfaces in a radial direction. When the projection 11 is fitted to the insertion hole 12 by fastening fitting, since the peripheral edge of the insertion hole 12 is engaged with the taper part 15, the pillar part 8 is positioned relative to the side plates 7, 9. Thereby, when the projection 11 of the pillar part 8 is calked, the pillar part 8 can be prevented from being inclined and twisted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a cage used for a cylindrical roller bearing incorporated in a rotation support portion of various mechanical devices such as a construction machine such as a wheel loader (hydraulic pump or the like).

  Cylindrical roller bearings that support rotation support portions of various mechanical devices include cages that hold a plurality of cylindrical rollers at predetermined intervals between an inner ring and an outer ring. As this cage, a comb type cage formed by rice bran is often used, and a plurality of column portions projecting in the same direction in the axial direction are provided in the circumferential direction on the annular portion, and the tip portions of the respective column portions are provided. There is known a method in which a projection provided on the side plate is inserted into an insertion hole provided on an annular side plate and each column portion and the side plate are coupled by caulking the tip of the projection (see, for example, Patent Document 1). ).

In this comb cage, the tip of each column protruding from the annular body is supported by the side plate. Therefore, when the cylindrical roller bearing is operated at high speed, the tip of the column is moved in the outer diameter direction by the centrifugal force of rotation. The elastic deformation of is suppressed. By suppressing the elastic deformation of the column portion, excessive contact between the circumferential side surface of the column portion and the rolling surface of the cylindrical roller is prevented, and the strength of the cage itself is ensured.
JP 2006-90459 A

  However, the above comb-shaped cage has a loose fit between the projection of the column and the insertion hole of the side plate, and there is a gap between the insertion hole and the projection, and the projection of each column is crimped to the side plate. At this time, the column part and the side plate move in the radial direction. When the column part moves, when the column holder is assembled, the column part is joined in a state of being tilted or twisted with respect to the side plate. For this reason, distortion occurs in the pitch circle (PCD) of the cylindrical roller, and the smooth rolling of the cylindrical roller in the pocket is hindered.

  Also, even if the side plate and the column portion are crimped in a state where the column portion is arranged at a constant pitch with respect to the axial direction of the annular portion using a jig, the gap between the projection of the column portion and the insertion hole of the side plate In this case as well, there is a possibility that the column portion moves in the radial direction because there is a gap in the gap.

  Then, this invention makes it a subject to eliminate the inclination and twist of each pillar part.

  In order to solve the above problems, the present invention comprises a pair of annular side plates and a plurality of pillars connecting the side plates, and axial projections are provided at both ends of each pillar, In the circumferential direction of each side plate, a plurality of insertion holes for fitting the projections of the column portions are formed at a constant pitch, and the projections and the insertion holes are fitted together in a state where the projections are fitted to the insertion holes. A configuration with an interference fit was adopted.

  According to this configuration, when the column part is fitted to the side plate, each column part is fitted to the side plate with a required tightening margin, so when the column part is positioned with respect to the side plate and the protrusion of the column part is crimped It is possible to prevent the column portion from being tilted or twisted.

  The projections of the column portions have tapered portions that expand toward both ends in the radial direction toward the tip, and the insertion hole peripheral edge of the one end surface of each side plate in a state where the projections are fitted into the insertion holes. A portion that engages with the tapered portion may be employed.

  When a projection having a tapered portion is fitted into the insertion hole, the side plate is pressed against the column portion by the action of an axial component of the spreading force on the peripheral edge of the insertion hole. It is done. By this pressing, the axial displacement of each side plate can be prevented.

  In addition, a fitting recess is formed in the peripheral edge portion of the insertion hole on the other end surface of each side plate, a reinforcing step portion protruding in the axial direction is provided around the protrusion of the column portion, and the reinforcing step portion is provided in the fitting recess portion. If they are fitted, the strength against shear stress acting between the projection of the column portion and the inner peripheral surface of the insertion hole of the side plate can be improved by rolling of the cylindrical roller during the bearing operation.

  When the reinforcing stepped portion fits into the fitting concave portion, the radial gap between the fitting concave portion and the reinforcing stepped portion is the diameter of the inner side surface of the insertion hole and the side surface on the column portion side of the protrusion. If it is smaller than the gap in the direction, when the radial position between the insertion hole and the protrusion is displaced, the reinforcing stepped portion abuts against the radially inner surface of the fitting recess, and the displacement can be suppressed.

  Further, if an axial gap is provided between the fitting recess and the reinforcing stepped portion, the side plate and the column portion are in contact with each other, so that the side plate is pressed in the axial direction by the tapered portion of the protrusion described above. However, it acts on the column part instead of the reinforcing step part, and each side plate is reliably pressed against the column part.

  As described above, according to the present invention, since the protrusions provided on the pillar portions are fitted into the insertion holes of the pair of side plates by interference fitting, the inclination and twist of the pillar portions can be eliminated.

  Embodiments of the present invention are shown in FIGS. As shown in FIGS. 1A and 1B, the cylindrical roller bearing of this embodiment includes an inner ring 1 having a raceway surface 3 on an outer diameter surface, an outer ring 2 having a raceway surface 4 on an inner diameter surface, and the inner ring. A plurality of cylindrical rollers 5 incorporated so as to be able to roll in the circumferential direction between the respective raceway surfaces 3 and 4 of the outer ring 2 and a retainer 6 that holds the cylindrical rollers 5 at predetermined intervals in the circumferential direction. It consists of. The cylindrical roller bearing is not limited to a single row cylindrical roller bearing as shown in the figure, and may be a double row cylindrical roller bearing or a multi-row cylindrical roller bearing.

  As shown in FIG. 2, the retainer 6 includes a pair of annular side plates 7 and 9 and a plurality of column portions 8 that connect the side plates 7 and 9.

  As shown in FIG. 2, the pair of side plates 7 and 9 are formed such that respective center circles P1 and P2 forming a center line in the radial direction have the same diameter, and the center circle P1 (P2 ) The insertion holes 12 are formed at a constant pitch. A plurality of column portions 8 are arranged between the pair of side plates 7 and 9 at the same pitch as the formation pitch of the insertion holes 12. A space surrounded by the side surfaces in the circumferential direction of the adjacent column portions 8 and 8 and the pair of side plates 7 and 9 becomes a pocket 10, and the cylindrical roller 5 is rotatably held in the pocket 10.

  Protrusions 11 in the axial direction are provided at both ends of each of the column parts 8, and both sides of the protrusions 11 are flat in the circumferential direction (the circumferential direction of the side plate 7). A base portion 14 is integrally provided on the column portion 8 side.

  As shown in FIG. 3A, the base portion 14 is provided with a radial width b smaller than a radial width c of the insertion holes 12 of the side plates 7 and 9. Both side surfaces of the head portion 13 become both side surfaces in the radial direction of the head portion 13 through a tapered portion 15 formed so as to spread toward the tip portion. The radial width d of the head 13 is formed to be larger than the radial width c of the insertion hole 12 of each side plate 7, 9 by a required tightening allowance. Chamfered.

  When the protrusion 11 is fitted into the insertion hole 12 of the side plate 9, as shown in FIG. 4, both tapered portions 15 of the protrusion 11 are formed at positions where the peripheral edge of the insertion hole 12 is engaged. Are engaged with both tapered portions 15. For this reason, in the state where the projection 11 is fitted into the insertion hole 12, the fitting between the taper portion 15 of the projection 11 and the insertion hole 12 is an interference fit (see FIG. 3B).

  Since the projection 11 and the insertion hole 12 of the side plate 9 are fitted together by an interference fit, the column portion 8 is positioned with respect to the side plate 9, and when the projection of the column portion 8 is crimped, the column portion 8 is inclined or twisted. Can be prevented.

  Further, in a state where the peripheral portions of the insertion hole 12 are engaged with both the tapered portions 15, the peripheral portion of the insertion hole 12 receives a force F (a force for expanding the peripheral portion) from the tapered portion 15. This force F can be broken down into an axial component force F1 and a radial component force F2, and the side plate 9 is pressed against the column portion 8 by the action of the axial component force F1.

  By this pressing, the axial displacement of the side plate 9 can be prevented, and the frictional force between the other end surface 17 of the side plate 9 and the column portion 8 is increased. The increase in the frictional force increases the strength against the radial load of the column portion 8 of the cage 6 during the bearing operation (the load when the cylindrical roller 5 hits the column portion 8 during operation).

  In addition, a gap e is provided between the both side surfaces of the base portion 14 in the radial direction and the inner side surface of the insertion hole 12, and the presence of the gap e allows a machining dimension error in the radial direction between the protrusion 11 and the insertion hole 12 to be allowed. Is done. Furthermore, when the peripheral part of the insertion hole 12 engages with both the taper parts 15, the position shift of the side plate 9 in the radial direction can be prevented. In addition, since the effect | action and effect about the fitting with the insertion hole 12 of the side plate 7 and the protrusion 11 of the column part 8 become the same as the fitting with the side plate 9 and the column part 8, it abbreviate | omits.

  Next, another embodiment of the present invention is shown in FIG. In this embodiment, as shown in FIG. 5 (a), a fitting recess 19 is provided on the peripheral edge of the insertion hole 12 in the other end surface 17 of the pair of side plates 7, 9, and axially around the protrusion 11 of the column portion 8. The embodiment is different from the above-described embodiment (see FIG. 2) in that the reinforcing step portion 21 is formed so as to be fitted in the fitting recess portion 19. Other configurations are the same as those of the above-described embodiment.

  As shown in FIG. 5A, the fitting recess 19 of this embodiment is provided in a square cross section, and the depth (axial depth) of the reinforcing step portion 21 formed around the protrusion 11. It is larger than the protruding height. The reinforcing step portion 21 is formed in a shape (cross-sectional square shape) that fits and fits into the fitting recess 19.

  When the insertion hole 12 of the side plate 9 is fitted to the protrusion 11 of each column part 8, the fitting concave part 19 is fitted to the reinforcing step part 21, as shown in FIG. By this fitting, the reinforcing step portion 21 receives the radial load of the column portion 8 of the cage 6 during the bearing operation (the load when the cylindrical roller 5 hits the column portion 8 during operation). The strength against shearing stress acting on the column portion 8 side portion can be improved.

  Further, a radial gap f and an axial gap g are formed between the fitting recess 19 and the reinforcing step portion 21 by fitting the protrusion 11 with the insertion hole 12. At this time, the radial clearance f between the fitting recess 19 and the reinforcing step portion 21 is set to be smaller than the radial clearance e between the inner side surface of the insertion hole 12 and the side surface of the base portion 14 of the protrusion 11.

  By setting in this way, when the radial position between the insertion hole and the protrusion is displaced during the bearing operation, the reinforcing stepped portion 21 abuts against the radially inner surface of the fitting recess 19, so that the positional displacement is reduced. It can be kept small.

  Furthermore, if the axial gap g is formed between the fitting recess 19 and the reinforcing step portion 21, the side plate 9 and the column portion 8 are brought into contact with each other. Since the pressing force F <b> 1 (see FIG. 4) in the axial direction of the side plate 9 acts on the column portion 8 instead of the reinforcing step portion 21, the side plate 9 is reliably pressed against the column portion 8. In this embodiment as well, the operation and effect of the fitting between the insertion hole 12 of the side plate 7 and the protrusion 11 of the column portion 8 are the same as the fitting of the side plate 9 and the column portion 8, so that the description is omitted. To do.

(A) Sectional drawing which shows the use condition of the cage for cylindrical roller bearings of one Embodiment, (b) FIG.1 (a) Partially cutaway sectional view in the BB line Partially cut away exploded perspective view of the same cylindrical roller bearing retainer (A) Front view showing a state before fitting the same, (b) Front view showing a fitted state of the same. The principal part enlarged side view which shows the state which fitted together same as the above (A) Partial cutaway exploded perspective view of a cylindrical roller bearing retainer of another embodiment, (b) Main part enlarged side view showing a fitted state of the above

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Raceway surface 4 Raceway surface 5 Cylindrical roller 6 Cage 7 Side plate 8 Column 9 Side plate 10 Pocket 11 Protrusion 12 Insertion hole 13 Head 14 Base 15 Taper portion 16 End surface 17 End surface 19 Fitting recess 21 Reinforcement Step

Claims (5)

  It consists of a pair of annular side plates (7), (9) and a plurality of column portions (8) connecting these side plates (7), (9), and is provided at both ends of each column portion (8). Protrusions (11) in the axial direction are provided, and a plurality of insertion holes (12) for fitting the protrusions (11) of the pillars (8) in the circumferential direction of the side plates (7), (9) are formed at a constant pitch. A cylindrical roller bearing retainer in which the fitting between the projection (11) and the insertion hole (12) is an interference fit in a state where the projection (11) is fitted into the insertion hole (12).   The protrusions (11) of the pillars (8) have taper portions (15) that widen toward both ends in the radial direction toward the tip, and the protrusions (11) are fitted into the insertion holes (12). 2. The cylindrical roller bearing according to claim 1, wherein a peripheral edge portion of the insertion hole (12) of the one end face (16) of each of the side plates (7) and (9) engages with the tapered portion (15). Cage.   A fitting recess (19) is formed in the peripheral edge of the insertion hole (12) on the other end face (17) of each side plate (7), (9), and around the protrusion (11) of the column (8). The cylindrical roller bearing retainer according to claim 1 or 2, wherein a reinforcing step portion (21) protruding in the axial direction is provided, and the reinforcing step portion (21) is fitted in the fitting recess (19).   The gap (f) in the radial direction between the fitting recess (19) and the reinforcing step (21) is the inner side of the insertion hole (12) and the side of the protrusion (11) on the side of the column (8). The cylindrical roller bearing retainer according to claim 3, which is smaller than the radial clearance (e).   The cylindrical roller bearing retainer according to claim 3 or 4, wherein an axial gap (g) is provided between the fitting recess (19) and the reinforcing step portion (21).

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