JP5050477B2 - Double row tapered roller bearing unit - Google Patents

Description

  The present invention relates to a double-row tapered roller bearing unit, and in particular, rotatably supports rotating members of various industrial machines such as a cylinder for a printing press and a roller shaft (rotating shaft) of a rolling mill on a fixed portion such as a frame. The present invention relates to a double row tapered roller bearing unit applied to a rotation support portion.

  In an offset printing machine, a plate cylinder, a rubber cylinder, and an impression cylinder are arranged side by side. At the time of printing, the rubber cylinder is in contact with the outer periphery of the plate cylinder and the impression cylinder, and the print image transferred from the plate cylinder is transferred to the impression cylinder. Are printed on printing paper that passes between the two. In addition, when paper is jammed due to printing trouble, etc., these three cylinders must be spaced apart from each other, and the rubber cylinder axis should be separated from the plate cylinder and impression cylinder axes. The cylinder ink is prevented from being transferred to the printing paper, and the jammed paper is discharged.

  As a device for rotatably supporting such a rubber cylinder, a double-row double-row tapered roller bearing unit shown in FIGS. 6 and 7 is known (for example, see Patent Document 1). The double row tapered roller bearing units 100 and 100 ′ shown in FIGS. 6 and 7 include an outer bearing 101 and an inner bearing 102, and constitute an inner ring raceway surface 103 of the outer bearing 101 and an outer ring raceway surface 104 of the inner bearing 102. Since the intermediate wheel 105 is formed eccentrically with respect to the axial center of the rubber cylinder, the above-described operation of the rubber cylinder is allowed and high-speed rotation is possible. In addition, the outer bearing 101 and the inner bearing 102 are each composed of a combination of the back surfaces to improve bearing rigidity.

In the double row tapered roller bearing unit 100 shown in FIG. 6, the intermediate ring 105 is constituted by a pair of split rings 105 a and 105 b that are divided into two at the axial center position. Further, in the double-row tapered roller bearing unit 100 ′ shown in FIG. 7, the intermediate ring 105 has an integral structure as shown in FIG. 8, while the outer ring 106 and the tapered roller are made easy to assemble the outer bearing 101. A cage 108 in which 107 is incorporated is divided into two in the circumferential direction.
JP 2004-108572 A

  By the way, it is necessary to regulate the preload of the double row tapered roller bearing units 100 and 100 ′ supporting the rubber cylinder to an appropriate value for the following reason. That is, if the preload is too low and the rigidity of the double-row tapered roller bearing units 100 and 100 'is insufficient, the displacement of the cylinder of the printing press cannot be suppressed, and the printing quality deteriorates, such as occurrence of shocks and doubles. . On the other hand, if the preload is too high, the rolling fatigue life of the inner ring, the outer ring raceway and the rolling surfaces of the tapered rollers will be reduced, and the durability of the double row tapered roller bearing units 100 and 100 'will be insufficient.

  In the double-row tapered roller bearing units 100 and 100 'shown in FIGS. 6 and 7, since the outer ring spacers are adjusted, it is necessary to prepare a plurality of spacers having different widths or to additionally process the spacers. The preload management was very troublesome.

  Further, in the double-row tapered roller bearing unit 100 shown in FIG. 6, since the intermediate ring 105 is divided into two parts, the accuracy of the butting surfaces of the divided rings 105a and 105b is required, and the processing becomes complicated. . Further, in the double row tapered roller bearing unit 100 ′ shown in FIG. 7, the outer ring 106 and the cage 108 are divided into two parts by being formed into an annular shape and then cut, and the processing is complicated. It takes time to assemble the frame.

  Furthermore, when it is necessary to readjust the preload for some reason after the bearing is mounted on the shaft, the double row tapered roller bearing unit 100 in FIG. 6 needs to be disassembled, and the double row tapered cone in FIG. In the case of the roller bearing unit 100 ′, it is necessary to break the spacer, which is a difficult task.

  The present invention has been made in view of the circumstances as described above, and has an object of having good assembly accuracy, easy processing, and easy preload management and preload readjustment. The object is to provide a double row tapered roller bearing unit.

The above object of the present invention is achieved by the following configurations.
(1) An integrated outer ring member formed with a double-row outer ring raceway having a conical concave shape that is inclined in a direction in which the inner diameter increases toward the end in the axial direction on the inner circumferential surface, and each outer circumferential surface An outer inner ring member having a pair of outer inner ring elements forming a partially conical convex inner ring raceway, and a plurality of tapered rollers provided between the outer ring raceways and the inner ring raceways. An outer bearing comprising;
An integral inner outer ring member that is eccentrically formed by forming another outer ring raceway in a double row that is a partial conical concave shape inclined in a direction in which the inner diameter increases toward the axial end on the inner peripheral surface, An inner ring member having a pair of inner ring elements formed with other inner ring raceways having a conical convex shape on the outer peripheral surface of the inner ring ring, and freely rollable between the other outer ring raceways and the other inner ring raceways. An inner bearing comprising a plurality of tapered rollers provided;
A double-row tapered roller bearing unit having a double structure,
An inner ring spacer is disposed between the pair of outer inner ring elements,
The pair of outer inner ring elements are fitted into the inner outer ring member with a clearance fit, with the end portions of the inner ring raceways having the smaller outer diameters facing each other via the inner ring spacer. It is, and,
The pair of outer inner ring elements are formed by an outward flange-shaped flange formed on the outer peripheral surface of one end of the axially opposite ends of the inner outer ring member and a holding member attached to the other end. The double-row tapered roller bearing unit is fixed to the inner outer ring member with an interference fit by applying a pressing force from both sides in the axial direction and preload is applied to each tapered roller.
(2) The inner outer ring member is made of bearing steel in which a screw hole for screwing the restraining member is formed on an axial end surface thereof.
The double inner row according to (1), wherein the inner outer ring member is formed by subjecting the other outer ring raceway and the outer peripheral surface to induction hardening or polishing the screw holes after quenching. Tapered roller bearing unit.
(3) The inner outer ring member is made of carburized steel in which a screw hole for screwing the restraining member is formed on an axial end surface thereof.
The double-row tapered roller bearing unit according to (1), wherein the screw hole of the inner outer ring member is subjected to a carbon-proof treatment.
(4) The holding member is a holding nut that is screwed to the other end of the inner outer ring member and whose tightening amount is regulated by the inner ring spacer disposed between the pair of outer inner ring elements. double row tapered roller bearing unit according to (1) that there is.
(5) In the state in which the outer outer ring member is fitted into the frame with a clearance fit, and the pair of inner inner ring elements are constrained by the shaft portion, the pair of outer inner ring elements is connected to the flange portion of the outward flange shape. The double row tapered roller bearing unit according to (1), wherein a pressing force is applied from both sides in the axial direction by the holding member, whereby the outer outer ring member is fixed to the frame with an interference fit.

According to the double-row tapered roller bearing unit of the present invention, the outer outer ring member and the inner outer ring member are integrally formed, a pair of outer inner ring elements are fitted on the inner outer ring member, and both outer inner ring elements are formed on the inner outer ring. By applying a pressing force from both sides in the axial direction by the outward flange-shaped flange portion formed on the outer peripheral surface of one end portion of the both axial end portions of the member and the holding member attached to the other end portion. Since the preload is applied to each tapered roller, it has a good assembly accuracy, is easy to process, and can easily manage the preload.
Further, when preload readjustment is necessary after the double row tapered roller bearing unit is attached to the shaft, it is also possible to insert a shim between the holding member and the inner ring.

  Hereinafter, a double row tapered roller bearing unit according to each embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 shows a double row tapered roller bearing unit according to a first embodiment of the present invention. The double-row tapered roller bearing unit 1 supports a shaft portion of a cylinder of a printing machine such as a rubber cylinder rotatably on the inner diameter side of a frame having a cylindrical inner peripheral surface, like the conventional one. A rotation support portion is configured to which a large radial load and thrust load are applied (the rigidity in the radial direction and the thrust direction needs to be sufficiently high).

The double row tapered roller bearing unit 1 is configured in a double structure including an outer bearing 2 and an inner bearing 3 that are combined in the back surface. The outer bearing 2 is fitted into a frame (not shown) and forms double-row outer ring raceways 11 and 11 each having a conical concave shape inclined in a direction in which the inner diameter increases toward the axial end on the inner peripheral surface. The outer ring member 12 and the outer ring member 15 provided with a pair of outer ring elements 14 and 14 each having a partially tapered convex inner ring raceway 13 and 13 formed on the outer peripheral surfaces thereof. , 11 and the inner ring raceways 13, 13, a plurality of tapered rollers 16, 16 provided so as to be freely rollable, and cages 17, 17 for holding the respective tapered rollers 16, 16 so as to be rollable. Is provided.

  The pair of outer inner ring elements 14, 14 are arranged with a gap in the axial direction with the small diameter side ends of the inner ring raceways 13, 13 facing each other. A small-diameter side flange 18 is formed on the outer peripheral surface of the side end portion, and a large-diameter side flange portion 19 is formed on the outer peripheral surface of the large-diameter side end portion so as to sandwich the inner ring raceway 13 from both sides in the axial direction.

  A lubricating oil passage for feeding lubricating oil into the double-row tapered roller bearing unit 1 is provided at the intermediate portion in the axial direction of the outer ring member 12 between the double-row outer ring raceways 11, 11. May be.

  The inner bearing 3 is eccentrically formed by forming other outer ring raceways 21 and 21 having double conical concave shapes inclined in a direction in which the inner diameter increases toward the axial end portion on the inner peripheral surface. A pair of inner inner rings 22 which are externally fitted to a body-shaped inner outer ring member 22 and a shaft portion (not shown) concentrically projecting from the cylinder, and which have other inner ring raceways 23 and 23 formed on the outer peripheral surfaces thereof. An inner inner ring member 25 having elements 24, 24, a plurality of tapered rollers 26, 26 provided between the other outer ring races 21, 21 and the other inner ring races 23, 23, respectively, And cages 27 and 27 for holding the tapered rollers 26 and 26 so as to roll freely.

  The pair of inner ring elements 24, 24 are also arranged in combination with the small diameter side ends of the other inner ring races 23, 23 facing each other, and the small diameter side ends of both the inner ring elements 24, 24 are arranged. A small-diameter flange 28 is formed on the outer peripheral surface, and a large-diameter flange 29 is formed on the outer peripheral surface of the large-diameter end, with the other inner ring raceway 23 sandwiched from both sides in the axial direction. Further, the inner outer ring member 22 has a wall thickness changed in the circumferential direction so as to change the axial center of the cylinder portion, as in the case of the conventional intermediate wheel, and the outer peripheral surface is the axial center of the shaft portion. Is formed eccentrically.

  Therefore, the double-row tapered roller bearing unit 1 is capable of high-speed rotation by supporting the rotation of the cylinder by the outer bearing 2 and the inner bearing 3, and the outer bearing 2 and the inner bearing 3 are each configured by a rear combination. Therefore, the bearing rigidity can be improved.

  The pair of outer inner ring elements 14, 14 are externally fitted to the inner outer ring member 22 with the end portions of the inner ring raceways 13, 13 on the side having the smaller outer diameter facing each other. Further, in order to preload each tapered roller 16, 16 of the outer bearing 2, an outward flange-like shape is formed on the outer peripheral surface of one end (left side in FIG. 1) of both end portions in the axial direction of the inner outer ring member 22. A collar 30 is formed. In addition, a holding member is attached to the other end (right side in FIG. 1). In the case of the present embodiment, a restraining ring 31 that is screwed and fixed to the other end face of the inner outer ring member 22 with a plurality of screws 33 is used as the restraining member. The amount by which the restraining ring 31 presses the outer inner ring element 14 near the other end is regulated by the restraining ring 31 coming into contact with the other end face of the inner outer ring member 22.

  As a result, the outer inner ring elements 14, 14 are respectively pressed by the outward flange-like flanges 30 and the retaining rings 31 of the inner outer ring member 22, so that a pressing force acts in a direction approaching from both sides in the axial direction. , 16 is applied with a desired preload (appropriate preload according to the application).

  The pair of outer inner ring elements 14, 14 are fitted on the inner outer ring member 22 with a clearance fit, and then the retaining ring 31 is screwed and fixed, and a pressing force acts on the outer inner ring elements 14, 14. It is fixed with an interference fit.

  Further, when the restraining ring 31 is used as the restraining member, it is necessary to process the screw hole 32 on the end face in the axial direction of the inner outer ring member 22, and therefore it is necessary to prevent cracking due to the threaded hole processing. For this reason, when the inner outer ring member 22 is bearing steel, the other outer ring raceways 21 and 21 and the outer peripheral surface, or portions other than the screw holes 32 may be subjected to induction hardening, or the inner The screw hole 32 may be polished after the outer ring member 22 is fully quenched. On the other hand, when the inner outer ring member 22 is carburized steel, the carburizing treatment is performed so that only the screw holes 32 are not carburized.

Therefore, in this embodiment, both the inner ring elements 8 and 8 are formed with an outward flange-shaped flange portion 30 and the other end portion formed on the outer peripheral surface of one end portion of both axial end portions of the inner outer ring member 22. Since a preload is applied to each tapered roller 16 and 16 by being pressed from both sides in the axial direction by a retaining ring (restraining member) 31 mounted on the double-row tapered roller bearing unit 1, It is possible to improve easiness and rotational accuracy and to improve the easiness of processing each constituent member.

  In particular, the double-row tapered roller bearing unit 1 of the present embodiment is formed by dividing the outer outer ring member and the inner outer ring member (intermediate ring) as an integrated type compared to the conventional double-row tapered roller bearing units 100 and 100 '. In addition, since it is not necessary to form a raceway surface on the outer peripheral surface of the inner outer ring member 22 formed eccentrically, it is excellent in assemblability, ease of preload management, and workability.

(Second Embodiment)
FIG. 2 shows a double-row tapered roller bearing unit according to the second embodiment. In the case of the double-row tapered roller bearing unit 1a of the present embodiment, a pair of restraining members (restraining rings) 31 are attached to both end portions of the inner outer ring member 22 in the axial direction, and both inner ring elements 14, 14 are disposed on both axial sides. The preload is applied to the tapered rollers 16 and 16 by being pressed from above.
Since the configuration and operation of other parts are the same as in the case of the first embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  In the case of the first and second embodiments, a shim is inserted between the retaining ring 31 and the outer inner ring element 14 when the preload readjustment is necessary after the double row tapered roller bearing units 1 and 1a are attached to the shaft portion. You may adjust by doing.

(Third embodiment)
FIG. 3 shows a double row tapered roller bearing unit of the third embodiment. In the case of the double row tapered roller bearing unit 1b of the present embodiment, an inner ring spacer 41 is disposed between the pair of inner ring elements 14 and 14.

For this reason, even when there is variation in the tightening force of the plurality of screws 33 for fixing the holding ring 31 with screws, the holding ring 31 can be prevented from being inclined and fixed by the inner ring spacer 41, and each tapered roller 16, The desired preload (appropriate preload according to the application) can be uniformly applied to the circumferential direction in 16 and the rotation accuracy can be further improved.
Since the configuration and operation of other parts are the same as in the case of the first embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

(Fourth embodiment)
FIG. 4 shows a double row tapered roller bearing unit of the fourth embodiment. In the case of the double-row tapered roller bearing unit 1c of the present embodiment, a holding nut 50 is used as a holding member. In this case, a thread groove 52 is formed on the outer peripheral surface of the end 51 near the other end of the inner outer ring member 22a, and a restraining nut 50 is screwed into the thread groove 52. Further, an inner ring spacer 53 is disposed between the pair of inner ring elements 14, 14 to restrict the tightening amount of the retaining nut 50 when screwing the retaining nut 50, and to the pair of outer inner ring elements 14. , 14 can also be kept good.

  Therefore, in the case of this embodiment in which the retaining nut 50 is screwed, compared to the first embodiment in which the retaining ring 31 is fixed by a plurality of bolts 33, each tapered roller 16, 16 has a desired preload (depending on the application). (Appropriate preload) can be applied more uniformly in the circumferential direction, and the rotation accuracy can be further improved. Moreover, since it is only necessary to screw the holding nut 50, the productivity is improved compared to the first embodiment, and it can be manufactured at a low cost.

Further, after the pair of outer inner ring elements 14 and 14 are fitted to the inner outer ring member 22 with a clearance fit, a pressing nut acts on the outer inner ring elements 14 and 14 by tightening the retaining nut 50 to the inner outer ring member 22a. It is fixed with an interference fit. Further, the outer outer ring member 12 fitted in a frame (not shown) with a clearance fit also moves outward in the radial direction by pressing the retaining nut 50 to the inner outer ring member 22, so that the interference fit is achieved. Fixed. In particular, by tightening the retaining nut 50 to the inner outer ring member 22a, the end 51 near the other end of the inner outer ring member 22a is slightly contracted, and the tapered inner rollers 26, 26 and the pair of inner inner ring elements 24, 24 are moved in the radial direction. Although a pair of inner inner ring elements 24, 24 are restrained by a shaft portion (not shown), the force to be pressed acts radially outwardly, and the outer outer ring member 12 is attached to the frame. Contributes to the tightening force when fixing to
Since the configuration and operation of other parts are the same as in the case of the first embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  As a modification of the present embodiment, in the double row tapered roller bearing unit 1d shown in FIG. 5, an inner ring spacer is disposed between the pair of outer inner ring elements 14 and 14, compared to the double row tapered roller bearing unit 1c. It is not configured. In this case, the tightening amount of the retaining nut 50 when screwing the retaining nut 50 may be determined by measuring the number of rotations of the retaining nut 50 and the actual preload amount.

  Note that the double-row tapered roller bearing unit of the present invention is not limited to that of the present embodiment, and can be appropriately modified and improved.

  The retaining member of the present embodiment may be any member that pre-loads each tapered roller 16, 16. In addition to the retaining ring 31 and the retaining nut 50, a retaining ring and a shim plate are used to place the retaining ring on the inner side. The shim plate may be disposed between the retaining ring and one inner ring element 14 by being engaged with the engaging groove near the other end of the outer peripheral surface of the outer ring member 22.

It is sectional drawing of the double row tapered roller bearing unit which concerns on 1st Embodiment of this invention. It is sectional drawing of the double row tapered roller bearing unit which concerns on 2nd Embodiment of this invention. It is sectional drawing of the double row tapered roller bearing unit which concerns on 3rd Embodiment of this invention. It is sectional drawing of the double row tapered roller bearing unit which concerns on 4th Embodiment of this invention. It is sectional drawing of the double row tapered roller bearing unit which concerns on the modification of 4th Embodiment of this invention. It is sectional drawing of the conventional double row tapered roller bearing unit. It is sectional drawing of the other conventional double row tapered roller bearing unit. It is an exploded view of the double row tapered roller bearing unit of FIG.

Explanation of symbols

1, 1a, 1b, 1c, 1d Double-row tapered roller bearing unit 2 Outer bearing 3 Inner bearing 11 Outer ring raceway 12 Outer outer ring member 13 Inner ring raceway 14 Outer inner ring element 15 Outer inner ring member 16 Tapered roller 21 Outer ring raceway 22 Inner outer ring member 23 Other inner ring raceway 24 Inner inner ring element 25 Inner inner ring member 26 Tapered roller 30 Gutter 31 Retaining ring (restraining member)
41, 53 Inner ring spacer 50 Retaining nut (Retaining member)

Claims (5)

An integrated outer outer ring member formed with a double-row outer ring raceway having a conical concave shape inclined in a direction in which the inner diameter increases toward the axial end on the inner peripheral surface, and a partial cone on each outer peripheral surface An outer bearing comprising an outer inner ring member including a pair of outer inner ring elements forming a convex inner ring raceway, and a plurality of tapered rollers provided between the outer ring raceways and the inner ring raceways. When,
An integral inner outer ring member that is eccentrically formed by forming another outer ring raceway in a double row that is a partial conical concave shape inclined in a direction in which the inner diameter increases toward the axial end on the inner peripheral surface, An inner ring member having a pair of inner ring elements formed with other inner ring raceways having a conical convex shape on the outer peripheral surface of the inner ring ring, and freely rollable between the other outer ring raceways and the other inner ring raceways. An inner bearing comprising a plurality of tapered rollers provided;
A double-row tapered roller bearing unit having a double structure,
An inner ring spacer is disposed between the pair of outer inner ring elements,
The pair of outer inner ring elements are fitted into the inner outer ring member with a clearance fit, with the end portions of the inner ring raceways having the smaller outer diameters facing each other via the inner ring spacer. It is, and,
The pair of outer inner ring elements are formed by an outward flange-shaped flange formed on the outer peripheral surface of one end of the axially opposite ends of the inner outer ring member and a holding member attached to the other end. The double-row tapered roller bearing unit is fixed to the inner outer ring member with an interference fit by applying a pressing force from both sides in the axial direction and preload is applied to each tapered roller. The inner outer ring member is made of bearing steel in which a screw hole for fixing the holding member to the axial end face is formed.
2. The double row according to claim 1, wherein the inner outer ring member is formed by subjecting the other outer ring raceway and the outer peripheral surface to induction hardening or polishing the screw holes after quenching. 3. Tapered roller bearing unit. The inner outer ring member is made of carburized steel in which a screw hole for fixing the holding member to the axial end face is formed,
The double row tapered roller bearing unit according to claim 1, wherein the screw hole of the inner outer ring member is subjected to a carbon-proof treatment. The restraining member is a restraining nut that is screwed to the other end of the inner outer ring member and whose tightening amount is regulated by the inner ring spacer disposed between the pair of outer inner ring elements. The double-row tapered roller bearing unit according to claim 1, wherein   The outer outer ring member is fitted into the frame with a clearance fit, and the pair of inner inner ring elements are constrained by a shaft portion, and the pair of outer inner ring elements are provided with the flanges facing outward and the restraint. 2. The double-row tapered roller bearing unit according to claim 1, wherein the outer outer ring member is fixed to the frame by an interference fit when a pressing force is applied from both sides in the axial direction by the member.

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