JP2006183847A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for supporting a body of a printing machine, capable of stably setting an appropriate pre-load and of improving bearing accuracy and assembling performance. <P>SOLUTION: The bearing device 20 for supporting the body of the printing machine is provided with two outer rings 1 having raceway surfaces 1a on the inner diameter faces; an outside raceway member 21 integrally forming, by one member, an outer ring spacer 6 arranged between the two outer rings 1 and a housing 8 into which the two outer rings 1 are internally fitted; two inner rings 2 having raceway surfaces 2a on the outer diameter faces; and a plurality of rolling elements 3 arranged so as to be rolled between the respective raceway surfaces 2a of the inner rings 2 and the respective raceway surfaces 1a of the outside raceway member 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bearing device suitable for a cylinder support of a printing machine.

Since a bearing device for a cylinder support of a printing machine needs to completely constrain the degree of freedom of the cylinder for the purpose of increasing printing accuracy, the bearing and the housing are required to be rigid. Preload is applied.
For example, as shown in FIG. 5, a plurality of tapered rollers 3 as rolling elements are rolled via a cage 4 between an outer ring 1 and an inner ring 2. The single row tapered roller bearings 5 that are movably arranged are combined in the back of the two rows through the outer ring spacer 6 and the inner ring spacer 7 so that the two rows of outer rings 1 are fitted in the housing 8 and the two rows of inner rings. 2 is externally fitted to the shaft portion 10 of the trunk 9.

  The preload on the bearing portion is loaded by tightening the nut 11 screwed to the distal end side of the shaft portion 10 and pressing the inner ring 2 in the row on the distal end side of the shaft portion 10 in the axial direction. An outer ring presser 12 also serving as a seal member is attached to the end face facing the body 9 via a shim 13. In FIG. 5, reference numeral 14 denotes an oil hole that passes through the housing 8 and the outer ring spacer 6 and communicates with the bearing space.

By the way, when a preload is set for the bearing alone, a preload is applied, so that the bearing outer ring expands in the radial direction due to elastic deformation. On the other hand, when the preload is set by fitting the bearing 5 in the housing 8 as in the case of the conventional cylinder support bearing device of a printing machine, the expansion of the outer ring 1 is restricted by the housing 8 and the fitting with the housing 8 is performed. The outer ring 1 is in a contracted state due to the mating.
As described above, when the bearing alone and the bearing 5 are fitted in the housing 8, the setting of the preload is different. Therefore, when the setting of the preload cannot be performed with the bearing 5 installed in the housing 8 due to workability and the like. Etc. is a problem.

Further, when the amount of shrinkage and internal stress of the outer ring 1 changes due to the variation in the fitting accuracy between the outer diameter of the outer ring 1 and the inner diameter of the housing 8 and the variation in the preload increases, an appropriate preload can be ensured on the lower limit side. On the upper limit side, the preload becomes excessive, which adversely affects the bearing life.
Further, since the tolerances of the parts such as the housing 8, the outer ring retainer 12, and the bearing width dimension are stacked when the bearings are fixed in the axial direction, the tolerances of the parts are extremely reduced in order to ensure the required accuracy. Accurate machining is required or a presser position adjusting shim 13 is required.

Furthermore, in precision bearings that require high-precision rotation and mounting, when the bearing 5 is fixed to the housing 8 by an interference fit, the inner and outer diameters / The end face runout accuracy, roundness, and parallelism may be worse than in the case of a single bearing.
The present invention has been made to eliminate such inconveniences, and provides a bearing device capable of stably setting an appropriate preload, and improving bearing accuracy and assembling ability. The purpose is to do.

In order to achieve the above object, the invention according to claim 1 is a cylinder support bearing device for a printing machine, wherein two rows of outer rings having a raceway surface on an inner diameter surface, between outer rings arranged between the two rows of outer rings. An outer race member in which a seat and a housing into which the two rows of outer rings are fitted are integrally formed by one member, two rows of inner races having raceway surfaces on outer diameter surfaces, and each raceway surface of the two rows of inner races And a plurality of rolling elements arranged to roll freely between the raceway surfaces of the outer raceway member and the outer raceway member.
The invention according to claim 2 is characterized in that, in claim 1, it is used in a fixed position preload by a back surface combination.
According to a third aspect of the present invention, in the first or second aspect, the outer race member is provided with an oil hole communicating with the bearing space.

According to the present invention, two rows of outer rings having raceway surfaces on the inner diameter surface, outer ring spacers disposed between the two rows of outer rings, and a housing in which the two rows of outer rings are fitted are integrated into one member. Since it is formed as an outer race member, there is no need to consider the variation in the fitting accuracy between the outer diameter of the outer ring and the inner diameter of the housing, which is a factor that increases the variation in preload, and the expansion of the outer ring when preloading the bearing. Variation in preload can be reduced.
Also, since the outer ring and the housing are integrated as a single member, assembly work such as press-fitting the bearing outer ring into the housing and shrink fitting is unnecessary, and the outer ring is deformed and the coefficient of thermal expansion between the outer ring and the housing. It is possible to eliminate the variation of the fitting due to the difference.

As described above, an appropriate preload can be stably set, and variations in bearing accuracy can be greatly suppressed, thereby improving bearing accuracy.
Further, since the two rows of outer rings, the outer ring spacers disposed between the two rows of outer rings, and the housing into which the two rows of outer rings are fitted are integrally formed with one member, the bearing rigidity is increased. In addition, the number of parts can be reduced and the number of assembling steps can be greatly reduced, and the assembling property can be improved.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part for explaining a cylinder support bearing device for a printing machine, which is an example of an embodiment of the present invention. FIG. 2 is a drawing of the bearing device of FIG. FIG. 3 is a cross-sectional view of an essential part illustrating a state, FIG. 3 is a cross-sectional view of an essential part for explaining a cylinder support bearing device for a printing machine according to another embodiment of the present invention, and FIG. 4 is a printing machine for the bearing device of FIG. It is principal part sectional drawing which shows the state assembled in the axial part of the trunk | drum. In addition, about the part which overlaps with the conventional bearing apparatus already demonstrated in FIG. 5, the same code | symbol is attached | subjected and demonstrated to each figure.

  As shown in FIG. 1, a cylinder support bearing device 20 for a printing machine, which is an example of an embodiment of the present invention, includes an outer race member 21, and the outer race member 21 is a two-dot chain line in FIG. 1. Referring to FIG. 1, there are two rows of outer rings 1 having raceway surfaces 1a on the inner diameter surface, outer ring spacers 6 disposed between the two rows of outer rings 1, and a housing 8 in which the two rows of outer rings 1 are fitted. It is integrally formed of members. A plurality of tapered rollers 3 as rolling elements are provided between the raceway surfaces 1 a of the outer race member 21 and the raceway surfaces 2 a of the two rows of inner rings 2 in which the inner ring spacers 7 are interposed. It is arranged so as to be able to roll in the circumferential direction through the rear combination structure.

Further, the outer race member 21 is formed with an oil groove 22 that penetrates through a portion corresponding to the housing 8 and the outer ring spacer 6 and communicates with the bearing space. The outer peripheral shape of the outer race member 21 can be various shapes corresponding to the inner peripheral shape of the member 23 to be fitted, and is not necessarily limited to the cylindrical surface.
FIG. 2 shows a state in which two rows of the inner rings 2 of the bearing device 20 having the above-described configuration are incorporated into the shaft portion 10 of the cylinder 9 of the printing machine. A fixed position preload is applied by tightening the nut 11 and pressing the inner ring 2 in the row on the distal end side of the shaft portion 10 in the axial direction. A seal member 24 is attached to an end surface of the outer race member 21 facing the body 9 side.

  As is apparent from the above description, in this embodiment, the outer ring spacer 6 and the two rows of outer rings 1 disposed between the outer ring 1 in two rows and the outer ring 1 in two rows having the raceway surface 1a on the inner diameter surface are provided. Since the inner fitting housing 8 is formed integrally with one member to form the outer race member 21, the variation in the fitting accuracy between the outer diameter of the outer ring 1 and the inner diameter of the housing 8 and the bearing, which are factors that increase the variation in the preload. It is not necessary to consider the expansion of the outer ring 1 when preloading is applied to the portion, and the variation in preload can be reduced.

Further, since the outer ring 1 and the housing 8 are integrated as a single member, assembly work such as press-fitting of the bearing outer ring 1 into the housing 8 and shrink fitting is unnecessary, and the outer ring 1 is deformed and the outer ring 1 Fitting variation due to a difference in thermal expansion coefficient with the housing 8 can be eliminated.
As described above, an appropriate preload can be stably set, and variations in bearing accuracy are greatly suppressed, and can be applied mainly to precision bearings having bearing accuracy of ISO CLASS 5 or higher and ABMA CLASS 3 or higher.

Further, since the two rows of outer ring 1, outer ring spacer 6 and housing 8 are integrally formed from a single member, the bearing rigidity can be increased, and the number of parts can be reduced and the number of assembly steps can be greatly reduced. Thus, the assembling property can be improved.
Further, since the two rows of the outer ring 1, the outer ring spacer 6 and the housing 8 are integrally formed with one member, the outer ring presser is not required, and it is not necessary to provide the outer ring presser function on the seal member 24. The shim 13 for adjusting the presser position of the outer ring 1 shown in FIG. 5 is not necessary, and the assembly work can be shortened.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the above-described embodiment, the case where the inner ring spacer 7 is interposed between the two rows of the inner rings 2 is illustrated, but it is not always necessary to do this, and as shown in FIGS. The rows of inner rings 2 may be butted against each other, and a gap may be provided between the two rows of inner rings 2.
In addition, the material, shape, dimensions, form, number, location, etc. of the raceway surface, outer raceway member, inner ring, rolling element, oil hole, seal member, etc. exemplified in the above embodiment can achieve the present invention. It is arbitrary and is not limited.

It is principal part sectional drawing for demonstrating the cylinder support bearing apparatus of the printing machine which is an example of embodiment of this invention. It is principal part sectional drawing which shows the state which integrated the bearing apparatus of FIG. 1 into the axial part of the cylinder of a printing machine. It is principal part sectional drawing for demonstrating the cylinder support bearing apparatus of the printing machine which is other embodiment of this invention. It is principal part sectional drawing which shows the state which integrated the bearing apparatus of FIG. 3 in the axial part of the cylinder of a printing machine. It is principal part sectional drawing which shows the state which incorporated the conventional bearing device for cylinder support of a printing machine in the axial part of the cylinder of a printing machine.

Explanation of symbols

1 outer ring 1a raceway surface 2 inner ring 2a raceway surface 3 tapered roller (rolling element)
6 outer ring spacer 8 housing 20 bearing device 21 for cylinder support of printing machine outer race member 22 oil hole

Claims (3)

  An outer race member in which two rows of outer rings having raceway surfaces on the inner diameter surface, an outer ring spacer disposed between the two rows of outer races, and a housing into which the two rows of outer races are fitted are formed integrally with one member; Two rows of inner rings having raceway surfaces on the outer diameter surface, and a plurality of rolling elements arranged to roll freely between the raceway surfaces of the two rows of inner rings and the raceway surfaces of the outer race members, A bearing device comprising:   The bearing device according to claim 1, wherein the bearing device is used in a fixed position preload by a back surface combination.   The bearing device according to claim 1, wherein the outer race member is provided with an oil hole communicating with the bearing space.

Images