JP2007154967A - Rolling bearing device with preload adjusting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust the preload even after assembly of a device by incorporating a preload adjusting mechanism with a simple structure while basically taking the form of fixed position preload. <P>SOLUTION: Inner rings 2 are attached to a roll shaft 5 (barrel), and is fixed by an inner ring fixing nut 6. Outer rings 1a and 1b are attached to an intermediate housing 7. An end of the outer ring 1a on a gear side extends to the gear side in an axial direction, and an outer ring position adjusting screw 8 is formed on its end. A position adjusting nut 9 screwed with the outer ring position adjusting screw 8 is rotatably provided on a gear side end of the intermediate housing 7. The non-rotational outer ring position adjusting screw 8 can be moved to the axial direction by rotating and adjusting the position adjusting nut 9 during adjustment of the preload. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rolling bearing device with a preload adjusting mechanism used for a printing roll of a printing machine, for example, a use requiring high rotational accuracy and bearing rigidity among general industrial devices.

  As a mechanism for applying preload to rolling bearings, fixed position preload is applied by adjusting the axial positional relationship between the inner ring and outer ring of the bearing using a spacer or the like that controls the width between the bearings. In general, a method using a constant pressure preload in which a preload is applied using a spring or the like installed on the raceway is common.

  However, in the case of fixed position preload, it is necessary to precisely position the bearings prior to assembly, and there are deformations of the race ring due to the fit during assembly. The design is complicated, such as having to make settings.

  Although the fixed position preload is simple in terms of mechanism, the initial preload will decrease due to initial wear of the components as the internal wear of the bearing progresses in the initial stage of operation after incorporation into the device. Therefore, it is difficult to accurately obtain the target bearing performance.

  On the other hand, in the case of constant pressure preload, since the preload is applied from the outside of the bearing by a spring or the like, the phenomenon of the preload loss as seen in the decrease of the initial preload in the fixed position preload is greatly relieved. The position setting need not be as strict as the fixed position preload.

However, the mechanism for applying preload is complicated, and the amount of preload is determined by the elasticity of the spring, so if a higher amount of preload is required, a more complicated preload application mechanism must be used. .
Japanese Patent Laid-Open No. 7-24604 JP 2002-364661 A JP 2002-54630 A JP 2001-140876 A

  The present invention has been made in view of the above-described circumstances. Basically, a preload adjusting mechanism having a simple structure is incorporated while taking the form of a fixed position preload, so that the preload can be performed even after the assembly of the apparatus. An object of the present invention is to provide a rolling bearing device with a preload adjusting mechanism that can be adjusted.

In order to achieve the above object, the rolling bearing device with a preload adjusting mechanism according to the present invention has a rolling element interposed between a pair of race rings so as to be freely rollable, and uses preload adjustment by applying preload. In rolling bearing device with mechanism,
A clearance adjustment mechanism using a screw is added to a part of the raceway, and preload adjustment is possible even after being incorporated into the device.

  Preferably, the rolling bearing device with a preload adjusting mechanism is a tapered roller bearing used for a printing roll of a printing machine.

  According to the present invention, it is possible to adjust the preload even after the assembly of the apparatus by incorporating the preload adjusting mechanism having a simple structure while basically taking the form of the fixed position preload. For example, even if preload loss occurs with the operation of the apparatus, adjustment to an appropriate preload amount can be performed. Furthermore, the bearing rigidity can be ensured by the amount that can provide a high preload which is difficult with the constant pressure preload.

  That is, the preload applied to the bearing can be adjusted by allowing the bearing ring to move in the axial direction using a simple screw mechanism attached to the bearing ring. Thereby, even if a preload loss state occurs due to initial wear or the like, a necessary and appropriate preload can be obtained without disassembling the device. Conversely, if more preload than necessary is added, the rotational torque of the bearing will increase and the amount of heat generated will also increase, but by adjusting the preload to an appropriate amount according to the present invention, energy consumption for operating the device will be reduced. This contributes to reducing the size of cooling devices such as oil coolers attached to the device.

  Hereinafter, a rolling bearing device with a preload adjusting mechanism according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
1 is a cross-sectional view of a rolling bearing device with a preload adjusting mechanism applied to a roll shaft for a printing press according to a first embodiment of the present invention.

  In the present embodiment, generally, the tapered rollers 3 and 3 are interposed between the outer rings 1a and 1b and the inner rings 2 and 2 so as to freely roll, and the cages 4 and 4 are mounted, respectively. It is. The outer ring 1a is an outer ring with an adjusting screw.

  The inner rings 2 and 2 are mounted on a roll shaft 5 (body) and are fixed by an inner ring fixing nut 6.

  The outer rings 1 a and 1 b are attached to the intermediate housing 7. The end portion of the outer ring 1a on the gear side extends in the axial direction on the gear side, and an outer ring position adjusting screw 8 is formed on the inner diameter surface of the end portion. A position adjusting nut 9 screwed into the outer ring position adjusting screw 8 is rotatably provided at the gear side end of the intermediate housing 7. Reference numeral 11 denotes a detent pin, reference numeral 12 denotes an adjustment nut pressing snap ring, and reference numeral 13 denotes a main body frame.

  By rotating and adjusting the position adjusting nut 9 during the preload adjustment, the non-rotating outer ring position adjusting screw 8 can be moved in the axial direction as will be described in detail later.

  A spacer 2a is interposed between the inner rings 2 and 2, and a rib 7a of the intermediate housing 7 is formed on the radially outer side. The rib 7a is sandwiched between the outer rings 1a and 1b. As will be described in detail later, when the outer ring 1a on the gear side moves in the axial direction at the time of preload adjustment, between the rib 7a and the outer ring 1a, There may be gaps.

  This embodiment assumes the case where it is used for an impression cylinder of a printing press. In the case of a printing press, the preload loss may cause a decrease in roll rigidity, leading to a decrease in print quality.

  The bearing is a single row conical roller bearing outer ring back surface alignment, but even if this is an angular ball bearing outer ring back surface combination, the same mechanism can be used.

  A spacer 2a for restricting the distance between the inner rings 2 and 2 is attached between the combined inner rings 2 and 2, and the end of the roll shaft 5 is axially fixed by an inner ring fixing nut 6. Since it is tightened, stable attachment is possible without tilting with respect to the roll shaft 5.

  The bearing is generally attached to the main body frame of the printing press via the intermediate housing 7, and in this embodiment, the conventional apparatus structure is followed and can be replaced as it is. Is possible.

  A rib 7 a is provided on the inner diameter portion of the intermediate housing 7 in order to regulate the position of the outer ring 1 b of the roll-side bearing.

  A part of the outer ring 1a of the gear-side bearing is extended in the axial direction, and an outer ring position adjusting screw 8 is provided on the inner diameter surface of the extended portion. The outer ring position adjusting screw 8 is assembled with a position adjusting nut 9 for applying a preload. By rotating the position adjusting nut 9, the axial position of the outer ring 1a on the gear side can be adjusted. .

  When the outer ring 1 a rotates together with the rotation of the position adjusting nut 9, a pin or a key such as a detent pin 11 may be provided between the outer ring 1 a and the intermediate housing 7 to prevent the rotation.

  The fit between the outer ring 1a and the intermediate housing 7 is suitable to be slightly tighter than the intermediate fit. During adjustment of the preload, there is no hindrance to the outer ring 1a moving in the axial direction, and preload is applied. In the case of a tapered roller bearing, since the outer ring 1a is pushed by the tapered roller 3 and expands to the outer diameter side, there is no gap with the intermediate housing 7, and the outer ring 1a is fixed to the intermediate housing 7 properly. Stable unit installation is possible even when rigidity is required.

  The preload is set in the axial direction of a predetermined outer ring 1a that reaches the preload amount calculated in advance, with the point where the position adjustment nut 9 is tightened until the clearance inside the bearing is eliminated and the bearing internal space is eliminated. Adjustment may be performed by managing the rotation angle of the position adjusting nut 9 to the moving position.

  Since adjustment can be performed for each product, strict management in consideration of dimensional tolerances between fitting parts and deformation due to fitting is largely omitted, and the work efficiency of assembly is improved.

  The preload adjustment method may be set while checking the preload amount by a preload estimation method by detecting the rotational torque of the bearing or a method by measuring the resonance frequency of the shaft system.

  As for the assembly procedure, the main body frame is arranged on the left and right of the roll shaft 5 (body), the outer ring 1a and the intermediate housing 7 are inserted from the outside of the frame, the spacer 2a and the inner ring 2 are passed through the roll shaft 5, and the end face of the inner ring 2 Is completed with the inner ring fixing nut 6.

  Since it is not necessary to insert the intermediate housing 7 into the frame in a state where a preload is applied to the bearing, the outer diameter of the unit does not expand and it can be easily inserted into the hole of the main body frame.

  When the preload amount needs to be changed after the start of operation of the apparatus, such as correction of the preload loss due to initial wear or the like, the preload can be adjusted from the outside via the position adjusting nut 9.

  From the above, according to the present embodiment, it is possible to adjust the preload even after the assembly of the apparatus by incorporating the preload adjusting mechanism having a simple structure while basically taking the form of the fixed position preload. For example, even if preload loss occurs with the operation of the apparatus, adjustment to an appropriate preload amount can be performed. Furthermore, bearing rigidity can be ensured as much as high preload, which is difficult with constant pressure preload, can be applied.

  That is, by using a simple screw mechanism (8, 9) attached to the bearing ring (outer ring 1a), the bearing ring (outer ring 1a) can be moved in the axial direction to adjust the preload applied to the bearing. It can be so. Thereby, even if a preload loss state occurs due to initial wear or the like, a necessary and appropriate preload can be obtained without disassembling the device. Conversely, if more preload than necessary is added, the rotational torque of the bearing will increase and the amount of heat generated will also increase, but by adjusting the preload to an appropriate amount according to the present invention, energy consumption for operating the device will be reduced. This contributes to reducing the size of cooling devices such as oil coolers attached to the device.

(Second Embodiment)
FIG. 2 is a sectional view of a rolling bearing device with a preload adjusting mechanism applied to a roll shaft for a printing press according to a second embodiment of the present invention.

  In the present embodiment, the outer ring position adjusting screw 8 is provided on the inner diameter surface of the extension portion of the outer ring 1a in the first embodiment, but is provided on the outer diameter surface of the extension portion of the outer ring 1a. . Other configurations are the same as those of the first embodiment.

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

1 is a cross-sectional view of a rolling bearing device with a preload adjusting mechanism applied to a roll shaft for a printing press according to a first embodiment of the present invention. It is sectional drawing of the rolling bearing apparatus with a preload adjustment mechanism applied to the roll shaft for printing press concerning 2nd Embodiment of this invention.

Explanation of symbols

1a Outer ring with adjusting screw 1b Outer ring 2 Inner ring 2a Spacer 3 Tapered roller 4 Cage 5 Roll shaft (trunk)
6 Inner ring fixing nut 7 Intermediate housing 7a Rib 8 Outer ring position adjusting screw 9 Position adjusting nut 11 Non-rotating pin 12 Adjustment nut retaining snap ring 13 Body frame

Claims (2)

In a rolling bearing device with a preload adjusting mechanism, a rolling element is interposed between a pair of race rings so as to freely roll, and a preload is applied.
A rolling bearing device with a preload adjusting mechanism, wherein a gap adjusting mechanism using a screw is added to a part of the raceway, and preload adjustment is possible even after being incorporated into the device.   The rolling bearing device with a preload adjusting mechanism according to claim 1, wherein the roller bearing device is a tapered roller bearing used in a printing roll of a printing machine.

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