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A fluid hydrodynamic bearing

A fluid dynamic pressure bearing and fluid dynamic pressure technology, applied in sliding contact bearings, bearings, bearings in rotating motion, etc., can solve problems such as insufficient load capacity and insufficient rigidity, and achieve high rotational accuracy and load capacity, and improved quietness. Effect

Active Publication Date: 2017-04-26
SANKYO SEISAKUSHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cam followers of such rolling bearings are used in cam mechanisms, such as roller gear cam mechanisms, roller cam mechanisms, etc., but the outer diameter of the outer ring is restricted due to the positional relationship with the cam, resulting in insufficient rigidity or insufficient load capacity. tendency

Method used

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  • A fluid hydrodynamic bearing
  • A fluid hydrodynamic bearing
  • A fluid hydrodynamic bearing

Examples

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Embodiment Construction

[0050] Hereinafter, examples of the present invention will be described with reference to the drawings, but the present invention is not limited to these examples.

[0051] refer to Figure 1-19 , an embodiment of the fluid dynamic bearing of the present invention and an embodiment of the cam mechanism constituting the fluid dynamic bearing of the present invention will be described.

[0052] figure 1 A cross-sectional view of the fluid dynamic pressure bearing 101 is shown. The fluid dynamic pressure bearing 101 includes a shaft member 104, an outer ring portion 102 rotatable along an outer peripheral surface 107 of the shaft member 104, and a diameter is provided between the outer peripheral surface 107 of the shaft member 104 and the inner peripheral surface 120 of the outer ring portion 102. To the gap 103. exist figure 1 Among them, the fluid dynamic pressure bearing 101 further includes: an insertion portion 105 for fitting the fluid dynamic pressure bearing 101 to a...

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Abstract

The present invention provides an excellent fluid hydrodynamic bearing high in rotational precision and load capacity and low in torque. The hydrodynamic bearing (101) includes a shaft member (104) and an outer ring portion (102) rotatable relative to the shaft member (104). A radial gap (103) is provided between the shaft member (104) and the outer ring portion (102), and the outer peripheral surface (107) of the shaft member (104) includes a first surface area (108), a second surface area (109) and a first fluid dynamic pressure holding region (110). A dynamic pressure groove (111) is formed in the first surface area (108), so that in the case where the outer ring portion (102) is rotated from the first surface area (108) to the second surface area (109) through the first fluid dynamic pressure holding area (110) with respect to the shaft member (104), in the first load-bearing region located on the first fluid dynamic pressure holding region (110) in the radial gap (103), dynamic pressure is generated from the first surface region (108) to the first fluid dynamic pressure holding region (110).

Description

technical field [0001] The present invention relates to a hydrodynamic bearing having high rotational accuracy and load capacity, and excellent low torque performance. Background technique [0002] There is known a cam follower of a rolling bearing including a cylindrical outer ring, a stud inserted into the outer ring in the axial direction, and a roller rolling between the outer ring and the stud as the outer ring rotates. Among them, there is a cam follower with a cage for keeping the rolling roller, and a cam follower with a total roller shape that does not use a cage. Cam followers of such rolling bearings are used in cam mechanisms, such as roller gear cam mechanisms, roller cam mechanisms, etc., but the outer diameter of the outer ring is restricted due to the positional relationship with the cam, resulting in insufficient rigidity or insufficient load capacity. tendency. Therefore, by using a cam follower of a sliding bearing instead of a cam follower of a rolling ...

Claims

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Application Information

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IPC IPC(8): F16C17/02F16C33/04
CPCF16C17/026F16C33/04F16C17/02F16C33/10F16C33/107
Inventor 胜又一久安达健郎
Owner SANKYO SEISAKUSHO
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