US 2015/0224553 A1 · GEAR SPINDLE AND OIL SEAL USED THEREIN

Abstract

Provided is a gear spindle that is optimal for reducing diameter, that is capable of maintaining adequate strength and a high torque transmission capacity, and that maintains the sealing properties of an oil seal and prevents said oil seal from being damaged during operation at a high rotational speed. In order to achieve this, outer cylinder gear sections (11) are each integrally formed on the inner peripheral surface of a spindle outer cylinder ((10), more specifically a large-diameter cylinder section (10a)) and inner cylinder gear sections (14) are each integrally formed on the outer peripheral surface of a spindle inner cylinder (13), and an oil seal (27) that seals in the lubricating oil (20) for each of the aforementioned gear sections comprises: a seal body (29) that has a channel-shaped cross section and that is interposed in the peripheral gap between the inner peripheral surface of the spindle outer cylinder ((10), more specifically the large-diameter cylinder section (10a)) and the outer peripheral surface of the spindle inner cylinder (13); and a seal mounting member (30) that comprises a band, a spring, or the like that tightens and fixes the seal body to the outer peripheral surface of the spindle inner cylinder (13) such that expansion of the seal body in the axial direction is possible in the aforementioned peripheral gap.

Claims13

Dependent claims

1-15. (canceled)

A gear spindle including an outer-cylinder portion with a gear portion carved on an inner peripheral surface thereof and an inner cylinder portion with a gear portion carved on an outer peripheral surface thereof, the gear portions meshing with each other, the gear spindle being configured to be used in a rolling mill and to rotate with shaft axes of the outer cylinder portion and the inner cylinder portion being slanted relative to each other at a slant angle θ, characterized in that

the gear portion of the outer cylinder portion is formed integrally with the inner peripheral surface thereof, while the gear portion of the inner cylinder portion is formed integrally with the outer peripheral surface thereof, and
an oil seal configured to seal a lubricating oil for the gear portions includes
a seal body interposed in a peripheral gap between the inner peripheral surface of the outer cylinder portion and the outer peripheral surface of the inner cylinder portion, and
a seal attachment member configured to tighten securely and fix the seal body to the outer peripheral surface of the inner cylinder portion such that the seal body is expandable in the peripheral gap between the inner peripheral surface of the outer cylinder portion and the outer peripheral surface of the inner cylinder portion,
the seal body has an outer ring portion in surface contact with the inner peripheral surface of the outer cylinder portion, an inner ring portion in surface contact with the outer peripheral surface of the inner cylinder portion, and an intermediate ring portion connecting the outer ring portion and the inner ring portion to each other, the intermediate ring portion having a shape recessed to the lubricating oil side in such a manner as to be capable of receiving pressure of the lubricating oil,
the seal attachment member is placed on a side having the lubricating oil,
on the lubricating oil side, an annular groove is formed on the outer peripheral surface of the inner cylinder portion, the annular groove being configured such that an annular protruding portion formed on an inner peripheral surface of the inner ring portion is fitted into the annular groove to position the seal body in an axial direction, and
the outer ring portion is fixed in the axial direction.

5 more elements

Dependencies are inferred from the claim text.

Gear spindle and oil seal used therein

Life of this patent

Gear spindle and oil seal used therein

Life of this patent

Abstract

Claims13