JPH1133873A - Telescope cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase lubricating performance even without any supply of oil and to reduce sliding resistance by making a wiper of an oil contained bearing material. SOLUTION: A telescope cover includes a plurality of cover units 1 combined to be relatively moved in a feeding direction indicated by an arrow, and a wiper 2 provided in a part where two cover units 1 are overlapped, and by the relative movements of the cover units 1, the entire telescope cover is extended/contracted in the feeding direction. The wiper 2 is made of an oil contained bearing material. Thus, the wiper 2 is used even without any supply of oil, and sliding resistance is small with no supplied oil. Further, good wear resistance, burning resistance and durability are provided at a high speed. Thus, a life is long and maintenance is easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic cover used for protecting a feed shaft and a guide portion of a feed shaft drive system in a machine tool, for example, and for preventing dust.

[0002]

2. Description of the Related Art A telescopic cover in a feed shaft drive system of a machine tool is composed of a plurality of cover units combined so as to be relatively movable and a wiper provided at a portion where the two cover units overlap. The conventional wiper is made of a resin material such as polyurethane.

For this reason, the feed speed is 20 to 30 m / mi.
n, there is no particular problem.
For high-speed feeding of up to 80 m / min, various problems have been raised in terms of wear resistance, lubricity, sliding resistance, durability and the like.

[0004] Telescope covers other than the feed shaft drive system of a machine tool have similar problems.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a wiper having excellent wear resistance and seizure resistance even when used at a high speed, a long life, and easy maintenance. To provide a telescopic cover.

[0006]

SUMMARY OF THE INVENTION A telescopic cover according to the present invention is provided at a portion where a plurality of cover units combined so as to be relatively movable and two cover units overlap. In a telescopic cover provided with a wiper, the wiper is made of an oil-impregnated bearing material.

Since the wiper is made of an oil-impregnated bearing material, it can be used without lubrication. Even without lubrication, the lubrication is high, the sliding resistance is low, and the wear resistance, seizure resistance, and durability at high speed are high. Excellent in nature. For this reason, the service life is long and maintenance-free.

Although various oil-impregnated bearing materials can be used, those having an allowable maximum speed of 70 m / min or more are desirable.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows a main part of a telescopic cover in a feed shaft drive system of a machine tool.

A telescopic cover is composed of a plurality of covers (1) combined so as to be relatively movable in a feed direction indicated by an arrow, and a wiper provided at a portion where the two covers (1) overlap. (2)
The relative movement of (1) causes the entire telescopic cover to expand and contract in the feed direction. The wiper (2) seals between the two overlapping cover units (1),
Each cover (1) is fixed to one end in the feed direction of the cover (1), and slides in close contact with the surface of the other cover (1) that overlaps. In addition, a locking projection (1a) is integrally formed at the other end in the feed direction of each cover unit (1), so that the two cover units (1) that overlap each other move relative to the extreme position. The wiper (2) of one cover (1) and the projection (1a) of the other cover (1) are engaged to prevent further relative movement. The maximum relative speed of the two covers (1) overlapping each other is equal to the feed speed.

The wiper (2) is made of an oil-impregnated bearing material. Therefore, it can be used without lubrication, and the sliding resistance is small even without lubrication. Moreover, it is excellent in wear resistance, seizure resistance and durability at high speed. Therefore, the service life is long,
Easy maintenance.

As an oil-impregnated bearing material, for example, OILES DRYMET (registered trademark) of OILES CORPORATION is used. In that case, the maximum allowable load is 300 without lubrication.
kgf / cm2, and the maximum allowable speed is 100 m / min, and it is possible to cope with high speed.

The overall structure of the telescopic cover, a single cover
The configuration of (1), the configuration of the wiper (2), and the like are not limited to those of the above-described embodiment, and can be appropriately changed. The present invention can also be applied to a telescopic cover other than the feed shaft drive system of the machine tool.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a configuration of a main part of a telescopic cover.

[Explanation of symbols]

 (1) Cover only (2) Wiper

Claims (1)

[Claims] 1. A telescopic cover comprising a plurality of cover units combined so as to be relatively movable and a wiper provided at a portion where the two cover units overlap, wherein the wiper is an oil-impregnated bearing material. Telescopic cover characterized by comprising.