JPS6217418A - Method of fitting wear-resisting sleeve - Google Patents

Abstract

PURPOSE:To prevent abnormal abrasion by forming an engaging portion of a shaft and sleeve in polygon-shape to have a self-aligning function. CONSTITUTION:A shaft 2 and a sleeve 3 are engaged with each other in such a manner as to be polygonal in section. Though there is a clearance between the shaft and the sleeve because of clearance fit, the shaft and the sleeve can keep the concentricity with respect to the axis O in the state of rotating by DELTAthetain the respective rotating directions. Thus, the concentricity of the shaft and the sleeve can be ensured without interference fit to reduce vibration and abrasion of the shaft.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for attaching a wear-resistant sleeve to a sliding part of a rotating shaft, which requires both wear resistance and corrosion resistance, and is particularly applicable to corrosive fluids such as seawater pumps. The present invention relates to a method of attaching a wear-resistant sleeve suitable for a machine that handles the wear-resistant sleeve.

[Background of the invention]

The shaft material of pumps that handle corrosive fluids such as seawater uses materials such as austenitic stainless steel with relatively low hardness and poor wear resistance, so a sleeve with excellent wear resistance is installed on the sliding part. However, since the sleeve is often made of a material with poor strength and toughness such as ceramics, it is difficult to make a perfect fit between the shaft and the sleeve, and it is usually difficult to make a perfect fit using a key etc. This is often the case.

Therefore, a gap is created between the shaft and the sleeve (this gap is exacerbated by wear over time), and this gap directly causes rotational imbalance, resulting in an increase in shaft vibration.

The increase in shaft vibration accelerates the wear of sliding surfaces and mating parts, which may eventually lead to accumulation of rotating bodies. A related example of this type of sleeve is, for example, Japanese Patent Application Laid-open No. 59-29814.

[Purpose of the invention]

An object of the present invention is to provide a wear-resistant sleeve that has both wear resistance and corrosion resistance and is less likely to cause rotational vibration.

[Summary of the invention]

In the present invention, by making the cross-sectional shape perpendicular to the axis of the shaft-sleeve mating part polygonal (rice ball shape), there is an intransitive centering effect even though it is not an interference fit, so that the shaft and sleeve are concentric. The aim is to ensure that the degree of

This makes it possible to prevent an increase in shaft vibration and the accompanying abnormal wear.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. In this embodiment, rotor 1. It has a structure in which a shaft 2 having an impeller 5 is supported by a bearing 4.

The shaft 2 and sleeve 3 are shown in Fig. 2, which shows the A-A cross section of the bearing part.
are tightly connected in the polygon cross section, and since the tight fit is a clearance fit, a gap is created, but concentricity with respect to the axis ○ can be maintained while mutually rotated by Δθ in one rotation direction. .

In this example, the shaft 2 is made of oitenitic stainless steel, and the sleeve 3 is made of ceramics. The former has low strength, and the latter has low toughness, and there is a risk of damage if fastened with a key, etc., but a joint with a polygon cross section has a large effect of improving strength.

〔Effect of the invention〕

According to the present invention, concentricity between the shaft and the sleeve can be ensured without interference fit, so vibrations and wear of the shaft can be reduced.

In addition, in the case of an interference fit or a key joint, the strength of the sleeve and shaft is reduced, but in the case of a polygonal cross section as in the present invention, the reduction in strength is small, and this is particularly effective when using a ceramic sleeve.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an embodiment of the present invention, and Figure 2 is A of Figure 1.
-A sectional view. 1... Rotor, 2... Shaft, 3... Sleeve, 4...
... Bearing, 5... Impeller.

Claims (1)

[Claims] In the sliding part of the shaft, which consists of a shaft body and a wear-resistant sleeve mated to the outer surface of the shaft, the shaft-perpendicular cross-sectional shape of the mating surface between the shaft outer surface and the inner surface of the sleeve is polygonal. How to install the sex sleeve.