Fan Motor Cover

Specifications

How to choose Machine Element Components

Points to check when selecting, with the values for this product (99-0031〜99-0041).

1. 1. Select a width and height that fit the keyway

   The key width b and height h are paired according to standard dimensions matched to shaft diameter, and should be selected to suit the keyway dimensions on the shaft and the mating part (gear or pulley). The listed products have widths of 3 to 14 mm and heights of 3 to 9 mm. A loose width fit causes rattling, while a tight fit prevents assembly.

2. 2. Check height against keyway depth combination

   The key height h must be appropriate relative to the combined depth of the shaft keyway and the hub-side keyway. If it is too high, the mating part will not fit; if it is too low, the transmissible torque will be insufficient. Verify the nominal dimensions in the standard table together with the width.

3. 3. Determine length by hub length and transmitted torque

   The key length L should fall within the length of the gear or pulley hub (bore section), and should be determined by whether its shear and surface pressure strength are sufficient for the transmitted torque. The listed products have lengths of 10 to 80 mm. Also confirm that the end shape of double round or single round keys matches the shaft keyway shape (such as the round end produced by end-mill machining).

4. 4. Choose material to suit the operating environment

   This product: Material SWM-B (Iron wire)

   For general machinery, carbon steel such as S50C is used; for environments exposed to water or chemicals, and for food-related equipment, stainless steel such as SUS316 with high corrosion resistance is used. Pay attention to strength differences from key, shaft, and hub material combinations, and to corrosion caused by contact between dissimilar metals.

5. 5. Match covers to fan outer diameter

   This product: Outer diameter D 51〜154 mm

   For fan motor covers (fan guards), select a model that fits the outer diameter D of the fan being installed. The listed products have outer diameters of 51 to 154 mm. Also confirm the mounting hole positions and whether the surface treatment, such as trivalent chromate treatment, meets the corrosion resistance requirements of the installation environment.

6. 6. Check wire diameter and inner diameter for pins and springs

   This product: Wire diameter 1.2〜1.8 mm

   Pins and springs made from wire material vary in strength and spring force depending on wire diameter. The listed products have wire diameters of 1.2 to 1.8 mm and inner diameters of 27 to 31 mm. Select by verifying the dimensional relationship with the mating shaft or hole and whether the wire diameter suits the required load.

This guide was written by AI based on the listed products' documents and specification items.

About Machine Element Components and all products

Description

Electrogalvanized (trivalent chromium type). Some items are limited-stock products.

FAQ

Q. What are the material and surface treatment of the Fan Motor Cover (Model No. 99-0031 to 99-0041)?

A. The material is SWM-B (steel wire). It is electrogalvanized (trivalent chromium type) and finished with trivalent chromate treatment.

Q. What is the size range of the Fan Motor Cover (Model No. 99-0031 to 99-0041)?

A. Outer diameter D is 51 to 154 mm, inner diameter d is 27 to 31 mm, and wire diameter is 1.2 to 1.8 mm. There are 11 models with outer diameters of 51 to 154 mm.

Q. What are the main applications of the Fan Motor Cover (Model No. 99-0031 to 99-0041), and what should be noted about stock?

A. It is used for protecting fan motors. Some items are limited-stock products.

Written by AI based on the content of the source documents.

Source documents

• Catalog スプリングネット 製品カタログ（ページ抜粋） 43 pages Open page 15
  Found on: https://www.samini.co.jp/catalog_list/