Spring Return Cord Reel Unit

Specifications

How to choose Power spring

Points to check when selecting, with the values for this product (Spring Return Cord Reel Unit).

1. 1. Check the required maximum torque

   For spiral springs and clock springs alone, check whether the rotational force needed to operate the mechanism is satisfied using the maximum torque. Listed products range from 1.09 to 12 N·m. Since torque varies with the amount of winding, check that the required torque is not below the listed value across the range of rotation angles used.

2. 2. Select an outer diameter that fits the storage space

   Outer diameter D is the outer diameter of the spring in its wound state, and determines whether it fits within the inner diameter of the case or housing it is installed in. Listed products range from 42 to 100 mm, and some free-size products can be manufactured to a specified outer diameter. Also allow for the extra space the spring occupies when unwound.

3. 3. Adjust torque and dimensions with thickness and width

   Even with the same outer diameter, the generated torque increases as the strip thickness t gets thicker and the strip width b gets wider. As thickness increases, the number of turns tends to decrease, reducing the rotation angle. Listed products have a strip thickness of 0.2 to 0.8 mm and a strip width of 5 to 16 mm, so also confirm that the strip width fits within the axial mounting width.

4. 4. Select units by cord output and stroke

   This product: Cord output 2.45 to 9.8 N

   For spring motor units, the selection criteria are the cord output, which is the force pulling the cord, and the stroke, which is the length over which the cord can be pulled out. Listed products have a cord output of 2.45 to 9.8 N and a stroke of 1500 mm. Check that the output is sufficient to reliably return the object during rewinding and that the stroke is long enough for the required pull-out length.

5. 5. Review service life against cycle count

   This product: Service Life 200,000 回

   Spring motors suffer breakage and loss of force from fatigue when repeatedly wound and unwound. For listed products, the guideline service life is 200,000 cycles. Estimate the required number of cycles from the expected usage frequency and service life of the equipment, and if this exceeds the guideline, determine a replacement interval.

6. 6. Choose a material suited to the operating environment

   Hard steel wire (such as SWRH 62A) and carbon tool steel are for general applications, and rust must be watched for in humid or wet environments. Where corrosion is a concern, consider stainless steel. Surface treatment and the presence or absence of grease also affect friction and corrosion resistance.

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

About Power spring and all products

Description

The cord output is available in 4 types, and the cord can be pulled out from 3 directions. The unit has 2 mounting surfaces, enabling space-saving installation.

FAQ

Q. What range can the cord output of the spring return unit be selected from?

A. The cord output ranges from 2.45 to 9.8 N, and you can choose from 4 types.

Q. In which directions can the cord of the spring return unit be pulled out?

A. The cord can be pulled out in 3 directions.

Q. What are the mounting surfaces and installation space requirements for the spring return unit?

A. The unit has 2 mounting surfaces and enables space-saving installation.

Q. What are the stroke and service life of the spring return unit?

A. The stroke is 1,500 mm and the service life is 200,000 cycles.

Q. How has grease leakage been improved in the spring return unit?

A. Grease leakage has been improved.

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（ばね類） 178 pages Open page 147
  Found on: https://www.samini.co.jp/catalog_list/