Coil spring for suspension

Patent metadata

Field	Value
Publication number	US-10899188-B2
Application number	US-202016799916-A
Country	US
Kind code	B2
Filing date	Feb 25, 2020
Priority date	Oct 1, 2015
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

A coil spring includes a wire shaped to be helical, and is compressed between an upper spring seat and a lower spring seat. The coil spring includes an upper portion and a lower portion. A positive pitch winding end portion is formed on the upper portion of the coil spring. A terminal-point-strong-abutting-portion is formed at a distal end of the winding end portion. The terminal-point-strong-abutting-portion is in contact with the upper spring seat at one point at a position deviated to an inner side of a vehicle with respect to a coil central axis. On the lower portion of the coil spring, an end turn portion which contacts the lower spring seat is formed.

First claim

What is claimed is:

1. A suspension coil spring which is formed of a helically wound wire, and which is compressed by a compressive load between an upper spring seat and a lower spring seat, the suspension coil spring comprising:
a winding end portion of a positive pitch provided at an upper portion of the wire;
a terminal-point-strong-abutting-portion provided at a distal end of the winding end portion, the terminal-point-strong-abutting-portion contacting the upper spring seat at one point at a position deviated to an inner side of a vehicle with respect to a coil central axis; and
an end turn portion provided at a lower portion of the wire, the end turn portion comprising:
a first portion which is a non-effective turn portion, has a predetermined length from a lower end of the wire, is arranged at a position deviated to an outer side of the vehicle opposite to a side that the terminal-point-strong-abutting-portion is provided, and is always in contact with the lower spring seat irrespective of magnitude of the compressive load; and
a second portion which is separated from the lower spring seat when the compressive load is small, and contacts the lower spring seat when the compressive load is large,

wherein a force line position of the coil spring which is a center line of a repulsive load of the coil spring is inclined in a direction along a line of action of force input of the compressive load at an angle with respect to the coil central axis in a state where the coil spring is compressed by the compressive load.

2. The suspension coil spring of claim 1 , wherein the winding end portion has a pitch angle which allows a region extending to 0.4 turns from a distal end of the wire to contact the upper spring seat in a state where a load is applied.

3. The suspension coil spring of claim 1 , further comprising a protection tip provided on the terminal-point-strong-abutting-portion, wherein the protection tip comes into contact with the upper spring seat, and the upper spring seat comprises a receiving portion.

Assignees

• Nhk Spring Co Ltd

Inventors

• Okura Ken
• Ohmura Shuji
• Hayashi Shusaku

Classifications

• F16F1/123

  characterised by the ends of the spring being specially adapted, e.g. to form an eye for engagement with a radial insert (F16F1/122, F16F1/125 take precedence) · CPC title

• F16F1/06

  with turns lying in cylindrical surfaces · CPC title

• B60G2202/312

  The spring being a wound spring · CPC title

• B60G2206/71

  Light weight materials · CPC title

• B60G2204/1242

  on a damper, e.g. MacPerson strut · CPC title