Spring assembly for isolator

Patent metadata

Field	Value
Publication number	US-2016138699-A1
Application number	US-201414899152-A
Country	US
Kind code	A1
Filing date	Jul 25, 2014
Priority date	Jul 25, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

In an aspect, a spring assembly is provided for an isolator, and includes first and second helical compression springs, a retainer and a spring housing. The first helical compression spring has a central aperture and has a first end and a second end. The second helical compression spring having a central aperture and having a first end and a second end, wherein the second spring is coaxial with and nested within the first spring. The retainer has a base and a post that extends from the base into the central aperture at the first end of the second helical spring. The spring housing that has an interior space in which the first and second springs are positioned, and further includes a base-engaging aperture that holds the base of the retainer. The spring housing includes a drive wall that is engaged with the first ends of the first and second springs.

First claim

1 . A spring assembly for an isolator or other torque transfer device, comprising:
a first helical compression spring and a second helical compression spring, wherein each of the helical compression springs has a central aperture and has a first end and a second end, wherein the second spring is coaxial with and nested within the first spring; a retainer having a base and a post that extends from the base into the central aperture at the first end of the second helical spring; and a spring housing that has an interior space in which the first and second springs are positioned, and further includes a base-engaging aperture that holds the base of the retainer, wherein the spring housing includes a drive wall that is engaged with the first ends of the first and second springs.

2 . A spring assembly as claimed in claim 1 , wherein the retainer is made from a polymeric material.

3 . A spring assembly as claimed in claim 1 , wherein the spring is made from a metal.

4 . A spring assembly as claimed in claim 1 , wherein the base extends across the first end of both the first and second springs.

5 . A spring assembly as claimed in claim 1 , wherein the spring housing is made from two pieces

6 . A spring assembly as claimed in claim 5 , wherein the spring housing includes a first piece and a second piece that together define the base-engaging structure and provide a press-fit with the base of the retainer.

7 . A spring assembly as claimed in claim 1 , wherein the first and second springs are arcuate and have the same arc length.

8 . A spring assembly as claimed in claim 1 , wherein the first and second springs are arcuate and have different arc lengths.

9 . An isolator for isolating torsional vibration between an input member and an output member, comprising:
a first rotary drive member that is engageable with one of the input and output members; a second rotary drive member that is engageable with the other of the input and output members; a first helical compression spring and a second helical compression spring, wherein each of the helical compression springs has a central aperture and has a first end and a second end, wherein the second spring is coaxial with and nested within the first spring; a retainer having a base and a post that extends from the base into the central aperture at the first end of the second helical spring; and a spring housing that has an interior space in which the first and second springs are positioned, and further includes a base-engaging aperture that holds the base of the retainer, wherein the spring housing includes a drive wall that is engaged with the first ends of the first and second springs.

10 . An isolator as claimed in claim 9 , wherein the retainer is made from a polymeric material.

11 . An isolator as claimed in claim 9 , wherein the spring is made from a metal.

12 . An isolator as claimed in claim 9 , wherein the base extends across the first end of both the first and second springs.

13 . An isolator as claimed in claim 9 , wherein the spring housing is made from two pieces

14 . An isolator as claimed in claim 13 , wherein the spring housing includes a first piece and a second piece that together define the base-engaging structure and provide a press-fit with the base of the retainer.

15 . An isolator as claimed in claim 9 , wherein the first and second springs are arcuate and have the same arc length.

16 . An isolator as claimed in claim 9 , wherein the first and second springs are arcuate and have different arc lengths.

Assignees

• Litens Automotive Inc

Inventors

• Dell James W

Classifications

• F16H2055/366

  with means providing resilience or vibration damping · CPC title

• F16H55/36 Primary

  Pulleys (with features essential for adjustment F16H55/52) · CPC title

• F16F3/04

  composed only of wound springs · CPC title

• B60K25/02 Primary

  directly from an engine shaft · CPC title

• B60K2025/022

  by a mechanical transmission · CPC title