# US 8,740,199 B2 · Spring assembly and manufacturing method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,740,199 B2 - Document ID: US8740199B2 - Status: Granted - Kind: B2 - Application number: 12/801,563 - Filed: 2010-06-15 - Published: 2010-12-23 - Granted: 2014-06-03 - Earliest claimed: 2009-06-18 - Assignees: Piolax, Inc. - Applicants: Kensuke Takeda; Yasutaka Uematsu; Toshie Fueki - Inventors: Kensuke Takeda; Yasutaka Uematsu; Toshie Fueki - Web page: https://patentgrep.com/patent/US8740199B2 ## CPC - F16F 3/06: of which some are placed around others in such a way that they damp each other by mutual friction - F16F 1/125: {where the end coils of the spring engage an axial insert (F16F1/126, F16F1/128 take precedence)} - Y10T 29/49826: Assembling or joining - Y10T 29/4992: by flaring inserted cup or tube end - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract According to one embodiment, a spring assembly includes: a substrate; a coil spring having an end turn portion fixed to the substrate; an inner wall provided at an inner peripheral side of the coil spring; and an outer wall provided at an outer peripheral side of the coil spring, wherein one of the inner wall and the outer wall forms a spring fixing wall configured to prevent the end turn portion of the coil spring from coming off in an axial direction of the coil spring, and wherein the other of the inner wall and the outer wall forms a support wall configured to prevent the end turn portion of the coil spring from moving in a radial direction of the coil spring. ## Claims ### Claim 1 A spring assembly comprising: a substrate; a coil spring having an end turn portion fixed to the substrate; an inner wall provided at an inner peripheral side of the coil spring so as to form a through hole in the substrate; and an outer wall provided at an outer peripheral side of the coil spring, wherein the inner wall forms a spring fixing wall configured to prevent the end turn portion of the coil spring from coming off in an axial direction of the coil spring, wherein the outer wall forms a support wall configured to prevent the end turn portion of the coil spring from moving in a radial direction of the coil spring, wherein the inner wall extends outward towards the outer wall so as to stake the end turn portion of the coil spring, and wherein a width of an opening formed by the inner wall and outer wall is less than a diameter of a wire rod forming the end turn portion of the coil spring. ### Claim 2 (depends on 1) The spring assembly of claim 1, wherein the inner wall extends from the substrate along the inner peripheral side of the coil spring, and wherein the outer wall extends from the substrate along the outer peripheral side of the coil spring. ### Claim 3 (depends on 2) The spring assembly of claim 2, wherein the outer wall forming the support wall is formed by half blanking to the substrate. ### Claim 4 (depends on 2) The spring assembly of claim 2, wherein the outer wall forming the support wall is formed by cutting and bending up the substrate. ### Claim 5 (depends on 2) The spring assembly of claim 2, wherein the inner wall forming the spring fixing wall is formed as a cylindrical wall extending from the substrate, wherein a distal opening edge of the cylindrical wall is broadened in diameter to stake the end turn portion of the coil spring to the cylindrical wall of the substrate, wherein an extension amount of the spring fixing wall from the substrate is set larger than a radius of a wire rod forming the coil spring, wherein an interval between a distal end of the spring fixing wall and a distal end of the support wall after being staked is smaller than a diameter of the wire rod, and wherein a gap is formed between the outer wall forming the support wall and the end turn portion of the coil spring. ### Claim 6 (depends on 2) The spring assembly of claim 2, wherein the inner wall forming the spring fixing wall is formed as a cylindrical wall extending from the substrate, wherein a distal opening edge of the cylindrical wall is broadened in diameter to stake the end turn portion of the coil spring to the cylindrical wall of the substrate, and wherein the outer wall forming the support wall is in contact with the end turn portion of the coil spring. ### Claim 7 (depends on 1) The spring assembly of claim 1, wherein the outer wall is formed in the substrate such that a side of the substrate opposite the coil spring extends toward the coil spring at a portion of the substrate on which the outer wall is formed. ### Claim 8 (depends on 1) The spring assembly of claim 1, wherein a side of the outer wall opposite the coil spring comprises a step portion. ### Claim 9 (depends on 1) The spring assembly of claim 1, wherein a bottom of the substrate includes an indented portion under the outer wall. ### Claim 10 (depends on 1) The spring assembly of claim 1, wherein a height of the outer wall is greater than a radius of a wire rod forming the coil spring. ### Claim 11 (depends on 1) The spring assembly of claim 1, wherein a gap is formed between the end turn portion of the coil spring and the outer wall. ### Claim 12 A method for manufacturing a spring assembly the method comprising: providing a coil spring; providing a substrate, the substrate including: an inner wall provided at an inner peripheral side of the coil so as to form a through hole in the substrate; and an outer wall provided at an outer peripheral side of the coil spring; coaxially arranging the end turn portion of the coil spring to the inner wall of the substrate; and broadening the distal opening edge of the inner wall in diameter to form the the inner wall into a spring fixing wall while bringing the end turn portion of the coil spring into contact with the outer wall forming a support wall, wherein the spring fixing wall is configured so as to prevent the end turn portion of the coil spring from coming off in an axial direction of the coil spring, wherein the outer wall forming the support wall prevents the end turn portion of the coil spring from moving in a radial direction of the coil spring, wherein the inner wall extends outward towards the outer wall so as to stake the end turn portion of the coil spring, wherein the inner wall forming the spring fixing wall extends from substrate along the inner peripheral side of the coil spring, wherein the outer wall extends from the substrate along the outer peripheral side of the coil wring, wherein the inner wall forming the spring fixing wall is formed as a cylindrical wall extending from the substrate, wherein a distal opening edge of the cylindrical wall is broadened in diameter to stake the end turn portion of the coil spring to the cylindrical wall of the substrate, and wherein the outer wall forming the support wall is in contact with the end turn portion of the coil spring. ### Claim 13 A spring assembly comprising: a substrate comprising a metal; a coil spring having an end turn portion fixed to the substrate; an inner wall provided at an inner peripheral side of the coil spring; and an outer wall provided at an outer peripheral side of the coil spring, wherein the inner wall forms a spring fixing wall configured to prevent the end turn portion of the coil spring from coming off in an axial direction of the coil spring, wherein the outer wall forms a support wall configured to prevent the end turn portion of the coil spring from moving in a radial direction of the coil spring, wherein the inner wall extends outward towards the outer wall so as to stake the end turn portion of the coil spring, and wherein a width of an opening formed by the inner wall and outer wall is less than a diameter of a wire rod forming the end turn portion of the coil swing.