# US 2017/0282992 A1 · Shock absorber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0282992 A1 - Document ID: US20170282992A1 - Status: Published application - Kind: A1 - Application number: 15/415,375 - Filed: 2017-01-25 - Published: 2017-10-05 - Earliest claimed: 2016-03-31 - Assignees: Showa Corporation - Applicants: Showa Corporation - Inventors: Kojiro YOSHIDA - Web page: https://patentgrep.com/patent/US20170282992A1 ## CPC - B62K 25/08: for front wheel - F16F 9/0218: {Mono-tubular units (F16F9/0227, F16F9/0236, F16F9/0245 take precedence)} - F16F 9/065: {Expansion chamber provided on the upper or lower end of a damper, separately there from or laterally on the damper} - F16F 9/067: {Partitions of the piston type, e.g. sliding pistons} - F16F 13/002: {comprising at least one fluid spring (F16F13/005, F16F13/02, F16F13/04 take precedence)} - F16F 15/0232: {with at least one gas spring (F16F15/027 takes precedence)} - F16F 15/067: using only wound springs - B62K 2025/044: {Suspensions with automatic adjustment} - B62K 2025/048: {with suspension manual adjustment details} - B62K 2201/08: Fluid springs - F16F 9/02: using gas only {or vacuum (F16F9/006 takes precedence)} - B62K: CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract A front fork leg includes an inner chamber that absorbs by a gas spring a shock caused on a vehicle; an auxiliary gas spring chamber communicating with the inner chamber; an auxiliary piston provided in the auxiliary gas spring chamber; and a gas spring chamber side gas chamber sectioned by the auxiliary piston and communicating with the inner chamber, and the auxiliary piston moves to increase a volume of the gas spring chamber side gas chamber, as pressure inside the inner chamber increases. ## Claims ### Claim 1 A shock absorber, comprising: a shock absorber main body that absorbs a shock input to a vehicle; a gas spring chamber which is provided inside the shock absorber main body, and inside which gas is sealed, and which absorbs the shock by a gas spring that is based on the gas; an auxiliary gas spring chamber, inside which the gas is sealed, and which communicates with the gas spring chamber, and which is formed in a cylindrical shape; a movable partition wall which is provided slidably in an axial direction inside the auxiliary gas spring chamber; a gas spring chamber side gas chamber which is sectioned by the movable partition wall in the auxiliary gas spring chamber and which communicates with the gas spring chamber; and an elastic body side gas chamber which is sectioned by the movable partition wall in the auxiliary gas spring chamber, and which is formed on an opposite side of the movable partition wall to the gas spring chamber side gas chamber, and which has an elastic body having a prescribed modulus of elasticity that urges the movable partition wall towards the gas spring chamber side gas chamber, wherein the movable partition wall moves towards the elastic body side gas chamber so as to increase a volume of the gas spring chamber side gas chamber, as pressure inside the gas spring chamber increases. ### Claim 2 (depends on 1) The shock absorber according to claim 1, wherein the elastic body of the elastic body side gas chamber has a gas spring that is based on the gas sealed therein, and a metal spring. ### Claim 3 (depends on 1) The shock absorber according to claim 1, wherein the elastic body has a plurality of metal springs. ### Claim 4 (depends on 2) The shock absorber according to claim 2, wherein the elastic body has a plurality of metal springs. ### Claim 5 (depends on 1) The shock absorber according to claim 1, wherein the auxiliary gas spring chamber is provided outside the shock absorber main body. ### Claim 6 (depends on 2) The shock absorber according to claim 2, wherein the auxiliary gas spring chamber is provided outside the shock absorber main body ### Claim 7 (depends on 3) The shock absorber according to claim 3, wherein the auxiliary gas spring chamber is provided outside the shock absorber main body ### Claim 8 (depends on 4) The shock absorber according to claim 4, wherein the auxiliary gas spring chamber is provided outside the shock absorber main body ### Claim 9 (depends on 5) The shock absorber according to claim 5, further comprising a tubular member which connects the gas spring chamber and the auxiliary gas spring chamber. ### Claim 10 (depends on 6) The shock absorber according to claim 6, further comprising a tubular member which connects the gas spring chamber and the auxiliary gas spring chamber. ### Claim 11 (depends on 7) The shock absorber according to claim 7, further comprising a tubular member which connects the gas spring chamber and the auxiliary gas spring chamber. ### Claim 12 (depends on 8) The shock absorber according to claim 8, further comprising a tubular member which connects the gas spring chamber and the auxiliary gas spring chamber. ### Claim 13 (depends on 1) The shock absorber according to claim 1, further comprising a piston which forms a portion of the gas spring chamber, wherein the auxiliary gas spring chamber is fixed to a gas spring chamber side end of the piston. ### Claim 14 (depends on 2) The shock absorber according to claim 2, further comprising a piston which forms a portion of the gas spring chamber, wherein the auxiliary gas spring chamber is fixed to a gas spring chamber side end of the piston. ### Claim 15 (depends on 3) The shock absorber according to claim 3, further comprising a piston which forms a portion of the gas spring chamber, wherein the auxiliary gas spring chamber is fixed to a gas spring chamber side end of the piston. ### Claim 16 (depends on 4) The shock absorber according to claim 4, further comprising a piston which forms a portion of the gas spring chamber, wherein the auxiliary gas spring chamber is fixed to a gas spring chamber side end of the piston. ### Claim 17 (depends on 1) The shock absorber according to claim 1, wherein the shock absorber main body is formed as an air suspension which produces a main shock absorbing action by using the gas sealed therein.