# US 2021/0340900 A1 · Wastegate assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0340900 A1 - Document ID: US20210340900A1 - Status: Published application - Kind: A1 - Application number: 17/269,362 - Filed: 2019-09-20 - Published: 2021-11-04 - Earliest claimed: 2018-09-21 - Assignees: BorgWarner Inc.; GM Global Technology Operations LLC - Applicants: BorgWarner Inc. - Inventors: Dominic William DePaoli; Aaron Date; Michael Daniel Cola; Grant W. Brady - Web page: https://patentgrep.com/patent/US20210340900A1 ## CPC - F02B 37/186: {Arrangements of actuators or linkage for bypass valves} - F02B 37/183: {Arrangements of bypass valves or actuators therefor} - Y02T 10/12: Improving ICE efficiencies - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A wastegate assembly for controlling flow of exhaust gas includes a valve element having a valve body and a valve shaft. The wastegate assembly further includes a spindle having a head defining an opening for receiving the valve shaft. The wastegate assembly further includes a washer coupled to the valve shaft and spaced from the spindle such that the spindle is disposed between the valve body and the washer. The spindle head or the washer includes a raised lip extending towards the other of the spindle head or the washer, with the other of the spindle head or the washer defining a notch configured to at least partially receive the raised lip and configured to cooperate with the raised lip to shield the biasing member from exhaust gas and high temperatures. ## Claims ### Claim 1 A wastegate assembly for controlling flow of exhaust gas from an internal combustion engine and through a wastegate channel of a turbocharger, said wastegate assembly comprising: a valve element having a valve body and a valve shaft extending away from said valve body, with said valve shaft extending along an axis, and with said valve element moveable between a first position and a second position to control the flow of exhaust gas through the wastegate channel of the turbocharger; a spindle having a head defining an opening for receiving said valve shaft for moving said valve element between said first position and said second position; a washer coupled to said valve shaft and spaced from said spindle along said axis such that said spindle is disposed between said valve body and said washer for securing said spindle to said valve shaft; and a biasing member disposed between said spindle and said washer; wherein one of said spindle head or said washer includes a raised lip extending towards the other of said spindle head or said washer, with the other of said spindle head or said washer defining a notch configured to at least partially receive said raised lip and configured to cooperate with said raised lip to shield said biasing member from the exhaust gas. ### Claim 2 (depends on 1) The wastegate assembly of claim 1 wherein said head of said spindle includes said raised lip with said raised lip spaced from said valve shaft. ### Claim 3 (depends on 2) The wastegate assembly of claim 2 wherein said raised lip of said head of said spindle is located about an outer perimeter of said head. ### Claim 4 (depends on 1) The wastegate assembly as set forth in claim 1 wherein said biasing member is disposed between said raised lip of said spindle head and said valve shaft. ### Claim 5 (depends on 1) The wastegate assembly as set forth in claim 1 wherein said biasing member is a cup spring. ### Claim 6 (depends on 5) The wastegate assembly as set forth in claim 5 wherein said washer is welded to said valve shaft. ### Claim 7 (depends on 6) The wastegate assembly as set forth in claim 6 wherein said opening of said head of said spindle is circular in cross-section and said raised lip is also circular in cross-section. ### Claim 8 (depends on 7) The wastegate assembly as set forth in claim 7 wherein said valve shaft includes a first diameter (D1) adjacent said washer and a second diameter (D2) adjacent said spindle head, with said first diameter (D1) less than said second diameter (D2) for aligning said spindle and said washer with said valve shaft. ### Claim 9 (depends on 8) The wastegate assembly as set forth in claim 8 wherein said raised lip and said notch are spaced from each other in said first position and in said second position. ### Claim 10 (depends on 1) The wastegate assembly as set forth in claim 1 wherein: said raised lip and said notch are spaced from each other in said first position and in said second position by a first distance (FD), wherein said spindle head defines a flat surface facing said washer and said washer defines a bottom washer surface facing and spaced from said flat surface by a second distance (SD), and wherein said first distance (FD) is less than said second distance (SD) for preventing over compression of said biasing member. ### Claim 11 (depends on 10) The wastegate assembly as set forth in claim 10 wherein said biasing member is completely located between said flat surface of said spindle head and said bottom washer surface. ### Claim 12 (depends on 11) The wastegate assembly as set forth in claim 11 wherein said biasing member is a cup spring. ### Claim 13 (depends on 1) A turbocharger comprising the wastegate assembly as set forth in claim 1. ### Claim 14 A wastegate assembly for controlling flow of exhaust gas from an internal combustion engine and through a wastegate channel of a turbocharger, said wastegate assembly comprising: a valve element having a valve body and a valve shaft extending away from said valve body, with said valve shaft extending along an axis, and with said valve element moveable between a first position and a second position to control the flow of exhaust gas through the wastegate channel of the turbocharger; a spindle having a head defining an opening for receiving said valve shaft for moving said valve element between said first position and said second position; a washer coupled to said valve shaft and spaced from said spindle along said axis such that said spindle is disposed between said valve body and said washer for securing said spindle to said valve shaft; and a cup spring disposed between said spindle and said washer; wherein one of said spindle head or said washer includes a raised lip extending towards the other of said spindle head or said washer, with the other of said spindle head or said washer defining a notch configured to at least partially receive said raised lip and configured to cooperate with said raised lip to shield said biasing member from the exhaust gas; wherein said raised lip and said notch are spaced from each other in said first position and in said second position by a first distance (FD); wherein said spindle head defines a flat surface facing said washer and said washer defines a bottom washer surface facing and spaced from said flat surface by a second distance (SD), and wherein said first distance (FD) is less than said second distance (SD) for preventing over compression of said biasing member. ### Claim 15 (depends on 14) The wastegate assembly of claim 14 wherein said head of said spindle includes said raised lip. ### Claim 16 (depends on 15) The wastegate assembly of claim 15 wherein said raised lip of said head of said spindle is located about an outer perimeter of said head. ### Claim 17 (depends on 14) A turbocharger comprising the wastegate assembly as set forth in claim 14. ### Claim 18 (depends on 1) The wastegate assembly as set forth in claim 1 wherein said biasing member is a cup spring and is disposed between said raised lip of said spindle head and said valve shaft. ### Claim 19 (depends on 18) The wastegate assembly as set forth in claim 18 wherein said washer is welded to said valve shaft and wherein said opening of said head of said spindle is circular in cross-section and said raised lip is circular in cross-section. ### Claim 20 (depends on 18) The wastegate assembly as set forth in claim 18 wherein said valve shaft includes a first diameter (D1) adjacent said washer and a second diameter (D2) adjacent said spindle head, with said first diameter (D1) less than said second diameter (D2) for aligning said spindle and said washer with said valve shaft.