# US 10,480,396 B2 · Spacer and electric supercharger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,396 B2 - Document ID: US10480396B2 - Status: Granted - Kind: B2 - Application number: 15/707,002 - Filed: 2017-09-18 - Published: 2018-04-19 - Granted: 2019-11-19 - Earliest claimed: 2016-10-14 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Takahiro Sadamitsu; Makoto Takeyama - Web page: https://patentgrep.com/patent/US10480396B2 ## CPC - F02B 33/40: of non-positive-displacement type - F02B 39/10: electric - F04D 25/0606: {the electric motor being specially adapted for integration in the pump} - F04D 25/064: {Details of the rotor} - F04D 29/059: Roller bearings - F16C 19/06: with a single row or balls - F16C 19/547: {with two angular contact rolling bearings} - F16C 25/083: {with resilient means acting axially on a race ring to preload the bearing} - F16C 27/066: {Ball or roller bearings} - F16C 35/063: Fixing them on the shaft (with interposition of an element F16C35/07) - F05D 2220/40: in turbochargers - F16C 19/163: {with angular contact} - F16C 35/077: between housing and outer race ring - F16C 2360/44: Centrifugal pumps - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A spacer is disposed between a rotor and a bearing of an electric supercharger to fix the rotor. The spacer has a tapered surface with a diameter decreasing toward the bearing in an outer circumferential surface of the spacer. An area of an end surface of the spacer on a rotor side is larger than an area of an end surface of the spacer on a bearing side. A balance correction part that corrects balance of the spacer is disposed inside a recess formed in the end surface. A region of the end surface located on an outer side of the recess relative to a central axis of the spacer constitutes a surface coming in contact with the rotor. ## Claims ### Claim 1 A spacer that is disposed, to fix a rotor of an electric supercharger, between the rotor and a bearing disposed in a direction of a rotational axis of the rotor relative to the rotor, the spacer comprising a tapered surface with a diameter decreasing toward the bearing in an outer circumferential surface of the spacer, wherein an area of an end surface of the spacer on a rotor side is larger than an area of an end surface of the spacer on a bearing side, a balance correction part that corrects balance of the spacer is disposed inside a recess formed in the end surface of the spacer on the rotor side, and a region of the end surface located on an outer side of the recess relative to a central axis of the spacer constitutes a surface coming in contact with the rotor. ### Claim 2 (depends on 1) The spacer according to claim 1, wherein: the spacer has a conical outer shape; and the spacer includes a perforated portion, and the central axis of the spacer is disposed on the rotational axis of the rotor. ### Claim 3 (depends on 1) The spacer according to claim 1, wherein the balance correction part is a weight adjustment part that is formed in the spacer so that a center of gravity of the spacer is located on the central axis of the spacer. ### Claim 4 (depends on 1) The spacer according to claim 1, wherein: the balance correction part includes an excavated portion formed in the spacer, and a burr resulting from formation of the excavated portion; and the recess is formed so as to have a diameter around the central axis of the spacer, and has a depth that allows the recess to accommodate the burr of the balance correction part. ### Claim 5 (depends on 1) The spacer according to claim 1, wherein the balance correction part is a weight provided inside the recess. ### Claim 6 An electric supercharger in which a spacer is disposed, to fix a rotor, between the rotor and a bearing disposed in a direction of a rotational axis of the rotor relative to the rotor, the electric supercharger comprising: a housing that supports a shaft through the bearing and has an air flow passage; a turbine that is disposed inside the flow passage and fixed at a leading end of the shaft; and a stator that surrounds the rotor and is fixed to the housing, wherein an area of an end surface of the spacer on a rotor side is larger than an area of an end surface of the spacer on a bearing side, the spacer has a tapered surface with a diameter decreasing toward the bearing in an outer circumferential surface of the spacer, a balance correction part that corrects balance of the spacer is disposed inside a recess formed in the end surface of the spacer on the rotor side, and a region of the end surface located on an outer side of the recess relative to a central axis of the spacer constitutes a surface coming in contact with the rotor. ### Claim 7 (depends on 6) The electric supercharger according to claim 6, wherein: the spacer has a conical outer shape; and the spacer includes a perforated portion that extends through the spacer in a left-right direction of the electric supercharger, and the central axis of the spacer is disposed on the rotational axis of the shaft. ### Claim 8 (depends on 6) The electric supercharger according to claim 6, wherein the balance correction part is a weight adjustment part that is formed in the spacer so that a center of gravity of the spacer is located on the central axis of the spacer. ### Claim 9 (depends on 6) The electric supercharger according to claim 6, wherein: the balance correction part includes an excavated portion formed in the spacer, and a burr resulting from formation of the excavated portion; and the recess is formed so as to have a diameter around the central axis of the spacer, and has a depth that allows the recess to accommodate the burr of the balance correction part. ### Claim 10 (depends on 6) The electric supercharger according to claim 6, wherein the balance correction part is a weight provided inside the recess.