# US 10,865,852 B2 · Powertrain with cycloidal mechanism having reinforced contact surfaces > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,852 B2 - Document ID: US10865852B2 - Status: Granted - Kind: B2 - Application number: 15/919,462 - Filed: 2018-03-13 - Published: 2019-09-19 - Granted: 2020-12-15 - Earliest claimed: 2018-03-13 - Assignees: Schaeffler Technologies AG & Co. KG - Applicants: Schaeffler Technologies AG & Co. KG - Inventors: Carsten Ohr; Peter Eisenhauer - Web page: https://patentgrep.com/patent/US10865852B2 ## CPC - F16H 1/32: in which the central axis of the gearing lies inside the periphery of an orbital gear - B60K 1/00: Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) - B60K 7/0007: {the motor being electric} - B60K 17/046: {with planetary gearing having orbital motion} - B60K 17/145: {the electric gearing being disposed in or adjacent to traction wheel} - B60K 2001/001: {one motor mounted on a propulsion axle for rotating right and left wheels of this axle} - B60K 2007/0092: {the motor axle being coaxial to the wheel axle} - F16H 48/06: with gears having orbital motion - F16H 2001/325: {comprising a carrier with pins guiding at least one orbital gear with circular holes} - F16H: GEARING - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES ## Abstract A powertrain, such as a vehicular electric powertrain, includes a cycloidal speed reducer configured to reduce a speed of an output of a traction motor. The cycloidal speed reducer includes an input member configured to couple with the output of the traction motor. A cycloidal disc has a main body made of a first material and defining a plurality of circumferentially-arranged holes extending through the body. The cycloidal disc has a plurality of inserts each extending through one of the holes. The inserts are made of a second material. A plurality of circumferentially-arranged pins are each disposed in one of the holes and contacting one of the inserts. The inserts provide reinforcement in contact areas between the disc and the pins. ## Claims ### Claim 1 An electric powertrain for a vehicle, the electric powertrain comprising: a cycloidal speed reducer configured to reduce a speed of an output of a traction motor, the cycloidal speed reducer including an input member configured to couple with the output of the traction motor, a cycloidal disc having a main body made of a first material and defining a plurality of circumferentially-arranged holes extending through the body, the cycloidal disc further having a plurality of inserts each extending through one of the holes and being made of a second material, and a plurality of circumferentially-arranged pins each disposed in one of the holes and contacting one of the inserts. ### Claim 2 (depends on 1) The electric powertrain of claim 1, further comprising a differential including a case connected to each of the pins. ### Claim 3 (depends on 1) The electric powertrain of claim 1, wherein the second material is different from the first material. ### Claim 4 (depends on 3) The electric powertrain of claim 3, wherein the second material is steel. ### Claim 5 (depends on 1) The electric powertrain of claim 1, wherein the main body includes a plurality of lobes circumferentially arranged about a perimeter thereof, and wherein an outer ring is secured to the perimeter and extends about the lobes. ### Claim 6 (depends on 5) The electric powertrain of claim 5, wherein the outer ring is made of a material different than the first material. ### Claim 7 (depends on 5) The electric powertrain of claim 5, wherein the main body of the cycloidal disc includes a pair of spaced-apart plates. ### Claim 8 (depends on 5) The electric powertrain of claim 5, wherein the outer ring is welded to the perimeter of the main body. ### Claim 9 A powertrain comprising: a traction motor including a stator, a rotor, and an output shaft fixed to the rotor; and a cycloidal speed reducer coupled to the traction motor and including a ring-pin assembly rotational fixed with the stator, encircling the output shaft, and having a plurality of circumferentially arranged ring pins, an eccentric cam received on the output shaft, a cycloidal disc made of a first material and defining (i) a central hole that receives the eccentric cam, (ii) a plurality of lobes circumferentially arranged about a perimeter of the cycloidal disc, and (iii) plurality of circumferentially-arranged holes extending therethrough, and a plurality of cylindrical inserts made of a second material and each disposed in one of the circumferentially-arranged holes. ### Claim 10 (depends on 9) The powertrain of claim 9, wherein the second material is different from the first material. ### Claim 11 (depends on 10) The powertrain of claim 10, wherein the second material is steel. ### Claim 12 (depends on 10) The powertrain of claim 10, further comprising an outer ring secured to the perimeter of the cycloidal disc and extending over a radial outer surface of the lobes. ### Claim 13 (depends on 12) The powertrain of claim 12, wherein the outer ring is rolled and formed to shape, and is welded to the perimeter of the cycloidal disc. ### Claim 14 (depends on 12) The powertrain of claim 12, wherein the outer ring is made of a material that differs from the first material. ### Claim 15 (depends on 12) The powertrain of claim 12, wherein the cycloidal disc includes a pair of spaced-apart plates both welded to the outer ring. ### Claim 16 A cycloidal disc for an electric powertrain, the cycloidal disc comprising: a main body made of a first material and defining a central hole configured to receive an eccentric cam, a plurality of lobes circumferentially arranged about a perimeter of the main body, and a plurality of circumferentially-arranged holes extending therethrough; a central insert made of a second material and secured to the main body in the central hole; a plurality of inserts made of the second material and each secured to the main body in one of the circumferentially-arranged holes; and an outer ring made of the second material and extending about the perimeter of the main body and extending over the lobes. ### Claim 17 (depends on 16) The cycloidal disc of claim 16, wherein the the second material is different from the first material. ### Claim 18 (depends on 16) The cycloidal disc of claim 16, wherein the second material is steel. ### Claim 19 (depends on 16) The cycloidal disc of claim 16, wherein the main body is defined by a pair of spaced-apart plates each secured to the outer ring. ### Claim 20 (depends on 19) The cycloidal disc of claim 19, wherein the plates are welded to the plurality of inserts and to the outer ring.