# US 12,760,795 B2 · Propulsion system provided with a locking device, such as a parking brake > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,760,795 B2 - Document ID: US12760795B2 - Status: Granted - Kind: B2 - Application number: 18/871,550 - Filed: 2023-06-29 - Published: 2025-11-20 - Granted: 2026-10-13 - Earliest claimed: 2022-06-30 - Assignees: Valeo Embrayages - Applicants: Valeo Embrayages - Inventors: Fabien Lebeau - Web page: https://patentgrep.com/patent/US12760795B2 ## CPC - F16H 63/3425: {characterised by pawls or wheels} - F16H 63/3416: {Parking lock mechanisms or brakes in the transmission} - F16H 63/3466: {using electric motors} - F16H: GEARING ## Abstract A propulsion system for a mobility device includes a casing defining a motor space and an electric motor housed in the motor space. The electric motor includes a stator provided inside the motor space and a rotor mounted to a primary shaft to rotate therewith, the rotation of the primary shaft being guided about an axis relative to the casing with a first bearing and a second bearing which are respectively arranged on either side of the rotor. A locking gear is connected to the primary shaft so as to rotate therewith and is intended to cooperate with a locking mechanism which is arranged so as to assume a locked state in which the locking mechanism cooperates with the locking gear to prevent the rotation thereof about the axis. The locking gear is positioned between the first bearing and the second bearing. ## Claims ### Claim 1 A propulsion system for a mobility apparatus, comprising: a casing comprising a motor space; an electric motor that is housed in the motor space, said electric motor comprising a stator fastened inside the motor space and a rotor rigidly mounted on a primary shaft for rotation therewith, the primary shaft being guided in rotation about an axis, relative to the casing, with a plurality of bearings, the plurality of bearings comprising at least a first bearing and a second bearing, the first bearing and the second bearing being respectively positioned axially on either side of the rotor, none of the bearings of the plurality of bearings being positioned axially between the first bearing and the second bearing; and a locking gear that is rigidly connected to the primary shaft for rotation therewith about the axis, said locking gear being capable of and intended for interacting with a locking mechanism that is arranged to adopt a locked state in which said locking mechanism interacts with the locking gear so as to prevent the locking gear from rotating about the axis, said locking gear being positioned axially between the first bearing and the second bearing. ### Claim 2 (depends on 1) The propulsion system as claimed in claim 1, wherein the locking gear is integrally formed with the primary shaft. ### Claim 3 (depends on 1) The propulsion system as claimed in claim 1, wherein the locking gear comprises a plurality of cavities, the propulsion system comprising a locking mechanism comprising a locking finger that is able to move between a released position and a locked position in which said locking finger is capable of being housed in one of the cavities of the locking gear so as to prevent the locking gear from rotating. ### Claim 4 (depends on 3) The propulsion system as claimed in claim 3, wherein the locking mechanism further comprises: a pawl that is pivotably mounted on the casing and comprises the locking finger, said pawl comprising a cam surface; and a movable carriage that is guided in translation with a guide rail fastened to the casing, the movable carriage comprising a cam follower capable of moving on the cam surface of the pawl in order to pivot said pawl and thus move the locking finger between the released position and the locked position. ### Claim 5 (depends on 3) The propulsion system as claimed in claim 3, further comprising an actuator that interacts with the locking mechanism so as to move the locking finger between the released position and the locked position. ### Claim 6 (depends on 5) The propulsion system as claimed in claim 5, wherein the actuator is positioned outside the casing. ### Claim 7 (depends on 1) The propulsion system as claimed in claim 1, wherein the propulsion system comprises a reduction device comprising an input gear that is coaxial with the axis and rigidly connected to the primary shaft for rotation therewith, the reduction device being housed in a transmission space of the casing. ### Claim 8 (depends on 7) The propulsion system as claimed in claim 7, wherein the input gear and the locking gear are arranged axially on either side of the rotor. ### Claim 9 (depends on 7) The propulsion system as claimed in claim 7, wherein the input gear and the locking gear are arranged axially on the same side of the rotor, the locking gear being arranged axially between the rotor and the input gear. ### Claim 10 (depends on 1) The propulsion system as claimed in claim 1, wherein the primary shaft is guided by only the first bearing and the second bearing. ### Claim 11 (depends on 1) The propulsion system as claimed in claim 1, wherein the casing comprises a first and a second end wall, the first and second end walls respectively comprising a first recess and a second recess, the first bearing and the second bearing being housed in the first recess and in the second recess respectively. ### Claim 12 (depends on 11) The propulsion system as claimed in claim 11, wherein the primary shaft passes through the second end wall, the locking gear and the input gear being positioned axially on the same side of the rotor and axially on either side of at least one of the second end wall and/or and the second bearing. ### Claim 13 (depends on 11) The propulsion system as claimed in claim 11, wherein the second end wall comprises an opening that is made facing at least one cavity of the locking gear and through which a locking finger of the locking mechanism can pass when said locking finger is in a locked position. ### Claim 14 (depends on 13) The propulsion system as claimed in claim 13, wherein the cavities are made on a periphery of said locking gear, the second end wall comprising a protruding portion that protrudes axially in the opposite direction to the motor compartment and in which the second bearing is positioned, the locking gear being housed in said protruding portion, the opening being made in said protruding portion radially facing the periphery of the locking gear. ### Claim 15 (depends on 2) The propulsion system as claimed in claim 2, wherein the locking gear comprises a plurality of cavities, the propulsion system comprising a locking mechanism comprising a locking finger that is able to move between a released position and a locked position in which said locking finger is capable of being housed in one of the cavities of the locking gear so as to prevent the locking gear from rotating. ### Claim 16 (depends on 4) The propulsion system as claimed in claim 4, further comprising an actuator that interacts with the locking mechanism so as to move the locking finger between the released position and the locked position. ### Claim 17 (depends on 2) The propulsion system as claimed in claim 2, wherein the propulsion system comprises a reduction device comprising an input gear that is coaxial with the axis and rigidly connected to the primary shaft for rotation therewith, the reduction device being housed in a transmission space of the casing. ### Claim 18 (depends on 2) The propulsion system as claimed in claim 2, wherein the primary shaft is guided by only the first bearing and the second bearing. ### Claim 19 (depends on 2) The propulsion system as claimed in claim 2, wherein the casing comprises a first and a second end wall, the first and second end walls respectively comprising a first recess and a second recess, the first bearing and the second bearing being housed in the first recess and in the second recess respectively. ### Claim 20 (depends on 12) The propulsion system as claimed in claim 12, wherein the second end wall comprises an opening that is made facing at least one cavity of the locking gear and through which a locking finger of the locking mechanism can pass when said locking finger is in a locked position.