# US 9,518,620 B2 · Disconnector-type clutch for rear wheel-driving device in four-wheel driving electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,620 B2 - Document ID: US9518620B2 - Status: Granted - Kind: B2 - Application number: 14/252,738 - Filed: 2014-04-14 - Published: 2014-10-16 - Granted: 2016-12-13 - Earliest claimed: 2013-04-12 - Assignees: Hyundai Wia Corporation - Applicants: Hyundai Wia Corporation - Inventors: Hong Kyu Choi - Web page: https://patentgrep.com/patent/US9518620B2 ## CPC - F16D 23/12: Mechanical clutch-actuating mechanisms arranged outside the clutch as such (specific for combined clutches F16D21/00; mechanisms specific for synchronisation F16D23/02) - B60K 23/08: for changing number of driven wheels {, for switching from driving one axle to driving two or more axles (B60K17/3515 takes precedence)} - F16D 11/10: with clutching members movable only axially - F16D 28/00: Electrically-actuated clutches (arrangements for synchronisation F16D23/02; clutches actuated directly by means of an electromagnet F16D27/00; automatic clutches F16D43/00 - F16D45/00; external control F16D48/00) - B60K 2001/001: {one motor mounted on a propulsion axle for rotating right and left wheels of this axle} - B60K 2023/0858: {with electric means, e.g. electro-hydraulic means} - F16D 2011/002: {using an external and axially slidable sleeve for coupling the teeth of both coupling components together} - F16D 2023/123: {Clutch actuation by cams, ramps or ball-screw mechanisms} - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - 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 Disclosed is a disconnector-type clutch for a rear wheel-driving device in a 4-wheel driving electric vehicle, which can eliminate a loss in the driving force due to a slip of friction plates disposed in a multiple disc clutch by transmitting power to rear wheels using the disconnector-type clutch, instead of the multiple disc clutch in 4-wheel driving, and can prevent a loss in the energy by preventing a differential from unnecessarily rotating when rear wheels are drawn by a driving force of front wheels in 2-wheel driving in which a rear-wheel driving motor is not driven by installing the disconnector-type clutch at a rear end of the differential. The disconnector-type clutch includes an actuator motor generating rotation power, a worm gear connected to the actuator motor, a screw rotating in engagement with the worm gear, a first push case converting a rotary motion of the screw into a linear reciprocating motion, a second push case assembled with the first push case, a first spring installed between the first push case and the second push case, a second spring installed at an exterior side of the second push case to provide a restoration force, a shifting fork connected to the second push case and moving forward and backward, and a sleeve connected to the shifting fork and connecting or disconnecting the first rear-wheel driving shaft and the second rear-wheel driving shaft. ## Claims ### Claim 1 A disconnector-type clutch for a rear wheel-driving device in a 4-wheel driving electric vehicle, the disconnector-type clutch comprising: an actuator motor generating rotation power; a worm gear connected to the actuator motor; a screw rotating in engagement with the worm gear; a first push case converting a rotary motion of the screw into a linear reciprocating motion; a second push case assembled with the first push case, the first push case and the second push case collectively defining a cavity; a first spring installed between the first push case and the second push case and located within the cavity; a second spring installed at an exterior side of the second push case to provide a restoration force; a shifting fork connected to the second push case and moving forward and backward; and a sleeve connected to the shifting fork and connecting or disconnecting a first rear-wheel driving shaft and a second rear-wheel driving shaft; wherein the first push case has outer and inner case portions and a screw thread to be engaged with the screw is formed on an inner circumferential surface of the inner case portion, at least a portion of the second push case being received between the outer and inner case portions. ### Claim 2 (depends on 1) The disconnector-type clutch of claim 1, wherein the first rear-wheel driving shaft is installed to penetrate an inside of a rear-wheel driving motor. ### Claim 3 (depends on 1) The disconnector-type clutch of claim 1, wherein the screw has a centrally formed gear engaged with the worm gear and a screw thread is formed in both front and rear directions. ### Claim 4 (depends on 1) The disconnector-type clutch of claim 1, wherein a nut is installed at one side of the screw, and first and second sensors for sensing forward and rearward motions of the first push case are installed using the nut. ### Claim 5 (depends on 1) The disconnector-type clutch of claim 1, wherein a sleeve is installed at an interior side of the shifting fork to be spline-coupled to the first rear-wheel driving shaft and the second rear-wheel driving shaft to connect or disconnect the first rear-wheel driving shaft and the second rear-wheel driving shaft. ### Claim 6 (depends on 1) The disconnector-type clutch of claim 1, wherein in 4-wheel driving, the sleeve connects the first rear-wheel driving shaft and the second rear-wheel driving shaft to be engaged with each other to transmit the rotation power of the first rear-wheel driving shaft to the second rear-wheel driving shaft. ### Claim 7 (depends on 1) The disconnector-type clutch of claim 1, wherein in 2-wheel driving, the sleeve moves so as to disconnect the first rear-wheel driving shaft and the second rear-wheel driving shaft from each other to prevent the rotation power of the first rear-wheel driving shaft from being transmitted to the second rear-wheel driving shaft. ### Claim 8 (depends on 1) The disconnector-type clutch of claim 1, wherein the first rear-wheel driving shaft and the second rear-wheel driving shaft are selectively connected via an inner circumferential surface of the sleeve. ### Claim 9 (depends on 1) The disconnector-type clutch of claim 1, wherein the second push case overlaps a portion of the first push case. ### Claim 10 (depends on 1) The disconnector type clutch of claim 1, wherein the a portion of the second push case is received within the first push case.