Electric propulsion unit and torque transmission group for an electric scooter and corresponding scooter

• US 9,381,970 B2
• Filed: 02/26/2015
• Issued: 07/05/2016
• Est. Priority Date: 03/20/2014
• Status: Active Grant

• Current Assignee: Askoll Eva S.R.L.
• Original Assignee: Askoll Eva S.R.L.
• Inventors: Marioni, Elio
• Primary Examiner(s): Boehler, Anne Marie
• Assistant Examiner(s): STABLEY, MICHAEL R
• Application Number:
  US14/632,621
• Publication Number:
  US 20150266535A1
• Time in Patent Office: 495 Days
• Field of Search: 180/220
• US Class Current: 1/1
• CPC Class Codes: 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; electric transmission arrangements B60K17/12; electric equipment or propulsion of electrically-propelled vehicles per se B60L; current-collectors for power supply lines of electrically-propelled vehicles B60L5/00
• CPC Class Codes: B60K 1/04 of the electric storage means for propulsion exchanging batteries for electric propulsion of vehicles B60L53/80; for auxiliary purposes only B60R16/04; supplying batteries to, or removing batteries from, vehicles B60S5/06
• CPC Class Codes: B60K 2001/006 the electric motors
• CPC Class Codes: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2200/12 Bikes
• CPC Class Codes: B60L 2220/12 Induction machines
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 50/64 Constructional details of batteries specially adapted for electric vehicles
• CPC Class Codes: B60L 50/66 Arrangements of batteries
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 53/80 Exchanging energy storage elements, e.g. removable batteries
• CPC Class Codes: B62K 11/10 characterised by the engine being over or beside driven rear wheel
• CPC Class Codes: B62K 2202/00 Motorised scooters
• CPC Class Codes: B62M 7/00 Motorcycles characterised by position of motor or engine rider propulsion with addition source of power, e.g. auxiliary combustion engine or electric motor B62M6/00; frames characterised by position of engine B62K11/00
• CPC Class Codes: B62M 7/02 with engine between front and rear wheels
• CPC Class Codes: B62M 7/12 with the engine beside or within the driven wheel
• CPC Class Codes: B62M 9/02 of unchangeable ratio
• CPC Class Codes: B62M 9/16 Tensioning or adjusting equipment for chains, belts or the like
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 : Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles

Abstract

The invention relates to an electric propulsion unit (10) and torque transmission group (11) for operating the rear wheel (13) of an electric scooter (1) with body (2) of the step-through type and with upright sitting portion (6). The electric propulsion unit (10) comprises at least one synchronous electric motor (30) of the type comprising internal stator (32) and external rotor (29) with a cup-shaped form rotating on a fixed shaft (33) rigid with the stator (32); the motor is installed in a barycentric position substantially at the base of the upright sitting portion (6) with the fixed shaft (33) transverse to the longitudinal axis (X-X) of the scooter (2), and the transmission group (11) comprises at least one first and one second reduction stage (24, 26).

Claims

1. An electric propulsion unit and torque transmission group for operating a rear wheel of an electric scooter with a step-through body and with an upright sitting portion, said electric propulsion unit comprising:

at least one synchronous electric motor, wherein said synchronous electric motor comprises an internal stator and an external rotor with a cup-shaped form rotating on a fixed shaft rigidly connected to the stator,

the motor being designed to be installed in a barycentric position with respect to the scooter substantially at the base of the upright sitting portion with the fixed shaft transverse to the longitudinal axis of the scooter, and

said transmission group comprising at least one first and one second reduction stage formed with a belt-and-pulley transmission,

said transmission group further comprising a support sliding in said casing for an intermediate shaft inserted between said first and second reduction stages, so as to allow relative tensioning of the transmission belts.

2. The electric propulsion unit and torque transmission group according to claim 1, wherein said transmission is formed with toothed pulleys and belts.

3. The electric propulsion unit and torque transmission group according to claim 1, wherein a heat dissipator forming an axial extension of the fixed drive shaft is associated with the stator of the electric motor.

4. The electric propulsion unit and torque transmission group according to claim 1, wherein the synchronous motor is of the brushless type driven by means of an inverter.

5. The electric propulsion unit and torque transmission group according to claim 1, wherein said electric propulsion unit comprises a battery housing compartment which can be integrated in the upright sitting portion of the scooter.

6. The electric propulsion unit and torque transmission group according to claim 5, wherein at least two structurally independent rechargeable battery packs are housed inside said compartment.

7. The electric propulsion unit and torque transmission group according to claim 5, wherein said batteries are removable and provided with battery charger and current plug connector for rapid connection to an electric power supply network.

8. The electric propulsion unit and torque transmission group according to claim 5, wherein each battery pack is singly removable for external recharging.

9. A two-wheel electric scooter comprising an electric propulsion unit and torque transmission group according to claim 1.

10. An electric propulsion unit and torque transmission group for operating a rear wheel of an electric scooter with a step-through body and with an upright sitting portion, said electric propulsion unit comprising:

at least one synchronous electric motor, wherein said synchronous electric motor comprises an internal stator and an external rotor with a cup-shaped form rotating on a fixed shaft rigidly connected to the stator, the motor being designed to be installed in a barycentric position with respect to the scooter substantially at the base of the upright sitting portion with the fixed shaft transverse to the longitudinal axis of the scooter, and

said transmission group comprising at least one first and one second reduction stage, wherein

said propulsion group comprises a second synchronous electric motor which can be selectively coupled to the transmission group by means of a mechanism comprising a free wheel.