Locking Differential For Electric Golf Cars And Utility Vehicles

• US 20080164084A1
• Filed: 01/05/2007
• Published: 07/10/2008
• Est. Priority Date: 01/05/2007
• Status: Abandoned Application

• Current Assignee: Textron Inc
• Original Assignee: Textron Inc
• Inventors: Bell, Oliver A., Clark, Warren, Singletary, Aric
• Application Number:
  US11/620,084
• Publication Number:
  US 20080164084A1
• Time in Patent Office: Days
• US Class Current: 180/197
• CPC Class Codes: B60K 17/16 of differential gearing
• CPC Class Codes: B60K 28/165 acting on elements of the vehicle drive train other than the propulsion unit and brakes, e.g. transmission, clutch, differential acting on brakes B60T8/17
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 15/2036 Electric differentials, e.g. for supporting steering vehicles
• CPC Class Codes: B60L 2200/22 Microcars, e.g. golf cars
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2250/26 by pedal actuation
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/16 Axle differentials, e.g. for dividing torque between left and right wheels
• CPC Class Codes: B60W 30/18172 Preventing, or responsive to skidding of wheels
• CPC Class Codes: B60Y 2200/86 Carts; Golf carts
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

An electric vehicle is provided with motor braking and includes a locking differential that provides positive braking on slippery surfaces so as to prevent relative movement of the first and second output shafts of the differential.

Claims

1. A vehicle comprising:

an electric motor;

a differential drivingly connected to said electric motor and including first and second output shafts, said differential including a locking mechanism for controllably engaging said first and second output shafts together;

a pair of drive wheels each drivingly connected to a respective one of said first and second output shafts; and

a controller responsive to a braking condition of said vehicle for actuating said locking mechanism.

2. The vehicle according to claim 1, wherein said locking mechanism includes a solenoid device drivingly connected to a coupling sleeve.

3. The vehicle according to claim 2, wherein said solenoid is connected to said coupling sleeve by a linkage mechanism.

4. The vehicle according to claim 1, further comprising a brake pedal position sensor for providing a signal to said controller indicative of said braking condition.

5. The vehicle according to claim 4, wherein said controller actuates said locking mechanism when said signal from said brake pedal position sensor exceeds a predetermined level.

6. The vehicle according to claim 1, wherein said controller controls said electric motor to provide electric braking such that engagement of said first and second output shafts by said locking mechanism prevents said differential from allowing either of said pair of drive wheels to rotate.

7. A method of preventing wheel slip in an electric vehicle including a differential connecting an electric motor with a pair of drive shafts, said method comprising the steps of:

detecting a braking condition of said vehicle; and

locking said differential when a predetermined braking condition of said vehicle is detected.