DRIVING SYSTEM FOR AUTOMOBILE ENGINE COOLING FAN

• US 3,853,098 A
• Filed: 09/21/1973
• Issued: 12/10/1974
• Est. Priority Date: 10/05/1972
• Status: Expired due to Term

• Current Assignee: Mituzi Ohshima, Toshio Ishikawa
• Original Assignee: Mituzi Ohshima, Toshio Ishikawa
• Inventors: Ishikawa, Toshio, Ohshima, Mituzi
• Primary Examiner(s): Antonakas, Manuel A.
• Assistant Examiner(s): O'Connor, Daniel J.
• Application Number:
  US05/399,497
• Time in Patent Office: 445 Days
• Field of Search: 123/41.12,41.11,41.48,41.49,41.06,41.44,41.46,41.47,41.63,41.01
• US Class Current: 123/41.11
• CPC Class Codes: F01P 5/04 Pump-driving arrangements
• CPC Class Codes: F01P 7/048 using electrical drives

Abstract

In an automobile engine cooling system of the type in which the engine cooling water is circulated in a radiator and a cooling fan provided to supply a draft of cooling air through the radiator is driven by the engine, a cooling fan driving system comprising an one-way clutch provided between the cooling fan and the engine to transmit the power in one direction but not the other, i.e., from the engine side to the cooling fan side, a motor for driving the cooling fan at a higher speed with the increased number of revolutions than that of the engine at the idling speed, and motor control means for automatically switching on the motor when the engine temperature exceeds a preset temperature or when the automobile is idling or moving at slow speeds.

Claims

1. In a driving system for an automobile engine cooling fan comprising a radiator, and a cooling fan driven by an engine to draw cooling air through the radiator, the improvement comprising a first one-way clutch provided between said cooling fan and said engine to allow the transmission of driving power in only one direction from said engine to said cooling fan, a motor coupled to drive said cooling fan, a motor control means for controlling a supply of electric power to said motor.

2. A driving system according to claim 1, wherein said motor is mounted on the same shaft on which said cooling fan is mounted.

3. A driving system according to claim 1, wherein said motor control means detects the number of revolutions of said engine, whereby said motor is operAted when said detected number of revolutions is lower than a predetermined value.

4. A driving system according to claim 1, wherein said motor control means detects the temperature of said engine, whereby said motor is operated when said detected temperature is higher than a predetermined value.

5. A driving system according to claim 1, wherein said motor comprises a printed motor.

6. A driving system according to claim 1 further comprising a second one-way clutch provided between said cooling fan and said motor to allow the transmission of driving power in only one direction from said motor to said cooling fan.

7. A driving system according to claim 6, wherein said second one-way clutch is mounted on said first one-way clutch.

8. A driving system according to claim 6, wherein said second one-way clutch is mounted on the driving shaft of said motor.