Continuously variable transmission

• US 20030144105A1
• Filed: 01/28/2002
• Published: 07/31/2003
• Est. Priority Date: 01/28/2002
• Status: Active Grant

• Current Assignee: Oʼhora, Gerard M.
• Original Assignee: Oʼhora, Gerard M.
• Inventors: OʼHora, Gerard M.
• Granted Patent: US 6,709,355 B2
• Time in Patent Office: Days
• US Class Current: 475/193
• CPC Class Codes: F16H 3/423 the teeth being arranged on a surface of generally conical shape
• CPC Class Codes: Y10T 74/1934 Tumbler and cone

Abstract

A Continuously Variable Transmission (CVT) that uses a gear which changes gear size, along with an innovative gear train to achieve different gear ratios. The CVT overcomes the disadvantages of other designs, as it is a purely mechanical drive system. The CVT is an electro-hydraulically operated device, allowing infinite precision and control, using custom configurations, based on information from engine management systems installed in most modem vehicles. The CVT provides improved vehicle fuel efficiency, acceleration, ease of vehicle drivability and increased power transfer. The CVT minimizes engine stress due to a lower range of revolutions. Also, stress on the vehicle'"'"'s drive-train is minimized, as there is no sudden transition in drive-shaft RPM as the gears change. The CVT allows an engine to run at an optimal range for fuel efficiency and torque, as the engine no longer has to cycle through the normal range of revs as the gears change.

Claims

1. A transmission comprising:

an input to be connected to a power source;

at least one conical shaped gear;

at least one variable ratio gear, said at least one variable ratio gear engaged with said at least one conical shaped gear, said at least one variable ratio gear able to change gear size along said at least one conical shaped gear; and

at least one variable ratio gear adjustment device for each of said at least one variable ratio gear which interacts with said at least one variable ratio gear to change said gear size.

2. The transmission of claim 1, wherein said at least one variable ratio gear is a ring shaped collar with an open center;

wherein said at least one variable ratio gear includes adjustable gear teeth which change the gear size of said at least one variable ratio gear;

wherein said at least one variable ratio gear adjustment device is a conical shaped device which inserts into said open center of said collar, such that said collar moves along a height of said conical shaped device to change gear size; and

wherein said variable ratio gear adjustment device is linked to said adjustable gear teeth which adjust in size based on movement of said collar along said conical shaped device.

3. The transmission of claim 2, wherein said conical shaped device includes pin slots running along said height of said conical shaped device;

wherein said collar includes a plurality of ring slots through and about said ring;

wherein said adjustable gear teeth are sliding pins, each of said sliding pins having a slot end and a tooth end;

wherein each of said sliding pins are slidably inserted into said ring slots to form said adjustable teeth and are movable in said ring slots;

wherein said slot end of each of said sliding pins engages one of said pin slots of said conical shaped device;

wherein said tooth end of each of said sliding pins extends outward from said collar to engage said at least one conical shaped gear.

4. The transmission of claim 2, wherein said at least one conical shaped gear is a conically shaped helical gear.

5. The transmission of claim 3, wherein said at least one conical shaped gear is a conically shaped helical gear.

6. A transmission comprising:

a transmission housing;

an input inside said transmission housing to be connected to a power source;

an input conical shaped gear inside said transmission housing connected to said input;

an input variable ratio gear inside said transmission housing, said input variable ratio gear engaged with said input conical shaped

gear, said input variable ratio gear able to change gear size along said input conical shaped gear;

an input variable ratio gear adjustment device which interacts with said input variable ratio gear to change said gear size;

an input transfer gear connected to and rotating with said input variable ratio gear;

an output inside said transmission housing to be connected to a load;

an output conical shaped gear inside said transmission housing connected to said output;

an output variable ratio gear inside said transmission housing, said output variable ratio gear engaged with said output conical shaped gear, said output variable ratio gear able to change gear size along said output conical shaped gear;

an output variable ratio gear adjustment device which interacts with said output variable ratio gear to change said gear size;

an output transfer gear connected to and rotating with said output variable ratio gear; and

wherein said input and output transfer gears are interconnected such that rotation of said input produces rotation of said output.

7. The transmission of claim 6, wherein said input and output variable ratio gears each are a ring shaped collar with an open center;

wherein said input and output variable ratio gears each include adjustable gear teeth which change the gear size of said input and output variable ratio gears;

wherein said input and output variable ratio gear adjustment devices are each a conical shaped device which inserts into said open center of said collar, such that said collar moves along a height of said conical shaped device to change gear size; and

wherein said input and output variable ratio gear adjustment devices are each linked to said adjustable gear teeth which adjust in size based on movement of said collar along said conical shaped device.

8. The transmission of claim 7, wherein said conical shaped device includes pin slots running along said height of said conical shaped device;

wherein said collar includes a plurality of ring slots through and about said ring;

wherein said adjustable gear teeth are sliding pins, each of said sliding pins having a slot end and a tooth end;

wherein each of said sliding pins are slidably inserted into said ring slots to form said adjustable teeth and are movable in said ring slots;

wherein said slot end of each of said sliding pins engages one of said pin slots of said conical shaped device;

wherein said tooth end of each of said sliding pins extends outward from said collar to engage said at least one conical shaped gear.

9. The transmission of claim 7, wherein said at least one conical shaped gear is a conically shaped helical gear.

10. The transmission of claim 8, wherein said at least one conical shaped gear is a conically shaped helical gear.

11. The transmission of claim 8, wherein said input and output transfer gears are interconnected by a gear train of at least two interconnected gears.

12. The transmission of claim 8, wherein said transmission housing includes guide track for each of said input and output variable ratio gears to allow lateral movement said input and output variable ratio gears during changing of said gear size.

13. A transmission comprising:

a transmission housing;

an input inside said transmission housing to be connected to a power source;

an input conical shaped gear inside said transmission housing connected to said input;

an input variable ratio gear inside said transmission housing, said input variable ratio gear engaged with said input conical shaped gear, said input variable ratio gear able to change gear size along said input conical shaped gear;

an input variable ratio gear adjustment device which interacts with said input variable ratio gear to change said gear size;

an output inside said transmission housing to be connected to a load;

an output conical shaped gear inside said transmission housing connected to said output;

an output variable ratio gear inside said transmission housing, said output variable ratio gear engaged with said output conical shaped gear, said output variable ratio gear able to change gear size along said output conical shaped gear;

an output variable ratio gear adjustment device which interacts with said output variable ratio gear to change said gear size; and

a transfer unit interconnected between said input and output variable ratio gears, said transfer unit comprising;

a first transfer shaft having a first and second end, said first end connected to said input variable ratio gear;

a first transfer variable ratio gear connected to said second end of said first transfer shaft;

a first transfer variable ratio gear adjustment device which interacts with said first transfer variable ratio gear to change said gear size of said first transfer variable ratio gear;

a first transfer conical shaped gear engaged with said first transfer variable ratio gear, said first transfer variable ratio gear able to change gear size along said first transfer conical shaped gear;

a second transfer shaft having a first and second end, said first end connected to said first transfer conical shaped gear;

a second transfer conical shaped gear connected to said second end of said second transfer shaft;

a second transfer variable ratio gear engaged with said second transfer conical shaped gear, said second transfer variable ratio gear able to change gear size along said second transfer conical shaped gear;

a second transfer variable ratio gear adjustment device which interacts with said second transfer variable ratio gear to change said gear size of said second transfer variable ratio gear; and

a third transfer shaft having a first and second end, said first end connected to said second transfer variable ratio gear and said second end connected to said output variable ratio gear.

14. The transmission of claim 13, wherein at least two of said transfer unit are interconnected between said input and output variable ratio gears, said second end of said third transfer shaft of said first transfer unit being connected to said first transfer variable ratio gear of said second transfer unit, and said second end of said third transfer shaft of said second transfer unit being connected to said output variable ratio gear.

15. The transmission of claim 13, wherein said variable ratio gears each are a ring shaped collar with an open center;

wherein said variable ratio gears each include adjustable gear teeth which change the gear size of said variable ratio gears;

wherein said variable ratio gear adjustment devices are each a conical shaped device which inserts into said open center of said collar, such that said collar moves along a height of said conical shaped device to change gear size; and

wherein said variable ratio gear adjustment devices are each linked to said adjustable gear teeth which adjust in size based on movement of said collar along said conical shaped device.

16. The transmission of claim 15, wherein said conical shaped device includes pin slots running along said height of said conical shaped device;

wherein said collar includes a plurality of ring slots through and about said ring;

wherein said adjustable gear teeth are sliding pins, each of said sliding pins having a slot end and a tooth end;

wherein each of said sliding pins are slidably inserted into said ring slots to form said adjustable teeth and are movable in said ring slots;

wherein said slot end of each of said sliding pins engages one of said pin slots of said conical shaped device;

wherein said tooth end of each of said sliding pins extends outward from said collar to engage said at least one conical shaped gear.

17. The transmission of claim 15, wherein said conical shaped gears are each a conically shaped helical gear.

18. The transmission of claim 16, wherein said conical shaped gears are each a conically shaped helical gear.

19. The transmission of claim 14, wherein said variable ratio gears each are a ring shaped collar with an open center;

wherein said variable ratio gears each include adjustable gear teeth which change the gear size of said variable ratio gears;

wherein said variable ratio gear adjustment devices are each a conical shaped device which inserts into said open center of said collar, such that said collar moves along a height of said conical shaped device to change gear size; and

wherein said variable ratio gear adjustment devices are each linked to said adjustable gear teeth which adjust in size based on movement of said collar along said conical shaped device.

20. The transmission of claim 19, wherein said conical shaped device includes pin slots running along said height of said conical shaped device;

wherein said collar includes a plurality of ring slots through and about said ring;

wherein said adjustable gear teeth are sliding pins, each of said sliding pins having a slot end and a tooth end;

wherein each of said sliding pins are slidably inserted into said ring slots to form said adjustable teeth and are movable in said ring slots;

wherein said slot end of each of said sliding pins engages one of said pin slots of said conical shaped device;

wherein said tooth end of each of said sliding pins extends outward from said collar to engage said at least one conical shaped gear.