Continuously variable transmission

• US 6,322,475 B2
• Filed: 03/30/2001
• Issued: 11/27/2001
• Est. Priority Date: 09/02/1997
• Status: Expired due to Fees

• Current Assignee: Enviolo BV
• Original Assignee: Donald C. Miller
• Inventors: Miller, Donald C.
• Primary Examiner(s): Hannon, Thomas R.
• Assistant Examiner(s): Joyce, William C
• Application Number:
  US09/823,620
• Publication Number:
  US 20010011049A1
• Time in Patent Office: 242 Days
• Field of Search: 476/5, 476/36, 476/38, 476/62, 74/64, 280/236, 280/238, 475/186, 475/189
• US Class Current: 476/5
• CPC Class Codes: B62K 3/002 without a seat, i.e. the rider operating the vehicle in a standing position, e.g. non-motorized scooters; non-motorized scooters with skis or runners
• CPC Class Codes: B62K 3/005 Recumbent-type bicycles
• CPC Class Codes: B62M 11/12 with frictionally-engaging wheels B62M11/14 takes precedence
• CPC Class Codes: B62M 11/16 built in, or adjacent to, the ground-wheel hub
• CPC Class Codes: F16H 15/28 with external friction surface
• CPC Class Codes: F16H 61/664 Friction gearings
• CPC Class Codes: F16H 63/067 mechanical actuating means

Abstract

A continuously variable transmission. The transmission includes a plurality of power adjusters, such as spherical balls, frictionally interposed between a driving and a driven member. The driving and the driven member are each rotatably disposed over a main shaft. The spherical balls are configured to rotate about a modifiable axis and thereby provide a continuously variable shifting capability by adjusting the ratio between the angular velocity of the driving member in relation to the driven member. The system includes automatic and manual shifting gearing for adjusting the speed of the transmission. The system also includes a support a support member which is rotatably disposed over the main shaft and frictionally engaged to each of the spherical balls.

Claims

1. An automatic shifting transmission comprising:

a rotatable driving member;

a plurality of spherical power adjusters, each spherical power adjuster having a central bore;

a plurality of spindles, one of the spindles inserted through one of the bores of the spherical power adjusters;

a substantially cylindrical rotatable support member that is in frictional contact with each of the spherical power adjusters;

at least one outwardly extendable weight operably connected to at least one of the spindles; and

at least one flexible tension member operably connecting the at least one weight to at least one of the spindles.

2. The transmission of claim 1, wherein the outwardly extendable weight moves radially in response to variations in a centrifugal force that is applied to the weight, and wherein an increase in the centrifugal force causes the transmission to shift to a higher speed.

3. The transmission of claim 1, further comprising an annular bearing, the annular bearing moving in response to radial movement of the at least one weight and thereby causing a shift in the transmission.

4. The transmission of claim 3, further comprising at least two flexible tension members, at least one first flexible tension member connecting the at least one outwardly extendable weight to the annular bearing, the at least one second flexible tension member connecting the annular bearing to at least one spindle.

5. The transmission of claim 4, further comprising a tension member, the tension member biasing the shifting of the transmission in a first direction, the at least one outwardly extendable weight biasing the shifting of the transmission in a second direction.

6. The transmission of claim 5, further comprising a rotatable wheel and a hub shell, the wheel having at least one hollow spoke, wherein the hub shell is fixedly attached to the wheel and wherein at least one of the extendible weights is positioned within the hollow spoke.

7. The transmission of claim 6, further comprising at least one tension member for each outwardly extendable weight, the at least one tension member attached at a first end to the at least one outwardly extendable weight and operably attached to the rotatable wheel at a second end, the at least one tension member outwardly biasing the extendable weight.

8. The transmission of claim 4, further comprising a plurality of flexible tension member guides, at least one flexible tension member guide directing the path of the at least one first flexible tension member, at least one flexible tension member guide directing the path of the at least one second flexible tension member.

9. The transmission of claim 8, further comprising additional flexible tension member guides, at least one flexible tension member guide operably attached to each of the spindles.

10. The transmission of claim 1, further comprising a rotatable annular bearing, the annual bearing comprising;

ball or roller bearings;

a first race for the ball or roller bearings; and

a second race for the ball or roller bearings.

11. The transmission of claim 10, wherein at least one flexible tension member connects the at least one outwardly extendable weight to the first race, and at least one flexible tension member operably connects the second race to at least one spindle.

12. The transmission of claim 11, wherein the rotatable annular bearing moves axially in response to the radial movement of at least one outwardly extendable weight.

13. The transmission of claim 12, wherein the rotatable annular bearing surrounds the plurality of spherical power adjusters and has an inside diameter that is greater than the circumference enclosing the plurality of power adjusters.