Internal gear set

Claim 2

An internal gear set comprising, in combination, an inner member including a support having a predetermined number of fragmental cylindrical recesses equally spaced about its periphery and a rigid cylindrical tooth member received in each recess in rotational sliding contact therewith, each tooth member having substantially the same diameter as the corresponding recess, a portion of each tooth member projecting from said periphery, and an internally toothed outer member formed as the conjugate of the inner member, having simultaneous rolling engagement with all of the tooth members and having a number of teeth one greater than said predetermined number.

Claim 3

A gear set according to claim 1, in which the outer member has a surface configuration conforming to the outline generated by the projection of the inner member thereon when said members are respectively rotated about spaced parallel axes at a speed ratio equal to the inverse of their tooth ratio.

Claim 4

A gear set according to claim 1, in which the cylinders are captured in the recesses.

Claim 5

An internal gear set comprising in combination, an inner member including a support having a first axis therein, said support having a predetermined number of fragmental cylindrical recesses about its periphery, said recesses being equally spaced radially from and angularly about said axis, and a rigid cylindrical tooth member received in each recess in rotational sliding contact therewith, each tooth member having substantially the same diameter as the corresponding recess, a portion of each tooth member projecting from said periphery, and an internally toothed outer member formed as the conjugate of said inner member, having simultaneous rolling engagement with all of the tooth members, and having a number of teeth one greater than said predetermined number and equally spaced radially from and angularly about a second axis parallel to the first axis and spaced therefrom.

Claim 6

An internal gear set comprising in combination, an inner member including a support having a first axis therein, said support having a predetermined number of fragmental cylindrical recesses about its periphery, said recesses being equally spaced radially from and angularly about said axis, and a rigid cylindrical tooth member received in each recess in rotational sliding contact therewith, each tooth member having substantially the same diameter as the corresponding recess, a portion of each tooth member projecting from said periphery, and an internally toothed outer member formed as the conjugate of said inner member, having simultaneous rolling engagement with all of the tooth members, and having a number of teeth one greater than said predetermined number and equally spaced radially from and angularly about a second axis parallel to the first axis and spaced therefrom.

Claim 7

A gear set according to claim 4, in which the outer member has a surface configuration conforming to the outline generated by the projection of the inner member thereon when said members are rotated about their axes at a speed ratio equal to the inverse of their tooth ratio.

Claim 8

In an internal gear-type fluid-pressure device including a first gear surrounded by and meshed with a second gear, one of said gears having one less tooth than the other gear, said gears being relatively rotatable, one of said gears being mounted for rotation about an axis displaced relative to that of the other gear, said first gear having circumferentially spaced fragmental cylindrical recesses around the outer periphery thereof opening through said outer periphery, cylindrical tooth members mounted in said recesses and projecting beyond said openings through the outer periphery of the first gear to provide the teeth for said first gear, said second gear and the first gear cooperating with the tooth members to form expanding and contracting chambers therebetween, said second gear simultaneously contacting tooth members in all positions of the gears to form seals, and passages communicating with the chambers for flow of fluid into the expanding chambers and out of the contracting chambers.

Claim 9

In an internal gear-type fluid-pressure device including a first gear surrounded by and meshed with a second gear, one of said gears having one less tooth than the other gear, said gears being relatively rotatable, one of said gears being mounted for rotation about an axis displaced relative to that of the other gear, said first gear having circumferentially spaced fragmental cylindrical recesses around the outer periphery thereof opening through said outer periphery, cylindrical tooth members mounted in said recesses and projecting beyond said openings through the outer periphery of the first gear to provide the teeth for said first gear, said second gear and the first gear cooperating with the tooth members to form expanding and contracting chambers therebetween, said second gear simultaneously contacting tooth members in all positions of the gears to form seals, and passages communicating with the chambers for flow of fluid into the expanding chambers and out of the contracting chambers.