Rotational speed reducer

Patent metadata

Field	Value
Publication number	US-10539206-B2
Application number	US-201615740266-A
Country	US
Kind code	B2
Filing date	Jul 8, 2016
Priority date	Jul 13, 2015
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

The present invention relates to an epicyclic speed reducer ( 1 ), comprising a casing ( 4 ) comprising a first ( 2 a ) and a second opening ( 2 b ) arranged on opposite faces of said casing ( 4 ). The casing ( 4 ) houses inside it: a first sun gear ( 20 ) fastened inside the casing ( 4 ) at said first opening ( 2 a ); a second sun gear ( 30 ) coaxial with the first sun gear ( 20 ) with the axis passing from the first opening ( 2 a ) to the second opening ( 2 b ); a first planet gear ( 8 a, 8 b ) adapted to describe a circular orbit around the first sun gear ( 20 ); a second planet gear ( 9 a, 9 b ) adapted to describe a circular orbit around the second sun gear ( 30 ); a supporting element ( 5 ) interposed between the first ( 20 ) and second ( 30 ) sun gear and adapted to rotate around the axis, the supporting element ( 5 ) connected to the first ( 8 a, 8 b ) and second ( 9 a, 9 b ) planet gear in such a way as to allow a relative rotation of the supporting element ( 5 ) with respect to the first ( 8 a, 8 b ) and second ( 9 a, 9 b ) planet gear; a first belt ( 10 ) connected to the first planet gear ( 8 a, 8 b ) and to the first sun gear ( 20 ); a second belt ( 11 ) connected to the second planet gear ( 9 a, 9 b ) and to the second sun gear ( 30 ). Moreover the supporting element ( 5 ) is provided with a seat ( 21 ) coaxial with the axis and adapted to be fitted on one end ( 2 ) of a driving shaft such that when the seat is fitted on the driving shaft the supporting element ( 5 ) and the driving shaft are rigidly connected.

First claim

The invention claimed is:

1. Epicyclic speed reducer ( 1 ) comprising a casing ( 4 ) comprising a first ( 2 a ) and a second opening ( 2 b ) arranged on opposite faces of said casing ( 4 ), and wherein the casing ( 4 ) houses inside it:
a first sun gear ( 20 ) fastened inside the casing ( 4 ) at said first opening ( 2 a ),
a second sun gear ( 30 ) coaxial with the first sun gear ( 20 ) with the axis passing from said first opening ( 2 a ) to said second opening ( 2 b ),
a first planet gear ( 8 a , 8 b ) adapted to describe a circular orbit around said first sun gear ( 20 ),
a second planet gear ( 9 a , 9 b ) adapted to describe a circular orbit around said second sun gear ( 30 ),
a supporting element ( 5 ) interposed between said first ( 20 ) and second ( 30 ) sun gear and adapted to rotate around said axis, said supporting element ( 5 ) connected to said first ( 8 a , 8 b ) and second ( 9 a , 9 b ) planet gear in such a way as to allow a relative rotation of the supporting element ( 5 ) with respect to said first ( 8 a , 8 b ) and second ( 9 a , 9 b ) planet gear,
a first belt ( 10 ) connected to the first planet gear ( 8 a , 8 b ) and to the first sun gear ( 20 ),
a second belt ( 11 ) connected to the second planet gear ( 9 a , 9 b ) and to the second sun gear ( 30 ),

characterized in that the supporting element ( 5 ) is provided with a seat ( 21 ) coaxial with said axis and adapted to be fitted on one end ( 2 ) of a driving shaft such that when the seat is fitted on the driving shaft the supporting element ( 5 ) and the driving shaft are rigidly connected, further comprising a discoid element ( 54 ) provided with a slot ( 541 ), wherein the discoid element ( 54 ) is applied to one surface of the supporting element ( 5 ) orthogonal to said axis by means of a screw-bolt coupling ( 542 ), wherein said screw-bolt coupling ( 542 ) is formed by a screw that passes through said slot and said supporting element, and a bolt engaged with the screw, in such a way that such screw-bolt coupling allows a relative rotation of the discoid element ( 54 ) relative to the supporting element ( 5 ) for a distance corresponding to the length of the slot.

2. Epicyclic speed reducer ( 1 ) according to claim 1 , wherein the supporting element ( 5 ) has two ends ( 50 a , 50 b ) arranged symmetrically to said axis and provided with at least one recess ( 55 a , 55 b ) in which a pin ( 7 a , 7 b ) is inserted, said pin being constrained to the supporting element ( 5 ) through a rotational joint ( 71 a , 71 b ).

3. Epicyclic speed reducer ( 1 ) according to claim 1 , wherein the pin ( 7 a , 7 b ) passes through the supporting element and wherein the first ( 8 a , 8 b ) and the second ( 9 a , 9 b ) planet gear are rigidly constrained to two opposite ends of the pin ( 7 a , 7 b ).

4. Epicyclic speed reducer ( 1 ) according to claim 1 , wherein the discoid element ( 54 ) comprises an internal area ( 54 b ) provided with an eccentric profile, wherein said eccentric profile is maintained in forced contact with a flank of the pin ( 7 a , 7 b ) in such that the rotation of the discoid element ( 54 ) corresponds to a radial translation of the pin ( 7 a , 7 b ) on the supporting element ( 5 ).

5. Epicyclic speed reducer ( 1 ) according to claim 1 , wherein on the slot ( 541 ) an idle gear ( 60 ) is fastened adapted to press a branch of one of the first and second belt ( 10 , 11 ) interposed between a first gripping point of said belt with the respective planet gear and a second gripping point of the belt with the respective sun gear.

6. Epicyclic speed reducer ( 1 ) according to claim 1 , wherein the two belts ( 10 , 11 ) have a flat or “V” or trapezoidal profile.

7. Epicyclic speed reducer ( 1 ) comprising a casing ( 4 ) comprising a first ( 2 a ) and a second opening ( 2 b ) arranged on opposite faces of said casing ( 4 ), and wherein the casing ( 4 ) houses inside it:
a first sun gear ( 20 ) fastened inside the casing ( 4 ) at said first opening ( 2 a ),
a second sun gear ( 30 ) coaxial with the first sun gear ( 20 ) with the axis passing from said first opening ( 2 a ) to said second opening ( 2 b ),
a first planet gear ( 8 a , 8 b ) adapted to describe a circular orbit around said first sun gear ( 20 ),
a second planet gear ( 9 a , 9 b ) adapted to describe a circular orbit around said second sun gear ( 30 ),
a supporting element ( 5 ) interposed between said first ( 20 ) and second ( 30 ) sun gear and adapted to rotate around said axis, said supporting element ( 5 ) connected to said first ( 8 a , 8 b ) and second ( 9 a , 9 b ) planet gear in such a way as to allow a relative rotation of the supporting element ( 5 ) with respect to said first ( 8 a , 8 b ) and second ( 9 a , 9 b ) planet gear,
a first belt ( 10 ) connected to the first planet gear ( 8 a , 8 b ) and to the first sun gear ( 20 ),
a second belt ( 11 ) connected to the second planet gear ( 9 a , 9 b ) and to the second sun gear ( 30 ), characterized in that the supporting element ( 5 ) is provided with a seat ( 21 ) coaxial with said axis and adapted to be fitted on one end ( 2 ) of a driving shaft such that when the seat is fitted on the driving shaft the supporting element ( 5 ) and the driving shaft are rigidly

connected, wherein the supporting element ( 5 ) supports two groups of four planet gears ( 8 a , 8 b , 8 c , 8 d , 9 a , 9 b , 9 c , 9 d ), wherein the first belt ( 10 ) meshes the first sun gear ( 20 ) and at least one planet gear of a first group ( 8 a , 8 b , 8 c , 8 d ) of said two groups, and wherein the second belt ( 11 ) meshes the second sun gear ( 30 ) and at least one planet gear of a second group ( 9 a , 9 b , 9 c , 9 d ) of said two groups, wherein the belts ( 10 , 11 ) have a toothed profile on both faces and each one meshes one or more planet gears of a respective group.

Assignees

• Fondazione St Italiano Tecnologia
• Inail Istituto Naz Assicurazione Contro Gli Infortuni Sul Lavoro
• Fondazione Istituto Italiano Di Tech

Inventors

• Bibolotti Alberto

Classifications

• F16H7/02

  with belts; with V-belts · CPC title

• F16H2007/0865

  Pulleys · CPC title

• F16H9/26

  with members having orbital motion · CPC title

• F16G1/28

  with a contact surface of special shape, e.g. toothed · CPC title

• F16H57/082

  Planet carriers · CPC title