Power transmitting device

Patent metadata

Field	Value
Publication number	US-11326650-B2
Application number	US-201716498815-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Mar 29, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A power transmitting device includes a first rotor and a second rotor rotatably disposed coaxially with a rotational central axis and in facing relation to each other, a single arc spring that is elastically deformable to a large extent and has a small modulus of elasticity, the arc spring being interposed between the first rotor and the second rotor for urging the first rotor and the second rotor to opposite sides in a ration direction, a first pressing protrusion projecting from the first rotor and a second pressing protrusion projecting from the second rotor, the first pressing protrusion and the second pressing protrusion being disposed in relative positions on superposed rotation trajectories, and a rubber member that is elastically deformable to a small extent and has a large modulus of elasticity, the rubber member being interposed between the first pressing protrusion and the second pressing protrusion with gaps therebetween.

First claim

The invention claimed is:

1. A power transmitting device comprising:
a first rotor and a second rotor that are rotatably disposed coaxially with a rotational central axis- and in facing relation to each other;
a single arc spring that is elastically deformable to an extent and has a modulus of elasticity, the arc spring being interposed between the first rotor and the second rotor for urging the first rotor and the second rotor to opposite sides in a rotation direction;
a first pressing protrusion projecting from the first rotor and a second pressing protrusion projecting from the second rotor, the first pressing protrusion and the second pressing protrusion being disposed in relative positions on superposed rotation trajectories; and
a rubber member that is elastically deformable to a smaller extent than the arc spring and has a larger modulus of elasticity than the arc spring, the rubber member being interposed between the first pressing protrusion and the second pressing protrusion with gaps therebetween;
wherein:
the first rotor and the second rotor have a first housing groove and a second housing groove of an identical arcuate shape, defined respectively in a first facing surface and a second facing surface thereof that are disposed closely to each other and in facing relation to each other;
the arc spring has halves, housed respectively in the first housing groove and the second housing groove, and is interposed between the first rotor and the second rotor, and
the rubber member is fitted over either the first pressing protrusion or the second pressing protrusion.

2. The power transmitting device as claimed in claim 1 ,
wherein the first rotor has:
an arcuate groove defined in the first facing surface on substantially the same circumference as the first housing groove;
a pair of the first pressing protrusions disposed in the arcuate groove respectively near circumferentially opposite ends of the arcuate groove; and
the rubber member fitted over each of the first pressing protrusions; and
the second rotor has:
the second housing groove being open in the second facing surface; and
the second pressing protrusion projecting from a nearly circumferentially central portion of an arcuate area of the second facing surface that corresponds to the arcuate groove.

3. The power transmitting device as claimed in claim 2 , wherein the rubber member fitted over each of the first pressing protrusions is housed in the arcuate groove.

4. The power transmitting device as claimed in claim 3 , wherein the first rotor is of a disk shape and has a pair of the arcuate grooves defined therein opposite portions of the first housing groove across the rotational central axis;
the first rotor has a machining margin for unbalance adjustment behind the first housing groove that houses one-half of the arc spring therein; and
the second rotor is of a disk shape and has a machining margin for unbalance adjustment opposite the second housing groove across the rotational central axis.

5. The power transmitting device as claimed in claim 4 , wherein
the first rotor includes an internal-combustion-engine-side rotor with power being transmittable between itself and a crankshaft of an internal combustion engine;
the second rotor includes a starter-generator-side rotor with power being transmittable between itself and an input/output shaft of a starter generator;
the first pressing protrusion includes an internal-combustion-engine-side pressing protrusion; and
the second pressing protrusion includes a starter-generator-side pressing protrusion.

6. The power transmitting device as claimed in claim 3 , wherein
the first rotor includes an internal-combustion-engine-side rotor with power being transmittable between itself and a crankshaft of an internal combustion engine;
the second rotor includes a starter-generator-side rotor with power being transmittable between itself and an input/output shaft of a starter generator;
the first pressing protrusion includes an internal-combustion-engine-side pressing protrusion; and
the second pressing protrusion includes a starter-generator-side pressing protrusion.

7. The power transmitting device as claimed in claim 6 , wherein the starter-generator-side pressing protrusion that is disposed between a pair of the rubber members fitted respectively over a pair of the internal-combustion-engine-side pressing protrusions is positioned closer to one of the rubber members that is spaced from the starter-generator-side pressing protrusion in the direction of rotation when no relative torque load is applied to the internal-combustion-engine-side rotor and the starter-generator-side rotor.

8. The power transmitting device as claimed in claim 7 , wherein
the starter-generator-side rotor has a tubular shaft projecting from a central portion thereof through the internal-combustion-engine-side rotor and having the rotational central axis as a central axis;
a helical gear is slidably supported on the tubular shaft on a side thereof opposite the starter-generator-side rotor across the internal-combustion-engine-side rotor;
the internal-combustion-engine-side rotor that faces the starter-generator-side rotor is fixed to the helical gear; and
a disk spring is interposed between a collar that is prevented from sliding by a stopper that engages an outer circumference of the tubular shaft on an opposite side of the internal-combustion-engine-side rotor with respect to the helical gear and the helical gear.

9. The power transmitting device as claimed in claim 6 , wherein
the starter-generator-side rotor has a tubular shaft projecting from a central portion thereof through the internal-combustion-engine-side rotor and having the rotational central axis as a central axis;
a helical gear is slidably supported on the tubular shaft on a side thereof opposite the starter-generator-side rotor across the internal-combustion-engine-side rotor;
the internal-combustion-engine-side rotor that faces the starter-generator-side rotor is fixed to the helical gear; and
a disk spring is interposed between a collar that is prevented from sliding by a stopper that engages an outer circumference of the tubular shaft on an opposite side of the internal-combustion-engine-side rotor with respect to the helical gear and the helical gear.

10. The power transmitting device as claimed in claim 9 , wherein the helical gear has such a thread helix that when the helical gear operates as a drive gear, the helical gear produces a thrust force for pressing the internal-combustion-engine-side rotor against the starter-generator-side rotor.

11. A power transmitting device comprising:
a first rotor and a second rotor that are rotatably disposed coaxially with a rotational central axis and in facing relation to each other;
a single arc spring that is elastically deformable to an extent and has a modulus of elasticity, the arc spring being interposed between the first rotor and the second rotor for urging the first rotor and the second rotor to opposite sides in a rotation direction;
a first pressing protrusion projecting from the first rotor and a second pressing protrusion projecting from the second rotor, the first pressing protrusion and the second pressing protrusion being disposed in relative positions on superposed rotation trajectories; and
a rubber member that is elastically deformable to a smaller extent than the arc spring and has a larger modulus of elasticity than the arc spring, the rubber member being interposed between the first pressing protrusion and the second pressing protrusion with gaps therebetween;
wherein the rubber member is fitted over either the first pressing protrusion or the

Assignees

• Honda Motor Co Ltd

Inventors

• Mori Hidemichi
• Yokota Hiroshi
• Deguchi Toshiaki
• Osaki Yusuke
• Nojima Satoru
• Murakami Soichiro
• Sugio Daisuke
• Hatta Takuya

Classifications

• F16F2228/06

  Stiffness · CPC title

• F16F15/123 Primary

  Wound springs {(F16F15/1213, F16F15/1216, F16F15/127 take precedence)} · CPC title

• F16F15/1245

  Elastic elements arranged between substantially-radial walls of two parts rotatable with respect to each other, e.g. between engaging teeth · CPC title

• F16F15/124

  Elastomeric springs (F16F15/123, {F16F15/127} take precedence) · CPC title

• F16D3/66 Primary

  the elements being metallic, e.g. in the form of coils · CPC title