US 9,752,664 B2Granted

Actuator

AssigneeYamaha Hatsudoki Kabushiki Kaisha

InventorsMotonori Kawauchi, Kenji Egashira, Kouji Kawata

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Abstract

An actuator includes M supports to support the rotary shaft, M being an integer equal to or more than 2; and M speed reducers. The Nth support out of the M supports is located at the opposite side of the moving body across the (N−1)th support, N being an integer which is equal to or more than 2 and equal to or less than M. The first speed reducer is connected to the moving body and the first support, receives a movement of the moving body in the axial direction as an input and drives the first support with a reduced drive force that is reduced from the input, and the Nth speed reducer is connected to the (N−1)th support and the Nth support, receives a movement of the (N−1)th support in the axial direction as an input and drives the Nth support with a reduced drive force.

Claims11

Dependent claims

An actuator comprising:

a rotary shaft extending in an axial direction;
a moving body to move in the axial direction along the rotary shaft in response to a rotation of the rotary shaft upon receiving a rotational drive force;
M supports to support the rotary shaft on one side of the moving body, M being an integer equal to or more than 2;
M speed reducers,
wherein an (N−1)th support out of the M supports is located between the moving body and an Nth support out of the M supports, N being an integer which is equal to or more than 2 and equal to or less than M,
a first speed reducer out of the M speed reducers is connected to the moving body and a first support, receives a movement of the moving body in the axial direction as a first input and drives the first support with a first reduced drive force that is reduced from the first input,
an Nth speed reducer is connected to the (N−1)th support and the Nth support, receives a movement of the (N−1)th support in the axial direction as an Nth input and drives the Nth support with an Nth reduced drive force that is reduced from the Nth input,
an actuator main body to support the rotary shaft;
a first device including the first support and the first speed reducer;
and
an Nth device including the Nth support and the Nth speed reducer,
wherein the first speed reducer includes a first input portion to which the movement of the moving body in the axial direction is input and a first output portion which outputs the first reduced drive force to the first device and has a first speed reduction ratio for driving the first support at a first speed which is middle between a speed of the first input portion and a speed of the first output portion;
the Nth speed reducer includes an Nth input portion to which the movement of the (N−1)th support in the axial direction is input and an Nth output portion which outputs the Nth reduced drive force to the Nth device and has an Nth speed reduction ratio for driving the Nth support at an Nth speed which is middle between a speed of the Nth input portion and an axial moving speed of the Nth output portion;
and
the output portion of an Mth speed reducer is connected to the actuator main body.

12 more elements

An actuator comprising:

a rotary shaft extending in an axial direction;
a moving body to move in the axial direction along the rotary shaft in response to a rotation of the rotary shaft upon receiving a rotational drive force;
an actuator main body;
a guide mechanism fixed to the actuator main body;
and
a plurality of resonance suppressing mechanisms including a support to support the rotary shaft on one side of the moving body and a unit to hold the support,
wherein the units are arranged in an arrangement direction orthogonal to the axial direction,
each of the units includes a unit main body that is shaped to extend in a moving direction parallel to the axial direction, guided by the guide mechanism so as to be reciprocally movable with respect to the actuator main body while holding the support and includes a first rotation supporting portion and a second rotation supporting portion, a pair of rotating members that are supported by the first rotation supporting portion and the second rotation supporting portion respectively so as to be rotatable with respect to the unit main body while being spaced apart in the moving direction, and an endless string mounted between the pair of rotating members,
in each of the units an upstream side in the arrangement direction is a side upstream of the pair of rotating members in the arrangement direction, a downstream side in the arrangement direction is a side downstream of the pair of rotating members in the arrangement direction,
in a most upstream unit out of the units in the arrangement direction, the endless string is fixed to the actuator main body at the upstream side in the arrangement direction,
in a most downstream unit out of the units in the arrangement direction, the endless string is coupled to the moving body at the downstream side in the arrangement direction,
in an upstream unit out of two of the units adjacent in the arrangement direction, the endless string is coupled to the unit main body of a downstream unit in the arrangement direction at the downstream side in the arrangement direction and
in a downstream unit out of the two of the units adjacent in the arrangement direction, the endless string is coupled to the unit main body of the upstream unit in the arrangement direction at the upstream side in the arrangement direction.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/530,057Filed 31 Oct 2014
Priority: JP 2013-2285421 Nov 2013
Published: US 2015/0122062 A17 May 2015
Granted: 5 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F16H 25/24
Screw mechanisms: elements essential to such mechanisms, e.g. screws, nuts
F16H 19/0663
Comprising flexible members, e.g. an endless flexible member: with telescopic means, e.g. for supporting or shielding the reciprocating member
F16H 57/0006
General details of gearing: vibration-damping or noise reducing means specially adapted for gearings
F16H 2025/2436
Elements essential to such mechanisms, e.g. screws, nuts: intermediate screw supports for reducing unsupported length of screw shaft