SWITCHABLE ROTATION DRIVE DEVICE
First Claim
1. A switchable rotation drive device comprising:
- a motor provided with a hollow rotor;
an output shaft that coaxially pass through a hollow part of the hollow rotor in a rotatable state;
a planetary gear reduction mechanism for reducing rotation of the hollow rotor and transmitting a resulting rotation to the output shaft;
and a switching mechanism that can slide between a high-speed mode position and a low-speed mode position in a direction of a center axis along an outer peripheral surface of the output shaft, whereinthe switching mechanism has a first connecting sleeve and a second connecting sleeve that is coaxially connected to the first connecting sleeve via a bearing so as to rotatable relative with each other, and a sun gear of the planetary gear reduction mechanism is formed on an outer periphery of the first connecting sleeve, and whereinin the high-speed mode position, the output shaft and the hollow rotor form a connected state so as to integrally rotate via the first connecting sleeve; and
in the low-speed mode position, the first connecting sleeve and the output shaft are separated, the sun gear formed on the first connecting sleeve is connected to planetary gears of the planetary gear reduction mechanism, the second connecting sleeve is connected to a planetary carrier, which is an element of the planetary gear reduction mechanism for outputting reduced rotation, whereby the rotation of the hollow rotor is reduced via the planetary gear reduction mechanism and transmitted to the output shaft.
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Accused Products
Abstract
A switchable rotation drive device has a switching mechanism wherein a first connecting sleeve that always rotates integrally with a motor hollow rotor, and a second connecting sleeve that always rotates integrally with a planetary carrier of a planetary gear reduction mechanism are connected via a bearing in a relatively rotatable state, and the first connecting sleeve is formed with a sun gear. By sliding the switching mechanism, the output shaft can be switched between high-speed rotation and low-speed rotation. In comparison to a case in which the entirety of the planetary gear reduction mechanism is made to slide, the sliding region may be smaller, and the required space needed to allow sliding may also be smaller. Therefore, it is advantageous to reduce the size of the device and make it more compact.
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Citations
5 Claims
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1. A switchable rotation drive device comprising:
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a motor provided with a hollow rotor; an output shaft that coaxially pass through a hollow part of the hollow rotor in a rotatable state; a planetary gear reduction mechanism for reducing rotation of the hollow rotor and transmitting a resulting rotation to the output shaft; and a switching mechanism that can slide between a high-speed mode position and a low-speed mode position in a direction of a center axis along an outer peripheral surface of the output shaft, wherein the switching mechanism has a first connecting sleeve and a second connecting sleeve that is coaxially connected to the first connecting sleeve via a bearing so as to rotatable relative with each other, and a sun gear of the planetary gear reduction mechanism is formed on an outer periphery of the first connecting sleeve, and wherein in the high-speed mode position, the output shaft and the hollow rotor form a connected state so as to integrally rotate via the first connecting sleeve; and in the low-speed mode position, the first connecting sleeve and the output shaft are separated, the sun gear formed on the first connecting sleeve is connected to planetary gears of the planetary gear reduction mechanism, the second connecting sleeve is connected to a planetary carrier, which is an element of the planetary gear reduction mechanism for outputting reduced rotation, whereby the rotation of the hollow rotor is reduced via the planetary gear reduction mechanism and transmitted to the output shaft. - View Dependent Claims (2, 3, 4)
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5. (canceled)
Specification