Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-05-14
2004-03-30
Mullins, Burton S. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S012060, C310S020000, C310S037000, C310S112000, C310S080000, C074S02200R, C074S02200R
Reexamination Certificate
active
06713920
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to linear actuators, and more particularly, to a linear actuator capable of inducing a linear motion on a rotor using an angular velocity difference between two rotors.
2. Description of the Related Art
In general, a conventional rotating body needs a linear motor around the rotary shaft of a rotor for linear motion. This linear motor is powered via a power supply path by an external power source. However, such a conventional rotating body suffers from problems in supplying power to the linear motor positioned on the rotor.
A brush is needed to supply power to such a linear motor. However, due to brush wear and damage, the lifetime is shortened, and the waveform of a supply power becomes unstable, increasing the likelihood of noise and vibration occurring when applied to a precise device. Also, the structure using a brush adds complexity to the structure of a product and increases the cost of manufacturing.
A wireless power transmission technique has been considered. However, this wireless technique has a problem of very low transmission rate. In particular, when applied to a storage device or miniature device that is sensitive to external electric fields, the design itself is complicated, and operational efficiency can be remarkably reduced.
SUMMARY OF THE INVENTION
To solve the above-described problems, it is an object of the present invention to provide a linear actuator capable of inducing a linear motion on a rotor with a simple structure without need to mount an additional linear motor as a driving power source on the rotor.
To achieve the object of the present invention, there is provided a linear actuator using two rotors, comprising: first and second rotors connected to respective driving force sources; a linear motion unit formed on the first rotor to be linearly movable; and a driving power transmission unit which is fixed to the second rotor and engages the linear motion unit.
It is preferable that the linear motion unit is coupled to the first rotor by a linear bearing such that the linear motion unit can linearly move. It is preferable that the linear motion unit engages the driving power transmission unit and linearly moves due to a relative angular velocity difference between the first and second rotors. It is preferable that the linear motion unit is a rack, and the driving power transmission unit is a pinion. It is preferable that the first and second rotors are controlled by respective spindle motors such that the first and second rotors rotate at different velocities.
In another embodiment of the present invention, a linear actuator is provided that includes a first rotor; a second rotor, wherein said first and second rotors are connected to respective driving force sources; a linear motion unit formed on the first rotor to be linearly movable; and a driving power transmission unit which is fixed to the second rotor and engages the linear motion unit, wherein the linear motion unit moves linearly by engagement with the driving power transmission unit when the first and second rotor differ in angular velocity.
REFERENCES:
patent: 3194032 (1965-07-01), Von Brimer
patent: 3215206 (1965-11-01), Crow
patent: 3790833 (1974-02-01), Hasebe
patent: 3855487 (1974-12-01), Boisseau
patent: 3948936 (1976-04-01), Cross et al.
patent: 4249453 (1981-02-01), Riggs et al.
patent: 4311080 (1982-01-01), Leonard
patent: 4352299 (1982-10-01), Riggs et al.
patent: 4391574 (1983-07-01), Medel et al.
patent: 4767958 (1988-08-01), Sasaki
patent: 4866458 (1989-09-01), Kimura
patent: 4932276 (1990-06-01), Treadwell et al.
patent: 5159846 (1992-11-01), Warner
patent: 5836205 (1998-11-01), Meyer
patent: 6075298 (2000-06-01), Maue et al.
patent: 6081051 (2000-06-01), Kitazawa et al.
patent: 6137195 (2000-10-01), Chitayat
patent: 6324872 (2001-12-01), Blaszyk et al.
patent: 6343522 (2002-02-01), Hori et al.
patent: 6349679 (2002-02-01), Mashimo et al.
patent: 6392322 (2002-05-01), Mares et al.
patent: 6439104 (2002-08-01), Tonogai et al.
patent: 6474287 (2002-11-01), Babington
patent: 55-93570 (1980-07-01), None
patent: 59-171007 (1984-09-01), None
Byun Yong-kyu
Han Woo-sup
Kang Ji-yoon
Kim Jun-o
Kim Kyu-yong
Aguirrechea J.
Burns Doane , Swecker, Mathis LLP
Mullins Burton S.
Samsung Electronics Co,. Ltd.
LandOfFree
Linear actuator using two rotors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Linear actuator using two rotors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear actuator using two rotors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3234483