Electrical generator or motor structure – Dynamoelectric – Oscillating
Reexamination Certificate
2000-03-09
2001-01-30
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Oscillating
C277S407000, C092S125000
Reexamination Certificate
active
06181034
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a radial oscillating motor having a stator in a housing, a stator wing being disposed in the housing. A rotor having a driven shaft is supported in the housing and associated therewith is an identical number of rotor wings. The stator wing and the rotor wing in conjunction with the housing, the cylinder portion of the drive shaft and the two covers form a pressure chamber and one discharge chamber, which are sealed towards the inside by a frame sealing element which is inserted in the stator wing and the rotor wing, and which are sealed towards the outside and the inside by an annular sealing element. Further, a bearing, which has a pressure relief, is disposed in each cover of the stator between two sealing locations.
Such oscillating motors are used in particular in the aircraft and vehicle industry.
2. Description of the Related Art
DE 32 22 982 A1 describes a radial oscillating motor consisting of, for example, a housing, which has inside at least one stator wing and is closed off at the ends with covers, and a rotor which includes a driven shaft supported in the covers and at least one rotor wing. The rotor wing can oscillate within certain limits inside a free space in the housing and forms with the stator wing of the housing at least one pressure chamber and one discharge chamber. To ensure the internal leak-tightness between the pressure chamber and the discharge chamber, the stator wing and the rotor wing are provided with a form-fitting sliding sealing element which seals against the lateral covers and the radial housing wall and the driven shaft, respectively. To ensure external leak-tightness between the rotor and each cover, a sliding sealing ring which can be supported in the respective cover as well as in the rotor, is typically mounted on the driven shaft.
A number of other embodiments and modifications are possible.
The driven shaft is secured on the side of the journal by an additional sealing ring which can be fabricated from different rotary shaft seals.
Bearings are arranged on both sides of the driven shaft between the shaft seals, with overflow oil lines arranged in the region of the bearings for returning to the tank the leaked oil accumulating between the shaft seals. This arrangement not only protects the bearings and the sealing elements from an excessive pressure load, but also prevents damage to the bearings and the sealing elements and eliminates an excessive initial torque on the oscillating motor. The overflow oil lines are also provided with devices which maintain the leaked oil flow at a predetermined pressure, so that sufficient hydraulic oil is supplied to the bearings for lubrication.
Overflow lines of this type are technically required, but are implemented only reluctantly since technically complex devices and facilities are required which add to the cost. Moreover, a great number of pipes are required which significantly limits the application of the oscillating motors because of the limitations imposed by the mounting conditions.
In certain applications, it is disadvantageous to remove the overflow oil from the oscillating motor, for example, when the control system for the oscillating motor is malfunctioning and the rotor has to be kept in a fixed position. Leakage typically causes the rotor to yield to an externally applied load which may pose a safety risk.
It is therefore the object of the invention to develop a radial oscillating motor of the aforedescribed type without overflow oil lines and with bearings which operate at a reduced pressure while still receiving a sufficient quantity of lubricating oil.
SUMMARY OF THE INVENTION
The invention eliminates the aforedescribed disadvantages found in the state in the art.
The invention can be easily implemented by using simple manufacturing methods and using a simple non-return valve and can therefore be manufactured at low cost.
The invention also has particularly advantages applications. Unlike an external overflow oil line, the invention represents a very elegant solution which allows the oscillating motor to be used in finished products offering only limited mounting spaces.
As a further advantage, the opening pressure of the non-return valve can be set so that the pressure, which builds up before the non-return valve, provides an adequate supply of lubricating oil for the bearing. This protects the bearings and extends the useful life of the bearing and the seal.
In an alternative advantageous embodiment, a separate non-return valve can be provided for each bearing, or a common non-return valve can be provided for all bearings. In this way, the invention can be easily adapted to oscillating motors of different designs.
According to a particularly advantageous embodiment, both bearings are continuously connected to the discharge chamber as well as to the pressure chamber. Since the function of the discharge chamber alternates with that of the pressure chamber, both bearings are continuously connected to the discharge chamber independent of their function. This arrangement prevents a pressure build-up on one of the two bearings if one oscillating direction has to be maintained over an extended time.
The invention will now be described in detail with reference to two embodiments.
REFERENCES:
patent: 2781027 (1957-02-01), Henry
patent: 1 553 077 (1966-08-01), None
patent: 22 28 531 C2 (1973-02-01), None
patent: 32 22 982 A1 (1982-06-01), None
patent: 44 07 308 C1 (1995-08-01), None
patent: 195 03 331C1 (1996-08-01), None
patent: 0 388 711 A1 (1990-09-01), None
patent: 0 362 534 B1 (1994-03-01), None
59074059 Apr. 13, 1984 Japanese abstract Patent Abstract of Japan, vol. 010, No. 077 (M-464) Mar. 26, 1986 & JP 60 220209 A.
Beetz Stefan
Reichel Klaus
Darby & Darby
Jones Judson H.
PNP Luftfedersysteme GmbH
Ramirez Nestor
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