Tool driving or impacting – Drive by means reacting to rotating eccentric mass
Patent
1998-06-22
2000-08-22
Smith, Scott A.
Tool driving or impacting
Drive by means reacting to rotating eccentric mass
173 2, B06B 118
Patent
active
061056855
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTIONS
1. Field of the Invention
The invention relates to varying the relative setting angle .beta. of vibration generators having at least two pairs of part unbalance elements that can be adjusted in relation to each other.
2. Description of the Prior Art
Adjustable vibration generators are described in published International Application WO91/08842 and in PCT/EP90/02239. In the description of the present invention, for the purpose of simplification, the same terminology is employed as is used in the last-mentioned publication, relating to the part unbalance elements and the partial centrifugal forces (or partial centrifugal force vectors) associated with such elements, as well as relating to a "pair" of part unbalance elements. By comparison with the publications cited above, the relative setting angle .beta. is defined below in such a way that the value .beta.=0.degree. corresponds to an oscillatory amplitude of zero, and the value .beta.=180.degree. corresponds to a maximum oscillatory amplitude.
The relative setting angle .beta. of an adjustable vibration generator is theoretically defined between the partial centrifugal force vectors of the individual part unbalance elements of a "pair" of part unbalance elements. In practice, it is also possible to define the relative setting angle .beta. between features (for example geometric features) of the part unbalance elements of a pair, provided that the position of the mass center of gravity of the eccentric mass of each element is known. The identifier "MR" is commonly used for the reaction moments "MR" which, during each unbalance rotation through the rotation angle .mu.=2.pi., occur twice as alternating moments at the shafts of the part unbalance elements [these alternating moments have a sinusoidal waveform with two minimum and two maximum values per revolution of the part unbalance element].
The average reaction moments, which act in only one direction and can be calculated by integrating MR over the angle of rotation .mu.=2.pi. and by subsequent division of the integration value by 2.pi., are referred to as "MRQ". As will be apparant to those skilled in the art, for example from above-referenced WO91/08842, in the event of a relative setting angle being set to 0.degree.<.beta.<180.degree., these average reaction moments MRQ act on the part unbalance elements of a pair in such a way that the reaction moments MRQ of one kind try to accelerate the rotation of the part unbalance elements of one kind, and the reaction moments MRQ of the other kind try to retard the rotation of the part unbalance elements of the other kind. In the case of a 4-shaft unbalance vibrator having a motor coupled to each shaft, this mode of operation leads to the situation where, in the case of a vibrator that is operating at idle with a relative setting angle set to be 0.degree.<.beta.<180.degree., two of the motors have to operate as motors and two of the motors have to operate as generators. Reference is made at this point to the fact that, for the description "unbalance moment", further descriptions, such as "static moment" are also known to those skilled in the art.
FIG. 1 of published German Patent Application 43 01 368 shows a hydraulically operated "gearless vibrator" with an adjustable unbalance moment, with the first motors 103 and 104 that belong to the first part unbalance elements and the second motors 107 and 108 that belong to the second part unbalance elements. The first two motors are supplied in parallel and at the same input pressure by a volume flow that is generated by the adjustable pump 114. The second two motors are each connected to a first motor by means of a series circuit. This is a so-called open circuit for the fluid medium.
The range of adjustment for the unbalance moment in the arrangement of DE A 43 01 368 is limited to an angle 0.degree..ltoreq..beta..ltoreq.90.degree.. The vibrator shown is provided with the capability of maintaining the mirror-image synchronous running of the angle of rotation of part unbalanc
REFERENCES:
patent: 4830597 (1989-05-01), Steier et al.
patent: 4971158 (1990-11-01), Salmi
patent: 5281775 (1994-01-01), Gremillion
patent: 5355964 (1994-10-01), White
patent: 5911280 (1999-06-01), Bald
Gedib Ingenieurburo Und Innovationsberatung GmbH
Smith Scott A.
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