192 clutches and power-stop control – Clutch and brake – Sliding operation
Patent
1997-07-31
1999-06-22
Bonck, Rodney H.
192 clutches and power-stop control
Clutch and brake
Sliding operation
192 7012, 19211334, F16D 6704, F16D 6578
Patent
active
059133945
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the construction of coupling elements in machines for deforming.
BACKGROUND OF THE INVENTION
With the known hydraulically operated coupling elements (clutches and brakes) through which coolant and lubricant oil is circulated, the flow in the clutch and brake of the oil is mainly left to the effect of gravity on the oil. There are also systems wherein the rotating clutch housing forms inside the housing an inertially acting oil ring. The dip tube projecting from this oil ring produces the oil circulation to the coupling elements, that is through the brake housing and the mount (tube shaft). Naturally it is a disadvantage that in order to create sufficient centrifugal force to pump the oil a certain minimum rotation rate is necessary. Thus this solution is limited to coupling elements with a high rotation rate (control drives, drives on slow shafts, e.g. eccentric shafts).
In addition the effectiveness is very strongly dependent on temperature because of the viscosity characteristics of the oil used for cooling and lubricating. As a result on starting up the apparatus and when the oil is cold there are substantial problems in the coupling operation (sticking of the oil-bathed disks on braking to produce a pulsation) and in the seal of the coupling elements that are relatively sealed with a labyrinth. As a result of the poorer oil flow on startup it can happen in extreme cases that the entire oil content of the container serving to drive the coupling elements (hydraulic supply) is forced into the coupling elements and thus the monitored oil level in the container causes the machine to shut down even before oil circulation has started. This is countered by providing expensive heating systems for preheating the oil along with large-capacity supplies.
OBJECTS AND SUMMARY OF THE INVENTION
The goal of the invention is to produce a rotation-speed and temperature independent circulation of coolant and lubricant oil with the known coupling elements which makes possible a machine operation free of the above-named service problems and which increases the applicability of the coupling elements with rotating clutch housings in the region of lower rotation speeds.
The object of the invention is to provide an apparatus that surely circulates oil through the coupling elements and thus increases the usability of the coupling element as well as its service life. According to the invention inside the rotating clutch housing is a row of teeth which drives an oil pump via a pinion.
BRIEF DESCRIPTION OF THE DRAWING
A preferred embodiment of the invention is shown more closely in the drawing.
SPECIFIC DESCRIPTION
The flywheel 1 (or drive wheel) is rotatably mounted on the tube shaft 12 and drives the clutch part of the clutch-brake unit 9 via the continuously rotating clutch housing 2.
The brake part of 9 is rotationally arrested by the brake housing 4 and the tube shaft 12. To switch on (engage the clutch) hydraulic oil under pressure moves via the clutch-oil connection 7 through the output shaft 6 into 9, switching off (braking) is done by spring force in the brake when the fluid pressure is relieved. The coolant-circulating path 8 is formed also by bores in the output shaft 6, the oil serving for a continuous cooling and lubrication of the coupling parts and flows out of the clutch-brake unit 9 at the edge of the rotating clutch housing 2. Fixed to the brake housing 4 or constituted only as a pump impeller in the brake housing 4 is an oil pump 10 (e.g. a vane pump). The pump is driven continuously by a pinion 11 via the row of teeth 3. The transmission ratio between 3 and 11 determines an optimal conformity of the amount conveyed by the pump 10 to the amount of oil to be carried off via a passage 5. Thus the circulation of the oil from the hydraulic supply to the coupling elements in the machine and back remains constant because it is taken care of by the pump 10.
1. An apparatus comprising: brake part; juxtaposed with the brake part; inner end inside the clutch part;
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Gober Norbert
Kreisl Joachim
Bonck Rodney H.
Dubno Herbert
SMS Eumuco GmbH
Wilford Andrew
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