Chain tensioning device
First Claim
1. A hydraulic tensioning device comprising:
- cylinder means for housing;
means, associated with said cylinder means, for fixing said cylinder means;
tappet means for coupling said tensioning device to an apparatus to be tensioned;
means for translating vibrational forces transmitted to said tappet means into a tensioning force tending to extend said tappet means, located within said means for housing;
includinga piston assembly arranged within said cylinder exhibiting a piston base defining a primary cylinder chamber;
a tappet piston arranged within said piston assembly and defining an auxiliary cylinder chamber;
means for drawing hydraulic fluid into said auxiliary cylinder chamber and pumping said hydraulic fluid into said primary cylinder chamber upon reciprocation of said tappet piston, located within said piston assembly; and
means for limiting said tensioning force by idling said means for drawing, upon attainment of a predetermined pressure in said auxiliary cylinder chamber.
1 Assignment
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Accused Products
Abstract
A hydraulic tensioning device for tracked vehicles comprising a hydraulically chargeable piston-cylinder unit, coupled on one end with the body of the vehicle, and with the other end to a guide wheel for the track chain which is supported on a rocker arm. In order to obtain the proper track chain tension in any operating condition without providing a separate hydraulic pump, the piston unit is equipped with a tappet supported against the piston unit by means of a spring unit. The tappet closes off a secondary cylinder chamber in the piston unit which is connected with the principal cylinder chamber by two check valves which seal in opposite directions. The tappet effects a pumping action as the result of the vibration generated by the chain links running in and out the guide wheel, thereby pumping the hydraulic oil from a hydraulic oil reservoir into the secondary cylinder chamber and from there into the principal cylinder chamber.
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Citations
20 Claims
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1. A hydraulic tensioning device comprising:
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cylinder means for housing; means, associated with said cylinder means, for fixing said cylinder means; tappet means for coupling said tensioning device to an apparatus to be tensioned; means for translating vibrational forces transmitted to said tappet means into a tensioning force tending to extend said tappet means, located within said means for housing;
includinga piston assembly arranged within said cylinder exhibiting a piston base defining a primary cylinder chamber; a tappet piston arranged within said piston assembly and defining an auxiliary cylinder chamber;
means for drawing hydraulic fluid into said auxiliary cylinder chamber and pumping said hydraulic fluid into said primary cylinder chamber upon reciprocation of said tappet piston, located within said piston assembly; and
means for limiting said tensioning force by idling said means for drawing, upon attainment of a predetermined pressure in said auxiliary cylinder chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A hydraulic tensioning device for tracked vehicles having a trough, guide wheel which functions as a running gear, and a rocker arm for bearingly and adjustably supporting the guide wheel, said hydraulic tensioning device comprising:
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a hydraulic cylinder unit bearingly supported on the trough at one end and by the guide wheel on the other end; a piston unit in said cylinder unit; a cylinder chamber in said cylinder unit for filling with hydraulic fluid; a tappet in said piston unit coupled to said guide wheel; means for pumping hydraulic fluid into said cylinder chamber within said hydraulic cylinder unit including; a tappet piston on the end of the tappet opposite said coupled end defining a secondary cylinder chamber within said piston unit; a spring unit for supporting the tappet against said piston unit; a through line which passes through the tappet piston, the piston unit and the cylinder, and which connects the secondary cylinder chamber with a cylinder unit hydraulic fluid inlet; a tappet check valve positioned in the through line which blocks flow of hydraulic fluid in the direction of the hydraulic reservoir; and two check valves in a base of said piston arranged for connecting the cylinder chamber and the secondary cylinder chamber, which are positioned to block flow of hydraulic fluid in opposite directions. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification