Road construction machine, crawler track unit of a road construction machine, as well as method for tensioning a chain of a crawler track unit
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B62D-055/00
B62D-055/065
B62D-055/30
출원번호
US-0725597
(2010-03-17)
등록번호
US-9016810
(2015-04-28)
우선권정보
DE-10 2009 013 708 (2009-03-20)
발명자
/ 주소
Busley, Peter
Frank, Burkhard
Barimani, Cyrus
Hähn, Günter
출원인 / 주소
Wirtgen GmbH
대리인 / 주소
Patterson Intellectual Property Law, PC
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
In a road construction machine, in particular a road milling machine (1), with a machine frame (2), and a chassis (4) with preferably several crawler track units (6), said chassis (4) carrying the machine frame (2), where the crawler track units (6) comprise a chain (12) which continuously revolves
In a road construction machine, in particular a road milling machine (1), with a machine frame (2), and a chassis (4) with preferably several crawler track units (6), said chassis (4) carrying the machine frame (2), where the crawler track units (6) comprise a chain (12) which continuously revolves around at least one guide wheel (8) and at least one drive wheel (10), as well as several track rollers (14) which roll on the chain (12) and carry the machine frame (2), where the drive wheel (10) or preferably the guide wheel (8) is provided with an adjustment device (18), which enables the reciprocal spacing of the axles (20,22) of the drive wheel and guide wheel (8,10) to be adjusted for adaptation to a current lengthening of the chain (12), and where in addition to the adjustment device (18), a spring element (24) is provided which allows, using the adjusted spacing as a basis, a shortening of the spacing between the axles (20,22) of the drive wheel and guide wheel (8,10) against the spring force in the event of an operation-related increase of the chain tension to prevent any tension peaks in the chain (12), it is provided that the adjustment device (18) comprises a piston-cylinder unit (28) with a piston (30) to which a preferably hydraulic operating pressure can be applied in order to generate a predetermined force of the piston (30), and that, upon reaching the predetermined chain tension, a locking device (34) locks the end position of the piston (30) of the piston-cylinder unit (28) reached under the operating pressure applied.
대표청구항▼
1. A road construction machine, with a machine frame, anda chassis with a plurality of crawler track units, said chassis carrying the machine frame, wherethe crawler track units comprise a chain which continuously revolves around at least one guide wheel and at least one drive wheel, as well as a pl
1. A road construction machine, with a machine frame, anda chassis with a plurality of crawler track units, said chassis carrying the machine frame, wherethe crawler track units comprise a chain which continuously revolves around at least one guide wheel and at least one drive wheel, as well as a plurality of track rollers which roll on the chain and carry the machine frame, wherean adjustment device acts on the drive wheel or on the guide wheel, enabling a reciprocal spacing of axles of the drive wheel and guide wheel to be adjusted for adaptation to a lengthening of the chain, and wherein addition to the adjustment device, a spring element is provided which allows, using the adjusted spacing as a basis, a shortening of the spacing between the axles of the drive wheel and guide wheel against the spring force in the event of an operation-related increase of the chain tension to prevent any tension peaks in the chain, wherein the adjustment device comprises a piston-cylinder unit with a piston to which a hydraulic adjusting pressure can be applied in order to generate a predetermined force of the piston, andthe adjustment device is configured such that, upon reaching a predetermined chain tension and prior to engaging the crawler track units to drive the road construction machine, a locking device locks an end position of the piston of the piston-cylinder unit reached under the adjusting pressure applied. 2. A crawler track unit of a road construction machine, with a machine frame and a chassis with a plurality of crawler track units, said chassis carrying the machine frame, where the crawler track units comprise a chain which continuously revolves around at least one guide wheel and at least one drive wheel, as well as a plurality of track rollers which roll on the chain and carry the machine frame, wherean adjustment device acts on the drive wheel or on the guide wheel, enabling a reciprocal spacing of the axles of the drive wheel and guide wheel to be adjusted for adaptation to a lengthening of the chain, and wherein addition to the adjustment device, a spring element is provided which allows, using the adjusted spacing as a basis, a shortening of the spacing between the axles of the drive wheel and guide wheel against the spring force in the event of an operation-related increase of the chain tension to prevent any tension peaks in the chain, wherein the adjustment device comprises a piston-cylinder unit with a piston to which a hydraulic adjusting pressure can be applied in order to generate a predetermined force of the piston, andthe adjustment device is configured such that, upon reaching a predetermined chain tension and prior to engaging the crawler track units to drive the road construction machine, a locking device locks an end position of the piston of the piston-cylinder unit reached under the adjusting pressure applied. 3. The machine in accordance with claim 1, wherein the locking device locks the end position of the piston of the piston-cylinder unit reached under the adjusting pressure applied upon reaching a counterforce between the axles of the drive wheel and guide wheel which equals the force of the piston, or after a predetermined lapse of time of action of the adjustment device, or after reaching a predetermined slack in the upper strand of the chain. 4. The machine in accordance with claim 1, wherein the spring element is arranged in series between the piston of the piston-cylinder unit and the axle of the drive wheel or guide wheel in a prestressed fashion. 5. The machine in accordance with claim 1, wherein the same amount of adjusting pressure is applied to the adjustment devices of all crawler track units. 6. The machine in accordance with claim 1, wherein the piston-cylinder units of the adjustment devices of all crawler track units are interconnected. 7. The machine in accordance with claim 6, wherein the piston-cylinder units of the adjustment devices of all crawler track units, are connected in parallel and are connected to a common pressure accumulator. 8. The machine in accordance with claim 1, wherein a central pressure-limiting valve provides the adjusting pressure for the piston-cylinder unit of the adjustment devices of all crawler track units for adjustment of the chain tension. 9. A method for tensioning a chain of a crawler track unit of a road construction machine with a plurality of crawler track units, where said chain continuously revolves around at least one guide wheel and at least one drive wheel, the method including adjustment of a spacing between axles of the drive wheel and guide wheel for adaptation to a length of the chain, anddynamic limitation of operation-related tension peaks of the chain by a spring element acting between the axles of the drive wheel and guide wheel, wherein the adjustment includes: adjusting the axle spacing between the axles of the drive wheel and guide wheel, prior to engaging the crawler track units to drive the road construction machine, by applying a hydraulic adjusting pressure to a piston-cylinder unit to generate a predetermined force of the piston of the piston-cylinder unit, which increases the axle spacing, andlocking a position of the piston of the piston-cylinder unit upon reaching a predetermined chain tension and prior to engaging the crawler track units to drive the road construction machine. 10. The method in accordance with claim 9, wherein the locking step further includes locking the position of the piston of the piston-cylinder unit upon reaching a counterforce between the axles of the drive wheel and guide wheel which results from a predetermined chain tension and which equals the force of the piston, or after action by the piston force of the piston over a predetermined time lapse, or upon reaching a predetermined slack in the upper strand of the chain. 11. The method in accordance with claim 9, wherein the same amount of adjusting pressure is applied to the piston-cylinder units of all crawler track units. 12. The method in accordance with claim 9, wherein the piston-cylinder units are interconnected for the purpose of adjusting the same amount of chain tension in all crawler track units. 13. The method in accordance with claim 12, wherein the piston-cylinder units, are connected in parallel and are connected to a common pressure accumulator for the purpose of maintaining a same amount of adjusting pressure. 14. The method in accordance with claim 9, wherein the piston-cylinder units of all crawler track units are supplied, prior to locking the end position of the piston, with the adjusting pressure by a central pressure-limiting valve. 15. A road construction machine, comprising: a machine frame;a plurality of crawler track units supporting the machine frame, each crawler track unit including: a guide wheel having a guide wheel axis;a drive wheel having a drive wheel axis;a continuous chain extending around the guide wheel and the drive wheel;a plurality of track rollers which roll on the chain;an adjustment device including a piston-cylinder unit, the piston-cylinder unit including a piston to which a hydraulic adjusting pressure can be applied to generate a piston force acting on at least one of the guide wheel and the drive wheel to adjust an axis spacing between the guide wheel axis and the drive wheel axis; anda spring acting on at least one of the guide wheel and the drive wheel, the spring allowing a shortening of the axis spacing in the event of an operation-related increase of chain tension to reduce any tension peaks in the chain;a hydraulic pressure source;a hydraulic supply line communicating the hydraulic pressure source to at least one of the piston-cylinder units; anda two-way locking valve disposed in the hydraulic supply line between the hydraulic pressure source and the at least one of the piston-cylinder units, the locking valve having an open position allowing hydraulic adjusting pressure to be applied to the at least one of the piston-cylinder units and allowing flow of hydraulic fluid in both directions through the locking valve, and a closed position blocking flow of hydraulic fluid in both directions through the locking valve and locking the piston of the at least one piston-cylinder unit in position relative to the cylinder under the applied hydraulic adjusting pressure. 16. The road construction machine of claim 15, further comprising: a sensor operatively associated with the piston of the at least one piston-cylinder unit to detect when the piston comes to a standstill relative to the cylinder after application of hydraulic adjusting pressure to the piston; anda controller operatively associated with the locking valve and the sensor, the controller operable to move the locking valve to its closed position after detection that the piston is at standstill. 17. The road construction machine of claim 15, further comprising: a controller operably associated with the locking valve, the controller operable to move the locking valve to its closed position after a predetermined lapse of time after the application of hydraulic adjusting pressure to the piston of the at least one piston cylinder unit. 18. The road construction machine of claim 15, further comprising: a distance sensor operatively associated with the chain for detecting slack in an upper strand of the chain; anda controller operatively associated with the locking valve and the sensor, the controller operable to move the locking valve to its closed position after detection of a predetermined slack in the upper strand of the chain. 19. The road construction machine of claim 15, wherein: the spring is prestressed and is arranged in series between the piston of the piston-cylinder unit and either the guide wheel axis or the drive wheel axis. 20. The road construction machine of claim 15, wherein: the hydraulic supply line is communicated with the piston-cylinder units of all of the crawler track units so that an equal hydraulic adjusting pressure is applied to all of the piston-cylinder units. 21. The road construction machine of claim 15, further comprising: a pressure accumulator communicated with at least one of the piston-cylinder units. 22. The road construction machine of claim 21, wherein: the piston-cylinder units of all of the crawler track units are hydraulically connected together in parallel; andthe pressure accumulator is a common pressure accumulator communicated with all of the piston-cylinder units. 23. The road construction machine of claim 15, further comprising: a central pressure-limiting valve communicated with the piston-cylinder units of all of the crawler track units.
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이 특허에 인용된 특허 (10)
Thomas E. Oertley, Apparatus and method for adjusting tension of a drive track chain of a work machine which utilizes a sensor for sensing position of an undercarriage component.
Miller Clifford E., Track tensioning assembly for adjusting tension on a drive track chain of a work machine having a slack adjuster device associated therewith.
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