IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0067204
(2002-02-07)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Finnegan, Henderson, Farabow, Garrett &
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인용정보 |
피인용 횟수 :
16 인용 특허 :
10 |
초록
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A method of operating a track-type machine having a drive wheel and an idler. The method includes operating the drive wheel to advance a drive track around the drive wheel and the idler thereby moving the track-type machine. The method further includes determining a force to be applied to the idler
A method of operating a track-type machine having a drive wheel and an idler. The method includes operating the drive wheel to advance a drive track around the drive wheel and the idler thereby moving the track-type machine. The method further includes determining a force to be applied to the idler based on a direction of operation of the drive wheel and applying the force to the idler. The method may include varying the force applied to the idler as a function of a drawbar load of the machine. The method may include sensing a pressure of fluid being used to operate the drive wheel, wherein the force is determined based on the sensed pressure of fluid being used to operate the drive wheel. The method may include determining a force to be applied to the idler by selecting a recoil curve, sensing a position of the idler, and selecting the force to be applied based on a point on the selected recoil curve that corresponds to the sensed position of the idler on the selected recoil curve. The recoil curve may be selected from a plurality of recoil curves.
대표청구항
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1. A method of operating a track-type machine having a drive wheel and an idler, the method comprising:operating the drive wheel to advance a drive track around the drive wheel and the idler thereby moving the track-type machine; determining a direction of operation of the drive wheel; sensing a pre
1. A method of operating a track-type machine having a drive wheel and an idler, the method comprising:operating the drive wheel to advance a drive track around the drive wheel and the idler thereby moving the track-type machine; determining a direction of operation of the drive wheel; sensing a pressure of fluid being used to operate the drive wheel; determining a force to be applied to the idler based on the determined direction of operation of the drive wheel and, depending on the determined direction of operation, the sensed pressure of fluid being used to operate the drive wheel; applying the force to the idler. 2. The method of claim 1, wherein said determining a force includes selecting a recoil curve from a plurality of recoil curves based on the sensed pressure of fluid being used to operate the drive wheel and selecting the force to be applied based on a point on the selected recoil curve that corresponds to the sensed position of the idler on the selected recoil curve.3. The method of claim 2, wherein the direction of operation is in a direction from the idler toward the drive wheel.4. The method of claim 1, wherein said applying the force includes operating a valve assembly to control fluid pressure within an actuator associated with the idler.5. The method of claim 1, wherein said determining a force includes determining a first force when the drive wheel is operated in a direction from the drive wheel toward the idler and determining a second force differing from the first force when the drive wheel is operated in a direction from the idler toward the drive wheel.6. The method of claim 1, wherein the force applied to the idler is a function of a drawbar load of the machine.7. A work machine, comprising:a source of pressurized fluid; a fluid reservoir; a drive track; an idler; a drive wheel, the drive wheel being operable to advance the drive track around the drive wheel and the idler; an actuator mechanically coupled to the idler, the actuator being operable to increase and decrease a force being applied to the idler; a valve assembly operable to control fluid flow from the source of pressurized fluid to the actuator and from the actuator to the fluid reservoir; a pressure sensor configured to sense the pressure of fluid being directed from the source of pressurized fluid to the drive wheel; and a controller configured to operate the valve assembly to apply a force to the idler based on a direction of operation of the drive wheel and, depending on the determined direction of operation, the sensed pressure of fluid being directed to the drive wheel. 8. A The work machine of claim 7, further including a position sensor configured to sense a position of the idler, andwherein the controller is configured to operate the valve assembly to apply the force to the idler by selecting a recoil curve from a plurality of recoil curves based on the sensed pressure of fluid being directed to the drive wheel and by selecting the force to be applied to the idler based on a point on the selected recoil curve that corresponds to the sensed position of the idler on the selected recoil curve. 9. The work machine of claim 1, wherein the drive wheel is operable to advance the drive track in a first direction that is associated with movement of the work machine in a direction from the drive wheel toward the idler and in a second opposing direction that is associated with movement of the work machine in a direction from the idler toward the drive wheel, andwherein the controller is configured to operate the valve assembly to apply a first force when the drive wheel is operated in the first direction and a second force when the drive wheel is operated in the second direction, the first force differing from the second force. 10. The work machine of claim 7, wherein the force applied to the idler is a function of a drawbar load of the machine.11. A method of operating a track-type machine having a drive wheel at a first end of the track-type machine and an idler at a second end of the track-type machine, the method comprising:operating a drive wheel to advance a drive track around the drive wheel and the idler thereby moving the track-type machine, the drive wheel being operable in a first direction associated with movement of the track-type machine in a direction from the drive wheel toward the idler and in a second direction associated with movement of the track-type machine in a direction from the idler toward the drive wheel; determining a force to be applied to the idler based on a direction of operation of the drive wheel and a sensed position of the idler when the drive wheel is operated in the first direction, and, when the drive wheel is operated in the second direction, based on a direction of operation of the drive wheel, a sensed pressure of fluid being used to operate the drive wheel, and a sensed position of the idler; and applying the force to the idler. 12. A method of operating a track-type machine having a drive wheel and an idler, the method comprising:operating the drive wheel to advance a drive track around the drive wheel and the idler thereby moving the track-type machine; determining a direction of operation of the drive wheel; determining an amount of recoil of the idler; determining, when the drive wheel is operated in a first direction, a force to be applied to the idler based on the determined direction of operation of the drive wheel and the amount of recoil of the idler; and applying the force to the idler. 13. The method of claim 12, further including, when the drive wheel is operated in a second direction opposite the first direction, sensing a pressure of fluid being used to operate the drive wheel,wherein said force to be applied is determined based on the determined direction of operation of the drive wheel, a sensed pressure of fluid being used to operate the drive wheel, and the amount of recoil of the idler. 14. The method of claim 12, wherein said determining the amount of recoil includes sensing a position of the idler.15. The method of claim 12, wherein the force applied to the idler is a function of a drawbar load of the machine.16. The method of claim 12, wherein said applying the force includes operating a valve assembly to control fluid pressure within an actuator associated with the idler.17. A work machine, comprising:a source of pressurized fluid; a fluid reservoir; a drive track; an idler; a drive wheel, the drive wheel being operable to advance the drive track around the drive wheel and the idler; an actuator mechanically coupled to the idler, the actuator being operable to increase and decrease a force being applied to the idler; a valve assembly operable to control fluid flow from the source of pressurized fluid to the actuator and from the actuator to the fluid reservoir; and a controller configured to determine a direction of operation of the drive wheel and an amount of recoil of the idler, and to operate the valve assembly, when the drive wheel is operated in a first direction, to apply a force to the idler based on the determined direction of operation of the drive wheel and the amount of recoil of the idler. 18. The work machine of claim 17 further including a pressure sensor configured to sense the pressure of fluid being directed from the source of pressurized fluid to the drive wheel,wherein, when the drive wheel is operated in a second direction opposite the first direction, said force to be applied is determined based on the determined direction of operation of the drive wheel, a sensed pressure of fluid being used to operate the drive wheel, and the amount of recoil of the idler. 19. The work machine of claim 17, further including a position sensor configured to sense a position of the idler,wherein the controller determines the amount of recoil of the idler based on a sensed position of the idler. 20. The work machine of claim 17, wherein the force applied to the idler is a function of a drawbar load of the machine.
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