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Patent · US9989042B2 · B2 · US

Propel circuit and work circuit combinations for a work machine

(11) Publication number
US9989042B2
(21) Application number
13/737,679
(22) Filing date
2013-01-09
(30) Priority date
2012-01-09
(43) Publication date
2018-06-05
(45) Date of grant
2018-06-05
(51) IPC
B60K 6/12; B66F 9/075; E02F 9/22; F04B 17/05; F04B 49/00; F15B 1/02; F15B 21/14; F16H 61/4078; F16H 61/4096
(52) CPC
  • F04B Positive-displacement machines for liquids; pumps: 17/05, 49/00
  • B60K Arrangement or mounting of propulsion units or of transmissions in vehicles; arrangement or mounting of plural diverse prime-movers in vehicles; auxiliary drives for vehicles; instrumentation or dashboards for vehicles; arrangements in connection with cooling, air intake, gas exhaust or fuel supply of propulsion units in vehicles: 6/12
  • B66F Hoisting, lifting, hauling or pushing, not otherwise provided for, e.g. devices which apply a lifting or pushing force directly to the surface of a load: 9/07572
  • E02F Dredging; soil-shifting: 9/2217, 9/2246, 9/2253, 9/2282, 9/2289, 9/2292, 9/2296
  • F15B Systems acting by means of fluids in general; fluid-pressure actuators, e.g. servomotors; details of fluid-pressure systems, not otherwise provided for: 1/02, 21/14, 2211/20523, 2211/20546, 2211/20561, 2211/20569, 2211/212, 2211/6309, 2211/6313, 2211/633, 2211/6333, 2211/6336, 2211/6343, 2211/6346, 2211/7135, 2211/88
  • F16H Gearing: 61/4078, 61/4096
  • Y02T Climate change mitigation technologies related to transportation: 10/62, 10/6208
(73) Assignee
Eaton Intelligent Power Ltd
(72) Inventors
Benjamin Maxfield Hoxie; Timothy Isaac Meehan
(54) Title
Propel circuit and work circuit combinations for a work machine
(57) Abstract

A hydraulic circuit architecture for a work vehicle includes a pump, a work circuit, a propel circuit, and a circuit selector. The work circuit is connected to an actuator for driving a work component of the work vehicle. The propel circuit includes a motor that is adapted to be connected to a drive train of the work vehicle. The propel circuit also includes an accumulator. The circuit selector selectively connects the pump to the work circuit and the propel circuit. The hydraulic circuit architecture is operable in a first mode and a second mode. In the first mode, the propel circuit is connected to the pump and the work circuit is disconnected from the pump. In the second mode, the work circuit is connected to the pump and the propel circuit is disconnected from the pump. When the hydraulic circuit architecture is in the second mode, stored energy from the accumulator can be used to drive the motor to cause propulsion of the work vehicle.

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Claims (26)

  1. A hydraulic circuit architecture for a mobile work vehicle, the hydraulic circuit architecture comprising: a drive hydraulic pump adapted to be driven by a prime mover, the drive hydraulic pump having a high pressure side and a low pressure side; a hydraulic work circuit adapted for connection to at least one actuator for driving a work implement of the mobile work vehicle; a hydraulic propel circuit including a propel hydraulic motor adapted to be connected to a drive train of the mobile work vehicle, the hydraulic propel circuit also including a hydraulic accumulator; and a circuit selector for selectively connecting the high pressure side of the drive hydraulic pump to the hydraulic work circuit and the hydraulic propel circuit; wherein the hydraulic circuit architecture is operable in: a) a first mode where the hydraulic propel circuit is connected to the high pressure side of the drive hydraulic pump and the hydraulic work circuit is disconnected from the high pressure side of the drive hydraulic pump; and b) a second mode where the hydraulic work circuit is connected to the high pressure side of the drive hydraulic pump and the hydraulic propel circuit is disconnected from the high pressure side of the drive hydraulic pump so that when the hydraulic circuit architecture is in the second mode, stored energy from the hydraulic accumulator can be used to drive the propel hydraulic motor to cause propulsion of the mobile work vehicle.
  2. The hydraulic circuit architecture of claim 1, further comprising a cross-over hydraulic flow line that provides fluid communication between the hydraulic work circuit and the hydraulic propel circuit, wherein a cross-over valve is provided for opening and closing the cross-over hydraulic flow line.
  3. The hydraulic circuit architecture of claim 2, wherein the cross-over valve controls a flow rate through the cross-over hydraulic flow line.
  4. The hydraulic circuit architecture of claim 2, wherein the cross-over hydraulic flow line allows the stored energy from the hydraulic accumulator to be used to drive the at least one actuator of the hydraulic work circuit.
  5. The hydraulic circuit architecture of claim 2, wherein the hydraulic circuit architecture is operable in a third mode where both the hydraulic work circuit and the hydraulic propel circuit receive no hydraulic fluid flow from the high pressure side of the drive hydraulic pump, and wherein the cross-over hydraulic flow line allows the stored energy from the hydraulic accumulator to be used to drive the at least one actuator of the hydraulic work circuit and the stored energy from the hydraulic accumulator drives the propel hydraulic motor.
  6. The hydraulic circuit architecture of claim 1, wherein the propel hydraulic motor is a variable displacement hydraulic pump/motor, wherein the hydraulic circuit architecture is operable in a charge mode where hydraulic fluid pumped by the variable displacement hydraulic pump/motor is used to charge the hydraulic accumulator.
  7. The hydraulic circuit architecture of claim 6, wherein kinetic energy of the mobile work vehicle is transformed into added stored energy that is stored in the hydraulic accumulator when the mobile work vehicle decelerates.
  8. The hydraulic circuit architecture of claim 1, wherein the drive hydraulic pump is a hydraulic pump/motor, and wherein hydraulic fluid from the hydraulic accumulator can be used to drive the hydraulic pump/motor.
  9. The hydraulic circuit architecture of claim 8, wherein the hydraulic pump/motor may start the prime mover when the hydraulic pump/motor is driven by the hydraulic fluid from the hydraulic accumulator.
  10. The hydraulic circuit architecture of claim 1, wherein the circuit selector includes a valve.
  11. The hydraulic circuit architecture of claim 1, wherein the circuit selector includes a plurality of valves.
  12. The hydraulic circuit architecture of claim 1, further comprising an isolator valve for selectively isolating the hydraulic accumulator from the hydraulic propel circuit.
  13. The hydraulic circuit architecture of claim 12, wherein a maximum working pressure of the hydraulic propel circuit is higher than a working pressure of the hydraulic accumulator.
  14. The hydraulic circuit architecture of claim 12, wherein a maximum working pressure of the hydraulic propel circuit is higher than a rated pressure of the hydraulic accumulator.
  15. The hydraulic circuit architecture of claim 1, further comprising a hydraulic steering circuit in fluid communication with the hydraulic propel circuit.
  16. The hydraulic circuit architecture of claim 1, wherein the mobile work vehicle is a fork lift, wherein the prime mover is a combustion engine mechanically coupled to the drive hydraulic pump, wherein the hydraulic work circuit is hydraulically coupled to the at least one actuator, and wherein the at least one actuator includes a first hydraulic cylinder for lifting a fork of the fork lift, a second hydraulic cylinder for tilting the fork, and a third hydraulic cylinder for laterally moving the fork.
  17. The hydraulic circuit architecture of claim 16, wherein the first hydraulic cylinder is a main stage cylinder, wherein the at least one actuator further includes a secondary stage set of hydraulic cylinders that includes at least one second stage cylinder for lifting the fork of the fork lift.
  18. The hydraulic circuit architecture of claim 1, wherein the drive hydraulic pump is an only drive hydraulic pump of the hydraulic circuit architecture.
  19. The hydraulic circuit architecture of claim 18, wherein the drive hydraulic pump includes a charge pump.
  20. The hydraulic circuit architecture of claim 1, wherein the drive hydraulic pump is a single hydraulic pump of the hydraulic circuit architecture that is adapted to power at least the hydraulic work circuit and the hydraulic propel circuit.
  21. The hydraulic circuit architecture of claim 20, wherein the single hydraulic pump includes a charge pump.
  22. A hydraulic circuit architecture for a mobile work vehicle having a hydraulic pump coupled to a prime mover, the hydraulic circuit architecture comprising: a hydraulic work circuit adapted for connection to at least one actuator for driving a work implement of the mobile work vehicle; a hydraulic propel circuit including a propel hydraulic motor adapted to be connected to a drive train of the mobile work vehicle, the hydraulic propel circuit also including a hydraulic accumulator; a high pressure line leading from a high pressure side of the hydraulic pump to the hydraulic propel circuit and a cross-over hydraulic flow line that selectively provides fluid communication between the hydraulic work circuit and the high pressure line downstream of the accumulator, the cross-over hydraulic flow line being adapted to transfer energy from the hydraulic accumulator to the hydraulic work circuit when the hydraulic circuit architecture is operated in a first mode; wherein the hydraulic circuit architecture also is operable in at least a second mode where the hydraulic work circuit is hydraulically isolated from the hydraulic propel circuit, where the prime mover powers the hydraulic work circuit via the hydraulic pump, and where the hydraulic accumulator powers the propel hydraulic motor.
  23. The hydraulic circuit architecture of claim 22, wherein the hydraulic pump is a single hydraulic pump adapted to be driven by the prime mover.
  24. The hydraulic circuit architecture of claim 23, wherein the single hydraulic pump includes a charge pump.
  25. The hydraulic circuit architecture of claim 22, wherein a cross-over valve is provided for opening and closing the cross-over hydraulic flow line.
  26. The hydraulic circuit architecture of claim 25, wherein the switching from the second mode to the first mode includes opening the cross-over hydraulic flow line.

Description

Work machines can be used to move material, such as pallets, dirt, and/or debris. Examples of work machines include fork lifts, wheel loaders, track loaders, excavators, backhoes, bull dozers, telehandlers, etc. The work machines typically include a work implement (e.g., a fork) connected to the work machine. The work implements attached to the work machines are typically powered by a hydraulic system. The hydraulic system can include a hydraulic pump that is powered by a prime mover, such as a diesel engine. The hydraulic pump can be connected to hydraulic actuators by a set of valves to control flow of pressurized hydraulic fluid to the hydraulic actuators. The pressurized hydraulic fluid causes the hydraulic actuators to extend, retract, or rotate and thereby cause the work implement to move.

The work machine may further include a propulsion system adapted to propel the work machine. The propulsion system may include a hydraulic pump that is powered by the prime mover. The propulsion system may include a hydrostatic drive.

One aspect of the present disclosure relates to a hydraulic circuit architecture for a mobile work vehicle. The hydraulic circuit architecture includes a drive hydraulic pump, a hydraulic work circuit, a hydraulic propel circuit, and a circuit selector. The hydraulic circuit architecture may be adapted to include a single pump as the drive hydraulic pump and thereby provide benefits of avoiding the costs of buying and maintaining multiple pumps as well as benefits of space and weight savings for the hydraulic work machine.

Citations (83)

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Record as JSON 
{
  "publication_number": "US9989042B2",
  "country": "US",
  "kind": "B2",
  "title": "Propel circuit and work circuit combinations for a work machine",
  "abstract": "A hydraulic circuit architecture for a work vehicle includes a pump, a work circuit, a propel circuit, and a circuit selector. The work circuit is connected to an actuator for driving a work component of the work vehicle. The propel circuit includes a motor that is adapted to be connected to a drive train of the work vehicle. The propel circuit also includes an accumulator. The circuit selector selectively connects the pump to the work circuit and the propel circuit. The hydraulic circuit architecture is operable in a first mode and a second mode. In the first mode, the propel circuit is connected to the pump and the work circuit is disconnected from the pump. In the second mode, the work circuit is connected to the pump and the propel circuit is disconnected from the pump. When the hydraulic circuit architecture is in the second mode, stored energy from the accumulator can be used to drive the motor to cause propulsion of the work vehicle.",
  "claims": [
    "1. A hydraulic circuit architecture for a mobile work vehicle, the hydraulic circuit architecture comprising: a drive hydraulic pump adapted to be driven by a prime mover, the drive hydraulic pump having a high pressure side and a low pressure side; a hydraulic work circuit adapted for connection to at least one actuator for driving a work implement of the mobile work vehicle; a hydraulic propel circuit including a propel hydraulic motor adapted to be connected to a drive train of the mobile work vehicle, the hydraulic propel circuit also including a hydraulic accumulator; and a circuit selector for selectively connecting the high pressure side of the drive hydraulic pump to the hydraulic work circuit and the hydraulic propel circuit; wherein the hydraulic circuit architecture is operable in: a) a first mode where the hydraulic propel circuit is connected to the high pressure side of the drive hydraulic pump and the hydraulic work circuit is disconnected from the high pressure side of the drive hydraulic pump; and b) a second mode where the hydraulic work circuit is connected to the high pressure side of the drive hydraulic pump and the hydraulic propel circuit is disconnected from the high pressure side of the drive hydraulic pump so that when the hydraulic circuit architecture is in the second mode, stored energy from the hydraulic accumulator can be used to drive the propel hydraulic motor to cause propulsion of the mobile work vehicle.",
    "2. The hydraulic circuit architecture of claim 1, further comprising a cross-over hydraulic flow line that provides fluid communication between the hydraulic work circuit and the hydraulic propel circuit, wherein a cross-over valve is provided for opening and closing the cross-over hydraulic flow line.",
    "3. The hydraulic circuit architecture of claim 2, wherein the cross-over valve controls a flow rate through the cross-over hydraulic flow line.",
    "4. The hydraulic circuit architecture of claim 2, wherein the cross-over hydraulic flow line allows the stored energy from the hydraulic accumulator to be used to drive the at least one actuator of the hydraulic work circuit.",
    "5. The hydraulic circuit architecture of claim 2, wherein the hydraulic circuit architecture is operable in a third mode where both the hydraulic work circuit and the hydraulic propel circuit receive no hydraulic fluid flow from the high pressure side of the drive hydraulic pump, and wherein the cross-over hydraulic flow line allows the stored energy from the hydraulic accumulator to be used to drive the at least one actuator of the hydraulic work circuit and the stored energy from the hydraulic accumulator drives the propel hydraulic motor.",
    "6. The hydraulic circuit architecture of claim 1, wherein the propel hydraulic motor is a variable displacement hydraulic pump/motor, wherein the hydraulic circuit architecture is operable in a charge mode where hydraulic fluid pumped by the variable displacement hydraulic pump/motor is used to charge the hydraulic accumulator.",
    "7. The hydraulic circuit architecture of claim 6, wherein kinetic energy of the mobile work vehicle is transformed into added stored energy that is stored in the hydraulic accumulator when the mobile work vehicle decelerates.",
    "8. The hydraulic circuit architecture of claim 1, wherein the drive hydraulic pump is a hydraulic pump/motor, and wherein hydraulic fluid from the hydraulic accumulator can be used to drive the hydraulic pump/motor.",
    "9. The hydraulic circuit architecture of claim 8, wherein the hydraulic pump/motor may start the prime mover when the hydraulic pump/motor is driven by the hydraulic fluid from the hydraulic accumulator.",
    "10. The hydraulic circuit architecture of claim 1, wherein the circuit selector includes a valve.",
    "11. The hydraulic circuit architecture of claim 1, wherein the circuit selector includes a plurality of valves.",
    "12. The hydraulic circuit architecture of claim 1, further comprising an isolator valve for selectively isolating the hydraulic accumulator from the hydraulic propel circuit.",
    "13. The hydraulic circuit architecture of claim 12, wherein a maximum working pressure of the hydraulic propel circuit is higher than a working pressure of the hydraulic accumulator.",
    "14. The hydraulic circuit architecture of claim 12, wherein a maximum working pressure of the hydraulic propel circuit is higher than a rated pressure of the hydraulic accumulator.",
    "15. The hydraulic circuit architecture of claim 1, further comprising a hydraulic steering circuit in fluid communication with the hydraulic propel circuit.",
    "16. The hydraulic circuit architecture of claim 1, wherein the mobile work vehicle is a fork lift, wherein the prime mover is a combustion engine mechanically coupled to the drive hydraulic pump, wherein the hydraulic work circuit is hydraulically coupled to the at least one actuator, and wherein the at least one actuator includes a first hydraulic cylinder for lifting a fork of the fork lift, a second hydraulic cylinder for tilting the fork, and a third hydraulic cylinder for laterally moving the fork.",
    "17. The hydraulic circuit architecture of claim 16, wherein the first hydraulic cylinder is a main stage cylinder, wherein the at least one actuator further includes a secondary stage set of hydraulic cylinders that includes at least one second stage cylinder for lifting the fork of the fork lift.",
    "18. The hydraulic circuit architecture of claim 1, wherein the drive hydraulic pump is an only drive hydraulic pump of the hydraulic circuit architecture.",
    "19. The hydraulic circuit architecture of claim 18, wherein the drive hydraulic pump includes a charge pump.",
    "20. The hydraulic circuit architecture of claim 1, wherein the drive hydraulic pump is a single hydraulic pump of the hydraulic circuit architecture that is adapted to power at least the hydraulic work circuit and the hydraulic propel circuit.",
    "21. The hydraulic circuit architecture of claim 20, wherein the single hydraulic pump includes a charge pump.",
    "22. A hydraulic circuit architecture for a mobile work vehicle having a hydraulic pump coupled to a prime mover, the hydraulic circuit architecture comprising: a hydraulic work circuit adapted for connection to at least one actuator for driving a work implement of the mobile work vehicle; a hydraulic propel circuit including a propel hydraulic motor adapted to be connected to a drive train of the mobile work vehicle, the hydraulic propel circuit also including a hydraulic accumulator; a high pressure line leading from a high pressure side of the hydraulic pump to the hydraulic propel circuit and a cross-over hydraulic flow line that selectively provides fluid communication between the hydraulic work circuit and the high pressure line downstream of the accumulator, the cross-over hydraulic flow line being adapted to transfer energy from the hydraulic accumulator to the hydraulic work circuit when the hydraulic circuit architecture is operated in a first mode; wherein the hydraulic circuit architecture also is operable in at least a second mode where the hydraulic work circuit is hydraulically isolated from the hydraulic propel circuit, where the prime mover powers the hydraulic work circuit via the hydraulic pump, and where the hydraulic accumulator powers the propel hydraulic motor.",
    "23. The hydraulic circuit architecture of claim 22, wherein the hydraulic pump is a single hydraulic pump adapted to be driven by the prime mover.",
    "24. The hydraulic circuit architecture of claim 23, wherein the single hydraulic pump includes a charge pump.",
    "25. The hydraulic circuit architecture of claim 22, wherein a cross-over valve is provided for opening and closing the cross-over hydraulic flow line.",
    "26. The hydraulic circuit architecture of claim 25, wherein the switching from the second mode to the first mode includes opening the cross-over hydraulic flow line."
  ],
  "description_excerpt": "Work machines can be used to move material, such as pallets, dirt, and/or debris. Examples of work machines include fork lifts, wheel loaders, track loaders, excavators, backhoes, bull dozers, telehandlers, etc. The work machines typically include a work implement (e.g., a fork) connected to the work machine. The work implements attached to the work machines are typically powered by a hydraulic system. The hydraulic system can include a hydraulic pump that is powered by a prime mover, such as a diesel engine. The hydraulic pump can be connected to hydraulic actuators by a set of valves to control flow of pressurized hydraulic fluid to the hydraulic actuators. The pressurized hydraulic fluid causes the hydraulic actuators to extend, retract, or rotate and thereby cause the work implement to move.\n\nThe work machine may further include a propulsion system adapted to propel the work machine. The propulsion system may include a hydraulic pump that is powered by the prime mover. The propulsion system may include a hydrostatic drive.\n\nOne aspect of the present disclosure relates to a hydraulic circuit architecture for a mobile work vehicle. The hydraulic circuit architecture includes a drive hydraulic pump, a hydraulic work circuit, a hydraulic propel circuit, and a circuit selector. The hydraulic circuit architecture may be adapted to include a single pump as the drive hydraulic pump and thereby provide benefits of avoiding the costs of buying and maintaining multiple pumps as well as benefits of space and weight savings for the hydraulic work machine.",
  "cpc": [
    "F04B 17/05",
    "B60K 6/12",
    "B66F 9/07572",
    "E02F 9/2217",
    "E02F 9/2246",
    "E02F 9/2253",
    "E02F 9/2282",
    "E02F 9/2289",
    "E02F 9/2292",
    "E02F 9/2296",
    "F04B 49/00",
    "F15B 1/02",
    "F15B 21/14",
    "F15B 2211/20523",
    "F15B 2211/20546",
    "F15B 2211/20561",
    "F15B 2211/20569",
    "F15B 2211/212",
    "F15B 2211/6309",
    "F15B 2211/6313",
    "F15B 2211/633",
    "F15B 2211/6333",
    "F15B 2211/6336",
    "F15B 2211/6343",
    "F15B 2211/6346",
    "F15B 2211/7135",
    "F15B 2211/88",
    "F16H 61/4078",
    "F16H 61/4096",
    "Y02T 10/62",
    "Y02T 10/6208"
  ],
  "ipc": [
    "B60K 6/12",
    "B66F 9/075",
    "E02F 9/22",
    "F04B 17/05",
    "F04B 49/00",
    "F15B 1/02",
    "F15B 21/14",
    "F16H 61/4078",
    "F16H 61/4096"
  ],
  "assignees": [
    "Eaton Intelligent Power Ltd"
  ],
  "inventors": [
    "Benjamin Maxfield Hoxie",
    "Timothy Isaac Meehan"
  ],
  "filing_date": "2013-01-09",
  "publication_date": "2018-06-05",
  "grant_date": "2018-06-05",
  "priority_date": "2012-01-09",
  "application_number": "US-201313737679-A",
  "family_id": "47605766",
  "cited_by_count": 6,
  "citations": [
    "US3238722A",
    "US4369625A",
    "EP0140046B1",
    "US4778020A",
    "US5495912A",
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    "DE10128582A1",
    "US20050042121A1",
    "DE10151831A1",
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}

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