WO2015195000A1 - A power connection device - Google Patents

A power connection device Download PDF

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Publication number
WO2015195000A1
WO2015195000A1 PCT/SE2014/000082 SE2014000082W WO2015195000A1 WO 2015195000 A1 WO2015195000 A1 WO 2015195000A1 SE 2014000082 W SE2014000082 W SE 2014000082W WO 2015195000 A1 WO2015195000 A1 WO 2015195000A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
conductor member
connection device
superstructure
undercarriage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2014/000082
Other languages
French (fr)
Inventor
Bobbie Frank
Joacim HOLMQVIST
Jimmy KÄMÄRÄINEN BERGSTRAND
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Priority to PCT/SE2014/000082 priority Critical patent/WO2015195000A1/en
Priority to US15/319,404 priority patent/US10352023B2/en
Priority to EP14894893.8A priority patent/EP3158136A4/en
Priority to CN201480079931.3A priority patent/CN106536828B/en
Publication of WO2015195000A1 publication Critical patent/WO2015195000A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
    • E02F3/325—Backhoes of the miniature type
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/006—Pivot joint assemblies
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E02F9/123—Drives or control devices specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062—Control of propulsion units
    • E02F9/207—Control of propulsion units of the type electric propulsion units, e.g. electric motors or generators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/04—Commutators
    • H01R39/06—Commutators other than with external cylindrical contact surface, e.g. flat commutators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/64—Devices for uninterrupted current collection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/961—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements with several digging elements or tools mounted on one machine

Definitions

  • a power connection device A power connection device
  • the invention relates to a power connection device for a working machine and a working machine comprising a power connection device.
  • the invention can be applied on different types of working machine having an undercarriage and a superstructure being pivotable relative to each other; in particular the invention can be applied on an excavator.
  • a working machine is usually provided with a bucket, container or other type of implement for digging, lifting, carrying and/or transporting a load.
  • an excavator has a lift arm unit for raising and lowering an implement, such as a bucket.
  • the excavator may have an undercarriage and a superstructure arranged on the undercarriage which superstructure can be pivoted relative the undercarriage.
  • the lift arm is arranged on the superstructure and thereby loading and unloading the bucket can be performed at different positions by pivoting the superstructure.
  • an excavator that is provided with wheels or caterpillar tracks is mobile.
  • an excavator that has to be powered from an external power source during operation such as an electrically driven excavator, where an electric power cable is connected to the excavator by means of a power connection device
  • the movement of the excavator and/or pivoting of the superstructure relative to the undercarriage may be limited and there is also a risk of damaging the electric power cable when operating the excavator.
  • An object of the invention is to provide a power connection device, by which device the operational flexibility of a working machine can be improved. This object is achieved by a power connection device according to claim 1.
  • the invention is based on the insight that by the provision of a power connection device having a first power conductor member which is adapted to be pivotally arranged relative to the undercarriage and the superstructure about the substantially vertical pivot axis, it is possible to rotate the superstructure or the entire working machine while having a power cable extending in one and the same direction from an external power source to the same position of the working machine. This in turn will increase the operational flexibility and secure a safe connection to the power source, and reduce the risk of damaging the power cable during operation of the working machine.
  • external power source is meant a power source arranged outside the working machine at a distance from the working machine, which power source does not move together with the movement of the working machine.
  • the external power source can be a stationary electric power source where there is a need of transmitting electric energy from the power source to the working machine by means of an electric cable and a power connection means so as to power the working machine.
  • the first power conductor member is adapted to have a pivot range of approximately 360°, and preferably a pivot range exceeding 360°, i.e. the conductor member can be freely rotated relative to the undercarriage and the superstructure. This will further increase the operational flexibility.
  • the invention relates to a working machine according to claim 13. All features described herein with respect to the power connection device can be applied to the working machine according to the invention.
  • the invention relates to a system comprising a working machine according to the invention and an external power source for transmitting electric energy to the working machine.
  • Fig. 1 is a side view illustrating an excavator having a power connection device according to the invention
  • Fig. 2 shows in a perspective view one embodiment of the power connection device according to the invention
  • Fig, 3 shows in an exploded view the power connection device illustrated in Fig, 2,
  • Fig. 4 shows details of the power connection device in Figs. 2 and 3
  • Figs. 5a and 5b show an excavator in two different directions, where the excavator is provided with the power connection device according to the invention.
  • Fig, 1 is an illustration of a working machine 1 in the form of an excavator.
  • the excavator is an example of a working machine where a power connection device according to the invention can be applied.
  • the excavator has an undercarriage 2 and a superstructure 3.
  • the undercarriage 2 and the superstructure 3 are pivotable relative to each other about a substantially vertical pivot axis 4.
  • a power connection device 5 is arranged between the undercarriage 2 and the superstructure 3 and there is an electric cable 20 connected between the power connection device 5 and an external power source 21.
  • the power connection device 5 comprises a first power conductor member 6 which is adapted to be pivotally arranged relative to an undercarriage and a superstructure of a working machine.
  • this first power conductor member 6 is designed as an arc-shaped rail intended to be arranged in a space between the undercarriage and the superstructure of the working machine.
  • the first power conductor member 6 is constituted by one or more circular arc shaped conductor rails.
  • the first power conductor member can be design as a swivel or a slip ring.
  • the power connection device 5 can comprise a lower attachment component 7, such as a plate or disc, intended to be attached to a upper surface of the undercarriage and an upper attachment component 8, such as a plate or disc, intended to be attached to a lower surface of the superstructure.
  • the first conductor member 6 is slidingly arranged between the lower and upper attachment components 7, 8 allowing the first power conductor member 6 to pivot relative to the lower and upper attachment components.
  • One or more bearings can be used for allowing the first power conductor member 6 to pivot relative to the undercarriage and the superstructure.
  • the pivot axis 9 of the first power conductor member 6 coincides with the pivot axis 4 (see figure 1) for rotation of the superstructure relative to the undercarriage.
  • the first conductor member 6 is further preferably enclosed by a casing 10 in the form of a ring, for instance.
  • the power connection device 5 can further comprise an arm 11 attached to the casing 10.
  • the first conductor member 6, the casing 10 enclosing the first conductor member 6 and the arm 11 will be pivotable together making it possible to direct the arm in the desired direction independently of how the undercarriage and the superstructure are directed.
  • the first power conductor member 6 can be adapted to have a pivot range of at least 180°, preferably 270°, and more preferably approximately 360° or more.
  • an electric cable 20 is connected to the free end 13 of the arm 11 and the other end of the cable is connected to an external electric power source (illustrated in Fig. 1). Furthermore, electric wires 14 extend inside the arm 11 from the connection point (between the arm and the cable) to the first conductor member 6 for transmitting power from the power source.
  • the power connection device 5 preferably comprises a second power conductor member 15 for transmitting electric power between the first power conductor member 6 and the second power conductor member 15 while allowing a relative pivot motion between the first power conductor member 6 and the second power conductor member 15.
  • the second power conductor member 15 and the first power conductor member 6 can be adapted for sliding contact with each other.
  • the second power conductor member 15 and the first power conductor member 6 are adapted for transmitting power by induction therebetween.
  • the second power conductor member 15 can be a power collector adapted to be fixedly arranged on the undercarriage or the superstructure for transmitting electric power to an electric component arranged on the undercarriage or the super structure power.
  • the second conductor member 15 is arranged on the superstructure by means of the upper attachment component 8.
  • the power is then transmitted from the second conductor means 15 to any electrically driven component of the working machine by means of electric cables or wires.
  • the power can be used for rotation of the superstructure by means of an electric motor and operation of a lift arm, implements etc., arranged on the working machine.
  • first power conductor member in the illustrated example has been described as a conductor rail or rails and the second power conductor member as a power collector component following the rail, in an alternative solution the power collector could be designed as a rail or rails and the first power conductor member could be designed as a component following the rails.
  • Figs. 5a and 5b show in top Views an excavator 1 in operation, where the excavator 1 is provided with the power connection device 5 according to the invention.
  • the electric power cable 20 is pointing at one and the same direction in both figures, whereas the excavator 1 has been rotated in Fig. 5b as compared to Fig. 5a.
  • the excavator 1 can be rotated while maintaining the direction of the electric power cable 20 without any interference from the electric power cable 20.
  • the rotation of the excavator could be 360° while maintaining the direction of the electric power cable 20.
  • the superstructure can also be rotated relative to the undercarriage as indicated by dotted lines in Fig. 5b.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

The invention relates to a power connection device (5) for transmitting electric power from an external power source to a working machine (1). The working machine has an undercarriage (2) and a superstructure (3), and the undercarriage and the superstructure are pivotable relative to each other about a substantially vertical pivot axis (4). The power connection device (5) comprises a first power conductor member (6) which is adapted to be pivotally arranged relative to the undercarriage (2) and the superstructure (3) about the substantially vertical pivot axis (4).

Description

A power connection device
TECHNICAL FIELD
The invention relates to a power connection device for a working machine and a working machine comprising a power connection device.
The invention can be applied on different types of working machine having an undercarriage and a superstructure being pivotable relative to each other; in particular the invention can be applied on an excavator. BACKGROUND OF THE INVENTION
A working machine is usually provided with a bucket, container or other type of implement for digging, lifting, carrying and/or transporting a load. For example, an excavator has a lift arm unit for raising and lowering an implement, such as a bucket. The excavator may have an undercarriage and a superstructure arranged on the undercarriage which superstructure can be pivoted relative the undercarriage. The lift arm is arranged on the superstructure and thereby loading and unloading the bucket can be performed at different positions by pivoting the superstructure. In addition, an excavator that is provided with wheels or caterpillar tracks is mobile.
For such an excavator, that has to be powered from an external power source during operation such as an electrically driven excavator, where an electric power cable is connected to the excavator by means of a power connection device, the movement of the excavator and/or pivoting of the superstructure relative to the undercarriage may be limited and there is also a risk of damaging the electric power cable when operating the excavator.
SUMMARY OF THE INVENTION
An object of the invention is to provide a power connection device, by which device the operational flexibility of a working machine can be improved. This object is achieved by a power connection device according to claim 1.
The invention is based on the insight that by the provision of a power connection device having a first power conductor member which is adapted to be pivotally arranged relative to the undercarriage and the superstructure about the substantially vertical pivot axis, it is possible to rotate the superstructure or the entire working machine while having a power cable extending in one and the same direction from an external power source to the same position of the working machine. This in turn will increase the operational flexibility and secure a safe connection to the power source, and reduce the risk of damaging the power cable during operation of the working machine.
By "external power source" is meant a power source arranged outside the working machine at a distance from the working machine, which power source does not move together with the movement of the working machine. For example, the external power source can be a stationary electric power source where there is a need of transmitting electric energy from the power source to the working machine by means of an electric cable and a power connection means so as to power the working machine.
In one embodiment of the power connection device according to the invention, the first power conductor member is adapted to have a pivot range of approximately 360°, and preferably a pivot range exceeding 360°, i.e. the conductor member can be freely rotated relative to the undercarriage and the superstructure. This will further increase the operational flexibility.
According to a second aspect, the invention relates to a working machine according to claim 13. All features described herein with respect to the power connection device can be applied to the working machine according to the invention.
According to a third aspect, the invention relates to a system comprising a working machine according to the invention and an external power source for transmitting electric energy to the working machine. Effects and advantages of the second and third aspects of the present invention are largely analogous to those described above in relation to the first aspect of the present invention. Further advantages and advantageous features of the invention are disclosed in the following description and in the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS With reference to the appended drawings, below follows a more detailed description of embodiments of the invention cited as examples.
In the drawings: Fig. 1 is a side view illustrating an excavator having a power connection device according to the invention,
Fig. 2 shows in a perspective view one embodiment of the power connection device according to the invention,
Fig, 3 shows in an exploded view the power connection device illustrated in Fig, 2,
Fig. 4 shows details of the power connection device in Figs. 2 and 3, and Figs. 5a and 5b show an excavator in two different directions, where the excavator is provided with the power connection device according to the invention.
DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS OF THE INVENTION Fig, 1 is an illustration of a working machine 1 in the form of an excavator. The excavator is an example of a working machine where a power connection device according to the invention can be applied. The excavator has an undercarriage 2 and a superstructure 3. The undercarriage 2 and the superstructure 3 are pivotable relative to each other about a substantially vertical pivot axis 4. A power connection device 5 is arranged between the undercarriage 2 and the superstructure 3 and there is an electric cable 20 connected between the power connection device 5 and an external power source 21.
One example embodiment of a power connection device 5 according to the invention is illustrated in Figs. 2 and 3. The power connection device 5 comprises a first power conductor member 6 which is adapted to be pivotally arranged relative to an undercarriage and a superstructure of a working machine. In the embodiment illustrated this first power conductor member 6 is designed as an arc-shaped rail intended to be arranged in a space between the undercarriage and the superstructure of the working machine. Preferably, the first power conductor member 6 is constituted by one or more circular arc shaped conductor rails.
As an alternative the first power conductor member can be design as a swivel or a slip ring.
As appears from the exploded view in Fig. 3, the power connection device 5 can comprise a lower attachment component 7, such as a plate or disc, intended to be attached to a upper surface of the undercarriage and an upper attachment component 8, such as a plate or disc, intended to be attached to a lower surface of the superstructure. The first conductor member 6 is slidingly arranged between the lower and upper attachment components 7, 8 allowing the first power conductor member 6 to pivot relative to the lower and upper attachment components. One or more bearings can be used for allowing the first power conductor member 6 to pivot relative to the undercarriage and the superstructure. The pivot axis 9 of the first power conductor member 6 coincides with the pivot axis 4 (see figure 1) for rotation of the superstructure relative to the undercarriage. The first conductor member 6 is further preferably enclosed by a casing 10 in the form of a ring, for instance. The power connection device 5 can further comprise an arm 11 attached to the casing 10. In other words; the first conductor member 6, the casing 10 enclosing the first conductor member 6 and the arm 11 will be pivotable together making it possible to direct the arm in the desired direction independently of how the undercarriage and the superstructure are directed. The first power conductor member 6 can be adapted to have a pivot range of at least 180°, preferably 270°, and more preferably approximately 360° or more. By making the first power conductor member freely rotatable relative to the undercarriage and the superstructure, the operational flexibility can be optimized. For powering the working machine, one end of an electric cable 20 is connected to the free end 13 of the arm 11 and the other end of the cable is connected to an external electric power source (illustrated in Fig. 1). Furthermore, electric wires 14 extend inside the arm 11 from the connection point (between the arm and the cable) to the first conductor member 6 for transmitting power from the power source.
As illustrated in Fig. 4 the power connection device 5 preferably comprises a second power conductor member 15 for transmitting electric power between the first power conductor member 6 and the second power conductor member 15 while allowing a relative pivot motion between the first power conductor member 6 and the second power conductor member 15. For example, the second power conductor member 15 and the first power conductor member 6 can be adapted for sliding contact with each other. Another option is that the second power conductor member 15 and the first power conductor member 6 are adapted for transmitting power by induction therebetween.
The second power conductor member 15 can be a power collector adapted to be fixedly arranged on the undercarriage or the superstructure for transmitting electric power to an electric component arranged on the undercarriage or the super structure power. In the embodiment illustrated in Fig. 4 the second conductor member 15 is arranged on the superstructure by means of the upper attachment component 8. The power is then transmitted from the second conductor means 15 to any electrically driven component of the working machine by means of electric cables or wires. For example, the power can be used for rotation of the superstructure by means of an electric motor and operation of a lift arm, implements etc., arranged on the working machine.
Although the first power conductor member in the illustrated example has been described as a conductor rail or rails and the second power conductor member as a power collector component following the rail, in an alternative solution the power collector could be designed as a rail or rails and the first power conductor member could be designed as a component following the rails.
Figs. 5a and 5b show in top Views an excavator 1 in operation, where the excavator 1 is provided with the power connection device 5 according to the invention. As illustrated the electric power cable 20 is pointing at one and the same direction in both figures, whereas the excavator 1 has been rotated in Fig. 5b as compared to Fig. 5a. Thus, the excavator 1 can be rotated while maintaining the direction of the electric power cable 20 without any interference from the electric power cable 20. The rotation of the excavator could be 360° while maintaining the direction of the electric power cable 20. The superstructure can also be rotated relative to the undercarriage as indicated by dotted lines in Fig. 5b. Although not illustrated, it is of course possible, for a certain direction of the excavator 1 , to instead rotate the arm 11 of the power connection device 5 to the desired position for enabling connection to an electric power cable having any direction due to the position of the power source relative to the excavator. It is to be understood that the present invention is not limited to the embodiments described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the appended claims.

Claims

1. . A power connection device (5) for transmitting electric power from an externa! power source to a working machine (1) having an undercarriage (2) and a superstructure (3), the undercarriage and the superstructure being pivotable relative to each other about a substantially vertical pivot axis (4), characterized in that the power connection device (5) comprises a first power conductor member (6) which is adapted to be pivotally arranged relative to the undercarriage (2) and the superstructure (3) about the substantially vertical pivot axis (4).
2.. A power connection device according to claim 1 , characterized in that the first power conductor member (6) is adapted to be arranged in a space between the undercarriage (2) and the superstructure (3).
3. A power connection device according to claim 1 or 2, characterized in that the power connection device (5) comprises a second power conductor member (15) for transmitting electric power from the first power conductor member (6) to the second power conductor member (15) while allowing a relative pivot motion between the first power conductor member (6) and the second power conductor member (15).
4. A power connection device according to claim 3, characterized in that the second power conductor member (15) and the first power conductor member (6) are adapted for sliding contact with each other.
5. A power connection device according to claim 3, characterized in that the second power conductor member (15) and the first power conductor member (6) are adapted for transmitting power by induction therebetween.
6. A power connection device according to any of claims 3-5, characterized in that the second power conductor member (15) is a power collector adapted to be fixedly arranged on the undercarriage (2) or the superstructure (3) for transmitting electric power to an electric component arranged on the working machine (1).
7. A power connection device according to any preceding claim, characterized in that the first power conductor member (6) is constituted by one or more circular arc shaped conductor rails.
8. A power connection device according to any preceding claim, characterized in that the power connection device (5) comprises at least one bearing for allowing the first power conductor member (6) to pivot relative to the undercarriage (2) and the superstructure (3).
9. A power connection device according to any preceding claim, characterized in that the power connection device (5) comprises a lower attachment component (7) intended to be attached to a upper surface of the undercarriage (2) and an upper attachment component (8) intended to be attached to a lower surface of the superstructure (3), the first conductor member (6) being slidingly arranged between the lower and upper attachment components (7, 8) allowing the first power conductor member (6) to pivot relative to the lower and upper attachment components.
10. A power connection device according to any preceding claim, characterized in that the first power conductor member (6) is adapted to have a pivot range of at least 180°.
11. A power connection device according to any preceding claim, characterized in that the first power conductor member (6) is adapted to have a pivot range of at least 270°.
12. A power connection device according to any preceding claim, characterized in that the first power conductor member (6) is adapted to have a pivot range of approximately 360° or more.
13. A worKing machine (1) comprising an undercarriage (2) and a superstructure (3) which are pivotable relative to each other about a substantially vertical pivot axis (4), and a power connection device (5) for transmitting electric power from an external power source to the working machine (1), characterized in that the power connection device (5) comprises a first power conductor member (6), the first power conductor member (6) being pivotabie relative to the undercarriage (2) and the superstructure (3) about the substantially vertical pivot axis (4).
14. A working machine according to claim 13, characterized in that the first power conductor member (6) is arranged in a space between the undercarriage (2) and the superstructure (3).
15. A working machine according to claim 13 or 14, characterized in that the first power conductor member (6) has a pivot range of at least 180°.
16. A working machine according to any of claims 13-15, characterized in that the first power conductor member (6) has a pivot range of at least 270'.
17. A working machine according to any of claims 13-16, characterized in that the first power conductor member (6) has a pivot range of approximately 360° or more.
PCT/SE2014/000082 2014-06-17 2014-06-17 A power connection device Ceased WO2015195000A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/SE2014/000082 WO2015195000A1 (en) 2014-06-17 2014-06-17 A power connection device
US15/319,404 US10352023B2 (en) 2014-06-17 2014-06-17 Power connection device
EP14894893.8A EP3158136A4 (en) 2014-06-17 2014-06-17 A power connection device
CN201480079931.3A CN106536828B (en) 2014-06-17 2014-06-17 Electrical connection device

Applications Claiming Priority (1)

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PCT/SE2014/000082 WO2015195000A1 (en) 2014-06-17 2014-06-17 A power connection device

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WO (1) WO2015195000A1 (en)

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US20170121937A1 (en) 2017-05-04
US10352023B2 (en) 2019-07-16
CN106536828A (en) 2017-03-22
EP3158136A4 (en) 2018-02-07
EP3158136A1 (en) 2017-04-26
CN106536828B (en) 2020-09-01

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