WO2024257926A1 - Petite excavatrice électrique - Google Patents

Petite excavatrice électrique Download PDF

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Publication number
WO2024257926A1
WO2024257926A1 PCT/KR2023/008381 KR2023008381W WO2024257926A1 WO 2024257926 A1 WO2024257926 A1 WO 2024257926A1 KR 2023008381 W KR2023008381 W KR 2023008381W WO 2024257926 A1 WO2024257926 A1 WO 2024257926A1
Authority
WO
WIPO (PCT)
Prior art keywords
body frame
inlet
electric excavator
radiator
oil cooler
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.)
Pending
Application number
PCT/KR2023/008381
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English (en)
Korean (ko)
Inventor
최민수
홍경철
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/KR2023/008381 priority Critical patent/WO2024257926A1/fr
Publication of WO2024257926A1 publication Critical patent/WO2024257926A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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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
    • 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

Definitions

  • the present disclosure relates generally to small electric excavators.
  • the present disclosure relates to small electric excavators having a structure and arrangement capable of improving cooling efficiency of internal components.
  • the present disclosure may be applied to large vehicles such as trucks, buses, and construction equipment among other vehicle types.
  • trucks, buses, and construction equipment among other vehicle types.
  • the present disclosure may be described with respect to a particular vehicle, the present disclosure is not limited to any particular vehicle.
  • An excavator is a type of construction machine that performs various tasks, such as digging the ground at construction sites, loading work to transport soil, excavating work to create a foundation, crushing work to dismantle a building, leveling work to prepare the ground, and leveling work to level the ground.
  • Such construction machines may generally include a lower body that functions to move the equipment, an upper swivel body that is swivellably mounted on the lower body, and a work device mounted on the front of the upper swivel body.
  • Conventional excavators are usually equipped with an engine such as a diesel engine to obtain driving power, and the power of this engine is used to drive a hydraulic pump, and the hydraulic fluid discharged from the hydraulic pump is supplied to a hydraulic actuator such as a hydraulic motor or a hydraulic cylinder, thereby rotating the driving crawler or tires or operating equipment such as a boom, arm, or bucket.
  • an engine such as a diesel engine to obtain driving power
  • the power of this engine is used to drive a hydraulic pump
  • the hydraulic fluid discharged from the hydraulic pump is supplied to a hydraulic actuator such as a hydraulic motor or a hydraulic cylinder, thereby rotating the driving crawler or tires or operating equipment such as a boom, arm, or bucket.
  • the present disclosure is intended to solve the problems of the above-mentioned prior art, and an object of the present disclosure is to provide a small electric excavator having a structure and arrangement capable of improving the cooling efficiency of internal components.
  • the first aspect of the present disclosure provides a compact electric excavator including a lower body, an upper slewing body, and a work device
  • the upper slewing body includes a body frame, a cabin installed on the left side of the body frame, and a counterweight installed on the rear of the body frame, and inside the body frame
  • an MCV and a hydraulic tank are arranged on the left side with respect to a centerline
  • a cooling fan, a radiator, an oil cooler, a battery, an electric motor, a hydraulic pump, and electric devices are arranged on the right side, and at least one inlet for introducing cool air is formed in the body frame, an outlet for discharging heated air is formed on the front side of the body frame, and the cooling fan is arranged immediately behind the outlet and configured to blow internal air of the body frame forward.
  • the radiator and the oil cooler may be positioned directly behind the cooling fan, which may be a compact electric excavator.
  • the MCV may be a small electric excavator characterized in that it is arranged on the left front side with respect to the centerline inside the body frame, and ventilation is formed on the lower part of the body frame where the MCV is located so that heat generated from the MCV can be circulated.
  • the battery may be disposed behind the radiator and the oil cooler, and a second inlet is formed on the right side of the body frame to introduce air for cooling the battery, which may be a small electric excavator.
  • the first inlet may be a small electric excavator, characterized in that it includes a long hole extending horizontally, and an inclined hole extending downwardly from one end of the long hole.
  • the fourth inlet may be formed in an inclined shape with an open rearward direction on the upper surface of the body frame, which may be a small electric excavator.
  • a blocking wall is installed inside the body frame to at least partially block the inflow of air from the left to the right with respect to the center line, thereby blocking the air heated while passing through the MCV located at the left front inside the body frame from moving to the radiator and oil cooler located at the right front, thereby preventing the cooling efficiency of the radiator and oil cooler from being reduced.
  • FIG. 1 is a drawing showing the basic configuration of a small electric excavator according to one aspect of the present disclosure.
  • FIG. 2 is a front perspective view of the upper swivel body according to one aspect of the present disclosure.
  • Figure 3 is a rear perspective view of the upper swivel body according to one side of the present disclosure.
  • Figure 4 is a plan view of the upper swivel body according to one side of the present disclosure.
  • FIG. 5 is a drawing partially showing the internal space of the upper swivel body according to one aspect of the present disclosure.
  • FIG. 6 is a cross-sectional view taken along line A-A' of FIG. 2, schematically illustrating air flow inside a body frame according to one side of the present disclosure.
  • FIG. 7 is a cross-sectional view taken along line B-B' of FIG. 3, schematically illustrating air flow inside a body frame according to one side of the present disclosure.
  • Figure 8 is a rear perspective view of the upper swivel body according to another aspect of the present disclosure.
  • first, second, etc. may be used herein to describe various elements, it will be understood that these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present disclosure, a first element could be referred to as a second element, and similarly, a second element could also be referred to as a first element.
  • FIG. 1 is a drawing showing the basic configuration of a small electric excavator according to one aspect of the present disclosure
  • FIG. 2 is a front perspective view of an upper slewing body according to one aspect of the present disclosure
  • FIG. 3 is a rear perspective view of an upper slewing body according to one aspect of the present disclosure
  • FIG. 4 is a plan view of an upper slewing body according to one aspect of the present disclosure
  • FIG. 5 is a drawing partially showing an internal space of an upper slewing body according to one aspect of the present disclosure.
  • a small electric excavator (1000) comprises a lower body (10), an upper slewing body (20) rotatably supported on the lower body (10), and a boom (31), an arm (32), and an attachment (33) operated by respective cylinders, and a working device (30) supported on the upper slewing body (20).
  • the lower drive body (10) supports the load of the upper slewing body (20) and the work device (30) and is configured to move the small electric excavator (1000) forward and backward or left and right for work purposes.
  • the upper swing body (20) is configured to be supported on the lower driving body (10) and is designed to rotate on the lower driving body (10) by a swing device including a swing motor, a swing reduction gear, etc.
  • the work device (30) is installed to be supported on the upper swivel body (20) and is configured to perform the work of the small electric excavator (1000). At this time, the work may mean various tasks in civil engineering and construction sites.
  • the work device (30) may be configured to include a boom (31), an arm (32), and an attachment (33) operated by each cylinder, and is installed while being supported toward the front of the upper swivel body (20). Therefore, when the upper swivel body (20) rotates, the work device (30) rotates together with the upper swivel body (20).
  • the upper swing body (20) includes a body frame (100), a cabin (200), and a counterweight (300).
  • the upper swivel body (20) is configured to include a body frame (100), a cabin (200) installed on the left side of the body frame (100), and a counterweight (300) installed on the rear side of the body frame (100).
  • the body frame (100) is rotatably installed on the lower driving body (10) by a swivel device. That is, the body frame (100) forms a support structure and constitutes the base of the upper swivel body (20).
  • the body frame (100) is a supporting structure surrounded by a front portion (100a), a rear portion (100b), a left side portion (100c), a right side portion (100d), an upper portion (100e), and a lower portion (100f).
  • the rear portion (100b) of the body frame (100) may be in the form of a rear cover.
  • a counterweight (300) is installed at the rear of the body frame, that is, on the lower side of the rear portion (100b).
  • a cabin (200) may be installed on the body frame (100), and the cabin (200) may preferably be installed on the left side of the centerline (CL) on the body frame (100).
  • An internal space capable of accommodating components is formed inside the body frame (100).
  • the cabin (200) may be provided with a driver's seat for the operator to sit in.
  • various handles or pedals for operating or driving the small electric excavator (1000) may be provided.
  • a counter weight (300) is installed at the rear of the body frame (100). This counter weight (300) is intended to balance the weight with the work device (30) and may be formed of a weight having a convex shape toward the rear.
  • FIG. 6 is a cross-sectional view taken along line A-A' of FIG. 2, schematically illustrating air flow inside a body frame according to one side of the present disclosure
  • FIG. 7 is a cross-sectional view taken along line B-B' of FIG. 3, schematically illustrating air flow inside a body frame according to one side of the present disclosure.
  • the small electric excavator (1000) of the present disclosure may include components such as a cooling fan (110), a radiator (120), an oil cooler (130), a main control valve (MCV) 140, an air conditioning system (HAVC) 150, a hydraulic tank (hydraulic tank) 160, an electric motor (electric motor) 170, a hydraulic pump (hydraulic pump) 180, a battery (ESS) 190), and other electric devices.
  • the other electric devices may include a converter, an inverter, a junction box, a motor drive, and the like.
  • These components of the small electric excavator (1000) may be provided in an internal space of an upper swivel body (20), more specifically, a body frame (100).
  • the small electric excavator (1000) has a narrow internal space and does not have enough space to accommodate the parts. Therefore, it is important to efficiently arrange each part. In particular, considering the location of the battery (190), it is desirable to form an air flow in a direction that does not affect battery cooling. In addition, in the small electric excavator (1000), parts such as the MCV (140), the hydraulic tank (160), and the hydraulic pump (180) that use hydraulic oil are the largest heat sources, so it is important to efficiently perform heat management of these parts.
  • an MCV (140), an HVAC (150), and a hydraulic tank may be arranged on the left side based on the center line (CL), and a cooling fan (110), a radiator (120), an oil cooler (130), a battery (190), an electric motor (170), a hydraulic pump (180), and other electric devices may be arranged on the right side.
  • one or more inlets (102, 103, 104, 105) for introducing cold air may be formed in the body frame (100), and an outlet (106) for introducing hot air through internal components may be formed at the front portion (100a) of the body frame (100) based on the centerline (CL).
  • the cooling fan (110) is for cooling the heat generated from the components constituting the small electric excavator (1000) with air, and can be placed right behind the outlet (106). This cooling fan (110) blows the internal air of the body frame (100) to force it to flow forward, thereby causing the internal air to flow out to the outside through the outlet (106).
  • the radiator (120) and oil cooler (130) constituting the heat exchanger may be placed immediately behind the cooling fan (110).
  • the radiator (120) is an element for releasing heat of cooling water for an electric device such as an electric motor (170)
  • the oil cooler (130) is an element for cooling hydraulic oil returning to the hydraulic tank (160) from a hydraulic device such as a work device (30).
  • radiators (120) and oil coolers (130) can be arranged in a row laterally at the rear of the cooling fan (110) and can be positioned downstream in the flow of cooling air by the cooling fan (110). That is, since the radiator (120) and oil cooler (130) are arranged immediately behind the cooling fan (110) and the cooling fan (110) is configured to blow the internal air of the body frame (100) forward, the air heated while passing through the radiator (120) can be discharged to the outside without affecting the battery (190).
  • the MCV (140) is for controlling the direction of hydraulic oil discharged from the hydraulic pump (180) to operate the work device (30), and may be placed on the left front side and the lower part of the cabin (200) based on the centerline (CL) inside the body frame (100).
  • a ventilation (101) may be formed on the lower part (100f) of the body frame (100) where the MCV (140) is positioned so that heat generated from the MCV (140) can be circulated by natural convection. That is, the ventilation (101) may be positioned on the lower side of the MCV (140).
  • the temperature of the MCV (140) can be raised to about 90° by the oil, and the air flowing in through the ventilation (101) can become hot as it passes through the MCV (140). In this way, if the air that becomes hot as it passes through the MCV (140) passes through the radiator (120) and the oil cooler (130), a problem may occur in which the cooling efficiency of the radiator (120) and the oil cooler (130) decreases.
  • a blocking wall (107) may be installed inside the body frame (100) to at least partially block the inflow of air from the left to the right with respect to the centerline (CL). That is, the blocking wall (107) blocks air heated while passing through the MCV (140) located at the left front inside the body frame (100) from moving to the radiator (120) and oil cooler (130) located at the right front, thereby preventing the cooling efficiency of the radiator (120) and oil cooler (130) from being reduced.
  • the hydraulic tank (160) is a hydraulic oil storage tank for supplying hydraulic oil to the hydraulic pump (180) and can be placed on the left rear side based on the center line (CL) inside the body frame (100).
  • a third inlet (104) may be formed on the lower surface (100f) of the body frame (100) where the hydraulic tank (160) is located to allow air to be introduced for cooling the hydraulic tank (160). That is, the third inlet (104) may be located on the lower side of the hydraulic tank (160).
  • the electric motor (170), the hydraulic pump (180), and the electric devices may be placed on the right rear side with respect to the centerline (CL) inside the body frame (100).
  • the electric motor (170) is configured to generate power for driving a small electric excavator (1000) using the electric energy of the battery (190), and the hydraulic pump (180) is configured to provide pressure for driving each component of the small electric excavator (1000) using the power generated from the electric motor (170). That is, the hydraulic pump (180) is driven by the power from the electric motor (170) and discharges a flow rate to drive the working device (30) and the lower travel body (10). For example, the hydraulic pump (180) provides pressure to the boom cylinder, the arm cylinder, and the attachment cylinder to drive the boom (31), the arm (32), and the attachment (33). At this time, the hydraulic pump (180) can receive hydraulic pressure from the hydraulic tank (160) and provide pressure to the working device (30).
  • the electric devices may include a converter, an inverter, a junction box, a motor drive, etc. These electric devices may be arranged on the right rear side with respect to the center line (CL) inside the body frame (100), preferably above the electric motor (170) and the hydraulic pump (180).
  • a converter is a device that changes the shape of a signal or energy. Such a converter may include a DC/DC converter that converts a DC power of a certain voltage into a DC power of a different voltage.
  • An inverter is a device that converts a DC power into an AC power. That is, the inverter converts the DC power of the battery (190) into an AC power of a certain voltage required to drive the electric motor (170).
  • the junction box controls the power transmitted to the battery (190) and controls the power stored in the battery (190) to be transmitted to peripheral components. That is, the junction box controls the power of the battery (190) to be transmitted to the converter, the inverter, etc.
  • the motor drive is an electronic control device that controls an electric motor (170) and can perform torque control, speed control, position control, etc. of the electric motor (170).
  • a first inlet (102) may be formed in the rear portion (100b) of the body frame (100) to allow air to be introduced for cooling the electric motor (170), the hydraulic pump (180), and the electric devices arranged at the rear inside the body frame (100).
  • the first inlet (102) may include one or more long holes (102a) extending in a horizontal direction.
  • the cold air introduced through the first inlet (102) may sequentially pass through the electric motor (170), the hydraulic pump (180), the electric devices, the radiator (120), and the oil cooler (130) arranged at the rear, and then be discharged to the outside through the cooling fan (110).
  • the electric motor (170), the hydraulic pump (180), and the electric devices located at the rear can be efficiently cooled.
  • the battery (190) may be placed in the center right of the centerline (CL) inside the body frame (100). More specifically, the battery (190) may be placed behind the radiator (120) and the oil cooler (130), and in front of the electric motor (170) and the hydraulic pump (180), and may be placed toward the right side (100d) of the body frame (100).
  • a second inlet (103) may be formed on the right side (100d) of the body frame (100) to allow air to be introduced for cooling the battery (190).
  • the cold air introduced through the second inlet (103) may sequentially pass through the battery (190), radiator (120), and oil cooler (130) and then be discharged to the outside through the cooling fan (110).
  • the first inlet (102), the second inlet (103), and the third inlet (104) described above have a long distance to the cooling fan (110) positioned at the front, the cold air introduced through the first inlet (102), the second inlet (103), and the third inlet (104) passes through several parts before reaching the radiator (120) and the oil cooler (130), and thus the cooling efficiency of the radiator (120) and the oil cooler (130) may not be good.
  • a fourth inlet (105) may be formed on the upper surface (100e) of the body frame (100) where the radiator (120) and oil cooler (130) are positioned to allow air to be introduced for cooling the radiator (120) and oil cooler (130).
  • the cooling efficiency of the radiator (120) and the oil cooler (130) can be increased.
  • the fourth inlet (105) may be formed in an inclined shape with the rear end open on the upper surface (100e) of the body frame (100).
  • the fourth inlet (105) is formed in an inclined shape with the rear end open, hot air blown forward by the cooling fan (110) and discharged through the outlet (106) formed in the front end (100a) can be prevented from entering the fourth inlet (105) again and lowering the cooling efficiency.
  • Figure 8 is a rear perspective view of the upper swivel body according to another aspect of the present disclosure.
  • the first inlet (102) may include one or more long holes (102a) in a horizontal direction, and an inclined hole (102b) extending obliquely from one end of the long hole (102a). That is, in order to improve the cooling efficiency of the hydraulic tank (130) and the hydraulic pump (180) arranged at the rear inside the body frame (100), an inclined hole (102b) extending from the long hole (102a) may be further formed, and it is preferable that the inclined hole (102b) be formed to be inclined downward in order to increase the amount of air flowing into the hydraulic tank (130) and the hydraulic pump (180).
  • the small electric excavator of the present disclosure efficiently manages the heat generation of hydraulic devices such as the MCV, hydraulic tank, and hydraulic pump that use hydraulic oil, which is the largest heat source, while at the same time arranging internal components and various cooling devices (cooling fan, radiator, oil cooler, inlet, outlet) so as not to affect the cooling of the battery, thereby improving the overall cooling efficiency of the small electric excavator.
  • hydraulic devices such as the MCV, hydraulic tank, and hydraulic pump that use hydraulic oil, which is the largest heat source

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

Un aspect de la présente invention concerne une petite excavatrice électrique comprenant un corps mobile inférieur, un corps rotatif supérieur et un dispositif de travail, le corps rotatif supérieur comprenant un bâti de carrosserie de véhicule, une cabine installée sur le côté gauche sur le bâti de carrosserie de véhicule, et un contrepoids installé sur le côté arrière du bâti de carrosserie de véhicule ; à l'intérieur du bâti de carrosserie de véhicule, par rapport à une ligne centrale, un MCV et un réservoir hydraulique sont disposés sur le côté gauche et un ventilateur de refroidissement, un radiateur, un refroidisseur d'huile, une batterie, un moteur électrique, une pompe hydraulique et des dispositifs électriques sont disposés sur le côté droit ; au moins une entrée à travers laquelle de l'air froid est introduit est formée dans le bâti de carrosserie de véhicule ; une sortie à travers laquelle de l'air chaud est évacué est formée dans une partie de surface avant du bâti de carrosserie de véhicule ; et le ventilateur de refroidissement est disposé directement derrière la sortie de façon à être conçu de manière à souffler de l'air à l'intérieur du bâti de carrosserie de véhicule vers l'avant.
PCT/KR2023/008381 2023-06-16 2023-06-16 Petite excavatrice électrique Pending WO2024257926A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2023/008381 WO2024257926A1 (fr) 2023-06-16 2023-06-16 Petite excavatrice électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2023/008381 WO2024257926A1 (fr) 2023-06-16 2023-06-16 Petite excavatrice électrique

Publications (1)

Publication Number Publication Date
WO2024257926A1 true WO2024257926A1 (fr) 2024-12-19

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ID=93852299

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2023/008381 Pending WO2024257926A1 (fr) 2023-06-16 2023-06-16 Petite excavatrice électrique

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WO (1) WO2024257926A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001227003A (ja) * 2000-02-18 2001-08-24 Hitachi Constr Mach Co Ltd 建設機械の冷却装置
US20050166429A1 (en) * 2002-03-26 2005-08-04 Kobelco Construction Machinery Co., Ltd Small swing type shovel
JP2007211395A (ja) * 2006-02-07 2007-08-23 Takeuchi Seisakusho:Kk 作業車
EP2009185B1 (fr) * 2005-10-12 2010-12-29 Kobelco Construction Machinery Co., Ltd. Machine de chantier.
KR20210002124U (ko) * 2020-03-17 2021-09-27 현대건설기계 주식회사 전기 굴착기

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001227003A (ja) * 2000-02-18 2001-08-24 Hitachi Constr Mach Co Ltd 建設機械の冷却装置
US20050166429A1 (en) * 2002-03-26 2005-08-04 Kobelco Construction Machinery Co., Ltd Small swing type shovel
EP2009185B1 (fr) * 2005-10-12 2010-12-29 Kobelco Construction Machinery Co., Ltd. Machine de chantier.
JP2007211395A (ja) * 2006-02-07 2007-08-23 Takeuchi Seisakusho:Kk 作業車
KR20210002124U (ko) * 2020-03-17 2021-09-27 현대건설기계 주식회사 전기 굴착기

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