EP2796622A1 - Pilot valve attachment structure of construction machine - Google Patents

Pilot valve attachment structure of construction machine Download PDF

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Publication number
EP2796622A1
EP2796622A1 EP12860616.7A EP12860616A EP2796622A1 EP 2796622 A1 EP2796622 A1 EP 2796622A1 EP 12860616 A EP12860616 A EP 12860616A EP 2796622 A1 EP2796622 A1 EP 2796622A1
Authority
EP
European Patent Office
Prior art keywords
pilot valve
seal member
shaped seal
casing
floor plate
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.)
Withdrawn
Application number
EP12860616.7A
Other languages
German (de)
English (en)
French (fr)
Inventor
Tomoyuki Tanaka
Hiroshi Tabeta
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Publication of EP2796622A1 publication Critical patent/EP2796622A1/en
Withdrawn legal-status Critical Current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
    • E02F9/16—Cabins, platforms, or the like, for drivers
    • 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
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0833—Improving access, e.g. for maintenance, steps for improving driver's access, handrails
    • 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
    • E02F9/0875—Arrangement of valve arrangements on 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
    • E02F9/2004—Control mechanisms, e.g. control levers

Definitions

  • the present invention relates to a pilot valve attachment structure of a construction machine, which is provided in a construction machine such as a compact excavator and is configured such that a pilot valve included in a travel operation device arranged in front of an operator's seat is attached to a floor plate.
  • Patent document 1 JP 2011-64064 A (Patent document 1) describes the prior arts.
  • the techniques disclosed in Patent document 1 relates to a structure in which a pilot valve included in a travel operation device provided in an excavator having an travel base, a upperstructure, and a working device is attached to a flat-shaped floor of an operator's seat, that is, a floor plate.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2011-64064 A
  • the present invention was made in view of such problems stemming from the conventional techniques described above, and an object of the present invention is to provide a pilot valve attachment structure of a construction machine which can reduce an oppressive sensation that an operator sitting on an operator's seat is likely to feel.
  • the present invention provides a pilot valve attachment structure of a construction machine that includes a travel base, a upperstructure arranged on the travel base, a working device attached to the upperstructure, an operator's seat arranged on a floor plate that is formed on the upperstructure, and a travel operation device arranged in front of the operator's seat and having a pilot valve, the pilot valve included in the travel operation device being attached to the floor plate, wherein a recessed part having a hole, into which a casing forming an outer frame of the pilot valve can be inserted, on a bottom part thereof is provided on the floor plate, the casing of the pilot valve is attached to the bottom part of the recessed part in a state where the casing of the pilot valve is inserted into the hole of the recessed part, and a mat shaped seal member for sealing a space that is formed around the casing of the pilot valve when the casing is inserted into the hole of the recessed part.
  • the present invention is configured such that the casing of the pilot valve is attached on the bottom part of the recessed part of the floor plate, and accordingly, the casing of the pilot valve can be attached to the floor plate such that the top surface of the pilot valve projecting from the top surface of the floor plate is low. Because the recessed part is formed in the floor plate, there is concern that contaminants, such as mud or muddy water, may enter the inside of the pilot valve through the recessed part, however, the mat shaped seal member that seals a space formed around the casing of the pilot valve can prevent the contaminants such as mud or muddy water from entering the inside of the pilot valve.
  • the mat shaped seal member is made of a rubber member. With this configuration, the mat shaped seal member can be bended due to elasticity and is easily attached to or removed from the recessed part of the floor plate.
  • the mat shaped seal member consists of a first divided member and a second divided member that are dividedly formed so as to interpose the casing of the pilot valve therebetween.
  • the mat shaped seal member includes a projection part on a lower side thereof, and a hole part into which the projection part is inserted is formed on the bottom part of the recessed part.
  • the mat shaped seal member is attached to the recessed part so that a top surface of the mat shaped seal member forms approximately the same plane as a top surface of the floor plate and the top surface of the mat shaped seal member becomes in the height equal to or higher than that of the floor plate.
  • the present invention is configured such that a pilot vale is attached to a recessed part formed in a floor plate, and accordingly, a part of the pilot valve projecting from the floor plate can be made lower than that of a conventional structure.
  • a mat shaped seal member seals a space formed around the pilot valve, it is possible to prevent contaminants such as mud or muddy water from entering the inside of the pilot valve, and thus it is possible to realize to maintain good performance of the pilot valve as well as to secure excellent durability thereof.
  • a construction machine provided with a pilot valve attachment structure according to the present invention constitutes a small sized machine and is a compact excavator whose operation space of an operation device to be arranged in an operator's cab is relatively narrow.
  • the compact excavator includes a travel base 1, an upperstructure 2 that is arranged on the travel base 1, and a working device 3 that is attached to the upperstructure 2 with being rotatable in a vertical direction.
  • the working device 3 includes a boom 4 to be attached to the upperstructure 2, an arm 5 to be attached to a tip of the boom 4, and a bucket 6 to be attached to a tip of the arm 5.
  • the upperstructure 2 is provided with an operator's cab 7 and a counterweight 8 for securing weight balance.
  • a machine room 9 in which an engine, a hydraulic pump, etc., are accommodated is arranged between the operator's cab 7 and the counterweight 8.
  • an operator's seat 10 on which an operator sits is arranged, and as illustrated in FIG. 2 , a travel operation device 11 including an operation lever 16, an operation pedal 17, and a pilot valve 18 for traveling is arranged in front of the operator's seat 10.
  • Work operation devices 10a, 10b are arranged respectively on both sides of the operator's seat 10.
  • the pilot valve attachment structure of a construction machine includes a floor plate 15 of the operator's cab 7 which is provided with a recessed part 20.
  • a hole 20b into which a casing 18a forming an outer frame of the pilot valve 18 can be inserted is provided on a bottom part 20a of the recessed part 20, a hole 20b into which a casing 18a forming an outer frame of the pilot valve 18 can be inserted is provided.
  • the casing 18a of the pilot valve 18 is attached to the bottom part 20a of the recessed part 20 in a state where the casing 18a of the pilot valve 18 is inserted into the hole 20b of the recessed part 20.
  • the present embodiment includes a mat shaped seal member 21 for sealing a space that is formed around the casing 18a of the pilot valve 18 when the casing 18a is inserted into the hole 20b of the recessed part 20.
  • the mat shaped seal member 21 is made of a rubber member, and as illustrated in FIGs. 4 and 6 , consists of a first divided member 21a and a second divided member 21b that are dividedly formed so as to interpose the casing 18a of the pilot valve 18 therebetween.
  • the mat shaped seal member 21 includes a projection part 22 on a lower side thereof.
  • a hole part 23 into which the projection part 22 is inserted is provided on the bottom part 20a of the recessed part 20, a hole part 23 into which the projection part 22 is inserted is provided.
  • the mat shaped seal member 21 is attached to the recessed part 20 so that a top surface of the mat shaped seal member 21 forms approximately the same plane as a top surface of the floor plate 15 and the top surface of the mat shaped seal member 21 becomes in the height equal to or higher than that of the floor plate 15.
  • a mounting height of the pilot valve 18 to be attached to the recessed part 20 of the floor plate 15 is set such that a height position from the floor plate 15 to a top surface of the casing 18a of the pilot valve 18 is to be a relatively low height position H that is within a range where the floor plate 15 is not contact with the heel 30a of a shoe 30 of an operator when the operator sitting on the operator' s seat 10 steps on the operation pedal 17.
  • the height position H is set to be about 20 mm.
  • the upperstructure 2 revolves or the working device 3 rotates in a vertical direction to perform such as digging work of earth and sand via the bucket 6.
  • the pilot valve 18 activates and a travel directional control valve (not shown) is switched. Accordingly, pressure oil is supplied from a hydraulic pump accommodated in the machine room 9 to left and right motors via the travel directional control valve so that the travel base 1 can travel.
  • the casing 18a of the pilot valve 18 is attached to the bottom part 20a of the recessed part 20 of the floor plate 15, the casing 18a of the pilot valve 18 can be attached to the floor plate 15 such that the top surface of the pilot valve 18 projecting from the top surface of the floor plate 15 is low.
  • an oppressive sensation that an operator sitting on the operator's seat 10 is likely to feel in a limited narrow operation space can be reduced, and it is possible to secure a comfortable operability.
  • the recessed part 20 is formed in the floor plate 15, there is concern that contaminants, such as mud attached to shoes of an operator or muddy water generated at the time of washing the mud, may enter the inside of the pilot valve 18 through the recessed part 20, however, the mat shaped seal member 21 that seals a space formed around the casing 18a of the pilot valve 18 can prevent the contaminants such as mud or muddy water from entering the inside of the pilot valve 18.
  • the mat shaped seal member 21 is made of a rubber member, the mat shaped seal member 21 can be bended due to elasticity and is easily attached to or removed from the recessed part 20 of the floor plate 15.
  • the mat shaped seal member 21 is dividedly formed into the first divided member 21a and the second divided member 21b so as to be separated with each other, an operation for disposing the mat shaped seal member 21 around the casing 18a of the pilot valve 18 can be easily performed.
  • the projection part 22 of the mat shaped seal member 21 is inserted into the hole part 23 of the floor plate 15, it is possible to easily position the mat shaped seal member 21 within the recessed part 20 and to stably hold the mat shaped seal member 21 which is attached to the recessed part 20 of the floor plate 15, without causing any positional deviation with respect to the recessed part 20.
  • the mat shaped seal member 21 is attached to the recessed part 20 such that the top surface of the mat shaped seal member 21 forms approximately the same plane as that of the floor plate 15 and the top surface of the mat shaped seal member 21 becomes in the height equal to or higher than that of the floor plate 15, contaminants such as mud or muddy water hardly enter the recessed part 20, and thus it is possible to certainly prevent the contaminants from entering the inside of the pilot valve 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Operation Control Of Excavators (AREA)
EP12860616.7A 2011-12-21 2012-10-02 Pilot valve attachment structure of construction machine Withdrawn EP2796622A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011280019A JP2013129996A (ja) 2011-12-21 2011-12-21 建設機械のパイロットバルブ取り付け構造
PCT/JP2012/075514 WO2013094277A1 (ja) 2011-12-21 2012-10-02 建設機械のパイロットバルブ取り付け構造

Publications (1)

Publication Number Publication Date
EP2796622A1 true EP2796622A1 (en) 2014-10-29

Family

ID=48668183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12860616.7A Withdrawn EP2796622A1 (en) 2011-12-21 2012-10-02 Pilot valve attachment structure of construction machine

Country Status (6)

Country Link
US (1) US20140306488A1 (ko)
EP (1) EP2796622A1 (ko)
JP (1) JP2013129996A (ko)
KR (1) KR20140113670A (ko)
CN (1) CN104011299A (ko)
WO (1) WO2013094277A1 (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6317706B2 (ja) * 2015-06-02 2018-04-25 株式会社日立建機ティエラ 作業機械
JP6511419B2 (ja) * 2016-09-01 2019-05-15 株式会社日立建機ティエラ 小型油圧ショベル

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251534A (en) * 1992-04-29 1993-10-12 Kayaba Industry Co. Ltd. Input apparatus
JP3146152B2 (ja) * 1996-04-05 2001-03-12 株式会社クボタ バックホウ
JP4537289B2 (ja) * 2005-08-15 2010-09-01 日立建機株式会社 建設機械
JP5172813B2 (ja) * 2009-11-20 2013-03-27 日立建機株式会社 建設機械
JP5180248B2 (ja) * 2010-03-09 2013-04-10 株式会社神戸製鋼所 油圧配管の支持構造及びこれを備えた作業機械
BR112012026074A2 (pt) * 2010-04-12 2016-06-28 Volvo Compact Equipment Sas escavador e processo para montagem ou desmontagem de tal escavador
JP5024443B2 (ja) 2010-10-27 2012-09-12 コベルコ建機株式会社 建設機械のバルブ操作装置
US8967309B2 (en) * 2010-11-29 2015-03-03 Hitachi Construction Machinery Co., Ltd. Construction machine
EP2674310B1 (en) * 2011-02-07 2019-11-13 Hitachi Construction Machinery Tierra Co., Ltd. Air conditioning unit for the cabin of a construction machine
US8950801B2 (en) * 2011-08-09 2015-02-10 Hitachi Construction Machinery Co., Ltd. Construction machine
EP2754756B1 (en) * 2011-09-09 2017-08-16 Hitachi Construction Machinery Tierra Co., Ltd. Air-conditioning unit for the cabin of a construction machine
WO2013051609A1 (ja) * 2011-10-05 2013-04-11 日立建機株式会社 建設機械

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013094277A1 *

Also Published As

Publication number Publication date
CN104011299A (zh) 2014-08-27
WO2013094277A1 (ja) 2013-06-27
JP2013129996A (ja) 2013-07-04
US20140306488A1 (en) 2014-10-16
KR20140113670A (ko) 2014-09-24

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