US20170107684A1 - A coupler for a wheel loader - Google Patents

A coupler for a wheel loader Download PDF

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Publication number
US20170107684A1
US20170107684A1 US15/129,027 US201415129027A US2017107684A1 US 20170107684 A1 US20170107684 A1 US 20170107684A1 US 201415129027 A US201415129027 A US 201415129027A US 2017107684 A1 US2017107684 A1 US 2017107684A1
Authority
US
United States
Prior art keywords
locking pin
shaft
coupler
locking
threads
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.)
Abandoned
Application number
US15/129,027
Other languages
English (en)
Inventor
Yonghui DONG
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
Assigned to VOLVO CONSTRUCTION EQUIPMENT AB reassignment VOLVO CONSTRUCTION EQUIPMENT AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DONG, Yonghui
Publication of US20170107684A1 publication Critical patent/US20170107684A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • 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
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3631—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with a hook and a transversal locking element
    • 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
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3636—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat using two or four movable transversal pins
    • 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
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3668—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat where engagement is effected by a mechanical lever or handle
    • 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
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3672—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat where disengagement is effected by a mechanical lever or handle

Definitions

  • the present disclosure relates to a wheel loader, and more particularly, to an attachment coupler for a wheel loader.
  • Loaders have the facility for coupling and uncoupling an attachment with a lifting arm or for switching between various attachments such as a bucket, a clamp, or a fork.
  • a coupler is used to couple the attachment with the lifting arm.
  • Hydraulically powered displaceable pins are generally used for the attachment coupler's locking. Namely, the attachment is guided so that the locking holes are situated in a position in which displaceable pins can be shot through them, following which these pins, guided by controls located in the operating station, are hydraulically activated and shot into the holes, thereby locking the attachment with the lifting arm.
  • the hydraulically powered locking enables relatively rapid change of attachments without leaving the operating site, but it requires various hydraulic components such as actuators, conduits and valves, thus making a complex structure. Also, the engine and the whole machine should be turned on since this hydraulic coupler depends upon existing machine hydraulics for activating the locking pins.
  • manual couplers are relatively simple in structure, but they require substantial efforts and time from users for coupling or uncoupling for each and every locking position between the bracket and the attachment.
  • a working machine in this case a wheel loader which has a coupler for coupling an attachment to a lifting arm.
  • a coupler is installed between the lifting arm and the attachments such as a bucket, a clamp or a fork.
  • the bracket's back face is pivotally connected to the lifting arm and the bracket's front face is detachably connected to the attachment.
  • the attachment has a pair of protrusions rearwardly extending from the lower back of the attachment and laterally spaced apart from each other.
  • the protrusions have locking holes pierced through their width.
  • the bracket has a pair of receiving slots formed at the lower front of the bracket and engaged with the protrusions.
  • the coupler to lock the protrusions into the corresponding receiving slots comprises a shaft fixed to the bracket by means of fixtures and a pair of locking pins combined with the shaft by threads.
  • the shaft has threads formed at both ends.
  • the threads formed at the one end of the shaft are right handed and the threads formed at the other end of the shaft are left handed.
  • the locking pins are tubular, and inserted into the ends of the shaft, respectively.
  • the internal surface of the first tubular locking pin has threads corresponding to the threads formed at the one end of the shaft.
  • the internal surface of the second tubular locking pins has threads corresponding to the threads formed at the other end of the shaft.
  • the locking pins are longitudinally divided into two parts, that is, a cylindrically cross-sectioned outer part and a non-cylindrically cross-sectioned inner part.
  • the cross-section of the inner part can be partially flattened cylindrical shape or polygonal shape.
  • a pair of holders are provided to support each of the locking pins.
  • the holders are fixed to the bracket.
  • the contacting surface of the holder corresponds to the non-cylindrical contour of the inner part of the locking pin, thereby preventing the locking pin from being rotated when the shaft is driven to rotate. That is, the locking pins are rectilinearly moved due to a thread interaction when the shaft rotates.
  • the shaft has a driving section with a polygonal cross-section in order to enable users to turn the shaft easily by using appropriate means such as a wrench.
  • the threads formed at the shafts and the locking pins are multiple start threads which provide bigger screw pitch so that the lead per rotation can be increased, which can consequently minimize the effort of users when turning the shaft.
  • the coupler of the present disclosure enables users to couple or uncouple the attachment by one touch turning operation, thus reducing the effort of users and saving time at work sites.
  • FIG. 1 is a perspective view of the coupler and the attachment according to one embodiment of the present disclosure
  • FIG. 2 is a disassembled perspective view of the coupler according to one embodiment of the present disclosure
  • FIG. 3A shows the coupler in its coupling position where the locking pins are fully extended
  • FIG. 3B shows the coupler in its release position where the locking pins are fully shortened
  • FIG. 4 is a perspective view of the bracket seen from the lifting arm side and an enlarged view of part “A”;
  • FIG. 5 is a disassembled perspective view of the coupler according to another embodiment of the present disclosure.
  • FIG. 1 shows a perspective view of a bracket 100 and an attachment 102 according to one embodiment of the present disclosure.
  • Bracket 100 has a back face pivotally connected to the free end of a lifting arm (not shown) of a wheel loader and a front face detachably connected to attachment 102 .
  • the wheel loader is an example of the working machine to which the coupler of the present disclosure applies. Therefore, it should be understood that this coupler can apply to various kinds of working machine which has a detachable and interchangeable tools as an attachment. Some examples of such working machine are wheel loaders, track loaders, excavators, and dozers.
  • the bucket is an example of the attachment to which the coupler of the present disclosure applies. It should be understood that this coupler can apply to various kinds of attachment, for example, a clamp, a fork, a breaker or a crusher.
  • Attachment 102 has a pair of hooks 110 a , 110 b rearwardly extending from the upper back of attachment 102 and laterally spaced apart from each other.
  • Bracket 100 has a pair of cross bars 112 a , 112 b installed at the upper front of bracket 100 .
  • Attachment 102 has a pair of protrusions 104 a , 104 b .
  • Protrusions 104 a , 104 b are rearwardly extended from the lower back of attachment 102 and laterally spaced apart from each other.
  • Protrusions 104 a , 104 b have locking holes 106 a , 106 b pierced through their width.
  • Bracket 100 has a pair of receiving slots 108 a , 108 b .Receiving slots 108 a , 108 b are formed at the lower front of bracket 100 and engaged with protrusions 104 a , 104 b.
  • FIG. 2 shows a disassembled perspective view of a coupler 200 according to the embodiment of the present disclosure.
  • the coupler 200 comprises a shaft 202 and a pair of tubular locking pins 204 a , 204 b combined with shaft 202 by threads.
  • Shaft 202 has threads 216 a , 216 b formed at both ends.
  • the threads formed at the one end of shaft 202 ( 216 a ) are “right handed” and the threads formed at the other end of shaft 202 ( 216 b ) are “left handed”.
  • Locking pins 204 a , 204 b are, at least partially, tubular and inserted into the ends of shaft 202 , respectively.
  • the inside of the first tubular locking pin 204 a has threads 218 a corresponding to the threads 216 a formed at the one end of shaft 202 .
  • the inside of the second tubular locking pin 204 b has threads 218 b corresponding to the threads 216 b formed at the other end of shaft 202 .
  • the first locking pin 204 a is longitudinally divided into two parts, that is, a cylindrically cross-sectioned outer part 212 a and a non-cylindrically cross-sectioned inner part 210 a .
  • the cross-section of inner part 210 a can be shaped into a partially flattened cylindrical shape or a polygonal shape.
  • the second locking pin 204 b is longitudinally divided into two parts, that is, a cylindrically cross-sectioned outer part 212 b and a non-cylindrically cross-sectioned inner part 210 b .
  • the cross-section of inner part 210 b can be shaped into a partially flattened cylindrical shape or a polygonal shape.
  • a pair of holders 214 a , 214 b are provided to support corresponding locking pins 204 a , 204 b , respectively. Holders 214 a , 214 b are fixed to bracket 100 .
  • the contacting surface of the first holder 214 a corresponds to the non-cylindrical contour of the inner part 210 a of the first locking pin 204 a . Therefore, the first locking pin 204 a is prevented from being rotated when shaft 202 is driven to rotate. In other words, the first locking pin 204 a is rectilinearly moved due to a thread interaction when shaft 202 rotates.
  • the contacting surface of the second holder 214 b corresponds to the contour of the inner part 210 b of the second locking pin 204 b . Therefore, the second locking pin 204 b is prevented from being rotated when shaft 202 is driven to rotate. In other words, the second locking pin 204 b is rectilinearly moved due to a thread interaction when shaft 202 rotates.
  • the longitudinal lengths of inner parts 210 a , 210 b are longer than or at least equal to the rectilinear moving strokes of locking pins 204 a , 204 b along shaft 202 so that the rotations of locking pins 204 a , 204 b are prevented throughout the entire strokes of locking pins 204 a , 204 b.
  • FIG. 3A shows this coupling position where locking pins 204 a , 204 b are fully extended.
  • FIG. 3B shows this release position where locking pins 204 a , 204 b are fully shortened.
  • the threads 216 a , 216 b of shaft 202 and the threads 218 a , 218 b of locking pins 204 a , 204 b are multi start threads.
  • the multi start threads increase the lead per rotation of locking pins 204 a , 204 b . Accordingly, locking pins 204 a , 204 b can have longer rectilinear moving strokes relative to the rotation of shaft 202 .
  • quadruple start threads are used. Consequently, these multiple start threads minimize the effort of users when turning the shaft.
  • shaft 202 has a driving section 208 with a polygonal cross-section in order to enable users to turn shaft 202 easily by using an appropriate tool such as a wrench.
  • the cross-section of driving section 208 is shaped as hexagonal, and a hexagonal wrench is used to turn shaft 202 .
  • FIG. 4 shows a perspective view of bracket 100 of the embodiment of the present disclosure seen from a lifting arm side, i.e., the back face of bracket 100 and an enlarged view of part “A”.
  • reference numerals 206 a , 206 b are fixtures used to affix shaft 202 to bracket 100 .
  • Fixtures 206 a and 206 b wrap around shaft 202 at the right side and at the left side of driving section 208 , respectively, in a less frictional manner and bolted to bracket 100 at their edges.
  • An anti-friction material or coating (not shown) can be used on the contacting surfaces between fixtures 206 a , 206 b and shaft 202 .
  • Bracket 100 has an opening 304 in order to allow users to access to drive section 208 of shaft 202 with a wrench.
  • coupler 200 has a coupling position of the attachment in which locking pins 204 a , 204 b are extended and engaged with locking holes 106 a , 106 b , and a release position of the attachment in which locking pins 204 a , 204 b are shortened and released from locking holes 106 a , 106 b .
  • reference numerals 114 a , 114 b are apertures formed at the outer walls 116 a , 116 b of receiving slots 108 a , 108 b . These apertures 114 a , 114 b secure the end of locking pins 204 a , 204 b in the coupling position of the attachment. Apertures 114 a , 114 b can be replaced with indentations in which the end of locking pins 204 a , 204 b would not be exposed from the outer walls 116 a , 116 b.
  • users can achieve coupling or uncoupling the attachment to the machine by simply turning the shaft in one direction or the other.
  • Such a one touch operation provided by the embodiment minimizes the effort of users for coupling/uncoupling the attachment and saves time at work sites.
  • FIG. 5 shows a disassembled perspective view of a coupler according to another embodiment of the present disclosure.
  • FIG. 5 shows only a locking pin 412 b of a pair of locking pins and doesn't show the opposite locking pin.
  • the opposite locking pin has a same structure and function as locking pin 412 b , so it can be understood without additional details.
  • the cross-sections of locking pin 412 b are non-cylindrical along their entire lengths or at least along their outer parts that are subject to be engaged with the locking holes of the protrusions.
  • the cross-sections of this locking pin 412 b can be shaped into a partially flattened cylindrical shape or a polygonal shape.
  • the contacting surface 414 of the locking hole 416 of the protrusion correspond to the contour, i.e., the non-cylindrical cross-sections, of locking pin 412 b , thereby preventing locking pin 412 b from being rotated when it is inserted into locking hole 416 .
  • the contacting surfaces of aperture 418 formed at inner wall 420 of receiving slot 422 are also corresponding to the contour, i.e., the non-cylindrical cross-sections, of locking pin 412 b .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Agricultural Machines (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Shovels (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Connection Of Plates (AREA)
US15/129,027 2014-03-27 2014-03-27 A coupler for a wheel loader Abandoned US20170107684A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/074212 WO2015143673A1 (en) 2014-03-27 2014-03-27 A coupler for a wheel loader

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/074212 A-371-Of-International WO2015143673A1 (en) 2014-03-27 2014-03-27 A coupler for a wheel loader

Related Child Applications (1)

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US16/423,520 Division US10676891B2 (en) 2014-03-27 2019-05-28 Coupler for a wheel loader

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US20170107684A1 true US20170107684A1 (en) 2017-04-20

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US15/129,027 Abandoned US20170107684A1 (en) 2014-03-27 2014-03-27 A coupler for a wheel loader
US16/423,520 Active US10676891B2 (en) 2014-03-27 2019-05-28 Coupler for a wheel loader

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US16/423,520 Active US10676891B2 (en) 2014-03-27 2019-05-28 Coupler for a wheel loader

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US (2) US20170107684A1 (de)
EP (1) EP3122945A4 (de)
CN (1) CN106460358B (de)
WO (1) WO2015143673A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10370804B2 (en) * 2016-06-30 2019-08-06 Caterpillar Paving Products Inc. Quick change milling assembly for a cold planer
US10934670B1 (en) 2019-09-11 2021-03-02 Caterpillar Paving Products Inc. Quick change chamber for milling machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2544789B (en) * 2015-11-27 2019-04-17 Caterpillar Inc A worktool conversion bracket

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7225566B1 (en) * 2003-04-09 2007-06-05 Jrb Attachments, Llc Hybrid male coupler portion for a front-end loader
US20110280648A1 (en) * 2009-01-23 2011-11-17 Gianluca Malacrino Quick coupling device for work vehicles and machines in general

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096957A (en) * 1977-07-18 1978-06-27 Caterpillar Tractor Co. Pivot pin assembly
DE9315868U1 (de) * 1993-10-18 1995-02-16 Liebherr-Hydraulikbagger GmbH, 88457 Kirchdorf Kupplung
DE29708705U1 (de) * 1997-05-16 1997-07-10 Caterpillar Vibra-Ram GmbH & Co.KG, 66482 Zweibrücken Abbruchgerät für schwere Beanspruchungen, insbesondere Abbruch- oder Schrottschere
US6227792B1 (en) * 1997-06-30 2001-05-08 Caterpillar S.A.R.L. Vertical engagement hydraulic tool coupler
DE29909329U1 (de) * 1999-05-28 1999-08-12 Liebherr-Hydraulikbagger GmbH, 88457 Kirchdorf Schnellkupplung für Baggerwerkzeuge
SE525388C2 (sv) * 2003-04-16 2005-02-08 Volvo Constr Equip Holding Se Arbetsmaskin, innefattande en redskapshållare, och redskapslåselement
US7168908B2 (en) 2005-04-27 2007-01-30 Caterpillar Inc Work tool coupling device for a machine
BRPI0710399A2 (pt) * 2006-04-20 2011-08-09 Caterpillar Inc engate rápido e implemento
MX2010012166A (es) * 2008-05-07 2011-05-19 Attachment Technologies Inc Sistema de acoplamiento para cargadora de desplazamiento nulo y componentes.
CA2731443A1 (en) * 2011-02-09 2012-08-09 Garier Inc. Quick coupler for earth working machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7225566B1 (en) * 2003-04-09 2007-06-05 Jrb Attachments, Llc Hybrid male coupler portion for a front-end loader
US20110280648A1 (en) * 2009-01-23 2011-11-17 Gianluca Malacrino Quick coupling device for work vehicles and machines in general

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10370804B2 (en) * 2016-06-30 2019-08-06 Caterpillar Paving Products Inc. Quick change milling assembly for a cold planer
US10794018B2 (en) 2016-06-30 2020-10-06 Caterpillar Paving Products Inc. Quick change milling assembly for a cold planer
US10934670B1 (en) 2019-09-11 2021-03-02 Caterpillar Paving Products Inc. Quick change chamber for milling machine

Also Published As

Publication number Publication date
US10676891B2 (en) 2020-06-09
US20190277003A1 (en) 2019-09-12
CN106460358A (zh) 2017-02-22
CN106460358B (zh) 2018-10-09
WO2015143673A1 (en) 2015-10-01
EP3122945A4 (de) 2017-11-08
EP3122945A1 (de) 2017-02-01

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