EP1554436A1 - Abutment for wear element - Google Patents

Abutment for wear element

Info

Publication number
EP1554436A1
EP1554436A1 EP03751624A EP03751624A EP1554436A1 EP 1554436 A1 EP1554436 A1 EP 1554436A1 EP 03751624 A EP03751624 A EP 03751624A EP 03751624 A EP03751624 A EP 03751624A EP 1554436 A1 EP1554436 A1 EP 1554436A1
Authority
EP
European Patent Office
Prior art keywords
bolt
bucket front
excavating tooth
excavating
tooth
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.)
Granted
Application number
EP03751624A
Other languages
German (de)
French (fr)
Other versions
EP1554436B1 (en
Inventor
Tor Torgrimsen
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.)
Komatsu KVX LLC
Original Assignee
Komatsu KVX LLC
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 Komatsu KVX LLC filed Critical Komatsu KVX LLC
Publication of EP1554436A1 publication Critical patent/EP1554436A1/en
Application granted granted Critical
Publication of EP1554436B1 publication Critical patent/EP1554436B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/2816—Mountings therefor
    • E02F9/2833—Retaining means, e.g. pins

Definitions

  • This invention relates to a single bolt excavating tooth- securing element for employment on the share- or bucket front of earth-moving machines. More specifically, it concerns a removable excavating tooth securing element, where the fastening bolt of the securing element is only exposed to tensile forces in its working position.
  • Exchangeable excavating teeth can be connected to the share- or bucket front by means of e.g. a bayonet connection
  • US patent 1.419.047 shows such a solution, or by means of at least two bolts, where one embodiment appears in US patent 4.108.250.
  • the pre-stressed bolts that are arranged to press the abutment surface of the excavating tooth against the bucket front are according to prior art relatively short.
  • the pre- stressed bolts are therefore provided with a function which is equivalent to a stiff spring with little drift.
  • the pre- stressed bolts can therefore only to a minor degree absorb distance changes between the abutment surfaces in the tensile direction of. the bolts. This relationship presupposes that the abutment surfaces of the excavating teeth and the bucket front must be exactly fitted to each other, for example by means of machining.
  • the object of the invention is to remedy the disadvantages of the prior art.
  • the excavating tooth securing element By constructing the excavating tooth securing element such that the . excavating tooth is connected to the bucket front by means of one pre-stressed bolt which is approximately perpendicular relative to the plane of attachment, below denoted bolt, where the bolt in its working position substantially is exposed to tensile force only, the forces which affect the bolt and the rest of the securing element are moreover defi- ned in an essentially more secure way, relative to prior art.
  • the forces which work parallel to the plane of attachment between the excavating tooth and the bucket front, and also the torque along the longitudinal axis of the bolt, are absorbed by cams which protrude from one part and into the corresponding recesses in the other part, for example from the excavating teeth and into the bucket front.
  • the cams can be formed by separate or jointed bodies which protrude into the corresponding recesses both in the excavating tooth and the bucket front.
  • the cams are semi-spherical, where at least three cams are placed at a suitable radial distance
  • each cam is adapted such that the cam bottoms in its complementary recess.
  • the excavating tooth surface surrounding the cams thus does not rest on the bucket front.
  • the embodiment according to the invention forms a "softer" connection, in that both bolt and the material of the tooth are pre-stressed and are arranged to absorb less changes in distance between the excavating tooth and the bucket front in the longitudinal direction of the bolt.
  • an excavating tooth according to the invention Due to the definable load pattern which works on the different parts of the excavating tooth securing element, the dimensions of the securing part of the excavating tooth can be reduced relative to excavating teeth according to prior art.
  • An excavating tooth according to the invention has smaller structural dimensions and, at the same time, fitting and replacement work is considerably simplified.
  • Figure 2 shows a section I-I in figure 1;
  • FIG. 3 shows a section I-I in figure 1, but here the cams are formed by separate bodies
  • Figure 4 shows a the front part of the excavating bucket seen from above where adapters and excavating teeth are fitted
  • Figure 5 shows in perspective and partly in section an adapter and a excavating tooth according to figure 4.
  • the reference number 1 represents a reversible excavating tooth which is secured to the bucket front 4 of an excavating bucket 2 by means of a pre-stressed bolt 6 and four cams 8.
  • the bolt 6 is screwed into the corresponding threads 7 in the bucket front 4.
  • the cams 8 protrude from the surface part 10 of the excavating tooth 1 and faces towards the bucket front 4 and into the corresponding recesses 12 in the bucket front 4.
  • the cams 8 are designed such that they bottom in the recesses 12.
  • the surface part 10 has therefore, both before and. after the bolt 6 is tightened, a clearance to the bucket front 4, and forms therefore, together with a part of the excavating tooth 1, a bolt bridge 11 which is provided with a countersunk through bore 13 for the bolt 6.
  • the bolt 6 When the bolt 6 is tightened, the bolt 6 is pre-stressed at the same time as the bolt bridge 11 of the excavating tooth 1 is provided with a bending stress.
  • the bending stress arises in that the tensile force of the bolt 6 seeks to displace the surface part 10 around the bolt 6 in towards the bucket front 4, while the cams 8, which bottoms in their recesses 12, form supports for the excavating tooth 1.
  • an excavating tooth 18 is connected to a bucket front 20 by means of an adapter 22.
  • the excavating tooth 18 is attached to the adapter 22 by means of a slot and a bolt in a manner known per se.
  • the adapter 22 is secured to the bucket front 20 in a manner corresponding to that described for the reversible excavating tooth 1, but here three cams 8 and corresponding recesses 12 are employed.
  • the shape of the cams 8 can take any suitable form where the form causes a bolt bridge 11 to be created, and where the bolt 6 tightens against the bridge between the supports of the bridges.
  • one non-circular cam which encircles the bolt 6 at a radial distance from the bolt 6, can also form a cam according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Abstract

Arrangement of a single bolt (4) digging tooth attachment excavating tooth securing element for employment on the share-cutting or bucket front (4, 20) of earth moving machines, and where an diggingexcavating tooth (1) or the adapter (22) for an diggingexcavating tooth (1) is securedattached to the bucket front (4, 20) by means of at least one cam (8) where the cam (8) formsconstitutes a support for a bolt bridge (11).

Description

ABUTMENT FOR WEAR ELEMENT
This invention relates to a single bolt excavating tooth- securing element for employment on the share- or bucket front of earth-moving machines. More specifically, it concerns a removable excavating tooth securing element, where the fastening bolt of the securing element is only exposed to tensile forces in its working position.
Exchangeable excavating teeth can be connected to the share- or bucket front by means of e.g. a bayonet connection, US patent 1.419.047 shows such a solution, or by means of at least two bolts, where one embodiment appears in US patent 4.108.250.
It is also known to connect a reversible excavating tooth to a flat bucket front by means of two pre-stressed bolts, or by means of a bolt and a locking pin such as is shown in the
Norwegian patent NO 171605.
P20308PCOO-DE - 29.09.2003 The employment of reversible excavating teeth has proven to be economically advantageous in that excavating teeth of this type are equipped with two wear parts. When one wear part is worn out, the excavating teeth can be reversed, after which the other wear part can be employed.
The pre-stressed bolts that are arranged to press the abutment surface of the excavating tooth against the bucket front, are according to prior art relatively short. The pre- stressed bolts are therefore provided with a function which is equivalent to a stiff spring with little drift. The pre- stressed bolts can therefore only to a minor degree absorb distance changes between the abutment surfaces in the tensile direction of. the bolts. This relationship presupposes that the abutment surfaces of the excavating teeth and the bucket front must be exactly fitted to each other, for example by means of machining.
Experience shows that the friction forces between the excavating tooth and the bucket front during the relatively rough treatment a excavating tooth is exposed to, are not sufficient to resist the forces which arise in directions parallel with the plane of attachment. Thus, the pre-stressed bolts must also be able to absorb considerable shear and bending forces, according to prior art.
Those in the pre-stressed bolts occurring loads are difficult to calculate, and this undefined load-effect means that the pre-stressed bolts must be dimensioned using a higher load safety factor to prevent the excavating teeth from loosening. Bolt mounted excavating teeth, according to prior art, are
P20308PC00-DE - 29.09.2003 therefore unnecessarily large and heavy due to extra material between the bolts.
The object of the invention is to remedy the disadvantages of the prior art.
This object is achieved according to the invention, and by means of the features disclosed in the description below, and in the following patent claims .
By constructing the excavating tooth securing element such that the . excavating tooth is connected to the bucket front by means of one pre-stressed bolt which is approximately perpendicular relative to the plane of attachment, below denoted bolt, where the bolt in its working position substantially is exposed to tensile force only, the forces which affect the bolt and the rest of the securing element are moreover defi- ned in an essentially more secure way, relative to prior art.
According to the invention the forces which work parallel to the plane of attachment between the excavating tooth and the bucket front, and also the torque along the longitudinal axis of the bolt, are absorbed by cams which protrude from one part and into the corresponding recesses in the other part, for example from the excavating teeth and into the bucket front. Alternatively, the cams can be formed by separate or jointed bodies which protrude into the corresponding recesses both in the excavating tooth and the bucket front.
In a preferred embodiment, the cams are semi-spherical, where at least three cams are placed at a suitable radial distance
P20308PC00-DE- 29.09.2003 from the bolt. For reversible excavating teeth, it is preferable that four cams are employed in each excavating tooth.
The protruding length of each cam is adapted such that the cam bottoms in its complementary recess. The excavating tooth surface surrounding the cams thus does not rest on the bucket front.
When the bolt is pre-stressed and the excavating tooth is pulled down towards the bucket front, the material of the excavating tooth surrounding the bolt is also provided with a bending stress. Compared with a bolt connection where the abutment surfaces, also before pre-stressing, rest on each other, the embodiment according to the invention forms a "softer" connection, in that both bolt and the material of the tooth are pre-stressed and are arranged to absorb less changes in distance between the excavating tooth and the bucket front in the longitudinal direction of the bolt.
Due to the definable load pattern which works on the different parts of the excavating tooth securing element, the dimensions of the securing part of the excavating tooth can be reduced relative to excavating teeth according to prior art. An excavating tooth according to the invention has smaller structural dimensions and, at the same time, fitting and replacement work is considerably simplified.
In the following, a non-limiting example of a preferred embodiment is described, and is illustrated in the accompanying drawings, in which:
P20308PC00-DE - 29.09.2003 Figure 1 shows reversible excavating teeth which are mounted to the underneath of the bucket front;
Figure 2 shows a section I-I in figure 1;
Figure 3 shows a section I-I in figure 1, but here the cams are formed by separate bodies;
Figure 4 shows a the front part of the excavating bucket seen from above where adapters and excavating teeth are fitted; and
Figure 5 shows in perspective and partly in section an adapter and a excavating tooth according to figure 4.
On the drawings the reference number 1 represents a reversible excavating tooth which is secured to the bucket front 4 of an excavating bucket 2 by means of a pre-stressed bolt 6 and four cams 8. The bolt 6 is screwed into the corresponding threads 7 in the bucket front 4.
The cams 8 protrude from the surface part 10 of the excavating tooth 1 and faces towards the bucket front 4 and into the corresponding recesses 12 in the bucket front 4. The cams 8 are designed such that they bottom in the recesses 12. The surface part 10 has therefore, both before and. after the bolt 6 is tightened, a clearance to the bucket front 4, and forms therefore, together with a part of the excavating tooth 1, a bolt bridge 11 which is provided with a countersunk through bore 13 for the bolt 6.
P20308PC00-DE - 29.09.2003 The cams 8 in the figures are substantially semi-spherical. It has been shown that this geometry is advantageous in that the half sphere, when it is placed in its respective recess 12, gives a steady anchorage where the connection exhibits a good ability to absorb the occurring forces .
When the bolt 6 is tightened, the bolt 6 is pre-stressed at the same time as the bolt bridge 11 of the excavating tooth 1 is provided with a bending stress. The bending stress arises in that the tensile force of the bolt 6 seeks to displace the surface part 10 around the bolt 6 in towards the bucket front 4, while the cams 8, which bottoms in their recesses 12, form supports for the excavating tooth 1.
This somewhat resilient fixing causes the connection between the excavating tooth 1 and the bucket front 4, compared with prior art, to have a greater possibility to absorb reciprocal distance changes between the excavating tooth 1 and the bucket front 4 in the axial direction of the bolt 6, without the pre-stress of the bolt 6 being reduced to an unwanted degree.
In figure 3 the cams are replaced with bodies 14 which protrude into to the recesses 12 in the bucket front 4 and in to the corresponding recesses 16 in the excavating tooth 1.
In an alternative embodiment, see figure 4, an excavating tooth 18 is connected to a bucket front 20 by means of an adapter 22. The excavating tooth 18 is attached to the adapter 22 by means of a slot and a bolt in a manner known per se.
P20308PC00-DE - 29.09.2003 The adapter 22 is secured to the bucket front 20 in a manner corresponding to that described for the reversible excavating tooth 1, but here three cams 8 and corresponding recesses 12 are employed.
The shape of the cams 8 can take any suitable form where the form causes a bolt bridge 11 to be created, and where the bolt 6 tightens against the bridge between the supports of the bridges. For example, one non-circular cam which encircles the bolt 6 at a radial distance from the bolt 6, can also form a cam according to the invention.
The construction according to the invention, where the cams are designed to absorb forces and moment which work parallel to the surface 10 of the excavating tooth 1, while the bolt 6 absorbs forces which work perpendicular to the surface 10, making it possible for the appearing forces to be transferred to the element which absorbs the forces or components of forces in a significantly more secure way relative to prior art.
Experiments have shown that an excavating tooth 1 which is connected to the bucket front according to the invention, is considerably less prone to loosen during operation than screwed on excavating teeth according to prior art.
P20308PC00-DE - 29.09.2003

Claims

P at ent C laims
1 . Arrangement of a single bolt (4) excavating tooth securing element for employment on the share- or bucket front (4, 20) of earth moving machines, c h a r a c - 5 te r i s ed i n that an excavating tooth ( 1 ) or the adapter (22) for an excavating tooth (1) is attached to the bucket front (4, 20) by means of at least one cam ( 8 ) , where the cam ( 8 ) forms a support for a bolt bridge (11).
o 2 . Arrangement according to claim 1, c h ar ac te r i s ed i n that the cam ( 8 ) is secured to the excavating tooth ( 1 ) and protrudes into and bottoms in a corresponding recess (12) in the bucket front (4).
3. Arrangement according to claim 1, c harac - 5 t eri s ed i n that the cam (8) is secured to the bucket front (4) and protrudes into and bottoms in a corresponding recess (16) in the excavating tooth (1).
4 . Arrangement according to one or more of the preceding claims, c h arac te r i s ed i n that the cam (8) o is formed by a separate body (14) that protrudes into and bottoms in corresponding recesses (12, 16) in the bucket front (4 ) and the excavating tooth ( 1 ) .
5 . Arrangement according to one or more of the preceding claims, c h arac te r i s ed i n that a pre- 5 stressed bolt (6) protrudes through the bolt bridge (11)
P20308PC00-DE - 29.09.2003 and into complementary threads (7) in the bucket front (4).
00-DE - 29.09.2003
EP03751624A 2002-10-02 2003-09-30 Anchoring of a wear element to a bucket front Expired - Lifetime EP1554436B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO20024725A NO318005B1 (en) 2002-10-02 2002-10-02 Facility for single bolt excavator mounting
NO20024725 2002-10-02
PCT/NO2003/000326 WO2004031494A1 (en) 2002-10-02 2003-09-30 Abutment for wear element

Publications (2)

Publication Number Publication Date
EP1554436A1 true EP1554436A1 (en) 2005-07-20
EP1554436B1 EP1554436B1 (en) 2013-03-20

Family

ID=19914054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03751624A Expired - Lifetime EP1554436B1 (en) 2002-10-02 2003-09-30 Anchoring of a wear element to a bucket front

Country Status (4)

Country Link
EP (1) EP1554436B1 (en)
AU (1) AU2003269729B2 (en)
NO (1) NO318005B1 (en)
WO (1) WO2004031494A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1419047A (en) 1921-06-11 1922-06-06 Taylor Wharton Iron & Steel Dipper tooth
CA977007A (en) * 1973-05-29 1975-10-28 Western Rock Bit Company Limited Digger tooth
US4056893A (en) 1976-02-13 1977-11-08 Caterpillar Tractor Co. Eccentric retaining bolt for earthworking tools and method
US4108250A (en) 1976-12-27 1978-08-22 Caterpillar Tractor Co. Cutting edge assembly for earthworking devices
NO171605C (en) * 1991-01-14 1993-04-14 Kvernex As DENT FOR DRAWERS
US5386653A (en) * 1993-06-01 1995-02-07 Caterpillar Inc. Tooth to adapter interface
US5806216A (en) * 1995-09-29 1998-09-15 Caterpillar Inc. Base edge cover for a bucket and apparatus for retaining same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004031494A1 *

Also Published As

Publication number Publication date
NO20024725D0 (en) 2002-10-02
NO318005B1 (en) 2005-01-17
AU2003269729A1 (en) 2004-04-23
EP1554436B1 (en) 2013-03-20
AU2003269729B2 (en) 2006-10-19
WO2004031494A1 (en) 2004-04-15

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