Tooth and adaptor for attachment of the tooth to a working machine

Patent metadata

Field	Value
Publication number	US-10294637-B2
Application number	US-201415307409-A
Country	US
Kind code	B2
Filing date	Apr 29, 2014
Priority date	Apr 28, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A tooth for attachment to the lip of a bucket of a working machine via an adaptor, having a cavity for receiving a portion of the adaptor, the cavity extending between first and second opposed outer working surfaces ( 12, 14 ) from an open end ( 104 ) to a bottom end ( 105 ); the cavity ( 103 ) delimited by an inner wall ( 102 ) having first and second facing inner walls ( 106, 107 ), and opposing side walls ( 108 ), interconnecting the first and second inner walls ( 106, 107 ). The cavity defines a back portion (BP) along the Y axis and between the plane spanned by the X and Z axes and the open end of the cavity, a front portion (FP) along the Y axis and between the plane spanned by the X and Z axes and the bottom end of the cavity; and a stepped portion (SP), interconnecting the back portion and the front portion.

First claim

The invention claimed is:

1. A tooth ( 1 ) for attachment to the lip of a bucket of a working machine via an adaptor,
the tooth having an exterior surface comprising two externally opposed outer working surfaces, namely a first working surface ( 12 ) and a second working surface ( 14 ), the working surfaces ( 12 , 14 ) having a width (W) in a horizontal direction (H), intended to extend along said lip of a bucket, and having a length (L) extending between an attachment end and a tip ( 16 ) of said tooth, the working surfaces ( 12 , 14 ) extending along said length (L) while converging in a vertical direction (V) to be connected at said tip ( 16 ) of the tooth, the tooth ( 1 ) further comprising:
a cavity ( 103 ) for receiving a portion of said adaptor, the cavity ( 103 ) extending between said first and second opposed outer working surfaces ( 12 , 14 ) from an open end ( 104 ), at said attachment end of the tooth, to a bottom end ( 105 ); the cavity ( 103 ) being delimited by inner walls ( 102 );
said inner walls ( 102 ) comprising:
first and second internally facing inner walls ( 106 , 107 ), which define internal surfaces associated with said first outer working surface and said second working outer surface ( 12 , 14 ), respectively; and
opposing side walls ( 108 ), interconnecting said first and second inner walls ( 106 , 107 ),
the opposing side walls ( 108 ) delimiting opposing through holes ( 109 ) for receiving a pin extending through the cavity ( 103 ) for attachment of the tooth ( 1 ) to the adaptor portion;
a first axis X being defined extending through the centres of the opposite through holes ( 109 );
a second axis Y extending along the cavity ( 103 ) from the open end ( 104 ) of the cavity towards the bottom end ( 105 ) of the cavity; and
a third axis Z being orthogonal to said first and second axes X, Y;
the three axes X, Y, Z thereby forming an orthogonal axes system, meeting at an origo, whereby each point of the inner wall ( 102 ) may be defined by Cartesian coordinates (x, y, z);
wherein
the cavity defining:
a back portion (BP) extending along the Y axis, the back portion being at least partially located between the plane spanned by the X and Z axes and the open end ( 104 ) of the cavity,
a front portion (FP) extending along the Y axis, the front portion being located between the plane spanned by the X and Z axes and the bottom end ( 105 ) of the cavity; and
a stepped portion (SP), interconnecting the back portion and the front portion;
in the back portion, the first and second inner walls ( 106 , 107 ), each comprises a pair of essentially planar back contact surfaces ( 130 a, b ; 140 a,b ), each pair of back contact surfaces being symmetrical about, and facing away from, the plane spanned by the Z and Y axes, so as to form an angle (beta, gamma) with the plane spanned by the X and Y axes being less than 35 degrees, each pair of back contact surfaces ( 130 a, b ; 140 a,b ) being separated by a back divider region ( 132 , 142 ), extending beyond the pair of back contact surfaces ( 130 a, b ) in the Z direction away from the XY plane;
in the front portion, the first and second inner wall ( 106 , 107 ) each comprises a pair of essentially planar front contact surfaces ( 110 a,b , 120 a,b ), being symmetrical about the plane spanned by the Z and Y axes;
all contact surfaces forming an angle (alfa) less than 5 degrees with the Y axis, as seen in any plane parallel to the plane spanned by the Z and Y axes;
the front contact surfaces of the first inner wall and/or second inner wall ( 110 a,b ; 120 a,b ) being located closer to the plane spanned by the X and Y axes than the corresponding back contact surfaces ( 130 a,b , 140 a,b ); and
in the stepped portion, the first and/or second inner wall ( 106 , 107 ) forming a slope ( 150 a,b ) wherein at least a portion of the inner wall approaches the XY plane towards the bottom wall ( 105 ), interconnecting said back contact surfaces ( 130 a,b , 140 a,b ) of the first inner wall and/or second inner wall and the corresponding front contact surface ( 110 a,b ; 120 a,b );
wherein a first stepped distance (D1) along the Z axis is bridged by the first inner wall ( 106 ) along the stepped portion (SP), between the first back contact surfaces ( 130 ) and the first front contact surfaces ( 110 ); and
wherein a second stepped distance (D2) along the Z axis is bridged by the second inner wall ( 107 ) along the stepped portion (SP), between the second back contact surfaces ( 140 ) and the second front contact surfaces ( 120 ); wherein 0<=D2<=0.80 D1.

2. A tooth in accordance with claim 1 , wherein each one out of the pair of the back contact surfaces ( 130 a, b ; 140 a, b ) extends at least over a distance along the X axis of 0.2×WI, where WI is the extension of the first or second inner wall ( 106 , 107 ) along the X axis.

3. A tooth in accordance claim 1 , wherein the first and/or second back divider region ( 132 , 142 ) comprises a pair of divider side surfaces ( 134 , 144 ), being symmetrical about, and facing towards, the ZY plane, wherein an extension of the first and/or second back divider region ( 132 , 142 ) in the Z direction away from the XY plane is determined by the extension of the corresponding pair of divider side surfaces ( 134 , 144 ) in said direction.

4. A tooth in accordance with claim 3 , wherein, through a majority of the back portion of the cavity, the extension of the first back divider region ( 132 ) in the Z direction away from the XY plane is greater than the extension of the second back divider region ( 142 ) in the Z direction away from the XY plane.

5. A tooth in accordance with claim 3 , wherein, for the first and/or second back divider region ( 132 , 142 ), each one of the pair of divider side surfaces ( 134 , 144 ) comprises a steeper region ( 134 ′, 144 ′) wherein a tangent to the side surface in the XZ plane forms an angle of more than 45 degrees with the X axis, followed by a flatter region ( 134 ″, 144 ′″) wherein a tangent to the side surface in the XZ plane forms an angle of less than 45 degrees with the X axis, wherein, for the first and/or second back divider region, along a majority of the steeper region's ( 134 ′, 144 ′) length along the X axis, a tangent to the side surface in the XZ plane forms an angle of more than 45 degrees, less than 80 degrees with the X axis towards the Z axis.

6. A tooth in accordance with claim 1 , wherein, in the back portion, the first and/or second inner wall ( 106 , 107 ) displays a contour formed by points (x, z), the contour being symmetrical about the Z axis and having a width WI along the X axis,
the contour being defined by the following: in peripheral portions at abs(x) greater than or equal to 0.9×WI/2, a first maximum abs(z) is defined in a pair of points (x1, z1),
for abs(x) less than abs(x1): abs(z) is diminishing until a minimum abs (z) is defined at (x2, z2),
and
for abs(x) less than abs(x2): abs(z) is increasing until a maximum abs(z) is defined at (x3, z3),
wherein abs(z3)>abs(z1)>abs(z2),
and the pair of contact surfaces ( 130 a,b ; 140 a,b ) of the first and/or second inner walls extends between the points (x1, z1) and (x2, z2), wherein abs(z3)−abs(z1)>0.03×WI, and abs(z3)−abs(z1)<0.6×W.

7. A tooth in accordance with claim 1 , wherein the pair of essentially planar first and/or second front contact surfaces ( 110 a,b , 120 a, b ) face away from the plane spanned by the Z and Y axes, so as to form an angle (delta, epsilon) with the plane spanned by the X and Y axes being less than 35 degrees.

8. A tooth in accordance with claim 7 , wherein, in the front portion, there is at least an interconnected portion wherein at least one of

Assignees

• Metalogenia Research & Tech Sl
• Volvo Constr Equip Ab

Inventors

• Perez Soria Francisco
• Sanchez Guisado Fermin
• Rol Corredor Javier
• Triginer Boixeda Jorge

Classifications

• E02F9/2825 Primary

  using adapters · CPC title

• E02F9/2858 Primary

  characterised by shape · CPC title

• E02F9/2833

  Retaining means, e.g. pins · CPC title

• E02F9/2808 Primary

  Teeth · CPC title

• E02F9/2816

  Mountings therefor · CPC title