Patent Publication Number: US-2022219771-A1

Title: Arrangement of a drive wheel for an endless track of a tracked vehicle

Description:
TECHNICAL FIELD 
     The present invention relates to an arrangement of a drive wheel for an endless track of a tracked vehicle. The present invention also relates to a tracked vehicle comprising drive wheels having such an arrangement. 
     BACKGROUND 
     Tracked vehicles may be equipped with opposite track assemblies. Each track assembly comprises an endless track arranged to run over a set of wheels comprising a drive wheel, a tension wheel and a set of road wheels there between. 
     A drive wheel may be equipped with a hub member and an inner drive sprocket member and an outer drive sprocket member connected to the respective side of the hub member. 
     Wear on drive wheels is relatively large. When using endless tracks of rubber, exchange of drive wheels need to be performed in a workstation, where the each drive sprocket member of the drive wheel needs to be removed. Thus, when the tracked vehicle is not in access of a workstation and there is a need to exchange a drive wheel due to wear on teeth of drive sprocket members a problematic situation may occur. 
     Drive wheels with exchangeable teeth are known, which may facilitate such exchange. 
     There is however a need for providing an arrangement of a drive wheel for an endless track which further facilitates maintenance of the drive wheel. 
     OBJECTS OF THE INVENTION 
     An object of the present invention is to provide an arrangement of a drive wheel for an endless track which further facilitates maintenance of the drive wheel. 
     A further object of the present invention is to provide a vehicle comprising such an arrangement. 
     SUMMARY OF THE INVENTION 
     These and other objects, apparent from the following description, are achieved by an arrangement and a vehicle, as set out in the appended independent claims. Preferred embodiments of the arrangement are defined in appended dependent claims. 
     According to the invention the objects are achieved by a fastening arrangement of a drive wheel for an endless track of a tracked vehicle. The drive wheel comprises a hub member and a drive sprocket member. The drive sprocket member comprises a set of teeth arranged around the circumference of said drive sprocket member. Said teeth are configured to engage with said endless track. Said drive sprocket member further comprises a support member for teeth of said drive sprocket member. Said teeth are configured to be removably attached to said support member. Said fastening arrangement is configured for fastening one or more teeth of the set of teeth to the support member. Said fastening arrangement comprises a set of dovetail shaped recesses of said support member. Each dovetail shaped recess is configured to receive a locking portion of one or more teeth so as to provide a locking function for said one or more teeth. 
     By thus providing a fastening arrangement having such a set of dovetail shaped recesses arranged in the support member and configured to receive a locking portion of one or more teeth, easy and efficient maintenance is facilitated in that teeth may be easily and efficiently exchanged and easily and efficiently locked on the support member. With such dovetail shaped recesses, efficient geometrical locking of teeth is facilitated. 
     According to an embodiment of the fastening arrangement said support member has a front side, wherein the dovetail shaped recess is arranged on the front side of said support member. Hereby is facilitated easy access of the dovetail shaped recess for easy and efficient locking. 
     According to an embodiment of the fastening arrangement said dovetail shaped recess is configured to run radially in said support member. According to an embodiment of the fastening arrangement said dovetail shaped recess is configured to run radially in said support member on the front side of said support member. Hereby easy and efficient locking of teeth to said support member is facilitated. With such dovetail shaped recesses configured to run radially in said support member, efficient geometrical locking of teeth is facilitated in that said teeth will both be pressed towards the flanks and inwardly. 
     According to an embodiment of the fastening arrangement said dovetail shaped recess is configured to narrow in the radial direction from the periphery towards the centre of the support member. With such dovetail shaped recesses configured to run radially in said support member, efficient geometrical locking of teeth is facilitated in that said teeth will both be pressed towards the flanks and inwardly. 
     According to an embodiment of the fastening arrangement said dovetail shaped recess is configured to narrow outwardly from said support member. According to an embodiment of the fastening arrangement said dovetail shaped recess is configured to narrow outwardly from said support member in a direction away from the hub member. With such dovetail shaped recesses configured to run radially in said support member, efficient geometrical locking of teeth is facilitated in that said teeth will both be pressed towards the flanks and inwardly. 
     According to an embodiment of the fastening arrangement said dovetail shaped recess has opposite inner walls and a recess bottom, the dovetail shaped recess being configured to narrow from said recess bottom towards said front side of said support member. 
     According to an embodiment of the fastening arrangement said dovetail shaped recess is arranged to receive a locking portion of one tooth. 
     According to an embodiment of the fastening arrangement said dovetail shaped recess is arranged to receive a locking portion of more than one tooth. 
     According to an embodiment said arrangement further comprises a bolt joint for attaching one or more teeth in association with a dovetail shaped recess. 
     According to an embodiment of the fastening arrangement said dovetail shaped recess is arranged to face away from said hub member. According to an embodiment of the fastening arrangement said front side of the support member with the dovetail shaped recess is arranged to face away from said hub member. 
     According to an embodiment of the fastening arrangement said drive wheel comprises an outer drive sprocket member arranged on the outer side of the hub member and an inner drive sprocket member arranged on the inner side of the hub member. 
     According to the invention the objects are achieved by a drive wheel comprising an arrangement as set out herein. 
     According to the invention the objects are achieved by a vehicle comprising an arrangement as set out herein. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       For a better understanding of the present invention reference is made to the following detailed description when read in conjunction with the accompanying drawings, wherein like reference characters refer to like parts throughout the several views, and in which: 
         FIG. 1  schematically illustrates a side view of a tracked vehicle according to an embodiment of the present disclosure; 
         FIG. 2  schematically illustrates a perspective view of a drive wheel for an endless track of a tracked vehicle according to an embodiment of the present disclosure; 
         FIG. 3  schematically illustrates a side view of the drive wheel in  FIG. 2  according to an embodiment of the present disclosure; 
         FIG. 4  schematically illustrates a front view of a drive sprocket member of a drive wheel for an endless track of a tracked vehicle according to an embodiment of the present disclosure; 
         FIG. 5 a    schematically illustrates a side view of the drive sprocket member in  FIG. 4  according to an embodiment of the present disclosure; 
         FIG. 5 b    schematically illustrates a cross sectional side view of the drive sprocket member in  FIG. 4  according to an embodiment of the present disclosure; 
         FIG. 6 a    schematically illustrates a perspective view of a portion of the drive sprocket member in  FIG. 4  according to an embodiment of the present disclosure; 
         FIG. 6 b    schematically illustrates a perspective view of a portion of the drive sprocket member in  FIG. 4  according to an embodiment of the present disclosure; 
         FIG. 7 a    schematically illustrates a plan view of a tooth of the drive sprocket member in  FIG. 4  according to an embodiment of the present disclosure; 
         FIG. 7 b    schematically illustrates a side view of the tooth in  FIG. 7 a    according to an embodiment of the present disclosure; 
         FIG. 8 a    schematically illustrates a rear view of the tooth in  FIG. 7 a    according to an embodiment of the present disclosure; and 
         FIG. 8 b    schematically illustrates a cross sectional side view of the tooth in  FIG. 7 a    according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Herein the term “rubber” in relation to “rubber track” refers to any elastic material such as rubber, elastomers or combinations of rubber and elastomers. 
     According to an aspect of the present disclosure fastening arrangement of a drive wheel for an endless track of a tracked vehicle is provided. The fastening arrangement is a fastening arrangement for facilitating maintenance of the drive wheel. The fastening arrangement is a fastening arrangement for facilitating exchange and reassembling of teeth of a drive sprocket member of the drive wheel. 
     Such a tracked vehicle may comprise a right track assembly and a left track assembly for driving the vehicle. Such a tracked vehicle may alternatively be a tracked vehicle with a single track assembly. Each track assembly may comprise a drive wheel, a tension wheel, a set of road wheels and an endless track arranged to run over said wheels. The endless track of the respective track assembly may be arranged to be driven and hence rotated by means of said drive wheel. The tracked vehicle may comprise drive means for driving said drive wheels. The drive means may be any suitable drive means such as one or more internal combustion engines and/or one or more electric machines. 
     The endless track of the respective track assembly may have any suitable configuration and be of any suitable material. The endless track of the respective track assembly may according to an aspect of the present disclosure be a rubber track. The endless track of the respective track assembly may according to an aspect of the present disclosure be a steel track. 
     The drive wheel comprises a hub member and a drive sprocket member. The drive sprocket member is attached to the hub member. 
     According to an aspect of the present disclosure said drive wheel comprises an outer drive sprocket member arranged on the outer side of the hub member and an inner drive sprocket member arranged on the inner side of the hub member. 
     According to an aspect of the present disclosure said hub member has a front side or outer side configured to face out from the side of the vehicle and an opposite rear side or inner side configured to face towards the side of the vehicle when the drive wheel is mounted to the vehicle, i.e. mounted to the track assembly of the tracked vehicle. 
     For a tracked vehicle with a single track assembly having a single drive wheel, the drive wheel comprises a hub member and a drive sprocket member attached to the hub member. In this case the drive wheel comprises a first drive sprocket member arranged on one side of the hub member and a second drive sprocket member arranged on the opposite side of the hub member. The hub member hereby has a first side configured to face out from one side of the vehicle and an opposite second side configured to face out from the opposite side of the vehicle, when the drive wheel is mounted to the single track assembly of the vehicle. 
     According to an aspect of the present disclosure said drive wheel may be provided with a single drive sprocket member. The drive wheel according to the present disclosure may according to an aspect of the present disclosure be provided with a single drive sprocket member having teeth arranged around the circumference of said single drive sprocket member and one support member for said teeth. The teeth are configured to be removably attached to the single support member of the drive sprocket member. 
     The drive sprocket member comprises a set of teeth arranged around the circumference of said drive sprocket member. Said teeth are configured to engage with said endless track. Said drive sprocket member further comprises a support member for teeth of said drive sprocket member. Said teeth are configured to be removably attached to said support member. 
     When said drive wheel is arranged at the tracked vehicle a set of the teeth of the drive sprocket member may be engaged with the endless track and another set of the teeth of the drive sprocket member may be at a rotated position of the drive wheel so that they are not engaged with the endless track and may thus be removed and exchanged. The drive wheel may then be rotated to another rotated position of the drive wheel so that another set of the teeth of the drive sprocket member is not engaged with the endless track and may thus be removed and exchanged. 
     Said fastening arrangement is configured for fastening one or more teeth of the set of teeth to the support member. Said fastening arrangement comprises a set of dovetail shaped recesses of said support member. Each dovetail shaped recess is configured to receive a locking portion of one or more teeth so as to provide a locking function for said one or more teeth. Each dovetail shaped recess is configured to receive a locking portion of one or more teeth so as to provide efficient geometrical locking of teeth is. 
     According to an aspect of the present disclosure said support member has a front side, wherein the dovetail shaped recess is arranged on the front side of said support member. By thus arranging the dovetail shaped recess on the front side, easy access for easy fastening of one or more teeth is provided. According to an aspect of the present disclosure said dovetail shaped recess is configured to run radially in said support member. According to an aspect of the present disclosure said dovetail shaped recess is configured to run radially in said support member on the front side of said support member. According to an aspect of the present disclosure said dovetail shaped recess is configured to run radially in said support member so that, when said locking portion of one or more teeth is lockingly arranged in the dovetail shaped recess, said teeth will both be pressed towards the flanks and inwardly of the dovetail shaped recess for efficient geometrical locking of teeth. 
     According to an aspect of the present disclosure said dovetail shaped recess is configured to narrow in the radial direction from the periphery towards the centre of the support member. According to an aspect of the present disclosure said dovetail shaped recess is configured to narrow in the radial direction from the periphery towards the centre of the support member so that, when said locking portion of one or more teeth is lockingly arranged in the dovetail shaped recess, said teeth will both be pressed towards the flanks and inwardly of the dovetail shaped recess for efficient geometrical locking of teeth. 
     According to an aspect of the present disclosure said dovetail shaped recess is configured to narrow outwardly from said support member. According to an aspect of the present disclosure said dovetail shaped recess is configured to narrow outwardly from said support member so that, when said locking portion of one or more teeth is lockingly arranged in the dovetail shaped recess, said teeth will both be pressed towards the flanks and inwardly of the dovetail shaped recess for efficient geometrical locking of teeth. 
     Herein the term “the dovetail shaped recess is configured to narrow outwardly from said support member” may refer to the dovetail shaped recess narrowing in the direction away from the hub member, when the support member is mounted to the hub member. According to an aspect of the present disclosure said dovetail shaped recess is configured to narrow outwardly from said support member in a direction away from the hub member. A drive wheel may have an outer drive sprocket member arranged on the outer side of the hub member and an inner drive sprocket member arranged on the inner side of the hub member. For such a drive wheel, a dovetail shaped recess of the outer drive sprocket member is configured to narrow in the direction away from the hub member, i.e. outwardly from said support member, and a dovetail shaped recess of the inner drive sprocket member is configured to narrow in the direction away from the hub member, i.e. outwardly from said support member. 
     According to an aspect of the present disclosure said support member has a front side and an opposite rear side. The front side of the support member is configured to face away from the hub member and the rear side is configured to face towards the hub member when attached to the hub member. According to an aspect of the present disclosure said support member of the respective drive sprocket member has a front side and an opposite rear side. According to an aspect of the present disclosure front side of the support member of the outer drive sprocket member is configured to face away from the front side of the hub member when attached to the hub member and the front side of the support member of the inner drive sprocket member is configured to face away from the rear side of the hub member when attached to the hub member. 
     According to an aspect of the present disclosure said support member has a ring shaped configuration. According to an aspect of the present disclosure said support member has a wheel shaped configuration. According to an aspect of the present disclosure said support member has an outer cylindrical configuration with a radius greater than the height. According to an aspect of the present disclosure said support member has a ring shaped configuration with an outer side configured to face said endless wheel when said drive wheel is attached to the track assembly of the tracked vehicle. According to an aspect of the present disclosure said support member has a ring shaped configuration with an outer circumference and a centre. According to an aspect of the present disclosure said support member has a ring shaped configuration with a periphery and a centre. The centre of the support member may correspond to the axil centre of the drive wheel. 
     Herein the term “the dovetail shaped recess is configured to narrow outwardly from said support member” may refer to the dovetail shaped recess narrowing in the direction away from the hub member, said direction away from the hub member corresponding to a direction essentially parallel to the centre axis of the drive wheel. 
     According to an aspect of the present disclosure said dovetail shaped recess is configured so that, when said locking portion of one or more teeth is lockingly arranged in the dovetail shaped recess, said teeth will both be pressed towards the flanks and inwardly of the dovetail shaped recess for efficient geometrical locking of teeth is. 
     According to an aspect of the present disclosure said dovetail shaped recess has opposite inner walls configured to run from the outer side of the support member along the front side towards a central portion of the support member. According to an aspect of the present disclosure the inner walls are configured to run towards each other from the outer side towards a central area of the support member and are thus narrowing each other. According to an aspect of the present disclosure the respective inner wall of said recess has an inclination relative to the direction perpendicular to the radial direction of the support member such that the inner walls are leaning towards each other. According to an aspect of the present disclosure said dovetail shaped recess has a recess bottom. According to an aspect of the present disclosure the dovetail shaped recess is configured to narrow from said recess bottom towards said front side of said support member. 
     According to an aspect of the present disclosure said dovetail shaped recess has opposite inner walls and a recess bottom, the dovetail shaped recess being configured to narrow from said recess bottom towards said front side of said support member. Hereby efficient geometrical locking of teeth is facilitated. 
     The locking portion has opposite outer walls configured to run from the outer side along the front side towards a central portion of the support member. The opposite outer walls are configured to face the inner walls of the dovetail shaped recess when a tooth is attached to the support member. The locking portion has an outer side configured to face in the same direction as the outer side of the support member when a tooth is attached to the support member. 
     The locking portion has an inner side, opposite to said outer side, configured to face towards an inner end of the dovetail shaped recess of the support member when the tooth is attached to the support member. 
     According to an aspect of the present disclosure said dovetail shaped recess is arranged to receive a locking portion of one tooth. 
     According to an aspect of the present disclosure said dovetail shaped recess is arranged to receive a locking portion of more than one tooth. 
     According to an aspect of the present disclosure said fastening arrangement further comprises a bolt joint for attaching one or more teeth in association with a dovetail shaped recess. 
     According to an aspect of the present disclosure said dovetail shaped recess is arranged to face away from said hub member. 
     According to an aspect of the present disclosure said front side of the support member is arranged to face away from said hub member. 
     According to an aspect of the present disclosure said front side of the support member with the dovetail shaped recess is arranged to face away from said hub member. 
       FIG. 1  schematically illustrates a side view of a tracked vehicle V according to an embodiment of the present disclosure. 
     The vehicle V is according to the disclosure in  FIG. 1  a military vehicle. 
     The tracked vehicle V comprises a vehicle body B, which according to an aspect of the present disclosure comprises the chassis of the vehicle V and bodywork. 
     The tracked vehicle V comprises a right track assembly T 1  and a left track assembly for driving the vehicle V, the right track assembly T 1  being shown in  FIG. 1 . Each track assembly comprises a drive wheel DW, a tension wheel TW, a set of road wheels RW and an endless track E arranged to run over said wheels. Here the drive wheel DW is arranged in the front, the tension wheel TW is arranged in the back and the road wheels RW are arranged between the drive wheel DW and the tension wheel TW. The tracked vehicle according to the present disclosure may however have track assemblies with any suitable arrangement of drive wheel, tension wheel and road wheels. According to an aspect of the present disclosure the tension wheel may be arranged in the front, the drive wheel arranged in the back and the road wheels arranged there between. 
     The endless track E of the respective track assembly is arranged to be driven and hence rotated by means of said drive wheel DW. The tracked vehicle V comprises a drive means, not shown, for driving said drive wheels DW. The drive means may be any suitable drive means such as an internal combustion engine and/or an electric machine. 
     The endless track of the respective track assembly may have any suitable configuration and be of any suitable material. The endless track E of the respective track assembly may, according to an aspect of the present disclosure, be a rubber track. The endless track of the respective track assembly may, according to an aspect of the present disclosure, be a steel track. 
       FIG. 2  schematically illustrates a perspective view of a drive wheel DW for an endless track of a tracked vehicle according to an embodiment of the present disclosure; and  FIG. 3  schematically illustrates a side view of the drive wheel DW in  FIG. 2  according to an embodiment of the present disclosure. 
     The drive wheel DW has a centre axis Z. The drive wheel DW comprises a hub member H. The hub member H is configured to be operably engaged with the drive axle of the drive means of the tracked vehicle and configured to be rotated by the drive means. The hub member H is thus arranged to rotate about the centre axis Z, see  FIGS. 2 and 3 . 
     The hub member H has according to this embodiment spokes. The hub member according to the present disclosure may have any suitable configuration. The drive means may according to an aspect of the present disclosure, not shown, be arranged in connection to the drive wheel such that the drive means, e.g. an electric machine, at least partly is accommodated within the periphery of the drive wheel, the drive means axle essentially coaxially coinciding with the centre axis Z of the drive wheel. 
     The hub member H has a first side H 1  and an opposite second side H 2 . The hub member H has a front side H 1  and an opposite rear side H 2 , see  FIG. 3 . The front side H 1  is configured to face out from the vehicle and the rear side H 2  is configured to face towards the vehicle, when the drive wheel DW is mounted to the vehicle. The front side H 1  is thus facing out from the side of the vehicle, i.e. in the transversal direction of the vehicle, when the drive wheel DW is mounted to the vehicle. The rear side H 2  is thus facing towards the vehicle in the transversal direction of the vehicle, when the drive wheel DW is mounted to the vehicle. The front side H 1  of the hub member may be denoted outer side H 1  of the hub member H since it faces outwardly from the vehicle in the lateral direction of the vehicle. The rear side H 2  of the hub member may be denoted inner side H 2  of the hub member H since it faces inwardly in the lateral direction of the vehicle. 
     According to an embodiment of the present disclosure said drive wheel DW comprises an outer drive sprocket member S 1  arranged on the front side H 1  of the hub member H and an inner drive sprocket member S 2  arranged on the rear side H 2  of the hub member H. 
     The respective drive sprocket member S 1 , S 2  comprises a set of teeth  10  arranged around the circumference of said drive sprocket member S 1 , S 2 . According to this embodiment, the outer drive sprocket member S 1  comprises a set of teeth  10  arranged around the circumference of said outer drive sprocket member S 1 . According to this embodiment, the inner drive sprocket member S 2  comprises a set of teeth  10  arranged around the circumference of said inner drive sprocket member S 2 . 
     Said teeth are 10 configured to engage with an endless track of the tracked vehicle. 
     The respective drive sprocket member S 1 , S 2  comprises a support member  20  for teeth of said drive sprocket member S 1 , S 2 . According to this embodiment, the outer drive sprocket member S 1  comprises a support member for teeth  10  of said outer drive sprocket member S 1 . According to this embodiment, the inner drive sprocket member S 2  comprises a support member for teeth  10  of said inner drive sprocket member S 2 . 
     Said teeth  10  are configured to be removably attached to said support member  20 . 
     The support member  20  of the respective drive sprocket member S 1 , S 2  has, according to the embodiment in  FIGS. 2 and 3 , a ring shaped configuration. The support member  20  of the respective drive sprocket member S 1 , S 2  has an outer side  20   a  and an opposite inner side  20   b.    
     The support member  20  of the respective drive sprocket member S 1 , S 2  has a front side  20   c  and an opposite rear side  20   d.    
     The front side  20   c  of the support member  20  of the outer drive sprocket member S 1  is configured to face away from the front side H 1  of the hub member H when attached to the hub member H. The front side  20   c  of the support member  20  of the inner drive sprocket member S 2  is configured to face away from the rear side H 2  of the hub member H when attached to the hub member H. 
     The rear side  20   d  of the support member  20  of the outer drive sprocket member S 1  is configured to face towards the front side H 1  of the hub member H when attached to the hub member H. The rear side  20   d  of the support member  20  of the inner drive sprocket member S 2  is configured to face towards the rear side H 2  of the hub member H when attached to the hub member H. 
     Said teeth  10 , when arranged on and distributed around the support member  20  of the respective drive sprocket member S 1 , S 2 , are configured to protrude from said outer side  20   a  so as to engage with said endless track. 
     Said teeth  10 , when arranged on and distributed around the support member  20  of the respective drive sprocket member S 1 , S 2 , are configured to project from said front side  20   c.    
     The drive wheel according to the present disclosure may according to an aspect of the present disclosure, not shown, be provided with a single drive sprocket member. The drive wheel according to the present disclosure may according to an aspect of the present disclosure be provided with a single drive sprocket member, not shown, having teeth arranged around the circumference of said single drive sprocket member and one support member for said teeth. The teeth are configured to be removably attached to the single support member of the drive sprocket member, not shown. 
     The drive wheel DW comprises a fastening arrangement A for facilitating fastening one or more teeth  10  of the set of teeth  10  to the support member  20 . The drive wheel DW comprises a fastening arrangement A for facilitating fastening one or more teeth  10  of the set of teeth  10  to the respective support member  20 . 
     Said fastening arrangement A is configured for fastening one or more teeth  10  of the set of teeth  10  to the support member  20 . Said fastening arrangement A comprises a set of dovetail shaped recesses  22  of said support member  20 . Said support member  20  is thus provided with dovetail shaped recesses  22 . According to this embodiment of the present disclosure, the support member  20  of the outer drive sprocket member S 1  comprises a set of dovetail shaped recesses  22  circumferentially arranged around its support member  20 . According to this embodiment of the present disclosure, the support member  20  of the inner drive sprocket member S 2  comprises a set of dovetail shaped recesses  22  circumferentially arranged around its support member  20 . 
     Each dovetail shaped recess  22  is configured to receive a locking portion  12  of one or more teeth  10  so as to provide a locking function for said one or more teeth  10 . 
     The set of dovetail shaped recesses  22  are arranged on the front side  20   c  of the support member  20  of the respective drive sprocket member S 1 , S 2 . 
     According to an aspect of the present disclosure the fastening arrangement A further comprises a bolt joint J 1  for attaching one or more teeth  10  in association with a dovetail shaped recess  22  of the support member  20  of the respective drive sprocket member S 1 , S 2 . 
     According to an aspect of the present disclosure the fastening arrangement A comprises a set of attachment members  24  arranged around the side of the respective ring shaped support member  20  in connection to said dovetail shaped recesses  22 , see  FIG. 2  showing the set of attachment members  24  for the inner drive sprocket member S 2 . The each attachment member  24  is according to this embodiment arranged in connection to a dovetail shaped recess  22 . The respective attachment member  24  is arranged to receive a bolt joint J 1  for attaching the respective tooth  10  to the support member  20 . 
     According to this embodiment the respective drive sprocket member S 1 , S 2  comprises a set of fastening members  26  arranged around the inner side  20   b  of the respective ring shaped support member  20 , see  FIG. 2  showing the set of fastening members  26  for the inner drive sprocket member S 2 . The respective fastening member  26  comprises or is arranged to receive a bolt joint J 2  for attaching the respective drive sprocket member S 1 , S 2  to the hub member H of the drive wheel DW. According to this embodiment the fastening members  26  are attached to spokes of the hub member H. 
     The outer drive sprocket member S 1  and hence the fastening arrangement A is described in more detail below, with reference to  FIGS. 4, 5   a  and  5   b.    
       FIG. 4  schematically illustrates a front view of a drive sprocket member S 1  of a drive wheel for an endless track of a tracked vehicle according to an embodiment of the present disclosure;  FIG. 5 a    schematically illustrates a side view of the drive sprocket member S 1  in  FIG. 4  according to an embodiment of the present disclosure; and  FIG. 5 b    schematically illustrates a cross sectional side view A-A of the drive sprocket member S 1  in  FIG. 4  according to an embodiment of the present disclosure. 
     The drive wheel comprising such a sprocket member S 1  may be a drive wheel according to the drive wheel DW in  FIG. 1 . The drive wheel comprising such a sprocket member S 1  may be a drive wheel according to the drive wheel DW in  FIGS. 2 and 3 . 
       FIG. 6 a    schematically illustrates a perspective view of a portion of the drive sprocket member S 1  in  FIG. 4  according to an embodiment of the present disclosure; and  FIG. 6 b    schematically illustrates a perspective view of a portion of the drive sprocket member S 1  in  FIG. 4  according to an embodiment of the present disclosure. 
     The drive sprocket member S 1  has a centre axis Z about which the drive sprocket member is intended to rotate during drive of the vehicle. 
     The drive sprocket member S 1  is according to an aspect of the present disclosure an outer drive sprocket member S 1  of a drive wheel, e.g. the drive wheel DW in  FIG. 2-3 , comprising an inner drive sprocket member arranged on the inner side of a hub member of the drive wheel and an outer drive sprocket member arranged on the outer side of the hub member. 
     The drive sprocket member S 1  comprises a set of teeth  10  arranged around the circumference of said drive sprocket member S 1 . 
     The drive sprocket member S 1  comprises a support member  20  for teeth  10  of said drive sprocket member S 1 . 
     The support member  20  has according to an aspect of the present disclosure a ring shaped configuration. The support member  20  has an outer side  20   a  providing an outer surface configured to face the endless track of the track assembly of the vehicle when the drive wheel is mounted to the tracked vehicle. 
     The teeth  10 , when arranged on and distributed around the support member  20 , are configured to project from said outer side  20   a . Thus, a portion  11  of said teeth  10  is configured to project from said outer side  20   a  so as to engage with said endless track. 
     The teeth  10 , when arranged on and distributed around the support member  20 , have an outer side  10   a  providing an outer surface configured to face the endless track of the track assembly of the vehicle when the drive wheel is mounted to the tracked vehicle. The outer side  10   a  of said teeth  10  correspond to a surface portion of said portion  11  of said teeth. Said surface portion and hence outer side  10   a  of said teeth is configured to engage with said endless track. 
     The teeth  10 , when arranged on and distributed around the support member  20 , have an inner side  10   b  configured to face towards the axis Z of the drive wheel, and hence the drive sprocket member S 1 . 
     The support member  20  according to an aspect of the present disclosure has an inner side  20   b  opposite to said outer side  20   a . The support member  20  according to an aspect of the present disclosure has a front side  20   c  and an opposite rear side  20   d.    
     The dovetail shaped recess  22  is arranged on the front side  20   c  of said support member  20 . 
     The teeth  10  are configured to be removably attached to said support member  20 . 
     The drive sprocket member S 1  comprises a fastening arrangement A for facilitating fastening one or more teeth  10  of the set of teeth  10  to the support member  20 . The drive sprocket member S 1  comprises a fastening arrangement A for facilitating fastening one or more teeth  10  of the set of teeth  10  to the respective support member  20 . 
     Said fastening arrangement A is configured for fastening one or more teeth  10  of the set of teeth  10  to the support member  20 . Said fastening arrangement A comprises a set of dovetail shaped recesses  22  of said support member  20 . Said support member  20  is thus provided with dovetail shaped recesses  22 . 
     Each dovetail shaped recess  22  is configured to receive a locking portion  12  of one or more teeth  10  so as to provide a locking function for said one or more teeth  10 . According to this embodiment, each dovetail shaped recess  22  is configured to receive a locking portion  12  of one tooth  10  so as to provide a locking function for said one or more teeth  10 . According to this embodiment, each tooth  10  comprises a locking portion  12  configured to lockingly fit in said dovetail shaped recess  22 . 
     An embodiment of a tooth  10  of the set of teeth  10  of the drive sprocket member S 1  is described in more detail with reference to  FIGS. 7 a - b  and 8 a - b   . The locking portion  12  of a tooth  10  of the set of teeth  10  of the drive sprocket member S 1  is described in more detail with reference to  FIGS. 7 a - b  and 8 a   - b.    
     According to an aspect of the present disclosure the fastening arrangement A further comprises a bolt joint J 1  for attaching one or more teeth  10  in association with a dovetail shaped recess  22 . 
     The set of dovetail shaped recesses  22  are arranged on the front side  20   c  of the support member  20 . Each dovetail shaped recess  22  is configured to run radially in said support member  20 . Each dovetail shaped recess  22  is configured to run radially on the front side  20   c  of said support member  20 . 
     Said dovetail shaped recess  22  is configured to narrow in the radial direction from the periphery towards the centre of the support member  20 . Said dovetail shaped recess  22  is configured to narrow in the radial direction from the periphery of the support member  20  towards the centre, i.e. the central point of the support member associated with the centre axis of the sprocket member S 1 , of the support member  20 . Said dovetail shaped recess  22  is configured to narrow in the radial direction from the outer side  20   a  of the support member  20  towards the centre of the support member  20 . 
     Said dovetail shaped recess  22  has opposite inner walls  22   a ,  22   b . Said opposite inner walls  22   a ,  22   b  constitutes a first inner wall  22   a  and an opposite second inner wall  22   b . The inner walls  22   a ,  22   b  are configured to run from the outer side  20   a  along the front side  20   c  towards a central portion of the support member  20 . The inner walls  22   a ,  22   b  are configured to run towards each other from the outer side towards a central area of the support member  20  and are thus narrowing each other. 
     The inner walls  22   a ,  22   b  are configured to run from the front side  20   c  towards a recess bottom  22   c . The recess bottom  22   c  is thus running from the outer side  20   a  along the front side  20   c  towards a central portion of the support member  20 . The dovetail shaped recess  22  thus has inner walls  22   a ,  22   b  and a recess bottom  22   c . The dovetail shaped recess  22  has an inner end  22   d  at a certain distance from the inner side  20   b  of the support member  20 , see FIG.  4 . The inner end  22   d  of the respective dovetail shaped recess  22  is according to this embodiment arranged in connection to the attachment member  24 . 
     As illustrated in  FIG. 6 b   , the respective inner wall  22   a ,  22   b  of said recess  22  has an inclination α relative to the direction perpendicular to the radial direction of the support member  20 . The respective inner wall  22   a ,  22   b  of said recess  22  has an inclination α relative to the direction parallel to the axial direction of the support member  20 . The inclination α of the respective inner wall  22   a ,  22   b  is such that the inner walls  22   a ,  22   b  are leaning towards each other. 
     Said dovetail shaped recess  22  is thus configured to narrow outwardly from said support member  20 . Said dovetail shaped recess  22  is thus configured to narrow towards said front side  20   c  of said support member  20 . Said dovetail shaped recess  22  is thus configured to narrow from said recess bottom  22   c  towards said front side  20   c  of said support member  20 . 
     According to the embodiment illustrated in e.g.  FIG. 4  and  FIG. 5 a - b    each tooth  10  is configured to be attached to the support member  20  in connection to a dovetail shaped recess  22 . According to the embodiment illustrated in e.g.  FIG. 4  and  FIG. 5 a - b    each tooth  10  comprises an opening O 1 , i.e. a through hole, for receiving a bolt joint J 1 . The opening O 1  is arranged in connection to the locking portion  12  of the respective teeth  10 . 
     According to an aspect of the present disclosure the fastening arrangement A comprises a set of attachment members  24  arranged around the side of the respective ring shaped support member  20  in connection to said dovetail shaped recesses  22 , see  FIG. 4 . Each attachment member  24  is according to this embodiment arranged in connection to a dovetail shaped recess  22 . The respective attachment member  24  is arranged to receive a bolt joint J 1  for attaching the respective tooth  10  to the support member  20 . 
     According to this embodiment the drive sprocket member S 1  comprises a set of fastening members  26  arranged around the inner side  20   b  of the ring shaped support member  20 . The respective fastening member  26  comprises or is arranged to receive a bolt joint J 2  for attaching the drive sprocket member S 1  to the hub member of the drive wheel, see  FIG. 4 . 
       FIG. 7 a    schematically illustrates a plan view of a tooth  10  of the drive sprocket member S 1  in  FIGS. 2 and 4  according to an embodiment of the present disclosure;  FIG. 7 b    schematically illustrates a side view of the tooth  10  in  FIG. 7 a    according to an embodiment of the present disclosure;  FIG. 8 a    schematically illustrates a rear view of the tooth  10  in  FIG. 7 a    according to an embodiment of the present disclosure; and  FIG. 8 b    schematically illustrates a cross sectional side view of the tooth  10  in  FIG. 8 a    according to an embodiment of the present disclosure. 
     Said tooth  10  has an outer side  10   a  providing an outer surface configured to face the endless track of the track assembly of the vehicle when the tooth  10  is attached to the support member and the drive wheel is mounted to the tracked vehicle, see  FIG. 7 b   . Said tooth  10  has an inner side  10   b  opposite to said outer side  10   a , see  FIG. 7   b.    
     Said tooth  10  has front side  10   c  configured to project from the front side of the support member when the tooth  10  is attached to the support member, see  FIG. 7 a - b   . Said tooth  10  has rear side  10   d  opposite to said front side  10   c , said rear side being configured to face the front side of the support member when the tooth  10  is attached to the support member, see  FIG. 7 a   - b.    
     The tooth  10 , when arranged on and distributed around the support member  20 , is configured to project from the outer side  20   a  of the support member  20  with a portion  11  of said tooth  10  so as to engage with said endless track, see e.g.  FIG. 4 . The outer side  10   a  of said teeth  10  correspond to a surface portion of said portion  11  of said tooth  10 . 
     Said tooth  10  has a first long side  10   e  configured to run from the front side  10   c  towards the rear side  10   d , see  FIG. 7 a   . Said tooth  10  has a second long side  10   f , opposite to said first long side  10   e , configured to run from the front side  10   c  towards the rear side  10   d , see  FIG. 7   a.    
     Said tooth  10  has a locking portion  12 . The locking portion  12  is shaped to fit into a dovetail shaped recess  22  of the support member  20 , see e.g.  FIG. 7 a   - b.    
     Said tooth  10  has a wing element  14  arranged in the rear portion of the tooth  10 . The locking portion  12  is configured to project rearwardly from the wing portion  14 . The wing element  14  comprises a first wing portion  14   a . The first long side  10   e  is configured to transcend into said first wing portion  14   a . The wing element  14  comprises a second wing portion  14   b  opposite to the first wing portion  14   a . The second long side  10   f  is configured to transcend into said second wing portion  14   b.    
     The locking portion  12  has opposite outer walls  12   a ,  12   b . Said opposite outer walls  12   a ,  12   b  constitutes a first outer wall  12   a  and an opposite second outer wall  12   b . The outer walls  12   a ,  12   b  are configured to face the inner walls  22   a ,  22   b  of the dovetail shaped recess  22  when the tooth  10  is attached to the support member  20 . The outer walls  12   a ,  12   b  are configured to run from the outer side  10   a  along the front side  20   c  towards a central portion of the support member  20 . 
     The locking portion  12  has an outer side  12   c  configured to face in the same direction as the outer side  20   a  of the support member  20  when the tooth  10  is attached to the support member  20 . 
     The locking portion  12  has an inner side  12   d , opposite to said outer side  12   c , configured to face towards the inner end  22   d  of the dovetail shaped recess  22  of the support member  20  when the tooth  10  is attached to the support member  20 . 
     The outer walls  12   a ,  12   b  are configured to run towards each other from the outer side towards a central area of the support member  20  and are thus narrowing each other from the outer side  12   c  towards the inner side  12   d.    
     The rear side  10   d  of the tooth constitutes the surface side  12   e  of the locking portion  12  configured to face the recess bottom  22   c  of the dovetail shaped recess  22  of the support member, see e.g.  FIG. 7 a - b    and  FIG. 6   a.    
     According to an aspect of the present disclosure, the locking portion  12  thus has opposite outer walls  12   a ,  12   b  configured to face and at least partly engage with the opposite inner walls  22   a ,  22   b  of the dovetail shaped recess  22 , and a surface side  12   e  configured to face and at least partly engage with the recess bottom  22   c  of the dovetail shaped recess  22 , providing efficient geometrical locking. 
     The foregoing description of the preferred embodiments of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to understand the invention for various embodiments and with the various modifications suited to the particular use contemplated.