A guard for a crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing with a flange bolted to the frame and a sprocket hub rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housing
A guard for a crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing with a flange bolted to the frame and a sprocket hub rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housing and hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, the guard being adapted to be assembled radially outward of the mechanical shield, the guard having a circular shell member for bolting to an inside face of the sprocket hub and extending axially in one piece across substantially all of the distance between the spindle flange and the sprocket hub, the guard shell having an internal circumferential groove, a circular radial flange for mounting in the space between the spindle flange and the sprocket hub, the guard shell being diametrally split whereby it can be radially assembled around the spindle flange with the radial flange closely fitting within the groove to form a stepped gap for excluding debris including strand material from a zone within the guard shell.
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1. A guard for a crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing with a flange bolted to the frame and a sprocket hub rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housi
1. A guard for a crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing with a flange bolted to the frame and a sprocket hub rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housing and hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, the guard being adapted to be assembled radially outward of the mechanical shield, the guard having a circular shell member for bolting to an inside face of the sprocket hub and extending axially in one piece across substantially all of the distance between the spindle flange and the sprocket hub, the guard shell having an internal circumferential groove, a circular radial flange for mounting on the spindle flange in the space between the spindle flange and the sprocket hub, the guard shell being diametrally split whereby it can be radially assembled around the spindle flange with the radial flange closely fitting within the groove to form a stepped gap for excluding debris including strand material from a zone within the guard shell. 2. A guard as set forth in claim 1, wherein the shell member can be bolted to the sprocket hub with bolts serving to mount a carrier on an outboard side of the sprocket hub. 3. A guard as set forth in claim 2, wherein said shell member is provided with internally threaded receiving holes for said mounting bolts. 4. A guard as set forth in claim 3, wherein the shell member has a wall thickness greater than the bolt diameter and said wall provides said receiving holes. 5. A guard as defined in claim 1, wherein said groove is generally U-shaped in cross-section whereby said radial flange is surrounded by said guard shell for sealing in two opposed radial directions. 6. A guard for crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing with a flange bolted to the frame and a sprocket hub rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housing and sprocket hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, the guard being adapted to be assembled radially outward of the mechanical shield, the guard having a circular shell for bolting on an inner side of the sprocket hub with bolts in a circle shared by bolts mounting a carrier on an outer side of the sprocket hub and extending axially in one piece between the spindle flange and the sprocket hub, the guard shell having an internal circumferential groove, the guard having a circular radial flange on the spindle housing in the space between the spindle flange and the sprocket hub, the guard shell adjacent an end distal from the sprocket hub being smaller in diameter than a diameter of the circular radial flange and being diametrally split whereby it can be radially assembled around the circular radial flange with the circular radial flange closely fitting within the groove to form a stepped gap for excluding debris including strand material from a zone within the circular guard shell. 7. A guard as set forth in claim 6, wherein the guard shell can be bolted to the sprocket hub with bolts serving to mount the carrier on the outer side of the sprocket hub. 8. A guard for crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing with a flange bolted to the frame and a sprocket hub rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housing and sprocket hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, the guard being adapted to be assembled radially outward of the mechanical shield, the guard having a circular shell member for bolting on an inner side of the sprocket hub and extending axially in one piece between the spindle flange and the sprocket hub, whereby said circular shell member of said guard rotates with said sprocket hub and is exposed to the external debris environment, said circular shell member of the guard having an inwardly facing rotating first stepped gap forming structure, an outwardly facing second stepped gap forming structure fixed on said spindle housing and free of any radial interference with said first stepped gap forming structure so said first stepped gap forming structure can be moved freely in a radially outward direction with respect to said second stepped gap forming structure, a portion of said circular shell member on a side of said second stepped gap forming structure distal from said sprocket hub being smaller in diameter than a maximum diameter of said second stepped gap forming structure, said first and second stepped gap forming structures co-acting to create an annular stepped gap for excluding debris as said circular shell member rotates around said spindle housing, said annular debris excluding gap being exposed to the external debris environment and being displaced from said small gap, said guard circular shell member being diametrally split into two semi-circular sections whereby the circular shell member can be radially disassembled from around said second stepped gap structure without disturbing said second stepped gap forming structure. 9. A guard as defined in claim 8, wherein said annular debris excluding stepped gap is displaced radially from said small gap. 10. A guard as defined in claim 9, wherein said rotating first stepped gap forming structure is a groove on said circular shell member which is annular when said shell is assembled over said second stepped gap forming structure and said second stepped gap forming structure includes a radially outwardly extending circular flange fixed on said spindle housing, which circular flange extends into said annular groove when said shell is assembled over said second stepped gap forming structure. 11. A guard as defined in claim 10, wherein said groove is U-shaped to form two generally parallel, radially extending portions of said debris excluding gap when said circular shell member is assembled over said second stepped gap forming structure. 12. A guard as defined in claim 9, wherein said groove is U-shaped to form two generally parallel, radially extending portions of said debris excluding gap when said circular shell member is assembled over said second stepped gap forming structure. 13. A guard as defined in claim 8, wherein said groove is U-shaped to form two generally parallel, radially extending portions of said debris excluding gap when said circular shell member is assembled over said second stepped gap forming structure. 14. A guard for crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing with a flange bolted to the frame and a sprocket hub rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housing and sprocket hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, the guard being adapted to be assembled radially outward of the mechanical shield, the guard having a circular shell member for bolting to the sprocket hub with bolts in a circle shared by bolts mounting a carrier on an outer side of the sprocket hub and extending axially in one piece between the spindle flange and the sprocket hub, the guard shell member having an internal circumferential groove, the guard having a circular radial flange fixed on the spindle housing in the space between the spindle flange and the sprocket hub, the guard shell adjacent an end distal from the sprocket hub being smaller in diameter than a diameter of the circular radial flange and being diametrally split whereby it can be radially assembled around the circular radial flange with the circular radial flange closely fitting within the groove to form a stepped gap for excluding debris including strand material from a zone within the guard shell member. 15. A guard for crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing bolted to the frame and a sprocket hub with an outer periphery rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housing and sprocket hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, the guard being adapted to be assembled radially outward of the mechanical shield, the guard having a circular shell member for bolting to the sprocket hub and extending axially in one piece between the frame and the sprocket hub, the guard shell member having a main outer annular surface radially closer to said outer periphery of the sprocket hub than to the seal, the guard shell member having a wall element adjacent an end distal from the sprocket hub extending radially inward to an inner diameter thereof, a circular radially outwardly extending ring element in the guard shell member fixed on the spindle housing, the radially outwardly extending ring element having an outer diameter larger than the inner diameter of the radially inwardly extending wall element, the guard shell member being diametrally split whereby it can be assembled between the spindle housing and sprocket hub while the sprocket hub remains assembled with the spindle housing and without disturbing said ring element, the wall element and ring element forming a stepped gap to mutually exclude debris including strand material by avoiding a straight axial line path from outside the guard to an interior of the guard shell member. 16. A guard as defined in claim 15, wherein said stepped gap is generally U-shaped. 17. A guard for crawler type land vehicles having a frame, a final drive on each side of the frame, the final drive including a spindle housing bolted to the frame and a sprocket hub rotationally supported on the spindle housing, a track sprocket on the sprocket hub, the spindle housing and sprocket hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, the guard being adapted to be assembled radially outward of the mechanical shield, the guard having a circular shell member for bolting to the sprocket hub and extending axially in one piece between the frame and the sprocket hub, the guard shell member having a wall element extending radially inward to an inner diameter thereof, a circular radially outwardly extending ring element in the shell member fixed on the spindle housing axially between the guard shell member wall element and the sprocket hub, the radially outwardly extending ring element having an outer diameter larger than the inner diameter of the radially inwardly extending wall element, the guard shell member being diametrally split whereby it can be assembled between the frame and sprocket hub while the sprocket hub remains assembled with the spindle housing, the wall element and ring element forming a stepped gap to mutually exclude debris including strand material by avoiding a straight axial line path from outside the guard to an interior of the guard shell member, the stepped gap being remote from the sprocket hub and axially fully offset from the small gap. 18. A guard as defined in claim 17, wherein said stepped gap is generally U-shaped. 19. A guard as defined in claim 17, wherein said offset of said stepped gap from said small gap is in the axial direction of said spindle. 20. In combination, a crawler type land vehicle having a frame, a final drive on each side of the frame, the final drive including a spindle housing bolted to the frame, a sprocket hub rotationally supported on the spindle housing, and a carrier on an outboard side of the sprocket hub, a track sprocket on the sprocket hub, the spindle housing and sprocket hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, a guard assembled radially outward of the mechanical shield, the guard having a circular shell member on an inner side of the sprocket hub and extending axially between the frame and the sprocket hub, whereby said circular shell member rotates with said sprocket hub and is exposed to the external debris environment, said circular shell member having an inwardly facing rotating first stepped gap forming structure, an outwardly facing second stepped gap forming structure fixed on said spindle housing, said first and second stepped gap forming structures co-acting to create an annular stepped gap for excluding debris as said circular shell member rotates around said spindle housing, said debris excluding gap being exposed to the external debris environment and being displaced from said small gap, said circular shell member being diametrally split into two semi-circular sections whereby the circular shell member can be radially disassembled from around said outwardly facing second stepped gap structure without disturbing said second stepped gap forming structure, the circular shell member, sprocket hub and carrier having alignable holes in a circular pattern, one of the circular shell member, sprocket hub, and carrier being internally threaded at a respective alignable hole set common among the circular shell member, sprocket hub and carrier and two of the circular shell member, sprocket hub and carrier being free of internal threads at their respective holes of the hole set, the circular shell member and carrier being retained on said sprocket hub by threaded bolts assembled in said alignable holes. 21. In combination, a crawler type land vehicle having a frame, a final drive on each side of the frame, the final drive including a spindle housing bolted to the frame, a sprocket hub rotationally supported on the spindle housing, and a carrier on an outboard side of the sprocket hub, a track sprocket on the sprocket hub, the spindle housing and sprocket hub establishing a small gap to form a mechanical shield to protect a rotational seal within the space enclosed by the spindle housing and sprocket hub, a guard assembled radially outward of the mechanical shield, the guard having a circular shell member on an inner side of the sprocket hub and extending axially between the frame and the sprocket hub, whereby said circular shell member rotates with said sprocket hub and is exposed to the external debris environment, said circular shell member having an inwardly facing rotating first stepped gap forming structure, an outwardly facing second stepped gap forming structure fixed on said spindle housing, said first and second stepped gap forming structures co-acting to create an annular stepped gap for excluding debris as said circular shell member rotates around said spindle housing, said debris excluding gap being exposed to the external debris environment and being displaced from said small gap, said circular shell member being diametrally split into two semi-circular sections whereby the circular shell member can be radially disassembled from around said outwardly facing second stepped gap structure without disturbing said second stepped gap forming structure, the circular shell member being retained on the inner side of the sprocket hub with threaded bolts in receiving holes in the sprocket hub adjacent an outer circumference of the carrier.
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이 특허에 인용된 특허 (20)
Knell Harvey A. ; O'Brien Eric R., Apparatus and method of preventing refuse from wrapping around the axle of a work machine.
McCartney Robert Anthony,GB2 ; McCartney Neil John,GB2, Apparatus for inhibiting wire, cable and the like from entangling the axle assembly of a wheeled vehicle.
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