Patent Application
20200378090
The present disclosure generally pertains to ground engaging tools. More particularly this application is directed toward a retainer sleeve.
Earth-working machines, such as, for example, excavators, wheel loaders, hydraulic mining shovels, cable shovels, bucket wheels, bulldozers, and draglines, are generally used for digging or ripping into the earth or rock and/or moving loosened work material from one place to another at a worksite. These earth-working machines include various earth-working implements, such as a bucket or a blade, for excavating or moving the work material. These implements can be subjected to extreme wear from the abrasion and impacts experienced during the earth-working applications.
To protect these implements against wear, and thereby prolong the useful life of the implements, various ground engaging tools, such as teeth, edge protectors, and other wear members, can be provided to the earth-working implements in the areas where the most damaging abrasions and impacts occur. These ground engaging tools are removably attached to the implements using customized retainer systems, so that worn or damaged ground engaging tools can be readily removed and replaced with new ground engaging tools.
Many retainer systems have been proposed and used for removably attaching various ground engaging tools to earth-working implements. One example of such retainer system is described in U.S. Pat. No. 9,309,651 to Jeske et al. The disclosed retainer system includes a retainer bushing for use with a lock in a ground engaging tool. The retainer bushing may include a skirt extending around a retainer axis, where the skirt may include an outer surface configured to mate with a lock cavity of the ground engaging tool and an inner surface configured to rotatably receive an outer surface of the lock. The retainer bushing may also include a detent projection extending radially inward from the inner surface with respect to the retainer axis and configured to engage a detent recess of the lock to releasably hold the lock. The detent projection may include a convex surface with a substantially constant radius, and a center of the radius of the convex surface may be positioned at a first distance from the retainer axis that is greater than a second distance between the retainer axis and the outer surface of the skirt.
The present disclosure is directed toward overcoming one or more of the problems discovered by the inventors.
A retention sleeve for use with a lock in a ground engaging tool is disclosed herein. The retention sleeve includes an outer skirt. The outer skirt circumferentially extending around a retainer axis. The outer skirt includes an upper portion, a middle bend extending outward from the upper portion with respect to the retainer axis, and a lower portion extending inward from the middle bend with respect to the retainer axis, disposed opposite from the upper bend. The retention sleeve additionally includes a lower bend extending inward from a portion of the lower portion with respect to the retainer axis. The retention sleeve further includes an inner skirt extending partially from the lower bend and circumferentially around the retainer axis, disposed radially inward to the outer skirt with respect to retainer axis.
The details of embodiments of the present disclosure, both as to their structure and operation, may be gleaned in part by study of the accompanying drawings, in which like reference numerals refer to like parts, and in which:
The detailed description set forth below, in connection with the accompanying drawings, is intended as a description of various embodiments and is not intended to represent the only embodiments in which the disclosure may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the embodiments. However, it will be apparent that those skilled in the art will be able to understand the disclosure without these specific details. In some instances, well-known structures and components are shown in simplified form for brevity of description. Some of the surfaces have been left out or exaggerated for clarity and ease of explanation
Adapter 20 may include a pair of first and second mounting legs 26, 28 defining a recess 27 there between for receiving base edge 5. Adapter 20 may be secured in place on base edge 5 by attaching first mounting leg 26 and second mounting leg 28 to base edge 5 using any suitable connection method. For example, mounting legs 26 and 28 and base edge 5 may have corresponding apertures (not shown) through which any suitable fasteners such as bolts or rivets may be inserted to hold adapter 20 in place. Alternatively or additionally, mounting legs 26 and 28 may be welded to the corresponding top and bottom surfaces of base edge 5. Any other connection method and/or configuration known in the art may be used alternatively or additionally. For example, in some exemplary embodiments, an adapter 20 may be configured to use any of the retainer systems 50 disclosed herein to secure the adapter 20 to a ground engaging tip 30.
The adapter 20 may include a nose 21 extending in a forward direction. Nose 21 may be configured to be received in a mounting cavity 35 (shown in
Nose 21 may include an integral post 23 extending from each lateral side 22, 24. Post 23 may have various shapes and sizes. In one exemplary embodiment, as shown in
For example, looking back at
Referring to
Lock 60 may also include a head portion 80 attached to lock skirt 63 adjacent an end of lock skirt 63. The head portion 80 may include a wall 82 extending in a plane that can be substantially perpendicular to lock rotation axis 65 and across the end of lock skirt 63 adjacent the head portion 80. The head portion can include a projection 86 extending from wall 82 away from lock skirt 63 along lock rotation axis 65. Projection 86 may include a substantially cylindrical outer surface 87 extending around most of lock rotation axis 65 and a tab 88 extending radially outward relative to lock rotation axis 65.
Lock 60 may also include a tool interface 84 in head portion 80 to facilitate rotating lock 60 about lock rotation axis 65. Tool interface 84 may include any type of features formed to be engaged by a tool for applying torque to lock 60 about lock rotation axis 65. For example, tool interface 84 may include a socket recess with a cross-section formed to engage a socket driver, such as a socket wrench. When lock 60 is seated within lock cavity 40, head portion 80 defining tool interface 84 may extend at least partially through lock cavity 40 and lock bulges 45, and lock cavity 40 may provide an access opening for a tool to engage tool interface 84.
In some embodiments, wall 82 may fully enclose the side of lock slot 62 adjacent the head portion 80. The side of head portion 80 opposite lock slot 62 may include a projection 86 extending from wall 82 away from lock skirt 63 along lock rotation axis 65. In some exemplary embodiments, tab 88 may extend transverse relative to the direction that lock slot 62 extends from open end 69 to closed end 68.
Referring back to
Referring to
The retainer sleeve 70 can have a lower bend 71 extending inward from the bottom edge 96 of the outer skirt 73. The lower bend 71 can be disposed along bottom edge 96, between the outer skirt ends 95. The outer skirt 73 can circumferentially extend from the lower bend 71 partially around the retainer axis 75. In other words the outer skirt 73 can circumferentially cantilever from the lower bend 71 with respect to the retainer axis 75. The arc length of the lower bend 71 can be less than a fourth of the arc length of the outer skirt 73 and can be proportional to the outer skirt 73 perimeter. The lower bend 71 can extend inward and upwards from the bottom edge 96. The lower bend 71 can be formed to position the inner skirt 74. The inner skirt 74 can circumferentially extend from the lower bend 71 with respect to the retainer axis 75. In other words the inner skirt 74 can circumferentially cantilever from the lower bend 71 with respect to the retainer axis 75. The lower bend 71 can bend at a constant radius. Alternatively, the lower bend 71 may have multiple curvatures which can facilitate the positioning of the inner skirt 74. The lower bend 71 can be disposed radially between the outer skirt 73 and inner skirt 74 with respect to the retainer axis 75.
The bottom edge 96 can include outer skirt recesses 78 disposed adjacent to the connection between the lower bend 71 and the outer skirt 73.
The inner skirt 74 can extend between an inner top edge 99 and an inner bottom edge 98. The inner bottom edge 98 can be disposed opposite from the inner top edge 99. The inner bottom edge 98 and inner top edge 99 can be flat, so that they are substantially perpendicular to the retainer axis 75 and parallel to each other. The inner skirt 74 can be flexibly joined to the outer skirt 73 by the lower bend 71. The inner skirt 74 is disposed inward of the outer skirt 73. The inner skirt 74 can extend generally parallel with the retainer axis 75. The inner skirt 74 can cantilever from the lower bend 71 and extend around the retainer axis 75. The inner skirt 74 can extend upwards from the lower bend 71 and may be in the form of a continuous “C” shape that extends around a retainer axis 75. The inner skirt 74 may extend approximately the same angular degree around retainer axis 75 as outer surface 66 of lock 60 extends around lock rotation axis 65. The perimeter of the inner skirt 74 can be longer than the lower bend 71 and shorter than the perimeter of the outer skirt 73. The lower bend 71 can extend inward from a portion of the bottom edge 96 to a portion of the inner bottom edge 98 with respect to the retainer axis 75.
The inner bottom edge 98 can include inner skirt recesses 92 disposed adjacent to the connection between the lower bend 71 and the inner skirt 74.
In some exemplary embodiments, retainer sleeve 70 may include one or more detents for engaging corresponding detents of lock 60. For example, as shown in
Detent projections 77 may have various shapes. In one exemplary embodiment, each detent projection 77 may include a generally convex curved surface, such as a multi-curvature surface, jutting radially inward from inner skirt 74. The convex curved surface of the detent projection 77 may curve back towards the outer skirt 73 and transition to a linear portion extending toward the outer skirt 73. The detent projections 77 can maintain their shape and size along a direction generally parallel to retainer axis 75.
The inner skirt 74 can include one or more flanges (two are shown and are labeled 72) that extend inward from the inner top edge 99 towards the retainer axis 75. The flange 72 can have multiple curvatures. The flange 72 can be disposed proximate to the detent projection 77. The flange can be disposed along the radial extension of the inner skirt 74 between the detent projections 77. Multiple flanges 72 may be located at various positions on inner skirt 74. The flange can be formed to receive the lock skirt 63 of the lock 60.
The inner top edge 99 can include flange recesses 91 disposed adjacent to the connection between the flange 72 and the inner skirt 74.
Referring to
Lock cavity 40 may be formed such that, when retainer sleeve 70 is seated in lock cavity 40, rotation of retainer sleeve 70 with respect to lock rotation axis 65 is substantially prevented. For example, as shown in
As mentioned above, lock 60 may be formed to mate with inner skirt 74 of retainer sleeve 70. For example, as shown in
Referring to
Lock 60 may include one or more detent recesses 67 formed to engage corresponding detent projections 77 of retainer sleeve 70 to releasably hold lock 60 in predetermined rotational positions about lock rotation axis 65. For example, as shown in
According to one exemplary embodiment, retainer sleeve 70 may be constructed of self-lubricating material that may either exude or shed lubricating substance. For example, retainer sleeve 70 may be made of thermoplastic material comprising polyoxymethylene (POM), also known as Delrin®. In a further example, the retainer sleeve 70 may be made of metal such as steel. Retainer sleeve 70 made of such material may exhibit low friction while maintaining dimensional stability.
Lock 60 may be constructed of metal. Alternatively or additionally, all or a portion of the surface of lock 60 may be coated with a friction-reducing material. The term “friction-reducing material,” as used herein, refers to a material that renders the surface of lock 60 to have a friction coefficient ranging from approximately 0.16 to approximately 0.7. For example, at least a portion of the surface of lock 60 may be plated with zinc to reduce friction on the surface of lock 60 (e.g., surface between lock 60 and retainer sleeve 70) to a friction coefficient between approximately 0.16 to approximately 0.7.
In another exemplary embodiment, at least a portion of the surface of lock 60 may be coated with graphite powder. The graphite powder may be aerosolized and sprayed directly onto the surface of lock 60. Alternatively or additionally, the graphite powder may be mixed with a suitable solvent material and applied to the surface of lock 60 by using a brush or dipping the lock 60 into the mixture. In one exemplary embodiment, a commercially available graphite lubricant, such as the products sold under trademark SLIP Plate, may be used alternatively or additionally.
As mentioned above, lock 60 may be installed with retainer sleeve 70 in lock cavity 40 with outer surface 66 of lock 60 mated to inner skirt 74 of retainer sleeve 70 and detent recesses 67 of lock 60 mated to detent projections 77 of retainer sleeve 70. When lock 60 is disposed in this position, open end 69 of lock slot 62 may face rearward, as shown in
To lock post 23 inside lock slot 62, lock 60 may be rotated with respect to lock rotation axis 65 to a locked position. In this locked position, the portion of lock skirt 63 adjacent closed end 68 may preclude sliding movement of post 23 relative to lock slot 62, thereby preventing sliding movement of tip 30 relative to adapter 20. The locked position of lock 60 may be approximately 180 degrees from the unlocked position about lock rotation axis 65. In the locked position, as in the unlocked position, detent recesses 67 of lock 60 may engage detent projections 77 of retainer sleeve 70, which may releasably hold lock 60 in the locked position.
To rotate lock 60 between the unlocked position and the locked position, sufficient torque may be applied to lock 60 with respect to lock rotation axis 65 to cause detent projections 77 and/or detent recesses 67 to deflect and disengage from one another. Once detent projections 77 and detent recesses 67 are disengaged from one another, outer surface 66 of lock skirt 63 of lock 60 may slide along inner skirt 74 of retainer sleeve 70 as lock 60 rotates around lock rotation axis 65. Once lock 60 rotates approximately 180 degrees around lock rotation axis 65, detent projections 77 and detent recesses 67 may reengage one another to releasably hold lock 60 in that rotational position.
Lock 60 may also include a tool interface 84 in head portion 80 to facilitate rotating lock 60 about lock rotation axis 65. Tool interface 84 may include any type of features formed to be engaged by a tool for applying torque to lock 60 about lock rotation axis 65. For example, as shown in
Ground engaging tools and the associated retainer systems of the present disclosure are not limited to the exemplary configurations described above. For example, ground engaging tool 10 may include a different number of lock cavities 40, and ground engaging tool 10 may employ a different number and configuration of posts 23, locks 60, and retainer sleeves 70. Additionally, in lieu of adapter 20 and posts 23, ground engaging tool 10 may employ one or more pins fixed to or integrally formed with suitable support structure.
The disclosed retainer systems and ground engaging tools may be applicable to various earth-working machines, such as, for example, excavators, wheel loaders, hydraulic mining shovels, cable shovels, bucket wheels, bulldozers, and draglines. When installed, the disclosed retainer systems and ground engaging tools may protect various implements associated with the earth-working machines against wear in the areas where the most damaging abrasions and impacts occur and, thereby, prolong the useful life of the implements.
The disclosed configurations of various retainer systems and components may provide secure and reliable attachment and detachment of ground engaging tools to various earth-working implements. In particular, certain configurations of the disclosed retainer systems may address certain issues associated with work material getting into the space around the retainer system and increasing friction between components of the retainer system and/or between retainer system and a ground engaging tool. Moreover, certain configurations of the disclosed retainer systems may reduce friction between components of a retainer system and/or between a component of a retainer system and a ground engaging tool.
The disclosed retainer system 50 includes lock 60 and retainer sleeve 70. The outer skirt of the retainer sleeve 70 is formed to mate with inner surface 43 of lock cavity 40 of tip 30, and lock 60 is formed to mate with inner skirt 74 of retainer sleeve 70. To attach tip 30 to adapter 20, lock 60 and retainer sleeve 70 are assembled into lock cavity 40 of tip 30. Lock cavity 40 opens into side slot 41 that extends rearward, which allows passage of post 23 of adapter 20. Once post 23 is inserted inside lock slot 62, lock 60 is rotated about lock rotation axis 65 to a closed position. In this position, the portion of lock skirt 63 adjacent closed end 68 may preclude sliding frustoconical portion of post 23 into or out of lock slot 62, preventing sliding movement of tip 30 relative to adapter 20. In the locked position, detent recesses 67 of lock 60 may engage detent projections 77 of retainer sleeve 70, which may releasably hold lock 60 in the locked position.
To detach tip 30 from adapter 20, lock 60 is rotated from the locked position to an unlocked position to cause detent projections 77 and detent recesses 67 to disengage from one another. Once detent projections 77 and detent recesses 67 are disengaged from one another, outer surface 66 of lock skirt 63 of lock 60 may slide along inner skirt 74 of retainer sleeve 70, as lock 60 rotates around lock rotation axis 65. Once lock 60 rotates approximately 180 degrees around lock rotation axis 65, detent projections 77 and detent recesses 67 may reengage one another to releasably hold lock 60 in that rotational position.
The lower bend 71 is formed to flexibly connect the outer skirt 73 to the inner skirt 74. The lower bend 71 is formed to allow the outer skirt 73 and inner skirt 74 to flex along the lower bend 71 independently of each other, like a hinge point, to accommodate variances in the lock 60 and lock cavity 40 dimensions.
During manufacturing, the lock cavity 40 and the lock 60 can be made slightly larger or smaller in comparison to the design dimensions. In a least material condition (LMC) of the lock cavity 40, the outer skirt 73 can be pre-formed in anticipation for a LMC and can provide a tight fit with the inner surface 43 of the lock cavity 40. In a maximum material condition (MMC) of the lock cavity 40, the outer skirt 73 can flex, independently from the inner skirt 74, towards the inner skirt 74 and the retainer axis 75 to accommodate a tighter fit. The tight fit keeps the lock 60 and the retainer sleeve 70 concentric and in the proper position.
Similarly, in a least material condition (LMC) of the lock 60, the inner skirt 74 can be pre-formed in anticipation for a LMC and can provide a tight fit with the outer surface 66 of the lock skirt 63. In a maximum material condition (MMC) of the lock 60, the inner skirt 74 can flex, independently from the outer skirt 73, toward the outer skirt 73 and away from the retainer axis 75 to accommodate a tighter fit and can prevent the lock 60 from rotating to an unlocked position.
The independent flexibility of the outer skirt 73 and the inner skirt 74 allows the retainer sleeve 70 to accommodate for the LMC and MMC in both the lock cavity 40 and lock 60 as well as lock cavities 40 and locks 60 that are sized to design dimensions.
The outer skirt recess 79 and inner skirt recess 92 can be shaped to provide relief from the lower bend 71 and can release some of the internal stress between the lower bend 71 and the inner skit 74 and outer skirt 73. The flange recess 91 can be shaped to provide relief from the inner skirt 74 and can release some of the internal stress between the flange 72 and inner skirt 74.
The flange 72 can be shaped to hold the retainer 70 from moving along the retainer axis 75 when installed with the lock 60 in the lock cavity 40.
Although this invention has been shown and described with respect to detailed embodiments and examples thereof, it will be understood by those skilled in the art that various changes in form and detail thereof may be made without departing from the spirit and scope of the claimed invention. Accordingly, the preceding detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. In particular, the described embodiments are not limited to use in conjunction with a particular type of earth-working machines. Furthermore, there is no intention to be bound by any theory presented in any preceding section. It is also understood that the illustrations may include exaggerated dimensions and graphical representation to better illustrate the referenced items shown, and are not consider limiting unless expressly stated as such.
It will be understood that the benefits and advantages described above may relate to one embodiment or may relate to several embodiments. It is appreciated that features shown or discussed in one embodiment or example can be combined with other features shown or discussed in other embodiments and examples. The embodiments are not limited to those that solve any or all of the stated problems or those that have any or all of the stated benefits and advantages.
