Patent Application
20150259875
The present disclosure is directed to a machine bucket, and more particularly, to a machine bucket having a shallow profile.
A machine, such as an excavator, may be equipped with a bucket to perform operations at a work site. Such operations may include, for example, penetrating material in the ground or in a pile to prepare building sites, loading material into trucks or onto conveyors, making cuts through hillsides, digging trenches, and cleaning ditches. The level of performance achieved by an operator using the excavator may depend, at least partially, on one or more parameters of the bucket. Using one particular bucket may provide a level of performance that significantly differs from the level achieved while performing similar operations using a different bucket that has one or more different parameters.
An exemplary machine bucket is disclosed in International Patent Application Publication No. WO 2012113542 to Raaz that published on Aug. 30, 2012 (the '542 publication). Specifically, the '542 publication describes a digging tool for excavators including a sloped, lower back region, a sloped, upper back region, and a concave, middle back region extending between the lower and upper back regions. To prevent material from sticking to inner surfaces of the tool, a radius of the middle back region of the tool increases continuously from the lower back region to the upper back region.
Although the digging tool of the '542 publication may be adequate for some applications, it may still be less than optimal. In particular, because the radius of the middle back region of the tool in the '542 publication increases from its lower back region to its upper back region, a deeper bucket profile is created, which may be less suitable for quick dumping applications. Also, having an increased radius at an upper region of the digging tool of the '542 publication may produce bulkiness and create visibility problems for the operator.
The machine bucket of the present disclosure solves one or more of the problems set forth above and/or other problems of the prior art.
In one aspect, the present disclosure is directed to a machine bucket. The machine bucket may include a torque tube having an outer surface. The machine bucket may also include a support plate coupled to the torque tube. The support plate may include a bottom surface. The machine bucket may further include a base edge including a cutting edge. The machine bucket may also include a curved wrapper located between the support plate and the base edge. A ratio of a maximum distance between the curved wrapper and a first line extending from the base edge to the outer surface of the torque tube where the bottom surface of the support plate intersects the outer surface of the torque tube, taken substantially perpendicularly from the first line, relative to a length of the first line, may be about 0.61 to 0.63.
In another aspect, the present disclosure is directed to a machine bucket. The machine bucket may include a wrapper forming a portion of a receptacle for holding material. The wrapper may include a curved upper portion having a first radius of curvature, and a curved lower portion having a second radius of curvature that differs from the first radius of curvature. A ratio of the first radius of curvature to the second radius of curvature may be about 0.39 to 0.49.
In yet another aspect, the present disclosure is directed to a machine bucket. The machine bucket may include a top section. The top section may include a support plate, and a torque tube coupled to the support plate. The machine bucket may also include a bottom section including a base edge, and a middle section including a wrapper. The wrapper may extend between the torque tube and the base edge. The wrapper may include an upper portion coupled to the support plate, a lower portion coupled to the base edge, and a curved heel between the upper portion and the lower portion. An angle between the upper portion and the lower portion may be about 350. Further, a ratio of a maximum distance between the wrapper and a first line extending from the base edge to the outer surface of the torque tube where the support plate intersects the torque tube, taken substantially perpendicularly from the first line, relative to a length of the first line, may be about 0.61 to 0.63.
As shown in
Middle section 14 may include a wrapper 40 having a first end 41, a substantially flat upper portion 42 coupled to support plate 18, a substantially flat lower portion 44, a second end 47, and a curved heel 46 extending between the upper and lower portions 42 and 44. Lower portion 44 may be coupled to a base edge 30 of bottom section 16. For example, base edge 30 may be welded to second end 47 of wrapper 40. Base edge 30 may be configured to engage and penetrate material. Bottom section 16 may also include one or more ground engaging tools 32. Ground engaging tools 32 may be coupled to base edge 30, and each ground engaging tool 32 may include, for example, at least one cutting edge 34. It is contemplated that, in other embodiments, ground engaging tool 32 may include shrouds, teeth (adapters), top covers, half arrow segments, or any other tools, if desired.
Bucket 10 may also include a first side 48 (shown in
A number of bucket parameters are identified in
As shown in
Edge forward angle θ1 may be an angle formed between an edge forward line 60 and a line 62. Edge forward line 60 may extend from a center of upper pin bore 26 to the edge of bottom section 16, such as the forward most point of base edge 30. Line 62 may extend substantially perpendicularly from lower portion 44 of wrapper 40 and through the center of upper pin bore 26. It should be noted that the term “plane” may be substituted for the term “line” with respect to any of the lines used to define the parameters of bucket 10.
A first throat line 64 may extend between a forward most point of base edge 30 and an outer surface of torque tube 20. The position of first throat line 64 may be found by drawing a line that extends from the forward most point of base edge 30 to torque tube 20, the line being generally tangential to an outer surface of torque tube 20 and terminating at the tangent point. Length L may be a length of first throat line 64. Depth D may be a length of the longest line extending generally perpendicularly from first throat line 64 to wrapper 40.
A second throat line 66 may extend between the forward most point of base edge 30 and a portion of torque tube 20. This portion of torque tube 20 may be a point at which a line defining a lower surface of support plate 18 intersects an outer surface of torque tube 20. Length L′ may be a length of second throat line 66. Depth D′ may be a length of the longest line extending generally perpendicularly from second throat line 66 to wrapper 40.
As shown in
A first end 88 of upper portion 42 may coincide with first end 41 of wrapper 40. A second end 90 of upper portion 42 may coincide with first end 96 of upper portion 70. Second end 90 of upper portion 42 (and first end 96 of upper portion 70) may be located at a point along wrapper 40 where wrapper 40 begins to have substantial curvature when moving from first end 41 to second end 47 of wrapper 40. It should be understood that upper portion 42 may be slightly curved and/or have one or more slightly curved regions. These curved regions may have greater curvature than the entirely flat region, but less curvature than any region of curved heel 46. As a result, these curved regions may provide a smooth transition from upper portion 42 to curved heel 46. For example, upper portion 42 may include a slightly curved region proximate its second end 90 where upper portion 42 transitions into upper portion 70. In this region, the radius of curvature of upper portion 42 may decrease when moving toward upper portion 70.
A first end 92 of lower portion 44 may generally coincide with second end 47 of wrapper 40. A second end 94 of lower portion 44 may coincide with first end 100 of lower portion 68. Second end 94 of lower portion 44 (and first end 100 of lower portion 68) may be located at a point along wrapper 40 where wrapper 40 begins to have substantial curvature when moving from second end 47 to first end 41 of wrapper 40. It should be understood that lower portion 44 may be slightly curved and/or have one or more slightly curved regions. These curved regions may have greater curvature than the entirely flat region, but less curvature than any region of curved heel 46. As a result, these curved regions may provide a smooth transition from curved heel 46 to lower portion 44. For example, lower portion 44 may include a slightly curved region proximate its second end 94 where lower portion 44 transitions into lower portion 68. In this region, the radius of curvature of lower portion 44 may decrease when moving toward lower portion 68.
Second ends 98 and 102 of upper portion 70 and lower portion 68 may generally coincide. Upper portion 70 may have a radius of curvature approximating upper wrapper radius R2. Lower portion 68 may have a radius of curvature approximating lower wrapper radius R1. First end 96 of upper portion 70 may be located at the first point on wrapper 40 where wrapper 40 has the radius of curvature approximating upper wrapper radius R2, when moving from first end 41 to second end 47 of wrapper 40. First end 100 of lower portion 68 may be located at the first point on wrapper 40 where wrapper 40 has the radius of curvature approximating lower wrapper radius R1, when moving from second end 47 to first end 41 of wrapper 40. Second end 98 of upper portion 70 (and second end 102 of lower portion 68) may be located at the point on wrapper 40 where the radius of curvature of wrapper 40 changes from approximating upper wrapper radius R2 to approximating lower wrapper radius R1.
It should be understood that the radius of curvature of upper portion 70 and/or lower portion 68 may vary slightly. For example, the radius of curvature of upper portion 70 may be a first value in one region of upper portion 70, and a second value, that is slightly different from the first value in another region of upper portion 70. Similarly, it is also contemplated that the radius of curvature of lower portion 68 may have a first value in one region of lower portion 68, and a second value that is slightly different from the first value in another region of lower portion 68. For example, upper portion 70 may include a transition region proximate its second end 98, where upper portion 70 transitions into lower portion 68, and lower portion 68 may include a transition region proximate its second end 102 where lower portion 68 transitions into upper portion 70. In the transition region of upper portion 70, the radius of curvature of upper portion 70 may increase in the direction of lower portion 68. In the transition region of lower portion 68, the radius of curvature of lower portion 68 may decrease in the direction of upper portion 70.
Referring to
Side bar angle θ2 is shown in
In a first example, bucket 10 may have an edge radius RE of approximately 1,020 mm, an edge forward angle θ1 of approximately 31°, a depth D of approximately 541 mm, a length L of approximately 949 mm, a ratio of D/L of approximately 0.570, a depth D′ of approximately 532 mm, a length L′ of approximately 860 mm, a ratio of D′/L′ of approximately 0.618, a lower wrapper radius R1 of approximately 325 mm, an upper wrapper radius R2 of approximately 150 mm, a radius ratio of R2/R1 of approximately 0.46, an upper radius angle θU of approximately 49°, a lower radius angle θL of approximately 96°, a hinge support plate angle θT of approximately 35°, and a side bar angle θ2 of approximately 48°.
In a second example, bucket 10 may have an edge radius RE of approximately 1,190 mm, an edge forward angle θ1 of approximately 31°, a depth D of approximately 611 mm, a length L of approximately 1,077 mm, a ratio of D/L of approximately 0.567, a depth D′ of approximately 601 mm, a length L′ of approximately 961 mm, a ratio of D′/L′ of approximately 0.625, a lower wrapper radius R1 of approximately 380 mm, an upper wrapper radius R2 of approximately 150 mm, a radius ratio of R2/R1 of approximately 0.39, an upper radius angle θU of approximately 51°, a lower radius angle θL of approximately 94°, a hinge support plate angle θT of approximately 35°, and a side bar angle θ2 of approximately 48°.
In a third example, bucket 10 may have an edge radius RE of approximately 1,214 mm, an edge forward angle θ1 of approximately 31°, a depth D of approximately 637 mm, a length L of approximately 1,130 mm, a ratio of D/L of approximately 0.564, a depth D′ of approximately 626 mm, a length L′ of approximately 1,012 mm, a ratio of D′/L′ of approximately 0.618, a lower wrapper radius R1 of approximately 390 mm, an upper wrapper radius R2 of approximately 190 mm, a radius ratio of R2/R1 of approximately 0.49, an upper radius angle θU of approximately 53°, a lower radius angle θL of approximately 92°, a hinge support plate angle θT of approximately 35°, and a side bar angle θ2 of approximately 48°.
As will be described in more detail below, examples of bucket 10 described above may possess performance enhancing geometries. Differences between the examples demonstrate that some variability of the values for bucket parameters is contemplated. For example, values may vary depending on the desired overall size of bucket 10, and/or parameters associated with the linkage assembly used to coupled bucket 10 to a machine.
The performance enhancing characteristics of a bucket 10 may come as a result of the values of its parameters. For example, the disclosed ratio of D′/L′ may be about 0.61 to 0.63. This ratio may provide a shallow profile of bucket 10, thereby improving the ease by which material exits from bucket 10. In addition, this ratio may help to prevent material from sticking to surfaces of bucket 10.
If a bucket has a ratio of D′/L′ that exceeds the desired range, material may stick to surfaces of the bucket, thus reducing a volume of the bucket in subsequent earth moving operations. In addition, a bucket that has a ratio of D′/L′ that exceeds the desired range may make the bucket more difficult to load and unload. Further, if the ratio of D′/L′exceeds the desired range, the material entering into the bucket must travel across a greater distance before reaching the back of the bucket during filling, and must also travel back across that greater distance during dumping. The added travel time for material entering into and exiting out of the bucket may increase cycle times.
If a bucket has a value for the ratio of D′/L′ that falls below the desired range, the bucket may be loaded and unloaded too quickly, and be lacking in terms of capacity. For example, less material may be dumped and loaded for each pass with the bucket. By keeping the value for the ratio of D′/L′ in desired range of 0.61 and 0.63, a balance between ease of loading and dumping and bucket capacity may exist for bucket 10, thus helping to avoid the inefficiencies described above.
The disclosed radius ratio of R2/R1 may be about 0.39 to 0.49. This ratio may help to ensure that bucket 10 has a shape with the above-described shallow profile that improves the ease of dumping and filling of bucket 10, and helps to prevent material from sticking to inner surfaces of bucket 10.
The disclosed edge forward angle value θ1 may be about 31°. This edge forward angle θ1 value may provide a machine operator with line of sight to a forward most point of a bottom section 16 of bucket 10, such as a forward most point of base edge 30 of bucket 10. As the machine operator moves material with bucket 10, this line of sight may provide the machine operator with the ability to move and place bucket 10 accurately. Thus, unnecessary bucket movements may be avoided. Accordingly, operations may be performed more quickly, and the amount of material moved per unit of fuel may be increased, producing cost savings.
Further, the disclosed edge forward angle θ1 may provide the machine operator with line of sight into at least a portion of a receptacle 56 of bucket 10. This may provide the machine operator with the ability to visually determine, during filling, whether bucket 10 is fully filled with material or has additional capacity for material. Thus, the machine operator may avoid wasting time trying to fill a full bucket with additional material or performing operations with only partially filled buckets.
The disclosed hinge support plate angle θT may be about 35°. This hinge support plate angle θT may have an effect on its capacity. If a bucket's hinge support plate angle θT is smaller than the disclosed values, the bucket's capacity may be too large, which can increase cycle times with added travel time for material entering into and exiting out of the bucket. If a bucket's hinge support plate angle θT is larger than the disclosed values, the bucket's hinge strength may be affected, thus reducing the amount of material that can be loaded into the bucket.
The disclosed side bar angle θ2 may be about 48°. Providing a side bar angle θ2 at about 48° may help enhance visibility to the machine operator, while ensuring the ability of bucket 10 to penetrate material. For example, if the side bar angle θ2 is too small, the bucket may not be able to sufficiently penetrate the material. On the other hand, if the side bar angle θ2 is too large, it may impair the operator's visibility, which may hurt efficiency.
It will be apparent to those skilled in the art that various modifications and variations can be made in the disclosed buckets without departing from the scope of the disclosure. Additionally, other embodiments of the disclosed buckets will be apparent to those skilled in the art from consideration of the specification. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.
