Patent Publication Number: US-2023157201-A1

Title: Work vehicle with commodity metering system and airflow system

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This is a divisional application of U.S. application Ser. No. 16/733,387, filed Jan. 3, 2020, now allowed, which is a divisional application of U.S. application Ser. No. 15/670,834, filed Aug. 7, 2017, now U.S. Pat. No. 10,555,455, issued Feb. 11, 2020. 
     STATEMENT OF FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not applicable. 
    
    
     FIELD OF THE DISCLOSURE 
     This disclosure relates to work vehicles and implements, and more specifically, to a work vehicle with an improved volumetric metering system and/or an improved airflow system. 
     BACKGROUND OF THE DISCLOSURE 
     Work vehicles, such as air seeders and other seeding devices, are configured for applying seed, fertilizer, and/or other particulate commodities to a field. The work vehicle may also include tilling equipment for applying the commodity under the surface of the soil. 
     Work vehicles typically include one or more tanks and a metering system that meters out a predetermined quantity of the commodity from the tank as the work vehicle moves across the field. The metered particles move into a high velocity airstream generated by an airflow system of the vehicle. Once in the airstream, the particles are delivered to the soil. 
     SUMMARY OF THE DISCLOSURE 
     This disclosure provides a commodity-distributing work vehicle with various improvements. For example, the work vehicle of the present disclosure may include one or more features that increase accessibility of the metering system, the airstream system, and/or other areas. Some features may facilitate assembly and disassembly of these systems, for example, when cleaning out the machine. Also, the work vehicle may include a venturi structure with plural venturi tubes arranged in a compact manner. 
     In one aspect, the disclosure provides a work vehicle that includes a commodity container and a metering assembly configured to meter a commodity out from the commodity container along an axis. The work vehicle also includes an airflow structure that defines at least one air passage for an airstream. The airflow structure is supported for movement relative to the metering assembly between a first position and a second position. The airflow structure, in the first position, is configured to receive units of the commodity travelling generally along the axis to be introduced into the airstream. The airflow structure, in the second position, is spaced away from the metering assembly to provide unobstructed access to the metering assembly along the axis in an upstream direction. 
     In another aspect, a work vehicle is disclosed that includes a frame and a commodity container that is supported by the frame. The work vehicle also includes a metering system configured to meter a commodity out from the commodity container. The metering system includes a metering element and a plurality of commodity tubes configured to receive the commodity from the metering element. Furthermore, the work vehicle includes a covering structure with a panel that is supported on the frame for movement between a first position and a second position. The panel is substantially rigid. The panel, in the first position, covers the metering element and the plurality of commodity tubes. The panel, in the second position, exposes the metering element and the plurality of commodity tubes. 
     In an additional aspect, the disclosure provides a work vehicle that includes a commodity container and a metering system configured to meter a commodity out from the commodity container. The metering system includes a metering element, a support structure, and a latch mechanism with a biasing member. The latch mechanism is configured to move between a latched position and an unlatched position. The latch mechanism, in the latched position, retains the metering element to the support structure. The latch mechanism, in the unlatched position, releases the metering element from the support structure. The biasing member biases the latch mechanism toward the latched position. The latch mechanism is configured to move the metering element away from the support structure as the latch mechanism moves from the latched position toward the unlatched position. 
     In a further aspect, a metering system is disclosed for a work vehicle. The metering system includes a support structure with a passage. The metering system also includes a divider member having a barrier wall and a retainer. The barrier wall includes a notch. The retainer attaches the divider member to the support structure. The metering system further includes a rotatable metering element with a shaft and a projection that projects from the shaft substantially in a radial direction. The shaft is removably received within the notch. The rotatable metering element is configured to rotate within the notch relative to the support structure such that the projection meters out a commodity into the passage of the support structure. The barrier wall directs at least some of the commodity into the passage. 
     In another aspect, an airflow structure of a work vehicle is disclosed that includes a first venturi tube and a second venturi tube. The airflow structure also includes a support structure that is fixed to the first venturi tube and the second venturi tube. The support structure includes a first passage that is fluidly connected to the first venturi tube, a second passage that is fluidly connected to the second venturi tube, and a divider wall between the first passage and the second passage. 
     In an additional aspect, a work vehicle is disclosed that includes a frame defining a front end and a rear end. The work vehicle also includes a commodity container that is supported on the frame and that is configured to hold a commodity. The work vehicle also includes a volumetric metering assembly disposed proximate the rear end of the frame. The metering assembly includes a rotatable metering element configured to rotate to meter out the commodity from the commodity container. Also, the work vehicle includes an airflow system that is disposed proximate the rear end of the frame. The airflow system includes an airflow structure configured to receive the commodity metered out from the metering system. The airflow structure includes a plenum and a venturi. The plenum is configured to deliver an airstream to the venturi. The venturi is configured to accelerate the airstream with the commodity therein away from the work vehicle. The metering assembly is manually accessible at the rear end of the work vehicle. 
     The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features and advantages will become apparent from the description, the drawings, and the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a rear perspective view of a work vehicle according to example embodiments of the present disclosure; 
         FIG.  2    is a rear perspective view of a portion of the work vehicle of  FIG.  1    that includes a metering assembly and a plenum assembly; 
         FIG.  3    is a section view of the central assembly taken along the line  3 - 3  of  FIG.  2   ; 
         FIG.  4    is a rear perspective view, wherein moveable parts of the metering assembly and plenum assembly are shown in various positions; 
         FIG.  5    is a lower perspective view, wherein the metering assembly is shown in an extended position; 
         FIG.  6    is a perspective view of the metering assembly of  FIG.  2   ; 
         FIG.  7    is a perspective view of a divider member of the metering assembly of  FIG.  2   ; 
         FIG.  8    is a perspective view of the metering assembly of  FIG.  2   , wherein a roller cartridge is shown in a latched position; 
         FIG.  9    is a perspective view of the metering assembly of  FIG.  2   , wherein the roller cartridge is shown in an unlatched position; 
         FIG.  10    is a section view showing movement of the plenum assembly from a raised position to a lowered position is shown; 
         FIG.  11    is a section view showing movement of the metering assembly from a retracted position to an extended position; 
         FIG.  12    is a section view showing the plenum assembly in the lowered position, the metering assembly in the extended position, and a covering structure of the metering assembly shown in an extended position; 
         FIG.  13    is a perspective view of the plenum assembly of  FIG.  2   ; and 
         FIG.  14    is a perspective view of a venturi structure of the plenum assembly of  FIG.  13   . 
     
    
    
     Like reference symbols in the various drawings indicate like elements. 
     DETAILED DESCRIPTION 
     The following describes one or more example embodiments of a work vehicle, its metering system, its airflow system, and more, as shown in the accompanying figures of the drawings described briefly above. Various modifications to the example embodiments may be contemplated by one of skill in the art. 
     As used herein, unless otherwise limited or modified, lists with elements that are separated by conjunctive terms (e.g., “and”) and that are also preceded by the phrase “one or more of” or “at least one of” indicate configurations or arrangements that potentially include individual elements of the list, or any combination thereof. For example, “at least one of A, B, and C” or “one or more of A, B, and C” indicates the possibilities of only A, only B, only C, or any combination of two or more of A, B, and C (e.g., A and B; B and C; A and C; or A, B, and C). 
     Furthermore, in detailing the disclosure, terms of direction, such as “forward,” “rear,” “front,” “back,” “lateral,” “horizontal,” and “vertical” may be used. Such terms are defined, at least in part, with respect to the direction in which the work vehicle or implement travels during use. The term “forward” and the abbreviated term “fore” (and any derivatives and variations) refer to a direction corresponding to the direction of travel of the work vehicle, while the term “aft” (and derivatives and variations) refer to an opposing direction. The term “fore-aft axis” may also reference an axis extending in fore and aft directions. By comparison, the term “lateral axis” may refer to an axis that is perpendicular to the fore-aft axis and extends in a horizontal plane; that is, a plane containing both the fore-aft and lateral axes. The term “vertical,” as appearing herein, refers to an axis or a direction orthogonal to the horizontal plane containing the fore-aft and lateral axes. 
     As used herein, the term “module” refers to any hardware, software, firmware, electronic control component, processing logic, and/or processor device, individually or in any combination, including without limitation: application specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that executes one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that provide the described functionality. 
     Embodiments of the present disclosure may be described herein in terms of functional and/or logical block components and various processing steps. It should be appreciated that such block components may be realized by any number of hardware, software, and/or firmware components configured to perform the specified functions. For example, an embodiment of the present disclosure may employ various integrated circuit components, e.g., memory elements, digital signal processing elements, logic elements, look-up tables, or the like, which may carry out a variety of functions under the control of one or more microprocessors or other control devices. In addition, those skilled in the art will appreciate that embodiments of the present disclosure may be practiced in conjunction with any number of systems, and that the work vehicle described herein is merely one exemplary embodiment of the present disclosure. 
     Conventional techniques related to signal processing, data transmission, signaling, control, and other functional aspects of the systems (and the individual operating components of the systems) may not be described in detail herein for brevity. Furthermore, the connecting lines shown in the various figures contained herein are intended to represent example functional relationships and/or physical couplings between the various elements. It should be noted that many alternative or additional functional relationships or physical connections may be present in an embodiment of the present disclosure. 
     The following describes one or more example implementations of the disclosed work vehicle for metering and delivering a commodity to the soil, as shown in the accompanying figures of the drawings described briefly above. Generally, the disclosed work vehicle improves access to the metering system, the airflow system, and/or other areas of the machine for more convenient clean out, as compared to conventional systems. The disclosed work vehicle also includes features that facilitate assembly and/or disassembly of the metering system. Furthermore, the work vehicle of the present disclosure provides an airflow structure that is more effective, more compact, and/or more convenient to install and replace than those of the prior art. 
       FIG.  1    illustrates a work vehicle  100  according to example embodiments of the present disclosure. The work vehicle  100  may be towed by another vehicle, such as a tractor. Thus, the work vehicle  100  may be a towed work vehicle. In other embodiments, the work vehicle  100  of the present disclosure may be a self-propelled vehicle. In some embodiments, the work vehicle  100  may be an air cart or air drill. It will be appreciated that the illustrated work vehicle  100  is an example embodiment. One or more features of the present disclosure may be included on a different work vehicle, such as a planter, a commodity cart, or other work vehicle without departing from the scope of the present disclosure. 
     The work vehicle  100  includes a front end  114  and a rear end  116 , and a fore-aft axis  118  extends generally between the front and rear ends  114 ,  116 . The work vehicle  100  also includes a first side  120  and a second side  122 , and a lateral axis  124  extends generally between the first and second sides  120 ,  122 . A vertical axis  126  extends perpendicular to both the fore-aft axis  118  and the lateral axis  124 . 
     Generally, the work vehicle  100  may include a chassis  110  and a plurality of wheels  112 . The chassis  110  may be a rigid frame that supports the components described in detail below. The wheels  112  may support the chassis  110  and enable movement of the vehicle  100  across the field. 
     The work vehicle  100  may also include one or more commodity containers  128 . The container  128  may be supported on the chassis  110  and disposed proximate the rear end  116 . Also, in some embodiments, the container  128  may be disposed centrally between the first side  120  and the second side  122 . The commodity container  128  may contain seed, fertilizer, and/or another particulate or granular commodity. 
     Additionally, the work vehicle  100  may include a metering system  130 . The metering system  130  may be a volumetric metering system. The metering system  130  may be disposed generally underneath the commodity container  128  in some embodiments. As such, particles of the commodity within the container  128  may fall due to gravity toward the metering system  130 . The metering system  130  may operate to meter out the commodity (e.g., by volume) from the container  128  at a controlled rate as the vehicle  100  moves across the field. 
     The work vehicle  100  may also include an airflow system  132 . The airflow system  132  may include a fan  134  that generates a flow of air. The airflow system  132  may also include a plurality of airflow structures (e.g., plenums, tubes, lines, etc.) that receive the air blowing from the fan  134 . Particles of the commodity (metered out by the metering system  130 ) may fall into the air stream and may flow to a distribution system  136 . The distribution system  136  may include a plurality of hoses, lines, or other conduits that extend to different areas of the vehicle  100  along the lateral axis  124 . The particles of the commodity may be propelled by the airstream through the distribution system  136  toward the soil. The work vehicle  100  may also include a ground system  138  with openers, tillers or other similar implements that prepare the soil for delivery of the seed, fertilizer, or other commodity delivered by the distribution system  136 . 
     Moreover, the work vehicle  100  may include a control system  140 . The control system  140  may be in communication with and may be configured for controlling the metering system  130 , the airflow system  132 , and/or other components of the work vehicle  100 . The control system  140  may be wholly supported on the work vehicle  100 , or the control system  140  may include components that are remote from the vehicle  100 . The control system  140  may be in electronic, hydraulic, pneumatic, mechanical, or other communication with the metering system  130 , the airflow system  132 , etc. In some embodiments, the control system  140  may be in communication with actuators, sensors, and/or other components of the work vehicle  100 . 
     During operation of the work vehicle  100  (e.g., when towed by a tractor or other towing vehicle across a field), the commodity may fall from the container  128  toward the metering system  130 . The control system  140  may control the metering system  130  (e.g., by controlled actuation of a motor or other actuator), which allows a controlled quantity of particles to pass into the airflow system  132  at a predetermined rate. The control system  140  may also control the fan  134  for generating a continuous airstream that blows through the airflow system  132 , receives the particles metered out from the metering system  130 , and flows through the distribution system  136  across the work vehicle  100  to the soil. 
     The work vehicle  100  may include one or more components that are mounted for movement, for example, relative to the chassis  110 . In some situations, the user may need to move these components when cleaning out the work vehicle  100 . In some embodiments, these components may be mounted such that a single person can move these components. In some embodiments, the user may move and/or remove these components manually, by hand, and without the aid of extra tools. These components, their construction, and their methods of use and assembly provide substantial improvements. For example, the work vehicle  100  of the present disclosure may facilitate disassembly, re-assembly, clean-out, repair, part replacement, and more. 
     These components will be discussed in greater detail with reference to  FIGS.  2 - 5   , which show in detail a portion of the work vehicle  100 . In particular, a central assembly  148  of the work vehicle  100  is shown. The central assembly  148  may be supported on the chassis  110 , proximate the rear end  116  of the vehicle  100 . Also, in some embodiments, the central assembly  148  may define portions of the commodity container  128 , the metering system  130 , and/or the airflow system  132 . 
     Referring initially to  FIG.  2   , the central assembly  148  may include a frame  150  with a first plate  152  and a second plate  154  that are separated at a distance along the lateral axis  124 . The first and second plates  154  may be strong, rigid members made, for example, from steel, aluminum, or other metal. In some embodiments, the first and second plates  152 ,  154  and/or other portions of the frame  150  may be fixed to the chassis  110  of the vehicle  100 . As will be discussed, the first and second plates  152 ,  154  may support other components of the central assembly  148 . 
     As shown in  FIGS.  2  and  4   , the central assembly  148  may further include a trough member  156 . The trough member  156  may be generally box-shaped with an open top end  158 . The trough member  156  may include a rear wall  160  that faces generally toward the rear end  116  of the vehicle  100 . The trough member  156  may also include an opposite front wall  162 . The trough member  156  may further include an upper lip  164  that defines the open top end  158 . 
     The trough member  156  may be elongate along the lateral axis  124  between the first plate  152  and the second plate  154 . The upper lip  164  may be supported atop and fixed to the first plate  152 , the second plate  154  and/or other portions of the frame  150 . The trough member  156  may receive the seed, fertilizer, or other commodity within the commodity container  128  ( FIG.  1   ). The commodity may collect within the trough member  156 . 
     As shown in  FIGS.  3  and  4   , the rear wall  160  of the trough member  156  may include one or more wall members  166 . In some embodiments, a representative wall member  166  may be substantially thin, flat plate with an upper flange  168 . The wall member  166  may be mounted for movement to a respective support member  170  ( FIG.  4   ). In some embodiments, the wall member  166  may be slideably supported by support members  170  (i.e., slider supports) on opposite edges of the wall member  166 . Accordingly, the wall member  166  may slide upward to a raised position and slide downward to a lowered position. (In  FIG.  4   , an end wall member  172  is shown in the raised position, and the remaining wall members  166  are shown in the lowered position.) In some embodiments, the wall members  166  may be controlled by an actuator, such as a mechanical linear actuator, a solenoid, etc. The control system  140  may control the actuator for controlled movement of the wall members  166 . It will be appreciated that the wall member  166  may be positioned in the raised position, the lowered position, and any number of intermediate positions. The position of the wall member  166  may control the size (i.e., area) of a rear opening  174  of the trough member  156 . 
     The commodity may pass out of the trough member  156  via the rear openings  174  and fall toward the metering system  130  as will be discussed in greater detail below. Thus, when raised, the wall members  166  may increase the flow of commodity out of the trough member  156 . On the contrary, when lowered, the wall members  166  may impede flow of commodity out of the trough member  156 . 
     Referring now to  FIGS.  4 ,  5 ,  11 , and  12   , the metering system  130  will be discussed in greater detail according to example embodiments. In some embodiments, the metering system  130  may be a volumetric metering system. In other embodiments, the metering system  130  may include be a singulating meter. 
     As shown in  FIG.  4   , the metering system  130  may include at least one metering assembly  203 . In the illustrated embodiment, there are two metering assemblies  203  that extend along the lateral axis  124  of the vehicle  100 . One of the metering assemblies  203  is proximate the first side  120  of the vehicle  100 , and the other metering assembly  203  is proximate the second side  120 . The metering assemblies  203  may be substantially similar. 
     As an example, the metering assembly  203  may be supported on one or more metering support structures  202  ( FIGS.  4  and  12   ). In the illustrated embodiment, the metering assembly  203  may include at least two support structures  202  with one at each lateral end of the metering assembly  203 . The support structures  202  may be substantially similar to each other. The metering support structure  202  may be a rigid member made, for example, from bent, welded, or otherwise formed steel plate. The metering support structure  202  may be elongate and may be pivotally attached at a first joint  204  to the frame  150 . More specifically, the metering support structure  202  may be rotatably attached to the plate  152  by a pin, a hinge, a bearing, or other fastener. In some embodiments, the metering assembly  203  may rotate about an axis of rotation that extends substantially parallel to the lateral axis  124 . Accordingly, as shown in  FIG.  11   , the metering assembly  203  may rotatably move between a between a first position (i.e., a retracted or lowered position) (shown in phantom) and a second position (i.e., an extended or raised position) (shown in solid lines) relative to the frame  150 . As shown, the metering assembly  203  may swing generally rearward toward the rear end  116  of the vehicle  100  and upward (i.e., clockwise as viewed in  FIG.  11   ) when moving from the first position to the second position. 
     In some embodiments, the metering assembly  203  may also include one or more retainers that selectively retain the metering assembly  203  in the first position, in the second position, and/or in an intermediate position. The retainer may include a latch, a prop bar, a fastener, or other structures. Furthermore, the metering assembly  203  may be manually moved by one person and by-hand (i.e., without the aid of additional tools). Thus, the metering assembly  203  may be easily moved, for example, when cleaning-out the metering assembly  203 . In addition, as shown in  FIG.  11   , the metering assembly  203  may have a large range of motion for moving between the first and second positions. Accordingly, the interior components described in detail below may be highly accessible for cleaning, repair, etc. 
     Moreover, the central assembly  148  may further include a first covering structure  238  and a second covering structure  235 . The first and second covering structures  238 ,  235  may be substantially similar to each other. 
     As a representative example, the covering structure  238  may include a relatively flat panel  239 . The panel  239  may be made from sheet metal and may be substantially rigid in some embodiments. The panel  239  may also be rectangular and may include a first edge  246 , a second edge  248 , a first side edge  250 , and a second side edge  252 . 
     Furthermore, the covering structure  238  may include one or more covering support structures  243  ( FIGS.  2 ,  4 , and  12   ). In the illustrated embodiment, the covering structure  238  may include at least two support structures  243  with one at each lateral end of the panel  239 . The support structures  243  may be substantially similar to each other. The covering support structure  243  may be a rigid member made, for example, from bent, welded, or otherwise formed steel plate. The covering support structure  243  may be elongate and may be pivotally attached at a second joint  240  to the support structure  202  of the metering assembly  203 . More specifically, the covering support structure  243  may be rotatably attached to the metering support structure  202  by a bracket, a hinge, a pin, a bearing, or other hardware. Also, the second joint  240  may be disposed proximate the second edge  248  (i.e., the lower edge) of the panel  239 . The covering support structure  243  may rotate about an axis of rotation that extends substantially parallel to the lateral axis  124 . 
     Accordingly, the first covering structure  238  and the second covering structure  235  may independently move relative to the respective metering assembly  203  between a number of positions. In some embodiments, the covering structures  238 ,  235  may have a first position ( FIG.  2   ), wherein the panels  239  cover over the rear-facing portions of the metering assemblies  203 . In  FIG.  4   , the second covering structure  235  is shown in a second position, wherein the panel  239  has rotated (flipped) downward to be substantially parallel to the ground and to expose the metering assembly  203 . Also, in  FIG.  4   , the first covering structure  238  is shown in a third position, wherein the panel  239  has rotated (flipped) further downward to be more perpendicular to the ground and wherein the metering assembly  203  is exposed. 
     In some embodiments, the covering structures  238 ,  235  may include one or more retainers that selectively retain the panel  239  in the first position, the second position, and/or the third position. For example, as shown in  FIG.  2   , the retainer may include at least one magnetic element  254  that releasably and magnetically retains the panel  239  in the first position. The magnetic element  254  may be a permanent magnet supported on the panel  239 , proximate the first edge  246 . The magnetic element  254  may magnetically attach to the metallic material of the trough member  156  in some embodiments. In other embodiments, the covering structures  238 ,  235  may include different retainers, such as a mechanical latch. It will be appreciated that the retainers are optional and that, in additional embodiments, the covering structure  238 ,  235  may be self-supporting such that the panel  239  remains stationary and fixed in the first position due to the way that its weight is distributed on the metering assembly  203  at the first position. 
     The covering structures  238 ,  235  provide several advantages. For example, the covering structures  238 ,  235  may selectively cover over the metering assembly  203 , protecting these components from the elements, from dust, and other foreign objects. Moreover, the covering structures  238 ,  235  may be easily moved to expose the metering assembly  203 , for example, during clean-out, repair, etc. 
     It is also noted that the metering assembly  203  is highly accessible. Indeed, the covering structure  238 ,  235  may be moved relative to the metering assembly  203  to expose the rear-facing portions of the metering assembly  203 . Also, the metering assembly  203  may be moved relative to the frame  150  to expose the front-facing portions of the metering assembly  203 . 
     Referring now to  FIGS.  4 ,  6 ,  8 , and  9   , components of the metering assembly  203  will be discussed according to example embodiments of the present disclosure. As shown, the metering assembly  203  may include a metering element  206 . In some embodiments, the metering element  206  may be a rotatable metering element  206  that provides volumetric metering. The metering element  206  may be referred to as a roller or a roller cartridge. 
     The rotatable metering element  206  may include a shaft  208  with a first end  209  and a second end  211  ( FIG.  4   ). The shaft  208  may have a relatively straight axis that extends substantially parallel to the lateral axis  124 . The metering element  206  may also include a plurality of wheels  210  that are supported on the shaft  208 . The wheels  210  may include a plurality of projections  212  that project radially away from the wheel  210 . 
     Additionally, the metering element  206  may include at least bearing structure  214  ( FIGS.  8  and  9   ). For example as shown in  FIG.  8   , there may be a bearing structure  214  that rotatably supports the first end  209  of the shaft  208 . Although not shown, there may also be a bearing structure  214  that rotatably supports the second end  211  of the shaft. The bearing structure  214  may include an outer structure (e.g., an outer race of the bearing) that is configured to releasably attach to the metering support structure  202 . In some embodiments, the bearing structure  214  may be rectangular or cruciform in shape and may include one or more (e.g., four) grooves  258 . The bearing structure  214  may be received in an opening of the metering support structure  202 , and one or more of the grooves  258  may receive an edge of the metering support structure  202  to support the bearing structure  214  thereon. 
     As shown in  FIGS.  8  and  9   , the metering assembly  203  may further include a latch mechanism  224 . The latch mechanism  224  may include a lever  221  with a first portion  217  and a second portion  219  that are separated at a distance. In some embodiments, the lever  221  may be generally L-shaped. Also, the first portion  217  of the lever  221  may include a hook feature  223 . The lever  221  may be attached to the metering support structure  202 , and the lever  221  may rotate between a latched position ( FIG.  8   ) and an unlatched position ( FIG.  9   ). In the latched position, the hook feature  223  may engage the bearing structure  214  of the metering element  206 . For example, the hook feature  223  may be received within a notch  256  of the bearing structure  214  for engagement and attaching the metering element  206  to the metering support structure  202 . When the latch mechanism  224  is in the unlatched position, the hook feature  223  may be disposed outside the notch  256  to release the bearing structure  214 . 
     Additionally, in some embodiments, the latch mechanism  224  may include a biasing member  230 . The biasing member  230  may include a spring, such as a compression spring, a torsion spring, etc. The biasing member  230  may bias the lever  221  toward the latched position ( FIG.  8   ). Accordingly, when unlatching the metering element  206 , the user may press against the first portion  217  of the lever  221 , against the biasing force provided by the biasing member  230  until the hook feature  223  moves out of the notch  256 . 
     Moreover, in some embodiments, as the lever  221  rotates toward the unlatched position, the second portion  219  may rotate toward and abut against the bearing structure  214  and push the metering element  206  away from the metering support structure  202 . Accordingly, the lever  221  may assist the user in removal of the metering element  206  from the metering support structure  202  for added convenience. 
     When re-assembling the metering element  206 , the user may press the bearing structure  214  of the metering element  206  against the latch mechanism  224  and move the lever  221  toward the unlatched position. The user may continue pushing the bearing structure  214  into place, allowing the biasing member  230  to bias the hook feature  223  into engagement with the bearing structure  214 . 
     As shown in  FIGS.  3 ,  4 ,  6 ,  8  and  9   , the metering assembly  203  may further include a plurality of commodity tubes  216 . The commodity tubes  216  may be referred to as commodity cups. As an example, the commodity tube  216  may include a plurality of side walls  218  ( FIGS.  6 ,  8 , and  9   ). The side walls  218  may be arranged about a tube axis  227  ( FIG.  3   ) so as to define a passage  225 . The passage  225  may have a first end  220  and a second end  222  ( FIG.  3   ). The commodity tubes  216  may be supported by one or more transverse support bars  201 , which extend between the metering support structures  202 . As such, the first end  220  of the commodity tube  216  may be disposed proximate the metering element  206  for receiving the commodity. Also, as shown in  FIG.  6   , an opposing pair of the side walls  218  may define a notch  264  in the commodity tube  216 . The notch  264  may extend at an angle relative to the tube axis  227 . The notch  264  may receive the shaft  208  of the metering element  206 . 
     Additionally, as shown in  FIGS.  6  and  7   , the metering assembly  203  may include a plurality of divider members  232 . As shown in  FIG.  7   , the divider member  232  may include a barrier wall  234  and one or more retainers  236 . The barrier wall  234  may be a relatively flat plate of material, such as a polymeric material. The barrier wall  234  may include a notch-like opening  237  in some embodiments. The opening  237  may receive the shaft  208  of the metering element  206  as shown in  FIG.  6   . In some embodiments, the barrier wall  234  may be substantially C-shaped and may include retainer  236  at each end. The retainers  236  may be integrally attached to the barrier wall  234  so as to be monolithic. The retainers  236  may be configured as resiliently flexible clips in some embodiments; however, it will be appreciated that the retainers  236  could be bolts, separate fasteners, or other components without departing from the scope of the present disclosure. In some embodiments, the retainer  236  may curve away from the barrier wall  234  and back toward the barrier wall  234 . Accordingly, the retainer  236  may define an open end  260 . As shown in  FIG.  7   , the retainers  236  of the divider member  232  may have different orientations relative to each other. For example, the orientation of one retainer  236  may be oriented approximately ninety degrees (90°) relative to the other (i.e., orthogonal orientations). Stated differently, the open end  260  of one retainer  236  may be directed along the fore-aft axis  118 , and the open end  260  of the other retainer  236  may be directed along the vertical axis  126 . 
     As shown in  FIG.  6   , the divider member  232  may be removably attached to a side wall  218  of a commodity tube  216 . Specifically, the open ends  260  of the retainers  236  may receive a lip  262  of the commodity tube  216  proximate the first end  220  of the passage  225 . (One retainer  236  may receive a vertical lip  262 , and the other retainer  236  may receive a horizontal lip  262  as shown.) The lip  262  may include an enlarged ridge  263 . Once attached, the resiliency of the retainers  236  and the enlarged ridge  263  may help retain the divider member  232  to the commodity tube  216 . The barrier wall  234  may be received within and may be layered over the inner surface of the side wall  218 . Also, the shaft  208  may be received within the opening  237  of the divider member  232 . Accordingly, the barrier wall  234  may act as a barrier for directing the commodity as it falls through the commodity tube  216 . 
     Furthermore, the divider member  232  may facilitate assembly, disassembly, and re-assembly of the metering element  206 . For example, because of the orientation of the retainers  236 , the divider member  232  may be retained to the side wall  218  and, yet, may float along at least two axes (e.g., the fore-aft axis  118  and the vertical axis  126 ). This may facilitate installation of the metering element  206 . In some cases, the divider members  232  or other components may be slightly misaligned. Regardless, the metering element  206  may be inserted, pushing the divider member  232  into alignment due to the orientation of the retainers  236 . 
     During operation of the metering assembly  203 , the metering element  206  may rotate about the axis of the shaft  208 . Commodity from the trough member  156  may fall onto the wheels  210  of the metering element  206 . As the metering element  206  rotates, the commodity may fall from the wheels  210  and into the first end  220  of the passage  225 . The commodity may fall through the passage  225  and exit the commodity tube  216  through the second end  222 . 
     Referring now to  FIGS.  2 - 4 ,  13 , and  14   , the airflow system  132  will be discussed in greater detail. As mentioned above, the airflow system  132  may include a fan  134  that generates the airflow ( FIG.  3   ). The airflow system  132  may also include at least one upstream duct structure  266  that is fluidly connected to the fan  134  to receive airflow therefrom. The airflow system  132  may further include at least one plenum assembly  268 , which is fluidly connected to the upstream duct structure  266  to receive airflow therefrom. In some embodiments, the plenum assembly  268  may also receive the commodity metered out from the metering assembly  203 , and blow the commodity toward the distribution system  136  for delivery to the soil. 
     As shown in  FIGS.  2  and  4   , there may be a first plenum assembly  268  and a second plenum assembly  270 . Accordingly, each metering assembly  203  may have an associated plenum assembly  268 ,  270 . The plenum assemblies  268 ,  270  may be substantially similar to each other. 
     As shown in  FIGS.  3  and  13   , the plenum assembly  268  may include a plenum  272 . The plenum may be a hollow member with an inlet end  274  and an outlet end  280 . The plenum  272  may define an axis  276  that extends between the inlet end  274  and the outlet end  280 . The inlet end  274  may be substantially circular in cross section. The inlet end  274  may be fluidly connected to the upstream duct structure  266 . The plenum  272  may taper outward in width (i.e., along the lateral axis  124 ) as the plenum  272  extends in a downstream direction from the inlet end  274 , generally rearward toward a curved segment  278 . The axis  276  may turn forward through the curved segment  278 . Also, the plenum  272  may include a stepped wall  282  that defines the outlet end  280 . The wall  282  may include a plurality of apertures  284  (e.g., through-holes) extending therethrough. 
     The plenum assembly  268  may also include a plenum support structure  286 . The plenum support structure  286  may be made from a rigid and strong material, such as steel. In some embodiments, the support structure  286  may include a mount  288  and a bracket  290  ( FIG.  13   ). The mount  288  may include a base flange  292  that extends along the lateral axis  124 . The mount  288  may further include a plurality of projections  294 . The projections  294  may be spaced apart along the lateral length of the mount  288 . As shown, the projections  294  may extend from the base flange  292  at an angle (e.g., at an acute angle relative to the lateral axis  124  and the vertical axis  126 . The mount  288  may additionally include a backing plate  289 . The backing plate  289  may be disposed inside the plenum  272 . The projections  294  and the backing plate  289  may sandwich a part of the stepped wall  282  therebetween and a plurality of fasteners  320  may be used for attaching the mount  288  to the stepped wall. 
     The brackets  290  may be attached to opposite ends of the mount  288  as shown in  FIG.  2   . The brackets  290  may also be attached to the frame  150  at a third joint  296  ( FIG.  10   ). In some embodiments, the brackets  290  may support rotational movement of the plenum assembly  268  relative to the frame  150  about the third joint  296 . The axis of rotation of the third joint  296  may extend substantially parallel to the lateral axis  124 . Thus, the plenum assembly  268  may rotate between a raised position (shown in phantom in  FIG.  10   ) and a lowered position (shown in solid lines). The plenum assembly  268  may rotate generally downward and forward when moving from the raised position to the lowered position. The plenum assembly  268  may also include a retainer (e.g., a latch) for retaining the plenum assembly  268 , for example, in the raised position. In some embodiments, the plenum assembly  268  may be connected to a portion of the metering assembly  203  when in the raised position, and the plenum assembly  268  may be spaced apart from the metering assembly  203  when in the lowered position. 
     In some embodiments, the plenum assembly  268  may be lowered manually without the aid of extra tools. Also, the plenum assembly  268  may include a handle  299 . The handle  299  may be attached to the support structure  286  and may extend laterally across the curved segment  278  of the plenum  272 . The user may grasp the handle  299  for raising and lowering the plenum assembly  268 . 
     It will be appreciated that the range of motion of the plenum assembly  268  (between the raised position and the lowered position) is relatively large (e.g., at least eighty degrees of rotation about the third joint  296 ). Accordingly, the plenum assembly  268  may swing downward and lowered out of the way to provide access to the metering assembly  203 . For example, the plenum assembly  268  may be lowered to provide access to the second end  222  of the commodity tubes  216 . In some embodiments, the plenum assembly  268  may swing far enough to allow access to the commodity tubes  216  along the axis  227  in an upstream direction (i.e., toward the first end  220 ). In other words, the plenum assembly  268  may move far enough such that the axis  227  does not intersect the plenum assembly  268  as it extends out from the second end  222  of the commodity tube  216 . Accordingly, the plenum assembly  268  may be lowered to expose the metering assembly  203 , for example, when cleaning out the metering assembly  203 . 
     Additionally, as shown in  FIG.  4   , when the plenum assembly  268  is lowered, the covering structure  238  may be flipped down to the third position, wherein the covering structure  238  exposes the metering assembly  203  and is substantially perpendicular to the ground. This allows for increased access to the metering assembly  203 . 
     As shown in  FIGS.  13  and  14   , the plenum assembly  268  may further include at least one venturi structure  300 . The venturi structure  300  may be a unitary, one piece member in some embodiments. The venturi structure  300  may be made from a polymeric material in some embodiments. The venturi structure  300  may also be formed via molding, casting, additive manufacturing, or using other techniques. 
     The venturi structure  300  may include a funnel portion  302  (i.e., a support structure). The funnel portion  302  may include a divider wall  304 . The divider wall  304  may divide the interior of the funnel portion  302  into a first passage  306  and a second passage  308 . The venturi structure  300  may also include a support plate  312  that extends from an upper lip of the funnel portion  302 . A slot  314  may be defined between the support plate and the funnel portion  302 . 
     Additionally, the venturi structure  300  may include a first venturi tube  316  and a second venturi tube  318 . The first and second venturi tubes  316 ,  318  may extend through the support plate  312  and may project forward from the funnel portion  302 . The first venturi tube  316  may be fluidly connected to the first passage  306 . Also, the first venturi tube  316  may extend substantially perpendicular relative to the first passage  306 . Furthermore, the second venturi tube  318  may be fluidly connected to the second passage  308  and may extend substantially perpendicular thereto. 
     In some embodiments, the first and second venturi tubes  316 ,  318  may be offset along the lateral axis  124  with respect to each other. Also, the first and second venturi tubes  316 ,  318  may be offset along the vertical axis  126  with respect to each other. 
     The venturi structure  300  may be removeably attached to the plenum  272  and/or the mount  288 . For example, the projection  294  of the mount  288  may be received within the slot  314  of the venturi structure  300 . Moreover, a respective one of the fasteners  320  may extend through the projection  294 , the stepped wall  282  of the plenum  272 , the support plate  312  of the venturi structure  300 , and the backing plate  289  to secure the venturi structure  300  to the plenum  272  and the plenum support structure  286 . In some embodiments, the fastener  320  may be the only fastener needed for attaching the venturi structure  300 . Thus, the venturi structure  300  may be installed and removed relatively quickly and conveniently. 
     Also, the inlet ends of the first and second venturi tubes  316 ,  318  may be fluidly connected to respective ones of the apertures  284  of the plenum  272 . The outlet ends of the venturi tubes  316 ,  318  may be connected to respective hoses  322  of the distribution system  136  ( FIG.  3   ). 
     It will be appreciated that the staggered arrangement of the venturi tubes  316 ,  318  may make the plenum assembly  268  relatively compact. Accordingly a large number of venturi tubes  316 ,  318  may be arranged along the lateral axis  124 , and yet there can be enough room for the hoses  322  of the distribution system  136  and other structures on the work vehicle  100 . 
     As represented in  FIG.  3   , the work vehicle  100  may further include a control system  350 . The control system  350  may include and/or communicate with components of a computerized device, such as a processor, a data storage device, a user interface with a display and a keyboard or other related devices, etc. The control system  350  may communicate with an actuator  352 . In some embodiments, the actuator  352  may be operably connected to the metering element  206  for driving (e.g., rotating) the metering element  206 . The actuator  352  may be of any suitable type, such as an electric motor, a hydraulic actuator, or otherwise. Also, the control system  350  may be in communication with a sensor  354  configured to detect a speed (e.g., an angular speed) of the actuator  352  and/or the metering element  206 . The sensor  354  may be an optical sensor, an electrical sensor, or other type without departing from the scope of the present disclosure. Accordingly, in some embodiments, the control system  350  may control the motor  356  and receive associated feedback from the sensor  354  for closed-loop control. Also, in some embodiments, the control system  350  may be in communication with the fan  134  for controlling the airflow system  132 . It will be appreciated that the control system  350  may be in communication with and may control other systems as well. 
     As shown in  FIGS.  2  and  4   , the actuator  352  may include an electric motor  356 . The electric motor  356  may include a first output member  358  and a second output member  360 . The first output member  358  may be a shaft that is attached directly to the motor  356 . The second output member  360  may be a gear or other transmission component that selectively engages with the first output member  358 . The second output member  360  may be operably connected to the metering element  206 . As shown in  FIG.  2   , the first and second output members  358 ,  360  may be engaged such that power output from the motor is transferred to the metering element  206 . In contrast, as shown in  FIG.  12   , the first and second output members  358 ,  360  may disengage when moving the metering assembly  203  from the lowered position to the raised position. 
     Accordingly, during operation, the work vehicle  100  may be towed across a field with the metering assembly  203 , and the plenum assembly  268  in the positions shown in  FIG.  3    (i.e., the metering assembly  203  in the retracted position and the plenum assembly  268  in the raised position). The control system  350  may generate control signals for operating the electric motor  356  at a controlled speed, such that the metering element  206  meters out a predetermined amount of the commodity from the commodity container  128 . The commodity may travel through the commodity tube  216  and fall into either the first passage  306  or second passage  308  of the venturi structure  300 . The commodity may be ejected from the venturi structure  300  toward the distribution system  136  and ultimately to the soil. 
     There may be a need to clean out the metering assembly  203 . For example, the user may want to plant a different commodity than the one currently loaded. Internal components may also need to be reconfigured, replaced, repaired, etc. Advantageously, the metering assembly  203  and the plenum assembly  268  may move between various positions to facilitate clean-out, repair, etc. 
     For example, the metering assembly  203  and the plenum assembly  268  can be conveniently moved and accessed from the rear side  116  of the vehicle  100 . As shown in  FIG.  1   , the metering assembly  203  may be disposed between the central wheels  112  of the vehicle  100 , allowing user access. Also, the metering assembly  203  may be disposed rearward with respect to the cutters, tillers, or other ground-engaging tools of the ground system  138 . More specifically, the metering assembly  203  may be disposed at a first axial position  101 , whereas the ground engaging-tools of the ground system  138  may be disposed at a second axial positon  103 . The first axial position  101  may be disposed rearward on the axis  118  relative to the second axial position  103 . Accordingly, the user may access the metering assembly  203  without interference from the ground system  138 . 
     Also, to access internal components of the metering assembly  203  and/or the plenum assembly  268 , the user manually uses the handle  299  to rotate and lower the plenum assembly  268  as represented in  FIG.  10   . In this position, the user may probe the second end  222  of the commodity tube  216 . Furthermore, the user may rotate and lift the metering assembly  203  as represented in  FIG.  11   . This provides access to the metering assembly  203  as represented in  FIG.  5   . Moreover, the user may rotate and flip over the covering structure  238  as represented in  FIG.  12   . 
     Furthermore, the metering assembly  203  may be disposed high enough off of the ground to allow a receptacle  397  (e.g., a probox) to be placed underneath the metering assembly  203 . In some embodiments, with the plenum assembly  268  lowered and moved forward, the metering assembly  203  may disposed at a height  399  (measured from the ground, soil, etc.) of at least sixty-five inches (65 in.) to accommodate the receptacle  397 . The underside of the metering assembly  203  may be at least sixty-five inches off the ground in the lowered position ( FIG.  11   ) as well. Accordingly, the receptacle  397  may be used to conveniently capture the commodity cleaned out of the metering assembly  203 . 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     The description of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the disclosure. Explicitly referenced embodiments herein were chosen and described in order to best explain the principles of the disclosure and their practical application, and to enable others of ordinary skill in the art to understand the disclosure and recognize many alternatives, modifications, and variations on the described example(s). Accordingly, various embodiments and implementations other than those explicitly described are within the scope of the following claims.