JP7023760B2 - combine - Google Patents

Description

The present invention relates to a combine.

There is known a combine that is configured to catch the threshed product leaked from the threshing net of the threshing section with a feed pan and perform auxiliary rocking sorting by a sieve line before reaching the chaff sheave. By performing auxiliary sorting with a sieve line, it is possible to reduce the processing burden on the chaff sheave and prevent the threshed product containing a large amount of grains from being discharged from the rear while being loaded on the chaff sheave.

In the combine described in Patent Document 1, a sieve wire is attached to the rear end portion of the feed pan (Glen pan). However, in such a configuration, the threshed product containing straw waste or the like tends to be wrapped around the frame supporting the sieve wire, and when the wrapped threshed product is deposited, problems such as hindering auxiliary sorting by the threshing wire occur.

Japanese Unexamined Patent Publication No. 2014-14329

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a combine capable of preventing a threshed product from being wrapped around a member supporting a sieve wire.

The combine according to the present invention has a threshing section having a handling cylinder, supports provided on one left and right sides of the threshing section, and an arm attached to the support in the front-rear direction with respect to the support. It is equipped with a swaying wire that is supported so that it can be swung. The amount of leakage of the threshed product leaking from the receiving net is large in the central portion in the width direction of the threshing portion and small in the widthwise end portion of the threshing portion. Therefore, by supporting the threshing wire with an arm attached to a support on one side on the left and right sides of the threshing portion, it is possible to prevent the threshing product from being wrapped around a member (that is, an arm) that supports the threshing wire. Moreover, since the sieving wire is supported so as to be swingable in the front-rear direction with respect to the support, auxiliary sorting by the sieving wire is appropriately performed.

A swing sorting unit for swing sorting the threshed material leaked from the receiving net by swinging in the front-rear direction is provided, and the arm is a first arm member attached to the support and the swing sorting unit. It is preferable to have a second arm member attached to the portion and rotatably attached to the first arm member, and the sieve wire is attached to the second arm member. According to such a configuration, the sieve wire can be swung by rotating the second arm member with respect to the first arm member attached to the support while swinging together with the swing sorting portion. ..

It is preferable to provide a protective cover arranged so as to cover the arm. This prevents the threshed product leaked from the receiving net from coming into contact with the arm, and more reliably prevents the threshed product from wrapping around.

When it has an opening for the handling cylinder to face laterally outward on one side on the left and right sides where the support to which the arm is attached is provided, and a threshing side cover provided so as to be openable and closable with respect to the opening. Is excellent in workability when performing maintenance of the arm.

Left side view of combine Right side view of the combine Plan view of combine The figure which shows the threshing apparatus and the sorting apparatus Perspective view of the swing sorting unit Perspective view showing the peripheral part of the sieve line Perspective view showing the peripheral part of the sieve line Floor plan of the sieve line (A) Side view of the sieve line in the first posture, and (b) Side view of the sieve line in the second posture.

An example of the combine according to the present invention will be described. First, the overall structure of the combine will be briefly explained. Next, the threshing device and the sorting device included in the combine will be described, and then the support structure of the sieve wire will be described in detail.

[Overall structure of combine harvester]
1 to 3 show the left side surface, the right side surface, and the plane of the combine 100 of the present embodiment, respectively. In the figure, the front-back direction, the left-right direction, and the up-down direction of the combine 100 are indicated by arrows. The combine 100 includes a traveling device 1, a harvesting device 2, a threshing device 3, a sorting device 4, a storage device 5, and a power device 6.

The traveling device 1 is provided below the machine frame 10. The traveling device 1 includes a transmission 11 and a pair of left and right crawler devices 12. The transmission 11 transmits the power of the power device 6 mounted on the airframe frame 10 to the crawler device 12. The crawler device 12 causes the combine 100 to travel in the front-rear direction and turns the combine 100 in the left-right direction.

The cutting device 2 is provided in front of the traveling device 1. The cutting device 2 includes a reel 21, a cutter (cutting blade) 22, an auger (horizontal feed screw) 23, and a conveyor 24. The reel 21 guides the grain culm in the field to the cutter 22 by rotating. The cutter 22 cuts the grain guided by the reel 21. The auger 23 collects the culms cut by the cutter 22 at a predetermined position (the culm supply port of the conveyor 24). The transport conveyor 24 transports the grain culms collected by the auger 23 to the front rotor 33 (see FIG. 4) of the threshing device 3.

The threshing device 3 is provided behind the harvesting device 2. The threshing device 3, which is a threshing unit, has a handling cylinder 31. The handling cylinder 31 is housed in the handling chamber 30 (see FIG. 4). The handling cylinder 31 rotates to carry the culm backward while threshing the culm. Further, the threshing device 3 has a receiving net 32 provided below the handling cylinder 31. The receiving net 32 supports the culm transported by the handling cylinder 31, and drops the threshed product onto the sorting device 4. Below the handling cylinder 31, a first conveyor 143 and a second conveyor 144 (see FIG. 4), which are screw conveyors for transporting grains, are provided. All of these transport the threshed grains in the horizontal direction.

The sorting device 4 is provided below the threshing device 3. The sorting device 4 has a swing sorting unit 41 that swings and sorts the threshed product leaked from the receiving net 32 by swinging in the front-rear direction. The grains sorted by the rocking sorting unit 41 are conveyed by the first conveyor 143 and the frying conveyor 151, and are charged into the grain tank 51 via the charging port 153. Further, the sorting device 4 has a blowing unit 42 that sends wind toward the rocking sorting unit 41. The blower 42 blows away impurities such as straw debris contained in the threshed product. Contaminants such as straw debris are discharged to the outside from the culm outlet 45 provided at the rear of the sorting device 4.

The storage device 5 is provided on the right side of the threshing device 3 and the sorting device 4. The threshing device 3, the sorting device 4, and the storage device 5 are arranged in parallel on the left and right above the machine frame 10. The storage device 5 includes a grain tank 51 for storing grains. The grain tank 51 stores the grains conveyed from the sorting device 4 via the first conveyor 143 and the grain raising conveyor 151. When discharging the grains in the grain tank 51, the discharge auger 52 is used. The discharge auger 52 is configured to be rotatable in the vertical and horizontal directions, and grains can be discharged to any place.

The power device 6 is provided below the operating unit 13 and in front of the storage device 5. The power unit 6 is composed of an engine 61. The engine 61 of the present embodiment is a diesel engine, and converts heat energy obtained by burning fuel into kinetic energy. More specifically, the engine 61 converts the heat energy obtained by burning the fuel into the power for driving each part such as the traveling device 1. The power device 6 may be an electric motor that generates power by electricity. Further, the power unit 6 may include both an engine 61 and an electric motor.

The driving unit 13 is provided in front of the Glen tank 51 on the right front side of the machine frame 10. In the driver unit 13, a driver's seat 14 on which the operator sits and a steering handle 15 arranged in front of the driver's seat 14 are installed, and various operating tools such as a speed change lever, a clutch lever, and switches are installed around them. Is placed.

[Threshing device]
As shown in FIG. 4, the threshing device 3 has a handling chamber 30, a handling cylinder 31, a receiving net 32, and a front rotor 33. The handling chamber 30 is partitioned by a receiving net 32, a machine frame 300, an upper cover 301, and the like. The machine frame 300 includes an upper cover 301 arranged above the handling cylinder 31, a front wall member 302 arranged in front of the handling cylinder 31, and a rear wall member 303 arranged behind the handling cylinder 31. A right side wall member 304 arranged on the right side of the handling cylinder 31 is attached. The grain culm conveyed by the conveyor 24 is sent into the handling chamber 30 by the front rotor 33. The front rotor 33 not only conveys the grain culm, but also has a function of performing preliminary threshing (pre-threshing).

The handling cylinder 31 has a handling cylinder shaft 311 extending in the front-rear direction, a scraping screw 312, and a tooth bar (tooth handling support member) 313. The handling cylinder 31 rotates about the handling cylinder shaft 311. The handling barrel shaft 311 is rotatably supported by the front wall member 302 and the rear wall member 303. The rotational power from the engine 61 is transmitted to the handling barrel shaft 311. The handling barrel shaft 311 is a linearly formed structure, and supports the scraping screw 312 and the plurality of tooth bars 313.

The scraping screw 312 is arranged at the front portion of the handling cylinder 31. The scraping screw 312 is a structure in which a spiral impeller (scraping blade) 312b is detachably formed. The scraping screw 312 scrapes the culm sent by the front rotor 33. That is, the scraping screw 312 takes in the grain culm sent by the front rotor 33 and sends it out to the rear by rotating. The scraping screw 312 is not limited to the structure in which the spiral impeller 312b is formed, and may be a structure in which a plurality of blades are formed.

Behind the scraping screw 312, a plurality of tooth bars 313 are arranged around the handling barrel shaft 311. The tooth bar 313 is a structure in which a plurality of handling teeth 313t are arranged in parallel with each other at predetermined intervals. The tooth bar 313 threshs the culm sent out by the scraping screw 312. That is, the tooth bar 313 rotates to knead the culm sent out by the scraping screw 312 and hit it again to drop threshing. The tooth bar 313 is not limited to a structure having a plurality of handling teeth 313t, and may be a structure having a spiral blade. In the present embodiment, the plurality of tooth bars 313 and the plurality of plate members 314 provided over the tooth bars 313 form a cylindrical shape as a whole by separating the internal space of the handling cylinder 31 and the external space of the handling cylinder 31. Although it constitutes a rotating body, a cylindrical rotating body may be provided with a plurality of handling teeth 313t.

The receiving net 32 is provided along the lower outer peripheral surface of the handling cylinder 31, and is formed in a substantially U shape when viewed from the front-rear direction. In the present embodiment, the receiving net 32 is arranged so as to cover the lower part of the rotating body composed of the plurality of tooth bars 313. The catch net 32 supports the culm rubbed by the tooth bar 313. The receiving net 32 is mainly composed of a net body 321. The net body 321 is a structure in which wires are stretched in parallel at predetermined intervals. The receiving net 32 leaks the threshed product that has been threshed by the handling cylinder 31 through the gap of the net body 321. The receiving net support frame 36 supports the receiving net 32 from below. The net support frame 36 extends in the front-rear direction at the center of the threshing device 3 in the width direction.

The threshing device 3 has an opening 34 (see FIGS. 6 and 7) that allows the handling cylinder 31 to face laterally outward on the left side, and a threshing side cover 35 (FIGS. 1 and 3) that is openably and closably provided with respect to the opening 34. See) and. The left side of the handling cylinder 31 is covered with a threshing side cover 35. The threshing side cover 35 is attached to the machine frame 300 so as to be able to swing up and down between the closed position where the opening 34 shown in FIGS. 1 and 3 is closed and the open position where the opening 34 is opened. Therefore, the opening 34 can be opened and closed by swinging the threshing side cover 35 up and down. By opening the threshing side cover 35, the operator can perform maintenance such as the handling cylinder 31 and the receiving net 32 from the opening 34.

[Sorting device]
As shown in FIG. 4, the sorting device 4 includes a swing sorting unit 41 and a blowing unit 42. The rocking sorting unit 41 sorts grains by sieving the threshed product. The blower 42 selects grains by blowing off impurities such as straw debris contained in the threshed product.

As shown in FIG. 5, the swing sorting unit 41 includes a feed pan 411, a chaff sheave 412, a straw rack 413, a sieve wire 414, and a swing frame 415. The feed pan 411, the chaff sheave 412 and the straw rack 413 are attached to the swing frame 415. A chaff sheave 412 is arranged at the lower rear portion of the feed pan 411, and a straw rack 413 is arranged behind the chaff sheave 412. The sieving line 414 is located behind the feed pan 411 and above the chaff sheave 412. The sieve wire 414 is supported by an arm 7 attached to a threshing side plate 37 (see FIGS. 6 and 7) as a support, as will be described later.

An eccentric cam type swing drive mechanism 410 that swings back and forth in conjunction with the rotation of the shaft 41a extending in the left-right direction is provided below the rear portion of the swing sorting unit 41. The swing sorting unit 41 is configured to be swingable back and forth by the swing drive mechanism 410. The rocking sorting unit 41 is arranged between the left and right threshing side plates 37 and 38 (see FIG. 6), which are not shown in FIG. A rubber sheet 418 is attached to the upper edge of the swing frame 415 via a bracket 417 so that the threshed product does not fall out from the gap between the swing sorting portion 41 and the threshing side plates 37 and 38.

The feed pan 411 is a wide and flatly formed structure. The feed pan 411 receives the threshed product that has fallen from the receiving net 32. The feed pan 411 swings back and forth to move the threshed product on the feed pan 411 backward while leveling it. At this time, the threshed product is evenly spread in the left-right direction by the slanted fins 411f.

The chaff sheaves 412 have a plurality of sheave plates 412p arranged parallel to each other at predetermined intervals. The plurality of sheave plates 412p are arranged side by side in the front-rear direction while extending along the left-right direction. The angle of the sheave plate 412p can be adjusted according to the amount of threshed product. By rocking back and forth, the chaf sheave 412 sifts the threshed product sent from the feed pan 411 to raise the contaminated contaminants and separate them from the grains. The threshed product (only grains) sorted by the chaff sheave 412 passes through the sieve net 416, is guided by the first-class grain plate 431, falls to the first gutter 43, and is dropped by the first conveyor 143. Be transported. The threshed product remaining on the chaf sheave 412 moves backward and is sent to the straw rack 413.

The straw rack 413 has a plurality of rack plates 413p arranged in parallel with each other at predetermined intervals. By rocking back and forth, the straw rack 413 screens the threshed product sent from the chaf sheave 412 to support the relatively large contaminants mixed in and separate it from the grains. The threshed product (grains and a few small impurities) sorted by the straw rack 413 is guided by the second stream grain plate 441 and falls to the second gutter 44, and is sorted by the second conveyor 144. It is reduced and conveyed to the front end side of the apparatus 4, and is subjected to the sorting process again. The threshed product remaining on the straw rack 413 moves backward and is discharged to the outside.

The sieving wire 414 has a plurality of wire rods 414s arranged in parallel with each other at predetermined intervals. The sieving line 414 swings in the front-rear direction to sieve the threshed product sent from the feed pan 411, catches the relatively large contaminants mixed in the threshed product, and separates them from the grains. do. The threshed product sorted by the sieving line 414 (which is a grain and a large number of small contaminants) falls on the chaff sheave 412 and is further screened and sorted. In this way, the threshed product received by the feed pan 411 is auxiliary shake-sorted by the sieve line 414 before reaching the chaff sheave 412.

The blower unit 42 is arranged below the front portion of the rocking sorting unit 41, and supplies the sorting air toward the rocking sorting unit 41. The blower portion 42 includes a fan 421 and a fan case 422. In the present embodiment, the fan 421 is arranged below the feed pan 411, and the fan case 422 is arranged so as to cover the fan 421. The fan 421 has a plurality of fan plates 421p mounted at a predetermined angle. The fan 421 rotates and blows out the air to blow off the contaminants on the chaff sheave 412 and the straw rack 413 and the contaminants that have fallen from them. The fan case 422 is a structure formed by bending a plate material. The fan case 422 covers the fan 421 and guides the wind sent by the fan 421 in a predetermined direction.

[Support structure of sieve wire]
FIG. 6 shows a threshing device 3 in a state where the handling cylinder 31, the receiving net 32, the upper cover 301, the right side wall member 304, and the like are removed. FIG. 7 shows a threshing device 3 in a state where the threshing side cover 35 and the like are further removed. The net support frame 36 extends in the front-rear direction at the center of the threshing device 3 in the width direction. The machine wall on the left side of the threshing device 3 is mainly composed of a threshing side cover 35 and a threshing side plate 37. The threshing side plate 37 is provided at the lower left side of the handling chamber 30. The machine wall on the right side of the threshing device 3 is mainly composed of a right side wall member 304 and a threshing side plate 38. The threshing side plate 38 is provided at the lower right side of the handling chamber 30. The threshing side plates 37 and 38 each form a part of the machine frame 300, and even if the swing sorting unit 41 swings, they do not swing.

In the present embodiment, the threshing side plate 37 provided on one left and right side (the left side in the present embodiment) of the threshing device 3 which is the threshing portion is used as a support, and the threshing wire 414 is attached to the threshing side plate 37. It is supported by the arm 7 so as to be swingable in the front-rear direction with respect to the threshing side plate 37. The arm 7 is arranged below the receiving net 32 together with the sieving wire 414. Since the amount of leakage of the threshed product leaking from the receiving net 32 is large at the central portion in the width direction of the threshing device 3 and small at the end portion in the width direction of the threshing device 3, a sieve line is used by the arm 7 attached to the threshing side plate 37. By supporting the 414, it is possible to prevent the threshing product from being wrapped around the arm 7. In addition, another sieve wire may or may not be attached to the rear end portion of the feed pan 411.

The arm 7 has a first arm member 71 attached to the threshing side plate 37, and a second arm member 72 attached to the swing sorting unit 41 and rotatably attached to the first arm member 71. .. The sieve wire 414 is attached to the second arm member 72. The arm 7 is attached to the threshing side plate 37 that does not swing, but the second arm member 72 swings together with the swing sorting unit 41 with respect to the first arm member 71 attached to the threshing side plate 37. By rotating, the sieve wire 414 can be swung. In the present embodiment, the first arm member 71 and the second arm member 72 are each made of a plate material with the out-of-plane direction facing left and right.

As shown in FIGS. 7 to 9, the first arm member 71 rotates relative to one end 71a attached to the threshing side plate 37 so as to be relatively rotatable with respect to one end 72a of the second arm member 72. It has a possiblely attached other end 71b. The first arm member 71 rotates with respect to the threshing side plate 37 with the rotation shaft 73 as a fulcrum. The rotating shaft 73 is fixed to the threshing side plate 37 via a bracket 74, and is connected to one end 71a of the first arm member 71 via a bearing 75. The second arm member 72 rotates with respect to the first arm member 71 with the rotation shaft 76 as a fulcrum. The rotation shaft 76 is fixed to the other end 71b of the first arm member 71 and is connected to one end 72a of the second arm member 72 via a bearing 77.

The second arm member 72 has one end portion 72a rotatably attached to the other end portion 71b of the first arm member 71 and the other end attached to the swing sorting portion 41 (sieving line 414). It has a portion 72b. The other end 72b of the second arm member 72 is fixed to the sieve line 414, and is fixed by welding in this embodiment. The arm 7 extends in the front-rear direction in a plan view, extends rearward from one end 71a of the first arm member 71, and reaches the other end 72b of the second arm member 72. The length between both ends of the second arm member 72 is smaller than the length between both ends of the first arm member 71, so that when the swing sorting unit 41 is attached to the threshing machine frame, the arm 7 I try not to get in the way by hanging down. The other end 72b of the second arm member 72 may be fixed to the sieve wire 414 by a fastening member such as a bolt.

The sieve wire 414 is rotatably supported with the rotation shaft 414a extending in the left-right direction as a fulcrum. As shown in FIG. 8, a pair of pedestals 412s and 412s for axially supporting both ends of the rotating shaft 414a are attached to the chaff sheave 412. The pair of pedestals 412s and 412s each support the rotation shaft 414a via the bearing 412b. In areas where high durability is strongly required, such as areas where there is a lot of sand in the field, it is possible to achieve high durability with this configuration. In areas where high durability is not strongly required, the bearing 412b is provided on only one of the pair of pedestals 412s and 412s, and the other is made of resin without using the bearing 412b and the rotating shaft 414a. May be rotatably supported, or both of the pair of pedestals 412s and 412s may be made of resin to rotatably support the rotating shaft 414a. The cost can be reduced by adopting a structure in which the bearing 412b is rotatably supported by a resin without using the bearing 412b. Further, in the present embodiment, the pedestal 412s is fixed to the chaff sheave 412, but the present invention is not limited to this, and for example, it can be fixed to the swing frame 415.

In the present embodiment, the sieve line 414 swings in the vertical direction about the rotation shaft 414a in response to the swing in the front-rear direction of the swing sorting unit 41, and the posture of the sieve line 414 is shown in FIG. 9 (a). ) And the second posture shown in FIG. 9B. The first posture is the posture when the swing sorting unit 41 is positioned in the front, and the second posture is the posture when the swing sorting unit 41 is positioned in the rear. In the second posture, the sieve line 414 is in a state of rising backward (front low and rear height), and the rear end portion of the sieve line 414 is higher than the front end portion of the sieve line 414. Therefore, the threshed product on the sieving line 414 can be thrown up to enhance the sorting effect.

In the first posture, the sieve line 414 is in a state of lowering backward (front high and rear low), and the rear end portion of the sieve line 414 is lower than the front end portion of the sieve line 414. Therefore, the threshed product can be appropriately sent backward without blocking the transport of the threshed product on the sieve line 414. As described above, in the present embodiment, the sieve line 414 moves backward when the swing sorting unit 41 is located in the front, and the sieve line 414 moves backward when the swing sorting unit 41 is located in the rear. , These may be reversed. Further, from the viewpoint of not hindering the transportation of the threshed product, it is preferable that the sieve line 414 is in a backward lowered state as shown in FIG. 9A in at least one of the first posture and the second posture. ..

As shown in FIG. 6, the combine 100 of the present embodiment includes a protective cover 81 arranged so as to cover the arm 7. As a result, the threshed product leaked from the receiving net 32 can be prevented from coming into contact with the arm 7, and the wrapping of the threshed product can be more reliably prevented. The protective cover 81 is formed in a plate shape, but is not limited to this. The protective cover 81 is detachably attached to the inner surface of the threshing side cover 35, and when the threshing side cover 35 is removed, the protective cover 81 is also removed. The protective cover 81 protrudes significantly toward the central portion in the width direction of the threshing device 3 as compared with the protective covers 82 and 83 that protect the power transmission system such as a chain or a belt. Although not shown, such a protective cover is provided on the side opposite to the left and right sides on which the arm 7 is located (on the right side in this embodiment) for the purpose of protecting the shaft support portion of the rotating shaft 414a. Has been done.

As described above, the threshing device 3 has an opening 34 for the handling cylinder 31 to face laterally outward, and a threshing side cover 35 provided so as to be openable and closable with respect to the opening 34. As shown in FIGS. 6 and 7, the opening 34 causes the handling cylinder 31 to face laterally outward on the left side, which is one side on the left and right sides where the threshing side plate 37 to which the arm 7 is attached is provided. According to this configuration, when the threshing side cover 35 is opened, the sieve line 414 is located on the front side of the operator, so that the workability when performing maintenance on the arm 7 is excellent.

In the present embodiment, an example in which the arm 7 is attached with the threshing side plate 37 provided on the left side of the threshing device 3 as a support is shown, but the present invention is not limited to this, and the threshing side plate provided on the right side of the threshing device 3 is not limited to this. The arm 7 may be attached with the 38 as a support. Further, the support to which the arm 7 is attached is not limited to the threshing side plates 37 and 38, but may be other fixing members (members that do not swing in response to the swing of the swing sorting unit) located on the side of the threshing device 3. I do not care.

In the present embodiment, an example of a conventional combine is shown, but the present invention is not limited to this, and the present invention may be a head-feeding combine.

The present invention is not limited to the above-described embodiment, and various improvements and changes can be made without departing from the spirit of the present invention.

3 Threshing device (threshing department)
4 Sorting device 7 Arm 31 Handling cylinder 32 Receiving net 34 Opening 35 Threshing side cover 36 Receiving net support frame 36 Threshing side plate (example of support)
37 Threshing side plate 41 Swing sorting part 71 1st arm member 72 2nd arm member 81 Protective cover 100 Combine 411 Feed pan 412 Chaf sheave 414 Sifting wire

Claims (2)

A threshing part with a handling body,
Supports provided on one side of the threshing section on the left and right sides,
The receiving net provided below the handling cylinder and
A swing sorting unit that swings and sorts the threshed material leaked from the receiving net by swinging in the front-back direction.
Equipped with
The rocking sorting unit is
A feed pan that catches the threshed material that has fallen from the receiving net,
A sieve line provided behind the feed pan and adjacent to the feed pan and supported so as to be swingable in the front-rear direction with respect to the support by an arm attached to the support.
It has a pedestal that rotatably supports the sieve wire, and has.
The arm
The first arm member attached to the support and
It has a second arm member attached to the swing sorting portion, rotatably attached to the first arm member, and to which the sieve wire is attached.
The pedestal is provided on the outer side in the left-right direction with respect to the second arm member.
The threshing section
An opening that allows the handling body to face laterally outward on one side on the left and right sides where the support to which the arm is attached is provided.
It has a threshing side cover that can be opened and closed with respect to the opening.
A protective cover is attached to the inner surface of the threshing side cover toward the center in the width direction of the threshing portion.
The protective cover is a combine that is arranged so as to cover the first arm member and the second arm member . The combine according to claim 1 , wherein the first arm member and the second arm member fixed to the sieve wire are each made of a plate material with the out-of-plane direction facing left and right.

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