JP4783251B2 - Combine grain discharge auger - Google Patents

Description

  The present invention relates to a combine grain discharge auger provided with an expansion / contraction mechanism and configured to be expandable / contractible.

  As a conventional technique, for example, a combine grain discharging auger disclosed in Patent Document 1 is known. In the conventional grain discharge auger disclosed in Patent Document 1, a spiral wing body with a shaft (Patent Document 1 of Patent Document 1) is obtained by a blade rotating means (60 in FIG. 2 of Patent Document 1) interlocked with the vertical auger. 2 is rotated and the motor (64 in FIG. 2 in Patent Document 1) is rotated forward and backward to drive the drive shaft (65 in FIG. 2 in Patent Document 1) and the differential gear mechanism (Patent Document). 2 of FIG. 2 of FIG. 1 is rotated at a rotational speed different from that of the spiral wing body with a shaft through the shaft-less spiral wing body (31 of FIG. 2 of Patent Document 1). The grain discharge auger is configured to expand and contract by moving the shaftless spiral blade relative to the shafted spiral blade using the difference in the rotational speed of the spiral blade. Further, when the shaftless spiral blade body is moved relative to the shafted spiral blade body, the shaftless spiral blade body cover (Patent Document 1 of FIG. 37) of FIG. 2 moves, and the spiral wing body cover with shaft and the non-spiral wing body cover are configured to expand and contract.

JP 2002-186345 A (see FIGS. 2 to 5 and FIG. 14)

In the conventional combine grain discharging auger disclosed in Patent Document 1, a spiral wing body with shaft and a non-spiral wing body (31 and 34 in FIG. 2 of Patent Document 1) are rotated at different rotational speeds. In order to drive, it was necessary to provide a differential gear mechanism (62 in FIG. 2 of Patent Document 1) and the like at the tip of the grain discharge auger. For this reason, the structure of the grain discharge auger becomes complicated, which increases the number of parts and contributes to an increase in manufacturing cost, and the weight of the grain discharge auger (particularly, the tip portion provided with the differential gear mechanism) There is a problem that an excessive bending moment is easily applied to the turning portion of the grain discharge auger.
An object of the present invention is to realize a combine grain discharge auger that is excellent in durability and stretchable at low cost.

[I]
(Constitution)
The first feature of the present invention includes a cylindrical first case, a cylindrical second case configured to be slidable with respect to the first case, and the first case and the second case. A first screw located on the upstream side of the transport and a second screw located on the downstream side of the transport inside the first and second cases, and a first screw of the first screw. The winding direction of one screw blade and the winding direction of the second screw blade of the second screw are set to be the same winding direction, and the second case is supplied from a supply port located at the upstream end of the first case. In the combine grain discharge auger that is configured to be able to convey the grain toward the discharge port located at the end portion on the downstream side of the conveyance and extend and contract, it is configured as follows.
When the first and second cases are expanded and contracted by the expansion and contraction mechanism, a slide mechanism is provided that slides the second screw relative to the first screw while overlapping the first screw .
The first and second cases are provided with a drive shaft concentric with the first and second cases, and the drive shaft is provided with the first and second screws on the outer periphery.
The first screw is configured to include a first cylinder shaft that is rotatable relative to the drive shaft provided on an outer peripheral portion of the drive shaft, and the first screw blade.
An end portion on the upstream side of conveyance of the first screw blade is fixed to an end portion on the upstream side of the outer peripheral portion of the first cylindrical shaft, and a predetermined interval is provided from the outer peripheral surface of the first cylindrical shaft. Wrap the screw blades spirally toward the downstream side of conveyance,
The second screw is externally fitted to the drive shaft, and an intermediate shaft that can rotate integrally with the drive shaft and is slidable relative to the drive shaft, and a predetermined interval from an outer peripheral surface of the intermediate shaft. A second cylinder shaft that can rotate integrally with the provided intermediate shaft, and the second screw blade;
The second screw blade is spirally wound around and fixed to the outer periphery of the second cylindrical shaft,
The slide mechanism is configured by fitting the first cylindrical shaft of the first screw between the intermediate shaft and the second cylindrical shaft of the second screw.

(Function)
According to a first aspect of the present invention, there is provided a slide mechanism that slides the second screw with respect to the first screw while overlapping the first screw when the first and second cases are expanded and contracted by the expansion / contraction mechanism. By providing, the second screw can be slid with respect to the first screw by extending and contracting the first and second cases by the expansion / contraction mechanism without driving the first and second screws to rotate. Thus, the grain discharge auger can be expanded and contracted. Therefore, the structure for expanding and contracting the grain discharge auger can be simplified.

Specifically, for example, the shaft-less spiral wing body in Patent Document 1 (31 in FIG. 2 of Patent Document 1) is rotationally driven at a different rotational speed from the shaft-equipped spiral wing body (34 in FIG. 2 in Patent Document 1). In place of the drive shaft (65 in FIG. 2 of Patent Document 1) and the differential gear mechanism (62 in FIG. 2 of Patent Document 1) for expanding and contracting, a telescopic mechanism (for example, FIG. 2) spans the first case and the second case. 3) and a slide mechanism (for example, 40, 41 in FIG. 3, etc.), the grain discharge auger can be expanded and contracted. Therefore, the structure for expanding and contracting the grain discharge auger is simpler than the structure of Patent Document 1. Can be
According to the first feature of the present invention, by configuring the first and second screws and the like as described above, the slide mechanism in which the second screw slides relative to the first screw while overlapping the first screw is simplified. Can be realized. Further, by adopting a configuration in which the first cylindrical shaft of the first screw is fitted between the intermediate shaft of the second screw and the second cylindrical shaft as described above, the second screw is attached to the first screw. Can be slid without difficulty. That is, by configuring the slide mechanism as described above, it is possible to simply realize a slide mechanism that can easily slide the second screw relative to the first screw.

(The invention's effect)
According to the 1st characteristic of this invention, since the structure which expands and contracts a grain discharge auger can be simplified, a number of parts can decrease and manufacturing cost can be reduced. In addition, as a result of simplifying the structure for expanding and contracting the grain discharge auger, the weight of the grain discharge auger is reduced, so that an excessive bending moment is difficult to work on the turning part of the grain discharge auger, A grain discharge auger with excellent durability can be realized.
According to the first feature of the present invention, it is possible to simply realize a slide mechanism that can easily slide the second screw relative to the first screw, thereby improving the durability of the grain discharge auger. And manufacturing cost can be reduced.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration of the combine grain discharge auger of the first feature of the present invention.
When the first and second cases are shortened by the expansion and contraction mechanism and the second screw is slid and moved upstream of the first screw, the first screw is moved to the second screw. A rotation mechanism is provided that rotates relative to the direction opposite to the direction of conveyance to the discharge port.

(Function)
According to the second feature of the present invention, the “action” described in the preceding item [I] is provided in the same manner as the first feature of the present invention, and in addition to this, the following “action” is provided.
For example, in the combine grain discharge auger disclosed in Patent Document 1, the difference in the rotational speeds of the spiral wing body with shaft and the non-spiral wing body with shaft (31 and 34 in FIG. 2 of Patent Document 1) is used. It is configured to expand and contract the grain discharge auger while rotating the spiral spiral wing with shaft and the non-spiral spiral wing in the direction of conveying the grain to the discharge port. . When expanding and contracting the grain discharge auger, if the spiral wing with shaft and the non-spiral spiral wing rotate in the direction of conveying the grain to the discharge port, the spiral wing cover with shaft and the non-spiral wing cover (patent document) 2 and 36) in FIG. 2 in the middle of conveyance from the outlet while the grain discharging auger is being expanded and contracted by the rotation of the axial spiral wing body and the shaft non-spiral wing body. It will be discharged. Therefore, for example, in the case where the grain discharge auger is expanded or contracted in accordance with the position of the truck bed or the like that discharges the grain, the grain cannot be accurately discharged to the truck bed or the like. There was a problem that a grain loss that would cause the grain to be accidentally discharged to the outside of the loading platform or the like occurred. In addition, as a result of the grain being discharged from the outlet while the grain discharge auger is being expanded and contracted, it is difficult to expand and contract the grain discharge auger, and the workability of the grain discharge work is poor was there.

  According to the second feature of the present invention, when the first and second cases are shortened by the expansion / contraction mechanism and the second screw is slid to the transport upstream side with respect to the first screw, the first screw is moved with respect to the second screw. When the telescopic mechanism is shortened by providing a rotation mechanism that relatively rotates in the direction opposite to the direction in which the grain is conveyed to the outlet, the first screw is opposite to the direction in which the grain is conveyed to the outlet. The grain in the middle of the conveyance which exists in the grain discharge auger in the position where the 1st screw is arranged can be conveyed toward the conveyance upstream. Therefore, when shortening an expansion-contraction mechanism, the grain in the middle of conveyance is less conveyed toward the discharge port located in the conveyance downstream.

(The invention's effect)
According to the second feature of the present invention, the “effect of the invention” described in the preceding item [I] is provided in the same manner as the first feature of the present invention. In addition, the following “effect of the invention” is provided. ing.
According to the second feature of the present invention, when the telescopic mechanism is expanded and contracted, it is less likely that the grain in the middle of conveyance is conveyed toward the discharge port located on the downstream side of the transfer. The grain loss that the grain is accidentally discharged to the outside of the can be reduced. Further, as a result of reducing the grain loss, the grain discharge auger can be easily expanded and contracted, and the workability of the grain discharge operation can be improved.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the combine grain discharge auger of the first feature or the second feature of the present invention.
When the first and second cases are expanded and contracted by the expansion / contraction mechanism and the second screw slides relative to the first screw, the first screw blades of the first screw are adjacent to each other. The slide mechanism is configured to move while rotating around the center of the two screw blades.

(Function)
According to the third feature of the present invention, the “action” described in the preceding item [I] [II] is provided in the same manner as the first feature or the second feature of the present invention. Is provided.
For example, in a combine grain discharging auger disclosed in Patent Document 1, a spiral blade of a shaftless spiral blade body and a spiral blade of a spiral blade body with a shaft (30 and 32 in FIG. 5 of Patent Document 1) are provided. The structure which expands and contracts a grain discharge auger in the state which adjoined mutually is employ | adopted. Therefore, if there is a grain in the middle of conveyance between the spiral blade of the shaftless spiral blade and the spiral blade of the shaft-equipped spiral blade, or between the guide plate (35 in FIG. 3 of Patent Document 1) and the spiral blade. When the grain discharge auger is expanded and contracted, the grain in the middle of conveyance is compressed between the spiral wing of the shaft-free spiral wing and the spiral wing of the shaft-equipped spiral wing, and the grain is compressed and damaged. There was a problem such as. Furthermore, when the grain discharge auger is expanded and contracted, a large frictional force acts between the spiral wing of the shaft-free spiral wing body and the spiral wing of the shaft-equipped spiral wing body, so that the grain discharge auger can be expanded and contracted without difficulty. There was a problem that I couldn't.

  According to the third aspect of the present invention, when the first and second cases are expanded and contracted by the expansion / contraction mechanism and the second screw slides relative to the first screw, the first screw blades of the first screw are adjacent to each other. By configuring the slide mechanism so as to move while relatively rotating around the center of the second screw blade of the screw, the first screw blade of the first screw and the second screw blade of the second screw are separated from each other. The grain discharge auger can be expanded and contracted. Therefore, when expanding and contracting the grain discharge auger, it is possible to prevent the grain in the middle of conveyance between the first screw blade of the first screw and the second screw blade of the second screw from being compressed, and the first The frictional force becomes difficult to work between the screw blade and the second screw blade.

(The invention's effect)
According to the third feature of the present invention, the “effect of the invention” described in the preceding paragraphs [I] and [II] is provided in the same manner as the first feature or the second feature of the present invention. “Effect of the invention” is provided.
According to the third feature of the present invention, when the grain discharge auger is expanded and contracted, the grain can be prevented from being compressed, so that the grain can be prevented from being damaged. Moreover, since it becomes difficult for a friction force to work between a 1st screw blade | wing and a 2nd screw blade | wing, a grain discharge auger can be expanded-contracted without difficulty.

[Overall structure of the combine]
FIG.1 and FIG.2 shows the self-decomposing combine provided with the grain discharge auger according to the present invention. As shown in FIG.1 and FIG.2, the cutting part 3 is provided in the front part of the traveling body 2 provided in the upper part of the crawler traveling apparatus 1, and the traveling part 2 threw and sorts the control part 4 and the harvested grain straw. The self-decomposing combine is configured with a threshing unit 5 that performs, a grain tank 6 that stores the grain supplied from the threshing unit 5, an unloader 7 that discharges the grain out of the machine from the grain tank 6, and the like.

  The unloader 7 includes a vertical auger 8 that guides the grain upward from a discharge screw 11 at the lower part of the Glen tank 6 and a horizontal auger 9 that discharges the grain from the upper part of the vertical auger 8 to a truck bed (not shown). The lower case below the vertical auger 8 after the unloader 7 is erected by operating a hydraulic cylinder 12 provided between the vertical auger 8 and the horizontal auger 9. The unloader 7 can be turned by rotating the turning motor 13 provided at 14.

  The vertical auger 8 is rotatably connected to the lower case 14 connected to the rear end portion of the discharge screw 11 below the Glen tank 6, an outer case 15 extending upward from the lower case 14, and the outer case 15. It is configured to include a supported vertical feed screw 16 and the like, and is configured to be able to convey the grain conveyed rearward from the discharge screw 11 below the Glen tank 6 and supply it to the horizontal auger 9. Yes.

  The discharge screw 11 at the lower part of the Glen tank 6 is connected to the vertical feed screw 16 of the vertical auger 8 via the bevel transmission mechanism 17 inside the lower case 14, and the vertical feed screw 16 of the vertical auger 8 is connected to the upper case 18. Is coupled to a drive shaft 42 of a lateral auger 9 described later via a bevel transmission mechanism 19. By comprising in this way, the discharge screw 11 of the lower part of the Glen tank 6 rotates from an engine (not shown) via the transmission case (not shown) located between the Glen tank 6 and the threshing part 5. Then, the vertical feed screw 16 is rotated via the bevel transmission mechanism 17, and further, the first conveyance screw 20, the second conveyance screw 21 and the third conveyance screw 22 are rotated via the bevel transmission mechanism 19. It is configured.

  By comprising as mentioned above, the grain stored in the glen tank 6 is conveyed back to the machine body by the discharge screw 11, conveyed upward by the vertical auger 8, and supplied to the supply port 9a of the horizontal auger 9. The grain is guided to the discharge port 9b at the tip of the horizontal auger 9 by the first transfer screw 20, the second transfer screw 21 and the third transfer screw 22 provided inside the auger 9, and the loading platform of the truck etc. ( The unloader 7 is configured so that the grain can be discharged to a not shown.

[Structure of horizontal auger (equivalent to grain discharge auger)]
3 to 11 show the detailed structure of the horizontal auger 9. FIG. 3 shows an overall view of the horizontal auger 9. 3A shows a longitudinal sectional view of the horizontal auger 9 in the most extended state, and FIG. 3B shows a longitudinal sectional view of the lateral auger 9 in the most shortened state. 4 to 7 show detailed longitudinal sectional views of the horizontal auger 9 at positions A to D in the state of FIG. 3 (a), respectively, and FIGS. 8 to 10 show the state of FIG. 3 (b). The detailed vertical sectional view of the horizontal auger 9 in the position of EG in FIG. FIG. 11 is a cross-sectional view taken along the line XX in FIG.

  As shown in FIG. 3, the horizontal auger 9 includes a cylindrical first case 23 connected to an upper case 18 positioned at a connecting portion between the vertical auger 8 and the horizontal auger 9, and the first case 23 in a telescopic direction. A second case 24 fitted in a slidable manner, and a first transport screw 20, a second transport screw 21, a third transport screw 22 and the like provided in the first case 23 and the second case 24 are configured. Has been.

  As shown in FIG. 6, a cylindrical sleeve 25 is fixed to the outer peripheral portion of the upstream end of the second case 24 in a state of being fitted around the second case 24. The pipe 26 is fixed to the end on the upstream side of the conveyance in a state of being fitted inside, and the cylindrical sleeve 27 is fixed to the end of the pipe 26 on the upstream side of the conveyance in a state of being fitted. The sleeve 27 is tapered on the inner surface side at the upstream end of the conveyance, so that when the second case 24 slides relative to the first case 23, the first case 23 changes to the second case 24. It is configured to be able to guide the grain without difficulty. The sleeves 25 and 27 are fitted into the first case 23 via collars 28 and 29 provided on the outer periphery thereof, so that the second case 24 slides in the telescopic direction with respect to the first case 23 without difficulty. It is configured.

  As shown in FIG. 6 and FIG. 7, a flat bar 30 that is long in the expansion and contraction direction, which is grooved over the entire length, is fixed to the upper end portion of the second case 24, and the second case 24 is attached to the first case 24. The tip of the adjustment bolt 31 provided on the upper side of the end portion of the first case 23 on the downstream side of the first case 23 enters the groove 30a having a concave cross section formed in the flat bar 30 in a state of being fitted in the case 23. By attaching the adjusting bolt 31, the position where the second case 24 is expanded and contracted with respect to the first case 23 in the most contracted position and the most extended position can be regulated (see FIG. 11). On the other hand, a rack 32 in which a plurality of rack grooves 32a are processed over the entire length is fixed to the lower end portion of the second case 24, and is linked to a pinion gear 37 connected to an electric motor 35 described later. .

  As shown in FIG. 7, a discharge port 9 b opened downward is disposed at the end of the second case 24 on the downstream side of conveyance, and a first conveyance screw 20, a second conveyance screw 21, which will be described later, It is comprised so that the grain conveyed by the 3rd conveyance screw 22 can be discharged | emitted below from this discharge port 9b.

  As shown in FIGS. 4 and 5, the first transport screw 20 includes a first screw 40 positioned on the transport upstream side of the first case 23, a second screw 41 positioned on the transport downstream side of the first screw 40, and the like. It is prepared for.

  The drive shaft 42 is formed of a rod having a regular hexagonal cross-sectional shape, and is linked to the longitudinal feed screw 16 of the longitudinal auger 8 via a bevel transmission mechanism 19 provided in the upper case 18 to convey the drive shaft 42. The upstream end is rotatably supported by a bearing 43 provided in the bevel transmission mechanism 19, and the other end of the third cylinder shaft 56 of the third conveying screw 22 provided in the second case 24 described later. The nut member 56b on the upstream side of the conveyance is supported so as to be slidable in the extending and contracting direction (see FIG. 6).

The first screw 40 constituting the first transport screw 20 includes a first tube shaft 45 supported at the transport upstream end of the first case 23 via a bearing 44 so as to be rotatable relative to the drive shaft 42. The outer periphery of the first tube shaft 45 includes a spiral first screw blade 46 provided over the entire length of the first tube shaft 45. The first cylinder shaft 45 includes a first pipe 45a located on the upstream side of the conveyance, a second pipe 45b located on the conveyance downstream side of the first pipe 45a and having a smaller diameter than the first pipe 45a, and the second pipe 45b. An end portion of the first screw blade 46 on the upstream side of the first pipe blade 46a is formed by a cylindrical member 45c located on the downstream side of the conveyance and having a slightly larger outer diameter than the second pipe 45b. Is fixed, and the first screw blades 46 located in the portions of the second pipe 45b and the cylindrical member 45c having a small outer diameter are wound around the second pipe 45b and the cylindrical member 45c with a certain gap therebetween. Yes.

  The second screw 41 constituting the first conveying screw 20 can rotate integrally with the drive shaft 42 and is slidable in the expansion / contraction direction with respect to the drive shaft 42, and is fixed from the outer peripheral portion of the intermediate shaft 47. A second cylindrical shaft 48 concentric with the intermediate shaft 47 provided with a gap therebetween, and a spiral second screw blade 49 fixed to the outer peripheral portion of the second cylindrical shaft 48 over the entire length. It is configured.

  The intermediate shaft 47 is formed in a cylindrical shape, and nut members 47a each having a hexagonal hole are fixed to both ends thereof. By inserting the drive shaft 42 into the hexagonal hole of the nut member 47 a fixed to the intermediate shaft 47, the intermediate shaft 47 rotates together with the drive shaft 42, and the intermediate shaft 47 slides in the telescopic direction with respect to the drive shaft 42. Is configured to move.

  The second cylinder shaft 48 is connected to the intermediate shaft 47 by the connecting bolt 50 so as to be integrally rotatable. When the intermediate shaft 47 is rotated with respect to the drive shaft 42, the second cylinder shaft 48 is also integrally rotated. When the intermediate shaft 47 moves in the expansion / contraction direction with respect to 42, the second cylinder shaft 48 slides in the expansion / contraction direction.

  In the first cylinder shaft 45 described above, the cylindrical member 45c of the first cylinder shaft 45 is fitted on the intermediate shaft 47 of the second screw 41, and the cylindrical member 45c of the first cylinder shaft 45 is the second cylinder shaft. In a state of being fitted into the ring 48, it is fitted between the intermediate shaft 47 of the second screw 41 and the second cylinder shaft 48. Thus, the 1st screw blade 46 and the 2nd screw blade 49 are formed in the shape mentioned above, and the cylindrical member 45c of the 1st cylinder shaft 45 is made into the intermediate shaft 47 of the 2nd screw 41, and the 2nd cylinder shaft 48. A sliding mechanism that slides the second screw 41 with respect to the first screw 40 while being overlapped with the first screw 40 by being fitted therebetween is configured.

  A semicircular ball groove 47b is spirally formed on both ends in the expansion / contraction direction on the outer peripheral portion of the intermediate shaft 47, and a plurality of ball holes 45d are formed in the cylindrical member 45c of the first cylindrical shaft 45. In the state where the transmission ball 51 is attached across the ball groove 47b and the ball hole 45d, the first screw 41 of the second screw 41 is interposed between the intermediate shaft 47 of the second screw 41 and the second cylindrical shaft 48. A cylindrical shaft 45 is fitted.

  The pitch in the conveying direction of the spiral ball groove 47b formed on the outer peripheral portion of the intermediate shaft 47 is set at substantially the same interval as the screw pitch in the conveying direction of the first screw blade 46 and the second screw blade 49, Further, when the first screw 40 moves while rotating with respect to the second screw 41, the ball groove so that the first screw blade 46 moves at a substantially intermediate position of the screw pitch in the conveying direction of the second screw blade 49. 47b is processed.

  Thus, the pitch of the ball groove 47b of the intermediate shaft 47 and the screw pitch of the first screw blade 46 and the second screw blade 49 are set to be substantially the same, and the screw pitch in the transport direction of the second screw blade 49 is substantially the same. By configuring the intermediate screw position so that the first screw blade 46 moves, the first screw blade 46 of the first screw 40 and the second screw blade 49 of the second screw 41 when the first conveying screw 20 is expanded and contracted. A gap between the first screw blade 46 and the second screw blade 49 when the horizontal auger 9 is expanded and contracted, and the kernel is damaged. Can be prevented.

  As shown in FIGS. 3 and 8 to 10, by configuring the first conveying screw 20 as described above, the first and second cases 23 and 24 are expanded and contracted by the expansion and contraction mechanism 33 so that the second case 24 is expanded. When the first case 23 slides to the upstream side of the conveyance, the first cylindrical shaft 45 of the first screw 40 is guided between the intermediate shaft 47 of the second screw 41 and the second cylindrical shaft 48 to the ball groove 47b. The second screw 41 enters the second screw 41 while rotating relative to the second screw in the direction opposite to the direction in which the grain is conveyed to the discharge port 9b, and the first screw blade 46 of the first screw 40 is second. By entering relative to the second screw 41 between the screw pitches of the second screw blades 49 of the screw 41 and entering the second screw 41 while relatively rotating in the direction opposite to the direction in which the grain is conveyed to the discharge port 9b. The second Conveying screw 20 is configured to shorten. Thus, by the ball groove 47b of the intermediate shaft 47 formed in a spiral shape, the transmission ball 51 and the like, the first screw 40 is opposite to the second screw 41 in the direction opposite to the direction in which the grain is conveyed to the discharge port 9b. A rotation mechanism for relative rotation is configured.

On the other hand, when the first and second cases 23 and 24 are expanded and contracted by the expansion / contraction mechanism 33 and the second case 24 is slid to the transport downstream side with respect to the first case 23, the first cylindrical shaft 45 of the first screw 40 is moved. The second screw 41 is guided by the ball groove 47b between the intermediate shaft 47 and the second cylindrical shaft 48, and is transported upstream while rotating relative to the second screw 41 in the direction of transporting the grain to the discharge port 9b. The first screw blade 46 of the first screw 40 conveys the grain to the discharge port 9b with respect to the second screw 41 between the screw pitches of the second screw blades 49 of the second screw 41. The first conveying screw 20 is extended by moving relatively upstream in the direction while relatively rotating in the direction.

  Further, when the drive shaft 42 rotates without operating the telescopic mechanism 33 and the second screw 41 rotates, the force in the transport direction does not work, so the power of the drive shaft 42 is transmitted via the intermediate shaft 47 and the transmission ball 51. The second screw 41 is configured to rotate integrally with the first screw 40 by being transmitted to the cylindrical member 45 c of the first cylindrical shaft 45. Thus, the first screw 40 is configured to rotate integrally with the second screw 41 by the transmission ball 51, the ball groove 47b provided in the intermediate shaft 47, the ball hole 45d provided in the first cylindrical shaft 45, and the like. Accordingly, for example, the first and second screws 40 and 41 are rotated independently of each other, and the first and second screws 40 and 41 are rotated as compared with the case where the lateral auger 9 is configured to be extendable and retractable. It is not necessary to separately provide a mechanism for driving, and the mechanism for rotationally driving the first and second screws 40 and 41 can be simplified.

  In addition, a spiral ball groove 47 b is provided in the intermediate shaft 47 that rotates integrally with the drive shaft 42, and the first cylindrical shaft 45 in which the transmission ball 51 is provided between the intermediate shaft 47 and the second cylindrical shaft 48 is provided. By arranging the components, components such as the intermediate shaft 47, the transmission ball 51, and the cylindrical member 45c in which the ball groove 47b is processed can be accommodated in the second cylindrical shaft 48 of the second screw 41. Therefore, the dust and moisture of the grains passing through the horizontal auger 9 are less likely to adhere to the intermediate shaft 47 and the transmission ball 51 and can be slid and moved without difficulty, and the intermediate shaft 47 and the transmission ball 51 and the like It can prevent rusting.

  As shown in FIG. 4, in the state where the drive shaft 42 is rotated without operating the telescopic mechanism 33 and the grain is conveyed toward the discharge port 9b, the first screw blade 46 of the first screw 40 and The second screw blades 49 of the second screw 41 rotate in the direction in which the grain is conveyed to the discharge port 9b. However, when the first and second cases 23 and 24 are expanded and contracted by the expansion / contraction mechanism 33 and the second screw 41 moves to the upstream side of the conveyance relative to the first screw 40, the first screw 40 is guided by the ball groove 47b. The first screw blade 46 rotates in the direction opposite to the direction in which the grain is conveyed to the discharge port 9b. In other words, in a state where the first and second cases 23 and 24 are expanded and contracted by the expansion / contraction mechanism 33 to shorten the horizontal auger 9, the first screw 40 conveys the grain toward the supply port 9a side of the horizontal auger 9. Rotate in the direction.

  Therefore, even if the first conveying screw 20 is expanded and contracted and the first screw 40 is rotated with respect to the second screw 41, the grains are less likely to be supplied toward the discharge port 9b of the horizontal auger 9. Thus, by shortening the horizontal auger 9, it is possible to reduce the grain loss in which the grain is discharged from the discharge port 9b. In particular, when the drive shaft 42 is stopped and the second screw 41 is not rotating, the second screw 41 stops and only the first screw 40 conveys the grain toward the supply port 9a side of the lateral auger 9. Since the first and second cases 23, 24 are expanded / contracted by the expansion / contraction mechanism 33 and the horizontal auger 9 is expanded / contracted, the grains are discharged from the discharge port 9b. Loss can be further reduced.

As shown in FIGS. 5 and 6, the second transport screw 21 includes a first screw 40 and a second screw 41, similar to the first transport screw 20 described above, and the first and When the second cases 23 and 24 are expanded and contracted and the second case 24 slides and moves upstream of the first case 23, the first cylindrical shaft 45 of the first screw 40 and the intermediate shaft 47 of the second screw 41. The second screw 41 enters the second screw 41 while rotating relative to the second screw 41 in the direction opposite to the direction in which the grain is conveyed to the discharge port 9b by being guided by the ball groove 47b between the second cylindrical shaft 48 and the second screw shaft 48. Thus, the first screw blade 46 of the first screw 40 is opposite to the direction in which the grain is conveyed to the discharge port 9b with respect to the second screw 41 between the screw pitches of the second screw blade 49 of the second screw 41. Relative rotation By entering towards want the second screw 41, the second conveying screw 21 is configured to shorten.

  An end portion on the upstream side of the first screw 40 constituting the second conveying screw 21 is connected to a nut member 47 a fixed to the intermediate shaft 47 of the second screw 41 constituting the first conveying screw 20 via a bearing 52. The second screw 41 of the first conveying screw 20 is supported so as to be rotatable, and is slid in the telescopic direction so as to rotate relative to the drive shaft 42. On the other hand, the end of the second screw 41 constituting the second conveying screw 21 on the downstream side of the conveying is connected to the second screw 41 via a bearing 55 that is externally fitted to a nut member 47 a fixed to the intermediate shaft 47 of the second screw 41. The case 24 is rotatably supported by a support member 53 fixed to the sleeve 27 at the end portion on the upstream side of conveyance of the case 24, and rotates together with the drive shaft 42, so that the second case 24 is relative to the first case 23. When sliding, the second case 24 and the drive shaft 42 are configured to slide in the telescopic direction.

  As shown in FIGS. 6 and 7, a third transport screw 22 is provided on the transport downstream side of the first transport screw 20 and the second transport screw 21, and the second case 24 is formed by the first transport screw 20 and the second transport screw 21. It is configured to convey the grain that has been conveyed to the discharge port 9b provided at the end of the second case 24 on the lower conveyance side.

  The third conveying screw 22 includes a cylindrical third tube shaft 56 and a helical third screw blade 57 that is wound and fixed over the entire length of the outer peripheral portion of the third tube shaft 56. Has been.

  A support shaft 56a extends from the end of the third transport screw 22 on the downstream side of the third cylindrical shaft 56, and the support shaft 56a is rotatably supported by the second case 24 via a bearing 58. ing. On the other hand, a nut member 56b in which a hexagonal hole is machined is fixed to an end portion of the third conveying screw 22 on the upstream side of the third cylindrical shaft 56, and the nut member 56b has a hexagonal cross-sectional drive. The tip of the shaft 42 is fitted inside.

  As described above, by configuring the third conveying screw 22, when the drive shaft 42 rotates via the bevel transmission mechanism 19, the third conveying screw 22 also rotates integrally with the driving shaft 42, and the second case. The grain that has been conveyed to 24 is configured to be conveyed toward a discharge port 9 b provided at the end of the second case 24 on the downstream side of conveyance.

[Structure of telescopic mechanism]
As shown in FIGS. 6, 10, and 11, an expansion / contraction mechanism 33 that expands / contracts the horizontal auger 9 is provided across the first case 23 and the second case 24. The length of the horizontal auger 9 can be adjusted by the case 24 entering the first case 23.

  A bracket 34 is fixed to the lower side of the conveyance downstream end of the first case 23, and an electric motor 35 is attached to the bracket 34 via a speed reducer 36. A pinion gear 37 is fixed to the output shaft 36 a of the speed reducer 36, and the pinion gear 37 is provided below the second case 24 through an opening 23 a provided below the first case 23. The rack 32 is configured to be engaged with the rack groove 32a. Thus, by providing the electric motor 35 on the first case 23 side and providing the rack 32 on the second case 24 side to form the telescopic mechanism 33, wiring to the electric motor 35 is facilitated, and the first case 23 and the second case 24 are provided with an expansion / contraction mechanism 33, so that rainwater is less likely to be directly applied to the electric motor 35, the rack 32, etc. during rainy weather, and the rack 32, the output shaft 36a, etc. are rusted. Therefore, the elastic mechanism 33 having excellent durability can be configured.

  By configuring the telescopic mechanism 33 as described above, when the lateral auger telescopic lever 60 (see FIG. 1) provided in the control unit 4 is operated to the expansion side, the electric motor 35 rotates and the output shaft 36a of the speed reducer 36 The pinion gear 37 fixed to the output shaft 36a rotates by rotating. If it does so, the 2nd case 24 can move to the conveyance downstream side with respect to the 1st case 23, and the horizontal auger 9 can be expanded. On the other hand, when the lateral auger telescopic lever 60 provided in the control unit 4 is operated to the shortened side, the electric motor 35 rotates in the reverse direction and the output shaft 36a of the speed reducer 36 rotates in the reverse direction, and the pinion fixed to the output shaft 36a. The gear 37 rotates in the reverse direction. If it does so, the 2nd case 24 will move to the conveyance upstream with respect to the 1st case 23, and the horizontal auger 9 can be shortened.

  In this way, a configuration is adopted in which the second case 24 is slid relative to the first case 23 by the rack 32 provided on the second case 24 side, the electric motor 35 and the pinion gear 37 provided on the first case 23 side. By doing so, the structure can be simplified and the manufacturing cost can be reduced.

[Expanded state of horizontal auger]
As shown in FIG. 3, when the second case 24 is moved upstream of the first case 23 with respect to the first case 23 by the telescopic mechanism 33 from the state in which the horizontal auger 9 is most extended (the state of FIG. The drive shaft 42 located inside the case 24 moves inside the third cylindrical shaft 56 to the downstream side of conveyance. As a result, the length between the upstream end portion of the first transport screw 20 and the downstream end portion of the second transport screw 21 becomes shorter, and the first transport screw 20 and the second transport screw 21 have the first length. Two screws 41, 41 are pushed into the upstream side of conveyance. Then, the first transport screw 20 rotates relative to the second screw 41 of the first transport screw 20 in the direction opposite to the direction in which the first screw 40 transports the grains to the discharge port 9b. The direction of entering the 20 second screw 41 and the direction in which the first screw 40 of the second conveying screw 21 conveys the grain to the discharge port 9b with respect to the second screw 41 of the second conveying screw 21 is reversed. The second conveying screw 21 enters the second screw 41 while relatively rotating in the direction.

On the other hand, when the second case 24 is moved downstream of the first case 23 by the telescopic mechanism 33 from the state in which the horizontal auger 9 is shortened most (the state shown in FIG. The drive shaft 42 positioned moves inside the third cylindrical shaft 56 to the upstream side of conveyance. As a result, the length between the upstream end portion of the first transport screw 20 and the downstream end portion of the second transport screw 21 becomes longer, and the first transport screw 20 and the second transport screw 21 have the first length. The two screws 41, 41 are pulled downstream of the conveyance. Then, the first screw 40 of the first conveying screw 20 is supported by the first case 24 at the end of the conveying upstream side, so only the second screw 41 of the first conveying screw 20 moves to the conveying downstream side. Then, the first screw 40 of the first transport screw 20 rotates relative to the second screw 41 in the direction of transporting the grain to the discharge port 9b. The first screw 40 of the second transport screw 21 is supported by the second screw 41 of the first transport screw 20 at the end on the upstream side of the transport, so that the second transport of the first screw 40 with respect to the first transport screw 20 is performed. Only the second screw 41 of the screw 21 moves to the downstream side of conveyance, and the first screw 40 of the second conveyance screw 21 is in relation to the second screw 41 of the second conveyance screw 21 and the second screw 41 of the first conveyance screw 20. And rotate relative to the direction of conveying the grain to the discharge port 9b.

  As shown in FIG. 3 (b), when the second case 24 moves 2L upstream of the first case 23 by the telescopic mechanism 33, the first transfer screw 20 and the second transfer screw 21 are shortened by L, respectively. . That is, when the first screw 40 of the first conveying screw 20 enters L with respect to the second screw 41 of the first conveying screw 20, the first conveying screw 20 is shortened by L, and the first screw of the second conveying screw 21. When 40 enters L with respect to the second screw 40 of the second transport screw 21, the second transport screw 21 is shortened by L.

  Thus, in addition to the 1st conveyance screw 20 provided with the 1st screw 40 and the 2nd screw 41, in addition to the 1st screw 40 and the 2nd conveyance screw 21 provided with the 2nd screw 41, it comprises, and it is horizontal. The length for extending and retracting the auger 9 can be secured long, and the lateral auger 9 can be expanded and contracted in a wide range. Further, the drive shaft 42 is configured to enter the inside of the third cylindrical shaft 56 of the third transport screw 22, and all of the first transport screw 20, the second transport screw 21, and the third transport screw 22 are driven by the drive shaft 42. Can be configured to be rotatable. In other words, the expandable lateral auger 9 has a simple structure and functions by effectively utilizing the characteristics of the arrangement of the first conveying screw 20, the second conveying screw 21, and the third conveying screw 22 and the drive structure thereof. It can be made excellent.

[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], the horizontal auger 9 (grain discharge auger) provided with the second transport screw 21 and the third transport screw 22 in addition to the first transport screw 20 is taken as an example. However, the horizontal auger 9 may be constituted by only the first conveying screw 20, or the horizontal auger 9 may be constituted by a combination of the first conveying screw 20 and the third conveying screw 22.

  In the above-mentioned [Best Mode for Carrying Out the Invention], the example in which the first screw blade 46 is configured to move at a substantially intermediate position of the screw pitch in the transport direction of the second screw blade 49 is shown. If the grain can be prevented from being compressed and the frictional force is difficult to work between the first screw blade 46 and the second screw blade 49, the first screw blade 46 is in relation to the second screw blade 49. The moving position may be a different position.

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] and [First Alternative Embodiment of the Invention], the structure of the first screw 40 and the second screw 41 is devised for the slide mechanism and the rotation mechanism, and the transmission is performed. Although an example realized by using the ball 51 or the like has been shown, a different structure may be adopted as long as the same function is achieved.

[Third Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], [First Another Mode of Carrying Out the Invention] and [Second Another Mode of Carrying Out the Invention], the telescopic mechanism 33 includes the rack 32, the pinion gear 37, and the like. Although an example configured using the above is shown, a different structure may be adopted as long as the same function is achieved. For example, the expansion / contraction mechanism 33 may be configured using a feed screw (not shown) or the like. .

Combine right side view Overall plan view of combine Longitudinal section showing the overall structure of the horizontal auger Longitudinal sectional view showing the detailed structure of part A in a state where the horizontal auger is extended Longitudinal sectional view showing the detailed structure of part B in a state where the horizontal auger is extended Longitudinal sectional view showing the detailed structure of part C in a state where the horizontal auger is extended Longitudinal sectional view showing detailed structure of part D in a state where the horizontal auger is extended Longitudinal sectional view showing the detailed structure of part E in a state where the horizontal auger is shortened Longitudinal sectional view showing the detailed structure of the F section when the horizontal auger is shortened Longitudinal sectional view showing the detailed structure of the G section in a state where the horizontal auger is shortened XX cross section showing structure of telescopic mechanism

Explanation of symbols

9 Horizontal auger (grain discharge auger)
9a supply port 9b discharge port 23 first case 24 second case 33 telescopic mechanism 40 first screw 41 second screw 42 drive shaft 45 first tube shaft 46 first screw blade 47 intermediate shaft 48 second tube shaft 49 second screw 49 Feather

Claims (3)

A cylindrical first case; a cylindrical second case configured to be slidable with respect to the first case; and an expansion / contraction mechanism provided across the first case and the second case. The first and second cases include a first screw located on the upstream side of the conveyance and a second screw located on the downstream side of the conveyance, and the winding direction of the first screw blade of the first screw and the The winding direction of the second screw blade of the second screw is set to the same winding direction, and the supply port located at the end of the first case on the upstream side of the transfer from the supply port on the downstream side of the transfer of the second case. It is a combine grain discharge auger that is configured to be able to convey the grain toward the discharge port located and to be stretchable,
When the first and second cases are expanded and contracted by the expansion and contraction mechanism, a slide mechanism is provided that slides the second screw relative to the first screw while overlapping the first screw .
The first and second cases are provided with a drive shaft concentric with the first and second cases, and the drive shaft is provided with the first and second screws on the outer periphery.
The first screw is configured to include a first cylinder shaft that is rotatable relative to the drive shaft provided on an outer peripheral portion of the drive shaft, and the first screw blade.
An end portion on the upstream side of conveyance of the first screw blade is fixed to an end portion on the upstream side of the outer peripheral portion of the first cylindrical shaft, and a predetermined interval is provided from the outer peripheral surface of the first cylindrical shaft. Wrap the screw blades spirally toward the downstream side of conveyance,
The second screw is externally fitted to the drive shaft, and an intermediate shaft that can rotate integrally with the drive shaft and is slidable relative to the drive shaft, and a predetermined interval from an outer peripheral surface of the intermediate shaft. A second cylinder shaft that can rotate integrally with the provided intermediate shaft, and the second screw blade;
The second screw blade is spirally wound around and fixed to the outer periphery of the second cylindrical shaft,
A combine grain discharge auger that constitutes the slide mechanism by fitting a first cylinder shaft of the first screw between an intermediate shaft and a second cylinder shaft of the second screw . When the first and second cases are shortened by the expansion and contraction mechanism and the second screw is slid and moved upstream of the first screw, the first screw is moved to the second screw. grain discharge auger combine of claim 1, wherein the direction of conveyance are provided with a rotating mechanism for relative rotation in the opposite direction to the discharge port.   When the first and second cases are expanded and contracted by the expansion / contraction mechanism and the second screw slides relative to the first screw, the first screw blades of the first screw are adjacent to each other. 3. The combine grain discharging auger according to claim 1 or 2, wherein the slide mechanism is configured to move while relatively rotating around the center of the two screw blades.

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