JP5134584B2 - Combine pulling device - Google Patents

Description

  The present invention relates to an apparatus for raising a combine that raises planted cereals.

  Conventionally, as shown in Patent Document 1, a first guide wheel body 35 disposed on the upper inside of the raising case 31 and a second guide wheel body 33 disposed on the lower inner side of the raising case 31; A chain 37 wound around the chain 37, a plurality of raising claws 38 attached to the chain 37, a tension ring body 36 that contacts the chain 37 from the inside of the winding path of the chain 37, and the tension ring body 36 are supported. There is a combine pulling device (hereinafter, simply referred to as “pushing device”) provided with a biasing means for biasing the support member in a direction approaching the chain 37. However, the reference numerals used in this paragraph are those shown in FIG.

  The pulling device described in Patent Document 1 will be described in more detail. For example, as shown in FIG. 8, the pulling device is disposed inside the winding path R of the first guide plate 126 a disposed inside the winding path R of the chain 24 and the first guide plate 126 a. A second guide plate 126c. The support member 127 is supported by the first guide plate 126a and the second guide plate 126c so as to be movable along the direction approaching the chain 24. The tension ring body 28 is supported at the tip of the support member 127. Further, the support member 127 is provided with an engaging portion 127 a that allows the support member 127 to move by the biasing means 29 in the direction approaching the chain 24 and prevents the support member 127 from moving in the direction away from the chain 24. Yes.

  According to this technique, when the chain 24 is about to sag, the supporting member 127 is moved to the chain 24 side by the urging means 29, and the tension ring body 28 winds the chain 24 and stretches it outside the path R. Further, the locking portion 127a prevents the support member 127 from moving in the direction Y away from the chain 24. As a result, the chain 24 is always tensioned and the slack of the chain 24 can be appropriately removed.

JP 2009-65863 A

  In this technique, for example, as shown in FIG. 8, the guide member 126 includes a first guide plate 126a and a second guide plate 126c, and a first hole 126b formed in the first guide plate 126a, and a second The support member 127 was inserted through the second hole 126d formed in the guide plate 126c. When the support member 127 tries to move in the direction Y, the engaging portion 127a is engaged with the first hole 126b, and the movement of the support member 127 in the direction Y is prevented. At this time, the tension To from the chain 24 acts on the tension ring body 28. Based on this tension To, the support member 127 is pressed against the first hole 126b and the second hole 126d. That is, the force FP acts on the engaging portion 127a (point P) with the point A that is a contact point between the support member 127 and the second hole portion 126d as a fulcrum. Further, at point A, a force FA acts on the support member 127.

  The action relationship between these forces will be described in detail. However, assuming that the chain 24 and the tension ring 28 are in contact at one point O, a direction in which the support member 127 is separated from the chain 24 is a direction Y, and a direction orthogonal to the direction Y is a direction X. A tension To of the chain 24 acts on the tension ring body 28 in both sides of the chain 24 in the tension direction. The resultant force of the tension To is the combined tension T. Assuming that the resultant tension T is decomposed in the direction X and the direction Y into the component force Tx and the component force Ty, the component force Tx and the component force Ty act on the tension ring based on the tension To.

Based on the component force Tx, the force FA and the force FP act on the support member 127 as described above. Assuming that the length from point A to point O in direction Y is L3 and the length from point A to point P is L4,
Tx × L3 = FP × L4
The balance formula holds.

  As apparent from FIG. 8, since L3 is larger than L4, the force FP is larger than the component force Tx. That is, the component force Tx is increased and applied to the engaging portion 127a. Therefore, an excessive load is applied to the engaging portion 127a, and there is a possibility that the support member 127 and the first guide plate 126a are worn or missing. If such a situation occurs, it is possible that the slack in the chain cannot be removed, and the raising device cannot operate normally.

  In view of the above circumstances, an object of the present invention is to provide an apparatus for raising a combine that can reduce the load on a member that removes the slack of the chain.

  The first characteristic configuration of the combine pulling device according to the present invention includes a pulling case that is inclined rearward and upward at the front part of the combine body, and a first that is disposed on the upper side of the pulling case. A guide wheel, a second guide wheel disposed on the lower side of the raising case, the first guide wheel and the second guide wheel wound around the first guide wheel, An endless chain that circulates between the second guide ring body, a plurality of raising claws attached to the chain, and a first guide plate disposed inside a winding path of the chain; Supported by the first guide plate and the second guide plate movably along the direction approaching the chain, the second guide plate disposed inside the winding path than the first guide plate. Supported by the support member and the tip of the support member, A tension ring body that contacts the chain from the inside of the winding path; and a biasing means that biases the support member in a direction approaching the chain, and the biasing in a direction approaching the chain The support member or the second guide plate is provided with an engaging portion that allows movement of the support member by means and prevents movement of the support member in a direction away from the chain, and in the movement direction of the support member The length from the first guide plate to the second guide plate is set to be longer than the length from the first guide plate to the portion where the tension ring body and the chain are in contact, Of the chain tension acting on the body, the force in the direction perpendicular to the moving direction is configured to act on the engaging portion with the first guide plate as a fulcrum. .

According to this configuration, for example, as shown in FIG. 3, the force Tx in the direction X perpendicular to the moving direction Y of the support member 27 out of the tension To of the chain 24 acting on the tension ring 28 is a first guide plate 26a. Acting on the engaging portion 27a with fulcrum as a fulcrum When the support member 27 is regarded as a “lever” and the “lever principle” is applied,
“A force Tx in the direction X perpendicular to the moving direction Y of the support member 27 out of the tension To of the chain 24 acting on the tension ring body 28” × “<contact point A between the support member 27 and the first guide plate 26a> To <portion O where tension ring body 28 and chain 24 are in contact >> = “force FP acting on engaging portion 27a” × “<contact point between support member 27 and first guide plate 26a” A> to <engagement portion 27a> length L2 "
The balance formula holds.

  With this configuration, the “length from the <contact point between the support member and the first guide plate> to the <engagement portion>” is the same as the “<contact point between the support member and the first guide plate> to the <tension”. Since the length of the part until the part where the ring body and the chain come in contact is longer than "the length of the chain that acts on the engagement part", the "force acting on the engagement part" is orthogonal to the moving direction of the support member. Smaller than the “force in the direction to do”. That is, the tension ring body can reduce the tension received from the chain and act on the engaging portion. As a result, the load applied to the support member and the second guide plate is reduced, and wear and defects can be suppressed.

  According to a second characteristic configuration of the combine pulling device according to the present invention, the support member is a plate material, and a first hole portion having a long hole shape along a cross-sectional shape of the support member is opened in the first guide plate. In addition, a long hole-shaped second hole along the cross-sectional shape of the support member is opened in the second guide plate, and the support member has a gap around the first hole and the second hole. The support member is supported by the first guide plate and the second guide plate, and the support member is bent by the bending moment around the moving direction based on the tension. The first hole and the second hole are arranged in the plane so that the support member and the tension ring are parallel to the plane around which the chain is wound when tilted inside the section. It is in the point which is inclined with respect to and opened.

  For example, as shown in FIG. 5, when the tension ring 28 is supported by the tip of the support member 27, the center surface G of the support member 27 in the plate thickness direction and the plane on which the chain is wound (hereinafter referred to as “winding”). Therefore, when the chain 24 is driven to rotate, a bending moment M about the movement direction Y acts on the support member 27 based on the tension from the chain 24. If the support member 27 is a plate material, the installation space can be reduced by a thickness that is less than that of a round material or the like. However, when the bending moment M is applied, the support member 27 is separated into the first hole portion and the second hole portion 26d. Lean against.

  Temporarily, the first guide plate and the second hole portion 26d are parallel to the plane E around which the chain 24 is wound (hereinafter referred to as “winding plane”) E. If the support member 27 is tilted, the support member 27 and the tension ring body 28 are not parallel to the winding plane E when the support member 27 is inclined. Therefore, the load applied to the tension ring body 28 increases. Further, since the tension ring body 28 is inclined with respect to the chain 24, the chain 24 may be detached from the tension ring body 28.

  In this configuration, in a state where no bending moment is generated, the support member and the tension ring body are not parallel to the winding plane, but a bending moment is generated and the support member is in the first state. When inclined with respect to the hole and the second hole, the support member and the tension ring are wound and are parallel to the plane. Therefore, the load applied to the tension ring does not increase, and the chain does not come off the tension ring.

  According to a third feature of the combine pulling device according to the present invention, the support member is a plate material, and a first hole portion having a long hole shape along a cross-sectional shape of the support member is opened in the first guide plate. In addition, a long hole-shaped second hole along the cross-sectional shape of the support member is opened in the second guide plate, and the support member has a gap around the first hole and the second hole. The support member is inserted into and supported by the first guide plate and the second guide plate, the engagement portion is provided in the support member, and the engagement portion of the second hole is engaged. The length in the short side direction of the long hole shape in the portion to be formed is set to be larger than the length in the short side direction in the portion of the second hole portion where the engagement portion is not engaged.

  For example, as shown in FIG. 9, when the second hole 26d has the same width in the long side direction, the engagement area 27a of the second hole 26d is narrow because the engagement area 27a can be engaged. And the second hole 26d may become shallower and the contact area may be reduced. In this case, the load is locally applied to the engaging portion 27a and the second hole portion 26d, and there is a possibility that wear or loss may occur. In addition, the valley portion 27c of the engaging portion 27a may bite into the second hole portion 26d, and there is a possibility that wear or loss may occur.

  As shown in FIG. 7, for example, as shown in FIG. 7, the length t <b> 1 in the short side direction of the long hole shape in the portion where the engaging portion 27 a is engaged in the second hole portion 26 d is set as the second hole portion. 26d, if it is set to be larger than the length t2 in the short side direction at the portion where the engaging portion 27a is not engaged, the range in which the engaging portion 27a can be engaged in the second hole portion 26d becomes wider. The engagement between the joint portion 27a and the second hole portion 26d is deepened, and the contact area is increased. Further, the valley portion 27c of the engaging portion 27a does not contact the second hole portion 26d.

  Thus, according to this structure, while being able to prevent a load being locally applied to an engaging part and a 2nd hole, it can also prevent that an engaging part bites into a 2nd hole.

These are side views of the combine which concerns on this invention. These are the longitudinal sectional front views of the raising apparatus which concerns on this invention. FIG. 3 is a longitudinal front view of the vicinity of a guide member. FIG. 5 is a longitudinal side view of the vicinity of a guide member. FIG. 4 is a cross-sectional view in the vicinity of the guide member. These are exploded perspective views, such as a guide member. FIG. 4 is a cross-sectional view in which the vicinity of the guide member is enlarged. These are the longitudinal cross-sectional front views of the guide member vicinity in a prior art. These are the cross-sectional top views which expanded the guide member vicinity in a prior art.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a combine pulling device (hereinafter simply referred to as “lifting device”) to which the present invention is applied will be described below with reference to the drawings.

(overall structure)
The combine according to the present invention harvests rice, wheat, etc., and as shown in FIG. 1, a fuselage frame 1 that is a skeleton of the fuselage, and a pair of left and right crawler type traveling devices 2 that support the fuselage, The cutting part 3 connected to the front part of the body frame 1 and the threshing device 4 and the grain tank 5 provided on the rear side of the body frame 1 are provided. Further, the combine includes a driving unit 6 on the right side of the body on the front side of the body frame 1, and a driving unit (not shown) below a driver seat 6 a included in the driving unit 6.

  The cutting unit 3 performs the cutting process by raising the planted culm to be cut. The harvested cereal meal is delivered to the threshing device 4. The threshing device 4 includes a threshing feed chain 4a on the left side of the machine body. The stock side of the harvested cereal rice cake received from the harvesting unit 3 is sandwiched by the threshing feed chain 4a and conveyed to the rear side of the machine body. The threshing device 4 supplies the tip side of the harvested cereal culm to a handling room (not shown). The handling chamber is provided with a handling cylinder (not shown) that rotates around the longitudinal direction of the traveling machine body. Threshing is performed by handling the tip side of the harvested cereal by turning the handle. The grain tank 5 stores the threshed grains threshed by the threshing device 4.

(Reaping part)
As shown in FIG. 1, the mowing unit 3 includes a main frame 10, a weeding frame 11, a pair of left and right pulling devices 14 </ b> R and 14 </ b> L, and a clipper type cutting device 15. The main frame 10 is pivotally supported by the body frame 1 via the shaft core 10p. A hydraulic cylinder 13 is provided between the vicinity of the center of the main frame 10 and the front side of the body frame 1, and the main frame 10 can swing up and down by the expansion and contraction of the hydraulic cylinder 13. That is, the mowing unit 3 swings up and down with respect to the body frame 1 under the control of the hydraulic cylinder 13, and a descending working state in which the divider 12 is lowered near the ground, and a rising non-working state in which the divider 12 is raised from the ground. The posture can be changed.

  The weeding frame 11 is connected to the front-end | tip part of the main frame 10 with the attitude | position of the body front-back direction. The number of weeding frames 11 is determined according to the number of cutting lines, and although not shown, in this embodiment, three weeding frames 11 are provided in parallel to each other. A divider 12 is provided at each front end of the weeding frame 11. The left and right dividers 12 are respectively provided at positions corresponding to the outer positions of the left and right traveling devices 2. A middle divider 12 is provided approximately in the middle of the left and right dividers. Usually, the left-side divider 12 and the middle divider 12 are used to weed and cut two rows of planted cereals, and the right-side divider 12 and the middle divider 12 are used to weed a single set of planted cereals. Reaping is performed. That is, three-row cutting is possible. However, it is also possible to weed and cut the two rows of planted cereals with the right divider 12 and the middle divider 12. That is, it is possible to perform four-row cutting.

  When the cutting unit 3 is in the descending operation state and the traveling machine body is caused to travel, the planted cereals are weeded and introduced between the adjacent dividers 12. The planted culm is raised by the left and right pulling devices 14R and 14L, and is cut by the cutting device 15 provided between the weeding frames 11 on both left and right ends.

(Raising device)
Since the left and right pulling devices 14R and 14L are substantially symmetrical, only the pulling device 14R on the right side of the body will be described, and the description of the pulling device 14L on the left side of the body will be omitted. The pulling device 14 </ b> R is provided slightly behind the divider 12. As shown in FIG. 2, the raising device 14 </ b> R includes a raising case 20, a first guide wheel body 21, a second guide wheel body 22, a chain 24, a plurality of raising claws 25, and a guide plate 26. , A support member 27, a tension ring body 28, and a spring 29 as "biasing means".

  As shown in FIG. 1, the raising case 20 is provided at the front of the machine body so as to be inclined rearward.

  As shown in FIG. 2, the first guide wheel body 21 is disposed on the upper side of the pulling case 20 and is rotationally driven by the driving force transmitted from the rear body side. Although not shown, the second guide ring body 22 is arranged on the lower side inside the raising case 20 so as to be positioned between the adjacent dividers 12. The first guide wheel body 21 and the second guide wheel body 22 are sprockets. The chain 24 is an endless type and is wound around the first guide wheel body 21 and the second guide wheel body 22, and the first guide wheel body 21 and the second guide wheel body are driven by the driving of the first guide wheel body 21. The lap drive is performed between Hereinafter, the path on which the chain 24 is driven to rotate is referred to as a “winding path R” according to the present invention, and a plane including the winding path R is referred to as a “winding plane E”. The winding plane E corresponds to a “plane” according to the present invention.

  In the present embodiment, a third guide wheel body 23 is provided on the outer side of the second guide wheel body 22 in the left-right direction. The third guide wheel body 23 is also a sprocket, and the chain 24 is also wound around the third guide wheel body 23. When the third guide ring body 23 is provided, compared to the case where the third guide ring body 23 is not provided, the range in which the planted culm can be raised in the left-right direction of the machine body is wide, and the planted cereal pulsate is caused. There is little left. Moreover, since it is such a structure, the above-mentioned three-row cutting and four-row cutting are possible.

  The pulling claw 25 is attached to the chain 24 so as to be swingable on the plane E. The raising claw 25 is L-shaped and includes a base portion 25a on the side of the chain 24 and a distal end portion 25b on the side opposite to the base portion 25a.

  As shown in FIG. 4, the guide plate 26 is formed by bending a long plate-shaped steel material. The first side portion 26a which is one side surface of the guide plate 26 corresponds to the “first guide plate” of the present invention. The second side portion 26c which is the other side surface of the guide plate 26 corresponds to the “second guide plate” of the present invention. As shown in FIGS. 2 and 3, the guide plate 26 is disposed inside the winding path R so that the first side portion 26 a is positioned inside the winding path R than the second side portion 26 c. The guide plate 26 is pulled up and fixed to the case 20 with bolts or the like so that the first side portion 26a and the second side portion 26c are wound and orthogonal to the plane E.

  As shown in FIG. 3, the support member 27 is supported by the first side portion 26a and the second side portion 26c. As shown in FIG. 6, a first hole 26b having a long hole shape along the cross-sectional shape of the support member 27 is opened in the first side portion 26a. A second hole portion 26d having a long hole shape along the cross-sectional shape of the support member 27 is opened in the second side portion 26c. The support member 27 is inserted through the first hole portion 26b and the second hole portion 26d. That is, the support member 27 is supported by the guide plate 26 so as to be movable in a direction approaching the chain 24 and a direction away from the chain 24. A small hole is formed at the inner end of the winding path R of the support member 27, and the pin 34 is inserted. Therefore, the support member 27 does not come out from the second hole portion 26d toward the first side portion 26a.

  As shown in FIG. 3, the tension ring body 28 is rotatably supported at the distal end portion of the support member 27 so as to contact the chain 24 from the inside of the winding path R. Therefore, the rotation surface F of the tension ring body 28 and the center surface G of the support member 27 in the plate thickness direction are parallel to each other. The tension ring body 28 is a sprocket, and the tension ring body 28 and the chain 24 are in rolling contact. For example, as compared with the case where the tension ring body 28 and the chain 24 are in sliding contact, such as when the tension ring body 28 is a roller, the friction applied to the tension ring body 28 is reduced. Further, as shown in FIG. 4, the tension ring body 28 is supported by the support member 27 via the bearing 33, and smoothly drives according to the circumferential drive of the chain 24 without hindering the circumferential drive of the chain 24.

  As shown in FIGS. 4 and 6, a coil-shaped spring 29 is disposed between the first side portion 26 a and the second side portion 26 c, and the support member 27 includes the first hole portion 26 b, the inside of the spring 29, the second The holes 26d are passed through in this order. In the vicinity of the middle between the first side portion 26a and the second side portion 26c, the width of the support member 27 is changed to form a spring locking portion 27b. Of the support member 27, the width of the portion on the second side portion 26 c side is smaller than the inner diameter of the spring 29. Of the support member 27, the width of the portion on the first side portion 26 a side is larger than the inner diameter of the spring 29. Thus, the spring 29 is sandwiched between the spring locking portion 27b and the second side portion 26c. As a result, the spring 29 biases the support member 27 in the direction approaching the chain 24.

  In an initial state, the guide plate 26 is positioned so that the spring 29 is compressed and the support member 27 and the tension ring body 28 are wound and urged from the inside to the outside of the path R, and the support member 27 and the spring 29 are thus positioned. Is assembled.

  With the above configuration, the tension ring body 28 winds the chain 24 and presses it from the inside to the outside of the path R to tension the chain 24. As a result, the chain 24 is properly driven without sag. However, although the urging force of the spring 29 acts on the chain 24, if the support member 27 is wound and remains movable from the outside to the inside of the path R, the chain 24 is caused by vibration during traveling. When fluttering occurs, the support member 27 may be retracted to the inside of the winding path R, and the chain 24 and the tension ring body 28 may be disengaged. Accordingly, the support member 27 is provided with an engaging portion 27 a that allows the support member 27 to move by the spring 29 in the direction approaching the chain 24 and prevents the support member 27 from moving in the direction away from the chain 24. . That is, the locking portion 27a and the guide plate 26 constitute a so-called “ratchet structure”.

(Ratchet structure)
FIG. 3 schematically shows the relationship between forces acting on the chain 24, the tension ring body 28, the support member 27, and the guide plate 26. As shown in FIG. A moving direction of the support member 27 is a direction Y, and a direction orthogonal to the direction Y is a direction X. The direction Y corresponds to the “movement direction” according to the present invention. The direction X corresponds to the “direction orthogonal to the moving direction” according to the present invention. A tension To of the chain 24 acts on the tension ring body 28 in both sides of the chain 24 in the tension direction. The resultant force of the tension To is the combined tension T. A component force Tx and a component force Ty are obtained by decomposing the combined tension T in the direction X and the direction Y. That is, a component force Tx and a component force Ty act on the tension ring body 28 based on the tension To. However, it is assumed that the chain 24 and the tension ring 28 are in contact at one point O. The point O corresponds to the “portion where the tension ring body and the chain contact” according to the present invention. Further, the component force Tx corresponds to the “force in the direction orthogonal to the moving direction” according to the present invention.

If the contact point between the support member 27 and the first hole 26b is point A when the component force Tx is applied to the tension ring 28, the support member 27 rotates clockwise around the point A in the front view of FIG. Try to rotate to. As a result, the support member 27 is pressed against the first hole 26b. Therefore, the engaging portion 27a is pressed against the one end surface of the second hole portion 26d with the point A as a fulcrum. Assuming that the contact point between the engagement portion 27a and the second hole portion 26d is a point P, the clockwise rotation of the support member 27 is prevented by the contact between the engagement portion 27a and the second hole portion 26d at the point P. The Thus, of the tension To of the chain 24 acting on the tension ring 28, the component force Tx in the direction X acts on the engaging portion 27a with the first side portion 26a as a fulcrum. Assuming that the force acting on the support member 27 at the point A is the force FA and the force acting on the support member 27 at the point P is the force FP, the component force Tx, the force FA and the force FP are:
Tx + FP = FA
The balance formula is met and balanced.

  The engaging portion 27a includes a plurality of teeth on the side surface of the support member 27 on the chain 24 side, and each tooth is inclined from the first side portion 26a toward the second side portion 26c. Even if the tension To acts on the tension ring 28 and the support member 27 tries to move in the direction Y based on the component force Ty, the inclination of each tooth and the pressing operation to the second hole 26d by the component force Tx At the point P, the engaging portion 27a bites into the second side portion 26c, and movement in the positive direction of the direction Y based on the component force Ty is prevented.

  On the other hand, each tooth can get over the second hole 26d in the negative direction Y, and the support member 27 can move in the negative direction Y. However, in order for each tooth to get over the second hole 26d, a margin for movement in the direction X is required. Therefore, in the direction X, the dimension of the second hole portion 26d in the left-right direction on the paper surface is determined so that a gap greater than the tooth height exists between the second hole portion 26d and the support member 27. In order to allow the support member 27 to move with respect to the second side portion 26c, a gap is provided between the second hole portion 26d and the support member 27 over the entire inner periphery of the second hole portion 26d. . Similarly, a gap is also provided between the first hole portion 26 b and the support member 27.

  When the chain 24 is slack, the support member 27 is moved in the negative direction of the direction Y by the number of teeth of the engaging portion 27a corresponding to the slack by the biasing force of the spring 29. As a result, the tension ring body 28 winds the chain 24 and presses it outside the path R, and the chain 24 is tensioned. As described above, since the support member 27 does not move in the positive direction of the direction Y, there is no possibility that the engagement between the chain 24 and the tension ring body 28 is released due to the shaking of the machine body.

  In the direction Y, the length from the first side portion 26a to the second side portion 26c is set to be longer than the length from the first side portion 26a to the portion where the tension ring body 28 and the chain 24 are in contact with each other. That is, as shown in FIG. 3, in the direction Y, the length L2 from the point A to the point P is longer than the length L1 from the point A to the point O, and the guide plate 26, the support member 27, and the tension ring. The dimensions and arrangement position with the body 28 are determined. The length L1 corresponds to “the length from the first guide plate to the portion where the tension ring body and the chain contact” according to the present invention. The length L2 corresponds to the “length from the first guide plate to the second guide plate” according to the present invention.

With the above configuration, according to the principle of lever
Tx × L1 = FP × L2
Holds. As described above, since L1 <L2, Tx> FP is established, and the force FP can be made smaller than the component force Tx to be applied to the engaging portion 27a. That is, since the load on the engagement portion 27a and the portion of the second side portion 26c with which the engagement portion 27a comes into contact is reduced, it is possible to prevent wear and loss of both members.

(First hole and second hole)
As shown in FIG. 5, the first hole portion 26 b and the second hole portion 26 d are inclined with respect to the winding plane E and opened to the first side portion 26 a and the second side portion 26 c. As described above, the center surface G of the support member 27 and the rotation surface F of the tension ring body 28 are parallel to each other and separated from each other. Therefore, when the chain 24 is driven to rotate, a bending moment around the direction Y acts on the support member 27. As described above, since the support member 27 is inserted through the first hole portion 26b and the second hole portion 26d with a gap therebetween, the support member 27 is tilted counterclockwise as viewed from the front in FIG. . The dimensions and inclination of the first hole part 26b and the second hole part 26d are determined so that the support member 27 and the winding plane E are parallel when the support member 27 is inclined as described above. It is. That is, when the chain 24 is driven to rotate, the rotation surface F of the tension ring body 28 and the winding plane E coincide with each other.

  If the rotation surface F of the tension ring body 28 is inclined with respect to the winding plane E, the chain 24 may deviate from the winding path R and come off the tension ring body 28. Further, since the number of teeth of the tension ring 28 that contacts the chain 24 at the same time is reduced, the tension of the chain 24 acting on the individual teeth of the tension ring 28 is increased, and there is a possibility that the wear of the teeth is accelerated. However, in this configuration, the rotation surface F of the tension ring body 28 and the winding plane E coincide with each other, so that the chain 24 can be smoothly driven without being detached from the tension ring body 28, and tooth wear is also reduced. . Further, no excessive load is applied to the bearing 33.

  Usually, the guide plate 26 is made of steel, and the second hole 26d is formed by punching the guide plate 26 with a punch and a die. When punching a hole in a steel member, if the shape of the hole is square, a punching load may be applied to the corner and a crack may occur, so the corner of the hole is chamfered into an R shape. is there. As shown in FIG. 9, if the second hole portion 26d has the same width in the long side direction, the engagement between the engagement portion 27a and the second hole portion 26d is shallow, and the contact area becomes small. And the load will be applied locally. Further, the valley portion 27c of the engaging portion 27a may bite into the second hole portion 29c. In these cases, there is a possibility that the engaging portion 27a and the second hole portion 26d may be worn or missing.

  In the present embodiment, as shown in FIG. 7, the length t1 in the short side direction of the long hole shape in the portion of the second hole portion 26d where the engaging portion 27a engages is set in the second hole portion 26d. The length t2 in the short side direction at the portion where the engaging portion 27a is not engaged is set. If comprised in this way, the engagement of the engaging part 27a and the 2nd hole part 26d will become deep, and a contact area will become large. Further, the valley portion 27c does not bite into the second hole portion 26c. As a result, wear and loss of the engaging portion 27a and the second hole portion 26d are suppressed.

  In the present embodiment, from the viewpoint of versatility and assemblability of parts, as shown in FIG. 6, the end of the second hole 26d that is not engaged with the locking portion is also on the locking portion side. The shape is the same as that of the end portion of the head, and the entire shape is H-shaped. Furthermore, the shape of the first hole portion 26b is also H-shaped like the second hole portion 26d. However, the present invention is not limited to this, and at least the portion of the second hole 26d that engages with the engaging portion 27a may be in the shape described above.

(Operation of pulling device)
The movement of the pulling device 14R will be described with reference to FIG. The pulling device 14 </ b> R operates by driving the first guide wheel body 21. When the first guide wheel body 21 is driven, the chain 24 is driven to rotate counterclockwise in FIG. 2 along the winding path R, and the raising claw 25 is also driven to rotate around the path R along the chain 24.

  When the raising claw 25 is located between the tension ring body 28 and the third guide ring body 23, it is in a state of lying down along the chain 24. When the raising claw 25 reaches the standing guide 30 provided in front of the third guide wheel body 23, the base 25a of the raising claw 25 comes into contact with the standing guide 30, and the raising claw 25 is in contact with the chain 24. Stand up. When the raising claw 25 is raised, the leading end 25b of the raising claw 25 is raised and protrudes from the case 20.

  Then, the front-end | tip part 25b latches to the stock origin side of the planted cereals weeded by the divider 12 between the 3rd guide ring body 23 and the 2nd guide ring body 22, Pull inward to the left and right sides of the aircraft. A standing guide rail 31 is provided between the third guide wheel body 23 and the second guide wheel body 22, and the base portion 25 a abuts against the standing guide rail 31 even when a reaction force is received from the planted cereal culm. Thus, the raising claw 25 maintains the standing state.

  Further, the chain 24 rises from the second guide wheel body 22 to the first guide wheel body 21 and lifts the planted cereals upward. A standing guide rail 31 is also provided between the second guide wheel body 22 and the first guide wheel body 21, and the raising claw 25 maintains the standing state. During this time, the cutting device 15 cuts the planted side of the planted cereal culm, and the stocker side of the harvested cereal culm is delivered to the threshing feed chain 4a.

  An overturning guide 33 is provided between the first guide wheel body 21 and the tension wheel body 28, and the raising claw 25 comes into contact after the harvested cereal is delivered to the threshing feed chain 4 a. When the chain 24 is moved in a state where the tip 25b of the raising claw 25 follows the shape of the fall guide 33, the raising claw 25 falls on the chain 24.

  The pulling device 14R repeats the above operation. In this operation, since the tension ring body 28, the support member 27, the guide plate 26, etc. are configured as described above, there is no risk of the chain 24 sagging or the chain 24 coming off, and the raising device 14R is smooth and appropriate. To work.

(Another embodiment)
In the above-mentioned embodiment, although the engaging part was provided in the support member 27, it is not restricted to this. The engaging portion may be provided in the guide plate 26 as the second guide plate 26. In this case, although not shown in the drawing, an engaging portion such as the engaging portion 27a according to the above-described embodiment is provided in the second hole portion 26d, and a protrusion that can be engaged with the engaging portion is provided in the support member 27. And good.

  The present invention can be widely used not only for a combine equipped with a pair of left and right pull-up devices, but also for a combine equipped with two or more pairs of pull-up devices.

14R Pull-up device 14L Pull-up device 20 Pull-up case 21 First guide ring body 22 Second guide ring body 24 Chain 25 Pull-up claw 26a First side (first guide plate)
26b First hole 26c Second side (second guide plate)
26d Second hole portion 27 Support member 27a Engagement portion 28 Tension ring 29 Spring (biasing means)
X direction (direction perpendicular to the moving direction)
Y direction (moving direction)
Point O (part where the tension ring contacts the chain)
L1 length (the length from the first guide plate to the part where the tension ring and the chain contact)
L2 length (length from the first guide plate to the second guide plate)
t1 length (the length in the short side direction of the long hole shape at the portion where the engaging portion engages)
t2 length (length in the short side direction at the portion where the engaging portion is not engaged)
R Winding path E Winding plane (plane)
To tension Tx component force (force in the direction perpendicular to the moving direction)
M bending moment

Claims (3)

A pull-up case that is provided at the front of the fuselage inclining backwards,
A first guide ring disposed on the upper side of the pulling case;
A second guide ring disposed on the lower side of the raising case;
An endless chain that is wound around the first guide wheel body and the second guide wheel body and is driven to rotate between the first guide wheel body and the second guide wheel body;
A plurality of raised claws attached to the chain;
A first guide plate disposed inside the winding path of the chain;
A second guide plate disposed inside the winding path from the first guide plate;
A support member supported by the first guide plate and the second guide plate so as to be movable along a direction approaching the chain;
A tension ring supported by the tip of the support member and contacting the chain from the inside of the winding path;
Urging means for urging the support member in a direction approaching the chain,
An engaging portion that allows movement of the support member by the biasing means in a direction approaching the chain and prevents movement of the support member in a direction away from the chain is provided as the support member or the second guide. Prepare for the board,
In the moving direction of the support member, the length from the first guide plate to the second guide plate is set longer than the length from the first guide plate to the portion where the tension ring body and the chain are in contact with each other. And
Of the chain tension acting on the tension ring body, a force in a direction perpendicular to the moving direction acts on the engaging portion with the first guide plate as a fulcrum. apparatus. The support member is a plate material;
A long hole-shaped first hole along the cross-sectional shape of the support member is opened in the first guide plate, and a long hole-shaped second hole along the cross-sectional shape of the support member is opened as the second guide. Open to the plate,
The support member is inserted through the first hole and the second hole with a gap around the support member, and the support member is supported by the first guide plate and the second guide plate.
When the support member is tilted inside the first hole and the second hole due to a bending moment around the moving direction based on the tension, the support member and the tension ring are wound around the chain. The combine pulling device according to claim 1, wherein the first hole portion and the second hole portion are inclined and opened with respect to the plane so as to be parallel to the flat surface. The support member is a plate material;
A long hole-shaped first hole along the cross-sectional shape of the support member is opened in the first guide plate, and a long hole-shaped second hole along the cross-sectional shape of the support member is opened as the second guide. Open to the plate,
The support member is inserted through the first hole and the second hole with a gap around the support member, and the support member is supported by the first guide plate and the second guide plate.
While providing the engaging portion on the support member,
The length in the short side direction of the long hole shape in the portion of the second hole portion where the engagement portion engages, and the short side direction in the portion of the second hole portion where the engagement portion does not engage. 3. The combine pulling device according to claim 1, wherein the combine pulling device is set to be larger than the length of the combine.

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