JP2006112387A - Wind-causing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent degradation in cooling efficiency caused by the adhesion of the dust or the like to a dust proof net. <P>SOLUTION: A wind-causing wing 42 is provided on the outer peripheral part of a hub 41 so that the wind-causing wing can change its position around an axial center P2 set in the direction which the axial center P2 intersects a rotational axial center P1. The wind-causing wing causes wind by rotating integrally with the hub 41 around the rotational axial center P1 of the hub. The wind-causing structure is provided with an operating mechanism 77 which switches the position of the wind-causing wing 42 between a following wind causing position and a reverse wind causing position. The wind-causing structure is constituted so that the wind velocity, which is in a reverse-wind-causing state with the wind-causing wing 42 set in the reverse wind causing position, is higher than the wind velocity in a following-wind-causing state with the wind-causing wing 42 set in the following wind causing position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention can change the attitude of a wind-generating blade that winds by rotating integrally with the hub around the rotation axis around the axis set in a direction intersecting the rotation axis to the outer periphery of the hub. And a wind generating structure provided with an operation mechanism that changes the posture of the wind blade to a normal wind generating posture and a reverse wind generating posture.

  In the wind generating structure as described above, by changing the attitude of the wind turbine blade that rotates integrally with the hub around the rotation axis to the normal wind generating attitude, outside air is taken into the interior from the intake port to cool the heat generating portion. A normal wind condition can be generated, and by changing the position of the wind blade to the reverse wind position, dust adhering to the dust net at the intake port is blown out and removed from the dust net when taking in outside air. It is possible to show the head wind occurrence state.

By the way, in such a wind generating structure, conventionally, the wind speed in the forward wind generating state in which the generating blade is set in the forward wind generating posture is larger than the wind speed in the reverse wind generating state in which the generating blade is set in the reverse wind generating posture. Thus, for example, a high wind-up action surface with high wind-up efficiency in the wind-up blade is used as a front-wind action surface, and a low wind-up action surface with low wind-up efficiency is used as a back wind action surface. (See, for example, Patent Document 1).
JP 2004-211581 A (paragraph number 0013, FIG. 8)

  According to the above configuration, the wind speed in the forward wind occurrence state is increased, so that dust and the like are easily attached to the dust removal net of the intake port when taking in outside air, and the wind speed in the reverse wind occurrence state is reduced, It becomes difficult to remove dust and the like adhering to the dust removal net, and as a result, it becomes difficult to take in outside air from the intake port, resulting in a decrease in cooling efficiency for the heat generating portion. In particular, in order to avoid a decrease in cooling efficiency due to the occurrence of a reverse wind occurrence state, the appearance time of the forward wind occurrence state is usually set to several minutes, and the appearance time of the reverse wind occurrence state is about several seconds. Since the amount of dust adhering to the dust removal net in the normal wind occurrence state increases, the amount of dust removal from the dust removal net in the reverse wind occurrence state decreases. As a result, the cooling efficiency for the heat generating portion is significantly reduced.

  An object of the present invention is to prevent a decrease in cooling efficiency due to adhesion of dust or the like to a dust removal net.

  As means for solving the above-mentioned problems, in the invention according to claim 1 of the present invention, a wind is generated at the outer peripheral portion of the hub by an integral rotation around the rotation axis of the hub. Equipped with an operating mechanism for changing the attitude of the wind-up blade into a normal wind-induced attitude and a counter-wind-generating attitude, equipped with a wing so that the attitude can be changed around an axis set in a direction intersecting the rotational axis, The wind speed in the reverse wind occurrence state in which the wind wing is set in the reverse wind occurrence posture is configured to be higher than the wind speed in the normal wind occurrence state in which the wind wing is set in the forward wind occurrence posture.

  According to this configuration, when the attitude of the wind-up blade is changed to the wind-starting attitude, a normal-wind generating state in which outside air is taken into the interior through the intake port to cool the heat generating part appears, and the attitude of the wind-generating blade is changed to the counter-wind generating state. When the posture is changed, a reverse wind occurrence state appears in which dust or the like adhering to the dust removal net of the intake port is blown out and removed from the dust removal net when outside air is taken in. The wind speed in the normal wind occurrence state is smaller than the wind speed in the reverse wind occurrence state, which makes it difficult for dust and the like to adhere to the dust removal net of the intake port when taking in outside air, and conversely, the wind speed in the reverse wind occurrence state Is larger than the wind speed in the normal wind occurrence state, it becomes easy to remove dust and the like adhering to the dust removal net, and as a result, it becomes easy to take in outside air from the intake port.

  In particular, in order to avoid a decrease in cooling efficiency due to the appearance of the headwind occurrence state, the appearance time of the front wind occurrence state is set to a long time of about several minutes, and the appearance time of the headwind occurrence state is about several seconds. When a normal wind condition occurs, the amount of dust attached to the dust removal net can be reduced while increasing the amount of outside air taken in from the intake port, and then the reverse wind condition appears. In this case, dust attached to the dust removal net can be blown out to the outside in a short time.

  Accordingly, it is possible to rationally take in outside air from the air inlet and remove dust adhering to the dust removal net, and to improve the cooling efficiency for the heat generating portion.

  In the invention according to claim 2 of the present invention, in the invention according to claim 1, the wind-up angle of the wind-up blade in the counter-wind generation posture is set to be the normal wind. The wind speed is set to be larger than the wind angle of the wind blade in the generated posture, and the wind speed in the reverse wind generation state is configured to be higher than the wind speed in the forward wind generation state.

  According to this configuration, the above-described rational intake is achieved by simply making an improvement so that the wind-up angle in the counter-wind occurrence posture of the wind-up blade is larger than the wind-up angle in the forward wind occurrence posture. It can take in outside air from the mouth and remove dust adhering to the dust removal net.

  Therefore, it is possible to improve the cooling efficiency for the heat generating portion without causing a complicated configuration or an increase in cost.

  In the invention according to claim 3 of the present invention, in the invention according to claim 1, the high wind-up action surface having high wind-up efficiency in the wind-up blade is used as the work surface for back wind, and A low low wind action surface is set as a forward wind action surface, and the wind speed in the reverse wind generation state is configured to be higher than the wind speed in the forward wind generation state.

  According to this configuration, a simple improvement can be made by simply setting the high wind-up action surface with high wind-up efficiency on the wind-up blade as the reverse-wind action surface and the low wind-up action surface with low wind-up efficiency as the forward wind action surface. By applying, it is possible to take in the outside air from the above-described rational intake port and to remove dust attached to the dust removal net.

  Therefore, it is possible to improve the cooling efficiency for the heat generating portion without causing a complicated configuration or an increase in cost.

  According to a fourth aspect of the present invention, in the invention according to the first aspect, the hub is provided so as to be displaceable in a direction along the rotation axis, and the hub of the hub by the operating mechanism is provided. The configuration is such that the attitude of the wind-up blade is changed in conjunction with the displacement operation in the direction along the rotation axis, and the hub and the shroud that covers the wind-up blade are provided, and the start-up state in the reverse wind generation state is provided. The overlapping amount in the direction along the rotational axis of the wind blade and the shroud is larger than the overlapping amount in the direction along the rotational axis of the wind blade and the shroud in the forward wind occurrence state. And the wind speed in the reverse wind occurrence state is configured to be larger than the wind speed in the forward wind occurrence state.

  According to this configuration, the state in which the hub is displaced toward the shroud along the rotation axis is the reverse wind generation state in which the attitude of the wind blade is changed to the reverse wind generation position, and the hub is set to the rotation axis. Along the direction of moving away from the shroud is a forward wind occurrence state in which the attitude of the wind blade is changed to the forward wind occurrence position, and in the direction along the rotational axis between the wind blade and the shroud in the reverse wind occurrence state. Since the amount of overlap is larger than the amount of overlap in the direction along the rotational axis of the wind blade and shroud in the normal wind occurrence state, it is possible to effectively suppress the diffusion of the wind in the reverse wind occurrence state. The wind speed in the state becomes larger than the wind speed in the normal wind occurrence state.

  In other words, the configuration is such that the attitude of the wind-generating blade is changed in conjunction with the displacement operation in the direction along the rotation axis of the hub, and the state in which the hub is displaced toward the shroud side is the reverse wind generation state, and the shroud By simply making improvements so that the state of the displacement operation away from the side becomes a normal wind generation state, the above-described rational intake of outside air from the intake port, dust adhering to the dust removal net, etc. Can be removed.

  In particular, the amount of overlap in the direction along the rotational axis of the wind turbine blade and the shroud in the reverse wind generation state is larger than the amount of overlap in the direction along the rotational axis of the wind blade and the shroud in the normal wind generation state. Therefore, even if the low wind-up action surface of the wind-up blade, which tends to cause a reduction in wind-up efficiency due to wind turbulence, is set as the counter-wind action surface, the shroud causes A decrease in wind efficiency can be effectively suppressed, and a large wind speed can be secured.

  Therefore, it is possible to improve the cooling efficiency for the heat generating portion without causing a complicated configuration or an increase in cost.

  FIG. 1 shows the entire right side of a self-decomposing combine as an example of a work vehicle, and FIG. 2 shows the entire plane. The combine is formed into a frame shape by a square pipe material or the like. The frame 1, a pair of left and right crawler type traveling devices 2 arranged at the lower part of the machine body frame 1, and harvesting the planted culm as it travels so as to convey it toward the left rear while changing its posture to the left-right orientation. The rear part of the cutting and conveying unit 3 in the body frame 1 so as to receive the harvested cereals from the cutting and conveying unit 3 connected to the front part of the body frame 1 so as to be able to swing up and down and to perform the threshing and sorting process. The threshing device 4 mounted at the location, the grain tank 5 arranged at the right side location of the threshing device 4 in the machine frame 1 so as to store the grain from the threshing device 4, and the cutting in the machine frame 1 It is constituted by such as the driver's section 6, which is formed on the right side portion of the feeding portion 3.

  The grain tank 5 is provided with a screw-type discharge mechanism 7 for discharging the grain stored therein to the outside of the machine, and is provided with a discharge mechanism 7 erected at the rear portion of the grain tank 5 in the body frame 1. Using the lifting screw 8 as a fulcrum, the working position for storing the grain from the threshing device 4 adjacent to the threshing device 4 and the maintenance position for opening the right side of the threshing device 4 away from the threshing device 4 It is configured to be swingable and displaceable in the left-right direction.

  The boarding operation unit 6 includes a boarding step 9 laid on the right front of the body frame 1, a front panel 10 erected immediately before the boarding step 9 in the body frame 1, and a turning operation equipped on the front panel 10. In addition, the control lever 11 for raising and lowering the cutting and conveying section, the side panel 12 standing on the left side of the boarding step 9 in the body frame 1, the main transmission lever 13 and the auxiliary transmission lever 14 provided on the side panel 12 , And a driver's seat 15 arranged behind the boarding step 9.

  As shown in FIGS. 1 to 4, the driver's seat 15 is provided on an upper portion of an engine bonnet 17 that covers a prime mover 16 provided at a location in front of the grain tank 5 in the machine body frame 1.

  A gap is secured between the grain tank 5 and the engine bonnet 17 to allow the rocking displacement of the grain tank 5 with the lifting screw 8 as a fulcrum.

  The prime mover 16 includes a water-cooled engine 19 that is mounted on the body frame 1 in an anti-vibration posture with the output shaft 18 facing left and right, a radiator 20 that is erected on the right outer side of the engine 19, and a belt. The cooling fan 22 is provided between the engine 19 and the radiator 20 so as to be rotationally driven in a fixed direction by the power from the output shaft 18 transmitted through the power transmission mechanism 21.

  The radiator 20 is provided with a shroud 20 </ b> A that surrounds the cooling fan 22 and efficiently takes in outside air by the cooling fan 22.

  The engine bonnet 17 is formed in a hollow structure in which the right side wall 23 includes an air guide path 24, and an intake port 27 in which a dust removal net 26 is stretched on an outer surface 25 of the right side wall 23 is an inner surface 28 of the right side wall 23. In addition, a communication port 29 for the radiator 20 is formed, and clean air from which dust or the like is filtered and removed by the dust removal net 26 by the suction action of the cooling fan 22 is supplied to the radiator 20 or the engine 19 for cooling. It is configured.

  As shown in FIGS. 3 to 6, the belt-type transmission mechanism 21 includes an output pulley 30 mounted on the output shaft 18, and a first input mounted on an input shaft 32 of a generator 31 disposed on the left side of the engine 19. A pulley 33, a second input pulley 36 mounted on a pump shaft 35 of a water pump 34 disposed in the front upper part of the engine 19, a transmission belt 37 laid around each of the pulleys 30, 33, 36, etc. It is constituted by.

  The second input pulley 36 is made of a sheet metal having a central portion 38 bulging outwardly in a cylindrical shape so that the central portion 38 has an internal space that allows the water pump 34 to enter. The bulging end portion is connected to the first rotating body 39 fixed to the projecting end of the pump shaft 35 by four bolts 40, whereby the disc-shaped second input is connected to the pump shaft 35 of the water pump 34. Compared with the case where the pulley 36 is mounted, the pump shaft 35 uses the power from the output shaft 18 as the driving force of the water pump 34 while shortening the arrangement length in the direction along the axis P1 of the pump shaft 35. 35.

  Then, the water pump 34 is driven by the power from the engine 19 via the belt-type transmission mechanism 21 in this manner, whereby the cooling water is circulated between the cooling water jacket (not shown) provided in the engine 19 and the radiator 20. The engine cooling efficiency can be improved.

  As shown in FIGS. 3 to 10, the cooling fan 22 includes a hub 41 that is rotationally driven together with the pump shaft 35 with the axis P1 of the pump shaft 35 as a rotation axis, and a rotation axis P1 around the hub 41. 7 wind turbine blades 42 that generate wind by integral rotation, and the like, and are configured to generate wind by being rotationally driven in a certain direction by power from the engine 19 via the belt-type transmission mechanism 21. .

  The hub 41 is formed in a bowl shape having a recessed space in the center thereof, and seven boss-shaped first support portions 43 are aligned and formed on the outer periphery of the hub 41 at regular intervals in the circumferential direction. In each of the first support portions 43, the support shaft portion 44 of the wind-up blade 42 can be relatively rotated about the corresponding axis P2 set in a direction orthogonal to the rotation axis P1 via the metal bearing 45. It is supported by.

  The recessed space of the hub 41 is provided with a second rotating body 46 that is connected to the first rotating body 39 by the four bolts 40 so as to rotate integrally with the second input pulley 36. At the center of 46, a support shaft 47 having a circular cross-section provided with its axis aligned with the axis P1 of the pump shaft 35 is press-fitted and fitted so as to rotate integrally with the second rotating body 46. The center portion of the hub 41 can be slid relative to the support shaft 47 in the direction along the rotational axis P1 with high fitting accuracy with the tilting due to play being suppressed. Are supported. That is, the support shaft 47 is a sliding guide shaft that allows sliding displacement in the direction along the rotation axis P <b> 1 of the hub 41 with respect to the second rotating body 46.

  Then, an O-ring 49 serving as a seal member for preventing foreign matter from entering between the center portion of the hub 41 and the support shaft 47 on the outer side of the collar 48 between the center portion of the hub 41 and the support shaft 47. Is inserted.

  At the center of the hub 41, four holes 50 for bolt operation are formed with a predetermined interval in the circumferential direction, and the lid body closes the holes 50 and prevents the O-ring 49 from coming off. 51, and a pair of the hub body 41 and the spring receiver 52 that is bolted to the support shaft 47 together with the lid body 51 to bias the hub 41 toward the second input pulley 36. The compression spring 53 is interposed.

  In the outer peripheral portion of the second rotating body 46, a corresponding one of the four through holes 54 formed in the central portion of the hub 41 at a predetermined interval in the circumferential direction is along the rotational axis P1. The four interlocking shafts 55 that are inserted so as to be relatively slidable in the direction and rotate the hub 41 around the rotational axis P1 in association with the rotation of the second rotating body 46 around the rotational axis P1 are It is equipped with press-fit fitting with a predetermined interval in the circumferential direction.

  Collars 56 are internally fitted in the respective through holes 54, and between the collars 56 and the corresponding interlocking shafts 55, the hub 41 and the second rotating body 46 are spaced apart from the respective rotational axes P <b> 1 in the outer peripheral direction. In order to avoid poor insertion of the interlocking shaft 55 with respect to the through-holes 54 due to manufacturing errors between the through-holes 54 drilled or deployed in the through-holes 54 and the corresponding interlocking shafts 55, a relatively large gap is formed. In addition, it prevents foreign matter from entering between each through-hole 54 and the corresponding interlocking shaft 55 and prevents the generation of noise due to contact between the hub 41 and the interlocking shaft 55 during driving or stopping of driving. An O-ring 57 is inserted. These O-rings 57 are prevented from coming off by ring-shaped pressing metal fittings 58 that are screwed to the hub 41.

  A swing arm 59 that swings around the axis P2 as the shaft P2 rotates is fixed to the support shaft portion 44 of each of the wind blades 42. A linkage pin 60 protruding toward the second rotating body 46 is provided at the free end portion that is disengaged from the connection portion with the support shaft portion 44, and the linkage mechanism 61 is provided by the swing arm 59, the linkage pin 60, and the like. Is configured.

  Seven groove portions 62 into which the corresponding linkage pins 60 are engaged are formed on the outer edge portion of the second rotating body 46 at a predetermined interval in the circumferential direction. In order to avoid interference with the nut 63 that fixes the swing arm 59 to the support shaft portion 44 of the blade 42, a recess is formed.

  In other words, the second rotating body 46 is disposed in the recessed space of the hub 41, and the rotation axis P1 is effectively utilized by utilizing the gap between the outer peripheral portion of the hub 41 and the outer peripheral portion of the second rotating body 46 in the recessed space. A linkage mechanism 61 is provided for changing the attitude of the wind-up blades 42 around their axis P2 by the displacement of the hub 41 with respect to the second rotating body 46 in the direction along The cooling fan 22 can be made compact while the posture can be changed around the axis P2.

  In addition, between the 2nd input pulley 36 and the 2nd rotary body 45, the positioning in the direction in alignment with the rotating shaft center P1 of the 2nd input pulley 36, or the removal | extraction to the 2nd input pulley 36 side of each drive shaft 54 is carried out. A spacer 64 for stopping and the like is interposed.

  A support member 66 that supports the shift fork 65 so as to be swingable in the direction along the rotation axis P <b> 1 is bolted to the front portion of the engine 19, and the lower end of the shift fork 65 has a second input pulley 36. A cylindrical moving member 67 that surrounds the central portion 38 is supported and connected through a pair of bolts 68 in a state in which the posture of the shift fork 65 using the bolts 68 as a fulcrum can be changed. In addition, a second support portion 69 formed on the outer peripheral portion of the hub 41 is supported via a radial bearing 70.

  That is, the hub 41 is supported by the support shaft 47 via the collar 48 and the outer periphery thereof is supported by the moving member 67 via the radial bearing 70, and the hub 41 can swing the shift fork 65. Accordingly, it is configured to be integrally displaced together with the moving member 67 in the direction along the rotational axis P1.

  In addition, the second input pulley 36 is supported by supporting the second support portion 69 formed on the outer peripheral portion of the hub 41 via the radial bearing 70 on the moving member 67 that surrounds the center portion 38 of the second input pulley 36. The outer peripheral portion of the hub 41, the moving member 67, and the radial bearing 70 can be arranged in a compact state in which the outer peripheral portion of the hub 41, the radial bearing 70 are overlapped in the direction along the rotation axis P1 of the hub 41.

  Each of the second support portions 69 is formed between the first support portions 43 on the outer peripheral portion of the hub 41 so as to be located on the radially inner side of the hub 41 with respect to the first support portion 43. The moving members 67 and the radial bearings 70 supported by the second support portions 69 link the wind-generating blades 42 supported by the first support portions 43 to the second rotating body 46 in the radial direction of the hub 41. In the direction along the rotation axis P <b> 1 of the hub 41, the hub 41 is arranged so as to overlap with the linkage mechanism 61.

  As a result, compared with the case where the second support portion 69 is formed at the same position as the first support portion 43 in the radial direction of the hub 41, the length and radial direction of the hub 41 in the direction along the rotation axis P1 are increased. Without increasing the length, the cross-sectional area of each first support portion 43 of the hub 41 can be increased, and the support strength of the wind-up blade 42 at each first support portion 43 and the overall strength of the hub 41 can be increased. Can be increased.

  Further, compared to the case where the moving member 67 and the radial bearing 70 are not superposed in the radial direction of the hub 41 with respect to the linkage mechanism 61, the length in the radial direction of the hub 41 can be reduced. Accordingly, the effective wind length of each of the wind blades 42 can be increased without increasing the size of the cooling fan 22 in the radial direction, and high wind performance by the wind blades 42 can be ensured. .

  Furthermore, compared to the case where the moving member 67 and the radial bearing 70 are not superposed in the direction along the rotation axis P1 of the hub 41 with respect to the hub 41, the direction in the direction along the rotation axis P1 of the hub 41 is larger. The length can be reduced, so that it is easy to deploy between the engine 19 and the radiator 20 where it is difficult to secure a large space.

  In addition, the first support portions 43 formed when the second support portions 69 are formed over the entire outer peripheral portion of the hub 41 in a state where the second support portions 69 are positioned radially inward of the hub 41 with respect to the first support portion 43. When supporting the wind-up blade 42, or when the wind-up blade 42 and the second rotating body 46 are linked by the linkage mechanism 61, a decrease in assembling property due to the second support portion 69 becoming an obstacle is avoided. it can.

  On the outer peripheral portion of the hub 41, a ring-shaped presser fitting 71 for supporting and fixing each second support portion 69 on the outer peripheral portion to the radial bearing 70 is screwed.

  As shown in FIGS. 1 to 6, the upper end portion of the shift fork 65 is attached to a sector gear 74 supported on the rear wall 73 of the engine bonnet 17 via a push-pull wire 72 so as to be swingable on the front and rear axis P3. The sector gear 74 is meshed with an output gear 76 of an electric motor 75 that can be switched between forward and reverse rotation with a reduction gear disposed on the rear wall 73 of the engine bonnet 17.

  When the sector gear 74 is driven to swing rightward around the front and rear axis P3 by the power from the electric motor 75, the push-pull wire 72 is pulled and the shift fork 65 rotates. By swinging in the direction along the axis P1, the hub 41 together with the moving member 67 resists the urging force of the compression spring 53, and the right side of the machine body along the rotation axis P1 against the second rotating body 46. As a result of this displacement, the postures of the wind wings 42 are simultaneously changed from the forward wind occurrence posture to the reverse wind occurrence posture.

  When the sector gear 74 is driven to swing leftward about the front / rear axis P3 by the power from the electric motor 75, the pulling operation by the push-pull wire 72 is released by the swing, and the hub 41 is moved. Is displaced to the left of the machine body along the rotation axis P1 with respect to the second rotating body 46 together with the moving member 67 by the bias of the compression spring 53, and this displacement causes the posture of each of the wind blades 42 to be reversed. Changed from the starting posture to the normal wind generating posture all at once.

  That is, the hub 41 is rotated with respect to the second rotating body 46 by the operation of the electric motor 75 by the compression spring 53, the shift fork 65, the moving member 67, the push-pull wire 72, the sector gear 74, the electric motor 75, and the like. An operating mechanism 77 that displaces in the direction along the axis P1 is configured, and the amount of displacement of the hub 41 relative to the second rotating body 46 by the operating mechanism 77 is the amount of rotation operation of each of the wind blades 42 relative to the hub 41 by the linkage mechanism 61. As a result, the postures of the wind wings 42 can be changed all at once.

  When each of the wind blades 42 is switched to the normal wind generating posture, a normal wind generating state in which outside air is sucked into the engine bonnet 17 from each intake port 27 of the engine bonnet 17 in accordance with the rotation around the rotation axis P1. When the wind generator blades 42 are switched to the reverse wind generating posture, the hot air in the engine bonnet 17 is transferred from the intake ports 27 on the right side wall 23 of the engine bonnet 17 along with the rotation around the rotation axis P1. A state of occurrence of a reverse wind that appears outside the machine appears.

  In each of the blast blades 42, the high blast action surface 42A having a high blast efficiency is a blast action surface in the forward wind generation posture, and the low blast action surface 42B having a low blast efficiency is the reverse wind occurrence. The posture is set so as to be a wind-up action surface in the posture.

  The operation of the electric motor 75 is controlled by a control device 78 having a microcomputer or the like. The control device 78 controls the operation of the electric motor 75 based on a pre-stored control program and Based on the detected value from the angle sensor 79 comprising a rotary potentiometer that detects the swing angle around the front and rear axis P3 as the operation amount of each wind-generating blade 42 by the electric motor 75, each operation by the operation of the electric motor 75 is performed. A posture change of the wind-up blade 42 to the normal wind generation posture or the reverse wind generation posture is detected.

  As an example of the control operation of the control device 78, the control device 78 starts measuring time when the engine 19 is started, and each time starting until the first set time (for example, 3 minutes) set in advance has elapsed. By maintaining the attitude of the wind blades 42 in the normal wind generating attitude and displaying the normal wind generating state, the outside air taken in from each intake port 27 of the engine bonnet 17 is supplied to the radiator 20 or the engine 19 to cool them. .

  When the first set time elapses, the posture of each of the wind blades 42 is switched from the normal wind generating posture to the reverse wind generating posture, and the counter wind is maintained until a preset second set time (for example, 5 seconds) elapses. By maintaining the occurrence posture and presenting a reverse wind occurrence state, the dust attached to the dust removal net 26 of the right side wall 23 is blown out by the hot air discharged from each intake port 27 of the engine bonnet 17 to the outside of the machine. Remove from.

  When the second set time elapses, the posture of each wind blade 42 is switched from the reverse wind occurrence posture to the forward wind occurrence posture, and the posture of each wind blade 42 is changed to the normal wind occurrence posture until the first set time elapses. The normal wind occurrence state is displayed while maintaining the state, and thereafter, the reverse wind occurrence state and the normal wind occurrence state are switched and displayed based on the time measurement.

  In other words, the dust removal net 26 of the right side wall 23 in the engine bonnet 17 is periodically cleaned automatically while the prime mover 16 is cooled by the intake action of the cooling fan 22 and the exhausting action of the cooling fan 22 is periodically performed. Therefore, it is possible to avoid a decrease in cooling capacity due to clogging due to dust and the like adhering thereto, and thus the driving portion 16 can be efficiently and effectively cooled.

  The electric motor 75 is mounted on the base plate 80 together with the sector gear 74, the angle sensor 79, and the like. The base plate 80 is connected to the rear surface 81 of the rear wall 73 of the engine bonnet 17, and the sector gear 74 and the electric motor 75 are connected to the grain tank 5. It is located between the engine bonnet 17 and is bolted so that the angle sensor 79 is positioned inside the engine bonnet 17.

  That is, the electric motor 75 is positioned between the grain tank 5 and the engine bonnet 17 in a state where the grain tank 5 side is opened, whereby the electric motor 75 is moved from the driving unit 16 to the electric motor 75. The hot air can be prevented from acting directly, and the electric motor 75 can be exposed to the outside air flowing between the grain tank 5 and the engine bonnet 17 from the low temperature grain tank 5 side, The electric motor 75 can be effectively cooled, and it is possible to avoid the possibility that the electric motor 75 is heated to a temperature higher than the allowable temperature by the hot air from the driving unit 16 and does not function normally. Even under bad summer conditions, it is possible to reliably prevent the engine 19 from being overheated due to the cooling capacity being reduced due to clogging due to the malfunction of the electric motor 75.

  Further, since the angle sensor 79 is positioned inside the engine bonnet 17, the pressure radiated at the time of the pressure car wash or the like without incurring a cost increase and a complicated structure due to the provision of the dedicated waterproof structure. It is possible to effectively prevent the occurrence of problems that water with water enters into the angle sensor 79.

  By the way, the push-pull wire 72 always faces the hub 41 toward the second input pulley 36 together with the moving member 67 via the shift fork 65 in the forward wind generating state in which the posture of each of the wind blades 42 is changed to the forward wind generating position. Thus, while adopting a compression spring 53 having a small urging force as a compression spring 53 that urges the hub 41 toward the second input pulley 36, it is possible to apply a preload that presses the hub 41. The wind wings 42 can be maintained in the normal wind generating posture against the load. Further, by adopting a small urging force as the compression spring 53, a small electric motor 75 that changes the posture of each wind blade 42 from the normal wind generating posture to the reverse wind generating posture against the urging force. Further, since the space between the lid 51 and the spring support 52 that interposes the compression spring 53 can be reduced and the cooling fan 22 can be reduced in size, the engine 19 and the radiator 20 It becomes easy to perform deployment in the limited narrow space between.

  As shown in FIG. 7, the posture of each of the wind blades 42 is such that the wind speed in the reverse wind generation state is larger than the wind speed in the forward wind generation state. However, it is set to be larger than the wind angle θb of the wind blade 42 in the normal wind generating posture.

  As a result, in the forward wind occurrence state in which the posture of each of the wind blades 42 is changed to the forward wind occurrence posture, dust or the like is generated while the outside air is taken into the engine bonnet 17 from each intake port 27 of the engine bonnet 17 by the action. Inconvenience of adhering to the dust removal net 26 of the intake port 27 can be made difficult to occur, and conversely, in the reverse wind generation state in which the attitude of each wind blade 42 is changed to the reverse wind generation attitude, the action causes adhesion to the dust removal net 26. It is possible to effectively remove dust and the like in a short time.

[Another embodiment]
Hereinafter, other embodiments of the present invention will be listed.
[1] As shown in FIG. 11, each wind generation in the reverse wind generation state in which the hub 41 is displaced toward the shroud 7A along the rotation axis P1 to change the position of each wind blade 42 to the reverse wind generation position. The overlap amount L1 of the blades 42 and the shroud 7A in the direction along the rotational axis P1 is operated to displace the hub 41 in the direction away from the shroud 7A along the rotational axis P1, and the posture of each of the wind blades 42 is made to be a normal wind. The wind speed in the reverse wind generation state is increased by making the wind speed larger than the overlap amount L2 in the direction along the rotation axis P1 between each of the wind blades 42 and the shroud 7A in the normal wind occurrence state changed to the occurrence posture. You may comprise so that it may become larger than the wind speed in an occurrence state.

[2] As shown in FIG. 12, each of the wind blades 42 has a high wind generating surface 42 </ b> A having a high wind generating efficiency as a wind generating surface (back wind working surface) in a reverse wind generating posture. The posture is set so that the low wind generating surface 42B with low wind generating efficiency becomes the wind generating surface in the forward wind generating posture (the surface for forward wind), and the wind speed in the reverse wind generating state is the wind speed in the normal wind generating state. You may comprise so that it may become larger.

[3] Although illustration is omitted, a split pulley is adopted as the second input pulley 36, and the movable pulley is integrally displaced with the hub 41 when the hub 41 is displaced along the rotation axis P1. In the reverse wind generation state in which the hub 41 is displaced toward the radiator 7 along the rotation axis P1 to change the posture of each wind blade 42 to the reverse wind generation posture, the engine 19 is associated therewith. When the movable pulley is separated from the fixed pulley on the side, the effective diameter of the second input pulley 36 is reduced and the rotational speed of the cooling fan 22 is increased. Conversely, the hub 41 is moved from the radiator 7 along the rotational axis P1. In the forward wind occurrence state in which the attitude of each of the wind blades 42 is changed to the forward wind occurrence position by performing the displacement operation in the direction away from the second input pow, the movable pulley approaches the fixed pulley on the engine 19 side accordingly. By 36 effective diameter is increased in the rotational speed of the cooling fan 22 is set so as to decrease wind velocity in the headwind occurrence state may be configured to be larger than the wind speed at the downwind occurrence state.

[4] The wind generating structure according to the present invention may be applied to a cooling device that cools by supplying outside air to a CPU, a hard disk, or the like disposed in a casing, or a ventilation device that replaces air in an operation cabin.

[5] The work vehicle may be an ordinary combine, a carrot harvester or a radish harvester.

[6] As the prime mover 16, an air-cooled engine may be mounted instead of the water-cooled engine 19.

[7] The posture change of the wind-generating blade 42 may be configured to be performed by an electric cylinder, a hydraulic cylinder, a hydraulic motor, or the like, or may be configured to be performed manually.

[8] With the operation of the electric motor 75, the attitude of each of the wind blades 42 is maintained in a non-winding attitude in which no wind is generated regardless of the rotation driving around the rotation axis P1 (rotation driving of the cooling fan 22). You may comprise so that the appearance of a wind-up state may be attained.

  According to this configuration, for example, in a work vehicle or the like, if the non-winding state appears when the engine 19 is started, the cooling fan 22 is rotationally driven by the power from the engine 19, It is possible to avoid an increase in the starting load of the engine 19 due to the wind load, and the engine 19 can be started smoothly by the starter motor.

Overall side view of self-removing combine Overall plan view of self-decomposing combine Partial vertical section rear view of the prime mover Longitudinal side view of the prime mover Longitudinal rear view of the main part showing the configuration of the cooling fan Partial longitudinal rear view of the main part showing the normal wind occurrence state and the reverse wind occurrence state Plan view of the main part showing the normal wind occurrence posture and the reverse wind occurrence posture of the wind blade Longitudinal side view of the main part showing the configuration of the cooling fan Longitudinal side view of the main part showing the configuration of the operating mechanism Enlarged vertical side view showing the structure of the center of the cooling fan A longitudinal side view of the main part in another embodiment configured to increase the wind speed in the reverse wind generation state by changing the amount of overlap between the shroud and the wind blades The top view of the principal part in another embodiment comprised so that the wind speed in a reverse wind generation state might be enlarged by the setting change of the wind generating action surface to be used

Explanation of symbols

7A Shroud 41 Hub 42 Winding blade 42A High wind-up action surface 42B Low wind-up action surface 77 Operating mechanism θa Wind-up angle (back wind generation posture)
θb Winding angle (forward wind generation posture)
L1 Overlap amount (head wind generation posture)
L2 overlap amount (forward wind occurrence posture)
P1 axis of rotation P2 axis (winding blade)

Claims (4)

On the outer periphery of the hub, equipped with a wind-generating blade that winds by integral rotation with the hub around its rotational axis, so that the posture can be changed around the axis set in the direction intersecting the rotational axis,
An operation mechanism for changing the posture of the wind wing to a normal wind occurrence posture and a reverse wind occurrence posture,
A wind-up structure configured such that a wind speed in a reverse wind generation state in which the wind blade is set in a reverse wind generation posture is larger than a wind speed in a normal wind generation state in which the wind blade is set in a forward wind generation posture.   The posture of the wind-up blade is set so that the wind-up angle of the wind-up blade in the reverse-wind generation posture is larger than the wind-up angle of the wind-up blade in the forward wind generation posture, The wind generating structure according to claim 1, wherein the wind speed in the generated state is configured to be greater than the wind speed in the forward wind generated state.   The high wind-up action surface with high wind-up efficiency in the wind-up blade is set as the back-wind action surface, and the low wind-up action surface with low wind-up efficiency is set as the forward wind action surface. The wind generating structure according to claim 1, wherein the wind generating structure is configured to be larger than a wind speed in the normal wind generating state. The hub is equipped to be displaceable in a direction along the rotation axis,
In conjunction with a displacement operation in the direction along the rotational axis of the hub by the operation mechanism, the posture of the wind wing is changed,
Providing a shroud covering the hub and the wind-up blade;
The amount of overlap in the direction along the rotational axis between the wind wing and the shroud in the reverse wind occurrence state is in the direction along the rotational axis between the wind wing and the shroud in the forward wind occurrence state. 2. The wind generating structure according to claim 1, wherein the wind speed structure is set so as to be larger than an overlap amount so that a wind speed in the reverse wind generation state is higher than a wind speed in the forward wind generation state.

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