JP2006002693A - Blower device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a size and hardly cause switching defect even if dirt is large in a blower device enabling a switching between the suction and the exhaust of air by a rotary fan 30. <P>SOLUTION: The blowing vane 34 of the rotary fan 30 is supported on a rotating ring body 32 through a pivot shaft 36 so that its direction can be changed in an air sucking direction and an air exhaust direction. An operation member 41 is interlocked with the operation part 39 of the blowing vane 34 through an operation body 42, a relay body 43, and an interlocking link 44. When the operation member 41 is swingably operated, a fork part 41a of the operation member 41 movably operates the operation body 42 in the axial direction of a rotary drive shaft 21 through the interlocking link 44 and the relay body 43, and the operation body 42 swings the operation part 39 to change the direction of the blowing vane 34. A cover part 71 integrally and rotatably installed on the rotating ring body 32 and a cylindrical guide part 73 integrally and rotatably installed on the operation body 42 cover an internal space 38 in which the operation part 39 of the rotating ring body 32 is positioned, and a clearance between the cover part 71 and the cylindrical guide part 73 is sealed by a seal material 75. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air blower including a rotary fan that is rotatably supported by a rotary drive shaft.

  For example, in an air blower adapted to suck and supply engine cooling air by a rotating fan, especially in a work vehicle such as a combine, if the rotating fan is also provided with an exhaust function, the exhaust air from the engine bonnet is exhausted by the exhaust of the rotating fan. When the engine cooling air is sucked in, the waste dust adhering to the dust removal tool at the air intake port is blown off, and the air intake port can be cleaned so that the cooling air can easily flow in.

Conventionally, as shown in Patent Document 1, a fan driving pulley 13a that is connected to a rotary fan 13 so as to be integrally rotatable, and an idle pulley 19 are supported on a support shaft 18 so as to be relatively rotatable. The transmission belt 14 is wound around the pulley 19 and the engine output pulley 9a, and the small-diameter side pulley 32b of the normal rotation pulley 32 supported by the switching body 31 on which the support shaft 18 is swingably supported; There is one in which a fan belt 34 is wound around a small-diameter pulley 33b of a reversing pulley 33 supported by a switching body 31 so as to be freely rotatable and the fan driving pulley 13a.
Thus, when the switching body 31 is swung around the support shaft 18 and is moved to the cooling position (FIG. 4), the transmission belt 14 is wound around the large-diameter pulley 32 a of the forward rotation pulley 32. Thus, the driving force of the engine output pulley 9a is transmitted as the normal driving force to the fan driving pulley 13a via the transmission belt 14, the normal rotating pulley 32, and the fan belt 34, and the rotary fan 13 is rotated and driven to the intake side. Then, the engine cooling air is sucked from the intake port having the dust removal net 10.
When the switching body 31 is swung around the support shaft 18 and moved to the dust removal position (FIG. 3), the transmission belt 14 is wound around the large-diameter pulley 33a of the reverse rotation pulley 33, and the engine output The driving force of the pulley 9a is transmitted as the reverse driving force to the fan driving pulley 13a via the transmission belt 14, the reverse pulley 33, and the fan belt 34, and the rotary fan 13 is rotationally driven to the exhaust side and blows air to the dust removal net 10. To do.

JP 2001-65347 A ([0022]-[0024] stages, FIG. 2-4)

  In the case of the conventional blower described above, the transmission structure is particularly large, and the entire blower is also large.

  An object of the present invention is to provide a blower that can be made compact while being able to intake and exhaust, and is less prone to switching between intake and exhaust even if there is a lot of dust.

In the first aspect of the invention, in the blower device including the rotation fan that is rotatably supported by the rotation drive shaft,
The blower blades of the rotary fan are supported by a rotating ring mounted on the rotary drive shaft of the rotary fan so as to be integrally rotatable and can be changed in the direction of intake and exhaust, and the fan blades are supported. An operating body that is provided with an operating section for changing the direction of the rotating wheel body, engages with the operating section, and is externally fitted to the rotating drive shaft so as to be relatively movable in the axial direction of the rotating drive shaft; And an operating member linked to the operating body, and the operating member is operated to move the operating body in the axial direction of the rotation drive shaft so that the blower blades are in the intake direction and the exhaust direction. And a ventilation switching operation mechanism configured to perform a direction change operation, and a cover portion covering an internal space where the operation portion of the rotating wheel body is located is provided in the rotating wheel body so as to be integrally rotatable, and the rotation Concentric with drive shaft The cylindrical guide portion which penetrates freely relatively moves the cover portion with fitted, let includes a rotatable together with the operating body, are the seal member provided between the cylindrical guide portion and the cover portion.

  That is, when the operating member is operated to swing, the operating member moves the operating body in the axial direction of the rotary drive shaft, and the operating body operates the operating portion of the rotating blade to move the rotating blade to the intake direction and the exhaust. Change the direction. When the rotary blades are in the intake direction, the rotary fan driven by the rotary drive shaft blows air to the intake side for the rotary blades in the intake direction, and when the rotary blades are in the exhaust direction, the rotary fan driven by the rotary drive shaft is Air is blown to the exhaust side for the rotary blades for exhaust. As a result, the transmission structure for the rotating fan can be made simple so that the rotating fan can be driven only in one rotation direction, but the air blow switching operation mechanism is located near the rotating ring of the rotating fan. On the other hand, it is possible to switch to a state in which the rotary fan is in an intake operation and blown to the intake side, or to a state in which the rotary fan is in an exhaust operation and blown to the exhaust side.

  The operation part for changing the direction of the blowing blades and the part where the operation body part engaged with the operation part is located are sealed by the cover part, the cylindrical guide part, and the sealing material. Furthermore, when the operating body is moved to change the direction of the blower blades, the cylindrical guide portion moves together with the operating body. At this time, the operating body and the rotating ring of the rotary fan rotate integrally. No relative rotation occurs between the cylindrical guide part and the cover part, only the relative movement in the axial direction of the rotary drive shaft occurs between the cylindrical guide part and the cover part. The material is less likely to deteriorate, and a seal failure between the cylindrical guide portion and the cover portion is less likely to occur.

  Therefore, according to the first aspect of the present invention, the operation member is manually operated or automatically operated to switch between the state of blowing air to the intake side and the state of blowing air to the exhaust side. It can be used for cooling the engine that can supply cleaning air to the dust remover, and it can be used advantageously, but it only needs to drive the rotating fan in one rotation direction and switch air flow. The operation mechanism can be made compact, and can be obtained compactly from the surface of the transmission structure and from the surface of the air flow switching operation mechanism.

  Furthermore, the operation part for changing the direction of the air blowing blades and the part of the operation body that engages with this operation part are sealed with high precision so that dust does not easily enter. Reliable so that it can be easily switched between intake and exhaust by preventing the occurrence of clogging due to cracks entering the moving parts for changing the direction of the blades, even when there is a lot of dust. It can be obtained in a high state.

  According to the second aspect of the present invention, in the configuration of the first aspect of the present invention, the rotary fan is an engine cooling fan, and the intake direction of the blower blade is determined by the engine cooling air through the dust remover at the intake port of the engine bonnet. The exhaust direction of the blower blade is the attachment direction for blowing air toward the dust removal tool.

  That is, when the air blowing blade is switched to the intake direction by an artificial operation or automatic operation of the air flow switching operation mechanism, the rotary fan enters the state of sucking and supplying the engine cooling air, and when the air blowing blade is switched to the exhaust direction. The rotary fan is in a state of sending air to the dust remover at the intake port.

  Therefore, according to the second aspect of the present invention, the engine cooling air is supplied by the rotating fan and the engine is cooled normally by manually operating or automatically operating the air blowing switching operation mechanism. However, when the necessity arises or when the setting time is reached, the air can be blown to the dust removing tool by the rotating fan, and the dust attached to the dust removing tool can be blown off when the cooling air is supplied to clean the intake port.

  As shown in FIG. 1, an engine bonnet 3 that is configured to be self-propelled by a crawler-type traveling device 1 and that has a driving unit equipped with a driver's seat 2 and further serves as a support for the driver's seat 2. In addition, a cutting pre-treatment device 6 is connected to the front part of a body frame 5 of a self-propelled machine body equipped with a prime mover equipped with an engine 4 located inside the engine bonnet 3, and the rear side of the machine body frame 5 Are provided with a threshing device 7 and a grain tank 8, and a combine is configured to harvest rice, wheat and the like.

  That is, the pre-cutting processing device 6 uses a cylinder (not shown) interlocked with the frame of the pre-cutting processing device 6 to lower the working state in which the weeding tool 6a and the like are located near the ground, and the weeding tool 6a. For example, the body frame 5 is swung up and down in a lifted non-working state in which the head is raised from the ground. When the pre-cutting processing device 6 is in the descending work state and the self-propelled machine is run, the pre-cutting processing device 6 separates the planted cereals into a cutting target and a non-cutting target by the weeding tool 6a, and the cutting target. The planted grain culm is raised and processed by the device 6b, and is cut by the clipper-shaped reaping device 6c, and the chopped cereal is conveyed backward by the conveying device (not shown) to the threshing device 7. Supply. The threshing device 7 holds the tip side of the harvested cereal mash from the pre-harvest processing device 6 in a rearward direction of the machine body by a threshing feed chain (not shown), and the tip side thereof into a handling room (not shown). Supply and thresh. The grain tank 8 collects and stores the threshing grains from the threshing device 7.

  As shown in FIGS. 2 and 3, an intake port 10 provided with a dust removal tool 9 made of a sheet metal with a vent hole is provided at the lower portion of the lateral wall 3 a of the engine bonnet 3 and opens toward the lateral outer side of the self-propelled aircraft body. An opening 15 communicating with the intake case 11 located behind the driver seat 2 at the upper part of the lateral wall 3a and an opening toward the lateral outer side of the self-propelled aircraft, and the same as the dust removing tool 9 of the lower intake port 10 An air inlet 12 provided with a dust remover 9 having a structure is provided, and opens to the front wall 3b of the engine bonnet 3 toward the front side of the self-propelled aircraft near the foot of the driving unit, and the dust remover 9 at the lower air inlet 10 And a radiator 14 for cooling the engine is provided between the engine 4 inside the engine bonnet 3 and the lower intake 10 of the engine bonnet 3. Fure Provided in a fixed state to arm 5, between the radiator 14 and the engine 4 is provided with a blower A having an engine cooling fan 30.

  As shown in FIG. 5, the blower A includes the engine cooling fan 30 that is supported by a tip end portion of a rotary drive shaft 21 that extends from a support portion 20 that is positioned at the front portion of the engine 4, and the engine cooling fan 30. A ventilation switching operation mechanism 40 having an operation member 41 located near the rear side is provided.

  As shown in FIGS. 4 and 5, the rotary drive shaft 21 includes an input pulley 22 provided on the base end side of the rotary drive shaft 21 so as to be integrally rotatable, and the input pulley 22 and the output of the engine 4. The pulley 23 is linked to the output shaft 4a of the engine 4 through a fan belt 25 wound around the pulley 23 and the input pulley 24a of the alternator 24 mounted on the engine 4.

  As shown in FIGS. 5 and 7, the engine cooling fan 30 includes a rotating ring body 32 that is externally fitted to the distal end portion of the rotation drive shaft 21 with a mounting boss portion 31, and a peripheral portion of the rotating ring body 32. Blower blades 34 provided on a plurality of support portions 33 arranged radially are provided.

  As shown in FIG. 6, the rotary drive shaft 21 is constituted by a round shaft having a circular cross-sectional shape. Between the rotary drive shaft 21 and the mounting boss portion 31 of the rotating ring body 32 of the engine cooling fan 30. The rotary drive shaft 21 and the rotary ring body 32 are engaged with each other so as to be integrally rotatable by the action of the key 35 as the engagement interlocking means provided in the engine, whereby the engine cooling fan 30 is engaged with the rotary drive shaft 21. On the other hand, it is connected so that it can rotate integrally.

  As shown in FIG. 6, each of the blower blades 34 includes a rotating ring body 32 and a support shaft 36 that extends from the base of the blower blade 34 and is assembled with a bush 37 in a support hole of the support portion 33. The rotating ring body 32 is supported so as to rotate integrally.

  For changing the direction of the blower blade 34 by an operation arm connected to the end projecting from the support portion 33 of the support shaft 36 of each blower blade 34 to the internal space 38 of the rotating wheel body 32 so as to be integrally rotatable. An operation unit 39 is configured. That is, in each blower blade 34, the operating portion 39 is provided in the rotating ring body 32 so as to be swingable around the axis of the support shaft 36. By rotating, the blower blade 34 is supported by the rotating wheel body 32 so as to be integrally rotatable in the intake direction shown in FIGS. 10 (b) and 11 (b), and FIGS. 10 (a) and 11. The operation is switched to the state of being supported by the rotating wheel body 32 so as to be integrally rotatable in the exhaust direction shown in (a).

  Thus, the engine cooling fan 30 is supported by the rotary drive shaft 21 driven by the driving force of the output shaft 4a of the engine 4 via the fan belt 25 so as to be integrally rotatable, and each blower blade 34 is a rotating ring body. 32, the rotary drive shaft 21 is driven to rotate around the axis of the rotary drive shaft 21 in only one rotation direction, and each blower blade 34 is switched to the intake direction. By the suction action of each blower blade 34, the air outside the engine bonnet is sucked into the engine bonnet from the intake ports 10, 12, 13 and the intake case 11 of the engine bonnet 3 through the dust remover 9 to generate engine cooling air. The engine cooling air from each of the intake ports 10, 12, 13 and the intake case 11 is sent to the surface of the radiator 14 in the engine bonnet. In and is combined so as to supply to the radiator 14. When each blower blade 34 is switched to the exhaust direction, the exhaust action of each blower blade 34 causes the air in the engine bonnet to be sent from the back side of the radiator 14 to the surface side to generate a cleaning wind. The cleaning air is supplied to the suction port 10 located immediately before the radiator 14 among the suction ports 10, 12, 13 to clean the dust removing tool 9 of the suction port 10.

  As shown in FIGS. 5 and 8, the air blowing switching operation mechanism 40 has a mounting cylinder portion 42 a at a base end side portion from a portion where the mounting boss portion 31 of the engine cooling fan 30 of the rotary drive shaft 21 is connected. The operating body 42 that is externally fitted, the relay body 43 in which the connecting cylindrical portion 43a is externally fitted to the mounting cylindrical portion 42a of the operating body 42, and the both sides of the rotary drive shaft 21 of the relay body 43 The operating member 41 is configured such that a fork portion 41a is connected to a pair of connecting portions 43b located separately via an interlocking link 44.

  The mounting cylinder portion 42a of the operating body 42 is externally fitted so as to be relatively rotatable with respect to the rotational drive shaft 21 via a bush 45 and relatively movable in the axial direction of the rotational drive shaft 21. The body 42 rotates relative to the rotational drive shaft 21 and relatively moves in the axial direction of the rotational drive shaft 21.

  The operation action portions 46 are provided at a plurality of locations arranged in the circumferential direction of the outer peripheral portion of the operation body 41, and the plurality of operation action portions 46 are individually associated with the operation portions 39 of the plurality of blower blades 34 of the engine cooling fan 30. Combined. That is, each operation work part 46 is provided with a pair of operation pieces 46a integrally formed on the outer peripheral edge of the operation body 41 so as to be aligned in the axial direction of the rotary drive shaft 21. The portion 39 is engaged. That is, when the locking pin 39a of the operating portion 39 is slidably inserted between the pair of operating pieces 46a, and the operating body 42 is moved in the axial direction of the rotary drive shaft 21, the operating force is operated. The operating portion 39 is engaged with the pin 46a so as to be swung around the axis of the support shaft 36 by being transmitted to the locking pin 39a by the piece 46a.

  A plurality of guide pins 51 positioned side by side in the rotation direction of the rotating ring body 32 in the internal space 38 of the rotating ring body 32 of the engine cooling fan 30, and the mounting cylinder part 42 a and the operation action part 46 of the operating body 42. Between the rotating wheel body 32 and the operating body 42, the engaging means 50 having an engaging portion 53 having a plurality of through holes and having a bushing 52 arranged in the circumferential direction of the operating body 42. Is provided.

  As shown in FIG. 6, each guide pin 51 is inserted through the assembly hole 32 a of the rotating wheel body 32 in a posture aligned in parallel with the rotation drive shaft 21, and is connected to the head of each guide pin 51 and rotates. The ring body 32 is fixed to the rotating ring body 32 by a fixing plate 55 fixed to the ring body 32 by a connecting bolt 54. Each guide pin 51 is inserted through the engaging portion 53 of the operating body 42. As a result, the engaging means 50 engages the operating body 42 and the rotating wheel body 32 of the engine cooling fan 30 so as to rotate together by engaging the engaging portion 53 and the guide pin 51, The body 42 is guided to move by a guide pin 51 so as to move in a direction along the axis of the rotary drive shaft 21.

  Therefore, although the operating body 42 and the rotary drive shaft 21 are in a state of relative rotation, the operating body 42 is configured so that the operation acting portions 46 of the operating body 42 are not detached from the operating portions 39 of the blower blades 34. While rotating integrally with the engine cooling fan 30 by the engaging action of the engaging means 50 and being moved and guided by the guide pins 51 of the engaging means 50, the rotary drive shaft 21 reciprocates in the axial direction. It has become.

  The connecting cylinder part 43 a of the relay body 43 is externally fitted to the mounting cylinder part 42 a of the operating body 42 via a ball bearing 47. A stopper portion 43c is provided at one end portion of the connecting cylinder portion 43a of the relay body 43, and a stopper ring 48 is provided at an intermediate portion so as to act as a stopper with respect to one end portion of the ball bearing 47. A stopper portion 42b is provided at an intermediate portion of the mounting cylinder portion 42a, and a stopper ring 48 is provided at one end portion so as to stop the other end portion of the ball bearing 47. While rotating relative to the operating body 42 by the action of the ball bearing 47, the stoppers 43 c and 42 b and the stopper rings 48 are used to move integrally with the operating body 42 in the axial direction of the rotary drive shaft 21. It has become.

  As shown in FIGS. 5 and 8, the operation member 41 has a pair of attachment portions 41 b that can rotate freely via a connecting pin 49 a to a support cylinder portion 49 a of a bracket 49 as a fixing portion provided at the front portion of the engine 4. The fork part 41a connected and the operation arm part 41c connected to one of the pair of attachment parts 41b are provided.

  One end portion of the fork portion 41a is connected to the one connection portion 43b of the relay body 43 via the interlocking link 44, and the other end portion of the fork portion 41a is connected to the interlocking link 44. It is connected with respect to the other connecting portion 43b of the relay body 43. Both the interlocking links 44 and 44 are formed as separate members. In any interlocking link 44, one end side of the interlocking link 44 has a connecting pin 44a formed of a bolt with respect to the connecting portion 43b of the relay body 43. The other end of the interlocking link 44 is connected to the tip of the fork portion 41a via a connecting pin 44b made of a bolt so as to be relatively rotatable. Therefore, the operating member 41 transmits the operating force by the fork portion 41a to the relay body 43 via a pair of interlocking links 44 that can swing individually, thereby making it difficult for the relay body 43 and the operating body 42 to be twisted. However, the operating body 42 is moved via the relay body 43.

  Thereby, the air blowing switching mechanism 40 can swing the operation member 41 by swinging the operation arm portion 41c of the operation member 41 around the axis P of the support cylinder portion 49a of the bracket 49. When the operating member 41 is swung in this way, the fork portion 41a of the operating member 41 swings around the axis P and the relay body 43 is rotated via the pair of interlocking links 44, 44. The relay body 43 is moved in the axial direction of the rotary drive shaft 21 while the operation body 42 is moved and guided by the guide pin 51 of the engaging means 50 via the ball bearing 47. Then, the operation body 42 is operated to rotate the operation portion 39 engaged with each operation action portion 46 around the axis of the support shaft 36 for the movement, and to switch all the blower blades 34 to the intake direction. Or switch to the exhaust direction. That is, by switching the blower blade 34 between the intake direction and the exhaust direction by swinging the operating body 41, the direction of the engine cooling fan 30 is changed to the cooling direction for supplying cooling air to the radiator 14, and the engine bonnet 3 The cleaning direction is switched to supply the cleaning air to the dust removing tool 9 of the air inlet 10.

  As shown in FIGS. 2 and 9, the other end side of the inner cable 59 a of the push-pull transmission operation cable 59 connected at one end side to the operation arm portion 41 c of the operation member 41 is connected to the rear surface side of the intake case 11. It connects with the output arm 61 of the provided ventilation control apparatus 60. FIG.

  As shown in FIG. 9, the blower control device 60 includes the output arm 61 so as to be integrally rotatable by a boss portion being connected to the rotation support shaft 62 of the output arm 61 so as to be integrally rotatable. A fan-shaped gear 63, an electric motor 64 in which an output gear 64 a meshes with the fan-shaped gear 63, and a microcomputer-based control means 65 for operating the electric motor 64. The control means 65 measures a set cooling time of about 3 minutes and a set cleaning time of about 5 seconds, and automatically and repeatedly drives the electric motor 64 between the cooling side and the cleaning side based on the measurement result. The blower control device 60 swings the output arm 61 through the sector gear 63 by the driving force of the electric motor 64, and operates the inner cable 59a of the operation cable 59 to the pull side or the push side by the output arm 61. When the operation member 41 of the air flow switching operation mechanism 40 is swung, the air flow switching operation mechanism 60 is automatically switched. In other words, the ventilation switching operation mechanism 60 repeatedly switches between the cooling operation state in which the air blowing direction of the engine cooling fan 30 is operated in the cooling direction and the cleaning operation state in which the engine cooling fan 30 is operated in the cleaning direction. When the set cooling time elapses after switching, the operation is switched to the cleaning operation state, and when the set cleaning time elapses after the operation is switched to the cleaning operation state, the operation is switched to the cooling operation state.

  That is, when the engine 4 is driven, the engine cooling fan 30 is driven to rotate in only one rotation direction by the driving force of the engine 4, and the air blowing control device 60 sets the air blowing switching operation mechanism 40 to the cooling operation state. During the set cooling time (about 3 minutes) during which the switching operation is repeatedly performed to the cleaning operation state and the air blowing switching operation mechanism 40 is operated in the cooling operation state, the engine cooling fan 30 is inhaled by the air blowing switching operation mechanism 40. Due to the intake action of the air blowing blades 34 that are switched in the direction, the outside air is sucked into the engine bonnet 3 from the intake ports 10, 12, 13 of the engine bonnet 3 and the intake case 11 to generate cooling air. Cooling air is supplied to the radiator 14 to cool the engine 4. During the set cleaning time (about 5 seconds) during which the air flow switching operation mechanism 40 is operated in the cleaning operation state, the engine cooling fan 30 is operated by the air blowing blades 34 that are operated to be switched in the exhaust direction by the air flow switching operation mechanism 40. Due to the exhaust action, the air in the engine bonnet is sent from the rear side of the radiator 14 to the surface side to generate cleaning air, and this cleaning air is mainly supplied to the lower air inlet 10 of the engine bonnet 3. Cleaning is performed by blowing off dust from the dust removing tool 9.

  As shown in FIG. 6, a ring-shaped disk member is fastened to the back surface side of the rotating ring body 32 of the engine cooling fan 30 by a connecting screw 70, and the operation portions 39 of the rotating ring body 32 are positioned. A cover portion 71 covering the internal space 38 is provided so as to be rotatable integrally, and a side surface facing the relay body 43 of the operation body 42 is fixed to a tubular body with a mounting screw 72 to connect the relay body. A cylindrical guide portion 73 that is externally fitted concentrically with the attachment cylinder portion 43a and the axis of the rotary drive shaft 21 with respect to the attachment cylinder portion 43a of 43, and is inserted through the through hole 71a at the center of the cover portion 71. Is provided so as to be integrally rotatable, and an annular assembly groove 74 that is externally fitted to the cylindrical guide portion 73 is disposed in an annular assembly groove 74 that is located at the center of the cover portion 71 of the rotating ring body 32 and extends around the entire circumference of the through hole 71a. Sealing material 5 are assembled.

  That is, when the operating body 42 is moved, the cylindrical guide portion 73 moves together with the operating body 42 and moves in the through hole 71a of the cover portion 71. However, the cylindrical guide portion 73 and the cover portion 71 Even if the operating body 42 is located at the stroke end close to the mounting boss portion 31 of the rotating wheel body 32 as shown in FIG. The guide part 73 does not come off the cover part 71, and the cover part 71 and the cylindrical guide part 73 prevent the waste dust from adhering to the operation part 39 of each blower blade 34 and the operation action part 46 of the operation body 42. And the direction change operation of the air blowing blade 34 is performed while being sealed by the sealing material 74.

[Another embodiment]

  The present invention can be applied not only to the air blower A provided with the engine cooling fan 30 but also to the air blower provided with a ventilation fan for ventilating the inside of the operation cabin. The engine rotation fan 30 and the ventilation fan are collectively referred to as a rotation fan. 30.

Side view of the entire combine Longitudinal rear view of prime mover Cross section plan of the prime mover Front view of engine cooling fan drive structure Cross section of blower Sectional drawing of the arrangement part of the operation body and relay body of an air blower Front view showing the operation part of the blower blade and the arrangement part of the operation body Front view of interlocking structure of operation body and relay body Side view of air blow control device and engine cooling fan (A) is a vertical side view when the blower blades of the engine cooling fan are in the exhaust direction, and (B) is a vertical side view when the blower blades of the engine cooling fan are in the intake direction. (A) is a plan view when the blower blades of the engine cooling fan are in the exhaust direction, and (B) is a plan view when the blower blades of the engine cooling fan are in the intake direction.

Explanation of symbols

3 Engine bonnet 9 Dust removal tool 10 Air inlet 21 Rotation drive shaft 30 Rotating fan 32 Rotating wheel body 34 Blower blade 38 Inner space 39 Operation part 40 Air blowing switching operation mechanism 41 Operation member 42 Operation body 71 Cover part 73 Cylindrical guide part 75 Seal Material

Claims (2)

A blower device including a rotary fan that is rotatably supported by a rotary drive shaft,
The blower blades of the rotary fan are supported by a rotating ring mounted on the rotary drive shaft of the rotary fan so as to be integrally rotatable and can be changed in the direction of intake and exhaust, and the fan blades are supported. An operation unit for changing the direction is provided on the rotating wheel body,
An operating body that engages with the operating portion and is externally fitted to the rotational drive shaft so as to be relatively movable in the axial direction of the rotational drive shaft, and an operating member that is linked to the operating body. An air blow switching operation mechanism configured to move the operating body in the axial direction of the rotation drive shaft and change the direction of the air blowing blade between the intake direction and the exhaust direction by operating the operation member. With
A cover portion that covers an internal space where the operation portion of the rotating wheel body is located is provided on the rotating wheel body so as to be rotatable integrally with the rotating wheel body. The cover portion is concentrically fitted to the rotation drive shaft and the cover portion is relatively movable. A blower device comprising a cylindrical guide portion penetrating through the operating body so as to be integrally rotatable with the operating body, and a sealing material provided between the cover portion and the cylindrical guide portion. The rotary fan is an engine cooling fan, and the intake direction of the blower blade is an attachment direction for sucking engine cooling air through a dust remover at an intake port of the engine bonnet, and the exhaust direction of the blower blade The blower device according to claim 1, wherein the blower is mounted in a direction to blow air toward the dust removing tool.

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