JP2010221832A - Movable agricultural machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable agricultural machine, having a belt tension clutch for driving/stopping a suction fan to draw outside air into an engine room, the clutch which is simplified in structure with increased reliability. <P>SOLUTION: In the movable agricultural machine, an engine 9 is mounted on a machine body with fore and aft engine supports 23a and 23b via engine rubber vibration isolators 25. An electric motor assembly 57 is mounted on the engine support 23b, placed in rear of the machine body, for rotating a tension arm 56 of the belt tension clutch 53. A tension spring 56, urging the tension arm 56 toward a drive side, is provided in front of the machine body opposite the electric motor assembly 57. The belt tension clutch, the electric motor assembly 57 and the tension spring 56 are provided on the engine side in common vibration, and the electric motor assembly 57 and the tension arm 56 are interconnected with a drive link 62. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mobile agricultural machine such as a combine, a tractor, or a rice planting machine, and more particularly to a mobile agricultural machine that drives a suction fan based on power from an engine and introduces outside air into an engine room.

  In general, a combine is formed with an engine room that houses an engine below a driver seat provided at the front of the fuselage, and the engine projects a crankshaft to the inside of the fuselage to drive a crawler traveling device or the like. In addition to transmitting power to working machines such as the pre-processing section and threshing section, the power is also transmitted to the drive system auxiliary equipment such as alternators and water pumps that project outside the machine body, and suction fans that draw outside air into the engine room. is doing.

  Conventionally, in such a combine, in order to remove dust adhering to a dustproof cover provided at an intake port of an engine room, a belt tension clutch is provided on a transmission belt so that the suction fan can be driven / stopped. At the same time, a combine having an electric fan that blows air toward the dustproof cover has been devised (see Patent Document 1).

  In this device, an electric motor for operating the belt tension clutch is provided on the machine body side, an electric motor assembly provided on the machine body side and a tension arm of a belt tension clutch supported on the engine side are connected by a wire, and a tension roller is connected. The power transmission of the suction fan is connected / disconnected by making contact / separation.

JP-A-2005-153643

  When the belt tension clutch and the electric motor assembly for operating the belt tension clutch are arranged separately at different vibration positions, for example, the machine body side and the engine side, as in the combine described in Patent Document 1, the machine body side and the engine side are arranged. Due to the difference in vibration, a load is always generated in the connecting member that connects the electric motor and the tension clutch, causing a failure or adversely affecting the operability of the clutch. In addition, when a buffer mechanism that absorbs the vibration difference is provided, the structure may be complicated.

  Therefore, an object of the present invention is to provide a mobile agricultural machine that solves the above problems by providing an electric motor assembly and a tension clutch on the same vibration side.

The invention according to claim 1 includes an engine (9) housed in the engine room (7), a suction fan (45) that rotates by the power from the engine (9) and introduces outside air into the engine room. The belt tension clutch (53) that drives / stops the suction fan (45) by tightening the transmission belt (52) of the suction fan transmission system (B) that drives the suction fan (45) by the tension roller (55). In a mobile farm machine (1) provided with
A tension arm (56) for supporting the tension roller (55), and an electric motor assembly (57) having an electric motor (63) for rotating the tension arm (56),
The engine (9) is attached to the airframe (3) via a vibration isolation member (25), and the electric motor assembly (57) is attached to the engine side of the vibration isolation member (25).
It exists in the mobile agricultural machine (1) characterized by this.

According to a second aspect of the present invention, the electric motor assembly (57) includes a connection member (62) for connecting the electric motor (63) and the tension arm (56),
A tension spring (59) for urging the tension arm (56) toward the drive side is provided in a row with the connection member (62), and
The connecting member (62) and the tension spring (59) are arranged to face each other with the tension arm (56) interposed therebetween.
It exists in the mobile agricultural machine (1) of Claim 1.

According to a third aspect of the present invention, the engine (9) is supported through the vibration isolation member (25) at two locations on the front side and the rear side of the machine body,
Of the engine support (23a, 23b) interposed between the vibration isolating member (25) and the engine (9), the tension spring (59) is provided on the engine support (23a) on the front side, and the rear side The electric motor assembly (57) is attached to the engine support (23b).
It exists in the mobile agricultural machine (1) of Claim 1 or 2.

  In addition, although the code | symbol etc. in a parenthesis is for contrast with drawing, it does not have any influence on a claim by this.

  According to the first aspect of the present invention, by providing the belt tension clutch and the electric motor assembly for driving the belt tension clutch on the engine side through the vibration isolation member, the belt tension clutch and the electric motor assembly are provided. The same vibration can be achieved. As a result, no difference in vibration occurs in the connecting member that connects the electric motor and the belt tension clutch, and the load applied to the connecting member is reduced, so that the reliability of clutch operation can be improved.

  According to the second aspect of the present invention, by arranging the connecting member and the tension spring so as to face each other with the tension arm interposed therebetween, the space on the side facing the electric motor assembly can be used effectively, which is simple and compact. The tension spring can be easily adjusted while being configured.

  According to the invention of claim 3, by providing the tension spring and the electric motor assembly on the front and rear engine supports, the electric motor assembly and the tension spring have the same vibration, and due to the vibration difference between the electric motor and the tension spring. It is possible to prevent the load from being applied to each other via the tension arm.

The side view of the combine which concerns on embodiment of this invention. The front view which shows the layout in the engine room which concerns on embodiment of this invention. The top view of FIG. The right view of the engine which concerns on embodiment of this invention. The perspective view of FIG. The disassembled perspective view of FIG. The perspective view of the attachment part of the suction fan which concerns on embodiment of this invention. FIG. 8 is an exploded perspective view of FIG. 7. Sectional drawing of FIG. The perspective view of the cooling device which concerns on embodiment of this invention. FIG. 11 is an exploded perspective view of FIG. 10. The right view of FIG. The power transmission diagram which concerns on embodiment of this invention. The right view of the engine which shows the time of clutch engagement effect | action. The right view of the engine which shows the time of clutch disengagement action.

  Below, the combine which concerns on embodiment of this invention is demonstrated based on drawing. Note that the direction in the description is based on the state where the operator is seated on the aircraft.

[Outline of combine]
As shown in FIG. 1, a combine (mobile farm machine) 1 has a machine body 3 supported by a pair of left and right crawler traveling devices 2, 2, and a pretreatment unit 5 can be raised and lowered in front of the machine body 3. Is provided. A cabin 6 on which a worker performs a driving operation is provided on the side of the pre-processing unit 5, and an engine room 7 in which an engine 9 is accommodated is located below a driver seat (not shown) in the cabin 6. positioned. The engine room 7 is opened on the right side surface of the airframe 3 where the door 10 of the cabin 6 is provided, and an engine cover 11 is attached to the opening so as to be freely opened and closed.

  As shown in FIGS. 2 and 3, the engine room 7 is provided with cooling devices such as a radiator 12, an oil cooler 13, and a condenser 15, which will be described in detail later, in addition to the engine 9. Inside the frame of the cover 11, outside air is introduced into the engine room 7 in order to cool the fluid to be cooled by the cooling devices 12, 13, 15 (coolant, engine oil, mission oil, air conditioner refrigerant, etc.). It serves as an intake port 19 for the purpose. The intake port 19 is provided with a dustproof cover 20 formed in a net shape so that foreign matter is not sucked into the engine room 7 together with outside air.

[Configuration in the engine room]
Next, the configuration in the engine room will be described in detail. As shown in FIGS. 4 to 6, the airframe 3 has a pair of airframe lateral frames 21a and 21b arranged side by side in the front-rear direction, and mounting brackets 22 and 22 on the left and right of the airframe lateral frames 21a and 21b. Is provided. Engine supports 23 a and 23 b are attached to the mounting brackets 22 and 22, and the engine 9 is fixed to the engine supports 23 a and 23 b with bolts and mounted on the body 3. Further, an engine vibration isolating rubber (vibration isolating member) 25... Is interposed between the bracket 22 and the engine supports 23a and 23b, so that the vibration of the engine 9 is transmitted to the body 3 or from the body 3. It is not transmitted to the engine 9.

  A crankshaft 26 (see FIG. 13) that is an output shaft protrudes from the left and right side surfaces of the engine 9, and a first drive pulley 27 and a second drive are connected to the crankshaft 26 that protrudes from the right side surface that is outside the machine body. Two drive pulleys comprising a pulley 29 are provided. The engine 9 is provided with drive system auxiliary equipment such as a water pump 30 and an alternator 31, and as shown in FIGS. 7 to 9, a drive shaft (support shaft) 32 (hereinafter, referred to as the water pump 30). The water pump pulley 35 is fixed to the water pump shaft by bolts 33.

  The water pump pulley 35 has a single boss structure, and a fan pulley 37 is loosely fitted to the boss portion 35a via a bearing 36. Further, a shaft portion 35b projects from the center of the boss portion 35a of the water pump pulley 35, and the shaft hole 35b is fitted with a center hole of the fan pulley 37 and is provided with a bearing 39. Yes. A boss 41 is attached to the side surface of the fan pulley 37 by four bolts 40... And a suction fan boss 42 is interposed between the boss 41 and the fan pulley 37 and fixed to the fan pulley 37. Has been. The suction fan boss 42 and the boss 41 are configured to be rotatable with respect to the water pump pulley 35 by a bearing 39 provided on the shaft portion 35b, and thereby extend from the suction fan boss 42 in the circumferential direction. The wing portion 43 is configured to be rotatable independently of the water pump pulley 35. The fan pulley 37, the suction fan boss 42, the wing portion 43, and the like constitute a suction fan 45 that introduces outside air into the engine room 7.

  A nut 46 is screwed onto the tip of the shaft portion 35b to prevent the bearing 39 from coming off, and a liner 47 is interposed between the bearing 39 and the fan pulley 37. A washer 49 is interposed between the nut 46 and the bearing 39.

  An alternator pulley 50 is also provided on the drive shaft 31a of the alternator 31. The pulleys 35 and 50 of the drive system auxiliary machines 30 and 31 including the alternator pulley 50 and the water pump pulley 35 are provided on the engine side. An auxiliary machine drive belt (power transmission belt) 51 is wound between the first drive pulley 27 and the first drive pulley 27. Further, a fan drive belt (transmission belt) 52 is wound between the second drive pulley 29 provided on the outer side of the machine body and the fan pulley 37. Thus, the auxiliary transmission system A that transmits power to the drive system auxiliary machines 30 and 31 through the first drive pulley 27 and the auxiliary machine drive belt 51, and the suction through the second drive pulley 29 and the fan drive belt 52. A suction fan transmission system B for transmitting power to the fan 45 is configured independently. Power from the engine 9 is always transmitted to the drive system auxiliary machine composed of the water pump 30 and the alternator 31 by the auxiliary transmission system A.

  On the other hand, a belt tension clutch 53 is provided on the transmission belt (fan drive belt) 52 of the suction fan transmission system B, and the suction fan 45 cuts off the power of the suction fan transmission system B by the belt tension clutch 53. It is configured to be able to drive / stop. The belt tension clutch 53 of the suction fan transmission system B includes a tension roller 55 that is brought into rolling contact with the fan drive belt 52, a tension arm 56 that supports the tension roller 55 in a swingable manner, and the tension arm 56. An electric motor assembly 57 that rotates, a tension spring 59 that urges the tension arm 56 toward the fan drive belt that is the drive side, and a plurality of belt guides 61, 76, 77, 79, and 80 that guide the fan drive belt 52. , Is composed of.

  The tension arm 56 is formed of a substantially L-shaped plate member, and a corner portion thereof is rotatably supported by a tension arm rotation shaft (rotation fulcrum) 60 provided coaxially with the crankshaft 26. . A tension roller 55 is attached to the tip of the longitudinal arm, and the tension roller 55 is in rolling contact with the inner peripheral surface of the fan drive belt 52 from the inside to the outside. In addition to the tension roller, a belt guide 61 formed in a substantially U-shape is provided at the tip of the longitudinal arm, and the belt guide 61 sandwiches the fan drive belt 52. Thus, the belt 52 is guided from the outer peripheral surface side opposite to the tension roller 55.

  Further, a projection 56b is formed at the tip of the short arm, and the projection 56b is fitted into a long hole 62a provided at the tip of the drive link (connection member) 62 of the electric motor assembly 57. A tension arm 56 and an electric motor assembly 57 are connected. The electric motor assembly 57 includes the electric motor 63, a plate-like electric motor bracket 66 in which the electric motor 63 is attached and a notch 66 a for guiding the rotating arm 65 is formed, and the drive connected to the rotating arm 65. The electric motor bracket 66 includes a link 62, and a bolt 71 in such a manner that the electric motor 63 is sandwiched between a mounting plate 74 formed integrally with the engine support 23b on the rear side of the machine body through the collar 69. It is fixed so that it can be detached and attached by the unit of.

  On the other hand, a mounting plate 72 is detachably attached to the engine support 23a in front of the machine body by bolts, and a mounting seat 73 for a tension spring 59 is provided on the mounting plate 72. A rod 75 for attaching one end of the tension spring 59 is detachably attached to the tip of the mounting seat 73 and can be adjusted by a nut. The other end of the tension spring 59 is on the short side of the tension arm 56. Installed on the arm.

  Therefore, the drive link 62 and the tension spring 59 of the electric motor assembly 57 are arranged in a row so as to oppose the front and rear engine supports 23a and 23b with the tension arm 56 interposed therebetween so that the tension directions are opposite. Yes. In addition, the tension arm mounting portions (protrusions) 56a and 56b of the electric motor assembly 57 and the tension spring 59 are vertically aligned so that the longitudinal position of the tension arm rotating shaft 60 is substantially the same as that of the machine body. In order to apply force in parallel (perpendicular direction) to the tension arm, the heights of the mounting portions 56a and 56b and the mounting position on the engine support side are substantially the same. It is configured.

  Further, the attachment portion 56b on the tension arm side of the drive link 62 is disposed on the tip side of the tension spring 59, and the distance from the tension arm rotation shaft 60 is increased (L> S) (FIG. 4). Reference), the load of the electric motor 63 due to the urging force of the tension spring 59 is reduced, and the stroke of the tension spring 59 due to the swinging of the tension arm 56 is shortened.

  Further, two belt guides 76 and 77 for guiding the front side of the fan drive belt 52 are mounted on the mounting plate 72 of the aircraft front side engine support 23a, and the upper side belt guide 76 has the fan pulley 37 attached thereto. The lower side of the fan pulley 37 is guided from the outer peripheral side of the fan drive belt 52 at a position substantially opposite to the belt guide 61 attached to the front end of the tension arm 56 with being sandwiched. On the other hand, the lower belt guide 77 extends from the front side of the second drive pulley 29 along the lower side, and guides the fan drive belt 52 so that it does not sag forward and downward.

  Further, on the rear side of the fan drive belt 52, in addition to the belt guide 61, a belt guide 79 for guiding the fan drive belt 52 below the second drive pulley 29 is provided on the short arm of the tension arm 56. At the same time, a belt guide 80 for guiding the fan drive belt 52 at a height substantially at the center of the fan pulley 37 is attached to the engine 9.

[Configuration of cooling device]
Next, the cooling device will be described. As shown in FIGS. 2 and 3, the cooling device is arranged in a line in the order of the radiator 12, the oil cooler 13, and the condenser 15 from the suction fan (engine) side to the engine cover (intake port) side. Each having a plurality of cooling fins for cooling the fluid to be cooled.

  Further, an electric fan 81 that is an axial fan that blows air from the engine side to the intake port side is provided between the radiator 12 and the oil cooler 13, as opposed to the suction fan 45 described above, and the condenser 15. A receiver dryer 82 for removing the dirt and moisture of the liquefied refrigerant and temporarily storing the refrigerant is disposed on the rear side (side) of the refrigerant.

  As shown in FIGS. 10 to 12, the oil cooler 13 is fixed by attaching an oil cooler support member 83 to the shroud 12 a of the radiator 12 fixed to the airframe 3 by a bolt, and the capacitor 15 is also a capacitor support member 85. Are fixed to the shroud 12a of the radiator 12 by bolts from the engine cover side of the oil cooler 13.

  The oil cooler support member 83 also supports the electric fan 81. The oil cooler 13 is supported on the engine cover side of the oil cooler support member 83, and the electric fan 81 is supported on the engine side.

  Further, the electric fan 81, the oil cooler 13 and the condenser 15 are effective areas excluding the center of the electric fan 81 and the handle portion of the dust-proof cover 20 so that the electric fan 81 can uniformly blow air to the dust-proof cover 20. It is attached to the shroud 12a of the radiator 12 so as to coincide with the center of the part, and the position is offset in the front-rear direction of the airframe from the suction fan 45 provided substantially at the center of the engine room 7.

  Further, the oil cooler 13 and the condenser 15 on the engine cover side of the electric fan 81 are sized so that the electric fan 81 is hidden behind the electric fan 81 (so that the electric fan 81 is located within the projection area from the intake port 19 side). In addition, the electric fan 81 is positioned substantially at the center of the oil cooler 13 and the condenser 15 so that the electric fan 81 cannot be seen from the intake port side even when the engine cover 11 is opened.

[Action]
Next, the operation of the combine according to the present embodiment will be described.

  As shown in FIG. 13, when the engine 9 is started and the crankshaft 26 is rotated, the first drive pulley 27 provided on the crankshaft 26 is rotated, and the water pump pulley 35 and the auxiliary pump drive belt 51 are rotated. Power is transmitted to the alternator pulley 50. Then, the drive shafts (water pump shaft 32 and alternator shaft 31a) of the drive system auxiliary machines 30 and 31 are rotated by the water pump pulley 35 and the alternator pulley 50, and the water pump 30 and the alternator 31 are driven. Power from the engine 9 is always transmitted to these drive system auxiliary machines 30 and 31 via the auxiliary machine transmission system A.

  On the other hand, when the crankshaft 26 rotates, the second drive pulley 29 also rotates, and power is transmitted to the fan pulley 37 by the fan drive belt 52. Then, the suction fan 45 rotates and the outside air is sucked into the engine room 7 from the intake port 19 of the engine cover 11, and this outside air passes between the condenser 15, the oil cooler 13, and the cooling fins of the radiator 12. The fluid to be cooled of these cooling devices 12, 13, 15 is cooled.

[Operation at work]
Then, when the worker starts a harvesting operation by connecting (engaging) a working machine clutch (not shown) such as a threshing clutch or a working machine clutch, a control unit (not shown) starts dust removal control, When the timer (first timer) elapses, a control signal is output to the electric motor 63. When the control signal is output, the electric motor 63 rotates the rotating arm 65 along the notch 66a, and pulls the drive link 62 against the urging force of the tension spring 59 to the rear side of the machine body. 15 to the cutting position in FIG.

  Then, the tension arm 56 of the belt tension clutch 53 is rotated to the inner peripheral side (the front side of the machine body), and the fan drive belt 52 is moved from the outer peripheral side to the inner peripheral side by the belt guide 61 provided at the distal end portion of the tension arm 56. Is pressed toward. When the fan drive belt 52 is pressed toward the inner peripheral side, the front and rear sides of the fan pulley 37 are pressed by the belt guides 76 and 80. The power of system B is cut off.

  At this time, not only the tension roller 55 that is in rolling contact with the fan drive belt 52 from the inner peripheral side toward the outer peripheral side is moved in the direction of detachment, but the fan drive belt 52 is pressed toward the inner peripheral side by the belt guide 61. Therefore, the fan drive belt 52 is guided inward without coming off, and the clutch is surely disconnected. Further, since the fan drive belt 52 is guided (supported) by belt guides 77 and 79 below, the belt does not move downward due to gravity.

  When the power of the suction fan transmission system B is cut off, the rotation of the fan pulley 37 stops and the rotation of the suction fan 45 stops. A control signal is also output from the control unit to the electric fan 81 simultaneously with the electric motor 63, and when the suction fan 45 stops, the electric fan 81 starts rotating. When the electric fan 81 starts to rotate, it is blown to the dustproof cover 20 through the oil cooler 13 and the cooling fins of the condenser 15 interposed in the air passage, and the dust attached to the dustproof cover 20 is removed. Is done.

  Since the electric fan 81 is an axial fan, its blowing force is strong on the outer peripheral side of the fan and weak on the center side. However, the flow is restricted by the cooling fins of the oil cooler 13 and the condenser 15, so Since the portion passes between the cooling fins on the center side, the wind force on the center side is strengthened and the dustproof cover 20 is blown substantially uniformly, and the dust on the dustproof cover 20 is biased not only on the outside of the fan but also on the fan center side. It is removed without.

  When the electric fan 81 is driven for a certain period (second timer), a control signal is output from the control unit to stop the electric fan 81 and drive the electric motor 63 to connect the belt tension clutch 53. Move to position (position in FIG. 14). When the drive link 62 moves to the front side of the machine body by the electric motor 63, the short side arm is urged to the front side of the machine body by the urging force of the tension spring 59, and the machine body around the tension arm rotation shaft 60. Rotate backward. Then, the tension roller 55 presses the fan drive belt 52 from the inner peripheral side to the outer peripheral side to apply tension, and power is transmitted to the fan pulley 37 to rotate the suction fan 45. While the work implement clutch is connected, the control unit repeats the first timer and the second timer to perform harvesting work while removing dust from the dustproof cover 20.

  Since the auxiliary machine transmission system A and the suction fan transmission system B are configured independently, the belt tension clutch 53 is in the disconnected position (position in FIG. 15), and the power transmission of the suction fan transmission system B is performed. The power is always transmitted to the drive system auxiliary machines 30 and 31 even when disconnected.

[Action at the time of failure]
On the other hand, if the electric motor 63 fails when the belt tension clutch 53 described above is in the disconnected position, the tension motor 56 is fixed at the disconnected position because the electric motor 63 is a wiper motor, and the power transmission of the suction fan transmission system B is disconnected. As a result, the suction fan 45 cannot be driven.

  Then, the operator stops the engine 9 and opens the engine cover 11, and shifts the position of the radiator 15 to which the condenser 15 and the oil cooler 13 with the electric fan 81 hidden on the back are attached. Then, the three bolts 71 to which the electric motor assembly 57 is attached are removed from the engine support 23b on the rear side.

  When the electric motor assembly 57 is removed, the tension arm 56 is moved to the connection position by the urging force of the tension spring 59, and the worker continues the harvesting operation in this state, and repairs the electric motor assembly after the operation.

  As described above, of the engine supports 23a and 23b attached to the brackets 22 and 22 of the aircraft lateral frames 21a and 21b via the engine vibration isolator rubber 25 ..., the tension spring 59 is applied to the engine support 23a on the front side of the aircraft. And the electric motor assembly 57 is attached to the engine support 23b on the rear side of the machine body, so that the belt tension clutch 53, and the electric motor assembly 57 and the tension spring 59 connected to the belt tension clutch 53 can have the same vibration. .

  Therefore, a load based on a vibration difference does not occur in the drive link 62 that connects the electric motor 63 and the tension arm 56, the reliability of the clutch is improved, and the electric motor 63 and the tension arm 56 are connected by a link mechanism. Together with this, the operability of the clutch has also been improved. Furthermore, since it is not necessary to connect via a buffer structure that absorbs vibration differences, a simple structure can be achieved and the reliability of the apparatus can be improved.

  Further, since the tension spring 59 also has the same vibration as the belt tension clutch 53, an extra load on the tension spring 59 due to a vibration difference can be reduced. Furthermore, by arranging the tension spring 59 so as to face the electric motor assembly 57, the space around the engine support 23a on the front side of the electric motor assembly 57 can be effectively utilized, and the configuration becomes simple and compact. The tension spring 59 can be easily adjusted.

  In addition, the rod 75 for attaching the end of the tension spring 59 on the engine support side is configured to be detachable from the mounting seat 73, so that the tension spring 59 is temporarily assembled to the rod 75 and then attached with the rod 75. Since it can be attached to the seat 73, the assemblability is improved. Further, the rod 75 can be used as an attachment portion such as a belt guide.

  Further, by providing a belt guide 61 for guiding the fan drive belt 52 from the outside at the tip of the tension arm 56, when the belt tension clutch 53 is connected, the outer periphery of the belt is guided so that the fan drive belt 52 The clutch 37 can be prevented from coming off from the pulley 37, and the clutch can be assisted by pressing the belt toward the inner periphery during the cutting.

  In addition, the belt guides 76 and 80 are provided below or at the center of the front and rear portions of the fan pulley 37, so that the fan drive belt 52 can be surely loosened to the upper side of the fan pulley 37. Furthermore, by guiding the lower portion of the second drive pulley 29 with the belt guides 77 and 79, it is possible to prevent the transmission belt from being lowered by its own weight.

  The belt guides 61, 76, 77, 79, and 80 cause the tension roller 55 to roll in contact from the inner peripheral side toward the outer peripheral side. Can be reliably prevented, and the clutch can be surely disconnected even if the belt spreads outward due to centrifugal force or the like.

  Further, since the tension arm 56 is always urged to the drive side by the tension spring 59, the operator can remove the electric motor assembly 57 even if the electric motor 63 breaks down and the belt tension clutch 53 is disconnected. Thus, the belt tension clutch 53 can be easily connected. At this time, the tension arm 56 moves to the drive side by the urging force of the tension spring 59, but the fan drive belt 52 is guided to the correct position so that it is not always detached by the belt guides 61, 76, 77, 79, 80. Therefore, the operator can remove the electric motor assembly 57 with peace of mind. Further, since the electric motor assembly 57 is attached by three bolts 71, 71, 71, the operator can easily attach and remove the assembly together.

  In addition, since the oil cooler 13 and the condenser 15 are disposed between the electric fan 81 and the dustproof cover 20, the wind from the electric fan 81 passes between the oil cooler 13 and the cooling fins of the condenser 15 and is dustproof. Since the wind is blown to the cover 20 and the wind force at the center of the fan is strengthened, the dust attached to the dust cover 20 can be uniformly removed. Moreover, since the oil cooler 13 and the condenser 15 rectify the air blown from the electric fan 81, there is no need to newly provide a rectifying plate or the like, and a compact configuration can be achieved.

  Further, since the electric fan 81 is hidden behind the condenser 15 and the oil cooler 13, when the engine cover 11 is opened, even if the electric fan 81 starts to rotate unexpectedly, it can be seen from the operator side. Absent. In addition, since the electric fan 81 and the support member 83 for the oil cooler 13 are also used, a compact configuration can be achieved and the number of parts can be reduced.

  Further, since the auxiliary transmission system A and the suction fan transmission system B are independently configured, the suction fan is constantly transmitted with power from the engine 9 to the drive system auxiliary machines 30 and 31 with a simple and compact configuration. Since 45 can be driven / stopped, it can be easily mounted even in the engine room 7 having a small space. Therefore, the apparatus can be attached to various combines, and versatility is improved. Furthermore, the belt tension clutch 53 can be easily adjusted by providing the suction fan transmission system B outside the machine body.

  Further, since the suction fan 45 is loosely fitted and supported on the water pump shaft 32, there is no need to provide a support member dedicated to the suction fan. Further, since the transmission fan 81 blows air to the dustproof cover 20 when the suction fan 45 is stopped, the dust on the dustproof cover can be efficiently removed.

  In the present embodiment, the transmission system of the suction fan of the combine has been described. However, any mobile farm machine that drives the suction fan by the power of the engine may be used. For example, a tractor, a rice planting machine, etc. Can be applied to.

  The drive link 62 has a long hole 62a fitted and attached to the protrusion 56b of the tension arm 56, and the front end of the long hole 62a and the protrusion 56b are always in contact with each other. The position of the arm 56 was operated, but when the belt tension clutch 53 is connected, the protrusion 56b and the long hole 62a are not in contact (for example, the protrusion 56b is positioned substantially at the center of the long hole 62a). The reaction force from the fan drive belt 52 and the biasing force of the tension spring 59 may be balanced. Further, a wire may be used instead of the drive link 62, and the wire may be loosened when the belt tension clutch 53 is connected.

  As a result, it is possible to prevent the load from the fan drive belt side from being applied to the electric motor 63 due to the pulsation of the engine and the like, and the urging force of the tension spring 59 is stronger than the holding force of the electric motor 63 when not energized. This makes it possible to easily control the belt tension clutch by setting the operating direction of the electric motor 63 only to the pulling side, that is, the rear side of the machine body.

  In addition, although the electric fan 81 is provided as a dust removing device for removing dust from the dust-proof cover 20 while the suction fan 45 is stopped, the removing device is not limited to the electric fan 81, and the dust-proof cover 20 includes The suction fan 45 may be reversely rotated by a vibrator device that applies vibration, or a power device such as an electric motor or HST. In particular, the dust removing device may be omitted, and the dust attached to the dustproof cover 20 by the vibration of the airframe 3 may be removed.

  Further, the times of the first and second timers may be set as appropriate in consideration of the size of the engine, the amount of heat generated, and the like, and the dust removal control may be forcibly operated with a switch or the like. .

1 Mobile agricultural machine (combine)
7 Engine room 9 Engine 23a Front side engine support 23b Rear side engine support 25 Engine vibration isolation rubber (vibration isolation member)
45 Suction fan 52 Fan drive belt (power transmission belt)
53 Belt tension clutch 55 Tension roller 56 Tension arm 57 Electric motor assembly 59 Tension spring 62 Drive link (connection member)
63 Electric motor 81 Electric fan 83 Support member B Suction fan transmission system

Claims (3)

An engine housed in the engine room, a suction fan that rotates by power from the engine and introduces outside air into the engine room, and a transmission belt of a suction fan transmission system that drives the suction fan are tightened by a tension roller. In a mobile agricultural machine comprising a belt tension clutch for driving / stopping the suction fan,
A tension arm that supports the tension roller; and an electric motor assembly having an electric motor that rotates the tension arm.
The engine is attached to the airframe via a vibration isolation member, and the electric motor assembly is attached to the engine side of the vibration isolation member.
A mobile agricultural machine characterized by that. The electric motor assembly includes a connection member that connects the electric motor and the tension arm,
A tension spring for urging the tension arm toward the drive side is provided in a row with the connection member,
These connecting members and tension springs are arranged to face each other with the tension arm in between.
The mobile agricultural machine according to claim 1. The engine is supported via the vibration isolation member at two locations on the front and rear sides of the fuselage,
Among the engine supports interposed between these vibration-proof members and the engine, the tension spring is provided on the front engine support, and the electric motor assembly is attached to the rear engine support.
The mobile agricultural machine according to claim 1 or 2.

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