JP2017198171A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To configure an arrangement structure of a radiator fan and a normal/reverse rotation switch mechanism with a simple structure, when the radiator is arranged at a position separated from an engine.SOLUTION: A normal/reverse rotation switch mechanism 6 provided in a power transmission system from an engine 3 to a radiator fan 70 is configured to switch a rotating direction of the radiator fan 70 between a normal rotation state drawing cooling air to the radiator fan 70 side through a ventilation surface of a radiator 7 and a reverse rotation state blowing off the cooling air from the radiator fan 70 side to the ventilation surface side. An actuator 100 is provided, which can switch the normal rotation state and the reverse rotation state by the normal/reverse rotation switch mechanism 6. The radiator fan 70, the normal/reverse rotation switch mechanism 6, and the actuator 100 are supported by a cooling portion supporting frame 8 positioned at a place separated from the engine 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a radiator fan that can be selectively switched between a normal rotation state and a reverse rotation state, and a forward / reverse switching mechanism that switches the rotation direction of the radiator fan forward and backward.

As a working machine provided with a radiator fan capable of forward / reverse rotation and a forward / reverse switching mechanism for rotating the radiator fan forward / reversely, there is one having the following structure.
That is, a first transmission belt wound around an output pulley of the engine and an input pulley of the radiator fan, an inscribed ring body that can contact the first transmission belt in an inscribed state, and an external connection to the first transmission belt And a second transmission belt wound around the inner ring body, the outer ring body, and the input pulley of the radiator fan. The inner ring body and the outer ring body are mounted on a rocking body that can rock around the same axis as the rotation axis of the input pulley of the radiator fan.
In the forward / reverse switching mechanism configured as described above, by swinging the oscillating body, the forward rotation state in which the inscribed ring body is brought into contact with the first transmission belt and the external connection with respect to the first transmission belt are provided. It can be switched to a reverse rotation state in which the ring body is in contact (see Patent Document 1).

Japanese Patent Laid-Open No. 2001-263063 (paragraphs [0022, 0023], FIGS. 2 to 5)

In the structure described in Patent Document 1, the radiator fan is equipped with a transmission belt and transmission pulley dedicated to the forward drive system, and a transmission belt and transmission pulley dedicated to the reverse drive system, respectively. This is useful in that the structure can be simplified and the size can be reduced.
However, in this structure, the output pulley of the engine and the input pulley of the radiator fan are both supported on the engine side and are arranged together at the lateral side position of the engine. However, there is room for improvement in that it cannot be disposed at a position off the lateral side of the engine and is difficult to adopt when changing the position of the radiator.

  The present invention is intended to simplify the arrangement structure of the radiator fan and the forward / reverse switching mechanism when the radiator is arranged at a position away from the engine.

  The working machine according to the present invention includes an engine, a radiator that cools the engine, and a radiator fan that is rotationally driven by the power of the engine, and power transmission from the engine to the radiator fan. A forward / reverse switching mechanism is provided in the system, and the forward / reverse switching mechanism changes the rotation direction of the radiator fan disposed facing the radiator from the side opposite to the side where the radiator fan exists. It is configured to be switchable between a normal rotation state in which cooling air is drawn through the surface to the radiator fan side and a reverse rotation state in which cooling air is blown from the radiator fan side to the ventilation surface side, and a normal rotation state by the forward / reverse switching mechanism And an actuator capable of switching between a reverse state and a reverse fan state, the radiator fan, the forward and reverse Switching mechanism, and the actuator is that it is supported by the cooling unit support frame located at a position remote from the engine.

According to the present invention, the radiator fan, the forward / reverse switching mechanism, and the actuator for switching the forward / reverse switching mechanism are supported by the cooling unit support frame at a position away from the engine. Thereby, the relative positional relationship among the radiator fan, the forward / reverse switching mechanism, and the actuator can be freely set on the cooling unit support frame regardless of the position with respect to the output unit of the engine.
Therefore, as the transmission mechanism from the engine output section to the input section of the forward / reverse switching mechanism, it is easy to adopt a freely disposed position and structure, and the radiator fan, forward / reverse switching mechanism, and actuator disposed position and its There is an advantage that the support structure can be easily set.
The radiator fan, forward / reverse switching mechanism, and actuator are supported together by the cooling unit support frame in a state in which the positional relationship is properly maintained, so that the engine output unit is connected to the input unit of the forward / reverse switching mechanism. Without being affected by the distance to reach, the structure of the transmission mechanism, manufacturing accuracy, etc., it is easy to place it at an appropriate position with high accuracy.

  In the present invention, the cooling portion support frame is provided with a fan support portion that pivotally supports the fan main shaft of the radiator fan, and an extended arm portion that is cantilevered from the fan support portion. It is preferable that an actuator support portion on which the actuator can be mounted is provided at the free end side portion.

  By providing this configuration, the actuator support part is provided on the extended arm part whose positional relationship with the fan support part is fixed, so the actuator is arranged with the positional relationship with the fan support part set accurately. It is easy.

  In the present invention, the actuator support portion is disposed on the opposite side of the fan support portion from the input portion of the forward / reverse switching mechanism to which power is transmitted from the output portion of the engine via the transmission mechanism. It is preferable that

  With this configuration, the actuator support portion and the input portion of the forward / reverse switching mechanism are arranged in a state of being distributed to both sides with the fan support portion interposed therebetween. Thus, the arrangement space around the fan support portion and the weight of the device are distributed to both sides, and the arrangement is easy in a balanced manner.

  In the present invention, the forward / reverse switching mechanism includes an input pulley as an input portion to which power is transmitted from the output portion of the engine via a transmission mechanism, an output pulley mounted on the fan main shaft, and an output pulley thereof. And a transmission belt wound around the input pulley, and the output pulley and the input pulley are preferably attached to the cooling unit support frame.

  With this configuration, since both the output pulley and the input pulley of the forward / reverse switching mechanism are attached to the cooling unit support frame, it is easy to position each other with high accuracy. Therefore, the forward / reverse rotation mechanism including the transmission belt wound around these and the mechanism for operating the transmission belt can be easily configured with high accuracy.

  In the present invention, the forward / reverse switching mechanism includes a circumscribed ring body that can abut on the outer peripheral side of the transmission belt, an inscribed ring body that can abut on the inner peripheral side of the transmission belt, and these circumscribed wheels. A forward / reverse transmission belt wound around a body and an inscribed ring body and the output pulley, and an oscillating body for supporting the outer ring body and the inscribed ring body, wherein the oscillating body includes the fan main shaft. It is preferable that the pivot is pivotally supported around the same pivot axis as the other axis.

  With this configuration, a forward / reverse transmission belt is provided by a rocking body that supports a circumscribed ring body that can contact the outer peripheral side of the transmission belt and an inner ring body that can contact the inner peripheral side of the transmission belt. Thus, the forward / reverse switching mechanism can be easily constructed with a simple structure.

  In the present invention, the actuator includes a rocking operation body that is rocked around another axis in the direction along the rocking axis of the rocking body, and the rocking operation body and the rocking body are connected to each other. It is preferable that the connecting members to be connected are arranged on both sides of an imaginary line segment connecting the swing axis of the swing body and the other axis.

  By providing this configuration, it is possible to operate the rocking body via the connecting member by disposing the actuator at a position away from the location where the rocking body exists and operating the rocking operation body with the actuator. Therefore, the actuator can be arranged at a location away from the position near the oscillating body in which various operation mechanisms are complicated, so that the space can be effectively used and the structure can be simplified.

  In the present invention, the radiator fan is disposed at a higher position on the rear side of the engine, the input portion of the forward / reverse switching mechanism is disposed on the upper front side of the radiator fan, and the rear side of the radiator fan. It is preferable that the actuator is disposed on the lower side.

  By providing this configuration, the input portion of the forward / reverse switching mechanism can be arranged at a high position, and the transmission mechanism from the engine to the input portion can be disposed high on the ground. Accordingly, a large space below the transmission mechanism on the rear side of the engine can be secured to facilitate maintenance around the engine. Nevertheless, since the actuator is disposed on the lower rear side than the radiator fan, it is easy to perform maintenance work from a lower position on the lower rear side without being obstructed by the transmission mechanism and various devices on the front side of the radiator fan. Is.

  In the present invention, a working unit frame for supporting a working unit disposed at a position higher than the radiator fan is erected on the body frame, and the cooling unit supporting frame has the lower end side at the lower end side. It is preferable that the machine body frame is supported and the upper end side is connected to the working unit frame.

  By providing this configuration, the upper end side of the cooling unit support frame can be supported by the working unit frame. Therefore, the support strength of the cooling unit support frame can be increased by effectively using the working unit frame.

  In the present invention, it is preferable that the cooling unit support frame is erected from the body frame at the rear of the body.

  By providing this configuration, it is easy to perform maintenance work and the like from the rear side of the machine body by going around to the rear side of the cooling unit support frame.

  In the present invention, it is preferable that the fan main shaft of the radiator fan is attached to a position shifted in the front-rear direction with respect to the center of the front-rear width of the cooling unit support frame.

  By providing this configuration, the width of the cooling unit support frame in the front-rear direction is reduced by an amount corresponding to the diameter of the fan main shaft, compared to a structure in which the entire fan main shaft is within the width of the cooling unit support frame. You can avoid things. Thus, for example, the front-rear direction of the entire cooling unit support frame is sufficient to compensate for the decrease in strength due to the reduction in anticipation of the reduction in the front-rear width of the cooling unit support frame by an amount corresponding to the diameter of the fan spindle. There is no need to increase the width.

It is a right view of a combine. It is a whole top view of a combine. It is a side view which shows the power transmission structure from an engine to a radiator fan. It is a top view which shows the power transmission structure to a radiator fan. It is a side view which shows the normal transmission state in a forward / reverse switching mechanism. It is a side view which shows the reverse transmission state in a forward / reverse switching mechanism. It is a side view which shows a cooling unit support frame. It is a side view which shows a rocking body. It is an expanded sectional view showing a rocking body and a radiator fan around a fan main axis.

Hereinafter, an exemplary embodiment of the present invention will be described based on the drawings.
In the description of the present embodiment, the front-rear direction and the left-right direction are described as follows unless otherwise specified. That is, the forward travel direction (see arrow F in FIGS. 1 and 2) during work travel of the work implement in the present invention is “front”, and the forward travel direction (see arrow B in FIGS. 1 and 2) is “ The direction corresponding to the right side (see arrow R in FIG. 2) with respect to the forward posture in the front-rear direction is “right”, and the direction corresponding to the left side (see arrow L in FIG. 2) is also “left”. It is.

〔overall structure〕
1 and 2 show an all-throw-in type (ordinary type) combine which is an example of a working machine according to the present invention. FIG. 1 shows the right side of the entire aircraft, and FIG. 2 shows the plane.

As shown in these drawings, the full throw-in type combine has a pair of left and right front wheels 2F, 2F (corresponding to a front traveling device) and a pair of left and right rear wheels 2R, 2R ( A traveling device 2 is provided which corresponds to a rear traveling device.
A driving cabin 15 (corresponding to the driving unit) is provided at the front of the machine body frame 1, a threshing device 4 and a glen tank 5 are provided on the rear side thereof, and a waste straw processing device 16 (a waste wall processing unit is provided in the rear part). Equivalent). The grain tank 5 is equipped with a grain discharging device 54 described later.
Furthermore, a self-propelled machine body is configured with a cutting processing device 17 that moves up and down around a horizontal axis (not shown) along the left-right direction with respect to the machine body frame 1.

  An engine 3 is mounted on the machine body frame 1 at a position corresponding to the right side of the threshing device 4 at the front part of the machine body frame 1. A radiator 7 is disposed at a rear position away from the engine 3, and a fuel tank (not shown) is mounted on the opposite side of the threshing device 4 from the engine 3 or the radiator 7. The power of the engine 3 is transmitted to the threshing device 4, the mowing processing device 17, the radiator fan 70 that cools the radiator 7, and the like, in addition to the traveling device 2 described above.

As shown in FIG. 1, power is transmitted to the front wheels 2F of the traveling device 2 via a front wheel drive shaft (not shown) that extends from the transmission 20 mounted on the front portion of the body frame 1 to the left and right. Is done. In other words, power is transmitted to the front wheel 2F as the drive wheel via the front axle 2a connected to the front wheel drive shaft.
As shown in FIG. 1, the rear wheel 2 </ b> R is located on the left and right of a rear wheel support frame (not shown) mounted on the rear portion of the body frame 1 so as to be swingable left and right around a longitudinal axis (not shown). It is provided on both ends. The rear wheel 2R is constituted by a steering wheel provided with a rear axle 2b that can be steered around a vertical swing axis (not shown).

On the left and right lateral sides of the self-propelled aircraft, there is an exterior cover 9 (on the side cover) so as to cover the aircraft lateral sides located between the front wheels 2F and the rear wheels 2R below the Glen tank 5 Equivalent).
The exterior cover 9 is supported so as to be able to undulate and swing around a swing fulcrum z1 along the front-rear direction provided in the vicinity of the upper end side, the wide cover surface 9A is closed along the vertical direction, and the cover surface 9A is horizontal. An upper cover portion 90 configured to be switchable to an open posture along the direction, and located below the lower edge of the lower edge of the upper cover portion 90 in the closed posture and positioned laterally outside the threshing device 4 and the engine 3 And a lower cover portion 91 arranged to do so. The lower cover portion 91 is not swingably opened / closed around the swing axis z <b> 1 like the upper cover portion 90, but for placing and supporting the glen tank 5 so as to cover the lower side of the engine 3. The tank support 13 (corresponding to the working unit frame) provided is configured to be detachable through an appropriate fitting.

  The mowing processing device 17 is a feeder 17A that supplies crops such as stalks that have been harvested to the threshing device 4, a scraping reel 17B that rakes the crop tips such as planting stalks, and a cutting that cuts the plant side. The apparatus 17C and a lateral feed auger 17D that collects the harvested crops at the center in the cutting width direction are provided, and the crops are harvested, fed into the feeder 17A, and supplied to the threshing device 4.

[Threshing equipment]
As shown in FIG. 2, the threshing device 4 is disposed on the machine body frame 1 so that the handling cylinder rotation axis p0 is along the front-rear direction. This threshing device 4 is arranged in the front-rear direction interval between the front wheel 2F and the rear wheel 2R in the front-rear direction, and is also arranged in a state of being located within the interval width between the left and right front wheels 2F and the rear wheel 2R in the left-right direction. Yes.
Further, as shown in FIG. 1, the threshing device 4 has a lower surface slightly lower than the front axle 2a of the front wheel 2F that is a non-steering wheel and slightly higher than the rear axle 2b of the rear wheel 2R that is a steering wheel. In position. That is, the front axle 2a of the front wheel 2F that is a non-steering wheel or the rear axle 2b of the rear wheel 2R that is a steering wheel is disposed at substantially the same height.
The threshing device 4 arranged in this way is arranged in a state where the barrel rotation axis p0 of the threshing device 4 is biased to the left side with respect to the center line CL in the left-right direction of the machine body. Since the center line in the left-right direction of the threshing device 4 is present at the same position as the front-rear direction handling cylinder rotation axis p0 of the handling cylinder (not shown) disposed therein, the threshing apparatus 4 Is also arranged in a state of being deviated to the left with respect to the center line CL in the left-right direction of the machine body.

  The threshing device 4 is formed in a rectangular box shape that is long in the longitudinal direction of the machine body. Inside, a handling cylinder for threshing the harvested crop fed from the feeder 17A side is provided with a handling cylinder rotation axis p0 in the longitudinal direction. It is arranged to be rotated around. In addition to the handling cylinder, a sorting processing device (not shown) that performs a swing sorting process on the harvested crop that has been threshed by the handling cylinder, and the like are provided along with the air blowing action by the tang (not shown).

[Glen tank]
As shown in FIGS. 1 and 2, the Glen tank 5 is located at the rear side of the operation cabin 15 and on the left side of the tank support base 13 erected on the right side of the body frame 1. A wide tank main body 50 extending over the upper side of the threshing device 4 is provided. The tank body 50 is supported by the tank support 13 and the threshing device 4.
The tank main body 50 is provided with a bottom screw 51 extending in the front-rear direction of the machine body on the right lateral side.

The front end side of the bottom screw 51 is connected to a vertical conveyance unit 52 extending upward from the machine body. A horizontal conveyance unit 53 extending in the horizontal direction is connected to an upper end portion of the vertical conveyance unit 52. By providing the bottom screw 51, the vertical conveyance unit 52, and the horizontal conveyance unit 53, a grain discharging device 54 that discharges the grains stored in the tank body 50 to the outside of the machine is configured. Yes.
The horizontal conveyance unit 53 is supported by the upper end of the vertical conveyance unit 52 so as to be rotatable about the vertical axis y1 and can discharge the grain from the discharge port 53a provided on the free end side of the horizontal conveyance unit 53. It is configured.

  The tank body 50 can swing around the rotational axis z2 of the bottom screw 51 by the expansion and contraction of a hydraulically operated dump cylinder 55 provided across the bottom of the tank body 50 and the lower part of the tank support 13. It is configured. That is, the tank body 50 has a storage posture in which the bottom surface thereof becomes a substantially horizontal posture with the contraction operation of the dump cylinder 55, and a discharge posture in which the bottom surface is inclined with the extension operation of the dump cylinder 55. In addition, the posture can be changed.

As shown in FIG. 1 and FIG. 3, the tank support 13 is disposed on the body frame 1 between the front wheel 2 </ b> F and the rear wheel 2 </ b> R at the right lateral side portion of the threshing device 4.
The tank support 13 connects a plurality of vertical struts 13 </ b> A that are disposed in and out of a position close to the threshing device 4 and a position farther than that, and upper ends of the vertical struts 13 </ b> A. The tank main body 50 is mounted on an upper frame 13B that includes an upper frame 13B and is supported by the vertical support 13A.

As shown in FIGS. 1, 2, and 3, as shown in FIGS. A usable space and a work space s1 that is easy to use for work such as maintenance are provided.
In an area where the device can be used as a device mounting base, the valve unit 27 is provided in a state where the compressor 3C and the compressor 3C are located on the inner side of the compressor 3C, and the compressor unit 3C and the valve unit 27 are positioned behind the compressor unit 3C. A battery 28 is mounted. The working space s <b> 1 is formed between the rear end of the engine 3 and the front end of the radiator 7 on the inner side of the body frame 1 than the lateral outer end of the body frame 1.
The area that can be used as the device mounting base and the work space s1 are covered by the exterior cover 9 located outside thereof when the exterior cover 9 is in the closed position, and the exterior cover 9 is switched to the open position. When it is pushed, the lateral outside is opened.

[Power transmission structure]
Next, a power transmission structure that transmits the power of the engine 3 to the radiator fan 70 and the like will be described.
As shown in FIGS. 2 and 3, the engine 3 is disposed at a position on the right outer side on the body frame 1 with a crankshaft (not shown) along the left-right direction of the body.
As a traveling output unit that outputs power to the transmission 20 of the traveling system together with a flywheel (not shown) on the one end side (the inward side of the engine) of the engine 3 in the left-right direction with the axial direction along the left-right direction of the body Output pulley (not shown).
An output shaft 30 as an output portion projects from the other end side in the left-right direction (outside the fuselage). The pulley 32 and the third output pulley 33 are mounted so as to rotate integrally.

A power generation drive pulley 34 for driving the alternator 3B and a blower fan 3A are provided on the outer side of the body of the engine 3 so as to rotate around a horizontal axis parallel to the axis of the output shaft 30. A blower driving pulley 35 for driving is provided.
As shown in FIG. 3, the first output pulley 31, the power generation drive pulley 34, and the blower drive pulley 35, are configured by a single V-belt that is an example of an endless rotation band. The transmission belt 36 is wound, and the alternator 3 </ b> B and the blower fan 3 </ b> A are rotationally driven as the first output pulley 31 rotates.

  As shown in FIG. 3, the blower fan 3 </ b> A takes in outside air from the outside of the exterior cover 9 through an air supply portion 92 configured by a large number of ventilation holes formed in the exterior cover 9, and It is for spraying.

Of the second output pulley 32 and the third output pulley 33 attached to the output shaft 30, the third output pulley 33 farthest from the engine 3 is formed with a smaller diameter than the second output pulley 32. .
A second transmission belt 37 is wound around the third output pulley 33 so as to transmit a driving force to the compressor 3 </ b> C provided on the rear side of the engine 3.

[Transmission to radiator fan]
As shown in FIGS. 3 to 6, the power transmission to the radiator fan 70 is performed by the third transmission belt 38 wound around the second output pulley 32 attached to the output shaft 30 and the rear side away from the engine 3. The power of the engine 3 is extracted as the driving force of the radiator fan 70 via the relay shaft 41 provided at the top of the motor and the forward / reverse switching mechanism 6 described later.

The relay shaft 41 is provided with a relay input pulley 41a (corresponding to a drive rotating body) at an end portion on the outer side of the machine body (right end part in the left-right direction), and an end part on the inner side of the machine body (left side in the left-right direction). A relay output pulley 41b (corresponding to a drive rotator) is provided at the end). A third transmission belt 38 is wound around the relay input pulley 41 a and the second output pulley 32, and the rotational power of the output shaft 30 is transmitted to the relay shaft 41.
In this way, by using the relay shaft 41, the third transmission belt 38 bypasses the upper part of the equipment mounting base and the working space s1 between the engine 3 positioned in the front and the radiator 7 positioned in the rear. Arranged in a state. Accordingly, the work space s1 can be used as a space that is easy to use for work such as maintenance regardless of the presence of the third transmission belt 38 and the like.

The third transmission belt 38 is provided with a tension mechanism 40 for slack removal on the slack side belt portion. The tension mechanism 40 includes a fixed pulley 40b pivotally supported by a support shaft 40a provided on a part of the vertical support 13A of the tank support base 13. A swing arm 40c that can swing around the support shaft 40a of the fixed pulley 40b is provided, and a free-side pulley 40e that rotates around a support shaft 40d attached to the free end of the swing arm 40c. ing. Furthermore, a coil spring 40f that pulls and urges the swing arm 40c toward the slack eliminating side (upper right side in FIG. 3) is provided.
By providing the fixed pulley 40b, the swing arm 40c, the idler pulley 40e, and the coil spring 40f, the slack removing tension mechanism 40 that constantly urges the third transmission belt 38 to the tension side is configured. Has been.

  A drive belt 42 (corresponding to a transmission mechanism) is stretched across an input pulley 60 serving as an input portion of a forward / reverse switching mechanism 6 that drives the radiator fan 70 forward / reversely and a relay output pulley 41b on the relay shaft 41 side. ing. The forward / reverse switching mechanism 6 will be described later.

[Forward / reverse switching mechanism]
A forward / reverse switching mechanism 6 configured as follows is interposed in the transmission system of the radiator fan 70 for cooling the radiator 7.
As shown in FIGS. 4 to 7, the forward / reverse switching mechanism 6 switches the rotation direction of the radiator fan 70 disposed facing the radiator 7 to the inward side between the forward rotation state and the reverse rotation state. Is.

In the forward rotation state of the radiator fan 70, the rotation direction of the radiator fan 70 is set so that the cooling air is drawn from the side opposite to the side where the radiator fan 70 exists through the vent surface of the radiator 7 to the radiator fan 70 side. State. In this state, the air blowing direction by the radiator fan 70 is directed from the lateral side outward to the inward side, and the suction action by the radiator fan 70 acts on the radiator 7.
The reverse rotation state of the radiator fan 70 is a state in which the rotation direction of the radiator fan 70 is set so that cooling air is blown from the radiator fan 70 side to the ventilation surface side of the radiator 7. In this state, the blowing direction by the radiator fan 70 is directed from the inside of the body to the side of the radiator 7 on the outside of the body, and dust adhering to the ventilation surface existing on the outside of the body of the radiator 7 is cooled with the cooling air. Acts to blow away.

The forward / reverse switching mechanism 6 is connected to an input pulley 60 (corresponding to an input unit) to which power from the output shaft 30 of the engine 3 is transmitted via a drive belt 42 as a transmission mechanism, and to a fan main shaft 71 of the radiator fan 70. An output pulley 61 that is provided so as to be integrally rotatable, and a transmission belt 62 wound around the output pulley 61 and the input pulley 60 are provided. In addition, a circumscribed ring body 63 capable of abutting on the outer peripheral side of the transmission belt 62, an inscribed ring body 64 capable of abutting on the inner peripheral side of the transmission belt 62, the circumscribed ring body 63 and the inner A forward / reverse transmission belt 65 wound around the contact ring body 64 and the output pulley 61, and an outer ring body 63 and an oscillating body 66 that supports the internal ring body 64 are provided.
Further, the space in the winding range of the transmission belt 62 is widened so that a space for operating the swinging body 66 is ensured, and the free play inscribed in the transmission belt 62 at a position away from the input pulley 60 and the output pulley 61 is provided. A rolling pulley 67 and a tension pulley 68 for adjusting the tension force of the transmission belt 62 are provided between the idle pulley 67 and the output pulley 61.

  The oscillating body 66 is pivotally supported by being externally fitted to the fan main shaft 71 so as to be able to oscillate around the same axis as the axis p1 of the fan main shaft 71 and to be relatively rotatable. As shown in FIG. 5, when the swinging body 66 tilts to the lower right in the figure, the inscribed ring body 64 comes into pressure contact with the inner peripheral side of the transmission belt 62. In this state, the rotational force of the transmission belt 62 that rotates clockwise in the figure is transmitted to the inscribed ring body 64, and the forward / reverse transmission belt 65 wound around the inscribed ring body 64 is shown in the figure. Rotate clockwise to rotate the output pulley 61 clockwise. The radiator fan 70 is driven in the forward rotation state by the clockwise rotation of the output pulley 61.

  As shown in FIG. 6, when the rocking body 66 tilts to the upper right in the drawing, the circumscribed ring body 63 comes into pressure contact with the outer peripheral side of the transmission belt 62. In this state, the circumscribed ring body 63 to which the rotational force of the transmission belt 62 that rotates clockwise in the drawing is transmitted rotates counterclockwise in the drawing. As a result, the forward / reverse transmission belt 65 wound around the circumscribed ring body 63 rotates counterclockwise in the drawing, and the output pulley 61 rotates counterclockwise. The radiator fan 70 is driven in the reverse rotation state by the counterclockwise rotation of the output pulley 61.

The forward / reverse switching mechanism 6 is supported by a cooling unit support frame 8 erected on the body frame 1 at the rear of the body. The cooling unit support frame 8 includes an electric motor 100 (actuator) for operating a fan support unit 84 that pivotally supports the fan main shaft 71 of the radiator fan 70 and a swinging body 66 that switches the rotation direction of the forward / reverse transmission belt 65. The actuator support portion 86 is also provided.
The actuator support portion 86 near the place where the electric motor 100 is provided swings around another axis p2 in the direction along the axis p1 of the fan main shaft 71 that is the swing axis of the swing body 66. The swing operation body 101 is equipped. The swing operation body 101 is illustrated with respect to the output shaft (not shown) of the electric motor 100 so that the swing operation body 101 swings around the other shaft center p2 in accordance with the forward / reverse operation of the electric motor 100. It is not mechanically linked via a gear interlocking mechanism as appropriate.

The swing operation body 101 is distributed to both sides of an imaginary line segment that connects the axis p1 of the fan main shaft 71, which is the swing axis of the swing body 66, and the other axis p2 in a side view. The rocking body 66 is connected through a pair of connecting members 102.
Of the pair of connecting members 102, one connecting member 102 is constituted by a coil spring 102a that urges the rocking body 66 clockwise with the rocking body 66 tilted to the lower right as shown in FIG. ing. The coil spring 102a has a biasing force in a direction in which the inner ring body 64 is pressed against the inner peripheral side of the transmission belt 62 in a posture in which the swinging body 66 tilts to the lower right. To maintain.

As shown in FIG. 6, the other connecting member 102 counterclockwise rotates the rocking body 66 so that the outer ring body 63 is pressed against the outer peripheral side of the transmission belt 62 with the rocking body 66 tilted to the upper right. It is comprised by the wire 102b rotated around. In this state, the radiator fan 70 is maintained in the reverse rotation state. At this time, the position of the connection point of the coil spring 102a with respect to the swinging body 66 moves away from the position of the electric motor 100, but the position of the connection point of the coil spring 102a with respect to the swinging operation body 101 also moves away from the electric motor. Moving. Moreover, since the movement amount of the connection point position on the swing operation body 101 side is larger than the movement amount of the connection point position on the swing body 66 side, the distance between the two connection points is shortened, and the tension length of the coil spring 102a is contracted. Thus, the urging force in the clockwise direction decreases.
Thus, when the swinging body 66 is switched from the normal rotation state to the reverse rotation state, the coil spring 102a can be prevented from acting as a large operating resistance like the structure in which the coil spring 102a is further extended. As a result, it is advantageous in that it is not necessary to equip the electric motor 100 with a large output in consideration of the increased resistance of the coil spring 102a.

Forward / reverse rotation of the electric motor 100 is controlled by a control device (not shown). The control device stores a control program input in advance, and is configured to switch between the normal rotation state and the reverse rotation state at predetermined time intervals set in advance based on the control program.
Whether the electric motor 100 is in the normal rotation state or the reverse rotation state is detected by the position of the swinging body 66 around the axis p1 of the fan main shaft 71. That is, the rocking body 66 is connected to the detection link 110a of the switch sensor 110 via the linkage rod 103 as shown in FIGS.
Therefore, when the electric motor 100 is rotated clockwise in the normal rotation state and the swinging body 66 is tilted to the lower right as shown in FIG. 5, the detection link 110 a of the switch sensor 110 is connected via the linkage rod 103. The switch sensor 110 is pulled down and tilted to the lower right, and the switch sensor 110 detects the forward rotation state. Conversely, when the electric motor 100 rotates counterclockwise in the reverse rotation state and the swinging body 66 tilts to the upper right as shown in FIG. 6, the detection link 110 a of the switch sensor 110 is connected via the linkage rod 103. Is pushed up and tilted to the upper right, and the switch sensor 110 detects the forward rotation state.

[Cooling part support frame]
As shown in FIG. 3, a tank support 13 is erected on the body frame 1 on the right lateral side of the threshing device 4, and the radiator support arm 13 </ b> C provided on the tank support 13 and the rear side thereof. The radiator 7 is supported by a lower column 72 erected from the body frame 1.
A cooling unit side plate 73 is provided on the laterally outer side of the radiator 7. The cooling unit side plate 73 is attached to the vertical column 13A at the rear of the tank support 13 via the hinge bracket 14, and is configured to be able to swing open and close around the vertical axis y2. In the portion of the cooling unit side plate 73 facing the ventilation surface of the radiator 7, a large number of ventilation holes that allow passage of cooling air are formed. Therefore, the cooling fan side plate 73 can suck and discharge the cooling air by the radiator fan 70 in a closed posture in which the cooling plate side plate 73 faces the ventilation surface of the radiator 7.

  A radiator fan 70 is disposed on the inner side of the radiator 7 so as to face the ventilation surface of the radiator 7. 3 and 7, the radiator fan 70 is attached to the cooling unit support frame 8 that is erected from the body frame 1 on the rear side of the vertical support 13 </ b> A at the rear of the tank support base 13. Yes.

The cooling unit support frame 8 is provided with an upright column 80 that is fixed to the body frame 1 at the lower end side, extends obliquely forward from the fixing portion, and then stands upward. A front / rear frame member 81 in a front-falling inclined posture in which the front side is slightly lower than the rear side is integrally welded to the upper end side of the upright support column 80.
The lower part of the rear part of the front / rear frame member 81 is connected by a reinforcing bracket 82 near the upper end of the upright column 80. An extension support portion 83 is integrally provided at the front portion of the front-rear frame member 81 in a state of standing upward. This extension support | pillar part 83 is extended to the position higher than the upper edge of the radiator 7, and is equipped with the fixing bracket 83A in the upper end part. Accordingly, the upper end side of the cooling part support frame 8 is connected and fixed to the tank support base 13 by connecting the fixing bracket 83A to the connection part 13D provided at the rear part of the upper frame 13B of the tank support base 13. It is configured to be possible.

  A fan support 84 that pivotally supports the fan main shaft 71 of the radiator fan 70 is provided at an intermediate portion in the vertical direction of the upright support 80. As shown in FIG. 7, the fan support portion 84 is welded and fixed so that the cylindrical boss 84 </ b> A that pivotally supports the fan main shaft 71 partially enters from the rear side into the front-rear direction width of the upright support portion 80. Yes. Therefore, the fan main shaft 71 is pivotally supported by the fan support portion 84 in a state in which the axis p1 is misaligned in the front-rear direction with respect to the center of the up-down width of the upright support column 80.

On the rear side of the upright support column 80, an extending arm portion 85 is extended in a cantilevered manner from the fan support portion 84 toward the lower rear side. An actuator support portion 86 to which the electric motor 100 can be mounted is provided at the free end side portion of the extension arm portion 85.
The extension arm portion 85 includes an upper arm 85A having an L-shaped cross section located on the upper side and a lower arm 85B having an L-shaped cross section located on the lower side, and the free ends of the upper arm 85A and the lower arm 85B are connected to each other. An actuator support portion 86 is provided in a connected state.
The base end side of the upper arm 85 </ b> A is welded and fixed across the outer peripheral surface of the cylindrical boss 84 </ b> A in a state protruding from the width in the front-rear direction of the upright column 80 and the rear surface of the upright column 80. Thereby, it will also play a role as a reinforcing member at the support location of the cylindrical boss 84A in a state of protruding from the front-rear direction width of the upright column 80 to the rear side. The base end side of the lower arm 85B is welded and fixed to the rear surface and the side surface of the upright support column 80.

An input pulley 60 as an input part of the forward / reverse switching mechanism 6 is rotatably supported at the front end of the front / rear frame part 81.
The location where the input pulley 60 exists is disposed so as to be located on the opposite side to the extending direction of the extending arm portion 85 including the actuator supporting portion 86 with respect to the fan supporting portion 84. That is, the input portion and the actuator support portion 86 are disposed on opposite sides of the fan support portion 84.

An idle pulley 67 is pivotally supported near the rear end of the front / rear frame member 81 so as to be located away from the input pulley 60 and the output pulley 61 attached to the fan main shaft 71 so as to be integrally rotatable.
A mounting bracket 87 for the tension pulley 68 is provided at a position closer to the rear end of the front / rear frame member 81 than the idle pulley 67.
Further, a rising member 88 is provided on the rear end side of the front / rear frame member 81, and the switch sensor 110 is attached to an upper portion of the rising member 88. The switch sensor 110 includes a detection link 110 a that can swing up and down. An upper end portion of the linkage rod 103 is connected to a free end portion of the detection link 110 a, and a lower end portion of the linkage rod 103 is connected to the swing body 66.

As shown in FIGS. 8 and 9, the rocking body 66 includes a boss portion 66 </ b> A that fits around the fan main shaft 71 at the center. Then, on the outer peripheral surface side of the boss portion 66A, a first plate 66B that supports the inscribed ring body 64 and the circumscribed ring body 63 and can be connected to the coil spring 84a, and a second plate that can be connected to the wire 84b. The body 66C is fixed by welding.
Of the inscribed ring body 64 and the circumscribed ring body 63, the pivot shaft 64a of the inscribed ring body 64 is fixed to the first plate body 66B, but the pivot shaft 63a of the circumscribed ring body 63 is the first plate body. It is supported by the adjusting bolt 66Bb through a long hole 66Ba formed in 66B, and is configured to be position adjustable within the range of the long hole 66Ba.
A coil spring 84a is connected to the spring connection hole 66Bc formed in the first plate body 66B, and the lower end side of the linkage rod 103 is connected to the rod connection hole 66Bd.

  The wire 84b is connected to the wire connection hole 66Ca formed in the second plate body 66C. The wire 84b is guided by a curved guide portion 66Cb provided on the second plate body 66C, and is pulled or loosened in a state where the wire 84b is not bent with an extremely large curvature.

  A plate-like rear cover 74 is provided across the rear end portion of the upper arm 85A in the extending arm portion 85 and the rear end portion of the upper frame 13B of the tank support base 13. As shown in FIGS. 4 to 7, the rear cover 74 covers the rear and upper sides of the forward / reverse switching mechanism 6 and the radiator fan 70. The presence of the rear cover 74 can reduce the possibility of the forward / reverse switching mechanism 6 and the radiator fan 70 coming into contact with other objects.

[Retainer]
As shown in FIG. 5 to FIG. 7, a forward projecting piece 83 </ b> B is projected toward the front side at an intermediate position in the vertical direction of the extension column 83, and a retainer 89 is attached to the forward projecting piece 83 </ b> B. .
The retainer 89 is located on the outer peripheral upper surface side of the transmission belt 62 of the forward / reverse switching mechanism 6 and regulates belt detachment due to temporary loosening of the transmission belt 62 during the swing switching operation of the swing body 66. Is for.

The retainer 89 includes an attachment plate 89a and an L-shaped restriction rod 89b that is welded and fixed integrally with the attachment plate 89a. A rod portion along the horizontal direction of the restriction rod 89b extends along the outer peripheral surface of the transmission belt 62. It is provided in the state.
The mounting plate 89a has a pair of long holes 89c extending in the vertical direction, and is configured so that the fixing bolt 89d inserted through the long hole 89c can be loosened to adjust the position up and down.

[Other Embodiment 1]
In the above embodiment, the electric motor 100 is illustrated as an actuator for operating the forward / reverse switching mechanism 6, but is not limited to this structure.
For example, a hydraulic motor, an electric cylinder, a hydraulic cylinder, a pneumatic cylinder, an electromagnet, or the like may be used as the actuator.
Other configurations may be the same as those in the above-described embodiment.

[Second embodiment]
In the above-described embodiment, the forward / reverse switching mechanism 6 is exemplified by the structure using the transmission belt 62 and the inscribed ring body 64 or the circumscribed ring body 63, but is not limited to this structure.
For example, the rotational direction of the radiator fan 70 can be selected by selectively selecting the rotational direction by using a plurality of types of transmission belts of the forward transmission belt and the reverse transmission belt, or by rotating the transmission belt 62 itself forward and backward. May be changed.
Other configurations may be the same as those in the above-described embodiment.

[3 of another embodiment]
In the above embodiment, the forward / reverse switching of the radiator fan 70 by the forward / reverse switching mechanism 6 is configured to be switched forward / reverse at predetermined time intervals based on only the control program provided in the control device. However, the structure is not necessarily limited to this structure.
For example, the ratio of the forward drive time ratio and the reverse drive time ratio is artificially changed by a control dial provided in the operation unit, or the reverse rotation operation is forcibly performed during the forward drive by a forced on / off switch. Appropriate changes are possible.
Other configurations may be the same as those in the above-described embodiment.

[4 of another embodiment]
In the above embodiment, the cooling unit support frame 8 is exemplified as having a structure in which the lower end side is fixed to the body frame 1 and the upper end side is connected to the rear portion of the upper frame 13B of the tank support base 13. It is not limited.
For example, the body frame 1 so that the upper end side of the cooling part support frame 8 is connected to the body fixing part other than the upper frame 13B of the tank support base 13, or the cooling part support frame 8 can stand independently. It may be fixed to.
Moreover, the shape of the cooling unit support frame 8 is not limited to the combination structure of the single upright column 80 and the front and rear frame 81 as shown in the embodiment, and a plurality of upright columns 80 are used. Appropriate shapes and structures such as a structure and a plate or box formed as a whole can be adopted.
Other configurations may be the same as those in the above-described embodiment.

[5 of another embodiment]
In the above embodiment, the cooling unit support frame 8 has a structure in which the actuator support unit 86 is disposed on the opposite side of the fan support unit 84 from the input pulley 60 that is the input unit. However, the present invention is not limited to this structure.
For example, the actuator support portion 86 may have a structure in which the actuator support portion 86 is disposed on the same front side as the input pulley 60 that is the input portion with respect to the fan support portion 84.
Other configurations may be the same as those in the above-described embodiment.

[6 of another embodiment]
In the above embodiment, the cylindrical boss 84A that pivotally supports the fan main shaft 71 is welded and fixed in a state of partially entering from the rear side into the front-rear width of the upright support column 80, and the fan main shaft 71 is cooled by the cooling unit. Although the structure in which the support frame 8 is located in a position shifted in the front-rear direction with respect to the center of the width in the front-rear direction is shown, the present invention is not limited to this structure.
For example, the entire cylindrical boss 84 </ b> A is positioned within the front-rear width of the upright column 80, or the entire cylindrical boss 84 </ b> A is positioned outside the front-rear width of the upright column 80. It may be fixed. Further, the fan main shaft 71 does not necessarily exist at a position that is misaligned in the front-rear direction with respect to the center of the width in the front-rear direction of the cooling unit support frame 8, and the axis p1 of the fan main shaft 71 is supported by the cooling unit. It may be present at a position that matches the center of the front-rear width of the frame 8.
Other configurations may be the same as those in the above-described embodiment.

[7 of another embodiment]
In the above-described embodiment, the transmission mechanism to the forward / reverse switching mechanism 6 is exemplified by the belt transmission mechanism. However, the present invention is not limited to this structure. For example, not only the belt transmission mechanism but also a shaft transmission structure may be used.
Other configurations may be the same as those in the above-described embodiment.

[8 of another embodiment]
In the above-described embodiment, the traveling device 2 is configured such that the front wheel 2F is configured by a non-steering wheel and the rear wheel 2R is configured by a steering wheel. However, the present invention is not limited thereto, and for example, the front wheel 2F is steered. The rear wheel 2R may be a non-steering wheel. Moreover, you may comprise both the front wheel 2F and the rear wheel 2R with a steering wheel.
In addition, the traveling device 2 is not limited to one configured only with wheels, but for example, the front traveling unit is configured with a semi-crawler type crawler traveling device, and the rear traveling unit is configured with a rear wheel 2R composed of steered wheels. There may be. Conversely, the front traveling unit may be configured by a front wheel 2F made of steered wheels, and the rear traveling unit may be configured by a semi-crawler type crawler traveling device.
Other configurations may be the same as those in the above-described embodiment.

  The working machine shown in the present invention is not limited to a combine that harvests grains such as rice, wheat, and corn, but can also be applied to those that harvest beans such as soybeans and flower varieties such as rapeseed. Moreover, not only a normal type combine but a self-removal type combine may be sufficient.

DESCRIPTION OF SYMBOLS 1 Airframe frame 3 Engine 6 Forward / reverse switching mechanism 7 Radiator 8 Cooling part support frame 13 Working part frame 42 Transmission mechanism 60 Input pulley 61 Output pulley 62 Transmission belt 63 Outer ring body 64 Internal ring body 65 Forward / reverse transmission belt 66 Oscillator 70 Radiator fan 71 Fan main shaft 84 Fan support portion 86 Actuator support portion 100 Actuator 101 Swing operation body 102 Connecting member p1 Swing axis p2 Another shaft center

Claims (10)

Engine,
A radiator for cooling the engine;
And a radiator fan that is rotationally driven by the power of the engine,
A forward / reverse switching mechanism is provided in the power transmission system from the engine to the radiator fan,
The forward / reverse switching mechanism changes the rotation direction of the radiator fan disposed facing the radiator from the side opposite to the side where the radiator fan exists to the cooling fan side through the vent surface of the radiator. It is configured to be switchable between a normal rotation state to be drawn in and a reverse rotation state in which cooling air is blown from the radiator fan side to the ventilation surface side.
An actuator capable of switching between a normal rotation state and a reverse rotation state by the forward / reverse switching mechanism;
The working machine in which the radiator fan, the forward / reverse switching mechanism, and the actuator are supported by a cooling unit support frame located at a location away from the engine.   The cooling part support frame is provided with a fan support part that pivotally supports the fan main shaft of the radiator fan, and at a free end side portion of an extending arm part that is cantilevered from the fan support part. The work machine according to claim 1, further comprising an actuator support portion to which the actuator can be attached.   The actuator support portion is disposed on the opposite side of the fan support portion from the input portion of the forward / reverse switching mechanism to which power is transmitted from an output portion of the engine via a transmission mechanism. 2. The working machine according to 2. The forward / reverse switching mechanism includes an input pulley as an input portion to which power is transmitted from an output portion of the engine via a transmission mechanism, an output pulley provided on the fan main shaft, an output pulley thereof, and the input pulley. With a transmission belt wound around,
The work machine according to claim 2 or 3, wherein the output pulley and the input pulley are attached to the cooling unit support frame. The forward / reverse switching mechanism includes a circumscribed ring body that can abut on the outer peripheral side of the transmission belt, an inscribed ring body that can abut on the inner peripheral side of the transmission belt, and the circumscribed ring body and the inscribed ring. A forward and reverse transmission belt wound around a body and the output pulley, and a rocking body that supports the circumscribed ring body and the inscribed ring body,
The work machine according to claim 4, wherein the swinging body is pivotally supported so as to be swingable about the same swing axis as the axis of the fan main shaft.   The actuator includes a rocking operation body that is rocked around another axis in a direction along the rocking axis of the rocking body, and a connecting member that connects the rocking operation body and the rocking body is provided. 6. The work machine according to claim 5, wherein the work implement is distributed and arranged on both sides of an imaginary line segment connecting the swing axis of the swing body and the another axis. The radiator fan is disposed at a higher position on the rear side than the engine,
The input part of the forward / reverse switching mechanism is arranged on the upper front side of the radiator fan,
The work machine according to any one of claims 1 to 6, wherein the actuator is disposed at a lower rear side than the radiator fan. A working part frame for supporting a working part arranged at a position higher than the radiator fan is erected on the body frame,
The work implement according to claim 1, wherein a lower end side of the cooling unit support frame is supported by the machine body frame, and an upper end side is coupled to the working unit frame.   The work machine according to any one of claims 1 to 8, wherein the cooling unit support frame is erected from the machine body frame at a rear part of the machine body.   The work machine according to any one of claims 1 to 9, wherein a fan main shaft of the radiator fan is attached to a position that is misaligned in a front-rear direction with respect to a center of a width in a front-rear direction of the cooling unit support frame.

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