JP2020089272A - Combine-harvester - Google Patents

Abstract

To reliably transmit driving force to a cooling fan during normal rotation and reverse rotation of the fan.SOLUTION: A combine-harvester comprises an input pulley 54, a first pulley 51, a second pulley 52, a first belt 71, a fan drive pulley 65 and a second belt 72. The driving force of an engine is input in the input pulley 54. The first pulley 51 rotates in the same direction as the input pulley 54, and the second pulley 52 rotates in a reverse direction. The first belt 71 is wound around the input pulley 54, the first pulley 51 and the second pulley 52. The fan drive pulley 65 transmits the driving force to a cooling fan 31. The second belt 72 transmits the driving force of the first pulley 51 or the driving force of the second pulley 52 to the fan drive pulley 65. When a surface of the second belt 72 is divided into a face inside an orbit and a face outside the orbit, either the driving force of the first pulley 51 or the driving force of the second pulley 52 can be selectively transmitted to faces of the second belt 72 on the same side.SELECTED DRAWING: Figure 3

Description

The present invention relates to a combine.

Conventionally, a configuration for cooling a combine engine is known. Patent Document 1 discloses an engine cooling device having such a configuration. The engine cooling device of Patent Document 1 includes a radiator and a fan for the radiator. The engine cooling device of Patent Document 1 is configured to be able to suck the outside air through the dust removal portion provided on the side surface portion of the combine by the normal rotation of the fan for the radiator.

When the combine harvests, a large amount of dust is often scattered around. In such a situation, a large amount of dust is collected by the dust removing unit in a short time as the outside air is sucked by the normal rotation of the fan. When the amount of dust adhering to the dust removing portion increases, the amount of cooling air decreases, and as a result, the cooling performance of the engine deteriorates. Therefore, in Patent Document 1, the state of the radiator fan is switched from a normal rotation state in which the fan rotates normally to a reverse rotation state in which the fan rotates in the reverse direction to generate an air flow in a direction opposite to the intake direction of the outside air. The dust attached to the dust removing portion can be blown off and removed by the force of the wind.

Specifically, the engine cooling device of Patent Document 1 includes a radiator, a fan for the radiator, a driving unit, and a control unit. The drive means can switch the fan for the radiator between the normal rotation state and the reverse rotation state to drive the fan. The control means can control the operation of the drive means so that the radiator fan is intermittently switched between the normal rotation state and the reverse rotation state.

Further, the engine cooling device of Patent Document 1 includes an input pulley of a radiator fan, an output pulley of the engine, a transmission belt, and a switching member. The transmission belt is wound around the input pulley and the output pulley. The switching member is provided with a forward rotation pulley and a reverse rotation pulley. Then, the engine cooling device of Patent Document 1 uses a switching member to switch between a normal rotation state and a reverse rotation state of a fan for a radiator by pressing a forward rotation pulley or a reverse rotation pulley against a transmission belt. Has become.

JP, 11-036862, A

In the configuration of Patent Document 1, the forward rotation pulley and the reverse rotation pulley rotate in the same direction as the input pulley and the output pulley with respect to the transmission belt. Due to this, depending on whether the forward rotation pulley is pressed against one surface (inner surface) of the transmission belt or the reverse rotation pulley is pressed against the other surface (outer surface) of the transmission belt, a fan for a radiator is selected. The normal rotation state and the reverse rotation state are switched. Therefore, in Patent Literature 1, one of the forward rotation pulley and the reverse rotation pulley must press the back surface of the transmission belt. However, when the pulley is pressed against the back surface of the transmission belt, it becomes difficult for the driving force of the transmission belt to be transmitted to the forward rotation pulley or the reverse rotation pulley, and the rotational force of the fan becomes weak.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a combine capable of reliably transmitting a driving force to the cooling fan during forward rotation and reverse rotation of the cooling fan. ..

Means and effects for solving the problems

The problem to be solved by the present invention is as described above. Next, means for solving the problem and its effect will be described.

According to a first aspect of the present invention, there is provided a combine having the following configuration. That is, this combine includes an engine room in which an engine is installed, and a cooling fan that sucks outside air into the engine room through a dust removing unit. The combine includes an input pulley, a first pulley, a second pulley, a first belt, a fan drive pulley, and a second belt. The driving force of the engine is input to the input pulley. The first pulley rotates in the same direction as the input pulley. The second pulley rotates in the opposite direction to the input pulley. The first belt is wound around the input pulley, the first pulley, and the second pulley. The fan drive pulley transmits a driving force to the cooling fan. The second belt transmits the driving force of the first pulley or the driving force of the second pulley to the fan driving pulley. When the surface of the second belt is divided into a surface on the inner side of the raceway and a surface on the outer side of the raceway, the driving force of the first pulley and the driving force of the second pulley with respect to the surface on the same side of the second belt. One of the driving forces can be selectively transmitted.

As a result, regardless of whether the rotation direction of the cooling fan is forward or reverse, when the surface of the second belt is considered separately from the inside/outside of the track, the input of the engine is The driving force of the pulley is transmitted. Therefore, the driving force can be similarly transmitted to the cooling fan during the normal rotation and the reverse rotation of the cooling fan. As a result, it is possible to favorably prevent a difference in reliability of drive transmission depending on the rotation direction of the cooling fan.

According to a second aspect of the present invention, there is provided a combine having the following configuration. That is, this combine includes an engine room in which an engine is installed, and a cooling fan that sucks outside air into the engine room through a dust removing unit. The combine includes an input pulley, a first pulley, a second pulley, a first belt, a fan driving pulley, a first transmission belt, a second transmission belt, and a tension pulley. The driving force of the engine is input to the input pulley. The first pulley rotates in the same direction as the input pulley. The second pulley rotates in the opposite direction to the input pulley. The first belt is wound around the input pulley, the first pulley, and the second pulley. The fan drive pulley transmits a driving force to the cooling fan. The first transmission belt is provided so that the driving force of the first pulley can be transmitted to the fan driving pulley. The second transmission belt is provided so that the driving force of the second pulley can be transmitted to the fan driving pulley. The tension pulley is provided so as to be in contact with the first transmission belt or the second transmission belt. When the tension pulley comes into contact with the first transmission belt or the second transmission belt, the driving force of the first pulley or the second pulley is transmitted to the fan drive pulley. When the surface of the first transmission belt is divided into a surface on the inner side of the raceway and the surface on the outer side of the raceway, and the surface of the second transmission belt is divided into a surface on the inner side of the raceway and a surface on the outer side of the raceway, the tension pulley is The surfaces of the first transmission belt and the second transmission belt on the same side can be selectively contacted.

As a result, regardless of whether the rotation direction of the cooling fan is forward or reverse, when the surfaces of the first transmission belt and the second transmission belt are considered separately from the inside/outside of the track, The tension pulley contacts the surface. Therefore, the driving force can be similarly transmitted to the fan drive pulley during the normal rotation and the reverse rotation of the cooling fan. As a result, it is possible to favorably prevent a difference in reliability of drive transmission depending on the rotation direction of the cooling fan.

The above combine preferably has the following configuration. That is, the combine includes the first interlocking pulley and the second interlocking pulley. The first interlocking pulley rotates in conjunction with the first pulley. The second interlocking pulley rotates in conjunction with the second pulley. The rotation direction of the cooling fan is switched by switching between transmitting the driving force of the first interlocking pulley and transmitting the driving force of the second interlocking pulley to the fan drive pulley.

With this, the driving force can be reliably transmitted to the cooling fan with a simple configuration regardless of whether the cooling fan is rotating normally or reversely.

The above combine preferably has the following configuration. That is, when the input pulley is rotating, the driving force of the input pulley is always transmitted to the first pulley and the second pulley.

As a result, the first belt is always tensioned, so that the driving force can be more reliably transmitted to each of the first pulley and the second pulley.

The side view of the combine of 1st Embodiment of this invention. FIG. 4 is a front cross-sectional view showing the configuration near the lower portion of the combine driving section. FIG. 4 is a side view showing a case where the cooling fan is in the normal rotation state in the switching mechanism that switches the rotation direction of the cooling fan. The side view which shows the case where a cooling fan is a reverse rotation state. The schematic diagram which shows the switching mechanism in case the cooling fan is a normal rotation state in the switching mechanism of 2nd Embodiment. The schematic diagram which shows the case where a cooling fan is a reverse rotation state.

Next, an embodiment of the present invention will be described with reference to the drawings. First, the combine 1 of the first embodiment of the present invention will be described. FIG. 1 is a side view of the combine 1. FIG. 2 is a front cross-sectional view showing the configuration near the lower portion of the operating unit 13 of the combine 1.

In the following description, the term "front" means the direction in which the combine 1 advances during mowing. In the following description, the terms "left" and "right" mean left and right in the direction in which the combine 1 moves forward.

As shown in FIG. 1 and the like, the combine 1 includes a crawler unit 3, a mowing unit 5, a threshing unit 7, a sorting unit 9, a Glen tank 11, a discharge auger 12, an operating unit 13, and an engine 23. , Is provided.

The crawler unit 3 is provided below the combine 1. The crawler unit 3 is configured as a traveling device including an endless crawler.

The reaper 5 is provided at the front of the combine 1. The reaper 5 can reaper the root of a grain culm of a crop such as rice, wheat or soybean.

The threshing unit 7 is provided on the left side of the combine 1. The threshing unit 7 is arranged behind the mowing unit 5. The threshing unit 7 threshes the grain culms cut by the cutting unit 5.

The selection unit 9 is provided on the left side of the combine 1. The sorting unit 9 is arranged below the threshing unit 7. The selection unit 9 selects and takes out the grains that have been threshed by the threshing unit 7.

The Glen tank 11 is provided on the right rear side of the combine 1. The Glen tank 11 is arranged on the right side of the sorting unit 9. The grain tank 11 stores the grains selected by the selection unit 9.

The discharge auger 12 is connected to the lower side of the rear portion of the Glen tank 11. The discharge auger 12 can discharge the grain stored in the grain tank 11 to the outside of the grain tank 11.

The driving unit 13 is provided on the right front side of the combine 1. The operating unit 13 is arranged between the harvesting unit 5 and the Glen tank 11. The driving unit 13 is configured with a living space for an operator who drives the combine 1.

A driver's seat 14 on which an operator sits is arranged in the driver 13. Further, the driving unit 13 includes an operation member (for example, a steering wheel 15) for an operator to instruct.

The engine 23 is installed in an engine room 21 formed in the combine 1 as shown in FIG. The engine room 21 is arranged below the operating unit 13. The position of the engine room is not limited to below the operating unit 13, and may be behind the operating unit 13 or the Glen tank 11, or in front of the operating unit 13.

The engine 23 includes an output shaft 25. The output shaft 25 is arranged in the left-right direction of the combine 1. The output shaft 25 is connected to the crawler unit 3, the threshing unit 7, the sorting unit 9 and the like in FIG. 1 via an appropriate transmission mechanism. A flywheel (not shown) is fixed to the output shaft 25.

An unillustrated threshing clutch is provided in the transmission mechanism that connects the output shaft 25 of the engine 23 and the threshing unit 7. The threshing clutch can switch transmission/interruption of power from the engine 23 to the threshing unit 7.

As shown in FIG. 2, a radiator 27 and a cooling fan 31 used for cooling the engine 23 are attached to the engine 23. The cooling fan 31 is arranged between the engine 23 and the radiator 27.

The cooling fan 31 generates a flow of air by rotating, allows the air to pass through the radiator 27, and blows air on the engine 23 to cool the engine 23. The power of the output shaft 25 of the engine 23 is transmitted to the cooling fan 31 to rotate.

An opening is formed on the right side surface of the combine 1. This opening is connected to the internal space of the engine room 21. A dust removing portion 33 is provided so as to cover this opening. The radiator 27 and the cooling fan 31 are arranged so as to face the dust removing portion 33.

As will be described later in detail, the engine 23 is provided with a switching mechanism 50 for switching the rotation direction of the cooling fan 31. In the following description, the rotation of the cooling fan 31 in the direction of sucking the air outside the combine 1 into the engine room 21 may be referred to as normal rotation. Further, the rotation of the cooling fan 31 in the direction of discharging the air in the engine room 21 to the outside of the combine 1 may be referred to as reverse rotation.

The dust removing portion 33 is made of a mesh member. The dust removing unit 33 receives dust when the cooling fan 31 is normally rotated and the outside air is sucked into the engine room 21. As a result, the outside air can be separated from the dust, and clean air can be supplied into the engine room 21 for cooling.

The dust collected in the dust removing unit 33 is blown away from the dust removing unit 33 by the reverse rotation of the cooling fan 31, and is removed. Thereby, clogging of the dust removing portion 33 can be prevented.

Next, the switching mechanism 50 will be described in detail. FIG. 3 is a side view showing the switching mechanism 50 when the cooling fan 31 is in the normal rotation state. FIG. 4 is a side view showing the switching mechanism 50 when the cooling fan 31 is in the reverse rotation state.

As shown in FIG. 3, the switching mechanism 50 includes an input pulley 54, a first pulley 51, a second pulley 52, a first tension pulley 53, a first belt 71, a switching arm 80, and a first interlocking mechanism. A pulley 61, a second interlocking pulley 62, a driven pulley 63, a second tension pulley 64, a fan drive pulley 65, a second belt 72, a support plate 90, and a position changing device 100 are provided.

The switching mechanism 50 is provided on the same surface of the engine 23 as the side on which the cooling fan 31 is arranged. The switching mechanism 50 is arranged between the end of the output shaft 25 of the engine 23 and the drive shaft 68 of the cooling fan 31. The drive shaft 68 of the cooling fan 31 is located above the output shaft 25 of the engine 23 and arranged in parallel with the output shaft 25.

In FIG. 3 and FIG. 4, the cooling fan 31, the switching arm 80, the support plate 90, and the like are transparently drawn with a chain line in consideration of viewability of the drawings.

The driving force of the engine 23 is input to the input pulley 54. The input pulley 54 is attached to the output shaft 25 located under the engine 23 such that it cannot rotate relative to the output shaft 25. The input pulley 54 rotates integrally with the output shaft 25. However, the input pulley 54 may be anything that rotates in conjunction with the output shaft 25 of the engine 23.

The first pulley 51 is arranged above the input pulley 54. The first pulley 51 is rotatably supported by the switching arm 80. Specifically, the first rotating shaft 81 to which the first pulley 51 is fixed is rotatably supported by the switching arm 80.

The second pulley 52 is arranged above the input pulley 54 and close to the first pulley 51. The second pulley 52 is rotatably supported by the switching arm 80. Specifically, the second rotating shaft 82 to which the second pulley 52 is fixed is rotatably supported by the switching arm 80.

The first tension pulley 53 is arranged on the opposite side of the first pulley 51 with the second pulley 52 interposed therebetween when viewed in the direction along the output shaft 25. A first tension arm 83 is rotatably supported by the switching arm 80, and the first tension pulley 53 is rotatably supported by the tip of the first tension arm 83. The rotation axis of the first tension arm 83 coincides with the second rotation axis 82 (in other words, the rotation axis of the second pulley 52).

The first belt 71 is formed in an endless shape and is wound around the input pulley 54, the first pulley 51, the second pulley 52, and the first tension pulley 53. The input pulley 54, the first pulley 51, and the first tension pulley 53 are arranged inside the loop-shaped track of the first belt 71. The second pulley 52 is arranged outside the track of the first belt 71. The first belt 71 is wound around the first pulley 51 and the second pulley 52 in an S shape.

The driving force of the input pulley 54 is transmitted by the first belt 71, so that the first pulley 51 rotates in the same direction as the input pulley 54 (direction D1). At the same time, the second pulley 52 rotates in the direction opposite to the input pulley 54 (direction D2).

A first biasing spring 85 is attached between the first tension arm 83 and the switching arm 80. The first biasing spring 85 biases the first tension pulley 53 via the first tension arm 83 so as to push the endless first belt 71 outward. This makes it possible to apply an appropriate tension to the first belt 71.

The switching arm 80 is provided so that the first pulley 51, the second pulley 52, and the first tension pulley 53 can be displaced with respect to the input pulley 54 (the output shaft 25 of the engine 23). The switching arm 80 is configured as a plate-shaped member, and is arranged on the side of the engine 23 where the input pulley 54 is provided. The input pulley 54, the first pulley 51, and the second pulley 52 are arranged on the switching arm 80 so as to form a triangular vertex. The switching arm 80 is rotatably supported around the output shaft 25.

The first interlocking pulley 61 is arranged side by side in the axial direction of the first rotating shaft 81 with respect to the first pulley 51. The first interlocking pulley 61 is arranged on the opposite side of the first pulley 51 with the switching arm 80 interposed therebetween. The first interlocking pulley 61 is attached to the first rotating shaft 81 so as not to be relatively rotatable. With the rotation of the first pulley 51, the first interlocking pulley 61 rotates integrally with the first pulley 51.

The second interlocking pulley 62 is arranged side by side in the axial direction of the second rotating shaft 82 with respect to the second pulley 52. The second interlocking pulley 62 is arranged on the opposite side of the second pulley 52 with the switching arm 80 interposed therebetween. The second interlocking pulley 62 is attached to the second rotating shaft 82 so as not to rotate relative to it. With the rotation of the second pulley 52, the second interlocking pulley 62 rotates integrally with the second pulley 52.

The driven pulley 63 is arranged at a position lower than the first interlocking pulley 61 and the second interlocking pulley 62. The driven pulley 63 is rotatably supported by the support plate 90.

The second tension pulley 64 is arranged at a position lower than the first interlocking pulley 61 and the second interlocking pulley 62. The second tension arm 94 is rotatably supported by the support plate 90, and the second tension pulley 64 is rotatably supported by the tip of the second tension arm 94.

The fan drive pulley 65 is provided so that the driving force can be transmitted to the cooling fan 31. The fan drive pulley 65 is attached to the drive shaft 68 of the cooling fan 31 so as not to rotate relative to it. The drive force of the first pulley 51 or the drive force of the second pulley 52 can be selectively transmitted to the fan drive pulley 65.

The cooling fan 31 rotates integrally with the fan drive pulley 65. However, the cooling fan 31 may rotate in conjunction with the fan drive pulley 65.

The second belt 72 is formed in an endless shape and wound around the fan drive pulley 65, the driven pulley 63, and the second tension pulley 64. The fan drive pulley 65, the driven pulley 63, and the second tension pulley 64 are arranged inside the loop-shaped track of the second belt 72. Similarly, the first interlocking pulley 61 and the second interlocking pulley 62 are also arranged inside the track of the second belt 72. By displacing the switching arm 80, one of the first interlocking pulley 61 and the second interlocking pulley 62 can selectively contact the second belt 72.

A second biasing spring 96 is attached between the second tension arm 94 and the support plate 90. The second biasing spring 96 biases the second tension pulley 64 via the second tension arm 94 so as to push the endless second belt 72 outward. This makes it possible to apply an appropriate tension to the second belt 72.

The support plate 90 rotatably supports the driven pulley 63, the fan drive pulley 65, the cooling fan 31, and the like. The support plate 90 is made of a plate-shaped member. The support plate 90 is arranged substantially parallel to the switching arm 80. The fan drive pulley 65, the driven pulley 63, and the second tension pulley 64 are arranged so as to form a triangle.

In the switching mechanism 50, it is possible to switch which of the first interlocking pulley 61 and the second interlocking pulley 62 comes into contact with the second belt 72. Accordingly, a state in which the driving force of the first pulley 51 is transmitted to the fan driving pulley 65 (a normal rotation state of the cooling fan 31) and a state in which the driving force of the second pulley 52 is transmitted to the fan driving pulley 65 (cooling) The reverse rotation state of the fan 31) is switched.

Specifically, when the switching arm 80 rotates about the output shaft 25 of the engine 23, the first interlocking pulley 61 and the second interlocking pulley 62 are displaced with respect to the second belt 72, and the first interlocking pulley 61 and the second interlocking pulley 61 and the second interlocking pulley 61. Only one of the interlocking pulleys 62 is configured to come into contact with the second belt 72. FIG. 3 shows a state in which the first interlocking pulley 61 is in contact with the second belt 72, and FIG. 4 shows a state in which the second interlocking pulley 62 is in contact with the second belt 72.

In this embodiment, the position changing device 100 is used to rotate the switching arm 80. The position changing device 100 includes a motor 101 as an actuator, a worm gear 102, a first spring member 103, and a second spring member 104.

The motor 101 is fixed to an appropriate location of the combine 1. The motor 101 is connected to the switching arm 80 via the worm gear 102 and the first spring member 103. By driving the motor 101, the first spring member 103 can be pushed or pulled. The second spring member 104 biases the switching arm 80 to one side. The first spring member 103 can pull the switching arm 80 in a direction that resists the second spring member 104 from biasing the switching arm 80.

When the motor 101 pushes the first spring member 103, the switching arm 80 is pulled by the second spring member 104, and rotates about the output shaft 25 of the engine 23 in the clockwise direction in FIG. 3. Thus, as shown in FIG. 3, the first interlocking pulley 61 comes into contact with the second belt 72 stretched between the fan driving pulley 65 and the driven pulley 63. In this state, the second interlocking pulley 62 is not in contact with the second belt 72.

In the state of FIG. 3, the first spring member 103 has a substantially natural length. The contact pressure between the first interlocking pulley 61 and the second belt 72 is realized by the spring force of the second spring member 104.

With the rotation of the input pulley 54, the first interlocking pulley 61 always rotates in the D1 direction, and the second interlocking pulley 62 always rotates in the D2 direction. In the state of FIG. 3, the rotation of the first interlocking pulley 61 is transmitted to the fan drive pulley 65 via the second belt 72, and the cooling fan 31 rotates in the normal direction.

When the motor 101 is driven from the state of FIG. 3 to pull the first spring member 103, the first spring member 103 pulls the switching arm 80, and the force thereof gradually increases. When the motor 101 pulls the first spring member 103 by a sufficient distance, the switching arm 80 pulled by the first spring member 103 resists the urging force of the second spring member 104 to center the output shaft 25 of the engine 23. As a result, it rotates counterclockwise in FIG. Thus, as shown in FIG. 4, the second interlocking pulley 62 comes into contact with the second belt 72 stretched between the fan drive pulley 65 and the second tension pulley 64. In this state, the first interlocking pulley 61 is not in contact with the second belt 72.

In the state of FIG. 4, the contact pressure between the second interlocking pulley 62 and the second belt 72 is due to the remaining spring force that substantially cancels the spring force of the first spring member 103 from the spring force of the first spring member 103. Will be realized.

With the rotation of the input pulley 54, the first interlocking pulley 61 always rotates in the D1 direction, and the second interlocking pulley 62 always rotates in the D2 direction. In the state of FIG. 4, the rotation of the second interlocking pulley 62 is transmitted to the fan drive pulley 65 via the second belt 72, and the cooling fan 31 rotates in the reverse direction.

When the switching arm 80 rotates to switch between the state of FIG. 3 and the state of FIG. 4, the first pulley 51, the second pulley 52, and the first tension pulley 53 have an arc shape centered on the rotation axis of the input pulley 54. Draw the locus of and move. Even while the switching arm 80 is rotating, the distance between the first pulley 51, the second pulley 52 and the like and the center of the input pulley 54 is kept constant, so the first belt 51 and the second pulley 52 by the first belt 71. The driving force is transmitted to the vehicle without any trouble.

Along with the rotation of the switching arm 80, a timing occurs in which the second belt 72 is not in contact with either the first interlocking pulley 61 or the second interlocking pulley 62. At this timing, neither the rotation of the first interlocking pulley 61 nor the rotation of the second interlocking pulley 62 is transmitted to the fan drive pulley 65, so that the rotational speed of the cooling fan 31 decreases. Therefore, it is possible to prevent the normal rotation and the reverse rotation of the cooling fan 31 from being rapidly switched. As a result, it is possible to prevent generation of abnormal noise when the first interlocking pulley 61 or the second interlocking pulley 62 comes into contact with the second belt 72.

In addition, the position changing device 100 is not limited to the above-described configuration, and selectively displaces the first pulley 51 (first interlocking pulley 61) and the second pulley 52 (second interlocking pulley 62) to a predetermined position. Anything can be done.

In the present embodiment, the second belt 72 is configured as a V belt. Further, the first interlocking pulley 61, the second interlocking pulley 62, the driven pulley 63, the second tension pulley 64, and the fan drive pulley 65 are all configured as V pulleys. The tapered surface of the V-belt can be considered to be the surface on the inner side of the track of the second belt 72, and the outer peripheral surface can be considered to be the surface on the outer side of the track.

In the normal rotation state shown in FIG. 3, the first interlocking pulley 61 is in contact with the inner surface of the second belt 72. In the reverse rotation state shown in FIG. 4, the second interlocking pulley 62 is in contact with the inner surface of the second belt 72. In this way, considering the inner surface of the belt and the outer surface of the belt, of the driving force of the first pulley 51 and the driving force of the second pulley 52 with respect to the surface on the same side of the second belt 72. Either of them is selectively transmitted, and the second belt 72 is frictionally driven.

Therefore, the power of the input pulley 54 can be similarly transmitted to the second belt 72 in both forward rotation and reverse rotation. As a result, stable power transmission can be realized regardless of the rotation direction of the cooling fan 31.

The first interlocking pulley 61 is connected to the first pulley 51 via a first rotation shaft 81 so as not to rotate relative to each other. Similarly, the second interlocking pulley 62 is connected to the second pulley 52 via the second rotating shaft 82 so as not to rotate relative to each other. As a result, the rotation direction of the cooling fan 31 can be switched with a simple and compact structure.

The switching of the switching mechanism 50 (the switching of the position of the switching arm 80 by the position changing device 100) can be performed manually or automatically. The cooling fan 31 normally rotates normally, but in the case of manual operation, when the operator operates an appropriate operating member (for example, a switch) arranged in the operation unit 13, the cooling fan 31 is configured to reversely rotate. You can In the case of automatic operation, for example, the normal rotation of the cooling fan 31 for 120 seconds and the reverse rotation for 30 seconds can be alternately repeated. These controls can be realized by an unillustrated computer (control device) that controls the combine 1.

In the automatic case, the switching of the rotation direction of the cooling fan 31 by the switching mechanism 50 can be performed only when the combine 1 satisfies a predetermined condition. For example, when the threshing clutch is cutting off power, the cooling fan 31 continues to rotate normally, and only when the threshing clutch is transmitting power, the cooling fan 31 is switched between normal rotation and reverse rotation. A control executed every time is conceivable. As a result, it is possible to prevent clogging of the dust removing unit 33 during threshing, where dust is particularly likely to occur, while placing importance on cooling the engine 23 during normal times. The state of the threshing clutch can be detected by a known appropriate sensor.

As described above, the combine 1 of the present embodiment includes the engine room 21 in which the engine 23 is installed, and the cooling fan 31 that sucks the outside air into the engine room 21 through the dust removing portion 33. The combine 1 includes an input pulley 54, a first pulley 51, a second pulley 52, a first belt 71, a fan drive pulley 65, and a second belt 72. The driving force of the engine 23 is input to the input pulley 54. The first pulley 51 rotates in the same direction as the input pulley 54. The second pulley 52 rotates in the opposite direction to the input pulley 54. The first belt 71 is wound around the input pulley 54, the first pulley 51, and the second pulley 52. The fan drive pulley 65 transmits the driving force to the cooling fan 31. The second belt 72 transmits the driving force of the first pulley 51 or the driving force of the second pulley 52 to the fan driving pulley 65. When the surface of the second belt 72 is divided into a surface on the inner side of the raceway and a surface on the outer side of the raceway, a surface on the same side of the second belt 72 (specifically, a tapered surface of the V-belt which is a surface on the inner side of the raceway). On the other hand, one of the driving force of the first pulley 51 and the driving force of the second pulley 52 can be selectively transmitted.

As a result, whether the rotation direction of the cooling fan 31 is normal rotation or reverse rotation, when the surface of the second belt 72 is considered separately from the viewpoint of inside/outside of the track, the surface on the same side is The driving force of the input pulley 54 of 23 is transmitted. Therefore, the driving force can be similarly transmitted to the cooling fan 31 during the normal rotation and the reverse rotation of the cooling fan 31. As a result, it is possible to favorably prevent a difference in reliability of drive transmission depending on the rotation direction of the cooling fan 31.

Further, the combine 1 of the present embodiment includes a first interlocking pulley 61 and a second interlocking pulley 62. The first interlocking pulley 61 rotates in conjunction with the first pulley 51. The second interlocking pulley 62 rotates in conjunction with the second pulley 52. The rotation direction of the cooling fan 31 is switched by switching between transmitting the driving force of the first interlocking pulley 61 and transmitting the driving force of the second interlocking pulley 62 to the second belt 72.

Thus, with a simple configuration, the power can be reliably transmitted to the cooling fan 31 regardless of whether the cooling fan 31 rotates normally or reversely.

Further, in the combine 1 of the present embodiment, when the input pulley 54 is rotating, the driving force of the input pulley 54 is always transmitted to the first pulley 51 and the second pulley 52.

As a result, since the first belt 71 is always tensioned, the first pulley 51 and the second pulley 52 are respectively provided on different surfaces (tapered surface and outer peripheral surface of the V belt) of the first belt 71 as in the present embodiment. Even when they are in contact with each other, the driving force of the input pulley 54 can be more reliably transmitted to each of the first pulley 51 and the second pulley 52.

Next, a second embodiment will be described. FIG. 5 is a schematic diagram showing the switching mechanism 150 when the cooling fan 31 is in the normal rotation state. FIG. 6 is a schematic diagram showing the switching mechanism 150 when the cooling fan 31 is in the reverse rotation state. In addition, in the description of the present embodiment, the same or similar members as those in the above-described embodiment may be denoted by the same reference numerals in the drawings, and description thereof may be omitted.

As shown in FIGS. 5 and 6, the switching mechanism 150 of the present embodiment includes an input pulley 54, a first pulley 51, a second pulley 52, a first belt 71, a first interlocking pulley 61, and a first pulley 51. 2 interlocking pulley 62, forward rotation belt (first transmission belt) 72a, reverse rotation belt (second transmission belt) 72b, forward rotation tension pulley 64a, reverse rotation tension pulley 64b, switching arm 80x, intermediate An input pulley 97, an intermediate output pulley 98, an intermediate belt 73, and a fan drive pulley 65 are provided.

In the present embodiment, the first pulley 51, the second pulley 52, the first tension pulley 53, the first interlocking pulley 61, and the second interlocking pulley 62 are arranged slightly apart from the input pulley 54 in the horizontal direction.

The switching mechanism 150 of this embodiment does not include the switching arm 80 described in the first embodiment. Therefore, the first pulley 51, the second pulley 52, the first tension pulley 53, the first interlocking pulley 61, and the second interlocking pulley 62 do not move in position for switching the rotation direction of the cooling fan 31.

Although the first tension arm 83 and the first biasing spring 85 are not shown in FIG. 5, the first tension pulley 53 has the same configuration as that of the above-described first embodiment, and an appropriate tension is applied to the first belt 71. Granted.

The intermediate input pulley 97 is arranged above the first interlocking pulley 61 and the second interlocking pulley 62. The intermediate input pulley 97 is configured as a double pulley having two belt grooves. The intermediate input pulley 97 is fixed to a third rotating shaft 99 which is rotatably supported at an appropriate place.

The forward rotation belt 72a is wound around the first interlocking pulley 61 and the intermediate input pulley 97.

The reverse rotation belt 72b is wound around the second interlocking pulley 62 and the intermediate input pulley 97.

The forward rotation belt 72a and the reverse rotation belt 72b each have an elongated track in the vertical direction.

The intermediate output pulley 98 is arranged side by side in the axial direction with respect to the intermediate input pulley 97. The intermediate output pulley 98 is attached to the third rotating shaft 99 so as not to rotate relative to it. As the intermediate input pulley 97 rotates, the intermediate output pulley 98 rotates integrally with the intermediate input pulley 97.

The intermediate belt 73 is wound around the intermediate output pulley 98 and the fan drive pulley 65.

The switching arm 80x is supported at an appropriate place on the combine 1 so as to be slidable in a substantially horizontal direction. A forward rotation tension pulley 64a and a reverse rotation tension pulley 64b are rotatably supported by the switching arm 80x. The forward rotation tension pulley 64a and the reverse rotation tension pulley 64b are arranged side by side at substantially appropriate intervals in the horizontal direction so as to sandwich the tracks of the forward rotation belt 72a and the reverse rotation belt 72b which are elongated in the vertical direction.

The forward rotation tension pulley 64a is provided so as to be able to contact the forward rotation belt 72a. The forward rotation tension pulley 64a is arranged outside the track of the forward rotation belt 72a. As will be described in detail later, each of the two tension pulleys 64a and 64b constitutes a belt tension clutch that switches between transmission and interruption of power.

The reverse rotation tension pulley 64b is provided so as to be able to contact the reverse rotation belt 72b. The reverse rotation tension pulley 64b is arranged outside the track of the reverse rotation belt 72b.

With this configuration, FIG. 5 shows a state in which the motor 101 of the position changing device 100 hardly pulls the first spring member 103. Since the switching arm 80x is pulled by the second spring member 104, the switching arm 80x moves to one side in the longitudinal direction of the switching arm 80x as shown in FIG. As a result, the forward rotation tension pulley 64a comes into contact with the forward rotation belt 72a, and tension is applied to the forward rotation belt 72a. At this time, since the reverse rotation tension pulley 64b is not in contact with the reverse rotation belt 72b, no tension is applied to the reverse rotation belt 72b. The rotation of the first pulley 51 in the D1 direction is transmitted to the intermediate input pulley 97 via the first interlocking pulley 61 and the normal rotation belt 72a. As a result, the intermediate output pulley 98 rotates in the direction in which the cooling fan 31 is normally rotated.

FIG. 6 shows a state in which the motor 101 of the position changing device 100 pulls the first spring member 103 sufficiently. The switching arm 80x is pulled by the first spring member 103 and moves to the side opposite to that in FIG. As a result, the reverse rotation tension pulley 64b contacts the reverse rotation belt 72b, and tension is applied to the reverse rotation belt 72b. At this time, since the forward rotation tension pulley 64a is not in contact with the forward rotation belt 72a, no tension is applied to the forward rotation belt 72a. The rotation of the second pulley 52 in the D2 direction is transmitted to the intermediate input pulley 97 via the second interlocking pulley 62 and the reverse rotation belt 72b. As a result, the intermediate output pulley 98 rotates in the direction to reverse the cooling fan 31.

The forward rotation belt 72a and the reverse rotation belt 72b are both configured as V belts. Therefore, the surface of each of the forward rotation belt 72a and the reverse rotation belt 72b can be divided into a raceway inner surface and a raceway outer surface, as in the second belt 72 of the first embodiment. In the normal rotation state shown in FIG. 5, the normal rotation tension pulley 64a is in contact with the outer surface of the normal rotation belt 72a outside the raceway. In the reverse rotation state shown in FIG. 6, the reverse rotation tension pulley 64b is in contact with the outer surface of the reverse rotation belt 72b. In this way, the tension pulleys 64a and 64b selectively contact the surface of the forward rotation belt 72a or the reverse rotation belt 72b on the same side when considered inside/outside of the track.

The switching mechanism 150 is not limited to this. For example, the forward rotation tension pulley 64a may be arranged so as to be in contact with the inner surface of the forward rotation belt 72a, and the reverse rotation tension pulley 64b may be arranged so as to be contactable with the inner surface of the reverse rotation belt 72b.

Further, one tension pulley contacts the outer surface of the normal rotation belt 72a on the outer side of the raceway during normal rotation, and contacts the outer surface of the reverse rotation belt 72b on the outer side of the raceway to switch the rotation direction of the cooling fan 31. It can also be configured to.

In the switching mechanism 150, the intermediate input pulley 97, the intermediate output pulley 98, and the intermediate belt 73 can be omitted. In this case, the fan drive pulley 65 may be a double pulley, and the forward rotation belt 72a and the reverse rotation belt 72b may be respectively wound around the fan drive pulley 65.

As described above, the combine of the present embodiment includes the input pulley 54, the first pulley 51, the second pulley 52, the first belt 71, the fan drive pulley 65, the forward rotation belt 72a, and the reverse rotation belt. The belt 72b and the tension pulleys 64a and 64b are provided. The driving force of the engine 23 is input to the input pulley 54. The first pulley 51 rotates in the same direction as the input pulley 54. The second pulley 52 rotates in the opposite direction to the input pulley 54. The first belt 71 is wound around the input pulley 54, the first pulley 51, and the second pulley 52. The fan drive pulley 65 transmits the driving force to the cooling fan 31. The forward rotation belt 72a is provided so that the driving force of the first pulley 51 can be transmitted to the fan driving pulley 65. The reverse rotation belt 72b is provided so that the driving force of the second pulley 52 can be transmitted to the fan driving pulley 65. The tension pulleys 64a and 64b are provided so as to be able to contact the forward rotation belt 72a or the reverse rotation belt 72b. When the tension pulleys 64a and 64b contact the forward rotation belt 72a or the reverse rotation belt 72b, the driving force of the first pulley 51 or the second pulley 52 is transmitted to the fan drive pulley 65. When the surface of the forward rotation belt 72a is divided into the surface on the inner side of the raceway and the surface on the outer side of the raceway, and the surface of the belt for reverse rotation 72b is divided into the surface on the inner side of the raceway and the surface on the outer side of the raceway, the tension pulleys 64a and 64b are It is possible to selectively contact the same side surface (specifically, the outer peripheral surface which is the outer surface of the track) of the diversion belt 72a and the reversal belt 72b.

As a result, regardless of whether the rotation direction of the cooling fan 31 is normal rotation or reverse rotation, when the surfaces of the normal rotation belt 72a and the reverse rotation belt 72b are considered separately from the inside/outside of the track, the same side is considered. The tension pulleys 64a and 64b come into contact with the surface. Therefore, the driving force can be similarly transmitted to the fan drive pulley 65 during the forward rotation and the reverse rotation of the cooling fan 31. As a result, it is possible to favorably prevent a difference in reliability of drive transmission depending on the rotation direction of the cooling fan 31.

Although the preferred embodiment of the present invention has been described above, the above configuration can be modified as follows, for example.

In the first embodiment, the first interlocking pulley 61 contacts the outer surface of the second belt 72 to rotate the cooling fan 31 in the normal direction, and the second interlocking pulley 62 contacts the outer surface of the second belt 72. Therefore, the cooling fan 31 can be configured to be reversed.

In the first embodiment, the position changing device 100 may be configured to switch the rotation direction of the cooling fan 31 by rotating the support plate 90 around the drive shaft 68 instead of rotating the switching arm 80. it can.

The first belt 71, the second belt 72, the normal rotation belt 72a, and the reverse rotation belt 72b may be flat belts instead of the V belts.

The first pulley 51 and the first interlocking pulley 61 may be integrated to form a double pulley. The same applies to the second pulley 52 and the second interlocking pulley 62.

The orbits of the first belt 71, the second belt 72, the normal rotation belt 72a, the reverse rotation belt 72b, and the intermediate belt 73 can be appropriately changed.

Obviously, many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that the invention, within the scope of the appended claims, may be practiced otherwise than as described herein.

1 Combine 21 Engine Room 23 Engine 31 Cooling Fan 33 Dust Remover 51 First Pulley 52 Second Pulley 54 Input Pulley 61 First Interlocking Pulley 62 Second Interlocking Pulley 64a, 64b Tension Pulley 65 Fan Drive Pulley 71 First Belt 72 Second Belt 72a Forward rotation belt (first transmission belt)
72b Reverse rotation belt (second transmission belt)

Claims (4)

In a combine equipped with an engine room in which an engine is installed, and a cooling fan that sucks outside air into the engine room through a dust removing unit,
An input pulley for inputting the driving force of the engine,
A first pulley that rotates in the same direction as the input pulley;
A second pulley that rotates in a direction opposite to the input pulley;
A first belt wound around the input pulley, the first pulley, and the second pulley;
A fan drive pulley for transmitting a driving force to the cooling fan,
A second belt for transmitting the driving force of the first pulley or the driving force of the second pulley to the fan driving pulley;
Equipped with
When the surface of the second belt is divided into a surface on the inner side of the raceway and a surface on the outer side of the raceway, the driving force of the first pulley and the driving force of the second pulley with respect to the surface on the same side of the second belt. A combine capable of selectively transmitting any one of the driving forces. In a combine equipped with an engine room in which an engine is installed, and a cooling fan that sucks outside air into the engine room through a dust removing unit,
An input pulley to which the driving force of the engine is input,
A first pulley that rotates in the same direction as the input pulley;
A second pulley that rotates in a direction opposite to the input pulley;
A first belt wound around the input pulley, the first pulley, and the second pulley;
A fan drive pulley for transmitting a driving force to the cooling fan,
A first transmission belt provided so that the driving force of the first pulley can be transmitted to the fan driving pulley;
A second transmission belt provided so that the driving force of the second pulley can be transmitted to the fan driving pulley;
A tension pulley provided so as to be able to contact the first transmission belt or the second transmission belt;
Equipped with
When the tension pulley contacts the first transmission belt or the second transmission belt, the driving force of the first pulley or the second pulley is transmitted to the fan drive pulley,
When the surface of the first transmission belt is divided into a surface on the inner side of the raceway and the surface on the outer side of the raceway, and the surface of the second transmission belt is divided into a surface on the inner side of the raceway and a surface on the outer side of the raceway, the tension pulley is A combine which can selectively contact the same side surface of the first transmission belt and the second transmission belt. The combine according to claim 1 or 2, wherein
A first interlocking pulley that rotates in conjunction with the first pulley;
A second interlocking pulley that rotates in conjunction with the second pulley;
Equipped with
The rotation direction of the cooling fan is switched by switching between transmitting the driving force of the first interlocking pulley and transmitting the driving force of the second interlocking pulley to the fan drive pulley. Combine. The combine according to claim 3,
When the input pulley is rotating, the drive force of the input pulley is always transmitted to the first pulley and the second pulley.

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