JP6095545B2 - Working machine - Google Patents

Description

  The present invention relates to a work machine including a drive device that can be driven by reversing a radiator cooling fan forward and backward.

As described above, the work machine described in [1] below is known as a work machine including a drive device that can be driven by reversing the radiator cooling fan in the forward and reverse directions.
[1] A first transmission belt is wound around an output pulley mounted on an output shaft of an engine, an input pulley for driving a fan of a radiator, and an input pulley of an alternator. A forward rotation pulley contacting from the circumferential side and a reverse rotation pulley contacting from the outer circumferential side are provided. Further, the second transmission belt is wound around the input fan for driving the fan of the radiator and the forward and reverse pulleys.
The first transmission belt is divided into a normal rotation state in which the forward rotation pulley is pressed against the first transmission belt and the reverse rotation pulley is separated, and a reverse rotation state in which the reverse rotation pulley is pressed and the forward rotation pulley is separated. The input pulley for driving the radiator fan can be switched between the normal rotation state and the reverse rotation state by switching the operation state between the forward rotation pulley and the reverse rotation pulley (see Patent Document 1).

JP 2001-263063 A (paragraph [0022, 0023], FIG. 3, FIG. 4)

In the engine cooling device for a work vehicle described in Patent Literature 1 above, the forward rotation pulley and the reverse rotation pulley are pressed against the inner peripheral surface and the pressed direction against the outer peripheral surface with respect to the first transmission belt. The forward / reverse rotation is switched by changing the pressing direction from the two opposite directions. As described above, the forward / reverse rotation of the input fan pulley for driving the radiator fan can be switched by the selective pressing action of the forward rotation pulley and the reverse rotation pulley against the first transmission belt. This is useful in that a forward / reverse switching structure can be obtained.
However, in this structure, the forward rotation pulley and the reverse rotation pulley do not simply switch the first transmission belt between the tension state and the relaxation state, and the normal rotation pulley and the reverse rotation pulley transmit power. It is also used as a means. That is, it is provided not only for changing the tension of the transmission belt but also as a power transmission member. Therefore, in order to give a frictional force capable of transmitting power to the forward rotation pulley and the reverse rotation pulley, it is necessary to increase the winding range of the transmission belt around the forward rotation pulley and the reverse rotation pulley.

However, from the state where transmission is performed with a large winding range of the transmission belt with respect to the pulley peripheral surface of either the forward rotation pulley or the reverse rotation pulley, the winding range of the other pulley peripheral surface is large. In order to perform switching in this manner, it is necessary to largely swing the forward rotation pulley and the reverse rotation pulley to increase the winding range of the transmission belt around the forward rotation pulley and the reverse rotation pulley.
For this reason, there is a risk that the transmission belt will loosen during the forward / reverse switching operation and may come off from the peripheral surface of the pulley, or the forward / reverse switching operation may be difficult to perform quickly. There is room for improvement in these respects.

  According to the present invention, power transmission from the engine to the radiator cooling fan has a rational structure and a simple structure.

[Solution 1]
The technical means of the working machine in the present invention taken to solve the above problems includes a radiator, a radiator cooling fan, and a drive device that drives the radiator cooling fan based on engine power, and the drive device is Two power transmission mechanisms are provided: a forward rotation power transmission mechanism capable of transmitting normal rotation power in an endless rotation band, and a reverse rotation power transmission mechanism capable of transmitting reverse rotation power in a separate endless rotation band. And a forward / reverse selection mechanism capable of selectively selecting power from one of the two power transmission mechanisms and transmitting it to the input rotor of the radiator cooling fan. der thing was is,
The forward / reverse selection mechanism selectively selects the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism to cause tension or relaxation. It is composed of a tension clutch that can be interrupted,
The forward / reverse selection mechanism includes a first tension ring body that acts on an endless rotation band of the forward rotation system power transmission mechanism, and a second tension wheel body that operates on an endless rotation band of the reverse rotation system power transmission mechanism. , Supported by a single swing arm.

[Operation and effect of invention according to Solution 1]
According to the configuration of the present invention relating to the above solution 1, the endless rotation band of the forward rotation system power transmission mechanism capable of transmitting the normal rotation power, and the endless rotation band of the reverse rotation system power transmission mechanism capable of transmitting the reverse rotation power, By selectively selecting one of them with the forward / reverse selection mechanism, the power from either power transmission mechanism is transmitted to the input rotating body of the radiator cooling fan, so that the radiator cooling fan is forward / reverse. I am letting.
For this reason, the forward / reverse selection mechanism itself may be configured so that the power of the endless rotation band of either the forward or reverse power transmission mechanism is transmitted to the input rotating body of the radiator cooling fan. No role is required.
Therefore, as the forward / reverse selection mechanism, there is no need for a mechanism that increases the winding range of the endless rotation band for power transmission, and the operation for that is simplified, and the structure of the forward / reverse selection mechanism is simplified and operability is improved. There is an advantage that can be improved.

[Solution 2]
Another technical means of the present invention taken to solve the above-mentioned problems is that the input rotating body includes an endless rotation band of the forward rotation power transmission mechanism and an endless rotation band of the reverse rotation power transmission mechanism. Is wound around.

[Operation and effect of invention according to Solution 2]
According to the configuration of the invention relating to the solving means 2 described above, both the endless rotation band of the forward rotation power transmission mechanism and the endless rotation band of the reverse rotation power transmission mechanism are wound around the input rotating body. With this configuration, the configuration of the input rotator can be simplified. Since only the power transmitted to the endless rotation band on either the forward rotation side or the reverse rotation side is transmitted to the input rotating body, the forward / reverse rotation of the radiator cooling fan can be reliably switched.

[Solution 3]
Another technical means of the present invention taken to solve the above problem is that the endless rotation band of the forward rotation power transmission mechanism and the endless rotation band of the reverse rotation power transmission mechanism are the same drive rotation. It means that it is wound around the body.

[Operation and effect of invention according to Solution 3]
According to the configuration of the invention relating to the above solution 3, the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism can transmit rotation in the same direction. Power can be transmitted to both endless rotation zones using the same drive rotator.
Therefore, there is an advantage that the structure can be easily constructed without requiring means for forward / reverse switching on the side of the drive rotator for transmitting the drive force.

[Solution 4]
Another technical means of the present invention taken to solve the above problem is that one of the endless rotation band of the forward rotation power transmission mechanism and the endless rotation band of the reverse rotation power transmission mechanism is The input rotating body is wound so as to be in contact with the inner peripheral surface of the inner and outer peripheral surfaces of the endless rotation band, and is wound so that the other is in contact with the outer peripheral surface. .

[Operations and effects of invention according to Solution 4]
According to the configuration of the invention relating to the solution means 4 described above, the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism are rotated in the same direction, but contact with the input rotating body is performed. By winding the state so that one of the endless rotation bands is in contact with the inner peripheral surface side and the other is in contact with the outer peripheral surface side, the rotational transmission direction with respect to the input rotating body can be switched between forward and reverse.
Therefore, depending on how the endless rotation band is wound around the input rotating body, it is possible to perform forward rotation power transmission and reverse rotation power transmission without adding a special component or the like. There is an advantage that the structure of the rotating system power transmission mechanism and the reverse system power transmission mechanism can be simplified.

[Solution 5]
The other technical means of the present invention taken in order to solve the above-mentioned problems are as follows: the input rotator is respectively provided on both sides of a virtual line segment connecting the axis of the drive rotator and the axis of the input rotator. A ring body is provided in a state of being positioned on the inner peripheral surface side of the endless rotation belt wound so as to be in contact with the outer peripheral surface side, and either one or both of these ring bodies is the input. That is, the endless rotation belt wound so as to be in contact with the rotating body on the outer peripheral surface side is configured to be movable to a side to be tensioned or relaxed.

[Operation and effect of invention according to Solution 5]
According to the configuration of the invention relating to the solution means 5 described above, the inner peripheral side is wound around the ring body distributed on both sides of the imaginary line segment connecting the axis center of the drive rotator and the axis center of the input rotator. An endless rotation band is provided, and the endless rotation band is wound so as to be in contact with the input rotating body on the outer peripheral surface side. And since either or both of the said ring bodies are moved to the side which makes an endless rotation zone which touches an input rotating body in an outer peripheral surface side tense or relax, it seems to touch an input rotating body on the outer peripheral surface side. It is possible to move the endless rotation belt wound around the side toward the side where tension or relaxation is maintained while maintaining a state where the winding range with respect to the input rotating body is wide.
Therefore, the movement direction of the ring body relative to the endless rotation band is a pressing or releasing operation in one direction with respect to the inner circumferential side, and the endless rotation is performed while the movement amount of the ring body is relatively small. There is an advantage that it is possible to enable tension or relaxation while maintaining a wide winding range with respect to the input rotating body that is the transmission target of the belt.

[Solution 6]
Another technical means of the present invention taken in order to solve the above-mentioned problem is that the endless rotation band of the forward rotation system power transmission mechanism is on the inner peripheral surface side of the inner and outer peripheral surfaces with respect to the input rotating body. It is that it is wound to touch.

[Operations and Effects of Invention According to Solution 6]
According to the configuration of the invention relating to the solving means 6 described above, the endless rotation band of the forward rotation type power transmission mechanism that tends to be used more frequently during the operation time of the work machine or on the side where the use time is larger is the input rotating body Therefore, it is easy to increase the winding range for the input rotating body to be transmitted. As a result, there is an advantage that it is easy to keep the transmission efficiency by the forward rotation power transmission mechanism having a high use frequency and long use time in a good state.

[Solution 9]
Another technical means of the present invention taken to solve the above problem is that the axis of the swing arm is the same as the axis of the input rotating body.

[Operations and effects of invention according to Solution 9]
According to the configuration of the invention relating to the solving means 9 described above, it is possible to further simplify the forward / reverse selection mechanism by configuring the axis of the swing arm to be the same as the axis of the input rotating body. It is a thing.

[Solution 10]
Another technical means of the present invention taken in order to solve the above-described problem is that the forward / reverse selection mechanism biases the forward rotation power transmission mechanism to a state in which the endless rotation band is tensioned. It is that it was provided.

[Operations and Effects of Invention According to Solution 10]
According to the configuration of the invention relating to the solution means 10 described above, the endless rotation band of the forward rotation type power transmission mechanism that tends to be used more frequently during the operation time of the work machine or on the side with the longer use time is strained. Because it is equipped with an urging mechanism that urges the motor in the reverse state, the reverse drive operation is performed only when using a reverse power transmission mechanism that is less frequently used or used for less time. Therefore, it can be conveniently used without forgetting to return to the normal rotation driving state.

[Solution 11]
Another technical means of the present invention taken in order to solve the above-mentioned problem is that the forward / reverse selection mechanism is provided with an operation lever capable of operating the swing arm.

[Operations and Effects of Invention According to Solution 11]
According to the configuration of the invention relating to the solving means 11 described above, since the operation lever capable of operating the swing arm is provided, there is an advantage that the forward / reverse switching by human operation can be easily performed.

[Solution 12]
Another technical means of the present invention taken in order to solve the above problem is that the operation lever is extended to the side opposite to the side where the engine is present.

[Operations and Effects of Invention According to Solution 12]
According to the configuration of the invention relating to the solving means 12, the operation lever is extended on the side opposite to the side where the engine is present, so that the operation is not performed while avoiding the engine peripheral device, but the space with a relatively large margin. There is an advantage that the operation can be easily configured.

[Solution 13]
Another technical means of the present invention taken in order to solve the above problem is that the fuselage lateral outer side of the engine is covered with a side cover, and the operating lever is not covered with the side cover. It is that it is provided in an exposed state.

[Operations and Effects of Invention According to Solution 13]
According to the configuration of the invention relating to the solving means 13 described above, there is an advantage that the operation lever can be easily operated without requiring the opening and closing operation of the side cover.

[Solution 14]
Another technical means of the present invention taken to solve the above problem is that the operating lever is connected to the swing arm.

[Operations and Effects of Invention According to Solution 14]
According to the configuration of the invention relating to the solution means 14 described above, since the swing arm can be directly operated by the operation lever, there is an advantage that an unnecessary linkage structure can be omitted and the forward / reverse selection mechanism can be more easily configured. is there.

[Solution 15]
Another technical means of the present invention taken in order to solve the above-mentioned problem is that power from the engine is transmitted to the drive device.

[Operations and Effects of Invention According to Solution 15]
According to the configuration of the invention relating to the solution means 15 described above, there is no need for a separate drive means such as an electric motor for driving the forward / reverse selection mechanism, and as a work machine for driving various work devices and traveling systems. There is an advantage that cost can be reduced by effectively using the engine power used.

[Solution 16]
Another technical means of the present invention taken in order to solve the above-described problem is that the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism are wound around the drive rotation. The body is configured to serve as a relay rotating body in a power transmission system from the engine to the radiator cooling fan.

[Operations and Effects of Invention According to Solution 16]
According to the configuration of the invention relating to the solution means 16 described above, the drive rotator that transmits the driving force to the forward / reverse selection mechanism also serves as the relay rotator provided in the power transmission system from the engine to the radiator cooling fan. There is an advantage that the structure can be simplified and the cost can be reduced by sharing the members.

[Solution 17]
Another technical means of the present invention taken in order to solve the above-mentioned problems is that the engine is arranged in a position on one side of the traveling vehicle body with the output shaft directed in the left-right direction, the vehicle body rear side position of the engine, Alternatively, the radiator is disposed at a location on the front side of the vehicle body of the engine or a location on the upper side of the vehicle body of the engine.

[Operations and Effects of Invention According to Solution 17]
According to the configuration of the invention relating to the solving means 17 described above, the sum of the axial lengths of the engine and the radiator can be shortened compared to the case where the radiators are arranged side by side in the axial direction of the output shaft of the engine. Therefore, there are advantages such as arranging the engine as close as possible to the outer side of the aircraft to secure a space for arranging other devices on the inner side of the aircraft, and facilitating maintenance of the engine from the outer side of the aircraft. is there.

[Solution 18]
Another technical means of the present invention taken in order to solve the above-described problem is that the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism are wound around the drive rotation. The body includes a plurality of winding portions on which an endless rotation band of the driving device with respect to the radiator cooling fan and a driving side endless rotation band for transmitting power from the engine are stretched, and the driving side endless rotation That is, the moving band is configured to be located on the outer side of the body with respect to the endless rotation band of the driving device.

[Operations and Effects of Invention According to Solution 18]
According to the configuration of the invention relating to the solving means 18, the transmission system from the engine deployed on the outer side of the aircraft to the radiator cooling fan deployed on the outer side of the aircraft includes the driving-side endless rotation belt and the radiator cooling fan. There is an advantage that it is reasonably easy to dispose by the endless rotation band of the driving device.

It is a right view of a combine. It is a whole top view of a combine. It is a top view which shows the state which removed the grain tank in the combine. It is a side view which shows the power transmission structure from an engine to a radiator cooling fan. It is a top view which shows the power transmission structure from an engine to a radiator cooling fan. It is a side view which shows the normal transmission state in a normal / reverse rotation selection mechanism. It is a side view which shows the reverse transmission state in a forward / reverse selection mechanism. It is an enlarged side view showing a forward / reverse selection mechanism. The forward / reverse selection mechanism is shown, (a) is a plan view, and (b) is a partially enlarged view. It is a rear view which shows a forward / reverse selection mechanism. It is a disassembled perspective view which shows the attachment structure of a forward / reverse rotation selection mechanism. It is a diagram which shows a power transmission system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
〔overall structure〕
1 to 5 show an all-throw-in type (ordinary type) combine which is an example of a combine according to the present invention. FIG. 1 shows the right side of the entire aircraft, and FIG. 2 shows the plane. FIG. 3 is a plan view showing a state where the grain tank 5 is removed and the threshing device 4 is exposed.

As shown in these drawings, the full throw-in type combine described above 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 part) is provided at the front part of the body frame 1, a threshing device 4 and a glen tank 5 are provided at the rear side thereof, and a waste wall treatment device 16 is provided at the rear part. On the other hand, a cutting processing device 17 that moves up and down around a horizontal horizontal axis (not shown) is provided at the front portion to constitute a self-propelled aircraft.
The engine 3 is mounted on the lateral side of the threshing device 4 at the front portion on the body frame 1, and the radiator 7 is disposed at a rear position away from the engine 3. A fuel tank 12 is mounted on the opposite side of the threshing device 4 from the engine 3. The power of the engine 3 is transmitted to the threshing device 4, the cutting processing device 17, the radiator cooling fan 70 that cools the radiator 7, and the like, in addition to the traveling device 2 described above.

The power transmitted to the front wheel 2F of the traveling device 2 via the front wheel drive shaft 24 extending from the transmission 20 mounted on the front portion of the vehicle body frame 1 to the left and right is transmitted to the vehicle body side of the front wheel 2F. It is configured to be transmitted to the front wheel 2F via the speed reduction case 25 provided in a state of entering the recessed portion formed on the facing surface and the front axle 2a supported by the speed reduction case 25.
Thus, the front wheel 2F is mounted so that the power of the engine 3 is transmitted through the front axle 2a and is driven to rotate around the horizontal horizontal axis x1 of the front axle 2a. All of the diameters are constituted by non-steering wheels made of tire wheels larger than the rear wheel 2R.

  As shown in FIGS. 4 and 5, the rear wheel 2R is a rear wheel support frame (not shown) mounted on the rear portion of the vehicle body frame 1 so as to be swingable left and right around a longitudinal axis (not shown). ) And the steering wheel provided with the rear axle 2b that can be steered around the vertical swing axis. The rear wheel 2R is composed of a tire wheel whose left-right width and diameter are set smaller than those of the front wheel 2F, and rotates around a horizontal horizontal axis x2 of the rear axle 2b.

[Reaping processing device]
As shown in FIGS. 1 to 3, a cutting processing device 17 that moves up and down around the horizontal axis along the left-right direction is provided on the front side of the threshing device 4 mounted on the vehicle body frame 1.
This cutting processing device 17 includes a feeder 17A that supplies crops such as stalks that have been cut to the threshing device 4, a scraping reel 17B that scrapes crop tips such as planting stalks, and a stock source side. The cutting device 17C for cutting and the lateral feed auger 17D that collects the harvested crops in the central portion in the cutting width direction are provided, so that the crops are harvested, fed into the feeder 17A, and supplied to the threshing device 4.
Although not shown, the feeder 17A is equipped with an endless belt-like carrier that rotates in the front-rear direction inside a rectangular tube-like case, and is configured to convey the fed harvested crops upward and rearward. Has been. The crop conveyance direction by the feeder 17A is the front-rear direction along the handling cylinder rotation axis p0 (see FIG. 4) of the handling cylinder 40 in the threshing device 4, and the scraping reel 17B or the like along with the lifting operation of the feeder 17A portion. The reaping device 17C and the transverse feed auger 17D are also configured to be able to move up and down.

[Threshing equipment]
As described above, the threshing device 4 is disposed on the body frame 1 so that the barrel 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 and rear barrel rotation axis p0 of the barrel 40 disposed inside, the entire threshing device 4 is also It is arranged in a state of being deviated to the left with respect to the center line CL in the left-right direction of the airframe.

The feeder 17A for supplying the harvested crop to the threshing device 4 is arranged in a state of being deviated to the left side with respect to the center line CL in the left-right direction of the machine body as in the threshing device 4, as shown in FIG. In addition, the transmission 20 that is biased to the right with respect to the center line CL in the left-right direction of the machine body is disposed at a position that partially overlaps in plan view.
The waste straw processing device 16 is integrally attached to the rear portion of the threshing device 4, and is configured to cut the waste straw after the threshing treatment and discharge it to the outside.

The threshing device 4 is formed in a rectangular box shape that is long in the longitudinal direction of the machine body, and includes a tang 41 at the front end thereof (see FIG. 12). The chopping shaft 41a provided with the blower blades of the tang ridge 41 is extended to the right lateral outer side of the threshing case 4A. An input pulley 41b (corresponding to a threshing side rotating body) is mounted.
The threshing device 4 is not provided with a secondary tang and is configured to blow air to the selected portion using only the tang 41.

  Inside the threshing device 4, a handling cylinder 40 for threshing the harvested crop fed from the feeder 17A side is arranged so as to be driven to rotate around a handling cylinder axis 40a in the front-rear direction. In addition to the handling barrel 40, a sorting processing device 42 that swings and sorts the harvested crop that has been threshed by the handling barrel 40 and the like are provided along with the air blowing action of the Karatsu 41.

[Glen tank]
As shown in FIG. 1 to FIG. 3, the Glen tank 5 is located on the rear side of the operation cabin 15 and on the left side of the tank support 13 that is erected on the right side of the body frame 1. Is provided across the upper side of the threshing device 4.
The Glen tank 5 is mounted with a box-shaped tank body 51 having a width in the left-right direction over almost the entire width in the left-right direction of the fuselage on the upper side of a bottom frame 50 formed in a lattice shape by assembling various steel materials such as square pipes. It is.
The bottom frame 50 and the tank body 51 are integrally connected, and supported by a swing support shaft 52 provided at the upper end of the tank support 13 so as to be swingable around a swing axis z2 in the front-rear direction. Has been.

As shown in FIGS. 1, 3, and 4, 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 includes an outer support 13 </ b> A disposed on the side farther from the threshing device 4 and an inner support 13 </ b> B disposed on the side closer to the threshing device 4 than that. The lower end portion of the outer support column 13A and the lower end portion of the inner support column 13B are fixed to the vehicle body frame 1, and the upper end portions of the outer support column 13A and the inner support column 13B are connected to the upper frame 13C. An end of the grain discharge port 5A corresponding to one end of the grain tank 5 in the left-right direction is connected to and supported by the upper frame 13C so as to swing up and down around the swing axis z2 in the front-rear direction. .
A hydraulically driven dump cylinder 53 is interposed between the inner column 13 </ b> B of the tank support 13 and the bottom frame 50 of the Glen tank 5. By the expansion and contraction operation of the dump cylinder 53, the swing axis of the Glen tank 5 is brought into the storage posture in which the bottom surface of the tank main body 51 is horizontal or substantially horizontal and the discharge posture in which the bottom surface is lifted to the upright side. The posture can be changed by swinging up and down around z2.

  As shown in FIGS. 4 and 5, a radiator 7 is disposed at the rear portion of the tank support 13. The radiator 7 is attached in a state where the front end side is supported by the rearmost outer support 13A, the upper part is attached to the upper frame 13C, and the lower part is supported by the radiator support leg 1a erected from the body frame 1. ing.

[Driving cabin]
As shown in FIGS. 1 and 3, the driving cabin 15 is mounted and installed on a driving unit frame 11 erected on the vehicle body frame 1.
Thus, the driving cabin 15 is supported by the vehicle body frame 1 via the driving unit frame 11 at a position higher than the upper edge of the outer diameter of the front wheel 2F and at a position ahead of the rear edge of the front wheel 2F. .

  In the driving cabin 15, a steering handle 15a for steering operation, a driving seat 15b, and the like are arranged, and the rear wheel 2R is steered by the operation of the steering handle 15a. Although not shown in the figure, various operating tools and instruments for maneuvering operations and work operations are provided in the driving cabin 15.

[Power transmission structure]
Next, a power transmission structure that transmits the power of the engine 3 to the threshing device 4 and the radiator cooling fan 70 will be described.
As shown in FIGS. 3, 4, and 12, the engine 3 is disposed at a position on the right outer side on the vehicle body frame 1 with a crankshaft (not shown) along the left-right direction of the body.
An output pulley 30 as an engine output rotating body is provided on one end side (inside the body) of the engine 3 in the left-right direction with the flywheel (not shown) in the state where the axial direction is along the left-right direction of the body. Yes. On the other end side (outer side of the machine body), an output shaft 31 protrudes, and a second output pulley 31 a is attached to the output shaft 31. The power of the engine 3 is extracted from the second output pulley 31a as the driving force of the radiator cooling fan 70 via a forward / reverse selection mechanism 6 described later.

The output pulley 30 is provided with three belt grooves for winding the first transmission belt 32 formed of a set of three V belts, which are an example of an endless rotation belt, on the outer peripheral portion thereof.
The transmission 20 located on the front side of the engine 3 and on the inner side of the body (left side in the left-right direction) than the engine 3 is provided with an input shaft 21 that protrudes on the outer side of the body (right side in the left-right direction). In addition, an input / output pulley 22 is mounted on the input shaft 21 so as to rotate integrally as an input rotating body.

The input / output pulley 22 includes a first rotating body portion 22A having three belt grooves for winding the three V belts of the first transmission belt 32, and a second transmission belt 33 described later. A second rotating body portion 22B having two belt grooves for winding is provided. The second rotating body portion 22B has a role as an output rotating body for transmitting engine power to the threshing device 4.
The first rotator portion 22A and the second rotator portion 22B are constituted by a multiple pulley integrally molded, the first rotator portion 22A side is located on the outer side of the machine body where the engine 3 is present with a large diameter, The rotating body portion 22B has a small diameter, and is located closer to the body side where the threshing device 4 exists.
The transmission 20 is provided with a continuously variable transmission 23 for shifting the power input by the input shaft 21 and transmitting it to the traveling device 2 on the side opposite to the side where the input / output pulley 22 is provided, The power shifted by the continuously variable transmission 23 is configured to be output from the front wheel drive shaft 24 via a transmission mechanism (not shown) provided inside the transmission 20.

A second transmission belt 33 constituted by a set of two V belts, which is an example of an endless rotation band, is wound around the second rotating body portion 22B of the input / output pulley 22.
The second transmission belt 33 is wound around a threshing input pulley 41b provided on the tang shaft 41a of the threshing device 4, and the engine power is transmitted from the second rotating body portion 22B via the second transmission belt 33. It is comprised so that it may input.
The threshing input pulley 41b on the side of the tang shaft 41a is formed to have a larger diameter than the second rotating body portion 22B and the output pulley 30, and is configured so that the engine speed is reduced and transmitted to the tang shaft 41a. ing.

As shown in FIG. 12, the engine power input to the rod shaft 41a is treated as a harvesting side drive mechanism 43 for driving the handling barrel 40 and a harvesting side drive for transmitting power to the harvesting processing device 17 including the feeder 17A. The mechanism 44 and the sorting side driving mechanism 45 for driving the sorting processing device 42 and the like are distributed and supplied. Each of the handling cylinder side drive mechanism 43, the cutting side drive mechanism 44, and the sorting side drive mechanism 45 includes a transmission belt. The power is also transmitted from the lower transmission side of the sorting-side drive mechanism 45 to the waste straw processing device 16 via the transmission belt 46.
The sorting-side drive mechanism 45 includes a transmission belt 45a that transmits power to the first screw 42a and the lifting device 47, a transmission belt 45b that transmits power to the second screw 42b and the second reduction device 48, and a swing sorting plate. And a transmission belt 45c for transmitting power to 42c.

Power transmission to the radiator cooling fan 70 is performed via the third transmission belt 34 as shown in FIGS.
The third transmission belt 34 is positioned on the side closer to the radiator cooling fan 70 and the upper side transmission belt 34A (corresponding to the driving-side endless rotation belt) positioned on the side closer to the engine 3 with the relay shaft 35 interposed therebetween. A lower-side transmission belt 34B (corresponding to an endless rotation band of the driving device) is provided.
The upper transmission belt 34A includes a second output pulley 31a provided on the output shaft 31 located on the opposite side of the output pulley 30 of the engine 3, and an end portion of the relay shaft 35 on the outer side of the machine body (the right side in the left-right direction). It is constituted by a V-belt wound around a relay input pulley 35a (corresponding to a drive rotator and also serving as a relay rotator) provided at the end.

The lower-side transmission belt 34B has a pair of relay output pulleys 35b and 35c (on the drive rotating body) as a plurality of winding portions provided at the end of the relay shaft 35 on the inward side (the left end in the left-right direction). And forward rotation transmission belt 36 (normal rotation system power) wound around a fan input pulley 72 (corresponding to the input rotation body) supported by the support shaft 71 of the radiator cooling fan 70. And a reverse transmission belt 37 (corresponding to an endless rotation band of the reverse power transmission mechanism).
That is, one of the forward transmission belt 36 and the reverse transmission belt 37 is selected so as to be in the transmission state by the forward / reverse selection mechanism 6, and the selected forward rotation transmission belt 36 or reverse transmission is selected. The belt 37 is configured to function as a lower-side transmission belt 34 </ b> B that transmits power to the fan input pulley 72.

As described above, the relay input pulley 35a, the relay output pulley 35b, and the relay output pulley 35c attached to the relay shaft 35 constitute a plurality of winding portions of the drive rotator, and the drive rotator and the lower transmission belt 34B. Constitutes a driving device for driving the radiator cooling fan 70.
In this drive device, the upper transmission belt 34A, which is a driving-side endless rotation band wound around the relay input pulley 35a, is an endless rotation band of the drive device wound around the relay output pulleys 35b, 35c. It is provided so as to be located on the outer side of the aircraft with respect to a certain lower side transmission belt 34B.

The third transmission belt 34 and the like, which are a power transmission structure from the engine 3 to the radiator cooling fan 70, are covered by the side cover 9 on the lateral outer side of the engine 3 and the lateral outer side of the radiator 7. It is in a state of being stored in the space s1 shielded from the outside.
As shown in FIG. 4, the space s <b> 1 has a third transmission belt 34 that transmits power from the output shaft 31 of the engine 3 positioned in front of the lower portion to the radiator cooling fan 70 located slightly higher in the rearward direction. At the time of deployment, the intermediate part in the front-rear direction is formed so as to be lifted upward using the relay shaft 35.
Thereby, the volume of the space existing below the third transmission belt 34 is increased so that it can be effectively used as a maintenance space.

[Forward / reverse selection mechanism]
The forward / reverse selection mechanism 6 will be described.
The forward / reverse selection mechanism 6 has the power of either the forward drive belt 36 or the reverse drive belt 37 with respect to the fan input pulley 72 around which the forward drive belt 36 and the reverse drive belt 37 are wound. Is selected, and the rotation direction of the fan input pulley 72 is switched between the forward rotation direction and the reverse rotation direction by selecting a transmission state so that the other power is not transmitted.
The forward rotation direction of the fan input pulley 72 is a direction in which the air blowing direction by the radiator cooling fan 70 is directed from the lateral side outward to the inward side and the suction action by the radiator cooling fan 70 acts on the radiator 7. The reverse rotation direction is a direction in which the air blowing direction by the radiator cooling fan 70 is directed in the opposite direction. In this reverse direction, the air blowing direction by the radiator cooling fan 70 is directed from the inside of the body to the outside, and the dust attached to the dust-proof net 7a existing outside the body of the radiator 7 can be blown out to the outside. .

As shown in FIGS. 4 to 11, the fan input pulley 72 installed on the inward side of the radiator 7 is supported by the fan mounting base 8 erected on the vehicle body frame 1.
The fan mounting base 8 includes a flat seat plate 81 at the upper end portion of a column 80 erected on the body frame 1. A board 82 mounted on the upper surface side of the seat plate 81, a square tubular member 83 disposed along the front-rear direction on the upper side of the substrate 82, and a plate surface on the upper surface side of the square tubular member 83. A mounting plate 84 standing up along the front-rear direction is fixed by welding. The seat plate 81 and the board 82 are connected and fixed detachably with connecting bolts with their plate surfaces contacting each other.

As shown in FIGS. 8 to 11, a support shaft 71 for pivotally supporting the fan input pulley 72 is fixed to the mounting plate 84 while penetrating the plate surface of the mounting plate 84. In other words, a connecting plate 73 having a hook-shaped contact surface facing the mounting plate 84 is fixed to the support shaft 71 by welding, and the connecting plate 73 is bolted to the mounting plate 84 with the connecting plate 73 in contact therewith. It is.
A swing arm 60 is attached to a portion of the mounting plate 84 that is bolted to the mounting plate 84 so as to protrude outward from the body of the mounting plate 84, and a portion that protrudes inward of the body through the mounting plate 84. An operation lever 62 is attached. The swing arm 60 and the operation lever 62 are pivotally supported in a state where movement of the support shaft 71 in the axial direction is blocked by the circlip 71a.

The swing arm 60 is formed with a projection pin 61 projecting toward the operation lever 62 side, and an engagement hole 62a into which the head of the linkage pin 61 can be fitted is formed on the operation lever 62 side. ing. The mounting plate 84 is formed with a long hole 84a in a predetermined range along the arc locus of the linking pin 61 around the axis p2 of the support shaft 71.
Therefore, when the linkage pin 61 of the swing arm 60 is fitted into the engagement hole 62a of the operation lever 62 in a state of passing through the long hole 84a of the mounting plate 84, the swing arm is moved along with the swing operation of the operation lever 62. 60 can be swung around the axis p2 of the support shaft 71 within a predetermined range of the long hole 84a.

The swing arm 60 includes arm portions 60A and 60B extending in two directions away from the axis p2 of the support shaft 71. One arm portion 60A is provided with a support shaft 63a of a first tension ring body 63 acting on the forward transmission belt 36, and the other arm portion 60B is provided with a second tension ring body acting on the reverse transmission belt 37. 64 support shafts 64a are provided.
As shown in FIG. 9, in the swing arm 60, the arm portion 60A to which the first tension ring body 63 is attached is more attached than the arm portion 60B to which the second tension ring body 64 is attached. It is located away from the plate 84 and on the outer side of the body.
Further, as shown in FIGS. 8, 9 and 11, the arm portion 60A to which the first tension ring body 63 is attached is on the side (in the clockwise direction in FIG. 8) on which the forward transmission belt 36 is tensioned. A locking piece 66a for locking a coil spring 66 (corresponding to a biasing mechanism) that biases rotation is provided. The other end side of the coil spring 66 is connected to the support 80 of the fan mounting base 8 and is stretched so that a biasing force to the side that always tensions the forward rotation transmission belt 36 acts on the swing arm 60. is there.

The reverse transmission belt 37 is provided so as to be wound around the third tension ring body 65 in addition to the second tension ring body 64.
The third tension ring body 65 is pivotally supported by a support shaft 65 a provided on the mounting plate 84, and is not changed in position by the swinging operation of the operation lever 62 but is fixed on the mounting plate 84. It is provided.
As shown in FIGS. 6 and 7, the second tension ring body 64 and the third tension ring body 65 include a shaft center p <b> 1 of the relay output pulleys 35 b and 35 c that are drive rotating bodies and a fan that is an input rotating body. The input pulley 72 is arranged in a state of being distributed on both sides of an imaginary line segment L connecting the axis p2 of the support shaft 71 that is the rotation center of the input pulley 72.

The forward transmission belt 36 is wound around the relay output pulley 35b on the outer side of the machine body, the fan input pulley 72, and the first tension ring body 63 among the relay output pulleys 35b and 35c that are drive rotating bodies. Yes. The relay output pulley 35 b, the fan input pulley 72, and the first tension ring body 63 are all disposed so as to be in contact with the inner peripheral side of the normal rotation transmission belt 36.
Therefore, as shown in FIG. 6, when the operation lever 62 is operated to the “forward rotation” position indicated by the solid line, the swing arm 60 swings clockwise, and the forward drive belt 36 is tensioned. The first tension ring body 63 is moved. The position of the first tension ring body 63 is maintained so as to be in the normal transmission state even when the hand is released from the operation lever 62 due to the urging force of the coil spring 66 acting.
At this time, the arm portion 60 </ b> B of the swing arm 60 that supports the second tension ring body 64 is swinging (swings clockwise) to loosen the reverse transmission belt 37, and power is transmitted by the reverse transmission belt 37. Is in a state that is not performed.

The reverse transmission belt 37 includes a relay output pulley 35c, a fan input pulley 72, a second tension ring body 64, and a third tension ring body on the inner side of the relay output pulleys 35b and 35c, which are drive rotating bodies. It is wound over 65.
Among these, the relay output pulley 35 c, the second tension ring body 64, and the third tension ring body 65 are in contact with the inner peripheral side of the reverse transmission belt 37, and the fan input pulley 72 is in contact with the outer peripheral side of the reverse transmission belt 37. Thus, the reverse transmission belt 37 is wound.
Therefore, as shown in FIG. 7, when the operation lever 62 is operated to the “reverse rotation” position, the swing arm 60 swings counterclockwise against the biasing force of the coil spring 66, and the reverse rotation transmission belt 37 is moved. The second tension ring body 64 is moved to the tension side. The reverse transmission belt 37 that is tensioned in this state is in the reverse transmission state.
At this time, the arm portion 60 </ b> A of the swing arm 60 that supports the first tension ring body 63 swings (sways counterclockwise) to loosen the normal transmission belt 36, and the normal transmission belt 36. The power transmission by is not performed.

As described above, the forward output power transmission mechanism is configured by including the relay output pulley 35b, the fan input pulley 72, the first tension ring body 63, and the forward transmission belt 36, and the relay output pulley 35c and the fan input pulley 72 are configured. The reverse tension power transmission mechanism includes the second tension ring body 64, the third tension ring body 65, and the reverse rotation transmission belt 37.
The forward / reverse selection mechanism 6 causes the forward rotation transmission belt 36 of the forward rotation system power transmission mechanism and the reverse rotation transmission belt 37 of the reverse rotation system power transmission mechanism to swing the swing arm 60 by operating the operation lever 62. It is constituted by a tension clutch capable of intermittently motive power by selectively selecting and tensioning or relaxing.
The swing operation of the swing arm 60 by the operation of the operation lever 62 is maintained even when the operation force by the operation lever 62 is released by the biasing force of the coil spring 66 while the switching state to the forward rotation side is maintained. The operation to the reverse side is continued only while the swing arm 60 is swinging by the operation of the operation lever 62. When the operation by the operation lever 62 is released, the forward rotation is performed by the biasing force of the coil spring 66. The drive is automatically restored.

  The reference numeral 67 shown in FIGS. 8, 9 and 11 is a rod-shaped anti-slip guide provided integrally with the swing arm 60, and the reference numeral 68 is a plate-like anti-skid guide bent into an L shape. is there. Reference numeral 84 b denotes a rod-shaped detachment prevention guide provided on the mounting plate 84. These are all for preventing the forward transmission belt 36 or the reverse transmission belt 37 from coming off.

The operation lever 62 extends toward the rear side of the airframe opposite to the front side of the airframe where the engine 3 exists, on the side closer to the airframe than the side cover 9 provided on the lateral outer side of the airframe. The end portion is provided in a state of being exposed to the rear side from the rear end of the side cover 9.
As shown in FIG. 1, the side cover 9 is provided outside the space s1 on the vehicle body frame 1 where the engine 3 and the like exist on the right side of the body. Further, a dust-proof cover portion existing outside the radiator 7 is also used as a part of the side cover 9. The operation lever 62 extends so as to be exposed to the rear side of the dust-proof cover portion existing outside the radiator 7.
Therefore, the radiator cooling fan 70 can be reversely operated as required by gripping the operating lever 62 exposed to the rear side of the machine body and operating it to the reverse side. And it can return to the normal rotation state automatically by canceling the operation to the reverse side.

[Other Embodiment 1]
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.
Other configurations may be the same as those in the above-described embodiment.

[Second embodiment]
In the above embodiment, the traveling device 2 has a structure in which the front wheel 2F is a driving wheel constituted by non-steering wheels and the rear wheel 2R is constituted by steering wheels that are not driven. Not limited to, for example, the front wheel 2F is a steered wheel that is not driven, the rear wheel 2R is a drive wheel composed of a non-steer wheel, or both the front wheel 2F and the rear wheel 2R are composed of steered wheels, The front wheel 2F and the rear wheel 2R may be configured to be driven together.
Other configurations may be the same as those in the above-described embodiment.

[3 of another embodiment]
In the above embodiment, the front traveling unit is configured with the front wheel 2F including non-steering wheels, and the rear traveling unit is configured with the rear wheel 2R including steering wheels. The front traveling unit may be configured by a semi-crawler type crawler traveling device, and the rear traveling unit may be configured by a rear wheel 2R including steering wheels. 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.
In this case, the semi-crawler type crawler traveling device is driven, and the rear wheel 2R or the front wheel 2F constituted by the steered wheels may be non-driven. The rear wheel 2R or the front wheel 2F constituted by wheels may be driven together.
Other configurations may be the same as those in the above-described embodiment.

[4 of another embodiment]
In the above-described embodiment, the Glen tank 5 disposed above the threshing device 4 is configured to be tiltable around the swing axis z2 provided on one end side in the left-right direction, and the swing axis. Although the grain discharge port 5A that can be opened and closed is provided on the side where z2 is provided and the grain is discharged in the tilted posture, the structure is not limited to this. For example, the grain may be discharged by providing a drain auger (not shown) without providing the grain tank 5 with an openable / closable grain outlet 5A.
If constituted in this way, it is possible to discharge without providing the dump cylinder 53 for tilting the Glen tank 5, but by providing the dump cylinder 53, the grains existing at the bottom of the tank body 51 are discharged. It is desirable to arrange to gather to the side where the auger is located.
Other configurations may be the same as those in the above-described embodiment.

[5 of another embodiment]
In the above embodiment, the structure having the driving cabin 15 as the driving portion is exemplified in the above embodiment, but the present invention is not limited to this, and the driving portion is not provided with the driving cabin 15 and is simply provided. It may only be provided with a control unit or a driver's seat 15b.
Other configurations may be the same as those in the above-described embodiment.

[6 of another embodiment]
In the above embodiment, as a power transmission system from the engine 3 to the radiator cooling fan 70, the second output pulley 31a attached to the output shaft 31 of the engine 3, the relay input pulley 35a, the relay output pulleys 35b and 35c, the fan input pulley. Although the structure using 72 is shown, the output or input rotating body is not limited to a pulley, and may be a sprocket, for example.
In that case, a transmission chain may be used instead of the third transmission belt 34, the forward transmission belt 36, and the reverse transmission belt 37 in the endless rotation belt for transmission.
Other configurations may be the same as those in the above-described embodiment.

[7 of another embodiment]
In the above embodiment, a structure using the relay input pulley 35a fixed to the same relay shaft 35 and the relay output pulleys 35b and 35c as the driving rotating body in the power transmission system to the radiator cooling fan 70 is illustrated. However, the present invention is not limited thereto, and for example, the relay output pulleys 35b and 35c may be configured to be attached to different shafts and driven separately.
Other configurations may be the same as those in the above-described embodiment.

[8 of another embodiment]
In the above embodiment, the first tension ring body 63 acting on the forward transmission belt 36 of the forward rotation system power transmission mechanism and the second tension ring body 64 acting on the reverse transmission belt 37 of the reverse rotation system power transmission mechanism are provided. The structure supported by the single swing arm 60 is exemplified, but the structure is not limited to this.
For example, a structure in which a first tension ring body 63 and a second tension ring body 64 are separately provided using a plurality of swing arms 60 may be used.
Other configurations may be the same as those in the above-described embodiment.

[9 of another embodiment]
In the above-described embodiment, a structure in which the axis of the swing arm 60 and the axis of the fan input pulley 72 are configured to be the same axis p2 by using the common support shaft 71 is illustrated. However, it is not limited to this structure. For example, the swing arm 60 and the fan input pulley 72 may be supported by different support shafts and may have different shaft centers.
Other configurations may be the same as those in the above-described embodiment.

[10 of another embodiment]
In the above embodiment, the forward / reverse selection mechanism 6 is exemplified by the one provided with the coil spring 66 that urges the swing arm 60 of the forward rotation power transmission mechanism in a state in which the forward rotation transmission belt 36 is tensioned. However, it is not limited to this. For example, the coil spring 66 may not be used.
Further, the swing arm 60 may be configured to be fixed at both the forward rotation side and the reverse rotation side.
Other configurations may be the same as those in the above-described embodiment.

[11 of another embodiment]
In the above embodiment, the drive device for driving the radiator cooling fan 70 is exemplified by the structure using the power of the relay shaft 35 driven by the engine 3, but is not limited to this, for example, the engine 3 may be a driving device having a structure driven by using a power generation device driven by 3 and an electric motor.
Other configurations may be the same as those in the above-described embodiment.

[12 of another embodiment]
In the above-described embodiment, the radiator 7 is disposed at the vehicle body rear side portion of the engine 3 that is disposed with the output shaft 31 oriented in the left-right direction. Alternatively, the radiator 7 may be provided at a position on the front side of the vehicle body, or the radiator 7 may be provided at a position on the vehicle body upper side of the engine 3.
Other configurations may be the same as those in the above-described embodiment.

  The working machine to which the present invention is applied is not limited to various types of combines, and may be a lawnmower, a tractor, a construction machine, a transporter, or the like.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Traveling device 3 Engine 4 Threshing device 5 Glen tank 6 Forward / reverse selection mechanism 7 Radiator 9 Side cover 31 Output shaft 34A Driving side endless rotation zone 34B Endless rotation zone 35a, 35b, 35c of driving device Drive rotation Body 36 Endless rotation band of forward rotation power transmission mechanism 37 Endless rotation band of reverse rotation power transmission mechanism 60 Swing arm 62 Operation lever 63 First tension ring body 64 Second tension ring body 65 Ring body 66 Energizing mechanism 70 Radiator cooling fan 72 Input rotor p1 shaft center p2 shaft center L Virtual line segment

Claims (16)

With radiator,
A radiator cooling fan,
And a drive device for driving the radiator cooling fan based on the power of the engine,
The drive device has two systems of power transmission, a forward rotation power transmission mechanism capable of transmitting normal rotation power in an endless rotation band and a reverse rotation power transmission mechanism capable of transmitting reverse rotation power in another endless rotation band. Forward / reverse selection that is provided with a mechanism and that can selectively transmit power from one of the two power transmission mechanisms to the input rotor of the radiator cooling fan. all SANYO that mechanism is provided,
The forward / reverse selection mechanism selectively selects the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism to cause tension or relaxation. It is composed of a tension clutch that can be interrupted,
The forward / reverse selection mechanism includes a first tension ring body that acts on an endless rotation band of the forward rotation system power transmission mechanism, and a second tension wheel body that operates on an endless rotation band of the reverse rotation system power transmission mechanism. A working machine that is supported by a single swing arm .   The work machine according to claim 1, wherein an endless rotation band of the forward rotation power transmission mechanism and an endless rotation band of the reverse rotation power transmission mechanism are wound around the input rotating body.   The work machine according to claim 1 or 2, wherein the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism are wound around the same drive rotating body.   One of the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism is an outer peripheral surface of the endless rotation band with respect to the input rotating body. The working machine according to claim 3, wherein the working machine is wound so as to be in contact with the inner peripheral surface side, and is wound so as to be in contact with the other outer peripheral surface side.   The endless rotation band wound around both sides of the imaginary line segment connecting the axis of the drive rotator and the axis of the input rotator so as to be in contact with the input rotator on the outer peripheral surface side. In a state of being positioned on the inner peripheral surface side, a ring body is provided, and one or both of these ring bodies are wound so as to be in contact with the input rotating body on the outer peripheral surface side. The working machine according to claim 4, wherein the endless rotation belt is configured to be movable toward a tension or relaxation side.   The endless rotation band of the forward rotation type power transmission mechanism is wound so as to be in contact with the input rotating body on the inner peripheral surface side of the inner and outer peripheral surfaces. The working machine described in the section. The work machine according to claim 1, wherein the axis of the swing arm is the same axis as the axis of the input rotating body. The forward-reverse selection mechanism, according to any one of claims 1 to 7 the biasing mechanism in which is provided for biasing the forward system power transmission mechanism to the state of the endless rotating band is tensioned Working machine. The work machine according to any one of claims 1 to 8 , wherein the forward / reverse selection mechanism includes an operation lever capable of operating the swing arm. The work machine according to claim 9 , wherein the operation lever extends to a side opposite to a side where the engine exists. The working machine according to claim 9 or 10 , wherein a side lateral outer side of the engine is covered with a side cover, and the operation lever is provided in a state of being exposed to a side not covered with the side cover. . The operating lever is working machine according to any one of claims 9-11 which is connected to said oscillating arm. The work machine according to any one of claims 1 to 12 , wherein power from the engine is transmitted to the drive device. The drive rotator around which the endless rotation band of the forward rotation power transmission mechanism and the endless rotation band of the reverse rotation power transmission mechanism are wound is relay rotation in the power transmission system from the engine to the radiator cooling fan. The working machine according to claim 13 , wherein the working machine is configured to double as a body. The engine is deployed at a position on one side of the traveling vehicle body with the output shaft directed in the left-right direction, and is located at the rear side of the engine body, the front side of the engine body, or the upper side of the engine body. , the working machine of any one of claims 1-14, wherein the radiator is deployed. A drive rotator around which the endless rotation band of the forward rotation system power transmission mechanism and the endless rotation band of the reverse rotation system power transmission mechanism are wound is an endless rotation band of the drive device with respect to the radiator cooling fan, A plurality of winding portions that are stretched by a driving-side endless rotating band that transmits power from the engine are provided, and the driving-side endless rotating band is located on the outer side of the body from the endless rotating band of the driving device. working machine according to one or more of claims 1 to 15 that is configured to be positioned.

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