JP7301650B2 - Belt tension clutch device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt tension clutch device, and more particularly to a belt tension clutch device for interrupting power transmission of a winding transmission device used in agricultural work vehicles such as combine harvesters, tractors, and rice transplanters.

In an agricultural working vehicle, for example, a transmission belt is wound around a driving pulley driven by the engine and a driven pulley driving the working parts in order to transmit the power of the engine to each working part. Use a winding transmission for power transmission. In addition, a belt tension clutch device that functions as a simple clutch that disconnects the power by loosening the transmission belt of the winding transmission device and connects the power by tightening it may be employed.

In this belt tension clutch device, a clutch wire connected to a manual operation lever and a coil spring that applies an appropriate tension are used to actuate a tension roller in a tensioned state and a relaxed state of the transmission belt, thereby interrupting power. In recent years, in order to improve the operability, it has become common to use an electric motor unit instead of the manual operation lever to similarly operate the tension roller to make the transmission belt tensioned and loosened, thereby intermitting the power. (See Patent Document 1, for example).

However, if the electric motor unit operates the tension roller in the tension state and the slack state of the transmission belt in this way to switch the power, if the electric motor unit becomes inoperable due to a failure of the electric system, the power transmission will not be performed at all. There is a problem that it becomes impossible to drive the working unit. Therefore, in order to solve this problem, it is known to provide an operation means capable of mechanically connecting and disconnecting the tension roller by operating an operation lever in addition to the electric motor unit (for example, Patent Document 2 and Patent Document 2). 3).

Japanese Unexamined Patent Application Publication No. 2011-38588 JP-A-11-318191 JP-A-2000-60287

As described above, if the belt tension clutch device is provided with an operation means capable of mechanically connecting and disconnecting the tension roller by operating the operation lever in addition to the electric motor unit, the electric motor unit may become inoperable due to a failure of the electrical system. In the event of a fall, the operating portion can be driven by intermitting the power using the operating lever.

If the belt tension clutch device in this case is, for example, a grain discharge clutch device for a combine harvester, the discharge clutch is engaged by the operating lever, and the harvested grain stored in the grain tank is driven out of the machine by driving the discharge auger. discharge all to After that, the grain tank, which has been lightened by discharging the grains, is lifted by hand and rotated to expose the electric motor unit, which was surrounded by the grain tank, the engine, etc. and could not be accessed until then.

Furthermore, the exposed electric motor unit and the like are inspected, the failure of the electric system is repaired, and the clutch operation by the electric motor unit is restored. However, since the electric motor unit and the like are designed with durability in mind, the electric motor does not often break down, and only rarely breaks down due to exhaustion due to long-term use. Therefore, it is not a very good idea to increase the cost by providing an extensive operation system using an operation lever.

Therefore, even if an operation lever is added in preparation for the situation described above, it is necessary to simply add the operation lever based on the belt tension clutch device using the electric motor unit to reduce the cost. However, in the technology described in the preceding Patent Document 2, in addition to the electric grain discharge operation means for connecting and disconnecting the grain discharge clutch mechanism, this electric grain discharge operation means Regardless of the operating state of the grain discharge clutch mechanism, the grain discharge clutch mechanism is complicated because a mechanical grain discharge operation means is provided that can mechanically connect and disconnect the grain discharge clutch mechanism by operating the operation lever. As a result, cost increases cannot be avoided.

That is, in Patent Document 2, when the electric motor fails in the disconnected state, not only can the grain discharge clutch mechanism be put in the continuous state by operating the operation lever, but also when the electric motor fails in the continuous state, the grain discharge clutch mechanism can be put in the continuous state. Since the grain discharging clutch mechanism can be disengaged by operating the operating lever, one end of the outer portion of the grain discharging clutch mechanism is fixed alternatively to either the normal position or the abnormal position. In other words, a redundant configuration is adopted.

Moreover, it is necessary to access the one end of the outer in order to alternatively fix the one end of the outer to either the normal position or the non-normal position. However, if grains are stored in the grain tank and the grain tank cannot be rotated while being lifted by hand, it is difficult to access one end of the outer to switch the fixing.

In order to operate the grain discharge clutch mechanism by an electric motor, two parts of the inner are supported by the guide members, and the inner portion between the guide members is displaced in a direction intersecting the inner by the electric motor. One end of the outer must be displaced by a motor and the one end of the outer must be fixed manually, which complicates the overall structure and increases the cost. Furthermore, even with the technique described in the prior patent document 3, both the inner and the outer are displaced, and similarly the cost increase cannot be avoided.

Therefore, in view of the above problems, the present invention provides a control lever that can be used to intermittently switch power when an electric motor unit is inoperable due to a failure in an electrical system and cannot drive a working unit. To construct a belt tension clutch device capable of moving and driving a working part with a structure as simple and simple as possible at a low cost, while solving a new problem caused thereby. and

In order to solve the above-described problems, the belt tension clutch device of the present invention firstly comprises a transmission belt wound around a drive pulley and a driven pulley, a tension roller that applies tension to the transmission belt, and an inner wire. and an electric motor unit that actuates the transmission belt in a tensioned state and a slackened state via a clutch wire and a coil spring that gives an appropriate tension, and a tension roller that is actuated in a slackened state by the electric motor unit. A manual operation lever is provided to return the tension roller that has been actuated to the tensioned state or to the slack state, and the manual operation lever is the terminal of one end of the inner wire that is pulled by the actuating link of the electric motor unit and the coil spring. is similarly pulled to operate the tension roller connected to the terminal on the other end side of the inner wire in a tensioned state, and a blocking means is provided to eliminate interference with the pulling operation at the terminal on the one end side of the inner wire that occurs at this time. When the tension roller is actuated in a tensioned state by pulling the one end of the inner wire by means of the manual operation lever, the blocking means draws a regular trajectory of the actuating link that does not interfere with the operation. It is characterized by being constituted by a regulator that guides .

In the belt tension clutch device of the present invention , secondly, the regulating body constituting the blocking means is brought into contact with the surface of the coil portion of the coil spring so that the operating trajectory of the actuating link is a normal trajectory that does not interfere with the operation. It is characterized in that it is made with a regulation pin that guides so as to draw.

Thirdly , the belt tension clutch device of the present invention comprises a transmission belt wound around the driving pulley and the driven pulley, a tension roller for applying tension to the transmission belt, and the tension roller comprising an inner wire and an outer tube. An electric motor unit that actuates the transmission belt in a tensioned state and a slack state through a clutch wire and a coil spring that gives an appropriate tension; Alternatively, a manual operation lever is provided to return the tension roller, which has been actuated to the tension state by itself, to the relaxed state, and the manual operation lever similarly pulls the terminal on one end side of the inner wire pulled by the operating link of the electric motor unit and the coil spring. a blocking means is provided for operating the tension roller connected to the terminal on the other end side of the inner wire in a tensioned state and eliminating interference with the tensioning operation at the terminal on the one end side of the inner wire that occurs at this time, the blocking means comprising: When the manual operation lever is used to pull the terminal on one end side of the inner wire to operate the tension roller in a tensioned state, even if the operating locus of the operating link does not draw a normal locus, this is allowed to prevent operation interference. A passing space for the operating link to be eliminated is provided in the motor base of the electric motor unit .

According to the belt tension clutch device of the present invention, the transmission belt wound around the drive pulley and the driven pulley, the tension roller that applies tension to the transmission belt, and the clutch wire that constitutes the tension roller with an inner wire and an outer tube. and an electric motor unit that operates the transmission belt in a tensioned state and a relaxed state through a coil spring that gives an appropriate tension, and a tension roller that has been operated in a relaxed state by the electric motor unit. A manual operation lever is provided to return the tension roller, which has been actuated to a relaxed state, to a relaxed state. A tension roller connected to the terminal on the other end side is operated in a tensioned state, and a blocking means is provided on the operating link side or near the operating link to eliminate the interference of the pulling operation at the terminal on the one end side of the inner wire that occurs at this time. .

Therefore, when the electric motor unit becomes inoperable due to a failure in the electrical system and cannot drive the working part, the manual operation lever can be used to intermittently switch the power to drive the working part. To construct a clutch device with a simple and simple structure as much as possible at a low cost. In more detail, for example, a manual operation lever is newly added to the structure in which the electric motor unit described in Patent Document 1 is used to operate the tension roller between the tensioned state and the slackened state of the transmission belt to switch the power. Thus, the belt tension clutch device described above can be constructed.

In this case, the manual operation lever similarly pulls one end of the inner wire pulled by the actuating link of the originally provided electric motor unit and the coil spring, and moves the tension roller connected to the other end of the inner wire. Since it is operated in a tensioned state, there is no need to change the operation mode of the belt tension clutch using the electric motor unit. It can be carried out.

In addition, when the electric motor unit becomes inoperable due to a failure in the electrical system and cannot drive the working part, the manual operation lever is operated to pull one end of the inner wire pulled by the operating link of the electric motor unit and the coil spring. When the end of the inner wire is pulled, the operating system of the electric motor unit can be used as it is to operate the tension roller connected to the other end of the inner wire in a tensioned state to drive the working part. It is possible to easily respond to emergencies. Further, after that, the electric motor unit can be inspected, the electric system failure can be repaired, and the clutch operation by the electric motor unit can be restored.

In addition, if the electric motor unit becomes inoperable due to a failure in the electrical system and it is not possible to stop the driving of the working part, for example, check that all the grains have been discharged from the grain tank and restart the engine. is stopped, the grain tank can be rotated to expose the electric motor unit for inspection. Also, if the electric motor unit cannot be repaired on the spot, you can remove the transmission belt that wraps around the drive pulley and the driven pulley. , can be prepared for later repairs.

When the manual operation lever is simply attached to the belt tension clutch device in this way, when the terminal on the one end side of the inner wire is pulled by operating the manual operation lever, the coil spring is connected to the terminal on the one end side of the inner wire. are lifted at the same time, and one end (lower end) of the actuating link of the electric motor unit connected thereto rotates around a pivot point near the other end (upper end). Here, if the actuating link rotates to one side (clockwise) and escapes, there is nothing to hinder the rotation, and the tension roller can be actuated in a tensioned state without any problem, and the working part can drive.

However, when the actuating link rotates to the other side (counterclockwise) and escapes, the actuating link deviates from the range of the actuating trajectory when rotated by the electric motor unit and protrudes greatly outward. It abuts on the side wall of the motor base of the electric motor unit. When the actuating link comes into contact with the side wall of the motor base and its rotation is blocked, the terminal on the one end side of the inner wire cannot be pulled any further, and the tension roller can be operated in a tensioned state. I can't drive the working part because I can't do it.

Therefore, in consideration of the respective positions of the connection point with the coil spring before being pulled at the terminal on one end side of the inner wire, the connection point between the coil spring and the operating link, and the pivotal fulcrum of the operating link, the coil spring and the operating link should be considered. If the connection point of the link can be deviated to one side from the straight line joining the other points, the actuating link can always be rotated to one side without problems. However, since the inner wire is pulled toward the tension roller side (downward) by the tension roller's own weight and the biasing force of the return spring, these connection points and pivot points are always aligned in a straight line. As described above, only the connecting point between the coil spring and the operating link cannot be removed to one side.

On the other hand, if the side wall of the motor base of the electric motor unit is expanded outward so that the actuating link does not come into contact with it, the rigidity of the motor base will decrease, and the cover that covers the electric motor unit will need to be enlarged. Since the weight including the cover is increased and the installation space for these electric motor units is also required to be considerably large, the belt tension clutch device cannot be made compact.

Therefore, in the present invention, a blocking means is provided on the operating link side or near the operating link to eliminate interference with the pulling operation at the one end side end of the inner wire that occurs when the one end side end of the inner wire is pulled by the manual operation lever. Therefore, the tension roller can be reliably operated in a tensioned state by the blocking means when the manual operation lever is operated, so that the above-mentioned problem can be solved and the belt tension clutch device can be made compact.

Further, when the tension roller is actuated in a tensioned state by pulling the one end of the inner wire with the manual operation lever, the blocking means draws a normal trajectory of the actuating link that does not interfere with the operation. It consists of a regulatory body that leads to Further, the regulating body constituting the blocking means is a regulating pin that abuts on the surface of the coil portion of the coil spring and guides the actuating link so that the actuating link draws a regular trajectory that does not interfere with the operation.

When the blocking means is constituted by the regulating body in this way, the position of the connecting point and the fulcrum of rotation can be removed from the alignment by the regulating body, and the terminal on the one end side of the inner wire is pulled by the manual operation lever. When the tension roller is actuated in a tensioned state, the actuating link can be guided to draw a normal trajectory that does not interfere with the operation, for example, rotates clockwise. Further, if such a restricting body is used as a restricting pin, and the restricting pin comes into contact with the surface of the coil portion of the coil spring and guides the operating locus of the actuating link so as to draw a normal locus that does not interfere with the operation, the restricting pin is simply Since it is sufficient to simply provide the , there is no need for a significant increase in cost.

On the other hand, the blocking means is provided even when the operation locus of the actuating link does not draw a normal locus when the tension roller is actuated in a tensioned state by pulling the terminal on the one end side of the inner wire by means of the manual operation lever. If the motor base of the electric motor unit is provided with a passage space for the actuating link, which allows the operation to be blocked, the passage space for the actuating link can be formed in the side wall or the cover without particularly extending the side wall of the motor base outward. Since it is sufficient to provide a notch portion or an opening, the above-mentioned new problem can be solved very easily.

It is a side view of a combine to which the belt tension clutch device of the present invention is applied. It is a top view of a combine. It is a front view of a grain tank. It is a front view of a belt tension clutch. 4 is an exploded view of an electric motor unit and a tension roller; FIG. FIG. 5 is an explanatory diagram of a clutch operation state by an electric motor unit; FIG. 4 is a perspective view showing a linkage relationship between a clutch wire and a manual operation lever; FIG. 4 is an explanatory diagram of a clutch operation state by a manual operation lever; FIG. 4 is an explanatory diagram of obstructing clutch operation by a manual operation lever; FIG. 4 is a perspective view of a main part showing an operation environment of a manual operation lever;

An embodiment of the present invention will be described based on the drawings. As shown in FIGS. 1 to 3, a combine harvester 1, which is an agricultural work vehicle, harvests rice and wheat, threshs and sorts them, temporarily stores the harvested grains in a grain tank, and then stores the grains in a grain tank. When the tank is full of grains, the harvesting work is performed by driving the discharge auger and discharging the grains into a container or the like installed on the bed of the truck. For this reason, the combine harvester 1 is provided with a control section 5 having a driver's seat and covered with a cabin 4 at the front right portion of a machine body frame (machine body) 3 having left and right crawler type traveling devices 2 at its lower part.

Also, a reaping unit 6 is provided vertically from the left front portion of the body frame 3 to the front of the control unit 5 by a hydraulic cylinder (not shown). Further, a threshing section 7 is provided behind the harvesting section 6 and a grain tank 8 and a discharge auger 9 are provided on the right side of the threshing section 7 . A disc type cutter 10 is provided behind the threshing part 7 and the grain tank 8.例文帳に追加An engine cover 12 is provided to cover a driving unit 11 including an engine and the like from the lower part of the rear portion of the control unit 5 to the front of the grain tank 8 .

The reaper 6 divides the standing grain culms in the field into harvested grain culms and uncut grain culms by means of a dividing member 13 and a narrow guide 14 provided at the lower front end of the reaping unit 6 . The harvested culms that have entered are pulled up by a raising device 15, and then the roots of the grain culms are cut by a cutting blade 17 while being raking in by a raking device 16.例文帳に追加Furthermore, the culms that have been raked rearward by the raking device 16 are joined by the left and right raked-in conveying chains and the tip-conveying chains that constitute the lifting and conveying device. The grains are conveyed to the threshing section 7 while adjusting the threshing depth by 18 .

The threshing section 7 has a substantially box-shaped machine frame below the cylinder cover 19 covering the upper part, and a threshing chamber is formed in the upper part of the machine frame. This threshing chamber has a threshing feed chain 20 for nipping and conveying the grain culms conveyed from the reaper 6 along the threshing opening, a clamping rail provided on the cylinder cover 19, and a large number of threshing teeth planted around the threshing feed chain 20. A handling cylinder and a receiving net are provided. In addition, a processing chamber for processing straw waste mixed with grains that could not be threshed in the threshing chamber is provided in parallel from the rear tip side of the first threshing drum toward the rear of the machine. A second handling shell and a receiving net are provided. Furthermore, below the first and second handling cylinders, there is provided a sorting chamber consisting of a swing sorting body for sorting out grains and the like that have leaked from the receiving net, a sorting air passage, and the like.

The grains threshed and sorted in the threshing section 7 are transferred upward by the grain-lifting spiral provided in the grain-lifting cylinder 21 and discharged into the grain tank 8. The grain tank 8 temporarily stores the grains. and then discharged to a container or the like outside the machine by a discharge auger 9. In addition, the culms discharged from the threshing chamber after the threshing process is completed are conveyed toward the disk-shaped cutter 10, and the disc-shaped cutter 10 shreds the conveyed culms and uses them as straw on the reaped land. discharge.

The engine provided in the driving section 11 serves as a power source for driving each section including the traveling device 2, and serves as a power source for the grain discharging device to which the belt tension clutch device of the present invention is applied. Therefore, the configuration of the grain tank 8 and the discharge auger 9 together with the power transmission system of the grain discharging device will be described. 22, and then a drive pulley 24 provided on a drive shaft 23 pivotally supported on the counter case 22 is rotated.

The grain tank 8 includes an upper storing portion 25 formed in a substantially rectangular parallelepiped shape by a front wall 25a, a rear wall 25b, a right side wall 25c, a left side wall 25d, and a ceiling wall 25e. A lower gutter portion 26 formed in a funnel shape by a front wall 26a, a rear wall 26b and left and right inclined bottom walls 26c and 26d is integrally connected to constitute a box-shaped tank for storing grains. The grain tank 8 has a horizontal spiral 27 extending in the front-rear direction at the bottom of the gutter 26, and the front side of the horizontal spiral 27 is pivotally supported by a bracket 28 attached to the front wall 26a via a bearing. A driven pulley 29 is attached to the front end of the lateral spiral 27 .

Further, a tension roller 31 for applying tension to the transmission belt 30 by winding the V-shaped transmission belt 30 over the driving pulley 24 and the driven pulley 29 is provided below the transmission belt 30 . The tension roller 31 is constructed by providing a roller 31b rotatably attached to the tip of an arm 31a rotatably attached to a pin provided on the bracket 28 via a bearing. A tension coil spring 32 for returning the tension roller 31 away from the transmission belt 30 is provided between .

One end (lower end) of the inner wire 33a is attached to a pin provided in the longitudinally intermediate portion of the arm 31a. Install with a washer and split pin to prevent it from coming off. The end of the outer tube 33b that covers the inner wire 33a is attached to the top of the bracket 28. As shown in FIG. The inner wire 33a and the outer tube 33b constitute a clutch wire 33 for discharging grains. A guide 35 for the transmission belt 30 is provided on the bracket 28, and a guide 36 is provided on the driving pulley 24 side.

On the other hand, the rear side of the horizontal spiral 27 is pivotally supported by a first gear case 37 provided behind the rear wall 26b. towards the longitudinal helix which is supported by the Further, the vertical spiral of the discharge auger 9 is coupled with the horizontal spiral 27 by a bevel gear to rotate, and the grain sent from the horizontal spiral 27 is sent toward the upper side of the vertical spiral. The vertical helix is housed in a vertical pipe 38 rotatably supported on the body frame 3, and discharges the grains out of the machine through the second and third vertical helices connected to the upper end of the vertical helix. .

A second gear case 39 is provided on the upper portion of the vertical pipe 38, and the second vertical spiral is installed in the second gear case 39. As shown in FIG. Further, the second gear case 39 supports a second vertical pipe 40 by a hydraulic cylinder 41 so that it can be raised and lowered, and the second vertical pipe 40 has a third vertical spiral inside. Further, the vertical pipe 38 can be turned around the vertical helical shaft together with the second gear case 39 and the second vertical pipe 40 by an electric motor.

The grain tank 8 has a rear wall 26b of the gutter portion 26 attached to the first gear case 37, and a rear wall 25b of the storage portion 25 rotatably attached to the vertical pipe 38. Further, the first gear case 37 and the vertical pipe Since 38 is attached to the body frame 3 so as to be rotatable about the vertical spiral shaft, the grain tank 8 as a whole can be rotated outwardly of the body about the vertical helical shaft on the rear side. When rotating the grain tank 8, the rear cover 42 of the grain tank 8 is opened and the lower covers 43 and 44 are removed with the grains discharged and the grain tank 8 emptied.

In addition, after removing the transmission belt 30 wound over the drive pulley 24 and the driven pulley 29, a lock device provided between the grain tank 8 and the grain hoisting cylinder 21 is operated by operating a tank fixing lever (not shown). Further, the tank rotating lever 45 provided on the bracket 28 is lifted up to lower the roller 46 onto the bottom plate of the machine frame 3. When the tank rotating lever 45 is lifted and pulled, the grain tank 8 is shown in FIG. It can be made to the maintenance position by largely rotating it toward the outside of the machine body indicated by the chain double-dashed line about the vertical helical axis from the grain storage position.

When the grain tank 8 is rotated to the maintenance position, the front surface of the grain tank 8 is exposed, and the rear side of the driving portion 11 and the right side of the threshing portion 7 are released, so that maintenance of the engine and the like and the threshing portion 7 can be performed. In addition, maintenance of the transmission part of the grain discharging device and the belt tension clutch device of the grain discharging device can be performed.

The configuration of the grain tank 8 and discharge auger 9 together with the power transmission system of the grain discharging device has been described above. Next, the belt tension clutch device of the grain discharging device will be described as shown in FIGS. A motor base 48 of an electric motor unit is attached via a rectangular mounting plate 47 to the front wall 25a of the grain tank 8 near the upper portion thereof. Further, the motor base 48 is provided with a reduction gear 51 and a limit switch 52 which are integrally provided with an electric motor 49 constituted by a geared motor and an operating arm 50 .

The output gear 49 a of the electric motor 49 meshes with the reduction gear 51 , and accordingly the actuating arm 50 rotates about the mounting shaft 48 a of the motor base 48 that supports the reduction gear 51 . A pin 50a provided at the tip of the actuating arm 50 is fitted into an arc-shaped elongated hole 48b formed in the motor base 48 so as to protrude. Therefore, the pin 50a moves along the long hole 48b in accordance with the forward and reverse rotation of the electric motor 49, and when the pin 50a abuts against both edges of the long hole 48b, both edges of the long hole 48b act as stoppers. As a result, the rotation range of the operating arm 50 is restricted.

Furthermore, a limit switch 52, whose actuator is operated by a pin 50a protruding from the long hole 48b, is designed to detect that the pin 50a reaches the lower end edge of the long hole 48b. attached to the motor base 48 near the edge of the Also, the pin 50a of the operating arm 50 protrudes to the side opposite to the side where it fits into the long hole 48b, and the pin 50a on this side is provided with the upper end of the operating link 53 curved in a C shape near the upper end. It is rotatably mounted through a hole 53a.

Further, an electric motor unit U is constructed by attaching a cover A surrounding the motor base 48 to protect the electric motor 49, reduction gear 51, limit switch 52, operating link 53, etc. from dust, wind and rain. One hook portion 54a of the tension coil spring 54 is engaged with the hole 53b provided near the lower end of the operating link 53 of the electric motor unit U, and the other hook portion 54b of the tension coil spring 54 is engaged with the hole 53b. The other end (upper end) of the inner wire 33a is engaged with and connected to an eye end 34 which is a terminal.

The other end (upper end) of the outer tube 33b having the threaded portion 33c passes through the threaded portion 33c through the mounting hole 47a provided in the lower portion of the mounting plate 47, and the position thereof can be freely adjusted to the lower portion of the mounting plate 47 by the upper and lower nuts. Install. Therefore, as shown in FIG. 6, the electric motor 49 is reversely rotated, the pin 50a of the operating arm 50 is turned on by the limit switch 52, and the electric motor 49 stops rotating. The transmission belt 30 is pulled downward by its own weight and the urging force of the tension coil spring 32 to disengage the clutch, that is, to loosen the transmission belt 30 .

6, the pin 50a of the operating arm 50 abuts against the upper edge of the long hole 48b and the electric motor 49 stops rotating. is pulled upward by the electric motor unit U, that is, the transmission belt 30 is in a tensioned state. Position c1 of the pin 50a of the operating arm 50, position c2 of the upper hook portion 54a of the coil spring 54, position c3 of the eye end 34 at the upper end of the inner wire 33a, and position c3 of the inner wire 33a. The outlet position c4 from the screw portion 33c at the upper end of the outer tube 33b near the upper end is aligned, and from this straight line, the center position p of the mounting shaft 48a that supports the reduction gear 51 serving as the rotation center of the operating arm 50 is detected. is biased to the right.

Therefore, by aligning this straight line with the direction of the upper portion of the inner wire 33a covered by the outer tube 33b, the frictional resistance at the threaded portion 33c at the upper end of the outer tube 33b in the engaged state of the clutch where the tensile load is approximately maximum. can be reduced. Further, the position of the pin 50a of the operating arm 50 is such that when the clutch is switched from the disengaged state to the engaged state, the pin 50a of the operating arm 50 becomes longer than the fulcrum with respect to the rotation center p of the operating arm 50. The engaged state of the clutch abutting against the upper edge of the hole 48b is maintained. Therefore, it is not necessary to provide the electric motor 49 with a strong brake device for stopping rotation.

The actuating link 53 is curved in a C shape so as not to interfere with the mounting shaft 48a that supports the reduction gear 51 from the disengaged state to the engaged state of the clutch. may be omitted and the hook portion 54a on the upper side of the coil spring 54 may be directly coupled to the pin 50a of the operating arm 50. However, if such a structure is provided, the coil spring 54 itself will interfere with the mounting shaft 48a and the like as long as the same fulcrum overpass structure is provided. Even if this problem can be prevented, the belt tension clutch device cannot be made compact.

Further, the coil spring 54 described above is provided in order to apply an appropriate tension to the transmission belt 30 even when the transmission belt 30 is slightly stretched when the clutch is engaged. It may be provided between the eye end 34 provided at the lower end of the inner wire 33 a and the pin provided at the intermediate portion of the arm 31 a of the tension roller 31 . However, if the coil spring 54 is provided in such a manner, the coil spring 54 interferes with the transmission belt 30 and the like, which is undesirable. I can't

Furthermore, when the tension roller 31 is actuated by the electric motor unit U so that the transmission belt 30 is in a tension state and a slack state, and the harvested grains temporarily stored in the grain tank 8 are discharged to a container or the like outside the machine. is carried out by remotely operating the grain discharging device using an auger operating remote controller provided in the control unit 5 . More specifically, when the grain discharge switch of the auger operation remote control is pressed, an electronic control unit (not shown) for working machine control connected to the auger operation remote control switches the discharge clutch motor relay to rotate the electric motor 49 forward.

As a result, the transmission belt 30 is in a tensioned state, and the grains stored in the grain tank 8 can be discharged out of the machine through the discharge port 40a provided at the tip of the vertical pipe 40 by the horizontal spiral 27 and the vertical spiral. When the grain discharge switch is pressed again, the electronic control unit switches the discharge clutch motor relay to reversely rotate the electric motor 49, thereby relaxing the transmission belt 30 and stopping grain discharge. In addition to the grain discharge switch, the auger operation remote controller has a discharge auger operation switch for turning the discharge auger 9 left and right or moving it up and down, a discharge auger automatic turning switch, or an auger flap operation switch for changing the grain discharge direction. prepare.

The belt tension clutch device for switching the power by operating the tension roller 31 between the tensioned state and the slackened state of the transmission belt 30 by the electric motor unit U has been described above. In addition, even if the electric motor unit U falls into an inoperable state due to a failure in the electric system and cannot drive the working part, the power can be switched on and off using the manual operation lever to drive the working part. Embodiments that enable this are described.

First, the newly added manual operation lever 55 is rotatably attached at its base to a mounting shaft 47b provided so as to protrude from the lower right side of the mounting plate 47 as shown in FIGS. The action portion S provided near the lower tip of the L-shaped manual operation lever 55 is formed by a plate 55b welded to face the lever body 55a so as to provide a gap therebetween. The action portion S of the manual operation lever 55 is formed by confining the inner wire 33a pulled out from the screw portion 33c at the upper end of the outer tube 33b in a gap provided on the tip side thereof, and attaching a bolt b to the tip portion of the gap. Close the tip of the gap (see FIG. 7).

This gap is narrower than the diameter of the eye end 34 provided at the upper end of the inner wire 33a and wider than the wire diameter of the inner wire 33a. , the inner wire 33a can freely pass through without hindering its movement (see FIG. 6). However, when the manual operation lever 55 is rotated clockwise around the mounting shaft 47b to lift the operating portion S upward, the operating portion S comes into contact with the lower portion of the eye end 34, and then the eye end 34 is moved. The inner wire 33a is pulled upward through the inner wire 33a (see FIG. 8).

Therefore, since the tension roller 31 makes the transmission belt 30 in a tension state, the manual operation lever 55 can be used to discharge the grains stored in the grain tank 8 to the outside of the machine. When the grain discharge is to be stopped, the inner wire 33a is pulled back when the manual operation lever 55 is released or rotated counterclockwise, so that the transmission belt 30 is loosened and power transmission is interrupted. Dripping can stop the ejection of grain.

When the manual operation lever 55 is not used, the notch 55c provided near the tip of the manual operation lever 55 is fitted into the bolt 56 welded to the upper right portion of the mounting plate 47, and the mounting plate 47 is secured with a washer and a nut. be tightened. Therefore, when using the manual operation lever 55, it is sufficient to loosen the nut, thereby eliminating the problem of losing the bolt to be inserted and fixed as in the case of fixing the manual operation lever 55 by inserting a bolt. be able to.

As described above, the manual operation lever 55 (see FIG. 10) provided between the control unit 5 and the grain tank 8 can be used to switch the power. is rotated to lift the action portion S upward, the coil spring 54 linked to the eye end 34 and the operating link 53 are also lifted upward at the same time. In this case, if the electric motor unit U is in an inoperable state and the operating arm 53 is stopped at, for example, the disengaged position of the clutch, as shown in FIG. If it falls to the left (if the operating link 53 rotates clockwise) with the rotation operation of , there is no problem.

However, when the coil spring 54 and the operating link 53 fall to the right (when the operating link 53 rotates counterclockwise) as shown in FIG. As a result, the coil spring 54 and the actuating link 53 lose their escape, which causes a problem that the operating portion S of the manual operating lever 55 cannot be operated to the position where the clutch is engaged. Problems in the tilting direction or rotating direction of the coil spring 54 and the operating link 53 change depending on the arrangement position of the electric motor unit U with respect to the motor base 48. For example, the electric motor unit U may be attached to the motor base 48 shown in On the other hand, if it is provided from the left side to the right side, which is bilaterally symmetrical, the tilting direction or the rotating direction of each can be explained as the opposite problem of the above.

Therefore, in order to solve this problem, the connection point c5 between the eye end 34 and the coil spring 54 before pulling the terminal on the one end side of the inner wire 33a shown in FIG. Considering the respective positions of the connecting point c6 of the operating link 53 and the pivot point c7 of the operating link 53, the connecting point c6 of the coil spring 54 and the operating link 53 is separated from the straight line connecting the other points c5 and c7. If it can be disengaged to one side (left or right), the actuating link 53 can always be rotated clockwise (or counterclockwise) without problems. However, since the inner wire 33a is pulled toward the tension roller 31 (downward) by the weight of the tension roller 31 and the urging force of the coil spring 32 that returns the clutch to the disengagement side, these connection points c5 and c6 and the rotation The dynamic fulcrum c7 is always aligned on a straight line, and only the connecting point c6 cannot be disengaged to one side.

On the other hand, if the side wall 48c of the motor base 48 of the electric motor unit U is expanded outward so that the actuating link 53 does not come into contact with it, the rigidity of the motor base 48 is reduced and the cover that covers the electric motor unit U is removed. A is also required to be increased, the weight of the cover A is increased, and the installation space for the electric motor unit U is also required to be considerably large.

Therefore, as a first embodiment for solving this problem, a regulation pin 57 is newly welded to the center of the mounting plate 47 and protruded. The regulating pin 57 made of a round bar abuts against the surface of the coil portion of the coil spring 54 and guides the actuating link 53 to follow a regular trajectory that does not interfere with the operation. More specifically, when the electric motor unit U is in an inoperable state as shown in FIG. is located on the right side (or left side) near the top of the coil spring 54, and is provided close to the surface of the coil portion of the coil spring 54 to the extent that it slightly contacts or does not contact.

In this state, when the manual operation lever 55 is rotated to lift the action portion S upward, the coil spring 54 linked to the eye end 34 is also lifted upward. When the point c6 tries to move to the right (or left), the reaction force due to the contact between the regulating pin 57 and the coil portion causes the connection point c6 to move back to the left (or right). of the actuating trajectory k of the connecting point c6 centering on the fulcrum c7, follows a normal clockwise (or counterclockwise) trajectory that does not interfere with the operation.

In the above-described first embodiment, when the manual operation lever 55 is used to pull the terminal on the one end side of the inner wire 33a to operate the tension roller 31 in a tensioned state, the operation locus k of the operation link 53 is disturbed. The regulating pin 57 acting on the coil spring 54 provided near the operating link 53 is used to guide the actuating link 53 so as to draw a regular trajectory that does not generate For example, a regulating spring 58 is provided between the connecting point c6 of the actuating link 53 and the motor base 47, and the urging force of the regulating spring 58 is applied directly to the actuating link 53 side so that the actuating link 53 draws a regular trajectory. may be set in the

Furthermore, in the above embodiment, when the terminal on one end of the inner wire 33a is pulled by the manual operation lever 55, and the tension roller 31 connected to the terminal on the other end of the inner wire 33a is operated in a tensioned state. The restriction bodies 57, 58 on the side of the operating link 53 or near the operating link 53 are provided to eliminate the obstruction of the pulling operation at the terminal on the one end side of the inner wire 33a. However, as a blocking means for eliminating the obstruction of this pulling operation, even if the actuation locus of the actuation link 53 does not draw a normal locus, the passage space of the actuation link 53 is allowed to eliminate the actuation obstruction. It can also be provided in the motor base 48 of the electric motor unit U on the side.

That is, as shown in FIG. 7, if a notch portion 48d or an opening is formed in the side wall 48c of the motor base 48 so that the central portion of the operating link 53 passes through and the operating link 53 does not draw a regular operating locus, The operation link 53 can be configured so as not to protrude outside the motor base 48 through the notch 48 d or the opening and interfere with the pulling operation of the inner wire 33 a by the manual operation lever 55 . In this case, the side wall 48c of the motor base 48 is not expanded outward, so the belt tension clutch device can be made compact. Although the belt tension clutch device has been applied to the grain discharging device of the combine harvester 1, it is not limited to this and can be easily applied to any device having similar problems. is not limited to

1 Combine 24 Driving Pulley 29 Driven Pulley 30 Transmission Belt 31 Tension Roller 33 Clutch Wire 48 Motor Base 49 Electric Motor 50 Actuating Arm 53 Actuating Link 54 Coil Spring 55 Manual Operation Lever 57 Regulating Pin (Blocking Means)
48d notch (passage space)
U Electric motor unit

Claims (3)

Through a transmission belt wound around the drive pulley and the driven pulley, a tension roller that applies tension to the transmission belt, a clutch wire that constitutes the tension roller with an inner wire and an outer tube, and a coil spring that applies an appropriate tension. An electric motor unit that actuates a transmission belt in a tensioned state and a slack state, and a tension roller that has been actuated in a slack state by the electric motor unit is actuated in a tensed state, or the tension roller that has been actuated in a tensed state by itself is slackened. A manual operating lever for returning is provided, and the manual operating lever similarly pulls the terminal on one end of the inner wire pulled by the actuating link of the electric motor unit and the coil spring, and connects it to the terminal on the other end of the inner wire. is actuated in a tensioned state, and blocking means is provided for eliminating interference with the pulling operation of the terminal on the one end side of the inner wire that occurs at this time. A belt tension clutch device comprising a regulating body that guides the operating link so as to draw a normal locus that does not interfere with the operation when the tension roller is actuated in a tensioned state. 3. The restricting body constituting said blocking means is a restricting pin that abuts on the surface of the coil portion of the coil spring and guides the operating link so as to draw a normal path that does not interfere with the operation of the operating link. 2. The belt tension clutch device according to 1 . Through a transmission belt wound around the drive pulley and the driven pulley, a tension roller that applies tension to the transmission belt, a clutch wire that constitutes the tension roller with an inner wire and an outer tube, and a coil spring that applies an appropriate tension. An electric motor unit that actuates a transmission belt in a tensioned state and a slack state, and a tension roller that has been actuated in a slack state by the electric motor unit is actuated in a tensed state, or the tension roller that has been actuated in a tensed state by itself is slackened. A manual operating lever for returning is provided, and the manual operating lever similarly pulls the terminal on one end of the inner wire pulled by the actuating link of the electric motor unit and the coil spring, and connects it to the terminal on the other end of the inner wire. is actuated in a tensioned state, and blocking means is provided for eliminating interference with the pulling operation at one end of the inner wire that occurs at this time, the blocking means pulling the one end of the inner wire by means of a manual operation lever. When the tension roller is actuated in a tensioned state, the motor base of the electric motor unit is provided with a passage space for the actuating link, which allows even if the actuating link does not draw a normal trajectory and eliminates operation obstruction. A belt tension clutch device comprising :

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