JP2018000198A - Agricultural machine transmission and agricultural machine - Google Patents

Abstract

A transmission device for an agricultural machine with high cooling efficiency is provided. SOLUTION: A three-point link hitch mechanism 2, a transmission gearbox 3 receiving power from a PTO shaft of a tractor, a rotary working unit 4 having a tilling blade 12 mounted on a shaft periphery of a rotating shaft 11 extending in a horizontal direction, The transmission gear box 3 has a drive shaft 17 and a driven shaft 18, and change gears 191 and 192 are provided on the rear end sides of the drive shaft 17 and the driven shaft 18 so as to be replaceable. In an agricultural machine that transmits power to the shaft 18 to perform tillage work or mowing work, the oil agitating member 26 attached to the drive shaft 17 or the driven shaft 18 and oil that forms a space for accommodating oil together with the transmission gear box 3 A support case 5 for stirring and cooling, and a heat dissipating fin 6 provided on the outer surface of the support case 5 are provided. [Selection] Figure 1

Description

  The present invention relates to a transmission for a farm work machine and a farm work machine.

  Conventionally, for example, an agricultural machine that performs a tilling work or a mowing work by rotating a rotary working part forward / reversely can easily switch power transmission from a drive shaft to a driven shaft. A drive shaft that receives power from the PTO shaft and a driven shaft are juxtaposed in the front-rear direction, and a change gear can be inserted and replaced on the rear end side of both shafts. The gear width of the change gear from the rear end side of both shafts An idle gear is provided on the front side, and power is transmitted from the drive shaft to the driven shaft via the idle gear, or the change gear is replaced and both change gears are directly meshed to transmit power from the drive shaft to the driven shaft. There was a transmission for an agricultural machine (see claim 1, [0004] to [0005] of Patent Document 1, FIGS. 1 to 6).

JP 2000-287504 A

  For the purpose of improving work efficiency, there has been a demand for cooling the mission oil that is heated when using a conventional transmission for a farm machine.

  Therefore, the problem to be solved by the present invention is to provide a transmission for a farm machine with high cooling efficiency.

  As means for solving the above-mentioned problems, a transmission for a farm machine according to the present invention includes a three-point link hitch mechanism connected to the rear portion of a tractor, a transmission gearbox that receives power from the PTO shaft of the tractor, and a horizontal direction. A rotary working unit on which a plurality of tillage blades or mowing blades are mounted on the circumference of the rotating shaft extending to the drive shaft, and the transmission gearbox is arranged in parallel with the drive shaft that receives power from the PTO shaft of the tractor, and the drive shaft And a change gear can be inserted and replaced on the rear end side of the drive shaft and the driven shaft. Power is transmitted from the drive shaft to the driven shaft via the change gear, via a three-point link hitch mechanism. In an agricultural machine that is connected so as to be able to move up and down and performs tillage work or mowing work, it is provided on the side opposite to the driven shaft of the transmission gear box and the oil stirring member attached to the drive shaft or driven shaft. Comprising a support case for oil agitation cooled to form a space for accommodating the oil with gear box, and fins for heat dissipation provided on the outer surface of the support case, the.

  In the transmission of the agricultural machine according to the present invention, a cover for inserting and replacing at least one of the change gear, another change gear having a different number of teeth, and an idle gear is preferably provided on the rear surface of the transmission gear box.

  Further, in the transmission of the agricultural machine according to the present invention, a part of the transmission shaft to which power is transmitted from the driven shaft is inserted into the transmission gear box, and the transmission shaft, the driven shaft, and the drive shaft are included in the transmission gear box. It is preferable that the support case is provided on the side opposite to the side where the driven shaft and the transmission shaft are provided.

  In the transmission of the agricultural machine according to the present invention, it is preferable that the oil level is positioned below the drive shaft and the driven shaft at the time of standing.

  Furthermore, in the transmission of the agricultural machine according to the present invention, it is preferable that the oil stirring member stirs the oil in a direction from the transmission gear box toward the support case.

  According to the present invention, the oil in the transmission gear box is agitated by the oil agitating member, and the fins are provided on the outer periphery of the support case. Therefore, it is possible to provide a transmission device for an agricultural machine with high cooling efficiency.

FIG. 1 is a rear view showing an embodiment of a transmission device for an agricultural machine according to the present invention. FIG. 2 is a plan view of FIG. 3 is a cross-sectional view of the transmission gear box and the support case shown in FIG. 4 is a cross-sectional view taken along the line XX in FIG. FIG. 5 is a schematic view taken along the line YY in FIG.

  An embodiment of a transmission device for agricultural machinery according to the present invention will be described with reference to the drawings. In the following explanation, the forward direction of the tractor to which the agricultural machine to which the transmission of the agricultural machine according to the present invention is attached is connected is defined as the forward direction, and the backward direction is defined as the backward direction. Moreover, let the direction parallel to the field scene which this tractor plows be a horizontal direction. Furthermore, let the direction perpendicular | vertical with respect to a farm scene be an up-down direction.

  The transmission for a farm working machine according to the present invention can be applied to a transmission attached to a rotary working machine connected to the rear part of a tractor, for example, in order to perform tillage work or mowing work. The rotary work machine 1 is shown in FIGS. 1 and 2 as an example of a part to which one embodiment of the transmission device for a farm work machine according to the present invention can be applied. FIG. 1 is a rear view of the rotary working machine 1 as viewed from the rear side. FIG. 2 is a plan view of the same. 1 and 2 do not show a power transmission shaft (universal joint) for transmitting power from the PTO shaft of the tractor. In FIG. 2, the outline of the rear part of the tractor T is indicated by a broken line.

  As shown in FIG. 1, the rotary work machine 1 includes a three-point link hitch mechanism 2, a transmission (transmission gear box 3), a support frame 7, a transmission frame 8, a side frame 9, and a chain transmission unit. (Chain transmission case 10), a shield cover 13, a rear cover 14, and a rotary working unit 4 are provided.

  The three-point link hitch mechanism 2 is a connection portion between the rotary work machine 1 and the rear part of the tractor. The three-point link hitch mechanism 2 has one top link connecting portion 201 on the upper side and two lower link connecting portions 202 on the lower side. Since the top link connecting portion 201 and the lower link connecting portion 202 are detachably connected to the tractor T (see FIG. 2), the rotary work machine 1 is detachable via the three-point link hitch mechanism 2. Yes. Further, the entire rotary work machine 1 can be moved up and down by the three-point link hitch mechanism 2. The three-point link hitch mechanism 2 is an example of a three-point link hitch mechanism in the transmission of the agricultural machine according to the present invention.

  The transmission gearbox 3 is a member that receives power from the PTO shaft of the tractor. The transmission gearbox 3 can transmit the power received from the PTO shaft of the tractor to a transmission shaft 19 that is inserted into a transmission frame 8 described later. The transmission gear box 3 is provided with a support case 5 on the right side in the forward direction of the tractor. Further, a heat radiating fin 6 is provided on the outer periphery of the cylindrical support case 5. The internal structures of the transmission gear box 3 and the support case 5 and the fins 6 will be described later with reference to FIGS. The transmission gear box 3 is an example of a transmission gear box in the transmission of the agricultural machine according to the present invention.

  One end of the support case 5 is attached to the transmission gearbox 3, and the other end is attached to a support frame 7 extending in the horizontal direction. A transmission frame 8 extending in the horizontal direction is attached to the other end of the transmission gear box 3 having the support case 5 attached to one end. The transmission frame 8 is a cylindrical member and has a double structure in which a transmission shaft 19 that is rotatable about its axis is inserted. The transmission shaft 19 is a member that transmits the motive power transmitted from the tractor to the chain transmission section by an appropriate combination of gears in the transmission gear box 3. The support frame 7 and the transmission frame 8 are arranged so as to coincide with each other when the respective axes are extended. Further, the support frame 7 and the transmission frame 8 function as an upper frame in the rotary work machine 1. In the transmission of the agricultural machine according to the present invention, the axial size of the support frame and the transmission frame that determine most of the horizontal size of the agricultural machine is, for example, the model of the agricultural machine, the type of agricultural work, It can be appropriately determined according to the size, the width of the tractor, and the like. The support case 5 and the fin 6 are an example of a support case and a fin in the transmission of the agricultural machine according to the present invention.

  The other end of the support frame 7 whose one end is connected to the support case 5 is attached to a side frame 9 disposed so as to be perpendicular or substantially perpendicular to the support frame 7. A chain transmission case 10 is attached to the other end of the transmission frame 8 whose one end is connected to the transmission gear box 3 so as to be perpendicular or substantially perpendicular to the transmission frame 8. The side frame 9 and the chain transmission case 10 are disposed so as to be substantially parallel to and opposed to each other.

  The side frame 9 is a member that is formed by combining an appropriate plate and a frame-like member, and supports the rotary work machine 1 from the side. The chain transmission case 10 has an endless chain (not shown) therein. The other end of the transmission shaft 19 and the rotary shaft 11 in the rotary working unit 4 are engaged with the endless chain via a sprocket (not shown).

  The rotary working unit 4 is provided with a number of tilling blades 12 on the circumference of the rotary shaft 11 extending in the horizontal direction. The rotating shaft 11 is a rod-like member that can rotate around its axis. The tilling blade 12 is formed by bending a plate body having a blade edge, and is attached to the peripheral side surface of the rotating shaft 11 by appropriate fixing means. The tilling blade 12 has a function of tilling a field or the like. In the rotary working machine 1 to which the transmission of the agricultural working machine according to the present invention is applied, instead of the tilling blade 12, a mowing blade having a function of cutting weeds or the like may be used. It may be used. The rotating shaft 11 is an example of the rotating shaft in the transmission of the agricultural machine according to the present invention.

  The rotating shaft 11 is arranged so that its axis is parallel to the axes of the support frame 7 and the transmission frame 8. The rotating shaft 11 has one end attached to the chain transmission case 10 and the other end attached to the side frame 9.

  The rotary work machine 1 includes a shield cover 13 and a rear cover 14 that cover the vicinity of the support frame 7 and the transmission frame 8 to the rotary working unit 4. The shield cover 13 and the rear cover 14 can prevent mud splashing at the time of tillage and scattering of the grass at the time of mowing, and can also prevent an operator or the like from being caught. In addition, at the time of tillage work, work is performed with the lower end of the rear cover 14 in contact with the soil surface.

  A cover 15 is provided at the rear end of the transmission gear box 3. The cover 15 has a substantially trapezoidal shape in plan view, and the lower edge is fixed to the transmission gear box 3 and can be opened and closed so as to rotate around the fixed edge. The cover 15 is a lid member that can be opened when a change gear, an idle gear, and the like described later are inserted and removed. As is clear from FIG. 2 in particular, the upper free end portion that rotates when the cover 15 is opened and closed and the rear end portion on the outer peripheral surface of the transmission gear box 3 are fixed by the draw latch 16. By locking the draw latch 16 with the cover 15 in the closed state, the cover 15 can be prevented from being opened due to impact and vibration during plowing or mowing. Further, when the cover 15 is opened, the draw latch 16 may be unlocked.

  Next, the internal structures of the transmission gear box 3 and the support case 5 will be described in detail with reference to FIGS. FIG. 3 is a cross-sectional view of the transmission gearbox 3, and FIG. 4 is a cross-sectional view taken along the line XX shown in FIG. 3 and having the drive shaft 17 rotated about 90 °. FIG. 5 is a schematic view of the section taken along the YY plane shown in FIG. 3 is the forward direction of the tractor, that is, the forward direction of the transmission gear box 3.

  As shown in FIG. 3, two shaft bodies are inserted through the transmission gearbox 3 in the front-rear direction. Specifically, a drive shaft 17 that receives power directly from the PTO shaft of the tractor and a driven shaft 18 that is provided in parallel with the drive shaft 17 are disposed in the transmission gear box 3. The drive shaft 17 and the driven shaft 18 can rotate around their respective axes. Further, change gears 191, 192, 193, and 194 are provided on the rear end sides of the drive shaft 17 and the driven shaft 18 so as to be insertable and replaceable, and power is transmitted from the drive shaft 17 to the driven shaft 18 via the change gears 191 and 192. Be able to. In the present embodiment, the change gears 193 and 194 do not move even when the drive shaft 17 and the driven shaft 18 rotate, and are fixed to the gear housing portion 20. The drive shaft 17 and the driven shaft 18 are examples of the drive shaft and the driven shaft in the transmission device for agricultural machines according to the present invention.

  The upper end portion of the drive shaft 17 in FIG. 3, that is, the front end portion of the drive shaft 17 protrudes through the front wall of the transmission gear box 3 and is connected to a PTO shaft (not shown). The lower end portion of the drive shaft 17 in FIG. 3, that is, the rear end portion of the drive shaft 17 protrudes through the rear wall of the transmission gear box 3, and the change gear 191 is fixedly attached to the drive shaft 17. Yes. Further, the lower end portion of the driven shaft 18 in FIG. 3, that is, the rear end portion of the driven shaft 18 protrudes through the rear wall of the transmission gear box 3, and the change gear 192 is fixedly attached to the driven shaft 18. Has been. However, as described above, the change gears 191, 192, 193, and 194 can be inserted and replaced as described above, so that they are fixed with respect to the drive shaft 17, the driven shaft 18, or the gear housing portion 20 when mounted. However, it is possible to remove the fixed state when the replacement is performed.

  A change gear 191 attached to the rear end portion of the drive shaft 17 and a change gear 192 attached to the rear end portion of the driven shaft 18 are fixedly attached to the outside and rear surface of the transmission gear box 3. It is housed in the gear housing portion 20 of the box. The cover 15 is attached to the rear end side of the gear housing portion 20 so as to be opened and closed. Further, the change gear 191 and the change gear 192 are engaged with each other.

  A pinion 21 is fixedly attached to the driven shaft 18 at the upper end of the driven shaft 18 in FIG. 3, that is, at the front end of the driven shaft 18. The pinion 21 is disposed in the transmission gear box 3. A bevel gear 22 is fixedly attached to the transmission shaft 19 at an end portion of the transmission shaft 19 inserted into the transmission gear box 3. Further, the pinion 21 and the bevel gear 22 are engaged with each other.

  Since the drive shaft 17 can rotate around the axis as described above, when the drive shaft 17 rotates, the change gear 191 rotates in accordance with the rotation of the drive shaft 17. Further, since the driven shaft 18 can rotate around the axis as described above, when the change gear 192 rotates, the driven shaft 18 and the pinion 21 rotate in accordance with the rotation of the change gear 192. Further, since the transmission shaft 19 can rotate around the axis as described above, when the bevel gear 22 rotates, the transmission shaft 19 rotates in accordance with the rotation of the bevel gear 22.

  Since the drive shaft 17, the driven shaft 18, and the transmission frame 8 rotate, bearings B are respectively provided between the housing of the transmission gear box 3 that is fixed and the drive shaft 17, the driven shaft 18, and the transmission shaft 19. Has been placed. In addition, an O-ring 23, an oil seal 24, a packing 25, and the like are provided at contact portions between the drive shaft 17, the driven shaft 18, the transmission shaft 19, the gear housing portion 20, and the transmission gear box 3 from the viewpoint of preventing transmission oil leakage. Is installed.

As shown in FIG. 3, the transmission gear box 3 is a box that can be sealed by mounting a transmission gear box body 31, a transmission frame 8, a support case 5, and a support frame 7. A space for accommodating the mission oil in the transmission gear box 3 and a space for accommodating the mission oil in the bottomed cylindrical support case 5 communicate with each other to form a space for accommodating one mission oil. More specifically, the transmission gear box body 31 is provided with through holes in the left-right direction.
The transmission frame 8 and the transmission shaft 19 in the left-right direction are inserted from the left side opening of the through hole, and the opening is closed by the covering member C at the end of the transmission frame 8. Further, the drive shaft 17 and the driven shaft 18 are inserted through the transmission gear box 3 so that the axis is along the front-rear direction. Two holes into which the front end portion and the rear end portion of the drive shaft 17 and the front end portion and the rear end portion of the driven shaft 18 can be inserted are provided in the front and rear of the transmission gear box 3. As shown in FIG. 3, the transmission shaft 19, the driven shaft 18, and the drive shaft 17 are arranged in order from the opening covered with the covering member C of the transmission gear box 3. The support case 5 is provided on the opposite side of the driven gear 18 of the transmission gear box 3.

  An oil agitating member 26 is attached to the inside of the transmission gear box 3 and on the peripheral side surface of the drive shaft 17. More specifically, the oil agitating member 26 is a rectangular plate bent at an angle of about 2 to 3 °, and is fixed by being screwed to the peripheral side surface of the drive shaft 17 so as to protrude outside the drive shaft 17. Installed. In the upper part of FIG. 3, a cross-sectional view of the drive shaft 17 and the oil stirring member 26 taken along a plane orthogonal to the axis of the drive shaft 17 is shown. The oil stirring member 26 is an example of the oil stirring member in the transmission of the agricultural machine according to the present invention. In the transmission of the agricultural machine according to the present invention, the shape, size, attachment position, number of attachments, and material of the oil agitating member are such that when the oil agitating member rotates, a part of the oil agitating member is added to the mission oil. There is no particular limitation as long as positive stirring is achieved by contact.

  As shown in FIG. 4, the fins 6 are arranged so as to be radial when cut along a plane along the axis of the support case 5 and perpendicular to the axis of the support case 5.

  In the transmission of the agricultural machine according to the present invention, the positions where the support case and the fin are provided are not particularly limited. For example, transmission of power by various shafts and gears, cooling of the transmission oil, and later-described change gears and idles. It is preferable that the position does not hinder the gear insertion / extraction operation. In the transmission of the agricultural machine according to the present invention, the support case and the fins may be formed integrally, or may be formed separately and fixed to each other by appropriate joining means. Further, the material of the support case and the fin is not particularly limited. For example, it is preferable to use the same type of metal as the transmission gearbox or a material with a large amount of heat dissipation. Furthermore, in the transmission of the agricultural machine according to the present invention, the shape and size of the support case and the fins and the number of fins are not particularly limited as long as the cooling efficiency is not lowered.

  When the drive shaft 17 rotates, the oil stirring member 26 rotates about the axis of the drive shaft 17. Here, in FIGS. 4 and 5, the oil level S of the mission oil when a predetermined amount of mission oil is injected into the transmission gearbox 3 and the support case 5 is indicated by a two-dot chain line. As apparent from FIGS. 4 and 5, the oil level S of the mission oil in a state where the power from the tractor is not transmitted to the rotary work machine 1 and is stationary is obtained from the drive shaft 17 and the driven shaft 18. Located on the lower side. As shown in FIG. 4, when the drive shaft 17 of FIG. 3 rotates about 90 °, the tip of the oil agitating member 26 is immersed in the mission oil.

  In the transmission of the agricultural machine according to the present invention, it is preferable that the upper limit of the amount of mission oil is an amount in which the oil agitating member is immersed by about half. However, it is cooled by injecting the mission oil into the transmission gearbox and the support case until the drive oil and the driven shaft are immersed, that is, until the oil level is located above the drive shaft and the driven shaft, and cooling. I can. However, the oil agitating member and the mission oil itself can be a resistance to rotation of the drive shaft and can also be a resistance to rotation of the driven shaft and the transmission frame. Further, when a structure as shown in FIG. 3 is adopted as an embodiment of the transmission gear box, it is necessary to provide an oil seal between the transmission gear box 3 and the gear housing portion 20. Therefore, when the stationary oil surface is below the drive shaft and the driven shaft, the amount of mission oil in which at most about half of the oil stirring member is immersed is injected into the transmission gearbox and the support case. good.

  Change gears 191, 192, 193 and 194 are housed in the gear housing portion 20. The cover 15 is opened when the draw latch 16 is unlocked, and the cover 15 is moved to another change gear having a different number of teeth, the work of extracting the change gears 191, 192, 193 and 194 accommodated in the gear accommodating portion 20. The work of changing and the work of inserting the idle gear can be performed. The idle gear is a member that can be inserted between, for example, the change gear 191 and the change gear 192 that directly meshes with the change gear 191. By inserting the idle gear, the change gear 191 and the idle gear mesh with each other, and the idle gear and the change 192 mesh with each other, thereby increasing the number of gears. Can be reversed. Further, by inserting an idle gear having an appropriate number of teeth and pitch, the magnitude of the power transmitted from the change gear 191 to the change gear 192 and the speed of rotation can be changed and adjusted.

  Next, the operation and action of the rotary work machine 1 will be described. In the following, transmission of power from the PTO shaft to the tilling blade 12 and its action when the rotary working machine 1 performs tillage or mowing work will be described, and then the stirring of the mission oil in the transmission gearbox 3 and its action explain.

  First, the drive shaft 17 shown in FIG. 3 receives the power of the tractor from the connected PTO shaft. The power from the tractor is rotated and transmitted to the drive shaft 17. Since the drive shaft 17 is rotatable, the drive shaft 17 rotates in accordance with the rotation of the PTO shaft.

  When the drive shaft 17 rotates, the change gear 191 fixedly attached to the rear end portion of the drive shaft 17 rotates about the axis of the drive shaft 17. When the change gear 191 rotates, the change gear 192 that meshes with the change gear 191 rotates about the axis of the driven shaft 18 in a direction opposite to the rotation direction of the change gear 191. When the change gear 192 rotates, the driven shaft 18 having the change gear 192 fixedly attached to the rear end portion rotates about its axis. When the driven shaft 18 rotates, the pinion 21 fixedly attached to the front end portion of the driven shaft 18 rotates about the axis of the driven shaft 18. When the pinion 21 rotates, the bevel gear 22 that meshes with the pinion 21 rotates about the axis of the transmission shaft 19. When the bevel gear 22 rotates, the transmission shaft 19 having the bevel gear 22 fixedly attached to one end thereof rotates about its axis. Therefore, the power of the tractor received from the PTO shaft is transmitted to the transmission shaft 19 via the transmission gear box 3.

  Since the endless chain disposed inside the chain transmission case 10 shown in FIGS. 1 and 2 and the sprocket provided at the other end of the transmission shaft 19 are engaged, the tractor transmitted to the transmission shaft 19 The power of is transmitted to the endless chain. Since the endless chain is also engaged with a sprocket provided on the rotating shaft 11, the power from the tractor transmitted to the transmission shaft 19 is transmitted to the rotating shaft 11 through the endless chain. Due to the power from the tractor transmitted to the rotating shaft 11, the rotating shaft 11 rotates about its axis.

  When the rotating shaft 11 rotates, a plurality of tilling blades 12 mounted on the peripheral side surface of the rotating shaft 11 rotate around the axis of the rotating shaft 11. Note that the tilling blade 12 shown in FIG. 1 is a blade dedicated to tilling work. Note that the dual-purpose blades for tilling work and mowing work that can be used in place of the tilling blade 12 can express the tilling function and the mowing function according to the rotation direction. That is, switching between the tilling work and the mowing work is achieved by switching the rotation direction of the rotating shaft. Examples of the method of switching the rotation direction of the rotation shaft include a method of switching the rotation direction of the PTO shaft and a method of switching the rotation direction of the driven shaft by inserting an idle gear while maintaining the rotation direction of the PTO shaft. Can do.

  As described above, power is transmitted from the PTO shaft to the tilling blade 12. When the power from the PTO shaft starts to be transmitted, the tilling operation can be performed in a state where the tilling blade 12 is slightly buried in the field scene. In addition, the mowing operation can be performed in a state where the mowing blade or the like is attached instead of the tilling blade 12 and the rotation direction of the rotary shaft 11 is switched and is in contact with the field scene or slightly floating.

  When the drive shaft 17 rotates by receiving power from the PTO shaft, the oil stirring member 26 attached to the peripheral side surface of the drive shaft 17 rotates about the axis of the drive shaft 17. As shown in FIG. 4, the tip of the oil agitating member 26 is immersed in the mission oil when it reaches the bottom dead center in the rotation path, so that the oil agitating member 26 rotates when the oil agitating member 26 rotates. The member 26 repeatedly contacts the oil level S. By repeatedly contacting, it is possible to form a flow of mission oil in the transmission gearbox 3 and the support case 5.

  Furthermore, even if the oil agitating member 26 is immersed in the mission oil and the oil agitating member 26 is separated from the oil surface S of the mission oil by rotation, it is immersed in the surface of the oil agitating member 26, particularly the mission oil. A small amount of mission oil remains on the site. The mission oil that remains attached to the surface of the oil stirring member 26 scatters in the internal space of the transmission gear box 3 and the support case 5 due to the centrifugal force generated by the rotation of the oil stirring member 26. That is, when the oil agitating member 26 rotates, the oil agitating member 26 scoops up a small amount of mission oil, and the mission oil is scattered in the internal space of the transmission gear box 3 and the support case 5.

  Therefore, it is possible to agitate the mission oil by forming a constant flow of the mission oil by the oil agitating member 26 and further scattering in the transmission gear box 3 and the support case 5. 3 and 5 indicate the direction of flow formed in the mission oil, that is, the direction of stirring the mission oil. 3 and 5, the arrow shown around the tip circle of the oil stirring member 26 is the rotation direction of the oil stirring member 26. However, in the transmission of the agricultural machine according to the present invention, the direction of attaching the oil stirring member may be the same as that of the oil stirring member 26 and the rotation direction may be reversed.

  The scattered mission oil adheres to the inner wall surfaces of the transmission gearbox 3 and the support case 5. From the viewpoint of cooling efficiency, it is easier to cool the oil droplets attached to the inner wall surfaces of the transmission gear box 3 and the support case 5 as oil droplets having a smaller volume than the state stored in the bottoms of the transmission gear box 3 and the support case 5. . The mission oil adhering to the inner wall surfaces of the transmission gear box 3 and the support case 5 falls into the mission oil stored at the bottom together with the mission oil that scatters later.

  The support case 5 in which the heat dissipating fins 6 are formed on the outer peripheral surface has a larger amount of heat dissipation than the transmission gear box 3. Therefore, it is preferable to appropriately determine the mounting direction and size of the oil stirring member 26 so that the oil stirring member 26 scoops up the mission oil and scatters it toward the inner wall surface of the support case 5.

  As shown in FIG. 3, the transmission shaft 19, the driven shaft 18, and the drive shaft 17 are disposed in this order in the transmission gear box 3, and the side of the drive shaft 17 on which the driven shaft 18 and the transmission shaft 19 are disposed. A support case 5 is provided on the opposite side. If the rotation direction transmitted from the PTO shaft to the drive shaft 17 is constant and remains constant during tillage work and mowing work, an oil stirring member 26 is installed as shown in FIG. It is preferable to stir the mission oil in a direction in which the member 26 is directed from the transmission gear box 3 to the support case 5. Thereby, for example, even if an idle gear is inserted for the purpose of switching the work mode, the rotation direction of the oil agitating member 26 attached to the drive shaft 17 is constant, so that the direction toward the support case 5 with a large amount of heat radiation is directed. Mission oil agitation is preferable because it can always be achieved.

  As described above, the agitation of the mission oil sealed in the transmission gear box 3 and the support case 5 in the rotary work machine 1 is achieved. The transmission gear box 3 in the rotary working machine 1 forms a larger flow in the mission oil than the transmission in the conventional agricultural working machine, and further radiates heat by the support case 5 and the fins 6 attached to the transmission gear box 3. Since the surface area for use is increased, the cooling efficiency is high.

  By increasing the cooling efficiency of the transmission in the agricultural machine, the shafts and gears in the transmission can be prevented from being worn and damaged due to excessive temperature rise of the mission oil. As a result, work efficiency of tillage work and mowing work is improved by preventing wear and damage of shafts and gears in the transmission. As described above, since the rotary working machine 1 is provided with the oil stirring member 26, the support case 5, and the fins 6, a good cooling efficiency can be obtained. Thereby, various farm work which requires a low rotation speed, a middle rotation speed, and a high rotation speed becomes possible. As a method for switching the work modes in various ways, for example, change gears 191, 192, 193 and 194 can be exchanged, and idle gears can be inserted and removed. The rotary working machine 1 easily exposes the portions of the drive shaft 17 and the driven shaft 18 where the change gears 191, 192, 193, and 194 are attached by simply opening and closing the cover 15, and switching the work mode is simple and easy. Can be done quickly. Therefore, work efficiency related to farm work such as tillage work and mowing work is improved by good cooling efficiency and simple and quick switching of work forms.

  As mentioned above, although embodiment which applied the invention made | formed by this inventor was described, this invention is not limited by the description and drawing which make a part of indication of this invention by this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

1: Rotary working machine (cultivation / mowing machine), 2: 3-point link hitch mechanism, 201: Top link connecting part, 202: Lower link connecting part, 3: Shifting gear box, 31: Shifting gear box body, 4: Rotary work Part, 5: support case, 6: fin, 7: support frame, 8: transmission frame, 9: side frame, 10: chain transmission case, 11: rotating shaft, 12: tillage blade, 13: shield cover, 14: Rear cover, 15: cover, 16: draw latch, 17: drive shaft, 18: driven shaft, 19: transmission shaft, 191, 192, 193 and 194: change gear, 20: gear housing, 21: pinion, 22: bevel gear, 23: O-ring, 24: Oil seal, 25: Packing, 26: Member for oil stirring, T: Tractor, B: Bearing, S: Oil surface, C: Covering part

Claims (7)

A three-point link hitch mechanism connected to the rear of the tractor;
A transmission gearbox that receives power from the PTO shaft of the tractor;
A rotary working unit to which a plurality of tillage blades or mowing blades are mounted on the circumference of a rotating shaft extending in the horizontal direction,
The transmission gearbox has a drive shaft that receives power from the PTO shaft of the tractor, and a driven shaft that is arranged in parallel with the drive shaft,
A change gear is provided on the rear end side of the drive shaft and the driven shaft so that the change gear can be inserted and replaced. Power is transmitted from the drive shaft to the driven shaft through the change gear, and the drive shaft is moved up and down through the three-point link hitch mechanism. Agricultural work machines that are connected to perform plowing work or mowing work.
An oil stirring member attached to the drive shaft or the driven shaft;
A support case for oil agitation cooling provided on a side opposite to the driven shaft of the transmission gear box and forming a space for storing oil together with the transmission gear box;
A heat dissipating fin provided on the outer surface of the support case,
When the drive shaft or the driven shaft to which the oil stirring member is attached rotates,
The oil stirring member scoops up the oil in a direction from the transmission gear box toward the support case, and scatters the oil in the internal space of the transmission gear box and the support case. . A drive shaft that receives power from the PTO shaft of the tractor, a driven shaft that is arranged in parallel with the drive shaft,
A transmission gearbox having an oil stirring member attached to the drive shaft or the driven shaft;
A support case for oil agitation cooling provided on a side opposite to the driven shaft of the transmission gear box and forming a space for storing oil together with the transmission gear box;
A heat dissipating fin provided on the outer surface of the support case,
When the drive shaft or the driven shaft to which the oil stirring member is attached rotates,
The oil stirring member scoops up the oil in a direction from the transmission gear box toward the support case, and scatters the oil in the internal space of the transmission gear box and the support case. . A cover for inserting and replacing at least one of the change gear, another change gear having a different number of teeth, and an idle gear is provided on the rear surface of the transmission gear box.
The transmission of the agricultural machine according to claim 1 or 2. A part of the transmission shaft to which power is transmitted from the driven shaft is inserted into the transmission gear box,
The transmission shaft, the driven shaft, and the drive shaft are arranged in this order in the transmission gear box,
The transmission of the agricultural machine according to any one of claims 1 to 3, wherein the support case is provided on a side of the drive shaft opposite to a side where the driven shaft and the transmission shaft are disposed. The transmission of the agricultural working machine according to any one of claims 1 to 4, wherein an oil level is positioned below the drive shaft and the driven shaft when stationary. The transmission for a farm work machine according to any one of claims 1 to 5, wherein the oil stirring member is a bent rectangular plate.   A farm work machine provided with the transmission according to any one of claims 1 to 6.

Images