JP3586908B2 - Rotary transmission in tiller - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a rotary transmission in a cultivator.
[0002]
[Prior art]
BACKGROUND ART Conventionally, a cultivator having a forward and reverse dual cultivation rotary, in which a cultivating shaft is constituted by an inner shaft and a cylindrical outer shaft which covers the cultivating shaft, is disclosed in JP-A-6-165604. And Japanese Patent Application Laid-Open No. 6-197602, etc., and have been widely used as small cultivators for management. However, the power transmission system between the inner shaft and the outer shaft for cultivation in this conventional cultivator is provided with a sprocket at the start end portion of the transmission case and a cultivation drive shaft portion at the end side portion or a sprocket. A sprocket is provided on the canter shaft portion on the front side of the first stage, and chain transmission is performed at once from the start end to the end side. At the end side of this transmission case, the internal shaft and the external shaft are reversed. Transmission mechanism.
[0003]
[Problems to be solved by the invention]
In the above-mentioned prior art, the transmission case for the reverse rotation cannot be installed unless a wide transmission case is formed in which the end side of the transmission case is largely swelled right and left, so that the center drive type transmission case cannot be provided. There was a drawback that the compaction could not be achieved, and that the remaining tillage of the cultivator became wide, and that the distance of chain transmission became long, so that noise due to chain elongation increased.
[0004]
[Means for Solving the Problems]
The present invention has taken the following technical measures in order to solve the above-mentioned problems. That is, in the center-drive type cultivator, the inner cultivation shaft 27 and the inner cultivation shaft 27 having a double structure with the cultivation shaft projecting to the left and right sides at the end side of the cultivation transmission case 5 for the center drive. The transmission case 5 is constituted by a cylindrical outer cultivating shaft 33, 34 which covers the input shaft on the starting end side of the transmission case 5 and the transmission clutch gears 14, 15 for high-speed and low-speed switching are brought close to each other in the left-right direction. The transmission clutch gears 14 and 15 are selectively engaged with left and right transmission gears 19 and 20 supported on a first counter shaft 18 and are located at an intermediate portion between the left and right transmission gears 19 and 20. A third counter shaft provided at the center of a third counter shaft 24 from a first counter gear 21 rotating integrally with the transmission gear via a second counter gear 23 supported by a second counter shaft 22. Counter gear -26 The third counter gear 26 drives the internal tilling shaft gear 28 fixed to the internal tilling shaft 27, and is supported by the third counter shaft 24 and integrally with the third counter gear 26. A pair of left and right driving sprockets 29 and 30 are provided, and a pair of left and right driving sprockets 29 and 30 are provided on the outer tilling shafts 33 and 34 and provided on left and right sides of the internal tilling shaft gear 28. The chain 35, 36 is wound between the driven sprockets 31, 32, and the inner cultivating shaft 27 and the outer cultivating shafts 33, 34 are transmitted in a reversing manner. .
[0005]
【Example】
An example of the present invention will be described in detail with reference to the drawings. The outline of the cultivator will be described with reference to FIG . Reference numeral 1 denotes an engine base, which is fixed to the front side of a traveling transmission case 2 and on which the engine 3 is mounted. Then, a belt is wound around a pulley attached to an input shaft protruding from the pulley attached to the output shaft of the engine 3 to the upper side surface of the traveling transmission case 2 and driven. Reference numeral 4 denotes a belt cover. A mounting frame portion 2a for mounting the upper side of the tillage transmission case 5 is integrally formed on the upper side of the front machine traveling transmission case 2. The tilling transmission case 5 is made of an iron plate in the embodiment in order to make the left and right width as narrow as possible.
[0006]
6 is a fuel tank. Reference numeral 7 denotes a control handle, 8 denotes a control panel frame, and 9 denotes a change lever. Reference numeral 10 denotes a chain case, which is wound around a sprocket attached to a drive shaft protruding laterally on the traveling transmission case 2 side and a sprocket 12 attached to an input shaft 11 on the tilling transmission case 5 side. The chain 13 is covered. Next, the transmission mechanism in the tilling transmission case 2 will be described.
[0007]
Reference numerals 14 and 15 denote clutch gears. Both gears are integrally formed, and are spline-fitted to the input shaft 11 so as to be movable on the shaft. Then, the shift pin 17 fixed to the change pin 16 can be appropriately moved. Reference numeral 18 denotes a first counter shaft. The transmission gears 19 and 20 provided on both right and left sides of the shaft and a first counter gear 21 provided therebetween are freely rotatably mounted on the shaft. The first counter gear 21 rotates at a low speed when the gears 14 and 19 mesh with each other, and the first counter gear 21 rotates at a high speed when the gears 15 and 20 mesh with each other. It is configured to rotate.
[0008]
Reference numeral 22 denotes a second counter shaft, on which a second counter gear 23 meshing with the first counter gear 21 is rotatably mounted. Reference numeral 24 denotes a third counter shaft, which is formed on a spline shaft. The left and right ends of the counter shaft are received by bearings 25, 25 and are rotatably provided. A third counter gear 26 is fixed to the left and right centers of the shaft 24 and meshes with the gear 23. Reference numeral 27 denotes an inner tilling shaft, which is a shaft at the last end in the tilling transmission case 5, and a gear 28 for an inner tilling shaft is fixed at the left and right center thereof and meshes with the gear 26. Reference numerals 29 and 30 denote a pair of driving sprockets, which are inserted and secured to the third counter shaft 24. These driving sprockets 29 and 30 are located on the left and right sides of the gear 26. Reference numerals 31 and 32 denote driven sprockets, which are integrally attached to cylindrical outer tilling shafts 33 and 34 provided on the outer periphery of the inner tilling shaft 27, and are provided between the sprocket 29 and the sprocket 31 and between the sprocket 30 and the sprocket 32. The outer tilling shafts 33 and 34 are transmitted and driven by winding chains 35 and 36 therebetween.
[0009]
Therefore, the internal cultivation shaft 27 and the external cultivation shafts 33 and 34 are configured to be always driven to reverse rotation. Bearings 37, 37 are provided with outer rings fitted to metal 38 fixed to the tilling transmission case 5 side to rotatably support the outer tilling shafts 33, 34. Numerals 39, 40, 41 and 42 are seals.
[0010]
Reference numeral 43 denotes a cultivating cylinder shaft to which an inner cultivating sword 45a is attached. The cultivating cylinder shaft 43 is fitted around the outer cultivating shafts 33 and 34, and is attached by a key 46 so as to rotate integrally with the outer cultivating shafts 33 and 34. Reference numeral 44 denotes a cultivating cylinder shaft to which an outer cultivating sword 45b is attached, which is inserted through the left and right outer ends of the inner cultivating shaft 27 and connected by pins 47.
[0011]
Reference numeral 48 denotes a seal protecting flange. 49 is a tillage cover, 50 is a tillage depth adjusting tool. The operation of the above example will be described. The engine 3 drives the transmission mechanism on the traveling power transmission case 2 side and the power transmission mechanism on the tilling transmission case 5 side to perform the tilling operation while steering the tilling machine. In this case, when the power is transmitted to the input shaft 11 of the transmission mechanism on the tilling transmission case 5 side, the tilling shaft is driven as follows. If the shift pin 17 is moved in the direction of the arrow (a) from the neutral state in FIG. 3 by appropriately pushing and pulling the change pin 16, the gear 14 and the gear 19 mesh with each other, and the gear 21 is rotated at a low speed. When the shifter 17 is operated in the direction opposite to the arrow (a), the gear 15 and the gear 20 are engaged with each other, and the gear 21 is rotated at a high speed. In this way, a high-speed and low-speed selection operation is performed according to the operation.
[0012]
The gear 23 is transmitted from the gear 21 and the gear 26 is driven. At the same time, the shaft 24 is also rotated in the same direction, and the sprockets 29 and 30 wedged to the shaft 24 are also in the same direction. Rotated. Then, the internal tilling shaft 27 is rotated from the third counter gear 26 via the internal tilling shaft gear 28, while the driven sprockets 31 and 32 are driven from the driving sprockets 29 and 30 via the chains 35 and 36. The outer tilling shafts 33 and 34 integrally provided therewith are driven and rotated in a direction opposite to that of the inner tilling shaft 27.
[0013]
The cultivating cylinder shaft 44 located on the left and right sides is rotated from the inner cultivating shaft 27, while the cultivating cylinder shaft 43 is rotated from the outer cultivating shafts 33 and 34 via the key 46. Therefore, the cultivation cylinder shaft 43 and the cultivation cylinder shaft 44 are driven and rotated to opposite sides, and the cultivation operation is performed in a state where the cultivation blades 45a and 45b are reversed. In the embodiment, the tilling blade 45a on the center part rotates in the direction of the arrow (b) shown in FIG. 1, and the tilling blade 45b on the left and right sides rotates in the direction opposite to the normal direction of rotation (b). It is configured to
[0014]
As described above, the tilling operation is performed while the tilling blade 45a and the tilling blade 45b are inverted with respect to each other. In this case, the transmission mechanism in the tilling transmission case 5 has a high speed and a low speed on the upper side of the case. Switching is carried out, and in the vicinity of the tilling shaft portion, which is the lower side of the case, the transmission has a narrow right and left width transmission configuration consisting of a simple series of gear transmissions and chain transmissions on the left and right sides thereof. Because of the structure that is stretched between the counter and the shaft that is closest to the shaft, it is possible to minimize the elongation of the entire chain length even for long-term use. Chain noise can be reduced.
[0015]
It should be noted that other specific configurations in the above embodiment will be described in some detail. In the embodiment of the present invention, regarding the configuration of the tilling cover 49, since the forward and reverse tilling blades 45a and 45b are configured to be divided in the left-right width direction, a portion where the reverse tilling blade 45a is disposed. in, so that the tilling fine soil in the advancing direction during tillage is blown. Therefore, the provision of the rear cover 49a as in the conventional cultivator that only performs forward rotation does not achieve a sufficient cover function. Further, there is a disadvantage that when the tilling fine soil blows up from the front side, the dust makes the operator unsanitary. Further, if the front cover portion is configured in the same manner as the reverse rotation portion as well as the normal rotation portion, it is difficult for the tillable fine soil to be excreted outside, the tillage resistance increases, the engine load increases, and the tillage performance decreases. There is.
[0016]
From such a viewpoint, it is desirable that the cover 49 of the forward and reverse type cultivator be configured as shown in FIG . That is, the front cover portion corresponding to the reversing portion of the tilling blade of the cover 49 is notched upward to form a cutout portion (c), and the front cover can rotate the cut portion (c) forward. 49b. The front cover 49b is generally made of a bendable rubber plate, but it may be configured so that the upper side of the iron plate is pivotally supported on the cover 49 by a horizontal pin and turned.
[0017]
In this way, the soil can be projected forward by rotation of the reverse tilling blade 45a, and tilling resistance can be reduced. By providing the fixed teeth 51 hanging down from the upper side of the fixed portion to the notched portion (c), the front cover 49b may be unexpectedly caught by the reverse tilling blade 45a and damaged. No, the tillage crushing function is improved and the fine soil function can be improved.
[0018]
Regarding the configuration of the notched portion (c), as shown in FIGS. 8 and 9, a cover structure in which the cultivation cover 49 corresponding to the reverse cultivation portion width is bulged outward (d). It is also possible. By doing so, the tilling resistance can be reduced, the load on the engine can be reduced, and the amount of soil blown out can also be reduced. In this type of small cultivator, in a so-called management machine that plows a ridge surface of a field or a mere flat field surface regardless of whether the cultivation blade is rotating forward or reverse, how to make the topsoil surface after tilling even Finishing is an evaluation of commercial value. In this case, the rear cover 49a according to the embodiment of the present invention does not have a function of leveling the irregularities on the topsoil surface because the rear cover 49a moves up and down easily following irregularities on the topsoil surface.
[0019]
Therefore, the left and right side surfaces and the back surface are surrounded in a U-shape in plan view with the cultivation shaft as the center of rotation, and the enclosure is leveled with a cover of the ground level. There was a technique disclosed in Japanese Patent Application Laid-Open No. 68603/1994, but when this technique was actually used, the working speed was reduced due to excessive running resistance due to too much surface resistance and no escape to the upper side. There was a drawback that tilling work could not be performed. In order to solve this problem, as shown in FIGS. 10 and 11, a rotation support shaft portion (e) is provided far in front of the tilling shaft so that the side cover and the back surface can be turned up and down. −52 is provided, and an appropriate locking body 53 is provided so as not to lower the auxiliary cover 52 beyond a certain limit. The auxiliary cover 52 includes a side surface portion 52a and a back surface portion 52b having a U-shape in plan view, and a flexible rubber plate 54 is attached to a lower portion of the back surface portion 52b. It is configured so that it is propelled by contacting the topsoil surface while being turned rearward like a line, and the cover 52 moves up and down due to the contact resistance. In addition, a bent portion 52c bent forward is formed on the upper portion on the back side of the auxiliary cover 52 to prevent the tilling soil from rising upward and function as a stopper portion when descending. I have.
[0020]
Function and effect of the present invention
According to the present invention, although the tilling blade 45a and the tilling blade 45b are a forward / reverse type tilling device in which the tilling work is performed while reversing each other, the power transmission mechanism in the tilling power transmission case is the same as that of the case. Switching between high speed and low speed is performed on the upper side, and the transmission clutch gears 14 and 15 are provided close to each other, so that the width of the transmission case can be reduced, and furthermore , the tilling shaft portion which is the lower side of the case. In the vicinity, the transmission has a narrow left-right transmission configuration consisting of a mere series of gear transmissions and chain transmissions on the left and right sides thereof, and the chain transmission is stretched between the counter shaft closest to the tilling shaft. Due to the configuration, the elongation of the entire chain length can be minimized even during long-term use, and a very compact lower-side transmission configuration can be achieved, and the chain noise during transmission can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view. FIG. 2 is a back sectional view of a tilling part. FIG. 3 is a back sectional view of a main part. FIG. 4 is a side view of a main part. FIG. FIG. 7 is a rear view of a partly broken view in FIG . 6 ; FIG. 8 is a side view of another example of a main part; FIG. 9 is a sectional view taken along line AA in FIG. 8 ; [FIG. 11] Rear view of FIG . 10 [Description of reference numerals]
5 Tilling transmission case 14 Transmission clutch gear
15 Shift clutch gear
18 First counter shaft 19 Transmission gear
20 transmission gear
21 1st counter gear
22 Second counter shaft 23 Second counter gear
24 Third counter shaft 26 Third middle counter gear
27 Internal cultivation shaft 28 Internal cultivation shaft gear
29 Drive sprocket 30 Drive sprocket 31 Drive sprocket 32 Drive sprocket 33 External tilling shaft 34 External tilling shaft 35 Chain 36 Chain

Claims (1)

In the center drive type cultivator, an inner cultivation shaft 27 having a double structure with a cultivation shaft projecting to the left and right sides at the end side of the cultivation transmission case 5 for the center drive, and a cylinder covering the inner cultivation shaft 27 The externally cultivating shafts 33 and 34 are formed in a shape, and the transmission clutch gears 14 and 15 for high-speed and low-speed switching are arranged close to the input shaft on the starting end side of the transmission case 5 in the left-right direction. These transmission clutch gears 14 and 15 are selectively meshed with left and right transmission gears 19 and 20 supported on a first counter shaft 18, and are located at an intermediate portion between the left and right transmission gears 19 and 20. A third middle counter gear provided at the center of a third counter shaft 24 from a first counter gear 21 rotating integrally with the transmission gear via a second counter gear 23 supported on a second counter shaft 22. Drives -26 Then, the internal tilling shaft gear 28 fixed to the internal tilling shaft 27 is driven from the third counter gear 26, and is supported by the third counter shaft 24 to rotate integrally with the third counter gear 26. A pair of left and right driving sprockets 29 and 30 are provided. A pair of driven sprockets are provided on the pair of left and right driving sprockets 29 and 30 and the outer tilling shafts 33 and 34 and provided on the left and right sides of the internal tilling shaft gear 28. A rotary transmission in a tilling machine having a transmission structure in which chains 35 and 36 are wound between sprockets 31 and 32 so that an internal cultivating shaft 27 and external cultivating shafts 33 and 34 are reversed.

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