JP4026964B2 - Management machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a management machine that improves the positioning accuracy of a drive shaft that transmits power to a tilling shaft.
[0002]
[Prior art]
As a management machine such as a field cultivator, for example, a field cultivator disclosed in Japanese Utility Model Publication No. 58-157029 “Clutch mechanism in a small field cultivator” is known.
The above technology is such that the clutch release arm is configured to be positioned near the lateral side of the rotation trajectory of the tip of the tillage claw, thereby lowering the position of the clutch housing and the engine and lowering the center of gravity of the tiller. As shown in FIG. 1 of the same publication, a cultivator employing this technology includes a lower housing 2b which is a lower portion of the clutch housing 2, a gear case 4 attached to a lower end portion of the lower housing 2b, and these clutch housings. 2, a drive shaft 11 disposed from the inside of the gear case 4 to the gear case 4, and a bearing 9 attached to the gear case 4 to support the lower end of the drive shaft 11.
This cultivator has a structure in which the upper opening of the gear case 4 is fitted to the lower end of the lower housing 2 b and the lower part of the gear case 4 is attached to the lower end of the drive shaft 11 via the bearing 9.
[0003]
[Problems to be solved by the invention]
In the above technique, since the lower end portion of the lower housing 2b and the lower end of the drive shaft 11 are largely separated from each other, when the gear case 4 is attached to the clutch housing 2, the gear case 4 may be changed depending on the processing accuracy of the lower end portion of the lower housing 2. It is conceivable that the bearing 9 is not correctly mounted and the position of the bearing 9 is shifted, which adversely affects the positioning accuracy of the lower end of the drive shaft 11.
[0004]
When the gear case 4 is attached to the clutch housing 2, the upper and lower portions of the gear case 4 are inserted into the lower end portion of the lower housing 2b and the lower end of the drive shaft 11 almost simultaneously, and the bearing 9 Because it is at the bottom of the gear case 4, the assembly work is somewhat difficult.
[0005]
Furthermore, for example, when supplying oil into the gear case 4, it is conceivable to supply oil by providing an oil supply hole. However, providing the oil supply hole specially increases the cost.
A method of supplying oil from an opening for inserting the drive shaft 11 before inserting the drive shaft 11 into the gear case 4 without providing an oil supply hole is conceivable. However, since the size of this opening is limited, the amount of oil supplied per unit time It is not possible to increase the amount of oil, and the oiling time becomes longer. As a result, the assembly time may be long.
[0006]
Accordingly, an object of the present invention is to provide a management machine that can increase the positioning accuracy of the tip end portion of the drive shaft, can be easily and quickly assembled.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 is a management machine that transmits power from an engine to a tillage shaft through a drive shaft, and a gear case is provided with a worm provided on the drive shaft and a tillage to mesh with the worm. In a management machine that houses a speed reduction mechanism consisting of a worm wheel attached to a shaft, the gear case is supported by a gear case body that supports the tilling shaft and the middle portion of the drive shaft, an opening opened in the gear case body, and the opening is closed. In addition, a lid having a bearing for supporting the tip of the drive shaft, a plurality of positioning sleeves interposed between the lid and the gear case main body, and the lid for the gear case main body to accurately position the lid on the gear case main body consist of a fastening bolt passed through into the positioning sleeve for fastening to the positioning sleeve, 1 each arranged in the longitudinal substantially above the center line extending in the traveling direction of the center line of Yakesu, extending the cultivating shaft from both sides of the gear case was fitted with a lid at the bottom of the gear case body.
[0008]
To assemble the gear case, the opening of the gear case main body is closed with a plurality of positioning sleeves with a lid provided with a bearing, and a fastening bolt is passed through the positioning sleeve to fasten the lid to the gear case. Here, for example, when lubricating oil is supplied into the gear case, the lubricating oil is supplied from the opening of the gear case body before closing the opening of the gear case body with a lid.
[0009]
Further, the positioning sleeve, that has one each arranged around substantially above the center line extending in the traveling direction of the center line of the gear case, positioning the sleeve does not project in the width direction of the gear case.
Therefore, the width of the gear case is reduced, the projected area from the front of the gear case is reduced, and the running resistance due to earth and sand that is pushed away by the gear case during plowing is reduced.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a management machine according to the present invention. The management machine 1 uses an engine 2 and cultivating claws 3... 4 (... indicates a plurality. The same applies hereinafter). A gear case 5 attached to the lower part of the engine 2, a handle post 6 extending obliquely rearward and upward from the rear part of the gear case 5, a handle 7 attached to the upper part of the handle post 6, The clutch lever 8 is attached. In addition, 11 is a fuel tank, 12 is an engine cover, 13 is an air cleaner, 14 is an earth and sand scattering prevention cover, 15 is a body guard, 16 is a stand, and 17 and 17 are wheels (reference numeral 17 on the front side is not shown).
[0011]
FIG. 2 is a view taken in the direction of the arrow 2 in FIG. 1. The management machine 1 is provided with a gear case 5 at the lower portion, extends a tilling shaft 21 from both sides of the gear case 5, and brackets 22, 22 at both ends of the tilling shaft 21. The tilling claws 3, 4... Are attached to the two ends of the tiller shaft 21, and the shaft portions 23, 23 of the wheels 17, 17 are attached to both ends of the tilling shaft 21.
The gear case 5 has a flat shape that is longer in the traveling direction and shorter in the width direction than in FIGS. 1 and 2.
[0012]
3 is a cross-sectional view taken along line 3-3 in FIG. 2, and the management machine 1 is integrally formed with a drive shaft 26 connected to a crankshaft (not shown) of the engine 2 (see FIG. 1). And a worm wheel 28 that meshes with the worm 27 and is rotatably attached to the tilling shaft 21.
The worm 27 and the worm wheel 28 constitute a speed reduction mechanism 29.
In other words, the management machine 1 has a speed reduction mechanism 29 arranged at the connecting portion between the drive shaft 26 and the tilling shaft 21.
[0013]
Thus, since the speed reduction mechanism 29 is composed of the worm 27 and the worm wheel 28, the speed reduction ratio of the speed reduction mechanism 29 can be set large with a small number of parts, and the speed reduction mechanism 29 can be configured compactly.
[0014]
The gear case 5 houses the above-described reduction mechanism 29, supports the tilling shaft 21, and supports the intermediate portion of the drive shaft 26 with bearings 31, 31, an opening 33 opened in the gear case main body 32, A lid 35 provided with a bearing 34 for closing the opening 33 and supporting the tip 26a of the drive shaft 26, and between the lid 35 and the gear case main body 32 in order to accurately position the lid 35 on the gear case main body 32. The positioning sleeves 36 and 36 are interposed, and fastening bolts 37 and 37 are inserted through the positioning sleeves 36 and 36 in order to fasten the lid 35 to the gear case body 32.
[0015]
4 is a cross-sectional view taken along line 4-4 of FIG. 1. The tillage shaft 21 is attached to the gear case body 32 via bearings 41 and 41, and the gear case outside the bearings 41 and 41 is prevented so that oil in the gear case 5 does not leak. The oil seals 42 and 42 are respectively attached between the cultivating shaft 21 and the tilling shaft 21, and covers 43 and 43 are arranged outside the oil seals 42 and 42, respectively, in order to prevent the oil seals 42 and 42 from hitting pebbles or the like. This shows that the lid 35 is attached to the lower part of the gear case main body 32.
[0016]
Here, 28a is an annular recess provided on the side surface of the worm wheel 28, and 44 and 44 are for attaching the shaft portions 23 and 23 (see FIG. 2) of the wheels 17 and 17 (see FIG. 2) to both ends of the tilling shaft 21, respectively. A pin hole for inserting a pin (not shown), 45 is a thrust washer that rotates with the tilling shaft 21 and slides with the worm wheel 28, 46 and 47 are spacers, and 48 is a ring that prevents one bearing 41 from coming off.
The gear case 5 includes a clutch mechanism 50 in the gear case body 32 for intermittently transmitting power transmitted from the worm wheel 28 to the tilling shaft 21.
[0017]
FIG. 5 is a bottom view of the management machine according to the present invention, and shows a state in which the lid 35 shown in FIG. 4 is removed and the opening 33 of the gear case main body 32 is looked up.
The gear case main body 32 is a case having a long cross section in the traveling direction, and sleeve insertion holes 61 for inserting positioning sleeves 36 and 36 (see FIG. 3) around the center line CL extending in the traveling direction. 61 and the sleeve insertion holes 61, 61 are coaxially formed with bolt holes 62, 62 for screwing fastening bolts 37, 37 (see FIG. 3), and the side walls 63, 63 are respectively provided with bolt holes 64, 64 as center lines CL. And opened side by side in parallel. The center line CL of the gear case body 32 is also the center line of the lid 35 (see FIG. 4). That is, the center line CL is also the center line of the gear case 5 (see FIG. 4) including the gear case body 32 and the lid 35.
The sleeve insertion hole 61 is for inserting the positioning sleeve 36 without rattling.
[0018]
As described above, one positioning sleeve 36 is arranged on the front and rear of the center line CL extending in the traveling direction among the center lines of the gear case 5 so that the positioning sleeve 36 extends in the width direction of the gear case 5. Does not protrude.
Therefore, the width of the gear case 5 can be reduced, and as is apparent from FIG. 4, the projected area from the front of the gear case 5 is reduced, and for example, the running resistance due to earth and sand pushed away by the gear case 5 during plowing is reduced. Can improve tillage performance.
[0019]
FIG. 6 is a perspective view of the gear case main body and the lid according to the present invention. The lid 35 is used for inserting positioning sleeves 36 and 36 substantially before and after the center line CL (see FIG. 5) extending in the traveling direction. The sleeve insertion holes 65, 65 and bolt insertion holes 66, 66 into which the fastening bolts 37, 37 (see FIG. 3) are inserted coaxially are formed in the sleeve insertion holes 65, 65, and bolt insertion holes are formed in the side walls 67, 67, respectively. 68 and 68 are opened in parallel with the center line CL and arranged in the front-rear direction, and a bearing mounting hole 69 for press-fitting the bearing 34 is formed in the front part.
The sleeve insertion hole 65 is for inserting the positioning sleeve 36 without rattling.
[0020]
Next, the assembly procedure of the gear case 5 described above will be described.
FIG. 7 is an assembly explanatory view for explaining the assembly procedure of the gear case of the management machine according to the present invention, which will be described in order of the following numbers 1-5 . In addition, the following numbers 1 to 5 correspond to the circled numbers 1 to 5 in the figure , respectively.
1. The positioning sleeves 36 and 36 are inserted into the sleeve insertion holes 61 and 61 with the top of the gear case body 32 turned upside down and the opening 33 facing upward.
[0021]
2. Lubricating oil is poured into the gear case body 32 from the opening 33.
3. The bearing 34 is attached to the bearing mounting hole 69 of the lid 35.
4). The lid 35 is placed on the gear case body 32. At this time, the positioning sleeves 36 and 36 are inserted into the sleeve insertion holes 65 and 65 of the lid 35.
[0022]
5. One fastening bolt 37 is inserted into the bolt insertion hole 68 of the lid 35 and the positioning sleeve 36 in this order, and is screwed to the bolt hole 64 of the gear case body 32. The other fastening bolt 37 is similarly operated. In this way, the lid 35 is fastened to the gear case body 32.
This completes the assembly of the gear case 5.
[0023]
As described above, since the positioning sleeves 36, 36 are provided in the gear case 5, the positioning accuracy of the lid 35 with respect to the gear case body 32 can be improved, and the drive shown in FIG. The positioning accuracy of the tip of the shaft 26 can be improved.
Accordingly, the meshing accuracy between the worm 27 and the worm wheel 28 of the drive shaft 26 is improved, the partial wear of the speed reduction mechanism 29 can be reduced, and the life of the speed reduction mechanism 29 can be extended.
[0024]
In FIG. 7, the gear case main body 32 and the lid 35 are separated from each other, and the lid 35 provided with the bearing 34 is attached to the gear case main body 32. Therefore, the sleeve is inserted into the opening 33 of the gear case main body 32 at the time of attachment. The positions of the holes 61 and 61, the tip of the drive shaft 26, the bearing 34 concentrated on the mounting surface of the lid 35, the sleeve insertion holes 65 and 65, and the positioning sleeves 36 and 36 can be confirmed at a time, and the gear case The lid 35 can be easily attached to the main body 32, and the bearing 34 can be easily attached to the tip of the drive shaft 26 (see FIG. 3).
Therefore, the assemblability of the gear case 5 can be improved.
[0025]
Furthermore, when supplying lubricating oil to the speed reduction mechanism 29 in the gear case 5, the lubricating oil can be poured using the opening 33 of the gear case main body 32 at the time of assembly, and there is no need to provide a special oil supply hole. Since the large opening 33 can increase the amount of oil supply per unit time, the oil supply can be performed in a short time, and as a result, the assembly work can be performed speedily.
Also by this, the assemblability of the gear case 5 can be improved.
[0026]
Furthermore, since the fastening bolt 37 is made to pass through the positioning sleeve 36, the sleeve insertion hole 61 and the bolt hole 64 of the gear case body 32 and the sleeve insertion hole 65 and the bolt insertion hole 68 of the lid 35 are drilled. Processing can be performed on the same axis with a reamer, tap, or the like, and the workability can be improved.
[0027]
In the assembly procedure of the gear case 5 shown in FIG. 7, the positioning sleeves 36 and 36 are first inserted into the sleeve insertion holes 65 and 65 of the lid 35, and then the sleeve insertion holes 61 and 61 of the gear case 32. May be inserted. In short, it may be interposed between the gear case main body 32 and the lid 35.
Further, the bearing 34 may be attached to the lid 35 in advance before the gear case 5 is assembled. In short, the lid 35 may be attached before the gear case main body 32 is fastened.
[0028]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to the first aspect of the present invention, since the gear case includes the positioning sleeve, the positioning accuracy of the lid with respect to the gear case body can be improved, and the positioning accuracy of the tip of the drive shaft can be improved via the bearing provided in the lid. Can do.
[0029]
In addition, since the gear case body and the lid are separated and the lid provided with the bearing is attached to the gear case body, the bearing can be easily attached to the tip of the drive shaft, which improves the assembly of the gear case. it can.
[0030]
Furthermore, when supplying lubricating oil to the speed reduction mechanism in the gear case, the lubricating oil can be poured using the opening of the gear case main body at the time of assembly, and there is no need to provide a special oil supply hole. Since the amount of refueling per unit time can be increased, refueling can be performed in a short time, and as a result, assembly work can be performed speedily.
Therefore, the assemblability of the gear case can be improved.
[0031]
Furthermore , since one positioning sleeve is disposed on the front and rear of the center line extending substantially in the traveling direction among the center lines of the gear case, the positioning sleeve does not protrude in the width direction of the gear case. Can be small.
Therefore, the projected area from the front of the gear case can be reduced, and the running resistance due to earth and sand pushed away by the gear case during tillage can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a management machine according to the present invention. FIG. 2 is a cross-sectional view taken along arrow 2 in FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. FIG. 5 is a bottom view of the management machine according to the present invention. FIG. 6 is a perspective view of the gear case main body and the lid according to the present invention. Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Manager, 2 ... Engine, 5 ... Gear case, 21 ... Tilling shaft, 26 ... Drive shaft, 27 ... Worm, 28 ... Worm wheel, 29 ... Reduction mechanism, 32 ... Gear case main body, 33 ... Opening, 34 ... Bearing, 35 ... Lid, 36 ... Positioning sleeve, 37 ... Fastening bolt, CL ... Center line extending in the traveling direction of the gear case.

Claims (1)

This is a management machine that transmits the power from the engine to the tillage shaft through the drive shaft. The gearbox is composed of a worm provided on the drive shaft and a worm wheel attached to the tillage shaft for meshing with the worm. In the management machine that houses the mechanism ,
Before Symbol gear case includes a gear case body for supporting the middle portion of the drive shaft with supporting the cultivating shaft, an opening opened to the gear case body, and a lid having a bearing supporting the end of the drive shaft with close the opening, In order to accurately position the lid on the gear case body, a plurality of positioning sleeves interposed between the lid and the gear case body, and through the positioning sleeve to fasten the lid to the gear case body Ri Do from the fastening bolt that was,
Each of the positioning sleeves is disposed on the front and rear substantially on the center line extending in the traveling direction among the center lines of the gear case,
The two sides the cultivating shaft extends from the gear case, said gear case tiller characterized that you have the lid is attached to the lower portion of the body.

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