JP2001327201A - Breather structure of rotary tilling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify breather structures installed in each of a driving gear chamber and a tilling transmission chamber in a rotary tilling apparatus, and solve the problem of oozing of lubricant from a breather hole which is a ventilation hole to the exterior, installed in a plug for oiling. SOLUTION: A ventilation hole 76 is formed in a flange 72 fixed to the end of a main beam 26 at the connecting part of the main beam 26 and a chain case 30 in the rotary tilling apparatus 3 attached to the rear part of a tractor 2 so that the ventilation hole 76 may be positioned at the upper part of an oil surface 79 at the each time of lifting and lowering of the rotary tilling apparatus 3, and a breather hole 67 is formed in the plug 66 for oiling in either of the main beam 26 or the chain case 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for simplifying a breather mechanism and eliminating leakage of lubricating oil from a breather hole in a rotary tilling device attached to a tractor.

[0002]

2. Description of the Related Art In a rotary tilling device attached to a tractor, the rotation of a PTO shaft projecting from the rear of the tractor is transmitted via a universal joint to an input shaft of a drive gear chamber provided in the rotary tilling device. The rotation direction is changed by the bevel gear from the input shaft and transmitted to the drive shaft in the beam, and in a chain case which is a tilling transmission chamber, the shaft end of the cultivation claw shaft in which the drive shaft and a plurality of cultivation claws are implanted. A transmission chain wound around a sprocket provided in a power transmission from a drive shaft to a tilling claw shaft, and a tilling claw fixed to the tilling claw shaft is configured to rotate. Technology.

[0003] In the conventional rotary tilling apparatus, lubricating oil for lubricating the gears and the chain during driving is stored in the driving gear chamber and the tilling transmission chamber, respectively. When the temperature of the lubricating oil rises or the temperature rises due to heat or the like, the gas expands in the drive gear chamber and the tilling transmission chamber, and the internal pressure increases unless the gas is released to the outside. . Therefore,
In order to prevent the internal pressure of the drive gear chamber and the tilling transmission chamber from increasing, a breather or a lubrication plug having a breather function that allows ventilation to the outside is attached to each of the drive gear chamber and the tilling transmission chamber.

[0004]

As described above, a lubricating plug with a breather, which is superior in terms of the number of parts and cost, is often mounted as a breather mechanism as described above. Leaching of the lubricating oil was a problem. In particular, in a chain case that is a tilling transmission chamber, even if a lubricating plug with a breather hole is provided above the chain case, the lubricating oil is adhered to the lubricating plug by the chain when the chain is driven and the lubricating oil adheres to the lubricating plug. Since oil oozes out, as shown in FIG. 7, even if lubricating oil is scraped up by the chain below the lubrication hole, a shielding plate or the like is attached so that the lubricating oil does not come into contact with the lubrication oil. It was a measure to prevent exudation. However, considering that lubricating oil reaches the upper part of the chain case due to the inclination of the chain case when the rotary tilling device is raised, even if a shielding plate is provided, sufficient measures will not be taken, and the shielding function will be improved. If the shielding plate is formed so as to perform lubrication, lubrication cannot be smoothly performed by the shielding plate.

[0005]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. More specifically, in the rotary tilling device attached to the rear part of the tractor, a vent hole is provided in a flange fixedly provided at an end of the main beam at a connection portion between the main beam and the chain case, and a driving gear chamber in the main beam is provided. And a cultivating power transmission chamber in the chain case, and a breather hole, which is a ventilation hole with the outside, is provided in either the main beam or the lubrication plug of the chain case.

According to a second aspect of the present invention, in the rotary tilling device attached to the rear portion of the tractor, the rotary tilling device is fixed to an end of the main beam so as to be located above an oil level when the rotary tilling device is raised or lowered. Vent holes were provided in the flanges.

[0007]

Next, an embodiment of the present invention will be described. FIG. 1 is a left side view of a rotary tilling device for a tractor employing a breather mechanism according to the present invention, and FIG. 2 is a rear sectional view of the same. FIG. 3 is a partial cross-sectional plan view of a gear box of a rotary tilling device for explaining a breather mechanism according to the present invention in detail, FIG. 4 is a cross-sectional view of a joint portion of a chain case and a main beam, and FIG. 6 is a sectional view of the chain case. FIG. 7 is a sectional view of a chain case of a rotary tilling device for a tractor employing a conventional breather mechanism.

Referring to FIGS. 1 and 2, a tilling rotary device 3 attached to the rear of a tractor 2 employing a breather mechanism according to the present invention will be described. As shown in FIG. 1 and FIG. 2, brackets 27 are fixed to left and right beams 26L and 26R provided laterally above the tilling case 21 of the rotary tilling device 3, and a lower link of the tractor 2 is attached to a front portion of the brackets 27 and 27. By pivoting the top link 50 to the upper arm 12 fixed on the gear box 16, the rotary tilling device 3 is attached to the rear of the tractor 2 so as to be able to move up and down. The PTO shaft projects from the rear of the tractor 2, and power is transmitted from the tractor 2 to the gear box 16 of the rotary tilling device 3 via the drive shaft 17 from the PTO shaft. In the gear box 16, the input shaft 18 is rotatably supported by bearings 42 and 43 to transmit power. A bevel gear 44 fixed to the input shaft 18 in the gear box 16 meshes with a bevel gear 45 fixed to the right side of the drive shaft 29, and the right end of the drive shaft 29 has a flange 85 covering the front surface of the gear box 16. A part is protruded into the gear box 16, and the protruding portion is rotatably supported by a bearing 46 by a drive bearing 54 so that the rotation of the input shaft 18 is transmitted to the drive shaft 29.

Left and right hollow beams 26L and 26R are fixedly welded to the left and right of the gear box 16, respectively, to form a main beam 26 of the rotary tilling apparatus 3. In the main beam 26, the inside of the right beam 26R and the inside of the gear box 16 are cut off by the frame 84 of the gear box 16 and are not connected, but the opening through which the drive shaft 29 passes is provided between the left beam 26L and the gear box 16. Part 8
3 is provided on the left side of the gear box 16 and connected.
The connected left beam 26L and the inside of the gear box 16 constitute a drive gear chamber 4. In FIG. 3, the gear box 1
The lubricating oil supplied from the lubrication port 66 provided in the gear 6 enters the gear box 16 through the opening 66, and the lubricating oil is stored in the left beam 26L and the drive gear chamber 4 inside the gear box 16, and The rotation of the drive shafts 44 and 45 and the drive shaft 29 are lubricated, and the cooling of the high temperature rotating part is promoted. In the main beam 26, the drive shaft 29 passes through the opening 83 of the gear box 16 and the left beam 26
L and the drive gear chamber 4 inside the gear box 16, bearings 7 are respectively provided on a flange 71 fixed to the chain case 30 and a drive bearing 54 of the gear box 16.
It is rotatably supported via 3.46.

In the tilling case 21 below the main beam 26, a cultivating claw shaft 24 in which a cultivating claw 23 is radially planted is traversed, and the right end of the cultivating claw shaft 24 is fixed to the right end of the main beam 26. The tilling claw bearing 59R screwed to the lower part of the frame 28, and the left end is rotatably supported via a tilling claw bearing 59L fixed to the chain case 30 via bearings 57, 57, respectively.

The left ends 49 and 51 of both the drive shaft 29 and the tilling claw shaft 24 are supported by a chain case 30 disposed on the left side of the rotary tilling device 3.
In the internal cultivation transmission chamber 5, the transmission chain 32 is stretched around a sprocket 52 spline-fitted to the left end 49 of the drive shaft 29 and a sprocket 53 spline-fitted to the left end 51 of the cultivation claw shaft 24. The rotation of the drive shaft 29 transmitted by the transmission chain 32 causes the tilling claw 23 fixed to the tilling claw shaft 24 to rotate, thereby tilling the field.

Here, the breather mechanism according to the present invention will be described in detail with reference to FIGS. In the rotary tilling apparatus 3, as shown in FIG. 2, lubricating oil is stored in the driving gear chamber 4 of the main beam 26 and the tilling transmission chamber 5 of the chain case 30, and the bevel gears 44 and 45, the moving chain 32 and the sprockets 52 and 53 are provided. Promotes smooth rotation of
This promotes cooling of each rotating part. The breather mechanism is gear 4
As the oil temperature of the lubricating oil increases due to the rotation of the chain 45 and the chain 32, the gas expands, and the internal pressure of the drive gear chamber 4 in the main beam 26 and the tilling transmission chamber 5 in the chain case 30 increases. In order to prevent this, the outside gas is circulated between the drive gear chamber 4 and the tilling transmission chamber 5 and the outside gas.

As shown in FIG. 3, a gear box 16 formed by screwing a lower frame 84 having a hole 83 formed on the left side thereof for penetrating the drive shaft 29 and a flange 85 having a drive bearing 54. The right and left hollow beams 26L and 26R are welded to the left and right of the
The drive shaft 29 is rotatably mounted in the drive gear chamber 4 inside the left beam 26L and the gear box 16. A lubrication port 66 for lubricating the lubricating oil is provided at a sufficiently high position of the lower frame 84 of the gear box 16 so as not to be immersed in the lubricating oil. The projection of the lubrication plug 65 is fitted to the plug receiver 68 to plug the gear box 16. The lubricating oil injected from the lubrication port 66 of the gear box 16 also flows out of the hole 83 on the left side of the gear box 16 into the left beam 26L. It will be housed in the drive gear chamber 4 formed by the left beam 26L.

The lubrication plug 65 is provided with a breather hole 67 for communicating gas with the outside.
Even if the gas expands, the gas is released to the outside from the breather hole 67 to prevent the internal pressure from rising.

The left beam 26L of the main beam 26 is welded to the flange 72 at the left end as shown in FIG. The main beam 26 and the chain case 30 are connected by screwing the flange 72 and the flange 71 welded to the upper part of the chain case 30. In addition, these flanges 7
1 and 72 form a drive bearing, and the chain case 3
Inside the boss of the flange 71 fixed to
Drive shaft 29.

At the boss of the flange 72 fixed to the left beam 26L, an oil seal 75 for sealing and preventing the lubricating oil of both the tilling transmission chamber 5 of the chain case 30 and the drive gear chamber 4 of the main beam 26 from flowing is provided. It is press-fitted. The inner lip of the oil seal 75 is in contact with the sleeve 77 pressed into the drive shaft 29. The sleeve 77 is provided to reduce the machining cost of the drive shaft 29, and enhances the machining accuracy of the press-fitting portion, and completely prevents the inflow and outflow of liquid. Further, the boss of the flange 72 fixed to the left beam 26L is also provided with a ventilation hole 76 through which gas in the drive gear chamber 4 and the tilling transmission chamber 5 flows. As shown in FIG. 5, the ventilation hole 76 is located at a position higher than the oil level 79b when the rotary tilling apparatus that moves up and down is raised and the oil level 79a when it is lowered. Therefore,
Even when the apparatus is moved up and down, the lubricating oil does not block the ventilation hole 76, and the lubricating oil does not flow out and in through the ventilation hole 76.

The inside of a chain case 30 formed by forming the two sheet metals 81 and 82 and forming them by welding around the entire circumference is a tilling transmission chamber 4, and as shown in FIG. An opening 97 for taking in and out of the opening 32 is provided.
Is screwed with a welding flange 90b. The lid 90a
Is provided with a lubrication port 69, a lubrication plug receiver 70 is welded and fixed to the lubrication port 69, and the lubrication plug 33 is plugged. The lubrication plugs 33 in the chain case 30 are provided with lubrication plugs 65 in the gearbox 16 of the main beam 26.
Are not provided. The lubricating oil supplied from the lubrication port 69 accumulates in the lower part of the tilling transmission chamber 5 in the chain case 30. However, even if the transmission chain 32 scrapes up the lubricating oil, the rotation of the rotary tilling device 3 raises and lowers the chain case 30. Is inclined and the oil level 38 changes, the oil tap 33 does not have a breather hole.
In the conventional breather mechanism shown in FIG. 7, there is no need to provide a shield plate 91 provided for preventing seepage of lubricating oil in the chain case, and it is not necessary to provide a breather hole in both the drive gear chamber and the tilling transmission chamber. The breather hole may be provided in the lubrication plug of either the main beam or the chain case. However, as shown in this embodiment, it is preferable that the breather hole is provided in the main beam where the lubricating oil is relatively little scraped up.

As described above, the drive gear chamber 4 of the main beam 26 and the tilling transmission chamber 5 of the chain case 30 are connected to the left beam 2
It communicates with a ventilation hole 76 provided in a flange 72 fixed to 6L, so that gas can flow. Accordingly, the gas in the tilling transmission chamber 5 and the drive gear chamber 4 both flows to the outside through the breather hole 67 provided in the lubrication plug 65 of the gear box 16, and the internal pressure of the tilling transmission chamber 5 and the drive gear chamber 4 increases. Has been prevented.

[0019]

The present invention is configured as described above.
The following effects are obtained. That is, as shown in claim 1, the rotary tilling device attached to the rear of the tractor,
At the connection between the main beam and the chain case, a ventilation hole is provided in the flange fixed to the end of the main beam to communicate the drive gear chamber in the main beam and the tilling transmission chamber in the chain case. Since the breather hole which is a ventilation hole with the outside was provided in the lubrication plug,
The inflation gas in the drive gear chamber and the tilling transmission chamber flows through the ventilation holes in both spaces, and is discharged to the outside from the breather hole provided in the lubrication plug in either the main beam or the chain case, so that the internal pressure increases. Can be prevented.

According to a second aspect of the present invention, in the rotary tilling device attached to the rear of the tractor, the rotary tilling device is fixed to an end of the main beam so as to be located above an oil level when the rotary tilling device is raised or lowered. Since the vent hole is provided in the flange of the rotary tilling apparatus, the vent hole is not blocked with oil even when the rotary tilling device moves up and down, and only the gas passes through the vent hole without passing the lubricating oil.

Therefore, it is possible to reliably prevent the internal pressure of the drive gear chamber and the tilling transmission chamber from increasing without using any special parts, and it is not necessary to provide a shielding plate for preventing seepage of lubricating oil from the breather hole. Therefore, the reduction in the number of parts related to the shielding plate and the simplification of assembly contribute to significant cost reduction.

[Brief description of the drawings]

FIG. 1 is a left side view of a rotary tilling device for a tractor employing a breather mechanism according to an embodiment of the present invention.

FIG. 2 is a rear sectional view of the rotary tillage device.

FIG. 3 is a partially sectional plan view of the gear box.

FIG. 4 is a cross-sectional view of a joint portion between the chain case and the main beam.

FIG. 5 is a sectional view taken along the line ZZ in FIG.

FIG. 6 is a sectional view of the chain case.

FIG. 7 is a cross-sectional view of a chain case of a rotary tilling device for a tractor employing a conventional breather mechanism.

[Explanation of symbols]

 2 Tractor 3 Rotary tillage device 4 Drive gear room 5 Tillage transmission room 26 Main beam 30 Chain case 66 Lubrication plug 67 Breather hole 72 Flange 76 Vent hole 79 Oil level

Claims (2)

[Claims] 1. A drive gear chamber and a chain case in a main beam provided at a connection portion between a main beam and a chain case of a rotary tilling device attached to a rear portion of a tractor at a flange fixed to an end of the main beam. A breather mechanism for a rotary tilling device, characterized in that a breather hole, which is a ventilation hole with the outside, is provided in a lubrication plug in either the main beam or the chain case, which communicates with a tilling transmission chamber in the inside. 2. A rotary tilling device attached to a rear portion of the tractor, wherein a vent hole is provided in a flange fixed to an end of the main beam so as to be located above an oil level when the rotary tilling device is raised or lowered. The breather mechanism of the rotary tillage device according to claim 1, wherein the breather mechanism is provided.