JPS6128132Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a temperature rise prevention mechanism for a reversing case that switches the tilling claws of a tiller between forward and reverse directions.

Conventionally, lubricating oil is injected into the reversing case of a tiller, which is equipped with a gear engagement mechanism that switches the rotation of the tilling claws between forward and reverse directions, but because the reversing case is narrow, oil tends to run out, and sometimes the gears and bearings The frictional heat caused by this caused the reversing case to become hot, causing the drive shaft to seize up.

In this design, a rotary drive shaft that transmits power from the prime mover is placed inside the drive shaft that drives the tilling claws, and the shaft centers are the same and a required gap is formed, and the rotary drive shaft is placed inside the reversing case, tilling case, and auxiliary case. The lubricating oil supplied in the reversing case is supplied into the auxiliary case through the gap between the shafts, and as the lubricating oil in the reversing case is consumed, the lubricating oil in the auxiliary case is transferred to the reversing case. The present invention provides a temperature rise prevention mechanism for a reversing case that is formed so as to supply heat to the inside of the reversing case to prevent a temperature rise within the reversing case.

Below, an embodiment of this invention will be described in detail based on the drawings. 1 is a tiller, 2 is a prime mover, 3 and 4 are transmission devices for transmitting the driving force of the prime mover 2, and 5 is a tiller transmission case. It is provided to transmit the power from the device 4 to the tilling claws 6. 9 is a tail wheel that regulates tillage depth.

The tilling case 5 has a reversing case 7 on one side and an auxiliary case 8 on the other side, and the transmission device 4
The power from the rotary drive shaft 10 is transmitted to the rotary drive shaft 10.

The rotary drive shaft 10 is horizontally suspended in communication with the auxiliary case 8, the tilling transmission case 5, and the reversing case 7, and is supported by bearings 11 and 12.

One end of the rotary drive shaft 10 is horizontally suspended in the reversing case 7, and a gear 12 is fixed to the tip of the shaft, and a sliding gear 13 fitted with a spline is loosely fitted next to this gear 12. One end 13a of 13
is slid in the axial direction by a clutch lever 24 and fitted into one end fitting portion 12a of the gear 12. 14, 15, 16 are rotary drive shafts 10
A gear 12 is a gear for changing direction to reverse rotation from a rotary drive shaft 10.
and the gear 14 fixed on the shaft 17 are connected by a chain.

On the other hand, the tillage drive shaft 2 is supported by bearings 21 and 22 with the same axis as the rotary drive shaft 10.
A gap 23 is provided between the two. Further, gears 16 and 19 are fixed on the tillage drive shaft 20, and the gear 1
A fitting part 16a into which the other end 13b of the sliding gear 13 loosely fitted onto the rotary drive shaft 10 described above is fitted is formed at one end of the tilling transmission case 5.
A gear 19 attached to the upper part of the plowing claw 6 is connected by a chain so as to drive the tilling claw 6.

Note that the gap 23 between the rotary drive shaft 10 and the tillage drive shaft 20 described above has one end 23a connected to the reversing case 7.
The other end 23b is opened into the auxiliary case 8 so that the reversing case 7 and the auxiliary case 8 communicate with each other. Reference numeral 25 indicates the oil level of the lubricating oil. Normally, the lubricating oil is supplied to the center line of the rotary drive shaft 10 in this way, and the reversing case 7 and the auxiliary case are filled with oil.

The embodiment of this invention is constructed as described above, and when the tilling claw 6 is rotated clockwise by the gear 19 fixed to the tilling drive shaft 20, the clutch lever 24 is pushed in and the sliding gear is rotated. 13
A gear 1 whose one end 13b is fixed to a tillage drive shaft 20
6 rotates the rotary drive shaft 10 clockwise, the gear 19 also rotates clockwise, causing the tilling claws 6 to rotate clockwise.

In addition, when rotating the tilling claws 6 in the reverse direction, pull the clutch lever 24 toward you to move the sliding gear 13 to the gear 1.
6, the rotation of the rotary drive shaft 10 is interlocked with the gears 12, 14, 15, and 16, causing the gear 19 to rotate counterclockwise, thereby reversing the tilling claw 6 (counterclockwise).

Incidentally, the rotary drive shaft 10 is rotated by the prime mover 2, and the gears 12, 14, 1 in the reversing case 7 are rotated.
If the lubricating oil in the reversing case 7 is consumed and reduced while rotating the auxiliary case 8
Since the lubricating oil stored therein is supplied into the reversing case 7 through the gap 23 between the shafts 10 and 20, there is no need to supply lubricating oil from the outside.

Therefore, according to this invention, it is possible to reduce the frequency of supplying lubricating oil to the reversing case 7, prevent a rise in temperature of the reversing case 7, and reduce the amount of water between the rotary drive shaft 10 and the tillage drive shaft 20. Since the reversing case 7 and the auxiliary case 8 can be connected with each other by providing a small gap between them to provide an oil supply chamber for the reversing case 7, there is no need to specially enlarge the reversing case 7, and the structure can be made relatively simple. It's practical.

[Brief explanation of the drawing]

FIG. 1 is a side view of a tiller, and FIG. 2 is a sectional view of a tilling transmission case and a reversing case showing an embodiment of the present invention. 5: Tillage transmission case, 7: Reversing case, 8: Auxiliary case, 10: Rotary drive shaft, 20: Tillage drive shaft, 23: Gap.

Claims (1)

[Scope of utility model registration request] The reversing case 7, the tilling transmission case 5, and the auxiliary case 8 are integrally joined, and the rotary drive shaft 10 is connected and installed horizontally, and the required gap 23 is formed on the outside of the drive shaft 10 with the same axis axis. The tilling drive shaft 20 is fitted onto the rotary drive shaft 10.
In the gap 23 between the tiller drive shaft 20 and the tilling drive shaft 20, the reverse case 7
A temperature rise prevention mechanism for a reversing case in a tiller, which is configured to communicate with the auxiliary case 8 and replenish lubricating oil.