JPS6323635Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary drive device, and more particularly to a rotary drive device with a forward/reverse switching mechanism that allows the rotary tilling member to be switched between upcut plowing and downcut plowing according to the purpose.

A rotary drive device is known in which a rotary tilling member can be switched between up-cut plowing and down-cut plowing depending on the purpose.

Conventionally, in a rotary drive device with a forward/reverse switching mechanism, a switching case with a built-in forward/reverse switching mechanism is provided on the side of a gear case with a built-in bevel gear mechanism, and the output shaft of the bevel gear mechanism is rotated through the forward/reverse switching mechanism. It was linked to the tillage member.

In this rotary drive device, the output bevel gear of the bevel gear mechanism and one bevel gear of the forward/reverse switching mechanism are supported in parallel in the axial direction. Transmission is carried out by providing an engaging part,
Coupled with the fact that the bevel gear mechanism and the switching mechanism are arranged side by side in the axial direction, the size becomes excessively large in the tilling width direction.
Furthermore, the number of parts is large, making it expensive.

The present invention was devised in view of the actual situation, and even if the bevel gear mechanism and the switching mechanism are arranged side by side in the axial direction, the output bevel gear of the bevel gear mechanism and one of the bevel gears of the switching mechanism are arranged in the axial direction. The present invention aims to provide a rotary drive device that is compact in the tilling direction by assembling it in a nested structure and supporting it via a shared bearing.Therefore, the present invention uses a bevel gear mechanism. In a rotary drive device, a switching case with a built-in forward/reverse switching mechanism is provided on the side of a gear case containing a built-in forward/reverse switching mechanism, and the output shaft of the bevel gear mechanism is linked to a rotary tilling member via the forward/reverse switching mechanism. a pair of bevel gears rotatably fitted on the output shaft, a bevel pinion meshed with the gears, and a switching shifter slidably fitted on the output shaft and detachable from the bevel gear. The cylinder boss formed on the output bevel gear of the bevel gear mechanism is inserted into the bearing fitted on the side wall of the gear case, and the cylinder formed on one bevel gear in the forward/reverse switching mechanism is inserted into the cylinder boss of the output bevel gear. The bosses are engaged in the rotational direction and inserted in the axial direction of the cylinder, and the bearing is held between the two cylinder bosses from both sides in the axial direction.Furthermore, the output shaft is inserted into the cylinder boss of the bevel gear in the forward/reverse switching mechanism. It is characterized by

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rotary tilling device, which has a rotary tilling member 2 that is rotated around a horizontal horizontal axis, and the tilling member 2 is covered with a rotary cover 3. 4 is a gear case with a built-in bevel gear mechanism, which is installed on the top of the rotary cover 3, and a switching case 5 with a built-in forward/reverse switching mechanism is attached to one side of the gear case 4; They are arranged in parallel in the width direction.

A support arm 6 is attached to the gear case 4 on the other side of the switching case 5.
A rotary cover 3 is attached to each outer end of the switching case 5 via a stay 7, and a bracket 8 protrudes forward (towards the tractor (not shown)), and a lower link is attached to each of the brackets 8. A pin 9 is provided. Note that the distances L1 and L2 between the left and right lower link attachment pins 9 with respect to the center are the same.

A downward transmission case 10 is connected to the gear case 4, and a rotary tilling member 2 is supported at the lower part of the transmission case 10, and the tilling member 2 is composed of a pawl shaft 2A and a pawl 2B attached to the pawl shaft 2A. In this example, both ends of the pawl shaft are supported by the side cover 11 etc. via bearings 12, and the pawl shaft 2A is supported by a bevel gear mechanism in the gear case 4, a switching mechanism in the switching case 5, a gear in the transmission case 10, or In this example, it is driven by a center drive system for upcut plowing and downcut plowing via a transmission mechanism such as a chain. In addition,
A transmission mechanism is provided on one side of the side cover 11, and the pawl shaft 2A is connected via a bevel gear mechanism or the like in the gear case 4.
It will be clear from the following description that a side drive system that transmits the power is also acceptable.

Referring to FIGS. 2 and 3, reference numeral 13 denotes a bevel gear mechanism, which includes a power receiving shaft 15 having a bevel pinion that is supported by the gear case 4 via a bearing 14 in a forward-protruding manner, and is engaged with the pinion of the shaft 15. The outer periphery of the cylindrical boss 16 mainly consists of an output bevel gear 18 supported by the gear case 4 via a ball bearing 17, and the rotational power from the PTO shaft of a tractor (not shown) is connected to the power receiving shaft 15 through a universal joint. The output shaft 20 is interlocked by being transmitted through a shaft or the like, and the output shaft 20 can be transmitted through a forward/reverse switching mechanism 19.

The forward/reverse switching mechanism 19 includes a pair of bevel gears 21 and 22 which are fitted onto an output shaft 20 and are arranged facing each other at an axial distance, and which are engaged with the bevel gears 21 and 22 and supported by the switching case 5 via a bearing 23. It is composed of a bevel pinion 24 and a switching shifter 25 fitted onto the output shaft 20 so as to be slidable in the axial direction via a spline, a key, etc.
can be freely engaged and disengaged from the bevel gears 21 and 22 on the output shaft 20 via the switching operation mechanism 26, and the figure shows the neutral state, and 27 and 28 are the engaged parts formed on the bevel gears 21 and 22, respectively. ,2
Reference numerals 9 and 30 indicate interlocking portions formed on the shifter 25, and the interlocking portion 29 and the interlocking portion 27 and 30 are respectively male-female and removable.

The bevel gear 18 of the bevel gear mechanism 13 and the bevel gears 21 and 22 of the forward/reverse switching mechanism 19 are located on the axis of the output shaft 20, and are attached to the outer periphery of the cylindrical boss 16 formed on the bevel gear 18 of the bevel gear mechanism 13 via a ball bearing 17. A cylindrical boss 21A supported by a bearing case portion 4A formed on the gear case 4 and further formed on one bevel gear 21 of the switching mechanism 19 is inserted into the cylindrical boss 16 in the axial direction as a so-called nested structure, and the double cylindrical boss 16, 21A is engaged in the rotational direction with an engaging part 31 such as a spline or key, and is assembled in the axial direction so that it can be freely inserted and removed.
Hold the bearing 17 from both sides in the axial direction with 6 and 21A,
Further, the output shaft 20 is inserted through the cylinder boss 21A.

A sprocket wheel 32 is fixed to the output shaft 20 in the gear case 4, and power is transmitted to the pawl shaft 2A via a chain 33, and one end of the output shaft 20 is supported by the gear case 4 via a bearing 34. ,
The other end of the output shaft 20 is rotatably fitted with a bevel gear 22 via a bushing 35.
The cylinder boss is supported by the switching case 5 via a bearing 36.

Note that the gear case 4 and the switching case 5 contain lubricating oil, and the two cases 4 and 5 are separated by fitting oil seals 37 and 38 inside and outside, respectively, at the boundary between the two cases 4 and 5. There is. Further, in FIG. 2, 39 indicates a reverse rotation display section, and 40 indicates a normal rotation display section.

In the above embodiment, the rotary tiller 1 is connected to a tractor (not shown) via a three-point linkage mechanism etc. so as to be able to rise and fall freely, and
The shaft and the power receiving shaft 15 are interlocked and connected by a universal joint shaft. By driving the power receiving shaft 15 in a fixed direction, the output bevel gear 18 is interlocked, and the spline or key formed on the inner periphery of the cylindrical boss 16 of the bevel gear 18 causes the outer periphery of the cylindrical boss 21A of the bevel gear 21 for forward and reverse rotation. Since these are engaged in the rotational direction via the engaging portion 31, the bevel gear 21 for forward and reverse rotation is rotated on the axis of the output shaft 20 together with the bevel gear 18 for output.

Therefore, the shifter 25 is
from the position shown in Figure 2 to the left in the figure to remove the occlusal part 2.
7 is engaged with the engagement portion 29 of the shifter 25, the bevel gear 21 and the output shaft 18 are connected via the shifter 25, the output shaft 20 is driven, and the wheel 32, chain 33, etc. are connected thereto. Through this, the tilling member 2 is interlocked to carry out a predetermined tilling operation.

Also, slide the shifter 25 to the right in the figure to remove the occlusal part 2.
8 engages the engagement portion 30 of the shifter 25, the bevel gear 22 rotates together with the output bevel gear 18 via the bevel pinion 24.
1, the output shaft 20 rotates in the opposite direction. Therefore, shifter 25
By sliding in the axial direction, the output shaft 20 is rotated in the forward and reverse directions, including the neutral position, through the switching mechanism 19.
During normal rotation, the tilling member 2 is driven in the downcut direction.

According to the present invention, the outer periphery of the cylindrical boss 16 of the output bevel gear 18 of the bevel gear mechanism 13 is supported by the gear case 4 by the bearing 17, and the forward/reverse switching mechanism 19
Cylindrical boss 21A formed on one bevel gear 21 of
is fitted into the cylindrical boss 16 of the output bevel gear 18 in the rotational direction through the engagement portion 31, so that the shaft can be rotated in the axial direction while increasing the amount of shaft reception and ensuring stable support. (in the tilling width direction) has the advantage of being compactly structured, and also has the advantage that the bearing 1
7 supports both the bevel gear 18 and the bevel gear 21 on the gear case 4 side, and both gears 1
8 and 21 are shared by the bearing 17, the number of parts is small and assembly and disassembly is easy, simplifying the structure. Cylinder boss 1
Since the bearings 6 and 21A are clamped from the axial direction, the bearings 17 can be used as the mounting reference for both bevel gears 18 and 21, and the gear mesh can be assembled accurately while improving the assembly accuracy. You get it.

That is, in the case of the rotary drive device shown in FIG. 4 corresponding to FIG. 2 (common parts in FIG. 4 that correspond to those in FIG. Bevel gear 18' is supported individually by bearing 17', bevel gear 21' is supported individually by bearing 17A', and the end surfaces of both gears 18' and 21' are opposed to each other, and transmission is transmitted through male and female engaging portions 31'. , it becomes excessively large in the axial direction, resulting in heavy overall weight, causing loss of horsepower and inconvenience in handling, as well as requiring an extra bearing 17A', which complicates the structure. As mentioned above, the rotary drive device of the present invention eliminates such problems.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic rear view of the rotary tilling device partially expanded, Fig. 2 is a plan sectional view of the rotary drive device of the invention, and Fig. 3
The figure is a partially enlarged view of FIG. 2, and FIG. 4 is a sectional view of a comparative example corresponding to FIG. 4... Gear case, 5... Switching case, 13...
... Bevel gear mechanism, 16 ... Cylinder boss, 17 ... Bearing, 18 ... Bevel gear for output, 19 ... Forward/reverse switching mechanism, 20 ... Output shaft, 21, 22 ... 19
Bevel gear for 24...19 bevel pinion, 25...shifter, 31...engaging portion.

Claims (1)

[Scope of utility model registration request] A switching case 5 containing a forward/reverse switching mechanism 19 is provided on the side of a gear case 4 containing a bevel gear mechanism 13 , and an output shaft 20 of the bevel gear mechanism 13 .
is interlocked with the rotary plowing member 2 via a forward/reverse switching mechanism 19, in which the forward/reverse switching mechanism 19 connects a pair of bevel gears 21, 22 rotatably fitted onto an output shaft 20, and the gear 21. ，
A bevel pinion 24 is engaged with the output shaft 22, and a bevel gear 21, 2 is slidably fitted onto the output shaft 20.
The outer periphery of the cylindrical boss 16 formed on the output bevel gear 18 of the bevel gear mechanism 13 is inserted into the bearing 17 fitted on the side wall of the gear case 4, and the output bevel gear 18 A cylinder boss 21 formed on one bevel gear 21 of the forward/reverse switching mechanism 19 is inside the cylinder boss 16 of
A is engaged in the rotational direction and inserted in the cylinder axial direction, and the bearing 17 is held between the cylinder bosses 16 and 21A from both sides in the axial direction. output shaft 2
A rotary drive device characterized in that 0 is inserted through the rotary drive device.