JPS6011324Y2 - Transmission structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement in the structure of a transmission part in which two shafts each having a gear that engages with the other are mounted on the transmission case. It is an object of the present invention to simplify the structure for supporting the shaft and to easily change the gear ratio setting between the two shafts.

Next, embodiments of the present invention will be described based on illustrative drawings.

Wheels 4 are removably mounted on the main body of the aircraft, which is equipped with an engine 1 at the front and a control handle 2 extending rearward, via a transmission case 3, and a hitch 5 is attached to the rear of the transmission case 3. This structure constitutes a walking type mobile agricultural machine in which a rotary tiller is attached in place of the wheels 4 to form a tiller, or a working device can be connected to the rear of the machine.

To drive the wheels 4, the rotational power of the output shaft 6 of the engine 1 is introduced into the transmission case 3 through the input shaft 8 which is interlocked with the rotational power through the belt tension clutch 7, and this introduced power will be described later. The power is transmitted to the axle 9 based on the transmission structure.

As shown in FIGS. 2 and 3, the transmission section structure is composed of a gear type transmission section 10 and an Imoine type transmission section 11. Next, the gear type transmission section structure will be described in detail. .

That is, the transmission gear 12 is integrally rotatably and slidably attached to the input shaft 8, and the first transmission gear 13 that meshes with the transmission gear 12 is attached to the support shaft 1 fixed to the transmission case 3.
4 for free rotation, and the chain type transmission section 1
It is integrally and rotatably connected to the input sprocket 15 of No. 1.

A second transmission gear 16 that meshes with the transmission gear 12 is rotatably attached to a support shaft 17 that is supported on the transmission case 3, and a third transmission gear 18 that meshes with the first transmission gear 13 is attached to the transmission case 3. It is attached to the support shaft 17 so as to be able to rotate integrally with the second transmission gear 16.

Then, by pushing and pulling the shift fork shaft 19 against the transmission case 3, the transmission gear 12 is moved to the first transmission gear 13.
When the input shaft 8 is engaged with the second transmission gear 16, the rotational force of the input shaft 8 is transmitted as a forward driving force to the chain type transmission section 11. When the second transmission gear 16 is engaged with the input shaft 8, the input shaft 8 is engaged with the second transmission gear 16. The rotational force of
When located in the middle of the transmission gear 16, the chain type transmission part 1
This is to create a neutral state where the transmission of power is cut off.

The input shaft 8 and the second transmission gear support shaft 17 are connected to the transmission case 3 on both the left and right sides of the gear mounting portion based on the structure described later.
It is supported by a shaft.

That is, as shown in FIGS. 2 and 4, the transmission case 3
One elongated recess 20 is press-formed in the recess 20, and two bearings 21 and 22, which are externally fitted onto the input shaft 8 and the support shaft 17, respectively, are fitted into the recess 20.

The mounting position of the spindle side bearing 22 in the recess 20 is configured to be freely changeable in the direction of distance from and near the input shaft side bearing 21, and a bearing is installed between both bearings and between the spindle side bearing 22 and the transmission case 3. Spacers 23a and 23b for preventing displacement are provided so as to be replaceable with other spacers having different effective lengths, and the gear type transmission section 10
This makes it possible to change gears.

That is, by replacing both spacers 23 a and 23 b and changing the mounting position of the second transmission gear support shaft 17, the second transmission gear support shaft 17, the input shaft 8, and the first transmission gear support shaft 14 can be connected. By making it possible to change the distance between both axes of
transmission gear 12, and first, second, and third transmission gears 13.
This allows each of gears 16 and 18 to be replaced with other gears having different diameters, and also allows them to be engaged in a predetermined manner.

Note that the shaft support structure can also be applied to a transmission structure in which the transmission gear 12 corresponds to a mere transmission gear in which the transmission gear 12 is always engaged with the second transmission gear 16, and the transmission gear 12 is simply connected to the gear 1.
2, and the input shaft 8 is called a support shaft 8.

In addition, in such a transmission structure, the mounting positions of both support shafts may be changed; in short,
It is only necessary to make it possible to change the position of at least one of both support shafts.

In summary, the transmission structure according to the present invention consists of two support shafts 8, 17 each having gears 12, 16 that mesh with each other.
The two bearings 21 and 22 for the transmission case 3
The mounting position of at least one of the two bearings 21 and 22 can be changed in the direction of distance from the other, and
The present invention is characterized in that replaceable spacers 23a and 23b are provided between the two bearings and between the bearing 22 whose mounting position can be changed and the transmission case 3, respectively.

That is, since the bearing fitting recess 20 of the transmission case 3 for separately supporting the support shafts 8 and 17 via their respective bearings 21 and 22 is made into one elongated recess, the transmission case 3 It has become possible to simplify the structure and manufacture it advantageously both in terms of cost and work.

Furthermore, since the distance between the two support shafts 8 and 17 can be changed by replacing the spacers 23a and 23b, the gears 12 and 16 attached to the support shafts 8 and 17 can be replaced with gears of different diameters. This makes it easy to change the gear ratio,
For example, it can now be easily applied to different models with different desired transmission speeds.

[Brief explanation of drawings]

The drawings illustrate embodiments of the transmission structure according to the present invention,
Fig. 1 is a side view of the walking type mobile agricultural machine, Fig. 2 is an exploded view of the transmission mechanism, Fig. 3 is a side view of the gear type transmission section, and Fig. 4 is an exploded perspective view showing the main parts. 3... Transmission case, 8, 17... Support shaft, 12゜16... Gear, 20... Concavity, 21.22...・Bearing, 23a, 23b
······Spacer.

Claims (1)

[Scope of utility model registration request] Two bearings 21 and 22 for two support shafts 8 and 17 each having a gear 12 and 16 that mesh with each other are fitted into one elongated recess 20 formed in the transmission case 3. , at least one of the two bearings 21 and 22 is configured to be able to change its mounting position in the direction of distance from the other, and between both the bearings, and between the bearing 22 whose mounting position can be changed and the transmission case 3, respectively. To,
A transmission part structure characterized by being provided with replaceable spacers 23a and 23b.