JPS6145397Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating structure for a double tension clutch that changes speed by selectively operating two transmission belts with different transmission ratios.

Conventionally, in the above operation structure, both transmission belts are operated by one operating tool, and the operating tool is operated at two positions, one in the cutting position and one in the entering position.
The operation tool can be operated only in one operating position, and both transmission belts enter the operating tool separately.
1 where both transmission belts are cut
In order to prevent erroneous operations such as inserting and operating the transmission belt into a different direction than the intended one, as in the case where the operation is made possible in a total of three operation positions (each cutting position), it is necessary to 1 on the supporting member
The tensioning device is configured to attach two tensioning tools, and to change the direction in which the tensioning tools are attached to the support member so that the tensioning tools can act alternatively on both transmission belts. In this case,
This is because all of the reaction force of the transmission belt acts on the joint between the tensioning tool and its support member, and it is also necessary to prevent the mounting position of the tensioning tool from changing unexpectedly due to vibrations of the transmission belt, etc. , it became necessary to make the mounting structure of the tensioning tool extremely superior in support strength and posture holding accuracy, which made it difficult to manufacture an interlocking structure between the tensioning tool and the operating tool, and had the disadvantage of increasing costs. .

The purpose of this invention is to provide a device that can operate both power transmission belts with one operating tool without causing the above-mentioned erroneous operations, both from the viewpoint of the interlocking system between the tensioning tool and the operating tool, and from the viewpoint of the mounting structure of the operating tool. The purpose is to make it easy and inexpensive to manufacture.

The characteristic configuration of the operating structure of the double tension clutch according to the present invention is that two tensioning tools that enter and cut two transmission belts with different transmission ratios separately are supported by a member connected to the machine body. and a mechanical interlocking mechanism between the tension applying tool and one first operating tool is equipped with an interlocking switching tool for selectively interlocking the first operating tool with both of the tension applying tools, The second operating tool for the interlocking switching tool is attached to the spindle of the first operating tool.

In other words, since the two tensioning tools are selectively linked to one operating tool, it is possible to insert and cut both transmission belts with one operating tool, and it is also possible to operate both transmission belts with one operating tool. It is only necessary to allow operation to a total of two operation positions, the position and one cutting position, and the above-mentioned erroneous operation does not occur.
However, since the tensioning tool is supported by a member connected to the fuselage, it is necessary to firmly support the tensioning tool by the fuselage to prevent the mounting position from changing unexpectedly due to the reaction force or vibration of the transmission belt. Therefore, the interlocking structure of the tension applying tool and the operating tool is designed to be relatively light and small, and with relatively high manufacturing accuracy and assembly accuracy, so that the tension applying tool side member and the operating tool side member may move slightly relative to each other. It is now sufficient to use a member that can reliably transmit operating force even if it is low in weight. Furthermore, since the second operating tool is attached to the support shaft of the first operating tool, this support shaft can be effectively used as a support member for the second operating tool, and the structure of the operating tool mounting portion can be simplified. Overall, it has become easy and inexpensive to manufacture both the interlocking structure of the tension applying tool and the first operating tool and the structure of the operating tool attachment part.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a self-propelled aircraft is equipped with a drive wheel 1 that can be freely steered, an engine 2 mounted in front of the drive wheel 1, a driver seat 3, etc. At the rear of the self-propelled aircraft, A pair of left and right sliding ground rods 4, 4 that support the machine body are attached so that they can be freely swung up and down by a hydraulic cylinder 5, and a seedling planting device 6 is connected in a drivable manner to swing the ground rods 4. This is a four-row type riding rice transplanter that can be operated to adjust the planting depth by swinging the self-propelled body around the axle.

As shown in FIG. 2, the output shaft 2a of the engine 2
and the input shaft 7a of the gear transmission 7 for the wheel 1, two transmission belts 8 and 9 are wound with different transmission ratios, and the roller 10a or 11a is wound around the belt 8 or 9. Two arm-type tensioning tools 10 and 11, which insert and cut the belts 8 and 9 separately by pressing them against each other or separating them, are attached to a support shaft 14 connected to the machine frame 12 via a bracket 13. Separately swingable mounting, mop, double tensioning tool 1
0 and 11 are selectively entered and operated to sub-shift the transmission rotational speed to the wheel 1 into two high and low stages, and
A double belt tension clutch is constructed in which both the tension applying tools 10 and 11 are in the disengaged state to bring the transmission disengaged state when the transmission 7 is shifted. The operating structure of this clutch is constructed as shown in FIGS. 2 to 4.

That is, each of the tension applying tools 10 and 11 is provided with a tension spring 15 or 16 for urging it to the cutting position. One lever-type first operation tool 17 is rotatably fitted into a cylinder support shaft 18 fixed to the body frame 12 with a support portion 17a provided at one end thereof, so that the cylinder shaft 18
It is installed so that it can be oscillated between two operating positions: one off position (OFF) and one on position (ON). Then, the first operating tool 17 slides and urges the support shaft portion 17a to the side away from the cylinder support shaft 18 by means of a coil spring 19, and a rotary member attached to the support shaft portion 17a so as to be integrally rotatable with a connecting pin 20. A cam mechanism 22 is provided between the cam 21 and the cylinder support shaft 18 for slidingly operating the support shaft portion 17a in cooperation with the spring 19 as the first operating tool 17 is swung. An interlocking switching tool 23 for selectively interlocking the tension applying tools 10 and 11 with the support shaft 17a is rotatably attached to the support shaft 17a by the cylindrical boss 23a, and the anti-tension applying tool acting section 23b is on the high speed side. When the supporting shaft part is attached to the position protruding toward the tension applying tool 10, the rotating cam 21 and the tension applying tools 10 and 11 are moved to the inserted position as the supporting shaft part 17a slides toward the clutch. It is pressed toward the clutch side via the biasing coil spring 24 and becomes the high-speed transmission position H in which the high-speed side tension applying device 10 is pressed to the engaged position, and the operating portion 2
3b is placed in the supporting shaft attachment position in which it protrudes toward the low-speed side tensioning tool 11, the supporting shaft 17a
As it slides toward the clutch, it is pressed toward the clutch via the rotary cam 21 and the spring 24, and the low-speed tension applying tool 11 is pushed to the engaged position, so that the low-speed transmission position L is reached. Therefore, the switching operation of the tension applying tools 10 and 11 to be linked is performed so that both tension applying tools 10 and 11 are selectively linked to the first operating tool 17, and the rotation of the interlocking switching tool 23 is performed. A mechanical interlocking mechanism 25 is configured to perform this operation. A second operating tool 26 for operating the interlocking switching tool 23 is rotatably attached to the tube support shaft 18, and is rotatably attached to the tube support shaft 27 fixed to the body frame 12. A gear portion 26a of the second operating tool 26 is attached to one end side of the rotating shaft 28 attached to the
The second operating tool 26 and the interlocking switching tool 23 are interlocked by providing a pinion gear 29 that engages with the gear part 23c of the interlocking switching tool 23 and a pinion gear 30 that engages with the gear portion 23c of the interlocking switching tool 23 rotatably provided on the other end thereof. let, second
By rotating the operating tool 26 approximately 180 degrees,
The interlocking switching tool 23 is configured to switch between the high-speed transmission position H and the low-speed transmission position L.

In short, by rotating the second operating tool 26 and rotating the interlocking switching tool 23 between the transmission positions H and L, switching between high and low speeds is performed.
The tension applying tool 10 is operated by swinging the operating tool 17.
Alternatively, the switch 11 can be turned on and off by swinging.

Note that the elastic stopper 31 shown in FIG.
This is for locking and holding the operating tool 26 at a high speed position or a low speed position.

[Brief explanation of the drawing]

The drawings show an embodiment of the operating structure of the double belt tension clutch according to the present invention, in which Fig. 1 is an overall side view of a riding rice transplanter, Fig. 2 is a front view of the clutch, and Fig. 3 is a sectional view of the interlocking mechanism. , FIG. 4 is a cross-sectional view taken along the - arrow in FIG. 3. 8, 9... Transmission belt, 10, 11... Tension imparting tool, 12... Body, 14... Support member,
17...First operating tool, 18... Support shaft, 23... Interlocking switching tool, 26... Second operating tool.

Claims (1)

[Scope of utility model registration request] Two tensioning tools 1 that enter and cut the two transmission belts 8 and 9 with different transmission ratios separately.
0 and 11 are provided in a state supported by a member 14 connected to the body 12, and a mechanical interlocking mechanism 25 between the tension applying tools 10 and 11 and one first operating tool 17 is provided with the first operating tool 17. Equipped with an interlocking switching tool 23 for selectively interlocking the tool 17 with both the tension applying tools 10 and 11, the interlocking switching tool 2
3, the second operating tool 26 for the first operating tool 1
The operating structure of the double belt tension clutch is characterized in that it is attached to the support shaft 18 of 7.