JPS6217862Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides first and second transmission sections that can be switched to two high and low speed gears connected in series by a series of operations of a single cross-swingable transmission lever. a first speed state in which both are in a low speed state; and a second speed state in which the first speed change section is in a high speed state and the second speed change section is in a low speed state.
a third speed state where the first speed change section is in a low speed state and the second speed change section is in a high speed state, and a fourth speed state where both of the abovementioned speed change sections are in a high speed state. The present invention relates to the structure of an operating section of a driving transmission.

Conventionally, in the above-mentioned operation section structure, as shown in FIG. 7, the guide groove 24 for the operation lever 19 is complicated, which has the disadvantage that it takes time and effort to perform a speed change operation.

The present invention aims to eliminate the above-mentioned drawbacks by simplifying the operating lever path.

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

As shown in FIG. 1, a self-propelled aircraft is equipped with a driving section 1 disposed at the front, a driving section 2 disposed behind it, and a pair of left and right rear wheels 3a, 3b that can be freely driven. At the rear, a lift arm 4 that can be driven vertically and swings freely for connecting a working device such as a rotary tiller, and a power take-off shaft 5 for transmitting power to the connected working device are attached, making it possible to perform various tasks. An agricultural tractor is constructed to connect the device to the rear of the machine so that it can be raised, lowered, and driven.

To enable the aircraft to travel at variable speeds, as shown in FIG. The signal is transmitted via the transmission 8 to the differential gears 9 of the left and right rear wheels 3a, 3b. As shown in FIG. 2, the sub-transmission device 8 includes a shift gear 11 that is slidably and integrally rotatably attached to an input shaft 10 that is interlocked with the main transmission device 7. A gear type first transmission section 8a configured to be able to switch to two high and low speeds by engaging and switching between the first gear 13 and the second gear 14 of 12, and an output shaft operatively connected to the differential device 9. A shift gear 16 attached to the intermediate shaft 15 so as to be slidable and integrally rotatable is connected to the intermediate shaft 12.
A gear type second transmission section 8b configured to be able to switch to two high and low speeds by engaging the third gear 17 and the fourth gear 18 is connected in series, and as shown in FIGS. Based on the operation section structure shown in FIG. 5, a first speed state in which both transmission parts 8a and 8b are in a low speed state, and a second speed state in which the first transmission part 8a is in a high speed state and the second transmission part 8b is in a low speed state. situation,
It is possible to shift to a third speed state in which the first transmission portion 8a is in a low speed state and the second transmission portion 8b is in a high speed state, and to a fourth speed state in which both transmission portions 8a and 8b are in a high speed state.

That is, one operation lever 19 is connected to its base by a pivot shaft 20, and a boss 21 is rotatably supported by a pivot shaft 22 that is substantially orthogonal to the pivot shaft 20. The guide 23 for the lever 19 has first and second groove portions 24a, 24b parallel to each other linearly or almost linearly, and a third groove portion parallel to both groove portions 24a, 24b. Groove portion 24
c, a fourth groove portion 2 that communicates and connects one end side of the third groove portion 24c and one end side of the first groove portion 24a;
4d, the other end side of the third groove portion 24c and the second
The guide groove 24 is provided with a fifth groove portion 24e that communicates with one end side of the groove portion 24b. Swing arms 26, 2 are attached to the rotating shaft 25 for slidingly operating the shift gear 11 of the first transmission section 8a.
7 and the first
The operating member 29, the second operating member 32 interlocked with the rotating shaft 25 via the swinging arm 26, push/pull rod 30, and swinging arm 31, and the shift gear 16 of the second transmission section 8b are slid. A third operating member 37, which is interlocked with a rotating shaft 33 for motion operation via swing arms 34, 35 and a push/pull rod 36, is connected to the first to third groove portions around the same axis P, respectively. An operating lever 19 is attached to the support shaft 22 so as to be relatively rotatable in the directions of 24a, 24b, and 24c, and is located on the first operating member 29 in the first groove portion 24a.
a notch-type first engaged portion 29a that is engaged with;
Operation lever 1 located in the second groove portion 24b
9 is provided with a notch-type second engaged portion 29b that engages,
The second and third operating members 32 and 37 have the third
A notched third or fourth engaged portion 32a or 37a is provided in which the operating lever 19 located in the groove portion 24c engages. The swing arm 2
6, 27, 31 and both push and pull rods 28, 30
, the second engaged portion 29b is connected to the fifth groove portion 24e.
When located on one end side, the third engaged portion 32a
is located on the other end side of the fifth groove portion 24e, and the first engaged portion 29a is located on one end side of the fourth groove portion 24d, the third engaged portion 32a is located on the other end side of the fourth groove portion 24e.
The first operating member 29 and the second operating member 32 are configured to be interlocked so as to be located on the other end side of the first operating member 4d.

In short, when the operating lever 19 is operated along the guide groove 24 and positioned at one end of the first groove portion 24a as shown in FIG. 6A, the first to third operating members 29, 32, 37 are both in the low speed position to achieve the first speed state, and as shown in FIG. 6B, when the first and second operating members 29, 32 are both in the neutral position and the third operating member 37 is in the low speed position, a neutral state is created, and as shown in FIG.
When positioned in the groove portion 24d, the first and second operating members 29 and 32 are both in the high speed position and the third operating member 37
is in a low speed position and the second speed state is manifested,
As shown in FIG. 6D, when located in the middle of the third groove portion 24c, the first to third operating members 29,
32 and 37 are both in the neutral position, a neutral state is created, and as shown in FIG. 6E, the fifth groove portion 24
e, the first and second operating members 29,
32 are both in the low speed position and the third operating member 37 is in the high speed position, the third speed state is achieved, and as shown in FIG. When the first and second operating members 29, 32 are both in the neutral position and the third operating member 37 is in the high speed position, a neutral state is created, as shown in FIG.
When located at one end of the second groove portion 24b, the first
All of the third operating members 29, 32, and 37 are in the high speed position so that the fourth speed state is achieved.

Incidentally, the above operation section structure can also be applied to a transmission structure in which the first and second transmission sections 8a and 8b selectively operate the high-speed and low-speed transmission belts to a tensioned state.

In summary, the present invention provides the above-mentioned operation structure for the traveling transmission, in which the first and second groove portions 24a, 24 are arranged in parallel in a straight line or almost in a straight line.
b, a third groove parallel to both groove portions 24a, 24b;
A groove portion 24c, a fourth groove portion 24d that communicates and connects one end side of the third groove portion 24c and one end side of the first groove portion 24a, and the other end side of the third groove portion 24c and the second groove portion. The guide groove 24 is made up of a fifth groove portion 24e that communicates with one end of the guide groove 24b.
A guide 23 for the operation lever 19 is provided, and the first and second operation members 29, 32 of the first transmission section 8a and the third operation member 37 of the second transmission section 8b are connected approximately coaxially around the center P. The first to third groove portions 24a, 24b, and 24c are arranged in parallel so as to be relatively swingable in the direction, and the first operating member 29 is provided with the first operating member 29.
a first engaged portion 29a that is engaged with the operating lever 19 at the groove portion 24a, and the second groove portion 2;
4b is provided with a second engaged portion 29b that is engaged with the operating lever 19, and the second and third operating members 32 and 37 are provided with a second engaged portion 29b that is engaged with the operating lever 19 at the third groove portion 24c. A third or fourth engaged portion 32a, 37a is provided, and the second engaged portion 2
9b is located at one end side of the fifth groove portion 24e, the third engaged portion 32a engages with the fifth groove portion 2.
4e, and when the first engaged portion 29a is located at one end of the fourth groove portion 24d, the third engaged portion 32a is located at the other end of the fourth groove portion 24d. A mechanism is provided in which the first operating member 29 and the second operating member 32 are interlocked so that the first operating member 29 and the second operating member 32 are located on the end side, and one end of the first groove portion 24a is placed in the first speed position and the fourth The groove portion 24d is configured to be in the second speed position, the fifth groove portion 24e is in the third speed position, and one end of the second groove portion 24b is in the fourth speed position. Because of this feature, the guide groove 24 of the operating lever 19 is simpler than before, making it possible to shift gears easily and quickly.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the operating structure of the traveling transmission according to the present invention, in which Fig. 1 is a side view of the agricultural tractor, Fig. 2 is a schematic diagram of the transmission system, and Fig. 3 is a diagram of the operating lever mounting part. 4 is a side view of the operating lever mounting portion, FIG. 5 is a rear view of the operating lever mounting portion, and FIG. 6 is an explanatory diagram showing the positional relationship between the operating lever, the lever guide groove, and the operating member. The upper part of each of , A to G shows the positional relationship between the operating lever and the lever guide groove, and the lower part shows the positional relationship between the lever and the operating member. FIG. 7 is a plan view of a conventional operating lever guide. 8a...first transmission section, 8b...second transmission section, 1
9... Operating lever, 23... Guide, 24... Guide groove, 24a... First groove portion, 24b... Second
Groove portion, 24c...Third groove portion, 24d...Fourth
Groove portion, 24e...Fifth groove portion, 29...First operating member, 29a...First engaged portion, 29b...Second engaged portion, 32...Second operating member, 32a...
Third engaged portion, 37...Third operating member, 37a...
...Fourth engaged part, P... Axis core.

Claims (1)

[Scope of utility model registration request] The first and second transmission sections 8a and 8b can be switched to two high and low speeds connected in series by a series of operations of one shift control lever 19 that can freely swing in a cross direction.
are both in a low speed state, a second speed state in which the first speed change section 8a is in a high speed state and the second speed change section 8b is in a low speed state, and a second speed state in which the first speed change section 8a is in a low speed state and the second speed change state is in a low speed state. The third transmission section 8b is in a high speed state.
This is an operating section structure of a driving transmission configured so that a fourth speed state in which both the transmission parts 8a and 8b are both in a high speed state is displayed, and the operation part structure is arranged in a straight line or in a substantially straight line. First and second groove portions 2
4a, 24b, a third groove portion 24c parallel to both groove portions 24a, 24b, and this third groove portion 24c.
A fourth groove portion 24d that communicates and connects one end side with one end side of the first groove portion 24a, and the third groove portion 2
The guide groove 24 consisting of the fifth groove part 24e that communicates and connects the other end side of the second groove part 4c and one end side of the second groove part 24b is connected to the guide 2 for the operating lever 19.
3, the first and second operation members 29, 32 of the first transmission section 8a and the third operation member 37 of the second transmission section 8b are connected approximately to the first to third groove portions around the coaxial core P. The first operation member 29 is arranged in parallel so as to be relatively swingable in the directions of 24a, 24b, and 24c.
, the operating lever 1 is inserted into the first groove portion 24a.
a first engaged portion 29a that is engaged with the operating lever 19 and a second engaged portion 29b that is engaged with the operating lever 19 at the second groove portion 24b; A third or fourth engaged portion 32a or 37a is provided in the third groove portion 24c to be engaged with the operating lever 19, and the second engaged portion 2
9b is located at one end side of the fifth groove portion 24e, the third engaged portion 32a engages with the fifth groove portion 2.
4e, and when the first engaged portion 29a is located at one end of the fourth groove portion 24d, the third engaged portion 32a is located at the other end of the fourth groove portion 24d. A mechanism is provided in which the first operating member 29 and the second operating member 32 are interlocked so that the first operating member 29 and the second operating member 32 are located on the end side, and one end of the first groove portion 24a is placed in the first speed position and the fourth The groove portion 24d is configured to be in the second speed position, the fifth groove portion 24e is in the third speed position, and one end of the second groove portion 24b is in the fourth speed position. Characteristic operating section structure of the driving transmission.