JPH032767Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a transmission device for mobile agricultural machinery, etc.

BACKGROUND ART Conventionally, mobile agricultural machines and the like have had a plurality of transmission mechanisms, and each transmission mechanism is provided with a change lever. Therefore, a large number of change levers are lined up. Furthermore, as described in Japanese Utility Model Application Publication No. 61-30128, there is also a system in which two transmission mechanisms are operated by one change lever.

Problems that the invention aims to solve: First, when a change lever is provided for each transmission mechanism, it is easy to accidentally operate the change levers in a row, and change levers located adjacent to each other do not operate the other change levers. This has become an obstacle to doing so. Furthermore, in the method described in Japanese Utility Model Application Publication No. 61-30128, it is not possible to correlate the speed change operations of the two speed change mechanisms, and for example, when a mobile agricultural machine moves backward, power transmission to a rotary working machine is checked. There is a disadvantage that a back check device must be separately provided for this purpose.

Means for Solving the Problem A change lever is provided which is rotatable around the axis and slidable in the axial direction, and the change lever is connected to a first shifter shaft connected to a first transmission mechanism and a second transmission mechanism. A second shifter shaft connected to the third transmission mechanism and a third shifter shaft connected to the third transmission mechanism are provided with axes parallel to each other. a third driving body that drives a third shifter shaft in the gear shifting direction in conjunction with the sliding movement of the change lever in the axial direction;
a first driving body that drives the first shifter shaft in the gear shifting direction without driving the second shifter shaft in the gear shifting direction in conjunction with the rotational movement when the change lever is positioned at a predetermined sliding position;
A second driving body is provided which drives the second shifter shaft in the gear shifting direction without driving the first shifter shaft in conjunction with the rotational movement when the change lever is positioned at another slide position.

Operation: A single change lever is used to shift the speeds of three transmission mechanisms, and to selectively shift either one of the first transmission mechanism and the second transmission mechanism. Further, when the third transmission mechanism is shifted to a predetermined transmission state, the first transmission mechanism can be shifted, and when the third transmission mechanism is shifted to another shift state, the second transmission mechanism is shifted. You can perform gear shifting operations.

Embodiment An embodiment of this invention will be described based on the drawings. Mission case 1 of mobile agricultural machinery (not shown)
Inside, a first shifter shaft 2, a second shifter shaft 3, and a third shifter shaft 4 are provided so as to be slidable in the axial direction with horizontally oriented axes that are parallel to each other. Although not shown, a first transmission mechanism is connected to one end of the first shifter shaft 2, a second transmission mechanism is connected to one end of the second shifter shaft 3, and a second transmission mechanism is connected to one end of the third shifter shaft 4. is connected to a third transmission mechanism. Further, a pair of engagement pieces 5 are fixed to the other end of the first shifter shaft 2, an engagement pin 6 is fixed to the other end of the second shifter shaft 3, and a pair of engagement pieces 5 is fixed to the other end of the third shifter shaft 4. Pin 7 is fixed. This pin 7 is connected to the transmission case 1.
It is engaged with an elongated hole 10 formed at one end of an arm 9 which is rotatably connected to the support shaft 8 around its axis.

Next, the transmission case 1 has a change lever 11 which has an axis extending horizontally in the front-rear direction and is slidable in the axial direction and freely rotatable around the axis.
is provided. The change lever 11 includes a first driving body 12 that engages with the engagement piece 5 when the change lever 11 is slid to a predetermined slide position along the sliding direction, and a first drive body 12 that engages the engagement piece 5 when the change lever 11 is slid to a predetermined slide position along the sliding direction. a second driving body 13 that engages with the engagement pin 6 when the arm 9 is moved;
A third driving body 15 is fixed thereto, with which a pin 14 fixed at the other end is always engaged. Furthermore, an instruction pin 16 is fixed to the change lever 11 to indicate the shift position of the first to third transmission mechanisms, and the upper end of this instruction pin 16 is connected to the shift lever 11 fixed to the upper part of the transmission case 1. Display board 17
is engaged with the guide groove 18 of.

In such a configuration, the change lever 11
When the shifter shaft 4 is slid in the axial direction, the arm 9 rotates around the axis of the support shaft 8 due to the sliding movement of the third drive body 15 that slides integrally with the third shifter shaft 4, and the third shifter shaft 4 is moved in the axial direction. , and the third transmission mechanism changes gears. Note that when the change lever 11 is rotated around the axis, the pin 14 does not receive any force from the third driver 15 even if the third driver 15 rotates integrally. The arm 9 is not rotated and no speed change is performed in the third speed change mechanism.

Next, when the change lever 11 is rotated around the axis from the state where it has been slid to the position shown by the solid line, the first drive body 12 that is engaged with the engagement piece 5 is moved between the engagement piece 5 and the first drive body 12. The shifter shaft 2 is slid in the axial direction to perform a speed change in the first speed change mechanism. Note that at this time, the second driving body 13
However, the second drive body 13 is in a disengaged state with the engagement pin 6, and no speed change is performed in the second speed change mechanism.

Next, when the change lever 11 is slid to the position shown by the two-dot chain line, the engagement recess 19 formed in the second drive body 13 engages with the engagement pin 6, while the first engagement body 12 moves to the disengagement position with the engagement piece 5. When the change lever 11 is rotated around the axis from this state, the second driving body slides the engagement pin 6 and the second shifter shaft 3 in the axial direction, and a speed change in the second transmission mechanism is performed. . Note that, at this time, since the first drive body 12 is in a disengaged state with the engagement piece 5, no speed change is performed in the first speed change mechanism.

Here, the third transmission mechanism is a transmission mechanism for a traveling system, the first transmission mechanism is a transmission mechanism for a rotary working machine, and the second transmission mechanism is a transmission mechanism for another working machine. In addition, when the indicator pin 16 is located at point A of the guide groove 18 due to the slide operation of the change lever 11, when the agricultural machine moves at low speed, the indicator pin 16
When the agricultural machine moves at high speed, the indicator pin 16 moves when it is located at point B of the guide groove 18.
The time when the mobile agricultural machine is located at the point is considered to be the time when the mobile agricultural machine moves backward. With the above settings, the speed of the rotary work machine will be changed only when the transmission mechanism of the traveling system is changed to a low speed state, and the rotary work machine will not be able to rotate when the mobile agricultural machine is running at high speed or when moving backwards. figure,
Improves work safety. Further, it is not necessary to separately provide a back check mechanism for the rotary work machine, simplifying the structure and reducing manufacturing costs. On the other hand, other working machines connected to the second shifter shaft 3 are driven when the mobile agricultural machine is running at high speed or when moving backward.

Effects of the invention Since this invention is constructed as described above, it is possible to perform gear shifting operations for three transmission mechanisms using one change lever, and therefore, the number of change levers can be reduced and the number of change levers can be reduced. It is possible to prevent erroneous operation caused by the change lever being in a stand-up state, and for example, the third transmission mechanism is a transmission mechanism for a traveling system, and the first transmission mechanism is a transmission mechanism for a rotary work machine. By doing so, it is possible to set the speed change operation of the rotary work equipment to be performed only when driving at low speeds, and to improve safety by regulating the rotation of the rotary work equipment when driving at high speeds or when going backwards. Furthermore, it is possible to simplify the structure by eliminating the need to separately provide a back check mechanism.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a front view, and FIG. 2 is a plan view thereof. 2...First shifter shaft, 3...Second shifter shaft, 4...Third shifter shaft, 1
1...Change lever, 12...First drive body,
13...Second driving body, 15...Third driving body.

Claims (1)

[Scope of utility model registration request] A change lever rotatable around the axis and slidable in the axial direction is provided, and includes a first shifter shaft connected to the first transmission mechanism, a second shifter shaft connected to the second transmission mechanism, and a third shifter shaft connected to the first transmission mechanism. and a third shifter shaft connected to the transmission mechanism, the third shifter shaft being provided with axes parallel to each other, and driving the third shifter shaft in the transmission direction in conjunction with the sliding movement of the change lever in the axial direction. and driving the first shifter shaft in the gear shifting direction without driving the second shifter shaft in the gear shifting direction in conjunction with the rotational movement when the change lever is positioned at a predetermined sliding position. and a first driving body that drives the second shifter shaft in the gear shifting direction without driving the first shifter shaft in conjunction with the rotational movement when the change lever is located at another slide position. A transmission device characterized in that it is provided with a second driving body.