JPH031658Y2 - - 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 a plurality of transmission mechanisms, and each transmission mechanism is provided with a change lever. Therefore, there is a disadvantage that a large number of change levers are lined up in a row, making it easy to operate the levers incorrectly. Therefore, as described in Japanese Utility Model Application Publication No. 61-30128, a change lever that can freely rotate around an axis and swing in a plane is provided, and by rotating the change lever, the change lever can be moved through the first shifter shaft. There is also a system in which the first transmission mechanism is operated to change the speed by the user, and the second transmission mechanism is operated to change the speed through the second shifter shaft by the rocking operation of the change lever.

Problems to be Solved by the Invention By adopting the change lever described in Japanese Utility Model Application Publication No. 61-30128, the total number of change levers can be halved. However, the total number of change levers is still large.

Means for Solving the Problem A change lever is provided that is rotatable around an axis and swingable within a predetermined plane, and is connected to a first shifter shaft connected to a first transmission mechanism and a second transmission mechanism. and a connected second shifter shaft are provided with axes parallel to each other. Furthermore, a third shifter shaft is provided which is located in a plane orthogonal to these shifter shafts and is connected to a third transmission mechanism. A third drive body that drives the third shifter shaft in the gear shifting direction in conjunction with the swinging motion of the change lever, and a third drive body that drives the third shifter shaft in the shifting direction in conjunction with the swinging motion of the change lever. 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, and is linked to the rotational movement when the change lever is positioned at another predetermined rocking position. and a second drive body that drives the second shifter shaft in the speed change direction without driving the first shifter shaft in the speed change direction.

Operation By swinging the change lever, the third shifter shaft is driven in the speed change direction via the third drive body, and the third speed change mechanism performs a speed change. By rotating the change lever around its axis with the change lever positioned at a predetermined swing position, the first shifter shaft is driven in the gear shifting direction via the first driving body, or the second driving body is rotated. The second shifter shaft is driven in the gear shifting direction via the gear shifter, and gear shifting in the first transmission mechanism and gear shifting in the second transmission mechanism are selectively performed.

Embodiment An embodiment of this invention will be described based on the drawings. In a transmission case 1 of a mobile agricultural machine, a first shifter shaft 2 and a second shifter shaft 3 are provided so as to be slidable in the axial direction, with the axes oriented parallel to each other in the horizontal direction. . Further, a third shifter shaft 4 located in a vertical plane orthogonal to these shifter shafts 2 and 3 and in a plane that does not intersect with the shifter shafts 2 and 3 is provided so as to be rotatable in the vertical direction with one end as a fulcrum. There is. Note that the first shifter shaft 2 is connected to a first transmission mechanism (not shown), the second shifter shaft 3 is connected to a second transmission mechanism (not shown), and the third shifter shaft 4 is connected to a third transmission mechanism (not shown). The transmission mechanism (not shown) is connected to the transmission mechanism (not shown).

Next, the transmission case 1 is provided with a support shaft 5 having an axis parallel to the shifter shafts 2 and 3 and rotatable around the axis, and a swing boss at the tip of the support shaft 5. 6 is fixed.
A change lever 7 is fitted into the swing boss 6 so as to be freely rotatable about its axis, and to be swingable together with the swing boss 6 in the front and rear directions about the axis of the support shaft 5 . A first arm 8 which is a first driving body extending forward and a second arm 9 which is a second driving body extending rearward are fixed to the change lever 7. The arm 8 is extended to a position where it selectively engages the engaging portion 10 of the first shifter shaft 2, and the second arm 9 selectively engages the engaging portion 11 of the second shifter shaft 3. It is extended to the position. Note that when the change lever 7 is swung to the neutral position in the longitudinal direction, the first arm 8 engages with the engaging portion 10, and when the change lever 7 is swung forward or backward, the second arm 8 engages with the engagement portion 10. The shapes of the engaging parts 10 and 11 are determined so that the arm 9 engages with the engaging part 11.

A shift position display arm 12 is fixed to the change lever 7, and the tip of the shift position display arm 12 faces the shift display groove 14 of a shift display plate 13 fixed to the upper part of the transmission case 1. There is.

Next, one end of an arm 15, which is a third driving body, is fixed to the support shaft 5, and this arm 1
One end of a pin 17, which is a third drive body bent into a crank shape, is inserted into an elongated hole 16 formed along the longitudinal direction of the arm 15 at the other end of the arm 15. The other end of the pin 17 is connected to the third shifter shaft 4.

In such a configuration, when the change lever 7 is swung back and forth around the axis of the support shaft 5, this swing causes the arm 15 to move along with the support shaft 5.
, and one end of the pin 17 inserted through the elongated hole 16 moves up and down. This causes the other end of the pin 17 to rotate about the axis, and the third shifter shaft 4 rotates in the vertical direction to perform a speed change operation in the third speed change mechanism.

Next, as shown by the solid line in FIG. The second arm 9 is then disengaged from the engaging portion 11 of the second shifter shaft 3. Therefore, when the change lever 7 is rotated around the axis from this state, the first shifter shaft 2 slides in the axial direction, and a speed change operation in the first speed change mechanism is performed.

On the other hand, when the change lever 7 is swung forward or backward, the first arm 8 is disengaged from the engagement portion 10 of the first shifter shaft 2, and the second arm 9 engages with the engaging portion 11 of the second shifter shaft 3. Therefore, when the change lever 7 is rotated around the axis from this state, the second shifter shaft 3 slides in the axial direction, and a speed change operation in the second transmission mechanism is performed.

Effects of the invention Since this invention is constructed as described above, it is possible to perform gear shifting operations of three transmission mechanisms by operating one change lever, and the number of change levers can be reduced. It has the effect of being able to prevent

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a side view, and FIG. 2 is a plan view. 2...First shifter shaft, 3...Second shifter shaft, 4...Third shifter shaft, 7
...Change lever, 8...First arm (first drive body), 9...Second arm (second drive body), 15...Arm (third drive body), 17...
Pin (third driver).

Claims (1)

[Scope of utility model registration request] A change lever rotatable around an axis and swingable within a predetermined plane is provided, a first shifter shaft connected to the first transmission mechanism, and a second shifter shaft connected to the second transmission mechanism. are provided with axes parallel to each other, and a third shifter shaft is provided which is located in a plane orthogonal to these shifter shafts and is connected to a third transmission mechanism, and which moves in conjunction with the swinging operation of the change lever. a third driving body that drives the third shifter shaft in the gear shifting direction; and a third driving body that drives the second shifter shaft in the gear shifting direction in conjunction with a rotational movement when the change lever is positioned at a predetermined rocking position. A first driving body that drives the first shifter shaft in the speed change direction without being driven; a second driving body that drives the second shifter shaft in the gear shifting direction without driving the shifter shaft in the gear shifting direction.