JPH0740121Y2 - Gearbox - Google Patents

Description

TECHNICAL FIELD The present invention relates to a speed change device that shifts a plurality of speed change mechanisms with a single change lever.

Conventional technology Conventionally, a mobile agricultural machine is provided with a plurality of speed change mechanisms,
There is a speed change device in which a speed change operation of these speed change mechanisms is performed by operating a single change lever. An example of such a transmission is disclosed in Japanese Utility Model Laid-Open No. 63-183612, which will be described with reference to FIGS. 3 and 4. In a mission case 1 of a mobile agricultural machine (not shown), three shifter shafts 2, 3, and 4 having horizontal and horizontal axis centers parallel to each other are provided slidably along the axial direction. A first transmission mechanism (not shown) is connected to one end of the shaft 2, and the shifter shaft 3
A second speed change mechanism (not shown) is connected to one end of the shifter shaft 4, and a third speed change mechanism (not shown) is connected to the other end of the shifter shaft 4.
Are connected. Further, a change shaft 5 having a horizontal axis in the front-rear direction is provided in the mission case 1 so as to be slidable in the axial direction and rotatable about the axis. A change lever 6 for rotating operation is integrally formed at one end of the change shaft 5.

An engaging piece 7 is fixed to the other end of the shifter shaft 2,
A driving body 8 fixed to the change shaft 5 is removably engaged with the engagement piece 7. An engaging pin 9 having a longitudinal axis is fixed to the other end of the shifter shaft 3, and a driving body 10 fixed to the change shaft 5 is detachably engaged with the engaging pin 9. Have been combined. Further, a pin 11 having a vertical axis is fixed to the other end of the shifter shaft 4, and the pin 11 is attached rotatably around a support shaft 12 having a vertical axis. An L-shaped arm 13 is engaged with an elongated hole 14 formed at one end of the arm 13. A pin 15 having a vertical axis is fixed to the other end of the arm 13, and the pin 15 is constantly engaged with a driving body 16 fixed to the change shaft 5. A guide pin 17 for indicating the shift position of each shift mechanism is fixed to the change shaft 5, and the upper end portion of the guide pin 17 is a shift indicator plate 18 fixed to the upper portion of the transmission case 1. It is engaged with the guide groove 19.

Here, when the change shaft 5 is slid in the axial direction by pulling the change lever 6 backward or pushing it forward, the arm 13 rotates around the support shaft 12,
With the rotation of 13, the shifter shaft 4 slides in the axial direction, and a shift is performed in the third shift mechanism connected to the shifter shaft 4. When the change shaft 5 is slid in the axial direction, the shifter shafts 2 and 3 are not slid in the axial direction.
Gear shifting is not performed in the first and second gear shifting mechanisms connected to.

Next, a case will be described in which the change shaft 6 is rotated about the axis by rotating the change lever 6 in the left-right direction. When the change shaft 5 is rotated around the axis from the state where the change shaft 5 is slid to the position shown by the solid line in FIG. 3, the shifter shaft 2 is rotated by the engagement of the driving body 8 and the engagement piece 7. The first gear shift mechanism connected to the shifter shaft 2 slides in the axial direction, and gear shifting is performed. On the other hand, change shaft 5
Is rotated to the position around the axis from the state of sliding to the position shown by the chain double-dashed line in FIG. 3, the shifter shaft 3 slides in the axial direction due to the engagement between the driving body 10 and the engaging pin 9. , The second shift mechanism connected to the shifter shaft 3 shifts gears.

Further, another transmission device in which a plurality of transmission mechanisms provided in the mobile agricultural machine are operated to change gears by operating one change lever will be described with reference to FIGS. 5 and 6. The same parts as those described in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted. The drive body 8 is provided at one end of the change shaft 5 extending outside the mission case 1.
A fixed body 20 is integrally formed, and a change lever 21 is rotatably attached to the tip of the connected body 20 so as to be rotatable in the front-rear direction along the axial direction of the change shaft 5. . A support plate 22 is fixed to the transmission case 1 so as to cover the upper side of the change shaft 5 at one end side. The support plate 22 is formed with a long hole 23 extending in the left-right direction through which the change lever 21 is inserted. There is.

Here, when the change lever 21 is rotated in the front-rear direction, the change lever 21 rotates about the elongated hole 23 as a fulcrum as shown by the chain double-dashed line in FIG. The shaft 5 slides in the front-rear direction, and the third transmission mechanism connected to the shifter shaft 4 shifts gears.

Next, when the change lever 21 is rotated in the left-right direction, the change lever 21 moves along the long hole 23 as shown by the chain double-dashed line in FIG. 6, and the change shaft 5 rotates about the axis. , The first speed change mechanism connected to the shifter shaft 2 or the second speed change mechanism connected to the shifter shaft 3 performs the speed change.

Problems to be Solved by the Invention In the transmission shown in FIGS. 3 and 4, when the change shaft 5 is slid to change the speed of the third transmission mechanism connected to the shifter shaft 4, the change lever 6 is changed. The applied force is directly transmitted to the shifter shaft 4 without being boosted by "leverage" or the like, and the shifter shaft 4
Is sliding. Therefore, a very large force is required when shifting the third transmission mechanism connected to the shifter shaft 4. Further, when the change shaft 5 is slid, it is difficult to smoothly slide the change shaft 5 when unfamiliar because the point of applying force to the change lever 6 and the axial center of the change shaft 5 are different. Is.

Next, in the transmission shown in FIGS. 5 and 6, when the change lever 21 is rotated forward, the change shaft 5 slides backward and the guide pin 17 integrally moves backward. When the change lever 21 is turned rearward, the change shaft 5 slides forward and the guide pin 17 integrally moves forward. In this way, the operating direction of the change lever 21 and the moving direction of the guide pin 17 are opposite to each other, so that the gear shifting operation may be erroneous.

Means for Solving the Problems A change shaft that is connected to a plurality of speed change mechanisms and is rotatable about an axis and slidable in an axis direction,
A change lever for rotating and sliding the change shaft is provided, a support body having an arc-shaped elongated hole centered on the axis of the change shaft is provided, and the movable body is movable along the elongated hole. A first fulcrum portion provided with a body and rotatably connecting the change lever to the change shaft along the axial direction of the change shaft; and an end of the change lever connected to the moving body by a shaft of the change shaft. And a second fulcrum portion pivotally connected along the axial direction.

Action When the change lever is rotated along the axis of the change shaft, the change lever rotates about the second fulcrum, and the change shaft slides along the axis, so that the change shaft slides. Gear shifting is performed in the gear shifting mechanism that is switched according to. Also, when the change lever is rotated in a direction orthogonal to the axis of the change shaft, the change lever rotates together with the change shaft with the first fulcrum portion as a fulcrum, and the moving body moves along the elongated hole to change. Gear shifting is performed by the gear shifting mechanism that is switched in accordance with the rotational movement of the shaft.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2. The same parts as those described in FIGS. 3 to 6 are designated by the same reference numerals, and the description thereof will be omitted. A connecting body 20 is fixed to one end of a change shaft 5 extending out of the mission case 1. A first speed change mechanism is connected to the change shaft 5 via a drive body 8, an engagement piece 7 and a shifter shaft 2, and a drive body 10 and an engagement pin 9 are connected.
And the shifter shaft 3 are connected to the second speed change mechanism, and the driver 16, the pin 15, the arm 13, the pin 11 and the shifter shaft 4 are connected to the third speed change mechanism. A support 24 is fixed to the mission case 1 below the connecting body 20, and the support 24 has an arc-shaped elongated hole 25 centered on the axis of the change shaft 5. Is formed, and the movable body 26 is movably engaged with the elongated hole 25 along the elongated hole 25.

Next, a change lever 27 for sliding the change shaft 5 in the axial direction and rotating the change shaft 5 around the axial center is provided. Here, the change lever 27 is formed with an elongated hole 28 along the longitudinal direction of the change lever 27, and the elongated hole 28 and the round hole (not shown) formed in the connecting body 20 are bolted. Insert nut 29
The change lever 27 is rotatably connected to the connecting body 20 along the axial direction of the change shaft 5 by a first fulcrum portion 31 in which 30 is screwed.

Further, a bolt 32 is inserted into a round hole (not shown) formed in the lower end of the change lever 27 and a round hole (not shown) formed in the moving body 26, and a nut 33 is screwed into the round hole. The second fulcrum portion 34 allows the change lever 27 to move to the moving body.
The change shaft 5 is rotatably connected to the change shaft 5 along the axis thereof.

In such a structure, when the change lever 27 is rotated in the front-rear direction along the axis of the change shaft 5,
The change lever 27 rotates in the front-rear direction with the second fulcrum portion 34 as a fulcrum, and the change shaft 5 slides in the front-rear direction along the axis. Then, as the change shaft 5 slides, the arm 13 rotates around the support shaft 12, and the third transmission mechanism connected to the shifter shaft 4 shifts gears. Here, when the change lever 27 is rotated in the front-rear direction, the change lever 27 rotates about the second fulcrum portion 34 as a fulcrum, and the change shaft 5 connected to the first fulcrum portion 31 becomes Since it slides by receiving the "leverage", the change shaft 5 can be slid with a small force. Further, since the forward / backward rotational operation direction of the change lever 27 and the forward / backward moving direction of the guide pin 17 coincide with each other, erroneous operation of the change lever 27 is prevented.

Next, when the change lever 27 is rotated in the left-right direction orthogonal to the axis of the change shaft 5, the change lever 27 is rotated.
Rotates about the first fulcrum 31 as a fulcrum, the change shaft 5 rotates about the axis, and the moving body 26 moves along the elongated hole 25. And change shaft 5
The drive bodies 8 and 10 are integrally rotated in accordance with the rotating operation of the gear shifter, and a shift is performed by the first shift mechanism connected to the shifter shaft 2 or the second shift mechanism connected to the shifter shaft 3. . Here, when the change lever 27 is rotated left and right, the change lever 27 moves to the change shaft 5
In addition, the shifter shafts 2 and 3 which are driven by the driving bodies 8 and 10 which are extended from the change shaft 5 in the radial direction and which are rotated with the first fulcrum portion 31 as a fulcrum slide under the "leverage action". The change shafts 2 and 3 can be slid with a small force.

Advantageous Effects of Invention The present invention has the first fulcrum portion and the second fulcrum portion as described above to connect the change lever and the change shaft to each other, so that the change lever is arranged along the axial direction of the change shaft. When the rotation operation is performed, the change lever rotates about the second fulcrum part apart from the axis of the change shaft as a fulcrum and the change shaft slides in the axis direction. It can be done with a small force by using ". Also, the movement of the guide pin for displaying the gear shift position attached to the change shaft because the rotation operation direction of the change lever and the slide direction of the change shaft match. The direction of the change lever can be made to coincide with the rotation operation direction of the change lever, and therefore, erroneous operation of the change lever can be prevented. It has the effect of being able to.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a side view, FIG. 2 is a front view, and FIGS. 3 and 4 are conventional examples. Figure is side view, Figure 4 is plan view,
5 and 6 show another conventional example, FIG. 5 is a side view, and FIG. 6 is a front view. 5 ... Change shaft, 24 ... Support, 25 ... Oblong hole, 26 ... Moving body, 27 ... Change lever, 31 ... First fulcrum part, 34 ... Second fulcrum part

Claims (1)

[Scope of utility model registration request] 1. A change shaft which is connected to a plurality of speed change mechanisms and is rotatable about an axis and slidable in an axis direction, and a change lever for rotating and sliding the change shaft. A support body having an arcuate elongated hole centered on the axis of the change shaft is provided, and a movable body movable along the elongated hole is provided, and the change lever is attached to the change shaft. A first fulcrum part that is rotatably connected along the axial direction, and a second fulcrum part that has one end of the change lever rotatably connected to the movable body along the axial direction of the change shaft. A transmission that is provided with.