JPH0315380Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a speed change operation for operating two speed change levers for switching between two sets of transmission mechanisms of a tractor transmission, for example, with a single operating lever. Regarding equipment.

[Prior art]

For example, special work vehicles such as tractors have many built-in transmission mechanisms such as main transmission, auxiliary transmission, super deceleration, and PTO transmission, and their operation mechanisms are complicated. Shifting and main shifting can be operated with a single operating lever.

Conventional gear shift operating devices are, for example,
As shown in Publication No. 55468, one operating lever that is pivotally supported can be freely engaged and detached from two interlocking members that are interlocked and connected to two shift levers, respectively,
By rotating the operating lever in two orthogonal directions, the interlocking member to be engaged can be selected and the engaged interlocking member can be swung.

[Problem that the invention attempts to solve]

In the conventional device described above, since the operating lever is engaged with and disengaged from the engagement recess of the interlocking member, play is likely to occur, and a shift guide plate is required to guide the operating lever to the engagement position. It is difficult to increase the rigidity because adjustments such as alignment with the guide groove of the speed change guide plate are required, and because the operating lever is shaped so that it can be freely engaged and disengaged from the engagement recess.

[Means to solve the problem]

In view of the problems of the conventional device, the present invention makes the pivoting body provided on the operating lever rotatable in two orthogonal directions, and the pivoting body has two pivoting bodies disposed on the two rotational axes. A ball joint is provided, and an interlocking member that swings the gear shift lever is connected to each of these two ball joints, making it possible to swing the two gear shift levers with one operation lever without using a locking/disengaging structure. The object of the present invention is to provide a speed change operation device that has the following features.

A feature of the present invention for achieving this purpose is that a pivoting body 24 is provided at the lower part of one operating lever 16, and a first shaft 23 rotatable in a first direction α is provided.
The pivoting body 24 is supported rotatably in a second direction β via a second shaft 25 whose axis is orthogonal to the first shaft 23, and the pivoting body 24 is rotatably supported in two directions α and β. In a speed change operation device that swings the speed change levers 14, 15 of two sets of speed change mechanisms via two interlocking members 28, 35, the pivot body 24 has two shafts 23, 25 each having rotation axes A, Two arm parts 26 and 24a are formed that protrude in substantially the same direction as B, and the first arm part 26 has a first ball that pivotally connects the first interlocking part 28 on the rotation axis B of the second shaft 25. A joint 27 is provided, and the second arm portion 24a is provided with a second ball joint 29 for pivotally connecting the second interlocking member 35 on the rotation axis A of the first shaft 23.

[Effect]

The pivot body 24 at the bottom of the operating lever 16 is connected to the first shaft 2
3 in the first direction α, the first interlocking member 28 is actuated via the first ball joint 27, and the first
The first shift lever 15 that switches the transmission mechanism of the set is swung, and at this time, the second ball joint 29 is located on the axis A of the first shaft 23, so there is no movement, and the pivoting body 24 is moved around the second shaft 25. When it rotates in the second direction β, the second interlocking member 35 is actuated via the second ball joint 29 to swing the second shift lever 14 that switches the other set of shift mechanisms. Since the one-ball joint 27 is located on the axis B of the second shaft 25, it does not move.
By rotating one operation lever 16 in two orthogonal directions, two shift levers 14 and 15 are selectively swung.

〔Example〕

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

In Fig. 2, reference numeral 1 indicates a transmission case forming the body of the tractor, which is not shown.
It has a built-in main transmission mechanism, auxiliary transmission mechanism, super reduction mechanism, front wheel drive mechanism, PTO transmission mechanism, etc., and the brake case 2 and rear axle case 3 are installed on both sides of the rear part, and the upper part is used for lifting and lowering the towing work equipment. The hydraulic devices 4 are respectively provided.

5 is a main operating lever for switching the main transmission mechanism, 6 is a front wheel operating lever that swings a front wheel drive switching lever 8 via a rod 7, etc., and 9 is a main operating lever for swinging a front wheel drive switching lever 8 via a rod 7, etc.
This is a PTO operating lever that swings the PTO switching lever 11 that switches the PTO ground/live.

The switching shaft 12 of the sub-transmission mechanism and the switching shaft 13 of the super reduction mechanism protrude laterally from the transmission case 1.
Shift levers 14 and 15 are provided at both of the shift levers 14 and 15, and both shift levers 14 and 15 are swingably operated by a single operating lever 16.

In FIGS. 1 to 5, reference numeral 20 denotes a shift operating device for sub- and super-shifting, which is supported by a box-shaped frame 21 bolted to the left side of the hydraulic device 4. The operating lever 6, 9 is also supported rotatably around the horizontal axis.

A first shaft 23 having an axis A in the front-rear direction is attached to the frame 21 via a bearing member 22 in a first direction α.
The first shaft 23 is rotatably supported, and the front end of the first shaft 23 is formed into a bifurcated shape.

A pivoting body 24 formed of a plate material is fixed to the lower part of the operating lever 16, and this pivoting body 24 is fitted into the bifurcated portion of the first shaft 23 and has a second shaft passing through the first shaft 23 in a direction perpendicular to the first shaft 23. It is supported by the shaft 25 so as to be rotatable in the second direction β.

A bracket 26 is fixed to one side of the pivoting body 24 and projects upward from the side, so that the pivoting body 24
is approximately L-shaped when viewed from the axial direction of the operating lever 16, and has an integral protrusion 24a (second arm part) and the bracket 26
(first arm part). Said bracket 2
A first ball joint 27 is provided at the tip of the shaft 6 to project backward, and its spherical center is located on the central axis B of the second shaft 25. The first ball joint 27 and the super-deceleration shift lever 15 are connected by a connecting rod 28 (first interlocking member).

The front part of the pivot body 24 is bent to one side,
A second ball joint 29 is provided at the front of the shaft and protrudes outward, the ball center of which is located on the central axis A of the first shaft 23, and the upper end of the connecting rod 30 is connected to the second ball joint 29. has been done.

An interlocking shaft 31 parallel to the second shaft 25 is supported at the lower part of the frame 21 so as to be rotatable around a horizontal axis.
Arms 32 and 33 are fixed to both ends of this interlocking shaft 31, and one arm 32 has the connecting rod 30 fixed thereto.
The other arm 33 is connected to the auxiliary gear shift lever 14 via a connecting rod 34, and the connecting rods 30, 34 and the interlocking shaft 31 are connected to each other in the second direction β of the pivoting body 24. It constitutes a second interlocking member 35 that transmits rotation to the speed change lever 14.

The lower end of the pivot body 24 has a round bar-shaped protrusion 37, and the frame 21 corresponds to this protrusion 37.
A guide body 38 is provided. This guide body 38 has a substantially trapezoidal shape when viewed from the front, with guide surfaces 3 on the left and right sides.
8a, 38b, and at the center in the front-rear direction, when the pivoting body 24 rotates in the first direction α, a second
A groove 39 is formed to prevent rotation in the direction β, so that the pivot body 24 can rotate in the first direction α when the protrusion 37 is in the groove 39, and when it protrudes from the groove 39, the pivot body 24 can rotate in the first direction α. along 38a or 38b
It is rotatable in direction β.

The guide body 38 is bolted to the frame 21 together with a support bracket 40 for the interlocking shaft 31. Incidentally, instead of the guide body 38, the operating lever 16 may be guided by a guide plate having an H-shaped groove. Reference numeral 41 shown in FIGS. 3 to 5 is a PTO clutch lever supported by the frame 21 via a shaft 42.

The speed change operation device 20 includes a front wheel operation lever 6 and
It can be attached to the tractor side after being assembled together with the PTO operating lever 9 as one unit.
Assembling and assembling becomes easy, and since it is arranged on the side of the hydraulic device 4, the arrangement of floor seats, cabins, etc. becomes easy.

[Effect of idea]

In the present invention described in detail above, the pivot body 2
4 has two arm portions 26, 24a protruding in substantially the same direction as the respective rotational axes A, B of the two shafts 23, 25.
is formed, the first arm part 26 is provided with a first ball joint 27 that pivotally connects the first interlocking part 28 on the rotation axis B of the second shaft 25, and the second arm part 24a is provided with a first ball joint 27. The second interlocking member 35 on the rotation axis A of the shaft 23
Since a second ball joint 29 is provided to pivotally connect the interlocking members 28 and 35 to the ball joints 27 and 29
It can always be connected to the pivoting body 24 without play through the lever, and there is no play between the operating lever and the interlocking member, allowing more accurate gear shifting operation and increasing rigidity. In addition, the gear shifting operation is simple and easy, and the structure can be simplified with a small number of parts.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view showing the structure of the main part, FIG. 2 is an overall side view,
Fig. 3 is a partially sectional side view, Fig. 4 is a plan view, and Fig. 5 is a partially sectional side view.
The figure is a front view. DESCRIPTION OF SYMBOLS 1...Mission case, 14, 15...Shift lever, 16...Operation lever, 20...Shift operation device, 2
DESCRIPTION OF SYMBOLS 1... Frame, 23... First axis, 24... Pivoting body, 2
5... Second shaft, 27... First ball joint, 28... Connection rod (first interlocking member), 29... Second ball joint, 35...
Second interlocking member, A, B...axis line, α...first direction, β
...Second direction.

Claims (1)

[Claims for Utility Model Registration] A pivoting body 24 is provided at the lower part of one operation lever 16, and the pivoting body 24 is connected to the first shaft 23, which is rotatable in the first direction α. is rotatably supported in a second direction β via a second shaft 25 orthogonal to each other, and two sets of speeds are changed via two interlocking members 28 and 35 by rotation of the pivot body 24 in two directions α and β. In the speed change operation device that swings the speed change levers 14 and 15 of the mechanism, the pivot body 24 has two arm portions 26 that project in substantially the same direction as the respective rotation axes A and B of the two shafts 23 and 25, 24a is formed, and the first arm part 26 is provided with a first ball joint 27 that pivotally connects the first interlocking part 28 on the rotation axis B of the second shaft 25. A speed change operation device characterized in that a second ball joint 29 is provided for pivotally connecting a second interlocking member 35 on the rotation axis A of the first shaft 23.