JPH0714689Y2 - Operating lever support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a support structure for an operating lever applicable to a mobile agricultural machine such as an agricultural tractor. More specifically, the present invention comprises an inner shaft and an outer shaft connected to the operating lever. The present invention relates to a support structure for an operating lever in which a rotary shaft of a heavy shaft structure is supported laterally of a case through a holder.

[Prior art]

In this type, a holder fixed to the side of the mission case is rotatably supported by a rotary shaft having a double shaft structure composed of an outer rotary shaft and an inner rotary shaft. Each operation lever is provided on the part that protrudes outward from the holder,
The inner lever is fixed to the portion of the double-rotating shaft projecting into the case, and the inner lever is connected to each fork via the connecting rod. It is proposed by Japanese Laid-Open Patent Publication No. 57-34022.

[Problems to be solved by the invention]

By the way, in order to prevent the double rotation shaft from bending due to the operation of the operation lever and to maintain the rigidity of the double rotation shaft, it is necessary to increase the length of support of the double rotation shaft by the holder. is there.

However, when the axial length L of the double rotation shaft is made longer than the width H (inner width) of the mesh case 2, conventionally, a holder incorporating the double rotation shaft is attached to the side wall of the case from the outside. After that, the speed change lever is assembled to the outer shaft end of the double rotation shaft, and the shaft end side of the double rotation shaft protruding into the case is
Since each inner arm is fixed inside the case and each rod is connected to each inner arm, it takes time to assemble inside these cases and There is a problem that it is troublesome to take out the parts when they fall into the case.

Therefore, in consideration of the above-mentioned conventional circumstances, the present invention was devised to solve the problem, and the double rotation shaft is inserted from the inside of the case toward the outside to assemble the inside of the case. The purpose of the present invention is to provide a support structure for an operating lever that can be reduced in number to shorten the assembly time.

[Means for solving problems]

The present invention to achieve the above object is to fix a holder, which is fitted to the insertion hole provided in the case from the outside, on the side of the case, and is rotatably supported by the holder rather than the width of the case. The rotating shaft of the double shaft structure formed to have a long axial length is connected to the coaxial operation lever located outside the holder, and the other is fixed to the inner side of the shaft inside the case. It is connected to a shift fork via a rod connected to an arm, and the insertion hole has a diameter that allows the rotation shaft to be inserted obliquely from the case opening.

[Action]

The present invention is configured as described above, and the holder is configured to be fitted into the insertion hole provided in the mission case from the outside, and the rotation shaft of the double shaft structure is inserted in the insertion hole obliquely from the case opening. Since it can be inserted, even if the shaft length is configured to be longer than the width of the mission case, the rotating shaft of the double shaft structure in which the rod is connected in advance through the inner arm is inserted into the insertion hole from the inside of the case to the outside. It can be installed by inserting it in a diagonal direction. Therefore, the assembling work for attaching the inner arm and the rod to the rotating shaft in the mission case is not necessary, and the assembling time can be greatly shortened.

〔Example〕

Hereinafter, the drawings showing the present invention as an embodiment will be described.

In FIG. 2, a mesh case 2 of the agricultural tractor 1 is shown.
Inside, for example, an auxiliary transmission mechanism 3, a differential mechanism 5 for driving the rear wheels 4, and a PTO shaft transmission mechanism 7 for shifting the PTO shaft 6 are arranged in that order from the front to the rear,
The PTO shaft speed change mechanism 7 is provided with shift forks 9 and 10 for sliding a speed change gear (not shown) slidably on a shift rail 11, and both shift forks 9 and 10 are centered on a neutral position. It is provided at the gear shift position before and after the change.

Both shift forks 9 and 10 swing around a rotary shaft of a double shaft structure below a driver's seat 32 via a connecting rod outer rod 12 and an inner rod 13 of a double rod structure extending forward. Each of them is individually connected to the side operation lever 14. In other words, the front shift fork 9 is the outer rod 12
The rear shift fork 10 is connected to one end of an inner rod 13 that fits into an inner hole formed in the outer rod 12 along the axial direction. The other ends of the inner arms 1 and 13 are fixed to a rotary shaft of a double shaft structure laterally supported by the case 2
It is pivotally connected to 7 and 19, respectively. The rotating shaft of the double shaft structure is composed of a cylindrical outer rotating shaft 15 and an inner rotating shaft 16 that is rotatably fitted to the outer rotating shaft 15. An inner arm 17 is fixed to the shaft end side of the shaft 15, and an inner arm 19 is fixed to the shaft end of the inner rotating shaft 16.

A reverse boss 20 provided at the base end of the operating lever 14 is attached to a rotary boss 20 rotatably fitted on the inner rotary shaft 16 via a bearing 21.
By connecting the V-shaped rotation support portion 22 with the bolt 23, the operation lever 14 is configured to be swingable in the direction along the axis of the rotation shaft 15 about the bolt 23. But,
The urging force of a spiral spring 24 mounted together with a mounting bolt 23 between the rotative boss 20 and the rotative support portion 22 always causes the rotative shaft.
It is held at the neutral N position orthogonal to the axial direction of 16. A double nut 23a is screwed into the shaft end of the mounting bolt 23.

Further, the spline portion provided at the outer shaft end of the outer rotating shaft 15 is provided with an inner engaging arm 25 having a boss portion 25a spline-fitted therein and an engaging groove 25b for engaging the operation lever 14 at the tip. The fixed arm 26 is fixed to the outer side of the rotary boss 20 of the inner rotary shaft 16 by a spring pin 26a.
An outer engagement arm 27 is superposed on the fixed arm 26 so as to be positionally fixed. That is, the outer engagement arm 27 provided with the elongated hole 29 extending in the rotation direction of the inner rotation shaft 16 is the mounting bolt.
Although 29a is screwed into the screw hole 26b provided in the fixed arm 26 through the long hole 29, it is polymerized and fixed to the fixed arm 26,
In this overlapping state, the hole 27a provided below is fitted into the shaft end of the inner turning shaft 16, so that movement adjustment can be performed within the range of the long hole 29 around the axis of the inner turning shaft 16. The outer engagement arm 27 is provided at its tip with an engagement groove 27b that engages with the operation lever 14. A bush 15a for supporting the inner rotating shaft 16 is press-fitted on the inner engaging arm 25 side of the outer rotating shaft 15.

The outer rotation shaft 15 is rotatably supported by the inner hole portion of the holder 30 positioned in the insertion hole 31 of the case side wall 2a. The holder 30 includes the inner arm 17 and the inner engagement arm 25. It is configured to have a length located between the boss portion 25a and
The mounting seat 30a is fixed to the case side wall 2a by a mounting bolt 30b.

Further, the operation lever 14 is projected obliquely forward from a hole 34 provided in the cover 33 below the driver seat 32, and the hole 34 is closed by a guide guide 35 attached to the cover 33.
The operating lever 14 is an H-shaped guide hole 35a provided in the guide guide 35.
You can operate along. Grip the tip of this operating lever 14
14a is attached.

In the above-mentioned structure, the present invention is configured such that the shaft length L of the rotating shaft composed of the outer rotating shaft 15 and the inner rotating shaft 16 of the double shaft structure is longer than the width H of the mission case 2. However, the insertion hole 31 provided in the case side wall 2a is configured such that the rotation shaft of the double shaft structure has a hole diameter D that allows the rotation shaft to be inserted obliquely from the case opening 2b. Therefore, when the rotary shaft of the double shaft structure is incorporated in the case 2, the outer and inner rods 1 of the double structure are attached to the shaft end side inside the case 2 as shown in FIG.
Insert the tip 16a of the inner rotary shaft 16 that faces downward from the case opening 2b by inclining the rotary shaft of the double shaft structure having 2, 13 obliquely so that the outer and inner rods 12, 13 are on the upper side. After inserting into the hole 31, by inserting in the direction of arrow C, the width H can be inserted from the inside into the case 2 whose width H is narrower than the axial length L as shown by the chain double-dashed line.

By mounting the rotary shaft of the double shaft structure including the outer rotary shaft 15 and the inner rotary shaft 16 in this way from the inside of the case 2 to the outer side, the outer rotary shaft 15 and the inner rotary shaft 16 are attached. Case 2
Inner arms 17 and 19 can be fixed in advance on the side of the shaft, which is the side, and one ends of the inner rod 13 and the outer rod 12 can be connected to the inner arms 17 and 19, respectively.

The insertion hole 31 having a diameter D that allows the rotary shaft of the double shaft structure to be inserted diagonally from the case opening 2b is closed by inserting the insertion portion 36 provided in the holder 30 from the outside of the case 2. However, the holder 30 can be inserted from the outside while stabilizing its inner hole portion on the outer peripheral portion of the outer rotating shaft 15 protruding outward from the case 2. After the holder 30 is fixed to the case side wall 2a via the mounting seat 30a with the mounting bolt 30b, the inner engaging arm 25 is inserted into the outer shaft end side of the outer rotating shaft 15, and then the inner rotating shaft 16 is rotated. Moving boss 20, fixed arm 26
Is inserted and fixed by the spring pin 26a and the outer engagement arm 27 is attached to the fixed arm 26, so that the outer shaft end side of the outer rotary shaft 15 and the middle rotary shaft 16 of the double shaft structure is The operation lever 14 and the inner / outer engagement arm 2 with which the operation lever 14 engages
5, 27 can be assembled on the outside of the case 2.

In the above operation, the operation lever 14 is tilted in the direction of arrow A about the bolt 23 as a fulcrum, and the engagement with the engagement groove 27b is released.
After engaging only with 5b, by moving upward or downward around the axis of the outer movable shaft 15, the operating torque of the operating lever 14 is changed from the outer rotating shaft 15 to the inner arm 17 to the inner rod 13.
The shift fork 10 can be shifted forward or backward. Further, after the operation lever 14 is tilted in the direction of the arrow B, the engagement with the engagement groove 25b is disengaged, and only the engagement groove 27b is engaged, then the operation lever 14 is moved upward or downward around the axis of the inner rotation shaft 16. The operating torque of the operating lever 14 is
16 → inner arm 19 → transmitted to the outer rod 12, the shift fork 9 can be shifted forward or backward.

Further, by providing the large-diameter portion 37 at the center portion in the longitudinal direction in the inner hole of the holder 30, it is possible to form the support surface that supports both sides of the outer rotation shaft 15 at both ends of the holder 30. Since the support surfaces on both sides provided on the holder 30 are close to both the engaging arms 25, 27 and the inner arms 17, 19, it is possible to prevent the bending of both the rotating shafts 15, 16 that occur during a gear shift operation. The rotation can be done smoothly.

Further, the inner arm 19 fixed to the inner shaft end of the case 2 of the inner rotating shaft 16 and the inner arm 17 fixed to the inner end of the case 2 inner shaft of the outer rotating shaft 15 have a double shaft shown in FIG. By connecting to the shift forks 9 and 10 through the rods 12 and 13 of the structure, even if the diameter of the inner rod 13 is reduced, the outer rod 12 can prevent the inner rod 13 from bending during operation. There is an advantage that it can be connected to the shift forks 9 and 10 by avoiding interference with other members due to the linear double rod structure that becomes a space, but it is produced at the mounting distance E of the outer rod 12 or the mounting distance F of the inner rod 13. Even if an error occurs or a production error occurs in the mounting angle of the inner engagement arm 25, the fixed arm 26, etc., these errors are
The outer engagement arm 27 can be absorbed by adjusting the movement of the outer engagement arm 27 around the inner rotation shaft 16 with respect to the fixed arm 26 through the long hole 29.

As described above, the outer rotary shaft 15 and the inner rotary shaft 16 are connected to both engaging arms 2
Although the example in which it is connected to the single operation lever 14 via 5 and 27 has been described, the present invention separates the outer rotating shaft 15 and the inner rotating shaft 16 from each other without using the engaging arms 25 and 27. It can also be applied to the structure connected to the operating lever.

[Effect of device]

As described above, according to the present invention, a holder which is fitted to the insertion hole provided in the case from the outside is fixed to the side of the case, and the holder is rotatably supported by the holder. One of the rotating shafts of the double shaft structure formed to have a longer axial length is connected to a coaxial operation lever located outside the holder, and the other is fixed to the shaft end side in the case. The shaft is longer than the width of the mesh case because it is connected to the shift fork via the rod connected to each inner arm, and the rotation shaft has a hole diameter that allows the rotation shaft to be inserted obliquely from the case opening. Insert the double rotation shaft, which is also long, into the insertion hole with a diameter that allows the rotation shaft of this double shaft structure to be inserted diagonally from the case opening, in an oblique direction outward from the inside of the case. By doing the inside of the case It can be inserted.

For this reason, since the rotating shaft of the double shaft structure in which the rod is still connected to the inner arm fixed to the inner shaft end side of the case can be incorporated from the inside of the case toward the outside, the assembly in the case is minimized. Can be

Therefore, the assembly time can be significantly shortened.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a vertical side view of a main portion, FIG. 2 is a schematic side view of an agricultural tractor showing only the main portion broken, and FIG. 3 is an exploded perspective view. FIG. 4 is a perspective view of an outer rod and an inner rod connected to a rotary shaft of a double shaft structure via an inner arm, and FIG. 5 is an operation explanatory view. 2 ... mission case, 2b ... case opening, 9, 10 ... shift fork, 12 ... outer rod, 13 ... inner rod, 14 ... operating lever, 15 ... outer rotating shaft (rotating shaft of double shaft structure), 16
... Inner rotation shaft (rotation shaft of double shaft structure), 17,19 ... Inner arm, 30 ... Holder, 31 ... Insertion hole, D ... Hole diameter, H ...
Width, L ... axial length.

Claims (1)

[Scope of utility model registration request] 1. A transmission case is provided with a holder, which is fitted to an insertion hole provided in the case from the outside, and is rotatably supported by the holder and has an axial length longer than the width of the case. One of the rotating shafts of the double shaft structure is connected to the coaxial operation lever located outside the holder, and the other is connected to each inner arm fixed to the shaft end side in the case. A support structure for an operation lever, which is connected to a shift fork via a rod and has a diameter of the insertion hole into which the rotation shaft can be inserted obliquely from a case opening.