JP2003054283A - Transmission operation device of work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability. SOLUTION: In this transmission operation device of the work vehicle provided with a plurality of forward positions L and H, a transmission neutral position N and a reverse position R as operation positions of a shift lever 33, both the forward positions L and H are arranged in the state of parallel connection on one side of points located with the transmission neutral position N between them, while only the reverse position R is arranged on the other side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear shift operating device for a work vehicle such as a tractor having a plurality of forward drive positions, a gear shift neutral position and a reverse drive position as operating positions of a gear shift lever.

[0002]

2. Description of the Related Art A conventional speed change device for a work vehicle of this type,
For example, in a shift operating device having two low speed forward movement positions L and high speed forward movement positions H as the forward movement positions, FIG.
As shown in (b), the low speed forward drive position L is arranged on one side, for example, the front side of the positions located across the shift neutral position N, and the high speed forward drive position H and the reverse drive are provided on the other side, for example, the rear side. The position R and the position R were connected in parallel.

[0003]

According to the above-mentioned prior art, a main gearshift operation path such as a front-rear posture having a gearshift neutral position N in the middle is provided as a gearshift operation path for moving the gearshift lever between respective operation positions. One portion of the main gearshift operation path portion A is provided with a portion A and an auxiliary gearshift operation path portion B that is branched from the gear shift neutral position N of the main gearshift operation path portion A toward the other side. By adopting means for arranging the low speed forward drive position L at the end and the reverse drive position R at the other side end, and arranging the high speed forward drive position H at the other side end of the auxiliary gear shift operation path portion B, Switching between low speed forward movement and reverse movement, which is frequently required at the time of work, can be performed simply by operating the shift lever in a straight line along the main shift operation path portion, resulting in good operability.

However, according to the above-mentioned conventional technique, the high speed forward drive position H is located on the other side of the gear shift neutral position N, that is, on the side opposite to the low speed forward drive position L, regardless of the forward drive position. When moving forward, the shift lever has to be operated backward, which is the opposite of the case where the vehicle is moving forward at a low speed, and there is a problem in terms of operation such that the driver is confused.

An object of the present invention is to improve operability.

[0006]

The features, functions, and effects of the shift operating device for a working vehicle according to the present invention according to claim 1 are as follows.

[Characteristics] A gear shift operation device for a work vehicle, comprising a plurality of forward movement positions, a gear shift neutral position, and a reverse gear position as operation positions of a gear shift lever, among the positions located across the gear shift neutral position. All of the forward drive positions are arranged in parallel on one side, and only the reverse drive position is disposed on the other side.

[Operation] Since all of the forward drive positions are arranged on one side of the gear shift neutral position, for example, on the front side, and the reverse drive position is arranged on the other side of the gear shift neutral position, for example, on the rear side, the shift lever for each forward gear shift The operating direction of the shift lever can be set to be the same as that of the forward shift when the reverse shift is performed.

[Effect] Therefore, the gear shifting operation can be performed without confusion and the usability can be improved.

The features, functions, and effects of the shift operating device for a work vehicle according to the second aspect of the present invention are as follows.

[Characteristics] In the gear shift operating device for a work vehicle according to the present invention according to claim 1, the gear shift operation path for moving the operation lever between the respective operation positions has a main gear shift neutral position in the middle. It is formed of a gear shift operation path portion and an auxiliary gear shift operation path portion branched from the gear shift neutral position of the main gear shift operation path portion toward one side.

[Operation] Since the gear shift operation path is provided with a main gear shift operation path portion such as a front-rear posture in which a gear shift neutral position is formed in the middle, the gear shift lever is linearly moved along the main gear shift operation path portion. It is possible to switch between forward and backward movement by moving it manually.

[Effect] Therefore, it is possible to switch between forward and backward movement with good operability.

The features, functions, and effects of the shift operating device for a work vehicle according to the third aspect of the present invention are as follows.

[Characteristics] In the gear shift operation device for a work vehicle according to the present invention as set forth in claim 2, a low speed forward drive position of the forward drive positions is arranged at one end of the main shift operation path portion, and the other side end thereof is arranged. The point is that the reverse position is arranged.

[Operation] Since the low speed forward drive position of the forward drive positions is arranged at one end of the main gear shift operation path portion and the reverse drive position is arranged at the other end of the main gear shift operation path portion, the shift lever is connected to the main gear shift operation path. By linearly moving along the portion, it is possible to switch between low speed forward movement and reverse movement that are frequently required during work.

[Effect] Therefore, it has become possible to switch between low speed forward movement and reverse movement with good operability.

The features, functions, and effects of the gear shift operating device for a work vehicle according to the fourth aspect of the present invention are as follows.

[Characteristics] In the gear shift operating device for a work vehicle according to the present invention as defined in claims 2 and 3, the main gear shift operating path portion forms a crank portion at a gear shift neutral position.

[Operation] By forming the crank portion at the gear shift neutral position of the main gear shift operation path portion, when the gear shift lever is operated between the forward position and the reverse position along the main gear shift operation path portion, the gear shift lever is operated. Since it is possible to intuitively know that the gear shift lever has been operated to the gear shift neutral position by a slight catch on the crank part of the above, it is possible to easily grasp that the gear shift lever has been operated to the gear shift neutral position. be able to.

[Effects] Therefore, it is possible to surely and easily perform the operation to the shift-neutral state while the forward operation and the reverse operation can be switched with the operability by the linear operation of the speed change lever in the main speed change operation path portion. Became.

The features, functions, and effects of the shift operating device for a work vehicle according to the fifth aspect of the present invention are as follows.

[Characteristics] In the gear shift operating device for a work vehicle according to the present invention as defined in claims 1, 2, 3 and 4, the gear shift lever is disposed on one side of the driver's seat.

[Operation] In the work vehicle, there are cases where it is desired to dispose the speed change lever on the left and right sides of the driver's seat. In such a case, even if the gearshift levers are placed on the left and right sides of the driver's seat by matching the operating direction of the gearshift levers with the direction of travel of the vehicle body to improve usability, the desired gearshift can be performed. Focusing on the point that it can be operated with good operability, a gear shift lever is placed on the left and right sides of the driver's seat.

[Effect] Therefore, it is possible to satisfy the above-mentioned demands while maintaining the desired gear shifting operability.

The features, functions, and effects of the shift operating device for a work vehicle according to the sixth aspect of the present invention are as follows.

[Characteristics] In the gear shift operating device for a work vehicle according to the present invention according to claim 1, 2, 3, 4, or 5, the high speed forward drive position of the forward drive positions is arranged closer to the center of the machine than the low speed forward drive position. There is a point.

[Operation] In the work vehicle, the low speed forward drive is used more frequently than the high speed forward drive. Focusing on the above point, the high-speed forward position, which is less frequently used, is located on the center side of the aircraft, which is easy to be restricted by the operation, and the low-speed forward position is located on the outside of the aircraft, which is easy to operate, from the body of frequent use. It has become possible to switch to the low speed forward, which is frequently used, with good operability.

[Effect] Therefore, the operability can be further improved.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION A tractor, which is an example of a work vehicle,
As shown in FIG. 1, an engine 3 is provided at a front portion of a vehicle body including a pair of left and right driving front wheels 1 for steering and a pair of left and right driving rear wheels 2.
Is mounted, the driver's seat 4 is mounted on the rear part of the vehicle body, and the protective frame 5 is provided.

As shown in FIG. 4, the rear wheel transmission system from the engine 3 to the rear wheel differential 6 with respect to the drive rear wheel 2 has a main clutch 7 for connecting and disconnecting the output of the engine 3, and an output of the main clutch 7. The main transmission 8 is a four-speed transmission that shifts the gears, and the auxiliary transmission 9 that shifts the output of the main transmission 8 and transmits the output to the rear wheel differential 6.

A power take-off shaft 11 is mounted on the rear portion of the rear wheel diff case 10 in which the rear wheel diff 6 is housed, and a take-out transmission system from the main clutch 7 to the power take-off shaft 11 includes: A power take-off clutch 12 is provided.

The auxiliary transmission 9 is the rear wheel differential case 1.
0 is the shift case.

As shown in detail in FIG. 5, the sub-transmission device 9 is capable of switching between four states of a low speed forward state, a high speed forward state, a reverse state and a shift neutral state.
Is arranged in the vicinity of the rear wheel diff 6, and the speed change mechanism M includes a low-speed forward transmission for low-speed forward transmission from the front-rear posture input shaft 14 to the rear-wheel diff 6 output shaft 18 in the front-rear posture. State and non-transmitted state, a constant mesh type first gear speed changer M1 that can be switched between a neutral state and a reverse-transmitted state, and a high-speed forward transmission state in which high-speed forward transmission is performed from the input shaft 14 to the output shaft 18 and is not transmitted. It is configured such that a gear meshing type second gear transmission portion M2 that can be switched to a neutral state is disposed close to each other in the axial direction.

The first gear transmission M1 has an input shaft 14
The low-speed forward transmission gear 15 and the reverse-transmission gear 16 are mounted in a freely rotatable state, and the low-speed forward passive gear portion 19 that is always meshed with and interlocks with the output shaft 18 and the power take-out. The reverse transmission gear 16 is provided via an idle gear 21 mounted on the shaft 11 so as to rotate only freely.
A passive gear body 23 having a reverse passive gear portion 22 that is always meshed with each other is mounted in a state of integrally rotating, and a low speed forward transmission gear 15 and a reverse transmission gear 16 of the input shaft 14 are mounted.
By mounting the distribution output gear 24 in a state of integrally rotating at a position between and, by shifting along the axial direction,
The low-speed forward transmission gear 15 has a low-speed forward position where the power of the distribution output gear 24 is transmitted to the low-speed forward transmission gear 15 in mesh with the input gear portion 25 and the distribution output gear 24, and a reverse transmission gear 16. Input gear section 26
And the reverse position where the power of the distribution output gear 24 is transmitted to the reverse transmission gear 16 in mesh with the distribution output gear 24, and the power of the distribution output gear 24 without meshing and interlocking with both the input gear parts 25 and 26. Is provided with a sleeve-shaped first shift member 27 that is freely changeable to a neutral position where it is not transmitted to the low speed forward transmission gear 15 and the reverse transmission gear 16.

The second gear speed change portion M2 is mounted on the input shaft 14 so as to integrally rotate the high speed forward transmission gear 17 at a position sandwiching the reverse transmission gear 16 with the low speed forward transmission gear 15 and the output shaft 18 In addition, by shifting along the axial direction, the high-speed forward drive gear that is changeable between a high-speed forward position that meshes with the high-speed forward transmission gear 17 and a neutral position that does not mesh, that is, the second shift member 2
8 is mounted so as to rotate integrally.

That is, by shifting both the first shift member 27 and the second shift member 28 to the neutral position,
By revealing a gear shift neutral state in which none of the low speed forward transmission, the high speed forward transmission, and the reverse transmission is performed, and shifting the first shift member 27 to the low speed forward position while the second shift member 28 is shifted to the neutral position. , A low speed forward state where the power of the input shaft 14 is transmitted to the output shaft 18 at a low speed is revealed, and the second shift member 28 is shifted to the high speed forward position while the first shift member 27 is shifted to the neutral position.
The high speed forward state in which the power of the input shaft 14 is transmitted to the output shaft 18 at a high speed is revealed, and the second shift member 27 is shifted to the reverse position while the second shift member 28 is shifted to the neutral position. It is configured to expose a reverse drive state in which the power of 14 is transmitted to the output shaft 18 in the reverse drive.

Reference numeral 13 in FIG. 4 is a clutch for transmitting the power taken out from the output shaft 18 via the gear train to the transmission shaft 20 to the drive front wheel 1.

As shown in FIGS. 6 to 8, the first shift operating shaft 3 for shifting the first shift member 27 through the first shifter 29 by swinging about the left-right axis.
0, and a second shift operation shaft 32 that shifts the second shift member 28 through a second shifter 31 by swinging about the left-right axis, and the auxiliary transmission device 9 for operating the auxiliary transmission device 9. The auxiliary shaft 34 of the auxiliary transmission lever 33 (see FIGS. 2 and 3) arranged on the left and right sides of the driver's seat 4 is arranged along the output shaft of the rear wheel differential 6 in the rear wheel differential case 10. Is attached to.

As shown in FIG. 9, the auxiliary transmission lever 33 is attached to a swing bracket 35 which is swingably supported by the pivot shaft 34 in such a manner that it can swing back and forth around the axis of the pivot shaft. It is configured so that it can be operated in a cross motion to the left and right.

Then, the gear shift operating device provided with the sub-transmission lever 33 operates so as to operate the sub-transmission device 9.
The auxiliary shift lever 33 is provided with a low speed forward drive position L, a high speed forward drive position H, a gear shift neutral position N, and a reverse drive position R, both of which are examples of forward drive positions.

As shown in FIG. 10, the low speed forward position L
And the high speed forward position H are arranged in front of the shift neutral position N (one side) in a state of being connected in parallel to the shift neutral position N,
The reverse position R is disposed on the rear side (the other side) of the gear shift neutral position N. That is, only the reverse position R is arranged behind the gear shift neutral position N.

More specifically, the speed change operation path for moving the auxiliary speed change lever 33 between the respective operation positions is the main speed change operation path portion A in the front-rear direction having the speed change neutral position N in the front-rear direction, and The main gearshift operation path portion A is formed on the driver seat 4 side, and is formed from an auxiliary gearshift operation path portion B which is branched forward from the gear shift neutral position N of the main gearshift operation path portion A. , The low speed forward position L is arranged at the front end (one side end) of the main shift operation path portion A, and the reverse position R is arranged at the rear end (other side end) of the main shift operation path portion A. The high speed advance position H is arranged at the front end (one side end) of the operation path portion B. That is, the high speed forward drive position H is located closer to the center of the machine than the low speed forward drive position L. The operation stroke SH from the gear shift neutral position N to the high speed forward drive position H is set larger than the operation stroke SL from the gear shift neutral position N to the low speed forward drive position L.

The shift guide plate 36 for guiding the auxiliary shift lever 33 to move along the shift operation path by being inserted into the groove is a base plate 37 made of an iron plate and a resin surface laminated on the upper surface thereof. The face plate 38 is configured so as to slide and guide the auxiliary transmission lever 33. Then, as shown in FIGS. 2 and 3, of the stay 40 supporting the rear wheel fender 39 for the drive rear wheel 2, a surface different from the mounting side surface a of the rear wheel fender 39, that is, the upper surface of the upper bending piece 40a. It is attached to b with a bolt and nut in a cantilever shape protruding toward the driver's seat 4 side. The auxiliary shift lever 33 is, as shown in FIG.
A swinging force is urged by a spring 41 toward the main shift operation path portion A side. Further, as shown in FIG. 10, at the gear shift neutral position N of the main gear shift operation path portion A, the auxiliary gear shift lever 33 is swung left and right to slightly enter the gear shift operation neutral position N of the main gear shift operation path portion A. A recess 42 that allows the driver to intuitively know N
Are formed.

The link mechanism for switching the auxiliary transmission device 9 in conjunction with the operation of the auxiliary transmission lever 33 is shown in FIGS.
As shown in (a) and (b) of FIG.
The rear wheel differential 6 is externally mounted along the output shaft. Specifically, the pivot shaft 34 is swung back and forth around the pivot shaft axis, whereby the first shift operation shaft 3 is moved.
A first lever 45 for swinging a first operating arm 43 mounted on the outer end of 0 in a state of swinging integrally with a first rod 44 whose length is adjustable, and a swing back and forth around a pivot axis. A second lever 48 for swinging a second operating arm 46 mounted on the outer end of the second shift operating shaft 32 so as to swing integrally with the second shift operating shaft 32 via a second rod 47 whose length is adjustable. When the first shift lever 33 is mounted and the first lever 45 is in the shift neutral position, the sub shift lever 33 is moved to the shift neutral position N of the main shift operation path portion A of the shift neutral position N of the shift operation path. When the second lever 48 is in the gear shift neutral posture, the first arm 45a that swings integrally with the first lever 45 by swinging is engaged with the first arm 45a so as to swing integrally with the first lever 45a. Sub-shift operation path portion of the shift neutral position N Auxiliary shift lever to shift the neutral position of the B 3
The gear shift selector 49 is engaged with the second arm 48a, which swings integrally with the second lever 48 when 3 is pivoted left and right, so as to integrally swing forward and backward, and a mutual restraint means is provided. Has been done.

The mutual restraint means changes the neutral position of the second operating arm 46 from the neutral position of the second operating arm 46 when the first operating arm 43 is in a position other than the neutral position of the gear shifting, that is, in the low-speed forward position and the reverse position. While the second operating arm 46 is kept in the gear shift neutral posture by preventing the swinging to the high-speed forward posture, the second operating arm 46 is in the swinging position in the high-speed forward posture, and when the second operating arm 46 is in the swinging position. It is possible to prevent swinging from the shift neutral position to the low speed forward position and the reverse position to
It is a means for maintaining the operation arm 43 in the gear shift neutral posture.

Specifically, an engagement pin 51 is provided in series with an operation arm 50 that swings integrally with the second operation arm 46,
The first shift operation shaft 30 is attached to the first operation arm 43.
The first elongated hole 52 having a posture along the circumference and the second elongated hole 53 having a posture along the second shift operation shaft 32 are formed to communicate with each other while the first operation arm 43 is in the gear shift neutral posture. Then, the engaging pin 51 moves along the first elongated hole 52 in a state of being engaged with the first elongated hole 52, whereby the second pin
While allowing the swing of the first operation arm 43 while the operation arm 46 is maintained in the gear shift neutral posture, the engagement pin 51 is engaged with the second elongated hole 53 along the second elongated hole 53. By moving, the second operation arm 46 is allowed to swing with the first operation arm 43 maintained in the gear shift neutral posture.

[Other Embodiments] In the above embodiment, the gear shift operation path includes the main gear shift operation path portion A and the sub gear shift operation path portion B located closer to the center of the machine body than the main gear shift operation path portion A. As for the gear shift operation path, (a) in FIG.
It may be as shown in (b), (c) and (d).
That is, in the gear shift operation path shown in (a), the main gear shift operation path portion A is arranged closer to the center of the machine than the sub gear shift operation path portion B is. The shift operation route shown in (b) is (a)
In FIG. 5, the front end of the main gear shift operation path portion A is set to the high speed forward position H, and the front end of the auxiliary gear shift operation path portion B is set to the low speed forward position L. In the gear shift operation path shown in (c), the crank portion 54 is formed at the gear shift neutral position N as the main gear shift operation path portion A in the above embodiment. In this case, the crank portion 54 is
Since the same function as that of No. 2 is exerted, the recess 42 is not formed. The gear shift operation path shown in (d) includes an operation path portion a1 from the gear shift neutral position N to the low speed forward drive position L, an operation route portion a2 from the gear shift neutral position N to the high speed forward drive position H, and a reverse drive from the gear shift neutral position N. The operation path portion a3 to the position R is arranged and formed by changing the position in the left-right direction.

In the above-described embodiment, the gear shift operating device having the low speed forward drive position L, the high speed forward drive position H, the reverse drive position R and the gear shift neutral position N is shown, but as shown in FIG. In addition, the present invention can be applied to a gear shift operation device having the middle speed forward drive position M.

In the above-described embodiment, the sub-transmission lever 33 is provided at one position on the left and right sides of the driver's seat 4, but the sub-transmission lever 3
A column shift type in which 3 is provided on the handle post may be adopted for implementation.

[Brief description of drawings]

1] Side view

FIG. 2 is a plan view of the main part

FIG. 3 is a cutaway rear view of a main part.

[Fig. 4] Transmission system diagram

FIG. 5 is a vertical sectional side view of the auxiliary transmission device.

FIG. 6 is a vertical cross-sectional side view of an auxiliary shift operation unit.

FIG. 7 is a vertical cross-sectional rear view of the auxiliary shift operation unit.

[Figure 8] Sub-shift operation system diagram

FIG. 9 is a vertical cross-sectional rear view and a cross-sectional plan view of the main part of the auxiliary gear shift operation unit.

FIG. 10 is a plan view of a shift guide plate.

FIG. 11 is a schematic view of each shift guide route showing another embodiment.

FIG. 12 is a schematic view of a shift guide route according to another embodiment.

FIG. 13 is a schematic view of each shift guide route showing a conventional technique.

[Explanation of symbols]

33 Gear lever H high speed forward position L Low speed forward position N gear shift neutral position R reverse position A Main gear shift operation path B Sub gear shift operation path part 54 Crank part 4 driver's seat

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Megumi Sawai             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Kenichi Sato             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Kiyoshi Hanamoto             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Yasunobu Yamaue             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory (72) Inventor Shinji Osawa             64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubo Co., Ltd.             Ta Sakai Factory F-term (reference) 3D040 AA03 AA10 AA23 AB04 AB08                       AC24 AC28 AC62 AC66 AF08

Claims (6)

[Claims] 1. A shift operation device for a work vehicle, comprising a plurality of forward positions, a shift neutral position, and a reverse position as an operating position of a shift lever, wherein one of positions located across the shift neutral position. A shift operating device for a working vehicle, wherein all forward positions are arranged in parallel on one side and only the reverse position is arranged on the other side. 2. A main gearshift operation path portion having the gearshift neutral position in the middle, and a gearshift operation path for moving the operating lever between the respective operation positions; The shift operation device for a work vehicle according to claim 1, wherein the shift operation device is formed of an auxiliary shift operation path portion branched toward the side. 3. A shift operation of a work vehicle according to claim 2, wherein a low speed forward drive position of the forward drive positions is arranged at one side end of the main gear shift operation path portion, and the reverse drive position is arranged at the other side end thereof. apparatus. 4. The shift operating device for a work vehicle according to claim 2, wherein the main shift operating path portion forms a crank portion at a shift neutral position. 5. The gear shift operation device for a work vehicle according to claim 1, wherein the gear shift lever is disposed on one side of the driver's seat on the left and right sides. 6. The high-speed forward position of the forward-moving positions is arranged closer to the center of the vehicle than the low-speed forward position.
5. The shift operating device for a work vehicle according to any one of 5 above.