JP3065834B2 - Transmission operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed change operation device for a working machine such as a walk-behind cultivator, and more particularly, to switching between a speed change mechanism for traveling an airframe and a working device, for example, each of forward rotation, reverse rotation, and neutral state. The present invention relates to a shift operation device for a working machine including a variable transmission mechanism for a working device and a plurality of shift operation shafts for shifting.

[0002]

2. Description of the Related Art Conventionally, in the above-described speed change operation device,
For example, as shown in Japanese Patent Application Laid-Open No. 4-103438, a shift lever of a transmission mechanism for a vehicle traveling and a transmission lever of a transmission mechanism for a working device are separately provided, and the transmission mechanism for a vehicle traveling is operated to a reverse position. Now, a check mechanism that checks the work equipment shift lever so that it is not operated to the drive position,
There was a structure interposed between the operation levers.

[0003]

However, in the above-mentioned conventional structure, it is necessary to switch the traveling shift operation of the machine body and the shift operation of the working device by using different levers, respectively. However, a dedicated check mechanism for preventing the working device from being driven in the predetermined running state of the machine body is required, and there is a problem that the structure of the operation system is complicated, and there is room for improvement. In particular, as the number of forward traveling stages increases, the structure is further complicated. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to a first feature of the present invention, a plurality of shift operation shafts are linked to each other.
Slide the operating member for traveling and the operating member for work.
Arranged freely and in a superimposed state, each of these operating members is provided with an engaging portion for a shift operation lever, and furthermore, the sliding direction of each of the operating members is changed by the shift direction.
And sets the shift in the same direction as the direction of the shift operation shaft,
The shift operation shaft for shifting, the operation member for traveling, and the operation
The linkage with the operating members of the shift shift operation shaft and each operating member
In that it is performed by direct engagement with

A characteristic feature of the invention according to claim 2 is that, in the invention according to claim 1, the sliding direction of the operation member is set to a direction crossing the speed change operation lever.

A feature of the invention according to claim 3 is that, in the invention according to claim 1 or 2, the engagement portion of the operation member is an insertion hole through which the speed change operation lever is inserted.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the engaging portion of the operating member allows the transmission operation lever to freely swing. The point is that a flexible portion is provided.

[0008] wherein the configuration of the invention according to claim 5, claim
The invention according to any one of 1 to 4 , wherein the operation member is formed of a plate.

[0009]

According to the first aspect of the present invention, by operating one shift operation lever in accordance with a predetermined operation pattern, the operation member linked to the shift operation shaft corresponding to each operation position is selected. The shift operation lever is engaged with the shift operation lever, and each shift operation shaft is set to a predetermined shift state, and one shift operation shaft is set .
Just by operating the operating lever, the traveling position of the traveling operating member
With the operation maintained, move the operation member for operation to the drive position.
Operational member for traveling can be operated by being configured to be retractable
Gear shift operation and the gear shift operation state
A series of operations of gear shifting operation of the working device is operated while maintaining
This is possible only with the lever. In addition, the shift operation shaft for shifting
By directly interlocking and linking the operation member, the gearshift operation lever
When the operating member engaged with the key is slid,
Gear shift axis of shifting the slide operation force directly received by
Will be .

According to the second aspect of the present invention, the operating member to be engaged is selected, for example, by swinging the shift operation lever in the vertical direction, and the shift operation lever is swingably operated in the left and right direction, so that the selector Slide the combined operation member sideways,
A shift operation shaft linked to the operation member can be operated for shifting.

According to the third aspect of the present invention, the shift operation lever is inserted into the insertion holes (engagement portions) of the various patterns formed in the plurality of operation members, so that the engagement link between each operation member and the shift operation lever is established. The structure can be configured. In addition, the operating member in which the engaging portion is formed by the insertion hole has the strength as compared with the case where the engaging portion is formed by the notched concave portion or the projection because the entire periphery of the engaging portion is connected by the member. It is high and provides sufficient strength even with thin members.

According to the configuration of the fourth aspect, by forming the accommodating portion in the engagement portion, a state where the predetermined operation member is not engaged and operated even when the shift operation lever is operated can be exhibited.

According to the fifth aspect of the present invention , by arranging thin operating members in parallel in the plate surface direction, the operating member group can be compactly arranged. Further, a thin operating member can be easily manufactured by punching or the like.

[0014]

According to the first aspect of the present invention, it is possible to operate a plurality of shift operation shafts such as an airframe traveling speed change mechanism and a working device speed change mechanism in an appropriate state with a single operation lever. It is possible to provide a simple structure capable of surely setting an appropriate shift state without troublesome operations such as operating a plurality of levers.
The linkage structure with the shaft can be simplified, and the number of parts can be reduced.
This is effective for cost reduction.

According to the second aspect of the present invention, the selection and engagement of a plurality of operating members can be easily realized by the cross operation of the speed change operation lever, and the above-mentioned effect of the first aspect of the invention is promoted. I do.

According to the third aspect of the present invention, an engagement structure having excellent strength can be easily formed by merely inserting the speed change operation lever into the insertion hole of the operation member, and excellent durability can be obtained. It becomes something.

According to the fourth aspect of the present invention, by forming an appropriate accommodating portion in the engaging portion of each operating member, a plurality of shift shafts can be shifted in various forms, thereby simplifying a complicated shift. And the effect of the invention of claim 1, 2, or 3 can be remarkably exhibited.

[0018] According to the invention according to claim 5, it is possible to reduce the size of the speed change operation structure, easy can be manufactured at low cost, which is advantageous in practical use.

[0019]

Embodiments will be described below with reference to the drawings. FIG.
As shown in FIG. 1, a pair of left and right traveling wheels 2 is supported at the lower end of a transmission case 1 integrally formed with a rotary case, and is connected to a front portion of the transmission case 1.
And a rotary tilling device 5 [an example of a ground working device] is connected to a rear end of the transmission case 1 and a steering handle 6 is extended from a rear upper position of the transmission case 1 to a rear upper direction. Thus, a walking type cultivator as an example of a walking type working machine is configured.

The power of the engine 4 is input to the transmission case 1 via a belt transmission mechanism 7 which also serves as a belt tension type main clutch, and travel wheels 2 are transmitted via a traveling transmission mechanism 8 provided in the transmission case 1. To drive the aircraft,
A transmission system is configured so that power is supplied to the rotary tillage device 5 via the internal working device transmission mechanism 9. The machine body transmission mechanism 8 is configured to be operable to switch between three forward stages, one reverse stage, and a neutral state, and the working device transmission mechanism 9 is configured to be operable to switch between a forward / reverse rotation state and a neutral position. It is.

Next, the shift operation structure will be described. FIG.
As shown in FIG. 2, first and second shift rods 10 and 11 (an example of a shift operation shaft) for shifting operation of the traveling transmission mechanism 8 and a third shift rod 12 for shifting in the working device transmission mechanism 9 are provided. Example of Shift Operation Shaft] Each of the shift rods 10 and
The gears 11 and 12 are configured to be switched by one shift operation lever 13. That is, the first shift rod 10
Is shiftable to a forward first speed position F1, a neutral position N, and a reverse position R of the traveling transmission mechanism 8, and the second shift rod 11 is moved forward to a second forward speed position F2, a neutral position N, and a forward third position. Each of the speed positions F3 is configured to be able to switch the shift. Further, the third shift rod 12 is configured to be capable of switching the shift to a forward rotation drive position S, a neutral position N, and a reverse rotation drive position G, respectively.

The speed change operation lever 13 is disposed on the upper front side of the transmission case 1 with respect to the support shaft 14 with respect to the horizontal axis X.
A boss 15 rotatably fitted around the boss 15 is rotatably supported around an axis Y orthogonal to the axis X, and is swingably supported up, down, left, and right.
An operation guide plate 16 (an example of a fixing portion) having a U-shape in a plan view, which is connected and fixed to an upper portion of the device, is inserted so as to be operably extended rearward and outward. A decorative cover 17 made of a synthetic resin is mounted above the operation guide plate 16. As shown in FIGS. 3 and 4, the decorative cover 17 is configured such that a vertical plate locking portion 18 formed at the front end is hooked and locked to a front-view portal-type support stay 19 fixed to the operation guide plate 16. ,
The rear side is connected to the operation guide plate 16 by bolts and fixedly attached, thereby simplifying the assembly man-hour.
The operation guide plate 16 has an outer wire receiving member 2 for an operation wire 20 of a belt tension type main clutch.
1 is fixedly mounted, and a mounting boss 23 of a belt cover 22 that covers the belt transmission mechanism 7 is mounted and fixed.

FIG. 5 shows the operation guide plate 16.
As shown in FIG. 5, the operation path L1 for switching to the first forward speed position F1 or the reverse position R for the traveling transmission mechanism 8 and the operation path L2 for switching to the second forward speed position F2 or the third forward speed position F3 are neutralized. An operation along the path switching path L3 from the state where the operating lever 13 is in the forward first speed position F1 and a direction intersecting with the operation path from the state where the operation lever 13 is in the forward first speed position F1. , An operation path L4 for switching the working device transmission mechanism 9 between the neutral position N and the forward / reverse rotation positions S and G while maintaining the forward first speed state is formed.
In addition, by operating the operation lever 13 from the state of being in the second forward speed position F2 along the path switching direction and operating in a direction crossing the path switching direction, the operating device transmission mechanism 9 is moved to the neutral position N while maintaining the second forward speed state. An operation path L5 for performing a switching operation at each of the forward rotation position S and the normal rotation position S is formed. The operation guide section A is constituted by the respective paths. The speed change operation of the traveling speed change mechanism 8 with one operating lever 13, the forward / reverse drive switching operation of the rotary tilling device 5 in the state of the first forward speed state, and the state of the second forward speed state. A linking mechanism K for linking with the working device transmission mechanism 9 is interposed so that each of the switching operations of the rotary tilling device 5 to only the forward rotation drive can be performed.

More specifically, three plate-like shift operation members 24, 25, 26 linked to the shift rods 10, 11, 12 are provided on the inner side of the operation guide plate 16, respectively. It is slidably supported only in the direction, and is arranged so that the operation lever 13 is inserted through insertion holes 27, 28, 29 formed in the shift operation members 24, 25, 26. Each of the insertion holes 27, 28, 29 is shown in FIG.
As shown in (a), (b) and (c), the operation lever 13
And a flexible portion U that allows free operation of the operating lever 13 at other operating positions so that only the shift rods corresponding to the operating positions are shifted in the lateral direction. When the operation member 26 corresponding to the third shift rod 12 is operated, the first and second shift rods 10 and 11 are not operated so that the link mechanism K is operated.
Is configured.

In this manner, the drive of the rotary tilling apparatus 5 in the third forward speed state and the reverse state is prevented from being switched by the guide hole 16a of the operation guide plate 16, and the rotary tilling apparatus in the first forward speed state. 5 can be driven, and in the second forward speed state, only the forward rotation of the rotary tilling device 5 can be driven, and the work can be performed in a desired work form in a safe and highly efficient manner depending on field conditions. Becomes

[Other Embodiments] The number of the shift rods and the operation members is not limited to three , but may be four or more .

[0027] In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is an overall side view of a walking tiller.

FIG. 2 is a plan view of a speed change operation mechanism.

FIG. 3 is a side view of the speed change operation mechanism.

FIG. 4 is a front view of a speed change operation mechanism.

FIG. 5 is a diagram showing a relationship between a lever operation path and an operation member.

[Explanation of symbols]

 10, 11, 12 shift operation shaft 13 speed change operation lever 16 fixed portion 24, 25, 26 operation member 27, 28, 29 engagement portion A operation guide T engagement portion U flexible portion

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60K 20/00-20/08 F16H 59/00-59/12 F16H 63/00-63/38

Claims (5)

(57) [Claims] A plurality of shift operation shafts (10),
(11), a traveling operation unit associated with each of (12)
Materials (24) and (25) and operation members (26) for work
Are arranged side by side in a freely slidable and superimposed state,
Each of these operating members (24), (25), (26) has an engaging portion (27),
(28), (29) and each of the engaging portions (2
7) The patterns (28) and (29) are made different from each other, and by operating one shift operation lever (13),
The traveling positions of the traveling operation members (24) and (25)
Drive the operation member (26) for the work while maintaining it
Position so that it can be moved forward and backward, and further, each of the operating members
The sliding direction of (24), (25) and (26) is
Shift direction of shift operation axes (10), (11), (12)
And the shift operation shaft for shifting
(10), (11), (12) and the operating member for traveling (2
4), (25) and linkage with operation member (26) for work
To the shift operation shafts (10), (11), (12)
Direct engagement with each operating member (24), (25), (26)
A shift operation device that is designed to be operated in some cases . 2. The operating members (24), (25), (2)
The speed change operation device according to claim 1, wherein the sliding direction of (6) is set in a direction intersecting with the speed change operation lever (13). 3. The operating members (24), (25), (2)
3. The speed change operation device according to claim 1, wherein the engagement portions (27), (28), (29) of (6) are holes through which the speed change operation lever (13) is inserted. 4. The operation member (24), (25), (2)
6) The engagement portion (27), (28), (29) of (6) is provided with a flexible portion (U) that allows free swing of the speed change operation lever (13). The speed change operating device according to claim 1. Wherein said operating member (24), (25), (2
The speed change operating device according to any one of claims 1 to 4 , wherein ( 6) is formed of a plate-like body.