JPH0614115Y2 - Operation structure for traveling of work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a case where forward power is transmitted to a traveling device such that a speed change can be performed by a traveling transmission device, and backward power is changed by the traveling transmission device. The present invention relates to a traveling operation structure for a work vehicle provided with a forward / rearward travel switching device in a state in which it is transmitted to the traveling device uncontrollably.

[Conventional technology]

The work vehicle is designed to be safe so that the forward speed cannot be changed but the reverse speed cannot be changed.

In this type of work vehicle, conventionally, for example, the actual development Sho 61-135726
By configuring the check mechanism as shown in Japanese Patent Laid-Open Publication No. 2004-242242, safety was ensured so as to prevent accidental backward movement of the fuselage.

That is, a stopper that prevents the switching clutch member of the forward / reverse switching device from entering the reverse side and operating is attached to the mission case so as to swing and change between the working posture and the releasing posture, and the ball-type operation for the stopper is performed. The member is attached to the shifter support shaft mounting part of the mission case so that it can be retracted and retracted, and when the traveling transmission is in the transmission state, the operating member is pushed out by the large diameter part of the shifter support shaft and the stopper is pushed to the release position. When the vehicle is operated and the transmission is in the neutral state, the small diameter part of the shifter support shaft allows the operating member to retract, and the spring that biases the stopper to the working position pushes the operating member to urge it. The operation member is retracted due to the presence of the spring, and the stopper is configured to be in the working posture due to the spring.

In other words, there is a general concept that when the traveling transmission is in the neutral state, transmission to the traveling device is disabled and the aircraft does not travel.Therefore, while the traveling transmission is in the neutral state, the forward / reverse switching device is moved backward. If it is possible to switch to the state, the forward / reverse switching device may be operated to the reverse state while the traveling transmission is set to the neutral state at the time of inspecting the machine, which may unintentionally move the machine. Therefore,
Even if the forward / reverse switching device is operated to switch to the reverse drive state while the traveling transmission is in the neutral state, the forward / reverse drive device is not actually switched.

[Problems to be solved by the device]

Heretofore, the structure for restraint has been complicated, making assembly difficult and economically disadvantageous.

An object of the present invention is to modify the above safety measures so that the structure can be easily obtained.

[Means for Solving the Problems]

A feature of the present invention is that the first interlocking member for interlocking the traveling transmission and the artificial transmission is swingably attached to the work vehicle described above, and the forward-reverse switching device and the artificial forward-reverse switching device are connected to each other. A second interlocking member for interlocking is attached so as to be swingable around an axis parallel to the swing axis of the first interlocking member, and is brought into contact with a stopper portion (36) of the first interlocking member to contact the stopper. The second interlocking member is provided with a restraint portion that makes it impossible to switch the forward / reverse shift device to the reverse state, and the stopper portion is brought into contact with the restraint portion only in the neutral state of the traveling transmission. Is formed. The action and effect are as follows.

[Action]

Even if an attempt is made to switch the forward-reverse traveling switching device to the reverse traveling state while the traveling transmission is in the neutral position, the check portion comes into contact with the stopper portion and the second interlocking member does not swing, and the forward-reverse traveling switching device switches. I don't know.

[Effect of device]

The check structure has a stopper portion on the first interlocking member and a second interlocking member.
By simply providing each interlocking member with a restraint part, the structure can be easily obtained, and as described above, a work vehicle excellent in safety can be easily assembled and inexpensively obtained.

〔Example〕

As shown in FIG. 4, one running wheel (1), engine
(E) and the steering wheel (2), etc. on the front of the self-propelled aircraft,
A walk-type binder is provided by providing a working unit (3) that causes the planting culms to be cut along with the traveling of the aircraft and is also mowed, binding the cut culms by a set amount and discharging them to one lateral side of the aircraft. is there.

As shown in Fig. 2, the rotational power of the engine output shaft (4) is introduced into the mission case (6) via the input shaft (5),
The transmission for the turning power of (5) via the main clutch (7)
In addition to transmitting to the (M), the rotational power of the output shaft (8) of this traveling mission (M) is transmitted to the rocking wheel transmission case (9) via the transmission chain (10) inside the axle (11). It is configured to be transmitted to. Forward / reverse switching device (1) for traveling mission (M)
2) and traveling speed change device (13) are provided, and in order to configure the forward / reverse switching device (12), the output shaft (14) of the main clutch (7) is switched to the rotating shaft (15) that is geared. Clutch member (16)
To rotate together for spline engagement, and
When the clutch member (16) is mounted so as to slide, and the clutch member (16) is engaged with the transmission gear member (17) rotatably mounted on the rotating shaft (15) so as to rotate integrally with the gear clutch (17), The forward state is established so that the rotational force of the shaft (15) is transmitted to the output shaft (8) through the traveling transmission (13), the transmission gears (18), (21) and the transmission shaft (19), and the clutch member (16) is the rotation axis
When engaging the transmission gear (20), which is attached to (15) so that it can rotate relative to it, so that the transmission gear (20) rotates integrally,
The reverse drive state is set so that the rotational force of (15) is transmitted to the output shaft (8) via the transmission gears (20), (21) and the transmission shaft (19). In the traveling transmission (13), the shift gear member (23) is attached to the transmission shaft (22) so as to rotate integrally with the spline engagement and slide, and the shift gear member (23 The first gear part (23a) or the second gear part (23b) or the third gear part (23c) of 23) is a predetermined gear part (17a) or (17b) or (17c) of the gear member (17).
1st speed or 2nd speed or 3rd
I try to be fast.

In other words, the engine output is transmitted to the axle (11) via the main clutch (7), the forward / reverse switching device (12) and the traveling transmission (13) to drive the traveling wheel (1) in the forward and backward drive and the shift drive. You can do it. Then, the forward power is transmitted to the output shaft (8) through the traveling transmission (13), so that the traveling wheels can be shifted by the traveling transmission (13).
The reverse transmission power is transmitted to the output shaft (8) by bypassing the speed change gear member (17) of the travel transmission (13) and transmitted to the travel transmission (13). The gears are transmitted to the traveling wheels (1) in a state in which the gear shifting is impossible, and the gears can be shifted in three steps when the traveling wheels (1) are driven forward, but cannot be shifted when the vehicles are driven backward.

Then, as shown in FIG. 3, a fork type shifter (24) for sliding operation of the shift gear member (23) is configured to be slidably operated via a swing arm (25) and is a rotary shaft type transmission. The transmission case is a lever-type artificial transmission (27) that is interlocked with a first interlocking member (26) made of a bent round bar on the operation part (13a).
It is pivotally attached to the lateral side of (6) and the transmission (27) is attached to the pivot axis.
By swinging around (P ₁ ) in the machine longitudinal direction,
The (13a) is configured to rotate, and the traveling transmission (13) is switched by a manual swinging operation of the transmission (27). That is, the first interlocking member (26) is the operation unit.
The transmission (27) is attached to the end of (13a) protruding outside the transmission case so as to be integrally rotatable.
When the transmission (27) is rocked, the first interlocking member (26) penetrates through the free end side of 6) and is pressed by the transmission (27).
Swings around the axis (P ₂ ) of the operating part (13a), and the operating part (13a)
Rotates. Then, as shown in FIG. 1, when the transmission (27) is operated to the first operation position (I), the operation portion (13a) is brought to the first speed exposed position, and the transmission (27) is moved to the second operation position. When it is operated to (II), the operation part (13a) is set to the second speed developing position, and when the transmission (27) is operated to the third operation position (III), the operation part (13a) is set to the third speed developing position. It will be. Then, when the transmission (27) is operated to the fourth operation position (N) between the first operation position (I) and the second operation position (II), the operation portion (13a) becomes the neutral exposed position. . As shown in FIG. 2, the detent ball (28) attached to the shifter (24) is selectively engaged with a plurality of annular grooves (29a) ... (29b) formed on the shifter support shaft (29). The shift gear member (23) is held in the occlusal position or the non-occlusal position, but the shift gear member (23) is in the non-occlusal position between the second speed occlusal position and the third speed occlusal position. When the detent ball (28) is
Positioning the transmission (27) between the second operating position (II) and the third operating position (III) by constructing the shift gear member (23) so as not to hold the position thereof in contact with 9c). Therefore, it is impossible to set the traveling transmission (13) to the neutral state.

As shown in FIG. 3, attach the clutch member (16) to the swinging fork (30).
Artificial forward / reverse switching device (33) in which a second interlocking member (31) and an operation cable (32) are interlocked with a rotary shaft type forward / reverse switching device operation unit (12a) configured to be operated via Is attached to the steering handle (2) so that it can be operated with the fingers of the hand that holds it, and the operating section (12a) is configured to rotate when the forward / reverse switching tool (33) swings up and down. , Forward / reverse switching device by manipulating the forward / backward switching tool (33) manually
The switching operation of (12) is performed. That is, the second interlocking member (31) is integrally rotatably attached to the end portion of the operation portion (12a) protruding outside the mission case, and by swinging the forward / reverse switching member (33), The second interlocking member (31) is parallel to the shaft core (P ₂ ) due to the artificial operation force or the biasing force of the forward biasing spring (34) acting on the clutch member (16). When the second interlocking member (31) moves to the first swinging position (F) as shown in FIG. 1 by swinging around the shaft center (P ₃ ), the operating portion (12a) moves to the forward moving-out position. , Second
When the interlocking member (31) is in the second swinging position (R), the operating portion (12b) is in the reverse moving-out position.

In other words, the forward / backward switching device (12) is switched by the artificial vertical swinging operation of the forward / backward switching tool (33) to switch the aircraft forward / backward, and the manual forward / backward swinging operation of the transmission (27) is used for traveling. By changing the operation of the transmission (13), the forward movement of the machine body is performed.

As shown in FIG. 1, the operation part (1) is attached to the first interlocking member (26).
A stopper portion (36) is provided by additionally attaching a stopper forming link (35) through 3a), and a rod restraining portion (37) is provided at the free end portion of the second interlocking member (31). For safety, the forward-reverse traveling switching device (12) cannot be switched to the reverse traveling state while the traveling transmission (13) is kept in the neutral state.

That is, one end of the restraining part (37) is pivotally supported by the second interlocking member (31) through the connecting pin (38) and the other end of the restraining part (37) is held by the holder (3).
A stopper forming link (3
By being attached to 5), it is configured to move with respect to the stopper portion (36) as the first interlocking member (26) swings. Then, as shown by the solid line in FIG. 1, the transmission (27)
Stopper part (36) only when is in the 4th operating position (N)
Is formed so as to face the free end of the restraining part (37), so that when the traveling transmission (13) is in the neutral state,
Even if an operation for switching the forward / reverse traveling switching device (12) to the reverse traveling state is performed, the restraining portion (37) contacts the stopper portion (36) and the second operating position (second) of the second interlocking member (31) ( R) to prevent the forward / reverse switching device (12) from switching to the reverse drive state, and when the traveling transmission (13) is in the transmission state, the check part (37) causes the stopper (37) to stop. Allowing the swing of the second interlocking member (31) to the second operation position (R) without contacting the portion (36) enables the forward / reverse switching device (12) to switch to the reverse state. To do.

[Another embodiment]

FIG. 5 shows another embodiment of the restraint mechanism, in which the restraint section (37) is shown in the second position.
It is provided in a state of being fixed to the interlocking member (31). Then, the restraint part (37) and the stopper part (36) are set to the first position as shown in FIG.
From the interlocking member (26) or the second interlocking member (31) to its swing axis
By protruding in the direction along (P ₂ ) or (P ₃ ),
When the transmission (27) is in the fourth operation position (N), the stopper (3
6) acts on the restraint section (37), and the stopper section (36) moves around the restraint section (37) during a gear shift operation to operate the operation section (13a).
It is configured to allow the rotation of the.

Besides the binder, the present invention can be applied to various work vehicles such as rice transplanters and cultivators. The present invention can also be applied to a crawler type traveling person, and the wheel (1) is referred to as a traveling device (1).

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the operating structure for traveling of a work vehicle according to the present invention. Fig. 1 is a plan view of a check mechanism, Fig. 2 is a developed sectional view of a traveling mission, and Fig. 3 is a shifter mounting portion. Sectional drawing, FIG. 4 is a side view of the whole walking type binder, FIG. 5 is a plan view of another checking mechanism, and FIG. 6 is a sectional view taken along line VI-VI of FIG. (1) …… Traveling device, (12) …… Forward / reverse switching device, (13)…
… Transmission gearbox, (26) …… first interlocking member, (27) …… artificial transmission, (31) …… second interlocking member, (33) …… artificial forward / reverse switching device, (36)… … Stopper part, (37) …… Checking part, (P
₂ ), (P ₃ ) ... Shaft core.

Claims (1)

[Scope of utility model registration request] 1. The forward drive power is transmitted to the traveling device (1) so that the traveling transmission (13) can shift the speed, and the backward traveling power cannot be changed by the traveling transmission (13). A traveling operating structure for a work vehicle provided with a forward-reverse switching device (12) in a state of being transmitted to a traveling device (1), wherein the traveling transmission (13) and an artificial transmission (27) are interlocked. First interlocking member for
A second interlocking member for attaching the (26) swingably and interlocking the forward / reverse switching device (12) and the artificial forward / reverse switching device (33).
(31) is swingably mounted around an axis (P ₃ ) parallel to the swing axis (P ₂ ) of the first interlocking member (26), and the first interlocking member (26)
The forward / reverse switching device (1
2) The second interlocking member (31) is provided with a restraint portion (37) that makes it impossible to switch to the reverse drive state, and the restraint portion (37) is provided only in the neutral state of the traveling transmission (13). ) Is abutting with the stopper portion (36), the operating structure for traveling of the working vehicle.