JPH03135877A - Working car - Google Patents

Abstract

PURPOSE:To improve running workability by linking a pair of operational parts for sliding operation of a pair of side gears that transmit motion power to a pair of right and left running devices, with a braking operational part of a main brake through a release wire, so as to energize the pair of operational parts in a specified direction, through a spring. CONSTITUTION:A transmission such as a combine has a transmission side gear 19 that transmits motion power gear-changed by changing the engagement of multiple gear lines. Right and left side gears 21 (21L, 21R) are fitted outside to a supporting shaft 20 for the transmission side gear 19, so as to be freely slid from an engagement position with the transmission side gear 19, to an engagement position with a pair of braking side gears 26L, 26R. One end of an inner wire 45b of a release wire 45 is linked to one side of a pair of operational parts 46R, 46L that operate each side gear 21, while the other end thereof is linked to a braking operational part of a main brake (not depicted in the drawing). A spring 49 is provided for energization so as to draw both of the operational parts 46R, 46L, to an engagement side of the transmission side gear 19, with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a traveling transmission system in a working vehicle such as a combine harvester.

[Conventional technology]

Some combine harvesters, which are one type of work vehicle, are equipped with a pair of left and right crawler-type running devices, and are configured to apply braking to one of the running devices to make a pivot turn. The structure is as follows.

That is, as shown in FIG. 8, the left and right side gears (2LL) transmit power to the left and right traveling devices (not shown).

(21R) are both engaged with the transmission side gear (19), power is transmitted to both traveling devices from the input gear (23R), (23
The air flows in the normal direction through the axles (22R) and (22L), and the aircraft moves straight. Then, for example, slide the left side gear (2LL) to shift the left braking side gear (
26L) and engages and operates the handbrake (28) of this left braking side gear (26L), the left traveling device is braked and the aircraft turns to the left.

Also, the left side gear (21L) is connected to the transmission side gear (1
9) Since a spring (50) is provided that biases the occlusal side, when the sliding operation toward the left braking side gear (26L) is stopped, the left side gear (26L) is biased by the biasing force of the spring (50).
1L) separates from the left braking side gear (26L) and engages with the transmission side gear (19).

Furthermore, slide the left and right side gears (2LL) and (21R) to shift the left and right braking side gears (26L) and (26R).
), and then the main brake (42) applies braking to the left and right braking gears (26L) and (26R) to park the aircraft.

[Problem to be solved by the invention]

If the above-mentioned parking operation is performed immediately after completing a pivot turn by applying braking to one of the traveling devices in the above-mentioned work vehicle, the following problem may occur.

In other words, as shown in Fig. 8, for example, the left side gear (2
When performing a parking operation immediately after turning with the left braking side gear (26L) engaged with the left side gear (21L),
) remains engaged with the left braking gear (26L), and the right side gear (21R) is engaged with the right braking gear (26R) to engage and operate the main brake (42).

In this case, the right braking side gear (26R) is the gear (29),
It is connected to the left braking side gear (26L) via the transmission system of the transmission shaft (27) and gear (29), and this left braking side gear (26L) is also connected to the left side gear (21L), input gear (23L), and axle. Since it is connected to the ground via (22L) and the left traveling device, the right braking side gear (26R) is not in a state where it can freely rotate, but is in a state where it is fixed at a certain rotational phase. On the other hand, right side gear (21R)
Since it is also connected to the ground via the input gear (23R), the axle (22R), and the right traveling device, it is not in a state where it can rotate freely but is in a state where it is fixed at a certain rotational phase.

Therefore, when sliding the right side gear (21R) to engage the right braking gear (26R) in the above condition, the right side gear (21R) and the right braking gear (26R)
) do not match well, the right side gear (21R) will not mesh smoothly with the right braking gear (26R), and the right side gear (21R) will be forced into engagement. As a result, the left and right side gears (2
1L), (21R) and left and right braking side gears (26L)
, (26R) The surface pressure on the contact surface of the gear teeth becomes extremely high.

When the main brake (42) is engaged and operated again in the above-mentioned state and the main brake (42) is disengaged to restart the vehicle, the left and right side gears (21L) are shifted by the biasing force of the spring (50).
), Even if an attempt is made to return (21R) to the occlusal side of the transmission gear (19), the spring (50) overcomes the frictional force on the contact surface due to the high surface pressure on the contact surface of the gear teeth. Left and right side gear (21L), (2
1R) is the left and right braking side gear (26L).

(26R) becomes impossible to leave. Therefore, even if you try to move forward in this state, the transmission side gear (
19) will just spin idly and you will be unable to move forward.

Here, the present invention aims to prevent the situation where the vehicle cannot move forward when restarting, as described above.

[Means to solve the problem]

The feature of the present invention is that the above-mentioned work vehicle is configured as follows. That is, one end of the inner wire of the release wire is connected to one of a pair of operating parts that slide each of the side gears, and one end of the outer wire of the release wire is connected to the other of the operating parts, and , the other end of the inner wire is connected to a brake operation part of the main brake, and the inner wire is connected so that both operation parts are mutually operated until both side gears engage with both brake side gears when the main brake is applied. is configured to be pulled toward the braking operation section, and a spring that urges both operation sections to draw each other toward the transmission side gear engagement side is connected to the other side gear while one side gear is engaged with the braking side gear. The mechanism is constructed across both operation sections in such a way that a biasing force is exerted from the time when the gear begins to separate from the transmission side gear, and its functions and effects are as follows.

[For production]

As shown in Fig. 1, for example, the left side gear (21L) engages with the left braking side gear (26), and the right side gear (21R
) is engaged with the transmission gear (19), and when the main brake is operated toward the input side, the inner wire (45)
b) is pulled to the left in the paper, and the right side gear (21R) moves away from the transmission gear (19j) and toward the right braking gear (26R) via the right operation part (46R).

In this state, both operation parts (46R), (46L)
Flexibility of the spring (49) installed across (A1)
, (A2) (see Figure 4) has already disappeared, and the biasing force of the spring (49) is gradually strengthened. As a result, the left side gear (2LL) has a spring (50) (originally provided) that biases it toward the transmission side gear (19),
The biasing force of both springs (49) installed on both operating parts (46R) and (46R) will work, and as shown in Figure 2, the strong bias of both springs (49) and (50) will be applied. Depending on the force, the left side gear (21L) becomes the left braking side gear (26L)
move away from

After that, when the inner wire (45b) is pulled further, the right operation part (46R
) The right side gear (21R) is slid until it engages with the right braking side gear (26R), and by moving the outer wire (45a) to the right in the drawing, the right side gear (21R) is operated via the left operation part (46L). left side gear (2
1L) is again engaged with the left braking side gear (26L). Then, in the state shown in FIG. 3, the main brake is applied.

In this way, once the side gear that was engaged with the braking side gear is removed from the braking side gear after the aircraft has stopped (the state shown in Figure 2), the transmission shaft (27>) and the left and right gears ( 29>, (29> and left and right braking side gears (26L
), (26R) are in a small range, but they can rotate freely (due to backlash between each gear, etc.).

Therefore, from this state, the left and right side gears (21L).

(21R) to left and right braking side gear (26L), (26R)
When the gears (26L) and (26R) are engaged, the left and right brake gears (26L) and (26R) are slightly rotated so that the rotational phases match even if the rotational phases of the two do not match. do. As a result, the surface pressure generated on the contact surfaces of the gear teeth of both gears when they engage is relatively small. Therefore, when the main brake is turned off, the left and right side gears (21L), (21R) are activated by the spring (50) shown in FIG.
) is the left and right braking side gear (26L).

It easily separates from (26R) and engages with the transmission gear (19).

Also, as shown in Fig. 4, left and right side gears (21L).

(21R) engages with the transmission gear (19) during normal straight travel, the springs (49) installed in both the operating parts (46R) and (46L) have flexibility (A1) and (A2).
) is occurring. Therefore, when one of the left and right side gears (21L), (21R) is engaged with the left and right braking side gears (26L), (26R) in order to make a pivot turn in this state, (
(see Fig. 1), flexibility of the springs (49) installed in both operating parts (46R), (46L) (A1), (A2)
simply disappears, and the resistance from this spring (49) does not act.

〔Effect of the invention〕

As described above, even if you apply the main brake immediately after turning, the side gear will easily separate from the braking gear and engage the transmission gear when restarting, and the side gear will shift from the braking gear when restarting. This reduced the number of situations where the vehicle could not move forward due to being unable to move away from the vehicle, thereby improving the driving performance of the work vehicle.

Simply strengthening the spring (corresponding to the spring (50) in Fig. 4) that biases the side gear toward the transmission gear side will not work when sliding the side gear toward the braking gear side during a normal pivot turn. A large operating force is required to overcome the spring force.

However, in the present invention, the springs (corresponding to the springs (49) in FIG. 4) installed on both operating parts during normal turning
does not act as resistance, so the side gear can be slid with normal operating force and the operation is not particularly heavy.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 8 shows the structure inside the transmission case (8) of the traveling system of a combine harvester, which is one of the working vehicles.
The power from the hydrostatic continuously variable transmission (not shown) is transmitted through a belt transmission mechanism (not shown) equipped with a tension clutch.
The input of 1) is transmitted to −'J −(2), and
The power from the output shaft (3) of the hydrostatic continuously variable transmission (1) is transmitted from the first transmission Hi (4) via the one-way clutch (5-pin and output turn-!J-(7)) as shown in Fig. 9. It is transmitted to the reaping section (6) shown in FIG.

Power from the first transmission shaft (4) is transmitted to the second transmission shaft (11) via the first gear (9) and the second gear (10). A first high-speed gear (12) is fitted around the second transmission shaft (11) so as to be relatively rotatable, and a shift gear (14) is fitted onto the outside of the second transmission shaft (11) so as to be freely slidable.

On the other hand, the second high-speed gear (1
6) and low speed gear (17) are fixed, and the first high speed gear (
12) is engaged with the second high-speed gear (16), and the third
A medium speed gear (18) is fixed to the transmission shaft (15).

With the above structure, by sliding the shift gear (14) and engaging it with the first high speed gear (12), medium speed gear (18), and low speed gear (17), the power can be shifted into three stages: high, medium and low. This power is transmitted to the transmission side gear (19) that meshes with the medium speed gear (18).

A right side gear (21R) and a left side gear (2LL) are fitted onto the support shaft (20) that supports the transmission side gear (19) so as to be relatively rotatable, and the left and right axles (22L)
), (22R) input gear (23R), (23L)
are always engaged with the left and right side gears (21L) and (211?). As a result, the right or left side gear (21R), (2LL> is slid to engage and separate from the transmission side gear (19), and the drive sprocket of the crawler traveling device (24) shown in FIG. 9) (24a)
The transmission side gear (19) and the left and right side gears (21L) and (21R) perform important operations for power transmission.
A side clutch (25R) and (25L) are constructed between the two. Then, the left and right side gears (2
1L), (21R) are the left and right braking side gears (26
A spring (50) is provided separately from the transmission gear (26R) and biased toward the transmission gear (19).

Next, to explain in detail the structure for applying braking to one axle (22R) or (22L), as shown in the figure, the right braking side gear (26R) and the left braking side gear (26R) are attached to the support shaft (20). are relatively rotatably supported by bearings, and a pair of third gears (27) fixed to the fourth transmission shaft (27)
29) is the right braking side gear (26R) and main braking side gear 2
6 biting together. A multi-plate hydraulically operated side brake (28) is provided at one end of the fourth transmission shaft (27), and the right side gear (21R) or left side gear (21L) is separated from the transmission side gear (19). Braking can be applied to one axle (22R) or (22L) by engaging the right braking side gear (26R) or the left braking side gear (26L) and engaging and operating the handbrake (28). This allows a pivot turn.

Next, the structure for reversing one axle (22R) or (22L> will be described in detail. As shown in the figure, the third
The fourth gear meshing with the second high-speed gear (16) of the transmission shaft (15)
The gear (62) is fitted onto the fourth transmission shaft (27) so as to be relatively rotatable, and the fourth gear (62) and the fourth transmission shaft (27)
) is provided with a hydraulic clutch (30). This allows the right side gear (21R) or the left side gear (
21L) is engaged with the right brake side gear (26R) or the left brake side gear (26L) as described above, and when the hydraulic clutch (30) is engaged and operated, the second high speed gear (16) is engaged.
The power from the axle is transmitted to the axle (22R) or (22L) in a reversed state and decelerated to 1/2. This allows you to perform a super solid turn.

Next, the hydraulic cylinders (31R) and (31L) are used to slide the left and right side gears (21L) and (21R).
>, handbrake (28) and hydraulic clutch (30)
The hydraulic oil supply structure will be explained in detail. As shown in Figure 7, the hydraulic oil from the pump (32) is transferred to the first switching valve (33).
Left and right side gears (21L), (21R) via
Hydraulic cylinders (31R) and (31L) are supplied to the hydraulic cylinders (31R) and (31L).
The oil passage (34) from the side is connected to the second switching valve (35) for the hand brake (28) and the hydraulic clutch (30), and the oil passage (34) is connected to the second switching valve (35) for the hand brake (28) and the hydraulic clutch (30).
8) and a variable relief valve (36) for the hydraulic clutch (30). Further, the relief valve (61) maintains the pressure of the entire hydraulic circuit at a safe allowable pressure.

Next, the operations of the first switching valve (33), the second switching valve (35), and the variable relief valve (36) will be described in detail. As shown in Fig. 7, an operating lever (39) that can be operated forward, backward, left, and right, a first switching valve 33), a second switching valve <35), and a variable relief valve (36) are mechanically linked. , for example, move the operating lever (39) from the neutral position (N) to the first right turning position (
RI) or the first left turning position (Ll), the first
Only the switching valve (33) is operated and the hydraulic cylinder (31R
) or (311), the right or left operating section (46R
), (46L), and the right or left side gear (21R) that engaged with the transmission side gear (19).

(2LL) is operated away from the transmission side gear (19) and engages with the right or left braking side gear (26R), (26L).

In this case, the variable relief valve (36) is in a fully open state,
Since both the handbrake (28) and hydraulic clutch (30) are in the disengaged state, the right or left axle (22)
R), (22L) is cut off (side clutch (25R) or (25L) is disengaged),
The aircraft makes a slow turn to the right or left.

In addition, the sequence valve (47) provided in the oil passage 34)
) is right or left side gear (21R), (21L)
The hydraulic cylinder (?IR) applies the necessary pressure to fully engage the right or left braking side gear (26R), (26L).
, <31L).

Next, operate the left and right side gears (2LL) and (21R)! (46R) and (46L) will be explained in detail. Fifth
As shown in the figure and Fig. 6, a pair of support shafts (38R) and (38L) are rotatably supported on the front surface of the mission case (8), and a bifurcated arm is fixed to the inner end of the support shafts (38R) and (38L). (40R) and (40L) are engaged with the right and left side gears (21R) and (21L), respectively. L-shaped operating arms (41R) and (41L) are fixed to the outer ends of the support shafts (38R) and (38L), and the lower end sides of the operating arms (41R) and (4LL) are fixed to the outer ends of the support shafts (38R) and (38L). Hydraulic cylinder (31R).

By pushing down (31L), the right or left side gear (21R), (21L) will shift to the right or left braking side gear (21R).
6R).

It is configured to be slid to the (26L) side.

Next, move the operating lever (39) to the right or left first turning position (R1
), from (Ll) to the right or left second turning position (R2),
(L2), the right or left side gear (21
R).

(21L) is the right or left braking side gear (26R), (26
L), and the second switching valve (35) is operated to the hydraulic oil supply side to the side play valve 28), the variable relief valve (36) is gradually operated from the fully open state to the closed side. I'm going to be done. As a result, the handbrake (28) begins to act, and the right or left axle (22R) or (22L) is gradually braked, and the aircraft turns to the right or left. Then, the second right or left of the operating lever (39)
At the turning positions (R2) and (L2), the braking force of the handbrake (28) is maximum.

Next, move the operating lever (39) to the right or left third rotation position (R
3), (L3), the second switching valve (35) is operated to switch to the hydraulic oil supply side to the hydraulic clutch (30) in the state described above. This allows the handbrake (
28) is in the disengaged state, and the hydraulic clutch (30)
is engaged and the right or left axle (22R), (22
L) is driven in reverse, and the aircraft makes a sharp turn to the right or left.

Further, the third switching valve (37) for the hydraulic cylinder (60) for raising and lowering the reaping part (6) and the operating lever (39) are mechanically linked. This allows the operating lever (39)
(in the raised position or lowered position (upwards of the page or towards the back of the page)
By operating the reaping section (6), the reaping section (6) can be raised and lowered.

Next, the operating structure of the main brake (42) will be described in detail. As shown in FIG. 8, a main brake (42) is provided at the other end of the fourth transmission shaft (27), and as shown in FIG.
(corresponding to a brake operation section) are linked via a link (44). And left and right side gear (21L),
(21R) operation unit (46R).

(46L), the left operating arm (41L)
The outer wire (4) of the release wire (45) is connected to the upper end of the release wire (45).
5a) are connected, and a bracket (48) is attached to one end of the inner wire (45b) of this release wire (45).
8) Insert the right operating arm (41R) into the long hole (48a).
The pin (41Ra) is engaged.

Then, the inner wire (4) of the release wire (45)
The other end of 5b) is connected to the brake pedal (43). In addition, as shown in Fig. 4, both operating arms (41R)
, pin (51R) fixed to (41L), (51
L), left and right side gears (2LL), (21R
) is provided with a spring (49) that urges the third gear (19) toward the occlusal side. In this case, as shown in FIGS. 4 and 6, when the left and right side gears (2LL) and (21R) are in a straight-ahead state meshing with the transmission gear (19), the spring (
49) and both pins (51R) and (51L).
A, ), (A2) are configured so that they occur. or,
As shown in Fig. 5 and Fig. 4, the pin (51R), (5
The heads (51Ra) and (51La) of the springs (49) are oval shaped with some notches. ) with pin (51R).

(51L) so that it can be easily attached and detached.

With the above structure, the hydraulic cylinder (31L) and the operating part (46L) are used to turn left, for example, from the straight-ahead state shown in FIG.
) to connect the left side gear (2LL) to the left braking side gear (26
Even if the spring (49) is engaged as shown in Figure 1,
(A,) and (A2) are simply lost, and the spring (4
No resistance from 9) will work. This is the right side gear (2
The same applies to the slide operation of 1R). or,
Left and right side gears (21L), (21R) as mentioned above
During the sliding operation of the release wire (45), the accommodating effect of the elongated hole (48a) is simply lost, and the brake pedal (43) is not operated.

Next, the case where the brake pedal (43) is depressed at the end of a turn will be described in detail. For example, as shown in Figure 1, the left side gear (2LL) is replaced by the left braking side gear (26L).
the right side gear (21R) and the transmission side gear (
19) Left turn (turn on the ground or super turn on the ground)
Assume that at the end of the period, the hydrostatic continuously variable transmission (1) is stopped and temporarily stopped. In this case, in order to ensure safety during stopping and restarting, return the operating lever (39) to the neutral position (N), depress the brake pedal (43), and move the brake pedal (43) to the hook member ( Fix it with 52).

When the operating lever (39) is returned to the neutral position (N) in this way, the hand brake (28) and hydraulic clutch (30
) is cut off and both become disconnected, and both hydraulic cylinders (31R) and (31L) contract upwards, causing the fourth transmission shaft (27) to move, albeit within a small range. It will be able to rotate freely.

Then, as you step on the brake pedal (43), the release wire (43) will open as described in the [Function] section.
Due to the action of 5), the left side gear (2LL) is shifted from the left braking side gear (26L) (see Figure 2), and the left and right side gears (21L), (21R) are transferred again to the left and right braking side gears (26L), (26R) (see Fig. 3), the main brake (42) is engaged.

After that, when the brake pedal (43) is returned in order to restart the vehicle, the biasing force of the spring (49) installed across the operating arms (41R) and (41L) and the left and right side gears (2LL) and (21R) are activated. The left and right side gears (2L
L).

(21R) is the left and right braking side gear (26L), (26R)
As the side gears (21L) and (21R), which are left and right by the biasing force of the spring (50), move away from the transmission side gear (
19).

The present invention is not limited to those equipped with a crawler traveling device.
It can also be applied to wheeled work vehicles such as 8-wheel vehicles and 6-wheel vehicles.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the working vehicle according to the present invention, and FIG. 1 is a front view of the left and right side gears and the vicinity of the operating section showing a left-turning state in which the left side gear is engaged with the left braking side gear, and FIG. Fig. 3 is a front view showing a state in which the brake pedal is further depressed from the state shown in Fig. 2; Fig. 4 is a front view showing a state in which the brake pedal is further depressed from the state shown in Fig. 2; Fig. 4 shows that the left and right side gears are on the transmission side. A front view of the left and right side gears and the vicinity of the operating section in a straight-ahead state engaged with the gears, FIG. 5 is a perspective view of the operating section for the left and right side gears, FIG. 6 is a front view of the operating section and hydraulic cylinder, and FIG. 7 is a front view of each side gear. A hydraulic circuit diagram of the control valve, FIG. 8 is a longitudinal sectional front view of the transmission case, and FIG. 9 is a side view of the front part of the combine harvester. (19)...Transmission side gear, (21R), (2
1L)...Side gear, (24)...
Traveling device, (26R), (26L)...Brake side gear, (28)...Handbrake, (42
)... Main brake, (43)... Brake operation section, (45)... Release wire, (45
a) Outer wire of release wire, (
45b)...Inner wire of release wire, (46), (46L)...Operation unit, (49
), (50)... Spring, (A1), (A2
)...Flexibility.

Claims (1)

[Claims] Each of a pair of side gears (21R) and (21L) that transmits power to a pair of left and right traveling devices (24) and (24),
The engagement position with the transmission side gear (19) and the handbrake (2)
8), a pair of left and right braking side gears (26R), (26
a spring (50) that is slidably supported across the occlusal position with the transmission side gear (19) and urges the both side gears (21R) and (21L) toward the occlusion side with the transmission side gear (19); and both brakes. A working vehicle equipped with a main brake (42) that applies braking to a transmission system that interlocks and connects side gears (26R) and (26L), and a pair that slides each of the side gears (21R) and (21L). Operation section (46R), (46
One end of the inner wire (45b) of the release wire (45) is connected to one of the operating portions (46R),
(46L) to the other of the release wires (45).
, and the other end of the inner wire (45b) is connected to the main brake (
42) to the brake operating section (43) of the main brake (
42), both side gears (21R) and (2
The inner wire (45b) is connected to the brake operating section (46R) and (46L) so that the operating sections (46R) and (46L) are mutually operated until the operating section (46R) and (46L) engage the brake side gears (26R) and (26L).
43) side, and both operation parts (46R) and (46L) are configured to be pulled toward the transmission side gear (19).
) One of the side gears (21R) and (21L) is connected to the braking side gear (
Flexibility (A_1), (A_
2), both operation parts (46R), (46L)
A work vehicle has been erected over the area.