JPH0245276A - Working vehicle - Google Patents

Abstract

PURPOSE:To allow a working vehicle to cope with each turning form while to maintain the operation performance by providing it with a reverse transmission mechanism driving one of running devices in the reverse direction with respect to the other. CONSTITUTION:In a working vehicle equipped with a crawler device, there are provided with side clutches 25R, 25L blocking the transmission of power to a pair of right and left running devices, a side brake 28 braking the devices, respectively, a reverse transmission device driving one of the devices in the reverse direction with respect to the other. The control side clutche 25R or 25L is OFF-controlled when a control lever 39 is controlled from a neutral position to a first set control position, while the control side running device is brake-controlled when it is operated over the first set control position into a second set control position. Further, when it is operated over the second set control position, the lever 39 and side clutches 25R, 25L; and the side brake 28 and the reverse transmission mechanism 30 are, respectively, interlocked so that the control side running device is driven reversely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a work vehicle equipped with a traveling device such as a crawler traveling device that cannot be independently steered.

[Conventional technology]

In the combine harvester, which is one of the above-mentioned work vehicles, as disclosed in Japanese Utility Model Application No. 62-145885, when one operating lever is tilted to the right by a set angle, the crawler traveling device on the right side is moved. The power transmission is cut off and the aircraft slowly turns to the right (side clutch disengaged), and when the control lever is pushed further to the right, the right crawler traveling system is braked and the aircraft turns to the right (side clutch disengaged). There are things that are configured to go handbrake (person state).

[Problem to be solved by the invention]

However, with the diversification of work formats, as mentioned above, there are cases where it is not sufficient to respond to various work formats by just pivoting while applying braking to one traveling device. If you continue turning for a long time while applying this, the ground will be roughened by the running gear on the stationary side.

The present invention has been made with attention to the above-mentioned problem, and an object of the present invention is to provide a structure that can accommodate various turning modes while maintaining operability.

[Means to solve the problem]

The present invention is characterized in that, in the above-mentioned work vehicle, a side clutch that cuts off power transmission to one of the pair of left and right traveling devices;
It is equipped with a handbrake that applies braking to one traveling device, a reversing transmission mechanism that drives one traveling device in the opposite direction, and when the operating lever is moved from the neutral position to the first set operating position, the operating side When the side clutch is disengaged and the operating lever is operated beyond the first set operating position and within the second set operating position, the traveling device on the operating side of the operating lever is braked, and the operating lever is moved to the second set operating position. The operation lever, side clutch, handbrake, and reverse transmission mechanism are linked together so that when the operation lever is operated beyond this point, the traveling device on the operation side of the operation lever is driven in reverse.The operation and effects are as follows. It is as follows.

[For production]

As mentioned above, by being equipped with a reverse transmission mechanism that drives one traveling gear in the opposite direction to the other traveling gear, it is possible to make gentle turns by disengaging the side clutch and turning by engaging the handbrake. Three types of turning forms are available: turning and super turning by reversing one of the traveling devices, and it becomes possible to select an appropriate turning form according to the conditions of the work ground and the work situation.

These three types of turning modes can now be performed with a single operating lever, and since turning with one traveling gear reversed will not disturb the ground much, it is possible to turn on and off the handbrake. There is no need to forcefully use multiple pivot turns, and by using super pivot turns at the right time, it is possible to reduce the roughness of the ground.

〔Effect of the invention〕

As described above, three different swing modes, which are more than the conventional configuration, can be obtained with a single operating lever, allowing for various types of work without impairing the operability of the swing operation and without disturbing the ground. It became possible to turn according to the situation and the working surface, improving driving performance.

〔Example〕

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

Figure 13 shows the structure inside the traveling transmission case (8) 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.
1) is transmitted to the human cub-IJ-(2),
The power from the output shaft (3) of the hydrostatic continuously variable transmission (1) is transmitted from the first transmission shaft (4) to the one-way clutch (5) and the output shaft! It is transmitted to the reaping section (6) shown in FIG. 14 via J-(7).

The 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), and the second transmission shaft (11) A first high speed gear (12) and a first low speed gear (13) are fitted on the outside so as to be relatively rotatable, and a shift gear (14) is fitted on the outside so as to be freely slidable with a spline structure.

On the other hand, the second high speed gear (16) and the second low speed gear (17) fixed to the third transmission shaft (15) mesh with the first high speed gear (12) and the first low speed gear (13). A medium speed gear (18) is fixed to the third 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 first low speed gear (13), the power can be shifted into three stages: high, medium and low. This power is transmitted through a medium speed gear (18
) is transmitted to the third gear (19) that meshes with the third gear (19).

The support shaft (20) that supports the third gear (19) includes a right side gear (21R) and a left side gear (21L).
is fitted on the outside so that it can rotate freely, and the left and right axles (2
2L), (22R), manual gear (23R), (23
L) is always engaged with the left and right side gears (21L) and (21R). As a result, the right or left side gears (21R) and (21L) are slid relative to the third gear (19) to engage and separate, and the sprocket of the crawler traveling device (24) shown in FIG. 14) (24a)
) performs important power transmission operations, and the third gear (1
9) and the left and right side gears (21, (21R)) constitute side clutches (25R) and (25L).

Next, the structure for applying braking to one axle (22R) or (22L) will be described in detail.As shown in the figure, the fourth right gear (26R) and the fourth left gear (26R) are connected to the support shaft (20).
L) is relatively rotatably supported by a bearing, and a pair of fifth gears (29) are fixed to a fourth transmission shaft (27).
meshes with the right fourth gear (26R) and the left fourth gear (26L). A multi-plate hydraulically operated handbrake (28) is provided at one end of the fourth transmission shaft (27), and is connected to the right side gear (21R) or the left side gear (21R).
L) is separated from the third gear (19) and the right fourth gear (26
R) or left fourth gear (26L),
By operating the handbrake (28), braking can be applied to one axle (22R) or <22L).

Next, the reversing transmission mechanism (30) for reversing one axle (22R) or (22L) will be described in detail.As shown in the figure, the second high-speed gear (16) of the third transmission shaft (15)
A sixth gear (62) meshing with the fourth transmission shaft (27) is fitted onto the fourth transmission shaft (27) so as to be relatively rotatable, and a reverse transmission mechanism ( A hydraulic clutch as 30) is provided.

As a result, when the hydraulic clutch (30) is operated greatly with the right side gear (21R) or left side gear (21L) engaged with the right fourth gear (26R) or left fourth gear (26L) as described above, 2nd high speed gear (16)
The power from the axle is transmitted to the axle (22R) or (22L) in a reversed state and decelerated to 1/2.

Next, the hydraulic cylinders (31R) and (31L) are used to slide the left and right side gears (21L) and (21R).
), hand brake (28) and hydraulic clutch (30
), as shown in Fig. 1, the hydraulic oil from the pump (32) is supplied to the first switching valve (3
3) Left and right side gears (21L), (21R)
Hydraulic cylinder for (31R), (31L)
Hydraulic cylinder (31R), (3
The oil passage (34) from the side of the handbrake (2L)
8) and the second switching valve (3) for the hydraulic clutch (30).
5), and a variable relief valve (36) is further connected to the oil passage (34). Also, IJ IJ-fu valve (
61) is to maintain the pressure of the entire hydraulic circuit at a safe permissible pressure.

Next, the first switching valve (33), the second switching valve (35), the variable I
The operation structure of the J IJ-F valve (36) will be described in detail. As shown in Fig. 2, the frame body is swingably supported around the left and right axis (P,) of the aircraft control section (not shown). An operating lever (39) is swingably supported around the longitudinal axis (P2) of (38), so that the - operating lever (39) can be pivoted back and forth and left and right.

A first arm (40) is fixed to this operating lever (39), and this first arm (40) and a first switching valve (39) are fixed to each other.
3) are linked. This structure is located at the front and rear axis (P3) of the mission case (8) as shown in Figure 2.3.4.
There is an operation plate 43) on the front and back of the support shaft (41) that can be rotated around it.
and the arm (41a) are fixed, one arm (41a) is connected to the spool (not shown) of the first control valve (33), and the other operation plate (43) is connected to the actuator (42). has been done.

A long hole (43a) is provided in the operation plate (43),
The pin (45a) of the bushing full wire (45) connected to the first arm (40) of the operating lever (39) is engaged with this long (43a), and furthermore, the pin (45a) of the bushing full wire (45) is
5a) and the pin (43b) of the operation plate (43).

With the above structure, the front and rear axis (P
2) By swinging the surroundings, the bushing full wire (45
) is pushed or pulled, the operation plate (43) and arm (41a) are swung through the helical spring (44), and the first switching valve (33) is switched. Even after the spool of the first switching valve (33) reaches the stroke end, the operation lever (39) can be further oscillated by the flexibility of the helical spring (44) and the elongated length (43a). . As a result, hydraulic oil is supplied to one hydraulic cylinder (31R) or <31L), the piston (31RP) or (311P) protrudes downward, the side gear arm (46R) or (46L) is oscillated, and the right side gear (21R) or left side gear (
21L) is separated from the third gear (19), and the right fourth gear (21L) is separated from the third gear (19).
6R) or left 4th gear (26L). This is the cut state of the left and right Zydocra notches (25L) and (25R).

In addition, as shown in Fig. 1, a hydraulic cylinder (31R) (31
Sequence valve (4) provided in the oil path (34) from L)
7), the left and right side gears (21L), (21R)
The pressure required to completely engage the left and right 4th gears (26L) and (26R) is the pressure required for the hydraulic cylinders (31R) and (3
1L). As shown in FIG. 5, when the piston (31RP> or (31LP>) starts to protrude downward, the cylinder (31, R3), (31
This is to open the oil passage (34) connected to LS).
゛The position where this oil passage (34) starts to open (left and right side gears (21L), (21R) is the left and right 4th gear (26L),
(26R) at a position where it does not completely engage the piston (
31RP) and (31LP) from stopping.

The actuator (42) is for automatically switching the first switching valve (33) when the aircraft automatically travels along the planted culm, and is operated by the operating lever (39) as described above. It is in a state where it can move freely during manual operation.

Also, as shown in FIG. 5, there is a hydraulic cylinder (31R).

The inner diameter of the oil passage (34) portion (31a) on the inner surface of the cylinder (31R3) and (31LS) of (31L) is cut to be slightly larger.
4) When the hydraulic oil is drained from the cylinder (31R3), (
This is to ensure that the hydraulic oil drains as evenly as possible from the radial direction of the pistons (31RP) and (31LP) to prevent twisting caused by uneven contact between the pistons (31RP) and (31LP).

Next, the linkage structure between the operating lever (39), the second switching valve (35), and the variable IJ valve (36) will be explained in detail. The second arm (49) equipped with the pin (49a) is fixed, and the first swing arm (50) and the second swing arm (51) move around the front-rear axis (R2) to rotate the operating lever (3).
9) is supported so that it can swing freely. A fixed arm (
The pin (38b) of 38a) is connected to the first and second swing arms (5
0), (51), and the spring (52) is inserted between the first and second swing arms (50), (51).
The inner wire (53a) of the release wire (53) is attached to the first swinging arm (50), and the outer wire (53b) is attached to the second swinging arm (50).
51).

On the other hand, as shown in Fig. 6.7.8, the second switching valve (
35) and a variable relief valve (36) are arranged in parallel, and an axis (R4) perpendicular to the spools (35a) and (36a) of the second switching valve (35) and the variable relief valve (36).
) is rotatable around the support shaft (54), and the first operation arm (48) is located on the outside of the support shaft (54).
5) is fixed. Then, the release wire (
The inner wire (53a) of the spring (53)
6) to the second operating arm (55). The state shown in Fig. 8 and Fig. 2 is the state shown in Fig. 8 and Fig. 2.
) is being operated to the neutral position W (N), and the pin (55a) of the second operating arm (55) and the spring (56
) and the pin (53a) of the inner wire (53a).
C) flexibility (AI) between the spring (56) and the spring (56);
(A2) is occurring. Further, the second imitation arm (55) and the first operating arm (48) are biased clockwise in FIG. 8 and counterclockwise in FIG. 6 by a helical spring (63).

As shown in Fig. 2, move the operating lever (39) to
2) When the right side clutch is turned down, for example, to the disengaged side, the second swing arm (51) comes into contact with the pin (38b) and is stopped, and the pin of the second arm (49) (4
9a), the first swing arm (50) is swing operated and the inner wire (53a) is pulled.
Conversely, if the operating lever (39) is operated to disengage the left side clutch, the second swing arm (51) will be operated to swing while the first swing arm (50) is stopped by the pin (38b). Even in this state, the inner wire (53a) is pulled against the outer wire (53b). However, even if the operating lever (39) is operated by swinging between the right side clutch disengaged position and the left side clutch disengaged position, the flexibility shown in Fig. 8 (^l), (A2)
(see Fig. 9), and within this range, the first switching valve (33
) is operated and the left and right side clutches (25L), (25
Only important operations of R) are performed.

Then, move the operating lever (39) to the left and right side clutches (2
5L), <25R) and move to the right or left braking position, the pulling action of the inner wire (53a) causes the first operation to change from the state shown in Fig. 6 to the state shown in Fig. 10. The arm (48) is operated to swing, and the spool (36a) of the variable relief valve (36) is pushed toward the throttle opening closing side by the first contact portion (48a) of the first operating arm (48). (See Figure 12). In this operating range, the first operating arm (48) does not come into contact with the spool (35a) of the second switching valve (35).
5) is a hydraulic oil supply side (
In Figure 6.10, the spool (35a) right protruding side)
is maintained. Therefore, as shown in FIGS. 2 and 12, by tilting and operating the operating lever (39) from the left and right side clutch disengaged positions, the braking force of the handbrake (28) can be gradually increased. It is.

When the operating lever (39) is moved from the right or left braking position to the right or left reverse position, the inner wire (
53a) is further pulled, and the first operating arm (48) changes from the state shown in FIG. 10 to the state shown in FIG.
The first contact portion (48a) of the variable relief valve (36
) is further pushed in, while the spool (35a) of the second switching valve (35) is pushed in by the second contact portion (48b) of the first operating arm (48), and the second switching valve (35) is a hydraulic clutch for reverse rotation (30
) is operated on the hydraulic oil supply side to one crawler running bag f.
fi (24) is driven in the reverse direction while being decelerated to 1/2 (see FIGS. 2 and 12).

As shown in FIGS. 1 and 2, the operating lever (39
) and the frame (38) swingably around the left and right axis (Pl), and a third switching valve (37) for the hydraulic cylinder (60) for lifting and lowering the reaping part (6). ) are mechanically interlocked and connected, and by swinging the operating lever (39) around the left and right axis (Pl), the reaping part (
6) can be raised and lowered.

In addition, this machine is equipped with a check mechanism that prevents one of the crawler traveling devices (24) from being reversed to make a super turn while traveling at high speed.The detailed structure of this mechanism is shown in Figure 8. As shown in the figure, a fan-shaped restraining member (65) is supported, which can swing freely around the horizontal axis (P,) and is biased counterclockwise in the drawing by a helical spring (64).

On the other hand, the first shift lever (66) for changing the swash plate angle in the hydrostatic continuously variable transmission (1) and the check member (
65) are connected to each other via the inner wire (67a) of the release wire (67). A second speed change lever (68) for sliding the shift gear (14) in FIG. 13 is connected to the outer wire (67b) of the release wire (67).

With the above structure, the first shift lever (66) can be moved to the high speed position (
When operated to the H') side, the inner wire (67a) is pulled and the check member (65) rotates clockwise in the drawing, and the first shift lever (66) is moved to the high speed position (H').
') side exceeds the setting, the second operation arm (
A check member (6) is placed within the trajectory of the bottle (55b) inside the bottle (55).
5) enters. As a result, the first and second operating arms (48) and (55) can be operated to the braking position (the state shown in Fig. 10), but further operation to the reverse position (the state shown in Fig. 11) is prohibited. Bottle (55b) restraining member 65)
This becomes impossible due to contact with the

The state shown in Fig. 8 is a state in which the first shift lever (68) and the second shift lever (68) are operated to the low speed position (L'), (L). Move the 2-speed lever (68) to the medium speed position (M) and the high speed position (It).
), the outer wire (67b) is operated and the inner wire (67a) is pulled, and the check member (65) moves to the medium speed position (M) and the high speed position (H). Rotate clockwise on the page to the corresponding position. In other words, the more the second shift lever (68) corresponding to the auxiliary shift is operated to the high speed side, the more the first shift lever (66) corresponding to the main shift is operated from the low speed position (J) to the high speed position (Ho). When moving, one crawler traveling device (24)
This will quickly lead to a situation in which it will not be possible to perform a super pivot turn by reversing the position.

As shown in FIGS. 1 and 15, the third switching valve (37) includes a pump port (37a), a drain port (37b), and a supply port (37c) communicating with the hydraulic cylinder (60). , is equipped with a check valve (37d), and grooves (37f) and (37g) as throttle parts of different lengths are provided on the outer peripheral surface of the spool (37e) (lower than the upward groove (37f)). The side groove (37g) is lengthened). With this, when operating the spool (37e) of the third switching valve (37) from the neutral stop position to the ascending side or descending side, the hydraulic oil is made to pass through the groove (37f) or (37g) during the operation, The reaping part (6) can be moved up and down slowly.

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 work vehicle according to the present invention, and Fig. 1 is a hydraulic circuit diagram showing the connection state of the 1.2.3 switching valve, hydraulic cylinder, and variable relief valve in a combine harvester, and Fig. 2 shows the operating lever. A perspective view showing the nearby structure, Figure 3 is a front view of the operating system of the first switching valve and the hydraulic cylinder, and Figure 4 is a front view of the first switching valve.
A longitudinal side view showing the operation system of the switching valve, Fig. 5 is a longitudinal front view of the hydraulic cylinder, and Fig. 6 shows the second switching valve, variable IJ IJ
- A longitudinal sectional front view showing the operating system of the second selector valve and its operating system, corresponding to the state in which the operating lever in Fig. 2 is operated to the neutral position, and Fig. 7 is a longitudinal sectional side view showing the operating system of the second switching valve and the variable relief valve. 8 shows the operation system of the second switching valve and the variable relief valve, and the front view (rear view relative to FIG. 6) and FIG. The figure shows the second switching valve and variable +11J corresponding to when the operation lever in Figure 2 is operated to the right or left side clutch disengaged position.
- A front view of the operating system of the valve, Fig. 10 is a front view of the operating system of the valve, and Fig. 10 shows the second
Figure 11 is a vertical cross-sectional front view of the switching valve, variable IJ IJ-F valve and its operating system, and shows the second switching valve, variable relief valve and A longitudinal sectional front view of the operating system, Fig. 12 is a diagram showing the relationship between the operating pressure of the handbrake and hydraulic clutch and the operating angle around the longitudinal axis of the operating lever, and Fig. 13 is a longitudinal sectional front view of the transmission case of the combine harvester. , FIG. 14 is a side view of the front half of the combine, and FIG. 15 is a cross-sectional plan view of the third switching valve. (24)... Traveling device, (25R), (25
L)...Side clutch, (2g)...
・Handbrake, (30)... Reverse transmission mechanism 1, (39)... Operation lever (N)...
...neutral position.

Claims (1)

[Claims] side clutches (25R), (25L) that cut off power transmission to one of the pair of left and right traveling devices (24), (24);
A handbrake (28) that applies braking to one traveling device (24), (24), one traveling device (24), (24)
) in the opposite direction to the other.
), and the operation lever (39) is set to the neutral position (N
) to the first setting operating position, the operating lever (39
) is disengaged and the operating lever (39) is operated beyond the first set operating position and within the second set operating position, the operating lever (39) is operated. When the side traveling devices (24), (24) are operated for braking and the operating lever (39) is operated beyond the second set operating position, the operating side traveling devices (24), (24) of the operating side of the operating lever (39) are operated beyond the second set operating position. ) so that the control lever (39) and side clutches (25R) and (25L) are driven in reverse.
, a work vehicle in which a handbrake (28) and a reverse transmission mechanism (30) are linked.