JP2559625Y2 - Work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a work vehicle provided with a pair of left and right traveling devices of a crawler type or a multi-wheel type.

[Conventional technology]

Some combine vehicles, which are one of the work vehicles, are provided with a pair of left and right crawler traveling devices so that transmission to one traveling device is interrupted and the direction of the machine body can be changed. The structure is as follows.

That is, as shown in FIG. 3, the left and right side gears (21R) and (21R) for transmitting power to the left and right traveling devices (not shown).
L) is engaged with the transmission gear (19) so that the power is applied to both traveling devices by the input gears (23R) and (23L) and the axle (22).
R) and (22L) flow in forward rotation, and the aircraft goes straight.

Then, for example, when the left side gear (21L) is slid and moved away from the transmission side gear (19) [FIG. 3 shows a state in which the left side gear (21L) is in mesh with the gear (26L), With the clutch (30) disengaged, the transmission shaft (2
7) is in a free rotation state), the transmission to the left traveling device is cut off, and the aircraft gradually turns to the left.

The parking operation in the above configuration is performed as follows. That is,
After sliding the left and right side gears (21R) and (21L) to engage them with the gears (26R) and (26L), the main brake (49) drives the transmission shafts of the gears (26R) and (26L). Park the aircraft by applying a brake to 27).

In this case, when the artificial operation tool (for example, a brake lever or a brake pedal) is mechanically linked with the main brake and the left and right side gears and the artificial operation tool is operated, the left and right side gears are shifted to the gears (26R) and (26L) shown in FIG. ), The main brake is turned on and operated at the same time.

[Problems to be solved by the invention]

In the above-described configuration, when the parking operation is performed by operating the artificial operation tool while the vehicle is traveling straight while the left and right side gears are engaged with the transmission side gears, the following phenomenon may occur.

That is, a wire is frequently used in a link mechanism that mechanically links the artificial operation tool and the left and right side gears, but a mechanical error is apt to occur in the link mechanism such as the wire. Therefore, when the human-made operating tool is operated during the straight traveling while the left and right side gears are engaged with the transmission side gear, the left and right side gears are not necessarily separated from the transmission side gear at the same time, and one side gear is separated from the transmission side gear. Later, a situation may occur in which the other side gear separates from the transmission side gear.

As a result, at the moment one of the side gears separates from the transmission side gear, the other side gear is still engaged with the transmission side gear and the power is flowing to the traveling device on the side gear side. The direction is changed, and the parking operation is performed in this state. Therefore, when restarting after the parking operation, the direction of the body must be corrected, which is troublesome.

An object of the present invention is to provide a parking operation that can be performed in the same direction without changing the direction of the body.

[Means for solving the problem]

In the present invention, for each of a pair of side gears for transmitting power to a pair of left and right traveling devices, a transmission side gear for receiving a forward rotation power for straight traveling is disposed, and the side gear is engaged with the transmission side gear and separated from each other. A main brake capable of braking the side gears, an artificial operating tool for the main brake, and a pair of the side gears capable of sliding each of the side gears to the separated position side. An operation unit is provided, and the artificial brake and the main brake and both operation units are linked by a linkage mechanism, and the main brake is turned on while the both side gears are separated from the transmission side gear by the operation of the manual operation unit. When one of the two operation units starts operating, a check mechanism that forcibly activates the other operation unit is provided between both operation units, and the operation unit is connected to the side gear. A pair of first operation arms that are linked and operated by a hydraulic cylinder, and a pair of second operation arms that are linked to a linkage mechanism, each of which is provided so as to be swingable around a pair of support shafts, The two hydraulic cylinders are arranged on one side of a line connecting the shaft centers of the two support shafts, and the connecting portions with the linkage mechanisms of the two second operation arms are also arranged on the same one side. Swinging operation of the first operation arm by the second operation arm;
The second operating arm and the first operating arm, and the hydraulic cylinder and the first operating arm, respectively, are configured in a one-sided contact interlocking structure so that the first operating arm can be rocked independently by the hydraulic cylinder. It is characterized by having been done.

[Action]

It is assumed that when an artificial operation tool is operated to perform a parking operation while traveling straight ahead, the operation unit for one side gear starts operating first due to a mechanical error in the linkage mechanism.

In this case, if the restraint mechanism of the present invention is provided, the operation of the operation part which has started to operate first is transmitted to the other operation part via the restraint mechanism, and the other operation part is forcibly so as not to be delayed. Actuated. As a result, the left and right side gears are substantially simultaneously separated from the transmission side gear, and thereafter the main brake is operated. Therefore, it is possible to prevent the body from changing direction during the parking operation, such as stopping the vehicle in the straight traveling state.

Then, a pair of first operation arms and a pair of second operation arms constituting the operation section are configured to swing around a common pair of swing support shafts, and a hydraulic pressure for operating the first operation arm is provided. Since the cylinder and the linkage mechanism connected to the second operation arm are arranged together on one side of a line connecting the pair of support shaft axes, the operation of the first and second operation arms on different sides is performed. The entire operation unit can be configured to be compact as compared with an arrangement in which the means are arranged.

In addition, the first operating arm, the second operating arm, and the hydraulic cylinder are each brought into contact with each other in a one-sided contact mode, so that the normal operation state in which the side gear is operated using the hydraulic cylinder for turning or the like, the brake pedal, and the like. There is no interference with the state in which the side gear is operated by the manual operation tool via the linkage mechanism, and each state can be used favorably.

[Effect of the invention]

As a result, when performing a parking operation, the left and right side gears can be separated from the transmission side gear at substantially the same time, so that the orientation of the aircraft does not change, and it is not necessary to correct the orientation of the aircraft at the time of restarting, which is annoying. In addition to the fact that it is no longer necessary, the operation of the left and right side gear operating units is directly controlled by each other, so the operation is reliable and highly reliable.

In addition, while being able to use the normal light operation state where the side gears are moved by the hydraulic cylinder and the temporary operation state using the manual operation device properly, the operation parts can be compactly configured and arranged in a narrow space. It became possible to save space and save space.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 shows a structure in a transmission case (8) of a traveling system of a combine, which is one of the working vehicles, and a power from an engine (not shown) is provided with a belt transmission mechanism (not shown) having a tension clutch. ) Is transmitted to the input pulley (2) of the hydrostatic continuously variable transmission (1), and the power from the output shaft (3) of the hydrostatic continuously variable transmission (1) is transmitted to the first gear pair. From (9), the power is transmitted to the cutting unit (6) shown in FIG. 2 via the one-way clutch (5), the first transmission shaft (4), and the output pulley (7).

Power from the first gear pair (9) is transmitted to the second transmission shaft (11) via the second gear (10). This second transmission shaft (1
In 1), a first high-speed gear (12) is externally fitted so as to be relatively rotatable, and a shift gear (14) is externally slidably fitted in a spline structure. On the other hand, a second high-speed gear (16), a medium-speed gear (18), and a low-speed gear (17) are fixed to the third transmission shaft (15), and the first high-speed gear (12) is connected to the second high-speed gear ( 16) Occluded.

With the above structure, the shift gear (14) is slid to operate the first high-speed gear (12), the medium-speed gear (18), and the low-speed gear (1).
By engaging with 7), the power can be shifted to three stages of high, medium, and low, and this power is transmitted to the third gear (19) (corresponding to the transmission side gear) that meshes with the middle speed gear (18). .

A right side gear (21R) and a left side gear (21L) are rotatably fitted on a support shaft (20) for supporting the third gear (19), and left and right axles (22R) and (22L). The input gears (23R) and (23L) of the left and right side gears (21
R), (21L) are always occluded. Thereby, the right or left side gears (21R) and (21L) are slid into and out of engagement with the third gear (19) by the sliding operation so that the driving sprocket (24) of the crawler type traveling device (24) shown in FIG. 24a), the power transmission ON / OFF operation is performed.
9) and the left and right side gears (21R) and (21L) constitute side clutches (25R) and (25L). Also, the left and right side gears (21R) and (21L) are each connected to a third gear (19).
A spring (69) for biasing the side is provided.

Next, a structure for braking one axle (22R) or (22L) will be described. As shown in FIG.
0), the right fourth gear (26R) and the left fourth gear (26L) are rotatably supported by bearings, and a pair of fifth gears (29) fixed to the fourth transmission shaft (27) is provided. It is in mesh with the fourth right gear (26R) and the fourth fourth gear (26L). A multi-disc hydraulically operated side brake (28) is provided at one end of the fourth transmission shaft (27). As a result, the right side gear (21R) or the left side gear (21L) is separated from the third gear (19) so that the right side gear (21R) or the left side gear (26L) is engaged with the right fourth gear (26R) or the left fourth gear (26L). ), One axle (22R) or (2
2L) can be braked. This is the pivot position.

Next, a structure for reversing one axle (22R) or (22L) will be described. As shown in FIG. 3, a sixth gear (37) engaging with the second high-speed gear (16) of the third transmission shaft (15).
Are externally rotatably fitted to the fourth transmission shaft (27), and a hydraulic clutch (30) is provided between the sixth gear (37) and the fourth transmission shaft (27). As a result, the hydraulic clutch (30) is engaged with the right side gear (21R) or the left side gear (21L) engaged with the right fourth gear (26R) or the left fourth gear (26L) as described above. When operated, the power from the second high-speed gear (16) is transmitted to the axle (22R) or (22L) in a reverse rotation state and reduced to half. This is a super-spinning state.

Next, a structure for driving one axle section (22R) or (22L) forward at a lower speed than the other will be described. As shown in FIG. 3, a first sprocket (13) is fixed to the third transmission shaft (15), and a second sprocket (38) is externally fitted to the fourth transmission shaft (27) so as to be relatively rotatable, A transmission chain (40) is wound around the first and second sprockets (13) and (38). A shift member (41) is externally fitted to the fourth transmission shaft (27) by a spline structure so as to be slidable. Thus, with the shift member (41) engaged with the second sprocket (38), the right or left side gear (21R), (21L) is shifted to the right or left fourth gear (26), (26).
L), the forward power from the third transmission shaft (15) is reduced by half and transmitted to the axle (22R) or (22L). The shift member (41) is provided with a spring (42) for urging the shift member (41) in a direction away from the second sprocket (38).

Next, a structure for supplying hydraulic oil to the hydraulic cylinders (31R) and (31L) for performing the sliding operation of the left and right side gears (21R) and (21L), the side brake (28), and the hydraulic clutch (30) will be described. As shown in FIG. 4, hydraulic oil from the pump (32) is supplied to the left and right side gears (21R) and (21L) via the first switching valve (33).
(31L) and the hydraulic cylinder (31R),
The oil passage (34) from the side of the (31L)
8) and second switching valve (35) for hydraulic clutch (30)
It is connected to the. Further, a variable relief valve (36) for the side brake (28) and the hydraulic clutch (30) is connected to the oil passage (34).

Next, operations of the first switching valve (33), the second switching valve (35), and the variable relief valve (36) will be described. As shown in FIG. 4, the first switching valve (33) and the variable relief valve (36)
Operation lever (39) for operation, and second switching valve (35)
And a switching lever (4) for operating the shift member (41) in FIG.
4) is provided. When the operating lever (39) is operated from the neutral position (N) to the first right turning position (R1) or the first left turning position (L1), only the first switching valve (33) is operated and the hydraulic cylinder (31R) is operated. ) Or (31L), the right or left side gear (21R) or (21L) that has been in mesh with the third gear (19) via the right or left operating part (53R) or (53L) is in the third position.
Away from the gear (19), the right or left fourth gear (26R),
(26L).

In this case, the variable relief valve (36) is fully open,
Since both the side brake (28) and the hydraulic clutch (30) are in the off state, the right or left axle (22R),
(22L) transmission is cut off [side clutch (25
R) or (25L) cutting state], and the aircraft gradually turns to the right or left. The sequence valve (47) provided in the oil passage (34) has a right or left side gear (21R), (21L) having a right or left fourth gear (26R), (26L).
The pressure required to completely occlude the hydraulic cylinder (31
R), (31L).

Next, in a state where the second switching valve (35) is operated at the supply position (35a) of the hydraulic oil to the side brake (28) [the pivot position of the switching lever (44)], the operating lever (39) is operated. From the right or left first turning position (R1), (L1) to the right or left second turning position (R2), (L2), the right or left side gear (21R), (21L) Right or left fourth gear (26
R), (26L), the variable relief valve (36)
Is gradually moved from the fully opened state to the closed side. As a result, the side brake (28) starts to act, and the braking is gradually applied to the right or left axles (22R) and (22L), so that the aircraft turns right or left. Then, at the right or left second turning position (R2) or (L2) of the operating lever (39), the braking force of the side brake (28) becomes maximum.

Next, the case where the second switching valve (35) is operated to the supply position (35b) of the hydraulic oil to the hydraulic clutch (30) [super turning position of the switching lever (44)] will be described. In this state, when the operating lever (39) is operated from the neutral position (N) to the right or left first turning position (R1) or (L1), the right or left side clutch (25R) or (25L) is operated as described above. The cutting state of appears.

Next, the operating lever (39) is moved to the right or left first turning position (R
From 1), (L1) to the right or left second turning position (R2), (L2)
The right or left side gear (21R), (2
1L) is engaged with the right or left fourth gear (26R), (26L), and the second switching valve (35) is operated to the hydraulic oil supply position (35b) to the hydraulic clutch (30). Then, as described above, the variable relief valve (36) is gradually operated from the fully open state to the close side. As a result, the hydraulic clutch (30) is engaged and the one of the traveling devices (24), (24) is driven to rotate in the reverse direction.

Next, when the switching lever (44) is switched to the gentle turning position, the shift member (41) in FIG.
8) and the second switching valve (3
5) is switched to the oil discharge position (35c). In this state,
Move the operating lever (39) to the right or left first turning position (R1), (L
Operate in 1) to move the right or left side gear (21R), (21
When L) is engaged with the right or left fourth gear (26R), (26L), the right or left axle (22R), (22L) is reduced to 1/2 and driven forward. As a result, the aircraft slowly turns right or left.

As shown in FIG. 3, a parking main brake (49) is provided at one end of the fourth transmission shaft (27). Next, an operation structure of the main brake (49) will be described. As shown in FIG. 1, the main brake (49) and the brake pedal (43)
(Corresponding to an artificial operation tool) are linked to each other via a wire (51) (corresponding to a link mechanism).

On the other hand, the operation units (53R) and (53L) for the left and right side gears (21R) and (21L) have a structure as shown in FIG. That is, a pair of support shafts (46R) and (46L) are rotatably supported on the front surface of the transmission case (8), and a bifurcated arm (not shown) fixed to the inner end thereof is provided on the right side. And the left side gear (21R), (21L). The first operation arms (50R) and (50L) are fixed to the outer ends of the support shafts (46R) and (46L).
When the hydraulic cylinders (31R) and (31L) depress the inner ends of the first operation arms (50R) and (50L), the right or left side gears (21R) and (21L) move to the right or left fourth gear ( The slide operation is performed to the (26R) and (26L) sides. Further, a spring (54) for urging the first operation arms (50R) and (50L) so as to be attracted to each other is provided.

A second operation arm (55R), (55L) is externally fitted to each of the support shafts (46R), (46L) so as to be relatively rotatable. Pins of the second operation arms (55R), (55L) are provided. (55Ra), (55
La) enters under each of the outer ends of the first operation arms (50R) and (50L). The second operation arm on the left (5
Release wire (45) at the upper end of L) (equivalent to linkage mechanism)
One end of the outer (45a) is connected. A bracket (48) is attached to one end of the inner (45b) of the release wire (45), and a pin (55Rb) of the second operation arm (55R) on the right side is attached to the bracket (48) and the elongated hole (48a).
Is involved. The other end of the inner (45b) of the release wire (45) is connected to the brake pedal (43).

Therefore, when the brake pedal (43) is depressed, the inner (45b) is pulled toward the brake pedal (43) and the left and right second operation arms (55R) and (55L) are rocked [right The second operation arm (55R) is counterclockwise on the paper surface, and the left second operation arm (55L) is clockwise on the paper surface]. Thus, the pins (55Ra) and (55La) of the left and right second operation arms (55R) and (55L) are connected to the first operation arms (50R) and (5R).
0L), the left and right first operating arms (50R) and (50L) are oscillated, and the left and right side gears (21R) and (21L) are moved to the right and left fourth gears (50L). 26
R) and (26L), and the main brake (49) is engaged and operated, and the left and right traveling devices (24) are braked. Then, parking can be performed by fixing the brake pedal (43) at the depressed position with the hook member (52).

In this case, as shown in FIG. 1, a long hole (55Rc) (corresponding to a restraint mechanism) is provided at the inner end of the right second operation arm (55R), and the left second operation arm (55L) is provided. A pin (55Lb) (corresponding to a restraint mechanism) is provided at the inner end, and the pin (55Lb) is inserted into a long hole (55Rc).

Accordingly, when the brake pedal (43) is depressed, for example, even if the right second operation arm (55R) starts to swing first, the engagement operation of the pin (55Lb) and the long hole (55Rc) causes Since the left second operation arm (55L) is also forcibly operated to swing, the left and right side gears (21R), (21
L) is almost simultaneously separated from the third gear (19). Accordingly, the transmission to the left and right traveling devices (24), (24) is cut off at substantially the same time, the aircraft stops without changing its direction, and the parking operation is performed.

In short, as shown in Fig. 1, both support shafts (46R), (4
6L) Two hydraulic cylinders (31R) and (31L) are arranged on one side of a line connecting the respective shaft centers, and both release arms (45R) and (55L) ) Is also arranged on the same side. Then, the first operation arm (50) by the second operation arms (55R) and (55L).
R), (50L) swing operation and hydraulic cylinder (31R), (3
1L) so that the swing operation of the first operation arm (50R) and (50L) can be performed independently of each other.
R), (55L) and the first operating arm (50R), (50L), and the hydraulic cylinders (31R), (31L) and the first operating arm (50L).
R) and (50L) are configured in a one-sided contact interlocking structure.

As shown in FIG. 4, an operation arm (61) for forcibly operating the second switching valve (35) to the oil discharge position (35c) is provided, and a brake pedal (43) and an operation arm (61) are provided. ), A link rod (62) is erected and the brake pedal (43) and the switching lever (44) are linked. As a result, when the brake pedal (43) is depressed, the main brake (49) is turned on as described above, and the second switching valve (35) is switched to the oil discharge position (35c). 44) is operated to the pivot position.

The wheels (56) of the traveling devices (24), (24) have a structure as shown in FIGS.

That is, an inner ring (57) having a plurality of sets of outward projections (57a) and an outer ring (58) having a plurality of sets of inward projections (58a) are prepared. And the inner ring (5
7) Insert it and rotate it slightly.
The projection (58a) of the outer ring (58) is located between 7a), and the rubber (59) is poured between the inner ring (57) and the outer ring (58) for baking.

Note that, in the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the structure of the attached drawings by the entry.

[Brief description of the drawings]

The drawings show an embodiment of the work vehicle according to the present invention, FIG. 1 is a diagram showing a linked state between a brake pedal and a main brake and left and right operation parts, FIG. 2 is a side view of a front half of a combine, FIG. FIG. 4 is a longitudinal sectional front view of a transmission case, FIG. 4 is a hydraulic circuit diagram for a side brake and a hydraulic clutch, etc. FIG. 5 is a side view of a wheel of a traveling device, and FIG.
It is sectional drawing from A direction. (19) ... transmission side gear, (21R), (21L) ... side gear, (24) ... traveling device, (31R), (31L) ... hydraulic cylinder, (43) ... artificial operation tool, ( 45), (51) ... Linkage mechanism, (49) ... Main brake, (50R), (50L) ...
1st operation arm, (53R), (53L) ... operation section, (55
R), (55L) ... second operation arm, (55Rc), (55Lb)
…… Check mechanism.

Claims (1)

(57) [Scope of request for utility model registration] A transmission-side gear (21) for receiving a forward rotation power for straight traveling with respect to a pair of side gears (21R) and (21L) for transmitting power to a pair of left and right traveling devices (24) and (24). 19)
A working vehicle, wherein the side gears (21R) and (21L) are configured to be independently slidable over a transmission-side gear (19 and a separation position with the transmission-side gear (19). (21R) and (21L) can be braked by the main brake (49),
3) and a pair of operating portions (53) that can slide each of the side gears (21R) and (21L) to the separated position side.
R) and (53L) are provided, and the artificial operation tool (43) is linked with the main brake (49) and both operation sections (53R) and (53L) by linking mechanisms (45) and (51). The main brake (49) is operated while the both side gears (21R) and (21L) are separated from the transmission side gear (19) by operation of the artificial operation tool (43), When one of the two operation units (53R) and (53L) starts operating, the restraint mechanisms (55Rc) and (55Lb) that forcibly operate the other are also connected to the two operation units (53R) and (53R). 53L)
Between the side gears (21R) and the operation units (53R) and (53L).
R), (21L) and the hydraulic cylinder (31
R) and (31L) operated by a pair of first operation arms (50
R), (50L) and a pair of second operation arms (55R), (55L) to which the linkage mechanism (45) is connected around a pair of support shafts (46R), (46L), respectively. The two hydraulic cylinders (31) are provided on one side of a line connecting the shaft centers of the two support shafts (46R) and (46L).
R) and (31L), and a connecting portion of each of the second operating arms (55R) and (55L) with the linking mechanism (45) is also disposed on the same side of the same side. The swing operation of the first operation arms (50R) and (50L) by the arms (55R) and (55L) and the first operation arm (50) by the hydraulic cylinders (31R) and (31L)
R) and (50L), so that the second operation arms (55R) and (55L) and the first operation arms (50R) and (50L), and the hydraulic cylinder (31
R), (31L) and the first operating arms (50R), (50L) are each configured as a one-sided contact interlocking structure.