JPH0442602Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is configured so that the main transmission for driving is switched by operating the main transmission valves of a plurality of hydraulically operated clutches. The auxiliary transmission is configured by including a one-way clutch that transmits only rotational force in a specific rotational direction to the lowest speed transmission mechanism among the plurality of transmission mechanisms that interlock the input shaft and the output shaft, and The present invention relates to a traveling transmission device for a working vehicle, in which the transmission mechanism other than the transmission mechanism for the lowest speed is provided with a hydraulically operated clutch operated by an auxiliary transmission valve.

[Conventional technology]

The above-mentioned work vehicle is constructed so that the sub-transmission device for traveling can be easily shifted and has a simple structure. That is, when the hydraulically operated clutch is disengaged, the rotational force of the input shaft is transmitted to the output shaft at a low speed by a transmission mechanism equipped with a one-way clutch, and when the hydraulically operated clutch is engaged, the rotational force of the input shaft is transmitted to the output shaft at a low speed by a transmission mechanism equipped with a one-way clutch. Due to the difference between the transmission ratio of the transmission mechanism and the transmission mechanism with a one-way clutch, the rotational force of the input shaft is prioritized by the transmission mechanism with a hydraulically operated clutch over the transmission mechanism with a one-way clutch. By transmitting high-speed transmission to the output shaft, it is possible to change gears by simply switching the sub-shift valve, and only the transmission mechanisms other than the lowest speed among the multiple transmission mechanisms are equipped with hydraulically operated clutches. That's all you need.

In this type of auxiliary transmission for traveling, even if the transmission mechanism other than the one for the lowest speed is set to the disengaged state by disengaging the hydraulically operated clutch, the transmission mechanism with a one-way clutch for the lowest speed remains in the transmission state. In some cases, the transmission cut state does not appear, which has conventionally caused the following inconveniences.

[Problem that the invention attempts to solve]

For example, if the parking brake is not applied and the vehicle is parked only by operating the main gear shift operating tool to the neutral position, the operator's body may come into contact with the control section when getting on or off the vehicle or inspecting the working section. There was a risk that the main gear shift operating tool would switch to the transmission position, causing the aircraft to start moving.

An object of the present invention is to simplify the countermeasure structure and make it easier to avoid starting the aircraft due to unexpected switching of the gear shift operating tool.

[Means for solving problems]

A characteristic configuration of the present invention is that, in the above-mentioned traveling transmission device for a work vehicle, the auxiliary shift operating tool is provided with a first minimum speed position and a second minimum speed position, and all of the hydraulic operations for the main shift are provided with a first minimum speed position and a second minimum speed position. A releasable cutting operation mechanism that acts on the type clutch is automatically activated when the auxiliary shift operating tool is in the first lowest speed position, and is in an operating position other than the first lowest speed position. The device is linked to the auxiliary shift operating tool so that when the auxiliary shift operating tool is present, the operation is automatically released, and its functions and effects are as follows.

[Effect]

When the main shift operating tool is operated to the neutral position and the auxiliary shift operating tool is operated to the first lowest speed position, the main shift operating tool is switched to the transmission position and the main shift valve is activated by the hydraulically operated clutch. Even if the switch is switched to the operating position where the main shift valve is engaged, if the auxiliary shift operating tool is in the first lowest speed position, the switching operation mechanism is in the operating state, and regardless of the switching of the main shift valve, all The hydraulically operated clutch is operated to maintain the main transmission in the neutral state. Even if the auxiliary shift operating tool is switched to an operating position other than the first lowest speed position and the switching operating mechanism is switched to the deactivated state,
When the main shift operating tool is in the neutral position, the main shift valve is in the neutral position and all hydraulically operated clutches are operated to disengage to maintain the main transmission for driving in the neutral state.

[Effect of idea]

Even if one of the main shift operating tool and the auxiliary shift operating tool is switched to the transmission position or to a position other than the first minimum speed position, if the other is in the neutral position or the first minimum speed position, the main transmission for traveling is maintained in a neutral state, and it is extremely unlikely that an unexpected switching operation will be applied to both the main gear shift operating tool and the auxiliary shift operating tool. This makes it extremely unlikely that the aircraft will fly off the ground, resulting in an excellent safety feature.

By using the gear shifting clutch of the main transmission for driving as a clutch to maintain the transmission disengaged state even if the main gear shifting operating tool is unexpectedly switched, the structure has been improved so that a special clutch for safety is not required. It was simplified and economically advantageous.

〔Example〕

As shown in FIG. 3, the pre-processing section 4 is equipped with a crawler-type pre-processing section 4 that has a pulling device 1 that acts on the planted grain culms, a reaping device 2, and a vertical conveyance device 3 that conveys the reaped grain culms to the rear of the machine. A combine harvester is constructed by equipping the front part of a traveling machine body having a traveling device 5, a threshing section 6, a control section 7, etc.

As shown in FIG.
The rotation output of the engine 8 is transmitted to the threshing section drive shaft 10 via the belt tension type threshing section clutch 9, and the belt tension type main clutch 1 is transmitted to the threshing section drive shaft 10.
1 to the input shaft 13 of the transmission case 12, and is capable of switching the rotational force of the input shaft 13 between high and low speeds in two stages, and a belt tension type transmission 14. The rotational force of the input shaft 13 is transmitted via the pre-processing section clutch 15 to the pre-processing section drive shaft 16, and the rotational force of the input shaft 13 is transmitted via the auxiliary transmission for traveling 17 to the main transmission for traveling. The output of the main transmission 18 is transmitted to the left crawler drive shaft 20a via the machine direction clutch 19a, and the machine direction clutch 19b.
The signals are transmitted to the right side crawler drive shaft 20b through the respective right side crawler drive shafts 20b.

The main transmission for traveling 18 is constructed as follows.

In other words, as shown in FIG. a second forward gear 26 that meshes with the second output gear 25 of the auxiliary transmission 17;
between the second intermediate shaft 27 that is interlocked with the output gear 23; between the third forward gear 28 that meshes with the second output gear 25 and the first intermediate shaft 24;
A reverse gear 29 meshing with the forward gear 22 and the second
A first clutch 30, a second clutch 31, a third clutch 32, or a fourth clutch 33 are connected between the first hydraulic cylinder 34 and the intermediate shaft 27, respectively.
Alternatively, it is provided so as to be operated by the second hydraulic cylinder 35, the third hydraulic cylinder 36, or the fourth hydraulic cylinder 37. Then, the four hydraulic cylinders 34 to 37 are operated to engage the clutch by being supplied with oil, and as shown in FIG.
The four clutches 3 are configured to be operated by a main shift valve 38 consisting of a valve portion 38b, and the four clutches 3 are operated by a switching operation of the main shift valve 38.
The gears are changed by operating from 0 to 33.

Specifically, the first valve portion 38a and the second valve portion 38b are interlocked by an interlocking mechanism 40 such that they are operated in conjunction with the main shift operating tool 39, and the main shift operating tool 39 is moved to the first operating position. When operated to N, the first valve part 38a and the second valve part 38b
becomes the first operating position n, and all of the clutches 30 to 33 are disengaged and are in a neutral state.

When the main shift operating tool 39 is operated to the second operating position _F1 , the first valve section 38a and the second valve section 38
b is in the second operation position _f1 , and the said second clutch 30
only the gear is engaged, and the transmission state is set to the first forward speed.

When the main shift operating tool 39 is operated to the third operating position _F2 , the first valve section 38a and the second valve section 38
b becomes the third operating position _f2 , and the second clutch 3
Only the gear 1 is engaged and becomes the transmission state of the second forward speed.

When the main shift operating tool 39 is operated to the fourth operating position _F3 , the first valve section 38a and the second valve section 38
b becomes the fourth operating position _f3 , and the third clutch 3
Only gear No. 2 is engaged, resulting in the third forward speed transmission state.

When the main shift operating tool 39 is operated to the fifth operating position R, the first valve section 38a and the second valve section 38
b becomes the fifth operating position r, and the fourth clutch 3
Only 3 is engaged and goes in reverse.

The traveling transmission 17 is constructed as follows.

That is, as shown in FIG. 2, a one-way clutch 41 is attached to the input shaft 13 so as to transmit the rotational force only in the input rotational direction of the input shaft 13 as an input shaft for a transmission to the first transmission gear 42. , the first transmission gear 42 , and the second output gear 25 , which is integrally rotatably attached to the output shaft 45 and meshed with the first transmission gear 42 , and which also serves as a first passive. A gear transmission mechanism 53, a second transmission gear 43 that is rotatably attached to the input shaft 13, and an output shaft 45 that is engaged with the second transmission gear 43.
a second passive gear 44 that is relatively rotatably attached to the
A second gear transmission mechanism 55 consisting of the second passive gear 44 and a first clutch 48 provided between the passive rotating body 54 of the output shaft 45, and a third transmission gear 46 integrally rotatably attached to the input shaft 13. and a third passive gear 47 that is relatively rotatably attached to the output shaft 45 while being engaged with the third transmission gear 46;
A third gear transmission mechanism 56 consisting of a passive gear 47 and a second clutch 49 provided between the passive rotating body 54 is provided between the input shaft 13 and the output shaft 45, and the first gear The transmission reduction ratio A of the transmission mechanism 53, the transmission reduction ratio B of the second gear transmission mechanism 55, and the transmission reduction ratio C of the third gear transmission mechanism 56 are adjusted so that the relationship is A>B>C. Gear transmission mechanisms 53, 55, and 56 are configured. The first clutch 48 is operated by a first hydraulic cylinder 50 and is configured to be engaged when the first hydraulic cylinder 50 is supplied with oil, and the second clutch 49 is configured to be engaged when the first hydraulic cylinder 50 is supplied with oil. 51 and is configured to be turned on when the second hydraulic cylinder 51 is supplied with oil. As shown in FIG. 1, the first hydraulic cylinder 50 and the second
The hydraulic cylinder 51 is configured to be operated by one sub-shift valve 52, and the first clutch 50 and the second clutch 51 are switched by switching the sub-shift valve 52 using the sub-shift operating tool 57. The speed can be changed by operation.

Specifically, the sub-shift operating tool 57 is moved to the first operating position.
When operated to _L1 or the second operating position _L2 , the sub-shift valve 52 moves to the first operating position _L1 or the second operating position.
l ₂ , the first clutch 50 and the second clutch 5
1 is turned off, the input shaft 13 and the output shaft 45 are interlocked by the first gear transmission mechanism 53,
The speed becomes low.

When the sub-shift operating tool 57 is operated to the third operating position M, the sub-shift valve 52 moves to the third operating position m, and only the first clutch 50 is engaged, thereby changing the transmission reduction ratio A of the first gear transmission mechanism 53. Second gear transmission mechanism 5
5, the rotational force of the input shaft 13 is transferred to the output shaft 45 by the second gear transmission mechanism 55.
Input shaft 13 and output shaft 45 are interlocked so that transmission is given priority to first gear transmission mechanism 53, and a medium speed state is established.

When the sub-shift operating tool 57 is operated to the fourth operating position H, the sub-shift valve 52 moves to the fourth operating position H, and only the second clutch 49 is engaged, thereby changing the transmission reduction ratio A of the first gear transmission mechanism 53. Third gear transmission mechanism 5
Due to the difference in the transmission reduction ratio C of 6, the rotational force of the input shaft 13 is transferred to the output shaft 45 by the third gear transmission mechanism 56.
The input shaft 13 and output shaft 45 are interlocked so that the signal is transmitted to the output shaft 45 with priority over the first gear transmission mechanism 53, resulting in a high-speed state.

As shown in FIG. 1, the first valve portion 38a
The first oil passage 58 connects the first oil passage 58 and the second valve part 38b so that the auxiliary transmission valve 52 is supplied with oil.
A second oil passage 59 connects the oil passage 58 and the auxiliary transmission valve 52, and a second oil passage 59 connects the second oil passage 59 to the drain oil passage 60 at the first operating position _l1 of the auxiliary transmission valve 52. A third oil passage 61 provided in
The switching operation mechanism 62 that acts on the auxiliary shift operating tool 57 is configured to be linked to the auxiliary shift operating tool 57 so as to be automatically switched between an activated state and an action-released state depending on the operating position of the auxiliary shift operating tool 57. The main shift operating tool 39 moves from the first operating position N to the second operating position.
When the sub-shift operating tool 57 is in the first operating position _L1 , the main transmission for traveling 18 is maintained in a neutral state, regardless of whether it is switched to any _of the operating positions F1 to the fifth operating position R.

That is, the sub-shift operation tool 57 is in the first operation position.
When operated to _L1 , the sub-shift valve 52 becomes the first operating position _L1 , the second oil passage 59 is connected to the drain oil passage 60 by the third oil passage 61, and the main transmission valve 38
No matter which of the second to fifth operating positions f ₁ , f ₂ , f ₃ , r, where is the transmission position, the second
The oil passage 59 and the third oil passage 61 are connected to the first valve portion 38a.
By discharging the oil supplied from Operate all clutches 30 to 33 as shown in the illustration.
Then, when the sub-shift operating tool 57 is operated to an operating position L ₂ , M, or H other than the first operating position L ₁ , the second
The connection between the oil passage 59 and the oil drain passage 60 is cut off, and it becomes possible to supply oil from the first valve part 38a to the hydraulic cylinders 34 to 37 for main transmission, and it is possible to engage the clutches 30 to 33 for main transmission. become.

The hydraulic cylinder 63 shown in FIG. 1 operates to disengage the pre-processing section clutch 15 against the restoring force, and the hydraulic adjustment device 64 controls the engagement operation of the four clutches 30 to 33. This is intended to slow down the speed.

[Another example]

The auxiliary transmission for traveling may be configured to be capable of switching between only two high and low speeds, or may be configured to be capable of switching between four or more speeds.

A releasable oil drain valve is provided in the oil passage connecting the first valve part 38a and the second valve part 38b or the oil passage connecting the second valve part 38b and each hydraulic cylinder 34 to 37, and a main shift operating tool is provided. The cut operation mechanism 62 may be replaced by a configuration in which a hydraulic, mechanical, electrical, or other type control mechanism is provided to automatically operate the oil drain valve based on the detection result of the position of the valve.

The main transmission for traveling may be constructed so that the clutch is operated to disengage by supplying oil to a hydraulic cylinder.

[Brief explanation of the drawing]

The drawings show an embodiment of the transmission device for driving a working vehicle according to the present invention, in which FIG. 1 is a hydraulic circuit diagram, FIG. 2 is a schematic diagram of the transmission device, and FIG. 3 is a side view of the front part of a combine harvester. 13... Input shaft, 17... Travel sub-transmission device,
18... Main transmission for traveling, 30, 31, 32,
33, 48, 49...Hydraulic operated clutch, 38
...Main transmission valve, 41...One-way clutch, 4
5...Output shaft, 52...Sub-shift valve, 53,5
5, 56...Transmission mechanism, 57...Sub-shift operation tool,
62... Cutting operation mechanism, L ₁ ... First lowest speed position,
L ₂ ...Second lowest speed position, M, H...Operation position.

Claims (1)

[Claims for Utility Model Registration] The main transmission for traveling 18 is configured to be switched by operating the main transmission valves 38 of a plurality of hydraulically operated clutches 30, 31, 32, 33, The transmission 17 includes a transmission mechanism 53 for the lowest speed among a plurality of transmission mechanisms 53, 55, and 56 that interlock the input shaft 13 and the output shaft 45, to which only rotational force in a specific rotational direction is transmitted. A direction clutch 41 is provided,
Moreover, hydraulically operated clutches 4 are provided in the transmission mechanisms 55 and 56 other than the transmission mechanism 53 for the lowest speed.
8 and 49 operated by an auxiliary shift valve 52, the auxiliary shift operating tool 57 has a first lowest speed position _L1 and a second lowest speed position. _L2 , and the releasable switching mechanism 62 that acts on all the hydraulically operated clutches 30, 31, 32, 33 for the main transmission is moved to the first lowest speed position _L1.
If the auxiliary shift operating tool 57 is located at any of the operating positions L ₂ , M, H other than the first lowest speed position L ₁ , the auxiliary shift operating tool 57 is automatically activated. A traveling transmission device for a working vehicle that is linked to the auxiliary gear shift operating tool 57 so as to automatically enter a deactivated state. Said hydraulically operated clutch 30, 3 for main transmission
1, 32, and 33 are clutches that are engaged when oil is supplied, and the switching operation mechanism 63 is a mechanism that brings the hydraulically operated clutch into an oil draining state. Device. The vehicle for traveling according to claim 1 or 2, wherein the auxiliary transmission device 17 for traveling is a device having a plurality of transmission mechanisms 55 and 56 other than the transmission mechanism 53 for lowest speed. Transmission device.