JPH0781617B2 - Vehicle mission mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mission mechanism of a vehicle such as a tractor, and proposes a mission mechanism arranged so as to reduce an occupied space. .

[Prior Art] In recent years, vehicles such as tractors are often used for, for example, loader work in which forward work and reverse work are frequently repeated. For this reason, a vehicle equipped with a forward / reverse switching mechanism has appeared in the mission case. There is.

Further, the tractor must be provided with a transmission mechanism such as a PTO system clutch and a transmission because it is necessary to drive not only the loader work but also various working machines such as a rotary. However, if the forward / reverse switching mechanism and the transmission mechanism described above are provided in the mission case without any modification, the forward / backward length of the mission mechanism itself becomes long and the cross section tends to become large.

[Problems to be Solved by the Invention] The present invention has devised the arrangement of gears and transmission mechanisms so that the length of the mission case is shortened and the cross section is also reduced.

[Means for Solving the Problems] The present invention has taken the following means in order to solve the above problems.

That is, the power from the engine is input to the traveling system by inputting the power from the front into the transmission case 1 via the clutch 2 provided on the front side of the transmission case 1, and the power from the engine is not passed through the clutch 2. In the transmission case 1, the input from the front is transmitted to the PTO system, and the forward / reverse switching mechanism 13 and the traveling system transmission mechanism 17 are arranged in this order in the transmission path of the traveling system in the mission case 1. In vehicles installed in series, in the mission case 1
A PTO system transmission mechanism 32 and a PTO system transmission mechanism 50 are provided in the PTO system transmission path, and the PTO system transmission mechanism 32 is connected to the shaft of the forward / reverse switching mechanism 13 on the front side of the transmission case 1. The transmission mechanism 32 is provided in parallel shafts, and the transmission mechanism 32 is provided in a positional relationship of overlapping with the forward / reverse switching mechanism 13 in the front-rear direction.

[Embodiment and Action] Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a longitudinal side elevational view of a main part of the mission case, FIG. 2 shows a front view of the gear diagram thereof, and FIG. 3 shows a power transmission diagram thereof. The engine on the left side of FIG. Is transmitted to the drive shaft 3 which is the clutch output shaft of the upper main clutch 2 in the mission case 1, and the counter shaft 4 positioned below the drive shaft 3 and parallel to the drive shaft 3 is in the mission case. 1 and the drive gear 5 of the drive shaft 3 is supported by the counter shaft 4
Of the front and rear counter gears 6 and 7 provided on the transmission gear shaft 8, and the transmission shaft 8 positioned in parallel with the counter shaft 4 is pivotally supported by the transmission case 1.
, A reverse gear 10 fixedly mounted on the reverse idle shaft 9 in parallel with the reverse idle shaft 9 meshes with a counter gear 7 at a rear position, and the speed change gears 11 are allowed to idle on the speed change shaft 8, respectively. One of the transmission gears 12 is the counter gear 6 of the front
In addition, by engaging the other transmission gear 12 with the reverse gear 10 respectively and operating the forward / reverse switching mechanism 13 which is a meshing switching mechanism provided between the transmission gears 11 and 12,
It is provided that 11 or 12 is selectively fixed to the transmission shaft 8.

The rotation of the transmission shaft 8 is performed by rotating the counter gear group 15 of the main transmission counter shaft 14 fixedly mounted on the transmission shaft 8 and the transmission gear group meshing with the counter gear group 15.
The main transmission mechanism 17 consists of 16 and
The rotation of 18 is further decelerated by the sub transmission mechanism 19 or the ultra-low speed reduction mechanism 20 to drive the rear wheel differential mechanism 22 and the left and right rear wheels 23, 23 via the drive pinion shaft 21.

Therefore, if the forward / reverse switching mechanism 13 is appropriately switched, the machine body moves forward or backward.

Then, the first shaft 24 (which is formed as a hollow shaft in the illustrated example) having a conduction system different from that of the counter shaft 4 and the speed change shaft 8 described above.
Is rotatably supported on the mission case 1, and a second shaft 25 is rotatably supported on the first shaft 24 concentrically with the first shaft 24, and a flywheel shaft 26 serving as an input shaft of the main clutch 2 is provided. The gear 28 provided on the driving shaft 27 integrated with the gear meshes with the gear 30 fixed on the second counter shaft 29, and the gear 31 provided on the first shaft 24 is connected to the gear 30.
A transmission mechanism 32 that meshes with the first shaft 24 and transmits the rotation of the first shaft 24 to the second shaft 25 is provided so that a part of the transmission mechanism 32 can be seen between the front and rear counter gears 6 and 7.

The transmission mechanism 32 of the illustrated example has a first shaft 24 and a second shaft 25, respectively.
The engaged friction plates 33, 33 ... And 34, 34 ... Are brought into contact with each other by the pushing operation of the clutch piston 35 by the hydraulic pressure, and the first shaft 24 and the second shaft 25 are integrated so that the pressure oil is When not supplied to the clutch piston 35, the spring 36 causes the friction plate to
33 and 34 show a PTO clutch in which the second shaft 25 is separated from the first shaft 24 by separating them from each other.
The PTO drive shaft 37 is connected to the shaft 25. The transmission mechanism 32 may be a transmission mechanism instead of a clutch.

In the above configuration, if the transmission gear 11 is fixed to the transmission shaft 8 by operating the forward / reverse switching mechanism 13, the drive shaft 3 moves the transmission shaft 8 in the forward direction by the engagement of the drive gear 5, the counter gear 6, and the transmission gear 11. When the transmission gear 12 is fixed to the transmission shaft 8, the drive shaft 3 drives the transmission shaft 8 in the reverse direction by meshing the drive gear 5, the counter gear 7, the reverse gear 10, and the transmission gear 12. I will let you. Further, the forward / reverse switching mechanism 13 provided on the speed change shaft 8 and the transmission mechanism 32 constituting the PTO clutch mechanism are arranged side by side immediately after the main clutch 2.

Therefore, the power of the traveling system is turned on / off by the main clutch 2, the power of the PTO system is turned on / off by the independent PTO clutch, and the main clutch 2 and the PTO clutch are provided close to each other. 13 is also provided in the vicinity.

Thus, the maintenance work can be performed intensively, and the space in the mission case 1 can be effectively used. Therefore, the overall length of the mission case 1 can be shortened and the entire mission case 1 can be made compact. It becomes possible to configure.

[Effect of the Invention] The mission mechanism of the vehicle according to the present invention is configured as described above, and the PTO in the mission case 1 is
In the transmission path of the system, the PTO system transmission mechanism 32 and the PTO system transmission mechanism 50
And the PTO transmission mechanism 32 is provided on the front side of the mission case 1 on a shaft parallel to the axis of the forward / reverse switching mechanism 13, and the transmission mechanism 32 is provided on the forward / reverse switching mechanism 13. On the other hand, since they are provided in a positional relationship of overlapping in the front-rear direction, the space required for the transmission mechanism 32 can be small, and the length of the mission mechanism can be shortened, and at the same time, the mission mechanism can be shortened. It is also possible to reduce the cross section of.

In addition, since the forward / reverse switching mechanism 13 that is frequently used in loader work and the PTO system transmission mechanism 32 that is often used in rotary work are provided close to the front side in the mission case, these are frequently used. It is easy to deal with the failure of one of the mechanisms, and the other mechanism can be inspected at the same time when the parts are replaced, which facilitates maintenance such as inspection.

[Brief Description of Drawings] Each drawing will be briefly described below. FIG. 1 is a side elevational view of a longitudinal section of a main part of a mission case. FIG. 2 is a gear diagram in the cross section of FIG. 1. FIG. 3 is a power transmission diagram. The main symbols will be briefly described below. 1: Mission case 2: Main clutch 13: Forward / reverse switching mechanism 17: Travel system transmission mechanism 32: PTO system transmission mechanism 50: PTO system transmission mechanism

Continuation of front page (56) Reference JP-A-57-104411 (JP, A) JP-A-57-87719 (JP, A) Actual opening Sho-53-147381 (JP, U) Actual opening Sho-58-92133 (JP , U)

Claims (1)

[Claims] 1. A motive power from an engine is input to the traveling system by inputting the motive power from a front part of the transmission into a transmission case through a clutch provided on a front side of the transmission case, and the motive power from the engine is bypassed through the clutch. A vehicle in which a transmission is input to the PTO system from the front of the mission case and a forward / reverse switching mechanism and a traveling system transmission mechanism are provided in series in this order in the transmission path of the traveling system in the mission case. In, in the transmission path of the PTO system in the mission case, a PTO system transmission mechanism and a PTO system speed change mechanism are provided.
Further, the PTO system transmission mechanism is provided on the front side of the mission case on a shaft that is parallel to the axis of the forward / reverse switching mechanism, and the transmission mechanism has a positional relationship that overlaps the forward / reverse switching mechanism in the front-rear direction. A vehicle mission mechanism characterized by being provided.