JPH053374Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention connects the hydraulic continuously variable transmission for traveling and the transmission through a partition wall, thereby connecting the continuously variable hydraulic continuously variable transmission for traveling to the gear transmission. A transmission for traveling of a working vehicle, which is installed inside a case, and a charge pump of the continuously variable hydraulic transmission for traveling is installed inside a partition wall, and the internal lubricating oil of the gear transmission case is sucked through an oil filter. Regarding equipment.

[Conventional technology]

In the above working vehicle, conventionally, as shown in FIG. 6, the oil filter 18 is located outside the gear transmission case 9 on the vehicle body so that the oil filter 18 can be easily attached and detached when inspecting or replacing the oil filter 18. It was attached to part 27, and had the following disadvantages.

[Problem that the invention attempts to solve]

That is, the oil passages connecting the oil filter 18 to the gear transmission case 9 and the charge pump 15 must be formed with pipes 28 or 29 exposed outside the gear transmission case 9, and dirt and sand thrown up during driving must be formed. There is a risk that the oil passages may be easily damaged due to a collision between the pipes 28 and 29, and additional effort is required to assemble the pipes 28 and 29 when assembling the vehicle body.

An object of the present invention is to provide an oil filter that can be easily attached and detached, is extremely unlikely to be damaged in the oil passage, and does not require special effort in assembling the oil passage.

[Means for solving problems]

The characteristic structure of the present invention is that, in the traveling transmission system for a working vehicle described at the beginning, an oil filter is attached to the gear transmission case near the partition wall and positioned outside the case, and a charge pump is mounted on the partition wall. a third oil passage that communicates with the inside of the gear transmission case of the suction part of the oil filter; and a third oil passage that communicates the discharge part of the oil filter with the first oil passage. The second oil passage is bored in the gear transmission case, and its functions and effects are as follows.

[Effect]

By mounting the oil filter on the gear transmission case so as to be directly attached to its outer surface, the conventional external piping can be omitted and the fear of damage to the piping can be eliminated, and the labor for assembling it can also be omitted. I can do it. When directly attached to the transmission case, the oil filter was installed near the partition wall, so while the third oil passage that communicates with the inside of the gear transmission case was shortened, it did not need to be drilled into the partition wall. The second oil passage that communicates the first oil passage with the oil filter can be configured to be short.

In other words, all the oil supply and drainage passages for the oil filter can be formed inside the transmission case wall, making it difficult for these oil passages to be damaged due to collisions with earth and sand, etc.
Moreover, the length of the oil passage can be made as short as possible, thereby reducing the resistance to passage of oil and reducing the time and cost of drilling the oil passage.

[Effect of idea]

As a result, it was possible to realize a transmission device in which failures due to oil passage damage to the oil filter are less likely to occur, in a state that can contribute to improvement in assembly efficiency of the oil passage and improvement in lubrication efficiency.

〔Example〕

As shown in FIG. 5, a lift arm 3 that connects various work devices such as a rotary tiller so that it can be raised and lowered is attached to the rear of a traveling machine that is equipped with driveable front wheels 1 and rear wheels 2, and a lift arm 3 that connects various work devices such as a rotary tiller so that it can be moved up and down. An agricultural tractor is constructed by attaching a power take-off shaft 4 that transmits power to the device.

To enable power transmission to the front and rear wheels 1, 2 and the power take-off shaft 4, the output of the engine 5 is transmitted through a clutch 6, a rotary shaft 7, and an input shaft 8 to a gear mechanism, as shown in FIGS. 1 and 5. transmission case 9, and transmits the rotational force of the input shaft 8 to a gear transmission 10 for a power take-off shaft installed inside the rear end side of the gear transmission case 9. The transmission is transmitted to a hydraulic continuously variable transmission device 13 for driving, which is composed of a hydraulic pump 11 and a hydraulic motor 12, which are installed inside the front end side of the
The rotational output of the continuously variable transmission 13 is transmitted via the rotating shaft 14 to a traveling gear transmission (not shown) installed inside the rear end of the gear transmission case 9.
and a rear wheel differential mechanism (not shown).

The gear transmission case 9 includes a first transmission case portion 9A forming a storage chamber A for the continuously variable transmission 13, a second transmission case portion 9b forming a storage chamber B for the gear transmission 10, It is composed of a third transmission case portion 9c that forms a storage chamber C for the rear wheel differential mechanism, and a partition wall 9d that partitions the two storage chambers A and B.

As shown in FIG. 1, a trochoid-type charge pump 1 is installed in a built-in recess provided in the partition wall 9d.
At the same time, the drive shaft 15a of the charge pump 15 is interlocked with the gear 17 constituting the gear transmission 10 via the gear 16. As shown in FIGS. 2 and 3, the oil filter 18 is positioned outside the gear transmission case 9, and the suction portion 18a is bored into the second transmission case portion 9b. The third oil passage 19 connected to the lower part of the storage chamber B is screwed onto the filter attachment part 20 of the second transmission case part 9b, and the discharge part 18b of the oil filter 18 is screwed onto the filter attachment part 20 of the second transmission case part 9b.
is connected to the suction part 15b of the charge pump 15 through a second oil passage 21 bored in the second transmission case portion 9b and a first oil passage 22 bored in the partition wall 9d, and is connected to the discharge part 15b of the charge pump 15. The portion 15c is connected to a pair of oil passages 24a and 24b formed in the partition wall 9d through an oil passage 23 bored in the partition wall 9d to connect the hydraulic pump 11 and the hydraulic motor 12. , charge pump 15 is gear transmission 1
The lubricating oil contained in the storage chambers B and C of the gear transmission case 9 is sucked through an oil filter 18 and supplied to the continuously variable transmission 13 as hydraulic oil. It has been done.

25 shown in FIG. 1 is a transmission shaft to the front wheel 1, 26 shown in FIG. 4 is a neutral valve, and when the continuously variable transmission 13 is operated to a neutral state, the pair of oil passages 24a , 24b are automatically switched to a state where the hydraulic motors 1 and 24b are in communication with each other.
This ensures that the second drive is stopped.

[Another example]

The present invention can also be applied to various work vehicles other than agricultural tractors, such as transport vehicles.

[Brief explanation of the drawing]

The drawings show an embodiment of the traveling transmission device for a working vehicle according to the present invention, and FIG. 1 is a sectional view of the traveling transmission device, FIG. 2 is a sectional view of the oil passage, and FIG. 3 is a sectional view of the filter installation part. FIG. 4 is a partially cutaway plan view, FIG. 4 is a hydraulic circuit diagram of the continuously variable transmission, and FIG. 5 is a side view of the entire agricultural tractor. FIG. 6 is a plan view of a conventional filter arrangement section. 9...Gear transmission case, 9d...Partition wall, 13...Hydraulic continuously variable transmission for traveling, 15...
...Charge pump, 15b...Pump suction part, 1
8...Oil filter, 18a...Filter suction part, 18b...Filter discharge part, 19,2
1,22...Oil road.

Claims (1)

[Scope of utility model registration request] Traveling hydraulic continuously variable transmission 13 and transmission 10
By connecting through the partition wall 9d,
The traveling hydraulic continuously variable transmission device 13 is installed inside the gear transmission case 9, and the charge pump 15 of the traveling hydraulic continuously variable transmission device 13 is installed in the partition wall 9.
A traveling transmission device for a working vehicle configured to suck internal lubricating oil of the gear transmission case 9 through an oil filter 18, the oil filter 18 being installed near the partition wall 9d. Said gear transmission case 9
The charge pump 15 is attached to the partition wall 9d and is attached to the partition wall 9d.
a third oil passage 19 which connects the suction part 18a of the oil filter 18 to the inside of the gear transmission case 9; and a discharge part of the oil filter 18. 1
8b and the first oil passage 22 are connected to each other.
1 is bored in the gear transmission case 9, and is a traveling transmission device for a working vehicle.