JPS6318256Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating device for a tractor, particularly a tractor in which a housing such as a transmission case is provided separately at the front and rear parts of the machine body.

Conventionally, in this type of tractor, there was no partition space between the hydraulic clutch and the rear transmission case, so it was necessary to fill the extra space with lubricating oil, and the PTO shaft was located approximately in the center of the case. In order to lubricate the bearing part of the PTO shaft, it was necessary to add lubricating oil to a high level, and a large amount of lubricating oil was required.

Therefore, in the present invention, a hollow chamber is formed between the housing housing the wet friction material clutch and the housing housing the gear transmission, which prevents the inflow of lubricating oil. The object of the present invention is to provide a lubricating device for a tractor, which is configured so that lubricating oil is forced to circulate between both housings through the hollow shaft, and which eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the tractor 1 has a body 3 supported by wheels 2.
consists of an engine 5, a front transmission case 6, an intermediate case 7 and a rear transmission case 9. As shown in FIG. 2, the engine 5 is connected to the front transmission case 6 via a main clutch (not shown).
A main shaft 10 to which power is transmitted is rotatably supported, and a traveling transmission shaft 11 and a PTO transmission shaft 12 are rotatably supported above and below the main shaft 10, respectively. Furthermore, a plurality of gears 13 with different numbers of teeth are fixed to the main shaft 10, and gears 15 that are constantly meshed with the gear 13 are respectively attached to the traveling speed change shaft 11 and the PTO speed change shaft 12.
..., 16... are rotatably supported. Selection clutches 17 and 19, which are operated by a main shift lever and a PTO shift lever, respectively, are supported on both shift shafts 11 and 12 so as to be able to slide only.
..., 16.... Furthermore, a gear 20 is fixed to the tip of the traveling speed change shaft 11,
The gear 20 is connected to a gear 22 via an idler gear 21 rotatably supported by the main shaft 10. On the other hand, the PTO gear shift shaft 12 extends through the intermediate case 7 and further extends through the joint 23.
It is connected to a PTO shaft 25, which extends through the rear transmission case 9 and projects from the rear of the case 6. Moreover, the gear 22 is
It is fixed to a hollow shaft 26 in which the PTO transmission shaft 12 is fitted, and the hollow shaft 26 is further connected to the intermediate case 7.
It is connected to a hydraulic clutch 27 consisting of a wet friction material clutch disposed at. Further, the output shaft of the hydraulic clutch 27 is also a hollow shaft 29 on which the PTO transmission shaft 12 is fitted, and the hollow shaft 29 passes through the intermediate case 7 and connects to the sub-transmission shaft 3 via a joint 30
1, and the sub-transmission shaft 31 is connected to the PTO
It consists of a hollow shaft into which the shaft 25 is fitted and extends to the rear transmission case 9. A plurality of gears 32 are fixed to the sub-transmission shaft 31 at the rear transmission case 9.
can selectively mesh with auxiliary transmission gears 34 that are slidably supported by a pinion shaft 33, and furthermore, the pinion shaft 33 is connected to the rear wheels via a differential device 35. Further, lubricating oil is sucked from the rear transmission case 9 by a pump 36 and communicates with the lubricating path of the hydraulic clutch 27 through a power steering device 37 or through a branch.

As shown in detail in FIG. 3, in the intermediate case 7, the hydraulic clutch 27 is partitioned by a partition wall 39, and therefore there is an empty space between the partition wall 39 and the front wall 9a of the rear transmission case 9. 40 is formed. Further, the space 40 is sealed with an oil seal 55 between the partition wall 39 and the front wall 9a, and further sealed with an O-ring 57 between the hollow shaft 29 and the joint 30. Therefore, lubricating oil is prevented from flowing into the cavity 40. Further, the partition wall 39 has a bearing 4.
1 is held, and the bearing 41 supports the hollow shaft 29. Further, a bearing 42 is held on the front wall 9a, and the bearing 42 supports the sub-transmission shaft 31, and a needle is inserted between the sub-transmission shaft 31 and the PTO shaft 25 at the bearing 42 portion. A bearing 43 is interposed to support the PTO shaft 25. Further, the hydraulic clutch 27 is connected to a hydraulic oil conduit 45 and a lubricating oil conduit 46. It communicates with the clutch desk 51 through a chamber 52, and further communicates with the gap S between the hollow shaft 29 and the PTO transmission shaft 12 through a chamber 52.

Since this embodiment has the above configuration, the rotation of the engine 5 is controlled by the main shaft 10 via the main clutch.
It is further transmitted to the traveling transmission shaft 11 after being appropriately changed by the main transmission gear 15 and the selection clutch 17, and further transmitted to the hydraulic clutch 27 via the gears 20, 21 and 22. Normally, the hydraulic clutch 27 is in a connected state, and the transmission is transmitted to the auxiliary transmission shaft 31 via the hollow shaft 29, and the auxiliary transmission gear 34 is
The speed is changed and transmitted to the pinion shaft 33, and the wheels 2 are further driven via the differential device 35, causing the tractor 1 to travel. On the other hand, the rotation of the main shaft 10 is controlled by the PTO
The speed is appropriately changed by the speed change gear 19 and the selection clutch 19 and transmitted to the PTO speed change shaft 12, and the PTO shaft 25 is further rotated and driven via the joint 30.
Then, in the case of live PTO, that is, when only the PTO shaft 25 is rotated regardless of the aircraft traveling, the hydraulic clutch 27 is disconnected to cut off rotation to the hollow shaft 29 and the aircraft travel is stopped.

On the other hand, as the engine 5 rotates, the pump 36 is also driven, and the lubricating oil sucked from the rear transmission case 9 drives the power steering device 37.
After passing through the lubricating oil conduit pipe 4 of the hydraulic clutch 27
6 is discharged. The lubricating oil from the conduit 46 is supplied to the clutch disk 51 through the hole 49 and the passage 50 as shown by the arrow in FIG. 3, and lubricates and cools the disk 51.
The clutch 27 is lubricated with an oil bath containing an appropriate amount of oil stored in a housing containing the clutch 27. Thereafter, the lubricating oil in the housing is supplied to the gap S between the hollow shaft 29 and the PTO transmission shaft 12 through the chamber 52. Then, the lubricating oil is applied to the gap S
It is guided between the auxiliary transmission shaft 31 and the PTO shaft 25 through the shaft, and after lubricating the needle bearing 43 and the bearing 42, it is returned to the rear transmission case 9.

As explained above, according to the present invention, since the cavity 40 that prevents the inflow of lubricating oil is formed between both housings, it is no longer necessary to fill in the lubricating oil by the amount of the cavity 40, and the lubricating oil is The amount can be significantly reduced. Also, connect both housings to the hollow shaft 29.
Since the lubricating oil is circulated between the two housings through the hollow shaft, the hollow shaft and the bearing parts 42, 43 such as the PTO shaft within the hollow shaft can be easily and reliably lubricated. Since the oil level can be lowered and a dedicated lubricating oil communication pipe is not required, the structure can be simplified. Furthermore, the wet friction material clutch 27 is always reliably lubricated by oil bath lubrication with lubricating oil stored in the housing, and the lubricating oil in the housing is replaced by forced circulation from the pump 36. Although the temperature of the lubricating oil is prevented from increasing, and the housing is housed in a relatively small size due to the existence of the empty chamber 40, the wet friction material clutch 27 can be properly lubricated at all times and can be used under severe conditions. It can also maintain its performance and extend its lifespan.

[Brief explanation of drawings]

FIG. 1 is a side view showing a tractor to which the present invention can be applied, FIG. 2 is a schematic side view showing its transmission device,
FIG. 3 is a sectional view showing the intermediate case portion. 1... Tractor, 3... Airframe, 6... Front transmission case (housing), 7... Intermediate case,
9...Rear transmission case (housing), 1
2...PTO transmission shaft, 27...Wet friction material clutch (hydraulic clutch), 29...Hollow shaft, 40...
Vacancy.

Claims (1)

[Claims for Utility Model Registration] A tractor comprising a lubricating oil pump, a wet friction material clutch, and a gear transmission, and in which power is transmitted to the clutch and gear transmission through a transmission shaft, wherein the clutch and the gear transmission are housed in a housing, respectively, and A hollow chamber is formed between both housings to prevent the inflow of lubricating oil, and the transmission shaft is formed of a hollow shaft, and the lubricating oil pump supplies the lubricating oil from the housing housing the gear transmission to the wet friction. A lubricating system for a tractor, wherein material is supplied to a clutch and circulated from a housing containing the clutch to the gear transmission through the hollow shaft.