JPS6128514Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a power transmission device for a tractor.

Generally, a power transmission shaft protrudes from the transmission case and is connected to a transmission gear in the transmission case at one end and a clutch at the other end. It is stored and held in the case body so that it can rotate freely around its axis. The transmission gear in the transmission case is lubricated with lubricating oil such as transmission oil, and the lubricating oil is prevented from flowing toward the clutch between the power transmission shaft and the inner peripheral surface of the case body. A seal member is provided.
However, if the sealing member becomes damaged or old, a sufficient sealing effect may no longer be obtained, and there is a risk that a portion of the lubricating oil may leak inside the case toward the clutch. If the clutch is a dry friction clutch, if leaked lubricating oil adheres to the clutch disk etc., the clutch may slip, resulting in insufficient power transmission, and furthermore, there is a risk that the clutch may be damaged. . Therefore, when an oil leak occurs, the seal member must be replaced immediately, but since the seal member is built into the transmission case, replacement is difficult, and oil leaks from the seal member must be promptly replaced. It is also difficult to discover.

This idea was developed in consideration of these points, and even if oil leaks from the seal member, it can prevent the oil from adhering to the clutch disc, etc., and can also prevent oil leakage from the seal member at an early stage. The purpose is to obtain a power transmission device for a tractor that can be discovered.

This idea connects a cylindrical outer body to the mission case, and inside this outer body, one end is connected to the clutch and the other end is connected to the gear inside the mission case.The power transmission shaft is rotatable around the axis. A sealing member is provided between the outer mantle on the transmission case side and the power transmission shaft, and a hole is provided outside the sealing member to communicate between the inside and outside of the mantle. By doing so, even if some of the lubricating oil that lubricates the transmission gear etc. inside the transmission case leaks from the sealing member, the lubricating oil will be discharged from the hole to the outside of the mantle, and the leaked lubricating oil will be able to reach the clutch. This structure prevents the lubricating oil from reaching the lubricant and impairing the function of the clutch, and also allows oil leakage from the sealing member to be detected at an early stage by the lubricating oil discharged from the hole.

An embodiment of this invention will be described based on the drawings. A transmission case 3 is fixed to a clutch case 2 that houses a dual clutch 1 that is a clutch. Inside this mission case 3 is
A PTO input shaft 4 that transmits power to a PTO shaft (not shown), a traveling input shaft 5 that transmits power to a running wheel drive shaft (not shown), a gear shaft 6, etc. are held rotatably around their axes. An input gear 7, which is a gear, and a transmission gear 8, which is a plurality of selectively meshing gears, are fitted to each of these shafts either fixedly or slidably along the axial direction. Note that the traveling input shaft 5
is loosely fitted to the PTO input shaft 4. Coaxially with the gear shaft 6 is a running power transmission shaft 10 which is a power transmission shaft integrally formed with a transmission gear 9 that meshes with the input gear 7 of the running input shaft 5 at one end.
is provided rotatably around its axis, and this traveling transmission shaft 10 protrudes from inside the transmission case 3 into the clutch case 2, and has a disc body 11 constituting the dual clutch 1 at its tip. A holding hub 12 is connected. Further, on the outer periphery of the traveling transmission shaft 10, a PTO transmission shaft 1 which is a power transmission shaft is integrally formed with a transmission gear 13 that meshes with the input gear 7 of the PTO input shaft 5 at one end.
4 is loosely fitted, and a hub 16 that holds a disc body 15 constituting the dual clutch 1 is connected to the tip end of the PTO transmission shaft 14. And said
A retainer 17, which is a jacket covering the outer periphery of the PTO transmission shaft 14, is provided with one end connected to the transmission case 3. The retainer 17 and the
A seal ring 18, which is a sealing member, is provided between the PTO transmission shaft 14 and the PTO transmission shaft 1.
A seal ring 19, which is a sealing member, is also provided between the driving power transmission shaft 10 and the driving power transmission shaft 10. the retainer 17 outside the seal ring 18;
A hole 20 that communicates between the inside and outside of the retainer 17 is bored in the bottom part of the retainer 17, and the PTO transmission shaft 14 has a hole 20 located outside the seal ring 19 and within the same vertical plane as the hole 20. Let's PTO
A plurality of holes 21 are bored through which the inside and outside of the transmission shaft 14 communicate with each other. Although the PTO transmission shaft 14 acts as a power transmission shaft,
It also acts as a jacket for the traveling power transmission shaft 10.

The dual clutch 1 includes, in addition to the disk bodies 11 and 15 and the hubs 12 and 16 described above, a clutch disk 24 fixed to a flywheel 23 that is connected to a crankshaft 22 and rotates.
25 and clutch disks 24, 25 to clamp the disc bodies 11, 15, and the bottom of the clutch case 2 has inner and outer parts. A hole 27 is formed to communicate with each other.

In such a configuration, the dual clutch 1
When the clutch pedal (not shown) is depressed, the drive side is first disengaged, and when the clutch pedal is further depressed, the PTO side is disengaged. For power transmission on the traveling side, the traveling transmission shaft 10 rotates integrally with the disc body 11 held between the clutch disk 24 and the pressure plate 26, and the rotation of the traveling transmission shaft 10 is directly transmitted or This is done by being transmitted to the gear shaft 6 via the input shaft 5 and further transmitted to the running wheel drive shaft. In power transmission on the PTO side, the PTO transmission shaft 14 rotates integrally with the disc body 15 held between the clutch disk 25 and the pressure plate 26, this rotation is transmitted to the PTO input shaft 4, and then the PTO This is done by transmitting the signal to the shaft.

The input gear 7, transmission gear 8, etc. inside the transmission case 3 are lubricated with lubricating oil such as transmission oil, and a seal ring 1 is used to prevent this lubricating oil from leaking outside the transmission case 3.
8 and 19 are provided. If these seal rings 18 and 19 are damaged or aged, some of the lubricating oil inside the transmission case 3 will leak from the seal rings 18 and 19, causing damage to the retainer 17 and
Gap between PTO transmission shaft 14 and PTO transmission shaft 1
4 and the traveling power transmission shaft 10, and flows in the direction of the dual clutch 1. However, the lubricating oil leaking from the seal ring 18 is discharged from the hole 20 to the outside of the retainer 17, and the seal ring 19
The lubricating oil leaked from the hole 21 is discharged to the outside of the PTO transmission shaft 14 and further discharged to the outside of the retainer 17 from the hole 20. Therefore, the lubricating oil leaking from the seal rings 18, 19 is prevented from flowing to the dual clutch 1, and the dual clutch 1 is prevented from slipping due to the lubricating oil adhering to the clutch discs 24, 25 and disc bodies 11, 15. This can prevent damage to the dual clutch 1. Also, hole 2
Since the lubricating oil discharged from the clutch case is discharged to the outside from the hole 27 at the bottom of the clutch case, defects in the seal rings 18 and 19 should be discovered early and measures such as replacing the seal rings 18 and 19 should be taken. be able to. Further, if the amount of lubricating oil leaking is small, it may be used as is, and the seal rings 18 and 19 may be replaced when the airframe is repaired.

This idea is based on the fact that the outer body that houses and holds the power transmission shaft that protrudes from the inside of the transmission case and is connected to the clutch as described above has a part that is located outwardly from the sealing member provided between the power transmission shaft and the outer body. By drilling a hole located on the side that communicates the inside and outside of the mantle, the lubricating oil inside the mission case that leaked from the sealing member can be discharged from the hole to the outside of the mantle, preventing leakage. This prevents lubricating oil from flowing to the clutch through the gap between the mantle and the power transmission shaft, and prevents clutch slippage caused by lubricating oil leaking from the sealing member and adhering to the clutch. This has the advantage of being able to prevent the clutch from being damaged in advance, and to detect defects in the sealing member at an early stage due to the lubricating oil discharged from the hole.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention, and is a longitudinal sectional side view of a clutch case and a transmission case. 1...Dual clutch (clutch), 3...
Mission case, 7... Input gear (gear), 8
...Transmission gear (gear), 10...Transmission shaft for traveling (power transmission shaft), 14...PTO transmission shaft (power transmission shaft, mantle body), 17...Retainer (mantle body), 18
~19...Seal ring (sealing member), 20~
21...hole.

Claims (1)

[Scope of utility model registration request] A cylindrical outer body extending laterally is connected to a transmission case housing a plurality of gears, and a power transmission shaft is connected to the clutch at one end and connected to the gear at the other end within the outer shell. A sealing member is provided between the outer mantle on the mission case side and the power transmission shaft, and the seal member is positioned outwardly than the sealing member and attached to the mantle. A power transmission device for a tractor, characterized in that a hole is bored to communicate between the inside and outside of the mantle.