JPH0142669Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cooling system for an engine main clutch in a vehicle such as a tractor.
Cooling oil can be supplied from the center of the clutch shaft by utilizing the space between the PTO propulsion shaft and the traveling propulsion shaft.

In vehicles such as tractors, a dual-shaft PTO propulsion shaft and a travel propulsion shaft are mounted between the engine and the transmission, and the power from the engine is
There is one in which power is transmitted from each propulsion shaft to the transmission via a PTO clutch and a travel clutch. However, in this type of vehicle, if the clutch is frequently used in a partially engaged state, the clutch will generate heat and seize, so a wet clutch is used and an oil-cooled system is used in which the clutch is cooled with cooling oil. However, in the past, it was common practice to immerse the entire clutch in cooling oil or to spray cooling oil from the outside of the clutch, making it difficult to sufficiently cool down to the inner lining.

Therefore, as disclosed in Japanese Utility Model Application Publication No. 54-90549, a helical groove is formed between the propulsion shafts of a double shaft structure, and the lubricating oil discharged from the pump is supplied to this helical groove. There is a technique for cooling the clutch lining by discharging lubricating oil from the helical groove radially outward from the clutch shaft center.

However, in the conventional technology described above, although the pump that sends liquid to the helical groove is driven by an engine, its function is only a pump function, and since it is mounted on the exterior, the piping members are also long. It needed to be flexible, which made the structure complex and difficult to implement.

The present invention solves these conventional problems by providing a PTO propulsion shaft and a traveling propulsion shaft with a dual shaft structure between the engine and the transmission. A main clutch is provided at the end of the shaft on the engine side, and an inner hole is provided between both propulsion shafts for sending the cooling oil sent from the pump to the main clutch side and discharging it radially outward from the clutch shaft center. The outer propulsion shaft is supported on the bulkhead of the transmission via a bearing, and the bulkhead has a
In a vehicle equipped with a propulsion shaft case having a clutch release means, an oil pump case is attached to the rear of the propulsion shaft case and the pump is driven by the outer propulsion shaft, and the pump case connects the outer propulsion shaft to the bearing. The present invention is characterized in that the pump case is supported even to the front side, and furthermore, a holding portion for the bearing is formed on the pump case, and the pump case is attached to the partition wall.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. In FIG. 1, 1 is a crankshaft of an engine, which has a flywheel 2, and the flywheel 2 is inside a flywheel housing 3 attached to a crankcase. is housed in. 4 is a clutch housing, 5 is a transmission case, and a partition wall 6 is provided between them. 7
is a transmission built into the transmission case 5, which is configured to transmit power to the PTO shaft and drive wheels, respectively.The transmission 7 passes through the bulkhead 6 and transmits the PTO to the front side.
A propulsion shaft 8 and a traveling propulsion shaft 9 are provided protrudingly.
The PTO propulsion shaft 8 and the travel propulsion shaft 9 have a dual-shaft structure, and are fitted with a predetermined distance so that they can rotate freely relative to each other. It is pivotally supported by the partition wall 6. 11 is PTO clutch 12 and travel clutch 1
3 are arranged in parallel in the axial direction, and each clutch 12, 13 has clutch discs 14, 15, pressing plates 16, 17, pressing springs 18, 19, etc. assembled in a clutch body 20. The clutch body 20 is attached to the flywheel 2. Each clutch 12,
Thirteen clutch disks 14, 15 are connected to bosses 21, 22 fitted to the front ends of the propulsion shafts 8, 9. Reference numeral 23 denotes a propulsion shaft case, which is attached to the partition wall 6 via an oil pump 24 to be described later, and this propulsion shaft case 23 is loosely fitted onto the traveling propulsion shaft 9. On the propulsion shaft case 23 there are release hubs 2 for the PTO clutch 12 and the travel clutch 13.
The release hub 25 is connected to the PTO clutch 12 via a release bearing 27, a release ring 28, a release lever 29, etc., and the release hub 26 is connected to a release bearing 30 and a release lever 29. They are respectively linked to the travel clutch 13 via levers 31 and the like. Furthermore, each release hub 25, 26 is interlocked and connected to a PTO clutch lever (not shown), a travel clutch pedal, etc. (not shown) via forks 32, 33 and fork shafts 34, 35, and when these are operated, each clutch 12, 13 is activated. Configured to be cut.

As shown in FIG. 2, the oil pump 24 includes a drive gear 36 fixed to the propulsion shaft 9, and a driven gear 3 meshed with the drive gear 36 and supported by a driven shaft 37.
8, and a flange 3 surrounding these gears 36 and 38.
9, a housing 40, a cover 41, etc., and the oil pump 24 is attached to the partition wall 6 by fastening together with the attachment portion 42 of the propulsion shaft case 23.

That is, at the rear of the propulsion shaft case 23, there are pump cases 39, 40, 4, which are made up of a flange 39, a housing 40, a cover 41, etc. of the oil pump 24.
1 is installed, and the pump 24 is driven by an outer propulsion shaft, in the embodiment, a traveling propulsion shaft 19.
is supported even to the front side of the bearing 10, that is, the ball bearing 10, and furthermore, the pump case 39, 40, 41 is formed with a holding part of the bearing 10, a flange 39 in the embodiment, and is attached to the partition wall 6. There is. Reference numeral 43 denotes a suction pipe, which is screwed onto the mounting portion 42 from below so as to communicate with the suction port 44 of the oil pump 24. It is placed in oil 46 in pan 45. The discharge port 47 of the oil pump 24 is located in the inner hole 4 of the propulsion shaft case.
8. The front end side of the propulsion shaft case inner hole 48 is closed by a sealing material 49 fitted to the inner periphery of the front end of the propulsion shaft case 23 and slidingly in contact with the outer periphery of the traveling propulsion shaft 9, and the rear end side is closed by the cover 41 of the oil pump 24. has been done. A required number of oil holes 51 are formed in the travel propulsion shaft 9 in the radial direction to communicate the propulsion shaft case inner hole 48 and the travel propulsion shaft inner hole 50 , and the rear part of the travel propulsion shaft inner hole 50 is connected to the ball bearing 10 . The front end is closed between the bosses 21 and 22 of the shaft center of the wet clutch 11, and the front end is closed by a sealing material 52 that is fitted onto the inner periphery of the propulsion shaft 9 and slidably contacts the outer periphery of the PTO propulsion shaft 8. has been done.

In the above configuration, normally the PTO clutch 12
and the traveling clutch 13 are in the connected state, and the rotational power of the engine crankshaft 1 is transferred from the flywheel 2 to the PTO clutch 12, the traveling clutch 13,
It is transmitted to the transmission 7 via the PTO propulsion shaft 8 and the traveling propulsion shaft 9. When the travel propulsion shaft 9 rotates, the oil pump 24 is driven to suck oil 46 from the oil pan 45 through the suction pipe 43 and discharge it from the discharge port 47. This oil 46 flows from the inner hole 48 of the propulsion shaft case to the oil hole 5.
1 to the propulsion shaft inner hole 50, and is discharged radially from the front end opening of the propulsion shaft inner hole 50 as shown by the dotted arrows in FIG. Traveling clutch 1
The linings of the three clutch disks 14, 15 can be supplied with oil from the inside, and therefore each clutch 12, 13 can be reliably cooled and prevented from seizing.

Using the travel clutch 13 in a half-clutch state,
The oil pump 24 is also used when carrying out soil removal work etc.
Since the drive clutch 13 is driven, it is possible to cool the drive clutch 13.

When the transmission 7 is changed by disengaging the traveling clutch 13, the oil pump 24 serves as a load and the penetrating rotation of the traveling propulsion shaft 9 can be stopped, making gear changes easy.

Pump cases 39, 40 of oil pump 24,
41 supports the traveling propulsion shaft 9, which is supported by the bearing 10 on the partition wall 6, even to the front side of the bearing 10, so that even though the pump 24 is driven by the traveling propulsion shaft 9, the propulsion shaft 9 Since the support length of the propulsion shaft 9 is increased, axial vibration, deflection, etc. of the propulsion shaft 9 can be reduced.

Moreover, since the pump cases 39, 40, 41 are provided at the rear of the propulsion shaft case 23 and attached to the bulkhead 6, installation is easy.
0.41, the number of parts is small and the structure can be simplified.

The drive type, mounting structure, etc. of the oil pump 24 are not limited to those in the embodiment, and an oil passage 54 is formed at the center of the PTO propulsion shaft 8 as shown by the imaginary line in FIG. Oil from the propulsion shaft inner hole 50 may be supplied to the front side of the PTO clutch 12 through an oil passage 54 and an opening 55.
Furthermore, the PTO propulsion shaft 8 and the traveling propulsion shaft 9 may be configured with the inside and outside reversed. wet clutch 1
1 is linked to the two-step depression operation of the clutch pedal, and when the first step is depressed, the traveling clutch 13
The same effect can be obtained even if the PTO clutches 12 are respectively disengaged when the second stage is depressed.

As described in detail in the embodiments above, in the present invention, the oil discharged from the oil pump is sent from the oil hole formed in the outer propulsion shaft to the inner hole of the outer propulsion shaft, and the oil is transferred between the propulsion shafts of the dual inner and outer shaft structure. Since lubricant is supplied to the wet clutch from the opening in the clutch shaft core, the wet clutch can be cooled more reliably and seizures can be prevented compared to systems that supply oil from outside. In addition, the oil pump case is attached to the rear of the propulsion shaft case so that the pump is driven by the outer propulsion shaft, so when the clutch is disengaged and the transmission of the transmission is performed by the outer propulsion shaft, the transmission of the transmission is changed. , the oil pump acts as a load and can stop the inertial rotation of the outer peripheral propulsion shaft, making gear changes easier.

Furthermore, the outer propulsion shaft is supported on the bulkhead by a bearing, but the pump case supports the outer propulsion shaft even forward of the bearing, so the support length of the outer propulsion shaft becomes long. , it is possible to prevent the occurrence of shaft vibration, deflection, etc. of the outer peripheral propulsion shaft.

In addition, since the pump case installed at the rear of the propulsion shaft case is attached to the bulkhead, there is no need for flexible piping members, and the pump case has a holding part that holds down the bearing on the bulkhead. Therefore, the number of parts can be reduced and the structure can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing an embodiment of the present invention;
FIG. 2 is a sectional front view of the oil pump section. 1... Crankshaft, 7... Transmission, 8... PTO propulsion shaft, 9... Travel propulsion shaft, 1
1... Wet clutch, 12... PTO clutch,
13... Traveling clutch, 23... Propulsion shaft case,
24...Oil pump, 43...Suction pipe, 48...
...Inner hole of the propulsion shaft case, 50...Inner hole of the traveling propulsion shaft,
51...Oil hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A PTO propulsion shaft and a travel propulsion shaft with a dual shaft structure are provided between the engine and the transmission, and a main clutch is provided at the engine side end of these propulsion shafts. An inner hole is provided between the shafts for sending the cooling oil sent from the pump to the main clutch side and for discharging it radially outward from the clutch shaft center. In a vehicle in which a propulsion shaft case is mounted on the bulkhead and has a clutch release means, an oil pump case is attached to the rear of the propulsion shaft case and the pump is driven by the outer propulsion shaft, and the pump case is mounted on the bulkhead. The cooling of the engine main clutch is characterized in that the outer peripheral propulsion shaft is supported even to the front side of the bearing, and the pump case is further formed with a holding part for the bearing, and the pump case is attached to the bulkhead. Device.