JPH0367885B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a tractor transmission device.

(Prior Art) A drive system propulsion shaft that is linked to an engine via a clutch is provided with a forward rotation hydraulic clutch mechanism and a reverse rotation hydraulic clutch mechanism on both sides of the propulsion shaft, and each output side of the clutch mechanism A tractor transmission system in which the transmission gear of the traveling system is interlocked with the transmission shaft of the traveling system is disclosed in Japanese Patent Application Laid-Open No. 1987-
This was proposed in Publication No. 6136 and Japanese Utility Model Application Publication No. 59-4846.

(Problems to be Solved by the Invention) Although the prior art described in the above-mentioned publications is useful in its own way, since the PTO system and the running system are transmitted through the same subline through one shaft, the running system and the running system are
It could not be independent from the PTO system, and was therefore disadvantageous in pasture work, etc.

In the present invention, the clutch is semi-dual, the propulsion shaft system is separated into the running system and the PTO system, the PTO system propulsion shaft is directly connected to the engine, making its transmission shaft system inoperable, and a hydraulic clutch mechanism is installed on the PTO transmission shaft system. It is an object of the present invention to provide a tractor transmission device in which a traveling system and a PTO system can be made independent by fitting the shaft so that it can rotate freely.

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned object are characterized by the fact that the propulsion shaft 3 of the traveling system linked to the engine 1 via the clutch 8 is Hydraulic clutch mechanism 1 for normal rotation on both sides of shaft 3
0 and a reversing hydraulic clutch mechanism 11 are provided in a freely interlocking manner, and the hydraulic clutch mechanism 10,
11, each output side of which can be freely interlocked with the traveling system transmission shaft 27, a PTO system propulsion shaft 41 directly connected to the engine 1 is fitted onto the traveling system propulsion shaft 3, and a clutch 49 is inserted in the middle. have
A gear transmission mechanism 53 is provided that allows the PTO transmission shaft system 48 and the PTO system propulsion shaft 41 to freely interlock,
Either the forward rotation hydraulic clutch mechanism 10 or the reverse rotation hydraulic clutch mechanism 11 is fitted and supported on the PTO transmission shaft system 48 so as to be relatively rotatable.

(Operation) The rotational power of the engine 1 is transmitted to the traveling system propulsion shaft 3 through the engagement and disengagement of the clutch 8, thereby rotating the input sides of the forward rotation hydraulic clutch mechanism 10 and the reverse rotation hydraulic clutch mechanism 11.

Therefore, when either one of the clutch elements 24 or 24' in the clutch mechanisms 10, 11 is connected, the traveling system transmission shaft 27 is rotated in the normal or reverse direction.

On the other hand, in the case of a PTO system, since its propulsion shaft 41 is directly connected to the engine 1, the gear transmission mechanism 5
3, the PTO shaft system 48 is independently rotated,
The shaft system 48 is connected and disconnected via a clutch 49 provided in the middle thereof.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 to 3 show the entire transmission device of a tractor divided into a front half, middle, and rear half, respectively.

First, in FIG. 1, 1 is an engine crankshaft serving as an engine, and a flywheel 2 is attached to it.

3 is a running system propulsion shaft, the front end of which is supported by the crankshaft 1 via a bearing 4, the rear end of which is supported by the rear wall 6 of the flywheel housing 5 via a bearing 7, and the clutch 8 is connected to the engine. are interlocked and connected via.

The flywheel housing 5 has an open front end, a front flange 5A attached to the engine crankcase with bolts (not shown), and surrounds the flywheel 2 and clutch 8, and the rear wall 6 is opened through a stepped portion 5B. It is reduced in size and inserted into the front end opening of the first transmission case 9 in the front-rear direction, and is connected to the front end by bolts or the like (not shown).

10 is a hydraulic clutch mechanism for forward rotation, and 11 is a hydraulic clutch mechanism for reverse rotation.Since both mechanisms have the same configuration, one is shown as a representative.
The other one is illustrated with reference numerals added to the common parts.

That is, 12 is a clutch shaft, which is supported by a pair of front and rear bearings 13 and 14, and a clutch body 15 is fitted onto the clutch shaft 12.

However, in this example, the clutch body 15 on the reverse rotation side is rotatable together with the clutch shaft 12 by a spline 16, etc., but the clutch body 15' on the forward rotation side is
is supported via a needle bearing 17 so as to be relatively rotatable.

The clutch body 15 has an input gear 18 and a drive gear 1 attached to the rear end of the traveling system propulsion shaft 3.
9, and in this case, the gear ratio is the same for both forward and reverse rotations.

Reference numeral 20 denotes an output member, which is fitted and supported on the clutch shaft 12 via a needle bearing 21. The output member 20 has a clutch plate support portion 20A and a gear portion 20B.
0A is inserted into the clutch body 15 and actuates the piston 23 against the return spring 22, so that the clutch element 24 can be freely connected and disconnected.

Therefore, as is clear here, a forward rotation hydraulic clutch mechanism 10 and a reverse rotation hydraulic clutch mechanism 11 are built into the front half of the first transmission case 9 on both sides of the traveling system propulsion shaft 3, in this example, on the upper and lower sides. There is.

Reference numeral 25 denotes a main transmission mechanism of the traveling system, which is illustrated as a constant engagement type four-speed transmission gear structure in this example, and includes a transmission shaft 27 having a modified transmission gear group 26, a transmission subshaft 29 having a transmission gear group 28, Consisting of
A speed change shaft 27 is supported substantially on an extension of the axis of the propulsion shaft 3 of the propulsion system, and an interlocking gear 30 is fixed to the front end of the speed change shaft 27, and a forward rotation hydraulic clutch mechanism 10 is attached to this gear 30. In this case, the gear portion 20B' is directly engaged, and in the case of the reverse hydraulic clutch mechanism 11, the gear portion 20B is interlocked via an intermediate gear (not shown).

Reference numeral 31 denotes a hydraulic pressure distribution manifold, which connects first oil passages 32, 32' and second oil passages 33, 33' formed in the axial direction on the clutch shafts 12, 12' through seal rings 34, 34', respectively. The flywheel housing 5 is for sending and distributing oil.
It is attached to the front side of the rear wall 6 of the vehicle via bolts.

A connecting member 35 having an oil passage 35A inserted into the upper wall of the flywheel housing 5 is connected to the hydraulic pressure distribution manifold 31 in a communicating manner.

36 is a gear case, and the manifold 3
A case cover 40 having a support cylinder part 39 for a clutch release hub 38 is combined with this gear case 36 as a middle case structure. .

41 is a PTO system propulsion shaft, which has a cylindrical shaft structure, and a needle bearing 42,
It is fitted onto the mantle via a seal 43 etc., and is supported by the gear case 36 and case cover 40 via bearings 44, 45, and furthermore, the front end is connected to the clutch case 47 via an arm 46, and here,
The PTO propulsion shaft 41 is directly connected to the engine.

Reference numeral 48 denotes a PTO transmission shaft system, which is composed of the clutch shaft 12', a transmission shaft 50, etc., which is interlocked and connected to the clutch shaft 12' via a hydraulic clutch mechanism 49, and the clutch shaft 12' is connected to the hydraulic distribution manifold 3.
1 and the gear case 36, and are operatively connected by a gear transmission mechanism 53, shown as a deceleration figure, consisting of a gear 51 on the propulsion shaft 41 and a gear 52 on the clutch shaft 12.

54 is a clutch mechanism, which consists of a release fork 55, a release hub 38, etc.
5 in the clockwise direction in FIG. 1, the clutch lever 56 is pressed and the clutch 8 can be disconnected.

In FIG. 2, 57 is a creep mechanism;
A transmission shaft 59 is connected to the speed change subshaft 29 via a coupling ring 58, and a creep output shaft 60 is provided on an axial extension line of the transmission shaft 59, and both shafts 59,
60 can be disconnected via a shifter 61, and this creep mechanism 57 is built in an intermediate case 62.

Further, 63 is a PTO primary transmission mechanism, which is shown as a two-speed transmission in this example, and 64 is a PTO secondary transmission mechanism, which is shown as a two-speed transmission built in the intermediate case 62 in this example. There is.

In Fig. 3, 64 is a differential mechanism, and the second
A drive shaft 68 of an auxiliary transmission mechanism 67 is built in the transmission case 65 and is interlocked with the output shaft 60 of the creep mechanism 57 via a coupling ring 66, and is interlocked with the differential mechanism 64.

A PTO shaft 69 is supported by a bearing device 70 at the rear of the second transmission case 65, and is operatively connected to the PTO secondary transmission mechanism 64 via an intermediate shaft 71 and the like.

72 is a front wheel drive propulsion shaft device, which includes a gear 73 on the drive shaft 68 and an idling gear 7 on the intermediate shaft 71.
A gear 76 in a power take-off case 75 is interlocked with the power take-off shaft 75 through a shifter 77, and a power take-off shaft 78 can be turned on and off via a shifter 77.
9 are connected via a coupling ring 80 or the like, and are operatively connected to a front wheel differential mechanism (not shown).

Note that 81 indicates a propulsion shaft cover, which is extendable and retractable due to its nested structure.

In FIG. 1, the forward rotation hydraulic clutch mechanism 10 is shown to be rotatable relative to the PTO transmission shaft system 48, but the clutch mechanisms 10 and 11 may be reversed vertically from that shown in the figure.

Referring to FIGS. 4 to 12, external appearances of the hydraulic distribution manifold, gear case, cover, and tractor are shown.

4 and 5 show the hydraulic distribution manifold 31, which has a mounting hole 82 on the outer periphery, a fitting recess 83 for the seal ring 34 at the upper part, and a fitting recess 83 for the case cylinder part 37 at the middle in the vertical direction. The hole 84 has an insertion hole 85 for the clutch shaft 12' in the lower part thereof.

6 to 8 show the gear case 36, which has a cylindrical portion 37 in the upper part aligned with the fitting hole 86 of the bearing 45, and a clutch shaft 1 in the lower part.
It has an insertion hole 87 of 2', and a screw hole 88 for assembly and disassembly and a mounting hole 89 on the outer periphery.

9 to 11 show a gear case cover 40, which has a fitting recess 90 for a bearing 44 and a release hub support cylinder 39 connected to each other on the upper part, and
There are spring hooks 91 on both sides of the upper part for hooking the return spring of the release hub 38, and the clutch shaft 12'
It has a fitting recess 93 for receiving the front end of the gear case 36 via a bearing 92, a screw hole 94 for assembly and disassembly is provided on the front side, and a mounting hole 95 is provided on the outer periphery so that it can be attached to the middle structure together with the gear case 36. It is assembled into two parts and can be disassembled back and forth.

Furthermore, FIG. 12 shows a tractor 96 incorporating the transmission device of the present invention, in which 97 is a front wheel, 98 is a rear wheel, it is a two-wheel, four-wheel type, and has a driver's seat 99.
The handle 100 is of a reverse type that can be freely changed back and forth.

(Effects of the Invention) According to the present invention, a forward rotation hydraulic clutch mechanism 10 and a reverse rotation hydraulic clutch mechanism 11 are attached to the traveling system propulsion shaft 3 which is interlocked with the engine 1 via the clutch 8, on both sides of the propulsion shaft 3. are provided so that they can be freely interlocked with each other, and the output sides of the hydraulic clutch mechanisms 10 and 11 can be freely interlocked with the traveling system transmission shaft 27, and a PTO system that is directly connected to the engine 1 is provided on the traveling system propulsion shaft 3. A gear transmission mechanism 53 is provided on which the propulsion shaft 41 is fitted, and which allows the PTO transmission shaft system 48 having a clutch 49 in the middle to freely interlock with the PTO system propulsion shaft 41. Since either the forward rotation hydraulic clutch mechanism 10 or the reverse rotation hydraulic clutch mechanism 11 is fitted and supported so as to be relatively rotatable, there are the following advantages.

The traveling system can be rotated in forward and reverse directions by hydraulic clutch mechanisms 10 and 11 on the engine 1 side, allowing transmission of power to the tractor 96 that is compatible with reverse, while also making it possible to independently transmit power to the traveling system and the PTO system.

That is, a PTO system propulsion shaft 41 directly connected to the engine 1 is fitted over the traveling system propulsion shaft 3,
PTO transmission shaft system 48 with clutch 49 in the middle
A gear transmission mechanism 53 is provided that allows the PTO system propulsion shaft 41 to freely interlock with the PTO transmission shaft system 48.
Since either the forward rotation hydraulic clutch mechanism 10 or the reverse rotation hydraulic clutch mechanism 11 is fitted and supported so as to be relatively rotatable,
In the PTO transmission shaft system 48, that is, in the clutch shaft 12', transmission is carried out via the clutch element in the traveling system, and in the PTO system, transmission is carried out by the shaft itself, so that one shaft has two functions. Therefore, there is an advantage that the running system and the PTO system can be made independent while achieving structural simplification.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional side view showing the main parts of the present invention;
The figure is a vertical side view of the intermediate transmission section, FIG. 3 is a vertical side view of the rear transmission section, FIG. 4 is a front view of the hydraulic pressure distribution manifold, and FIG. 5 is a cross-sectional view taken along line A-A in FIG. Figure 6 is a front view of the gear case, Figure 7 is a front view of the gear case.
8 is a sectional view taken along line C-C in FIG. 6, FIG. 9 is a front view of the gear case cover, FIG. 10 is a sectional view taken along line D-D in FIG. FIG. 11 is a sectional view taken along line E-E in FIG. 9, and FIG. 12 is an external view of the tractor. 1...Engine, 3...Travel system propulsion shaft, 8...
Clutch, 10...Forward rotation hydraulic clutch mechanism, 1
1...Hydraulic clutch mechanism for reverse rotation, 41...PTO system propulsion shaft, 48...PTO transmission shaft system, 49...PTO
The clutch of the system.

Claims (1)

[Claims] 1. A forward rotation hydraulic clutch mechanism 10 and a reverse rotation hydraulic clutch mechanism 11 are respectively provided on both sides of the propulsion shaft 3, sandwiching the propulsion shaft 3, so as to be freely interlocked with each other. In one in which the output sides of the hydraulic clutch mechanisms 10 and 11 can be freely interlocked with the traveling system transmission shaft 27, the hydraulic clutch mechanisms 10 and 11 are directly connected to the engine 1 on the traveling system propulsion shaft 3.
A PTO transmission shaft system 48 having a clutch 49 in the middle and a PTO transmission shaft system 48 fitted with a PTO system propulsion shaft 41 are fitted together.
A gear transmission mechanism 53 is provided that can freely interlock with the PTO system propulsion shaft 41, and either the forward rotation hydraulic clutch mechanism 10 or the reverse rotation hydraulic clutch mechanism 11 can be relatively rotated on the PTO transmission shaft system 48. A tractor transmission device characterized in that it is fitted and supported.