JPS6054538B2 - power take-off device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a power extraction device for a power agricultural machine, such as a tractor.

When extracting power from a transmission mechanism in a gear case via a hydraulic clutch mechanism, a clutch gear, which is loosely fitted to an output shaft with a portion protruding from the gear case and meshes with an input gear;
A clutch housing for a hydraulic clutch is formed on the body,
It is known that the number of related components is reduced and the shape is made smaller.

However, in order to assemble the output shaft and hydraulic clutch into the gear case, the hydraulic clutch must be inserted into the gear case through an opening provided in the gear case, supported by hand, and then inserted from the side of the gear case. The spline boss of the output shaft must be fitted into the spline hole of the gear case, and at the same time, the output shaft must be fitted into the bearing of the gear case, and it is extremely difficult to perform such key money setting work in a narrow space.

Therefore, in this invention, the following technical measures have been taken to facilitate the installation work of the device.

That is, the clutch gear 5 loosely fitted onto the output shaft 3 is connected to the output shaft 3 by the hydraulic clutch 13 which is fitted onto the output shaft 3 and whose housing 7 is integrally formed with the clutch gear 5.
The hydraulic clutch 13 is installed inside the gear case 1 and the clutch gear 5 meshes with the gear 4 on the input side inside the gear case 1.
In this power extraction device, the gear case 1 has an assembly hole lb slightly larger than the external shape of the hydraulic clutch 13 on the inlet side thereof, and an assembly hole lb in the inner part thereof. Bearing 2b that can support the side of output shaft 3
are respectively provided, and the output shaft 3 with the hydraulic clutch 13 installed is inserted into the gear case 1 through the installation hole lb, and this rear side is pivotally supported by the gear case 1 via the bearing 2b. At this time, the clutch gear 5 meshes with the gear 4, and the vicinity of the protruding side of the output shaft 3 is pivotally supported by a cover 45 attached to the gear case 1 so as to close the assembly hole 1b. The structure is as follows. With such a configuration, the present invention was able to obtain the following technical effects.

That is, the output shaft 3 and the hydraulic clutch 13 pre-assembled therein are inserted into the gear case 1 through the installation hole 1b, which is provided on the inlet side of the gear case 1 and is slightly larger than the shape of the hydraulic clutch 13. Therefore, the rear shaft support of the output shaft 3 meshes with the gear 4 of the clutch gear 5, and the protruding side of the output shaft 3 is supported on the gear case 1 by the cover 45 attached to the gear case 1. Therefore, the hydraulic clutch 13 can be easily and accurately assembled to the output shaft 3 outside the gear case 1 in a large working space. The fitting of the spline boss of the shaft 3 with the spline holes of the friction plates 8 and 9 has become extremely easy, resulting in a large benefit in reducing assembly man-hours.

Next, the present invention will be explained based on one embodiment shown in the drawings. As shown in FIG. The boss portion 6 of the clutch gear 5 always meshes with the input side gear 4 provided to be rotationally driven via an appropriate transmission mechanism.
The clutch gear 5 is loosely fitted into the output shaft 3 so that it can rotate freely, and a hollow cylindrical housing 7 is provided on the side surface near the outside of the clutch gear 5. The housing 7 has a groove 7 parallel to the longitudinal direction of the cylinder.
A large number of holes a are bored in the outer circumferential direction of the housing 7.

Furthermore, the output shaft 3 is provided with a spline boss 3a between the bearings 2a and 2b, and a spline boss 3b is also provided on the portion projecting outward from the gear case 1. Let's go. Then, the inner hole 8b of the friction plate 8 provided with gear-shaped teeth 8a on the outer periphery is loosely fitted into the spline boss 3a, and at this time, the teeth 8a are engaged with the grooves 7a of the housing 7 to cause friction. The plates 8... are movable only in the cylinder length direction toward the housing 7, and a friction plate 9 having a spline hole 9a in its inner hole is interposed between the friction plates 8, 8, and the spline hole is inserted into the housing 7. 9a is engaged with the spline boss 3a of the output shaft 3, and these friction plates 8 are formed in the housing 7 so as to be movable only in the axial direction with respect to the output shaft 3, and the boss portion 6 and the housing a ring-shaped cylinder chamber 10 surrounded by
By tightly fitting the piston 11 into the housing 7 and supplying pressure oil to the groove 11a formed on the back surface of the piston 11, the housing 7
The friction plates 8... and 9... are pressed together by the retaining ring 12 fitted to the piston 11, and the clutch gear 5 is fixed to the output shaft 3. If the pressure oil is discharged from 11a (although not shown, the piston 11 may be configured to be returned in the opposite direction to the above-mentioned pushing direction by a return spring), the friction plates 8... and 9 are separated from each other, and the clutch gear 5 is formed into a hydraulic clutch 13 that freely rotates with respect to the output shaft 3. In addition, in order to supply pressure oil to the cylinder chamber 10, an oil passage 6a provided in the boss portion 6 is communicated with a ring groove 3c provided in the output shaft 3.
An oil passage 3d provided in the output shaft 3 is connected to the oil passage 1a of the gear case 1 so as to communicate with the oil passage 1a of the gear case 1, and pressurized oil from the oil pump 41 is supplied to the cylinder chamber 10 by operating the switching valve 42. The pressure oil in the chamber 10 is returned to the tank 43 via the switching valve 42, and the gear case 1 has an assembly hole 1b on the inlet side that is slightly larger than the maximum dimension D in the direction perpendicular to the axis of the hydraulic clutch 13. A bearing 2a for pivotally supporting the vicinity of the protruding side of the output shaft 3 can be attached to the cover 45, which is open and can be attached to the gear case 1 with bolts 44 so as to close the installation hole 1b. If the rear side of the output shaft 3 and the hydraulic clutch 13 are inserted into the gear case 1 through the installation hole 1b with the hydraulic clutch 13 assembled in the output shaft 3 in advance outside the gear case 1, Output shaft 3
The rear part of is pivotally supported by the gear case 1 via the rear bearing part 2b, and the clutch gear 5 is meshed with the gear 4. When the cover 45 is attached to the gear case 1,
The vicinity of the protruding portion of the output shaft 3 is configured to be supported by a bearing 2a attached to the cover 45. During this assembly work, it is preferable to install the bearing 2b on the back side in advance at the back of the gear case 1, but it is also possible to install the bearing 2b on the back side of the output shaft 3 in advance. Bearing 2 on the inlet side
A may also be installed in advance near the protrusion of the output shaft 3, and bearings of various structures can be used as the bearings 2a and 2b.

The transmission device configured in this manner is used, for example, in a tractor transmission mechanism illustrated as a power transmission system diagram in FIG.
Input gear 1 is connected to the rear of input shaft 16 via
6a is provided, and meshes with the main transmission gear group 18 in which the main transmission shaft 17 rotates freely, and the input gear 16a, and the PTO shaft 1
A main transmission mechanism includes a clutch gear group 21 that can selectively fix the gears of the main transmission gear group 18 to the main transmission shaft 17 by constantly meshing the main transmission counter gear group 20 with the upper part of the main transmission gear group 18 idling. 22 is provided, and the sub-transmission gear group 24 which freely rotates on the sub-transmission shaft 23 and the sub-transmission counter gear group 26 which meshes with the gear 25 of the main transmission shaft 17 and freely rotates on the P'10 shaft 19 are always connected. An auxiliary transmission mechanism 28 is provided which includes a clutch gear group 27 that can be meshed to selectively fix the gears of the auxiliary transmission gear group 24 to the auxiliary transmission shaft 23, and an ultra-low speed mechanism having the same configuration as the main transmission mechanism 22. At 29, this auxiliary transmission shaft 23 and a drive pinion shaft 30 are provided so as to be interlocked, and a gear 31 fitted on this drive pinion shaft 30 is connected to the gear 4 via a counter gear 32 which is freely rotated on the PTO shaft 19. In conjunction with
The front wheels of this tractor are driven by a universal joint shaft (not shown) fitted to the spline boss 3b of the output shaft 3, and the drive pinion shaft 30 is connected to a brake mechanism via a rear wheel differential gear mechanism 33. Left and right rear wheels 35, 35 each having a wheel 34 are provided so as to be driven.

The counter gear 37, which freely rotates on the PTO shaft 19 and meshes with the gear 36 fitted to the input shaft 16, is provided so that it can be fixed to the PTO shaft 19 by engaging and disengaging the clutch gear 38. Intermediate P in which the shift gear 39, which can be freely engaged and disengaged from 37, slides only in the axial direction.
A TO shaft 40 is provided. Therefore, the switching valve 42
When the pressure oil of the oil pump 41 is supplied to the concave groove 11a of the piston 11, the piston 11
is pushed and the friction plates 8 and 9 are brought together, so that the clutch gear 5 is fixed to the output shaft 3 and the rotational power of the gear 4 on the input side can be taken out from the output shaft 3.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing one embodiment of the hydraulic transmission of the present invention, and FIG. 2 is a power transmission system diagram of a tractor using the same transmission. Code explanation 1... Gear case, 1a, 3d, 6a
...Oil passage, 1b...Incorporation hole, 2a, 2
b...Bearing, 3...Output shaft, 3a, 3
b・・・・・・Spline boss, 3c・・・・・・
Ring groove, 4, 25, 31, 36... Gear, 5, 3
8...Clutch gear, 5a...Rim part, 6
...Boss part, 7...Housing, 7a
...Groove, 8,9...Friction plate, 8a...
...Teeth, 8b...Inner hole, 9a...Spline hole, 10...Cylinder chamber, 11...Zeston, 11a...Concave groove, 12... Retaining ring, 13... Hydraulic clutch, 14... Engine, 15... Main clutch, 16...
・Input shaft, 16a...Input gear, 17...
...Main transmission shaft, 18...Main transmission gear group,
19... PTO shaft, 20... Main transmission counter gear group, 21, 27... Clutch gear group,
22... Main transmission mechanism, 23... Sub-transmission shaft, 24... Sub-transmission gear group, 26...
Sub-transmission counter gear group, 28...Sub-transmission mechanism, 2
9... Ultra low speed mechanism, 30... Drive pinion shaft, 32, 37... Counter gear, 34... Brake mechanism, 33... Rear wheel differential gear mechanism, 35... Rear wheel, 39...
・・Uft gear, 40・・Intermediate PTO shaft, 41・
...Oil pump, 42 ...Switching valve, 43
...Tank, 44...Volt, 45...
・Cover, D...Maximum dimensions.

Claims (1)

[Claims] 1. The clutch gear 5 loosely fitted onto the output shaft 3 is fixed to the output shaft 3 by a hydraulic clutch 13 which is fitted onto the output shaft 3 and whose housing 7 is formed integrally with the clutch gear 5. or reverse rotation, so that the power of the gear 4 can be taken out from the output shaft 3 in an assembled state in which the hydraulic clutch 13 is installed in the gear case 1 and the clutch gear 5 meshes with the gear 4 on the input side in the gear case 1. In the power take-off device, the gear case 1 has an inlet hole 1b on the inlet side thereof, which is slightly larger than the outer diameter of the hydraulic clutch 13, and a side part of the output shaft 3 can be pivotally supported in the inner part of the inlet hole 1b. Bearing 2b,
The output shaft 3 in which the hydraulic clutch 13 is installed
is inserted into the gear case 1 through the assembly hole 1b, and when this rear side is pivotally supported by the gear case 1 via the bearing 2b, the clutch gear 5 meshes with the gear 4, and
A power extraction device configured such that the vicinity of the protruding side of the output shaft 3 is pivotally supported by a cover 45 attached to the gear case 1 so as to close the assembly hole 1b.