JPS6111561Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a PTO transmission device, and in order to link the PTO drive shaft and its driven side PTO shaft with a reduction gear, the distance between the upper and lower shafts of the PTO drive shaft and the PTO shaft must be adjusted. The main purpose is to make it applicable to reduction gears.

The PTO transmission gear reduces and links the PTO shaft, and has various transmission shafts mounted on the transmission case.

Conventionally, when a transmission shaft is mounted on a transmission case, a bearing is mounted in a bearing mounting hole formed in the case to support the transmission shaft.

However, since the distance between the shafts of the bearing mounting hole has already been determined by a transfer machine, etc., when the PTO reduction gear is installed in the transmission case, it is necessary to use a standard that matches the bearing mounting hole.
Only a PTO reduction gear can be installed, and in order to incorporate a PTO reduction gear with a different reduction ratio, a transmission case with matching bearing mounting holes is required, making multidimensional design difficult.

The present invention was developed in view of the above-mentioned circumstances, and is designed to be installed in the transmission case at the rear end of the PTO drive shaft.
A PTO reduction gear is provided, and the output shaft of the PTO reduction gear is loosely inserted into the bearing mounting hole formed in the transmission case, and the output shaft of the PTO reduction gear is loosely inserted into the shaft center extension of the output shaft.
A PTO shaft is connected to the transmission case, an opening is formed in the side wall of the transmission case, a bearing mounting part is formed in the lid that covers the opening, and the PTO shaft is connected to the PTO shaft through a bearing mounted on the bearing mounting part. It is characterized by supporting the shaft side.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall schematic diagram of an embodiment of the present invention applied to a tractor transmission. In FIG. 1, 1 is a main transmission for traveling, 2 is a sub-transmission for traveling, and 3 is a differential. .

The main transmission 1 includes a first transmission case 4
In addition, the sub-transmission device 2 and the differential device 3 are respectively contained and incorporated in the second transmission case 5.

Reference numeral 6 denotes a driving propulsion shaft, which has a cylindrical shaft structure and can be rotated intermittently by engaging and disengaging a clutch 7, and has transmission gear groups 8 of different diameters fixed at predetermined intervals in the axial direction.
The propulsion shaft 6 is attached to a bearing 9 in the first transmission case 4.
is supported through.

Reference numeral 10 denotes a PTO propulsion shaft (hereinafter referred to as the PTO drive shaft), which is passed through the traveling propulsion shaft 6 in a so-called skewer shape and supported so as to be relatively rotatable, and rotates intermittently when the clutch 11 is engaged and disengaged. do.

That is, both the traveling propulsion shaft 6 and the PTO drive shaft 10 rotate relative to each other in response to engine power.

Reference numeral 12 denotes a main transmission shaft for traveling, which is mounted parallel to the first transmission case 4 above the propulsion shaft 6 via a bearing 12A. The transmission gears 14 are fitted on the sleeves so as to be relatively rotatable and interlocked with the corresponding gears of the transmission gear group 8, and can be changed in speed by sliding the shifter 14, which constitutes the main transmission 1.

15 is an intermediate case, which is the first case 4.
and the second case 5, and each case 4, 5, and 15 constitute a tractor body.

Reference numeral 16 denotes an auxiliary transmission shaft, which is supported by the second case 5 on the axial extension of the main transmission shaft 12 via a bearing 17, and has two gear groups 18 of different diameters in this example.

Reference numeral 19 denotes a differential drive shaft, on which a sub-transmission gear group 20 is fitted so as to freely rotate, and the gear group 20 can be freely engaged with and disengaged from the differential drive shaft 19 by sliding a shifter 21 . Note that one of the sub-transmission gears 20 is directly interlocked with the corresponding transmission gear 18 on the sub-transmission shaft 16, and the other is interlocked with the corresponding transmission gear 18 via the intermediate gear 22, and there is a sub-transmission device capable of forward and reverse rotation. 2.

Note that the differential device 3 is interlocked with rear wheels (not shown) via a final reduction gear.

Further, the differential drive shaft 19 is supported by the second transmission case 5 via a bearing 23, and is substantially coaxial with the extension of the axis of the propulsion shaft 6.

24 is a PTO transmission device, and intermediate case 1
5, a transmission shaft 28 connected to the output shaft 26 of the PTO reduction gear 25 via a coupling 27, and a PTO shaft connected to the transmission shaft 28 via a coupling 30. 31
The PTO shaft 31 is the PTO drive shaft 1.
0 and the differential drive shaft 19, and are parallel to each other and connected to the axial extension of the deceleration output shaft 26.

Referring to FIGS. 2 and 3, the PTO reduction gear 25 is provided in the transmission case (in this example, the intermediate case 15) at the rear end 10A of the PTO drive shaft 10. A deceleration input shaft 33 is connected to the deceleration input shaft 33 via a coupling ring 32, and a deceleration output shaft 26 is provided below the shaft 33 in parallel.
are supported by the intermediate case 15 via
3 and 26 are interlocked for deceleration through a fixed gear group 36.

The deceleration output shaft 26 is loosely inserted into a bearing mounting hole 37 formed in the second transmission case 5.

That is, the bearing mounting hole 37 is formed under the standard together with the mounting holes of the bearings 17 and 23 of the differential drive shaft and the sub-transmission shaft, and the output shaft 26 is supported in this bearing mounting hole 37 via the bearing. If so, the distance between the shafts is standardized as shown by the symbol L in FIGS. 2 and 3, but by loosely inserting the output shaft 26 into the mounting hole 37, the distance between the shafts can be changed, for example, as shown by the symbol L1. This makes it possible to apply the distance between the axes that matches the speed reducer 25.

Reference numeral 38 designates an opening for the abdominal power extraction device 39, which is formed in the side wall 5A of the second mission case 5 (in this example, the bottom side wall or the vertical side wall). When installing the power take-off case 40, as shown in FIG.
1, the opening 38 is closed and the power take-off device 39 is closed.
When the device is not installed, the lid body 41 as shown in Fig. 3 is used.
It is closed with a lid.

In either embodiment, the lid body 41 is removably fixed with bolts 43 with its mounting flange 42 superimposed on the side wall 5A, but the lid body 41 has a bearing mounting portion 44 that is integrated into the front and rear in this example. The mounting portion 44 is inserted into the opening 38 by a so-called spigot fitting, and the PTO shaft 31 side (in this example, the transmission shaft 28) is supported via a bearing 45 mounted on the mounting portion 44.

Therefore, the output shaft 26 of the PTO reduction gear 25 is supported on the lid 41 side via a bearing 45, and the bearing mounting portion 4
Adjustment can be made by preparing 4 different height positions, or by intervening a shim, flat washer, etc. between the mounting flange 42 and the side wall 5A.

When the power take-off device 39 is attached as shown in FIG. 2, the differential drive shaft 19 is provided with a drive gear 46.
The gear 47 is fixed to the PTO
The interlocking gear 47 is fitted onto the shaft 31 or the transmission shaft 28 thereof so as to be relatively rotatable, and a power take-off gear 48 is provided which is interlocked with the interlocking gear 47. The power take-off shaft 49 is engaged and disengaged by fitting a shifter 50 to and from the power take-off shaft 49.

Note that the power take-off shaft 49 can be used to take out power for abdominal loading work, as well as for front wheel drive.

According to the embodiment configuration of the present invention, the PTO drive shaft 1
0 is intermittently rotated by the engagement and disengagement of clutch 11 and PTO
PTO shaft 3 under the required deceleration via the deceleration device 25
1 will be linked.

In order to change the reduction ratio of the PTO reduction gear 25 in response to the type of tractor, the reduction output shaft 25
is loosely inserted into the bearing mounting hole 37 and supported on the lid 41 side by a bearing 45 attached to the bearing mounting part 44 of the lid 41 that covers the opening 38. Therefore, the output shaft 26 and the PTO The alignment of the axes of the shaft 31 can be adjusted by attaching the lid.

In the present invention, the PTO shaft 31 is interlocked via the PTO speed reducer 25 provided in the transmission case 15 at the rear end of the PTO drive shaft 10, so that the PTO shaft 31 can be rotated at a reduced speed for work. In that case, since the deceleration output shaft 26 is loosely inserted into the bearing mounting hole 37 formed in the transmission case 5, the deceleration output shaft 26 is loosely inserted into the bearing mounting hole 37 formed in the transmission case 5.
An appropriate distance between the shafts can be taken to comfortably decelerate the PTO shaft 31, and the PTO shaft 31 side is supported via a bearing 45 attached to a bearing mounting portion 44 formed on the lid body 41. , output shaft 26 and
There is an advantage that the PTO shaft 31 can be stably supported in an aligned state.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram of the overall configuration, and FIG. 2 is a sectional view of the main part of the first embodiment.
FIG. 3 is a sectional view of a main part of the second embodiment. 5...Second mission case, 10...
PTO drive shaft, 15... Intermediate case (mission case), 25... PTO reduction gear, 26... Output shaft, 31... PTO shaft, 37... Bearing mounting hole,
38... Opening, 41... Lid, 44... Bearing mounting portion, 45... Bearing.

Claims (1)

[Scope of utility model registration request] Mission case 1 at the rear end of the PTO drive shaft 10
A PTO reduction gear 25 is installed in the transmission case 5, and the bearing mounting hole 37 formed in the transmission case 5 is fitted with the
While loosely inserting the output shaft 26 of the PTO reduction gear 25, the PTO shaft 31 is placed on the axial center extension of the output shaft 26.
and further connect the side wall 5 of the mission case 5.
An opening 38 is formed in A, a bearing mounting part 44 is formed in a lid 41 that covers the opening 38, and the bearing 45 is attached to the bearing mounting part 44.
A PTO transmission device characterized by supporting a PTO shaft 31.