JPS6148028B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission mechanism for a power agricultural machine such as a tractor, and is devised to facilitate the installation of a transmission mechanism into a transmission case.

Conventional transmission mechanisms are assembled inside a mission case by sequentially inserting the components through holes formed at the top of the mission. It was not easy to incorporate it into the transmission mechanism, and it was very dangerous.

Therefore, the present invention has been devised so that it can be temporarily assembled into each transmission mechanism in advance outside the transmission case, and its configuration consists of a front transmission case 1 with an open rear part and a front transmission case 1 with an open front part. a rear transmission case 6; a front wall 8a that can be joined to the rear end of the front transmission case 1; and a rear wall 8b that can be joined to the front end of the rear transmission case 6. case 8, a first transmission mechanism 32 housed in the front transmission case 1, a second transmission mechanism 7 housed in the spacer transmission case 8, and a third transmission mechanism housed in the rear transmission case 6. Transmission mechanism 2
3, the transmission mechanism has a first
The rear part of the transmission shaft 10 of the third transmission mechanism 32 is supported by the front wall 8a of the spacer mechanism case 8, and the rear part of the intermediate shaft 22 of the third transmission mechanism 23 is supported by the rear wall 8b. This transmission mechanism is characterized in that the front part of the shaft 22 is concentrically supported to the rear part of the transmission shaft 10 via a bearing.

Next, the specific structure will be explained based on an embodiment applied to the illustrated tractor. FIG. 1 shows the state after the front transmission mechanism installed inside the front transmission case 1. hand,
This front transmission case 1 is connected to the rear part of an input shaft 3 whose power is connected/disconnected by a main clutch 2 driven by an engine (not shown) using a bearing 4.
A rear transmission case 6 and a front transmission case 1 are pivotally supported on the partition wall 1a of the rear transmission case 6 and are equipped with a drive pinion shaft 5 for driving the rear wheels.
The spacer mechanism case 8 in which the second transmission mechanism 7 is housed is installed between the two using mounting bolts 9, and the front part of the transmission shaft 10 is connected to the rear of the input shaft 3 with a bearing 11 At the same time, the rear portion is pivotally supported to the spacer mechanism case 8 by a bearing 12.

Further, since a power-mounted drive shaft 13 is supported by bearings 14 and 15 in the lower part of the front transmission case 1, a hollow cylindrical counter shaft 16 is connected to the partition wall 1a and the spacer transmission case 9 by bearings 17. , 18, and the transmission shaft 10 includes transmission gears 19a, 19b, which have mutually different outer diameters.
..., and the counter gears 16a, 16b have a fitting structure or a one-piece structure on the counter shaft 16.
...... are provided, and counter gears 16a, 16b...
The input gear 3 is formed at the rear of the input shaft 3 by meshing with the corresponding transmission gears 19a, 19b...
A is engaged with the passive gear 20 of the counter shaft 16, and constant velocity meshing devices 21a and 21b are provided for selectively fixing the input gear 3a, the transmission gear 19a, and the transmission gears 19b and 19c to the transmission shaft 10. The front and rear of an intermediate shaft 22 are supported by the shaft 10 and the drive pinion shaft 5, and the intermediate shaft 2 is
2 is provided to drive the drive pinion shaft 5. The constant velocity meshing devices 21a and 21b have a guide gear 25 fitted to the outer periphery of a hub 24 fitted to the speed change shaft 10, as shown in FIG. 3A, and a spring 2
6, the guide gear 25 is provided so that it can move only in the axial direction relative to the hub 24, and the guide gear 2
The spline teeth 27a of the slide coupling 27 are engaged with the spline teeth provided on the outer periphery of the gear 5, and a gear 28 is fixed to the input gear 3a by caulking or the like, and a gear 29 is fitted to the transmission gear 19a.
Friction gears 30 and 31 each having a cone surface 30a or 31a that can be joined to the cone surfaces 28a and 29a of 8 and 29, respectively, are loosely fitted to the gears 28 and 29, and engaged with a shifter operated by a speed change lever not shown. For example, if the slide coupling 27 is moved to the right in the figure, the guide gear 25 will also move, pushing the friction gear 31 to the right, and the cone surface 31a will come into pressure contact with the cone surface 29a. As a result, the rotational speeds of the transmission gear 19a, the gear 29 and the friction gear 31, which are one unit, match the rotational speed of the transmission shaft 10, the hub 24, the guide gear 25, and the slide coupling 27, which are one unit. If the slide coupler 27 is further moved to the right, its spline teeth 27a will continue to mesh with the guide gear 25 and will engage the spline teeth 31a of the friction gear 31 and the gear 29.
The speed change gear 19a is fixed to the speed change shaft 10 by simultaneously meshing with the spline teeth 29a of the speed change gears 19a, 19b.
. The second transmission mechanism 7 has a back idle gear that meshes with both a back gear 33 fitted to the speed change shaft 10 so as to be able to switch between coupling and idle rotation, and a back drive gear 34 provided on the counter shaft 16. 35, as shown in FIG. When assembled and attached to the transmission case 1, the head 36 of the fixed shaft 36
When the rear wall 1b of the transmission case 1 engages with the notch 36b provided in the notch 36b, the fixed shaft 36 is prevented from rotating.

When installing the above-mentioned input shaft 3, transmission shaft 10, first transmission mechanism 32, etc. in the transmission case 1, as shown in FIG. The intermediate shaft 22 is supported, and the second transmission mechanism 7 is assembled into the spacer mechanism case 8. A bearing 17 is fitted to the front part of the counter shaft 16, and a bearing 18 is used to fit the rear part of the counter shaft 16 to the spacer assembly case 8. Shion case 8
The transmission mechanism 32 is assembled into the transmission shaft 10 and the counter shaft 16, and the input gear 3 at the rear of the input shaft 3 is
After fitting the gear 28 to the input shaft 3, the gear 28 is fixed to the input shaft 3 by caulking, etc., the bearing 4 is fitted to the input shaft 3, and the constant velocity meshing devices 21a, 22b and the second transmission mechanism 7 are fitted. Shifter mechanisms 37a, 37b, . While inserting the transmission mechanism 38 into the transmission case 1 so as to abut the front side wall 8a of the transmission case 8, insert the outer ring 4a of the bearing 4 into the partition wall 1 of the transmission case 1.
Fit into the bearing fitting hole 1c provided in a,
As shown in FIG. 3B, an arcuate portion 3 that can come into contact with about a semicircumference on the outer surface of the outer ring 4a of this bearing 4.
Attach the plate-shaped bearing retainer 39 equipped with the bearing holder 9a to the partition wall 1a using the mounting bolts 40 as shown in FIG.
The front wall 6a of the rear transmission case 6 is brought into contact with the rear side wall 8b of the rear transmission case 6, and the transmission case 1 and the rear transmission case 6 are connected via the spacer transmission case 8 with the mounting bolts 9. It is composed of

The transmission mechanism according to the present invention is constructed as described above, and during assembly work, the rear part of the transmission shaft 10 of the first transmission mechanism 32 is pivotally supported on the front wall 8a of the spacer transmission case 8. And furthermore,
The front part of the intermediate shaft 22 of the third transmission mechanism 23 is concentrically supported to the rear part of the transmission shaft 10 via a bearing, and the rear part of the intermediate shaft 22 is supported to the rear wall 8b of the spacer mechanism case 8. do. Therefore, the speed change shaft 10 and the intermediate shaft 22 can be supported concentrically easily, reliably, and quickly without the need for troublesome efforts such as centering them. Thereafter, by joining the front end 8a of the spacer transmission case 8 to the rear end of the front transmission case 1, the first transmission mechanism 32 is installed inside the front transmission case 1. The assembly of the transmission mechanism is completed by joining the front end of the rear transmission case 6 to the rear wall 8b of the spacer transmission case 8. , the first transmission mechanism 32 and the second transmission mechanism 7 are connected to the spacer mechanism case 8 with a wide working area before joining them to the spacer mechanism case 8.
This allows the mission mechanism to be safely and easily installed in the mission case.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view showing a tractor transmission mechanism to which an embodiment of the present invention is applied, FIG. 2 is a vertical side view showing the transmission mechanism before installation, and FIG.
Figure A is a vertical sectional side view showing one embodiment of the present invention, Figure 4 is a sectional view taken along the line A--A in Figure A, and Figure 4 is a vertical sectional view of essential parts showing the shaft support state of the back idle gear. . Code explanation, 1...Front transmission case,
1a...Partition wall, 1b...Rear wall, 1c...Bearing fitting hole, 2...Main clutch, 3...Input shaft, 4...Bearing, 4a...Outer ring, 5...
Drive pinion shaft, 6...Rear transmission case, 6a...Front wall, 7...Second transmission mechanism, 8
...Space assembly case, 8a...Front side wall, 8b...Rear side wall, 9, 40...Mounting bolt, 10...Shift shaft, 11, 12, 14, 15,
17, 18, 37...Bearing, 13...Power take-off drive shaft, 16...Counter shaft, 16a, 16
b...Counter gear, 19a, 19b...Transmission gear, 20...Passive gear, 21a, 21b...Constant velocity meshing device, 22...Intermediate shaft, 23...Third transmission mechanism, 24...Hub, 25...Guide gear, 26
...Spring, 27 ...Slide coupling spring, 27
a... Spline tooth, 28, 29... Gear, 28
a, 29a, 30a, 31a...cone surface, 3
0, 31... Friction gear, 32... First transmission mechanism, 33... Back gear, 34... Drive gear, 3
5...Back idle gear, 36...Fixed shaft, 3
6a...Head, 36b...Notch, 37a, 37b
...Shifter mechanism, 38...Mission mechanism, 39
...Bearing holder, 39a...Circular part.

Claims (1)

[Claims] 1 Front transmission case 1 with an opening at the rear and rear transmission case 6 with an opening at the front
, a front wall 8a that can be joined to the rear end of the front transmission case 1, and a rear wall 8b that can be joined to the front end of the rear transmission case 6; a first transmission mechanism 32 housed in the transmission case 1;
The transmission mechanism includes a second transmission mechanism 7 housed in a space transmission case 8 and a third transmission mechanism 23 housed in a rear transmission case 6, wherein the first transmission mechanism 32 gear shift shaft 1
The rear part of the intermediate shaft 22 of the third transmission mechanism 23 is pivotally supported by the rear wall 8b, and the front part of the intermediate shaft 22 is pivotally supported by the front wall 8a of the spacer transmission case 8. A transmission mechanism characterized by being concentrically supported at the rear of a shaft 10 via a bearing.