JPS6015018Y2 - PTO idle gear support device - Google Patents

Description

[Detailed description of the invention] This invention is a PTO idle gear support device for an agricultural tractor in which a PTO gear case is fixed to the rear end of the transmission case with a plurality of tightening bolts so as to project laterally from there. Regarding.

In general, in agricultural tractors, the center line (body center) of the combined body (body) of the engine block, clutch housing, and transmission case when viewed from above coincides with the center line (tread center) between the left and right wheels. A PTO shaft for driving a working machine protrudes rearward from the rear end surface of the mission case on the center.

If the center of the aircraft is tilted to the left side of the tread center to improve visibility of the ground contact area of the right front wheel and the area in front of it, in order to position the PTO axis above the tread center, the PTO gear case should be moved to the transmission center. It has to protrude rightward from the rear end of the case, and in that case, if a dedicated support shaft is provided in the PTO gear case to support the idle gear, the PTO gear case becomes complicated and expensive.

The present invention utilizes one of the plurality of tightening bolts for fastening the PTO gear case to the rear end of the transmission case to form a support shaft for the idle gear in the PTO gear case. This is an attempt to solve the above problem, and will be explained below with reference to the drawings.

Figure 1 is a rear view of the carrier cover 1, Figure 2 is the ■- of Figure 1.
■This is a cross-sectional view along the line, and the rear cover 1 can be attached using one long port 3 and five short ports 4 (see Fig. 1) so as to close the rear end opening of the transmission case 2 as shown in Fig. 2. be.

5 is two dowel pins.

In order to arrange the generally parallel bearing holding plate 6 on the front side of the rear cover 1 with a gap between them, the rear cover 1 is integrally provided with four columnar posts 7 (Fig. 3) on the front side, and the front end surface of each boss 7 is The bearing retaining plate 6 is attached at the port 8.

The rear cover 1 and the bearing holding plate 6 each support a pinion shaft 10 that integrally has a pinion 9 and a support shaft 12 to which a first gear 11 is locked via bearings, and the pinion 9 and the first gear 11 are mutually connected. mesh with each other.

The binion 9 extends forward from the rear cover 1 (back side in Figure 1), and there are gates and switching dog clutches on the way.
Connected to the engine via an O friction clutch or only a friction clutch.

The rear cover 1 is integrally provided with a flat cylindrical projecting portion 1a extending downward to the right from the joint with the transmission case, and when the projecting portion 1a is fastened to the transmission case by the long bolt 3, the bolt 3 At the same time, tighten the cylinder shaft 14 to the transmission case.
An idle gear 15 is loosely fitted onto the top, and this idle gear 15 is meshed with the first gear 11.

A cover 18 is attached to the front opening 16 at the tip of the overhang 1a with six bolts 17, and the gate °C axis 19 is supported at two points by this cover 18 and the front wall of the overhang 1a.

A second gear 20, which is keyed at 9 minutes of the PTO shaft in the gear case 1, meshes with the idle gear 15.

The structural details within the gear case 1 are clearly shown in FIG.

In FIG. 2, 21 to 24 are ball bearings, 25 is a collar, 26 is a key, 27 is an oil seal, and 28 is a cover.

The illustrated cylinder shaft 14 has a large-diameter boss portion 14 at the rear end (right end in FIG. 2).
This boss portion 14a fits into a hole 30 provided in the rear wall of the gear case 1, and is kept liquid-tight by an O-ring 31.

By screwing the long bolt 3 into the screw hole 32 of the transmission case 2, the front end surface 33 of the cylinder shaft 14 is attached to the gear case 1.
The front wall of the gear case is pressed against the inner surface 34 of the front wall of the transmission case 2, and the front wall of the gear case in the vicinity thereof is strongly fastened to the transmission case 2.

35 is a needle bearing, and 36 is a thrust bearing.

The rotational force of the engine that has reached the pinion shaft 10 is transferred from the pinion 9 integrated with the pinion shaft 10 to the first gear 11, the idle gear 15, the second gear 20, and the key 26 to the PTO.
Axis 1 axis rotation 9 times.

The long bolt 3 fastens and fixes the cylindrical shaft 14 and the front wall of the gear case 1 to the transmission case 2, and the idle gear 15 freely rotates on the cylindrical shaft 14 via a needle bearing 35.

As explained above, in the present invention, the PTO gear case 1 is fixed to the rear end of the transmission case 2 with a plurality of tightening bolts 3.4 so as to protrude laterally from there, and the inside of the tightening bolts is Using one bolt 3 of
4 to the transmission case 2 and idle gear 15
Since the supporting shaft is formed, there is no need to provide an independent supporting shaft in the gear case 1 to support the idle gear 15, and the structure is greatly simplified, and the cylindrical shaft 14 is firmly fixed to the transmission case 2. As a result, the holding rigidity for the idle gear 15 is increased, and the load applied to the gear case 1 is reduced, which makes it possible to reduce the weight and size of the gear case 1, which is effective in reducing costs.

Furthermore, since the thick part of the load of the supporting portion of the idle gear 15 is carried by the transmission case 2, vibrations are also reduced.

In the present invention, a PTO gear case 1 is fixed to the rear end of a transmission case 2 with a plurality of tightening bolts 3, 4 so as to protrude laterally from there, and one tightening bolt 3 is fixed to an idle position. The gear 15 is placed in the center of the overhanging portion 1a of the gear case 1, and the remaining tightening bolts 4
Tighten the peripheral part of the gear case 1 to the transmission case 2 with Needle bearings 35 are interposed between the waist cylinder shaft 14 and the idle gear 15 so that the cylinder shaft 14 is supported at both ends by the front wall end surface 34 and the hole 30 by fitting through the needle bearings 31 at both ends of the waist idle gear 15. This is a PTO idle gear support device characterized in that a thrust bearing 36 is provided in the PTO idle gear support device.

Therefore, since the cylinder shaft 14 is firmly supported at both ends by the front wall end surface 34 and the hole 30, the cylinder shaft 14 can be fixed so that the central axis of the idle gear 15 does not swing, and the overhang portion 1a, which has a relatively large area, can be tightened. The cylinder shaft 14 can be tightened with the tightening force of the attached bolt 3 without being dented.

In addition, since the large diameter boss 14a is formed on the cylinder shaft 14, the cylinder shaft 14
No matter how strongly the bolts 3 are tightened, a constant gap will always be formed between the cylinder shaft 14 and the gear case 1, and the thrust bearing 36 will prevent the idle gear 15 from moving in the width direction. Idle gear 1 while regulating
5 can be pivoted without resistance.

Moreover, since the needle bearing 35 is interposed between the cylindrical shaft 14 and the idle gear 15, no resistance is applied to the rotation of the idle gear 15 in the radial direction.

[Brief explanation of the drawing]

Figure 1 is a rear view of the gear case, Figure 2 is the ■- of Figure 1.
3 is a cross-sectional view taken along the line 2, and FIG. 3 is a sectional view taken along the line 2--2 in FIG. 1...PTO gear case, 2...Mission case, 3, 4 tightening bolts, 14...
Cylindrical shaft (support shaft), 15... Idle gear.

Claims (1)

[Scope of utility model registration request] In a case where the p'ro gear case 1 is fixed to the rear end of the transmission case 2 using a plurality of tightening ports 3 and 4 so as to project laterally from there, one tightening bolt 3 is attached to the idle gear 15. is placed in the center of the overhang 1a of the gear case 1 that accommodates the Insert the O-ring 31 into the hole 30 of the gear case 1 by inserting the large-diameter boss 14a of the cylinder shaft 14, which is tightened with the bolt 3.
so that the cylinder shaft 14 is supported at both ends by the front wall end surface 34 and the hole 30, and the cylinder shaft 14 and the idle gear 15
A needle bearing 35 is interposed between the idle gear 1 and the idle gear 1.
A PTO idle gear support device characterized in that thrust bearings 36 are provided at both ends of the PTO idle gear support device.