JPS5832019Y2 - Thrust bearing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thrust bearing device suitable for supporting a shaft, such as a drive shaft inside a transmission case of an agricultural tractor, in which the direction of thrust applied to it is reversed when moving forward and backward. The purpose is to securely tighten the inward thrust bearing and the outward thrust bearing on the shaft.

Since thrusts in different directions act on the drive shaft of the mission case when moving forward and when moving backward, in order to support this drive shaft on the side wall of the mission case, two bearings are used, one for inward thrust and one for outward thrust. In that case, conventionally there was a space between both thrust bearings, so both bearings had to be tightened with an appropriate load, and if they were not tightened enough, wear would occur and play would occur. There was a problem that made it easy for complaints to occur.

The present invention is intended to solve the above-mentioned conventional problems, and will be explained below with reference to the drawings.

In the figure, mission case 1 has an open main shaft 2 and PTO at the top.
A shaft 3 is rotatably supported, and a drive shaft 4 is rotatably supported below it.

A clutch housing (not shown) is attached to the front end wall 5 of the transmission case 1 with a plurality of bolts, and the main shaft 2 is connected to the engine through a main clutch (not shown) in the clutch housing, and is connected to the engine via the PTO. The shaft 3 is also connected to the engine via a PTO clutch in the clutch housing.

An integral sliding gear 6.7 and other integral sliding gears 8 and 9 are spline-fitted to the outer periphery of the main shaft 2, and furthermore, another integral gear 10 and 11 is fitted for rotation only. .

The PTO axis 3 is located at the rear inside the mission case 1 (to the right of the figure)
and is connected to the PTO shaft protruding rearward from the rear end wall of the transmission case 1.

In order to support the drive shaft 4, a bearing retainer 14, which also serves as a part of the end wall, is fitted into the hole 13 of the front end wall 5 of the mission case 1 through a shim 15 in a ferrule type. It is fixed with bolts 16.

The bearing retainer 14 includes a bearing support hole 17, and a snap ring 18 fits into an annular groove provided in the longitudinal center of the bearing support hole 17, forming a flange that protrudes from the bearing support hole 17 toward its center. ing.

Outer races 21 and 22 of tapered roller bearings 19 and 20 are fitted into the bearing support hole 17 on the inside (inside the case, that is, on the right side in the figure) and on the outside (on the left side in the figure) of the snap ring 18 . is in contact with.

The inner races 23, 24 of both bearings 19, 20 are connected to the sleeve 26 with a spacer 25 in contact with the opposite end faces.
The sleeve 26 is slidably fitted onto the drive shaft 4.

The sleeve 26 includes a flange 28 that contacts the outer end surface 27 of the inner race 24, and this flange 28 contacts the nut 30 via a non-rotation washer 29.

The protrusion on the inner periphery of the non-rotating washer 29 fits into the groove on the drive shaft 4, and when the nut 30 is screwed onto the drive shaft 4 and an appropriate preload is applied to the sleeve 26, a part of the outer periphery of the washer 29 is removed. The rotation of the nut 30 is prevented by folding the nut 30 upward.

The length of the sleeve 26 is the inner end surface 31 of the inner race 23.
It is determined that the sleeve 26 does not protrude further.

A counter shaft 34 is rotatably supported on the drive shaft 4 via a ball bearing 32 and a needle roller bearing 33, and this counter shaft 34 meshes with the gears 35 to 38 that mesh with the sliding gear and the gear 10. It has a gear 39 and external teeth 41 forming a clutch 40.

In the ball bearing 32, an inner race 42 is fitted up to a stepped portion 43 of the drive shaft 4, and a spacer 44 is sandwiched between the inner race 42 and the inner end surface 31 of the inner race 23.

The drive shaft 4 has a bevel gear 47 at its rear end that meshes with a ring gear 46 of the tough mechanism, and the part just before that is supported by a boss 49 that is integrated with the transmission case 1 via a ball bearing 48, and is slidable just before the bearing 48. A moving gear 50 is spline-fitted and has internal teeth 51 of the clutch 40 .

Since the ball bearing 48 is slidable in the hole of the boss 49, the axial position of the drive shaft 4 is between both bearings 1 at the front end.
It is determined by 9,20.

That is, the positions of the bearing retainer 14 and the snap ring 18 with respect to the front end wall 5 of the mission case 1 are determined by the shim 15, and the positions of both bearings 19 are determined by the snap ring 18.
, 20 are fixed, and the parts between the stepped portion 43 and the inner race 23, 20, 20, 20, 20 are fixed, and the inner races 23, 24, 42. Spacer 25°44, sleeve 26. Since the washer 29 is tightened with strong force between the nut 30 and the stepped portion 43,
The position of the drive shaft 4 relative to both bearings 19, 20 is fixed.

The position of the bevel gear 47 relative to the ring gear 46 can be adjusted by increasing or decreasing the number of shims 15.

While moving forward, the drive shaft 4 receives thrust in the direction of arrow A (outward) from the ring gear 46, and this thrust is supported by the tapered roller bearing 19 and the snap ring 18.

Further, while the drive shaft 4 is moving backward, it receives thrust in the direction of arrow B, and this thrust is supported by the tapered roller bearing 20 and the snap ring 18.

That is, the bearing 19 functions as an outward thrust bearing, and the bearing 20 functions as an inward thrust bearing.

As explained above, according to the present invention, (a) both bearings 19
．． By arranging the spacer 25 between the inner races 23 and 24 of 20, the distance between the stepped portion 43 and the nut 30 is maintained while accurately maintaining the longitudinal position of the drive shaft 4 with respect to the flange 18 (for example, a snap ring). A sufficiently large tightening load can be taken, eliminating the risk of wear and play in various parts.

(b) By tightening the bearing retainer 14 to the outer surface of the front end wall 5 of the mission case 1 with a plurality of bolts 16 via shims 15, the drive shaft 4 can be adjusted by increasing or decreasing the shims 15.
By moving the bevel gear 47 in the longitudinal direction, the longitudinal position (meshing position) of the bevel gear 47 with respect to the ring gear 46 can be accurately adjusted.

(C) The inner races 23 and 24 of both bearings 19 and 20 and the spacer 25 were fitted into the sleeve 26, and the integral flange 28 formed at the outer end of the sleeve 26 was brought into contact with the outer end surface 27 of the inner race of the outer bearing 20. As a result, the bearing retainer 14, flange 18, both bearings 19, 20, spacer 25, and sleeve 26 can be handled as one unit, and attachment and detachment of these parts to and from the hole 13 in the drive shaft 4 or the front end wall 5 is extremely easy. becomes easier.

That is, when removing these parts to adjust the thickness of the shim 15, etc., loosen the nuts 30 and bolts 16 and pull the bearing retainer 14 out of the hole 13 to the left in the figure, then the flange 18, the outer bearing 20, The sleeve 26 moves to the left along with this, and the inner bearing 19 and spacer 25, which are held between the bearing retainer 14 and the sleeve 26, are also pulled out together.

When installing a bearing unit made up of these parts, be sure to insert the entire unit between the drive shaft 4 and the hole 13 at the same time, taking care not to cause any axial misalignment between the bearing retainer 14 and the sleeve 26. And Natsu 30 and Boruto 1
6 should be screwed together.

Note that when embodying the present invention, an integral flange may be formed in the bearing support hole 17 instead of the snap ring 18.

Instead of the thrust bearings 19 and 20, tapered roller bearings, thrust ball bearings, spherical roller bearings, etc. may be used.

Also, depending on the structure of the transmission, ball bearings 32. The spacer 44 can be omitted.

In that case, the inner race 23, 24. Only the spacer 25, flange 28 and washer 29 are clamped.

The present invention can be applied even when the direction of thrust is only one direction, but it is applicable to the support part of a shaft such as the drive shaft 4 where the direction of thrust changes when moving forward and backward as shown in the embodiment drawing. It is particularly advantageous to employ

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing the case where the present invention is applied to a transmission case of an agricultural tractor. 1...Mission case, 4...Drive shaft, 14...Bearing retainer (end wall), 17
...Bearing support hole, 18...Snap ring (flange), 19.20...Taper roller bearing (outward and inward thrust bearing), 21.
22...Outer lace, 23.24...
...Inner lace, 25... Spacer, 30
...Natsuto, 43...Danbe.

Claims (1)

[Scope of utility model registration request] A bearing support hole 17 is formed by fastening the bearing retainer 14 to the outer surface (case outer side) of the front end wall 5 of the mission case 1 with a plurality of bolts 16 via shims 15. 17 A flange 18 is provided on the inner surface of the central part, and a bearing support hole 1 is provided inside the flange 18 (on the inside of the case).
The outer race 21 of the outward thrust bearing 19 is attached to 7, and the inward thrust bearing 20 is attached to the outer bearing support hole 17.
The inner races 23 and 24 of both bearings 19 and 20 are respectively fitted and applied to the flange 18.
The spacer 25 disposed therebetween is fitted into the cylindrical sleeve 26, the integral flange 28 formed at the outer end of the sleeve 26 is brought into contact with the outer end surface 27 of the inner race of the outer bearing 20, and the sleeve 26 is moved in the longitudinal direction. Fitted onto the movable drive shaft 4, a bevel gear 47 provided at the rear end of the drive shaft 4 is engaged with the ring gear 46, and the inner race inner end surface 31 of the inner bearing 19 is connected to the stage on the drive shaft 4. The flange 28 of the sleeve 26 is screwed onto the drive shaft 4 outside the case. A thrust bearing device characterized by being tightened.