JPS604801Y2 - Locking structure for axles, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking structure for restricting axial movement of a rotating transmission shaft having a bevel gear, such as an axle, supported in a case via a bearing.

Normally, when a rotating transmission shaft with a fixed bevel gear is supported in a transmission case, the movement of the transmission shaft in the axial direction is generally prevented with a nut. This method has been adopted.

If this method is followed, there is a problem that the shaft becomes longer by the threaded portion for screwing the nut, and the case also becomes larger.

Therefore, means for receiving and stopping the thrust force of the rotary transmission shaft using a retaining ring is employed, for example, in the front wheel hub shaft of a vehicle.

Since it is customary to adopt a square cross section as this retaining ring, the circumferential groove for the retaining ring for the shaft is shaped as a square cross section on the hub shaft, and according to this, when bending is applied to the shaft, Because it is a square groove, there was a problem that cracks could occur from the sharp edges.

The purpose of the present invention is to provide a locking structure for an axle, etc. that solves the above-mentioned problems.To achieve this purpose, a rotary power transmission shaft is supported in a case via a bearing, and a boss A bevel gear whose end face faces the bearing in the axial direction is fitted on the outside so that it cannot rotate relative to the bearing, and nine circumferential grooves with a semicircular cross section are formed between the bearing and the boss on the outer periphery of the shaft for rotational transmission, and in the circumferential groove,
A split collar with a circular cross section that protrudes outside the circumferential groove is fitted, and a protrusion that surrounds the outer periphery of the boss is shaped like an overhang to form a thrust collar between the bearing and the split collar on the rotating transmission shaft. are fitted together, and the split collar is held between the bearing and the end face of the boss portion in the axial direction via the thrust collar.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, assuming that it is applied to a front wheel hub shaft of a tractor, but the present invention can also be applied to other shafts and rotary transmission shafts having bevel gears.

In Fig. 1, reference numeral 1 denotes a cylindrical front axle, which is held at the lower part of the front of the tractor body, and projects outward from the front wheel differential carrier in pairs on the left and right, and a gear case 2 is attached to the outer end of the front axle 1. combined.

Reference numeral 3 denotes a pair of left and right differential yoke shafts, which are pivotally supported in the front axle 1, are interlocked by a front wheel differential device, and have a bevel pinion 4 at their outer ends.

5 is a bevel pinion shaft serving as a king pin, which is inserted into the gear case 2 in a vertical position, and a bevel pinion 4 is inserted in the middle of the shaft.
It has a bevel pinion 6 that meshes with.

Reference numeral 7 denotes a final reduction case, which is rotatable about the bevel pinion shaft 5 with respect to the gear case 2.

A front wheel hub axle 8 is supported in a horizontal position on the final reduction case 7 via bearings 9 and 10, and a reduction bevel gear 11 fixed to the hub axle 8 meshes with a bevel gear 6a fixed to the lower end of the bevel pinion shaft 5. ing.

A disc 12 is attached to the front wheel hub axle 8, and a front wheel 13 can be moved thereto.

As illustrated in FIG. 2, the following locking structure is provided between the inner race piece of the bearing 9 and the bevel gear 11 in order to receive the thrust force caused by the bevel gear 11.

In FIG. 2, reference numeral 14 denotes a circumferential groove having a semicircular cross section formed in the hub axle 8, and this circumferential groove 14 has a split mold divided into two or more parts, and a circular cross section protruding from the circumferential groove 14. A split collar 15 is fitted.

The depth of the circumferential groove 14 is approximately the same as the groove depth of the spline to which the bevel gear 11 is fixed.

A ring-shaped protrusion 16 having a square cross section is protruded from the end face of the boss portion 11a of the bevel gear 11 and is coaxial with the axis of the hub shaft 8. It is supported in a surrounding manner.

A thrust collar 17 is fitted between the split collar 15, the protrusion 16, and the inner race 9a, receives the inner race 9a, and opposes the thrust force of the bevel gear 11. inner lace 9
a and the end face of the boss portion 11a of the bevel gear 11,
The split collar 15 is held between the thrust collars 17 in the axial direction.

According to the invention devised as described above, when the rotational power generated by the engine (not shown) is transmitted to the front wheel differential device, the differential yoke shaft 3 is driven, and the bevel pinion shaft 5 and the front wheel hub shaft 8 are interlocked by the bevel gear reduction mechanism. and the front wheels 13 are driven.

At this time, the front wheel hub axle 8 receives thrust force from the bevel gear 11, but this is received by the cooperation of the split collar 15 and the thrust collar 17, and since the split collar 15 is locked in the circumferential groove 14, the hub axle 8 This prevents the shaft from moving, and also receives the thrust force from the front wheel 13 to prevent the inner race 9a from moving inward.

Even if the front wheel 13 is steered around the bevel pinion shaft 5 and a thrust force is applied thereto, it is similarly received, and even when bending from the front wheel 13 acts on the hub shaft 8, the hub shaft 8 Since the circumferential groove 14 has a semicircular cross section and stress concentration is small, cracks do not occur in the circumferential groove 14 even when subjected to repeated external forces, and fatigue strength can be improved.

The present invention is as described above, and compared to the conventional nut type, the overall length of the shaft can be shortened, and the case that supports the shaft internally can also be made compact, both of which have the advantage of being lightweight and inexpensive to manufacture. .

In addition, a split collar, rather than a simple collar, is fitted into the circumferential groove with a semicircular cross section provided around the shaft, so that the split collar can be easily fitted, and the split collar can be protruded from the end face of the boss portion of the bevel gear. Since the split collar is surrounded by the inner surface of the protrusion, there is no disassembly of the split collar, and the split collar can be held together with the assembly of the bevel gear, which has the advantage of facilitating assembly.

Furthermore, although the split collar fitted in the circumferential groove is held between the boss end face and the bearing via the thrust collar, the thrust force acting on the shaft is extremely simple. In addition to sufficiently catching and securing the shaft, since the circumferential groove is semicircular, it can sufficiently resist bending that acts on the shaft, and has the advantage of ensuring durability.

In addition, since the thrust collar is fitted between the bearing and the split collar on the shaft, even if there are manufacturing or assembly errors and the distance in the axial direction between the bearing and the end face of the boss part is not the specified value, it can be used as a thrust collar. By using a thickness that can absorb the above-mentioned error, the split collar can be reliably held between the bearing and the end face of the boss portion in the axial direction, and movement of the shaft in the axial direction can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention, and FIG. 2 is an enlarged view of a section taken in the direction of arrow a in FIG. 8... Front wheel hub axle, 9, 10... Bearing, 11... Bevel gear, 11a... Boss portion, 14... Circumferential groove ', 15... split collar, 16... protrusion.

Claims (1)

[Scope of utility model registration request] A rotary transmission shaft is supported in the case via a bearing, and a bevel gear whose boss end face faces the bearing in the axial direction is fitted onto the rotary transmission shaft so as not to be relatively rotatable. A circumferential groove with a semicircular cross section is formed in the circumferential groove, a split collar with a circular cross section that protrudes to the outside of the circumferential groove is fitted into the circumferential groove, and a protrusion surrounding the outer periphery of the split collar is formed into a projecting shape on the end face of the boss part. The invention is characterized in that a thrust collar is fitted between the bearing and the split collar on the rotating transmission shaft, and the split collar is held between the bearing and the end face of the boss portion in the axial direction via the thrust collar. Locking structure for axles, etc.