JPS5926621A - Fixing device of bearing - Google Patents

Abstract

PURPOSE:To obtain a fixing ring which is unnecessary to deform elastically, by a method wherein the ring is divided into two parts in a diametral direction and hookform parts engaging with each other are provided on corresponding end parts of the divided parts of the ring. CONSTITUTION:Two divided parts 15 and 16 of a ring are manufactured by dividing the ring into two parts in a diametral direction. Hookform parts 17 and 18 and 17' and 18' connecting with each other are provided on corresponding end parts 15a and 16a and 15b and 16b of both the divided parts 15 and 16 of the ring respectively so that these divided parts 15 and 16 of the ring are unable to separate in the diametral direction. At the time of fixing of a bearing, both the divided parts 15 and 16 of the ring are provided in an external circumferential stripe groove 2a having a width of more than two times of a thickness of a plate of the ring 14 by shifting the parts 15 and 16 in an axial direction. After the above process, both the divided parts of the ring are made to move in the axial direction relatively and hookform parts 17 and 18 and 17' and 18' are made to connect with each other. The bearing is fitted over a shaft 2 under this state and a snap ring 13 is connected with an external circumferential stripe groove 2b in the final stage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing fixing device for fixing a bearing on a shaft in the axial direction.

This type of bearing fixing device is conventionally constructed with a ring called a snap ring, and the snap ring is usually engaged with a circumferential groove of a shaft to fix the bearing on the shaft in the axial direction.

An example of its application will be explained in the case of a rack-and-pinion type steering gear shown in Fig. 1. In Fig. 1, 1 is a gear hawing, 2 is a pinion shaft, 8 is a pinion formed on the pinion shaft 2, and 4 is meshed with the pinion 8. The rack 5 is a retainer, 6 is a spring, 7 is an adjuster, and 8 is a lock nut. meshes with each other to provide preload. The pinion shaft 2 is rotatably supported with respect to the housing l by a bushing 9 at one end and a bearing 10 near the other end, and when the pinion 8 is rotated via the pinion shaft 2 by steering operation of the steering wheel, the rack 4 can move in the corresponding axial direction to turn the steering wheels of the vehicle in a predetermined manner.

The bearing 10 has its outer race axially fixed in the housing 1 by a snap ring 1 which is engaged within the housing 1, and the inner race is fixed to the pinion shaft 2 by a snap ring 12 and 18 which is engaged with the pinion shaft 2. It is fixed in the axial direction, and as a result, the binion shaft 2 can be fixed in the axial direction with respect to the housing l.

By the way, in the conventional bearing fixing device for fixing the bearing 1o on the pinion shaft 2 in the axial direction, the outer circumferential groove 2a of the pinion shaft 2 is enlarged and clearly shown in FIG.
, 2b, and in order to sandwich the bearing 10 between these snap rings, both snap rings 12 and 18 are engaged with the outer circumferential grooves 2a and 2b so that they are radially outward. It is necessary to extend the elastically expanded state to the corresponding outer circumferential grooves 2a and 2b in the axial direction.Therefore, the snap rings 12 and 18 have a plate thickness t (snap (only the snap ring 12 is shown) and the width W (only the snap ring 12 is shown) cannot be made too large.

For this reason, the strength of the snap ring 12.18 can be ensured to a certain extent, but when a large thrust force is applied to the binion shaft 2, there is a risk that the snap ring 12.18° will be damaged and serious trouble will occur. was there.

In particular, the snap ring 12 adjacent to the pinion 8 is connected to the side wall of the outer circumferential groove 2a when the gear specifications of the steering gear are changed and the tip circle diameter A of the pinion 8 is reduced as shown in FIG. It is necessary to reduce the diameter of the bottom wall of the outer circumferential groove 2a in order to keep the run-off allowance B as specified, but in this case, the run-off allowance d with the bearing 10 decreases, which also makes the bearing more susceptible to damage. The lO may even come off in the axial direction, resulting in a lack of bearing fixing ability.

The present invention provides a bearing fixing ring that can be attached to the outer circumferential groove of the shaft without expanding in the radial direction like a snap ring, so that the plate thickness and width of the ring can be sufficiently reduced without the above-mentioned restrictions. The bearing fixing device of the present invention is a concrete embodiment of this idea from the viewpoint that it can be made larger and can solve all the problems mentioned above. A hook-shaped portion is provided in each of the sections to engage with each other so that when the two ring divided portions are moved relative to each other in the axial direction and aligned in a plane perpendicular to the axis, the two ring divided portions cannot be separated in the radial direction. It is characterized by this.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 4 shows an example of the ring 14 used in the bearing fixing device of the present invention. In the present invention, the ring 14 is divided into two parts in the radial direction and constituted by two ring division parts 15 and 16. And the corresponding ends 11sa of both ring division parts 15.16
, 16a and 11Sb 16b are provided with hook-shaped portions 17.18 and 17', 18', respectively, which engage with each other so that the two ring parts 15.16 cannot be separated in the radial direction.

It should be noted that the hook-shaped portions 17, 18, 17', 18' may have any shape as long as they engage with each other so as to meet the above requirements. However, both ring division parts 15
．． 16 of the mutually non-engaging hook-shaped portions 17, 17' and 18, 18', respectively, are connected to the ring 14 as shown in the illustration.
If the shape is point symmetrical with respect to the center 0, the hooked part 17:1
8' has a position and shape corresponding to the hook-shaped portions 17 and 18, so that the ring division part 16 can be made into a part exactly the same as the ring division part 15, and both ring division parts 15 and 16
can be made common, can be manufactured at low cost, and can be easily managed.

Shirt) Z by the apparatus of the present invention using such a ring 14
When fixing the bearing on the top, first, as shown in FIG. .16 is installed with the position shifted in the axial direction. Then, the inner circumferential surface 15o, 1 of both ring divided portions 1 [S, 16
6o is in contact with the bottom wall of the outer circumferential groove 2a, both ring divided portions 15 and 16 are respectively attached to the corresponding hook-shaped portions 1 as shown in Figure @6. , 18 and 17', 18' are rotationally positioned so that they are axially aligned with each other. Thereafter, both ring segments 15.16 are moved relative to each other in the axial direction so that they are aligned in a plane perpendicular to the axis, so that the corresponding barbs 17.18 and 1
7' and 18' are engaged with each other as shown in FIG. 4(,).

In this state, as shown in FIG.
1 (ring 141) on the outer circumference #2 near the binion 8
The bearing 10 is fitted onto the shaft Z to press it against the side wall 2a' of the shaft Z, and finally the snap ring 18 is engaged with the outer circumferential groove 2b, and the bearing 10 is attached to the ring 14 and the snap ring 1B.
to fix it on shaft B.

The device of the present invention for fixing the bearing 10 as described above divides the ring 14 into two in the radial direction, and the corresponding ends 15a, 16a and 15b, 1 of both ring divided portions 15.16.
6b, hook-shaped portions 1 that engage with each other so that the two ring divided portions cannot be separated in the radial direction when the two ring divided portions are relatively moved in the axial direction and aligned in a plane perpendicular to the axis.
7, 18, and 17', 18', ring 1
There is no need for any elastic deformation when the ring 4 is attached to the two outer circumferential grooves of the shaft 2, and the width and thickness of the ring 14 can be increased without being subject to restrictions such as thickness, thereby increasing its strength. In addition, it is possible to sufficiently increase the amount of contact with the bearing 10, and improve the bearing fixing ability.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of a rack-and-binion type steering gear equipped with a conventional bearing fixing device, Figure 2 is an enlarged cross-sectional view of its main parts, and Figure 8 is a conventional type when the pinion tip diameter is small. FIG. 4(-) is a front view of the ring used in the bearing fixing device of the present invention; FIG. 5 and 6 are explanatory views of the assembly procedure of the bearing fixing device of the present invention, and FIG. 7 is a longitudinal sectional side view of the bearing fixing device of the present invention. 2... Pinion shaft (shaft), 2a... Outer circumferential groove, 10... Bearing, 18... Snap ring,
14...Ring, 15.16...Ring division part, 15a, 16a, 15b, tab/one corresponding end, 1?
, 17', 18.18'... hook, 0... ring center. Patent applicant Nissan Motor Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 7

Claims (1)

[Scope of Claims] 1. A device for axially fixing a bearing on a shaft by a ring engaged in an outer circumferential groove of the shaft,
When the ring is divided into two parts in the radial direction and the corresponding ends of both ring division parts are moved relative to each other in the axial direction to align them in a plane perpendicular to the axis, both ring division parts are radially 1. A bearing fixing device characterized by having hook-shaped portions that engage with each other so that they cannot be separated in any direction. 2. The bearing fixing device according to claim 1, wherein the hook-like portions of both ring division portions that do not engage with each other have shapes that are point symmetrical with respect to the center of the ring.