JPH0443621Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a half-split thrust bearing, and more specifically to a half-split thrust bearing that can prevent incorrect assembly.

"Prior Art" A half-split thrust bearing in the shape of a semicircular ring having an engaging pawl projecting radially outward on its outer circumferential surface is already well known.

FIG. 3 shows an example of such a half-split thrust bearing, and this semicircular ring-shaped half thrust bearing 21 has an engaging pawl 22 offset by a predetermined distance L from its circumferential center C. The protruding direction of the engaging pawl 22 is aligned with the center C of the half thrust bearing 21.
(Japanese Unexamined Patent Publication No. 53-20040).

Straight line Y connecting the above circumferential center C and center O
The engaging pawls 22 formed parallel to the radial direction of the half thrust bearing 21 are inclined with respect to the radial direction of the half thrust bearing 21, so when the half thrust bearing 21 is turned upside down, the engagement claws 22 cannot be engaged. The direction of inclination of the claws 22 is reversed.

Therefore, when the half thrust bearing 21 is mounted in the housing with the front side facing up, the engaging claw 22 can be smoothly engaged with the engaging portion 28 formed on the housing side parallel to the straight line Y (as shown in FIG. 3). However, when the half thrust bearing 21 is mounted in the opposite direction, the protruding direction of the engaging claw 22 and the forming direction of the engaging portion 28 do not coincide with each other as shown in FIG. 4.
This can prevent incorrect assembly.

``Problems to be solved by the invention'' By the way, when manufacturing half-split thrust bearings, in order to improve the yield of plate material, a large number of semi-circular ring-shaped halves are usually used, as will be detailed later. The thrust bearings are aligned in the same direction and are punched out with both ends slightly overlapping each other.

In this case, since there is a crescent-shaped surplus portion 23 between the inner peripheral surface of one adjacent half thrust bearing and the outer peripheral surface of the other half thrust bearing, the engaging claw 22 covers the surplus portion 22. It comes to be used and formed. In order to reliably prevent incorrect assembly, if the offset amount L of the engaging pawl is increased, the protrusion amount of the surplus portion 23 will be reduced since it is crescent-shaped.

As the amount of protrusion of the engaging claw 22 becomes smaller, the clearance δ in the width direction between the engaging claw 22 and the engaging portion 28 caused by manufacturing errors is large, as shown in FIG. There was a risk that the engaging claw 22 would be obliquely engaged within the engaging portion 28, resulting in incorrect assembly.

On the other hand, when the offset amount L is made smaller,
In other words, the engaging pawl 22 is divided in half into the thrust bearing 2.
1, the amount of protrusion of the engaging claw 22 can be increased, but when the half thrust bearing 21 is turned over, the direction in which the engaging portion 28 is formed and the protruding direction of the engaging claw 22 become similar to each other. For example, the engaging claw 22
If it is formed in the center portion C, the half thrust bearing 21 will have the same shape on its front and back surfaces,
Therefore, the engaging claw 22 is divided in half and the thrust bearing 21
Even if the amount of protrusion is increased by moving the half thrust bearing 21 closer to the circumferential center C, it becomes difficult to prevent incorrect assembly of the half thrust bearing 21.

As described above, in the conventional half-split thrust bearing 21 described above, there is a certain limit to the ability to reliably prevent incorrect assembly.

In view of such circumstances, the present invention provides a half-split thrust bearing that can reliably prevent incorrect assembly even if the above-mentioned surplus portion of the crescent moon is small.

``Means for Solving the Problems'' In other words, the present invention provides a half-split thrust bearing in the shape of a semicircular ring having engaging pawls that protrude radially outward on the outer circumferential surface. The engaging pawl is formed in a direction away from a line passing through the center of the half thrust bearing, and is oblique to a straight line connecting the center in the circumferential direction of the half thrust bearing.

"Operation" According to the above configuration, the engaging pawl is arranged in a direction away from a line passing through the center of the half-split thrust bearing.
Since it is formed diagonally with respect to the straight line connecting the circumferential center of the half-split thrust bearing and the center, when the half-split thrust bearing is turned upside down, the engagement claw The direction of inclination can be made significantly different.

Furthermore, by forming the engaging pawl in the above-mentioned inclined direction, the largest portion of the crescent-shaped surplus portion can be utilized, so the amount of protrusion of the engaging pawl can be made as large as possible. Coupled with the fact that the inclination directions of the engaging claws can be greatly different when the front and back sides are reversed as described above, incorrect assembly can be reliably prevented.

"Example" The present invention will be explained below with reference to the illustrated example.
In FIG. 1, a half-split thrust bearing 1 in the shape of a semicircular ring centered at a point O is provided with an engaging pawl 2 at a circumferentially central position on its outer circumferential surface.
This engaging pawl 2 protrudes outward in the radial direction of the half thrust bearing 1, and extends rightward with respect to a straight line Y connecting the circumferential center C and the center O of the half thrust bearing 1. It is formed diagonally.

Both ends of the thrust bearing 1 are butted against both ends of a half-split thrust bearing 3 having a semicircular ring shape to form a complete ring. A protrusion 4 is formed on the outer periphery of the end portion and protrudes in the circumferential direction beyond a straight line A cutout 5 matching the protrusion shape of the protrusion 4 is formed on the outer periphery of the end. At this time, the abutting surfaces of the protrusion 4 and the notch 5 are formed to cross the straight line X diagonally.

Further, a notch 6 is formed on the outer periphery of the other end of the thrust bearing 1 and is set back from the straight line X passing through the center O, and the notch 6 is formed on the outer periphery of the other end of the thrust bearing 3. In accordance with the shape of 6, a protrusion 7 is formed that protrudes from the straight line X in the circumferential direction.

The abutment surface between the notch 6 and the protrusion 7 is formed so as not to cross the straight line X, unlike the abutment surface between the protrusion 4 and the notch 5 described above. Even if two identical thrust bearings 3 are to be combined, the arrangement is such that they cannot be assembled together.

Furthermore, the above-mentioned pair of half-split thrust bearings 1 and 3
is designed to be incorporated into a housing (not shown), and the housing is formed with a groove-shaped inclined engagement portion 8 that matches the circumferential direction inclination of the engagement claw 2, as shown in phantom lines. has been done.

Therefore, if the front and back surfaces of the thrust bearing 1 are reversed when assembled into a housing, the direction of inclination of the engagement claws 2 will be opposite to the direction of inclination of the inclined engagement portions 8 formed in the housing. As a result, the thrust bearing 1 can always be assembled into the housing in a normal state.

When assembling the other thrust bearing 3 to the thrust bearing 1 assembled to the housing, if the front and back surfaces of the thrust bearing 3 are reversed, the protrusions at both ends of the thrust bearing 1 Since the relative positions of the notch 5 and the protrusion 7 that are assembled to the part 4 and the notch 6 are reversed, it becomes impossible to assemble them.

As a result, for the thrust bearing 1 that is properly assembled into the housing, the other thrust bearing 3
cannot be assembled unless it is in normal condition.
Therefore, both thrust bearings 1 and 3 can always be assembled in a normal state.

FIG. 2 shows a part of the manufacturing process of the half-split thrust bearing 1. As mentioned above, in order to improve the yield of the plate material 10, a large number of half-split thrust bearings 1 are arranged in the same direction. The punches are punched out in alignment and with both ends slightly overlapping each other. In this case, a crescent-shaped surplus portion 11 is formed between the inner peripheral surface of one adjacent half thrust bearing 1 and the outer peripheral surface of the other half thrust bearing 1, but the above-mentioned engaging claw 2 to thrust bearing 1
Since it is formed at the center position in the circumferential direction, it can be formed at the largest part of the crescent-shaped surplus portion 11, and therefore, it is possible to increase the amount of protrusion of the engaging claw 2 and avoid mistakes. The possibility of assembly can be eliminated.

In particular, in this embodiment in which the engaging claw 2 is formed so as to be inclined to the right, the engaging claw 2 is moved to the left side from the center position in the circumferential direction of the thrust bearing 1, as shown by the imaginary line in FIG. Even if the engaging claw 2 is formed offset from the crescent-shaped excess portion 11, the engagement claw 2 can be formed at the largest part of the crescent-shaped surplus portion 11. In particular, the tip of the engagement claw 2 can be formed at the top of the crescent-shaped surplus portion 11. The protrusion amount of the engaging claw 2 can be maximized at a position that matches the above.

On the other hand, if the engaging claw 2 is formed to be inclined to the right, the amount of protrusion will become smaller as it is offset to the right from the center position in the circumferential direction. There is a risk that this will occur.

The above explanation is for the case where the engaging claw 2 is formed to be inclined to the right, but when the engaging claw is formed to be inclined to the left, the engaging claw is formed to be inclined to the right from the center position in the circumferential direction. Even if it is formed offset, the erroneous engagement claw can be formed in the largest part of the crescent-shaped surplus part. To express this state comprehensively, as shown in FIG. It suffices if it is formed obliquely with respect to the straight line Y connecting the circumferential center portion C of No. 1 and the center O.

"Effect of the invention" As described above, in the present invention, the engaging pawl protrudes radially outward at approximately the circumferential center of the half-split thrust bearing, and passes through the center of the half-split thrust bearing. Since it is formed in the direction away from the radiation and diagonally to the straight line connecting the circumferential center of the half thrust bearing and the center, it is possible to reliably prevent incorrect assembly without reducing the yield of the plate material. The effect is that it can be prevented.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is a plan view showing the manufacturing process of the half-split thrust bearing 1 shown in Fig. 1, Fig. 3 is a plan view showing an example of a conventional device, and Fig. 4 is a plan view showing a state different from Fig. 3. . 1, 3... Half thrust bearing, 2... Engaging claw, 4, 7... Projection, 5, 6... Notch, 8...
... Inclined engagement part, 10 ... Plate material, 11 ... Surplus part, C ... Center part, O ... Center, Y ... Straight line,
Z... Radiation.

Claims (1)

[Scope of utility model registration request] In a semicircular ring-shaped half-split thrust bearing having a radially outwardly protruding engaging claw on the outer circumferential surface, the radially outwardly projecting engaging claw is connected to a line passing through the center of the half-split thrust bearing. A half-split thrust bearing, characterized in that the half-split thrust bearing is formed obliquely in a direction away from the straight line connecting the circumferential center of the half-split thrust bearing and the center.