JPH0556404B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting structure for a half-split thrust bearing.

[Prior art and problems]

Generally, when a half-split thrust bearing consisting of a pair of semicircular ring-shaped thrust washers is installed at the ends of a pair of shaft holding members, the ends of both shaft holding members are provided with a A semicircular ring groove is provided along the opening of each shaft insertion hole. Since a pair of conventional thrust washers have the same wall thickness, when both thrust washers are installed in both semicircular ring grooves, there is a risk that the thrust washers may rotate around the axis within the semicircular ring grooves. . Therefore, in order to prevent the rotation of the thrust washer, as shown in FIGS. 5 and 6, one thrust washer 1 is provided with a pawl 2 that protrudes radially outward, and a corresponding shaft holding member 3 is provided on one thrust washer 1.
A structure in which a recess 4 for receiving the claw 2 is provided is widely adopted.

In the case of such a mounting structure for a half-split thrust bearing, the semicircular ring groove 5 and the recess 4 in the shaft holding member 3 cannot be machined at the same time, so the recess 4 and the semicircular ring groove 5 are It becomes difficult to finish with depth. If the recess 4 is shallower than the semicircular ring groove 5, the thrust washer 1 will float above the semicircular ring groove 5, so normally the recess 4 is shallower than the semicircular ring groove 5.
Processed to be deeper than Therefore, as shown in FIG. 7, a gap is created between the thrust washer 1 and the shaft holding member 3 at the location of the recess 4. In the case of such a structure, if repeated loads are applied to the thrust washer 1, the thrust washer 1 will become fatigued at the gap and may break.

On the other hand, conventionally, in order to stop the rotation of a pair of thrust washers 6, 6, and 6 of the same thickness, as shown in FIGS. 8 and 9, a pair of thrust washers 6,
A mounting structure for a half-split thrust bearing is known in which a knock pin hole 8 is provided in at least one of the shaft bearings 7 and the knock pin passed through the knock pin hole 8 is driven into the knock pin hole of the shaft holding member. However, in the case of this structure, there are problems in that the strength of the thrust washer is reduced due to the notch holes, the number of parts and the number of processing steps are increased, and high accuracy is required for positioning the dowel pin holes in the thrust washer and the shaft holding member.

[Means for solving problems]

In view of the above problems, the present invention can prevent a pair of thrust washers from rotating, and
To provide a mounting structure for a half-split type thrust bearing that is easy to process and has no risk of deterioration in strength.

That is, according to the present invention, shaft insertion holes are provided in the matching portions of the pair of shaft holding members, and semicircular ring grooves are provided in the end faces of both shaft holding members along the openings of the shaft insertion holes, and the pair In the mounting structure of the half-split thrust bearing, in which a half-split thrust bearing consisting of a semicircular ring-shaped thrust washer is fitted into the semicircular ring groove, the wall thicknesses of the two thrust washers are made different from each other, and There is provided a mounting structure for a half-split thrust bearing, characterized in that the depths of the semicircular ring grooves are different from each other by the difference in wall thickness of the thrust washers.

[Effect]

According to the above means, both end portions of the thick thrust washer come into contact with the stepped portions of the semicircular ring grooves of both shaft holding members, so that rotation of both thrust washers is prevented. Since the difference in wall thickness between both thrust washers and the difference in depth between both semicircular ring grooves is equal,
There is no difference in level between the thrust surfaces of both thrust washers. The end faces of both thrust washers opposite to the thrust surface are fully in close contact with the bottom of the semicircular ring grooves of both shaft holding members, and since there are no holes etc. in the thrust washers, a decrease in the strength of the thrust washers is prevented. be done. Since the thrust washer is not provided with claws or the like, the material yield is improved. Since both thrust washers have different wall thicknesses, if they are incorrectly installed in semicircular ring grooves with different depths, a step will be created on the thrust surfaces of both thrust washers, making it easy to detect the incorrect insertion. Therefore, incorrect insertion of the thrust washer can be easily prevented. Since there is no need to machine holes for dowel pins or the like in the thrust washer or shaft holding member, the number of machining steps is reduced.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4 of the drawings.

FIGS. 1 and 2 show a thrust bearing structure in which the present invention is applied to a crankshaft holding portion of an engine. Referring to these figures, a shaft insertion hole 13 is formed in a matching portion between the engine block 11 and a bearing cap 12 attached to the engine block 11. Shaft insertion hole 1
Vertically divided bearing metals 14 and 15 are mounted on the inner surfaces of the bearings 3, and a crankshaft (not shown) is rotatably held inside the bearing metals 14 and 15. Semicircular ring grooves 16 and 17 are provided on the end surfaces of the engine block 11 and the bearing cap 12, respectively, along the opening of the shaft insertion hole 13. As shown in FIGS. 2 and 3, the half-split thrust bearing 18 consists of a pair of semicircular ring-shaped thrust washers 19 and 20. Both thrust washers 19, 20 are mounted in both semicircular ring grooves 16, 17, respectively.

As shown in FIGS. 1 and 4, both thrust washers 19 and 20 have different wall thicknesses T ₁ and T _{2 .}
(T ₁ >T ₂ ). Also, the depths D ₁ and D ₂ of both semicircular ring grooves 16 and 17 are the same as those of the thrust washer 1.
9 and 20 ( _{D 1 > D 2 )} . Thrust washer 19,
The wall thicknesses T ₁ and T ₂ of the grooves 20 are larger than the depths D ₁ and D ₂ of the corresponding semicircular ring grooves 16 and 17, respectively (T ₁
>D ₁ , T ₂ >D ₂ ).

In the half-split thrust bearing mounting structure configured as described above, both ends of the thick thrust washer 19 have both semicircular ring grooves 1 as shown in FIG.
Since the thrust washer 19 comes into contact with the stepped portions 6 and 17, the thrust washer 19 is prevented from rotating by both stepped portions. Therefore, the thrust washer 20 having a small wall thickness is prevented from rotating while being in contact with both ends of the thrust washer 19.

Since the difference in wall thickness between both thrust washers 19 and 20 and the difference in depth between both semicircular ring grooves 16 and 17 are equal, no step is generated on the thrust surfaces of both thrust washers 19 and 20. The end surfaces of both thrust washers 19 and 20 opposite to the thrust surfaces are in close contact with the bottom surfaces of both semicircular ring grooves 16 and 17 over the entire surface, and since no holes etc. are provided in thrust washers 19 and 20, the thrust washers 1
9, 20 is prevented from decreasing in strength. Since the thrust washers 19 and 20 are not provided with claws or the like, the material yield is improved.

Since both thrust washers 19 and 20 have different wall thicknesses, if they are installed in the semicircular ring grooves 16 and 17 of different depths by mistake, both thrust washers 1
A step is created on the thrust surfaces 9 and 20. Therefore, mistakes in insertion can be easily discovered. Since it is not necessary to machine holes for dowel pins, etc. in the thrust washers 19, 20, engine block 11, bearing cap 12, etc., the number of machining steps is reduced.

The thrust washers 19 and 20 can be made by stamping, but they can also be made by bending a material.

Although one embodiment has been described above, the present invention is not limited to the embodiment described above, and various changes can be made to its constituent elements within the scope of the invention described in the claims. . Also,
The present invention can be similarly applied to a thrust bearing of a crankshaft in a connecting rod of an engine, and can also be applied to any other thrust bearing.

〔Effect of the invention〕

As is clear from the above description, the present invention provides a mounting structure for a half-split thrust bearing that can prevent a pair of thrust washers from rotating, is easy to process, and has no risk of deterioration in strength. can do.

[Brief explanation of drawings]

1 is a sectional view taken along the line - in FIG. 2 of a mounting structure for a half-split type thrust bearing showing an embodiment of the present invention; FIG. 2 is a front view of the thrust bearing mounting structure shown in FIG. 1; Fig. 3 is an exploded front view of the half-split thrust bearing shown in Fig. 1, Fig. 4 is a split side view of the half-split thrust bearing shown in Fig. 3, and Fig. 5 is the mounting structure of a conventional half-split thrust bearing. FIG. 6 is a sectional view taken along the line in FIG. 6 showing the thrust bearing mounting structure shown in FIG. 5, and FIG. 7 is a sectional view taken along the line in FIG. Fig. 8 is an exploded front view showing the structure of another conventional half-split thrust bearing, and Fig. 9 is an exploded view of the half-split thrust bearing shown in Fig. 8. FIG. 11...Engine block (shaft holding member), 1
2...Bearing cap (shaft holding member), 13
...Shaft insertion hole, 16, 17...Semicircular ring groove, 1
8... Half type thrust bearing, 19, 20... Thrust washer.

Claims (1)

[Claims] 1 A shaft insertion hole is provided in the matching portion of the pair of shaft holding members, semicircular ring grooves are provided in the end faces of both shaft holding members along the openings of the shaft insertion holes, and a pair of semicircular ring-shaped thrust washers are provided. In the mounting structure of the half-split thrust bearing, in which the half-split thrust bearing is fitted into the semicircular ring groove, the wall thicknesses of both the thrust washers are different from each other, and the depth of both the semicircular ring grooves is different from each other. A mounting structure for a half-split thrust bearing, characterized in that the thrust washers are different from each other by a difference in wall thickness.