JPH0623773Y2 - Split type rolling bearing device - Google Patents

Description

Detailed Description of the Invention a. Purpose of the Invention (Field of Industrial Application) The split type rolling bearing device according to the present invention is used, for example, when a crankshaft of an engine is rotatably supported with respect to a cylinder block.

(Prior Art) A cylinder block of an engine and a supporting shaft portion 3 of a crankshaft 2 as shown in FIG. 10 are coupled to each other via a slide bearing as shown in FIG. It is rotatably supported with respect to.

Between the inner peripheral surface of the housing portion 5 provided on the cylinder block and the outer peripheral surface of the support shaft portion 3, conventionally, by interposing bearing metal 6, 6, the support shaft portion 3 is
Although it is designed to rotate inside the housing portion 5, in recent years, in order to reduce the frictional resistance of each part of the engine, a bearing is provided between the inner peripheral surface of the housing portion 5 and the outer peripheral surface of the support shaft portion 3. Instead of the metals 6 and 6, rolling bearings are provided.

When the rolling bearing is provided in such a portion, it is impossible to fit the bearing from the end portion of the support shaft portion 3;
Use a split type rolling bearing as shown in the figure.

This split type rolling bearing uses the outer peripheral surface of the support shaft portion 3 as a raceway surface, and has a plurality of rollers 7, 7 arranged around the support shaft portion 3 and a pair of semi-circular arcs. Shaped dividing element 8
A cylindrical shape is formed by combining a and 8b, and is composed of an outer ring 9 that surrounds the plurality of rollers 7 and 7, and is held inside a split-type housing portion 5 provided in the cylinder block.

One of the pair of splitting elements 8a and 8b
A small hole 10 is formed on the lower surface of b, and when the rolling bearing is mounted on the housing part 5, the pin 11 protruding from the inner peripheral surface of the housing part 5 is provided with the small hole 10 as shown in FIGS. The outer ring 9 is prevented from rotating inside the housing portion 5 by fitting the outer ring 9 into the housing 10.

(Problems to be Solved by the Invention) However, when the split type rolling bearing is mounted on the support shaft portion 3 of the crankshaft 2 as described above, the following inconvenience occurs.

That is, since the total length L of the support shaft portion 3 is slightly larger than the width W of each of the dividing elements 8a and 8b (L> W), the dividing elements 8a and 8b to be combined with each other are as shown in FIG. , The outer ring 9 is likely to shift in the width direction.

In this way, when the dividing elements 8a and 8b are displaced in the width direction,
The side surface of the balancer of the crankshaft 2 and the outer ring 9 rub against each other, causing galling and abnormal wear. Further, a step is formed on the collars formed at both ends of the inner peripheral surfaces of the split elements 8a and 8b, which causes poor rolling of the rollers 7 and 7, which may cause early failure of the rollers 7 and 7.

The split type rolling bearing device of the present invention eliminates the above-mentioned inconvenience.

b. Configuration of the Invention (Means for Solving the Problem) The split type rolling bearing device of the present invention, like the above-mentioned conventional bearing device, has a shaft having an outer peripheral surface as a raceway surface and is arranged around this shaft. A plurality of rolling elements and a semi-circular dividing element are combined to form a cylindrical shape, and an outer ring surrounding the rolling element and a split type housing for holding and fixing the outer ring inside are formed. There is.

Further, in the split type rolling bearing device of the present invention, a notch is formed at the circumferential end edge of the split element and at a position aligned with each other at the time of assembly so that the outer ring is provided on the outer ring when both split elements are assembled. A notch is freely formed, and at least one of a pair of protrusions formed at a distance from each other is inserted into the notch at an end edge of a locking plate sandwiched and fixed between the housings. The one projection piece and the other projection piece suppress the mating portion of the split elements forming the outer ring from both sides.

(Operation) In the split type rolling bearing device of the present invention configured as described above, the pair of projecting pieces formed on the locking plate are provided with the mating portions of the pair of split elements which are combined with each other from both sides. Since it is suppressed, both split elements do not shift in the width direction.

Further, the rotation of the outer ring with respect to the housing is prevented by the engagement of the protrusion and the notch.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

FIG. 1 is a longitudinal sectional view showing a state where the split type rolling bearing device of the present invention is mounted between a cylinder block and a support shaft portion of a crankshaft, and FIG. 2 is a sectional view taken along the line AA of FIG.
3 is a perspective view showing a state in which the rolling bearing is assembled, FIG. 4 is a perspective view of a locking plate, FIG. 5 is a perspective view of a butting portion of a split element, and FIG. 6 is a sectional view of the split element. is there.

Around the support shaft portion 3 formed in the middle portion of the crankshaft 2, a two-divided retainer 12 holds the shaft.
A plurality of rollers 7, 7 which are rolling elements are arranged. The outer ring 9 surrounding the plurality of rollers 7, 7 has a cylindrical shape by combining the semi-circular dividing elements 8a, 8b, and the sectional shape of each dividing element 8a, 8b is as shown in FIG. In, the central portion of the inner peripheral surface is a vertically elongated U-shaped shape, the recessed portion,
The raceway 13 is in contact with the outer peripheral portions of the rollers 7, 7.

Also, on the crankshaft support of the cylinder block,
A split type housing portion 5 for holding and fixing the outer ring 9 inside is formed. The housing part 5 includes a semicircular arc-shaped recess 14 formed on the lower surface of the main body of the cylinder block, and two bolts 15 and 1 at the lower end of the main body.
It is composed of a holding lid 16 which is connected and fixed by 5.

The above-mentioned structure is the same as that of the conventional split type rolling bearing device shown in FIGS. 9 to 12, but in the split type rolling bearing device of the present invention, a pair of outer rings 9 is formed. 5, the notches 17 and 17 as shown in FIG. 5 are formed at both corners of the circumferential edges of the dividing elements 8a and 8b, and at positions where they are aligned with each other at the time of combination. Sometimes, at the four axial end edge positions of the outer ring 9,
The U-shaped notches 18 and 18 are formed.

The operation of forming such a pair of dividing elements 8a and 8b is performed by forming the notches 18 and 18 in a predetermined portion of the cylindrical outer ring 9 and then applying an impact to the notch forming portion. 18, 1
This can be easily performed by generating a crack from the inner part of 8 toward the other notch 18, 18.

On the other hand, between the lower surface of the main body portion of the cylinder block forming the housing portion 5 and the upper surface of the holding lid body 16,
Locking plates 19, 19 as shown in FIG. 4 are clamped and fixed.

Each of the locking plates 19 and 19 has a pair of protrusions 20 and 20 which are spaced from each other at their end edges and are formed at intervals l corresponding to the intervals l of the cuts 18 and 18. However, each cut 1
The lengths of 8 and 18 do not reach the track 13 of the inner peripheral surface of the outer ring 9.

The projecting piece 2 of the pair of locking plates 19 and 19 formed as described above and sandwiched and fixed between the lower surface of the main body of the cylinder block forming the housing portion 5 and the upper surface of the holding lid 16.
As shown in FIGS. 1 and 2, 0 and 20 are inserted into the notches 18 and 18 of the outer ring 9 which are held between the lower surface of the main body of the cylinder block and the upper surface of the restraining lid 16, and the protrusions Pieces 20, 2
With 0, the butting portions of the split elements 8a, 8a that form the outer ring 9 are suppressed from both sides.

In the split type rolling bearing device of the present invention configured as described above, the pair of projecting pieces 2 formed on the respective locking plates 19 and 19 are provided.
0, 20 is a pair of splitting elements 8 combined with each other
Since the a butted portions of a and 8b are suppressed from both sides, the split elements 8a and 8b do not shift in the width direction as shown in FIG.

Further, the rotation of the outer ring 9 with respect to the housing portion 5 is prevented by the engagement of the protrusions 20, 20 with the notches 18, 18 formed by the notches 17, 17.

As shown in FIG. 7, the width of the protrusions 20, 20 formed on each locking plate 19 is wide at the base end portion and narrow at the tip end portion, so that the distance between the protrusions 20, 20 is large. The projecting pieces 20, 20
If it becomes shorter toward the base end of the
When inserting the outer ring 9 into the notches 18, 18,
The part located between 18 bites into the part between both projecting pieces 20, 20 in a wedge shape, and the positioning of the pair of dividing elements 8a, 8b in the width direction can be reliably performed. In this case, the outer edge (the right edge in FIG. 7) of the locking plate 19 projects laterally from the housing portion 5,
If the projecting portion is pressed inward as shown by the arrow in FIG. 7 while the rolling bearing is assembled,
It is possible to reliably prevent the pair of splitting elements 8a and 8b from shifting in the width direction.

Furthermore, a pair of projecting pieces 20, at the edge of each locking plate 19,
The portion located between 20 is freely contactable with the end edges of the split elements 8a, 8b, and the locking plates 19, 19 are abutted against the end edges of the split elements 8a, 8b, while rolling bearings are provided. If the assembling work is performed, the outer peripheral surfaces of the dividing elements 8a and 8b can be made to coincide with each other, and the dividing elements 8a and 8b can be prevented from being displaced as exaggeratedly shown in FIG.

In the above-described embodiment, the rollers 7, 7 are directly brought into contact with the support shaft portion 3 of the crankshaft 2, but the outer peripheral surface of the support shaft portion 3 may be a bearing ring or the like if necessary. You can cover it. Further, the plurality of rolling elements provided between the support shaft portion 3 and the outer ring 9 may be needles or balls depending on the place of use. Further, the shape of the back end of the cut 18 is not limited to the arc shape,
It may be flat or V-shaped.

c. Effect of the Invention Since the split type rolling bearing device of the present invention is configured and operates as described above,
Even if the member for mounting the split type rolling bearing device is not subjected to troublesome processing such as forming a concave hole, the positioning of both split elements can be reliably performed when the split elements forming the outer ring are combined. Therefore, without increasing the production cost,
It is possible to reliably prevent the malfunction of the bearing device due to the positioning error of the split element.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a state where the split type rolling bearing device of the present invention is mounted between a Linda block and a support shaft portion of a crankshaft, and FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a perspective view showing a state in which the rolling bearing is assembled, and FIG.
FIG. 5 is a perspective view of the locking plate, FIG. 5 is a perspective view of a butting portion of the split element, FIG. 6 is a sectional view of the split element, and FIG. 7 is a right side of FIG. 2 showing another example of the locking plate. 8 is a schematic side view showing a state in which the dividing elements are displaced in the diametrical direction in an exaggerated manner.
FIG. 10 is a perspective view showing a conventional bearing portion, FIG. 10 is a side view showing a support shaft portion of a crankshaft, FIG. 11 is a perspective view of a split type rolling bearing, and FIG. 12 shows an assembled state of this rolling bearing. The side view shown in FIG. 13 and FIG. 13 are sectional views showing a state in which the split elements constituting this rolling bearing are displaced in the width direction. 1: Piston, 2: Crank shaft, 3: Support shaft part,
5: housing part, 6: bearing metal, 7: roller, 8
a, 8b: splitting element, 9: outer ring, 10: small hole, 11: pin, 12: retainer, 13: track, 14: recess, 15: bolt, 16: restraining lid, 17: notch, 18: Notch,
19: locking plate, 20: protrusion.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A shaft having an outer peripheral surface as a raceway surface, a plurality of rolling elements arranged around the shaft, and a semi-circular dividing element are combined to form a cylindrical shape. In a split type rolling bearing device comprising an outer ring surrounding the periphery and a split type housing for holding and fixing the outer ring inside, at a circumferential end edge of the split element and at a position aligned with each other when assembled. A notch is formed so that when the two split elements are combined, a cut can be formed in the outer ring, and a pair of projecting pieces formed at a distance from each other are formed on the edges of the locking plate that is sandwiched and fixed between the housings. At least one of the projecting pieces inside is inserted into the above-mentioned notch, and the mating portion of the splitting elements that form the outer ring with this one projecting piece and the other projecting piece is suppressed from both sides. Bearing device.