JPS63203912A - Half-divided bearing with flange - Google Patents

Abstract

PURPOSE:To prevent any abnormal friction and seizure by forming the outer surfaces or the inner surfaces of flange portions in taper forms so as to get rid of local contact even through shaping and processing accuracy are inferior. CONSTITUTION:Thrust bearing surfaces 10b' or the back faces 10b'' of both flange portions 10b are formed in such a way to be upward and enlarge in taper forms. Therefore both surfaces of flange portions 10b, namely, the thrust bearing surfaces 10b' or the back faces 10b'' of the bearing surfaces 10b' enlarge toward up the ends. With this arrangement, even though an opposed inner surface 7a of a crankshaft is processed in taper form, regardless of its taper, a half-divided bearing can slide in such a way that all surfaces are brought into contact with the opposed inner surface 7a. Accordingly, the thrust bearing surfaces 10b' interface with the opposed inner surface 7a so as to be brought into contact with the opposed inner surface 7a so that any abnormal friction and seizure and the like can be prevented.

Description

[Detailed Description of the Invention] <Object of the Invention> Industrial Application Field The present invention relates to a flange half bearing, and more specifically, for example, to an assembly part of a flange half bearing in a power conversion mechanism such as a crankshaft. This invention relates to a half-split bearing with a flange, which can be assembled satisfactorily even if its external shape and processing accuracy are poor, and does not cause defects such as seizure or fatigue.

Conventional technology Traditionally, in power machines such as automobile engines, pumps, and pressure Ii1 machines, power is transmitted by converting the linear motion of pistons and other devices into rotary motion, or conversely, by converting rotary motion into linear motion. For example, a crankshaft 1 shown in FIG. 3 is used as one of the mechanisms for transmitting power by converting it into motion.

Normally, as shown in FIG. 3, a flange half bearing is attached to a journal 5 between the crankshaft 1 and the crank arm 1. However, in a crankshaft having such a complicated shape, the journal portion 5, that is,
It is extremely difficult to mass-produce the counterweight 81s7 that comes into contact with the flange 81Scb of the flange half bearing 6 assembled to the journal 8IS5 with high precision, and the crankshaft has poor processing precision. In conventional half-split bearings, contact failure occurs, and strong contact occurs locally, resulting in problems such as seizure and poor lubrication.

That is, as shown in FIGS. 3 and 5, the surface of the journal portion 5 functions as a radial rotation bearing surface 6a, while the half bearings 6 on the opposing inner surfaces 7a of the counterweights 7 on both sides function as a radial rotation bearing surface 6a. It functions as a thrust bearing surface (3b') in response to the thrust load applied to the flange 6b.To explain in more detail, the half bearing 6 has a semicircularly bent surface as shown in FIGS. 4(a) and (b'l). The journal part 5 is supported by the radial bearing surface 6a on the inner surface of the mouth bearing part 6a. The thrust load is supported by the thrust bearing surface 6b' on the outside of the flange 6b.For this reason, even if the shape and accuracy of the half bearing are improved, the crank shirt (~10 relative to the rotating surface 5a) If the shape and precision of the opposing inner surface 7a are not improved, variations will occur in the contact between the two wheel bearing surfaces 6b' and the opposing inner surface 7a, resulting in strong local contact and abnormal friction.More details To explain, the inner surface 7a of the crankshaft 1 facing the rotating shaft 5 is ground and flattened by a grindstone 9, as shown in FIG. As it advances, the tip 9a of the whetstone 9
is worn into a tapered shape (taper angle θ), and the opposing inner surface 7a ground by this tapered tip 9a becomes tapered. Therefore, when the half bearing 6 shown in FIGS. 4(a) and 4(b) is assembled to the tapered opposing inner surface 7a,
As shown in FIG. 5, the thrust/bearing surface 6b' of the bearing 6
A gap is created between the bearing and the opposing inner surface 7a of the crankshaft 1, and the contact is localized and poor, resulting in problems such as seizure and fatigue of the bearing.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned drawbacks, and specifically, it is possible to assemble the crank shirt i etc. well despite its poor shape and processing accuracy. We propose a half-split bearing with a flange that prevents each bearing surface from touching locally.

<Structure of the Invention> Means for solving the problem and its operation, that is, the bearing according to the present invention is incorporated in a power conversion mechanism such as a crankshaft, and has a main body portion in which the shaft portion of the mouth mechanism is curved in an arc shape. In the flanged half bearing, which supports the thrust part of the mechanism by flanges provided on both side edges of the main body, at least one of the outer surface of the flanges or the back surface thereof is configured in a tapered shape. At the same time, the thickness of the flange portion is increased toward the upper end.

Therefore, the structure and operation of these means will be specifically explained with reference to the drawings as follows.

Note that FIGS. 1(a) and (11) are cross-sectional views of a half bearing with a flange according to an embodiment of the present invention, and FIG. 2 shows how these half bearings are assembled to a crankshaft. FIG.

First, in FIG. 1 (a'+ and fb), the symbol 1
0 shows the cross-sectional structure of a half-split bearing with a flange according to one embodiment of the present invention. These half bearings 10 are used in combination as a pair, and the two half bearings 10 are assembled in the shaft portion of the crankshaft so as to surround the main shaft 5, and furthermore, the flange of these bearings 10 is A housing 8 is assembled between the bearings 10b as shown in FIG. 2 (however, only one half bearing 10 is shown in FIG. 2). That is, the half bearing 10 extends from both ends of the radial bearing part 10a bent in a semicircular shape to the flange part 1 as in the conventional example.
0b, an oil groove 10c is formed in the inner surface of the main body portion 10a in the circumferential direction, and a sleeve hole is formed to pass through a part of this oil groove.

Therefore, this oil groove 100 is located in the sleeve hole 2 of the crankshaft 1.
The lubricating oil supplied from this sleeve hole 2 is connected to the oil groove 10.
It enters the sleeve hole from c and circulates the lubricating oil. Both flange parts 10b
The outer thrust bearing surface 10b' supports the thrust load of the opposing inner surface 7a of the crankshaft 1.

Therefore, in the half bearing 10 having the configuration F, both the flange portions 10b
thrust bearing surface 10b' or its rear surface 101)''
is formed by expanding it in an upwardly tapered shape as shown in FIGS. 〜 is expanded toward the upper end in a tapered shape.When configured like a mouth, the crankshaft 1
Even if the facing inner surface 7a of the half bearing 10 is machined into a tapered shape, the half bearing 10 can be opened so that the entire surface is in contact with the half bearing 10 regardless of the taper.

That is, when assembling a flanged half bearing, as shown in FIG. 2, since the half bearing is fixed by the housing 8, the outer thrust bearing surface 10b' expands outward and faces the crankshaft. Closely adheres to the inner surface 1a. In other words, even if the pair of opposing inner surfaces 7a, 7a are configured in a tapered shape as described above, in the half bearing 10, the flange portion 10b expands in a tapered shape toward the upper end. The thrust bearing surface 10b' is the opposing inner surface 1a.
It aligns with the surface and hits the entire surface, maintaining good lubrication.

Further, when the thrust bearing surface 10b' or the back surface 10b'' is configured to be enlarged into a tapered shape, it is preferable that the taper angles of both the flange portions 10b are configured to have the same value.

When the corresponding taper angle of the opposing inner surface 7a is different, it can also be made different accordingly.

<Effects of the Invention> As explained in detail above, in the flanged half bearing according to the present invention, the shaft of the crankshaft or the like is supported by the arc-shaped main body, and the flanges attached to both side edges of the main body are supported. The thrust part is supported by the flange part, and the outer surface or the inner surface of the flange part is formed into a tapered shape, and the thickness of each flange part is expanded toward the upper end.

Therefore, in the journal part of the crankshaft, etc.
Even if its shape and machining precision rt are poor, the half bearing can be assembled so that it contacts the entire surface, and therefore there is no local contact, and there is no opening where abnormal FJ rubbing or seizure occurs.

[Brief explanation of the drawing]

FIGS. 1(a) and (bl are cross-sectional views of a half-split bearing with a flange according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view of a half-split bearing with a flange shown in FIGS. 3 is a perspective view of an example of a crankshaft, and FIGS. ), and FIG. 5 is an explanatory diagram showing the assembly mode of a conventional half-split bearing with a flange in cross section. Reference numeral 10: half-split bearing with a flange 10a...・Body part (radial bearing surface) 10b・
...Flame portion 10b'...Thrust bearing surface 10c...Oil groove patent applicant KoNDC Co., Ltd. Representative Patent attorney Yoshikatsu Matsushita Attorney Deputy Fumiyu Shima No. 1 Figure (a) 10P.

Claims (1)

[Scope of Claims] It is incorporated into a power conversion mechanism such as a crankshaft, and the shaft of this mechanism is supported by a main body which is curved in an arc, and the mechanism is supported by flanges provided on both side edges of the main body. A half-split bearing with a flange that supports a thrust part is characterized in that at least one of the outer surface or the back surface of the flange part is formed into a tapered shape, and the thickness of the flange part is increased toward the upper end. A half-split bearing with a flange.