JP2011085137A - Internal combustion engine having at least one camshaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variant example of a rolling bearing for installing a camshaft to an internal combustion engine. <P>SOLUTION: The internal combustion engine includes at least one camshaft 1 disposed through at least one rolling bearing 4. The camshaft 1 has an annular groove 2 and/or an annular bead 3 forming an inner ring of at least one rolling bearing 4, and formed at a rolling element 6 of the rolling bearing 4 in a complementary style. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an internal combustion engine having at least one camshaft provided via at least one rolling bearing.

  A rolling bearing is a bearing in which two members called an inner ring and an outer ring are relatively rotatable and separated from each other by rolling bodies. They are used to support radial and axial forces acting on the axes and shafts and are intended to keep power loss and wear caused by friction as low as possible. Between the three main members of such a rolling bearing, the inner ring, the outer ring and the rolling elements, mainly rolling friction occurs, which is relatively small due to the hardened steel surface of the inner and outer rings. Such rolling bearings have long been used for mounting camshafts.

  The present invention relates to a problem of providing a modified example of a rolling bearing for mounting a camshaft on an internal combustion engine.

  This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.

  The present invention is a rolling bearing generally comprised of an inner ring, an outer ring, and rolling elements disposed between them in order to mount a camshaft on an internal combustion engine. In this case, the camshaft has at least one rolling element. A rolling bearing having an annular groove and / or an annular bead that forms the inner ring / inner race of the bearing and in addition is formed complementary to the profile of the associated rolling element of the respective rolling bearing. Is based on the general idea. Such an annular bead or such an annular groove therefore makes it possible to guide and hold the rolling elements at the same time, so that in such a rolling bearing not only a radial force but also an axial force is possible. It can also be theoretically supported / transmitted. According to the present invention, for example, the camshaft has an annular bead, the associated rolling element has an annular groove formed complementary thereto, and the camshaft side annular bead and the rolling element side The interaction with the annular groove offers the possibility of absorbing axial forces.

  An advantageous development of the solution according to the invention is that the outer ring of the rolling bearing also has a shape adapted to the rolling elements. Therefore, the inner peripheral side of the outer ring is formed with respect to its shape to be complementary to the shape of the rolling element, thereby also allowing axial force support as well as radial force support. .

  Further important features and advantages result from the dependent claims, the drawings and the associated description of the illustrations based on the drawings.

  It should be understood that the features described above and those described below can be used not only in the combinations described, but also in other combinations or alone, without departing from the scope of the present invention.

  Exemplary and preferred embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. The same reference signs refer to the same, similar or functionally identical components.

FIG. 3 is a cross-sectional view of a camshaft showing a rolling bearing having three different configurations of the present invention. It is sectional drawing of the rolling bearing different from FIG. It is sectional drawing of another rolling bearing of this invention.

  As shown in FIGS. 1 to 3, the camshaft 1 of the present invention has an annular groove 2 or an annular bead 3 that forms an inner ring of a rolling bearing 4. Generally speaking, such a rolling bearing 4 is formed by an inner ring already formed by the camshaft 1, an outer ring 5, and a rolling element 6 disposed between the camshaft 1 and the outer ring 5 in this case. In the present invention, the annular bead 3 formed in the camshaft 1 or the annular groove 2 formed in the camshaft 1 is such that the rolling element 6 moves in a locked manner in or on the annular bead 3. (Run in a form-locking manner), it is formed complementary to the outer shape of the rolling element 6. Similarly, the inner peripheral side of the outer ring 5 can be formed to be complementary to the shape of the rolling element 6. The rolling element 6 is, for example, generally a sphere, or a convex shape at least in a predetermined region, or at least a predetermined value It can be formed into a cylinder having groove-like recesses in the region.

  In the figure on the left side of FIG. 2, a rolling bearing 4 having two different types of rolling elements 6 is depicted. In this example, the rolling element 6a is formed into a spherical body, and the rolling element 6b is formed into a needle, that is, a cylindrical shape. 2 shows the rolling bearing 4 configured in the same manner as the rolling bearing 4 on the left side of FIG. 1. In the rolling bearing of FIG. 2, the shape of the annular groove 2 of the camshaft 1 is that of the rolling element 6. It is simply adapted to the outer shape.

  The left view of FIG. 3 shows a rolling bearing 4 that is formed in a substantially cylindrical shape, ie, a needle shape, and has a rolling element 6 that moves in a rectangular annular groove 2 of the camshaft 1. The associated outer ring 5 is open at one front side and can slide over the rolling elements 6, and the assembly of the rolling bearing 4 can be made easier.

  In the figure on the right side of FIG. 3, the inner ring associated with the camshaft 1 is formed like an annular bead 3, while the rolling element 6 does not have a shape adapted to the annular bead 3 and is therefore in line with it. A rolling bearing 4 is shown which is only in contact. This results in particularly small rolling friction, but the rolling bearing 4 so configured cannot be used to transmit axial forces. However, it is possible to absorb the radial force by such a rolling bearing 4, and the rolling bearing 4 shown on the right side of FIG. 3 is, for example, among other rolling bearings 4 configured according to the present invention. Can be used in addition to one of Both rolling bearings 4 shown in FIG. 3 are configured to be assembled in a particularly simple manner.

  By the rolling bearing 4 of the present invention, the shape of the rolling element 6 is formed complementarily to the annular bead 3 disposed on the camshaft 1 or complementary to the annular groove 2 disposed on the camshaft 1. Therefore, not only the radial force but also the axial force can be absorbed.

  In general, it is possible to pre-position the rolling bearing 4 on the camshaft 1 by a clamp (not shown), and the annular bead 3 or the annular groove 2 positions the rolling bearing 4 in the axial direction. It is also conceivable to make it possible (see in particular FIG. 1 and FIG. 2).

1 Camshaft
2 annular groove
3 Annular beads
4 Rolling bearing
5 outer ring
6 Rolling elements
6a Rolling elements
6b Rolling element

Claims (6)

An internal combustion engine having at least one camshaft (1) provided via at least one rolling bearing (4),
The camshaft (1) forms an inner ring of at least one rolling bearing (4), an annular groove (2) formed complementary to the rolling element (6) of the rolling bearing (4), and / or an annular bead (3)
The rolling element (6) is formed in a convex shape and / or a cylindrical shape having at least one groove, and / or
The rolling bearing (4) has two different types of rolling elements (6a, 6b),
An internal combustion engine characterized by that. The internal combustion engine of claim 1,
An internal combustion engine characterized in that the outer ring (5) of the rolling bearing (4) has a shape adapted to the rolling element (6). An internal combustion engine according to any one of claims 1 and 2,
An internal combustion engine in which the rolling elements (6, 6a) are formed in a bearing sphere. An internal combustion engine according to any one of claims 1 to 3,
An internal combustion engine characterized in that the rolling bearing (4) is configured as an axial bearing. An internal combustion engine according to any one of claims 2 to 4,
An internal combustion engine characterized in that the front side of the outer ring (5) is opened so as to slide beyond the rolling elements (6). An internal combustion engine according to any one of claims 1 to 5,
An internal combustion engine characterized in that the annular bead (3) or the annular groove (2) makes it possible to position the rolling bearing (4) on the camshaft (1) in the axial direction.

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