JPH0310321Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to an internal combustion engine in which a camshaft for opening and closing one or both of the intake valve and exhaust valve is connected to the cylinder head. This invention relates to a bearing device that supports the shaft.

[Conventional technology]

When a camshaft for opening and closing one or both of the intake valves and exhaust valves is pivotally supported on the cylinder head, there is a camshaft on the cylinder head side.
A plurality of bearing parts having semicircular holes into which the lower half of the journal part of the camshaft fits are integrally provided at appropriate intervals in the axial direction of the camshaft, and each bearing part has a semicircular hole into which the lower half of the journal part of the camshaft fits. By arranging a bearing cap body having a semicircular hole into which the camshaft is fitted so as to fit into the journal part of the camshaft, and fastening both ends of each bearing cap body to the cylinder head side with a pair of left and right bolts. It is well known, for example, from Japanese Utility Model Application Publication No. 55-35304, to pivotally support a camshaft.

When the bearing cap body is attached to the cylinder head side by tightening left and right bolts to pivotally support the camshaft in this way, the bearing cap body is located between the mounting bolt and the bolt hole into which the bolt fits. In order to prevent this movement, a notch pipe is fitted over the fastening bolt, and the notch pipe is placed across both the cylinder head side and the bearing cap body. The bearing cap body is fixed in position by tightly fitting the bearing cap body.

[The problem that the idea aims to solve]

However, in the conventional bearing cap body, each of the plurality of bearing parts on the cylinder head side is configured to be independent, so the position fixation using the above-mentioned knob pipe is achieved by attaching one bearing cap body to the cylinder head side. Therefore, it is necessary to fix the position using the same number of bolts as the number of fastening bolts of the bearing cap body, which not only requires a large number of parts but also a large number of bolts. , a large amount of processing and assembling work is required to fix its position, which significantly increases costs.Furthermore, the bolt fastening portions at both ends of each bearing cap body are large due to the size of the nozzle pipe, so the cylinder head cannot be I had to make it bigger.

The purpose of the present invention is to solve this problem and to provide a camshaft bearing device that uses a member to solve this problem and can reduce the generation of oil mist from the camshaft. That is.

[Means to solve the problem]

In order to achieve this object, the present invention integrally forms a plurality of bearing parts on the cylinder head side, each having a semicircular hole into which the lower half of the journal part of the camshaft fits. In a camshaft bearing device, each bearing cap body is provided with a semicircular hole into which the upper half of the journal part of the shaft fits, and the bearing cap bodies are fastened to the cylinder head side at both ends with bolts. ,
Adjacent bearing cap bodies among the respective bearing cap bodies are integrally connected to each other by a stay member extending in the axial direction of the camshaft, and the stay member is formed into a plate-shaped body. , is arranged above the camshaft so as to cover the cam on the camshaft, and at least two of the fastening bolts in each bearing cap body integrally connected by the stay member are connected to the cylinder. The structure is such that a notch pipe that fits into both the head side and the bearing cap body is provided.

[Functions and effects of the idea]

In this way, when adjacent bearing cap bodies among the respective bearing cap bodies are integrally connected by the stay member, at least one of the fastening bolts in each bearing cap body integrally connected by the stay member is By simply providing two bolts with a notch pipe that fits into both the cylinder head side and the bearing cap body, it is possible to simultaneously and completely prevent the displacement of each bearing cap body. This makes it possible to reduce the number of bolts that are fixed in position on the head side by means of the notch pipe.

Further, a stay member that integrally connects each of the bearing cap bodies is formed into a plate-like member, and the stay member is arranged above the camshaft so as to cover the cam on the camshaft. With this arrangement, the stay member can prevent the oil mist generated from each cam from scattering over a wide range as the camshaft rotates.

Therefore, according to the present invention, when bolting a plurality of bearing cap bodies to a cylinder head, the number of parts can be reduced, and
There is no need to make the bolt fastening parts at both ends of each bearing cap large for all the bearing cap bodies, and the cylinder head can be made smaller by this amount.Furthermore, the scattering of oil mist generated from the camshaft can be reduced. Since it is possible to prevent the amount of lubricating oil from disappearing together with blow-by gas by using a stay member to connect each bearing cap body with each other, it can be prevented from complicating the structure and increasing the number of parts. It has the effect of reliably reducing the

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 indicates a cylinder head in an internal combustion engine, and reference numeral 2 indicates a plurality of cams 3 for one or both of intake valves and exhaust valves.
4 and a plurality of journal parts 5 and 6, the upper surface of the cylinder head 1 has a semicircular bearing hole into which the lower half of the journal parts 5 and 6 of the cam shaft 2 fit. a bearing portion 7 having
8 are integrally molded.

Reference numerals 9 and 10 indicate bearing cap bodies fitted into the upper halves of the journal parts 5 and 6 of the camshaft 2, and both bearing cap bodies 9 and 10 have bolt holes 11a and 11b drilled at both ends thereof. ,12a,1
Bolts 13a, 13b, 14a inserted through 2b,
14b is screwed into tap holes 15a, 15b, 16a, 16b drilled on the cylinder head 1 side, thereby being fastened to both the bearings 7, 8.

Then, the adjacent two bearing cap bodies 9, 1
0 is a stay member 17 extending in the axial direction of the camshaft 2.
four bolts 1 for fastening these two bearing cap bodies 9 and 10.
3a, 13b, 14a, 14b, at least two bolts 13a, 14a are fitted with notch pipes 18, 19, and both of the notch pipes 1
8, 19 are large diameter holes 2 formed at the openings of the tap holes 15a, 16a in both the bearing parts 7, 8.
0, 21 and the large diameter holes 22, 23 formed at the openings of the bolt holes 11a, 12a in both bearing cap bodies 9, 10.

Further, the stay member 17 is formed into a plate-like member, and the stay member 17 of the plate-like member is placed above the camshaft 2 so that each of the cams 3 and 4 on the camshaft 2
be placed so as to cover the

When two adjacent bearing cap bodies 9, 10 are integrally connected via the stay member 17 as described above, four bolts 13a, 13b, 1 are used to attach both bearing cap bodies 9, 10.
At least two bolts 13 among 4a and 14b
Knock pipes 18 and 19 for a and 14a
By simply fixing the positions by the above, it is possible to simultaneously and completely prevent the displacement of both bearing cap bodies 9 and 10.

Furthermore, since the stay member 17 connecting the two bearing cap bodies 9 and 10 is configured to cover the upper part of both the cams 3 and 4 on the camshaft 2, the rotation of each cam 3 and 4 is prevented. Accordingly, the oil mist generated from the respective cams 3 and 4 can be prevented from scattering over a wide range.

Note that the bolts to which the knot pipes 18 and 19 are applied are the bolts 13a and 1 as in the above embodiment.
4a, other bolts 13a and 13b, 1
4a and 14b, 13b and 14b, 13a and 14
b, or 13b and 14a, and the present invention is applicable not only to the case of connecting two bearing cap bodies, but also to the case of connecting three or more bearing cap bodies. Needless to say, it can also be applied.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional front view, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a cross-sectional view of FIG. 5 is a cross-sectional view of FIG. 1, and FIG. 6 is an exploded view of FIG. 4. 1... Cylinder head, 2... Camshaft, 5, 6
... Journal part, 7, 8 ... Bearing part, 9, 10
...Bearing cap body, 13a, 13b, 14a,
14b... Bolt, 18, 19... Pipe for notch.

Claims (1)

[Scope of utility model registration request] A plurality of bearing parts are integrally molded on the cylinder head side, each having a semicircular hole into which the lower half of the journal part of the camshaft fits. In a camshaft bearing device in which bearing cap bodies each having a circular hole are arranged and each of the bearing cap bodies is fastened to the cylinder side at both ends with bolts, the adjacent one of the bearing cap bodies The bearing cap bodies are integrally connected to each other by a stay member extending in the axial direction of the camshaft. The cam is disposed so as to cover the cam on the camshaft, and at least two of the fastening bolts in each bearing cap body integrally connected by the stay member are connected to the cylinder head side and the bearing cap body. A bearing device for a camshaft in an internal combustion engine, characterized in that a notch pipe is provided that fits on both ends.