JPH0432494Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connected bearing beam structure in which bearing caps attached to each bearing boss portion of a cylinder block are connected by a beam.

[Conventional technology]

Conventionally, in order to reduce vibration and noise of the cylinder block and crankshaft, bearing beams have been used to connect parallel bearing caps with a beam and increase the rigidity of this part mainly in the direction along the crankshaft (engine longitudinal direction). structure is known.

Conventional bearing beam structures include those in which a bearing cap and a connecting beam are integrally molded (for example, Utility Model Application Publication No. 156947/1983,
No. 110743), or a rod-shaped member separate from the bearing cap, in which the connecting beam is inserted into both the left and right sides of each bearing cap to connect the bearing caps (for example, the
173657) etc. are known. The former connecting beam is formed as a block-shaped, plate-shaped, or rod-shaped member, and the latter connecting beam is also formed as a highly rigid rod-shaped member.

[Problem that the invention attempts to solve]

However, in the case where the connecting beam is formed integrally with each bearing cap, the integrated bearing beam has a complicated shape as a whole, resulting in poor workability and a problem of increased costs. Further, since the connecting beam portion has a thick wall structure with considerably high rigidity, the weight of the integrated bearing beam becomes large, which causes an increase in the weight of the engine.

In addition, by creating a structure in which the connecting beam is separate from the bearing cap,
If the structure shown in the publication is to use a thick rod with high rigidity for connection, the problem of increased weight still arises. Furthermore, in the structure shown in this publication, since the bearing caps are connected on both the left and right sides by connecting beams made of rods, the effect of suppressing vibrations etc. by the connecting beams is not efficiently exerted. In other words, from the perspective of using a connecting beam to suppress the deformation of the bearing cap and bearing boss in the front-rear direction of the engine due to deformation of the crankshaft, it is most efficient to suppress it directly below the crankshaft. If the beams are arranged on both the left and right sides of the bearing cap, the crankshaft and the connecting beam will be misaligned, and there is a risk that the deformation suppressing effect will not be effective. moreover,
Since the structure is such that the rod-shaped connecting beam is fixed after passing through each bearing cap, there is also the problem that it is difficult to fix the connecting beam.

The present invention has focused on the above-mentioned problems, and has been developed to increase the rigidity of the cylinder block and its bearings at low cost and without increasing the weight of the engine, and to efficiently improve the bearing cap and bearing boss with a simple structure. It is an object of the present invention to provide a connecting bearing beam structure that can suppress deformation of parts in the longitudinal direction of an engine and that can extremely easily attach a connecting beam.

[Means for solving problems]

The connected bearing beam structure of the present invention that meets this purpose is a connected bearing beam in which each bearing cap fixed to the bearing boss portion of the cylinder block is connected by a connecting beam separate from the bearing cap and extending in the direction along the crankshaft. In the structure, the connecting beam is constituted by a beam in which washer-shaped bolt mounting seat members are integrally fixed to an ultra-thin piano wire-shaped beam at intervals,
Each bearing cap is connected by the connecting beam by positioning the connecting beam at the center of the lower surface of each bearing cap and bolting it together from below.

[Effect]

In such a structure, the connecting beam is extremely lightweight compared to conventional ones because it is simply a member in which a washer-like bolt mounting seat member is integrally fixed to an extremely thin beam similar to that of a piano wire. , there is almost no increase in engine weight. This lightweight connecting beam is stretched across each bearing cap and fixed with bolts, and each bearing cap is connected, but even though it is extremely thin, it exhibits sufficient strength against tension. Because it is in a stretched state without sagging, even if it is a lightweight connecting beam, conventional thick-walled connections can prevent deformation of each bearing boss and bearing cap in the engine longitudinal direction (direction along the crankshaft). It has a suppressing function that is virtually the same as that of a beam, and suppresses cylinder block vibration and noise. Since this connecting beam is located at the center of the lower surface of each bearing cap, deformation of the bearing boss portion and the bearing cap is most effectively suppressed. Moreover, since the bolt is engaged from below,
There is ample work space and installation is easy.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 to 3 show a connected bearing beam structure according to an embodiment of the present invention, and show a case where the present invention is applied to a four-cylinder engine. In the figure, reference numeral 1 indicates a cylinder block, and reference numeral 2 indicates a bearing boss portion that is integrated with a plurality of cylinder blocks 1 arranged in the longitudinal direction of the engine. A bearing cap 3 is attached to each bearing boss portion 2, and a crankshaft (not shown) is supported by the bearing portion formed by the bearing boss portion 2 and the bearing cap 3.

Each bearing cap 3 is connected by a connecting beam 4 which is separate from the bearing cap 3. As partially shown in FIG. 3, the connecting beam 4 is made of a piano wire-shaped ultra-thin beam 5, and washer-shaped bolt mounting seat members 6 are integrally fixed to the beam 5 at a predetermined interval. It is completed. This beam 5 may be a high tension wire. In this case, the connecting beam 4 is formed, for example, by casting high tensile strength wire into the bolt attachment seat member 6.

The connecting beam 4 is located at the center of the lower surface of each bearing cap 3, and is engaged with each bearing cap 3 from below by a bolt 7. In this connected state, the beam 5 is stretched completely without slack, and the intervals between the bolt mounting seat members 6 are determined so as to achieve such a state. In addition,
The bolt 7 is fastened to a screw hole (not shown) provided in the bearing cap 3.

In the embodiment device configured as described above, the engine longitudinal direction (direction along the crankshaft)
Each bearing cap 3 is connected to each other by a connecting beam 4 extending from the bearing cap 3 to achieve a connected bearing beam structure. A load is applied to the crankshaft by the explosive force of each cylinder of the engine, and as the crankshaft deforms due to the load, the bearing boss 2 and the bearing cap 3 tend to deform mainly in the front-rear direction of the engine, but each bearing cap 3 are connected by the connecting beam 4, the rigidity of the bearing portion is increased and the above deformation is suppressed. By suppressing deformation, vibration and noise of the cylinder block 1 are reduced.

Although the beam 5 of the connecting beam 4 is extremely thin in the shape of a piano wire, it has sufficient strength against tension. Therefore, when adjacent bearing caps 3 try to deform in a direction where the distance between them increases, a tensile force is applied to the beam 5, but the beam 5 has sufficient strength to withstand that force.
Bearing cap 3 and bearing boss part 2
deformation is suppressed. In the case of deformation in the direction in which the distance between adjacent bearing caps 3 is reduced, a tensile force acts on the beam 5 where the adjacent portion is located, and the deformation of the bearing caps 3 is similarly suppressed. Since the connecting beam 4 is composed of an extremely thin beam 5 and a bolt mounting seat member 6, it is extremely lightweight, and even if it is attached, the weight of the entire engine will hardly increase. Further, since the bearing cap 3 and the connecting beam 4 are completely separate bodies, and the connecting beam 4 is of a post-installation type, the manufacturing and processing of the connecting beam 4 is extremely easy. Furthermore, since the bolts 7 are attached from below, the attachment is easy.

In addition, the connecting beam 4 is connected to the bearing cap 3.
It is attached to the center of the lower surface of the
In other words, since the bearing caps 3 are installed at the same position along the axis of the crankshaft when viewed from above, deformation of the bearing cap 3 can be suppressed most efficiently.

In this way, it has a simple structure and is easy to install.
Moreover, although the connecting beam 4 is extremely lightweight,
The effect of suppressing deformation of the bearing cap 3 can be obtained which is substantially the same as in the case of connection using a conventional high-rigidity beam. In the case of the unconnected general mass-produced bearing cap 14 shown in FIG.
When two high-rigidity beams 9 are installed on the left and right sides of the bearing cap 8 in the conventional case shown in the figure, a plate beam 11 extending in the direction along the crankshaft is installed on the lower surface of the bearing cap 10 in the conventional case shown in FIG. The figure shows the results of measuring the amount of deformation of the bearing cap for each case. The test was carried out on the crankshaft 1 as shown in Fig. 8.
This was done by adding a load W to 2 and measuring the amount of deformation δ of the lower end of the bearing cap 13 due to this load W. As shown in Fig. 4, compared to mass-produced products, the bearing beam structure greatly suppresses deformation of the bearing cap as shown by arrow _A1 , but in the case of the two-beam product of the present invention,
In the case of a plate beam, as shown by arrow _A2 , there is virtually no difference in the deformation suppressing effect.

[Effect of idea]

As explained above, when using the connected bearing beam structure of the present invention, although the connection is made by a connecting beam consisting of an ultra-thin beam and a bolt mounting seat member, the effect of suppressing deformation of the bearing cap inherent to the connected bearing beam structure can be substantially improved compared to the conventional structure. It is possible to effectively reduce the vibration and noise of the cylinder block while suppressing the increase in engine weight to the necessary minimum. In addition, by suppressing deformation of the bearing portion, the contact with the crankshaft at this portion can be equalized, and durability can be improved.

Further, since the connecting beam is completely separate from the bearing cap and has an extremely simple structure, it can be manufactured easily and at low cost.

Further, since the connecting beam is disposed at the center of the lower surface of the bearing cap, deformation of the bearing cap can be suppressed most effectively, and furthermore, since the connecting beam is connected from below with bolts, installation can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a bottom view of a coupled bearing beam structure according to an embodiment of the present invention, as seen from the bottom side of the cylinder block, FIG. FIG. 4 is a partial perspective view of the connecting beam of the device; FIG.
Among the test structures shown in the figure, a schematic perspective view of a mass-produced bearing cap, FIG. 6 is a schematic front view of a two-beam bearing cap part of the test structure shown in FIG. Schematic front view of the bearing cap part of the plate beam structure of the test structure,
FIG. 8 is a schematic side view of the crank bearing section showing the measurement state of the test shown in FIG. 4. 1...Cylinder block, 2...Bearing boss, 3...Bearing cap, 4...Connection beam, 5...Extremely thin beam, 6...Bolt mounting seat member, 7...Bolt.

Claims (1)

[Scope of utility model registration request] In a connected bearing beam structure in which each bearing cap fixed to the bearing boss portion of the cylinder block is connected by a connecting beam separate from the bearing cap extending in the direction along the crankshaft, the connecting beam is connected to a piano wire-shaped ultra-thin It consists of a beam in which washer-shaped bolt mounting seat members are integrally fixed at intervals between the beams, and by positioning the connecting beam at the center of the lower surface of each bearing cap and engaging the bolt from below, each bearing A connected bearing beam structure characterized in that caps are connected by the connecting beam.