The present invention relates to a structure of a mounting section of a compressor body mounted on a vehicle, relating specifically to a compressor structure which can suppress vibration and noise accompanied by the vibration when the compressor is mounted.
When a compressor mounted on a vehicle is mainly incorporated in an air conditioning system for vehicles, the compressor is often mounted on a vehicle-side mounting section by using through bolts. In addition, the compressor, though sometimes being mounted directly on a vehicle body, is often mounted on a bracket as a vehicle-side mounting section, and the bracket is often mounted on a vehicle body or an engine mounted in the vehicle.
For example as shown in
Besides, though a structure where a fin is provided at a boss section for mounting a compressor in order to develop the heat radiation performance of the compressor is known as a prior art shown in Patent document 1, there has not been any approach which devises the boss section for mounting in order to suppress vibration like the present invention.
Patent document 1: JP-9-112419-A
Therefore an object of the present invention is to provide a structure of a compressor in which the vibration in a mounting state can be efficiently suppressed by simple improvement in a case where the compressor is mounted on a vehicle-side mounting section by using through bolts as described above.
To achieve the above-described object, a compressor according to the present invention is a compressor mounted on a vehicle-side mounting section by using through bolts, characterized in that an area of a first mounting surface of the compressor at which the compressor is mounted on the vehicle-side mounting section is set greater than an area of a second mounting surface where a seat surface for a head of each through bolt is formed, and a vibration in mounted state is suppressed by providing different sizes in area to both mounting surfaces.
As shown in the after-mentioned analysis result, vibration reduction effect can be obtained by providing different area sizes to both mounting surfaces much more efficiently than by changing a shape of the other part. Therefore by simple improvements of the shape and structure in this part, vibration of the compressor in the mounting state can be suppressed effectively. Further, because the different area sizes are provided only to both mounting surfaces, no substantial change is required in the external shape of the compressor, so that a desirable vibration reduction can be achieved as keeping the lightweight property.
As to the magnitude relation between the area sizes of the above-described mounting surfaces, for example, the area of the first mounting surface is preferably not less than 1.11 times of the area of the second mounting surface. This relation corresponds to the case where the outer radius of the boss section of the second mounting surface is set to 9.5 mm when the outer radius of the boss section forming the first mounting section is 9 mm, in the after-mentioned analysis result.
Further, in order to provide different area sizes to both mounting surfaces, for example, a structure where a diameter of a boss section of the compressor into which each through bolt is inserted is gradually increased from the second mounting surface side toward the first mounting surface side can be employed. This can make it possible to give a desirable area size relation without sudden shape change, so that vibration can be suppressed as providing a desirable strength performance that can prevent a stress concentration. Such a plurality of boss sections can be provided, and the same structure may be employed for each boss section.
Furthermore, a compressor structure mounting to the vehicle-side mounting section can be substantively optional form. For example, the vehicle-side mounting section may be a bracket which is attached to either a vehicle body or an engine mounted in a vehicle.
Thus, the compressor according to the present invention can suppress vibration efficiently in a mounting state by simple improvement where the different area size relation is provided between the first mounting surface and the second mounting surface, in a structure mounting on the vehicle-side mounting section by using through bolts. Further, because no substantial change is required in the external shape of the compressor, a desirable vibration reduction can be achieved as keeping the lightweight property in a whole compressor.
Hereinafter, desirable embodiments of the present invention will be explained as referring to figures, and an advantage of the present invention will be explained as referring to results of the quality engineering experiment using computer analysis.
Thus, first mounting surface 4 and second mounting surface 6 are provided with different area sizes to each other, so that vibration of compressor 1 in the mounting state can be suppressed. The following analysis is performed in order to confirm that the effect of the vibration reduction is far greater than a case where the shape of the other part is changed.
As shown in
Object places to be measured and analyzed are the following symbols as shown in
A: Existence or nonexistence of the recess on the root side of the boss section to insert the through bolt, which is expressed as “Boss recess” for the change factor in Table 1.
B: The angle of the rib provided integrally on the root side of the boss section, relative to the perpendicular from the compressor body housing surface, which is expressed as “Boss rib” for the change factor in Table 1.
C: The length of the boss section, which is expressed as “Boss length” for the change factor in Table 1.
D: The thickness of the part on the root side of the boss section, which is expressed as “Boss root thickness” for the change factor in Table 1.
E: The outer radius on the first mounting surface of the boss section, which is expressed as “Boss outer radius on 1st mounting surface side” for the change factor in Table 1, while the outer radius on the second mounting surface of the boss section is set to 9 mm in each condition.
F: The thickness of the part on the root side of the boss section on the cylinder head side, which is expressed as “Boss root thickness on cylinder head side” for the change factor in Table 1.
G: The thickness of the wall forming the crank chamber, which is expressed as “Crank chamber wall thickness” for the change factor in Table 1.
H: The thickness of the front housing, which is expressed as “Front housing thickness” for the change factor in Table 1.
Concrete numeric value for the size change in each place is shown in Table 1.
FEM (Finite Element Method) frequency response analysis was performed by using the test model shown in
As shown in
Such an effect of the vibration reduction can be obtained regardless of the type of the compressor basically. In addition, it is understood that the vibration reduction effect is provided more surely by applying a similar form for a plurality of boss sections.
The structure of a compressor according to the present invention is applicable to every compressor in which the vibration thereof in the mounted state is required to be reduced.
Number | Date | Country | Kind |
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2007-242446 | Sep 2007 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2008/065010 | 8/22/2008 | WO | 00 | 3/19/2010 |