JP4744282B2 - Mechanical parts mounting bracket - Google Patents

Description

  The present invention relates to a technique for improving the mounting accuracy of a mechanical component mounting bracket.

  Some vehicles such as trucks employ a configuration in which a compressor 3 of an air conditioner is attached to a side surface of an engine 1 using a bracket 2 as shown in FIGS. Specifically, the bracket 2 is fastened and fixed to the side surface of the engine 1 by a fastening member 4 such as a bolt, and the compressor 3 is fastened and fixed to the bracket 2 by a fastening member (not shown).

  In addition, the structure which attaches a compressor using a bracket is a well-known technique for the engineer of the technical field to which this invention belongs, and what should be disclosed as prior art document information is not found.

  By the way, in the bracket 2, the insertion hole 2 </ b> A is usually smaller than the diameter of the fastening member 4 in order to be able to absorb the dimensional variation of the screw hole 1 </ b> A formed on the side surface of the engine 1 and the insertion hole 2 </ b> A through which the fastening member 4 is inserted. Is slightly larger in diameter. The insertion hole 2 </ b> A is formed at a position away from the peripheral edge of the bracket 2, i.e., the center of gravity of the bracket 2, from the viewpoint of securing the mounting strength. For this reason, when the bracket 2 is fastened and fixed to the side surface of the engine 1, the bracket 2 is rotated by gravity around the fastening member 4 and tilted within the gap between the insertion hole 2 </ b> A and the fastening member 4. The mounting accuracy may be reduced. When the mounting accuracy of the bracket 2 is lowered, as shown in FIG. 4, the compressor 3 fastened and fixed to the bracket 2 is also tilted, and noise is generated in the belt that transmits the engine output to the pulley 3A. There was a risk of uneven wear of the belt.

As a countermeasure against such a problem, it is conceivable to improve the mounting accuracy of the bracket 2 by using a knock pin, dowel, etc. In addition to the cost increase, the shape of the bracket 2 and the engine 1 to which the bracket 2 is fastened are fixed. Became indispensable and could not be easily adopted.
It should be noted that it is desirable that the mounting accuracy is good not only for the compressor but also for other machine parts.

  Therefore, in view of the above-described conventional problems, the present invention can improve the mounting accuracy without intentionally using a knock pin or a dowel by intentionally changing the position where the insertion hole is brought into contact with the fastening member. An object of the present invention is to provide a mechanical part mounting bracket.

Therefore, according to the first aspect of the present invention, there is provided a mechanical component mounting bracket that is fastened and fixed by a fastening member that is inserted into the plurality of insertion holes in a state in which the mounting surface to the machine structure is substantially along the vertical surface. The insertion hole and the fastening inserted through the insertion hole so that the upper surface of the insertion hole comes into contact with the fastening member inserted through the insertion hole and the reference point of the bracket is set. It is formed at a position deviated downward from the center of the fastening member by about ½ of the difference in member diameter, and the other one of the insertion holes is connected to the fastening member inserted through the insertion hole . The fastening member inserted into the insertion hole is approximately ½ of the difference in diameter between the insertion hole and the fastening member inserted therein so that the inner surface of the insertion hole contacts and the bracket is prevented from rotating . It is inserted through an insertion hole formed at a position eccentric to the center and downward. Of the two vertical line connecting the center of the fastening member, the bracket is rotated and moved by the gravity acting on the center of gravity of the bracket around the fastening member is inserted into an insertion hole formed at a position eccentric downward It is formed at a position eccentric in the direction.

The invention according to claim 2 is characterized in that the through hole that does not decenter the formation position is formed to have a larger diameter than that of the formation position that is decentered.

  According to the first aspect of the present invention, the fastening member inserted through the insertion hole formed at a position eccentric downward is intentionally brought into contact with the upper surface of the insertion hole, and the reference point of the bracket is set. In addition, the bracket is formed at a position that is eccentric in the rotational movement direction, although the center of gravity and the insertion hole are spaced apart in the horizontal direction so that the bracket attempts to rotate around the fastening member inserted through the insertion hole. The fastening member inserted through the inserted insertion hole intentionally contacts the inner peripheral surface of the insertion hole, functions as a rotation stopper, and the rotation is suppressed. For this reason, since the mechanical component mounting bracket is positioned around the reference point by slightly decentering the formation position of the two insertion holes, a predetermined design position can be obtained without using a knock pin or dowel. Can be attached to.

  According to the invention of claim 2, the insertion hole that does not decenter the formation position is positioned substantially concentrically with the bolt that is inserted here, so that a positioning function is not required, and the diameter is larger than the insertion hole that eccentrically forms the formation position. In short, by using a so-called fool hole, the man-hours and costs required for processing can be reduced.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a bracket for mounting a compressor of an air conditioner driven by engine output on the side of an engine as an example of a machine part mounting bracket according to the present invention.
The bracket 10 includes a fixing portion 12 for fastening and fixing the compressor, and attachment portions 14 to 20 for fastening and fixing to the side surface of the engine. The fixing portion 12 has a substantially rectangular shape when viewed from the side of the engine, and a curved surface 12A that follows the outer shape of the compressor is formed on one surface thereof, and a fixing bolt insertion hole 12B through which the fixing bolt of the compressor is inserted is formed. It has been done. The attachment portions 14 to 20 are connected so that the attachment surfaces to the engine, which is a mechanical structure, extend along the substantially vertical plane so as to extend outward from the four corners of the fixing portion 12, and are inserted into the insertion holes 14A to 20A. It is fastened and fixed by a fastening member such as a bolt.

  Here, as a feature of the present invention, among the insertion holes 14A to 20A formed in the mounting portions 14 to 20, for example, the insertion hole 14A located at the upper left is inserted as shown in FIG. The hole 14 </ b> A and the bolt 22 inserted through the hole 22 are formed at a position eccentrically downward from the center of the bolt 22 by about ½ of the difference in diameter. Further, among the insertion holes 16A to 20A formed in the other mounting portions 16 to 20, for example, the insertion hole 16A positioned at the lower left is inserted into the insertion hole 16A and the insertion hole 16A as shown in FIG. It is formed at a position eccentric in the horizontal direction (left direction in the figure) that is separated from the center of gravity of the bracket 10 by about ½ of the difference in diameter of the bolts 24 to be formed.

  In this way, as shown in FIG. 2A, the upper surface of the insertion hole 14A is intentionally brought into contact with the bolt 22 inserted through the insertion hole 14A eccentrically downward, so that the reference of the bracket 10 can be obtained. Point setting is performed. In addition, the center of gravity of the bracket 10 and the insertion hole 14A are spaced apart from each other in the horizontal direction, so that the bracket 10 tries to rotate clockwise in the figure. However, as shown in FIG. The right side surface of the insertion hole 16A is intentionally brought into contact with the bolt 24 inserted through the insertion hole 16A, and functions as a rotation stopper to suppress the rotation.

  For this reason, the bracket 10 is positioned around the reference point only by slightly decentering the positions where the insertion holes 14A and 16A are formed. Therefore, the bracket 10 can be positioned at a predetermined design position without using a knock pin or dowel. Can be attached. And when the pulley inclination angle of the compressor fastened and fixed to the bracket 10 was measured, there was a variation of 0.95 ° at the maximum before the application of the present invention, but it was drastically reduced to a maximum of 0.42 ° after the application of the present invention.

Further, as shown in FIGS. 2C and 2D, the insertion holes 18A and 20A that do not decenter the formation position are positioned substantially concentric with the bolts 26 and 28 inserted therethrough, so that a positioning function is not required. The man-hour and cost required for processing can be reduced by making the diameter larger than the insertion holes 14A and 16A in which the formation positions are eccentric, that is, so-called fool holes.
Further, when the other insertion hole 18A or 20A is decentered instead of the insertion hole 16A exhibiting the rotation preventing function, it is approximately ½ of the difference in diameter between the insertion hole 18A or 20A and the bolt 26 or 28 inserted therein. Only the bolt 22 inserted through the insertion hole 14 </ b> A may be formed at a position eccentric in the direction of rotational movement due to gravity acting on the center of gravity of the bracket 10. Here, the direction of rotational movement due to gravity acting on the center of gravity of the bracket 10 means two vertical directions of a line segment connecting the centers of bolts inserted into one of the insertion holes 14A and the other insertion holes 16A to 20A. Among these, the one which goes to the rotation direction of the bracket 10 is said. Also, the insertion hole 14A for setting the reference point can be appropriately changed.

  Note that the present invention is not limited to the configuration in which the four attachment portions are connected to the fixed portion, and can be applied to any configuration in which any plurality of attachment portions are connected. Further, the present invention is not limited to the compressor of the air conditioner but can be applied to other machine parts.

Front view showing an example of a bracket embodying the present invention The formation position of the penetration hole in the same as above is shown, (A) is an explanatory view of the insertion hole that exhibits the reference point setting function, (B) is an explanatory view of the insertion hole that exhibits the rotation stopping function, (C) and (D) Is an explanatory diagram of other insertion holes The perspective view which shows the prior art which attaches a compressor using a bracket Side view showing compressor mounting state

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bracket 14 Attachment part 14A Insertion hole 16 Attachment part 16A Insertion hole 18 Attachment part 18A Insertion hole 20 Attachment part 20A Insertion hole 22 Bolt 24 Bolt 26 Bolt 28 Bolt

Claims (2)

A machine part mounting bracket that is fastened and fixed by a fastening member that is inserted through a plurality of insertion holes in a state in which the mounting surface to the machine structure is along a substantially vertical plane,
The insertion hole and the fastening member that is inserted through the insertion hole so that the upper surface of the insertion hole is brought into contact with the fastening member that is inserted through the insertion hole and the reference point of the bracket is set. Is formed at a position deviated downward from the center of the fastening member by about ½ of the difference in diameter of the fastening member, and the other one of the insertion holes is inserted into the fastening member inserted through the insertion hole. The center of the fastening member inserted through the insertion hole is approximately ½ of the difference between the diameters of the insertion hole and the fastening member inserted therethrough so that the inner surface of the hole comes into contact with the bracket to prevent rotation. The fastening member inserted into the insertion hole formed in the downwardly eccentric position among the two vertical directions of the line segment connecting the center of the fastening member inserted into the insertion hole formed in the downwardly eccentric position bracket by gravity acting on the center of gravity of the bracket around Mechanical parts mounting bracket but, characterized in that formed on the eccentric in the direction of rotation movement position.   The mechanical part mounting bracket according to claim 1, wherein a part of the insertion hole that does not decenter the formation position is formed to have a larger diameter than that of the formation position.

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