JPH035683Y2 - - Google Patents

Description

[Detailed explanation of the idea] FIELD OF THE INVENTION This application relates to positioning structures.

Conventionally, positioning pins (generally called knock pins) have been used to improve assembly position accuracy when assembling parts. Positioning is performed by fitting a cylindrical pin, which is a convex portion provided on one component, into a cylindrical hole, which is a concave portion, provided on the other component. Fifth
The figure shows a state in which parts 10 and 11 are positioned and assembled by dowel pins 12. However, as shown in FIG. 6, which shows a cross section taken along the line in FIG. In this case, strict manufacturing dimensional accuracy must be ensured in two directions (X and Y directions). However, when assembling parts, the required positioning direction is often in one direction, and dimensional accuracy in other directions is unavoidable in order to fit the pins, which increases the number of man-hours for manufacturing parts and increases costs. It has a defect.

The present invention was devised in order to solve the above-mentioned problems, and consists of forming two convex parts whose extending directions are parallel to each other on one part, and forming two concave parts into which the two convex parts fit into the other part. The positioning structure determines the relative position of the two parts by fitting them together, the positioning structure having a positioning structure that is perpendicular to the fitting direction at a portion of at least one of the two protrusions that fits into the recess. A pair of long sides whose directional cross section forms a gap with the inner surface of the recess and extends perpendicularly to a plane including the axes of both the convex parts, and edges of the same pair of long sides. The gist of the positioning structure is that it has a pair of short sides that are connected to each other and substantially abut on the inner surface of the recess.

According to the invention of the present invention, when it is only necessary to perform positioning in one direction, the vertical cross-sectional shape of the portion of the positioning convex part that fits into the positioning recess with respect to the fitting direction is approximately rectangular, and the short side of the rectangle is formed in the recess. As shown in FIG. 1, which is a sectional view of the fitting portion between the protrusion and the recess according to the present invention, positioning is performed in the long side direction (Y direction) of the above-mentioned substantially rectangle. In the side direction (X direction), the allowable dimensional error increases from 2Z to 2T, and the number of man-hours required to ensure dimensional accuracy in the X direction is reduced, resulting in a cost reduction effect.

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 is a perspective view of a positioning pin, FIG. 3 is a sectional view taken along the - line in FIG. 2, and FIG. 4 is a perspective view showing an embodiment in which the present invention is used in an engine bearing cap. It is. Approximately half of the hollow pipe material in the axial direction is formed into a substantially rectangular parallelepiped with a convex portion by press working, etc., and the positioning pin 1 having a dimension A as a long side and a dimension B as a short side is at the tip. As shown in FIG. 3, a guide portion 1' for fitting into the recess is formed in the portion. In Fig. 4, the pin 1 is a portion formed into a substantially rectangular parallelepiped that is fitted and fixed by a dimension l (Fig. 2) below the joint surfaces 2', 2' of one component, the bearing cap 2. The A dimension of the convex part that protrudes is indicated by arrow C.
consistent with the direction. The other component, the engine block 3, is provided with a positioning hole 4, which is a recess, and a threaded portion 6, into which a tightening bolt 5 is threaded, following the hole 4.

Therefore, when assembling the bearing cap 2 to the engine block 3, the convex portion of the bearing cap 2 is fitted into the positioning hole 4 of the engine block 3, and the bearing cap 2 is fixed to the engine block 3 with the bolt 5. In this case, we only want to ensure positional and dimensional accuracy in the C direction, so the A dimension direction of the convex part is C.
It is aligned with the direction.

According to one embodiment of the present application, in the direction of arrow D (FIG. 4), the inner surface of the positioning hole 4 and the positioning pin 1
Since there is a gap between the long side and the long side, the dimensional accuracy in the D direction can be made larger than the dimensional accuracy in the C direction, so the manufacturing cost of the assembled parts can be reduced.

In addition, in this embodiment, the pipe material is processed using a press material or the like, so that mass production is possible, and the manufacturing cost of the positioning pins can be reduced.

Furthermore, since the positioning pin 1 of the embodiment of the present application is hollow, the hollow portion is inserted into the mounting bolt 5 as shown in FIG.
Since the bearing cap positioning pin 1 and the mounting hole of the mounting bolt 5 can be aligned in the same center line, the entire bearing cap can be made smaller.

[Brief explanation of drawings]

Fig. 1 is a drawing of a fitting portion between a protrusion and a recess according to the present invention, Fig. 2 is a perspective view of a positioning pin of an embodiment according to the present invention, and Fig. 3 is a cross section taken along the - line in Fig. 2. 4 shows an example of the use of FIG. 1, FIG. 5 shows a fitting portion between a positioning pin and a positioning hole in a conventional example, and FIG. 6 shows a sectional view taken along the line - in FIG. 1...Positioning pin, 2...Bearing cap, 3...Engine block.

Claims (1)

[Scope of utility model registration request] Two convex portions whose extending directions are parallel to each other are formed on one component, two concave portions into which the two convex portions fit are formed on the other component, and the two convex portions are fitted into each other, thereby making the two components relative to each other. A positioning structure for determining a position, wherein a section of at least one of the two convex portions that fits into the concave portion in a direction perpendicular to the fitting direction forms a gap with the inner surface of the concave portion. and a pair of long sides extending perpendicularly to a plane including the axes of both of the convex portions, and a pair of short sides connecting the edges of the same pair of long sides and substantially abutting the inner surface of the recess, respectively. A positioning structure comprising: