Parts assembly structure

Abstract

To provide a component assembly structure capable of improving positioning accuracy.SOLUTION: A component assembly structure comprises: an assembled component 11 having a positioning pin 22 provided at a base part 21; a first component 12 having a first hole part 41 fitted onto the positioning pin 22; and a second component 13 having a second hole part 42 fitted onto the positioning pin 22. The positioning pin 22 has a first shaft part 31 located on the base part 21 side, and a second shaft part 32 located on a tip side and having a smaller diameter than the first shaft part 31. The first component 12 is positioned in the assembled component 11 by fitting the first hole part 41 into the first shaft part 31. The second component 13 is positioned in the assembled component 11 by fitting the second hole part 42 into the second shaft part 32.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a component assembly structure. [Background technology]

[0002] For example, a vehicle display device includes a housing, a display, a dial, a light guide plate, and a faceplate. The vehicle display device is assembled by assembling the display and dial to the housing, and fitting pins on the housing into holes in the light guide plate and holes in the faceplate. Examples of such component assembly structures include those described in the following patent documents. Patent document 1 discloses a structure in which a protrusion is provided on a support pillar of a meter case, and the light guide plate and the dial are positioned relative to the support pillar by passing the protrusion through holes in the light guide plate and the dial. Patent document 2 discloses a structure in which a protrusion is provided on a counter, and the L-shaped bracket 3 is fixed to the protrusion by inserting the protrusion into a hole 3a of the L-shaped bracket 3 and press-fitting a spring plate nut into the protrusion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-271102 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-148011 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the light guide plate hole and the dial hole are fitted sequentially to the support pillar protrusion for assembly. Because the support pillar protrusion has the same outer diameter in the axial direction, there is a risk that the outer surface of the protrusion may be scraped and damaged when fitting the light guide plate hole to the support pillar protrusion. This can result in improper fitting of the support pillar protrusion into the dial hole, or it can cause looseness, making highly accurate positioning difficult. In Patent Document 2, an L-shaped bracket inserted into the counter protrusion is fixed with a spring plate nut. In this case, the counter protrusion is shaped like a truncated cone, making highly accurate positioning of the L-shaped bracket difficult.

[0005] The present invention has been made in view of the above circumstances, and has as its object to provide a part assembly structure that improves the positioning accuracy of parts. [Means for solving the problem]

[0006] In order to achieve the above object, the component assembly structure according to the present invention includes a component to be assembled, the component having a positioning pin at a base thereof, and a first hole portion into which the positioning pin is fitted. and is made of a material harder than the material of the positioning pin. The assembly comprises a first part and a second part having a second hole portion that fits onto the positioning pin, the positioning pin having a first shaft portion located on the base side and a second shaft portion located on the tip side and having a smaller diameter than the first shaft portion, the first part being positioned on the attached part by fitting the first hole portion into the first shaft portion, and the second part being positioned on the attached part by fitting the second hole portion into the second shaft portion. [Effects of the Invention]

[0007] The component assembly structure of the present invention provides a positioning pin of the component to be assembled with a large-diameter first shaft portion and a small-diameter second shaft portion. This prevents the first hole portion of the first component from damaging the outer surface of the second shaft portion when the first hole portion of the first component is fitted into the first shaft portion, and allows the second hole portion of the second component to be properly fitted into the second shaft portion, thereby achieving the effect of improving the positioning accuracy of the components. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a part assembly structure according to this embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, showing the part assembly structure. [Figure 3] FIG. 3 is a perspective view showing the mounted part. [Figure 4] FIG. 4 is a perspective view showing a state in which the first part is assembled to the assembly receiving part. [Figure 5] FIG. 5 is a cross-sectional view illustrating a method of assembling a first part to a receiving part. [Figure 6] FIG. 6 is a cross-sectional view illustrating a method of assembling the second part to the receiving part. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially the same.

[0010] In the following description, of the first, second, and third directions that intersect with one another, the first direction will be referred to as the first in-plane direction X, the second direction will be referred to as the second in-plane direction Y, and the third direction will be referred to as the axial direction Z. The first in-plane direction X, the second in-plane direction Y, and the axial direction Z are approximately perpendicular to one another. The axial direction Z is the assembly direction of the assembled part, the first part, and the second part.

[0011] [Embodiment] <Parts> Fig. 1 is a cross-sectional view showing a part assembly structure according to this embodiment, and Fig. 2 is a cross-sectional view showing the part assembly structure taken along line II-II in Fig. 1. The part assembly structure according to this embodiment is applied to an in-vehicle instrument 10.

[0012] As shown in Figures 1 and 2, an in-vehicle instrument 10 includes a receiving part 11, a first part 12, and a second part 13. When the part assembly structure of this embodiment is applied to the in-vehicle instrument 10, the case corresponds to the receiving part 11, the cover glass corresponds to the first part 12, and the front cover (end cover) corresponds to the second part 13. The first part 12 is a part that cannot be formed with a guide shape (tapered shape), such as a router part or a pressed part, and is generally made of a material harder than the material of the positioning pin. The second part 13 is an intermediate part that requires high positioning accuracy.

[0013] The mounted component 11 has a base 21 and a positioning pin 22. The positioning pin 22 is integrally formed on the mounting surface 21a on the front side of the base 21. The positioning pin 22 is formed along the axial direction Z and has a cylindrical shape centered on the axial center O. The positioning pin 22 has a first shaft portion 31 and a second shaft portion 32. The first shaft portion 31 has the same outer diameter along the axial direction (axial direction Z), and the second shaft portion 32 has the same outer diameter along the axial direction (axial direction Z). The first shaft portion 31 has an outer diameter d1, and the second shaft portion 32 has an outer diameter d2. The outer diameter d2 of the second shaft portion 32 is smaller than the outer diameter d1 of the first shaft portion 31. Therefore, the outer diameter d1 of the first shaft portion 31 and the outer diameter d2 of the second shaft portion 32 are such that the outer diameter d1 is greater than the outer diameter d2.

[0014] The first component 12 has a first hole 41. The first hole 41 has a notch shape that opens to one side in the second in-plane direction Y, but may also have an elongated hole shape that does not open to one side in the second in-plane direction Y, or a perfect circle shape. The first hole 41 fits into the first shaft portion 31 of the positioning pin 22. The first hole 41 has an inner diameter d11 in the first in-plane direction X. The inner diameter d11 of the first hole 41 is the same as or slightly smaller than the outer diameter d1 of the first shaft portion 31 of the positioning pin 22. In other words, the first component 12 is assembled to the assembled component 11 so that it is positioned by fitting (or press-fitting) the first hole 41 into the first shaft portion 31.

[0015] The second component 13 has a second hole 42. The second hole 42 has an elongated hole shape that is long in the second in-plane direction Y, but may also have a circular shape. The second hole 42 is fitted onto the second shaft portion 32 of the positioning pin 22. The second hole 42 has an inner diameter d12 in the first in-plane direction X. The inner diameter d12 of the second hole 42 is the same as or slightly smaller than the outer diameter d2 of the second shaft portion 32 of the positioning pin 22. Therefore, the second component 13 is assembled to the assembled component 11 so that it is positioned by fitting (or press-fitting) the second hole 42 onto the second shaft portion 32.

[0016] That is, the inner diameter d11 of the first hole portion 41 of the first part 12 is the same diameter as the outer diameter d1 of the first shaft portion 31 of the positioning pin 22 in the assembled part 11, but is larger than the outer diameter d2 of the second shaft portion 32 of the positioning pin 22 in the assembled part 11.

[0017] <Parts to be assembled> FIG. 3 is a perspective view showing the mounted part.

[0018] As shown in FIG. 3 , the mounted component 11 has a base 21 and a positioning pin 22. The base 21 has a plate shape that is long along the first in-plane direction X and the second in-plane direction Y. The base 21 has a mounting surface 21a that is flat along the first in-plane direction X and the second in-plane direction Y on one side in the axial direction Z. The base 21 also has a step 21b on one side in the axial direction Z and on one side in the second in-plane direction Y. The step 21b is provided on the mounting surface 21a along the first in-plane direction X, and an end face 21c that extends along the axial direction Z is formed between the mounting surface 21a and the step 21b. On the other side in the axial direction Z, the base 21 has a rectangular frame portion 21d.

[0019] The positioning pin 22 has a first shaft portion 31 and a second shaft portion 32. The first shaft portion 31 is provided on the base portion 21 side, and the second shaft portion 32 is provided on the tip side. The positioning pin 22 is provided with a tip portion 33 having a truncated cone shape that tapers toward the tip side of the first shaft portion 31. The positioning pin 22 also has a truncated cone-shaped inclined portion 34 between the first shaft portion 31 and the second shaft portion 32. The base portion 21 is provided with a ring-shaped recess 21e around the positioning pin 22 on the mounting surface 21a.

[0020] <First part> FIG. 4 is a perspective view showing a state in which the first part is assembled to the assembly receiving part.

[0021] As shown in FIG. 4 , the first component 12 has a plate shape and is provided with a first hole 41. The first hole 41 has a notch shape that opens from approximately the center of the first component 12 to one side in the second in-plane direction Y. The shape of one end face 43 of the first component 12 in the second in-plane direction Y is substantially the same as the shape of the end face 21c of the step portion 21b of the assembled component 11. The first hole 41 fits onto the first shaft portion 31 of the positioning pin 22. The first component 12 is positioned relative to the assembled component 11 in the first in-plane direction X by fitting the first hole 41 onto the first shaft portion 31. At this time, the first component 12 is positioned relative to the assembled component 11 in the second in-plane direction Y by abutting the end face against the end face 21c of the step portion 21b.

[0022] <Second part> As shown in FIGS. 1 and 2 , the second part 13 has a plate shape and is provided with a second hole 42. The second hole 42 has an elongated hole shape that is long from approximately the center of the second part 13 along the second in-plane direction Y. The second part 13 has a covering part 44 on one side of the second hole 42 in the axial direction Z. Like the second hole 42, the covering part 44 has an elongated shape that is long along the second in-plane direction Y. The second hole 42 fits into the second shaft part 32 of the positioning pin 22. The second part 13 is positioned in the first in-plane direction X with respect to the assembled part 11 by fitting the second hole 42 into the second shaft part 32.

[0023] <How to assemble parts> FIG. 5 is a cross-sectional view showing a method of assembling a first part to a receiving part, and FIG. 5 is a cross-sectional view showing a method of assembling a second part to a receiving part.

[0024] As shown in FIG. 5 , first, the first component 12 is assembled to the assembly-receiving component 11. That is, the first hole 41 of the first component 12 is fitted into the first shank 31 of the positioning pin 22 of the assembly-receiving component 11. In this case, the inner diameter d11 of the first hole 41 of the first component 12 is larger than the outer diameter d2 of the second shank 32 of the assembly-receiving component 11. That is, when the first hole 41 of the first component 12 is fitted into the first shank 31 of the positioning pin 22, a gap is formed between the inner circumferential surface of the first hole 41 and the outer circumferential surface of the second shank 32. Therefore, the inner circumferential surface of the first hole 41 of the first component 12 does not come into strong contact with the outer circumferential surface of the second shank 14, and the outer circumferential surface of the first shank 31 is not scraped and damaged by the first hole 41. Then, the first hole portion 41 of the first component 12 is properly fitted into the first shaft portion 31 of the positioning pin 22 of the component to be assembled 11. By fitting the first hole portion 41 into the first shaft portion 31, the first component 12 is assembled to the component to be assembled 11 so that the first component 12 is positioned relative to the component to be assembled 11 in the first in-plane direction X.

[0025] As shown in FIG. 6 , next, the second part 13 is assembled to the assembled part 11. That is, the second hole 42 of the second part 13 is fitted into the second shank 32 of the positioning pin 22 of the assembled part 11. In this case, since the outer peripheral surface of the first shank 31 of the positioning pin 22 is not damaged, the second hole 42 of the second part 13 is fitted properly into the second shank 32 of the positioning pin 22 of the assembled part 11. By fitting the second hole 42 into the second shank 32, the second part 13 is assembled to the assembled part 11 so that it is positioned relative to the assembled part 11 in the first in-plane direction X.

[0026] Furthermore, if the first hole portion 41 of the first part 12 and the second hole portion 42 of the second part 13 are perfectly circular, the first part 12 and the second part 13 are also positioned relative to the assembled part 11 in the second in-plane direction Y.

[0027] As described above, the component assembly structure (vehicle instrument 10) according to this embodiment comprises an assembled component 11 having a positioning pin 22 provided at a base 21, a first component 12 having a first hole 41 that fits onto the positioning pin 22, and a second component 13 having a second hole 42 that fits onto the positioning pin 22. The positioning pin 22 has a first shaft 31 located on the base 21 side and a second shaft 32 located on the tip side and having a smaller diameter than the first shaft 31. The first component 12 is positioned in the assembled component 11 by fitting the first hole 41 into the first shaft 31, and the second component 13 is positioned in the assembled component 11 by fitting the second hole 42 into the second shaft 32.

[0028] According to the component assembly structure of this embodiment, by providing the positioning pin 22 of the assembled component 11 with the large-diameter first shank 31 and the small-diameter second shank 32, the inner diameter d11 of the first hole 41 of the first component 12 is larger than the outer diameter d2 of the second shank 32 of the positioning pin 22 of the assembled component 11. As a result, when the first hole 41 of the first component 12 is fitted onto the first shank 31, the first hole 41 of the first component 12 is prevented from coming into contact with the second shank 32 and damaging the outer surface, and the second hole 42 of the second component 13 can be properly fitted onto the second shank 32 to position the second component 13 to the assembled component 11, thereby improving the component positioning accuracy.

[0029] Furthermore, in the component assembly structure according to this embodiment, the first shaft portion 31 and the second shaft portion 32 each have the same outer diameter along the axial direction. Therefore, the first hole portion 41 of the first component 12 can be properly fitted onto the first shaft portion 31 of the positioning pin 22, and the second hole portion 42 of the second component 13 can be properly fitted onto the second shaft portion 32 of the positioning pin 22. Furthermore, because the first component 12 is fitted onto the first shaft portion 31 and the second component 13 is fitted onto the second shaft portion 32, the backlash of the first component 12 and the second component 13 can be adjusted individually.

[0030] Furthermore, in the component assembly structure according to this embodiment, a truncated cone-shaped inclined portion 34 is provided between the first shaft portion 31 and the second shaft portion 32. Therefore, the second hole portion 42 of the second component 13 is guided by the inclined portion 34, and can be smoothly fitted onto the second shaft portion 32 of the positioning pin 22.

[0031] The component assembly structure of the present embodiment described above can be applied to, for example, a vehicle display device, in which the housing corresponds to the component to be assembled, the light guide plate corresponds to the first component, and the dial corresponds to the second component.

[0032] The component assembly structure according to the embodiment of the present invention described above is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims.

[0033] The component assembly structure according to this embodiment may be configured by appropriately combining the components of the above-described embodiments and reference examples. [Explanation of symbols]

[0034] 10. On-board instruments 11 Parts to be assembled 12 First part 13 Second part 21 Base 22 Locating pin 31 First shaft 32 Second shaft 33 Tip 34 Slope 41 1st hole 42 2nd hole X 1st in-plane direction Y Second in-plane direction Z axis direction

Claims

1. a mounting part having a positioning pin at a base thereof; a first component having a first hole portion that fits onto the positioning pin and that is made of a material that is harder than a material of the positioning pin; a second component having a second hole portion that fits onto the positioning pin; Equipped with The positioning pin has a first shaft portion located on the base side and a second shaft portion located on the tip side and having a smaller diameter than the first shaft portion, the first part is positioned relative to the assembled part by fitting the first hole part into the first shaft part, the second part is positioned relative to the assembled part by fitting the second hole part into the second shaft part; Parts assembly structure.

2. The first shaft portion and the second shaft portion each have the same outer diameter along the axial direction. The part assembly structure according to claim 1 .

3. A frustum-shaped inclined portion is provided between the first shaft portion and the second shaft portion. The part assembly structure according to claim 1 or 2.

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