Resin molded product and in-vehicle information equipment

Abstract

To provide a technology for preventing deterioration in positioning accuracy of fitting.SOLUTION: A resin molded product includes a first surface and a first positioning pin extending from the first surface in a first direction. The first positioning pin includes chamfered portions at two positions facing each other on the outer peripheral surface of the first positioning pin when viewed from the first direction, and a parting line is formed at the chamfered portions.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a resin molded product and an in-vehicle information device. [Background technology]

[0002] When assembling multiple components by fitting them together, a configuration may be adopted in which a positioning pin is provided on one component, and when this positioning pin is fitted into a fitting hole of the other component, the outer peripheral surface of the positioning pin abuts against the inner wall of the fitting hole, thereby improving the positional accuracy of the fitting. Patent Document 1 describes that a positioning boss that protrudes perpendicularly from a flat plate-shaped portion is injection molded. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-189544 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the core removal direction and the axial direction of the positioning boss (pin) are the same, so molding can be done simply by using a cavity and a core, but if the axial direction of the positioning pin is inclined with respect to the core removal direction, an undercut occurs and the mold cannot be made with only the cavity and the core. For this reason, an undercut process is further performed using a slide core, but in this case, a parting line occurs on the outer peripheral surface of the positioning pin at the joint between the core and the slide core. For this reason, a parting line (burr) protrudes from the outer peripheral surface of the positioning pin, which causes a problem of reducing the positional accuracy of the fit.

[0005] The present disclosure aims to provide a technology for preventing a decrease in positional accuracy of fitting by providing a chamfered portion on the outer circumferential surface of a resin molded product in which an undercut occurs during injection molding and providing a parting line on this chamfered portion so that when the outer circumferential surface is fitted to another fitting part so as to abut against the other fitting part, the parting line does not come into contact with the other fitting part. [Means for solving the problem]

[0006] In order to solve the above problems, the resin molded product of the present disclosure is a first surface and a first positioning pin extending in a first direction from the first surface; When viewed from the first direction, the first positioning pin has chamfered portions at two opposing locations on the outer peripheral surface of the first positioning pin, and a parting line is formed on the chamfered portions. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a technique for preventing a decrease in the positional accuracy of fitting. [Brief description of the drawings]

[0008] [Figure 1A] FIG. 1 is a diagram showing an example of a bracket provided with a positioning pin according to the first embodiment. [Figure 1B] FIG. 1B is a rear view of the bracket. [Figure 1C] FIG. 1C is a view of the tip of the second positioning pin in FIG. 1B as viewed from the direction of arrow 24. FIG. [Diagram 2] FIG. 2 is a diagram showing the corresponding relationship between the positions of the positioning pin as viewed from the front and the side. [Diagram 3] FIG. 3 is a diagram showing the top surface and the tapered surface when the positioning pin is viewed from the axial direction. [Figure 4] FIG. 4 is a diagram showing the positional relationship between the display unit to which the bracket is attached and the main body. [Diagram 5]FIG. 5 is a diagram showing a schematic configuration of a mold for injection molding the portion of the first positioning pin in the bracket. [Figure 6] FIG. 6 is a view showing the removal direction of the slide core in the mold of FIG. [Figure 7] FIG. 7 is a diagram showing, as a comparative example, an example in which a die is configured so that a joint between a core and a slide core is formed on the outer circumferential surface of a first positioning pin that does not have a chamfered portion. [Figure 8] FIG. 8 is a diagram showing an example of a parting line formed by the mold of FIG. [Figure 9] FIG. 9 is a diagram showing a configuration in the vicinity of the chamfered portion. [Figure 10] FIG. 10 is a front view showing the configuration of the first positioning pin according to the second embodiment. [Figure 11] FIG. 11 is a side view showing the configuration of the first positioning pin according to the second embodiment. [Figure 12] FIG. 12 is a front view showing the configuration of the first positioning pin according to the third embodiment. [Figure 13] FIG. 13 is a side view showing the configuration of the first positioning pin according to the third embodiment. [Figure 14] FIG. 14 is a diagram showing a configuration in the vicinity of a chamfered portion of a bracket according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The configurations of the following embodiments are merely examples, and the present invention is not limited to the configurations of the embodiments.

[0010] First Embodiment Figure 1A is a diagram showing an example of a bracket 30 equipped with a positioning pin according to this embodiment, Figure 1B is a rear view of the bracket 30, Figure 1C is a diagram showing the tip of a second positioning pin as viewed from the direction of arrow 24 in Figure 1B, Figure 2 is a diagram showing the correspondence between the positions of the positioning pin as viewed from the front and from the side, Figure 3 is a diagram showing the top surface and tapered surface of the positioning pin as viewed from the axial direction, and Figure 4 is a diagram showing the positional relationship between the display unit to which the bracket is attached and the main body part.

[0011] The bracket 30 is a resin molded product formed by injecting heated and melted plastic resin into a mold. One surface of the bracket 30 is attached to the main body 40, and the other surface of the bracket 30 is attached to the display unit 50, thereby connecting the display unit 50 to the main body. The bracket 30 is not limited to the shape shown in FIG. 1, and can be designed appropriately depending on the main body 40 and display unit 50 to be attached.

[0012] The bracket 30 of this embodiment is provided with a first positioning pin 10 on a first surface (first main surface) 31 on the display unit 50 side. The first positioning pin 10 is provided so as to extend in one direction towards the display unit 50 side from a part of the first surface (predetermined surface) 31A provided at a predetermined position. This first positioning pin 10 is formed in a cross shape when viewed from the first direction (extending direction). In other words, the first positioning pin 10 is shaped like a cylinder extending along the first direction, with V-shaped notches cut out from four places on its outer circumferential surface arranged at equal intervals around the axis towards the central axis 1X. The following This central portion is also called shaft portion 12, and the portions extending in the cross direction are also called reinforcing ribs 13.

[0013] When viewed from the first direction, the reinforcing rib 13 is provided in a cross shape from the central axis 1X in the radial direction of the cylinder, and the outer periphery is formed in an arc shape. The tip side of the reinforcing rib 13 is formed in a tapered shape, and the center of the tip side of the tapered surface, i.e., the tip surface 121 of the shaft portion 12, is formed in an approximately circular shape. Furthermore, the first positioning pin 10 of this embodiment has chamfered portions 132 at two opposing locations on the outer periphery of the reinforcing rib 13, and a parting line 133 when the first positioning pin 10 is injection molded as described later is formed on the chamfered portion 132. Note that "facing" here includes not only the surfaces of the two chamfered portions 132 facing each other in parallel, but also a state in which they are slightly deviated from parallel (for example, within ±10°).

[0014] The first positioning pin 10 is provided so as to extend in a different direction from the direction perpendicular to the first surface 31 of the bracket 30. Here, the first surface 31 is a surface perpendicular to the core removal direction during injection molding. For this reason, the first positioning pin 10 is provided in a direction different from the core removal direction, as described below. Hereinafter, the state of this first positioning pin 10 will also be referred to as "inclined with respect to the first surface 31" or "inclined with respect to the core removal direction", etc.

[0015] When the display unit 50 is attached to the bracket 30, the first positioning pin 10 fits into a fitting hole (positioning hole) of the display unit 50, and the outer peripheral surface 134 of the reinforcing rib 13 abuts against the inner peripheral surface of the fitting hole, thereby positioning the display unit 50 at a predetermined position relative to the bracket 30. Here, the first positioning pin 10 is inserted into the fitting hole so as to be perpendicular to the surface (mounting surface) on which the fitting hole of the display unit 50 is provided. For this reason, when the display unit 50 is attached to the bracket 30 with the mounting surface of the display unit 50 not parallel to the first surface 31 of the bracket 30, for example, the first positioning pin 10 is designed to be inclined with respect to the first surface 31 of the bracket 30.

[0016] The bracket 30 also has a second positioning pin 20 on the second surface (second main surface) 32 on the main body 40 side. The second positioning pin 20 is provided so as to extend in the second direction from a part of the second surface (predetermined surface) 32A provided at a predetermined position toward the main body. The second positioning pin 20 has a flat base 22 provided along the second direction, and two reinforcing ribs 23 provided so as to be perpendicular to the base 22. In other words, it has a shape like two cross-shaped pins like the first positioning pin 10 arranged in parallel, and the reinforcing ribs are connected to each other to form a continuous base. When the base 22 and the reinforcing rib 23 are viewed in the second direction, the side surfaces 221 and 231 facing each other across the intersection of the base 22 and the reinforcing rib 23 are vertically connected in the second direction from the predetermined surface 32A. The tip sides of these side surfaces 221, 231 form inclined surfaces 222, 232 that are inclined toward the intersection side of the base 22 and the reinforcing rib 23. In Fig. 1A, the direction in which the second positioning pin 20 extends (second direction) is parallel to the cavity removal direction, so it can be removed without using a slide core, and no chamfer is provided as in the first positioning pin 10. However, without being limited to this, if the direction in which the second positioning pin 20 extends (second direction) is different from the removal direction, a chamfer may be provided as in the first positioning pin 10.

[0017] When the bracket 30 is attached to the main body 40, the second positioning pin 20 is inserted into a long hole (positioning hole) in the main body 40 as shown by the two-dot chain line 25 in FIG. 1B, and the side surfaces 221, 231 of the base 22 and the reinforcing rib 23 abut against the inner peripheral surface of the positioning hole, thereby positioning the bracket 30 at a predetermined position relative to the main body 40. That is, as described above, the display unit 50 is positioned at a predetermined position relative to the bracket 30, and the bracket 30 is Since the display unit 50 is positioned at a predetermined position relative to the main body 40 , the display unit 50 is positioned relative to the main body 40 .

[0018] The first positioning pin 10 and the second positioning pin 20 are provided facing in opposite directions, and the first positioning pin 10 is provided at an angle to the direction in which the second positioning pin 20 extends (second direction).

[0019] <Manufacturing method> Next, a method for manufacturing the bracket 30 will be described. The bracket 30 of this embodiment is manufactured by injection molding. The bracket 30 is manufactured by using a mold having at least a cavity 61 and a core 62, in which heated and melted plastic resin is injected into the mold, and the plastic resin is molded into the shape of the mold.

[0020] FIG. 5 is a schematic diagram showing the configuration of a mold for injection-molding the first positioning pin 10 of the bracket 30, and FIG. 6 is a diagram showing the drawing direction of the slide core 63 in the mold of FIG. 5. As described above, the bracket 30 of this embodiment is formed with the first positioning pin 10 tilted with respect to the first surface 31. For example, when the core drawing direction is the X-axis direction (horizontal direction) in FIG. 2, the central axis 1X of the first positioning pin 10 is tilted upward (Y-axis direction). That is, the angle between the predetermined surface 31A and the central axis 1X is an acute angle above the central axis 1X, and an obtuse angle below the central axis 1X. In the example of FIG. 2, the central axis 1X is tilted toward the reinforcing ribs 13K and 13L among the four reinforcing ribs 13K, 13L, 13M, and 13N. Therefore, the angle between the outer circumferential surface or side wall of the reinforcing ribs 13K and 13L and the predetermined surface 31A is also an acute angle, and this portion is undercut. Therefore, the mold for molding the bracket 30 includes a slide core 63 in addition to a cavity 61 and a core 62, as shown in FIG.

[0021] 5, the core 62 is moved in a direction perpendicular to the first surface 31, as indicated by an arrow 64, when the mold is opened. The slide core 63 is moved in a direction perpendicular to the removal direction of the core 62, as indicated by an arrow 65, in which the central axis 1X is inclined. This makes it possible to injection mold the bracket 30 even if the first positioning pin 10 causes an undercut.

[0022] At this time, a parting line 133 is formed on the outer surface of the first positioning pin 10 at a position corresponding to the seam between the core 62 and the slide core 63. In this embodiment, the parting line 133 is not formed on the outer peripheral surface 134 that abuts on the inner wall of the fitting hole, but is formed at two opposing positions on the outer peripheral surface 134 by chamfering portions 132, and the mold is configured so that a seam 66 between the core 62 and the slide core 63 can be formed at the position of the chamfered portions 132. For this reason, in the bracket 30 of this embodiment, the parting line 133 is formed at the chamfered portions 132.

[0023] FIG. 7 is a diagram showing an example of a comparative example in which a mold is configured so that a joint 67 between the core 62 and the slide core 63 is formed on the outer peripheral surface 134 of the first positioning pin 10Q that does not have a chamfered portion 132. FIG. 8 is a diagram showing an example of a parting line 133 formed by the mold of FIG. 7. When a joint between the core 62 and the slide core 63 is formed on the outer peripheral surface 134 of the first positioning pin 10Q as in the comparative example, as shown in FIG. 8, a parting line (burr) 133 is formed protruding from the outer peripheral surface 134. Therefore, when the first positioning pin 10Q in the comparative example is inserted into the fitting hole of the display unit 50, the parting line (burr) 133 comes into contact with the inner wall of the fitting hole, preventing the outer peripheral surface 134 from abutting, which may result in a decrease in positioning accuracy. Specifically, the inner diameter of the fitting hole is increased so that the burr does not come into contact (the clearance between the positioning pin and the fitting hole is increased) ) and the positioning accuracy is reduced.

[0024] FIG. 9 is a diagram showing the configuration near the chamfered portion 132. As shown in FIG. 9, the first positioning pin 10 in this embodiment is formed so that the corner portion 135 of the outer peripheral surface 134 is chamfered and the outer surface of the chamfered portion 132 is located a predetermined distance LA away from the outer peripheral surface 134 toward the central axis. The predetermined distance LA is set to be greater than the protruding amount of the parting line 133 formed during injection molding. In this manner, in the bracket (resin molded product) 30 in this embodiment, the parting line 133 of the first positioning pin 10 is formed in the chamfered portion 132, so that the parting line 133 does not protrude outward from the outer peripheral surface 134. Therefore, when the first positioning pin 10 is inserted into the fitting hole of the display unit 50, the bracket 30 can prevent the parting line 133 from coming into contact with the inner wall of the fitting hole, thereby reducing the positioning accuracy.

[0025] In addition, when viewed from the first direction, the first positioning pin 10 in this embodiment has reinforcing ribs 13 that extend in a cross direction from the central axis 1X and have an arc-shaped outer periphery. As a result, the bracket 30 in this embodiment has a smaller volume than a cylindrical first positioning pin 10 with the same outer diameter, which allows for reduction in material and suppression of sink marks.

[0026] Furthermore, in the first positioning pin 10 in this embodiment, of the four reinforcing ribs 13K, 13L, 13M, and 13N extending from the central axis 1X along the cross direction, when viewed in the first direction, two corners formed by the outer circumferential surfaces of two adjacent reinforcing ribs 13K, 13L are chamfered flatly to form chamfered portions 132. In this manner, the bracket 30 in this embodiment is provided with the chamfered portions 132 at the corner portions of the reinforcing ribs 13K and 13L, and while sufficiently securing the abutment surface with the fitting hole, a parting line 133 is formed in the chamfered portion 132, thereby preventing a decrease in positioning accuracy.

[0027] Moreover, the bracket 30 in this embodiment includes a second positioning pin 20 extending in a second direction from the first surface 31 or a second surface 32 different from the first surface 31, and the second direction of the second positioning pin 20 is different from the first direction of the first positioning pin 10. Moreover, in the bracket 30 in this embodiment, the first positioning pin 10 and the second positioning pin 20 are provided in opposite directions, and the first positioning pin 10 is positioned relative to the first device, and the second positioning pin 20 is positioned relative to the second device. Furthermore, in the bracket 30 in this embodiment, the first device may be a display unit 50, and the second device may be a main body 40 that controls the display unit. In this way, the bracket 30 in this embodiment can connect the display unit (first device) 50 and the main body (second device) 40, and can prevent a decrease in the positioning accuracy relative to the display unit 50 and the positioning accuracy relative to the main body 40.

[0028] Second Embodiment Fig. 10 is a front view showing the configuration of the first positioning pin 10A according to the second embodiment, and Fig. 11 is a side view showing the configuration of the first positioning pin 10A according to the second embodiment. This embodiment is different from the first embodiment described above in that the first positioning pin 10A is cylindrical. Note that other configurations are the same as those of the first embodiment described above, so the same elements are given the same reference numerals and will not be described again.

[0029] The first positioning pin 10A according to this embodiment is a cylindrical member, and is provided in a first direction from the predetermined surface 31A toward the display unit 50. The first positioning pin 10A is provided in a direction different from the direction perpendicular to the first surface 31 of the bracket 30. In other words, the first positioning pin 10A is formed at an angle with respect to the core extraction direction. is.

[0030] The first positioning pin 10A has chamfered portions 132 that are chamfered into a flat shape at two opposing positions on an outer circumferential surface 134, and a parting line 133 is formed on the chamfered portions 132.

[0031] In this manner, in the bracket 30 of this embodiment, the parting line 133 is provided on the chamfered portion 132, so that when the first positioning pin 10A is inserted into the fitting hole of the display unit 50, it is possible to prevent the parting line 133 from coming into contact with the inner wall of the fitting hole, thereby preventing a decrease in positioning accuracy.

[0032] Third Embodiment Fig. 12 is a front view showing the configuration of the first positioning pin 10B according to the third embodiment, and Fig. 13 is a side view showing the configuration of the first positioning pin 10B according to the third embodiment. This embodiment is different from the first embodiment described above in that the chamfered portion 132 is formed on the outer peripheral surface 134 of the first positioning pin 10B, but the other configurations are the same as those of the first embodiment described above. For this reason, the same elements are given the same reference numerals, and repeated explanations will be omitted.

[0033] In the first positioning pin 10B in this embodiment, the chamfered portion 132 is provided by linearly chamfering the center portion rather than at a corner of the outer circumferential surface 134 of the reinforcing rib 13. Furthermore, in the first positioning pin 10B, a parting line 133 is formed in this chamfered portion 132.

[0034] FIG. 14 is a diagram showing a configuration near the chamfered portion 132 of the bracket 30 according to the third embodiment. As shown in FIG. 14, the first positioning pin 10B in this embodiment is formed so that the central portion 136 of the outer peripheral surface 134 is chamfered, and the outer surface of the chamfered portion 132 is located a predetermined distance LA away from the outer peripheral surface 134 toward the central axis. That is, the outer peripheral surfaces 134 located on both sides of the chamfered portion 132 are abutment surfaces that abut against the inner walls of the fitting holes. In the bracket 30 in this embodiment, the parting line 133 of the first positioning pin 10B is formed on the chamfered portion 132, so that the parting line 133 does not protrude outward from the outer peripheral surface 134. Therefore, when the first positioning pin 10B is inserted into the fitting hole of the display unit 50, the bracket 30 can prevent the parting line 133 from contacting the inner wall of the fitting hole and reducing the positioning accuracy.

[0035] <Additional Notes> [Appendix 1] The display device includes a display panel, a main body, and a bracket that connects the display panel and the main body, the bracket is a resin molded product including a first surface and a first positioning pin extending in a first direction from the first surface, When viewed from the first direction, the positioning pin has chamfered portions at two opposing locations on an outer circumferential surface of the first positioning pin, and parting lines are formed on the chamfered portions. In-vehicle information equipment.

[0036] [Appendix 2] The in-vehicle information device according to claim 1, wherein the first positioning pin extends in a cross direction from a central axis when viewed from the first direction, and has a reinforcing rib whose outer periphery forms an arc.

[0037] [Appendix 3] 3. The in-vehicle information device according to claim 2, wherein the chamfered portion is disposed on the outer periphery of the reinforcing rib that forms an arc.

[0038] [Appendix 4] The in-vehicle information device described in Appendix 2, wherein, when viewed from the first direction, a pair of corners of two adjacent reinforcing ribs that contact the outer circumferential surface are chamfered flatly to form the chamfered portion.

[0039] [Appendix 5] a second positioning pin extending in a second direction from the first surface or a second surface different from the first surface; The first direction and the second direction are different. 5. An in-vehicle information device according to any one of claims 1 to 4.

[0040] [Appendix 6] The second positioning pin extends from the second surface located on the opposite side of the first surface, the first locating pin is located relative to a first device; the second locating pin is located relative to a second device; 6. An in-vehicle information device as described in Appendix 5.

[0041] [Appendix 7] 7. The in-vehicle information device according to claim 6, wherein the first device is a display panel, and the second device is a main body that controls the display panel.

[0042] Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these. Various modifications based on the knowledge of those skilled in the art are possible without departing from the spirit of the claims. [Explanation of symbols]

[0043] 1X: Central axis 10, 10A, 10B: First positioning pin 12: Shaft 13 (13K, 13L, 13M, 13N): Reinforcement rib 20: Second positioning pin 22: Shaft 23: Reinforcement rib 30: Bracket 31: Front page 31A: Predetermined surface 32:Second side 40: Main body 50: Display unit 61: Cavity 62: Core 63: Slide Core 121: Tip surface 132: Chamfered part 133: Parting line 134: Outer surface 135: Corner part 137: Outer surface 233: Outer surface 331: Tapered surface

Claims

1. a first surface and a first positioning pin extending in a first direction from the first surface; When viewed from the first direction, the first positioning pin has chamfered portions at two opposing locations on an outer circumferential surface of the first positioning pin, and parting lines are formed on the chamfered portions. Resin molded product.

2. The resin molded product according to claim 1 , wherein the first positioning pin includes a reinforcing rib that extends in a cross direction from a central axis when viewed from the first direction and has an outer periphery that forms an arc.

3. 3. The resin molded product according to claim 2, wherein the chamfered portion is disposed on the outer periphery of the reinforcing rib that forms the arc.

4. The resin molded product according to claim 2 , wherein the chamfered portion is formed by chamfering a pair of corners of two adjacent reinforcing ribs that contact the outer peripheral surfaces of the reinforcing ribs in a flat shape when viewed from the first direction.

5. a second positioning pin extending in a second direction from the first surface or a second surface different from the first surface; The first direction and the second direction are different. The resin molded product according to any one of claims 1 to 4.

6. The second positioning pin extends from the second surface located on the opposite side of the first surface, the first locating pin is located relative to a first device; the second locating pin is located relative to a second device; The resin molded product according to claim 5.

7. 7. The resin molded product according to claim 6, wherein the first device is a display panel, and the second device is a main body portion that controls the display panel.

8. The display device includes a display panel, a main body, and a bracket that connects the display panel and the main body, the bracket is a resin molded product including a first surface and a first positioning pin extending in a first direction from the first surface, When viewed from the first direction, the first positioning pin has chamfered portions at two opposing locations on an outer circumferential surface of the first positioning pin, and parting lines are formed on the chamfered portions. In-vehicle information equipment.

Images