Grommet and wiper device

Abstract

To provide a grommet and a wiper device capable of sufficiently securing sealing performance even in an insertion port having a step.SOLUTION: A tubular main body portion 30 that is inserted into an insertion port formed in a window glass, and a first flange portion 41 and a second flange portion 42 that are respectively connected to both end portions in an axial direction of the main body portion 30, protrude outward in a radial direction from the main body portion 30, and are disposed on both surfaces of the window glass, wherein the insertion port is formed by at least two through-holes that are coaxially disposed and have different hole diameters that communicate with each other, the main body portion 30 has at least two hole insertion portions 32 provided for each of the through holes into which the main body portion 30 is inserted and formed to have the same diameters, and includes an outer hole insertion portion 32a adjacent to the first flange portion 41 among the hole insertion portions 32, and a ridge portion 33 formed over an entire circumference of an outer peripheral surface of the hole insertion portion 32 at a boundary A between the outer hole insertion portion 32a and the inner hole insertion portion 32b.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a grommet and a wiper device. [Background technology]

[0002] Generally, in a wiper device installed in a vehicle, a wiper shaft is inserted into an insertion opening provided in a window glass or a body panel. Because the wiper shaft is inserted into the insertion opening, it is necessary to ensure a seal between the wiper shaft and the insertion opening.

[0003] A known conventional waterproof structure for a wiper shaft is a grommet that is fitted between the wiper shaft and the insertion opening (see, for example, Patent Document 1). The grommet is made of rubber and is formed to cover the periphery of the insertion opening. The grommet has a hole insertion portion (insertion opening engagement portion) that fits into the insertion opening. The hole insertion portion has a lip shape at the top of the hole insertion portion that laps against the surface of the window glass to form a seal, and a thickness at the bottom of the hole insertion portion that increases the force that clamps the window glass. This configuration ensures a seal between the wiper shaft and the insertion opening.

[0004] Also, a technology has been disclosed in which the hole insertion portion is provided with a ridge portion that protrudes in the radial direction at the center in the axial direction (see, for example, Patent Document 2). According to this, when the grommet is inserted into the insertion opening, the ridge portion is crushed in the radial direction by the inner peripheral surface of the insertion opening, thereby ensuring sealing between the wiper shaft and the insertion opening.

[0005] It is known that vehicle window glass has a double structure to block out sound and light (see, for example, Patent Document 3). In this configuration, when providing a wiper shaft insertion opening in the double-structure window glass, for example, an insertion opening is provided in each window glass, and then the window glasses are overlapped and bonded together. In this case, when bonding the window glasses, the positions of the insertion openings may be misaligned, resulting in a diameter smaller than the specified diameter of the insertion opening. Therefore, to ensure that the wiper shaft is inserted into the insertion opening reliably, the diameter of one of the insertion openings may be increased to accommodate assembly errors or manufacturing errors in the window glass. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-223554 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-177955 [Patent Document 3] International Publication No. 2021 / 182290 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the above-mentioned Patent Document 3, the diameter of the insertion opening of one of the two window glasses is increased, which creates a step on the inner peripheral surface of the insertion opening of the (double-layered) window glass. This prevents reliable contact between the outer peripheral surface of the grommet and the inner peripheral surface of the insertion opening, making it difficult for the ridge portion to completely fill the gap between the hole insertion portion and the insertion opening. As a result, there is a problem in that the grommet cannot ensure sufficient sealing.

[0008] Therefore, the present invention provides a grommet and a wiper device that can ensure sufficient sealing even when the insertion opening has a step. [Means for solving the problem]

[0009] In order to solve the above problems, in a first aspect of the present invention, a grommet comprises a cylindrical main body portion that is inserted into an insertion port formed in an object to be attached, and first and second flange portions that are respectively connected to both axial ends of the main body portion, protrude radially outward from the main body portion, and are arranged on both sides of the object to be attached, the insertion port being formed by at least two through holes of different diameters that are arranged coaxially and communicate with each other, the main body portion having at least two hole insertion portions formed with the same diameter that are provided for each of the through holes to be inserted, and each of the hole insertion portions comprises an adjacent hole insertion portion adjacent to the first flange portion, and a convex ridge portion formed around the entire outer surface of the hole insertion portion at the boundary between the adjacent hole insertion portion and another hole insertion portion.

[0010] This configuration allows the smallest diameter through hole of the attachment object to be sandwiched between the first flange and the ridge formed at the boundary between the adjacent hole insertion portion and the other hole insertion portion. Furthermore, the first flange and the second flange, which are arranged on both sides of the attachment object, increase the contact area between the through hole and the hole insertion portion, preventing the inner circumferential surface of the through hole from being exposed to the outside. This ensures the sealing performance of the grommet.

[0011] In a second aspect of the present invention, in the grommet of the first aspect, the distance from the outer peripheral surface of the main body portion to the radially outer tip of the convex rib portion is shorter than the distance from the main body portion to the radially outer tip of each of the first flange portion and the second flange portion.

[0012] With this configuration, when inserting the grommet into the insertion opening, the through hole and the protruding ridge portion are less likely to interfere with each other, making assembly easier.

[0013] A third aspect of the present invention is the grommet according to either the first or second aspect, wherein the convex ridge portion has a plane that is along the boundary and perpendicular to the axial direction.

[0014] This configuration increases the contact area between the steps of at least two through holes with different diameters and the adjacent hole insertion portion. This allows the protruding portion and the through hole to come into contact over more surfaces, allowing the attachment object to be sandwiched between them. This ensures the grommet's sealing performance.

[0015] In a fourth aspect of the present invention, in the grommet according to any one of the first to third aspects, the convex ridge portion is formed between the boundary and the second flange portion.

[0016] This configuration increases the rigidity of the ridges without interfering with the through-holes corresponding to the other hole insertion portions, thereby increasing the clamping force of the attachment object and ensuring the sealing performance of the grommet.

[0017] In a fifth aspect of the present invention, in the grommet of any one of the first to fourth aspects, a part of the outer circumferential portion of the convex rib portion is located closer to the first flange portion than the radially inner root portion in a natural state.

[0018] This configuration allows the tip of the ridge portion to elastically deform, improving the adhesion between the through hole and the hole insertion portion. In addition, the elastic deformation of the ridge portion can absorb variations in the thickness of the through hole in the attachment object.

[0019] In a sixth aspect of the present invention, in a grommet according to any one of the first to fifth aspects, the first flange portion and the second flange portion each have a lip portion formed on their outer periphery, and each of the lip portions has a tapered shape in which the thickness gradually decreases as it moves radially outward, and in its natural state, the lip portions are curved so as to gradually approach each other as they move radially outward.

[0020] This configuration increases the clamping force of the object to be attached. It also absorbs variations in the thickness of the through-holes in the object to be attached, improving the adhesion between the object to be attached and each flange. The lip ensures sealing, allowing the entire flange to be made thinner. This ensures a gap between the grommet and the vehicle body panel, increasing the space inside the vehicle.

[0021] In a seventh aspect of the present invention, in a grommet according to any one of the first to sixth aspects, the insertion port has two through holes, and the distance from the outer surface of the main body portion to the radially outer tip of the convex rib portion is larger than that of the through hole with the smaller hole diameter and smaller than that of the through hole with the larger hole diameter.

[0022] This configuration allows the small diameter through hole to be sandwiched between the ridges. Also, since the ridges are smaller than the large diameter through hole when the grommet is inserted into the insertion opening, interference between the large diameter through hole and the ridges can be reduced.

[0023] In an eighth aspect of the present invention, a grommet according to any one of the first to seventh aspects is provided, an arm head to which the grommet is attached, and a wiper held by the arm head.

[0024] By configuring in this manner, it is possible to provide a grommet and a wiper device that can ensure sufficient sealing even when the insertion opening has a step. [Effects of the Invention]

[0025] According to the present invention, it is possible to provide a grommet and a wiper device that can ensure sufficient sealing even when the insertion opening has a step. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a schematic configuration diagram of a wiper device according to an embodiment of the present invention; [Figure 2] 1 is a perspective view illustrating a partial configuration of a wiper device using a wiper arm according to an embodiment of the present invention. [Figure 3] FIG. 2 is a perspective view of an arm head according to an embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional perspective view of an arm head according to an embodiment of the present invention. [Figure 5] 1 is a cross-sectional view of a grommet according to a first embodiment of the present invention. [Figure 6] 1 is a partially enlarged cross-sectional view of a grommet according to a first embodiment of the present invention. [Figure 7] FIG. 6 is a partially enlarged cross-sectional view of a grommet according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a partially enlarged cross-sectional view of a grommet according to a third embodiment of the present invention. [Figure 9] FIG. 10 is a partially enlarged cross-sectional view of a grommet according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram of a wiper device 6. Fig. 2 is a perspective view showing a partial configuration of the wiper device 6.

[0028] (Wiper device) 1 and 2, a wiper device 6 includes an arm head 1 attached to a window glass 4 of a vehicle 5, a wiper arm 2 supported so as to be able to swing about a wiper shaft 7 attached to the arm head 1, and a wiper blade 3 supported at the tip of the wiper arm 2. The wiper arm 2 has a base end fixed to the wiper shaft 7, and is reciprocated within a predetermined range by the rotation of the wiper shaft 7. The reciprocating motion of the wiper arm 2 causes the wiper blade 3 to wipe away raindrops, mud, and the like adhering to the wiped surface of the window glass 4.

[0029] (Direction of the wiper device) Here, the directionality will be briefly described in advance. In the following description, the longitudinal direction of the wiper arm 2 along the wiping surface of the window glass 4 is referred to as the X direction, the width direction of the wiper arm 2 along the wiping surface of the window glass 4 is referred to as the Y direction, and the height direction of the wiper arm 2 perpendicular to the wiping surface of the window glass 4 is referred to as the Z direction. The X, Y, and Z directions are perpendicular to each other.

[0030] The wiper blade 3 side (tip side) in the longitudinal direction of the wiper arm 2, i.e., the X direction, is defined as the X1 direction, and the arm head 1 side (base end side) is defined as the X2 direction. When viewed from the X1 direction to the X2 direction, the left side in the width direction Y of the wiper arm 2 is defined as the Y1 direction, and the right side is defined as the Y2 direction. The upper side (direction away from the glass wiping surface) in the height direction of the wiper arm 2, i.e., the Z direction, is defined as the Z1 direction, and the lower side (direction approaching the glass wiping surface) is defined as the Z2 direction.

[0031] (Wiper arm configuration) The wiper arm 2 has an arm shank 8 at its tip (X1 direction side) to which the wiper blade 3 is attached. The arm shank 8 is made of, for example, an injection-molded synthetic resin product. The arm head 1 is made of, for example, an aluminum die-cast processed product (metal processed product). The arm head 1 and arm shank 8, which are manufactured separately, are rotatably connected.

[0032] (Arm head configuration) Fig. 3 is a perspective view of the arm head 1 as viewed from the Y2 direction. Fig. 4 is a cross-sectional perspective view of the arm head 1 as viewed from the Y2 direction. 3 and 4, the arm head 1 includes a grommet 9 that is attached to the window glass 4 as an attachment object, a wiper shaft 7 that extends from the center of the grommet 9 to both sides in the Z direction and is inserted into the window glass 4 via the grommet 9, a wiper shaft fixing portion 15 that is attached to the end of the wiper shaft 7 in the Z1 direction, and a head cover 10 that covers the wiper shaft fixing portion 15. The arm head 1 is made of, for example, an aluminum die-cast processed product (metal processed product).

[0033] (Window glass) The window glass 4 is installed at both ends of the vehicle 5 in the longitudinal direction. The window glass 4 is formed of double glass 11. The double glass 11 is configured by overlapping an outer glass 12 facing the exterior of the vehicle and an inner glass 13 facing the interior of the vehicle. The outer glass 12 and the inner glass 13 each have an insertion opening 14 through which the wiper shaft 7 is inserted. The insertion opening 14 is formed by two through holes 18a, 18b (outer through hole 18a and inner through hole 18b) that are coaxially arranged and communicate with each other but have different hole diameters. Of the two through holes 18, the hole diameter of the outer through hole 18a formed in the outer glass 12 is smaller than the hole diameter of the inner through hole 18b formed in the inner glass 13.

[0034] (Wiper shaft) The wiper shaft 7 extends toward both sides in the Z direction, centered on the axial direction of a main body portion 30 of a grommet 9, which will be described later. The wiper shaft fixing portion 15 includes a fixing portion main body 16 attached to the Z1-direction end of the wiper shaft 7, and an arm support portion 20 integrally formed on the X1-direction side surface of the fixing portion main body 16. The fixing portion main body 16 is provided with an insertion hole 17 penetrating in the Z direction. The wiper shaft 7 is inserted through this insertion hole 17.

[0035] (Headcover) The head cover 10 is made of, for example, an injection-molded synthetic resin product, and is attached so as to cover the arm head 1. The head cover 10 includes an upper surface plate 21 in the Z1 direction, a pair of side surfaces 22 in the Y1 and Y2 directions, and a rear surface plate 23 with a semicircular arc surface in the X2 direction. As a result, the head cover 10 is formed in a box shape with an open front surface on the arm shank 8 side (X1 direction side) and an open bottom surface on the Z2 direction side.

[0036] (grommet) 5 and 6, grommet 9 includes a cylindrical main body 30 that is inserted into an insertion opening 14 formed in double-glazed glass 11, flanges 40 connected to both axial ends of main body 30, and a shaft seal 43 connected to flange 40. Grommet 9 is made of, for example, rubber.

[0037] (Main body) The main body 30 includes a hole insertion portion 32 provided on the outer peripheral surface of the main body 30. The hole insertion portion 32 is provided for each of the two through holes 18 and includes two hole insertion portions 32a, 32b (outer hole insertion portion 32a and inner hole insertion portion 32b) formed with the same diameter. A convex rib portion 33 is provided on the entire outer peripheral surface of the hole insertion portion 32 at a boundary A between the outer hole insertion portion 32a and the inner hole insertion portion 32b. The convex rib portion 33 protrudes radially outward from the outer peripheral surface of the hole insertion portion 32. The convex rib portion 33 includes a flat portion 34 formed on the vehicle exterior side, a connecting surface portion 36 extending from the radially outer end of the flat portion 34 toward the vehicle interior side, and an inclined surface portion 35 formed on the vehicle interior side. The flat portion 34 has a plane perpendicular to the axial direction. The flat portion 34 is along the boundary A. In other words, the flat portion 34 is on the same plane as the boundary A. The flat portion 34 abuts against the outer glass 12 .

[0038] The connecting surface portion 36 connects the tips of the flat surface portion 34 and the inclined surface portion 35 and is formed parallel to the axial direction. The inclined surface portion 35 is formed with an inclination so as to approach the flat surface portion 34 from the inner hole insertion portion 32b toward the radially outer side. The distance from the base of the convex rib portion 33 to the radially outer tip of the connecting surface portion 36 is greater than that of the outer through hole 18a and smaller than that of the inner through hole 18b.

[0039] (flange part) The flange portion 40 protrudes radially outward from the main body portion 30 and is disposed on both sides of the double glass 11. The flange portion 40 includes a first flange portion 41 provided on the vehicle exterior side and a second flange portion 42 provided on the vehicle interior side. The distance from the main body portion 30 to the radially outer tip of the first flange portion 41 and the second flange portion 42 is longer than the distance from the outer surface of the main body portion 30 to the radially outer tip of the connection surface portion 36 of the convex rib portion 33.

[0040] (First flange part) The first flange portion 41 includes two flat surfaces 41a, 41b (an outer flat surface 41a and an inner flat surface 41b) that face each other in the axial direction and extend along the outer glass 12, and a lip portion 50 formed on the outer periphery of each flat surface 41a, 41b. The thickness between the outer flat surface 41a and the inner flat surface 41b is constant. The lip portion 50 includes an inclined portion 60 that extends obliquely from the outer flat surface 41a radially outward toward the outer glass 12, and a tip portion 61 that connects the inclined portion 60 and the inner flat surface 41b radially outward. Each lip portion 50 has a tapered shape in which the thickness gradually decreases radially outward. In its natural state, the lip portion 50 is curved back so that the tip portion 61 approaches the second flange portion 42 as it extends radially outward.

[0041] (Second flange part) The second flange portion 42 is formed so that its thickness gradually decreases radially outward. That is, the second flange portion 42 includes an outer flat surface 42a extending along the inner glass 13, an inner inclined surface 42b formed closer to the vehicle interior than the outer flat surface 42a, and an arc portion 48 connecting the outer flat surface 42a and the inner inclined surface 42b on the radially outer side. The inner inclined surface 42b is inclined so as to gradually approach the outer flat surface 42a radially outward. The thickness of the arc portion 48 is greater than the thickness of the lip portion 50 of the first flange portion 41. The thickness of the base of the second flange portion 42 is greater than the thickness between the outer flat surface 41a and the inner flat surface 41b of the first flange portion 41.

[0042] (shaft seal) The shaft seal portion 43 includes a connecting portion 44 extending radially inward from the first flange portion 41 and a seal portion main body 45 extending in the Z1 direction from the inner end of the connecting portion 44. The connecting portion 44 extends obliquely in the Z2 direction as it extends radially inward. The lower end (the end on the Z2 side) of the seal portion main body 45 is connected to the inner end of the connecting portion 44. The seal portion main body 45 is cylindrical and molded integrally with the connecting portion 44. The seal portion main body 45 includes a cylindrical portion 46 and a skirt portion 47 attached to the Z1-direction end of the cylindrical portion 46. A plurality of annular protrusions 49 protruding radially inward are molded integrally with the inner circumferential surface of the cylindrical portion 46. The plurality of annular protrusions 49 are arranged in a row along the axial direction of the cylindrical portion 46. The skirt portion 47 is formed in a flared shape that gradually widens radially outward from the Z1-direction tip of the cylindrical portion 46 toward the Z1 direction.

[0043] Next, the function of the grommet 9 will be described. When the grommet 9 is inserted into the insertion opening 14, the inner flat surface 41b and the tip portion 61 of the first flange portion 41 come into contact with the exterior surface of the outer glass 12. The flat portion 34 of the ridge portion 33 also comes into contact with the interior-facing surface of the outer glass 12. Furthermore, the outer through-hole 18a in the outer glass 12 comes into contact with the outer-hole insertion portion 32a. This covers three surfaces of the outer glass 12, increasing the contact area between the grommet 9 and the outer glass 12. This reduces the gap between the grommet 9 and the outer glass 12. The outer glass 12 is therefore sandwiched between the first flange portion 41 and the ridge portion 33. Furthermore, the flange portions 40 disposed on both sides of the window glass 4 sandwich the window glass 4, thereby increasing the contact area between the through-hole 18 and the hole insertion portion 32.

[0044] Furthermore, when the wiper shaft 7 is inserted into the insertion hole 17, the annular protrusion 49 is compressed by the outer peripheral surface of the wiper shaft 7. This causes the annular protrusion 49 of the grommet 9, which is a member with lower rigidity than the wiper shaft 7, to elastically deform, increasing the surface pressure between the insertion hole 17 and the outer peripheral surface of the wiper shaft 7. Therefore, the annular protrusion 49 fills the gap between the insertion hole 17 and the outer peripheral surface of the wiper shaft 7.

[0045] As described above, in the double glass 11 to which the grommet 9 is attached, the insertion opening 14 is formed by at least two through holes 18 of different diameters. The insertion openings 14 are arranged coaxially and communicate with each other. The main body 30 of the grommet 9 is provided with a hole insertion section 32 for each through hole 18, with at least two having the same diameter. A ridge section 33 is formed at the boundary A between the outer hole insertion section 32a adjacent to the first flange section 41 and the inner hole insertion section 32b. The first flange section 41 and the second flange section 42 protrude radially outward from the main body 30 and are arranged on both sides of the double glass 11.

[0046] With this configuration, the ridge portion 33 can be formed at the boundary A between the outer hole insertion portion 32a adjacent to the first flange portion 41 and another hole insertion portion 32. This allows the outer glass 12 to contact the first flange portion 41, the outer hole insertion portion 32a, and the flat portion 34 of the grommet 9. This increases the contact area between the outer glass 12 and the grommet 9. As a result, the periphery of the smallest through hole 18 in the double glass 11 can be sandwiched between the first flange portion 41 and the ridge portion 33. This ensures sealing of the grommet 9 even when the insertion opening 14 has a step on its inner circumferential surface. Furthermore, sandwiching the outer glass 12 between the grommet 9 prevents the grommet 9 from shifting from the insertion opening 14 after installation in the window glass 4.

[0047] Furthermore, the flange portions 40 disposed on both sides of the double glass 11 increase the contact area between the through hole 18 and the hole insertion portion 32, preventing the inner circumferential surface of the through hole 18 from being exposed to the outside. Furthermore, the annular protrusion 49 fills the gap between the insertion hole 17 and the outer circumferential surface of the wiper shaft 7. Furthermore, the skirt portion 47 prevents moisture and the like from entering the gap between the insertion hole 17 and the outer circumferential surface of the wiper shaft 7. As a result, moisture and the like can be prevented from entering the inside of the main body portion 30 of the grommet 9. Therefore, the sealing performance of the grommet 9 can be ensured even if the insertion opening 14 has a step on its inner circumferential surface.

[0048] The distance from the outer peripheral surface of main body 30 to the radially outer tip of ridge 33 is shorter than the distance from main body 30 to the radially outer tips of first flange 41 and second flange 42. Therefore, when inserting grommet 9 into insertion opening 14, ridge 33 is less likely to interfere with double glass 11, making assembly easier.

[0049] The ridge portion 33 has a flat portion 34 formed along the boundary A and perpendicular to the axial direction. This increases the contact area between the steps of at least two through holes 18 with different diameters and the outer hole insertion portion 32a. This allows the ridge portion 33 and the outer through hole 18a to come into contact over more surfaces, enabling the outer glass 12 to be sandwiched between them. This ensures better sealing of the grommet 9 even in an insertion opening 14 with steps on its inner circumferential surface.

[0050] Two through holes 18 are formed in the insertion opening 14. The distance from the outer peripheral surface of the main body 30 to the radially outer tip of the ridge 33 is greater than that of the outer through hole 18a and smaller than that of the inner through hole 18b. This allows the outer through hole 18a to be sandwiched between the ridges 33. Furthermore, because the distance is smaller than that of the inner through hole 18b, interference between the inner through hole 18b and the ridge 33 can be suppressed when inserting the grommet 9 into the insertion opening 14.

[0051] The wiper device 6 includes a grommet 9, an arm head 1 to which the grommet 9 is attached, and a wiper 25 held by the arm head 1. Therefore, it is possible to provide a grommet 9 and a wiper device 6 that can ensure sufficient sealing even in an insertion opening 14 that has a step.

[0052] The grommet 9 effectively seals the gap between the wiper device 6 and the window glass 4, thereby preventing moisture and other substances from entering the vehicle interior, thereby extending the lifespan of vehicle interior parts and contributing to the achievement of Goal 7 of the United Nations-led Sustainable Development Goals (SDGs), which is to "Ensure access to affordable, reliable, sustainable and modern energy for all," Goal 9, which is to "Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation," and Goal 12, which is to "Ensure sustainable consumption and production patterns."

[0053] (Second embodiment) Next, a second embodiment will be described based on Fig. 7, with reference to Fig. 1. In the second embodiment, the same aspects as those in the first embodiment described above will be denoted by the same reference numerals, and the description thereof will be omitted (the same applies to the following embodiments). 1 and 7, in the second embodiment, the wiper device 6 is similar to the first embodiment in that it includes an arm head 1 attached to the window glass 4, a wiper arm 2 supported so as to be able to swing about a wiper shaft 7 provided on the arm head 1, and a wiper blade 3 supported at the tip of the wiper arm 2. The arm head 1 is similar to the first embodiment in that it includes a grommet 209 (this also applies to the following embodiments).

[0054] The difference between the first and second embodiments is that the shape of the grommet 9 in the first embodiment is different from the shape of the grommet 209 in the second embodiment. More specifically, a convex rib portion 233 is formed in the main body portion 230 from a boundary A between the outer hole insertion portion 232a and the inner hole insertion portion 232b to the second flange portion 42. The convex rib portion 233 is formed around the entire outer circumferential surface of the hole insertion portion 232, and protrudes radially outward from the outer circumferential surface of the hole insertion portion 232.

[0055] The protruding rib portion 233 includes a flat portion 234 formed on the exterior side of the vehicle, a connecting surface portion 236 extending obliquely from the radially outer end of the flat portion 234 toward the vehicle interior, and a vertical surface portion 237 extending from the cabin-side end of the connecting surface portion 236 to the second flange portion 42. The flat portion 234 has a plane perpendicular to the axial direction and abuts against the exterior glass 12. The connecting surface portion 236 connects the flat portion 234 and the vertical surface portion 237. The vertical surface portion 237 is formed along the inner through-hole 18b in a direction perpendicular to the flat portion 234. The cabin-side end of the vertical surface portion 237 is connected to the radially inner end of the second flange portion 42. The inner hole insertion portion 232b is integral with the vertical surface portion 237. The length of the connecting surface portion 236 is longer than the length of the flat portion 234, and the length of the vertical surface portion 237 is longer than the length of the connecting surface portion 236.

[0056] Next, the function of the grommet 209 will be described. When the grommet 209 is inserted into the insertion opening 14, the inner flat surface 41b and the tip portion 61 of the first flange portion 41 come into contact with the exterior surface of the outer glass 12. The flat portion 234 of the ridge portion 233 also comes into contact with the interior-facing surface of the outer glass 12. Furthermore, the outer through-hole 18a in the outer glass 12 comes into contact with the outer-hole insertion portion 232a. This covers three surfaces of the outer glass 12, increasing the contact area between the grommet 209 and the outer glass 12. The vertical surface portion 237 and the inner through-hole 18b of the inner glass 13 face each other in the radial direction with a small gap between them. This reduces the gap between the grommet 209 and the outer glass 12. The ridge portion 233 thus protrudes toward the Z2-side surface of the outer glass 12. Therefore, the outer glass 12 is sandwiched between the first flange portion 41 and the ridge portion 233.

[0057] Therefore, the second embodiment described above achieves the same effects as the first embodiment. In addition, in the grommet 209 described above, the ridge portion 233 is formed from the boundary A between the outer hole insertion portion 232a and the inner hole insertion portion 232b to the second flange portion 42. This allows the hole insertion portion 232 to fit along the step of the through hole 18. Furthermore, the vertical surface portion 237 integrated with the inner hole insertion portion 232b increases the rigidity of the ridge portion 233. Furthermore, the connecting surface portion 236 increases the rigidity of the ridge portion 233 without the ridge portion 233 interfering with the through hole 18 corresponding to the other hole insertion portion 232. Therefore, the grommet 209 can increase the clamping force of the double-glazed glass 11.

[0058] In the second embodiment described above, the length of the connecting surface portion 236 is longer than the length of the flat surface portion 234, and the length of the vertical surface portion 237 is longer than the length of the connecting surface portion 236. However, this is not limiting, and the length of the flat surface portion 234 may be longer than the length of the connecting surface portion 236.

[0059] (Third embodiment) Next, a third embodiment will be described with reference to FIG. The difference between the first and third embodiments is that the shape of the grommet 9 in the first embodiment is different from the shape of the grommet 309 in the third embodiment. More specifically, the main body 330 has a ridge 333 formed around the entire outer periphery of the hole insertion portion 332 at a boundary A between the outer hole insertion portion 332a and the inner hole insertion portion 332b.

[0060] The protruding rib portion 333 protrudes radially outward from the outer peripheral surface of the hole insertion portion 332. The protruding rib portion 333 includes a first inclined surface portion 335a formed on the vehicle exterior side, a connection surface portion 336 extending from the radially outer end of the first inclined surface portion 335a toward the vehicle interior side, and a second inclined surface portion 335b formed on the vehicle interior side. The first inclined surface portion 335a extends obliquely radially outward from the vehicle interior side end of the outer hole insertion portion 332a.

[0061] In a natural state, the radially outer end of the first inclined surface portion 335a is located closer to the first flange portion 41 than the radially inner base portion. The connecting surface portion 336 connects the tips of the first inclined surface portion 335a and the second inclined surface portion 335b and is formed parallel to the axial direction. The second inclined surface portion 335b extends in the same direction as the first inclined surface portion 335a. The cabin-side end of the second inclined surface portion 335b is connected to the inner-hole insertion portion 332b.

[0062] Next, the function of the grommet 309 will be described. When the grommet 309 is inserted into the insertion opening 14, the inner flat surface 41b and the tip 61 of the first flange portion 41 come into contact with the exterior surface of the outer glass 12. The first inclined surface portion 335a of the ridge portion 333 is compressed against the interior-facing surface of the outer glass 12, causing the first inclined surface portion 335a to elastically deform. Furthermore, the outer through-hole 18a in the outer glass 12 comes into contact with the outer-hole insertion portion 332a. This covers three surfaces of the outer glass 12, increasing the contact area between the grommet 309 and the outer glass 12. As a result, the gap between the grommet 309 and the outer glass 12 decreases. The outer glass 12 is therefore sandwiched between the first flange portion 41 and the ridge portion 333.

[0063] Therefore, the third embodiment described above provides the same effects as the first embodiment described above. In addition, in the grommet 309 described above, the first inclined surface portion 335a is positioned closer to the first flange portion 41 than the radially inner base portion in a natural state. This increases the contact area between the first inclined surface portion 335a and the outer glass 12, thereby improving adhesion between the through hole 18 and the hole insertion portion 332. Furthermore, this also absorbs variations in the thickness of the through hole 18 in the double glass 11.

[0064] (Fourth embodiment) Next, a fourth embodiment will be described with reference to FIG. The difference between the first embodiment and the fourth embodiment is that the shape of the second flange portion 42 in the first embodiment is different from the shape of the second flange portion 442 in the fourth embodiment.

[0065] Grommet 409 includes a main body 430 and a flange 440. Flange 440 protrudes radially outward from main body 430 and is disposed on both sides of double glass 11. Flange 440 includes a first flange 41 provided on the vehicle exterior side and a second flange 442 provided on the vehicle interior side.

[0066] The second flange portion 442 includes a curved portion 471 that curves gently axially inward along the inner glass 13, and a lip portion 435. The lip portion 435 is formed on the passenger compartment side and includes an inclined portion 470 that extends obliquely radially outward, and a tip portion 472 that connects the inclined portion 470 and the curved portion 471. The lip portion 435 has a tapered shape that gradually becomes thinner radially outward. In its natural state, the lip portion 435 curves back so that the tip portion 472 approaches the first flange portion 41 as it extends radially outward. The tip portion 472 is located radially inward of the tip portion 61 of the first flange portion 41.

[0067] Next, the function of the grommet 409 will be described. When grommet 409 is inserted into insertion opening 14, tip 472 of lip portion 435 is compressed by the surface of inner glass 13. This causes elastic deformation of lip portion 435, which is a member with lower rigidity than inner glass 13, and increases the contact area between the surface of inner glass 13 and curved portion 471 and tip 472 of lip portion 435. Therefore, the gap between the surface of inner glass 13 and lip portion 435 is filled, and second flange portion 442 clamps window glass 4.

[0068] Therefore, the fourth embodiment described above achieves the same effects as the first embodiment described above. In addition, the second flange 442 is provided with a lip 435. Therefore, the lip 435 can elastically deform and better absorb variations in the thickness dimension of the through hole 18 of the double glazing 11. This improves the adhesion between the double glazing 11 and the second flange 442. Therefore, the grommet 409 can increase the force with which it clamps the double glazing 11. Furthermore, the lip 435 ensures sealing, so the second flange 442 can be made thinner. This ensures a gap between the grommet 409 and the vehicle body panel, thereby increasing the space inside the vehicle.

[0069] In the above-described fourth embodiment, the second flange portion 442 is described as including the lip portion 435. However, this is not limitative, and the lip portion 435 may be formed on the second flange portion 42.

[0070] The present invention is not limited to the above-described embodiment, and includes various modifications to the above-described embodiment without departing from the spirit of the present invention.

[0071] In the above embodiment, the wiper device 6 is attached to a vehicle, but the present invention is not limited to this and may be attached to the window glass of a two-wheeled vehicle such as a scooter. In the above-described embodiment, the protruding portions 33, 233, 333 are integrally molded with the grommets 9, 209, 309, 409. However, this is not limiting, and the protruding portions 33, 233, 333 may be molded by two-color molding using a material other than rubber or the like.

[0072] In the above embodiment, the case where two through holes 18 are provided has been described. However, this is not limited to this, and it is sufficient that at least two through holes 18 are formed in the window glass 4, and three or more through holes 18 may be formed. In the above embodiment, the first flange portion 41 is formed on the vehicle exterior side, and the second flange portion 42 is formed on the vehicle interior side. However, this is not limited to this, and the positions of the first flange portion 41 and the second flange portion 42 may be reversed. In the above embodiment, the wiper device 6 is attached to the window glass 4. However, the present invention is not limited to this, and the wiper device 6 may be attached to a vehicle body panel. [Explanation of symbols]

[0073] 1...arm head, 2...wiper arm, 3...wiper blade, 4...window glass (object to be attached), 5...vehicle, 6...wiper device, 7...wiper shaft, 8...arm shank, 9...grommet, 10...head cover, 11...double glazing, 12...outer glass, 13...inner glass, 14...insertion port, 15...wiper shaft fixing part, 16...fixing part body, 17...insertion hole, 18...through hole, 18a...outer through hole, 18b...Inner through hole, 20...Arm support part, 21...Top plate, 22...Side plate, 23...Rear plate, 25...Wiper, 30...Body part, 32...Hole insertion part, 32a...Outer hole insertion part (adjacent hole insertion part), 32b...Inner hole Insertion part, 33... Protruding strip part, 34... Plane part, 35... Inclined surface part, 36... Connection surface part, 40... Flange part, 41a... Outer flat surface, 41b... Inner flat surface, 42... Second flange part, 42a... Outer flat surface, 42b... Inner Side inclined surface, 43... shaft seal portion, 44... connection portion, 45... seal portion main body, 46... cylindrical portion, 47... skirt portion, 48... arc portion, 49... annular convex portion, 50... lip portion, 60... inclined portion, 61... tip portion, 209... grommet, 230... main body portion, 232... hole insertion portion, 232a... outer hole insertion portion (adjacent hole insertion portion), 232b... inner hole insertion portion, 233... convex portion, 234... flat portion, 236... connection surface portion, 237... vertical surface portion, 309...grommet, 330...main body portion, 332...hole insertion portion, 332a...outer hole insertion portion (adjacent hole insertion portion), 332b...inner hole insertion portion, 333...ridge portion, 335a...first inclined surface portion, 335b...second inclined surface portion, 336...connection surface portion, 409...grommet, 430...main body portion, 435...lip portion, 440...flange portion, 442...second flange portion, 470...inclined portion, 471...curved portion, 472...tip portion, A...boundary

Claims

1. a cylindrical main body portion that is inserted into an insertion port formed in the attachment object; a first flange portion and a second flange portion respectively connected to both axial end portions of the main body portion, protruding radially outward from the main body portion, and disposed on both sides of the attachment object; Equipped with the insertion opening is formed by at least two through holes having different diameters that are arranged coaxially and communicate with each other, the main body portion has at least two hole insertion portions formed with the same diameter and provided for each of the through holes to be inserted; Among the hole insertion portions, an adjacent hole insertion portion adjacent to the first flange portion and a convex ridge portion formed around the entire outer periphery of the hole insertion portion at the boundary between the adjacent hole insertion portion and another hole insertion portion are provided. A grommet characterized by:

2. The distance from the outer peripheral surface of the main body portion to the radially outer tip of the convex rib portion is shorter than the distance from the main body portion to the radially outer tip of each of the first flange portion and the second flange portion.

2. The grommet according to claim 1.

3. The protruding portion has a plane perpendicular to the axial direction along the boundary.

2. The grommet according to claim 1.

4. The protruding ridge portion is formed between the boundary and the second flange portion.

2. The grommet according to claim 1.

5. A part of the outer circumferential portion of the convex streak portion is located closer to the first flange portion than a root portion on the radially inner side in a natural state.

2. The grommet according to claim 1.

6. the first flange portion and the second flange portion each have a lip portion formed on an outer periphery thereof, The lip portions have a tapered shape in which the thickness gradually decreases as they move radially outward, and in a natural state, they are warped so as to gradually approach each other as they move radially outward.

2. The grommet according to claim 1.

7. the insertion port has two of the through holes, The distance from the outer peripheral surface of the main body to the radially outer tip of the ridge portion is larger than that of the through hole with a smaller hole diameter of the two through holes and smaller than that of the through hole with a larger hole diameter.

2. The grommet according to claim 1.

8. The grommet according to any one of claims 1 to 7; an arm head to which the grommet is attached, and a wiper held by the arm head; Equipped with A wiper device characterized by:

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