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 cylindrical body part 30 to be inserted into an insertion port formed in a window glass, and two flange parts 40 respectively connected to both end parts in an axial direction of the body part 30 and projecting outward in a radial direction from the body part 30 and arranged on both surfaces of the window glass are provided, the insertion port is formed by at least two through-holes coaxially arranged and communicating with each other and having different hole diameters, the body part 30 is provided with at least two hole insertion parts 3 formed for each inserted through-hole and having the same diameter, and one of the hole insertion parts 3 is formed over the whole periphery of an outer peripheral surface of the hole insertion part 3 and provided with a projection part 3c filling a gap between the corresponding through-hole.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 two 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 has at least two hole insertion portions that are provided for each of the through holes to be inserted and are formed with the same diameter, and one of the hole insertion portions has a convex portion that is formed around the entire outer surface of the hole insertion portion and fills the gap between it and the corresponding through hole.

[0010] With this configuration, the ridge portion can reliably fill the gap between one of at least two through holes with different diameters and the hole insertion portion. Furthermore, the two flanges 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 hole insertion portion corresponding to the through hole with the smallest inner diameter among the through holes includes the ridge portion.

[0012] This configuration allows the ridge portion to easily come into contact with the inner peripheral surface of the through hole with the smallest inner diameter. Therefore, it is easier to ensure sealing at the location of the through hole with a small opening area than at the location of a large opening area. Furthermore, since the opening area of ​​the through hole is small, it is not necessary to increase the outer diameter of the ridge portion. This further ensures sealing of the grommet.

[0013] In a third aspect of the present invention, in the grommet of either the first or second aspect, the object to be attached is a part of a vehicle, and the hole insertion portion corresponding to the through hole located furthest outside the vehicle among the through holes is characterized by having the convex rib portion.

[0014] With this configuration, the ridge portion can fill the gap between the through hole located on the outermost side of the vehicle and the hole insertion portion, thereby preventing moisture from entering the vehicle interior through the insertion opening.

[0015] A fourth aspect of the present invention is the grommet according to any one of the first to third aspects, characterized in that only one of the convex ridge portions is provided.

[0016] With this configuration, the protruding ridge portion elastically deforms to fill the gap between the through hole and the hole insertion portion, thereby increasing the contact area between the through hole and the hole insertion portion, thereby increasing the surface pressure between the through hole and the hole insertion portion.

[0017] In a fifth aspect of the present invention, in the grommet of any one of the first to fourth aspects, a plurality of the convex rib portions are provided, and each of the convex rib portions is provided over the entire axial area of ​​the hole insertion portion.

[0018] With this configuration, even if the insertion opening slides in the axial direction, the through hole can reliably fill the gap between the hole insertion portion and the through hole due to the multiple protruding ridges provided.

[0019] In a sixth aspect of the present invention, in a grommet according to any one of the first to fifth aspects, the two flange portions each have a lip portion formed on the 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 allows the lip portion to be elastically deformed. Therefore, by arranging the flange portion on the attachment object so that the lip portion is elastically deformed, the adhesion between the attachment object and the flange portion can be improved. This further ensures sealing. Furthermore, the lip portion's elastic deformation can absorb variations in the thickness dimension of the through hole in the attachment object. The entire flange portion can be made thinner to the extent that sealing is ensured by the lip portion. This allows a gap to be secured between the grommet and the vehicle body panel, thereby increasing the space inside the vehicle.

[0021] A seventh aspect of the present invention is characterized by comprising a grommet according to any one of the first to sixth aspects, an arm head to which the grommet is attached, and a wiper held by the arm head.

[0022] 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]

[0023] 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]

[0024] [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] FIG. 2 is a partially enlarged cross-sectional view of the grommet according to the 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

[0025] 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.

[0026] (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.

[0027] (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.

[0028] 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.

[0029] (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.

[0030] (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).

[0031] (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.

[0032] (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.

[0033] (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.

[0034] (grommet) 5 and 6, grommet 9 includes a cylindrical main body 30 that is inserted into an insertion opening 14 formed in double glass 11, two flanges 40 connected to both axial ends of main body 30, and a shaft seal 43 connected to flanges 40. Grommet 9 is made of, for example, rubber.

[0035] (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, inner hole insertion portion 32b) formed with the same diameter. Of the two hole insertion portions 32, the outer hole insertion portion 32a inserted into the outer through hole 18a includes a ridge portion 33 formed around the entire outer peripheral surface. The ridge portion 33 protrudes radially outward from the outer peripheral surface of the hole insertion portion 32. In the first embodiment, only one ridge portion 33 is provided on the outer hole insertion portion 32a.

[0036] (flange part) The two flange portions 40 protrude radially outward from the main body portion 30 and are arranged on both sides of the double glass 11. The two flange portions 40 include an outer flange portion 41 provided on the vehicle exterior side and an inner flange portion 42 provided on the vehicle interior side.

[0037] (Outer flange) The outer flange portion 41 includes two flat surfaces 41a, 41b (the outer flat surface 41a and the inner flat surface 41b) that face each other in the axial direction and extend along the outer glass 12, and a lip portion 34 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 34 includes a sloped 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 sloped portion 60 and the inner flat surface 41b radially outward. The lip portion 34 has a tapered shape in which the thickness gradually decreases radially outward. In its natural state, the lip portion 34 is curved such that the tip portion 61 approaches the inner flange portion 42 as it extends radially outward.

[0038] (Inner flange) The inner flange portion 42 is formed so that its thickness gradually decreases radially outward. That is, the inner 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 formed 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 34 of the outer flange portion 41. The thickness of the base of the inner flange portion 42 is greater than the thickness between the outer flat surface 41a and the inner flat surface 41b of the outer flange portion 41.

[0039] (shaft seal) The shaft seal portion 43 includes a connecting portion 44 extending radially inward from the outer 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.

[0040] Next, the function of the grommet 9 will be described. When the grommet 9 is inserted into the insertion opening 14, the ridge portion 33 is compressed in the diameter-reducing direction by the inner circumferential surface of the outer through-hole 18a at the insertion opening 14. This causes the ridge portion 33 of the grommet 9, which is a member with lower rigidity than the window glass 4, to elastically deform, increasing the surface pressure between the outer through-hole 18a and the outer-hole insertion portion 32a, which includes the ridge portion 33. Therefore, the ridge portion 33 fills the gap between the inner circumferential surface of the outer through-hole 18a and the outer-hole insertion portion 32a. Furthermore, the two flange portions 40, which are arranged on both sides of the window glass 4, sandwich the window glass 4, increasing the contact area between the through-hole 18 and the hole insertion portion 32.

[0041] 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.

[0042] 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. The hole insertion section 32 is formed with a ridge section 33 that fills the gap between the through hole 18. The ridge section 33 is formed around the entire outer periphery of the hole insertion section 32. The two flange sections 40 protrude radially outward from the main body 30 and are arranged on both sides of the double glass 11.

[0043] With this configuration, it is possible to provide a hole insertion portion 32 corresponding to each through hole 18. Therefore, a ridge portion 33 can be provided on the hole insertion portion 32 corresponding to the through hole 18 with the smallest diameter. The ridge portion 33 can reliably fill the gap between one through hole 18 (outer through hole 18a) of at least two through holes 18 with different diameters and the corresponding hole insertion portion 32 (outer hole insertion portion 32a). As a result, the sealing performance of the grommet 9 can be ensured even for insertion opening 14 formed by through holes 18 with different diameters.

[0044] Furthermore, the two flange portions 40 arranged 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.

[0045] A ridge portion 33 is formed on the hole insertion portion 32 corresponding to the through hole 18 with the smallest inner diameter. This makes it easier for the ridge portion 33 to come into contact with the inner peripheral surface of the through hole 18 with the smallest inner diameter among the through holes 18. As a result, it is easier to ensure sealing at a portion of the through hole 18 with a small opening area than at a portion of the through hole 18 with a large opening area. Furthermore, since the opening area of ​​the through hole 18 is small, there is no need to increase the outer diameter of the ridge portion 33. This further ensures sealing of the grommet 9.

[0046] A convex rib portion 33 is formed in the outer hole insertion portion 32a corresponding to the outer through-hole 18a located on the outermost side of the vehicle. Therefore, the convex rib portion 33 can fill the gap between the through-hole 18 located on the outer side of the vehicle, which is most susceptible to moisture and the like, and the hole insertion portion 32. As a result, moisture entering from outside the vehicle can be further prevented from entering the vehicle interior through the insertion opening 14.

[0047] Since only one ridge portion 33 is provided, the ridge portion 33 elastically deforms to fill the gap between the through hole 18 and the hole insertion portion 32. This increases the contact area between the through hole 18 and the hole insertion portion 32. This increases the surface pressure between the through hole 18 and the hole insertion portion 32. Furthermore, since the sealing performance of the grommet 9 can be ensured by providing only one ridge portion 33, the manufacturing cost of the grommet 9 can be reduced.

[0048] The outer flange portion 41 includes a lip portion 34 formed on its outer periphery. Each lip portion 34 has a tapered shape that gradually reduces in thickness as it extends radially outward. In its natural state, the lip portion 34 is curved back so that its tip 61 approaches the inner flange portion 42 as it extends radially outward. This allows the lip portion 34 to elastically deform, enhancing the adhesion between the outer glass 12 and the outer flange portion 41. This further ensures a tight seal. Furthermore, the lip portion 34's elastic deformation can accommodate variations in the thickness of the through-hole 18 in the double-glazed glass 11. The lip portion 34 ensures a tight seal, allowing the entire flange portion 40 to be thinned accordingly. Furthermore, the tip 61 of the lip portion 34 prevents the tip 61 from curling up, even when the vehicle 5 is subjected to high-pressure washing, ensuring a tight seal for the grommet 9.

[0049] 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.

[0050] 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."

[0051] (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).

[0052] 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, the grommet 209 includes a main body 230 that is inserted into the insertion opening 14 of the double glass 11, and two flanges 41, 42 that are connected to both axial ends of the main body 230. The configuration of the two flanges 41, 42 is the same as in the first embodiment, and therefore a description thereof will be omitted (the same applies to the third embodiment below).

[0053] The main body 230 includes hole insertion portions 232 provided on the outer peripheral surface of the main body 230. The hole insertion portions 232 are provided for each of the two through holes 18 and include two hole insertion portions 232a, 232b (outer hole insertion portion 232a, inner hole insertion portion 232b) formed with the same diameter. Of the two hole insertion portions 232, the outer hole insertion portion 232a inserted into the outer through hole 18a includes multiple (for example, three in the second embodiment) ridge portions 233 formed around the entire circumference of the outer peripheral surface. The ridge portions 233 are formed over the entire axial area of ​​the outer hole insertion portion 232a. The outer diameter of the ridge portions 233 is smaller than the outer diameter of the ridge portions 33 in the first embodiment.

[0054] Next, the function of the grommet 209 will be described. When the grommet 209 is inserted into the insertion opening 14, the ridges 233 are compressed in the diameter-reducing direction by the inner circumferential surface of the outer through-hole 18a at the insertion opening 14. This causes the ridges 233 of the grommet 209, which is a member with lower rigidity than the window glass 4, to elastically deform. The formation of three ridges 233 increases the surface area of ​​the ridges 233, thereby increasing the contact area between the ridges 233 and the outer-hole insertion portion 232a. This increases the surface pressure between the outer through-hole 18a and the outer-hole insertion portion 232a, including the ridges 233. Therefore, the ridges 233 fill the gap between the inner circumferential surface of the outer through-hole 18a and the outer-hole insertion portion 232a.

[0055] Therefore, the second embodiment described above has the same effects as the first embodiment described above. In addition, in the grommet 209 described above, the three ridges 233 are formed on the outer peripheral surface of the outer-hole insertion portion 232a, so that the gap between the outer through-hole 18a and the outer-hole insertion portion 232a can be filled more reliably.

[0056] In the second embodiment described above, the outer hole insertion portion 232a is formed with three ridge portions 233. However, this is not limited to this, and it is sufficient if a plurality of ridge portions 233 are formed. It is sufficient if the ridge portions 233 are formed over the entire axial area of ​​the outer hole insertion portion 232a.

[0057] (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.

[0058] The main body 330 includes a hole insertion portion 332 provided on the outer circumferential surface of the main body 330. The hole insertion portion 332 includes a plurality of (for example, four in the second embodiment) ridge portions 333 formed around the entire periphery of the outer circumferential surface. The ridge portions 333 are formed over the entire axial area of ​​the hole insertion portion 332. The ridge portions 333 have a pointed shape. More specifically, the cross-sectional shape of each ridge portion 333 along the axial direction is a triangle that tapers radially outward.

[0059] Next, the function of the grommet 309 will be described. When the grommet 309 is inserted into the insertion opening 14, the ridges 333 are compressed in the diameter-reducing direction by the inner circumferential surface of the outer through hole 18a at the insertion opening 14. This causes the ridges 333 of the grommet 309, which is a member with lower rigidity than the window glass 4, to elastically deform. Since four ridges 333 are formed, the surface area of ​​the ridges 333 increases, and the contact area between the ridges 333 and the hole insertion portion 332 increases. This increases the surface pressure between the outer through hole 18a and the hole insertion portion 332, including the ridges 333. Therefore, the ridges 333 fill the gap between the inner circumferential surface of the outer through hole 18a and the hole insertion portion 332.

[0060] Therefore, the third embodiment described above has the same effects as the first embodiment described above. In addition, in the grommet 309 described above, the ridge portions 333 are provided over the entire axial area of ​​the hole insertion portion 332. Since four ridge portions 333 are formed, the gap between the outer through hole 18a and the hole insertion portion 332 can be reliably filled. Furthermore, even when the insertion opening 14 slides in the axial direction, the four ridge portions 333 of the hole insertion portion 332 can more reliably fill the gap between the hole insertion portion 332 and the through hole 18.

[0061] In the third embodiment described above, the case where four ridge portions 333 are formed on the hole insertion portion 332 has been described. However, this is not limited to this, and it is sufficient that a plurality of ridge portions 333 are formed. It is sufficient that the ridge portions 333 are formed over the entire axial area of ​​the hole insertion portion 332.

[0062] (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 inner flange portion 42 in the first embodiment is different from the shape of the inner flange portion 442 in the fourth embodiment.

[0063] The grommet 409 includes a main body 430 and two flanges 440. The two flanges 440 extend radially outward from the main body 430 and are disposed on both sides of the double glass 11. The two flanges 440 include an outer flange 41 provided on the vehicle exterior side and an inner flange 442 provided on the vehicle interior side.

[0064] The inner flange portion 442 includes a curved portion 471 that curves gently axially inward along the inner glass, and a lip portion 435. The lip portion 435 is formed on the passenger compartment side and includes an inclined portion 470 that extends diagonally 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 in which the thickness gradually decreases radially outward. In its natural state, the lip portion 435 curves back so that the tip portion 472 approaches the outer flange portion 41 as it extends radially outward. The tip portion 472 is located radially inward of the tip portion 61 of the lip portion 34.

[0065] Next, the function of the grommet 409 will be described. When the grommet 409 is inserted into the insertion opening 14, the tip 472 of the lip portion 435 is compressed by the surface of the inner glass 13. This causes the lip portion 435, which is a member with lower rigidity than the inner glass 13, to elastically deform, increasing the contact area between the surface of the inner glass 13 and the curved portion 471 and tip 472 of the lip portion 435. As a result, the gap between the surface of the inner glass 13 and the lip portion 435 is filled, and the inner flange portion 442 clamps the window glass 4.

[0066] A lip portion 435 is formed on the inner flange portion 442. The lip portion 435 has a tapered shape that gradually becomes thinner as it extends radially outward. In its natural state, the lip portion 435 is curved back so that a tip portion 472 approaches the outer flange portion 41 as it extends radially outward.

[0067] Therefore, the fourth embodiment described above has the same effects as the first embodiment. In addition, by providing the lip portion 435 on the inner flange portion 442, the inner flange portion 442 and the inner glass 13 can be tightly attached to each other. This allows the rigidity of the inner flange portion 442 to be reduced so that the inclined portion 470 can be formed on the inner flange portion 442 (lip portion 435).

[0068] The inclined portion 470 of the lip portion 435 allows for a larger space on the passenger compartment side, ensuring clearance with the vehicle body panel. The lip portion 435 also elastically deforms to better accommodate variations in the thickness of the through-hole 18 in the double-glazed glass 11. Furthermore, by providing the lip portion 34 on the outer flange portion 41 and the lip portion 435 on the inner flange portion 442, the clamping force for the window glass 4 can be increased. This allows for a localized increase in the clamping force for the window glass 4, ensuring a tight seal for the grommet 9 even when the insertion opening 14 has a step.

[0069] In the above-described fourth embodiment, the inner flange portion 442 is described as including the lip portion 435. However, this is not limited thereto, and the lip portion 435 may be formed on the inner flange portion 42. The ridge portions 33, 233, 333 may be formed on the hole insertion portion 32 that is inserted into one of the plurality of through holes 18 that form the insertion opening 14. Desirably, at least one ridge portion is formed on the hole insertion portion 32, 232, 332 that corresponds to the through hole 18 with the smallest hole diameter. In this case, a plurality of ridge portions 33, 233, 333 may be provided.

[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 this is not limiting, and the wiper device 6 may be attached to the window glass of a two-wheeled vehicle such as a scooter. In the above embodiment, the case where two through holes 18 are formed in the window glass 4 has been described. However, this is not limited to this, and the number of through holes 18 formed in the window glass 4 may be at least two, and may be three or more. 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]

[0072] 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 portion, 16...fixing portion main body, 17...insertion hole, 18...through hole, 18a...outer through hole, 18b...inner through hole, 20...arm support portion, 21...upper surface plate, 22...side surface plate, 23...rear surface plate, 25...wiper, 30...main body portion, 32...hole insertion portion, 32a...outer hole insertion portion, 32b...inner hole insertion portion, 33...ridge portion, 34...lip portion, 40...flange portion, 41... Outer flange portion, 41a...outer flat surface, 41b...inner flat surface, 42...inner flange portion, 42a...outer flat surface, 42b...inner 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, 60...inclined portion, 61...tip portion, 209...grommet, 230...main body portion, 232...hole insertion portion, 232a...outer hole insertion portion, 232b...inner hole insertion portion, 233...convex rib portion, 309...grommet, 330...main body portion, 332...hole insertion portion, 333...convex rib portion, 409...grommet, 430...main body portion, 440...flange portion, 442...inner flange portion, 470...inclined portion, 471...curved portion, 472...tip portion

Claims

1. a cylindrical main body portion that is inserted into an insertion port formed in the attachment object; Two flange portions connected to both axial ends 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; One of the hole insertion portions has a protruding portion formed around the entire outer periphery of the hole insertion portion and filling a gap between the corresponding through hole. A grommet characterized by:

2. The hole insertion portion corresponding to the through hole with the smallest inner diameter among the through holes includes the ridge portion.

2. The grommet according to claim 1.

3. The attachment object is a part of a vehicle, The hole insertion portion corresponding to the through hole arranged on the outermost side of the vehicle among the through holes includes the protruding rib portion.

2. The grommet according to claim 1.

4. Only one protruding portion is provided.

2. The grommet according to claim 1.

5. A plurality of the ridge portions are provided, and each of the ridge portions is provided over the entire area of ​​the hole insertion portion in the axial direction.

2. The grommet according to claim 1.

6. The two flange portions 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 grommet according to any one of claims 1 to 6; 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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