JP2018144565A - Grommet and vehicle wiper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet that is able to maintain sealability between a sealing part and the outer peripheral surface of a drive shaft.SOLUTION: A grommet comprises: a body part 21 comprising: a part 23 to be mounted in an insertion hole RG1 formed in a rear glass RG; a flexible part 24 whose one-end side is continuously flexible from the part 23; a cylindrical part 25 extending from the other end of the flexible part 24 and partially covering an axial direction of a drive shaft 13; and a sealing part 32 formed on at least part of an inner peripheral surface 25a of the cylindrical part 25 and abutting on an outer peripheral surface 13e of the drive shaft 13; and a bearing member 22 formed from a material harder than at least the sealing part 32, fitted in the cylindrical part 25 and externally placed on the drive shaft 13, the inner peripheral surface 22a of the bearing member abutting on the outer peripheral surface 13e of the drive shaft 13.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a grommet and a vehicle wiper device.

2. Description of the Related Art Conventionally, there is a vehicle wiper device that is provided at a rear portion of a vehicle and wipes off water droplets such as raindrops attached to a rear glass (see, for example, Patent Document 1).
Such a vehicle wiper device, for example, rotates a drive shaft of a drive source projecting outside from an insertion hole provided in a vehicle body panel or a rear glass, and swings a wiper attached to the drive shaft on the rear glass. It is designed to be wiped off.

By the way, a grommet is attached to the insertion hole through which the drive shaft projects so as to prevent water from entering between the drive shaft and the inner peripheral surface of the insertion hole.
For example, in a grommet used in a vehicle wiper device disclosed in Patent Document 1, a seal portion (inner annular lip in Patent Document 1) abuts (slidably contacts) an inner peripheral surface of a cylindrical portion that covers a part of a drive shaft. Thus, intrusion of water or the like from between the outer peripheral surface of the drive shaft and the inner peripheral surface of the cylindrical portion is suppressed.

JP 2008-137509 A

  However, when the drive shaft receives a load in the radial direction of the drive shaft due to shaking or the like, the seal portion receives a force, so that the seal portion is greatly elastically deformed and the outer peripheral surface of the drive shaft and the seal portion are There is a possibility that the sealing performance between them cannot be maintained.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a grommet and a vehicle wiper device that can maintain the sealing performance between the seal portion and the outer peripheral surface of the drive shaft. is there.

  A grommet that solves the above problems includes a mounting portion that is attached to an insertion hole formed in a vehicle body panel or a windshield, a flexible portion having one end side continuous from the mounting portion, and the flexible portion. A cylindrical portion that extends from the other end of the portion and partially covers the axial direction of the drive shaft that drives the wiper, and an outer peripheral surface of the drive shaft that is formed on at least a part of the inner peripheral surface of the cylindrical portion. And a support member that is made of a material harder than at least the seal portion, is fitted into the cylindrical portion, and is externally inserted into the drive shaft.

  According to this configuration, since the support member is fitted into the cylindrical portion and is externally inserted into the drive shaft, the support member can receive a radial load associated with the swing of the drive shaft, and the seal portion. The sealability between the outer peripheral surface of the drive shaft can be maintained.

In the grommet, it is preferable that the support member is provided on the flexible portion side which is one end side in the axial direction from the seal portion.
According to this configuration, since the support member is provided on the flexible portion side that is one axial end side of the seal portion, the load in the radial direction of the drive shaft received by the support member is transmitted to the flexible portion side. Therefore, transmission to the seal portion is suppressed and the sealing performance can be maintained. And since a seal | sticker part will be located outside a support member, invasion of water is suppressed to the support member side.

In the grommet, the support member is preferably provided on the side opposite to the flexible portion, which is the other axial end side than the seal portion.
According to this configuration, since the support member is provided on the anti-flexible portion side, which is the other axial end side from the seal portion, it is possible to suppress the load in the radial direction of the drive shaft from being transmitted to the seal portion, and the sealing performance. Can be maintained.

In the grommet, the support member is preferably provided on both sides in the axial direction of the seal portion.
According to this configuration, by providing support members on both sides in the axial direction of the seal portion, the load on the radial direction of the drive shaft is received by the support members on both sides in the axial direction, and transmission to the seal portion is suppressed, thereby maintaining the sealing performance. can do.

In the grommet, the support member is preferably made of a resin material.
According to this configuration, by configuring the support member with a resin material, it is possible to reduce sound (for example, contact sound such as sliding sound) that can be generated when the drive shaft comes into contact with the support member.

In the grommet, it is preferable that an outer peripheral surface of the support member and an inner peripheral surface of the cylindrical portion are bonded.
According to this structure, it can suppress that a supporting member spaces apart from the internal peripheral surface of a cylindrical part by adhere | attaching the outer peripheral surface of a support member, and the internal peripheral surface of a cylindrical part. Moreover, it can suppress sliding with the internal peripheral surface of a cylindrical part, and the outer peripheral surface of a supporting member.

The said grommet WHEREIN: It is preferable that the said cylindrical part has a contact surface which contact | abuts the said support member on both sides of an axial direction.
According to this configuration, the displacement of the support member in the axial direction can be suppressed by having the contact surfaces that contact the support member on both sides in the axial direction.

  A grommet that solves the above-described problem includes a mounted portion that is attached to an insertion hole formed in a vehicle body panel or a windshield, a flexible portion having one end side continuously flexible from the mounted portion, and the movable portion. A cylindrical portion that extends from the other end of the flexible portion and partially covers the axial direction of the drive shaft that drives the wiper, and an outer peripheral surface of the drive shaft that is formed on at least a part of the inner peripheral surface of the cylindrical portion A main body provided with a seal portion that abuts with the outer peripheral surface of the cylindrical portion and the inner periphery of the cylindrical portion in a state of being externally fitted to the cylindrical portion. And a holding member that holds the seal portion in contact with the outer peripheral surface of the drive shaft.

  According to this configuration, since the seal portion is held in contact with the outer peripheral surface of the drive shaft by the holding member fitted on the cylindrical portion, the seal portion can be prevented from being deformed, so that the sealing performance is maintained. can do.

  In addition, a vehicle wiper device that solves the above-described problem includes a drive source that rotationally drives a drive shaft, and a wiper that is coupled to the drive shaft. The described grommet is attached.

  According to this structure, the wiper device for vehicles which can maintain the sealing performance between the seal part in a grommet and the outer peripheral surface of a drive shaft can be provided.

  In addition, a vehicle wiper device that solves the above problem includes a drive source that rotationally drives a drive shaft having a regulation step portion having a different outer diameter in the axial direction, and a wiper coupled to the drive shaft, the drive shaft The grommet according to any one of the above is attached between the insertion member and the insertion hole, and the restriction step portion of the drive shaft is in contact with one end surface of the support member in the axial direction.

  According to this configuration, the support member of the grommet is in contact with the restriction step portion of the drive shaft, so that the support member can be restricted from moving toward the one end surface in the axial direction. Thereby, the axial direction position of the support member can be stabilized, and the drop-off from the grommet can be suppressed.

  According to the grommet and the vehicle wiper device of the present invention, the sealing performance between the seal portion and the outer peripheral surface of the drive shaft can be maintained.

1 is a schematic configuration diagram of a vehicle wiper device according to an embodiment. Sectional drawing of the grommet in the embodiment. Sectional drawing of the grommet in a modification. Sectional drawing of the grommet in a modification. The front view of the grommet in a modification. 6-6 sectional drawing in FIG. 7-7 sectional drawing in FIG.

Hereinafter, an embodiment of a vehicle wiper device will be described.
As shown in FIG. 1, the vehicle wiper device 10 is mounted on a vehicle door such as a back door provided at the rear end of the vehicle. The vehicle door has an outer panel (not shown) that forms an outer shape thereof, an inner panel (not shown) that is disposed on the inner side (vehicle interior side) of the outer panel with a predetermined gap between the outer panel, And a rear glass RG as a windshield supported by the outer panel and the inner panel. A wiper motor 11 as a drive source of the vehicle wiper device 10 accommodated between the inner panel and the outer panel is fixed to the inner panel.

  The wiper motor 11 is configured by integrally assembling a motor main body 12 and a speed reduction portion 14 that houses a link mechanism and a speed reduction mechanism for converting the rotational motion of the motor main body 12 into the rotational motion of the drive shaft 13.

  The drive shaft 13 is made of a metal material and is configured to protrude outward from the vehicle compartment from a circular insertion hole RG1 formed in the rear glass RG. The drive shaft 13 includes a large diameter shaft portion 13a, a small diameter shaft portion 13b, and a wiper fixed shaft portion 13c.

The large-diameter shaft portion 13a is positioned on one end side (the speed reduction portion 14) side of the drive shaft 13 in the axis L direction, and is configured to have a substantially cylindrical shape.
The small-diameter shaft portion 13b has a substantially cylindrical shape, and is provided so as to extend on the coaxial line L with the large-diameter shaft portion 13a from the tip of the large-diameter shaft portion 13a. The small-diameter shaft portion 13b has a diameter smaller than that of the large-diameter shaft portion 13a. Thereby, the regulation step part 13d is provided in the boundary part of the large diameter shaft part 13a and the small diameter shaft part 13b.

The wiper fixing shaft portion 13c is provided so as to extend on the coaxial line L from the tip of the small diameter shaft portion 13b, and the wiper W is attached. The wiper W includes a wiper arm that is fastened to the wiper fixing shaft portion 13c, and a wiper blade that is rotatably connected to the tip of the wiper arm.
Further, as shown in FIGS. 1 and 2, the insertion hole RG1 seals between the inner peripheral surface of the insertion hole RG1 and the drive shaft 13 to prevent water from entering the vehicle door. Grommet 20 is attached.

The grommet 20 includes a main body portion 21 and a bearing member 22 as a support member.
The main body 21 is made of a rubber material (for example, ethylene propylene diene rubber: EPDM). The main body 21 is formed in a substantially cylindrical shape so that the drive shaft 13 can be inserted therethrough.

As shown in FIG. 2, the main body portion 21 includes a mounted portion 23, a flexible portion 24, and a tubular portion 25.
The attached portion 23 has a substantially annular shape, and has a groove portion 23a that has a concave shape radially inward along the circumferential direction on the outer peripheral surface thereof. A rear glass RG (insertion hole RG1) is fitted into the groove 23a. Thereby, the main body 21 (grommet 20) is attached to the insertion hole RG1. Although not shown, a protrusion extending toward the rear glass RG may be provided on the entire circumference of the surface of the groove 23a that contacts the rear glass RG. When the protrusions are in close contact with the rear glass RG, the intrusion of water from between the rear glass RG (insertion hole RG1) and the attached portion 23 is prevented.

  The flexible portion 24 is configured such that one end portion side is continuous from the attached portion 23 and the cross section has a bellows shape and has flexibility. The flexible portion 24 is formed to have a bellows-like cross section so as to allow bending of the drive shaft 13 based on the mounting posture of the wiper motor 11 to the vehicle and to allow the drive shaft 13 to sway.

The cylindrical portion 25 has a substantially cylindrical shape continuously from the other end side of the flexible portion 24, and has a bearing holding portion 31 and a seal portion 32 on the inner peripheral surface 25a.
The bearing holding portion 31 is an annular groove portion having a concave shape radially outward, and the bearing member 22 is fitted therein. The bearing holding portion 31 has a radially inner surface 31a that faces radially inward and contacts the bearing member 22 in the radial direction, and two axial contacts that contact the bearing member 22 in the axial L direction from both sides in the axial L direction. And a surface 31b. The radially inner side surface 31 a also serves as the inner peripheral surface 25 a of the cylindrical portion 25.

  The seal portion 32 has two annular protrusions 32a that form an annular shape so as to protrude radially inward from the inner peripheral surface 25a on the distal end side of the cylindrical portion 25. The inner diameter of the annular protrusion 32 a is set to be slightly smaller than the diameter of the small diameter shaft portion 13 b of the drive shaft 13. That is, when the drive shaft 13 is inserted into the cylindrical portion 25, each annular protrusion 32a is slightly extended in the radial direction and deformed, and the outer peripheral surface 13e of the small-diameter shaft portion 13b of the drive shaft 13 by its restoring force. It comes to adhere to. Therefore, infiltration of water from between the grommet 20 and the drive shaft 13 is prevented.

  The bearing member 22 is configured to have an annular shape and is extrapolated to the small diameter shaft portion 13 b of the drive shaft 13. The diameter of the inner peripheral surface 22a of the bearing member 22 is configured to be substantially equal to the diameter of the outer peripheral surface 13e of the small diameter shaft portion 13b. The bearing member 22 is made of a resin material harder than the main body portion 21, that is, the seal portion 32.

  The outer peripheral surface 22 b of the bearing member 22 is bonded to the radially inner side surface 31 a of the bearing holding portion 31. More specifically, the outer peripheral surface 13e of the bearing member 22 is in contact with the radially inner side surface 31a of the bearing holding portion 31 via an adhesive. Thereby, it is suppressed that the bearing member 22 moves to the axis line L direction.

  Further, the bearing member 22 of the present embodiment is in contact with the regulation stepped portion 13d of the drive shaft 13 in the axis L direction in a state where the drive shaft 13 is inserted inside, that is, in a state where the drive shaft 13 is externally inserted. Movement in the direction of the axis L is restricted.

Next, the operation of the vehicle wiper device will be described.
The grommet 20 of the vehicle wiper device 10 of the present embodiment inserts the attached portion 23 into the insertion hole RG1 from the outside of the rear glass RG, and fits the rear glass RG into the groove portion 23a of the attached portion 23, thereby rear glass RG. Is mounted against.

  Further, in the grommet 20 of the present embodiment, a bearing member 22 that is harder than the main body portion 21 (seal portion 32) is fitted into a cylindrical portion 25 provided with the seal portion 32, and the bearing member 22 is connected to the drive shaft 13 (small diameter). The shaft portion 13b is in contact with the shaft portion 13b). Thereby, for example, when a load is received in the radial direction of the drive shaft 13 due to the swing of the drive shaft 13 or the like, a load (force) may be applied to the seal portion 32 by the bearing member 22 receiving the load. It is suppressed.

Further, since the bearing member 22 is provided at a position closer to the flexible portion 24 than the seal portion 32, the load received by the bearing member 22 is absorbed by elastic deformation of the flexible portion 24.
Next, the effect of this embodiment will be described.

  (1) Since the bearing member 22 comes into contact with the outer peripheral surface 13e of the drive shaft 13 and comes into contact with the radial inner side surface 31a constituting the inner peripheral surface 25a of the cylindrical portion 25, the radial direction accompanying the vibration of the drive shaft 13 and the like Can be received by the bearing member 22, and the sealing performance between the seal portion 32 and the outer peripheral surface 13e of the drive shaft 13 can be maintained.

  (2) Since the bearing member 22 is provided on the flexible portion 24 side that is one axial end side of the seal portion 32, the radial load of the drive shaft 13 received by the bearing member 22 is transmitted to the flexible portion 24 side. Therefore, transmission to the seal portion 32 is suppressed and the sealing performance can be maintained. And since the seal | sticker part 32 will be located outside the bearing member 22, permeation of water is suppressed to the bearing member 22 side.

(3) By configuring the bearing member 22 with a resin material, it is possible to reduce sliding noise that may be generated when the drive shaft 13 rotates.
(4) By bonding the outer peripheral surface 22b of the bearing member 22 and the radial inner side surface 31a constituting the inner peripheral surface 25a of the cylindrical portion 25, the inner peripheral surface 25a (the radial inner side surface 31a of the cylindrical portion 25). ) From the bearing member 22 can be suppressed. Further, sliding between the inner peripheral surface 25a of the cylindrical portion 25 and the outer peripheral surface 22b of the bearing member 22 can be suppressed.

(5) The cylindrical portion 25 has the contact surfaces 31b that contact the bearing member 22 on both sides in the axial direction, thereby suppressing displacement of the bearing member 22 in the axis L direction.
(6) The bearing member 22 of the grommet 20 abuts on the regulation stepped portion 13d of the drive shaft 13 in the axis L direction, so that the bearing member 22 can be restricted from moving toward one end surface in the axis L direction. Thereby, the axial direction position of the bearing member 22 can be stabilized, and dropping off from the grommet 20 (main body portion 21) can be suppressed.

In addition, you may change the said embodiment as follows.
In the above embodiment, the bearing member 22 is disposed on the flexible portion 24 side of the seal portion 32. However, the present invention is not limited to this.

  As shown in FIG. 3, the bearing member 22 may be provided on the side opposite to the flexible portion 24 from the seal portion 32, that is, at a position farther from the flexible portion 24 than the seal portion 32 in the axis L direction. . By setting it as such a structure, it can suppress that the load to the radial direction of the drive shaft 13 is transmitted to the seal part 32, and can maintain sealing performance.

  As shown in FIG. 4, the bearing member 22 may be disposed on both sides of the seal portion 32 in the axis L direction of the drive shaft 13. As described above, by providing the bearing members 22 on both sides in the axial direction of the seal portion 32, it is possible to prevent the bearing members 22 on both sides in the axis L direction from receiving a load in the radial direction of the drive shaft 13 and being transmitted to the seal portion 32. Sealability can be maintained.

  In the above embodiment, the bearing member 22 as the support member is fitted into the cylindrical portion 25 of the main body portion 21 and the bearing member 22 receives the load in the radial direction. Although it was set as the structure which suppresses transmission of a load, it is not restricted to this. For example, the configuration shown in FIGS. 5 to 7 can be employed. In addition, in the structure shown in FIGS. 5-7, an example of a holding member is shown.

As shown in FIGS. 5 to 7, the grommet 20 has a cover 41 as a holding member that is fitted onto the cylindrical portion 25 of the main body portion 21.
As shown in FIG. 7, the cover 41 is configured to have a so-called bottomed cylindrical shape having a cylindrical portion 42 and a bottom portion 43 on one side in the axis L direction of the cylindrical portion 42. The cover 41 is configured such that the tubular portion 25 is inserted into the cover 41 from the opening 42 a side on the other side in the axis L direction of the tubular portion 42. The cover 41 is made of a resin material that is harder than the material constituting the main body portion 21 (the seal portion 32).

  As shown in FIG. 7, a through hole 43 a through which the drive shaft 13 can be inserted is formed in the bottom 43 of the cover 41. The inner diameter of the through-hole 43a is larger than the diameter of the drive shaft 13 (in this example, the diameter of the small-diameter shaft portion 13b), and the drive shaft 13 (small-diameter shaft portion 13b) and the cover 41 (the inner peripheral surface of the through-hole 43a). They are separated in the radial direction. In other words, a gap is provided between the outer peripheral surface of the drive shaft 13 (small-diameter shaft portion 13b) and the inner peripheral surface of the through hole 43a.

  As shown in FIG. 7, the bottom portion 43 of the cover 41 has a first bottom surface 43b and a second bottom surface 43c. The first bottom surface 43b has a shape that is recessed in the direction of the axis L than the second bottom surface 43c. Further, the bottom portion 43 of the cover 41 is formed such that the first bottom surface 43b and the second bottom surface 43c alternate in the circumferential direction. The first bottom surface 43b is separated from the distal end surface 25c of the cylindrical portion 25 in the axis L direction, and the second bottom surface 43c is in contact with the distal end surface 25c of the cylindrical portion 25 in the axis L direction. In other words, the cover 41 is externally fitted to the cylindrical portion 25 so as to have a gap between the first bottom surface 43 b and the tip end surface 25 c of the cylindrical portion 25.

  As shown in FIGS. 6 and 7, the cylindrical portion 42 is provided on the inner peripheral surface thereof so that the radial protrusions 42 b and the radial groove portions 42 c are alternately arranged in the circumferential direction. Each radial protrusion 42b protrudes radially inward and is formed along the axis L direction. Each radial protrusion 42 b is in contact with the outer peripheral surface 25 b of the cylindrical portion 25 of the main body 21 in the radial direction at the radial inner surface, which is the tip surface. Thereby, the state in which the cover 41 fitted the cylindrical part 25 of the main-body part 21 is hold | maintained. Then, the radial protrusion 42 b of the cover 41 restricts deformation of the tubular portion 25 (seal portion 32) toward the radially outer side, and the seal portion 32 is held in contact with the drive shaft 13. As described above, since the seal portion 32 is held in contact with the outer peripheral surface 13e of the drive shaft 13 by the cover 41 as a holding member fitted on the cylindrical portion 25, deformation of the seal portion 32 can be suppressed. Therefore, sealing performance can be maintained.

  The radial groove portion 42c is a groove having a concave shape on the radially inner side, and is formed along the axis L direction. The radial groove 42c is located radially outside the radial protrusion 42b and is separated from the outer peripheral surface 25b of the cylindrical portion 25. In other words, a gap is provided between the radial groove portion 42 c and the outer peripheral surface 25 b of the cylindrical portion 25. Moreover, since the radial groove part 42c corresponds with the 1st bottom face 43b of the bottom part 43 in the circumferential direction, the 1st bottom face 43b and the radial groove part 42c are spaced apart from the main-body part 21 (tubular part 25). It becomes. Here, as described above, the through hole 43a is configured to be separated from the drive shaft 13 in the radial direction. For this reason, when water or the like enters from the through hole 43a, it can be discharged to the outside through the first bottom surface 43b and the radial groove portion 42c.

  In the above embodiment, the seal portion 32 includes the two annular protrusions 32a that are formed on the inner peripheral surface 25a on the distal end side of the tubular portion 25, but is not limited thereto. For example, it is good also as a structure which has three or more annular protrusions 32a. Moreover, it is good also as a structure which has only one cyclic | annular protrusion 32a.

In the above embodiment, the outer peripheral surface 22b of the bearing member 22 is bonded to the radially inner side surface 31a of the bearing holding portion 31, but the present invention is not limited thereto.
For example, the configuration may be such that the outer peripheral surface 22 b of the bearing member 22 is in contact with the radially inner side surface 31 a of the bearing holding portion 31.

  The bearing member 22 may be bonded to the axial contact surface 31 b of the bearing holding portion 31. More specifically, the axis L direction surface of the bearing member 22 is configured to contact each axial contact surface 31b of the bearing holding portion 31 via an adhesive.

  Further, the outer peripheral surface 22b of the bearing member 22 may not contact the radial inner side surface 31a of the bearing holding portion 31, that is, a gap or another member may be interposed between the outer peripheral surface 22b and the radial inner side surface 31a. When a gap is provided between the outer peripheral surface 22b and the radial inner side surface 31a, the radial separation distance (the radial length of the gap) between the outer peripheral surface 22b and the radial inner side surface 31a can be set as appropriate. However, for example, it is preferable to be shorter than the radial length (protrusion amount) of the annular protrusion 32a of the seal portion 32. With such a configuration, the outer peripheral surface 22b of the bearing member 22 and the radially inner side surface 31a of the bearing holding portion 31 are brought into contact with each other before the seal portion 32 is largely deformed, and the load in the radial direction of the drive shaft 13 is applied. It can be received by the bearing member 22, and a load (force) on the seal portion 32 can be suppressed.

  In the above embodiment, the grommet 20 has a bearing member 22 that is harder than the main body portion 21 (seal portion 32) fitted in a cylindrical portion 25 that includes the seal portion 32, and the bearing member 22 has a drive shaft 13 (small diameter). The shaft portion 13b) is in contact with the shaft portion 13b), but is not limited thereto. For example, it is good also as a structure which provided the clearance gap between the bearing member 22 and the drive shaft 13 (small diameter shaft part 13b). In other words, the inner diameter of the bearing member 22 may be set to be slightly larger than the outer diameter of the drive shaft 13 (small diameter shaft portion 13b). In the above configuration, when a load is received in the radial direction of the drive shaft 13 due to the swing of the drive shaft 13 or the like, the bearing member 22 comes into contact with the bearing member 22 before the seal portion 32 is largely deformed. Can receive the load, and it is suppressed that the load (force) with respect to the seal part 32 is applied. Note that sliding noise between the drive shaft 13 and the bearing member 22 can be suppressed as compared with the configuration in which the drive shaft 13 (small-diameter shaft portion 13b) and the bearing member 22 are always in contact with each other.

  In the above embodiment, the bearing member 22 is made of a resin material. However, the present invention is not limited to this and may be made of a metal material. The material which comprises the bearing member 22 should just be harder than the material which comprises the main-body part 21 of the grommet 20.

  In the above embodiment, the bearing member 22 is configured to have an annular shape, but is not limited thereto. For example, the bearing member 22 may have a C-shaped cross section.

  In the above embodiment, the grommet 20 is provided between the insertion hole RG1 formed in the rear glass RG and the drive shaft 13, but the present invention is not limited thereto. For example, it is good also as a structure provided between the penetration hole formed in the vehicle body panel (outer panel) and the drive shaft 13. FIG.

  In the above embodiment, the grommet 20 is applied to the vehicle wiper device 10 provided at the rear of the vehicle. However, the grommet 20 is attached to the vehicle wiper device that wipes the windshield (front glass) at the front of the vehicle. A configuration may be adopted. In this case, the insertion hole through which the drive shaft 13 is inserted is formed in the windshield (front glass) in the front part of the vehicle or the vehicle body panel (cowl top panel) in the front part of the vehicle.

  In the above embodiment, the flexible portion 24 has a bellows shape and has a flexible structure, but is not limited thereto. For example, it is good also as a structure which has flexibility by making the flexible part 24 into a thin wall shape compared with another part.

  -You may combine the said embodiment and each modification suitably.

  DESCRIPTION OF SYMBOLS 10 ... Wiper apparatus for vehicles, 13 ... Drive shaft, 13d ... Restriction level | step difference part, 13e ... Outer peripheral surface, 20 ... Grommet, 21 ... Main-body part, 22 ... Bearing member (support member), 22a ... Inner peripheral surface, 22b ... Outer periphery Surface, 23 ... attached portion, 24 ... flexible portion, 25 ... cylindrical portion, 25a ... inner peripheral surface, 25b ... outer peripheral surface, 31a ... radial inner side surface (inner peripheral surface), 31b ... axial contact surface (Contact surface), 32 ... seal part, 41 ... cover (holding member), RG ... rear glass (wind shield), RG1 ... insertion hole, W ... wiper.

Claims (10)

A mounted portion that is attached to an insertion hole formed in the vehicle body panel or the windshield;
A flexible part having one end side continuously flexible from the attached part;
A cylindrical portion extending from the other end of the flexible portion and partially covering the axial direction of the drive shaft that drives the wiper;
A seal portion that is formed on at least a portion of the inner peripheral surface of the cylindrical portion and that contacts the outer peripheral surface of the drive shaft;
A main body with
A support member that is made of a material harder than at least the seal portion, is fitted into the cylindrical portion, and is externally inserted into the drive shaft;
Grommet characterized by having. The grommet according to claim 1,
The grommet characterized in that the support member is provided on the flexible part side which is one axial end side of the seal part. The grommet according to claim 1,
The grommet according to claim 1, wherein the support member is provided on an anti-flexible portion side which is the other axial end side of the seal portion. The grommet according to claim 1,
The grommet, wherein the support member is provided on both axial sides of the seal portion. In the grommet according to any one of claims 1 to 4,
The grommet wherein the support member is made of a resin material. In the grommet according to any one of claims 1 to 5,
The grommet characterized in that an outer peripheral surface of the support member and an inner peripheral surface of the cylindrical portion are bonded. In the grommet according to any one of claims 1 to 6,
The said cylindrical part has a contact surface which contact | abuts the said supporting member on both sides of an axial direction, The grommet characterized by the above-mentioned. A mounted portion attached to an insertion hole formed in the vehicle body panel or the windshield,
A flexible part having one end side continuously flexible from the attached part;
A cylindrical portion extending from the other end of the flexible portion and partially covering the axial direction of the drive shaft that drives the wiper;
A seal portion that is formed on at least a portion of the inner peripheral surface of the cylindrical portion and that contacts the outer peripheral surface of the drive shaft;
A main body with
The seal portion is made of a material harder than the seal portion, and the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the cylindrical portion abut on the outer periphery of the drive shaft while being fitted on the cylindrical portion. A holding member that holds the surface in contact with the surface;
Grommet characterized by having. A drive source for rotating the drive shaft;
A wiper coupled to the drive shaft;
With
A vehicular wiper device, wherein the grommet according to any one of claims 1 to 8 is attached between the drive shaft and the insertion hole. A drive source for rotationally driving a drive shaft having a regulation step portion having a different outer diameter in the axial direction;
A wiper coupled to the drive shaft;
With
The grommet according to any one of claims 1 to 7 is attached between the drive shaft and the insertion hole,
The vehicle wiper device, wherein the restriction step portion of the drive shaft is in contact with one end surface of the support member in the axial direction.

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