JPH0651031U - Waterproof structure of pivot shaft - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to reduce the number of components and ensure the waterproof performance, and it can be commonly used even when the pivot shaft angle is set and the pivot shaft is different The purpose is to provide a rich and inexpensive waterproof structure of the pivot shaft. [Structure] The waterproof member 10 has a cap structure made of an elastic member such as rubber, and has a hollow cylindrical shaft guard portion 12, an attachment portion 13 to the vehicle outer plate 5, and the attachment portion 13. The shaft guard portion 12 is provided with a connecting portion 14 for connecting the shaft guard portion 12 with a play and a lip portion 11 formed inside the upper portion of the shaft guard portion 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a waterproof structure for a pivot shaft of a vehicle wiper.

[0002]

[Prior art]

 In general, a pivot shaft of a vehicle wiper device has a wiper arm fixed to a tip end side extending from the vehicle body side to the outside, and connected to a link arm or an output shaft of a wiper motor on the base end side. The wiper motor is driven to rotate the pivot shaft, and this rotation causes the wiper arm to reciprocally swing to wipe the glass surface.

For this reason, although waterproof measures are taken between the vehicle body side and the pivot shaft, various techniques have been conventionally proposed for the waterproof structure of the pivot shaft. For example, a technique of forming a cap-shaped waterproof cylindrical wall and an inner wall on a support for a wiper arm for waterproofing (see, for example, Japanese Utility Model Laid-Open No. 1-172950), a substantially umbrella-shaped pivot cap, a so-called cover. A technique of mounting a type (see, for example, Japanese Utility Model Laid-Open No. 4-51854), a skirt portion having a trapezoidal cross section and a thin hem portion extending from a base end portion engaged and held on a vehicle body side to a tip end side of a pivot shaft, and an upper surface of the hem portion. A so-called grommet-type technology (for example, Japanese Utility Model Laid-Open No. 1-148959) in which a cylindrical portion protruding toward the base end side of the pivot shaft and a lip portion arranged on the inner peripheral surface of the cylindrical portion and slidingly contacting the pivot shaft are formed. (Refer to the public report), the outer protrusion of the pivot holder integrally has an annular lip that presses against the outer panel, and the opening formed in the outer panel is pressed by the annular lip to close it. A technique using a panel seal member made of an elastic material (see, for example, Japanese Utility Model Laid-Open No. 62-156570) is known.

[0004]

[Problems to be solved by the device]

 In the technology (above technology) of forming a cap-shaped waterproof cylinder wall and inner wall on the support for the wiper arm to prevent water (the above technology), the gap between the waterproof cylinder wall of the wiper arm support and the outer periphery of the pivot is kept optimal. Therefore, it is necessary to set the collar for mounting the holder and the length of the waterproof cylinder wall of the support for each pivot axis according to the pivot axis length and the angle of the axis.

In addition, in the technique of attaching a so-called cover type pivot cap with a substantially umbrella-shaped open hem edge (the above technique), it is necessary to keep the gap between the cap and the shaft outer plate optimal, and therefore Similar to the technology, it is necessary to set the cap length and the angle of its end face for each pivot axis.

Further, in the grommet type technology (the above-mentioned technology), it is necessary to set the cap according to the inclination of the pivot shaft. If an inclined shaft is set forcibly, excessive stress will be applied to the sliding parts of the cap and shaft, and the lip part will be unevenly worn, impairing the waterproof property.

Further, in the technique using the panel seal member (the above technique), the annular lip portion needs to be formed in accordance with the length of the pivot shaft in order to press-contact the annular lip portion and the outer panel.

As described above, in the related art, it is necessary to provide a waterproof member adapted to the length of each pivot shaft. For example, in order to dispose the waterproof member on a long pivot shaft, a waterproof member such as a cap is required. Since the member is set according to the length of the pivot axis, or only the shaft is extended, the waterproof member will be worn due to the shaft being exposed to water or rust caused by water exposure There will be problems.

An object of the present invention is to provide a versatile and inexpensive pivot that can reduce the number of components and ensure the waterproof performance and can be commonly used even when the pivot shaft angle setting and the pivot shaft height are different. It is to provide a waterproof structure for the shaft.

[0010]

A waterproof structure for a pivot shaft according to the present invention includes a pivot shaft extending from a mounting hole of the pivot shaft formed in a vehicle outer plate to waterproof a pivot shaft connected to a wiper arm side. In a waterproof structure for waterproofing with a member, the waterproof member has a hollow tubular shaft guard portion, a mounting portion to a vehicle outer plate, and a flexible portion at the mounting portion and a lower position of the shaft guard portion. A connecting portion having play and a connecting portion, and a lip portion formed on an inner side of an upper portion of the shaft guard portion are provided, and the mounting hole and the mounting portion of the waterproof member are engaged with each other and the pivot portion is provided. It is characterized in that the shaft is inserted into the shaft guard portion.

Further, it is preferable that the connecting portion is formed in a bellows shape.

[0012]

[Action]

 According to the present invention, a waterproof member, a hollow tubular shaft guard portion, a mounting portion to a vehicle outer plate, and a flexible and playable connection between the mounting portion and a lower position of the shaft guard portion are provided. And a lip portion formed inside the upper portion of the shaft guard portion for engaging the mounting hole and the mounting portion of the waterproof member, and connecting the pivot shaft to the shaft. Since it is inserted into the guard part, the pivot shaft and the vehicle outer plate are waterproofed by the mounting part, and the pivot shaft can be waterproofed by the shaft guard part.

The waterproof member is versatile and can be commonly used depending on the length of the pivot shaft and the tilted state. That is, with respect to the inclination of the pivot shaft, by inserting the pivot shaft into the hollow shaft guard portion, the lip portion and the shaft guard portion of the waterproof member are inclined according to the inclination of the pivot shaft. This inclination can be dealt with without affecting the mounting portion by the connecting portion that is flexible and has a play and is connected.

Further, with respect to the pivot shafts having different lengths (heights) extending to the outside, for example, when the pivot shaft extends to the outside for a long time, the pivot shaft is inserted into the shaft guard portion of the waterproof member. However, since the upper end of the pivot shaft holder contacts the lower end of the shaft guard and pushes up the waterproof member to extend the play of the connecting part, the waterproof member expands and contracts at the connecting part even if the height of the pivot shaft changes. However, it is possible to always ensure the optimum clearance between the wiper arm head and the waterproof member.

[0015]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The parts, arrangements, etc. described below do not limit the present invention and can be variously modified within the scope of the present invention. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a sectional view of an essential part showing an example in which a pivot shaft is long, and FIG. 2 is an enlarged view of an essential part of FIG. 3 is a cross-sectional view of a main part similar to FIG. 1, showing an example in which the length of the pivot shaft is short.

Generally, in a vehicle wiper device, the pivot shaft 1 is arranged in a pivot shaft holder 2, and the tip end side of the pivot shaft 1 extends out from the pivot shaft holder 2. The pivot shaft 1 extends from the vehicle body side, and the tip end side of the pivot shaft 1 is fixed by an arm head 3 forming a wiper arm 6 and a mounting screw 4. The arm head 3 is formed with a recess 3a having a concave cross section and a through hole 3b through which the tip of the pivot shaft 1 penetrates. A link arm or an output shaft (not shown) of a wiper motor is connected to the base end side of the pivot shaft 1. Further, in FIG. 1, reference numeral 7 is an arm head cover, and reference numeral 8 is an arm spring.

As shown in FIGS. 1 and 2, the waterproof structure of the pivot shaft 1 according to the present embodiment is such that the pivot shaft holder 2 is inserted from the mounting hole 5a of the pivot shaft 1 formed in the vehicle outer plate 5 on the vehicle body side. The pivot shaft 1 provided is extended, and the pivot shaft 1 and the vehicle outer plate 5 are waterproofed by the waterproof member 10.

In the recess 3 a of the arm head 3 of this example, a lip portion 11 formed on the tip side of the waterproof member 10 described later is arranged so as to be located in the recess 3 a. When the depth of the recessed portion 3a of the arm head 3 and the length of the pivot shaft 1 are determined in advance, the upper end of a shaft guard portion 12, which will be described later, is located inside the recessed portion 3a as shown in FIG. A maze structure in which the upper end of 12 is not easily exposed to water is suitable.

The waterproof member 10 of this example has a cap structure composed of an elastic member such as rubber, and has a hollow cylindrical shaft guard portion 12, an attachment portion 13 to the vehicle outer plate 5, and the mounting portion. A connecting portion 14 that connects the attachment portion 13 and the shaft guard portion 12 with play having flexibility, and a lip portion 11 formed inside the upper portion of the shaft guard portion 12 are provided. .

A folded-back portion 12 a is formed at an upper end portion of the hollow tubular shaft guard portion 12 of this example, and a plurality of lip portions 11 are formed inside the shaft guard portion 12. The lip portion 11 of this example is formed at three locations, two locations on the inner side of the upper portion and one location on the lower side. The shaft guard portion 12 of this example has a thick wall as a whole, and is a rigid body for holding the lip portion 11. Then, the lip portion 11 comes into close contact with the pivot shaft 1 and slides.

Further, a contact portion 15 is formed at the inner end position of the shaft guard portion 12 of the present example, and the contact portion 15 contacts the upper end surface of the pivot shaft holder 2, and the shaft guard portion 12, lip The part 11 is pushed up. Further, in this example, a connecting portion 14 to be described later is integrally formed at a lower outer position of the shaft guard portion 12.

In the mounting portion 13 to the vehicle outer plate 5 of this example, a fitting groove portion 13a that fits with an edge portion of the installation hole 5a of the pivot shaft 1 is formed at an outer peripheral position, and the inner side has a cylindrical shape. The hole 13b is formed. The outer diameter of the inner cylindrical hole 13b is formed to be larger than the lower outer position of the shaft guard portion 12, and the upper end position of the mounting portion 13 is formed integrally with the connecting portion 14.

The connecting portion 14 of this embodiment connects the mounting portion 13 and the shaft guard portion 12 with a play having flexibility. That is, the connecting portion 14 of this example is thin and flexible in its entirety, and connects the large-diameter mounting portion 13 and the small-diameter shaft guard portion 12 to each other. A stepped portion 14a is formed, and this stepped portion 14a forms a play. In this example, one step 14a is formed, but a plurality of steps 14a may be formed.

Next, the mounting of the waterproof member 10 having the above structure will be described. The mounting hole 5a of the vehicle outer plate 5 and the mounting portion 13 of the waterproof member 10 are engaged with each other. Next, the pivot shaft 1 is inserted into the shaft guard portion 12.

As a result, the pivot shaft 1 and the vehicle outer plate 5 can be waterproofed by the mounting portion 13 and the shaft guard portion 12.

The waterproof member 10 has versatility so that it can be commonly used depending on the length and the tilted state of the pivot shaft 1. That is, as shown in FIG. 3, when the vehicle body outer plate 5 is inclined or when the pivot shaft 1 is inclined due to the position of the wiper device, the pivot shaft 1 is placed inside the hollow shaft guard portion 12. By inserting and attaching, the lip part 11 and the shaft guard part 12 of the waterproof member 10 are tilted according to the tilt of the pivot shaft 1, but this tilt is flexible and has a play. Due to the connecting portion 14 which is provided, the mounting portion 13 can be dealt with without affecting.

Since the reaction force generated from the connecting portion 14 holds the connecting portion 14 at the lower position of the shaft guard portion 12, it does not reach the lip portion 11 and the lip portion 11 makes uniform contact. The pressure remains as it is, uneven wear of the lip portion 11 does not occur, and a reliable waterproofing effect can be obtained.

Further, for example, when the pivot shaft 1 extends to the outside for a long time with respect to the pivot shafts 1 having different lengths (heights) that extend to the outside, as shown in FIGS. The pivot shaft 1 is inserted into the shaft guard portion 12 of the material 10, and the upper end portion of the pivot shaft holder 2 comes into contact with the contact portion 15 formed at the lower end portion of the shaft guard portion 12 to push up the waterproof member 10. Since the play of the connecting portion 14 is extended, the waterproof member 10 expands and contracts at the connecting portion 14 even if the height of the pivot shaft 1 changes, and the optimum clearance X between the arm head 3 and the waterproof member 10 is always secured. can do.

On the other hand, for example, when the pivot shaft 1 is shortly extended to the outside, as shown in FIG. 3, the connecting portion 15 is mounted with play, so that the pivot shaft 1 is mounted. Waterproofing between the vehicle 1 and the vehicle outer plate 5 can be performed by the mounting portion 13 and the shaft guard portion 12.

FIG. 4 is a cross-sectional view of essential parts showing a second embodiment of the present invention. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. In this example, the lip portion 11 is formed inside the upper end of the shaft guard portion 12, and the fixing portion 21 is formed at the lower end portion of the shaft guard portion 12 so as to be fitted to the outer diameter of the pivot shaft holder 2. The fixing portion 21 is a rigid body, and a shoulder pad portion 22 is formed inside the fixing portion 21 at a position on the lip portion 11 side. The fixing portion 21 of this embodiment is for adjusting the lip portion 11 to the inclination of the pivot shaft 1, and the shoulder rest portion 22 of this embodiment is for pushing up the shaft guard portion 12 (that is, the lip portion 11).

In this example, the connecting portion 14 has a thin bellows shape and is connected at a substantially intermediate position of the shaft guard portion 12. The connecting portion 14 expands and contracts according to the inclination and height of the shaft guard portion 12 and is flexible to one side. Further, the depths of the pivot shaft 1 and the recess 3a are determined in advance so that the space Y can be set between the lower end surface of the arm head 3 and the upper end position of the connecting portion 14.

According to the present example, by inserting the pivot shaft 1 into the fixed portion 21 formed as a rigid body with respect to the tilt of the pivot shaft 1, the lip of the holding member 10 is adjusted in accordance with the tilt of the pivot shaft 1. The portion 11, the shaft guard portion 12, the fixed portion 21, and the shoulder rest portion 22 are inclined, and this inclination does not affect the mounting portion 13 due to the bellows-shaped connecting portion 14.

Further, the reaction force generated from the bellows-shaped connecting portion 14 does not reach the lip portion 11 because the pivot shaft 1 and the pivot shaft holder 2 are engaged and held by the fixing portion 21 of the holding member 10. Since the contact pressure remains uniform, uneven wear of the lip portion 11 does not occur, and waterproofing can be reliably performed. It is to be noted that the bellows-shaped connecting portion 14 expands and contracts to cope with different heights of the pivot shaft 1.

[0034]

[Effect of device]

 As described above, according to the present invention, the pivot shaft can be waterproofed by a single component, and the waterproofing of the vehicle outer plate and the pivot shaft can be achieved. In particular, the waterproof member can be made versatile so that it can be commonly used regardless of the length of the pivot shaft, and even if the pivot shaft is tilted, the connecting part with play does not affect the mounting part because the connecting part has play. It can follow the inclination of the shaft. And, even if the tilt of the pivot axis and the height are different at the same time, it is possible to sufficiently cope with it.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view of an essential part similar to FIG. 1, showing an example in which the pivot axis length is different.

FIG. 4 is a cross-sectional view of an essential part showing a second embodiment of the present invention.

[Explanation of reference numerals] 1 pivot shaft 2 pivot shaft holder 3 arm head 3a recess 3b through hole 4 mounting screw 5 vehicle outer plate 5a installation hole 6 wiper arm 10 waterproof member 11 lip portion 12 shaft guard portion 13 mounting portion 14 connecting portion 14a Step portion 15 Contact portion 21 Fixed portion 22 Shoulder rest portion X Clearance Y Space portion

Claims (2)

[Scope of utility model registration request] 1. A waterproof structure in which a pivot shaft extends from a mounting hole of the pivot shaft formed in a vehicle outer plate and waterproofs a pivot shaft connected to a wiper arm side by a waterproof member, wherein the waterproof member is a hollow cylindrical shape. Shaft guard part of
A mounting portion to the vehicle outer plate, a connecting portion that connects the mounting portion and the lower position of the shaft guard portion with flexibility, and a lip formed inside the upper portion of the shaft guard portion. And a mounting portion for mounting the waterproof member, and the pivot shaft is inserted into the shaft guard portion, and the pivot shaft waterproof structure is provided. 2. The waterproof structure for a pivot shaft according to claim 1, wherein the connecting portion is formed in a bellows shape.