JP3622333B2 - Grommet filling sealing agent, wire harness sealing method and sealing structure using the sealing agent - Google Patents

Description

【００１９】
上記シール剤１０は主剤と硬化剤とを、グロメット１に注入する直前に混合して、該混合タンク１５から管１６を通し、ノズル１７からグロメット１へと注入している。
【００２０】
グロメット１に注入されたシール剤１０は、グロメット１の拡径部１ｂ側から小径筒部１ａへと浸透していく。その過程で、電線ｗの隙間および電線ｗとグロメット内周面の隙間にシール剤１０は浸透し、この浸透性は粘度を３００ｃｐｓ程度に低く設定しているため、シール剤１０の流動性は良く、上記隙間が狭い場合でもスムーズに浸透する。よって、隙間に漏れなくシール剤１０を充填できる。上記のように、隙間に浸透しながらシール剤１０が流下して、グロメット取付領域から下方に達すると、電線群はテープ１２で強く縛られ、隙間が最小とされていると共に、この下方領域に達するまでに時間がかかり、シール剤がゾル状態からゲル状態へと進み、流動性が低下しているため、グロメット１より下方へシール剤１０はほとんど流れ出ない。
【００２１】
グロメット１の内部に注入され、電線ｗの隙間および電線ｗとグロメット内周面の隙間に充填されたシール剤１０は約５分程度でゲル化して流動性がなくなり、かつ、約１０分程度で完全に硬化する。即ち、従来１５分以上かかっていた作業時間を大幅に短縮できる。
【００２２】
図２および図３は第２実施例を示し、第２実施例では、グロメット１’として、小径筒部１ａ’と拡径部１ｂ’との間に中径筒部１ｃ’を設けており、ワイヤハーネスＷ／Ｈの電線ｗを強制的に広げて隙間を形成するための電線拡径用のスペーサ１５を、上記中径筒部１ｃ’の内周面に密嵌させて取り付けるようにしている。
【００２３】
上記スペーサ１５は略円板形状で、その外周全体に一定角度をあけて放射状の電線挿入凹部１５ａ、１５ａ・・・を備えている。該スペーサ１５はその各電線挿入凹部１５ａに電線ｗを分配し、スペーサ１５により電線群を強制的に拡径させて、電線ｗの間に隙間を設けている。該スペーサ１５を取り付けたワイヤハーネスＷ／Ｈはその両側でテープ１２を巻き付け、スペーサ１５の取付部位より電線間の隙間を漸次狭くしている。
【００２４】
上記スペーサ１５を取り付けた状態で、グロメット１にワイヤハーネスＷ／Ｈを挿通し、スペーサ１５を中径筒部１ｃの内周面に密着させている。
【００２５】
上記スペーサ１５を用いると、ワイヤハーネスＷ／Ｈの電線量にかかわりなく、電線ｗを片寄った状態とせずに、中心より周方向に均等に拡散でき、シール剤１０を電線ｗの間の大きな隙間に確実に充填でき、よりシール性能を高めることができる。
【００２６】
なお、電線拡径用のスペーサ１５として、図４に示す櫛歯状のものを用い、各櫛の間に電線ｗを通して電線間に強制的に隙間を形成してもよい。
【００２７】
【発明の効果】
以上の説明より明らかなように、本発明によれば、グロメットの内部に注入して、ワイヤハーネスの電線間の隙間および電線とグロメット内周面の隙間に充填させるシール剤を、従来より粘度を低くして流動性を高めているため、上記隙間へ浸透性が向上する。よって、全ての隙間を漏れなくシール剤でシールすることができ、グロメット取付部分におけるワイヤハーネスの防水性能を高めることができる。
【００２８】
また、従来のシール剤より硬化時間を短縮しているため、シール剤の流動性を高めても、シール剤がグロメット取付領域から流れでてしまう問題を解消できると共に、ワイヤハーネスに対するグロメット取付工程の作業時間を短縮でき、生産性を向上させることができる。
【図面の簡単な説明】
【図１】本発明の第１実施例を示す断面図である。
【図２】第２実施例を示す断面図である。
【図３】（Ａ）は第２実施例で用いるスペーサを示し、（Ｂ）は該スペーサに電線ｗを通した状態を示す正面図である。
【図４】他のスペーサに電線を通した状態を示す正面図である。
【図５】従来例を示す断面図である。
【図６】他の従来例を示す断面図である。
【符号の説明】
１、１’ グロメット
１ａ 小径筒部
１ｂ 拡径部
１０ シール剤
１２ テープ
１５ スペーサ
Ｗ／Ｈ ワイヤハーネス
ｗ 電線[0001]
[Industrial application fields]
The present invention relates to a sealing agent for grommet filling, a method of sealing a wire harness using the sealing agent, and a sealing structure, wherein the wire harness is inserted into the grommet and the grommet is filled with the sealing agent to achieve waterproofing. In particular, the penetration of the sealing agent into the gap between the wire groups of the wire harness is improved to improve the waterproof performance, and the curing time of the sealing agent is promoted to improve the work efficiency.
[0002]
[Prior art]
Conventionally, when a wire harness is routed through a through-hole formed in a vehicle body panel of an automobile, the wire harness W / H is inserted into a rubber grommet 1 as shown in FIG. The wire harness W / H is brought into close contact with 1a, and the engaging groove 1c provided on the outer periphery of the enlarged diameter portion 1b is engaged with the peripheral wall of the through hole 2 of the vehicle body panel P, so that the lip portion 1d provided on the vehicle body attaching portion 1b. Is adhered to the vehicle body panel P and sealed.
[0003]
When the wire harness to which the grommet is attached is routed from the outdoor side on the engine room side to the indoor side, it is necessary to provide a waterproof seal. Therefore, as shown in FIG. Without winding tape around the outer circumferential surface of the harness W / H, the wires w constituting the wire harness are put apart one by one, the sealing agent 3 is injected from the enlarged diameter portion 1b side, and the gap between the wires w The gap between the electric wire and the grommet inner peripheral surface is filled with the sealing agent 3 so that the gap is eliminated and a reliable seal is achieved.
[0004]
[Problems to be solved by the invention]
However, when the sealing agent is filled, the gap between the wires of the wire harness is small, and the conventionally used sealing agent has a relatively high viscosity of about 1000 cps to 2000 cps. There was a problem that did not penetrate easily.
[0005]
When the viscosity of the sealant is lowered and the fluidity is increased, the permeability is improved. In that case, however, the conventional sealant takes more than 15 minutes to cure, and in the meantime, the sealant is removed from the grommet mounting region. It has flowed downward, and a problem has occurred that the gap between the wires inside the grommet is not sufficiently filled with the sealant.
[0006]
The present invention has been made in view of the above problems, and while lowering the viscosity of the sealing agent to increase the permeability, the curing time of the sealing agent is promoted more than before, and the sealing agent flows down from the grommet mounting region. The purpose is to reduce the work time.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a viscosity reducing agent and a curing accelerator as a sealing agent filling the gap between the wires of the wire harness inserted through the grommet and the gap between the wire and the inner peripheral surface of the grommet. A sealant for filling grommets characterized in that it is a two-component reaction curable composition comprising a main agent formulated with a predetermined ratio and a curing agent, having a viscosity of 200 cps to 500 cps and a gel time of 3 to 7 minutes. doing.
[0008]
The sealing agent has a weight ratio of the main agent and the curing agent in the range of 5.5: 1 to 1: 1, and uses polyether polyol as the main agent, and triethanol as a curing accelerator to be blended in the main agent. A low molecular weight aromatic hydrocarbon is used as an amine, dibutyltin dilaurate, a viscosity reducing agent, an antioxidant is included, and a polyisocyanate is used as the curing agent. (Claim 2) When the sealing agent described above is used, the viscosity of the sealing agent is reduced to about 1/3 to 1/6 of the conventional 1000 to 2000 cps with the viscosity being 200 to 500 cps, preferably 300 cps. , Fluidity can be enhanced. Therefore, the sealing agent can be sufficiently permeated into the gap between the electric wire groups of the wire harness inside the grommet and the gap between the electric wire and the inner peripheral surface of the grommet. In addition, since the gelling time of the sealing agent is set to 3 to 7 minutes, preferably about 5 minutes, it can be gelled before the sealing agent flows downward from the grommet mounting region, and the sealing agent flows out from a necessary region inside the grommet. There will be no malfunction. In addition, when the wire harness below the grommet attachment region is strongly tied with a tape to reduce the gap between the electric wires, the gelling sealing agent can be reliably prevented from flowing out through the small gap.
[0009]
Further, the present invention is the invention of claim 3, wherein a number of electric wires constituting the wire harness are passed through a spacer for expanding the electric wire to provide a gap for filling a sealant between the electric wires,
The wire harness is inserted into a rubber grommet having a small-diameter cylindrical portion that is in close contact with the outer periphery of the wire harness and an enlarged-diameter portion having the vehicle body attachment portion, and the spacer attached to the wire harness is attached to the grommet inner circumferential surface. In addition to tightly fitting, tape is wound from the tip of the small diameter cylindrical part to the outer peripheral surface of the wire harness to position and fix the grommet to the wire harness,
The grommet is positioned vertically with the enlarged diameter portion as an upper portion, and the sealing agent according to claim 1 or 2 is injected from an upper end opening of the enlarged diameter portion, and the gap between the wires and the gap between the wires and the inner surface of the grommet are injected. The present invention provides a method for sealing a wire harness using a sealing agent characterized by being filled with the sealing agent.
[0010]
When the sealant according to claim 1 or 2 is used, since the viscosity is low and the fluidity is good, even if the wire group constituting the wire harness is forcibly widened and no gap is provided, the wire group is slightly Although the sealing agent can be permeated into the gaps, the sealing agent is more surely provided between the electric wire groups if the gaps are provided by forcibly expanding the wire groups of the wire harness through the spacers. It can be filled with to improve waterproof performance.
[0011]
Furthermore, the present invention is the seal structure in which the gap between the wires of the wire harness inserted through the grommet and the gap between the wires and the grommet inner peripheral surface is filled with a sealant in the present invention. A two-component reaction-curing sealant composed of a main agent and a curing accelerator in a predetermined ratio and a curing agent is used, and the viscosity of the sealing agent is set to 200 cps to 500 cps and the gelation time is set to 3 to 7 minutes. A wire harness sealing structure is provided.
[0012]
【Example】
The present invention will be described below with reference to the drawings.
[0013]
FIG. 1 shows a seal structure of a wire harness in a grommet mounting portion according to a first embodiment of the present invention. The shape of the grommet 1 is the same as that of the conventional example shown in FIG. That is, the grommet 1 is made of rubber, and a large number of wires w constituting the wire harness W / H are passed through the small diameter cylindrical portion 1a that is in close contact with the outer peripheral surface of the wire group of the wire harness W / H, thereby leading the tip of the small diameter cylindrical portion 1a. And the wire harness W / H tape 12 are tightly wound to make the gap generated between the wires w as small as possible.
[0014]
In this state, the small-diameter cylindrical portion 1a is on the lower side, the enlarged-diameter portion 1b having the vehicle body attachment portion is on the upper side, and the sealing agent 10 is injected from the opening end of the enlarged-diameter 1b. At that time, since the lower end of the grommet 1 is strongly tightened with the tape 12, the sealing agent is prevented from flowing down below the grommet 1.
[0015]
The sealant 10 uses a two-component reaction curable sealant composed of a main agent in which a viscosity reducing agent and a curing accelerator are blended at a predetermined ratio, and a curing agent, and the viscosity of the sealing agent is 200 cps to 500 cps, preferably Is 300 cps, the gelation time is 3-7 minutes, preferably 5 minutes, and the complete curing time is 10 minutes.
[0016]
In the sealing agent, the weight ratio of the main agent and the curing agent is set in the range of 5.5: 1 to 1: 1, preferably 4: 1, of the main agent: the curing agent. In addition, a polyether polyol is used as a main agent, triethanolamine and dibutyltin dilaurate are used as a curing accelerator blended in the main agent, a low molecular weight aromatic hydrocarbon is used as a viscosity reducing agent, and an antioxidant is included. . On the other hand, polyisocyanate is used as a curing agent.
[0017]
The mixing ratio of the main agent in the sealing agent is as shown in the following table.
[0018]
[Table 1]

[0019]
In the sealing agent 10, the main agent and the curing agent are mixed immediately before being injected into the grommet 1, passed through the pipe 16 from the mixing tank 15, and injected into the grommet 1 from the nozzle 17.
[0020]
The sealing agent 10 injected into the grommet 1 penetrates from the enlarged diameter portion 1b side of the grommet 1 to the small diameter cylindrical portion 1a. In the process, the sealant 10 penetrates into the gap between the electric wire w and the gap between the electric wire w and the inner peripheral surface of the grommet, and this permeability is set to a viscosity as low as about 300 cps. It penetrates smoothly even when the gap is narrow. Therefore, the sealing agent 10 can be filled without leaking into the gap. As described above, when the sealant 10 flows down while penetrating into the gap and reaches the lower side from the grommet mounting area, the wire group is strongly bound by the tape 12, and the gap is minimized, and the lower area is It takes time to reach the sealant, and the sealant advances from the sol state to the gel state and the fluidity is lowered. Therefore, the sealant 10 hardly flows downward from the grommet 1.
[0021]
The sealing agent 10 injected into the grommet 1 and filled in the gap between the electric wire w and the gap between the electric wire w and the inner peripheral surface of the grommet gelates in about 5 minutes and loses its fluidity, and in about 10 minutes. Completely cure. That is, the work time which has conventionally taken 15 minutes or more can be greatly reduced.
[0022]
2 and 3 show a second embodiment. In the second embodiment, as the grommet 1 ', a medium-diameter cylindrical portion 1c' is provided between the small-diameter cylindrical portion 1a 'and the enlarged-diameter portion 1b'. A spacer 15 for expanding the electric wire for forcibly expanding the electric wire w of the wire harness W / H to form a gap is attached to the inner peripheral surface of the medium-diameter cylindrical portion 1c ′ by tightly fitting it. .
[0023]
The spacer 15 has a substantially disk shape and is provided with radial wire insertion recesses 15a, 15a,. The spacer 15 distributes the electric wire w to each of the electric wire insertion recesses 15a, forcibly expands the diameter of the electric wire group by the spacer 15, and provides a gap between the electric wires w. The wire harness W / H to which the spacer 15 is attached is wound with the tape 12 on both sides thereof, and the gap between the electric wires is gradually narrowed from the attachment portion of the spacer 15.
[0024]
With the spacer 15 attached, the wire harness W / H is inserted into the grommet 1, and the spacer 15 is brought into close contact with the inner peripheral surface of the medium-diameter cylindrical portion 1c.
[0025]
When the spacer 15 is used, regardless of the wire amount of the wire harness W / H, the wire w can be evenly diffused in the circumferential direction from the center without causing the wire w to be offset. Can be reliably filled, and the sealing performance can be further improved.
[0026]
In addition, as the spacer 15 for expanding the electric wire, a comb-like one shown in FIG. 4 may be used, and a gap may be forcibly formed between the electric wires through the electric wires w between the combs.
[0027]
【The invention's effect】
As is clear from the above description, according to the present invention, the viscosity of the sealing agent that is injected into the grommet to fill the gap between the wires of the wire harness and the gap between the wire and the grommet inner peripheral surface is higher than that of the conventional. Since the fluidity is increased by lowering, the permeability to the gap is improved. Therefore, all the gaps can be sealed with the sealant without leakage, and the waterproof performance of the wire harness at the grommet mounting portion can be enhanced.
[0028]
In addition, since the curing time is shortened compared to the conventional sealant, even if the fluidity of the sealant is increased, the problem of the sealant flowing out of the grommet attachment region can be solved, and the grommet attachment process for the wire harness can be eliminated. Work time can be shortened and productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a second embodiment.
3A is a front view showing a spacer used in the second embodiment, and FIG. 3B is a front view showing a state where an electric wire w is passed through the spacer.
FIG. 4 is a front view showing a state in which an electric wire is passed through another spacer.
FIG. 5 is a cross-sectional view showing a conventional example.
FIG. 6 is a cross-sectional view showing another conventional example.
[Explanation of symbols]
1, 1 'Grommet 1a Small diameter cylindrical portion 1b Large diameter portion 10 Sealing agent 12 Tape 15 Spacer W / H Wire harness w Electric wire

Claims (4)

A sealing agent that fills the gap between the wires of the wire harness inserted into the grommet and the gap between the electric wire and the inner peripheral surface of the grommet, and as the sealing agent, a main agent containing a viscosity reducing agent and a curing accelerator in a predetermined ratio; A sealing agent for filling grommet, which is a two-component reaction curable composition comprising a curing agent, has a viscosity of 200 cps to 500 cps, and a gelation time of 3 to 7 minutes. The sealing agent has a weight ratio of the main agent and the curing agent in a range of 5.5: 1 to 1: 1 of the main agent: curing agent, and a polyether polyol is used as the main agent, and is blended in the main agent. triethanolamine and dibutyltin dilaurate urate, a low molecular weight aromatic hydrocarbon as a viscosity reducing agent used as the curing accelerator, further, one comprising an antioxidant, according to claim 1 which is used polyisocyanate as the curing agent The sealing agent for grommet filling described in 1. A small-diameter cylindrical portion for passing a large number of wires constituting the wire harness through a spacer for expanding the diameter of the wire to provide a gap for filling a sealant between the wires, and then closely contacting the outer periphery of the wire harness, and mounting the vehicle body The wire harness is inserted into the inside of a rubber grommet having an enlarged diameter part, and the spacer attached to the wire harness is tightly fitted to the inner peripheral surface of the grommet, and the outer periphery of the wire harness from the tip of the small diameter cylindrical part A tape is wound around the surface to position and fix the grommet to the wire harness, and then the grommet is positioned vertically with the enlarged diameter portion as an upper portion, and the sealing agent according to claim 1 or 2 from an upper end opening of the enlarged diameter portion. A wire using a sealing agent, wherein the sealing agent is filled in the gap between the wires and the gap between the wires and the inner surface of the grommet Method of sealing a harness. A seal structure in which the gap between the wires of the wire harness inserted into the grommet and the gap between the wire and the inner peripheral surface of the grommet is filled with a sealant. As the sealant, a viscosity reducing agent and a curing accelerator are blended at a predetermined ratio. A wire harness characterized in that a two-component reaction curable sealant comprising a main agent and a curing agent is used, the viscosity of the sealant is set to 200 cps to 500 cps, and the gelation time is set to 3 to 7 minutes. Seal structure.

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