JPS60234046A - Door mirror mounting body - Google Patents

Abstract

PURPOSE:To reduce slide resistance without application of surface treatment, by a method wherein a glass run part, disposed to the open end of a glass containing groove, is formed by a nitrile rubber and polyvinyl chloride polyblend having a specified composition. CONSTITUTION:A miror mounting part 1 of a door mirror mounting body 2 has configuration which occupies a nipping angle part between an upper edge 11a of a door body during closing of a door and a front pillar 12, and a glass containing groove 3, the bottom of which is the side where it makes contact with the front pillar. A glass run part 5, consisting of a pair of strip lips 4, approaching each other at the forward end side, are located at the edge, positioned opposite to the nipping angle part, of the glass containing groove 3. In which case, the glass run part 5 is formed by a nitrile rubber and polyvinyl chloride polyblend in which a content of polyvinyl chloride is set to 20-60wt%. This enables reduction in slide resistance of the glass run part 5 without application of surface treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to the mounting of a door mirror attached to a satsureless door of an automobile.

(Conventional technology) Due to the relaxation of laws and regulations regarding mirrors, fender
In place of mirror cars, demand for door mirror cars is increasing, mainly from the standpoint of design. In order to attach a door mirror to a sash-less door, for example, as shown in FIG. 3, the mirror is attached through the body 2, which is fixed to the door body 11 by protruding the portion 1. The structure of the body 2 for mounting this door mirror is generally as shown in FIGS. 1 and 2. That is, the mirror mounting part l is
It has an outer shape that occupies the narrow corner between the upper edge 11a of the door body and the front pillar 12 when the door is closed, and has a glass storage groove 3 whose bottom is on the side that touches the front pillar. A pair of strip lips 4 close to each other on the tip side of the opening edge located opposite to the narrow angle part
．． It has a glass run part 5 consisting of 4 parts. Note that 6 is a leg portion that is attached to the door body 11. here.

The mirror mounting part 1 is formed by a U-shaped insert 7 made of sheet metal and a covering part 8 made of an elastic polymer material.
The glass run portion 5 is formed by extending the covering portion 8.

Note that 9 is a hole for attaching the mirror, and 10 is a hole for a lead wire.

The polymeric elastomer material mentioned above is usually ethylene propylene rubber (EP), which has been conventionally used in glass run, etc.
R) is used. The glass run portion 5 formed of this EPR has a heavy glass lifting load and poor sealing performance. The reason for this is that, as shown in FIG. 3, when the glass is lifted up and down, the lifting glass 13
Since it slides between the tips of the row lips 4, 4 of the grass run part while entering or leaving the glass run section, the sliding resistance increases, and the tips of the row lips 4 are reversed as shown in Fig. 4. This is presumed to be due to the fact that the reversal may become fixed.

Therefore, in order to reduce the sliding resistance with the glass in the glass run section, that is, the frictional force, the sliding part of each lip, that is, the inside of the tip, is usually treated with silicone oil or urethane paint. However, in the case of urethane, pre-painting treatment (primer treatment, etc.) is required during manufacturing, which increases the number of manufacturing steps, and in the case of silicone oil, the oil adheres and contaminates the glass, and both types of As the film falls off, the rubber surface is exposed, and the sliding resistance increases again, and the glass becomes black and contaminated due to the adhesion of fine rubber particles generated by wear.

(Object of the Invention) In view of the above, an object of the present invention is to provide a door mirror mounting system that does not require surface treatment to reduce sliding resistance in the glass run portion.

(Summary of the Invention) In the door mirror mounting body of the present invention, at least the glass run portion thereof has a polyvinyl chloride content of 20 to 60 wt.
% of nitrile rubber/polyvinyl chloride polyblend.

(Embodiment) Here, the installation of a door mirror will be explained by taking as an example the one shown in FIGS. 1 and 2, which was explained in the section of the prior art.

In this door mirror installation, the glass run part 5 is
Polyvinyl chloride (PVC) content 20-60wt%
Nitrile rubber/polyvinyl chloride polyblend (r
NBR/PVC polyblend). Here, if the PVC content is less than 20wt$,
Mixing effect of PVC □ Reducing sliding resistance and weather resistance,
Improvements in ozone resistance, oil resistance, chemical resistance, and abrasion resistance □ are possible, but on the other hand, if the content exceeds 60 wt%, the compression set increases, causing problems in the sealability of the glass run portion over time. When used, inorganic fillers (carbon black, zinc white, etc.), vulcanizing agents, vulcanization accelerators, plasticizers, etc., which are usually blended into NBR, are blended.

In this formulation, it is desirable to use one or more of the specific lubricants shown in Table 1 in a combination of 1 to 10 PHR, since this can further reduce the sliding resistance of the glass run portion. If the amount of lubricant added is less than 1 PHR, the lubricant greening effect (sliding resistance reduction effect) will be poor, but if it exceeds 10 PHR, the added effect will hardly increase and there is a risk of plume generation and glass contamination.

As described above, the door mirror mounting body of the present invention is fixed to the door body 11 by protruding the portion 1, and the door mirror is attached to the portion 1 with screws or the like.

In addition, in the example shown, the glass run part and the mirror mounting part are integrally molded with the covering part, but only the glass run part is made of NBR/PVC.
They may be molded simultaneously using a polyblend, or may be molded separately and then integrated with an adhesive or the like.

(Effects of the Invention) As described above, at least the glass run portion of the door mirror mounting body of the present invention is made of NBR/PVC polyblend, and as shown in Examples and Comparative Examples below,
The sliding resistance of the glass run portion is much lower than when it is formed using EPR, and it can be mounted on an actual model without any surface treatment to reduce the sliding resistance. Therefore, as a matter of course, problems such as glass staining, increase in sliding resistance over time, and deterioration of sealing performance, which have conventionally occurred with surface treatments using silicone oil or urethane paint, are not caused.

The reason why glass stains do not occur is that the rubber fine powder generated when the NBR/PVC polyblend itself is worn does not have adhesiveness to glass.

(Example/Comparative Example) Each test piece of the Example/Comparative Example was prepared by using a formulation in which the polymer and lubricant were as shown in Table 2 in the following basic formulation, and was tested at 100 kgf/crn'X 100°C x 10m1.
It was obtained from a 2 lt rubber sheet that was vulcanized and molded under the conditions of n.

Basic composition (unit double placement part); Poly-io.

Carbon black 60 Plasticizer 30 Zinc white.

Sulfur 0.5 Vulcanization accelerator 4 Lubricant variable In addition, the test method for each characteristic was as follows.

(1) Sliding resistance: As shown in Fig. 5, a glass plate 22 (50 pieces x 100 pieces x 5 glue pieces) and a weight 23 (500 g or 100 g) are placed on 2 sat sheets (test pieces) 21. The average load (dynamic friction) of the glass plate in a sliding state was measured by pulling with the mounting thread 24.

(2) Ozone resistance: Evaluate crack generation time by dynamic ozone test (conditions: 0-20% elongation repetition 60 cpIl)
l, ozone concentration 50 pphm, ambient temperature 38°C) (
3) Abrasion resistance; Akron abrasion test (BS903, Art A9) (conditions: load 61b, angle 15°, rotation speed (drum side 33 rpm, sample side 16 rpm)) (4) Compression permanent set; JISKf1301- 10 (condition, 10
0'OX 22hr, , 25% compression) From the results shown in Table 2, it can be seen that the body of the door mirror whose glass run part is molded from the NBR/PVC polyblend of this invention is EPD.
Compared to the glalan part molded with M, the sliding resistance is of course much lower, and the abrasion resistance is also good, and the compression set and ozone resistance are sufficient for practical use. I understand that.

Table 1

[Brief explanation of the drawing]

Fig. 1 is an end view taken along the line I-I in Fig. 2, Fig. 2 is a front view showing an example of the body mounting the door mirror to which this invention is applied, and Fig. 3 shows the mounting of the door mirror when mounted on an actual vehicle. Figure 4 is an end view showing the positional relationship between the body and the elevating glass when installing the door mirror at the rV-IV line in Figure 3, and Figure 5 is a model showing the method for measuring sliding resistance. It is a diagram. 1...Mirror mounting part, 2...Door mirror mounting body, 3...Glass storage groove, 5...Glass run part, 11
...Door body, lla...Door body upper edge, 12...Front pillar, 13...Elevating glass. Patent applicant Figure 8

Claims (1)

[Scope of Claims] A door mirror attached to a satsuru door of an automobile is a body, and the mirror attachment part has an external shape that occupies the narrow corner between the upper edge of the door body and the front pillar when the door is closed. and a glass storage groove whose bottom is on the side that touches the front pillar, and a glass run part on the opening edge of the glass storage groove located opposite to the narrow angle part. The door mirror mounting body is characterized in that at least the glass run portion is formed of a nitrile rubber/polyvinyl chloride polyblend having a polyvinyl chloride content of 20 to 60 vt%.