RU162704U1 - FLEXIBLE TUBE FOR THE AUTOMOBILE INDUSTRY - Google Patents

Abstract

1. Flexible corrugated tube for the automotive industry from compositions based on polypropylene, manufactured by extrusion, having a trapezoidal shape of the corrugation, an inner diameter of 15 mm to 20 mm, characterized in that the profile has an angle of inclination from 12 ° to 13 °, the width of the corrugation from 1.7 mm to 1.9 mm, corrugation pitch from 3.67 mm to 3.87 mm, corrugation height from 1.65 mm to 1.85 mm. 2. The tube according to claim 1, characterized in that the tube is marked by coextrusion with a color different from the color of the base material. 3. The tube according to claim 1, characterized in that the tube has a cut made along its entire length to ensure ease of assembly in the manufacture of bundles.

Description

The utility model relates to electrical engineering and can be used in the manufacture of automotive harnesses with the aim of protecting them during the operation of electrical equipment and devices.

It is known that flexible corrugated tubes for the automotive industry, obtained by extrusion from thermoplastic materials such as polypropylene, are widely used as a protective and insulating material for the manufacture of wire harnesses, which, in turn, are used to connect various electrical devices and automobile systems . Wires or harnesses are not used without external protection. Flexible corrugated tube protects wiring from dust, dirt, external chemical and physical-mechanical influences.

In such conditions, important indicators are a high degree of environmental protection, chemical resistance (resistance to liquids), physical and mechanical strength (elongation at break, permanent deformation, thermal resistance, bending strength in frost, memory preservation ( the possibility of restoring a split tube), burning rate, etc.).

Also no less important indicator is the consumption of material in production.

Various corrugation profiles are known: equal-height, different-height, with equal and different intervals, rectangular, trapezoidal, screw, etc.

Closest to the proposed device is a flexible corrugated polypropylene tube for the automotive industry, manufactured by CJSC DKS in accordance with TU 2247-002-47022248-2008 (www.dkc.ru).

Tubes are made from a composition based on polypropylene by extrusion. The profile design of this tube assumes the parameters presented in table 1. A sketch of a flexible corrugated polypropylene tube for the automotive industry is shown in Figure 1.

The disadvantages of these tubes are the increased consumption of material in the production of tubes, the thickness of the tube wall along its entire length, the deterioration of the removal of the tube from the forming elements, the influx of material formed in the cavity between the ribs of the corrugation resulting from increased wear (chips) of the forming elements during production .

The purpose of the utility model is to obtain a flexible corrugated tube for the automotive industry from compositions based on polypropylene, manufactured by extrusion, with improved technical characteristics in relation to the prototype by changing the profile of the tube.

In FIG. 1 shows the profile of the tube, the parameters are presented in table 2.

The corrugation has an equal height trapezoidal shape. In this utility model, at close values of the inner diameter of the tube d, in comparison with the prototype, the angle of inclination of the profile α °, the step of the corrugation C are increased and the width of the corrugation A, the height of the corrugation B.

The above parameters together allow you to achieve the following technical result:

1) uniformity of the tube wall thickness along the entire length;

2) reduction of material consumption during production;

3) the best removal of the tube from the forming tooling;

4) extension of the service life of the forming tooling;

5) minimizes the likelihood of material sagging between the ribs of the corrugation during production;

6) the physical and mechanical properties of the tube are preserved.

To isolate various types of bundles, it is possible to produce this tube with a marking made by the coextrusion method, in a color different from the color of the base material.

To ensure ease of assembly in the manufacture of bundles, it is possible to execute this tube with a cut made along its entire length, while all the declared properties of the tube are preserved.

A combination is also possible: a tube with a slit along its entire length and marking made by coextrusion with a color different from the color of the base material.

The combination of the above parameters and the technical result solve the goal.

Claims (3)

1. Flexible corrugated tube for the automotive industry from compositions based on polypropylene, manufactured by extrusion, having a trapezoidal shape of the corrugation, an inner diameter of 15 mm to 20 mm, characterized in that the profile has an angle of inclination from 12 ° to 13 °, the width of the corrugation from 1.7 mm to 1.9 mm, corrugation pitch from 3.67 mm to 3.87 mm, corrugation height from 1.65 mm to 1.85 mm. 2. The tube according to claim 1, characterized in that the tube is marked by coextrusion with a color different from the color of the base material. 3. The tube according to claim 1, characterized in that the tube has a cut made along its entire length to ensure ease of assembly in the manufacture of bundles.

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