RU70408U1 - ELECTRIC CAR SWITCH - Google Patents

Abstract

The switch relates to electrical engineering, mainly to the electrical circuits of vehicles. The task and the technical result are to increase reliability, protect indicators from overvoltage, improve manufacturability and reduce the cost of the circuit breaker. Improving lighting performance. Electric car push-button switch consists of a housing, a key mounted on a rod. On the stem is a cam mechanism for the limit position of the stem. The compression spring is designed to return the rod with the key to its original position. At the base there are pins for connecting to the vehicle's wiring network. The display unit is made in the form of a printed circuit board containing radio components, including an indicator, a resistor, a diode, designed for surface mounting. The display unit is installed in the stock. Guide rods are fixed in the stem and base, on which the spring is mounted. Switches can be made with other modifications of keys, functional symbols, as well as without any symbols, if they are not needed. Publish figure 1.

Description

The switch relates to electrical engineering, mainly to the electrical circuits of vehicles.

Known switches see 37.3710, 371.3710, previously produced by JSC "AVAR", Pskov. They have a significant mass, a significant switching force, reduced reliability of the backlight elements, implemented on autolamps.

Known switch 245.3710, manufactured by JSC "AVAR", Pskov, see certificate on PM No. 5667. Bull. No 12 on December 16, 1997

This switch consists of a housing in which are placed: a rod, a spring, a base with pins for connecting to the vehicle's wiring network, a backlight and a button, movable contacts.

Disadvantages of the switch: - there is no axial guide for the rod and spring, which causes distortion, deterioration of the switching conditions, increased noise during operation. Since the contacts are not removable and rearranged, the switch has very limited capabilities for implementing a variety of electrical switching circuits. Designed for specialized electrical circuits.

Known switch 75.3710 manufactured by JSC "AVAR", Pskov, see RF patent No. 2097865, application No. 95112940.

The switch comprises a housing with stops, a key, a rod with symbol backlight lamps and a control signaling device for the key, and a pusher that acts when switching to the contact system. On the base there is a cam mechanism for fixing the limit positions of the stem and a contact system with an instant switching mechanism. The base is rigidly connected to the casing with the help of locking latches. The longitudinally moving rod in the guides mounted on the base is spring-loaded with springs electrically connected to the terminals in the base and the lamp terminals mounted on the rod.

Its disadvantages are the design complexity and reduced reliability due to the presence of three transition contacts on each spring: plug-spring, spring-contact-part of the bulb; light bulb contact detail. Thus, on four springs there are 12 transitional connections, which can cause loss of contact. The body, stops and base are made as separate parts, which is not technologically advanced.

Known electric automobile push-button switch, see certificate for utility model of the Russian Federation No. 24314.

The switch contains a housing with stops, base, guide pins for return springs. The case with stops, the base, the guiding pins are a single integral part made by dielectric plastic molding. A rod with a LED symbol backlight and a LED indicator of a control signaling device is installed inside the housing. A key is fixed to the stock. A cam mechanism of limit positions is placed on the rod. The base contains pins for connecting to the vehicle wiring system.

Flexible contact parts are fixed on the rod, forming sliding contacts with pins.

The disadvantage of the considered technical solution is the reduced reliability of the backlight elements.

The patent for utility model No. 32923 MKI7 NOSH 13 \ 00 “Electric automobile push-button switch”, published on September 27, 2003, Bull. Number 27. This switch is taken as the closest analogue (prototype).

Electric automobile push-button switch consists of a housing I with stops 2, base 10, with guide pins II for return springs 8.

The housing I with the stops 2, the base 10, the guide pins II are a single integral part, made, for example, by casting from dielectric plastic. Inside the housing I, a rod 4 is installed with a lamp 6 or a LED indicator for illuminating the symbol 24, a lamp 14 or an LED indicator for a control signaling device 23.

Switches can be made with other modifications of keys, symbols of functional purpose. And also without any symbols and tell-tales, if they are not needed. On the stem 4, the key 3 is fixed.

On the rod 4 there is a cam mechanism 7 limit positions.

The base 10 contains pins 9 for connection to the vehicle wiring network.

The rod 4 contains a rack 12, in the groove 13 of which is placed a strap 17 with a compression spring 15. The strap 17 contains contact parts 18 located at its edges. Pins 19, 20 have bent pads 21, 22.

The switch operates as follows.

In the initial state, key 3 of the switch is not pressed. When you turn on the side lights, the backlight of symbol 24 is turned on from an external circuit. The LED 6 of the symbol backlight turns on. The level of this backlight can be adjusted from an external control element.

In this case, the power contact is open, the control signaling device is not turned on. The LED indicator light for the symbol and the control indicator have an operating voltage of 12 V.

When the key 3 is pressed, the stem 4 moves to the base 10.

In the pressed position, the rod is fixed by the cam mechanism of the limiting positions 7. Current flows through the contact parts 18, bent pads 21.22 of the pins 19, 20. The consumers connected to the pins 19, 20 are turned on. The control signaling device 23 is turned on from an external circuit connected to the pins 19, 20.

Pressing key 3 again switches the switch to its original position.

The disadvantages of the prototype:

- low reliability of LED indicators at 12 V, failing due to large electrical overvoltages arising in the vehicle electrical system;

- higher cost of LED indicators at 12 V and uneven backlight, giving a light beam with a corner rotation of only 40 °, compared with SMD diodes at 2.5 V, giving a light beam with a corner rotation of more than 120 °;

- lack of protection circuits, due to the sufficiently large dimensions of the 12 V LED indicators and the small size of the circuit breaker in the area where the LED indicators are located;

- not the manufacturability of the assembly and installation of LED indicators for 12 V, since they have cylindrical bodies, it is required to perform the operation of forming the terminals, they are installed on a stencil, after which the flexible contacts are pressed in, the terminals are cut off;

- increased consumption of silver-containing metal, since two contact parts mounted on a spring-loaded bar are made of silver-containing metal.

The objective and technical result consists in increasing reliability due to circuit protection of LED indicators against overvoltage, improving manufacturability and reducing material and labor costs

in the manufacture of the switch. Improving lighting performance and simplifying the design.

This is achieved by new technical solutions that are in a causal relationship with the technical result.

The essence of the claimed device is expressed in the aggregate of the following essential features.

The indicated problem in an electric automobile switch containing a housing with a base, a key fixed to the rod, a cam mechanism for the limit positions of the rod with a bracket, a return spring for the rod and pins for connecting to the vehicle’s wiring network is solved by the fact that it includes an indication unit installed in a rod electrically connected to at least two of the pins by means of flexible contact parts, the indication unit is made in the form of a printed circuit board containing radio components, such as an LED indicator OP, resistor, protective diode for surface mounting.

Electrically connected contact parts are fixed in the rod, which, when the rod moves, form sliding electrical contacts with the indicated pins, creating an electrical circuit.

This achieves such a technical result as improving reliability, increasing the uniformity of illumination of the symbol zone, and protecting the LED indicator against overvoltage.

In the stem and on the base there are guide rods on which a return spring is installed. This achieves an increase in manufacturability and a decrease in both material and labor costs, which is also a technical result.

The above set of features in comparison with the prior art allows us to conclude that the proposed technical solution meets the criterion of "novelty."

Figure 1 is a General view of the proposed switch in the context, schematically.

Figure 2 - electrical schematic diagram for 4 pins. Figure 3 is an electrical diagram, a circuit for 10 pins. Figure 4 - callout And figure 1, the contact part 20 conditionally broken, view of the contact part 16, schematically.

The electric car switch (hereinafter the switch) consists of a housing 1 with a base 15, a key 2, mounted on a rod 3.

On the stem is a cam mechanism 4 of the limit position of the stem with a bracket. Compression spring 5 is designed to return the rod with the key to its original position. At the base of 15 are two pins 6 and one each 7 and 8 for connecting pins to the vehicle’s wiring network can be up to 8 or more. Contact parts 19, 20 are permanently electrically connected. Pin 7 and contact piece 20 form a permanent electrical sliding contact. The display unit 9, installed in the stem 3, is made in the form of a printed circuit board 10 containing radio components, including an LED indicator 11 that gives a beam of light with a 120 ° angle of rotation, compared with 12V LEDs that give a light beam with a turn only of 40 °, what is the technical result achieved - improved lighting performance, a resistor 12, a protective diode 13, which are elements of electrical protection, performed for surface mounting, which is a technical result that ensures the reliability of the circuit breaker.

The display unit 9 is installed in the rod 3, is electrically connected by soldering to the contact parts 14, 16, which, in turn, form permanent sliding electrical contacts with the pins 6, thereby achieving a technical result, which consists in reducing the number of contacting joints by contact method, which provides increased reliability of the circuit breaker.

In the rod 3 and the base 15 there are guide rods 17 and 21 on which a compression spring 5 is mounted.

The switch operates as follows.

In the initial position, key 2 is not pressed. When turning on the external fire control lights via a chain of pins 6, contact part 14, 16, an electric current flows, the illumination of symbol 18 is turned on by LED 11. The level of this backlight can be adjusted from an external control device (not shown in the drawing).

The electrical power circuit is open, the contact part 20 and the pin 7 are in a constant electrical sliding contact. When you press 2, the rod 3 together with the guide rod 17, compressing the spring 5, move down. In the pressed position, the rod 3 is fixed by a cam mechanism 4 with a bracket of limit positions. In this case, the contact parts 19, 20 form an electric circuit by means of sliding contacts with pins 7.8, which allows electric current to flow through it, and thereby, a supply voltage is supplied to the electricity consumer connected to pins 7 and 8.

Pressing key 2 again switches the switch to its original position. The power contacts between the 7.8 pins open, the voltage is removed from the consumer, and it turns off. Illumination of symbol 18 with LED 11 remains on until the side lights of the external controls are turned off.

Depending on the switching circuit, voltage can be applied to the consumer not only when the key is pressed, but also when the key moves to its original position.

The use of the claimed technical solutions provides high reliability and adaptability of the circuit breaker for use in promising passenger cars.

Improved lighting performance, reduced cost.

Switches can be made with other modifications of electrical circuits, keys, functional symbols, as well as without any symbols if they are not needed.

Claims (3)

1. An electric car switch containing a housing with a base, a key mounted on the rod, a cam mechanism for the limit position of the rod with a bracket, a return spring for the rod and pins for connecting to the vehicle’s wiring network, characterized in that it includes an indication unit mounted in the rod electrically connected to at least two of these pins by means of contact parts, and the display unit is made in the form of a printed circuit board containing radio components performed for surface mounting , Wherein the switch comprises guide rods, on which is installed the return spring for the rod. 2. The switch according to claim 1, characterized in that electrically connected contact parts are fixed in said rod, which, when the rod moves, form sliding electrical contacts with the indicated pins, creating an electric circuit. 3. The switch according to claim 1, characterized in that the display unit contains radio components, at least an LED indicator, a resistor, a diode.