SU1359813A1 - Ignition switch - Google Patents

Abstract

The invention relates to electrical engineering and can be used in rotary-type switching equipment. The goal is to increase reliability. Spring-loaded bridge contacts 18 are radially located on the drive element 11 and interact with the flat fixed contacts 5. The drive element 11 has the ability to move along the rotary axis 9 along the spline grooves 14 of the housing 1, which eliminates the distortion of the drive element 11 from the forces occurring at switching circuits, and provides a constant contact pressure in each circuit, 3 Il. (g / 4 / J guv 26 .ff -f -17 -16 01 OO MiidL ICO

Description

 13

The invention relates to electrical engineering, in particular to the design of an ignition switch, and may be. used in the switching equipment of autotractor electrical equipment.

The aim of the invention is to improve the reliability of switching circuits by reducing contact wear.

FIG. 1 shows the ignition switch in perspective; in fig. 2 - the same. top view, in FIG. 3 - electrical circuit switching circuit.

The switch contains (fig. 1,2) case 1, on which plug 2 are placed with fixed contacts 3-4, 5-6, 7-8 according to the number of switched circuits (fig. 3), executed as

pair of plates of different lengths (associated with contacts 5–6, 7–8 — a smaller switching circuit), a rotary axis 9, provided with protrusions 10, which engage with the driving element 11 along respective screw grooves 12, while driving the element 11 is connected with the housing 1 by means of protrusions 13 located on the drive element 11 entering the slotted grooves 14 of the housing 1. In addition, in the recesses 15 of the drive element 11 the bridge contacts 17-19 are spring-loaded with flat springs 16 by the number of switched chains (Fig. 3) pairs of contact parts 20-21, 22-23, 24-25, the location of which is determined by the location of the fixed contacts 3-4, 5-6, 7-8 in the housing 1, opposite the bridge contacts 17-19 above the fixed contacts 3- 4, 5-6, 7-8 in the housing 1 are made protrusions 26-28, opening the corresponding electrical circuits.

The ignition switch works as follows.

When rotating the rotary axis 9 clockwise, the protrusions-10 move along the screw grooves 12 of the driving element 11, thereby forcing it to perform a downward movement due to the spline connection (the projections 13 of the driving element 11 with the grooves 14 of the housing 1), and consequently, In the drive element 11, spring-loaded bridge contacts 17-19. The ignition switch has four I-IV operating positions in which a strictly defined order is provided.

thirty

35

40

45

50

55

Well. When the rotary axis 9 is rotated to position III (the instrument and ignition circuits are closed), a pair of contact parts 22-23 of the bridging contacts 18 is pressed against a pair of fixed contacts 5-6 similarly to the previous pair of contact details 20-21, which in turn remains closed state, slipping on the surface of fixed contacts 3-4. In position IV, all circuits are closed, i.e. a pair of contact parts 24–25 of bridge contacts 19 is pressed against a pair of fixed contacts 7–8, while the previous fixed contacts 3-4, 5–6 continue to be in a closed state. When rotating the rotary axis 9 against the Hour hand, the chains are opened in the reverse order.

The design of the ignition switch, in which the drive element, having the possibility of reciprocating movement along the rotary axis along the slotted grooves of the housing, ensures the sliding of the bridge contacts along the fixed contacts, and, as a result, the self-cleaning of the working contact surfaces from the burning and oxides contacts with protrusions in the form of cams placed in the housing over each pair of fixed contacts, which allows switching by double breaking WA circuit and eliminate mechanical wear of contacts before closing and after opening the circuit.

unwinding of circuits according to the electrical circuit of the device At the beginning of the movement of the driving element 11 (position I - all circuits are open), the bridge contacts 17-19 are supported on the corresponding protrusions in the form of cams 26-28 of the housing 1. With the further movement of the driving element 11 to position II (the circuit of devices is closed) the bridge contacts 17 slide off protrusion 26 and due to the action of spring 24, a pair of contact parts 20-21 is pressed against a pair of fixed contacts 3-4. At the same time, other bridge contacts 18, 19 do not commute the circuits, since the corresponding protrusions in the form of cams 27, 28 are long and immobile.

five

0

five

0

five

0

five

Well. When the rotary axis 9 is rotated to position III (the instrument and ignition circuits are closed), a pair of contact parts 22-23 of the bridging contacts 18 is pressed against a pair of fixed contacts 5-6 similarly to the previous pair of contact details 20-21, which in turn remains closed state, slipping on the surface of fixed contacts 3-4. In position IV, all circuits are closed, i.e. a pair of contact parts 24–25 of bridge contacts 19 is pressed against a pair of fixed contacts 7–8, while the previous fixed contacts 3-4, 5–6 continue to be in a closed state. When rotating the rotary axis 9 against the Hour hand, the chains are opened in the reverse order.

The design of the ignition switch, in which the drive element, having the possibility of reciprocating movement along the rotary axis along the slotted grooves of the housing, ensures the sliding of the bridge contacts along the fixed contacts, and, as a result, the self-cleaning of the working contact surfaces from the burning and oxides contacts with protrusions in the form of cams placed in the housing over each pair of fixed contacts, which allows switching by double breaking WA circuit and eliminate mechanical wear of contacts before closing and after opening the circuit.

about

Claims (1)

Invention Formula An ignition switch, comprising a housing with grooves and fixed in it along its rotary axis fixed contacts of different lengths, a drive element made of insulating material with protrusions, carrying spring-loaded bridge contacts associated with the rotary axis and installed with the possibility of reciprocating movement so that its protrusions are inserted into the grooves of the housing, characterized in that, in order to increase reliability, circuit by reducing contact wear, fixed contacts are located in the housing in pairs, on the inner surface of the housing there are cam-shaped protrusions, each of which is located on one pair of fixed contacts, spring-loaded bridge contacts in the drive element are placed on the same level, and the drive element mounted with the possibility of reciprocating movement along the rotary axis and the interaction of spring-loaded bridge contacts with protrusions in the form of cams. g /four 73 27 d 5 sixteen .- 5678 j / 7OVr M. 11 LI . cp qz ± p IV / 7ff / ra.  4 4 q  five