CN114927363A

CN114927363A - Dustproof passenger car microswitch

Info

Publication number: CN114927363A
Application number: CN202210643423.XA
Authority: CN
Inventors: 郭琦; 盛黎明; 林庆杰
Original assignee: Wenzhou Gangyuan Electronics Co ltd
Current assignee: Wenzhou Gangyuan Electronics Co ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-08-19
Anticipated expiration: 2042-06-09
Also published as: CN114927363B

Abstract

The application relates to the field of micro switches, and particularly discloses a dust-proof micro switch for a passenger car, which comprises a shell and a pressing column arranged on the shell in a sliding manner, wherein an electric cavity is formed in the shell, a common terminal, a middle terminal and a side terminal are arranged in the electric cavity, the middle terminal is positioned between the common terminal and the side terminal, and the tip of pressing the post stretches into in the electric chamber, still include the contact piece, driving plate and shell fragment, the one end of contact piece is connected on common terminal, the other end of contact piece is provided with the movable contact, be provided with normally open contact on the limit terminal, be provided with normally closed contact on the well terminal, normally open contact and normally closed contact all are located the removal route of movable contact, the one end rotation of driving plate sets up in electric intracavity, the other end of driving plate is contradicted with the tip of pressing the post, the both ends of shell fragment are supported tight driving plate and contact piece respectively, the shell fragment is used for driving the contact piece and resets. The application has the effect of expanding the application range of the microswitch.

Description

Dustproof passenger car microswitch

Technical Field

The application relates to the field of micro switches, in particular to a dustproof passenger car micro switch.

Background

The micro switch is a contact mechanism, has the characteristics of sensitive switching on and off, small volume, small contact distance, high control precision and the like, is widely applied in the fields of electronic equipment, electric power systems, household appliances, instruments, meters, mines and the like, and plays an irreplaceable role.

In the related art, the micro switch includes a housing, a pressing block slidably disposed on the housing, a contact piece having elasticity, and three terminals, wherein the pressing block abuts against the contact piece and drives the contact piece to swing. The contact piece is connected with one of the terminals, the other two terminals are provided with static contacts, the contact piece is provided with a movable contact, and the movable contact is positioned between the two static contacts. When the circuit is switched, the pressing block is pressed downwards, and the pressing block swings in the direction of driving the end part of the contact piece to move towards the pressing block, so that the movable contact is abutted against one of the fixed contacts. After the force applied to the pressing block is removed, the contact piece is reset, so that the movable contact is abutted against the other fixed contact. Namely, the static contact towards the pressing direction of the pressing block is a normally closed contact, and the static contact back to the pressing direction of the pressing block is a normally open contact.

In the process of implementing the application, the inventor finds that at least the following problems exist in the technology: in the practical application of the micro switch, when a pressing block is pressed down in part of use scenes, a movable contact is abutted to a fixed contact back to the pressing direction of the pressing block, when the pressing block is not stressed, the movable contact is abutted to the fixed contact facing to the pressing direction of the pressing block, and the micro switch in the related technology cannot be realized, is small in application range and needs to be improved.

Disclosure of Invention

In order to enlarge the application range of the microswitch, the application provides the dustproof passenger car microswitch.

The application provides a dustproof passenger train micro-gap switch adopts following technical scheme:

a microswitch for a dustproof passenger car comprises a shell (1) and a pressing column (2) arranged on the shell (1) in a sliding mode, wherein an electrical cavity (13) is formed in the shell (1), a public terminal (131), a middle terminal (132) and an edge terminal (133) are arranged in the electrical cavity (13), the middle terminal (132) is located between the public terminal (131) and the edge terminal (133), the end portion of the pressing column (2) extends into the electrical cavity (13),

the contact piece structure is characterized by further comprising a contact piece (3), a driving piece (4) and an elastic piece (5), one end of the contact piece (3) is connected to a common terminal (131), a moving contact (33) is arranged at the other end of the contact piece (3), a normally open contact (136) is arranged on a side terminal (133), a normally closed contact (135) is arranged on a middle terminal (132), the normally open contact (136) and the normally closed contact (135) are located on a moving path of the moving contact (33), one end of the driving piece (4) is rotatably arranged in an electrical cavity (13), the other end of the driving piece (4) is abutted against the end portion of the pressing column (2), two ends of the elastic piece (5) are abutted against the driving piece (4) and the contact piece (3) respectively, and the elastic piece (5) is used for driving the contact piece (3) to reset;

when shell fragment (5) and contact piece (3) were all in natural state, moving contact (33) contradicted with normally closed contact (135), press the tip swing that the post (2) is used for driving piece (4) drive contact piece (3) to moving contact (33) to contradict with normally open contact (136), the direction when pressing the post (2) to remove and drive the tip of driving piece (4) and remove is the direction of pushing down, normally open contact (136) and normally closed contact (135) are arranged along the direction of pushing down in proper order.

By adopting the technical scheme, when the elastic sheet and the contact piece are not subjected to external force, namely the pressing column is not subjected to force, namely the elastic sheet and the contact piece are in natural states, the movable contact is abutted against the normally closed contact. When the circuit is switched, the pressing column is pressed downwards along the pressing direction, the pressing column is abutted against the driving sheet and drives the driving sheet to swing with the end part abutted against the pressing column, so that the elastic sheet is driven to compress and swing, the elastic sheet transmits force until the end part of the contact sheet provided with the movable contact swings to the movable contact and is abutted against the normally open contact. After the force applied on the pressing column is removed, the contact piece is reset under the action of the elastic sheet, so that the contact point moves to be in contact with the normally closed contact again.

The microswitch arranged in this way enables the normally open contact in the direction opposite to the pressing direction to be abutted against the movable contact when the pressing column is pressed down, and enables the normally closed contact in the direction opposite to the pressing direction to be abutted against the movable contact when no force is applied to the pressing column. Namely, under the condition of not changing the wiring mode of the middle terminal and the side terminal, different circuit connection modes are realized.

The design is ingenious, and the application range of the microswitch is expanded.

Optionally, the contact piece is provided with a connecting block, and the elastic piece is provided with a connecting hole for the connecting block to be inserted.

Through adopting above-mentioned technical scheme, when connecting shell fragment and contact piece, insert the connecting hole with the connecting block to the relative contact piece of tip that restriction shell fragment and contact piece were contradicted removes, has improved the stability that shell fragment and contact piece are connected.

Optionally, the elastic sheet includes a convex arc sheet, a front sheet abutting against the contact sheet, and a rear sheet abutting against the driving sheet, the convex arc sheet protrudes along the pressing direction, and the front sheet and the rear sheet are respectively connected to two ends of the convex arc sheet.

By adopting the technical scheme, when the elastic sheet is installed, the front sheet and the rear sheet move oppositely, so that the convex radian of the convex arc sheet is increased. And then the front piece is abutted against the contact piece, the rear piece is abutted against the driving piece, and the elastic piece is in a pre-tightening state at the moment, so that the front piece is abutted against the contact piece, and the rear piece is abutted against the contact piece. Because the convex arc piece is protruding along the direction of pushing down, the force towards the direction of pushing down is exerted to the contact piece through the anter to the convex arc piece of slight bending to make the movable contact can keep supporting tightly normally closed contact, avoided the production of drawing the arc phenomenon as far as possible.

Optionally, be provided with the support in the electric chamber, it is protruding to be provided with the rotation on the support, the driving plate includes the connecting strip, connects at the coupling hook of connecting strip one end and connects and keep away from the pretension piece that presses post one side at the coupling hook, the coupling hook colludes to establish on rotating the arch, the back plate has been kept away from and has been seted up the pretension groove on the terminal surface of protruding arc piece, the tip of pretension piece stretches into the pretension groove, just the tip of pretension piece and the cell wall of propping tight pretension groove.

By adopting the technical scheme, when the driving piece is installed, the connecting hook is hooked on the rotating protrusion, the front piece and the rear piece are pressed to increase the protruding radian of the convex arc piece, and finally the front piece is pressed against the contact piece, the pre-tightening block is installed in the pre-tightening groove, and the end part of the pre-tightening block is pressed against the groove wall of the pre-tightening groove. Through the structure, the elastic sheet not only plays a role in resetting the contact piece, but also plays a role in installing and fixing the driving piece.

Optionally, the casing includes base and apron, the electric chamber is enclosed to close by base and apron and forms, be provided with the sealing washer between base and the apron, base and apron all contradict with the sealing washer.

Through adopting above-mentioned technical scheme, the split type design of base and apron, the installation of the normally open contact of being convenient for, normally closed contact, contact piece, shell fragment, driving plate, support and pressing post. The sealing washer has restricted during dust and water get into electric chamber from the clearance between base and the apron, has improved this application micro-gap switch's dustproof and waterproof performance.

Optionally, a sealing ring groove is formed in the end face, facing the base, of the cover plate, and the end portion of the sealing ring is inserted into the sealing ring groove.

Through adopting above-mentioned technical scheme, the tip of sealing washer is inserted and is established in the seal ring groove, has restricted the sealing washer to take place to slide on base and apron, helps the sealing washer installation on the one hand, and on the other hand has further improved this application micro-gap switch's dustproof and waterproof performance.

Optionally, the base is integrally injection-molded, and the public terminal, the middle terminal and the side terminal are all adhered to the base when the base is integrally molded.

Through adopting above-mentioned technical scheme, public terminal, well terminal and limit terminal all glue when base integrated into one piece establish with the base on, not only reduced the installation procedure, still improved this application micro-gap switch's structural strength, further improved this application micro-gap switch's dustproof and waterproof performance simultaneously.

Optionally, set up the sliding tray that is linked together with electric chamber on the apron, press the post and slide and set up in the sliding tray, the one end of pressing the post stretches out outside the casing, the tip cover of pressing the post outside the casing is equipped with the seal cover, the seal cover is fixed on the apron, just the seal cover shields the opening that electric chamber was kept away from to the sliding tray.

Through adopting above-mentioned technical scheme, the seal cover has shielded the sliding tray and has kept away from the opening in electric chamber to during having restricted dust and water to get into electric chamber through the sliding tray, pressing the normal gliding colleague of post at the assurance, improved this application micro-gap switch's dustproof and waterproof performance.

Optionally, be provided with the stopper on the contact patch, be provided with the gag lever post on the lateral wall of connecting strip, be provided with on the stopper and be used for the spacing face with conflicting, spacing face extends along the rotation direction of gag lever post, when pressing the post and removing along pushing down the direction and reaching the maximum stroke, the gag lever post staggers with spacing face.

Through adopting above-mentioned technical scheme, during the switching circuit, push down and press the depression bar, press the tip of depression bar and support to press and drive the driver blade and rotate on the driver blade, the tip of driver blade supports to press and drives the back part and move to the direction that is close to the anter on the bullet piece to make the protruding radian of protruding arc piece increase, the shell fragment energy storage. The driving sheet drives the limiting rod to move when rotating, and the limiting rod is pressed on the limiting surface to limit the contact sheet to swing under the action of the elastic sheet. When the pressing column moves in the pressing direction to reach the maximum stroke, the convex arc piece reaches the maximum deformation degree under the action of the driving piece and the pressing column, namely the energy storage of the elastic piece reaches the maximum value, the limiting rod is staggered with the limiting surface at the moment, the elastic piece releases force and drives the end part of the contact piece provided with the movable contact to move quickly, and therefore the effect that the movable contact is quickly disconnected with the normally closed contact and is quickly contacted with the normally open contact is achieved. Through the structure, the micro switch realizes quick on-off, reduces the generation of arc discharge phenomenon, and plays a role in protecting the movable contact, the normally closed contact and the normally open contact.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the pressing column is pressed downwards along the pressing direction, the movable contact is abutted against the normally closed contact in the back pressing direction through linkage of the driving sheet, the elastic sheet and the contact sheet, and after the force applied to the pressing column is removed, the contact sheet is reset until the movable contact is abutted against the normally closed contact under the action of the elastic sheet; through the structure, the microswitch realizes different circuit connection and connection modes under the condition of not changing the wiring mode of the middle terminal and the side terminal, and enlarges the application range of the microswitch;

2. the middle terminal, the side terminal and the public terminal are adhered to the base when the base is integrally formed through the sealing ring, the sealing ring groove and the sealing sleeve, so that the dustproof and waterproof performance of the microswitch is greatly enhanced, and the service life of the microswitch is prolonged;

3. through stopper, spacing face and stopper for this application micro-gap switch can realize quick break-make, has reduced the production of drawing the arc phenomenon, thereby plays the guard action to movable contact, normally closed contact and normally open contact.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present application.

Fig. 2 is a schematic sectional view of the present application with the lever and the roller removed in embodiment 1.

Fig. 3 is a schematic cross-sectional view of a contact piece shown in the embodiment 1 of the present application.

Fig. 4 is a schematic structural view of the protruding limiting block and the limiting rod in embodiment 2 of the present application.

Description of reference numerals:

1. a housing; 11. a base; 12. a cover plate; 121. sealing the ring groove; 122. a sealing groove; 123. a sliding groove; 124. a lever; 125. a roller; 13. an electrical cavity; 131. a common terminal; 132. a middle terminal; 133. a side terminal; 134. an extension terminal; 135. a normally closed contact; 136. a normally open contact; 14. a seal ring; 15. a sealing sleeve; 2. pressing the column; 3. a contact piece; 31. a yielding groove; 32. connecting blocks; 33. a movable contact; 4. a driving plate; 41. a connecting hook; 42. a connecting strip; 421. a limiting rod; 43. a pre-tightening block; 5. a spring plate; 51. a front panel; 511. connecting holes; 52. a convex arc sheet; 53. a rear panel; 531. pre-tightening the groove; 6. a support; 61. rotating the projection; 62. a through hole; 7. a limiting block; 71. a supporting block; 72. a limit stop; 721. a limiting surface.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses dustproof passenger train micro-gap switch.

Example 1:

referring to fig. 1, dustproof passenger car micro-gap switch includes casing 1, and casing 1 includes base 11 and apron 12, and the sliding is provided with on apron 12 and presses post 2. The base 11 and the cover 12 enclose an electrical cavity 13, and the electrical cavity 13 is provided with a common terminal 131, a middle terminal 132, a side terminal 133, a contact piece 3, a driving piece 4, an elastic piece 5 and a bracket 6.

Referring to fig. 2, a sealing ring groove 121 is formed on an end surface of the cover plate 12 facing the base 11, a sealing ring 14 is disposed between the cover plate 12 and the base 11, and the sealing ring 14 is an elastic rubber ring. The end of the sealing ring 14 is inserted into the sealing ring groove 121, and the two ends of the sealing ring 14 respectively abut against the cover plate 12 and the groove wall of the sealing ring groove 121.

Referring to fig. 2, a sealing groove 122 and a sliding groove 123 communicating with the sealing groove 122 are opened on an end surface of the cover plate 12 away from the base 11, the sliding groove 123 penetrates through the cover plate 12 and communicates with the electrical cavity 13, and the pressing rod 2 is slidably disposed in the sliding groove 123. One end of the pressing column 2 extends out of the shell 1, and the other end of the pressing column 2 extends into the electric cavity 13. The end part of the pressing column 2 outside the housing 1 is sleeved on the sealing sleeve 15, the end part of the sealing sleeve 15 is inserted into the sealing groove 122 and is fixedly connected with the groove bottom of the sealing groove 122, and the sealing sleeve 15 shields the opening of the sliding groove 123 far away from the electrical cavity 13.

Referring to fig. 1 and 2, a lever 124 is disposed on the cover plate 12, one end of the lever 124 is hinged to the cover plate 12, a roller 125 is rotatably disposed on the other end of the lever 124, an end of the sealing sleeve 15 abuts against the lever 124, and the abutting point of the sealing sleeve 15 and the lever 124 is located between the hinged point of the lever 124 and the roller 125. By pressing the roller 125 toward the cover 12, the lever 124 swings and pushes the sealing sleeve 15 to deform, thereby driving the pressing column 2 to move, and the moving direction of the pressing column 2 is the pressing direction.

Referring to fig. 2, the base 11 is integrally injection molded, the common terminal 131, the middle terminal 132 and the side terminal 133 are all adhered to the base 11 when the base 11 is integrally molded, one end of each of the common terminal 131, the middle terminal 132 and the side terminal 133 extends into the electrical cavity 13, and the other end extends out of the base 11. The middle terminal 132 is located between the common terminal 131 and the side terminal 133, the middle terminal 132 and the side terminal 133 are fixed with extension terminals 134, the extension terminal 134 of the middle terminal 132 is fixed with a normally closed contact 135, and the extension terminal 134 of the side terminal 133 is fixed with a normally open contact 136.

Referring to fig. 3, contact piece 3 is made of conductive metal, one end of contact piece 3 is abutted against common terminal 131, movable contact 33 is fixed to the other end of contact piece 3, normally closed contact 135 and normally open contact 136 are both located on the moving path of movable contact 33, and normally open contact 136 and normally closed contact 135 are arranged in the pressing direction. The contact piece 3 is penetrated with a relief groove 31, and the relief groove 31 is used for the end parts of the elastic piece 5 and the driving piece 4 to extend into. The groove wall of the relief groove 31 close to the movable contact 33 is provided with a connecting block 32, and the connecting block 32 is integrally formed on the contact piece 3.

Referring to fig. 2 and 3, the end of the contact piece 3 that abuts against the common terminal 131 is located between the holder 6 and the common terminal 131, the holder 6 abuts against the contact piece 3, and the holder 6 and the contact piece 3 are fixed to the base 11 by caulking. Support 6 keeps away from the tip integrated into one piece of self riveting end has rotation arch 61, runs through the through-hole 62 that has the orientation of pushing down to extend on the support 6, and through-hole 62 is used for supplying the tip that presses post 2 to stretch into and slide the setting.

Referring to fig. 3, the driving plate 4 includes a coupling hook 41, a coupling bar 42, and two pre-tightening blocks 43, the coupling hook 41 being integrally formed at one end of the coupling bar 42 in the longitudinal direction thereof, and the two pre-tightening blocks 43 being integrally formed at the other end of the coupling bar 42 in the longitudinal direction thereof. The connecting hook 41 is hooked on the rotating protrusion 61 and can rotate on the rotating protrusion 61, and one end of the connecting strip 42, which is far away from the connecting hook 41, extends into the through hole 62 and is abutted against the pressing column 2.

Referring to fig. 1, the elastic sheet 5 is used for driving the contact piece and the driving piece 4 to reset, the elastic sheet 5 includes a front sheet 51, a convex arc sheet 52 and a rear sheet 53, and the convex arc sheet 52 protrudes in the pressing direction. The front sheet 51 and the rear sheet 53 are both disposed obliquely, the inclination directions of the front sheet 51 and the rear sheet 53 are opposite, and the front sheet 51 and the rear sheet 53 are integrally formed at both ends of the convex arc sheet 52, respectively. The front piece 51 extends into the avoiding groove 31 and the front piece 51 is pressed against the groove wall of the avoiding groove 31, a connecting hole 511 penetrates through the front piece 51, and the connecting block 32 is inserted into the connecting hole 511. The end face of the rear piece 53, which is far away from the convex arc piece 52, is provided with a pre-tightening groove 531, the end parts of the two pre-tightening blocks 43 are inserted into the pre-tightening groove 531, and the end parts of the pre-tightening blocks 43 abut against the groove wall of the pre-tightening groove 531.

Referring to fig. 3, the pressing column 2 is used to drive the end of the connecting bar 42 to drive the end of the contact piece 3 to swing until the moving contact 33 is abutted against the normally open contact 136, and when the pressing column 2 moves in the pressing direction, the pressing column 2 drives the end of the driving piece 4 to move. When the pressing rod 2 is not pressed down in the pressing direction, that is, when the spring 5 and the contact piece 3 are not subjected to an external force, the spring 5 and the contact piece 3 are in a natural state and the moving contact 33 abuts against the normally closed contact 135.

The implementation principle of the embodiment 1 of the application is as follows: when the pressing column 2 is not stressed, because the convex arc piece 52 protrudes along the pressing direction, and the front piece 51 is obliquely arranged and abuts against the groove wall of the yielding groove 31, the front piece 51 applies a force towards the pressing direction to the contact piece 3, so that the contact piece 3 applies a force towards the pressing direction to the movable contact 33, the movable contact 33 abuts against the normally closed contact 135, and at the moment, the common terminal 131 is communicated with the middle terminal 132.

When the circuit is switched, the roller 125 is pressed, the roller 125 drives the lever 124 to swing, the lever 124 presses against the sealing sleeve 15 and deforms the sealing sleeve 15, and the sealing sleeve 15 transmits force to the pressing column 2 and drives the pressing column 2 to move in the downward pressing direction. The pressing column 2 is pressed against the end of the connecting strip 42 far away from the connecting hook 41, the end of the connecting strip 42 far away from the connecting hook 41 rotates and drives the pre-tightening block 43 to rotate, so that the rear piece 53 moves towards the direction close to the front piece 51 and the direction far away from the cover plate 12, and the convex radian of the convex arc piece 52 is increased, namely the compression amount of the elastic piece 5 is increased. Until the elastic sheet 5 deforms and swings to the end part of the contact piece 3 provided with the movable contact 33 to swing, at the moment, the stored energy of the elastic sheet 5 is released to drive the end part of the contact piece 3 provided with the movable contact 33 to swing to be abutted against the movable contact 33 and the normally open contact 136. After the force applied to the pressing column 2 is removed, the contact piece 3 is reset under the action of the spring piece 5 and the contact piece 3 until the movable contact 33 is abutted against the normally closed contact 135.

With the above configuration, when the pressing rod 2 is pressed down, the normally open contact 136 facing away from the pressing direction can abut against the movable contact 33, and when no force is applied to the pressing rod 2, the normally closed contact 135 facing the pressing direction abuts against the movable contact 33. Under the condition that the wiring mode of the middle terminal 132 and the side terminal 133 is not changed, the microswitch realizes different circuit connection modes, and the application range of the microswitch is expanded.

Example 2:

referring to fig. 2, the difference between this embodiment and embodiment 1 is that two opposite groove walls of the receding groove 31 are respectively provided with a limiting block 7, each limiting block 7 includes a supporting block 71 fixed on the contact piece 3 and a limiting block 72 fixed on one side of the supporting block 71 close to the bracket 6, and an end surface of the limiting block 72 facing away from the supporting block 71 is a limiting surface 721. The two opposite side walls of the connecting bar 42 are fixed with two position-limiting rods 421, the two position-limiting rods 421 respectively abut against the position-limiting surfaces 721 on the different position-limiting stoppers 72, and the position-limiting surfaces 721 extend along the rotation direction of the position-limiting rods 421. When the pressing rod 2 moves in the pressing direction until the pressing rod cannot move further, that is, the pressing rod 2 reaches the maximum stroke of moving in the pressing direction, at this time, both the two limit rods 421 are staggered from the adjacent limit surfaces 721.

The implementation principle of embodiment 2 of the present application is as follows: when the roller 125 is pressed, the roller 125 drives the pressing rod 2 to move along the pressing direction through the lever 124, and the pressing rod 2 pushes the connecting strip 42 to rotate away from the end of the connecting hook 41, so as to drive the limiting rod 421 to rotate. Along with pressing the post 2 and moving along the direction of pushing down gradually, gag lever post 421 slides on spacing face 721, shell fragment 5 progressively compresses, gag lever post 421 and stopper 7 have restricted contact piece 3 and have swung under the effect of shell fragment 5, until pressing post 2 and moving along the direction of pushing down and reach the maximum stroke, shell fragment 5 reaches the maximum deformation degree under pressing post 2 and the effect of drive plate 4, shell fragment 5 energy storage reaches the biggest promptly, gag lever post 421 staggers with spacing face 721, make the energy storage of shell fragment 5 release in the twinkling of an eye, thereby drive contact piece 3 quick swing, movable contact 33 and normally closed contact 135 quick separation and contact with normally open contact 136 fast, the effect of quick break-make has been realized.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a dustproof passenger train micro-gap switch, includes casing (1) and slides and set up pressing post (2) on casing (1), electric chamber (13) have been seted up on casing (1), be provided with public terminal (131), well terminal (132) and limit terminal (133) in electric chamber (13), well terminal (132) are located between public terminal (131) and limit terminal (133), just the tip that presses post (2) stretches into in electric chamber (13), its characterized in that:

2. The dust-proof micro switch for the passenger car according to claim 1, wherein: the contact piece (3) is provided with a connecting block (32), and the elastic piece (5) is provided with a connecting hole (511) for the connecting block (32) to be inserted.

3. The microswitch of claim 1, wherein: the elastic sheet (5) comprises a convex arc sheet (52), a front sheet (51) abutting against the contact sheet (3) and a rear sheet (53) abutting against the driving sheet (4), the convex arc sheet (52) protrudes along the downward pressing direction, and the front sheet (51) and the rear sheet (53) are respectively connected to two ends of the convex arc sheet (52).

4. The dust-proof micro switch for the passenger car according to claim 3, wherein: be provided with support (6) in electric chamber (13), be provided with on support (6) and rotate protruding (61), driving plate (4) are including connecting strip (42), connect connecting hook (41) and the connection of connecting hook (41) one end and keep away from pressing in advance tight piece (43) of post (2) one side in connecting hook (41), connecting hook (41) collude and establish on rotating protruding (61), lug (53) are kept away from and are seted up on the terminal surface of protruding arc piece (52) pretension groove (531), the tip of pretension piece (43) stretches into pretension groove (531), just the tip of pretension piece (43) and the cell wall that supports tight pretension groove (531).

5. The dust-proof micro switch for the passenger car according to claim 4, wherein: casing (1) includes base (11) and apron (12), electric chamber (13) are enclosed by base (11) and apron (12) and close and form, be provided with between base (11) and apron (12) sealing washer (14), base (11) and apron (12) all contradict with sealing washer (14).

6. The dust-proof micro switch for the passenger car according to claim 5, wherein: the end face, facing the base (11), of the cover plate (12) is provided with a sealing ring groove (121), and the end part of the sealing ring (14) is inserted into the sealing ring groove (121).

7. The microswitch of claim 5, wherein: the base (11) is integrally formed by injection molding, and the public terminal (131), the middle terminal (132) and the side terminal (133) are adhered to the base (11) when the base (11) is integrally formed.

8. The dust-proof micro switch for the passenger car according to claim 5, wherein: offer sliding tray (123) that are linked together with electric chamber (13) on apron (12), slide to set up in sliding tray (123) according to compression leg (2), the one end of pressing leg (2) is stretched out outside casing (1), press compression leg (2) and be equipped with seal cover (15) in the outer tip cover of casing (1), seal cover (15) are fixed on apron (12), just seal cover (15) shield sliding tray (123) and keep away from the opening of electric chamber (13).

9. The dust-proof micro switch for the passenger car according to claim 8, wherein: be provided with stopper (7) on contact piece (3), be provided with gag lever post (421) on the lateral wall of connecting strip (42), be provided with spacing face (721) that is used for with the conflict on stopper (7), the direction of rotation of gag lever post (421) is extended in spacing face (721), when pushing down the direction removal and reaching the biggest stroke according to compression leg (2), gag lever post (421) stagger with spacing face (721).