CN101504899A

CN101504899A - Improved structure for electromagnetic switch for starter

Info

Publication number: CN101504899A
Application number: CNA200910007079XA
Authority: CN
Inventors: 平林崇; 仓泽忠博; 宇佐见伸二
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2004-11-08
Filing date: 2005-11-08
Publication date: 2009-08-12
Also published as: JP2006134773A; JP4297036B2; CN1819093A; CN100530483C

Abstract

An electromagnetic switch for use in actuating a starter for automotive vehicles is provided. The switch includes fixed contacts, a moving contact, and a plunger shaft. The moving contact is joined to a plunger shaft through an insulator. The plunger shaft is to be moved magnetically to bring the moving contact into abutment with the fixed contact to establish electric communication between the fixed contact. The switch also includes a rotation holder working to hold the moving contact and the insulator from rotating relative to each other. Use of the rotation holder results in a decrease in wear of the insulator. This eliminates the need for the insulator to have an additional thickness which would be worn down, thus permitting the insulator to be reduced in thickness to shorten the overall length of the switch.

Description

The improvement structure that is used for the electromagnetic switch of starter

The application be that November 8, application number in 2005 are 200510137345.2 the applying date, denomination of invention divides an application for the application for a patent for invention of " the improvement structure that is used for the electromagnetic switch of starter ".

The cross reference of pertinent literature

Japanese patent application No.2004-324189,2004-324212,2004-364584 and 2004-366398 that the application requires to submit to respectively on November 8th, 2004, on November 8th, 2004, on December 16th, 2004, on December 17th, 2004 are as priority, and its disclosed content proposes as a reference in the lump at this.

Technical field

The present invention relates generally to and a kind ofly be used to disconnect or the electromagnetic switch of the contact of the motor driver of closed car engine start device.

Background technology

Known electromagnetic switch with the motor driver that is used for engine primer.For example, Japan Patent publication number No.3-969 first discloses a kind of electromagnetic switch, and it comprises the movable contact on a pair of fixed contact that is connected with motor driver and an end that remains on plunger axis by insulating part.This movable contact near fixed contact, is set up electric connection by plunger axis between fixed contact, to handle motor driver.

Above-mentioned switch has the movable contact of rotatably installing with respect to this insulating part, can run into some defectives, relatively rotate the wearing and tearing that cause insulating part between movable contact that causes owing to the mechanical oscillation of switch and the insulating part, the size of insulating part is increased to is enough to compensate this wearing and tearing, will cause the increase of switch overall dimensions thus.

When this movable contact during, will form physical impact to insulating part near fixed contact.This insulating part must have the enough big mechanical strength of bearing this impact thus.Particularly when this insulating part is formed from a resin, importantly will design the intensity of the welding point in the recurrent insulating part in molding process, and the mechanical strength of this welding point is littler than the mechanical strength of the remainder of insulating part.Specifically, this welding point must have than being enough to bear by movable contact and is applied to the bigger intensity of peak load on this insulating part.This need increase the thickness of insulating part, causes the increase of this switch entire length thus.

International open No.WO 00/26533, Japan Patent No.3152248 and Japan Patent disclose the electromagnetic switch that No.2003-184710 discloses the above-mentioned type first.

Summary of the invention

Therefore main purpose of the present invention is to avoid the shortcoming of prior art.

Another object of the present invention is to provide a kind of improved structure that is used for the electromagnetic switch of starter, it is designed to have bigger mechanical strength and little size.

Further purpose of the present invention is to provide a kind of electromagnetic switch that is used for starter, and it is compacter that it is built under the situation of not sacrificing its mechanical strength size.

The electromagnetic switch of having used when according to an aspect of the present invention, providing a kind of starter that starts automobile engine.This electromagnetic switch comprises: (a) plunger that is attracted by electromagnetic force; (b) fixed contact that is connected with the motor circuit of starter; (c) be used between fixed contact, setting up the movable contact of electric connection; (d) keep the plunger axis of movable contact by insulating part, this plunger be used for along with plunger by magnetic attachment and mobile movable contact makes movable contact near fixed contact, thereby set up electric connection betwixt; And (e) be arranged on rotation keeper between movable contact and the insulating part.This rotation keeper is used to prevent that movable contact and insulating part from relatively rotating with respect to each other.

The use of rotating keeper has reduced the wearing and tearing of insulating part.This makes insulating part not need to have the extra thickness that is worn, and allows insulating part to be reduced on thickness thus, thereby has shortened the entire length of switch.

In preference pattern of the present invention, movable contact is held in and makes movable contact basically at the same area bump fixed contact.Insulating part is formed by resin molded, and wherein the welding point is formed on the position beyond the insulating part part, and when plunger was made movable contact near fixed contact by magnetic attachment, this insulating part had acted on maximum impact load on partly.

This welding point can be formed on to be had when plunger is made movable contact near fixed contact by magnetic attachment on the insulating part part of minimal impact load effect on it.

This switch also comprises Contact Cover, and it covers fixed contact and movable contact.Movable contact is kept at the inwall of its periphery by Contact Cover, rotates to prevent it, and can move on the axis direction of Contact Cover.

Rotating keeper can be made of recess that forms in movable contact and the projection that forms on insulating part, and this projection is installed in the recess, is used for preventing that movable contact and insulating part from relatively rotating with respect to each other.Can form the welding point it occurs in this projection.

According to second aspect present invention, a kind of electromagnetic switch that is used for starter is provided, it comprises: the iron core that (a) is used to form the part magnetic circuit; (b) be arranged in the plunger that bears magnetic attachment on the first direction towards iron core; (c) a pair of fixed contact that is connected with the motor circuit of starter; (d) be fixed to the axle of plunger; (e) by insulating part be installed in the axle the end on movable contact, along with coupled columns is filled in capable sucking action, this movable contact faces the spring pressure that is generated by spring and moves on first direction, thereby sets up electric connection when switch closed position between fixed contact; (f) be arranged on spring between iron core and the plunger, promote the spring pressure of plunger on the second direction opposite to be created on, thereby make plunger be in the switch open position away from iron core with first direction; And the recess that (g) on the end face of iron core relative with plunger, forms, have striking face in the bottom of this recess, when the spring pressure of spring makes plunger when switch closed position turns back to the switch open position, this striking face is clashed in the end of insulating part.

Specifically, when insulating part during near the striking face of iron core, with unshakable in one's determination overlapping, promptly insulating part partly enters iron core to insulating part on the ground, radially top of switch.This structure allows insulating part to be increased on thickness, and does not need to increase the entire length of switch.The increase of the thickness t of insulating part causes the increase of insulating part mechanical strength.

In preference pattern of the present invention, recess has a degree of depth, and this degree of depth is the distance between striking face and the unshakable in one's determination end face.This degree of depth is less than the thickness of insulating part.

Plunger is arranged in the yoke, has first gap between the inwall of the periphery of plunger and yoke.Insulating part is arranged in the recess, has second gap between the interior week of the periphery of insulating part and recess.Second gap is greater than first gap.When plunger was offset diametrically or tilts, this prevented that insulating part from overlapping on the end face unshakable in one's determination, guaranteed that thus plunger is away from the stability in the return course unshakable in one's determination.

According to a third aspect of the invention we, provide a kind of electromagnetic switch that is used for starter, it comprises: the iron core that (a) is used to form the part magnetic circuit; (b) be arranged in the plunger that bears magnetic attachment on the first direction towards iron core; (c) a pair of fixed contact that is connected with the motor circuit of starter; (d) be fixed to the axle of plunger; (e) by insulating part be installed in the axle the end on movable contact, along with coupled columns is filled in capable sucking action, this movable contact faces the spring pressure that is generated by spring and moves on first direction, thereby sets up electric connection when switch closed position between fixed contact; (f) be arranged on spring between iron core and the plunger, promote the spring pressure of plunger on the second direction opposite to be created on, thereby make plunger be in the switch open position away from iron core with first direction; (g) recess that forms on the end face of iron core relative with plunger has striking face at the inner bottom surface of this recess, and striking face shrinks from this end face taper; And the retainer face that shrinks of the taper that (h) on insulating part, forms, it is installed on the striking face of recess, and when the spring pressure by spring makes plunger when switch closed position turns back to the switch open position, it is used for the motion of stop plunger.

When the effect by spring makes plunger return away from iron core, the retainer face that the taper of insulating part is shunk is installed on the striking face of taper contraction unshakable in one's determination, make insulating part overlapping with iron core on the ground, radially top of switch, promptly insulating part partly enters fixed core.This structure allows insulating part to be increased on thickness, and does not need to increase the entire length of switch.The increase of insulating part thickness causes the increase of insulating part mechanical strength.

The engagement of this taper contraction retainer face of insulating part and taper contraction striking face unshakable in one's determination has improved the precision in the centrally aligned axle process, has guaranteed the stability of assembled switch in starter thus.This engagement also makes the inclination of insulating part or deflection minimize, thereby avoids undesirable bias force to be applied on the insulating part, allows the mechanical strength of insulating part to be selected to thus and minimizes.This allows insulating part to be made by not expensive material.

In preference pattern of the present invention, when the retainer face is arranged near striking face, between iron core and movable contact, set up the gap.

According to a forth aspect of the invention, provide a kind of electromagnetic switch that is used for starter, it comprises: (a) the cylinder switch main body of hollow, be provided with within it at the upwardly extending fixed core in switch main body footpath, and this fixed core forms the part magnetic circuit; (b) connect the Contact Cover of the end of switch main body in its end, this Contact Cover is limited with a chamber within it, is provided with movable contact in this chamber, and this movable contact is moved by magnetic attachment ground by switch main body, makes its close fixed contact or away from fixed contact; And (c) be arranged on sealing ring between Contact Cover end and the fixed core end face.The end of this Contact Cover is formed with annular, outer face and internal end surface.This annular, outer face extends outside the chamber, and faces the thickness of external compression sealing ring of the end face of fixed core.Internal end surface is to the inner extension of annular, outer face, the not thickness of compression seal ring.Sealing ring comprises annular, outer heavy wall pipe inner thin-walled.This annular, outer heavy wall is arranged in the clip that the end face by the annular, outer face of Contact Cover and fixed core forms.This inner thin-walled is extended towards the inside of the annular, outer heavy wall between the end face of the internal end surface of Contact Cover and fixed core.

When Contact Cover was connected with switch main body, the inner thin-walled of sealing ring was arranged between the end face of the internal end surface of Contact Cover and fixed core.Its thickness of this inner thin-walled is less than outside heavy wall, and when Contact Cover was connected with switch main body, it is littler than the thickness of outside heavy wall that its thickness is compressed into.This will make and face fixed core push the required surging of Contact Cover and be minimized when Contact Cover firmly is connected with switch main body, and need not sacrifice the sealability of sealing ring.This inner thin-walled can be made of the case chip that is connected with the annular, outer heavy wall, and undesirable distortion of the sealing ring when it is installed in switch main body is minimized, and becomes easy thereby make to install.

In preference pattern of the present invention, the outside heavy wall of sealing ring comprises annular, outer part and a plurality of interior sections that partly extend internally from this annular, outer, and this inner thin-walled is made up of a plurality of parts that are connected with the interior section of outside heavy wall.

The interior section of this inner thin-walled and annular, outer heavy wall defines the window in the face of the chamber of Contact Cover together.

The inner thin-walled of sealing ring can have facing surfaces, and this surface is from the recessed identical degree of depth of annular, outer heavy wall.

Sealing ring is formed with terminal hole and location hole, and lead passes terminal hole and extends, and for the magnet exciting coil that is provided with in the switch main body provides electric power, makes the end sections of Contact Cover be arranged to end face near fixed core by location hole.The annular, outer heavy wall extends into around terminal hole and location hole.

According to a fifth aspect of the invention, provide a kind of electromagnetic switch that is used for starter, it comprises: (a) the cylinder switch main body of hollow, be provided with within it at the upwardly extending fixed core in switch main body footpath, and this fixed core forms the part magnetic circuit; (b) connect the Contact Cover of the end of switch main body in its end, this Contact Cover is limited with a chamber within it, is provided with movable contact in this chamber, and this movable contact is moved by magnetic attachment ground by switch main body, makes its close fixed contact or away from fixed contact; And (c) be arranged on sealing ring between Contact Cover end and the fixed core end face.The end of this Contact Cover is formed with annular, outer face and internal end surface.This annular, outer face extends outside the chamber, and faces the thickness of external compression sealing ring of the end face of fixed core.Inner face extends to the annular, outer face is inner, the thickness of compression seal ring not, and recessed from the annular, outer face.Sealing environment protecting is held between the end face of the annular, outer face of Contact Cover and fixed core and between the end face of the internal end surface of Contact Cover and fixed core.

According to a sixth aspect of the invention, provide a kind of electromagnetic switch that is used for starter, it comprises: (a) switch main body; (b) Contact Cover that is connected with switch main body, this Contact Cover is formed with contact cavities within it; (c) be arranged on the interior plunger axis of switch main body, it has the end of the contact cavities of the Contact Cover of being exposed to, but this plunger axis moves to the quilt magnetic attachment on its axis direction; (d) remain on movable contact on the end of plunger axis, this movable contact upwards extends in the footpath of plunger axis; (e) the first and second fixed contact rod members, it extends through Contact Cover on the axis direction of plunger axis, have first and second heads that expose in the contact cavities inside of Contact Cover, this first and second head has first and second contacts in the face of the movable contact surface, when making the movable contact surface near first and second fixed contacts by plunger axis mobile, it forms between first and second fixed contacts and electrically contacts; And first and second projectioies that (f) on first and second heads of the first and second fixed contact rod members, form, it defines first and second fixed contacts respectively.

Specifically, the fixed contact rod member has projection or towards the fixed contact of the axis bias of plunger axis, allow the length of movable contact to be reduced thus, and guaranteed the whole surface of fixed contact and contacting of movable contact, and do not need to reduce the interval between the fixed contact rod member.

In preference pattern of the present invention, first and second heads of the first and second fixed contact rod members separate each other one at interval, it allows the part of plunger axis to extend towards the first and second fixed contact rod members from movable contact, enter between first and second fixed contacts, but contact without any physics with it.

First and second heads of the first and second fixed contact rod members with and the be in line dummy line of extending of the longitudinal centre line of plunger axis intersect and arrange.The center of first and second contacts is nearer than the described dummy line of the centre distance of first and second heads.

First and second contacts are nearer apart from this dummy line on perpendicular to the direction of this dummy line than the longitudinal centre line of the first and second fixed contact rod member main bodys except that first and second heads.

Between the longitudinal centre line of plunger axis and the outermost end of movable contact the ultimate range that plunger axis directly makes progress be substantially equal to or greater than the dummy line and first and second fixed contacts in the ultimate range that makes progress in the footpath of plunger axis between the outermost end of at least one fixed contact.

Abut one another the zone of first and second fixed contacts that electrically contact with formation between first and second fixed contacts and the rectangular shape of zone for limiting of movable contact by first opposite side and second opposite side, this first opposite side is arranged essentially parallel to the straight-line extension that directly upwards passes the first and second fixed contact rod members at plunger axis, and this second opposite side is substantially perpendicular to first opposite side and extends.

Because the wearing and tearing of first and second fixed contacts, each first and second projection the original depth of plunger axis on axially than allow movable contact plunger axially on big from movable contact near the distance that the initial position of first and second fixed contacts begins to advance.

The zone of each first and second head of the first and second fixed contact rod members except that the zone of a corresponding projection that forms first and second projectioies thereon can have rough surface.

The thermal conductivity of the main body of each first and second fixed contact rod member can be lower than the thermal conductivity of first and second projectioies.

Description of drawings

By the accompanying drawing of the following detailed description that provides and the preferred embodiment of the present invention, invention will be more fully understood, and, the present invention is not limited to these specific embodiments, and these embodiment just propose for the purpose of explaining and understand.

In the drawings:

Fig. 1 is the longitdinal cross-section diagram that is used for the electromagnetic switch of starter according to first embodiment of the invention;

Fig. 2 (a) is the longitdinal cross-section diagram of the movable contact that uses in the electromagnetic switch of Fig. 1;

Fig. 2 (b) is the front view of Fig. 2 (a);

Fig. 3 (a) is the longitdinal cross-section diagram of the insulating part that uses in the electromagnetic switch of Fig. 1;

Fig. 3 (b) is the front view of Fig. 3 (a);

Fig. 4 (a) is as the longitdinal cross-section diagram of Fig. 2 (a) to the assembly of movable contact shown in 3 (b) and insulating part;

Fig. 4 (b) is the front view of Fig. 4 (a);

Fig. 5 is the longitdinal cross-section diagram that is used for the electromagnetic switch of starter according to third embodiment of the invention;

Fig. 6 is the partial enlarged drawing of Fig. 5;

Fig. 7 is the longitdinal cross-section diagram that is used for the electromagnetic switch of starter according to fifth embodiment of the invention;

Fig. 8 is the local longitdinal cross-section diagram according to the electromagnetic switch of sixth embodiment of the invention;

Fig. 9 (a) is the front view of the Contact Cover used in the electromagnetic switch of Fig. 8;

Fig. 9 (b) is the longitdinal cross-section diagram of Fig. 9 (a);

Figure 10 is the front view of the sealing ring that uses in the electromagnetic switch of Fig. 8;

Figure 11 is the sectional view that the line A-A along Figure 10 intercepts;

Figure 12 is the longitdinal cross-section diagram that is used for the electromagnetic switch of starter according to seventh embodiment of the invention;

Figure 13 (a) is the front view of the movable contact that uses in the electromagnetic switch of Figure 12;

Figure 13 (b) is the longitdinal cross-section diagram of Figure 13 (a);

Figure 14 (a) is the front view of the terminal bolt installed in the electromagnetic switch of Figure 12;

Figure 14 (b) is the end view of Figure 14 (a); And

Figure 15 is the front view of the movable contact when near the terminal bolt in the electromagnetic switch of Figure 12.

Embodiment

With reference now to accompanying drawing,, especially with reference to figure 1, provide a kind of electromagnetic switch 1 according to first embodiment of the invention, this electromagnetic switch 1 is used to drive the starter of engine of for example start-uping a car, the identical identical part of Reference numeral indication in these several accompanying drawings.

This electromagnetic switch 1 comprises cup-shaped yoke 2, magnet exciting coil 4, plunger 6, plunger axis 7 and motor contact assembly (will describe in detail later on).These magnet exciting coil 4 rolls 3 twine, and are arranged on yoke 2 inside.Plunger 6 is arranged on bobbin 3 inside by axle sleeve 5.Plunger axis 7 is fixed on the plunger 6.The motor contact assembly is used to disconnect or the motor circuit (being motor driver) of closed starter.

Yoke 2 is made up of diapire 2a and cylindrical outer wall 2b.Diapire 2a has the circular central opening that forms within it.Outer wall 2b covers magnet exciting coil 4 from the circumferential extension of diapire 2a.Yoke 2 is also as the shell or the main body of electromagnetic switch 1, also and fixed core 8 form magnetic circuit together around magnet exciting coil 4.

Magnet exciting coil 4 is made up of pull-in winding 4a and hold-in winding 4b, and they twine with two-layer form roll 3.Pull-in winding 4a is used to generate the magnetic attraction of pulling plunger 6.Hold-in winding 4b is used to prevent that the plunger by pull-in winding 4a pulling from moving.

Axle sleeve 5 is for example made by the cylinder stainless steel, and extends in the circular open of yoke 2 diapire 2a from the inside of bobbin 3.

Plunger 6 is arranged on axle sleeve 5 inside, makes to slide at the axis direction of axle sleeve 5, contacts with the inwall of axle sleeve 5.Plunger 6 is by promoting on back-moving spring 9 direction left shown in the figure, thereby away from fixed core 8.Back-moving spring 9 is arranged between plunger 6 and the fixed core 8.

When magnet exciting coil 4 excitations are made that fixed core 8 is magnetized, will cause that by the magnetic attachment that generates by magnet exciting coil 4 plunger 6 moves on direction to the right as shown in the figure, thereby compress this back-moving spring 9.Alternatively, when these magnet exciting coil 4 losss of excitation, magnetic attachment disappears, because the spring pressure of this back-moving spring 9 will cause that plunger 6 returns left.In Fig. 1, the situation that switch 1 is in starting state or is in the close position is represented on the top more than the longitudinal centre line of switch 1.The following bottom of longitudinal centre line represents that switch is in the situation of dead status or open position.

One end of plunger axis 7 forms flange 7a, and welding plunger 6 makes plunger axis 7 and plunger 6 to rotate together on its end face.

The motor contact assembly comprise a pair of fixed contact 12 and with fixed contact 12 opposed movable contacts 13, this is connected motor circuit by two terminal bolts 10 with 11 to fixed contact 12.When needs closure motor contact assembly, movable contact 13 moves, and forms to be electrically connected between fixed contact 12.Alternatively, when needs disconnected the motor contact assembly, this movable contact 13 returned from fixed contact 12, to disconnect the connection between them.

Terminal bolt

10 and 11 is fixedly mounted in the resin Contact Cover 14.Fixed contact 12 is arranged on the inside of Contact Cover 14, and is separately fixed on the head of terminal bolt 10 and 11.As shown in Figure 1, by the openend of the yoke 2 that inwardly curls, Contact Cover 14 is connected with fixed core 8 by rubber encapsulation or liner 15.

Shown in Fig. 2 (a) and 2 (b), movable contact 13 by the rectangular metal plate of same thickness basically for example copper coin make.This movable contact 13 has diameter greater than the round center hole 13a of plunger axis 7 diameters and a pair of rectangular opening 13b that is in line arrangement, intersects with centre bore 13a along its longitudinal centre line.This movable contact 13 remains on the end of plunger axis 7 by insulating part 16, and is pushed by the contact compression spring 17 that is arranged between flange 7a and the insulating part 16, and near the retainer 18 on the end that is installed in plunger axis 7.Movable contact 13 has the contact area 13c that forms in the outside of rectangular opening 13b on its longitudinal direction, and the inwall by Contact Cover 14 remains in its external margin movable contact 13, prevent that it from rotating, thereby guarantee the stability when contact area 13c and fixed contact 12 are set up physics and contacted.

Shown in Fig. 3 (a) and 3 (b) were clear, insulating part 16 was made of the dish on the periphery that is installed in plunger axis 7 with round center hole 16a.This insulating part 16 also has the columned flange 16b that forms around centre bore 16a and is arranged in a pair of elliptical shaped lobes 16c of flange 16b outside in the radial direction at it.Shown in Fig. 3 (a), flange 16b and protruding 16c protrude from the same surface of insulating part 16, and shown in Fig. 4 (a) was clear, it highly was substantially equal to the thickness of movable contact 13.

Shown in Fig. 4 (a) and 4 (b), movable contact 13 and insulating part 16 are connected to each other.Specifically, the cylindric flange 16b of insulating part 16 is installed among the centre bore 13a of movable contact 13.Similar is that the protruding 16c of insulating part 16 also is installed among the rectangular opening 13b of movable contact 13.This prevents that insulating part 16 and movable contact 13 from relatively rotating with respect to each other.

When operation, when needs closed electromagnetic switch 1, magnet exciting coil 4 excitations are with magnetization fixed core 8.This will cause between fixed core 8 and plunger 6 and generate magnetic attachment that the spring pressure that makes plunger 6 face back-moving spring 9 moves towards fixed core 8 (being direction to the right shown in Figure 1).The contact area 13c of movable contact 13 is near fixed contact 12 then, thereby sets up electric connection between fixed contact 12.

When needs disconnect electromagnetic switch 1, magnet exciting coil 4 losss of excitation.This causes the disappearance of magnetic attachment, and the spring pressure by back-moving spring 9 moves movable contact 13, away from fixed contact 12, makes plunger 6 return its initial position (being open position).

As mentioned above, insulating part 16 is by the installation of the projection 16 in the rectangular opening 13b of movable contact 13, and the movable contact 13 that is permanently connected prevents that insulating part 16 from rotating with respect to movable contact 13.This has for example eliminated when vehicle rocks the relative fricting movement on the circumferencial direction of switch 1 between insulating part 16 and movable contact 13, makes the minimise wear of insulating part 16 thus.This has eliminated the needs of the friction surplus of insulating part 165, and allows insulating part 16 to reduce thickness, allows electromagnetic switch 1 to be reduced on its whole length thus.

Below the electromagnetic switch 1 according to second embodiment is described.

Form by resin molded with in this embodiment insulating part 16.As first embodiment, movable contact 13 is kept by the internal edge of Contact Cover 14, prevent that it from rotating, and allow it on the axial direction of plunger axis 7, to move, make movable contact 13 always clash into the same area (being the contact area 13c among Fig. 2 (b)) on the fixed contact 12.

When movable contact 13 being moved and when clashing into fixed contact 12, will cause by movable contact 13 to act on physical impact on the insulating part 16 by acting on magnetic attachment on the plunger 6.Because movable contact 13 always clashes into the same area on the fixed contact 12, and prevent that movable contact 13 from rotating with respect to insulating part 16, therefore always applies maximized impact load on the same part of insulating part 16.Specifically, when movable contact 13 bump fixed contacts 12, insulating part 16 bears this impact load at flange 16b with on it is positioned at the protruding 16c in the outside of flange 16b on radially.Shown in Fig. 3 (b), therefore maximum percussion is on the right part and left part of flange 16b.

Insulating part 16 by resin molded situation about forming under, importantly to design the position of the welding point W that usually in the molding process of insulating part 16, forms according to mechanical strength.Specifically, act at the impact load with maximum under the situation on the welding point W of the most weak insulating part of intensity 16, welding point W must have the intensity that is enough to bear this load, needs to increase the thickness of insulating part 16 thus., by form welding point W on the position outside the zone of peak load effect on the insulating part 16, this problem just can be eliminated.

Therefore, the insulating part 16 of second embodiment is designed to have the welding point W shown in Fig. 3 (b), and this welding point is formed on the right part and the position outside the left part of flange 16b of peak load effect.Preferably: the welding point W shown in Fig. 3 (b) forms and makes this welding point W occur on the occupied zone of the protruding 16c by any one of insulating part 16, and this any one protruding 16c bears minimum impact load.This makes insulating part 16 be reduced on thickness, can shorten the entire length of switch 1 thus.When last formation of protruding 16c therein, welding point W will have maximum thickness, cause its intensity to increase thus.This makes that insulating part 16 thickness is on the whole reduced.

Aforesaid movable contact 13 is a rectangular shape, as long as but movable contact 13 can be remained on the internal edge of Contact Cover 14, and can not rotate with respect to Contact Cover 14, movable contact 13 just can have arbitrary shape.For example, movable contact 13 can be round-shaped.This can prevent that it from also can obtain by keeping plunger 6 to prevent that it from rotating with respect to axle 7 rotations by keeping insulating part 16.The latter can make axle sleeve 5 keep plunger 6 within it by plunger 6 and axle sleeve 5 are all formed cross-sectional area for oval shape realizes, prevents its rotation.

Aforesaid insulating part 16 is formed from a resin, but can be selectively made by electrical insulating material such as cork, pottery and timber or the electric conducting material that is coated with dielectric film.

Fig. 5 represents the electromagnetic switch 1 according to third embodiment of the invention.The identical Reference numeral that uses in first to second embodiment is represented identical part, omits detailed description at this.

As first embodiment, electromagnetic switch 1 generally includes cup-shaped yoke 2, magnet exciting coil 4, plunger 6, plunger axis 7 and motor contact assembly.Magnet exciting coil 4 rolls 3 twine, and are arranged on yoke 2 inside.Plunger 6 is arranged on bobbin 3 inside by axle sleeve 5.Plunger axis 7 is fixed on the plunger 6.The motor contact assembly is used to disconnect or the motor circuit of closed starter.

Yoke 2 is also as the shell or the main body of electromagnetic switch 1, also and fixed core 8 form magnetic circuit together around magnet exciting coil 4.Fixed core 8 is made of the annular element with center flange, forms central opening in this center flange, and this center flange is installed in the opening of yoke 2, and magnet exciting coil 4 is remained between the diapire 2a of himself and yoke 2.Fixed core 8 its center flange are installed in the bobbin 3.

Plunger 6 is arranged on the inside of bobbin 3 by axle sleeve 5.Plunger 6 is made of the cylinder of hollow, and is formed with cylindrical cavity 6a within it, and this cylindrical cavity 6a opens wide on the end face opposite with fixed core 8, and drive link 110 inserts among this cylindrical cavity 6a.Drive link 110 is used for giving the gear lever (not shown) with the Motion Transmission of plunger 6, and has the end that extends to the outside of cylindrical cavity 6a and be formed with the ring-shaped groove 110a that gear lever is installed within it.This cylindrical cavity 6a also has the driving spring 111 that extends around drive link 110, and its end that promotes drive link 110 makes it stably near the diapire of cylindrical cavity 6a.

Terminal bolt

10 and 11 is fixedly mounted in the resin Contact Cover 14.Fixed contact 12 is arranged on Contact Cover 14 inside, and fixedlys connected with 11 with terminal bolt 10 respectively.Terminal bolt 10 is connected with battery in being installed in automobile by cable.Terminal bolt 11 is connected with the plus end brush (not shown) of starter motor by motor lead (not shown).

The plunger axis 7 of movable contact 13 by passing insulating part 16 and support plate 19 support, the spring pressure by contact pressure spring 17 promotes movable contact 13 and stably meshes with retainer 18 on the end that is installed in plunger axis 7.

Insulating part 16 constitutes by having the resin disk that forms round center hole within it, and plunger axis 7 passes this round center hole.As clearly shown in Figure 6, insulating part 16 has annular flange flange 16a, and this annular flange flange 16a protrudes on the thickness direction of insulating part 16, and extends around central opening.Movable contact 13 is installed on the outer rim of annular flange flange 16a.

Support plate 19 is installed on the plunger axis 7, near the opposite end face of movable contact 13 and insulating part 16, is used for movable contact 13 is remained on plunger axis 7 regularly together with insulating part 16.

Fig. 5 is illustrated in the electromagnetic switch 1 before installing on the assigned address in the car starter.Specifically, the spring pressure that is applied on the plunger 6 by back-moving spring 9 is absorbed near fixed core 8 by making insulating part 16.In other words, when the spring pressure by back-moving spring 9 made plunger 6 return away from fixed core 8, insulating part 16 was as the retainer of the home position (being the open position of switch 1) of restriction plunger 6.

As clearly shown in Figure 6, fixed core 8 has the partly last annular recess that forms of the heart therein.This recess comprises the annular bottom surface that has striking face 8a, and when plunger 6 entered home position, the end face of insulating part 16 clashed into this striking face 8a.Fixed core 8 also has the ladder that forms between the striking face 8a of the fixed core 8 relative with plunger 6 and end face 8b.As being seen on the thickness direction of fixed core 8, striking face 8a level height is lower than end face 8b.

As shown in Figure 6, insulating part 16 has the thickness t that does not comprise annular flange flange 16a, its thickness D greater than the ladder of fixed core 8 (that is the distance between striking face 8a and end face 8b).Therefore, when insulating part 16 clashes into the striking face 8a of fixed cores 8, between the end face 8b of movable contact 13 and fixed core 8, form gap X, avoid movable contact 13 directly to strike on the fixed core 8 thus.

Specifically, electromagnetic switch 1 also can be designed to when making plunger 6 turn back to fixed core 8 by back-moving spring 9, its end faces bump fixed cores 8 of insulating part 16 than the recessed darker striking face 8a of end face 8b.When insulating part 16 during near the striking face 8a of fixed core 8, insulating part 16 is overlapping with fixed core 8 on the ground, radially top of switch 1, that is, insulating part 16 partly enters in the fixed core 8.This structure allows insulating part 16 to be increased on thickness t, and does not need to increase the entire length of switch 1.The increase of insulating part 16 thickness t causes the increase of insulating part 16 mechanical strengths.

When insulating part 16 clashed into the striking face 8a of fixed cores 8, movable contact 13 made thus that away from the end face 8b of fixed core 8 movable contact 13 thickness are reduced.Specifically, do not need to allow movable contact 13 as the retainer that clashes into fixed core 8 when the open position (i.e. position left as shown in Figure 5) of plunger 6 Returning switch 1.This has eliminated and has allowed movable contact 13 have to be enough to the needs of mechanical strength of the return force that bears plunger 16, makes movable contact 13 be reduced on thickness and weight thus.

Electromagnetic switch 1 according to the 4th embodiment will be described below.

Electromagnetic switch 1 is designed so that the clearance C 2 between the inwall of the edge of clearance C 1 between plunger 6 and the lining 5 and exterior insulation spare 16 and fixed core 8 recesses satisfies the relation of C1＜C2.This prevents that insulating part 16 overlaps on the end face 8b of fixed core 8 stability when having guaranteed thus plunger 6 is returned away from fixed core 8 when plunger 6 moves or tilts on axle sleeve 5 inner radials.

Fig. 7 represents the electromagnetic switch 1 according to fifth embodiment of the invention.

This electromagnetic switch 1 is designed to fixed core 8 and insulating part 16 has respectively striking face 8a and the lateral surface 16b tapered with plunger 6.Specifically, the conical wall that is formed continuously by the end face 8b from fixed core 8 limits striking face 8a.The lateral surface 16b of insulating part 16 is arranged to be consistent with striking face 8a, makes that insulating part 16 is installed among the striking face 8a after insulating part 16 bump fixed cores 8, and as preventing the retainer that plunger axis 7 moves.As the 3rd embodiment, when the lateral surface 16b of insulating part 16 clashes into the striking face 8a of fixed core 8, between the end face 8b of movable contact 13 and fixed core 8, set up the gap, prevent that thus movable contact 13 from directly bumping against on the fixed core 8.

When plunger 6 returns away from fixed core 8 by the effect of back-moving spring 9, the lateral surface 16b of insulating part 16 is installed on the striking face 8a of fixed core 8, make insulating part 16 on the ground, radially top and fixed core 8 overlaids of switch 1, promptly insulating part 16 partly enters fixed core 8.This structure makes insulating part 16 be increased on thickness, and does not need to increase the entire length of switch 1.The increase of insulating part 16 thickness t causes the increase of insulating part 16 mechanical strengths.

Insulating part 16 enters place darker than end face 8b in the fixed core 8, causes plunger 6 to protrude a quantity that increases from yoke 2 thus, and this makes the installation of the switch 1 in the starter become easy.In addition, the engagement of the taper striking face 8a of the taper lateral surface 16b of insulating part 16 and fixed core 8 has improved the precision of centrally aligned plunger axis 7, has guaranteed the stability of assembled switch 1 in starter thus.This engagement also makes the inclination of insulating part 16 or deflection become and minimizes, thereby avoids applying undesirable bias force on insulating part 16, allows the mechanical strength of insulating part 16 to be selected to minimum thus.This allows insulating part 16 to be made by not expensive material.

When insulating part 16 bump fixed cores 8, movable contact 13 is away from the end face 8b of fixed core 8, eliminated allowing movable contact 13 have to be enough to the needs of mechanical strength of the return force that bears plunger 6 thus, made movable contact 13 on thickness and weight, be reduced thus.

Fig. 8 represents the electromagnetic switch 1 according to sixth embodiment of the invention.The identical Reference numeral of Shi Yonging is represented identical part in the above-described embodiments, omits detailed description at this.

The motor that electromagnetic switch 1 is designed to set up or block in the starter that is installed in automobile engine provides electric power, and the bar of driving pinion is moved.Except following these that will describe, electromagnetic switch 1 is structurally with to drive the starter electromagnetic switch identical with typical bar basically in the operation.

As above embodiment, Contact Cover 14 is made of resin, and is formed with contact cavities 40 within it, and movable contact 13 is provided with wherein, can switch 1 axially on move.By the openend of the yoke 2 that inwardly curls, Contact Cover 14 is connected with yoke 2 with sealing ring 100 via fixed core 120.

As above embodiment, yoke 2 is as switch main body, is used to form the magnetic circuit of being made up of yoke 2, fixed core 120, secondary fixed core 120a and the iron plunger (being the plunger 6 among Fig. 1) that is connected with plunger axis 7.

Plunger axis 7 passes fixed core 120 and extends in the contact cavities 40.Plunger axis 7 has the sleeve 180 that can be slidingly installed thereon.Movable contact 13 is installed on this sleeve 180, and upwards extends in the footpath of plunger axis 7.Directly promote movable contact 13 by contact pressure spring 17, make it face split circlip 30 (being also referred to as C clamp or snap ring) and pass packing ring 220.Split circlip 30 is installed in the ring-shaped groove that the end of plunger 7 forms, and keeps packing ring 220 to make it near sleeve 180.

Sealing ring 100 is installed in the rear open end of yoke 2.Contact Cover 14 also is installed in the rear open end of yoke 2, and is adjacent with sealing ring 100, and passes through the openend of inwardly curling yoke 2, and Contact Cover 14 is connected with yoke 2.Sealing ring 100 is made by rubber, and flexibly is clipped between the front end of the rear end of fixed core 120 and Contact Cover 14, to be sealed shut contact cavities 40.

The structure of Contact Cover 14 and sealing ring 100 is described in detail to Figure 11 with reference to Fig. 9 (a).Fig. 9 (a) is the front view of the front end of Contact Cover 14.Fig. 9 (b) is the longitudinal cross-section view of Fig. 9 (a).Figure 10 is the front view of sealing ring 100.Figure 11 is the sectional view that the line A-A along Figure 10 intercepts.

Shown in Fig. 9 (a) and 9 (b) were clear, Contact Cover 14 was formed with the recess that upwards extends and limit contact cavities 40 in the footpath of Contact Cover 14 on the core of front end 50.Contact Cover 14 also has pair of terminal hole 51 and 52, terminal hole 51 and 52 and contact cavities 40 intersect, and coil terminals passes terminal hole 51 and 52, provides electric power for magnet exciting coil 4 (see figure 1)s with seven projectioies 53 to 59 altogether of fixed core 120 adjacent settings.Terminal hole 51 and 52 is made of the slit, rectangular wall that each slit is shunk by taper and oval recess around.The front end 50 of Contact Cover 14 has annular outer rim 60 and 61 and inner face 58.Outward flange 61 is the planar annulars that limit the circumference of front end 50.Shown in Fig. 9 (b), outward flange 60 is annular flange flange of the triangular cross section that protrudes from outward flange 61 on the axis direction of Contact Cover 14.Promote annular outer rim 60 and 61, make it stably adjacent on the axis direction of switch 1 with sealing ring 100.Inner face 62 is faced sealing ring 100, and presses junk ring 100 on the axis direction of switch 1 hardly.Inner face 62 occupies the part that front end 50 is positioned at ring edge 60 inside, and extends around terminal hole 51 and 52 and protruding 53 to 59.

Sealing ring 100 is made up of the outside heavy wall 101 and the inner thin-walled 102 of annular.The heavy wall 101 of annular be clipped in Contact Cover 14 annular

outer rim

60 and 61 and the rear end face of fixed core 120 between.Inner thin-walled 102 is extended in the inside of annular heavy wall 101, and is clipped between the rear end face of the inner face 62 of Contact Cover 14 and fixed core 120.As clearly shown in Figure 11, inner thin-walled 102 is recessed from the end of annular heavy wall 101.

Specifically, when Contact Cover 14 was connected with yoke 2, the annular

outer rim

60 and 61 of Contact Cover 14 was used for the annular, outer heavy wall 101 of compression seal ring 100, the sealing that is hedged off from the outer world with formation.The inner face 62 of Contact Cover 14 is arranged to the inner thin-walled 102 of sealing ring 100 adjacent, and need not seal contact cavities 40 and

terminal hole

51 and 52 by the annular, outer heavy wall 101 of compression seal ring 100 with being hedged off from the outer world.

As shown in figure 10, inner thin-walled 102 mainly is made up of two parts: as shown in the drawing upper and lower

arch section

102a and 102b, each part is connected between two regional 101a and 101b that extend internally of annular, outer heavy wall 101, is used for the

terminal hole

51 and 52 around Contact

Cover 14.Zone

101a and 101b are formed with oval-shaped window 107, when Contact Cover 14 was connected in sealing ring 100, this window 107 made power lead extend through window 107 from

terminal hole

51 and 52 in the face of

terminal hole

51 and 52, and be connected with magnet exciting coil 4, as shown in Figure 1.Sealing ring 100 also has location hole 103,104,105 and 106, and the projection 53 to 56 of Contact Cover 14 is passed location hole 103,104,105 and 106, and is adjacent with the rear end surface of fixed core 120.

When Contact Cover 14 was connected with yoke 2, four projectioies 53 to 56 of Contact Cover 14 were installed in the location hole 103 to 106 with the adjacent sealing ring 100 of the rear end surface of fixed core 120.Projection 57 to 59 is installed in the contact cavities window 108, contacts with inner edges, is used for movable contact 13 is positioned at Contact Cover 14.Limit or around location hole 103 to 106 by annular, outer heavy wall 101 and inner thin-walled 102.

In the operation of electromagnetic switch 1, when the ignition switch (not shown) conducting of automobile is carried out excitation to as shown in Figure 1 magnet exciting coil 4, to cause that plunger 6 is attracted, and promote plunger axis 7 overcomes back-moving spring 9 together with movable contact 13 spring pressure and move to switch closed position from as shown in Figure 8 switch open position.When arriving switch closed position, movable contact 13 bumps are fixed on the fixed contact 12 on terminal bolt 10 and 11.The spring pressure that plunger 6 further faces back-moving spring 9 is attracted, and up to adjacent with the front end surface of secondary fixed core 120a, stops then.Contact pressure spring 17 is used for applying the spring pressure of guaranteeing near fixed contact 12 to movable contact 13, provides electric power from battery to starter motor thus.When magnet exciting coil 4 losss of excitation caused that magnetic attachment disappears after the engine start, back-moving spring 9 made plunger 6 return towards the open position of switch 1, and mobile movable contact 13 makes it away from fixed contact 12.

When Contact Cover 14 was connected with yoke 2, the inner thin-walled 102 of sealing ring 100 was arranged between the rear end surface of the inner face 62 of Contact Cover 14 and fixed core 120.Inner thin-walled 102 is littler than the thickness of outside heavy wall 101, makes when making Contact Cover 14 connection yokes 2, and its thickness is compressed into the degree littler than outside heavy wall 101.This makes openend when the yoke 2 that curls face the surging reduction that fixed core 120 is pushed Contact Cover 14 when forming firm connection of Contact Cover 14 and yoke 2, and need not sacrifice the sealability of sealing ring 100.Inner thin-walled 102 makes undesirable minimizing deformation of sealing ring 100 when being installed in sealing ring 100 in the yoke 2 thus, thereby makes its installation become easy by constituting with case chip that the regional 101a of extending internally of annular, outer heavy wall 101 is connected with 101b.

As mentioned above, inner thin-walled 102 is made of the part 102a and the 102b of bending, and crooked part 102a is connected with 101b with the regional 101a of extending internally of annular, outer heavy wall 101 with 102b, causes improving the minimizing of sealing ring 100 total amount of material of above-mentioned effect thus.

Part

102a and 102b curve inwardly, and extend together with regional 101a of extending internally of annular, outer

heavy wall

101 and 101b along the whole circumference of sealing ring 100, have improved the distortion resistance of sealing ring 100 thus.

As mentioned above, when the openend with yoke 2 is curled into when making Contact Cover 14 and yoke 2 form firm the connection, to face fixed core 120 and push the required pressure of Contact Cover 14 in order to reduce, the thickness that sealing ring 100 is designed so that inner thin-walled 102 is reduced, front end 50 removes near the annular, outer heavy wall 101 of sealing ring 100 and the zone the projection 53 to 56 to be that inner face 62 can selectively be recessed into, to make its thickness minimizing equal the value of the difference of annular, outer heavy wall 101 and inner thin-walled 102 thickness.This structure also satisfies above-mentioned advantage.

Figure 12 represents the electromagnetic switch 1 according to seventh embodiment of the invention.The identical Reference numeral of Shi Yonging is represented identical part in the above-described embodiments, omits detailed description at this.

As the 3rd embodiment, plunger 6 its interior cylindrical cavity 6a that form, driving spring 111 extends around driven rod 110 in this cylindrical cavity 6a.Driving spring 111 one ends lean against on the flange of installing in the openend of plunger 6 170, and its other end leans against on the base flange of driven rod 110, and the base flange that promotes driven rod 110 makes it stably near the diapire of cylindrical cavity 6a.

Shown in Figure 13 (a) and 13 (b), movable contact 13 is made of the rectangular conductive plate, and this conductive plate heart therein partly is formed with opening 135, and plunger axis 7 inserts in this opening 135.As shown in figure 12, in movable contact 13 location and the Contact Cover 14, make it have vertically extending length among the figure.Movable contact 13 has the contact areas 130 that 135 outsides limit in the hole on its longitudinal direction.Each contact area 130 is the rectangles with width W and height H.

Terminal bolt

10 and 11 is installed in the hole that the bottom of resin Contact Cover 14 forms, and by

nut

160 and 170 fixing maintenances.

Terminal bolt

10 and 11 has the

head

161 and 171 that exposes contact cavities 40.As shown in figure 12,

head

161 and 171 and the longitudinal centre line C (being switch 1) of plunger axis 7 vertically arrange equidistantly.

Head

161 and 171 has the

projection

162 and 172 as fixed contact on its top.Fixed contact 162 is than the more close plunger axis 7 of the longitudinal centre line of terminal bolt 10.Similarly, fixed contact 172 is than the more close plunger axis 7 of the longitudinal centre line of terminal bolt 11.Specifically, shown in Figure 14 (a) and 14 (b), the axis F of fixed contact 172 (being the center) shifts into the more close plunger axis 7 than the longitudinal centre line E of terminal bolt 11.Preferably, the whole fixed contact 172 of terminal bolt 11 is offset (being the upper part Figure 12) from the longitudinal centre line E of terminal bolt 11 to plunger axis 7.Similarly, the axis of fixed contact 162 (being the center) shifts into than the more close plunger axis 7 of the longitudinal centre line of terminal bolt 10.Preferably, the whole fixed contact 162 of terminal bolt 10 is from longitudinal center's alignment plunger axis 7 skews (being the lower part Figure 12) of terminal bolt 10.

Shown in Figure 12,14 (a) and 14 (b) were clear, the head of terminal bolt 11 171 was formed with rectangular recess 173 in it, and it is more farther apart from the longitudinal centre line C of plunger axis 7 than fixed contact 172.Similarly, as clearly shown in Figure 12, the head 161 of terminal bolt 10 is formed with rectangular recess 163 within it, and it is more farther apart from the longitudinal centre line C of plunger axis 7 than fixed contact 162.Shown in Figure 14 (a) and 14 (b), each fixed contact 162 and 172 all is the rectangle with width w, height h and thickness t.Height h is slightly less than the height H of movable contact 13.Width w is slightly less than the width W of movable contact 13.This has guaranteed contacting of fixed contact 162 and 172 whole surface (being 174 among Figure 14 (b)) and movable contact 13.As shown in figure 12, when movable contact 13 is positioned near fixed contact 162 and 172, each fixed contact 162 and 172 thickness t may be selected to than the big set-point of interval V (that is contact pressure spring 17 available after-expansion amounts) between the rear end surface of the front end surface of packing ring 220 and sleeve 180.This has guaranteed the contact area 130 of movable contact 13 and the physical abutment of fixed contact 162 and 172 within the maximum possible weight ranges of fixed contact 162 and 172 wearing and tearing, and these fixed contacts 162 and 172 do not have the head except that fixed contact 162 and 172 161 shown in Figure 14 (a) and the impingement region 185 of 171 end surfaces.

The structure of electromagnetic switch 1 provides following advantage.

Terminal bolt

10 and 11 has to the projection of the axis bias of the plunger axis 7 that is connected with plunger 6 or fixed

contact

162 and 172, the length that allows movable contact 13 thus (promptly, vertical range between the end of movable contact 13 as shown in figure 12) reduced, and reduce under the situation at the interval between

terminal bolt

10 and 11 not needing, guaranteed fixed

contact

162 and 172 whole surface contacting shown in the dash area of Figure 15 with movable contact 13.This has been avoided being installed in the direct

bump terminal bolts

10 and 11 of packing ring 220 on the end of axle 2.

The terminal bolt 10 that forms contact each other and 11 fixed contact 162 become rectangle with 172 the surface and the surface design of movable contact 13, under the situation of not sacrificing the contact area between movable contact 13 and fixed

contact

162 and 172, the length of movable contact 13 is reduced thus.The minimizing of movable contact 13 length causes the minimizing of eccentric load on the movable contact 13, this makes the concentrated wear on surface of

fixed contact

162 and 172 minimize, wherein eccentric load be when since the effect between movable contact 13 and the plunger axis 7 produce when causing movable contact 13 to tilt.With the

head

161 and 171 of

terminal bolt

10 and 11 on fixed contact 162 and the minimizing of the formation of 172 adjacent recesses 163 and the 173 lip-deep condensation that causes when ambient temperature reduces, adhering to fixed

contact

162 and 172 or freezing amount of

moisture.Recess

163 and 173 can be formed with the unsmooth surface that has increased area, is perhaps selectively replaced by the irregular surface that is formed on

head

161 and 171.

Terminal bolt

10 and 11 main body, fixed

contact

162 and 172 and

head

161 and 171 by making with a kind of electric conducting material,, the part (comprise head 161 and 171) of

terminal bolt

10 and 11 except that fixed

contact

162 and 172 can be made by low material by the thermal conductivity of thermal conductivity ratio fixed contact 162 and 172.This temperature decrease speed that causes terminal bolt 10 and 11 (comprising head 161 and 171) is littler than the temperature decrease speed of fixed contact 162 and 172.Therefore, when external temperature descends, for example be drawn to terminal bolt 10 and will reduce, cause adhering to the minimizing of

fixed contact

162 and 172 lip-deep condensations or freezing amount of moisture thus with heat the cable that 11 are connected from

fixed contact

162 and 172.

Although in order to understand the present invention better, the present invention is done to describe, it must be understood that the present invention can be embodied by different way under the situation that does not break away from the principle of the invention according to preferred embodiment.Therefore, the present invention it must be understood that the distortion that becomes to comprise the embodiment that all possible embodiment or these have shown, and under the situation that does not break away from the subsidiary principle of the invention that claims proposed, these embodiment and distortion can be embodied.

Claims

1. electromagnetic switch that is used for starter comprises:

Be used to form the iron core of part magnetic circuit;

Be arranged in the plunger that bears magnetic attachment on the first direction towards described iron core;

The a pair of fixed contact that is connected with the motor circuit of starter;

Be fixed to the axle of described plunger;

Be installed in the movable contact on the end of described axle by insulating part, along with described plunger is carried out sucking action, make described movable contact on first direction, overcome the spring pressure that generates by described spring and move, thereby when switch closed position, between described fixed contact, set up electric connection;

Be arranged on the spring between described iron core and the described plunger, it is created on and promotes the spring pressure of described plunger away from described iron core on the second direction opposite with first direction, thereby makes described plunger be in the switch open position; And

The recess that on the end face of the described iron core relative, forms with described plunger, bottom at this recess has striking face, when the spring pressure of described spring makes described plunger when switch closed position turns back to the switch open position, this striking face is clashed in the end of insulating part.

2. electromagnetic switch as claimed in claim 1, wherein said recess has a degree of depth, and this degree of depth is the distance between striking face and the described end face of iron core, and this degree of depth is less than the thickness of described insulating part.

3. electromagnetic switch as claimed in claim 1, wherein said plunger is arranged in the yoke, between the inwall of the periphery of described plunger and yoke, has first gap, described insulating part is arranged in the described recess, between the interior week of the periphery of described insulating part and described recess, have second gap, and this second gap is greater than this first gap.

4. electromagnetic switch that is used for starter comprises:

Be used to form the iron core of part magnetic circuit;

Be fixed to the axle of described plunger;

Be arranged on the spring between described iron core and the described plunger, it is created on and promotes the spring pressure of described plunger away from described iron core on the second direction opposite with first direction, thereby makes described plunger be in the switch open position;

The recess that forms on the end face of the described iron core relative with described plunger forms striking face on the inner surface of described recess, striking face shrinks from this end face taper; And

The retainer face that the taper that forms on described insulating part is shunk, it is installed on the striking face of described recess, when the spring pressure by described spring makes described plunger when switch closed position turns back to the switch open position, it is used to stop the motion of described plunger.

5. electromagnetic switch as claimed in claim 4 wherein when the retainer face is arranged near this striking face, is set up the gap between described iron core and described movable contact.

6. electromagnetic switch that is used for starter comprises:

The cylinder switch main body of hollow is provided with within it at the upwardly extending iron core in described switch main body footpath, and this iron core forms the part magnetic circuit;

The Contact Cover that is connected with the end of described switch main body in its end, described Contact Cover is limited with a chamber within it, in this chamber, be provided with movable contact, this movable contact by described switch main body by magnetic attachment move, make it near fixed contact or away from fixed contact; And

Be arranged on the sealing ring between described Contact Cover end and the end face of iron core,

The end of wherein said Contact Cover is formed with annular, outer face and internal end surface, this annular, outer face extends outside the chamber, and faces the thickness of the described sealing ring of external compression of the end face of described iron core, and this inner face extends to this annular, outer face is inner, do not compress the thickness of described sealing ring, and

Wherein said sealing ring comprises annular, outer heavy wall pipe inner thin-walled, this annular, outer heavy wall is arranged in the clip that is formed by the annular, outer face of described Contact Cover and end face unshakable in one's determination, and this inner thin-walled is towards the inside extension of the annular, outer heavy wall between the internal end surface of described Contact Cover and end face unshakable in one's determination.

7. electromagnetic switch as claimed in claim 6, the outside heavy wall of wherein said sealing ring comprises annular, outer part and a plurality of interior sections that partly extend internally from this annular, outer, and this inner thin-walled is made up of a plurality of parts that are connected with the interior section of described outside heavy wall.

8. electromagnetic switch as claimed in claim 7, wherein the interior section of this inner thin-walled and described annular, outer heavy wall defines the window in the face of the chamber of described Contact Cover together.

9. electromagnetic switch as claimed in claim 6, the inner thin-walled of wherein said sealing ring has facing surfaces, and this surface is recessed from the annular, outer heavy wall.

10. electromagnetic switch as claimed in claim 6, wherein said sealing ring is formed with terminal hole and location hole, lead passes terminal hole and extends, for the magnet exciting coil that is provided with in the switch main body provides electric power, make the end sections of described Contact Cover be arranged to end face by location hole, and the annular, outer heavy wall extend into around terminal hole and location hole near iron core.

11. an electromagnetic switch that is used for starter comprises:

The Contact Cover that connects the end of described switch main body in its end, described Contact Cover is limited with a chamber within it, in this chamber, be provided with movable contact, this movable contact by described switch main body by magnetic attachment move, make it near fixed contact or away from fixed contact; And

The end of wherein said Contact Cover is formed with annular, outer face and internal end surface, this annular, outer face extends outside the chamber, and face the thickness of the described sealing ring of external compression of the end face of described iron core, this internal end surface is to the inner extension of annular, outer face, do not compress the thickness of described sealing ring, and recessed from the annular, outer face, and

Described sealing environment protecting be held between the annular, outer face of described Contact Cover and the unshakable in one's determination end face and the internal end surface of described Contact Cover and end face unshakable in one's determination between.

12. an electromagnetic switch that is used for starter comprises:

Switch main body;

With the Contact Cover that described switch main body is connected, described Contact Cover has contact cavities within it;

Be arranged on the plunger axis in the described switch main body, it has the end of the contact cavities that is exposed to described Contact Cover, but described plunger axis moves to the quilt magnetic attachment on its axis direction;

Remain on the movable contact on the end of described plunger axis, described movable contact upwards extends in the footpath of described plunger axis;

The first and second fixed contact rod members, it extends through described Contact Cover on the axis direction of described plunger axis, have first and second heads that expose in the contact cavities inside of described Contact Cover, this first and second head has first and second fixed contacts in the face of described movable contact surface, when making described movable contact surface near first and second fixed contacts, between first and second fixed contacts, form and electrically contact by described plunger axis mobile; And

First and second projectioies that form on first and second heads of the described first and second fixed contact rod members limit first and second fixed contacts respectively.

13. electromagnetic switch as claimed in claim 12, first and second heads of the wherein said first and second fixed contact rod members separate each other one at interval, it allows the part of described plunger axis to extend towards the described first and second fixed contact rod members from described movable contact, enter between first and second fixed contacts, but contact without any physics.

14. electromagnetic switch as claimed in claim 12, first and second heads of the wherein said first and second fixed contact rod members with and the align dummy line of extending of the longitudinal centre line of described plunger axis intersect and arrange, and the center of first and second contacts is nearer than the described dummy line of the centre distance of first and second heads.

15. electromagnetic switch as claimed in claim 14, wherein first and second contacts are nearer apart from described dummy line on perpendicular to the direction of described dummy line than the longitudinal centre line of described first and second fixed contact rod member main bodys except that first and second heads.

16. electromagnetic switch as claimed in claim 13, between the longitudinal centre line of wherein said plunger axis and the outermost end of described movable contact the ultimate range that described plunger axis directly makes progress be substantially equal to or greater than described dummy line and described first and second fixed contacts in the ultimate range that makes progress in the footpath of described plunger axis between the outermost end of at least one fixed contact.

17. electromagnetic switch as claimed in claim 13, wherein abut one another the rectangular shape of zone for limiting by first opposite side and second opposite side with the regional and described movable contact that between first and second fixed contacts, forms first and second fixed contacts that electrically contact, this first opposite side parallels extension with the straight line that directly upwards passes the first and second fixed contact rod members at described plunger axis basically, and this second opposite side is substantially perpendicular to this first opposite side and extends.

18. electromagnetic switch as claimed in claim 12, wherein because the wearing and tearing of first and second fixed contacts, each described first and second projection the original depth of described plunger axis on axially than allow described movable contact described plunger axially on big from described movable contact near the distance that the initial position of described first and second fixed contacts begins to advance.

19. electromagnetic switch as claimed in claim 12, wherein the zone of each first and second head of the described first and second fixed contact rod members except that the zone of a corresponding projection that forms first and second projectioies thereon has rough surface.

20. electromagnetic switch as claimed in claim 12, wherein the thermal conductivity of described first and second projectioies of the thermal conductivity ratio of the main body of each described first and second fixed contact rod member is low.