GB2082393A - Electromagnetic switch, for use with electrical starters of internal combustion engines - Google Patents
Electromagnetic switch, for use with electrical starters of internal combustion engines Download PDFInfo
- Publication number
- GB2082393A GB2082393A GB8124727A GB8124727A GB2082393A GB 2082393 A GB2082393 A GB 2082393A GB 8124727 A GB8124727 A GB 8124727A GB 8124727 A GB8124727 A GB 8124727A GB 2082393 A GB2082393 A GB 2082393A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic core
- tie rod
- magnetic
- internal combustion
- extends
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
- H01H51/02—Non-polarised relays
- H01H51/04—Non-polarised relays with single armature; with single set of ganged armatures
- H01H51/06—Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity
- H01H51/065—Relays having a pair of normally open contacts rigidly fixed to a magnetic core movable along the axis of a solenoid, e.g. relays for starting automobiles
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electromagnets (AREA)
- Valve Device For Special Equipments (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
An electromagnetic switch for electrical starters of internal combustion engines, which advances and engages a starting pinion into the toothed rim of the internal combustion engine, has a magnetic armature (15) which can be pulled into an excitation winding (13) towards a magnetic core (9). A switching bridge (22) and a tie rod (18) are secured to the magnetic armature (15). In order to hold the switching bridge (22) in its switching plane, the tie rod (18) which is made of plastics material is provided with a profiled guide portion (20) which extends into a corresponding recess (17) in the magnetic armature (15) and extends through a similarly profiled aperture (23) in the magnetic core (9), whereby a straight guide, which is simple to manufacture, is provided for the magnetic armature (15). <IMAGE>
Description
SPECIFICATION
Electromagnetic switch for use with electrical starters of internal combustion engines
The present invention relates to an electromagnetic switch for use with electrical starters of internal combustion engines.
In particular, the present invention relates to an electromagnetic switch having a magnetic armature which can be pulled into an excitation winding towards a magnetic core, and to which is secured a switching bridge and a tie rod which extends through the magnetic core. In a switch of this kind, it is known for the tie rod to be of cylindrical construction and to secure the magnet armature, connected to the tie rod, against rotation by a straight guide secured to the yoke in order to keep the switching bridge, secured to the magnet armature, in its switching plane. It is disadvantageous that it is complicated and thus expensive to manufacture the additional straight guide. Moreover, the risk of fracture as a result of vibratory stress in rough operation in motor vehicles can readily cause the total failure of the starter.
An aim of the present invention is to provide a better and cheaper switch for use with engine starters.
According to the present invention there is provided an electromagnetic switch for electrical starters of internal combustion engines, comprising a magnetic armature which can be pulled into an excitation winding, towards a magnetic core, and to which is secured a switching bridge and a tie rod which extends through the magnetic core, the tie rod being made from a plastics material and having a guide portion which has a profiled transverse cross-section which extends through a guide of complementary construction, in the magnetic core.
An electromagnetic switch constructed according to the present invention, has the advantage that an additional, expensive straight guide for the magnetic armature, which guide is known to be susceptible to fracture is no longer required by virtue of the tie rod and magnetic core of the present invention, effecting a straight guide for the magnetic armature. A further advantage is that more magnetic material can be provided in the core, by virtue of the profiled crosssection of the tie rod in the magnetic core, thereby increasing the pull-in force.
In a preferred embodiment of the present invention the magnetic core has a shaped portion which is rotationally fixed in an aperture in a base plate carrying a yoke which engages over the excitation winding. Further, the tie rod extends into a longitudinal bore in the magnetic armature and is rigidly connected to the switching bridge, a widened end portion of the bore, facing the magnetic core, having a cross-section corresponding to that of the profiled guide portion. Preferably the profiled guide portion of the rod has a sub sta ntially cruciform transverse cross-section.
The present invention will now be further described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a longitudinal sectional view through one embodiment of an electromagnetic switch constructed according to the present invention; and
Figure 2 is a fragmentary section through the switch, taken along the line ll-ll of Fig. 1.
In the accompanying drawings an electromagnetic switch of a starter for internal combustion engines is shown, which has a pull-in magnet having a U-shaped yoke 1 whose base has an axially outwardly extending guide extension 4 within which a cylindrical member 10 defining an opening 3, is located. A base plate 6 is secured to the edges 5 of the yoke 1 which are bent in a flange-like manner. An elongated aperture 7 in alignment with the opening 3 in the base 2 of the yoke, is formed in the base plate 6. The elongate hole 7 has two mutually oppositely located parallel sides which are interconnected by arcuate regions. A magnetic core 9 is mounted on that side of the base plate 6 which faces the base 2 of the yoke and has an extension 8 which extends through the aperture 7.The magnetic core 9 is secured to that side of the base plate 7 which is remote from the base 2 of the yoke by peening or crimping back to the edge of the extension 8.
The cylindrical member 10 is made from brass and forms a guide sleeve which carries a two-part winding carrier 11 on the inner portion of which is disposed a holding winding 12 and on the outer portion of which is disposed a pull-in winding 1 3. The winding carrier 11 is pressed against the base plate 6 in a vibration-free manner by a spring 14 interposed between the end face of the winding carrier and the base 2 of the yoke.
A magnetic armature 1 5 is longitudinally movably accommodated in the guide sleeve 10. When in its normal position, the magnetic armature has a long guide- and support portion by virtue of the guide sleeve 10 extending into the guide extension 4 on the base 2 of the yoke. The magnetic armature 1 5 has a longitudinal bore 1 6 whose widened end portion 1 7 nearest to the magnetic core 9, has a substantially cruciform cross section.A tie rod 1 8 of a plastics material, has a fastening portion 1 9 which extends through the longitudinal bore 1 6. A guide portion 20 of the tie rod, is contiguous with the fastening portion 1 9 and has the substantially cruciform cross section of the widened end portion 1 7 of armature 1 5. The tie rod 1 8 is secured to the magnetic armature 1 5 by means of a screw 21. Furthermore, a switching bridge 22 is secured to the magnetic armature 1 5 by means of the screw 21. The switching bridge
22 abuts against the outer end face of the
magnetic armature 15.The screw 21 is inserted through the switching bridge 22 and is screwed into the fastening portion 1 9 of the tie rod 18 in bore 1 6. The magnetic armature 1 5 is secured to the tie rod 18 so as to be non-rotatable relative thereto, this being effected by virtue of the fact that one end of the guide portion 20 is received in the widened end portion 1 7 of the magnetic armature 1 5.
The guide portion 20 of the tie rod 18 extends through an aperture 23, also having a cruciform cross section, in the magnetic core
9. The end of the tie rod 18 extending out of the magnetic core 9 is in the form of a switching head 24. It has a larger diameter than the guide portion and has a cylindrical configuration. When in its normal position illustrated in Fig. 1, the switching head 24 abuts externally against the magnetic core 9.
A resiliently disposed ball 25 is fitted in the switching head 24, and, in a known manner (not further illustrated), presses against a shaft of the engaging gear of the starting pinion by which the ball advances the starting pinion when the magnetic armature 1 5 is pulled-in.
By virtue of the plastics tie rod 18 guided in the metal magnetic core 9, friction is kept to a favourable level. Further, this construction is resistant to wear, and is silent, and is not susceptible to jamming or even seizing, since grease which tends to form a paste, is no longer required as a lubricant between the tie rod 18 and the magnetic core 9. Moreover, a larger quantity of magnetic material is available by virtue of the profiled guide 23 in the magnetic core 9, thus increasing the pullin force of the switch.
Alternatively, the profiled guide portion 20 and the associated recesses 1 7 and 23 can have a star-shaped cross section or a cross section of similar profile, by which a straight guide for the tie rod 1 8 and thus for the magnetic armature 1 5 is obtained when the magnetic core 9 is pulled-in.
Claims (5)
1. An electromagnetic switch for electrical starters of internal combustion engines, comprising a magnetic armature which can be pulled into an excitation winding, towards a magnetic core, and to which is secured a switching bridge and a tie rod which extends through the magnetic core, the tie rod being made from a plastics material and having a guide portion which has a profiled transverse cross-section which extends through a guide of complementary construction, in the magnetic core.
2. A switch as claimed in claim 1, in which the magnetic core has a shaped portion which is rotationally fixed in an aperture in a base plate carrying a yoke which engages over the excitation winding.
3. A switch as claimed in claim 1 or 2, in which the tie rod extends into a longitudinal bore in the magnetic armature and is rigidly connected to the switching bridge, a widened end portion of the bore, facing the magnetic core, having a cross section corresponding to the profiled guide portion.
.
4. A switch as claimed in any one of claims 1 to 3, in which the profiled guide portion has a substantially cruciform transverse cross section.
5. An electromagnetic switch for electrical starters of internal combustion engines, constructed substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803030776 DE3030776A1 (en) | 1980-08-14 | 1980-08-14 | ELECTROMAGNETIC SWITCHES, IN PARTICULAR FOR ELECTRICAL TURNING DEVICES OF INTERNAL COMBUSTION ENGINES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2082393A true GB2082393A (en) | 1982-03-03 |
Family
ID=6109629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8124727A Withdrawn GB2082393A (en) | 1980-08-14 | 1981-08-13 | Electromagnetic switch, for use with electrical starters of internal combustion engines |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3030776A1 (en) |
| FR (1) | FR2488657A1 (en) |
| GB (1) | GB2082393A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992022082A1 (en) * | 1991-05-27 | 1992-12-10 | Robert Bosch Gmbh | Solenoid switch for the starter of an internal combustion engine |
| EP0581277A2 (en) * | 1992-07-31 | 1994-02-02 | Nippondenso Co., Ltd. | Magnet switch |
| CN102913361A (en) * | 2011-08-05 | 2013-02-06 | 罗伯特·博世有限公司 | Starter and starter relay with anti-rotation and method for manufacturing same |
-
1980
- 1980-08-14 DE DE19803030776 patent/DE3030776A1/en not_active Withdrawn
-
1981
- 1981-05-26 FR FR8110491A patent/FR2488657A1/en not_active Withdrawn
- 1981-08-13 GB GB8124727A patent/GB2082393A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992022082A1 (en) * | 1991-05-27 | 1992-12-10 | Robert Bosch Gmbh | Solenoid switch for the starter of an internal combustion engine |
| AU653596B2 (en) * | 1991-05-27 | 1994-10-06 | Robert Bosch Gmbh | Solenoid switch for the starter of an internal combustion engine |
| EP0581277A2 (en) * | 1992-07-31 | 1994-02-02 | Nippondenso Co., Ltd. | Magnet switch |
| EP0581277A3 (en) * | 1992-07-31 | 1994-07-27 | Nippon Denso Co | Magnet switch |
| US5428330A (en) * | 1992-07-31 | 1995-06-27 | Nippondenso Co., Ltd. | Magnet switch |
| CN102913361A (en) * | 2011-08-05 | 2013-02-06 | 罗伯特·博世有限公司 | Starter and starter relay with anti-rotation and method for manufacturing same |
| DE102011080477A1 (en) * | 2011-08-05 | 2013-02-07 | Robert Bosch Gmbh | Starter relay for starting device, particularly for starter for starting internal combustion engine, has motion capture formed on contact device or magnet core by rotation of magnetic core or axial movement of component of contact device |
| CN102913361B (en) * | 2011-08-05 | 2016-06-08 | 罗伯特·博世有限公司 | Starting engine and with rotating the starting relay in stop portion and its manufacture method |
| DE102011080477B4 (en) | 2011-08-05 | 2021-09-02 | Seg Automotive Germany Gmbh | Starter and starter relay with anti-twist protection |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2488657A1 (en) | 1982-02-19 |
| DE3030776A1 (en) | 1982-03-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |