EP2774161A1 - Solenoid switch and starter motor comprising the same - Google Patents

Solenoid switch and starter motor comprising the same

Info

Publication number
EP2774161A1
EP2774161A1 EP12845259.6A EP12845259A EP2774161A1 EP 2774161 A1 EP2774161 A1 EP 2774161A1 EP 12845259 A EP12845259 A EP 12845259A EP 2774161 A1 EP2774161 A1 EP 2774161A1
Authority
EP
European Patent Office
Prior art keywords
engaging means
starter motor
plunger
solenoid switch
pushing rod
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Withdrawn
Application number
EP12845259.6A
Other languages
German (de)
French (fr)
Other versions
EP2774161A4 (en
Inventor
Jiming Chen
Javier Bores
Simon Rentschler
Guojun Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Automotive Products Changsha Co Ltd
Robert Bosch GmbH
Original Assignee
Bosch Automotive Products Changsha Co Ltd
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bosch Automotive Products Changsha Co Ltd, Robert Bosch GmbH filed Critical Bosch Automotive Products Changsha Co Ltd
Publication of EP2774161A1 publication Critical patent/EP2774161A1/en
Publication of EP2774161A4 publication Critical patent/EP2774161A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
    • F02N15/06—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement
    • F02N15/067—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement the starter comprising an electro-magnetically actuated lever
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/087—Details of the switching means in starting circuits, e.g. relays or electronic switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
    • H01H50/641—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rectilinear movement
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil

Definitions

  • the present invention relates to a solenoid switch for completing a main circuit of a starter motor and for moving a drive pinion of the starter motor outwards to engage in a ring gear on an engine flywheel.
  • the present invention also relates to a starter motor comprising such a solenoid switch.
  • An engine of a motor vehicle is normally started by an electric starter motor.
  • the starter motor drives the engine of the motor vehicle to operate at a high speed until the engine can operate independently and generate its own power output.
  • the starter motor consists of a direct current (DC) motor, a transmission mechanism and a control mechanism.
  • the DC motor obtains its electrical power supply from a battery and generates a rotary torque.
  • an ignition switch is switched on, a drive shaft of the DC motor is rotated and thus a crankshaft of the engine is driven to rotate.
  • the engine is started by the engagement of a drive pinion provided on the drive shaft of the DC motor with a ring gear on a flywheel of the engine.
  • the transmission mechanism of the starter motor is coupled to the drive shaft of the DC motor. After the engine is started, the transmission mechanism disengages the pinion from the ring gear to prevent the DC motor from being operated at excessive speeds.
  • a solenoid switch of the starter motor performs two functions: to move the drive pinion outwards to engage in the engine's ring gear; and to complete the main circuit of the DC motor.
  • the solenoid switch can be subjected to high loads and thus is widely used.
  • Fig. 1 is a schematic view of a starter motor in the prior art.
  • Fig. 2 is a partial enlarged view of the starter motor as shown in Fig. 1 showing the structure of its solenoid switch 100.
  • a contact member 103 of the solenoid switch 100 is moved towards the right side of Fig. 2 by the magnetic force of a coil, and then comes into contact with end faces of both electrical terminals 108 to close the main circuit of the starter motor.
  • a plunger 107 of the solenoid switch 100 is moved, together with a movable core 106, towards the right side of Fig. 2 in such a way that a pinion-engaging lever 200 in Fig. 1 is pivoted to engage a drive pinion with a ring gear on the engine's flywheel against the action of an engagement spring 300. In this way, the engine is started.
  • the movable core 106 should rapidly return to its resting position (at the left side of Fig. 2) by the opposite magnetic force of the coil and by return springs 104 and 105, such that the pinion of the starter motor is disengaged from the ring gear.
  • the contact member 103 should be brought out of contact with the end faces of the electrical terminals 108 under the action of a return spring 101, so that the main circuit of the starter motor is disconnected and the starter motor is switched off.
  • the contact member 103 can not be brought out of contact with the end faces of the electrical terminals 108, since the pushing shaft 102 is relatively light and the spring force of the return spring 101 exerted on the pushing shaft 102 is relatively small. In this way, material adhesion or contact welding will occur between the contact member 103 and the electrical terminals 108. Further, if the contact member 103 and the electrical terminals 108 are welded together, an electrical current of up to 1500-2500A will flow through the solenoid switch 100 which will result in the burn-out of the solenoid switch 100.
  • FIG. 3 is a view of another conventional solenoid switch 100 with the "fixed contact shaft structure".
  • a solenoid switch 1000 as shown in Fig. 3 a riveting element 202 is fixed to a movable core 203 against a return spring 204, and a plunger 201 extends through the riveting element 202.
  • the riveting element 202 has to be riveted or coupled to the movable core 203.
  • a special tool and an additional process are required to assemble the respective components.
  • solenoid switch for a starter in which solenoid switch a plunger for moving a movable core and a pushing rod for moving a contact member can be easily and firmly coupled together, and any risk of contact welding can be effectively avoided.
  • the present invention provides a solenoid switch for a starter motor, the solenoid switch comprising: a housing; a pushing rod arranged in the housing and being movable in an axial direction of the housing to close or open a main circuit of the starter motor; a plunger arranged in the housing and being movable in the axial direction such that the starter motor is capable to start an engine and to disconnect the power supply from the engine to the starter motor after the engine is started; and a sleeve member for coupling adjacent end portions of the pushing rod and the plunger; wherein at least one end portion of the sleeve element is provided with at least two slots, by which at least two flexible arms are formed in the sleeve member; and first engaging means and second engaging means are formed in the flexible arms of the sleeve element, respectively, to engage with the adjacent end portions of the pushing rod and the plunger.
  • the solenoid switch With the configuration of the solenoid switch according to the present invention, it is easy to couple the plunger for moving the movable core of the solenoid switch and the pushing rod for moving the contact member together as an integral structure, thereby effectively avoiding any risk of adhesion or contact welding between the contact member and the electrical terminals.
  • the first engaging means and the second engaging means may have the same number of engaging portions.
  • the first engaging means and the second engaging means may each have the engaging portions in even number.
  • the engaging portions of the first engaging means and the engaging portions of the second engaging means are alternately formed in the two flexible arms in the circumferential direction of the sleeve element, and are spaced apart from each other in the axial direction.
  • At least two slots are formed in each of the two end portions of the sleeve element, and form at least two flexible arms in each end portion of the sleeve member; and the first engaging means and the second engaging means are formed respectively on the inner walls of the at least two flexible arms in each end portion of the sleeve member.
  • the first engaging means or the second engaging means comprises catching means with a guiding slope for guiding the insertion of the end portion of the pushing rod or the plunger into the sleeve element and with an opposite stop portion by which the disengagement of the sleeve element from the pushing rod or the plunger is prevented.
  • catching means with a guiding slope for guiding the insertion of the end portion of the pushing rod or the plunger into the sleeve element and with an opposite stop portion by which the disengagement of the sleeve element from the pushing rod or the plunger is prevented.
  • first engaging means and the second engaging means are embodied as engagement recesses, and the adjacent end portions of the pushing rod and the plunger are provided with mating engagement protrusions.
  • first engaging means and the second engaging means are embodied as engagement protrusions, and the adjacent end portions of the pushing rod and the plunger are provided with mating engagement recesses.
  • the solenoid switch further comprises elastic means which is assembled around the outer periphery of the sleeve element and is used to separate the plunger and the pushing rod from each other in the axial direction.
  • the present invention further relates to a starter motor for use in a motor vehicle, comprising a solenoid switch as described above. After the starter motor is energized, a pinion of the starter motor is moved outwards to engage a ring gear on a flywheel of the engine, and the starter motor establishes a mechanical link between itself and the engine. After the engine starts to operate, the starter-motor main circuit is switched off. The engine is successfully started.
  • Fig. 1 is a schematic view of a starter motor in the prior art.
  • Fig. 2 is a partial enlarged view of the starter motor as shown in Fig. 1 showing the structure of its solenoid switch.
  • Fig. 3 is a view of another conventional solenoid switch.
  • Fig. 4 shows the structure of a solenoid switch of a starter motor according to the present invention.
  • Fig. 5 shows the main circuit of the starter motor.
  • Fig. 6 is a partial cut perspective view of a sleeve element of the solenoid switch according to the present invention.
  • Fig. 7 is an end view of the sleeve element in Fig. 6.
  • Fig. 8 is an end view of a sleeve element according to another embodiment.
  • Fig. 9 is a partial enlarged view of the solenoid switch shown in Fig. 4 showing the sleeve element, the pushing rod and the plunger.
  • Fig. 10 is a partial cut perspective view of a sleeve element according to another embodiment.
  • Fig. 4 shows a schematic cross sectional view of a solenoid switch 1 for a starter motor according to the present invention.
  • an ignition switch When an ignition switch is in the starting position, it completes an electric circuit that energizes the starter- motor solenoid switch 1, and a pinion (not shown in Fig. 4) of the starter motor is moved outwards by means of a pinion-engaging lever (not shown in Fig. 4) and comes into contact with and engages a ring gear of an engine flywheel (not shown in Fig. 4), with the result that the engine can be started.
  • the main circuit of the starter motor is broken, and the pinion is disengaged from the ring gear of the flywheel.
  • the solenoid switch 1 comprises a fixed core 4 secured to a housing of the solenoid switch 1 and protruding into a solenoid coil 6 of the solenoid switch 1 from one side (the right side of Fig. 4).
  • a pushing rod 2 is provided in the housing and is movable in an axial direction X of the housing.
  • the pushing rod 2 penetrates through the fixed core 4 and is movable relative to the fixed core 4 in the axial direction X.
  • the pushing rod 2 is fixedly provided at one of its ends with a contact member 3 for closing or opening the starter-motor main circuit.
  • the contact member 3 is in the form of a disc.
  • the contact member 3 may be of the shape of a bridge, a standard cone or a truncated cone, as long as it can be brought into contact with the end faces of two electrical terminals 10 to close the starter- motor main circuit.
  • a movable core 8 is arranged in the housing and protrudes into the solenoid coil 6 of the solenoid switch 1 from the other side of the solenoid switch 1 (the left side in Fig. 4).
  • a plunger 9 is also arranged in the housing and is movable in the axial direction X of the housing. As shown in Fig. 4, the plunger 9 penetrates through the center of the movable core 8 and is fixedly connected to the movable core 8. After a solenoid- switch circuit is closed, the movable core 8 and the plunger 9 are moved towards the fixed core 4 in the axial direction X by the magnetic force of the solenoid coil 6. Then the contact member 3 is brought into contact with the end faces of the two electrical terminals 10 to complete the starter-motor main circuit.
  • the distance between the fixed core 4 and the movable core 8 when at rest represents the maximum travel distance of the movable core 8.
  • the housing of the solenoid switch 1, the fixed core 4 and the movable core 8 together form a magnetic circuit.
  • Fig. 5 shows a solenoid- switch circuit according to the present invention. The operating sequence of the starter motor according to the present invention will be described hereinafter with reference to Figs. 4 and 5.
  • the solenoid coil 6 in Fig. 4 consists of a holding-in winding HW and an engaging winding EW, wherein the winding directions of the holding-in winding HW and the engaging winding EW are the same.
  • an ignition switch 120 in Fig. 5 When an ignition switch 120 in Fig. 5 is in the starting position, the current flows through the holding-in winding HW and the engaging winding EW in the same direction, and the magnetic forces generated by the holding-in winding HW and the engaging winding EW have the same direction and are superposed on each other. In this case, a resultant magnetic force obtained by the two magnetic forces will drive the movable core 8, the plunger 9, the pushing rod 2 and the contact member 3 to move towards the right side of Fig. 4 until the contact member 3 is brought into contact with the end faces of the two electrical terminals 10.
  • the ignition switch 120 is released and the current flows in such an order of T30 ⁇ T45 ⁇ the engaging winding EW ⁇ the holding-in winding HW ⁇ Ground 31.
  • the current flows through the engaging winding EW and the holding-in winding HW in opposite directions and the magnetic fields of the two windings cancel each other out.
  • the contact member 3 should be moved towards the left side in Fig. 4 by a return spring 5 and the elastic means 7 shown in Fig. 4 (and another spring which is not shown in Fig. 4 but is similar to the return spring 101 shown in Fig. 2), to separate the contact member 3 from the electrical terminals 10. Otherwise, the solenoid switch 1 will possibly burn out at high electrical currents.
  • the movable core 8 and the plunger 9 are fixedly connected to each other.
  • the solenoid switch 1 is provided with a sleeve element 11. An end portion of the plunger 9 and an adjacent end portion of the pushing rod 2 are inserted into the sleeve element 11, and they are retained or secured by the sleeve element 11.
  • the plunger 9 and the pushing rod 2 are fastened together by the sleeve element 11 and form an integral structure.
  • the engagement spring 300 of the starter motor in Fig. 1 together with the elastic means 7 (for example, a spring positioned around the outer periphery of the sleeve element 11) in Fig. 4 will exert a pushing force on the plunger 9, the movable core 8 and the pinion-engaging lever 200, thereby to separate the contact member 3 from the end faces of the electrical terminals 10.
  • the force for separating the contact member 3 from the end faces of the electrical terminals 10 is notably increased. There is no need to increase the magnetic force by increasing the turns of the windings, and thus the space and cost may be saved.
  • the plunger 9 fixedly connected to the movable core 8 is provided with an opening 12 at its left end portion for operating an upper end portion of the pinion-engaging lever 200 (as shown in Fig. 1).
  • the movable core 8 and the plunger 9 are inserted into the housing from the left side of the solenoid switch 1.
  • the pushing rod 2, the contact member 3 and the fixed core 4 are inserted into the housing from the right side of the solenoid switch 1.
  • the plunger 9 and the pushing rod 2 are coupled or fastened by the sleeve element 11.
  • the elastic means 7 is also arranged around the outer periphery of the sleeve element 11 within the solenoid switch 1. The elastic means 7 acts to separate the plunger 9 and the pushing rod 2 from each other in the axial direction X of the housing.
  • the inventors of the present invention have modified the sleeve element 11 for coupling the plunger 9 and the pushing rod 2 together.
  • the basic structure of the sleeve element 11 of the solenoid switch 1 according to the invention is shown in Fig. 6.
  • the sleeve element 11 comprises a cylindrical wall 111.
  • One end portion of the cylindrical wall 111 is formed with at least two slots 112.
  • the cylindrical wall 111 of the sleeve element 11 can be formed with four slots 112.
  • the four slots 112 form the four corresponding flexible arms 113 in the sleeve element 11.
  • the cylindrical wall 111 of the sleeve element 11 is formed with six slots 112 and thus six flexible arms 113 are formed. According to the above teaching, one skilled in the art can understand that the cylindrical wall 111 of the sleeve element 11 can be formed with eight or more slots 112, and the corresponding number of flexible arms can be formed in the cylindrical wall 111.
  • the sleeve element 11 is formed from a material with predetermined elasticity, so that the flexible arms 113 may have the necessary flexibility.
  • the flexible arms 113 of the sleeve element 11 will flex outwards under the pressing force of the end portion of the plunger 9 or the pushing rod 2.
  • the outward pressing force exerted on the cylindrical wall 111 of the sleeve element 11 disappears and the flexible arms 113 returns to their original positions due to its own flexibility.
  • FIG. 9 is a partial enlarged view of the solenoid switch 1 in Fig. 4 showing the sleeve element 11, the pushing rod 2, the plunger 9 as well as the first engaging means 114 and the second engaging means 115.
  • the sleeve element 11 is firstly placed inside the housing of the solenoid switch 1. Then, the plunger 9 is inserted into the sleeve element 11 from one side of the sleeve element 11 (the left side in Figs. 4 and 9), and the first engaging means 114 of the sleeve element 11 is brought into engagement with the right end portion of the plunger 9.
  • the first engaging means 114 of the sleeve element 11 may be an engagement protrusion, and the end portion of the plunger 9 inserted into the sleeve element 11 may have an engagement recess with the mating shape. Alternatively, if the first engaging means 114 of the sleeve element 11 is an engagement recess, the end portion of the plunger 9 inserted into the sleeve element 11 may have an engagement protrusion with the mating shape.
  • the pushing rod 2 is inserted into the sleeve element 11 from the other side of the sleeve element 11 (the right side in Figs. 4 and 9).
  • the second engaging means 115 of the sleeve element 11 is brought into engagement with the end portion of the pushing rod 2.
  • the second engaging means 115 of the sleeve element 11 may be an engagement protrusion, and the end portion of the pushing rod 2 inserted into the sleeve element 11 may have an engagement recess with the mating shape.
  • the second engaging means 115 of the sleeve element 11 is an engagement recess
  • the end portion of the pushing rod 2 inserted into the sleeve element 11 may have an engagement protrusion with the mating shape.
  • the first engaging means 114 and the second engaging means 115 may each have the engaging portions in even number, with the result that the sleeve element 11 can fixedly engage the end portions of the pushing rod 2 and of the plunger 9.
  • the engagement portions of the first engaging means 114 and the engagement portions of the second engaging means 115 are spaced apart from each other by a distance in the axial direction X.
  • Two adjacent end faces of the pushing rod 2 and the plunger 9 are configured to bear against each other when the engagement portions of the first engaging means 114 and the engagement portions of the second engaging means 115 engage the end portions of the plunger 9 and the pushing rod 2, so as to form an integral structure with the sleeve element 11.
  • the first engaging means 114 and the second engaging means 115 may have the same number of engaging portions.
  • the engaging portions of the first engaging means and the engaging portions of the second engaging means may be alternately formed in the flexible arms 113 in the circumferential direction of the sleeve element 11, as shown in Figs. 6, 7 and 8. With this configuration, the sleeve element 11 can firmly engage the plunger 9 and the pushing rod 2.
  • each of the two end portions of the sleeve element 11 is formed with at least two slots 112' (or 112").
  • Two opposite flexible arms 113' and 113" are formed by the slots 112' and 112" at the two end portions of the sleeve element 11.
  • First engaging means 114' and second engaging means 115' are formed respectively on the inner walls 111 of the two opposite flexible arms 113' and 113" in each end portion of the sleeve member 11, to engage the adjacent end portions of the pushing rod 2 and the plunger 9.
  • the first engaging means 114 comprises first catching means.
  • the first catching means of the first engaging means 114 may comprise a guiding slope 114A for guiding the insertion of the end portion of the pushing rod 2 or the plunger 9 into the sleeve element 11 and an opposite stop portion 114B by which the disengagement of the sleeve element 11 from the pushing rod 2 or the plunger 9 is prevented.
  • the guiding slope 114A and the stop portion 114B of the first engaging means 114 can facilitate the insertion of the end portion of the pushing rod 2 or the plunger 9 into the sleeve element 11, and prevent any undesirable disengagement of the pushing rod 2 or plunger 9 from the sleeve element 11.
  • the second engaging means 115 of the sleeve element 11 also comprises second catching means.
  • the second catching means of the second engaging means 115 comprises a guiding slope 115A for guiding the insertion of the other end portion of the pushing rod 2 or the plunger 9 into the sleeve element 11 and an opposite stop portion 115B by which the disengagement of the sleeve element 11 from the pushing rod 2 or the plunger 9 is prevented.
  • the present invention also discloses a starter motor for use in a motor vehicle.
  • the starter motor comprises the solenoid switch 1 as described with one or more of the above-mentioned features.
  • an ignition switch When an ignition switch is in the starting position, the starter motor is energized, and a pinion of the starter motor is moved outwards to engage with a ring gear on a flywheel of the engine. Then the starter motor establishes a mechanical link between itself and the engine.
  • the starter-motor main circuit is switched off, and the pinion of the starter motor is disengaged from the ring gear on the flywheel of the engine. The engine is successfully started.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Electromagnets (AREA)
  • Push-Button Switches (AREA)

Abstract

A solenoid switch (1) for a starter motor comprises a sleeve member (11) for coupling adjacent end portions of a pushing rod (9) for moving a movable core (8) and a plunger (2) for moving a contact member (3). At least one end portion of the sleeve element is provided with at least two slots (112), by which at least two flexible arms (113) are formed in the sleeve member. A first engaging means (114, 114') and a second engaging means (115, 115') which are formed in the two flexible arms of the sleeve element are engaged with the adjacent end portions of the pushing rod and the plunger respectively. In the solenoid switch, the plunger and the pushing rod can be firmly coupled together, and the contact welding can be effectively avoided.

Description

Solenoid Switch and Starter Motor comprising the same
Technical Field
The present invention relates to a solenoid switch for completing a main circuit of a starter motor and for moving a drive pinion of the starter motor outwards to engage in a ring gear on an engine flywheel. The present invention also relates to a starter motor comprising such a solenoid switch.
Background
An engine of a motor vehicle is normally started by an electric starter motor. The starter motor drives the engine of the motor vehicle to operate at a high speed until the engine can operate independently and generate its own power output.
The starter motor consists of a direct current (DC) motor, a transmission mechanism and a control mechanism. The DC motor obtains its electrical power supply from a battery and generates a rotary torque. When an ignition switch is switched on, a drive shaft of the DC motor is rotated and thus a crankshaft of the engine is driven to rotate. In other words, the engine is started by the engagement of a drive pinion provided on the drive shaft of the DC motor with a ring gear on a flywheel of the engine. The transmission mechanism of the starter motor is coupled to the drive shaft of the DC motor. After the engine is started, the transmission mechanism disengages the pinion from the ring gear to prevent the DC motor from being operated at excessive speeds.
One example of the control mechanism of the starter motor is a solenoid switch. A solenoid switch of the starter motor performs two functions: to move the drive pinion outwards to engage in the engine's ring gear; and to complete the main circuit of the DC motor. The solenoid switch can be subjected to high loads and thus is widely used.
Fig. 1 is a schematic view of a starter motor in the prior art. Fig. 2 is a partial enlarged view of the starter motor as shown in Fig. 1 showing the structure of its solenoid switch 100.
With reference to Figs. 1 and 2, when an ignition switch of the motor vehicle is switched on, a contact member 103 of the solenoid switch 100 is moved towards the right side of Fig. 2 by the magnetic force of a coil, and then comes into contact with end faces of both electrical terminals 108 to close the main circuit of the starter motor. At the same time, a plunger 107 of the solenoid switch 100 is moved, together with a movable core 106, towards the right side of Fig. 2 in such a way that a pinion-engaging lever 200 in Fig. 1 is pivoted to engage a drive pinion with a ring gear on the engine's flywheel against the action of an engagement spring 300. In this way, the engine is started. Under ideal circumstances, immediately after the ignition switch is released, the movable core 106 should rapidly return to its resting position (at the left side of Fig. 2) by the opposite magnetic force of the coil and by return springs 104 and 105, such that the pinion of the starter motor is disengaged from the ring gear. At the same time, the contact member 103 should be brought out of contact with the end faces of the electrical terminals 108 under the action of a return spring 101, so that the main circuit of the starter motor is disconnected and the starter motor is switched off.
However, in some cases, the contact member 103 can not be brought out of contact with the end faces of the electrical terminals 108, since the pushing shaft 102 is relatively light and the spring force of the return spring 101 exerted on the pushing shaft 102 is relatively small. In this way, material adhesion or contact welding will occur between the contact member 103 and the electrical terminals 108. Further, if the contact member 103 and the electrical terminals 108 are welded together, an electrical current of up to 1500-2500A will flow through the solenoid switch 100 which will result in the burn-out of the solenoid switch 100.
To reduce the risk of contact welding between the contact member 103 and the end faces of the electrical terminals 108, a so called "fixed contact shaft" structure is used. Fig. 3 is a view of another conventional solenoid switch 100 with the "fixed contact shaft structure". In a solenoid switch 1000 as shown in Fig. 3, a riveting element 202 is fixed to a movable core 203 against a return spring 204, and a plunger 201 extends through the riveting element 202. During the processes of assembling the solenoid switch 1000, the riveting element 202 has to be riveted or coupled to the movable core 203. Thus, a special tool and an additional process are required to assemble the respective components.
Therefore, it is desirable to provide a solenoid switch for a starter in which solenoid switch a plunger for moving a movable core and a pushing rod for moving a contact member can be easily and firmly coupled together, and any risk of contact welding can be effectively avoided.
Contents of the Invention
The present invention provides a solenoid switch for a starter motor, the solenoid switch comprising: a housing; a pushing rod arranged in the housing and being movable in an axial direction of the housing to close or open a main circuit of the starter motor; a plunger arranged in the housing and being movable in the axial direction such that the starter motor is capable to start an engine and to disconnect the power supply from the engine to the starter motor after the engine is started; and a sleeve member for coupling adjacent end portions of the pushing rod and the plunger; wherein at least one end portion of the sleeve element is provided with at least two slots, by which at least two flexible arms are formed in the sleeve member; and first engaging means and second engaging means are formed in the flexible arms of the sleeve element, respectively, to engage with the adjacent end portions of the pushing rod and the plunger. With the configuration of the solenoid switch according to the present invention, it is easy to couple the plunger for moving the movable core of the solenoid switch and the pushing rod for moving the contact member together as an integral structure, thereby effectively avoiding any risk of adhesion or contact welding between the contact member and the electrical terminals.
Preferably, the first engaging means and the second engaging means may have the same number of engaging portions. Besides, the first engaging means and the second engaging means may each have the engaging portions in even number.
Preferably, the engaging portions of the first engaging means and the engaging portions of the second engaging means are alternately formed in the two flexible arms in the circumferential direction of the sleeve element, and are spaced apart from each other in the axial direction. With the above arrangement, the engagement between the plunger, the pushing rod and the sleeve element becomes more firm.
Preferably, at least two slots are formed in each of the two end portions of the sleeve element, and form at least two flexible arms in each end portion of the sleeve member; and the first engaging means and the second engaging means are formed respectively on the inner walls of the at least two flexible arms in each end portion of the sleeve member.
Preferably, the first engaging means or the second engaging means comprises catching means with a guiding slope for guiding the insertion of the end portion of the pushing rod or the plunger into the sleeve element and with an opposite stop portion by which the disengagement of the sleeve element from the pushing rod or the plunger is prevented. With the above arrangement, any undesirable disengagement between the pushing rod or plunger and the sleeve element can be prevented. It is easy and convenient to secure the first and second engaging means of the sleeve element with the pushing rod and the plunger.
Preferably, the first engaging means and the second engaging means are embodied as engagement recesses, and the adjacent end portions of the pushing rod and the plunger are provided with mating engagement protrusions.
Alternatively, the first engaging means and the second engaging means are embodied as engagement protrusions, and the adjacent end portions of the pushing rod and the plunger are provided with mating engagement recesses.
Preferably, the solenoid switch further comprises elastic means which is assembled around the outer periphery of the sleeve element and is used to separate the plunger and the pushing rod from each other in the axial direction.
The present invention further relates to a starter motor for use in a motor vehicle, comprising a solenoid switch as described above. After the starter motor is energized, a pinion of the starter motor is moved outwards to engage a ring gear on a flywheel of the engine, and the starter motor establishes a mechanical link between itself and the engine. After the engine starts to operate, the starter-motor main circuit is switched off. The engine is successfully started.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic view of a starter motor in the prior art.
Fig. 2 is a partial enlarged view of the starter motor as shown in Fig. 1 showing the structure of its solenoid switch.
Fig. 3 is a view of another conventional solenoid switch.
Fig. 4 shows the structure of a solenoid switch of a starter motor according to the present invention.
Fig. 5 shows the main circuit of the starter motor.
Fig. 6 is a partial cut perspective view of a sleeve element of the solenoid switch according to the present invention.
Fig. 7 is an end view of the sleeve element in Fig. 6.
Fig. 8 is an end view of a sleeve element according to another embodiment.
Fig. 9 is a partial enlarged view of the solenoid switch shown in Fig. 4 showing the sleeve element, the pushing rod and the plunger.
Fig. 10 is a partial cut perspective view of a sleeve element according to another embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Hereinafter, the present invention will be described in details with reference to Figs. 4-10. In the following figures, the same reference signs are used to represent the same or similar elements.
Fig. 4 shows a schematic cross sectional view of a solenoid switch 1 for a starter motor according to the present invention. When an ignition switch is in the starting position, it completes an electric circuit that energizes the starter- motor solenoid switch 1, and a pinion (not shown in Fig. 4) of the starter motor is moved outwards by means of a pinion-engaging lever (not shown in Fig. 4) and comes into contact with and engages a ring gear of an engine flywheel (not shown in Fig. 4), with the result that the engine can be started. Once the engine has been started, the main circuit of the starter motor is broken, and the pinion is disengaged from the ring gear of the flywheel.
As shown in Fig. 4, the solenoid switch 1 comprises a fixed core 4 secured to a housing of the solenoid switch 1 and protruding into a solenoid coil 6 of the solenoid switch 1 from one side (the right side of Fig. 4). A pushing rod 2 is provided in the housing and is movable in an axial direction X of the housing. The pushing rod 2 penetrates through the fixed core 4 and is movable relative to the fixed core 4 in the axial direction X. The pushing rod 2 is fixedly provided at one of its ends with a contact member 3 for closing or opening the starter-motor main circuit. As shown in Fig. 4, the contact member 3 is in the form of a disc. However, one skilled in the art can understand that the contact member 3 is not limited to it. The contact member 3 may be of the shape of a bridge, a standard cone or a truncated cone, as long as it can be brought into contact with the end faces of two electrical terminals 10 to close the starter- motor main circuit.
A movable core 8 is arranged in the housing and protrudes into the solenoid coil 6 of the solenoid switch 1 from the other side of the solenoid switch 1 (the left side in Fig. 4). A plunger 9 is also arranged in the housing and is movable in the axial direction X of the housing. As shown in Fig. 4, the plunger 9 penetrates through the center of the movable core 8 and is fixedly connected to the movable core 8. After a solenoid- switch circuit is closed, the movable core 8 and the plunger 9 are moved towards the fixed core 4 in the axial direction X by the magnetic force of the solenoid coil 6. Then the contact member 3 is brought into contact with the end faces of the two electrical terminals 10 to complete the starter-motor main circuit. Along with the movement of the plunger 9 towards the right side of Fig. 4, the pinion-engaging lever associated with the plunger 9 is driven to move the pinion toward and engage the engine ring gear. Moreover, elastic means 7, for example a return spring, is arranged between the fixed core 4 and the movable core 8.
The distance between the fixed core 4 and the movable core 8 when at rest represents the maximum travel distance of the movable core 8. In Fig. 4, the housing of the solenoid switch 1, the fixed core 4 and the movable core 8 together form a magnetic circuit.
Fig. 5 shows a solenoid- switch circuit according to the present invention. The operating sequence of the starter motor according to the present invention will be described hereinafter with reference to Figs. 4 and 5.
As shown in Fig. 5, the solenoid coil 6 in Fig. 4 consists of a holding-in winding HW and an engaging winding EW, wherein the winding directions of the holding-in winding HW and the engaging winding EW are the same. When an ignition switch 120 in Fig. 5 is in the starting position, the current flows through the holding-in winding HW and the engaging winding EW in the same direction, and the magnetic forces generated by the holding-in winding HW and the engaging winding EW have the same direction and are superposed on each other. In this case, a resultant magnetic force obtained by the two magnetic forces will drive the movable core 8, the plunger 9, the pushing rod 2 and the contact member 3 to move towards the right side of Fig. 4 until the contact member 3 is brought into contact with the end faces of the two electrical terminals 10.
Once the contact member 3 makes contact with the end faces of the two electrical terminals 10, the voltage at point T50 in the circuit shown in Fig. 5 is equal to the voltage at point T45 and thus the engaging winding EW is short-circuited. However, at this moment, the electrical current still flows through the holding-in winding HW.
With reference to Fig. 5, after the engine is started, the ignition switch 120 is released and the current flows in such an order of T30 → T45 → the engaging winding EW → the holding-in winding HW → Ground 31. The current flows through the engaging winding EW and the holding-in winding HW in opposite directions and the magnetic fields of the two windings cancel each other out. At this time, the contact member 3 should be moved towards the left side in Fig. 4 by a return spring 5 and the elastic means 7 shown in Fig. 4 (and another spring which is not shown in Fig. 4 but is similar to the return spring 101 shown in Fig. 2), to separate the contact member 3 from the electrical terminals 10. Otherwise, the solenoid switch 1 will possibly burn out at high electrical currents.
As shown in Fig. 4, the movable core 8 and the plunger 9 are fixedly connected to each other. In order to ensure that the contact member 3 can be quickly disconnected from the electrical terminals 10 as desired, the solenoid switch 1 according to the present invention is provided with a sleeve element 11. An end portion of the plunger 9 and an adjacent end portion of the pushing rod 2 are inserted into the sleeve element 11, and they are retained or secured by the sleeve element 11.
Thus, the plunger 9 and the pushing rod 2 are fastened together by the sleeve element 11 and form an integral structure. When the contact member 3 is moved towards the left side in Fig. 4 so as to lose contact with the end faces of the electrical terminals 10, the engagement spring 300 of the starter motor in Fig. 1 together with the elastic means 7 (for example, a spring positioned around the outer periphery of the sleeve element 11) in Fig. 4 will exert a pushing force on the plunger 9, the movable core 8 and the pinion-engaging lever 200, thereby to separate the contact member 3 from the end faces of the electrical terminals 10. In contrast to the structure shown in Fig. 3, the force for separating the contact member 3 from the end faces of the electrical terminals 10 is notably increased. There is no need to increase the magnetic force by increasing the turns of the windings, and thus the space and cost may be saved.
In the solenoid switch 1 shown in Fig. 4, the plunger 9 fixedly connected to the movable core 8 is provided with an opening 12 at its left end portion for operating an upper end portion of the pinion-engaging lever 200 (as shown in Fig. 1). At the time of assembling the solenoid switch 1, the movable core 8 and the plunger 9 are inserted into the housing from the left side of the solenoid switch 1. The pushing rod 2, the contact member 3 and the fixed core 4 are inserted into the housing from the right side of the solenoid switch 1. The plunger 9 and the pushing rod 2 are coupled or fastened by the sleeve element 11. Moreover, the elastic means 7 is also arranged around the outer periphery of the sleeve element 11 within the solenoid switch 1. The elastic means 7 acts to separate the plunger 9 and the pushing rod 2 from each other in the axial direction X of the housing.
Due to the above assembling sequence, it is difficult to couple or fasten the plunger 9 and the pushing rod 2 by means of the sleeve element 11 so as to break the contact between the contact member 3 and the electrical terminals 10 as desired.
In order to solve the above problem, the inventors of the present invention have modified the sleeve element 11 for coupling the plunger 9 and the pushing rod 2 together. The basic structure of the sleeve element 11 of the solenoid switch 1 according to the invention is shown in Fig. 6.
As shown in Fig. 6, the sleeve element 11 comprises a cylindrical wall 111. One end portion of the cylindrical wall 111 is formed with at least two slots 112. Alternatively, as shown in Fig. 7, the cylindrical wall 111 of the sleeve element 11 can be formed with four slots 112. The four slots 112 form the four corresponding flexible arms 113 in the sleeve element 11.
In a variant embodiment shown in Fig. 8, the cylindrical wall 111 of the sleeve element 11 is formed with six slots 112 and thus six flexible arms 113 are formed. According to the above teaching, one skilled in the art can understand that the cylindrical wall 111 of the sleeve element 11 can be formed with eight or more slots 112, and the corresponding number of flexible arms can be formed in the cylindrical wall 111.
The sleeve element 11 is formed from a material with predetermined elasticity, so that the flexible arms 113 may have the necessary flexibility. When the end portion of the plunger 9 or the pushing rod 2 is inserted into the sleeve element 11, the flexible arms 113 of the sleeve element 11 will flex outwards under the pressing force of the end portion of the plunger 9 or the pushing rod 2. After the end portion of the plunger 9 or the pushing rod 2 has been inserted into the sleeve element 11, the outward pressing force exerted on the cylindrical wall 111 of the sleeve element 11 disappears and the flexible arms 113 returns to their original positions due to its own flexibility.
As shown in Fig. 6, the flexible arms 113 of the sleeve element 11 are provided with first engaging means 114 and second engaging means 115 which will engage or catch hold of two adjacent end portions of the pushing rod 2 and the plunger 9, respectively. Fig. 9 is a partial enlarged view of the solenoid switch 1 in Fig. 4 showing the sleeve element 11, the pushing rod 2, the plunger 9 as well as the first engaging means 114 and the second engaging means 115.
With reference to Figs. 4, 6 and 9, at the time of assembling the solenoid switch 1 of the starter motor, the sleeve element 11 is firstly placed inside the housing of the solenoid switch 1. Then, the plunger 9 is inserted into the sleeve element 11 from one side of the sleeve element 11 (the left side in Figs. 4 and 9), and the first engaging means 114 of the sleeve element 11 is brought into engagement with the right end portion of the plunger 9. The first engaging means 114 of the sleeve element 11 may be an engagement protrusion, and the end portion of the plunger 9 inserted into the sleeve element 11 may have an engagement recess with the mating shape. Alternatively, if the first engaging means 114 of the sleeve element 11 is an engagement recess, the end portion of the plunger 9 inserted into the sleeve element 11 may have an engagement protrusion with the mating shape.
On the other hand, the pushing rod 2 is inserted into the sleeve element 11 from the other side of the sleeve element 11 (the right side in Figs. 4 and 9). The second engaging means 115 of the sleeve element 11 is brought into engagement with the end portion of the pushing rod 2. The second engaging means 115 of the sleeve element 11 may be an engagement protrusion, and the end portion of the pushing rod 2 inserted into the sleeve element 11 may have an engagement recess with the mating shape. Alternatively, if the second engaging means 115 of the sleeve element 11 is an engagement recess, the end portion of the pushing rod 2 inserted into the sleeve element 11 may have an engagement protrusion with the mating shape.
Preferably, the first engaging means 114 and the second engaging means 115 may each have the engaging portions in even number, with the result that the sleeve element 11 can fixedly engage the end portions of the pushing rod 2 and of the plunger 9.
As shown in Figs. 4, 6 and 9, the engagement portions of the first engaging means 114 and the engagement portions of the second engaging means 115 are spaced apart from each other by a distance in the axial direction X. Two adjacent end faces of the pushing rod 2 and the plunger 9 are configured to bear against each other when the engagement portions of the first engaging means 114 and the engagement portions of the second engaging means 115 engage the end portions of the plunger 9 and the pushing rod 2, so as to form an integral structure with the sleeve element 11.
Preferably, the first engaging means 114 and the second engaging means 115 may have the same number of engaging portions. The engaging portions of the first engaging means and the engaging portions of the second engaging means may be alternately formed in the flexible arms 113 in the circumferential direction of the sleeve element 11, as shown in Figs. 6, 7 and 8. With this configuration, the sleeve element 11 can firmly engage the plunger 9 and the pushing rod 2.
As a further preferred embodiment shown in Fig. 10, each of the two end portions of the sleeve element 11 is formed with at least two slots 112' (or 112"). Two opposite flexible arms 113' and 113" are formed by the slots 112' and 112" at the two end portions of the sleeve element 11. First engaging means 114' and second engaging means 115' are formed respectively on the inner walls 111 of the two opposite flexible arms 113' and 113" in each end portion of the sleeve member 11, to engage the adjacent end portions of the pushing rod 2 and the plunger 9.
As shown in Fig. 6 or 10, the first engaging means 114 (or 114') and the second engaging means 115 (or 115') of the sleeve element 11 may be modified. The first engaging means 114 comprises first catching means. The first catching means of the first engaging means 114 may comprise a guiding slope 114A for guiding the insertion of the end portion of the pushing rod 2 or the plunger 9 into the sleeve element 11 and an opposite stop portion 114B by which the disengagement of the sleeve element 11 from the pushing rod 2 or the plunger 9 is prevented. The guiding slope 114A and the stop portion 114B of the first engaging means 114 can facilitate the insertion of the end portion of the pushing rod 2 or the plunger 9 into the sleeve element 11, and prevent any undesirable disengagement of the pushing rod 2 or plunger 9 from the sleeve element 11.
Similarly, the second engaging means 115 of the sleeve element 11 also comprises second catching means. The second catching means of the second engaging means 115 comprises a guiding slope 115A for guiding the insertion of the other end portion of the pushing rod 2 or the plunger 9 into the sleeve element 11 and an opposite stop portion 115B by which the disengagement of the sleeve element 11 from the pushing rod 2 or the plunger 9 is prevented. With the first engaging means 114 and the second engaging means 115, the sleeve element 11 can be used to securely couple the pushing rod 2 and the plunger 9, and any undesirable disengagement of the sleeve element 11 from the pushing rod 2 or plunger 9 can be prevented.
The present invention also discloses a starter motor for use in a motor vehicle. The starter motor comprises the solenoid switch 1 as described with one or more of the above-mentioned features. When an ignition switch is in the starting position, the starter motor is energized, and a pinion of the starter motor is moved outwards to engage with a ring gear on a flywheel of the engine. Then the starter motor establishes a mechanical link between itself and the engine. After the engine starts to operate, the starter-motor main circuit is switched off, and the pinion of the starter motor is disengaged from the ring gear on the flywheel of the engine. The engine is successfully started.
The above exemplary embodiments as described are for illustrative purposes only. It shall be understood that these embodiments do not limit the scope of protection of the present invention. Various modifications, changes and replacements can be made without departing from the scope and spirit of the invention, and all fall within the scope of protection defined by the appended claims.

Claims

1. A solenoid switch (1) for a starter motor, the solenoid switch (1) comprising:
a housing;
a pushing rod (2) arranged in the housing and being movable in an axial direction (x) of the housing to close or open a main circuit of the starter motor;
a plunger (9) arranged in the housing and being movable in the axial direction (x) such that the starter motor is capable to start an engine and to disconnect the power supply from the engine to the starter motor after the engine is started; and
a sleeve member (11) for coupling adjacent end portions of the pushing rod (2) and the plunger (9);
wherein at least one end portion of the sleeve element (11) is provided with at least two slots (112), by which at least two flexible arms (113) are formed in the sleeve member (11); and
first engaging means (114, 114') and second engaging means (115, 115') are formed in the flexible arms (113) of the sleeve element (11), respectively, to engage with the adjacent end portions of the pushing rod (2) and the plunger (9).
2. The solenoid switch (1) for a starter motor according to claim 1,
wherein the first engaging means (114) and the second engaging means (115) have the same number of engaging portions.
3. The solenoid switch (1) for a starter motor according to claim 1 or 2,
wherein the first engaging means (114) and the second engaging means (115) each have the engaging portions in even number.
4. The solenoid switch (1) for a starter motor according to claim 2 or 3,
wherein the engaging portions of the first engaging means (114) and the engaging portions of the second engaging means (115) are alternately formed in the two flexible arms (113) in the circumferential direction of the sleeve element (11), and are spaced apart from each other in the axial direction (X).
5. The solenoid switch (1) for a starter motor according to claim 1,
wherein at least two slots (112', 112") are formed in each of the two end portions of the sleeve element (11), and form at least two flexible arms (113) in each end portion of the sleeve member (11); and
the first engaging means (114') and the second engaging means (115') are formed respectively on the inner walls (111) of the at least two flexible arms (113', 113") in each end portion of the sleeve member (11).
6. The solenoid switch (1) for a starter motor according to claim 1 or 5,
wherein the first engaging means (114) or the second engaging means (115) comprises catching means with a guiding slope (114A, 115A) for guiding the insertion of the end portion of the pushing rod (2) or the plunger (9) into the sleeve element (11) and with an opposite stop portion (114B, 115B) by which the disengagement of the sleeve element (11) from the pushing rod (2) or the plunger (9) is prevented.
7. The solenoid switch (1) for a starter motor according to claim 1 or 5,
wherein the first engaging means (114, 114') and the second engaging means (115, 115') are embodied as engagement recesses, and the adjacent end portions of the pushing rod (2) and the plunger (9) are provided with mating engagement protrusions.
8. The solenoid switch (1) for a starter motor according to claim 1 or 5,
wherein the first engaging means (114, 114') and the second engaging means (115, 115') are embodied as engagement protrusions, and the adjacent end portions of the pushing rod (2) and the plunger (9) are provided with mating engagement recesses.
9. The solenoid switch (1) for a starter motor according to any one of claims 1 to 3: wherein the solenoid switch (1) further comprises elastic means (7) which is assembled around the outer periphery of the sleeve element (11) and is used to separate the plunger (9) and the pushing rod (2) from each other in the axial direction (X).
10. A starter motor for use in a motor vehicle, comprising a solenoid switch (1) according to any one of claims 1 to 9.
EP12845259.6A 2011-11-03 2012-11-05 Solenoid switch and starter motor comprising the same Withdrawn EP2774161A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2011103492771A CN103094010A (en) 2011-11-03 2011-11-03 Starter electromagnetic switch and starter comprising the same
PCT/CN2012/084094 WO2013064123A1 (en) 2011-11-03 2012-11-05 Solenoid switch and starter motor comprising the same

Publications (2)

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EP2774161A1 true EP2774161A1 (en) 2014-09-10
EP2774161A4 EP2774161A4 (en) 2015-04-15

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CN (1) CN103094010A (en)
IN (1) IN2014DN03100A (en)
WO (1) WO2013064123A1 (en)

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CN104347316B (en) 2013-07-26 2018-10-26 索恩格汽车部件德国有限公司 Electromagnetic switch and starter
FR3041810B1 (en) * 2015-09-24 2018-11-16 Radiall Sa FRICTION-FREE SWITCHING DEVICE FOR OPENING AND CLOSING AN ELECTRIC LINE WITH IMPROVED IMPROVED MANEUVER
CN110474489B (en) * 2019-08-20 2024-07-16 浙江新特立汽车电器有限公司 Starter

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CN103094010A (en) 2013-05-08
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EP2774161A4 (en) 2015-04-15

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