Airtight electromagnetic switch of starter

Abstract

The utility model relates to an airtight electromagnetic switch for a starter, which comprises a shell assembly, a movable iron core assembly, a static iron core, a push rod assembly and a sealing bush, and is characterized in that the movable iron core assembly and the static iron core are coaxially arranged in an inner cavity of the shell assembly; the push rod assembly penetrates through a center cavity of the static iron core, one end of the push rod assembly is fixedly connected with the movable iron core assembly, the sealing bush is located at the end, close to the static iron core, of the push rod assembly, and the sealing bush is arranged in a gap between the push rod assembly and the static iron core and used for sealing. According to the utility model, the technical problem that the service life of an existing electromagnetic switch is short due to the lack of a good sealing effect is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic switches, in particular to an airtight electromagnetic switch for a starter. Background Art

[0002] The electromagnetic switch is a key component of the automobile starter, and the electromagnetic switch used in the start-stop starter is required to have a durable life of more than 250,000 times. However, the service life of the existing electromagnetic switch is only about 100,000 times, which obviously cannot meet the requirements.

[0003] The Chinese utility model patent with the authorization announcement number CN202796758U discloses "an automobile starter electromagnetic switch", which prevents the looseness between the static iron core and the shell by using a protrusion to clamp the static iron core, thereby extending the service life of the electromagnetic switch. However, in actual use, the sealed cabin does not have a sealing effect after the moving iron core and the static iron core are attracted, and it is easy for water to enter and cause rust, and the short dynamic stroke causes the starter to have scraping teeth; on the other hand, the existing electromagnetic switch push rod is prone to swinging when moving, causing uneven force on the contact copper plate and the contact bolt when in contact, increasing the failure of the contact copper plate due to electro-corrosion and perforation. Therefore, affected by the above factors, the service life of the existing electromagnetic switch is still short and cannot meet the requirements. Utility Model Content

[0004] In view of this, the utility model proposes an airtight electromagnetic switch for a starter to solve the technical problem that the existing electromagnetic switch has a short service life due to the lack of a good sealing effect.

[0005] In order to achieve the above technical objectives, the technical solution of the utility model provides a starter airtight electromagnetic switch, comprising:

[0006] Shell assembly;

[0007] A moving iron core assembly and a stationary iron core, wherein the moving iron core assembly and the stationary iron core are coaxially arranged in the inner cavity of the housing assembly;

[0008] A push rod assembly, wherein the push rod assembly passes through the central cavity of the static iron core, and one end of the push rod assembly is fixedly connected to the moving iron core assembly;

[0009] A sealing bushing is located at one end of the push rod assembly close to the static iron core, and the sealing bushing is arranged in the gap between the push rod assembly and the static iron core for sealing.

[0010] Preferably, the fitting clearance between the sealing bushing and the static iron core is 0.06-0.13 mm.

[0011] Preferably, the push rod assembly includes a push rod, a sealing bushing and a contact copper plate, the push rod is arranged in the central cavity of the static iron core, and one end of the push rod is fixedly connected to the moving iron core assembly, the sealing bushing is sleeved on one end of the push rod away from the moving iron core assembly, and the contact copper plate is fixed on the sealing bushing.

[0012] Preferably, the sealing bushing is formed with a vertical sealing surface and a horizontal sealing surface for sealing the static iron core, and a mounting surface for mounting the contact copper plate.

[0013] Preferably, the push rod assembly further comprises a return spring and an overtravel spring, wherein the return spring and the overtravel spring are sleeved on the outside of the push rod, and one end of the overtravel spring abuts against one end of the sealing bushing.

[0014] Preferably, the moving iron core assembly includes a pull rod and a moving iron core, one end of the pull rod is arranged in the central cavity of the moving iron core, the other end of the pull rod is retained outside the moving iron core, and the end of the moving iron core away from the pull rod is connected to the push rod assembly.

[0015] Preferably, the housing assembly includes a switch shell, a switch cover and a copper sleeve, the switch shell is snap-fitted to one end of the switch cover, the copper sleeve is arranged in the inner cavity of the switch shell, and the moving iron core assembly, the static iron core and the push rod assembly are all arranged inside the copper sleeve.

[0016] Preferably, a protrusion is formed at the corner where the static iron core is connected to the copper sleeve, and the static iron core and the copper sleeve are interference fit through the protrusion.

[0017] Preferably, the electromagnetic switch further comprises an electromagnetic coil, and the electromagnetic coil is arranged in a space formed between the copper sleeve and the switch housing.

[0018] Preferably, the electromagnetic switch further comprises a plug-in assembly, the plug-in assembly comprises a connector and contact bolts, the connector is fixed on the switch cover, and the contact bolts are fixed on the switch cover located on both sides of the connector.

[0019] Compared with the prior art, the beneficial effects of the utility model mainly include:

[0020] The utility model provides an airtight electromagnetic switch for a starter, which seals the electromagnetic switch by adding a sealing bushing between the push rod assembly and the static iron core, thereby avoiding water corrosion caused by poor sealing effect; at the same time, due to the enhanced sealing, the pull-out time of the starter gear is slowed down, thereby increasing the dynamic stroke of the electromagnetic switch, and thus solving the tooth scraping phenomenon of the starter; in addition, the provision of the sealing bushing also limits the push rod assembly, preventing the push rod assembly from swinging when moving, and reducing the occurrence of electro-corrosion perforation failure.

[0021] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the preferred embodiment of the utility model is described in detail as follows with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 This is the overall structural appearance diagram of the electromagnetic switch of the utility model;

[0024] Figure 2 It is a circumferential cross-sectional view of the electromagnetic switch of the utility model.

[0025] Description of reference numerals:

[0026] 100, housing assembly, 110, switch housing, 120, switch cover, 130, copper sleeve;

[0027] 200, moving iron core assembly, 210, pull rod, 220, moving iron core;

[0028] 300, static iron core;

[0029] 400, push rod assembly, 410, sealing bushing, 420, push rod, 430, contact copper plate, 440, return spring, 450, overtravel spring;

[0030] 500, electromagnetic coil;

[0031] 600, plug-in assembly, 610, connector, 620, contact bolt. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0033] Please also read Figures 1-2 As shown, the utility model provides an airtight electromagnetic switch for a starter, comprising a housing assembly 100 , a moving iron core assembly 200 , a static iron core 300 and a push rod assembly 400 .

[0034] Among them, the moving iron core assembly 200 and the static iron core 300 are coaxially arranged in the inner cavity of the shell assembly 100, the push rod assembly 400 passes through the central cavity of the static iron core 300, one end of the push rod assembly 400 is fixedly connected to the moving iron core assembly 200, and the push rod assembly 400 includes a sealing bushing 410, which is located at one end of the push rod assembly 400 close to the static iron core 300, and the sealing bushing 410 is arranged in the gap between the push rod assembly 400 and the static iron core 300 for sealing.

[0035] By adopting a starter airtight electromagnetic switch provided by the utility model, when the moving iron core assembly 200 and the static iron core 300 are attracted, the air in the sealed compartment of the electromagnetic switch can be compressed, thereby slowing down the air overflow and achieving an airtight effect. Since the sealing is improved, the electromagnetic switch is not easy to get wet, so corrosion can be avoided. On the other hand, the setting of the sealing bushing 410 provides a limiting effect on the swing of the push rod assembly 400, thereby reducing the occurrence of electrical corrosion perforation failure. For the above reasons, the service life of the starter electromagnetic switch provided by the utility model is improved, which can be increased from the current 100,000 times to about 500,000 times.

[0036] At the same time, due to the increase in air tightness, the time for pulling out the starter gear is slowed down, so the electromagnetic switch of the utility model increases the dynamic stroke from 3mm of the ordinary switch to 6mm, effectively solving the scraping phenomenon of the starter.

[0037] In a preferred embodiment, the fitting clearance between the sealing bushing 410 and the static iron core 300 is 0.06-0.13 mm. This is because if the clearance is too large, there will be no airtight effect.

[0038] In a preferred embodiment, the sealing bushing 410 is made of PEEK or PCS material, which can reduce movement wear and increase the service life of the sealing bushing 410.

[0039] In a preferred embodiment, the push rod assembly 400 includes a push rod 420, a sealing bushing 410 and a contact copper plate 430. The push rod 420 is arranged in the central cavity of the static iron core 300, and one end of the push rod 420 is fixedly connected to the moving iron core assembly 200. The sealing bushing 410 is sleeved on one end of the push rod 420 away from the moving iron core assembly 200, and the contact copper plate 430 is fixed on the sealing bushing 410.

[0040] In a preferred embodiment, the sealing bushing 410 is formed with a vertical sealing surface and a horizontal sealing surface for sealing the static iron core 300 , and a mounting surface for mounting the contact copper plate 430 .

[0041] In a preferred embodiment, the push rod assembly 400 also includes a return spring 440 and an overtravel spring 450 , which are sleeved on the outside of the push rod 420 , and one end of the overtravel spring 450 abuts against one end of the sealing sleeve 410 .

[0042] In a preferred embodiment, the moving iron core assembly 200 includes a pull rod 210 and a moving iron core 220, one end of the pull rod 210 is arranged in the central cavity of the moving iron core 220, the other end of the pull rod 210 is retained outside the moving iron core 220, and the end of the moving iron core 220 away from the pull rod 210 is connected to the push rod 420.

[0043] In a preferred embodiment, the housing assembly 100 includes a switch housing 110, a switch cover 120 and a copper sleeve 130. The switch housing 110 is snap-fitted to one end of the switch cover 120. The copper sleeve 130 is disposed in the inner cavity of the switch housing 110. The moving iron core assembly 200, the static iron core 300 and the push rod assembly 400 are all disposed inside the copper sleeve 130.

[0044] In a preferred embodiment, a protrusion is formed at the corner where the static iron core 300 is connected to the copper sleeve 130, and the static iron core 300 and the copper sleeve 130 are interference fit through the protrusion. In this way, the connection between the static iron core 300 and the copper sleeve 130 can be strengthened, making it difficult for the static iron core 300 to fall off. Previously, the static iron core 300 was clearance fit with the copper sleeve 130, which also improved the verticality of the static iron core 300 and the copper sleeve 130.

[0045] In a preferred embodiment, the protrusion is arranged at a 2 mm section at the root of the static iron core 300, and the interference fit is 0.1 mm. This is because if the interference fit section is too long, it will cause assembly difficulties.

[0046] In a preferred embodiment, the electromagnetic switch further includes an electromagnetic coil 500 , and the electromagnetic coil 500 is arranged in a space formed between the copper sleeve 130 and the switch housing 110 .

[0047] In a preferred embodiment, the electromagnetic switch further includes a plug-in assembly 600 , which includes a connector 610 and contact bolts 620 . The connector 610 is fixed to the switch cover 120 , and the contact bolts 620 are fixed to the switch cover 120 on both sides of the connector 610 .

[0048] The working principle of a starter airtight electromagnetic switch provided by the utility model is as follows:

[0049] The sealing bushing 410, the overtravel spring 450 and the contact copper plate 430 are fixedly assembled on the push rod 420. When the automobile ignition key is turned on, the electromagnetic coil 500 is energized to generate suction, and the sealing bushing 410, the overtravel spring 450 and the contact copper plate 430 move upward. The contact points of the contact copper plate 430 and the two contact bolts 620 are connected to make the starter energized and rotate; when the ignition key is turned off, the magnetic flux of the electromagnetic coil 500 disappears, and the contact copper plate 430 is separated from the contact bolt 620 due to the action of the return spring 440, and the sealing bushing 410, the overtravel spring 450 and the contact copper plate 430 move downward, and the starter stops working. In this process, the sealing bushing 410 moves up and down with the electromagnetic switch being attracted and returned, so that the air in the sealed cabin is compressed to play a sealing role, thereby increasing the service life of the electromagnetic switch.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A starter airtight electromagnetic switch, characterized in that: include: Shell assembly; A moving iron core assembly and a stationary iron core, wherein the moving iron core assembly and the stationary iron core are coaxially arranged in the inner cavity of the housing assembly; A push rod assembly, wherein the push rod assembly passes through the central cavity of the static iron core, and one end of the push rod assembly is fixedly connected to the moving iron core assembly; and A sealing bushing is located at one end of the push rod assembly close to the static iron core, and the sealing bushing is arranged in the gap between the push rod assembly and the static iron core for sealing.

2. The starter airtight electromagnetic switch according to claim 1, characterized in that: The matching clearance between the sealing bushing and the static iron core is 0.06-0.13 mm.

3. The starter airtight electromagnetic switch according to claim 1, characterized in that: The push rod assembly includes a push rod and a contact copper plate. The push rod is arranged in the central cavity of the static iron core, and one end of the push rod is fixedly connected to the moving iron core assembly. The sealing bushing is sleeved on one end of the push rod away from the moving iron core assembly, and the contact copper plate is fixed on the sealing bushing.

4. The starter airtight electromagnetic switch according to claim 3, characterized in that: The sealing bushing is formed with a vertical sealing surface and a horizontal sealing surface for sealing the static iron core, and a mounting surface for mounting the contact copper plate.

5. The starter airtight electromagnetic switch according to claim 3, characterized in that: The push rod assembly also includes a return spring and an overtravel spring, wherein the return spring and the overtravel spring are sleeved outside the push rod, and one end of the overtravel spring abuts against one end of the sealing bushing.

6. The starter airtight electromagnetic switch according to claim 1, characterized in that: The moving iron core assembly includes a pull rod and a moving iron core, one end of the pull rod is arranged in the central cavity of the moving iron core, the other end of the pull rod is retained outside the moving iron core, and the end of the moving iron core away from the pull rod is connected to the push rod assembly.

7. The starter airtight electromagnetic switch according to claim 1, characterized in that: The housing assembly includes a switch shell, a switch cover and a copper sleeve. The switch shell is buckled and connected to one end of the switch cover. The copper sleeve is arranged in the inner cavity of the switch shell. The moving iron core assembly, the static iron core and the push rod assembly are all arranged inside the copper sleeve.

8. The starter airtight electromagnetic switch according to claim 7, characterized in that: A protrusion is formed at the corner where the static iron core is connected to the copper sleeve, and the static iron core and the copper sleeve are interference-fitted through the protrusion.

9. The starter airtight electromagnetic switch according to claim 7, characterized in that: The electromagnetic switch further includes an electromagnetic coil disposed in a space formed between the copper sleeve and the switch housing.

10. The starter airtight electromagnetic switch according to claim 7, characterized in that: The electromagnetic switch further comprises a plug-in assembly, which comprises a plug-in connector and contact bolts. The plug-in connector is fixed on the switch cover, and the contact bolts are fixed on the switch cover at both sides of the plug-in connector.

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