Electromagnetic switch of starter

Abstract

The utility model discloses an electromagnetic switch of a starter, which belongs to the technical field of electromagnetic switches and comprises a coil assembly, a movable iron core, a mandrel and a movable contact piece which are mounted in a support cover and a machine body, and a heat-conducting fin is mounted in the support cover and comprises a bottom plate and an arc-shaped side plate vertically connected with the bottom plate. The bending radian of the arc-shaped side plate is consistent with the bending radian of the circumferential inner wall of the supporting cover, the storage battery terminal penetrates through the mounting hole of the bottom plate to press the bottom plate on the end face of the supporting cover, and the arc-shaped side plate is tightly attached to the inner wall of the supporting cover to extend. The designed heat-conducting fin is large in heat-conducting area, high in cooling speed and lower than the ambient temperature, so that hot moisture in the switch is more easily gathered on the heat-conducting fin, the two static contact terminals are less in water vapor condensation amount and not easy to form an ice layer, the heat-conducting fin does not interfere with closing of the movable contact and the static contact terminals, the overall structure of the electromagnetic switch is not obviously changed, and the service life of the electromagnetic switch is prolonged. And the cost is relatively low.

Description

Technical Field

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

[0002] The electromagnetic switch on the starter operates on the principle that the coil assembly inside the electromagnetic switch body is energized to generate electromagnetic force, thereby moving the moving iron core, driving the transmission engagement mechanism to advance the starter drive gear and engage with the engine flywheel ring gear. Subsequently, the moving contact piece contacts the end face of the stationary contact terminal to achieve conduction of the switch contacts, allowing the starter motor to be energized and rotate, thereby starting the engine.

[0003] For electromagnetic switches of common structures, in an extremely low temperature, cold and humid environment, when the engine stops after working for a long time, the temperature of the entire engine is high, and the starter is close to the engine. The heat is transferred to the starter electromagnetic switch, and the temperature of the electromagnetic switch rises. During the normal operation of the starter, the electromagnetic switch runs under load and generates heat inside. At this time, the outside of the electromagnetic switch is cold and humid, and the heat inside the electromagnetic switch is high. The components are baked at high temperature due to moisture, which easily generates water vapor in the support cover cavity. The metal static contact terminal conducts heat quickly, and after the end face of the static contact terminal conducts heat, the temperature is low, which easily condenses water vapor. The temperature continues to drop to form an ice layer, which will prevent the static contact terminal from contacting the moving contact piece, causing the starter motor to fail to operate normally. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a starter electromagnetic switch, which ensures that in a low-temperature and humid environment, an ice layer is not easily formed on the surface of the static contact terminal, and the moving contact piece can be smoothly connected when in contact with the static contact terminal.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A starter electromagnetic switch comprises a coil assembly, a moving iron core, a core shaft and a moving contact piece installed in a support cover and a body, the support cover is provided with a battery terminal, a motor terminal and a coil power supply terminal, a heat conductive sheet is installed in the support cover, the heat conductive sheet comprises a bottom plate and an arc-shaped side plate vertically connected to the bottom plate, the curvature of the arc-shaped side plate is consistent with the curvature of the circumferential inner wall of the support cover, the battery terminal passes through the mounting hole of the bottom plate to press the bottom plate onto the end face of the support cover, and the arc-shaped side plate extends in close contact with the inner wall of the support cover.

[0007] Furthermore, the arc-shaped side plate is arranged between the battery terminal and the inner wall of the support cover, and the surface contact area of ​​the arc-shaped side plate is 1.5 to 2 times the end surface area of ​​the battery terminal.

[0008] Furthermore, the head end of the arc-shaped side plate is arranged between the battery terminal and the inner wall of the support cover, and the tail end extends to one side of the motor terminal. The surface contact area of ​​the arc-shaped side plate is 3 to 5 times the end surface area of ​​the battery terminal.

[0009] Furthermore, the arc-shaped side plate is arranged on a side of the support cover away from the coil power supply terminal, and a positioning platform for fixing the output wire of the coil assembly is provided on the support cover, and the end of the arc-shaped side plate is fixed by the angle between the positioning platform and the inner wall of the support cover.

[0010] Furthermore, an air hole connecting the interior of the support cover with the outside is formed on the end surface of the support cover, and a waterproof and breathable air plug is installed in the air hole.

[0011] Furthermore, the air vent is provided on a side of the end surface of the support cover close to the arc-shaped side plate.

[0012] Furthermore, the air-permeable plug comprises a rubber tube and an air-permeable membrane covering one end of the rubber tube, a convex ring is arranged on the circumference of the rubber tube, and the air-permeable plug is interference-fitted with the air hole.

[0013] Furthermore, the air hole is a stepped hole, and the inner diameter of the stepped hole gradually decreases from an end close to the inner side of the support cover to an end close to the outer side of the support cover. The air plug is installed at the part with the largest inner diameter of the stepped hole. The air plug is arranged with one end of the air permeable membrane facing the outer side of the support cover, and the stepped surface close to the air permeable membrane avoids the air permeable membrane.

[0014] Furthermore, a glue injection groove is provided on the peripheral side of the stepped hole in the support cover, and sealant is injected into the glue injection groove to seal and fix the vent plug to the support cover.

[0015] Furthermore, the heat conducting sheet is a copper sheet or an aluminum sheet.

[0016] After adopting the above technical solution, the beneficial effects of the utility model are:

[0017] Since the starter electromagnetic switch of the utility model includes a coil assembly, a moving iron core, a core shaft, and a moving contact piece installed in a support cover and a body, a battery terminal, a motor terminal, and a coil power supply terminal are arranged on the support cover, a heat conductive sheet is installed in the support cover, and the heat conductive sheet includes a bottom plate and an arc-shaped side plate vertically connected to the bottom plate, and the curvature of the arc-shaped side plate is consistent with the curvature of the circumferential inner wall of the support cover, the battery terminal passes through the mounting hole of the bottom plate to press the bottom plate onto the end face of the support cover, and the arc-shaped side plate is closely attached to the inner wall of the support cover and extends, the design makes full use of the internal structure to increase the heat conduction The contact area between the plate and the air in the support cover cavity is large. In a low temperature environment, the temperature of the battery terminal is quickly transferred to the thermal conductive plate. The thermal conductive plate has a large heat conduction area, a fast cooling speed, and is lower than the ambient temperature. The hot and humid air inside the switch is more likely to accumulate on the thermal conductive plate. The two static contact terminals have less water vapor condensation and are not easy to form an ice layer. When the moving contact piece contacts the static contact terminal, it can be smoothly conductive. This application makes full use of the internal structure for layout, and will not interfere with the closure of the moving contact piece and the static contact terminal. The overall structure of the electromagnetic switch has no obvious change, the cost is relatively low, the structure is simple, and it is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the electromagnetic switch of the starter of the utility model;

[0019] Figure 2 It is a schematic structural diagram of a first embodiment of a thermal conductive sheet;

[0020] Figure 3 yes Figure 2 Schematic diagram of the assembly of the middle heat conducting sheet;

[0021] Figure 4 is a schematic structural diagram of a second embodiment of a heat conducting sheet;

[0022] Figure 5 yes Figure 4 Schematic diagram of the assembly of the middle heat conducting sheet;

[0023] Figure 6 1 is a schematic diagram of the inner structure of the support cover;

[0024] Figure 7 It is a schematic diagram of the structure of the vent plug;

[0025] Figure 8 yes Figure 6 A schematic cross-sectional structure diagram of ;

[0026] In the figure, 1-support cover, 11-battery terminal, 12-motor terminal, 13-positioning platform, 14-coil power supply terminal, 2-heat conductive sheet, 21-bottom plate, 22-arc side plate, 3-air vent, 31-glue injection groove, 4-air plug, 41-rubber tube, 42-convex ring, 43-breathable membrane, 5-body, 51-coil assembly, 6-moving iron core, 61-pull rod, 62-support spring, 7-core shaft, 71-overtravel spring, 72-moving contact piece, 73-return spring. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0028] like Figure 1 As shown, a starter electromagnetic switch includes a coil assembly 51, a moving iron core 6, a core shaft 7, and a moving contact piece 72 installed in a support cover 1 and a body 5. A battery terminal 11, a motor terminal 12, and a coil power supply terminal 14 are provided on the support cover 1. A return spring 73 is provided on the core shaft 7 on the left side of the static contact terminal (battery terminal 11, motor terminal 12). The moving contact piece 72 is sleeved on the core shaft 7 on the left side of the return spring 73. An overtravel spring 71 is connected to the left side of the moving contact piece 72. The coil assembly 51 is covered by the body 5. The support spring 62 is sleeved on the core shaft 7 and contacts with the moving iron core 6. The end of the moving iron core 6 is fixed to the pull rod 61.

[0029] like Figures 1 to 5 As shown together, a heat conducting sheet 2 is installed in the support cover 1, and the heat conducting sheet 2 includes a bottom plate 21 and an arc-shaped side plate 22 vertically connected to the bottom plate 21, and the curvature of the arc-shaped side plate 22 is consistent with the curvature of the circumferential inner wall of the support cover 1. The battery terminal 11 passes through the mounting hole of the bottom plate 21 to press the bottom plate 21 onto the end face of the support cover 1, and the arc-shaped side plate 22 extends closely to the inner wall of the support cover 1.

[0030] Preferably, the heat conducting sheet 2 may be a copper sheet or an aluminum sheet. The heat conducting sheet 2 may also be made of other materials with high thermal conductivity, and has strong thermal conductivity. The heat conducting sheet 2 uses heat conduction to quickly transfer the temperature of the battery terminal 11 to itself, so that its own temperature is basically consistent with the contact surface temperature of the battery terminal 11, effectively contacting the water vapor in the air and reducing the formation of ice on the terminal surface.

[0031] In this application, the internal structure of the support cover 1 is fully utilized for the arrangement. The arc-shaped side plate 22 has a larger heat dissipation area as the heat conductive sheet 2 and is not in close contact with the terminal, which effectively condenses water vapor in the air onto the surface of the heat conductive sheet 2. The amount of water vapor condensed on the two static contact terminals is small, thereby reducing the formation of ice on the terminal surface. The heat conductive sheet 2 has no effect on the contact closure before and after freezing. At the same time, the space inside the cavity of the electromagnetic switch support cover 1 is utilized, and the arc-shaped side plate 22 is close to the inner wall in the inner cavity of the support cover 1, which will not interfere with the closure of the moving contact sheet 72 and the static contact terminal. The overall structure of the electromagnetic switch of this design has no obvious changes, the cost is relatively low, the structure is simple, and it is safe and reliable.

[0032] like Figure 2 and Figure 3 As shown together, specifically, the arc-shaped side plate 22 is arranged between the battery terminal 11 and the inner wall of the support cover 1, and the surface contact area of ​​the arc-shaped side plate 22 is 1.5 times the end surface area of ​​the battery terminal 11. The arc-shaped side plate 22 of this structure is the shortest, and the arc-shaped side plate 22 occupies about one sixth of the inner wall of the electromagnetic switch support cover 1.

[0033] like Figure 4 and Figure 5 As shown together, specifically, the arc-shaped side plate 22 can also be arranged with its head end between the battery terminal 11 and the inner wall of the support cover 1, and its tail end extending to one side of the motor terminal 12, and the surface contact area of ​​the arc-shaped side plate 22 is 4 times the end surface area of ​​the battery terminal 11. The arc-shaped side plate 22 of this structure is the longest, and the arc-shaped side plate 22 occupies about half of the inner wall of the electromagnetic switch support cover 1.

[0034] The specific length of the arc-shaped side plate 22 can also be selected according to the different ambient temperatures, but the material cost of the electromagnetic switch should be reduced as much as possible while meeting the use requirements. In the following embodiments, the longest arc-shaped side plate 22 is used as an example for description.

[0035] like Figure 5 As shown, the arc-shaped side plate 22 is arranged on the side of the support cover 1 away from the coil power supply terminal 14, and the support cover 1 is provided with a positioning platform 13 for fixing the outlet wire of the coil assembly 51, and the end of the arc-shaped side plate 22 is fixed by the angle between the positioning platform 13 and the inner wall of the support cover 1. The angle structure between the positioning platform 13 and the inner wall of the support cover 1 can effectively limit the end of the arc-shaped side plate 22, so as to prevent the vibration of the arc-shaped side plate 22 from causing the fastening device of the battery terminal 11 to loosen.

[0036] like Figure 6As shown, the end surface of the support cover 1 is provided with an air hole 3 connecting the inside of the support cover 1 with the outside, and a waterproof and breathable air plug 4 is installed in the air hole 3. The air plug 4 has the function of being waterproof and breathable. On the one hand, it can ensure that the electromagnetic switch is waterproof and breathable, no water enters the inside, and no parts are corroded; on the other hand, it realizes the exchange of air between the inner cavity of the electromagnetic switch support cover 1 and the outside, and the temperature inside the electromagnetic switch and the outside environment are balanced, so that the temperature difference between the static contact terminal and other positions in the inner cavity of the support cover 1 is small, thereby reducing the condensation of water vapor on the end surface of the static contact terminal and reducing the ice layer.

[0037] Preferably, the air vent 3 is opened on one side of the end surface of the support cover 1 near the arc-shaped side plate 22. Since the heat conductive sheet 2 is closer to the air plug 4 than the battery terminal 11, when the air plug 4 is ventilated to dissipate heat, the temperature of the heat conductive sheet 2 is lower than the surface of the battery terminal 11, so that the ice layer quickly condenses near the air plug 4, thereby greatly reducing the ice layer on the surface of the battery terminal 11 and the motor terminal 12.

[0038] like Figure 7 As shown, the air plug 4 includes a rubber tube 41 and a breathable membrane 43 covering one end of the rubber tube 41. The rubber tube 41 is made of silicone rubber, which is resistant to high temperature and corrosion. The breathable membrane 43 is made of polypropylene and textile materials, which are breathable, water-repellent and corrosion-resistant.

[0039] Preferably, a plurality of convex rings 42 are provided on the circumferential surface of the rubber tube 41, and the air plug 4 is interference fit with the air hole 3. The convex rings 42 play a supporting role, which can enhance the fixing effect of the air plug 4 and prevent the air plug 4 from falling off.

[0040] like Figure 8 As shown, the vent hole 3 is a stepped hole, and the inner diameter of the stepped hole gradually decreases from the end close to the inner side of the support cover 1 to the end close to the outer side of the support cover 1, and the vent plug 4 is installed at the part with the largest inner diameter of the stepped hole. The end of the vent plug 4 provided with the vent membrane 43 is arranged toward the outer side of the support cover 1, and the stepped surface close to the vent membrane 43 forms a avoidance with the vent membrane 43, that is, the aperture of the part adjacent to the vent plug 4 in the axial direction of the stepped hole is greater than or equal to the diameter of the vent membrane 43, ensuring that the vent membrane 4 can fully contact with the outside.

[0041] To further improve the fixing effect, a glue injection groove 31 is opened around the stepped hole in the support cover 1. Sealant is injected into the glue injection groove 31 to seal and fix the vent plug 4 and the support cover 1. The glue coating position is far away from the breathable membrane 43 to prevent the sealant from overflowing onto the breathable membrane 43 and affecting the breathability.

[0042] The starter electromagnetic switch of the utility model installs a heat conducting sheet in the support cover and arranges an arc-shaped side plate on the heat conducting sheet. In a low temperature environment, the temperature of the battery terminal is quickly transferred to the heat conducting sheet. The heat conducting sheet has a large area and cools down quickly. It is lower than the ambient temperature. The hot moisture inside the switch is more likely to gather on the heat conducting sheet. The two static contact terminals have less water vapor condensation and are not easy to form an ice layer. The arc-shaped side plate is tightly attached to the inner wall of the support cover and extends, and will not interfere with the closure of the moving contact sheet and the static contact terminal. The cost is relatively low, the structure is simple, and it is safe and reliable.

[0043] In the description of this specification, unless otherwise clearly defined, words such as "setting", "installation", and "connection" should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above words in this utility model based on the specific content of the technical solution.

[0044] Although the specific implementation methods of the utility model are described above, those skilled in the art should understand that the described embodiments are only part of the implementation methods of the utility model, rather than all the implementation methods, which are only examples, and the protection scope of the utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these implementation methods without departing from the principle and essence of the utility model and without any creative work, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A starter electromagnetic switch, comprising a coil assembly (51), a moving iron core (6), a core shaft (7), and a moving contact piece (72) installed in a support cover (1) and a body (5), wherein a battery terminal (11), a motor terminal (12), and a coil power supply terminal (14) are arranged on the support cover (1), characterized in that: A heat conducting sheet (2) is installed in the support cover (1), and the heat conducting sheet (2) comprises a bottom plate (21) and an arc-shaped side plate (22) vertically connected to the bottom plate (21), the curvature of the arc-shaped side plate (22) is consistent with the curvature of the circumferential inner wall of the support cover (1), the battery terminal (11) passes through the mounting hole of the bottom plate (21) to press the bottom plate (21) onto the end surface of the support cover (1), and the arc-shaped side plate (22) extends in close contact with the inner wall of the support cover (1).

2. The starter electromagnetic switch according to claim 1, characterized in that: The arc-shaped side plate (22) is arranged between the battery terminal (11) and the inner wall of the support cover (1), and the surface contact area of ​​the arc-shaped side plate (22) is 1.5 to 2 times the end surface area of ​​the battery terminal (11).

3. The starter electromagnetic switch according to claim 1, characterized in that: The head end of the arc-shaped side plate (22) is arranged between the battery terminal (11) and the inner wall of the support cover (1), and the tail end extends to one side of the motor terminal (12). The surface contact area of ​​the arc-shaped side plate (22) is 3 to 5 times the end surface area of ​​the battery terminal (11).

4. The starter electromagnetic switch according to claim 3, characterized in that: The arc-shaped side plate (22) is arranged on a side of the support cover (1) away from the coil power supply terminal (14); a positioning platform (13) for fixing the output wire of the coil assembly (51) is arranged on the support cover (1); and the end of the arc-shaped side plate (22) is fixed by the angle between the positioning platform (13) and the inner wall of the support cover (1).

5. The starter electromagnetic switch according to claim 1, characterized in that: An air vent (3) is provided on the end surface of the support cover (1) for connecting the interior of the support cover (1) with the outside, and a waterproof and breathable air vent plug (4) is installed in the air vent (3).

6. The starter electromagnetic switch according to claim 5, characterized in that: The air vent (3) is formed on a side of the end surface of the support cover (1) close to the arc-shaped side plate (22).

7. The starter electromagnetic switch according to claim 5, characterized in that: The vent plug (4) comprises a rubber tube (41) and a vent membrane (43) covering one end of the rubber tube (41). A convex ring (42) is provided on the circumference of the rubber tube (41). The vent plug (4) is interference fit with the vent hole (3).

8. The starter electromagnetic switch according to claim 7, characterized in that: The vent hole (3) is a stepped hole, the inner diameter of which gradually decreases from an end close to the inner side of the support cover (1) to an end close to the outer side of the support cover (1), the vent plug (4) is installed at the position where the inner diameter of the stepped hole is the largest, the end of the vent plug (4) on which the vent membrane (43) is arranged is arranged toward the outer side of the support cover (1), and the stepped surface close to the vent membrane (43) is avoided by the vent membrane (43).

9. The starter electromagnetic switch according to claim 8, characterized in that: A glue injection groove (31) is provided on the peripheral side of the stepped hole in the support cover (1), and sealant is injected into the glue injection groove (31) to seal and fix the vent plug (4) and the support cover (1).

10. The starter electromagnetic switch according to any one of claims 1 to 9, characterized in that: The heat conducting sheet (2) is a copper sheet or an aluminum sheet.

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