Electromagnetic switch capable of reducing meshing speed of isolator

Abstract

The utility model discloses an electromagnetic switch for reducing the meshing speed of an isolator, and aims to solve the problem of gear milling abrasion caused by overhigh speed and overlarge torque when the isolator is meshed with a flywheel. Comprising a shell, a circuit board, a coil framework, a pull-in winding and a movable iron core, a nickel-chromium alloy wire is attached to the outer surface of the pull-in winding in a wavy mode so as to temporarily increase resistance and reduce initial electromagnetic force; the movable iron core is arranged in an elastic floating mode through a limiting base, a limiting cover and a plurality of sets of springs (the first / second reset spring, the first / second stable spring and the retraction spring), opposite force is buffered, and slow meshing is achieved. Through cooperation of electromagnetic force control and mechanical buffering, gear milling is avoided, and the reliability of the starter is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile starter electromagnetic switch, concretely relates to a kind of electromagnetic switch of reducing the engagement speed of one-way device, for solving the problem of gear milling abrasion caused by the speed too fast, torque too large when one-way device and engine flywheel engagement. BACKGROUND

[0002] Automobile starter is driven one-way device and flywheel engagement by electromagnetic switch, and then drive engine start. The existing electromagnetic switch has the following defects: one-way device and flywheel engagement speed too fast, torque too large, easy to cause gear milling abrasion even fracture due to impact, reduce starter reliability. Therefore, it is urgent to design a kind of electromagnetic switch that can reduce engagement speed and realize slow engagement. SUMMARY

[0003] To solve the above problems, the utility model aims at providing a kind of electromagnetic switch of reducing the engagement speed of one-way device, by reducing the speed and torque when one-way device engagement, avoid gear milling abrasion, improve starter work reliability.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of electromagnetic switch of reducing the engagement speed of one-way device, including shell, line board, coil framework, suction winding group and moving iron core are arranged in shell;Suction winding group is wound on coil framework, and suction winding group is electrically connected with line board;Moving iron core slides along the middle hole of limiting framework, and shell is equipped with the terminal stud connected with line board, and terminal stud is connected with coil by nickel-chromium alloy wire, and nickel-chromium alloy wire is wave-shaped and attached to the outer surface of suction winding group;

[0005] The moving iron core is elastically and floatingly arranged, and the specific structure is as follows: a limiting base is arranged in the shell, a limiting cover is arranged on the outer wall of the shell, and the moving iron core is limited between the limiting cover and the limiting base; one end of the coil framework is connected with the limiting base, an installation groove is arranged on the moving iron core hole towards the limiting base, a reset push rod with a "T" shaped cross section is arranged in the installation groove, a limiting baffle is arranged at the tail end of the limiting base, and the reset push rod passes through the limiting base and the limiting baffle; a spring seat is arranged between the limiting baffle and the limiting base, a sheath is sleeved on the reset push rod (inserted into the limiting base hole), a first reset spring is arranged between the sheath and the spring seat; a step is arranged on the sheath wall, and a second reset spring is arranged between the step and the limiting base; a first guide hole is arranged on the limiting cover, a guide limiting cap connected with the end surface of the moving iron core is arranged in the guide hole; the guide limiting cap is provided with a second guide hole, a driving cylinder (the open end faces the moving iron core hole, and the closed end is provided with a transmission matching port) is arranged in the second guide hole, and an annular spring step is arranged on the inner wall of the driving cylinder; a transmission shaft sliding along the moving iron core hole is arranged in the moving iron core hole, a first stabilizing spring is arranged between the spring step and one end of the transmission shaft, the other end of the transmission shaft is in contact with the reset push rod; a second stabilizing spring is arranged between the end surface of the reset push rod and the bottom of the installation groove; the outer wall of the open end of the driving cylinder extends to form an annular seat, a retraction spring is arranged between the annular seat and the inner cavity of the limiting cover, so that the driving cylinder always keeps in contact with the moving iron core, and the transmission stability of the driving cylinder and the yoke is ensured.

[0006] The nickel-chromium alloy wire is spirally wound along the axial direction of the suction winding set, and has a continuous wave shape.

[0007] The first reset spring, the second reset spring, the first stabilizing spring, the second stabilizing spring and the retraction spring are all compression springs.

[0008] The sheath is made of insulating material and is in interference fit with the reset push rod.

[0009] The guide limiting cap is connected with the end surface of the moving iron core through press fitting, and the driving cylinder is matched with the guide limiting cap through the second guide hole.

[0010] The utility model discloses the beneficial effect is:

[0011] 1, the wave-shaped nickel-chromium alloy wire on the outer surface of the suction winding set can temporarily increase the resistance, reduce the electromagnetic force in the initial stage of electrification, make the starter output small torque and rotate slowly, ensure that the one-way device and the flywheel are engaged successfully before connecting the large torque, and avoid milling teeth.

[0012] 2, the moving iron core is elastically and floatingly arranged through a plurality of springs (first / second reset spring, first / second stabilizing spring, retraction spring), the reverse force is buffered through the retraction spring, the impact of the moving iron core is reduced, and the transmission stability is improved.

[0013] 3, compact structure, through the electromagnetic force control and mechanical buffer synergistic effect, effectively realize the slow engagement function, improve the reliability of the starter.

[0014] The utility model is further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a perspective view of the specific embodiment of the utility model;

[0016] Figure 2 It is a sectional view of the specific embodiment of the utility model;

[0017] Figure 3 It is Figure 2 It is an enlarged view of A in the figure.

[0018] Markings in the figure: 1 - shell; 2 - circuit board; 3 - coil framework; 4 - suction winding group; 5 - nickel-chromium alloy wire; 6 - moving iron core; 7 - limiting base; 8 - limiting cover; 9 - reset push rod; 10 - limiting baffle; 11 - spring seat; 12 - sheath; 13 - first reset spring; 14 - second reset spring; 15 - guiding limiting cap; 16 - knob; 17 - first stabilizing spring; 18 - transmission shaft; 19 - second stabilizing spring; 20 - retraction spring; 21 - terminal post. DETAILED DESCRIPTION

[0019] The utility model is specifically described below through examples, which is only used for further illustrating the utility model and cannot be understood as limiting the protection scope of the utility model.

[0020] As Figure 1 - Figure 3 The embodiment discloses an electromagnetic switch for reducing the engagement speed of a one-way device, and a circuit board 2, a coil framework 3 and a moving iron core 6 are installed in a shell 1. The coil framework 3 is wound to form a suction winding group 4, and the suction winding group 4 is electrically connected to a terminal post 21 through the circuit board 2; the suction winding group 4 is externally provided with a nickel-chromium alloy wire 5 in a wave shape, and the resistance of the nickel-chromium alloy wire 5 is temporarily increased with temperature, so that the initial electromagnetic force is reduced.

[0021] The moving iron core 6 slides along the limiting framework hole, the limiting base 7 is fixed in the shell 1, the limiting cover 8 is fixed to the outer wall of the shell 1, and the moving iron core 6 is limited between the limiting cover 8 and the limiting base 7. One end of the coil framework 3 is connected to the limiting base 7, a "T" shaped reset push rod 9 is arranged in the mounting groove in the hole of the moving iron core 6, the reset push rod 9 passes through the limiting base 7 and the limiting baffle 10 at the tail end. The spring seat 11 is arranged between the limiting baffle 10 and the limiting base 7, the sheath 12 on the reset push rod 9 is inserted into the hole of the limiting base 7, the first reset spring 13 is arranged between the sheath 12 and the spring seat 11; the second reset spring 14 is arranged between the step of the wall of the sheath 12 and the limiting base 7.

[0022] The first guide hole of the limiting cover 8 is provided with a guide limiting cap 15 connected with the end face of the moving iron core 6 through a press buckle; the second guide hole of the guide limiting cap 15 is provided with a pushing cylinder 16 (the open end faces the hole in the moving iron core 6), the inner wall annular spring step of the pushing cylinder 16 abuts against one end of the first stabilizing spring 17, the other end of the first stabilizing spring 17 abuts against one end of the transmission shaft 18, the other end of the transmission shaft 18 contacts the reset push rod 9; the second stabilizing spring 19 is arranged between the end face of the reset push rod 9 and the bottom of the mounting groove. The annular seat on the outer wall of the open end of the pushing cylinder 16 is provided with a retraction spring 20 between the inner cavity of the limiting cover 8, so as to ensure that the pushing cylinder 16 is always in contact with the moving iron core 6, thereby ensuring that the moving iron core has a certain spring floating during movement.

[0023] During work, the terminal post 21 is electrified, the current flows into the suction winding 4 through the nichrome wire 5 (the initial resistance is high), the electromagnetic force is small, the moving iron core 6 moves slowly, the transmission shaft 18 and the pushing cylinder 16 drive the yoke to push the one-way device, so that the one-way device is engaged with the flywheel at low speed and small torque; after the engagement is completed, the nichrome wire 5 generates heat due to the increase of the current, the resistance is reduced, the electromagnetic force is increased, the moving iron core 6 moves quickly, the pushing cylinder 16 drives the yoke to push the one-way device to completely combine with the flywheel, and the starting is completed. The reverse force is buffered by the retraction spring 20, so as to avoid the impact damage of the moving iron core 6. After the engine is started, the moving iron core is reset under the action of the first and second reset springs.

[0024] After the above technical scheme is adopted, the following technical effects are achieved:

[0025] 1. The wave-shaped nichrome wire on the outer surface of the suction winding can temporarily increase the resistance, reduce the electromagnetic force at the initial stage of electrification, make the starter output small torque and rotate slowly, ensure that the one-way device is successfully engaged with the flywheel before the large torque is connected, and avoid the milling teeth;

[0026] 2. The moving iron core realizes elastic floating through multiple springs (the first / second reset spring, the first / second stabilizing spring and the retraction spring), the reverse force is buffered by the retraction spring, the impact of the moving iron core is reduced, and the transmission stability is improved;

[0027] 3. The structure is compact, the electromagnetic force control and the mechanical buffering are cooperated, the slow engagement function is effectively realized, and the reliability of the starter is improved.

Claims

1. An electromagnetic switch for reducing the engagement speed of a unidirectional device, characterized by: The utility model relates to a kind of electric switch, including shell (1), line board (2) is provided in shell (1), coil former (3), suction winding group (4) and moving iron core (6) are provided in shell (1);Suction winding group (4) is wound on coil former (3), and suction winding group (4) is electrically connected with line board (2);Moving iron core (6) slides along the middle hole of limiting framework, and shell (1) is equipped with terminal stud (21) connected with line board (2), terminal stud (21) is connected with coil by nickel-chromium alloy wire (5), and nickel-chromium alloy wire (5) is arranged in continuous wave shape on the outer surface of suction winding group (4);Moving iron core (6) is elastically floatingly arranged, and dialing cylinder (16) is arranged on moving iron core and keeps contact with it.

2. The electromagnetic switch to reduce the engagement speed of a one-way clutch according to claim 1, characterized by: Limiting base (7) is arranged in shell (1), limiting cover (8) is arranged on the outer wall of shell (1), and moving iron core (6) is limited between limiting cover (8) and limiting base (7);One end of coil former (3) is connected with limiting base (7), and the middle hole of moving iron core (6) is provided with mounting groove towards limiting base (7), reset push rod (9) with the section of "T" is arranged in mounting groove, limiting baffle (10) is arranged at the tail end of limiting base (7), and reset push rod (9) passes through limiting base (7) and limiting baffle (10);Spring seat (11) is arranged between limiting baffle (10) and limiting base (7), and sheath (12) is arranged on reset push rod (9), first reset spring (13) is arranged between sheath (12) and spring seat (11);Step is arranged on the peripheral wall of sheath (12), and second reset spring (14) is arranged between step and limiting base (7);First guide hole is arranged on limiting cover (8), guide limiting cap (15) connected with the end surface of moving iron core (6) is arranged in guide hole;Second guide hole is arranged in guide limiting cap (15), dialing cylinder (16) is arranged in second guide hole, the opening end of dialing cylinder (16) is towards the middle hole of moving iron core (6), the closed end is provided with transmission matching port, and annular spring step is arranged on the inner wall of dialing cylinder (16);Transmission shaft (18) is arranged in the middle hole of moving iron core (6) and slides along it, first stabilizing spring (17) is arranged between spring step and one end of transmission shaft (18), the other end of transmission shaft (18) is in contact with reset push rod (9);Second stabilizing spring (19) is arranged between the end surface of reset push rod (9) and the bottom of mounting groove;The outer wall of the opening end of dialing cylinder (16) is extended to form annular seat, retraction spring (20) is arranged between annular seat and the inner cavity of limiting cover (8), so that dialing cylinder (16) keeps contact with moving iron core (6) at all times.

3. The electromagnetic switch to reduce the engagement speed of a one-way clutch according to claim 1, characterized by: The nickel-chromium alloy wire (5) is spirally wound along the axial direction of the suction winding group (4) and has a continuous wave shape.

4. The electromagnetic switch to reduce the engagement speed of a one-way clutch according to claim 2, characterized by: The first reset spring (13), the second reset spring (14), the first stabilizing spring (17), the second stabilizing spring (19), and the retraction spring (20) are compression springs.

5. The electromagnetic switch to reduce the engagement speed of a one-way clutch according to claim 2, characterized by: The sheath (12) is made of an insulating material and is in interference fit with the reset push rod (9).

6. The electromagnetic switch to reduce the engagement speed of a one-way clutch according to claim 2, characterized by: The guide limiting cap (15) is connected with the end surface of the moving iron core (6) by a press buckle, and the dialing cylinder (16) is in clearance fit with the guide limiting cap (15) through the second guide hole. The sheath (12) is made of an insulating material and is in interference fit with the reset push rod (9).

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