Electric flexible starter and integrated electromagnetic switch and relay thereof

Abstract

The invention discloses an electric flexible starter and an integrated electromagnetic switch and a relay thereof, the electric flexible starter comprises the integrated electromagnetic switch, the integrated electromagnetic switch comprises the relay and the electromagnetic switch which are integrated and coaxially arranged, the magnetic field direction of the integrated electromagnetic switch is the circumferential direction of the relay, and the magnetic field direction of the integrated electromagnetic switch is the axial direction of the electromagnetic switch; the relay comprises a relay stop seat which is asymmetrically provided with a first static contact and a second static contact; the special-shaped movable iron core is a central symmetry structural member and is mounted on the relay stop seat, and movable contact pieces are arranged on the special-shaped movable iron core corresponding to the first static contact and the second static contact respectively; the movable contact pieces are sequentially connected or disconnected with the corresponding first static contact and the second static contact. The annular coil piece is arranged in the relay stop seat corresponding to the special-shaped movable iron core, an annular closed magnetic field is formed by the annular coil piece by controlling the current trend and the coil winding direction, the special-shaped movable iron core circumferentially rotates under the action of the annular closed magnetic field, and the special-shaped movable iron core rotates in the annular closed magnetic field through different closing sequences of the movable contact piece and the corresponding first static contact and the second static contact. And power-off protection is realized.

Description

Technical Field

[0001] The present invention relates to a starter, in particular to an electric flexible starter, an integral electromagnetic switch thereof, and a rotary switch type relay with power-off protection. Background Art

[0002] In the current power system of starters, electromagnetic switches and relay components are basically provided. Their principles are all switches that use energized spiral coils to control the on / off of circuits. However, the electric flexible starter has the following problems:

[0003] 1) Based on the principle of the electric flexible starter, when the main contacts of the electromagnetic switch are disconnected, the pull-in coil and the hold coil need to be powered off simultaneously. It uses Lenz's law to achieve opposite magnetic fields in coils with opposite winding directions (same number of turns and same current), so that the Lenz effects of the coils cancel each other out, meeting the requirement of rapid disconnection of the contacts. However, in actual use, due to external conditions or improper use during the process, the effective number of turns of the energized coils of the pull-in and hold coils is extremely likely to have unequal turns (such as partial coil short circuit caused by overheating). The occurrence of the above problems will directly cause the moving iron core of the electromagnetic switch to still be affected by electromagnetic force and unable to overcome the acting force of the return spring to reset, so that the contacts remain in the closed state, that is, the relay is powered off, but the main contacts of the electromagnetic switch cannot be disconnected. As a result, the starter is energized for a long time, leading to various unpredictable failures and risks such as motor burnout, armature scattering, overrunning clutch ablation, brush wear, and even fire;

[0004] 2) Due to the limitation of the external dimensions of the relay, the external dimensions of its iron core and coil are small, but at the same time, a large stable pulling force is required. Therefore, the pull-in coil of the relay is generally wound with a dense coil, which has a large number of turns and poor heat dissipation, and is extremely likely to generate overheating during use.

[0005] Due to the special structure of the electric flexible starter, the electromagnetic switch and the relay generally have the following characteristics:

[0006] 1) The electromagnetic switch has 2 coils (pull-in coil and hold coil). Among them, the pull-in coil has a small resistance and the hold coil has a large resistance. However, the number of turns of the above coils is equal, and one end of the two coils remains connected. Since the electromagnetic switch needs to provide an outward output force to the starter drive mechanism through mechanisms such as a shift fork at the same time, its number of turns is large. Therefore, there is a contradiction between the requirements of large current and low temperature rise for the coils of the electromagnetic switch;

[0007] 2) The relay has 1 coil (pull-in coil), and its coil resistance value is large. Since the relay does not need to consider the requirement of external output force, its external dimensions are generally small, and the size of its internal moving iron core (core shaft) is affected by the external dimensions and is generally small. Therefore, on the premise of maintaining the contact closing force, the number of turns of the pull-in coil of the relay is extremely large;

[0008] 3) The relay is the first - order switch that controls the operation and stop of the entire starter. The opening and closing of the main contacts of the relay will cause related actions of the subsequent electromagnetic switch. Currently, both the relay and the electromagnetic switch use the axial - movement contact method to control the closing and separation of the contacts. To achieve the purpose of using a smaller control current, it is required that the pull - in coil resistance of the relay is relatively high and the number of turns is relatively large. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide an electric flexible starter, an integrated electromagnetic switch and a relay for the above - mentioned defects of the prior art.

[0010] To achieve the above object, the present invention provides a relay, which includes:

[0011] A relay stop seat, on which a first static contact and a second static contact are asymmetrically arranged;

[0012] A special - shaped moving iron core, which is installed on the relay stop seat. The special - shaped moving iron core is respectively provided with moving contact pieces corresponding to the first static contact and the second static contact; the special - shaped moving iron core is a centrosymmetric structural member, and the moving contact pieces are sequentially closed or disconnected from the corresponding first static contact and second static contact; and

[0013] An annular coil member, which is arranged in the relay stop seat corresponding to the special - shaped moving iron core. By controlling the current direction and the coil winding direction, the annular coil member forms an annular closed magnetic field. The special - shaped moving iron core rotates circumferentially under the action of the annular closed magnetic field, and the power - off protection is realized by different closing sequences of the moving contact pieces with the corresponding first static contact and second static contact.

[0014] The above - mentioned relay, wherein the special - shaped moving iron core includes:

[0015] An iron core body, which is in a circular - ring structure;

[0016] Straight arms, which are symmetrically arranged on the outer wall of the iron core body; the ends of the straight arms are respectively installed with the moving contact pieces;

[0017] Arc - shaped bent arms, which are respectively arranged on the straight arms. The straight arms, the arc - shaped bent arms and the moving contact pieces are all centrosymmetric structures with the axis of the iron core body as the center of symmetry; and

[0018] Arc - shaped iron cores, which are arranged on the arc - shaped bent arms.

[0019] The above - mentioned relay, wherein a cylindrical boss is arranged at the end of the straight arm, a super - travel spring is sleeved on the cylindrical boss, the moving contact piece is installed at the top of the cylindrical boss, and the two ends of the super - travel spring respectively abut against the moving contact piece and the straight arm.

[0020] The above-mentioned relay, wherein the iron core body, the straight arm and the arc-shaped bent arm are integrally formed high-temperature resistant engineering plastic injection molded parts, and the arc-shaped iron core is embedded in the arc-shaped bent arm and is arranged near the end of the arc-shaped bent arm.

[0021] The above-mentioned relay, wherein a roller bearing or a needle bearing is caulked on the inner wall of the circular ring of the iron core body, and a circular ring protrusion adapted to the roller bearing or the needle bearing is arranged on the relay stop seat to ensure the smooth rotation of the special-shaped moving iron core relative to the relay stop seat.

[0022] The above-mentioned relay, wherein the annular coil part includes two groups of annular coils and connection pieces arranged symmetrically. Each group of the annular coils includes a skeleton and a spiral coil wound on the skeleton, and the two spiral coils are connected in series through the connection piece; the skeleton is adapted to the arc-shaped bent arm.

[0023] The above-mentioned relay, wherein the skeleton includes an arc-shaped plate and a bent pipe, and the connection piece is arranged between the two arc-shaped plates; the bent pipe is installed conformally on the arc-shaped plate, the arc-shaped bent arm is inserted into the bent pipe, and rotates circumferentially in the bent pipe under the action of the annular closed magnetic field.

[0024] The above-mentioned relay, wherein the skeleton is a high-temperature resistant insulating nylon injection molded part.

[0025] The above-mentioned relay, wherein the relay stop seat is a hollow cylindrical structure, the first static contact and the second static contact are arranged on the outer wall of the relay stop seat, and the circumferential angle between the first static contact and the second static contact is less than 180°.

[0026] The above-mentioned relay, wherein a moving iron core return spring is further arranged between the special-shaped moving iron core and the relay stop seat.

[0027] In order to better achieve the above object, the present invention further provides an integrated electromagnetic switch, which includes a relay and an electromagnetic switch integrated into an integrated structure. The relay is the above-mentioned relay, the relay and the electromagnetic switch are coaxially arranged, the magnetic field direction of the relay is circumferential, and the magnetic field direction of the electromagnetic switch is axial.

[0028] The above-mentioned integrated electromagnetic switch, wherein the electromagnetic switch includes a first coil, a second coil and a third static contact. The first coil and the second coil are arranged in the same direction and have the same number of turns but different resistances. The first end of the first coil is connected to the end of the third static contact, and the second end of the first coil is connected to the first end of the second coil; the second end of the second coil is connected to the grounding end of the electromagnetic switch.

[0029] The above-mentioned integrated electromagnetic switch, wherein a first stationary contact of the relay is connected in parallel between a first end of the third stationary contact and a second end of the first coil; a second stationary contact of the relay is connected in series between a second end of the third stationary contact and a first end of the first coil.

[0030] To better achieve the above object, the present invention further provides an electric flexible starter, which includes the above-mentioned integrated electromagnetic switch.

[0031] The technical effects of the present invention are as follows:

[0032] 1) The relay switch adopts a rotary closing method, its axial dimension is reduced, the magnetic field direction is circumferential, and it does not interfere with the axial electromagnetic switch, so the overall dimension of the electromagnetic switch can be reduced;

[0033] 2) The coils are symmetrically distributed in multiple groups, the number of turns of a single coil is small, the electromagnetic force working efficiency is improved, the heat diffusion rate of the coil is increased, and the risk of overheating failure of the coil is reduced; and the stability of contact closing is improved;

[0034] 3) The circuit structure has power-off protection. Based on the control of 2 pairs of asynchronous contacts, under normal closing conditions, its current operation is the same as that of a conventional electric flexible starter circuit; but during the power-off process, if the pull-in coil and the holding coil of the electromagnetic switch are both electromagnetically balanced, there is no difference from a conventional electric flexible starter; if the pull-in coil and the holding coil of the electromagnetic switch are electromagnetically unbalanced due to external conditions, the main contacts of the electromagnetic switch will be forcibly disconnected due to the disconnection of the first terminal and the second terminal, thereby protecting the starter to achieve forced power-off.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention. Description of the Drawings

[0036] Figure 1 Schematic diagram of the structure of an electric flexible starter according to an embodiment of the present invention;

[0037] Figure 2 Schematic diagram of the structure of an integrated electromagnetic switch according to an embodiment of the present invention;

[0038] Figure 3 Schematic diagram of the structure of a relay according to an embodiment of the present invention;

[0039] Figure 4 Exploded view of a relay according to an embodiment of the present invention;

[0040] Figure 5 Schematic diagram of the structure of a relay seat according to an embodiment of the present invention;

[0041] Figure 6Schematic diagram of the special-shaped moving iron core structure according to an embodiment of the present invention;

[0042] Figure 7 Schematic diagram of the annular coil member structure according to an embodiment of the present invention;

[0043] Figure 8 Schematic diagram of the annular coil structure according to an embodiment of the present invention;

[0044] Figure 9 Schematic diagram of the contact closing according to an embodiment of the present invention;

[0045] Figure 10 Schematic diagram of the starter circuit according to an embodiment of the present invention.

[0046] Among them, reference numerals

[0047] 1 Driving end cover

[0048] 2 One-way clutch

[0049] 3 Stator

[0050] 4 Armature

[0051] 5 Planetary gear train

[0052] 6 Integrated electromagnetic switch

[0053] 61 Relay

[0054] 611 Relay stop seat

[0055] 6111 Body

[0056] 6112 Circular ring protrusion

[0057] 612 First static contact

[0058] 6121 First terminal

[0059] 6122 Second terminal

[0060] 613 Second static contact

[0061] 6131 Third terminal

[0062] 6132 Fourth terminal

[0063] 614 Special-shaped moving iron core

[0064] 6141 Iron core body

[0065] 6142 Straight arm

[0066] 6143 Arc bent arm

[0067] 6144 Iron core

[0068] 6145 Moving contact piece

[0069] 6146 cylindrical boss

[0070] 6147 overtravel spring

[0071] 615 annular coil part

[0072] 6151 skeleton

[0073] 6152 arc plate

[0074] 6153 elbow pipe

[0075] 6154 helical coil

[0076] 6155 terminal piece

[0077] 616 moving iron core return spring

[0078] 617 cover plate

[0079] 62 housing

[0080] 63 plunger

[0081] 64 mandrel

[0082] 65 electromagnetic stop seat

[0083] 66 support cover

[0084] 67 switch terminal

[0085] 68 electromagnetic moving contact piece

[0086] 69 pull-in and hold coil

[0087] 691 first coil

[0088] 692 second coil

[0089] 60 third static contact

[0090] 7 shift fork

[0091] 8 drive gear

[0092] 9 drive shaft Specific embodiments

[0093] The structural principle and working principle of the present invention will be specifically described below in conjunction with the accompanying drawings:

[0094] See Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of an electric flexible starter according to an embodiment of the present invention, Figure 2Schematic diagram of the structure of the integrated electromagnetic switch 6 according to an embodiment of the present invention. The electric flexible starter of the present invention includes a drive end cover 1 and a one-way clutch 2, a stator 3, an armature 4, a planetary gear train 5, an integrated electromagnetic switch 6, a fork 7, a drive gear 8 and a drive shaft 9 arranged inside the drive end cover 1. The drive gear 8 is installed at the output end of the drive shaft 9, the one-way clutch 2 is installed on the drive shaft 9, one end of the fork 7 is connected to the drive shaft 9 corresponding to the one-way clutch 2, the integrated electromagnetic switch 6 is arranged corresponding to the other end of the fork 7, the armature 4 is arranged corresponding to the stator 3, and the pivot of the armature 4 is mechanically connected to the drive shaft 9 through the planetary gear train 5. Among them, the integrated electromagnetic switch 6 includes a relay 61 and an electromagnetic switch integrated into an integrated structure. The electromagnetic switch includes a housing 62, a plunger 63, a core shaft 64, an electromagnetic stop seat 65, a support cover 66, a switch terminal 67, an electromagnetic moving contact 68 and a pull-in and hold coil 69. The relay 61 is coaxially arranged with the electromagnetic switch. The relay stop seat 611 is sleeved on the core shaft 64 and is located between the support cover 66 and the electromagnetic stop seat 65. The magnetic field direction of the relay 61 is circumferential with the axis of the core shaft 64 as the center, and the magnetic field direction of the electromagnetic switch is axial along the core shaft 64. Therefore, there is no risk of interference related to the magnetic field and movement. When the control terminal of the relay 61 receives a power control signal, the relay 61 operates and makes the switch terminal 67 on the electromagnetic switch energized. The electromagnetic switch operates. The energized armature 4 winding rotates under the action of the magnetic field established by the stator 3 coil excitation winding, converting electrical energy into mechanical energy. The armature 4 is mechanically connected to the drive shaft 9 and the planetary gear train 5 through the pivot arranged therein. When the armature 4 rotates, it drives the drive gear 8 to engage with the engine ring gear through the planetary gear train 5 and the drive shaft 9 to start the engine. During the process of the contact of the relay 61 and the electromagnetic switch closing and opening, the electromagnetic moving contact 68 and the moving contact 6145 have non-coaxial movement, that is, the electromagnetic moving contact 68 moves axially and the moving contact 6145 moves circumferentially. The composition, structure, mutual positional relationship, connection relationship and functions of other parts of the starter and the electromagnetic switch are all relatively mature prior arts, so they will not be elaborated here. Only the relay 61 of the present invention will be described in detail below.

[0095] See Figures 3 - 5 , Figure 3 Schematic diagram of the structure of the relay 61 according to an embodiment of the present invention, Figure 4 Exploded view of the relay 61 according to an embodiment of the present invention, Figure 5The relay 61 of the present invention comprises: a relay stop 611, on which a first static contact 612 and a second static contact 613 are asymmetrically arranged; a special-shaped moving iron core 614, which is mounted on the relay stop 611, and the special-shaped moving iron core 614 is respectively provided with moving contact pieces 6145 corresponding to the first static contact 612 and the second static contact 613; the special-shaped moving iron core 614 is a centrally symmetrical structural member, and the moving contact pieces 6145 are respectively provided with the first static contact 612 and the second static contact 613. 13 is closed or opened in sequence; and an annular coil part 615 is arranged in the relay stopper 611 corresponding to the special-shaped moving iron core 614, and the annular coil part 615 forms an annular closed magnetic field by controlling the current direction and the coil winding direction, so that the special-shaped moving iron core 614 rotates circumferentially around the axis of the core shaft 64 under the action of the annular closed magnetic field, and the closing sequence of the moving contact piece 6145 and the corresponding first static contact 612 and second static contact 613 is different, so as to realize power-off protection.

[0096] In this embodiment, a moving iron core return spring 616 is also provided between the special-shaped moving iron core 614 and the relay stop seat 611, and a cover plate 617 is also provided, which is buckled on the relay stop seat 611. The cover plate 617 and the relay stop seat 611 together form a self-enclosed accommodation space to protect the special-shaped moving iron core 614, the annular coil 615, the moving iron core return spring 616 and each contact inside. The body 6111 of the relay stop seat 611 is preferably a cylindrical structure, and there is a circular protrusion 6112 in the center of the body 6111. The circular protrusion 6112 is covered with the moving iron core return spring 616 and serves as a support for the needle bearing or roller bearing of the special-shaped moving iron core 614 assembly. The external terminal is pre-buried on the outer circular wall of the relay stop seat 611. The material of the external terminal is preferably brass, and two terminals are in a group, that is, the first terminal 6121 and the second terminal 6122 are in a group as the first static contact 612, and the third terminal 6131 and the fourth terminal 6132 are in a group as the second static contact 613, which respectively form contacts with the moving contact piece 6145 on the special-shaped moving iron core 614. During the rotation of the special-shaped moving iron core 614, the closing and disconnection are formed, and there are differences in the order of disconnection and closing. The closing order is: the first terminal 6121 and the second terminal 6122 are closed first, and the third terminal 6131 and the fourth terminal 6132 are closed later; the disconnection order is: the third terminal 6131 and the fourth terminal 6132 are disconnected first, and the first terminal 6121 and the second terminal 6122 are disconnected later.

[0097] See also Figure 6 , Figure 6Schematic diagram of the structure of the special-shaped moving iron core 614 according to an embodiment of the present invention. The special-shaped moving iron core 614 in this embodiment includes: an iron core body 6141, which is in an annular structure; straight arms 6142, symmetrically arranged on the outer wall of the iron core body 6141; moving contact pieces 6145 are respectively installed at the ends of the straight arms 6142; arc-shaped bent arms 6143 are respectively arranged on the straight arms 6142, and the straight arms 6142, arc-shaped bent arms 6143 and moving contact pieces 6145 are all centrosymmetric structures with the axis of the iron core body 6141 as the center of symmetry; and an arc-shaped iron core 6144, which is arranged conformally on the arc-shaped bent arms 6143. Among them, a cylindrical boss 6146 is provided at the end of the straight arm 6142, a super-travel spring 6147 is sleeved on the cylindrical boss 6146, the moving contact piece 6145 is installed at the top of the cylindrical boss 6146, and both ends of the super-travel spring 6147 are respectively abutted against the moving contact piece 6145 and the straight arm 6142.

[0098] In this embodiment, the iron core body 6141, straight arms 6142 and arc-shaped bent arms 6143 are integrally formed high-temperature resistant engineering plastic injection molded parts, and the arc-shaped iron core 6144 is embedded in the arc-shaped bent arms 6143 and is arranged near the end of the arc-shaped bent arms 6143. A roller bearing or needle bearing is press-fitted on the inner ring wall of the iron core body 6141, and a ring-shaped protrusion 6112 adapted to the roller bearing or needle bearing is provided on the relay stop seat 611 to ensure the smooth rotation of the special-shaped moving iron core 614 relative to the relay stop seat 611. That is, the structure of the special-shaped moving iron core 614 is a special-shaped S-shaped structure, and its main body is injection molded from high-temperature resistant engineering plastic; there is an arc-shaped embedded iron core 6144 on the arc-shaped bent arms 6143, and there is a small cylindrical boss 6146 structure at the end of its straight arm 6142. The super-travel spring 6147 is sleeved on the cylindrical boss 6146, and the moving contact piece 6145 is fixed at the upper end of the cylindrical boss 6146. The two contacts formed with the first static contact 612 and the second static contact 613 are asymmetric in space. The contact at one end closes first, and the contact at the other end closes later. During the disconnection process, the disconnection sequence of the contacts is exactly the opposite.

[0099] See Figure 7 and Figure 8 , Figure 7 Schematic diagram of the structure of the annular coil member 615 according to an embodiment of the present invention, Figure 8Schematic diagram of a toroidal coil structure according to an embodiment of the present invention. The toroidal coil member 615 in this embodiment includes two sets of symmetrically arranged toroidal coils and a connection tab 6155. Each set of toroidal coils includes a bobbin 6151 and a helical coil 6154 wound around the bobbin 6151. The two sets of helical coils 6154 are connected in series through the connection tab 6155; the bobbin 6151 is adapted to the arc-shaped bent arm 6143. The bobbin 6151 is preferably a high-temperature resistant insulating nylon injection molded part.

[0100] Wherein, the bobbin 6151 includes an arc plate 6152 and a bent pipe 6153. The connection tab 6155 is arranged between the two sets of arc plates 6152; the bent pipe 6153 is installed on the arc plate 6152 in a conforming manner for fixing the helical coil 6154. The arc plate 6152 is relatively fixed to the relay stop 611 and symmetrically fixed at the bottom of the relay stop 611; the arc-shaped bent arm 6143 passes through the bent pipe 6153 and rotates circumferentially within the bent pipe 6153 under the action of the annular closed magnetic field.

[0101] See Figure 9 , Figure 9 Schematic diagram of contact closure according to an embodiment of the present invention. There are a total of 2 pairs of normally open terminals in this embodiment. The body 6111 of the relay stop 611 is a hollow cylindrical structure. The first static contact 612 and the second static contact 613 are arranged on the outer wall of the relay stop 611. The circumferential angle α1 between the first static contact 612 and the second static contact 613 is less than 180°. The special-shaped moving iron core 614 is a centrosymmetric structure. Therefore, at the moment when the second static contact 613 contacts the corresponding moving contact piece 6145, there is a gap X1 between the first static contact 612 and the corresponding moving contact piece 6145, and the first static contact 612 is not connected at this time. As the special-shaped moving iron core 614 continues to rotate, the contact at the second static contact 613 is maintained, the spring behind its moving contact piece 6145 is compressed, and the first static contact 612 is then conducted. That is, the first static contact 612 and the corresponding moving contact piece 6145 form a first contact, and the second static contact 613 and the corresponding moving contact piece 6145 form a second contact. There is an obvious conduction and disconnection sequence between the second contact and the first contact. When the starter works, the second contact closes before the first contact. After the first and second contacts are both closed, the starter starts to work at full load. When the starter is powered off, the first contact disconnects before the second contact. After the first and second contacts are both disconnected, it can be ensured that the starter is completely powered off.

[0102] The first stationary contact 612 and the second stationary contact 613 of this structure are asymmetrically arranged, and the special-shaped moving iron core 614 adopts a centrosymmetric structure, realizing a clear contact closing sequence during the movement of the special-shaped moving iron core 614. By having different contact closing sequences, the on-off of the coils in the starting motor electromagnetic switch circuit is maintained, thereby avoiding the electromagnetic imbalance problem that occurs in the electric flexible starting motor, ensuring that the entire starting motor is powered off after the relay 61 is de-energized, improving the safety of the starting motor, and eliminating the problem of long-term power-on of the starting motor caused by electromagnetic imbalance.

[0103] See Figure 10 , Figure 10 is a schematic diagram of the starting motor circuit according to an embodiment of the present invention. In this embodiment, the pull-in and hold coils 69 of the electromagnetic switch include a first coil 691 and a second coil 692. A third stationary contact 60, that is, the main contact of the electromagnetic switch, is provided corresponding to the electromagnetic moving contact piece 68. The head end and the tail end of the third stationary contact 60 and the electromagnetic moving contact piece 68 together form a third contact; the first coil 691 and the second coil 692 are arranged in the same direction with the same number of turns but different resistances. The head end of the first coil 691 is connected to the tail end of the third stationary contact 60, and the tail end of the first coil 691 is connected to the head end of the second coil 692; the tail end of the second coil 692 is connected to the grounding end of the electromagnetic switch. Among them, the first stationary contact 612 of the relay 61 is connected in parallel between the head end of the third stationary contact 60 and the tail end of the first coil 691; the second stationary contact 613 of the relay 61 is connected in series between the tail end of the third stationary contact 60 and the head end of the first coil 691. During operation, after the ring-shaped coil member 615 of the relay 61 is energized, the contacts are turned on. After the contacts of the relay 61 are turned on, the pull-in and hold coils 69 of the electromagnetic switch are energized and start to work. The control circuit of the electromagnetic switch is turned on, and the stator 3 and the armature 4 form a series-excited DC motor structure. Under the action of an external current, the armature 4 drives the drive shaft 9 to rotate through the planetary gear train 5. The drive shaft 9 drives the overrunning clutch 2 to rotate through a spline. At the same time, the closing process of the electromagnetic switch drives the fork 7 to rotate, and the overrunning clutch 2 and the drive gear 8 move axially along the drive shaft 9 and are pushed out to engage with the engine flywheel. During the entire working process, the electromagnetic switch and the relay 61 are in a coaxial structure in terms of mechanical structure, but the magnetic field directions are completely different. The main magnetic field of the electromagnetic switch is along the axial direction of the core shaft 64, and the main magnetic field of the relay 61 is circumferential around the core shaft 64. Their corresponding actions are consistent with their main magnetic fields.

[0104] The overall shape of the relay 61 of the present invention is a hollow circular ring structure with a cylindrical through hole in the center, and the circular hole allows the plunger 63 and the core shaft 64 of the electromagnetic switch to move axially; it has a self-contained power-off protection function and adopts a rotating contact closing method, which can save a large size space in the axial direction, and the working magnetic field adopts a toroidal magnetic field structure, which does not interfere with the axial working magnetic field of the electromagnetic switch; the annular coil part 615 adopts a symmetrical spiral coil 6154 structure, and the two spiral coils 6154 are symmetrically distributed in a ring shape, and the coils are connected in series. By controlling the winding direction of the spiral coil 6154 and the direction of the current, the magnetic field generated by the two spiral coils 6154 forms an annular seal Closed, and the moving iron core 6144 is an adaptive circular ring structure, with a pre-embedded ring iron core 6144 inside, which can generate a larger contact closing force in a smaller axial space; the special-shaped moving iron core 614 is made of high-temperature resistant engineering plastic to make a cylindrical skeleton 6151, and its structure is a special-shaped S shape, with a needle bearing installed in the center to facilitate circumferential rotation; the arc iron core 6144 is pre-embedded on the arc bent arm 6143, which can generate electromagnetic force for circumferential rotation under the condition of an annular magnetic field; a moving contact piece 6145 and an overtravel spring 6147 are provided at the end of the skeleton 6151, and the moving contact pieces 6145 at both ends can ensure that the two contacts have an on-off sequence during axial rotation.

[0105] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A relay, characterized in that, it includes: A relay stop seat, on which a first static contact and a second static contact are asymmetrically arranged; A special-shaped moving iron core, installed on the relay stop seat, and moving contact pieces are respectively arranged on the special-shaped moving iron core corresponding to the first static contact and the second static contact; the special-shaped moving iron core is a centrosymmetric structural member, and the moving contact pieces are sequentially closed or disconnected from the corresponding first static contact and second static contact; and A circular coil member, arranged in the relay stop seat corresponding to the special-shaped moving iron core, and by controlling the current direction and the coil winding direction, the circular coil member forms a circular closed magnetic field, and the special-shaped moving iron core rotates circumferentially under the action of the circular closed magnetic field, and the power-off protection is realized by the different closing sequences of the moving contact pieces with the corresponding first static contact and second static contact.

2. The relay according to claim 1, characterized in that, the special-shaped moving iron core includes: An iron core body, which is a circular ring structure; Straight arms, symmetrically arranged on the outer wall of the iron core body; the ends of the straight arms are respectively installed with the moving contact pieces; Arc bent arms, respectively arranged on the straight arms, and the straight arms, arc bent arms and moving contact pieces are all centrosymmetric structures with the axis of the iron core body as the center of symmetry; and An arc-shaped iron core, arranged on the arc bent arms.

3. The relay according to claim 2, characterized in that, A cylindrical boss is arranged at the end of the straight arm, a super-travel spring is sleeved on the cylindrical boss, the moving contact piece is installed at the top of the cylindrical boss, and both ends of the super-travel spring respectively abut against the moving contact piece and the straight arm.

4. The relay according to claim 2, characterized in that, The iron core body, straight arms and arc bent arms are integrally formed injection-molded parts of high-temperature resistant engineering plastics, and the arc-shaped iron core is embedded in the arc bent arms and arranged near the end of the arc bent arms.

5. The relay according to claim 2, characterized in that, Roller bearings or needle bearings are caulked on the inner wall of the circular ring of the iron core body, and circular ring protrusions adapted to the roller bearings or needle bearings are arranged on the relay stop seat to ensure the smooth rotation of the special-shaped moving iron core relative to the relay stop seat.

6. The relay according to claim 2, characterized in that, The circular coil member includes two groups of symmetrically arranged circular coils and connection pieces. Each group of circular coils includes a skeleton and a spiral coil wound on the skeleton, and the two spiral coils are connected in series through the connection pieces; the skeleton is adapted to the arc bent arms.

7. The relay according to claim 6, characterized in that, The skeleton includes an arc plate and a bent pipe, and the connection piece is arranged between the two arc plates; the bent pipe is installed conformally on the arc plate, the arc bent arms are inserted into the bent pipe, and rotate circumferentially in the bent pipe under the action of the circular closed magnetic field.

8. The relay according to claim 7, characterized in that, The skeleton is an injection-molded part of high-temperature resistant insulating nylon.

9. The relay according to claim 1, characterized in that, The relay stop seat is a hollow cylindrical structure. The first static contact and the second static contact are arranged on the outer wall of the relay stop seat, and the circumferential angle between the first static contact and the second static contact is less than 180°.

10. The relay according to claim 1, characterized in that, a moving iron core return spring is further arranged between the special-shaped moving iron core and the relay stop seat.

11. An integrated electromagnetic switch, characterized in that, it includes a relay and an electromagnetic switch integrated into an integrated structure. The relay is the relay according to any one of claims 1-10. The relay and the electromagnetic switch are coaxially arranged. The magnetic field direction of the relay is circumferential, and the magnetic field direction of the electromagnetic switch is axial.

12. The integrated electromagnetic switch according to claim 11, characterized in that, the electromagnetic switch includes a first coil, a second coil and a third static contact. The first coil and the second coil are arranged in the same direction and have the same number of turns but different resistances. The head end of the first coil is connected to the tail end of the third static contact, and the tail end of the first coil is connected to the head end of the second coil; the tail end of the second coil is connected to the grounding end of the electromagnetic switch.

13. The integrated electromagnetic switch according to claim 12, characterized in that, the first static contact of the relay is connected in parallel between the head end of the third static contact and the tail end of the first coil; the second static contact of the relay is connected in series between the tail end of the third static contact and the head end of the first coil.

14. An electric flexible starter, characterized in that, it includes the integrated electromagnetic switch according to any one of claims 11-13.

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