EMB locking mechanism and vehicle

Abstract

The EMB locking mechanism comprises an electromagnet assembly, the electromagnet assembly comprises a busbar and a coil winding support which are connected, and the busbar and the coil winding support are integrally formed in an injection molding mode. According to the EMB locking mechanism, the busbar and the coil winding support are subjected to integral injection molding, so that hard connection is firmer, the connection strength between the electromagnet and the busbar is improved, and the anti-vibration capacity is improved. The invention further discloses a vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of braking systems. Specifically, the present invention relates to an EMB locking mechanism and a vehicle. Background Art

[0002] With the electrification transformation of vehicles, the wire-controlled braking system has gradually become a major development trend in the automotive industry. As one of them, the electro-mechanical braking (EMB) system adopts the form of direct drive by a wheel-end motor. Through a motion conversion mechanism, the torque and rotational motion of the motor are converted into the thrust and translational motion of a connecting member, which pushes the brake pads to clamp the brake disc, thereby obtaining braking force. At the same time, as an emerging braking system, electro-mechanical braking abandons large-volume components such as vacuum boosters and hydraulic pipelines, making the overall vehicle chassis layout simpler, more flexible, and having the advantages of fast and precise pressure regulation speed, which can significantly improve the braking performance of the whole vehicle.

[0003] In the existing technical solutions of EMB brake calipers, the brake caliper structures all have locking mechanisms. One of them is a structure that uses an electromagnet as a locking power device. By the extension and retraction of the locking head of the electromagnet, the power transmission route is locked and unlocked, so as to realize the locking of the entire parking system. Among them, as an electronic component, the electromagnet needs to be connected to the circuit board through a connector to receive and execute the commands of the ECU (Electronic Control Unit). At present, most of the connector solutions adopt male-female end connectors or PIN pin welding, etc. However, based on the current design situation of the electromagnet connector, the layout space and protection requirements are limited, and there may be difficulties in selecting connectors or implementing the welding process. Among the connection methods such as wire harnesses and connectors, the existing problems are as follows:

[0004] 1. In the harsh vibration conditions at the wheel end, the scheme of using connectors and flexible wires may have the risk of vibration damage;

[0005] 2. The assembly of the connector requires space. The connector with waterproof ability is large in volume. The EMB design space is compact and the layout space is small, resulting in limited layout and selection of connectors when using the connector scheme. When using the busbar sub-assembly welding scheme, the welding connection space process operation is limited;

[0006] 3. The protection requirements are high, and additional sealing structures may be required for the connector or welding scheme;

[0007] 4. The flexible wire needs to be positioned and fixed, and positioning and fixing require space, which will cause the EMB to be not compact;

[0008] 5. If the busbar is sub-assembled, process assembly space needs to be reserved, and additional protection structures need to be added. Summary of the Invention

[0009] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an EMB locking mechanism with the aim of improving the connection strength of parts.

[0010] To achieve the above object, the technical solution adopted by the present invention is as follows: an EMB locking mechanism, including an electromagnet assembly, the electromagnet assembly includes a busbar and a coil winding bracket connected to each other, and the busbar and the coil winding bracket are integrally injection-molded.

[0011] Pin pins are injection-molded in the busbar, and the pin pins are connected to the connection terminals of the coil winding arranged on the coil winding bracket. The connection mode between the pin pins and the connection terminals of the coil winding is welding or crimping.

[0012] The leading end of the pin pin is connected to the circuit board, and the connection mode between the two is welding or crimping.

[0013] A sealing ring is arranged on the busbar. The sealing ring is an O-ring and the cross-section of the sealing ring is a circular or square structure.

[0014] The leading end of the pin pin is provided with a bending structure.

[0015] The pin pins are asymmetrically arranged at the end far from the winding coil bracket.

[0016] The busbar is L-shaped, and the end of the L-shaped busbar far from the winding coil bracket is parallel to the winding bracket.

[0017] The electromagnet assembly further includes a position detection element, and the position detection element is located inside the busbar.

[0018] The position detection element is a Hall sensor.

[0019] The electromagnet assembly further includes a coil winding and a permanent magnet, and the coil winding and the permanent magnet are arranged on the coil winding bracket.

[0020] The present invention also provides a vehicle, including the above-mentioned EMB locking mechanism.

[0021] For the EMB locking mechanism of the present invention, the integral injection molding of the busbar and the coil winding bracket makes the hard connection more reliable, increases the connection strength between the electromagnet and the busbar, and improves the anti-vibration ability. Description of the Drawings

[0022] This specification includes the following drawings, and the shown contents are respectively:

[0023] Figure 1 It is an overall structural view of the electromagnet assembly;

[0024] Figure 2It is a sectional view of the electromagnet assembly;

[0025] Figure 3 It is a structural diagram of integrally injection-molded busbar and coil support;

[0026] Figure 4 It is an assembly drawing of winding after integrally injection-molding the busbar and coil support;

[0027] Figure 5 It is a structural diagram of secondary injection molding after winding the support;

[0028] Figure 6 It is a sectional view of MGU;

[0029] Figure 7 It is a schematic diagram of an injection-molded busbar with a Hall sensor;

[0030] Figure 8 It is a sectional view of an injection-molded busbar with a Hall sensor;

[0031] Figure 9 It is an assembly schematic diagram of integrally injection-molding the busbar and coil winding;

[0032] Figure 10 It is a layout schematic diagram of pin pins on the busbar end face;

[0033] The markings in the figure are:

[0034] 1. Electromagnet assembly; 1a. Integrally injection-molded structure of busbar and coil support; 1a1. Busbar; 1a2. Coil winding support; 1a3. Sealing ring; 1a4. Pin pin; 1b. Electromagnet housing; 1c. Electromagnet end cover; 1d. Electromagnet push rod; 1e. Static iron core; 1f. Moving iron core; 1g. Coil winding; 1h. Coil winding; 1i. Static iron core; 1k. Hall sensor; 1m. Permanent magnet; 2. Brushless motor; 3. MGU housing; 3a. Electromagnet cavity; 4. Double gear; 5. ECU housing; 6. Circuit board; 7. ECU cover; 8. Axle pin; 9. Plane. Specific embodiments

[0035] The following is a further detailed description of the specific embodiments of the present invention by describing the embodiments with reference to the accompanying drawings, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitate its implementation.

[0036] As Figures 1 to 6As shown in the figure, the present invention provides an EMB locking mechanism. By the extension and retraction of the locking head of the electromagnet assembly, the motor shaft or gear is locked, thereby realizing the locking function of the EMB system. The EMB locking mechanism includes an electromagnet assembly 1, and the electromagnet assembly 1 includes a busbar 1a1 and a coil winding bracket 1a2 which are connected to each other. The busbar 1a1 and the coil winding bracket 1a2 are integrally injection-molded.

[0037] The present invention proposes a locking mechanism with an integrally injection-molded busbar electromagnet structure. By arranging a locking mechanism on the transmission path, the locking function of the braking system is realized. Specifically, the locking method is that the electromagnet is arranged as a driving device in the cavity of the MGU housing. At the same time, a gear with a locking groove structure is fixed on the MGU housing through a shaft pin. The locking groove is integrated on the double-connected gear. By the extension and retraction of the locking head of the electromagnet, it cooperates with the sector-shaped locking groove on the gear to unlock, so as to realize the locking function of the entire braking system.

[0038] In the present invention, the electromagnet is connected to the circuit board through a busbar, and the busbar and the electromagnet coil bracket are integrally injection-molded. On the one hand, through the integrally injection-molded process, the busbar and the electromagnet are integrated, increasing the connection strength between the busbar and the electromagnet, and at the same time increasing the anti-vibration ability of the busbar connection. On the other hand, by using integral injection molding, the radial space required for the separate connection of the busbar and the electromagnet can be saved, making the design of the electromagnet more compact and maximizing the radial space utilization rate.

[0039] Specifically, as Figure 2 shown, the electromagnet assembly further includes an electromagnet housing 1b, an electromagnet end cover 1c, an electromagnet push rod 1d, two static iron cores 1e and 1i, a moving iron core 1f, and two coil windings 1g and 1h. The electromagnet end cover 1c is fixedly arranged at the top of the electromagnet housing 1b, the static iron core 1i is fixedly arranged on the electromagnet end cover 1c, the static iron core 1e is fixedly arranged at the bottom of the electromagnet housing 1b, the coil windings 1h and 1g are arranged on the coil winding bracket 1a2. At the same time, two annular permanent magnets 1m are also arranged on the coil winding bracket 1a2. The two annular permanent magnets 1m are located between the coil windings 1h and 1g. The integrally injection-molded structure 1a of the busbar and the coil winding bracket is arranged in the electromagnet housing 1b, the busbar 1a1 is located outside the electromagnet housing 1b, the electromagnet end cover 1c and the electromagnet housing 1b are riveted and connected, the static iron core 1i is arranged at the center of the electromagnet end cover 1c, the electromagnet push rod 1d is fixedly connected to the moving iron core 1f, the moving iron core is located between the two static iron cores 1e and 1i, the electromagnet push rod 1d is axially arranged through the two static iron cores, and the sealing ring 1a3 is arranged in the sealing groove provided on the outer circular surface of the busbar 1a1 near the lead-out end of the pin 1a4.

[0040] As Figures 1 to 5As shown, the busbar 1a1 is L-shaped. The busbar 1a1 and the coil winding support 1a2 are arranged axially parallel. The end of the busbar 1a1 away from the winding support 1a2 is parallel to the axis of the coil winding support 1a2, which can shorten the radial space, help reduce the volume of the electromagnet, and facilitate the layout. The busbar 1a1 includes a connected first connection section and a second connection section. One end in the length direction of the first connection section is fixedly connected to the coil winding support 1a2, and the other end in the length direction of the first connection section is fixedly connected to one end in the length direction of the second connection section. The pin 1a4 extends outward from the other end in the length direction of the second connection section. The length direction of the second connection section is parallel to the axis of the coil winding support 1a2, and there is a certain distance between the second connection section and the axis of the coil winding support 1a2.

[0041] As Figure 7 and Figure 8 shown, the electromagnet assembly further includes a position detection element, and the position detection element is located inside the busbar 1a1. The position detection element is a Hall sensor 1k.

[0042] As Figures 1 to 5 shown, the pin 1a4 is injection molded in the busbar 1a1. The pin 1a4 is connected to the joint terminals of the coil windings 1g and 1h provided on the coil winding support 1a2. The connection method between the pin 1a4 and the joint terminals of the coil windings 1g and 1h is welding or crimping. The pin 1a4 is arranged with a radial offset to make full use of the radial space.

[0043] As Figures 1 to 5 shown, the lead-out end of the pin 1a4 is connected to the circuit board, and the connection method between the two is welding or crimping. Moreover, the lead-out end of the pin 1a4 adopts a large chamfer bending structure for buffering with the circuit board. At the same time, the pin 1a4 is arranged with a radial outward offset, and the entire busbar 1a1 is arranged axially parallel to the coil winding support 1a2, making the most of the radial space.

[0044] As Figures 1 to 5 and Figure 10As shown, the pin 1a4 is asymmetrically arranged at one end far from the winding coil bracket 1a2. There are two pin 1a4s. The plane 9 where the lead-out points of the two pin 1a4s are located is parallel to the center line of the bus bar 1a1 (the center line of the bus bar 1a1 is also the axis of the second connection section. The second connection section is a cylinder, and the axis of the second connection section is parallel to the axis of the winding coil bracket 1a2). There is a certain distance between the plane 9 where the lead-out points of the two pin 1a4s are located and the center line of the bus bar 1a1. The pin 1a4 is led out from the end face of the bus bar 1a1. The lead-out point of the pin 1a4 refers to the part where the pin 1a4 intersects the end face of the bus bar 1a1. The lead-out end of the pin 1a4 extends towards the inside of the plane 9. The axis of the winding coil bracket 1a2 is located inside the plane 9. Such an arrangement can ensure that the lead-out end of the pin 1a4 can form a large-angle bend, which can achieve a better buffering effect.

[0045] As Figures 1 to 5 shown, a sealing ring 1a3 is provided on the bus bar 1a1 for sealing and protecting the circuit board. The sealing ring 1a3 is an O-ring and the cross-section of the sealing ring 1a3 is a circular or square structure.

[0046] Preferably, a weight removal structure is provided on the bus bar 1a1 to reduce materials and costs.

[0047] As Figure 3 shown, after the bus bar 1a1 and the coil bracket are integrally injection-molded, winding assembly is carried out;

[0048] As Figure 4 shown, after the coil winding bracket 1a2 is injection-molded, winding assembly is carried out, and then it is injection-molded with the bus bar 1a1 again to form a secondary molding.

[0049] The locking mechanism with the above structure has the following advantages:

[0050] 1. Simplify the locking mechanism module and reduce manufacturing costs: By using integral injection molding, the design of connectors and related protective structure parts can be reduced, the parts are integrated, and the manufacturing cost of the product is reduced;

[0051] 2. Maximize the utilization of radial space: Integrally injection-molding the bus bar and the bracket can save the space arranged due to welding or connector solutions, and maximize the utilization of radial space;

[0052] 3. Improve the connection strength of parts: Integrally injection-molding the bus bar and the coil winding bracket makes the hard connection more reliable, increases the connection strength between the electromagnet and the bus bar, and improves the anti-vibration ability.

[0053] As Figure 6As shown, it is an exploded schematic diagram of the MGU with the locking mechanism of the above structure, the brushless motor 2 is arranged in the cavity corresponding to the MGU housing 3, the shaft pin 8 is press-fitted on the MGU housing 3, wherein the shaft pin 8 is arranged axially parallel to the axis of the brushless motor 2, the double gear 4 is assembled on the MGU housing 3 through the shaft pin 8, the electromagnet assembly 1 is arranged in the installation cavity 3a of the MGU housing 3, the ECU housing 5 is fixedly connected to the MGU housing 3, the circuit board 6 is arranged in the ECU housing 5, the busbar structure of the electromagnet assembly is arranged along the outer end of the double gear, maintaining a safety gap with the double gear, and the ECU shell cover 7 is fixedly connected to the ECU housing 5.

[0054] When the parking lock is engaged, the ECU transmits the locking command to the electromagnet assembly through the busbar, the electromagnet assembly is energized, the electromagnet push rod and the moving iron core extend, the push rod head extends into the locking groove on the end face of the duplex gear, the push rod cooperates with the locking groove to limit the rotation of the duplex gear, thereby realizing the locking function; when the parking lock is released, the ECU transmits the release command to the electromagnet assembly through the busbar, the electromagnet is energized in the reverse direction, the electromagnet push rod and the moving iron core retract, the push rod head retracts out of the locking groove on the end face of the duplex gear, the push rod is decoupled from the locking groove, the rotation of the duplex gear is not restricted by the push rod, thereby realizing the parking lock release.

[0055] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. The EMB locking mechanism includes an electromagnet assembly, and the electromagnet assembly includes a busbar and a coil winding bracket which are connected to each other. It is characterized in that: The busbar and the coil winding bracket are integrally injection molded.

2. The EMB locking mechanism according to claim 1, It is characterized in that: Pin pins are injection molded in the busbar, and the pin pins are connected to the joint terminals of the coil winding arranged on the coil winding bracket. The connection method between the pin pins and the joint terminals of the coil winding is welding or crimping.

3. The EMB locking mechanism according to claim 1, It is characterized in that: The leading end of the pin pin is connected to the circuit board, and the connection method between the two is welding or crimping.

4. The EMB locking mechanism according to any one of claims 1 to 3, It is characterized in that: A sealing ring is arranged on the busbar. The sealing ring is an O-ring and the cross section of the sealing ring is a circular or square structure.

5. The EMB locking mechanism according to any one of claims 1 to 3, It is characterized in that: The leading end of the pin pin is provided with a bending structure.

6. The EMB locking mechanism according to any one of claims 1 to 3, It is characterized in that: The pin pins are asymmetrically arranged at the end far from the winding coil bracket.

7. The EMB locking mechanism according to any one of claims 1 to 3, It is characterized in that: The busbar is L-shaped, and the end of the L-shaped busbar far from the winding coil bracket is parallel to the winding bracket.

8. The EMB locking mechanism according to any one of claims 1 to 3, It is characterized in that: The electromagnet assembly further includes a position detection element, and the position detection element is located inside the busbar.

9. The EMB locking mechanism according to claim 8, It is characterized in that: The position detection element is a Hall sensor.

10. The EMB locking mechanism according to any one of claims 1 to 4, It is characterized in that: The electromagnet assembly further includes a permanent magnet, and the permanent magnet is arranged on the coil winding bracket.

11. A vehicle, It is characterized in that: It includes the EMB locking mechanism according to any one of claims 1 to 10.

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