Electromagnetic braking type hub motor

Abstract

The utility model relates to an electromagnetic brake type hub motor, which comprises a stator part, a rotor part and a shell, and a hub cavity is formed between the inner wall of the shell and the rotor part. A bolt type band-type brake mechanism is arranged in the hub cavity, the bolt type band-type brake mechanism comprises a brake fluted disc coaxially mounted on the periphery of the rotor part, and the brake fluted disc synchronously rotates along with the rotor part; the bolt type band-type brake mechanism further comprises an electromagnetic insertion shaft assembly which is fixedly installed relative to the shell and connected with the circuit board through an electric wire, an insertion shaft part of the electromagnetic insertion shaft assembly is in a retracting state in a power-on state, and the insertion shaft part stretches out and is inserted into the positioning opening in a power-off state. In the scheme, the electromagnetic insertion shaft assembly is connected with the circuit board through the electric wire, that is, the electromagnetic insertion shaft assembly and the stator part are connected in the same circuit, so that when the stator part is powered off, the electromagnetic insertion shaft assembly is powered off, and the power-off braking function of the hub motor is achieved.

Description

Technical Field

[0001] The utility model relates to a wheel hub motor technology, in particular to an electromagnetic braking wheel hub motor. Background Art

[0002] The hub motor integrates the power device, transmission device, etc. into the wheel, showing the significant advantages of simplifying the vehicle structure, improving space utilization and transmission efficiency, and has received widespread attention and research. Although the hub motor technology has many advantages, it also faces a series of challenges in practical applications. In particular, how to efficiently and reliably achieve vehicle braking control is a key technical problem in the design of hub motors. For example, in the event of a sudden loss of power to the motor, if the wheel on which the hub motor is installed cannot be braked in time, the vehicle will continue to move under the action of inertia and will be difficult to control. In the event of a power failure on a slope, the vehicle's slide may cause serious safety accidents.

[0003] Therefore, developing a technology that can still effectively brake when the motor loses power can not only greatly improve the safety performance of vehicles (devices) using hub motors, but also is the key to promoting the development of hub motors and related technologies to higher standards. Summary of the invention

[0004] The utility model aims to provide an electromagnetic brake wheel hub motor. By adding a latch-type brake mechanism inside the wheel hub motor, when the wheel hub motor is powered off, the latch-type brake mechanism is also powered off, thereby achieving the purpose of synchronous braking at the moment of power failure.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electromagnetic brake hub motor, comprising a stator part and a rotor part, and a circuit board connected to the stator part, wherein a rotating body shell is arranged on the outer periphery of the rotor part, the front part of the shell is fixedly mounted on the stator part, and a hub cavity is formed between the inner wall of the shell and the rotor part. A latch-type brake mechanism is arranged in the hub cavity, the latch-type brake mechanism comprises a brake sprocket coaxially mounted on the outer periphery of the rotor part, the brake sprocket rotates synchronously with the rotor part, and a plurality of positioning openings are evenly arranged on the brake sprocket around the rotor part; the latch-type brake mechanism also comprises an electromagnetic plug-in shaft assembly, the electromagnetic plug-in shaft assembly is fixedly mounted relative to the shell, is connected to the circuit board through electric wires and can be independently controlled, and the plug-in shaft part of the electromagnetic plug-in shaft assembly can be inserted into the positioning opening after being extended.

[0006] In the above technical solution, the brake sprocket is arranged on the outer periphery of the rotor part and rotates synchronously with the rotor part, and the electromagnetic plug-in shaft assembly is fixed relative to the housing. Since the housing and the stator part always remain in the original position, the rotation of the brake sprocket can be restricted after the plug-in shaft part of the electromagnetic plug-in shaft assembly is inserted into the positioning opening of the brake sprocket. In this solution, the entire latch-type brake mechanism is arranged in the wheel hub cavity, making full use of the internal space of the wheel hub motor, so the size of the wheel hub motor will not be increased in the case of a built-in brake structure.

[0007] As a preferred solution for the electromagnetic plug-in shaft assembly, the electromagnetic plug-in shaft assembly uses a bidirectional self-holding electromagnet. In the non-braking state, the plug-in shaft part of the electromagnetic plug-in shaft assembly will automatically stay in a retracted state under the action of magnetic force, that is, the plug-in shaft part is away from the brake gear disc. When braking is required, the bidirectional self-holding electromagnet is controlled to be energized to extend the plug-in shaft part and insert it into the positioning port. Therefore, there is no need to keep the electromagnetic plug-in shaft assembly in a powered state for a long time, thereby avoiding burning out the electromagnet.

[0008] As another preferred solution for the electromagnetic plug-in shaft assembly, the electromagnetic plug-in shaft assembly uses a unidirectional self-holding electromagnet and a reset spring is installed on the plug-in shaft part. When the hub motor loses power, the plug-in shaft part of the electromagnetic plug-in shaft assembly automatically extends and inserts into the positioning port under the action of the reset spring, thereby enabling the hub motor to have the function of power-off braking.

[0009] For the solution of the hub motor with power-off braking function, it is preferred to set a current limiting module on the connection loop of the electromagnetic plug-in shaft assembly. The current limiting module can reduce the current when the electromagnetic plug-in shaft assembly is powered on for a long time, thereby preventing the electromagnetic plug-in shaft assembly from burning out.

[0010] As a preferred solution, the middle of the brake sprocket is a circular mounting hole, the circumference is a number of evenly distributed brake teeth, and the positioning opening is the tooth gap between adjacent brake teeth; a bolt hole I is provided on the brake sprocket, and the brake sprocket is installed on the rotor part by means of a bolt passing through the bolt hole I. In this solution, the brake sprocket is independently provided and has a dedicated fixing hole, so its bracket can be added to the existing wheel hub motor, and it is also convenient to replace a damaged brake sprocket.

[0011] As a preferred solution, an inner mounting ring is provided in the wheel hub cavity, the middle part of which is a circumference of which fits the inner wall of the outer shell and is provided with a plurality of bolt holes III, and the entire inner mounting ring is fixed to the inner wall of the outer shell by a plurality of bolts passing through the side wall of the outer shell, so it can also be directly installed in the existing wheel hub motor; a pin hole is provided axially through the inner mounting ring, and the electromagnetic plug-in shaft assembly is installed on the inner mounting ring and the plug-in shaft part passes through the pin hole. At the moment of braking, the electromagnetic plug-in shaft assembly will transfer the impact force to the inner mounting ring, and the inner mounting ring is installed in contact with the inner wall of the outer shell by a plurality of bolts, and the outer shell will provide multi-point support to the inner mounting ring, so the inner mounting ring can resist the impact force and keep the electromagnetic plug-in shaft assembly in a fixed installation position, thereby ensuring that the latch-type brake mechanism has sufficient braking capacity.

[0012] As a preferred solution, the end of the plug-in shaft portion is a brake pin. In the non-braking state, the entire brake pin is located in the pin hole. When braking, the front end of the brake pin extends out and inserts into the tooth gap, and the rear end is located in the pin hole, and the inner wall of the pin hole fits the outer wall of the rear part of the brake pin. The brake pin is a structure that directly contacts the brake sprocket. When braking, the front end of the brake pin is inserted into the tooth gap, and the rear end is located in the pin hole. The pin hole supports the rear part of the brake pin through the inner wall to withstand the lateral impact generated by the brake pin, thereby avoiding damage to the electromagnetic plug-in shaft assembly.

[0013] As a preferred solution, two mounting plates with bolt holes are distributed on both sides of the electromagnetic plug-in shaft assembly, and screw holes are correspondingly provided on both sides of the pin hole. The electromagnetic plug-in shaft assembly is mounted on the inner mounting ring by bolts.

[0014] As a preferred solution, an operating hole connected to the hub cavity is opened on the shell, and the operating hole is opposite to the electromagnetic plug-in shaft assembly. The electromagnetic plug-in shaft assembly can be disassembled and assembled through the operating hole, which facilitates the maintenance of the electromagnetic plug-in shaft assembly.

[0015] As a preferred solution, a wire groove is provided on the outer wall of the housing, and the wires are distributed along the wire groove, which can prevent the wires from protruding and affecting the installation of the wheat wheel, and can better protect the wires from damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a partial cross-sectional structural schematic diagram of an existing hub motor for a Mecanum wheel;

[0018] Figure 2 A schematic plan view of the structure of a hub motor with power-off braking function provided in this embodiment;

[0019] Figure 3 for Figure 2 The three-dimensional structural schematic diagram of the wheel hub motor shown;

[0020] Figure 4 It is a structural schematic diagram of the brake sprocket;

[0021] Figure 5 It is a schematic diagram of the installation structure of the brake sprocket on the rotor part;

[0022] Figure 6 It is a schematic diagram of the disassembled structure of the electromagnetic plug-in shaft assembly and the inner mounting ring;

[0023] Figure 7 It is a schematic diagram of the planar structure of the electromagnetic plug-in shaft assembly;

[0024] Figure 8 for Figure 2 The working state diagram of the electromagnetic plug-in shaft assembly of the hub motor shown in the power-on state;

[0025] Fig. 9 It is a schematic diagram of the braking state of the latch-type brake mechanism when the hub motor is in a power-off state.

[0026] In the figure, the stator part 1, the rotor part 2, the outer shell 7, the wheel hub cavity 8, the brake sprocket 9, the brake teeth 10, the mounting hole 11, the bolt hole I12, the tooth gap 13, the electromagnetic plug shaft assembly 14, the inner mounting ring 15, the operating hole 71, the wire groove 72, the bolt hole II73, the wire 141, the brake pin 142, the mounting plate 143, the avoidance hole 151, the pin hole 152, the bolt hole III153, and the screw hole 154. DETAILED DESCRIPTION

[0027] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0028] Figure 1 The schematic diagram of the cross-sectional structure of the wheel hub motor without power-off braking function is shown in the figure. In the figure, the stator part 1 has a hollow mounting shaft, and the power line passes through the mounting shaft and connects to the circuit board in the internal space of the stator (the hollow mounting shaft is a prior art, which is used for the cable to pass through and supply power to the stator). The rotor part 2 is coaxially mounted with the stator part 1, and a rotating body shell 7 is arranged on the outer periphery of the rotor part 2. Based on the shape of the rotor part 2 itself, a rotation body shell 7 is formed between the rotor part 2 and the rotor part 2. Figure 1The wheel hub cavity 8 shown in the figure. The difference between this embodiment and the existing wheel hub motor is that a latch-type brake mechanism is provided in the wheel hub cavity 8, and the latch-type brake mechanism includes a brake sprocket 9 fixedly installed relative to the rotor part 2, and also includes an electromagnetic plug-in shaft assembly 14 fixedly installed relative to the stator part, so that the wheel hub motor itself has a power-off braking function, and as shown in FIG. Figure 2 As shown, an operating hole 71 is provided on the housing 7 to facilitate the disassembly and assembly of the electromagnetic plug-in shaft assembly 14 in the latch-type brake mechanism. In addition, a wire groove 72 is provided on the surface of the housing 7, and the rear end extends to the operating hole 71, and a through hole is provided at the front end of the wire groove 72. The connecting wire of the electromagnetic plug-in shaft assembly 14 is placed in the wire groove 72 and is connected to the circuit board inside the stator part 1 after passing through the through hole. That is, the latch-type brake mechanism used is connected to the same power supply line as the stator part 1.

[0029] Specifically, the latch-type brake mechanism used in this embodiment can be directly installed on Figure 1 In the hub cavity 8, as Figure 4 As shown, the middle part of the brake sprocket 9 is a circular mounting hole 11, and the circumference is evenly distributed with 12 brake teeth 10. The tooth gaps 13 between adjacent brake teeth 10 serve as positioning openings for cooperating with the electromagnetic plug shaft assembly 14, and 6 bolt holes I12 are evenly arranged around the mounting hole 11 on the brake sprocket 9; 6 bolt holes are arranged axially on the rotor part 2, as shown in FIG. Figure 5 As shown, after the brake sprocket 9 is coaxially mounted on the rotor part 2, the brake sprocket 9 is fixed to the rotor part 2 using bolts passing through the bolt holes I12.

[0030] like Figure 6 As shown, an annular inner mounting ring 15 is provided inside the housing 7. Figure 6 As can be seen in the figure, a plurality of bolt holes III153 are arranged on the outer circumference of the inner mounting ring 15, and a plurality of bolt holes II73 are arranged on the outer shell 7 correspondingly. The inner mounting ring 15 is arranged to fit the inner wall of the outer shell 7 and is fixedly installed by bolts, and an avoidance hole 151 is arranged in the middle of the inner mounting ring 15 for the rotor part 2 to pass through, so the inner mounting ring 15 does not contact the rotor part 2. In addition, a pin hole 152 is arranged axially through the inner mounting ring 15, and screw holes 154 are respectively arranged on the upper and lower sides of the pin hole 152, combined with Figure 7It can be seen that a brake pin 142 is installed at the end of the plug shaft part of the electromagnetic plug shaft assembly 14, and two mounting plates 143 with bolt holes are distributed on both sides of the electromagnetic plug shaft assembly 14, wherein the mounting plate 143 is installed at the screw hole 154 by bolts, and the brake pin 142 is inserted into the pin hole 152. In this embodiment, the electromagnetic plug shaft assembly 14 uses a one-way self-holding electromagnet, and a reset spring is installed on the plug shaft part, and the power on and off of the electromagnetic plug shaft assembly 14 can be actively controlled. Of course, when the hub motor is powered off, the brake pin 142 will automatically extend under the action of the reset spring, thereby realizing power-off braking. Since this embodiment uses a one-way self-holding electromagnet, and needs to maintain a continuous power-on state in the non-braking state, in order to prevent the electromagnet from burning out, a current limiting module is set on the wiring loop of the electromagnetic plug shaft assembly 14.

[0031] In this embodiment, the pin hole 152 is a stepped hole with a small diameter on the left side and a large diameter on the right side (the diameter close to the electromagnetic plug shaft assembly 14 is large). Similarly, the brake pin 142 has a small diameter at the front end and a large diameter at the rear end, and is installed in conjunction with the pin hole 152. Figure 8 As shown, in the power-on state, the front end of the brake pin 142 is retracted into the pin hole 152. When the hub motor loses power, as shown in FIG. Fig. 9 As shown, the front portion of the brake pin 142 extends out and is inserted into the tooth gap 13 of the brake sprocket 9. At this time, the brake sprocket 9 and the rotor part 2 stop rotating, thereby achieving the purpose of instantaneous braking when power is lost.

[0032] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0033] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0034] The above description shows and describes several preferred embodiments of the utility model, but as mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. An electromagnetic brake wheel hub motor, comprising a stator part and a rotor part, and a circuit board connected to the stator part, wherein a rotating body shell is arranged on the outer periphery of the rotor part, the front part of the shell is fixedly mounted on the stator part, and a wheel hub cavity is formed between the inner wall of the shell and the rotor part, characterized in that: A latch-type brake mechanism is arranged in the wheel hub cavity, and the latch-type brake mechanism includes a brake sprocket installed coaxially on the outer periphery of the rotor part, the brake sprocket rotates synchronously with the rotor part, and a plurality of positioning openings are evenly arranged on the brake sprocket around the rotor part; the latch-type brake mechanism also includes an electromagnetic plug-in shaft assembly, which is fixedly installed relative to the housing, is connected to the circuit board through electric wires and can be independently controlled, and the plug-in shaft part of the electromagnetic plug-in shaft assembly can be inserted into the positioning opening after being extended.

2. The electromagnetic brake hub motor according to claim 1, characterized in that: The electromagnetic shaft plug assembly is a bidirectional self-holding electromagnet.

3. The electromagnetic brake hub motor according to claim 1, characterized in that: The electromagnetic shaft plug assembly is a one-way self-holding electromagnet, and a reset spring is mounted on the shaft plug part. When the hub motor loses power, the shaft plug part of the electromagnetic shaft plug assembly automatically extends and inserts into the positioning port under the action of the reset spring.

4. The electromagnetic brake hub motor according to claim 3, characterized in that: A current limiting module is provided on the wiring loop of the electromagnetic plug shaft assembly.

5. The electromagnetic brake hub motor according to claim 1, characterized in that: The middle part of the brake sprocket is a circular mounting hole, the circumference is a number of evenly distributed brake teeth, and the positioning opening is the tooth gap between adjacent brake teeth; a bolt hole I is set on the brake sprocket, and it is installed on the rotor part by means of a bolt passing through the bolt hole I.

6. The electromagnetic brake hub motor according to claim 5, characterized in that: An inner mounting ring is arranged in the wheel hub cavity, the middle part of the inner mounting ring is an avoidance hole for avoiding the rotor part, the circumference of the inner mounting ring fits the inner wall of the outer shell and is provided with a plurality of bolt holes III, and the entire inner mounting ring is fixed to the inner wall of the outer shell by a plurality of bolts passing through the side wall of the outer shell; a pin hole is arranged axially through the inner mounting ring, the electromagnetic plug shaft assembly is installed on the inner mounting ring and the plug shaft part passes through the pin hole.

7. The electromagnetic brake hub motor according to claim 6, characterized in that: The front end of the plug-in shaft part is the brake pin. When in the non-braking state, the entire brake pin is located in the pin hole. When braking, the front end of the brake pin extends out and inserts into the tooth gap, the rear end is located in the pin hole, and the inner wall of the pin hole fits the outer wall of the rear of the brake pin.

8. The electromagnetic brake hub motor according to claim 6, characterized in that: Two mounting plates with bolt holes are distributed on both sides of the electromagnetic plug-in shaft assembly, and screw holes are correspondingly arranged on both sides of the pin hole. The electromagnetic plug-in shaft assembly is mounted on the inner mounting ring by bolts.

9. An electromagnetic brake hub motor according to any one of claims 1 to 8, characterized in that: An operating hole communicating with the hub cavity is provided on the housing, the operating hole is directly opposite to the electromagnetic plug-in shaft assembly, and the electromagnetic plug-in shaft assembly can be disassembled and assembled through the operating hole.

10. An electromagnetic brake hub motor according to any one of claims 1 to 8, characterized in that: A wire groove is arranged on the outer wall of the housing, and the wires are distributed along the wire groove.

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