Braking device for in-wheel motor

Abstract

The present disclosure relates to a brake device for an in-wheel motor. The brake device for an in-wheel motor can include a stator, a rotor configured to rotate when electric power is applied to the stator, a brake disc interlocked with the rotor, a bracket coupled to the stator and a knuckle, and a brake caliper installed on the bracket and configured to press the brake disc. According to the present disclosure, the brake caliper is partially supported by the bracket, which makes it possible to reduce the weight and size of the brake caliper.

Description

Technical Field

[0001] Exemplary embodiments of this disclosure relate to a braking device for an in-wheel motor, and more specifically, to a braking device for an in-wheel motor having a brake caliper mounted on a bracket in the wheel, and thus being able to prevent the brake caliper from generating torque during braking, and wherein the size of the brake caliper can be reduced to reduce the weight of the vehicle. Background Technology

[0002] Typically, in-wheel motors are used in transportation devices that use electricity as a power source. The in-wheel motor is installed inside the wheel rim and outputs power, which is directly transmitted to the wheel, causing the rim and wheel to rotate. Such an in-wheel motor includes a tire, rim, stator, rotor, and shaft.

[0003] The tire is attached to the rim and covers the outer circumference of the rim. The stator and rotor constitute the motor assembly. The motor assembly is located inside the rim. The shaft is fixed to the center of the stator. The stator receives power from the outside. To enable this operation, a lead for power supply is connected to the stator through the center of the shaft.

[0004] The stator of the in-wheel motor receives electricity via leads, and the rotor rotates when electricity is applied to the stator. As a result, the rim rotates along with the rotor, causing the tire to rotate.

[0005] However, in conventional in-wheel motors, the gearbox, motor assembly, and ECU are mounted on the rear surface of the electric brake caliper, which drives the bushing to press it against the brake disc. This shifts the center of gravity of the electric brake caliper module rearward, generating torque during operation. Furthermore, conventional bracketless brake calipers generate torque due to the height difference between the operating line and the mounting point to the steering knuckle. Additionally, the torque-carrying member for accommodating the bushing is mounted on the conventional caliper, making it difficult to mount the caliper within the wheel. Finally, in conventional brake calipers, runout is measured for each assembly unit of the steering knuckle and brake disc. In this case, since the brake caliper is freely placed on the in-wheel motor and the steering knuckle on which it is mounted is not included, runout cannot be measured within the chassis module unit. Therefore, a device capable of solving these problems is needed.

[0006] The related technology disclosed herein is disclosed in Korean Patent Application Publication No. 2020-0092776, published on August 4, 2020, entitled "Brake Device of In-Wheel Motor and In-Wheel Motor Having the Same". Summary of the Invention

[0007] Various embodiments relate to a braking device for an in-wheel motor having a brake caliper mounted on a bracket in the wheel, and thus being able to prevent the brake caliper from generating torque during braking, and wherein the size of the brake caliper can be reduced to reduce the weight of the vehicle.

[0008] In one embodiment, the braking device for an in-wheel motor may include: a stator; a rotor configured to rotate when power is applied to the stator; a brake disc interlocked with the rotor; a bracket connected to the stator and the steering knuckle; and a brake caliper mounted on the bracket and configured to press against the brake disc.

[0009] The bracket may include: a main body to which the steering knuckle is coupled; one or more extensions extending from the main body and coupled to the stator; and a mounting portion disposed on the main body and to which the brake caliper is coupled.

[0010] The mounting portion may include: a pair of mounting plates disposed on the main body and spaced apart from each other while facing each other; and mounting holes formed in each of the pair of mounting plates and configured to cause engagement of the brake caliper.

[0011] The mounting portion may further include mounting guides formed on each of the pair of mounting plates and configured to guide linear movement of the brake caliper.

[0012] Each of the pair of mounting plates can form a single body with a corresponding extension in the one or more extensions.

[0013] The brake caliper may include: a brake caliper housing coupled to the bracket; a brake caliper actuator mounted on the brake caliper housing and configured to provide driving force; a brake caliper piston embedded in the brake caliper housing and movable by the brake caliper actuator; a brake caliper inner liner movable by the brake caliper piston to press one surface of the brake disc; and a brake caliper outer liner mounted on the brake caliper housing and configured to press another surface of the brake disc as the brake caliper housing moves.

[0014] The brake caliper housing may include: a housing body portion in which the brake caliper piston is embedded; a housing extension portion extending from either side of the housing body portion; and a housing support portion configured to connect the housing extension portion to the bracket and to cause sliding movement of the housing extension portion.

[0015] The brake caliper driver can move the brake caliper piston using a hydraulic or electric motor.

[0016] The brake caliper inner liner can be supported by the bracket.

[0017] The brake caliper outer liner may include: an outer plate portion connected to the brake caliper housing; and an outer liner portion assembled to the outer plate portion and configured to contact the brake disc.

[0018] The brake caliper outer liner may also include an outer support portion, which is mounted on the stator and configured to support the outer plate portion.

[0019] In the braking device for an in-wheel motor according to an embodiment of the present disclosure, the steering knuckle is mounted on the central portion of a bracket, the edge of the bracket is connected to the stator, and the brake caliper is mounted on the bracket. The brake caliper is partially supported by the bracket, which allows for a reduction in the weight and size of the brake caliper. Furthermore, when both sides of the brake caliper are mounted on the bracket, the height difference between the fixed line and the operating line of the brake caliper can be reduced to prevent torque generation. Additionally, since the brake caliper is mounted on the bracket, runout can be measured within the unit of the chassis module. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view of a braking device for an in-wheel motor according to an embodiment of the present disclosure.

[0021] Figure 2 This is an exploded view schematically showing a braking device for an in-wheel motor according to an embodiment of the present disclosure.

[0022] Figure 3 This is a schematic diagram illustrating a support according to an embodiment of the present disclosure.

[0023] Figure 4 This is a schematic diagram showing the connection between the support and the stator according to an embodiment of the present disclosure.

[0024] Figure 5 This is a schematic diagram showing the bracket and steering knuckle connected to each other according to an embodiment of the present disclosure.

[0025] Figure 6This is a perspective view schematically showing a brake caliper according to an embodiment of the present disclosure.

[0026] Figure 7 This is a schematic side view of a brake caliper according to an embodiment of the present disclosure.

[0027] Figure 8 This is a schematic diagram illustrating a brake caliper inner liner block according to an embodiment of the present disclosure.

[0028] Figure 9 This is a schematic diagram showing the brake caliper outer bushing supported by the stator according to an embodiment of the present disclosure. Detailed Implementation

[0029] In the following description, a braking device for an in-wheel motor will be illustrated with reference to the accompanying drawings through various exemplary embodiments. It should be noted that the drawings are not drawn to exact scale and may be enlarged in terms of line thickness or component dimensions for ease of description and clarity only. Furthermore, the terminology used herein is defined in consideration of the functionality of the invention and may be varied according to the user's or operator's habits or intentions. Therefore, the definition of terminology should be based on the overall disclosure set forth herein.

[0030] Figure 1 This is a schematic cross-sectional view of a braking device for an in-wheel motor according to an embodiment of the present disclosure. Figure 2 This is an exploded view schematically illustrating a braking device for an in-wheel motor according to an embodiment of the present disclosure. (Refer to...) Figure 1 and Figure 2 According to an embodiment of the present disclosure, the braking device 1 for an in-wheel motor includes a stator 10, a rotor 20, a brake disc 30, a bracket 40, and a brake caliper 50.

[0031] The stator 10 is disposed in a wheel portion 90 that rotates in connection with the rotor 20, and the wheel portion 90 has a tire 100 mounted on its exterior. For example, the stator 10 may include an iron core for supporting coils and a frame for supporting the iron core. The stator 10 may include a housing 11 and a stator 12. The housing 11 may be coupled to a bracket 40. The stator 12 may be mounted or embedded in the housing 11, surrounding or covering the rotor 20, and causing the rotor 20 to rotate when electricity is applied to the stator.

[0032] The rotor 20 is disposed inside the stator 10 and rotates when electricity is applied to the stator 10. For example, the stator 10 can generate a rotating magnetic field by sequentially applying electricity to the corresponding coils, and the rotor 20, positioned through the stator 10, can rotate along the rotating magnetic field. The wheel portion 90 can be connected to the rotor 20 and rotated by the rotor 20.

[0033] The brake disc 30 is interlocked with the rotor 20. For example, the inner circumferential surface of the brake disc 30 may be connected to the outside of the rotor 20 and disposed between the operating spaces of the brake caliper 50.

[0034] The bracket 40 is connected to the stator 10 and the steering knuckle 80. For example, the steering knuckle 80, which is connected to the vehicle body, can be mounted on the central portion of one surface of the bracket 40, and the edge of the bracket 40 can be connected to the stator 10. In addition, the hub bearing portion 70, which can rotatably support the rotor 20, can be mounted on the central portion of another surface of the bracket 40.

[0035] The brake caliper 50 is mounted on the bracket 40 and presses against the brake disc 30. For example, the brake caliper 50 can be mounted on the bracket 40 and partially supported by the bracket 40, allowing for a reduction in the size of the brake caliper 50. The brake disc 30 can be positioned within the operating space of the brake caliper 50. When the brake caliper 50 is operated according to the brake pedal operation signal, the brake caliper 50 can press against the brake disc 30, thereby providing braking force.

[0036] Figure 3 This is a schematic diagram illustrating a support according to an embodiment of the present disclosure. Figure 4 This is a schematic diagram showing the connection between the support and the stator according to an embodiment of the present disclosure, and Figure 5 This is a schematic diagram illustrating the connection between the bracket and the steering knuckle according to an embodiment of the present disclosure. (See also...) Figures 3 to 5 According to an embodiment of the present disclosure, the bracket 40 includes a main body 41, an extension 42, and a mounting part 43.

[0037] The main body 41 may be formed in an annular shape, with a hole formed in the center of the main body. The steering knuckle 80 may be mounted on one surface of the main body 41, and the wheel hub bearing 70 may be mounted on the other surface of the main body 41.

[0038] The extension 42 extends from the main body 41 and is connected to the stator 10. For example, the extension 42 may be provided as a plurality of extensions 42, which are formed circumferentially along the main body 41 and protrude in the transverse direction, and each of the plurality of extensions 42 may have an end bolted to the stator 10.

[0039] Mounting portion 43 is formed on main body portion 41, and brake caliper 50 is connected to mounting portion 43. More specifically, mounting portion 43 may include mounting plate 431 and mounting hole 432.

[0040] Mounting plates 431 are configured as a pair of mounting plates formed on the main body 41 and spaced apart from each other while facing each other. For example, the pair of mounting plates 431 can protrude from the top of the main body 41. Mounting plates 431 can be integrated with the main body 41. To improve rigidity, mounting plates 431 can be integrated with the main body 41 and the extension 42.

[0041] Mounting holes 432 are formed in each of the mounting plates 431 and cause the brake caliper 50 to engage. For example, the mounting holes 432 may be located on the same line as the drive shaft of the brake caliper 50 or adjacent to the drive shaft of the brake caliper 50, which prevents the generation of torque when the brake caliper 50 is operated.

[0042] The mounting portion 43 according to an embodiment of the present disclosure may further include a mounting guide 433. The mounting guide 433 is formed in each of the mounting plates 431 and guides the linear movement of the brake caliper 50. For example, the mounting guide 433 may be formed at a lateral end of the mounting plate 431 and have a recessed shape into which the brake caliper 50 can be inserted. Since a portion of the brake caliper 50 is placed on the mounting guide 433, the operating load on the brake caliper 50 can be reduced while reducing the size of the brake caliper 50. The mounting guide 433 can support the operating torque of the brake caliper 50.

[0043] Figure 6 This is a schematic perspective view of a brake caliper according to an embodiment of the present disclosure. Figure 7 This is a schematic side view of a brake caliper according to an embodiment of the present disclosure. Figure 8 This is a schematic diagram illustrating a brake caliper inner liner block according to an embodiment of the present disclosure. Figure 9 This is a schematic diagram illustrating the brake caliper outer bushing supported by the stator according to an embodiment of the present disclosure. (Refer to...) Figures 6 to 9 According to an embodiment of the present disclosure, the brake caliper 50 includes a brake caliper housing 51, a brake caliper driver 52, a brake caliper piston 53, a brake caliper inner liner 54, and a brake caliper outer liner 55.

[0044] The brake caliper housing 51 is connected to the bracket 40. For example, the brake caliper housing 51 may have protrusions formed on both sides thereon and connected to the bracket 40, and may slide at the connection points by external force.

[0045] The brake caliper actuator 52 is mounted on the brake caliper housing 51 and provides driving force. For example, the brake caliper actuator 52 can be assembled into or embedded in the brake caliper housing 51. When a brake pedal signal is received, the brake caliper actuator 52 can be operated by a hydraulic or electric motor.

[0046] The brake caliper piston 53 is embedded in the brake caliper housing 51 and moved by the brake caliper actuator 52. For example, the brake caliper piston 53 may be embedded in the brake caliper housing 51 and moved in one direction by the brake caliper actuator 52 to operate the brake caliper inner liner 54.

[0047] The brake caliper inner liner 54 moves via the brake caliper piston 53 and presses against a surface of the brake disc 30. The brake caliper inner liner 54 may be connected to the brake caliper piston 53, or supported by and operated via a bracket 40.

[0048] The outer caliper insert 55 is mounted on the caliper housing 51 and presses against the other side of the brake disc 30 as the caliper housing 51 moves. For example, the caliper housing 51 can move backward by the reaction force generated by the forward movement of the caliper piston 53 and push the inner caliper insert 54, so that the outer caliper insert 55 can provide braking force to the brake disc 30.

[0049] According to an embodiment of the present disclosure, the brake caliper housing 51 includes a housing body portion 511, a housing extension portion 512, and a housing support portion 513.

[0050] A brake caliper piston 53 is embedded in the housing body portion 511. For example, the housing body portion 511 may include: a first body 5111 having a brake caliper piston 53 embedded therein to cause linear movement; a second body 5112 formed on the rear surface of the first body 5111 and having a brake caliper actuator 52 mounted thereon; and a third body 5113 extending from the front surface of the housing body portion 511 and connected to the brake caliper outer liner 55.

[0051] The housing extension 512 extends from either side of the housing body 511. For example, the housing extension 512 may extend from either side of the first body 5111 and has a hole corresponding to the mounting hole 432.

[0052] The housing support 513 connects the housing extension 512 and the bracket 40, and causes sliding movement of the housing extension 512. For example, the housing support 513 may include: a first support member 5131 extending through the housing extension 512 and the bracket 40; a second support member 5132 connected to the end of the first support member 5131 by a nut; and a third support member 5133 connected to the housing extension 512 and the first support member 5131, formed in a corrugated shape such that the length of the third support member can be adjusted, and configured to block the inflow of foreign objects.

[0053] The brake caliper inner liner 54 is supported by the bracket 40. For example, the brake caliper inner liner 54 can be mounted on the mounting portion 43 and moved by the pressing of the brake caliper piston 53, pressing against the brake disc 30. The brake caliper inner liner 54 may include an inner frame portion 541 disposed between a pair of mounting plates 431 and inserted into the mounting guide 433, and an inner pressing portion 542 mounted in the inner frame portion 541 and in direct contact with the brake disc 30. When the external force is removed by the recovery unit mounted on the mounting portion 43, this brake caliper inner liner 54 can return to its initial position.

[0054] According to an embodiment of the present disclosure, the brake caliper outer liner 55 includes an outer plate portion 551 and an outer liner portion 552.

[0055] The outer plate portion 551 is connected to the brake caliper housing 51. For example, the outer plate portion 551 may be bolted to the third body 5113. The outer liner portion 552 is assembled to the outer plate portion 551 and makes direct contact with the brake disc 30.

[0056] The brake caliper outer bushing 55 may also include an outer support portion 553. The outer support portion 553 is mounted on the stator 10 and supports the outer plate portion 551. For example, the outer support portion 553 may have a shape in which the outer plate portion 551 can be inserted and moved, and support the outer plate portion 551 to reduce the load on the brake caliper. When the external force is removed by the recovery unit mounted on the outer support portion 553, the outer plate portion 551 can return to its initial position.

[0057] The assembly process and operation of the braking device for an in-wheel motor having the above-described structure according to an embodiment of the present disclosure will be described below.

[0058] Steering knuckle 80 is mounted on one surface of main body 41, and hub bearing portion 70 is mounted on another surface of main body 41. Extension 42, which protrudes laterally from main body 41, is mounted on stator 10, and brake caliper 50 is mounted on mounting portion 43, which is integrated with one or more of main body 41 and extension 42.

[0059] The brake caliper 50 includes a brake caliper housing 51 mounted on the mounting portion 43, a brake caliper actuator 52 mounted in the brake caliper housing 51 and configured to provide power, a brake caliper piston 53 embedded in the brake caliper housing 51 and movable by the brake caliper actuator 52, a brake caliper inner liner 54 configured to contact one surface of the brake disc 30 via the brake caliper piston 53, and a brake caliper outer liner 55 configured to contact the other surface of the brake disc 30.

[0060] Since the inner caliper liner 54 is supported by a pair of mounting portions 43, the load on the caliper 50 can be reduced, and the installation freedom of the caliper 50 can be improved. The outer caliper liner 55 can be connected to the caliper housing 51 and, if necessary, supported by an outer support portion 553 mounted on the stator 10, thereby reducing the load on the caliper 50.

[0061] In the above state, upon receiving a pedal operation signal, the brake caliper actuator 52 is driven to push the brake caliper inner liner 54, and the brake caliper piston 53 is supported on the brake caliper inner liner by the bracket 40. The brake caliper inner liner 54 presses against the brake disc 30 and provides braking force. As the brake caliper housing 51 moves due to the reaction force of the operation on the brake caliper piston 53, the brake caliper outer liner 55 presses against the brake disc 30 and provides braking force.

[0062] In the braking device 1 for an in-wheel motor according to an embodiment of the present disclosure, a steering knuckle 80 is mounted on the central portion of a bracket 40, the edge of which is connected to the stator 10, and a brake caliper 50 is mounted on the bracket 40. The brake caliper 50 is partially supported by the bracket 40, which allows for a reduction in the weight and size of the brake caliper 50. Furthermore, when both sides of the brake caliper 50 are mounted on the bracket 40, the height difference between the fixed line and the operating line of the brake caliper 50 can be reduced to prevent torque generation. Additionally, since the brake caliper 50 is mounted on the bracket 40, runout can be measured within the unit of the chassis module.

[0063] Although exemplary embodiments of this disclosure have been disclosed for illustrative purposes, those skilled in the art will understand that various modifications, additions, and substitutions are possible without departing from the scope and spirit of this disclosure as defined in the appended claims.

Claims

1. A braking device for an in-wheel motor, the braking device for the in-wheel motor comprising: stator; A rotor configured to rotate when electricity is applied to the stator; A brake disc, which is interlocked with the rotor; The bracket is connected to the stator and the steering knuckle; as well as A brake caliper, mounted on the bracket and configured to press against the brake disc. The steering knuckle is mounted on the central portion of one surface of the bracket, and the stator is connected to the edge of the bracket. The hub bearing portion, which can rotatably support the rotor, is mounted on the central portion of another surface of the bracket.

2. The braking device for an in-wheel motor according to claim 1, wherein, The support includes: The main body, to which the steering knuckle is connected; One or more extensions, said one or more extensions extending from said main body and connected to said stator; and The mounting part is disposed on the main body and the brake caliper is connected to the mounting part.

3. The braking device for an in-wheel motor according to claim 2, wherein, The mounting part includes: A pair of mounting plates, the pair of mounting plates being disposed on the main body and spaced apart from each other while facing each other; and Mounting holes are formed in each of the pair of mounting plates and are configured to cause the engagement of the brake caliper.

4. The braking device for an in-wheel motor according to claim 3, wherein, The mounting section also includes mounting guides formed on each of the pair of mounting plates and configured to guide the linear movement of the brake caliper.

5. The braking device for an in-wheel motor according to claim 3, wherein, Each of the pair of mounting plates forms a body with the corresponding extension of the one or more extensions.

6. The braking device for an in-wheel motor according to claim 1, wherein, The brake caliper includes: Brake caliper housing, the brake caliper housing being connected to the bracket; A brake caliper driver, which is mounted on the brake caliper housing and configured to provide driving force; A brake caliper piston, which is embedded in the brake caliper housing and moves via the brake caliper actuator; A brake caliper insert, the brake caliper insert being movable by the brake caliper piston to press against a surface of the brake disc; and A brake caliper outer liner is mounted on the brake caliper housing and configured to press against another surface of the brake disc as the brake caliper housing moves.

7. The braking device for an in-wheel motor according to claim 6, wherein, The brake caliper housing includes: The housing body portion, in which the brake caliper piston is embedded; Housing extension, the housing extension extending from either side of the housing body; and A housing support portion is configured to connect the housing extension portion to the bracket and cause sliding movement of the housing extension portion.

8. The braking device for an in-wheel motor according to claim 6, wherein, The brake caliper driver moves the brake caliper piston via a hydraulic or electric motor.

9. The braking device for an in-wheel motor according to claim 6, wherein, The brake caliper inner liner is supported by the bracket.

10. The braking device for an in-wheel motor according to claim 6, wherein, The brake caliper outer liner includes: Outer plate portion, the outer plate portion being connected to the brake caliper housing; and The outer liner block is assembled to the outer plate and is configured to contact the brake disc.

11. The braking device for an in-wheel motor according to claim 10, wherein, The brake caliper outer liner also includes an outer support portion, which is mounted on the stator and configured to support the outer plate portion.

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