Sensing device for an electromechanical brake

Abstract

Sensing device for electromechanical brake. Disclosed is a sensing device for an electromechanical brake, the sensing device for the electromechanical brake including: a power portion configured to generate an operating force for braking when power is applied to the power portion; a housing portion mounted on the power portion; a pressurizing portion mounted on the housing portion and pressurized by a reaction force caused by driving the power portion; and a sensing portion connected to the housing portion and configured to sense a pressing force of the pressurizing portion, and the sensing device can accurately measure the reaction force corresponding to the output value of the power portion for braking.

Description

Technical Field

[0001] Exemplary embodiments of this disclosure relate to a sensing device for an electromechanical brake, and more specifically, to a sensing device for an electromechanical brake capable of obtaining the reaction force generated during the transmission of output through a motor as a uniform output value. Background Technology

[0002] Typically, braking systems are installed on vehicles, and recently, various systems have been proposed to achieve stronger and more stable braking force.

[0003] Examples of braking systems include anti-lock braking systems (ABS) to prevent wheel slippage during braking, brake traction control systems (BTCS) to prevent drive wheel slippage during sudden or unexpected acceleration of the vehicle, and electronic stability control systems (ESC) to stably maintain the vehicle's driving state by controlling brake hydraulic pressure through a combination of anti-lock braking systems and traction control.

[0004] Typically, an electromechanical braking system includes an actuator that receives the driver's braking intention as an electrical signal from a pedal displacement sensor used to sense the displacement of the pedal when the driver depresses the pedal, and supplies pressure to the wheel cylinders.

[0005] In an electromechanical braking system that includes such an actuator, the actuator is operated by pedal force to generate braking pressure. In this case, the braking pressure is generated by converting the rotational force of a motor into a linear motion pressing piston.

[0006] However, the problem with existing technology is that feedback control of the actual braking force is impossible without providing a separate load sensor. Furthermore, if a separate load sensor is provided, the deformation pattern changes depending on the contact point with the caliper body due to the position of the local sensing element, thus increasing measurement dispersion. Therefore, these problems need to be addressed.

[0007] The background technology disclosed herein is disclosed in Korean Patent Application Publication No. 2018-0126288 (published on November 27, 2018 and entitled "Electromechanical Braking System"). Summary of the Invention

[0008] Various embodiments aim to provide a sensing device for an electromechanical brake that can obtain the reaction force generated during the transmission of output through a motor as a uniform output value.

[0009] In one embodiment, a sensing device for an electromechanical brake includes: a power unit configured to generate an operating force for braking when power is applied to the power unit; a housing unit mounted on the power unit; a pressurizing unit mounted on the housing unit and pressurized by a reaction force caused by driving the power unit; and a sensing unit connected to the housing unit and configured to sense the pressing pressure of the pressurizing unit.

[0010] The power unit may include: a power main body; a power motor part mounted on the power main body and driven when power is applied to the power motor part; a power screw part mounted on the power main body and rotated by the power motor part; a power support part configured to support the power screw part; and a power piston part that moves linearly when the power screw part rotates.

[0011] The housing and the pressurizing part can be disposed between the power piston part and the power nut part. The power nut part moves linearly via the power screw part and is configured to move the power piston part, and the pressurizing part is pressurized by the reaction force of the power piston part.

[0012] The housing and pressurizing parts can move linearly via the power screw and can be disposed between the power piston and the power nut configured to move the power piston, and the pressurizing part can be pressurized by the reaction force of the power piston.

[0013] The housing portion may include: a housing body portion through which the power portion penetrates and having an open front side and a space portion formed in the housing body portion; and a housing cover portion mounted on the housing body portion and configured to prevent the pressurized portion disposed in the space portion from separating.

[0014] The pressurizing part may include: a pressurizing fluid part configured to fill the housing part; a pressurizing washer part protruding from the housing part and configured to cover the pressurizing fluid part and press the pressurizing fluid part by external force; and a pressurizing airtight part mounted on the housing part, in close contact with the pressurizing washer part, and configured to prevent leakage of the pressurizing fluid part.

[0015] The pressurized fluid section can fill the housing section or be discharged from the housing section through a flow path formed on the housing section that can be opened and closed.

[0016] The pressurizing washer portion may include: a first washer portion inserted into the housing portion, the movement of the first washer portion being restricted and configured to cover the pressurizing fluid portion; and a second washer portion formed on the first washer portion, protruding outside the housing portion and being pressurized by the reaction force of the power portion.

[0017] The pressurizing part may also include a pressurizing recovery part, which is built into the housing part and configured to elastically support the pressurizing washer part.

[0018] The sensing unit is built into the power unit and connected to the housing unit.

[0019] The sensing element is inserted into the rear side of the housing and remains connected to the housing.

[0020] The sensing element can be inserted into the side of the housing and remain connected to the housing.

[0021] The sensing unit can be located outside the power unit and connected to the housing unit built into the power unit via the sensing flow path unit.

[0022] According to the sensing device for electromechanical brakes disclosed herein, the pressurizing part mounted on the housing part provides uniform pressure when the power part is driven, which makes it possible to stably maintain the measurement accuracy of the sensing part connected to the housing part. Attached Figure Description

[0023] Figure 1 This is a schematic view of a sensing device for an electromechanical brake according to an embodiment of the present disclosure.

[0024] Figure 2 This is a schematic view of the power unit according to an embodiment of the present disclosure.

[0025] Figure 3 This is a schematic view showing the housing and pressurizing parts arranged between the power body and the power screw according to an embodiment of the present disclosure.

[0026] Figure 4 This is a schematic view showing the housing portion and the pressurizing portion disposed between the power screw portion and the power piston portion according to an embodiment of the present disclosure.

[0027] Figure 5 This is a schematic view of the housing portion according to an embodiment of the present disclosure.

[0028] Figure 6 This is a schematic view of the pressurization section according to an embodiment of the present disclosure.

[0029] Figure 7 This is a schematic view showing the state of a sensing unit built into the power unit along its length according to an embodiment of the present disclosure.

[0030] Figure 8 This is a schematic view showing the state of a sensing unit built into a direction orthogonal to the power unit according to an embodiment of the present disclosure.

[0031] Figure 9 This is a schematic view showing a state in which the sensing unit according to an embodiment of the present disclosure is disposed outside the power unit. Detailed Implementation

[0032] In the following description, a sensing device for an electromechanical brake will be described with reference to the accompanying drawings through various exemplary embodiments. In this process, for clarity and ease of explanation, the dimensions of the constituent elements or the thickness of the lines shown in the figures may be exaggerated. Furthermore, the terms described below are defined in consideration of the functions described in this disclosure and may vary depending on the intent or practice of the user or operator. Therefore, each term should be defined based on the entirety of this specification.

[0033] Figure 1 This is a schematic view illustrating a sensing device for an electromechanical brake according to an embodiment of the present disclosure. (Refer to...) Figure 1 According to an embodiment of the present disclosure, the sensing device 1 for an electromechanical brake includes a power unit 10, a housing unit 20, a pressurizing unit 30, and a sensing unit 40.

[0034] When power is applied to the power unit 10, the power unit 10 generates an operating force for braking. For example, the power unit 10 can generate braking force in such a way that the motor is driven when power is applied to the power unit 10 and the pad presses against the disc mounted on the wheel.

[0035] The housing portion 20 is mounted on the power unit 10. For example, the housing portion 20 may be built into the power unit 10, and the position of the housing portion 20 may vary depending on the design. The housing portion 20 may be disposed on the power shaft that generates power to the power unit 10.

[0036] The pressurizing part 30 is mounted on the housing part 20 and is pressurized by the reaction force caused by the driving power part 10. For example, the pressurizing part 30 can contact the surface of the power part 10 and can provide uniform pressure to the sensing part 40 while being pushed out by the reaction force of the power part 10.

[0037] The sensing unit 40 is connected to the housing 20 and senses the pressing force of the pressurizing unit 30. For example, since the pressurizing unit 30 provides uniform pressure, a sensing unit 40 can be connected to the housing 20 to measure the pressure.

[0038] Figure 2 This is a schematic view of the power part according to an embodiment of the present disclosure. (See also...) Figure 2 According to the embodiments of the present disclosure, the power unit 10 includes a power main body 11, a power motor 12, a power screw 13, a power support 14, and a power piston 15.

[0039] The power unit 11 is mounted on the vehicle body and is located near the rotating wheels. For example, the power unit 11 can be fixedly mounted on the vehicle body, and a space can be formed inside the power unit 11 to accommodate the power motor 12, the power screw 13, the power support 14, and the power piston 15.

[0040] The power motor 12 is mounted on the power body 11 and is driven when power is applied to it. The power screw 13 is built into the power body 11 and is driven to rotate by the power motor 12. For example, the power motor 12 can be directly connected to the power screw 13, or it can be indirectly connected to the power screw 13 through a separate transmission gear, and the power screw 13 can be rotated when the power motor 12 is driven.

[0041] The power support portion 14 supports the power screw portion 13. For example, the power support portion 14 can be built into the power main body portion 11 and can be penetrated by the power screw portion 13. The power screw portion 13 can be rotatably supported by the power support portion 14.

[0042] When the power screw section 13 rotates, the power piston section 15 moves in a straight line. For example, the power piston section 15 moves by means of the power nut section 19, which moves in a straight line due to the power screw section 13, and the moving power piston section 15 can keep the brake pad in close contact with the wheel disc.

[0043] Figure 3 This is a schematic view showing the housing and pressurizing parts, according to an embodiment of the present disclosure, disposed between the power body and the power screw. (See reference...) Figure 3 The housing portion 20 and the pressurizing portion 30 can be assembled together to enable modularity, and can be disposed between the power main body portion 11 and the power screw portion 13. For example, the housing portion 20 and the pressurizing portion 30 can be disposed between the power support portion 14 and the power main body portion 11, and the pressurizing portion 30 can be pressurized by the reaction force of the power support portion 14.

[0044] Figure 4 This is a schematic view showing the housing portion and the pressurizing portion arranged between the power screw portion and the power piston portion according to an embodiment of the present disclosure. (Refer to...) Figure 4 The housing portion 20 and the pressurizing portion 30 can be assembled together to enable modularity, and can be separately disposed between the power screw portion 13 and the power piston portion 15. For example, the housing portion 20 and the pressurizing portion 30 can be disposed between the power nut portion 19 and the power piston portion 15, and the pressurizing portion 30 can be pressurized by the reaction force of the power piston portion 15.

[0045] Figure 5 This is a schematic view of the housing portion according to an embodiment of the present disclosure. (Refer to...) Figure 5 According to the embodiments of the present disclosure, the housing portion 20 includes a housing body portion 21 and a housing cover portion 22.

[0046] The power unit 10 penetrates the housing body 21. The housing body 21 has an open front side and a space 29 formed therein. For example, the housing body 21 may be an annular shape with an opening on the front side of the housing body 21, and may be penetrated by the motor shaft of the power screw unit 13 or the power motor unit 12.

[0047] The housing cover 22 is mounted on the housing body 21 and prevents the pressurizing part 30 provided in the space 29 from separating. For example, the housing cover 22 may be mounted on the front side of the housing body 21 and may be inserted into a portion of the space 29 around the pressurizing part 30.

[0048] Figure 6 This is a schematic view of the pressurization section according to an embodiment of the present disclosure. (Refer to...) Figure 6 According to the embodiments of the present disclosure, the pressurizing part 30 includes a pressurizing fluid part 31, a pressurizing washer part 32, and a pressurizing airtight part 33.

[0049] The pressurized fluid section 31 fills the housing section 20. For example, the pressurized fluid section 31 may be a fluid that fills the space 29 formed in the housing body section 21. The pressurized fluid section 31 may fill the housing body section 21 or be discharged from the housing body section 21 through a flow path formed in the housing body section 21 that can be opened or closed.

[0050] The pressure washer portion 32 covers the pressure fluid portion 31, protrudes from the housing portion 20, and is pressed by external force onto the pressure fluid portion 31. For example, the pressure washer portion 32 may include a first washer portion 321 and a second washer portion 322. The first washer portion 321 is inserted into the space portion 29 formed in the housing body portion 21 and is in close contact with the housing body portion 21. The second washer portion 322 is formed on the first washer portion 321, extends forward, and protrudes beyond the housing portion 20. The first washer portion 321 can be locked by the housing cover portion 22 to restrict its movement and can remain inserted into the housing body portion 21. The second washer portion 322 is exposed to the outside without interfering with the housing cover portion 22 and is pressurized by the reaction force of the power portion 10. The second washer portion 322 can be pressurized to the power support portion 14 or to the power piston portion 15.

[0051] A pressurized airtight portion 33 is installed on the housing portion 20 and is in close contact with the pressurized gasket portion 32 to prevent leakage of the pressurized fluid portion 31. For example, one or more pressurized airtight portions 33 may be installed inside the housing body portion 21 and may be in close contact with the pressurized gasket portion 32 to prevent leakage of the pressurized fluid portion 31.

[0052] The pressurizing part 30 according to the embodiments of this disclosure may further include a pressurizing recovery part 34. The pressurizing recovery part 34 is built into the housing part 20 and elastically supports the pressurizing washer part 32. For example, the pressurizing recovery part 34 may be in the form of a coil spring, and multiple pressurizing recovery parts may support the first washer part 321 and restore the pressurizing washer part 32, which has been freed from external force, to its original position.

[0053] Figure 7 This is a schematic view illustrating the state in which a sensing unit is built into the power unit along its length according to an embodiment of the present disclosure, and Figure 8 This is a schematic view illustrating the state of a sensing unit built into a direction orthogonal to the power unit according to an embodiment of the present disclosure. (See also...) Figure 7 and Figure 8 According to an embodiment of this disclosure, the sensing unit 40 is built into the power unit 10 and connected to the housing unit 20. For example, the sensing unit 40 can measure the pressure of the fluid filling the housing body 21 and can be configured to have a length in the same direction as the length of the power screw unit 13 (see reference). Figure 7 Alternatively, it can be configured to have a length in a direction orthogonal to the length of the power screw section 13 (see reference). Figure 8 The sensing unit 40 can be pressurized into the housing body 21 and can remain directly connected to the housing body 21. When the sensing unit 40 is horizontally arranged in the longitudinal direction of the power screw 13, the sensing unit 40 can be inserted into the rear side of the housing body 21 of the housing part 20 and can remain connected to the housing body 21. Furthermore, when the sensing unit 40 is orthogonal to the longitudinal direction of the power screw 13, the sensing unit 40 can be inserted into the side of the housing body 21 of the housing part 20 and can remain connected to the housing body 21. This arrangement of the sensing unit 40 can vary depending on the shape of the power unit 10 and the housing part 20.

[0054] Figure 9 This is a schematic view showing a state in which the sensing unit according to an embodiment of the present disclosure is disposed outside the power unit. (See reference...) Figure 9According to the embodiments of the present disclosure, the sensing unit 40 is disposed outside the power unit 10 and connected to the housing unit 20 built into the power unit 10. For example, the sensing unit 40 may be fixedly mounted on the outside of the power unit 10 and may be indirectly connected to the housing unit 20 through the sensing flow path 50.

[0055] The operation of a sensing device for an electromechanical brake according to an embodiment of the present disclosure having the above-described structure will be described below.

[0056] If the pressurized fluid portion 31 fills the space portion 29 formed in the housing body portion 21, the space portion 29 is sealed by the pressurized gasket portion 32, and the housing cover portion 22 is mounted on the housing body portion 21 to restrict the pressurized gasket portion 32. Furthermore, the housing body portion 21 is directly or indirectly connected to the sensing portion 40.

[0057] The housing body 21 is disposed between the power screw part 13 and the power body part 11 or between the power screw part 13 and the power piston part 15.

[0058] If the brake pedal is operated in the above state, the power screw 13 rotates when the power motor 12 is driven, and the power piston 15 moves via the power screw 13. As a result, the brake pads press against the disc formed on the wheel.

[0059] Furthermore, the pressure washer portion 32 is pressurized due to the reaction force generated during the pressurization process of the power piston portion 15. If the pressure washer portion 32 is pressurized, the pressure of the fluid filling the space portion 29 increases uniformly.

[0060] Therefore, although the sensing unit 40 is connected to various points of the housing body 21, it can measure the uniform increase in pressure of the fluid and thus maintain stable measurement accuracy.

[0061] According to the embodiments of the present disclosure, in the sensing device for an electromechanical brake, when the power unit 10 is driven, the pressurizing unit 30 mounted on the housing 20 provides uniform pressure, which makes it possible to stably maintain the measurement accuracy of the sensing unit 40 connected to the housing 20.

[0062] Although exemplary embodiments of this disclosure have been described for illustrative purposes, those skilled in the art will understand that various modifications, additions, and substitutions may be made without departing from the scope and spirit of this disclosure as defined by the appended claims.

[0063] Cross-reference to related applications

[0064] This application claims priority to Korean Patent Application No. 10-2021-0129108, filed on September 29, 2021, which is incorporated herein by reference for all purposes, as fully set forth herein.

Claims

1. A sensing device for an electromechanical brake, the sensing device comprising: A power unit, configured to generate an operating force for braking when power is applied to the power unit; A housing portion, which is mounted on the power unit; A pressurizing part, which is mounted on the housing part and is pressurized by the reaction force caused by driving the power part; as well as A sensing unit, connected to the housing portion and configured to sense the pressing force of the pressurizing unit, The pressurizing section includes: A pressurized fluid section, the pressurized fluid section being configured to fill the housing section; A pressure washer portion, the pressure washer portion protruding from the housing portion and configured to cover the pressure fluid portion and press the pressure fluid portion by external force; and A pressurized airtight part is installed on the housing part, in close contact with the pressurized gasket part, and is configured to prevent leakage of the pressurized fluid part.

2. The sensing device for an electromechanical brake according to claim 1, wherein, The power unit includes: Power unit; A power motor unit is mounted on the power main body unit and is driven when the power is applied to the power motor unit; A power screw section, which is mounted on the power body section and rotates via the power motor section; A power support portion, configured to support the power screw portion; and The power piston section moves linearly when the power screw section rotates.

3. The sensing device for an electromechanical brake according to claim 2, wherein, The housing portion and the pressurizing portion are disposed between the power support portion and the power main body portion, and the pressurizing portion is pressurized by the reaction force of the power support portion.

4. The sensing device for an electromechanical brake according to claim 2, wherein, The housing portion and the pressurizing portion are disposed between the power piston portion and the power nut portion. The power nut portion moves linearly via the power screw portion and is configured to move the power piston portion. The pressurizing portion is pressurized by the reaction force of the power piston portion.

5. The sensing device for an electromechanical brake according to claim 1, wherein, The housing portion includes: A housing body portion, through which the power unit penetrates, and having an open front side and a space formed within the housing body portion; and A housing cover is mounted on the housing body and is configured to prevent the pressurized portion disposed in the space from separating.

6. The sensing device for an electromechanical brake according to claim 1, wherein, The pressurized fluid portion fills the housing portion or is discharged from the housing portion through a flow path formed on the housing portion that can be opened and closed.

7. The sensing device for an electromechanical brake according to claim 1, wherein, The pressure washer portion includes: A first washer portion, the first washer portion being inserted into the housing portion, the movement of the first washer portion being restricted, and being configured to cover the pressurized fluid portion; and The second washer portion is formed on the first washer portion, protrudes outside the housing portion, and is pressurized by the reaction force of the power portion.

8. The sensing device for an electromechanical brake according to claim 1, wherein, The pressurizing part further includes a pressurizing recovery part, which is built into the housing part and configured to elastically support the pressurizing washer part.

9. The sensing device for an electromechanical brake according to claim 1, wherein, The sensing unit is built into the power unit and connected to the housing unit.

10. The sensing device for an electromechanical brake according to claim 1, wherein, The sensing element is inserted into the rear side of the housing and remains connected to the housing.

11. The sensing device for an electromechanical brake according to claim 1, wherein, The sensing element is inserted into the side of the housing and remains connected to the housing.

12. The sensing device for an electromechanical brake according to claim 1, wherein, The sensing unit located outside the power unit and the housing unit built into the power unit are connected by a sensing flow path.

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