Scanning device for electromechanical brake

Abstract

A sensor device for an electromechanical brake is disclosed, comprising: a power part configured to generate an actuating force for braking when power is applied to it; a housing part attached to the power part; a pressurized part attached to the housing part and pressurized by a reaction force caused by driving the power part; and a sensor part connected to the housing part and configured to detect a pressure force through the pressurized part.

Description

CROSS-REFERENCE TO RELATED REGISTRATION

[0001] This application claims the priority and benefits of Korean patent application No. 10-2021-0129108, filed on September 29, 2021, which is hereby incorporated by reference for all purposes as if it were included herein. BACKGROUND

[0002] Exemplary embodiments of the disclosure relate to a sensor device for an electromechanical brake and, in particular, to a sensor device for an electromechanical brake that can receive a reaction force generated in a process of transmitting power through a motor as a uniform output value. BACKGROUND DISCUSSION

[0003] Generally, a braking system is essentially installed in a vehicle for braking purposes, and recently various types of systems have been proposed to achieve a stronger and more stable braking force.

[0004] Examples of the braking system include an anti-lock braking system (ABS) to prevent wheels from slipping during braking, a brake traction control system (BTCS) to prevent drive wheels from spinning during sudden unintended acceleration or sudden acceleration of a vehicle, and an electronic stability control system (ESC) to maintain the vehicle's driving condition stably by controlling hydraulic brake pressure through a combination of the anti-lock braking system and traction control.

[0005] In general, the electromechanical braking system has an actuator that receives an electrical signal indicating a driver's intention to brake from a pedal displacement sensor, in order to detect the pedal displacement when the driver presses the pedal, and delivers pressure to a wheel cylinder.

[0006] In the electromechanical braking system containing such an actuator, the actuator is activated by pedal force to generate brake pressure. In this case, the brake pressure is generated by pushing a piston, converting the motor's rotational force into linear motion.

[0007] However, the current state of the art has a problem in that, without a separate force sensor, it is not possible to control the actual braking force. Furthermore, a problem with the current state of the art is that, when a separate load sensor is present, the deformation pattern corresponding to a contact position with a brake caliper body is altered due to the position of a local sensor element, thus resulting in large measurement variations. Accordingly, there is a need to address these problems.

[0008] The background technology of the disclosure is disclosed in Korean patent application No. 2018-0126288 (published on November 27, 2018 and entitled “Electromechanical Brake System”). SUMMARY

[0009] Various embodiments relate to a sensor device for an electromechanical brake that can receive a reaction force generated during the transmission of an output by a motor as a uniform output value.

[0010] In one embodiment, a sensor device for an electromechanical brake comprises: a power part configured to generate an actuating force for braking when power is applied to it; a housing part attached to the power part; a pressurized part attached to the housing part and pressurized by a reaction force caused by driving the power part; and a sensor part connected to the housing part and configured to detect a pressure force through the pressurized part.

[0011] The power part may comprise: a power body part; a power motor part attached to the power body part and driven when power is applied to it; a power screw part attached to the power body part and rotated by the power motor part; a power bearing part configured to support the power screw part; and a power piston part that moves in a straight line when the power screw part is rotated.

[0012] The housing part and the pressurized part can be arranged between the power piston part and a force nut part, wherein the force nut part is moved in a straight line by the power screw part and is configured to move the power piston part, and pressurize the pressurized part by the reaction force of the force piston part.

[0013] The housing part and the pressurized part can be moved in a straight line through the power screw part and arranged between the power piston part and a power nut part designed to move the power piston part, and the pressurized part can be pressurized by the reaction force of the power piston part.

[0014] The housing part may comprise: a housing body part which is penetrated by the power part and has an open front and a space part formed therein; and a housing cover part which is attached to the housing body part and is designed to prevent separation of the pressurized part arranged in the space part.

[0015] The pressurized part may comprise: a pressurized fluid part configured to fill the housing part; a pressurized sealing part projecting from the housing part and configured to cover the pressurized fluid part and to pressurize the pressurized fluid part by an external force; and a pressurized airtight part attached to the housing part, which comes into close contact with the pressurized disc part and is configured to prevent leakage of the pressurized fluid part.

[0016] The pressurized fluid component can fill the housing component or be discharged from the housing component through a flow path formed on the housing component that can be opened or closed.

[0017] The pressurized sealing part can comprise: a first sealing part which is inserted into the housing part, its movement being limited, and which is designed to cover the pressurized fluid part; and a second sealing part which is formed on the first sealing part, projects from the housing part and is pressurized by the reaction force of the drive part.

[0018] The pressurized part may also include a pressurized recovery part which is installed in the housing part and designed to elastically support the pressurized sealing part.

[0019] The sensor part can be installed in the power part and connected to the housing part.

[0020] The sensor part can be inserted into the back of the housing part and remain connected to the housing part.

[0021] The sensor part can be inserted into a side of the housing part and remain connected to the housing part.

[0022] The sensor part can be arranged outside the power part and connected to the housing part built into the power part by a sensor flow path part.

[0023] In the sensor device for the electromechanical brake according to the disclosure, the pressurized part mounted on the housing part ensures a uniform pressure when the power part is driven, which makes it possible to keep the measuring accuracy of the sensor part connected to the housing part stable. List of characters Fig. Figure 1 is a schematic representation of a sensor device for an electromechanical brake according to an embodiment of the disclosure. Fig. Figure 2 is a schematic representation of a performance component according to an embodiment of the disclosure. Fig. Figure 3 is a view that schematically represents a state in which a housing part and a pressurized part are arranged between a power body part and a power screw part according to an embodiment of the disclosure. Fig. Figure 4 is a view schematically showing a state in which a housing part and a pressurized part are arranged between a power screw part and a power piston part according to an embodiment of the disclosure. Fig. Figure 5 is a schematic view of a housing part according to an embodiment of the disclosure. Fig. Figure 6 is a schematic view of a pressurized part according to one embodiment of the disclosure. Fig. Figure 7 is a view that schematically shows a state in which a sensor part is installed in a longitudinal direction of a power part according to an embodiment of the disclosure. Fig. Figure 8 is a view that schematically shows a state in which a sensor part is constructed orthogonally in one direction to a power part according to an embodiment of the disclosure. Fig. Figure 9 is a view that schematically shows a state in which a sensor part is arranged outside a power part according to an embodiment of the disclosure. DETAILED DESCRIPTION OF THE ILLUSTRATED EXECUTION FORMS

[0024] A sensor device for an electromechanical brake is described below with reference to the accompanying drawings and various exemplary embodiments. In such a procedure, the thickness of the lines or the sizes of components shown in the drawings may be exaggerated for the sake of clarity and simplicity of explanation. Furthermore, terms described below have been defined taking into account functions in the disclosure and may differ depending on the intention or practice of a user or operator. Accordingly, each term should be defined based on its meaning throughout the entire description.

[0025] Fig. Figure 1 is a view schematically showing a sensor device for an electromechanical brake according to an embodiment of the disclosure. Referring to Fig. 1 comprises a sensor device 1 for an electromechanical brake according to an embodiment of the disclosure, a power part 10, a housing part 20, a pressurized (pressurized) part 30 and a sensor part 40.

[0026] The power unit 10 generates an operating force for braking when it is supplied with current. For example, the power unit 10 can generate a braking force in such a way that a motor is driven when power is applied to the power unit 10 and a pad presses against a disc mounted on a wheel.

[0027] The housing part 20 is mounted on the power unit 10. The housing part 20 can, for example, be integrated into the power unit 10, whereby the position of the housing part 20 may vary depending on the design. The housing part 20 can be arranged on a drive shaft on which the power of the power unit 10 is generated.

[0028] The pressurized part 30 is mounted on the housing part 20 and is pressurized by a reaction force caused by the drive of the power part 10. For example, the pressurized part 30 can be in surface contact with the drive part 10 and exert a uniform pressure on the sensor part 40 while being pushed out by the reaction force of the drive part 10.

[0029] The sensor part 40 is connected to the housing part 20 and measures a pressure force through the pressurized part 30. Since the pressurized part 30 generates a uniform pressure, a sensor part 40 can, for example, be connected to the housing part 20 to measure the pressure.

[0030] Fig. Figure 2 is a view schematically showing a force-bearing element according to one embodiment of the disclosure. Referring to Fig. 2 The power part 10 according to an embodiment of the disclosure comprises a power body part 11, a power motor part 12, a power screw part 13, a power bearing part 14 and a power piston part 15.

[0031] The drive unit 11 is mounted on a vehicle body and positioned near a rotating wheel. The power unit 11 can, for example, be permanently installed on the vehicle body, and a space for receiving the power motor part 12, the power screw part 13, the power bearing part 14, and the power piston part 15 can be formed inside the power unit 11.

[0032] The power motor part 12 is mounted on the power body part 11 and is driven when force is applied to it. The power screw part 13 is integrated into the power body part 11 and is rotated by the power motor part 12. For example, the power motor part 12 can be directly connected to the power screw part 13 or indirectly to the power screw part 13 via a separate transmission mechanism, and when the power motor part 12 is driven, the power screw part 13 can be rotated.

[0033] The power bearing part 14 supports the power screw part 13. The power bearing part 14 can, for example, be installed in the power body part 11 and penetrated by the power screw part 13. The power screw part 13 can be rotatably mounted on the power bearing part 14.

[0034] The power piston part 15 is moved in a straight line when the power screw part 13 is rotated. The power piston part 15 is moved, for example, by a power nut part 19, which is moved in a straight line by the power screw part 13, and the moving power piston part 15 can keep a brake pad in close contact with the wheel disc.

[0035] Fig. Figure 3 is a view that schematically represents a state in which a housing part and a pressurized part are arranged between a power body part and a power screw part according to an embodiment of the disclosure. Referring to Fig. 3. The housing part 20 and the pressure part 30 can be assembled together to enable modularization and can be arranged between the power body part 11 and the power screw part 13. For example, the housing part 20 and the pressurized part 30 can be arranged between the power bearing part 14 and the power body part 11, and the pressurized part 30 can be pressurized by the reaction force of the power bearing part 14.

[0036] Fig. Figure 4 is a view schematically showing a state in which a housing part and a pressurized part are arranged between a power screw part and a power piston part according to an embodiment of the disclosure. Referring to Fig. 4. The housing part 20 and the pressurized part 30 can be assembled together for modularization and can be arranged between the power screw part 13 and the power piston part 15. For example, the housing part 20 and the pressurized part 30 can be arranged between the power nut part 19 and the power piston part 15, and the pressurized part 30 can be pressurized by the reaction force of the power piston part 15.

[0037] Fig. Figure 5 is a view schematically showing a housing part according to one embodiment of the disclosure. Referring to Fig. 5, according to one embodiment of the disclosure, the housing part 20 comprises a housing body part 21 and a housing cover part 22.

[0038] The power part 10 penetrates the housing body part 21. The housing body 21 has an open front and a space part 29 formed therein. The housing body part 21 can, for example, have the form of a ring in which the front of the housing body part 21 is open, and can be penetrated by the power screw part 13 or the motor shaft of the power motor part 12.

[0039] The housing cover 22 is mounted on the housing body part 21 and prevents separation of the pressurized part 30 arranged in the space part 29. The housing cover 22 can, for example, be attached to the front of the housing body part 21 and surround part of the pressurized part 30 inserted into the space part 29.

[0040] Fig. Figure 6 is a view schematically showing a pressurized part according to one embodiment of the disclosure. Referring to Fig. 6, the pressurized part 30 according to an embodiment of the disclosure comprises a pressurized fluid part 31, a pressurized sealing part 32 and a pressurized airtight part 33.

[0041] The pressurized fluid component 31 fills the housing part 20. The pressurized fluid component 31 can, for example, be a fluid that fills the chamber 29 formed in the housing body part 21. The pressurized fluid component 31 can fill the housing body part 21 or be discharged from the housing body part 21 through a flow path formed in the housing body part 21 that can be opened or closed.

[0042] The sealing element 32 covers the pressurized fluid element 31, projects from the housing element 20, and presses the pressurized fluid element 31 against it by an external force. For example, the pressurized sealing element 32 can comprise a first sealing element 321, which is inserted into the chamber 29 formed in the housing element 21 and comes into close contact with the housing element 21, and a second sealing element 322, which is formed on the first sealing element 321, extends forward and projects from the housing element 20. The first sealing element 321 can be locked in place by the housing cover element 22, limiting its movement, and remain inserted in the housing element 21. The second sealing element 322 is exposed on one side without interfering with the housing cover element 22 and is pressurized by the reaction force of the power element 10.The second sealing part 322 can be pressurized onto the power bearing part 14 or onto the power piston part 15.

[0043] The airtight part 33 is mounted on the housing part 20 and comes into close contact with the pressurized sealing part 32 to block the leakage of the pressurized fluid part 31. For example, one or more pressurized airtight parts 33 can be located inside the housing body part 21 and come into close contact with the first sealing part 321 to prevent the leakage of the pressurized fluid part 31.

[0044] The pressurized part 30 according to one embodiment of the disclosure can further comprise a pressurized recovery part 34. The pressurized recovery part 34 is integrated into the housing part 20 and elastically supports the pressurized sealing part 32. For example, the pressurized recovery part 34 can have the form of a helical spring, and a plurality of pressurized recovery parts can support the first sealing part 321 and return the pressurized sealing part 32, from which the external force has been removed, to its original position.

[0045] Fig. Figure 7 is a view schematically showing a state in which a sensor part is installed in a longitudinal direction of a power part according to an embodiment of the disclosure, and Fig. Figure 8 is a view that schematically shows a state in which a sensor part is installed orthogonally in one direction to a power part according to an embodiment of the disclosure. With reference to the Fig. 7 and Fig. 8 The sensor part 40 is installed in the power part 10 according to one embodiment of the disclosure and connected to the housing part 20. The sensor part 40 can, for example, measure the pressure of the fluid that fills the housing body part 21 and can be arranged to have a length in the same direction as the length of the power screw part 13 (see Fig. 7), or can be arranged to have a length in a direction orthogonal to the length of the power screw part 13 (see Fig. 8) The sensor part 40 can be pressurized into the housing body part 21 and can remain directly connected to the housing body part 21. If the sensor part 40 is arranged horizontally in the longitudinal direction of the power screw part 13, it can be inserted into the rear of the housing body part 21 of the housing part 20 and remain connected to it. If the sensor part 40 is arranged orthogonally to the longitudinal direction of the power screw part 13, it can be inserted into the side of the housing body part 21 of the housing part 20 and remain connected to it. Such an arrangement of the sensor part 40 can vary depending on the shapes of the power part 10 and the housing part 20.

[0046] Fig. Figure 9 is a view that schematically represents a state in which a sensor part is arranged outside a power part according to an embodiment of the disclosure. Referring to Fig. 9 According to one embodiment of the disclosure, the sensor part 40 is arranged outside the power part 10 and connected to the housing part 20 built into the power part 10. For example, the sensor part 40 can be fixedly installed on the outside of the power part 10 and indirectly connected to the housing part 20 via a sensor flow path part 50.

[0047] The functioning of the sensor device for the electromechanical brake according to an embodiment of the disclosure, which has the structure described above, is described as follows.

[0048] When the pressurized fluid part 31 fills the chamber 29 formed in the housing body part 21, the chamber 29 is sealed by the pressurized sealing part 32, and the housing cover 22 is mounted on the housing body part 21, thus retaining the pressurized sealing part 32. Furthermore, the housing body part 21 is connected directly or indirectly to the sensor part 40.

[0049] The housing body part 21 is arranged 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.

[0050] When a brake pedal is actuated in the state described above, the power screw part 13 is rotated when the power motor part 12 is driven, and the power piston part 15 is moved by the power screw part 13. Accordingly, the brake pad presses against the disc formed on the wheel.

[0051] Meanwhile, the pressurized sealing element 32 is pressurized by the reaction force generated during the pressurization process of the power piston element 15. When the pressurized sealing element 32 is pressurized, the pressure of the liquid filling the chamber element 29 is increased uniformly.

[0052] Accordingly, the sensor part 40 measures the uniformly increased pressure of the fluid, even though it is connected to different points of the housing body part 21, and thus the measurement accuracy can be kept stable.

[0053] In the sensor device for the electromechanical brake according to an embodiment of the disclosure, the pressurized part 30 mounted on the housing part 20 ensures a uniform pressure when the power part 10 is driven, which makes it possible to keep the measuring accuracy of the sensor part 40 connected to the housing part 20 stable.

[0054] Although exemplary embodiments of the disclosure have been described for illustrative purposes, the person skilled in the art will recognize that various modifications, additions, and substitutions are possible without departing from the scope and spirit of the disclosure as defined in the appended claims. The actual technical scope of the disclosure should therefore be defined by the following claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 20180126288

[0008]

Claims

[1] Sensor device for an electromechanical brake, comprising: a power component configured to generate an actuating force for braking when power is applied to it; a housing part attached to the power section; a pressurized part that is attached to the housing part and is pressurized by a reaction force caused by driving the power part; and a sensor part that is connected to the housing part and configured to detect a pressure force through the pressurized part. [2] Sensor device for the electromechanical brake according to claim 1, wherein the power part comprises: a performance body part; a power motor component that is attached to the power body component and is driven when power is applied to it; a power screw part that is attached to the power body part and is rotated by the power motor part; a power bearing component configured to support the power screw component; and a power piston part that moves in a straight line when the power screw part is rotated. [3] Sensor device for the electromechanical brake according to claim 2, wherein the housing part and the pressurized part are arranged between the power bearing part and the power body part and the pressurized part is pressurized by the reaction force of the power bearing part. [4] Sensor device for the electromechanical brake according to claim 2, wherein the housing part and the pressurized part are arranged between the power piston part and a power nut part, wherein the power nut part is moved in a straight line by the power screw part and is configured to move the power piston part, and wherein the pressurized part is pressurized by the reaction force of the power piston part. [5] Sensor device for the electromechanical brake according to one of claims 1 to 4, wherein the housing part comprises: a housing body part that is penetrated by the power part and has an open front and a space formed therein; and a housing cover part that is attached to the housing body part and is configured to prevent separation of the pressurized part located in the space part. [6] Sensor device for the electromechanical brake according to one of claims 1 to 5, wherein the pressurized part comprises: a pressurized fluid component designed to fill the housing component; a pressurized sealing element projecting from the housing element and configured to cover the pressurized fluid element and to pressurize the fluid element by an external force; and a pressurized airtight part that is attached to the housing part, comes into close contact with the pressurized sealing part and is configured to block leakage of the pressurized fluid part. [7] Sensor device for the electromechanical brake according to claim 6, wherein the pressurized fluid part fills the housing part or is drained from the housing part by means of a flow path formed on the housing part that can be opened and closed. [8] Sensor device for the electromechanical brake according to claim 6 or 7, wherein the pressurized sealing part comprises: a first sealing element that is inserted into the housing element, its movement being limited, and that is configured to cover the pressurized fluid portion; and a second sealing part formed on the first sealing part, which protrudes from the housing part and is pressurized by the reaction force of the power part. [9] Sensor device for the electromechanical brake according to one of claims 6 to 8, wherein the pressurized part further comprises a pressurized recovery part which is installed in the housing part and configured to elastically support the pressurized sealing part. [10] Sensor device for the electromechanical brake according to one of claims 1 to 9, wherein the sensor part is installed in the power part and connected to the housing part. [11] Sensor device for the electromechanical brake according to one of claims 1 to 10, wherein the sensor part is inserted into a rear side of the housing part and remains connected to the housing part. [12] Sensor device for the electromechanical brake according to one of claims 1 to 11, wherein the sensor part is inserted into a side of the housing part and remains connected to the housing part. [13] Sensor device for the electromechanical brake according to one of claims 1 to 12, wherein the sensor part is arranged outside the power part and is connected to the housing part built into the power part by a sensor flow path part.

Images