EMB brake and vehicle

Abstract

The utility model relates to the technical field of vehicle engineering, and provides an EMB brake and a vehicle. The two brake pads are arranged in the first direction in a spaced mode and comprise the first state in which the two brake pads abut against each other and the second state in which the two brake pads are away from each other. The transmission assembly comprises a lead screw and a nut, the axis of the lead screw is parallel to the first direction, the nut is fixed to one brake pad, one end of the axis of the lead screw is inserted into the nut and movably connected with the nut, and when the lead screw rotates, the nut can be driven to move in the first direction so as to switch a first state and a second state; the axial end face of the lead screw can abut against the nut in the axial direction, and the abutting face is an arc face. The motor is used for driving the lead screw to rotate. In this way, the problem that accurate control cannot be achieved due to the fact that current is increased when the motor is started due to excessive reset of the nut can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle engineering, in particular to an EMB brake and a vehicle. Background Art

[0002] An EMB (Electro-Mechanical Brake) is a mechatronic brake. It primarily consists of a motor, transmission, and brake pads. The working principle is that the motor drives the transmission, creating friction between the brake pads and the brake disc, thereby slowing or stopping the vehicle. Compared to traditional hydraulic brakes, it offers more precise braking force control and faster response.

[0003] Generally, the transmission device is a screw structure, but in the process of rotating the screw, over-reset is prone to occur, that is, when the brake pads move away from each other, the screw rotates too fast or rotates too many times, causing it to move further to the side away from the brake pads, causing the nut and the screw to abut axially. According to the formula, F=μN, where μ is the friction coefficient, N is the pressure, and F is the friction force. At this time, due to the increase in the abutment force, that is, the pressure N, the friction between the nut and the screw increases. When the brake pads need to be pressed tightly, the excessive friction increases the starting current of the motor, increases the mechanical shock, and is not conducive to the precise control of the motor.

[0004] Therefore, there is an urgent need for an EMB brake and a vehicle to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide an EMB brake and a vehicle, which can reduce the problem of increased current during motor startup due to excessive resetting of the nut, and the inability to accurately control the current.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] EMB brakes, including:

[0008] Brake pads, wherein two brake pads are provided, and the two brake pads are spaced apart in a first direction, including a first state of abutting each other and a second state of being spaced apart from each other;

[0009] A transmission assembly, the transmission assembly comprising a screw and a nut, the axis of the screw being parallel to the first direction, the nut being fixed to one of the brake pads, one end of the axis of the screw being inserted into the nut and movably connected to the nut, and when the screw rotates, the nut can be driven to move along the first direction to switch between the first state and the second state, and the axial end surface of the screw can abut against the nut along the axial direction, and the abutting surface is a circular arc surface;

[0010] The motor is used to drive the screw to rotate.

[0011] As a preferred technical solution of the above-mentioned EMB brake, the above-mentioned transmission assembly also includes a transmission roller and a retaining frame. There are multiple transmission rollers, and the multiple transmission rollers are parallel to the above-mentioned screw and distributed around the axis of the above-mentioned screw. The multiple transmission rollers are threadedly connected to the above-mentioned screw, and the multiple transmission rollers are rotatably connected to the above-mentioned retaining frame. The above-mentioned retaining frame is at least partially inserted in the above-mentioned nut for driving the above-mentioned nut to move in the above-mentioned first direction.

[0012] As an optimal technical solution for the above-mentioned EMB brake, the above-mentioned screw rod includes a rod body and an insert, the above-mentioned insert is detachably connected to the above-mentioned rod body, and the above-mentioned arc surface is provided on the side of the above-mentioned insert facing away from the above-mentioned rod body, which can abut against the above-mentioned nut in the above-mentioned first direction.

[0013] As a preferred technical solution of the above-mentioned EMB brake, the above-mentioned insert is a metal part.

[0014] As an optimal technical solution for the above-mentioned EMB brake, it also includes a caliper body and a positioning pin. The above-mentioned transmission assembly is at least partially located in the above-mentioned caliper body. The outer peripheral wall of the above-mentioned nut is provided with a first limiting groove. The above-mentioned positioning pin is inserted into the above-mentioned nut and inserted in the above-mentioned first limiting groove. The above-mentioned nut and the above-mentioned positioning pin can slide relative to each other in the above-mentioned first direction.

[0015] As a preferred technical solution of the above-mentioned EMB brake, the above-mentioned caliper body forms an annular plug-in portion on the circumferential side of the above-mentioned screw rod, and the above-mentioned plug-in portion is plugged into and sealed with the housing of the above-mentioned motor.

[0016] As an optimal technical solution for the above-mentioned EMB brake, the above-mentioned caliper body is provided with a second limiting groove in the above-mentioned first direction, and the above-mentioned positioning pin can be inserted into the above-mentioned second limiting groove and the above-mentioned first limiting groove from the side where the above-mentioned motor is located, and the above-mentioned positioning pin is located on the inner side of the above-mentioned plug-in part.

[0017] As a preferred technical solution of the above-mentioned EMB brake, the above-mentioned positioning pin is interference-fitted with the above-mentioned first limiting groove and / or the above-mentioned second limiting groove.

[0018] As a preferred technical solution of the above-mentioned EMB brake, the above-mentioned screw rod is connected to the above-mentioned caliper body through a self-lubricating washer and a rubber washer.

[0019] A vehicle is also provided, comprising the above-mentioned EMB brake.

[0020] Beneficial effects of the utility model:

[0021] An EMB brake is provided, comprising a brake pad, a transmission assembly, and a motor. Two brake pads are provided, spaced apart in a first direction, and include a first state in which they abut against each other and a second state in which they are spaced apart from each other. The transmission assembly includes a screw and a nut, the axis of the screw being parallel to the first direction, the nut being fixed to one of the brake pads, one end of the screw axis being inserted into the nut and movably connected to the nut. When the screw rotates, the nut can be driven to move in the first direction to switch between the first and second states. The axial end face of the screw can abut against the nut axially, and the abutting surface is an arc surface. The motor is used to drive the screw to rotate. By rotating the screw, the nut can be driven to move in the first direction, driving the brake pad to switch between the first and second states. The end of the screw that abuts the nut is an arc surface, so that the contact surface between the screw and the nut approaches point contact. By reducing the contact area, the friction coefficient μ is reduced, thereby reducing the friction force F, allowing the motor to start smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of the EMB brake provided by an embodiment of the utility model.

[0024] In the picture:

[0025] X, first direction;

[0026] 211, rod body; 2111, spherical surface; 212, insert; 220, nut; 230, transmission roller; 240, cage;

[0027] 300, clamp body;

[0028] 400, positioning pin;

[0029] 510, self-lubricating washer; 520, rubber washer; 530, O-ring;

[0030] 610, needle roller bearing; 620, bearing washer; 700, force sensor;

[0031] 800. Circlip for shaft. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0033] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0036] like Figure 1As shown, the present invention provides an EMB brake, comprising a brake pad, a transmission assembly, and a motor. Two brake pads are provided, spaced apart in a first direction X, and configured in a first state in which they abut against each other and a second state in which they are spaced apart from each other. The transmission assembly comprises a screw and a nut 220, the axis of the screw being parallel to the first direction X. The nut 220 is fixed to one of the brake pads, and one end of the screw axis is inserted into and movably connected to the nut 220. When the screw rotates, it drives the nut 220 to move in the first direction X, switching between the first and second states. The axial end face of the screw can abut against the nut 220 along the axial direction, and the abutting surface is an arc surface. The motor is used to drive the screw to rotate.

[0037] In this way, by rotating the screw, the nut 220 can be driven to move along the first direction X, driving the brake pad to switch between the first state and the second state. Since over-reset is easy to occur during the process of rotating the screw, that is, when the brake pad switches from the first state to the second state, the screw rotates too fast or rotates too many times, causing it to move further away from the brake pad, causing the nut 220 to abut against the screw in the first direction X. According to the formula, F = μN, where μ is the friction coefficient, N is the pressure, and F is the friction force. At this time, due to the increase in the abutment force, i.e., the pressure N, the friction force between the nut 220 and the screw increases. When the brake pad needs to switch from the second state to the first state, the excessive friction force increases the starting current of the motor, increases mechanical shock, and is not conducive to the precise control of the motor. To this end, in this embodiment, the end of the screw that can abut against the nut 220 is a circular arc surface, so that the contact surface between the screw and the nut 220 approaches point contact. By reducing the contact area, the friction coefficient μ is reduced, and the friction force F is reduced, so that the motor can start smoothly.

[0038] Optionally, the transmission assembly also includes a transmission roller 230 and a retaining frame 240. A plurality of transmission rollers 230 are provided, and the plurality of transmission rollers 230 are parallel to the screw and distributed around the axis of the screw. The plurality of transmission rollers 230 are threadedly connected to the screw, and the plurality of transmission rollers 230 are rotatably connected to the retaining frame 240. The retaining frame 240 is at least partially inserted into the nut 220 for driving the nut 220 to move in the first direction X.

[0039] Specifically, the transmission assembly forms a differential planetary roller screw model. When the central screw rotates, it drives the peripheral transmission rollers 230 to rotate and orbit around the screw. The transmission rollers 230 drive the retaining frame 240 to move in the first direction X, which in turn drives the nut 220 to move in the first direction X, thereby completing the reciprocating movement of the brake pad between the first and second states. Compared to conventional ball screws, differential planetary roller screws offer significant advantages. They offer a higher load capacity because multiple rollers simultaneously carry the load, and they also offer high precision, enabling high-precision linear motion. This type of screw is typically used in applications requiring high precision and load capacity.

[0040] Optionally, the screw rod includes a rod body 211 and an insert 212 , the insert 212 is detachably connected to the rod body 211 , and a circular arc surface is provided on a side of the insert 212 facing away from the rod body 211 , which can abut against the nut 220 in the first direction X.

[0041] The insert 212 and the nut 220 abut against each other in the first direction X and rub against each other. After multiple frictions, the arc surface of the insert 212 gradually wears away, and the contact area between the insert 212 and the nut 220 gradually increases. In this way, the insert 212 and the rod body 211 are designed to be detachable. It is only necessary to remove the insert 212 from the rod body 211 and replace it, without replacing the entire screw rod.

[0042] Optionally, the insert 212 is a metal part. Generally, metal parts have relatively good wear resistance, thus extending the service life of the insert 212.

[0043] Optionally, the EMB brake also includes a caliper body 300 and a positioning pin 400, the transmission assembly is at least partially located in the caliper body 300, the outer peripheral wall of the nut 220 is provided with a first limiting groove, the positioning pin 400 is inserted in the nut 220 and inserted in the first limiting groove, and the nut 220 and the positioning pin 400 can slide relative to each other in the first direction X.

[0044] Exemplarily, the first limiting groove is opened along the first direction X, and the positioning pin 400 is inserted into the first limiting groove, which limits the relative rotation of the nut 220 and the caliper body 300 and regulates the movement path of the nut 220 along the first direction X.

[0045] Optionally, the clamp body 300 forms an annular plug-in portion on the circumference of the screw rod, and the plug-in portion is plugged into and sealed with the housing of the motor.

[0046] Exemplarily, the plug-in portion is sleeved with an O-ring 530 , which is sandwiched between the caliper body 300 and the housing of the motor to form a seal.

[0047] Optionally, the clamp body 300 is provided with a second limiting groove in the first direction X, and the positioning pin 400 can be inserted into the second limiting groove and the first limiting groove from the side where the motor is located, and the positioning pin 400 is located on the inner side of the plug-in portion.

[0048] Exemplarily, the nut 220 is provided with a first limiting groove along the first direction X, and one of the openings of the first limiting groove is formed on the end surface of the nut 220 facing the motor, and the other opening is formed on the peripheral side wall of the nut 220; the caliper body 300 is provided with a second limiting groove along the first direction X, and one of the openings of the second limiting groove is formed on the end surface of the nut 220 facing the motor, and the other opening is formed on the inner peripheral wall of the caliper body 300, and the positioning pin 400 can be inserted into the first limiting groove and the second limiting groove along the first direction X from the side where the motor is located, thereby limiting the relative rotation between the nut 220 and the caliper body 300 and regulating the movement path of the nut 220 in the first direction X. The positioning pin 400 is located on the inner side of the plug-in portion and can complete the sealing of the first limiting groove and the second limiting groove with the help of the sealing structure between the plug-in portion and the housing of the motor.

[0049] Furthermore, the positioning pin 400 is interference-fitted with the first limiting groove and / or the second limiting groove to form a sealing effect.

[0050] Optionally, the screw rod is connected to the caliper body 300 via a self-lubricating washer 510 and a rubber washer 520 .

[0051] For example, the caliper body 300 has a mounting hole, one axial end of the screw is inserted into the mounting hole, a self-lubricating washer 510 is mounted on the axial end surface of the mounting hole and sleeved on the outer circumference of the screw, and a rubber washer 520 is sleeved on the outside of the screw and connected to the self-lubricating washer 510. Furthermore, the self-lubricating washer 510 is made of PTFE, and its main function is to reduce the friction torque of the screw. The rubber washer 520 has a certain amount of compression, which can eliminate the installation gap of the screw.

[0052] Furthermore, the rubber elastic body of the rubber gasket 520 and its metal frame are integrally vulcanized.

[0053] Optionally, in order to ensure that the screw rod transmits force to the needle bearing 610 evenly and reduce the force value deviation of the force sensor 700, the bearing washer 620 and the screw rod are in contact with each other using a spherical surface 2111.

[0054] Optionally, the shaft retaining ring 800 is sleeved on the screw rod, and the self-lubricating washer 510 and the rubber washer 520 are sandwiched between the shaft retaining ring 800 and the caliper body 300 .

[0055] A vehicle is also provided, comprising the above-mentioned EMB brake.

[0056] Furthermore, the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. EMB brake, characterized in that: include: Brake pads, wherein two brake pads are provided, and the two brake pads are spaced apart in a first direction (X), including a first state of abutting each other and a second state of being spaced apart from each other; A transmission assembly, the transmission assembly comprising a screw and a nut (220), the axis of the screw being parallel to the first direction (X), the nut (220) being fixed to one of the brake pads, one end of the axis of the screw being inserted into the nut (220) and movably connected to the nut (220), and when the screw rotates, the nut (220) can be driven to move along the first direction (X) to switch between the first state and the second state, and the axial end face of the screw can abut against the nut (220) along the axial direction, and the abutting face is an arc surface; A motor is used to drive the screw to rotate.

2. The EMB brake according to claim 1, characterized in that The transmission assembly further includes a transmission roller (230) and a retaining frame (240), wherein a plurality of the transmission rollers (230) are provided, and the plurality of transmission rollers (230) are all parallel to the screw and distributed around the axis of the screw, and the plurality of transmission rollers (230) are threadedly connected to the screw, and the plurality of transmission rollers (230) are all rotationally connected to the retaining frame (240), and the retaining frame (240) is at least partially inserted into the nut (220) for driving the nut (220) to move in the first direction (X).

3. The EMB brake according to claim 2, characterized in that: The screw rod comprises a rod body (211) and an insert (212), wherein the insert (212) is detachably connected to the rod body (211), and the insert (212) is provided with the arc surface on the side facing away from the rod body (211), capable of abutting against the nut (220) in the first direction (X).

4. The EMB brake according to claim 3, characterized in that The insert (212) is a metal part.

5. The EMB brake according to claim 1, characterized in that The invention also includes a caliper body (300) and a positioning pin (400), wherein the transmission assembly is at least partially located in the caliper body (300), the outer peripheral wall of the nut (220) is provided with a first limiting groove, the positioning pin (400) is inserted into the nut (220) and inserted into the first limiting groove, and the nut (220) and the positioning pin (400) can slide relative to each other in the first direction (X).

6. The EMB brake according to claim 5, characterized in that The clamp body (300) forms an annular plug-in portion on the peripheral side of the screw rod, and the plug-in portion is plugged into and sealed with the housing of the motor.

7. The EMB brake according to claim 6, characterized in that The clamp body (300) is provided with a second limiting groove in the first direction (X), and the positioning pin (400) can be inserted into the second limiting groove and the first limiting groove from the side where the motor is located, and the positioning pin (400) is located on the inner side of the plug-in portion.

8. The EMB brake according to claim 7, characterized in that The positioning pin (400) is interference-fitted with the first limiting groove and / or the second limiting groove.

9. The EMB brake according to any one of claims 5 to 8, characterized in that: The screw rod is connected to the caliper body (300) via a self-lubricating washer (510) and a rubber washer (520).

10. A vehicle, characterized in that The EMB brake comprises the EMB brake according to any one of claims 1 to 9.

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