Electronic mechanical brake

Abstract

The utility model discloses an electronic mechanical brake which comprises a support assembly, a caliper body assembly and an MGU assembly, the caliper body assembly comprises a cylinder body, a bearing piece fixedly arranged in the cylinder body, a movable caliper body arranged in the cylinder body in a sliding mode and a driving assembly driving the movable caliper body to slide, the driving assembly is arranged in the cylinder body in a rotating mode, and the driving assembly is matched with or connected with the movable caliper body. The MGU assembly is matched with or connected with the driving assembly; the caliper body assembly further comprises a thrust bearing arranged between the driving assembly and the bearing piece, the thrust bearing comprises a retainer and roller mechanisms arranged on the retainer, the roller mechanisms are arranged in multiple layers in the radial direction of the retainer, and each layer of roller mechanism comprises multiple rollers arranged in an annular shape. And the central axis of each roller extends along the radial direction of the retainer. The electronic mechanical brake is small in friction loss and high in transmission efficiency in the application process.

Description

Technical Field

[0001] This utility model relates to the field of vehicle braking equipment technology, specifically to an electromechanical brake. Background Technology

[0002] Electromechanical brakes (EMBs) are a type of brake-by-wire system, characterized by rapid response and superior performance. Compared to traditional hydraulic braking systems, they eliminate the need for hydraulic lines and brake wheel cylinders, thus solving the environmental pollution problem associated with hydraulic oil and simplifying the braking system structure, which is beneficial for optimizing vehicle chassis layout. With the accelerated deployment of EMB products, their application in vehicles is expanding, posing greater challenges to their performance. Current EMB technologies suffer from high friction losses and low transmission efficiency. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an electromechanical brake with low friction loss and high transmission efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An electromechanical brake includes a bracket assembly, a clamp assembly mounted on the bracket assembly, and an MGU assembly mounted on the clamp assembly. The clamp assembly includes a cylinder, a carrier fixedly mounted in the cylinder, a movable clamp body slidably mounted in the cylinder, and a drive assembly for driving the movable clamp body to slide. The drive assembly is rotatably mounted in the cylinder and cooperates with or connects to the movable clamp body. The MGU assembly cooperates with or connects to the drive assembly to drive the drive assembly to rotate. The clamp assembly further includes a thrust bearing disposed between the drive assembly and the carrier. The thrust bearing includes a cage and a roller mechanism mounted on the cage. The roller mechanism has multiple layers arranged along the radial direction of the cage. Each layer of the roller mechanism includes multiple rollers arranged in a ring, and the central axis of each roller extends along the radial direction of the cage.

[0006] In some embodiments, the roller mechanism is provided with a single layer or multiple layers along the axial direction of the cage.

[0007] In some embodiments, there is a spacing between two adjacent layers of the roller mechanism along the radial direction of the cage.

[0008] In some embodiments, in two adjacent layers of the roller mechanism, the number of rollers contained in the outer roller mechanism is not less than the number of rollers contained in the inner roller mechanism.

[0009] In some embodiments, all the rollers are identical, and the number of rollers included in the outer roller mechanism is greater than the number of rollers included in the inner roller mechanism.

[0010] In some embodiments, adjacent layers of the roller mechanism are staggered.

[0011] In some embodiments, the stagger distance between two adjacent layers of the roller mechanism is no greater than 50% of the shortest roller length.

[0012] In some embodiments, the thrust bearing further includes bearing washers disposed on one side of the cage in the axial direction, or the bearing washers are disposed on opposite sides of the cage in the axial direction.

[0013] In some embodiments, the cage is an integral structure, and the roller mechanisms of each layer are all disposed on the same cage;

[0014] Alternatively, the cage may include a plurality of separate cages arranged sequentially in the radial direction, with each layer of the roller mechanism corresponding to one of the separate cages.

[0015] In some embodiments, the drive assembly includes a rotating rod rotatably disposed in the cylinder body and a connecting member fixedly connected to or integrally disposed with the rotating rod. The connecting member is screwed to the moving clamp body. The rotating rod is connected to or engaged with the MGU assembly. The thrust bearing is disposed between the rotating rod and the bearing member.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: In the electromechanical brake of this utility model, a multi-layer roller mechanism is arranged along the radial direction of the cage, which can reduce the length of the rollers of the thrust bearing, making the frictional torque of the thrust bearing smaller, thereby reducing the frictional loss of the electromechanical brake during application, improving the transmission efficiency, and making the output performance of the electromechanical brake better. Attached Figure Description

[0017] Appendix Figure 1 This is a three-dimensional schematic diagram of the electromechanical brake in this embodiment;

[0018] Appendix Figure 2 This is a front view schematic diagram of the electromechanical brake in this embodiment;

[0019] Appendix Figure 3 This is a top view of the electromechanical brake in this embodiment;

[0020] Appendix Figure 4 For the appendix Figure 3 sectional view along line AA;

[0021] Appendix Figure 5 This is one of the structural schematic diagrams showing the arrangement of the multi-layer roller mechanism on the cage in this embodiment;

[0022] Appendix Figure 6 This is the second schematic diagram of the structure of the multi-layer roller mechanism in this embodiment, showing its arrangement on the cage.

[0023] Appendix Figure 7 This is one of the structural schematic diagrams of the thrust bearing in this embodiment;

[0024] Appendix Figure 8 This is the second schematic diagram of the thrust bearing in this embodiment;

[0025] Appendix Figure 9 This is the third schematic diagram of the thrust bearing in this embodiment.

[0026] The components are: 1. Bracket assembly; 2. Clamp body assembly; 21. Cylinder block; 22. Bearing component; 23. Moving clamp body; 24. Rotating rod; 25. Connecting component; 26. Thrust bearing; 261. Cage; 262. Roller; 263. Bearing gasket; 3. MGU assembly. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a full understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present utility model. Therefore, the present utility model is not limited to the specific embodiments disclosed below.

[0028] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] like Figures 1-4 As shown, the electromechanical brake of this utility model includes a bracket assembly 1, a clamp body assembly 2 disposed on the bracket assembly 1, and an MGU assembly 3 disposed on the clamp body assembly 2.

[0034] like Figure 4 As shown, the clamp assembly 2 includes a cylinder 21, a carrier 22, a moving clamp 23, and a drive assembly.

[0035] The cylinder body 21 is fixedly mounted on the bracket assembly 1, and the cylinder body 21 has a hollow cavity.

[0036] The support member 22 is fixedly installed inside the cavity of the cylinder body 21. When the brake is working, the support member 22 mainly bears the axial load. The support member 22 can be installed separately from the cylinder body 21 and fixedly connected inside the cylinder body 21. Alternatively, the support member 22 can be integrally installed with the cylinder body 21.

[0037] The movable clamp 23 is slidably disposed within the cavity of the cylinder 21.

[0038] The drive assembly is engaged or connected with the movable clamp 23. The drive assembly is rotatably disposed within the cavity of the cylinder 21. When the drive assembly rotates, it drives the movable clamp 23 to slide within the cavity of the cylinder 21.

[0039] The drive assembly includes a rotating rod 24 and a connecting member 25. The rotating rod 24 is rotatably mounted within the cavity of the cylinder body 21, and the connecting member 25 is fixedly connected to or integrally mounted with the rotating rod 24. The connecting member 25 mates with or connects to the moving clamp body 23, and the MGU assembly 3 mates with or connects to the rotating rod 24.

[0040] The MGU assembly 3 serves as a power source, driving the rotating rod 24 to rotate within the cavity of the cylinder 21. This rotation causes the connecting piece 25 to rotate synchronously. Through the cooperation or connection between the connecting piece 25 and the moving clamp 23, the moving clamp 23 is driven to slide relative to the cylinder 21. The MGU assembly 3 can adopt a structure found in existing technologies.

[0041] In this embodiment, the connecting member 25 and the movable clamp body 23 are connected by a screw engagement, which can be a ball screw engagement or a threaded engagement. A limit structure is provided between the movable clamp body 23 and the cylinder body 21 to limit the rotation of the movable clamp body 23, so that when the connecting member 25 rotates, the movable clamp body 23 can only move linearly in the axial direction.

[0042] Other mating or connection methods can also be used between the connector 25 and the moving clamp body 23, such as the mating method of gears and racks.

[0043] A thrust bearing 26 is provided between the rotating rod 24 and the bearing member 22. When the brake is working, the rotating rod 24 rotates relative to the cylinder 21. The thrust bearing 26 bears the low-speed rotation and axial force. By providing the thrust bearing 26, the friction loss between the rotating rod 24 and the bearing member 22 can be reduced.

[0044] like Figures 5-9 As shown, the thrust bearing 26 includes a cage 261 and a roller mechanism disposed on the cage 261. The roller mechanism includes a plurality of rollers 262 arranged in a ring, and the central axis of each roller 262 extends along the radial direction of the cage 261.

[0045] The roller mechanism has multiple layers arranged along the radial direction of the cage 261, and the diameter of the rollers 262 in each layer of the roller mechanism is the same. This reduces the length of the rollers 262, resulting in a smaller frictional torque of the thrust bearing, thereby reducing frictional losses in the brake during application, improving transmission efficiency, and enhancing the output performance of the brake.

[0046] The roller mechanism can be provided in a single layer or multiple layers along the axial direction of the cage 261. Preferably, the roller mechanism is provided in a single layer along the axial direction of the cage 261, which simplifies the structure of the thrust bearing.

[0047] There are various ways to arrange the multi-layer roller mechanism on the cage 261. This embodiment provides two specific arrangement forms.

[0048] In one configuration, along the radial direction of the cage 261, there is a spacing between adjacent layers of roller mechanisms, such as... Figure 5 As shown.

[0049] In this configuration, in two adjacent rolling mechanisms, the number of rollers 262 in the outer rolling mechanism is no less than the number of rollers 262 in the inner rolling mechanism. Specifically: when the rollers 262 in each rolling mechanism are identical, the number of rollers 262 in the outer rolling mechanism is greater than the number of rollers 262 in the inner rolling mechanism. When the lengths of the rollers 262 in each rolling mechanism are different, the number of rollers 262 in the outer rolling mechanism can be greater than the number of rollers 262 in the inner rolling mechanism, and the number of rollers 262 in the outer rolling mechanism can also be the same as the number of rollers 262 in the inner rolling mechanism.

[0050] In another configuration, adjacent layers of roller mechanisms are staggered, such as... Figure 6 As shown.

[0051] In this configuration, each roller 262 in each layer of the roller mechanism can be exactly the same, or the length of the roller 262 in different layers of the roller mechanism can also be set to be different.

[0052] Preferably, the stagger distance between two adjacent roller mechanisms is no more than 50% of the length of the shortest roller 262. This makes the length of roller 262 relatively small, thereby reducing friction loss during brake operation.

[0053] The cage 261 can be an integral structure, so that all layers of roller mechanisms are mounted on the same cage 261.

[0054] When there is a gap between two adjacent layers of roller mechanisms, the cage 261 can also be configured as a split structure. Specifically, the cage 261 includes multiple split cages arranged sequentially in the radial direction, with adjacent split cages connected to each other, and each layer of roller mechanism is correspondingly arranged on one split cage.

[0055] The thrust bearing may also include a bearing gasket 263, which may be omitted during use, such as... Figure 7 As shown. Alternatively, a bearing washer 263 may be provided only on one side of the cage 261 in the axial direction, such as... Figure 4 and Figure 8 As shown, the bearing gasket 263 is positioned on the side of the cage 261 that bears the axial load, as... Figure 4 As shown. Alternatively, bearing washers 263 can be provided on both opposite sides of the cage 261 in the axial direction, as shown. Figure 9 As shown.

[0056] The working principle of this electromechanical brake is as follows:

[0057] When the electromechanical brake is engaged, the MGU assembly 3 starts, providing power to drive the rotating rod 24 to rotate, which in turn drives the connecting piece 25 to rotate synchronously. Through the threaded connection between the connecting piece 25 and the moving caliper body 23, the moving caliper body 23 is driven to slide relative to the cylinder body 21. When the moving caliper body 23 slides, it drives the brake disc or friction pads to move, thereby achieving braking.

[0058] During braking, the thrust bearing 26 bears axial load. The structure of the thrust bearing in this application can reduce the friction loss of the brake during application, improve the transmission efficiency, and make the output performance of the brake better.

[0059] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An electromechanical brake, comprising a bracket assembly, a clamp assembly disposed on the bracket assembly, and an MGU assembly disposed on the clamp assembly, characterized in that: The clamp assembly includes a cylinder, a carrier fixedly disposed within the cylinder, a movable clamp body slidably disposed within the cylinder, and a drive assembly for driving the movable clamp body to slide. The drive assembly is rotatably disposed within the cylinder and cooperates with or connects to the movable clamp body. The MGU assembly cooperates with or connects to the drive assembly to drive the drive assembly to rotate. The drive assembly cooperates with or connects to the movable clamp body. The clamp assembly also includes a thrust bearing disposed between the drive assembly and the carrier. The thrust bearing includes a cage and a roller mechanism disposed on the cage. The roller mechanism has multiple layers arranged along the radial direction of the cage. Each layer of the roller mechanism includes multiple rollers arranged in a ring. The central axis of each roller extends along the radial direction of the cage.

2. The electromechanical brake according to claim 1, characterized in that: The roller mechanism is provided in one or more layers along the axial direction of the cage.

3. The electromechanical brake according to claim 1, characterized in that: Along the radial direction of the cage, there is a spacing between two adjacent layers of the roller mechanism.

4. The electromechanical brake according to claim 3, characterized in that: In two adjacent layers of roller mechanisms, the number of rollers contained in the outer roller mechanism is not less than the number of rollers contained in the inner roller mechanism.

5. The electromechanical brake according to claim 4, characterized in that: All the rollers are identical, but the outer roller mechanism contains a greater number of rollers than the inner roller mechanism.

6. The electromechanical brake according to claim 1, characterized in that: The roller mechanisms in adjacent layers are staggered.

7. The electromechanical brake according to claim 6, characterized in that: The stagger distance between two adjacent layers of the roller mechanism is no greater than 50% of the shortest roller length.

8. The electromechanical brake according to claim 1, characterized in that: The thrust bearing further includes bearing shims, which are disposed on one side of the cage in the axial direction, or the bearing shims are disposed on opposite sides of the cage in the axial direction.

9. The electromechanical brake according to claim 1, characterized in that: The cage is an integral structure, and the roller mechanisms of each layer are all mounted on the same cage; Alternatively, the cage may include a plurality of separate cages arranged sequentially in the radial direction, with each layer of the roller mechanism corresponding to one of the separate cages.

10. The electromechanical brake according to claim 1, characterized in that: The drive assembly includes a rotating rod rotatably disposed within the cylinder body and a connecting member fixedly connected to or integrally disposed with the rotating rod. The connecting member is screwed into the moving clamp body. The rotating rod is connected to or engaged with the MGU assembly, and the thrust bearing is disposed between the rotating rod and the bearing member.

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