Brake caliper and electronic mechanical brake with same

Abstract

The brake caliper comprises a caliper body with a cavity, a piston arranged in the cavity of the caliper body in a sliding mode and a driving shaft driving the piston to slide in the cavity of the caliper body, and the driving shaft is arranged in the cavity of the caliper body in a rotating mode. The brake caliper further comprises a pre-tightening mechanism used for eliminating the axial installation gap of the driving shaft, one end of the driving shaft extends out of the cavity of the caliper body, the pre-tightening mechanism comprises a nut and an elastic piece, the nut is connected to the portion, extending out of the cavity of the caliper body, of the driving shaft through threads, and the elastic piece is arranged on the nut. The axial position of the nut on the driving shaft can be adjusted according to the axial installation gap of the driving shaft, and the elastic piece is arranged outside the cavity of the caliper body and arranged between the nut and the caliper body in an abutting mode. According to the brake caliper, the mounting clearance in the brake can be stably and reliably eliminated through the pre-tightening mechanism, so that the state consistency of a plurality of parts after assembly is improved, and the performance stability of the electronic mechanical brake is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle brake equipment technical field, concretely relates to a brake caliper and electronic mechanical brake with it. BACKGROUND

[0002] The electronic mechanical brake belongs to one kind of line control brake, and its response is rapid and performance is superior, compared with the traditional hydraulic brake system, the hydraulic oil pipeline and brake wheel cylinder and other components are omitted, the environmental pollution problem of hydraulic oil is solved, and the brake system structure is simplified, which is beneficial to optimizing the chassis structure arrangement of the vehicle.

[0003] The line control brake pursues the ultimate safety and response, and the electronic mechanical brake is an electromechanical product, and there is a certain gap tolerance between mechanical components, which can lead to inconsistent part states and long working stroke, directly affecting the response performance of the product, and even producing abnormal sound. UTILITY MODEL CONTENTS

[0004] The utility model aims at the deficiency in prior art, and provides a brake caliper capable of eliminating the installation gap in the brake.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] A brake caliper, comprising a caliper body with a cavity, a piston slidably arranged in the cavity of the caliper body, and a drive shaft for driving the piston to slide in the cavity of the caliper body, the drive shaft is rotatably arranged in the cavity of the caliper body, the brake caliper further comprises a pre-tightening mechanism for eliminating the axial installation gap of the drive shaft, one end of the drive shaft extends out of the cavity of the caliper body, the pre-tightening mechanism comprises a nut and an elastic piece, the nut is connected on the part of the drive shaft extending out of the cavity of the caliper body through thread, and the axial position of the nut on the drive shaft can be adjusted according to the axial installation gap of the drive shaft, and the elastic piece is arranged outside the cavity of the caliper body and abuts between the nut and the caliper body.

[0007] In some embodiments, the part of the drive shaft extending out of the cavity of the caliper body comprises a first connecting part connected with the MGU assembly and a second connecting part connected with the nut, the first connecting part and the second connecting part are sequentially arranged from outside to inside, an outer thread connected with the nut is arranged on the outer circumferential surface of the second connecting part, and the diameter of the second connecting part is greater than that of the first connecting part.

[0008] In some embodiments, the pre-tightening mechanism further comprises a first thrust bearing arranged on the caliper body, the first thrust bearing is coaxially arranged with the drive shaft, the first thrust bearing is located outside the cavity of the caliper body, and the elastic member is arranged between the nut and the first thrust bearing.

[0009] In some embodiments, the first thrust bearing is a rolling bearing.

[0010] In some embodiments, the elastic member is a disc spring, a wave spring or a coil spring.

[0011] In some embodiments, a positioning portion is arranged on the drive shaft, the positioning portion is located inside the cavity of the caliper body, the pre-tightening mechanism further comprises a second thrust bearing arranged on the drive shaft, the second thrust bearing is located inside the cavity of the caliper body and arranged between the positioning portion and the top of the cavity of the caliper body in the axial direction.

[0012] In some embodiments, the pre-tightening mechanism further comprises a carrier arranged at the top of the cavity of the caliper body, the carrier is sleeved on the drive shaft, and the second thrust bearing is arranged between the positioning portion and the carrier.

[0013] In some embodiments, the carrier is a force sensor and / or a bearing spacer.

[0014] In some embodiments, the second thrust bearing is a rolling bearing.

[0015] The utility model also provides an electronic mechanical brake, the electronic mechanical brake has the brake caliper of any above-mentioned.

[0016] Due to the use of the above technical scheme, compared with the prior art, the utility model has the following advantages: in the brake caliper of the utility model, the installation gap in the brake can be stably and reliably eliminated by the pre-tightening mechanism, thereby improving the consistency of the state of multiple parts after assembly and improving the performance stability of the electronic mechanical brake. BRIEF DESCRIPTION OF DRAWINGS

[0017] ATTACHMENT Figure 1 It is an exploded schematic view of the electronic mechanical brake of the embodiment;

[0018] ATTACHMENT Figure 2 It is a cross-sectional schematic view of the electronic mechanical brake of the embodiment;

[0019] ATTACHMENT Figure 3 It is a cross-sectional schematic view of the electronic mechanical brake of the embodiment after removing the MGU assembly.

[0020] Wherein: 1, caliper body; 11, ring groove; 2, piston; 3, drive shaft; 31, first connecting part; 32, second connecting part; 33, positioning part; 41, nut; 42, elastic piece; 43, first thrust bearing; 44, second thrust bearing; 45, bearing; 5, support assembly; 6, MGU assembly; 7, brake pad. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, understandable and easy to understand, the present application will be described in detail below with reference to the drawings and specific embodiments. In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0022] In the description of the present application, 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", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0024] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0026] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0027] As shown in Figure 1 and Figure 2 The electronic mechanical brake of the present application comprises a bracket assembly 5, a brake caliper provided on the bracket assembly 5, and an MGU assembly 6 provided on the brake caliper.

[0028] As shown in Figure 2 and Figure 3 The brake caliper comprises a caliper body 1, a piston 2 and a drive shaft 3.

[0029] The caliper body 1 has a cavity, the piston 2 is slidably arranged in the cavity of the caliper body 1, and the drive shaft 3 is used to drive the piston 2 to slide in the cavity of the caliper body 1. The drive shaft 3 is rotatably arranged in the cavity of the caliper body 1.

[0030] The MGU assembly 6 is connected with the drive shaft 3, and the drive shaft 3 is driven to rotate by the MGU assembly 6, and the piston 2 is driven to slide in the cavity of the caliper body 1 when the drive shaft 3 rotates. In this embodiment, the drive shaft 3 and the piston 2 are connected through a ball screw pair. When the piston 2 slides out of the cavity of the caliper body 1, the brake pad 7 arranged on the bracket assembly 5 is driven to act, thereby realizing braking.

[0031] The brake caliper further comprises a pre-tightening mechanism, which can eliminate the axial installation gap of the drive shaft 3, so that during vehicle driving, collision and vibration noise caused by the gap between parts can be avoided, and the consistency of the state of multiple parts after assembly can be improved, and the performance stability of the electronic mechanical brake can be improved.

[0032] One end of the drive shaft 3 extends out of the cavity of the caliper body 1, as shown inFigure 2 and Figure 3 As shown in the figure, the pre-tightening mechanism comprises a nut 41 and an elastic member 42. The nut 41 is threadedly connected to the portion of the drive shaft 3 extending out of the cavity of the caliper body 1, and the axial position of the nut 41 on the drive shaft 3 can be adjusted according to the axial installation gap of the drive shaft 3. The elastic member 42 is arranged outside the cavity of the caliper body 1 and abuts between the nut 41 and the caliper body 1.

[0033] Specifically, the portion of the drive shaft 3 extending out of the cavity of the caliper body 1 comprises a first connecting portion 31 and a second connecting portion 32, the first connecting portion 31 is used for connecting with the MGU assembly 6, and the second connecting portion 32 is used for connecting with the nut 41. The first connecting portion 31 and the second connecting portion 32 are sequentially arranged from outside to inside, where the outside refers to outside the cavity of the caliper body 1, and the inside refers to inside the cavity of the caliper body 1. An outer thread for connecting with the nut 41 is arranged on the outer circumferential surface of the second connecting portion 32, and the diameter of the second connecting portion 32 is greater than that of the first connecting portion 31. In this way, when the nut 41 is threadedly connected with the second connecting portion 32, the thread specification can be selected to be larger, so that the self-locking ability is more stable and the reliability is higher.

[0034] The pre-tightening mechanism further comprises a first thrust bearing 43 arranged on the caliper body 1, the first thrust bearing 43 is located outside the cavity of the caliper body 1, and the elastic member 42 abuts between the nut 41 and the first thrust bearing 43. By arranging the first thrust bearing 43, the friction between the elastic member 42 and the caliper body 1 during operation of the brake can be reduced, the friction loss between the elastic member 42 and the caliper body 1 is reduced, and thus the service life is improved.

[0035] In this embodiment, the caliper body 1 is provided with an annular groove 11 extending in the circumferential direction of the drive shaft 3, and the first thrust bearing 43 is arranged in the annular groove 11.

[0036] In this embodiment, the first thrust bearing 43 is a rolling bearing.

[0037] The elastic member 42 can be selected from a disc spring, a wave spring, or a coil spring, etc.

[0038] The drive shaft 3 is provided with a positioning portion 33 located inside the cavity of the caliper body 1. The pre-tightening mechanism further comprises a second thrust bearing 44 sleeved on the drive shaft 3 and cooperating with the drive shaft 3, the second thrust bearing 44 is located inside the cavity of the caliper body 1 and arranged between the positioning portion 22 and the top of the cavity of the caliper body 1 in the axial direction.

[0039] During operation of the brake, the drive shaft 3 rotates relative to the caliper body 1, and the second thrust bearing 44 bears low-speed rotation and axial force. By arranging the second thrust bearing 44, the friction loss between the drive shaft 3 and the caliper body 1 can be reduced.

[0040] In this embodiment, the second thrust bearing 44 is also a rolling bearing.

[0041] In this embodiment, the pre-tightening mechanism further comprises a carrier 45 arranged at the top of the cavity of the caliper body 1, the carrier 45 is sleeved on the drive shaft 3, and the carrier 45 is fixed relative to the caliper body 1. During the operation of the brake, the carrier 45 mainly bears the axial load. The carrier 45 can be arranged separately relative to the caliper body 1, or be fixedly connected in the caliper body 1. The carrier 45 can also be arranged integrally with the caliper body 1.

[0042] The second thrust bearing 44 is arranged between the positioning portion 22 and the carrier 45.

[0043] The carrier 45 can be a force sensor, or can be a bearing pad.

[0044] In this embodiment, the drive shaft 3, the nut 41, the elastic member 42, the first thrust bearing 43, the second thrust bearing 44 and the carrier 45 are coaxially arranged.

[0045] When the brake caliper is installed, by moving the nut 41 relative to the drive shaft 3 towards the brake pad 7, the elastic member 42 is extruded, thereby reacting on the nut 41, and the elastic member 42 provides a pre-tightening tension to the drive shaft 3 in the direction of the MGU assembly 6, which can prevent the connection between the drive shaft 3 and the MGU assembly 6 from being disconnected. Moreover, the positioning portion 33 on the drive shaft 3 can also be pressed on the second thrust bearing 44, so that the axial gap between the caliper body 1, the carrier 45, the second thrust bearing 44 and the positioning portion 33 of the drive shaft 3 can be eliminated after the brake caliper is installed, and the pre-tightening force can be provided for the second thrust bearing 44.

[0046] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A brake caliper, comprising a caliper body having a cavity, a piston slidably disposed within the cavity of the caliper body, and a drive shaft for driving the piston to slide within the cavity of the caliper body, the drive shaft being rotatably disposed within the cavity of the caliper body, characterized in that: The brake caliper further includes a preload mechanism for eliminating axial installation clearance of the drive shaft. One end of the drive shaft extends out of the cavity of the caliper body. The preload mechanism includes a nut and an elastic element. The nut is threadedly connected to the portion of the drive shaft extending out of the cavity of the caliper body, and the axial position of the nut on the drive shaft can be adjusted according to the axial installation clearance of the drive shaft. The elastic element is disposed outside the cavity of the caliper body and abuts against the nut and the caliper body.

2. The brake caliper according to claim 1, characterized in that: The portion of the drive shaft extending out of the caliper body cavity includes a first connecting part connected to the MGU assembly and a second connecting part connected to the nut. The first connecting part and the second connecting part are arranged sequentially from the outside to the inside. The outer circumferential surface of the second connecting part is provided with an external thread for connecting to the nut. The diameter of the second connecting part is larger than the diameter of the first connecting part.

3. The brake caliper according to claim 1, characterized in that: The pre-tightening mechanism further includes a first thrust bearing disposed on the caliper body. The first thrust bearing is coaxially disposed with the drive shaft and is located outside the cavity of the caliper body. The elastic element abuts against the nut and the first thrust bearing.

4. The brake caliper according to claim 3, characterized in that: The first thrust bearing is a rolling bearing.

5. The brake caliper according to claim 1, characterized in that: The elastic element is a disc spring, wave spring, or helical spring.

6. The brake caliper according to claim 1, characterized in that: The drive shaft is provided with a positioning part, which is located in the cavity of the caliper body. The pre-tightening mechanism also includes a second thrust bearing provided on the drive shaft. The second thrust bearing is located in the cavity of the caliper body and is arranged in the axial direction between the positioning part and the top of the cavity of the caliper body.

7. The brake caliper according to claim 6, characterized in that: The pre-tightening mechanism also includes a support member disposed at the top of the cavity of the caliper body, the support member being sleeved on the drive shaft, and the second thrust bearing being disposed between the positioning part and the support member.

8. The brake caliper according to claim 7, characterized in that: The supporting component is a force sensor and / or a bearing gasket.

9. The brake caliper according to claim 6, characterized in that: The second thrust bearing is a rolling bearing.

10. An electromechanical brake, characterized in that: It has a brake caliper as described in any one of claims 1 to 9.

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