Lead screw mechanism, lead screw anti-rotation device and EMB

Abstract

The utility model relates to the technical field of anti-rotation structures, and particularly discloses a lead screw mechanism, a lead screw anti-rotation device and an EMB. The mechanism comprises a nut and a lead screw, a containing hole penetrates through the nut, one end of the nut is fixedly connected with an end cover, and the end cover is used for blocking an opening of the containing hole; the lead screw extends into the containing hole through the other opening part of the containing hole and is in threaded fit with the nut. The mechanism provides a stable environment for screw-thread fit of the lead screw and the nut, prevents external impurities from entering and influencing screw-thread fit, ensures normal operation of the lead screw mechanism, and reduces the manufacturing cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to anti -rotation structure technical field especially relates to screw mechanism, screw anti -rotation device and EMB. BACKGROUND

[0002] In prior art, EMB (Electro-Mechanical Brake) system usually adopts mechanical locking mechanism, and the locking purpose is achieved by controlling the screw mechanism. The screw mechanism is used for converting the circular motion of the motor into linear motion, and the screw nut in the screw mechanism needs to be designed for anti -rotation. However, the traditional screw mechanism is usually composed of a screw and a nut directly threaded, and its structure design has the technical pain points of insufficient sealing protection, end closure defects and weak movement limiting.

[0003] In view of the above problems, a screw mechanism with simplified structure, excellent sealing and integrated protection function is needed to improve the transmission stability and equipment life. UTILITY MODEL CONTENTS

[0004] The utility model discloses a screw mechanism, screw anti -rotation device and EMB provide stable environment for the thread cooperation of screw and nut, prevent external impurities from entering and affecting thread cooperation, ensure the normal operation of screw mechanism, and reduce the cost of manufacture.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The screw mechanism comprises a nut and a screw, the nut has a containing hole, one end of the nut is fixedly connected with an end cover, the end cover is used for plugging one opening of the containing hole, the screw is partially inserted into the containing hole through another opening of the containing hole, and the screw is threaded with the nut.

[0007] As an optional technical scheme of the screw mechanism, the screw comprises a matching section and a transmission section coaxially connected, the transmission section is located at one end of the matching section away from the end cover, the diameter of the transmission section is less than that of the matching section, the matching section is threaded with the nut, and the screw mechanism further comprises an annular gasket, the annular gasket is sleeved on the transmission section and adheres to the end face of the matching section.

[0008] As an optional technical scheme of the screw mechanism, the outer surface of the annular gasket is provided with a wear-resistant layer.

[0009] As an optional technical scheme of the screw mechanism, the end cover is press-fitted or laser welded on the nut.

[0010] The screw rod anti-rotation device comprises a clamp body, an anti-rotation member and the screw rod mechanism, at least one anti-rotation boss is arranged on the outer side wall of the nut, the clamp body is provided with a guide groove, the extension direction of the guide groove is parallel to the axis of the screw rod, the nut is arranged in the guide groove, the side wall of the guide groove is provided with an anti-rotation groove, the number of the anti-rotation groove is the same as that of the anti-rotation boss and the anti-rotation groove corresponds to the anti-rotation boss one by one, the number of the anti-rotation member is the same as that of the anti-rotation groove, the anti-rotation member can be detachably inserted into the anti-rotation groove along the depth direction of the anti-rotation groove, the anti-rotation member is provided with a sliding groove, the extension direction of the sliding groove is parallel to the axis of the screw rod, and each anti-rotation boss is in sliding fit with the sliding groove.

[0011] As an optional technical scheme of the screw rod anti-rotation device, the anti-rotation groove is communicated with a sealing groove, one end of the anti-rotation member is provided with an ear plate, and the ear plate can be matched and inserted into the sealing groove.

[0012] As an optional technical scheme of the screw rod anti-rotation device, the anti-rotation member comprises a bottom plate and two side plates, the two side plates are respectively bent on the two sides of the bottom plate, and the ear plate is fixedly connected to the end of the side plate.

[0013] As an optional technical scheme of the screw rod anti-rotation device, at least one end of the bottom plate is bent with a stop plate, and the stop plate is used for blocking the anti-rotation boss from being taken out of the sliding groove.

[0014] As an optional technical scheme of the screw rod anti-rotation device, the anti-rotation member is made by sheet metal processing or casting processing, and the groove wall of the sliding groove is provided with a wear-resistant layer.

[0015] The EMB comprises a power transmission mechanism and the screw rod anti-rotation device, and the power transmission mechanism is used for driving the screw rod to rotate around the axis of the screw rod.

[0016] The screw rod mechanism realizes the basic function of converting rotary motion into linear motion or converting linear motion into rotary motion through the thread cooperation between the screw rod and the nut, can be used in various devices requiring linear driving, and meets different mechanical transmission requirements.

[0017] The accommodating hole provided on the nut provides installation space for the screw rod, the end cover blocks one opening of the accommodating hole, the structure ensures the relative sealing of the screw rod mechanism, prevents dust, impurities and the like from entering the accommodating hole, thereby protecting the thread cooperation part of the screw rod and the nut, preventing external impurities from entering to affect the thread cooperation, ensuring the normal operation and structural integrity of the screw rod mechanism and prolonging the service life of the screw rod mechanism.

[0018] The anti-rotation device of the lead screw effectively prevents the nut in the lead screw mechanism from rotating, thereby ensuring that the rotational movement of the lead screw is converted into the linear movement of the nut. The anti-rotation boss provided on the outer side wall of the nut is matched with the sliding groove formed by the anti-rotation piece, the guide groove is parallel to the axis of the lead screw, and the anti-rotation boss is in sliding fit with the sliding groove, so that the nut can smoothly slide in the guide groove, and the nut can only move along the axis of the lead screw, thereby effectively preventing the nut from rotating with the lead screw, ensuring the stability of the movement of the nut on the lead screw, reducing unnecessary shaking and vibration, and improving the stability of the operation of the entire anti-rotation device of the lead screw. The anti-rotation piece can be detachably inserted into the anti-rotation groove, which facilitates the disassembly and maintenance of the anti-rotation piece on the body of the forceps, and is conducive to the maintenance and replacement of the lead screw mechanism and the anti-rotation piece. The above improvement realizes the anti-rotation design of the lead screw mechanism, ensures the compactness and reliability of the overall structure, improves the stability and accuracy of the operation, and also helps to reduce the processing cost and prolong the service life.

[0019] The EMB adopts the above-mentioned anti-rotation device of the lead screw and the power transmission mechanism, the power transmission mechanism drives the rotation of the lead screw, and the anti-rotation device of the lead screw converts the rotational movement into the linear movement of the nut, thereby realizing the stable and accurate transmission of power, improving the transmission accuracy and control performance of the EMB. The advantages of the anti-rotation device of the lead screw also make the EMB have better sealing performance, safety and durability. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the lead screw mechanism provided by the embodiment of the utility model;

[0021] Figure 2 is a front view of the anti-rotation device of the lead screw provided by the embodiment of the utility model;

[0022] Figure 3 is a sectional view of the anti-rotation device of the lead screw provided by the embodiment of the utility model;

[0023] Figure 4 is a structural schematic view of the lead screw mechanism and the anti-rotation piece provided by the embodiment of the utility model;

[0024] Figure 5 is a structural schematic view of the body of the forceps and the anti-rotation piece provided by the embodiment of the utility model;

[0025] Figure 6 is a sectional view of the body of the forceps and the anti-rotation piece provided by the embodiment of the utility model;

[0026] Figure 7 is a structural schematic view of the anti-rotation piece provided by the embodiment of the utility model;

[0027] Figure 8 is a structural schematic view of the EMB provided by the embodiment of the utility model;

[0028] Figure 9 is a cross-sectional view of the EMB provided by the embodiment of the present application.

[0029] In the drawing:

[0030] 11, caliper body assembly; 12, brake disc; 13, friction plate; 20, power transmission mechanism; 30, force sensor; 40, rolling bearing; 50, bearing pad;

[0031] 51, caliper body; 511, sealing groove; 512, anti-rotation groove;

[0032] 300, screw mechanism; 301, nut; 3011, anti-rotation boss; 302, end cover; 303, screw; 3031, matching section; 3032, transmission section; 304, annular pad;

[0033] 410, anti-rotation member; 411, sliding groove; 412, stop plate; 413, ear plate; 414, bottom plate; 415, side plate. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate 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 do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature on the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature on the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "connection", "connection" should be broad sense understanding, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0038] As Figure 1 The utility model provides screw mechanism 300, including nut 301 and screw rod 303, nut 301 is through having accommodation hole, one end of nut 301 is fixedly connected with end cover 302, and end cover 302 is used to block one opening of accommodation hole, screw rod 303 is partially inserted into accommodation hole through another opening of accommodation hole and is threadedly matched with nut 301.

[0039] The screw mechanism 300 is threadedly matched with the nut 301 through the screw rod 303, realizes the basic function of converting rotary motion into linear motion or converting linear motion into rotary motion, and can be used in various devices requiring linear driving to meet different mechanical transmission requirements. The accommodation hole formed in the nut 301 provides a mounting space for the screw rod 303, and the end cover 302 blocks one opening of the accommodation hole. This structure ensures the relative sealing of the screw mechanism 300, prevents dust, impurities, etc. from entering the accommodation hole, thereby protecting the threaded portion of the screw rod 303 and the nut 301, preventing external impurities from entering and affecting the threaded connection, ensuring the normal operation and structural integrity of the screw mechanism 300, and prolonging its service life. At the same time, the separate arrangement of the end cover 302 and the nut 301 reduces the manufacturing difficulty and reduces the production cost.

[0040] In the embodiment, the screw rod 303 includes a matching section 3031 and a transmission section 3032 coaxially connected, the transmission section 3032 is located at one end of the matching section 3031 away from the end cover 302, the diameter of the transmission section 3032 is smaller than the diameter of the matching section 3031, the matching section 3031 is threadedly matched with the nut 301, and the screw mechanism 300 further includes an annular gasket 304, the annular gasket 304 is sleeved on the transmission section 3032 and abuts against the end face of the matching section 3031.

[0041] The screw rod 303 is divided into a fitting section 3031 and a transmission section 3032, and the diameter of the transmission section 3032 is smaller than the diameter of the fitting section 3031. This design makes the fitting section 3031 focus on thread fitting with the nut 301, and the transmission section 3032 can be better connected with other transmission components, facilitating power transmission to the screw rod mechanism 300, and improving the adaptability of the screw rod 303 to different components.

[0042] The annular gasket 304 is sleeved on the transmission section 3032 and abuts against the end face of the fitting section 3031. When the screw rod 303 is in transmission with other components, the relative rotation of the screw rod 303 and the annular gasket 304 can realize sliding fit, thereby playing a buffering and protection role, reducing direct friction and impact between the fitting section 3031 and other components, prolonging the service life of the screw rod 303, and protecting the screw rod mechanism 300 and other connected components.

[0043] Further, the outer surface of the annular gasket 304 is provided with a wear-resistant layer.

[0044] The outer surface of the annular gasket 304 is provided with a wear-resistant layer, which can effectively improve the wear resistance of the annular gasket 304, reduce wear caused by friction during long-term use, prolong the service life of the annular gasket 304, reduce the replacement frequency of the annular gasket 304, and thereby ensure the stability and reliability of the screw rod mechanism 300.

[0045] In one embodiment of the present embodiment, the end cover 302 is press-fitted on the nut 301. The press-fitting method is simple to operate and can meet the requirements of connection strength.

[0046] In another embodiment of the present embodiment, the end cover 302 is laser welded on the nut 301. Laser welding also has the advantages of high connection strength and good sealing performance.

[0047] The end cover 302 is press-fitted or laser welded on the nut 301. Both connection methods can form a firm connection between the end cover 302 and the nut 301, prevent the end cover 302 from loosening or falling off, and thereby ensure that the end cover 302 can effectively block the accommodation hole and prevent foreign matter from entering, ensuring the structural stability and sealing performance of the screw rod mechanism 300.

[0048] As shown in FIG. 4, the end cover 302 is press-fitted on the nut 301. Figures 1 to 7As shown, the embodiment also provides a screw rotation prevention device, which comprises a clamp body 51, a rotation prevention member 410 and the screw mechanism 300 described above, the outer side wall of the nut 301 is provided with at least one rotation prevention boss 3011; the clamp body 51 is provided with a guide groove, the extension direction of the guide groove is parallel to the axis of the screw rod 303, the nut 301 is arranged in the guide groove, the side wall of the guide groove is provided with a rotation prevention groove 512, the number of the rotation prevention groove 512 is the same as that of the rotation prevention boss 3011 and they are one-to-one corresponding; the number of the rotation prevention member 410 is the same as that of the rotation prevention groove 512, the rotation prevention member 410 can be detachably inserted into the rotation prevention groove 512 along the depth direction of the rotation prevention groove 512, the rotation prevention member 410 has a sliding groove 411, the extension direction of the sliding groove 411 is parallel to the axis of the screw rod 303, and each rotation prevention boss 3011 is in sliding cooperation with one sliding groove 411.

[0049] The screw rotation prevention device prevents the rotation of the nut 301 in the screw mechanism 300 through the cooperation of the rotation prevention boss 3011, the rotation prevention groove 512 and the rotation prevention member 410, thereby ensuring that the rotational movement of the screw rod 303 is converted into the linear movement of the nut 301. The rotation prevention boss 3011 arranged on the outer side wall of the nut 301 cooperates with the sliding groove 411 formed by the rotation prevention member 410, the guide groove is parallel to the axis of the screw rod 303, the rotation prevention boss 3011 is in sliding cooperation with the sliding groove 411, the nut 301 can smoothly slide in the guide groove, the nut 301 can only move along the axis direction of the screw rod 303, thereby effectively preventing the nut 301 from rotating with the screw rod 303, which ensures the stability of the movement of the nut 301 on the screw rod 303, reduces unnecessary shaking and vibration, and improves the stability of the operation of the entire screw rotation prevention device. The design that the rotation prevention member 410 can be detachably inserted into the rotation prevention groove 512 facilitates the disassembly, assembly and maintenance of the rotation prevention member 410 on the clamp body 51, and is conducive to the maintenance and replacement of the screw mechanism 300 and the rotation prevention member 410. The above improvement realizes the rotation prevention design of the screw mechanism 300, guarantees the compactness and reliability of the overall structure, improves the stability and accuracy of the operation, and also helps to reduce the processing cost and prolong the service life.

[0050] In the embodiment, the rotation prevention groove 512 is communicated with a sealing groove 511, one end of the rotation prevention member 410 is provided with an ear plate 413, and the ear plate 413 can be matched and inserted into the sealing groove 511.

[0051] By matching and inserting the ear plate 413 into the sealing groove 511, the stable installation of the rotation prevention member 410 in the rotation prevention groove 512 is guaranteed, and the stability of the entire device is improved. The sealing groove 511 plays a limiting and positioning role on the rotation prevention member 410, ensures the accurate installation of the rotation prevention member 410, reduces the risk of position deviation of the rotation prevention member 410 due to accidents, and prolongs the service life.

[0052] Further, the anti-rotation member 410 comprises a bottom plate 414 and two side plates 415, which are respectively bent on two sides of the bottom plate 414, and the lug plate 413 is fixedly connected to the end of the side plate 415.

[0053] The anti-rotation member 410 is formed by bending the bottom plate 414 and the two side plates 415, which increases the strength and rigidity of the anti-rotation member 410, so that the anti-rotation member 410 has good stability and can better withstand the force generated by the anti-rotation boss 3011 during sliding, which helps to reduce the risk of deformation of the anti-rotation member 410; the lug plate 413 is fixedly connected to the end of the side plate 415, which facilitates cooperation with the sealing groove 511 and ensures the reliability of the connection, and such a structure is simple and easy to manufacture through conventional processing technology, thereby reducing the production difficulty and manufacturing cost.

[0054] Further, at least one end of the bottom plate 414 is bent to form a stop plate 412, which is used to block the anti-rotation boss 3011 from being pulled out of the sliding groove 411.

[0055] The stop plate 412 bent at the end of the bottom plate 414 can effectively prevent the anti-rotation boss 3011 from being pulled out of the sliding groove 411, thereby ensuring the safety and stability of the lead screw anti-rotation device during the operation of the lead screw mechanism 300, avoiding device failure or failure caused by the anti-rotation boss 3011 being pulled out, ensuring reliable operation of the device, and ensuring the continuous effectiveness of the anti-rotation function of the lead screw 303.

[0056] In one embodiment of the present embodiment, the anti-rotation member 410 is manufactured by sheet metal processing.

[0057] The scheme of designing the anti-rotation member 410 as a sheet metal part has the advantages of simple forming and easy installation, and the sheet metal processing has low cost and high production efficiency, which is suitable for batch production.

[0058] Specifically, the anti-rotation member 410 is stamped and formed.

[0059] In another embodiment of the present embodiment, the anti-rotation member 410 is manufactured by casting processing.

[0060] Casting processing can manufacture anti-rotation members 410 with complex shapes, and cast parts have good mechanical properties.

[0061] Both of the above two processing methods have high production efficiency and are suitable for large-scale production. According to different design requirements and production conditions, appropriate processing methods can be selected to manufacture anti-rotation members 410 that meet the accuracy and performance requirements, thereby improving the flexibility of production.

[0062] In one embodiment of the present embodiment, the material of the plier body 51 is aluminum alloy.

[0063] The aluminum alloy has the characteristics of light weight and corrosion resistance, which helps to reduce the overall weight of the anti-rotation device of the screw rod, is suitable for occasions with weight requirements, and the good corrosion resistance can prolong the service life of the clamp body 51.

[0064] However, the aluminum alloy will be worn out by the long-term pressure of the anti-rotation boss 3011. In the prior art, it is generally considered to increase the number of anti-rotation members 410 to improve the anti-wear ability of the clamp body 51. The corresponding improvement scheme is common knowledge in the art and is well known to those skilled in the art, and is not the focus of the present embodiment, so it will not be described here.

[0065] In another embodiment of the present embodiment, the material of the clamp body 51 is cast iron.

[0066] The cast iron material of the clamp body 51 has high strength and wear resistance, can withstand large forces and friction, is suitable for harsh environments, and can ensure that the anti-rotation member 410 will not be easily damaged during long-term use.

[0067] In the present embodiment, the groove wall of the sliding groove 411 is provided with a wear-resistant layer.

[0068] The wear-resistant layer on the groove wall of the sliding groove 411 can reduce the wear of the sliding groove 411 by the anti-rotation boss 3011 during sliding, prolong the service life of the anti-rotation member 410, improve the wear resistance, reduce the maintenance frequency, and ensure the long-term stable operation of the anti-rotation device of the screw rod.

[0069] Exemplarily, the sealing groove 511 is an annular groove on the side wall of the guide groove.

[0070] The design of the sealing groove 511 as an annular groove on the side wall of the guide groove reduces the processing difficulty of the sealing groove 511, reduces the production cost of the clamp body 51, and helps to ensure the smooth insertion of the ear plate 413 in the sealing groove 511. At the same time, the limitation of the annular groove also facilitates the setting of a sealing ring therein, so that a ring-shaped sealing structure can be formed around the guide groove.

[0071] Further, the anti-rotation device of the screw rod further comprises a sealing ring, which is installed in the sealing groove 511.

[0072] The design of installing a sealing ring in the sealing groove 511 enhances the sealing effect of the anti-rotation device of the screw rod, effectively prevents foreign matter from entering the anti-rotation groove 512 and the guide groove, avoids affecting the sliding cooperation between the anti-rotation boss 3011 and the sliding groove 411, protects the internal parts from corrosion and damage, helps to prevent the leakage of internal lubricating grease, prolongs the service life of the device; at the same time, it also has the functions of buffering and damping, reducing the noise and vibration generated during the operation of the device.

[0073] The design that the ear plate 413 and the sealing ring are simultaneously installed in the sealing groove 511 realizes effective utilization of the internal space of the plier body 51, reduces the occupied space, and further reduces the risk of position deviation of the anti-rotation part 410.

[0074] In the embodiment, the guide groove is cylindrical, and the depth direction of the anti-rotation groove 512 is the radial direction of the guide groove.

[0075] The guide groove is cylindrical, and the depth direction of the anti-rotation groove 512 is the radial direction of the guide groove. The design makes the dismounting direction of the anti-rotation part 410 on the plier body 51 perpendicular to the moving direction of the screw rod mechanism 300 relative to the plier body 51, and further reduces the risk of position deviation of the anti-rotation part 410. The cylindrical guide groove is matched with the shape of the screw rod mechanism 300, can make the nut 301 move smoothly in the guide groove, the radially arranged anti-rotation groove 512 facilitates the installation of the anti-rotation part 410, and makes the cooperation between the components more compact and reasonable, and can better realize the anti-rotation and transmission functions. The above structure layout makes the screw rod anti-rotation device convenient to process and manufacture, reduces the processing difficulty and production cost.

[0076] In the embodiment, the anti-rotation boss 3011 is provided with two, and the two anti-rotation bosses 3011 are symmetrical about the axis of the screw rod 303.

[0077] Exemplarily, the anti-rotation boss 3011 is integrally formed on the nut 301 or the anti-rotation boss 3011 is inserted on the outer side wall of the nut 301.

[0078] In the embodiment, the annular gasket 304 is clamped between the plier body 51 and the matching section 3031, and the matching section 3031 and the annular gasket 304 are in sliding cooperation. Thus, direct contact between the plier body 51 and the matching section 3031 is avoided, the risk of wear between the plier body 51 and the matching section 3031 is reduced, and the long-term stable operation of the screw rod anti-rotation device is helped to be ensured.

[0079] As shown in the figure, Figures 1 to 9 The embodiment also provides an EMB including the power transmission mechanism 20 and the above-mentioned screw rod anti-rotation device. The power transmission mechanism 20 is used to drive the screw rod 303 to rotate about the axis of the screw rod 303.

[0080] The EMB adopts the above-mentioned screw rod anti-rotation device and the power transmission mechanism 20. The power transmission mechanism 20 drives the screw rod 303 to rotate, and the screw rod anti-rotation device converts the rotary motion into the linear motion of the nut 301, so that stable and accurate transmission of power is realized, and the transmission accuracy and control performance of the EMB are improved. The advantages of the screw rod anti-rotation device also make the EMB have better sealing performance, safety and durability and the like.

[0081] Specifically, the power transmission mechanism 20 comprises a controller, a motor, a transmission gear and the like. The specific structure of the power transmission mechanism 20 is known in the art and is not the focus of the present embodiment, and thus is not described in detail here.

[0082] The EMB further comprises a caliper body assembly 11, a brake disc 12, a friction plate 13, a force sensor 30, a bearing pad 50 and a rolling bearing 40, the caliper body 51 is fixedly arranged on the caliper body assembly 11, the brake disc 12 is rotatably connected to the caliper body assembly 11, the friction plate 13 is movably arranged between the nut 301 and the brake disc 12, and after the power transmission mechanism 20 drives the lead screw mechanism 300, the nut 301 can push the friction plate 13 to abut against the side surface of the brake disc 12, so as to achieve the purpose of locking the brake disc 12. The bearing pad 50 is rotatably connected to the lead screw 303, the rolling bearing 40 is rotatably connected to the lead screw 303, and the force sensor 30 is used for detecting the stress of each part in the EMB.

[0083] It is worth noting that the connection structure of the brake disc 12, the friction plate 13, the force sensor 30, the bearing pad 50 and the rolling bearing 40 on the EMB and the structure of the caliper body assembly 11 can be set according to the prior art, and the specific structure and working principle are known in the art, which is not the focus of the present embodiment, and thus is not limited and described in detail.

[0084] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or modifications can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A lead screw mechanism, characterized in that, include: A nut (301) has a through-hole, and an end cap (302) is fixed to one end of the nut (301). The end cap (302) is used to block one opening of the through-hole. The lead screw (303) extends into the receiving hole through another opening portion of the receiving hole and is threadedly engaged with the nut (301).

2. The lead screw mechanism according to claim 1, characterized in that, The lead screw (303) includes a mating section (3031) and a transmission section (3032) coaxially connected. The transmission section (3032) is located at the end of the mating section (3031) away from the end cap (302). The diameter of the transmission section (3032) is smaller than the diameter of the mating section (3031). The mating section (3031) is threadedly engaged with the nut (301). The lead screw mechanism also includes an annular washer (304). The annular washer (304) is sleeved on the transmission section (3032) and fits against the end face of the mating section (3031).

3. The lead screw mechanism according to claim 2, characterized in that, The outer surface of the annular gasket (304) is provided with a wear-resistant layer.

4. The lead screw mechanism according to any one of claims 1-3, characterized in that, The end cap (302) is press-fitted or laser-welded to the nut (301).

5. A lead screw anti-rotation device, characterized in that, The device includes a clamp body (51), an anti-rotation component (410), and a lead screw mechanism as described in any one of claims 1-4. The outer side wall of the nut (301) is provided with at least one anti-rotation boss (3011). The clamp body (51) is provided with a guide groove, the extension direction of which is parallel to the axis of the lead screw (303). The nut (301) is disposed within the guide groove. The side wall of the guide groove is provided with an anti-rotation groove (512), which is connected to the anti-rotation boss (3011). The number of each anti-rotation component (410) is the same and they correspond one-to-one; the number of each anti-rotation component (410) is the same as the number of each anti-rotation groove (512). Each anti-rotation component (410) can be detachably inserted into the anti-rotation groove (512) along the depth direction of the anti-rotation groove (512). Each anti-rotation component (410) has a sliding groove (411). The extension direction of the sliding groove (411) is parallel to the axis of the lead screw (303). Each anti-rotation boss (3011) is slidably engaged with one of the sliding grooves (411).

6. The lead screw anti-rotation device according to claim 5, characterized in that, The anti-rotation groove (512) is connected to the sealing groove (511), and one end of the anti-rotation component (410) is provided with an ear plate (413), which can be fitted into the sealing groove (511).

7. The lead screw anti-rotation device according to claim 6, characterized in that, The anti-rotation component (410) includes a bottom plate (414) and two side plates (415), the two side plates (415) being bent on both sides of the bottom plate (414) respectively, and the ear plate (413) being fixed to the end of the side plate (415).

8. The lead screw anti-rotation device according to claim 7, characterized in that, At least one end of the bottom plate (414) is bent with a stop plate (412) for preventing the anti-rotation boss (3011) from dislodging from the sliding groove (411).

9. The lead screw anti-rotation device according to claim 7, characterized in that, The anti-rotation component (410) is made by sheet metal processing or casting, and the groove wall of the sliding groove (411) is provided with a wear-resistant layer.

10. EMB, characterized in that, It includes a power transmission mechanism (20) and a lead screw anti-rotation device according to any one of claims 5-9, wherein the power transmission mechanism (20) is used to drive the lead screw (303) to rotate about the axis of the lead screw (303).

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