A new EPB screw sleeve assembly

Abstract

The utility model relates to screw rod screw sleeve technical field especially a new type EPB screw rod screw sleeve subassembly, including screw sleeve, screw rod and connecting plate, the screw rod fixed connection is in one side of connecting plate, the screw sleeve threadedly sleeved is in the outside of screw rod, the end of screw sleeve is equipped with the travel departure positioning structure, the outer wall of screw sleeve is equipped with lubricating oil injection structure, the back of connecting plate is equipped with motor butt joint structure. The new type EPB screw rod screw sleeve subassembly, the aperture of the reserved hole and the outer diameter of the guide rod are precisely adapted, the length of the guide rod can be selected according to the travel distance of the screw sleeve, ensuring that the movement of the screw sleeve can be limited, the radial swing of the screw sleeve can be limited through the guide rod of the front end of the screw rod, the precise sliding fit of the travel departure positioning structure through the guide rod and the reserved hole limits the radial deviation of the screw sleeve throughout, ensuring that the screw rod and the screw sleeve always maintain coaxial, effectively avoiding the thread jamming problem under the working condition such as vehicle bumping, braking impact, guaranteeing braking effectiveness.

Description

Technical Field

[0001] This utility model relates to the field of screw and sleeve technology, specifically a novel EPB screw and sleeve assembly. Background Technology

[0002] The EPB screw and sleeve assembly is the core electromechanical conversion and force transmission component in the electronic parking brake (EPB) caliper. It consists of a meshing screw and sleeve and is responsible for converting the rotational motion of the motor into the linear thrust of the piston to achieve parking clamping and release. It is a key transmission component of the EPB mechanical actuator.

[0003] For example, the authorized announcement number "CN217056212U" describes a new type of EPB screw and sleeve assembly. A threaded rod is fixedly connected to the left side of the connecting rod, and a threaded sleeve is threadedly connected to the surface of the threaded rod. The inner cavity of the threaded sleeve is provided with internal threads, which achieves the function of operation. The existing new type of EPB screw and sleeve assembly is just a relatively common screw and sleeve assembly. The screw used in the EPB braking mechanism needs to have a stroke positioning function. However, the existing new type of EPB screw and sleeve assembly lacks a guiding or coaxiality protection structure. Under vehicle bumpy conditions, the screw and sleeve are prone to misalignment, which may cause jamming due to uneven thread stress.

[0004] Meanwhile, the existing new EPB screw and sleeve assembly faces many complex operating conditions during vehicle operation, such as vehicle bumps and vibrations, external dust accumulation, and changes in ambient temperature. This requires frequent addition of lubricating oil to the inside of the screw and sleeve assembly for lubrication and cooling. The existing new EPB screw and sleeve assembly lacks a structure for adding lubricating oil in all directions, which makes it difficult for the lubricating oil injected at the end to fully fill the sleeve, affecting the smoothness of screw transmission. Utility Model Content

[0005] This utility model addresses the problems of existing novel EPB screw and sleeve assemblies, which lack guiding or coaxiality protection structures. Under vehicle bumpy conditions, the screw and sleeve are prone to misalignment, which may lead to jamming due to uneven thread stress. Furthermore, the lack of a comprehensive lubrication structure makes it difficult for the lubricating oil injected at the end to fully fill the sleeve, affecting the smoothness of screw transmission. Therefore, a novel EPB screw and sleeve assembly is proposed.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A novel EPB screw and sleeve assembly is designed, comprising a sleeve, a screw, and a connecting plate. The screw is fixedly connected to one side of the connecting plate, and the sleeve is threaded onto the outside of the screw. The end of the sleeve is provided with a stroke start positioning structure, and the outer wall of the sleeve is provided with a lubrication and oil injection structure. The rear side of the connecting plate is provided with a motor docking structure.

[0007] In this configuration, the threads of the sleeve and the screw can mesh for transmission, and both the sleeve and the screw are made of stainless steel.

[0008] Preferably, the stroke start positioning structure includes a reserved hole and a reinforcing rib. The reserved hole is fixedly opened on one side of the outer wall of the threaded sleeve, and a guide rod is slidably connected inside the reserved hole. The two reinforcing ribs are fixedly installed on both sides of the inner wall of the threaded sleeve.

[0009] This design ensures precise matching between the diameter of the pre-drilled hole and the outer diameter of the guide rod, guaranteeing guiding accuracy. The end of the guide rod is fixedly connected to the front end of the screw rod by welding. The length of the guide rod can be selected according to the stroke distance of the screw sleeve, ensuring that the movement of the screw sleeve can be limited. The reinforcing rib made of high-carbon steel extends along the axial direction of the screw sleeve and is integrally formed with the inner wall of the screw sleeve. This not only enhances the structural strength of the screw sleeve, but also limits the radial swing of the screw sleeve through the guide rod at the front end of the screw rod.

[0010] Preferably, the end of the guide rod is fixedly connected to the front end of the screw, and the two reinforcing ribs are arranged in parallel relative to each other.

[0011] Preferably, the lubrication and oil injection structure includes an oil injection hole and a sealing gasket. The two oil injection holes are fixedly opened at both ends of the outer wall of the threaded sleeve. A connecting pipe is fixedly connected to the outer side of the two oil injection holes. The two sealing gaskets are sleeved on the root of the connecting pipe. A sealing post is installed on the inner thread of the connecting pipe. A rubber ball is fixedly installed at the lower end of the sealing post.

[0012] In this configuration, the oil injection holes are fixedly located at both ends of the outer wall of the threaded sleeve, symmetrically distributed. The axis of the oil injection holes and the radial direction of the threaded sleeve are arranged in a trumpet shape, which facilitates the flow of lubricating oil along the internal direction of the threaded sleeve and achieves full coverage. The inner wall of the connecting pipe has internal threads that match the external threads of the sealing column. The rubber ball is made of oil-resistant nitrile rubber, and its diameter is slightly larger than the diameter of the oil injection hole to form an interference fit and improve the sealing effect. Two sealing gaskets are fitted onto the root of the connecting pipe. The sealing gaskets are made of fluororubber, which is resistant to high temperature and oil, and are fixedly installed at the connection between the oil injection hole and the threaded sleeve to form a seal.

[0013] Preferably, the rubber ball is movably inserted into the inner wall of the oil injection hole, and the two sealing gaskets are fixedly installed at the connection between the oil injection hole and the threaded sleeve.

[0014] Preferably, the motor docking structure includes a transmission rod and a support plate. The transmission rod is fixedly installed on the outer wall of the connecting plate, and the other end of the transmission rod is fixedly connected to the support plate. The outer wall of the support plate is fixedly connected to a mounting flange, and the inner side of the mounting flange is threaded with multiple locking bolts.

[0015] Preferably, the mounting flange is fixedly connected to the motor output shaft by locking bolts, and the transmission rod and the screw are coaxially arranged.

[0016] The novel EPB screw and sleeve assembly proposed in this utility model has the following advantages: the diameter of the reserved hole is precisely matched with the outer diameter of the guide rod to ensure guiding accuracy; the length of the guide rod can be selected according to the stroke distance of the sleeve to ensure that the movement of the sleeve can be limited; the guide rod at the front end of the screw can limit the radial swing of the sleeve; the stroke start positioning structure limits the radial displacement of the sleeve throughout the stroke through the precise sliding fit between the guide rod and the reserved hole, ensuring that the screw and sleeve always remain coaxial, effectively avoiding the problem of thread jamming under conditions such as vehicle bumps and braking impacts, and ensuring braking effectiveness.

[0017] The oil injection holes are fixedly located at both ends of the outer wall of the screw sleeve, symmetrically distributed. The axis of the oil injection hole and the radial direction of the screw sleeve are arranged in a trumpet shape, which facilitates the flow of lubricating oil along the internal direction of the screw sleeve and achieves full coverage. The inner wall of the connecting pipe has internal threads that match the external threads of the sealing column. The rubber ball is made of oil-resistant nitrile rubber, and its diameter is slightly larger than the diameter of the oil injection hole to form an interference fit and improve the sealing effect. The symmetrical oil injection hole design at both ends, combined with the trumpet-shaped channel layout, allows the lubricating oil to penetrate evenly along the spiral direction of the thread to the entire meshing surface, completely solving the problem of uneven lubrication at a single point. The rubber ball and the sealing gasket form a seal, which can effectively prevent lubricating oil leakage and block the intrusion of external dust, ensuring the smooth transmission of the new EPB screw sleeve assembly. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention. Figure 2 for Figure 1 Front sectional view, Figure 3 for Figure 1 A side sectional view. Figure 4 for Figure 2 Enlarged diagram of part A in the middle. Figure 5 for Figure 2 Enlarged diagram of part B in the middle. Figure 6 for Figure 2 Enlarged diagram of part C in the middle.

[0019] In the diagram: 1. Screw sleeve, 2. Screw rod, 3. Connecting plate, 4. Stroke start positioning structure, 41. Reserved hole, 42. Guide rod, 43. Reinforcing rib, 5. Lubrication and oil injection structure, 51. Oil injection hole, 52. Connecting pipe, 53. Sealing column, 54. Rubber ball, 55. Sealing gasket, 6. Motor docking structure, 61. Transmission rod, 62. Support plate, 63. Mounting flange, 64. Locking bolt. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings: Example: Please refer to Figure 1-6 In this embodiment, a novel EPB screw and sleeve assembly includes a sleeve 1, a screw 2, and a connecting plate 3. The screw 2 is fixedly connected to one side of the connecting plate 3, and the sleeve 1 is threaded onto the outside of the screw 2. The threads of the sleeve 1 and the screw 2 can cooperate to perform transmission. Both the sleeve 1 and the screw 2 are made of stainless steel. The end of the sleeve 1 is provided with a stroke start positioning structure 4, the outer wall of the sleeve 1 is provided with a lubrication and oil injection structure 5, and the rear side of the connecting plate 3 is provided with a motor docking structure 6.

[0021] The stroke departure positioning structure 4 includes a reserved hole 41 and a reinforcing rib 43. The reserved hole 41 is fixedly opened on one side of the outer wall of the screw sleeve 1. A guide rod 42 is slidably connected inside the reserved hole 41. Two reinforcing ribs 43 are fixedly installed on both sides of the inner wall of the screw sleeve 1. The end of the guide rod 42 is fixedly connected to the front end of the screw 2. The two reinforcing ribs 43 are arranged relatively parallel. The diameter of the reserved hole 41 is precisely matched with the outer diameter of the guide rod 42 to ensure guiding accuracy. The end of the guide rod 42 is fixedly connected to the front end of the screw 2 by welding. The length of the guide rod 42 can be selected according to the stroke distance of the screw sleeve 1 to ensure that the movement of the screw sleeve 1 can be limited. The reinforcing rib 43 made of high carbon steel extends along the axial direction of the screw sleeve 1 and is integrally formed with the inner wall of the screw sleeve 1. It can not only enhance the structural strength of the screw sleeve 1, but also limit the radial swing of the screw sleeve 1 through the guide rod 42 at the front end of the screw 2.

[0022] The lubrication and oil filling structure 5 includes oil filling holes 51 and sealing gaskets 55. Two oil filling holes 51 are fixedly opened at both ends of the outer wall of the threaded sleeve 1. A connecting pipe 52 is fixedly connected to the outer side of the two oil filling holes 51. Two sealing gaskets 55 are sleeved on the root of the connecting pipe 52. A sealing post 53 is threaded onto the inner side of the connecting pipe 52. A rubber ball 54 is fixedly installed at the lower end of the sealing post 53. The rubber ball 54 is movably inserted into the inner wall of the oil filling hole 51. Two sealing gaskets 55 are fixedly disposed at the connection between the oil filling hole 51 and the threaded sleeve 1. The oil filling holes 51 are fixedly opened at both ends of the outer wall of the threaded sleeve 1, forming a... The lubricating oil holes 51 are symmetrically distributed, with the axis of the lubricating oil hole 51 and the radial direction of the threaded sleeve 1 arranged in a trumpet shape, which facilitates the flow of lubricating oil along the internal direction of the threaded sleeve 1 and achieves full coverage. The inner wall of the connecting pipe 52 is provided with internal threads, which are adapted to the external threads of the sealing column 53. The rubber ball 54 is made of oil-resistant nitrile rubber, and its diameter is slightly larger than the diameter of the lubricating oil hole 51 to form an interference fit and improve the sealing effect. Two sealing gaskets 55 are sleeved on the root of the connecting pipe 52. The sealing gaskets 55 are made of fluororubber, which is resistant to high temperature and oil, and are fixedly set at the connection between the lubricating oil hole 51 and the threaded sleeve 1 to form a seal.

[0023] The motor docking structure 6 includes a transmission rod 61 and a support plate 62. The transmission rod 61 is fixedly installed on the outer wall of the connecting plate 3. The other end of the transmission rod 61 is fixedly connected to the support plate 62. The outer wall of the support plate 62 is fixedly connected to a mounting flange 63. Multiple locking bolts 64 are threaded on the inner side of the mounting flange 63. The mounting flange 63 is fixedly connected to the motor output shaft through the locking bolts 64. The transmission rod 61 and the screw 2 are coaxially arranged.

[0024] The transmission rod 61 is fixedly installed on the outer wall of the connecting plate 3. The transmission rod 61 and the screw 2 are coaxial and integrated to ensure accurate torque transmission. The support plate 62 is a circular metal plate to enhance structural rigidity. The end face of the mounting flange 63 is perpendicular to the support plate 62, and its outer diameter is adapted to the mounting surface of the motor output shaft. Multiple locking bolts 64 are evenly distributed along the circumference on the inner side of the mounting flange 63 to ensure a stable connection. The mounting flange 63 is fixedly connected to the motor output shaft through the locking bolts 64 to achieve reliable torque transmission.

[0025] Working principle: The new EPB screw and sleeve assembly first involves assembling the screw and sleeve assembly. First, the guide rod 42 is fixedly connected to the front end of the screw 2, ensuring a firm and secure connection. Then, the sleeve 1 is threaded onto the outside of the screw 2, allowing the guide rod 42 to slide smoothly into the pre-drilled hole 41. Finally, the rear side of the connecting plate 3 is fixedly connected to the motor output shaft using the mounting flange 63 and locking bolts 64, ensuring that the transmission rod 61 is coaxial with the motor output shaft. The transmission rod 61 is fixedly installed on the outer wall of the connecting plate 3. The transmission rod 61 and the screw 2 are coaxial and integrated to ensure accurate torque transmission. The support plate 62 is a circular metal plate to enhance structural rigidity. The end face of the mounting flange 63 is perpendicular to the support plate 62, and its outer diameter is adapted to the mounting surface of the motor output shaft. Multiple locking bolts 64 are evenly distributed along the circumference on the inner side of the mounting flange 63 to ensure a stable connection. The mounting flange 63 is fixedly connected to the motor output shaft through the locking bolts 64 to achieve reliable torque transmission. The diameter of the reserved hole 41 is precisely matched with the outer diameter of the guide rod 42 to ensure guiding accuracy. The end of the guide rod 42 is fixedly connected to the front end of the screw 2 by welding. The length of the guide rod 42 can be selected according to the stroke distance of the screw sleeve 1 to ensure that the movement of the screw sleeve 1 can be limited. The reinforcing rib 43 made of high carbon steel extends along the axial direction of the screw sleeve 1 and is integrally formed with the inner wall of the screw sleeve 1. It can not only enhance the structural strength of the screw sleeve 1, but also limit the radial swing of the screw sleeve 1 through the guide rod 42 at the front end of the screw 2. Oil injection holes 51 are fixedly opened at both ends of the outer wall of the threaded sleeve 1, and are symmetrically distributed. The axis of the oil injection holes 51 and the radial direction of the threaded sleeve 1 are arranged in a trumpet shape, which facilitates the flow of lubricating oil along the internal direction of the threaded sleeve 1 to achieve full coverage. The inner wall of the connecting pipe 52 is provided with internal threads, which are adapted to the external threads of the sealing column 53. The rubber ball 54 is made of oil-resistant nitrile rubber, and its diameter is slightly larger than the diameter of the oil injection hole 51 to form an interference fit and improve the sealing effect. Two sealing gaskets 55 are sleeved on the root of the connecting pipe 52. The sealing gaskets 55 are made of fluororubber, which is resistant to high temperature and oil, and are fixedly set at the connection between the oil injection hole 51 and the threaded sleeve 1 to form a seal. When the parking brake is applied, the motor starts and outputs rotational torque, which is transmitted to the screw 2 through the transmission rod 61 and the connecting plate 3, causing the screw 2 to rotate synchronously. Since the screw sleeve 1 is subject to the EPB caliper (existing technology is used to limit the circumferential movement of the screw sleeve 1, which is omitted here), it cannot rotate with the screw 2. Under the action of thread engagement, the screw sleeve 1 moves forward along the screw 2 axis, pushing the piston to clamp the brake disc and achieve parking.

[0026] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A novel EPB screw and sleeve assembly, comprising a sleeve (1), a screw (2), and a connecting plate (3), wherein the screw (2) is fixedly connected to one side of the connecting plate (3), and the sleeve (1) is threaded onto the outside of the screw (2), characterized in that: The end of the threaded sleeve (1) is provided with a stroke start positioning structure (4), the outer wall of the threaded sleeve (1) is provided with a lubrication and oil injection structure (5), the rear side of the connecting plate (3) is provided with a motor docking structure (6), the stroke start positioning structure (4) includes a reserved hole (41) and a reinforcing rib (43), the reserved hole (41) is fixedly opened on one side of the outer wall of the threaded sleeve (1), the interior of the reserved hole (41) is slidably connected with a guide rod (42), and the two reinforcing ribs (43) are fixedly installed on both sides of the inner wall of the threaded sleeve (1).

2. The novel EPB screw sleeve assembly according to claim 1, characterized in that: The end of the guide rod (42) is fixedly connected to the front end of the screw (2), and the two reinforcing ribs (43) are arranged in parallel relative to each other.

3. The novel EPB screw sleeve assembly according to claim 2, characterized in that: The lubrication and oil injection structure (5) includes an oil injection hole (51) and a sealing gasket (55). The two oil injection holes (51) are fixedly opened at both ends of the outer wall of the threaded sleeve (1). The outer side of the two oil injection holes (51) is fixedly connected to a connecting pipe (52). The two sealing gaskets (55) are sleeved on the root of the connecting pipe (52). A sealing column (53) is installed on the inner thread of the connecting pipe (52). A rubber ball (54) is fixedly installed at the lower end of the sealing column (53).

4. The novel EPB screw sleeve assembly according to claim 3, characterized in that: The rubber ball (54) is movably inserted into the inner wall of the oil injection hole (51), and the two sealing gaskets (55) are fixedly installed at the connection between the oil injection hole (51) and the screw sleeve (1).

5. The novel EPB screw sleeve assembly according to claim 4, characterized in that: The motor docking structure (6) includes a transmission rod (61) and a support plate (62). The transmission rod (61) is fixedly installed on the outer wall of the connecting plate (3). The other end of the transmission rod (61) is fixedly connected to the support plate (62). The outer wall of the support plate (62) is fixedly connected to a mounting flange (63). The inner side of the mounting flange (63) is threaded with multiple locking bolts (64).

6. The novel EPB screw sleeve assembly according to claim 5, characterized in that: The mounting flange (63) is fixedly connected to the motor output shaft by locking bolts (64), and the transmission rod (61) is coaxially configured with the screw (2).

Images