Low noise wire controlled brake power unit

Abstract

The utility model belongs to the field of vehicle brake, especially relates to a low noise line control brake power unit. It includes motor, the motor includes casing, stator and rotor that set up in the casing, the rotor is equipped with hollow cavity along the axis, is equipped with a plurality of transmission teeth on the inner wall of the inner end of cavity along the circumference, still includes elastic buffer piece, and with the embedding cooperation of elastic buffer piece one transmission part, transmission part includes the transmission shaft that cooperates in the through -hole, transmission shaft is equipped with transmission hole along the axis, be equipped with embedding body on transmission shaft, embedding body's peripheral surface is equipped with embedding tooth, embedding body and embedding tooth embedding cooperation recess and transmission cavity, one end of screw rod is connected in transmission hole, the utility model has carried out the improvement to the connecting structure of motor and screw rod, sets up the elastic buffer piece and transmission part to realize the connection of screw rod and rotor, on one hand, has realized the transmission of power, on the other hand, plays the buffering effect simultaneously in the circumference and axial direction, has reduced the vibration noise level.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle braking, and specifically relates to a low-noise drive-by-wire power unit. Background Technology

[0002] With the continuous development of vehicle electrification and intelligence, the demand for electromechanical-hydraulic servo braking systems is also increasing, among which the drive-by-wire braking power unit is the core component of the entire system.

[0003] In the design of the power unit structure of a brake-by-wire system, a common approach is to use a hollow shaft motor with an internal ball screw. Currently, existing products assemble the hollow shaft motor and the ball screw using a rigid connection. This method causes the vibration of the ball screw during operation to be directly transmitted to the motor, and then from the motor to the assembly and the external space. To meet vibration and noise requirements, this approach demands extremely high precision from both the motor and the ball screw, leading to increased costs. Furthermore, the vibrations of the motor and the ball screw during operation can couple, making the vibration and noise problem more complex. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention improves the connection structure between the motor and the lead screw. The connection between the lead screw and the rotor is achieved by setting up elastic buffers and transmission components. On the one hand, this realizes the transmission of power, and on the other hand, it plays a buffering role in both the circumferential and axial directions, reducing the level of vibration and noise.

[0005] The technical solution of this utility model is as follows:

[0006] A low-noise linear control power unit includes a motor, which includes a housing, a stator and a rotor disposed within the housing. The rotor has a hollow cavity with one open end along its axis. A plurality of transmission teeth are provided circumferentially on the inner wall of the rotor away from the open end. The unit also includes an elastic buffer member with a through hole on its axis and a plurality of transmission teeth on its circumferential surface. The elastic buffer member is installed in the cavity, and the transmission teeth engage with the transmission teeth. A concave cavity is provided on the end face of the elastic buffer member, and the transmission teeth have a transmission cavity communicating with the concave cavity. The unit also includes a transmission component, which includes a transmission shaft fitted into the through hole. The transmission shaft has a transmission hole along its axis and an insert on the transmission shaft. The insert has insert teeth on its circumferential surface. The insert and insert teeth are embedded in the mating concave cavity and the transmission cavity. One end of a lead screw is connected to the transmission hole.

[0007] Furthermore, the bottom surface of the cavity has several protrusions distributed circumferentially.

[0008] Furthermore, the rotor has a connecting through hole at its inner end, a connecting sleeve on the outer wall of the rotor's inner end, a clearance slope at the edge of the connecting through hole located in the cavity, a second clearance slope on the end face of the drive shaft away from the insert, and the outer diameter of the drive shaft is larger than the inner diameter of the connecting through hole.

[0009] Furthermore, it also includes a lead screw nut connected to the lead screw, wherein the lead screw nut and the insert are provided with lead screw nut stop blocks on their opposing surfaces.

[0010] Furthermore, the elastic buffer is made of rubber material.

[0011] Furthermore, the transmission component is made of metal.

[0012] In summary, this utility model has the following beneficial effects:

[0013] This invention improves the connection structure between the lead screw and the rotor. Transmission teeth are added to the inner wall of the rotor, and power transmission between the rotor and the lead screw is achieved through an elastic buffer and a transmission component. Simultaneously, the elastic buffer creates a connection zone between the lead screw and the rotor, providing a flexible connection. The vibration of the lead screw is not directly transmitted to the motor's rotor, thus avoiding vibration coupling between the motor and the lead screw during operation. This effectively improves the noise level of the power unit. Furthermore, the improvement in noise also reduces the precision requirements for the lead screw and the motor, facilitating better control of their manufacturing costs. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the drive-by-wire power unit of this utility model.

[0015] Figure 2 This is a half-sectional perspective view of the drive-by-wire power unit of this utility model.

[0016] Figure 3 This is an exploded view of the lead screw, elastic buffer, and transmission components.

[0017] Figure 4 This is an exploded view of the lead screw, elastic buffer, and transmission components from another perspective.

[0018] In the diagram, 1 represents the motor, 10 represents the housing, 12 represents the rotor, 120 represents the cavity, and 13 represents the transmission gear.

[0019] 14 is an elastic buffer, 140 is a through hole, 141 is a transmission tooth, 142 is a cavity, 1420 is a transmission cavity, 15 is a transmission component, 150 is a transmission shaft, 151 is a transmission hole, 152 is an insert, 153 is an insert tooth, 1421 is a protrusion, 120 is a connecting through hole, 121 is a connecting sleeve, 1201 is a relief slope, 1501 is a second relief slope, 20 is a nut, and 3 is a nut stop block. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0021] It should be noted that when a component is referred to as being "set on" or "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "fixed to" another component, or "fixedly connected" to another component, the fixing method can be detachable or non-detachable. When a component is considered to be "connected" or "rotatably connected" to another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and similar expressions used are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] In this invention, terms such as "first," "second," and "third" are used not to represent specific quantities or orders, but merely to distinguish names.

[0024] This utility model relates to a power unit for wire control. In the prior art, the lead screw of the power unit for wire control is directly connected to the rotor of the motor. The vibration of the lead screw during the movement process will be transmitted to the motor. Therefore, the prior art focuses on improving the machining accuracy of the lead screw to reduce the vibration generated during the movement of the lead screw. This results in high machining accuracy requirements and high machining costs for the lead screw.

[0025] Figure 1 This is a three-dimensional schematic diagram of the drive-by-wire power unit of this utility model. Figure 2 This is a half-sectional perspective view of the drive-by-wire power unit of this utility model. Figure 3This is an exploded view of the lead screw, elastic buffer, and transmission components. Figure 4 This is an exploded view of the lead screw, elastic buffer, and transmission components from another perspective.

[0026] A low-noise linear control power unit includes a motor 1, which includes a housing 10, a stator 11 and a rotor 12 disposed within the housing. The rotor 12 has a hollow cavity 120 with one open end along its axis. A plurality of transmission teeth 13 are provided circumferentially on the inner wall of the rotor away from the open end. The unit also includes an elastic buffer 14, which has a through hole 140 on its axis. A plurality of transmission teeth 141 are provided on the circumferential surface of the elastic buffer 14. The elastic buffer 14 is installed within the cavity, and the transmission teeth 141 are engaged with… The transmission gear 13 is engaged, and the end face of the elastic buffer 14 is provided with a cavity 142, and the transmission gear 141 is provided with a transmission cavity 1420 communicating with the cavity. It also includes a transmission member 15, which includes a transmission shaft 150 engaged in the through hole. The transmission shaft 150 is provided with a transmission hole 151 along the axis. The transmission shaft 150 is provided with an insert 152, and the circumferential surface of the insert 152 is provided with an insert tooth 153. The insert 152 and the insert tooth 153 are embedded in the engagement cavity and the transmission cavity. One end of the lead screw 2 is connected in the transmission hole 151.

[0027] This invention improves the linear control power unit by adding an elastic buffer and a transmission component to achieve power transmission between the rotor and the lead screw. On the one hand, the elastic buffer, through its concave cavity and transmission cavity, covers the outer wall of the transmission component, enabling transmission between the transmission component and the rotor's transmission teeth. On the other hand, through the conformal transmission teeth and the cooperation between the transmission teeth and the embedded teeth, power is transmitted from the rotor to the lead screw. At the same time, the elastic buffer isolates the influence of the lead screw's vibration on the rotor in the axial and circumferential directions, thus ensuring that their vibrations do not affect each other. This reduces the precision requirements of the lead screw and motor, facilitates manufacturing, and lowers the production cost of the product. Furthermore, the vibration isolation provided by the elastic buffer overcomes the complex vibration noise problem caused by vibration coupling in the prior art, effectively reducing the vibration noise level of the power unit.

[0028] The bottom surface of the cavity 142 has a plurality of protrusions 1421 circumferentially distributed. The protrusions are circumferentially distributed on the bottom surface of the cavity and abut against the surface of the insert of the drive shaft. During the axial assembly of the lead screw, the protrusions can provide a larger compression margin, which facilitates the assembly of the lead screw. After the lead screw is assembled, the protrusions tend to spring back, thereby achieving a pre-tightened state after the lead screw is assembled and reducing the axial vibration margin of the lead screw, thereby reducing the generation of vibration noise.

[0029] The rotor 12 has a connecting through hole 120 at its inner end and a connecting sleeve 121 on the outer wall of its inner end. The edge of the connecting through hole 120 in the cavity has a clearance slope 1201. A second clearance slope 1501 is provided on the end face of the drive shaft 150 away from the insert. The outer diameter of the drive shaft 150 is larger than the inner diameter of the connecting through hole 120. During the assembly of the lead screw, the lead screw fits in the drive hole of the drive shaft and has an axial movement process in the connecting through hole. Therefore, the first and second clearance slopes are provided to extend the axial movement distance of the lead screw. However, since the outer diameter of the drive shaft is larger than the inner diameter of the connecting through hole, the length of the axial movement distance of the lead screw is limited, which in turn limits the axial deformation of the elastic buffer, thereby limiting the axial force borne by the elastic buffer and ensuring that it will not be crushed.

[0030] Furthermore, it also includes a lead screw nut 20 connected to the lead screw 2. The lead screw nut and the insert are provided with lead screw nut stop blocks 3 on their opposite surfaces. The lead screw nut stop blocks are used to limit the stroke of the lead screw nut.

[0031] The elastic buffer 14 is made of rubber material. The elastic buffer made of rubber material has good shock absorption capacity and can also withstand a certain pressure to transmit power.

[0032] The transmission component 15 is made of metal. The materials of the elastic buffer and the transmission component are specified here. The elastic buffer is made of rubber and has good buffering capacity. The transmission component is made of metal and has good rigidity to meet the requirements of power transmission.

[0033] In summary, this utility model has the following beneficial effects:

[0034] This invention improves the connection structure between the lead screw and the rotor. Transmission teeth are added to the inner wall of the rotor, and power transmission between the rotor and the lead screw is achieved through an elastic buffer and a transmission component. Simultaneously, the elastic buffer creates a connection zone between the lead screw and the rotor, providing a flexible connection. The vibration of the lead screw is not directly transmitted to the motor's rotor, thus avoiding vibration coupling between the motor and the lead screw during operation. This effectively improves the noise level of the power unit. Furthermore, the improvement in noise also reduces the precision requirements for the lead screw and the motor, facilitating better control of their manufacturing costs.

[0035] Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A low-noise linear control power unit, comprising a motor, the motor including a housing, a stator and a rotor disposed within the housing, characterized in that: The rotor has a hollow cavity with one open end along its axis. Several transmission teeth are arranged circumferentially on the inner wall of the rotor away from the open end. It also includes an elastic buffer member with a through hole on its axis and several transmission teeth on its circumferential surface. The elastic buffer member is installed in the cavity, and the transmission teeth engage with the transmission teeth. A recess is provided on the end face of the elastic buffer member, and the transmission teeth have a transmission cavity communicating with the recess. The rotor also includes a transmission member, comprising a transmission shaft fitted within the through hole. The transmission shaft has a transmission hole along its axis and an insert on the transmission shaft. Insert teeth are provided on the circumferential surface of the insert. The insert and insert teeth are embedded into the mating recess and the transmission cavity. One end of a lead screw is connected to the transmission hole.

2. The low-noise linear control dynamic unit according to claim 1, characterized in that: The bottom surface of the cavity has several protrusions distributed circumferentially.

3. The low-noise linear motion control unit according to claim 1, characterized in that: The rotor has a connecting through hole at its inner end and a connecting sleeve on the outer wall of its inner end. The edge of the connecting through hole located in the cavity has a clearance slope. A second clearance slope is provided on the end face of the drive shaft away from the insert. The outer diameter of the drive shaft is larger than the inner diameter of the connecting through hole.

4. The low-noise linear motion control unit according to claim 1, characterized in that: It also includes a lead screw nut connected to the lead screw, and both the lead screw nut and the insert have lead screw nut stop blocks on their opposite surfaces.

5. A low-noise linear motion control unit according to any one of claims 1-4, characterized in that: The elastic buffer is made of rubber material.

6. A low-noise linear motion control unit according to any one of claims 1-4, characterized in that: The transmission component is made of metal.

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