Parking braking mechanism of electronic mechanical braking system

Abstract

The utility model discloses a parking braking mechanism of an electronic mechanical braking system, which is characterized in that a motor is arranged on a supporting shell, and a motor gear and a ratchet wheel are assembled on an output shaft of the motor; the pawl fixing shaft is installed on the supporting shell and used for supporting the pawl. One end of the pawl is assembled on the electromagnet assembly, and the other end is assembled on the pawl fixing shaft and matched with the ratchet wheel; during service braking, the electromagnet assembly is powered on and closed to generate electromagnetic force, the middle shaft of the electromagnet assembly is pushed to eject the pawl upwards, and the ratchet wheel and the pawl are separated; during parking braking, the electromagnet assembly is powered off and has no electromagnetic force, the middle shaft of the electromagnet assembly returns, the pawl installed at one end automatically resets along with the middle shaft, the pawl is clamped in the ratchet wheel groove to lock the mechanism, the motor gear is prevented from overturning, and the parking function is achieved.

Description

Technical Field

[0001] This utility model relates to the automotive field, and in particular to a parking brake mechanism for an electromechanical braking system. Background Technology

[0002] With industry development and technological improvements, automotive braking systems have evolved from initial leather friction brakes to drum and disc brakes, then to mechanical electronic ABS braking systems. Further advancements in electronic control technology have led to the emergence of analog electronic ABS braking systems, ESC (Electronic Stability Control), and EPB (Electronic Parking Brake). As demands for automotive safety and comfort increase, the drawbacks of traditional hydraulic braking systems have become increasingly apparent, including numerous hydraulic lines, large vacuum boosters, complex assembly and layout, complex ABS electronic control systems, and high manufacturing and maintenance costs. In recent years, with the widespread adoption of electric vehicles, research into vehicle drive-by-wire systems has flourished both domestically and internationally. Drive-by-wire braking replaces traditional braking systems with precise electronic sensors and actuators to assist braking, recover energy, and provide brake failure protection, thus overcoming the braking deficiencies of traditional hydraulic brakes in the event of vacuum source failure.

[0003] Braking by wire can be divided into two types: electromechanical braking by wire (EMB) and electro-hydraulic braking by wire (EHB).

[0004] The EHB retains the traditional hydraulic operating mode and is divided into One-box and Two-box schemes depending on whether it is integrated with ABS / ESP. The brake pedal of the EHB is no longer directly connected to the brake wheel cylinder, but uses an electronic brake pedal. That is, the brake pedal has no rigid connection to the braking system, nor is there a hydraulic connection (if there is, it is only as a backup system). Instead, it is only connected to a brake pedal sensor to input a pedal position signal to the computer (ECU).

[0005] Unlike EHB, EMB completely abandons the hydraulic system, replacing it with an electromechanical system. This not only overcomes the inherent defects of hydraulic braking and solves problems such as long brake lines, numerous valve components, slow response, and poor safety in traditional automotive braking systems, but also boasts significant advantages such as smooth load transfer, stable braking performance, fast signal transmission speed, short braking stroke, high transmission efficiency, and short braking response time. With the development of torque motor technology and electronic control technology, the EMB electromechanical braking system, as a new generation of brakes, will become the main development direction of future automotive braking.

[0006] Because the EMB system requires a large braking force and is located in the small wheel hub, and most of the mainstream EMB pre-research parking brake mechanisms also include an additional motor and transmission mechanism, the overall electromechanical system cannot be too small, is inconvenient to install, and has a high cost. Therefore, the parking mechanism needs to be redesigned to adapt to the compact electromechanical braking system. Utility Model Content

[0007] The utility model description section introduces a series of simplified concepts, all of which are simplifications of existing technologies in the field, and will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0008] The technical problem to be solved by this utility model is to provide an electromechanical braking system parking brake mechanism that is easy to install in the wheel hub space, has a simple structure, small size, and realizes the parking function.

[0009] To solve the above-mentioned technical problems, the electromechanical braking system parking brake mechanism provided by this utility model includes:

[0010] Motor 1 is mounted on support housing 10, and motor gear 2 and ratchet 3 are assembled on its output shaft;

[0011] Motor gear 2 transmits the rotational torque of motor 1 to the secondary gear reduction mechanism 11;

[0012] Ratchet 3 is mounted on the output shaft of motor 1 and is locked in place with pawl 5.

[0013] The pawl fixing shaft 4 is mounted on the support housing 10 to support the pawl 5;

[0014] Pawl 5, one end is mounted on electromagnet assembly 8, and the other end is mounted on pawl fixing shaft 4, which works with ratchet 3 to lock and realize parking function.

[0015] Electromagnet assembly 8 is mounted on support housing 10 and controls the ejection and resetting of pawl 5 by electromagnetic force;

[0016] The support housing 10 serves as a housing assembly that supports the entire transmission mechanism and parking mechanism.

[0017] The secondary gear reduction mechanism 11 is mounted on the support housing (10). The deceleration and torque increase drive screw pushes the friction plate of the caliper to perform vehicle braking.

[0018] Preferably, the further improved transmission mechanism of the electromechanical braking system further includes: an E-type retaining ring 6, which fastens the pawl 5 to the pawl fixing shaft 4.

[0019] Preferably, the transmission mechanism of the electromechanical braking system is further improved by including: a cotter pin 7, which serves as the mounting medium for the electromagnet assembly 8 and the pawl 5, facilitating the ejection and resetting of the pawl 5.

[0020] Preferably, the transmission mechanism of the electromechanical braking system is further improved by including: an internal hex bolt 9 to fix the electromagnet assembly 8 to the support housing 10.

[0021] Preferably, the transmission mechanism of the electromechanical braking system is further improved, wherein the motor gear 2 is interference-fitted onto the motor output shaft.

[0022] Preferably, the transmission mechanism of the electromechanical braking system is further improved, with the ratchet 3 being press-fitted onto the motor shaft.

[0023] Preferably, the transmission mechanism of the electromechanical braking system is further improved such that one end of the pawl 5 is fitted onto the pawl fixing shaft 4 with a clearance fit and is fastened with an E-type retaining ring 6 to prevent movement; the other end is assembled onto the electromagnet assembly 8 through a cotter pin 7, so that the pawl 5 can be smoothly pushed out and reset under the action of electromagnetic force.

[0024] Preferably, the transmission mechanism of the electromechanical braking system is further improved by fixing the electromagnet assembly 8 to the support housing 10 with three hexagonal socket bolts 9.

[0025] Preferably, the transmission mechanism of the electromechanical braking system is further improved such that the electromagnet assembly (8) loses its electromagnetic force after being de-energized, and the pawl (5) is locked on the ratchet (3) to form a one-way lock to realize the parking function; after the electromagnet assembly (8) is energized, it pushes out the pawl (5) under the action of electromagnetic force and separates from the ratchet (3) to terminate the parking function, so that the driving brake can be smoothly performed.

[0026] The working principle of this utility model is as follows:

[0027] When the vehicle is braking, the pedal displacement sensor transmits a signal to the ECU. The ECU controls the motor 1 to drive the motor gear 2 to rotate. The motor gear 2 drives the secondary gear reduction mechanism 11 to reduce speed and increase torque. The drive screw pushes the friction plate of the caliper to perform the braking. At this time, the electromagnet assembly 8 is energized and closes to generate electromagnetic force, which pushes the intermediate shaft of the electromagnet assembly 8 to push the pawl 5 upward, so that the ratchet 3 and the pawl 5 are separated. When the vehicle is parked, the electromagnet assembly (8) is de-energized and loses electromagnetic force. The intermediate shaft of the electromagnet assembly 8 returns to its original position, and the pawl 5 installed at one end is also automatically reset. The pawl 5 is locked in the groove of the ratchet (3) to prevent the motor gear 2 from flipping and to realize the parking function, so as to avoid the vehicle from rolling and causing a safety accident.

[0028] The above-described structure and working principle of this utility model can achieve at least the following technical effects;

[0029] 1) This utility model uses a combination of an electromagnet assembly and a ratchet and pawl assembly as a parking mechanism. The ratchet and pawl mechanism still has the characteristics of self-locking, compact structure, impact and vibration resistance, and high cost performance compared with the existing electronic parking mechanism, and its performance still meets the design requirements.

[0030] 2) The ratchet is fixed on the motor shaft. One end of the pawl is mounted on the electromagnet assembly through a cotter pin, and the other end is set on the pawl fixing shaft through an E-type retaining ring. In the free state, the pawl is locked on the ratchet to form a one-way lock to realize the parking function. The installation is simple and convenient.

[0031] 3) The electromagnet assembly is mounted on the support housing by hexagonal bolts. When energized, the electromagnet assembly pushes the pawl upward through its intermediate shaft, causing the pawl to separate from the ratchet and terminate the parking function, thus enabling smooth driving braking. When de-energized, the intermediate shaft of the electromagnet assembly resets, causing the pawl to lock onto the ratchet and lock the mechanism to achieve the parking function.

[0032] 4) This utility model has a simple and compact structure, simple process, high cost performance, and modular design to meet the needs of different vehicle models. Compared with the traditional electronic parking mechanism, it saves production costs better.

[0033] In summary, the parking brake mechanism of this electromechanical braking system can be installed in the unsprung wheel hub of the vehicle. The parking brake mechanism uses a ratchet and pawl that lock when the electromagnet is de-energized to achieve the parking function, and opens when the electromagnet is energized to terminate the parking function, thus allowing for smooth service braking. The electromagnet assembly is fixed to the support housing with bolts. One end of the pawl is mounted to the intermediate shaft of the electromagnet via a cotter pin, and the other end is mounted to the pawl fixing shaft via a retaining ring. In its free state, the pawl is engaged with the ratchet fixed to the motor shaft. This electromechanical braking system parking brake mechanism provides stable parking function, reduces vibration and noise, can work in conjunction with the ECU, has low production costs, and has wide applicability. Attached Figure Description

[0034] The accompanying drawings are intended to illustrate the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the present invention, supplementing the description in the specification. However, these drawings are schematic diagrams not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any of the given embodiments. The drawings should not be construed as limiting or restricting the range of numerical values ​​or properties covered by the exemplary embodiments of the present invention. The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0035] Figure 1 This is a schematic cross-sectional view of the present invention. Figure 1 .

[0036] Figure 2 This is a schematic cross-sectional view of the present invention. Figure 2 .

[0037] Explanation of reference numerals in the attached figures:

[0038] Motor 1;

[0039] Motor gear 2;

[0040] Ratchet 3;

[0041] Pawl fixing shaft 4;

[0042] 5 pawls;

[0043] E-type retaining ring 6;

[0044] Cotter pin 7;

[0045] Electromagnet assembly 8;

[0046] 9.0mm socket head cap screw;

[0047] Support housing 10;

[0048] Two-stage gear reduction mechanism 11. Detailed Implementation

[0049] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can fully understand other advantages and technical effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through different specific embodiments, and various details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. The following exemplary embodiments of this utility model can be implemented in many different forms and should not be construed as limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of this utility model thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art. It should be understood that when an element is referred to as "connected" or "combined" to another element, the element can be directly connected or combined to the other element, or there may be intermediate elements. The difference is that when an element is referred to as "directly connected" or "directly combined" to another element, there are no intermediate elements. Throughout the drawings, the same reference numerals always denote the same elements. As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items. Other terms used to describe relationships between elements or layers (e.g., “between” and “directly between”, “adjacent to” and “directly adjacent to”, “on” and “directly on”, etc.) should be interpreted in the same manner.

[0050] Example

[0051] This utility model provides a parking brake mechanism for an electromechanical braking system, comprising:

[0052] Motor 1 is mounted on support housing 10, and motor gear 2 and ratchet 3 are assembled on its output shaft; motor gear 2 transmits the rotational torque of motor 1 to secondary gear reduction mechanism 11.

[0053] Ratchet 3 is mounted on the output shaft of motor 1 and locks with pawl 5; pawl fixing shaft 4 is mounted on support housing 10 to support pawl 5;

[0054] Pawl 5, one end is mounted on electromagnet assembly 8, and the other end is mounted on pawl fixing shaft 4, which works with ratchet 3 to lock and realize parking function.

[0055] Electromagnet assembly 8 is mounted on support housing 10 and controls the ejection and resetting of pawl 5 by electromagnetic force;

[0056] The support housing 10 serves as a housing assembly that supports the entire transmission mechanism and parking mechanism.

[0057] The secondary gear reduction mechanism 11 is mounted on the support housing (10). The deceleration and torque increase drive screw pushes the friction plate of the caliper to perform vehicle braking.

[0058] Preferably, the above embodiment is further improved by including: an E-type retaining ring 6, which fastens the pawl 5 to the pawl fixing shaft 4.

[0059] Preferably, the above embodiment is further improved by including: a cotter pin 7, which serves as the mounting medium for the electromagnet assembly 8 and the pawl 5, facilitating the ejection and resetting of the pawl 5.

[0060] Preferably, the above embodiment is further improved by including: an internal hex bolt 9 to fix the electromagnet assembly 8 to the support housing 10.

[0061] Alternatively, in the above embodiment, the motor gear 2 is interference-fitted onto the motor output shaft.

[0062] Alternatively, in the above embodiments, the ratchet 3 is press-fitted onto the motor shaft.

[0063] Alternatively, in the above embodiment, one end of the pawl 5 is fitted with a clearance fit on the pawl fixing shaft 4 and secured with an E-type retaining ring 6 to prevent movement; the other end is fitted to the electromagnet assembly 8 through a cotter pin 7, so that the pawl 5 can be smoothly ejected and reset under the action of electromagnetic force.

[0064] Alternatively, in the above embodiment, the electromagnet assembly 8 is fixed to the support housing 10 by three hexagon socket bolts 9.

[0065] Alternatively, in the above embodiments, after the electromagnet assembly (8) is de-energized, it loses the electromagnetic force and the pawl (5) is locked on the ratchet (3) to form a one-way lock to realize the parking function; after the electromagnet assembly (8) is energized, it pushes out the pawl (5) under the action of electromagnetic force and separates from the ratchet (3) to terminate the parking function and thus smoothly carry out the driving brake.

[0066] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and not as having an idealized or overly formal meaning.

[0067] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the present invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A parking brake mechanism for an electromechanical braking system, characterized in that, include: The motor (1) is mounted on the support housing (10), and its output shaft is equipped with a motor gear (2) and a ratchet (3); The motor gear (2) transmits the rotational torque of the motor (1) to the gear reduction mechanism (11); Ratchet (3) is mounted on the motor shaft and engages with pawl (5); The pawl fixing shaft (4) is installed on the support housing (10) to support the pawl (5); The pawl (5) is mounted on the electromagnet assembly (8) at one end and on the pawl fixing shaft (4) at the other end, and cooperates with the ratchet (3). An electromagnet assembly (8) is installed on a support housing (10) and controls the ejection and resetting of the pawl (5) by electromagnetic force. The two-stage gear reduction mechanism (11) is mounted on the support housing (10). The deceleration and torque increase drive screw pushes the friction plate of the caliper to perform the service braking.

2. The parking brake mechanism of the electromechanical braking system as described in claim 1, characterized in that, Also includes: The E-type retaining ring (6) secures the pawl (5) to the pawl fixing shaft (4).

3. The parking brake mechanism of the electromechanical braking system as described in claim 1, characterized in that, Also includes: The cotter pin (7) serves as the mounting medium for the electromagnet assembly (8) and the pawl (5), facilitating the ejection and resetting of the pawl (5).

4. The parking brake mechanism of the electromechanical braking system as described in claim 1, characterized in that, Also includes: Use hex bolts (9) to fix the electromagnet assembly (8) to the support housing (10).

5. The parking brake mechanism of the electromechanical braking system as described in claim 1, characterized in that: The motor gear (2) is press-fitted onto the motor output shaft.

6. The parking brake mechanism of the electromechanical braking system as described in claim 1, characterized in that: The ratchet (3) is press-fitted onto the motor output shaft.

7. The parking brake mechanism of the electromechanical braking system as described in claim 1, characterized in that: One end of the pawl (5) is fitted with a clearance fit on the pawl fixing shaft (4) and secured with an E-type retaining ring (6) to prevent movement; the other end is fitted to the electromagnet assembly (8) through a cotter pin (7) so that the pawl (5) can be smoothly ejected and reset under the action of electromagnetic force.

8. The parking brake mechanism of the electromechanical braking system as described in claim 1, characterized in that: The electromagnet assembly (8) is fixed to the support housing (10) by three hex bolts (9).

9. The parking brake mechanism of the electromechanical braking system as described in claim 1, characterized in that: When the electromagnet assembly (8) is de-energized, it loses its electromagnetic force and the pawl (5) is locked onto the ratchet (3) to form a one-way lock to realize the parking function. When the electromagnet assembly (8) is energized, it pushes out the pawl (5) under the action of electromagnetic force and separates from the ratchet (3) to terminate the parking function and thus smoothly carry out the driving brake.

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