Parking mechanism of electronic mechanical brake and electronic mechanical brake

Abstract

The utility model discloses a parking mechanism of an electronic mechanical brake and the electronic mechanical brake, the brake comprises an MGU assembly, the MGU assembly comprises a shell and a brake motor, the brake motor is provided with a motor shaft, the parking mechanism comprises a ratchet wheel fixedly arranged on the motor shaft and a pawl rotatably arranged in the shell, and the pawl can be matched with or separated from the ratchet wheel; the parking mechanism comprises an electromagnetic valve driving mechanism enabling the pawl to be matched with the ratchet wheel, the electromagnetic valve driving mechanism comprises a valve body, a coil, a static iron core, a movable iron core and a push rod fixedly arranged on the movable iron core, and the push rod is movably connected with or matched with the pawl. When the coil is powered on, the push rod moves in the direction extending out of the valve body to enable the ratchet wheel to be matched with the pawl. When the coil is powered off, the ratchet wheel can be separated from the pawl; the electromagnetic valve driving mechanism further comprises a return spring which enables the push rod to move in the direction of retracting into the valve body when the coil is powered off, the return spring is arranged in the valve body, and the two ends of the return spring are arranged on the movable iron core and the static iron core respectively. The parking mechanism is low in cost and low in noise.

Description

Technical Field

[0001] This utility model relates to the field of vehicle braking equipment technology, specifically to a parking mechanism and an electromechanical brake. Background Technology

[0002] With the rapid advancement of brake-by-wire products, the commercialization of electromechanical brakes in vehicles is also progressing faster. Electromechanical brakes include both service braking and parking braking functions. Given the current constraints on wheel-side space, one of the challenges in the commercial application of electromechanical brakes is how to better adapt to wheel-side space using more highly integrated components and a more compact spatial arrangement while ensuring parking functionality.

[0003] In the existing technology, the parking mechanism in electromechanical brakes generally uses a bistable electromagnet as the parking power source, combined with a ratchet and pawl mechanism. This parking mechanism is expensive, and when parking, there is an unavoidable sound of the electromagnet engaging. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a parking mechanism for an electromechanical brake that is highly integrated, low-cost, and low-noise.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A parking mechanism for an electromechanical brake, the electromechanical brake including an MGU assembly, the MGU assembly including a housing and a brake motor mounted on the housing, the brake motor having a motor shaft, the parking mechanism including a ratchet fixedly mounted on the motor shaft and a pawl rotatably mounted within the housing; the parking mechanism has a parking state and a released state, when the parking mechanism is in the parking state, the ratchet engages with the pawl; when the parking mechanism is in the released state, the ratchet disengages from the pawl;

[0007] The parking mechanism further includes a solenoid valve drive mechanism for driving the pawl to rotate relative to the housing to put the parking mechanism in a parking state. The solenoid valve drive mechanism includes a valve body fixedly disposed in the housing, a coil fixedly disposed in the valve body, a stationary iron core fixedly disposed in the valve body, a movable iron core slidably disposed in the valve body, and a push rod fixedly disposed on the movable iron core. One end of the push rod is provided with a connecting part, which is located outside the valve body. The connecting part is movably connected to or cooperates with the pawl.

[0008] When the coil is energized, the push rod moves outward from the valve body, causing the ratchet to engage with the pawl; when the coil is de-energized, the ratchet disengages from the pawl; the solenoid valve drive mechanism also includes a return spring that drives the push rod to retract into the valve body when the coil is de-energized, the return spring being disposed within the valve body, and the two ends of the return spring being respectively disposed on the moving iron core and the stationary iron core.

[0009] In some embodiments, the parking mechanism further includes a limiting part fixedly disposed on the housing. The limiting part is located on the rotation path of the pawl when it engages with the ratchet. When the parking mechanism is in the parking state, the pawl engages with the limiting part and the ratchet respectively, so that the parking mechanism remains in the parking state when the coil is de-energized.

[0010] In some embodiments, the pawl includes a rod and pawl teeth disposed at one end of the rod. The ratchet has a plurality of circumferentially distributed tooth grooves. When the parking mechanism is held in the parking state, the pawl teeth are located in one of the tooth grooves, and one side of the pawl teeth abuts against one side of the tooth groove. The rod abuts against the limiting portion. On the pawl, the side of the pawl teeth abutting against the tooth groove and the side of the rod abutting against the limiting portion are respectively located on opposite sides of the pawl.

[0011] In some embodiments, the pawl includes pawl teeth, and the ratchet has a plurality of circumferentially distributed tooth grooves; when the parking mechanism is in the parking state, the pawl teeth are located in one of the tooth grooves; when the parking mechanism is in the released state, the pawl teeth disengage from all of the tooth grooves.

[0012] In some embodiments, the pawl tooth is a helical tooth, and the tooth groove is a helical tooth groove that cooperates with the helical tooth, so that when the parking mechanism is in the parking state, the motor shaft cannot rotate in the parking release direction.

[0013] In some embodiments, a limiting structure for limiting the rotation of the push rod is provided between the push rod and the valve body. The limiting structure includes a limiting member fixedly disposed on the valve body. A first mating part is provided at the other end of the push rod, and a second mating part is provided on the limiting member. The first mating part and the second mating part abut against each other.

[0014] In some embodiments, one of the pawl and the connecting portion is provided with a pivot, and the other is provided with a groove. The pivot is rotatable and slidably disposed in the groove along the length extension direction of the groove, so that the pawl and the connecting portion can be rotatably and slidably connected.

[0015] In some embodiments, the pawl and the connecting portion are connected by a ball joint omnidirectional rotation.

[0016] In some embodiments, the connection between the pawl and the housing, and the connection between the pawl and the connecting portion, are located at both ends along the length of the pawl.

[0017] This utility model also provides an electromechanical brake, which has a parking mechanism as described in any of the above claims.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: In the parking mechanism of the electromechanical brake of this utility model, a one-way electromagnet is used as the parking power source to drive the pawl to cooperate with the ratchet to achieve parking, and the pawl is driven to return to its original position by the return spring inside the one-way electromagnet. Compared with the prior art, this technical solution simplifies the structure of the parking mechanism, improves the integration of the mechanism, and also reduces the cost of the structure accordingly. In addition, during the parking action, the return spring set between the moving iron core and the stationary iron core can avoid the electromagnet's engagement sound, thereby reducing noise. Attached Figure Description

[0019] Appendix Figure 1 This is a three-dimensional schematic diagram of the electromechanical brake in this embodiment;

[0020] Appendix Figure 2 This is a three-dimensional schematic diagram of the electromechanical actuator of this embodiment after removing part of its structure.

[0021] Appendix Figure 3 This is a schematic diagram of the parking mechanism of the electromechanical brake in this embodiment (the parking mechanism is in the released state);

[0022] Appendix Figure 4 This is a schematic diagram of the parking mechanism of the electromechanical brake in this embodiment (the parking mechanism is in the parking state);

[0023] Appendix Figure 5 This is a cross-sectional schematic diagram of the solenoid valve drive mechanism in this embodiment;

[0024] Appendix Figure 6 This is a three-dimensional schematic diagram of the solenoid valve drive mechanism in this embodiment.

[0025] The components are as follows: 1. Housing; 11. Limiting part; 2. Motor shaft; 3. Ratchet; 31. Tooth groove; 4. Pawl; 41. Rod body; 42. Pawl tooth; 43. Slide groove; 5. Solenoid valve drive mechanism; 51. Valve body; 52. Coil; 53. Stationary iron core; 54. Moving iron core; 55. Push rod; 551. Connecting part; 552. First mating part; 56. Return spring; 6. Rotating shaft; 7. Limiting element; 71. Second mating part. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a full understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present utility model. Therefore, the present utility model is not limited to the specific embodiments disclosed below.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] like Figure 1 As shown, the electromechanical brake includes an MGU assembly, which includes a housing 1 and a brake motor mounted on the housing 1. The brake motor includes a motor shaft 2.

[0033] like Figures 1-4 As shown, the parking mechanism of the electromechanical brake of this utility model includes a ratchet 3, a pawl 4, and a solenoid valve drive mechanism 5.

[0034] The ratchet 3 is fixedly mounted on the motor shaft 2. When the brake motor starts and the motor shaft 2 rotates, it drives the ratchet 3 to rotate synchronously. The pawl 4 is rotatably mounted on the housing 1.

[0035] The parking mechanism has a parking state and a released state. When the parking mechanism is in the parking state, ratchet 3 and pawl 4 engage, thereby limiting the rotation of motor shaft 2 through the engagement of ratchet 3 and pawl 4. Figure 4 As shown. When the parking mechanism is in the released state, ratchet 3 disengages from pawl 4, as... Figure 3 As shown.

[0036] Specifically, the ratchet 3 has multiple toothed grooves 31 evenly distributed along its circumferential direction on its outer peripheral surface. The pawl 4 includes a rod 41 and pawl teeth 42 disposed at one end of the rod 41. When the parking mechanism is in the parking state, the pawl teeth 42 are located in one toothed groove 31, such as... Figure 4 As shown. When the parking mechanism is in the released state, the ratchet teeth 42 disengage from all the tooth slots 31, as... Figure 3 As shown.

[0037] The solenoid valve drive mechanism 5 is used to drive the pawl 4 to rotate to a state that engages with the ratchet 3, thereby putting the parking mechanism into a parking state.

[0038] Specifically, such as Figure 5 As shown, the solenoid valve drive mechanism 5 includes a valve body 51, a coil 52, a stationary iron core 53, a moving iron core 54, and a push rod 55.

[0039] The valve body 51 is fixedly installed inside the housing 1. The coil 52 is fixedly installed inside the valve body 51. The stationary iron core 53 is also fixedly installed inside the valve body 51. The moving iron core 54 is slidably installed inside the valve body 51. The moving iron core 54 is sleeved on the push rod 55 and fixedly installed relative to the push rod 55. The push rod 55 extends out of the valve body 51, and one end of the push rod 55 is provided with a connecting part 551. The connecting part 551 is located outside the valve body 51 and is movably connected to or engaged with the pawl 4.

[0040] When coil 52 is energized, it generates a magnetic field, magnetizing the moving iron core 54. Under the magnetic force of the stationary iron core 53, the moving iron core 54 slides within the valve body 51, causing the push rod 55 to slide synchronously relative to the valve body 51, gradually pushing the push rod 55 to the outside of the valve body 51. When the push rod 55 moves, it acts on the pawl 4, causing the pawl 4 to rotate relative to the housing 1 until the pawl teeth 42 engage in a tooth groove 31, at which point the parking mechanism is in the parking state.

[0041] In this embodiment, the magnetism of the moving iron core 54 after being magnetized is opposite to that of the stationary iron core 53. When the coil 52 is energized, the moving iron core 54 slides towards the stationary iron core 53, thereby pushing the push rod 55 towards the direction of extending out of the valve body 51.

[0042] The solenoid valve drive mechanism 5 also includes a return spring 56. When the coil 52 is de-energized, the return spring 56 drives the push rod 55 to retract into the valve body 51, thereby moving the pawl 4 away from the ratchet 3. The return spring 56 is located inside the valve body 51, and its two ends are respectively located on the moving iron core 54 and the stationary iron core 53. The return spring 56 located between the moving iron core 54 and the stationary iron core 53 can also prevent the moving iron core 54 and the stationary iron core 53 from directly contacting each other when the coil 52 is energized and the moving iron core 54 slides towards the stationary iron core 53, thus avoiding the electromagnet engagement sound and reducing noise.

[0043] The parking mechanism also includes a limiting part 11 fixedly mounted on the housing 1, which is located on the rotation path of the pawl 4 when it engages with the ratchet 3. When the parking mechanism is in the parking state and the coil 52 is de-energized, the pawl 4 engages with both the limiting part 11 and the ratchet 3, thereby limiting the position of the pawl 4 and maintaining the position of the push rod 55, preventing it from returning to its original position under the action of the return spring 56. This keeps the parking mechanism in the parking state.

[0044] Specifically, when the parking mechanism is in the parking state, one side of the pawl tooth 42 abuts against one side of the tooth groove 31, and the lever 41 abuts against the limiting part 11. On the pawl 42, the side of the pawl tooth 42 that abuts against the tooth groove 31 and the side of the lever 41 that abuts against the limiting part 11 are located on opposite sides of the pawl 4, thus limiting the position of the pawl 4.

[0045] In addition to keeping the parking mechanism in a parking state and limiting the theoretical movement trajectory of the pawl 4 when the coil 52 is de-energized, the limiting part 11 can also withstand the load caused by the movement trend. This avoids the load acting on the solenoid valve drive mechanism 5, thereby reducing the strength requirements of the solenoid valve drive mechanism 5 and reducing the manufacturing cost of the solenoid valve drive mechanism 5.

[0046] In this embodiment, the pawl tooth 42 is a helical tooth, and correspondingly, each tooth groove 31 is a helical tooth groove that mates with the helical tooth. Thus, when the parking mechanism is in the parking state and the coil 52 is de-energized, the engagement of the helical teeth and the straight surfaces in the helical tooth grooves prevents the motor shaft 42 from driving the ratchet 3 to rotate in the parking release direction A. However, when the motor shaft 42 drives the ratchet 3 to rotate in the parking clamping direction B, the engagement of the helical teeth and the inclined surfaces in the helical tooth grooves drives the pawl 42 to rotate relative to the housing 1, thereby causing the pawl tooth 42 to disengage from the tooth groove 31.

[0047] The connecting part 551 can be integrally set with the push rod 55, or it can be fixedly connected to the push rod 55 by means of threaded connection, interference fit connection or other methods.

[0048] There are several ways in which the connecting part 551 can be connected or engaged with the pawl 4. Several specific implementation methods are given below.

[0049] In one embodiment, the pawl 4 and the connecting part 551 are rotatably and slidably connected. Specifically, one of the pawl 4 and the connecting part 551 is provided with a rotating shaft 6, and the other is provided with a sliding groove 43. The rotating shaft 6 is rotatably and slidably disposed in the sliding groove 43 along the length extension direction of the sliding groove 43.

[0050] In another embodiment, the pawl 4 and the connecting part 551 are connected by a ball joint universal joint.

[0051] Preferably, the connection between the pawl 4 and the housing 1, and the connection between the pawl 4 and the connecting part 551, are located at the two ends along the length of the pawl 4. This arrangement makes parking the vehicle easier to park.

[0052] In this embodiment, the push rod 55 has a circular cross-section, which facilitates the manufacturing of the solenoid valve drive mechanism 5. To prevent the push rod 55 from rotating relative to the valve body 51 around its own axis when the pawl 4 rotates, a limit structure is provided between the push rod 55 and the valve body 51. Figure 6 As shown, the limiting structure includes a limiting member 7 fixedly mounted on the valve body 51, a first mating part 552 provided at the other end of the push rod 55, and a second mating part 71 provided on the limiting member 7. The first mating part 552 and the second mating part 71 abut against each other.

[0053] In this embodiment, the limiting member 7 is embedded in the valve body 51 and slidably sleeved on the other end of the push rod 55. The first mating part 552 is a flat surface provided on the push rod 55, and the second mating part 71 is a plane that mates with the flat surface. The first mating part 552 and the second mating part 71 may also adopt other structural forms.

[0054] The parking mechanism works as follows:

[0055] Initially, the parking mechanism is in the released state, meaning that the pawl 4 is moved away from the ratchet 3 by the return spring 56. Figure 3 As shown.

[0056] When parking is required, the motor shaft 2 drives the ratchet 3 to rotate a certain angle in the parking clamping direction B, energizing the coil 52. The moving iron core 54 slides within the valve body 51, pushing the push rod 55 outwards from the valve body 51. This causes the pawl 4 to rotate relative to the housing 1 towards the ratchet 3 until the pawl teeth 42 engage in a tooth groove 31, at which point the parking mechanism is in the parking state. Figure 4 As shown. At this time, when the motor shaft 2 stops rotating, due to the interaction of forces, the ratchet 3 tends to rotate in the parking release direction A, so that the pawl teeth 42 and the tooth groove 31 are engaged in abutment with each other. At the same time, the rod body 41 of the pawl 4 is also engaged with the limiting part 11, so that the parking mechanism remains in the parking state after the coil 52 is de-energized.

[0057] When the parking mechanism needs to be released, the motor shaft 2 drives the ratchet 3 to rotate in the parking clamping direction B. Through the engagement of the helical teeth and the inclined surfaces of the helical tooth groove in the pawl 42 and the tooth groove 31, the pawl 42 is driven to rotate relative to the housing 1, thereby causing the pawl 42 to disengage from the tooth groove 31, and the parking mechanism is then in the released state. Figure 4 As shown. At this time, the push rod 55 slides back to the valve body 51 under the action of the return spring 56, driving the pawl 4 to rotate relative to the housing 1 in a direction away from the ratchet 3.

[0058] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A parking mechanism for an electromechanical brake, the electromechanical brake comprising an MGU assembly, the MGU assembly comprising a housing and a brake motor disposed on the housing, the brake motor having a motor shaft, characterized in that: The parking mechanism includes a ratchet fixedly mounted on the motor shaft and a pawl rotatably mounted within the housing; the parking mechanism has a parking state and a released state. When the parking mechanism is in the parking state, the ratchet engages with the pawl; when the parking mechanism is in the released state, the ratchet disengages from the pawl. The parking mechanism further includes a solenoid valve drive mechanism for driving the pawl to rotate relative to the housing to put the parking mechanism in a parking state. The solenoid valve drive mechanism includes a valve body fixedly disposed in the housing, a coil fixedly disposed in the valve body, a stationary iron core fixedly disposed in the valve body, a movable iron core slidably disposed in the valve body, and a push rod fixedly disposed on the movable iron core. One end of the push rod is provided with a connecting part, which is located outside the valve body. The connecting part is movably connected to or cooperates with the pawl. When the coil is energized, the push rod moves outward from the valve body, causing the ratchet to engage with the pawl; when the coil is de-energized, the ratchet disengages from the pawl; the solenoid valve drive mechanism also includes a return spring that drives the push rod to retract into the valve body when the coil is de-energized, the return spring being disposed within the valve body, and the two ends of the return spring being respectively disposed on the moving iron core and the stationary iron core.

2. The parking mechanism of the electromechanical brake according to claim 1, characterized in that: The parking mechanism also includes a limiting part fixedly disposed on the housing. The limiting part is located on the rotation path of the pawl when it engages with the ratchet. When the parking mechanism is in the parking state, the pawl engages with the limiting part and the ratchet respectively, so that the parking mechanism remains in the parking state when the coil is de-energized.

3. The parking mechanism of the electromechanical brake according to claim 2, characterized in that: The pawl includes a rod and pawl teeth disposed at one end of the rod. The ratchet has a plurality of circumferentially distributed tooth grooves. When the parking mechanism is in the parking state, the pawl teeth are located in one of the tooth grooves, and one side of the pawl teeth abuts against one side of the tooth groove. The rod abuts against the limiting part. On the pawl, the side of the pawl teeth abutting against the tooth groove and the side of the rod abutting against the limiting part are respectively located on opposite sides of the pawl.

4. The parking mechanism of the electromechanical brake according to claim 1, characterized in that: The pawl includes pawl teeth, and the ratchet has multiple circumferentially distributed tooth grooves; when the parking mechanism is in the parking state, the pawl teeth are located in one of the tooth grooves; when the parking mechanism is in the released state, the pawl teeth disengage from all of the tooth grooves.

5. The parking mechanism of the electromechanical brake according to claim 4, characterized in that: The ratchet tooth is a helical tooth, and the tooth groove is a helical tooth groove that cooperates with the helical tooth, so that when the parking mechanism is in the parking state, the motor shaft cannot rotate in the parking release direction.

6. The parking mechanism of the electromechanical brake according to claim 1, characterized in that: A limiting structure for limiting the rotation of the push rod is provided between the push rod and the valve body. The limiting structure includes a limiting member fixedly provided on the valve body. A first mating part is provided at the other end of the push rod, and a second mating part is provided on the limiting member. The first mating part and the second mating part abut against each other.

7. The parking mechanism of the electromechanical brake according to claim 1, characterized in that: One of the pawl and the connecting part is provided with a rotating shaft, and the other is provided with a sliding groove. The rotating shaft is rotatable and slidably disposed in the sliding groove along the length extension direction of the sliding groove, so that the pawl and the connecting part can be rotatably and slidably connected.

8. The parking mechanism of the electromechanical brake according to claim 1, characterized in that: The pawl and the connecting part are connected by a ball joint for universal rotation.

9. The parking mechanism of the electromechanical brake according to claim 1, characterized in that: The connection between the pawl and the housing, and the connection between the pawl and the connecting part, are located at the two ends of the pawl along its length.

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

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