Parking driving device for double-cylinder EPB parking

Abstract

The utility model discloses a parking driving device for double-cylinder EPB parking. The parking driving device comprises a driving mechanism shell, a driving motor and a gear transmission mechanism. Wherein the driving mechanism shell comprises a shell body, a shell end cover and a motor end cover, and is used for supporting and protecting the whole parking driving device; the driving motor is installed in the driving mechanism shell and outputs torque to the parking driving device. The gear transmission mechanism is installed in the driving mechanism shell and comprises multiple stages of gear sets including a motor gear, a first-stage transmission gear, two symmetrically-arranged second-stage transmission gears and two symmetrically-arranged planetary gear sets. And the gear transmission mechanism converts and outputs the torque input by the driving motor.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive braking and parking, and relates to a parking drive device for a dual-cylinder EPB parking brake. Background Art

[0002] The electronic parking brake is applied to the vehicle braking system. With the increasing popularity of vehicle electrification, the requirement for parking force is also getting higher and higher. The original electronic parking brake system mainly has a single output shaft structure, which cannot meet the requirement for large parking force, and the mating surface between the internal gear ring and the output shaft in the housing is prone to wear, and the NVH performance is poor.

[0003] Due to the gear strength problem of the existing single output shaft structure and the strength problem of the bearing gasket inside the caliper that mates with it, the situation of being unable to withstand large torque output will occur. Therefore, when the vehicle requires a large parking force, the requirement for large parking force cannot be met, the internal gears of the parking mechanism are severely worn, and the bearing gasket inside the caliper that mates with the parking mechanism will be broken under the large parking force. Summary of the Utility Model

[0004] In order to solve the deficiencies of the existing technology, the purpose of the utility model is to provide a parking drive device for a dual-cylinder EPB parking brake. The parking drive device for a dual-cylinder EPB parking brake of the utility model has a dual output shaft, and the requirement for large parking force can be met through the dual output shaft structure. In addition, both the output shaft and the internal gear ring in the housing of the utility model are made of metal materials, which is more conducive to wear under large torque conditions, and because the used metal materials have self-lubricating effects, it is more conducive to the NVH performance and also more conducive to the noise performance of the parking mechanism; in addition, the internal gears of the parking mechanism are not easily worn, and the bearing gasket inside the caliper that mates with the parking mechanism is not easily broken under the large parking force condition.

[0005] The parking drive device for a dual-cylinder EPB parking brake in the utility model has a dual output shaft structure, and the inside of the corresponding caliper is also a dual-piston structure. Therefore, the final output torque is twice that of the ordinary single output shaft and single piston structure, so that the internal gears of the parking mechanism and the bearing gasket inside the caliper only need to bear half of the previous torque to achieve the same output torque requirement as before. In addition, since the internal gear ring structure in the housing in the existing technology is made of plastic material, it is easy to wear after the mechanism works multiple times. In the utility model, the relevant structure is changed to a metal material, and the wear almost disappears, and the output shaft and the internal gear ring in the housing adopt metal materials with self-lubrication, which is more conducive to the NVH performance of the parking mechanism.

[0006] In addition, the utility model adopts a planetary gear mechanism. Compared with the direct reduction gear mechanism, the planetary gear mechanism has the characteristics of small volume, light weight, large transmission ratio and high efficiency, which is more conducive to the performance and space layout of the parking mechanism.

[0007] The utility model provides a dual-cylinder EPB parking vehicle parking drive device, and the parking drive device includes: a drive mechanism housing, a drive motor, and a gear transmission mechanism;

[0008] Wherein, the drive mechanism housing includes a housing body, a housing end cover, and a motor end cover, which support and protect the entire parking drive device;

[0009] The drive motor is installed inside the drive mechanism housing and outputs torque to the parking drive device;

[0010] The gear transmission mechanism is installed inside the drive mechanism housing and includes a multi-stage gear set. The multi-stage gear set includes a motor gear, a first-stage transmission gear, two symmetrically arranged second-stage transmission gears, and two groups of symmetrically arranged planetary gear sets; the gear transmission mechanism converts and outputs the torque input by the drive motor.

[0011] The housing end cover and the motor end cover are respectively arranged on the upper and lower parts of the housing body and are fixedly connected to the housing body to form a cavity for arranging the drive motor and the gear transmission mechanism; the planetary gear set is arranged at the end of the gear transmission mechanism.

[0012] In a specific implementation process, a grease cavity can also be correspondingly arranged on the housing end cover for storing lubricating grease to prevent the grease from splashing out under the action of centrifugal force during the rotation of the gears; the grease cavity is arranged on the inner end face of the housing end cover in a manner of being integrally injection-molded with the housing end cover.

[0013] The drive motor is installed between the housing body and the motor end cover; a wave spring is placed in the middle of the motor end cover, and the wave spring is connected to the bottom of the drive motor to provide axial positioning for the drive motor; the output end of the drive motor is in interference fit with the housing body to provide radial positioning; two motor PINs are arranged on the drive motor and are fixedly connected to the housing PIN on the housing body to transmit signals; the motor output shaft of the drive motor passes through a preset through hole on the housing body. Two motor PINs are arranged on the drive motor and are fixedly connected to the housing PIN on the housing body to transmit signals; the housing PIN is injection-molded inside the housing, one end is connected to the customer interface, and the other end is connected to the motor PIN. The injection-molded form of the housing PIN has a simple and compact structure, which is more conducive to the overall layout of the parking mechanism.

[0014] The energization form of the motor adopts a resistance welding structure. The motor PIN and the housing PIN are welded together by resistance welding. This layout structure is simple and compact, with low cost. The housing PIN has an angle of 1° inclined towards the motor PIN, ensuring that the housing PIN and the motor PIN can fit together before welding. And there are welding protrusion features on the housing PIN to prevent the situation where the resistance welding is affected due to inaccurate positioning of the motor PIN or the housing PIN, improving the reliability of resistance welding.

[0015] For the ultrasonic welding, the motor end cover adopts triangular rib positions. The triangular rib positions are beneficial for the plastic to melt and fit during the vibration of ultrasonic welding. The housing body has a housing retaining wall, and the entire retaining wall feature is formed between the housing retaining wall and the motor end cover retaining wall feature. This feature can be used to block the slag after ultrasonic welding, and can also ensure that the molten plastic adheres to the structure at the retaining wall feature during ultrasonic welding, that is, it ensures that there is a place to store the welding slag after welding, which is beneficial for aesthetics, reduces the process of manually removing the welding slag, and is also beneficial for the sealing requirements.

[0016] The first-stage transmission gear adopts an integrally injection-molded plastic process, reducing the manufacturing cost, improving the gear accuracy, being beneficial for NVH performance. At the same time, a hollowing feature is also made, minimizing the weight while ensuring the strength and optimizing the appearance.

[0017] The second-stage transmission gear adopts an insert injection molding form. Compared with pure metal gears, while ensuring the strength requirements, this structural form is lighter and has higher gear accuracy, being beneficial for NVH performance. The insert has a 9-claw feature to prevent the insert from rotating after injection molding.

[0018] The first-stage transmission gear is arranged at both ends and fixed in the first housing axle pins of the housing body and the housing end cover respectively, and can rotate freely on the first housing axle pins;

[0019] The second-stage transmission gear is arranged at one end and fixed on the second housing axle pin of the housing end cover, and can rotate freely on the second housing axle pin.

[0020] The motor gear, the first-stage transmission gear, the second-stage transmission gear, and the planetary gear set are axially parallel to each other;

[0021] The sizes of the motor gear, the first-stage transmission gear, the second-stage transmission gear, and the planetary gear set are determined according to the actual internal space size of the housing, the spacing between the gears, the sizes and spacings of other gears, etc.

[0022] The housing body and the housing end cover are provided with a limiting structure that matches the gear transmission mechanism radially and axially to limit the gear transmission mechanism and prevent the gear transmission mechanism from shifting during movement.

[0023] The motor gear is a helical gear, which is press-fitted on the motor output shaft of the driving motor to output the motor torque;

[0024] The first-stage transmission gear includes a first-stage transmission driven gear and a first-stage transmission driving gear which are integrally manufactured. The diameter of the first-stage transmission driven gear is larger than that of the first-stage transmission driving gear; the first-stage transmission driven gear is a helical gear and meshes with the motor gear; the first-stage transmission driving gear is a spur gear;

[0025] The second-stage transmission gear includes a second-stage transmission driven gear and a second-stage transmission driving gear which are integrally manufactured. The diameter of the second-stage transmission driven gear is larger than that of the second-stage transmission driving gear; both the second-stage transmission driven gear and the second-stage transmission driving gear are spur gears. The second-stage transmission driven gear meshes with the first-stage transmission driving gear, and the second-stage transmission driving gear serves as the sun gear of the planetary gear set;

[0026] The planetary gear set includes at least three planet gears and an internal gear ring; both the planet gears and the internal gear ring are spur gears. A plurality of the planet gears are respectively mounted on a plurality of output shaft pins that are circumferentially evenly arranged on the output shaft assembly and can rotate freely on the output shaft pins; the space formed by the middle parts of the plurality of planet gears is for the second-stage transmission driving gear. The inner sides of the planet gears mesh with the second-stage transmission driving gear, and the outer sides mesh with the internal gear ring. The planetary gear set can effectively play a role in reducing speed and increasing torque. Compared with a normal speed reduction gear set, it is small in volume, light in weight, high in efficiency, and large in speed ratio, and can effectively meet the performance and space layout requirements of the parking mechanism.

[0027] The internal gear ring is injection-molded and fixed inside the housing body in an insert injection molding form, covering the outside of the planetary gear set;

[0028] A transmission output hole is formed in the middle of the output shaft assembly. The transmission output hole adopts an internal spline form to transmit the torque output by the planetary gear set backward;

[0029] The outer side surface of the output shaft assembly contacts the inner side surface of the lower part of the internal gear ring. Wear-resistant metal materials are used for the contact surface between the output shaft assembly and the inner side of the lower part of the internal gear ring, the internal gear ring itself, etc.

[0030] In a specific embodiment, a housing bushing and a signal transmission interface which are injection-molded are further arranged on the housing body; the housing bushing is used for connecting with the parking brake housing, and the signal transmission interface is used for signal transmission;

[0031] The present utility model also provides a parking drive method implemented by using the above parking drive device. The method includes the following steps:

[0032] Step 1: After the driving motor starts and rotates to generate torque, the motor gear that is press-fitted on the motor output shaft rotates to generate torque.

[0033] Step 2: The rotation of the motor gear drives the first-stage transmission driven wheel meshing with it to rotate. The first-stage transmission driving wheel then transmits the torque to the second-stage transmission driven wheel, and further transmits it to the second-stage transmission driving wheel.

[0034] Step 3: The second-stage transmission driving wheel transmits the torque to the planetary gear set. The planetary gear set drives the output shaft assembly to rotate. Finally, the output shaft assembly rotates and transmits the torque to the spline protruding from the brake caliper that fits with the transmission output hole, and finally generates a braking torque through the caliper to achieve the parking function.

[0035] The beneficial effects of the present utility model include:

[0036] The parking drive device of the present utility model can meet the requirements of large parking forces. Generally, the existing EPB parking brake can meet a maximum clamping force of 18 KN. When the vehicle weight becomes heavier and heavier, the required parking force will also become larger and larger. At this time, if the input torque continues to increase, the gears inside the parking mechanism may break, and in addition, the bearing gaskets inside the caliper may also break, resulting in a dangerous situation where braking cannot be achieved. However, the dual-cylinder parking brake driver can make the gears inside the parking mechanism and the bearing gaskets inside the caliper bear half of the torque to meet the corresponding output torque requirements. That is, when a single parking mechanism and the corresponding caliper bear a force of 18 KN, the final clamping force can reach 36 KN, so that the gears inside the parking mechanism and the bearing gaskets inside the caliper will not break due to large torque.

[0037] In addition, the present utility model changes the output shaft, the mating surface, and the internal gear ring of the housing to metal materials. When the output shaft rotates, the internal gear ring and the mating surface will not wear. Moreover, the metal materials used have self-lubricating properties, which are more beneficial to the NVH performance of the parking mechanism. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 It is a schematic external structure diagram of the parking drive device for the dual-cylinder EPB parking of the present utility model.

[0040] Figure 2This is a schematic structural diagram of the double-cylinder EPB parking drive device of the present utility model with the housing end cover removed.

[0041] Figure 3 This is a schematic internal structure diagram of the double-cylinder EPB parking drive device of the present utility model.

[0042] Figure 4 This is a schematic front structure diagram of the output shaft assembly of the double-cylinder EPB parking drive device of the present utility model.

[0043] Figure 5 This is a schematic cross-sectional diagram of the double-cylinder EPB parking drive device of the present utility model.

[0044] Figure 6 This is an exploded schematic structural diagram of the double-cylinder EPB parking drive device of the present utility model.

[0045] Figure 7 This is a schematic structural diagram of the secondary transmission gear of the double-cylinder EPB parking drive device of the present utility model.

[0046] Figure 8 This is a schematic structural diagram of the primary transmission gear of the double-cylinder EPB parking drive device of the present utility model.

[0047] Figure 9 This is a schematic structural diagram of the internal gear ring of the double-cylinder EPB parking drive device of the present utility model.

[0048] Figure 10 This is a three-dimensional schematic structural diagram of the output shaft assembly of the double-cylinder EPB parking drive device of the present utility model.

[0049] Figure 11 This is a schematic diagram of the welding protrusion feature of the double-cylinder EPB parking drive device of the present utility model.

[0050] Figure 12 This is a schematic structural diagram of the motor end cover of the double-cylinder EPB parking drive device of the present utility model.

[0051] Figure 13 This is a schematic structural diagram of the retaining wall feature of the motor end cover of the double-cylinder EPB parking drive device of the present utility model.

[0052] Figure 14 This is a schematic structural diagram of the secondary transmission driving wheel of the double-cylinder EPB parking drive device of the present utility model.

[0053] Figure 1-14Among them, 1 - housing body, 11 - housing PIN, 111 - protruding feature; 12 - retaining wall feature; 2 - housing end cover, 21 - first housing pivot pin, 22 - second housing pivot pin, 3 - motor end cover, 31 - triangular rib position; 32 - motor end cover retaining wall; 4 - drive motor, 41 - wave spring, 42 - motor PIN, 51 - motor gear, 52 - first - stage transmission gear, 521 - first - stage transmission driven wheel, 522 - first - stage transmission driving wheel, 523 - hollowing feature; 53 - second - stage transmission gear, 531 - second - stage transmission driven wheel, 532 - second - stage transmission driving wheel, 533 - insert; 5331 - nine - claw feature; 54 - planetary gear set, 541 - planetary gear, 542 - internal gear ring, 6 - output shaft assembly, 61 - output shaft pivot pin, 62 - transmission output hole. Detailed implementation manners

[0054] Combined with the following specific embodiments and drawings, the present utility model will be further described in detail. The processes, conditions, experimental methods, etc. for implementing the present utility model, except for the specifically mentioned content below, are all common knowledge and well - known common sense in the art, and the present utility model has no special restrictive content.

[0055] The present utility model provides a dual - cylinder EPB parking - use parking drive device. The parking drive device includes: a drive mechanism housing, a drive motor 4, and a gear transmission mechanism;

[0056] Among them, the drive mechanism housing includes a housing body 1, a housing end cover 2, and a motor end cover 3, which support and protect the entire parking drive device;

[0057] The drive motor 4 is installed inside the drive mechanism housing and outputs torque to the parking drive device;

[0058] The gear transmission mechanism is installed inside the drive mechanism housing and includes multiple - stage gear sets, including a motor gear 51, a first - stage transmission gear 52, two symmetrically arranged second - stage transmission gears 53, and two groups of symmetrically arranged planetary gear sets 54; the gear transmission mechanism converts and outputs the torque input by the drive motor 4.

[0059] The housing end cover 2 and the motor end cover 3 are respectively arranged on the upper and lower parts of the housing body 1 and are fixedly connected to the housing body 1 to form a cavity for arranging the drive motor 4 and the gear transmission mechanism; the planetary gear set 54 is arranged at the end of the gear transmission mechanism.

[0060] The drive motor 4 is installed between the housing body 1 and the motor end cover 3; a wave spring 41 is placed in the center of the motor end cover 3, and the wave spring 41 is connected to the bottom of the drive motor 4 to provide axial positioning for the drive motor 4; the output end of the drive motor 4 is in interference fit with the housing body 1 to provide radial positioning; two motor PINs 42 are provided on the drive motor and fixedly connected to the housing PINs 11 on the housing body 1 to transmit signals.

[0061] Two motor PINs 42 are provided on the drive motor and fixedly connected to the housing PINs 11 on the housing body 1 to transmit signals; the housing PINs 11 are injection-molded inside the housing body 1 in an injection molding form, one end is connected to the customer jack, and the other end is connected to the motor PINs 42; the housing PINs 11 have welding protrusion features 111.

[0062] The energization form of the motor 4 adopts a resistance welding structure, and the motor PINs 42 and the housing PINs 11 are welded together by resistance welding; the housing PINs 11 have an angle of 1° inclined towards the motor PINs 42, ensuring that the housing PINs 11 and the motor PINs 42 can fit together before welding.

[0063] The motor end cover 3 adopts triangular rib positions 31, which are conducive to the melting and fitting of plastics during ultrasonic welding vibration; the housing body 1 is provided with a housing retaining wall 12, and the housing retaining wall 12 and the motor end cover retaining wall 32 form the entire retaining wall feature.

[0064] The first-stage transmission gear 52 is integrally injection-molded from plastic and has a hollow feature 523 at the same time; the second-stage transmission gear 53 adopts an insert injection molding form, and the insert 533 has nine-claw features 5331.

[0065] The first-stage transmission gear 52 is arranged at both ends and fixedly installed in the first housing axle pins 21 of the housing body 1 and the housing end cover 2 respectively, and can rotate freely on the first housing axle pins 21;

[0066] The second-stage transmission gear 53 is arranged at one end and fixedly installed on the second housing axle pin 22 of the housing end cover 2, and can rotate freely on the second housing axle pin 22.

[0067] The motor gear 51, the first-stage transmission gear 52, the second-stage transmission gear 53, and the planetary gear set 54 are axially parallel to each other;

[0068] The housing body 1 and the housing end cover 2 are provided with a limiting structure that is radially and axially matched with the gear transmission mechanism to limit the gear transmission mechanism and prevent the gear transmission mechanism from shifting during movement.

[0069] The motor gear 51 is a helical gear, which is press-fitted on the motor output shaft of the drive motor 4 to output the motor torque;

[0070] The first-stage transmission gear 52 includes a first-stage transmission driven gear 521 and a first-stage transmission driving gear 522 which are integrally manufactured. The diameter of the first-stage transmission driven gear 521 is larger than that of the first-stage transmission driving gear 522; the first-stage transmission driven gear 521 is a helical gear and meshes with the motor gear 51; the first-stage transmission driving gear 522 is a spur gear;

[0071] The second-stage transmission gear 53 includes a second-stage transmission driven gear 531 and a second-stage transmission driving gear 532 which are integrally manufactured. The diameter of the second-stage transmission driven gear 531 is larger than that of the second-stage transmission driving gear 532; both the second-stage transmission driven gear 531 and the second-stage transmission driving gear 532 are spur gears. The second-stage transmission driven gear 531 meshes with the first-stage transmission driving gear 522, and the second-stage transmission driving gear 532 serves as the sun gear of the planetary gear set 54;

[0072] The planetary gear set 54 includes at least three planetary gears 541 and an internal gear ring 542; both the planetary gears 541 and the internal gear ring 542 are spur gears. A plurality of the planetary gears 541 are respectively mounted on a plurality of output shaft pins 61 circumferentially arranged on the output shaft assembly 6 and can rotate freely on the output shaft pins 61; the space formed by the middle parts of the plurality of planetary gears 541 is for the second-stage transmission driving gear 532. The inner sides of the planetary gears 541 mesh with the second-stage transmission driving gear 532, and the outer sides mesh with the internal gear ring 542.

[0073] The internal gear ring 542 is injection-molded and fixed inside the housing body 1 by insert injection molding;

[0074] A transmission output hole 62 is formed in the middle of the output shaft assembly 6. The transmission output hole 62 is in the form of an internal spline to transmit the torque output by the planetary gear set 54 backward;

[0075] The outer side of the output shaft assembly 6 contacts the inner side of the lower part of the internal gear ring 542.

[0076] Embodiment

[0077] As Figure 1 shown, the parking drive device includes a drive mechanism housing, a drive motor 4, and a gear transmission mechanism;

[0078] The driving mechanism housing includes a housing body 1, a housing end cover 2, and a motor end cover 3. The housing body 1 and the housing end cover 2 are fixed together by laser welding, and the housing body 1 and the motor end cover 3 are fixed together by ultrasonic welding.

[0079] As Figure 2 , Figure 3 shown, the gear transmission mechanism includes a motor gear 51. The motor gear 51 is made of a high-precision metal gear. High gear precision is beneficial to NVH performance, and the metal gear can ensure that it is not easily worn during large-torque transmission. The first-stage transmission gear 52 is made of a high-precision pure plastic gear. High precision is beneficial to noise performance. The second-stage transmission gear 53 is made of a plastic gear containing glass fiber material, which ensures strength while ensuring a certain precision. The motor gear 51 transmits torque to the first-stage transmission gear 52 by rotation. The first-stage transmission gear 52 then transmits the torque to the two second-stage transmission gears 53 respectively. The two second-stage transmission gears then transmit the torque to the planetary gear set 54.

[0080] As Figure 3 shown, the planetary gear set 54 includes a planetary gear 541 and an internal gear ring 542. The planetary gear 541 is installed on the output shaft assembly 6 through an output shaft pin 61 on the output shaft assembly 6. The inner hole of the planetary gear 541 has a clearance fit with the output shaft pin 61 to ensure that the planetary gear 54 can rotate freely. At the same time, the planetary gear 54 meshes with the internal gear ring 542. The internal gear ring 542 is injection-molded into the housing body 1 by insert molding, and the internal gear ring 9 does not rotate freely. The two second-stage transmission gears 53 drive the planetary gear 541 to rotate by rotation. Since the internal gear ring 542 is injection-molded in the housing body 1 and does not rotate, the planetary gear 541 will drive the output shaft assembly 6 to rotate. The output shaft assembly 6 then transmits the torque to the caliper end through the transmission output hole 62.

[0081] As Figure 4 shown, the output shaft assembly 6 adopts the form of internal splines to form a transmission output hole 62, and its strength is significantly higher than that of the external spline form, and the transmission efficiency is higher.

[0082] As Figure 5As shown, the drive motor 4 is axially positioned by a wave spring 41 and a motor end cover 3. The wave spring 12 (for axial positioning of the motor) is centered on the motor end cover 3 and connected to the bottom of the drive motor 4. After the motor end cover 3 is ultrasonically welded to the housing body 1, the axial clearance decreases, and the wave spring 41 is compressed to generate an axial force between the bottom of the drive motor 4 and the motor end cover 3. The output end of the drive motor 4 is in interference fit with the housing body 1 for radial positioning. At the same time, two motor PINs 42 of the drive motor 4 and two housing PINs 11 of the housing body 1 are fixed together by resistance welding to transmit current signals. After the drive motor 4 is powered on, it rotates. The motor gear 51 is press-fitted into the motor output shaft of the drive motor 4 through an interference fit in the inner hole. After the drive motor 4 is powered on and rotates, it drives the motor gear 51 to rotate and transmit torque, and finally transmits the torque to the caliper end through two output shafts respectively.

[0083] Figure 6 The figure is an exploded view of the structure of the dual-cylinder EPB parking brake drive device of the present utility model, mainly including a housing body 1, a housing end cover 2, a motor end cover 3, a drive motor 4, a motor gear 51, a first-stage transmission gear 52, a second-stage transmission gear 53, a planetary gear 541, an output shaft assembly, etc.

[0084] Figure 7 The figure is a structural diagram of the second-stage transmission gear 53 of the dual-cylinder EPB parking brake drive device of the present utility model, including a second-stage transmission driven wheel 531 and a second-stage transmission driving wheel 532.

[0085] Figure 8 The figure is a structural diagram of the first-stage transmission gear 52 of the dual-cylinder EPB parking brake drive device of the present utility model, including a first-stage transmission driven wheel 521 and a first-stage transmission driving wheel 522.

[0086] As Figure 10 shown, the output shaft assembly 6 is made of a metal material. As Figure 9 shown, the internal gear ring 542 also uses the same metal material. The outer side of the output shaft assembly 6 rotates on the inner side of the lower part of the internal gear ring 542. Since the internal gear ring 542 is made of a metal material, it is relatively wear-resistant, and the metal material used has self-lubricating properties, which can optimize the NVH performance during rotation.

[0087] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "radial direction", "axial direction", "upper part", "lower part", "inner part", "outer part", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0088] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0089] In the present utility model, unless otherwise clearly specified and defined, the "upper part" or "lower part" of the first feature with respect to the second feature may include the direct contact of the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being in the "upper part" of the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being in the "lower part" of the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0090] In the embodiments of the present utility model, components and settings of specific examples are described. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0091] The protection scope of the present utility model is not limited to the above embodiments. Without departing from the spirit and scope of the concept of the present utility model, the changes and advantages that can be conceived by those skilled in the art are included in the present utility model, and the appended claims are taken as the protection scope.

Claims

1. A dual-cylinder EPB parking vehicle parking drive device, characterized in that, The parking drive device includes: a drive mechanism housing, a drive motor (4), and a gear transmission mechanism; Among them, the drive mechanism housing includes a housing body (1), a housing end cover (2), and a motor end cover (3), which support and protect the entire parking drive device; The drive motor (4) is installed inside the drive mechanism housing and outputs torque to the parking drive device; The gear transmission mechanism is installed inside the drive mechanism housing and includes: a multi-stage gear set, and the multi-stage gear set includes a motor gear (51), a first-stage transmission gear (52), two symmetrically arranged second-stage transmission gears (53), and two groups of symmetrically arranged planetary gear sets (54); the gear transmission mechanism converts and outputs the torque input by the drive motor (4); Two motor PINs (42) are arranged on the drive motor and fixedly connected to the housing PIN (11) on the housing body (1) to transmit signals; the housing PIN (11) is injection-molded inside the housing body (1) in an injection-molding manner, with one end connected to the customer socket and the other end connected to the motor PIN (42); the housing PIN (11) has a welding protrusion feature (111).

2. The parking drive device according to claim 1, characterized in that The energization form of the motor (4) adopts a resistance welding structure, and the motor PIN (42) and the housing PIN (11) are welded together by resistance welding; the housing PIN (11) has an angle of 1° inclined towards the motor PIN (42), ensuring that the housing PIN (11) and the motor PIN (42) can fit together before welding.

3. The parking drive device according to claim 1, characterized in that, The motor end cover (3) adopts a triangular rib position (31), and the triangular rib position (31) is conducive to the plastic melting and fitting during ultrasonic welding vibration; the housing body (1) is provided with a housing retaining wall (12), and an entire retaining wall feature is formed between the housing retaining wall (12) and the motor end cover retaining wall (32).

4. The parking drive device according to claim 1, characterized in that The first-stage transmission gear (52) adopts an integral plastic injection molding process and has a hollow feature (523) at the same time.

5. The parking drive device according to claim 1, characterized in that, The second-stage transmission gear (53) adopts an insert injection molding form, and the insert (533) has a nine-claw feature (5331).

6. The parking drive device according to claim 1, characterized in that, The housing end cover (2) and the motor end cover (3) are respectively arranged on the upper and lower parts of the housing body (1) and fixedly connected to the housing body (1) to form a cavity for arranging the drive motor (4) and the gear transmission mechanism; the planetary gear set (54) is arranged at the end of the gear transmission mechanism; and / or The drive motor (4) is installed between the housing body (1) and the motor end cover (3); a wave spring (41) is placed in the center of the motor end cover (3), and the wave spring (41) is connected to the bottom of the drive motor (4) to provide axial positioning for the drive motor (4); the output end of the drive motor (4) is in interference fit with the housing body (1) to provide radial positioning.

7. The parking drive device according to claim 1, characterized in that, The first-stage transmission gear (52) is arranged in the first housing pin (21) fixed to the housing body (1) and the housing end cover (2) at both ends respectively, and can rotate freely on the first housing pin (21); The second-stage transmission gear (53) is arranged on the second housing pin (22) fixed to the housing end cover (2) at one end, and can rotate freely on the second housing pin (22).

8. The parking drive device according to claim 1, characterized in that, The motor gear (51), the first-stage transmission gear (52), the second-stage transmission gear (53), and the planetary gear set (54) are axially parallel to each other; The housing body (1) and the housing end cover (2) are provided with a limiting structure that matches the gear transmission mechanism radially and axially to limit the gear transmission mechanism and prevent the gear transmission mechanism from shifting during movement.

9. The parking drive device according to claim 1, characterized in that, The motor gear (51) is a helical gear and is press-fitted on the motor output shaft of the drive motor (4) to output the motor torque; The first-stage transmission gear (52) includes a first-stage transmission driven wheel (521) and a first-stage transmission driving wheel (522) integrally manufactured. The diameter of the first-stage transmission driven wheel (521) is larger than that of the first-stage transmission driving wheel (522); the first-stage transmission driven wheel (521) is a helical gear and meshes with the motor gear (51); the first-stage transmission driving wheel (522) is a spur gear; The second-stage transmission gear (53) includes a second-stage transmission driven wheel (531) and a second-stage transmission driving wheel (532) integrally manufactured. The diameter of the second-stage transmission driven wheel (531) is larger than that of the second-stage transmission driving wheel (532); both the second-stage transmission driven wheel (531) and the second-stage transmission driving wheel (532) are spur gears. The second-stage transmission driven wheel (531) meshes with the first-stage transmission driving wheel (522), and the second-stage transmission driving wheel (532) serves as the sun gear of the planetary gear set (54); The planetary gear set (54) includes at least three planet gears (541) and an internal gear ring (542); both the planet gears (541) and the internal gear ring (542) are spur gears. A plurality of the planet gears (541) are respectively mounted on a plurality of output shaft pins (61) circumferentially and evenly arranged on the output shaft assembly (6) and can rotate freely on the output shaft pins (61); the space formed by the middle parts of the plurality of planet gears (541) is for the second-stage transmission driving wheel (532). The inner sides of the planet gears (541) mesh with the second-stage transmission driving wheel (532), and the outer sides mesh with the internal gear ring (542).

10. The parking drive device according to claim 9, characterized in that, The internal gear ring (542) is injection-molded and fixed inside the housing body (1) by insert injection molding; A transmission output hole (62) is formed in the middle of the output shaft assembly (6). The transmission output hole (62) adopts an internal spline form to transmit the torque output by the planetary gear set (54) backward; The outer side surface of the output shaft assembly (6) contacts the inner side surface of the lower part of the internal gear ring (542).

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