Compact and noise-reducing automobile electronic parking mechanism

Abstract

The invention provides a compact and noise-reducing automobile electronic parking mechanism, and relates to the field of automobile parking parts. The compact and noise-reducing automobile electronic parking mechanism comprises a shell, an upper end cover and a motor, the motor is fixed to the bottom of the shell, the compact and noise-reducing automobile electronic parking mechanism further comprises a support fixedly installed in the shell, a sealed sound insulation cavity is formed between the upper portion of the support and the shell and the upper end cover, and the compact and noise-reducing automobile electronic parking mechanism further comprises a first-stage meshing mechanism and a second-stage meshing mechanism which are installed at the bottom of the support. Power of the motor is transmitted to the second-stage meshing mechanism through the first-stage meshing mechanism and finally output, the lower portion of the sound insulation cavity corresponds to the first-stage meshing mechanism, and the device further comprises an oil throwing assembly installed on an output shaft of the motor. According to the compact and noise-reducing automobile electronic parking mechanism, due to the fact that the support and the middle layer are arranged, the first-stage meshing mechanism and the second-stage meshing mechanism are arranged, the two ends of any one shaft are limited, the problem of jumping cannot occur during instantaneous operation, and the damage rate to a single bearing is low after long-term use.

Description

Technical Field

[0001] The present invention relates to the field of automobile parking components, in particular to a compact and noise-reducing automobile electronic parking mechanism. Background Art

[0002] New energy vehicles generally use electronic parking brakes with automatic parking functions. This function uses a motor to actuate the brake calipers, replacing manual labor, generating braking force to hold or release the vehicle. This electronic parking brake, also known as an electronic handbrake, primarily uses electronic control to achieve the vehicle's parking brake. Unlike traditional handbrakes, which require the driver to apply significant force to the parking lever mechanism using their hands or feet, this electronic parking brake only requires the driver to trigger a switch in the cab, making operation more convenient. Because electronic parking systems are easy to operate, effectively save space in the vehicle, and are highly adaptable, they also align with the development of intelligent driving in new energy vehicles. Therefore, the gradual replacement of traditional parking brakes by electronic parking systems is becoming a future trend.

[0003] An existing patent (CN110871776A) discloses an electronic parking brake actuator comprising an integrally enclosed upper and lower end cap and housing. A main retainer is positioned between the end cap and housing, connecting a motor, a gear mechanism, and a planetary gear transmission. The motor meshes with the gear mechanism, which is coaxially arranged with the planetary gear transmission. The gear mechanism and the planetary gear transmission sequentially transmit the torque required for the output brake. The overall structure is optimized, the overall volume is reduced, and the assembly is securely coupled for stable operation.

[0004] Although the above solution optimizes the installation space of the parking mechanism, it still has the following problems: First, the electronic parking mechanism is a device that runs at high speed once it is turned on. Therefore, each drive shaft is suddenly subjected to a large torsional force. Therefore, in the above solution, since each shaft system is not well restrained, shaft runout may occur after a period of use, and even bearing damage may occur. Second, the electronic parking mechanism is basically in a non-operating state during daily driving or after parking, and the operating frequency of the electronic parking mechanism is low. Once it is turned on, all transmission devices will operate together, resulting in friction noise, mechanical wear and other problems. The above solution cannot solve the problem of proper lubrication; 3. The motor gear and the intermediate gear need to rotate at high speed to generate large torque to control the subsequent transmission components. Moreover, in all electronic parking mechanisms, the initial rotating structure needs to rotate at high speed. Therefore, this part is the main source of noise. The above solution fails to overcome this problem. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a compact and noise-reducing electronic parking mechanism for an automobile, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a compact and noise-reducing automotive electronic parking mechanism, including a shell, an upper end cover and a motor, the motor is fixed at the bottom of the shell, and also includes a bracket fixedly installed in the shell, and a sealed sound insulation cavity is formed between the upper part of the bracket and the shell and the upper end cover, and also includes a primary meshing mechanism and a secondary meshing mechanism installed at the bottom of the bracket. The motor power is transmitted to the secondary meshing mechanism through the primary meshing mechanism and finally output, and the first meshing mechanism corresponds to the bottom of the sound insulation cavity, and also includes an oil-swinging assembly installed on the motor output shaft. The operation of the motor can drive the oil-swinging assembly to swing the lubricating oil between the primary meshing mechanism and the secondary meshing mechanism and reflux for continued use.

[0007] Preferably, an intermediate layer is further provided in the shell, which is sealed and fixed to the bottom of the shell. The inner bottom wall of the shell is divided into two sections, high and low, with a slope transition in the middle. A sedimentation cavity is provided at the slope position, and an oil storage cavity is formed between the bottom of the intermediate layer and the shell.

[0008] Preferably, the primary meshing mechanism includes a pinion A and a large gear A, the pinion A is fixed to the output shaft of the motor, the axle of the large gear A is respectively installed on the bracket and the middle layer, the pinion A is meshed with the large gear A, and the pinion A and the large gear A are both located at the bottom of the bracket.

[0009] Preferably, the secondary meshing mechanism includes a small gear B and a large gear B, the small gear B is coaxially connected to the large gear A, the axle of the large gear B is mounted on the bracket, and a cavity is provided at the bottom of the large gear B; It also includes a sun gear, a ring gear, a planetary gear carrier and planetary gears. The sun gear is coaxially connected to the large gear B and is arranged in the cavity. The planetary gears are installed on the planetary gear carrier and are in the cavity. The bottom end of the ring gear is embedded and fixed in the middle layer. The planetary gears are respectively engaged with the sun gear and the ring gear. The planetary gear carrier is located below the ring gear and in the oil storage cavity.

[0010] Preferably, a boss with a groove is provided at the center position of the planetary gear frame, and an oil-swinging groove is provided on the outer ring of the boss. A conical plug is fixed to the bottom of the main shaft position of the sun gear, and the conical plug is inserted into the groove of the boss. An annular groove is provided at the planetary gear shaft of the planetary gear frame, and the outer ring of the annular groove is connected to the outer ring of the planetary gear frame for oil swinging.

[0011] Preferably, an oil ring with a U-shaped cross-section is fixed to the end faces of the large gear A and the large gear B, and the oil rings of the large gear A and the large gear B are in contact with each other.

[0012] Preferably, the top surface of the large gear B is provided with a circle of distributed oil leakage holes A, and the oil leakage holes A are connected to the cavity.

[0013] Preferably, the middle layer is provided with a plurality of oil leakage holes B at positions corresponding to the bottom of the large gear B, and the oil leakage holes B are connected to the oil storage chamber.

[0014] Preferably, the oil-slinging assembly includes an oil pump installed in the oil storage chamber, which is connected to the main shaft of the motor. An oil slinger connected to the oil pump is installed at a position above the middle layer corresponding to the oil pump. The main shaft of the motor passes through the oil slinger. A turbine is fixedly installed on the outside of one end of the motor main shaft in the oil slinger. The turbine is conical in shape with the tip facing downward and matches the shape of the oil slinger. The upper end of the turbine is outside the oil slinger. The rotation of the motor main shaft prompts the oil pump to pump the bottom lubricating oil into the oil slinger, and the turbine rotates at the same time to throw out the oil in the oil slinger.

[0015] Preferably, the outer ring of the gear ring is fixed with a support ring, which is gap-matched with the inner wall of the cavity of the large gear B. The bottom of the intermediate layer is fixedly installed with a wrapping ring corresponding to the position of the planetary gear rack, and the planetary gear rack is located in the wrapping ring and gap-matched with it.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This compact and noise-reducing automotive electronic parking mechanism has a bracket and an intermediate layer, and the primary and secondary meshing mechanisms are integrated into the same axis system. Both ends of any axis are restrained, and the ring gear is embedded in the large gear B. The sun gear shaft can be restrained by the planetary gear carrier. The planetary gear carrier is not only restrained by the output shaft, but also by the ring groove on the edge. Therefore, all kinds of shafts are firmly restrained, and there will be no jumping problems during instantaneous operation. In addition, the damage rate to individual bearings is low after long-term use.

[0017] 2. This compact and noise-reducing automotive electronic parking mechanism has a high motor spindle speed due to the deceleration at various levels during operation. This feature can be used to achieve oil shedding, which can always lubricate the gear set. Finally, the oil will flow back after lubrication is completed, so the wear rate of the mechanical operation is lower and the noise generated is also smaller.

[0018] 3. In this compact and noise-reducing automotive electronic parking mechanism, since the small gear A is directly driven by the motor and has a high rotational speed, the meshing with the large gear A is prone to produce noise. The provision of a bracket can achieve a primary noise isolation effect, and the sound insulation cavity provided between the bracket and the upper end cover can further isolate the noise, and the sound insulation cavity can also be filled with a sound insulation medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a diagram showing the internal structure of the housing of the present invention; Figure 3 This is a cross-sectional view of the internal structure of the housing of the present invention; Figure 4 A half-section diagram of a part of the structure of the present invention; Figure 5 For the present invention Figure 4 A magnified view of the structure at point A; Figure 6 Schematic diagram of the structure of the bracket of the present invention; Figure 7 It is a structural diagram of the primary meshing mechanism and the secondary meshing structure of the present invention; Figure 8 It is a structural diagram of the secondary meshing mechanism of the present invention; Figure 9 This is a structural diagram of the shell and the middle layer of the present invention; Figure 10 This is a structural diagram of the planetary gear carrier of the present invention.

[0020] In the figure: 1. Housing; 2. Upper end cover; 3. Motor; 4. Bracket; 5. Sound insulation cavity; 6. Primary meshing mechanism; 601. Pinion A; 602. Large gear A; 603. Oil ring; 7. Secondary meshing mechanism; 701. Pinion B; 702. Large gear B; 703. Sun gear; 704. Ring gear; 705. Planetary gear carrier; 706. Planetary gear; 707. Boss; 708. Oil throwing groove; 709. Cone plug; 710. Ring groove; 711. Oil leakage hole A; 712. Support ring; 713. Wrapping ring; 8. Oil throwing assembly; 9. Intermediate layer; 10. Sedimentation chamber; 11. Oil storage chamber; 12. Oil leakage hole B; 13. Oil pump; 14. Oil thrower; 15. Turbine. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] like Figure 1-10 As shown, a compact and noise-reducing automotive electronic parking mechanism includes a shell 1, an upper end cover 2 and a motor 3. The motor 3 is fixed at the bottom of the shell 1. The mechanism also includes a bracket 4 fixedly installed in the shell 1. A sealed soundproof cavity 5 is formed between the upper part of the bracket 4 and the shell 1 and the upper end cover 2. The mechanism also includes a primary meshing mechanism 6 and a secondary meshing mechanism 7 installed at the bottom of the bracket 4. The power of the motor 3 is transmitted to the secondary meshing mechanism 7 through the primary meshing mechanism 6 and finally output. The lower part of the soundproof cavity 5 corresponds to the primary meshing mechanism 6. The mechanism also includes an oil-swinging assembly 8 installed on the output shaft of the motor 3. The operation of the motor 3 can drive the oil-swinging assembly 8 to swing the lubricating oil between the primary meshing mechanism 6 and the secondary meshing mechanism 7 and reflux for continued use.

[0026] The caliper-integrated electronic parking brake integrates the parking brake directly into the brake caliper, actuating the brake pads to compress the brake discs to achieve parking. Its compact structure and fast response make it widely used in modern mid-to-high-end vehicles. The electronic parking system in new energy vehicles (pure electric vehicles, plug-in hybrid PHEVs, fuel cell vehicles, etc.) has been further optimized based on traditional fuel vehicles, deeply integrated with electric drive, energy recovery, intelligent driving and other functions, becoming a key part of the vehicle's overall electrical and electronic architecture.

[0027] Current pure electric new energy vehicles do not have engine operating noise, so the entire vehicle can be quieter during operation, especially in high-end commercial vehicles. This feature has become a major advantage over traditional fuel vehicles. However, in the electronic parking mechanism, due to the need for transmission intervention, traditional fuel vehicles use electronic parking when the engine is in a running state. Therefore, the noise generated by transmission intervention is almost imperceptible, but it is more obvious in new energy vehicles.

[0028] In this solution, the housing 1 is longitudinally mounted on the caliper, and the motor 3 is used as the power source. The upper end cover 2 is mounted on the housing 1 with bolts. The upper end cover 2 can be removed during maintenance. The bracket 4 is installed in the housing 1 in an embedded installation form. The housing 1 can limit the effect of fixing the bracket 4. The motor 3 is mounted on the bottom of the housing 1 in a bolted manner, and its output shaft is inserted into the housing 1.

[0029] In an optional embodiment, an intermediate layer 9 is further provided in the shell 1 and is sealed and fixed to the bottom of the shell 1. The inner bottom wall of the shell 1 is divided into two sections, high and low, with a slope transition in the middle. A sedimentation chamber 10 is provided at the slope position, and an oil storage chamber 11 is formed between the bottom of the intermediate layer 9 and the shell 1.

[0030] In this embodiment, the connection form between the intermediate layer 9 and the shell 1 is the same as the connection form between the bracket 4 and the shell 1, and can be considered to be an integral structure with the shell 1. The slope at the bottom of the shell 1 allows the oil to flow naturally to a lower section under the action of gravity, and the sedimentation chamber 10 is at the slope, and the overall structure is sunken. Therefore, when the lubricating oil flows, impurities precipitated at the bottom will fall into the sedimentation chamber 10, avoiding being thrown up to the transmission structure again and increasing wear noise.

[0031] In an optional embodiment, the first-stage meshing mechanism 6 includes a small gear A601 and a large gear A602, the small gear A601 is fixed to the output shaft of the motor 3, and the axle of the large gear A602 is respectively installed on the bracket 4 and the middle layer 9, the small gear A601 is meshed with the large gear A602, and the small gear A601 and the large gear A602 are both located at the bottom of the bracket 4.

[0032] In this embodiment, the small gear A601 has the highest speed during operation, so it is easy to generate operating noise between it and the large gear A602. It is installed at the bottom of the bracket 4, and the noise it emits can be blocked by the bracket 4 and the shell 1. Basically, the noise generated by the small gear A601 and the large gear A602 will be transmitted to the end away from the motor 3, so the sound insulation cavity 5 can filter out this noise very well. The sound insulation cavity 5 can be in a vacuum sealed state, or it can be filled with sound insulation cotton.

[0033] In an optional embodiment, the secondary meshing mechanism 7 includes a small gear B701 and a large gear B702, the small gear B701 is coaxially connected to the large gear A602, the axle of the large gear B702 is mounted on the bracket 4, and a cavity is provided at the bottom of the large gear B702; It also includes a sun gear 703, a ring gear 704, a planetary gear carrier 705 and planetary gears 706. The sun gear 703 is coaxially connected to the large gear B702 and is arranged in a cavity. The planetary gears 706 are mounted on the planetary gear carrier 705 and are in the cavity. The bottom end of the ring gear 704 is embedded and fixed in the middle layer 9. The planetary gears 706 are respectively engaged with the sun gear 703 and the ring gear 704. The planetary gear carrier 705 is below the ring gear 704 and is located in the oil storage chamber 11.

[0034] In this embodiment, the engagement of the small gear B701 and the large gear B702 achieves further deceleration, so the noise generated by high-speed engagement is almost non-existent, but mechanical friction noise will appear during low-speed engagement. Providing a cavity at the bottom of the large gear B702 can further reduce the installation volume, and structures such as the ring gear 704 can be embedded in this cavity. During actual operation, the noise is heavily isolated, and the shaft system is unified on the bracket 4, so it is more stable during operation and less prone to shaft vibration. The embedded setting of the ring gear 704 can also further increase the stability during operation.

[0035] In an optional embodiment, a boss 707 with a groove is provided at the center position of the planetary gear carrier 705, and an oil-swinging groove 708 is provided on the outer ring of the boss 707. A conical plug 709 is fixed to the bottom of the main shaft position of the sun gear 703, and the conical plug 709 is inserted into the groove of the boss 707. An annular groove 710 is provided at the planetary gear shaft of the planetary gear carrier 705, and the outer ring of the annular groove 710 is connected to the outer ring of the planetary gear carrier 705 for oil swinging.

[0036] In this embodiment, the main shaft of the sun gear 703 can be supported by the boss 707. When the equipment is running, there is lubricating oil in the boss 707, so the lubricating oil can support the tapered plug 709. Therefore, during operation, the upper end of the main shaft of the large gear B702 is restricted by the bracket 4, and the tapered plug 709 at the lower end is positioned by the boss 707, which provides double protection during operation. The restriction of the tapered plug 709 and the boss 707 can achieve the function of circulating lubricating oil compared to the direct insertion of the prior art, thereby avoiding the long-term presence of iron chips in the lubricating oil between the shaft and the shaft hole. Otherwise, the wear rate will increase greatly after long-term use.

[0037] During operation, the lubricating oil will replace the oil inside the boss 707, and the oil in the annular groove 710 on the planetary gear carrier 705 will also be replaced, so the probability of friction will be reduced.

[0038] In an optional embodiment, an oil ring 603 with a U-shaped cross-section is fixed to the end surface of the large gear A602 and the large gear B702, and the large gear A602 is in contact with the oil ring 603 of the large gear B702.

[0039] In this embodiment, the oil ring 603 can reduce the friction after the two come into contact. Unlike the prior art, the oil ring 603 adopts a U-shaped cross-section structure, so oil will be stored inside during operation. When the two oil rings 603 come into contact and rub, the increase and overflow of oil will lubricate the surface of the oil ring 603, so no mechanical dry friction will occur.

[0040] In an optional embodiment, a circle of oil leakage holes A711 is provided on the top surface of the large gear B702, and the oil leakage holes A711 are connected to the cavity.

[0041] In this embodiment, after the oil is thrown, the oil will be thrown onto the upper surface of the large gear B702, and the thrown oil will be transferred to the cavity of the large gear B702 through the oil leakage hole A711, so that it can be lubricated by the internal sun gear 703, ring gear 704 and planetary gear 706. Therefore, even if it is installed in an embedded manner, it can be fully lubricated.

[0042] In an optional embodiment, a plurality of oil leakage holes B12 are provided at positions of the middle layer 9 corresponding to the bottom of the large gear B702 , and the oil leakage holes B12 are connected to the oil storage chamber 11 .

[0043] In this embodiment, the lubricating oil transferred from the large gear B702 can leak out from the leakage hole B after lubrication is completed.

[0044] In an optional embodiment, the oil-slinging assembly 8 includes an oil pump 13 installed in the oil storage chamber 11, which is connected to the main shaft of the motor 3. An oil slinger 14 connected to the oil pump 13 is installed above the middle layer 9 at a position corresponding to the oil pump 13. The main shaft of the motor 3 passes through the oil slinger 14, and a turbine 15 is fixedly installed on the outside of one end of the main shaft of the motor 3 in the oil slinger 14. The turbine 15 is conical in shape with the tip facing downward, and is matched with the shape of the oil slinger 14. The upper end of the turbine 15 is outside the oil slinger 14. The rotation of the main shaft of the motor 3 prompts the oil pump 13 to pump the bottom lubricating oil into the oil slinger 14, and the turbine 15 rotates at the same time to throw out the oil in the oil slinger 14.

[0045] In this embodiment, the oil pump 13, the turbine 15 and the pinion are all coaxially arranged and connected to the main shaft of the motor 3. Therefore, the speed is higher during actual operation. The oil pump 13 can adopt a spiral type or an extrusion type, which can transfer the oil precipitated at the bottom upward to the oil slinger 14. The turbine 15 rotates again to fully sling the oil inside the oil slinger 14 into the housing 1, and the effective positions basically cover the pinion A601, the large gear A602, the pinion B701 and the large gear B702.

[0046] In an optional embodiment, the outer ring of the ring gear 704 is fixed with a support ring 712, and the support ring 712 is gap-fitted with the inner wall of the cavity of the large gear B702. The bottom of the intermediate layer 9 is fixedly installed with a wrapping ring 713 corresponding to the position of the planetary gear carrier 705, and the planetary gear carrier 705 is located in the wrapping ring 713 and gap-fitted with it.

[0047] In this embodiment, the support ring 712 is used to limit the ring gear 704 to prevent the ring gear 704 from non-concentric rotation. The gap between the ring gear 704 and the large gear B702 can be used for oil leakage, and the oil can also limit the support ring 712. The structural effect of the enveloping ring 713 is similar and can be used to limit the planetary gear carrier 705. Similarly, the gap between the enveloping ring 713 and the planetary gear carrier 705 can be used for oil leakage.

[0048] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0049] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A compact and noise-reducing electronic parking mechanism for an automobile, comprising a housing (1), an upper end cover (2), and a motor (3), wherein the motor (3) is fixed to the bottom of the housing (1), and is characterized in that: The invention also includes a bracket (4) fixedly mounted in the housing (1), a sealed soundproof cavity (5) formed between the upper portion of the bracket (4), the housing (1) and the upper end cover (2), and a primary meshing mechanism (6) and a secondary meshing mechanism (7) mounted at the bottom of the bracket (4). The power of the motor (3) is transmitted to the secondary meshing mechanism (7) through the primary meshing mechanism (6) and finally outputted. The lower portion of the soundproof cavity (5) corresponds to the primary meshing mechanism (6). The invention also includes an oil-swinging assembly (8) mounted on the output shaft of the motor (3). The operation of the motor (3) can drive the oil-swinging assembly (8) to swing the lubricating oil between the primary meshing mechanism (6) and the secondary meshing mechanism (7) and reflux for continued use.

2. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 1, characterized in that: The shell (1) is further provided with an intermediate layer (9) which is sealed and fixed to the bottom of the shell (1). The inner bottom wall of the shell (1) is divided into two sections, a high section and a low section, with a slope transition in the middle. A sedimentation chamber (10) is provided at the slope position, and an oil storage chamber (11) is formed between the lower portion of the intermediate layer (9) and the shell (1).

3. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 2, characterized in that: The primary meshing mechanism (6) comprises a small gear A (601) and a large gear A (602), wherein the small gear A (601) is fixed to the output shaft of the motor (3), and the axle of the large gear A (602) is respectively mounted on the bracket (4) and the intermediate layer (9), and the small gear A (601) meshes with the large gear A (602), and both the small gear A (601) and the large gear A (602) are located in the bottom of the bracket (4).

4. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 3, characterized in that: The secondary meshing mechanism (7) includes a small gear B (701) and a large gear B (702), the small gear B (701) is coaxially connected to the large gear A (602), the axle of the large gear B (702) is mounted on the bracket (4), and a cavity is provided at the bottom of the large gear B (702); The invention also includes a sun gear (703), a ring gear (704), a planetary gear carrier (705) and planetary gears (706), wherein the sun gear (703) is coaxially connected to the large gear B (702) and is arranged in the cavity, the planetary gears (706) are mounted on the planetary gear carrier (705) and are located in the cavity, the bottom end of the ring gear (704) is embedded and fixed in the middle layer (9), the planetary gears (706) are respectively engaged with the sun gear (703) and the ring gear (704), and the planetary gear carrier (705) is located below the ring gear (704) and in the oil storage cavity (11).

5. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 4, characterized in that: A boss (707) with a groove is provided at the center of the planetary gear carrier (705), and an outer ring of the boss (707) is provided with an oil-swinging groove (708). A tapered plug (709) is fixed to the bottom of the main shaft of the sun gear (703), and the tapered plug (709) is inserted into the groove of the boss (707). An annular groove (710) is provided at the planetary gear shaft of the planetary gear carrier (705), and the outer ring of the annular groove (710) is communicated with the outer ring of the planetary gear carrier (705) for oil-swinging.

6. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 5, characterized in that: An oil ring (603) with a U-shaped cross section is fixed to the end faces of the large gear A (602) and the large gear B (702), and the oil rings (603) of the large gear A (602) and the large gear B (702) are in contact.

7. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 6, characterized in that: The top surface of the large gear B (702) is provided with a circle of distributed oil leakage holes A (711), and the oil leakage holes A (711) are communicated with the cavity.

8. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 7, characterized in that: The intermediate layer (9) is provided with a plurality of oil leakage holes B (12) at positions corresponding to the bottom of the large gear B (702), and the oil leakage holes B (12) are communicated with the oil storage chamber (11).

9. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 8, characterized in that: The oil-slinging assembly (8) includes an oil pump (13) installed in the oil storage chamber (11), which is connected to the main shaft of the motor (3). An oil slinger (14) connected to the oil pump (13) is installed at a position corresponding to the oil pump (13) above the middle layer (9). The main shaft of the motor (3) passes through the oil slinger (14). A turbine (15) is fixedly installed on the outside of one end of the main shaft of the motor (3) in the oil slinger (14). The turbine (15) is conical in shape, with the tip facing downward, and matches the shape of the oil slinger (14). The upper end of the turbine (15) is outside the oil slinger (14). The rotation of the main shaft of the motor (3) prompts the oil pump (13) to pump the bottom lubricating oil into the oil slinger (14). The turbine (15) rotates at the same time to throw out the oil in the oil slinger (14).

10. The compact and noise-reducing electronic parking mechanism for an automobile according to claim 9, characterized in that: The outer ring of the gear ring (704) is fixedly sleeved with a support ring (712), and the support ring (712) is clearance-matched with the inner wall of the cavity of the large gear B (702). The bottom of the intermediate layer (9) is fixedly mounted with an enclosing ring (713) corresponding to the position of the planetary gear carrier (705), and the planetary gear carrier (705) is located in the enclosing ring (713) and clearance-matched with the planetary gear carrier (705).

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