Electronic parking brake
By setting a female and male connection structure on the planetary gear disk and combining it with the sealing design, the torque and sealing problems in the brake are solved, realizing a high-torque and low-cost electronic parking brake design, and improving the dustproof and waterproof effect.
Patent Information
- Application Number
- CN202423315334.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The connection method of the planetary gear disk in the existing brake limits the output torque, and the gap at the connection between the housing and the bracket results in poor dust and water resistance, making it impossible to produce using low-cost powder metallurgy process.
A female head structure is used to create holes in the planetary gear disk, which is then connected to the lead screw via a male head structure. Combined with a sealing element design, the torque bearing capacity and sealing effect are improved. The planetary gear disk is manufactured using powder metallurgy technology, and the multi-layer structure of the sealing element enhances its dustproof and waterproof performance.
It improves the torque capacity of the planetary gear disk, reduces production costs, and significantly enhances the dustproof and waterproof performance of the brake.
Smart Images
Figure CN223662426U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an electronic parking brake. Background Technology
[0002] As competition in the automotive industry intensifies, reducing the production cost of auto parts is a crucial issue that auto parts manufacturers need to address. However, some parts cannot be manufactured using low-cost processes due to structural limitations. For example, the connection between the planetary gear disc and the lead screw in a brake, if using a female head structure on the lead screw and a male head structure on the planetary gear disc, prevents the planetary gear disc from being manufactured using powder metallurgy. This is because planetary gear discs made of powder metallurgy have limited load-bearing capacity, and excessive torque will cause damage. Therefore, this structure limits the output torque. Furthermore, gaps exist at the connection between the housing and the bracket, allowing dust or water to enter the brake housing. As brakes become increasingly intelligent, more electronic components are housed within the brake housing; therefore, the requirements for dust and water resistance are also increasing. Utility Model Content
[0003] One of the purposes of this invention is to overcome the shortcomings of the prior art and provide an electronic parking brake that improves output force.
[0004] To achieve the above objectives, this utility model employs the following technical solution:
[0005] An electronic parking brake, characterized in that it includes:
[0006] Electric motor;
[0007] A transmission device, comprising a planetary gear disk for mounting planetary gears, the planetary gear disk having a female head structure; the transmission device is connected to the motor;
[0008] An adjusting assembly includes a lead screw and a pusher. The lead screw has a male end structure and is rotatably mounted. The lead screw is threadedly engaged with the pusher. The lead screw is connected to the planetary gear disk via a male end structure and a female end structure.
[0009] Friction plate;
[0010] The motor drives the lead screw to rotate through a transmission device, and when the lead screw rotates, it drives the friction plate to move linearly through the pusher.
[0011] According to one embodiment of the present invention, the female head structure is a hole provided on the planetary gear disk.
[0012] According to one embodiment of the present invention, the hole is a through hole.
[0013] According to one embodiment of the present invention, the male connector structure is adapted to the hole; the male connector structure is inserted into the hole to connect the lead screw to the planetary gear disk.
[0014] According to one embodiment of the present invention, the hole is provided with a plurality of keyways distributed along the circumferential direction; the male head structure includes a plurality of splines; the splines are inserted into the keyways.
[0015] According to one embodiment of the present invention, it further includes a housing and a bracket, wherein the motor, transmission structure and adjustment assembly are disposed within the housing, and the pushing member is disposed extending outside the housing; the friction plate is disposed on the bracket; and the housing and the bracket are connected by a connector.
[0016] According to one embodiment of the present invention, the housing is provided with a first hole; the bracket is provided with a sleeve, the sleeve is provided with a second hole, a guide pin is provided in the second hole, and the guide pin is movably disposed in the second hole; the connector passes through the first hole and is connected to the guide pin; it also includes a sealing member, the sealing member including a first end, a telescopic part and a second end connected in sequence; the telescopic part is telescopically disposed; the first end is inserted into the first hole and the second end is inserted into the second hole.
[0017] According to one embodiment of the present invention, the sealing element further includes an outer sleeve, one end of which is connected to the telescopic part, and the other end is freely disposed; the outer sleeve is disposed around the second end and has a gap with the second end; the sleeve portion is inserted into the gap.
[0018] According to one embodiment of the present invention, the inner wall of the outer sleeve is provided with a protrusion extending toward the second end; the outer wall of the sleeve is provided with a groove, and the protrusion is embedded in the groove.
[0019] The electronic parking brake of this invention features a female head structure mounted on the planetary gear disk and a male head structure mounted on the lead screw. Because the female head structure has a hole in the planetary gear disk, unlike the male head structure which requires a protruding rod on the planetary gear disk, the planetary gear disk can withstand greater torque. Therefore, within the torque limit, the planetary gear disk can be manufactured using powder metallurgy, reducing production costs. The seal in this invention, with its first end and outer sleeve jointly enclosing the end of the sleeve, provides a better seal and improved dust and water resistance. The protrusion on the outer sleeve mates with the groove in the sleeve, making the connection between the seal and the sleeve more secure and further enhancing the sealing effect. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the electronic parking brake structure in this utility model.
[0021] Figure 2 This is a top view schematic diagram of the electronic parking brake structure in this utility model.
[0022] Figure 3 for Figure 2 Schematic diagram of the electronic parking brake AA in the middle.
[0023] Figure 4 This is a schematic diagram of the sealing element structure in this utility model.
[0024] Figure 5 This is a cross-sectional view of the sealing element in this utility model.
[0025] Figure 6 This is a schematic diagram of the electronic parking brake component of this utility model.
[0026] Figure 7 This is a schematic diagram showing the relationship between the planetary gear disk and the adjustment assembly.
[0027] Figure 8 for Figure 7 A structural breakdown diagram. Detailed Implementation
[0028] like Figures 1 to 8 As shown, the electronic parking brake 100 includes a housing 110 and a bracket 120. The housing 110 houses a motor 130, a transmission device 140, and an adjustment assembly 150. The bracket 120 mounts a friction pad 160. The housing 110 is connected to the bracket 120. The motor 110 drives the adjustment assembly 150 via the transmission device 140. The adjustment assembly 150 extends beyond the housing 110 to move the friction pad 160, thereby achieving braking or parking functions.
[0029] A first hole 111 is provided on the housing 110. The first hole 111 penetrates the housing 110. A sleeve 121 is provided on the bracket 120. A second hole 122 is provided on the sleeve 121. A guide pin 123 is provided in the second hole 122, and the guide pin 123 is movably disposed in the second hole 122. A connector 124 passes through the first hole 111 and is connected to the guide pin 123. The connector 124 and the guide pin 123 can be connected by threads. A sealing member 170 is provided between the housing 110 and the sleeve 121. The sealing member 170 includes a first end 171, a telescopic part 172, and a second end 173 connected in sequence. The telescopic part 172 is telescopically disposed. The first end 171 is inserted into the first hole 111, and the second end 173 is inserted into the second hole 122. The seal 170 further includes an outer sleeve 174, one end of which is connected to the telescopic portion 172, and the other end is freely disposed. The outer sleeve 174 is disposed around the second end portion 173 and has a gap 175 with the second end portion 173. The sleeve 121 is partially inserted into the gap 175. In the example shown, the inner wall of the outer sleeve 174 is provided with a protrusion 176 extending toward the second end portion 173; the outer wall of the sleeve 121 is provided with a groove 125, and the protrusion 176 is embedded in the groove 125.
[0030] The transmission device 140 comprises multiple meshing gears, including a planetary gear 141. Transmission devices including planetary gears 141 are existing technology and will not be described in detail here. The transmission device 140 includes a planetary gear disk 142 for mounting the planetary gears 141, and the planetary gear disk 142 is provided with a female head structure 143. The female head structure 143 is a hole. In the preferred example shown, the female head structure 143 is a through hole. Multiple keyways 144 are provided within the female head structure 143. The multiple keyways 144 are distributed along the circumferential direction.
[0031] The adjusting assembly 150 is used to convert the rotary motion transmitted by the transmission device 140 into linear motion. The adjusting assembly 150 includes a lead screw 151 and a pusher (not shown in the figure), the lead screw 151 being rotatably mounted. The lead screw 151 is threadedly engaged with the pusher. The pusher can be a nut, or a combination of a nut and a piston. The nut engages with the lead screw 151. The nut and piston cannot rotate but can only move linearly. Therefore, when the motor 130 drives the lead screw 151 to rotate via the transmission device 140, the nut and piston will move linearly. The lead screw 151 is provided with a male end structure 152. The male end structure 152 is adapted to a female end structure 143. The male end structure 152 can be inserted into the female end structure 143. In the structure shown, the male end structure 152 is provided with multiple splines 153. The splines 153 are adapted to a keyway 144. The lead screw 151 and the planetary gear disk 142 are connected via the male and female end structures.
[0032] The electronic parking brake of this invention features a female head structure mounted on the planetary gear disk and a male head structure mounted on the lead screw. Because the female head structure has a hole in the planetary gear disk, unlike the male head structure which requires a protruding rod on the planetary gear disk, the planetary gear disk can withstand greater torque. Therefore, within the torque limit, the planetary gear disk can be manufactured using powder metallurgy, reducing production costs. The seal in this invention, with its first end and outer sleeve jointly enclosing the end of the sleeve, provides a better seal and improved dust and water resistance. The protrusion on the outer sleeve mates with the groove in the sleeve, making the connection between the seal and the sleeve more secure and further enhancing the sealing effect.
[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.
Claims
1. An electronic parking brake, characterized in that, include: Electric motor; A transmission device, comprising a planetary gear disk for mounting planetary gears, the planetary gear disk having a female head structure; the transmission device is connected to the motor; An adjusting assembly includes a lead screw and a pusher. The lead screw has a male end structure and is rotatably mounted. The lead screw is threadedly engaged with the pusher. The lead screw is connected to the planetary gear disk via a male end structure and a female end structure. Friction plate; The motor drives the lead screw to rotate through a transmission device, and when the lead screw rotates, it drives the friction plate to move linearly through the pusher.
2. The electronic parking brake according to claim 1, characterized in that, The female head structure is a hole provided on the planetary gear disk.
3. The electronic parking brake according to claim 2, characterized in that, The hole is a through hole.
4. The electronic parking brake according to claim 2, characterized in that, The male connector is adapted to fit the hole; the male connector is inserted into the hole to connect the lead screw to the planetary gear disk.
5. The electronic parking brake according to claim 4, characterized in that, The hole is provided with multiple keyways distributed along the circumferential direction; the male end structure includes multiple splines; the splines are inserted into the keyways.
6. The electronic parking brake according to claim 1, characterized in that, It also includes a housing and a bracket, the motor, transmission structure and adjustment components are disposed inside the housing, the pusher is disposed outside the housing; the friction plate is disposed on the bracket; the housing and the bracket are connected by a connector.
7. The electronic parking brake according to claim 6, characterized in that, The housing has a first hole; the bracket has a sleeve with a second hole, and a guide pin is provided in the second hole, which is movably disposed within the second hole; the connector passes through the first hole and is connected to the guide pin; the housing also includes a sealing element, which includes a first end, a telescopic part, and a second end connected in sequence; the telescopic part is telescopically disposed; the first end is inserted into the first hole, and the second end is inserted into the second hole.
8. The electronic parking brake according to claim 7, characterized in that, The seal also includes an outer sleeve, one end of which is connected to the telescopic part, and the other end is freely disposed; the outer sleeve is disposed around the second end and has a gap with the second end; the sleeve portion is inserted into the gap.
9. The electronic parking brake according to claim 8, characterized in that, The inner wall of the outer sleeve is provided with a protrusion extending toward the second end; the outer wall of the sleeve is provided with a groove, and the protrusion is embedded in the groove.