brake

Abstract

The utility model relates to a brake, the transmission mechanism of brake contains planetary gear system, the input gear lower surface of planetary gear system has the concave accommodation recess, and the inner tooth ring, planetary gear and sun wheel upper portion of planetary gear system are accommodated in accommodation recess.

Description

Technical Field

[0001] This utility model relates to brakes. Background Technology

[0002] The brake is a key component of automobile braking. It is installed inside the wheel hub. Considering the limited axial space inside the wheel hub, there are strict requirements on the axial length of the brake. How to further optimize the axial layout of the brake has become an important part of the brake structural design.

[0003] In the brake, the motor transmits its output torque to the lead screw through a transmission mechanism, thereby driving the piston to move axially. Specifically, the motor transmits torque to the planetary gear system through the transmission of the output gear and intermediate gear, and then the planetary gear system outputs the torque to the lead screw mechanism.

[0004] A planetary gear system typically includes an input gear, a sun gear, planet gears, an internal gear ring, and a planet carrier. The input gear is coaxially connected to the sun gear, which is externally meshed with multiple planet gears. Each planet gear is externally meshed with a fixed internal gear ring, and the planet gears are mounted on the planet carrier via planet gear shafts. The torque output from the motor is coaxially transmitted to the sun gear via the input gear. The sun gear drives the planet gears to rotate axially within the internal gear ring, thereby driving the planet carrier at its base to rotate. The planet carrier then drives an external lead screw to perform its function. As specifically disclosed in the applicant's earlier patent application CN202311231098.7, the transmission structure between the motor and the planetary gear system is described. Utility Model Content

[0005] The main purpose of this invention is to further reduce the axial length of the brake.

[0006] To achieve the above objectives, this utility model provides a brake, the transmission mechanism of which includes a planetary gear system. The lower surface of the input gear of the planetary gear system has a concave receiving groove, and the upper parts of the internal gear ring, planet gears and sun gear of the planetary gear system are received in the receiving groove.

[0007] In some embodiments of this utility model, the upper edge of the outer periphery of the internal gear ring has a chamfer.

[0008] In some embodiments of this utility model, the brake includes a housing and a motor retainer. The motor retainer is provided with a parking mechanism and the transmission mechanism. The housing covers the parking mechanism and the transmission mechanism and is connected to the motor retainer. The housing has an embedded fixing groove, and the parking mechanism is embedded and fixed in the embedded fixing groove.

[0009] In some embodiments of this utility model, a motor is fixed on a motor holder, and a ratchet and an output gear are provided on the motor. The parking mechanism includes a parking push rod mechanism and a pawl mechanism. The output gear is driven by the input gear. The parking push rod mechanism is used to drive the pawl mechanism to stop or release the ratchet. The parking push rod mechanism is embedded and fixed in the embedded fixing groove.

[0010] The brake of this invention has a compact structure and the advantage of short axial distance. Attached Figure Description

[0011] Figure 1 This is a cross-sectional schematic diagram of a planetary gear system.

[0012] Figure 2 This is a schematic diagram of the embedded fixing structure of the parking mechanism.

[0013] In the diagram: 1-Input gear, 2-Sun gear, 3-Internal gear ring, 4-Planet gear, 5-Planet gear shaft, 6-Planet carrier, 7-Cage, 71-Fixing groove, 11-Accommodation groove, 12-External gear ring, 13-Parking ratchet, 14-Parking pawl, 15-Parking push rod mechanism, 16-Circuit board mounting bracket, 161-Embedded groove. Detailed Implementation

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In case of conflict, the descriptions and definitions herein shall prevail.

[0015] This invention primarily improves the structure of the planetary gear train to obtain a brake with a shorter axial length. Other parts can utilize known brake structures, which will not be elaborated upon here. The planetary gear train structure can be found at [reference needed]. Figure 1 The planetary gear system is housed in the fixing slot 71 of the motor cage 7. The planetary gear system includes an input gear 1, a sun gear 2, planet gears 4, an internal gear ring 3, and a planet carrier 6. The input gear 1 is coaxially connected to the sun gear 2. Multiple planet gears 4 are externally meshed with the sun gear 2, and the fixed internal gear ring 3 is externally meshed with each planet gear 4. The planet gears 4 are mounted on the planet carrier 6 via planet gear shafts 5. The lower surface of the input gear 1 has a concave receiving groove 11. The internal gear ring 3, planet gears 4, and the upper part of the sun gear 2 are housed in the receiving groove 11. The upper edge of the outer periphery of the internal gear ring 3 has a chamfer 31 to avoid interference with the lower edge of the input gear 1. Therefore, the input gear 1 and the internal gear ring 3, planet gears 4, and sun gear 2 partially overlap in height, thereby reducing the overall axial length of the planetary gear system.

[0016] Due to the reduction in the overall axial length of the planetary gear train, the distance between the top of the housing covering the transmission mechanism and the parking mechanism and the motor cage is also shortened. Therefore, this invention further improves the arrangement of the housing and the parking mechanism. The parking mechanism and the aforementioned planetary gear train are mounted on the motor cage. The housing covers the parking mechanism and the planetary gear train and is connected to the motor cage. The housing has an embedded fixing groove, in which the parking mechanism is embedded and fixed. (Reference) Figure 2 A motor 17 is fixed on the motor cage 7. The motor is equipped with a ratchet 13 and an output gear (a known structure, omitted from the figure). The parking mechanism includes a parking push rod mechanism 15 and a pawl mechanism 14. The output gear is connected to the input gear in the planetary gear system. The parking push rod mechanism 15 drives the pawl mechanism 14 to stop or release the ratchet 13, thus opening or closing the parking mechanism. Because the axial distance between the top of the housing 16 and the motor cage is shortened, an embedded fixing groove 161 is provided inside the housing to embed and fix the parking push rod mechanism 15. This shortens the axial length while also satisfying the constraint and fixation requirements of the parking mechanism.

Claims

1. A brake, wherein the transmission mechanism of the brake includes a planetary gear system, characterized in that: The lower surface of the input gear of the planetary gear system has a concave receiving groove, and the upper parts of the internal gear ring, planet gears and sun gear of the planetary gear system are received in the receiving groove.

2. The brake as described in claim 1, characterized in that... The upper edge of the outer periphery of the internal gear ring has a chamfer.

3. The brake as described in claim 1, characterized in that... The device includes a housing and a motor cage. The motor cage is equipped with a parking mechanism and the aforementioned transmission mechanism. The housing covers the parking mechanism and the transmission mechanism and is connected to the motor cage. The housing has an embedded fixing groove, in which the parking mechanism is embedded and fixed.

4. The brake as described in claim 3, characterized in that... A motor is fixed on a motor cage. The motor is equipped with a ratchet and an output gear. The parking mechanism includes a parking push rod mechanism and a pawl mechanism. The output gear is driven by the input gear. The parking push rod mechanism is used to drive the pawl mechanism to stop or release the ratchet. The parking push rod mechanism is embedded and fixed in the embedded fixing groove.

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