A transmission mechanism for electronic parking brake

Abstract

The utility model relates to the field of brakes, and discloses a transmission mechanism for an electronic parking brake, comprising a screw (1) and a screw sleeve (2) matched with the screw (1), the screw sleeve (2) comprising a columnar portion (4) and an integrally formed piston portion (3), the piston portion (3) being located at the lower part of the columnar portion (4), the piston portion (3) and the columnar portion (4) being coaxially arranged; a guide groove (5) is arranged on the outer wall of the piston portion (3), the guide groove (5) is arranged axially, a cavity (6) penetrating through both ends of the axial direction is arranged in the middle of the screw sleeve (2), and the lower end of the screw sleeve (2) is sealed by a sealing cover (7). The transmission mechanism has the advantages of stable and reliable transmission, good synchronization, etc.

Description

Technical Field

[0001] The utility model relates to the field of automobile braking, in particular to a transmission mechanism for an electronic parking brake. Background Art

[0002] Chinese patent CN201410252760.1 discloses a parking brake caliper, which uses a screw sleeve and a piston structure to achieve parking brake and parking return. However, this structure needs to consider the consistency of the sleeve and the piston, and the assembly is relatively complicated. It is difficult to ensure the synchronization of the sleeve and the piston movement, resulting in insufficient response and poor accuracy. Utility Model Content

[0003] The utility model aims at the shortcomings of the prior art and provides a transmission mechanism for an electronic parking brake.

[0004] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0005] A transmission mechanism for an electronic parking brake comprises a screw and a screw sleeve matched with the screw, the screw sleeve comprises a columnar portion and an integrally formed piston portion, the piston portion is located at the lower portion of the columnar portion, and the piston portion and the columnar portion are coaxially arranged; the outer wall of the piston portion is provided with a guide groove, the guide groove is axially arranged, the middle portion of the screw sleeve is provided with a cavity penetrating through both axial ends, and the lower end of the screw sleeve is sealed by a sealing cover.

[0006] Preferably, the columnar portion and the piston portion are an integrally formed structure, the cavity is a stepped axial hole, the cavity includes a threaded hole located in the columnar portion, the threaded hole is used to cooperate with the screw, and the cavity also includes a light hole located in the piston portion, the inner diameter of the light hole is larger than the inner diameter of the threaded hole.

[0007] Preferably, an annular groove for mounting a sealing cover is formed on the lower edge of the outer side surface of the piston portion.

[0008] Preferably, a sealing groove 1 for installing a sealing ring is provided on the inner side of the light hole, an internal thread is provided on the light hole inside the inner sealing groove, a sealing groove 2 is provided on the sealing cover, and also includes a sealing ring, which is installed in sealing groove 1 and sealing groove 2.

[0009] Preferably, a tool groove for use with tools is provided in the middle of the sealing cover.

[0010] Preferably, the screw comprises a rod portion and a support bearing integrally formed on the rod portion.

[0011] Preferably, the transition between the rod portion and the piston portion is an arc transition, and the upper side edge of the side surface of the piston portion is provided with a chamfered structure.

[0012] The utility model adopts the above technical solution, and has the following significant technical effects:

[0013] The integrated return mechanism designed in the utility model reduces the use of parts and components, while ensuring the synchronization of movement and the accuracy of control. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the device.

[0015] Figure 2 yes Figure 1 Top view of the .

[0016] Figure 3 yes Figure 2 sectional view of .

[0017] The technical names of the figures in the figure are: 1-screw, 2-thread sleeve, 3-piston part, 4-columnar part, 5-guide groove, 6-cavity, 7-sealing cover, 8-threaded hole, 9-light hole, 10-annular groove, 11-sealing cover, 12-sealing ring, 13-tool groove, 14-support bearing, 15-support platform. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Example 1

[0020] A transmission mechanism for an electronic parking brake comprises a screw rod 1 and a screw sleeve 2 matched with the screw rod 1, wherein the screw rod 1 and the screw sleeve 2 are threadedly matched, the screw sleeve 2 comprises a columnar portion 4 and an integrally formed piston portion 3, and the specific forming method can refer to the manufacturing method of the stepped shaft, the screw sleeve 2 is first cast and integrally formed, and then subjected to subsequent processing to form the screw sleeve 2 structure. The piston portion 3 is located at the lower part of the columnar portion 4, and the piston portion 3 and the columnar portion 4 are coaxially arranged; the outer wall of the piston portion 3 is provided with a guide groove 5, the guide groove 5 is axially arranged, the middle part of the screw sleeve 2 is provided with a cavity 6 that runs through the two axial ends, and the lower end of the screw sleeve 2 is sealed by a sealing cover 7. During operation, a limit pin is arranged in the guide groove 5, and the limit pin is generally installed on the caliper body. The cooperation of the limit pin and the guide groove 5 can realize the circumferential limit of the screw sleeve 2 to prevent it from rotating synchronously under the drive of the screw rod 1.

[0021] In this embodiment, the columnar portion 4 and the piston portion 3 are integrally formed, the cavity 6 is a stepped shaft hole, the cavity 6 includes a threaded hole 8 located in the columnar portion 4, the threaded hole 8 is used to cooperate with the screw 1, and the cavity 6 also includes a light hole 9 located in the piston portion 3, the inner diameter of the light hole 9 is larger than the inner diameter of the threaded hole 8. The screw 1 is assembled in the cavity 6, the threaded hole 8 in the cavity 6 can not only cooperate with it for transmission, but also the light hole 9 can guide it.

[0022] In this embodiment, the lower edge of the outer side of the piston portion 3 is provided with an annular groove 10 for installing the sealing cover 11. The annular groove 10 facilitates the installation of the sealing cover 11 and ensures the reliability of the sealing of the sealing cover 11.

[0023] The inner side of the light hole 9 is provided with a sealing groove 1 for installing a sealing ring 12, and the light hole 9 on the inner side of the inner sealing groove is provided with an internal thread. The sealing cover 7 is provided with a sealing groove 2 and also includes a sealing ring 12, and the sealing ring 12 is installed in the sealing groove 1 and the sealing groove 2.

[0024] In this embodiment, a tool groove 13 for matching tools is provided in the middle of the sealing cover 7. In this embodiment, a breathing hole is designed on the sealing cover 7. The advantages of adopting a split design are easy processing, simple subsequent maintenance, and low cost.

[0025] The screw 1 comprises a rod and a support bearing 14 integrally formed on the rod. The support bearing 14 is a needle bearing, so that it can withstand the large force applied by the guide rod. A support platform 15 is provided on the rod, the lower panel of the support bearing is fixed on the support platform, and the support bearing is sleeved on the rod.

[0026] In this embodiment, the transition between the rod portion and the piston portion 3 is an arc transition, and the upper side edge of the side surface of the piston portion 3 is provided with a chamfered structure.

[0027] Example 2

[0028] The difference between this embodiment and the first embodiment is that the tool groove 13 is a hexagonal groove, which is convenient for the hexagonal wrench to perform the matching operation.

[0029] Example 3

[0030] The electronic parking brake is equipped with the transmission mechanism.

Claims

1. A transmission mechanism for an electronic parking brake, characterized in that: The invention comprises a screw (1) and a screw sleeve (2) matched with the screw (1); the screw sleeve (2) comprises a columnar portion (4) and an integrally formed piston portion (3); the piston portion (3) is located at the lower part of the columnar portion (4); the piston portion (3) and the columnar portion (4) are coaxially arranged; a guide groove (5) is arranged on the outer wall of the piston portion (3); the guide groove (5) is arranged axially; a cavity (6) penetrating through both axial ends is arranged in the middle of the screw sleeve (2); and the lower end of the screw sleeve (2) is sealed by a sealing cover (7).

2. The transmission mechanism for an electronic parking brake according to claim 1, characterized in that: The columnar portion (4) and the piston portion (3) are an integrally formed structure. The cavity (6) is a stepped axial hole. The cavity (6) includes a threaded hole (8) located in the columnar portion (4). The threaded hole (8) is used to cooperate with the screw (1). The cavity (6) also includes a light hole (9) located in the piston portion (3). The inner diameter of the light hole (9) is larger than the inner diameter of the threaded hole (8).

3. The transmission mechanism for an electronic parking brake according to claim 1, characterized in that: An annular groove (10) for mounting a sealing cover (11) is provided on the lower edge of the outer side surface of the piston portion (3).

4. The transmission mechanism for an electronic parking brake according to claim 2, characterized in that: A sealing groove 1 for installing a sealing ring (12) is arranged on the inner side of the light hole (9), and an internal thread is arranged on the light hole (9) on the inner side of the inner sealing groove. A sealing groove 2 is arranged on the sealing cover (7), and also includes a sealing ring (12). The sealing ring (12) is installed in the sealing groove 1 and the sealing groove 2.

5. The transmission mechanism for an electronic parking brake according to claim 4, characterized in that: A tool groove (13) for use with tools is provided in the middle of the sealing cover (7).

6. The transmission mechanism for an electronic parking brake according to claim 1, characterized in that: The screw rod (1) comprises a rod portion and a support bearing (14) integrally formed on the rod portion.

7. The transmission mechanism for an electronic parking brake according to claim 1, characterized in that: The transition point between the rod portion and the piston portion (3) is an arc transition, and the upper side edge of the side surface of the piston portion (3) is provided with a chamfered structure.

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