Self-force-increasing mechanism for electronic mechanical brake of vehicle

Abstract

The utility model provides a self-force-increasing mechanism for a vehicle electronic mechanical brake. The self-force-increasing mechanism comprises a driving disc, balls, a driven disc and an elastic element. The driving disc is connected with the driving assembly, a first rolling groove is formed in the driving disc, and the depth of the first rolling groove is of a gradual change structure; the ball is matched with the first rolling groove; the balls are located between the driven disc and the driving disc. The elastic elements are connected to the driving disc and the driven disc respectively. The transmission unit has the beneficial effects that the elastic element is additionally arranged between the driving disc and the driven disc, so that the working efficiency of the transmission unit can be better improved by the formed elastic return force; the elastic element enables the driving disc and the driven disc to be combined into a whole, and the balls are located between the driving disc and the driven disc, so that the balls are not prone to disengaging from the grooves. And the elastic element is additionally arranged between the driving disc and the driven disc, so that the driving disc and the driven disc quickly return to initial positions when braking is released, and the dragging time of the brake is shortened.

Description

Technical Field

[0001] The utility model relates to vehicle braking technology, in particular to a self - augmenting force mechanism for a vehicle electro - mechanical brake. Background Art

[0002] Existing automotive electro - mechanical braking devices usually use a motor as the power source. The power of the motor is decelerated and torque - increased by a speed reducer. Subsequently, a power conversion component converts the rotational motion output by the speed reducer into a linear motion, and finally drives two brake pads to clamp the brake disc to achieve vehicle braking.

[0003] One existing type of such power conversion component, which converts the rotational driving force of the motor into a linear motion, has a very diverse range of types. One way is a rotational torque - increasing component, which has a rotational driving disc, a ball in the middle position, and a driven disc. The rotational driving disc receives the rotational driving force of the motor. During rotation, due to the different heights of the contact surfaces, the ball in the middle position is forced to form an axial motion, thereby driving the driven disc and the brake piston rod on the downstream side to perform axial motion, and thus achieving braking.

[0004] However, for the existing such rotational torque - increasing component, after the driven disc axially moves to complete braking and needs to be reset, the reset spring used is usually located on the downstream side of the driven disc, that is, after braking, the spring on the downstream side drives the driven disc to reset. However, in actual applications, there will be a problem that the reset power of the driven disc is insufficient because the spring also needs to drive components such as the piston rod on the downstream side to reset. And the driving disc and the driven disc do not form an integral body, which is also likely to cause problems such as the ball breaking away and being misaligned. Summary of the Utility Model

[0005] To solve the problems existing in the above - mentioned technology, the utility model provides a technology that assembles the driving disc and the driven disc into one body to improve the reset ability of the driven disc.

[0006] A self - augmenting force mechanism for a vehicle electro - mechanical brake provided by the utility model includes a driving disc, a ball, a driven disc, and an elastic element;

[0007] The driving disc is connected to a driving component, and the driving disc has a first rolling groove, and the depth of the first rolling groove is a gradient structure;

[0008] The ball cooperates with the first rolling groove;

[0009] The ball is located between the driven disc and the driving disc;

[0010] The elastic element is respectively connected to the driving disc and the driven disc.

[0011] Preferably, the driving disc is connected to a driving gear disc which has a circumferential external tooth portion that meshes with a gear of a driving assembly.

[0012] Preferably, the ball is located on a cage disc.

[0013] Preferably, the driving disc has a first opening, the driven disc has a second opening, and the cage disc has a middle opening; the elastic element passes through the first opening, the middle opening, and the second opening.

[0014] Preferably, the elastic element includes a first fixing rod, a second fixing rod, and a spring member. The spring member is connected to the first fixing rod and the second fixing rod respectively; the first fixing rod is located in the first opening, and the second fixing rod is located in the second opening; the spring member is arranged in the first opening, the middle opening, and the second opening, and rotates and expands and contracts between the first fixing rod (41) and the second fixing rod (42).

[0015] Preferably, the driven disc has a second rolling groove, and a part of the ball is located in the second rolling groove. The depth of the second rolling groove is a gradually changing structure.

[0016] Preferably, there are multiple groups of the first rolling grooves, and one group of balls is arranged in each group of the first rolling grooves.

[0017] The beneficial effects of the present utility model are as follows:

[0018] (1) By adding an elastic element between the driving disc and the driven disc, the formed elastic return force can better improve the working efficiency of the transmission unit;

[0019] (2) The elastic element makes the driving disc and the driven disc integrated into a whole, and the balls are located in the middle position between the two, so that the problem that the balls are not easily separated from the grooves is avoided.

[0020] (3) Adding an elastic element between the driving disc and the driven disc is beneficial to the driving disc and the driven disc quickly returning to the initial position when the braking is released, thereby reducing the braking drag time. Description of the Drawings

[0021] Figure 1 is a schematic diagram of a partial cross-sectional view of each component of a self - augmenting force mechanism of an electro - mechanical brake for a vehicle according to the present utility model;

[0022] Figure 2 is a schematic diagram of the overall structure of a self - augmenting force mechanism of an electro - mechanical brake for a vehicle according to the present utility model;

[0023] Figure 3 is a schematic diagram of the disassembled structure of a self - augmenting force mechanism of an electro - mechanical brake for a vehicle according to the present utility model;

[0024] Description of the reference numerals:

[0025] 1 - Driving disk; 11 - First rolling groove; 2 - Ball; 21 - Cage plate; 3 - Driven disk; 31 - Second rolling groove; 4 - Elastic element; 41 - First fixing rod; 42 - Second fixing rod; 43 - Spring element; 6 - Driving gear disk; 61 - Outer circumferential tooth portion; 12, First opening; 32, Second opening; 22, Middle opening. Detailed implementation manners

[0026] Embodiment 1:

[0027] A self - boosting mechanism for a vehicle electro - mechanical brake provided in this embodiment includes a driving disk 1, a ball 2, a driven disk 3 and an elastic element 4;

[0028] The driving disk 1 is connected to a driving component, and the driving disk 1 has a first rolling groove 11, and the depth of the first rolling groove 11 is a gradient structure;

[0029] The ball 2 is engaged with the first rolling groove 11;

[0030] The ball 2 is located between the driven disk 3 and the driving disk 1;

[0031] The elastic element 4 is respectively connected to the driving disk 1 and the driven disk 3.

[0032] Preferably, the driving disk 1 is connected to a driving gear disk 6, the driving gear disk 6 has an outer circumferential tooth portion 61, and the outer circumferential tooth portion 61 is meshed and connected to the gear of the driving component.

[0033] During the application process, the driving component (motor - driven) provides power to make the gear rotate. When the gear rotates, it drives the outer circumferential tooth portion 61 and the driving disk 1 to rotate. When the driving disk 1 rotates, the first rolling grooves 11 with different depths contact the ball 2, which will force the ball 2 to perform axial movement, and then push the driven disk 3 to perform axial movement. The axial movement of the driven disk 3 drives the piston rod and the brake disk on the downstream side to complete braking. The structure and working process on the downstream side of the driven disk 3 belong to the prior art and will not be elaborated here.

[0034] After braking is completed, during the reset process, the reverse movement of the driving component will drive the driving disk 1 to return to the initial position, and the elastic element 4 will drive the driven disk 3 and the ball 2 to return to the initial position by elastic force. And, in the prior art, a spring structure is also provided on the downstream side of the driven disk 3, which is also used to assist the driven disk 3 to return to the initial position.

[0035] Embodiment 2:

[0036] Preferably, the balls 2 are located on the cage disc 21. Preferably, the cage disc 21 can be suspended or arranged in a slideway, and when the active disc 1 rotates, the cage disc 21 and the balls 2 are forced to move axially; when the active disc 1 rotates, the balls 2 and the driven disc 3 rotate along with it, but the change in the depth of the first rolling groove 11 forces the balls 2 and the downstream components to move axially.

[0037] The driving disk 1 has a first opening 12 , the driven disk 3 has a second opening 32 , and the cage disk 21 has a middle opening 22 .

[0038] The elastic element 4 includes a first fixing rod 41, a second fixing rod 42 and a spring member 43. The first fixing rod 41 is located in the first opening 12, and the second fixing rod 42 is located in the second opening 32. The two ends of the spring member 43 are respectively connected to the first fixing rod 41 and the second fixing rod 42, and are arranged in the first opening 12, the middle opening 22 and the second opening 32, and rotate and retract between the first fixing rod 41 and the second fixing rod 42.

[0039] Preferably, the driven plate 3 has a second rolling groove 31 , a portion of the ball 2 is located in the second rolling groove 31 , and the depth of the second rolling groove 31 is a gradual structure.

[0040] Preferably, there are multiple groups of the first rolling grooves 11 , and a group of the balls 2 is arranged in each group of the first rolling grooves 11 .

[0041] The beneficial effects of the utility model are:

[0042] (1) By adding an elastic element between the driving disk and the driven disk, the elastic rebound force formed can better increase the working efficiency of the transmission unit;

[0043] (2) The elastic element combines the active disk and the driven disk into a whole, and the ball is located in the middle of the two, making it difficult for the ball to fall out of the groove.

[0044] (3) Adding an elastic element between the driving disc and the driven disc helps the driving disc and the driven disc to quickly return to their initial positions when the brake is released, thereby reducing the brake drag time.

[0045] The utility model adds an elastic element between the two disks. The original state of the elastic element is a tensioned state. When the active disk and the driven disk rotate relatively, the active disk rotates in place, but because the first groove with a gradual depth contacts the ball, the ball and the driven disk move axially. The elastic element can generate a force to form a trend that makes the driven disk approach the active disk. The restoring force generated by the elastic element acts directly on the driven disk, so that the driven disk can recover to the initial position faster and more stably.

[0046] Furthermore, the elastic element integrates the driving disc and the driven disc into a whole, and the ball is located in the middle position between the two, preventing the problem that the ball is not easily detached from the groove.

[0047] Preferably, a spring can also be provided on the downstream side of the driven disc, i.e., at the position connecting the piston rod and the brake disc. There is such a technology in the prior art, that is, a return spring is provided on the downstream side to assist the driven disc in returning. The added elastic element in this application can cooperate with the return spring in the prior art to achieve the purpose of applying force doubly and improve the return rate.

Claims

1. A self-enhancing mechanism for an electronic mechanical brake of a vehicle, characterized in that: include: An active disk (1) is connected to the driving assembly, the active disk (1) having a first rolling groove (11), the depth of the first rolling groove (11) being a gradual structure; A rolling ball (2) matched with the first rolling groove (11); A driven disc (3), wherein the ball (2) is located between the driven disc (3) and the driving disc (1); The elastic element (4) is respectively connected to the active disk (1) and the driven disk (3).

2. The self-enhancing mechanism for the electronic mechanical brake of a vehicle according to claim 1, characterized in that: The active disc (1) is connected to a driving toothed disc (6), and the driving toothed disc (6) has a circumferential outer tooth portion (61), and the circumferential outer tooth portion (61) meshes with a gear connected to a driving assembly (5).

3. The self-enhancing mechanism for a vehicle electronic mechanical brake according to claim 1, characterized in that: The balls (2) are located on a retaining frame plate (21).

4. The self-enhancing mechanism for the vehicle electronic mechanical brake according to claim 3, characterized in that: The active disk (1) has a first opening (12), the driven disk (3) has a second opening (32), the retaining frame disk (21) has a middle opening (22), and the elastic element (4) passes through the first opening (12), the middle opening (22) and the second opening (32).

5. The self-energizing mechanism for a vehicle electronic mechanical brake according to claim 4, characterized in that: The elastic element (4) comprises a first fixing rod (41), a second fixing rod (42) and a spring member (43); the spring member (43) is respectively connected to the first fixing rod (41) and the second fixing rod (42); the first fixing rod (41) is located in the first opening (12), and the second fixing rod (42) is located in the second opening (32); the spring member (43) is arranged in the first opening (12), the middle opening (22) and the second opening (32), and is rotated and telescoped between the first fixing rod (41) and the second fixing rod (42).

6. The self-energizing mechanism for a vehicle electronic mechanical brake according to claim 1, characterized in that: The driven disc (3) has a second rolling groove (31), a portion of the ball (2) is located in the second rolling groove (31), and the depth of the second rolling groove (31) is a gradual structure.

7. The self-amplifying mechanism for a vehicle electronic mechanical brake according to claim 1, characterized in that: The first rolling grooves (11) are multiple groups, and a group of the balls (2) is arranged in each group of the first rolling grooves (11).

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