Braking thrust disc assembly capable of preventing balls from falling off

Abstract

The utility model relates to a vehicle brake technology, in particular to a brake thrust disc assembly with anti-falling balls, which comprises a driving disc, a driven disc and the balls, the driving disc is provided with a driving disc groove, the driving disc groove forms a gradual change structure in the axial direction, and the driving disc is used for being connected with a vehicle brake driving piece so as to enable the driving disc to move in the circumferential direction; the driven disc is provided with a driven disc groove, the driven disc groove forms a gradual change structure in the axial direction, and the driven disc is used for vehicle braking and can move in the axial direction; the balls are arranged between the driving disc and the driven disc, and parts of the balls are embedded into the driving disc grooves and the driven disc grooves respectively. The device has the beneficial effect that the problem of ball disengagement is solved. The end face of the driving disc is not of a plane structure, a gradient is arranged on the end face of the driving disc, the gradient is the lowest at the starting position, and in the manufacturing process, the end face is designed to be of a gradually-changing height.

Description

Technical Field

[0001] The utility model relates to vehicle braking technology, in particular to a thrust disc technology for vehicle brakes. Background Art

[0002] A vehicle brake is a braking device for an automobile. Almost all brakes used in automobiles are friction brakes, which can be divided into two categories: drum brakes and disc brakes. The rotating element in the friction pair of a drum brake is a brake drum, and its working surface is a cylindrical surface; the rotating element of a disc brake is a rotating brake disc, with its end face as the working surface. A vehicle brake refers to a component that generates a force (braking force) to impede the movement or tendency of movement of the vehicle, and also includes devices in the auxiliary braking system.

[0003] The replacement of electro-hydraulic braking (EHB) with electro-mechanical braking (EMB) has become the mainstream solution for the next stage of braking systems. However, there are currently a wide variety of existing EMB configuration solutions with different structural functions. The EMB actuator includes five major modules: a service braking mechanism, a parking braking mechanism, a brake clearance compensation mechanism, a quick retraction mechanism, and a sensor. As the basic module of the actuator, the service braking mechanism mainly consists of a motor, a speed reduction and force amplification mechanism, a motion conversion mechanism, and a pressing member. According to the different speed reduction and force amplification mechanisms and motion conversion mechanisms, the current main EMBs are divided into four basic configurations: ball screw, wedge self-energizing, ball ramp, and cam. Among them, ball screw and ball ramp are more commonly used in commercial vehicle electro-mechanical braking.

[0004] The ball ramp configuration uses balls and inclined guiding ramps to achieve the rotation-translation motion conversion to push the piston to move and achieve braking clamping. In order to make this rotation-translation motion conversion present a non-linear relationship, the design of the guiding ramp is variable, and the ramp becomes shallower from deep. However, due to the limitation of the circumferential track path, in order to achieve the non-linear change, the ramp part is very shallow in some positions, making it easy for the balls to escape from this mechanism and difficult to ensure the safety and reliability of this mechanism. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a technology for preventing the balls of the thrust disc from escaping during movement.

[0006] To achieve the above purpose, the utility model provides a braking thrust disc assembly with ball anti-detachment, which includes an active disc, a driven disc, and balls:

[0007] The active disc has an active disc groove, and the active disc groove forms a gradient structure in the axial direction. The active disc is used to connect the driving part of vehicle braking so that the active disc can move circumferentially;

[0008] The driven disc has a driven disc groove. The driven disc is used for vehicle braking and can move axially;

[0009] The ball bearings are arranged between the driving disk and the driven disk, and a part of the ball bearings is respectively embedded in the driving disk groove and the driven disk groove; the driving disk and the driven disk are in a mutually biting state.

[0010] Preferably, the active disk has an active disk end surface, and a partial area on the active disk end surface forms the active disk groove;

[0011] The driven disk has a driven disk end surface, and a partial area on the driven disk end surface forms the driven disk groove.

[0012] Preferably, the active disc grooves and the driven disc grooves are each in three groups, and each group of active disc grooves and driven disc grooves cooperate to clamp a ball.

[0013] Preferably, the driving plate groove and the driven plate groove are formed by extending from a lower starting point to a higher end point.

[0014] Preferably, the movement of the ball in the active disk and the driven disk has a starting position and an end position. In the state of the starting position, the ball is located at the starting position of the groove of the active disk, and the interval between the active disk and the driven disk is the smallest.

[0015] In the end position state, the ball is located at the end position of the active disc groove, and at this time, the interval distance between the active disc and the driven disc is the largest.

[0016] Preferably, the driven disk is capable of circumferential movement.

[0017] Preferably, a toothed structure is provided on the circumferential outer wall of the active disk, and the toothed structure is a ratchet or the like.

[0018] The driven disc is threadedly connected to an axially movable piston rod through a threaded rod.

[0019] The utility model designs a ball groove, which has the beneficial effect of solving the problem of ball slipping out. The end surface of the active disk is not a planar structure, and a groove is arranged on the end surface. The groove is at the lowest starting position. During the manufacturing process, the end surface is designed to have a gradually changing height, and the change of the height matches the depth of the ball track. A part of the ball is located in the groove to prevent the ball from slipping out.

[0020] The height of the groove along the axial direction is gradual. If it is unfolded on a plane, it is an inclined surface. Therefore, the force exerted by the active disk on the driven disk through the ball is divided into axial and circumferential tangential forces, causing the driven disk to rotate and move axially.

[0021] Preferably, this arrangement makes the opening width of the grooves uniform, thereby avoiding the problem of inconsistent track opening width in the solution where the end surface is a planar structure. Brief Description of the Drawings

[0022] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 is a schematic diagram of the disassembled state of an existing ball ramp configuration;

[0024] Figure 2 is a schematic diagram of the disassembled state of a braking thrust plate assembly with ball anti - detachment of the present utility model;

[0025] Figure 3 is a schematic diagram of the mating state of the starting position of the ball movement of a braking thrust plate assembly with ball anti - detachment of the present utility model;

[0026] Figure 4 is a schematic diagram of the mating state of the end position of the ball movement of a braking thrust plate assembly with ball anti - detachment of the present utility model;

[0027] Figure 5 is a schematic diagram of the driven disk of a braking thrust plate assembly with ball anti - detachment of the present utility model;

[0028] Figure 6 is a schematic diagram of a preferred embodiment of a braking thrust plate assembly with ball anti - detachment of the present utility model having ratchet teeth.

[0029] Figure 7 is a schematic diagram of a preferred embodiment of a braking thrust plate assembly with ball anti - detachment of the present utility model having a threaded rod and a piston rod.

[0030] Description of the Reference Numerals in the Drawings:

[0031] 1 - driving disk; 2 - driven disk; 3 - ball; 4 - driving disk end face; 5 - driving disk groove; 6 - driven disk end face; 7 - driven disk groove;

[0032] 11 - ratchet teeth; 12 - first rolling groove; 21 - circular main body disk; 22 - piston rod; 23 - threaded rod; 24 - brake disk; 31 - rolling element; 32 - rolling element support. Detailed Embodiments

[0033] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Many specific details are set forth in the following description in order to fully understand the present utility model, but the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0034] Introduction to the Prior Art:

[0035] As shown Figure 1 in the figure, there is an existing ball ramp configuration, which mainly includes a driving disc 1, rolling elements 31, a rolling element support 32 and a driven disc 2. One end face of the driving disc 1 has a first rolling groove 12. The driven disc 2 has a circular main body disc 21, and the axial movement of the circular main body disc 21 is used for braking. The rolling elements 31 cooperate with the first rolling groove 12 of the driving disc 1, and the first rolling groove 12 has different depths.

[0036] When the driving disc 1 rotates, the rolling elements 31 contact the first rolling groove 12 at different depth positions, forcing the rolling elements 31 to move axially, and then driving the driven disc 2 (the driven disc 2 can be connected to a piston rod) to move axially, and finally the brake disc brakes the vehicle by friction.

[0037] In the prior art, in order to prevent the balls (rolling elements 31) from falling out, the method adopted is to use the rolling element support 32, but this increases the cost and the assembly difficulty. When the support is removed and in the form of a ball disc, the balls are likely to fall out. To prevent the balls from falling out, it is only possible to reduce the ball diameter (increase the slope depth) and match a suitable track radius, thereby reducing the transmission efficiency.

[0038] This technical problem is solved by the following Embodiment 1.

[0039] Embodiment 1

[0040] As shown Figures 2 to 5 in the figure, a ball anti - detachment brake thrust disc assembly of this embodiment includes a driving disc 1, a driven disc 2 and balls 3;

[0041] The driving disc 1 has a driving disc groove 5, and the driving disc groove 5 forms a gradient structure in the axial direction. The driving disc 1 is used to connect a driving member (such as a motor and a gear train) for vehicle braking so that the driving disc 1 can move circumferentially; preferably, as shown Figure 6 in the figure, the driving disc 1 is provided with ratchet teeth 11, and it is convenient to engage with a gear through the ratchet teeth 11 to receive the power provided by the motor; preferably, the ratchet teeth 11 are arranged on the circumferential outer wall of the driving disc 1; in addition, the driving disc 1 can also receive driving in other existing ways.

[0042] The driven disc 2 has a driven disc groove 7, and the driven disc groove 7 forms a gradient structure in the axial direction. The driven disc 2 is used for vehicle braking, and the driven disc 2 can move axially and / or rotationally;

[0043] The balls 3 are arranged between the driving disc 1 and the driven disc 2, and a part of the balls 3 are respectively embedded in the driving disc groove 5 and the driven disc groove 7.

[0044] In actual applications, the driving part of the vehicle, such as a motor, drives the active disc 1 to rotate, and the motor drive can be direct drive or indirect drive. When the driven disc 2 can rotate freely, the active disc 1 will rotate together with the driven disc 2 through the ball 3; and when the driven disc 2 and the downstream component are braked and cannot rotate, when the active disc 1 rotates, the groove 5 of the active disc contacts the ball 3 at different positions. Due to the different heights of the groove 5 in the axial direction, the position of the ball 3 is forced to change in the axial direction, thereby driving the driven disc 2 to move axially, and then driving the downstream component to brake.

[0045] During this process, the balls 3 are always embedded in the active disc groove 5 and the driven disc groove 7 and will not be separated, thus ensuring the movement stability; and no ball bracket is provided, thus saving costs.

[0046] The utility model designs a ball ramp which solves the problem of balls falling out.

[0047] The end face of the active disk is not a planar structure, but is provided with a slope, which is lowest at the starting position. During the manufacturing process, the end face is designed to have a gradual height, so that the ball is always located inside the groove of the groove, and is supported from the side during the rolling process to prevent the ball from falling out.

[0048] Specifically, in Figure 4 In the state shown, due to the presence of the ramp, a good blocking effect is formed on both sides, which limits the ball in the middle position and effectively prevents it from slipping out; that is, the active disk 1 and the driven disk 2 are in a mutual bite state, reaching a state similar to a ratchet locking state, so that the ball 3 is clamped in the middle position to prevent it from slipping out.

[0049] To further explain, the height of the groove along the axial direction is gradual, and if unfolded on a plane, it is an inclined surface, so the force exerted by the active disk on the driven disk through the ball is divided into axial and circumferential tangential forces, which can make the driven disk rotate and move axially.

[0050] Preferably, this arrangement makes the opening width of the grooves uniform, thereby avoiding the problem of inconsistent track opening width in the solution where the end surface is a planar structure.

[0051] Example 2

[0052] In the brake thrust disc assembly with ball anti-slip in this embodiment, the active disc 1 has an active disc end surface 4, and a part of the active disc end surface 4 forms the active disc groove 5;

[0053] The driven disk 2 has a driven disk end surface 6 , and a partial area of the driven disk end surface 6 forms the driven disk groove 7 .

[0054] Preferably, there are three groups of the driving disk grooves 5 and the driven disk grooves 7 respectively, and each group of the cooperation between the driving disk grooves 5 and the driven disk grooves 7 clamps a ball 3.

[0055] Preferably, the driving disk grooves 5 and the driven disk grooves 7 extend from a lower starting point to a higher ending point.

[0056] Preferably, the movement of the ball 3 between the driving disk 1 and the driven disk 2 has a starting position and an ending position. In the state of the starting position, the ball 3 is located at the starting point position of the driving disk groove 5, and at this time, the interval distance between the driving disk 1 and the driven disk 2 is the smallest; that is, in the Figure 3 shown state.

[0057] In the state of the ending position, the ball 3 is located at the ending point position of the driving disk groove 5, and at this time, the interval distance between the driving disk 1 and the driven disk 2 is the largest. That is, in the Figure 4 shown state.

[0058] Preferably, when the device provided by the present invention is applied to an EMB (Electronic Mechanical Brake) system, as Figure 7 shown, the driven disk 2 is threadedly connected to the axially movable piston rod 22 through a threaded rod 23, that is, the piston rod 22 can only move axially (the circumferential movement is restricted, for example, it can only move axially through the cooperation of a sliding block and a slideway), a brake disk 24 is arranged on the downstream side of the piston rod 22, and the braking of the brake disk 24 on the vehicle belongs to the prior art and will not be elaborated here.

[0059] In the initial stage, there is a gap between the piston rod 22 and the brake disk 24. The driving disk 1 and the ball 3 drive the driven disk 2 and the threaded rod 23 to rotate together. The piston rod 22 moves horizontally through the threaded fit. Since the piston rod 22 can only move axially, it will gradually abut against and approach the brake disk 24, eliminate the axial gap, and generate a locking force; in the force increasing stage, in this way, the piston rod 22 will no longer move axially relative to the threaded rod 23; immediately afterwards, the driven disk 2 will no longer rotate, and while the ball 3 rotates, it moves axially, and the driven disk 2 will drive the piston rod 22 to move axially to perform braking.

[0060] Furthermore, the reset of the driven disk 2 can be assisted by a spring structure, that is, the spring structure assists the driven disk 2 to return to the initial position for the next braking. In the prior art, there are already descriptions of the settings of other structures of the driving disk 1 and the driven disk 2. The innovation of the present invention focuses on setting the groove structure to realize the axial pushing of the ball. For other technologies not mentioned, reference can be made to the braking technology of the ball ramp design in the prior art.

[0061] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

Claims

1. A braking thrust disc assembly with anti - detachment of ball bearings, characterized in that, Comprising: A driving disc (1) having a driving disc groove (5), the driving disc groove (5) forming a tapered structure in the axial direction, the driving disc (1) being used to connect a driving member for vehicle braking so that the driving disc (1) can move circumferentially; A driven disc (2) having a driven disc groove (7), the driven disc groove (7) forming a tapered structure in the axial direction, the driven disc (2) being used for vehicle braking and being able to move axially; A ball (3) disposed between the driving disc (1) and the driven disc (2), a part of the ball (3) being respectively embedded in the driving disc groove (5) and the driven disc groove (7); the driving disc (1) and the driven disc (2) are in an engaged state with each other.

2. The anti-loosening ball brake thrust disc assembly according to claim 1, characterized in that, The driving disc (1) has a driving disc end face (4), and a partial area on the driving disc end face (4) forms the driving disc groove (5); The driven disc (2) has a driven disc end face (6), and a partial area on the driven disc end face (6) forms the driven disc groove (7).

3. The anti-drop ball brake thrust disc assembly according to claim 1, characterized in that, Both the driving disc groove (5) and the driven disc groove (7) are in three groups, and each group of the cooperation between the driving disc groove (5) and the driven disc groove (7) holds a ball (3).

4. The anti-loosening ball brake thrust plate assembly according to claim 1, wherein, The driving disc groove (5) and the driven disc groove (7) extend from a lower starting point to a higher ending point.

5. The anti-drop ball brake thrust disc assembly according to claim 4, characterized in that The ball (3) has a starting position and an ending position during the movement between the driving disc (1) and the driven disc (2). In the state of the starting position, the ball (3) is located at the starting point position of the driving disc groove (5), and at this time, the spacing distance between the driving disc (1) and the driven disc (2) is the smallest; In the state of the ending position, the ball (3) is located at the ending point position of the driving disc groove (5), and at this time, the spacing distance between the driving disc (1) and the driven disc (2) is the largest.

6. The braking thrust disc assembly with anti - detachment ball according to claim 1, characterized in that, The driven disc (2) can perform circumferential movement.

7. The braking thrust disk assembly with anti-detachment ball according to claim 1, characterized in that, A toothed structure is provided on the circumferential outer wall of the driving disc (1).

8. The anti - detachment ball - type braking thrust disk assembly according to claim 1, characterized in that, The driven disc (2) is threadedly connected to a piston rod (22) that can move axially through a threaded rod (23).

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