Electronic mechanical brake device for brake-by-wire system

Abstract

The utility model relates to an electronic mechanical brake device for a brake-by-wire system. The electronic mechanical brake device comprises a motor, a planetary gear set, a pinion, a thrust bearing assembly, a screw and thread sleeve assembly and a brake block. The structure of the planetary gear, the pinion and the thrust bearing assembly is arranged, power is provided for the pinion through the planetary gear, the pinion drives the supporting piece of the thrust bearing assembly to rotate, and an instant increasing effect is formed at the position. In this way, a better driving effect is achieved on rotation of the supporting piece, the rear braking effect becomes stronger, and the reaction is faster.

Description

Technical Field

[0001] The utility model relates to a braking device, in particular to an electronic mechanical braking device used in a wire-controlled braking system. Background Art

[0002] At present, the disc brakes of vehicles on the market are mainly divided into two categories: pneumatic and hydraulic according to the different power transmission media. However, pneumatic and hydraulic brake systems generally have problems such as complex structure, environmental pollution, slow response, and complex control. They cannot adapt to the development trend of intelligent and wire-controlled vehicles in the future.

[0003] To overcome this problem, a brake-by-wire device has emerged in the prior art that is driven by a motor and uses a transmission assembly to achieve linear motion of a piston, replacing traditional pneumatic and hydraulic brakes. For example, a screw is used to achieve linear motion of a piston rod to achieve braking control.

[0004] However, there are certain problems with the existing motor transmission control. The planetary gears and bearing thrust components used are directly connected to each other, which makes the position setting unreasonable and cannot achieve the effect of quickly increasing torque during the braking process, resulting in insufficient braking force. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problems in the prior art, thereby providing a technology for quickly increasing torque when applying a force to a bearing thrust assembly.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an electromechanical brake device for a wire-controlled brake system, which includes a motor, a planetary gear set, a pinion, a thrust bearing assembly, a screw and sleeve assembly, and a brake block.

[0007] The planetary gear set cooperates with the drive shaft of the motor;

[0008] The pinion gear cooperates with the output shaft of the planetary gear set;

[0009] The thrust bearing assembly comprises a rolling element, a first support member, and a second support member. The outer ring of the first support member comprises a gear structure, the gear structure cooperates with the pinion, the rolling element is located between the first support member and the second support member, and the first support member and the second support member each comprise a curved raceway with varying depths, the curved raceway with varying depths cooperates with the rolling element.

[0010] The screw and sleeve assembly comprises a screw, a sleeve is sleeved on the screw, the sleeve can move axially, and the screw is fixedly connected to the second support member;

[0011] The brake block is used for braking the vehicle and is located on one axial side of the screw.

[0012] Preferably, the screw is fixedly connected to the second support member via a flange.

[0013] Preferably, a spacer is provided between the screw sleeve and the brake block.

[0014] Preferably, it also includes a shell assembly, which includes a lower shell flange surface, a lower shell, a caliper body and a caliper frame fixedly connected in sequence, the motor is arranged on one side of the lower shell flange surface, the planetary gear set and the thrust bearing assembly are arranged in the lower shell, the screw and sleeve assembly is arranged in the caliper body, and the brake block is arranged in the caliper frame.

[0015] Preferably, the brake block is slidably mounted in a slide groove of the clamp frame; the pad block is also slidably mounted in a slide groove of the clamp frame.

[0016] Preferably, the planetary gear set includes a sun gear, planetary gears, an output shaft and a fixed ring, the outside of the fixed ring is fixed to the flange surface of the lower housing, the sun gear is engaged with multiple groups of planetary gears, and the planetary gears are also engaged with the internal teeth of the fixed ring, the center of the planetary gear is connected to the output shaft, and the output shaft is connected to the pinion.

[0017] Preferably, the lower housing is connected to the caliper body via internal bolts to withstand the reaction force during braking.

[0018] Preferably, the motor is a conventional cylindrical motor structure, and the motor is mounted on the flange surface of the lower housing by bolts.

[0019] Preferably, the second support member is connected to a return spring, and the return spring drives the second support member to return to its original position after braking is completed.

[0020] Preferably, the rolling elements are located on the cage disk.

[0021] The beneficial effects of the present invention are as follows: the present invention sets up a structure of planetary gears, pinion gears and thrust bearing assembly. The power provided by the planetary gears is supplied to the pinion gears, which drives the support member of the thrust bearing assembly to rotate, and creates an instant torque increase at this position. This plays a better driving role in the rotation of the support member, making the subsequent braking effect stronger and more responsive.

[0022] In actual application, service braking: after the controller receives the braking request of the whole vehicle, it controls the motor to perform the braking action. The motor torque is transmitted to the thrust bearing assembly through the planetary gear and the pinion gear. The torque is amplified, driving the first support member in the thrust bearing assembly to rotate. At this time, if the sleeve is not in contact with the brake pad, the thrust bearing assembly rotates as a whole, driving the screw to rotate, pushing the sleeve to move linearly until there is no gap between the sleeve and the brake pad. Then the second support member of the thrust bearing stops rotating, and the first support member continues to rotate under the gear torque, driving the rolling body to roll in the curved raceway, converting the rotational torque into linear thrust, pushing the screw sleeve assembly and the brake pad to clamp the brake disc for braking.

[0023] Parking brake: The motor of this device can be integrated with a parking device, which can park the vehicle by locking the motor shaft. After receiving the parking request of the entire vehicle, the product controls the motor to perform the clamping action. When the clamping force reaches the target value, the motor maintains the pressure, and at this time controls the parking mechanism to park the vehicle. After the parking mechanism completes the parking action, the motor is powered off. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the overall structure of an electronic mechanical brake device for a wire-controlled brake system according to the present invention;

[0026] Figure 2 This is a schematic diagram of a partial structure of an electromechanical brake device for a wire-controlled brake system according to the present invention;

[0027] Figure 3 This utility model Figure 1 Schematic diagram of the AA cross-sectional view;

[0028] Figure 4 This utility model Figure 1 A schematic diagram of a BB cross-sectional view;

[0029] Figure 5 It is a schematic diagram of an exploded view of a thrust bearing assembly of an electromechanical brake device for a brake-by-wire system according to the present invention;

[0030] Figure 6 It is a schematic diagram of a first support member of a thrust bearing assembly of an electromechanical brake device for a brake-by-wire system according to the present invention;

[0031] Figure 7 This is a schematic diagram of a second support member of a thrust bearing assembly of an electromechanical brake device for a brake-by-wire system according to the present invention;

[0032] Description of reference numerals:

[0033] 01-motor; 02-planetary gear set; 03-pinion; 04-thrust bearing assembly; 05-screw and sleeve assembly; 06-brake block; 07-housing assembly;

[0034] 11- rolling element; 12- first support member; 13- second support member; 14- gear structure; 15- curved raceway with varying depth; 16- cage plate; 131- return spring;

[0035] 21-screw; 22-screw sleeve; 24-spacer;

[0036] 31- flange surface of lower housing; 32- lower housing; 33- clamp body; 34- clamp frame;

[0037] 41-sun gear; 42-planet gear; 43-output shaft; 44-fixed ring. DETAILED DESCRIPTION

[0038] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0039] Example 1:

[0040] like Figures 1 to 4 As shown, the utility model provides an electronic mechanical brake device for a wire-controlled brake system, which includes a motor 01, a planetary gear set 02, a pinion 03, a thrust bearing assembly 04, a screw and sleeve assembly 05 and a brake block 06.

[0041] The planetary gear set 02 cooperates with the drive shaft of the motor 01;

[0042] Pinion 03 cooperates with the output shaft of planetary gear set 02;

[0043] The thrust bearing assembly 04 comprises a rolling element 11, a first support member 12, and a second support member 13. The outer ring of the first support member 12 comprises a gear structure 14, which cooperates with the pinion 03. The rolling element 11 is located between the first support member 12 and the second support member 13. The first support member 12 and the second support member 13 each comprise a curved raceway 15 with varying depths, which cooperates with the rolling element 11.

[0044] Preferably, the diameter of the gear structure 14 is twice or more than twice that of the pinion 03 to achieve the effect of increasing torque.

[0045] The screw and sleeve assembly 05 has a screw 21, on which a sleeve 22 is sleeved. The sleeve 22 can move axially, and the screw 21 is fixedly connected to the second support member 13; the sleeve 22 cooperates with the screw 21 through a thread; the sleeve 22 is configured to only be able to move axially but not rotate, for example, the side of the sleeve 22 realizes axial movement through the cooperation of a sliding block and a slideway.

[0046] The brake block 06 is used for braking the vehicle, and is located on one axial side of the screw rod 21 .

[0047] The motion process of the thrust bearing assembly 04 is:

[0048] In the initial stage, there is a gap between the screw sleeve 22 and the brake block 06. When the first support member 12 rotates, it drives the rolling element 11 and the second support member 13 to rotate, and the second support member 13 drives the screw rod 21 to rotate. Since the screw sleeve 22 can only move axially, the screw sleeve 22 realizes axial movement by cooperating with the thread pair of the screw rod 21, and finally the end of the screw sleeve 22 contacts the brake block 06 to generate a locking force.

[0049] In the force-increasing stage, the first support member 12 continues to rotate, the second support member 13 stops rotating, and the rolling body 11 rotates while performing axial movement, thereby causing the second support member 13 to perform axial movement, thereby driving the screw sleeve 22 to form a force-increasing braking action.

[0050] To further illustrate, the depth-varying curved raceway 15 of the first support member 12 and the second support member 13 gradually transitions from a shallower position to a deeper position. In the initial position, the deeper position contacts the rolling element 11, and the shallower position gradually contacts the rolling element 11 during movement.

[0051] In addition, in the prior art, it is preferred to further provide an elastic member such as a spring for resetting. The elastic member is provided for the automatic resetting process of the second support member 13 , which belongs to the prior art and will not be described in detail here.

[0052] Example 2:

[0053] Preferably, the screw rod 21 is fixedly connected to the second support member 13 via a flange.

[0054] Preferably, there is a pad 24 between the screw sleeve 22 and the brake block 06. The effect of the pad 24 is to increase the contact area between the screw sleeve and the brake block and improve the uneven wear during braking.

[0055] Preferably, it also includes a housing assembly 07, which includes a lower shell flange surface 31, a lower shell 32, a caliper body 33 and a caliper frame 34 that are fixedly connected in sequence, the motor 01 is arranged on one side of the lower shell flange surface 31, the planetary gear set 02 and the thrust bearing assembly 04 are arranged in the lower shell 32, the screw and sleeve assembly 05 is arranged in the caliper body 33, and the brake block 06 is arranged in the caliper frame 34.

[0056] Preferably, the brake block 06 can be slidably installed in the slide groove of the clamp frame 34; the pad block 24 can also be slidably installed in the slide groove of the clamp frame 34.

[0057] Preferably, the planetary gear 02 group includes a sun gear 41, planetary gears 42, an output shaft 43 and a fixed ring 44, the outside of the fixed ring 44 is fixed to the flange surface 31 of the lower shell, the sun gear 41 is engaged with multiple groups of planetary gears 42, and the planetary gears 42 are also engaged with the internal teeth of the fixed ring 44, the center of the planetary gear 42 is connected to the output shaft 43, and the output shaft 43 is connected to the pinion 03.

[0058] Preferably, the lower housing 32 is connected to the caliper body 33 via internal bolts to withstand the reaction force during braking.

[0059] Preferably, the motor 01 is a conventional cylindrical motor structure, and the motor 01 is mounted on the lower housing flange surface 31 by bolts.

[0060] Preferably, the second support member 13 is connected to a return spring 131 , and the return spring 131 drives the second support member 13 to return to its original position after braking is completed.

[0061] Preferably, the rolling elements 11 are located on the retaining plate 16. The rolling elements 11 are rotatably disposed on the retaining plate 16. The arrangement of the retaining plate 16 allows the plurality of rolling elements 11 to form a whole and avoid dislocation and escape.

[0062] The beneficial effects of the present invention are as follows: the present invention provides a thrust bearing assembly and a screw sleeve assembly, thereby realizing power transmission and achieving the purpose of rapid response braking.

[0063] In actual application, service braking: after the controller receives the braking request of the whole vehicle, it controls the motor to perform the braking action. The motor torque is transmitted to the thrust bearing assembly through the planetary gear and the pinion gear, driving the first support member in the thrust bearing assembly to rotate. At this time, if the sleeve is not in contact with the brake pad, the thrust bearing assembly rotates as a whole, driving the screw to rotate, pushing the sleeve to move linearly until there is no gap between the sleeve and the brake pad. Then the second support member of the thrust bearing stops rotating, and the first support member continues to rotate under the gear torque, converting the rotational torque into linear thrust, pushing the screw sleeve assembly and the brake pad to clamp the brake disc for braking.

[0064] Parking brake: The motor of this device can be integrated with a parking device, which can park the vehicle by locking the motor shaft. After receiving the parking request of the entire vehicle, the product controls the motor to perform the clamping action. When the clamping force reaches the target value, the motor maintains the pressure, and at this time controls the parking mechanism to park the vehicle. After the parking mechanism completes the parking action, the motor is powered off.

[0065] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An electromechanical brake device for a wire control brake system, characterized in that: include: Motor (01); A planetary gear set (02) is coupled to the drive shaft of the motor (01); The pinion (03) cooperates with the output shaft of the planetary gear set (02); A thrust bearing assembly (04) comprises a rolling element (11), a first support member (12) and a second support member (13); the outer ring of the first support member (12) comprises a gear structure (14); the gear structure (14) cooperates with the pinion (03); the rolling element (11) is located between the first support member (12) and the second support member (13); the first support member (12) and the second support member (13) both comprise a curved raceway (15) with varying depths; the curved raceway (15) with varying depths cooperates with the rolling element (11); A screw and sleeve assembly (05) comprises a screw (21), a sleeve (22) is sleeved on the screw (21), the sleeve (22) is capable of axial movement, and the screw (21) is fixedly connected to the second support member (13); The brake block (06) is used for braking the vehicle and is located on one axial side of the screw (21).

2. The electromechanical brake device for a wire control brake system according to claim 1, characterized in that: The screw rod (21) is fixedly connected to the second support member (13) via a flange.

3. The electromechanical brake device for a wire control brake system according to claim 1, characterized in that: A pad (24) is provided between the screw sleeve (22) and the brake block (06).

4. The electromechanical brake device for a brake-by-wire system according to claim 3, characterized in that: The invention also includes a housing assembly (07), wherein the housing assembly (07) includes a lower housing flange surface (31), a lower housing (32), a caliper body (33) and a caliper frame (34) which are fixedly connected in sequence, the motor (01) is arranged on one side of the lower housing flange surface (31), the planetary gear set (02) and the thrust bearing assembly (04) are arranged in the lower housing (32), the screw sleeve assembly (05) is arranged in the caliper body (33), and the brake block (06) is arranged in the caliper frame (34).

5. The electromechanical brake device for a brake-by-wire system according to claim 4, characterized in that: The brake block (06) can be slidably mounted in a slide groove of the clamp frame (34); the pad block (24) can also be slidably mounted in the slide groove of the clamp frame (34).

6. The electromechanical brake device for a brake-by-wire system according to claim 4, characterized in that: The planetary gear set (02) includes a sun gear (41), planetary gears (42), an output shaft (43) and a fixed ring (44). The exterior of the fixed ring (44) is fixed to the flange surface (31) of the lower housing. The sun gear (41) is meshed with multiple sets of planetary gears (42). The planetary gears (42) are also meshed with the internal teeth of the fixed ring (44). The center of the planetary gear (42) is connected to the output shaft (43), and the output shaft (43) is connected to the pinion (03).

7. The electromechanical brake device for a brake-by-wire system according to claim 4, wherein: The lower housing (32) is connected to the caliper body (33) via internal bolts to withstand the reaction force during braking.

8. The electromechanical brake device for a brake-by-wire system according to claim 4, wherein: The motor (01) is a conventional cylindrical motor structure, and the motor (01) is mounted on the lower housing flange surface (31) by means of bolts.

9. The electromechanical brake device for a brake-by-wire system according to claim 1, wherein: The second support member (13) is connected to a return spring (131), and when braking is completed, the return spring (131) drives the second support member (13) to return to its original position.

10. The electromechanical brake device for a brake-by-wire system according to claim 1, wherein: The rolling elements (11) are located on the cage disc (16).

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