Electromechanical caliper structure and method

Abstract

The invention provides an electronic mechanical caliper structure and method. The electronic mechanical caliper structure comprises a caliper body, a driving motor, a horizontal gear assembly, a planetary gear assembly, a power conversion assembly and a friction plate. The driving motor provides power, the power is transmitted to the horizontal gear assembly through the output shaft, the horizontal gear assembly transmits the power to the planetary gear assembly, then the power is transmitted through the mandrel, torque on the mandrel is transmitted to the lead screw through the spring ball assembly, and when the lead screw moves axially, rotating power is converted into linear thrust; the linear thrust brake device has the beneficial effects that the lead screw structure receives power from the inside and outputs power from the outside, the overall stress is more stable, and the bearing capacity is improved. Compared with pneumatic and hydraulic braking devices, the whole vehicle does not need to additionally provide pneumatic and hydraulic pressure sources, and the system is simpler, faster in response, shorter in braking distance and safer.

Description

Technical Field

[0001] The invention relates to vehicle braking technology, and in particular to an electronic mechanical caliper structure. 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, and cannot adapt to the development trend of intelligent and wire-controlled vehicles in the future. Therefore, this patent aims to design an electronic mechanical caliper structure to replace traditional pneumatic and hydraulic brakes.

[0003] In the prior art, there are brakes that use electric drive. The main principle is that the motor provides power and then brakes through the thrust conversion structure; that is, the thrust conversion structure converts the rotational power of the motor into linear thrust, and then the linear thrust completes the braking process. This braking method is easier to achieve linear control and achieve the purpose of precise control. It also has the advantages of simple structure, environmental friendliness, and fast response. However, among the existing thrust conversion structures, there are thrust conversions that are achieved using a screw structure, and an axial push structure is also required, which is a relatively complex structure. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned technology, the present invention provides a technology that relies on the internal and external structures of the lead screw to realize thrust transmission and simplify the overall structure.

[0005] The present invention provides an electronic mechanical caliper structure, which is used in a wire-controlled brake system; the electronic mechanical caliper structure comprises a caliper body, a drive motor, a flat gear assembly, a planetary gear assembly, a power conversion assembly and a friction plate;

[0006] The driving motor is fixed on the clamp body;

[0007] The spur gear assembly has a plurality of sets of meshing gears, and one side of the spur gear assembly is connected to the output shaft of the driving motor;

[0008] The planetary gear assembly is connected to the other side of the spur gear assembly;

[0009] A power conversion assembly, the power conversion assembly includes a core shaft, a lead screw, a nut and a piston, the core shaft has a core shaft raceway; the core shaft cooperates with the planetary gear assembly to receive power; the lead screw has an inner lead screw raceway and an outer lead screw raceway, the core shaft is located in the inner hole of the lead screw, and the inner lead screw raceway cooperates with the core shaft raceway; the nut is fixed on the caliper body, the nut has an inner nut thread, the inner nut thread cooperates with the outer lead screw raceway through a rolling body, and the outer peripheral wall of the nut has axially arranged horizontal slide grooves symmetrically on both sides; the piston is limited to horizontal movement;

[0010] A friction plate is mounted on the caliper body, and the piston contacts the friction plate after axial movement.

[0011] Preferably, the spur gear assembly comprises a motor gear, a bridge gear and a large gear which are meshed and connected in sequence, and the motor gear is connected to the output shaft of the driving motor.

[0012] Preferably, it further comprises a spring ball assembly, the spring ball assembly having a ball and springs arranged on both sides of the ball; the spring ball assembly is located between the inner raceway of the lead screw and the raceway of the mandrel;

[0013] A guide steel ball is arranged in the horizontal slide groove; the piston has a steel ball groove matched with the guide steel ball, and the piston follows the axial movement of the lead screw.

[0014] Preferably, the inner hole of the lead screw forms a first retaining wall, the core shaft has a second retaining wall, the first retaining wall and the second retaining wall form a compression space, springs are arranged on both sides of the ball, and the spring ball assembly is arranged in the compression space.

[0015] Preferably, the core shaft raceway and the inner raceway of the lead screw are arranged in multiple groups in the axial direction.

[0016] Preferably, the bearing seat has a main body and a protruding portion, and the main body cooperates with the piston through a cylindrical roller bearing.

[0017] Preferably, the protrusion cooperates with the piston via a sliding bushing.

[0018] Preferably, the end of the protrusion is fitted into the mounting groove of the outer end of the piston through a retaining spring, a needle bearing and a wave spring.

[0019] Preferably, the installation portion has a dust cover.

[0020] Preferably, the upstream end of the core shaft has a drive fitting portion, and the drive fitting portion is used to receive power for driving the motor to rotate.

[0021] The beneficial effects of the present invention are:

[0022] 1. The screw structure receives power from the inside and outputs power from the outside, making the overall force more stable and improving the bearing capacity.

[0023] 2. Compared with pneumatic and hydraulic brake devices, the vehicle does not need to provide additional pneumatic and hydraulic pressure sources. The system is simpler, responds faster, has a shorter braking distance, and is safer.

[0024] 3. The structure of the spring ball assembly and horizontal raceway used is different from that of traditional linear bearings. It can not only realize low-friction rolling motion in the horizontal direction, but also withstand torque and transmit the torque of the mandrel to the screw. The bearing capacity of the screw is increased and the efficiency is higher.

[0025] 4. The structure of ball screw, spring ball assembly, planetary gear and flat gear is adopted, which greatly reduces the structural size of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the overall structure of an electronic mechanical caliper structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the overall decomposition of an electronic mechanical caliper structure of the present invention;

[0028] Figure 3 It is a structural schematic diagram of an overall structure of an electronic mechanical caliper structure of the present invention at one angle;

[0029] Figure 4 The present invention is an electronic mechanical caliper structure Figure 3 The structural diagram of the AA section view;

[0030] Figure 5 It is a structural schematic diagram of the decomposed thrust conversion structure of an electronic mechanical caliper structure of the present invention;

[0031] Figure 6 The present invention is an electronic mechanical caliper structure Figure 5 A schematic diagram of the structure of an angled cross-sectional view;

[0032] Figure 7 It is a structural schematic diagram of a lead screw of an electronic mechanical caliper structure of the present invention;

[0033] Figure 8 It is a structural schematic diagram of a nut of an electronic mechanical caliper structure of the present invention;

[0034] Fig. 9 It is a structural schematic diagram of a piston of an electronic mechanical caliper structure of the present invention;

[0035] Fig.10 It is a schematic diagram of the exploded structure of a spur gear assembly of an electronic mechanical caliper structure of the present invention;

[0036] Fig.11 It is a schematic diagram of the exploded structure of a planetary gear assembly of an electronic mechanical caliper structure of the present invention;

[0037] Fig.12 It is a structural schematic diagram of a planetary gear assembly of an electronic mechanical caliper structure of the present invention at one angle;

[0038] Fig.13 The present invention is a planetary gear assembly of an electronic mechanical caliper structure Fig.12 BB section view of the structure diagram;

[0039] Description of reference numerals:

[0040] 10- mandrel; 11- mandrel raceway; 121- first retaining wall; 122- second retaining wall; 13- driving mating portion;

[0041] 20-spring ball assembly; 21-ball; 22-spring;

[0042] 30-screw; 31-screw inner raceway; 32-screw outer raceway;

[0043] 40-nut; 41-internal thread of nut; 42-horizontal slide;

[0044] 50-piston; 51-steel ball groove; 52-guide steel ball; 53-installation part;

[0045] 60- rolling element;

[0046] 70-bearing seat; 71-main body; 72-protruding part;

[0047] 80-cylindrical roller bearing; 90-bushing; 100-circlip; 110-needle roller bearing; 120-wave spring; 130-dust cover;

[0048] 140- clamp body;

[0049] 150-driving motor; 151-output shaft;

[0050] 160- flat gear assembly; 161- motor gear; 162- bridge gear; 163- large gear;

[0051] 170-planetary gear assembly; 171-planet carrier; 172-planetary gear; 173-sun gear; 174-inner ring gear; 180-friction plate. DETAILED DESCRIPTION

[0052] First embodiment:

[0053] like Figures 1 to 9 As shown, the present invention provides an electronic mechanical caliper structure, which includes a caliper body 140, a drive motor 150, a flat gear assembly 160, a planetary gear assembly 170, a power conversion assembly and a friction plate 180;

[0054] The driving motor 150 is fixed on the clamp body 140 ; ​​the driving motor 150 is used to provide power.

[0055] The spur gear assembly 160 has multiple sets of meshing gears, and one side of the spur gear assembly 160 is connected to the output shaft 151 of the drive motor 150; the spur gear assembly 160 is composed of multiple meshing gears, which are used to transmit the rotational power provided by the motor to a parallel position on the side, which can save space and avoid the layout that requires too long a straight line space.

[0056] The planetary gear assembly 170 is connected to the other side of the spur gear assembly 160 ; the planetary gear assembly 170 is used to stably transmit the power provided by the spur gear assembly 160 .

[0057] The power conversion assembly includes a spindle 10, a lead screw 30, a nut 40 and a piston 50, wherein the spindle 10 has a spindle raceway 11, and the spindle 10 cooperates with the planetary gear assembly 170 to receive power; the lead screw 30 has a lead screw inner raceway 31 and a lead screw outer raceway 32, the spindle 10 is located in the inner hole of the lead screw 30, and the lead screw inner raceway 31 cooperates with the spindle raceway 11; the nut 40 is fixed on the caliper body 140, the nut 40 has a nut inner thread 41, the nut inner thread 41 cooperates with the lead screw outer raceway 32 through a rolling body 60, and the outer peripheral wall of the nut 40 has an axially arranged horizontal slide groove 42; the piston 50 is limited to horizontal movement;

[0058] Preferably, a spring ball assembly 20 is also included, and the spring ball assembly 20 has a ball 21 and springs 22 arranged on both sides of the ball 21; the springs on both sides clamp the ball 21 in the middle position to maintain the position of the ball 21, which is conducive to maintaining stability during movement. The spring ball assembly 20 is located between the inner raceway 31 of the screw and the core shaft raceway 11.

[0059] Preferably, the outer wall of the nut 40 is symmetrically provided with axially arranged horizontal grooves 42, and a guide steel ball 52 is arranged in the horizontal groove 42; when the screw 30 rotates, the nut 40 and the caliper body 140 are kept fixed as a whole, so the screw 30 will simultaneously move axially through the action of the rolling body 60, that is, the driving mode of the ball screw pair. When the screw 30 moves axially relative to the core shaft 10, the springs on both sides keep the position of the ball 21 stable, and the screw 30 and the core shaft 10 move relative to each other through the ball 21. This movement overcomes little friction and moves smoothly.

[0060] The piston 50 has a steel ball groove 51 that cooperates with the guide steel ball 52. The piston 50 follows the axial movement of the lead screw 30. The guide steel ball 52 slides in the horizontal slide groove 42 on the outer peripheral wall of the nut 40 to prevent the piston 50 from rotating. When the lead screw 30 moves axially, it drives the piston 50 to move axially. The downstream side of the piston 50 is a friction plate 180 (brake plate), and friction braking is completed by contacting with the friction plate 180. The piston 50 slides axially relative to the nut 40 through the guide steel ball 52, and the friction force is small.

[0061] The piston 50 is mounted on the caliper body 140 and contacts the friction plate 180 after axial movement.

[0062] In a specific application, the driving motor 150 provides power, which is transmitted to the flat gear assembly 160 through the output shaft 151, and the flat gear assembly 160 is transmitted to the planetary gear assembly 170, and then transmitted through the mandrel 10 of the thrust conversion assembly. The torque on the mandrel 10 is transmitted to the screw 30 through the ball 21 of the spring ball assembly 20. When the screw 30 moves axially, the ball 21 in the assembly rolls in the axial raceway formed by the screw 30 and the slide shaft, reducing the friction between the mandrel 10 and the screw 30, and finally converting the rotational power into a linear thrust, which is braked by the friction plate 180 for braking on the downstream side of the piston 50;

[0063] When the screw 30 moves horizontally relative to the core shaft 10 under the action of other external forces, the two sides of the ball 21 are in contact with the screw 30 and the core shaft 10 respectively, and the ball 21 rolls in the axial raceway formed by the core shaft 10 and the screw 30. The screw 30, the ball 21 and the core shaft 10 form a structure similar to a linear bearing. Because there is only rolling friction, the efficiency is higher.

[0064] Second embodiment:

[0065] Preferably, combined Fig.10 As shown, the flat gear assembly 160 has a motor gear 161, a bridge gear 162 and a large gear 163 that are meshed and connected in sequence, and the motor gear 161 is connected to the output shaft 151 of the driving motor 150. The output shaft 151 transmits the power of the motor 150 through the motor gear 161, the bridge gear 162 and the large gear 163 in sequence.

[0066] Preferably, combined Figures 11 to 13As shown, the planetary gear assembly 170 has a planet carrier 171, planetary wheels 172, a sun gear 173 and an inner ring gear 174. The sun gear 173 is set at the center position of the planet carrier 171, the sun gear 173 is meshed with multiple planetary wheels 172, the planetary wheels 172 are meshed with the inner ring gear 174, and the inner ring gear 174 is installed on the planet carrier 171; when the sun gear 173 rotates, it drives multiple planetary wheels 172 to rotate at the same time to achieve stable transmission.

[0067] The sun gear 173 is connected to the large gear 163 via a connecting rod.

[0068] The planetary gears 172 and the sun gear 173 on the planetary carrier 171 are both provided with bearings to improve positioning accuracy and operating efficiency;

[0069] In specific operation, the output power of the driving motor 150 drives the motor gear 161 to rotate through the output shaft 151, the motor gear 161 engages to drive the bridge gear 162 to rotate, the bridge gear 162 engages to drive the large gear 163 to rotate, the large gear 163 drives the sun gear 173 to rotate through the connecting rod, the sun gear 173 engages to drive the planetary gear 172 to rotate, and the planetary gear 172 engages with the inner ring gear 174 on the planetary carrier 171.

[0070] The downstream end of the sun gear 173 cooperates with the core shaft 10 to achieve rotational driving of the core shaft 10 .

[0071] Third embodiment:

[0072] Preferably, the inner hole of the lead screw 30 forms a first retaining wall 121, the mandrel 10 has a second retaining wall 122, the first retaining wall 121 and the second retaining wall 122 form a compression space, springs 22 are arranged on both sides of the ball 21, and the spring ball assembly 20 is arranged in the compression space; this structure is used to limit the spring ball assembly 20. The springs 22 on both sides abut or are connected between the first retaining wall 121 and the second retaining wall 122, so that the ball 21 is in the middle position of the mandrel raceway 1, and the elastic force of the spring 22 keeps the position of the ball 21 stable.

[0073] Preferably, the mandrel raceway 11 and the lead screw inner raceway 31 are both arranged in multiple groups in the axial direction;

[0074] The spring ball assembly 20 corresponding to the above axially arranged multiple groups of raceways is composed of multiple springs 22 and balls 21. The compressible stroke of the spring 22 is greater than the horizontal movement stroke of the piston 50 to ensure that the movement of the ball 21 is pure rolling. The springs 22 arranged on both sides can keep the ball 21 in the middle position at all times.

[0075] Preferably, the bearing seat 70 has a main body 71 and a protruding portion 72, and the main body 71 cooperates with the piston 50 through a cylindrical roller bearing 80;

[0076] Preferably, the protrusion 72 cooperates with the piston 50 through a sliding bushing 90 , and the main body 71 and the protrusion 72 play a supporting and positioning effect.

[0077] Preferably, the end of the protrusion 72 is fitted into a groove of the mounting portion 53 at the outer end of the piston 50 through a retaining spring 100 , a needle bearing 110 and a wave spring 120 .

[0078] Specifically, the retaining spring 100 is fixed on the protrusion 72, the needle bearing 110 is located between the retaining spring 100 and the wave spring 120, and the other end of the wave spring 120 is against the piston 50; with such a structure, on the one hand, the protrusion 72 can stably rotate around the needle bearing 110, and the wave spring 120 provides pressure to keep the bearing in a stable state. The bearing structure arranged at two positions, namely the needle bearing 110 and the cylindrical roller bearing 80 arranged at the front and rear sides respectively, makes the rotation of the lead screw 30 more stable and balanced.

[0079] In addition, a cylindrical roller bearing 80 and a needle bearing 110 are provided between the piston 50 and the bearing seat 70, which not only prevents the direct contact and friction between the screw 30 and the mating surface of the piston 50 when the screw 30 rotates, but also can pull the piston 50 back when the screw 30 retracts; that is, the piston 50 is pulled back by the retaining spring 100, the needle bearing 110 and the wave spring 120.

[0080] Preferably, the installation portion 53 has a dust cover 130, and the dust cover 130 seals the components such as the lead screw 30 inside the piston 50 to play a protective role.

[0081] Preferably, the upstream end of the core shaft 10 has a drive fitting portion 13, and the drive fitting portion 13 is used to receive the power of the drive motor 150 to rotate; that is, the drive fitting portion 13 can cooperate with the sun gear to receive power.

Claims

1. An electronic mechanical caliper structure, characterized in that: The electronic mechanical caliper structure is used in the wire control brake system, and the electronic mechanical caliper structure includes: A clamp body (140); A driving motor (150) fixed on the clamp body (140); A spur gear assembly (160) having a plurality of groups of meshing gears, one side of the spur gear assembly (160) being connected to an output shaft (151) of the driving motor (150); A planetary gear assembly (170) connected to the other side of the spur gear assembly (160); A power conversion assembly, the power conversion assembly comprising a core shaft (10), a lead screw (30), a nut (40) and a piston (50), wherein the core shaft (10) has a core shaft raceway (11), and the core shaft (10) cooperates with the planetary gear assembly (170) to receive power; the lead screw (30) has an inner lead screw raceway (31) and an outer lead screw raceway (32), the core shaft (10) is located in the inner hole of the lead screw (30), and the inner lead screw raceway (31) cooperates with the core shaft raceway (11); the nut (40) is fixed on the caliper body (140), the nut (40) has a nut internal thread (41), the nut internal thread (41) cooperates with the lead screw outer raceway (32) through a rolling body (60), and the outer peripheral wall of the nut (40) has an axially arranged horizontal slide groove (42); the piston (50) is limited to horizontal movement; A friction plate (180) is mounted on the caliper body (140), and the piston (50) contacts the friction plate (180) after axial movement.

2. The electromechanical caliper structure according to claim 1, characterized in that: The spur gear assembly (160) comprises a motor gear (161), a bridge gear (162) and a large gear (163) which are meshed and connected in sequence, and the motor gear (161) is connected to the output shaft (151) of the driving motor (150).

3. The electromechanical caliper structure according to claim 2, characterized in that: It also includes a spring ball assembly (20), the spring ball assembly (20) having a ball (21) and springs (22) arranged on both sides of the ball (21); the spring ball assembly (20) is located between the inner raceway (31) of the lead screw and the core shaft raceway (11); A guide steel ball (52) is arranged in the horizontal slide groove (42); the piston (50) has a steel ball groove (51) matched with the guide steel ball (52), and the piston (50) follows the axial movement of the lead screw (30).

4. The electromechanical caliper structure according to claim 3, characterized in that: The inner hole of the lead screw (30) forms a first retaining wall (121), the core shaft (10) has a second retaining wall (122), the first retaining wall (121) and the second retaining wall (122) form a compression space, springs 22 are arranged on both sides of the ball 21, and the spring ball assembly (20) is arranged in the compression space.

5. The electromechanical caliper structure according to claim 1, characterized in that: The core shaft raceway (11) and the lead screw inner raceway (31) are both arranged in multiple groups in the axial direction.

6. The electromechanical caliper structure according to claim 1, characterized in that: The bearing seat (70) comprises a main body (71) and a protruding portion (72), and the main body (71) is matched with the piston (50) via a cylindrical roller bearing (80).

7. The electromechanical caliper structure according to claim 6, characterized in that: The protrusion (72) cooperates with the piston (50) via a sliding bushing (90).

8. The electromechanical caliper structure according to claim 6, characterized in that: The end of the protrusion (72) is fitted into a groove of a mounting portion (53) at the outer end of the piston (50) through a retaining spring (100), a needle bearing (110) and a wave spring (120).

9. The electromechanical caliper structure according to claim 8, characterized in that: The installation part (53) has a dust cover (130); The upstream end of the core shaft (10) is provided with a driving fitting portion (13), and the driving fitting portion (13) is used to receive the power of the driving motor (150) for rotation.

10. The method for using the electronic mechanical caliper structure according to any one of claims 1 to 9, characterized in that: The following steps are included: The driving motor (150) provides power, which is transmitted to the spur gear assembly (160) through the output shaft (151), and the spur gear assembly (160) is transmitted to the planetary gear assembly (170), and then transmitted through the core shaft (10). The torque on the core shaft (10) is transmitted to the lead screw (30) through the spring ball assembly (20). When the lead screw (30) moves axially, the rotational power is converted into a linear thrust, and the linear thrust brakes the friction plate (180) through the piston (50).

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