Multi-piston electronic mechanical brake and vehicle

Abstract

The invention provides a multi-piston electronic mechanical brake which is characterized in that the multi-piston electronic mechanical brake comprises a motor, an output gear of the motor, an intermediate gear, a large gear and a sun gear which are sequentially connected, the sun gear is connected with a planetary gear, the planetary gear is provided with a planet carrier, and the outer ring of the planet carrier is of a gear structure; an outer ring gear structure of the planet carrier is meshed with a driving gear of the ball screw, the lead screw is driven to rotate through the driving gear, and therefore the nut piston is driven to move towards the friction plate or move away from the friction plate. And therefore, the EMB has the performance advantage of a multi-piston structure.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle electronic mechanical braking, and in particular to a multi-piston electronic mechanical braking device and a vehicle. Background Art

[0002] The Electro-Mechanical Braking System (EMB) is a system that uses a motor to drive a deceleration mechanism, and converts rotational motion into linear motion through a motion conversion mechanism, pushing the friction plate to clamp the brake disc to achieve vehicle braking.

[0003] The existing technologies related to electronic mechanical brakes are all single-piston technologies. The single-piston structure certainly has the advantage of simplified structure, but due to the space limitation of the whole vehicle, the area and diameter range of the friction plate and brake disc will not change much. As the clamping force demand increases, the single-piston structure itself can only achieve a greater clamping force by increasing the piston diameter. However, simply increasing the piston diameter will be limited by the space of the brake caliper bracket and the caliper body. At the same time, when the piston diameter is larger than the radial width of the friction plate, a part of the piston will not be pressed onto the friction plate. Under the condition of large clamping force, it is easy to produce disadvantages such as deformation of the edge of the friction plate and uneven force. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a multi-piston electronic mechanical brake and a vehicle thereof. The present invention expands on the single-piston EMB structure and can achieve multi-piston electronic mechanical braking through a new structural arrangement, thereby making the EMB have the performance advantages of a multi-piston structure.

[0005] To achieve the above object, the present invention provides the following technical solutions: A multi-piston electronic mechanical brake comprises a motor, an output gear of the motor, an intermediate gear, a large gear and a sun gear connected in sequence, wherein the sun gear is connected to a planetary gear, and the planetary gear is provided with a planetary carrier, the outer ring of the planetary carrier is a gear structure, and the outer ring gear structure of the planetary carrier is meshed with a driving gear of a ball screw, and the screw is driven to rotate by the driving gear, thereby driving the nut piston to move toward or away from the friction plate.

[0006] As a further solution of the present invention, a ring gear is arranged on the outside of the planetary gear.

[0007] As a further solution of the present invention, a driving gear is respectively provided on two parallel sides of the planetary carrier axis, and each of the driving gears is connected to a ball screw and a piston nut.

[0008] As a further solution of the present invention, at least one brake unit is arranged outside the driving gear, and each brake unit includes an idler gear, a driving gear, a lead screw and a nut piston that are meshed in sequence.

[0009] As a further solution of the present invention, the connection line between the motor and the sun gear and the connection line between the centers of the nut pistons are arranged in parallel or at any other angle that does not affect the layout of the entire vehicle.

[0010] As a further solution of the present invention, the angle of the connection between the axis of the sun gear and the axis of the driving gear of the lead screw is arranged according to the actual space of the whole vehicle and the relative position of the friction plate.

[0011] The present invention also provides a vehicle using the multi-piston electronic mechanical brake.

[0012] The present invention has the following beneficial effects: The present invention expands on the single-piston EMB structure and can achieve multi-piston electronic mechanical braking through a new structural arrangement, thereby enabling the EMB to have the performance advantages of a multi-piston structure.

[0013] The present invention can realize multi-pistonization of the vehicle EMB device, so that the vehicle EMB system device can achieve better braking performance while having a larger friction plate force area and a more uniform clamping force distribution, and can also reduce the jitter and vibration during the braking process, reduce the brake temperature during braking, and thus extend the life of the braking system; the present invention adjusts the mechanical structure of the vehicle EMB system to enable the most commonly used motor + reducer + ball screw + piston structure EMB system to achieve the ability of a set of execution structure to drive two or even more pistons.

[0014] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 , Figure 2 Schematic diagram of the structure of different embodiments of a multi-piston electromechanical brake mentioned in the present invention.

[0016] Figure 3 , Figure 4 It is a schematic structural diagram of an optional embodiment of the driving gear and the planetary carrier gear in the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further explained below in conjunction with the accompanying drawings and related knowledge, and described clearly and completely. Obviously, the described application is only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Reference Figure 1-Figure 4As shown, a multi-piston electronic mechanical brake of the present invention comprises a motor 1, an output gear 2 of the motor, an intermediate gear 3, a large gear 4, and a sun gear 5 connected in sequence, the sun gear 5 is connected to a planetary gear 6, the planetary gear 6 is provided with a planetary carrier, the outer ring of the planetary carrier 8 is a gear structure, the outer ring gear structure of the planetary carrier 8 is meshed with a driving gear 9 of a ball screw 10, and the screw 10 is driven to rotate by the driving gear 9, thereby driving the nut piston 11 to move toward or away from the friction plate 12. When braking, the nut piston 11 is driven to move toward the friction plate 12, and moves away from the friction plate when the braking is cancelled.

[0019] As a further improvement, refer to Figure 1 As shown, a gear ring 7 is arranged on the outside of the planetary gear, and a driving gear 9 is arranged on both sides of the planetary carrier 8, and each driving gear 9 is connected to a lead screw 10; thus, a motor + a set of reducer structure can be realized to drive two pistons. And the movement of the two pistons is synchronous, that is, the clamping force generated by the two pistons is consistent. While achieving higher braking performance, higher system life and other purposes, it can also ensure the uniformity of the distribution of the clamping force, and will not cause the problem of uneven clamping force due to the addition of a clamping force source.

[0020] Reference Figure 2 As shown, at least one brake unit is arranged outside the driving gear 9, and each brake unit includes an idler gear 13, a driving gear 9 and a lead screw 10 which are meshed in sequence, that is, a plurality of nut pistons can be added to move toward the friction plate to generate a greater clamping force and achieve a higher braking performance. In this embodiment, it is preferred to add a set of brake units. Figure 1 The original two sets of brake units are replaced by an additional set of brake units, thereby achieving the scalability of the brake system.

[0021] The specific working process is as follows: Figure 1-Figure 4 As shown, when the motor 1 drives the system to run, the force transmission path is through the motor 1 output gear 2, transmitted to the intermediate gear 3, and then transmitted to the large gear 4, and then through the sun gear 5 connected to 4, driving the planetary gear 6 placed in the fixed gear ring 7, and then driving the planetary carrier 8. The outer ring of the planetary carrier 8 is a gear structure, and then meshes with the driving gear 9 of the ball screw, driving the screw 10 to rotate, and finally realizing the movement of the nut piston 11 toward the friction plate 12, and pressing the friction plate 12 to achieve vehicle braking.

[0022] When the gear of the planet carrier 8 rotates, the driving gear 9 of the ball screw 10 meshes with the teeth of the gear of the planet carrier 8, so the driving gear 9 has the same direction and the same speed. In a mechanical structure, it is ensured that the nut pistons 11 of the two ball screws are pressed synchronously 12 during compression, so that the uniform distribution of the clamping force is achieved. At the same time, a larger clamping area is achieved on the friction plate 12 compared to the single piston compression, which can achieve a greater clamping force. Under the same braking force, this structure can reduce the demand for clamping force and the system temperature compared to the single piston structure because the force area is increased, which reduces the deformation of the friction plate and the system caused by uneven temperature and the NVH problem caused by it.

[0023] As attached Figure 2 As shown, the structure can also add one or more idler wheels 13 in addition to the ball screw drive gear 9, and the same number of new ball screw drive gears 9, screws 10 and nut pistons 11 to achieve a configuration with more pistons for application in vehicles with higher braking performance requirements.

[0024] Of course, the gear arrangement in this structure can be changed, such as the line connecting the drive motor 1 and the sun gear 5 and the center line connecting the pistons 11 can be arranged in parallel or at any other angle that does not affect the layout of the whole vehicle. The angle between the axis of the sun gear 5 and the axis of the screw drive gear 9 can be set to any angle according to the actual layout space of the whole vehicle, and is not limited to the colinear structure described in the present invention. The schematic partial top view structure with an angle of 90° and 180° is shown in the attached figure. Figure 3 The planetary gear structure can also be arranged in other stages of the entire gear train, such as the motor output side, but this structure can be used to realize the multi-piston arrangement of the electronic mechanical brake system structure.

[0025] The technical principle of the present invention is described above in combination with the specific embodiments, which are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions under the idea of ​​the present invention belong to the protection scope of the present invention. Those skilled in the art can think of other specific implementations of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A multi-piston electromechanical brake, characterized in that: It includes a motor, an output gear of the motor, an intermediate gear, a large gear, and a sun gear connected in sequence. The sun gear is connected to a planetary gear. The planetary gear is provided with a planetary carrier. The outer ring of the planetary carrier is a gear structure. The outer ring gear structure of the planetary carrier is meshed with the driving gear of the ball screw. The screw is driven to rotate through the driving gear, thereby driving the nut piston to move toward or away from the friction plate.

2. A multi-piston electromechanical brake as claimed in claim 1, characterized in that: A gear ring is arranged outside the planetary gear.

3. A multi-piston electromechanical brake as claimed in claim 2, characterized in that: A driving gear is respectively arranged on two parallel sides of the planetary carrier axis, and each of the driving gears is connected with a lead screw and a piston nut.

4. A multi-piston electromechanical brake as claimed in claim 2, characterized in that: At least one brake unit is arranged outside the driving gear, and each brake unit includes an idler gear, a driving gear, a lead screw and a nut piston that are meshed in sequence.

5. A multi-piston electromechanical brake as claimed in claim 4, characterized in that: The connection line between the motor and the sun gear and the connection line between the centers of the nut pistons are arranged in parallel or at any other angle that does not affect the layout of the entire vehicle.

6. A multi-piston electromechanical brake as claimed in claim 5, characterized in that: The angle of the connection between the sun gear axis and the drive gear axis of the lead screw is arranged according to the actual space of the vehicle and the relative position of the friction plate.

7. A vehicle, characterized in that: It comprises a multi-piston electromechanical brake as described in any one of claims 1-6.

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