Electronic mechanical braking system structure and vehicle
By combining the nut with the planetary carrier and setting a clamp body on the outside of the nut, the problem of limited stroke and difficult clamping force in the existing electronic mechanical braking system is solved, and greater clamping force and more precise clamping force release control is achieved.
Patent Information
- Application Number
- CN202421660409.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-15
AI Technical Summary
When the existing electronic mechanical braking system uses nut circulation, the stroke is limited, the clamping force is difficult to achieve under a limited compression area, and the clamping force release control is inaccurate.
An electronic mechanical braking system structure is designed to increase the stroke and load carrying capacity of the screw by combining the nut with the planet carrier and installing a clamp body on the outside of the nut to prevent the screw from rotating circumferentially, thereby increasing the stroke and load-bearing capacity of the screw.
It achieves greater clamping force under the same compression area conditions, and increases the stroke of the lead screw, which facilitates the adjustment of friction plate wear, and has a more accurate clamping force release process and better control effect.
Smart Images
Figure CN222820056U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicle electronic mechanical braking, in particular to an electronic mechanical braking device structure and a vehicle. Background Art
[0002] Electro-Mechanical Braking System (EMB) refers to a system that uses a motor to drive a deceleration mechanism, converts rotational motion into linear motion through a motion conversion mechanism, and pushes the friction plate to clamp the brake disc to achieve vehicle braking.
[0003] As attached Figure 1 As shown, in the existing electronic mechanical braking related technologies, when the ball screw structure is used, the nut 11 is generally used as a piston. When the motor 1 outputs torque, the planetary carrier 8 at the output end of the reducer composed of the motor gear 2, the intermediate gear 3, the large gear 4, the sun gear 5, the planetary gear 6 and the ring gear 7 drives the screw 10 to rotate. The nut is restricted by the anti-rotation device in the circumferential direction, and the nut can move axially forward and backward to tighten and relax the friction plate.
[0004] This structure has more engineering experience and is relatively easy to manufacture. However, it also has some shortcomings. For example, when using the nut cycle, the stroke will be greatly limited under the condition of ensuring sufficient load capacity; secondly, when the area of the clamping friction plate is certain, the bearing capacity of the screw is limited due to the limitation of the outer diameter of the nut, and a greater clamping force cannot be achieved under the premise of a limited clamping area. Finally, the current mainstream structure is difficult to accurately control in terms of the control of the screw retraction process, that is, the clamping force release process, due to the inherent reasons of the system structure. Utility Model Content
[0005] In view of the deficiencies in the prior art, the utility model provides an electronic mechanical brake system structure, which changes the structure of the EMB ball screw application so that the new structure has a larger stroke and a larger load-bearing capacity than the traditional nut circulation structure.
[0006] To achieve the above purpose, the utility model provides the following technical solutions:
[0007] An electronic mechanical brake system structure includes a motor, the gears of the motor sequentially drive the intermediate gear, the secondary reduction gear and the sun gear to rotate, the sun gear is connected to a planetary gear, the gear shaft of the planetary gear is connected to the end face of a nut, the nut and the planet carrier are combined into one part, a screw is arranged inside the nut, and the screw is arranged opposite to a friction plate.
[0008] As a further solution of the utility model, a clamp body is arranged on the outer side of the nut.
[0009] As a further solution of the utility model, the pliers body includes a flat key, a spline or a plurality of keyways / flat keyways; or the screw rod and the pliers body are matched in a non-circular manner to prevent the screw rod from rotating circumferentially.
[0010] As a further solution of the utility model, a flange is further provided at the end of the screw rod.
[0011] As a further solution of the utility model, a gear ring is arranged on the outer side of the planetary gear.
[0012] As a further solution of the utility model, a thrust bearing is provided at one end of the nut close to the planetary gear. The utility model also provides a vehicle including the above-mentioned electronic mechanical braking system structure.
[0013] The utility model has the following beneficial effects:
[0014] The utility model provides an electronic mechanical brake system structure, which realizes a new application of the ball screw structure in the electronic mechanical brake device. Under the same clamping area condition, a greater clamping force can be achieved. At the same time, under the premise of opening holes at both ends of the nut, a larger screw stroke can be achieved, and the wear of the friction plate can be effectively adjusted, and the ball screw stroke will not be insufficient due to the wear of the friction plate. In addition, since the forward and reverse efficiencies of the ball screw are different, this structure is more beneficial to the clamping force release process, that is, when the output torque drop of the reducer is less than that of the original structure, the screw can be retracted. It is more conducive to the control of the clamping force release of the electronic mechanical brake device.
[0015] In addition, since the nut and the planet carrier are combined into one part, the number of system parts is reduced, and the cost and assembly are also optimized.
[0016] In order to more clearly illustrate the structural features and functions 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
[0017] Figure 1 It is a structural schematic diagram of the prior art mentioned in the utility model;
[0018] Figure 2 This is a structural schematic diagram of an electronic mechanical braking system structure mentioned in the utility model.
[0019] Figure 3 It is a schematic diagram of the connection between the screw rod and the pliers body in the utility model. DETAILED DESCRIPTION
[0020] The present invention will be further described 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 of the embodiments.
[0021] Reference Figure 1 As shown, in the existing electronic mechanical brake related technologies, when the ball screw structure is used, the nut 11 is generally used as a piston. When the motor 1 outputs torque, the planetary carrier 8 at the output end of the reducer composed of the motor gear 2, the intermediate gear 3, the large gear (secondary reduction gear) 4, the sun gear 5, the planetary gear 6 and the ring gear 7 drives the screw 10 to rotate. The nut is restricted by the anti-rotation device in the circumferential direction, and the nut can move forward and backward in the axial direction to tighten and relax the friction plate. In the prior art, when the nut is used for circulation, the stroke will be greatly restricted under the condition of ensuring sufficient load capacity and considering the risk of ball falling off; secondly, when the area of the friction plate is fixed, due to the limitation of the outer diameter of the nut, the bearing capacity of the screw is limited, and it is difficult to achieve a larger clamping force under the premise of a limited clamping area.
[0022] Reference Figure 2 As shown, an electronic mechanical braking system structure of the utility model includes a motor 1, the gear 2 of the motor drives the intermediate gear 3, the secondary reduction gear 4 and the sun gear 5 to rotate in sequence, the sun gear 5 is connected to a planetary gear 6, the gear shaft of the planetary gear 6 is connected to a nut 11, a screw rod 10 is arranged on the inner side of the nut 11, and the screw rod 10 is arranged opposite to the friction plate 12.
[0023] The utility model makes a new design for the ball screw structure in the electronic mechanical brake device, that is, the screw is used as the part that finally contacts the friction plate, and the nut is connected to the output end of the reducer. The motor outputs torque, which drives the nut to rotate after passing through the reducer. Due to the circumferential anti-rotation restriction, the screw can achieve axial forward and backward movement, so that the friction plate can be clamped and released.
[0024] As a further improvement, a clamp body 15 is provided on the outside of the nut 11. By providing the clamp body 15, an anti-rotation feature can be achieved, which can be a flat key, a spline or a plurality of keyways / flat keys, etc. It can also be a screw end shape of various non-circular shapes.
[0025] As a further improvement, a flange is also provided at the end of the screw rod 10, so that when the screw rod 10 retreats, it can only retreat to a limited position at the end face of the nut 11, and the screw rod 10 will not exit the nut raceway range and cause the beads to fall off.
[0026] As a further improvement, a gear ring 7 is provided on the outer side of the planetary gear 6, and a thrust bearing 9 is provided on the end of the nut 11 close to the planetary gear 6. Through the above structure, the motor 1 finally drives the nut 11 to rotate, and the nut 11 is restricted in the axial direction by the thrust bearing 9 and the housing or the caliper body and cannot move, so it drives the screw rod to move in the axial direction to achieve the purpose of pressing the friction plate. When the friction plate pressure needs to be released, it can be achieved by reversing the motor.
[0027] Reference Figure 2-Figure 3 As shown, when the motor 1 outputs torque, the motor gear 2 drives the intermediate gear 3, the secondary reduction gear 4 and the sun gear 5 connected thereto to rotate, and then the sun gear 5 drives the planetary gear 6 to rotate in the gear ring. The gear shaft of the planetary gear 6 is directly connected to the nut 11, eliminating the planetary carrier and reducing the number of system parts. The screw rod 10 has an anti-rotation feature between the side close to the friction plate 12 and the caliper body 15. The feature can be a flat key, a spline or multiple keyways / flat keys, or a non-circular screw rod end and a corresponding caliper body hole, so that the screw rod 10 can only move axially to prevent the screw rod 10 from rotating. In addition, there is a flange at the end of the screw rod 10, which can make the screw rod 10 retreat to a limited position at the end face of the nut 11 when the clamping force is released and retreated, and the screw rod 10 will not retreat from the range of the nut steel ball, resulting in ball loss. Figure 2 The structure is only a schematic diagram, and other similar structures can also achieve the same purpose.
[0028] Through the above structure, the motor 1 finally drives the nut 11 to rotate, and the nut 11 is restricted by the thrust bearing 9 and the housing or the caliper body and cannot move axially, so it drives the screw rod 10 to move axially to achieve the purpose of pressing the friction plate 12. When the friction plate pressure needs to be released, it can be achieved by reversing the motor.
[0029] The utility model drives the screw rod through a motor to compress and release the friction plate. When the area of the compressed friction plate is constant, since the diameter of the nut is larger than the screw rod, the number of steel balls or the nominal diameter of the raceway of this structure is larger than the traditional solution for the same steel ball specifications, and can withstand greater braking force. And the hole structure at both ends of this nut allows the screw rod to be longer, so that the entire mechanism has a longer stroke. In addition, in this structure, the nut and the planetary carrier are integrated into one, the planetary carrier is eliminated, and the system structure is simpler and more compact. And because of the difference in the forward and reverse efficiencies of the ball screw, when this structure releases the clamping force, the friction plate pressure pushes the screw rod to make the nut rotate more efficiently than the traditional structure, so the release will be earlier, which is more conducive to the control and realization of the electronic mechanical braking device.
[0030] The technical principle of the utility model is described above in combination with the specific embodiments, which are only the preferred implementation methods of the utility model. The protection scope of the utility model is not limited to the above embodiments, and all technical solutions under the idea of the utility model belong to the protection scope of the utility model. Those skilled in the art can think of other specific implementation methods of the utility model without creative labor, and these methods will fall within the protection scope of the utility model.
Claims
1. An electromechanical brake system structure, characterized in that: It includes a motor, the gears of which drive the intermediate gear, the secondary reduction gear and the sun gear to rotate in sequence, the sun gear is connected to a planetary gear, the gear shaft of the planetary gear is connected to the end face of a nut, the nut and the planetary carrier are combined into one part, a screw is arranged on the inner side of the nut, and the screw is arranged opposite to the friction plate.
2. An electromechanical brake system structure as claimed in claim 1, characterized in that: A clamp body is arranged on the outer side of the nut.
3. An electromechanical brake system structure as claimed in claim 2, characterized in that: The pliers body comprises a flat key, a spline or a plurality of keyways / flat keyways; or the screw rod and the pliers body are matched in a non-circular manner to prevent the screw rod from rotating circumferentially.
4. An electromechanical brake system structure as claimed in claim 3, characterized in that: The end of the screw rod is also provided with a flange.
5. An electromechanical brake system structure as claimed in claim 4, characterized in that: A gear ring is arranged outside the planetary gear.
6. An electromechanical brake system structure as claimed in claim 5, characterized in that: A thrust bearing is arranged at one end of the nut close to the planetary gear.
7. A vehicle, characterized in that: It comprises the electronic mechanical braking system structure as described in any one of claims 1-6.