Piston guiding and supporting structure applied to electronic mechanical brake

Abstract

The utility model relates to the technical field of braking systems, in particular to a piston guiding and supporting structure applied to an electronic mechanical brake. A piston guiding and supporting structure applied to an electronic mechanical brake comprises a caliper shell and a ball screw piston assembly, and is characterized in that the caliper shell is arranged on the outer side of the ball screw piston assembly, and a guiding and supporting structure is arranged between the ball screw piston assembly and the caliper shell; the guide supporting structure comprises a rubber sealing part and a supporting framework part, the supporting framework part is arranged on the outer side of the ball screw piston assembly in a sleeving mode, and the rubber sealing part wraps the outer side of the supporting framework part. Compared with the prior art, the piston guiding and supporting structure applied to the electronic mechanical brake is provided, by means of the piston guiding and supporting structure, the piston cannot make direct contact with a caliper cylinder hole of a caliper, is not affected by radial deflection and can work normally, the braking efficiency is kept, and meanwhile the sealing performance is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of braking systems, and specifically relates to a piston guiding and supporting structure applied to an electromechanical brake. Background Art

[0002] At present, the piston of a hydraulic caliper product has only one sealing structure and no supporting structure, and it cannot be directly used as the sealing method of an electromechanical caliper. The piston of an electromechanical brake caliper (eCaliper) is driven by a rolling resistance screw rod, and the head of the piston will deflect radially under the working condition of a large clamping force. This radial deflection will lead to low braking efficiency and reduced product service life.

[0003] Therefore, it is necessary to design a supporting and guiding structure to correct the radial deviation of the piston, and at the same time meet the sealing function and a high fatigue life. This guiding and supporting structure is a necessary condition for ensuring the normal operation of the piston of an electromechanical caliper. Summary of the Invention

[0004] The utility model aims to overcome the deficiencies of the prior art and provides a piston guiding and supporting structure applied to an electromechanical brake, which can simultaneously meet the radial support and guiding functions of the piston of an electromechanical caliper, and improve the braking efficiency and fatigue life of the electromechanical caliper.

[0005] To achieve the above object, a piston guiding and supporting structure applied to an electromechanical brake is designed, which includes a caliper housing and a ball screw piston assembly. The characteristics are as follows: a caliper housing is arranged outside the ball screw piston assembly, and a guiding and supporting structure is arranged between the ball screw piston assembly and the caliper housing; the guiding and supporting structure includes a rubber sealing part and a supporting skeleton part. The supporting skeleton part is sleeved outside the ball screw piston assembly, and the rubber sealing part is wrapped outside the supporting skeleton part.

[0006] The rubber sealing part is of an annular structure. A groove for arranging the supporting skeleton part is arranged in the middle of the inner ring of the rubber sealing part, and oil storage groove sealing structures are respectively arranged on the upper and lower sides of the groove; an outer sealing structure is arranged on the outer edge of the rubber sealing part.

[0007] The cross-section of the oil storage groove sealing structure is wavy.

[0008] The cross-section of the outer sealing structure is an irregular structure.

[0009] The supporting skeleton part is of an annular structure.

[0010] The supporting skeleton part is a metal skeleton.

[0011] The guiding and supporting structure is connected with the caliper housing by an interference fit.

[0012] Compared with the prior art, the utility model provides a piston guiding and supporting structure applied to an electro-mechanical brake. By using this structure, the piston will not directly contact the caliper cylinder hole of the caliper, is not affected by radial deflection, can work normally, and while maintaining the braking efficiency, the sealing performance is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an exploded view of the structure of the utility model.

[0014] Figure 2 It is a cross-sectional view of the structure of the utility model.

[0015] Figure 3 It is a partially enlarged schematic view of the structure of the utility model.

[0016] See Figures 1 to 3 , 1 is a caliper housing, 2 is a guiding and supporting structure, 2-1 is a rubber sealing part, 2-2 is a supporting skeleton part, 2-3 is an oil storage tank sealing structure, 2-4 is an outer sealing structure, and 3 is a ball screw piston assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following further describes the utility model with reference to the drawings.

[0018] As Figures 1 to 3 shown, a caliper housing 1 is provided outside the ball screw piston assembly 3, and a guiding and supporting structure 2 is provided between the ball screw piston assembly 3 and the caliper housing 1; the guiding and supporting structure 2 includes a rubber sealing part 2-1 and a supporting skeleton part 2-2. The supporting skeleton part 2-2 is sleeved outside the ball screw piston assembly 3, and the rubber sealing part 2-1 is wrapped outside the supporting skeleton part 2-2.

[0019] The rubber sealing part 2-1 is of an annular structure. A groove for setting the supporting skeleton part 2-2 is provided in the middle of the inner ring of the rubber sealing part 2-1, and oil storage tank sealing structures 2-3 are respectively provided on the upper and lower sides of the groove; an outer sealing structure 2-4 is provided on the outer edge of the rubber sealing part 2-1.

[0020] The cross-section of the oil storage tank sealing structure 2-3 is wavy.

[0021] The cross-section of the outer sealing structure 2-4 is an irregular structure.

[0022] The supporting skeleton part 2-2 is of an annular structure.

[0023] The supporting skeleton part 2-2 is a metal skeleton.

[0024] The guiding and supporting structure 2 is connected with the caliper housing 1 by interference fit.

[0025] The present utility model designs the support skeleton part 2-2 and the rubber seal part 2-1 into an integral rubber-coated structure, namely, the guiding and supporting structure 2; the outer side of this structure is fitted with the assembly hole of the caliper housing 1 to form a seal, and the inner side contacts the surface of the ball screw piston assembly 3 to play a role in guiding, supporting and sealing.

[0026] Both sides of the guiding and supporting structure 2 in the support skeleton part 2-2 are designed with oil storage groove sealing structures 2-3, which can store lubricating grease, reduce the piston sliding noise and improve the fatigue life; the support skeleton part 2-2 is made of bearing steel (including heat treatment), and its high-strength characteristic is used to correct the radial offset of the piston under the condition of large clamping force, so as to play a guiding role and keep the electro-mechanical caliper continuously having a high braking efficiency.

[0027] As Figure 2 shown, the inner hole of the caliper housing 1 is designed with an open step, and the new guiding and supporting structure 2 is assembled with the open step of the caliper housing 1 through interference fit.

[0028] The inner side of the guiding and supporting structure 2 is fitted with the outer wall of the ball screw piston assembly 3. The inner diameter of the support skeleton part 2-2 is designed to be smaller than the inner diameter of the caliper housing 1. During the movement of the ball screw piston assembly 3, it first contacts the support skeleton part 2-2. When the clamping force is greater than 30 kN and the piston deflects radially, the support skeleton part 2-2 supports the piston and prevents the piston from moving radially, ensuring the normal linear clamping movement of the piston.

[0029] As Figure 3 shown, both sides of the support skeleton part 2-2 are designed with oil storage groove sealing structures 2-3. Before assembly, lubricating grease is evenly applied to the inner side of the guiding and supporting structure 2, and the grease will be stored in the inner ring area. When the ball screw piston assembly 3 reciprocates, the stored grease can effectively reduce the friction coefficient of the piston mating pair and effectively ensure the normal linear movement of the piston. Therefore, the braking efficiency of the brake caliper is effectively guaranteed. At the same time, the lip design with an oil storage groove can not only form a seal but also ensure the fatigue life of the product.

[0030] The present utility model uses a new guiding and sealing structure. The piston does not directly contact the caliper cylinder hole of the caliper, is not affected by radial deflection, can work normally, and while maintaining the braking efficiency, ensures the sealing performance.

Claims

1. A piston guide support structure for an electromechanical brake, comprising a caliper housing, a ball screw piston assembly, and characterized in that: A caliper housing (1) is provided on the outer side of the ball screw piston assembly (3), and a guide support structure (2) is provided between the ball screw piston assembly (3) and the caliper housing (1); the guide support structure (2) comprises a rubber sealing portion (2-1) and a support frame portion (2-2); the support frame portion (2-2) is sleeved on the outer side of the ball screw piston assembly (3), and the outer side of the support frame portion (2-2) wraps around the rubber sealing portion (2-1).

2. The piston guide support structure for an electromechanical brake according to claim 1, characterized in that: The rubber sealing part (2-1) is a circular ring structure. A groove for arranging the supporting skeleton part (2-2) is provided in the middle of the inner ring of the rubber sealing part (2-1). Oil storage tank sealing structures (2-3) are provided on the upper and lower sides of the groove respectively. An outer sealing structure (2-4) is provided on the outer edge of the rubber sealing part (2-1).

3. The piston guide support structure for an electromechanical brake according to claim 2, characterized in that: The cross section of the oil storage tank sealing structure (2-3) is wavy.

4. The piston guide support structure for an electromechanical brake according to claim 2, characterized in that: The cross section of the outer sealing structure (2-4) is an irregular structure.

5. The piston guide support structure for an electromechanical brake according to claim 1, characterized in that: The supporting frame part (2-2) is a circular ring structure.

6. A piston guide support structure for an electromechanical brake according to claim 1 or 2, characterized in that: The supporting frame part (2-2) is a metal frame.

7. The piston guide support structure for an electromechanical brake according to claim 1, characterized in that: The guide support structure (2) and the caliper housing (1) are connected by an interference fit.

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