Piston assembly for hydraulic brake-by-wire system
Through the piston inner sleeve piston structure and sealed leather bowl, the design of manpower brake and line control is solved, and the structural complexity and easy wear of the piston assembly of the hydraulic line control system is achieved, achieving the effect of easy production and extended service life.
Patent Information
- Application Number
- CN202422657326.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The piston assembly of the existing hydraulic line control system is complex in structure, and the mechanical design leads to high manufacturing costs and easy wear, affecting service life.
The piston inner sleeve piston structure is adopted, and the piston movements of human brakes and line-controlled are divided using a sealed leather bowl, and the piston chamber is separated by a sealed leather bowl to improve sealing and reduce wear.
It achieves simple structure, not easy to wear, easy to produce and process, and extends the service life of the piston assembly.
Smart Images
Figure CN223116335U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic braking, in particular to a piston assembly for a hydraulic-by-wire braking system. Background Art
[0002] A by-wire braking system is an essential product for current intelligent driving. It can ensure the safety of drivers and passengers to the greatest extent in case of emergencies. It uses an autonomous recognition method to judge sudden situations during driving. When a person is too late to brake, the by-wire system automatically starts and replaces the person to perform autonomous braking. Analyzing from the structure, a hydraulic-by-wire braking system needs to use liquid to push the piston to move, generate a force effect, and achieve the braking function. It can push the piston by stepping on the brake pedal and also release high-pressure liquid by the solenoid valve to push the piston.
[0003] Currently, domestic by-wire pistons are basically mechanical structures, and the by-wire braking function is realized by an electric drive method. Usually, gear transmission or worm and worm gear transmission is adopted, with a complex structure, high manufacturing cost, easy wear, and affecting the service life of the product.
[0004] Therefore, it is necessary to design a piston assembly for a hydraulic-by-wire braking system to overcome the above problems. Summary of the Utility Model
[0005] In order to avoid the above problems, a piston assembly for a hydraulic-by-wire braking system is provided. It adopts a piston-in-piston structure and uses a sealing cup to separate the piston actions of manual braking and by-wire braking. The structure is novel and simple, not easy to wear, and easy to produce and process.
[0006] The piston assembly for a hydraulic-by-wire braking system provided by the utility model includes: a housing, a plug, a manual piston, a by-wire piston, a manual return spring, a by-wire return spring, a spring seat, and a valve core push rod;
[0007] A human piston cavity is provided in the shell, and a human brake oil inlet, a wire control brake oil inlet and an oil return port are sequentially provided on the side wall of the shell in the length direction; a plug is provided in the human piston cavity, and a valve core push rod with one end extending into the human piston cavity is movably installed on the shell along the length direction, and the plug is respectively located at two opposite ends of the human piston cavity; the human piston is movably installed in the human piston cavity along the length direction, the human brake oil inlet is located between the plug and the human piston, a wire control piston cavity is provided in the human piston toward one end of the valve core push rod, a through groove connecting the wire control piston cavity and the wire control brake oil inlet is provided on the side wall of the human piston, the wire control piston is movably installed in the wire control piston cavity along the length direction, the wire control piston abuts on the valve core push rod, a spring seat sleeve fixed in the human piston cavity is provided on the wire control piston, a human reset spring sleeve is provided on the spring seat and one end abuts on the end of the human piston cavity, the wire control reset spring sleeve is provided on the wire control piston and is located between the spring seat and the wire control piston, and the human reset spring has a force on the spring seat and the wire control reset spring has a force on the wire control piston toward the plug respectively.
[0008] Preferably, two sets of sealing leather cups are provided between the inner wall of the manual piston cavity and the manual piston, which are respectively arranged alternately between the manual brake oil inlet, the wire control brake oil inlet and the oil return port, and one set of sealing leather cups is provided between the inner wall of the wire control piston cavity and the wire control piston.
[0009] Preferably, the sealing cup is Y-shaped.
[0010] Preferably, two sealing leather cups are provided in each group, and their forks are arranged back to back.
[0011] Preferably, the inner wall of the manual piston cavity and the inner wall of the wire-controlled piston cavity are both provided with a sealing groove for accommodating a sealing leather cup.
[0012] Preferably, the plug is sealed and installed in the manual piston chamber through a sealing ring.
[0013] Preferably, the plug is fixed in the manpower piston chamber by a wire retaining spring.
[0014] Preferably, an opening at one end of the wire-controlled piston facing away from the valve core push rod is provided with a slot.
[0015] Preferably, the inner wall of the manual piston cavity is provided with a first communicating cavity which is communicated with the manual brake oil inlet.
[0016] Preferably, the inner wall of the manual piston cavity is provided with a second connecting cavity connecting the brake-by-wire oil inlet and the through groove.
[0017] Compared with the prior art, the utility model has the following beneficial effects: the piston assembly adopts a piston-in-piston structure, and uses a sealing leather cup to divide the piston actions of manual braking and wire-controlled braking. The structure is novel and simple, not easy to wear, and easy to produce and process. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Schematic diagram of the structure of a piston assembly for a hydraulic wire control braking system according to a preferred embodiment of the present invention;
[0019] Explanation of the reference numerals in the attached drawings:
[0020] 1. Housing, 11. Manual piston chamber, 12. Manual braking oil inlet, 13. Wire control braking oil inlet, 14. Oil return port, 15. First communication chamber, 16. Second communication chamber,
[0021] 2. Plug, 21. Sealing ring, 22. Wire spring clip,
[0022] 3. Manual piston, 31. Wire control piston chamber, 32. Through groove,
[0023] 4. Wire control piston, 41. Groove,
[0024] 5. Manual return spring,
[0025] 6. Wire control return spring,
[0026] 7. Spring seat,
[0027] 8. Spool push rod,
[0028] 9. Sealing leather cup, 91. Sealing groove. Detailed implementation manners
[0029] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0030] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0031] As Figure 1As shown in the figure, a piston assembly for a hydraulic line control braking system provided in this embodiment includes: a housing 1, a plug 2, a manual piston 3, a wire control piston 4, a manual return spring 5, a wire control return spring 6, a spring seat 7, and a valve core push rod 8.
[0032] Among them, a manual piston cavity 11 is provided inside the housing 1. A manual braking oil inlet 12, a wire control braking oil inlet 13, and an oil return port 14 are sequentially provided on the side wall of the housing 1 from right to left. The plug 2 is hermetically installed in the manual piston cavity 11 through an O-ring 21 to ensure the sealing effect. At the same time, the plug 2 is limited and fixed in the manual piston cavity 11 through a wire snap ring 22. At the same time, the valve core push rod 8 is installed at the left end of the housing 1 so as to be movable left and right, and the right end of the valve core push rod 8 extends into the manual piston cavity 11.
[0033] At the same time, the manual piston 3 is installed in the manual piston cavity 11 so as to move in the left and right directions. The manual braking oil inlet 12 is located between the plug 2 and the manual piston 3, and a first communication cavity 15 communicating with the manual braking oil inlet 12 is provided on the inner wall of the manual piston cavity 11. A wire control piston cavity 31 is provided at the left end opening of the manual piston 3. A through groove 32 communicating the wire control piston cavity 31 and the wire control braking oil inlet 13 is provided on the side wall of the manual piston 3. A second communication cavity 16 communicating the wire control braking oil inlet 13 and the through groove 32 is provided on the inner wall of the manual piston cavity 11. And in order to accommodate more hydraulic oil for wire control braking, a notch 41 is provided at the right end opening of the wire control piston 4.
[0034] The wire control piston 4 is installed in the wire control piston cavity 31 so as to move in the left and right directions. The wire control piston 4 abuts against the right end of the valve core push rod 8. The spring seat 7 fixed in the manual piston cavity 11 is sleeved on the wire control piston 4. The manual return spring 5 is sleeved on the spring seat 7 and one end abuts against the end of the manual piston cavity 11. The wire control return spring 6 is sleeved on the wire control piston 4 and is located between the spring seat 7 and the wire control piston 4. The manual return spring 5 has a force acting on the spring seat 7 towards the plug 2, and the wire control return spring 6 has a force acting on the wire control piston 4 towards the plug 2.
[0035] As Figure 1 shown, for better sealing performance, two groups of sealing leather cups 9 are provided between the inner wall of the manual piston cavity 11 and the manual piston 3, and are respectively staggered between the manual braking oil inlet 12, the wire control braking oil inlet 13, and the oil return port 14. One group of sealing leather cups 9 is provided between the inner wall of the wire control piston cavity 31 and the wire control piston 4. The sealing leather cups 9 are of Y type, two sealing leather cups 9 are provided in each group, and their forks are arranged back to back. And sealing grooves 91 for accommodating the sealing leather cups 9 are provided on the inner walls of both the manual piston cavity 11 and the wire control piston cavity 31. The braking closed area is separated by the sealing leather cups 9, and the components are not easily worn and are simple and easy to obtain.
[0036] Actual operation process:
[0037] When braking with the manual piston 3, the high-pressure hydraulic fluid enters the manual piston chamber 11 from the manual braking oil inlet 12 through the first communication chamber 15, pushing the manual piston 3 to move leftward. The manual piston 3 overcomes the resistance of the manual return spring 5, causing the left end of the by-wire piston 4 to push the valve core push rod 8 to move and output a thrust F to achieve the braking function. At this time, the Y-shaped sealing leather cup 9 and the O-ring 21 in the by-wire piston 4 chamber 31 form a sealed area for the manual piston 3, converting the hydraulic fluid into thrust. When the braking is released, the manual piston 3 returns to its initial position under the action of the manual return spring 5, and the liquid in the valve core push rod 8 returns to the oil pot through the oil return port 14.
[0038] When braking with the by-wire piston 4, the manual piston 3 remains stationary. The high-pressure hydraulic fluid enters the by-wire piston 4 chamber 31 from the by-wire braking oil inlet 13 through the second communication chamber 16 and the through groove 32, pushing the by-wire piston 4 to move leftward. The by-wire piston 4 overcomes the resistance of the by-wire return spring 6, causing the left end of the by-wire piston 4 to push the valve core push rod 8 to move and output a thrust F to achieve the braking function. At this time, the Y-shaped sealing leather cup 9 in the by-wire piston 4 chamber 31 and the Y-shaped sealing leather cup 9 in the manual piston chamber 11 form a sealed area for the by-wire piston 4, converting the hydraulic fluid into thrust. When the braking is released, the by-wire piston 4 returns to its initial position under the action of the by-wire return spring 6, and the liquid in the valve core push rod 8 returns to the oil pot through the oil return port 14.
[0039] This piston assembly adopts a piston-in-piston structure and uses the sealing leather cup 9 to separate the piston actions of manual braking and by-wire braking. The structure is novel and simple, not easily worn, and easy to produce and process.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A piston assembly for a hydraulic wire control braking system, characterized in that, include: Housing, plug, manual piston, wire-controlled piston, manual return spring, wire-controlled return spring, spring seat and valve core push rod; A human piston cavity is provided in the shell, and a human brake oil inlet, a wire control brake oil inlet and an oil return port are sequentially provided on the side wall of the shell in the length direction; a plug is provided in the human piston cavity, and a valve core push rod with one end extending into the human piston cavity is movably installed on the shell along the length direction, and the plug is respectively located at two opposite ends of the human piston cavity; the human piston is movably installed in the human piston cavity along the length direction, the human brake oil inlet is located between the plug and the human piston, a wire control piston cavity is provided in the human piston toward one end of the valve core push rod, a through groove connecting the wire control piston cavity and the wire control brake oil inlet is provided on the side wall of the human piston, the wire control piston is movably installed in the wire control piston cavity along the length direction, the wire control piston abuts on the valve core push rod, a spring seat sleeve fixed in the human piston cavity is provided on the wire control piston, a human reset spring sleeve is provided on the spring seat and one end abuts on the end of the human piston cavity, the wire control reset spring sleeve is provided on the wire control piston and is located between the spring seat and the wire control piston, and the human reset spring has a force on the spring seat and the wire control reset spring has a force on the wire control piston toward the plug respectively.
2. The piston assembly for a hydraulic line control braking system as described in claim 1, characterized in that: Two sets of sealing leather cups are arranged between the inner wall of the manual piston cavity and the manual piston, which are staggered between the manual brake oil inlet, the wire control brake oil inlet and the oil return port, and one set of sealing leather cups is arranged between the inner wall of the wire control piston cavity and the wire control piston.
3. The piston assembly for a hydraulically actuated braking system according to claim 2, characterized in that: The sealing cup is Y-shaped.
4. The piston assembly for a hydraulically actuated braking system as described in claim 2, characterized in that: Each group is provided with two sealing leather cups, and their forks are arranged back to back.
5. The piston assembly for a hydraulic line control braking system as described in claim 2, characterized in that: The inner walls of the manual piston cavity and the wire-controlled piston cavity are both provided with sealing grooves for accommodating sealing leather cups.
6. The piston assembly for a hydraulic line control braking system as described in claim 1, characterized in that: The plug is sealed and installed in the manpower piston cavity through a sealing ring.
7. The piston assembly for a hydraulic line control braking system as described in claim 1, characterized in that: The plug is fixed in the manpower piston cavity by a steel wire retaining spring.
8. The piston assembly for a hydraulic line control braking system as described in claim 1, wherein: An opening at one end of the wire-controlled piston away from the valve core push rod is provided with a slot.
9. The piston assembly for a hydraulic line control braking system as described in claim 1, characterized in that: The inner wall of the manual piston cavity is provided with a first communicating cavity communicated with the manual brake oil inlet.
10. The piston assembly for a hydraulic line control braking system as described in claim 1, characterized in that: The inner wall of the manual piston cavity is provided with a second communicating cavity communicating with the brake-by-wire oil inlet and the through groove.