CN219299831U - Piston assembly for hydraulic braking system - Google Patents
Piston assembly for hydraulic braking system Download PDFInfo
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- CN219299831U CN219299831U CN202320139219.4U CN202320139219U CN219299831U CN 219299831 U CN219299831 U CN 219299831U CN 202320139219 U CN202320139219 U CN 202320139219U CN 219299831 U CN219299831 U CN 219299831U
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- 230000000670 limiting effect Effects 0.000 claims abstract description 42
- 239000003292 glue Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 6
- 230000033001 locomotion Effects 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 description 1
- 240000006413 Prunus persica var. persica Species 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
The utility model relates to a piston assembly structure. The piston assembly for the hydraulic braking system comprises a screw rod assembly and a bearing assembly, wherein the screw rod assembly comprises a screw rod, a screw rod nut is sleeved outside the screw rod, and the screw rod nut and the piston synchronously move; the bearing assembly comprises a bearing inner ring and a bearing outer ring, and a limiting structure is arranged between the bearing inner ring and the screw nut; the screw rod is fixed with the bearing inner ring, and the bearing inner ring is driven to rotate by an external structure. The piston component for the hydraulic braking system is simple in structure, low in positioning and assembling difficulty and low in production and installation cost; the piston assembly solves the technical problems of complex structure, high installation difficulty and high installation and production cost of the piston assembly in the prior art.
Description
Technical Field
The utility model relates to a piston assembly structure, in particular to a piston assembly for an electronic hydraulic brake system.
Background
The EHB system is also called an automobile electronic hydraulic brake system and is a core function in a drive-by-wire chassis system. The control unit and the actuator are arranged in a centralized manner, brake fluid is used as a power transmission medium, and a hydraulic backup system, also called a centralized type and wet type braking system, is developed relatively well.
Ball screw bearings are an important sub-assembly in EHB systems. Which is capable of converting rotational motion into linear motion. Typically, the ball screw bearing is connected to the piston by an interference fit connection. Meanwhile, a limiting part is specially designed for limiting the ball screw bearing pair.
The existing ball screw bearing device comprises a piston, a screw assembly and a bearing. The screw rod and the limiter are connected in an anti-torsion way through an interference or spline structure, and meanwhile, the screw rod and the piston are connected in an anti-torsion way through the interference or spline structure. The screw and the screw nut are connected through the screw ball to convert the rotation motion of the screw nut into the axial motion of the screw. The cylindrical pin at the other end of the screw nut is provided with a planetary gear, and the planetary gear is connected with a motor through a planetary gear train and simultaneously transmits rotary motion. The peripheral bearing is connected with the mounting seat and supports the whole device.
In the prior art, since the stopper is required to be connected with the screw rod in a torsion-resistant way through a spline, the piston also needs to be connected with the screw rod in an interference way through the spline. This places high demands on the processing of the spline. Otherwise the piston and the screw would risk slipping. Meanwhile, the assembly of the screw rod and the piston is required to be aligned with the spline, and meanwhile, the spline has interference, so that the blind assembly has certain difficulty. Therefore, the existing scheme has higher processing difficulty and assembly difficulty.
Disclosure of Invention
The piston component for the hydraulic braking system is simple in structure, low in positioning and assembling difficulty and low in production and installation cost; the piston assembly solves the technical problems of complex structure, high installation difficulty and high installation and production cost of the piston assembly in the prior art.
The technical problems of the utility model are solved by the following technical scheme: the piston assembly for the hydraulic braking system comprises a screw rod assembly and a bearing assembly, wherein the screw rod assembly comprises a screw rod, a screw rod nut is sleeved outside the screw rod, and the screw rod nut and the piston synchronously move; the bearing assembly comprises a bearing inner ring and a bearing outer ring, and a limiting structure is arranged between the bearing inner ring and the screw nut; the screw rod is fixed with the bearing inner ring, and the bearing inner ring is driven to rotate by an external structure. The screw rod is fixed on the bearing inner ring, the bearing inner ring is connected with the planetary gear train, namely, the screw rod is driven to rotate by the planetary gear train, the screw rod rotates to drive the screw rod nut to axially move, and the screw rod nut and the piston are together, so that the axial movement of the piston is driven. The lead screw is fixed with the bearing inner ring, and the piston can not be worn with the end face of the bearing inner ring due to excessive movement when moving axially through the limiting structure, so that the movement performance and the service life of the piston assembly are improved. The screw rod and the bearing inner ring are fixed, the bearing inner ring is conveniently connected with an external structure, the bearing inner ring is driven by the planetary gear train, and the screw rod nut and the piston are synchronous, so that a spline structure is not needed, the positioning is convenient, the convenience of assembly is improved, the processing difficulty is reduced, and the production cost is reduced.
Preferably, the screw nut and the piston are integrally formed, and a screw nut section is integrally formed below the inner wall of the piston and is matched with the screw. The inner wall of one end of the piston is thicker, and threads are formed on the inner wall, so that the screw nut is formed. The screw nut and the piston are integrally formed, and the structure is simple.
More preferably, the limiting structure comprises a convex column which is arranged on the end face of the piston and protrudes outwards, a limiting pin hole is formed in the bearing inner ring, and a limiting pin is in interference fit in the limiting pin hole. The distance between the limiting pin and the limiting bulge is the same as the distance between the limiting pin and the limiting bulge from the center, namely, when the piston rotates, the limiting pin and the limiting bulge on the bottom surface of the piston can touch in the circumferential direction, so that the limiting effect is achieved. The limiting pin is a standard component, and is simple to manufacture and low in cost.
As another preferable mode, the screw nut is in interference fit with the piston, and glue is coated between the screw nut and the piston. The split type structure is convenient to manufacture, and the split type structure is fixed with the split type structure through interference and glue.
More preferably, the limiting structure comprises a convex column which is arranged on the end face of the screw nut and protrudes outwards, a limiting pin hole is formed in the bearing inner ring, and a limiting pin is in interference fit with the limiting pin hole. The distance between the limiting pin and the limiting bulge is the same as the distance between the limiting pin and the limiting bulge from the center, namely, when the piston rotates, the limiting pin and the limiting bulge on the bottom surface of the piston can touch in the circumferential direction, so that the limiting effect is achieved. The limiting pin is a standard component, and is simple to manufacture and low in cost.
Preferably, the screw rod is in interference fit with the bearing inner ring. Ensuring the synchronous movement of the two.
Preferably, the bearing inner ring is provided with a planetary pin hole, a planetary pin is in interference fit in the planetary pin hole, and the planetary wheel is arranged on the planetary pin.
Preferably, one end of the piston is closed, the other end of the piston is opened towards the bearing, and the screw rod is positioned in a cavity in the piston.
Preferably, a screw ball and a reverser are arranged between the screw nut and the screw, and the reverser is arranged on the screw nut.
Accordingly, the piston assembly for a hydraulic brake system of the present utility model has the following advantages:
1. the limiting structure adopts a limiting pin structure, and the standard piece cylindrical pin is used for replacing the original limiting sleeve part with special design, so that the cost is reduced.
2. After the independent limiting sleeve part is not arranged, spline structures are not required to be designed on the screw rod and the piston cylinder, so that the processing and manufacturing cost is reduced.
3. The screw rod is fixed with the bearing inner ring, and the screw rod and the bearing inner ring synchronously move, so that the structure is simple, and the screw rod transmission effect is good.
Drawings
Fig. 1 is a perspective view of a piston assembly for a hydraulic brake system according to the present utility model.
Fig. 2 is a cross-sectional view of example 1.
Fig. 3 is a schematic illustration of the piston removed in example 1.
Fig. 4 is a perspective view of the piston.
Fig. 5 is an internal cross-sectional view of example 2.
Fig. 6 is a schematic diagram of example 2 with the piston removed.
Detailed Description
The technical scheme of the utility model is further specifically described below through examples and with reference to the accompanying drawings.
Example 1:
as shown in fig. 1 and 2 and 3 and 4, a piston assembly and a screw assembly for a hydraulic brake system, the screw assembly including a screw ball 8 and a screw 5. The piston 1 is sleeved outside the screw rod 5, one end of the piston 1 is closed, the other end of the piston 1 is opened towards the bearing assembly, and the screw rod 5 is positioned in a cavity in the piston 1. The inner wall of the piston 1 is thicker on the side facing the bearing and is formed with a raceway of internal thread formation. The section of the roller path is shaped like a peach which is formed by staggered semi-circular arcs with the same diameter. The threaded part of the piston 1 is provided with 4U-shaped grooves uniformly distributed along the circumference along the radial direction and the axial direction along the extending direction of the threaded roller path. Every U-shaped groove is separated by 1.25 times of pitch in the axial direction and is separated by 90 degrees in the circumferential direction. A reverser for returning the screw ball 8 is arranged in the U-shaped groove. The reverser adopts internal circulation, and the material is metal powder metallurgy material. The outer circle of the screw rod 5 is provided with a thread raceway corresponding to the piston 1. The lead screw 5 is arranged coaxially with the piston 1. A screw ball 8 is arranged between the screw 5 and the piston 1. The screw balls 8 rotate in the thread raceways between the piston 1, the reverser and the screw 5 while being enveloped by the thread raceways between the piston 1, the reverser and the screw 5. The threaded section of the piston acts as a screw nut 6, cooperating with the screw 5.
The bearing assembly is installed at one end of the screw rod 5 and comprises a bearing inner ring 4, balls and a bearing outer ring 2, a screw rod hole is formed in the bearing inner ring 4, the screw rod 5 is in interference fit with the bearing inner ring 4, and sealing glue is coated between the screw rod 5 and the bearing inner ring 4.
An outwardly projecting projection 9 is formed on the side end face of the piston 1. The bearing inner ring 4 is provided with a limit pin hole, the limit pin 7 is in interference fit in the limit pin hole, the bearing inner ring 4 rotates along with the rotation of the screw rod, when the limit pin 7 and the convex column 9 are in contact, the rotation of the bearing inner ring 4 is limited, the distance between the bearing inner ring 4 and the end face of the piston 1 is limited, and the friction between the bearing inner ring 4 and the piston 1 is prevented from being triggered.
The planetary pin holes are simultaneously formed in the bearing inner ring 4, planetary pins 3 are in interference fit in the planetary pin holes, the planetary pins 3 protrude to the outside of the bearing inner ring and are connected with a planetary gear train, and the number of the planetary pins 3 is 3 or 4. Through the connection of the planet pins, the planetary gear train drives the bearing inner ring 4 to rotate, so that the screw rod 5 is driven to rotate.
Example 2:
as shown in fig. 5 and 6, unlike in embodiment 1, a screw nut 6 is externally screwed to the screw 5, a piston 1 is arranged outside the screw nut 6, the screw nut 6 is in interference fit with the piston 1, and glue is coated between the screw nut 6 and the piston 1 to ensure that the screw nut 6 and the piston 1 are fixed together.
The specific embodiments described herein are merely illustrative of the principles of the present utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.
Claims (9)
1. The utility model provides a piston assembly for hydraulic braking system, includes lead screw assembly, bearing assembly, its characterized in that: the screw rod assembly comprises a screw rod, a screw rod nut is sleeved outside the screw rod, and the screw rod nut and the piston synchronously move; the bearing assembly comprises a bearing inner ring and a bearing outer ring, and a limiting structure is arranged between the bearing inner ring and the screw nut; the screw rod is fixed with the bearing inner ring, and the bearing inner ring is driven to rotate by an external structure.
2. A piston assembly for a hydraulic brake system according to claim 1, wherein: the screw nut and the piston are integrally formed, a screw nut section is integrally formed below the inner wall of the piston, and the screw nut section is matched with the screw.
3. A piston assembly for a hydraulic brake system according to claim 2, wherein: the limiting structure comprises a convex column which is arranged on the end face of the piston and protrudes outwards, a limiting pin hole is formed in the bearing inner ring, and a limiting pin is in interference fit in the limiting pin hole.
4. A piston assembly for a hydraulic brake system according to claim 1, wherein: the screw nut is in interference fit with the piston, and glue is coated between the screw nut and the piston.
5. A piston assembly for a hydraulic brake system as defined in claim 4 wherein: the limiting structure comprises a convex column which is positioned on the end face of the screw nut and protrudes outwards, a limiting pin hole is formed in the bearing inner ring, and a limiting pin is in interference fit in the limiting pin hole.
6. A piston assembly for a hydraulic brake system according to any one of claims 1 to 5, wherein: the screw rod is in interference fit with the bearing inner ring.
7. A piston assembly for a hydraulic brake system according to any one of claims 1 to 5, wherein: the bearing inner ring is provided with a planetary pin hole, a planetary pin is in interference fit in the planetary pin hole, and a planetary wheel is arranged on the planetary pin.
8. A piston assembly for a hydraulic brake system according to any one of claims 1 to 5, wherein: one end of the piston is closed, the other end of the piston is opened towards the bearing, and the screw rod is positioned in the cavity in the piston.
9. A piston assembly for a hydraulic brake system according to any one of claims 1 to 5, wherein: and a screw ball and a reverser are arranged between the screw nut and the screw, and the reverser is arranged on the screw nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320139219.4U CN219299831U (en) | 2023-02-07 | 2023-02-07 | Piston assembly for hydraulic braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320139219.4U CN219299831U (en) | 2023-02-07 | 2023-02-07 | Piston assembly for hydraulic braking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219299831U true CN219299831U (en) | 2023-07-04 |
Family
ID=86949495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320139219.4U Active CN219299831U (en) | 2023-02-07 | 2023-02-07 | Piston assembly for hydraulic braking system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219299831U (en) |
-
2023
- 2023-02-07 CN CN202320139219.4U patent/CN219299831U/en active Active
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Address after: 335200 Glasses Industrial Park, Yujiang District, Yingtan City, Jiangxi Province Patentee after: Jiangxi Walder Precision Industry Co.,Ltd. Country or region after: China Address before: 335200 Glasses Industrial Park, Yujiang District, Yingtan City, Jiangxi Province Patentee before: Jiangxi Wudecheng Technology Co.,Ltd. Country or region before: China |