Integrated hydraulic cushion structure and installation method

Abstract

The application discloses an integrated hydraulic buffering structure and a mounting method, the hydraulic buffering structure is embedded in a flow channel of a valve block of a hydraulic control unit and is connected in series with an output end of a plunger pump, and the hydraulic buffering structure comprises a containing cavity formed between a first shell and a second shell, a plurality of oil passing holes arranged on the second shell, a damper arranged on the inner side of the first shell, and a one-way valve arranged on the inner side of the second shell. When the plunger pump outputs hydraulic oil, a valve core is separated from a first steel ball, a throttle hole on the one-way valve is communicated, when the hydraulic oil pressure continuously increases, the damper is deformed through a hydraulic pressure difference, the valve core of the one-way valve is separated from the second shell, and the hydraulic oil is subjected to multi-stage buffering. The damper efficiently absorbs pulse energy, the one-way valve stabilizes a flow state and controls one-way flow, and the two cooperate to more comprehensively buffer hydraulic pulses than a split type design, the hydraulic oil flow efficiency and the flow control precision are considered, the system hydraulic control is more stable, and the noise generated by the plunger pump pressure increase is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control of vehicle stability systems, and more particularly to an integrated hydraulic buffer structure and its installation method. Background Technology

[0002] With the development of active safety technologies in automobiles, Electronic Stability Program (ESP / ESC) has become one of the core safety features of vehicles, and its hydraulic control unit (HCU) is a key actuator of the system. During the pressurization process, the piston pump in the hydraulic control unit generates strong hydraulic pulses due to the reciprocating motion of the piston pump. These pulses not only cause significant noise in the system, affecting ride comfort, but may also adversely affect the working stability of other hydraulic components inside the hydraulic control unit.

[0003] In existing technologies, multiple hydraulic buffer components, such as a throttling check valve, are typically installed at the outlet of the piston pump to buffer pressure pulses and suppress noise. However, these external hydraulic buffer components not only encroach on the internal installation space of the electronic control unit (ECU), but also, because different hydraulic buffer components are located in different flow channels, there is a certain lag in pressure regulation during hydraulic buffer control. When pressure fluctuations are large, it is difficult to adjust the pressure in a timely and accurate manner. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an integrated hydraulic buffer structure and installation method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an integrated hydraulic buffer structure, wherein the hydraulic buffer structure is embedded in the flow channel of the valve block of the hydraulic control unit and connected in series with the output end of the plunger pump, the hydraulic buffer structure comprising: First shell; The second housing forms a receiving cavity with the first housing, and the second housing is provided with a plurality of oil passage holes; A damper is provided inside the first housing, and a one-way valve is provided inside the second housing. The one-way valve includes a valve core, a first steel ball, and a spring; When the piston pump outputs hydraulic oil, it enters the receiving cavity through the oil passage, the valve core separates from the first steel ball, and the throttle orifice on the one-way valve becomes open. When the hydraulic oil pressure continues to increase, the damper deforms due to the hydraulic differential, and the valve core of the one-way valve separates from the second housing, thus providing multi-stage buffering for the hydraulic oil.

[0006] As a further description of the above technical solution: the damper includes damping rubber and a retaining ring. The outer diameter of the damping rubber matches the inner diameter of the first housing. Several annular protrusions are provided on the outer side of the damping rubber to form a gap between the damping rubber and the first housing.

[0007] As a further description of the above technical solution: the retaining ring is a stepped ring, one end of the retaining ring extends into the inner side of the first housing, is interference-fitted with the first housing and is fitted with the damping rubber, and the other end extends into the inner side of the second housing, is interference-fitted with the second housing.

[0008] As a further description of the above technical solution: the diameter of the middle part of the second housing gradually decreases to form a connected first cavity and a second cavity. Several oil passage holes are opened in the first cavity near the first housing side, and the one-way valve is arranged in the second cavity away from the first housing side.

[0009] As a further description of the above technical solution: the second cavity forms a first conical surface at one end near the first cavity, and the diameter of the first conical surface increases in the direction away from the first cavity.

[0010] As a further description of the above technical solution: one end of the valve core abuts against the first conical surface, and the other end is connected to the spring.

[0011] As a further description of the above technical solution: a sleeve is provided on the side of the second housing away from the first housing, and the spring is provided between the second housing and the sleeve.

[0012] As a further description of the above technical solution: the valve core includes a spherical body that abuts against the first conical surface, and the throttling orifice is formed on the spherical body.

[0013] As a further description of the above technical solution: a second conical surface is provided on the side of the spherical body near the sleeve, and the second conical surface cooperates with the first steel ball to block or open the throttling orifice.

[0014] It also includes an installation method for an integrated hydraulic buffer structure, the installation method being applicable to the hydraulic buffer structure described in any of the above technical solutions, comprising: S1. The damping rubber and the stop block are cast and connected by vulcanization process. The damping rubber is placed in the first housing and the stop block is interference-fitted with the first housing to form a damper. The valve core, the first steel ball, and the spring are sequentially placed into the second housing, and the sleeve is press-fitted with the second housing to form a one-way valve. S2. The first housing and the second housing are connected by an interference fit of a retaining ring to form a hydraulic buffer structure; S3. Install the hydraulic buffer structure into the flow channel of the valve block.

[0015] The above technical solution has the following advantages or beneficial effects: By integrating the damper and check valve into a single design, the hydraulic oil flow path is smoother. The damper efficiently absorbs pulse energy, while the check valve stabilizes the flow and controls unidirectional flow. The synergistic effect of the two is more comprehensive in buffering hydraulic pulses than a separate design, taking into account both hydraulic oil flow efficiency and flow control accuracy. This ensures more stable hydraulic control of the system and significantly reduces the noise generated by the piston pump pressurization. The integrated design greatly simplifies the overall structure, with the damper and throttling check valve integrated into a single assembly. This simplifies the assembly process, reduces the number of assembly and sealing points required in a separate design, reduces the risk of hydraulic oil leakage at the source, and improves the reliability of the system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an assembly diagram of the hydraulic buffer structure proposed in this invention; Figure 2 This is a schematic diagram of the hydraulic buffer structure proposed in this invention; Figure 3 This is a perspective view of the second housing in this invention; Figure 4 This is a cross-sectional view of the second housing in this invention; Figure 5 This is a side view of the valve core in this invention; Figure 6 for Figure 5 Sectional view at point A in the middle; Figure 7 This is a flowchart of the installation method proposed in this invention.

[0018] Legend: 1. Valve block; 2. Piston pump output end; 3. First housing; 4. Second housing; 41. First conical surface; 5. Oil passage hole; 6. Damper; 61. Damping rubber; 62. Retaining ring; 63. Annular protrusion; 7. One-way valve; 71. Valve core; 711. Throttling orifice; 712. Spherical body; 713. Second conical surface; 714. Oil passage groove; 72. First steel ball; 73. Spring; 8. Sleeve; 9. Second steel ball. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Reference Figures 1-6 One embodiment of the present invention provides an integrated hydraulic buffer structure, which is embedded in the flow channel of the valve block 1 of the hydraulic control unit and connected in series with the output end 2 of the plunger pump. The hydraulic buffer structure includes: a first housing 3; a second housing 4, which forms a receiving cavity with the first housing 3, and the second housing 4 is provided with a plurality of oil passage holes 5; a damper 6 is provided inside the first housing 3, and a one-way valve 7 is provided inside the second housing 4; the one-way valve 7 includes a valve core 71, a first steel ball 72, and a spring 73; when the output end 2 of the plunger pump outputs hydraulic oil, it enters the receiving cavity through the oil passage holes 5, the valve core 71 separates from the first steel ball 72, and the throttle hole 711 on the one-way valve 7 is open; when the hydraulic oil pressure continues to increase, the damper 6 is deformed by the hydraulic difference, and the valve core 71 of the one-way valve 7 separates from the second housing 4, thus performing multi-stage buffering of the hydraulic oil.

[0021] In this embodiment, a hydraulic buffer structure is embedded in the flow channel of the hydraulic control unit valve block 1 by riveting, and is connected in series with the output end 2 of the plunger pump. This is used to absorb the hydraulic pulses generated by the operation of the plunger pump and reduce noise. The hydraulic oil first passes through the hydraulic buffer structure and then enters the subsequent flow channel to achieve multi-stage hydraulic buffering. When hydraulic oil is output from the plunger pump output terminal 2, it enters the receiving cavity through the oil passage 5. When the hydraulic differential is low, the throttle orifice 711 on the check valve 7 is open. When the plunger pump pressurizes, the hydraulic differential increases, the damper 6 deforms, and the check valve 7 is compressed by the hydraulic oil pushing the valve core 71, increasing the flow rate. This causes the deformation buffer of the damper 6 and the check valve 7 to work together to achieve multi-stage buffering. The damper 6 absorbs the hydraulic pulse energy, and the check valve 7 stabilizes the flow and controls the unidirectional flow, taking into account both the hydraulic oil flow efficiency and the flow control accuracy, ensuring more stable hydraulic control of the system and reducing the noise generated by the plunger pump pressurization. If the hydraulic differential decreases again, the damper 6 deforms and resets, the valve core 71 of the check valve 7 elastically resets, and the throttle orifice 711 is blocked to prevent backflow, further improving the stability of the ESP / ESC system.

[0022] The damper 6 includes a damping rubber 61 and a retaining ring 62. The outer diameter of the damping rubber 61 matches the inner diameter of the first housing 3. Several annular protrusions 63 are provided on the outer side of the damping rubber 61 to form a gap between the damping rubber 61 and the first housing 3.

[0023] In this embodiment, the damping rubber 61 is installed inside the first housing 3. The outer diameter of the damping rubber 61 matches the inner diameter of the first housing 3 to achieve positioning and initial sealing. The retaining ring 62 and the first housing 3 provide axial limit for the damping rubber 61 to prevent it from falling off or undergoing excessive deformation. Several annular protrusions 63 are provided on the outer side of the damping rubber 61 to form multi-point elastic support between the damping rubber 61 and the first housing 3, providing space for hydraulic oil flow and deformation of the damping rubber 61. When under pressure, the damping rubber 61 expands and deforms uniformly to avoid local compression and stress concentration. The elastic deformation of the damping rubber 61 absorbs hydraulic pulse energy and buffers instantaneous pressure impact to achieve flexible buffering.

[0024] The retaining ring 62 is a stepped ring. One end of the retaining ring 62 extends into the inner side of the first housing 3, where it is interference-fitted with the first housing 3 and fits with the damping rubber 61. The other end extends into the inner side of the second housing 4, where it is interference-fitted with the second housing 4.

[0025] In this embodiment, the retaining ring 62 is a stepped bushing with different outer diameters at both ends, forming a stepped positioning surface. One end of the retaining ring 62 extends into the inner side of the first housing 3 and is press-fitted with the first housing 3. The end face presses against the damping rubber 61 to achieve axial positioning and pre-compression, preventing the damping rubber 61 from moving axially. The other end of the retaining ring 62 extends into the inner side of the second housing 4 and is press-fitted with the second housing 4. Axial limiting is achieved through the stepped end face, ensuring that the first housing 3 and the second housing 4 are coaxial and do not deviate. Assembly is simple, which can effectively improve the overall structural strength and working stability, reduce leakage points and simplify the assembly process.

[0026] The diameter of the middle part of the second housing 4 gradually decreases, forming a connected first cavity and a second cavity. Several oil passage holes 5 are opened in the first cavity near the first housing 3, and a one-way valve 7 is installed in the second cavity away from the first housing 3. A first conical surface 41 is formed in the second cavity near the first cavity, and the diameter of the first conical surface 41 increases in the direction away from the first cavity.

[0027] In this embodiment, the diameter of the middle part of the second housing 4 gradually decreases, forming a first cavity and a second cavity that are connected front and back. Several oil passage holes 5 are opened on the side wall of the first cavity and are evenly distributed in the circumference. Hydraulic oil enters the first cavity radially from the output end of the plunger pump through the oil passage holes 5 and then flows to the second cavity. The one-way valve 7 is coaxially engaged with the second cavity to achieve throttling, pressure stabilization and one-way conduction.

[0028] When hydraulic oil enters the first cavity through the oil passage 5, the diameter of the middle part of the second housing 4 gradually decreases to provide buffering. At the same time, under the action of hydraulic pressure, the valve core 71 and spring 73 can be further compressed, causing the valve core 71 to separate from the second housing 4, allowing the hydraulic oil to enter the first conical surface 41. The diameter of the first conical surface 41 gradually increases, allowing the hydraulic oil to flow steadily into the second cavity and into the rear flow channel, achieving smooth flow guidance and reducing eddies and noise.

[0029] One end of the valve core 71 abuts against the first conical surface 41, and the other end is connected to the spring 73.

[0030] In this embodiment, one end of the valve core 71 abuts against the first conical surface 41 of the second housing 4 to form a sealing pair. The first steel ball 72 is fitted inside the valve core 71 to form a two-stage throttling and auxiliary sealing structure with the valve core 71. The other end of the valve core 71 is connected to the spring 73, which provides the valve core 71 with a pre-tightening force for closing the valve. When the hydraulic pressure is greater than the spring pre-tightening force, the valve core 71 is pushed open to achieve conduction. When the hydraulic pressure is less than the spring pre-tightening force, the valve core 71 is tightly closed to achieve shut-off.

[0031] A sleeve 8 is provided on the side of the second housing 4 away from the first housing 3, and a spring 73 is provided between the second housing 4 and the sleeve 8.

[0032] In this embodiment, a sleeve 8 is installed at the end of the second housing 4 away from the first housing 3. The spring 73 is restricted between the second housing 4 and the sleeve 8. One end of the spring 73 is abutted against the valve core 71, and the other end is abutted against the inner wall of the sleeve 8. The spring 73 is in a pre-compressed state, continuously providing pre-tightening force to the valve core 71. The sleeve 8 forms a radial constraint on the spring 73, and the spring always extends and retracts in the center without tilting or twisting, so that the spring 73 is stably supported and the valve core 71 is subjected to uniform force, thereby improving the response consistency of the one-way valve 7.

[0033] The valve core 71 includes a spherical body 712 that abuts against the first conical surface 41, and a throttling orifice 711 is formed on the spherical body 712.

[0034] In this embodiment, the spherical body 712 abuts and seals with the first conical surface 41 of the valve seat. The spherical body 712 has an axial throttling hole 711 for the initial flow of the plunger pump to reduce hydraulic pulses and control back pressure. The valve core 71 has an oil groove 714 on the outside to realize the communication between the cavity inside the valve core 71 and the second housing 4. The spherical body 712 has a second conical surface 713 on the side near the sleeve 8. The second conical surface 713 cooperates with the first steel ball 72 to block or open the throttling orifice 711.

[0035] In this embodiment, the second conical surface 713 and the first steel ball 72 cooperate to form a seal to prevent backflow. In the initial state, the first steel ball 72 blocks the throttling orifice 711 and the one-way valve 7 is closed. When the hydraulic differential is small, the first steel ball 72 is pushed away from the second conical surface 713, and the throttling orifice 711 is opened to achieve small flow throttling and buffering. When the hydraulic differential increases, the valve core 71 compresses the spring 73, and the oil groove 714 is fully opened to increase the flow channel and achieve stable flow of large flow.

[0036] Reference Figure 7 It also includes an installation method for an integrated hydraulic buffer structure, the installation method being applicable to the hydraulic buffer structure of any of the above technical solutions, including: S1. The damping rubber and the stop block are connected by casting through a vulcanization process. The damping rubber is placed into the first housing, so that the stop block and the first housing are interference fit to form a damper. The valve core, the first steel ball, and the spring are sequentially placed into the second housing. The sleeve is then press-fitted to the second housing to form a one-way valve. S2. The first housing and the second housing are connected by an interference fit of a retaining ring to form a hydraulic buffer structure; S3. Install the hydraulic buffer structure into the flow channel of the valve block.

[0037] In this embodiment, the damping rubber 61 and the retaining ring 62 are cast together using a vulcanization process. The combined damping rubber 61 is placed inside the first housing 3, and the retaining ring 62 is pressed and fixed to the first housing 3 with an interference fit, achieving axial positioning of the damping rubber 61. The valve core 71, the first steel ball 72, and the spring 73 are sequentially installed into the second housing 4. The sleeve 8 is pressed and fixed to the second housing 4 with an interference fit. The sleeve 8 provides radial limiting and axial pre-tightening for the spring 73. The first housing 3 and the second housing 4 are connected by an interference fit through the intermediate retaining ring 62, so that the damper 6 and the one-way valve 7 form an integrated hydraulic buffer structure. The hydraulic buffer structure is pressed into the internal flow channel of the valve block 1. The flow channel of the valve block 1 is made to have an interference fit with the one-way valve through pre-compression. Then, the first housing 3 and the valve block 1 are plastically deformed and locked by a riveting process. The outer end of the flow channel of the valve block 1 is sealed by a riveting process using the second steel ball 9, achieving complete sealing and isolation from the outside.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated hydraulic buffer structure, characterized in that, The hydraulic buffer structure is embedded in the flow channel of the hydraulic control unit valve block (1) and connected in series with the output end (2) of the plunger pump. The hydraulic buffer structure includes: First shell (3); The second housing (4) forms a receiving cavity with the first housing (3), and the second housing (4) is provided with a plurality of oil passage holes (5). A damper (6) is provided inside the first housing (3), and a one-way valve (7) is provided inside the second housing (4). The one-way valve (7) includes a valve core (71), a first steel ball (72), and a spring (73); When the piston pump output end (2) outputs hydraulic oil, it enters the receiving cavity through the oil passage (5), the valve core (71) separates from the first steel ball (72), and the throttle orifice (711) on the one-way valve (7) is open. When the hydraulic oil pressure continues to increase, the damper (6) is deformed by the hydraulic differential, and the valve core (71) of the one-way valve (7) is separated from the second housing (4), so as to perform multi-stage buffering of the hydraulic oil.

2. The hydraulic buffer structure according to claim 1, characterized in that: The damper (6) includes a damping rubber (61) and a retaining ring (62). The outer diameter of the damping rubber (61) matches the inner diameter of the first housing (3). The outer side of the damping rubber (61) is provided with a plurality of annular protrusions (63) to form a gap between the damping rubber (61) and the first housing (3).

3. The hydraulic buffer structure according to claim 2, characterized in that: The retaining ring (62) is a stepped ring. One end of the retaining ring (62) extends into the inner side of the first housing (3), and is in interference fit with the first housing (3) and in fit with the damping rubber (61). The other end extends into the inner side of the second housing (4), and is in interference fit with the second housing (4).

4. The hydraulic buffer structure according to claim 1, characterized in that: The diameter of the middle part of the second housing (4) gradually decreases to form a connected first cavity and a second cavity. Several oil passage holes (5) are opened in the first cavity near the first housing (3), and the one-way valve (7) is provided in the second cavity away from the first housing (3).

5. The hydraulic buffer structure according to claim 1, characterized in that: The second cavity forms a first conical surface (41) at one end near the first cavity, and the diameter of the first conical surface (41) increases in the direction away from the first cavity.

6. The hydraulic buffer structure according to claim 5, characterized in that: One end of the valve core (71) abuts against the first conical surface (41), and the other end is connected to the spring (73).

7. The hydraulic buffer structure according to claim 6, characterized in that: A sleeve (8) is provided on the side of the second housing (4) away from the first housing (3), and the spring (73) is provided between the second housing (4) and the sleeve (8).

8. The hydraulic buffer structure according to claim 7, characterized in that: The valve core (71) includes a spherical body (712) that abuts against the first conical surface (41), and the throttling orifice (711) is formed on the spherical body (712).

9. The hydraulic buffer structure according to claim 8, characterized in that: The spherical body (712) has a second conical surface (713) on the side near the sleeve (8). The second conical surface (713) cooperates with the first steel ball (72) to block or open the throttling hole (711).

10. A method for installing an integrated hydraulic buffer structure, characterized in that, The installation method is applicable to the hydraulic buffer structure described in any one of claims 1-9, and includes: S1. The damping rubber and the stop block are cast and connected by vulcanization process. The damping rubber is placed in the first housing and the stop block is interference-fitted with the first housing to form a damper. The valve core, the first steel ball, and the spring are sequentially placed into the second housing, and the sleeve is press-fitted with the second housing to form a one-way valve. S2. The first housing and the second housing are connected by an interference fit of a retaining ring to form a hydraulic buffer structure; S3. Install the hydraulic buffer structure into the flow channel of the valve block.

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