Hydraulic buffer structure in hydraulic control unit valve block and installation method

Abstract

The application discloses a hydraulic buffer structure in a valve block of a hydraulic control unit and a mounting method, which comprises a valve block body, a damper and a throttling one-way valve arranged in parallel on the inner side of the valve block body, and the input ends of the damper and the throttling one-way valve are communicated with the output end of a plunger pump, and the valve block body is blocked from the outside through a first steel ball; when the plunger pump outputs hydraulic oil, the hydraulic oil is shunted to the damper and the throttling one-way valve, and the hydraulic pressure difference makes the throttling one-way valve change from an initial state to a first state, in the first state, the throttling hole of the throttling one-way valve is conducted; when the hydraulic pressure difference increases, the damper is deformed, the throttling one-way valve changes from the first state to a second state, in the second state, the valve core and the valve seat of the throttling one-way valve are separated, the flow of the throttling one-way valve is increased, and the hydraulic oil is subjected to multi-stage buffering; the hydraulic pulse is comprehensively buffered, the noise generated by the plunger pump is greatly reduced, meanwhile, the smooth flow of the hydraulic oil is ensured, the backflow is avoided, and the stability of an ESP / ESC system is further improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control of vehicle stability systems, and in particular to a hydraulic buffer structure and installation method within the valve block of a hydraulic control unit. 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] To address these issues, existing technologies typically incorporate various hydraulic buffer components, such as a throttle check valve, at the outlet of the piston pump to buffer hydraulic pulses and suppress noise. However, these external hydraulic buffer components increase the size of the hydraulic control unit, encroaching on the internal installation space of the electronic control unit (ECU). This can negatively impact the assembly compatibility, ease of use, and operational reliability of other hydraulic components within the ECU, and in severe cases, lead to hydraulic oil leakage. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a hydraulic buffer structure and installation method within the valve block of a hydraulic control unit.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a hydraulic buffer structure within a valve block of a hydraulic control unit, comprising: Valve block body; The valve block body is provided with a damper and a throttling check valve connected in parallel inside. The input ends of the damper and the throttling check valve are connected to the output end of the plunger pump. The valve block body is sealed from the outside through the first steel ball. When the piston pump outputs hydraulic oil, it is diverted to the damper and the throttle check valve. The hydraulic difference causes the throttle check valve to change from the initial state to the first state. In the first state, the throttle orifice of the throttle check valve is open. When the hydraulic pressure difference increases, the damper deforms, and the throttling check valve changes from the first state to the second state. In the second state, the valve core and valve seat of the throttling check valve separate, increasing the flow rate of the throttling check valve and providing multi-stage buffering for the hydraulic oil.

[0006] As a further description of the above technical solution: the damper includes a housing, damping rubber and a stop block, the housing is sleeved on the outside of the damping rubber, and the stop block extends towards the center to limit the damping rubber.

[0007] As a further description of the above technical solution: the outer side of the damping rubber is provided with several annular protrusions, so that a gap is formed between the damping rubber and the shell.

[0008] As a further description of the above technical solution: the throttling check valve includes a valve seat, the valve core is disposed in the valve seat, a valve cover is disposed on one side of the valve seat, a second steel ball is disposed on the side of the valve core near the valve cover, and a spring is disposed between the valve core and the valve cover.

[0009] As a further description of the above technical solution: the valve seat includes a positioning part and an extension part, and an annular groove is provided at the connection between the positioning part and the extension part.

[0010] As a further description of the above technical solution: the positioning cavity forms a first conical surface at one end near the extension, the diameter of the first conical surface decreases along the direction of the extension, and the extension cavity forms a second conical surface at one end near the positioning part, the diameter of the second conical surface increases in the direction away from the positioning part.

[0011] As a further description of the above technical solution: the valve core includes a spherical body that abuts against the second conical surface, and the throttling orifice is formed on the spherical body, the axial direction of the throttling orifice being the same as the axial direction of the valve core cavity.

[0012] As a further description of the above technical solution: a third conical surface is provided on the side of the spherical body near the valve cover, and the third conical surface cooperates with the second steel ball to block or open the throttling orifice.

[0013] As a further description of the above technical solution: several oil passage grooves are opened on the outer side of the valve core, so that the cavity on the inner side of the valve core is connected to the valve seat.

[0014] It also includes a method for installing a hydraulic buffer structure, the method being applicable to the hydraulic buffer structure described in any of the above technical solutions, comprising: S1. A vulcanization process is performed on the stop block to connect the damping rubber and the stop block as a single unit. The damping rubber is then assembled inside the housing, and the housing and the stop block are interference-fitted to form a damper. Insert the valve core and the second steel ball into the valve seat in sequence, put the spring into the valve cover, align the valve seat and the valve cover and then perform an interference fit to form a throttling check valve; S2. The damper and the throttling check valve are installed into the flow channel of the valve block body by riveting process; S3. The first steel ball is embedded in the valve block body through a steel ball riveting process to seal it from the outside.

[0015] The above technical solution has the following advantages or beneficial effects: 1. By integrating a damper and a throttling check valve in parallel within the hydraulic control unit valve block, hydraulic oil can flow through two channels simultaneously. The damper's deformation buffering and the throttling check valve's multi-stage buffering work synergistically. The damper absorbs hydraulic pulse energy, while the throttling check valve stabilizes the flow and controls unidirectional flow, achieving comprehensive buffering of hydraulic pulses. This significantly reduces noise generated by the piston pump's pressurization, while ensuring smooth hydraulic oil flow and preventing backflow, further enhancing the stability of the ESP / ESC system. The integrated hydraulic control unit valve block has the same overall dimensions as existing products, requiring no changes to installation space or assembly methods, making it highly adaptable.

[0016] 2. The assembly process of the damper and the throttling check valve is simple, requiring no additional processing of complex connection structures and no increase in the volume of the hydraulic control unit valve block, thus reducing production and assembly costs and improving production efficiency. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the hydraulic buffer structure proposed in this invention; Figure 2 This is a schematic diagram of the damper structure in this invention; Figure 3 This is a schematic diagram of the throttling check valve in this invention; Figure 4 This is a schematic diagram of the valve seat structure in this invention; Figure 5 This is a side view of the valve core in this invention; Figure 6 for Figure 5 Side sectional view at point A; Figure 7 This is a flowchart of the installation method proposed in this invention.

[0019] Legend: 1. Valve block body; 2. Damper; 21. Housing; 22. Damping rubber; 221. Annular protrusion; 23. Stop block; 3. Throttling check valve; 31. Valve core; 311. Throttling orifice; 312. Spherical body; 3121. Third conical surface; 313. Oil groove; 32. Valve seat; 321. Positioning part; 3211. First conical surface; 322. Extension part; 3221. Second conical surface; 323. Annular groove; 33. Valve cover; 34. Second steel ball; 35. Spring; 4. First steel ball; 5. Plunger pump output end. Detailed Implementation

[0020] 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.

[0021] Reference Figures 1-6 The present invention provides an embodiment of a hydraulic buffer structure within a valve block of a hydraulic control unit, comprising: a valve block body 1; a damper 2 and a throttling check valve 3 connected in parallel are disposed inside the valve block body 1, the input ends of the damper 2 and the throttling check valve 3 are connected to the output end 5 of a plunger pump, and the valve block body 1 is sealed from the outside through a first steel ball 4; when the output end 5 of the plunger pump outputs hydraulic oil, it is diverted to the damper 2 and the throttling check valve 3, and the hydraulic difference causes the throttling check valve 3 to change from an initial state to a first state. In the first state, the throttling orifice 311 of the throttling check valve 3 is open; when the hydraulic difference increases, the damper 2 deforms, and the throttling check valve 3 changes from the first state to a second state. In the second state, the valve core 31 and the valve seat 32 of the throttling check valve 3 separate, increasing the flow rate of the throttling check valve 3 and providing multi-stage buffering for the hydraulic oil.

[0022] In this embodiment, the valve block body 1 integrates a damper 2 and a throttling check valve 3 connected in parallel. The input ends of the damper 2 and the throttling check valve 3 are connected to the output end 5 of the piston pump, ensuring that the hydraulic oil can be diverted to the damper 2 and the throttling check valve 3. When the hydraulic pressure difference is low, the throttling check valve 3 changes from the initial state to the first state, and the throttling orifice 311 is open. When the piston pump pressurizes, the hydraulic pressure difference increases, the damper 2 deforms, and the throttling check valve 3 changes from the first state to the second state. The hydraulic oil pushes the valve core 31 to compress, increasing the flow rate. This allows the deformation buffer of the damper 2 and the multi-stage buffering of the throttling check valve 3 to work together. The damper 2 absorbs the hydraulic pulse energy, and the throttling check valve 3 stabilizes the flow and controls the unidirectional flow, achieving comprehensive buffering of hydraulic pressure pulses, significantly reducing the noise generated by the piston pump pressurization, and ensuring smooth hydraulic oil flow. If the pressure at the output end 5 of the plunger pump is low, the damper 2 deforms and resets, the throttle check valve 3 returns to its initial state, and the throttle orifice 311 is blocked to prevent backflow, further improving the stability of the ESP / ESC system. The integrated hydraulic control unit valve block has the same overall shape as existing products, requiring no changes to the installation space or assembly method, making it highly adaptable.

[0023] Reference Figure 2 The damper 2 includes a housing 21, a damping rubber 22, and a stop block 23. The housing 21 is fitted on the outside of the damping rubber 22, and the stop block 23 extends toward the center to limit the damping rubber 22. Several annular protrusions 221 are provided on the outside of the damping rubber 22 to form a gap between the damping rubber 22 and the housing 21.

[0024] In this embodiment, the housing 21 is sleeved on the outside of the damping rubber 22, and the stop block 23 extends towards the center to limit the damping rubber 22. The housing 21 and the stop block 23 are interference fit to prevent the damping rubber 22 from falling off and excessively deforming. Several annular protrusions 221 are provided on the outside of the damping rubber 22 to form a gap between the damping rubber 22 and the housing 21, providing space for the flow of hydraulic oil and the deformation of the damping rubber 22. The damping rubber 22 absorbs hydraulic pulse energy through elastic deformation, buffers instantaneous pressure impact, and achieves flexible buffering.

[0025] Reference Figure 3 The throttling check valve 3 includes a valve seat 32, a valve core 31 disposed inside the valve seat 32, a valve cover 33 disposed on one side of the valve seat 32, a second steel ball 34 disposed on the side of the valve core 31 near the valve cover 33, and a spring 35 disposed between the valve core 31 and the valve cover 33.

[0026] In this embodiment, a valve core 31 is provided inside the valve seat 32, and a valve cover 33 is installed on one side of the valve seat by interference fit. A spring 35 and a second steel ball 34 are provided between the valve core and the valve cover. The spring 35 pushes the valve core 31 to abut against the valve seat 32. The spring 35 is in a compressed state and provides preload. The second steel ball 34 is not affected by the elastic force of the spring 35 and only abuts or separates from the valve core 31 by hydraulic differential.

[0027] The valve seat 32 includes a positioning part 321 and an extension part 322, and an annular groove 323 is provided at the connection between the positioning part 321 and the extension part 322.

[0028] In this embodiment, the positioning part 321 is integrally connected with the extension part 322, and the positioning part 321 forms a protrusion along the radial direction of the extension part 322 for positioning during installation. An annular groove 323 is provided at the connection between the positioning part 321 and the extension part 322. When the throttling check valve 3 is riveted and assembled, the aluminum material of the valve block body 1 is squeezed into the annular groove 323, and the valve seat 32 is fixed by self-meshing (a type of riveting process, which is the prior art).

[0029] Reference Figure 4 The cavity of the positioning part 321 forms a first conical surface 3211 at one end near the extension part 322. The diameter of the first conical surface 3211 decreases along the direction of the extension part 322. The cavity of the extension part 322 forms a second conical surface 3221 at one end near the positioning part 321. The diameter of the second conical surface 3221 increases along the direction away from the positioning part 321.

[0030] In this embodiment, the first conical surface 3211 and the second conical surface 3221 form a gradient flow channel. When hydraulic oil enters the first conical surface 3211 from the cavity at the positioning part 321, the diameter of the first conical surface 3211 gradually decreases to provide buffering. At the same time, under the action of hydraulic pressure, the valve core 31 can be pushed and the spring 35 can be further compressed, causing the valve core 31 to separate from the valve seat, allowing the hydraulic oil to enter the second conical surface 3221. The diameter of the second conical surface 3221 gradually increases, allowing the hydraulic oil to flow steadily into the extension part 322 and into the rear flow channel.

[0031] Reference Figures 5-6 The valve core 31 includes a spherical body 312 that abuts against the second conical surface 3221. A throttling orifice 311 is provided on the spherical body 312, and the axial direction of the throttling orifice 311 is the same as the axial direction of the valve core 31 cavity. A third conical surface 3121 is provided on the side of the spherical body 312 near the valve cover 33. The third conical surface 3121 cooperates with the second steel ball 34 to block or open the throttling orifice 311. Several oil passage grooves 313 are provided on the outer side of the valve core 31 so that the cavity on the inner side of the valve core 31 is connected to the valve seat 32.

[0032] In this embodiment, the spherical body 312 abuts and seals with the second conical surface 3221 of the valve seat. The spherical body has an axial throttling orifice 311 for the initial flow of the plunger pump to reduce hydraulic pulses and control back pressure. The valve core 31 has an oil groove 313 on its outer side to connect the inner cavity of the valve core 31 with the valve seat 32. The third conical surface 3121 and the second steel ball 34 cooperate to form a seal to prevent backflow. In the initial state, the second steel ball 34 blocks the throttling orifice 311 and the throttling check valve 3 is closed. When the hydraulic difference is small, the second steel ball 34 is pushed away from the third conical surface 3121, and the throttling orifice 311 is open to achieve small flow throttling buffer. When the hydraulic difference increases, the valve core 31 compresses the spring 35, and the oil groove 313 is fully open to increase the flow channel and achieve stable flow of large flow.

[0033] Reference Figure 7 It also includes a method for installing a hydraulic buffer structure, the installation method being applicable to the hydraulic buffer structure of any of the above technical solutions, including: S1. Perform a vulcanization process on the stop block to connect the damping rubber and the stop block as a whole. The damping rubber is assembled inside the housing, and the housing and the stop block are interference-fitted to form a damper. Insert the valve core and the second steel ball into the valve seat in sequence, put the spring into the valve cover, align the valve seat and the valve cover and then perform an interference fit to form a throttling check valve; S2. The damper and the throttling check valve are installed into the flow channel of the valve block body by riveting process; S3. The first steel ball is embedded in the valve block body through a steel ball riveting process to seal it from the outside.

[0034] In this embodiment, the damping rubber 22 and the stop block 23 are integrated through a vulcanization process to ensure a firm connection. The damping rubber 22 is assembled between the housing 21 and the stop block 23, with the housing 21 and the stop block 23 having an interference fit to form a complete damper. The spring 35 is placed inside the valve cover 33, and then the valve core 31 and the second steel ball 34 are sequentially installed into the valve seat 32, so that the third conical surface 3121 of the valve core 31 fits against the second steel ball 34. The valve cover 33 is pressed into the valve seat 32 through an interference fit. At this time, the spring 35 is in a compressed state, providing the valve core 31 with a restoring force, and abutting against the second conical surface 3221 of the valve seat 32.

[0035] The damper 2 and the throttling check valve 3 are pressed together into the pre-set mounting hole in the flow channel of the valve block body 1 through a riveting process, thereby fixing the damper 2 to the valve block body 1. Its flow channel is connected to the flow channel of the plunger pump output end 5. The aluminum material of the valve block body 1 hole wall is squeezed into the annular groove 323 of the valve seat 32 through a self-meshing riveting process, thereby achieving a firm connection between the throttling check valve 3 and the valve block body 1.

[0036] A steel ball 4 is embedded in the flow channel of the throttling check valve 3 on the valve block body 1 using a steel ball riveting process, which seals against the outside to ensure sealing performance.

[0037] The assembly process of damper 2 and throttling check valve 3 is simple, requiring no additional processing of complex connection structures and no increase in the volume of valve block body 1 of hydraulic control unit, thus reducing production and assembly costs and improving production efficiency.

[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. A hydraulic buffer structure within a valve block of a hydraulic control unit, characterized in that, include: Valve block body (1); The valve block body (1) is provided with a damper (2) and a throttling check valve (3) connected in parallel. The input ends of the damper (2) and the throttling check valve (3) are connected to the output end (5) of the plunger pump. The valve block body (1) is sealed from the outside through the first steel ball (4). When the piston pump output end (5) outputs hydraulic oil, it is diverted to the damper (2) and the throttle check valve (3). The hydraulic difference causes the throttle check valve (3) to change from the initial state to the first state. In the first state, the throttle orifice (311) of the throttle check valve (3) is open. When the hydraulic pressure difference increases, the damper (2) deforms, and the throttling check valve (3) changes from the first state to the second state. In the second state, the valve core (31) and valve seat (32) of the throttling check valve (3) separate, increasing the flow rate of the throttling check valve (3) and performing multi-stage buffering of the hydraulic oil.

2. The hydraulic buffer structure according to claim 1, characterized in that: The damper (2) includes a housing (21), a damping rubber (22), and a stop (23). The housing (21) is fitted on the outside of the damping rubber, and the stop (23) extends toward the center to limit the damping rubber (22).

3. The hydraulic buffer structure according to claim 2, characterized in that: The damping rubber (22) has several annular protrusions (221) on its outer side, so that a gap is formed between the damping rubber (22) and the housing (21).

4. The hydraulic buffer structure according to claim 1, characterized in that: The throttling check valve (3) includes a valve seat (32), a valve core (31) is disposed in the valve seat (32), a valve cover (33) is disposed on one side of the valve seat (32), a second steel ball (34) is disposed on the side of the valve core (31) near the valve cover (33), and a spring (35) is disposed between the valve core (31) and the valve cover (33).

5. The hydraulic buffer structure according to claim 4, characterized in that: The valve seat (32) includes a positioning part (321) and an extension part (322), and an annular groove (323) is provided at the connection between the positioning part (321) and the extension part (322).

6. The hydraulic buffer structure according to claim 5, characterized in that: The cavity of the positioning part (321) forms a first conical surface (3211) at one end near the extension part (322), the diameter of the first conical surface (3211) decreases along the direction of the extension part (322), and the cavity of the extension part (322) forms a second conical surface (3221) at one end near the positioning part (321), the diameter of the second conical surface (3221) increases along the direction away from the positioning part (321).

7. The hydraulic buffer structure according to claim 6, characterized in that: The valve core (31) includes a spherical body (312) that abuts against the second conical surface (3221). The throttling orifice (311) is provided on the spherical body (312), and the axial direction of the throttling orifice (311) is the same as the axial direction of the cavity of the valve core (31).

8. The hydraulic buffer structure according to claim 7, characterized in that: The spherical body (312) has a third conical surface (3121) on the side near the valve cover (33). The third conical surface (3121) cooperates with the second steel ball (34) to block or open the throttling orifice (311).

9. The hydraulic buffer structure according to claim 4, characterized in that: Several oil passage grooves (313) are opened on the outer side of the valve core (31) so that the cavity on the inner side of the valve core (31) is connected to the valve seat (32).

10. A method for installing a 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. A vulcanization process is performed on the stop block to connect the damping rubber and the stop block as a single unit. The damping rubber is then assembled inside the housing, and the housing and the stop block are interference-fitted to form a damper. Insert the valve core and the second steel ball into the valve seat in sequence, put the spring into the valve cover, align the valve seat and the valve cover and then perform an interference fit to form a throttling check valve; S2. The damper and the throttling check valve are installed into the flow channel of the valve block body by riveting process; S3. The first steel ball is embedded in the valve block body through a steel ball riveting process to seal it from the outside.

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