Steel ball impressing method and impressing tool of normally-closed valve and sealing detection device

Abstract

The embodiment of the invention provides a steel ball imprinting method and imprinting tool for a normally-closed valve and a sealing detection device. After a valve seat is pressed into a supporting seat, imprinting of a steel ball is carried out; steel ball imprinting is completed through an imprinting tool comprising a guide sleeve, a pressing head and a supporting pin, and after steel ball imprinting, a sealing detection device is used for testing. The sealing performance of the stretching forming valve seat is improved in a steel ball stamping mode, the sealing detection device for the sealing performance of the stamped valve seat is designed, and it is ensured that the sealing quality of each valve seat meets the standard. Through the design of the supporting pin for preventing the valve seat from deforming, the imprinting process is more accurate, and the sealing performance problem caused by deformation in the machining process is avoided. The sealing precision and the overall performance of the normally-closed valve are improved, and therefore the reliability of the braking effect in a brake-by-wire system is guaranteed, and particularly the stability and the safety under the working conditions of an ABS and the like are guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of normally closed valve sealing in vehicle braking systems, and is particularly applicable to normally closed valve parts in wire-controlled brake systems, and more particularly to a steel ball stamping method, stamping tool and sealing detection device for a normally closed valve. Background Art

[0002] The vehicle braking system is developing towards wire control, and currently mainly adopts an electronic mechanical hydraulic system as the core structure. The wire control brake system is mainly composed of a master cylinder, a pedal displacement sensor, a motor, an electric cylinder, a motor position sensor, a solenoid valve, a pressure sensor, and an electronic control unit (ECU). When the driver steps on the brake pedal, the ECU in the system determines the braking demand by detecting changes in the pedal displacement sensor connected to the pedal. Based on this change, the ECU instructs the motor to work, drives the electric cylinder to generate the required braking pressure, compresses the brake fluid to build up the hydraulic pressure and transmits it to the wheel cylinder, thereby achieving braking of the vehicle.

[0003] In this system, the normally closed valve is the core component of the wire control brake system, especially in the working state of the anti-lock braking system (ABS), and participates in the pressure maintenance and pressure relief process. The sealing performance of the normally closed valve directly affects the overall braking effect of the system, especially the braking distance, so its performance is crucial to vehicle safety. Especially in the braking system with high precision requirements, the sealing surface morphology of the normally closed valve will be affected by the processing technology and the valve seat material.

[0004] In the existing technology, it is often difficult to ensure good sealing performance of the valve seat formed by stretching, and it needs to be improved through the steel ball stamping process. However, in the traditional stamping process, due to the influence of the interference force on the valve seat and the recovery problem of the elastic deformation of the valve seat, the sealing effect cannot meet the high standard requirements.

[0005] Therefore, it is necessary to solve the deformation problem of the valve seat during the stamping process in the prior art, so as to improve the sealing effect and ensure that the sealing performance of the normally closed valve meets the use requirements. Summary of the invention

[0006] The purpose of the present application is to solve the problem of deformation in the valve seat stamping process in the prior art. Therefore, the present application provides a steel ball stamping method, a stamping tool and a sealing detection device for a normally closed valve, which can improve the sealing accuracy and overall performance of the normally closed valve, thereby ensuring the reliability of the braking effect in the wire control brake system, especially the stability and safety under working conditions such as ABS.

[0007] The embodiment of the present application provides a steel ball stamping method for a normally closed valve, the normally closed valve comprising: a support seat, a valve seat, a steel ball, a moving iron, a spring, a static iron and a magnetic isolation tube, the static iron and the magnetic isolation tube, the support seat and the magnetic isolation tube are connected together by welding, the valve seat is pressed into the support seat, a steel ball is fixed on the moving iron, a coil is provided on the outer sleeve of the magnetic isolation tube, and the moving iron can move between the valve seat and the static iron by energizing and de-energizing the coil, the steel ball stamping method comprising: After the valve seat is pressed into the support seat, the steel ball is stamped; Ball coining is accomplished by using a coining tool consisting of a guide sleeve, coin ram, and support pins.

[0008] In some embodiments, a support pin is disposed on the lower seat to prevent deformation of the valve seat during the stamping process; The lower seat is used to support the valve seat and the support pin.

[0009] In some embodiments, the pressure head applies pressure to the steel ball to achieve the imprinting of the steel ball on the valve seat sealing surface.

[0010] In some embodiments, after the steel ball is embossed, it is tested using a sealing detection device; The sealing detection device includes: an upper tooling, a transfer block, a base and an ejector pin; The ejector pin is connected to the cylindrical pin and the actual force conditions are simulated by a spring.

[0011] The embodiment of the present application also provides a stamping tool for a normally closed valve, comprising: Guide sleeve, steel ball, support pin, lower seat and pressure head; The support pin is fixed to the lower seat to prevent the valve seat from deforming during the stamping process; Guide sleeve, used to guide the steel ball to the sealing surface of the valve seat; Steel ball, used to form an impression on the sealing surface of the valve seat; A lower seat, used to support the valve seat and the support pin; The pressure head is used to apply pressure to the steel ball so that the steel ball forms an impression on the sealing surface of the valve seat.

[0012] In some embodiments, the guide sleeve is disposed between the steel ball and the pressing head to guide the pressing head to accurately imprint the steel ball.

[0013] In some embodiments, the pressure head acts directly on the steel ball by applying pressure to ensure that a uniform indentation is formed on the sealing surface.

[0014] The embodiment of the present application also provides a sealing detection device for a normally closed valve, the normally closed valve comprising: a valve seat and a support seat, comprising: Upper tooling, adapter block, base and ejector pin; The ejector pin is connected to the cylindrical pin and the actual force conditions are simulated by a spring; The upper fixture and the adapter block are connected by screws to form a test assembly; A base, used to support the valve seat and the adapter block; Ejector pins and cylindrical pins are used to apply simulated spring forces to the steel balls; Sealing ring, used to ensure that no leakage occurs in non-testing parts; Air inlet and outlet, used to test the air tightness of the sealing performance.

[0015] In some embodiments, an "O" ring seal is used to prevent leakage from non-testing sites.

[0016] In some embodiments, during testing, gas is introduced through the air inlet, and a leak meter is connected from the air outlet to monitor the sealing performance of the steel ball in real time.

[0017] The embodiments of the present application can effectively solve the problems of poor valve seat sealing and valve seat deformation after steel ball stamping in the prior art. After using the steel ball stamping tool of the present application, the accuracy and stability of the valve seat sealing surface can be significantly improved, thereby improving the sealing performance of the normally closed valve, reducing the problems caused by seal failure in the brake system, thereby ensuring the reliability and safety of the vehicle brake system. In addition, it can also reduce the cost of parts and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a normally closed valve provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a valve seat after being pressed into a support seat provided in an embodiment of the present application; Figure 3 A schematic diagram of assembling a valve seat and a support seat into a lower seat provided in an embodiment of the present application; Figure 4 A schematic diagram of an assembly of an imprinting tool provided in an embodiment of the present application; Figure 5 A schematic structural diagram of a sealing detection device for a normally closed valve provided in an embodiment of the present application; Description of reference numerals: 21: support seat; 22: valve seat; 22-1: sealing surface; 23: steel ball; 24: moving iron; 25: (normally closed valve) spring; 26: stationary iron; 27: magnetic isolation tube; 11: guide sleeve; 13: support pin; 14: lower seat; 15: pressure head; 31: upper tooling; 32: cylindrical pin; 33: (seal detection device) spring; 34: adapter block; 34-1: air inlet; 35: ejector pin; 36: base; 36-1: air outlet; 37: “O” type sealing ring; 38: “O” type sealing ring; 310: “O” type sealing ring; 311: “O” type sealing ring; 312: screw assembly; 313: ejector screw. DETAILED DESCRIPTION

[0019] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation. On the contrary, the purpose of introducing the application in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present application. In order to provide a deep understanding of the present application, the following description will include many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0020] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0021] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application 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 cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] In the description of the present application, it should be understood that in the present application, "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as a form in which different components in the circuit structure are connected through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals. "Coupled by..." can be understood as electrical conduction through air by indirect coupling. Indirect coupling can be understood as contactless coupling, in which, it can be understood by those skilled in the art that the coupling phenomenon refers to the phenomenon that there is close cooperation and mutual influence between the input and output of two or more circuit elements or electrical networks, and energy is transmitted from one side to the other through interaction. In order to make the purpose, technical solution and advantages of the present application clearer, the implementation method of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0024] In existing vehicle braking systems, especially the normally closed valves of the wire control brake system, the sealing performance is crucial to the overall function of the system. The valve seat sealing surface of the normally closed valve is usually affected by the manufacturing process, especially when the stretch forming process is used, the sealing performance is often unstable. Therefore, it is necessary to adopt the steel ball stamping process to improve the accuracy of the sealing surface.

[0025] At present, the connection between the valve seat and the support seat is mostly achieved by machining. However, although the stretch forming process can improve production efficiency, it will affect the sealing performance of the valve seat. Therefore, in this case, it is particularly important to optimize the sealing surface accuracy through the steel ball embossing process.

[0026] Specifically, when the valve seat is made by stretch forming, the interference force during the press-fitting process and the elastic recovery of the valve seat may cause the sealing surface to deform, which seriously affects the sealing effect. Therefore, it is necessary to eliminate this effect through a fine stamping process to ensure that the sealing performance between the valve seat and the support seat is stable and reliable.

[0027] Figure 1 A schematic diagram of the structure of a normally closed valve provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the normally closed valve mainly includes a support seat 21, a valve seat 22, a steel ball 23, a moving iron 24, a (normally closed valve) spring 25, a stationary iron 26 and a magnetic isolation tube 27.

[0028] The two components, the stationary iron 26 and the magnetic isolation tube 27, and the support seat 21 and the magnetic isolation tube 27, are connected together by welding. The valve seat 22 is pressed into the support seat 21, a steel ball 23 is fixed on the moving iron 24, and the moving iron 24 can move between the valve seat 22 and the stationary iron 26; the magnetic isolation tube 27 is covered with a coil.

[0029] Specifically, the valve seat 22 is provided with an oil hole and a sealing surface 22-1, and the side of the support seat 21 is provided with a throttle hole. When the coil is not energized, the moving iron 24 is compressed by the spring 25, so that the steel ball 23 and the sealing surface 22-1 on the valve seat 22 are sealed, thereby cutting off the oil hole on the valve seat 22 and the throttle hole on the support seat 21. When the coil is energized, the stationary iron 26 and the moving iron 24 are magnetized, and under the action of the electromagnetic valve force, the moving iron 24 overcomes the force of the spring 25 and then engages with the stationary iron 26, thereby separating the steel ball 23 and the sealing surface 22-1 of the valve seat 22, and at this time, the oil hole on the valve seat 22 and the throttle hole on the support seat 21 are connected.

[0030] Figure 2 A schematic diagram of the structure of a valve seat after being pressed into a support seat provided in an embodiment of the present application, as shown in FIG. Figure 2 As shown, in the present application, after the valve seat 22 is pressed into the support seat 21 , the steel ball 23 is stamped; the stamping of the steel ball 23 is completed by using a stamping tool including a guide sleeve 11 , a pressure head 15 and a support pin 13 .

[0031] Figure 3 A schematic diagram of an assembly of a valve seat and a support seat placed in a lower seat provided in an embodiment of the present application, as shown in FIG. Figure 3 As shown, the support pin 13 is disposed on the lower seat 14 to prevent the valve seat 22 from deforming during the stamping process; the lower seat 14 is used to support the valve seat 22 and the support pin 13 .

[0032] Specifically, the support pin 13 is first placed into the lower seat 14, and then the valve seat 22 and the support seat 21 assembly are placed into the lower seat 14, the upper end surface of the support pin 13 contacts the bottom of the valve seat 22, and a circular hole is opened in the middle of the upper end surface of the support pin 13 to avoid the lower protrusion of the valve seat 22.

[0033] Furthermore, Figure 4 A schematic diagram of an assembly of an imprinting tool provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, after the support pin 13 is placed into the lower seat 14 and then the valve seat 22 and the support seat 21 assembly are placed into the lower seat 14, the pressure head 15 applies pressure to the steel ball 23 to achieve the stamping of the steel ball 23 on the sealing surface 22-1 of the valve seat 22.

[0034] Specifically, after the support pin 13 is placed into the lower seat 14, and then the valve seat 22 and the support seat 21 assembly are placed into the lower seat 14, the steel ball 23 is placed so that the steel ball 23 falls into the sealing surface 22-1 of the valve seat 22; then, the guide sleeve 11 is placed; then, the pressure head 15 is placed, and a certain pressure is applied to the pressure head 15 to form an imprint on the sealing surface 22-1 of the valve seat 22.

[0035] The supporting pin 13 mainly functions to prevent the valve seat 22 from deforming during the stamping process.

[0036] The present application also provides a stamping tool for a normally closed valve, such as Figure 4 As shown, the stamping tool includes: a guide sleeve 11, a steel ball 23, a support pin 13, a lower seat 14 and a stamping head 15.

[0037] Among them, the support pin 13 is fixed to the lower seat 14, and is used to prevent the valve seat 22 from deforming during the stamping process; the guide sleeve 11 is used to guide the steel ball 23 to the sealing surface 22-1 of the valve seat 22; the steel ball 23 is used to form an imprint on the sealing surface 22-1 of the valve seat 22; the lower seat 14 is used to support the valve seat 22 and the support pin 13; the pressure head 15 is used to apply pressure to the steel ball 23 so that the steel ball 23 forms an imprint on the sealing surface 22-1 of the valve seat 22.

[0038] Specifically, the guide sleeve 11 is disposed between the steel ball 23 and the pressure head 15, and guides the pressure head 15 to accurately press the steel ball 23. The pressure head 15 directly acts on the steel ball 23 by applying pressure, ensuring that a uniform indentation is formed on the sealing surface 22-1.

[0039] Furthermore, after the steel ball 23 is stamped, it is tested using a sealing detection device; the sealing detection device includes: an upper tooling 31, a transfer block 34, a base 36 and a ejector pin 35; the ejector pin 35 is connected to the cylindrical pin 32, and the actual stress condition is simulated through the (sealing detection device) spring 33.

[0040] Figure 5 A structural schematic diagram of a sealing detection device for a normally closed valve provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the embodiment of the present application also provides a sealing detection device for a normally closed valve, the normally closed valve, including: a valve seat 22 and a support seat 21, a sealing detection tool, including: an upper tool 31, a transfer block 34, a base 36 and an ejector pin 35; the ejector pin 35 is connected to the cylindrical pin 32, and simulates the actual stress condition through the (sealing detection device) spring 33. The upper tool 31 and the transfer block 34 are connected by screws to form a test assembly; the base 36 is used to support the valve seat 22 and the transfer block 34; the ejector pin 35 and the cylindrical pin 32 are used to apply a simulated spring force to the steel ball 23; the sealing ring is used to ensure that no leakage occurs in the non-detection part; the air inlet 34-1 and the air outlet 36-1 are used to test the air tightness of the sealing performance.

[0041] In some optional embodiments, an O-ring (37, 38, 310, 311) is used to prevent leakage at non-testing locations. During testing, gas is introduced through the gas inlet 34-1, and a leak meter is connected from the gas outlet 36-1 to monitor the sealing performance of the steel ball 23 in real time.

[0042] Specifically, Figure 5As shown, the sealing detection device is composed of an upper tooling 31, an adapter block 34 and a base 36. A large boss is provided at the upper end of the base 36, and a large countersunk hole is provided at the lower end of the adapter block 34, and the large boss and the large countersunk hole form a matching relationship. A small countersunk hole is provided at the upper end of the adapter block 34, and a small boss is provided at the lower end of the upper tooling 31, and the small boss and the small countersunk hole form a matching relationship. The upper tooling 31 and the adapter block 343 are connected together by screw assemblies 312312. The valve seat 22 and the support seat 21 assembly are placed between the base 36 and the adapter block 34.

[0043] The ejector pin 35 penetrates the adapter block 34, and the upper end of the ejector pin 35 is connected to the cylindrical pin 32. The lower end of the cylindrical pin 32 has a blind hole, which contains a (sealing detection device) spring 33. The upper end of the cylindrical pin 32 is connected to the ejector screw 313.

[0044] In order to prevent leakage from non-detection parts and thus affect the detected sealing parts, four sealing rings are provided on the sealing detection device, namely "O"-shaped sealing rings (37, 38, 310, 311) distributed at different positions of the sealing detection device.

[0045] By adjusting the top screw 313, the force on the steel ball 23 can be adjusted to obtain the same force conditions as the actual product. Usually, it only needs to be adjusted during the first assembly. After the adjustment, the upper tooling 31 and the adapter block 34 can be locked with screws. The top pin 35 is provided with a step to prevent it from falling off.

[0046] During the test, a certain pressure of gas is passed through the air inlet 34-1, and a leak meter is provided at the air outlet 36-1. When a leak occurs at the steel ball 23, the leak meter displays a value.

[0047] In the embodiment of the present application, a sealing test device is designed to test the sealing effect by applying the same stress conditions, thereby ensuring the integrity and accuracy of the sealing surface 22-1 and avoiding leakage problems.

[0048] In the embodiment of the present application, the sealing performance of the stretch-formed valve seat 22 is improved by embossing with a steel ball 23, and a sealing detection device for the sealing performance of the valve seat 22 after embossing is designed to ensure that the sealing quality of each valve seat 22 meets the standard. The design of the support pin 13 to prevent the valve seat 22 from deforming makes the embossing process more precise, avoiding the sealing performance problem caused by deformation during processing. The sealing accuracy and overall performance of the normally closed valve are improved, thereby ensuring the reliability of the braking effect in the wire control brake system, especially the stability and safety under working conditions such as ABS.

[0049] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and modifications of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and modifications.

Claims

1. A steel ball stamping method for a normally closed valve, the normally closed valve comprising: A support seat, a valve seat, a steel ball, a moving iron, a spring, a static iron and a magnetic isolation tube, wherein the static iron and the magnetic isolation tube, the support seat and the magnetic isolation tube are connected together by welding, the valve seat is pressed into the support seat, a steel ball is fixed on the moving iron, and a coil is provided on the outer sleeve of the magnetic isolation tube, and the moving iron can move between the valve seat and the static iron by energizing and de-energizing the coil, and is characterized in that it includes: After the valve seat is pressed into the support seat, the steel ball is pressed; The steel ball stamping is performed by using a stamping tool including a guide sleeve, a stamping head and a support pin.

2. The steel ball stamping method for a normally closed valve according to claim 1, characterized in that: The support pin is arranged on the lower seat to prevent the valve seat from deforming during the stamping process; The lower seat is used to support the valve seat and the support pin.

3. The steel ball stamping method for a normally closed valve according to claim 1, characterized in that: The pressure head applies pressure to the steel ball, thereby achieving the stamping of the steel ball on the sealing surface of the valve seat.

4. The steel ball stamping method for a normally closed valve according to claim 1, characterized in that: After the steel ball is embossed, a sealing detection device is used to perform a test; The sealing detection device comprises: an upper tooling, a transfer block, a base and an ejector pin; The ejector pin is connected to the cylindrical pin and simulates the actual stress condition through a spring.

5. A stamping tool for a normally closed valve, characterized in that: include: Guide sleeve, steel ball, support pin, lower seat and pressure head; The support pin is fixed to the lower seat to prevent the valve seat from deforming during the stamping process; The guide sleeve is used to guide the steel ball to the sealing surface of the valve seat; The steel ball is used to form an impression on the sealing surface of the valve seat; The lower seat is used to support the valve seat and the support pin; The pressure head is used to apply pressure to the steel ball so that the steel ball forms an impression on the sealing surface of the valve seat.

6. The stamping tool for a normally closed valve according to claim 5, characterized in that: The guide sleeve is arranged between the steel ball and the pressing head to guide the pressing head to accurately press the steel ball.

7. The stamping tool for a normally closed valve according to claim 6, characterized in that: The pressure head directly acts on the steel ball by applying pressure, ensuring that a uniform indentation is formed on the sealing surface.

8. A sealing detection device for a normally closed valve, the normally closed valve comprising: The valve seat and the support seat are characterized by comprising: Upper tooling, adapter block, base and ejector pin; The ejector pin is connected to the cylindrical pin and simulates the actual stress condition through a spring; The upper fixture and the adapter block are connected by screws to form a test assembly; The base is used to support the valve seat and the adapter block; The ejector pin and the cylindrical pin are used to apply simulated spring force to the steel ball; Sealing ring, used to ensure that no leakage occurs in non-testing parts; Air inlet and outlet, used to test the air tightness of the sealing performance.

9. The sealing detection device for a normally closed valve according to claim 8, characterized in that: Use "O" ring to prevent leakage in non-detection areas.

10. The sealing detection device for a normally closed valve according to claim 8, characterized in that: During the test, gas is introduced through the air inlet, and a leak meter is connected from the air outlet to monitor the sealing performance of the steel ball in real time.

Images