Relay valve for vehicle electronic brake system and vehicle electronic brake system

Abstract

The utility model provides a relay valve for a vehicle electronic braking system. The relay valve comprises a valve body, a ring seat, a valve element and a reset spring, wherein the ring seat, the valve element and the reset spring are installed in the valve body. The ring seat is fixedly installed in the valve body, a valve sleeve is integrally formed in the valve body, and the valve element and the reset spring are installed in the valve sleeve. The valve sleeve is provided with a base and a circumferential supporting wall extending from the base to the ring seat, the outer periphery of the valve element is in sliding sealing contact with the inner periphery of the supporting wall, one end of the reset spring is supported on the base of the valve sleeve, and the other end of the reset spring is supported on the ring seat. The other end of the reset spring abuts against the valve element so that the valve element can be pushed and pressed towards the ring base. According to the relay valve for the vehicle electronic braking system, the number of parts can be reduced, meanwhile, the structural design of the relay valve is simplified, and the machining and assembling complexity and cost of the relay valve are reduced. The utility model further provides a corresponding vehicle electronic braking system.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle brake systems, and in particular to a relay valve for a vehicle electronic brake system and a corresponding vehicle electronic brake system. Background Art

[0002] The relay valve is an important part of the vehicle's electronic brake system (EBS), which shortens the reaction time and pressure build-up time of multiple bridge circuits to synchronously control the brake cylinders in multiple bridge circuits. The relay valve has a brake air inlet connected to the air reservoir, a brake exhaust hole connected to each brake cylinder, and a drive air inlet connected to the brake valve. When the brake pedal is pressed, the output air pressure of the brake valve is input into the relay valve from the drive air inlet as the control pressure of the relay valve. Under the action of the brake pressure, the valve assembly is pushed open, so that the compressed air from the air reservoir can enter the corresponding brake cylinder through the brake air inlet, the valve assembly and the brake exhaust hole to achieve the braking action of the tire.

[0003] In the general design of the current relay valve, a valve sleeve for installing the valve assembly is usually integrally formed in the valve body of the relay valve. First, the valve seat as an independent part is fixedly installed on the valve sleeve, and then the valve assembly and the return spring sleeve that elastically supports the valve assembly are set on the valve seat to complete the installation of the valve assembly. In this type of design, it is necessary to open a circumferential groove on the outer peripheral wall of the valve seat, and embed the sealing ring in the circumferential groove to achieve the seal between the valve sleeve and the valve seat. In addition, there are some relay valve designs in which the valve seat and the valve body are integrally formed, in which, in order to achieve the seal between the valve assembly and the valve seat, the structures of both are usually designed to be very complex. It can be seen that the current relay valve design either leads to a large number of relay valve parts and complex assembly, or leads to a complex processing technology and high processing cost of the relay valve. Therefore, the prior art still has room for improvement in reducing the number of components of the relay valve while simplifying its processing and assembly process. Utility Model Content

[0004] The purpose of the present application is to provide a relay valve for a vehicle electronic brake system and a corresponding vehicle electronic brake system, so as to at least partially solve the above-mentioned problems existing in the prior art.

[0005] According to a first aspect of the present application, a relay valve for a vehicle electronic brake system is provided, the relay valve comprising a valve body and a ring seat, a valve core and a return spring installed in the valve body.

[0006] The ring seat is fixedly installed in the valve body, and a valve sleeve is integrally formed inside the valve body, the valve core and the return spring are installed in the valve sleeve, and

[0007] The valve sleeve is formed with a base and a circumferential support wall extending from the base toward the ring seat, the outer periphery of the valve core is in sliding sealing contact with the inner periphery of the support wall, one end of the return spring is supported on the base of the valve sleeve, and the other end of the return spring abuts against the valve core to push the valve core toward the ring seat.

[0008] In an exemplary embodiment, the valve core is formed as a whole in an annular shape and is formed with an inner core sleeve and an outer core sleeve as an integral body, the outer peripheral wall of the outer core sleeve is in sliding sealing contact with the support wall, and the other end of the return spring is located between the inner core sleeve and the outer core sleeve.

[0009] In an exemplary embodiment, at least one sealing lip is formed on the outer peripheral wall of the outer core sleeve and is in sliding sealing contact with the supporting wall.

[0010] In an exemplary embodiment, an exhaust through hole is formed at the center of the base of the valve sleeve.

[0011] In an exemplary embodiment, a ring sleeve suitable for fixedly installing the ring seat is integrally formed inside the valve body, and the inner periphery of the ring sleeve is formed with a supporting step protruding radially inward and a retaining groove recessed radially outward, a retaining spring is installed in the retaining groove, and the ring seat is clamped between the supporting step and the retaining spring.

[0012] In an exemplary embodiment, the ring seat is formed with an annular ring seat body and an abutment lip protruding radially inward from the inner circumference of the ring seat body, and in the reset state of the reset spring, the valve core is in sealing contact with the abutment lip.

[0013] In an exemplary embodiment, an annular groove is formed on the outer circumferential wall of the ring seat, a ring seat sealing ring is installed in the annular groove, and the ring seat sealing ring is radially pressed against the inner circumferential wall of the ring sleeve.

[0014] In an exemplary embodiment, the abutting lip is further formed to protrude or be inclined toward the valve core, or the abutting lip has a sealing lip edge protruding toward the valve core.

[0015] In an exemplary embodiment, a piston rod is integrally formed inside the valve body, and a pneumatic piston is slidingly and sealingly sleeved on the piston rod. The pneumatic piston is configured to be pneumatically driven to overcome the elastic force of the return spring to push the valve core away from the ring seat.

[0016] In an exemplary embodiment, the pneumatic piston is formed with a piston body and a diaphragm portion extending radially outward from the piston body, the inner circumferential surface of the piston body is in sliding and sealing contact with the piston rod, the peripheral edge of the diaphragm portion is in sliding and sealing contact with the inner circumferential surface of the valve body, a drive chamber connected to a drive air inlet channel is formed between the upper surface of the diaphragm portion and the valve body, a brake exhaust chamber connected to a brake exhaust channel is formed between the lower surface of the diaphragm portion and the ring seat, and the valve sleeve is formed in a brake inlet chamber connected to the brake inlet channel below the ring seat.

[0017] In an exemplary embodiment, a contact flange protruding toward the valve core in the axial direction is formed at a periphery of an end portion of the piston body facing the valve core.

[0018] In an exemplary embodiment, a boss is formed at the center of the end of the piston body facing the valve core, and a through hole is formed at the center of the boss.

[0019] In an exemplary embodiment, at least one through-going exhaust hole is formed on the spacer portion.

[0020] In an exemplary embodiment, a circumferentially continuous receiving groove is formed on the outer peripheral surface of the peripheral edge of the diaphragm portion, a piston sealing ring is installed in the receiving groove, and the piston sealing ring is radially slidably and sealingly pressed against the inner peripheral wall of the valve body.

[0021] In an exemplary embodiment, the valve body includes an upper valve body and a lower valve body sealingly butted against each other, the piston rod is formed on the upper valve body, the valve sleeve is formed on the lower valve body, and the ring seat is installed on the lower valve body.

[0022] According to a second aspect of the present application, a vehicle electronic braking system is provided, the vehicle electronic braking system comprising the relay valve for the vehicle electronic braking system according to the first aspect of the present application.

[0023] The beneficial effect of the present application according to the above aspects of the present application is that the number of parts of the relay valve is reduced while the structural design of the relay valve is simplified, thereby reducing the complexity and cost of processing and assembling the relay valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be described in more detail below with reference to the accompanying drawings, so that the principles, features and advantages of the present invention can be better understood. The accompanying drawings include:

[0025] Figure 1 Schematically shows a cross-sectional view of a relay valve for a vehicle electronic brake system according to an exemplary embodiment of the present application;

[0026] Figure 2The relay valve for a vehicle electronic brake system according to an exemplary embodiment of the present application is schematically shown. Figure 1 The circled part of ;

[0027] Figure 3 The relay valve for a vehicle electronic brake system according to an exemplary embodiment of the present application is schematically shown. Figure 2 The circled part of ;

[0028] Figure 4 Schematically illustrates a ring seat and a ring sleeve and surrounding parts of a relay valve for a vehicle electronic brake system according to an exemplary embodiment of the present application; and

[0029] Figure 5 The main functional parts of a relay valve for a vehicle electronic brake system according to an exemplary embodiment of the present application are schematically shown.

[0030] Reference numerals list

[0031] 1 Relay valve

[0032] 10 Valve body

[0033] 101 Upper valve body

[0034] 102 Lower valve body

[0035] 103 drive chamber

[0036] 104 Brake exhaust chamber

[0037] 105 brake air intake chamber

[0038] 11 Valve sleeve

[0039] 111 Base

[0040] 112 Support wall

[0041] 113 Exhaust hole

[0042] 12 Ring

[0043] 121 Support steps

[0044] 122 Card slot

[0045] 13 Piston rod

[0046] 20 Ring seat

[0047] 21 Ring seat body

[0048] 211 Ring groove

[0049] 22 Abutment lip

[0050] 23 Seat seal

[0051] 30 Valve core

[0052] 31 Inner core sleeve

[0053] 32 outer core sleeve

[0054] 321 Sealing lip

[0055] 40 Return spring

[0056] 50 Pneumatic piston

[0057] 51 Piston body

[0058] 511 Contact flange

[0059] 512 Boss

[0060] 513 Through hole

[0061] 52 Spacer part

[0062] 521 Exhaust Hole

[0063] 522 Receiving slot

[0064] 53 Piston seal

[0065] 60 Circlip DETAILED DESCRIPTION

[0066] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the scope of protection of the present application.

[0067] Figure 1 Schematically shows a cross-sectional view of a relay valve 1 for a vehicle electronic brake system according to an exemplary embodiment of the present application; Figure 2 The relay valve 1 for a vehicle electronic brake system according to an exemplary embodiment of the present application is schematically shown. Figure 1 The circled part of ; Figure 3 The relay valve 1 for a vehicle electronic brake system according to an exemplary embodiment of the present application is schematically shown. Figure 2 The circled part of ; Figure 4 Schematically shows a ring seat 20 and a ring sleeve 12 and surrounding parts of a relay valve 1 for a vehicle electronic brake system according to an exemplary embodiment of the present application; and Figure 5Main functional parts of a relay valve 1 for a vehicle electronic brake system according to an exemplary embodiment of the present application are schematically shown.

[0068] like Figure 1 As shown, a relay valve 1 for a vehicle electronic brake system according to an exemplary embodiment of the present application includes a valve body 10 and a ring seat 20, a valve core 30, a return spring 40 and a pneumatic piston 50 installed in the valve body 10. The valve body 10 includes an upper valve body 101 and a lower valve body 102 that are sealed and butted against each other, the pneumatic piston 50 is installed on the upper valve body 101, and the ring seat 20, the valve core 30 and the return spring 40 are installed on the lower valve body 102, whereby the internal space of the valve body 10 is generally divided into three chambers by the ring seat 20 and the pneumatic piston 50, namely, a driving chamber 103 between the pneumatic piston 50 and the valve body 10, namely, the upper valve body 101, a brake exhaust chamber 104 between the pneumatic piston 50 and the ring seat 20, and a brake air intake chamber 105 below the ring seat 20, namely, between the ring seat 20 and the lower valve body 102. The driving chamber 103 is communicated with the driving air inlet through a driving air inlet not shown, the brake exhaust chamber 104 is communicated with the brake exhaust passage through a brake exhaust hole not shown, and the brake air inlet chamber 105 is communicated with the brake air inlet passage through a brake air inlet hole not shown. The valve core 30 and the return spring 40 are located in the brake air inlet chamber 105 below the ring seat 20. The valve core 30 abuts against the ring seat 20 under the elastic restoring force of the return spring 40, thereby blocking the fluid communication between the brake air inlet chamber 105 and the brake air exhaust chamber 104, and the relay valve 1 is closed at this time.

[0069] When the brake pedal is depressed, the output air pressure of the brake valve (not shown) is input into the driving chamber 103 of the relay valve 1 via the driving air inlet passage and the driving air inlet port as the control pressure of the relay valve 1, driving the pneumatic piston 50 to move downward and come into contact with the valve core 30, and then the pneumatic piston 50 overcomes the elastic force of the return spring 40 to push the valve core 30 away from the ring seat 20, thereby opening the relay valve 1 so that the compressed air from the air reservoir can enter the corresponding brake exhaust passage via the brake air inlet chamber 105, the passage between the ring seat 20 and the valve core 30, and the brake exhaust chamber 104 and reach the brake cylinder to achieve the braking action of the tire. After the brake pedal is released, the brake valve stops supplying the output air pressure, so the compressed air from the air reservoir entering the brake exhaust chamber 104 via the brake air inlet chamber 105 drives the pneumatic piston 50 to move upward, and the return spring 40 also pushes the valve core 30 to move upward, and finally the pneumatic piston 50 leaves the valve core 30, and the valve core 30 abuts against the ring seat 20 again to close the air passage, and the relay valve 1 resumes closing.

[0070] like Figure 1 and Figure 2As shown, in a relay valve 1 for a vehicle electronic brake system according to an exemplary embodiment of the present application, the valve body 10, especially the lower valve body 102, has a valve sleeve 11 and a ring sleeve 12 integrally formed therewith inside, the ring seat 20 is fixedly mounted on the ring sleeve 12, and the valve core 30 and the return spring 40 are installed in the valve sleeve 11.

[0071] The valve sleeve 11 is formed with a base 111 and a circumferential support wall 112 extending from the base 111 toward the ring seat 20, and a venting through hole 113 is formed in the center of the base 111 of the valve sleeve 11. In the installed state, the outer periphery of the valve core 30 is in sliding and sealing contact with the inner periphery of the support wall 112. Figure 2 and 3 As shown, the valve core 30 is formed into a double ring shape by a metal molded part as a skeleton and a rubber tightly surrounding the outside of the metal molded part, wherein the valve core 30 has an inner core sleeve 31 as an inner ring and an outer core sleeve 32 as an outer ring, and the inner core sleeve 31 and the outer core sleeve 32 are integrally connected at one axial end (the upper end in the figure) of the valve core 30. The outer peripheral wall of the rubber material of the outer core sleeve 32 is in sliding sealing contact with the support wall 112, wherein the outer peripheral wall of the outer core sleeve 32 is formed with at least one sealing lip 321 that is in sliding sealing contact with the support wall 112, as shown in FIG. Figure 3 The three sealing lips 321 are shown as examples. An annular accommodating space is formed between the inner core sleeve 31 and the outer core sleeve 32. The radial inner part of the inner core sleeve 31 is formed as a through passage, which can be used as an exhaust passage. One end of the return spring 40 is supported on the base 111 of the valve sleeve 11, and the other end thereof extends into the accommodating space between the inner core sleeve 31 and the outer core sleeve 32 and abuts against the valve core 30, and the return spring 40 is installed in a compressed state, that is, its reset state is also a compressed state, so the return spring 40 pushes the valve core 30 toward the ring seat 20 through its own elastic recovery effect in the reset state. Note that the sliding seal described in this article is a well-known sealing method for preventing liquid or gas, in this article particularly gas, from leaking between two parts that rotate or translate relative to each other, and a more specific implementation method is not repeated here. By means of the simpler and more effective design and installation of the valve sleeve 11 and the valve core 30 , the need for an additional valve seat and a corresponding sealing device can be omitted, that is, the number of components is reduced, while the complexity of processing and assembly is reduced, thereby saving corresponding costs.

[0072] like Figure 4As shown, the inner circumference of the ring sleeve 12 is formed with a support step 121 protruding radially inward and a clamping groove 122 concave radially outward, and a clamping spring 60 is installed in the clamping groove 122, so that the ring seat 20 can be sandwiched and installed between the support step 121 and the clamping spring 60. The ring seat 20 is formed with an annular ring seat body 21 and an abutting lip 22 protruding radially inward from the inner circumference of the ring seat body 21. In the reset state of the reset spring 40, the valve core 30 is in sealing contact with the abutting lip 22. In a preferred embodiment, the abutting lip 22 can also be formed to protrude radially inward while protruding downward toward the valve core 30 or inclined toward the valve core 30, or can have a sealing lip edge protruding toward the valve core 30, so as to better achieve sealing contact with the valve core 30. In addition, an annular groove 211 is formed on the outer circumferential wall of the ring seat 20, that is, the outer circumferential wall of the ring seat body 21, and a ring seat sealing ring 23 is installed in the annular groove 211. The ring seat sealing ring 23 radially presses against the inner circumferential wall of the ring sleeve 12, thereby providing a gas seal between the ring seat 20 and the ring sleeve 12.

[0073] like Figure 5 As shown, the valve body 10, especially the upper valve body 101, has a piston rod 13 integrally formed therewith, and the pneumatic piston 50 is slidingly and sealingly sleeved on the piston rod 13. The pneumatic piston 50 is formed with a piston body 51 and a diaphragm portion 52 extending radially outward from the piston body 51.

[0074] The inner peripheral surface of the piston body 51 is in sliding sealing contact with the piston rod 13, and the piston body 51 contacts and pushes against the valve core 30 with its lower end facing the valve core 30. Figure 4 As better shown in FIG. 1 , a contact flange 511 protruding axially toward the valve core 30 may be formed at the periphery of the lower end of the piston body 51, so as to achieve a sealed contact with the valve core 30 and prevent the compressed gas from escaping through the central channel of the inner core sleeve 31 and the exhaust through hole 113 of the valve sleeve 11. In addition, a boss 512 may be formed at the center of the lower end of the piston body 51, and a through hole 513 is formed at the center of the boss 512, so as to smoothly discharge the gas between the piston body 51 and the piston rod 13 when the pneumatic piston 50 moves upward. After the pneumatic piston 50 leaves the valve core 30, the excess compressed gas may be discharged from the central channel of the inner core sleeve 31 and the exhaust through hole 113 of the valve sleeve 11.

[0075] The periphery of the diaphragm portion 52 is in sliding sealing contact with the inner circumference of the valve body 10, especially the upper valve body 101, thereby separating the upper drive chamber 103 and the lower brake exhaust chamber 104. Specifically, a circumferentially continuous receiving groove 522 is formed on the outer circumferential surface of the periphery of the diaphragm portion 52, and a piston seal ring 53 is installed in the receiving groove 522. The piston seal ring 53 is radially pressed against the inner circumferential wall of the valve body 10 in a sliding sealing manner, thereby providing a sliding sealing contact between the diaphragm portion 52 and the inner circumferential surface of the upper valve body 101. At least one through exhaust hole 521 is formed on the diaphragm portion 52, so that when the pneumatic piston 50 is moved upward, the remaining gas in the drive chamber 103 is smoothly discharged through the exhaust hole 521, so that the pneumatic piston 50 can return to the position when the relay valve 1 is closed.

[0076] The present application also provides a vehicle electronic brake system, which includes a relay valve 1 for a vehicle electronic brake system according to an exemplary embodiment of the present application.

[0077] Although the specific embodiments of the present application are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present application. Various substitutions, changes and modifications may be conceived without departing from the spirit and scope of the present application.

Claims

1. A relay valve for a vehicle electronic brake system, characterized in that: The relay valve (1) comprises a valve body (10), a ring seat (20), a valve core (30) and a return spring (40) installed in the valve body (10). The ring seat (20) is fixedly installed in the valve body (10), and a valve sleeve (11) is integrally formed inside the valve body (10), the valve core (30) and the return spring (40) are installed in the valve sleeve (11), and The valve sleeve (11) is formed with a base (111) and a circumferential support wall (112) extending from the base (111) toward the ring seat (20), the outer periphery of the valve core (30) is in sliding sealing contact with the inner periphery of the support wall (112), one end of the return spring (40) is supported on the base (111) of the valve sleeve (11), and the other end of the return spring (40) abuts against the valve core (30) to push the valve core (30) toward the ring seat (20).

2. The relay valve for a vehicle electronic brake system according to claim 1, characterized in that: The valve core (30) is formed as a whole in an annular shape and is formed with an inner core sleeve (31) and an outer core sleeve (32) as an integral body, the outer peripheral wall of the outer core sleeve (32) is in sliding sealing contact with the support wall (112), and the other end of the return spring (40) is located between the inner core sleeve (31) and the outer core sleeve (32).

3. The relay valve for a vehicle electronic brake system according to claim 2, characterized in that: At least one sealing lip (321) is formed on the outer peripheral wall of the outer core sleeve (32) and is in sliding sealing contact with the support wall (112); and / or An exhaust through hole (113) is formed in the center of the base (111) of the valve sleeve (11).

4. The relay valve for a vehicle electronic brake system according to any one of claims 1 to 3, characterized in that: The valve body (10) is also integrally formed with a ring sleeve (12) suitable for fixedly mounting the ring seat (20), the inner periphery of the ring sleeve (12) is formed with a radially inwardly protruding supporting step (121) and a radially outwardly recessed retaining groove (122), a retaining spring (60) is installed in the retaining groove (122), and the ring seat (20) is sandwiched between the supporting step (121) and the retaining spring (60); and / or The ring seat (20) is formed with an annular ring seat body (21) and an abutment lip (22) protruding radially inward from the inner circumference of the ring seat body (21). When the return spring (40) is in a reset state, the valve core (30) is in sealing contact with the abutment lip (22).

5. The relay valve for a vehicle electronic brake system according to claim 4, characterized in that: An annular groove (211) is formed on the outer peripheral wall of the ring seat (20), a ring seat sealing ring (23) is installed in the annular groove (211), and the ring seat sealing ring (23) is radially pressed against the inner peripheral wall of the ring sleeve (12); and / or The abutting lip (22) is also formed to protrude or be inclined toward the valve core (30), or the abutting lip (22) has a sealing lip edge protruding toward the valve core (30).

6. The relay valve for a vehicle electronic brake system according to any one of claims 1 to 3 and 5, characterized in that: A piston rod (13) is also integrally formed inside the valve body (10), and a pneumatic piston (50) is slidably and sealingly sleeved on the piston rod (13). The pneumatic piston (50) is configured to be suitable for being pneumatically driven to overcome the elastic force of the return spring (40) to push the valve core (30) away from the ring seat (20).

7. The relay valve for a vehicle electronic brake system according to claim 6, characterized in that: The pneumatic piston (50) is formed with a piston body (51) and a diaphragm portion (52) extending radially outward from the piston body (51); the inner circumferential surface of the piston body (51) is in sliding sealing contact with the piston rod (13); the peripheral edge of the diaphragm portion (52) is in sliding sealing contact with the inner circumferential surface of the valve body (10); a driving chamber (103) connected to a driving air inlet channel is formed between the upper surface of the diaphragm portion (52) and the valve body (10); a brake exhaust chamber (104) connected to a brake exhaust channel is formed between the lower surface of the diaphragm portion (52) and the ring seat (20); and the valve sleeve (11) is formed in a brake intake chamber (105) connected to the brake intake channel below the ring seat (20).

8. The relay valve for a vehicle electronic brake system according to claim 7, characterized in that: A contact flange (511) is formed at the periphery of the end of the piston body (51) facing the valve core (30) and protrudes axially toward the valve core (30); A boss (512) is formed at the center of the end of the piston body (51) facing the valve core (30), and a through hole (513) is formed at the center of the boss (512); At least one through-going exhaust hole (521) is formed on the spacer portion (52); and / or A circumferentially continuous receiving groove (522) is formed on the outer peripheral surface of the peripheral edge of the diaphragm portion (52), and a piston sealing ring (53) is installed in the receiving groove (522). The piston sealing ring (53) radially slides and seals against the inner peripheral wall of the valve body (10).

9. The relay valve for a vehicle electronic brake system according to claim 6, characterized in that: The valve body (10) comprises an upper valve body (101) and a lower valve body (102) which are sealed and butted against each other, the piston rod (13) is formed on the upper valve body (101), the valve sleeve (11) is formed on the lower valve body (102), and the ring seat (20) is installed on the lower valve body (102).

10. A vehicle electronic braking system, characterized in that: The vehicle electronic brake system comprises a relay valve (1) for a vehicle electronic brake system according to any one of claims 1 to 9.

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