A double relay valve for a full hydraulic brake system

Abstract

The present invention discloses a double relay valve for a full hydraulic brake system, comprising a cover plate, a pressure plate, a first valve body and a second valve body which are arranged in sequence from left to right, the cover plate, the pressure plate and the first valve body are fixedly connected, and the first valve body and the second valve body are fixedly connected; two main cavity holes are arranged inside the first valve body, one of the main cavity holes is provided with a valve sleeve, a spring seat, a first spring, a second spring, a sleeve, a first valve core, a push rod plunger, a second valve core and a third spring, the two main cavity holes are arranged in the same manner as the internal arrangement of one of the main cavity holes, different relay valves are adopted, and the relay valve reacts quickly to increase the braking pressure ratio and then transmit it to the braking mechanism, so that the brake can obtain the corresponding braking pressure and flow as required, and avoid the pressure drop caused by the long pipeline, resulting in insufficient braking force and braking delay, which affects the driving safety, and has the advantages of high safety factor, low cost and rapid response.

Description

Technical Field

[0001] The invention relates to the technical field of relay valves, and in particular to a double relay valve of a full hydraulic brake system. Background Art

[0002] Mining dump trucks are widely used in large open-pit mine transportation operations due to their high operating efficiency and relatively low operating costs. However, due to the heavy weight of mining dump trucks, the weight after full load is even greater, up to several hundred tons, and the high travel speed, up to about 60km / h, the travel environment and road conditions are relatively bad, and the braking is frequent, which requires the braking system of the dump truck to be very safe and reliable. The traditional air brake system cannot meet its use requirements at all.

[0003] The full hydraulic brake system has many advantages such as using the main engine power source, high braking pressure, fast response speed, and more reliable braking effect. It has been widely used in wheeled engineering machinery. The use of a full hydraulic brake system is the best choice for mining dump trucks. However, due to the large size of mining dump trucks and the long distance from the cab to each wheel hub, the pressure from the brake pedal (or handle) to the brake actuator when using full hydraulic braking will cause a pressure drop due to the long pipeline, resulting in insufficient braking force, and will cause braking delays, affecting driving safety. In addition, due to the large flow required for braking of mining dump trucks, the front and rear brake pressures and flows are also quite different. Therefore, using only the brake pedal valve in the full hydraulic brake system cannot meet the use requirements of large engineering walking machinery such as mining dump trucks. Summary of the invention

[0004] In view of this, the present invention proposes a full hydraulic brake system with double relay valves, which adopt different relay valves and quickly respond through the relay valves to increase the braking pressure ratio before transmitting it into the brake mechanism, so that the brake can obtain the corresponding braking pressure and flow as required, avoiding the pressure drop caused by the long pipeline, resulting in insufficient braking force and braking delay, affecting driving safety, and having the advantages of high safety factor, low cost and rapid response.

[0005] On the one hand, the present invention provides a full hydraulic brake system double relay valve, comprising a cover plate, a pressure plate, a first valve body and a second valve body arranged in sequence from left to right, wherein the cover plate, the pressure plate and the first valve body are fixedly connected, and the first valve body and the second valve body are fixedly connected;

[0006] Two main cavity holes are arranged inside the first valve body, a valve sleeve, a spring seat, a first spring, a second spring and a sleeve are installed in one of the main cavity holes, one end of the valve sleeve is connected to the pressure plate, and the other end thereof is connected to one end of the spring seat through the first valve core, and the other end of the spring seat is connected to the sleeve through a push rod plunger, the push rod plunger is arranged in the inner hole of the sleeve, the first spring and the second spring are coaxially sleeved on the spring seat, the radial diameter of the second spring is larger than the radial diameter of the first spring, the first valve core is installed in the interior of the valve sleeve, the second valve core and the third spring are arranged in the inner cavity of the first valve core, one end of the second valve core is against the pressure plate, and the other end thereof is in contact with the third spring; the interior arrangement of the two main cavity holes is the same as that of one of the main cavity holes;

[0007] A control oil passage PX is provided on the second valve body, and the push rod plunger is communicated with the control oil passage PX. A valve sleeve installed in one of the main chamber holes is provided with a B1 port and a P1 port, and a valve sleeve installed in another of the main chamber holes is provided with a B2 port and a P1 port. A T port is provided inside the first valve body: when pressure oil enters the P1 port, the B1 port and the B2 port are communicated with the T port respectively; when pressure oil enters the control oil passage PX, the B1 port and the B2 port are communicated with the P1 port respectively, and are not communicated with the T port.

[0008] Furthermore, the full hydraulic brake system dual relay valve also includes a first O-ring and a rectangular sealing ring, the rectangular sealing ring is arranged on the annular contact surface between the pressure plate and the first valve body, and the first O-ring is arranged on the annular contact surface between the second valve body and the first valve body.

[0009] Furthermore, a first annular sealing groove is arranged on the contact surface where the sleeve is connected to the first valve body, and a second O-ring and a first retaining ring are arranged in the first annular sealing groove.

[0010] Furthermore, at least two shoulders with different outer circle sizes are radially arranged on the valve sleeve, each shoulder is provided with a second annular sealing groove, and each second annular sealing groove is provided with a third retaining ring and a fourth O-ring.

[0011] Furthermore, the cross-sectional areas of the second valve core and the push rod plunger are configured to be in different proportions according to the magnitude of the braking force.

[0012] Furthermore, the internal arrangement of two of the main cavity holes is symmetrical to the internal arrangement of one of the main cavity holes about an axis extending along the left-right direction of the first valve body.

[0013] Furthermore, an annular groove a is provided on the pressure plate, which is used to connect the left cavity d of the valve sleeve installed in the two main cavity holes and to connect with the oil drain hole L provided on the first valve body, and the oil drain hole L is connected with the T port.

[0014] Furthermore, an oil hole c and an inner cavity b1 are provided on the first valve core arranged in one of the main cavity holes, and an oil hole c and an inner cavity b2 are provided on the first valve core arranged in the second main cavity hole, and the pressure oil at ports B1 and B2 respectively enters the inner cavities b1 and b2 of the first valve core through the oil hole c.

[0015] Furthermore, the full hydraulic brake system dual relay valve also includes a first screw and a second screw, the second valve body is connected to the first valve body through the first screw, and the second screw connects the cover plate and the pressure plate to the first valve body.

[0016] Furthermore, the full hydraulic brake system dual relay valve also includes a first spring washer and a second spring washer: the first spring washer is fixed on the right end surface of the second valve body by a first screw; the second spring washer is fixed on the left end surface of the cover plate by a second screw.

[0017] The double relay valve of the full hydraulic brake system provided by the present invention comprises a cover plate, a pressure plate, a first valve body, a second valve core, a first valve core, a third spring, a spring seat, a first spring, a second spring, a push rod plunger, a sleeve, a second valve body, and a valve sleeve. The double relay valve can quickly respond through the relay valve to proportionally transmit high-pressure and large-flow brake hydraulic oil to the front and rear brakes. Different relay valves can be used according to the different brake pressures of the front and rear wheels to increase the brake pressure ratio before transmitting it to the brake mechanism, so that the brake can obtain the corresponding brake pressure and flow as required, avoiding pressure drop due to too long a pipeline, resulting in insufficient braking force and braking delay, affecting driving safety, and having the advantages of high safety factor, low cost and rapid response. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of the structure of a double relay valve of a full hydraulic brake system provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a dual relay valve of a full hydraulic brake system provided in an embodiment of the present invention.

[0021] Wherein: 1-cover plate, 2-pressure plate, 3-first valve body, 4-second valve core, 5-first valve core, 6-third spring, 7-spring seat, 8-first spring, 9-second spring, 10-push rod plunger, 11-sleeve, 12-first plug, 13-first screw, 14-first spring washer, 15-second plug, 16-second valve body, 17-first O-type sealing ring, 18-second O-type sealing ring, 19-first retaining ring, 20-third O-type sealing ring, 21-second retaining ring, 22-fourth O-type sealing ring, 23-third retaining ring, 24-valve sleeve, 25-fifth O-type sealing ring, 26-rectangular sealing ring, 27-second screw, 28-second spring washer. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In the present invention, the terms "left", "right", "top", "bottom", "inside", "outside", "upper", "lower" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or position relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention; at the same time, the terms "first" and "second" are mainly used to distinguish different components, but do not impose specific limitations on the components.

[0024] Figure 1 It is a structural schematic diagram of a double relay valve of a full hydraulic brake system provided by an embodiment of the present invention.

[0025] Figure 2 A schematic diagram of a dual relay valve of a full hydraulic brake system provided in an embodiment of the present invention.

[0026] like Figure 1 and Figure 2As shown, a double relay valve of a full hydraulic brake system is provided with a cover plate 1, a pressure plate 2, a first valve body 3 and a second valve body 16 from left to right. The cover plate 1, the pressure plate 2 and the first valve body 3 are fixedly connected, and the first valve body 3 and the second valve body 16 are fixedly connected: specifically, two main cavity holes are provided inside the first valve body 3, and a valve sleeve 24, a spring seat 7, a first spring 8, a second spring 9 and a sleeve 11 are installed in one of the main cavity holes. The left end of the valve sleeve 24 is connected to the pressure plate 2, and the right end thereof is connected to the first valve core 5. The first valve core 5 is connected to the left end of the spring seat 7, the right end of the first valve core 5 is preferably engaged with the left end of the spring seat 7, the right end of the spring seat 7 is connected to the sleeve 11 through the push rod plunger 10, and the push rod plunger 10 is arranged in the inner hole of the sleeve 11. The first spring 8 and the second spring 9 are coaxially sleeved on the spring seat 7, and the second spring 9 is used for limiting, and its radial diameter is larger than the radial diameter of the first spring 8. The first valve core 5 is installed in the interior of the valve sleeve 24, and the second valve core 4 and the third valve core 4 are arranged in the inner cavity of the first valve core 5. Spring 6, the third spring 6 is used for resetting, one end of the second valve core 4 is against the pressure plate 2, and the other end thereof is in contact with the third spring 6; the internal arrangement of the two main chamber holes is the same as that of one of the main chamber holes, that is, the valve sleeve 24, spring seat 7, first spring 8, second spring 9, sleeve 11, first valve core 5, push rod plunger 10, second valve core 4 and third spring 6 are also installed in the two main chamber holes, and the above-mentioned components are exactly the same as those of one of the main chamber holes; at the same time, the second valve The body 16 is provided with a control oil passage PX, and the push rod plunger 10 is connected to the control oil passage PX. The valve sleeve 24 installed in one of the main chamber holes is provided with a B1 port and a P1 port, and the valve sleeve 24 installed in the second main chamber hole is provided with a B2 port and a P1 port. The first valve body 3 is provided with a T port inside: when the P1 port enters the pressure oil, the B1 port and the B2 port are respectively connected to the T port; when the control oil passage PX enters the pressure oil, the B1 port and the B2 port are respectively connected to the P1 port, and are not connected to the T port. Preferably, the internal setting of the second main chamber holes and the internal setting of one of the main chamber holes in the present invention are symmetrically arranged with respect to the axis extending in the left-right direction of the first valve body 3. It should be noted that the cross-sectional area of ​​the second valve core 4 and the push rod plunger 10 is used to be set to different proportions according to the braking force.

[0027] In a further technical solution, the above-mentioned full hydraulic brake system double relay valve further includes a first screw 13, a first spring washer 14, a second screw 27 and a second spring washer 28. The second valve body 16 is connected to the first valve body 3 through the first screw 13. The first spring washer 14 is fixedly arranged on the right end face of the second valve body 16 through the first screw 13. Meanwhile, the second screw 27 connects the cover plate 1 and the pressure plate 2 to the first valve body 3. The second spring washer 28 is fixedly arranged on the left end face of the cover plate 1 through the second screw 27. Preferably, the length of the first screw 13 is greater than that of the second screw 27. It should be noted that a plurality of plugs are arranged on the second valve body 16 to block the redundant pipe openings in the second valve body 16. Specifically, a first plug 12 is arranged at the bottom of the second valve body 16, and a second plug 15 is arranged on the right end face thereof.

[0028] At the same time, in order to improve the sealing performance of the double relay valve, Figure 1 As shown, a dual relay valve for a full hydraulic brake system of the present invention further includes a first O-ring 17, a rectangular sealing ring 26, a second O-ring 18 and a first retaining ring 19. The rectangular sealing ring 26 is arranged on the annular contact surface between the pressure plate 2 and the first valve body 3, the first O-ring 17 is arranged on the annular contact surface between the second valve body 16 and the first valve body 3, and the second O-ring 18 and the first retaining ring 19 are installed in a first annular sealing groove arranged on the contact surface where the sleeve 11 is connected to the first valve body 3.

[0029] As a preferred embodiment of the present invention, at least two shoulders with different outer circle sizes are radially arranged on the valve sleeve 24, each shoulder is provided with a second annular sealing groove, and each second annular sealing groove is provided with a third retaining ring 23 and a fourth O-ring 22 for preventing the pressure oil from penetrating through the contact surface between the valve sleeve 24 and the valve body 3.

[0030] In addition, such as Figure 1 As shown, an annular groove a is provided on the pressure plate 2, which is used to connect the left cavity d of the valve sleeve 24 installed in the two main cavity holes, and is connected to the oil drain hole L provided on the first valve body 3, and the oil drain hole L is connected to the T port; at the same time, as shown Figure 1 As shown, an oil hole c and an inner cavity b1 are provided on the first valve core 5 arranged in one of the main cavity holes, and an oil hole c and an inner cavity b2 are provided on the first valve core 5 arranged in the second main cavity hole. The pressure oil at ports B1 and B2 enters the inner cavities b1 and b2 of the first valve core 5 respectively through the oil hole c.

[0031] The working principle of the relay valve of the aforementioned full hydraulic brake system is briefly described as follows: When pressure oil enters the P1 port, all components are kept in the middle position, the P1 pressure oil is cut off at the outside of the large valve core 5, the working ports B1 and B2 are connected to the T port, the brake actuator is in a pressure relief state, and the brake mechanism does not work; when pressure oil enters the PX control port, the push rod plunger 10 starts to move under the action of the pressure oil, and transmits the force to the first valve core 5 through the first spring 8, and the first valve core 5 moves to the left. When the first valve core 5 moves to the P1 port pressure connection position (that is, when the throttle port on the first valve core 5 is connected to the P1 port), the B1, B2 ports and the T port have been cut off in advance, and the pressure is cut off at the first valve core 5. The pressure oil at the outer P1 port enters the B1 and B2 ports, and the pressure oil at the B1 and B2 ports enters the inner cavity b1 and b2 of the first valve core 5 through the oil hole c on the first valve core 5, so that the first valve core 5 generates a rightward force to balance the force transmitted by PX on the second valve body 16, and B1 and B2 begin to output pressure oil; at the same time, since an annular groove a is provided on the pressure plate 2, it is connected to the cavity d on the left side of the valve sleeve 24 and is connected to the oil leakage hole L provided on the first valve body 3. The leakage oil generated by the cooperation between the first valve core 5 and the second valve core 4 and the valve sleeve 24 can be connected to the L port through the a groove and leak into the T port, thereby keeping the pressure of the second valve core 4 and the left side cavity of the first valve core 5 at zero, thereby ensuring accurate control of pressure and flow.

[0032] In addition, it should be mentioned that in the present invention, the output pressure of ports B1 and B2 can be proportionally enlarged or reduced with the input pressure of PX, and is linearly proportional to the input pressure signal of port PX. At the same time, the cross-sectional diameter of the first valve core 5 can be set, and the braking flow rate of ports B1 and B2 input by the hydraulic oil of port P1 can be different to achieve rapid braking response without delay, thereby meeting the different pressure requirements of the front and rear wheels due to different braking torques.

[0033] In summary, the present invention quickly responds through the relay valve to proportionally transmit high-pressure and high-flow brake hydraulic oil to the front and rear brakes, and can use different relay valves according to the different braking pressures of the front and rear wheels to increase the braking pressure ratio before transmitting it to the braking mechanism, so that the brake can obtain the corresponding braking pressure and flow as required, avoiding the pressure drop caused by too long pipes in the braking system, resulting in insufficient braking force and affecting driving safety, and can convert the braking pressure as needed to meet the needs of using different pressures for the front and rear wheels due to different braking torques, and has the advantages of high safety factor, low cost and rapid response.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A double relay valve for a full hydraulic brake system, characterized in that: The valve body comprises a cover plate (1), a pressure plate (2), a first valve body (3) and a second valve body (16) which are arranged in sequence from left to right, wherein the cover plate (1), the pressure plate (2) and the first valve body (3) are fixedly connected, and the first valve body (3) and the second valve body (16) are fixedly connected; Two main cavity holes are arranged inside the first valve body (3), and a valve sleeve (24), a spring seat (7), a first spring (8), a second spring (9) and a sleeve (11) are installed in one of the main cavity holes. One end of the valve sleeve (24) is connected to the pressure plate (2), and the other end is connected to one end of the spring seat (7) through the first valve core (5). The other end of the spring seat (7) is connected to the sleeve (11) through a push rod plunger (10). The push rod plunger (10) is arranged in the inner hole of the sleeve (11). A spring (8) and a second spring (9) are coaxially sleeved on a spring seat (7); the radial diameter of the second spring (9) is larger than the radial diameter of the first spring (8); the first valve core (5) is installed inside a valve sleeve (24); a second valve core (4) and a third spring (6) are arranged in an inner cavity of the first valve core (5); one end of the second valve core (4) is abutted against a pressure plate (2), and the other end thereof is in contact with the third spring (6); the two main cavity holes are arranged identically to the inner configuration of one of the main cavity holes; The second valve body (16) is provided with a control oil passage PX, the push rod plunger (10) is connected to the control oil passage PX, a valve sleeve (24) installed in one of the main chamber holes is provided with a B1 port and a P1 port, a valve sleeve (24) installed in another of the main chamber holes is provided with a B2 port and a P1 port, and a T port is provided inside the first valve body (3): when pressure oil enters the P1 port, the B1 port and the B2 port are respectively connected to the T port; when pressure oil enters the control oil passage PX, the B1 port and the B2 port are respectively connected to the P1 port and are not connected to the T port.

2. The full hydraulic brake system double relay valve according to claim 1, characterized in that: It also includes a first O-type sealing ring (17) and a rectangular sealing ring (26), wherein the rectangular sealing ring (26) is arranged on the annular contact surface between the pressure plate (2) and the first valve body (3), and the first O-type sealing ring (17) is arranged on the annular contact surface between the second valve body (16) and the first valve body (3).

3. The full hydraulic brake system double relay valve according to claim 2, characterized in that: A first annular sealing groove is provided on the contact surface where the sleeve (11) is connected to the first valve body (3), and a second O-type sealing ring (18) and a first retaining ring (19) are arranged in the first annular sealing groove.

4. The full hydraulic brake system double relay valve according to claim 3, characterized in that: At least two shoulders with different outer circle sizes are radially arranged on the valve sleeve (24), each shoulder is provided with a second annular sealing groove, and each second annular sealing groove is provided with a third retaining ring (23) and a fourth O-ring (22).

5. The full hydraulic brake system double relay valve according to claim 1, characterized in that: The cross-sectional areas of the second valve core (4) and the push rod plunger (10) are used to be set in different proportions according to the magnitude of the braking force.

6. The full hydraulic brake system double relay valve according to any one of claims 1 to 5, characterized in that: The internal arrangement of two of the main cavity holes and the internal arrangement of one of the main cavity holes are symmetrically arranged about an axis extending along the left-right direction of the first valve body (3).

7. The full hydraulic brake system double relay valve according to claim 6, characterized in that: The pressure plate (2) is provided with an annular groove a for connecting the left cavity d of the valve sleeve (24) installed in the two main cavity holes and connecting with the oil drain hole L provided on the first valve body (3), and the oil drain hole L is connected with the T port.

8. The full hydraulic brake system double relay valve according to claim 7, characterized in that: An oil hole c and an inner cavity b1 are formed on the first valve core (5) arranged in one of the main cavity holes, and an oil hole c and an inner cavity b2 are formed on the first valve core (5) arranged in the other main cavity holes. Pressure oil at ports B1 and B2 enters the inner cavities b1 and b2 of the first valve core (5) respectively through the oil hole c.

9. The full hydraulic brake system double relay valve according to claim 1, characterized in that: It also includes a first screw (13) and a second screw (27), wherein the second valve body (16) is connected to the first valve body (3) via the first screw (13), and the second screw (27) connects the cover plate (1) and the pressure plate (2) to the first valve body (3).

10. The full hydraulic brake system double relay valve according to claim 9, characterized in that: It also includes a first spring washer (14) and a second spring washer (28): the first spring washer (14) is fixedly arranged on the right end surface of the second valve body (16) by a first screw (13); the second spring washer (28) is fixedly arranged on the left end surface of the cover plate (1) by a second screw (27).

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