Parking Brake Interlock Module

Abstract

The present invention relates to the technical field of parking brakes, in particular to a parking brake interlock module, which includes a high-pressure cock, an adjusting spring, a supercharging valve core, a main valve core, a sealing ball, a high-temperature resistant O-ring, a pressure regulating spring, an adjusting screw, a jam nut, a spring valve seat, a main valve seat, and a valve body. The parking brake interlock module of the present invention can set the working pressure according to different system pressure requirements, making the system design more diversified; it more effectively protects the parking brake, enables the parking brake and the release of the parking brake to work more stably, ensures the safety during the vehicle driving process, and greatly extends the service life of the parking brake. The hydraulic system circuit is highly integrated, greatly reducing the vehicle layout space; an internal threaded assembly blind hole for installing an external self-closing locking mechanism is provided at the opening position outside the liquid guide hole, which can achieve the self-closing effect during disassembly, reducing the later maintenance and use costs.

Description

Technical Field

[0001] The present invention relates to the technical field of parking brakes, and particularly to an interlock module for a parking brake. Background Art

[0002] Parking brakes such as those on mining trucks are controlled by a hydraulic system. The system pressure oil enters the parking brake through a hydraulic pipeline, and the pressure energy is converted into mechanical energy to overcome the work of the disc spring of the parking brake. At this time, the hydraulic pressure is greater than the spring force, and the disc spring is compressed, and the parking brake is in a non-working state. This is reflected in the vehicle as the parking release, and the vehicle can then drive normally.

[0003] Currently, existing designs all control the oil to directly enter the parking brake, thereby realizing the working conditions of parking braking and releasing the parking brake. During the normal driving of the vehicle, it is necessary to ensure that the parking brake is always in the released state, which requires the hydraulic pressure that does work on it to be stable and not fluctuate due to external factors. If the hydraulic pressure is less than the spring force under certain circumstances due to external factors, then under the action of the spring force, the parking brake is in a critical state of release. At this time, the friction layer will come into contact with the brake disc, and the temperature of the parking brake will rise rapidly due to friction. In severe cases, faults such as the friction layer falling off and the steel sheet warping and breaking will occur, resulting in abnormal temperatures of the system and the brake, and then failures such as the parking brake failure. At the same time, the difficulty of later loading, unloading and maintenance is relatively large, and the later use cost is high. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide an improved interlock module for a parking brake to solve the problem that if the hydraulic pressure is less than the spring force under certain circumstances due to external factors, then under the action of the spring force, the parking brake is in a critical state of release. At this time, the friction layer will come into contact with the brake disc, and the temperature of the parking brake will rise rapidly due to friction. In severe cases, faults such as the friction layer falling off and the steel sheet warping and breaking will occur, resulting in abnormal temperatures of the system and the brake, and then failures such as the parking brake failure. At the same time, the difficulty of later loading, unloading and maintenance is relatively large, and the later use cost is high.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a parking brake interlock module, including a high-pressure cock, an adjusting spring, a pressure-boosting valve core, a main valve core, a sealing ball, a high-temperature-resistant O-ring, a pressure-regulating spring, an adjusting screw, a locking nut, a spring valve seat, a main valve seat, and a valve body. A first liquid guide hole, a second liquid guide hole, and a third liquid guide hole are opened on the outer side surface of the valve body. A first liquid guide oil passage for communicating the first liquid guide hole with the assembly chamber of the pressure-boosting valve core is opened inside the valve body. A second liquid guide oil passage for communicating the second liquid guide hole with the assembly chamber of the high-pressure cock is opened inside the valve body. Internal thread assembly blind holes are opened at the outer opening positions of the first liquid guide hole, the second liquid guide hole, and the third liquid guide hole. An external self-closing locking mechanism is threadedly assembled inside the internal thread assembly blind hole.

[0006] The external self-closing locking mechanism includes an external thread assembly sleeve threadedly sleeved inside the internal thread assembly blind hole, a first rectangular assembly groove and a second rectangular assembly groove opened at both ends of the outer arc surface of the external thread assembly sleeve, an external limit sleeve, an elastic locking mechanism elastically assembled inside the external limit sleeve, a first limit ring installed inside the external thread assembly sleeve, a second limit ring installed inside the external thread assembly sleeve, a sealing ball arranged between the first limit ring and the second limit ring, and a compression spring.

[0007] Strip-shaped flipping openings are opened inside the first rectangular assembly groove and the second rectangular assembly groove. Strip-shaped limit grooves matched with the strip-shaped flipping openings are opened at both the inner and outer ends of the inner side surface of the internal thread assembly blind hole.

[0008] The elastic locking mechanism includes an inner side assembly frame fixed on the inner side surface of the external limit sleeve, a flipping adjustment arm movably assembled inside the inner side assembly frame through an internal rotating shaft, a reset elastic piece installed on the side wall of the flipping adjustment arm, an arc-shaped extrusion seat fixed at one top end of one side of the flipping adjustment arm, and a lateral locking block fixed at one top end of the other side of the flipping adjustment arm.

[0009] The outer openings of the first limit ring and the second limit ring are of a rectangular structure.

[0010] The sealing ball is elastically assembled with the inner top end of the adjusting screw through the pressure-regulating spring. The adjusting screw is threadedly assembled with the locking nut on the outside. The adjusting spring, the pressure-boosting valve core, and the main valve core are axially connected. The high-pressure cock and the main valve seat are respectively inserted and fixed inside the openings on both sides of the valve body. The spring valve seat is inserted and fixed with the main valve seat. The high-temperature-resistant O-ring is installed at the assembly end of the spring valve seat and the main valve seat.

[0011] Arc-shaped guiding grooves are opened at both ends of the first limit ring and the second limit ring close to the sealing ball.

[0012] An annular sinking groove is provided on the outer side surface of the valve body around the openings of the first liquid guiding hole, the second liquid guiding hole and the third liquid guiding hole, and a flange connecting pipe for externally connecting an oil pipe is fixedly bolted inside the annular sinking groove.

[0013] A first assembly through hole communicating with the first liquid guiding oil passage and a second assembly through hole communicating with the second liquid guiding oil passage are provided on the left side wall of the valve body.

[0014] An internal filter element is inserted inside the first assembly through hole and the second assembly through hole, and an external sealing rod is axially installed at the outer end of the internal filter element.

[0015] The beneficial effects of the present invention are as follows:

[0016] (1) The setting of the pressure regulating spring of the parking brake interlock module of the present invention can adjust the working pressure according to different system pressure requirements, and has a wider range of use scenarios;

[0017] (2) The design that the sealing ball can be pressed into the valve seat makes the sealing safer and more reliable, and achieves the function of one-way liquid flow check. The design of the displacement spring makes the main spool and the booster spool operate more safely and reliably. The main spool and the booster spool return smoothly without jamming under no pressure;

[0018] (3) According to Pascal's principle, the design of the booster spool enables the pressure of the first liquid guiding hole to easily act on the main spool, and the booster spool can move easily inside. The second liquid guiding oil passage is blocked to ensure the quick cut-off of the first liquid guiding hole and the second liquid guiding hole;

[0019] (4) The design of the double A ports of the second liquid guiding hole and the third liquid guiding hole provides more connection options on site and prevents the inability to connect due to limited installation positions;

[0020] (5) The design of the high-temperature resistant O-ring ensures that the sealing is not affected even when the oil temperature is too high, making the performance safer and more reliable;

[0021] (6) Internal threaded assembly blind holes for installing an external self-closing locking mechanism are provided at the opening positions outside the first liquid guiding hole, the second liquid guiding hole and the third liquid guiding hole, which can achieve the self-closing effect during disassembly, thus facilitating later disassembly and maintenance and reducing the later maintenance and use costs. Description of the Drawings

[0022] The present invention will be further described below in conjunction with the drawings and embodiments.

[0023] Figure 1 is a schematic diagram of the internal structure of the present invention.

[0024] Figure 2 is a schematic diagram of the structure of the external self-closing locking mechanism of the present invention. Detailed implementation mode

[0025] The present invention will now be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Figure 1 and Figure 2 The shown parking brake interlock module includes a high-pressure cock 1, an adjusting spring 2, a pressure-boosting valve core 3, a main valve core 4, a sealing ball 5, a high-temperature-resistant O-ring 6, a pressure-regulating spring (7), an adjusting screw 8, a locknut 9, a spring valve seat 10, a main valve seat 11, and a valve body 12. A first liquid guide hole 13, a second liquid guide hole 14, and a third liquid guide hole 15 are opened on the outer side surface of the valve body 12. A first liquid guide oil passage P01 for communicating the first liquid guide hole 13 with the assembly chamber of the pressure-boosting valve core 3 is opened inside the valve body 12. A second liquid guide oil passage A01 for communicating the second liquid guide hole 14 with the assembly chamber of the high-pressure cock 1 is opened inside the valve body. External thread assembly blind holes 16 are opened at the outer opening positions of the first liquid guide hole 13, the second liquid guide hole 14, and the third liquid guide hole 15. An external self-closing locking mechanism is threadedly assembled inside the external thread assembly blind hole 16.

[0028] The external self-closing locking mechanism includes an external thread assembly sleeve 17 threadedly sleeved inside the internal thread assembly blind hole 16, a first rectangular assembly groove 18 and a second rectangular assembly groove 19 opened at both ends of the outer arc surface of the external thread assembly sleeve 17, an external limit sleeve 20, an elastic locking mechanism elastically assembled inside the external limit sleeve 20, a first limit ring 21 installed inside the external thread assembly sleeve 17, a second limit ring 22 installed inside the external thread assembly sleeve 17, a sealing ball 23 arranged between the first limit ring 21 and the second limit ring 22, and a compression spring 24.

[0029] Strip-shaped flipping openings 25 are opened inside the first rectangular assembly groove 18 and the second rectangular assembly groove 19. Strip-shaped limiting grooves 26 matching the strip-shaped flipping openings 25 are opened at both the inner and outer ends of the inner side surface of the internal thread assembly blind hole 16.

[0030] The elastic locking mechanism includes an inner assembly frame 27 fixed to the inner side surface of the outer limit sleeve 20, a flipping adjustment arm 28 movably assembled in the inner assembly frame 27 through an inner rotating shaft, a reset elastic sheet 29 installed on the side wall of the flipping adjustment arm 28, an arc-shaped extrusion seat 30 fixed to the top end of one side of the flipping adjustment arm 28, and a lateral locking block 31 fixed to the top end of the other side of the flipping adjustment arm 28.

[0031] The external self-closing locking mechanism is installed in both forward and reverse directions to deal with the oil inlet or the oil outlet. When people are assembling normally, they only need to insert a rectangular rod-shaped screwdriver into the first limit ring 21 and the second limit ring 22, and squeeze the elastic locking mechanism by squeezing the sealing ball 23, so that the elastic locking mechanism can be clamped with the external thread fitting sleeve 17, and the lateral locking block 31 is inserted into the inner limit card slot on the inner wall of the external thread fitting sleeve 17, so that the external thread fitting sleeve 17 and the outer limit sleeve 20 can be thread-fitted in the inner thread assembly blind hole 16. Then when it is assembled to the innermost side, release the tool squeezing the sealing ball 23. At this time, the elastic locking mechanism elastically resets with the strip-shaped limit slot 26 inside the inner thread assembly blind hole 16, thus completing the locking and preventing the external thread fitting sleeve 17 from rotating and loosening. Reverse operation can be used for disassembly.

[0032] The outer openings of the first limit ring 21 and the second limit ring are of rectangular structure.

[0033] The sealing ball 5 is elastically assembled with the inner top end of the adjusting screw 8 through a pressure regulating spring 7. The outer side of the adjusting screw 8 is thread-fitted with a clamping nut 9. The adjusting spring 2, the pressure increasing valve core 3 and the main valve core 4 are axially connected. The high-pressure plug 1 and the main valve seat 11 are respectively inserted and fixed in the openings on both sides of the valve body 12. The spring valve seat 10 is inserted and fixed with the main valve seat 11. The high-temperature O-ring 6 is installed at the assembly end of the spring valve seat 10 and the main valve seat 11.

[0034] Both the first limit ring 21 and the second limit ring 22 are provided with arc-shaped guiding grooves near the sealing ball end.

[0035] An annular sinking groove is formed on the outer side surface of the valve body 12 around the openings of the first liquid guide hole 13, the second liquid guide hole 14 and the third liquid guide hole 15. A flange connecting pipe 33 for externally connecting an oil pipe is bolt-fixed inside the annular sinking groove.

[0036] A first assembly through hole 34 communicating with the first liquid guide oil passage P01 and a second assembly through hole 35 communicating with the second liquid guide oil passage A01 are formed on the left side wall of the valve body 12.

[0037] An inner filter element 36 is inserted inside the first assembly through hole 34 and the second assembly through hole 35, and an outer sealing rod 37 is axially installed at the outer side end of the inner filter element 36.

[0038] The present invention is installed at the inlet of the hydraulic oil of the parking brake, that is, the second liquid guide hole 14 and the third liquid guide hole 15 are connected to the pressure oil inlet of the parking brake, and the first liquid guide hole 13 is connected to the control oil of the vehicle hydraulic system. One is installed for each parking brake.

[0039] When the parking brake is released, the pressure of the first liquid guide hole 13 increases. The pressure oil enters the parking brake through port A via the first liquid guide hole 13. At this time, the pressure of the first liquid guide hole 13 is higher than that of the second liquid guide hole 14 and the third liquid guide hole 15, so that the hydraulic oil in the parking brake cannot flow back to the first liquid guide hole 13 through the second liquid guide hole 14 and the third liquid guide hole 15, playing a role of pressure compensation, that is, the parking brake will not show the phenomenon that the friction layer contacts the brake disc due to pressure fluctuation.

[0040] When the parking brake is applied, the pressure of the first liquid guide hole 13 drops instantaneously. When the pressure of the first liquid guide hole 13 is lower than that of the second liquid guide hole 14 and the third liquid guide hole 15, the second liquid guide hole 14 and the third liquid guide hole 15 are connected to the first liquid guide hole 13. The hydraulic oil in the parking brake flows back to the first liquid guide hole 13 through the second liquid guide hole 14 and the third liquid guide hole 15 under the action of the disc spring in the parking brake, and then flows back to the vehicle hydraulic system pipeline.

[0041] The working principle of the "parking brake interlock module" of the present invention:

[0042] Zero-pressure normally open state: At the initial position, under the action of the pressure regulating spring 7 and the adjusting screw 8, the sealing ball 5 is pressed into the valve seat. The main valve core 4 pushes the pressure increasing valve core 3 in the oil passage to squeeze the position adjusting spring 2, so that the second liquid guide hole 14 and the first liquid guide hole 13 are connected by the second liquid guide oil passage A01. It realizes normally open at zero pressure, that is, the second liquid guide hole 14, the third liquid guide hole 15 and the first liquid guide hole 13 are connected.

[0043] Pressure compensation process: When the pressure of the first liquid guide hole 13 increases to the rated pressure, the pressure oil enters the pressure regulating spring cavity through the first liquid guide hole 13 and the first liquid guide oil passage P01, acting on the pressure increasing valve core 3. The area of the pressure increasing valve core 3 in the pressure regulating spring cavity is larger than the other end of the pressure increasing valve core 3. According to Pascal's principle (F = P·S), at this time, the thrust applied to the pressure increasing valve core 3 in the spring cavity increases, and the pressure increasing valve core 3 moves to the right in the oil passage, and the second liquid guide oil passage A01 is blocked, and the first liquid guide hole 13 is quickly cut off from the second liquid guide hole 14 and the third liquid guide hole 15. At this time, the pressure oil only enters the second liquid guide hole 14 and the third liquid guide hole 15 through the sealing ball 5 from the first liquid guide hole 13. Due to the action of the sealing ball 5, the oil liquid in the second liquid guide hole 14 and the third liquid guide hole 15 cannot flow back to the first liquid guide hole 13.

[0044] The setting of the pressure regulating spring 7 of the parking brake interlock module of the present invention can adjust the working pressure according to different system pressure requirements, and has a wider range of usage scenarios. The design of the sealing ball 5 that can be pressed into the valve seat makes the sealing safer and more reliable, and achieves the function of one-way liquid flow check. The design of the positioning spring 2 makes the operation of the main spool 4 and the booster spool 3 safer and more reliable. The main spool 4 and the booster spool 3 return smoothly without jamming under no pressure. According to Pascal's principle, the design of the booster spool 3 enables the pressure of the first liquid guide hole to easily act on the main spool 4, and the booster spool 3 can move easily inside. The second liquid guide oil passage is blocked to ensure the quick cut-off of the first and second liquid guide holes. The design of the double A ports of the second and third liquid guide holes provides more connection options on site and prevents connection failure due to limited installation positions. The design of the high-temperature resistant O-ring 6 ensures that the sealing is not affected even when the oil temperature is too high, making the performance safer and more reliable. Internal threaded assembly blind holes for installing external self-closing locking mechanisms are provided at the opening positions outside the first, second, and third liquid guide holes, which can achieve self-closing effects during disassembly, facilitating later disassembly and maintenance and reducing later maintenance and usage costs.

[0045] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can make various changes and modifications completely within the scope without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A parking brake interlock module, comprising a high-pressure cock (1), an adjusting spring (2), a supercharging valve core (3), a main valve core (4), a sealing ball (5), a high-temperature resistant O-ring (6), a pressure regulating spring (7), an adjusting screw (8), a locking nut (9), a spring valve seat (10), a main valve seat (11), and a valve body (12), characterized in that: On the outer side of the described valve body (12), a first liquid guide hole (13), a second liquid guide hole (14) and a third liquid guide hole (15) are provided. Inside the valve body (12), a first liquid guide oil passage (A01) for connecting the first liquid guide hole (13) with the assembly chamber of the pressure boosting valve core (3) is provided. Inside the valve body (12), a second liquid guide oil passage (P01) for connecting the second liquid guide hole (14) with the assembly chamber of the high-pressure plug (1) is provided. At the outer opening positions of the first liquid guide hole (13), the second liquid guide hole (14) and the third liquid guide hole (15), internal thread assembly blind holes (16) are provided, and an external self-closing locking mechanism is threadedly assembled inside the internal thread assembly blind holes (16). The described external self-closing locking mechanism includes an external thread assembly sleeve (17) threadedly sleeved inside the internal thread assembly blind hole (16), a first rectangular assembly groove (18) and a second rectangular assembly groove (19) provided at both ends of the outer arc surface of the external thread assembly sleeve (17), an external limit sleeve (20), an elastic locking mechanism elastically assembled inside the external limit sleeve (20), a first limit ring (21) installed inside the external thread assembly sleeve (17), a second limit ring (22) installed inside the external thread assembly sleeve (17), a sealing ball (23) and a compression spring (24) provided between the first limit ring (21) and the second limit ring (22). The elastic locking mechanism includes an inner side assembly frame (27) fixed on the inner side surface of the external limit sleeve (20), a flipping adjustment arm (28) movably assembled inside the inner side assembly frame (27) through an internal rotating shaft, a reset elastic piece (29) installed on the side wall of the flipping adjustment arm (28), an arc-shaped extrusion seat (30) fixed at one side top end of the flipping adjustment arm (28) and a lateral locking block (31) fixed at the other side top end of the flipping adjustment arm (28).

2. The parking brake interlock module according to claim 1, characterized in that: Bar-shaped flipping openings (25) are provided inside the first rectangular assembly groove (18) and the second rectangular assembly groove (19), and bar-shaped limit grooves (26) matching the bar-shaped flipping openings (25) are provided at both the inner and outer ends of the inner side surface of the internal thread assembly blind hole (16).

3. The parking brake interlock module according to claim 1, wherein: The outer openings of the first limit ring (21) and the second limit ring (22) are of a rectangular structure.

4. The parking brake interlock module according to claim 1, characterized in that: The sealing ball (5) is elastically assembled with the inner side top end of the adjusting screw (8) through a pressure regulating spring (7). An anti-loosening nut (9) is threadedly assembled on the outer side of the adjusting screw (8). The position adjusting spring (2), the pressure boosting valve core (3) and the main valve core (4) are axially connected. The high-pressure plug (1) and the main valve seat (11) are respectively inserted and fixed inside the openings at both sides of the valve body (12). The spring valve seat (10) is inserted and fixed with the main valve seat (11). The high-temperature O-ring (6) is installed at the assembly end of the spring valve seat (10) and the main valve seat (11).

5. The parking brake interlock module according to claim 1, characterized in that: Arc-shaped guiding grooves are provided at the ends of the first limit ring (21) and the second limit ring (22) close to the sealing ball.

6. The parking brake interlock module according to claim 1, characterized in that: An annular sinking groove is formed on the outer side surface of the valve body (12) around the openings of the first liquid guide hole (13), the second liquid guide hole (14) and the third liquid guide hole (15), and a flange connecting pipe (33) for externally connecting an oil pipe is fixedly bolted inside the annular sinking groove.

7. The parking brake interlock module according to claim 1, characterized in that: A first assembly through hole (35) communicating with the first liquid guide oil passage (A01) and a second assembly through hole (34) communicating with the second liquid guide oil passage (P01) are formed on the left side wall of the valve body (12).

8. The parking brake interlock module according to claim 7, characterized in that: An internal filter element (36) located inside and an external sealing rod (37) axially installed at the outer end of the internal filter element (36) are inserted into the first assembly through hole (35) and the second assembly through hole (34).

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