Electromagnetic air proportional valve for hydraulic retarder

Abstract

The utility model discloses an electromagnetic air proportional valve for a hydraulic retarder, which relates to the field of automobile accessories and comprises a valve body, a protective cover, a valve cover, a proportional electromagnet and a valve rod, the valve cover and the protective cover are respectively arranged at the front end and the rear end of the valve body, the proportional electromagnet is fixedly mounted in the valve body, and the moving front end of the proportional electromagnet is connected with one end of the valve rod. An adjusting wheel and a reset spring assembly are arranged between the moving rear end of the proportion electromagnet and the protective cover. A plastic pressing frame is arranged in the valve body, a synchronous spring assembly and a plastic sealing buckle are arranged in the plastic pressing frame in a clamped mode, the plastic sealing buckle extrudes the synchronous spring assembly, and the movable front end of the proportion electromagnet is fixedly connected with the plastic sealing buckle. The proportional valve is driven by electromagnetism to act, the proportional electromagnet is not prone to shaking, meanwhile, the line abrasion degree is small, and normal operation of the proportional valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of automobile accessories, in particular to an electromagnetic air proportional valve for a hydraulic retarder. Background Art

[0002] As an auxiliary braking device for rolling stock, hydraulic retarders are widely used in heavy vehicles such as urban buses, heavy trucks, military vehicles and large passenger buses. They can provide auxiliary braking torque for the vehicle when the vehicle is traveling at high speed or downhill, thereby reducing the number of times the brake pads are used, thereby greatly improving the overall safety of the vehicle.

[0003] The proportional valve is an important component of the hydraulic retarder. The existing proportional valve has no further protection at the air inlet, which may cause foreign matter to enter the proportional valve from the air inlet, causing the valve to get stuck and the hydraulic retarder to stop working, posing a safety hazard. In addition, the traditional proportional valve cannot respond to excessive pressure, resulting in excessive braking torque of the hydraulic retarder, which may cause the retarder drive gear to break or the working oil temperature to be too high. Furthermore, due to its structure, the traditional proportional valve has problems such as slow response time and insufficient service life. Utility Model Content

[0004] In view of the above-mentioned problems existing in the conventional hydraulic retarder proportional valve, the present utility model is proposed.

[0005] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] An electromagnetic air proportional valve for a hydraulic retarder comprises a valve body, a protective cover, a valve cover, a proportional electromagnet and a valve stem, wherein the valve cover and the protective cover are respectively arranged at the front and rear ends of the valve body, the proportional electromagnet is fixedly installed inside the valve body, the moving front end of the proportional electromagnet is connected to one end of the valve stem, and an adjusting wheel and a return spring assembly are arranged between the moving rear end of the proportional electromagnet and the protective cover; a plastic pressing frame is arranged inside the valve body, and a synchronous spring assembly and a plastic sealing buckle are clamped and arranged inside the plastic pressing frame, and the plastic sealing buckle squeezes the synchronous spring assembly and sets the proportional electromagnet. The moving front end of the magnet is fixedly connected to the plastic sealing buckle, and a rubber sealing bowl is provided between the valve body and the valve cover, and a pre-stressed spring assembly is provided on one side of the rubber sealing bowl. A metal sealing buckle is provided between the pre-stressed spring assembly and the internal clamping position of the valve body, and the rod wall of the valve stem passes through the interior of the synchronous spring assembly and the interior of the metal sealing buckle; the internal clamping connection of the valve cover is provided with a balancing spring assembly that is in extrusion contact with the rubber sealing bowl; a rubber sealing gasket is provided between the plastic pressure frame and the internal clamping position of the valve body, and the rubber sealing gasket squeezes and seals the plastic pressure frame and the clamping position of the valve body.

[0007] Preferably, an air inlet is provided at the top of the valve body, a filter is provided inside the air inlet, and an air outlet is provided at the top of the valve cover.

[0008] Preferably, a power interface is provided on the side wall of the valve body, and the power interface is electrically connected to the proportional solenoid.

[0009] Furthermore, a safety valve assembly is provided on the side wall of the valve cover.

[0010] Preferably, a wire protection sleeve is further provided in the power interface. In the above technical solution, the technical effects and advantages provided by the utility model are:

[0011] The utility model uses a proportional electromagnet and a valve stem. The proportional electromagnet generates electromagnetic thrust after power is turned on, so that the moving end of the proportional electromagnet pushes the valve stem, so that the valve stem pushes to overcome the complex synchronization spring assembly, the preload spring assembly and the balance spring assembly, so that the compressed air flows into the position of the rubber sealing bowl from the gap between the valve body and the metal sealing buckle, and then continues to flow into the interior of the valve cover and is discharged outward from the air outlet on the valve cover. When the power supply of the proportional electromagnet is disconnected, the valve stem is reset under the action of each spring assembly and the internal air flow gap of the valve body is sealed and blocked, so that the switching action of the proportional valve can be completed quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0013] Figure 1 This is an exploded view of the present invention from a first perspective;

[0014] Figure 2 This is an exploded view of the second perspective of the present invention;

[0015] Figure 3 for Figure 2 Schematic diagram of the structure of the middle valve cover, rubber sealing bowl, preload spring assembly, metal sealing buckle, balance spring assembly and safety valve assembly.

[0016] Description of reference numerals:

[0017] 1. Valve body; 2. Protective cover; 3. Valve cover; 4. Proportional solenoid; 5. Valve stem; 6. Adjusting wheel; 7. Return spring assembly; 8. Plastic pressure frame; 9. Synchronous spring assembly; 10. Plastic sealing buckle; 11. Rubber sealing bowl; 12. Pre-load spring assembly; 13. Metal sealing buckle; 14. Balance spring assembly; 15. Rubber sealing gasket; 16. Power interface; 17. Safety valve assembly; 18. Filter; 19. Wire grommet. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] The utility model provides Figure 1-3 The electromagnetic air proportional valve for a hydraulic retarder shown in the figure includes a valve body 1, a protective cover 2, a valve cover 3, a proportional electromagnet 4 and a valve stem 5. The valve cover 3 and the protective cover 2 are respectively arranged at the front and rear ends of the valve body 1, and the proportional electromagnet 4 is fixedly installed inside the valve body 1. The moving front end of the proportional electromagnet 4 is connected to one end of the valve stem 5, and an adjusting wheel 6 and a reset spring assembly 7 are arranged between the moving rear end of the proportional electromagnet 4 and the protective cover 2. The position of the output characteristic curve of the solenoid valve is adjusted by the adjusting wheel 6, and the reset spring assembly 7 and the adjusting wheel 6 cooperate to realize the characteristic curve adjustment function; a plastic pressure frame 8 is arranged inside the valve body 1, and a rubber sealing gasket 15 is arranged between the plastic pressure frame 8 and the internal clamping position of the valve body 1, and the rubber sealing gasket 15 squeezes and seals the plastic pressure frame 8 and the clamping position of the valve body 1, and the internal clamping connection of the plastic pressure frame 8 is provided with a synchronous spring assembly 9 and a plastic sealing buckle 10, and the plastic sealing buckle 10 synchronizes the synchronous spring assembly 9 Extrusion setting, the synchronous spring assembly 9 can push the plastic sealing port 10 to make it move synchronously with the valve stem 5, and the moving front end of the proportional electromagnet 4 is fixedly connected to the plastic sealing buckle 10. When working, the plastic sealing buckle 10 contacts the valve stem 5, thereby realizing the switching action; a rubber sealing bowl 11 is provided between the valve body 1 and the valve cover, and a preload spring assembly 12 is provided on one side of the rubber sealing bowl 11. A metal sealing buckle 13 is provided between the preload spring assembly 12 and the internal clamping position of the valve body 1, and the preload spring assembly 12 realizes the compression of the metal sealing buckle 13 under static conditions. The rod wall of the valve stem 5 passes through the interior of the synchronous spring assembly 9 and the interior of the metal sealing buckle 13. The metal sealing buckle 13 can not only play a sealing role, but also play a guiding role; the internal clamping connection of the valve cover 3 is provided with a balancing spring assembly 14 that is in extrusion contact with the rubber sealing bowl 11. The balancing spring assembly 14 can balance the force generated by the hardness of the sealing rubber bowl 11 itself.

[0020] like Figure 1-2As shown, an air inlet is provided at the top of the valve body 1, and a filter screen 18 is provided inside the air inlet to filter impurities in the air source to avoid valve sticking. An air outlet is provided at the top of the valve cover 3 to provide a function of guiding gas discharge.

[0021] like Figure 1-2 As shown, the side wall of the valve body 1 is provided with a power interface 16, and the power interface 16 is electrically connected to the proportional electromagnet 4. After the power plug is plugged into the power interface 16, the proportional electromagnet 4 can be powered on. A wire protection sleeve 19 is further provided in the power interface 16 to prevent the wires from being mechanically damaged and affected by the environment in the proportional valve.

[0022] like Figure 1-3 As shown, a safety valve assembly 17 is provided on the side wall of the valve cover 3, which can automatically release pressure when the interior of the valve cover 3 is over-pressurized, thereby preventing damage to components caused by overload of the retarder due to control program errors or valve jamming.

[0023] During use: When the proportional solenoid 4 is powered on, it will generate thrust under the drive of the current. This thrust is positively correlated with the current. Due to the joint action of the reset spring assembly 7, the synchronous spring assembly 9 and the preload spring assembly 12, when the current is small, the thrust is not enough to overcome the combined force generated by each spring, and the proportional valve is in a non-working state. When the current increases, the thrust generated by the proportional solenoid 4 increases accordingly. After overcoming the combined force of each spring, this thrust pushes the valve stem 4 and the metal sealing buckle 10 to the left, and the compressed air flows into the position of the rubber sealing bowl 11 through the gap between the valve body 1 and the metal sealing buckle 10. Since the rubber sealing bowl 11 is flexible, the pressure at the rubber sealing bowl 11 increases, causing the rubber sealing bowl 11 to deform, thereby continuing to flow into the interior of the valve cover 3 , the proportional valve enters the working state. When the pressure in the rubber sealing bowl 11 area increases to the point where the thrust generated by this pressure, the total force of the combined forces of the springs and the thrust generated by the proportional electromagnet 4 are equal, no more gas enters the rubber sealing bowl 11 area. As the pressure in the rubber sealing bowl 11 area and the pressure inside the valve cover 3 reach equilibrium, the proportional valve outputs a constant air pressure; when the current is removed, the thrust of the proportional electromagnet 4 disappears, and a pressure difference is generated between the inside of the valve body 1 and the inside of the valve cover 3. The pressure inside the valve cover 3 pushes the rubber sealing bowl 11 to deform it, connecting the air inlet and the air outlet to each other, and the gas in the working chamber is discharged from the air outlet. The proportional valve quickly exits the working state, thereby achieving the effect of fast response of the proportional valve. At the same time, such a structure can also extend the service life of the proportional valve.

[0024] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An electromagnetic air proportional valve for a hydraulic retarder, comprising a valve body (1), a protective cover (2), a valve cover (3), a proportional electromagnet (4) and a valve stem (5), characterized in that: The valve cover (3) and the protective cover (2) are respectively arranged at the front and rear ends of the valve body (1); the proportional electromagnet (4) is fixedly installed inside the valve body (1); the movable front end of the proportional electromagnet (4) is connected to one end of the valve stem (5); and an adjusting wheel (6) and a return spring assembly (7) are arranged between the movable rear end of the proportional electromagnet (4) and the protective cover (2); A plastic pressing frame (8) is provided inside the valve body (1), and a synchronous spring assembly (9) and a plastic sealing buckle (10) are provided inside the plastic pressing frame (8), and the plastic sealing buckle (10) squeezes the synchronous spring assembly (9), and the moving front end of the proportional electromagnet (4) is fixedly connected to the plastic sealing buckle (10), a rubber sealing bowl (11) is provided between the valve body (1) and the valve cover, and a pre-stressed spring assembly (12) is provided on one side of the rubber sealing bowl (11), and a metal sealing buckle (13) is provided between the pre-stressed spring assembly (12) and the internal clamping position of the valve body (1), and the rod wall of the valve stem (5) passes through the interior of the synchronous spring assembly (9) and the interior of the metal sealing buckle (13); The valve cover (3) is internally clamped with a balancing spring assembly (14) that is in press-contact with the rubber sealing bowl (11); A rubber sealing gasket (15) is provided between the plastic pressing frame (8) and the internal clamping position of the valve body (1), and the rubber sealing gasket (15) squeezes and seals the clamping position between the plastic pressing frame (8) and the valve body (1).

2. The electromagnetic air proportional valve for a hydraulic retarder according to claim 1, characterized in that: An air inlet is provided at the top of the valve body (1), and a filter screen (18) is provided inside the air inlet. An air outlet is provided at the top of the valve cover (3).

3. The electromagnetic air proportional valve for a hydraulic retarder according to claim 1, characterized in that: A power interface (16) is provided on the side wall of the valve body (1), and the power interface (16) is electrically connected to the proportional electromagnet (4).

4. The electromagnetic air proportional valve for a hydraulic retarder according to claim 1, characterized in that: A safety valve assembly (17) is provided on the side wall of the valve cover (3).

5. The electromagnetic air proportional valve for a hydraulic retarder according to claim 3, characterized in that: A wire protection sleeve (19) is further provided in the power interface (16).

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