Bypass valve structure for pressure filtration of gearbox

Abstract

The bypass valve structure comprises a center pipe and a lower end cover, through openings for oil to pass through are distributed in the center pipe, a bypass opening is formed in the middle of the lower end cover, a liquid inlet mouthpiece is integrally arranged at the position, located at the bypass opening, of the upper end face of the lower end cover, and a valve element and a return spring are arranged in the liquid inlet mouthpiece. The lower end of the return spring abuts against the valve element, the upper end of the return spring abuts against a check block fixedly arranged in the middle of the center pipe, the check block, the lower end cover, the return spring, the valve element and the liquid inlet connecting nozzle form a bypass valve, and the upper end and the lower end of the liquid inlet connecting nozzle are connected with the inner wall of the center pipe in a sleeved mode and attached to the inner wall of the center pipe. The central pipe is clamped in an annular sinking groove in the middle of the outer wall of the liquid inlet mouthpiece through a strip-shaped clamping block, so that a stable and firm assembly relation is formed between the central pipe and the liquid inlet mouthpiece, and the stability of the bypass valve structure is improved; the utility model has the advantages of simple structure, convenient assembly and stable function.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure resistance and earthquake resistance of filter elements, and particularly relates to a bypass valve structure for a gearbox pressure filter. Background Art

[0002] Filter elements are commonly used to filter impurities in the automotive oil system to protect the engine or transmission. The bypass valve is a key component of the oil filter element. As the use time of the filter element increases, it will cause the filter element to become blocked and the oil inlet volume to be insufficient. When the impurities captured by the filter element in the system increase to a certain extent, the oil pressure opens the bypass valve (the bypass valve opens under a specific pressure), and the oil fluid enters the system from the bypass valve of the filter element to avoid greater damage to the system caused by dry grinding (oil fluid interruption or insufficient oil supply).

[0003] The publication number CN221322504U discloses a new type of small-diameter filter element with a bypass valve. Among them, the central tube is clamped with the through groove on the liquid inlet nozzle through the strip-shaped clamping block at its lower end, and the lower end face of the central tube is close to or abuts against the upper end face of the liquid inlet nozzle, so as to prevent the central tube from shaking on the liquid outlet nozzle. In addition, after the guide rod is connected with the valve core, the stable movement of the valve core is realized by cooperating with the guide groove on the central tube. At present, on this basis, it is necessary to improve the structural strength at the bypass valve so that the filter element can withstand greater hydraulic pressure and have higher earthquake resistance, so as to adapt to the use scenario of the gearbox. Content of the Utility Model

[0004] In view of the requirements in the prior art, the utility model provides a bypass valve structure for a gearbox pressure filter, aiming to improve the stability of the bypass valve function.

[0005] A bypass valve structure for a gearbox pressure filter includes a central tube and a lower end cover. The central tube is distributed with through holes for the oil fluid to pass through. A bypass port is arranged in the middle of the lower end cover. An inlet nozzle is integrally arranged at the position of the bypass port on the upper end face of the lower end cover. A valve core and a return spring are arranged in the inlet nozzle. The valve core blocks the bypass port. The lower end of the return spring abuts against the valve core, and the upper end of the return spring abuts against a stop block fixedly arranged in the middle of the central tube. The stop block, the lower end cover, the return spring, the valve core and the inlet nozzle form a bypass valve. The lower end end of the central tube is a first annular structure and is sleeved on the root of the inlet nozzle. The inner ring of the first annular structure fits with the outer wall of the inlet nozzle. The upper end end of the inlet nozzle is a second annular structure and fits with the inner wall of the central tube. An annular sink is arranged in the middle of the outer wall of the inlet nozzle. A strip-shaped clamping block is arranged in the through hole corresponding to the upper side wall of the annular sink. The strip-shaped clamping block is arranged vertically. The clamping end of the strip-shaped clamping block blocks the upper side wall of the annular sink. The fixed end of the strip-shaped clamping block is integrally connected with the side wall of the central tube. The outer circumference of the valve core slides up and down in cooperation with the inner wall of the inlet nozzle. A notch for the oil fluid to pass through is arranged at the outer edge of the valve core.

[0006] Further, the central tube is of a frame structure.

[0007] Further, the stopper is an annular body, and the outer ring of the annular body and the inner wall of the central tube are integrally connected through a connecting block.

[0008] Further, through grooves for supplying liquid are distributed on the bottom wall of the annular sinking groove.

[0009] Further, reinforcing ribs are integrally arranged at positions between adjacent through grooves on the bottom wall of the annular sinking groove, and the reinforcing ribs are also integrally connected to the lower side wall surface of the annular sinking groove.

[0010] Further, the valve core is disc-shaped, and the bottom surface of the valve core is an outer arc surface and is used to block the bypass port.

[0011] Further, a cylindrical platform is integrally arranged in the middle of the top surface of the valve core, the lower end of the return spring is sleeved on the cylindrical platform, and the inner ring of the return spring is close to the outer ring of the cylindrical platform.

[0012] Further, the valve core is made of rubber material.

[0013] Further, the central tube and the end cover are made of the same material and are both made of plastic material.

[0014] The beneficial effects of the present utility model are as follows: The upper end and the lower end of the liquid inlet nozzle are both sleeved and fitted with the inner wall of the central tube, and the central tube is clamped in the annular sinking groove in the middle of the outer wall of the liquid inlet nozzle through the strip-shaped clamping blocks, so as to form a stable and firm assembly relationship between the central tube and the liquid inlet nozzle, thereby improving the stability of the bypass valve structure; the structure of the present utility model is simple, convenient for assembly, and has stable functions. Description of the Drawings

[0015] Figure 1 is a schematic cross-sectional structure diagram of the present utility model;

[0016] Figure 2 is a schematic cross-sectional structure diagram of the cooperation relationship between the liquid inlet nozzle and the valve;

[0017] Figure 3 is a schematic structure diagram of the central tube;

[0018] Figure 4 is a schematic structure diagram of the liquid inlet nozzle and the lower end cover. Detailed Embodiments

[0019] The following will make a detailed description of the present utility model in conjunction with the accompanying drawings. The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described by referring to the accompanying drawings are exemplary and are only used to explain the present utility model, rather than being construed as a limitation to the present utility model. The orientation terms such as left, middle, right, upper, and lower in the embodiments of the present utility model are only relative concepts to each other or are referenced based on the normal use state of the product, and should not be considered as restrictive.

[0020] A bypass valve structure for a gearbox pressure filter, as Figure 1 shown, includes a central tube 1 and a lower end cover 5, both of which are made of plastic. The central tube 1 is preferably a frame structure, which can form a through port 15 for the oil liquid to pass through on the central tube 1. A bypass port 51 is provided in the middle of the lower end cover 5. An inlet liquid nozzle 6 is integrally provided at the position of the bypass port 51 on the upper end face of the lower end cover 5. A valve core 4 and a return spring 2 are provided in the inlet liquid nozzle 6. The valve core 4 blocks the bypass port 51. To improve the sealing performance of the valve core 4 to the bypass port 51, in combination with Figure 2 shown, the valve core 4 is a disc-shaped made of rubber. The bottom surface of the valve core 4 is an outer arc surface and is used to block the bypass port 51. A cylindrical platform 3 is integrally provided in the middle of the top surface of the valve core 4. The lower end of the return spring 2 abuts against the valve core 4 and is sleeved on the cylindrical platform 3. The inner circle of the return spring 2 is close to the outer circle of the cylindrical platform 3, thereby restricting the radial position of the return spring 2 in the central tube 1 and ensuring the normal expansion and contraction of the return spring 2. The upper end of the return spring 2 abuts against a stop block 11 fixedly provided in the middle of the central tube 1. To improve the structural strength of the stop block 11 and avoid the stop block 11 separating the central hole of the central tube 1, the stop block 11 is an annular body. The outer circle of the annular body and the inner wall of the central tube 1 are integrally connected through a connecting block 12. The oil liquid can flow to the upper part of the central tube 1 through the central hole of the annular body and the gap between the annular body and the central tube 1. The stop block 11, the lower end cover 5, the return spring 2, the valve core 4 and the inlet liquid nozzle 6 form a bypass valve. In combination with Figure 3 and Figure 4As shown, the lower end of the central tube 1 is a first annular structure 14 and is sleeved on the root of the liquid inlet nozzle 6. The inner circle of the first annular structure 14 is in contact with the outer wall of the liquid inlet nozzle 6. The upper end of the liquid inlet nozzle 6 is a second annular structure 61 and is in contact with the inner wall of the central tube 1. The inner diameter of the inner circle of the first annular structure 14 is greater than or equal to the outer diameter of the second annular structure 61. An annular groove 62 is provided in the middle of the outer wall of the liquid inlet nozzle 6. A strip-shaped clamping block 13 is provided in the through port 15 corresponding to the upper side wall of the annular groove 62. The strip-shaped clamping block 13 is vertically arranged. The clamping end of the strip-shaped clamping block 13 abuts against the upper side wall of the annular groove 62. The fixed end of the strip-shaped clamping block 13 is integrally connected to the side wall of the central tube 1. The inner side surface and the outer side surface of the strip-shaped clamping block 13 respectively coincide with the inner wall surface and the outer wall surface of the central tube 1. A clamping platform is integrally provided at the position on the inner side surface of the strip-shaped clamping block 13 corresponding to the upper side wall of the annular groove 62. The clamping platform is clamped on the upper side wall of the annular groove 62. The outer circumference of the valve core 4 is in sliding fit with the inner wall of the liquid inlet nozzle 6 up and down. A notch 41 for the oil liquid to pass through is provided at the outer edge of the valve core 4.

[0021] Among them, in order to reduce the shielding of the filter medium by the liquid inlet nozzle 6 and improve the use area of the filter medium, through grooves 63 for the oil liquid to pass through are distributed on the bottom wall of the annular groove 62. When the bottom wall between adjacent through grooves 63 is narrow, in order to improve the overall structural strength of the liquid inlet nozzle 6, reinforcing ribs 64 are integrally provided at the positions between adjacent through grooves on the bottom wall of the annular groove 62. The reinforcing ribs 64 are also integrally connected to the lower side wall surface of the annular groove 62.

[0022] During assembly, the valve core 4 and the return spring 2 are sequentially placed into the liquid inlet nozzle 6. At the same time, the lower end of the return spring 2 is sleeved on the cylindrical platform 3 of the valve core 4. Then the central tube 1 is sleeved downward on the liquid inlet nozzle 6. The strip-shaped clamping block 13 is clamped on the upper side wall of the annular groove 62 to complete the assembly. When the internal and external pressure difference of the pressure filter is greater than the bypass valve opening pressure and the valve core 4 compresses the return spring 2 under the action of the oil pressure, the bypass valve opens.

[0023] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A bypass valve structure for a gearbox pressure filter, comprising a central tube and a lower end cover. The central tube is distributed with ports for the oil liquid to pass through. A bypass port is provided in the middle of the lower end cover. An inlet liquid nozzle is integrally provided at the position of the bypass port on the upper end surface of the lower end cover. A valve core and a return spring are arranged in the inlet liquid nozzle. The valve core seals the bypass port. The lower end of the return spring abuts against the valve core, and the upper end of the return spring abuts against a stop block fixedly arranged in the middle of the central tube. The stop block, the lower end cover, the return spring, the valve core and the inlet liquid nozzle form a bypass valve, characterized in that: The lower end of the central tube is a first annular structure and is sleeved on the root of the liquid inlet nozzle. The inner circle of the first annular structure is in contact with the outer wall of the liquid inlet nozzle, and the upper end of the liquid inlet nozzle is a second annular structure and is in contact with the inner wall of the central tube; an annular groove is provided in the middle of the outer wall of the liquid inlet nozzle, and a strip-shaped clamping block is arranged in the through port corresponding to the upper side wall of the annular groove. The strip-shaped clamping block is arranged vertically, and the clamping end of the strip-shaped clamping block abuts against the upper side wall of the annular groove. The fixed end of the strip-shaped clamping block is integrally connected to the side wall of the central tube; the outer circumference of the valve core slides up and down in cooperation with the inner wall of the liquid inlet nozzle, and a notch for allowing the oil liquid to pass through is provided at the outer edge of the valve core.

2. The bypass valve structure for a gearbox filter press according to claim 1, characterized in that: The central tube is a frame structure.

3. The bypass valve structure for a gearbox filter press according to claim 1, characterized in that: The stopper is an annular body, and the outer circle of the annular body is integrally connected to the inner wall of the central tube through a connecting block.

4. The bypass valve structure for gearbox pressure filtration according to claim 1, wherein: Through grooves for allowing the oil liquid to pass through are distributed on the bottom wall of the annular groove.

5. The bypass valve structure for a gearbox filter press according to claim 4, characterized in that: Reinforcing ribs are integrally arranged at positions between adjacent through grooves on the bottom wall of the annular groove, and the reinforcing ribs are also integrally connected to the lower side wall surface of the annular groove.

6. The bypass valve structure for a gearbox pressure filter according to claim 1, characterized in that: The valve core is disc-shaped, and the bottom surface of the valve core is an outer arc surface and is used to block the bypass port.

7. The bypass valve structure for a gearbox filter press according to claim 6, characterized in that: A cylindrical platform is integrally arranged in the middle of the top surface of the valve core. The lower end of the return spring is sleeved on the cylindrical platform, and the inner circle of the return spring is close to the outer circle of the cylindrical platform.

8. The bypass valve structure for the valve pressing of the gearbox according to claim 6, wherein: The valve core is made of rubber.

9. The bypass valve structure for a gearbox filter press according to claim 1, characterized in that: The central tube and the end cover are made of the same material, which is plastic.

Images