Pressure relief structure of oil pump

Abstract

The invention discloses a pressure relief structure of an oil pump. The pressure relief structure comprises a valve body, a pressure relief cavity is formed in the valve body; an oil inlet hole is formed in one end of the pressure relief cavity, two oil drainage holes are formed in the side wall of the pressure relief cavity, and the two oil drainage holes are symmetrically distributed in the side wall of the pressure relief cavity; a movable adjusting component is arranged in the pressure relief cavity in the length direction of the pressure relief cavity. The adjusting component is used for automatically opening the oil inlet hole and the oil drainage hole during pressure relief and automatically closing the oil inlet hole and the oil drainage hole after pressure relief. According to the pressure relief structure of the oil pump, uniform left-right stress of the valve element during pressure relief is achieved, eccentric wear caused by one-way stress is avoided, the service life of the valve element is prolonged, and meanwhile the phenomenon of clamping stagnation of the valve element is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile oil pumps, and in particular relates to a pressure relief structure of an oil pump. Background Art

[0002] The engine oil pump's oil drain valve, a core device that ensures stable oil pump outlet pressure, plays an indispensable role in the proper operation of motorcycle engines. When a motorcycle experiences sudden acceleration or prolonged high-speed driving, the oil pressure within the oil pump rises dramatically. At this point, the timely activation and pressure relief of the drain valve is crucial. It automatically regulates the excessive oil pressure to a normal range, ensuring continuous and stable lubrication of all the engine's precision components and smooth engine operation. Throughout the drain valve's operation, the reciprocating motion of the valve core within the valve body is the core action that achieves its pressure relief function. The smoothness of the valve core's operation directly determines the reliability of the drain valve's performance. If the valve core becomes unstable, the drain valve's pressure relief effectiveness will be significantly reduced, affecting the overall performance of the engine. However, existing oil pump pressure-limiting valves have significant structural flaws. A commonly used design features a single drain port on only one side of the valve orifice. When the oil pressure exceeds the set value, the pressurized oil pushes the plunger to one side, opening the drain port and releasing the pressure. However, this single-port design has serious drawbacks. Because the pressure at the drain port is relatively low, while the pressure around the plunger is higher, this significant pressure differential inevitably forces the plunger toward the drain port. This extrusion has a number of undesirable consequences that cannot be ignored. First, the high-pressure oil creates intense friction between the plunger and the drain port. This friction increases significantly with age, ultimately leading to eccentric wear of the plunger. This eccentric wear not only reduces the pressure relief accuracy of the drain valve but also significantly shortens its service life. Second, under continued compression, the clearance around the plunger on the high-pressure side gradually increases. The increase in the gap allows larger impurities in the oil to easily enter the gap. The accumulation of these impurities significantly increases the risk of plunger sticking. Once the pressure-limiting valve becomes stuck or jammed, the oil pump flow rate will become abnormal, either too high or too low. Abnormal oil pump flow rate will directly lead to excessive or low oil pressure in the engine. Excessive oil pressure may damage the engine's seals, causing oil leaks; too low oil pressure cannot ensure effective lubrication of the engine components, resulting in increased component wear. Both of these situations will not only further reduce the service life of the valve core, but more seriously, may cause the serious consequence of engine failure and shutdown, greatly hindering the normal operation of the motorcycle and posing a serious threat to the user's personal safety. Therefore, to address the numerous issues with existing oil pump drain valves, the industry urgently needs to develop an oil pump pressure relief mechanism that can evenly distribute force on the valve core. This new mechanism aims to fundamentally address issues such as uneven valve core wear and sticking, while also improving the performance, reliability, and service life of the drain valve, thereby providing a solid foundation for stable engine operation. Summary of the Invention

[0003] The purpose of the present invention is to address the above-mentioned shortcomings and provide an oil pump pressure relief structure that ensures that the left and right forces on the valve core are evenly distributed during pressure relief, avoiding unilateral wear caused by unidirectional force, extending the service life of the valve core, and preventing the occurrence of valve core sticking. To achieve the above-mentioned objectives, the present invention provides the following technical solutions: An oil pump pressure relief structure includes a valve body; a pressure relief chamber is provided in the valve body; an oil inlet hole is provided at one end of the pressure relief chamber, and two oil drain holes are provided on the side wall, and the two oil drain holes are symmetrically distributed on the side wall of the pressure relief chamber; a movable adjustment component is provided in the pressure relief chamber along the length direction of the pressure relief chamber; the adjustment component is used to automatically open the oil inlet hole and the oil drain hole during pressure relief, and automatically close the oil inlet hole and the oil drain hole after pressure relief.

[0004] Furthermore, the regulating component includes a valve core and an elastic member; a valve core that can slide along the length direction of the pressure relief chamber is provided in the pressure relief chamber; the outer wall of the valve core is adapted to the inner wall of the pressure relief chamber, one end blocks the oil inlet hole, and the side wall blocks the oil drain hole; an elastic member is provided between the end of the valve core away from the oil inlet hole and the corresponding side wall of the pressure relief chamber.

[0005] Furthermore, an accommodating cavity is formed at one end of the valve core away from the oil inlet hole; one end of the elastic member extends into the accommodating cavity and is connected to the corresponding inner wall of the accommodating cavity.

[0006] Furthermore, a retaining ring is provided at one end of the pressure relief chamber relative to the oil inlet hole, and the other end of the elastic member is connected to the retaining ring.

[0007] Furthermore, the size of the oil inlet hole is smaller than the size of the cross section of the pressure relief chamber.

[0008] Furthermore, the side wall of the pressure relief chamber at the oil inlet hole is a symmetrical inclined surface; and the end of the valve core corresponding to the oil inlet hole is a conical surface that matches the inclined surface.

[0009] Furthermore, the pressure relief chamber is a cylindrical cavity; and the valve core is a cylindrical structure that matches the pressure relief chamber.

[0010] Furthermore, the retaining ring is an elastic retaining ring.

[0011] Furthermore, the elastic member is a spring.

[0012] The beneficial effects of the present invention are: The present invention discloses an oil pump pressure relief structure, comprising a valve body; a pressure relief chamber disposed within the valve body; an oil inlet hole disposed at one end of the pressure relief chamber, and two oil drain holes disposed on the sidewall thereof, the two oil drain holes being symmetrically distributed on the sidewall thereof; a movable regulating member disposed within the pressure relief chamber along its length; the regulating member being configured to automatically open the oil inlet hole and the oil drain hole during pressure relief, and automatically close the oil inlet hole and the oil drain hole after pressure relief. The oil pump pressure relief structure of the present invention ensures that the left and right forces on the valve core are evenly distributed during pressure relief, thereby avoiding eccentric wear caused by unidirectional force, prolonging the service life of the valve core, and preventing the valve core from becoming stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional structural diagram of the oil pump pressure relief structure of the present invention; Figure 2 A three-dimensional structural diagram of the oil pump pressure relief structure of the present invention from another perspective; Figure 3 for Figure 1 Cross-sectional view at AA in the middle; In the accompanying drawings: 1-valve body, 2-pressure relief chamber, 3-oil inlet hole, 4-oil drain hole, 5-valve core, 6-elastic part, 7-accommodating chamber, 8-retaining ring. DETAILED DESCRIPTION

[0014] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0015] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of the stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0016] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0017] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature would subsequently be oriented "above" or "above" the other element or feature. Thus, the example term "below" may encompass both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein should be interpreted accordingly.

[0018] Example 1 See attached Figures 1-3 An oil pump pressure relief structure includes a valve body 1, which is disposed at the oil outlet of the oil pump. A pressure relief chamber 2 is provided within the valve body 1, and an oil inlet 3 is provided at one end of the pressure relief chamber 2, which is connected to the oil outlet of the oil pump. Two oil drain holes 4 are formed on the side wall of the pressure relief chamber 2, and the two oil drain holes 4 are symmetrically distributed on the side wall of the pressure relief chamber 2. A movable adjusting component is provided in the pressure relief chamber 2. When pressure relief is not required, the adjusting component blocks the oil inlet hole 3 and the oil drain hole 4, and the oil in the oil pump cannot enter the pressure relief chamber 2. When pressure relief is required, the oil in the oil pump squeezes the adjusting component through the oil outlet, so that the adjusting component moves in the pressure relief chamber 2, and the oil inlet hole 3 and the oil drain hole 4 are opened. The oil enters the pressure relief chamber 2 from the oil outlet and is then discharged from the oil drain hole 4, thereby realizing pressure regulation of the oil pump. When the oil is discharged, the adjusting component automatically resets and blocks the oil inlet hole 3 and the oil drain hole 4 again.

[0019] Specifically, the regulating member includes a valve core 5 and an elastic member 6. The valve core 5 and the elastic member 6 are provided in the pressure relief chamber 2. The elastic member 6 is a spring. The pressure relief chamber 2 can be set as a cylindrical cavity. The valve core 5 is a cylindrical structure that matches the pressure relief chamber 2. The outer wall of the valve core 5 is adapted to the inner wall of the pressure relief chamber 2. The valve core 5 can slide in the pressure relief chamber 2 along the length direction of the pressure relief chamber 2. An accommodating chamber 7 is provided at the end of the valve core 5 away from the oil inlet hole 3. A spring is provided between the accommodating chamber 7 and the corresponding end of the pressure relief chamber 2. The spring is partially located in the accommodating chamber 7, with one end connected to the corresponding inner wall of the accommodating chamber 7. The other end of the spring is located in the pressure relief chamber 2, with the other end connected to the corresponding inner wall of the pressure relief chamber 2. By providing the accommodating chamber 7 on the valve core 5, the accommodating chamber 7 can constrain the axial movement of the spring, thereby preventing the spring from radially offsetting during compression or extension, and preventing the spring from interfering with other components. When the spring is under external force and pressure relief is not required, one end of the valve core 5 blocks the oil inlet hole 3, while the sidewall blocks the oil drain hole 4, preventing oil from the oil pump from entering the pressure relief chamber 2. When the oil pump needs to relieve pressure, oil passes through the oil inlet hole 3, pushing the valve core 5 to slide within the pressure relief chamber 2, causing the valve core 5 to move away from the oil inlet hole 3. The oil inlet hole 3 opens, allowing oil to enter the pressure relief chamber 2. At this time, the spring is continuously compressed, and the oil pushes the valve core 5 further and further away from the oil inlet hole 3 until the oil drain hole 4 opens. Oil is discharged from both oil drain holes 4 simultaneously, thus regulating the oil pump pressure. Because the two oil drain holes 4 are symmetrically arranged, the force on the valve core 5 is evenly distributed, and the valve core 5 always remains centered in the hole in the valve body 1. When the oil is discharged, the spring automatically resets in the absence of external force, pushing the valve core 5 back to block the oil drain hole 4 and the oil drain hole 4 again. The oil pump pressure relief structure of the present invention simultaneously relieves pressure through two symmetrically arranged oil relief holes 4, so that the valve core 5 is evenly stressed on the left and right sides and is always located in the center of the hole in the valve body 1, avoiding eccentric wear caused by unidirectional force, thereby increasing the service life of the valve core 5 and avoiding the phenomenon of the valve core 5 being stuck.

[0020] Specifically, a retaining ring 8 is provided at one end of the pressure relief chamber 2 opposite to the oil inlet hole 3. The retaining ring 8 is located between the inner wall of the pressure relief chamber 2 and the spring. The end of the spring away from the accommodating chamber 7 is connected to the retaining ring 8 to prevent the spring from falling off from the installation position during the compression process. The retaining ring 8 is an elastic retaining ring 8, which has low maintenance cost and strong compatibility.

[0021] Specifically, the oil inlet hole 3 at one end of the pressure relief chamber 2 is smaller than the cross-sectional size of the pressure relief chamber 2. When the sidewall of one end of the valve core 5 abuts the sidewall of the pressure relief chamber 2, the end face of the valve core 5 can completely abut the oil inlet hole 3, preventing pressurized oil from entering through the gap between the valve core 5 and the pressure relief chamber 2. Furthermore, the inner walls of the pressure relief chamber 2 on both sides of the oil inlet hole 3 are inclined surfaces, and the end face of the valve core 5 corresponding to the oil inlet hole 3 is a conical surface that matches the inclined surface. This ensures that when the engine oil enters the pressure relief chamber 2 from the oil inlet hole 3, the flow direction gradually transitions rather than changing at a right angle, reducing fluid separation and vortex generation, and preventing the entrapment of bubbles, thereby reducing the risk of cavitation.

[0022] All technical features in this embodiment can be freely combined according to actual needs. The above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

[0023] The above embodiments are preferred implementation schemes of the present invention. In addition, other implementation schemes are also included. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. An oil pump pressure relief structure, characterized by: The invention comprises a valve body (1); a pressure relief chamber (2) is provided in the valve body (1); an oil inlet hole (3) is provided at one end of the pressure relief chamber (2), and two oil leakage holes (4) are provided on the side wall, and the two oil leakage holes (4) are symmetrically distributed on the side wall of the pressure relief chamber (2); a movable regulating member is provided in the pressure relief chamber (2) along the length direction of the pressure relief chamber (2); the regulating member is used to automatically open the oil inlet hole (3) and the oil leakage hole (4) when pressure is released, and automatically close the oil inlet hole (3) and the oil leakage hole (4) after pressure is released.

2. The oil pump pressure relief structure according to claim 1, characterized in that: The regulating member comprises a valve core (5) and an elastic member (6); a valve core (5) is provided in the pressure relief chamber (2) and is slidable along the length direction of the pressure relief chamber (2); an outer wall of the valve core (5) is adapted to an inner wall of the pressure relief chamber (2), one end of the valve core blocks the oil inlet hole (3), and a side wall blocks the oil relief hole (4); an elastic member (6) is provided between an end of the valve core (5) away from the oil inlet hole (3) and a corresponding side wall of the pressure relief chamber (2).

3. The oil pump pressure relief structure according to claim 2, characterized in that: An accommodating cavity (7) is provided at one end of the valve core (5) away from the oil inlet hole (3); one end of the elastic member (6) extends into the accommodating cavity (7) and is connected to the corresponding inner wall of the accommodating cavity (7).

4. The oil pump pressure relief structure according to claim 3, characterized in that: A retaining ring (8) is provided at one end of the pressure relief chamber (2) opposite to the oil inlet hole (3); the other end of the elastic member (6) is connected to the retaining ring (8).

5. The oil pump pressure relief structure according to any one of claims 2 to 4, characterized in that: The elastic member (6) is a spring.

6. The oil pump pressure relief structure according to claim 4, characterized in that: The retaining ring (8) is an elastic retaining ring (8).

7. The oil pump pressure relief structure according to claim 2, characterized in that: The size of the oil inlet hole (3) is smaller than the size of the cross section of the pressure relief chamber (2).

8. The oil pump pressure relief structure according to claim 7, characterized in that: The side wall of the pressure relief chamber (2) at the position of the oil inlet hole (3) is a symmetrical inclined surface; and the end of the valve core (5) corresponding to the oil inlet hole (3) is a conical surface that matches the inclined surface.

9. The oil pump pressure relief structure according to claim 2, characterized in that: The pressure relief chamber (2) is a cylindrical cavity, and the valve core (5) is a cylindrical structure that matches the pressure relief chamber (2).

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