Integral engine oil pressure relief device for diesel engine
By designing an integrated oil pressure relief device, the problems of complex assembly and high machining precision of the diesel engine's split pressure relief valve were solved, achieving simple assembly and rapid pressure relief, and improving the engine's assembly efficiency and the reliability of oil pressure relief.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNMING YUNNEI POWER
- Filing Date
- 2025-11-28
- Publication Date
- 2026-04-14
AI Technical Summary
The existing split-type pressure relief valve for diesel engines is complex to assemble, requires high precision machining of the engine body, and is prone to jamming, resulting in low engine oil pressure and significant after-sales service losses.
Design an integrated oil pressure relief device, including a valve body, valve core, pressure relief spring and spring seat. Through the installation gap of 0.5mm~1mm and the guide cavity structure, combined with the auxiliary oil drain groove, simple assembly and rapid pressure relief can be achieved.
It improves engine assembly efficiency, reduces engine block processing difficulty and cost, avoids jamming, and ensures the reliability and speed of oil pressure relief.
Smart Images
Figure CN121854635A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to diesel engine oil pressure relief, and more particularly to an integrated oil pressure relief device for diesel engines. Background Technology
[0002] The D20 diesel engine uses a split-type pressure relief valve. During production line assembly, the valve core, pressure relief spring, and spring seat need to be assembled onto the engine block separately. This process involves many parts and affects assembly efficiency. The valve core directly mates with the engine block bore, requiring high precision machining of the engine block valve core bore. To achieve faster oil drainage, an eccentric hole is also machined into the valve core bore, leading to significant tool wear and further impacting engine block machining efficiency. Furthermore, market feedback indicates that burrs on the engine block and impurities in the oil can cause the valve core to jam, resulting in low engine oil pressure or even cylinder scoring and engine failure, leading to substantial after-sales service losses. Based on these findings, the inventors, after extensive research, developed this integrated pressure relief device. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated oil pressure relief device for diesel engines.
[0004] The objective of this invention is achieved through the following technical solution: An integrated oil pressure relief device for a diesel engine, comprising a body, an oil pan installed at the bottom of the body, an installation hole on the body, and a pressure relief valve installed in the installation hole. The pressure relief valve includes a valve body, a valve core, a pressure relief spring, and a spring seat. There is an installation gap of 0.5mm to 1mm between the valve body and the installation hole. The valve body has a through hole, the middle of which is a guide cavity. A spring seat is detachably installed at the bottom of the through hole. The top of the through hole contracts to form an oil inlet, and a limiting step is formed between the oil inlet and the guide cavity. The valve core is internally slidably fitted, and a pressure relief spring is installed in the guide cavity. The bottom end of the pressure relief spring abuts against the spring seat, and the top end of the pressure relief spring abuts against the valve core. Under the action of the pressure relief spring, the valve core abuts against the limiting step. The valve body is also provided with multiple oil drain holes, which are connected to the guide cavity. One of the oil drain holes is directly opposite the low-pressure oil chamber on the machine body. When the valve core abuts against the limiting step, the valve core blocks the oil drain hole. An annular auxiliary oil drain groove is provided on the outer circumference of the valve core. When the oil drain hole is connected to the oil inlet hole, at least one auxiliary oil drain groove is located within the circumference enclosed by the multiple oil drain holes.
[0005] Optionally, the top of the valve body is a threaded connector with external threads, and the valve body and the machine body are detachably connected by threads.
[0006] Optionally, the valve body is also provided with an exhaust port, which is connected to the guide cavity and is located below the drain port.
[0007] Optionally, there are four drain holes, which are evenly distributed on the same circumference. There are two auxiliary drain grooves. When the drain holes are connected to the inlet holes, the auxiliary drain grooves at the top are located within the circumference formed by the multiple drain holes.
[0008] Optionally, the bottom of the through hole is a multi-step hole, the spring seat has a multi-step shaft, the largest end of the spring seat is threaded to the small hole of the multi-step hole, and the pressure relief spring is fitted on the smallest shaft of the spring seat.
[0009] Optionally, the bottom of the multi-stage stepped hole expands radially outward to form an annular limiting groove, and the corresponding stepped surface on the spring seat abuts against the top surface of the annular limiting groove.
[0010] Optionally, a blind hole is provided at the bottom of the valve core, and the top of the pressure relief spring abuts against the bottom of the blind hole.
[0011] Optionally, the bottom end of the through hole is provided with an internal hexagonal hole, and the bottom end of the spring seat is provided with an internal hexagonal hole.
[0012] Optionally, the valve body is a stepped column with a smaller top and a larger bottom. A combination washer is fitted on the small column of the valve body, and the mounting hole is a stepped hole. When the valve body is threadedly locked to the mounting hole, the combination washer is tightly attached to the stepped surface of the mounting hole.
[0013] The present invention has the following advantages: the integrated oil pressure relief device of the present invention has a simple pressure relief valve assembly, which improves the engine assembly efficiency; it has low requirements for the machining accuracy of the engine body, which reduces tool wear, machining costs and time; it is designed with two coaxial internal hexagons, and the pressure relief valve is completely embedded in the engine body to avoid interference with the oil pan, while also ensuring the assembly efficiency of the parts; at the same time, the valve core has an auxiliary oil drain groove, which speeds up the oil draining speed. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the pressure relief valve. Figure 3 This is a schematic diagram of the pressure relief valve. Figure 4 This is a schematic diagram of the valve body structure; Figure 5 This is a schematic diagram of the valve core structure; Figure 6 This is a schematic diagram of the spring seat structure; In the diagram, 1-valve body, 2-valve core, 3-pressure relief spring, 4-spring seat, 5-combination washer, 6-pressure relief valve, 7-oil pan, 8-machine body, 9-high pressure oil chamber, 10-low pressure oil chamber, 11-oil drain hole, 12-vent hole, 13-threaded connector, 14-oil inlet hole, 15-guide cavity, 16-internal thread, 17-annular limiting groove, 21-auxiliary oil drain groove, 22-blind hole. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0016] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.
[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0020] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0021] like Figure 1 As shown, an integrated oil pressure relief device for a diesel engine includes a body 8, an oil pan 7 mounted on the bottom of the body 8, and a mounting hole on the body 8 into which a pressure relief valve 6 is installed. In this embodiment, as shown... Figures 2-6 As shown, the pressure relief valve 6 includes a valve body 1, a valve core 2, a pressure relief spring 3, and a spring seat 4. The valve body 1 has a 0.5mm~1mm installation gap with the mounting hole. A through hole is provided on the valve body 1, with a guide cavity 15 in the middle. The spring seat 4 is detachably installed at the bottom of the through hole. In this embodiment, the bottom of the through hole is a multi-stage stepped hole, such as... Figure 6As shown, the spring seat 4 has a multi-stage stepped shaft. The largest end of the spring seat 4 is threadedly connected to the small hole of the multi-stage stepped hole. The pressure relief spring 3 is fitted onto the smallest shaft of the spring seat 4. Furthermore, the bottom of the multi-stage stepped hole expands radially outward to form an annular limiting groove 17. The corresponding stepped surface on the spring seat 4 abuts against the top surface of the annular limiting groove 17. During installation, when the corresponding stepped surface on the spring seat 4 abuts against the top surface of the annular limiting groove 17, it indicates that the spring seat 4 is installed in place. During installation, the annular limiting groove 17 can store a portion of the gas, thereby ensuring that the stepped surface of the spring seat 4 can completely fit against the top surface of the annular limiting groove 17. Moreover, during machining, the annular limiting groove 17 can also be used as a drain for machining the internal thread 16. In this embodiment, the top of the through hole contracts to form an oil inlet, and a limiting step is formed between the oil inlet and the guide cavity 15. A valve core 2 is slidably fitted inside the guide cavity 15, and a pressure relief spring 3 is also installed inside the guide cavity 15. The bottom end of the pressure relief spring 3 abuts against the spring seat 4, and the top end of the pressure relief spring 3 abuts against the valve core 2. Under the action of the pressure relief spring 3, the valve core 2 abuts against the limiting step. In this embodiment, a conical protrusion is provided at the top end of the valve core 2, and a conical surface matching the conical protrusion is provided at the junction of the oil inlet 14 and the guide hole. Under the action of the pressure relief spring 3, the conical protrusion of the valve core 2 abuts against the conical surface, thus blocking the oil inlet 14. Multiple oil drain holes 1 are also provided on the valve body 1. 1. The oil drain hole 11 is connected to the guide cavity 15. One of the oil drain holes 11 is directly opposite the low-pressure oil cavity 10 on the machine body 8. When the valve core 2 abuts against the limiting step, the valve core 2 blocks the oil drain hole 11. When the oil pressure in the high-pressure oil cavity 9 is higher than the set pressure, the oil pressure in the high-pressure oil cavity 9 will push the valve core 2 downward, and the pressure relief spring 3 will be compressed. When the high-pressure oil cavity 9, the oil inlet hole 14, the guide cavity 15, the pressure relief hole, and the low-pressure oil cavity 10 form a passage, the high-pressure oil will enter the low-pressure oil cavity 10, thus completing the oil drain. During the pressure relief process, although multiple oil drain holes 11 are provided, because the gap between the valve body 1 and the mounting hole is only 0.5mm~1mm, and because the oil is viscous, the others... The three drain holes 11 are not very effective at draining oil. Therefore, an annular auxiliary drain groove 21 is provided on the outer circumference of the valve core 2. Furthermore, the auxiliary drain groove 21 is a rectangular annular groove. When the drain hole 11 is connected to the inlet hole 14, at least one auxiliary drain groove 21 is located within the circumference formed by multiple drain holes 11. That is to say, multiple drain holes 11 can be connected through the auxiliary drain groove 21. Therefore, when the high-pressure oil enters the top of the guide cavity 15 through the inlet hole 14, the auxiliary drain groove 21 connects the drain holes 11. At this time, part of the high-pressure mechanism can enter the drain hole 11 facing the low-pressure oil cavity 10 through the auxiliary drain groove 21 and finally enter the low-pressure oil cavity 10, thereby accelerating the oil draining speed.
[0022] In this embodiment, as Figure 3 and Figure 4 As shown, the top of the valve body 1 is a threaded connector 13 with external threads. The valve body 1 and the machine body 8 are detachably connected by threads. After the valve body 1 and the machine body 8 are connected by threads, the threads will form several bends, thus providing a certain sealing effect. However, during long-term use, even if a small amount of oil leaks from this point, the leaked oil will flow onto the oil pan 7. Therefore, this pressure relief device does not need to consider the problem of oil leakage, thereby reducing costs.
[0023] In this embodiment, as Figure 4 As shown, the valve body 1 is also provided with an exhaust port 12, which is connected to the guide cavity 15 and is located below the oil drain port 11. When the valve core 2 moves downward, the gas in the guide cavity 15 can be quickly discharged into the gap between the valve body 1 and the machine body 8, avoiding resistance to the valve core 2, thereby ensuring the reliability of oil pressure relief.
[0024] In this embodiment, as Figure 4 As shown, there are four oil drain holes 11, and the four oil drain holes 11 are evenly distributed on the same circumference, as follows. Figure 5 As shown, there are two auxiliary oil drain grooves 21. When the oil drain hole 11 is connected to the oil inlet hole 14, the auxiliary oil drain groove 21 at the top is located within the circumference formed by the multiple oil drain holes 11. In this embodiment, when the valve core 2 blocks the oil inlet hole 14, the lower auxiliary oil drain groove 21 is located within the circumference formed by the multiple oil drain holes 11. At this time, the lower auxiliary oil drain groove 21 contains engine oil. During the downward movement of the valve core 2, the engine oil can play a lubricating role. Similarly, the engine oil in the auxiliary oil drain groove 21 has a lubricating effect on the movement of the valve core 2. Moreover, after opening the auxiliary oil drain groove 21, the contact area between the valve core 2 and the guide cavity 15 can be reduced, thereby facilitating the movement of the valve core 2 and ensuring the reliability of oil draining.
[0025] In this embodiment, as Figure 3 As shown, a blind hole 22 is provided at the bottom end of the valve core 2, and the top end of the pressure relief spring 3 abuts against the bottom of the blind hole 22, so that the elastic restoring force of the pressure relief spring 3 can be better applied to the valve core 2.
[0026] In this embodiment, as Figure 3 As shown, the bottom end of the through hole is provided with an internal hexagonal hole, and the bottom end of the spring seat 4 is provided with an internal hexagonal hole. The two internal hexagonal holes are coaxially arranged, which allows the entire pressure relief valve 6 to be embedded in the interior of the machine body 8, avoiding interference with the oil pan 7, and also ensuring the assemblability of the integral pressure relief valve 6.
[0027] In this embodiment, as Figure 2 and Figure 3As shown, the valve body 1 is a stepped column with a smaller top and a larger bottom. A combination washer 5 is fitted on the small column of the valve body 1. The mounting hole is a stepped hole. When the valve body 1 is threadedly locked to the mounting hole, the combination washer 5 is in close contact with the stepped surface of the mounting hole. When the pressure relief valve 6 is installed, a seal will be formed between the combination washer 5 and the mounting hole, thereby reducing the amount of oil leakage.
[0028] The working process of this invention is as follows: When the oil pressure in the high-pressure oil chamber 9 is greater than the set value, it will push the valve core 2 to move down. At this time, the pressure relief spring 3 is compressed. When the high-pressure oil chamber 9, the oil inlet 14, the guide cavity 15, the pressure relief hole and the low-pressure oil chamber 10 form a passage, the high-pressure oil will enter the low-pressure oil chamber 10, thereby completing the oil discharge. During the pressure relief process, some oil enters the low-pressure oil chamber 10 through the auxiliary oil discharge groove 21, thereby accelerating the oil discharge efficiency. After the oil discharge is completed, the valve core 2 moves upward under the action of the elastic restoring force of the pressure relief spring 3, thereby blocking the oil inlet 14, thereby blocking the oil passage between the high-pressure oil chamber 9 and the low-pressure oil chamber 10, and preventing the oil from the high-pressure oil cylinder from entering the low-pressure oil chamber 10.
[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. An integrated oil pressure relief device for a diesel engine, comprising a body, wherein an oil pan is installed at the bottom of the body, characterized in that: The machine body has a mounting hole, and a pressure relief valve is installed in the mounting hole. The pressure relief valve includes a valve body, a valve core, a pressure relief spring, and a spring seat. There is a 0.5mm~1mm installation gap between the valve body and the mounting hole. The valve body has a through hole, the middle of which is a guide cavity. A spring seat is detachably installed at the bottom of the through hole. The top of the through hole narrows to form an oil inlet, and a limiting step is formed between the oil inlet and the guide cavity. The valve core is slidably fitted in the guide cavity, and a pressure relief spring is also installed in the guide cavity. The bottom end of the pressure relief spring is connected to the spring seat. The spring seat abuts against the valve core, the top of the pressure relief spring abuts against the valve core, and the valve core abuts against the limiting step under the action of the pressure relief spring. The valve body is also provided with a plurality of oil drain holes, which are connected to the guide cavity. One of the oil drain holes is directly opposite the low-pressure oil cavity on the machine body. When the valve core abuts against the limiting step, the valve core blocks the oil drain hole. An annular auxiliary oil drain groove is provided on the outer circumference of the valve core. When the oil drain hole is connected to the oil inlet hole, at least one of the auxiliary oil drain grooves is located within the circumference enclosed by the plurality of oil drain holes.
2. The integrated oil pressure relief device for a diesel engine according to claim 1, characterized in that: The top of the valve body is a threaded connector with external threads, and the valve body and the machine body are detachably connected by threads.
3. The integrated oil pressure relief device for a diesel engine according to claim 2, characterized in that: The valve body is also provided with an exhaust port, which is connected to the guide cavity and is located below the oil drain hole.
4. The integrated oil pressure relief device for a diesel engine according to claim 3, characterized in that: There are four oil drain holes, and the four oil drain holes are evenly distributed on the same circumference. There are two auxiliary oil drain grooves. When the oil drain holes are connected to the oil inlet holes, the auxiliary oil drain grooves at the top are located within the circumference formed by the multiple oil drain holes.
5. A diesel engine integrated oil pressure relief device according to any one of claims 1 to 4, characterized in that: The bottom of the through hole is a multi-step hole, the spring seat has a multi-step shaft, the largest end of the spring seat is threadedly connected to the small hole of the multi-step hole, and the pressure relief spring is fitted on the smallest shaft of the spring seat.
6. The integrated oil pressure relief device for a diesel engine according to claim 5, characterized in that: The bottom of the multi-stage stepped hole expands radially outward to form an annular limiting groove, and the corresponding stepped surface on the spring seat abuts against the top surface of the annular limiting groove.
7. The integrated oil pressure relief device for a diesel engine according to claim 6, characterized in that: The bottom end of the valve core is provided with a blind hole, and the top end of the pressure relief spring abuts against the bottom of the blind hole.
8. The integrated oil pressure relief device for a diesel engine according to claim 7, characterized in that: The bottom end of the through hole is provided with an internal hexagonal hole, and the bottom end of the spring seat is provided with an internal hexagonal hole.
9. The integrated oil pressure relief device for a diesel engine according to claim 8, characterized in that: The valve body is a stepped column with a smaller top and a larger bottom. A combination washer is fitted on the small column of the valve body. The mounting hole is a stepped hole. When the valve body is threadedly locked to the mounting hole, the combination washer is in close contact with the stepped surface of the mounting hole.