Engine oil pump pressure relief valve structure

Abstract

This utility model relates to a pressure relief valve structure for an engine oil pump, including an oil pump housing and a pressure relief valve assembly. The connection between the oil pump housing and the pressure relief valve assembly is provided with an internal thread. The oil pump housing is threadedly connected to the external thread of the valve stem on the pressure relief valve assembly via the internal thread. The oil pump housing and the pressure relief valve assembly are sealed by a top sealing ring and a bottom sealing ring fitted on the pressure relief valve assembly. This utility model solves the problem of oil pump pressure relief valve jamming; avoids risks such as lubrication system seal leakage and engine cylinder scoring; and saves oil pump development time and costs.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and specifically to the structure of an engine oil pump pressure relief valve. Background Technology

[0002] The platform engine frequently experienced issues with excessively high or low oil pressure during operation. Disassembly of the oil pump relief valve revealed severe wear on one side of the plunger, indicating that plunger jamming was causing abnormal oil pump drainage. Analysis of the current oil pump relief valve structure revealed that it only allows oil to drain through one side of the housing, resulting in uneven force on the plunger and severe wear on one side. This allowed impurities in the oil to easily enter the gap between the plunger and the housing cavity, causing plunger jamming.

[0003] The existing technical shortcomings are: The oil pump pressure relief valve structure only allows oil to drain through the drain port on one side of the housing. The plunger is subjected to uneven force, and one side wears severely. Impurities in the oil can easily enter the gap between the plunger and the inner cavity of the housing, causing the plunger to get stuck. This leads to the pressure relief valve being unable to drain oil normally. In the engine, this manifests as oil pressure that is too high or too low. Too high oil pressure can easily cause leaks in the lubrication system seals, while too low oil pressure can easily cause engine cylinder scoring. Summary of the Invention

[0004] This utility model addresses the above-mentioned problems by providing an engine oil pump pressure relief valve structure, which aims to solve the problem of oil pump pressure relief valve sticking; avoid risks such as lubrication system seal leakage and engine cylinder scoring; and save oil pump development time and costs.

[0005] To solve the above problems, the technical solution provided by this utility model is as follows: An engine oil pump pressure relief valve structure includes an oil pump housing and a pressure relief valve assembly. The connection between the oil pump housing and the pressure relief valve assembly is provided with an internal thread. The oil pump housing is threadedly connected to the valve stem of the pressure relief valve assembly via the internal thread. The oil pump housing and the pressure relief valve assembly are sealed by a top sealing ring and a bottom sealing ring fitted on the pressure relief valve assembly.

[0006] Preferably, the connection between the oil pump housing and the pressure relief valve assembly is provided with, from the outside to the inside, a housing end face, a housing internal thread, a housing inner cavity, a housing oil drain port, a housing oil drain groove, a bottom end face of the housing inner cavity, and a housing oil inlet; the inner diameter of the housing oil drain groove is larger than the inner diameter of the housing inner cavity.

[0007] Preferably, the pressure relief valve assembly includes a valve body, a top sealing ring, a bottom sealing ring, a spring, and a plunger; the top sealing ring, the bottom sealing ring, the spring, and the plunger are sequentially mounted on the valve body.

[0008] Preferably, the valve body includes a valve body head recess, a valve body bottom recess, an external thread on the valve body stem, multiple valve body oblong holes, a valve body circular hole, a valve body bottom end face, a valve body large inner cavity, a valve body stem, a valve body guide post, a valve body large inner cavity bottom end face, a valve body small inner cavity bottom end face, a valve body small inner cavity, and a valve body head lower end face; the valve body oblong holes are evenly distributed around the circumference of the valve body stem near the valve body bottom end face; the valve body oblong holes are connected to the housing oil drain port and the housing oil drain groove. The spatial positions correspond to each other; the valve body circular hole is located at one end of the valve body rod near the external thread of the valve body rod; the outer diameter of the valve body rod is smaller than the outer diameter of the valve body guide post and the major diameter of the external thread of the valve body rod; the outer diameter of the valve body guide post is smaller than the inner diameter of the inner cavity of the housing; the distance from the lower end face of the valve body head to the bottom end face of the valve body is smaller than the distance from the bottom end face of the inner cavity of the housing to the end face of the housing; the external thread of the valve body rod is matched and engaged with the internal thread of the housing.

[0009] Preferably, the valve body has four waist-shaped holes.

[0010] Preferably, the top sealing ring is installed in the groove of the valve body head; the inner diameter of the top sealing ring is smaller than the outer diameter of the groove of the valve body head; the outer diameter of the top sealing ring is larger than the major diameter of the external thread of the valve body stem.

[0011] Preferably, the bottom sealing ring is installed in the bottom groove of the valve body; the inner diameter of the bottom sealing ring is smaller than the outer diameter of the bottom groove of the valve body; the outer diameter of the bottom sealing ring is larger than the outer diameter of the valve body guide post; and the outer diameter of the bottom sealing ring is larger than the inner diameter of the inner cavity of the housing.

[0012] Preferably, the plunger includes a plunger head end face, a plunger bottom end face, a plunger inner cavity bottom end face, a plunger inner cavity, and a plunger rod portion; the outer diameter of the plunger rod portion is smaller than the inner diameter of the large inner cavity of the valve body; the length of the plunger rod portion is smaller than the length of the large inner cavity of the valve body; the diameter of the plunger head end face is larger than the inner diameter of the oil inlet of the housing; the plunger is limited in movement by the bottom end face of the inner cavity of the housing and the bottom end face of the large inner cavity of the valve body.

[0013] Preferably, one end of the spring is installed in the small inner cavity of the valve body, and the other end is installed in the inner cavity of the plunger; the outer diameter of the spring is smaller than the inner diameter of the small inner cavity of the valve body and the inner diameter of the inner cavity of the plunger; the spring should be in a compressed state after installation, and the coil should not be squeezed when the spring is in the extreme compression state.

[0014] Compared with the prior art, this utility model has the following advantages: 1. This utility model improves the oil pump's resistance to dirty oil, solves the problem of oil pump pressure relief valve sticking, and avoids risks such as lubrication system seal leakage and engine cylinder scoring.

[0015] 2. Since this utility model only changes the pressure relief valve assembly and does not change the oil pump housing, it greatly saves the development time and development cost of the oil pump.

[0016] 3. This utility model, through the limiting structure of the valve body, avoids coil squeezing due to excessive compression of the spring, thus ensuring the service life of the spring. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the combined structure of the oil pump housing and pressure relief valve assembly according to a specific embodiment of the present invention; Figure 2a This is a side view schematic diagram of the combined structure of the oil pump housing and pressure relief valve assembly according to a specific embodiment of this utility model; Figure 2b for Figure 2a A schematic diagram of the cross-sectional structure along the AA direction; Figure 3 This is a schematic diagram of the oil pump housing structure according to a specific embodiment of the present invention; Figure 4a This is a side view schematic diagram of the oil pump housing according to a specific embodiment of the present utility model; Figure 4b for Figure 4a A schematic diagram of the cross-sectional structure along the BB direction; Figure 5 This is an exploded view of the pressure relief valve assembly structure according to a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the valve body structure of a specific embodiment of the present utility model; Figure 7a This is a schematic diagram of the valve body front view of a specific embodiment of this utility model; Figure 7b for Figure 7a A schematic diagram of the cross-sectional structure in the CC direction; Figure 8 This is a schematic diagram of the plunger structure of a specific embodiment of the present invention.

[0018] The components include: 1. Oil pump housing; 11. Housing internal thread; 12. Housing drain port; 13. Housing drain groove; 14. Bottom end face of housing inner cavity; 15. Housing inner cavity; 16. Housing inlet; 17. Housing end face; 2. Pressure relief valve assembly; 21. Valve body; 211. Valve body head groove; 212. Valve body bottom groove; 213. Valve body stem external thread; 214. Valve body oblong hole; 215. Valve body round hole; 216. Valve body bottom end face; 217. Valve... 218 Valve body stem, 219 Valve body guide post, 21a Bottom end face of the large inner cavity of the valve body, 21b Bottom end face of the small inner cavity of the valve body, 21c Small inner cavity of the valve body, 21d Lower end face of the valve body head, 22 Top sealing ring, 23 Bottom sealing ring, 24 Spring, 25 Piston, 251 Piston head end face, 252 Piston bottom end face, 253 Bottom end face of the inner cavity of the piston, 254 Piston inner cavity, 255 Piston stem. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0020] This utility model application claims protection for an engine oil pump pressure relief valve structure, such as Figures 1-8 As shown, the assembly includes an oil pump housing 1 and a pressure relief valve assembly 2. The connection between the oil pump housing 1 and the pressure relief valve assembly 2 is provided with an internal thread 11. The oil pump housing 1 is threadedly connected to the external thread 213 of the valve stem on the pressure relief valve assembly 2 through the internal thread 11. The oil pump housing 1 and the pressure relief valve assembly 2 are sealed by a top sealing ring 22 and a bottom sealing ring 23 fitted on the pressure relief valve assembly 2.

[0021] It should be noted that the connection between the oil pump housing 1 and the pressure relief valve assembly 2 is provided with the following components in sequence from the outside to the inside: housing end face 17, housing internal thread 11, housing inner cavity 15, housing oil drain port 12, housing oil drain groove 13, housing inner cavity bottom end face 14, and housing oil inlet 16; the inner diameter of the housing oil drain groove 13 is larger than the inner diameter of the housing inner cavity 15.

[0022] It should be noted that the pressure relief valve assembly 2 includes a valve body 21, a top sealing ring 22, a bottom sealing ring 23, a spring 24, and a plunger 25; the top sealing ring 22, the bottom sealing ring 23, the spring 24, and the plunger 25 are sequentially installed on the valve body 21.

[0023] It should be noted that the valve body 21 includes a valve body head recess 211, a valve body bottom recess 212, a valve body stem external thread 213, multiple valve body waist-shaped holes 214, a valve body round hole 215, a valve body bottom end face 216, a valve body large inner cavity 217, a valve body stem 218, a valve body guide post 219, a valve body large inner cavity bottom end face 21a, a valve body small inner cavity bottom end face 21b, a valve body small inner cavity 21c, and a valve body head lower end face 21d; the valve body waist-shaped holes 214 are evenly distributed around the circumference of the valve body stem 218 near the valve body bottom end face 216; the valve body waist-shaped holes 214... 14 corresponds to the spatial position of the oil drain port 12 and the oil drain groove 13 of the housing; the valve body circular hole 215 is set at the end of the valve body rod 218 near the external thread 213 of the valve body rod; the outer diameter of the valve body rod 218 is smaller than the outer diameter of the valve body guide post 219 and the major diameter of the external thread 213 of the valve body rod; the outer diameter of the valve body guide post 219 is smaller than the inner diameter of the inner cavity 15 of the housing; the distance from the lower end face 21d of the valve body head to the bottom end face 216 of the valve body is smaller than the distance from the bottom end face 14 of the inner cavity of the housing to the end face 17 of the housing; the external thread 213 of the valve body rod is matched and engaged with the inner thread 11 of the housing.

[0024] In this specific embodiment, the valve body has four waist-shaped holes 214.

[0025] It should be noted that the top sealing ring 22 is installed in the countersunk groove 211 of the valve body head; the inner diameter of the top sealing ring 22 is smaller than the outer diameter of the countersunk groove 211 of the valve body head; and the outer diameter of the top sealing ring 22 is larger than the major diameter of the external thread 213 of the valve body stem.

[0026] It should be noted that the bottom sealing ring 23 is installed in the bottom groove 212 of the valve body; the inner diameter of the bottom sealing ring 23 is smaller than the outer diameter of the bottom groove 212 of the valve body; the outer diameter of the bottom sealing ring 23 is larger than the outer diameter of the valve body guide post 219; and the outer diameter of the bottom sealing ring 23 is larger than the inner diameter of the inner cavity 15 of the housing.

[0027] It should be noted that the plunger 25 includes a plunger head end face 251, a plunger bottom end face 252, a plunger inner cavity bottom end face 253, a plunger inner cavity 254, and a plunger rod portion 255; the outer diameter of the plunger rod portion 255 is smaller than the inner diameter of the valve body large inner cavity 217; the length of the plunger rod portion 255 is smaller than the length of the valve body large inner cavity 217; the diameter of the plunger head end face 251 is larger than the inner diameter of the housing oil inlet 16; the plunger 25 is limited during movement by the housing inner cavity bottom end face 14 and the valve body large inner cavity bottom end face 21a.

[0028] It should be noted that one end of the spring 24 is installed in the small inner cavity 21c of the valve body, and the other end is installed in the inner cavity 254 of the plunger; the outer diameter of the spring 24 is smaller than the inner diameter of the small inner cavity 21c of the valve body and the inner diameter of the inner cavity 254 of the plunger, respectively; after installation, the spring 24 should be in a compressed state, and the coil of the spring 24 should not be squeezed in the extreme compression state.

[0029] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the disclosed individual embodiments. Therefore, the appended claims are hereby clearly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.

[0030] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0031] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0032] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An engine oil pump pressure relief valve structure, comprising an oil pump housing (1) and a pressure relief valve assembly (2), characterized in that: The oil pump housing (1) and the pressure relief valve assembly (2) are provided with an internal thread (11); the oil pump housing (1) is threadedly connected to the valve stem external thread (213) on the pressure relief valve assembly (2) through the internal thread (11); the oil pump housing (1) and the pressure relief valve assembly (2) are sealed by a top sealing ring (22) and a bottom sealing ring (23) fitted on the pressure relief valve assembly (2).

2. The engine oil pump pressure relief valve structure according to claim 1, characterized in that: The connection between the oil pump housing (1) and the pressure relief valve assembly (2) is provided with the following components in sequence from the outside to the inside: housing end face (17), housing internal thread (11), housing inner cavity (15), housing oil drain port (12), housing oil drain groove (13), housing inner cavity bottom end face (14), and housing oil inlet (16); the inner diameter of the housing oil drain groove (13) is larger than the inner diameter of the housing inner cavity (15).

3. The engine oil pump pressure relief valve structure according to claim 2, characterized in that: The pressure relief valve assembly (2) includes a valve body (21), a top sealing ring (22), a bottom sealing ring (23), a spring (24), and a plunger (25); the top sealing ring (22), the bottom sealing ring (23), the spring (24), and the plunger (25) are sequentially mounted on the valve body (21).

4. The engine oil pump pressure relief valve structure according to claim 3, characterized in that: The valve body (21) includes a valve body head recess (211), a valve body bottom recess (212), a valve body stem external thread (213), multiple valve body waist-shaped holes (214), a valve body round hole (215), a valve body bottom end face (216), a valve body large inner cavity (217), a valve body stem (218), a valve body guide post (219), a valve body large inner cavity bottom end face (21a), a valve body small inner cavity bottom end face (21b), a valve body small inner cavity (21c), and a valve body head lower end face (21d); the valve body waist-shaped holes (214) are evenly distributed around the circumference of the valve body stem (218) near the valve body bottom end face (216); the valve body waist-shaped holes (214) and the housing oil drain port (12) The valve body circular hole (215) is located at the end of the valve body rod (218) near the external thread (213) of the valve body rod; the outer diameter of the valve body rod (218) is smaller than the outer diameter of the valve body guide post (219) and the major diameter of the external thread (213) of the valve body rod; the outer diameter of the valve body guide post (219) is smaller than the inner diameter of the inner cavity (15) of the housing; the distance from the lower end face (21d) of the valve body head to the bottom end face (216) of the valve body is smaller than the distance from the bottom end face (14) of the inner cavity of the housing to the end face (17) of the housing; the external thread (213) of the valve body rod is matched and engaged with the internal thread (11) of the housing.

5. The engine oil pump pressure relief valve structure according to claim 4, characterized in that: The valve body has four waist-shaped holes (214).

6. The engine oil pump pressure relief valve structure according to claim 5, characterized in that: The top sealing ring (22) is installed in the groove (211) of the valve body head; the inner diameter of the top sealing ring (22) is smaller than the outer diameter of the groove (211) of the valve body head; the outer diameter of the top sealing ring (22) is larger than the major diameter of the external thread (213) of the valve body stem.

7. The engine oil pump pressure relief valve structure according to claim 6, characterized in that: The bottom sealing ring (23) is installed in the bottom groove (212) of the valve body; the inner diameter of the bottom sealing ring (23) is smaller than the outer diameter of the bottom groove (212) of the valve body; the outer diameter of the bottom sealing ring (23) is larger than the outer diameter of the valve body guide post (219); the outer diameter of the bottom sealing ring (23) is larger than the inner diameter of the inner cavity (15) of the housing.

8. The engine oil pump pressure relief valve structure according to claim 7, characterized in that: The plunger (25) includes a plunger head end face (251), a plunger bottom end face (252), a plunger inner cavity bottom end face (253), a plunger inner cavity (254), and a plunger rod portion (255); the outer diameter of the plunger rod portion (255) is smaller than the inner diameter of the valve body large inner cavity (217); the length of the plunger rod portion (255) is smaller than the length of the valve body large inner cavity (217); the diameter of the plunger head end face (251) is larger than the inner diameter of the housing oil inlet (16); the plunger (25) is limited by the bottom end face (14) of the housing inner cavity and the bottom end face (21a) of the valve body large inner cavity during movement.

9. The engine oil pump pressure relief valve structure according to claim 8, characterized in that: One end of the spring (24) is installed in the small inner cavity (21c) of the valve body, and the other end is installed in the inner cavity (254) of the plunger; the outer diameter of the spring (24) is smaller than the inner diameter of the small inner cavity (21c) of the valve body and the inner diameter of the inner cavity (254) of the plunger; the spring (24) should be in a compressed state after installation, and the spring (24) should not experience coil compression in the extreme compression state.

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