A shock absorbing device for a pressure limiting valve and a plunger type pressure limiting valve

Abstract

The present invention provides a shock absorbing device for a pressure limiting valve, and a plunger-type pressure limiting valve equipped with the shock absorbing device, wherein the shock absorbing device can be mounted on the rod-shaped portion of the plunger of the pressure limiting valve; the shock absorbing device includes a cylindrical outer shell, a rubber slider and a spring are axially mounted in the through hole of the outer shell, a rear retaining ring is mounted at one end of the outer shell, and a front retaining ring is mounted at the other end; one end of the spring is mounted on the front retaining ring, and the other end is mounted on the rubber slider, and a gap is left between the circumference of the rubber slider and the inner wall of the outer shell; the rear retaining ring, the rubber slider, and the front retaining ring are each provided with an axial through hole for the plunger rod-shaped portion to pass through, and the peripheries of the rear retaining ring and the front retaining ring are hollow structures. The shock absorbing device provided by the present invention is designed based on the working principle of passive shock absorption technology, and can attenuate the oil pressure pulse in the pressure limiting valve, thereby effectively reducing the vibration and noise problems when the pressure limiting valve is working.

Description

Technical Field

[0001] The present invention relates to a lubrication system of an internal combustion engine, in particular to a shock absorbing device for a pressure limiting valve and a plunger type pressure limiting valve equipped with the shock absorbing device. Background Art

[0002] With the rapid development of my country's automotive industry in recent decades, acoustic research has received increasing attention. With increasing customer demand, industrial companies are considering the noise characteristics of their products as a competitive factor in the market. Vehicle noise and vibration control has become a highlight of the automotive industry.

[0003] The design and layout of the lubrication system significantly impacts the performance, reliability, and durability of an internal combustion engine. If the internal combustion engine lubrication system is likened to the human circulatory system, then the oil pump can be compared to the heart. Under various operating conditions of the internal combustion engine, the oil pressure in the lubrication system must meet the requirements of each lubrication and cooling point. The oil pressure must be relatively stable, avoiding sudden fluctuations. Therefore, a pressure-limiting valve is required to maintain a certain oil pressure and prevent transient increases in oil pressure during cold engine starts due to high lubricant viscosity. In short, the function of a pressure-limiting valve is to stabilize oil pressure, reduce oil pressure peaks, prevent excessive pressure in the internal combustion engine's lubrication system, and protect the filter and other related components.

[0004] Existing regulating valve structures can be categorized into two types: steel ball valves and spool valves. Spool valves are further divided into plunger valves and cone valves. Both types operate based on the principle of balancing oil pressure and spring force. Steel ball pressure-limiting valves are not suitable for oil pressure control but can be used as safety valves. Spool pressure-limiting valves provide a damping effect during oil unloading and are widely used. However, the disadvantage of existing technologies is that they cannot effectively reduce vibration and noise caused by oil pressure fluctuations. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a shock absorbing device for a pressure limiting valve, and at the same time provide a plunger type pressure limiting valve equipped with the shock absorbing device, so as to effectively reduce the vibration and noise problems of the pressure limiting valve during operation.

[0006] In order to solve the above technical problems, the technical solution of the shock absorbing device of the present invention is: a shock absorbing device for a pressure limiting valve, which can be mounted on the rod-shaped portion of the pressure limiting valve plunger; the shock absorbing device includes a cylindrical outer shell, a rubber slider and a spring are axially installed in the through hole of the outer shell, a rear retaining ring is installed at one end of the outer shell, and a front retaining ring is installed at the other end; one end of the spring is mounted on the front retaining ring, and the other end is mounted on the rubber slider, and a gap is left between the circumference of the rubber slider and the inner wall of the outer shell; the rear retaining ring, the rubber slider, and the front retaining ring are all provided with an axial through hole for the plunger rod to pass through, and the periphery of the rear retaining ring and the front retaining ring are hollow structures.

[0007] Preferably, the outer contour of the rubber slider is truncated cone-shaped.

[0008] According to the principle of shock absorption technology, an object is added to the original vibration system so that the original vibration system and the added vibration body consume vibration energy through interaction, thereby reducing the vibration intensity of the system. The shock absorption device provided by the present invention is designed based on the working principle of passive shock absorption technology. The rubber slider and spring in the shock absorption device form a "mass-spring" system to consume the energy of vibration, thereby attenuating the oil pressure pulse in the pressure limiting valve, thereby effectively reducing the vibration and noise problems when the pressure limiting valve is working. The above-mentioned shock absorption device can be directly installed on the rod-shaped portion of the pressure limiting valve plunger. The overall design structure is simple, easy to install and low cost.

[0009] The technical solution of the pressure limiting valve of the present invention is: a plunger type pressure limiting valve, including a plunger, the plunger having a rod-shaped portion, a shock absorbing device being installed on the rod-shaped portion of the plunger, the shock absorbing device including a cylindrical shell, a rubber slider and a spring being axially installed in the through hole of the shell, a rear retaining ring being installed at one end of the shell, and a front retaining ring being installed at the other end; one end of the spring is sleeved on the front retaining ring, and the other end is sleeved on the rubber slider, and a gap is left between the circumference of the rubber slider and the inner wall of the shell; the rear retaining ring, the rubber slider, and the front retaining ring are all provided with an axial through hole for the plunger rod-shaped portion to pass through, and the peripheries of the rear retaining ring and the front retaining ring are hollow structures.

[0010] Preferably, the outer contour of the rubber slider is truncated cone-shaped.

[0011] In one embodiment, the plunger includes a disc portion, a rod portion, and a cylindrical portion, wherein the rod portion is located between the disc portion and the cylindrical portion.

[0012] When the pressure limiting valve is opened, the shock absorber can effectively attenuate the fluid pulse during the operation of the oil pump pressure limiting valve through the internal rubber slider and spring, reduce vibration noise and additional abnormal noise, and improve the engine noise performance level.

[0013] The beneficial effects achieved by the present invention are:

[0014] 1) It can attenuate the fluid pulse when the pressure limiting valve is working, effectively reducing its noise problem;

[0015] 2) It can effectively reduce the risk of impact and abnormal noise of the pressure limiting valve and effectively reduce the wear caused by plunger vibration;

[0016] 3) It can be used in the original regulating cavity without changing the pump body structure and can be widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Schematic diagram of the installation structure of the plunger and the shock absorbing device in an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of the structure of the shock absorbing device in an embodiment of the present invention;

[0019] Figure 3 Schematic diagram of the explosion structure of the shock absorbing device in an embodiment of the present invention;

[0020] Figure 4 is a schematic cross-sectional structural diagram of a shock absorbing device in an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the pressure limiting valve structure in an embodiment of the present invention;

[0022] The accompanying drawings are:

[0023] 10——Plunger 20——Valve spring 30——Plug

[0024] 40 - Feedback oil chamber 50 - High-pressure oil port 60 - Low-pressure oil port 70 - Shock absorber 71 - Housing 72 - Rubber slider

[0025] 73——Spring 74——Rear retaining ring 75——Front retaining ring DETAILED DESCRIPTION

[0026] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0027] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the shock absorbing device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meaning of the terms can be understood according to the specific circumstances.

[0029] Example 1

[0030] like Figures 1 to 4As shown, a shock absorbing device for a pressure limiting valve is shown, and the shock absorbing device 70 can be mounted on the rod-shaped portion of the pressure limiting valve plunger 10; the shock absorbing device 70 includes a cylindrical shell 71, and a rubber slider 72 and a spring 73 are axially mounted in the through hole of the shell 71, and a rear retaining ring 74 is mounted at one end of the shell, and a front retaining ring 75 is mounted at the other end; one end of the spring 73 is mounted on the front retaining ring 75, and the other end is mounted on the rubber slider 72, and a gap is left between the circumference of the rubber slider 72 and the inner wall of the shell 71; the rear retaining ring 74, the rubber slider 72, and the front retaining ring 75 are all provided with an axial through hole for the rod-shaped portion of the plunger 10 to pass through, the periphery of the rear retaining ring 74 and the front retaining ring 75 are hollow structures, and the outer contour of the rubber slider 72 is truncated cone-shaped.

[0031] According to the principle of shock absorption technology, an object is added to the original vibration system so that the original vibration system and the added vibration body consume vibration energy through interaction, thereby reducing the vibration intensity of the system. The shock absorption device provided by the present invention is designed based on the working principle of passive shock absorption technology. The rubber slider 72 and spring 73 in the shock absorption device form a "mass-spring" system to consume the energy of vibration, thereby attenuating the oil pressure pulse in the pressure limiting valve, thereby effectively reducing the vibration and noise problems during the operation of the pressure limiting valve. The above-mentioned shock absorption device can be directly installed on the rod-shaped portion of the pressure limiting valve plunger. The overall design structure is simple, easy to install and low cost.

[0032] Example 2

[0033] like Figures 1 to 5 As shown, a plunger-type pressure-limiting valve includes a plunger 10, a valve spring 20, and a plug 30 installed in a valve hole. The plunger 10 includes a disc portion, a rod portion, and a cylindrical portion from left to right. A feedback oil chamber 40 is formed between the disc portion and the inner wall of the valve hole, and a transfer chamber is formed between the rod portion and the side wall of the valve hole. The valve spring 20 is installed between the cylindrical portion and the plug 30. The side wall of the valve hole is provided with a high-pressure oil port 50 and a low-pressure oil port 60; a shock absorber 70 is installed on the rod portion of the plunger 10, and the shock absorber 70 includes a cylindrical shell 71. The shell 71 A rubber slider 72 and a spring 73 are axially installed in the through hole of 1, and a rear retaining ring 74 is installed at one end of the housing, and a front retaining ring 75 is installed at the other end; one end of the spring 73 is sleeved on the front retaining ring 75, and the other end is sleeved on the rubber slider 72, and a gap is left between the circumference of the rubber slider 72 and the inner wall of the housing 71; the rear retaining ring 74, the rubber slider 72, and the front retaining ring 75 are each provided with an axial through hole for the rod-shaped portion of the plunger 10 to pass through, the periphery of the rear retaining ring 74 and the front retaining ring 75 are hollow structures, and the outer contour of the rubber slider 72 is truncated cone-shaped.

[0034] When the oil pressure in the feedback oil chamber 40 reaches the set pressure value, the pressure oil will push the plunger 10 to overcome the preload force of the valve spring 20 and move toward the plug 30 until the high-pressure oil port 50 is connected to the low-pressure oil port 60 through the transfer chamber. At this time, the pressure limiting valve is in the open state, and the high-pressure oil in the high-pressure chamber of the oil pump flows into the low-pressure chamber through the transfer chamber. The shock absorber 70 on the rod-shaped part can effectively attenuate the fluid pulse during the operation of the oil pump pressure limiting valve through the internal rubber slider 72 and spring 73, thereby reducing vibration noise and additional abnormal noise, and improving the engine noise performance level.

[0035] The beneficial effects achieved by this embodiment are:

[0036] 1) It can attenuate the fluid pulse when the pressure limiting valve is working, effectively reducing its noise problem;

[0037] 2) It can effectively reduce the risk of impact and abnormal noise of the pressure limiting valve and effectively reduce the wear caused by plunger vibration;

[0038] 3) It can be used in the original regulating cavity without changing the pump body structure and can be widely used.

[0039] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of protection of the present invention.

[0040] In order to make it easier for those skilled in the art to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements have been omitted in this application document. Those skilled in the art should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. A plunger-type pressure-limiting valve, comprising a plunger (10), wherein the plunger (10) has a rod-shaped portion, characterized in that: A shock absorbing device (70) is installed on the rod-shaped portion of the plunger (10), and the shock absorbing device (70) includes a cylindrical shell (71), a rubber slider (72) and a spring (73) are axially installed in the through hole of the shell (71), a rear retaining ring (74) is installed at one end of the shell (71), and a front retaining ring (75) is installed at the other end; one end of the spring (73) is sleeved on the front retaining ring (75), and the other end is sleeved on the rubber slider (72), and a gap is left between the circumference of the rubber slider (72) and the inner wall of the shell (71); the rear retaining ring (74), the rubber slider (72), and the front retaining ring (75) are all provided with an axial through hole for the rod-shaped portion of the plunger (10) to pass through, and the peripheries of the rear retaining ring (74) and the front retaining ring (75) are hollow structures.

2. The plunger-type pressure-limiting valve according to claim 1, characterized in that: The outer contour of the rubber slider (72) is in the shape of a truncated cone.

3. The plunger-type pressure-limiting valve according to claim 1 or 2, characterized in that: The plunger (10) comprises a disc portion, a rod-shaped portion, and a cylindrical portion, wherein the rod-shaped portion is located between the disc portion and the cylindrical portion.

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