CN110206996B - Oil pump pressure regulating valve - Google Patents

Abstract

A motor oil pump pressure regulating valve relates to the technical field of motor oil pumps, and comprises a pressure regulating valve hole, a plunger, a spring and a plug are arranged in the pressure regulating valve hole, the rear end of the spring extends from the plunger groove and abuts against the plug, a limiting protrusion is fixedly arranged on the outer wall surface of the rear end of the plunger, a limiting step is arranged correspondingly on the rear part of the pressure regulating valve hole, the front end of the pressure regulating valve hole is connected to the oil drain inlet, the inner wall of the pressure regulating valve hole is arranged with an oil drain outlet and the oil drain outlet is located at the front side of the limiting step, a limiting hole is arranged on the shell at the rear end of the pressure limiting valve hole, a limiting pin is penetrated in the limiting hole, under the elastic force of the spring, the plug abuts against the limiting pin backwards, and an oil return hole connecting the pressure regulating valve hole and the oil chamber of the motor oil pump is arranged on the plug. The invention has a simple structure, a stable oil drain process, can achieve a pressure regulating effect relatively quickly, and can also make the plug and the pressure regulating valve fit firmly without the need to set a complex threaded structure.

Description

Oil pump pressure regulating valve

Technical Field

The invention relates to the technical field of oil pumps, and in particular to an oil pump pressure regulating valve.

Background Art

The oil pump is used to ensure that the lubricating oil circulates in the lubrication system and can provide sufficient lubricating oil at all engine speeds to maintain sufficient lubricating oil pressure and ensure engine lubrication. To prevent the oil pressure from being too high, a pressure regulating valve is usually installed in the lubricating oil circuit.

When the pressure regulating valve is assembled on the oil pump, its structure is generally a plunger spring structure. The rear end of the spring is positioned by blocking, and the front end is against the plunger, while the front end of the plunger is against the limit step at the front end of the inner wall of the valve cavity of the pressure regulating valve. The engine oil enters from the front end of the valve cavity of the pressure regulating valve. When the engine oil pressure exceeds the opening pressure of the hydraulic pressure limiting valve, the spring is compressed under the action of the engine oil pressure, the pressure regulating valve opens, and the excess lubricating oil returns to the inlet of the oil pump. Since a limit step needs to be set at the front end of the inner wall of the valve cavity, when the engine oil enters, the size of the oil cross-sectional area will be affected by the limitation of the limit step. In other words, the cross-sectional area of the oil leakage channel is relatively small, and the oil is subjected to high pressure, which will make the oil leakage speed relatively fast, and then produce a certain oil pressure fluctuation, which is not conducive to quickly achieving the effect of stable pressure regulation.

On the other hand, there are two main ways to fix the plug: one is to fix it by relying on the interference fit between the plug and the mounting hole, which has the following main features: this fixing method has the characteristics of simple structure, easy installation, and easy mass production, but the disadvantages are also prominent. Fixing by relying on the interference fit has strict requirements on the installation dimensions of the plug and the bottom hole. Once there is an out-of-tolerance situation, the plug cannot withstand the repeated impact of the pressure regulating valve spring and falls off, which will cause the lubrication system to be unable to establish oil pressure, causing abnormal wear of the moving parts in a short time. The second is threaded screw-in fixing, which is to screw the plug into the bottom hole thread by processing the screw-in thread on the plug and the bottom hole. This structure has high reliability, but the processing and installation are too complicated and the cost is high. Especially when the pressure regulating valve is set on the pump cover, the pump cover often needs to process the arc part to avoid spatial interference, so that the space is not enough to design the installation structure of the plug with thread.

Summary of the invention

The problem to be solved by the present invention is to provide an oil pump pressure regulating valve, which has a simple structure, a stable oil leakage process, can achieve a pressure regulating effect relatively quickly, and can make the plug and the pressure regulating valve fit firmly without setting a complex threaded structure.

In order to solve the above technical problems, the present invention adopts the following technical solutions: an oil pump pressure regulating valve, comprising a pressure regulating valve hole arranged on the housing of the oil pump, a plunger, a spring and a plug are arranged in the pressure regulating valve hole, a plunger groove for accommodating the spring is opened on the rear end surface of the plunger, the front end of the spring extends into the plunger groove and abuts against the groove bottom surface of the plunger groove, the rear end of the spring extends from the plunger groove and abuts against the plug, a limiting protrusion is fixedly arranged on the outer wall surface of the rear end of the plunger, and the rear part of the pressure regulating valve hole corresponds to A limiting step is provided. Under the elastic force of the spring, the limiting protrusion presses forward against the limiting step. The front end of the pressure regulating valve hole is connected to the oil drain inlet. The inner wall of the pressure regulating valve hole is provided with an oil drain outlet and the oil drain outlet is located at the front side of the limiting step. A limiting hole is provided on the shell at the rear end of the pressure limiting valve hole. A limiting pin is passed through the limiting hole. Under the elastic force of the spring, the plug presses backward against the limiting pin. The plug is provided with an oil return hole connecting the pressure regulating valve hole and the oil chamber of the oil pump.

Preferably, the diameter of the oil return hole is larger than the diameter of the limiting pin.

Furthermore, an oil return groove is opened on the rear end face of the plug, the oil return groove is connected to the oil return hole, the length of the oil return groove is smaller than the diameter of the rear end face of the plug, and the width of the oil return groove is consistent with the diameter of the oil return hole.

Furthermore, a guide pin is provided at the front end of the plug for inserting into the spring so as to guide the spring, and the oil return hole extends from the front end surface of the guide pin to the bottom surface of the oil return groove.

Furthermore, a groove is provided between the outer wall surface of the plunger and the front end surface of the limiting protrusion for forming a gap between the outer wall surface of the plunger and the inner wall surface of the pressure regulating valve hole.

Furthermore, a flat washer is provided between the front end of the spring and the bottom surface of the plunger groove.

The beneficial effect of the present invention is that the application of the pressure regulating valve of the structure on the oil pump can save the trouble of machining threaded holes on the housing (pump cover or pump body), so that the housing can meet the corresponding design requirements, thereby achieving the effect of saving space. For example, in order to avoid spatial interference, the arc part can be machined on the pump cover, and there is no need to worry about the installation problem of the blockage in the pressure regulating valve. The blockage is limited by the limit pin, which can fully meet the reliability of the assembly blockage. On the other hand, since the limiting structure of the plunger is arranged at the rear end of the plunger, there is no need to set any redundant structure at the front end of the pressure regulating valve hole where the oil enters, and the oil leakage channel at the front section of the pressure regulating valve hole can be provided with the effect of maximizing the oil cross-sectional area, so that the pressure on the oil when entering the pressure regulating valve hole will be relatively small, so that the oil leakage speed is reduced to a certain extent, thereby reducing the oil pressure fluctuation during the oil leakage process, and then quickly achieving pressure regulation; in addition, since the oil return hole is integrated on the plug, there is no need to design the oil return hole on the pump cover or pump body, which saves axial space and makes the oil leakage smoother.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a housing (pump cover) equipped with an oil pump pressure regulating valve of the present invention;

Fig. 2 is a schematic cross-sectional view of the structure along the line A-A in Fig. 1;

FIG3 is an enlarged schematic diagram of the structure at B in FIG2 ;

FIG. 4 is a schematic diagram of the planar structure of the rear end of the pressure regulating valve hole in the embodiment of the present invention.

The accompanying drawings are marked as follows:

1——Plunger 1a——Plunger groove 1b——Limiting protrusion

1c - groove 2 - spring 3 - plug

3a——Oil return hole 3b——Oil return groove 3c——Guide pin

4 - Limiting step 5 - Oil drain inlet 6 - Oil drain outlet

7——housing 8——limit hole 9——limit pin

10——Flat washer.

DETAILED DESCRIPTION

In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

It should be noted in advance that, in the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, in the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them instead of being in direct contact. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "above", "below", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention.

As shown in Fig. 1-4, an oil pump pressure regulating valve comprises a pressure regulating valve hole arranged on a housing 7 of the oil pump, a plunger 1, a spring 2 and a plug 3 are arranged in the pressure regulating valve hole, a plunger groove 1a for accommodating the spring 2 is opened on the rear end surface of the plunger 1, the front end of the spring 2 extends into the plunger groove 1a and abuts against the bottom surface of the plunger groove 1a, the rear end of the spring 2 extends from the plunger groove 1a and abuts against the plug 3, a limiting protrusion 1b is fixedly arranged on the outer wall surface of the rear end of the plunger 1, and a limiting protrusion 1b is correspondingly arranged at the rear of the pressure regulating valve hole. The limiting protrusion 1b is pressed forward against the limiting step 4 under the elastic force of the spring 2, the front end of the pressure regulating valve hole is connected to the oil drain inlet 5, the inner wall of the pressure regulating valve hole is provided with an oil drain outlet 6 and the oil drain outlet 6 is located at the front side of the limiting step 4, and a limiting hole 8 is provided on the shell 7 located at the rear end of the pressure limiting valve hole, and a limiting pin 9 is passed through the limiting hole 8. Under the elastic force of the spring 2, the plug 3 is pressed backward against the limiting pin 9, and the plug 3 is provided with an oil return hole 3a connecting the pressure regulating valve hole and the oil chamber of the oil pump.

When the oil pump pressure regulating valve provided in the above embodiment is applied to the oil pump, the pressure regulating valve of this structure can save the trouble of machining threaded holes on the housing 7 (the housing 7 in this embodiment refers to the pump cover of the oil pump), so that the housing 7 can meet the corresponding design requirements, thereby achieving the effect of saving space. For example, in order to avoid spatial interference, an arc portion (the arc at C in Figure 1) can be machined on the pump cover, etc., without worrying about the installation problem of the plug 3 in the pressure regulating valve. The plug 3 is limited by the limit pin 9, which can fully meet the reliability of assembling the plug 3; on the other hand, due to the piston 1 The limiting structure is arranged at the rear end of the plunger 1, and therefore, there is no need to arrange any redundant structure at the front end of the pressure regulating valve hole through which the oil enters, but the oil cross-sectional area of the oil leakage channel in the front section of the pressure regulating valve hole can be maximized, so that the pressure to which the oil is subjected when entering the pressure regulating valve hole will be relatively small, so that the oil leakage speed is reduced to a certain extent, thereby reducing the oil pressure fluctuation during the oil leakage process, and then quickly realizing the pressure regulation; in addition, since the plug 3 is integrated with the oil return hole 3a, there is no need to design an oil return hole on the pump cover or the pump body, which saves axial space and makes the oil leakage smoother.

Preferably, the diameter of the oil return hole 3 a is larger than the diameter of the limit pin 9 , so as to avoid the problem of the oil return hole 3 a being blocked when the positions of the oil return hole 3 a and the limit pin 9 coincide with each other.

Furthermore, an oil return groove 3b can be opened on the rear end face of the plug 3, and the oil return groove 3b is connected to the oil return hole 3a, and the width of the oil return groove 3a is consistent with the diameter of the oil return hole 3a. As shown in Figure 4, the length of the oil return groove 3a is smaller than the diameter of the rear end face of the plug 3. In this way, when the position of the oil return groove 3a coincides with that of the limit pin 9, the limit pin 9 can be prevented from being stuck in the oil return groove 3a. By setting the oil return groove 3a perpendicular to the oil return hole 3a, the oil return effect can be significantly improved, that is, the oil can first enter the oil return groove 3a through the oil return hole 3a and then flow out of the oil return groove 3a. In this way, when only one oil return hole 3a is set, the limit pin 9 can avoid excessive obstruction of the oil return hole 3a, and sufficient oil drainage can still be guaranteed through the oil return groove 3a.

Furthermore, the front end of the plug 3 is provided with a guide pin 3c for inserting into the spring 2 so as to guide the spring 2. By directly integrating the guide pin 3c on the plug 3, a better guiding effect can be achieved for the spring 2, thereby optimizing the deflection of the valve, and the oil return hole 3a can be arranged to extend from the front end surface of the guide pin 3c to the bottom surface of the oil return groove 3a.

Furthermore, as shown in Figure 3, a groove 1c is provided between the outer wall surface of the plunger 1 and the front end surface of the limiting protrusion 1b for forming a gap between the outer wall surface of the plunger 1 and the inner wall surface of the pressure regulating valve hole. A small amount of oil can be stored in the groove 1c, thereby playing a good lubrication role in the contact portion between the limiting protrusion 1b and the limiting step 4, and to a certain extent reducing the wear caused by frequent impact contact between the two, thereby improving the service life.

In addition, in this embodiment, a flat washer 10 is provided between the front end of the spring 2 and the bottom surface of the plunger groove 1a.

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

In order to make it easier for ordinary technicians in the field 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 are omitted in this application document. Ordinary technicians in the field should realize that these omitted elements may also constitute the content of the present invention.

Claims (4)

1. An oil pump pressure regulating valve, comprising a pressure regulating valve hole arranged on a housing (7) of the oil pump, wherein a plunger (1), a spring (2) and a plug (3) are arranged in the pressure regulating valve hole, characterized in that: a plunger groove (1a) for accommodating the spring (2) is opened on the rear end surface of the plunger (1), the front end of the spring (2) extends into the plunger groove (1a) and abuts against the bottom surface of the plunger groove (1a), the rear end of the spring (2) extends from the plunger groove (1a) and abuts against the plug (3), a limiting protrusion (1b) is fixedly arranged on the outer wall surface of the rear end of the plunger (1), a limiting step (4) is correspondingly arranged at the rear of the pressure regulating valve hole, under the elastic force of the spring (2), the limiting protrusion (1b) abuts against the limiting step (4) forward, the front end of the pressure regulating valve hole is connected to the oil drain inlet (5), and the An oil drain outlet (6) is arranged on the inner wall of the pressure regulating valve hole and the oil drain outlet (6) is located at the front side of the limit step (4). A limit hole (8) is arranged on the housing (7) at the rear end of the pressure regulating valve hole. A limit pin (9) is inserted into the limit hole (8). Under the elastic force of the spring (2), the plug (3) presses against the limit pin (9) backward. An oil return hole (3a) is arranged on the plug (3) and connects the pressure regulating valve hole with the oil chamber of the oil pump. The diameter of the oil return hole (3a) is larger than the diameter of the limit pin (9). An oil return groove (3b) is arranged on the rear end surface of the plug (3). The oil return groove (3b) is connected with the oil return hole (3a). The length of the oil return groove (3b) is smaller than the diameter of the rear end surface of the plug (3). The width of the oil return groove (3b) is consistent with the diameter of the oil return hole (3a). 2. The oil pump pressure regulating valve according to claim 1 is characterized in that: a guide pin (3c) is provided at the front end of the plug (3) for inserting into the spring (2) so as to guide the spring (2), and the oil return hole (3a) extends from the front end surface of the guide pin (3c) to the bottom surface of the oil return groove (3b). 3. The oil pump pressure regulating valve according to claim 2, characterized in that a groove (1c) is provided between the outer wall surface of the plunger (1) and the front end surface of the limiting protrusion (1b) for forming a gap between the outer wall surface of the plunger (1) and the inner wall surface of the pressure regulating valve hole. 4. The oil pump pressure regulating valve according to any one of claims 1 to 3, characterized in that a flat washer (10) is further provided between the front end of the spring (2) and the bottom surface of the plunger groove (1a).