CN213089429U - Variable displacement oil pump without pressure release valve structure - Google Patents

Abstract

The utility model discloses a variable displacement oil pump of no relief valve structure, including the pump body and eccentric ring, the eccentric ring sets up in the inner chamber that the pump body formed, swing pin and pump body coupling are passed through to one side of the outer periphery wall of eccentric ring, opposite side and pump body seal, set up the pressure release structure who replaces the case structure on the pump body. The utility model discloses increase an oil regulation oil duct and an oil discharge reduction chamber and replace original whole relief valve structure inside the oil pump, improve the pressure release capacity of oil pump when reduce cost.

Description

Variable displacement oil pump without pressure release valve structure

Technical Field

The utility model relates to an automobile engine technical field specifically is a variable displacement oil pump that relates to a no relief valve structure.

Background

With the development of modern society, automobiles as an important vehicle have increasingly entered people's lives. The performance and the service life of an engine as a core component of an automobile are directly affected by the quality of a lubricating system of the engine. The lubricating system of traditional automobile engine simply drives the oil pump rotor through the engine pivot and rotates to drive a plurality of blades of locating on the rotor and rotate, through the eccentric settings of oil pump inner chamber and pivot, make the blade rotate the in-process the not cavity of equidimension of volume that a plurality of blades enclose obtain compressing and expansion, finally realize negative pressure oil absorption and high pressure oil delivery.

The traditional oil pump has certain displacement due to structural limitation, and the outlet flow of the oil pump is in direct proportion to the rotating speed of the oil pump. As the engine oil pump speed increases, the outlet flow and pressure of the engine oil pump increase proportionally. Therefore, when the oil pump is operated at a high rotation speed, the oil pumping capacity of the oil pump is excessive, and the oil pressure is high, so that it is necessary to increase the relief valve to release the excessive oil. The pressure relief protection structure of the existing oil pump is designed into a ball valve or valve core structure, namely, when the oil pressure of the system exceeds a bearable range, the ball valve or the valve core is pushed to move to an oil drainage window to start oil drainage.

The prior patent application No. 201910007914.3 discloses a variable displacement vane type oil pump, which comprises an oil pump body, a limiting spring, a control valve core and a rotor. A compression oil cavity, an output oil duct, an overflow oil duct and a pressure relief loop are formed in the engine oil pump body. The pressure relief loop comprises a first-stage compression oil duct, a second-stage compression oil duct and a control cavity. The control valve core is composed of a first valve block, a first connecting rod, a second valve block, a second connecting rod and a third valve block which are integrally formed. By designing the pressure relief loop, the oil pump can provide lower oil pressure relative to the existing oil pump at lower rotating speed so as to reduce the friction loss of the oil pump and save mechanical power. However, the following disadvantages exist with this solution: the requirement on the machining and manufacturing of the valve core structure is high, and if the machining is not in place, the problems of valve core clamping stagnation and the like exist, so that the engine oil pump is directly failed and the engine is damaged.

Therefore, a new variable displacement oil pump is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the variable displacement oil pump without the pressure release valve structure is provided, and only an oil outlet adjusting oil duct and an oil outlet emission reduction cavity are added in the oil pump to replace the original whole pressure release valve structure, so that the pressure release capacity of the oil pump is improved while the cost is reduced.

The specific technical scheme is as follows:

the variable displacement oil pump without the pressure release valve structure comprises a pump body and an eccentric ring, wherein the eccentric ring is arranged in an inner cavity formed by the pump body, one side of the outer circumferential wall of the eccentric ring is connected with the pump body through a swing pin, the other side of the outer circumferential wall of the eccentric ring is sealed with the pump body, and the pump body is provided with the pressure release structure for replacing a valve core structure.

Compared with the prior art, the utility model discloses set up the pressure release structure who replaces the case structure on the pump body, cancelled the structure of traditional case pressure release for the oil pump structure is compacter, the part cost of greatly reduced oil pump. The original ball valve or valve core structure needs to process a pressure relief valve hole on the pump body of the oil pump, but the processing and manufacturing requirements of the valve core hole are high, and if the processing is not in place, the problems of valve core clamping stagnation, ball valve conical surface leakage and the like exist, so that the oil pump is directly caused to lose efficacy and an engine is damaged.

Preferably, the pressure relief structure comprises an oil outlet emission reduction cavity, an oil outlet adjusting oil duct and an oil outlet cavity which are sequentially communicated, and the oil outlet emission reduction cavity is communicated with an oil outlet of the oil pump.

Furthermore, an emission reduction swing arm is arranged on the eccentric ring and close to the swing pin, and the emission reduction swing arm, the swing pin and the inner cavity of the pump body form an oil outlet emission reduction cavity.

The opposite face department that lies in the swinging pin on the eccentric ring is equipped with the elastic component swing arm, set up the elastic component on the elastic component swing arm, the elastic component offsets with the pump body inner chamber. The elastic piece is a spring.

The emission reduction swing arm, the elastic part swing arm and the inner cavity of the pump body form a feedback emission reduction cavity.

The elastic piece swing arm, the swing pin and the inner cavity of the pump body form an increase and discharge cavity.

The emission reduction swing arm and the elastic part swing arm are respectively sealed with the pump body through sealing parts.

When the pressure of an oil outlet of the oil pump is too high, oil at the oil outlet enters the newly-added oil outlet emission reduction cavity to push the eccentric ring to move, the oil pump starts to change the emission, and the pressure is reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

in the attached drawings, 1 is a pump body; 2. an eccentric ring; 3. a swing pin; 4. an oil outlet emission reduction cavity; 5. an oil outlet regulating oil passage; 6. an oil outlet cavity; 7. emission reduction swing arms; 8. an elastic piece swing arm; 9. an elastic member; 10. a feedback emission reduction chamber; 11. an increase and discharge cavity; 12. and a seal.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, a variable displacement oil pump without a relief valve structure is shown, which includes a pump body 1, an eccentric ring 2, a rotor eccentrically disposed with an inner cavity of the eccentric ring 2, and an adjusting mechanism for adjusting an eccentric distance between the eccentric ring 2 and the rotor. The eccentric arrangement referred to herein means that the geometric center of the inner cavity of the eccentric ring 2 does not coincide with the axis of the rotor, and therefore the vanes circumferentially arranged around the axis of the rotor divide the inner cavity of the eccentric ring 2 into a plurality of cavities of different volumes, whereby the different cavities are continuously compressed and expanded when the rotor rotates with the vanes, and the size of the eccentric distance determines the volume difference between the different cavities, so that the larger the eccentric distance, the larger the degree of compression and expansion.

The eccentric ring 2 is arranged in an inner cavity formed by the pump body 1, one side of the outer circumferential wall of the eccentric ring 2 is connected with the pump body 1 through a swing pin 3, and the other side of the outer circumferential wall of the eccentric ring 2 is sealed with the pump body 1. Through the swing pin 3, the swing of the eccentric ring 2 can be realized, so that the eccentricity can be changed, the compression and expansion degree of the oil liquid is changed, and the change of the oil liquid discharge capacity is realized. The pump body 1 is provided with a pressure relief structure for replacing a valve core structure, and a traditional valve core pressure relief structure is omitted, so that the structure of the oil pump is more compact, and the part cost of the oil pump is greatly reduced. The original ball valve or valve core structure needs to process a pressure relief valve hole on the oil pump body 1, but the processing and manufacturing requirements of the valve core hole are high, and if the processing is not in place, the problems of valve core clamping stagnation, ball valve conical surface leakage and the like exist, so that the engine oil pump is directly failed and the engine is damaged.

Specifically, the pressure relief structure comprises an oil outlet emission reduction cavity 4, an oil outlet adjusting oil duct 5 and an oil outlet cavity 6 which are sequentially communicated, and the oil outlet emission reduction cavity 4 is communicated with an oil outlet of the oil pump. An emission reduction swing arm 7 is arranged on the eccentric ring 2 and close to the swing pin 3, the emission reduction swing arm 7, the swing pin 3 and the inner cavity of the pump body 1 form an oil outlet emission reduction cavity 4, and the emission reduction swing arm 7 is sealed with the pump body 1 through a sealing piece 12; an elastic part swing arm 8 is arranged on the eccentric ring 2 and positioned at the opposite surface of the swing pin 3, the elastic part swing arm 8 is sealed with the pump body 1 through a sealing part 12, an elastic part 9 is arranged on the elastic part swing arm 8, the elastic part 9 is abutted against the inner cavity of the pump body 1, and in the embodiment, the elastic part 9 is a spring; the emission reduction swing arm 7, the elastic part swing arm 8 and the inner cavity of the pump body 1 form a feedback emission reduction cavity 10; the elastic piece swing arm 8, the swing pin 3 and the inner cavity of the pump body 1 form a row increasing cavity 11. After the rotor rotates, the plurality of blades arranged on the rotor are driven to rotate, and the emission reduction cavity and the emission increasing cavity 11 with different volumes are compressed and expanded in the rotating process of the blades through the eccentric arrangement of the inner cavity of the oil pump and the rotating shaft, so that negative-pressure oil absorption and high-pressure oil transportation are finally realized.

The utility model discloses at the inside oil regulation oil duct 5 and the reduction of discharging chamber 4 that increases of oil pump and replace original whole relief valve structure, when oil pump oil-out pressure was too high promptly, the oil of oil-out enters into newly-increased oil reduction of discharging chamber 4, promotes eccentric ring 2 and removes, and the oil pump begins to become to arrange, pressure reduction.

The utility model eliminates a plurality of parts such as a ball valve (valve core), a spring, a bowl-shaped plug (screw plug) and the like, so that the structure of the oil pump is more compact, and the part cost of the oil pump is greatly reduced; the machining of a pressure relief valve hole in the oil pump body 1 is cancelled, the investment of machining equipment such as a cutter and the like is reduced, and the cost is reduced; equipment such as press mounting of bowl-shaped plugs, screw plug screwing and the like in an assembly line is omitted, and investment of assembly equipment is reduced; the problem of failure of the oil pump caused by the problems of valve core clamping stagnation, conical surface leakage and the like is solved.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (8)

1. The utility model provides a variable displacement oil pump of no relief valve structure, includes the pump body (1) and eccentric ring (2), eccentric ring (2) set up in the inner chamber that the pump body (1) formed, one side of eccentric ring (2) outer periphery is connected with the pump body (1) through swinging pin (3), and the opposite side is sealed with the pump body (1), its characterized in that: the pump body (1) is provided with a pressure relief structure for replacing a valve core structure.

2. The variable displacement oil pump without the relief valve structure according to claim 1, characterized in that: the pressure relief structure comprises an oil outlet emission reduction cavity (4), an oil outlet adjusting oil duct (5) and an oil outlet cavity (6) which are sequentially communicated, and the oil outlet emission reduction cavity (4) is communicated with an oil outlet of the oil pump.

3. The variable displacement oil pump of the relief-valve-less structure according to claim 2, characterized in that: an emission reduction swing arm (7) is arranged on the eccentric ring (2) and close to the swinging pin (3), and the emission reduction swing arm (7), the swinging pin (3) and the inner cavity of the pump body (1) form an oil outlet emission reduction cavity (4).

4. The variable displacement oil pump without the relief valve structure according to claim 3, characterized in that: the opposite face department that lies in swing pin (3) on eccentric ring (2) is equipped with elastic component swing arm (8), set up elastic component (9) on elastic component swing arm (8), elastic component (9) offset with pump body (1) inner chamber.

5. The variable displacement oil pump without the relief valve structure according to claim 4, characterized in that: the emission reduction swing arm (7), the elastic part swing arm (8) and the inner cavity of the pump body (1) form a feedback emission reduction cavity (10).

6. The variable displacement oil pump without the relief valve structure according to claim 4, characterized in that: the elastic piece swing arm (8), the swing pin (3) and the inner cavity of the pump body (1) form a row increasing cavity (11).

7. The variable displacement oil pump without the relief valve structure according to claim 4, characterized in that: the emission reduction swing arm (7) and the elastic piece swing arm (8) are respectively sealed with the pump body (1) through a sealing piece (12).

8. The variable displacement oil pump without the relief valve structure according to claim 4, characterized in that: the elastic piece (9) is a spring.

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