CN112360589B

CN112360589B - Full-variable displacement oil pump integrated with safety valve functional slide block

Info

Publication number: CN112360589B
Application number: CN202011285880.3A
Authority: CN
Inventors: 杨正中; 许仲秋; 刘光明; 佘笑梅
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Oil Pump Co Ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2022-03-11
Anticipated expiration: 2040-11-17
Also published as: CN112360589A

Abstract

A full-variable displacement oil pump integrating a safety valve function sliding block relates to the technical field of oil pumps and comprises a pump body, a pump cover, a pump shaft, a rotor, a sliding block and a spring, wherein a rotating pin is connected between the front end of the sliding block and the inner wall of the pump body, a main feedback cavity is arranged between the right side of the sliding block and the inner wall of the pump body, an auxiliary feedback cavity is arranged between the front end of the sliding block and the inner wall of the pump body and communicated with an outlet of the pump, the main feedback cavity and the auxiliary feedback cavity are mutually independent, the main feedback cavity is connected to a control valve through a first oil path and communicated with an oil pan through the control valve, the outlet of the pump is connected to the control valve through a second oil path and communicated with an engine main oil path through the control valve, and the control valve can separate the main feedback cavity from the oil pan and enable the main feedback cavity to be communicated with the engine main oil path and the second oil path, so that the oil pressure in the main feedback cavity is changed to push the sliding block to move to realize variable displacement. The invention can simplify the structure of the oil pump and the design of the oil duct, save the traditional safety valve structure and reduce the difficulty and the cost of processing and assembling.

Description

Full-variable displacement oil pump integrated with safety valve functional slide block

Technical Field

The invention relates to the technical field of oil pumps, in particular to a full-variable displacement oil pump integrated with a safety valve function sliding block.

Background

The traditional constant-displacement oil pump has the advantages that the oil displacement is small when the engine speed is low, insufficient lubrication is easily caused, the oil displacement is too high when the engine speed is high, and power waste is easily caused. The variable-displacement oil pump can optimize the oil displacement according to the oil pressure requirement and the friction requirement so as to achieve the aim of accurately controlling a lubricating system and reduce the power loss of the oil pump.

The existing variable displacement oil pump usually needs to be provided with a safety valve on a pump body to avoid overhigh oil pressure of the system, the working principle of the safety valve is that a plunger or a steel ball part of the safety valve is utilized, the safety valve moves and pushes a spring when receiving the oil pressure, so that an oil drain hole is opened to release the pressure, the oil pump and the oil duct of the system are complicated in design due to the existence of the parts, the oil pump and the oil duct of the system are complicated in processing, manufacturing and assembling links, and the processing material quantity and the cost are increased.

Disclosure of Invention

The invention aims to provide a full-variable displacement oil pump integrated with a safety valve functional slide block, so that the structure of the oil pump and the design of an oil passage are simplified, the traditional safety valve structure is omitted, and the difficulty and the cost of processing and assembling are reduced.

In order to solve the technical problems, the invention adopts the following technical scheme: a full variable displacement oil pump integrating a safety valve function slide block comprises a pump body, a pump cover, a pump shaft, a rotor, a slide block and a spring, a rotating pin is connected between the front end of the sliding block and the inner wall of the pump body, a main feedback cavity is arranged between the right side of the sliding block and the inner wall of the pump body, an auxiliary feedback cavity is arranged between the front end of the sliding block and the inner wall of the pump body and is communicated with the outlet of the pump, the main feedback cavity and the auxiliary feedback cavity are mutually independent, the main feedback cavity is connected to a control valve through a first oil path and is communicated with an oil pan through the control valve, the pump outlet is connected to the control valve through a second oil path and communicated with the main oil gallery of the engine through the control valve, the control valve can cut off the main feedback cavity and the oil pan and enable the main feedback cavity to be communicated with the main oil duct and the second oil duct of the engine, so that the oil pressure in the main feedback cavity is changed to push the sliding block to move to achieve variable displacement.

Preferably, the control valve is a proportional control valve, the proportional control valve includes a valve hole, a valve core arranged in the valve hole and electromagnetically controlled, and P ports, a port a and a port T which are sequentially arranged from left to right along the length direction of the valve hole at intervals, the port P is communicated with a main oil passage of the engine, the port a is communicated with the first oil passage, the port T is communicated with an oil pan, and the valve core is moved to enable the port a to be communicated with the port P and to block the port a from the port T, or to enable the port a to be communicated with the port T and to block the port a from the port P from the port a.

More preferably, the second oil path is directly communicated with the port P or is communicated with the port P after passing through an oil filter and an engine cooling system.

More preferably, the front end of slider is equipped with the lug, the feedback oil groove has been seted up to the up end of lug, the front end of feedback oil groove extends to the front end of lug and is and opens wide form, set up the oil drainage groove that the intercommunication pump was exported and is fed back the oil groove on the pump body.

More preferably, the rear end of slider is equipped with the main seal with the contact of pump body inner wall, the right-hand member of lug is equipped with the vice sealing member with the contact of pump body inner wall, is located slider and pump body clearance between main seal and the vice sealing member form the main feedback chamber, are located lug and pump body clearance and the feedback oil groove between rotatory round pin and the vice sealing member form jointly vice feedback chamber.

More preferably, the rotating pin is a hollow tubular body, and a high-pressure oil groove arranged at the bottom of the pump body extends to the lower part of the rotating pin.

More preferably, the inner wall of the pump body on the left side of the sliding block is provided with a limiting bulge, and the sliding block can abut against the limiting bulge when swinging so as to change the displacement to the minimum value.

The invention has the beneficial effects that: because the front end of the sliding block is provided with the auxiliary feedback cavity communicated with the outlet of the pump, when the pressure at the outlet of the pump reaches a certain value, oil can enter the auxiliary feedback cavity and push the sliding block to move, on one hand, the auxiliary feedback cavity has the effect of a pressure relief cavity, on the other hand, the displacement of the pump can be properly reduced after the sliding block moves, so that the pressure at the outlet of the pump is avoided being overhigh, the effective self-protection effect can be achieved under extreme (cold start) pressure, the structure replaces the traditional safety valve structure with parts such as a plunger or a steel ball, the structure and the design of an oil pump can be simplified, the difficulty and the cost of processing and assembling are reduced, and the reliability of the oil pump is improved.

Drawings

FIG. 1 is a schematic view of the overall structure in the high-voltage mode according to an embodiment of the present invention;

FIG. 2 is a schematic view of the overall structure in the low-pressure mode according to the embodiment of the present invention;

FIG. 3 is a schematic diagram showing the overall structure of the second oil passage in the embodiment when the second oil passage is communicated with the port P through the oil filter and the engine cooling system;

fig. 4 is an exploded view of the entire structure in the embodiment.

The reference signs are:

1-pump body 2-pump cover 3-pump shaft

4-rotor 5-slide block 5 a-projection

5 b-feedback oil groove 5 c-main seal 5 d-secondary seal

6-spring 7-rotary pin 8-main feedback cavity

9-auxiliary feedback cavity 10-pump outlet 11-first oil circuit

12-control valve 12 a-valve core 13-second oil path

14-an engine main oil gallery 15-an oil guide groove 16-a limiting bulge.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

It should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used broadly in the present invention, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Further, in the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not in direct contact, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.

As shown in fig. 1-4, the fully variable displacement oil pump integrating the safety valve function sliding block comprises a pump body 1, a pump cover 2, a pump shaft 3, a rotor 4, a sliding block 5 and a spring 6, wherein a rotating pin 7 is connected between the front end of the sliding block 5 and the inner wall of the pump body 1, a main feedback cavity 8 is arranged between the right side of the sliding block 5 and the inner wall of the pump body 1, an auxiliary feedback cavity 9 is arranged between the front end of the sliding block 5 and the inner wall of the pump body 1, the auxiliary feedback cavity 9 is communicated with a pump outlet 10, the main feedback cavity 8 and the auxiliary feedback cavity 9 are mutually independent, the main feedback cavity 8 is connected to a control valve 12 through a first oil path 11 and is communicated with an oil pan through a control valve 12, the pump outlet 10 is connected to the control valve 12 through a second oil path 13 and is communicated with a main oil path 14 of an engine through the control valve 12, the control valve 12 can partition the main feedback cavity 8 from the oil pan and enable the main feedback cavity 8 to be communicated with the main oil path 14 of the engine and the second oil path 13 of the engine, thereby changing the oil pressure in the main feedback chamber 8 to push the slider 5 to move for realizing variable displacement.

When the fully variable displacement oil pump with the safety valve function integrated sliding block works in a normal high-pressure state, the first oil path 11 is communicated with the oil pan, no oil pressure is basically formed in the main feedback cavity 8, the sliding block 5 is kept at the maximum displacement position, oil is continuously output to the main oil path of the engine through the pump outlet 10, when the fully variable displacement oil pump works in a low-pressure state, a channel between the first oil path 11 and the oil pan is cut off through the control valve 12, the first oil path 11 is communicated with the main oil path 14 of the engine and the second oil path 13, at the moment, the oil can enter the main feedback cavity 8 from the first oil path 11 and push the sliding block 5 to move, the oil pressure in the auxiliary feedback cavity 9 can also jointly act on the sliding block 5, and therefore the displacement of the pump is reduced.

Specifically, the control valve 12 is a proportional control valve, which includes a valve hole, a valve core 12a disposed in the valve hole and electromagnetically controlled by an electromagnetic control, a port P, a port a, and a port T sequentially disposed from left to right along a length direction of the valve hole at an interval, the port P being communicated with a main oil gallery 14 of the engine, the port a being communicated with a first oil passage 11, the port T being communicated with an oil pan, and the valve core 12a being moved to communicate the port a with the port P and block the port a from the port a (as shown in fig. 2), so that oil in the main feedback chamber 8 is pressurized and push the slider 5 to enter a low-pressure operating state, thereby reducing a displacement, or to communicate the port a with the port T and block the port a (as shown in fig. 1), so that oil in the main feedback chamber 8 is discharged from the first oil passage 11 into the oil pan, thereby restoring the slider 5 to perform a high-pressure operating state, increasing a displacement, and precisely controlling an opening degree of each port by a proportional control valve PWM, so that the oil pump outputs different pump outlet pressures, thereby realizing full variable displacement.

It should be noted that, as those skilled in the art should know, the proportional control valve is a valve structure existing in the prior art, and its working principle is to control the flow rate by changing the on-off relationship among the ports P, a and T and the opening of the inlet and outlet during communication through electromagnetically controlling the position of the regulating valve core 12a, so as to guide the flow direction of the system oil under the states of 0% PWM duty ratio, MidPWM duty ratio, 100% PWM duty ratio, etc., so as to change the displacement between the maximum, maximum-minimum, and minimum states.

Preferably, the second oil path 13 is directly communicated with the port P or the second oil path 13 is communicated with the port P after passing through an oil filter and an engine cooling system, when the second oil path 13 is directly communicated with the port P, the proportional control valve is arranged on the pump body 1, and when the second oil path 13 is communicated with the port P after passing through the oil filter and the engine cooling system (as shown in fig. 3), the proportional control valve can be arranged on the engine cylinder body besides the pump body 1, thereby reducing the complexity of the structure of the oil pump.

As more preferably, slider 5's front end is equipped with lug 5a, feedback oil groove 5b has been seted up to lug 5 a's up end, feedback oil groove 5 b's front end extends to lug 5 a's front end and is open the form, the oil groove 15 that draws of intercommunication pump export 10 and feedback oil groove 5b has been seted up on the pump body 1, this simple structure, because slider 5 front end is close to pump export 10, consequently can easily directly introduce feedback oil groove 5b with the fluid of pump export 10 through drawing oil groove 15, the very big overall structure design who has simplified vice feedback chamber 9.

On the basis, the rear end of the sliding block 5 is provided with a main sealing piece 5c which is in contact with the inner wall of the pump body 1, the right end of the convex block 5a is provided with an auxiliary sealing piece 5d which is in contact with the inner wall of the pump body 1, a gap between the sliding block 5 and the auxiliary sealing piece 5d, which is positioned between the main sealing piece 5c and the auxiliary sealing piece 5d, and the pump body 1 and the feedback oil groove 5b form the auxiliary feedback cavity 9 together.

Preferably, the rotating pin 7 is a hollow tubular body, and a high-pressure oil groove arranged at the bottom of the pump body 1 extends to the lower part of the rotating pin 7, so that after entering the high-pressure oil groove, the high-pressure oil extruded out of the rotor 4 can enter the pump outlet 10 according to the original oil path and can also pass through the rotating pin 7 to enter the pump outlet 10, and the efficiency of pumping the high-pressure oil is improved.

In addition, in this embodiment, more preferably, a limit protrusion 16 is disposed on the inner wall of the pump body 1 on the left side of the slider 5, and the slider 5 can abut against the limit protrusion 16 when swinging, so that the displacement is changed to the minimum value, at this time, the maximum eccentricity of the slider 5 is 88%, and the minimum displacement of the pump can be kept to be about 12% of the maximum value.

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims

1. Full variable displacement oil pump of integrated relief valve function slider, including the pump body (1), pump cover (2), pump shaft (3), rotor (4), slider (5) and spring (6), be connected with rotatory round pin (7) between the front end of slider (5) and the pump body (1) inner wall, be equipped with main feedback chamber (8), its characterized in that between the right side of slider (5) and the pump body (1) inner wall: an auxiliary feedback cavity (9) is arranged between the front end of the sliding block (5) and the inner wall of the pump body (1), the auxiliary feedback cavity (9) is communicated with a pump outlet (10), the main feedback cavity (8) and the auxiliary feedback cavity (9) are mutually independent, the main feedback cavity (8) is connected to a control valve (12) through a first oil way (11) and communicated with an oil pan through the control valve (12), the pump outlet (10) is connected to the control valve (12) through a second oil way (13) and communicated with an engine main oil way (14) through the control valve (12), the control valve (12) can separate the main feedback cavity (8) from the oil pan and enable the main feedback cavity (8) to be communicated with the engine main oil way (14) and the second oil way (13), so that the oil pressure in the main feedback cavity (8) is changed to push the sliding block (5) to move to realize variable displacement, and the control valve (12) is a proportional control valve, the proportional control valve comprises a valve hole, a P port, an A port and a T port which are arranged in the valve hole at intervals from left to right in sequence along the length direction of the valve hole through an electromagnetic control valve core (12 a), wherein the P port is communicated with an engine main oil duct (14), the A port is communicated with a first oil way (11), the T port is communicated with an oil pan, the valve core (12 a) is moved to enable the A port and the P port to be communicated and separate the A port and the T port or enable the A port and the T port to be communicated and separate the A port and the P port, the second oil way (13) is directly communicated with the P port or the second oil way (13) is communicated with the P port after passing through an oil filter and an engine cooling system, a convex block (5 a) is arranged at the front end of a sliding block (5), a feedback oil groove (5 b) is arranged on the upper end face of the convex block (5 a), and the front end of the feedback oil groove (5 b) extends to the front end of the convex block (5 a) and is open, set up the oil groove (15) that draws that the intercommunication pump was exported (10) and is fed back oil groove (5 b) on the pump body (1), the rear end of slider (5) is equipped with main seal (5 c) with the contact of the pump body (1) inner wall, the right-hand member of lug (5 a) is equipped with vice seal (5 d) with the contact of the pump body (1) inner wall, is located slider (5) and the clearance of the pump body (1) between main seal (5 c) and vice seal (5 d) form main feedback chamber (8), are located lug (5 a) and the clearance of the pump body (1) and feedback oil groove (5 b) between rotatory round pin (7) and vice seal (5 d) form jointly vice feedback chamber (9).

2. The fully variable displacement oil pump with integrated relief valve function slider of claim 1, wherein: the rotary pin (7) is a hollow tubular body, and a high-pressure oil groove formed in the bottom of the pump body (1) extends to the position below the rotary pin (7).

3. The fully variable displacement oil pump with integrated relief valve function slider of claim 1, wherein: be located be equipped with spacing arch (16) on the pump body (1) inner wall on slider (5) left side, thereby slider (5) can support against in spacing arch (16) when the swing makes the discharge capacity change to the minimum.