CN110056505B

CN110056505B - Pressure-limiting type internal feedback energy-saving hydraulic steering power-assisted pump

Info

Publication number: CN110056505B
Application number: CN201810048198.9A
Authority: CN
Inventors: 南百军
Original assignee: Jiangsu Delson Automotive Co ltd
Current assignee: Jiangsu Delson Automotive Co ltd
Priority date: 2018-01-18
Filing date: 2018-01-18
Publication date: 2022-03-29
Anticipated expiration: 2038-01-18
Also published as: CN110056505A

Abstract

The invention discloses a pressure-limiting type internal feedback energy-saving hydraulic steering power-assisted pump, which comprises a rear cover and a pump body, wherein a safety valve assembly, an oil distribution disc and a high-pressure oil tank are arranged in the pump body; the space between the stator and the variable ring on the oil distribution disc is a cavity B and a cavity C, wherein the cavity B is communicated with the front cavity of the slide valve, and the cavity C is communicated with the rear cavity of the slide valve; the high-pressure oil tank is provided with a cavity A, one side of the cavity A is communicated with the front cavity of the slide valve, and the other side of the cavity A is communicated with the cavity C. The invention has reasonable design, simple structure and low cost, can automatically adjust the flow according to the load, can automatically adjust the flow according to the running speed of the automobile when being arranged on the automobile, ensures that the flow is large at low speed, and is convenient to steer; the flow is small at high speed, the steering wheel does not float, and the vehicle stability is good. And moreover, the internal circulation of the oil in the hydraulic power steering pump can be reduced, the heating and energy consumption of the oil are reduced, the power consumption of an engine can be reduced, the energy-saving effect is good, and the energy-saving hydraulic power steering pump can be popularized and used.

Description

Pressure-limiting type internal feedback energy-saving hydraulic steering power-assisted pump

Technical Field

The invention belongs to the technical field of hydraulic pumps, and particularly relates to a pressure-limiting internal feedback energy-saving hydraulic power steering pump.

Background

The steering hydraulic power-assisted pump is a key power element of an automobile steering system, and is used for providing power for the steering system and reducing the labor intensity of a driver during steering.

The steering hydraulic booster pump is provided with an oil inlet (an oil suction port) and an oil outlet (an oil pressing port), and the oil inlet is connected with an oil tank through an oil pipe. The oil outlet is connected with the steering engine through an oil pipe. The steering vane pump is also provided with a rotor, a pump shaft and a belt pulley. The engine crankshaft pulley transmits power to the steering pump pulley through a belt. The belt pulley transmits power to the pump shaft. The pump shaft transmits power to the rotor through a spline. The rotor rotates to compress the hydraulic oil sucked from the oil tank to generate a certain pressure, and the pressure is output to the steering engine. The steering engine is internally provided with force transmission parts such as an oil cylinder, a pull rod and the like. The pressure oil pushes the oil cylinder to push the front wheel of the automobile to rotate through a series of force transmission mechanisms, so that the purpose of steering is achieved. Most of the existing steering hydraulic power-assisted pumps are constant displacement pumps and have the defects that oil is easy to heat and energy loss is large.

Disclosure of Invention

The invention aims to provide a pressure-limiting internal feedback energy-saving hydraulic power steering pump to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an energy-saving hydraulic steering helping hand pump of pressure limiting formula internal feedback, includes back lid and pump body, its structural feature lies in: the rear cover is provided with an oil inlet, an oil passing hole A and an oil passing hole B; a safety valve assembly, an oil distribution disc and a high-pressure oil tank are arranged in the pump body, a sliding valve front cavity provided with an oil passing hole C and a damping hole is arranged at the front end of the safety valve assembly, a sliding valve rear cavity provided with an oil passing hole D is arranged at the rear end of the safety valve assembly, and a sliding valve reset spring is connected between the rear end of the safety valve assembly and the pump body; the variable oil distribution disc is provided with a variable ring, a stator, a rotor and a plurality of blades, wherein the surface of the oil distribution disc is provided with an oil absorption window, an oil pressing window and a throttling hole, the variable ring is internally provided with a long groove with a square sealing strip, the variable ring is rotationally connected with the stator through a positioning pin, and the square sealing strip and the positioning pin divide the space between the stator and the variable ring into a cavity B and a cavity C, wherein the cavity B is communicated with a front cavity of a sliding valve through an oil passing hole A, an oil passing hole B and an oil passing hole C, the cavity C is communicated with a rear cavity of the sliding valve through an oil passing hole D, the rotor is rotatably arranged in the stator through a pump shaft, and the blades are slidably arranged in the rotor; the high-pressure oil tank is provided with a cavity A, one side of the cavity A is communicated with the front cavity of the slide valve through an oil passing hole E and a damping hole, the other side of the cavity A is communicated with the cavity C through a throttling hole, and an oil outlet hole is formed in one side of the high-pressure oil tank.

Preferably, the safety valve assembly comprises a slide valve and a safety valve, one side of the slide valve is a cavity with an opening, the safety valve is movably arranged in the cavity, the head end of the safety valve is movably connected with the cavity sequentially through a steel ball, a supporting nail and a safety valve spring, the tail end of the safety valve is provided with a safety valve adjusting nut, the diameter of the safety valve adjusting nut is larger than that of the cavity, and a pressure adjusting gasket is arranged between the safety valve adjusting nut and the slide valve.

Preferably, the stator and the rotor are eccentrically arranged, and a stator return spring is connected between one side of the stator and the variable ring.

Preferably, the number of blades is 11.

Preferably, a round sealing strip is arranged in the square sealing strip.

Preferably, the pressure value of the cavity A is P1, the pressure value of the cavity B is P1, the pressure value of the cavity C is P2, and the values of P1 and P2 are different.

Compared with the prior art, the invention has reasonable design, simple structure and low cost, can automatically adjust the flow according to the load, can automatically adjust the flow according to the running speed of the automobile when being arranged on the automobile, ensures that the flow is large at low speed and the steering is light; the flow is small at high speed, the steering wheel does not float, and the vehicle stability is good. And moreover, the internal circulation of the oil in the hydraulic power steering pump can be reduced, the heating and energy consumption of the oil are reduced, the power consumption of an engine can be reduced, the energy-saving effect is good, and the energy-saving hydraulic power steering pump can be popularized and used.

Drawings

FIG. 1 is a schematic structural view of a rear cover according to the present invention;

FIG. 2 is a schematic view of the structure A-A of FIG. 1;

FIG. 3 is a schematic view of the structure B-B of FIG. 1;

FIG. 4 is a schematic structural view of the oil distribution pan of the present invention;

FIG. 5 is a schematic diagram of the working principle of the present invention;

FIG. 6 is an enlarged partial view of portion I of FIG. 5;

FIG. 7 is a schematic view of the working principle of the rotor of the present invention;

FIG. 8 is a schematic view of the slide valve of the present invention;

in the figure: 1-oil inlet, 2-oil passing hole A, 3-oil passing hole B, 4-oil distribution disc, 6-support nail, 7-slide valve, 8-oil passing hole C, 9-damping hole, 10-slide valve front cavity, 11-oil passing hole D, 12-slide valve rear cavity, 13-variable ring, 14-stator, 15-rotor, 16-blade, 17-oil suction window, 18-oil pressing window, 19-throttling hole, 20-square sealing strip, 21-long groove, 22-positioning pin, 23-B cavity, 24-C cavity, 25-pump shaft, 26-high-pressure oil tank, 27-A cavity, 28-oil passing hole E, 29-oil outlet, 30-return spring, 31-safety valve spring, 32-safety valve, 33-stator return spring, 34-round sealing strip, 35-oil absorption area, 36-oil pressing area, 37-steel ball, 38-valve seat hole, 39-safety valve adjusting nut, and 40-pressure adjusting gasket.

Detailed Description

The invention is further explained below with reference to the drawings, without limiting the scope of protection of the invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-8, the invention provides a technical solution, a pressure-limiting internal feedback energy-saving hydraulic power steering pump, comprising a rear cover and a pump body, wherein the rear cover is provided with an oil inlet 1, an oil passing hole a2 and an oil passing hole B3; the pump body is internally provided with a safety valve assembly, an oil distribution disc 4, a high-pressure oil cabin 26 and the safety valve assembly, the front end of the safety valve assembly is a slide valve front cavity 10 provided with an oil passing hole C8 and a damping hole 9, the rear end of the safety valve assembly is a slide valve rear cavity 12 provided with an oil passing hole D11, and a slide valve return spring 30 is connected between the rear end of the safety valve assembly and the pump body; the oil distribution disc 4 is provided with a variable ring 13, a stator 14, a rotor 15 and a plurality of vanes 16, wherein the surface of the oil distribution disc 4 is provided with an oil suction window 17, an oil pressing window 18 and a throttling hole 19, the variable ring 13 is internally provided with a long groove 21 with a square sealing strip 20, the variable ring 13 is rotatably connected with the stator 14 through a positioning pin 22, the square sealing strip 20 and the positioning pin 22 divide the space between the stator 14 and the variable ring 13 into a cavity B23 and a cavity C24, the cavity B23 is communicated with the front sliding valve cavity 10 through an oil passing hole A2, an oil passing hole B3 and an oil passing hole C8, the cavity C24 is communicated with the rear sliding valve cavity 12 through an oil passing hole D11, the rotor 15 is rotatably arranged in the stator 14 through a pump shaft 25, and the vanes 16 are slidably arranged in the rotor 15; and the high-pressure oil tank 26 is provided with an A cavity 27, one side of the A cavity 27 is communicated with the front cavity 10 of the slide valve through an oil passing hole E28 and a damping hole 9, the other side of the A cavity 27 is communicated with the C cavity 24 through a throttling hole 19, and one side of the high-pressure oil tank 26 is provided with an oil outlet 29.

In the embodiment, the safety valve assembly comprises a slide valve 7 and a safety valve 32, one side of the slide valve 7 is a cavity with an opening, the safety valve 32 is movably arranged in the cavity, the head end of the safety valve 32 is movably connected with the cavity through a steel ball 37, a supporting nail 6 and a safety valve spring 31 in sequence, the tail end of the safety valve 32 is provided with a safety valve adjusting nut 39, the diameter of the safety valve adjusting nut 39 is larger than that of the cavity, and a pressure adjusting gasket 40 is arranged between the safety valve adjusting nut 39 and the slide valve 7.

In the present embodiment, the stator 14 and the rotor 15 are eccentrically disposed, and a stator return spring 33 is connected between one side of the stator 14 and the variable ring 13.

Wherein, in the embodiment, the number of the blades 16 is 11.

In the embodiment, a circular sealing strip 34 is arranged in the square sealing strip 20, and the circular sealing strip 34 provides elastic force, so that the square sealing strip 20 and the positioning pin 22 reliably contact the outer circle of the stator 14 to realize sealing.

In this embodiment, the pressure value of the cavity a 27 is P1, the pressure value of the cavity B23 is P1, the pressure value of the cavity C24 is P2, and the values of P1 and P2 are different.

The working principle of the invention is as follows: referring to fig. 5-6, when the hydraulic power steering pump is operated, the vanes 16 slide within the rotor 15 as the rotor 15 rotates. Because the stator 14 and the rotor 15 are arranged eccentrically, an eccentric distance is formed between the stator 14 and the rotor 15, so that the closed volume formed by the pump body, the oil distribution disc 4, the stator 14, the rotor 15 and the blades 16 is changed continuously. The volume of the oil suction area 35 is increased continuously to form vacuum, hydraulic oil is sucked in through the oil suction window 17 on the oil distribution plate 4, and redundant oil with the volume being reduced continuously (the oil can be considered as incompressible approximately due to the large elastic modulus of the oil) in the oil pressure area 36 is pressed out. Flows into the A cavity 27 through two annular oil pressing windows 18 on the oil distribution plate 4, and the pressure is P1. The pressurized oil in the chamber a 27 is divided into two parts: one portion flows to the spool front chamber 10 through the oil hole E28 and the damping hole 9, and the other portion flows to the C chamber 24 through the orifice 19. The damping hole 6 is used for increasing the flow resistance of oil and reducing hydraulic impact, so that the slide valve 7 moves stably.

When the rotation speed of the hydraulic power steering pump is low, the pressure P1 of the A cavity 27 is low, the slide valve 7 is kept still, and the oil through hole C8 is blocked by the slide valve 7. High-pressure oil can not enter the cavity B23, the stator 14 is kept still, the oil in the cavity A27 is increased along with the increase of the rotating speed, meanwhile, the pressure P1 is increased, the pressure difference between the two ends of the throttling hole 19 is increased,

that is, when P1A1 is equal to or more than P2A1+ K1X1,

wherein P1-cavity 23 pressure

P2-C Chamber 24 pressure

A1-area of action of the slide valve 7

K1-stiffness of spool valve Return spring 30

X1-spool valve return spring 30 preload

The initial equilibrium state of the spool 7 is broken and the spool 7 starts to move toward the rear end. As the rotation speed of the hydraulic power steering pump is further increased, the movement amount of the spool valve 7 is increased, when the front end surface of the spool valve 7 exceeds the edge of the oil passing hole C8, high-pressure oil flows to the B cavity 23 through the oil hole C8, and when P1 is increased to make the oil pass through the oil hole C8

When P1A2 is more than or equal to P2A2+ K2X2,

x2-amount of preload of the stator return spring 33

The stator 14 starts to move towards the direction of the C cavity 24, the eccentricity between the stator 14 and the rotor 15 is reduced, the discharge capacity of the hydraulic steering power-assisted pump is also reduced, and the output oil is also reduced.

When the load increases, the operating pressure of the hydraulic steering assist pump also increases. For example, when the steering wheel is turned to the extreme position, oil is no longer needed in the cylinder of the steering engine, which corresponds to the closing of the oil outlet 29 of the hydraulic power steering pump. At this time, the pressure P2 of the hydraulic steering assist pump increases.

When P2A3 is not less than K3X3

Wherein A3 is the projected area of the contact between the steel ball 37 of the safety valve 32 and the valve seat hole 38

K3-relief valve spring 31 stiffness

X3-amount of preload of relief valve spring 31

The steel ball 37 is pushed away and the oil flows back to the low pressure chamber through the valve seat hole 38, which restricts the further increase of the oil pressure, which is the principle of "pressure limiting".

The hydraulic power steering pump adopts an internal feedback mode, and the stator 14 is pushed to rotate around the positioning pin 22 by means of the oil discharge pressure and the flow of the hydraulic power steering pump, so that the eccentricity of the stator 1 and the rotor 15 is changed, and the displacement and the flow of the hydraulic power steering pump are reduced, therefore, the internal feedback hydraulic power steering pump has a simple structure and low cost. Meanwhile, the flow can be automatically adjusted according to the load, and the flow can be automatically adjusted according to the running speed of the automobile when the automobile is mounted on the automobile, so that the flow is large at low speed, and the steering is light; the flow is small at high speed, the steering wheel does not float, and the vehicle stability is good. And moreover, the internal circulation of the oil in the hydraulic power steering pump can be reduced, the heating and energy consumption of the oil are reduced, the power consumption of an engine can be reduced, the energy-saving effect is good, and the energy-saving hydraulic power steering pump can be popularized and used.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an energy-saving hydraulic steering helping hand pump of pressure limiting formula internal feedback, includes back lid and pump body, its characterized in that:

the rear cover is provided with an oil inlet, an oil passing hole A and an oil passing hole B;

the pump body is internally provided with

The front end of the safety valve assembly is a sliding valve front cavity provided with an oil passing hole C and a damping hole, the rear end of the safety valve assembly is a sliding valve rear cavity provided with an oil passing hole D, and a sliding valve return spring is connected between the rear end of the safety valve assembly and the pump body;

the variable oil distribution disc is provided with a variable ring, a stator, a rotor and a plurality of blades, wherein the surface of the oil distribution disc is provided with an oil absorption window, an oil pressing window and a throttling hole, a long groove with a square sealing strip is arranged in the variable ring, the variable ring is rotationally connected with the stator through a positioning pin, the square sealing strip and the positioning pin divide the space between the stator and the variable ring into a cavity B and a cavity C, the cavity B is communicated with a front cavity of a sliding valve through an oil passing hole A, an oil passing hole B and an oil passing hole C, the cavity C is communicated with a rear cavity of the sliding valve through an oil passing hole D, the rotor is rotatably arranged in the stator through a pump shaft, and the blades are slidably arranged in the rotor;

the high-pressure oil tank is provided with a cavity A, one side of the cavity A is communicated with the front cavity of the sliding valve through an oil passing hole E and a damping hole, the other side of the cavity A is communicated with the cavity C through a throttling hole, and an oil outlet hole is formed in one side of the high-pressure oil tank.

2. The pressure-limiting internal feedback energy-saving hydraulic power steering pump according to claim 1, characterized in that: the safety valve assembly comprises a slide valve and a safety valve, one side of the slide valve is a cavity with an opening, the safety valve is movably arranged in the cavity, the head end of the safety valve is movably connected with the cavity sequentially through a steel ball, a supporting nail and a safety valve spring, the tail end of the safety valve is provided with a safety valve adjusting nut, the diameter of the safety valve adjusting nut is larger than that of the cavity, and a pressure adjusting gasket is arranged between the safety valve adjusting nut and the slide valve.

3. The pressure-limiting internal feedback energy-saving hydraulic power steering pump according to claim 1, characterized in that: the stator and the rotor are eccentrically arranged, and a stator return spring is connected between one side of the stator and the variable ring.

4. The pressure-limiting internal feedback energy-saving hydraulic power steering pump according to claim 1, characterized in that: the number of the blades is 11.

5. The pressure-limiting internal feedback energy-saving hydraulic power steering pump according to claim 1, characterized in that: the square sealing strip is internally provided with a round sealing strip.

6. The pressure-limiting internal feedback energy-saving hydraulic power steering pump according to claim 1, characterized in that: the pressure value of the cavity A is P1, the pressure value of the cavity B is P1, the pressure value of the cavity C is P2, and the values of P1 and P2 are different.