CN206691193U - A kind of hydraulic steering gear with damping hole check valve - Google Patents

Abstract

The utility model discloses a kind of hydraulic steering gear with damping hole check valve, including steering gear and pressure duct, check valve is provided between steering gear and pressure duct, steering gear, check valve and pressure duct realize connection fastening and the sealing between three by screw thread, steering gear O-ring and pressure duct O-ring；A spring is provided with the valve pocket of check valve, the initial contact of one-way piston and piston seat is kept by spring, is provided with the damping hole of a taper at the center of one-way piston, the very little of the pre compressed magnitude setting of spring is to reduce the resistance that fluid normally circulates.The utility model, which has the advantages that effectively to suppress the pressure oscillation of hydraulic system, improves pressure oscillation in hydraulic circuit brings the impact of steering wheel, improves the control stability of hydraulic power-assist steering system, the manipulation quality for lifting vehicle, one-way valve structures and simply, with the matching of steering gear have low universality, cost, wide market, good reliability.

Description

A kind of hydraulic steering gear with damping hole check valve

Technical field

Hydraulic booster vehicle steering system is the utility model is related to, more particularly, to a kind of hydraulic pressure with damping hole check valve Steering gear.

Background technology

For hydraulic power-assist steering system as the assist type for being generally applicable to various types of vehicles, permanent is present in automobile city , with the continuous maturation of hydraulic technique, hydraulic power-assist steering system has obtained development at full speed.Universality and reliability are high Advantage makes it still remain the huge market share in the epoch of the electric boosted rapid development of whole automobile market, with automobile The arrival of intellectualization times and energy-saving and emission-reduction policy increasingly strict requirements, traditional being also adapted to property of mechanical-hydraulic force aid system Upgraded, electronic hydraulic power-assisted steering system occur, can equally meet the intelligentized demand of vehicle, future electronic Hydraulic power-assist steering system is expected to the competitiveness of further lifting hydraulic power-assist steering system.

Now as user deepens continuously to automobile understanding, control stability, vibration characteristics, smooth-going of the market to automobile Property proposes higher requirement, and new hydraulic power-assist steering system will also meet this requirement.Existing hydraulic power-assist steering system Include the fastening connection piece of power source, steering liquid, fluid reservoir, pipeline, power steering pump, steering gear and correlation.Power steering pump The steering liquid provided by pipeline by fluid reservoir is provided, turned the low pressure of reception under the driven by energy that engine or motor provide High pressure is changed into liquid and turns to liquid, is conveyed to the hydraulic steering gear with damping hole check valve by the road, passes through turning in steering gear For pressure direction of the valve control action on rack piston so as to realize the leftward or rightward power steering of vehicle, removing flows to hydraulic pressure Remaining part is then back to fluid reservoir again by pipeline outside the steering liquid of steering gear hydraulic cylinder, and so on circulates.By It is very complicated in the real driving cycle of vehicle, the pavement behavior being related to is also ever-changing, when vehicle is in the attached of road surface The situation of wearing changes or tire runs into the steering force turned to when bump and will changed, corresponding hydraulic pressure system The pressure of system loop inner will also change, bright to vehicle steering mechanism by being formed when this change reaches to a certain degree Aobvious impulsive force, by the dynamics being reflected directly in needed for Vehicular turn change.It is subjective, the change of this steering dynamics for The control stability of vehicle is unfavorable, can substantially reduce the handling quality of vehicle, equally also can be to related in hydraulic system Seal proposes higher requirement.

The content of the invention

The purpose of this utility model is to provide a kind of pressure oscillation that can effectively suppress hydraulic system, lifts vehicle Manipulate quality, the hydraulic steering gear with damping hole check valve.

What the purpose of this utility model was realized in：

A kind of hydraulic steering gear with damping hole check valve, including hydraulic steering gear and pressure duct, in pressure duct The pipeline oil-out outer wall of pipeline body is provided with externally threaded hollow bolt, is characterized in：Between steering gear and pressure duct Provided with check valve, the straight-through valve pocket in left and right is provided with the unidirectional valve body of check valve, in going out from check valve for unidirectional valve body Hydraulic fluid port start several third level step outer walls be provided with the first order stepped inner walls of the steering gear oil inlet of steering gear in The external screw thread that screw thread coordinates, it is provided with the inwall of the check valve oil inlet of unidirectional valve body on the hollow bolt with pressure duct The internal thread that coordinates of external screw thread, the check valve oil-out of check valve is external in the steering gear oil inlet of steering gear by screw thread Place, the check valve oil inlet of check valve are inscribed at the pipeline oil-out of pressure duct by screw thread so that steering gear and high pressure Pipeline is linked together by check valve；Outer wall, the inwall of unidirectional valve body be it is step-like, it is fuel-displaced from check valve in valve pocket By being interference fitted the spring maintainance block provided with tubular on the second level stepped inner walls that mouth starts counting up, in spring maintainance block inner chamber Provided with a precompressed spring, spring keeps closing with the approximately axial installation of unidirectional valve body under the constraint of spring maintainance block System, Intermediate Gray piston is provided with by interference fit on the third level stepped inner walls started counting up from check valve oil-out of valve pocket The piston seat of seat bellmouth, the oil inlet end face of piston seat and the pipeline oil-out end face of pressure duct are reserved with gap, tubular Baffle by being interference fitted on the second level stepped inner walls of valve pocket, and in spring maintainance block and piston seat it Between；The one-way piston for be provided with piston seat and baffle and be shaped as taper, being used cooperatively with piston seat bellmouth, one-way piston Oil inlet end facing to the pipeline oil-out of pressure duct, be communicated with high pressure in the centre of the oil inlet end face of one-way piston The pipeline oil-out of pipeline and the damping hole of check valve oil-out, oil-out end face and the spring of one-way piston are in close contact.

Damping hole is shaped as the taper that oil inlet side is big, oil-out side is small.

The check valve oil-out of check valve outer wall and steering gear steering gear oil inlet inwall between be provided with it is close Envelope effect steering gear O-ring, the check valve oil inlet of check valve inwall and pressure duct pipeline oil-out outer wall Between be provided with the pressure duct O-ring that seals.

The utility model is made up of hydraulic steering gear, check valve and pressure duct, and steering gear, check valve and pressure duct lead to Cross screw thread, steering gear O-ring and pressure duct O-ring and realize that the connection between three is fastened and sealed；The utility model is in list A spring is provided with into the valve pocket of valve, the spring is realized by spring maintainance block and kept and the approximately axial peace of unidirectional valve body Dress relation, the initial contact of one-way piston and piston seat is kept by spring, taper is provided with the center of one-way piston Damping hole, the very little of the pre compressed magnitude setting of spring is to reduce the resistance that fluid normally circulates.When vehicle runs well, liquid is turned to From fluid reservoir through low pressure line to power steering pump, realize that low pressure turns to liquid and turns to turning for liquid to high pressure by power steering pump Change, high pressure turns to liquid and is conveyed to steering gear offer power-assisted through the check valve with damping hole by pressure duct again；Now turn in high pressure To under the pressure effect of liquid, one-way piston moves the pressure of balancing spring to oil-out direction, so as to one-way piston and piston Seat separation realizes that diverted flow leads to, and removes the fluid for flowing to steering gear hydraulic cylinder, remaining is back to fluid reservoir by the road, such as This is reciprocal.When due to road or other situations cause the change of hydraulic system internal pressure acutely to cause to turn to liquid reverse flow when, One-way piston acts the backflow rapidly with piston seat contact cut liquid, so as to realize one-way flow, suppresses hydraulic pressure system The pressure oscillation of system.

Therefore, the utility model, which has, can effectively suppress the pressure oscillation of hydraulic system, improve pressure in hydraulic circuit Fluctuation bring the impact of steering wheel, the manipulation quality for lifting vehicle, it is simple in construction, easy to process, have with the matching of steering gear The advantages of universality, cost are low, wide market, compact-sized, good reliability.

Brief description of the drawings

Fig. 1 is schematic cross-sectional view of the present utility model；

Fig. 2 is the appearance schematic diagram of check valve and pressure duct.

Embodiment

With reference to embodiment and compare accompanying drawing the utility model is described in further detail.

A kind of hydraulic steering gear with damping hole check valve, including steering gear 1 and pressure duct 3, in the pipe of pressure duct 3 The outer wall of pipeline oil-out 18 of road body 11 is provided with externally threaded hollow bolt 10, is set between steering gear 1 and pressure duct 3 There is check valve 2, the straight-through valve pocket 16 in left and right is provided with the unidirectional valve body 9 of check valve 2, in unidirectional valve body 9 from unidirectional Valve oil-out 17 start several third level step outer walls be provided with the first order step of the steering gear oil inlet 13 of steering gear 1 The external screw thread of screw-internal thread fit on wall, it is provided with and pressure duct 3 on the inwall of the check valve oil inlet 19 of unidirectional valve body 9 Hollow bolt 10 on the internal thread that coordinates of external screw thread, the check valve oil-out 17 of check valve 2 is external in steering by screw thread At the steering gear oil inlet 13 of device 1, the pipeline that the check valve oil inlet 19 of check valve 2 is inscribed in pressure duct 3 by screw thread goes out At hydraulic fluid port 18 so that steering gear 1 and pressure duct 3 are linked together by check valve 2；Outer wall, the inwall of unidirectional valve body 9 are equal To be step-like, it is provided with the second level stepped inner walls started counting up from check valve oil-out 17 of valve pocket 16 by interference fit The spring maintainance block 4 of tubular, a precompressed spring 15, pact of the spring 15 in spring maintainance block 4 are provided with spring maintainance block 4 Kept under beam with unidirectional 9 approximately axial installation relation of valve body, in being started counting up from check valve oil-out 17 for valve pocket 16 By being interference fitted the piston seat 7 provided with Intermediate Gray piston seat bellmouth 21, the oil inlet of piston seat 7 on third level stepped inner walls End face and the end face of pipeline oil-out 18 of pressure duct 3 are reserved with gap, and the baffle 5 of tubular is arranged on valve by interference fit On the second level stepped inner walls started counting up from check valve oil-out 17 of chamber 16, and in spring maintainance block 4 and piston seat 7 it Between；The one-way piston 6 for be provided with piston seat 7 and baffle 5 and be shaped as taper, being used cooperatively with piston seat bellmouth 21, it is single To piston 6 oil inlet end facing to pressure duct 3 pipeline oil-out 18, in the centre of the oil inlet end face of one-way piston 6 It is communicated with the pipeline oil-out 18 of pressure duct 3 and the damping hole 12 of check valve oil-out 17, the oil-out end of one-way piston 6 Face is in close contact with spring 15.

Damping hole 12 is shaped as the taper that oil inlet side is big, oil-out side is small.

The check valve oil-out 17 of check valve 2 outer wall and steering gear 1 steering gear oil inlet 13 inwall between set There is the steering gear O-ring 14 to seal, in the pipeline of the inwall and pressure duct 3 of the check valve oil inlet 19 of check valve 2 The pressure duct O-ring 8 to seal is provided between the outer wall of oil-out 18.

Operation principle：

1st, original state, spring 15 keep coaxial position approximate with unidirectional valve body 9 under the constraint of spring maintainance block 4 Relation, baffle 5 be arranged on be interference fitted between spring maintainance block 4 and piston seat 7 with unidirectional valve body 9, piston seat 7 equally with Unidirectional valve body 9 is interference fitted.Spring 15 is rear in unidirectional valve body 9 is assembled to keep its pre-compressed state, ensures one-way piston 6 Coordinate with the initial contact of piston seat 7, when hydraulic work system, hydraulic oil is by pressure duct 3 by with damping hole 12 Check valve 2 is delivered at steering gear oil inlet 13, and with the continuous rise of hydraulic pressure, one-way piston 6 is by the pretension of balancing spring 15 Power separates with piston seat 7 and realizes one-way conduction, and now baffle 5 can realize that the effect that fluid is oriented to reduces system back pressure.

2nd, when larger pressure oscillation occurs in hydraulic system, pressure duct 3 is through the check valve 2 with damping hole 12 to steering The liquid flow direction of device oil inlet 13 will change, and turn to liquid and occur flowing back by steering gear oil inlet 13 through the list with damping hole 12 Situation to valve 2 to pressure duct 3, now the end face of one-way piston 6 will prolong the axis of unidirectional valve body 9 in the presence of hydraulic pressure Direction movement contacts with piston seat 7 again, blocks liquid backflow, while damping hole 12 makes the change of pressure relatively flat in the presence of one Slow transition, so as to reduce the trailer reversing safety issue that hydraulic shock is brought, improve the handling quality of vehicle.

Claims (3)

1. a kind of hydraulic steering gear with damping hole check valve, including steering gear and pressure duct, in the pipeline of pressure duct The pipeline oil-out outer wall of body is provided with externally threaded hollow bolt, it is characterised in that：Between steering gear and pressure duct Provided with check valve, the straight-through valve pocket in left and right is provided with the unidirectional valve body of check valve, in going out from check valve for unidirectional valve body Hydraulic fluid port start several third level step outer walls be provided with the first order stepped inner walls of the steering gear oil inlet of steering gear in The external screw thread that screw thread coordinates, it is provided with the inwall of the check valve oil inlet of unidirectional valve body on the hollow bolt with pressure duct The internal thread that coordinates of external screw thread, the check valve oil-out of check valve is external in the steering gear oil inlet of steering gear by screw thread Place, the check valve oil inlet of check valve are inscribed at the pipeline oil-out of pressure duct by screw thread so that steering gear and high pressure Pipeline is linked together by check valve；Outer wall, the inwall of unidirectional valve body be it is step-like, it is fuel-displaced from check valve in valve pocket By being interference fitted the spring maintainance block provided with tubular on the second level stepped inner walls that mouth starts counting up, in spring maintainance block inner chamber Provided with a precompressed spring, spring keeps closing with the approximately axial installation of unidirectional valve body under the constraint of spring maintainance block System, Intermediate Gray piston is provided with by interference fit on the third level stepped inner walls started counting up from check valve oil-out of valve pocket The piston seat of seat bellmouth, the oil inlet end face of piston seat and the pipeline oil-out end face of pressure duct are reserved with gap, tubular Baffle by being interference fitted on the second level stepped inner walls of valve pocket, and in spring maintainance block and piston seat it Between；The one-way piston for be provided with piston seat and baffle and be shaped as taper, being used cooperatively with piston seat bellmouth, one-way piston Oil inlet end facing to the pipeline oil-out of pressure duct, be communicated with high pressure in the centre of the oil inlet end face of one-way piston The pipeline oil-out of pipeline and the damping hole of check valve oil-out, oil-out end face and the spring of one-way piston are in close contact.

2. the hydraulic steering gear according to claim 1 with damping hole check valve, it is characterised in that：The shape of damping hole For the taper that oil inlet side is big, oil-out side is small.

3. the hydraulic steering gear according to claim 1 with damping hole check valve, it is characterised in that：In the list of check valve The steering gear O-ring to seal is provided between the inwall of the steering gear oil inlet of outer wall and steering gear to valve oil-out, The check valve oil inlet of check valve inwall and pressure duct pipeline oil-out outer wall between be provided with and seal Pressure duct O-ring.