CN2043956U - Equivalent steering strengthener - Google Patents

Abstract

The utility model discloses an equivalent steering strengthener for automobiles. A differential connecting oil line which is composed of a distributing valve and an oil cylinder is adopted (the diameter of a piston rod of the oil cylinder must equal to 0.7 time of the diameter of a piston). When the oil line drives the piston to move towards the side of a rod cavity, oil can be fed from both sides simultaneously; when the piston is moved towards the side of a rod-free cavity, the oil can be fed from the side of the rod cavity, and the oil can be returned from the side of the rod-free cavity; simultaneously, the oil hydraulic pressure and the speed are equal when the piston is moved towards both sides, that is, the left steering and the right steering of an automobile are equivalent. The equivalent steering strengthener can be widely used in power steering systems of heavy automobiles and motor buses.

Description

Equivalent steering strengthener

The utility model is a kind of hydraulic steering booster that is used for HD truck and motorcoach.

Existing hydraulic steering booster all adopts the single-piston rod oil cylinder, there are the following problems for it: (1) is if steered wheel turns over the identical steering resisting torque that angle ran into to the left or to the right when equating, then unequal at the pressure that the chamber, front and back of oil cylinder produces, this pressure that does not wait is reacted to by steering gear and just shows as right-hand turning on the bearing circle than left-handed turning effort (car that has then is that left-handed turning is required great effort than right-hand turning), make " hand-power " of chaufeur feel different, promptly so-called " road feel " difference.(2) if bearing circle is turned over identical angle to the left or to the right with unequal angular velocity, this moment is because system is identical by the flow that distributing valve enters the oil cylinder both sides, and the payload space of oil cylinder piston both sides does not wait, so that the speed that piston moves to the left or to the right just do not wait, be reacted to and then show as left-handed turning on the wheel flutter and the right-hand turning cireular frequency is different, thereby turning efficiency is also different.Because the problems referred to above often make the handling maneuver error or are difficult to handle exactly automobile and turn to by the route of expecting.

The purpose of this utility model, will overcome the problems referred to above exactly provides a kind of " motor turning equivalence assistor ", promptly left be to the right equivalent, make the performance of the motor turning assistor of China more attain perfect.

Differential oil line of the present utility model is by oil pump (3), 3-position 4-way distributing valve (18), oil pipe (4) and oil cylinder (15) are formed, oil cylinder (15) is by piston rod (12) (diameter of piston rod of differential oil line be necessary for diameter of piston be 0.7 times be that effective working area of rod chamber piston is half of the effective working area of rodless cavity piston), piston (13) is formed, the distributing valve of differential oil line (18) desires to make piston (13) when rodless cavity moves, then from the rod chamber one side oil-feed of oil cylinder (15), rodless cavity one side oil return.Desire to make piston (13) when rod chamber one lateral movement, then make oil input channel to the oil-feed simultaneously of oil cylinder (15) both sides, simultaneously back oil road and oil cylinder (15) both sides oil duct are cut off, at this moment oil cylinder two chamber operation pressures equate, but because piston (13) rodless cavity area is greater than the effective working area of rod chamber, so the thrust that the thrust that piston (13) rodless cavity produces produces greater than rod chamber, thereby piston (13) will be promoted to move to rod chamber by fluid.At this moment, the fluid that cylinder rod chamber flows out also flows to rodless cavity, and the oil that enters with oil input channel promotes piston (13) simultaneously and moves to rod chamber.Above-mentioned distributing valve (18) makes piston (13) move to rodless cavity or to rod chamber and main makes steering screw (6) drive guiding valve by steering dish (7) to move right or be moved to the left and realize with the channel position that changes guiding valve.After loosening bearing circle, guiding valve is got back to midway location under centering spring (14) effect.At this moment, oil-feed, back oil road and oil cylinder two chambeies all communicate.

Characteristics of the present utility model are oil liquid pressure P that piston (13) is moved to rodless cavity _RightThe oil liquid pressure P that piston (13) is moved to rod chamber _{A left side}Can draw from following proof: establishing piston (13) diameter is D, and the ≈ 0.7D of piston rod (12) diameter d=(D)/2 is if oil cylinder (15) oil inlet quantity is Q, so

$P_{}＝\frac{F}{\frac{{\mathrm{\pi D}}^2}{4}-\frac{{\mathrm{\pi D}}^2}{4}}=\frac{\mathrm{4F}}{\mathrm{\pi \; 〔(}\sqrt{2}{\mathrm{d)}}^2{\mathrm{-d}}^2〕}=\frac{\mathrm{4F}}{{\mathrm{\pi d}}^2},$

$P_{}=\frac{F}{\frac{{\mathrm{\pi D}}^2}{4}-\frac{{\mathrm{\pi D}}^2{\mathrm{-nd}}^2}{4}}=\frac{\mathrm{4F}}{{\mathrm{\pi d}}^2},$

When the resistance F on the piston rod (12) equates, (turn to identical moment conversion to obtain) P is then arranged by left and right _{A left side}=P _Right

Another characteristics of the present utility model are speed V that the pressure oil when entering oil cylinder (15) rod chamber makes piston (13) move to rodless cavity _RightThe speed V that pressure oil in the time of should equaling to enter rod chamber and rodless cavity simultaneously makes piston (13) move to rod chamber _{A left side}Can draw from following proof:

$V_{}=\frac{Q}{\frac{\pi }{4}{\mathrm{(D}}^2{\mathrm{-d}}^2)}=\frac{\mathrm{4Q}}{\mathrm{\pi \; 〔(}\sqrt{2}{\mathrm{d)}}^2{\mathrm{-d}}^2〕}=\frac{\mathrm{4Q}}{{\mathrm{\pi d}}^2}$

$V_{}＝\frac{\mathrm{Q+Q\; \prime }}{\frac{{\mathrm{\pi D}}^2}{4}}=\frac{\mathrm{Q+}\frac{\pi }{4}{\mathrm{(D}}^2{\mathrm{-d}}^2{\mathrm{)V}}_{}}{\frac{{\mathrm{\pi D}}^2}{4}}$

The oil mass that Q ' in the formula--rod chamber is discharged gets V after the following formula transposition arrangement _{A left side}=(4Q)/(π d ²), when the flow Q of equivalent hydraulic steering booster one timing, V is arranged then _{A left side}=V _Right

Advantage of the present utility model: compact conformation, performance is more perfect, thereby has overcome two problems of above-mentioned existence.

Description of drawings:

Fig. 1 is a differential oil line schematic diagram of the present utility model.

Fig. 2 is equivalent hydraulic steering booster scheme drawing.

With reference to Fig. 2, the utility model is made up of the two large divisions:

1. Hydraulic Elements part: fuel tank (1) is arranged, fluid valve (2), oil pump (3), oil pipe (4), oil cylinder (15), distributing valve (18).Wherein oil cylinder (15) comprises piston rod (12), and piston (13), distributing valve (18) comprise back counteraction plunger (10), guiding valve (11), centering spring (14), preceding counteraction plunger (16), thrust bearing (17).

2. actuating element: steering nut (5) is arranged, steering screw (6), bearing circle (7), longitudinal tie (8), spindle arm (9).

Among Fig. 2, parts action and fluid flow direction when solid arrow is represented to handle the automobile left-handed turning, parts action and fluid flow direction when dotted arrow is represented to handle the automobile right-hand turning.

Parts that the utility model adopted and Hydraulic Elements are gauge member, as long as do slightly to change according to the size of vehicle type structure size, do not have special apparatus and process and technical requirements, the enforcement of all can going into operation rapidly of the producer of existing production power steering.

Claims (1)

1, a kind of equivalent hydraulic steering booster of the large-scale autotruck of forming by fuel tank (1), fluid valve (2), oil pump (3), steering screw (6), bearing circle (7), longitudinal tie (8), distributing valve (18), oil cylinder (15), it is characterized in that: form a differential oil circuit that is connected by distributing valve (18) and oil cylinder (15), the diameter of the piston rod (12) of the oil cylinder of this oil circuit (15) equals 0.7 times of diameter of piston (13).

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