JPS6085062A - Steering device for vehicles - Google Patents

Abstract

PURPOSE:To make good turning capacity attainable according to a car speed or a road surface condition, by making a deviating angle to steerage in a steering wheel or rear wheels alterable. CONSTITUTION:A control circuit 42 controls a flow rate of a pressure fluid to be fed to a control valve 45 from a pump 39 according to a car speed so as to cause the flow rate to be increased at a high speed zone. Therefore, even when steering force to be added to a steering wheel 19 is constant, that is, a variation in a flow passage area of each variable orifice of the control valve 45 is constant, a pressure differential inside pipes P7 and P8 by the control valve 45 grows large at the high speed zone whereby actuators 46a-46d deform each of insulator rubber parts 23R and 23L with yet larger force. With this constitution, rear wheels 13R and 13L are deviated yet larger at the high speed zone so that a large slip angle is set there, thus turning in a car is well stabilized.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a steering system for a vehicle, and more particularly, to a vehicle steering system in which both +'+i+ wheels and rear wheels can be steered. The present invention relates to a steering system capable of controlling a multi-wheel deflection angle of 11.1 knots.

(Prior art) In recent vehicles, both the front wheels, L and rear wheels t%' and 71e are i'J with the aim of achieving N1 performance.
('+Iev steering gear; Takumi proposed this +l'j
O, l +:, ij rudder device and (-2(, for example,
- hC, 1, (21 impressions, l
I-' control fall devices are known.

This compliance steering control wave fj is generated by the elastic body C interposed between the rear wheel pressure and the suspension device and the vehicle body.
Goura j1-operation stage is fitted and 7 the hydraulic actuating means is supplied with hydraulic pressure for the power 7 linter of the link machine. : I Encira “Reduced unsteering by 4
J: Add control to Li'>MonoCai].

In other words, the rear wheels are steered by increasing or decreasing the steering wheel.

j-like':Imbra-(-7':/ Susti j
' 1lill 1all device has a forced slip angle (slip angle) that corresponds to the steering of the rear axle -\steering handle when turning - Q, two-stage setting? :
, Alone I'', II-Nallink Force Living Ul
, 1. Provides stable turning performance.・1-
Rope l no, this, L) na 1 compliance 7 no, j-'
-j' control device: 1. The distance that acts on the car body as a
A high-speed run with great force t1 A run that goes down to the ribs fi (!l
1” target e, 11! I speed turning 11■, 4t C rear wheel 17Ii -J...Rio) IU, -
・To prevent this from happening.・rl.

But long c:,1,this,1,)ノ111ng-+
(-i' In the case of a 7-speed steering control device, [the deflection angle of the rear wheels relative to the steering of the steering wheel (this length Jfii example ζ
In this case, the deflection angle per unit steering force (deg/kg
Since the characteristics are uniquely determined, the characteristics are controlled according to the vehicle driving condition 71. There was a problem in that it was difficult to obtain a smooth turning motion. In order to achieve better turning performance (;I), it is necessary to use the steering handle at medium speed or depending on the road surface conditions, etc.
Controlling the corners is a must! There has been a demand for the development of a means for controlling the deflection angle of the rear wheels relative to the steering of the wheel in the FI direction.

(Object of the invention) This invention consists of: 1. This article was made to reflect the circumstances of the article. , Il ("I will provide the V1 rudder system")
il f! 4 stomachs'? 1. That is the 11th thing.

(Structure of the Invention) The steering device of the present invention includes a front wheel steering means for deflecting one wheel so that the applied steering force reaches 1,000 yen, and the steering handle by the action of pressure fluid. a rear wheel steering means for deflecting the rear wheels in response to the steering of the pump; a pressure fluid generation section for pressurizing the working fluid in the reliever to generate pressure fluid; 1 to the rear wheel steering means (flow m py + ll adjustment, f, crotch, which can change the deflection angle of the rear wheels aligned to the steering of the steering handle by changing the diversion of the supplied pressure fluid; It is white and ζ.

In the vehicle steering system of the present invention; 6", the flow rate characteristic of the pressure fluid supplied to the rear wheel steering device when the steering wheel is steered is controlled by the control means such as the flow control valve. It is possible to perform automatic control by manual operation or by using the flow height adjusting means of 1.
rro. For this reason, its dry rudder special interest should be set to Φl;
By setting T, rudder 1t, and li characteristics to IIh characteristics depending on medium speed, etc., good turning performance can be achieved at t7i.

(Example) Below, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing a first embodiment of the present invention, and a small outline of a vehicle steering system.

First, to explain the configuration, +1 is the car body, +212.12
L is the front wheel, 13g, 13L is the rear wheel.

1iii rings 12p and 12L are each 4゛1. Knuckle J・14R, I4L and Zytroso
It is connected to the end of the rack 16 via 15R and I5L. A pinion 17 meshes with the U-tsuk 16, and the pinion I7 is connected to a steering wheel 19 via a steering wheel shaft 18. This rack Ifi #'
, r = l and the pinion 17 is the steering gear mechanism 20
Configure.

The rear wheels 13q and 13L are each supported in a swingable manner by the semi-link arm 21R12'k. Both of them are supported elastically to the vehicle +1 by U7 pins 24 and 24ξ, and
25 is shown in the diagram 2
It is fixed by no bolts. This differential gear housing device also includes: an insulator rubber 2fi, which is elastically supported by a pin 21 to the middle tree 11; In addition, 28ρ and 21 are the drive shafts that connect the differential gear in the gear housing 25 and the rear wheel 132.13L during differential arrangement. ◇ 29 applies the working fluid in the reservoir 30 and discharges it. The first pump, 31, is provided with a stay 1 ring, and the first pump (IQ and arrangement qv・p, connected through ξ, ゛C, and G, Nirisha 2'l and arrangement 21), Shift and connect the 7 valves to the first control valve, and the first control valve
They are connected to the power cylinders 32-, . The first control valve 31 controls the steering wheel angle (in the embodiment, the steering wheel angle - 1 is applied and the flow 1??δ?''(changes 4) depending on the applied steering force). IIJ modified orifice: (I a , 3+ 1) 1.il t: ,
, il d is set to 1, and the first pump 2 () discharges -4 to 1 (-), controlling the steering wheel in a circular manner to control the power fluid to the ′ζ power cylinder 32. .

The power cylinder 32 is a Solin Tahoe unit 34 with a piston 33 fixed to the rank 16 and attached to the vehicle body 11.
Two fluid chambers; 35.3 (j
is defined. This power cylinder (2 is a fluid chamber supplied with pressure fluid from the first control valve 31; 3536) generates a steering assist force corresponding to the pressure difference, and presses the rack 16 in the steering direction U. These first pumps 29,
The reservoir 30, the first control valve 3I and the bar cylinder 32 constitute a well-known bar steering device 37. Also, this 7 Maso Sufuno'' ring device 3
7 constitutes a front wheel steering means 38 together with the aforementioned steering gear mechanism 20.

Reference numeral 39 denotes a second pump (pressure fluid generator L means) for pressurizing and discharging the working fluid in the reservoir 40;
9 is provided with a flow If1 control valve 41 for changing the discharge 1■ of the pump 3''.

For example, the flow control mechanism 4
It is constructed from the flow rate controller disclosed in the above publication and is connected to the control circuit 42.

This control circuit 42 is connected to a vehicle speed sensor 4 that detects the vehicle speed V.
3 is connected, vehicle speed/I! The flow rate control valve 41 is controlled based on the output of the engine ν-4:3, and the second pump 320
>The discharge amount is set to, for example, a first characteristic (as shown in the figure).The flow M control valve 41 and the control circuit 42 constitute a flow rate adjusting means 44.

The flow rate control valve 41 is connected to a second control valve 45 via a valve. Second control valve 45, and piping ■]. and a pair of piping 1)
・Rear wheel 9′ Spenno・3 Nmenha 2 via 1-Pl+
Actuators 46a, 46b, 4()C14Ei (1") interposed between 2 and the vehicle body 11
5. This second control valve 45 is also connected to the first control valve tll.
l+valve 3! Similarly, + supplied from the flow control valve 41
E-force fluid steering handle! 10) ar control system according to the steering (actuator 46 a, 4[i 1+
, 4(it: ,, 4(i (1-″・Supply.Active, eta 4fi fI , 4(i 11.4
(i (:, 4) (i tl is the month that is connected to the vehicle body 11 and the rear wheel suspension system 22 by the binoyoi>no 1 and is supplied.

Insulator rubber 23R123 due to force fluid action
Modify the L and change the rear wheel ZASPENSHIJINMENHA 22 to BIN 27
It rotates around the center. That is, the actuators 46a, 46b, 46 (1, 46rl & yo, I
E Force m By rotating the rear wheel 22 by the action of the body, the rear wheel +3q, 13L is biased. The above-mentioned second pump 39, control means 44, second control valve 45 and actuator 4 [ia, 46b, 46c
, 46d constitute a compliance steering control device (rear wheel steering means) 47.

Next, the effect will be explained.

The steering system of this vehicle is the front wheel 12R of r, li jbj.
112L and the rear wheels 13q, 13L are biased according to the direction of the ship, 19, etc.) i source chi? The ring device 37 generates a steering assist force to perform steering]
Front wheels +2q, 12L (11) t and rudder are adjusted by ljl + %7, -1 appliance steering control device , 13a are biased in the same direction as 1j; one wheel 12g and 12L. Sori, C,...:Iinso'rai-
j' in the steering control device 47, -)'r:l, 1.
1 Rear wheel 1 for steering of Kuwa direction λ torque 19; 3R11
3Lσ] The deflection angle is controlled according to the vehicle speed.

Now, if the steering wheel circle is not steered by 1, the first
The control valve 31 has two orifices 31a and 31b.
, 31C131d change the opening degrees of :
, 31d to the reservoir 30. Therefore, the power cylinder 32 does not generate any steering assist force, and the vehicle moves straight. Similarly, the pressure fluid discharged by the second pump 39 flows back to the reservoir 40 through the second control valve 45, so that the rear wheels 13p and +3L do not exhibit any deviation, and the straightness of the vehicle is reduced to 1. I'm stunned.

Next, when a steering force is applied to the steering handle 19 and the steering wheel 19 is steered, for example, to the right (the same applies in the explanation of 1), the first control valve 31 is i+J odd audio rectification 3, :il (When I is opened, the text becomes ii J odd audio rectification 31111 (: is opened,
There is a difference of 1 to 41 in the 11 force fluid flowing out in each distribution +', , p', . In this case, the first control valve; (1 is
In order to supply the pressure fluid of the power cylinder 32's single-force fluid chamber 3 [i'' 1llll lI- through the 1 port), the Bamano Frinz 32 generates a steering assist force and presses the rack 1G. .L7 Therefore, front wheel +2q, +2
L is biased by the steering force transmitted from the steering wheel 10 via the steering gear mechanism 20 and the steering assist force generated by the power cylinder 32.

Similarly, when the steering handle 19 is steered, the second control valve 45 opens the variable orifices 45a, 45d, and opens the variable orifices 45b, 45(). 1. A pressure difference occurs in the pressure fluid flowing out into R8, and pressure fluid of L-+ni pressure is supplied to the actuators 46b and 46C via the pipe P8.For this reason, the actuators 46b and 46C are supplied with pressure fluid of L-+ni pressure. 46c, 4
6d is the rear wheel rear rubber 23Q, 23i which is modified to create a rear wheel suspension 22.
°a 1 direction G rotation - Q, 1 & wheel 1. irl, 13L
to the right in the same direction as 11; 1 wheel 12Q - 12L.

Here, the pressure fluid discharged from the second pump 39 is controlled by the flow control 4r-41 and has a flow M characteristic as shown in FIG. , control circuit 42
The flow ljl of the pressure fluid supplied from the second bonzo 39 to the second '+11 control valve 45 is controlled in accordance with the 11F speed so as to increase in the +rb speed range. For this reason, t'A direction Han 1° l! 11. The steering force is constant, and each of the second control valves A5 has a constant steering force.
? 8 In the case where the change in area is constant, °ζ is also the 2111th
11 The pressure difference in the piping P7.1) il due to the control valve 45 is i
It becomes large in the f1 speed range, and the actuator 46a
, 46b, 46C146d are inu with greater force/,
5. L. Taraha'l: (R123L forms 'A.-')"-K Wa'!:l, 21st li111i11
1 yt' 45 utilizes well-known orifice characteristics, so when the flow rate of the pressure fluid supplied to the second control intermediary 45 increases, the ac-knee 1 eta 4ti l)
, 4(j
i c, 4 fi d is a powerful force in 7. To make the roller rubbers 23ρ and 23t- more user-friendly.

However, the rear wheels +3R1+37- are more deviated than in the 10th gear and the 2nd gear, and a large side slip angle is set, thereby stabilizing the turning of the vehicle.

Note that the flow rate characteristics of the pressure fluid supplied to the second control valve 45 are not dependent on the characteristic fI shown in FIG. As shown in FIG. 9, it is also possible to increase the flow rate by 10 to 15+11 in stages at high vehicle speeds.

FIG. 2 shows a second embodiment of the invention.

In this second embodiment, the flow rate characteristics of the pressure fluid supplied to the second control valve 45 can be changed manually. Note that the same parts as in the first embodiment described above are designated by the same numbers as E1, and their explanations will be omitted.

As shown in the figure, the control circuit 42 is connected to, for example, an operation switch 4) 3 that can be manually operated continuously. This control circuit 42 controls the flow m control block i'41 according to the operating position of the e operation switch 48.
41. is supplied to the control valve 45. For example, the flow rate of the E-force fluid is not shown in FIG. 10;

In this second embodiment, by operating 1ffl ml 7 48, the change characteristic of the deflection angle of the rear wheels +3q and +3L with respect to the steering of the steering wheel 19 can be set to a desired characteristic. Therefore, it is convenient to set the steering characteristics of the vehicle to the characteristics desired by the driver.

FIG. 3 shows a second embodiment of the present invention.

In this third embodiment, the deflection angle of the rear wheels 13R113L relative to the steering of the steering wheel 19 is controlled according to the vehicle speed, and the deflection angle 1. The rate of change of the η angle with respect to 11 work speeds can be adjusted manually. Note that the same numbers are used for the same parts as in the first and second embodiments described above, and the explanation thereof will be omitted.

In this third embodiment, the flow 1ij of the second control J "45--supplied j" force fluid is controlled, for example, with the characteristics shown in FIG. 11. In other words, the second control valve 45
−1 Monthly fluid flow 1ij supplied by 11 (speed sensor °
Based on 43' (predetermined medium speed V t+ 1 dato low tonne speed range (predetermined ratio i x (vehicle speed and 6.2 gradual increase'
Control and increase - I! It is assumed that manual operation 11J is performed by C operation 48 between the solid line and the broken line in the figure. Therefore, the rear wheel for the steering of the handle 19! The deflection angles 3R and 13L have characteristics substantially similar to those shown in FIG. 11, and the turning movement of the vehicle is stabilized, and desired steering characteristics can be obtained.

FIG. 4 shows a fourth embodiment of the invention.

This fourth embodiment is configured such that the second pump 39 is driven by a motor 49, and the motor 49 is controlled by a control circuit 42 based on manual operation of an operation switch 48.

In this fourth embodiment, the rotation speed of the motor 49 is controlled according to the operation of the operation switch 48, and the rotation speed of the motor 49 is controlled according to the operation of the operation switch 48.
The flow rate of the pressure fluid supplied to 5 is set to the characteristics shown in FIG.

However, the characteristics can be set depending on the steering device. These motors 4C) and control circuit 4
2 is the flow rate! i! ! - There are 7C, comprising 44 confirmed in January. Note that the other configurations and functions are as described above.
Is it the same as the example and the explanation is omitted? ).

FIG. 5 shows a fifth embodiment of the invention.

In this fifth embodiment, the second pump 39 discharges '', r, .
l Return the IE force fluid to 9-40 (
, controls the flow M of pressure fluid supplied to the second control valve 45. It should be noted that the same numbers as in the first embodiment and the same numbers as in the first embodiment will be omitted.

As shown in the figure, this steering device has a second control valve 45
A bypass pipe 1) 9 is connected between the inlet L/soto side pipe 1) and the train side pipe 1) 6, and the control circuit 42 is connected to the bypass pipe 1]. Some models are equipped with a +li compensation type flow control valve 50. The control circuit 42 is connected to a vehicle speed sender 43 and drives a flow control valve 50 in accordance with the vehicle speed. These bypass-1\1) 5, flow rate control valve 50, and control circuit 42 constitute a flow rate adjustment means 44.

In this fifth embodiment, the second control valve 4 is controlled so as to reduce the flow rate of the hydraulic fluid flowing through the bypass pipe P at high vehicle speeds.
5--Set the flow m characteristics of the supplied pressure fluid to the characteristics shown in FIG. Therefore, the driving stability of the vehicle improves.

FIG. 6 shows a sixth embodiment of the present invention.
In the embodiment, the flow rate of the pressure fluid flowing back to the reservoir 40 via the bypass 1 (1° I) is adjusted by manually operating an operation switch 48 connected to a control circuit 42.

Note that the same part 5 (
6True;L Same number is (;J) and its explanation will be omitted.

According to this sixth embodiment, as in the second embodiment described above, by setting the operation switch 48 to 1M, the flow rate of the pressure fluid supplied to the second control valve 45-1 is adjusted as shown in FIG. It is possible to set the characteristics as shown. Therefore, the steering characteristic of the vehicle can be set to the characteristic desired by the driver U.

FIG. 7 shows a seventh embodiment of the invention.

In this seventh embodiment, the deflection angles of the rear wheels +3Q and +3L that appear when the steering wheel 19 is steered, as well as the rear wheels 13 stages and 13 stages.
The deflection direction of L can be changed.

Note that the same parts as in the sixth embodiment are designated by the same numbers, and their explanations will be omitted.

As shown in the figure, the second control 41'4! 'i and acti 1
, eta 4 (ia, 46b, 46c, 4fi d are connected to the piping P), l'H is the drive J same 1? δ51
A directional control valve 52 connected to the second directional control valve 52 is interposed.
f'45 side arrangement 11', and actuator 4 (i
(k) Piping P on the representative 'Jru) side with a number without I. and the second control valve 45 I.
The first pipe 1 + 1 1 connects the pipe pR of II and the pipe 1) 8 on the AC-3-:L-7-ri 4() side, and the second control - (piping l with i≧451 μm), , , 1) 8 and actuator tie [) Example arrangement @l) , , , P 11
and a second switching position 11 which respectively interrupts 1υ13"
:X goben 4',)l! 1 arrangement + IT, p.
'I'l+ and -rri-3-1, I-E4[) Example piping 1'' are connected to Ja) 3rd switching position W+u.This directional valve 52 is , Drive circuit 1?851 installed 1゛, motion su・ino I' 5: (ni, 1, su I?v
i It is set - CI switching position! ).

In this seventh embodiment, if 1, as in the sixth embodiment described in 1111, the steering wheel IC) has a steering wheel that is phantom.
It is possible to set the 1 angle of 3R1 + 3L to the desired value.
At iJ Noh, 6.云 MESUMI・INOSEN53、l A
By operating the t-direction switching valve 52, the rear wheel +30, 13
The direction of the biased portion of L can be changed arbitrarily. Therefore, for example, at high vehicle speeds, the rear wheels 13Q and Ik are biased in the same direction as the front wheels 12q and 12L, and at low vehicle speeds, the rear wheels 13R and 113L are biased in the same direction as the front wheels 12q and 12L.
R112L and bias in the opposite direction -U, it is possible to obtain good vehicle turning characteristics.

(Effects of the Invention) As explained above, according to the present invention, the deflection angle of the steering G and the steering wheel of the rear wheel groove direction handle is changed i'
Since there is J fil F, it is possible to set the steering characteristics of the vehicle to the characteristics desired by the driver's cab. In addition, by controlling the deflection angle relative to the steering of the falling steering wheel according to the speed AZ) or the road surface condition, it is possible to obtain excellent 11-time performance.

[Brief explanation of drawings]

Fig. 1 to Fig. 7 4, Invention G by L, - Kakaro vehicle o>
Figure 1 shows an example of the rudder device.
Fig. 2 shows the second embodiment, Fig. 3 shows the third embodiment, Fig. 4 shows the fourth embodiment, Fig. 5 shows the fifth embodiment, and Figs. C) Example, FIG. 7 shows the seventh example. Figures 8-C and 13 are neo-diagrams showing the mode of pressure fluid flow...control +7. 12, +2 Front wheel, 13 ・13 Rear wheel, +9--1 Eiko handle 1, 38 Front wheel steering 1' 1st stage, 39 2nd pump (1" Mocha fluid destination stage), 43 -
44 Flow rate adjustment means, 47 τl pressure stage control device (i
& wheel steering - mouth to mouth), 481 Eisaku switch. Patent Applicant 1-1 Sans Automotive 1J Hayashi Company Agent Buf Rido (IIQ Army Part Figure 1 Figure 2 11 Figure 3 1 Figure 4 1 Figure 5 1 Figure 6 11 Figure 7 1 Figure 8 Figure 9 R 101; 1 Figure 12 Figure 13 p1

Claims (1)

[Claims] +11 Fire-direction steering wheel...The applied steering force is transmitted to deflect the front wheels (11; I-wheel steering means and the action of pressure fluid deflect the rear wheels in response to the steering G of the steering wheel) Rear wheel steering means and IJ to the rear wheel steering means
A first stage of pressure fluid generation f for supplying power fluid; (Installing the flow rate adjustment f1 and J, and changing the deflection angle of the rear wheels with respect to the steering of the direction pan 1 wheel as described in 11.) ``J O@ 1jφ rudder gear for 11 yen cars;
The 1st stage of rear wheel steering deflects the rear wheels in the same direction as the front wheels.A)-r'C1iil The 4th stage of flow rate adjustment adjusts the flow rate adjustment 4th stage of I)11 to medium speed. G, 2 rows m
, 1-7 and more oil at high vehicle speeds than at low vehicle speeds.
1F force fIL is supplied to the rear wheel steering means, and the deflection angle of the rear wheels with respect to the steering of the steering wheel 1 is +i',
The θ door 1 described in claim (1), characterized in that the speed limit is controlled to be larger than that at low vehicle speeds.
One car steering system.