JPS60206777A - Car steering system - Google Patents

Abstract

PURPOSE:To reduce the stationary swing during stoppage and the steering power unde faint speed travel by providing an open/tandem/center/valve for switching the pressure oil flowing from a control valve to an auxiliary power cylinder. CONSTITUTION:A hydraulic pump 11 is driven through an engine mounted on a truck 67 to produce the oil pressure for driving main and auxiliary power cylinders 12, 13. Said pump 11 will produce the oil pressure for main and auxiliary power cylinder 12, 13 but the supply capacity of said pump 11 is set only on the basis of main power cylinder 12 such that the supply capacity of existing hydraulic pump will be set on the basis of the output from the power cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steering system used in a vehicle.

Koyama: For example, in the steering system that steers the trunk or the front wheel axle of a passenger car, the human power exerted by the driver is applied to the steering system, which is responsible for operating the steering wheel and the vehicle in front! There is a growing need to be able to steer I or I#l+ reliably and easily and to make safe turns without impairing the turning performance of the vehicle.

Furthermore, in recent years, not only traffic complications and parking problems [1,
Due to the demands of the operating sound side, the steering system has been designed to enable light and quick steering.
For this purpose, various types of power extraction equipment (1 equipment, 1
In other words, power steering has been proposed.

However, in this type of power steering, the force required for steering depends on the supply capacity of the hydraulic pump as the hydraulic pressure supply source for the power steering, and the pressure receiving area of the nohano piston as the output mechanism for the power steering. Therefore, the range of change in steering force is inevitably limited, and in particular, the ability to steer is limited, and as a result, it is difficult to steer when a medium-sized vehicle is stopped, and when steering at slow speed II, 1. It was essential to do this with an extremely small operating force and sufficiently reduce the fatigue caused by the toshito rudder in such cases.

In addition, the supply capacity of the hydraulic pump has been increased, and
If the hydraulic pump 0 and the power piston are made larger so as to increase the pressure receiving surface fL+1 of the guno piston, the above-mentioned UJ capacity can be increased, but with such a configuration, the hydraulic pressure The load on the ennon that drives the pump becomes extremely large, and even during high-speed driving, which does not require a large supply capacity from the hydraulic pump, a large load is applied to the ennon, and the fuel consumption rate is low. It was there.

It is an object of the present invention to at least perform steering when a vehicle is stopped and when running at a very low speed with an extremely small operating force, to sufficiently reduce fatigue caused by such steering, and to use a 411-pressure ponzo. This makes it possible to perform such steering without increasing the size or making the pressure-receiving area of the . The object of the present invention is to provide a steering system for use in a vehicle that improves the fuel consumption rate of the vehicle.

Taking these into account, the steering system used in the 1L vehicle of the present invention steers a hydraulic pump and a pair of front wheel axles connected to both ends of the front axle in a swinging manner.]
- A power cylinder and a pair of front and rear wheels dbl+ which are connected to both ends of the @iJ rear axle in a swinging manner of 11" so as to supplement the steering force of the main power cylinder, and one of its frontmost middle wheel axles. The auxiliary power is controlled by the steering gear and the steering gear according to the human power at the steering wheel, and the hydraulic pump supplies the
The flow of pressure 7111 supplied to the cylinder: 1), the control pulp that changes the 111j auxiliary power cylinder to be interlocked with its main power cylinder and its auxiliary power cylinder to be free; +71 including oats, tandem, center pulp, which switches the flow of pressure oil from its control pulp to its auxiliary manor silintani so as to make it in any of the states.
will be accomplished.

Hereinafter, a preferred example of a steering system used in a vehicle according to the present invention will be described with reference to FIG. 11ii.

1 and 2 show a specific example 1O of the steering system used in the vehicle of the present invention, which is applied to a front two-axle type truck 67.

This steering system fJf, 10 is the front two 1q[+
It steers the frontmost wheel axle 18 and the front and rear wheel axles 19 whose steering angles are changed in conjunction with each other in the type truck 67, and includes a hydraulic pump 11, a main power cylinder 12 that steers the frontmost middle wheel 111+18, and its main In order to supplement the steering force of the power cylinder 12, its front and rear wheels IIq1
An auxiliary guno cylinder 13 connected to the 119 side,
Depending on the steering force, the oil pressure is 1? a control sac valve 14 which changes the flow rate of pressure oil sent from the valve 11 to its main and auxiliary cylinders 12.13, its control valve 14 and its auxiliary power cylinder 1;
Left 1 no i and right turn hydraulic piping 63, 64 connecting with 3
An open door is installed at the
Due to the tandem center valve 15, the truck 67 stops] Old 1. When driving at slow speeds and running at slow speeds, the Nl
When the i-auxiliary and q-no cylinders 13 are linked to their main power cylinders 12, and when the truck 67 runs under conditions other than those mentioned above, the auxiliary power cylinders 1
+1)) so that the cylinder chambers 32 and 33 of 3 are in communication with each other, and its auxiliary power cylinder 13 is free.
v has been completed.

The hydraulic pump 11 is driven by an ennon (not shown) mounted on the truck 67, and is configured to generate hydraulic pressure for driving 1: and Nizansuke Power Schilling 12.13, which will be described later. There is. That oil +1 bond?
ring 11 has its main and auxiliary power shillings 12.
13, but just as the supply capacity of an existing hydraulic pump is set based on the output of the power/ring, the supply capacity of the pump 11 is based on its main
It is set based on the output of only 12 shillings.

Of course, the hydraulic pump 011 has substantially the same configuration as the existing hydraulic pump, so a description of its configuration will be omitted.

:1 The Kohawa cylinder 12 is a hydraulic cylinder, which includes a cylinder 20, a piston 21 fitted into the cylinder 20 so as to be able to reciprocate and slide, and one end of which is connected to the cylinder 2.
0, and the other end can be inserted into and taken out from one end of the piston 2.
1 and an operating rod 22 connected to the main body.

The main power sill 12 is rotatably connected with the other end of the sill 20 to the idle arm 34 on the frontmost wheel axle 18 side, and with the end of its operating rod 22 to the chassis 68 side of the trunk 67. .

The idle arm 34 is rotated in the longitudinal direction of the chassis 68 by the drive of the main power cylinder 12, with the upper end rotatably connected to the chassis 68 being the point f, and is attached to the frontmost wheel 1I41118. Change the steering angle of the wheels 69.

zu/I゛waji, the most 1) 1j Knuckle 16G with wheel axle 18, 1 section (of f]) 1'' 2: 1llll J, l
;Similar to the knuckle in the lid rack, it is formed in an abbreviated form (]11- with a knuckle arm 38 and a throat with a tap 39, and as such j,
The knuckles 16 formed with T and F are attached to both ends of the frontmost 111111 side beam (not shown). The - r'
The lower IW of the dollar arm 34 is connected to its knuckle arm 38 end via a drag link 36.

Of course, the ends of the tie rod arms 39 of the pair of knuckles 16 are connected to each other via a tie rod 45.

-) -0% Part 1'・ξNo The cylinder 12 is driven, and its idle arm 34 is
When the two knuckles 1.6 are rotated rearwardly, the pair of knuckles 1.6 rotate around the steering pin 42, and the most 1'JII wheel 1fi 18 is steered.

1qli Rib/Zono Schilling 13 i;L Soo Lord Hano Schilling 12 to supplement the steering, O'J
? It is connected to the X-ton wheel shaft 19 side, and is configured to be interlocked with the main power cylinder 12 by pressure oil sent from the hydraulic pump 11 via the control valve 14, which will be described later.

That is, the auxiliary power cylinder 13 is a hydraulic cylinder similar to the main power cylinder 12, and includes a cylinder 27, a stone 28 fitted in the cylinder 27 so as to be able to reciprocate, and one end thereof. C; Nonda 27
The piston 28 can be put in and taken out from one end and the other end can be taken in and out.
The other end of the sill 27 is connected to the idle arm 35 on the front and rear wheel axle 19 side, and the end of the operating rod 29 is connected to the chassis 68 side. is connected to.

The idle arm 35 has the above-mentioned 421″IηIL
Almost the same as the idler arm 34 on the side of the wheel axle 18, the upper end rotatably connected to the chassis 68 is used as a fulcrum,
The chassis 68 is rotated in the front-rear direction by the drive of the auxiliary guno-schilling 13, and the steering angle of the wheels 70, which are mounted on the front and rear heavy wheel axles 19, is changed.

The knuckle 17 that connects the front and rear wheels 1111+19 is the same as the knuckle 16 equipped with the above-mentioned 1-:+i, and has a knuckle arm 40 and a tie arm 41. The knuckle 17 is configured in an abbreviated single-character shape, and has a front and rear axle (IJI heel (not shown)).
rotation ijJ via king pins 43 at both ends of the
The knuckle arm 4 is connected to the knuckle arm 4 through the drag link 37, and one end of the eye arm 35, which is rotatably connected to the knuckle arm 68, is connected to the knuckle arm 4.
Connected to the 0 end.

Of course, the ends of the tie rod arms 41 of the pair of knuckles 17 are connected to each other via the tie rod 46, and the idle arm 35 is connected to the frontmost end of the pair of knuckles 17.
It is connected to the idle arm 34 on the 11111118 side via a relay rod 44.

Therefore, the auxiliary and no shilling 13 is driven,
Of course, if the idler arm 35 is rotated in the longitudinal direction of the chassis 68, the knuckles 17 thereof rotate around the king pin 43, and the front and rear wheel axles 19 are steered. , such auxiliary power
The force of the Schilling 13 is transmitted via its relay lock 44 to the idle arm 34 on the side of its Jo[tj'+j wheel axle 18, so that the steering force of its main iP No Schilling 12 is compensate.

The control valve 14 is a pump, J? l.

47, those main and auxiliary power shillings 12°13
Left 1) July Squid Port 48 to drive the left turn side
, a right-hand pressure port 49 and a reservoir port 50 for driving the main and auxiliary power cylinders 12 and 13 in the right-turn direction, respectively, and have a pump port 47 therein. That left 4 no? pressure port 4
8, right turn pressure port 49, and reservoir port 5
This is a four-way control valve with a built-in spool (not shown) that is selectively connected to the 0 spool, and the spool 51 is fitted so that the spool 51 is slid back and forth according to the drive of the control lever 51.
, / has been accomplished.

The control lever 51 is moved j47 in response to the operation of the steering wheel 53 of the trunk 67. That is, the control lever 5161,
It is unconnected to the pitman and arm 54 of the steering gear box 52 in the trunk 67 of 'c through a connecting port and door 55.

Month of control valve 14 configured as described above? Nso 0・+1? -) 47 is the hydraulic pressure I? through the hydraulic pressure supply pipe 6o. At the discharge port of N011, the left Jl
li pressure, l? -+-4B is left J note hydraulic piping 61.6
3 through that=)u and auxiliary power shilling 12
゜13 left 4〒iJ? - At 23.30, the right turn pressure 2-1 49 is right! + IJ', piping 62
．． Its i- and auxiliary power shillings 1 through 64
2. Turn right at 13; 14'-to 24+31, and the reservoir moon? -1 and 50 are respectively connected to an oil reservoir 66 via a pressure pipe 65.

The open tandem center valve 15 is
A pair of control valves connected to the le chamber~yl? A valve casing comprising a valve casing and a pair of auxiliary power valves, a spool disposed in a reciprocating sliding capacity in its spool chamber, and a pair of auxiliary power supplies. Snorl is electromagnetic (tg
It consists of an electromagnetic coil that moves the IM, and when the electromagnetic coil is excited, the control
Valve Poe 1-56.

57 respectively, and the Mli assistant, P no shilling, ]? -) 58 + 59 to r7 (Suda, when the electromagnetic coil is energized, the control valve; 45-1-56 wo-' () Ml
i IIJJ·9 No Schilling·, +9 to 58 are configured to connect their mount roll valve ports 57 to their auxiliary power shilling ports 59, respectively.

The electromagnetic filter of the open tandem center valve 15 is electrically connected to an amplifier (not shown) that amplifies a signal from a vehicle speed sensor (not shown), and when the truck 67 is stopped, , and (11y) is configured so that it is excited when traveling at a slow speed.

The opened tandem center valve 15 connects the control valve 14 and its auxiliary 9-power cylinder 13. JJ? /llI pressure shield '63. G
4.

4゛Wow, that open tandem center valve 15 pair of control pulp + po 1.5 G
, 57ha'(control valve 14/11
Ji 5 and right turn pressure port 48.
8 and 59 are connected to Zono h11 subpar r7-, left turn and right turn of Schilling 13, l''-h3o, and 3t, respectively.

Next, the above-mentioned steering system lO is provided.
+ J17p To describe the running of the l-rack 67, when the l-rack 67 is stopped, the electromagnetic coil of the open tandem center valve 15 is excited by No. 111 from the vehicle speed sensor, and the control valve・Port 56 is the auxiliary power cylinder moon? - ports 58 have their control valve ports 57 connected to their auxiliary power cylinder ports 59, respectively.

In such a state, the 4■I pressure pump 11 is activated by the operation of the engineer mounted on the truck 67.
11.1 The operation force of the steering wheel 53 is passed through the steering gear yR' sox 52 to the control lever 5 of the city control valve 14.
1, and if the susol of the control valve 14 is slid to either side, then the pump 0.71 of the control valve 14 of So? 48. ．． 49, and as a result, that oil 11 collar j? Pressure oil from the pump 011 is sent to the cylinder chambers of either the main cylinder or the no cylinder 12, as well as to the cylinder chamber of either the auxiliary blower cylinder 13.

Therefore, when the trunk 67 is stopped, the hydraulic pump 1
Hydraulic lever main and auxiliary iP free silling from 1
2.13 is driven, the frontmost and front and rear wheel axles 18.19
is steered, and the steering is performed with extremely small operating force.

Of course, i:i, that track 67 or Ml? When traveling Jj degrees (tsu, - same as above, the oil pressure, -+5
The moon from f11/Yuteso I: J3 and Ichisuke Power Schilling 12°13 are driven by 6 degrees of freedom traveling 11
11' operation (1/l force is performed when the person is extremely small).

] r, that j-una case car 11, r and - C', in general, sudden steering is not required, and its hydraulic pressure and j? Even if the pressure oil discharge II;- from the cylinder/°11 is relatively small, it will be driven by the i-'5 and the to-ichisuke and the no-shilling 12.13 or I', and therefore its oil pressure 7
”? Shift 011 to Tano 1. Without being a nuisance: 1
Steering by Mio, l: and auxiliary no. e. aS+ consumption rate is improved.

Furthermore, when the traveling speed of the truck 67 increases and it runs normally, the electromagnetic coil of the measuring tandem center valve 15 is connected to the vehicle speed sensor 1, :]'s (lj
The control valves 56 and 57 are each closed, and the auxiliary power cylinders ,+"4 @58.59!J:
will be contacted.

In other words, the moon hoko [1
is sent only to its main power cylinder 12, and its auxiliary power cylinder 13 is free.

Therefore, such a run 11. , i's steering is done only by its 1 Guno Schilling 12, its assistance) e
No cylinder 13 freely follows the steering by its main power cylinder 12 without substantially resisting the steering.

Of course, in the above-described steering, when the steering wheel is in the middle position, the pump port 147 of the control valve 14 is in the reservoir position.
The oil pressure from the oil pump is returned to the oil reservoir 66.

In the above-mentioned steering system 10, it is also possible to configure the 1-P no cylinder 12 and the control valve 14 integrally. In that case, the steering system 10 is miniaturized and easily attached to the vehicle. become applicable. Similarly, the control IJ-le Harz 14 and the steering gear box 52 are integrated into a 1.1
．． 7, or the main cylinder 12, control valve 14, and steering gear box 52 integrally (:, 17j, or furthermore, i+
The steering system 10 is also miniaturized by integrally constructing the cylinder 13 and the Δ-)0n tandem sensor outer valve 15, which improves its applicability to vehicles. .

According to this invention on η11, the oil pressure, -1? and a pair of h2 front wheels connected to both ends of the front +1 shaft for swinging ability] i:・yano cylinder that steers the 1i1+, and the main guno cylinder to supplement its steering force. , a pair of front and rear Ji wheel axles swingably connected to both ends of the front and rear axles, and their /lu lj! The auxiliary guno cylinder connected to one of the wheels 11+ and the steering wheel box control the hydraulic pressure 7I according to the steering force.
? A control valve that changes the flow of pressure oil supplied to the auxiliary power cylinder from 0 to 1, and the state in which the auxiliary power cylinder is interlocked with its main power cylinder, and its auxiliary gun. Switch the pressure oil flowing from the control valve to the auxiliary cylinder to either set the cylinder in a free or resting state.
valve, whose open tandem center valve connects its auxiliary (no cylinder) to its main power
The state in which it is linked to the cylinder, and its auxiliary/warmer
・Since the cylinder is configured to be in any of the states where it is free, the steering of I and 1 requires extremely small operating force. The fatigue caused by such steering is sufficiently reduced by 1
In addition, such steering is possible without increasing the size of the hydraulic pump or the pressure-receiving area of the mono piston in the power cylinder. The load on the engine that drives the pump can be minimized, and the consumption rate of ennon can be improved, making it extremely practical.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a specific example of the steering system used for light rain according to the present invention applied to a front two 11ql+ type trunk, and Fig. 2 is a schematic diagram showing the front and front parts of the steering system shown in Fig. 1. 47 wheels) This is a general view showing the drawing of lfi IE. 10...11 Steering system used in the 11th picture, 11
-Δ1■pressure pump, 12...Main power cylinder, 1
3...kli IJJJ power cylinder, 14.
・Control valve, 15...Open tandem center valve, 18...Front wheel axle, 19...
Front and rear wheel axles. hair/figure

Claims (5)

[Claims] (1) 71t11. l:, Pomfu 0 and 1tii
A pair of frontmost heavy wheels +ll+ connected to both ends of the 11C axis in a swinging 11f manner is steered by the )) 0 and 1[ ■, swinging to both ends 1 of 11N11? A pair of front and rear heavy wheels 11ql + O': A pair of front and rear heavy wheels connected to J function: An auxiliary Zeno cylinder connected to one of the frontmost car's i wheel axle, I + a: U, controlled by a steering gear box, Changing the flow of pressure oil supplied from the hydraulic pump 0 to its main and auxiliary cylinders. Used on vehicles that include an open tandem center valve that switches the pressure oil flowing from the control valve to the auxiliary (auxiliary) or no cylinder so that the auxiliary (auxiliary) cylinder is in either the free state. steering system. (2) 9.1.1' whose main power cylinder and control valve are integrally constructed]
A steering system for use in a vehicle according to claim 1. (3) 4"J'it'F claim 1, Mr. 1's 11ε, in which the vehicle control valve and steering gear box are integrally constructed.
Steering system used for both cars. (4) ) C main no. cylinder, control.
'4. Valve and steering gear box are integrally constructed. '1', iQ value (Light tearing system used in the vehicle of item 1, i+&). (5) Its auxiliary, no cylinder and oats 0n.
Q"f where tandem center valves are integrally formed. A steering system for use in the east direction of the scope of claim 1.