JPS6060020A - Spring characteristic controller for suspension buffer - Google Patents

Abstract

PURPOSE:To improve car-mounting properties as well as to make control of a spring characteristic ever so easy, by coupling one side of either a cylinder or a piston of a buffer, to one side of a car body and a suspension member. CONSTITUTION:Each of double Wishbone-type front suspension couples a knuckle 8, rotatably supporting a wheel 7, to position between tip ends of upper control arms 1 and 4 pivotally attached to each cross member 2 via ball joints 5a and 6. And, a buffer spring 13 and a spring characteristic controller body 14 are installed interposingly between a lower sheet 11 installed in a lower arm 1 and an upper sheet 12 installed in the cross member 2. In this case, a rod 29 solidly installed on the top of a cylinder 17 of the body 4 is bufferedly coupled to the cross member 2 via auxiliary springs 35 and 36. In addition, both upper and lower chambers of the cylinder 17 are connected to an accumulator 45 via solenoid on-off valves 39 and 40.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension for a vehicle such as an automobile, and more particularly to a spring characteristic control device for a shock absorber for a suspension.

In the suspension of vehicles such as automobiles, it is necessary to improve the ride comfort of the vehicle without impairing the handling stability of the vehicle. Various spring characteristic control devices have been proposed in the past that control the spring characteristics as appropriate depending on the driving conditions and the like.

Spring characteristic control devices built into the suspensions of vehicles such as automobiles are required to be lightweight to avoid increasing the weight of the vehicle, and 4M construction is simple in order to improve productivity and reduce manufacturing costs. In order to improve vehicle mountability, it is required to occupy a small space, and in order to control the spring characteristics reliably and appropriately, the control must be easy and the operation must be performed reliably once. is required.

The present invention is an improved spring characteristic control device that satisfies the above requirements (1) required for a spring characteristic control device incorporated into a suspension of a vehicle such as an automobile, and can be incorporated into a vehicle without requiring a design change of other suspension members. The purpose of this invention is to provide a spring characteristic control device.

According to the present invention, the suspension spring, which supports the weight of the vehicle, is loaded between the suspension member and the vehicle body, which is displaced in response to the bounce and rebound of the wheel, and the suspension spring is displaceable in response to wheel bounce and rebound. An auxiliary spring that exerts a spring force between the V suspension portion and the vehicle body when bound or rebounding is used as the spring characteristic control device of the M97 device for the right-hand suspension, and the cylinder a piston that cooperates with the cylinder to define the first and second cylinder chambers; a passage means that communicates and connects the second and second cylinder chambers; and a valve device that selectively blocks communication of the passage means when rebound, and one of the cylinder and the screw 1 is connected to one of the vehicle body and the respension member via the auxiliary spring. This is achieved by a spring characteristic control device of a relaxation vE device for an eggplant suspension, which is configured such that the other of the cylinder and the piston is connected to the vehicle body and the other of the →)° suspension member.

According to this configuration, if the valve device is maintained in an open state in a state where an incompressible fluid such as oil is sealed in the first and second cylinder chambers and the passage means, the cylinder and the piston can be connected to each other. Since it is possible to freely move relative to each other, it is possible to avoid exerting the spring action of the auxiliary spring, and also to connect the first cylinder chamber and the second cylinder chamber with the RFL valve. By cutting off communication,
It is possible to prevent relative movement between the cylinder and the piston, thereby allowing the auxiliary spring to exert a spring action, thereby controlling the opening and closing of the valve device. By doing so, the spring characteristics of the shock absorber can be changed as appropriate depending on the driving conditions of the vehicle, thereby improving the riding comfort of the vehicle without impairing the handling stability of the vehicle. can.

Further, the spring characteristic control device according to the present invention is composed of a cylinder, a piston, a passage means, and a valve device43, and therefore, it is lighter in weight, has a simpler structure, and has a simpler structure than the previously proposed spring characteristic control device. It has a small space, is easy to control, and can be reliably avoided.

Further, in the spring characteristic control HM according to the present invention, C is an incompressible fluid that moves due to the relative movement of the cylinder and the screw I, such as the passage means that communicates and connects the first cylinder chamber and the second cylinder chamber. By providing an A-refrigerator in the middle of the movement route, it is possible to prevent the spring characteristic control device according to the present invention from exerting a vibration damping effect. The shock absorber provided can be omitted.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to embodiments with reference to the figures in appendix <=i.

FIG. 1 is a vertical sectional view of a double wishbone type front suspension incorporating a spring characteristic control device according to the present invention. In the figure, 1 is the cross member 2 of the vehicle body.
3 shows a lower control arm which is pivotally connected by a pivot 3, and 4 shows a seven-piece control arm which is pivotally connected to a cross member 21 by a pivot not shown.

Knuckles 8, which rotatably support wheels 7, are connected to the tips of the lower controller 1-roll arm 1 and the upper controller 1-roll arm 4 via ball joints 5 and 6, respectively. 1. ．． Bound stoppers 9 and 10 are fixed to the control arm 1 and the upper control arm 4, respectively, to prevent the wheels 7 from excessively bouncing and rebounding. The lower control arm 1 is provided with a lower seat 11, and the cross member 2 has a lower seat 12 fixed to the upper seat 1. Between these seats, a 1-contraction coil spring 13, such as a suspension spring, is elastic. equipped. Inside the compression coil spring 13, a main body 14 of a spring characteristic control device according to the invention is arranged.

The main body 14 has a cylinder 17 whose upper end is closed by end walls 15 and 16, and which is inserted into the cylinder 17 so as to be able to reciprocate along an axis 18 and cooperates with the cylinder 17 and the end walls 15 and 16 to form two cylinder chambers. 19. It has a piston 21 defining 20. A q-eye 23 is provided at the tip of the 1-rad portion 22 of the piston 21, and the q-eye 23 is connected to the 1-core control arm 1 via a rubber button. An O-ring 24 is blown into the end wall 16 to seal between the piston and the cylinder 17, and an O-ring 25 is fitted into the end wall 16 to seal between the rod 22. An A seal 27 is fixed to the cap member 26 fixed to the lower end to seal between the cap member 26 and the rod portion 22.

The upper end of the cylinder 17 has a hole 2B provided in the cross member 2, and extends along the axis 18.
0 is fixed. 0712°C) (at positions spaced vertically from cross member 2)
Spring seats 32 and 33 are fixed by 30 and 31. A collar 34 is arranged between the spring seats 1-32 and 33 to maintain a constant distance between them. One ends of auxiliary springs 35 and 36 made of rubber-like elastic bodies are fixed to the spring seats 1 to 32 and 33 by adhesive, and the tips of the auxiliary springs 35 and 36 are in contact with the cross member 2. Thus, the L1 rod 29 is connected to the cross member 2 via the auxiliary springs 35 and 36 in a damping manner.

The main body 14 may be connected to the lower controller 1 and the roll arm at the rod 29, and connected to the 1st member 2 at the rod portion 22 via auxiliary springs 35 and 36.

Cylinder 17 is provided with bows 1-37 and 38 at positions proximate end walls 15 and 16, respectively. These boats are shut off when the piston 21 is vertically displaced by a predetermined amount or more relative to the cylinder '17, thereby preventing the screw 1 heng 21 from further vertically displacing. There is. The boats 37 and 38 are connected to the Aco 1:comulator 45 via conduits 41 and 42 having electromagnetic on-off valves 39 and 40 on their way, and a conduit 44 that connects an A refit 43 on the way. conduit 4
Bypass conduits 46 and 47 are connected to the bypass valves 39 and 40, respectively.
5J: Check valves 48 and 49 are provided to prevent only the flow of fluid toward the main body '14.

Note that the orifice 43 may be omitted when a shock absorber is incorporated.
, Doushi 44, Doushin 4G and 47, Accumulator 45
The liquid chamber 50 is filled with a liquid such as oil.

Compressed air is sealed in the gas chamber 51 of the Akicomulator 45, so that the Akicomulator 45 pressurizes the liquid sealed in the spring characteristic control device, and also pressurizes the liquid sealed in the spring characteristic control device.
[1 Rad part 2] in the cylinder chamber 20 which is 1'1'
It acts to absorb the volume change of 2.

The electromagnetic valves r11jf39 and 40 are of a normally open type, and are opened by a control device (not shown) when the wheel 7 bounces or rebounds by a predetermined amount or more.

Figure 3 shows the opening and closing states of the electromagnetic on-off valves 3 and 40.
This is an illustrative diagram showing the relationship with S-sexuality. In this figure 3, is the electromagnetic 1ifl closed block? 39 and σ40 are in the state of A, that is, 1ff
In the valve state, the liquids in the cylinder chambers 1 and 20 are free to move relative to each other via the conduits 41 and 42, so that the piston 21 is free to move relative to the cylinder 17. , auxiliary springs 35 and 3
6 does not force the spring action, but follows the spring action in the case of 1! I has a characteristic as shown by the solid line in FIG. On the other hand, when either of the magnetic closing valves 39 and 40 is closed, the liquids in the cylinder chambers 19 and 20 cannot move relative to each other, and the relative movement between the piston 21 and the cylinder 17 is prevented. Therefore, in response to the bounce and rebound of the wheel 7, the auxiliary springs 35 and 36 provide elasticity between the cross member 2 and spring seat l-32 and between the cross member 2 and spring seat h 33, respectively. is compressed and exerts a spring action, and in this case the spring Q: i 'I! I has a 47f property as shown by the broken line in FIG.

That is, when the electromagnetic on-off valves 39 and 40 are controlled to open and close as shown in FIG.
When the valve is closed, the gas in the cylinder chamber 19 is blocked, and as a result, the relative movement between the screw 1 hem 21 and the cylinder 17 is stopped by N1, and the main body 14 is in the L1 locked state. The spring 35 is compressed and exerts a spring action, and the spring characteristic +Il after the point P+
has the characteristics shown by broken lines 1) and l)2. Next, when the center wheel 7 moves from the time P2 to the rebound stroke L1-, the liquid in the cylinder chamber 19 becomes I■ at the time pa+, :
Since the force is lower than the back low of the check valve 48, the check valve 48
is closed and liquid is introduced into the cylinder chamber 19, which causes the main body 14 to be in a free state. Therefore, the spring characteristics of the spring from time point 1]1 to time point P3 are the open/close state A of the electromagnetic on-off valve. As in the case of , the characteristic is shown by the solid line P+P3. In the interval from time point I]2 to time point Pa, the electromagnetic on-off valve 110 is maintained in the closed state.

When the -C electromagnetic on-off valve 40 is closed at time 1: a P 3, the liquid in the cylinder chamber 20 is closed, thereby causing the main body 14 to become in the [1ff] state.
Since the auxiliary spring 36 is compressed and exerts a spring action, the spring characteristic 1/1 after time P3 is as shown by the broken line P.
a The characteristics shown in P4. Time point (]1 to 11
3 +, 'tt P < ma-C section, electric 14&
The open/close valve 39 may be in either the closed state or the closed state, but it must be maintained in the closed state in the interval from time point P4 to time point P3. That is, electromagnetic on-off valve 3
9 is the section from point P1 to point []4, that is, the slope in FIG. 3! At any lI & point within the interval marked IQ
It is better to switch from the idle valve state to the closed valve state, and the electromagnetic on-off valve 40 can be switched at any time within the section from time P3 to time P2, that is, the section marked with diagonal lines in FIG. It is sufficient if the state can be switched from the closed state to the closed state. Therefore, since the CC electromagnetic on-off valves 39 and 40 need only be closed and supplied to the electromagnetic on-off valve at any time within the above-mentioned section, the spring characteristics can be easily controlled. be able to.

FIG. 4 is an illustrative diagram showing another embodiment of a hydraulic circuit that may be incorporated into the spring characteristic control 11 device according to the present invention.

In FIG. 4, parts that are substantially the same as those shown in FIG. 1 are designated by the same reference numerals. In this embodiment, the conductors 41 and 42 are connected to each other by a normally open electromagnetic 1ttl closing valve 52, and a solenoid 53 is energized in the middle of the conduit 44 to create an electromagnetic shutoff valve. Along with 52, a normally open g+4 electromagnetic on-off valve 54 with 111 valves is provided.

this! 1. : In a control device that incorporates a hydraulic circuit and has spring characteristics, when the solenoid 53 is not energized and the electromagnetic on-off valves 52 and 54 are maintained in the closed state, the conduits 41 and 42 are Since the liquids in the cylinder chambers 19 and 20 can move freely in contrast, the spring characteristics in this case have the characteristics shown by the solid line at N9 in FIG. On the other hand, if the solenoid 53 is energized and the electromagnetic on-off valves 52 and 54 are closed at times P+ and P3 in FIG.
9 and 20, and the main body 14 is maintained in a locked state. Therefore, when the wheel bounces or rebounds by more than a predetermined amount, the spring characteristics are as shown in Fig. 3. , the broken line P I P 2 and the broken line PaPt - (characteristics as shown, whereby the spring force is appropriately controlled. Also, according to the hydraulic circuit shown in FIG. 4, The number of parts can be further reduced than in the embodiment shown in FIG.

In any of the embodiments shown in FIGS. 1 and 4,
When the piston 21 moves relative to the cylinder 17 while the electromagnetic on-off valves 39 and 40 and the electromagnetic on-off valves 52 and 54 are in the closed state, the liquid in the cylinder chamber 19 flows into the conduits 41 and 42. 4/I, but also between the cylinder chambers 19 and 20 and the liquid chamber 50 of the accumulator 45 via the conduit 4/I, in which case the liquid flowing in the conduit 44 According to the illustrated embodiment, the flow resistance is obtained by
The vibrations applied manually to the wheels 7 can be attenuated, thereby making it possible to omit the shock absorber conventionally incorporated in the suspension.

Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above-mentioned embodiments, and various other embodiments may be made within the scope of the present invention.
It will be clear to those skilled in the art that F. For example, the auxiliary spring may be an air spring, an air spring, a leaf spring, etc., and the spring characteristic control device according to the present invention may be applied to any other suspension such as a McFarlan Stratz Type 8 suspension.し゛(is also applicable.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a double wishbone type (1) unit (1-respension) incorporating a 6g device for controlling spring characteristics according to the present invention, and Fig. 2 is a schematic diagram of the spring characteristics control device shown in Fig. 1. FIG. 3 is an enlarged vertical cross-sectional view showing a portion of the electromagnetic on-off valve, and FIG. It is a chart showing another example of the pressure circuit. 1...Lower control arm, 2...Cross member, 3...Pivot, 4...Upper arm. 6... Balljo, India, 7... Wheel, 8...
knuckle. 9.10...Bound stopper, 1'l...Nisshi-1-912...Upper seat, 13...L[compression coil spring, 14...Body, 15.16...End Wall, 17...Cylinder, 18...l1llll line,
19.20...Cylinder chamber, 2'1...Piston,
22...Rod part, 23...Take Ai. 24.25...0 ring, 26...Key Ir knob member, 27...oil seal, 28...hole, 29...
Rod, 30.31... Oak 1~, 32.33...
Spring seat, 34...Color, 35.3G...
・Auxiliary spring. 37.38... Bau 1~, 39.40... Solenoid on-off valve. 41.42... Conduit, 43... Orifice, 44.
... Guide pile, 45 ... Agumulator, 4G, 47 ...
·conduit. 48.49...Check valve, 50...Liquid chamber, 51...
・Gas supply, 52... Solenoid on-off valve, 53... Solenoid, 54... Solenoid on-off valve utility model registration applicant 1 ~ Yota Hakudosha Co., Ltd. acting agent
Person Patent Attorney Masaki AkashiFigure 2Figure 3

Claims (1)

[Claims] A suspension spring that supports the vehicle body and is elastically installed between the suspension member and the vehicle body that displaces in response to the bounce or rebound of the wheel, and when the wheel bounces or rebounds by more than a predetermined amount, the suspension member and the A spring characteristic control device 11'-L for a suspension shock absorber having an auxiliary spring that exerts a spring action between the cylinder and the vehicle body, and a first cylinder and a second cylinder working together with the cylinder. passage means for communicating and connecting the first and second cylinder chambers, such as a piston defining a chamber;
a valve device that selectively shuts off communication with the passage means when the middle wheel bounces or rebounds for a predetermined distance or more; The spring characteristic of a suspension shock absorbing device is determined by the spring characteristics of a suspension shock absorbing device which is connected to one of the suspension members and the other of the cylinder and the screw is connected to the other of the vehicle body and the suspension member.