JPS58199208A - Car suspension - Google Patents

Abstract

PURPOSE:To prevent sudden increase of spring constant when a spring plate is largely bent by providing the plural number of bumpers with different height between the spring plate of a lamellar spring and a car body in the longitudinal direction of the spring plate at intervals. CONSTITUTION:A lamellar spring 4, a pile of the plural number of spring plates 5... in the direction of their thickness, is provided with clamp mechanisms 7, 7 for controlling increase or decrease of friction between plates at need adjacently to its both ends. The clamp mechanism 7 is cylindrical and operated correspondingly to output from a detector 24 detecting car traveling condition and road surface condition and also handling of a manual switch 26. In this case, the first and the second bumpers 35, 36 are provided on the body 1 side in opposition to the surface of the lamellar spring 4, while the third bumper 37 is provided between both bumpers 35, 36 and on the surface of said spring 4. Further, each bumper 35-37 is so made as to be smaller in height in order.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension system used in vehicles such as automobiles.

This pole suspension device is interposed between the vehicle body and the axle to support the load 1, etc. of the vehicle body, and a device using a stacked plate spring device is conventionally known. That is, as shown in FIG. 111 as an example.

A stacked plate spring d is attached to the vehicle body a via support members s and c, and in order to regulate the maximum amount of deflection of each spring plate 4, a shock absorber called rubber is used. A container f is provided. In other words, this buffer f is a spring plate e...
・A member with a high spring constant that functions as a stone/fP when the spring is greatly bent and prevents damage to the east leaf spring.

For example, hard rubber is used.

Therefore, when a large thrust force is applied to the spring plate C when driving on a rough road or when riding over a convex part of the road surface, the spring plate C bends greatly and hits the shock absorber f directly.
A large impact force is generated because the repulsion constant increases rapidly. This phenomenon is particularly noticeable in the case of spring plates with a small spring constant, that is, in the case of flexible spring plates suitable for driving on smooth roads, and is a cause of worsening riding comfort.

The present invention has been made based on the above circumstances, and its purpose is to provide a suspension system for a vehicle that can prevent the spring constant from increasing rapidly even when the spring plate is largely bent, and can improve riding comfort. There is a particular thing.

That is, the present invention provides a spring plate spring device that is interposed between the unit and the axle, and a spring plate that is spaced apart from each other in the length direction between the spring plate of this electric plate spring device and the vehicle body. This koji for vehicle suspension includes a plurality of shock absorbers provided at different heights relative to the vehicle body or spring plate.

Therefore, when the spring plate is bent, the number of spring plates increases with successive bends as the spring plate sequentially hits these tensioners, resulting in a non-linear spring characteristic.

An IJI embodiment of the present invention will be described below with reference to FIGS. 2 to 5. In FIG. 2, reference numeral 1 indicates the car body, and the east spring plate f! The device is supported. This electric leaf spring assembly WIIL
Reference numeral 4 denotes a plurality of spring plates 5 stacked one on top of the other in the binding direction, and in this embodiment, each spring plate 5 is a Teno 9 spring whose thickness decreases as it approaches the edge of the plate. using a board.

Further, the center portion of each spring plate 5 is restrained by an axle 6 and supports an axle (not shown).

Further, flange machines @y and 7 are provided near the ends of the sheet stacking device 4, respectively.

To explain on behalf of one clan f1!1 structure 7, iJ
As shown in Fig. A, spring plates 5 are inserted between the cylinder body 1o and the plate 11, and the cylinder body 10 and the grate 11 are spaced from each other by a spacing f12. l
i! It is connected to the del door 3°13 through the nut 14.14.

Further, a piston 15 is provided in the cylinder body 10. This piston 15 reciprocates in the direction toward and away from the spring plate 5, that is, in the vertical direction, and a liner 16 is provided on the lower surface of the piston to temporarily protect the spring. 12 is a dust seal, and 18 is an O-ring. Also,
A hydraulic chamber 2 is provided between the piston 15 and the cylinder body 1o.
0 is formed, and an oil passage 21 communicates with this hydraulic chamber 2°.

As shown in FIG. 2, a hydraulic control valve 23 is connected to the oil passage 21. This hydraulic control valve 23 constitutes a part of the controller 22 that operates the clamp machines 2, 2.

This controller 22 includes a detector 424 that detects the steady state of the vehicle body (for example, acceleration speed, speed, #lfl+angle, etc.) or road surface conditions, and a comparator 25 that controls the clamping force.
It is composed of a manual switch 26, the above-mentioned r output pressure control box 23, and the like.

27 is a hydraulic power source.

At a certain position where the clamp mechanism 7.7 is provided, the friction increasing member 30... is provided between the spring plates 5...
is provided. These friction increasing members 30 are, for example, plate-shaped ones made of a material with a coefficient of friction larger than that of the spring plates, such as brake pads, or spring plates with unrounded corners. Adopt. each r
#Friction addition member 30... is the spring plate 6 when not cranked.
A small gap is provided between the splash plate and the splash plate to prevent contact.

In addition, l# friction reducing members 3 are provided at both ends of the spring plates 5...
1... Provided between the cover spring plates. These disconnection reducing members 31 are preferably made of a material capable of reducing the friction between the splash plates, such as a polymer resin, a low friction brass material, or a gripping oil-impregnated member.

As described above, the friction increasing member 30... and the friction reducing member 3
By using 1..., the difference between the plates when the flang is tightened and when the flang is released, compared to the conventional one where the plates are in direct contact with each other! j# It is possible to significantly increase the frictional force and vibration force.

Incidentally, it goes without saying that the magnitude of WI phrase power may be changed continuously or stepwise. Further, the tightening force may be adjusted by manually operating the hydraulic control valve 23 so that the hydraulic pressure against the clamping mechanism 7.7 is 94 m. In addition, the tightening force can be adjusted by relating vehicle speed and oil pressure.
Ii! The blood plate may be placed in the same position as the blood plate (opposite the top surface of 4).

A first loosening device 35 and a second loosening device 36 are provided on the vehicle body 1 side and spaced apart from each other in the length direction of the spring plate. These first. The second looseners 35 and 36 are made of synthetic resin such as urethane foam, or an elastic member such as a coil spring or gas spring, and the length of the first loosener 35 is It is set longer than the second buffer 36.

Furthermore, these first. The third buffer between the second buffer 35.36
A buffer 37 is provided. This third buffer 37
The above 1. A material harder than the second AT shock absorber 35.36, such as rubber or a spring with a high spring constant, is used, and the distance from the unit 1 is the above-mentioned 1° to the second shock absorber 35.36. The distance to the splash plate is greater than the store comb.

In the device of this embodiment configured as described above, when it is desired to increase the friction between the plates of the east spring plate splashing device 4 by manual VJ & operation, such as when traveling steadily on a rough road, the manual switch 26 is operated. outputs a flange signal, and outputs a flange signal to the hydraulic pressure source 2 through the hydraulic control valve 23.
2 pressure oil is guided to the oil flow path 21 to push down the piston 15.

By doing so, the friction increasing property is improved through the friction increasing member 30, and it is suitable for steady driving on rough roads.

When traveling steadily on a good road, operate the 1 manual switch 26 in the opposite direction to the above to cancel the crank flB signal from the comparator 25, operate the hydraulic control valve 23, and release the signal from the hydraulic source 27. The pressure oil is cut off to eliminate the pressure in the oil flow path 21. As a result, the force of the spring plate #Ij+1 by the piston 15 is released, and the friction between the plates can be reduced.

In such a rung-released state, the spring plates 5 come into contact with each other via the friction reducing member 3 at the end thereof, so the friction between the plates is extremely small. Become. Therefore, the dynamic spring constant is also minimized, and riding comfort on good roads is improved.

In addition, when the vehicle body tries to tilt while driving on a good road, for example to make a curve or change to a single track, or when the road surface condition deteriorates, the detector 24 detects this and the flange The signal will be output automatically. Then, the hydraulic control valve 23 operates to push down the piston 15 and flang the splash plates 5 . Therefore, as in the case of manual operation, the friction between the plates increases, and steering stability and comfortable riding comfort can be ensured.

According to the above device, when the spring plates 5... are bent, the upper surface of the spring plates first comes into contact with the first shock absorber 35, and the effective width of the spring plates 5... is reduced. constant change,
The spring constant of the buffer 35 increases the spring constant of the stacked plate spring device. If the spring plate is deflected further, the spring plate will also come into contact with the second 81% machine 36.

Then, when the load 1 is further applied, it also hits the third buffer 37, resulting in the maximum spring constant.

In other words, the spring becomes a nonlinear spring as shown in FIG. 185, and the spring constant gradually increases. Therefore, when a large upthrust force is applied to the spring plates 5, such as when traveling on a rough road or when riding over a convex part of the road surface, the flang mechanism 7.7 is tightened to increase the vibration force between the plates. Along with letting
By sequentially bumping the first to IS3 shock absorbers 35, 36, 37 against the spring plates according to the deflection of the spring plates 5..., it is possible to suppress the moving parts due to a sudden increase in the spring constant, and the riding comfort is greatly improved. This will improve the results.

In addition, in the first embodiment, the first degree I is attached to the vehicle body 1 (1&ll).
Although the buffers 35 and 36 of n2 were provided, as shown in FIG.
A second buffer 35,36 may also be provided.

Further, FIG. 887 and FIG. 8 show a third embodiment of the present invention, and the flang mechanism 7.7 in this case differs from the first embodiment in that it does not use a working medium such as hydraulic pressure. This is different from the second embodiment. That is, a movable grate 40 is supported on the gel plate 13.13 so as to be able to move up and down, and a first movable plate 40 is provided on the upper surface of each movable plate 40.
A buffer 35 or a second buffer 36 is attached. Since the other configurations are similar to those of the previous embodiment, corresponding common parts are given the same reference numerals and explanations will be omitted.

In the third embodiment configured as described above, the spring plate b...
When it bends, the first thing that happens is the SL shock absorber 35 hits the car body! The movable plate 40 is pressed downward by contacting the side, and the friction increasing member 3
0... to tighten each spring plate 5.... Therefore, the friction between the plates increases, and the spring constant of the electric plate spring device increases due to the change in the spring constant due to the decrease in the effective force of the spring plate and the spring constant of the spring plate 36 itself. . Similarly, by sequentially contacting the second shock absorber 36 and the third shock absorber 37 with the vehicle body side, the spring constant can be changed nonlinearly as in the first embodiment described in MiJ. That is, this third embodiment has the advantage that the structure is extremely simple because no working medium such as hydraulic pressure is used.

Further, as shown in FIG. 9 as a fourth embodiment, the shock absorber 35 may be attached to the upper surface of the hydraulic crank fsI structure 7.

Note that the number of buffers is not limited to 3, but also 2s or 4w1.
ζ may be provided so as to be greater than F9'r. Further, the material, hardness, and constant of each shock absorber may be arbitrarily selected so as to obtain the desired spring characteristics of ψ, and needless to say, they are not limited to the above-mentioned embodiments.

As described in the present invention, a non-linear spring characteristic in which the spring constant gradually increases can be achieved by providing the dampers that are in contact with the spring plate in sequence according to the amount of deflection of the spring plate. Therefore, even if the spring handling is greatly bent during special trips on rough roads, the pants J with a high spring constant like the conventional ones? -Ride comfort can be significantly improved by eliminating the impact caused by the rubber hitting the vehicle body directly.

[Brief explanation of drawings]

FIG. 81 is a side view showing an example of a conventional suspension device with a flang mechanism. 182 to 5 show the first embodiment of the present invention, FIG. 2 is a curved view of the suspension system, FIG. 3 is an enlarged side view of the flang mechanism, and FIG. '1-I
A sectional view taken along the V line, and FIG. 5 is a splash characteristic diagram. Fig. 6 is a side view showing the second embodiment 'ItA IJ of the present invention, Fig. 11I87 is a side view showing the third embodiment 9 of the present invention, and Fig. 9IIIJ8 is the line ', I--1 in Fig. 7. FIG. 9 is a side view showing a fourth embodiment of the present invention. ! ...Vehicle body 4...Stacked plates! i15... Spring plate, No. 5, 36. 37... Shock absorber applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 30 5 11 1. Case display characteristics Application No. 57-80608 2, Name of the invention Vehicle suspension system 3, Relationship to hN+E case Patent applicant (464) Nippon Hakki Co., Ltd. 4, Agent

Claims (1)

[Claims] A stacked plate spring device interposed between the vehicle body and the axle, and a spring plate provided between the spring plate of the stacked plate spring device and the vehicle body, spaced apart from each other in the length direction of the spring plate, and separated from each other by the vehicle body or the vehicle body. A suspension system for a vehicle characterized by comprising a plurality of shock absorbers whose heights are parallel to each other with respect to a spring plate.