JP2001026208A - Spring seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a coil spring always in an initial setting position or an offset initial setting position so as to prevent a coil spring form rotating in a coil winding circumference direction. SOLUTION: In a spring seat S of a shock absorber type or strut type automobile suspension device which is inserted and attached to a shock absorber through an attachment part 1 so as to support a coil spring K arranged to maintain a spring load action line 03 coaxial or offset against a shock absorber rod center 01, a spiral spring support surface 2 facing a wind-up end portion K1 of the coil spring K, plural locking pieces 3a, 3b, 3c, 3d standing up outside of the spring support surface 2, three projections 5a, 5b, 5c separately provided on the spring support surface 2 along a spiral direction, an inclined step part 4 provided at a terminal end of the spring support surface 2 are formed. The contact surface of the wind-up end portion K1 is mounted on the three projection 5a, 5b, 5c while maintaining contact of a base end K2 of the coil spring K on the inclined step part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strut type shock absorber in a vehicle suspension system or a spring seat mounted on a shock absorber having no knuckle bracket.

[0002]

2. Description of the Related Art Generally, a suspension system for a vehicle such as an automobile using a strut-type shock absorber or a shock absorber without a knuckle bracket includes a lower spring seat attached to the outer periphery of the shock absorber and an upper spring seat on the vehicle body side. A coil spring is arranged between the two to extend and contract freely.

In this case, the shock absorber is attached to the wheel at an angle via a lower arm, and in particular, in the case of a strut type shock absorber, the spring load action line of the coil spring is applied to the axis of the shock absorber. In general, the motor is arranged at an arbitrary angle offset to generate a moment in the opposite direction to the moment due to the road surface reaction force acting on the shock absorber via the wheels.

A spring seat in a strut type shock absorber is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 54-33519.
As shown in the publication, a cylindrical mounting portion for the shock absorber, a helical spring supporting surface provided continuously above the mounting portion, and a collar portion provided on the outer periphery of the spring supporting surface or a lock standing upright. It is usually formed as a funnel or trumpet with a piece.

When the spring seat is attached to the shock absorber via a mounting portion, for example, as a lower spring seat, the lower surface of the spiral winding portion below the coil spring extends along the spring bearing surface over a predetermined length. And support them.

When the above-mentioned spring seat is attached to the shock absorber and the load acting line of the coil spring is offset with respect to the axis of the shock absorber, a large lateral bending moment due to the road surface reaction force causes the shock absorber. , The moment in the direction opposite to this bending moment acts on the shock absorber from the coil spring, canceling out the lateral force due to the bending moment on the shock absorber,
The frictional force in the axial direction of the shock absorber and the frictional force in the rotational direction of the shaft can be reduced, and the riding comfort of the vehicle is improved.

[0007]

However, when the spring supporting surface of the spring seat and the lower surface of the lower winding portion of the coil spring are in uniform contact, the load from the coil spring is uniform over the entire area of the spring supporting surface. Although it is carried, if there is a processing error in the spring bearing surface or if the processing accuracy of the coil spring is poor, the lower surface of the winding part of the coil spring cannot abut the spring bearing surface uniformly, and as a result, the coil spring will When compressed by the lifting force from the vehicle or the load from the vehicle body direction, the load concentrates on the part in contact with the spring bearing surface, and the spring load action line differs from the initial setting state. The shock absorber will not operate smoothly or generate the desired moment. Not, sometimes bad or not be overcome lateral force of the shock absorber according to the road surface reaction force, the ride comfort and tilting in the direction in which the vehicle body is unexpected.

Further, in addition to the fact that the state of generation of the moment changes in various directions as described above, the coil spring has the property of rotating in the winding direction when compressed, so that the spring If it does not contact the bearing surface evenly, the coil spring will be displaced during repeated expansion and contraction, and it will not be possible to maintain the predetermined offset position, which may further deteriorate the riding comfort.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a suspension system for a vehicle in which a coil spring can be held coaxially with the axis of a shock absorber, or can be held at an initial set position which is always offset, so that the position is not shifted in the winding direction. Is to provide a spring seat.

[0010]

Means for Solving the Problems To achieve the above object, one means of the present invention is to insert a spring load acting line with respect to a shaft center of a shock absorber, which is inserted into a shock absorber via a mounting portion. In a spring seat for a shock absorber type vehicle suspension supporting a coaxially disposed coil spring, a helical spring supporting surface facing an end winding portion of the coil spring and a plurality of engagement members standing outside the spring supporting surface. A stop piece, three projections spaced along the spiral direction on the spring bearing surface, and an inclined step provided at the end of the spring bearing surface are formed, and the base end of the coil spring is formed on the inclined step. It is characterized in that the contact surface of the end winding portion is placed on the three projections while making contact.

Another means is a strut-type vehicle suspension device for supporting a coil spring which is inserted into a shock absorber via a mounting portion and is arranged with a spring load action line offset with respect to the axis of the shock absorber. A helical spring bearing surface facing the end winding portion of the coil spring, a plurality of locking pieces standing outside the spring bearing surface, and being spaced along the helical direction on the spring bearing surface. Three projections, and an inclined step portion provided at the end of the spring bearing surface are formed, and the contact surface of the end winding portion is brought into contact with the three end portions while the base end of the coil spring contacts the inclined step portion. It is characterized in that it is placed on the projection.

In each of the above means, it is preferable that the three projections are formed by expanding or cutting and raising a part of the spring bearing surface upward.

In the above-mentioned other means, the center of gravity of a triangle having three projections as vertices is preset so as to coincide with the spring load acting line of the coil spring offset from the axis of the shock absorber.

[0014]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given based on FIGS.

The spring seat of the present invention is mounted on a strut type shock absorber in a vehicle suspension system, and serves as a lower spring seat for supporting a coil spring in which a spring load acting line is offset with respect to the axis of the shock absorber. While suitable for use, it can also be used as an upper spring seat or as a spring seat for a shock absorber in a typical vehicle suspension without a knuckle bracket.

Hereinafter, an example of application to a strut type shock absorber will be described in more detail.

The spring seat S is formed in a funnel shape or a trumpet shape, and has a cylindrical mounting portion 1 and a helical spring support surface 2 connected to the mounting portion 1 via a conical portion.
And four locking pieces 3a, 3b, 3
c, 3d, an inclined step portion 4 provided downward at the end of the spring support surface 2, and three projections 5a, 5b, 5c spaced along the spiral direction on the spring support surface 2. ing.

The three projections 5a, 5b, 5c are formed by bulging the spring bearing surface 2 at the same height from the lower side to the upper side in the case of the illustrated lower spring seat.
A portion of the spring support surface 2 may be cut and raised, or a plate having an arbitrary thickness may be joined by welding or the like.

Although not shown, in the case of an upper spring seat, the spring support surface 2 is formed from above to below.

As shown in FIG. 3, the spring seat S
Are fixedly inserted into the outer periphery of the shock absorber A via the mounting portion 1 as a lower spring seat.

However, the spring seat S can also be used when it is provided on a piston rod mounted on the vehicle body as an upper spring seat.

In use, a coil spring K is disposed on the contact surface of the spring seat S, and the coil spring K is mounted on the three projections 5a, 5b, 5c with the lower surface of the lower winding portion K1 as an end. The end, which is the base end K2 of the coil spring K, is also in contact with the inclined step portion 4.

The inclined step portion 4 functions as a stopper for preventing the base position from shifting by rotating in the direction opposite to the winding direction when the coil spring K is compressed.

As shown in FIG. 1, the coil spring K
Is arranged such that its load acting line 03 is offset by an arbitrary distance with respect to the axis 01 of the shock absorber A.

As shown in FIG. 2, the projections 5a, 5b, 5c
Is offset from the axis 01 of the shock absorber A, and this center of gravity 02 is
Is aligned with the load acting line 03 of the coil spring K.

Therefore, when the winding portion K1 of the coil spring K is placed on the three projections 5a, 5b, 5c, the load application point of the coil spring K is inevitably The bending moment from the coil spring K, which coincides with the center of gravity 02 and cancels the bending moment due to the road surface reaction force acting on the shock absorber A, acts on the triangular center of gravity 02, thereby improving the slidability of the shock absorber A. To

Further, when a compressive force is applied to the coil spring K by a lifting input from the road surface or a load from the vehicle body, the coil spring K always has three projections 5a, 5b,
5c, the coil spring K is uniformly contacted and supported, and the coil spring K is not displaced, and the spring load acting line of the coil spring K is held at the position of the center of gravity 02 of the triangle B.

Since the load and external force acting on the coil spring K from the vehicle body are not always constant according to the type of vehicle, the triangle B is assumed in advance by assuming the spring load action line of the coil spring K according to the type of vehicle. It is preferable that the center of gravity 02 is set, and the positions of the three protrusions 5a, 5b, 5c are set in accordance with the position of the center of gravity 02.

[0029]

According to the present invention, the following effects can be obtained.

According to the present invention, since the three projections are spaced from each other on the spring support surface, even if the rotation of the spring support surface, the processing accuracy of the coil spring, and the winding angle are slightly deteriorated, the coil spring can be used. The raised part of the end always comes into contact with the three projections, the three projections uniformly support the compression load of the coil spring, and the entire load from the coil spring is carried by these three projections. Since the displacement is prevented, the load acting line of the coil spring can always be made coincident with the center of gravity of the triangle formed by the three projections, and the initial setting state can always be maintained. For this reason, the vehicle body can be stably held as the vehicle suspension device. Especially in the case of a strut type shock absorber, the initial offset state can always be maintained,
The bending moment by the coil spring can be kept at the initial setting to exert a canceling effect, and the axial frictional force and the rotational frictional force of the piston rod of the shock absorber can be minimized, improving the riding comfort of the vehicle. As well as improving the maneuverability.

Similarly, since the base end of the coil spring comes into contact with the inclined step, even if a compressive force acts on the coil spring, the coil spring does not rotate in the circumferential direction including the winding direction, and therefore, the offset of the coil spring Since the position is not changed, the initial setting state can be maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a relationship between a spring seat and a coil spring according to the present invention.

FIG. 2 is a plan view of the spring seat of FIG. 1;

FIG. 3 is a vertical sectional front view of the spring seat of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Attachment part 2 Spring bearing surface 3a, 3b, 3c, 3d Locking piece 4 Inclined step 5a, 5b, 5c Projection 01 Shaft core 02 Center of gravity 03 Load acting line A Shock absorber B Triangle K Coil spring K1 Lower winding part K2 base End S Spring seat

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[Procedure amendment]

[Submission date] July 13, 1999 (1999.7.1)
3)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Continued on the front page (72) Inventor Yoshikazu Chino 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd. F-term (reference) 3D001 AA17 BA02 DA01 DA03 3J069 AA50 CC02

Claims (4)

[Claims] 1. A spring seat for a shock absorber type vehicle suspension device which is inserted into a shock absorber via an attachment portion and supports a coil spring in which a spring load acting line is coaxially arranged with respect to the axis of the shock absorber. A helical spring supporting surface facing the wound end portion of the coil spring, a plurality of locking pieces standing outside the spring supporting surface, and three protrusions spaced along the helical direction on the spring supporting surface. And an inclined step portion provided at the end of the spring support surface, and the contact surface of the end winding portion is placed on the three protrusions while the base end of the coil spring is in contact with the inclined step portion. A spring seat in a vehicle suspension device, wherein the spring seat is disposed. 2. A spring seat for a strut-type vehicle suspension device, which is mounted on a shock absorber via an attachment portion and supports a coil spring arranged with a spring load acting line offset with respect to the axis of the shock absorber. A helical spring supporting surface facing the wound end portion of the coil spring, a plurality of locking pieces standing outside the spring supporting surface, and three protrusions spaced along the helical direction on the spring supporting surface. And an inclined step portion provided at the end of the spring support surface, and the contact surface of the end winding portion is placed on the three protrusions while the base end of the coil spring is in contact with the inclined step portion. A spring seat in a vehicle suspension device, wherein the spring seat is disposed. 3. The spring seat according to claim 1, wherein the three projections are formed by bulging or cutting a part of the spring support surface upward. 4. The spring seat according to claim 2, wherein the three projections are formed by bulging or cutting a part of the spring support surface upward.