JP2003254369A - Rubber sheet for coil spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber sheet for a coil spring, in which upward lift-off of a peripheral end of the rubber sheet in a position interposed between a specified support member and the coil spring is prevented, and increase in abrasion loss and occurrence of damage caused by entrance of foreign materials between the rubber sheet and the support member are prevented. <P>SOLUTION: A first groove 18 is formed to be continuously or discontinuously extended in a circumferential direction in at least one of faces on a coil spring 34 side or on a side opposite to the coil spring. The first groove 18 is positioned outside in a radial direction of a first-turn coil portion 48a at the lowermost of the coil spring 34. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rubber sheet for a coil spring, and more particularly, in a suspension system (vehicle suspension device) in which a coil spring is arranged between a wheel side member and a vehicle body side member, an end portion of the coil spring. The present invention relates to a rubber sheet for a coil spring, which is preferably used for supporting the coil spring by abutting against each other.

[0002]

BACKGROUND ART As is well known, a rubber sheet for a coil spring used in a suspension system as described above generally has a disk-shaped overall shape having a predetermined thickness, and a central portion and its center. A through hole penetrating in the thickness direction is provided in the vicinity of the wheel side supporting member that supports the end portion of the coil spring via a rubber sheet, and is provided upright there. Alternatively, the fixing pin, the protrusion, or the like provided so as to project through such a supporting member is arranged in a state of being inserted into the through hole. Then, under such an arrangement, the coil spring is placed in contact with the coil portion of the first coil located at the lowermost position of the coil spring arranged between the support member and the vehicle body. By being interposed between the coil spring and the support member, the transmission of vibration between the coil spring and the support member can be suppressed.

By the way, in the rubber sheet for the coil spring used in such a suspension system, when the coil spring is compressed due to the input of external force,
The coil spring applies a pressing force according to the magnitude of the external force. For example, when a large load is applied to the coil spring while the vehicle is traveling, the pressing force applied by the coil spring is applied. As a result, there has been a phenomenon in which the outer peripheral end portion is rolled up (lifted) from the support member.

In such a rubber sheet for a coil spring, when the above-mentioned rolling-up phenomenon from the supporting member occurs, sand, pebbles, mud, etc. are left between the outer peripheral end of the rolled-up rubber sheet and the supporting member. Foreign matter easily invades and accumulates, and as a result, the amount of abrasion of the rubber sheet increases significantly due to rubbing against the accumulated foreign matter, and in some cases damage or cracks occur, resulting in a long service life. It caused serious problems such as becoming extremely short.

[0005]

The present invention has been made in view of the circumstances as described above, and a problem to be solved by the invention is a rubber sheet for a coil spring, particularly a wheel side member and a vehicle body side member. In the suspension system in which the coil spring is arranged between the coil spring and the rubber sheet for the coil spring which is applied to support the coil spring by abutting the end of the coil spring, the pressing force applied from the coil spring causes It is possible to prevent the outer peripheral end portion from curling up from the supporting member that supports the coil spring through the rubber sheet, and increase the amount of wear due to the entry of foreign matter between the outer peripheral end portion and the supporting member. By eliminating the occurrence of damage and cracks,
It is an object of the present invention to provide a novel structure which can advantageously prolong the service life.

[0006]

According to the present invention, in order to solve such a problem, an end portion of a coil spring is abutted,
In a rubber sheet for a coil spring that supports the coil spring, a first groove extending continuously or discontinuously in the circumferential direction on at least one surface of the coil spring side and the opposite side thereof, A rubber sheet for a coil spring, which is formed so as to be located radially outward of a first coil portion of the coil spring which comes into contact with the rubber sheet, has as its gist.

That is, in the rubber sheet for a coil spring according to the present invention, since the first groove is formed on at least one of the coil spring side and the opposite side, the first groove is formed. The portion where the groove is formed is thinner than the other portions, and the thin portion including such a portion where the first groove is formed corresponds to the disposition of the first groove. The coil spring is positioned radially outward of the coil portion of the coil spring, which is in contact with the rubber sheet, in a state of continuously or discontinuously extending in the circumferential direction of the forming surface.

Therefore, in the rubber sheet for a coil spring according to the present invention, the supporting member for supporting the coil spring through the rubber sheet by the pressing force applied from the coil spring in response to the input of the large load to the coil spring. When a force is exerted in the direction of rolling up the outer peripheral end from the above, the inner peripheral part of the first groove is lifted by the acting force, but the first groove forming part is raised. The thin-walled portion made of is bent so that the outer peripheral portion with respect to the first groove forming portion inclines downward toward the peripheral portion, in other words, the outer peripheral end portion remains in contact with the support member. That is, the entire rubber sheet can be in a state of being floated in a mountain shape with the first groove forming portion as the top.

Therefore, the rubber sheet for a coil spring according to the present invention as described above, for example, when applied to support the coil spring forming a part of the suspension system, is pushed by the coil spring. The pressure may advantageously prevent the outer peripheral edge from rolling up from the support member supporting the end of the coil spring through the rubber sheet, whereby sand between such outer peripheral edge and the support member. Invasion of foreign matter such as pebbles, pebbles, and mud can be reliably prevented, and the increase in the amount of wear due to friction with these foreign matter and the occurrence of cracks, damage, etc. can be effectively eliminated. As a result, the extension of the service life can be achieved extremely advantageously.

According to one of the preferred embodiments of the rubber sheet for a coil spring according to the present invention, the coil spring is provided between the wheel side member and the vehicle body side member in the vehicle suspension system (suspension system). The rubber sheet is disposed and the rubber sheet is interposed between the coil spring and the wheel-side member. In the rubber sheet for a coil spring having such a structure, the coil spring is supported by contacting the ends of the coil spring arranged between the wheel side member and the vehicle body side member in the suspension system. Under the condition applied to, the extension of service life can be surely achieved.

According to another advantageous aspect of the rubber sheet for a coil spring according to the present invention, the surface of the side on which the first groove is formed extends from the first groove. A second groove is formed that extends continuously toward the outer peripheral edge of the and is laterally open at the outer peripheral edge.

In the rubber sheet for a coil spring having such a structure, when the first groove is formed on the upper surface of the rubber sheet, the second groove is also formed on the upper surface of the rubber sheet. , Thereby, for example, even when water or the like enters the first groove, the water can be reliably discharged from the first groove to the outside through the second groove.
It can be advantageously prevented that the coil spring is rusted by the water accumulated in the first groove. Further, when the first groove is formed on the lower surface of the rubber sheet, the second groove is also formed on the lower surface of the rubber sheet, whereby the first groove is formed by the pressing force applied from the coil spring, for example. Even if air rises in a mountain shape with the groove as the top and air enters between the rubber sheet and the support member, the air can be smoothly discharged to the outside through the second groove, and thus added from the coil spring. When the pressing force is released, the entire rubber sheet can be smoothly and quickly returned to its original state.

Further, according to another preferred embodiment of the rubber sheet for a coil spring according to the present invention, the first groove has a mountain shape which is convex toward the outer peripheral portion of the surface on the side where the first groove is formed. The extending mountain-shaped groove portion and the valley-shaped groove portion extending in a valley shape that is recessed toward the inner peripheral portion of the surface are configured to have a bent shape that is alternately arranged in the circumferential direction.

In the rubber sheet for a coil spring having such a structure, for example, even when the coil spring is composed of a barrel-shaped coil spring, it is located at the lowest position when the coil spring is compressed. When a coil part such as a second coil or a third coil having a larger diameter than the coil part of the first coil is brought into contact with the surface with which the coil part of the first coil contacts, they are in the first groove. It can be advantageously avoided that the outer peripheral end portion is prevented from rolling up from the support member as described above, and the excellent characteristics obtained thereby can be more effectively exhibited. is there.

Furthermore, according to another preferred embodiment of the rubber sheet for a coil spring according to the present invention, the first groove is brought into contact with the coil portion of the first winding located at the lowest position of the coil spring. It is formed only on the surface opposite to the surface to be formed.

If such a construction is adopted, the first groove is formed on the lower surface of the rubber sheet, whereby the first coil portion of the first winding located at the lowermost position of the coil spring is Can be effectively eliminated, and the above-mentioned prevention of rolling up from the support member at the outer peripheral edge and the excellent characteristics obtained thereby can be more effectively exhibited. It can be done.

In addition, in the rubber sheet for coil springs having such a structure, sand, pebbles, mud, or water in the first groove is provided as compared with the case where the first groove is provided on the upper surface of the rubber sheet. Invasion and retention of foreign matter such as can be more advantageously eliminated or suppressed, thereby increasing the amount of wear due to rubbing with such foreign matter, occurrence of damage, etc. can be more effectively prevented. Further extension of life can be effectively realized.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION In order to more specifically clarify the present invention, the structure of a rubber sheet for a coil spring according to the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows an embodiment of a rubber sheet for a coil spring having a structure according to the present invention.
A rubber sheet for a coil spring, which is interposed between a lower arm and a coil spring of a 5-link suspension, which is a kind of automobile suspension, is schematically shown in its upper surface form and vertical cross-sectional form. As is clear from these figures, the rubber sheet 10 is made of the same rubber material as the conventional product, and has a thickness of about 9 mm and a diameter of about 145 mm as a whole, and is relatively similar to the conventional one. It has a thick disk shape. Further, in this rubber sheet 10, a circular center hole 12 is provided in the center thereof, and
A taper cylinder portion 14 having a diameter gradually decreasing toward the tip is integrally formed with the peripheral edge portion of the center hole 12 so as to project upward, and thus the taper cylinder portion 16 and the annular plate portion 16 are tapered. As an integrally molded product having a cylindrical portion 14,
It is configured.

Also, in the rubber sheet 10 of this embodiment, unlike the conventional product, the lower surface of the annular plate portion 16 is a flat surface, while the upper surface of the annular plate portion 16 is The one groove 18 is formed so as to extend continuously in the circumferential direction. Further, the first groove 18 has a mountain-shaped groove portion 20 extending in the circumferential direction with a mountain shape that is convex toward the outer peripheral portion of the annular plate portion 16 and a valley shape that is recessed toward the inner peripheral portion. A plurality of grooves (6 in this case) are formed so that the valley-shaped groove portions 22 extending in the direction are alternately located in the circumferential direction.
It is configured to have a floral pattern form in which each piece is arranged.

Here, in particular, as described later,
In the state in which the rubber sheet 10 is interposed between the lower arm (30) and the coil spring (34) that form the rear suspension (36), the coil of the lowest coil of the coil spring (34) is the first coil. Part (48a)
It comes to be brought into contact with the upper surface of the annular plate portion 16 (see FIG. 3), but on the upper surface of the annular plate portion 16, the coil portion (48a) of the first winding of the coil spring (34) is The coil portion (48a) rather than the contact portion
The first groove 1 so that each trough-shaped groove portion 22 having the concave groove shape of the first groove 18 is located radially outward of the first groove 1.
The whole 8 is formed in the radial intermediate portion of the upper surface of the annular plate portion 16 at a position separated from the tapered cylindrical portion 14 by a predetermined distance to the outside in the radial direction.

In the rubber sheet 10, the depth of the first groove 18 is set to, for example, about 5 mm, which exceeds half the thickness of the annular plate portion 16, while the width of the first groove 18 is increased. The width of the first groove 1 is about 3 mm, so that the first groove 1 in the radial middle portion of the annular plate portion 16 is formed.
The thin portion 24 in which the forming portion of 8 is thinner than the thickness of other portions in a relatively narrow width by less than half.
It is said that. The depth and width of the first groove 18 are not limited to the illustrated ones, and may be appropriately determined according to the thickness and size of the annular plate portion 16, and , Annular plate portion 16, and further rubber sheet 10
It goes without saying that the total thickness and size can be variously changed.

Further, on the upper surface of the annular plate portion 16 of the rubber sheet 10 in which the first groove 18 as described above is formed, from the top of each chevron-shaped groove portion 20 in the first groove 18,
A second groove 26, which extends continuously in a straight line along the radial direction toward the outer peripheral edge portion of the upper surface and opens laterally at the outer peripheral edge portion, is provided one by one corresponding to each top portion. (Here, a total of 6) are provided.

Further, the depth of each of the second grooves 26 is the same as that on the first groove 18 side, and the bottom surface of the second groove 26 extends from the first groove 18 to the annular plate portion. The inclined surface 16 is inclined downward toward the outer peripheral edge portion and is configured to be gradually deeper toward the outer peripheral edge portion. The width of the second groove 26 is about 5 mm. As a result, here, as will be described later,
Even if water or the like enters the first groove 18 under the condition that the rubber sheet 10 is used by being assembled to the lower arm (30), the water flows through the second groove 26 and the first groove 18. 1
8 can be smoothly discharged. Of course, the width and depth of the second groove 26 are not limited to this.

Further, in the rubber sheet 10, from the tops of the valley-shaped groove portions 22 in the first groove 18,
The lightening portion 28 that extends continuously in a straight line along the radial direction toward the outer peripheral edge of the upper surface of the annular plate portion 16 and has a wide groove shape that opens to the side at the outer peripheral edge.
, Respectively (here, 6 in total) are provided, but this is mainly for tuning the spring characteristics of the annular plate portion 16 and further for the rubber sheet 10 as a whole, and also for the annular plate portion. It is for collecting sand, pebbles, mud, water, etc. that have invaded on the upper surface of 16 and discharging them to the outside through an opening to the side.

Thus, the rubber sheet 10 having such a structure has, for example, as shown in FIG. 3, a lower arm 30 and a vehicle body side member 32 connected to a wheel of an automobile.
In the rear suspension 36 having a structure in which the coil spring 34 is disposed between the coil spring 34 and the coil spring 34, the coil suspension 34 is used by being interposed between the lower arm 30 and the coil spring 34.

More specifically, here, the coil spring 3 in the lower arm 30 of the rear suspension 36 is used.
A lower sheet 42 is fixed to the upper surface of the support portion 38 of No. 4 by welding or the like. The lower sheet 42 is made of metal and has an annular plate shape, and an inner peripheral portion thereof is integrally formed with a tapered cylindrical portion 44 having a tapered cylindrical shape whose diameter gradually decreases toward the tip so as to surround the central hole 46. It is formed and configured so that the tapered cylindrical portion 44 is formed so as to project on the support portion 38 in a state in which it is immovably fixed to the upper surface of the support portion 38 of the lower arm 30. It has become.

Then, the rubber sheet 10 of this embodiment is placed on the lower sheet 42 arranged on the supporting portion 38 of the lower arm 30 as described above.
0, a coil spring 34 is provided at a lower end thereof supported by the rubber sheet 10 and at an upper end thereof supported by the vehicle body member 32.

That is, in the rubber sheet 10, the tapered cylindrical portion 44 of the lower sheet 42 is inserted into the center hole 12 and the inner hole of the tapered cylindrical portion 14, and the entire lower surface of the annular plate portion 16 and the tapered cylindrical portion 14 are inserted. Part of the inner peripheral surface of the lower seat 42 is brought into contact with the upper surface of the lower seat 42 and the outer peripheral surface of the tapered cylindrical portion 44, respectively. It is set up. In addition, the coil spring 34 is externally inserted and arranged at the lower end portion of the tapered cylindrical portion 14 of the rubber sheet 10 and is the uppermost coil portion 48b of the plurality of coil portions 48.
Is abutted (contacted) with the lower surface of the vehicle body-side member 32 and supported, while the coil portion 4 of the first winding, which is the lowest stage thereof, is supported.
8a abuts (contacts) on the upper surface of the annular plate portion 16 of the rubber sheet 10 with the boundary portion with the tapered cylindrical portion 14 located inside the thin portion 24 that is the formation portion of the first groove 18. Is supported.

Thus, the rubber sheet 10 is connected to the wheel (not shown) by the supporting portion 38 of the lower arm 30.
Is interposed between the lower seat 42 and the coil spring 34 supported by the vehicle body side member 32.
When the coil spring 34 is compressed, the coil spring 3
By being elastically deformed by the pressing force applied from 4, the transmission of vibration between the coil spring 34 and the lower arm 30 can be suppressed.

In such a rubber sheet 10, the upper surface of the annular plate portion 16 is arranged in the radial direction more than the portion where the lowermost coil portion 48a of the coil spring 34 abuts. A thin wall portion 24, which is a portion where the first groove 18 continuously extends in the circumferential direction, is provided at a position on the outer side of the coil spring 34, as shown by a two-dot chain line in FIG. At the time of compression of the coil spring 34 due to the load of, the downwardly pressing force is applied by the coil portion 48a of the first stage of the lowermost stage of the coil spring 34, and the annular plate portion 16 is subjected to the pressing force. When an acting force in the direction of rolling up the outer peripheral end from the lower sheet 42 is generated, the inner peripheral portion of the annular plate portion 16 with respect to the thin portion 24 is affected by the acting force. However, the circular plate portion 16 is bent so that the outer peripheral portion of the annular plate portion 16 inclines downward toward the outer peripheral edge portion, that is, the annular plate portion 16 is bent. The outer peripheral edge of
The ring plate portion 1 is kept in contact with the lower sheet 42.
The whole 6 is shaped so as to be floated from the lower seat 42 so as to have a mountain shape with the thin portion 24 as the top.

As described above, in the coil spring rubber sheet 10 of this embodiment, the coil spring 34 is used.
When a pressing force is applied from, the outer peripheral end portion of the annular plate portion 16 is kept in contact with the lower sheet 42, and the entire annular plate portion 16 has a mountain shape with the thin portion 24 as the top. In addition, since the lower seat 42 is floated from the lower seat 42, the outer peripheral end of the annular plate portion 16 may be rolled up from the lower seat 42 of the lower arm 30 in use. Can be advantageously prevented, whereby sand or pebbles between the outer peripheral ends of the annular plate portions 16 and the lower seat 42,
Invasion of foreign matter such as mud can be reliably prevented. As a result, an increase in the amount of wear of the annular plate portion 16 caused by such rubbing with a foreign matter, occurrence of cracks, damages, etc. can be effectively eliminated, and thus the service life is extended. , Which can be achieved extremely advantageously.

Further, the rubber sheet 10 of this embodiment.
In, in the upper surface of the annular plate portion 16 in which the first groove 18 is formed, continuously extends from each chevron groove portion 20 of the first groove 18 toward the outer peripheral edge portion of the annular plate portion 16, Further, the second groove 26 that opens to the side at the outer peripheral edge portion is provided, and under the condition that the second suspension 26 is used by being assembled to the rear suspension 36, the water that enters the first groove 18 will not penetrate into the second groove 26. Since the water can be smoothly discharged from the first groove 18 through the groove 26, it is advantageous that the coil spring 34 is rusted by the water accumulated in the first groove 18. Therefore, good use condition can be maintained for a long period of time.

Further, in the rubber sheet 10 of this embodiment, the first groove 18 extends toward the outer peripheral portion of the annular plate portion 16 and the chevron groove portion 20 and the inner peripheral portion thereof. Since the valley-shaped groove portions 22 that are recessed as a result have a floral pattern that are arranged so as to be alternately located in the circumferential direction,
In the coil spring 34, for example, the diameter of the coil portion 48 located at the center in the length direction is the largest, the diameter becomes smaller toward both ends thereof, and the diameter of the coil portions 48a and 48b located at both ends is the largest. Even when the coil spring 34 is configured to have a reduced tal shape, when the coil spring 34 is compressed, the second and third windings having a diameter larger than that of the coil portion 48a of the first winding located at the lowermost position. When the coil portions 48 such as the above are brought into contact with the upper surface of the annular plate portion 16 with which the coil portion 48a of the first winding comes into contact, the coil portions 48 are fitted into the first groove 18. Nothing can be advantageously avoided. As a result, it is possible to more effectively exhibit the above-mentioned prevention of the outer peripheral end portion from being rolled up from the lower sheet 42 and the excellent characteristics obtained thereby.

By the way, in the first embodiment, the first groove 18 is formed on the upper surface of the annular plate portion 16 of the rubber sheet 10. However, for example, the lower surface shape and the longitudinal sectional shape of the rubber sheet are used. As shown in FIGS. 4 and 5, the first groove 18 may be provided on the lower surface of the annular plate portion 16. In addition, here, in FIGS. 4 and 5 and FIG. 6 to be described later, by assigning the same reference numerals as those in the above-described embodiment to the portions having the same structure as in the first embodiment,
The detailed description is omitted.

That is, in the rubber sheet 50 of this embodiment, the mountain-shaped groove portions 20 and the valley-shaped groove portions 22 are alternately arranged in the circumferential direction at the radial middle portion of the lower surface of the annular plate portion 16. Further, a plurality of (six in this case) first grooves 18 having a floral pattern are formed so as to extend continuously in the circumferential direction. In addition, the first groove 18 is located radially outside the coil portion (48a) with respect to the contact portion of the first coil portion (48a) of the coil spring (34) in the annular plate portion 16. In order to locate the valley-shaped groove portion 22, it is arranged at a position distant from the taper cylinder portion 14 by a predetermined distance in the radial middle portion of the lower surface of the annular plate portion 16. (See Figure 6).

Further, in the rubber sheet 50, the lower surface of the annular plate portion 16 in which the first groove 18 is formed,
The second groove 26 is formed. Then, the second groove 26 continuously extends from each chevron-shaped groove portion 20 of the first groove 18 toward the outer peripheral edge portion of the annular plate portion 16 and, similarly to the above-described embodiment, the outer peripheral edge portion. The structure is such that the rubber sheet 50 is interposed between the lower arm 30 and the coil spring 34 and is used during use, as will be described later.
With the pressing force applied from 4, the outer peripheral end portion of the annular plate portion 16 is kept in contact with the lower sheet 42, and the entire annular plate portion 16 has a mountain shape with the thin portion 24 at the top. Even if the air is lifted from the lower seat 42 and intrudes into the space between the lower seat 42 and the lower seat 42, the intruded air can be smoothly discharged to the outside through each second groove 26. It has become.

Then, as shown in FIG. 6, similar to the above-described embodiment, such a rubber sheet 50 is fixed to the support portion 38 of the lower arm 30 by welding or the like, and the lower sheet 42 and the vehicle body at the upper end portion. It is interposed between the coil spring 34 supported by the side member 32,
As a result, the effect of suppressing the vibration transmission between the coil spring 34 and the lower arm 30 (lower seat 42) due to the elastic deformation of the rubber sheet 50 can be induced.

Also here, the coil spring 34 is provided while the rubber sheet 50 is arranged on the rear suspension 36.
The coil portion 48a of the first roll of the bottom of the rubber sheet 50
On the upper surface of the annular plate portion 16, the tapered cylindrical portion 1 located inside the thin portion 24 formed of the first groove 18 is formed.
4 is abutted (contacted) with the boundary portion with 4 to be supported, whereby the annular plate portion 16 is compressed when the coil spring 34 is compressed, as shown by the chain double-dashed line in FIG.
When a pressing force is applied from the coil spring 34 to the annular plate portion 16 to generate an acting force in a direction in which the outer peripheral end portion of the annular plate portion 16 is rolled up from the lower sheet 42,
A state in which the outer peripheral edge of the annular plate portion 16 is kept in contact with the lower sheet 42, and the entire annular plate portion 16 is lifted from the lower sheet 42 so as to have a mountain shape with the thin portion 24 at the top. It is supposed to be.

In this way, the rubber sheet 50 of this embodiment is used.
Even when there is, when the pressing force is applied from the coil spring 34, the outer peripheral end portion of the annular plate portion 16 is
From the place where the entire annular plate portion 16 is floated from the lower seat 42 so that the entire annular plate portion 16 has a mountain shape with the thin-walled portion 24 as the apex. Under the state, it may be advantageously prevented that the outer peripheral end of the annular plate part 16 is rolled up from the lower seat 42 of the lower arm 30, and the outer peripheral end of the annular plate part 16 and the lower seat 42 are prevented. It is possible to reliably prevent foreign matter such as sand, pebbles, and mud from entering into the space between them, thereby increasing the amount of wear, cracking, or damage of the annular plate portion 16 due to rubbing with such foreign matter. It is possible to effectively eliminate the occurrence of such problems, and thus, it is possible to extremely prolong the service life of the product.

Further, the rubber sheet 50 of this embodiment.
, The first groove 18 is formed on the lower surface of the annular plate portion 16 so as to extend continuously from each chevron-shaped groove portion 20 of the first groove 18 toward the outer peripheral edge portion of the annular plate portion 16. Second groove 26
Are installed in the rear suspension 36 and are used by being assembled to the rear suspension 36.
When the annular plate portion 16 is deformed by the pressing force applied by the air, the air that has entered between the lower seat 42 and the lower seat 42 can be smoothly discharged to the outside through the second grooves 26. Therefore, after the pressing force applied from the coil spring is released, the annular plate portion 16 can be smoothly and quickly returned to its original state.

In the rubber sheet 50 of this embodiment, the first groove 18 is provided on the lower surface of the annular plate portion 16, so that the first portion of the coil portion 48 of the coil spring 34 is formed. It is possible to effectively eliminate the fitting of the groove into the groove 18, and to prevent the outer peripheral end portion of the annular plate portion 16 from being rolled up from the lower sheet 42 as described above, and to obtain the excellent characteristics obtained thereby. In addition to that, the sand, pebbles, and mud in the first groove 18 can be more effectively exhibited than in the case where the first groove 18 is provided on the upper surface of the annular plate portion 16. Alternatively, the invasion and retention of foreign matter such as water can be more advantageously eliminated or suppressed, whereby the increase in the amount of wear and the occurrence of damage due to rubbing with such foreign matter can be more effectively prevented. In addition, further extension of service life can be realized effectively. By it becomes that.

The specific construction of the present invention has been described in detail above, but this is merely an example, and the present invention is not restricted by the above description.

For example, in the two embodiments described above, the first groove 18 is provided on either one of the upper surface and the lower surface of the annular plate portion 16, but it is formed on both the upper surface and the lower surface. It is also possible.

Further, the position of the first groove 18 on the upper surface and the lower surface of the annular plate portion 16 is not limited to those exemplified in the above two embodiments, and the annular plate portion is not limited. The coil portion 48 of the coil spring 34 is located closer to
It suffices if the first groove 18 is provided so as to be located on the outer side in the radial direction of a.

Further, the shape of such a first groove 18 is not limited to the flower pattern shapes exemplified in the above-mentioned two embodiments, and for example, a V-shaped chevron groove portion 20 and There is no problem even if it has a star shape in which V-shaped valley-shaped groove portions 22 are alternately arranged in the circumferential direction, or has a circular shape, an elliptical shape, a polygonal shape, or an amorphous shape. There is no.

Furthermore, in the two embodiments described above, the first groove 18 was formed so as to extend continuously in the circumferential direction of the annular plate portion 16. Of course, it is possible to form so as to extend discontinuously with respect to the direction.

Further, in the above-mentioned two embodiments, the second groove 26 is straight in the radial direction from each chevron-shaped groove portion 20 of the first groove 18 toward the outer peripheral edge portion of the annular plate portion 16. Was formed so as to extend continuously to the second groove 2
6 is formed to extend continuously from the first groove 18 toward the outer peripheral edge of the surface of the annular plate portion 16 on which the first groove 18 is formed, and to open laterally at the outer peripheral edge. If so, the arrangement form and the number of arrangements are not limited in any way.

In addition, in the above-mentioned embodiment, the present invention is
Although the specific example of the one applied to the rubber sheet for the coil spring interposed between the lower arm and the coil spring of the link type suspension has been shown, the present invention is not limited to the strut type suspension and the beam type suspension. In a suspension system in which a coil spring is arranged between a wheel and a vehicle body, it can be advantageously applied to a coil spring rubber sheet or the like used to support the coil spring. Of course.

Although not listed one by one, the present invention
It can be carried out in an embodiment in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art, and such an embodiment does not depart from the gist of the present invention.
Both are included within the scope of the present invention,
Needless to say.

[0051]

As is apparent from the above description, the rubber sheet for a coil spring according to the present invention can be used, for example, when it is used to support a coil spring forming a part of a suspension system. The pressing force applied from the coil spring can advantageously prevent the outer peripheral end from rolling up from the support member that supports the wheel-side end of the coil spring, and as a result, rubs against those foreign matters. Increased wear due to
The generation of cracks, damages, etc. can be effectively eliminated, and thus the extension of the service life can be achieved extremely advantageously.

[Brief description of drawings]

FIG. 1 is a half cutaway view showing an upper surface form of an example of a rubber sheet for a coil spring according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a vertical cross-sectional explanatory view showing an assembled state of the rubber sheet for a coil spring shown in FIG. 1 to a rear suspension.

FIG. 4 is a view corresponding to FIG. 1, showing another example of the rubber sheet for coil springs according to the present invention.

5 is a cross-sectional view taken along line VV in FIG.

FIG. 6 is a view corresponding to FIG. 3 showing an assembled state of the rubber sheet for a coil spring shown in FIG. 4 to a rear suspension.

[Explanation of symbols]

10, 50 rubber sheet 14 taper cylinder portion 16 annular plate portion 18 first groove 20 mountain groove portion 22 valley groove portion 24 thin wall portion 26 second groove 30 lower arm 32 vehicle body side member 34 coil spring 36 rear suspension 42 lower seat 48 coil

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiya Tsujida             Daihatsu 1-1 Daihatsu-cho, Ikeda City, Osaka Prefecture             Tsu Industry Co., Ltd. (72) Inventor Masataka Nasada             Daihatsu 1-1 Daihatsu-cho, Ikeda City, Osaka Prefecture             Tsu Industry Co., Ltd. (72) Inventor Hiroo Hashimoto             Daihatsu 1-1 Daihatsu-cho, Ikeda City, Osaka Prefecture             Tsu Industry Co., Ltd. (72) Inventor Hitoshi Araki             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Kazuyuki Nagata             Tokai Rubber Works, Higashi 3-chome, Komaki City, Aichi Prefecture             Business (72) Inventor Yukio Hayashi             Tokai Rubber Works, Higashi 3-chome, Komaki City, Aichi Prefecture             Business F-term (reference) 3D001 AA17 CA01 DA01 DA07                 3J059 AB12 AE01 BA01 BB01 BD01                       CA01 CC03 GA02

Claims (5)

[Claims] 1. An end portion of a coil spring is abutted,
A rubber sheet for a coil spring that supports the coil spring, wherein a first groove extending continuously or discontinuously in the circumferential direction is provided on at least one surface of the coil spring side and the opposite side thereof. A rubber sheet for a coil spring, which is formed so as to be located radially outward of a first coil portion of the coil spring that comes into contact with the rubber sheet. 2. The rubber sheet, wherein the coil spring is arranged between a wheel side member and a vehicle body side member in a vehicle suspension system, and the rubber sheet is provided between the coil spring and the wheel side member. The above-mentioned claim 1 which is inserted.
Rubber sheet for coil springs described in. 3. The surface on the side where the first groove is formed continuously extends from the first groove toward the outer peripheral edge portion of the surface, and is laterally opened at the outer peripheral edge portion. The rubber sheet for a coil spring according to claim 1 or 2, wherein a second groove is formed. 4. The first groove has a mountain-shaped groove portion that extends in a convex shape toward the outer peripheral portion of the surface on which the first groove is formed, and a valley shape that is concave toward the inner peripheral portion of the surface. 4. The extending trough-shaped groove portion is configured to have a bent form alternately arranged in the circumferential direction.
A rubber sheet for a coil spring according to any one of 1. 5. The first groove is formed only on a surface opposite to a surface with which the coil portion of the first winding located at the lowest position of the coil spring is in contact. A rubber sheet for a coil spring according to any one of 1.