JP2016223591A - Air spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air spring capable of separately adjusting characteristics of a rocking part and a rolling part of a diaphragm.SOLUTION: An air spring includes a first attachment member 2 connected to one of a vibration generating part and a vibration receiving part, a second attachment member 3 attached to the other, a cylindrical inner cylinder member 4 disposed between the first attachment member 2 and the second attachment member 3, a first diaphragm 5 having one end attached to the first attachment member 2 and the other end attached to the inner cylinder member 4, a second diaphragm 6 having one end attached to the inner cylinder member 4 and the other end attached to the second attachment member 3, and an air chamber. A cylindrical outer cylinder member 7 is attached to the outer side of the inner cylinder member 4 in such a manner of surrounding at least a part of the diaphragms. A diaphragm area of the first diaphragm 5 in a cross-sectional view along an axial direction of the diaphragm is larger than that of the second diaphragm 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air spring.

  Conventionally, as a kind of air spring used in, for example, suspensions for automobiles, anti-vibration support devices for industrial machines, cylinder devices, etc., a diaphragm formed in a cylindrical shape with rubber or the like is disposed on the upper part of the piston. There is known an air spring having a structure in which a chamber is mounted thereon and either a piston or a chamber is connected to a vibration generating part or a vibration receiving part (for example, Patent Document 1). In such an air spring, when vibration is input, relative displacement in the axial direction is generated between the piston and the chamber, and the vibration can be absorbed by the air chamber in the diaphragm.

JP 2006-144940 A

  Moreover, as an air spring used as a suspension for an automobile, in addition to the above-described air spring, a first attachment member side connected to one of a vibration generating portion and a vibration receiving portion in the diaphragm, a vibration generating portion, and There has been proposed an air spring in which a swinging portion and a rolling portion having different effective pressure receiving areas are formed on the second attachment member side connected to the other of the vibration receiving portions. However, in such an air spring, the required durability and pressure resistance may differ between the rocking portion and the rolling portion of the diaphragm, and such characteristics may not be adjusted.

  Therefore, an object of the present invention is to provide an air spring that can individually adjust the characteristics of the swinging portion and the rolling portion of the diaphragm.

The air spring of the present invention includes a first mounting member connected to one of the vibration generating unit and the vibration receiving unit, a second mounting member connected to the other of the vibration generating unit and the vibration receiving unit, and the first mounting member. And a cylindrical inner cylinder member disposed between the first mounting member and the second mounting member, and one end side is attached to the first mounting member and the other end side is attached to the inner cylindrical member. A first diaphragm, and a second diaphragm having one end side attached to the inner cylinder member and the other end side attached to the second attachment member. The first diaphragm, The second diaphragm and the inner cylinder member constitute an air chamber inside the first diaphragm, the second diaphragm and the inner cylinder member, and between the first mounting member and the second mounting member, Outside of the inner cylinder member A cylindrical outer cylinder member is attached so as to surround at least a part of the first diaphragm or the second diaphragm, and the center of the arc-shaped portion of each diaphragm in a sectional view along the axial direction is circumferential. The diaphragm area which is a portion surrounded by a closed curve formed by connecting to the first diaphragm is characterized in that the diaphragm area of the first diaphragm is larger than the diaphragm area of the second diaphragm.
According to the air spring of the present invention, the characteristics of the swinging portion and the rolling portion of the diaphragm can be adjusted separately.

Here, in the air spring of the present invention, the outer cylinder member and the inner cylinder member are coupled via a coupling portion, and the coupling portion is connected to the other end of the first diaphragm and the second diaphragm. It is preferable that it is located between the one end side edge parts.
According to this configuration, the durability of the air spring can be improved.

In the air spring of the present invention, the arc-shaped portion of the first diaphragm has a portion not surrounded by the outer cylinder member, and the arc-shaped portion of the second diaphragm is surrounded by the outer cylinder member. It is preferable.
According to this configuration, the characteristics of the oscillating part and the rolling part of the diaphragm can be adjusted sufficiently separately.

  ADVANTAGE OF THE INVENTION According to this invention, the air spring which can adjust the characteristic of the rocking | swiveling part and rolling part of a diaphragm separately can be provided.

It is sectional drawing along the axial direction which shows the air spring which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view along an axial direction showing an air spring 1 according to an embodiment of the present invention.
The air spring 1 according to the present embodiment is used, for example, in a passenger car, and is disposed at a connection portion between a tire side (vibration generating part (suspension receiving vibration from the ground)) and a vehicle body side (vibration receiving part). Thus, it is possible to prevent transmission of vibration and impact from the vibration generating unit to the vibration receiving unit.

The air spring 1 according to the present embodiment includes a first attachment member 2 connected to one of the vibration generating unit and the vibration receiving unit (in this example, the vibration receiving unit, more specifically, the vehicle body side), the vibration generating unit, It arrange | positions between the 2nd attachment member 3 connected with the other (this example vibration generation part. More specifically, the tire side) and the 1st attachment member 2 and the 2nd attachment member 3 of a vibration receiving part. A cylindrical inner cylinder member 4, a cylindrical film having elasticity, a first diaphragm 5 having one end attached to the first attachment member 2 and the other end attached to the inner cylinder member 4, and an elastic cylindrical film And a second diaphragm 6 separate from the first diaphragm 5, one end of which is attached to the inner cylinder member 4 and the other end is attached to the second attachment member 3. In the air spring 1, the first diaphragm 5, the second diaphragm 6, and the inner cylinder member 4 are inside the first diaphragm 5, the second diaphragm 6, and the inner cylinder member 4, and the first mounting member 2. An air chamber is formed between the second mounting member 3 and a cylindrical outer cylinder member 7 is attached to the outer side of the inner cylindrical member 4 so as to surround at least a part of the first diaphragm 5 or the second diaphragm 6. It has been.
In the illustrated example, the first mounting member 2, the second mounting member 3, the inner cylinder member 4, the first diaphragm 5, the second diaphragm 6, and the outer cylinder member 7 are arranged coaxially so as to have a common axis. ing. Hereinafter, this common axis is also referred to as an axis O, a direction along the axis O is referred to as an axial direction, a direction orthogonal to the axis O is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.

  The first mounting member 2 is located on one axial side (upper side in the drawing), and has a first side wall portion 21 having a circular cross section in the radial direction, and the first side wall portion 21 on the other axial side (lower side in the drawing). A second side wall part 22 which is adjacent and has a smaller outer diameter than the first side wall part 21 and has a circular cross section in the radial direction, and a vibration generating part or a vibration receiving part which is adjacent to the first side wall part 21 on one side in the axial direction. And a substantially planar tip 24 located on the other axial side of the second side wall 22. Further, the first mounting member 2 is provided on the outer peripheral side of the second side wall portion 22, is slightly shorter than the axial length of the second side wall portion 22, and has an outer diameter substantially the same as that of the first side wall portion 21. A ring 25 is provided. The stopper ring 25 can suppress excessive deformation of the first diaphragm 5, and the shape (outside of the portion of the stopper ring 25 that comes into contact with a swinging portion 51 formed by the first diaphragm 5 described later). By changing the outer diameter of the surface, the center position of the curved circular arc portion of the swinging part 51 can be adjusted, for example, in the radial direction of the air spring 1. In the present invention, it is not essential to provide the stopper ring 25, and the center position of the curved arc portion of the swinging portion 51 can be adjusted without using the stopper ring 25.

In the illustrated example, the outer diameters of the first side wall portion 21 and the second side wall portion 22 of the first mounting member 2 are substantially constant in the axial direction.
The second side wall portion 22 is attached to one end side of a first diaphragm 5 described later on the outer periphery of the other end portion in the axial direction.
If the connection part 23 of the 1st attachment member 2 can be connected with a vibration generation part or a vibration receiving part, the connection method can be made arbitrary, for example, bolt and nut fastening, pin fastening (a pin is inserted in a hole and fastening) Or the like).

  Moreover, the 1st attachment member 2, the 2nd attachment member 3 mentioned later, the inner cylinder member 4, and the outer cylinder member 7 are not specifically limited, For example, it can form with a metal.

The second mounting member 3 includes a circular side wall portion 31 in a radial cross section, a substantially planar tip portion 32 located on one axial side of the side wall portion 31 (upper side in the drawing), and the other axial direction of the side wall portion 31. It is located on the side (lower side in the figure) and includes a connecting portion 33 that connects to the vibration generating portion or the vibration receiving portion. In the illustrated example, the outer diameter of the side wall portion 31 is substantially constant in the axial direction. In addition, you may comprise the outer-diameter shape of the side wall part 31 in a taper for spring characteristic adjustment.
Moreover, the connection part 33 of the 2nd attachment member 3 can be connected arbitrarily, if it can be connected to a vibration generation part or a vibration receiving part, for example, can be connected by bolt fastening, pin fastening, etc. it can.

  In this embodiment, the first mounting member 2 and the second mounting member 3 are hollow bodies, and the spring characteristics can be adjusted by changing their internal volumes. You can also.

The inner cylinder member 4 has a cylindrical shape and is disposed between the first attachment member 2 and the second attachment member 3. In this embodiment, the inner cylinder member 4 has an inner diameter larger than the outer diameter of the second mounting member 3, and has an outer diameter smaller than the outer diameter of the first mounting member 2. Further, the inner cylinder member 4 has an axial length shorter than an axial length of an outer cylinder member 7 described later. In the illustrated example, the inner cylinder member 4 has a substantially constant inner diameter and outer diameter in the axial direction.
As will be described later, the diaphragm area of the first diaphragm 5 in the arc-shaped portion included in the swinging portion 51 formed by the first diaphragm 5 is the second included in the rolling portion 61 formed by the second diaphragm 6. If it is larger than the diaphragm area of the diaphragm 6, the inner diameter and the outer diameter of the inner cylinder member 4 can be arbitrarily set in relation to the outer diameters of the first mounting member 2 and the second mounting member 3.

  The first diaphragm 5 and the second diaphragm 6 are in the form of a tubular film having elasticity made of rubber, for example. The first diaphragm 5 is attached to the first attachment member 2 at one end side and attached to the inner cylinder member 4 at the other end side. The second diaphragm 6 has one end attached to the inner cylinder member 4 and the other end attached to the second attachment member 3. The first diaphragm 5 and the second diaphragm 6 can have a plurality of cords made of, for example, organic fibers, more specifically nylon fibers embedded therein. In addition, in the state where each diaphragm is removed from the air spring 1, the cord is, for example, an angle of 32 to 42 degrees with respect to the axis O, and the second diaphragm 6 is an angle of the first diaphragm 5 with respect to the axis O. And an angle of 25 to 32 °.

Attachment to the first attachment member 2, the inner cylinder member 4, and the second attachment member 3 on one end side and the other end side of the first diaphragm 5 and one end side and the other end side of the second diaphragm 6 is limited. Although not intended, it can be attached by caulking using the caulking ring 8.
Specifically, the first diaphragm 5 is attached to the first attachment member 2 on one end side, with the one end side of the first diaphragm 5 facing one side in the axial direction, more specifically, the first attachment member 2. Is carried out by fitting the second side wall portion 22 of the first mounting member 2 into the other end portion in the axial direction so as to cover from the outer peripheral side, and further caulking the first diaphragm 5 with the caulking ring 8. it can. Further, the second diaphragm 6 is attached to the second mounting member 3 on the other end side with the other end side of the second diaphragm 6 facing toward the one side in the axial direction, more specifically, the second mounting member 3. 2 It can be carried out by fitting the side wall portion 31 of the attachment member 3 into one end portion in the axial direction so as to cover from the outer peripheral side, and caulking the second diaphragm 6 with the caulking ring 8. Furthermore, the attachment to the inner cylinder member 4 on the other end side of the first diaphragm 5 and the one side of the second diaphragm 6 is carried out so that the end side of each diaphragm is directed to each end side in the axial direction of the inner cylinder member 4. The cylindrical member 4, more specifically, the axial end of the inner cylindrical member 4 is fitted so as to cover from the outer peripheral side, and further, the caulking ring 8 is crimped so as to sandwich the diaphragms 5 and 6. be able to.

The outer cylinder member 7 has a cylindrical shape, and is attached to the outside of the inner cylinder member 4 so as to surround at least a part of the first diaphragm 5 or the second diaphragm 6. In this embodiment, the swinging part 51 has a portion not surrounded by the outer cylinder member 7, and the rolling part 61 is surrounded by the outer cylinder member 7, more specifically, the outer cylinder member. 7 surrounds part of the first diaphragm 5 and all of the second diaphragm 6.
Moreover, the outer cylinder member 7 is not connected and fixed to either the first attachment member 2 or the second attachment member 3 in this example.

  Further, in a state where the inner cylinder member 4 is disposed inside the outer cylinder member 7, a portion of the outer cylinder member 7 on the other side in the axial direction with respect to the inner cylinder member 4 is defined as an outer cylinder member other side portion 71. When a portion overlapping the cylindrical member 4 in the radial direction and a portion on one side in the axial direction from the portion are used as the outer cylindrical member one side portion 72, in this embodiment, the inner diameter (example shown in the drawing) of the outer cylindrical member other side portion 71 is used. Then, the outer diameter is also substantially constant. Moreover, the outer cylinder member one side part 72 has a part whose inner diameter is larger than the outer cylinder member other side part 71, and the inner diameter of the part gradually increases from the other side in the axial direction toward the one side. . Furthermore, one side (one end side) in the axial direction of the outer cylinder member one side portion 72 has a flange shape. In the illustrated example, one axial direction side of the flange-shaped portion 72f is positioned on one axial direction side with respect to the inner cylinder member 4, and the shape of the flange-shaped portion 72f is adjusted (for example, the size of the inner diameter is adjusted). Accordingly, the center position of the curved circular arc portion of the swinging portion 51 formed by the first diaphragm 5 described later can be adjusted, for example, in the radial direction of the air spring 1. Further, by making one side in the axial direction of the outer cylinder member 6 into a flange shape (by providing the flange-like portion 6f), it is possible to reduce wear of the diaphragm due to the end edge of the outer cylinder member 6.

The coupling between the outer cylinder member 7 and the inner cylinder member 4 can be performed by an arbitrary method, for example, by caulking the outer cylinder member 7 with or without each diaphragm. “Without a diaphragm” means that each diaphragm between the outer cylinder member 7 and the inner cylinder member 4 is not located).
Moreover, in this embodiment, the outer cylinder member 7 and the inner cylinder member 4 can be connected via the coupling part 9 (not via the diaphragms 5 and 6). It can be located between the other end side end portion of the first diaphragm 5 and the one end side end portion of the second diaphragm 6. Specifically, the coupling portion 9 can be a screw that is inserted into the inner cylinder member 4 from the outer surface of the outer cylinder member 7 and screwed together.

In the air spring 1 of this embodiment, the first diaphragm 5 and the second diaphragm 6 have a closed curve formed by connecting the centers of the arc-shaped portions in the circumferential direction with respect to the arc-shaped portions in a sectional view along the axial direction. The diaphragm area which is the enclosed portion is larger in diaphragm area of the first diaphragm 5 than the diaphragm area of the second diaphragm 6. Further, in a state where the air spring 1 is assembled and disposed in the vertical direction (when a load is input), the first diaphragm 5 is folded back to form a swinging portion 51 including an arcuate portion, and the second diaphragm 6 Is folded back to form a rolling part 61 including an arc-shaped portion.
In other words, the radial distance Rs from the central axis O of the arc portion of the swinging portion 51 is larger than the radial distance Rr from the central axis O of the arc portion of the rolling portion 61.

In this embodiment, the arcuate portion of the first diaphragm 5 is formed in the swinging portion 51 and does not contact the first mounting member 2 or the outer cylinder member 7, and one side in the axial direction by the air pressure in the diaphragm. And a portion including a curved surface that bulges and deforms outward in the radial direction. Further, the swinging portion 51 is formed between the one end portion in the axial direction of the inner cylinder member 4 and the other end portion in the axial direction of the second side wall portion 22 of the first mounting member 2.
Further, the arc-shaped portion of the second diaphragm 6 is formed in the rolling part 61 and does not contact the second mounting member 3 or the outer cylinder member 7 and is convex to the other side in the axial direction by the air pressure in the diaphragm. It is a part including a curved surface that bulges and deforms. The rolling portion 61 is formed between the outer cylinder member other side portion 71 and the side wall portion 31 of the second mounting member 3. More specifically, the rolling part 61 extends along the outer peripheral surface of the side wall part 31 of the second mounting member 3 from one side to the other side in the axial direction, and the side wall part of the second mounting member 3. An arc-shaped portion is formed between the outer cylinder member 31 and the other side portion 71 of the outer cylinder member, and is formed extending along the inner peripheral surface of the other side portion 71 of the outer cylinder member from the other side in the axial direction to the one side. Has been.

The operation and effect of the air spring 1 of this embodiment will be described below.
In the air spring 1 of this embodiment, the outer cylinder member 7 of the diaphragm is attached to the outside of the inner cylinder member 4 by attaching the outer cylinder member 7 so as to surround at least a part of the first diaphragm 5 or the second diaphragm 6. Since the expansion of the diaphragm is limited in the portion covered with the air spring 1 when a load is applied, the spring characteristic of the air spring 1 can be adjusted by the diaphragm in relation to the outer cylinder member 7.
Further, when a load is input to the air spring 1, the first diaphragm 5 forms the swinging portion 51 and the second diaphragm 6 forms the rolling portion 61. When input, the second mounting member 3 on the rolling part 61 side having a relatively small diaphragm area of the second diaphragm 6 is relatively easy to compress the air chamber formed by the diaphragm (relative). The spring is soft. In addition, the first mounting member 2 on the side of the swinging part 51 having a relatively large diaphragm area of the first diaphragm 5 is relatively difficult to compress the air chamber (relatively hard spring). Therefore, the rolling part 61 can mainly absorb the vibration in the direction that causes the axial displacement relative to the air spring 1, and the swinging part 51 can be deformed by being twisted with respect to the air spring 1. Can absorb vibrations in various directions.

By the way, in the conventional air spring in which the swinging portion and the rolling portion are formed on the first mounting member side and the second mounting member side in the diaphragm, it is desired at the swinging portion and the rolling portion of the diaphragm. The durability and pressure resistance may vary, and such characteristics may not be adjusted.
On the other hand, the air spring 1 of this embodiment has a first diaphragm 5 attached at one end side to the first attachment member 2 and attached at the other end side to the inner cylinder member 4, and an end side attached to the inner cylinder member 4. Since the diaphragm of the air spring 1 of this embodiment is divided by providing the second diaphragm 6 attached to the second attachment member 3 on the other end side, the durability and pressure resistance required for the diaphragms 5 and 6 are divided. It is possible to adjust characteristics such as sex. Further, the spring characteristics of the swinging part 51 and the rolling part 61 can be sufficiently adjusted.

  Further, in the air spring 1 of the present invention, as in this embodiment, the outer cylinder member 7 and the inner cylinder member 4 are coupled via the coupling portion 9, and the coupling portion 9 is the other end side of the first diaphragm 5. It is preferable to be located between the end portion and the one end side end portion of the second diaphragm 6. When an integral diaphragm is used like a conventional air spring, the outer cylinder member and the inner cylinder member are connected by caulking the outer cylinder member to the inner cylinder member with the diaphragm interposed therebetween. However, in the air spring 1 of this embodiment, the outer cylinder member 7 and the inner cylinder member 4 that are located between the other end side end portion of the first diaphragm 5 and the one end side end portion of the second diaphragm 6 Since the outer cylinder member 7 and the inner cylinder member 4 can be directly connected by connecting them with the coupling portion 9, the connection can be strengthened. Therefore, the durability of the air spring 1 can be improved.

  Furthermore, in the air spring 1 of the present invention, as in this embodiment, the arcuate portion of the first diaphragm 5 has a portion not surrounded by the outer cylinder member 7, and the arcuate portion of the second diaphragm 6 is outside. It is preferable that the cylinder member 7 is surrounded. By making the arrangement relationship between the diaphragms 5 and 6 and the outer cylinder member 7 as described above, the characteristics such as the spring characteristics of the rolling part 61 and the swinging part 51 can be adjusted sufficiently separately. . In the illustrated example, the rolling part 61 is also surrounded by the outer cylinder member 7.

  The plurality of cords embedded in the first diaphragm 5 and the second diaphragm 6 have an angle of 32 ° to 42 ° with respect to the axis O in a state in which each diaphragm is removed from the air spring 1. The second diaphragm 6 is preferably smaller than the angle of the first diaphragm 5 and an angle of 25 to 32 °. By setting the cord of the first diaphragm 5 to an angle of 32 to 42 °, the first diaphragm 5 is less likely to bulge radially outward in an appropriate range, so that the spring of the swinging portion 51 can be made relatively stiff. it can. Further, by setting the cord of the second diaphragm 6 to be smaller than the angle of the first diaphragm 5 and an angle of 25 to 32 °, the second diaphragm 6 is likely to bulge radially outward in an appropriate range. The spring of the rolling part 61 can be made relatively soft.

  As mentioned above, although embodiment of this invention was described with reference to drawings, the air spring of this invention is not limited to the said example, A change can be added suitably.

  ADVANTAGE OF THE INVENTION According to this invention, the air spring which can adjust the characteristic of the rocking | swiveling part and rolling part of a diaphragm separately can be provided.

1: air spring, 2: first mounting member, 21: first side wall portion, 22: second side wall portion, 23: coupling portion, 24: tip portion, 25: stopper ring, 3: second mounting member, 31: Side wall part, 32: tip part, 33: connecting part, 4: inner cylinder member, 5: first diaphragm, 51: swinging part, 6: second diaphragm, 61: rolling part, 7: outer cylinder member, 71 : Outer cylinder member other side part, 72: outer cylinder member one side part, 72f: flange-like part, 8: caulking, 9: coupling part, Rs: radial distance, Rr: radial distance, O: axis

Claims (3)

A first attachment member coupled to one of the vibration generator and the vibration receiver;
A second attachment member coupled to the other of the vibration generating portion and the vibration receiving portion;
A cylindrical inner cylinder member disposed between the first attachment member and the second attachment member;
A first diaphragm having an elastic tubular membrane shape, one end of which is attached to the first attachment member and the other end is attached to the inner tubular member;
A cylindrical membrane having elasticity, one end side is attached to the inner cylinder member, the other end side is provided with a second diaphragm attached to the second attachment member,
The first diaphragm, the second diaphragm, and the inner cylinder member are inside the first diaphragm, the second diaphragm, and the inner cylinder member, and between the first mounting member and the second mounting member, Make up the room,
A cylindrical outer cylinder member is attached to the outside of the inner cylinder member so as to surround at least a part of the first diaphragm or the second diaphragm,
The diaphragm area, which is a portion surrounded by a closed curve formed by connecting the centers of arc-shaped portions in a cross-sectional view along the axial direction of each diaphragm in the circumferential direction, is greater than the diaphragm area of the second diaphragm. An air spring characterized in that the diaphragm area of the diaphragm is large. The outer cylinder member and the inner cylinder member are connected via a coupling portion,
2. The air spring according to claim 1, wherein the coupling portion is located between the other end side end portion of the first diaphragm and the one end side end portion of the second diaphragm.   The arc-shaped portion of the first diaphragm has a portion not surrounded by the outer cylindrical member, and the arc-shaped portion of the second diaphragm is surrounded by the outer cylindrical member. The air spring described.

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