JP2019007496A - Strut mount - Google Patents

Abstract

To provide a strut mount which achieves improvement of steering stability and reduction of road noise while inhibiting deterioration of riding quality.SOLUTION: A strut mount 10 includes: an inner cylinder member 11 in which an upper end part of a rod 31 of a shock absorber is inserted to be fixed; an outer cylinder member 12 which encloses the inner cylinder member 11 from the radial outer side; and body rubber 13 which connects the inner cylinder member 11 with the outer cylinder member 12. Cords 22 to 25 formed by a synthetic resin material or metal material and connecting the inner cylinder member 11 to the outer cylinder member 12 are disposed between the inner cylinder member 11 and the outer cylinder member 12. At least parts of the cords 22 to 25 extend linearly between the inner cylinder member 11 and the outer cylinder member 12 in a plan view viewed in a vertical direction. The cords 22 to 25 are embedded in the body rubber 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a strut mount.

Conventionally, for example, as shown in Patent Document 1 below, an inner cylinder member to which an upper end portion of a rod of a shock absorber is inserted and fixed, an outer cylinder member that surrounds the inner cylinder member from the outside in the radial direction, and an inner cylinder 2. Description of the Related Art A strut mount including a main body rubber that connects a member and an outer cylinder member is known.
This type of strut mount generally rides when the static spring constant in the vertical direction and the static spring constant in the direction in which the respective central axes of the inner cylinder member and the outer cylinder member are inclined with respect to each other (hereinafter referred to as the prying direction) are high. It is known that the comfort is deteriorated, the steering stability is lowered when the lateral static spring constant is low, and the road noise is increased when the lateral dynamic spring constant is high.

JP 2011-183886 A

However, rubber material is generally a material with a high dynamic magnification (dynamic spring constant / static spring constant), so the static spring constant is increased to improve steering stability and the dynamic spring constant is reduced. Therefore, there is a problem that it is difficult to achieve both reduction of road noise.
On the other hand, when the material of the rubber material forming the main rubber is selected and the static spring constant is increased, the driving stability is improved but the ride comfort is deteriorated.

  The present invention has been made in view of the above-described circumstances, and provides a strut mount capable of improving both steering stability and reducing road noise while suppressing deterioration in ride comfort. Objective.

In order to solve the above problems, the present invention proposes the following means.
A strut mount according to the present invention includes an inner cylinder member that is fixed by inserting an upper end portion of a shock absorber rod inside, an outer cylinder member that surrounds the inner cylinder member from outside in a radial direction, and the inner cylinder member. A strut mount comprising a main body rubber that connects the outer cylinder member, and is formed of a synthetic resin material or a metal material between the inner cylinder member and the outer cylinder member, and the inner cylinder member And a cord connecting the outer cylinder member is disposed, and at least a part of the cord is linearly formed between the inner cylinder member and the outer cylinder member in a plan view as viewed from above and below. The cord extends and is embedded in the main rubber.

According to this invention, since the cord is disposed between the inner cylinder member and the outer cylinder member, the cord extends linearly between the inner cylinder member and the outer cylinder member in the plan view. When the inner cylinder member and the outer cylinder member are relatively displaced in a direction (hereinafter referred to as a cord laying direction), an axial tensile force is generated in the cord. Therefore, when the inner cylinder member and the outer cylinder member are relatively displaced in the cord erection direction, the mechanical characteristics of the cord, not the main rubber, are predominantly expressed.
Thereby, it becomes possible to increase the static spring constant when the inner cylinder member and the outer cylinder member are relatively displaced in the cord laying direction, and the steering stability can be improved.
In addition, since the cord is made of a synthetic resin material or a metal material, the dynamic magnification of the cord is lower than the dynamic magnification of the main rubber, so the inner cylinder member and the outer cylinder member are relatively displaced in the cord erection direction. It is possible to keep the dynamic spring constant low when doing so, and road noise can be reduced.
On the other hand, when the inner cylinder member and the outer cylinder member are relatively displaced in directions in which their respective central axes are inclined with respect to each other (hereinafter referred to as a prying direction), or when they are relatively displaced in the vertical direction, Since the direction intersects the cord erection direction, it is difficult for the cord to be pulled in the axial direction. Therefore, when the inner cylinder member and the outer cylinder member are relatively displaced in the twisting direction or the vertical direction, the mechanical characteristics of the main rubber, not the cord, are predominantly expressed. This makes it possible to keep the static spring constant low when the inner cylinder member and the outer cylinder member are relatively displaced in the twisting direction or the vertical direction. For example, smooth vertical sliding of the rod of the shock absorber is possible. The movement is ensured and the deterioration of ride comfort can be prevented.
Further, since the cord is embedded in the main body rubber, the durability of the cord can be reliably ensured.

  Here, the said code | cord | chord may be separately arrange | positioned by the both sides which sandwich the said inner cylinder member by planar view seen from the up-down direction.

  In this case, since the cords are separately arranged on both sides of the inner cylinder member in the plan view, the above-described effects can be achieved against vibrations in both directions in the cord laying direction.

  The outer cylinder member includes an outer shell cylinder and a fitting cylinder fitted inside the outer shell cylinder. The fitting cylinder projects in the vertical direction and is seen from the vertical direction. When viewed from above, a pair of support protrusions that are opposed to each other across the inner cylinder member are disposed, and the cord is disposed on an outer peripheral surface of the surface of the support protrusion that faces the opposite side of the inner cylinder member. It may be wound in the circumferential direction.

  In this case, since the cord is wound around the outer peripheral surface of the support protrusion disposed on the fitting cylinder in the circumferential direction, the cord is fixed to the support protrusion and the fitting cylinder, and then these are integrated with each other. It is possible to fit inside the outer shell cylinder, and this strut mount can be easily formed.

  Further, the inner cylindrical member is formed with a pair of locking projections that project in a direction intersecting opposite directions in which the pair of support projections face each other in a plan view as viewed from above and below, The cord is formed in an endless shape, and extends separately from both circumferential end portions of any one of the pair of support protrusions toward the pair of locking protrusions. Of the surface, it is wound around the opposite surface facing the other side of the pair of support protrusions in the vertical direction, and is wound twice around the outer peripheral surface of either of the pair of support protrusions Also good.

  In this case, the inner cylinder member and the outer cylinder member can be reliably connected by the cord.

  According to the present invention, it is possible to improve both driving stability and reduce road noise while suppressing deterioration in riding comfort.

It is a longitudinal cross-sectional view of the strut mount which concerns on embodiment of this invention. It is AA arrow sectional drawing of the strut mount shown in FIG.

Hereinafter, an embodiment of a strut mount according to the present invention will be described with reference to FIGS. 1 and 2.
The strut mount 10 elastically supports a strut type suspension mechanism disposed between a vehicle body panel 20 located on the upper side and a wheel (not shown) located on the lower side, and is attached to the vehicle body panel 20. The strut suspension mechanism includes a cylinder (not shown) extending in the vertical direction and a shock absorber having a rod 31 extending in the vertical direction and protruding upward from the cylinder.
The vehicle body panel 20 is formed in a bottomed cylindrical shape having an annular bottom. The strut mount 10 is fitted inside the vehicle body panel 20. The rod 31 is disposed through the vehicle body panel 20 and the strut mount 10 in the vertical direction.
A lid fitting 21 that covers the upper end opening of the vehicle body panel 20 is attached to the vehicle body panel 20. The lid 21 is formed with an insertion hole 21a through which the upper end of the rod 31 is inserted.

  The strut mount 10 includes an inner cylinder member 11 to which an upper end portion of a shock absorber rod 31 is inserted and fixed, an outer cylinder member 12 that surrounds the inner cylinder member 11 from the outside in the radial direction, an inner cylinder member 11, And a main body rubber 13 for connecting the outer cylinder member 12. The central axis of each of the inner cylinder member 11 and the outer cylinder member 12 extends in the vertical direction and is disposed coaxially with the common axis. Hereinafter, this common axis is referred to as a central axis O.

The upper end portion of the rod 31 is fitted inside the inner cylinder member 11. A male thread portion is formed at the upper end portion of the rod 31. A nut 32 is screwed into a portion of the upper end portion of the rod 31 that protrudes upward from the inner cylinder member 11, whereby the upper end portion of the rod 31 is fixed to the strut mount 10.
The outer cylinder member 12 includes an outer cylinder 14 and a fitting cylinder 15 fitted inside the outer cylinder 14.

The outer peripheral surface of the outer shell cylinder 14 is in contact with the inner peripheral surface of the vehicle body panel 20. The upper end portion of the outer shell cylinder 14 protrudes upward from the upper end opening portion of the vehicle body panel 20.
The fitting cylinder 15 is provided with a pair of support protrusions 16 that protrude upward and face each other across the inner cylinder member 11 in a plan view as viewed from above and below. In the illustrated example, the pair of support protrusions 16 oppose each other with the inner cylinder member 11 sandwiched in the radial direction. Note that the vertical positions of the support protrusion 16 and the inner cylinder member 11 may be different from each other so that the support protrusion 16 and the inner cylinder member 11 do not face each other in the radial direction.

  The support protrusion 16 is disposed at the upper end opening edge of the fitting cylinder 15. The support protrusion 16 is formed integrally with the fitting cylinder 15. The thicknesses of the support protrusion 16 and the fitting cylinder 15 in the radial direction are equal to each other. Of the surface of the support protrusion 16, the inner peripheral surface facing the inner cylinder member 11, that is, the inner side in the radial direction, is connected to the inner peripheral surface of the fitting cylinder 15 without a step. Of the surface of the support protrusion 16, the outer peripheral surface facing the outer side of the inner cylinder member 11, that is, the outer side in the radial direction, and the outer peripheral surface of the fitting cylinder 15 are in contact with the inner peripheral surface of the outer shell cylinder 14. . The support protrusion 16 and the fitting cylinder 15 are embedded in the main rubber 13 over the entire area excluding the outer peripheral surface. A straight line connecting the center portions in the circumferential direction of each of the pair of support protrusions 16 facing each other in a plan view viewed from the top and bottom direction passes through the central axis O. The circumferential length of the support protrusion 16 is slightly smaller than the outer diameter of the inner cylinder member 11. Two sets of the pair of support protrusions 16 are arranged. Four support protrusions 16 are arranged at equal intervals in the circumferential direction.

  A locking groove 16a that extends continuously over the entire circumference is formed in the lower part of the outer peripheral surface of each support protrusion 16. The groove bottom surface of the locking groove 16a is smoothly connected to the peripheral end surface of the support protrusion 16 without a step through a curved surface portion without interposing a corner portion. The locking groove 16 a is located at the center in the vertical direction of the outer shell cylinder 14. The upper end portion of the support protrusion 16 is located below the upper end portion of the outer shell cylinder 14, and the lower end portion of the fitting cylinder 15 is located above the lower end portion of the outer shell cylinder 14. The vertical distance between the upper end portion of the support protrusion 16 and the upper end portion of the outer shell cylinder 14 is longer than the vertical distance between the lower end portion of the fitting cylinder 15 and the lower end portion of the outer shell cylinder 14. It has become.

  The inner cylinder member 11 is formed with a pair of locking projections 17 protruding separately from each other in the direction intersecting the opposing direction in which the pair of support projections 16 face each other when viewed from the vertical direction. In the illustrated example, the locking protrusion 17 protrudes in an orthogonal direction orthogonal to the facing direction when viewed from the vertical direction. The locking projection 17 is formed on a portion of the outer peripheral surface of the inner cylinder member 11 where a parallel line parallel to the straight line circumscribes when viewed in the vertical direction. The locking projection 17 is formed in a cylindrical shape having a central axis extending in the radial direction. The vertical positions of the locking projection 17 and the locking groove 16a are equal to each other. Two sets of the pair of locking projections 17 are arranged. Four locking protrusions 17 are arranged at equal intervals in the circumferential direction.

  The main rubber 13 is formed in a cylindrical shape whose outer peripheral surface is connected to the inner peripheral surface of the outer cylindrical member 12 and whose inner peripheral surface is connected to the outer peripheral surface of the inner cylindrical member 11. The main rubber 13 is vulcanized and bonded to the outer cylinder member 12 and the inner cylinder member 11. A plurality of annular grooves 13 a extending continuously over the entire circumference are formed at both ends of the upper and lower ends of the main rubber 13 at intervals in the radial direction. Opening edges at both ends in the vertical direction of the main rubber 13 are in contact with the bottom of the vehicle body panel 20 and the lid fitting 21 over almost the entire area except the inner surface of the annular groove 13a.

  In the present embodiment, the cords 22 and 23 are formed of a synthetic resin material or a metal material between the inner cylinder member 11 and the outer cylinder member 12 and connect the inner cylinder member 11 and the outer cylinder member 12. , 24, 25 are arranged. At least a part of the cords 22 to 25 extends linearly between the inner cylinder member 11 and the outer cylinder member 12 in a plan view as viewed from the up and down direction. The cords 22 to 25 are made of a material having a lower dynamic magnification than the material forming the main rubber 13. The cords 22 to 25 are made of, for example, nylon, aramid, steel, or the like. The cords 22 to 25 are embedded in the main rubber 13.

  The cords 22 to 25 are individually disposed on both sides of the inner cylinder member 11 in a plan view as viewed from the top and bottom. Four cords 22 to 25 are arranged at equal intervals in the circumferential direction. One cord 22-25 is connected to one of a pair of support protrusions 16 facing each other in the facing direction, and in a direction orthogonal to the facing direction among the four locking protrusions 17. It connects with both of a pair of latching protrusions 17 which protrude separately.

In the illustrated example, the cords 22 to 25 are formed in an endless shape, and are wound around the outer peripheral surface of the support protrusion 16 in a double manner.
Specifically, each of the cords 22 to 25 includes the horizontal winding portion 33 wound in the circumferential direction on the outer peripheral surface of any one of the pair of support protrusions 16 facing each other in the facing direction, and the plane. From the both ends in the circumferential direction of the laterally wound portion 33 toward the pair of locking projections 17 that protrude separately in the direction orthogonal to the opposing direction as viewed from the straight line without crossing each other in the plan view A pair of upper and lower extending bodies having a connecting portion 34 extending in a shape, and the ends of the connecting portions 34 in the extending bodies facing each other in the vertical direction are locked to each other. Of the surfaces of the protrusions 17, the structure is connected to the opposite surface facing the other side of the pair of support protrusions 16 via a vertical winding portion 35 wound in the vertical direction.

Among the four cords 22 to 25, the pair of locking protrusions 17 protruding separately in the direction orthogonal to the opposing direction in the plan view sandwich the inner cylinder member 11 in the plan view as viewed from the top and bottom. Two cords 22 to 25 arranged separately on both sides and arranged in the facing direction are connected. The protrusion height of the locking protrusion 17 from the outer peripheral surface of the inner cylinder member 11 is twice or more the outer diameter of the cords 22 to 25.
The horizontal winding portion 33 of each cord 22 to 25 is disposed in the locking groove 16 a of the support protrusion 16. The depth of the locking groove 16a is not less than the outer diameter of the cords 22-25. The groove width of the locking groove 16a is at least twice the outer diameter of the cords 22-25. Of the cords 22 to 25, the connecting portion between the horizontal winding portion 33 and the connecting portion 34 is in contact with the connecting portion between the groove bottom surface of the locking groove 16 a and the peripheral end surface of the support protrusion 16.

The strut mount 10 configured as described above is formed as follows.
First, the cords 22 to 25 are integrally wound around the locking projection 17 of the inner cylinder member 11 and the support projection 16 of the outer cylinder member 12 in a state where a tensile force is applied. 11, the support protrusion 16, and the fitting cylinder 15 are connected to each other, and these are integrally fitted into the outer shell cylinder 14 of the outer cylinder member 12. Then, the unvulcanized rubber is injected between the inner cylinder member 11 and the outer cylinder member 12, and the main rubber 13 is vulcanized to obtain the strut mount 10.

  As described above, according to the strut mount 10 according to the present embodiment, since the cords 22 to 25 are disposed between the inner cylinder member 11 and the outer cylinder member 12, the inner cylinder member 11 in the plan view. When the inner cylinder member 11 and the outer cylinder member 12 are relatively displaced in a direction in which the cords 22 to 25 extend linearly between the outer cylinder member 12 and the outer cylinder member 12 (hereinafter referred to as a cord erection direction) The axial tensile force is generated at 22-25. Therefore, when the inner cylinder member 11 and the outer cylinder member 12 are relatively displaced in the cord erection direction, the mechanical characteristics of the cords 22 to 25 instead of the main body rubber 13 are predominantly expressed.

Thereby, it becomes possible to increase the static spring constant when the inner cylinder member 11 and the outer cylinder member 12 are relatively displaced in the cord laying direction, and the steering stability can be improved.
Further, since the cords 22 to 25 are made of a synthetic resin material or a metal material, the dynamic magnification of the cords 22 to 25 is lower than the dynamic magnification of the main rubber 13, so that the inner cylinder member 11 and the outer cylinder member 12. It becomes possible to suppress the dynamic spring constant when the is displaced relatively in the cord erection direction, and it is possible to reduce road noise.

  On the other hand, when the inner cylinder member 11 and the outer cylinder member 12 are relatively displaced in directions in which their respective central axes are inclined with respect to each other (hereinafter referred to as a prying direction), or when they are relatively displaced in the vertical direction, the prying direction And since the up-and-down direction intersects with the cord erection direction, the tensile force in the axial direction is hardly generated in the cords 22 to 25. Therefore, when the inner cylinder member 11 and the outer cylinder member 12 are relatively displaced in the twisting direction or the vertical direction, the mechanical characteristics of the main rubber 13 are dominantly expressed instead of the cords 22 to 25. This makes it possible to keep the static spring constant low when the inner cylinder member 11 and the outer cylinder member 12 are relatively displaced in the twisting direction or the vertical direction. For example, the smoothness of the rod 31 of the shock absorber can be reduced. Smooth vertical sliding is ensured, and deterioration of ride comfort can be prevented.

Moreover, since the cords 22-25 are embed | buried in the main body rubber 13, the durability of the cords 22-25 can be ensured reliably.
In addition, since the cords 22 to 25 are separately provided on both sides of the inner cylinder member 11 in the plan view, the above-described effects can be achieved against vibrations in both directions in the cord erection direction. .
Further, since the cords 22 to 25 are wound around the outer peripheral surface of the support projection 16 disposed in the fitting cylinder 15 in the circumferential direction, the cords 22 to 25 are attached to the support projection 16 and the fitting cylinder 15. After being fixed, these can be integrally fitted inside the outer shell 14 and the strut mount 10 can be easily formed.
Further, as described above, the cords 22 to 25 have a configuration in which the pair of upper and lower extended bodies are connected via the vertical winding portion 35. The cylindrical member 12 can be reliably connected.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the above-described embodiment, the configuration including the four cords 22 to 25 is shown, but the configuration including three or less cords or the configuration including five or more cords may be adopted.
Instead of the embodiment, a linear cord having both ends is adopted, and both end portions in the axial direction of the cord are attached to the outer peripheral surface of the inner cylindrical member 11 and the inner peripheral surface of the outer cylindrical member 12, for example, by bonding or the like. You may change suitably, such as connecting each separately.
In the said embodiment, although each connection part 34 in one said extending body showed the structure which does not cross | intersect in the said planar view, you may make it mutually cross | intersect in the said planar view.

In the above-described embodiment, the outer cylinder member 12 includes the outer shell cylinder 14, the fitting cylinder 15, and the support protrusion 16. However, the outer cylinder member 12 includes at least one of the outer shell cylinder 14 and the fitting cylinder 15. You may change suitably, such as employ | adopting.
In the embodiment, the configuration in which the support protrusion 16 protrudes upward from the fitting cylinder 15 is shown, but a configuration in which the support protrusion 16 protrudes downward from the fitting cylinder 15 may be adopted.
In the embodiment, the locking groove 16a is formed in the support protrusion 16, but the support protrusion 16 or the outer cylinder member 12 that does not have the locking groove 16a may be employed.

In the said embodiment, although the inner cylinder member 11 showed the structure provided with the latching protrusion 17, you may employ | adopt the inner cylinder member 11 which does not have the latching protrusion 17. FIG.
In the said embodiment, although the latching protrusion 17 was formed in the column shape and the cords 22-25 showed the structure wound around the outer peripheral surface of the latching protrusion 17, a hole was formed in the latching protrusion, You may change suitably, such as employ | adopting the structure which inserts and fixes the codes 22-25 in this hole.
In the above-described embodiment, the vertical positions of the locking protrusion 17 and the locking groove 16a are equal to each other. However, the vertical positions of the locking protrusion 17 and the locking groove 16a may be different from each other. Good.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 10 Strut mount 11 Inner cylinder member 12 Outer cylinder member 13 Main body rubber 14 Outer shell cylinder 15 Fitting cylinder 16 Supporting protrusion 17 Locking protrusion 22, 23, 24, 25 Code 31 Rod

Claims (4)

An inner cylinder member in which the upper end of the shock absorber rod is inserted and fixed inside;
An outer cylinder member surrounding the inner cylinder member from the outside in the radial direction;
A strut mount comprising a main body rubber connecting the inner cylinder member and the outer cylinder member,
Between the inner cylinder member and the outer cylinder member is formed of a synthetic resin material or a metal material, and a cord connecting the inner cylinder member and the outer cylinder member is disposed,
At least a part of the cord extends in a straight line between the inner cylinder member and the outer cylinder member in a plan view as viewed from above and below,
The strut mount, wherein the cord is embedded in the main rubber.   2. The strut mount according to claim 1, wherein the cord is disposed separately on both sides sandwiching the inner cylinder member in a plan view as viewed from above and below. The outer cylinder member includes an outer cylinder, and a fitting cylinder fitted inside the outer cylinder,
The fitting cylinder is provided with a pair of support protrusions that protrude in the vertical direction and face each other across the inner cylinder member in a plan view as viewed from the vertical direction.
3. The strut mount according to claim 2, wherein the cord is wound in a circumferential direction on an outer peripheral surface facing the opposite side of the inner cylindrical member of the surface of the support protrusion. The inner cylinder member is formed with a pair of locking projections that project separately in a direction intersecting a facing direction in which the pair of support projections face each other in a plan view as viewed from above and below,
The cord is formed in an endless shape, and extends separately from both ends in the circumferential direction of any one of the pair of support protrusions toward the pair of locking protrusions, and the locking protrusions Of the pair of support protrusions, and is wound around the opposite surface facing the other side in the vertical direction, and is double-wrapped around the outer peripheral surface of one of the pair of support protrusions. The strut mount according to claim 3, wherein the strut mount is provided.

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