JP2013167315A - Suspension device, suspension support and damping member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension device which is easy in assembling while suppressing an influence imparted to a spring characteristic.SOLUTION: A suspension device 1 comprises: a cylinder 10; a piston which partitions the inside of the cylinder 10 into two oil chambers and is slidably arranged in the cylinder 10; and a piston rod 20 which supports the piston and is protruded to the outside from one end of the cylinder 10. Furthermore, the suspension device 1 comprises: a washer arranged at the outer periphery of the piston rod 20 which is protruded from the cylinder 10; a bracket member surrounding the outer periphery of the washer; and mount rubber arranged at the circumference of the piston rod 20 between the washer and the bracket member. The mount rubber is one annular member which is cut at one portion in the circumferential direction.

Description

  The present invention relates to a suspension device, a suspension support, and a buffer member.

  In the damper (suspension device), a suspension support is provided around the upper end portion of the piston rod protruding from the damper tube in order to suppress transmission of vibration from the wheel side to the vehicle body side. For example, the suspension support described in Patent Document 1 is configured as follows. That is, the suspension support includes an annular elastic member that is interposed between the inner metal fitting (inner member) and the outer metal fitting (outer member). And an inner metal fitting is provided with a flange part, an outer metal fitting is provided with a cylinder part and the upper side wall part and lower wall part which clamp an elastic member in a center line direction in the center line direction both ends. The elastic member includes an upper elastic portion held between the upper surface of the flange portion and the lower surface of the upper side wall portion, and a lower portion held between the lower surface of the flange portion and the upper surface of the lower side wall portion. It consists of a side elastic part and an annular vertical wall part that connects the two, and the upper elastic part and the lower elastic part are molded separately from foamed urethane and are assembled together between the inner metal fitting and the outer metal fitting. Is disclosed.

JP 2008-174155 A

By the way, if the buffer member interposed between the inner member and the outer member is formed of, for example, two members, the assembly work becomes complicated. In addition, when the buffer member is formed as one annular member, for example, the inner member is fitted inside the buffer member while the buffer member is being rolled, which may affect the spring characteristics of the buffer member.
An object of the present invention is to provide a suspension device that can be easily assembled while suppressing the influence on spring characteristics.

  For this purpose, the present invention provides a cylinder that contains oil therein, a piston that divides the inside of the cylinder into two oil chambers and that is slidably disposed inside the cylinder, and the piston. A piston rod that supports and protrudes out of the cylinder from one end of the cylinder, an inner member provided on an outer periphery of the piston rod protruding from the cylinder, an outer member surrounding the outer periphery of the inner member, and the inner An elastic member which is an annular member provided between the member and the outer member and around the piston rod, and the elastic member is divided at one place in the annular circumferential direction. It is the suspension device characterized by being.

Here, the elastic member may be divided in the circumferential direction by a circular section extending in the radial direction.
Moreover, the said elastic member is good for the annular outer peripheral side part perimeter to be in contact with the inner periphery of the said outer side member.
In addition, when the elastic member is provided between at least the inner member and the outer member and around the piston rod, the circumferential direction is opposed to the annular portion that is divided in the circumferential direction. It is preferable that the two ends of the are in contact with each other.
Alternatively, the elastic member may be compressed by sandwiching both ends of the annular center line direction between the outer members.

  From another point of view, the present invention relates to an inner member provided on the outer periphery of the piston rod protruding from the cylinder of the shock absorber, an outer member surrounding the outer periphery of the inner member, and between the inner member and the outer member. And an elastic member that is an annular member provided around the piston rod, and the elastic member is one member that is divided at one place in the annular circumferential direction. Support.

  From another viewpoint, the present invention is provided around the piston rod between the inner member provided on the outer periphery of the piston rod protruding from the piston of the shock absorber and the outer member surrounding the outer periphery of the inner member. An annular inner circumferential groove that extends in the annular circumferential direction on the inner circumferential surface and holds the inner member, and a dividing portion that divides one place in the circumferential direction are formed. This is a shock-absorbing member.

  According to the present invention, it is possible to provide a suspension device that can be easily assembled while suppressing the effect on spring characteristics.

It is a figure which shows schematic structure of a suspension apparatus. It is a figure for demonstrating the expansion-contraction state of a suspension apparatus. It is a figure for demonstrating a suspension support. It is a figure for demonstrating a mount rubber. It is the figure which showed the mount rubber of the comparative example. It is a figure explaining the modification of a mount rubber.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
<Suspension device 1>
FIG. 1 is a diagram showing a schematic configuration of the suspension device 1.
As shown in FIG. 1, the suspension device 1 includes a cylinder 10 including a damping device (not shown), a piston rod 20 that supports a piston (not shown) housed in the cylinder 10, and the piston rod 20. And a spring 30 disposed on the outside of the. The piston rod 20 is a cylindrical member, and a piston is attached to one end side in the center line direction of the cylinder, and a nut 21 is attached to the other end side in the center line direction. Hereinafter, the center line direction of the cylinder of the piston rod 20 may be simply referred to as “center line direction”.

  The suspension device 1 is attached to the outer periphery of the cylinder 10 to support the lower end portion of the spring 30 and the upper end of the spring 30 attached to the outer periphery on the other end side in the center line direction of the piston rod 20. And an upper spring holding portion 77a (described later) for supporting the portion. A lower seat rubber 35 is interposed between the lower end portion of the spring 30 and the lower spring seat 31, and an upper seat rubber 36 is interposed between the upper end portion of the spring 30 and an upper spring holding portion 77a (described later). Yes.

  The suspension device 1 includes a wheel side mounting portion 40 provided at a lower portion of the cylinder 10. The suspension device 1 also includes a bump rubber 41 that is press-fitted into the outer periphery of the piston rod 20 protruding from the cylinder 10, and a bump rubber cup 42 that is disposed on the outer periphery of the bump rubber 41. The illustrated bump rubber 41 is formed such that the outer diameter gradually decreases from one end side (vehicle body side) to the other end side (wheel side) in the center line direction. In addition, the suspension device 1 includes a bump stopper cap 43 attached to a sliding portion of the piston rod 20 in the cylinder 10.

The suspension device 1 has an upper end mounted on the outer periphery of the bump rubber cup 42 and a lower end mounted on the lower spring seat 31, and a bellows-like dust cover 50 covering the outer periphery of the cylinder 10 and the piston rod 20 therebetween. It has. The lower end of the dust cover 50 is fastened to the lower spring seat 31 with, for example, a tightening ring (not shown) and screws.
Further, the suspension device 1 includes a suspension support 60 that is arranged in the vertical direction on the upper end side of the piston rod 20 and elastically connects the piston rod 20 to the vehicle body. The suspension support 60 is attached to the vehicle body by bolts 33.

<Extension state of suspension device 1>
FIG. 2 is a view for explaining the stretched state of the suspension device 1.
2A is a view showing a contracted state in which the length of the piston rod 20 protruding from the cylinder 10 is the shortest, and FIG. 2B is a length of the piston rod 20 protruding from the cylinder 10. It is a figure which shows the elongation state from which becomes the longest.
As shown in FIG. 2A, when the piston rod 20 moves to one end side in the center line direction with respect to the cylinder 10 (downward in FIG. 2A), the damping device built in the cylinder 10 (Not shown) generates a damping force during the compression stroke.

  On the other hand, as shown in FIG. 2B, when the piston rod 20 moves to the other end side in the center line direction with respect to the cylinder 10 (upward in FIG. 2B), the piston rod 20 is built in the cylinder 10. A damping force (not shown) generates a damping force during the extension stroke.

  As described above, the suspension device 1 changes to the contracted state shown in FIG. 2A and the extended state shown in FIG. 2B, and the spring 30 absorbs an impact from the road surface or is built in the cylinder 10. By damping the expansion and contraction vibration of the spring 30 with the damping device, it functions as a shock absorber that does not transmit the unevenness of the road surface to the vehicle body, and functions to press the vehicle body against the road surface. The suspension device 1 improves the ride comfort and steering stability of the vehicle.

<Suspension support 60>
FIG. 3 is a view for explaining the suspension support 60.
As shown in FIG. 3, the suspension support 60 includes a washer 65 provided through the upper end portion side of the piston rod 20, a bracket member 70 that surrounds the outer periphery of the washer 65 and is fixed to the vehicle body side, these washers 65 and the bracket A mount rubber 80 that is an annular elastic member disposed between the member 70 and the member 70 is provided. The illustrated suspension support 60 is provided with the center line of the piston rod 20 in the vertical direction.

  The washer (inner member) 65 is a disk-shaped member, and a central hole 65a for inserting the upper end side of the piston rod 20 is formed in the central part of the disk. The washer 65 is fixed to the upper end portion of the piston rod 20 inserted into the central hole 65a by the nut 21. The washer 65 is made of, for example, an alloy of iron or aluminum.

  The bracket member (outer member) 70 includes a storage portion 79 that stores the mount rubber 80. The storage portion 79 is surrounded by an upper side wall portion 79a and a lower side wall portion 79b that sandwich the mount rubber 80 stored in the storage portion 79 in the center line direction, and an inner peripheral wall portion 79c that surrounds the mount rubber 80 from the outer peripheral side.

  In the example of illustration, it has the lower bracket member 75 of the bowl shape opened upwards, and the upper bracket member 77 which covers the opening of the upper surface. And the accommodating part 79 is formed because the lower bracket member 75 and the upper bracket member 77 overlap.

Here, in the illustrated example, a bump rubber holding portion 75 a that holds the bump rubber 41 via the dust cover 50 and the bump rubber cup 42 is provided below the lower bracket member 75. An upper spring holding portion 77 a that holds the spring 30 via the upper seat rubber 36 is provided below the upper bracket member 77.
Further, the bracket member 70 is fixed to the vehicle body by overlapping the lower bracket member 75 and the upper bracket member 77 and fastening them with the bolts 33.

FIG. 4 is a diagram for explaining the mount rubber 80.
4A is a perspective view of the mount rubber 80, and FIG. 4B is a top view of the mount rubber 80. 4C is a cross-sectional view taken along the line IVc-IVc shown in FIG. 4B, and FIG. 4D is a front view seen from IVd shown in FIG. 4B.

  The mount rubber (elastic member, buffer member) 80 is an elastic member that suppresses contact between the washer 65 and the bracket member 70 surrounding the washer 65. More specifically, the mount rubber 80 absorbs the vibration transmitted from the wheel via the piston rod 20 and the washer 65 without being absorbed by the cylinder 10 or the spring 30, and the vibration is transmitted to the vehicle body. To prevent.

The mount rubber 80 is an annular member. The inner peripheral diameter d1 (see FIG. 4B) of the mount rubber 80 is smaller than the outer shape of the washer 65.
An annular inner circumferential groove 83 extending in the circumferential direction is formed on the inner circumferential surface 81 of the mount rubber 80 at the center portion in the center line direction of the inner circumferential surface 81. The inner circumferential groove 83 has a cross-sectional shape corresponding to the washer 65 so as to hold the washer 65. The cross section of the inner circumferential groove 83 shown in FIG. 4C is substantially rectangular.

The mount rubber 80 is divided at one place in the annular circumferential direction. In the illustrated example, as shown in FIG. 4B, the mount rubber 80 has a slit (parting portion) 85 extending in the annular radial direction when viewed from one end side in the center line direction. Is formed.
Here, the slit 85 should just divide | segment the cyclic | annular circumferential direction, and does not require that the space is formed in the part divided | segmented.

The mount rubber 80 is made of a synthetic resin material or a rubber material. For example, the mount rubber 80 is made using a urethane foam material.
The slit 85 is formed by, for example, cutting (slicing) the mount rubber 80 using a metal saw blade as a cutting tool. In addition, as shown in FIG.4 (b), the slit 85 extended in a radial direction can shorten the time which a shaving process requires compared with the case where the slit 85 of another shape is formed.

Here, the relationship between the mount rubber 80 and the storage portion 79 of the bracket member 70 will be described with reference to FIGS. 3 and 4.
First, the length in the center line direction of the storage portion 79 formed by the lower bracket member 75 and the upper bracket member 77 is the length d2 in the center line direction of the mount rubber 80 not receiving force (see FIG. 4D). Shorter than. Thus, in a state where the mount rubber 80 is stored in the storage portion 79, the mount rubber 80 is compressed by the upper wall portion 79a and the lower wall portion 79b.

Further, when the mount rubber 80 is stored in the storage portion 79, the inner peripheral wall portion 79c in the storage portion 79 and the outer peripheral surface 87 of the mount rubber 80 are in contact with each other in the entire circumferential direction. Furthermore, when the slit 85 has a width (see d3 in FIG. 4D), when the mount rubber 80 is compressed, the width becomes smaller compared to the uncompressed state.
Preferably, the first rubber (divided section) 85a and the second surface (divided section) 85b, which are surfaces facing the slit 85 in the mount rubber 80, are stored in the storage portion 79 and compressed. Then, it will be in the state which mutually presses. In other words, one end 88 and the other end 89 of the mount rubber 80 facing each other in the slit 85 are preferably in contact with each other when the mount rubber 80 is stored in the storage portion 79 and compressed.

Here, when the slit 85 is formed and divided in the annular circumferential direction, the spring characteristics are different between a portion including the slit 85 and a portion not including the slit 85 in the circumferential direction of the mount rubber 80. For example, a portion including the slit 85 is easier to compress in the center line direction than a portion not including the slit 85. More specifically, when the mount rubber 80 is compressed in the direction of the center line, the stress generated in the mount rubber 80 is biased, and the mount rubber 80 has a direction.
The spring characteristics refer to the relationship between the load applied to the mount rubber 80 having a function as a spring and the deflection of the mount rubber 80 caused thereby.

  However, as described above, when the first surface 85a and the second surface 85d facing the slit 85 are pressed against each other, the portion including the slit 85 in the circumferential direction of the mount rubber 80 and the spring characteristic in the portion not including Differences are suppressed.

<Assembly of suspension support 60>
When the suspension support 60 is assembled, the washer 65 and the mount rubber 80 are separately formed, and then the washer 65 is fitted into the inner peripheral groove 83 formed in the inner peripheral surface 81 of the mount rubber 80. Here, the slit 85 is formed in the mount rubber 80 as described above, and the mount rubber 80 is divided in an annular circumferential direction. Therefore, it is possible to open a gap between one end 88 and the other end 89 of the mount rubber 80 facing each other in the divided portion. Thereby, the mount rubber 80 can be easily spread in the radial direction. Then, for example, the washer 65 is fitted into the inner peripheral groove 83 through the space between one end 88 and the other end 89.

The mount rubber 80 is not bonded to the washer 65 or the bracket member 70. Therefore, for example, since a process for performing vulcanization bonding or the like is not required, workability is higher than when bonding to the washer 65 or the bracket member 70.
Further, the mount rubber 80 according to the present embodiment facilitates the assembling work without greatly increasing the cost.

Here, the difference between the mount rubber 80 of the present embodiment and the comparative example will be described with reference to FIGS.
FIG. 5 is a view showing the mount rubbers 180, 280, and 380 of the comparative example.
Here, the mount rubbers 180, 280, and 380 shown in FIG. 5 do not have the slit 85 unlike the present embodiment. More specifically, the mount rubbers 180, 280, 380 are continuous without being divided in the circumferential direction.

The mount rubber 180 of the comparative example shown in FIG. 5A is an annular member. Therefore, when the mount rubber 180 is assembled to the washer 65, for example, it is necessary to insert the washer 65 while turning the inner peripheral side portion 181 of the mount rubber 180, and the mount rubber 180 may be damaged.
On the other hand, the mount rubber 80 according to the present embodiment opens the gap between the one end 88 and the other end 89 of the mount rubber 80 as described above, and the one end 88 and the other end 89. A washer 65 is inserted between the two. Therefore, it is not necessary to turn the inner peripheral side of the mount rubber 80, or even if it is turned, the degree is smaller than the mount rubber 180 of the comparative example. Further, the mounting rubber 80 can easily assemble the washer 65 and can reduce the working time as compared with the mounting rubber 180.

The mounting rubber 180 shown in FIG. 5 (a) is not formed separately from the washer 65, but foamed urethane material is injected and foam-molded with the washer 65 disposed in the molding cavity of the molding die. It is also conceivable to form it. However, in this case, for example, a large number of mount rubbers 180 cannot be formed from one mold, and productivity is lowered.
On the other hand, the mount rubber 80 of the present embodiment is formed separately from the washer 65 as described above. Therefore, productivity can be improved in the present embodiment.

  Next, the mount rubber 280 of the comparative example shown in FIG. 5B is formed by two members (an upper member 281 and a lower member 283). The upper member 281 is a cylindrical member, and a step 285 is formed on the inner peripheral side. The washer 65 is disposed so as to fit into the step 285. The lower member 283 is a disk-shaped member formed with a size that fits into the step 285. The washer 65 fitted into the step 285 is sandwiched and held between the upper member 281 and the lower member 283 in the center line direction.

The mount rubber 280 is formed by two members (an upper member 281 and a lower member 283) as described above. On the other hand, since the mount rubber 80 according to the present embodiment is formed by a single member, for example, labor required for component management is reduced.
In addition, the mount rubber 280 which is a comparative example has an influence on the spring characteristics and durability because the discontinuous portion of the mount rubber 280 is formed not in the circumferential direction but in the center line direction.

  Next, the mount rubber 380 of the comparative example shown in FIG. 5C is formed by two members (an upper member 381 and a lower member 383) as in FIG. 5B. The upper member 381 and the lower member 383 are cylindrical members, and steps 385 and 387 are formed on the inner peripheral side, respectively. The washer 65 is disposed so as to be sandwiched between the step 385 of the upper member 381 and the step 387 of the lower member 383.

  Similarly to the mount rubber 280, the mount rubber 380 is formed by two members (upper member 381 and lower member 383), whereas the mount rubber 80 of the present embodiment is formed by one member. The labor required for component management is reduced.

<Modification>
Next, a modified example of the mount rubber 80 of the present embodiment will be described.
FIG. 6 is a view for explaining a modified example of the mount rubber 80.

  In the above description, it has been described that the mount rubber 80 is formed with the slit 85 extending in the annular radial direction and extending in the center line direction. However, the shape of the slit 85 is not limited as long as the configuration is divided in the annular circumferential direction.

  For example, as shown in FIG. 6A, a slit 851 extending in a direction intersecting the center line direction when the mount rubber 80 is viewed from the front may be used. Alternatively, as shown in FIG. 6B, the slit 852 may extend in a direction intersecting with the radial direction when the mount rubber 80 is viewed from the upper surface.

Further, as shown in FIGS. 6C to 6H, the slit 85 may be formed so that the end surfaces of the one end 88 and the other end 89 of the mount rubber 80 have a shape other than a plane. Good.
For example, as shown in FIGS. 6C and 6D, slits 853 and 854 having portions 853a and 854a extending in the circumferential direction may be used.

Further, as shown in FIGS. 6E to 6H, slits 855, 856, 857, and 858 are formed such that one end 88 and the other end 89 of the mount rubber 80 are fitted to each other. Also good.
For example, by forming the slit 855 in FIG. 6E and the slit 857 shown in FIG. 6G, the one end portion 88 and the other end portion 89 are not easily displaced in the center line direction. Further, by forming the slit 856 of FIG. 6F and the slit 858 shown in FIG. 6H, the one end portion 88 and the other end portion 89 are not easily displaced in the radial direction.

DESCRIPTION OF SYMBOLS 1 ... Suspension device, 10 ... Cylinder, 20 ... Piston rod, 30 ... Spring, 60 ... Suspension support, 65 ... Washer, 70 ... Bracket member, 80 ... Mount rubber, 85 ... Slit

Claims (7)

A cylinder for containing oil inside,
A piston that divides the inside of the cylinder into two oil chambers and is slidably disposed inside the cylinder;
A piston rod that supports the piston and projects out of the cylinder from one end of the cylinder;
An inner member provided on the outer periphery of the piston rod protruding from the cylinder;
An outer member surrounding the outer periphery of the inner member;
An elastic member that is an annular member provided between the inner member and the outer member and around the piston rod;
The suspension device according to claim 1, wherein the elastic member is one member that is divided at one place in an annular circumferential direction.   The suspension device according to claim 1, wherein the elastic member is divided in the circumferential direction by an annular divided section extending in a radial direction.   The suspension device according to claim 1 or 2, wherein the elastic member has an annular outer peripheral side whole circumference in contact with an inner circumference of the outer member.   When the elastic member is provided at least between the inner member and the outer member and around the piston rod, the elastic member 2 is opposed to the annular member in the circumferential direction. The suspension device according to any one of claims 1 to 3, wherein two end portions are in contact with each other.   The suspension device according to any one of claims 1 to 4, wherein the elastic member is compressed by being sandwiched and compressed by the outer member at both ends in an annular center line direction. An inner member provided on the outer periphery of the piston rod protruding from the cylinder of the shock absorber;
An outer member surrounding the outer periphery of the inner member;
An elastic member that is an annular member provided between the inner member and the outer member and around the piston rod;
The suspension support according to claim 1, wherein the elastic member is one member divided at one place in an annular circumferential direction. An annular member provided around the piston rod between an inner member provided on the outer periphery of the piston rod protruding from the piston of the shock absorber and an outer member surrounding the outer periphery of the inner member,
An annular inner circumferential groove extending in an annular circumferential direction on the inner circumferential surface and holding the inner member;
The buffer member characterized by forming the cyclic | annular parting part which divides | segments one place in the said circumferential direction.

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