JPH11270606A - Connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure which can reduce the occupying space necessary for connection, while suppressing the influence of the length unevenness of an outer tube to a pre-load. SOLUTION: An inner tube 7 is inserted to a bolt member 15 projecting from a first member 3, while a second member 1 is fixed to an outer tube 4. An outward flange 7a of the inner tube 7 is inserted between one end face in the axial direction of an elastic body 8 and the first member 3. A washer member 13 provided coaxially on the outer periphery of the bolt member 16 in the condition opposing the other side end face in the axial direction of the elastic body 8 and imparting a pre-load in the axial direction to the elastic body 8 together with the outward flange 7a by fastening a nut member 10 screwed to the bolt member 15, is provided. The outer diameter surface of the elastic member 8 is fixed to the inner diameter surface of the outer tube 4, through a first tube metal fitting 9 pressed in to the inner diameter surface of the outer tube 4. The outer diameters of the washer member 13 and a second tube metal fitting 11 are set smaller than the inner diameter of the outer tube 4, and they are provided at the inner side of the outer tube 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for connecting a second member to a bolt member projecting from a first member via a bush, for example, connecting a link member to a vehicle body-side member or connecting a suspension member to a vehicle body. More particularly, the present invention relates to a connection structure for applying an axial preload to an elastic body of a bush and connecting the two members in a state of high axial rigidity.

[0002]

2. Description of the Related Art Conventionally, a connecting structure in which two members are connected by a bush in a state in which an axial preload is applied to increase rigidity in the axial direction is exemplified by the connection of a link member as shown in FIG. As shown in FIG.

The bush 50 used in this connection structure
Is constructed by interposing an elastic body 53 between an inner cylinder 51 and an outer cylinder 52 arranged coaxially. In this bush 50, the elastic members 5 are respectively provided from both axial end surfaces of the outer cylinder 52.
3 is projected so as to be able to apply a predetermined amount of preload, and the inner cylinder 51 is also set to a length that protrudes from both ends of the outer cylinder 52.

Then, a first washer 56 and an inner cylinder 51 are inserted into a bolt member 55 projecting from the first member 54, and one end surface in the axial direction of an elastic body 53 projecting from one end of the outer cylinder 52 is fixed to the first member. It contacts the first member 54 via the washer 56. Further, the second washer 57 is brought into contact with the other end in the axial direction of the elastic body 53 protruding from the other end of the outer cylinder 52, and the nut member 58 screwed to the bolt member 55 is tightened, thereby obtaining the elasticity. The body 53 is sandwiched between both washers 56 and 57, and a state in which an axial preload is applied to the elastic body 53.

Here, reference numeral 59 denotes a first member welded to the outer cylinder 52. When the suspension member is mounted on the body frame, for example, a connection structure as shown in FIG. 5 is adopted.

The bush 50 used in this connection structure
Is composed of three parts, the first part is an inner cylinder 51 having an outward flange 51a on the outer periphery of one end in the axial direction,
The outer periphery of the one end side of the inner cylinder 51 and the outward flange 5
The first elastic body 60 is coaxially fixed to the first elastic body 1a, and the first cylindrical metal fitting 61 is coaxially fixed to the outer periphery of the first elastic body 60. An outward flange 61a axially opposed to the outward flange 51a of the inner cylinder 51 is also provided at one axial end of the first cylindrical fitting 61, and the first flange 61a is provided between both outward flanges 51a, 61a. A part of the elastic body 60 is inserted.

The second part is an outer cylinder 52 having a second member 59 (suspension member) welded to the outer diameter surface. The first cylinder fitting 61 of the first component is press-fitted into one end of the outer cylinder 52 in the axial direction, and the two are integrally connected. At this time, the outward flange 61a of the first cylinder fitting 61 is
The first elastic body 60 is in contact with one end face of the outer cylinder 52 in an axially outward direction of one end face of the outer cylinder 52.

The third component is a second cylindrical metal member 62 having a cylindrical body having substantially the same diameter as the first cylindrical metal member 61 and having an outwardly directed flange 62a formed on one end side surface.
and a washer member 63 fixed on a surface facing outward in the axial direction of a through a second elastic body 63. The cylindrical portion of the second cylindrical member 62 is inserted into the other axial end of the outer cylinder 52, and the outward flange 62 a of the second cylindrical member 62 is in contact with the other axial end surface of the outer cylinder 52. As a result, the second elastic body 53 is disposed axially outward of the axial end surface of the outer cylinder 52, so that the outer cylinder 52 is sandwiched between the first component and the second component. Becomes

Then, by tightening the nut member 58 screwed to the tip of the bolt member 55, the second elastic body 63 is brought into contact with the washer member 57 and the second tube fitting 62 (the other end surface of the outer tube 52). A preload is applied while being sandwiched, and the first elastic body 60 is sandwiched between the first cylinder fitting 61 (one end surface of the outer cylinder 52) and the outward flange 51 a of the inner cylinder 51.

[0010]

However, in the above-described conventional connection structure, the elastic members protruding axially outward from both ends of the outer cylinder 52 are axially loaded to apply an axial preload. For the configuration to be set, the first member 54
The distal end of the bolt member 55 protruding from the outer member 52 must necessarily be designed to protrude from the outer cylinder 52, and the first member 54 and the second member 59 There is a problem that an occupied space required for connection needs to be set large. The same applies to the inner cylinder 51.

When the length of the outer cylinder 52 is increased in order to secure a predetermined welding strength for the connection between the outer cylinder 52 and the second member 59, the bolt member 55 becomes longer, and the outer cylinder 5
There is also a problem that the length of the bolt member 55 affects the length of the bolt member 55. The same applies to the inner cylinder 51.

The second member 5 is attached to the outer cylinder 52 by welding.
Since the welding is performed, the length of the outer cylinder 52 varies due to the welding, and it is difficult to reduce the dimensional tolerance. However, in the conventional structure, since the preload is applied across the outer cylinder, the elastic body 5
There is a problem in that the preload applied to 3, 60, or 63 has a predetermined or more variation.

The present invention has been made in view of the above-mentioned problems, and it is possible to reduce the occupied space required for the connection while suppressing the influence of the variation of the length of the outer cylinder on the preload. The task is to provide a structure.

[0014]

In order to solve the above-mentioned problems, a connecting structure according to a first aspect of the present invention comprises a bush having an elastic body interposed between an inner cylinder and an outer cylinder. A structure for connecting the first member and the second member, wherein an inner cylinder is inserted into a bolt member protruding from the first member and the second member is fixed to an outer diameter surface of the outer cylinder; A first holding member interposed between one end surface in the axial direction of the elastic body and the first member to restrict movement of the elastic body toward the first member; And a second holding member for applying an axial preload to the elastic body together with the first holding member by tightening a nut member screwed to the bolt and coaxially arranged on the outer periphery of the bolt member. In the connection structure, the outer diameter surface of the elastic body is pressed into the inner diameter surface of the outer cylinder. Fixed to the inner surface of the outer cylinder via the first cylindrical metal fitting, and the outer diameter of the second holding member is set smaller than the inner diameter of the outer cylinder. It is characterized by being arranged in.

Next, according to a second aspect of the present invention, in the configuration described in the first aspect, the first holding member is arranged so that the first holding member sandwiches a part of the elastic body in the axial direction of the first cylindrical member. The second holding member is axially opposed to the one end portion, and the second holding member abuts on the other end surface in the axial direction of the first cylindrical fitting by tightening the nut member, and the second elastic member is provided on the seating surface of the nut member via the second elastic body. It is characterized in that it abuts in the axial direction.

According to a third aspect of the present invention, in the configuration described in the second aspect, the second holding member is engaged with the inner diameter surface of the outer cylinder and the other end surface of the first cylinder fitting. A cylindrical engaging portion that abuts on the cylindrical member.

Next, according to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the tip of the bolt member is disposed inside the outer cylinder. It is characterized by the following.

Next, according to a fifth aspect of the present invention, in the configuration described in any one of the first to fourth aspects, the first holding member is provided with an outwardly projecting radially projected from the inner cylinder. It is characterized by being a flange.

Next, according to a sixth aspect of the present invention, an elastic body is attached to the outer diameter surface of the second holding member, in addition to the configuration according to any one of the first to fifth aspects. It is characterized by the following.

Next, a seventh aspect of the present invention is characterized in that a cutout is provided at the other end in the axial direction of the outer cylinder, in addition to the configuration described in any one of the first to sixth aspects. It is assumed that.

[0021]

According to the first aspect of the present invention,
By arranging the second clamping member in the outer cylinder among the clamping members that apply an axial preload to the elastic body by tightening the nut member, the length of the bolt member depends on the length of the outer cylinder. Disappears. As a result, variation in preload due to variation in dimensional tolerance of the outer cylinder can be suppressed, and there is an effect that rigidity in the axial direction can be set with predetermined accuracy.

Further, by disposing the second holding member in the outer cylinder, the length of the bolt member and the inner cylinder is shorter than in the prior art, so that the space required for connection is reduced. At this time, if the invention described in claim 2 is adopted,
There are the following effects in addition to the above effects.

When the second holding member is brought into contact with the first cylindrical member, the axial force generated by the tightening of the nut member is transmitted to the first cylindrical member through the second holding member, and the first cylindrical member is axially connected to the first cylindrical member. The load is mainly applied to the elastic body portion sandwiched between the first holding member.

For this reason, since it is not necessary to contact the second holding member with the elastic body, the amount of the elastic body can be reduced, and the rigidity in the radial direction can be reduced while increasing the rigidity in the axial direction. This has the effect of increasing the degree of freedom in setting the elastic characteristics in the direction.

Here, since the first cylindrical member is fixed to the outer cylinder by press-fitting, there is no variation in dimensions due to welding heat or the like.
In addition, when the invention described in claim 3 is adopted, in addition to the above-described effects, the provision of the engaging portion facilitates the insertion of the second holding member into the outer cylinder and adjusts the length of the engaging portion. By doing so, there is an effect that the length of the bolt member (the position at which the nut member is tightened) can be changed without affecting the length of the first cylindrical member.

According to the fourth aspect of the present invention, in addition to the above-described effects, the bolt member is hidden in the outer cylinder, so that the bolt member and another component located outside the other axial end of the outer cylinder can be connected to the bolt. Interference with the member can be avoided, and there is an effect that the degree of freedom of layout of the other component is improved, such as disposing the other component closer to the outer cylinder.

In addition, when the invention described in claim 5 is adopted, in addition to the above-described effects, the first holding member is installed simply by inserting the inner cylinder into the bolt member, and a connection structure that is easy to assemble is provided.

In the present invention, the second holding member is disposed in the outer cylinder. However, when the invention described in claim 6 is adopted, the second holding member disposed inside the outer cylinder swings. Even when the elastic body is in contact with the inner surface of the outer cylinder, the elastic body is attached, so that there is an effect that generation of abnormal noise is prevented.

Further, when the invention of claim 7 is adopted, even if the second holding member, the nut member, and the like are arranged in the outer cylinder as described above, the effect that the assembling is facilitated by providing the notch. is there.

[0030]

Next, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the connection structure of the present embodiment.

In the first embodiment, the suspension member 1 (second member) is
This is a connection structure for mounting on the (first member). First, the bush 2 to be used and the second holding member
The structure of the component 6 will be described. In the present embodiment, the bush 2 includes the outer cylinder 4 and the first component 5.

The suspension member 1 is attached to the outer diameter surface of the outer cylinder 4 by welding. At this time,
The welding strength between the suspension member 1 and the suspension member 1 is regulated by the bead length at the time of welding, and the outer cylinder 4 is set to a length that ensures the required strength.

As shown in FIG. 2, the first component 5 includes an inner cylinder 7, a first elastic body 8, and a first cylinder fitting 9. An outward flange 7a is provided on the outer periphery of one end of the inner cylinder 7 on the side in contact with the vehicle body frame 3, and
A holding member is configured. A first elastic body 8 is coaxially arranged on the outer periphery of the inner cylinder 7 on the one end side and the outward flange 7a. The inner peripheral side of the first elastic body 8 is vulcanized and bonded to the inner cylinder 7. A first cylindrical member 9 is coaxially arranged on the outer peripheral side of the inner cylinder 7 with the first elastic member 8 interposed therebetween, and the first elastic member 8 is vulcanized and adhered to the inner diameter surface of the first cylindrical member 9. ing. An outward flange 9a that is axially opposed to the outward flange 7a of the inner cylinder 7 is also provided on one axial end side of the first cylindrical metal fitting 9, and the first flange is also provided between both outward flanges 7a. A part 8a of the elastic body 8 is inserted.

At this time, the length of the first elastic body 8 in the axial direction is shorter than the first cylinder 9, and the length of the first cylinder 9 is shorter than the inner cylinder 7. In the present embodiment, the inner cylinder 7
Is set shorter than the outer cylinder 4 (FIG. 1).
reference).

The second component 6 is a cylindrical body having a diameter slightly smaller than that of the first metal fitting and having an inward flange 11a formed at one end on the nut member 10 side. A washer member 13 is fixed to a surface of the flange 11a facing outward in the axial direction via a second elastic body 12.

Here, the cylinder main body 1 of the second cylinder fitting 11 is described.
1b constitutes an engaging portion. Further, in the present embodiment, the second component 6 constitutes the second holding member according to claim 2. However, when the second elastic body 12 is also regarded as an elastic body of the bush, the washer member 13 is used as the second holding member. It becomes a member.

The washer member 13 is connected to the second elastic body 12 so as to be easily assembled.
It may be configured separately from 2. In the present embodiment, the second
The outer diameters of the tube fitting 11 and the washer member 13 are set slightly smaller than the inner diameter of the outer tube 4.

Here, a thin elastic body 14 is also vulcanized and bonded to the entire outer diameter surface of the cylindrical portion of the second cylindrical fitting 11. Then, as shown in FIG. 1 described above, the first cylindrical member 9 of the first component 5 is coaxially pressed into one axial end of the outer cylinder 4 to couple the first component 5 to the outer cylinder 4. .

Next, the connection between the suspension member 1 and the body frame 3 using the bush 2 will be described.
Bolt members 15 projecting downward from the body frame 3
The inner cylinder 7 of the first component 5 connected to the outer cylinder 4 is inserted from below, and its outward flange 7a contacts the vehicle body frame 3. Next, the second component 6 is inserted into the bolt member 15, and the nut member 10 is further screwed to the bolt tip.

Further, a preload is applied by tightening the nut member 10 until the washer member 13 comes into contact with one axial end surface of the inner cylinder 7. That is, as the nut member 10 is tightened, the washer member 13 moves toward the vehicle body frame 3, and the end surface of the second cylindrical member 11 first comes into contact with the end surface of the first cylindrical member 9. Further, when the washer member 13 moves toward the vehicle body frame 3, an axial load is applied to the second elastic body 12, and further, a force is transmitted to the first cylinder 9 through the second cylinder 11, and the second elastic body 12 is moved to the first cylinder 9. The first cylindrical member 9 is displaced toward the vehicle body frame 3, so that the first elastic member 8, in particular, the first elastic member between the outward flange 9 a of the first cylindrical member 9 and the outward flange 7 a of the inner cylinder 7. An axial preload is applied to 8a.

In the above embodiment, the nut member 10
A notch 4a is provided in a part of the outer cylinder 4 on the other end side in the axial direction in order to facilitate the tightening of the outer cylinder. In the related art, a notch cannot be provided for bringing the metal fitting for holding into contact with the other end surface in the axial direction of the outer cylinder 4. On the other hand, in this embodiment, since there is no metal fitting to contact the other end of the outer cylinder 4 in the axial direction, the notch 4a can be provided in a portion where the suspension member 1 is not fixed.

Next, the operation and the like of the connecting structure having the above configuration will be described. In the connection structure described above, even if the length of the outer cylinder 4 is increased in order to secure required welding strength, it is not necessary to increase the lengths of the bolt member 15 and the inner cylinder 7 accordingly. That is, even if the design of the length of the outer cylinder 4 is changed,
It is not necessary to change the lengths of the bolt member 15 and the inner cylinder 7.

The outer cylinder 4 is provided with the suspension member 1.
Although the length dimension varies due to welding at the time of mounting, the present embodiment employs a nut member 1 for applying a preload.
Since a tightening force of 0 is not applied to the first elastic body 8 through the outer cylinder 4, a stable axial preload can be applied without being affected by variations in the length of the outer cylinder 4.

Here, in the present embodiment, the tightening force of the nut member 10 is transmitted through the two cylindrical fittings 9 and 11, but the first cylindrical fitting 9 is connected to the outer cylinder 4 by press-fitting. Since the two-cylinder metal fitting 11 is only inserted into the outer cylinder 4, the two-cylinder metal fittings 9 and 11 do not vary in length as in the outer cylinder 4. Further, even if the press-fit amount of the first cylinder 9 is changed, it is not necessary to change the lengths of the bolt member 15 and the inner cylinder 7 by adjusting the length of the second cylinder 11. The preload can also be adjusted by adjusting only the length of the second tube fitting 11.

Further, in this embodiment, since the bolt member 15 is housed in the outer cylinder 4, the axial length occupied by the connection is reduced, and a stabilizer or the like disposed below the bolt member 15 is provided. The space between the parts becomes wider. As a result, the degree of freedom in the layout of components such as the stabilizer is improved. Further, the external cylinder 4 also prevents other parts from directly interfering with the bolt member 15.

In the present embodiment, the second elastic body 12
A portion 8 of the first elastic body 8 between the outward flange 9a of the first cylindrical fitting 9 and the outward flange 7a of the inner cylinder 7
A is mainly applied with a preload in the axial direction, so that a predetermined rigidity is secured in the axial direction.

At this time, the axial load is not applied to a portion 8b of the first elastic body 8 between the inner cylinder 7 and the first cylindrical fitting 9 in the radial direction. By separately adjusting the hardness of the body, the rigidity in the radial direction can be set to an arbitrary value. In FIG. 1, adjustment is made by means of a grinder.

Further, from this, even if a radial force is transmitted to the outer cylinder 4, the force is mainly transmitted to the inner cylinder 7 and the first cylinder fitting 9 in the radial direction of the first elastic body 8. Part 8 between
Since it is received at b, it is also possible to make the length of the bolt member 15 shorter than the length shown in FIG.

Also, at this time, since the elastic body 14 is also attached to the outer diameter surface of the second cylindrical fitting 11, even if the second cylindrical fitting 11 comes into contact with the outer cylinder 4 due to swinging or the like, it is unnecessary. The generation of abnormal noise is prevented.

Further, in the bush structure of this embodiment, since no elastic body is provided between the first elastic body 8 and the second elastic body 12, the amount of the elastic body can be reduced accordingly. In the above-described embodiment, the axial end surface of the second cylindrical member 11 is brought into contact with the axial end surface of the first cylindrical member 9, so that the inner cylindrical member 7 and the cylindrical members 9, 11 are formed. Water is prevented from entering the space 17 from outside.

Next, a second embodiment will be described with reference to the drawings. The same members and the like as those in the first embodiment will be described with the same reference numerals. As shown in FIG. 3, the bush 2 used in the present embodiment includes the first component 5 and the outer cylinder 4 described in the first embodiment, and the second component in the first embodiment. There is no 6, and the washer 20 forms a second holding member.

However, in the first part 5 of the present embodiment, the first cylindrical member 9 is longer than that of the first example, and the first elastic body 8 is formed of a nut member in the first cylindrical member 9. 10
It is set so as to protrude outward in the axial direction from the side end.

However, similarly to the first embodiment, the length of the inner cylinder 7 and the bolt member 15 is stored in the outer cylinder 4. Then, the first component 5 to which the outer cylinder 4 is connected is inserted into the bolt member 15 protruding from the first member 3, and the nut member 10 is inserted via the washer 20 (second holding member).
Into the bolt. By tightening the nut member 10, the first elastic body 8 is sandwiched between the washer 20 and the outward flange 7 a of the inner cylinder 7, and an axial preload is applied to the first elastic body 8.

In this case, an elastic body is attached to the outer peripheral surface of the washer 20 facing the inner surface of the outer cylinder 4 to prevent generation of abnormal noise when the inner surface of the washer 20 comes into contact with the inner surface of the outer cylinder 4 by swinging. It is preferable to do so.

The operation and effect are the same as those of the first embodiment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a connection structure according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a bush according to the embodiment of the present invention.

FIG. 3 is a sectional view showing another connection structure according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a conventional connection structure.

FIG. 5 is a sectional view showing a conventional connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suspension member (2nd member) 2 Bush 3 Body frame (1st member) 4 Outer cylinder 5 1st part 6 2nd part 7 Inner cylinder 8 1st elastic body 9 1st cylinder fitting 10 Nut member 11 2nd Tube fitting 12 Second elastic body 13 Washer member 14 Elastic body 15 Bolt member 20 Washer

Claims (7)

[Claims] 1. A structure in which a first member and a second member are connected by a bush having an elastic body interposed between an inner cylinder and an outer cylinder, wherein a bolt member protruding from the first member is provided. And the second member is fixed to the outer diameter surface of the outer cylinder, and is inserted between the one end surface of the elastic body in the axial direction and the first member to the first member side. The first that regulates the movement of the elastic body
The holding member and the first holding member are coaxially disposed on the outer periphery of the bolt member in a state of being opposed to the other end surface in the axial direction of the elastic body and screwed together with the first holding member by the nut member screwed to the bolt. A second holding member for applying a preload in the direction, wherein the outer diameter surface of the elastic body is press-fitted into the inner diameter surface of the outer cylinder.
It was fixed to the inner surface of the outer cylinder via a tube fitting, and the outer diameter of the second holding member was set smaller than the inner diameter of the outer tube, and the second holding member was disposed inside the outer tube. A connection structure characterized by that: 2. The first holding member is axially opposed to one axial end of the first cylindrical member with a part of the elastic body interposed therebetween, and the second holding member is configured to tighten a nut member. The connecting structure according to claim 1, wherein the first cylindrical member contacts the other end surface in the axial direction of the first cylindrical member and the seat surface of the nut member in the axial direction via a second elastic body. 3. The device according to claim 2, wherein the second holding member has a cylindrical engaging portion that engages with the inner surface of the outer cylinder and abuts on the other end surface of the first cylinder. Connection structure. 4. The bolt member according to claim 1, wherein a tip portion of the bolt member is disposed inside the outer cylinder.
The connection structure according to any one of the above. 5. The connection structure according to claim 1, wherein the first holding member is an outward flange projecting radially from the inner cylinder. 6. The connection structure according to claim 1, wherein an elastic body is attached to an outer diameter surface of the second holding member. 7. The connecting structure according to claim 1, wherein a notch is provided at the other end of the outer cylinder in the axial direction.