JPH06262921A - Link structure for suspension and attaching method therefor - Google Patents

Abstract

PURPOSE:To miniaturize a lateral displacement absorbing member interposed in the fitting part between a lateral link and an axle beam. CONSTITUTION:The axle beam side end part of a lateral link 7 is fitted to an axle beam 3 via a lateral slippage absorbing member 10. The lateral slippage absorbing member 10 is composed of nearly coaxial outer and inner tubes 10a and 10c and a rubber bush 10b interposed between both the tubes 10a and 10c. A hollow part 10d is formed in the rubber bush 10b to set lateral direction rigidity to be low. The center axis of the inner tube 10c is offset on the lateral link 7 side than that of the outer tube 10a in a condition where the lateral link 7 is made horizontal, and the end part of the lateral link 7 is fitted to the axle beam 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension link structure having a lateral link and a control link for supporting a load in the vehicle width direction and for restricting an axle beam in the vehicle width direction, and more particularly to a lateral link structure thereof. The present invention relates to a suspension link structure characterized by a link mounting structure.

[0002]

2. Description of the Related Art A conventional lateral link structure for supporting a load in the vehicle width direction of a conventional vehicle is disclosed in, for example, Japanese Patent Laid-Open No. 62-62.
As described in JP-A-205813, a lateral link extending axially in the vehicle width direction has one end pivotally attached to an axle beam and the other end pivotally attached to a vehicle body member member. Has been done.

However, in the above lateral link structure, the lateral link is
Rotation is performed around the vehicle body side member mounting portion, and due to the rotation operation, the axle beam connected to the end portion of the lateral link is displaced laterally relative to the vehicle body. In order to regulate the lateral movement, there is a lateral link structure as described in, for example, Japanese Patent Application No. 3-66189.

In this lateral link structure, as shown in FIG. 6, a lateral link 7 extending in the vehicle width direction pivotally attaches one end of the lateral link 7 to the axle beam 3 via a lateral displacement absorbing member 10 while swinging. The other end is axially attached to a member on the vehicle body side, and the midway in the longitudinal direction of the lateral link 7 and the midway in the longitudinal direction of the axle beam 3 are connected to the control link 14.
It is configured to be swingably connected by. The lateral displacement absorbing member 10 has a rubber bush 10 between an inner cylinder 10c and an outer cylinder 10a that are coaxial with each other with their axes oriented in the vehicle longitudinal direction.
b is interposed, and the hollow portion 1 is provided in each of the left and right positions of the rubber bush 10b sandwiching the inner cylinder 10c.
0d is formed, and the rigidity of the rubber bush 10b in the vehicle width direction is set to be low.

In the lateral link structure having the above structure, the lateral link 7 and the control link 14 support the load in the vehicle width direction. Further, at the time of bouncing / rebounding, the other end of the lateral link 7 is rotated around the vehicle body side mounting portion of the lateral link 7, but the control link 14 causes the lateral link 7 to rotate.
The rubber bush 10b of the lateral displacement absorbing member 10 flexes in the vehicle width direction while swinging around the side mounting portion, and absorbs the lateral displacement of the axle beam side end portion of the lateral link 7, and thus the axle beam. The lateral displacement of 3 is regulated.

In the above link structure, normally,
In the normal state, both the axial lines of the lateral link 7 and the control link are set to be horizontal so that the bounce amount and the rebound amount can be equalized. In the conventional state, in the normal state, the inner cylinder 10c and the outer cylinder 10c are kept in the normal state, that is, when the lateral link 7 is in the horizontal state so that the rubber bush 10b of the lateral displacement absorbing member 10 is not loaded. 10a
The lateral link 7 and the control link 14 are assembled so as to be coaxial with each other.

[0007]

When bound or rebounded from the normal state, as shown in FIG. 6, the rubber bush 10b of the lateral displacement absorbing member 10 is deflected by ε in the vehicle width direction, and the other end of the lateral link 7 described above is bent. The lateral displacement of the axle beam 3 with respect to the lateral displacement of At this time,
The rubber bush 10b bends by ε in the direction away from the lateral link 7 from the neutral position, and the inner cylinder 10c
Is displaced relative to the outer cylinder 10a in a direction away from the lateral link 7, but is not displaced in a direction toward the lateral link 7.

However, in the conventional link structure as described above, the center axis of the inner cylinder 10c is set to coincide with the center axis of the outer cylinder 10a in the normal state, that is, at the intermediate position between the full bound and the full rebound. Therefore, the central axis of the inner cylinder 10c does not move to the lateral link 7 side relative to the central axis of the outer cylinder 10a. Therefore, in order to prevent the inner cylinder 10c from coming into contact with the outer cylinder 10a at the time of bound / rebound, the radius of the outer cylinder 10a is set to
Inner cylinder 10c with respect to outer cylinder 10a during rebound
It is necessary to set the lateral displacement absorption member 10 larger than the relative lateral displacement amount ε, which causes a problem that the lateral displacement absorbing member 10 becomes large.

The present invention has been made in view of the above problems, and an object thereof is to downsize the lateral displacement absorbing member.

[0010]

In order to achieve the above object, the suspension link structure of the present invention has one end connected to an axle beam through a lateral displacement absorbing member and extending in the vehicle width direction, and the other end. A lateral link that connects the vehicle body side member and a control link that connects the midway position in the longitudinal direction of the lateral link and the axle beam, and the lateral displacement absorbing member is arranged with its axis oriented in the vehicle longitudinal direction. A rubber bush having low rigidity in the vehicle width direction is interposed between the outer cylinder and the inner cylinder.The inner cylinder is fixed to the axle beam side and the outer cylinder is fixed to the lateral link side. In the suspension link structure described above, the central axis of the inner cylinder is offset toward the lateral link from the central axis of the outer cylinder at a position where the lateral link is horizontal or substantially horizontal. It is characterized in that it is set to be bets.

Further, in the link structure of the suspension using the lateral displacement absorbing member in which the rubber bush is set so that the central axes of the outer cylinder and the inner cylinder are coaxial or substantially coaxial when there is no load. At a position where the inner cylinder and the outer cylinder of the lateral displacement absorbing member are coaxial or substantially coaxial, one end of the axle beam and the lateral link is temporarily assembled through the lateral displacement absorbing member and the space between the lateral link and the axle beam. After temporarily assembling the control link to the, the lateral link may be moved to a horizontal or substantially horizontal position, and the pivot points of the temporarily assembled links may be finally tightened.

[0012]

When the wheel bounces and rebounds from the normal state, that is, the state where the lateral link and the control link are horizontal, the inner cylinder moves only in the direction away from the lateral link with respect to the outer cylinder. In view of this,
In the present invention, when the lateral link is horizontal, that is, in the normal state, the center axis of the inner cylinder is set to be offset to the lateral link side in advance from the center axis of the outer cylinder, so that when the bound / rebound occurs. Since the movable space of the inner cylinder in the outer cylinder becomes large, the diameter of the outer cylinder can be set smaller than the conventional one.

Further, in the assembly of the suspension link structure using the lateral displacement absorbing member in which the central axes of the outer cylinder and the inner cylinder are coaxial or substantially coaxial when no load is applied, the rubber bush of the lateral displacement absorbing member is unloaded. After temporarily attaching the ends of each link at the position where it becomes a state, the lateral link axis is made horizontal, that is, the normal position is set and the pivot point of the temporary attachment is fully tightened to absorb the lateral displacement during normal operation. The rubber bush of the member is attached in a state of being bent toward the lateral link.

As a result, at the time of bound / rebound, the rubber bush of the lateral displacement absorbing member is bent in the direction away from the lateral link while passing through the neutral position on the way, so the amount of flexion from the neutral position is small. As a result, the strength of the rubber bush is ensured when the lateral displacement absorbing member is downsized. By the way, when the bush is set so that the inner cylinder is eccentric to the lateral link side in the unloaded state,
When the lateral displacement absorbing member is downsized, the amount of bending from the neutral position of the rubber bush increases, and there is a possibility that a predetermined strength for the rubber bush cannot be secured.

Further, at a position where the rubber bush of the lateral displacement absorbing member is in an unloaded state, that is, when the link is not horizontal,
When the ends of each link are fully tightened, when the lateral link is moved to the normal horizontal position, it will move upward or downward to the respective rubber bushes for swing absorption installed at the connection part of each link. Since it is attached in the state where a biased twist toward the side is applied, the amount of deflection on one side when the wheel bounces and rebounds becomes large, which is one of the factors that deteriorate the durability of each bush. Since the final tightening is performed after the link is set to the horizontal position which is the normal time, the link is set in a state in which the vertical twist does not occur and the durability of each rubber bush is not deteriorated.

[0016]

Embodiments of the present invention will be described with reference to the drawings.
First, the configuration will be described. As shown in FIGS. 2 and 3, wheels 2 are rotatably supported by left and right axles 1, respectively, and the left and right axles 1 are provided at both left and right ends of an axle beam 3 extending in the vehicle width direction. Each is fixed integrally.

On both left and right ends of the axle beam 3,
The rear ends of the trailing arms 4 are fixed, and the left and right trailing arms 4 extend forward of the vehicle body, respectively, and the front ends thereof are swingably connected to the vehicle body member member 5. Further, the lower ends of the shock absorbers 6 are attached to the left and right axles 1, respectively, and the respective shock absorbers 6 extend upward and connect the upper ends thereof to the vehicle body member member 5.

A mounting pin supporting bracket 8 for a mounting pin 9 which pivotally supports one end of the lateral link 7 is provided upright on the upper portion of the axle beam 3 on the right side in the vehicle width direction. The mounting pin supporting bracket 8 has a U-shaped vertical cross section opened downward, and has a pair of mounting holes whose axes are oriented in the vehicle width direction. And
The mounting pin 9 is welded with the head inserted into the pair of mounting holes and extends toward the front of the vehicle body.

A lateral link 7 extending in the vehicle width direction is swingably supported at the tip of the mounting pin 9.
The lateral end of the lateral link 7 on the side of the axle beam 3 has a lateral displacement absorbing member 1 as shown in FIGS.
It is attached to the axle beam 3 via 0.

The lateral displacement absorbing member 10 includes an outer cylinder 10a and an inner cylinder 10c which are arranged substantially coaxially with their axes facing forward and backward.
Rubber bush 1 interposed between the two cylinders 10a and 10c
0b and 0b. The rubber bush 10b has hollow portions 10 at right and left positions with the inner cylinder 10c interposed therebetween.
d is formed and the rigidity in the lateral direction is set to be low.
The displacement amount of the inner cylinder 10c in the vehicle width direction with respect to a is large and swingable.

In the rubber bush 10b connecting the inner cylinder 10c and the outer cylinder 10a, an intermediate plate 10e having a circular arc-shaped longitudinal section is coaxially arranged with the inner cylinder 10c in a vertical position so as to sandwich the inner cylinder 10c. It is embedded to reinforce the rubber bush 10b. Then, with the lateral link 7 fixed to the outer cylinder 10a and the lateral link 7 is horizontal as shown in FIG. 1, the central axis of the inner cylinder 10c is larger than the central axis of the outer cylinder 10a. 7 is set so as to be offset to the side, and the end portion of the lateral link 7 is laterally displaced.
It is attached to the axle beam 3 via 0.

The main body of the lateral link is composed of the first plate member 11 and the second plate member 12 as main members. The first plate member 11 has one end fixed to the outer cylinder 10a and extends leftward in the vehicle width direction. An upper edge and a lower edge of the first plate member 11 are respectively bent in the front-rear direction of the vehicle body to form a flange, which is reinforced.

Further, the first plate member 11 is bent so that its middle part is located on the axle beam 3 side from the rotation center axis line P of the lateral link 7 connecting the rotation centers of both end mounting portions, and will be described later. The position near the attachment portion of the control link to the axle beam 3 is wide in the vertical direction. The left and right ends of the second plate member 12 are fixed to the first plate member 11. The second plate member 12 is also reinforced by bending the upper and lower edges thereof in the vehicle front-rear direction to form a flange, and the second plate member 12 is reciprocated in the vehicle front-rear direction about the rotation center axis P of the lateral link 7. It is bent symmetrically with the first plate member 11 in a direction away from the axle beam 3, and has the same shape as the first plate member 11 and the central portion is wide in the vertical direction.

Further, the first plate member 11 and the second plate member 1
Reinforcing plates 13 are laterally provided at the upper end and the lower end of 2, respectively, so that the space between the first plate member 11 and the second plate member 12 is prevented from opening. Further, in the first plate member 11 and the second plate member 12, mounting holes 11a, 12a for axially supporting the control link 14 are formed with their axes oriented in the vehicle front-rear direction, and in the wide portion, Windows 17 are formed to extend in the vertical direction.

A vehicle body side member mounting portion 16 is provided on the other end side of the first plate member 11. Also in the vehicle body side member mounting portion 16, an outer cylinder 16a and an inner cylinder 16c whose axes are oriented in the vehicle front-rear direction are arranged coaxially, and the outer cylinder 16a and the inner cylinder 1 are arranged.
A rubber bush 16b is interposed between the 6c and 6c. Then, the mounting pin 9 supported by the axle beam 3 passes through the inner cylinder 10c of the lateral beam 7 side mounting portion of the lateral link 7, and the nut 15 is screwed to the tip of the mounting pin 9, whereby Lateral link 7
Has one end pivotally attached via the axle beam 3 and the inner cylinder 16c of the attachment portion 16 formed at the other end to the vehicle body side member member 5 via the attachment pin 18. It is mounted so that it can swing.

The control link 14 is arranged so as to be sandwiched between the two plate members 11 and 12 constituting the lateral link 7. The control link 1
Reference numeral 4 includes a control link body 14a and mounting portions 14b and 14c fixed to both ends of the control link body 14a. The control link body 14a extends in the vehicle body width direction and opens downward. It is formed by a plate member having a vertical U-shaped cross section.
The mounting portions 14b and 14c are the outer cylinder 14d and the inner cylinder 14e whose axes are oriented in the front-rear direction of the vehicle body, and both cylinders 1 thereof.
It is composed of a rubber bush 14f interposed between 4d and 14e.

Then, the central axis P connecting the mounting portions on both ends of the lateral link 7 and the central axis P connecting the mounting portions on both ends of the control link 14 are substantially coaxial so that the control link 14 is lateral. It is arranged in the space between the two plate members 11 and 12 forming the link. Then, with the inner cylinder 14e of the one mounting portion of the control link 14 and the pair of mounting holes formed in the lateral link 7 being oriented coaxially in the longitudinal direction of the vehicle body, the mounting pin 20 is attached to the one mounting hole. 11a is inserted into the other through the mounting hole 12a, and a nut 21 is screwed into the tip of the mounting pin 20, so that the mounting pin 20 forms the two plate members 11 constituting the lateral link. The control link 14 is laterally bridged between 12 and is pivotally attached to the lateral link 7 via the mounting pin 20 so as to be swingable.

The other mounting portion of the control link 14 is arranged at a position where it can be exposed through a pair of windows 17 provided in the lateral link 7 in the vehicle front-rear direction. A mounting bracket 22 is erected at a position where the other mounting portion of the control link 14 of the axle beam 3 can be opposed to the front-rear direction of the vehicle body. The mounting bracket 22 has a U-shaped vertical cross-section that opens downward, and has a pair of mounting holes extending in the vehicle front-rear direction.

In the mounting hole of the mounting bracket 22,
A mounting pin 23 is fixed by welding by inserting its head from the front of the vehicle body, extends to the front of the vehicle body, penetrates the inner cylinder of the other mounting portion of the control link 14, and a nut 24 is screwed to the tip portion thereof. By doing so, the other end of the control link 14 is swingably attached to the axle beam 3 via the attachment pin 22.

In the lateral link structure having the above-mentioned structure, the lateral force input to the axle beam 3 via the wheel 2 is transmitted from the vehicle body side mounting portion of the lateral link 7 and the vehicle body side mounting portion of the control link 14 to each link. 7 and 14, the force input to the vehicle body side mounting portion of the lateral link 7, that is, the force directed in the axial direction is absorbed by the lateral displacement absorbing member 10 bending laterally by a predetermined amount. It is hardly transmitted to the lateral link 7.

Further, the force transmitted to the control link 14 is transmitted to the lateral link 7 via the coupling portion with the lateral link 7, and between the coupling portion of the lateral link 7 and the vehicle body side mounting portion. A lateral force input from the wheel 2 is supported by generating a compressive force or a tensile force, and lateral fluctuation of the axle beam 3 with respect to the vehicle body is restricted.

In the link structure as described above, when the wheel 2 is bound and rebounded, the lateral link side mounting portion of the control link 14 draws a locus centered on the axle beam side mounting portion. On the other hand, assuming that the length between the mounting portions of the lateral link 7 is constant, the control link 14 on the lateral link 7 is
The side mounting portion tries to draw a locus around the axle side mounting portion of the lateral link 7, and a displacement occurs between both loci. This displacement is not provided at the position of the axle mounting portion of the lateral link 7. The rubber bush 10b of the lateral displacement absorbing member 10 being bent is absorbed by being bent in the lateral direction.

Since the above-mentioned link structure is a one-point support on the vehicle body side and two-point support on the axle side, the positional relationship of the axle beam 3 supported at two points is maintained and the lateral movement of the axle beam 3 is restricted. It The lateral displacement absorbing member 10 absorbs the displacement by bending the rubber bush 10b away from the lateral link 7 when bounding or rebounding from the normal position.
As shown in, in this embodiment, in the normal position,
Since the inner cylinder 10c is set to be closer to the lateral link 7 side by x, the center axis of the inner cylinder 10c passes the center axis of the outer cylinder 10a during the bouncing / rebounding, that is, A in FIG. Alternatively, at the position B, the rubber bush 10b
Moves in a direction away from the lateral link 7 through a position where the flexure of the is neutral.

As a result, the diameter of the outer cylinder 10a can be set smaller than before, and the lateral displacement absorbing member 10 can be downsized. Further, at the time of the bouncing / rebounding, the inner cylinder 10c is movable by ε relative to the outer cylinder 10a as shown in FIG. 5, but in the normal state, the rubber bush 10b is previously moved by x. It is set to be bent to the other side. Therefore, for example, if the above-mentioned x is set to (ε / 2), the rubber bush 10b
Is approximately half (ε / 2), which is about half the relative movement amount ε of the inner cylinder 10c. Even if the lateral displacement absorbing member 10 is downsized, the rubber bush 10 can have a predetermined strength. it can.

In the assembling of the links 7 and 14 as described above, first, the lateral link 7 is located above the axle beam 3 at a position where the outer cylinder 10a and the inner cylinder 10c of the lateral displacement absorbing member 10 are coaxial. In a state in which the lateral link 7 is inclined, the axle-side end of the lateral link 7 is assembled via the lateral displacement absorbing member 10 to be temporarily tightened by the mounting pin 9, and the control link 14 disposed in the lateral link 7 Both end portions of each are also temporarily attached to the lateral link 7 and the axle beam 3 by the attachment pins 20 and 23.

Next, the lateral link 7 is pivoted to bring the shaft to a horizontal position, the rubber bush 10b of the lateral displacement absorbing member 10 is bent toward the lateral link 7, and in that state, the temporarily tightened mounting pin 9, Fully tighten 20, 23. As a result, when the lateral link 7, which is the normal position, is horizontal, a twist that is biased in the vertical direction is input to the rubber bush 14f provided at the end of the control link 14 and the like for absorbing swing. Is prevented.

[0037]

As described above, in the link structure of the suspension of the present invention, the lateral displacement absorbing member interposed between the lateral link and the axle beam can be downsized.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a link structure according to an embodiment of the present invention.

FIG. 2 is a rear view showing the suspension provided with the link structure of the embodiment according to the present invention.

FIG. 3 is a plan view showing a suspension provided with a link structure according to an embodiment of the present invention.

FIG. 4 is a side view showing a lateral link according to an embodiment of the present invention.

FIG. 5 is a schematic view showing the operation of the lateral displacement absorbing member in the link structure according to the present invention.

FIG. 6 is a schematic diagram showing an operation of a lateral displacement absorbing member in a conventional link structure.

[Explanation of symbols]

 3 Axle beam 5 Body side member 7 Lateral link 9, 20, 23 Mounting pin 10 Lateral displacement absorbing member 10a Outer cylinder 10b Rubber bush 10c Inner cylinder 14 Control link

Claims (2)

[Claims] 1. A lateral link having one end connected to an axle beam through a lateral displacement absorbing member and extending in the vehicle width direction, and the other end connected to a vehicle body side member, and a longitudinal intermediate position of the lateral link and an axle. The lateral displacement absorbing member comprises a rubber bush having low rigidity in the vehicle width direction between an outer cylinder and an inner cylinder arranged with their axes oriented in the vehicle front-rear direction. In the link structure of the suspension in which the inner cylinder is fixed to the axle beam side and the outer cylinder is fixed to the lateral link side, at a position where the lateral link is horizontal or almost horizontal. A link structure for a suspension, wherein the center axis of the inner cylinder is set to be offset to the lateral link side with respect to the center axis of the outer cylinder. 2. The suspension according to claim 1, wherein a lateral displacement absorbing member is used in which a rubber bush is set so that the central axes of the outer cylinder and the inner cylinder are coaxial or substantially coaxial when no load is applied. In the link structure, at the position where the inner cylinder and the outer cylinder of the lateral displacement absorbing member are coaxial or substantially coaxial, one end of the axle beam and the lateral link is temporarily assembled via the lateral displacement absorbing member and the lateral link is formed. It is characterized in that after temporarily assembling the control link with the axle beam, the lateral link is moved to a horizontal or substantially horizontal position to permanently tighten the pivot points of the temporarily assembled links. Suspension link assembly method.