JPH07257131A - Leaf spring attaching structure - Google Patents

Abstract

PURPOSE:To prevent a surge from being transmitted from a leaf spring to a vehicle body with no large structural change. CONSTITUTION:A lower link 3 coupled at its outer end to the lower part of an axle 2 to which a wheel 1 is rotatably supported, extends widthwise of a vehicle body 7, having its inner end coupled to the vehicle body 7 through the intermediary of a lower bushing 4. A leaf spring 8 extends underneath the vehicle body 7, widthwise of the latter, and is connected at its one end to an intermediate part of the lower link 3 in the vehicle widthwise direction, through the intermediary of a vertically extending connecting rod 9. The outer cylinder of the lower bushing 4 is coupled to the leaf spring 8 through the intermediary of an insulator 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leaf spring mounting structure in a vehicle suspension equipped with a laterally mounted leaf spring.

[0002]

2. Description of the Related Art A conventional leaf spring mounting structure for a vehicle suspension provided with a laterally mounted leaf spring is disclosed in, for example, Japanese Unexamined Patent Publication No. 4-243607.
Some are described in Japanese Patent Publications. This is a lower link which is one of suspension links extending substantially in the vehicle width direction between a suspension member that constitutes a vehicle body side member elastically supported by the vehicle body and a wheel support member that rotatably supports a wheel. Is connected so that it can swing vertically, and both ends of leaf springs that are laterally placed in the vehicle width direction are elastically supported by the suspension links so that they can swing vertically, respectively, via insulators. Has been done.

Further, a pivot rubber made of a rubber elastic body is provided so as to project upward on the inner surface in the vehicle width direction at the end portion of the leaf spring, and the pivot rubber in the suspension member which is a vehicle body side member is In a vertically opposed position, a concave pivot engagement member engageable with the pivot portion of the pivot rubber is provided so as to protrude downward, and the pivot engagement member is in contact with the pivot rubber portion. Therefore, the leaf spring is attached.

In the suspension to which the leaf spring is attached as described above, the weight (spring load) of the vehicle body from the suspension member via the pivot engaging member and the pivot rubber when the vehicle is stationary or in a straight traveling state. Is input to the leaf spring and supported by the leaf spring. Also, when the vehicle is turning, the vehicle body reaction force acting on the pivot rubber increases on the sinking side (bound side) of the vehicle body due to rolling,
The body reaction force acting on the pivot rubber is reduced on the floating side (rebound side) of the vehicle body.

The action of the pivot rubber is transmitted to the leaf spring with the connecting point of the pivot rubber attachment portion as the action point and the left and right insulator attachment positions as fulcrums. As a result, the end portions of the leaf springs are respectively bent and deformed in the vertical direction, and act as stabilizers based on the spring action to maintain the vehicle posture during turning in a stable state.

In the above-mentioned conventional example, the end portion of the leaf spring is connected to the upper surface side of the lower link by an insulator. For example, as shown in FIG. The extending connecting rod 61 connects the end portions of the leaf springs 62, and the vehicle body side mounting portion is not separated into the pivot engaging member and the pivot rubber as in the above-described conventional example, and the pivot insulator 63 as shown in FIG. There is also a conventional example of a leaf spring mounting structure in which the vehicle body 64 and the leaf spring are directly connected.

However, the operation and effect are similar to those of the above conventional example.

[0008]

However, in the leaf spring mounting structure having the above structure, the leaf spring also functions as a stabilizer as described above.
When the leaf spring bends, the twist is input to the pivot rubber or the pivot insulator used for attachment to the vehicle body.

For this reason, when the pivot insulator 63 as shown in FIG. 9 is used, the pivot insulator 63 is firmly attached to the leaf spring 62 and the vehicle body side 64 with a rigidity sufficient to resist the twisting force. Need to be fixed. In addition, JP-A-4-2436
When connecting with a pivot rubber and a pivot engaging member as described in Japanese Patent Publication No. 07, etc., the engaging surface is precisely processed so as to minimize mutual swinging between both members. Therefore, it is necessary to form the engaging surfaces of the two so as to slidably adhere to each other.

Further, since the load on the spring of the vehicle is received by the pivot rubber or the insulator for the pivot, the rigidity of the pivot rubber or the insulator for the pivot is inevitably increased, and the surge of the leaf spring is transmitted to the vehicle body side. It is easy to be done. In order to prevent this, it is preferable to perform double vibration isolation, but for that purpose, a large structural change is required such as interposing a member such as a subframe between the leaf spring and the vehicle body.

The present invention has been made by paying attention to the above-mentioned problems, and without making a large structural change,
An object of the present invention is to provide a leaf spring mounting structure capable of preventing the surge of the leaf spring from being transmitted to the vehicle body.

[0012]

In order to achieve the above object, the leaf spring mounting structure of the present invention as set forth in claim 1 is arranged on both left and right sides of a vehicle body and extends substantially in the vehicle width direction. Both end sides of leaf springs extending in the vehicle width direction are respectively attached to wheel side end portions of a connecting member that connects a wheel support member that rotatably supports wheels and a vehicle body-side member so as to be vertically swingable. In a leaf spring mounting structure having connecting points to be connected, the leaf spring is connected to the connecting member at a plurality of connecting points along the vehicle width direction.

At this time, as described in claim 2, it is preferable that one of the plurality of connecting points of the leaf spring and the connecting member is set to the vehicle body side attachment point position of the connecting member. Further, as set forth in claim 3, the leaf spring is supported by the vehicle body side member via an elastic member, and the elastic member is set to have high rigidity in the vehicle width direction and low rigidity in the vertical direction. It is characterized by

The leaf spring mounting structure of the present invention as set forth in claim 4 is arranged on both left and right sides of the vehicle body,
Extending in the vehicle width direction on the wheel side end portion side of a connecting member that extends substantially in the vehicle width direction and that connects a wheel supporting member that rotatably supports a wheel and a vehicle body side member so as to be swingable in the vertical direction. Both ends of the leaf spring are connected to each other by elastic members that are continuous for a predetermined length along the vehicle width direction from the connection point in the leaf spring mounting structure having connection points that are connected to each other.

The leaf spring mounting structure according to the present invention is characterized in that the leaf spring is not directly mounted on the vehicle body side member.

[0016]

According to the present invention, when the connecting member and the end portion of the leaf spring are connected at a plurality of positions with a predetermined space in the vehicle width direction, some of the plurality of connecting points form an operating point and Some of the plurality of connecting points form a fulcrum, and a vertical bending moment can be input to the end portion of the leaf spring extending in the vehicle width direction.

Therefore, the sprung load is transmitted from the vehicle body side member to the leaf spring through the connecting member and can be supported by the leaf spring. At this time, since the bending direction of the end portion of the leaf spring is the same as the turning direction of the connecting member, the twist input to the connecting member interposed at each connecting point between the two is small.

At this time, as described in claim 2, by setting one of the connecting points to the vehicle body side attachment point position of the connecting member, the connecting point constitutes an action point. Therefore, the sprung load is input from the vehicle body side member to the leaf spring via the vehicle body side member of the connecting member. In this case, as described in claim 3, when the rigidity is set to be high in the vehicle width direction and low in the vertical direction, the leaf spring is elastically supported by the vehicle body side member. Good.

By doing so, the lateral swing displacement of the leaf spring can be suppressed within a predetermined allowable range, and
Since the rigidity of the connecting portion to the vehicle body in the vertical direction is low, the surge of the leaf spring is prevented from being input from the supporting portion. Further, as described in claim 4, when the connecting member and the end portion of the leaf spring are continuously connected by the elastic member for a predetermined distance in the vehicle width direction, the end portion of the leaf spring and the connecting member form the elastic member. Since it has a structure in which the suspensions are connected substantially integrally with each other, the end portions of the leaf springs are also bent in the same direction as the suspension is swung in the vertical direction.

Therefore, the sprung load is transmitted from the vehicle body to the leaf spring via the connecting member and the elastic member and can be supported by the leaf spring. Also at this time, since the bending direction of the end portion of the leaf spring is the same as the turning direction of the connecting member, the twisting force applied to the elastic member is small. In this way, the on-spring load can be supported by the leaf spring via the connecting member.
As described above, it is not necessary to elastically support the leaf spring directly on the vehicle body.

Further, since the bush is normally provided in the vehicle body side mounting portion of the connecting member, the bush can reduce the transmission to the vehicle body even if the surge of the leaf spring is input to the connecting member. . Further, when a connecting rod or the like is used to connect the connecting member and the leaf spring, the leaf spring may have large swing displacement in the vehicle width direction.

[0022]

Embodiments of the present invention will be described with reference to the drawings.
First, the structure will be described. As shown in FIG. 1, a wheel 1 is rotatably supported by an axle 2 which is a wheel supporting member. An outer end of a lower link 3, which is a connecting member, is swingably connected to a lower portion of the axle 2 via a ball joint or the like, and the lower link 3 extends inward in the vehicle width direction.

The inner end of the lower link 3 is connected to the vehicle body 7 via a lower bush 4 so as to be vertically swingable. The lower bush 4 is configured such that an outer cylinder and an inner cylinder are arranged substantially coaxially, and a bush main body made of a rubber elastic body is interposed between the both cylinders. The shaft is disposed in the front-rear direction of the vehicle body, the outer cylinder is integrally fixed to the lower link 3 side, and the inner cylinder is fixed to the vehicle body 7 by bolting or the like.

The outer end of the upper link 5 is swingably connected to the upper portion of the axle 2 via a ball joint or the like, and the upper link 5 extends inward in the vehicle width direction. An inner end portion of the upper link 5 is fixed to a vehicle body 7 via an upper bush 6 so as to be vertically swingable. The upper bush 6 is also the lower bush 4 described above.
Similarly, the outer cylinder and the inner cylinder are arranged substantially coaxially, and a bush main body made of a rubber elastic body is interposed between both cylinders. The shaft is arranged in the front-rear direction of the vehicle body 7, the outer cylinder is integrally fixed to the lower link 3 side, and the inner cylinder is fixed to the vehicle body 7 by bolting or the like.

Leaf springs 8 extend below the vehicle body 7 in the vehicle width direction, and both ends thereof are connected to the left and right lower links 3, respectively. Explaining the mounting structure of the end portion of the leaf spring 8 to the lower link 3,
First, the middle portion of the lower link 3 in the vehicle width direction and the end portion of the leaf spring 8 are swingably connected by a vertically extending connecting rod 9.

Further, at the position of the leaf spring 8 which opposes the mounting portion of the lower bush 4 in the vertical direction, as shown in FIG.
As shown in, the insulator 1 having a predetermined elastic force
0 is attached. The insulator 10 is
It comprises a rubber elastic body 10a fixed so as to cover the entire outer surface of the leaf spring 8, and an upper plate 10b and a lower plate 10c fixed to the upper and lower surfaces of the rubber elastic body 10a. Further, a pair of bolt mounting holes 11 are formed to vertically penetrate both the insulator 10 and the leaf spring 8.

The insulator 10 may be attached to the leaf spring 8 in advance by vulcanization bonding or the like, or may be fitted later by fitting the insulator 10 to the leaf spring 8. Further, as shown in FIG. 3, the lower bush 4 is
Two stud bolts 12 project downward from the lower part of the outer cylinder 4a, and the two stud bolts 12 are
However, the inner ends of the lower links 3 are connected to the leaf springs 8 by penetrating the bolt mounting holes 11 and screwing the nuts 13 into the bolts.

In this embodiment, as shown in FIG.
Although the lower surface of the lower bush 4 is formed to have a flat surface, it does not necessarily have to be a flat surface and may have a cylindrical shape. Further, in the drawing, 14 is a washer. Further, in the above embodiment, the leaf spring 8 is illustrated as being composed of one spring plate,
As in the conventional case, a stacked spring plate structure having a plurality of stacked spring plates may be used. In this case, the insulator 10 may be configured by interposing a rubber elastic body between the grip band used for bundling the spring plates and the outer peripheral surface of the spring plate.

As a result, the connecting portion via the insulator 10 is elastically supported by the lower bush 4 in a state in which lateral displacement is restricted by the bolt mounting hole 11 and the stud bolt 12. Here, in the following description, the connection point via the connecting rod 9 will be referred to as the first
The connection point A and the connection point via the insulator 10 are second
The connection point B will be described below.

In the suspension to which the leaf spring 8 is attached as described above, the weight of the vehicle body 7, that is, the sprung load is supported by the leaf spring 8 from the vehicle body 7 through the lower bush 4. Then, for example, when both the left and right wheels bounce, as shown in FIG. 4, the left and right lower links 3 swing upward about the vehicle body 7 side attachment portion, so that the second connection point B is acted. The leaf spring 8 bends upward with the first connection point A as a fulcrum, and upward loads F _{1 and} F ₄ are input to the left and right first connection points A, and the left and right second connection points B are respectively input. The downward loads F _{2 and} F ₃ are input. Then,
A spring force corresponding to the amount of the flexure is generated in the leaf spring 8 to buffer the vibration and impact due to the bounce and stabilize the posture of the vehicle body.

When the vehicle swings and one wheel rebounds and the other wheel bounces, as shown in FIG. 5, on the bounding side, the lower link 3 swings upward similarly to the above. Then, with the second connection point B as the point of action and the first connection point A as the fulcrum, the upward load F ₈ is input to the first connection point A and the downward load F ₇ is applied to the second connection point B. When input, the leaf spring 8 bends upward. on the other hand,
On the rebound side, the lower link 3 swings downward, and a downward load F ₅ is input to the first connection point A with the second connection point B as the point of action and the first connection point A as the fulcrum. Two
An upward load F ₆ is input to the connection point B, and the leaf spring 8 bends downward.

As a result, a spring force corresponding to the amount of flexure is generated at the left and right ends of the leaf spring 8 to cushion vibrations and shocks and to act as a stabilizer to stabilize the posture of the vehicle body. At this time, even if a load is input and the leaf spring 8 bends in the vertical direction and a surge occurs in the leaf spring 8, the surge is directly transmitted to the vehicle body 7.
Is transmitted to the vehicle body 7 via the lower link 3 and the lower bush 4 without being input to
The "rough feeling" input to the occupant is reduced compared to the past.

Further, since the bending direction of the end portion of the leaf spring 8 and the swinging direction of the lower link 3 are synchronized with each other, the twist of the insulator 10 is significantly reduced, and the inexpensive insulator 10 is used. It becomes possible to do. Next, a second embodiment will be described with reference to the drawings. As shown in FIG. 6, the structure of the second embodiment is such that the wheel 20
Is rotatably supported by an axle 21 which is a wheel support member, and an outer end portion of a lower link 22 is swingably connected to a lower portion of the axle 21 via a ball joint or the like.

The lower link 22 extends inward in the vehicle width direction, and its inner end portion is fixed to the vehicle body 237 via the lower bush 24 so as to be vertically swingable. The lower bush 24 is configured such that an outer cylinder and an inner cylinder are arranged substantially coaxially, and a bush main body made of a rubber elastic body is interposed between the both cylinders. The shaft is arranged in the front-rear direction of the vehicle body 23, the outer cylinder is integrally fixed to the lower link 22 side, and the inner cylinder is fixed to the vehicle body 23 by bolting or the like.

The outer end of the upper link 25 is swingably connected to the upper portion of the axle 21 via a ball joint or the like, and the upper link 25 extends inward in the vehicle width direction. An inner end portion of the upper link 25 is fixed to the vehicle body 23 via an upper bush 26 so as to be vertically swingable.

Like the lower bush 24, the upper bush 26 has an outer cylinder and an inner cylinder arranged substantially coaxially, and a bush main body made of a rubber elastic body is interposed between the both cylinders. Has been done. The shaft is arranged in the front-rear direction of the vehicle body 23, the outer cylinder is integrally fixed to the lower link 22 side, and the inner cylinder is fixed to the vehicle body 23 by bolting or the like.

The leaf spring 27 is attached to the vehicle body 23.
It extends downward and extends in the vehicle width direction, and both ends thereof are connected to the left and right lower links 22, respectively. The attachment structure of the end portion of the leaf spring 27 to the lower link 22 will be described. The midway position of the lower link 22 in the vehicle width direction and the end portion of the leaf spring 27 are connected to a first connecting rod 28 extending vertically. The lower link 22 and the end portion of the leaf spring 27 are connected by a second connecting rod 29 extending vertically at a position inward of the vehicle width direction with respect to the connection point.

Further, the central position of the leaf spring 27 in the longitudinal direction is elastically supported on the lower surface of the vehicle body 23 via the insulator 30. The insulator 30 is provided with the curls 30a at the upper and lower positions sandwiching the leaf spring 27, so that the rigidity in the vertical direction is set to be low.
Further, the rigidity of the main body of the insulator 30 is set high, so that the rigidity in the lateral direction is set high.

Here, in the following description, the connecting point via the first connecting rod 28 will be referred to as the first connecting point C.
The connection point via the second connecting rod 29 will be referred to as a second connection point D for description. In the second embodiment, the weight of the vehicle body 23, that is, the sprung load, is
The lower spring bush 24, the lower link 22, and the two connecting rods 28, 29 support the leaf spring 27.

At this time, the load is directly transmitted from the vehicle body 23 to the insulator 30, but since the insulator 30 has a low vertical rigidity, the insulator 30 is absorbed by bending in the vertical direction. Therefore, almost no input is made at the center of the leaf spring 27. Then, for example, when the vehicle swings and one wheel rebounds and the other wheel bounces, the bound side is
The lower link 22 swings upward, and one of the first connection point C and the second connection point D is used as an action point and the other is used as a fulcrum, and an upward load is input to the first connection point C and the second connection point is connected. A downward load is input to the point D, and the leaf spring 27 bends upward. On the rebound side, the lower link 22 swings downward, and a downward load is input to the first connection point C with one of the first connection point C and the second connection point D as an action point and the other as a fulcrum. At the same time, the upward load is input to the second connection point D, and the leaf spring 27 bends downward.

Incidentally, each connecting rod 28, 29
Since it can swing laterally, the insulator 3
If there is no zero, the leaf spring 27 is largely oscillated and displaced in the left-right direction, but since the insulator 30 has high rigidity in the lateral direction, the displacement in the lateral direction is restricted. In addition, since the vertical displacement of the leaf spring 27 in the vicinity of the central portion of the vehicle during swinging is usually small, the vertical displacement generated in the insulator 30 is kept small.

As a result, a spring force corresponding to the amount of bending is generated at the left and right ends of the leaf spring 27 to cushion vibrations and impacts and stabilize the posture of the vehicle body. At this time, even if a load is input and the leaf spring 27 bends in the vertical direction and a surge occurs in the leaf spring 27, the surge is transmitted to the vehicle body 23 via the lower link 22 and the lower bush 24. Therefore, double vibration isolation is performed, and the “rough feeling” input to the occupant is reduced compared to the conventional case.

At this time, the surge generated in the leaf spring 27 is also transmitted to the insulator 30, but the vertical component (the main component of the surge) is absorbed by the insulator 30 and transmitted to the vehicle body 23. Transmission is greatly reduced. In addition, the leaf spring 27
Since the bending direction of the end portion and the swinging direction of the lower link 22 are synchronized in the same direction, the twist generated in the insulator 30 is significantly reduced, and the inexpensive insulator 30 is used.
Can be used.

In the above description, the lower surface of the vehicle body 23 and the central portion of the leaf spring 27 are combined into one insulator 30.
However, a structure in which the vicinity of the central portion of the leaf spring 27 and the lower surface of the vehicle body 23 are connected by a pair of insulators 30 provided at symmetrical positions in the vehicle width direction may be used. Further, in the above embodiment, the lower link 22 and the end of the leaf spring 27 are connected by the two connecting rods 28 and 29 along the vehicle width direction. However, three or more connecting rods are connected along the vehicle width direction. You may connect with a rod.

Next, a third embodiment will be described. Third
Explaining the configuration of the embodiment, as shown in FIG.
0 is rotatably supported by an axle 41 which is a wheel support member, and an outer end portion of a lower link 42 is swingably connected to a lower portion of the axle 41 via a ball joint or the like. The lower link 42 extends inward in the vehicle width direction, and its inner end portion is connected to the vehicle body 4 via a lower bush 44.
It is fixed to 3 so as to be swingable in the vertical direction.

The lower bush 44 has an outer cylinder and an inner cylinder arranged substantially coaxially with each other, and a bush main body made of a rubber elastic body is interposed between the both cylinders. The shaft is arranged in the front-rear direction of the vehicle body 43, the outer cylinder is integrally fixed to the lower link 42 side, and the inner cylinder is fixed to the vehicle body 43 by bolting or the like. Also,
An outer end portion of an upper link 45 is swingably connected to the upper portion of the axle 41 via a ball joint or the like, and the upper link 45 extends inward in the vehicle width direction.

The inner end portion of the upper link 45 is fixed to the vehicle body 43 via an upper bush 46 so as to be vertically swingable. Similar to the lower bush 44, the upper bush 46 is also configured such that the outer cylinder and the inner cylinder are arranged substantially coaxially, and a bush main body made of a rubber elastic body is interposed between the both cylinders. . The shaft is arranged in the front-rear direction of the vehicle body 43, the outer cylinder is integrally fixed to the lower link 42 side, and the inner cylinder is fixed to the vehicle body 43 by bolting or the like.

Further, the leaf spring 47 is attached to the vehicle body 43.
It extends downward in the vehicle width direction, and both ends thereof are connected to the left and right lower links 42, respectively. The structure for attaching the end portion of the leaf spring 47 to the lower link 42 will be described. As shown in FIG. 8, the insulator is continuously provided above the end portion of the leaf spring 47 for a predetermined length in the vehicle width direction. 48 is fixed.

The insulator 48 is an insulator main body 4 made of a rectangular rubber elastic body fixed to the upper surface of the end portion of the leaf spring 47 by vulcanization adhesion.
8a and an upper plate fixed to the upper portion of the insulator 48, and a stud bolt 49 projects upward from the upper plate 48b. The lower link 42 is provided with a mounting hole through which the stud bolt 49 can penetrate, and the stud bolt 49 penetrates through the mounting hole and a nut 50 is screwed onto the upper end of the mounting hole. In FIG. 8, 51 is a spring washer.

In the third embodiment, the weight of the vehicle body 43, that is, the sprung load is supported by the leaf spring 47 from the vehicle body 43 through the lower bush 24, the lower link 42, and the insulator 48. And, for example,
When the vehicle swings and one wheel rebounds and the other wheel bounces, the bound side is the lower link 42.
Swings upward, the end of the leaf spring 47 is pulled upward via the insulator 48, and the end of the leaf spring 47 bends upward. Also, on the rebound side,
The lower link 42 swings downward, the end of the leaf spring 47 is pushed downward via the insulator 48, and the end of the leaf spring 47 bends downward.

As a result, spring forces corresponding to the amount of deflection are generated at the left and right ends of the leaf spring 47, respectively, to cushion vibrations and shocks and stabilize the posture of the vehicle body 43. At this time, the load is input and the leaf spring 47
Even when the leaf spring 47 bends in the vertical direction and a surge occurs in the leaf spring 47, the surge is transmitted to the vehicle body 43 through the insulator 48, the lower link 42, and the lower bush 44. As a result, the “rough feeling” input to the occupant is reduced compared to the conventional case.

Further, in this embodiment, the insulator 4
The load is input only to the lower link 42 in the swinging direction of the lower link 42, and the bending direction of the end of the leaf spring 47 and the swinging direction of the lower link 42 are synchronized in the same direction. The inexpensive insulator 48 can be used without any twisting.

In the above embodiment, the leaf spring 4
The reason why the bolt joint is not adopted as a method of attaching the insulator 48 to the 7 is that, in recent years, resin such as GFRP is often used for the leaf spring 47 in order to reduce the weight, and the leaf spring 47 has a hole or the like. This is because when processing the, it becomes necessary to deal with stress concentration and the like. Further, in the second and third embodiments, the leaf springs 27, 4
Although 7 is shown as being composed of a single spring plate, it may of course be a leaf spring.

Further, in all the above embodiments, the lower link 3,
Although the leaf springs 8, 27, 47 end portions are connected to the lower portions of 22, 42, the leaf springs 8, 27, 47 end portions may be connected to the upper portions of the lower links 3, 22, 42.

[0055]

As described above, in the leaf spring mounting structure of the present invention, as described in claims 1 and 4, each end portion of the leaf spring is
By connecting to the connecting member at a plurality of positions in the vehicle width direction or by continuously connecting a predetermined length in the vehicle width direction, it is possible to support the sprung load on the leaf spring via the connecting member.

Therefore, as described in claim 5, it is not necessary to support the leaf spring directly on the vehicle body for supporting the sprung load. At this time, when one of the connection points is taken at the vehicle body side mounting portion of the connecting member, the sprung load is provided from the vehicle body to the vehicle body side mounting of the connecting member via the bush. Since it is input to the leaf spring, only a bending moment equivalent to that when the leaf spring is elastically supported directly on the vehicle body as in the conventional case is added to the connecting member.

Therefore, the leaf spring is coupled to the vehicle body in a double vibration-proof state without increasing the rigidity of the coupling member. Further, at this time, the swinging direction of the connecting member and the bending direction of the leaf spring end portion are displaced in the same direction in synchronization with each other, so that the twisting input to the connecting member connecting the both is small.

Also, by elastically supporting the leaf spring on the vehicle body as described in claim 3, the lateral swing of the leaf spring is restricted. Since this elastic support portion is set to have low rigidity in the vertical direction, it hardly transmits the load from the vehicle body to the leaf spring,
Moreover, the surge generated in the leaf spring is not transmitted to the vehicle body side.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram showing a leaf spring mounting structure of a first embodiment according to the invention as seen from the front of a vehicle.

FIG. 2 is a partially broken configuration diagram showing a second connection point portion in the leaf spring mounting structure of the first embodiment according to the present invention.

FIG. 3 is an exploded view showing a second connecting point portion in the leaf spring mounting structure of the first embodiment according to the present invention.

FIG. 4 is a diagram showing a state when the left and right wheels are bound in the leaf spring mounting structure according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a state where one wheel is bound and the other wheel is rebound in the leaf spring mounting structure of the first embodiment according to the present invention.

FIG. 6 is a configuration diagram of a main part of a leaf spring mounting structure according to a second embodiment of the present invention as viewed from the front of the vehicle.

FIG. 7 is a configuration diagram of a main part of a leaf spring mounting structure according to a third embodiment of the present invention as viewed from the front of the vehicle.

FIG. 8 is an exploded view of a connecting point portion in a leaf spring mounting structure according to a third embodiment of the present invention.

FIG. 9 is a main part configuration diagram showing a conventional leaf spring mounting structure as seen from the front of the vehicle.

FIG. 10 is a view showing a pivot insulator in a conventional leaf spring mounting structure.

[Explanation of symbols]

 1 Wheel 2 Axle (Wheel Supporting Member) 3 Lower Link (Connecting Member) 4 Lower Bushing 7 Car Body 8 Leaf Spring 9 Connecting Rod 10 Insulator (Elastic Member) A 1st Connecting Point B 2nd Connecting Point 20 Wheel 21 Axle (Wheel) Support member 22 Lower link (connecting member) 23 Vehicle body 24 Lower bush 27 Leaf spring 28 First connecting rod 29 Second connecting rod 30 Insulator C First connecting point D Second connecting point 40 Wheel 41 Axle (wheel supporting member) 42 Lower Link (Coupling Member) 43 Vehicle Body 44 Lower Bushing 47 Leaf Spring 48 Insulator

Claims (5)

[Claims] 1. A connecting member which is arranged on both left and right sides of a vehicle body, extends substantially in the vehicle width direction, and connects a wheel supporting member for rotatably supporting a wheel and a vehicle body side member so as to be vertically swingable. In the leaf spring mounting structure, in which both end sides of the leaf spring extending in the vehicle width direction have connection points respectively connected to the wheel side end side of the vehicle, the leaf spring is attached to the connection member in the vehicle width direction. Leaf spring attachment structure characterized by being connected at a plurality of connection points along the. 2. The leaf spring according to claim 1, wherein one of a plurality of connecting points between the leaf spring and the connecting member is set to a vehicle body side attachment point position of the connecting member. Mounting structure. 3. The leaf spring is supported by a vehicle body side member via an elastic member, and the elastic member is set to have high rigidity in a vehicle width direction and low rigidity in a vertical direction. The leaf spring mounting structure according to claim 1 or 2. 4. A connecting member which is arranged on both left and right sides of a vehicle body, extends substantially in the vehicle width direction, and connects a wheel supporting member for rotatably supporting a wheel and a vehicle body side member so as to be vertically swingable. In a leaf spring mounting structure in which both end sides of a leaf spring extending in the vehicle width direction have connection points respectively connected to the wheel side end portion of the vehicle, a predetermined length from the connection point in the vehicle width direction. A leaf spring mounting structure characterized by being connected by a continuous elastic member. 5. The leaf spring mounting structure according to claim 1, wherein the leaf spring is not directly mounted on the vehicle body side member.