JP2018001898A - Torsion beam type suspension and trailing arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsion beam type suspension or the like provided with a trailing arm capable of naturally discharging rainwater or dusts that have entered the trailing arm configured to be hollow in a 1G state.SOLUTION: This torsion beam type suspension is provided with: a trailing arm which is hollow in section and in which left and right constitute a pair; and a torsion beam that is fixed at one end and the other end to the trailing arm. The trailing arm is provided with, at one end, an opening that is connected to the hollow part. The shape of the bottom surface of the trailing arm is provided with a slope inclined downward from the other end to the opening in a 1G state. The slope functions as a path for guiding water entered inside to the opening. The opening functions as a discharge hole for discharging the water from the trailing arm.SELECTED DRAWING: Figure 1

Description

The present invention relates to a torsion beam suspension and a trailing arm used therefor.

The torsion beam suspension is mainly used for the rear wheel of a front-wheel drive vehicle. A torsion beam, which is a long member, is fixed between a pair of left and right trailing arms. Wheels are supported on the trailing arm. When the wheel is displaced by road surface unevenness or the like, the torsion beam is twisted or deflected to be elastically deformed to allow the trailing arm and the wheel supported thereon to be displaced. When the road surface becomes flat, the torsion beam returns to its original shape, and the trailing arm and wheels are returned to their original positions.

For example, Patent Document 1 describes a torsion beam suspension in which the cross-sectional shape of the torsion beam is changed in one step or multiple steps in a direction away from the arm. FIG. 1 shows a trailing arm having an opening at the end on the shock absorber side.

Patent Document 2 describes a torsion beam type suspension including an arch-shaped torsion beam that protrudes forward and upward in an inclined manner. FIG. 8 shows a trailing arm having an opening at the end on the shock absorber side, as in Patent Document 1.

Patent Document 3 describes a trailing arm in which an arch structure portion is provided at a coupling portion between a trailing arm and an end plate. This structure is said to reduce the concentration of stress generated in the welded portion between the trailing arm and the hub unit coupling member.

JP 2001-39135 A Japanese Patent Laying-Open No. 2015-174641 JP 2013-023150 A

In the trailing arm of Patent Document 1, the opening on the shock absorber side faces upward. For this reason, there is a possibility that water and dust may accumulate inside the trailing arm. In the torsion beam type suspension of Patent Document 2, the cross-sectional shape of the lower half of the arch is inclined forward and downward when in the full bound state, so that water or the like can be prevented from staying inside the opening of the torsion beam. However, when the torsion beam type suspension is attached to the vehicle body to be in the 1G state, the use of the opening at the end of the trailing arm as a drain hole is not described.

In the torsion beam suspension of Patent Document 3, an opening is provided on the side surface on the rear side of the vehicle. However, when the torsion beam type suspension is attached to the vehicle body to be in the 1G state, the use of the opening at the end of the trailing arm as a drain hole is not described.

When the vehicle is stopped while the tire is in contact with the ground, the suspension and the damper are contracted to some extent by the gravity of 1G, and the wheel approaches the wheel house of the vehicle body. This is referred to as a 1G state. When the vehicle body is lifted up for vehicle maintenance or when the vehicle decelerates, the suspension is extended to some extent, but when the vehicle is stored, it is normally in the 1G state.

Although it is conceivable to make the trailing arm and other parts hollow to reduce the weight of the vehicle parts, there is a concern that rainwater, dust, etc. may accumulate inside the trailing arm and cause corrosion. The In particular, if the vehicle is stored in a state where rainwater or the like is accumulated in the trailing arm, the metal member is exposed to rainwater or the like for a long time, and corrosion is likely to occur.

In view of the above points, in the present invention, a torsion beam type equipped with a trailing arm that can naturally discharge rainwater, dust and the like that has entered the inside of a trailing arm configured to be hollow in the 1G state. An object is to provide a suspension and a trailing arm.

A torsion beam suspension having a pair of left and right trailing arms having a hollow cross section and a torsion beam having one end and the other end fixed to the trailing arm. The trailing arm communicates with the hollow portion. The opening of the trailing arm is provided with an inclined portion that descends toward the opening from the other end side in the 1G state, and the inclined portion allows water that has entered the interior to the opening. The above problem is solved by a torsion beam type suspension that functions as a guiding path and the opening functions as a drainage hole for discharging water in the trailing.

Furthermore, the cross section is hollow, and an opening communicating with the hollow portion is provided on one end side thereof, and the shape of the bottom surface is provided with an inclined portion that descends from the other end side toward the opening on the one end side in the 1G state. Yes, the inclined part functions as a path for guiding the water that has entered the interior to the opening, and the opening solves the above problem by the trailing arm for the torsion beam suspension that functions as a drainage hole for discharging the water in the trailing arm. .

Since the torsion beam suspension and the trailing arm include an inclined portion that descends toward the opening in the 1G state, for example, when the vehicle is stored, rainwater collected inside the hollow trailing arm is inclined and Rust can be prevented by discharging to the outside through the opening.

The trailing arm has an axle support member on one end side and a vehicle attachment member on the other end side, and has a drain hole at the end of the trailing arm joined to the axle support member. It is preferable to provide a functioning opening. Since the trailing arm is inclined from the other end side provided with the mounting member to the vehicle toward the one end side provided with the axle support member, this makes it difficult for rainwater and dust to collect on the mounting member side with respect to the vehicle body. Can do.

The opening functioning as a drainage hole is preferably provided on the bottom side of the end of the trailing arm joined to the axle support member. Thereby, it is possible to make it easy for rainwater or the like that has entered the trailing arm to flow out.

The trailing arm is preferably provided with a reinforcing flange protruding from the edge of the trailing arm material forming an opening that functions as a drain hole. By providing the reinforcing flange around the opening, it is possible to secure the rigidity of the trailing arm and compensate for the decrease in rigidity due to the opening.

The trailing arm is a member configured by joining a plurality of trailing arm constituent members, and includes a joining line generated when joining the plurality of trailing arm constituent members, and is divided by the joining line. It is preferable that a reinforcing flange is provided on both one trailing arm component and the other trailing arm component. By dividing the trailing arm into a plurality of trailing arm components, even if the trailing arm and its flange have a complicated shape, the complicated shape can be obtained from the metal plate by a simple method such as press molding. Can be easily processed.

To provide a torsion beam suspension including a trailing arm that can naturally discharge rainwater, dust, and the like that have entered a hollow trailing arm configured in a 1G state, and a trailing arm. it can.

It is a perspective view showing the state where the left part of the torsion beam type suspension concerning one embodiment of the present invention was seen from the bottom face side of the back of vehicles. It is the figure which expanded and showed the right side surface of the torsion beam type suspension of FIG. 1 in 1G state. It is a bottom view of the torsion beam type suspension of FIG. It is a top view of the torsion beam type suspension of FIG. It is a rear view of the torsion beam type suspension of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The torsion beam suspension shown in the drawings is merely an example of the embodiment, and the present invention is not limited to the illustrated embodiment.

FIG. 1 shows a torsion beam suspension according to an embodiment of the present invention. The torsion beam suspension 1 includes a pair of left and right trailing arms 11 having a hollow cross section, and a torsion beam 12 whose one end and the other end are fixed to the pair of left and right trailing arms 11. Each trailing arm 11 is hollow from one end to the other end except for an axle support member and a mounting member for a vehicle body, which will be described later, and has an opening 13 communicating with the hollow portion on the bottom surface on one end side. Prepare.

As shown in FIG. 2, the trailing arm 11 is an inclined portion 14 whose bottom surface is lowered toward the opening 13 when viewed from the left side surface or the right side surface in the 1G state. In the present embodiment, when the horizontal position is 0 °, the angle (θ) formed by the bottom surface of the trailing arm 11 in the 1G state is set to −1 °. For example, θ is preferably in the range of −0.5 ° to −10 °. In FIG. 2, the shape of one end of the trailing arm 11 is indicated by a broken line. Further, in FIG. 2, illustration of members on the vehicle body side including a shock absorber, a coil spring, wheels, and the like is omitted, but a trailing arm attached to a stopped vehicle, that is, a trailing arm in the 1G state Is shown.

As shown in FIG. 1 and the like, in this embodiment, the supporting member 16 of the axle 15 is provided on one end side of the trailing arm 11. In the present embodiment, the support member 16 is made of a plate material called an end plate 17, and the axle 15 protrudes from the central portion of the end plate 17 in the left direction or the right direction of the vehicle. The wheel is fixed to the end plate 17 with the wheel-side shaft hole inserted through the axle 15.

As shown in FIG. 2 and the like, an attachment member 18 for the vehicle is provided on the other end side of the trailing arm 11. In the present embodiment, the attachment member 18 for the vehicle is configured by incorporating a bush made of an elastic body such as rubber in a hollow bowl-shaped member 19. The trailing arm 11 and the hollow bowl-shaped member 19 are joined by welding. When the torsion beam suspension is supported on the vehicle body, the shaft on the vehicle side is inserted through the hole of the bush to support the trailing arm 11 so as to be rotatable with respect to the vehicle body. When the addition is input to the trailing arm 11 via the wheels, the vehicle is driven with respect to the vertical direction of the vehicle together with the wheels supported by the trailing arm 11 so as to be rotatable on the other end centering on the vehicle-side shaft passing through the bush. To displace.

In this embodiment, as described above, the axle support member 16 is provided on one end side, the vehicle attachment member 18 is provided on the other end side, and the opening 13 communicating with the hollow portion of the trailing arm 11 is provided on the bottom surface on one end side. Provide. For this reason, rainwater and dust that has entered the inside of the trailing arm 11 have a downward slope from the attachment member 18 side to the vehicle body toward the support member 16 side of the axle in the 1G state, that is, in the state where the vehicle is stored or the like. It is guided to the inclined portion 14 that is inclined, moves to the opening 13, and is discharged to the outside from the opening 13 provided on the bottom surface side of the axle on the support member 16 side. This makes it difficult for rainwater and dust to accumulate particularly on the mounting member side with respect to the vehicle body, and prevents dust and the like from being mixed between the bush and the shaft on the vehicle body side.

In the present embodiment, the trailing arm 11 has a bow-like shape in plan view and bottom view, and includes a protrusion 20 between one end and the other end. As will be described later, the left and right ends of the torsion beam 12 are fixed to the protrusions 20 of the left and right trailing arms 11 so that the protrusions 20 of the left and right trailing arms 11 face inward. The trailing arm 11 includes a steeply inclined portion on the front side of the vehicle in the right side view and the left side view. The steeply inclined portion is configured to have a larger degree of inclination than the inclined portion 14, and the inclination angle is preferably, for example, −5 to −15 °. This makes it difficult for rainwater and dust to accumulate particularly on the mounting member side with respect to the vehicle body, and prevents dust and the like from being mixed between the bush and the shaft on the vehicle body side.

In the present embodiment, a torsion beam 12 having a cross-sectional hat shape including a flat plate member, a front plate member, a rear plate member, and flanges protruding from respective edges of the front plate member and the rear plate member. It fixes to the protrusion 20 of a pair of left and right trailing arms 12 by welding. The bottom surface of the torsion beam 12 is a released surface. On the bottom surface side of the torsion beam suspension 1, a plate-like reinforcing member 21 is fixed to the bottom surface of the protrusion 20 of the trailing arm 12 and the bottom surface of the end portion of the torsion beam 12 to improve the rigidity. Similarly, on the flat surface side of the torsion beam suspension 1, a plate-like reinforcing material 22 is fixed to the flat surface of the protrusion 20 of the trailing arm 12 and the flat surface of the end of the torsion beam 12. The reinforcing material on the bottom side is longer in the extending direction of the torsion beam 12 than the reinforcing material on the flat side.

In the present embodiment, a damper support portion 23 is provided on the inner side of one end side of the trailing arm 12. The damper support portion 23 is composed of a bottom plate, a left plate, and a right plate, and the plane surface is released. A total of two through holes 24 for fixing the end of the damper are provided in the left and right plate members. Further, a support portion 25 for the coil spring is provided between the support portion 23 for the damper and the protrusion 20. The support portion 25 of the coil spring is composed of a plate material on the bottom surface side and a plate material that protrudes from the flat surface side, and protrudes from the inside of the trailing arm in the extending direction of the torsion beam.

In the present embodiment, the trailing arm 11 includes a plurality of trailing arm constituent members 26. More specifically, as shown in FIG. 1, two trailing arm constituent members 26 are welded to form one trailing arm 11. Each trailing arm component member 26 is manufactured by bending a metal plate such as a steel plate into a curved shape having the protrusions 20.

In the present embodiment, as shown in FIG. 1, the metal plate constituting the trailing arm 11 is fixed by welding both in contact with the edge on the back side of the end plate. The metal plate on the bottom side of the trailing arm 11 is cut into a substantially semicircular shape, and forms an opening 13 for drainage. The metal plate forming the opening 13 is bent toward the bottom surface side and constitutes a reinforcing flange 27 for reinforcement. By providing the reinforcing flange 27, the lack of rigidity is compensated by providing the opening 13 at the joint between the end plate 17 and the trailing arm 11.

In the present embodiment, as described above, the two trailing arm constituent members are joined by welding along the extending direction of the trailing arm 11. For this reason, the joining line 28 appears along the extending direction of the trailing arm 11. A reinforcing flange 27 is provided on both the one trailing arm component member 26 and the other trailing arm component member 26 divided by the joining line 28. Since the trailing arm 11 is divided into a plurality of parts, even if the shapes of the reinforcing flange 27 and the trailing arm 11 are complicated, for example, the trailing arm 11 has a shape corresponding to the shape of a desired trailing arm constituent member. The trailing arm 11 including the reinforcing flange 27 and the protrusion 20 can be quickly and easily formed by press molding in which a metal plate before molding is sandwiched between molds and pressed. For example, when bending by pressing a punch into a metal pipe, trying to process it into a complicated shape locally makes the pipe thin or thick, making it vulnerable to stress loading. However, since the trailing arm is divided in the trailing arm of this embodiment, it is possible to prevent such a problem from occurring.

DESCRIPTION OF SYMBOLS 1 Torsion beam type suspension 11 Trailing arm 12 Torsion beam 13 Opening 16 Axle support member 27 Reinforcement flange 28 Joining line 26 Trailing arm component 14 Inclined part

Claims (6)

A pair of left and right trailing arms with a hollow cross section,
A torsion beam suspension comprising a torsion beam having one end and the other end fixed to a trailing arm;
The trailing arm is provided with an opening communicating with the hollow portion at one end thereof, and a vehicle mounting member is provided at the other end. The bottom surface of the trailing arm is in the 1G state from the other end toward the opening. A torsion beam suspension that includes a slope part that descends, the slope part functions as a path that guides water that has entered the interior to the opening, and the opening functions as a drainage hole that drains the water in the trailing. The torsion beam according to claim 1, wherein the trailing arm includes an axle support member at one end thereof, and an opening functioning as a drain hole is provided at an end of the trailing arm joined to the axle support member. Suspension. The torsion beam suspension according to claim 2, wherein the opening functioning as a drainage hole is provided on a bottom surface side of an end portion of a trailing arm joined to a support member of an axle. The torsion beam suspension according to any one of claims 1 to 3, wherein the trailing arm includes a reinforcing flange protruding from an edge of the trailing arm member that forms an opening that functions as a drain hole. The trailing arm is a member configured by joining a plurality of trailing arm constituent members, and includes a joining line generated when joining the plurality of trailing arm constituent members, and is divided by the joining line. The torsion beam type suspension according to any one of claims 1 to 4, wherein a reinforcing flange is provided on both one trailing arm component and the other trailing arm component. The cross-section is hollow, and an opening communicating with the hollow portion is provided on one end side thereof, and the shape of the bottom surface of the trailing arm is provided with an inclined portion that descends from the other end side toward the opening on the one end side in the 1G state. The sloping part functions as a path that guides the water that has entered the interior to the opening, and the opening functions as a drainage hole for discharging the water in the trailing arm.

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