JP2015157596A - Torsion beam type suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsion beam type suspension capable of increasing support rigidity of a link member while securing proper productivity, high strength and the like by a simple configuration.SOLUTION: A bracket 50, which is fixed to a trailing arm 20, which is fixed to a spring seat 30 for supporting a lower end of a suspension spring, on the spring seat 30, and which supports one end of a link member on a width-direction inside of a vehicle body, has an upper front wall part 52 being a wall part on the front side of the vehicle body and an upper rear wall part 54 on the rear side of the vehicle body, which are a pair of wall parts for supporting the one end of the link member together. At least one of the upper front wall part 52 and the upper rear wall part 54 is extended toward the trailing arm 20 and fixed by being connected thereto.

Description

  The present invention relates to a vehicle suspension device, and more particularly to a torsion beam suspension including a bracket for holding a link member.

  In recent years, for suspension devices for vehicles such as automobiles, a torsion beam type suspension having a small number of parts, a relatively simple structure and excellent space efficiency has been adopted not only for small displacement vehicles but also for medium displacement vehicles. There are more and more cases.

  Therefore, such a torsion beam type suspension is required to increase its strength and rigidity while improving its productivity.

  Under such circumstances, Patent Document 1 relates to a coupled torsion beam axle in which a carrier to which a rear wheel is mounted is connected to each of both ends of a torsion beam via a trailing arm and a carrier bracket. And a steering rod having one end linked to the carrier and the other end linked to the mounting bracket, and the rear wheel toe-in during steering improves compliance characteristics. An arrangement intended to do so is disclosed.

JP 2013-56656 A

  However, according to the study of the present inventor, in the coupled torsion beam axle configuration of Patent Document 1, since one end of the steering rod is linked to the carrier, depending on the layout of peripheral components such as a suspension spring and a damper. In some cases, it is difficult to dispose one end of the steering rod on the carrier, and if the steering rod is disposed on the carrier while preventing the interference of the peripheral parts, the shape of the steering rod becomes complicated and the steering rod is complicated. It is thought that the manufacturing cost of the directional rod, and thus the torsion beam axle, tends to increase.

  Further, according to a further study by the present inventor, the auxiliary link member such as the steering rod can be reduced in manufacturing cost if it has a shape extending in a straight line. Even if a link member is used, it is considered to be important to realize a torsion beam suspension having a novel configuration capable of improving its supporting strength and supporting rigidity while reliably preventing interference with peripheral components.

  The present invention has been made through the above-described studies, and provides a torsion beam suspension capable of improving the supporting rigidity of the link member while ensuring good productivity and high strength with a simple configuration. Objective.

In order to achieve the above object, the torsion beam suspension according to the first aspect of the present invention has one end supported by the vehicle body and a trailing arm that supports the wheel on the other end and the trailing arm is connected. And a torsion beam extending in the width direction of the vehicle body, a spring seat fixed to the trailing arm, and supporting a lower end portion of a suspension spring, and fixed to the spring seat and a link. A bracket that supports one end portion of the member on the inner side in the width direction, and the bracket is a pair of wall portions that support the one end portion of the link member together, and is provided on the front side of the vehicle body. An upper front wall portion that is a wall portion and an upper rear wall portion on the rear side of the vehicle body, and at least the upper front wall portion and the upper rear wall portion Write has a structure in which the towards the trailing arm is connected to extend in the trailing arm is fixed.

  According to the present invention, in addition to the first aspect, the spring seat includes a bottom wall portion that supports the lower end portion of the suspension spring, and a front wall-side front end of the bottom wall portion from above the vehicle body. A curved wall portion that extends to the front side and curves in a convex shape toward the front side, the lower front wall portion located on the front side of the suspension spring, and the rear end of the bottom wall portion on the rear side A curved wall portion that extends upward and curves in a convex shape toward the rear side, and has a lower rear wall portion that is located on the rear side of the suspension spring, and the lower front wall portion and the Secondly, one of the lower rear walls extends to the trailing arm along the corresponding one of the upper front wall and the upper rear wall and is fixedly connected to the trailing arm. The aspect of .

  Further, according to the present invention, in addition to the first or second aspect, the portion of the bracket that supports the one end portion of the link member and the portion that is connected to the trailing arm are both widths in the longitudinal direction of the vehicle body. Is a wide shape part.

  Further, according to the present invention, in addition to the second or third aspect, one of the lower front wall portion and the lower rear wall portion has a pair of side wall portions, and the pair of side wall portions includes suspension dampers. The fourth aspect is to accommodate and support the lower end.

  In addition to the fourth aspect, the present invention further includes a reinforcing member that connects the trailing arm and the one located on the inner side of the pair of side wall portions. Let it be a situation.

  According to the configuration in the first aspect of the present invention, the link member is fixed to the trailing arm and fixed to the lower end of the suspension spring, and the one end of the link member is widened. The brackets supported on the inner side in the direction are a pair of wall portions that support both end portions of the link member, and are an upper front wall portion that is a front wall portion of the vehicle body and an upper rear wall that is the rear side of the vehicle body And at least one of the upper front wall portion and the upper rear wall portion extends toward the trailing arm and is fixedly connected to the trailing arm. Thus, the supporting rigidity of the link member can be improved while ensuring good productivity and high strength.

  Further, according to the configuration in the second aspect of the present invention, the spring seat extends from the front end of the bottom wall portion supporting the lower end portion of the suspension spring and the front end of the bottom wall portion to the upper side of the vehicle body. And a curved wall portion that curves in a convex shape toward the front side, and extends downward from the rear end of the rear side of the bottom wall portion and the rear side of the bottom wall portion, and to the rear side. A curved wall portion that curves in a convex shape, and has a lower rear wall portion located on the rear side of the suspension spring, and one of the lower front wall portion and the lower rear wall portion is the upper front wall portion and the upper rear wall Because it extends to the trailing arm along the corresponding side of the wall and is fixedly connected to the trailing arm, it can easily interfere with the peripheral parts of the link member with a simple structure. Link while suppressing It is possible to improve the support rigidity of wood.

Further, according to the configuration of the third aspect of the present invention, both the portion of the bracket that supports the one end portion of the link member and the portion that is connected to the trailing arm are shape portions that are wide in the longitudinal direction of the vehicle body. The support rigidity of the link member can be further increased.

  According to the configuration of the fourth aspect of the present invention, one of the lower front wall portion and the lower rear wall portion has a pair of side wall portions, and the pair of side wall portions accommodates the lower end portion of the suspension damper. Therefore, the suspension damper can be reliably supported with a simple and compact configuration.

  Moreover, according to the structure in the 5th aspect of this invention, by providing the reinforcement member which connects what is located in an inner side among a pair of side wall parts, and a trailing arm, it is a simple structure. The mounting rigidity of the link member and the suspension damper can be further improved.

It is a fragmentary perspective view which shows the principal part of the torsion beam type suspension in embodiment of this invention. It is a partial enlarged plan view of the torsion beam type suspension in the present embodiment. It is a partial expansion perspective view which shows parts other than the bracket of the torsion beam type suspension in this embodiment.

  Hereinafter, the torsion beam suspension according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3 as appropriate. In the figure, the x-axis, y-axis, and z-axis form a three-axis orthogonal coordinate system. The positive direction of the x axis is the front direction of the vehicle body, the positive direction of the y axis is the left direction of the vehicle body, and the positive direction of the z axis is the upward direction of the vehicle body. In addition, the x-axis direction may be referred to as the longitudinal direction, and the y-axis direction may be referred to as the width direction.

  FIG. 1 is a partial perspective view showing a main part of a torsion beam suspension in the present embodiment. FIG. 2 is a partially enlarged plan view of the torsion beam suspension in the present embodiment. FIG. 3 is a partially enlarged perspective view showing a portion other than the bracket of the torsion beam suspension in the present embodiment. 1 to 3 mainly show the configuration on the left side of the torsion beam suspension, but the configuration on the right side, not shown, has a configuration that is symmetrical with respect to the configuration on the left side.

  First, the overall configuration of the torsion beam suspension 1 according to the present embodiment will be described in detail with reference to FIGS. 1 to 3.

  The torsion beam suspension 1 includes a torsion beam 10, a trailing arm 20, a spring seat 30, and a bracket 50, all of which are mounted on a vehicle body such as a rear side frame of an automobile or the like (not shown) while being suspended by a suspension spring (hereinafter referred to as a spring). ), Suspension dampers (hereinafter referred to as dampers), suspension link members (hereinafter referred to as link members), wheels, and the like. Such a torsion beam suspension 1 typically has a shape that is bilaterally symmetric with respect to a plane that is parallel to the xz plane and that passes through the center in the width direction. The arm 20, a pair of left and right spring seats 30, and a pair of left and right brackets 50 are provided.

Specifically, the torsion beam 10 is a plate member made of a metal plate such as a steel plate typically having an upwardly convex shape, and extends in the width direction and has a pair of left and right trailing members at both ends thereof. The arm 20 is connected. The torsion beam 10 may have a convex shape on either the front side or the rear side of the vehicle body, or may be formed of a metal pipe member such as a steel pipe.

  The trailing arm 20 is typically a substantially cylindrical member made of a metal pipe member such as a steel pipe, and is fixed by being welded to the torsion beam 10 by arc welding or the like. In the trailing arm 20, a collar member 70, typically a rounded metal plate such as a steel plate, supported by the vehicle body at the front end thereof is fixed by welding by arc welding or the like, while the rear thereof A wheel support member 80 made of metal such as steel, which supports the wheel, is fixed to the end by welding by arc welding or the like. The trailing arm 20 may be configured by a member obtained by forming a plate member made of a metal plate such as a steel plate into a substantially U-shaped longitudinal section. Further, the wheel support member 80 may be welded and fixed by arc welding or the like in a state in which a part thereof is inserted or fitted to the rear end of the trailing arm 20.

  The spring seat 30 is fixed by welding to the trailing arm 20 by arc welding or the like, and can freely support the lower end portion of the spring and the lower end portion of the damper. The spring seat 30 is perforated so as to penetrate the bottom wall portion 31 parallel to the xy plane, the convex portion 32 having a convex shape upward from the bottom wall portion 31, and the convex portion 32 in the vertical direction. It has the formed through-hole 33. Further, the bottom wall portion 31 is formed by drilling in the vertical direction, and has a plurality of mounting holes 34 provided on the same circumference with the convex portion 32 as the center.

  Further, the spring seat 30 is integrally formed so as to extend upward from the front end of the bottom wall portion 31 and has a curved lower front wall portion 35 that is convex forward in plan view, and a bottom thereof. It has a curved lower rear wall portion 36 that is integrally formed so as to extend upward from the rear end of the wall portion 31 and is convex rearward in a plan view.

  Further, in the spring seat 30, the lower front wall portion 35 has a front flange 37 integrally formed so as to extend forward from the upper end thereof, and the lower rear wall portion 36 extends rearward from the upper end thereof. It has a rear flange 38 that is integrally formed to exist. Note that when the strength of the spring seat 30 is sufficient, such as a thick plate, at least one of the flanges 37 and 38 can be omitted.

  Here, the peripheral edge portion at the left end of the lower front wall portion 35 is cut out so as to be recessed toward the right side so as to conform to the shape of the corresponding outer peripheral surface of the trailing arm 20. The notched portion is in a form in which it is in contact with the outer peripheral surface of the trailing arm 20 and is typically welded by arc welding or the like, so that the lower front wall portion 35 is moved to the trailing arm 20. Fixed.

  Further, in the spring seat 30, a part of the lower rear wall portion 36 is cut out, and a pair of side wall portions 39 and 40 integrally formed so as to extend rearward while facing each other in the width direction. Is provided. The side wall portions 39 and 40 can accommodate and support the lower end portion of the damper therebetween, and have correspondingly formed through holes 41 and 42 which are formed by drilling in the width direction and opposed to each other. A nut member 90 is fixed to the through hole 42. In addition, although a pair of left and right side wall portions 39 and 40 are provided on the lower rear wall portion 36, the side wall portions 39 and 40 are provided on the lower front wall portion 35 depending on circumstances such as the position of the damper. Also good. Further, the nut member 90 may be provided in the through hole 41.

Here, the peripheral edge portion at the left end of the lower rear wall portion 36 is notched so as to be recessed toward the right side so as to conform to the shape of the corresponding outer peripheral surface of the trailing arm 20. The notched portion is in a form in which it is in contact with the outer peripheral surface of the trailing arm 20 and is typically welded by arc welding or the like, so that the lower rear wall portion 36 is moved to the trailing arm 20.
Fixed.

  The bracket 50 is fixed by being welded to the spring seat 30 by arc welding or the like, and supports one end of the link member. The bracket 50 is an upper wall portion 51 that is parallel to the xy plane, and a vertical wall portion that is disposed so as to hang from the front end of the upper wall portion 51, and penetrates the vertical wall portion in the front-rear direction. An upper front wall portion 52 having a through hole 53 formed by drilling in this manner, and a vertical wall portion disposed so as to hang from the rear end of the upper wall portion 51, and the vertical wall portion The upper back wall part 54 which has the through-hole 55 drilled so that it may penetrate in a direction is provided. The upper front wall portion 52 is located above the lower front wall portion 35 of the spring seat 30 and has a curved shape that protrudes forward in plan view similarly to the upper front wall portion 52. The upper rear wall portion 54 is located above the lower rear wall portion 36 of the spring seat 30 and has a curved shape that protrudes rearward in plan view similarly to the upper rear wall portion 54. A nut member 90 is fixed to the through hole 53. Note that the upper wall portion 51 can be omitted when the strength of the bracket 50 is sufficiently secured, such as a thick plate. Further, the nut member 90 may be provided in the through hole 55.

  The bracket 50 further includes a front flange 56 formed so as to extend forward from the lower end of the upper front wall portion 52 and a rear portion formed so as to extend rearward from the lower end of the upper rear wall portion 54. A flange 57 is provided. The front flange 56 is typically fixed to the front flange 37 provided on the lower front wall portion 35 of the spring seat 30 by welding by arc welding or the like. The rear flange 57 is typically fixed to the rear flange 38 provided on the lower rear wall portion 36 of the spring seat 30 by welding by arc welding or the like. In addition, when the intensity | strength is fully ensured, such as the board thickness of the bracket 50 is thick, at least 1 of the flanges 56 and 57 is omissible. When at least one of the flanges 37, 38, 56 and 57 is omitted, the lower front wall portion 35, the lower rear wall portion 36, the upper front wall portion 52 and the upper portion where the flanges 37, 38, 56 and 57 are omitted. The rear wall portion 54 is welded and fixed to the mating member that should have been fixed by welding the omitted flanges 37, 38, 56 and 57.

  Further, in the bracket 50, the upper wall portion 51 and the upper front wall portion 52 extend across the inner end of the spring seat 30 and the right outer peripheral surface of the trailing arm 20 in plan view. The rear end of the wall portion 51 is cut out in a convex arcuate shape so that the width of the left and right end portions is widened. If necessary, the upper wall portion 51 and the upper front wall portion 52 may extend over the inner end of the spring seat 30 and the upper peripheral surface of the trailing arm 20.

  Thus, by notching the rear end of the upper wall portion 51 in an arc shape, interference with the spring whose lower end portion is supported by the spring seat 30 can be prevented, and furthermore, both ends of the bracket 50 in the width direction. The support rigidity of the link member can be improved by widening the width in the front-rear direction at the portion.

  Further, depending on the location of the damper or the like, the upper wall portion 51 and the upper rear wall portion 54 may extend across the inner end of the spring seat 30 and the right outer peripheral surface portion of the trailing arm 20. In this case, the front end of the upper wall portion 51 may be cut out in an arc shape. In such a case, the upper wall portion 51 and the upper rear wall portion 54 may extend over the inner end of the spring seat 30 and the upper peripheral surface of the trailing arm 20 as necessary. Further, if the mounting strength and mounting rigidity of the bracket 50 to the trailing arm 20 are to be increased, the upper wall portion 51, the upper front wall portion 52, and the upper rear wall portion 54 are connected to the spring seat 30 and the trailing arm 20. You may extend over.

Further, the reinforcing member 60, which is typically a metal plate such as a steel plate, typically connects the side wall portion 39 located on the inner side in the width direction and the trailing arm 20 while obliquely moving in the vertical direction. It is fixed by being welded to these by arc welding or the like. The reinforcing member 60 includes a vertical wall portion 61 that connects the side wall portion 39 and the trailing arm 20, and a flange 62 that is integrally formed so as to extend rearward from the upper end of the vertical wall portion 61.

  Further, in the reinforcing member 60, the left side portion of the vertical wall portion 61 is cut out in a shape recessed toward the right side so as to follow the shape of the outer peripheral surface of the trailing arm 20. The notched portion is a mode in which the left side portion is in contact with the outer peripheral surface of the trailing arm 20, and the reinforcing member 60 is typically welded to the trailing arm 20 by arc welding or the like. It is fixed.

  Further, the reinforcing member 60 further extends to the right from the front end of the auxiliary wall 63 and the auxiliary wall 63 integrally formed so as to extend forward from the lower end of the vertical wall 61. Thus, the flange 64 is integrally formed. The upper end portion of the auxiliary wall portion 63 abuts on the outer peripheral surface of the trailing arm 20, and is typically fixed by being welded to the trailing arm 20 by arc welding or the like.

  In the torsion beam suspension 1 having the above configuration, the vehicle body mounting portion B1 is set as a portion to be mounted on the vehicle body, and a wheel mounting portion for mounting a wheel side member as a mounting portion for mounting various external force application components. W1, a spring attachment portion S1 for attaching a suspension spring, and a link member attachment portion L1 for attaching a link member are set.

  Specifically, the vehicle body attachment portion B <b> 1 is disposed corresponding to the collar member 70 provided at the front end of the trailing arm 20. The vehicle body mounting portion B1 is attached to the vehicle body by being typically fastened by a fastening member such as a bolt (not shown) via a bush member (not shown) that is press-fitted into the collar member 70. .

  The spring mounting portion S <b> 1 is disposed corresponding to the bottom wall portion 31 of the spring seat 30. In the spring mounting portion S1, the spring is mounted by being placed on the upper portion of the bottom wall portion 31 of the spring seat 30. In order to reduce the rubbing noise of the spring, a disc-shaped elastic member may be placed in the mounting hole 34 provided in the bottom wall portion 31, and the spring may be placed thereon.

  The wheel mounting portion W <b> 1 is disposed corresponding to a wheel support member 80 provided at the rear end of the trailing arm 20. In such a wheel mounting portion W1, a bearing member is typically mounted by being fastened to the wheel support member 80 by a fastening member such as a bolt, and the wheel is mounted via these.

  The link member attachment portion L1 is disposed corresponding to the bracket 50. In the link member mounting portion L1, one end of the link member is omitted through the through hole 53 and the nut member 90 provided in the upper front wall portion 52 and the through hole 55 provided in the upper rear wall portion 54. Fastened with a fastening member such as a fastening bolt. In addition, as a link member, auxiliary link members, such as a Watts link, a lateral rod, and a Panard rod, are mentioned, However, As long as the fastening shaft is distribute | arranged to the bracket 50, other things may be sufficient.

  The various nut members described above are typically made of metal such as steel.

In the present invention, the type, shape, arrangement, number, and the like of the members are not limited to the above-described embodiment, and the gist of the invention is appropriately replaced such that the constituent elements are appropriately replaced with those having the same operational effects. Of course, it can be changed as appropriate without departing from the scope.

  As described above, the present invention can provide a torsion beam suspension capable of improving the support rigidity of the link member while ensuring good productivity, high strength, and the like with a simple configuration. Therefore, it is expected that it can be widely applied to the field of moving torsion beam suspensions of vehicles and the like because of its general purpose universal character.

DESCRIPTION OF SYMBOLS 1 ... Torsion beam type suspension 10 ... Torsion beam 20 ... Trailing arm 30 ... Spring seat 31 ... Bottom wall part 32 ... Convex part 33 ... Through-hole 34 ... Mounting hole 35 ... Lower front wall part 36 ... Lower rear wall part 37, 56 ... Front flange 38, 57 ... Rear flange 39, 40 ... Side wall 41, 42, 53, 55 ... Through hole 50 ... Bracket 51 ... Upper wall 52 ... Upper front wall 54 ... Upper rear wall 60 ... Reinforcement member 61 ... Vertical wall 62, 64 ... Flange 63 ... Auxiliary wall 70 ... Collar member 80 ... Wheel support member 90 ... Nut member

Claims (5)

A trailing arm that is supported by the vehicle body at one end and a wheel at the other end;
Connecting the trailing arm, and a torsion beam extending in the width direction of the vehicle body;
A spring seat fixed to the trailing arm and supporting the lower end of the suspension spring;
A bracket fixed to the spring seat and supporting one end of the link member on the inner side in the width direction;
With
The bracket is a pair of wall portions that support the one end portion of the link member together, an upper front wall portion that is a wall portion on the front side of the vehicle body and an upper rear wall portion on the rear side of the vehicle body, Have
A torsion beam suspension in which at least one of the upper front wall portion and the upper rear wall portion extends toward the trailing arm and is connected and fixed to the trailing arm. The spring seat is
A bottom wall that supports the lower end of the suspension spring;
A lower front wall that extends from the front end of the front side of the bottom wall to the upper side of the vehicle body and curves in a convex shape toward the front side, and is positioned on the front side of the suspension spring And
A lower wall portion that extends from the rear end of the rear side of the bottom wall portion to the upper side and curves in a convex shape toward the rear side, and is located on the rear side of the suspension spring. When,
Have
One of the lower front wall and the lower rear wall extends along a corresponding one of the upper front wall and the upper rear wall to the trailing arm and is connected to the trailing arm and fixed. The torsion beam type suspension according to claim 1 provided.   3. The torsion beam suspension according to claim 1, wherein a portion of the bracket that supports the one end portion of the link member and a portion that is connected to the trailing arm are shape portions having a wide width in the front-rear direction of the vehicle body. .   4. One of the lower front wall portion and the lower rear wall portion has a pair of side wall portions, and the pair of side wall portions accommodates and supports a lower end portion of a suspension damper. Torsion beam suspension.   The torsion beam suspension according to claim 4, further comprising a reinforcing member that connects the trailing arm to the inner side of the pair of side wall portions.

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