JP2006037999A - Strut upper mount structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the maximum stroke amount of a shock absorber without changing the height of a strut upper mount. <P>SOLUTION: An elastic body 6 is mounted between an inner cylinder fitting mounted at the upper part of a strut and an outer cylinder fitting 5 arranged on the outer periphery of the inner cylinder fitting 4. The outer cylinder fitting 5 has a recessed portion 5c swollen upward from a vehicle body mounting portion 5b. A strut bearing 8 is arranged on the side of the lower face of the recessed portion 5c via the elastic body 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a strut upper mount structure for mounting an upper portion of a strut in a strut type suspension on a vehicle body side.

In a strut upper mount structure in a conventional strut suspension, for example, as described in Patent Document 1, an inner cylinder fitting is coaxially fixed to a small-diameter portion at an upper part of a strut, and is fixed to a vehicle body side on an outer peripheral side of the inner cylinder fitting. An outer cylinder fitting to be used is arranged. An elastic body is interposed between the inner cylinder fitting and the outer cylinder fitting, and the elastic body is vulcanized and bonded to the inner peripheral surfaces of the inner cylinder fitting and the outer cylinder fitting. Further, a strut bearing is attached to the lower end portion of the inner cylinder fitting or the strut itself, and a spring upper sheet is supported on the inner cylinder fitting or the strut itself via the strut bearing. And the upper end part of the suspension spring arrange | positioned substantially coaxially with the strut is seated on the spring upper seat.
Japanese Patent Laid-Open No. 06-122308

In the above-mentioned prior art 1, the strut bearing support position is changed from the strut itself to the inner tube fitting to increase the maximum stroke amount of the shock absorber by the amount of the bearing. I want to plan.
The present invention has been made paying attention to such points, and it is an object of the present invention to be able to increase the maximum stroke amount of the shock absorber without changing the height of the strut upper mount.

In order to solve the above-described problems, the present invention provides an elastic body interposed between an inner cylinder fitting attached to an upper portion of a strut and an outer cylinder fitting arranged on the outer periphery of the inner cylinder fitting, and the outer cylinder fitting In the strut upper mount structure that is attached to the vehicle body side,
An upper end portion of a suspension spring is supported on the outer cylinder fitting through an elastic body.

  According to the present invention, the height at which the upper end portion of the suspension spring is attached can be increased without changing the height at which the strut is attached to the vehicle body.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view for explaining a strut upper mount structure according to the present embodiment.
First, the configuration will be described. The inner cylinder fitting 4 is attached to the upper end portion of a shock absorber rod (hereinafter simply referred to as the rod 1), the outer cylinder fitting 5 is disposed on the outer peripheral side thereof, and the outer cylinder fitting 5 An elastic body 6 made of a rubber material is interposed between the inner cylinder fitting 4.

The inner cylinder fitting 4 is composed of an upper inner cylinder fitting 2 and a lower inner cylinder fitting 3, and a lower end portion of the upper inner cylinder fitting 2 and an upper end portion of the lower inner cylinder fitting 3 have an inward flange shape. Thus, attachment portions 2a and 3a to the rod 1 are formed. The upper end portion of the upper inner tubular fitting 2 projects outward to form an upper projecting portion 2b, and the lower end portion of the lower inner tubular fitting 3 also projects outward to form a lower projecting portion 3b. Yes.
Further, the outer cylindrical metal fitting 5 constitutes a rising portion 5a whose inner peripheral side portion rises in a substantially vertical direction, and the vehicle body mounting portion 5b on the outer peripheral portion is relatively lower than the upper end of the rising portion 5a. By being set, a concave portion 5c bulging upward is formed between the inner peripheral side and the outer peripheral portion.

  Here, the rising portion 5a has a curved shape such that the contour in the vertical direction swells to the inner peripheral side along the inner peripheral surface of the inner cylindrical member 4, and the upper part thereof is the inner cylindrical member. 4 is formed to face the upper overhanging portion 2b in the horizontal direction and the vertical direction. Since the shape of the rising portion 5a is such that the outline extends, the upper projecting portion 2b can easily come into contact with the opposing surface in a substantially orthogonal direction. Moreover, the lower end part of the rising part 5a is the position which opposes the said lower side overhang | projection part 3b in an up-down direction. The elastic body 6 interposed between the inner cylinder fitting 4 and the outer cylinder fitting 5 is vulcanized and bonded to the upper inner cylinder fitting 2 on the inner circumference side and on the outer circumference of the rising portion 5a. It is vulcanized. The elastic body 6 is also attached so as to cover the upper surface of the upper inner cylindrical metal fitting 2 and the overhanging portion 2a. Further, the elastic body 6 is also attached to a portion of the rising portion 5a that is vertically opposed to the lower projecting portion 3b.

In the present embodiment, the inner peripheral side of the elastic body 6 is the lower side for the purpose of reducing the lateral rigidity between the inner cylindrical metal fitting 4 and the outer cylindrical metal fitting 5 while reducing the horizontal rigidity. Although not vulcanized and bonded to the inner cylinder fitting 3, the lower inner cylinder fitting 3 may also be vulcanized and bonded.
The elastic body 7 is also vulcanized and bonded in the recess 5c, and a strut bearing 8 is disposed in the recess 5c via the elastic body 7.

Then, a spring upper seat (not shown) is attached to the strut bearing 8, and the upper end portion of the suspension spring is seated on the seat portion formed on the spring upper seat, so that the upper end portion of the spring is the outer cylinder fitting 5 Supported by The spring seat does not necessarily have to protrude in the outer circumferential direction as in the prior art, and may have a structure in which the seating portion 9 is located at the lower end portion position of the bearing 8 (in FIG. reference).
Further, the vehicle body attachment portion 5b of the outer cylinder fitting 5 located at a position lower than the recess 5c is attached to the vehicle body side member 10 by bolt fastening, and the outer cylinder fitting 5 is connected to the vehicle body side.
Here, the code | symbol 11 has shown bumper bound.

Next, functions and effects of the above configuration will be described.
When the strut bearing is disposed in series with the bumper bound 11 and the shock absorber rod 1 as in the prior art, the strut upper mount needs to be set higher as the strut bearing position is higher. There is. In addition, when the strut bearing is attached to the inner cylindrical fitting 4, the maximum stroke of the shock absorber can be set to be larger than the bearing, but the bearing is attached to the upper part of the rod 1 via the rigid inner cylindrical fitting 4. Therefore, if the survival space of the suspension spring (the space occupied by the spring, mainly the size of the vertical space) is to be increased, the strut upper mount may also have to be set high.

  On the other hand, in this embodiment, the strut bearing 8 is disposed on the side of the outer cylinder fitting 5 that is not rigidly connected to the rod 1, so that the living space of the spring can be obtained without changing the height of the rod 1. The margin at the top and bottom of is increased. As a result, even if the living space of the spring is set to the same level as before, the maximum stroke of the suspension is increased by the margin, or the bonnet height is set lower by lowering the height attached to the vehicle body. It becomes possible to do.

  Here, even if the strut mounting surface is lowered, if the bonnet height is the same as before, the gap between the strut mounting surface and the bonnet can be made large, resulting in a contact between the pedestrian and the vehicle. It is possible to increase the cushioning vertical space to be absorbed. In addition, an increase in the space for the spring also increases the degree of freedom in arranging the spring. For example, by arranging the spring at an inclination, it becomes easier to design the optimization of the spring expansion and contraction.

In particular, in the present embodiment, the outer cylinder fitting 5 is formed with a recess 5c that swells above the vehicle body mounting portion 5c and the strut bearing 8 is disposed in the recess 5c. Can be set large.
The reason why the strut bearing 8 is disposed on the outer cylinder 5 through the elastic body 7 is to prevent the input from the spring from being directly transmitted to the vehicle body side.

  Further, in the present embodiment, since the rising portion 5a of the outer cylinder fitting 5 is disposed opposite to the overhanging portion 2b provided on the upper portion of the inner cylinder fitting 4 in the lateral direction, the outer cylinder fitting 5 attached to the vehicle body side. In the rising portion 5a, the swinging of the overhanging portion 2b of the inner cylinder bracket 4 in the left-right direction can be regulated, that is, the swinging of the rod 1 in the left-right direction can be described. At this time, by reducing the lateral gap between the protruding portion 2b and the rising portion 5a, the horizontal swing of the rod 1 is restricted without increasing the hardness of the elastic body 6. That is, the camber rigidity is improved by restricting the left-right swing of the rod 1 to be small, and the vibration absorption performance is improved because the hardness of the elastic body 6 interposed between the inner cylinder fitting 4 and the outer cylinder fitting 5 is not increased. Sacrificing can be avoided, that is, the camber rigidity, which is an important characteristic in handling stability, can be improved while ensuring the required vibration absorbing performance.

At this time, since the elastic body 6 made of a rubber material is disposed at the tip of the overhang portion 2b, it is possible to suppress the generation of abnormal noise when the overhang portion 2b collides with the rising portion 5a. The elastic body 6 made of a rubber material may be provided on the rising portion 5a side. The reason why the elastic body 6 does not exist between the rising part 5a and the overhanging part 2b (the part where the notch is formed) is to keep the rigidity of the elastic body 6 low.
Here, in the above-described embodiment, the concave portion 5c bulging upward from the vehicle body mounting portion is formed in the outer tubular metal fitting 5, but the elastic body 6 is formed without forming the concave portion 5c bulging upward from the vehicle body mounting portion. A strut bearing 8 may be disposed therethrough. Even in this case, the living space of the spring can be made larger than before.

It is a side surface which shows the strut upper mount structure which concerns on embodiment based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shock absorber rod 2b Overhang | projection part 4 Inner cylinder metal fitting 5 Outer cylinder metal fitting 5a Rising part 5b Car body attachment part 5c Recess 6 Elastic body 7 Elastic body 8 Strut bearing 10 Car body side member

Claims (4)

In a strut upper mount structure in which an elastic body is interposed between an inner cylinder fitting attached to the upper portion of the strut and an outer cylinder fitting arranged on the outer periphery of the inner cylinder fitting, and the outer cylinder fitting is attached to the vehicle body side,
A strut upper mount structure, wherein an upper end portion of a suspension spring is supported by an elastic body with respect to the outer cylinder fitting.   The outer cylinder fitting has an inner circumference side portion connected to the outer circumference surface of the inner cylinder fitting via an elastic body, and a vehicle body attachment portion on the outer circumference side, and a portion between the inner circumference side portion and the vehicle body attachment portion. A recess swelled above the vehicle body mounting portion is formed, and a strut bearing is disposed on the lower surface side of the recess via an elastic body, and the upper end portion of the suspension spring is seated through the strut bearing. 2. The strut upper mount structure according to claim 1, wherein a spring upper seat is supported.   The present invention is characterized in that an overhanging portion that protrudes to the outer peripheral side is provided on the upper portion of the inner cylinder fitting, and a surface that restricts the fall of the inner cylinder is provided on the outer cylinder fitting in a lateral direction. The strut upper mount structure according to claim 1 or 2.   The strut upper mount structure according to claim 3, wherein rubber is attached to at least one of the projecting portion facing in the lateral direction or the surface on the outer cylinder fitting side.

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