JP6800534B2 - Dust cover assembly structure - Google Patents

Description

The present invention relates to an assembly structure of a dust cover used for a suspension or the like of a transportation device such as an automobile.

FIG. 3 is a side view schematically showing the configuration of a strut type suspension of an automobile. Note that FIG. 3 is shown as a cross-sectional view of the suspension in the axial direction.

As shown in FIG. 3, the strut type suspension 100 includes an upper support 140 and a rebound stopper 160 that are fastened and fixed to the piston rod 130 of the shock absorber of the suspension that penetrates the vehicle body 150 of the automobile.

The upper support 140 is arranged in the recess formed in the vehicle body 150 via the shock absorber 180a, and the rebound stopper 160 is partially located in the recess through the through hole opened in the recess of the vehicle body 150 and the shock absorber 180b. It is fixed to the tip 170 of the piston rod 130 via. The upper support 140, the rebound stopper 160, and the cushioning bodies 180a and 180b have a planar annular outer shape that is symmetrical around the axis of the piston rod 130.

Further, below the upper support 140, a cylindrical dust cover 110 for covering the piston rod 130 and protecting the piston rod 130, and a cup-shaped frame 120 that is assembled to the dust cover 110 and fixed to the upper support 140. Is provided.

The dust cover 110 is a member made of synthetic resin formed by blow molding, and is assembled by fitting it on the outside of a metal frame 120. Further, by providing an engaging hole 120x on the peripheral wall of the frame body 120 and providing a protrusion 110a corresponding to the hole 120x on the peripheral surface of the dust cover 110, the dust cover 110 can be stably assembled to the frame body 120. (See, for example, Patent Document 1).

JP-A-2010-78080

However, the present inventor has found that there are the following problems in assembling the dust cover 110 in the conventional strut type suspension. That is, as shown in FIG. 3, it is generally difficult to fit the synthetic resin dust cover 110 into the metal frame 120 from the outside with good workability, but conversely, it is difficult to fit the dust cover 110 inside the frame 120 with good workability. When the above is used, the dust cover contracts due to the temperature environment outside the vehicle, causing problems such as falling off from the frame or generation of abnormal noise due to improper fitting.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an assembling structure of a dust cover capable of stably assembling a dust cover with good workability.

In order to achieve the above object, the first aspect of the present invention includes a metal cup-shaped frame and a synthetic resin dust cover whose tip is fitted inside the frame, and the dust. The cover has a first protrusion formed on a surface facing the inner peripheral surface of the frame body and a surface facing the inner peripheral surface of the frame body on the surface on which the first protrusion is formed. On the other hand, it has a second protrusion formed on a surface separated along the extending direction of the dust cover, and the first protrusion of the dust cover is engaged with the inner peripheral surface of the frame body. The recess or through hole to be combined is formed, and the second protrusion is an assembly structure of a dust cover in a vehicle suspension that is elastically in contact with the inner peripheral surface of the frame body.

Further, as another aspect of the present invention, the first protrusion and the second protrusion of the cylinder may be arranged in columns along the extending direction of the cylinder.

Further, as another aspect of the present invention, the shock absorber included in the suspension of the vehicle, the piston rod, the upper support fixed to the tip of the piston rod, and the dust cover on each side surface of the present invention are assembled. The piston rod may be a shock absorber having a structure, the piston rod is inserted in the dust cover, and the upper support is fixed to the bottom surface of the frame body.

The present invention as described above has an effect that the dust cover can be assembled stably with good workability.

Partial sectional view which shows the structure of the assembly structure of the dust cover which concerns on embodiment of this invention. The plan view which shows the structure of the assembly structure of the dust cover which concerns on embodiment of this invention. Cross-sectional view showing the configuration of a conventional strut suspension

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing the configuration of the dust cover assembly structure 1 according to the embodiment of the present invention, and FIG. 2 is a plan view based on the arrow A in FIG. However, in each figure, the same or equivalent configurations as those of the conventional example shown in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted. Further, in FIG. 1, the right half is shown as a partial cross-sectional view showing the surface and the left half is shown as an internal structure.

As shown in each figure, the dust cover assembly structure 1 of the present embodiment is mounted on the shock absorber of the strut type suspension, covers the piston rod 130 of the suspension, and has a tubular dust cover 10 for protecting the piston rod 130. A cup-shaped frame 20 that is assembled to the dust cover 10 and fixed to the upper support 140 of the suspension is provided as a main configuration.

The dust cover 10 is a member made of synthetic resin formed by blow molding as in the conventional example, and is assembled to the frame body 20 by fitting the tip portion inside the frame body 20.

In the dust cover 10, the fitting portion with the frame body 20 is located at the tip of the dust cover 10 and has an outer diameter substantially the same as the inner diameter of the frame body 20 and the first outer peripheral surface 10a and the dust cover 10. It is partitioned by a second outer peripheral surface 10b having an outer diameter less than the inner diameter of the frame body 20 located directly below the first outer peripheral surface 10a along the extending direction. Further, the bottom surface 10c is a portion corresponding to the end face portion of the tubular shape, and at least an opening for inserting the piston rod 130 is formed. However, the bottom surface 10c is not essential and may be omitted.

At the boundary between the first outer peripheral surface 10a and the second outer peripheral surface 10b, an engaging protrusion 11 is projected at a position that substantially divides the entire circumference of the dust cover 10 into three equal parts. The engaging protrusion 11 is a portion having a substantially rectangular planar shape and a substantially trapezoidal cross-sectional shape in which the protruding dimension gradually decreases toward the tip of the dust cover 10, and is fitted into the opening 20x of the frame body 20 described later. Then, the entire tip is exposed to the outside.

On the circumference of the second outer peripheral surface 10b, the contact projection 12 is projected at a position that substantially divides the entire circumference of the dust cover 10 into six equal parts. The abutting protrusion 12 is a portion having a substantially spherical shell-like cross-sectional shape having a substantially circular planar shape. The distance between the top of the abutting protrusion 12 and the central axis of the dust cover 10 is determined to be larger than the radius of the inner peripheral surface 20b of the frame body 20, which will be described later. Therefore, in a state where the dust cover 10 is fitted into the frame body 20, the second outer peripheral surface 10b is deformed in a direction of contracting toward the central axis, and the contact projection 12 is elastically with respect to the inner peripheral surface 20b. Abut.

Further, a part of the engaging protrusion 11 and the abutting protrusion 12 are arranged in columns at the same position in the plan view of FIG. 2, that is, on the same line along the extending direction of the dust cover 10 at predetermined intervals as shown in FIG. Be placed.

The frame body 20 is a metal member similar to the conventional example, and forms an inner diameter portion facing the first outer peripheral surface 10a and the second outer peripheral surface 10b in a fitted state with the dust cover 10. It is divided into a peripheral surface 20b, an outer peripheral surface 20a forming an outer peripheral portion, and a bottom surface 20c facing the bottom surface 10c of the dust cover 10. The outer peripheral surface 20a and the inner peripheral surface 20b are portions corresponding to the side wall portion of the cup shape, and the opening 20x as a through hole having a substantially rectangular planar shape corresponding to the position and shape of the engaging projection 11 of the dust cover 10. Is formed. The bottom surface 20c may have at least an area through which the piston rod 130 can be inserted and can be joined to the upper support 140.

In the above configuration, the dust cover assembly structure 1 corresponds to the dust cover assembly structure of the present invention, the dust cover 10 corresponds to the dust cover of the present invention, and the frame body 20 corresponds to the frame body of the present invention. Further, the engaging protrusion 11 corresponds to the first protrusion of the present invention, and the contact protrusion 12 corresponds to the second protrusion of the present invention.

The dust cover assembly structure 1 according to the present embodiment has the above configuration, and thus the frame body is formed by the engaging protrusion 11 in a state where the dust cover 10 is fitted to the inner peripheral surface 20b of the frame body 20. The contact projection 12 elastically contacts the inner peripheral surface 20b of the frame body 20 while engaging with the opening 20x of 20. This makes it possible to assemble the dust cover stably with good workability.

That is, in the present embodiment, the dust cover 10 made of synthetic resin is fitted into the inner peripheral surface 20b of the metal frame 20 so that the dust cover 10 having low rigidity is on the coaxial inner peripheral side. As a result, the workability of fitting is improved.

On the other hand, when the temperature is low due to the influence of the temperature environment outside the vehicle, specifically, cold regions, running wind, etc., the synthetic resin dust cover 10 shrinks relatively significantly with respect to the metal frame 20. Then, the first outer peripheral surface 10a and the second outer peripheral surface 10b recede from the inner peripheral surface 20b of the frame body 20 toward the central axis, but the engaging projection 11 is in an engaged state with the opening 20x of the frame body 20. The dust cover 10 is prevented from falling off from the frame body 20 by holding the dust cover 10.

Further, while the first outer peripheral surface 10a and the second outer peripheral surface 10b recede, the contact projection 12 remains elastically in contact with the inner peripheral surface 20b on the second outer peripheral surface 10b. By dripping, the improper fitting of the dust cover 10 and the frame body 20 is eliminated, and the generation of abnormal noise can be suppressed. In particular, as shown in FIG. 2, the engaging protrusions 11 and the abutting protrusions 12 are arranged in tandem on the same line at predetermined intervals, so that the engaging protrusions 11 and the contact protrusions 12 are arranged against the swing of the suspension. The two contact protrusions 12 come into contact with the frame 20 at the same time, and the dust cover 10 can be stably held.

Further, in the present embodiment, the engaging protrusion 11 has a substantially trapezoidal cross-sectional shape in which the protrusion dimension gradually decreases toward the tip of the dust cover 10, so that the dust cover 10 is inserted into the frame 20 in the insertion direction. The first outer peripheral surface 10a and the second outer peripheral surface 10b can be easily deformed, and the workability of fitting can be improved.

Further, in the present embodiment, the engaging projection 11 has the following effects when the entire tip thereof is exposed to the outside through the opening 20x. That is, when the opening 20x of the frame body 20 is created by press working as an example, the peripheral edge 20x1 may be formed into a sharp shape, and care may be required in handling the suspension after completion. According to the present embodiment, the engaging protrusion 11 protrudes from the peripheral edge 20x1 of the opening 20x at an arbitrary position, reducing the possibility that the peripheral edge 20x1 of the opening 20x comes into direct contact with the outside, and handling the suspension after completion. Can be facilitated.

The height of the engaging protrusion 11, that is, the dimension from the root to the tip is preferably set to have a predetermined tightening allowance in consideration of the shrinkage dimension of the dust cover 10. As an example, the dimensions of the engaging protrusion 11 from the root may be set to be equal to or larger than (expansion rate of frame 20-expansion rate of dust cover 10) x radius of dust cover 10 x (normal temperature-lower limit operating temperature). preferable. Here, the "radius of the dust cover 10" is the position of the root of the engaging protrusion 11, and is determined based on the position on the side surface of the dust cover 10 provided with the engaging protrusion 11. In the case of the present embodiment, it is preferable to use the average of the sums of the radii of the first outer peripheral surface 10a and the second outer peripheral surface 10b.

As described above, according to the dust cover assembling structure 1 of the present embodiment, it is possible to assemble the dust cover stably with good workability.

However, the present invention is not limited to the above embodiments. In the above description, the engaging protrusion 11 is projected at a position that roughly divides the entire circumference of the dust cover 10 into three equal parts, and the contact protrusion 12 is projected at a position that roughly divides the entire circumference of the dust cover 10 into six equal parts. However, the number of each protrusion and the arrangement on the circumference may be arbitrary, and the planar shape may also be arbitrary. Further, although a part of the engaging protrusion 11 and the abutting protrusion 12 are arranged at the same position in the plan view of FIG. 2, all of them may be arranged at different positions in the plan view.

Further, in the above description, the engaging protrusion 11 of the dust cover 10 is assumed to engage with the opening 20x as a through hole on the frame body 20, but the frame body 20 is provided with a recess on the inner peripheral surface 20b. , The engaging protrusion 11 may have a height sufficient to fit into the recess.

Further, in the above description, the dust cover assembly structure 1 of the present embodiment is mounted on the shock absorber of the strut type suspension, but the present invention has a metal cup-shaped frame and a metal cup-shaped frame. Any machine may be used as long as it includes an assembling structure of a dust cover including a dust cover made of synthetic resin whose tip is fitted inside the frame.

As described above, the present invention has a structure for assembling a dust cover in a vehicle suspension , and comprises a metal cup-shaped frame and a synthetic resin dust cover whose tip is fitted inside the frame. The dust cover is provided with a first protrusion formed on a surface facing the inner peripheral surface of the frame body and a surface facing the inner peripheral surface of the frame body, and the first protrusion is formed. It has a second protrusion formed on a surface separated from the surface formed along the extending direction of the dust cover, and the inner peripheral surface of the frame has the first surface of the dust cover. A recess or a through hole is formed in which the protrusion of the above is engaged, and the second protrusion may be elastically in contact with the inner peripheral surface of the frame body, and other specific purposes , Not limited by application and configuration.

Therefore, the present invention may be carried out as if various modifications were made to the above-described embodiment, including those described above, as long as the present invention does not deviate from the gist thereof.

The present invention as described above has an effect that the dust cover can be assembled stably with good workability, and is useful, for example, in application to a strut type suspension of an automobile.

1 Dust cover assembly structure 10 Dust cover 10a First outer peripheral surface 10b Second outer peripheral surface 10c, 20c Bottom surface 11 Engagement protrusion 12 Contact protrusion 20 Frame body 20a Outer outer surface 20b Inner peripheral surface 20x Opening 20x1 Peripheral 130 Piston rod 140 upper support

Claims (1)

With a metal cup-shaped frame
A dust cover made of synthetic resin whose tip is fitted inside the frame is provided.
The dust cover includes a first protrusion formed on a surface facing the inner peripheral surface of the frame body, and
With the second protrusion formed on the surface facing the inner peripheral surface of the frame and separated from the surface on which the first protrusion is formed along the extending direction of the dust cover. Have,
A recess or a through hole with which the first protrusion of the dust cover is engaged is formed on the inner peripheral surface of the frame.
The second protrusion is elastically in contact with the inner peripheral surface of the frame body.
Assembly structure of dust cover in vehicle suspension .

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