JPH102370A - Hydraulic damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic damper to reduce weight and cost as a rigidity strength against a bending moment in the lateral direction of a vehicle is improved. SOLUTION: A fixing bracket 2 comprises a cylinder part 21 having a notch part (a) formed in a part thereof and pressed in the lower end part of an outer cylinder 1; and a pair of mounting flange parts 22 and 22 extending in parallel to each other from the two edges of the notch part (a) of the cylinder part 21. Two plate parts respectively connected to the two edges of the two notch part (a) on the upper end side of the cylinder part 21 and the upper edge parts of the two flange parts 22 and 22 folded in a direction, in which a distance therebetween is decreased to a value lower than a distance between the two mounting flange parts 22 and 22, along the outer peripheral surface of the outer cylinder 1 to form a pair of lock ribs 27 and 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic shock absorber, and more particularly to an improved technique of a fixing bracket structure.

[0002]

2. Description of the Related Art Conventionally, as a fixing bracket structure in such a hydraulic shock absorber, for example, Japanese Utility Model Laid-Open No.
A structure as described in JP-A-120404 is known. The fixing bracket in the conventional hydraulic shock absorber includes a cylindrical portion having a partially cutout portion along a circular outer peripheral surface at a lower end portion of an outer cylinder, and a mounting flange extending in parallel from both end edges of the cutout portion of the cylindrical portion. A concave portion is formed in the outer cylinder at a position corresponding to the cutout portion in the cylindrical portion, and a concave portion formed in the outer peripheral surface of the outer cylinder is fitted into the cylindrical portion-side base end portions of both mounting flange portions. In the locked state, a pair of locking ribs protruding in the direction of the notch are formed.

That is, in this conventional example, the inner bracket can be omitted from the fixing bracket, which has conventionally been constituted by two members, the outer bracket and the inner bracket, by the pair of locking ribs. Thus, there is an advantage that the cost can be reduced by reducing the cost.

[0004]

However, the structure of the above-described conventional hydraulic shock absorber has the following problems. That is, in a hydraulic shock absorber of a type in which the fixing bracket is attached to the unsprung knuckle, the bolt fastening position of the fixing bracket with respect to the unsprung knuckle is set at a position eccentric to the outside of the axis of the hydraulic shock absorber. In addition, since the hydraulic shock absorber is attached in a state inclined in the left-right direction of the vehicle, a bending moment in the left-right direction acts on the lower end of the outer cylinder to which the fixing bracket is attached during bouncing of the vehicle, During the pressure stroke of the hydraulic shock absorber, especially on the upper side of the fixing bracket,
A bite of the outer cylinder causes a force in a direction to widen the gap between the two mounting flanges. However, in the conventional hydraulic shock absorber, the concave portion of the outer cylinder and the locking ribs engaged with the concave portion of the outer cylinder are moved up and down in the fixing bracket. Since it is formed at the center between the two bolt insertion holes, it is not possible to effectively prevent the outer cylinder from biting between the two mounting flanges when a bending moment acts in the vehicle left-right direction. Thus, the stability of the vehicle at the time of cornering is reduced. Further, in order to secure rigidity and strength against bending moment in the lateral direction of the vehicle, it is necessary to make the locking rib contact the outer cylinder as much as possible on the notch side. Since it is an intermediate part, ensure the dimensions of both mounting flanges,
When trying to make the diaphragm deeper, the plate thickness becomes thinner and the rigidity of the locking rib part decreases, so that it is necessary to use a thicker plate material for the fixing bracket,
Material costs and processing costs are high, and this is against the demand for weight reduction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a hydraulic pressure capable of reducing weight and cost while increasing rigidity and strength against bending moment in the lateral direction of the vehicle. It is an object to provide a shock absorber.

[0006]

In order to achieve the above object, in the hydraulic shock absorber according to the first aspect of the present invention, the fixing bracket has a notch at a part where the lower end of the outer cylinder is press-fitted. A cylindrical portion having a portion, and a pair of mounting flange portions extending in parallel with each other from both ends of the notch portion in the cylindrical portion, and both ends of both notches and both mounting flange portions on the upper end side of the cylindrical portion. A pair of locking ribs are formed by folding both plate material portions respectively connected to the upper end edge in a direction along the outer peripheral surface of the outer cylinder in a direction in which the distance between the two mounting flange portions is smaller than the distance between the two mounting flange portions. That means.

[0007]

As described above, the bolt fastening position of the fixing bracket with respect to the unsprung knuckle is eccentric to the outside of the axis of the hydraulic shock absorber, and the hydraulic shock absorber is inclined in the left-right direction of the vehicle. Because it is mounted in a state (see FIG. 1), a bending moment in the left-right direction acts on the lower end of the outer cylinder on which the fixing bracket is mounted during bouncing of the vehicle, and during the pressure stroke of the hydraulic shock absorber, In particular, the upper part of the fixing bracket receives a force in the direction of increasing the distance between the two mounting flanges due to the biting of the outer cylinder.
The outer cylinder is received by the two locking ribs formed above the two mounting flanges in which the bolt insertion holes are formed, so that the engagement between the two mounting flanges is prevented.

In other words, since both locking ribs function as the inner bracket, the number of the inner brackets is reduced, whereby the weight and cost can be reduced. Also,
The both locking ribs are formed by bending the both plate portions which are respectively connected to the both edges of both the cutout portions on the upper end side of the cylindrical portion and the upper edge portions of both the mounting flange portions, so that the plate thickness is reduced. This makes it possible to form the locking ribs without using any of the fixing ribs.
Strength can be secured. That is, material costs and processing costs are reduced.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment of the Invention) First, the configuration of a hydraulic shock absorber according to a first embodiment of the invention shown in FIGS. 1 to 5 will be described. FIG. 1 is a partially cutaway front view showing a mounted state of a hydraulic shock absorber according to Embodiment 1 of the present invention, FIG. 2 is a view of a fixing bracket portion as viewed from an arrow B in FIG. 1, and FIG. 4 is a cross-sectional plan view taken along the line IV-IV in FIG. 1, FIG. 5 is a cross-sectional plan view taken along the line VV in FIG.
In these figures, 1 is an outer cylinder of a hydraulic shock absorber, 2 is a fixing bracket, 3 is a cylinder, 4 is a piston rod, 5 is a piston, 6 is a rod guide, 7 is a base valve, and 8 is a spring seat. ing.

The outer cylinder 1 is formed in a substantially cylindrical shape. In particular, the outer periphery of the lower end on which the fixing bracket 2 is mounted is formed in a uniform circular shape (see FIGS. 3 to 5). The fixing bracket 2 is formed by bending a single plate material, and is shown in FIGS.
As shown in FIG. 1, a cylindrical portion 21 having a partially cut-out portion a along a circular outer peripheral surface at a lower end portion of the outer cylinder 1 and a pair of integrally extending parallel to each other from both end edges of the cut-out portion a in the cylindrical portion 21. And two plate material portions connected to the both ends of the notch a at the upper end side of the cylindrical portion 21 and the upper end edges of the two mounting flange portions 22, 22, respectively. A pair of locking ribs 27, 27 that are folded along the outer peripheral surface of the outer cylinder 1 in a direction in which the distance between the two mounting flange portions 22, 22 is narrower than the distance between the two mounting flanges 22, 22 are integrally formed and are cylindrical. Outward ribs 23, 24 are integrally bent from the upper edge of the portion 21 to the upper edges of the locking ribs 27, 27 and the lower edge of the cylindrical portion 21 to the lower edges of the mounting flanges 22, 22. It has a structure.

More specifically, the locking ribs 27,
27 is the cylindrical portion 21 as shown in FIGS.
Of the two plate members connected to the both edges of the notch a on the upper end side and the upper end edges of the mounting flange portions 22, 22, both outer peripheral side portions are connected to the mounting flange portions 22, 22.
Is formed in a state where the intermediate portion thereof is pushed in a substantially U shape along the outer peripheral surface of the outer cylinder 1 in the direction of the notch portion a.

As shown in FIG. 1, bolt mounting holes 25, 2 are provided at two upper and lower positions in both mounting flange portions 22, 22, respectively.
6 are formed. As shown in FIGS. 2 and 4, the cylindrical portion 21 is located between the two bolt insertion holes 25 and 26.
A pair of reinforcing ribs 2 swelling in directions extending from the boundary between the mounting flanges 22 and 22 to the outside of the space between the mounting flanges 22 and 22.
8, 28 are formed.

A cylindrical portion 21 having a notch a
Is pressed into the outer periphery of the lower end of the outer cylinder 1 and the lower end of the cylindrical portion 21 and the outer cylinder 1 are fixed by welding b, whereby the fixing bracket 2 is fixedly attached to the outer cylinder 1.

Next, the operation of the first embodiment of the invention will be described. The bolt fastening position of the fixing bracket 2 with respect to the unsprung knuckle (the position of the bolt insertion holes 25 and 26) becomes a position eccentric to the outside of the axis of the hydraulic shock absorber, and as shown in FIG. Because the shock absorber is installed in a state inclined to the left and right direction of the vehicle,
When bouncing the vehicle, a bending moment in the left-right direction acts on the lower end of the outer cylinder 1 to which the fixing bracket 2 is attached, and at the time of the pressure stroke of the hydraulic shock absorber, especially at the upper side of the fixing bracket 2, 1
As a result, a force is applied in the direction of increasing the distance between the two mounting flange portions 22, 22. At this time, the outer cylinder 1 is held by the two locking ribs 27, 27 formed on the upper end side of the fixing bracket 2. As a result, the engagement between the two mounting flange portions 22, 22 is prevented. Therefore, without providing the inner bracket,
Sufficient bending rigidity and strength in the vehicle left-right direction can be secured.

The locking ribs 27, 27 are bent so as to bend both plate members provided at both ends of the notch a at the upper end side of the cylindrical portion 21 and the upper end edges of the mounting flange portions 22, 22, respectively. Since both of the locking ribs 27, 2 can be formed by working without reducing the plate thickness.
7, the rigidity and strength of the locking ribs 27 can be ensured even if the fixing bracket 2 is made of a thin plate.

In addition, the center portion is centered on the boundary between the cylindrical portion 21 and the two mounting flange portions 22, 22 at the intermediate portion between the two bolt insertion holes 25, 26, and is extended outward from the interval between the two mounting flange portions 22, 22. With the pair of reinforcing ribs 28, 28 bulging in the respective directions, the bending rigidity and strength in the vehicle front-rear direction can be increased.

As described above, in the hydraulic shock absorber according to the first embodiment of the present invention, the rigidity and strength with respect to the bending moment in the lateral direction and the longitudinal direction of the vehicle are increased, while the weight and cost are reduced. This makes it possible to achieve the effect that the conversion can be performed.

(Embodiment 2) Next, FIGS.
The hydraulic buffer according to the second embodiment of the present invention will be described. The hydraulic shock absorber according to the second embodiment of the present invention is different from the first embodiment of the present invention in that the structure of both locking ribs in the fixing bracket 2 is different. The same components are denoted by the same reference numerals, description thereof will be omitted, and only different points will be described.

FIG. 6 is an enlarged front view showing the fixing bracket 2 of the hydraulic shock absorber according to the second embodiment of the present invention, and FIG. 7 is a view C of FIG. 6 showing the fixing bracket, and FIG. FIG. 7 is a cross-sectional plan view taken along the line IIX-IIX in FIG. 6, and as shown in these figures, both locking ribs 27, 27 of the fixing bracket are
A substantially entire portion of both plate members continuously connected to both end edges of the notch a on the upper end side and the upper end edges of the mounting flange portions 22 and 22 is pushed in the notch a direction along the outer peripheral surface of the outer cylinder 1. The two end flanges are slightly folded back in the direction parallel to the mounting flanges 22 and 22. Therefore, with the hydraulic shock absorber according to the second embodiment of the present invention, substantially the same effects as those of the first embodiment of the present invention can be obtained.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the embodiments of the present invention, and design changes and the like may be made without departing from the scope of the present invention. The present invention is also included in the present invention.

[0021]

As described above, in the hydraulic shock absorber according to the first aspect of the present invention, the fixing bracket has a cylindrical portion having a cutout in a part into which the lower end of the outer cylinder is press-fitted, and the cylindrical portion has a notch. And a pair of mounting flanges extending parallel to each other from both edges of the notch portion, and are provided at both ends of the notch portion at the upper end side of the cylindrical portion and at upper edge portions of both mounting flange portions, respectively. The vehicle has a configuration in which a pair of locking ribs are formed by folding both plate portions in a direction along the outer peripheral surface of the outer cylinder in a direction to make the distance between the two mounting flanges smaller than the distance between the two mounting flanges. The effect is obtained that the weight and cost can be reduced while increasing the rigidity and strength against the bending moment in the left-right direction.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a hydraulic shock absorber according to Embodiment 1 of the present invention in a vehicle mounted state.

FIG. 2 is a view on arrow B of FIG. 1 showing a fixing bracket portion of the hydraulic shock absorber according to Embodiment 1 of the invention.

FIG. 3 is an enlarged cross-sectional plan view taken along the line III-III of FIG. 1;

FIG. 4 is an enlarged cross-sectional plan view taken along the line IV-IV in FIG. 1;

FIG. 5 is an enlarged cross-sectional plan view taken along line VV of FIG. 1;

FIG. 6 is an enlarged front view of a main part showing a fixing bracket part of a hydraulic shock absorber according to Embodiment 2 of the present invention.

FIG. 7 is a view taken in the direction of the arrow C in FIG. 6 showing a fixing bracket portion of the hydraulic shock absorber according to the second embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional plan view taken along the line IIX-IIX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Fixing bracket 21 Cylindrical part 22 Mounting flange part 25 Bolt insertion hole 26 Bolt insertion hole 27 Locking rib 28 Reinforcement rib a Notch

Claims (1)

[Claims] A fixing bracket includes a cylindrical portion having a cutout at a part into which a lower end of an outer cylinder is press-fitted, and a pair of mounting flanges extending in parallel from both ends of the cutout in the cylindrical portion. The two plate portions, which are respectively provided at both ends of both the cutouts on the upper end side of the cylindrical portion and the upper end edges of both the mounting flanges, are mutually connected along the outer peripheral surface of the outer cylinder. A pair of locking ribs formed by folding in a direction in which the distance between them is narrower than the distance between them.