JPH08200423A - Press rod guide - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rod guide made of a press for a shock absorber capable of ensuring a large rigidity by simple processing. A rod guide made of press according to the present invention includes an outer case fitting portion 4 and an inner cylinder fitting portion 5, an oil seal holding portion 7 holding an oil seal 6, a sliding portion 9 supporting a piston rod 8 and the like. The plate material is bent and formed by press molding. Inner cylinder fitting part 5
The outer case fitting portion oil passage 10 that communicates the upper and lower sides of the above, a holding portion oil groove 12 that communicates the oil seal chamber 11 that houses the oil seal 6 and the outer case fitting portion oil passage 10, The fitting part oil passage 10 is formed by bending a part of the outer case fitting part 4 in a straight line at four positions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press rod guide for a shock absorber, and more particularly to a press rod guide for a shock absorber capable of ensuring a large rigidity by simple processing.

[0002]

2. Description of the Related Art A rod guide of a shock absorber formed by press working (for example, Japanese Patent Application No. 5-61215) is known. A press rod guide 54 that slidably supports a piston rod 53 is fitted to the ends of the outer case 51 and the inner cylinder 52 of the shock absorber, and the press rod guide 54 is an oil seal on the opening end side of the cylinder. A holding portion 56 provided inside 55 and holding the oil seal 55, fitting portions 57 and 58 for the inner cylinder 52 or the outer case 51 are provided, and the holding portion 56 and a part of the outer case fitting portion 58 are provided. Groove 56a,
58a is formed. These grooves 56a and 58a form an oil passage for returning the working oil from the oil seal chamber 55a that houses the oil seal 55 to the oil chamber 59 that forms the outer peripheral portion of the inner cylinder 52. The rod guide 54 includes the sliding portion 60,
It is formed by press working by bending the plate material.

[0003]

However, since the rod guide formed by press forming is restricted by the thickness of the plate material suitable for bending, the rigidity of the rod guide can be suppressed within a certain range, and the rod guide is bent to a certain extent. Its application was limited to models in which a large lateral force acts on the rod guide, such as when a moment acts. In addition, since the fitting portion of the outer case requires processing for forming the oil passage, the processing advantage of the press molding has been diminished. It is an object of the present invention to solve problems such as rigidity while taking advantage of the workability of a rod guide by press molding.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, a first invention is an outer case fitting which closes the ends of an outer case and an inner cylinder which are concentric double cylinders, and is fitted to the inner circumference of each. The mating portion and the inner cylinder fitting portion, the oil seal holding portion that holds an oil seal outside between the outer case fitting portion and the inner cylinder fitting portion, and the piston rod at the center position of the inner cylinder fitting portion. In a rod guide made of press formed by bending a plate material, a sliding portion supporting the outer case fitting portion oil passage that communicates the upper and lower parts of the outer case fitting portion, the outer case fitting portion oil passage, and the outer case fitting portion oil passage. An oil groove for a holding portion that traverses the oil seal holding portion is formed to communicate with an oil seal chamber that accommodates an oil seal, and the outer case fitting is formed. Parts oil passage is formed by bending a part of the outer periphery of the engagement portion fitted outer case. The outer case fitting portion oil passage may be formed by linearly bending one or more parts of the outer case fitting portion, and the outer case fitting portion may be folded along the outer case. It can be bent, and the bent portion along the outer case may be formed by tapering the diameter.

An outer case fitting part and an inner cylinder fitting part that close the ends of the outer case and the inner cylinder, which are concentric double cylinders, and fit with the inner circumferences thereof, respectively, and the outer case fitting part and the inner cylinder. An oil seal holding portion that holds an oil seal outside between the cylinder fitting portions, a standing portion that connects the inner peripheral side of the oil seal holding portion and the inner cylinder fitting portion, and an inner cylinder fitting portion. In a rod guide made of press formed by bending a plate material, a sliding portion supporting a piston rod at the center position of the joint portion, the lower end of the sliding portion is connected to the inner cylinder fitting portion, and the upper end is the same inner portion. It is formed by connecting the cylinder fitting portion and the upright portion or one of them on the entire circumference or on one or more parts thereof. The connecting portion at the upper end of the sliding portion can be formed by integrally bending the sliding portion, the inner cylinder fitting portion and the rising portion or a part thereof, and the connecting portion at the upper end of the sliding portion can be formed. The part can be formed by a separate annular member.

An outer case fitting portion and an inner cylinder fitting portion that close the ends of the outer casing and the inner cylinder that form a concentric double cylinder and fit with the inner circumferences thereof, and the outer case fitting portion and the inner cylinder. An oil seal holding portion that holds an oil seal outside between the cylinder fitting portions, a standing portion that connects the inner peripheral side of the oil seal holding portion and the inner cylinder fitting portion, and an inner cylinder fitting portion. A press rod guide having a sliding portion for supporting a piston rod formed at a center position of a joint portion by bending a plate material, wherein an upper end of an inner cylinder fitting portion and an outer case are crossed across the rising portion and the oil seal holding portion. A holding portion oil groove that linearly communicates the step between the fitting portion and the fitting portion is formed, and the wall portion and the bottom portion of the holding portion oil groove are used as the strength member.

[0007]

According to the first aspect of the present invention, the oil groove of the oil seal holding portion and the outer case fitting portion oil passage are formed, and the outer case fitting portion oil passage is formed by bending the outer periphery of the outer case fitting portion. Since it is formed by, it is possible to efficiently perform the pressing process including the case where one or more parts of the outer case fitting part are bent linearly or the outer case fitting part is bent along the outer case. The outer case fitting part oil passage can be formed, the bent part ensures a large rigidity, and the degree of freedom of the position where the holding part oil groove is formed is improved, so that restrictions on molding can be suppressed. Processing becomes easier. In this case, the work efficiency of fitting and assembling with the outer case is improved by forming the bent portion of the outer case fitting portion by tapering the diameter, and it is not necessary to perform highly accurate positioning. Therefore, automatic assembly can be simplified.

According to a second aspect of the present invention, since the upper and lower ends of the sliding portion are formed by connecting with the inner cylinder fitting portion and the like, the connecting portion at the upper end is formed by a separate annular member, The upper and lower ends of the sliding part are supported by the inner cylinder fitting part, etc., so that large rigidity in the radial direction is ensured, and oil leakage and the like can be prevented by improving the positioning accuracy of the piston rod. When the connecting portion is integrally formed with the sliding portion and the like by bending, it can be efficiently processed by a series of bending steps.

A third aspect of the invention is to form a holding portion oil groove that linearly communicates a step between the upper end of the inner cylinder fitting portion and the outer case fitting portion across the upright portion and the oil seal holding portion. However, since the wall portion and the bottom portion of the holding portion oil groove are made of the strength member, the strength member ensures large rigidity in the axial direction and the radial direction.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a sectional view of a rod guide portion of a shock absorber according to the first invention, a plan view of the rod guide, and a perspective view, and FIG. 2 is a plan view of a rod guide according to a second embodiment of the invention.

The press rod guide 1 of the present invention is shown in FIG.
Outer case 2 forming a concentric double cylinder of the hydraulic shock absorber
And between the outer case fitting portion 4 and the inner cylinder fitting portion 5 that close the ends of the inner cylinder 3 and fit with the respective inner circumferences, and between the outer case fitting portion 4 and the inner cylinder fitting portion 5. The oil seal holding portion 7 that holds the support plate 6a of the oil seal 6 outward, and the piston rod 8 at the center position of the inner cylinder fitting portion 5
And a sliding portion 9 for supporting the oil seal 6, and is bent by press forming of a plate material, and is fixed together with the support plate 6a of the oil seal 6 by caulking the end portion of the outer case 2.

The press rod guide according to the first aspect of the present invention includes an outer case fitting portion oil passage 10 that communicates the upper and lower sides of the outer case fitting portion 4, an oil seal chamber 11 that houses the oil seal 6, and an outer case fitting portion. A holding portion oil groove 12 that traverses the oil seal holding portion 7 to communicate with the joint portion oil passage 10 is provided, and the outer case fitting portion oil passage 10 is formed by bending the outer case fitting portion 4. .

The outer case fitting portion oil passage 10 is formed by linearly bending a part of the outer case fitting portion 4 at one or more places, for example, four places. Holding part oil groove 1
2 is formed so as to face any of the outer case fitting portion oil passages 10 of FIG. 2B, or is formed by removing the position of the outer case fitting portion oil passages 10 of the rod guide of FIG.

The outer case fitting portion oil passage of the press rod guide thus constructed is formed by bending the outer periphery of the outer case fitting portion, so that at least one part of the outer case fitting portion is formed. The outer case fitting part oil passage can be formed efficiently by the pressing process, including the case where the outer case fitting part is bent linearly, and the bent part ensures a large rigidity. Since the degree of freedom of the position of is improved, restrictions at the time of molding are suppressed, and processing becomes easier.

FIG. 3 is a detailed sectional view of the rod guide portion according to the third embodiment. The outer case fitting portion 4 of the rod guide is a bent portion 14 bent along the outer case 2 as shown in FIG. 3, and the outer case fitting portion oil passage 10 is linearly bent and formed in a part thereof. . In this case, it is preferable that the bent portion 14 along the outer case 2 is formed by tapering the diameter.

The outer case fitting portion 4 of this rod guide has a bent portion 14 and an outer case fitting portion oil passage 10.
With the bent portion that forms a large rigidity, the bent portion 14 formed by tapering to reduce the diameter facilitates fitting and assembling with the outer case 2 and improves work efficiency. In addition, since automatic positioning is not required, automatic assembling can be simplified.

Next, the rod guide according to the second invention will be described. 4 is a sectional view of a rod guide portion of a shock absorber according to the invention, FIG. 5 is a plan view of the rod guide, FIG. 6 is a sectional view of a rod guide portion according to a second embodiment of the present invention, and FIG. 7 is the same invention. Sectional view of a rod guide portion and a plan view of a rod guide according to a third embodiment of the present invention, FIG. 8 is a sectional view of a rod guide portion according to a fourth embodiment of the present invention, and FIG. 9 relates to a fifth embodiment of the same invention. It is a cross-sectional view of the rod guide portion, the above-mentioned members are given the same reference numerals, and the description thereof is omitted.

The press rod guide of the present invention is provided with an upright portion 16 that rises from the end of the inner cylinder fitting portion 9 of FIG. 4 to define the oil seal chamber 11, and is bent by press forming a plate material. It

A lower end of the sliding portion 9 is integrally formed by bending by connecting with the inner cylinder fitting portion 5, and an upper end of the sliding portion 9 forms a connecting portion 17 which is bent toward the rising portion 16 and the entire circumference of the edge thereof. 5 and abuts against the upright portion 16, or FIG.
A part of the structure is left as shown in (a), and one part or more of the part is contacted with the part as shown in FIG.

The connecting portion 17a according to the second embodiment is shown in FIG.
The inner cylinder fitting portion 5 shown in FIG.
Further, the connecting portion 17b according to the third embodiment partially projects the inner cylinder fitting portion 5 shown in FIG. 7 inward and abuts the sliding portion, or the connecting portion according to the fourth embodiment. Part 1
Reference numeral 7c is a separate annular member shown in FIG. 8, and the connecting portion 17d according to the fifth embodiment is formed by injection molding the above annular member of the synthetic resin material shown in FIG.

The rod guide made of a press constructed as described above is formed by connecting the upper and lower ends of the sliding portion 9 with the inner cylinder fitting portion 5 and the like, and thereby the connecting portion 1 at the upper end thereof.
Including the case where 7, 17a, 17b, 17c, 17d form a separate annular member, the sliding portion 9 is supported by the inner cylinder fitting portion 5 and the like at the upper and lower ends thereof, so that a large radial rigidity is secured. At the same time, it is possible to prevent oil leakage etc. by improving the positioning accuracy of the piston rod, and in the case where the connecting part at the upper end is formed by bending together with the sliding part, etc. It can be processed.

The rod guide according to the third invention will be described. FIG. 10 is a cross-sectional view of the rod guide portion and a plan view of the rod guide according to the third aspect of the present invention. The above-mentioned members are given the same reference numerals and the description thereof is omitted.

In the standing portion 16 and the oil seal holding portion 7 of the rod guide according to the present invention, a step between the upper end of the inner cylinder fitting portion 5 and the outer case fitting portion 4 is linearly crossed across them. The holding portion oil groove 18 that communicates is formed.
This rod guide has a wall portion and a bottom portion of the holding portion oil groove 18 as strength members, and the strength members ensure great rigidity in the axial direction and the radial direction.

[0024]

As described above, according to the first aspect of the invention, the oil groove of the oil seal holding portion and the oil passage of the outer case fitting portion are formed, and the oil passage of the outer case fitting portion is the outer passage. By forming the outer circumference of the case fitting part by bending, one or more parts of the outer case fitting part can be bent linearly or the outer case fitting part can be bent along the outer case. Including the case of processing, the outer case fitting part oil passage can be formed efficiently by the pressing process, the bent part ensures great rigidity, and the degree of freedom of the position of forming the holding part oil groove Is improved, so that restrictions on molding are suppressed and processing becomes easy. In this case, the work efficiency of fitting and assembling with the outer case is improved by forming the bent portion of the outer case fitting portion by tapering the diameter, and it is not necessary to perform highly accurate positioning. Therefore, automatic assembly can be simplified.

According to a second aspect of the invention, the upper and lower ends of the sliding portion are formed by being connected to the inner cylinder fitting portion and the like, so that the connecting portion at the upper end is formed by a separate annular member. The upper and lower ends of the sliding part are supported by the inner cylinder fitting part, etc., so that large rigidity in the radial direction is ensured, and oil leakage and the like can be prevented by improving the positioning accuracy of the piston rod. When the connecting portion is integrally formed with the sliding portion and the like by bending, it can be efficiently processed by a series of bending steps.

According to a third aspect of the invention, a holding portion oil groove is formed which linearly communicates a step between the upper end of the inner cylinder fitting portion and the outer case fitting portion across the upright portion and the oil seal holding portion. However, since the wall portion and the bottom portion of the holding portion oil groove are made of the strength member, the strength member ensures large rigidity in the axial direction and the radial direction.

Therefore, in the processing of the rod guide, the rigidity of the rod guide can be improved while avoiding the change of the damping characteristic over time, and the durability can be improved while taking advantage of the workability of the press molding, resulting in low cost. The hydraulic shock absorber can ensure the steering stability of the vehicle.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rod guide portion of a shock absorber according to a first aspect of the invention, a plan view of the rod guide, and a perspective view.

FIG. 2 is a plan view of a rod guide according to a second embodiment of the present invention.

FIG. 3 is a detailed sectional view of a rod guide portion according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a rod guide portion of a shock absorber according to a second invention.

FIG. 5 is a plan view of the rod guide.

FIG. 6 is a sectional view of a rod guide portion according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a rod guide portion and a plan view of the rod guide according to a third embodiment of the present invention.

FIG. 8 is a sectional view of a rod guide portion according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view of a rod guide portion according to a fifth embodiment of the present invention.

FIG. 10 is a sectional view of a rod guide portion of a shock absorber according to a third invention.

FIG. 11 is a plan view of the rod guide.

[Explanation of symbols]

1 ... Rod guide, 2 ... Outer case, 3 ... Inner cylinder, 4 ... Outer case fitting part, 5 ... Inner cylinder fitting part, 6 ... Oil seal, 6a ... Support plate, 7 ...
Oil seal holding part, 8 ... Piston rod, 9 ... Sliding part, 10 ... Outer case fitting part oil passage, 11 ... Oil seal chamber, 12 ... Holding part oil groove, 14 ... Bent part, 16 ... Standing part, 17, 17a, 17b, 17c, 17d ... Connection portion, 18 ... Holding portion oil groove.

Claims (8)

[Claims] 1. An outer case fitting part and an inner cylinder fitting part that close the ends of an outer case and an inner cylinder, which are concentric double cylinders, and fit with the inner circumferences thereof, and these outer case fitting parts. And a press-molded product in which an oil seal holding part that holds an oil seal outside between the inner cylinder fitting part and a sliding part that supports the piston rod at the center position of the inner cylinder fitting part are formed by bending the plate material. In the rod guide, the outer case fitting part oil passage that communicates with the upper and lower parts of the outer case fitting part and the oil seal holding to connect the outer case fitting part oil passage and the oil seal chamber that accommodates the oil seal The outer case fitting part oil passage is formed by bending a part of the outer circumference of the outer case fitting part. A press-made rod guide characterized by being formed by processing. 2. The press-made rod guide according to claim 1, wherein the outer case fitting portion oil passage is formed by linearly bending one or more parts of the outer case fitting portion. A rod guide made of press. 3. The press rod guide according to claim 2, wherein the outer case fitting portion is formed by bending along the outer case. 4. The press rod guide according to claim 3, wherein a bent portion of the outer case fitting portion along the outer case is tapered and reduced in diameter. . 5. An outer case fitting part and an inner cylinder fitting part that close the ends of the outer case and the inner cylinder, which are concentric double cylinders, and fit with the inner circumferences thereof, respectively, and these outer case fitting parts. And an oil seal holding portion that holds an oil seal outside between the inner cylinder fitting portion, a standing portion that connects the inner peripheral side of the oil seal holding portion and the inner cylinder fitting portion, In a press rod guide in which a sliding portion supporting a piston rod is formed at a center position of a cylinder fitting portion by bending a plate material, a lower end of the sliding portion is connected to the inner cylinder fitting portion, and an upper end thereof is A press product characterized by being formed by connecting the inner cylinder fitting portion and the upright portion or one of them to the entire circumference or at least one portion thereof. Rod guide. 6. The press rod guide according to claim 5, wherein the connecting portion at the upper end of the sliding portion is integrally bent by the sliding portion, the inner cylinder fitting portion and the rising portion or a part thereof. A rod guide made of a press, characterized by being formed by. 7. The press rod guide according to claim 5, wherein the connecting portion at the upper end of the sliding portion is formed by a separate annular member. 8. An outer case fitting part and an inner cylinder fitting part, which close the ends of the outer case and the inner cylinder forming a concentric double cylinder and are fitted to the inner circumferences thereof, respectively, and these outer case fitting parts. And an oil seal holding portion that holds an oil seal outside between the inner cylinder fitting portion, a standing portion that connects the inner peripheral side of the oil seal holding portion and the inner cylinder fitting portion, In a press-made rod guide in which a sliding portion supporting a piston rod is formed at a center position of a cylinder fitting portion by bending a plate material, the upper end of the inner cylinder fitting portion is crossed across the rising portion and the oil seal holding portion. An oil groove for the holding portion that linearly communicates the step between the outer case fitting portion and the outer case fitting portion is formed, and the wall portion and the bottom portion of the oil groove for the holding portion are used as strength members. A featured press rod guide.