JP2006200695A - Damping force generating valve structure of hydraulic shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping force generating valve structure of a hydraulic shock absorber which can be simply built in without being accompanied by displacement, between each member when being built in a piston rod, particularly between the centers of portions to stack a plurality of leaf valves. <P>SOLUTION: There is provided the damping force generating valve structure of the hydraulic shock absorber in which in an in-low portion 2 of the piston rod 1, a pressurized-side damping force generating valve 5, a piston 6 equipped with a pressurized-side and extending-side ports 6a, 6b, and an extending-side damping force generating valve 7 are sequentially stacked through mounting holes formed in each of the central portions and besides a nut 10 is screwed into the in-low portion from an upper side of the extending-side damping force generating valve 7, thus fixing each of the above members between the nut and a basial portion 2a of the in-low portion. A tubular guide member 11 inserted into the in-low portion 2 is intervened between the extending-side damping force generating valve 7 and the in-low portion 2. Then, the guide member is provided with a radial movement regulating member for regulating the radial movement of the plurality of the sheets of the leaf valves that make up the extending-side damping force generating valve and an up-and-down movement regulating member for regulating the up-and-down movement. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hydraulic shock absorber used in a suspension device of a vehicle such as an automobile, and more particularly to a damping force generation valve structure using a leaf valve provided in a piston portion thereof.

  A hydraulic shock absorber used in a suspension device of a vehicle such as an automobile has a piston portion or a base valve for appropriately reducing vibration transmitted from the road surface to the vehicle body during traveling and improving riding comfort and operability. A valve structure for generating a damping force is provided in the part.

  As this specific structure, various things can be exemplified, but as a general structure provided in the piston portion, for example, a damping force generation valve structure of a hydraulic shock absorber shown in Patent Document 1 is exemplified. Can do.

  That is, as shown in FIG. 6, the inlay portion 2 of the piston rod 1 is provided with a pressure side valve stopper 3, a spacer 4, a pressure side damping force generating valve 5 comprising a plurality of leaf valves, and pressure side and extension side ports 6a and 6b. The piston 6, the extension side damping force generating valve 7 composed of a plurality of leaf valves, the spacer 8 and the extension side valve stopper 9 are sequentially stacked through the mounting hole formed in the center thereof, and the spacer 8 The nut 10 is screwed from above, and is fixed by applying a compressive load between the above-described members and the base end portion 2a of the inlay portion 2.

Therefore, when the hydraulic shock absorber is operated, the hydraulic oil that has passed through the expansion side or compression side ports 6a and 6b by the expansion and contraction of the piston rod 1 causes the expansion side or compression side damping force generation valves 7 and 5 to bend. Generates a predetermined damping force.
Japanese Patent Laid-Open No. 11-294515 (FIG. 1)

  The damping force generating valve structure configured as described above employs the following flow work in order to improve work efficiency during assembly.

  That is, as shown in FIG. 7, the pressure side valve stopper 3, the spacer 4, the pressure side damping force generation valve with respect to a needle mountain 32 having a holding portion 31 formed in substantially the same shape as the spigot portion 2 of the piston rod 1. 5, the piston 6, the extension side damping force generation valve 7, the spacer 8 and the extension side valve stopper 9 are sequentially stacked and temporarily assembled to constitute the piston assembly 33.

  When the piston assembly 33 configured in this way is carried to the assembly process to the piston rod 1, the assembly operator grasps the piston assembly 33 with one hand and pulls it out of the needle thread 32, so Then, the nut assembly 10 is screwed to fix the piston assembly 33 to the piston rod 1 as shown in FIG.

  However, since the piston assembly 33 is temporarily assembled to the needle ridge 32 and each member is aligned and positioned by the holding portion 31, the piston assembly 33 extracted from the needle ridge 32 is used as a positioning member. It is conceivable that there is no radial holding portion 31 to cause radial misalignment between the members.

  In this case, when the piston assembly 33 is replaced with the spigot part 2 of the piston rod 1, these members and the spigot part 2 compete with each other on the sliding surface of each other, so that smooth assembly is achieved. Will not be able to.

  In particular, when the above-described radial misalignment occurs in the portion where the plurality of leaf valves and spacers 4 and 8 constituting the expansion side or compression side damping force generation valves 7 and 5 are laminated, for example, the spigot part 2 On the other hand, there is a problem that any one of the leaf valves is assembled in a tilted state, and the aimed damping force is not generated.

  Therefore, the assembly operator pulls the pressure side valve stopper 3 with the fingertip while grasping the outer periphery of the piston 6 with the abdomen of the finger, and presses the pressure side damping force generation valve 5 against the piston 6 through the spacer 4, An operation is required in which the damping force generating valve 5, the spacer 4, and the pressure side valve stopper 3 are extracted from the needle thread 32 so as not to cause misalignment with respect to the piston 6.

  However, the extension side damping force generation valve 7, the spacer 8 and the extension side valve stopper 9 stacked on the inner surface side of the piston 6 are disposed in the piston 6. There is a problem that it is difficult to take measures for regulating the deviation, and when removing from the needle ridge 32, a careful work that does not cause misalignment is required, and accordingly, the work time becomes longer and the assembly cost increases.

  Accordingly, an object of the present invention is to provide a damping force generating valve for a hydraulic shock absorber that can be easily assembled without causing misalignment between members, particularly at a portion where a plurality of leaf valves are stacked, when assembled to a piston rod. Is to provide a structure.

  In order to achieve the above object, the present invention comprises a compression side damping force generation valve comprising a plurality of leaf valves, a piston having a compression side and an extension side port, and a plurality of leaf valves with respect to the inlay portion of the piston rod. The extension side damping force generation valves are sequentially stacked through the mounting holes formed in the center thereof, and the nuts are screwed from above the extension side damping force generation valves to connect the respective members to the base ends of the inlay portions. In the damping force generation valve structure of the hydraulic shock absorber fixed between the insertion portion, the insertion portion is inserted between the damping force generation valve of the compression side or the extension side damping force generation valve and the insertion portion. A cylindrical movement guide member, and a radial movement restricting member for restricting radial movement of a plurality of leaf valves constituting the damping force generating valve, and a vertical movement member. It is characterized in that provided the vertical movement restricting member for restricting the.

  According to the present invention, the compression-side or extension-side damping force generating valve is inserted into the guide member so that the radial movement restriction member can be positioned in the radial direction, and the vertical movement restriction member can Therefore, for example, among the plurality of leaf valves constituting the damping force generating valve at the time of assembly as in the past, for example, it is possible to reliably prevent the occurrence of a problem that an arbitrary one is misaligned in the radial direction. .

  In addition, since either the expansion side or the pressure side damping force generating valve is inserted into the guide member in advance, subassemblies can be realized, so that not only the assembly to the spigot part is very good, but also the number of parts is reduced. It is easy to manage.

  Furthermore, by changing the number of leaf valves that are inserted into the guide member, a sub-assembled guide member with different damping force specifications can be created. It is very easy to deal with different things.

  Hereinafter, an embodiment in which the present invention is embodied in a damping force generation valve structure provided in a piston portion of a hydraulic shock absorber used in an automobile suspension device will be described with reference to the drawings.

  As shown in FIG. 1, this damping force generation valve structure is constructed by a compression side valve stopper 3, a spacer 4, a compression side damping force generation valve 5 comprising a plurality of leaf valves, a compression side and an extension side. The piston 6 having the ports 6a and 6b, the extension side damping force generating valve 7 composed of a plurality of leaf valves on the outer peripheral surface, and the guide member 11 in which the spacer 8 is inserted through the mounting hole formed in the center thereof. In addition to sequentially laminating, the nut 10 is screwed into the spigot 2 from above the guide member 11, and the spacer 8 is pressed at the tip thereof, so that the base end 2a of the spigot 2 and It is fixed by applying a compression load between them.

  More specifically, the compression side damping force generating valve 5 is configured by laminating two leaf valves 5a and 5b having the same diameter and forming a disk shape, and the expansion side ports of the leaf valves 5a and 5b. A valve-side opening 5c for guiding the hydraulic oil into the extension side port 6b is provided in a portion facing the 6b.

  The piston 6 is formed with a mounting hole 6c for inserting the spigot portion 2 in the center thereof, the pressure side port 6a is formed on the outer peripheral side, and the extension side port 6b is formed on the inner peripheral side. Yes.

  Further, an outer seat surface 12 is formed between the inner surface of the piston 6 and the compression side port a and the expansion side port 6b, and a mounting for placing the guide member 11 on the inner peripheral side of the expansion side port 6b. A placement portion 13 is formed.

  As shown in FIG. 2, the guide member 11 having the base end placed on the mounting portion 13 is formed in a cylindrical shape having an inner sheet surface 14 as a vertical regulating member having a hook shape at the base end. At the same time, the outer diameter D is formed to be substantially the same as the mounting hole diameter H of the leaf valves 7a, 7b, 7c, which will be described later, and the mounting hole diameter R of the spacer 8, thereby constituting a radial direction regulating member.

  The extension side damping force generating valve 7 is configured by stacking three leaf valves 7a, 7b, 7c having the same diameter and forming a disk shape, and is mounted substantially the same as the outer diameter D of the guide member 11. While being inserted into the guide member 11 through the mounting hole 7d formed in the hole diameter H, the inner diameter portions of the leaf valves 7a, 7b, 7c are placed on the inner seat surface 14.

  The spacer 8 is formed in a disk shape having a smaller diameter than the extension side damping force generating valve 7 and through a mounting hole 8a formed in a mounting hole diameter R substantially the same as the outer diameter D of the guide member 11. It is inserted into the lever guide member 11 and laminated on the leaf valves 7a, 7b, 7c.

  Accordingly, the leaf valves 7a, 7b, 7c and the spacer 8 inserted into the guide member 11 are restricted from moving in the radial direction by the outer peripheral surface of the guide member 11, and are also formed by the bowl-shaped inner seat surface 14. Since movement in the vertical direction is restricted, so-called sub-assembly is achieved.

  The nut 10 is formed in a cap shape into which the upper part of the guide member 11 can be inserted, and the nut 10 is screwed toward the piston 6 and its tip is pressed against the spacer 8 to extend the extension side. The damping force valve 7 is mounted on the outer seat surface 12 and the inner seat 14 and is fixed by applying a compressive load between the base end portion 2 a of the spigot portion 2.

  In order to assemble the damping force generation valve structure of the hydraulic shock absorber configured as described above, first, as shown in FIG. 3, a holding portion 15 is formed which is formed in substantially the same shape as the inlay portion 2 of the piston rod 1. The pressure side valve stopper 3, the spacer 4, the pressure side damping force generation valve 5, and the piston 6 are sequentially stacked on the needle 16, and then the extension side damping force generation valve 7 and the spacer 8 are inserted in advance. The piston assembly 17 is configured by stacking and temporarily assembling the guide members 11 shown in FIG.

  When the piston assembly 17 configured in this way is carried to the assembly process to the piston rod 1, the assembly operator grasps the piston assembly 17 with one hand and pulls it out of the needle ridge 16 so that the tip inlay portion of the piston rod 1 is removed. Then, the nut assembly 10 is screwed to fix the piston assembly 17 to the piston rod 1 as shown in FIG.

  At this time, only the so-called sub-assembly guide member 11 into which the expansion side damping force generation valve 7 and the spacer 8 are inserted in advance is placed on the inner surface of the piston 6. At the time of replacement, only the misalignment of the one member in the radial direction needs to be taken into consideration, and the assembly work is easier than in the prior art.

  Further, by inserting the expansion side damping force generating valve 7 and the spacer 8 into the guide member 11, the vertical seating can be performed on the inner seat surface 14 and the radial positioning can be performed on the outer peripheral surface. Thus, it is possible to reliably prevent the occurrence of a problem that any one of the leaf valves 7a, 7b, 7c constituting the expansion side damping force generation valve 7 and the spacer 8 at the time of assembly are misaligned in the radial direction.

  Further, since the extension side damping force generating valve 7 and the spacer 8 laminated on the inner surface of the piston 6 are inserted into the guide member 11 in advance, the subassembly can be realized. Not only is it very good, but the number of parts is reduced and management is easy.

  Furthermore, by changing the number of stacked leaf valves 7a, 7b, 7c inserted into the guide member 11, a sub-assembled guide member 11 with different damping force specifications can be formed. If so, it becomes very easy to cope with different damping force specifications.

  Further, the extension side damping force generating valve 7 and the spacer 8 inserted into the guide member 11 are brought into pressure contact with each other by screwing of the nut 10 during assembly, so that, for example, the extension side damping force generating valve 7 and Even if a gap or the like is generated between the members when the spacer 8 is inserted, an accurate contact state determined in advance by the pressure contact of the tip can be achieved.

  In addition, this invention is not limited to the said embodiment, For example, it can also be changed and embodied as follows.

  1) In the present embodiment, the present invention is embodied in the damping force generating valve structure in which the expansion side damping force generating valve 7 is fixed by the inner seat surface 14, but the present invention is not limited to this, and FIG. The extension side damping force generation valve 19 as shown in FIG. 5 may be embodied in a damping force generation valve structure that can move up and down against the elastic force of the coil spring 20 provided on the upper side.

  In this case, of the pair of spring guides arranged above and below the coil spring 20, the lower spring guide 21 is inserted into the guide member 11 so as to be movable up and down, and the upper spring guide 22 is inserted into the guide member. Since the guide member 11 is sub-assembled by being lightly press-fitted with respect to 11, it can be fixed to the spigot portion 2 by screwing the nut 10 through the spacer 23, as shown in the present embodiment. As a result, the assembly work is easy.

  2) As shown in FIG. 5, the height of the seat surface may be finely adjusted by interposing an annular adjusting member 34 between one end of the guide member 11 and the inner surface of the piston 6.

  3) In the present embodiment, the guide member 11 of the present invention is provided on the expansion side damping force generation valve 19 side. However, the present invention is not limited to this, and may be provided on the compression side damping force generation valve 5 side. Of course.

It is sectional drawing of the damping force generation | occurrence | production valve | bulb structure which shows the best form of this invention. In FIG. 1, it is sectional drawing which shows the state which inserted the expansion side damping force generation | occurrence | production valve | bulb in the guide member, and was made into subassembly. It is sectional drawing which shows the state which inserted the damping force generation | occurrence | production valve structure of FIG. 1 in the needle mountain, and formed the piston assembly. It is sectional drawing of the damping force generation valve | bulb structure which shows another example of this invention. It is sectional drawing of the damping force generation valve | bulb structure which shows another example of this invention. It is sectional drawing of the conventional damping force generation valve structure. It is sectional drawing which shows the state which inserted the damping force generation valve structure of FIG. 6 in the needle | hook and formed the piston assembly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piston rod 2 Inlay part 2a Base end part 5 Pressure side damping force generation valve 5a, 5b Leaf valve 6 Piston 6a Extension side port 6b Pressure side port 7 Extension side damping force generation valve 7a, 7b, 7c Leaf valve 7d Mounting hole 10 Nut 11 Guide member 14 Inner sheet surface (up / down movement restriction member)
19 Extension side damping force generating valve H Leaf valve mounting hole diameter D Guide member outer diameter

Claims (4)

Formed in the center of the piston rod inlay part is a compression side damping force generation valve consisting of multiple leaf valves, a piston with compression side and extension side ports, and an extension side damping force generation valve consisting of multiple leaf valves. Damping of a hydraulic shock absorber, in which the members are stacked sequentially through the mounting holes and the nuts are screwed from above the extension side damping force generating valve to fix the members between the base end of the spigot portion In the force generation valve structure, a cylindrical guide member inserted into the inlay portion is interposed between the damping force generation valve of either the compression side or extension side damping force generation valve and the inlay portion, and this A radial movement restricting member for restricting movement in the radial direction of a plurality of leaf valves constituting a damping force generating valve on the guide member, and an up / down direction movement restricting member for restricting movement in the up / down direction Damping force generating valve structure of a hydraulic shock absorber, characterized in that digit. 2. The hydraulic shock absorber according to claim 1, wherein a seat surface on which inner peripheral sides of a plurality of leaf valves constituting a stretch-side or compression-side damping force generation valve are provided at one end of the guide member is used as the vertical movement restricting member. Damping force generating valve structure of the vessel. The damping force generation of the hydraulic shock absorber according to claim 1, wherein the outer diameter of the guide member is formed to be substantially the same as the mounting hole diameter of a plurality of leaf valves constituting the damping force generating valve. Valve structure. 2. The guide member is formed in a cylindrical shape that is inserted into an inlay portion between an extension side damping force generating valve and an inlay portion laminated on an inner surface of a piston, and has one end in contact with the inner surface of the piston. 2. A damping force generating valve structure for a hydraulic shock absorber according to claim 2 or 3.

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