JP5530291B2 - Shock absorber - Google Patents

Description

  The present invention relates to a shock absorber.

  Various proposals have been made for shock absorbers so far. For example, Patent Documents 1 and 2 disclose a configuration of a conventional shock absorber that is interposed between a vehicle body and an axle of a vehicle to suppress vehicle vibration. Has been.

  As shown in FIG. 1 of Patent Document 1, the shock absorber described in Patent Document 1 is a cylinder that accommodates a working fluid, a rod that is removably inserted into the cylinder, and a cylinder that is held by the rod and is held in the cylinder. A piston that is slidably inserted into the cylinder, and a base member that is fitted to the bottom of the cylinder.

  Further, as shown in FIG. 5A, the shock absorber includes an outer cylinder 400 that covers the cylinder 100 and forms a reservoir chamber R between the cylinder 100 and the cylinder 100, and the outer cylinder 400. And a double cylinder type shock absorber constituting a double pipe.

The shock absorber includes a damping force generating means for attenuating the movement of the rod, that is, the expansion and contraction motion of the shock absorber when a vibration is input.

  In the cylinder 100, two working chambers are formed by a piston, and the damping force generating means is formed in a communication passage and a base member formed in the piston and communicating the two working chambers. Is provided in the middle of a communication path that communicates with the reservoir chamber R.

  And since the said damping force generation | occurrence | production means produces resistance when a working fluid passes each said communicating path and suppresses sliding of a piston, a buffer can suppress a vehicle body vibration.

  Further, the shock absorber is generally assembled by fixing the outer cylinder 400 and the cylinder 100 to a bottom member connected to the axle, and the cylinder 100 and the outer cylinder 400 are generally made of iron.

  Further, the shock absorber described in FIGS. 5 and 6 of Patent Document 2 has the same basic structure as the shock absorber described in Patent Document 1, and as shown in FIG. An anti-roll type in which an inner cylinder 800 is provided between the inner cylinder 800 and the inner cylinder 800, a cylindrical flow path L is formed between the inner cylinder 800 and the reservoir chamber R is formed between the inner cylinder 800 and the outer cylinder 400. It is a hydraulic shock absorber.

  The shock absorber forms a triple pipe by the cylinder 100, the inner cylinder 800, and the outer cylinder 400 each made of an iron material, and the cylinder 100, the inner cylinder 800, and the outer cylinder 400 are respectively fixed to the bottom member.

JP 2009-036258 A JP 2001-088529 A

  The conventional shock absorber is not particularly defective in terms of function, but the following improvements are desired.

  First, since the cylinder, the inner cylinder, and the outer cylinder are separately manufactured and assembled, the number of parts is large and the assembling work is complicated.

  Second, since the cylinder, inner cylinder and outer cylinder are made of iron, the weight of the shock absorber is increased, and it is common to coat the outer cylinder in order to improve rust prevention performance. Is big.

  Third, the cylinder, the inner cylinder, and the outer cylinder are cylinders, and spaces are formed between the cylinders. Therefore, when the cylinder, the inner cylinder, and the outer cylinder are formed of synthetic resin, strength is ensured. The cylinder, the inner cylinder, and the outer cylinder need to be formed thick, which leads to an increase in the diameter of the shock absorber.

  Then, the objective of this invention is providing the buffer which can solve the said malfunction.

Means for solving the above-described problems include a cylindrical tubular body that contains a working fluid therein, and is slidably inserted into the periphery of the tubular body to partition two working chambers inside the tubular body. a piston, a rod for holding the piston in the damper and a damping force generating means for generating a predetermined damping force when the piston slides, the cylindrical body, the thick portion a number of A shock absorber characterized in that it is made of a synthetic resin cylinder that is formed in a porous shape having holes and has no holes on the outer peripheral surface, and a working fluid is accommodated in each hole of the thick portion.

According to the present invention, instead of the conventional cylinder and the outer cylinder, a cylindrical body is formed, and the cylindrical body is formed in a porous shape , and has a hole so that the working fluid is accommodated in each hole of the thick portion. By using this thick portion as a reservoir chamber or a flow path, the number of components is reduced to facilitate the assembly work of the shock absorber, and the outer peripheral surface of the cylindrical body has no hole. Thus, the working fluid can be prevented from permeating to the outside .

  In addition, it is possible to reduce the weight of the shock absorber by forming the cylindrical body from a synthetic resin, and the synthetic resin material does not need to be coated with a rust-proof coating on the outer cylinder as in the prior art, and is environmentally friendly. Can be reduced.

  In addition, by forming the thick portion of the cylindrical body in a porous manner, it becomes possible to ensure rigidity, and even when formed with a synthetic resin, conventional buffers that respectively form a cylinder, an inner cylinder, and an outer cylinder. It is possible to form the shock absorber with a small diameter compared to the container.

It is a longitudinal cross-sectional principle figure of the buffer which concerns on one embodiment of this invention. (A) It is a perspective view which shows a part of cylindrical body in the buffer which concerns on one embodiment of this invention. (B) It is a perspective view which expands and shows a part of thick part in the cylindrical body of (a). It is a fragmentary perspective view which shows the modification of the cylindrical body in the buffer which concerns on one embodiment of this invention. It is a longitudinal cross-sectional principle figure of the buffer which concerns on other embodiment of this invention. (A) It is a perspective view which shows a part of double pipe structure which consists of the cylinder and outer cylinder in the conventional shock absorber. (B) It is a perspective view which shows a part of triple tube structure which consists of a cylinder, an inner cylinder, and an outer cylinder in the conventional shock absorber.

  A shock absorber according to an embodiment of the present invention will be described below with reference to the drawings. The same reference numerals given throughout the several drawings indicate the same or corresponding parts.

  FIG. 1 shows a principle diagram of the shock absorber according to this embodiment. The shock absorber according to the present embodiment includes a cylindrical tubular body 1 that contains a working fluid therein, and is slidably inserted into the inner periphery of the tubular body 1 so as to have two inside the tubular body 1. A piston 2 that partitions the working chambers A and B, a rod 3 that holds the piston 2, and damping force generation means (V1, V2) that generate a predetermined damping force when the piston 2 slides are provided.

  As shown in FIG. 2B, the cylindrical body 1 is made of a synthetic resin in which the thick portion 1b is formed porous, and the thick portion 1b also contains the working fluid.

  Below, each component of the said shock absorber is demonstrated in detail.

  The shock absorber is interposed between the vehicle body and the axle of the vehicle and suppresses vehicle body vibration.

  As shown in FIG. 1, the rod 3 that appears and disappears in the cylindrical body 1 is slidably supported on the inner periphery of an annular rod guide 10 provided at the head portion (upper end in the figure) of the cylindrical body 1. Thus, the upper end in the figure is fixed to the vehicle body via a vehicle body side mounting member (not shown).

  Further, a bottom member 11 for sealing the lower opening of the cylindrical body 1 in the figure is provided at the bottom portion (lower end in the figure) of the cylindrical body 1, and this bottom member 11 is an axle side mounting member. It is fixed to the axle via (not shown).

  By providing the above configuration, the shock absorber is interposed between the vehicle body and the axle, and expands and contracts when the rod 3 protrudes and retracts into the cylindrical body 1 by the input of road surface vibration.

  Further, an upper portion of the rod guide 10 in the figure is provided with an annular cap member 12, and this cap member 12 is provided with an annular seal member 13 slidably contacting the outer periphery of the rod 3 on the inner periphery, and the cylinder The upper end opening in the figure of the state body 1 is sealed to prevent the working fluid housed in the shock absorber together with the bottom member 11 from leaking to the outside.

The cylindrical body 1 will be described in detail later, is formed on the porous thick portion 1b has a number of holes corresponding to the hatched portion in FIGS. 1 and 2 in the tube 1, the thick portion A reservoir chamber R is formed by accommodating a working fluid in each hole 1b.

  Further, in the reservoir chamber R, an air chamber G that is set to a predetermined internal pressure is formed upward via the liquid level O of the working fluid.

  The cylindrical body 1 has a rod guide 10 fitted on the inner periphery of the upper end opening in FIG. 1 and a base member 14 fitted on the inner periphery of the lower end opening in FIG.

  And the inside of the cylindrical body formed inside the cylindrical body 1 is divided into two working chambers A and B by a piston 2 that is slidably inserted into the inner periphery of the cylindrical body 1, and the rod 3 side The extension side working chamber A is formed on the piston 2 side, and the compression side working chamber B is formed on the piston 2 side.

  The piston 2 has expansion side and pressure side communication passages L1 and L2 communicating with the two working chambers A and B, and is held at the tip of the rod 3 connected to the vehicle body side. And is slid in the cylindrical body 1 under road surface vibration.

  An extension side leaf valve V1 is provided in the middle of the extension side communication passage L1 so that the extension side leaf valve V1 can be opened and closed. The extension side leaf valve V1 has a working fluid that passes through the extension side communication passage L1. While only allowing movement from A to the pressure side working chamber B, resistance is generated during the movement to generate an expansion-side damping force.

  On the other hand, in the middle of the pressure side communication passage L2, a check valve C1 is provided so as to be openable and closable. The check valve C1 is configured such that the working fluid passing through the pressure side communication passage L2 is expanded from the pressure side working chamber B. Only movement to the room A is permitted, and the movement is not hindered.

  Further, the base member 14 fitted to the bottom portion of the cylindrical body 1 has expansion side and pressure side communication passages L3 and L4 communicating with the compression side working chamber B and the reservoir chamber R, and is supported by the bottom member 11. Being done.

  A check valve C2 is provided in the middle of the expansion side communication path L3 of the base member 14 so that the working fluid passing through the expansion side communication path L3 is stored in the reservoir chamber R. Only the movement to the compression side working chamber B is allowed, and the movement is not hindered.

  On the other hand, in the middle of the pressure side communication passage L4 in the base member 14, a pressure side leaf valve V2 is provided so as to be openable and closable, and the pressure side leaf valve V2 is operated by the working fluid passing through the pressure side communication passage L4. Only the movement from the chamber B to the reservoir chamber R is allowed, and resistance is generated during the movement to generate a compression-side damping force.

  By providing the above-described configuration, the expansion side leaf valve V1 attached to the piston 2 and the compression side leaf valve V2 attached to the base member 14 constitute a damping force generating means. It becomes possible for the working fluid to pass through the leaf valves V1 and V2 to generate a predetermined damping force.

  In addition, the shock absorber can supplement the reservoir chamber R with the working fluid that is insufficient and insufficient for the rod 3 to protrude into and out of the cylindrical body 1 through the base member 14.

  Specifically, when the shock absorber extends, the extension side working chamber A is pressurized, the working fluid passes through the extension side leaf valve V1 and moves to the compression side action chamber B to generate the extension side damping force, and the rod 3 The working fluid that is deficient in the exiting cylindrical body 1 flows from the reservoir chamber R into the pressure-side working chamber B via the check valve C2 of the base member 14.

  On the other hand, when the shock absorber contracts, the pressure side working chamber B is pressurized and the working fluid moves from the pressure side working chamber B to the extending side working chamber A via the check valve C1 of the piston 2, and the rod 3 is immersed. The surplus working fluid in the body 1 passes through the pressure-side leaf valve V2 and moves to the reservoir chamber R to generate a pressure-side damping force.

  That is, the shock absorber according to the present embodiment is a single-tube shock absorber in terms of configuration by including the cylindrical body 1, but in principle it is a double tube similar to the shock absorber disclosed in Patent Document 1. This is a double-tube shock absorber having a structure.

  The configuration of the damping force generation means V1 and V2 is not limited to the leaf valve, and other known configurations such as an orifice can be selected.

  The cylindrical body 1 is formed by a method such as filling a gas into a foamable synthetic resin or a dissolved synthetic resin material, and the thick portion 1b is formed to be porous.

  The internal structure of the thick portion 1b can be selected as appropriate. For example, it may have a honeycomb structure as shown in FIG. 2B. In this case, the rigidity of the cylindrical body 1 Can be ensured.

  In addition, the holes H formed in the thick part 1b are formed by communicating adjacent holes H so that the working fluid can freely move in the thick part 1b.

  Moreover, the inner peripheral surface 1a and the outer peripheral surface 1c of the cylindrical body 1 do not have the hole H, and the working fluid does not pass through the inner peripheral surface 1a and the outer peripheral surface 1c.

  The configuration of the inner peripheral surface 1a and the outer peripheral surface 1c of the cylindrical body 1 can be formed, for example, by casting the cylindrical body 1, and according to the method, the mold and the synthetic resin can be formed. It is possible to prevent the hole H from being generated on the contact surface with the material.

  By providing the above configuration, the inner peripheral surface 1a of the cylindrical body 1 corresponds to the inner peripheral surface 100a of the conventional cylinder 100, and the outer peripheral surface 1c of the cylindrical body 1 corresponds to the outer peripheral surface 400a of the conventional outer cylinder 400. The body 1 can play the role of the conventional cylinder 100, outer cylinder 400, and reservoir chamber R.

  Further, since the shock absorber includes the cylindrical body 1 in place of the conventional cylinder 100 and the outer cylinder 400 and the reservoir chamber R is formed in the thick portion 1b of the cylindrical body 1, the cylinder 100 and the outer cylinder 400 are provided. As a result, it is possible to reduce the number of parts and facilitate the assembly work of the shock absorber.

  Further, by forming the cylindrical body 1 from a synthetic resin, it is possible to reduce the weight as compared with a conventional shock absorber in which the cylinder 100 and the outer cylinder 400 are formed of a metal such as iron.

  In addition, the synthetic resin does not need to be coated for rust prevention on the outer cylinder 400 as in the prior art, and the environmental load can be reduced.

  Furthermore, by making the thick part 1b of the cylindrical body 1 porous, it becomes possible to ensure the rigidity of the cylindrical body 1, and the conventional case in which each of the cylinder 100 and the outer cylinder 400 is formed of a synthetic resin. Compared to the shock absorber, the shock absorber can be formed with a small diameter.

  In order to ensure the slidability of the piston 2, as shown in FIG. 3, a cylindrical member T made of iron or aluminum is provided by insert molding on the inner periphery of the cylindrical body 1, and the piston 2 is formed by the cylindrical member T. The slidability may be guaranteed.

  In this case, the cylindrical member T may be provided only on the piston sliding surface, or may be provided on the entire inner periphery of the cylindrical body 1.

  Similarly, since the cylindrical member T is reinforced by the thick portion 1b of the cylindrical body 1, it can be formed thinner than the conventional cylinder 100, which hinders the weight reduction of the shock absorber. There is nothing.

  The material of the cylindrical member T is not limited to the above, and other materials such as other metals or synthetic resins can be appropriately selected as long as the slidability of the piston 2 can be ensured.

  Next, a shock absorber according to another embodiment of the present invention will be described with reference to FIG. About the structure corresponding to one Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The shock absorber according to the present embodiment is slidably inserted into a cylindrical tubular body 8 that contains a working fluid therein and the inner periphery of the tubular body 8, as in the above-described embodiment. A piston 2 that divides two working chambers A and B inside the cylindrical body 8, a rod 3 that holds the piston 2, and a damping force generating means that generates a predetermined damping force when the piston 2 slides ( V3).

  The cylindrical body 8 is made of a synthetic resin in which the thick portions 8b and 8c are formed porous. The thick portions 8b and 8c contain the working fluid, and the thick portions 8b and 8c 8c is divided into two cylindrical chambers (8b, 8c) by the partition cylinder 8T, and a reservoir chamber R is formed on the outer side (8c) and a flow path L is formed on the inner side (8b).

  The shock absorber is interposed between the vehicle body and the axle in the vehicle, as in the above-described embodiment, and suppresses vehicle body vibration.

  In the present embodiment, the shock absorber includes a partition cylinder 8T between the thick portions 8b and 8c, forms a flow path L inside the partition cylinder 8T, and forms a reservoir chamber R outside the partition cylinder 8T. A cylindrical body 8 is provided.

The flow path L communicates with the extension side working chamber A through a communicating passage L5 formed in the rod guide 10 further communicates with the reservoir chamber R through the communication passage L6 which is formed in the base member 14.

  In the middle of the communication path L6 formed in the base member 14, only the movement of the working fluid from the flow path L to the reservoir chamber R is allowed, and a leaf valve serving as a damping force generating means that generates resistance during the movement. V3 is provided.

  The piston 2 that is slidably inserted into the cylindrical body formed inside the cylindrical body 8 communicates with the expansion side working chamber A and the pressure side working chamber B through the piston 2. Is formed.

  A check valve C3 that allows only the movement of the working fluid from the pressure side working chamber B to the extension side working chamber A and does not hinder the movement is provided in the middle of the communication path L7.

  Further, the base member 14 is formed with a communication passage L8 that communicates the pressure side working chamber B and the reservoir chamber R, and the operation from the reservoir chamber R to the pressure side working chamber B is in the middle of the communication passage L8. A check valve C4 is provided which allows only the movement of the fluid and does not hinder the movement.

  By providing the above-described configuration, when the shock absorber according to the present embodiment expands, the working fluid in the extension-side working chamber A that is pressurized passes through the communication path L5 and the flow path L (thick part 8b). In order to move into the reservoir chamber R, a predetermined damping force is generated through the leaf valve V3.

  At this time, the working fluid that is deficient in the cylinder 1 for the withdrawal of the rod 3 flows from the reservoir chamber R (thick portion 8c) into the pressure side working chamber B via the check valve C4 of the base member 14.

  Further, when the shock absorber according to the present embodiment contracts, the working fluid in the pressure side working chamber B to be pressurized moves into the extension side working chamber A by opening the check valve C3 of the piston 2.

  Then, the working fluid that is the surplus volume of the rod 3 that immerses in the cylindrical body 8 moves from the extension side working chamber A into the reservoir chamber R via the communication path L5 and the flow path L (thick part 8b). At this time, a predetermined damping force is generated through the leaf valve V3.

  That is, the shock absorber according to the present embodiment is a single-tube shock absorber in terms of configuration by including the cylindrical body 8, but is in principle a double-tube shock absorber having a triple tube structure. .

  The configuration of the damping force generating means V3 is not limited to the leaf valve, and other known configurations such as an orifice can be adopted.

  The thick portions 8b and 8c of the cylindrical body 8 are filled with a gas in a foamable synthetic resin or a dissolved synthetic resin material, similarly to the thick portion 1b of the cylindrical body 1 in the one embodiment. And the like.

  About the structure of the said thick parts 8b and 8c, it is the same as that of one Embodiment, for example, has the honeycomb structure shown in FIG.2 (b).

  Moreover, the partition cylinder 8T that divides the thick portions 8b and 8c inside and outside is made of synthetic resin or metal, and is provided on the cylindrical body 8 by insert molding.

  The method for forming the partition cylinder can be selected as appropriate. Although not shown, a cylindrical body having a porous thick portion is cast and then inserted into the outer periphery. A thick wall portion having a high quality may be formed, and a boundary between the inserted cylindrical body and the thick wall portion attached later may be a partition tube.

  By providing the above configuration, the inner peripheral surface 8a of the cylindrical body 8 is an inner peripheral surface of a conventional cylinder, the partition tube 8T is a conventional inner cylinder, and the outer peripheral surface 8d of the cylindrical body 8 is a conventional outer cylinder. Corresponding to the outer peripheral surface, the cylindrical body 8 can serve as a conventional cylinder, inner cylinder, outer cylinder, reservoir chamber, and flow path.

  Therefore, it is not necessary to assemble the cylinder 100, the inner cylinder 800, and the outer cylinder 400 as in the prior art, and it is possible to reduce the number of components and facilitate the assembly work of the shock absorber.

  Further, by forming the cylindrical body 8 from a synthetic resin, the cylinder 100, the inner cylinder 800, and the outer cylinder 400 can be reduced in weight compared to a conventional shock absorber formed of a metal such as iron. .

  Further, the synthetic resin does not need to be coated for rust prevention on the outer cylinder 400, and can reduce the environmental load.

  Furthermore, by providing the porous thick portions 8b and 8c, it becomes possible to ensure rigidity, and compared with the conventional shock absorber when the cylinder 100, the inner cylinder 800, and the outer cylinder 400 are each formed of a synthetic resin. Thus, the shock absorber can be formed with a small diameter.

  Although not shown, the cylindrical member T may be insert-molded in the same manner as in the above embodiment, and the effect of this is the same as that in the first embodiment.

  Similarly, although not shown, a uniflow structure having a triple-pipe structure in principle may be configured by using the cylindrical body 1 in one embodiment and the conventional outer cylinder 400 or the conventional cylinder 100 in combination. Of course.

  Specifically, when the conventional outer cylinder 400 and the cylindrical body 1 are used in combination, the cylindrical body 1 plays the role of the conventional cylinder 100 and the flow path L, and the cylindrical body 1 and the conventional outer cylinder 1 are used. A reservoir chamber R may be formed between the cylinder 400.

  On the other hand, when the conventional cylinder 100 and the cylindrical body 1 are used in combination, the cylindrical body 1 serves as the conventional outer cylinder 400 and the reservoir R, and the cylindrical body 1 and the conventional cylinder 100 What is necessary is just to form the flow path L between these.

  Of course, the cylindrical bodies 1 and 8 according to the above-described embodiment can be used in the anti-roll hydraulic shock absorber disclosed in Patent Document 2.

  While the preferred embodiment of the present invention has been described above, it should be understood that modifications, variations and changes may be made without departing from the scope of the claims.

  For example, in the above-described embodiment, the shock absorber is interposed between the vehicle body and the axle of the vehicle. However, a multi-tube shock absorber having the above-described configuration of the present invention may be used in addition to the vehicle.

  Further, the structure of the valve structure and the communication path for generating the damping force in the shock absorber is not limited to the above, and any other shock absorber having a double pipe or triple pipe structure can be used for the cylindrical bodies 1 and 8 of the present invention. Of course, may be used.

  Moreover, in the said embodiment, although the buffer which has a double tube and a triple tube structure was demonstrated, you may utilize this invention for the buffer which has a double cylinder structure more than quadruple.

A Stretching side working chamber B Pressure side working chamber C1, C2, C3, C4 Check valves V1, V2, V3 Leaf valve (damping force generating means)
H hole L flow path L1, L2, L3, L4, L5, L6, L7, L8 communication path R reservoir chamber 1, 8 cylindrical body 1a, 8a inner peripheral surface 1b, 8b, 8c thick part 1c, 8d outer peripheral surface 8T Bulkhead cylinder 2 Piston 3 Rod

Claims (6)

A cylindrical tubular body containing a working fluid therein;
A piston that is slidably inserted into the periphery of the cylindrical body and defines two working chambers inside the cylindrical body;
A rod that holds this piston,
In shock absorber and a damping force generating means said piston to generate a predetermined damping force at the time of sliding,
The cylindrical body is formed of a synthetic resin cylindrical body that is formed into a porous body having a large number of holes and has no holes on the outer peripheral surface ,
A shock absorber characterized in that a working fluid is accommodated in each hole of the thick portion.
The shock absorber according to claim 1, wherein a cylindrical member is provided by insert molding on a sliding surface of the piston in the inner periphery of the cylindrical body.
The shock absorber according to claim 1 or 2, wherein the thick portion has a honeycomb structure.
The shock absorber according to any one of claims 1 to 3, wherein the thick portion is partitioned into two cylindrical chambers by a partition cylinder.
  The shock absorber according to any one of claims 1 to 4, wherein each hole formed in the thick portion is formed by communicating adjacent holes.
The shock absorber according to any one of claims 1 to 5, wherein the cylindrical body is formed by filling a gas into a foamable synthetic resin or a dissolved synthetic resin.

Images