JP2023018353A - Damping force generator - Google Patents

Abstract

To provide a technology which can prevent a housing and a fitting member from moving relative to each other in an axial direction without increasing the number of components.SOLUTION: A damping force generator includes: an external housing 120 having a cylindrical shape and provided with a first engagement part 136 having a shape recessed or protruding from an inner peripheral surface in a second radial direction intersecting with a second axial direction; a cover part 95 which is fitted in the external housing 120 and provided with a second engagement part 956 having a shape recessed or protruding from an outer peripheral surface in the second radial direction; and a clip 99 which is provided so as to span a gap between the first engagement part 136 and the second engagement part 956. The cover part 95 has an application part 150 which is integrally provided with the cover part 95 and applies a force in the second axis direction so as to be separated from the external housing 120.SELECTED DRAWING: Figure 2

Description

The present invention relates to a damping force generator.

For example, the damping force adjustable shock absorber described in Patent Document 1 is configured as follows. That is, the damping force adjustable shock absorber has a valve case protruding from the side of the cylinder. A damping force adjustment mechanism is accommodated in the valve case. The damping force adjustment mechanism variably adjusts the generated damping force by adjusting the valve opening pressure of the damping valve with a solenoid applied as a damping force variable actuator. The solenoid includes a coil case and a case member. An annular concave portion is formed on the outer peripheral surface of the case member. The valve case and the case member are coupled (joined) by a plurality of crimped portions formed at regular intervals along the annular recess. The coil case (on the shaft side) and the case member (on the hole side) are connected and integrated by a substantially C-shaped retaining ring. The retaining ring is mounted between an annular groove formed in the outer peripheral surface of the coil case and an annular groove formed in the inner peripheral surface of the case member, and is used to prevent the coil case and the case member from moving in the axial direction. prevent movement.

Japanese Patent No. 6732040

A substantially C-shaped clip is composed of a cylindrical housing, such as the case member described in Patent Document 1, and a fitting member, such as the coil case described in Patent Document 1, which is fitted inside the housing. When the housing and the fitting member are connected and integrated by a (retaining ring), means for preventing relative axial movement between the housing and the fitting member is required. That is, since the axial size of the annular groove in which the clip is mounted is larger than the axial size of the clip, means for preventing relative movement in the axial direction by the size difference is required. . However, it is undesirable to increase the number of parts to take this measure.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a damping force generator capable of preventing relative axial movement between a housing and a fitting member without increasing the number of parts.

The present invention, which has been completed for this purpose, provides a cylindrical housing having a first engaging portion which is recessed or protrudes from the inner peripheral surface in a direction intersecting the center line direction; a fitting member that is fitted inside a housing and has a second engaging portion that is recessed or protrudes from an outer peripheral surface in a direction intersecting the center line direction; and a clip provided to straddle two engaging portions, wherein one of the housing and the fitting member is provided integrally with the one member and separated from the other member. is a damping force generator having an applying portion for applying force in the direction of the center line.

According to the present invention, relative axial movement between the housing and the fitting member can be prevented without increasing the number of parts.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of schematic structure of the hydraulic shock absorber which concerns on 1st Embodiment. 4 is a cross-sectional view of the outer damping part of the first embodiment; FIG. FIG. 4 is a perspective view and a partial cross-sectional view of the outer damping portion of the first embodiment; FIG. 4 is a perspective view of an orifice plate and pilot valve; It is the figure which looked at the orifice plate and the pilot valve from the 2nd shaft outside. FIG. 4 is an operation explanatory diagram of the hydraulic shock absorber of the first embodiment; FIG. 4 is an operation explanatory diagram of the hydraulic shock absorber of the first embodiment; FIG. 4 is an explanatory diagram of oil flow in the outer damping portion of the first embodiment; FIG. 4 is an explanatory diagram of oil flow in the outer damping portion of the first embodiment; FIG. 10 is a diagram showing an example of a schematic configuration of an imparting section included in an outer damping section according to a second embodiment; FIG. 11 is a diagram showing an example of a schematic configuration of an imparting section included in an outer damping section according to a third embodiment; FIG. 11 is a diagram showing an example of a schematic configuration of a imparting member according to a third embodiment; FIG. FIG. 11 is a diagram showing an example of a schematic configuration of an imparting section included in an outer damping section according to a fourth embodiment; FIG. 11 is a diagram showing an example of a schematic configuration of a imparting member according to a fourth embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
<First embodiment>
[Configuration and Function of Hydraulic Shock Absorber 1]
FIG. 1 is a diagram showing an example of a schematic configuration of a hydraulic shock absorber 1 according to the first embodiment.
As shown in FIG. 1 , the hydraulic damping device 1 includes a cylinder portion 10 that stores oil, a rod 20 that protrudes from the cylinder portion 10 on the other side and is slidably inserted into the cylinder portion 10 on the other side, Prepare. The hydraulic shock absorber 1 also includes a piston portion 30 provided at one end of the rod 20 and a bottom portion 40 provided at one end of the cylinder portion 10 . Further, the hydraulic shock absorber 1 includes an outer damping portion 100 provided outside the cylinder portion 10 to generate a damping force.

In the following description, the longitudinal direction of the cylinder portion 10 shown in FIG. 1 is called "axial direction". Further, the lower side of the cylinder portion 10 in the axial direction is referred to as "one side", and the upper side of the cylinder portion 10 is referred to as the "other side".
Further, the lateral direction of the cylinder portion 10 shown in FIG. 1 is referred to as "radial direction". In the radial direction, the central axis side is referred to as "radial inner side", and the side away from the central axis is referred to as "radial outer side".

[Structure and Function of Cylinder Part 10]
The cylinder portion 10 includes a cylinder 11 containing oil, an outer cylindrical body 12 provided radially outward of the cylinder 11, and a damper disposed radially outward of the cylinder 11 and further radially outward of the outer cylindrical body 12. A case 13 is provided.

The cylinder 11 is formed in a cylindrical shape and has a cylinder opening 11H on the other side.
The outer cylindrical body 12 is formed in a cylindrical shape. The outer cylindrical body 12 forms a communication path L between itself and the cylinder 11 . Further, the outer cylinder 12 has an outer cylinder body opening 12H and an outer connecting part 12J at positions facing the outer damping part 100 . The outer connection portion 12</b>J has an oil flow path, protrudes radially outward, and forms a connection point with the outer damping portion 100 .

The damper case 13 is formed in a cylindrical shape. The damper case 13 and the outer cylindrical body 12 form a reservoir chamber R in which oil is accumulated. The reservoir chamber R absorbs oil in the cylinder 11 or supplies oil to the cylinder 11 as the rod 20 moves relative to the cylinder 11 . Also, the reservoir chamber R stores the oil that has flowed out of the outer damping portion 100 . Also, the damper case 13 has a case opening 13H at a position facing the outer damping portion 100 .

[Structure and Function of Rod 20]
The rod 20 is a rod-shaped member elongated in the axial direction. Rod 20 connects to piston portion 30 on one side. Also, the rod 20 is connected to, for example, the vehicle body via a connecting member or the like (not shown) on the other side. The rod 20 may be hollow with a hollow inside, or solid without a hollow inside.

[Structure and Function of Piston Part 30]
The piston portion 30 is provided between a piston body 31 having a plurality of piston oil passage ports 311, a piston valve 32 that opens and closes the other side of the piston oil passage ports 311, and one end portion of the piston valve 32 and the rod 20. and a spring 33 . The piston portion 30 divides the oil in the cylinder 11 into a first oil chamber Y1 and a second oil chamber Y2.

[Structure and Function of Bottom Part 40]
The bottom portion 40 has a valve seat 41, a check valve portion 43 provided on the other side of the valve seat 41, and a fixing member 44 provided in the axial direction. The bottom portion 40 separates the first oil chamber Y1 and the reservoir chamber R from each other.

[Structure and Function of Outer Damping Section 100]
FIG. 2 is a cross-sectional view of the outer damping section 100 of the first embodiment.
FIG. 3 is a perspective view and a partial cross-sectional view of the outer damping section 100 of the first embodiment.
4 is a perspective view of orifice plate 85 and pilot valve 80. FIG.
FIG. 5 is a view of the orifice plate 85 and the pilot valve 80 viewed from the outside of the second shaft.

In the following description, the longitudinal direction of the outer damping section 100 shown in FIG. 2 (that is, the crossing direction (for example, substantially orthogonal direction) crossing the axial direction of the cylinder section 10 (see FIG. 1)) is referred to as the "second axial direction ”. In addition, the left side of the outer damping portion 100 in the direction of the second axis is referred to as "second axis inner side", and the right side of the outer damping portion 100 is referred to as "second axis outer side".
Also, the vertical direction of the outer damping portion 100 shown in FIG. 2 (that is, the direction crossing the second axial direction) is referred to as the "second radial direction". In the second radial direction, the central axis side along the second axis is referred to as "second radial inner side", and the side away from the central axis along the second axis is referred to as "second radial outer side". called.

As shown in FIG. 2, the outer damping portion 100 (an example of a damping force generating device) includes a main valve portion 50 that controls the flow of oil, a first housing 60 that houses at least the main valve portion 50, a second shaft a second housing 70 provided on the opposite side of the first housing 60 in direction. Further, the outer damping section 100 includes a shim 69 provided between the first housing 60 and the second housing 70 , an orifice plate 85 provided within the first housing 60 , and a pilot valve 80 . Furthermore, the outer damping section 100 includes a first housing 60, a second housing 70, a shim 69, an orifice plate 85, a support member 89, and an adjustment section 90 for adjusting the oil pressure in a back pressure chamber 100P, which will be described later. Prepare. The outer damping portion 100 includes a connection flow path portion 110 that forms a flow path for oil from the communication path L to the main valve portion 50, and an external housing 120 that accommodates various components that make up the outer damping portion 100. And prepare.

(Main valve portion 50)
The main valve section 50 has a main valve 51 that mainly generates a damping force in the outer damping section 100 and a leaf spring 53 that supports the main valve 51 and is elastically deformable. The leaf spring 53 is supported by the first housing 60 and the second housing 70 at the second radially outer outer edge.

The main valve 51 is a member formed in an annular shape. The main valve 51 has an orifice portion 52F provided on the inner side in the second radial direction, and a pressure receiving portion 52R that receives the pressure of oil flowing into the main flow path 71 provided on the inner side of the second shaft. The main valve 51 has an annular surface facing the outside of the second axis, and has a spring receiving portion 52S that supports the inside of the second axis of the plate spring 53 . Further, the main valve 51 includes a first facing portion 521 provided so as to annularly protrude toward the inside of the second axis on the outside of the pressure receiving portion 52R in the second radial direction, and a second radial direction of the first facing portion 521. and a second opposing portion 522 that is provided so as to annularly protrude toward the inner side of the second axis on the outer side in the direction.

The channel cross-sectional area of the orifice portion 52F is formed to be sufficiently smaller than that of the main channel 71, for example. Even when the main valve 51 is in contact with a first valve seat portion 72 or a second valve seat portion 73 to be described later and the main flow path 71 is closed, the orifice portion 52F allows the flow from the main flow path 71 to the back pressure chamber 100P. Allow oil flow.
The first facing portion 521 faces a first valve seat portion 72 (described later) of the second housing 70 . The second facing portion 522 faces a second valve seat portion 73 (described later) of the second housing 70 . The first opposing portion 521 and the second opposing portion 522 open and close the first valve seat portion 72 and the second valve seat portion 73, respectively, thereby controlling the flow rate of the oil flowing through the main flow passage 71, thereby generate pressure. This causes the main valve 51 to generate a damping force of the hydraulic shock absorber 1 .

(First housing 60)
As shown in FIG. 2 , the first housing 60 is provided mainly outside the second shaft with respect to the main valve 51 . The first housing 60 can accommodate components such as the main valve 51 therein, and is provided in a tubular shape.
The first housing 60 includes an opening 61 provided on the outer side of the second shaft, a housing portion 63 housing an adjustment valve 91 (described later) of the adjustment portion 90, a holding portion 65 holding the orifice plate 85, and the second housing 70. and a facing portion 67 that faces the .

The opening 61 has a larger inner diameter than a small-diameter portion 91A of an adjustment valve 91 of the adjustment portion 90, which will be described later. The opening 61 forms a gap between the opening 61 and a small-diameter portion 91A, which will be described later, through which oil can flow.
The accommodation portion 63 accommodates an adjustment valve 91 and a compression coil spring 97 of the adjustment portion 90 , which will be described later. Further, the accommodating portion 63 forms an inflow chamber 631 into which oil flowing through the inner pilot flow path 87 and the outer pilot flow path 88 of the orifice plate 85 flows. Further, the accommodating portion 63 has an outflow passage 632 that allows the oil that has flowed into the inflow chamber 631 to flow out from the gap between the opening portion 61 and the adjustment valve 91 to the later-described in-housing passage 124 .

The holding portion 65 holds the orifice plate 85 . Further, the holding portion 65 forms part of a back pressure chamber 100P that applies back pressure to the main valve 51 toward a first valve seat portion 72 and a second valve seat portion 73, which will be described later. The back pressure chamber 100</b>P is a chamber into which oil flows from the orifice portion 52</b>F of the main valve 51 . Also, the oil in the back pressure chamber 100P can flow out through the inner pilot flow path 87 and the outer pilot flow path 88 of the orifice plate 85 . The back pressure chamber 100P applies back pressure to the main valve 51 according to the pressure of the oil inside.

The facing portion 67 includes a first connection portion 671 connected to the second housing 70, a first shim contact portion 672 contacting the surface of the shim 69 facing the second axis outside, and a main valve 51 facing the second axis outside. and a first valve contact portion 673 that contacts the surface.
The first connecting portion 671 holds and fixes the second housing 70 so that the second housing 70 does not move relative to the first housing 60 in the second axial direction. For example, the fixing method can be screw fastening or press fitting.

(Second housing 70)
The second housing 70 is provided mainly inside the second shaft with respect to the main valve 51 . The second housing 70 can accommodate components such as the main valve 51 together with the first housing 60 .
The second housing 70 includes a main flow passage 71 through which oil flows, and a first valve seat portion 72 provided so as to annularly protrude toward the outside of the second shaft at the end portion of the main flow passage 71 outside the second shaft. and a second valve seat portion 73 provided so as to annularly protrude toward the outside of the second axis from the second radial direction outside of the first valve seat portion 72 . The second housing 70 has an annular surface facing the outside of the second axis, and includes a second shim contact portion 74 that contacts the surface of the shim 69 facing the inside of the second axis, and an annular surface facing the outside of the second axis. and a second valve contact portion 75 that contacts the surface of the main valve 51 that faces the inside of the second axis. Further, the second housing 70 includes a second connection portion 76 connected to the first housing 60 , a groove portion 77 facing the outer edge portion of the surface of the main valve 51 facing the inside of the second axis, and a second portion of the main flow passage 71 . and an outer flow path 79 provided radially outward.

The main flow path 71 is formed inside the second housing 70 in the second radial direction along the second axial direction. The main flow path 71 communicates with an inner flow path 111 of the connecting flow path portion 110, which will be described later, on the inner side of the second axis. Further, the main flow path 71 faces the surface of the main valve 51 facing the inside of the second axis on the outside of the second axis.
The protrusion height of the second valve seat portion 73 is substantially equal to that of the first valve seat portion 72 . Between the first valve seat portion 72, the second valve seat portion 73, the first opposing portion 521, and the second opposing portion 522, there is an annular space 78 that is recessed toward the inside of the second shaft. It is formed.
Further, the first valve seat portion 72 has a plurality of groove portions 72T formed along the second radial direction. The oil passage cross-sectional area of each groove portion 72T is formed to be relatively small. That is, the groove portion 72T constitutes a so-called orifice. Each groove portion 72T extends from the second radially inner side of the first valve seat portion 72 to the first valve seat portion 72 while the first opposing portion 521 of the main valve 51 is in contact with the first valve seat portion 72 . A path is formed for the oil to flow outward in the second radial direction. That is, each groove portion 72T allows the oil in the main flow path 71 to pass through the annular space between the first valve seat portion 72 and the second valve seat portion 73 when the main valve 51 is in contact with the first valve seat portion 72 . Allows flow into space 78 .

The groove portion 77 is an annular groove recessed toward the inside of the second shaft. The groove portion 77 is provided at a position facing the first valve contact portion 673 with the main valve 51 interposed therebetween in the second axial direction. The groove portion 77 forms a region for allowing the end portion of the main valve 51 to be displaced toward the inside of the second axis when the main valve 51 is in an open state in which the main flow path 71 is opened.
The outer flow path 79 is formed along the second axial direction and forms a flow path through which oil flows. A plurality of outer flow paths 79 are provided. The outer flow path 79 forms a path through which the oil that flows out from the main flow path 71 when the main valve 51 is opened flows toward an in-housing flow path 124, which will be described later.

(shim 69)
The shim 69 is an annular member that is open on the second radially inner side. The shim 69 has a gap with respect to the main valve 51 and is provided outside the main valve 51 in the second radial direction. The shim 69 restricts movement of the main valve 51 in the second radial direction.

(Orifice plate 85)
As shown in FIG. 4, the orifice plate 85 comprises an outer seat portion 86 provided outside in the second radial direction and an oil flow path for adjusting the oil pressure in the back pressure chamber 100P (see FIG. 2). an inner pilot passage 87 and a plurality of outer pilot passages 88.
The outer seat portion 86 annularly protrudes toward the outer side of the second axis with respect to the bottom surface portion 85B, which is a substantially circular surface provided on the outer side of the second axis. The outer seat portion 86 supports the outer edge portion of the pilot valve 80 .

The inner pilot passage 87 is provided inside the pilot valve 80 in the second radial direction. The inner pilot flow path 87 is provided to pass through the orifice plate 85 in the second axial direction. The inner pilot passage 87 also has an inner round 87R forming a point of contact with the pilot valve 80 on the outer side of the second axis.

The orifice plate 85 includes a first outer pilot flow path 881 , a second outer pilot flow path 882 , and a third outer pilot flow path 883 as the outer pilot flow paths 88 . In the following description, the first outer pilot flow path 881, the second outer pilot flow path 882, and the third outer pilot flow path 883 are collectively referred to as the outer pilot flow path 88 when they are not distinguished from each other. The outer pilot passage 88 has an outer round 88R forming a point of contact with the pilot valve 80 on the second axis outward.

In the plurality of outer pilot channels 88, the heights of the outer rounds 88R are approximately equal when the bottom surface portion 85B is used as a reference. The height of the outer rounds 88R of the plurality of outer pilot passages 88 is then lower than the height of the inner rounds 87R of the inner pilot passages 87, respectively.
Furthermore, the orifice plate 85 has a plurality of outer pilot channels 88 with different inner diameters of the channel ports. That is, the plurality of outer pilot flow paths 88 have different flow path cross-sectional areas at the flow path ports through which the oil flows. Specifically, as shown in FIG. 4, the inner diameter d1 of the flow path port of the first outer pilot flow path 881 is equal to the inner diameter d2 of the flow path port of the second outer pilot flow path 882 and the flow path of the third outer pilot flow path 883. It is larger than the inner diameter d3 of the opening. Also, the inner diameter d2 of the flow path port of the second outer pilot flow path 882 is larger than the inner diameter d3 of the flow path port of the third outer pilot flow path 883 . That is, the channel cross-sectional areas of the channel ports of the plurality of outer pilot channels 88 increase in order of the third outer pilot channel 883 , the second outer pilot channel 882 , and the first outer pilot channel 881 .
Also, the channel cross-sectional area of the channel port of each outer pilot channel 88 is smaller than the channel cross-sectional area of the channel port of the inner pilot channel 87 .

(Pilot valve 80)
As shown in FIG. 4, the pilot valve 80 is a substantially circular plate-shaped member that is elastically deformed. Metal such as iron can be used as the material of the pilot valve 80 . The pilot valve 80 is provided facing the orifice plate 85 on the outside of the second axis.
The pilot valve 80 has a first facing portion 81 facing the inner pilot flow path 87 and a second facing portion 82 facing the outer pilot flow path 88 . Further, the pilot valve 80 includes an inner opening 83 that facilitates deformation of the pilot valve 80 in the second axial direction, and an inner opening 83 that is provided outside the inner opening 83 in the second radial direction to deform the pilot valve 80 in the second axial direction. and an outer opening 84 to facilitate

As shown in FIG. 5, the first facing portion 81 is circular and plate-shaped. The first facing portion 81 can cover the inner round 87R.
The second facing portion 82 is annular and formed in a plate shape. The second facing portion 82 can then cover the outer round 88R.
The adjustment valve 91 of the adjustment portion 90 adjusts the flow rate of oil flowing through the inner pilot flow path 87 and the outer pilot flow path 88 via the pilot valve 80 . Furthermore, the adjustment valve 91 adjusts the oil pressure in the back pressure chamber 100P.

Next, actions of the orifice plate 85 and the pilot valve 80 will be described.
In the main valve portion 50, the easiness of opening the main flow path 71 is determined according to the pressure of the oil in the back pressure chamber 100P. Furthermore, when the main valve portion 50 opens the main flow path 71 , the oil in the back pressure chamber 100</b>P flows into the inflow chamber 631 from the inner pilot flow path 87 and the plurality of outer pilot flow paths 88 .

Here, the pilot valve 80 is more likely to be deformed as the pressure receiving area increases. Therefore, the oil flowing through each of the outer pilot flow paths 88 opens the pilot valve 80 with a time difference in order of the first outer pilot flow path 881, the second outer pilot flow path 882, and the third outer pilot flow path 883. flow out. Finally, the oil flowing through the inner pilot flow path 87 opens the pilot valve 80 and flows into the inflow chamber 631 .
Therefore, in the outer damping section 100, the change in the oil pressure in the back pressure chamber 100P is stepped compared to, for example, a single orifice passage. Due to the stepwise change in the oil pressure in the back pressure chamber 100P, the main valve section 50 opens the main flow path 71 step by step instead of opening all at once.

(Support member 89)
The support member 89 is provided outside the first housing 60 along the second axis, as shown in FIG. The support member 89 has a cylindrical portion 891 and an annular outward projecting portion 892 projecting outward in the second radial direction from the end of the cylindrical portion 891 on the inner side of the second axis.
The cylindrical portion 891 has therein a bearing that supports a plunger 93 (to be described later) movably in the second axial direction.
The outward projecting portion 892 faces the surface of the first housing 60 on the outer side of the second axis with the shim interposed therebetween.

(Connection channel portion 110)
As shown in FIG. 2 , the connection channel portion 110 has an inner channel 111 provided inside in the second radial direction and an outer channel 112 provided outside in the second radial direction.
The inner flow path 111 communicates with the outer cylindrical body opening 12H on the inner side of the second shaft, and communicates with the main flow path 71 of the second housing 70 on the outer side of the second shaft.
A plurality of outer flow paths 112 are provided. The outer channel 112 communicates with the case opening 13H on the inner side of the second shaft, and communicates with the later-described inner housing channel 124 on the outer side of the second shaft.

(External housing 120)
The outer housing 120 includes a substantially cylindrical outer housing 121 provided outside in the second radial direction, and an inner housing 130 provided inside the outer housing 121 in the second radial direction. It can be exemplified that the outer housing 121 and the inner housing 130 are made of metal. Alternatively, it can be exemplified that the outer housing 121 is molded from metal and the inner housing 130 is molded from resin.

The outer housing 121 is fixed to the damper case 13 inside the second shaft by, for example, welding. A female thread 123 is formed on the inner peripheral surface of the outer housing 121 . In addition, the outer housing 121 forms an in-housing channel 124 that is a channel for oil inside the outer housing 121 outside the second housing 70 in the second radial direction. The outer housing 121 is formed with a concave portion 125 recessed from the outer peripheral surface, and the concave portion 125 holds an O-ring 126 that seals between the outer peripheral surface of the outer housing 121 and a cover portion 95 to be described later.

The inner housing 130 has a substantially cylindrical cylindrical portion 131 and an annular annular portion 132 protruding inwardly in the second radial direction from the inner peripheral surface of the cylindrical portion 131 .
A male thread 133 is formed on the end portion of the cylindrical portion 131 on the inner side of the second shaft, and is tightened by a female thread 123 formed on the inner peripheral surface of the outer housing 121 . The cylindrical portion 131 is formed with a recess 134 recessed from the outer peripheral surface at a portion outside the second shaft relative to the male screw 133 . It holds an O-ring 135 that seals with the inner peripheral surface.

A first engaging portion 136 recessed from the inner peripheral surface is formed over the entire circumference of the cylindrical portion 131 at the end portion on the outer side of the second shaft. The first engaging portion 136 will be detailed later.
In addition, the cylindrical portion 131 allows the oil that has flowed into the outflow passage 632 to pass through the space between the inner peripheral surface of the part on the inner side of the second shaft from the annular portion 132 and the outer peripheral surface of the accommodating portion 63 of the first housing 60 . An annular channel is formed leading to the inner channel 124 .
The annular portion 132 is provided so as to face an inner protruding portion 954 of the cover portion 95 described later in the second axis direction, and supports an end portion of the imparting member 952 described later on the inner side of the second axis.

(Adjuster 90)
As shown in FIG. 2, the adjustment unit 90 holds an adjustment valve 91 for controlling oil flow in the inner pilot flow path 87 and the outer pilot flow path 88 (see FIG. 4) of the orifice plate 85, and the adjustment valve 91. It has a plunger 93 and a solenoid portion 94 that drives the plunger 93 . The adjustment unit 90 also has a compression coil spring 97 provided between the pilot valve 80 and the adjustment valve 91 and a magnetic body 98 such as a magnet fixed to the plunger 93 .

The adjustment valve 91 is provided at a position facing the first facing portion 81 and the second facing portion 82 of the pilot valve 80 in the second axial direction. Also, the adjustment valve 91 is movable in the second axial direction. The adjusting valve 91 can come into contact with the pilot valve 80 by moving toward the inner side of the second shaft. In this manner, the adjustment valve 91 can be in any state from the contact state with the pilot valve 80 to the farthest state from the pilot valve 80 . This allows the adjustment valve 91 to adjust the flow rate of oil flowing through the inner pilot flow path 87 and the outer pilot flow path 88 of the orifice plate 85 .

The plunger 93 is a rod-shaped member formed along the second axial direction. The plunger 93 holds the adjustment valve 91 inside the second shaft and holds the magnetic body 98 at the central portion in the direction of the second shaft. The plunger 93 is axially movably supported by a fixed iron core 96 and a support member 89 to be described later via bearings. The plunger 93 is pushed toward the inner side of the second shaft together with the adjustment valve 91 by the solenoid portion 94 when the solenoid portion 94 is in an energized state. On the other hand, the plunger 93 is pushed back outward along with the adjustment valve 91 by the compression coil spring 97 when the solenoid portion 94 is in a non-energized state.

The compression coil spring 97 contacts the pilot valve 80 on the inner side of the second shaft and contacts the adjustment valve 91 on the outer side of the second shaft. Then, the compression coil spring 97 applies force to the adjustment valve 91 in a direction in which the adjustment valve 91 moves away from the pilot valve 80 .

The solenoid portion 94 has a cover portion 95 that covers the opening of the outer housing 120 , a fixed iron core 96 , and a clip 99 that positions the cover portion 95 with respect to the outer housing 120 in the second axial direction.
The clip 99 has a rectangular cross-sectional shape when cut along a plane parallel to the second axial direction, with the second axial direction being the lateral direction and the second radial direction being the longitudinal direction. It is a metal member having a C-shaped cross-section taken along a perpendicular plane.

The cover part 95 holds the coil 951, the applying member 952 that applies a force in the direction toward the outside of the second axis to the outer housing 120, the coil 951 and the applying member 952, and covers the opening of the outer housing 120. and a cover portion 953 . The cover portion 95 is molded by insert molding in which a resin heated to a softening temperature is filled into a mold at a portion corresponding to the cover portion 953 while the metal coil 951 and the applying member 952 are held in a mold. ing.

The imparting member 952 is a member made of metal, and includes an annular orthogonal portion 952a orthogonal to the second axial direction, and a second axial and an inclined portion 952b projecting inwardly of the second axis in a direction inclined with respect to the direction. In the imparting member 952, the orthogonal portion 952a and the inclined portion 952b connected to the orthogonal portion 952a are covered with a cover portion 953 at the outer end of the second axis, and the portion of the inclined portion 952b inside the second axis is covered with the cover portion. It is held by the cover portion 953 so as to be exposed from 953 . The inclined portion 952b has a shape of a so-called disc spring, and is provided with an orthogonal portion 952a to prevent the imparting member 952 from moving with respect to the cover portion 953 . If the inclined portion 952b on the inner side of the second axis is held by the cover portion 953 so as to be exposed from the cover portion 953, the orthogonal portion 952a may not be provided.

The cover portion 953 has a substantially cylindrical inner protrusion portion 954 that protrudes from the disk-shaped portion toward the inside of the second axis and is fitted inside the inner housing 130 of the outer housing 120 , and the inner protrusion portion 954 extends outward in the second radial direction from the inner protrusion portion 954 . and a substantially cylindrical outer protruding portion 955 protruding inwardly of the second axis.
The outer protrusion 955 is provided outside the outer housing 120 in the second radial direction and covers the outer end of the outer housing 120 on the second axis. A gap between the inner peripheral surface of the outer projecting portion 955 and the outer housing 121 of the outer housing 120 is sealed with an O-ring 126 .

The inner projecting portion 954 is provided outside the fixed core 96 in the second radial direction and inside the inner housing 130 in the second radial direction. has a coil 951 at a position that overlaps with the movement area of .

In addition, a second engaging portion 956 recessed from the outer peripheral surface is formed over the entire circumference of the inner protruding portion 954 at a portion on the outer side of the second axis relative to the central portion in the second axial direction. The second engaging portion 956 is formed at a position corresponding to the first engaging portion 136 formed on the cylindrical portion 131 of the inner housing 130 in the second axial direction. A clip 99 is fitted in the second engaging portion 956 and the first engaging portion 136 .

Here, in a cross-sectional shape cut along a plane parallel to the second axial direction, the size of the second engaging portion 956 and the first engaging portion 136 in the second axial direction is equal to the size of the clip 99 in the second axial direction. Bigger than size. In addition, the size of the second engaging portion 956 in the second radial direction is greater than or equal to the size of the clip 99 in the second radial direction, and the size of the first engaging portion 136 in the second radial direction is equal to or larger than the size of the clip 99 in the second radial direction. is less than the second radial dimension at . When the cover portion 95 is assembled to the outer housing 120, the clip 99 is elastically deformed so as to be reduced in diameter and completely embedded in the second engaging portion 956 of the inner protruding portion 954. A protrusion 954 is inserted inside the inner housing 130 . After that, when the clip 99 is inserted to a position corresponding to the first engaging portion 136 formed in the inner housing 130, the diameter is expanded so that the second radially outer portion of the clip 99 becomes the first engaging portion. Fits in 136. After the cover portion 95 is attached to the outer housing 120, the inner surface of the clip 99 on the inner side of the second shaft abuts the surface of the second engaging portion 956 on the inner side of the second shaft, and the outer surface of the clip 99 on the outer side of the second shaft. abuts the surface of the first engaging portion 136 on the outer side of the second axis, the cover portion 95 is prevented from coming off from the outer housing 120 .

In addition, the inner protruding portion 954 holds the applying member 952 at the inner end portion of the second shaft. When the inner projecting portion 954 is inserted into the inner housing 130 , the end portion of the inclined portion 952 b on the inner side of the second axis of the imparting member 952 contacts the annular portion 132 of the inner housing 130 so as to extend outward on the second axis. is placed in an elastically deformed state so as to move to Due to the elastic force of the imparting member 952 , the cover portion 95 is imparted with force in the direction toward the outer side of the second axis with respect to the outer housing 120 . As described above, the clip 99 prevents the cover portion 95 from coming off the outer housing 120, so that the position of the cover portion 95 is determined.

The outer damping section 100 configured as described above can be assembled as follows. In other words, the operator attaches the connecting flow passage portion 110, the second housing 70, the shim 69, the main valve portion 50, the orifice plate 85, the pilot valve 80, and the first housing to the outer housing 121 fixed to the damper case 13. 60, regulating valve 91, plunger 93, support member 89, fixed iron core 96 and the like are assembled. The operator then tightens the inner housing 130 to the outer housing 121 . Then, the cover portion 95 holding the clip 99 is assembled to the outer housing 120 .

[Operation of hydraulic shock absorber 1]
Next, the operation of the hydraulic shock absorber 1 configured as described above will be specifically described.
6 and 7 are explanatory diagrams of the operation of the hydraulic shock absorber 1 of the first embodiment.
6 shows the flow of oil during the extension stroke, and FIG. 7 shows the flow of oil during the compression stroke.

First, the operation of the hydraulic shock absorber 1 during the extension stroke will be described.
As shown in FIG. 6, the rod 20 moves to the other side with respect to the cylinder 11 during the extension stroke. At this time, the piston valve 32 remains blocking the piston oil passage port 311 . Further, the movement of the piston portion 30 to the other side reduces the volume of the second oil chamber Y2. Then, the oil in the second oil chamber Y2 flows out to the communication path L from the cylinder opening 11H.
Furthermore, the oil flows into the outer damping portion 100 through the communication path L and the outer cylinder body opening 12H. In the outer damping section 100 , oil first flows into the inner flow path 111 of the connecting flow path section 110 . After that, in the outer damping portion 100 , a damping force is generated in the main valve 51 . The flow of oil at this time will be described later in detail.
After that, the oil that has flowed to the main valve 51 flows out to the in-housing channel 124 . Furthermore, the oil flows into the reservoir chamber R from the case opening 13H through the outer flow path 112 of the connection flow path portion 110 .
Also, the pressure in the first oil chamber Y1 is relatively low with respect to the reservoir chamber R. Therefore, the oil in the reservoir chamber R passes through the bottom portion 40 and flows into the first oil chamber Y1.

Next, the operation of the hydraulic shock absorber 1 during the compression stroke will be described.
As shown in FIG. 7, the rod 20 relatively moves to one side with respect to the cylinder 11 during the compression stroke. In the piston portion 30, the piston valve 32 closing the piston oil passage opening 311 opens due to the differential pressure between the first oil chamber Y1 and the second oil chamber Y2. The oil in the first oil chamber Y1 flows through the piston oil passage port 311 into the second oil chamber Y2. Here, a rod 20 is arranged in the second oil chamber Y2. Therefore, the amount of oil flowing from the first oil chamber Y1 to the second oil chamber Y2 becomes excessive by the volume of the rod 20 . Therefore, an amount of oil corresponding to the volume of the rod 20 flows out to the communication path L from the cylinder opening 11H.
Further, the oil flows into the outer damping portion 100 through the communication path L and the opening 12H of the outer cylinder. The oil flow in the outer damping portion 100 is the same as the oil flow during the extension stroke described above. That is, in the hydraulic shock absorber 1 of the first embodiment, the oil flows in the same direction in the outer damping portion 100 during both the compression stroke and the extension stroke.
As described above, in the hydraulic shock absorber 1 of the first embodiment, the outer damping portion 100 generates a damping force in both the compression stroke and the extension stroke.

Next, the flow of oil in the outer damping section 100 of the first embodiment will be described in detail.
8 and 9 are explanatory diagrams of the oil flow in the outer damping section 100 of the first embodiment.
FIG. 8 is an explanatory diagram of the outer damping section 100 when the damping force generated by the main valve 51 is adjusted by the adjusting section 90 to be relatively low. FIG. 9 is an explanatory diagram of the outer damping section 100 when the damping force generated by the main valve 51 is adjusted by the adjusting section 90 to be relatively high.

First, the operation of the adjusting section 90 that adjusts the pressure of the oil in the back pressure chamber 100P will be described. The distance of the adjustment valve 91 from the orifice plate 85 changes according to the amount of current flowing through the solenoid portion 94 (see FIG. 2). The amount of current flowing through the solenoid portion 94 is controlled based on, for example, an ECU (Electronic Control Unit) that performs various controls in the vehicle. The adjustment unit 90 brings the adjustment valve 91 closer to the pilot valve 80 as the larger current flows through the solenoid unit 94 . On the other hand, the adjustment portion 90 causes the adjustment valve 91 to move further away from the pilot valve 80 as a relatively smaller current flows through the solenoid portion 94 .

Then, for example, the ECU makes the current amount of the solenoid portion 94 of the adjustment portion 90 relatively small. In this example, the amount of current that flows through the solenoid portion 94 is set to zero. As a result, the regulating valve 91 is located far from the pilot valve 80, as shown in FIG. This makes it easier for the oil in the back pressure chamber 100</b>P to flow out from the inner pilot flow path 87 and the outer pilot flow path 88 of the orifice plate 85 into the inflow chamber 631 . In this case, the pressure of the oil in the back pressure chamber 100P becomes relatively low.

On the other hand, for example, the ECU makes the current amount of the solenoid portion 94 of the adjustment portion 90 relatively large. This places the regulating valve 91 near the pilot valve 80, as shown in FIG. This makes it difficult for the oil in the back pressure chamber 100</b>P to flow out from the inner pilot flow path 87 and the outer pilot flow path 88 of the orifice plate 85 into the inflow chamber 631 . In this case, the pressure of the oil in the back pressure chamber 100P becomes relatively high.

Then, the adjustment section 90 can arbitrarily adjust the distance between the pilot valve 80 and the adjustment valve 91 within a predetermined range according to the amount of current flowing through the solenoid section 94 . The adjusting section 90 can adjust the pressure of the oil in the back pressure chamber 100</b>P to a predetermined pressure in accordance with the amount of current that flows through the solenoid section 94 .

Next, the flow of oil that opens the main valve 51 will be specifically described.
As shown in FIG. 8 , the axial movement of the piston portion 30 (see FIG. 1 ) causes the oil that has flowed into the inner flow path 111 to flow into the main flow path 71 .
Then, the oil that has flowed into the main flow path 71 flows into the back pressure chamber 100P from the orifice portion 52F.
In the example shown in FIG. 8, the oil in the back pressure chamber 100P easily flows out from the inner pilot passage 87 and the outer pilot passage 88 of the orifice plate 85 into the inflow chamber 631. In the example shown in FIG. Therefore, the oil pressure in the back pressure chamber 100P is relatively low.

Here, as described above, the adjustment unit 90 determines the pressure of the back pressure chamber 100P. When the main valve 51 of the main valve section 50 receives a fluid pressure in the opening direction greater than the force in the direction of closing the first valve seat portion 72 and the second valve seat portion 73, the main valve 51 is closed. rises from the first valve seat portion 72 and the second valve seat portion 73 to open the main flow path 71 . At this time, the pressure in the back pressure chamber 100</b>P determines the channel cross-sectional area, which is the gap between the main valve 51 and the first valve seat portion 72 and the second valve seat portion 73 . That is, the pressure in the back pressure chamber 100P determines the flow rate, that is, the damping force.

Then, as shown in FIG. 8, the oil that has flowed into the main flow path 71 is directed so that the main valve 51 is separated from the first valve seat portion 72 (see FIG. 3) and the second valve seat portion 73 (see FIG. 3). It flows through the gap between the first valve seat portion 72 and the second valve seat portion 73 and the main valve 51 while being deformed.
In the outer damping portion 100, the damping force is generated by the differential pressure generated by the gap between the main valve 51 and the first valve seat portion 72 or the second valve seat portion 73 of the second housing 70, which restricts the oil flow rate. Occur.
After that, the oil that has flowed out from the main flow passage 71 by opening the main valve 51 flows through the outer flow passage 79 , the in-housing flow passage 124 and the outer flow passage 112 in that order, and then flows out into the reservoir chamber R.

On the other hand, as shown in FIG. 9, the oil that has flowed into the inner flow path 111 flows into the main flow path 71 by moving the piston portion 30 (see FIG. 1) in the axial direction.
Then, the oil that has flowed into the main flow path 71 flows into the back pressure chamber 100P from the orifice portion 52F.
Here, in the example shown in FIG. 9, it is difficult for the oil in the back pressure chamber 100P to flow out from the orifice portion 52F of the orifice plate 85 into the inflow chamber 631. As shown in FIG. Therefore, the oil pressure in the back pressure chamber 100P is relatively high.

The oil that has flowed into the main flow passage 71 deforms the main valve 51 away from the first valve seat portion 72 and the second valve seat portion 73, and flows through the first valve seat portion 72 (see FIG. 3) and the second valve seat portion 73. It tries to flow through the gap between the second valve seat portion 73 (see FIG. 3) and the main valve 51 . However, in the example shown in FIG. 9, the pressure in the back pressure chamber 100P is relatively high. Therefore, the main valve 51 receives pressure from the back pressure chamber 100</b>P and is pressed relatively strongly toward the first valve seat portion 72 and the second valve seat portion 73 . Therefore, it is difficult for the main valve 51 to open the first valve seat portion 72 and the second valve seat portion 73 to allow the oil in the main flow path 71 to flow. Therefore, the damping force generated in the outer damping section 100 in the state shown in FIG. 9 is relatively high.
After that, the oil that has flowed out from the main flow passage 71 by opening the main valve 51 flows through the outer flow passage 79 , the in-housing flow passage 124 and the outer flow passage 112 in that order, and then flows out into the reservoir chamber R.

As described above, in the outer damping section 100, the magnitude of the damping force generated by the main valve 51 can be adjusted by changing the pressure of the oil in the back pressure chamber 100P using the adjusting section 90.

The outer damping portion 100 described above has a cylindrical shape, and the first engagement portion is recessed in a second radial direction, which is an example of a direction intersecting with a second axial direction, which is an example of a centerline direction, from the inner peripheral surface. An outer housing 120 is provided as an example of a housing in which 136 is formed. Further, the outer damping portion 100 includes a cover portion 95 as an example of a fitting member that is fitted inside the outer housing 120 and has a second engaging portion 956 that is recessed in the second radial direction from the outer peripheral surface. A clip 99 is provided so as to straddle the first engaging portion 136 and the second engaging portion 956 . In the outer damping section 100 , the cover section 95 is provided integrally with the cover section 95 and serves as an application section 150 that applies force in the second axial direction so as to separate from the outer housing 120 . It has a member 952 .

According to the outer damping section 100 configured as described above, the applying member 952 applies force so that the cover section 95 is separated from the outer housing 120 . Since the clip 99 prevents the cover portion 95 from coming off from the outer housing 120, the position of the cover portion 95 is determined. In addition, since the applying member 952 is provided integrally with the cover portion 95 and no other parts are separately provided to determine the position of the cover portion 95, the number of parts does not increase. As a result, an increase in assembly man-hours and part management man-hours due to an increase in the number of parts can be suppressed.

In addition, the outer housing 120 has an annular portion 132 as an example of an inwardly projecting portion projecting inward in the second radial direction from the inner peripheral surface, and the applying portion 150 faces the annular portion 132 of the cover portion 95. It is provided at a portion where the contact portion 132 is formed, and is elastically deformed by contacting the annular portion 132 . Thereby, it becomes possible to apply a force in the second axial direction so as to separate from the outer housing 120 with high accuracy.
The cover portion 95 is made of resin, and the imparting portion 150 is an imparting member 952 as an example of a metal member insert-molded in the cover portion 95 . This makes it possible to provide the applying member 952 integrally with the cover portion 95 .

In the above-described embodiment, as an example of the applying portion 150 that applies a force in the second axial direction to the cover portion 95 so as to be separated from the outer housing 120, a metal insert-molded portion of the cover portion 95 is used. Although the applying member 952 is provided, it is not particularly limited to such an aspect. For example, the shape corresponding to the inclined portion 952 b exposed from the cover portion 953 of the cover portion 95 may be formed integrally with the cover portion 953 with resin as the imparting portion 150 .

<Second embodiment>
FIG. 10 is a diagram showing an example of a schematic configuration of the outer damping section 200 according to the second embodiment.
The outer damping portion 200 according to the second embodiment differs from the outer damping portion 100 according to the first embodiment in that the applying portion 250 is provided on the annular portion 132 of the inner housing 130, and the first engaging portion 200 is provided. The portion 136 and the second engaging portion 956 are different. Differences from the first embodiment will be described below. The same reference numerals are used for the same items in the first embodiment and the second embodiment, and detailed descriptions thereof are omitted.

The inner housing 230 of the outer housing 220 according to the second embodiment has an inclined portion 233 projecting outward along the second axis in a direction inclined with respect to the direction of the second axis, at a portion of the annular portion 232 outside the second axis. have. It can be exemplified that the inclined portion 233 has a shape symmetrical to the inclined portion 952b of the imparting member 952 according to the first embodiment with respect to a plane orthogonal to the second axial direction.
Also, the cover portion 295 according to the second embodiment does not have the applying member 952 according to the first embodiment.

The first engaging portion 136 according to the second embodiment is formed on the end portion of the cylindrical portion 131 on the outer side of the second axis over the entire circumference in a shape protruding from the inner peripheral surface. In addition, the second engaging portion 956 according to the second embodiment protrudes from the outer peripheral surface of the inner protruding portion 954 at a portion on the outer side of the second axial direction relative to the central portion in the second axial direction. formed. The clip 99 is fitted between the first engaging portion 136 and the second engaging portion 956 between the inner peripheral surface of the cylindrical portion 131 and the outer peripheral surface of the inner protruding portion 954 .

When the inner protrusion 954 is inserted into the inner housing 230 , the inner end of the inclined portion 233 of the inner housing 230 contacts the inner end of the second shaft of the inner protrusion 954 . and is elastically deformed so as to move toward the inside of the second axis. Due to the elastic force of the inclined portion 233 , a force directed toward the outside of the second axis is applied to the cover portion 295 with respect to the outer housing 220 . Since the clip 99 prevents the cover portion 295 from coming off from the outer housing 220, the position of the cover portion 295 is determined.

In the configuration as described above, the inclined portion 233 of the inner housing 230 functions as the applying portion 250 that applies force to the cover portion 295 in the second axial direction so as to separate it from the outer housing 220 .
Note that the inclined portion 233 may be integrally formed with a mold as a part of the inner housing 230 together with other portions, or may be fixed to the inner housing 230 by welding or the like after the inner housing 230 is formed. May be.

As described above, in the outer damping section 200 , the outer housing 220 , which is one of the outer housing 220 and the cover section 295 , is provided integrally with the outer housing 220 and separated from the cover section 295 . has an inclined portion 233 as an example of the applying portion 250 that applies force in the second axial direction.

<Third Embodiment>
FIG. 11 is a diagram showing an example of a schematic configuration of the outer damping section 300 according to the third embodiment.
FIG. 12 is a diagram showing an example of a schematic configuration of the imparting member 352 according to the third embodiment.
In the outer damping portion 300 according to the third embodiment, the shape of the applying portion 350 is different from that of the applying portion 150 according to the first embodiment. In other words, the shape of the applying member 352 of the cover portion 395 according to the third embodiment differs from the shape of the applying member 952 according to the first embodiment. Also, the outer damping portion 300 differs from the first embodiment in the second engaging portion 956 . Differences from the first embodiment will be described below. The same reference numerals are used for the same items in the first embodiment and the third embodiment, and detailed description thereof will be omitted.

As shown in FIGS. 11 and 12, the applying member 352 according to the third embodiment has an annular orthogonal portion 352a orthogonal to the second axial direction, and from the second radially inner end of the orthogonal portion 352a, and a plurality of arm portions 352b that protrude inwardly of the second axis in a direction that is inclined with respect to the direction of the second axis. The plurality of arm portions 352b are provided at regular intervals in the circumferential direction. In the imparting member 352, the orthogonal portion 352a and the ends of the plurality of arms 352b connected to the orthogonal portion 352a on the outer side of the second axis are covered with a cover portion 953, and the inner sides of the plurality of arms 352b on the second axis are covered. The part is held by the covering portion 953 so as to be exposed from the covering portion 953 .

In the imparting member 352, when the inner projecting portion 954 is inserted inside the inner housing 130, the ends of the plurality of arm portions 352b inside the second axis contact the annular portion 132 of the inner housing 130 to form the second axis. It is arranged in an elastically deformed state so as to move axially outward. Due to the elastic force of the applying member 352 , a force is applied to the outer housing 120 toward the outer side of the second axis. Since the clip 99 prevents the cover portion 395 from coming off from the outer housing 120, the position of the cover portion 395 is determined.

The first engaging portion 136 according to the third embodiment is the same as the first engaging portion 136 according to the first embodiment, and the second engaging portion 956 according to the third embodiment is different from the second embodiment. This is the same as the second engaging portion 956 concerned. The clip 99 is fitted into the first engaging portion 136 at a position outside the second axis relative to the second engaging portion 956 .

In the configuration as described above, the applying member 352 functions as the applying part 350 that applies a force in the second axial direction to the cover part 395 so as to separate from the outer housing 120 .
In the above-described embodiment, a concave portion (second 3) may be formed, and the end of the arm portion 352b may be fitted into the recess. This makes it possible to prevent the imparting member 352 from rotating in the circumferential direction.

Further, in the above-described embodiment, the metal applying member 352 is provided in the cover portion 395 by insert molding, but the present invention is not particularly limited to this aspect. For example, the applying portion 350 may be formed by forming a shape corresponding to the plurality of arm portions 352b integrally with the covering portion 953 with resin.
Further, instead of providing the applying portion 350 on the cover portion 395 side, portions corresponding to the plurality of arm portions 352b are provided on the annular portion 132 side of the inner housing 130 like the applying portion 250 according to the second embodiment. You can set it.

<Fourth Embodiment>
FIG. 13 is a diagram showing an example of a schematic configuration of the outer damping section 400 according to the fourth embodiment.
FIG. 14 is a diagram showing an example of a schematic configuration of the imparting member 452 according to the fourth embodiment.
In the outer damping portion 400 according to the fourth embodiment, the shape of the applying portion 450 is different from that of the applying portion 150 according to the first embodiment. In other words, the shape of the applying member 452 of the cover portion 495 according to the fourth embodiment differs from the shape of the applying member 952 according to the first embodiment. Also, the outer damping portion 400 differs from the first embodiment in the first engaging portion 136 . Differences from the first embodiment will be described below. The same reference numerals are used for the same items in the first embodiment and the fourth embodiment, and detailed description thereof will be omitted.

As shown in FIGS. 13 and 14, the imparting member 452 according to the fourth embodiment has two orthogonal portions 452a orthogonal to the second axial direction, and an arc-shaped portion 452b connecting the two orthogonal portions 452a. have The two orthogonal portions 452a are provided on the second radially inner side and the second radially outer side, respectively. The arcuate portion 452b is formed to protrude inwardly of the second shaft. In the imparting member 452, two orthogonal portions 452a and an arc-shaped portion 452b connected to the two orthogonal portions 452a are covered with a cover portion 953 at the outer ends of the second axis. The inner portion is held by the cover portion 953 so as to be exposed from the cover portion 953 .
The cover portion 495 has a plurality of (for example, four) imparting members 452 at regular intervals in the circumferential direction.

When the inner projecting portion 954 is inserted into the inner housing 130 , the end portions of the arcuate portions 452 b contact the annular portion 132 of the inner housing 130 to contact the annular portion 132 of the inner housing 130 . It is arranged in an elastically deformed state so as to move outward on two axes. Due to the elastic force of the applying member 452 , a force is applied to the outer housing 120 toward the outside of the second axis to the cover portion 495 . Since the clip 99 prevents the cover portion 495 from coming off from the outer housing 120, the position of the cover portion 495 is determined.

The first engaging portion 136 according to the fourth embodiment is the same as the first engaging portion 136 according to the second embodiment, and the second engaging portion 956 according to the fourth embodiment is similar to the first engaging portion 956. This is the same as the second engaging portion 956 concerned. The clip 99 is fitted into the second engaging portion 956 at a position on the inner side of the second axis relative to the first engaging portion 136 .

In the configuration as described above, the applying member 452 functions as the applying part 450 that applies a force in the second axial direction to the cover part 495 so as to separate from the outer housing 120 .
In the above-described embodiment, a recess ( An example of a fourth engaging portion) may be formed, and the end portion of the arcuate portion 452b may be fitted into the recess. This makes it possible to prevent the imparting member 452 from rotating in the circumferential direction.

In addition, in the above-described embodiment, the metal applying member 452 is provided in the cover portion 495 by insert molding, but the present invention is not particularly limited to such an aspect. For example, the applying portion 450 may be formed by forming a shape corresponding to the applying member 452 integrally with the covering portion 953 with resin.
In addition, instead of providing the applying portion 450 on the cover portion 495 side, portions corresponding to the plurality of applying members 452 are provided on the annular portion 132 side of the inner housing 130 like the applying portion 250 according to the second embodiment. You can set it.

For example, in the first embodiment, the imparting member 952 is provided at a portion of the inner protruding portion 954 of the cover portion 95 that faces the annular portion 132 of the inner housing 130 . As long as the force is applied in the direction of the second axis so as to move away from the outer housing 120, the position is not particularly limited. For example, it is applied to a portion between the inner protruding portion 954 and the outer protruding portion 955 of the cover portion 953 of the cover portion 95 and facing the outer end portion of the second axis of the cylindrical portion 131 of the inner housing 130 . A member 952 may be provided and brought into contact with this end for elastic deformation. Alternatively, the imparting member 952 may be provided at a portion of the outer protruding portion 955 of the cover portion 95 facing the end portion of the outer housing 121 on the outer side of the second axis, and brought into contact with this end portion to be elastically deformed. The same applies to the imparting member 352 and the imparting member 452 according to the third embodiment and the fourth embodiment.

In addition, in the second embodiment, the inclined portion 233 is provided at a portion of the annular portion 232 of the inner housing 230 that faces the inner projecting portion 954 of the cover portion 295 . The position is not particularly limited as long as the force is applied in the direction of the second axis so as to move away from 220 . For example, the cylindrical portion 131 of the inner housing 230 may be provided with an inclined portion 233 at the outer end portion of the second axis, and brought into contact with the cover portion 295 to be elastically deformed. Alternatively, an inclined portion 233 may be provided on the outer end portion of the second axis in the outer housing 121 and brought into contact with the cover portion 295 to be elastically deformed.

Further, in the first to fourth embodiments, the piston part 30 and the bottom part 40 are not limited to the structures shown in the above embodiments, and may have other shapes or other shapes as long as they satisfy the function of the damping mechanism. configuration is also acceptable.
Also, the components described in the first to fourth embodiments may be combined or exchanged with each other.
Furthermore, the functions of the outer damping portions 100, 200, 300, and 400 provided outside the cylinder 11 may be provided in the piston portion 30 inside the cylinder 11 and the like. Similarly, the functions of the outer damping portions 100, 200, 300, and 400 provided outside the cylinder 11 may be provided in the bottom portion 40 or the like. The hydraulic shock absorbers 1 of the first to fourth embodiments are not limited to a so-called triple tube structure in which the cylinder 11, the outer cylindrical body 12, and the damper case 13 are each configured in a cylindrical shape. A so-called double pipe structure with the damper case 13 may be used.

DESCRIPTION OF SYMBOLS 1... Hydraulic shock absorber 11... Cylinder 20... Rod 30... Piston part 50... Main valve part 51... Main valve 90... Adjustment part 94... Solenoid part 95, 395, 495... Cover part 99 Clip 100, 200, 300, 400 Outer damping portion 120, 220 Outer housing 121 Outer housing 130, 230 Inner housing 132, 232 Annular portion 136 First engagement portion Reference Signs List 150,250,350,450 Applied portion 233 Inclined portion 352,452,952 Applied member 952a Orthogonal portion 952b Inclined portion 956 Second engaging portion

Claims (8)

a cylindrical housing having a first engaging portion that is recessed or protruded from the inner peripheral surface in a direction intersecting the centerline direction;
a fitting member that is fitted inside the housing and has a second engaging portion that is recessed or protrudes from an outer peripheral surface in a direction crossing the center line direction;
a clip provided to straddle the first engaging portion and the second engaging portion;
with
Either one of the housing and the fitting member has an applying portion that is provided integrally with the one member and applies a force in the centerline direction so as to separate from the other member.
Damping force generator. The housing has an inward projection projecting inward from the inner peripheral surface in a direction crossing the centerline direction,
The imparting portion is provided at a portion of the fitting member facing the inwardly protruding portion, and is elastically deformed by contacting the inwardly protruding portion.
The damping force generator according to claim 1. The fitting member is made of resin,
The applying portion is a metal member partially embedded in the fitting member.
The damping force generator according to claim 2. The metal member is a disc spring, and a portion in the centerline direction is embedded in the fitting member.
The damping force generator according to claim 3. The metal member includes an annular orthogonal portion orthogonal to the centerline direction, and a plurality of members projecting from an inner end portion of the orthogonal portion toward the inward projecting portion in a direction inclined with respect to the centerline direction. an arm,
The damping force generator according to claim 3. The inward protrusion has a third engaging portion that engages with part or all of the arm,
The damping force generator according to claim 5. The metal member has two orthogonal portions orthogonal to the center line direction, and an arc-shaped portion provided between the two orthogonal portions and projecting in an arc shape toward the inwardly projecting portion.
The damping force generator according to claim 3. The inward projecting portion has a fourth engaging portion that engages part or all of the arc-shaped portion,
The damping force generator according to claim 7.

Images