JP7320481B2 - buffer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping force adjustable shock absorber that controls the flow of working fluid generated by the stroke of a piston rod to adjust damping force.

Patent Document 1 discloses a partition wall portion that determines the flow direction of hydraulic fluid flowing from a damping force generating mechanism (control valve device) to a reservoir through an opening formed in an outer cylinder and the outer circumference of a separator tube (connection pipe). (hereinafter referred to as "conventional shock absorber") is disclosed.

JP 2016-23661 A

By the way, the damping force generating mechanism can be miniaturized by connecting the main body (connection member) to the outer circumference (branch pipe) of the connection pipe so that the axial length is shortened. However, if the main body is connected to the outer periphery of the connecting pipe, the baffle plate cannot be fixed to the outer periphery of the connecting pipe.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shock absorber in which a baffle plate can be fixed to a connecting pipe even when a damping force generating mechanism is connected to the outer circumference of the connecting pipe.

The shock absorber of the present invention includes a cylinder filled with hydraulic fluid, a piston inserted into the cylinder and defining the inside of the cylinder into two chambers, an outer cylinder provided on the outer circumference of the cylinder, and the cylinder. a reservoir formed between and the outer cylinder and filled with the hydraulic fluid and gas; a connecting pipe provided between the cylinder and the outer cylinder and communicating with the cylinder; a damping force generating mechanism having a connection member connected to the outer periphery of the valve case provided outside the outer cylinder and accommodating the damping force generating mechanism; Controlling the direction of the flow of the hydraulic fluid provided in the reservoir through which the force generating mechanism flows to the reservoir through the outside of the connection pipe and the hydraulic fluid that flows into the reservoir from the damping force generating mechanism through the opening. and a partition wall member having a partition wall portion, wherein the partition member has a seal portion that seals between the connection pipe and the connection member.

According to the present invention, the baffle plate can be fixed to the connecting pipe even if the damping force generating mechanism is connected to the outer periphery of the connecting pipe.

It is a sectional view of a buffer concerning a 1st embodiment. FIG. 2 is an enlarged view of a damping force generating mechanism in FIG. 1; It is a front view of a baffle plate concerning a 1st embodiment. It is an explanatory view of the second embodiment, and is an enlarged view of a damping force generating mechanism.

(First embodiment)
A first embodiment of the present invention will be described with reference to the accompanying drawings. For the sake of convenience, the vertical direction in FIG. 1 will be referred to as the "vertical direction" as it is. Further, the left direction (left side) in FIG. 2 is referred to as "cylinder direction (cylinder side)" and the right direction (right side) is referred to as "counter-cylinder direction (counter-cylinder side)".

FIG. 1 is a sectional view along an axial plane of the shock absorber 1 according to the first embodiment. The damper 1 is a so-called control-valve-mounted damping force adjustable hydraulic damper in which a damping force generating mechanism 30 is laterally attached to the outer surface of the outer cylinder 3 . The shock absorber 1 has a double cylinder structure in which a cylinder 2 is provided inside an outer cylinder 3 . A reservoir 4 is formed between the outer cylinder 3 and the cylinder 2 . A piston 5 is slidably fitted in the cylinder 2 to divide the inside of the cylinder 2 into two chambers, a cylinder upper chamber 2A and a cylinder lower chamber 2B. A lower end of a piston rod 6 is connected to the piston 5 .

The upper end side of the piston rod 6 passes through the cylinder upper chamber 2A, is inserted through a rod guide 8 and an oil seal 9 attached to the upper ends of the cylinder 2 and the outer cylinder 3, and protrudes outside the cylinder 2. As shown in FIG. The piston 5 is provided with an extension side passage 11 and a compression side passage 12 that connect the cylinder upper chamber 2A and the cylinder lower chamber 2B. The compression side passage 12 is provided with a check valve 13 that allows the hydraulic fluid to flow from the cylinder lower chamber 2B to the cylinder upper chamber 2A. The extension-side passage 11 is provided with a disk valve 14 that opens when the pressure on the side of the cylinder upper chamber 2A reaches a set pressure to release the pressure on the side of the cylinder upper chamber 2A to the side of the cylinder lower chamber 2B.

A base valve 10 that separates the cylinder lower chamber 2B and the reservoir 4 is provided at the lower end of the cylinder 2 . The base valve 10 is provided with an extension side passage 15 and a compression side passage 16 that communicate the cylinder lower chamber 2</b>B and the reservoir 4 . The extension-side passage 15 is provided with a check valve 17 that allows the hydraulic fluid to flow from the reservoir 4 side to the cylinder lower chamber 2B side. The compression side passage 16 is provided with a disk valve 18 that opens when the pressure on the side of the cylinder lower chamber 2B reaches a set pressure to release the pressure on the side of the cylinder lower chamber 2B to the reservoir 4 side. Hydraulic fluid is enclosed in the cylinder 2 . Further, the reservoir 4 is filled with hydraulic fluid and gas.

A separator tube 20 (connection tube) is provided on the outer circumference of the cylinder 2 . The separator tube 20 is provided with a pair of upper and lower sealing members 19 , 19 . An annular channel 21 is formed between the seal members 19 , 19 and between the cylinder 2 and the separator tube 20 . The annular flow path 21 communicates with the cylinder upper chamber 2</b>A through a passage 22 provided in the side wall of the cylinder 2 . A cylindrical branch tube 23 is provided at the lower portion of the side wall of the separator tube 20 and protrudes in the anti-cylinder direction (“rightward direction” in FIG. 1) and has an open end. A side wall of the outer cylinder 3 is provided with an opening 24 coaxial with the branch pipe 23 . The opening 24 has an inner diameter that is larger than the outer diameter of the branch pipe 23 . A substantially cylindrical valve case 25 is provided on the outer surface of the outer cylinder 3 so as to surround the opening 24 . A damping force generating mechanism 30 is housed in the valve case 25 .

As shown in FIG. 2 , the damping force generating mechanism 30 includes a disc-shaped main valve 51 , an annular main body 52 with which the main valve 51 abuts, and a main valve 51 provided behind the main valve 51 so that the internal pressure is applied to the main valve 51 . , a substantially cylindrical pilot case 73 forming the back pressure chamber 72, and the internal pressure of the back pressure chamber 72 are adjusted to control the valve opening pressure of the main valve 51. a pilot body 74 with which the pilot valve 71 abuts; a fail-safe valve 107 provided downstream of the pilot valve 71;

An annular seat portion 53 is provided on the side opposite to the cylinder of the outer peripheral edge of the main body 52 , against which the outer peripheral edge of the main valve 51 abuts so as to be separable and seatable. An annular concave portion 55 coaxial with the main body 52 is formed on the inner peripheral side of the seat portion 53 . A cylindrical portion 56 coaxial with the main body 52 is provided on the cylinder side of the outer peripheral edge of the main body 52 . The branch pipe 23 of the separator tube 20 is connected (inserted) inside the cylindrical portion 56 . The main body 52 is provided with a plurality of passages 59 (only "two" are shown in FIG. 2) that connect the annular recess 55 to the annular flow path 21 .

The inner peripheral portion of the main valve 51 is sandwiched between the inner peripheral portion 54 of the main body 52 and the inner peripheral portion 76 of the pilot case 73 . An annular packing 60 is joined to the rear surface of the outer peripheral portion of the main valve 51 . An annular concave portion 77 coaxial with the pilot case 73 is formed in the cylinder-side end surface of the pilot case 73 . A sliding surface 78 for the packing 60 , which is an inner cylindrical surface coaxial with the pilot case 73 , is formed in the annular recess 77 . An annular seat portion 79 coaxial with the pilot case 73 is formed on the inner peripheral edge portion of the annular recessed portion 77 . The outer peripheral edge portion of the disk-shaped back pressure introduction valve 81 abuts on the seat portion 79 in a separable manner. An annular recess 80 coaxial with the pilot case 73 is formed on the inner periphery of the seat portion 79 .

The inner peripheral portion of the back pressure introduction valve 81 is sandwiched between the inner peripheral portion 54 of the main body 52 and the inner peripheral portion 76 of the pilot case 73 . Between the inner peripheral portion 54 of the main body 52 and the inner peripheral portion 76 of the pilot case 73, the main valve 51, the laminated disk component 63, and the back pressure introduction valve 81 are arranged in this order from the cylinder side to the counter-cylinder side. Interposed. A pin portion 85 integrally formed with the pilot case 73 is inserted through the shaft holes of the main valve 51 , the disk component 63 , and the back pressure introducing valve 81 .

The pin portion 85 is provided coaxially with the pilot case 73 and extends from the pilot case 73 in the cylinder direction. The pin portion 85 is inserted through the shaft hole 61 of the main body 52 and positioned inside the cylindrical portion 56 of the main body 52 (inside the branch pipe 23 ). A nut 87 is screwed onto a threaded portion 86 formed at the tip of the pin portion 85 . The nut 87 is provided inside the branch pipe 23 . By tightening the nut 87 screwed onto the threaded portion 86 , an axial force is applied to the upstream valve component between the washer 88 and the pilot case 73 . When tightening the nut 87, a tool is engaged with a width across flats 89 formed on the outer peripheral surface of the pilot case 73 (only one surface is shown in FIG. 2).

A concave portion 91 coaxial with the pilot case 73 is formed in the end surface of the bottom portion 75 of the pilot case 73 opposite to the cylinder. The concave portion 91 communicates with the annular concave portion 80 by a plurality of passages 92 (only "two" are shown in FIG. 2) that penetrate the pilot case 73 in the axial direction (horizontal direction in FIG. 2). The recess 91 communicates with the annular flow path 21 through an introduction passage 93 formed in the pilot case 73 . An introduction orifice 94 is formed at the end of the introduction passage 93 on the cylinder side (the tip of the pin portion 85). The hydraulic fluid in the annular flow path 21 is introduced into the back pressure chamber 72 via the introduction orifice 94 , the introduction passage 93 , the recess 91 , the passage 92 , the annular recess 80 and the back pressure introduction valve 81 . A plurality of orifices (reference numerals omitted) are formed in the outer peripheral edge of the back pressure introduction valve 81 to constantly communicate the back pressure chamber 72 and the annular flow path 21 .

The pilot body 74 is formed in a substantially bottomed cylindrical shape that is open on the side opposite to the cylinder. The outer peripheral surface 83 of the pilot body 74 is fitted to the inner peripheral surface 96 of the pilot case 73 . The pilot body 74 is axially positioned with respect to the pilot case 73 by contacting the bottom portion 75 of the pilot case 73 with the cylinder-side end surface thereof. An outer peripheral surface 83 of the pilot body 74 is provided with an annular groove 97 in which a seal ring 98 is mounted. The seal ring 98 seals between the inner peripheral surface 96 of the pilot case 73 and the outer peripheral surface 83 of the pilot body 74 .

A valve chamber 100 of the pilot valve 71 and the fail-safe valve 107 is formed inside the pilot body 74 . A shaft hole 101 is formed in the bottom of the pilot body 74 to introduce the hydraulic fluid introduced from the annular flow path 21 through the introduction orifice 94 into the valve chamber 100 . An annular seat portion 102 is formed on the periphery of the opening of the shaft hole 101 on the side opposite to the cylinder, with which the valve body 103 of the pilot valve 71 abuts in a separable manner.

The valve body 103 is formed in a substantially cylindrical shape and has a tapered end portion on the cylinder side. An outer flange-shaped spring receiving portion 104 is formed on the opposite side of the valve body 103 to the cylinder. The valve element 103 is urged in a direction away from the seat portion 102 (anti-cylinder direction) by a disc-shaped spring 105 . The disk-shaped spring 105 is composed of a single non-linear spring, and a pilot spring and a fail spring are integrally constructed.

A cylindrical portion 84 having an outer diameter larger than that of the outer peripheral surface 83 is provided at the end portion of the pilot body 74 opposite to the cylinder. Inside the cylindrical portion 84, a disk-shaped spring 105, a spacer 111, a fail-safe disk 108, a laminated disk component 112, and a washer 113 are supported. Disk spring 105 , spacer 111 , failsafe disk 108 , laminated disk component 112 and washer 113 are secured to pilot body 74 by cap 115 mounted on cylindrical portion 84 of pilot body 74 .

The cap 115 is provided with a plurality of notches 116 that allow the valve chamber 100 to communicate with the flow path 67 on the outer circumference of the cap 115 . The valve chamber 100 includes a passage 117 formed in the washer 113, a notch 116 of the cap 115, a flow path 67, a passage 65 between the width across flats 89 of the pilot case 73 and the cylindrical portion 123 of the yoke 122, and the valve case 25. It communicates with the reservoir 4 via an annular flow path 66 formed on the inner periphery of the reservoir 4 and the opening 24 .

Pilot case 73 and yoke 122 are coupled by screw coupling portion 119 . As a result, an axial force is applied to the downstream valve parts between the pilot case 73 and the yoke 122, ie, the pilot body 74, the disc spring 105, the spacer 111, the disc part 112, the washer 113, and the cap 115. When the pilot case 73 and the yoke 122 are screwed together, a tool is engaged with the width across flats 89 of the pilot case 73 and the width across flats 138 formed on the outer peripheral surface of the yoke 122 .

A coil 126, a core 127, a core 128, a plunger 129, and a hollow actuation rod 130 are assembled to the yoke 122 on the side opposite to the cylinder. Actuation rod 130 is formed integrally with plunger 129, but may be separate. A valve body 103 of the pilot valve 71 is fixed to the cylinder-side end of the operating rod 130 . A spacer 131 and a cover 132 are inserted into the end of the yoke 122 on the non-cylinder side, and by plastically working the periphery of the yoke 122 on the non-cylinder side, an axial force is applied to the parts inside the solenoid inside the yoke 122. .

The yoke 122 is coupled to the valve case 25 by fitting the cylindrical portion 123 on the cylinder side to the large inner diameter portion 26 of the valve case 25 on the side opposite to the cylinder. The yoke 122 is axially positioned with respect to the valve case 25 by abutting the end surface of the cylindrical portion 123 against the stepped portion 27 of the valve case 25 . An annular groove 133 is formed on the outer peripheral surface of the cylindrical portion 123 . A seal ring 134 for sealing between the valve case 25 and the cylindrical portion 123 of the yoke 122 is mounted in the annular groove 133 . The valve case 25 and the yoke 122 are coupled by tightening the nut 135 screwed to the outer periphery of the valve case 25 and compressing the retaining ring 137 . The space between the valve case 25 and the nut 135 is sealed by a seal ring 29 fitted in the annular groove 28 of the valve case 25 .

Such a shock absorber 1 is provided between a sprung (vehicle body) and unsprung (wheels) of a suspension device (not shown) of a vehicle. In a normal operating state, the vehicle-mounted controller adjusts the valve opening pressure of the pilot valve 71 by controlling the current supplied to the solenoid 121 (coil 126) of the damping force generating mechanism 30. FIG.

During the extension stroke of the piston rod 6, the check valve 13 of the piston 5 closes due to an increase in pressure in the cylinder upper chamber 2A, and before the disk valve 14 opens, the hydraulic fluid in the cylinder upper chamber 2A is added. pressured. The pressurized hydraulic fluid is introduced into the damping force generating mechanism 30 from the branch pipe 23 of the separator tube 20 (connecting pipe) through the passage 22 and the annular flow path 21 . At this time, the hydraulic fluid corresponding to the movement of the piston 5 flows from the reservoir 4 into the cylinder lower chamber 2B by opening the check valve 17 of the base valve 10 . When the pressure in the cylinder upper chamber 2A reaches the opening pressure of the disc valve 14 of the piston 5 and the disc valve 14 opens, the pressure in the cylinder upper chamber 2A is released to the cylinder lower chamber 2B. As a result, an excessive pressure rise in the cylinder upper chamber 2A can be avoided.

During the compression stroke of the piston rod 6, the check valve 13 of the piston 5 opens and the check valve 17 of the passage 15 of the base valve 10 closes due to the pressure increase in the cylinder lower chamber 2B. Before the disk valve 18 opens, the hydraulic fluid in the piston lower chamber 2B flows into the cylinder upper chamber 2A, and the volume of the hydraulic fluid that the piston rod 6 has entered into the cylinder 2 is released from the cylinder upper chamber 2A into the cylinder upper chamber 2A. It is introduced into the damping force generating mechanism 30 via the passage 22 , the annular flow path 21 , and the branch pipe 23 of the separator tube 20 . When the pressure in the cylinder lower chamber 2B reaches the valve opening pressure of the disc valve 18 of the base valve 10 and the disc valve 18 opens, the pressure in the cylinder lower chamber 2B is released to the reservoir 4 . As a result, an excessive pressure rise in the cylinder lower chamber 2B can be avoided.

The hydraulic fluid introduced into the damping force generating mechanism 30 flows through the introduction orifice 94 , the introduction passage 93 , the recess 91 and the passage 92 of the pilot case 73 , and flows into the annular recess 80 . It is introduced into the back pressure chamber 72 through an orifice (not labeled). Before the main valve 51 opens (low piston speed range), the hydraulic fluid introduced into the damping force generating mechanism 30 passes through the introduction orifice 94, the introduction passage 93, the recess 91, and the shaft hole 101 of the pilot body 74. After that, the pilot valve 71 is opened to flow into the valve chamber 100 in the pilot body 74 .

The hydraulic fluid that has flowed into the valve chamber 100 passes through the disk-shaped spring 105, the fail-safe disk 108, the washer 113, the notch 116 of the cap 115, the flow path 67 on the outer periphery of the cap 115, the width across flats 89 of the pilot case 73, and the yoke 112. It flows into the reservoir 4 from the opening 24 via the passage 65 between and the annular flow path 66 on the inner circumference of the valve case 25 . When the piston speed increases and the pressure in the annular recess 55 communicating with the annular flow path 21 via the branch pipe 23 reaches the valve opening pressure of the main valve 51 and the main valve 51 opens, the annular flow path 21 opens. The hydraulic fluid flows into the reservoir 4 through the branch pipe 23 , the passage 59 , the annular recess 55 , the main valve 51 and the opening 24 .

The hydraulic fluid that has flowed into the reservoir 4 from the opening 24 is sealed in the space inside the partition wall portion 33 of the baffle plate 31 (partition wall member). 1). In other words, the baffle plate 31 prevents the hydraulic fluid that has flowed into the reservoir 4 from the opening 24 from moving upward and in the circumferential direction of the separator tube 20 . prevents the jet flow from generating swirls and air bubbles in the vicinity of the liquid surface S of the hydraulic fluid in the reservoir 4 .

As a result, it is possible to prevent the occurrence of aeration due to the agitation of the gas and hydraulic fluid, and obtain a stable damping force. In addition, since the baffle plate 31 mitigates the rapid expansion of the flow path area of the hydraulic fluid flowing into the reservoir 4 from the damping force generating mechanism 30, a rapid increase in the flow velocity of the hydraulic fluid flowing into the reservoir 4 is suppressed. Suppressed. As a result, the generation of vortices is suppressed, and accordingly the generation of cavitation due to the generation of vortices is also suppressed, so that a stable damping force can be obtained.

In this manner, the damping force generating mechanism 30 operates before the opening of the main valve 51 (in the low piston speed range) during the extension stroke and the compression stroke of the piston rod 6. ) is generated by the valve opening pressure, and after the main valve 51 is opened (in the middle piston speed range), the damping force corresponding to the opening of the main valve 51 is generated. By controlling the energization of the solenoid 121 (coil 126) and adjusting the opening pressure of the pilot valve 71, the damping force can be directly controlled regardless of the piston speed. In addition, by controlling the energization of the solenoid 121 and adjusting the valve opening pressure of the pilot valve 71, the hydraulic fluid introduced into the back pressure chamber 72 through the orifice (reference numerals omitted) at the outer peripheral edge of the back pressure introduction valve 81 is controlled. is adjusted, the damping force characteristic can be adjusted over a wide range.

Further, when the thrust of the plunger 129 is lost in the event of a failure such as disconnection of the coil 126 or failure of the in-vehicle controller, the spring force of the disk-shaped spring 105 (fail-safe spring) 143 retracts the valve body 103 . As a result, the pilot valve 71 is opened, and the spring receiving portion 104 of the valve body 103 contacts the fail-safe disk 108, so that the communication between the valve chamber 100 and the annular flow path 66 on the inner periphery of the valve case 25 is interrupted. blocked.

As a result, from the annular flow path 21 , through the introduction orifice 94 , the introduction passage 93 , the recess 91 , the shaft hole 101 , the valve chamber 100 , the notch 116 , the flow path 67 , the passage 65 , the annular flow path 66 , the opening 24 to the reservoir. Hydraulic fluid flow into 4 is controlled by a fail-safe valve 107 . Therefore, by controlling the opening pressure of the fail-safe valve 107, the damping force can be adjusted. At the same time, it is possible to adjust the internal pressure of the back pressure chamber 72 and, by extension, the valve opening pressure of the main valve 51, so that an appropriate damping force can be obtained even when a failure occurs.

Next, the baffle plate 31 (partition member) according to the first embodiment will be described with reference to FIGS. 2 and 3. FIG.
As shown in FIG. 2, a baffle plate 31 is provided inside the reservoir 4 so as to face the opening 24 . The baffle plate 31 controls the direction of flow of hydraulic fluid that flows into the reservoir 4 from the damping force generating mechanism 30 through the opening 24, thereby suppressing aeration that occurs when the hydraulic fluid and gas in the reservoir 4 are agitated. do. The baffle plate 31 is an integrally molded product made of a single material, and is made of a flexible elastic body such as NBR (nitrile rubber).

Referring to FIGS. 2 and 3, the baffle plate 31 has a plate-like base portion 32 having a semicircular upper portion and a rectangular lower portion when viewed from the front (see FIG. 3). The base portion 32 of the baffle plate 31 curves along the outer peripheral surface 68 of the separator tube 20 (connection tube) in the attached state (see FIG. 2). A partition wall portion 33 is provided on the edge of the base portion 32 excluding the lower bottom (lower side), the partition wall portion 33 protruding toward the side opposite to the cylinder and the tip portion of which contacts the inner peripheral surface 69 of the outer cylinder 3 . The partition part 33 is formed to have a substantially trapezoidal cross section and is provided so as to surround the opening 24 . A groove 34 is formed in the inner ridge between the base 32 and the partition wall 33 so that the partition wall 33 can easily fall inward.

At the center of the base portion 32, a cylindrical seal portion 35 is provided that protrudes toward the side opposite to the cylinder and is open at both ends. The seal portion 35 is provided on the outer circumference of the branch pipe 23 and is interposed between the cylindrical portion 56 of the main body 52 and the branch pipe 23 connected (inserted) to the cylindrical portion 56 . The sealing portion 35 is fitted to the outer peripheral surface 70 of the branch pipe 23 of the separator tube 20 with a certain interference by making the inner diameter smaller than the outer diameter of the branch pipe 23 of the separator tube 20 .

An annular outer peripheral lip 36 protrudes radially outward from the seal portion 35 and abuts against an inner peripheral surface 57 of a cylindrical portion 56 of the main body 52 (connecting member) at the opening peripheral edge of the seal portion 35 on the side opposite to the cylinder. be provided. An annular inner peripheral lip 37 that protrudes radially inward from the seal portion 35 and abuts against the outer peripheral surface 70 of the branch pipe 23 is provided at an intermediate portion of the seal portion 35 in the axial direction (“right-and-left direction” in FIG. 2). be done. An annular groove 38 is provided on the ridge between the inner peripheral lip 37 and the inner peripheral surface of the seal portion 35 on the cylinder side. By deforming the cross-sectional shape of the annular groove 38 , the baffle plate 31 can bring the inner peripheral lip 37 into close contact with the outer peripheral surface 70 of the branch pipe 23 .

In the attached state (see FIG. 2 ) of the baffle plate 31 , the reaction force of the outer peripheral lip 36 being pressed against the inner peripheral surface 57 of the cylindrical portion 56 of the main body 52 pushes the inner peripheral lip 37 toward the branch pipe 23 of the separator tube 20 . acts as a pressure on the Similarly, the reaction force with which the inner peripheral lip 37 is pressed against the branch pipe 23 acts to press the outer peripheral lip 36 against the inner peripheral surface 57 of the cylindrical portion 56 . In other words, the seal portion 35 is compressed between the branch pipe 23 of the separator tube 20 (connection pipe) and the cylindrical portion 56 of the main body 52 (connection member), and the seal portion 35 is compressed between the reservoir 4 and the annular flow path 21. Seal liquid tight.

Here, in the conventional shock absorber, when the damping force generating mechanism is connected to the outer periphery of the separator tube (connecting pipe), the branch pipe is fitted (inserted) inside the cylindrical portion of the main body (connecting member). Seal between the barrel and the branch pipe. In this case, since the baffle plate (partition member) in the reservoir cannot be fixed, there is a possibility that the baffle plate may rotate around the branch pipe.

On the other hand, in the first embodiment, the branch pipe 23 of the separator tube 20 (connecting pipe) is connected (inserted) inside the cylindrical portion 56 of the main body 52 (connecting member) of the damping force generating mechanism 30, Between the cylindrical portion 56 and the branch pipe 23, a seal portion 35 of the baffle plate 31 (partition member) fitted to the outer peripheral surface 70 of the branch pipe 23 was interposed.
Then, the outer peripheral lip 36 formed on the seal portion 35 of the baffle plate 31 is brought into contact with the inner peripheral surface 57 of the cylindrical portion 56 of the main body 52, and the inner peripheral lip 37 formed on the seal portion 35 is brought into contact with the separator. Since the tube 20 is brought into contact with the outer peripheral surface 70 of the branch pipe 23 , the flow of hydraulic fluid (fluid pressure leakage) between the annular flow path 21 and the reservoir 4 via the outer periphery of the branch pipe 23 is reliably blocked. .
Further, in the first embodiment, since the sealing portion 35 of the baffle plate 31 is fitted to the outer circumference of the branch pipe 23 of the separator tube 20 with an interference, when the damping force generating mechanism 30 is connected to the outer circumference of the branch pipe 23, , the baffle plate 31 can be firmly fixed inside the reservoir 4 (separator tube 20).
In the first embodiment, the baffle plate 31 (partition wall member) is made of a single material, but the baffle plate can be made by baking rubber on a thin metal plate, for example.

(Second embodiment)
Next, a second embodiment will be described with reference to FIG. Here, differences from the first embodiment will be described. Note that the same designations and reference numerals are used for common parts with the first embodiment, and redundant explanations are omitted.

In the first embodiment, the partition wall portion 33 that controls the flow of hydraulic fluid that flows into the reservoir 4 from the damping force generating mechanism 30 through the opening 24, the main body 52 (connecting member) of the damping force generating mechanism 30, and the separator A baffle plate 31 (partition wall member) is configured by providing a cylindrical seal portion 35 for sealing between the tube 20 (connection tube) and the outer periphery of the branch tube 23 in a single member that is not separated.

On the other hand, in the second embodiment, the baffle plate 41 (partition member) is divided into a plate-like first member 42 having a partition wall portion 33 and an annular second member 45 having a seal portion 46. Configured. In other words, the partition wall portion 33 is separated from the seal portion 46 . The second member 45 has a seal portion 46 and a flange portion 47 . The flange portion 47 is provided at the cylinder-side end edge of the cylindrical seal portion 46 and protrudes radially outward.

The second member 45 is baked and fixed to the outer circumference of the separator tube 20 (branch pipe 23 ) in a state where the cylindrical seal portion 46 is fitted to the outer circumference of the branch pipe 23 . The side opposite to the cylinder (the side opposite to the flange portion 46 ) of the second member 45 protrudes radially outward and contacts the inner peripheral surface 57 of the cylindrical portion 56 of the main body 52 of the damping force generating mechanism 30 . A peripheral lip 36 is provided.

The base portion 32 of the first member 42 is provided with a fitting hole 43 into which the outer periphery of the flange portion 47 of the second member 45 is fitted. By fitting the flange portion 47 into the fitting hole 43 , the first member 42 can be positioned within the reservoir 4 . The inner diameter of the fitting hole 43 is smaller than the outer diameter of the flange portion 46 . As a result, the flange portion 47 is fitted into the fitting hole 47 with an interference, so that the joint portion between the first member 42 and the second member 45 can be reinforced. In addition, the plate thickness of the opening peripheral portion of the fitting hole 43 is thicker toward the counter-cylinder side than the plate thickness of the base portion 32 (about the same as the plate thickness of the flange portion 47 of the second member 45).

According to 2nd Embodiment, the effect equivalent to the effect of 1st Embodiment mentioned above can be obtained.
In addition, in the second embodiment, since the sealing portion 46 of the baffle plate 41 (partition wall member) is baked and fixed to the outer circumference of the branch pipe 23 of the separator tube 20 (connecting pipe), the rigidity of the sealing portion 46 is improved. It is easy to connect (insert) the damping force generating mechanism 30 to the outer circumference of the branch pipe 23, and the ease of assembly can be improved.

1 shock absorber, 2 cylinder, 3 outer cylinder, 4 reservoir, 5 piston, 20 separator tube (connecting pipe), 24 opening, 30 damping force generating mechanism, 31 baffle plate (partition member), 33 partition part, 35 cylindrical part ( seal part), 52 main body (connection member)

Claims (3)

a cylinder filled with hydraulic fluid;
a piston that is inserted into the cylinder and defines the inside of the cylinder into two chambers;
an outer cylinder provided on the outer periphery of the cylinder;
a reservoir formed between the cylinder and the outer cylinder and containing the hydraulic fluid and gas;
a connecting pipe provided between the cylinder and the outer cylinder and communicating with the inside of the cylinder;
a damping force generating mechanism having a connection member connected to the outer periphery of the connection pipe;
a valve case provided outside the outer cylinder and accommodating the damping force generating mechanism;
an opening provided in the outer cylinder for circulating hydraulic fluid from the damping force generating mechanism to the reservoir through the outside of the connection pipe;
a partition wall member provided in the reservoir and having a partition wall portion for controlling a flow direction of hydraulic fluid that flows into the reservoir from the damping force generating mechanism through the opening;
A shock absorber, wherein the partition member has a seal portion that seals between the connection pipe and the connection member. 2. The shock absorber according to claim 1, wherein the seal portion is made of a material having flexibility and is fitted to the outer periphery of the connection pipe with interference. 3. The shock absorber according to claim 1, wherein the partition member is composed of a first member in which the partition is formed and a second member in which the seal is formed.

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