JP4825723B2 - Vehicle damping force variable damper - Google Patents

Description

  The present invention relates to a vehicular damping force variable damper capable of changing a damping force of a damper by opening and closing a valve disposed in a flow path with a magnetic attraction force by an electromagnetic solenoid.

2. Description of the Related Art As a vehicle damping force variable damper, a piston is provided with a port, oil flowing through the port is circulated, and a damping force is generated by resistance when the oil circulates.
In general, the damping force variable damper of a practical vehicle changes the damping force by changing the flow rate of oil flowing through the port.

As such a vehicle damping force variable damper, there is known one in which a port is appropriately opened and closed by using an electromagnet to change the damping force of the damper (see, for example, Patent Document 1).
Japanese Examined Patent Publication No. 1-47323 (page 5, Fig. 4)

The technique of Patent Document 1 will be described.
FIG. 8 is a diagram for explaining a basic configuration of a conventional damping force variable damper.
The conventional damping force variable damper 200 includes a cylindrical cylinder 201, a piston 202 slidably attached to the cylinder 201, and damper oil (not shown) that flows in the cylinder 201 through a port 203 of the piston 202. ), One end attached to the piston 202, the other end protruding outside the cylinder 201 via a rod guide (not shown), and the piston 202 attached coaxially to one end of the rod 206, the port 203, A valve 208 that opens and closes 203 and an electromagnetic solenoid (electromagnet) 209 that is provided on the piston 202 and drives the valve 208 are configured.

However, in the damping force variable damper 200 of the vehicle, since the valve 208 is coaxially attached to the piston 202, the distance from the support portion (fulcrum) 211 of the piston 202 to the opening / closing portions (force points) 212 and 212 of the port 203. Can not earn enough. Therefore, it is difficult to set the movement of the valve 208 to a flexible movement. In other words, since the rigidity of the valve 208 is high, a force is often required to open and close. For this reason, the response speed of the valve 208 was slow, and the valve 208 could not be controlled appropriately.
Further, since the rigidity of the valve 208 is high, the durability of the valve 208 is also difficult.

  The present invention can sufficiently obtain a distance from a support part (fulcrum) supported by a piston to an opening / closing part (power point) that closes or opens a port, and reduces the opening / closing force of the valve to provide a highly responsive valve. It is an object of the present invention to provide a variable damping force damper for a vehicle including the above.

The invention according to claim 1 controls a cylindrical cylinder, a piston slidably attached to the cylinder and partitioning the cylinder into two chambers, and a damper oil attached to the piston and flowing in the two chambers. In the vehicular damping force variable damper provided with a solenoid valve and an electromagnetic solenoid provided on the piston and driving the valve, the valve is an elastic material and has a circular shape having a diameter substantially equal to the diameter of the piston . An open / close part that opens and closes the port of the piston, a support part that supports the open / close part so as to be openable and closable, and an arcuate shape that is opened along a substantially outer diameter on a circular plate. A slit, an annular part provided on the outer part of the circular plate and fixed to the piston, an inner tongue part provided on the inner part of the circular plate, and a rod attached to the piston A rod through hole that is larger than the outer diameter of the penetrating portion and formed with a gap between the rod penetrating portion and the support portion is a continuous portion of the inner tongue portion and the annular portion. The opening / closing part and the support part are arranged on both sides of a straight line passing through the center of the piston in the circumferential direction and parallel to the support part, and an electromagnetic solenoid for driving the valve is connected to the extension stroke of the damper. And the damper's contraction stroke are respectively arranged inside the piston exclusively .

According to a second aspect of the present invention, the piston has a port that allows the damper oil to flow in, and the valve has an oil outflow hole that allows the damper oil to flow when the port is opened. An oil inflow hole, which is formed on the opening / closing part side and allows the inflow of damper oil, is formed on the support side across the straight line, and when viewed from the axial direction of the piston, the oil outflow hole and port on the opening / closing part side are The oil outlet hole and the port on the support portion side are arranged at substantially the same position, and are arranged at positions shifted from each other .

The invention according to claim 3 is characterized in that the valves are arranged at both ends of the piston and open and close dedicated ports respectively in the extension stroke of the damper and the contraction stroke of the damper.

In the first aspect of the invention, the electromagnetic solenoid is energized (energized) / de-energized (non-energized) to close or open the valve and control the damper oil to control the damping force of the damper. The valve is an elastic material formed on a circular plate having a diameter substantially the same as the diameter of the piston, and an opening / closing portion for opening / closing the piston port and a support for opening / closing the opening / closing portion. Part, an arc-shaped slit opened along the outer diameter of the circular plate, an annular part provided on the outer part of the circular plate and fixed to the piston, and an inner part of the circular plate And a rod through hole formed so as to have a gap between the inner diameter of the inner tongue and the outer diameter of the portion through which the rod attached to the piston penetrates, and the portion through which the rod penetrates. The support portion is formed in a continuous portion of the inner tongue portion and the annular portion, and the opening and closing portion and the support portion are disposed on both sides of a straight line passing through the center of the piston in the circumferential direction and parallel to the support portion. It is disposed, electromagnetic Sole for driving the valve The id, so arranged in the interior of the piston to a dedicated respectively for the extension stroke and damper compression stroke of the damper, make set longer distance (span) between the closing part (point of force) and the supporting part (fulcrum) (fully )be able to. As a result, the durability of the valve can be improved, and a valve with good responsiveness can be realized by reducing the opening / closing force. As a result, it is possible to satisfactorily control the damping force of the variable damping force damper of the vehicle.
Furthermore, since the distance between the opening / closing part (power point) and the support part (fulcrum) can be set long and the opening / closing force can be reduced, the power of the electromagnetic solenoid can be reduced. As a result, it is possible to realize energy saving of the variable damping force damper of the vehicle.

In the invention according to claim 2, the piston has a port that allows the inflow of damper oil, and the valve has an oil outflow hole that allows the damper oil to flow out when the port is opened. An oil inflow hole, which is formed on the opening / closing part side and allows the inflow of damper oil, is formed on the support side across the straight line, and when viewed from the axial direction of the piston, the oil outflow hole and port on the opening / closing part side are The oil outflow holes and the ports on the support part side were arranged at substantially the same positions.

In the invention according to claim 3 , the valves are arranged at both ends of the piston, and the dedicated ports are opened and closed in the extension stroke of the damper and the contraction stroke of the damper, respectively. For example, the extension stroke of the damper and the damper The characteristics of each valve can be set by the contraction stroke. As a result, the damper characteristics can be changed between the extension stroke of the damper and the contraction stroke of the damper.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a cross-sectional view of a damper unit employing a variable damping force damper for a vehicle according to the present invention.
The damper unit 10 includes a damping force variable damper (shock absorber) 20 and a coil spring 12.

  The damping force variable damper 20 is slidably attached to the cylindrical cylinder 21, the piston 22 that divides the cylinder 21 into two chambers, and attached to the piston 22 from one end of the cylinder 21. The rod 24 protruding through the rod guide 23 and the cylinder 21 are sealed, and flow through the two chambers (upper chamber / lower chamber) 25 and 26 via the ports 75 and 76 (see FIG. 2) of the piston 22. The lower end is fixed to a suspension arm (not shown), and the upper end is fixed to the vehicle body side via an upper mount 40.

2 is an enlarged view of part 2 of FIG. 1, FIG. 3 is a view taken along line 3-3 in FIG. 2, and FIG. 4 is a view taken along line 4-4 in FIG.
As shown in FIGS. 2 to 4, the piston peripheral structure 50 includes the rod 24 and upper and lower pressing members 51 and 52, upper and lower ring members 53 and 54, and upper and lower portions on the step portion 63 of the rod 24. And the piston 22 attached with a nut 58 via a collar member 57.

  The rod 24 includes a rod main body 61, a small diameter portion 62 having a smaller diameter than the rod main body 61, a step 63 formed at the root of the small diameter portion 62 to which the piston 22 is attached, and a tip of the small diameter portion 62. In order to guide the male screw part 64 into which the nut 58 is screwed, the lead wire 74 of the electromagnetic solenoid 73 to the outside, the lead guide hole 65 opened in the axial direction and the lead wire 74 of the electromagnetic solenoid 73 are guided to the inside. For this purpose, the lead guide hole 65 includes a lead introduction hole 66 opened from the radial direction and a cap 67 that closes the tip of the lead guide hole 65.

The piston 22 is attached to the step portion 63 of the rod 24, and is attached to the piston main body 71 formed of a magnetic material and the outer peripheral portion 71a of the piston main body 71, and slides on the inner peripheral portion 21a of the cylinder 21 and the damper. A seal member 72 that seals the oil 27, an electromagnetic solenoid (electromagnet) 73 that is attached to the piston main body 71 and drives the upper and lower valves 55 and 56, and the piston main body 71, and allows the damper oil 27 to flow in. Ports 75 and 76.
The electromagnetic solenoid 73 includes a lead wire 74.

  The upper pressing member 51 includes a through hole 81 that penetrates the step portion 63 of the rod 24, a flange portion 82 that is formed around the through hole 81 and fits into the step portion 63 of the rod 24, and an upper valve 55. A pressing portion 83 that presses the annular portion 92 against the piston main body 71 and a plurality of fluid holes 84 that promote the flow of the damper oil 27 are provided.

  The lower pressing member 52 has substantially the same structure as the upper pressing member, and has a through hole 85 that penetrates the step portion 63 of the rod 24, and a flange portion 86 that is formed around the through hole 85 and that faces the collar member 57. , A pressing portion 87 that presses the annular portion 102 of the lower valve 56 against the piston main body 71, and a plurality of fluid holes 88 that promote the flow of the damper oil 27.

The upper ring member 53 is a washer formed of an elastic member interposed between the annular portion 92 of the upper valve 55 and the pressing portion 83 of the upper pressing member 51.
The lower ring member 54 has the same structure as the upper ring member 53 and is a washer interposed between the annular portion 102 of the lower valve 56 and the pressing portion 87 of the lower pressing member 52.

As shown in FIG. 3, the upper valve 55 is made of a magnetic material and an elastic material, and a circular plate 91 having an arc-shaped slit 91 extending along the outer diameter is opened. An annular portion 92 fixed to the piston main body 71 is formed on the outer portion of the shaped plate, an inner tongue portion 93 is formed on the inner portion of the circular plate, and a continuous portion between the inner tongue portion 93 and the annular portion 92 is formed. A support portion (hinge) 94 is formed.
The opening / closing part 95 and the support part 94 are arranged on both sides of the straight line C1 across a straight line C1 passing through the diameter of the piston 22.

  The inner tongue portion 93 is formed to be larger than the opening / closing portion 95 for opening and closing the port 75, the outer diameter of the rod 24, the rod through hole 96 through which the rod 24 passes, and the damper oil 27 when the port 75 is opened. Oil outflow holes 97 and 97 that allow the flow and an oil inflow hole 98 that is opened along the port 75 and allows the damper oil 27 to flow into the port 76 are formed.

The opening / closing part 95 is a part to which a partial area of the inner tongue part 93 is allocated at a position corresponding to the port 75.
The oil outflow holes 97 and 97 and the port 75 are in a positional relationship shifted from each other in plan view, and the oil inflow hole 98 and the port 75 are in substantially the same positional relationship in plan view.

  The upper valve 55 is formed in a state where the annular portion 92, the inner tongue portion 93, and the support portion 94 are connected. Thereby, even when the slit 91 is provided, the magnetic path of the electromagnetic solenoid 73 can be connected, and the electromagnetic solenoid 73 can obtain a sufficient attractive force.

As shown in FIG. 4, the lower valve 56 is made of the same material and structure as the upper valve 55, and has an arcuate slit 101, an annular portion 102, an inner tongue portion 103, and a support portion (hinge). 104 is formed.
The opening / closing part 105 and the support part 104 are arranged on both sides of the straight line C1 across a straight line C1 passing through the diameter of the piston 22.

  The inner tongue 103 is opened along the opening / closing portion 105, the rod through hole 106, the oil outflow holes 107 and 107 that allow the damper oil 27 to flow when the port 76 is opened, and the port 76. An oil inflow hole 108 that allows the damper oil 27 to flow into 75 is formed.

The opening / closing part 105 is a part to which a partial area of the inner tongue part 103 is allocated at a position corresponding to the port 76.
The oil outflow holes 107, 107 and the port 76 are in a positional relationship shifted from each other in plan view, and the oil inflow hole 108 and the port 76 are in substantially the same positional relationship in plan view.

Returning to FIG. 2, the collar member 57 passes through the small diameter portion 62 of the rod 24 and is fitted into the through hole 85 of the lower pressing member 52.
The nut 58 is screwed into a male screw portion 64 formed at the tip of the small diameter portion 62.

  In the variable damping force damper 20 of the vehicle, the solenoid 55 is energized (energized) / de-energized (non-energized) to close or open the valve 55 and control the damper oil 27 to control the damping force of the damper. The valve 55 includes an opening / closing portion 95 that opens and closes the port 75 of the piston 22 and a support portion 94 that supports the opening / closing portion 95 so that the opening / closing portion 95 can be opened and closed. The opening and closing portion 95 and the support portion 94 pass through the diameter of the piston 22. By arranging the straight line on both sides of the straight line, the distance (span) between the opening / closing part (power point) 95 and the support part (fulcrum) 94 can be set long (sufficiently earned). Thereby, the durability of the valve 55 can be improved, and the valve 55 having good responsiveness can be realized by reducing the opening / closing force. As a result, the damping force of the vehicle damping force variable damper 20 can be controlled satisfactorily.

  Furthermore, since the distance between the opening / closing part (power point) 95 and the support part (fulcrum) 94 can be set long and the opening / closing force can be reduced, the power of the electromagnetic solenoid 73 can be reduced. As a result, the energy saving of the variable damping force damper 20 of the vehicle can be realized.

  Since the valve 55 is formed of a circular plate having substantially the same diameter as the piston 22, the valve 55 can be set to the maximum dimension. As a result, the durability of the valve 55 can be further improved, and a valve with good responsiveness can be realized by reducing the opening / closing force.

The valve 55 is formed of an elastic plate (plate), and a plurality of the plates are laminated. An arc-shaped slit 91 is formed on the circular plate along the substantially outer diameter so that the circular plate is formed. An annular portion 92 fixed to the piston 22 is formed on the outer portion, an inner tongue portion 93 is formed on the inner portion of the circular plate, and an opening / closing portion 95 for opening and closing the port 75 of the piston 22 is formed on the inner tongue portion 93. Thus, it can be said that the support portion 94 of the opening / closing portion 95 is formed at the continuous portion of the inner tongue portion 93 and the annular portion 92.
As a result, the valve 55 can have a simple structure, and the cost of the variable damping force damper 20 of the vehicle can be reduced.

FIGS. 5A and 5B are operation explanatory views for explaining the case where the piston of the variable damping force damper of the vehicle shown in FIG. 1 receives a downward movement force (shrinking stroke of the damper). (A) shows the state of the valve 55 when the electromagnetic solenoid 73 is not energized (de-energized), and (b) shows the state of the valve 55 when the electromagnetic solenoid 73 is energized (excited).
In (a), when the piston 22 receives a force to move downward as indicated by the arrow a1, the damper oil 27 tends to move from the lower chamber 26 to the upper chamber 25 via the port 75. Since the electromagnetic solenoid 73 is not energized, the opening / closing part 95 of the upper valve 55 is opened by the pressure of the damper oil 27, and the damper oil 27 passes through the gap S1 generated between the piston body 71 and the opening / closing part 95, It can move from the lower chamber 26 to the upper chamber 25 as indicated by an arrow a2.

  Similarly, in (b), when the piston 22 receives a force that moves downward as indicated by the arrow b1, the solenoid 53 is energized, so that the upper tongue 55 of the upper valve 55 is connected to the piston main body 71. It is adsorbed and closed, and movement from the lower chamber 26 to the upper chamber 25 of the damper oil 27 is prevented as indicated by the arrow b2. The inner tongue 103 of the lower valve 56 is also attracted to the piston body 71 at the same time.

  Further, a closed loop is formed in the magnetic path as indicated by arrows b3 and b4 by the piston main body 71 and the upper and lower valves 55 and 56 in the electromagnetic solenoid 73, and the electromagnetic solenoid 73 can obtain a sufficient attractive force.

FIGS. 6A and 6B are operation explanatory views for explaining the case where the piston of the variable damping force damper of the vehicle shown in FIG. 1 receives a force for moving upward (the extension stroke of the damper). (A) shows the state of the valve 56 when the electromagnetic solenoid 73 is not energized (de-energized), and (b) shows the state of the valve 56 when the electromagnetic solenoid 73 is energized (excited).
In (a), when the piston 22 receives a force to move upward as indicated by an arrow a4, the damper oil 27 tends to move from the upper chamber 25 to the lower chamber 26 via the port 76. Since the electromagnetic solenoid 73 is not energized, the opening / closing part 105 of the lower valve 56 is opened by the pressure of the damper oil 27, and the damper oil 27 passes through the gap S2 generated between the piston body 71 and the opening / closing part 105, It can move from the upper chamber 25 to the lower chamber 26 as indicated by an arrow a5.

  Similarly, in (b), when the piston 22 receives a force to move upward as indicated by the arrow b6, the electromagnetic solenoid 73 is energized, so that the lower valve 56 has the inner tongue 103 on the piston body 71. It is adsorbed and closed, and movement from the upper chamber 25 to the lower chamber 26 of the damper oil 27 is prevented as indicated by an arrow b7. The inner tongue portion 93 of the upper valve 55 is also attracted to the piston body 71 at the same time.

  Further, the electromagnetic solenoid 73 is formed with a closed loop in the magnetic path as indicated by arrows b8 and b9 by the piston main body 71 and the upper and lower valves 55 and 56, so that the electromagnetic solenoid 73 can obtain a sufficient attractive force.

  5 and 6, the variable damping force damper 20 of the vehicle has valves 55 and 56 arranged at both ends of the piston 22, and each has a dedicated extension (pull) stroke of the damper and a contraction (push) stroke of the damper. It can be said that the ports 75 and 76 are opened and closed. Thereby, for example, the characteristics of the valves 55 and 56 can be set in the extension stroke of the damper and the contraction stroke of the damper. Specifically, the characteristics of the valves 55 and 56 can be changed by changing the number of laminated elastic plates and the thickness of the elastic plates. As a result, the damper characteristics can be changed between the extension stroke of the damper and the contraction stroke of the damper.

FIG. 7 is a sectional view of a variable damping force damper for a vehicle according to a second embodiment of the present invention.
Like the damping force variable damper 20 (see FIG. 2), the damping force variable damper 120 is slidably attached to the cylindrical cylinder 121 and a piston that divides the cylinder 121 into two chambers. 122, a rod 124 attached to the piston 122 and projecting from one end of the cylinder 121 via a rod guide (not shown), and sealed in the cylinder 121, and connected to two chambers (upper chamber via ports 175 and 176). The lower chamber is composed of damper oil 127 that flows through 125 and 126, and has a lower end fixed to a suspension arm (not shown) and an upper end fixed to the vehicle body side via an upper mount (not shown).

  The piston 122 is supported by the piston main body 171 attached to the male threaded portion 164 of the rod 124 and the step 163 of the rod 124 via the upper pressing member 151 to open and close the port 175 dedicated to the contraction stroke. A valve 155, an electromagnetic solenoid (electromagnet) 177 that is provided on the piston main body 171 and drives the upper valve 155, and is fixed to the piston main body 171 with a bolt 167 via a lower pressing member 152, and a port 176 dedicated to the extension stroke is provided. A lower valve 156 that opens and closes, an electromagnetic solenoid (electromagnet) 178 that is provided on the piston main body 171 and drives the lower valve 156, and is attached to the piston main body 171 and slides on the inner peripheral portion 121a of the cylinder 121 and a damper. And a seal member 172 that seals the oil 127.

The upper and lower valves 155 and 156 are members having the same configuration as the upper and lower valves 55 and 56 (see FIGS. 3 and 4).
The ports 175 and 176 are provided in the piston main body 171. As described above, the port 175 is a dedicated port through which the damper oil 127 flows in the contraction stroke of the damper, and the port 176 is the damper oil in the expansion stroke of the damper. 127 is a dedicated port for flow.
The electromagnetic solenoid 177 is a dedicated member that drives the upper valve 155, and the electromagnetic solenoid 178 is a dedicated member that drives the lower valve 156.

  The upper pressing member 151 includes a through hole 181 that penetrates the step portion 163 of the rod 124 and a plurality of fluid holes 184 that facilitate the circulation of the damper oil 127, and the lower pressing member 152 includes a through hole 185 that allows the bolt 167 to pass therethrough. And a plurality of fluid holes 188 that facilitate the circulation of the damper oil 127.

In the damper contraction stroke, the damper oil 127 flows from the lower chamber 126 to the upper chamber 125 as indicated by an arrow c1. At this time, by driving the upper valve 155 with the electromagnetic solenoid 177, the damper characteristic is controlled in the contraction stroke.
In the extension stroke of the damper, the damper oil 127 flows from the upper chamber 125 to the lower chamber 126 as indicated by an arrow d1. At this time, by driving the lower valve 156 with the electromagnetic solenoid 178, the damper characteristic is controlled in the contraction stroke.

  That is, in the damping force variable damper 120, the electromagnetic solenoids 177 and 178 for driving the valves 155 and 156 are arranged inside the piston 122 (in the piston main body 171) exclusively for the extension stroke and the damper compression stroke, respectively. It has been done. Therefore, precise control can be performed at the time of switching between both strokes of the extension stroke of the damper and the contraction stroke of the damper.

  In the vehicle damping force variable damper 20 according to the present invention, as shown in FIG. 3, the upper valve 55 is a member formed of a plate-like magnetic body and an elastic material, and is a circular plate. However, the slit is not limited to this, and the slit may have a polygonal shape, and a portion supported by the piston body and a portion for opening and closing the port are provided. Anything can be used.

  The vehicle damping force variable damper according to the present invention is suitable for use in passenger cars such as sedans and wagons.

It is sectional drawing of the damper unit which employ | adopted the damping force variable damper of the vehicle which concerns on this invention. FIG. 2 is an enlarged view of part 2 of FIG. 1. FIG. 3 is a view taken along line 3-3 in FIG. 2. FIG. 4 is a view taken along line 4-4 in FIG. 2. FIG. 2 is an operation explanatory diagram for explaining a case where a piston of the variable damping force damper of the vehicle shown in FIG. 1 receives a downward movement force (shrinking stroke of the damper). FIG. 3 is an operation explanatory diagram for explaining a case where a piston of the variable damping force damper of the vehicle shown in FIG. 1 receives a force that moves upward (an extension stroke of the damper). It is sectional drawing of the damping force variable damper of the vehicle of 2nd Example which concerns on this invention. It is a figure explaining the basic composition of the conventional damping force variable damper.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 20 ... Damping force variable damper, 21 ... Cylinder, 22 ... Piston, 25, 26 ... Upper / lower chamber, 27 ... Damper oil, 55, 56 ... Upper / lower valve, 73 ... Electromagnetic solenoid, 75, 76 ... Port 91, 101 ... slit, 92, 102 ... annular part, 93, 103 ... inner tongue part, 94 ... support part (hinge), 95, 105 ... opening / closing part, 120 ... damper with variable damping force, 122 ... piston, 155 156, upper and lower valves, 177, 178 ... electromagnetic solenoids.

Claims (3)

A cylindrical cylinder, a piston that is slidably attached to the cylinder, divides the cylinder into two chambers, a valve that is attached to the piston and controls damper oil flowing in the two chambers, and a piston In the vehicle damping force variable damper having the electromagnetic solenoid that drives the valve,
The valve is an elastic material and is formed on a circular plate having a diameter substantially the same as the diameter of the piston, and an opening / closing portion for opening and closing the port of the piston, and the opening / closing portion can be freely opened and closed. A support portion for supporting, an arc-shaped slit opened along the outer diameter of the circular plate, an annular portion provided on an outer portion of the circular plate and fixed to the piston, Formed to have a gap between the inner tongue provided in the inner part of the circular plate and the outer diameter of the part through which the rod attached to the piston penetrates, and the part through which the rod penetrates A rod through hole, and
The support part is formed in a continuous part of the inner tongue part and the annular part,
The opening and closing part and the support part are arranged on both sides across a straight line passing through the center in the circumferential direction of the piston and parallel to the support part ,
A variable damping force damper for a vehicle, characterized in that an electromagnetic solenoid for driving the valve is disposed inside the piston exclusively for an extension stroke of the damper and a contraction stroke of the damper. The piston has a port that allows inflow of damper oil;
In the valve, an oil outflow hole that allows the damper oil to flow out when the port is opened is formed on the opening / closing part side across the straight line, and an oil inflow hole that allows the damper oil to flow in Is formed on the support side across the straight line,
When viewed from the axial direction of the piston, the oil outlet hole on the opening / closing part side and the port are arranged at positions shifted from each other, and the oil outlet hole on the support part side and the port are substantially at the same position. The damper according to claim 1, wherein the damper is a variable damping force type damper. The variable valve damping force type vehicle according to claim 1 or 2, wherein the valves are arranged at both ends of the piston and open and close dedicated ports respectively in an extension stroke of the damper and a contraction stroke of the damper. damper.

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