JP5737960B2 - Liquid damper device - Google Patents

Description

  The present invention relates to a liquid damper device that absorbs energy and the like of heavy objects in operations of a printing machine, an automobile conveyance line, an assembly robot, and the like.

  Conventionally, there is a liquid damper device shown in FIG. 3 similar to that described in Patent Document 1. FIG. 3 is a cross-sectional view of the liquid damper device.

  As shown in FIG. 3, the liquid damper device 100 includes an outer cylinder 101 and an inner cylinder 105 that is supported in the outer cylinder 101 and that forms a liquid reflux path 103 between the inner peripheral surface of the outer cylinder 101. .

  A piston 107 is disposed in the inner cylinder 105 so as to be capable of reciprocating. One end of an operating rod 109 is coupled to the piston 107, and the other end of the operating rod 109 protrudes outside the outer cylinder 101.

  One end of the inner cylinder 105 is closed by an end closing member 111. An orifice 113 is formed in the end closing member 111. The orifice 113 has an opening 115 opposite to the piston 107 at one end, the other end communicates with the liquid reflux path 103, and can be controlled to reduce the passage area by external adjustment.

  The inner cylinder 105 is provided with a plurality of through holes 117a, 117b, 117c, and 117d at predetermined intervals in the moving direction of the piston 107. The through holes 117 a, 117 b, 117 c, and 117 d allow the inside of the inner cylinder 105 to communicate with the liquid reflux path 103.

  A working liquid is sealed in the outer cylinder 101 and the inner cylinder 105.

  Therefore, when the actuating rod 109 receives an impact force, the piston 107 moves together with the actuating rod 109, and the working liquid in the inner cylinder 105 flows back to the liquid reflux path 103 through the through holes 117a, 117b, 117c, 117d and the orifice 113. . This recirculation eliminates the recirculation from the through holes 117a, 117b, 117c, and 117d in accordance with the movement of the piston 107, so that the impact applied to the operating rod 109 can be reduced.

  In addition, the degree of impact relaxation can be controlled by adjusting the passage area of the orifice 113 from the outside.

  However, even if the recirculation from all the through holes 117a, 117b, 117c, and 117d disappears due to the movement of the piston 107, the orifice 113 is opened to the end, so that the piston 107 cannot be stopped by the liquid flow resistance by the orifice 113, In some cases, the piston 107 collides with the end closing member 111.

  In particular, there is a high possibility that the piston 107 collides with the end closing member 111 in response to a heavy impact of a heavy object.

JP-A-5-288235

  The problem to be solved is that the piston may collide with the end closing member.

In order to suppress the piston from colliding with the end closing member, the present invention is supported in the outer cylinder and the outer cylinder, and an inner cylinder in which a liquid reflux path is formed between the inner peripheral surface of the outer cylinder, A piston disposed in the inner cylinder so as to be capable of reciprocating; an operating rod having one end coupled to the piston and the other end projecting out of the outer cylinder; and an end closing member that closes one end of the inner cylinder; And an orifice that is formed in the end closing member and communicates with an opening facing the piston to the liquid reflux path, and the piston moves so that the working liquid in the inner cylinder passes through the orifice to the liquid reflux path. A shock absorber that relieves the impact applied to the operating rod by recirculating, wherein the piston is elastically supported by a movable closing member capable of abutting and closing the opening, and the opening is moved by the movement of the piston. Closed with a closing member Characterized in that to said end closure site material to be to generate a liquid lock between the piston and the inner cylinder.

  Since this invention is the said structure, when a piston approaches an end closing member, a movable closing member can elastically contact an opening and can contact and close an opening.

  Therefore, the orifice is closed and a liquid lock is generated, and the piston is smoothly stopped by a slight liquid leakage between the piston and the inner cylinder, and the collision to the end closing member side can be prevented or suppressed.

It is sectional drawing of a liquid damper apparatus. Example 1 It is the A section expanded sectional view of FIG. Example 1 It is sectional drawing of a liquid damper apparatus. (Conventional example)

  The purpose of enabling the piston to be prevented from colliding with the end closing member is realized by elastically supporting a movable closing member capable of abutting and closing the opening.

[Overall configuration of liquid damper device]
FIG. 1 is a cross-sectional view of a liquid damper device.

  As shown in FIG. 1, the liquid damper device 1 includes an outer cylinder 3 and an inner cylinder 5. The inner cylinder 5 is supported in the outer cylinder 3 and forms a liquid reflux path 7 between the inner cylinder 5 and the inner peripheral surface of the outer cylinder 3. A piston 9 is disposed in the inner cylinder 5 so as to be able to reciprocate. One end of an operating rod 11 is coupled to the piston 9, and the other end of the operating rod 11 projects out of the outer cylinder 3.

  One end of the inner cylinder 5 is closed by an end closing member 13. An orifice 15 is formed in the end closing member 13. The orifice 15 has a mortar-shaped opening 17 facing the piston 9 at one end, the other end communicates with the liquid reflux path 7, and the passage area can be reduced by external adjustment.

  More specifically, the outer cylinder 3 includes an end wall 19 at one end, a holder 23 is positioned on the inner side by a retaining ring 21 on the other end, and a spring seat 25 is positioned on the outer side. A support hole 27 is formed in the end wall 19, and a set screw 29 is attached around the support hole 27. A closing ball 33 is inserted into the injection hole 31 that allows the liquid reflux path 7 to communicate with the outside, and is fixed by a screw 34. The oil to be described later is injected into the inside through the injection hole 31.

  The inner cylinder 5 is provided with a plurality of through holes 35a, 35b, 35c, and 35d at predetermined intervals in the moving direction of the piston 9. The through holes 35 a, 35 b, 35 c, and 35 d communicate the inner cylinder 5 with the liquid reflux path 7. At the other end of the inner cylinder 5, a slit 7a for liquid circulation is formed.

  On the piston 9 side, a movable closing pin 37 which is a movable closing member capable of contacting and closing the opening 17 is elastically supported. The structure around the movable closing pin 37 will be described later with reference to FIG. A plurality of piston orifices 39 are formed on the piston 9, and a valve body 41 is attached to the piston 9.

  A spring seat 43 is fixed to the outer end of the operating rod 11 with a bolt 45, and a return spring 47 is interposed between the spring seats 43 and 25.

  The end closing member 13 includes a rotating part 49 and a fixed part 51.

  The rotating part 49 includes an operation shaft part 53 and a body part 55. The operation shaft portion 53 is fitted into the support hole 27, and a groove 57 for inserting a driver or the like is formed at the outer end of the operation shaft portion 53. Close. The body portion 55 is provided with a first partial orifice 59. The first partial orifice 59 has the opening 17 at one end and an adjustment port 61 opened to the outer peripheral surface of the body 55 at the other end.

  The fixing portion 51 includes a seat portion 63 and is formed in a hollow shape. The inner peripheral surface of the fixed portion 51 is fitted to the outer peripheral surface of the body portion 55, and the outer peripheral surface of the fixed portion 51 is fitted into one end portion of the inner cylinder 5. An O-ring 65 is attached to the outer peripheral surface of the fixed portion 51 and is in close contact with the inner peripheral surface of the inner cylinder 5. The seat 63 abuts against the end wall 19 of the outer cylinder 3, and the set screw 29 is engaged with the positioning hole 67 of the seat to prevent rotation. The fixed portion 51 is provided with a second partial orifice 69. The second partial orifice 69 has one end facing the adjustment port 61 and the other end opened to the liquid reflux path 7 to form the orifice 15 together with the first partial orifice 59.

The holder 23 is fitted and disposed in the outer cylinder 3, a rod guide hole 71 and a seal holding portion 73 are formed on the inner periphery, and the operating rod 11 is fitted in the rod guide guide 71. The seal holder 73 holds a seal 75 and is in close contact with the outer surface of the operating rod 11. A flow hole 77 is formed on the piston 9 side of the holder 23, and an accumulator holding portion 79 is provided on the outer peripheral side. An accumulator 81 such as rubber is attached to the accumulator holding portion 79.
[Structure around closing pin]
FIG. 2 is an enlarged cross-sectional view of a part A in FIG.

  As shown in FIG. 2, a pin support hole 83 for the movable closing pin 37 is formed on the piston 9 side. The pin support hole 83 is formed across the operating rod 11 in this embodiment. The pin support hole 83 includes a female female thread portion 85 extending from the piston 9 to the operating rod 11 and a spring accommodating hole 87 having a smaller diameter than the female thread portion 85 on the back side of the female thread portion 85. A pin guide 89 is attached to the female thread portion 85 by screwing. The flange portion 89 a of the pin guide 89 holds the inner edge of the valve body 41.

  A movable closing pin 37 is supported on the pin guide 89 so as to be able to appear and retract. The enlarged diameter portion 37 a of the movable closing pin 37 is formed with a smaller diameter than the spring accommodating hole 87. A spring 91 is accommodated in the spring accommodating hole 87 as an elastic member and is in contact with the enlarged diameter portion 37 a of the movable closing pin 37. Therefore, the movable closing pin 37 is supported so as to be retractable inside the pin support hole 83 against the elastic force via the spring 91 which is an elastic member.

  An escape passage 93 is provided in the movable closing pin 37. The escape passage 93 is a groove formed in the axial direction on the outer peripheral surface of the movable closing pin 37, and becomes a hole in the enlarged diameter portion 37 a and penetrates the inside of the spring accommodating hole 87. The pin support hole 83 communicates with the inside of the inner cylinder 5 by the escape passage 93.

  The escape passage 93 can be formed on the inner peripheral surface of the pin guide 89 on the pin support hole 83 side, or can be formed on both the movable closing pin 37 and the pin guide 89.

In the outer cylinder 3 and the inner cylinder 5, mineral oil-based oil is sealed as a working liquid.
[Shock absorption]
The liquid damper device 1 absorbs energy of heavy objects in operations of a printing machine, an automobile conveyance line, an assembly robot, and the like. In a printing machine, it is attached to a printing roll, controls the position of the paper, and contributes to preventing equipment damage during test printing. In the car transport line, energy is absorbed when the assembly car body transport speed is reduced, thereby contributing to equipment protection. The assembly robot absorbs energy by overrunning the slide mechanism to prevent equipment damage.
That is, when the actuating rod 11 receives an impact force, the piston 9 moves together with the actuating rod 11, the valve body 41 moves under the pressure of the oil, and the piston orifice 39 is closed.

  Accordingly, the oil in the inner cylinder 5 receives pressure as the piston 9 moves, and flows back to the liquid reflux path 7 through the through holes 35a, 35b, 35c, 35d and the orifice 15.

  When oil returns to the liquid reflux path 7, the oil in the liquid reflux path 7 moves to the accumulator 81 side through the slit 7 a of the inner cylinder 5 and the flow hole 77 of the holder 23.

  Then, according to the movement of the piston 9, the reflux from the through holes 35a, 35b, 35c, and 35d is sequentially eliminated, and the impact applied to the operating rod 11 can be reduced.

  The rotating portion 49 of the end closing member 13 is rotated from the outside, and the flow passage resistance of the orifice 15 is adjusted by adjusting the overlapping passage area between the adjusting port 61 of the first partial orifice 59 and the second partial orifice 69. And the degree of impact relaxation can be externally controlled.

  After the recirculation from all of the through holes 35a, 35b, 35c, and 35d is eliminated by the movement of the piston 9, the movable closing pin 37 elastically contacts the opening 17 of the orifice 15 to close the opening 17.

  When the piston 9 further moves, the movable closing pin 37 moves to the inside of the pin support hole 83 against the elastic force of the spring 91, and an oil lock is generated between the piston 9 and the inner cylinder 5. At this time, with a slight oil leak between the piston 9 and the inner cylinder 5, the piston 9 is gently stopped and the collision with the end closing member 13 is avoided.

  When the operating rod 11 receives no force, the operating rod 11 is pulled out by the return spring 47, and the movable closing pin 37 opens the opening 17 by the movement of the piston 9 accompanying this. Further, the valve body 41 also returns to move so as to open the piston / orifice 39, and oil flows through the piston / orifice 39.

  By the return movement of the piston 9 at this time, the oil returns from the liquid reflux path 7 through the through holes 35a, 35b, 35c, 35d and the orifice 15 into the inner cylinder 5. Oil returns to the liquid reflux path 7 from the accumulator 81 through the flow hole 77 and the slit 7a.

Therefore, the operating rod 11 can quickly extend.
[Effect of Example 1]
The first embodiment of the present invention includes an outer cylinder 3, an inner cylinder 5 that is supported in the outer cylinder 3 and that forms a liquid reflux path 7 between the inner cylinder 5 and a reciprocating motion in the inner cylinder 5. A piston 9 which can be disposed; an operating rod 11 having one end coupled to the piston 9 and the other end projecting out of the outer cylinder 3; an end closing member 13 for closing one end of the inner cylinder 3; An orifice 15 formed in the closing member 13 and communicating with the liquid reflux path 7 through an opening 17 facing the piston 9 is provided. The piston 9 moves and oil in the inner cylinder 5 passes through the orifice 15 and returns to the liquid reflux path 7. Thus, the shock absorber 1 for reducing the impact applied to the actuating rod 11 is elastically supported on the piston 9 side by a movable closing pin 37 that can contact and close the opening 17.

  For this reason, when the piston 9 approaches the end closing member 13, the movable closing pin 37 can be brought into elastic contact with the opening 17 to close and close the opening 17.

  Therefore, the orifice 15 is closed and a liquid lock is generated, and the piston 9 can be smoothly stopped by a slight oil leak between the piston 9 and the inner cylinder 5, and the collision with the end closing member 13 can be suppressed.

  A pin support hole 83 of the movable closing pin 37 is formed on the piston 9 side, and the movable closing pin 37 is supported by a spring 91 so as to be retractable inside the pin support hole 83 against an elastic force.

  Therefore, the movable closing pin 37 can be reliably brought into elastic contact with the opening 17 by the movement of the piston 9.

  The movable closing pin 37 is provided with an escape passage 93 that allows the pin support hole 83 to communicate with the inside of the inner cylinder 5.

  For this reason, when the movable closing pin 37 elastically contacts the opening 17 and retreats to the inside of the pin support hole 83, the oil is not discharged from the escape passage 93 to the inside of the inner cylinder 5 and is not confined, so that the operation of the movable closing pin 37 is performed. Can be performed smoothly.

  The inner cylinder 5 was provided with a plurality of through holes 35a, 35b, 35c, 35d at predetermined intervals in the moving direction of the piston 9.

  For this reason, according to the movement of the piston 9, the reflux from the through holes 35a, 35b, 35c, and 35d is sequentially eliminated, and the impact applied to the operating rod 11 by the flow resistance can be reduced.

  The end closing member 13 includes a rotating portion 49 that can be rotated from the outside and a fixing portion 51 that is fitted to the outer periphery of the rotating portion 49 and is fixed to the inner cylinder 5 side. The rotating portion 49 has an opening 17 at one end. And a first partial orifice 59 having an adjustment port 61 opened on the outer peripheral surface of the rotating portion 49 at the other end. The fixed portion 51 has one end facing the adjustment port 61 and the other end connected to the liquid reflux path 7. A second partial orifice 69 is provided which is open and forms an orifice 15 together with a first partial orifice 59.

For this reason, the rotation part 49 of the end closing member 13 is rotated from the outside, and the degree of impact relaxation can be externally controlled.
[Others]
The through holes 35a, 35b, 35c, and 35d can be omitted. Orifice 15 can also be of an unadjustable type.

DESCRIPTION OF SYMBOLS 1 Liquid damper apparatus 3 Outer cylinder 5 Liquid return path 9 Piston 11 Actuating rod 13 End closing member 15 Orifice 17 Opening 35a, 35b, 35c, 35d Through-hole 37 Movable closing pin (movable closing member)
49 Rotating portion 51 Fixed portion 59 First partial orifice 61 Adjustment port 69 Second partial orifice 83 Pin support hole 93 Escape passage

Claims (5)

An outer cylinder and an inner cylinder that is supported in the outer cylinder and forms a liquid reflux path between the inner peripheral surface of the outer cylinder;
A piston arranged to reciprocate in the inner cylinder;
An operating rod having one end coupled to the piston and the other end protruding outside the outer cylinder;
An end closing member that closes one end of the inner cylinder;
An orifice that is formed in the end closing member and that communicates with the liquid reflux path through an opening facing the piston;
A shock absorber that relieves shock applied to the operating rod by moving the piston and returning the working liquid in the inner cylinder to the liquid reflux path through the orifice;
On the piston side, a movable closing member capable of abutting and closing the opening is elastically supported,
When the opening is closed by the movable closing member by the movement of the piston, a liquid lock is generated between the piston and the inner cylinder with respect to the end closing member .
A liquid damper device. The liquid damper device according to claim 1,
The movable closing member is a movable closing pin,
Forming a pin support hole for the movable closing pin on the piston side;
The movable closing pin is supported so as to be retractable inside the pin support hole against an elastic force via an elastic member.
A liquid damper device. The liquid damper device according to claim 2,
At least one of the movable closing pin and the pin support hole is provided with a relief passage for communicating the pin support hole and the inside of the inner cylinder.
A liquid damper device. The liquid damper device according to any one of claims 1 to 3,
The inner cylinder includes a plurality of through holes that communicate the interior of the inner cylinder with the liquid reflux path at predetermined intervals in the moving direction of the piston.
A liquid damper device. The liquid damper device according to any one of claims 1 to 4,
The end closing member includes a rotating part that can be rotated from the outside and a fixed part that is fitted to the outer periphery of the rotating part and fixed to the inner cylinder side,
The rotating part is provided with a first partial orifice having the opening at one end and an adjustment port opened on the outer peripheral surface of the rotating part at the other end,
The fixed portion is provided with a second partial orifice having one end opposed to the adjustment port and the other end opened to the liquid reflux path to form the orifice together with the first partial orifice.
A liquid damper device.

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