JP6018138B2 - Oil tank and hydraulic damper - Google Patents

Description

  The present invention relates to an oil tank for a hydraulic damper and a hydraulic damper having the oil tank.

  A TMD (Tuned Mass Damper) is used as a vibration control device that attenuates shaking of a building structure. As a structure of TMD, one having a weight suspended by an arm on the top floor of a structure is known (for example, see Patent Document 1).

JP 2011-27136 A

  The hydraulic damper includes a cylindrical cylinder and a piston rod that protrudes and protrudes from the cylinder, and hydraulic oil is sealed in the cylinder. An oil tank for a hydraulic damper includes a tank body that stores hydraulic oil in communication with a cylinder.

  By the way, in an oil tank in which the upper part of the tank body communicates with the atmosphere, if a large amount of hydraulic oil suddenly flows out of the tank body, the oil level near the communication port communicating with the cylinder will partially decrease greatly, and the communication port will open to the atmosphere. There is a risk that air may be sent to the hydraulic damper (cylinder) side together with the hydraulic oil in direct communication with the side.

When air flows into the hydraulic damper (cylinder) side, the damping capacity (attenuation capacity) of the hydraulic damper is reduced.
An object of this invention is to suppress that air is sent to a hydraulic damper (cylinder) side with hydraulic oil in view of the said point.

  In order to achieve the above object, the present invention is applied to a hydraulic damper (1) having a piston rod (5) protruding and retracting from a cylindrical cylinder (3), and hydraulic oil entering and exiting from the cylinder (3) enters and exits. A tank body (71) that stores hydraulic oil and has at least one communication port (71A) that communicates the inside of the cylinder (3) and the tank body (71). And an air release part (72) communicating with the atmosphere side in the tank main body (71) on the upper side in the vertical direction from the communication port (71A), and communication with the air release part (72) in the tank body (71). A shroud (73) provided between the mouth (71A) and covering the upper side in the vertical direction of the communication port (71A) is provided.

  Thereby, in this invention, since it can suppress that a communicating port (71A) communicates with the atmosphere side directly, it can suppress that air is sent to a hydraulic damper (cylinder) side with hydraulic oil. As a result, it is possible to suppress a reduction in the damping capacity (damping capacity) of the hydraulic damper.

  Incidentally, the reference numerals in parentheses for each of the above means are examples showing the correspondence with the specific means described in the embodiments described later, and the present invention is indicated by the reference numerals in the parentheses of the above respective means. It is not limited to specific means.

(A) And (b) is a conceptual diagram of the seismic control apparatus using TMD. 1 is a top view of a hydraulic damper 1 according to an embodiment of the present invention. 1 is a side view of a hydraulic damper 1 according to an embodiment of the present invention. The oil tank 7 is shown as a cross-sectional view. It is A arrow directional view of FIG. It is sectional drawing of the oil tank 7 which concerns on 1st Embodiment of this invention. It is a top view of the oil tank 7 which concerns on 1st Embodiment of this invention. 1 is a hydraulic circuit diagram of a hydraulic damper 1 according to an embodiment of the present invention. (A)-(d) is a figure which shows the division member 74 which concerns on 2nd Embodiment of this invention.

  The “embodiment of the invention” described below shows an example of the embodiment. In other words, the invention specific items described in the claims are not limited to the specific means and structures shown in the following embodiments.

  In the present embodiment, the present invention is applied to a hydraulic damper for a vibration control device using TMD. As shown in FIG. 1A and FIG. 1B, the plurality of hydraulic dampers 1 connect the suspended weight W and the structure. Thereby, the swing of the weight W is attenuated by each hydraulic damper 1.

  In addition, the arrow etc. which show the direction attached | subjected to each figure are described in order to make it easy to understand the relationship between each figure. The present invention is not limited to the directions given in the drawings. At least one member or part described with at least a reference numeral is provided, except where “plurality”, “two or more”, and the like are omitted. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1. Schematic Configuration of Hydraulic Damper As shown in FIGS. 2 and 3, the hydraulic damper 1 includes a cylinder 3, a piston rod 5, at least one oil tank 7, and the like. The cylinder 3 is a cylindrical member filled with hydraulic oil so that it can enter and exit. The piston rod 5 appears and disappears from the cylinder 3. The piston rod 5 is projected and retracted only from one end side in the axial direction of the cylinder 3.

  The opening on the one end side in the axial direction of the cylinder 3 is liquid-tightly sealed by a packing (not shown) that is in sliding contact with the outer peripheral surface of the piston rod 5. The other axial end opening of the cylinder 3 is closed by a lid 5A.

  Of the end portions in the longitudinal direction of the lid 5A and the piston rod 5, the portion exposed to the outside of the cylinder 3 is connected to a structure or a weight W through a joint 5B. The joint 5B is configured by a joint that can swing three-dimensionally, such as a universal joint.

  The oil tank 7 is an oil storage portion into which hydraulic oil that enters and exits from the cylinder 3 enters and exits, and is integrated with the cylinder 3. In the present embodiment, two oil tanks 7 are provided, and the two oil tanks 7 are arranged on both sides of the cylinder 3 in the radial direction of the cylinder 3 so as to face each other as shown in FIG. It is installed.

The “radial direction”, that is, the direction in which the pair of oil tanks 7 face each other coincides with the substantially horizontal direction when the hydraulic damper 1 is assembled to the vibration damping device.
2. 2. Structure of oil tank and the like 2.1 Oil tank The pair of oil tanks 7 have the same structure. As shown in FIG. 5, the oil tank 7 includes a tank body 71, an air release portion 72, a shroud 73, and the like. The tank body 71 is an oil storage part that stores hydraulic oil. The tank body 71 is provided with at least one communication port 71A that allows the inside of the cylinder 3 and the tank body 71 to communicate with each other.

  In the present embodiment, the communication port 71A includes a first communication port 71B provided on one side in the horizontal direction and a second communication port 71C provided on the other side in the horizontal direction. Hereinafter, the first communication port 71B and the second communication port 71C are collectively referred to as a communication port 71A.

  The first communication port 71B and the second communication port 71C are separated in the horizontal direction. The first communication port 71B communicates with one end in the longitudinal direction of the cylinder 3 through the pipe L1, and the second communication port 71C communicates with the other end in the longitudinal direction of the cylinder 3 through the pipe L2. Yes.

  In the tank body 71, an atmosphere opening portion 72 that communicates with the inside of the tank body 71 and the atmosphere side is provided above the communication port 71 </ b> A in the vertical direction. A partition member 74 is provided on the upper side in the vertical direction from the communication port 71A.

  The partition member 74 partitions the inside of the tank body 71 into a plurality of spaces A1 to A5 arranged in the horizontal direction. The plurality of spaces A <b> 1 to A <b> 5 formed by the partition member 74 communicate with each other on the lower side of the tank body 71 as shown in FIG. 5.

  In the present embodiment, a plurality of atmosphere opening portions 72 are provided. The atmosphere opening portions 72 communicate the spaces A1, A2, A4, and A5 partitioned by the partition member 74 with the atmosphere side. As shown in FIG. 6, each atmosphere opening portion 72 communicates with the atmosphere on the cylinder 3 side. The pair of oil tanks 7 communicate with each other in the space A3 via the communication pipe 75.

  As shown in FIG. 5, the shroud 73 covers the upper side in the vertical direction of the communication port 71 </ b> A. The shroud 73 is provided in the tank body 71 between the atmosphere opening portion 72 and the communication port 71 </ b> A and below the partition member 74.

  The shroud 73 according to the present embodiment is configured by a partition member 73A that partitions the inside of the tank body 71 in the vertical direction and covers the upper side in the vertical direction of the communication port 71A. The partition member 73A is provided with an opening 73B that allows the upper spaces A1 to A5 and the lower space A6 to communicate with each other with the partition member 73A interposed therebetween. The opening 73B is provided at an intermediate position between the first communication port 71B and the second communication port 71C.

2.2 Schematic operation of hydraulic damper The first communication port 71B communicates with one end in the longitudinal direction of the cylinder 3 via a pipe L1. The second communication port 71C communicates with the other end in the longitudinal direction of the cylinder 3 through the pipe L2. The pipes L1 and L2 are provided with valve devices 9C to 9D (see FIG. 7) that generate a flow resistance in the flowing hydraulic oil to generate a damping force. Each of the valve devices 9C to 9D is assembled and fixed to the end portion side of the cylinder 3 in the longitudinal direction.

When the piston rod 5 appears and disappears with respect to the cylinder 3, the hydraulic oil is circulated as follows.
That is, when the hydraulic oil flows into the tank body 71 from the first communication port 71B, the hydraulic oil flows out of the tank body 71 from the second communication port 71C. When the hydraulic oil flows into the tank main body 71 from the second communication port 71C, the hydraulic oil flows out of the tank main body 71 from the first communication port 71B.

  When the hydraulic oil flows between the cylinder 3 and the oil tank 7, a damping force is generated in each of the valve devices 9C to 9D, so that the piston rod 5 is suppressed from appearing and protruding and the amplitude of the weight W is attenuated. I will do it.

3. Features of Oil Tank According to this Embodiment This embodiment is characterized in that a shroud 73 that covers the upper side in the vertical direction of the communication port 71A is provided. Thereby, it can suppress that 71 A of communicating ports communicate with the atmosphere side directly.

  Therefore, in this embodiment, since it can suppress that air is sent with hydraulic oil to the hydraulic damper 1 (cylinder 3) side, it can suppress that the damping capability of the hydraulic damper 1 falls.

  This embodiment is characterized in that the shroud 73 is configured by a partition member 73A having an opening 73B. Thereby, it can suppress reliably that 71 A of communicating ports communicate with the atmosphere side directly.

  In the present embodiment, as the communication port 71A, the first communication port 71B is provided on one side in the horizontal direction, and the second communication port 71C is provided on the other side in the horizontal direction. The second communication port 71C is spaced apart in the horizontal direction, the first communication port 71B communicates with one end in the longitudinal direction of the cylinder 3, and the second communication port 71C communicates with the other longitudinal end of the cylinder 3. Furthermore, the opening 73B is provided at an intermediate position between the first communication port 71B and the second communication port 71C.

  Accordingly, as described above, when the hydraulic oil flows into the tank body 71 from the first communication port 71B, the hydraulic oil flows out of the tank body 71 from the second communication port 71C. Similarly, when the hydraulic oil flows into the tank main body 71 from the second communication port 71C, the hydraulic oil flows out of the tank main body 71 from the first communication port 71B.

  For this reason, since it can suppress that the quantity of the hydraulic fluid stored in the tank main body 71 reduces significantly, it can suppress that an oil level falls significantly. Therefore, it can suppress reliably that air is sent to the hydraulic damper 1 (cylinder 3) side with hydraulic oil.

  In the present embodiment, a partition member 74 that partitions the tank body 71 into a plurality of spaces A1 to A5 arranged in the horizontal direction is provided, and the plurality of spaces A1 to A5 formed by the partition member 74 are on the lower side. It is characterized by communication with each other.

  Thereby, even if the tank main body 71 is swung, it is possible to suppress the oil surface from greatly undulating, so that air is prevented from being sent to the hydraulic damper 1 (cylinder 3) side together with the hydraulic oil. The hydraulic fluid can be prevented from flowing out from the atmosphere opening portion 72 to the outside.

(Second Embodiment)
The partition member 74 according to the first embodiment partitions the inside of the tank body 71 into a plurality of rectangular spaces arranged in a line in the horizontal direction.

  However, in the present embodiment, as shown in FIGS. 8A to 8D, a plurality of spaces arranged in a plurality of rows in the tank body 71 in the horizontal direction, or one in the tank body 71 in the horizontal direction. A partition member 74 is provided for partitioning into a plurality of deformed spaces arranged in a row. Note that. The “irregular space” refers to a shape other than a rectangular shape as shown in FIGS. 8B to 8D.

(Other embodiments)
Although the oil tank 7 according to the above-described embodiment includes the shroud 73 and the partition member 74, the present invention is not limited to this, and the oil includes only one of the shroud 73 and the partition member 74. The tank 7 may be used.

  Although the shroud 73 according to the above-described embodiment is configured by the partition member 73A, the present invention is not limited to this, for example, without completely partitioning the tank body 71 in the vertical direction. The shroud 73 may be configured by a member that covers the upper side in the vertical direction of the communication port 71A.

  Although one opening 73B of the partition member 73A according to the above-described embodiment is provided at an intermediate position between the first communication port 71B and the second communication port 71C, the present invention is not limited to this. For example, the partition member 73A may be configured as a punch metal having a plurality of openings 73B. In this case, it is desirable not to provide the opening 73B near the communication port 71A.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 ... Hydraulic damper 3 ... Cylinder 5 ... Piston rod 5A ... Lid 5B ... Joint 7 ... Oil tank 71 ... Tank main body 71A ... Communication port 71B ... First communication port 71C ... Second communication port 72 ... Air release part 73 ... Shroud 73A ... Partition member 73B ... Opening 74 ... Partition member 75 ... Communication pipe L1, L2 ... Piping

Claims (5)

In an oil tank that is applied to a hydraulic damper having a piston rod protruding and retracting from a cylindrical cylinder, and hydraulic oil entering and exiting from the cylinder is entered and exited,
A tank body for storing the hydraulic oil, the tank body having at least one communication port for communicating the inside of the cylinder and the tank body;
An atmosphere opening portion communicating with the inside of the tank body and the atmosphere side on the upper side in the vertical direction from the communication port;
A shroud provided between the air opening portion and the communication port in the tank body, and covering a vertical upper side of the communication port ;
The shroud is a partition member that partitions the inside of the tank body in the vertical direction and covers the upper side in the vertical direction of the communication port, and opens the upper space and the lower space with the partition member interposed therebetween. A partition member having a portion,
The communication port has a first communication port provided on one side in the horizontal direction and a second communication port provided on the other side in the horizontal direction, and the first communication port and the second communication port are horizontal. Separated in direction,
The first communication port communicates with one end in the longitudinal direction of the cylinder, and the second communication port communicates with the other end in the longitudinal direction of the cylinder;
Furthermore, the opening is an oil tank, characterized that you have provided at a position between said first communication port and the second communication port. A partition member that is provided vertically above the shroud and that partitions the tank body into a plurality of spaces arranged in a horizontal direction;
The oil tank according to claim 1, wherein the plurality of spaces formed by the partition members communicate with each other on a lower side. A cylindrical cylinder filled with hydraulic oil so that it can enter and exit;
A piston rod that appears and disappears from the cylinder;
A hydraulic damper comprising: at least one oil tank integrated with the cylinder, wherein the oil tank according to claim 1 or 2 is provided. The hydraulic damper according to claim 3 , wherein the piston rod protrudes and protrudes only from one end side in the axial direction of the cylinder. Wherein the oil tank and having two, the two oil tanks, hydraulic damper according to claim 3 or 4, characterized in that it is arranged on both sides of the cylinder in a radial direction of the cylinder.