Poppet valve device and hydraulic vibration isolator using the same

Abstract

To provide a hydraulic vibration isolator having a poppet valve, which comprises a safety function for preventing damage due to overload, and can be easily replaced with an existing product without increasing the size of the existing product.SOLUTION: A poppet valve device 9 comprises a valve case 11, a valve body 13 that opens and closes a valve seat 11a opening into the valve case 11, and a spring 14 that biases the valve body 13 in an opening direction. The valve case 11 comprises: a flange part 11b that is housed in an outer case 10 communicating with an oil passage 8, slidably penetrates a relief valve seat 10a that opens into the outer case 10 to branch off and merge with the oil passage 8, and abuts against the opening peripheral edge of the relief valve seat 10a; and a relief oil passage 11c formed between a side part and an inner wall of the outer case 10 by cutting out a side part. The valve case 11 is biased by a spring 12 in a direction of closing the relief valve seat 10a. In the poppet valve device 9, excessive oil pressure causes the flange part 11b of the valve case 11 to separate from a valve seat 10a of the outer case 10, and the oil pressure is released through the relief oil passage 11c.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a poppet valve device used in hydraulic equipment such as a hydraulic vibration isolator, and to a hydraulic vibration isolator using the same. [Background technology]

[0002] Conventionally, there is a hydraulic vibration isolator (see, for example, Patent Document 1) in which oil reservoirs connected to both ends of a hydraulic cylinder adjust the amount of oil in the cylinder when the piston moves, based on the difference in cross-sectional area between the two hydraulic chambers partitioned by the piston inside the hydraulic cylinder, and perform vibration isolation by closing the oil passage to restrain the movement of the piston when the piston rod is attempted to move in and out suddenly, while a poppet valve is provided in the bypass circuit to allow slow movement of the piston due to thermal displacement of the supported body, etc. Another bypass circuit is provided in parallel with the bypass circuit, and a relief valve is provided in this separate bypass circuit, so that when an unexpected overload is applied to the hydraulic vibration isolator, the poppet valve opens to release hydraulic oil and prevent the overload that would lead to damage from being imposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 62-106040 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional hydraulic vibration isolators described above, the poppet valve that performs the vibration isolation function and the poppet valve that performs the relief valve function are constructed separately, so the increased number of parts hinders the overall size reduction and may restrict the installation location. Therefore, the present invention aims to provide a poppet valve device and a hydraulic vibration isolator using the same that add a safety function to prevent damage due to overload without increasing the size of the existing vibration isolator and make it easy to replace the existing part. [Means for solving the problem]

[0005] The present invention configures a poppet valve device 9 by including a valve case 11 communicating with an oil passage 8, and a valve element 13 housed in the valve case 11, facing a valve seat 11a opening into the valve case 11 so as to be able to open and close the oil passage 8, being biased in an opening direction, and closing the oil passage 8 when a predetermined oil pressure rises. The valve case 11 faces a relief valve seat 10a opening into a relief oil passage 11c that branches off and joins the oil passage 8 so as to be able to open and close, and is biased in a closing direction to close the relief oil passage 11c, but is also provided with a relief mechanism that opens the release oil passage 11c when a predetermined oil pressure exceeds the oil pressure at which the valve element 13 performs a closing operation. The hydraulic vibration damper 1 is also constructed by a cylinder 2 having a closing lid 2a at one end connected to either the supporting body or the supported body and an opening lid 2b at the other end through which a piston rod 4 passes, a piston 3 that is inserted axially into the cylinder 2 so as to be airtight and slidable, and has a piston rod 4 that passes through the opening lid 2b and is connected to the other of the supporting body or the supported body, and an oil passage 8 that communicates with both hydraulic chambers 5, 6 of the cylinder 2 separated by the piston 3, and the poppet valve device 9 is provided in the middle of the oil passage 8. [Effects of the Invention]

[0006] According to the poppet valve device of the present invention, the poppet valve and relief valve, which perform the vibration-damping function, are constructed as a single unit, which promotes miniaturization by reducing the number of parts, makes it easy to replace existing parts, and increases the freedom of installation location, allowing the vibration-damping function to be effectively utilized. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a front view of a hydraulic vibration isolator according to the present invention. [Figure 2] 1 is a vertical cross-sectional view of a poppet valve device according to the present invention in an open state. [Figure 3] FIG. 3 is a view taken along the line III in FIG. 2. [Figure 4] FIG. 3 is a vertical cross-sectional view of the poppet valve device of FIG. 2 in a closed state. [Figure 5]FIG. 3 is a vertical cross-sectional view of the poppet valve device of FIG. 2 in a relief state. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described with reference to the drawings. 1, hydraulic vibration isolator 1 comprises a cylinder 2 with a closing lid 2a at one end and an opening lid 2b at the other end, a piston 3 inserted into cylinder 2 to airtightly divide the interior into first and second hydraulic chambers 5 and 6, a piston rod 4 extending outward from this piston 3 passing through the opening lid 2b of cylinder 2, an oil reservoir 7 communicating with the hydraulic chambers 5 and 6 in cylinder 2 through an oil passage 8, and poppet valve devices 9 and 9 provided in the oil passage 8 leading from the hydraulic chambers 5 and 6 to the oil reservoir 7 via the closing lid 2a and the opening lid 2b. In hydraulic vibration isolator 1, the closing lid 2a of cylinder 2 is connected to one of a support body such as a structure (not shown) or a supported body that is the object of vibration isolation, and the outer end of the piston rod 4 is connected to the other end.

[0009] When the piston 3 moves toward the hydraulic chamber 5 (leftward in FIG. 1), an excess of hydraulic oil corresponding to the volume of the piston rod 4 entering the hydraulic chamber 6 occurs in the oil reservoir 7, while when the piston 3 moves in the opposite direction, a shortage of hydraulic oil corresponding to the volume of the piston rod 4 leaving the hydraulic chamber 6 occurs. However, the flow of hydraulic oil in and out absorbs the excess and shortage of hydraulic oil into and out of the cylinder 2. The oil reservoir 7 also absorbs changes in the volume of hydraulic oil due to temperature changes.

[0010] The poppet valve device 9 has the function of closing the oil passage 8 in response to a sudden increase in oil pressure, while allowing a gradual increase in oil pressure to keep the oil passage 8 open, and is also provided with a relief mechanism that prevents damage from excessive oil pressure. That is, the poppet valve device 9 includes an outer case 10 that communicates with the oil passage 8, a valve case 11 that opens into the outer case 10 and opens and closes a relief valve seat 10a that communicates with the oil passage, a spring 12 that urges the valve case 11 in the direction of closing the relief valve seat 10a, a valve element 13 that faces the valve seat 11a that opens into the valve case 11 and can be opened and closed, and a spring 14 that urges the valve element 13 in the opening direction. The valve case 11 is provided with a flange 11b that slidably penetrates the relief valve seat 10a of the outer case 10 and abuts against the periphery of the relief valve seat 10a, and a parallel relief oil passage 11c that is formed between the inner wall of the outer case 10 and cut out from the cylindrical side portion and branches off from and joins the oil passage 8 in the axial direction. The relief oil passage 11c is opened and closed by the flange 11b, which is a relief valve body portion, moving toward and away from the relief valve seat 10a of the outer case 10. The outer case 10, the relief valve seat 10a, the relief oil passage 11c, and the flange 11b form a relief mechanism.

[0011] In this hydraulic vibration isolator 1, when the supported object attempts to move suddenly relative to the support due to an earthquake or the like, a predetermined oil pressure rises suddenly in the cylinder 2 due to movement of the piston 3, causing the valve element 13 to close the oil passage 8 and prevent the relative movement of the supported object. On the other hand, when the supported object moves slowly relative to the support due to thermal displacement or the like, the valve element 13 allows a slow increase in oil pressure in the oil passage 8, keeping the oil passage 8 open and allowing the slow relative movement of the supported object. However, when the supported object attempts to move relative to the supporting object due to an earthquake or the like, if excessive oil pressure is applied to the valve body 13 compared to the previous sudden oil pressure, the valve case 11 opens the relief valve seat 10a of the outer case 10, and releases the oil pressure to the oil reservoir 7 side through the relief oil passage 11c, preventing excessive load from being applied to the hydraulic vibration damper 1. [Explanation of symbols]

[0012] 1 Hydraulic vibration isolator 2 cylinders 2a closing lid 2b Opening lid 3 pistons 4 piston rod 5 Hydraulic chamber 6 Hydraulic chamber 7 Oil Reservoir 8 Oil passage 9 Poppet valve device 10 Outer case 10a Relief valve seat 11 Valve case 11a Valve seat 11b Tsubabe 11c Relief oil passage 12 Spring 13 Valve body 14 Spring

Claims

1. a valve case communicating with an oil passage; and a valve element accommodated in the valve case, facing a valve seat opening into the valve case so as to be able to open and close the oil passage, and biased in an opening direction so as to close the oil passage when a predetermined oil pressure rises. The valve case faces a relief valve seat that opens into a relief oil passage that branches off and merges with the oil passage and is biased in the closing direction to close the relief oil passage, and is equipped with a relief mechanism that opens a release oil passage with a predetermined oil pressure that is greater than the oil pressure at which the valve body performs the closing operation.

2. a cylinder having at one end a closing lid connected to one of a supporting body or a supported body and at the other end an opening lid through which a piston rod passes; a piston that is slidably inserted in the axial direction of the cylinder in an airtight manner and has the piston rod that passes through the opening lid and is connected to the other of the supporting body or the supported body; and an oil reservoir that communicates with both hydraulic chambers of the cylinder defined by the piston through an oil passage and is connected to the middle of this oil passage via the poppet valve device according to claim 1, and that adjusts the amount of oil in the cylinder when the piston moves based on the difference in cross-sectional areas of the both hydraulic chambers of the cylinder, A hydraulic vibration damper characterized in that when the piston attempts to move suddenly, the valve body closes the oil passage to restrain the movement of the piston, thereby providing vibration damping, while when the piston moves slowly, the valve body remains open to allow the movement, but the relief mechanism opens when the specified excessive oil pressure is reached.

3. The relief mechanism includes an outer case that communicates with the oil passage and that houses the valve case while forming the relief oil passage between the outer case and the valve case; 3. The poppet valve device according to claim 1 or the hydraulic vibration damper according to claim 2, further comprising a relief valve body portion of the valve case that faces the relief valve seat so as to be able to open and close and is biased in a direction to close the relief oil passage.

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