JP4381774B2 - Gasket and multiple valve provided with gasket - Google Patents

Description

  The present invention relates to a multiple valve including a gasket in which a plurality of valves each having a fluid passage communicated with each other is provided and a gasket is disposed between each connection surface of the valves, and adjacent valves in the multiple valves. The present invention relates to a gasket disposed between connecting surfaces.

  Conventionally, in a multiple valve in which a plurality of valves each having a fluid passage communicating with each other are connected, a gasket is disposed between the connection surfaces of the adjacent valves so that fluid leaks from between the connection surfaces. What is prevented is known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 3-189487 (page 3, FIG. 1, FIG. 2)

  However, when the gasket described in Patent Document 1 is applied between the connection surfaces of a valve, the application target is a high-pressure working fluid such as a valve for a construction machine (for a construction machine valve). In some cases, high pressure oil of about 25 MPa is often used), and there is a concern that the working fluid may leak. In particular, in the vicinity of the passage through which the high-pressure fluid flows, the high-pressure fluid leaks between the gasket and the connection surface of the valve, and the working fluid may reach the outside and leak while spreading between the gasket and the connection surface of the valve.

In the multiple valve, a plurality of valves are connected and fixed to each other by bolts and nuts. If the tightening torque at the time of connecting and assembling is high, the valve will be deformed and cause malfunction, so the tightening torque is limited to a predetermined value. In such, the gasket is disposed between the connection surfaces is conceivable to provide a bead to prevent leakage of the working fluid, but the bead is often in the tightening torque of the predetermined value, the bead sufficiently Therefore, the desired sealing force cannot be obtained and the fluid may leak to the outside.

  In view of the above circumstances, the present invention can reduce fluid leakage even when the working fluid is in a high pressure state when a gasket is disposed between the connection surfaces of a plurality of valves having fluid passages communicating with each other. Objective.

Means and effects for solving the problems

  In order to achieve the above object, a multiple valve comprising a gasket of the present invention is a multiple valve in which a plurality of valves each having fluid passages communicated with each other is provided, and adjacent valves in the plurality of valves. Gaskets are respectively disposed between the connection surfaces of the valve, and the gasket has a low-pressure passage hole provided at a position facing the low-pressure fluid passage of the valve, and a pressure higher than that of the fluid flowing through the low-pressure fluid passage. A high-pressure passage hole provided at a position facing the high-pressure fluid passage of the valve through which the fluid flows, and a bead continuously formed so as to surround both the low-pressure passage hole and the high-pressure passage hole. A first hole formed between the high-pressure passage hole and the bead, and the first hole communicates with the low-pressure passage hole through a groove formed in a connection surface of the valve. Is Together, wherein the first hole is the first fluid escape passage by communicating the low pressure fluid passage is formed.

  According to this configuration, the fluid leaking from the high-pressure fluid passage is guided by the first fluid relief passage formed by the first hole provided between the high-pressure passage hole and the bead and the groove of the connection surface of the valve. And return to the low-pressure fluid passage. For this reason, the working fluid leaked from the passage for high pressure fluid can be reduced in the area where it leaks and spreads between the beads, so that the pulling force can be reduced so as to push the gap between the gasket and the connection surface of the valve. Fluid leakage from the surface to the outside can be reduced.

Also, multiple-valve comprising a gasket of the present invention, the gasket plurality of through holes is provided continuous from the first hole, the through hole is in the first fluid release passage with along the bead It is formed so that it can communicate.

According to this configuration, there is a gasket fabric portion that is communicated with the first fluid escape passage and is bridged between the plurality of through holes provided continuously from the first hole. Therefore, the first fluid relief passage extends long. Even if it is formed, the gasket fabric portion positioned so as to be surrounded by the first fluid escape passage is less likely to be displaced. That is, the gasket is difficult to shift between the connection surfaces. Further, by providing a plurality of through-holes in addition to the first hole portion, a hole can be formed in a wide range leaving portions that block the high-pressure fluid passage and the low-pressure fluid passage, because it reduces the area widens in the working fluid leakage between the bead, a force for separating to push the between the gasket and the connecting surface of the valve can be reduced, reducing the fluid leak to the outside from the connection surface it can.

  In addition, a gasket of the present invention for achieving the above object is a multiple valve having a signal passage communicating with a pilot valve adjacent to the valve, wherein a plurality of valves each having fluid passages communicated with each other are provided in series. A gasket disposed between connection surfaces of the adjacent valves, a passage hole provided at a position facing the valve passage, and a signal passage hole provided at a position facing the signal path; A second fluid relief passage that communicates with the tank passage of the valve that communicates with the tank and that is formed up to the vicinity of the passage hole, and is disposed along the outer periphery of the second fluid relief passage, and is disposed close to the second fluid relief passage. A second bead formed so as to surround the passage hole and the signal passage hole.

According to this configuration, since the passage hole and the signal passage hole that are arranged close to each other are surrounded by the same bead, the number of beads can be reduced. Therefore, fewer repulsive force by the bead can be desired sealing force bead is sufficiently deformed to obtain. Furthermore, it is possible to suppress the deformation of the valve without increasing the tightening torque when the valve is assembled.

  Further, the gasket of the present invention is a pilot communication passage in which the passage is disposed in the vicinity of the signal passage on the connection surface of the valve and moves a spool in the valve, and is formed by the second bead. The passage hole surrounded with the signal passage hole is a communication passage hole provided at a position facing the communication passage.

According to this configuration, since the communication passage hole and the signal passage holes are arranged in the vicinity, it is possible to shorten the second bead.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a multiple valve 1 (hereinafter referred to as a multiple valve 1) including a gasket according to the present embodiment. The multiple valve 1 is used for controlling a plurality of actuators in a construction machine such as a mini excavator provided with a hydraulic actuator and a traveling crawler, for example.

  The multiple valve 1 is provided with a plurality of valves 11 to 19 each having fluid passages (passages through which oil flows) communicated with each other. The multiple valve 1 is also provided with port blocks 20, 21, and 43 that communicate with a pressure oil supply pump and a tank (not shown). Gaskets 2 (2a to 2k) are arranged between adjacent connection surfaces (11a, 12a, 12b, 13a, ... 21a, 21b, 43a) in the plurality of valves and blocks, respectively. Yes.

  FIG. 2 shows a cross-sectional view taken along line VV (a cross-sectional view of the valve 19) in which the overload relief valve of FIG. 1 is omitted as an example of the cross section of the valve. The valve 19 is a pilot operated valve that is operated by a pilot pressure from a pilot valve (not shown) connected to an operation lever, and the other valves (11 to 18) have substantially the same internal structure. The valve 19 has a tank passage 22, a supply passage 23, a center bypass passage 24, a signal passage (38 to 41), a communication passage (25 to 28) as passages that communicate with other valves in the valve connection direction. Is formed. The tank passage 22 communicates with the tank, and the supply passage 23 and the center bypass passage 24 communicate with the pressure oil supply pump. The signal passages (38 to 41) communicate with a pilot valve (not shown) disposed adjacent to the valve, and pilot pressure oil flows. The communication paths (25 to 28) are pilot communication paths for moving the spool 30 in the valve. The tank passage 22 constitutes a low-pressure fluid passage through which a low-pressure fluid (low-pressure oil) having an atmospheric pressure or tank pressure of 10 MPa or less flows. The supply passage 23 and the center bypass passage 24 constitute a high-pressure fluid passage through which a fluid (10 to 25 MPa high-pressure oil) having a higher pressure flows than a fluid (low-pressure oil) flowing through the low-pressure fluid passage.

  A spool hole 29 is provided in the valve 19, and a spool 30 is slidably inserted into the spool hole 29. Due to the movement of the spool 30 in the left-right direction (the longitudinal direction of the spool) in the drawing, the supply passage 23 and the tank passage 22 are connected to or disconnected from the actuator port 33 (33a, 33b) connected to the actuator via the passages 31, 32. The When the center bypass passage 24 is shut off, the hydraulic pressure in the supply passage 23 increases and the check valve 37 is pushed open. Thereby, the supply channel | path 23 and channel | paths 31a and 31b are connected.

  Further, the spool 30 is moved by supplying pilot pressure oil from the communication passage 25 to the hydraulic chambers 34 (34 a, 34 b) at both ends of the valve 19. Other valves are configured in substantially the same manner as the valve 19. Note that the signal passages 38 to 41 can communicate with the hydraulic chamber via an oil passage formed in the spool at a predetermined valve.

  Further, as shown in FIG. 2, the multiple valve 1 has four bolts 35 (35a to 35d) for connecting a plurality of valves, and the bolts 35 are inserted into the bolt holes 36 (36a to 36d). It is inserted.

  FIG. 3 shows a connection surface 19a (FIG. 3A) and a connection surface 13b (FIG. 3B) as examples of the valve end surface (connection surface). As shown in FIG. 3A, the connection surface 19a includes a tank passage 22, a supply passage 23, a center bypass passage 24, bolt holes 36 (36a to 36d), pilot communication passages 26 to 28 (26a and 26b). 27a, 27b, 28a, 28b) and signal paths 38 to 41 are opened. Further, a passage 42 communicating with a passage 32 (see FIG. 2) connected to the tank passage 22 is also opened on the connection surface 19a.

  Further, as shown in FIG. 3B, the connection surface 13b includes a tank passage 22, a supply passage 23, a center bypass passage 24, a bolt hole 36, a communication passage 28 (28a, 28b), and signal passages 39 to 41. It is open. Further, a passage 42 communicating with the tank passage 22 in the valve 15 is also opened in the connection surface 13b.

  Moreover, as shown in FIG.3 (b), about the center bypass channel | path 24, the communication channel | path 28, and the signal channel | path (39, 41), the groove part or the recessed part is formed in the part opened to the connection surface 13b. Since the communication passages (26 to 28) communicate with the hydraulic chambers at the respective valves, the positions of the communication passages (26 to 28) are slightly shifted for each connection surface.

  Moreover, the groove | channel 91 arrange | positioned substantially cyclically | annularly is formed in the connection surface 13a. The groove 91 is formed so as to communicate a first hole 83 and a low pressure passage hole 51 in the gasket 2 described later. In addition, the groove | channel 91 like the connection surface 13b is not formed in the connection surface 19a. That is, in the multiple valve 1, the groove 91 is formed in any one of the adjacent connection surfaces in the same manner as the connection surface 13 b.

  In the multiple valve 1, a connection surface substantially similar to that in FIG. 3 is also provided in valves other than the valve whose connection surface is shown in FIG. 3. In this multiple valve 1, each passage (22, 23, 24, 25-28, 38-41) that opens to the connection surface of each valve opens at substantially the same position or at a predetermined interval. Yes.

  Next, the gasket 2 provided in the multiple valve 1 and the gasket 2 according to the embodiment of the present invention will be described. FIG. 4 shows a plan view of the gasket 2. The gasket 2 (2a-2k) is arrange | positioned between each connection surface of the valves 11-19 and the blocks 20, 21, and 42 (refer FIG. 1). That is, it is attached facing the connection surfaces 19a and 13b shown in FIG.

  The gasket 2 is provided with a low pressure passage hole 51 at a position facing the tank passage 22 which is a low pressure fluid passage of the valve. Further, a high-pressure passage hole 52 is provided at a position facing the supply passage 23 that is a high-pressure fluid passage, and a high-pressure passage hole 53 is provided at a position facing the center bypass passage 24 that is also a high-pressure fluid passage. High pressure passage holes 54, 55 are provided at positions facing the other high pressure fluid passages in the multiple valve 1.

  The low-pressure passage hole 51 and the high-pressure passage hole (52 to 55) are surrounded by the same bead 56 formed continuously. The bead 56 is a portion formed so as to protrude from a flat portion as shown in a cross-sectional view taken along the line AA (FIG. 5A). By preventing the raised corner portion 56a from being pressed against the connection surface, fluid leakage can be prevented.

  The gasket 2 has a first hole 83 formed between the high-pressure passage hole 52 and the bead 56. This first hole 83 communicates with the tank passage 22 which is a low-pressure fluid passage through a groove 91 formed in the connection surface, whereby a first fluid relief passage 82 is formed (that is, the multiple valve 1). Is provided with a first fluid relief passage 82 constituted by the first hole 83 and the groove 91).

  Further, the gasket 2 is provided with a plurality of through holes (84 to 87) that are continuous from the first hole 83. The through holes (84 to 87) are formed along the bead 56 and capable of communicating with the first fluid escape passage 82. The holes 84 and 87 are formed on both sides of the high-pressure passage hole 53, the hole 85 is formed near the high-pressure passage hole 54, and the hole 86 is formed near the high-pressure passage hole 55.

  Thus, in the multiple valve 1, the fluid leaking from the high-pressure fluid passage 23 is formed by the first hole 83 provided between the high-pressure passage hole 52 and the bead 56 and the groove 91 on the connection surface of the valve. The first fluid relief passage 82 is guided to return to the low-pressure fluid passage 22. For this reason, since the area where the working fluid leaking from the high-pressure fluid passage 23 spreads between the beads 56 can be reduced, the force of pulling away so as to push the gap between the gasket 2 and the connection surface of the valve can be reduced. Fluid leakage from the connection surface to the outside can be reduced. In addition, fluid leaking from other high-pressure fluid passages is also provided between the high-pressure passage holes (53 to 55) and the beads 56 and communicates with the first fluid relief passage 82 through the through holes (84 to 87). And return to the low-pressure fluid passage 22. The bead 56 is formed by appropriately combining a curve and a straight line so that the area surrounded by the bead 56 is reduced.

  Further, in the gasket 2 of the multiple valve 1, there is a gasket fabric portion that is communicated with the first fluid relief passage 82 and is bridged between a plurality of through holes (84 to 87) provided continuously from the first hole 83. Will do. For this reason, even when the first fluid relief passage 82 is formed to extend long, the gasket fabric portion positioned so as to be surrounded by the first fluid relief passage 82 is less likely to be displaced (not easily detached). That is, the gasket is difficult to shift between the connection surfaces. Furthermore, by providing a plurality of through holes (84 to 87) in addition to the portion of the first hole 83, holes can be formed in a wide range leaving portions that block the high pressure fluid passage and the low pressure fluid passage, respectively. The area where the working fluid leaks and spreads between the high-pressure fluid passage and the bead can be reduced. For this reason, it is possible to reduce the force for separating the gasket 2 and the connection surface of the valve so as to spread them, and to reduce fluid leakage from the connection surface to the outside.

  Note that the size of the hole 84 is small enough to reduce the pressure of the fluid sealed in the gasket fabric portion bridged between the holes 51 and 85. The hole 87 is similarly small. Further, in the gasket 2, since the holes (83 to 87) are formed in the vicinity of all the high-pressure passage holes (52 to 53) arranged in the bead 56, all the holes that open in the bead 56 are formed. The high-pressure fluid leaking from the high-pressure fluid passage can be released to the low-pressure fluid passage.

Further, the gasket 2 is provided with a signal passage hole (a group of signal passage holes) 57 provided at a position facing the signal passage (38 to 41). Further, on the connection surface of the valve, communication passage holes (73 to 76) which are passage holes provided at positions facing the communication passages (25 to 28) which are passages disposed in the vicinity of the signal passages (38 to 41). ) Is also provided. And the 2nd fluid escape passage 61 connected to the channel | path 42 (refer FIG. 3) connected to the tank channel | path 22 is formed to the vicinity of the hole (73-76) for communication channels. Thereby, the fluid leaking from the passages (73 to 76) is guided by the second fluid escape passage 61 and returns to the tank via the tank passage 22. The second fluid relief passage 61 corresponds to the fluid relief passage according to claim 3.

The second fluid relief passage 61 is formed so as to surround the signal passage hole group 57. A second bead 89 (shown by a dotted line) is disposed along the outer periphery of the second fluid escape passage 61. The second bead 89 is formed so as to protrude from a flat portion as shown in a partial cross-sectional view taken along the line CC (FIG. 5C). The second bead 89 corresponds to the bead described in claims 3 and 4.

  The second bead 89 is disposed so as to surround the communication path holes (73 to 76) and the signal path hole group 57 that are disposed adjacent to each other. By arranging the second bead 89 in this way, the fluid is prevented from leaking outside the bead 89. The number of beads can be reduced by surrounding the communication passage holes (73 to 76) and the signal passage hole group 57 arranged in proximity to each other with the same bead 89. For this reason, the repulsive force by a bead reduces, a bead fully deform | transforms and desired sealing force can be obtained. Further, it is possible to suppress the deformation of the valve without increasing the tightening torque when the valve is assembled. Since the communication path holes (73 to 76) and the signal path hole group 57 are disposed in the vicinity, the second bead 89 can be shortened.

  Further, the gasket 2 is provided with high-pressure passage holes (63 to 65) at positions facing the other high-pressure fluid passages in the multiple valve 1, and around the high-pressure passage holes (63 to 65). Are arranged with beads (68, 90) indicated by dotted lines. FIG. 5B is a cross-sectional view (a cross-sectional view taken along the line B-B) of the high-pressure passage hole 65 and the bead 68. Among the high-pressure passage holes (63 to 65), the plurality of passage holes (63, 64) arranged close to each other are surrounded by the same bead 90 (shown by dotted lines), and the number of beads is small. It has become. Note that the number of beads may be further reduced without providing the beads 90. Further, communication passage holes (69 to 72), which are passage holes, are provided at positions facing the pilot communication passages (25 to 28), and a plurality of communication passage holes arranged in proximity to each other are provided. (69 to 72) are also surrounded by the same bead 77 (indicated by a dotted line).

  As described above, according to the multiple valve 1 and the gasket 2 according to the present embodiment, even when the working fluid is in a high pressure state, the fluid is prevented from leaking outward from the bead, and the fluid is supplied to the low pressure fluid passage. The fluid leakage from the connection surface to the outside can be reduced.

  Since the gasket 2 is a gasket in which passage holes are formed at positions facing each passage of each valve, it is not necessary to use an O-ring surrounding each passage, and a groove for the O-ring is processed into each valve. There is no need. Further, since the gasket 2 is not a metal seal, the surface roughness of the connection surface can be set low, and the surface processing of the connection surface becomes easy. Furthermore, since it is necessary to provide a plurality of signal passages or the like in a construction machine valve, if these are individually sealed, an increase in parts and processing man-hours will be caused. Can be prevented.

  And according to the multiple valve 1, since the shape of the gasket arrange | positioned between each connection surface can be made shared, the kind of gasket can be reduced.

  In addition, although the description of this embodiment demonstrated the valve | bulb for construction machinery as an example, it is not restricted to this, Between each connection surface of the multiple valve | bulb each provided with the several valve | bulb each provided with the fluid passage connected mutually The present invention is widely applicable when a gasket is disposed in the case, and has the same effect as the present embodiment.

It is a top view which shows a multiple valve provided with the gasket which concerns on embodiment of this invention. It is a VV arrow directional cross-sectional view in FIG. (A) is a figure which shows the connection surface of the valve | bulb seen from the WW arrow position in FIG. 1, (b) is the connection surface of the valve | bulb seen from the XX arrow position in FIG. FIG. It is a top view of the gasket concerning the embodiment of the present invention. It is principal part sectional drawing seen from the AA, BB, CC line arrow position in FIG.

Explanation of symbols

1 Multiple valve 2, 2a-2k Gasket 11-19 Valve 11a, 12a, 12b, 13a, 13b, 14a, 14b, 15a, 15b, 16a, 16b, 17a, 17b, 18a, 18b, 19a, 19b, 20a, 20b, 21a, 21b, 43a Connection surface 22 Tank passage (passage for low-pressure fluid)
23 Pressure oil supply passage (passage for high pressure fluid)
24 Center bypass passage (passage for high-pressure fluid)
51 Low Pressure Passage Holes 52-55 High Pressure Passage Hole 56 Bead 82 First Fluid Escape Passage 83 Multiple Holes 91 Groove

Claims (4)

A multiple valve in which a plurality of valves each having fluid passages communicated with each other is provided,
Gaskets are respectively disposed between the connection surfaces of adjacent valves in the plurality of valves,
The gasket includes
A low-pressure passage hole provided at a position facing the low-pressure fluid passage of the valve;
A high-pressure passage hole provided at a position facing the high-pressure fluid passage of the valve through which a fluid having a pressure higher than that of the fluid flowing through the low-pressure fluid passage;
A bead continuously formed so as to surround both the low-pressure passage hole and the high-pressure passage hole;
A first hole formed between the high-pressure passage hole and the bead;
Is provided,
The first hole communicates with the low pressure passage hole through a groove formed in the connection surface of the valve, and the first fluid relief passage is formed by the first hole communicating with the low pressure fluid passage. A multiple valve comprising a gasket characterized by being formed. The gasket plurality of through holes is provided continuous from the first hole, the through hole is characterized in that it is communicatively formed in the first fluid release passage with along the bead claims A multiple valve comprising the gasket according to Item 1. In a multi-valve having a signal passage communicating with a pilot valve adjacent to each of a plurality of valves each having a fluid passage communicated with each other, a gasket disposed between connecting surfaces of the adjacent valves. There,
A passage hole provided at a position facing the passage of the valve;
A signal path hole provided at a position facing the signal path;
A passage relief formed have that stream body to the vicinity of the passage hole communicates with the tank passage of the valve leading to the tank,
While being arranged along the outer periphery of the front Symbol flow body relief passage, and the ruby over de are formed so as to surround the passage holes which are closely spaced and the said signal passage hole,
A gasket characterized by comprising: The passage is disposed in the vicinity of the signal passage on the connection surface of the valve and is a pilot communication passage for moving a spool in the valve,
The passage hole surrounded with the signal passage hole by pre millet over de is gasket according to claim 3, wherein a communicating passage holes provided in the communication passage facing position.

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