JP2004108419A - Gasket and multiple string valve equipped with gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce fluid leakage even if working fluid is at a high pressure. <P>SOLUTION: A gasket 2 is arranged between connecting faces of two members (11 to 19) providing a fluid passage communicating with each other, respectively. There are provided with a port 51 for a low pressure passage installed in the position opposed to a passage 22 for low pressure fluid of members (11 to 19), and ports (52 to 55) for high pressure passages installed in the position opposed to passages (23 to 24) for high pressure fluid of the members (11 to 19) through which the fluid of pressure higher than that of the fluid flowing through the port for low pressure fluid flows. The port 51 for the low pressure passage and the ports (52 to 55) for the high pressure passage are surrounded with a continuous and identical bead 56. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a gasket disposed between a connection surface of two members each having a fluid passage communicated with each other, and a plurality of valves each having a fluid passage communicated with each other, wherein each connection surface of the valve is provided. The present invention relates to a multiple valve including a gasket having a gasket disposed therebetween.
[0002]
[Prior art]
In some cases, a gasket is disposed between the connection surfaces of two members each having a fluid passage communicated with each other to prevent leakage of fluid from between the connection surfaces. For example, there is a case where a gasket is arranged between the connection surfaces of two adjacent valves. As described above, as a device in which a gasket is provided between valves and the like, there is a device described in Patent Document 1 below.
[0003]
However, when the gasket described in Patent Literature 1 is applied between the connection surfaces of two members, the member to be applied uses a high-pressure working fluid such as a valve for a construction machine. (In the case of a construction machine valve, high pressure oil of about 25 MPa is often used), and there is a concern that the working fluid may leak. Further, in a multiple valve in which a plurality of valves each having a fluid passage communicated with each other are connected in series, for example, in a multiple valve for a construction machine, the position of a passage that is opened on each connection surface of each valve is determined by each connection. It often differs from surface to surface, and many types of gaskets need to be manufactured according to the shape of each connection surface.
[0004]
In addition, it is necessary to position the gasket with respect to the connection surface of each member. Such positioning mechanisms include those described in Patent Literature 2 and Patent Literature 3 below. In these methods, positioning is provided by providing a projecting portion for positioning on the gasket side, and by forming a concave portion on the member side to be fitted with the projecting portion of the gasket. However, according to these positioning mechanisms, processing is also required on the member side, which leads to an increase in man-hours and a complicated structure.
[0005]
[Patent Document 1]
JP-A-3-189487 [Patent Document 2]
JP-A-11-351395 [Patent Document 3]
JP-A-5-346168
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and has an object to provide a gasket disposed between a connection surface of two members having a fluid passage communicating with each other, which can reduce fluid leakage even when a working fluid has a high pressure. . It is another object of the present invention to reduce the types of gaskets in a multiple valve in which a gasket is disposed between connecting surfaces of valves that are connected in series. It is another object of the present invention to provide a gasket including a positioning mechanism that is easy to process and a multiple valve including the gasket.
[0007]
[Means for Solving the Problems]
The gasket according to claim 1, which solves the above-mentioned problem, is a gasket disposed between a connecting surface of two members each having a fluid passage communicated with each other, the gasket facing a low-pressure fluid passage of the member. And a high-pressure passage hole provided at a position facing the high-pressure fluid passage of the member through which a fluid having a higher pressure than the fluid flowing through the low-pressure fluid passage is provided. The low-pressure passage hole and the high-pressure passage hole are surrounded by the same continuous bead.
Here, the bead is a portion formed to be more protruded than a flat portion.
According to this configuration, since the contact surface pressure is high in the bead, even if the fluid leaks from the high-pressure fluid passage, the fluid is supplied to the low-pressure fluid passage through the low-pressure passage hole surrounded by the same bead together with the high-pressure passage hole. You can go back. For this reason, even if the working fluid is at a high pressure, the fluid can be prevented from leaking to the outside of the bead, and the fluid leakage between the gasket and the member can be reduced.
[0008]
According to a second aspect of the present invention, in the gasket according to the first aspect, a fluid release passage communicating with the low-pressure fluid passage is formed substantially along the bead from the vicinity of the high-pressure passage hole.
According to this configuration, the fluid leaked from the high-pressure fluid passage, which is guided by the fluid escape passage along the inside of the bead, easily returns to the low-pressure fluid passage, and the fluid leakage between the gasket and the member can be further reduced. .
[0009]
The gasket according to claim 3, wherein the gasket is disposed between a connection surface of two members each having a fluid passage communicated with each other, and has a passage hole provided at a position facing the passage of the member. A fluid escape passage communicating with the tank passage of the member communicating with the tank is formed up to the vicinity of the passage hole.
According to this configuration, since the fluid leaked from the passage is guided to the fluid escape passage and returns to the tank through the tank passage, the fluid leak between the gasket and the member is reduced even when the working fluid is at a high pressure. can do.
[0010]
A gasket according to a fourth aspect is the gasket according to the third aspect, wherein a bead is arranged along an outer periphery of the fluid escape passage.
According to this configuration, it is possible to suppress the fluid from leaking to the outside of the bead, and to return the fluid leaked from the passage to the tank along the fluid escape passage. Then, the pressure of the fluid leaking from the passage decreases in the fluid escape passage, and the fluid pressure acting on the bead also decreases, so that the fluid leakage between the gasket and the member can be further reduced.
[0011]
A multiple valve provided with the gasket according to claim 5, wherein a plurality of valves each having a fluid passage communicated with each other are connected in series, and each connection surface of adjacent valves in the plurality of valves is provided. A gasket is disposed between the gaskets, and each passage opening to each connection surface of each valve opens at substantially the same position, or at a position separated by a predetermined interval. A passage hole is formed at a position facing the passage.
According to this configuration, the shape of the gasket disposed between the connection surfaces can be made common, so that the type of the gasket can be reduced.
[0012]
The gasket according to claim 6, wherein the gasket is disposed between a connection surface of two members each including a fluid passage communicated with each other, and a passage hole provided at a position facing the passage of the member, A bolt hole provided at a position facing a bolt hole through which a bolt for connecting the member is inserted, and a claw portion engageable with the bolt hole, wherein the claw portion includes the bolt and the bolt hole. And bendable so that it can be inserted into the gap.
According to this configuration, by engaging the claw portion with the bolt hole, the positioning can be performed with respect to the connection surface of the member, and the passage of the member can be aligned with the passage hole of the gasket. That is, as the positioning mechanism, only the claw portion is provided on the gasket and processing on the member side is not necessary, so that a positioning mechanism that can be easily processed can be realized.
[0013]
A multiple valve provided with the gasket according to claim 7, wherein the multiple valves each having a fluid passage communicated with each other are connected in series, and each connection surface of adjacent valves in the multiple valves is provided. A gasket is arranged between the gaskets, and the gasket is provided at a position facing a bead, a passage hole provided at a position facing the passage of the valve, and a bolt hole through which a bolt connecting the valve is inserted. And a claw portion bent so as to be engageable with the bolt hole, wherein the bolt hole is formed to have a larger diameter than a bolt diameter, and the claw portion is formed by the bolt and the bolt. By being engaged with the bolt hole between the holes, the respective passages of the valve are positioned so as to face the passage holes of the gasket.
According to this configuration, the claw portion is positioned by engaging with the gap provided between the bolt and the bolt hole. That is, it is not necessary to perform a new process for engaging the claw portion on the valve side, and a positioning mechanism that can be easily processed can be realized. Further, the beads and the passage holes are positioned at predetermined positions, so that fluid leakage can be reduced.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a multiple valve 1 including a gasket according to the present embodiment (hereinafter, referred to as “multiple valve 1”). The multiple valve 1 is used for controlling a plurality of actuators in a construction machine such as a mini shovel having a hydraulic actuator and a traveling crawler.
[0015]
The multiple valve 1 is provided with a plurality of valves (members) 11 to 19 each including a fluid passage (a passage through which oil flows) that is communicated with each other. The multiple valve 1 is also provided with port blocks (members) 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) of a plurality of members (valves, blocks). Have been.
[0016]
FIG. 2 is a cross-sectional view (cross-sectional view of the valve 19) taken along the line VV in which the overload relief valve of FIG. 1 is omitted as an example of a valve cross-section. The valve 19 is a pilot-operated valve operated by a pilot pressure from a remote control valve (not shown) connected to the operation lever, and the other valves (11 to 18) also have substantially the same internal structure. The valve 19 includes a tank passage 22 that communicates with the tank, a supply passage 23 and a center bypass passage 24 that communicates with a pressure oil supply pump, and a pilot pressure oil. Flowing pilot passages (25 to 28, 38 to 41) are formed. The tank passage 22 forms a low-pressure fluid passage through which a low-pressure fluid (low-pressure oil) having an atmospheric pressure or a tank pressure of 10 Mpa or less flows, and the supply passage 23 and the center bypass passage 24 flow through the low-pressure fluid passage. A high-pressure fluid passage through which a fluid (high-pressure oil of 10 to 25 Mpa) higher in pressure than the fluid (low-pressure oil) flows.
[0017]
A spool hole 29 is provided in the valve 19, and a spool 30 is slidably inserted into the spool hole 29. The supply passage 23 and the tank passage 22 are connected or disconnected from the actuator port 33 connected to the actuator via the communication passages 31 and 32 by the movement of the spool 30 in the left and right direction in the drawing. When the center bypass passage 24 is shut off, the oil pressure in the supply passage 23 increases, and the check valve 37 is pushed open to communicate with the communication passage 31a or 31b. Further, the spool 30 moves when the pilot pressure oil is supplied from the pilot passage 25 to the hydraulic chambers 34 at both ends of the valve 19. The other valves have substantially the same configuration. The pilot passages 38 to 41 can communicate with the hydraulic chamber through an oil passage formed in the spool at a predetermined valve. The multiple valve 1 has four bolts 35 for connecting a plurality of valves (members), and the bolts 35 are inserted into bolt holes 36.
[0018]
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, a tank passage 22, a supply passage 23, a center bypass passage 24, a bolt hole 36, and pilot passages 26 to 28 and 38 to 41 are opened in the connection surface 19a. A passage 42 communicating with the communication passage 32 (see FIG. 2) to the tank passage 22 is also open. As shown in FIG. 3B, a tank passage 22, a supply passage 23, a center bypass passage 24, a bolt hole 36, a pilot passage 28, and 39 to 41 are opened in the connection surface 13b. Further, a passage 42 communicating with the communication passage to the tank passage 22 in the valve 15 is also opened. Note that the center bypass passage 24 and the pilot passages 28, 39, 41 are shown with grooves or recesses formed in the openings. The pilot passage is slightly different for each connection surface because it communicates with each hydraulic chamber in each valve, but the other valves also have connection surfaces substantially similar to those in FIG. As described above, in the multiple valve 1, the passages (22, 23, 24, 25 to 28, 38 to 41) that open to the connection surfaces of the valves are located at substantially the same position or at positions separated by a predetermined interval. It is open.
[0019]
Next, the gasket 2 of 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 gaskets 2 (2a to 2k) are arranged between the connection surfaces of the valves (members) 11 to 19 or the blocks (members) 20, 21, and 43 (see FIG. 1). That is, it is mounted 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 low-pressure fluid passage (tank passage 22) of the valve. Further, high pressure passage holes 52 and 53 are provided at positions opposed to the supply passage 23 and the center bypass passage 24 which are high pressure fluid passages, respectively, and the high pressure passage holes 52 and 53 are provided at positions opposed to other high pressure fluid passages in the multiple valve 1. Passage holes 54 and 55 are provided. The low-pressure passage hole 51 and the high-pressure passage hole (52 to 55) are surrounded by the same continuous bead 56. 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). The raised corner (corner) portion 56a is pressed against the connection surface, thereby preventing fluid leakage. Further, a fluid relief passage 51a communicating with the low-pressure fluid passage (tank passage 22) is formed substantially along the bead 56 from near the high-pressure passage hole. The beat 56 is formed by a straight line including a curve, and is formed so that the area surrounded by the beat 56 becomes small.
[0020]
The gasket 2 is provided with a passage hole group 57 at a position facing the pilot passages (38 to 41) of the valve. A fluid escape passage 61 communicating with the passage 42 (see FIG. 3) communicating with the tank passage is formed up to the vicinity of the passage hole group 57. The fluid escape passage 61 is formed so as to surround most of the passage hole group 57. Further, a bead 62 is arranged along the outer periphery of the fluid escape passage 61. The bead 62 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).
[0021]
Further, high pressure passage holes (63 to 65) are provided at positions facing the other high pressure fluid passages in the multiple valve 1, and beads are provided around the high pressure passage holes (63 to 65), respectively. (66-68) are arranged. FIG. 5B is a cross-sectional view (a cross-sectional view taken along line BB) of the high-pressure passage hole 65 and the bead 68. Further, passage holes (69 to 76) are provided at positions facing the pilot passages (25 to 28), and the passage holes (69 to 72) and the passage holes (73 to 76) have the same beads. 77 and 78 respectively.
[0022]
The gasket 2 is provided with bolt holes 79 (79a-d) at positions facing the bolt holes 36 (36a-d) of the valve. The bolt holes 79a and 79d at the distant positions have three claw portions 80 and 81 respectively engageable with the bolt holes 36a and 36d (see FIG. 3) inside the bolt holes 79a and 79d. It is provided so as to protrude. FIG. 5D shows a cross-sectional view (a cross-sectional view taken along line DD) of the claw portion 81 (the same applies to the claw portion 80). In FIG. 5D, the bolt 35a is formed to be inclined at an angle of about 45 °, and can be inserted into a gap between the bolt 35a (or 35d) and the bolt hole 36a (or 36d). Since the bolt hole has a gap equivalent to a screw thread and is formed slightly larger in diameter than the bolt diameter, the claw portions 80 and 81 can be inserted using this. As described above, the pawl portions 80 and 81 are engaged with the bolt holes 36 between the bolts 35 and the bolt holes 36, so that the respective passages of the valve and the gasket passage holes are positioned so as to face each other. . Further, since the three claw portions are provided for one bolt hole 36, the displacement of the gasket 2 with respect to the connection surface can be prevented.
[0023]
The above is the description of the multiple valve 1 and the gasket 2 according to the present embodiment. According to the gasket 2, fluid leakage can be reduced even when the working fluid has a high pressure. Since the gasket has a passage hole formed at a position facing each passage of each valve, it is not necessary to use an O-ring surrounding each passage, and it is not necessary to form an O-ring groove in each valve. . In addition, since it is not a metal seal, the surface roughness of the connection surface can be reduced, and the surface processing of the connection surface becomes easy. Further, in a construction machine valve, since it is necessary to provide a plurality of pilot passages, if these are individually sealed, an increase in parts and processing man-hours is caused, but this can be prevented. And according to the multiple valve 1, since the shape of the gasket arranged between each connection surface can be made common, the type of gasket can be reduced. The description of the present embodiment has been given by taking a construction machine valve as an example. However, the present invention is not limited to this, and when the gasket is arranged between two connection surfaces each having a fluid passage communicating with each other, the present invention It is widely applicable and has a similar effect.
[0024]
【The invention's effect】
According to the first aspect of the present invention, since the contact pressure is high in the bead, even if fluid leaks from the high-pressure fluid passage, the low-pressure fluid passage is surrounded by the same bead and the low-pressure passage hole surrounded by the high-pressure passage hole. Fluid can be returned to the For this reason, even if the working fluid is at a high pressure, the fluid can be prevented from leaking to the outside of the bead, and the fluid leakage between the gasket and the member can be reduced.
According to the second aspect of the present invention, the fluid leaked from the high-pressure fluid passage, which is guided by the fluid escape passage along the inside of the bead, easily returns to the low-pressure fluid passage, and prevents fluid leakage between the gasket and the member. It can be further reduced.
According to the third aspect of the invention, since the fluid leaked from the passage is guided to the fluid escape passage and returns to the tank via the tank passage, the fluid between the gasket and the member can be maintained even when the working fluid has a high pressure. Leakage can be reduced.
According to the fourth aspect of the present invention, it is possible to prevent the fluid from leaking to the outside of the bead and return the fluid leaked from the passage to the tank along the fluid escape passage. Then, the pressure of the fluid leaking from the passage decreases in the fluid escape passage, and the fluid pressure acting on the bead also decreases, so that the fluid leakage between the gasket and the member can be further reduced. According to the invention of claim 5, since the shape of the gasket disposed between the connection surfaces can be made common, the type of the gasket can be reduced.
According to the invention of claim 6, by engaging the claw portion with the bolt hole, it is possible to position the member with respect to the connection surface of the member, so that the passage of the member and the passage hole of the gasket can be matched. That is, as the positioning mechanism, only the claw portion is provided on the gasket and processing on the member side is not necessary, so that a positioning mechanism that can be easily processed can be realized.
According to the seventh aspect of the present invention, the positioning is performed by engaging the claw portion with the gap provided between the bolt and the bolt hole. That is, it is not necessary to perform a new process for engaging the claw portion on the valve side, and a positioning mechanism that can be easily processed can be realized. Further, the beads and the passage holes are positioned at predetermined positions, so that fluid leakage can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view showing a multiple valve including a gasket according to the present embodiment.
FIG. 2 is a sectional view taken along line VV in FIG.
FIG. 3 (a) is a view taken on line WW in FIG. 1 and shows a connection surface of a valve in the multiple valve according to the present embodiment.
(B) It is the XX arrow line view in FIG. 1 which shows the connection surface of the valve in the multiple valve which concerns on this embodiment.
FIG. 4 is a plan view of the gasket according to the embodiment.
5 is a cross-sectional view of a main part taken along line AA, BB, CC, and DD in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multiple valve 2 Gasket 11-19 Valve 22 Low pressure fluid passage 23, 24 High pressure fluid passage 51 Low pressure passage hole 52-55 High pressure passage hole

Claims (7)

A gasket disposed between connecting surfaces of two members each having a fluid passage communicated with each other,
A low-pressure passage hole provided at a position facing the low-pressure fluid passage of the member, and a low-pressure passage hole provided at a position facing the high-pressure fluid passage of the member through which a higher-pressure fluid flows than the low-pressure fluid passage fluid A high pressure passage hole,
A gasket, wherein the low-pressure passage hole and the high-pressure passage hole are surrounded by the same continuous bead. The gasket according to claim 1, wherein a fluid release passage communicating with the low-pressure fluid passage is formed substantially along the bead from near the high-pressure passage hole. A gasket disposed between connecting surfaces of two members each having a fluid passage communicated with each other,
A gasket comprising a passage hole provided at a position facing a passage of the member, and a fluid escape passage communicating with a tank passage of the member communicating with a tank is formed up to a vicinity of the passage hole. The gasket according to claim 3, wherein a bead is arranged along an outer periphery of the fluid escape passage. A multiple valve in which a plurality of valves each having a fluid passage communicated with each other are provided in series,
Gaskets are respectively arranged between connection surfaces of adjacent valves in the plurality of valves,
Each passage opening to each connection surface of each of the valves is opened at substantially the same position, or at a position separated by a predetermined interval,
A multiple valve comprising a gasket, wherein a passage hole is formed in the gasket at a position facing each of the passages of each of the valves. A gasket disposed between connecting surfaces of two members each having a fluid passage communicated with each other,
A passage hole provided at a position facing the passage of the member, a bolt hole provided at a position facing a bolt hole into which a bolt connecting the member is inserted, and a claw portion engageable with the bolt hole And
The gasket, wherein the claw portion is bent so as to be inserted into a gap between the bolt and the bolt hole. A multiple valve in which a plurality of valves each having a fluid passage communicated with each other are provided in series,
Gaskets are respectively arranged between connection surfaces of adjacent valves in the plurality of valves,
The gasket includes a bead, a passage hole provided at a position facing the valve passage, a bolt hole provided at a position facing a bolt hole through which a bolt connecting the valve is inserted, and the bolt hole. And a claw portion bent to be engageable with
The bolt hole is formed with a larger diameter than the bolt diameter,
The claw portion is engaged with the bolt hole between the bolt and the bolt hole, whereby the respective passages of the valve and the passage holes of the gasket are positioned so as to face each other. Valve with a gasket.

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