JPH0658444A - Directional control valve - Google Patents

Abstract

PURPOSE: To miniaturize and lighten a directional control valve for a drilling machine by making it possible to switch connection of a user port and a tank port by reciprocating motion of the tank and a main spool and providing a valve means to perform pressure, suction, by-pass and drawing functions between the main spool and a user port and tank connecting channel. CONSTITUTION: A main spool 16 is inserted into a hpusing 20 free to reciprocate and ring recessed parts 23-29 are formed on it, and they are respectively connected to ports, etc. That is, they are formed so that a connecting channel 30 connects the recessed part 23 to the user port A and the connecting channel 35 connects the recessed part 24 to the user port B by motion of the main spool 16. Additionally, a tank connecting channel 36 to connect to the tank port and a connection 46 to an opening of an inclined surface 10 are provided between the connecting channel 30 and the main spool 16, and a valve means 22 is arranged on this connection 46. The tank connecting channel 36 is connected to a tank channel 38 through a tank port channel 37. A tank connecting channel 40 is also formed in the same way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directional control valve. In particular, the present invention relates to a directional control valve used to control the flow direction of a fluid, and more particularly to a directional control valve used in the fields of excavators, hoists, construction machinery, agricultural machinery, automobile manufacturing, and the like.

[0002]

2. Description of the Related Art The prior art is German Patent Publication No. 211.
9763, 2302043, 2745155 (corresponding US Patent Publication No. 4078574) 3240038, 230
No. 2042, 3701211, and 2426071. Manesman-Rexroth Prospectus RD09307 /
4.86 discloses a directional control valve of the type to which the present invention pertains.

Directional control valves, which are considered to be the main valve, often require one or more so-called second valves. Providing the second valve with respect to the main valve requires a large amount of space in the design of the valve and results in a relatively high weight. This is a disadvantage, especially in the field of fluid valves. Furthermore, the operability of the secondary valve is also difficult.

For example, in the fluid valve shown in the above-mentioned description, a secondary valve was used for connection to the tank port between the main spool and the user port. Similarly, the aforementioned German patent publication 391 460 shows that an additional secondary valve was used to control the flow of fluid between the main spool and the user port. Thus, both valves required their own space within the housing of the fluid control valve.

The present invention seeks to solve one or more of the problems set forth above. Incidentally, such a fluid valve is often called a mobile valve.

[0006]

SUMMARY OF THE INVENTION One object of the present invention is to provide a directional control valve that allows for a compact fluid directional control valve design and has reduced weight. Another object of the present invention is to provide a valve that can provide more space for a secondary valve used with the main valve of a directional control valve. Yet another object of the invention is to meet the demands of users of such valves,
It is to provide a valve that can be applied immediately.

A preferred implementation of the directional control valve of the invention is set forth in claim 1 of the appended claims. Further preferred implementations are set forth in the respective dependent claims.

The present invention allows a wide range of secondary valves to be integrated into a directional control valve.

The valve of the present invention reduces the number of conduits needed to connect fluids, resulting in a reduced likelihood of leaks. The directional control valve of the present invention also has the function of a connecting plate. This increases the likelihood of checking the valve without having the valve connected to the machine that will eventually be used with the directional control valve.

The directional control valve of the present invention comprises a secondary port for connection of a secondary valve, wherein the channel of connection of the user or working port to the main spool of the directional control valve is the secondary It is possible to additionally control the opening and closing from the dynamic valve. This additional control possibility expands the application possibilities of directional control valves and surprisingly the possibilities of secondary valves that can be used.

In the directional control valve of the present invention, the basic types of valves that can be used as secondary valves are as follows. (1) The poppet valve provides complete leak-free containment and is usable. The poppet valve can be aerodynamically, hydraulically, mechanically or electrically operable. (2) A throttle valve for the oil flow from the user port to the main spool or from the main spool to the user port, a throttle check valve, as well as a 2- or 3-way flow control valve. (3) A throttle valve or a throttle valve for oil flow in a bypass by way of a flow control device. (4) Reduced pressure from the main spool to the user port. (5) Pressure limitation with or without suction. (6) Function of a directional control valve in the form of a mechanically, aerodynamically, hydraulically or electrically operated two or three directional valve. (7) A throttle control and directional control valve that is operated proportionally by electrical or hydraulic means. (8) Pressure compensator. (9) Reduced brake valve function.

All the above possibilities can be assigned selectively and independently to each of said user ports without changing the concept of the valve housing.

For example, the use of a spool with four positions is no longer required. Such spools are complex and expensive parts. By integrating the directional control valve with the secondary port, the floating position is actively selected,
Moreover, the floating position is fixed at the position where the main spool is pushed or pulled.

The directional control valve of the present invention provides for the use of a single secondary valve in one single space or chamber within the housing of the control valve, the secondary valve Is at a position (1) controlling the flow of fluid between the main spool and the user port, and (2) connecting the fluid path between the main spool and the user port to the tank port, ie to the tank port. It functions as a conduit.

[0015]

A fluid directional control valve comprising a tank port, a pump port, at least one user port, and a spool reciprocally mounted in the longitudinal hole. A connection is provided between the user ports and a secondary valve can be inserted into the connection, the secondary valve not only controlling the flow of that connection, but also the flow to the tank port. Controllable configuration.

[0016]

The tank connection channel (36) connected to the tank port and the inclined surface (10) of the housing (20) are provided between the longitudinal hole (main spool) and the connection port (30: second port) of the user port. There is an opening or a connection (46) consisting of a chamber. A secondary valve (22) can be inserted into this connection (46) by means of this secondary valve (22) between the longitudinal hole (main spool) and the user port and between these and the tank port. It is possible to control the opening and closing of the fluid at two points in between.

[0017]

1 shows a known directional control valve 1 of the prior art. In fact, details of this known directional control valve are disclosed in the aforementioned prior art publications and the like. The control valve 1 comprises a housing 2 having a longitudinal hole incorporated therein for reciprocating movement of the control spool 16. Control spool 16
Owing to its different position, provides a preferred connection via a connection channel provided in the housing. The connections are made in the same way for the user ports A, B and the respective ports T, P of the tank and pump respectively. The first connection is from the first connection channel 30 of the first user port hole 31 to the control spool 16 and from there to the first connection channel 30.
It can be appreciated that it is provided between the tank connection channel 36 and the tank connection channel 36. For the user port B, a mirror-symmetrical relationship leads to a second connection, for which a detailed description is not required. The pressure supply valve cartridge 5 has a connecting channel 30.
And the tank connection channel 36 are opened and closed. Furthermore, the check valve is shown, although not referenced.

FIG. 2 is a schematic representation showing details of the control valve 1 of FIG. 1 of the prior art just described. FIG. 2 shows a connection 21 that provides a fluid path between the connection channel 30 and the tank connection channel 36.

Referring to FIGS. 4 to 7 and FIGS. 3 and 9,
A directional control valve 100 of the present invention is described. Basically,
The type of valve shown in FIG. 1 relates to an improvement over such prior art.

The directional control valve 100 has a surface 3 (FIGS. 6 and 7),
The housing 20 has a bottom surface 4 (FIG. 6), a right side surface 6, a left side surface 7, an upper surface 8, a lower surface 9, and similarly left and right inclined surfaces 10 and 11. The main spool 16 is shown in FIG. A longitudinal hole 14 adapted to receive the main spool 16 is also shown in FIG. The control spool shaft is designated by the reference numeral 13.

Reference numbers 18 and 19 depict the right and left second surfaces, respectively. As mentioned at the beginning, the term "second" is used. This is because the directional control valve should be called the main or first valve. A so-called second valve is arranged on the second surface 18, 19 and cooperates with the fluid mechanism connected to the second valve.

In particular, FIG. 4 illustrates annular recesses 23 to 29 in the housing 20 in the area of the longitudinal hole 14. The annular recesses 23 to 29 are connected to ports or the like. For example, connection channel 3
0 is also referred to as the second port, from the fluid path, i.e. the first user port A, i.e. the port hole 31, to the main spool 16 (or a longitudinal hole for receiving the main spool).
To provide a connection to.

The second user port is illustrated by the reference symbol B, and the port hole of the user port B is illustrated by the reference number 33. The respective axes of the port holes 31 and 33 are illustrated by the reference numerals 32 and 34. Connection channel 35 is directed to main spool 16 and corresponds to connection channel 30 providing user port A.

Similar to the prior art valve shown in FIG. 1, the control valve 100 of the present invention includes a tank connection channel 3
6 and it is connected to the tank port 38 via the tank port channel 37 and subsequently to the tank channel 38. Similarly, the tank connection channel 40 is connected to the tank channel 38 via the tank port channel 39. The additional channels required for control valve 100 (similar to prior art directional control valve 1) are shown in FIG. 1 as in FIG. And reference numbers 47 and 5
4 referred to. To the extent that it is well known in the prior art, detailed description of the embodiments of the invention can be omitted.

Referring to FIG. 7, the contact surfaces 61 to 63 are
Shown with a generally rectangular channel 64. Furthermore, faces 66 and 67 can be seen as connected to the tank channel.

3 and 8 show the essential features of the invention in a schematic representation of the connection between the connection channel 30 and the tank connection channel 36 (FIG. 4). When referring to FIGS. 8 and 3, it should be noted that the representation of FIG. 8 has been tilted back by the angle alpha (α) referenced in FIG. That is, FIG. 8 shows a main part of FIG. 4 extracted, and FIG. 3 shows a schematic view of this part.
This note refers to user port B, tank connection channel 4
The same applies to the connection between 0 and the connection channel 35, as well as to the different control possibilities shown in FIG.

In the prior art FIG. 2, connection 21 is connected channel 30 by means of pressure relief valve 5 only.
It should be noted that it permits the opening and closing of the tank connection channel 36 or from the tank connection channel 36 to the connection channel 30. In contrast to that, according to the present invention, the first connection 46 (see FIGS. 3 and 8) is such that the user port A is arranged on the so-called second side towards the main spool 16. It can be opened or closed by two valves. The same applies to the user port B and the connection channel 35. According to this configuration, "said first connection 46 is provided inside valve housing 20 in such a way that valve means 22 (Fig. 3) are adapted to be inserted into said connection 46, This not only can provide connection and / or blocking between said (first) connection channel 30 and (first) tank connection channel 36, but also from (first) user port A to main spool 16 To (first)
It makes it possible to open and / or control the connection channels. As such, the connection channel 30 is divided into two connection channels 30 ', 30 ".

Similarly, the second connection can be brought to the respective channel of the second user port B. Similar comments are made for user port B as for user port A.

Connection 46 shown in particular in FIGS. 3, 4 and 8.
Continuing with the description of FIG. 4, it can be seen in FIG. 4 that the connection 46 extends from the right sloped surface 10 along the second sloped axis 18 and across the first tank connection channel 36. Then, the connection channel section 30 ″ (notice that the connection channel section 30 ′ is led to the user port A in FIG. 3 and FIG. 8), and eventually the connection channel section 30 ′ (the rear section is mainly Spool 1
6). The connection 46 is provided in the form of a beveled opening or chamber, for example FIG.
Forming the control end of the valve 70 shown at. FIG. 9 shows a variety of different types of so-called second valves 70, which can be used with a “main” valve 100. It should be noted that it is possible to insert a valve cartridge into the chamber or opening (connection 46 in FIGS. 3, 4 and 8) that implements the second valve 70 shown in FIG.

In particular, referring to FIG. 8, the connection 46 is made up of three parts 43, 44, 45, and part 45 is again made up of two parts 55 and 56. I understand.

10 to 13 show cross-sectional views of an embodiment using a different type of second valve, which valve can be placed in the connection 46 which is an aperture. FIG. 14 shows FIG.
Fig. 7 is a view similar to that, but including the control lever. Figure 1
5 is a plan view of the valves of the present invention interconnected.

In summary, the present invention, the connection 46, which is a chamber or aperture, forms two control ends. One control end is located on the right side of the bracket 55 in FIG. 8 and the other control end is located on the left side of the bracket 56. These two ends allow control of the flow path between the main spool and the user port and the flow path of the tank port in a simple manner.

[0033]

EFFECTS OF THE INVENTION A compact, compact and lightweight directional control valve can be designed, a space for a secondary valve can be expanded, and various secondary valves can be mounted. Thus, the various functions described in the problem to be solved by the invention can be realized.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view of a prior art directional control valve.

2 is a schematic diagram of details of the directional control valve of FIG. 1. FIG.

FIG. 3 is a schematic view of a detail of the directional control valve of the present invention shown in FIGS. 4 to 9, the detail being taken from the area of the connection channel between the main spool and the user port.

4 is a longitudinal sectional view of the directional control valve of the present invention taken along line 4-4 in FIG.

5 is a right side elevational view of the valve of FIG. 4. FIG.

FIG. 6 is a plan view of the valve of FIG.

7 is a perspective view of the directional control valve of the present invention shown in FIGS. 4 to 6. FIG.

FIG. 8 is a schematic diagram of details of the invention in the area of connection to the main spool.

FIG. 9 is a different control or valve system of the directional control valve of the present invention.

FIG. 10 is a longitudinal cross-sectional view of a directional control valve having different types of secondary valves connected to a second port.

FIG. 11 is a longitudinal cross-sectional view of a directional control valve having different types of secondary valves connected to a second port.

FIG. 12 is a longitudinal cross-sectional view of a directional control valve having different types of secondary valves connected to a second port.

FIG. 13 is a longitudinal cross-sectional view of a directional control valve having different types of secondary valves connected to a second port.

FIG. 14 is a longitudinal sectional view of a directional control valve having a control lever.

FIG. 15 is a plan view of three directional control valves of the present invention connected together.

[Explanation of symbols]

 10 inclined surface 13 main spool shaft 16 main spool 18,19 inclined second shaft 20 housing 22 valve means 30,35 connection channel (second port) 36,40 tank connection channel 37,39 tank port channel 38 tank channel 46 connection

Claims (20)

[Claims] 1. A housing, a pump, a tank, a user port provided in the housing, a long hole provided in the housing, and a main spool reciprocally mounted in the long hole. A connection between a second port provided in a region connecting the main spool and the user port, a second port of the housing provided in the housing, and a tank connection channel leading to the tank port. A chamber or opening to provide a pressure, suction, bypass, throttle disposed within the chamber or opening to provide the required valve function between the main spool and the user port and the tank channel. A directional control valve comprising: a valve means that provides a function. 2. The housing forms a control end, one of the control ends being arranged in a direction towards the main spool and the other in a direction towards the tank connecting channel. The directional control valve according to claim 1, which is characterized in that: 3. A first connection (at least between a first connection channel (30) leading from the first user port (A) to the main spool (16) and the tank connection channel (36). The directional control valve according to claim 2, further comprising 46). 4. A second connection is provided between a second tank connection channel (40) and a second connection channel (35) leading from the second user port (B) to the main spool (16). Provided, a first valve means is provided at said first connection, a second valve means is provided at said second connection, and further said first and / or second connection (46) is In the housing of the valve, the valve means includes first and second
Not only can open and close the connection between the first connection channel and the first or second tank connection channel, but can also open and close the first and second connection channels leading from the first or second user port to the main spool, respectively. The directional control valve according to claim 3, characterized in that it can be controlled. 5. The first and / or second connection (46)
Forming a space or chamber adapted to receive a valve spool or a valve cartridge that interrupts the connection of the channel and at which location any type of valve function can be provided. 4. The directional control valve described in 4. 6. A directional control valve according to claim 5, characterized in that the connection (46) extends in an inclined direction with respect to the main spool shaft (13) so as to save space. 7. The connection (46) is a connection channel (3).
7. A directional control valve according to claim 6, characterized in that 0) is divided into two parts (30 'and 30 "). 8. The two parts (30 'and 30 ") are
The directional control valve according to claim 7, wherein the directional control valves are arranged in parallel with each other inside the housing. 9. The two parts (30 'and 30 ") are
9. A directional control valve according to claim 8, characterized in that it extends perpendicularly to the inclined second axis (18, 19). 10. Direction control valve according to claim 9, characterized in that the connection (46) terminates in an inclined surface (10) of the housing. 11. The directional control valve according to claim 10, wherein the valve comprises three control surfaces. 12. Direction control valve according to claim 1, characterized in that a pressure reducing valve or a direction control valve is arranged in the connection (46). 13. The directional control valve according to claim 1, which has one or more spool shafts. 14. The directional control valve of claim 13, wherein the second axis extends orthogonally to the axis of the user port. 15. A housing, an elongated hole extending into the housing, a main spool (16) reciprocally mounted in the elongated hole, at least one tank port, and at least one pump port. At least one user port (A), a connection channel (30) connecting the elongate hole to the user port, a connection channel (30) disposed between the elongate hole and the user port (A), In the connection channel of
A directional control valve comprising: valve means such that fluid flow can be controlled or the connection channel can be connected to the tank port. 16. The valve means comprises at least two control ends, one control end being used to control the flow of fluid between the longitudinal hole and the user port and the other control end being the user port. The directional control valve according to claim 15, wherein the directional control valve is used to control the connection to the connection of the tank port. 17. A single chamber or connection (46)
Is arranged in said housing (20) and is provided with a longitudinal hole (1
4) provides a connection between a connection channel (30) connected to 4) and a user port (A), as well as a tank connection channel (36) leading to a tank port, said connection (46) being said longitudinal hole. 16. The directional control valve of claim 15 adapted to receive valve means adapted to control fluid flow between said user port and said tank port. 18. A connection (46) for receiving said valve,
The directional control valve according to claim 17, wherein two pieces are arranged in a mirror-symmetrical relationship in the housing (20). 19. A directional control valve according to claim 17, characterized in that the connection (46) is closed towards the outside of the housing (20) when not used for receiving valve means. . 20. The directional control valve according to claim 1, wherein the directional control valve is used as a moving valve.