JPS63115905A - Pre-controller - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to hydraulic pre-control devices. The invention particularly relates to a hydraulic precontrol device operating on the basis of a directly operated pressure reducing valve. Such a pre-control device serves to fine-tune settings of valves, pumps and motors depending on pressure and is suitable for integration into a control panel.

Conventional technology and its problems The conventional advance control device is Firma Mannesma.
nnIt is described in the brochure 09305/7.85 of Rexroth Lohr am Main.

The conventional advance control device is operated via an operating means 2, which from its neutral position moves at least one of the
It will be moved to the first switching position and the second switching position.

Before the advance control device can be switched into either its first or second switching position, the user or the equipment attached to the user operated by the advance control device must first be placed in a certain state of use. Must be. For example, in the case of brake control, it is common practice in particular to carry out brake air supply before the actuating element is placed in its first or second switching position.

The invention therefore seeks to avoid these drawbacks of the state of the art and, in particular, to provide a prior control for placing a hydraulic signal, e.g. for actuating a brake control, in one or the other switching position before actuating the actuating means. The general problem is to form a device.

SUMMARY OF THE INVENTION To solve this problem, the present invention modifies a conventional precontrol device, for example by connecting the valve means and the pilot valve directly to the housing of the precontrol device. amended by This pilot valve can also be designed as a plate or block type, ie it is connected to a corresponding connection of the control device without a pipe connection. Preferred forms of the invention are set out in the claims.

According to a preferred embodiment of the invention, the pilot valve, which is mounted, for example, as a pneumatic valve, is actuated directly mechanically by means of an actuating means designed as a hand lever.

According to another embodiment of the invention, the pilot valve is actuated hydraulically by actuation of the actuating means. In particular, the pilot valve is actuated hydraulically via a switching valve which is mounted in the precontrol device as a plate structure without pipe connections. In this arrangement, in particular, means in the form of a spring are provided as a pre-force for placing the piston in its neutral position, according to a preferred embodiment of the pond according to the invention, by means of which it is possible to set the switching pressure. In addition to the pilot valve, a pressure reducing valve is also mounted in the form of a plate structure 7 on the other side wall of the precontrol device without any pipe connections.

By means of the invention a reliable and favorable compact structure is created.

Other characteristics, objects and details of the invention are apparent from the description of the exemplary embodiments shown in the drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS First of all, FIGS. 1 to 5 show a prior control device 1 according to the state of the art. Next, in Fig. 6, the advance control device 1
A representative phylogenetic diagram using .

The hydraulic pre-control bag Wt1 operates on the basis of a directly operated pressure reducing valve and is fitted with a Firma Mannesmann Rexr
It is described in the pamphlet of othRD 09 305/7.85.

The advance control device 1 essentially consists of a housing 2, in which an operating shaft 3 supporting an operating member 4 is swingably arranged.

Advance control device 1. is formed into a completely rectangular shape, and the upper surface 5
It has a bottom surface 6, a front surface 7, a back surface 8, a left side surface 9, and a right side surface 10.

Before explaining the details of the structure of the advance control device 1, a typical usage example of the advance control device 1 will be explained with reference to FIG. In FIG. 6, the pump 13, which is connected to the tank 14 on the inlet side, is connected to the user body 19 via the precontrol device 1. In FIG. Depending on the position of the actuating element 4, the pump 13 is connected to the user 19 via the user connection A of the precontrol device and the line 17, or the pump is connected via the user connection B and the line 18 to the user 19. and is connected to the user body 19. A pressure limit valve 16 is usually provided parallel to the pump 13.

The arc-shaped arrow illustrated on the upper part of the operating member 4 indicates that
The zero or neutral position is indicated at 53, the first switching position at 51 and the second switching position at 52.

The structure of the advance control device [1] is shown in detail in FIGS. 1 to 4. The precontrol device 1 includes two control pistons 21 in its housing, but in this case only one half or one of the control pistons 21 is illustrated for the sake of simplicity hereafter. Each control piston 21 is provided with a control spring 22 and a restoring spring 23. Furthermore, a stop 24 is provided and a piston bore 25 is formed in the control piston 21 .

The longitudinal axis of the precontrol device is designated by the reference numeral 27 in FIGS. 1, 3, and 4.

In particular in FIGS. 2 and 3, the precontrol device 1 has a pump bore 28, a tank bore 29, a first user bore 30 and a second user bore 31 for connections. The bores 28-31 extend parallel to the longitudinal axis 27. A pump connection lumen 34 extends transversely to the longitudinal axis 27 and extends in the vicinity of the piston 21 into the first and second user lumens 30 .
Connect with 31. At the same time, the tank connection inner hole 36 is also connected to the inner hole 30.
and 31, where also a tank connection bore 37 is shown.

The method of operation of this conventional advance control device 1 is well known and will only be briefly described here. The actuating means 4 is held in its neutral position 53 by the restoring spring 23 and counteracting spring means, not shown in detail. When the operating member 4 is operated, for example, into the operating position 52,
The stopper 24 is moved against the attached restoring spring 23. At the same time, the control piston 21 is moved by the control spring 22. At the beginning of the controlled movement, the connection port P is connected via the piston bore 25 and the connection port A to the device to be controlled and to the user body 19. The user body 19 is a valve, a pump or a motor. The adjustment of the user body takes place as a function of the position of the actuating member 4 and the control spring characteristics.

When the actuating member 4 is swung in the opposite direction into the first operating position 51, the other control piston is actuated and the connection port P is connected via the connection port B to the user.

The operating means provided between the operating member 4 and the stopper 24 are constructed such that only one of the stops 24 is always moved and the other remains in its designated output position.

7-10 illustrate a precontrol device 40 formed in accordance with the present invention. These modified advance control devices 40 are
It consists of a conventional precontrol device 1, a built-in pilot valve (generally valve means) 41, and an operating member 42, which controls not only the precontrol device 1 but also the pilot valve 4.
1 also works.

The actuating means 42 actuate the pilot valve 41 via coupling or operating means in the form of a rod 43 . Instead of this mechanical actuation means, hydraulic actuation means are also conceivable.

FIG. 8 shows a plan view of a guide groove (link guide) 48 formed in the guide means 46, and the guide means 46 is connected to the advance control device 4.
0 housing.

The guide groove 48 is generally T-shaped and forms a first and a second operating position 51 , 52 as well as a first valve switching position 49 and a second valve switching position 50 . Second valve switching position 5
0 corresponds to the zero or neutral position 53 of the precontrol device 1.

In the pre-control device 40, before operating the pre-control device, the operating member 42 always first activates the pre-control device 1.
It is also necessary to place the switch in the second switching position 5o, i.e. in the neutral position 53. This necessity results in that the pilot valve 41 is always actuated first before the precontrol device 1 is operated.

As will be explained in more detail below, a hydraulic signal is obtained by actuation of the pilot valve 41, which hydraulic signal is used to create a predetermined state in the user (device) actuated by the advance control device 1. be done. For example, it may be preferable to first apply the brakes before starting the user. It is actuated by a hydraulic signal obtained from the pilot valve 41, which signal is then obtained only after the actuating member 42 has been moved from the first switching position 49 to the second switching position 5o.

FIG. 9 shows a specific embodiment of the precontrol device 40 according to FIGS. 7 and 8, in which the precontrol device 40 according to the invention is shown in a partially sectional view, and also as a built-in pilot valve 41 and the actuating member. It is shown as comprising a prior control device 1 according to the state of the art with attached 42. Threaded bolts 72 and 7 for fixing the pilot valve 41 to the advance control device 1 through the advance '11ilI @ device 1
3 expands. Furthermore, extending through the housing 2 of the precontrol device 1 is a rod 43, which rod 43 is provided so as to be movable back and forth through bearing means 63 in the housing, which are not shown in detail. One end of the rod 43 extends into a bore 62 in a bearing body 55 that is fixed on the actuating shaft 3 . The bearing body 55 forms a guide means 46 which is shown schematically in FIG. 8, but the groove 48 can also be seen in FIG. The operating member 42 is located within the operating body 57 and
7 rotates around a bearing shaft 56 of a bearing body 55 and is swingable between the illustrated switching position and operating position within the drawing plane of FIG. In the position shown in FIG. 9, the operating member 42 is at position 49 in FIG. 8. In the illustrated position, the operating body 57 abuts against the abutment surface 58 of the bearing body 55 . This is provided by the force of a spring 60 provided in the inner hole 59 of the bearing body 55, and the spring 60 applies a rightward force to the operating body 57 via the abutting member 61. In the position of the operating member 42 shown in FIG. 9, the rod 43 is in its neutral position;
7. The rod 43 is held in this position by a spring 84 of the pilot valve 41, which is shown in more detail.

Further, the operating member 42 is located at a position 52 shown in FIG. 8 on the operating shaft 3.
or before applying the swinging movement to position 51, the operating member 42
must be swung back from the position shown in FIG. 9, which corresponds to the movement from position 49 to position 50 in FIG. During this movement from position 49 to position 50, a hydraulic signal should be generated via pilot valve 41, which acts, for example, to apply a brake.

This oil pressure signal is applied to the signal connection bore 77 shown in FIG.

Pilot valve 41 is then shown in more detail in FIGS. 9 and 10. The pilot valve has a housing 66 into which the aforementioned threaded ports 72, 73 are screwed to fix the pilot valve on the left side of the precontrol device 1. A bore 68 is formed within housing 66 and extends parallel to longitudinal axis 27 . A piston 80 is disposed within the inner hole 68 so as to be movable up and down. The piston 80 is spring-loaded into the illustrated starting position by the previously mentioned spring 84. The spring 84 is in this case connected to the piston end and the sealing screw 85
It is supported by In its starting position, the piston 80 abuts the bale 81, and the rod 81 is arranged to be movable up and down within a plug 82 in the bore 68. The packing 83 wraps around the rod 81. The rod 81 abuts the ball 65, and the ball 65 is arranged to be movable up and down within the recess of the plug 82. One end 65 is in contact with the swinging body 64, and the swinging main body 64 is provided so as to be swingable within the housing 66.

On the other hand, the swinging body comes into contact with one end of the salary 43. A lid 67 seals the top of the housing 66. By turning the sealing screw 85, the force from the spring 84 on the piston is applied to the piston 80. The rod 81, the ball 65, the swinging body 64, the rod 43, and the operating body 57 are adjusted so that they are in contact and take the position shown in FIG.

When the operating member 42 is swung to the left in FIG. 9 against the force of the spring 60, the spring 84 moves the piston 80 upwardly from the neutral position shown in FIG. 9 to its operating position.

There are two axially spaced bores in the housing 66, namely a pump connection bore 7o and a tank connection bore 7o.
1 is provided. These bores extend perpendicularly to the longitudinal axis 27 and are located at the level of the corresponding pump connection bore 34 or the corresponding tank connection bore 36 in the precontrol device 1. Inner hole 7
0.71 forms a connection with bore 68. Housing 6
6 and between both bores 70, 71, a signal connection bore 78 extends towards the rear in FIG. 9 and to the right in FIG. This bore 78 extends parallel to the left side 9 of the precontrol device 1 and perpendicular to the longitudinal axis 27 .

A signal connection bore 77, shown in FIG. 10 as extending parallel to the longitudinal axis 27, connects with this bore 78.

The inner hole 78 is sealed on the right side by a plug in FIG.

In the neutral position shown in FIGS. 9 and 10, the piston has tank connection bores 36 to 71 connected to signal connection bore 7.
8 , while the pump connection bores 34 and 70 are separated from the signal connection bore 78 .
．． 87.88. When the piston 80 is moved to an operating position, not shown, the pump connection bore 70
communicates with the signal connection inner hole 78, and the tank connection inner hole 71
is disconnected from the signal connection bore 77. In this way, a pressure signal is generated in the signal connection bore 78,77, which pressure signal can be used, for example, to actuate the brake directly or indirectly.

A lateral bore, indicated at 76 in FIG. 9, is connected to a longitudinal bore within piston 80 and connects two chambers formed adjacent the ends of piston 80.

Furthermore, FIG. 10 shows that the lid 67 of the pilot valve 41 is fixed to the housing by threaded bolts 74.

The method of operation of the advance control device 40 according to the invention will be understood by those skilled in the art from the above description and will therefore only be briefly summarized here. In FIGS. 7 and 9, the actuating member 42 for the modified precontrol device 40 is in its neutral position, which thus corresponds to the central position reached by the actuation of the precontrol device l, which position corresponds to the second It is indicated at 53 in the figure.

Here, in order for the advance control device 1 to become operational, the operating member 42 in FIGS. 7 and 9 must be swung to the left, so that the pilot valve 4
1 is actuated to give a signal which activates, for example, the brake air supply of the brake control. Pilot valve 41
Only after this operation has taken place is the precontrol device 1 activated.
is operational and, for example, moved into its first connection position 51 or into its second connection position 52 (see FIG. 2).

The direct integration of the pilot valve 41 into the precontrol device 1 provides the modified precontrol device 40 with a compact and reliable structure. As illustrated, the pilot valve is arranged on the side 9 of the precontrol device 1 opposite to the side surface 10 on which the operating member 42 is provided, so that the internal space provided in the precontrol device 1 is Regarding the holes, a favorable correlation is obtained for the hydraulic connection bores in the pilot valve and in the precontrol device.

The operating member 42 moves from position 50 in FIG. 8 to position 49 in FIG.
When the valve piston 8 is swung to the operating body 57, the rod 43
．． The swinging body 649 is restored to the position shown in FIG. 9 via the ball 65 and the shaft 81.

A second embodiment of a modified precontrol device 100 according to the invention is illustrated in FIGS. 11-14.

The modified advance control device 100 basically consists of a built-in pilot valve plate (pilot valve block, pilot valve) 102 and an associated pressure reducing valve plate (pressure reducing valve, pressure reducing valve plate) (see the system diagram in FIG. 11). 103. The precontrol device 1 (11 corresponds essentially to the precontrol device 1 shown in FIG. 2, which, as in the previous embodiment, serves only to connect the pilot valve.
The pilot valve 102 shown is here hydraulically operated rather than mechanically. The pilot valve plate 102 therefore has at the same time the actual pilot valve 141 as well as the hydraulic actuating means 104 and the switching valve 105.

According to another aspect of the invention, pressure reducing valve plate (pressure reducing valve) 1
03 is provided and is formed in the form of a pressure reducing valve block, which includes the connecting conduit as well as the actual pressure reducing valve 106.

First, the pressure reducing valve block 103 of the modified advance control device 100 will be explained with reference to FIGS. 11 to 14.

FIG. 12 shows that the housing 66 of the pilot valve 102 is also fixed by screws 72, 73 on the left side 9 of the precontrol device 1 (11), which is opposite to the side on which the operating member 42 is provided. .

The housing 166 has an inner hole 109 within which the piston 110 is arranged to be movable up and down. The inner hole is sealed on the lower side with a screw 155 and on the upper side with a plug 111. An inner hole 112 extends centrally within the plug 111;
Bore 112 terminates in a chamber formed in one end of piston 110 . Spring 113 holds piston 110 against plug 111 in the position shown in FIG.

The inner bore 112, on the other hand, communicates with a switching valve 114, which is also shown in detail in FIG. Threaded bolts 116 serve to secure switching valve 114 to housing 166.

The piston 110 has webs 117, 118 which, depending on the position of the piston, connect the signal connection bore 178 corresponding to the bore 78 in FIG. 9 to the pump connection bore 170 or the tank connection bore 171. Connect with. The tank connection bore 171 communicates with the tank connection bore 136 in the precontrol device 1 (11) and the pump connection bore 170.
communicates with the pump connection bore 134 in the precontrol device 1 (11).

In the neutral position of the piston 110 shown in FIG.
The radial bore 119 communicates the tank connection bore 136 with a spring 120 provided at one end of the piston 117 via a longitudinal bore 7 shown in dotted lines.

In the neutral position of the piston 110 shown in FIG.
The pump connection bore is closed and the tank connection bore 171 is connected to the signal connection bore 178. This means (see also FIG. 14) that tank pressure is applied to the connection bore 177 which extends perpendicularly to the signal connection bore 178.

When the piston is moved to an operating position different from that shown, the connection between the tank connection bore 171 and the signal connection bore 178 is broken, and the signal connection bore 178 is connected to the pump connection bore 17.
Connected to 0.

Hydraulic means, namely the aforementioned switching valve 114, are provided to move the piston 110 from the neutral position shown to the operating position. The switching valve 114 is designed to apply pressure to the piston 110 in order to actuate the piston depending on whether pressure is applied to the user conduit A or the user conduit B of the precontrol device 1 (11). Ru.

At the same time as the switching valve 114 is placed on the upper part of the pilot valve 102, two user body connection inner holes 121 and 122 are formed in the no-uji puffer 166.

These bores 121 , 122 extend parallel to bore 109 . The user body connection conduit 121 is connected to the connection port A, and the user body conduit 122 is connected to the user body connection port B. This is illustrated in FIG. In detail, the user connection conduit 12
2 is a connecting bore 12 in the housing extending perpendicular thereto;
3 to a connecting bore 124 in the housing of the precontrol device 1 (11).The connecting bore 124 extends to the bore in the housing of the precontrol device 1 (11), and the It communicates with the user body connection port B. The relationship between this inner hole and the connection ports A/B is schematically shown in FIG.
and the precontrol device 1 (110).

Here, the structure of the switching valve 114 will be explained in detail with reference to FIGS. 12 and 14. Two user connection bores 121.1
22 is a longitudinal inner hole 128 via inner holes 126 and 127.
The longitudinal bore 128 extends parallel to the side surface 9 of the precontrol device 1 (11).

A piston 129 with pins on both sides is provided in the inner bore 128, and the piston 129 connects the user connection bore 121 or 122 with the connection bore 130 depending on its position;
On the other hand, the connecting bore 130 communicates with the bore 112. The bore 112 opens into a pressure chamber 131 formed in the upper end of the piston, similar to the pressure means just mentioned.

In FIG. 12, pilot valve 114 is in a neutral position. The actuating member 42 with respect to the precontrol device 1 (11) is in its neutral position. As mentioned above, the precontrol device 1 (11), with the exception of the above-mentioned connections with the pilot valve plate 102 and the valve 114, is in its neutral position. It has a similar structure to device 1.

Therefore, when the operating member 42 is in the neutral position, pressure is applied to both the connection port A and the connection port B.

However, when the operating member 42 is in the switching position 41 shown in FIG.
or 52, pressure is immediately formed in either the user connection port A or the user connection port B, and this pressure is directly passed through the switching valve 114 to the pressure chamber 131 of the pilot valve plate 102. is supplied to move the piston 110 against the force of the spring 113 so that the pump connection bore 17'0 is connected to the signal connection bore 178. Pressure used for control purposes is thereby available at signal connection bore 177 in FIG. 14. Operation member 4
2 is returned to its neutral position again, the piston 117 is restored to the neutral position shown and thus the signal connection bore 17
The signal at 7 also returns to neutral.

In the embodiment according to FIGS. 11 to 14, the operating member 42 is similar to the state of the art shown in FIG.
It is only necessary to form it so that it can swing only within one plane.

Further, referring to FIG. 12, the pressure reducing block valve 103 already described in FIG. 11 will be explained. Pressure reducing valve block 10
3 has a housing 150, and a housing 155 is connected to the precontrol device 1 (via means not shown in detail).
It is fixed to the bottom surface 6 of 11.

Housing 150 contains the actual pressure reducing valve 106.

Furthermore, a pump connection bore 151 and a tank connection bore 152 are formed in the housing 150, and these connection bores are connected to the pressure reducing valve 106 via connection bores 153 and 154.
The piston 158 is connected to an inner bore 164 for receiving the piston 158 therein.

Piston 158 is loaded with a spring force by spring plate 159 in its position shown in FIG.
A pressure of 0 is applied, and the spring 160 has one end in contact with a spring plate 159 and the other end in contact with a plug 161 that seals the inner hole 155. This method of operating a pressure reducing valve is often used, so it is necessary to explain it in detail here. Probably not. Advance control device f1 (1
1 operates at a pressure lower than the normal pump pressure, for example, 50 atmospheres, so the pressure reducing valve 106 is necessary. Traditionally, pressure auxiliary sources have been used or special pressure reducing valves have been used. In the present invention, a pressure reducing valve 106 formed in a plate structure and directly integrated into the advance control device 1 (11) is provided.Pressure reducing valve 1
06 is particularly preferably integrated in the bottom 6 of the precontrol device in the form of a pressure reducing valve block 103. Pressure reducing valve block 10
The bolts necessary for fixing 3 to the housing of the precontrol device 1 are not shown here.

In summary, the invention achieves a favorable compact construction based on reliability.

[Brief explanation of the drawing]

1 is a perspective view of the advance control device according to the state of the art; FIG. 2 is a sectional view of the advance control device shown in FIG. 1 taken along line 2-2 in FIG. 4; FIG. 4 is a partial sectional side view of the advance control device shown in FIG. 2C (FIG. 2C); FIG. Partially enlarged view; FIG. 6 is a system diagram of an example of use of the advance control device shown in FIG. 1; FIG. 7 is a side view similar to FIG. 4 of the first embodiment of the advance control device according to the present invention; 8 is a detailed view of the advance control device of FIG. 7; FIG. 9 is an explanatory view of a first embodiment according to the invention similar to FIG. 7 in which only the essential parts are shown in cross section; FIG. A partial sectional view of the precontrol device of FIG. 9, seen in the direction of the arrow 39 in FIG. 9; FIG. System diagram; FIG. 12 is a sectional view of the precontrol device according to the invention shown in FIG. 11, shown largely in section; FIG. Figure 14 is a partial cross-sectional rear view, that is, a left side view in Figure 12. 1.40,100... advance control device, 2.10.66
...Housing 4.42...Operation member, 27...Longitudinal axis 34.3
6... Connection inner hole, 41.141... Pilot valve, 43.64.65.81... Mechanical connection means, 46.
...Guiding means, 51...First switching position, 52.
...Second switching position, 53...Neutral position, 68.
... Longitudinal inner hole, 70.170 ... Pump connection inner hole, 71.171 ... Tank connection inner hole, 78.178 ... Signal connection inner hole, 84 ... Spring means, A, B. ...User connection port, P...Pump connection port T...Tank connection port. (4 other people)

Claims (12)

[Claims] (1) A housing (10); At least one user connection port in the housing; One pump connection port in the housing; A tank connection port in the housing; At least a pump connection port and a tank connection port piston means provided within the housing for connecting with one user connection port; and an operating member (42) for manipulating the piston means to selectively form a fluid connection between said connection ports; and; a pilot valve (41, 141) is provided in the housing (10), and the pilot valve (41, 141) is switched by an operating member (42); A featured advance control device (40, 100). (2) The advance control device according to claim 1, characterized in that the operating means (42) switch the pilot valve (41) via a mechanical connection. (3) The advance control device according to claim 1, wherein the operating member (42) hydraulically drives the pilot valve (141). (4) The advance control device according to claim 3, wherein the pilot valve (141) is switched by pressure generated at one or more user connection ports. (5) At least two user connection ports A, B or multiple pairs of these user connection ports are provided in the housing (10); a neutral position (53) and a first switching position (51); and a second switching position (52) are provided on one side (10) of the precontrol device, and a pilot valve (141) is provided on the opposite side of the precontrol device. (9) provided on the inner hole (7) and within the housing (66).
0, 71) are provided, the bores (70, 71) being connected to bores in the housing (2) of the precontrol device, which bores, in turn, are connected to the pump connection P or to the tank connection T. The advance control device according to any one of the preceding claims. (6) The piston means (21) in the bore are arranged to be movable up and down in the bore extending parallel to the longitudinal axis (27) of the precontrol device, while the housing (41) of the pilot valve (41) 66) and the connection bore (34) in the housing (2) of the precontrol device (1).
, 36) likewise extend perpendicular to this longitudinal axis (27). (7) the pilot valve (41) has a piston (80) within the longitudinal bore (68); and a pump connection bore such that the piston outputs a hydraulic signal depending on the position of the piston (88); (70) or movable between a neutral position connecting the tank connection bore (71) with a signal connection bore (78) in the housing (66) and an operating position; Range: The advance control device according to any of the above items. (8) spring means (8) when the piston is in the neutral position;
4) movable from a neutral position to an activated position via mechanical coupling means (43, 64, 65, 81) actuated by an operating means (42); The advance control device according to any one of the above items. (9) Any of the preceding claims characterized in that the operating means (42) is guided within the guide means (46) so that the pilot valve is actuated before actuating the advance control device. The advance control device described in . (10) Claims characterized in that the pilot valve is directly incorporated into the advance control device, thereby eliminating any external signal addition influence on the pilot valve. Advance control device. (11) The advance control device according to any one of the preceding claims, characterized in that mechanical damage to the signal transmission member is eliminated by directly incorporating the pilot valve into the advance control device. (12) Claims characterized in that a pressure switch is provided in the connection plate instead of the pilot valve, and when the pressure switch reaches a certain settable pressure, an electric signal is given to the user connection port. Pre-control device according to paragraph 3.