JPH04131568U - Pneumatic pressure booster - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify and downsize the stroke detection mechanism of the power piston in a pneumatic pressure booster. [Structure] In a pneumatic-hydraulic pressure booster 1 consisting of a power cylinder part 2 and a hydraulic cylinder part 3 for converting pneumatic pressure into hydraulic pressure, the material of the cylinder 31 of the hydraulic cylinder 30 is a lightweight non-magnetic material. , the hydraulic piston 32 is made of a magnetic material, and magnetic sensing type proximity switch means 33, 34 are arranged at predetermined positions of the cylinder, and the power piston 5 of the power cylinder section is connected to the hydraulic piston 32 via the hydraulic piston. Detect strokes.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on pneumatic and hydraulic pressure used, for example, in clutch systems and brake systems of automobiles. Regarding booster.

0002

[Conventional technology]

Conventionally, as this type of pneumatic pressure booster, there is one shown in FIG. 4, for example. Same figure According to , this pneumatic pressure booster 1 increases the power of the pneumatic system in order to convert pneumatic pressure into hydraulic pressure. It consists of a cylinder part 2 and a hydraulic cylinder part 3 of a hydraulic system.

0003 This power cylinder part 2 is a power cylinder inserted into a pneumatic cylinder 4 so as to be able to reciprocate. - The movement of the piston 5 is controlled by the fluid in the hydraulic cylinder section 3 via its piston rod 6. The signal is transmitted to a hydraulic piston 8 inserted into the pressure cylinder 7 so as to be able to reciprocate.

0004 The power piston 5 is activated when compressed air is introduced into the pressure chamber 9 of the pneumatic cylinder 4. When the compressed air moves forward in the direction of arrow a and is discharged, the return air provided in the atmospheric chamber 10 Due to the urging force of the tie spring 11, it moves back in the direction of arrow b.

[0005] In addition, the liquid chamber 12 formed by the hydraulic cylinder 7 and the hydraulic piston 8 is At this time, a liquid (usually an oil liquid) is supplied from the reservoir 13, and the power piston A hydraulic piston 8 interlocked with the cylinder 5 generates and outputs hydraulic pressure (usually oil pressure).

[0006] By the way, there is a stroke for detecting the forward stroke of the power piston 5. The low-low detection mechanism 20 includes a rod 21, a return spring 22, a spring holding part 23, and a limiter. It consists of a switch 24. This detection mechanism 20 includes a power piston 5 as shown in the figure. As the rod 21 moves forward, the rod 21 is pushed against the urging force of the return spring 22, and the power pin The switch is inserted into the recess 21a provided at a position corresponding to the predetermined stroke of the stone 5. The operating end 24a of the switch 24 is engaged to operate the switch 24, and the straw is detected.

[0007]

[Problem that the idea aims to solve]

However, the stroke detection mechanism 20 is larger than the power cylinder section 2. Because it protrudes, for example, when mounting it on an automobile, it will not be possible to install it in the mounting space or mounting parts. There have been problems in that there are significant limitations and the cost is high.

[0008] The present invention was devised in view of these points, and its purpose is to solve the above-mentioned problems and to To provide a pneumatic-hydraulic pressure booster with a simple low-flow detection mechanism, small size, and low cost. be.

[0009]

[Means to solve the problem]

The configuration of the present invention to achieve the above object uses power to convert pneumatic pressure to hydraulic pressure. - Consists of a cylinder part and a hydraulic cylinder part, the power cylinder part and the hydraulic cylinder part A power piston and a hydraulic piston are reciprocatably arranged inside each of the pistons. , are connected to each other by a piston rod, and the air pressure input to the power cylinder section is In the pneumatic pressure booster that outputs hydraulic pressure from the hydraulic cylinder section, the hydraulic pressure If the material of the cylinder part is made of non-magnetic material and that of the hydraulic piston is made of magnetic material, In both cases, a magnetic sensing type proximity switch means is arranged at a predetermined location of the cylinder, and the switch detecting the hydraulic piston by means of the switching means, and detecting the stroke of the power piston. It is characterized by detecting.

0010

[Effect]

Since the present invention is constructed as explained above, the magnetic sensing type proximity switch can be operated easily. The stage allows the position of the hydraulic piston to be detected.

[0011]

【Example】

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. 1 and 2 show an embodiment of the pneumatic pressure booster of the present invention, and FIG. 1 shows the device. FIG. 2 is an enlarged view of part A in FIG. 1, and is an installation diagram of the magnetic sensor. In Figure 1 4, the same members as those in FIG. 4 are designated by the same reference numerals and their explanations will be omitted.

0012 In the same figure, the movement of the power piston 5 of the power cylinder section 2 is expressed as follows. A non-magnetic material, such as a lightweight aluminum material, of the hydraulic cylinder portion 30 is inserted through the connecting rod 6. A magnetic material, for example, an iron-based material, is disposed so as to be able to reciprocate within the hydraulic cylinder 31. The hydraulic pressure is transmitted to the hydraulic piston 32 consisting of

[0013] The hydraulic cylinder 31 corresponds to a predetermined stroke of the power piston 5. A magnetic sensor 33 is screwed to the position where the sensor 33 is connected. Outputs an ON or OFF signal to the outside via the controller 34, and displays the A light 35 indicates the stroke of the power piston 5.

[0014] This magnetic sensor 33 includes a magnetoelectric transducer 34, a nonmagnetic material 35, and a permanent magnet. It consists of a stone 36, which is integrally molded with synthetic resin, and is placed at the location of the hydraulic cylinder 31. It is screwed into a non-penetrating screw hole 31a drilled at a fixed position.

[0015] The magnetoelectric conversion element 34 of the sensor 33 is connected to the hydraulic piston 32 made of a magnetic material. approaches, its output voltage increases due to the Hall effect, and this output voltage is sent to the controller 34 via the lead wire 37 as a detection signal, and the hydraulic piston The position of the button 32 is being detected.

[0016] FIG. 3 shows another embodiment of the present invention, in which a magnetic sensing device replaces the magnetic sensor 33 of FIG. FIG. 3 is a sectional view of the contact switch. This magnetic sensing type proximity switch 40 has a fixed contact portion 4 1, a movable part 43 made of a magnetic material or a magnet to which a movable contact 42 is fixed, and a return The spring 44 is integrally molded from synthetic resin, and is attached to the hydraulic cylinder 31. It is screwed into a non-penetrating screw hole 31a provided at a predetermined position.

[0017] On the other hand, a permanent magnet 45 is disposed on the sliding side surface of the hydraulic piston 32, and the liquid As the pressure piston 32 approaches, the spring 44 returns the movable part 43 of the proximity switch 40. The movable contact 42 is moved toward the fixed contact portion 41 by operating it in the suction direction against the urging force of contact, outputting a contact closure via lead 46 and indicating the position of hydraulic piston 32. is being detected.

[0018] In addition, the conventional stroke detection mechanism 20 is eliminated, and the hydraulic cylinder section 3 The hydraulic cylinder 31 of 0 is made of lightweight, non-magnetic material such as aluminum material. The pneumatic pressure booster has the advantage of being lightweight.

[0019] Note that the technology of the present invention is not limited to the technology in the above embodiments, but Means of other embodiments having various functions may also be used, and the technology of the present invention can be applied to the above-mentioned configuration. Various changes and additions are possible within the range.

[0020]

[Effect of the idea]

As is clear from the above explanation, according to the pneumatic pressure booster of the present invention, the hydraulic cylinder In addition to using a non-magnetic material for the cylinder and a magnetic material for the hydraulic piston, A magnetic sensing type proximity switch means is disposed at a predetermined location of the cylinder, and the hydraulic piston The stroke of the power piston in the power cylinder section is detected through the As a result, the number of parts used is considerably reduced, and the entire stroke detection mechanism is It can be simplified, downsized, and lowered in cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the pneumatic pressure booster of the present invention.

FIG. 2 is an enlarged cross-sectional view of the magnetic sensing sensor in section A of FIG. 1;

FIG. 3 is a sectional view of a magnetic sensing type proximity switch showing another embodiment of the present invention, corresponding to FIG. 2;

FIG. 4 is a sectional view of a conventional pneumatic pressure booster.

[Explanation of symbols]

2 Power cylinder part 5 Power Piston 30 Hydraulic cylinder part 31 Hydraulic cylinder 32 Hydraulic piston 33 Magnetic sensor 34 Controller 40 Magnetic sensing type proximity switch

Claims (1)

[Scope of utility model registration request] Claim 1: A power piston comprising a power cylinder section and a hydraulic cylinder section for converting air pressure into hydraulic pressure, and is reciprocatably disposed inside each of the power cylinder section and the hydraulic cylinder section. and a hydraulic piston are connected to each other by a piston rod, and the pneumatic pressure input to the power cylinder section is output as hydraulic pressure from the hydraulic cylinder section, wherein the material of the cylinder of the hydraulic cylinder section is In addition to making the hydraulic piston a non-magnetic material and a magnetic material for the hydraulic piston,
A pneumatic-hydraulic pressure booster characterized in that a magnetic sensing type proximity switch means is disposed at a predetermined location of the cylinder, and the switch means detects the hydraulic piston to detect the stroke of the power piston.