JPH0687601U - Piston reciprocating pneumatic motor for hydraulic system - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pneumatic motor that is easy to assemble without providing an external gas circuit. [Structure] Cylinder 1, cylinder head 2, cylinder bottom cover 3 and piston assembly 4
A guide groove 11 parallel to the center line is provided in the middle of the inner surface of the piston assembly 4, and a piston assembly 4 is provided with a shuttle valve 46 slidably held on the center line of the piston body 4a. The repulsed piston assembly 4 moves downward by the supply of air, and the shuttle valve 46 is pushed up by the air that has passed through the guide groove 11 at the lower end.
An air exhaust circuit is formed, the piston assembly 4 moves up by the spring 52, returns to the initial position, and becomes one cycle, and this cycle is repeated continuously while air is supplied.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive source of a hydraulic pressure generator of a hydraulic system.

[0002]

[Prior art]

 An example of a pneumatic motor used in conventional large jacks is usually composed of parts such as a cylinder head, a cylinder, a first piston sleeve, a second piston sleeve, a piston body, and a piston rod. When air is supplied, the piston is pushed down, and when air is cut off, the piston is pushed up by the repulsive force of the spring, and this vertical movement drives the hydraulic pump.

However, in this example, the air to be supplied needs to be interrupted, and an air interrupting device is required. Therefore, as a device that improves this point, an external ring pipe or the like between the cylinder and the cylinder base is provided. A circuit had to be provided and connected.

[0004]

[Problems to be solved by the device]

 The pneumatic motor described above requires a gas circuit component such as an outer ring pipe on the outside of the cylinder, which has a problem that the structure is complicated and the assembling work is difficult.

An object of the present invention is to solve the above problems and provide a pneumatic motor that is easy to assemble and has no external parts.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a drive device in a hydraulic pressure generating device for a hydraulic device includes a cylinder 1, a cylinder head 2, a cylinder bottom cover 3, and a piston assembly 4.

The cylinder 1 is provided with a guide groove 11 which is recessed in the middle portion in parallel with the central axis, the cylinder head 2 is provided with an air supply hole 23, and the cylinder bottom cover 3 is provided with the central axis along the central axis. A piston assembly 4 including a pump cylinder 33, a pump head 35, a piston rod 5, a spring 52, and a spring base 51, and an L-shaped vent hole 34 communicating from the inner surface to the side surface are provided.

The piston assembly 4 is composed of a piston body 4 a, a shuttle valve 46, and a ring stopper 42 formed by resin ultrasonic coupling, and the piston body 4 a has a first bottomed cylinder 48 bored from the upper side along the central axis. And a second bottomed cylinder 43 that is further formed in the bottom of the first bottomed cylinder 48, and an exhaust hole 45 that penetrates from the bottom of the first bottomed cylinder 48 to the lower surface of the piston body 4 a. , An air supply hole 44 penetrating from a position in contact with the bottom of the side surface of the second bottomed cylinder 43 to a cylindrical space 412 on the outer circumference of the piston body 4a, and adjacent to the upper and lower end portions of the outer circumference. The first and second ring grooves 411, 411a in which the second airtight rings 41, 41a are fitted and the middle portion are formed so that a cylindrical space 412 is formed between the first and second ring grooves 411, 411a and the cylinder 1 with an outer diameter smaller than both ends. ing .

The shuttle valve 46 has a seal member 461 that keeps airtight between the shuttle valve 46 and the inner surface of the cylinder when sliding in the second bottomed cylinder 43 along the central axis, and a third airtight member held at the tip. And a ring stopper 421, the ring stopper 42 has an outer circumference fitted to the first bottomed cylinder 48, a shaft portion of the shuttle valve 46 penetrates through the center thereof, and is closed by a third airtight ring 421. A central hole is formed.

The cylinder head 2, the cylinder 1, and the cylinder bottom cover 3 described above are fixed along the central axis by four bolts 21.

[0011]

[Action]

 When air is supplied from the air supply hole 23, the piston assembly 4 is pressed and retracts, and when the first airtight ring 41 moves to the position of the guide groove 11 of the cylinder 1, the air passes through the cylindrical space 412 and the air supply hole 44. Then, it flows into the shuttle compression chamber 47, pushes up the shuttle valve 46, releases the airtightness between the third airtight ring 421 and the ring stopper 42, and discharges the air directly from the L-shaped vent hole 34.

As a result, the piston assembly 4 is advanced by the spring 52 to return to the original position, and the above operation is repeated again. For this reason, the piston rod 5 also reciprocates, and the hydraulic pump connected to it operates to generate hydraulic pressure.

[0013]

【Example】

 1 is an exploded perspective view of a pneumatic motor of the present invention, FIGS. 2 to 5 are sectional views, FIG. 2 is a state diagram before the start of operation, and a state diagram showing one cycle of operation according to FIGS. FIG. 6 is a perspective view of a hydraulic device using the pneumatic motor of the present invention.

The piston reciprocating pneumatic motor of the present invention comprises a cylinder 1, a cylinder head 2, a cylinder bottom cover 3, and a piston assembly 4.

A guide groove 11 is formed in the cylinder 1 in the middle of the inner surface parallel to the central axis, and an air supply hole 23 is formed in the cylinder head 2. Further, the cylinder head 2 is provided with bolt holes 22 through which bolts 21 for assembling and fixing the whole are fixed at four corners.

The cylinder bottom cover 3 has a central hole 32 for fixing the pump assembly at the center and bolt holes 31 at the four corners corresponding to the bolt holes 22 of the cylinder head 2, and communicates from the inner surface to the side surfaces. An L-shaped ventilation hole 34 is formed.

The piston assembly comprises a pump cylinder 33, a pump head 35, a piston rod 5, a spring 52, and a spring base 51 along the central axis. The piston rod 5 is inserted into the center hole of the pump cylinder 33 from above. The piston rod 5 is provided with a spring base 51 at the upper end, and is elastically pressed by the spring 52 from the cylinder bottom cover 3 to the lower face of the piston assembly 4, and the lower end penetrates the pump head 35, the sleeve 331, and the O-ring 332. Is inserted into the pump cylinder 33.

The piston assembly 4 has a pump head 35 screwed into the upper end of the pump cylinder 33 and a hexagonal nut 335 screwed into the middle of the piston assembly 4, and is penetrated through the central bore 32 of the cylinder bottom cover 3. It is fixed so as to be sandwiched between.

A screw portion provided with a rectangular oil seal 333 and a washer 334 is formed at an end portion on the opposite side of the pump cylinder 33 so as to be connected to an external hydraulic circuit.

The piston assembly 4 is composed of a piston body 4 a, a shuttle valve 46, and a ring stopper 42 formed by resin ultrasonic coupling.

On the upper surface of the piston body 4 a, a first bottomed cylinder 48 is provided which is bored from above along the central axis, and a second bottomed cylinder 43 is coaxially arranged on the bottom of the first bottomed cylinder 48. And an exhaust hole 45 penetrating from the bottom of the first bottomed cylinder 48 to the lower surface of the piston body 4a.

The outer circumference of the piston body 4a is adjacent to the upper and lower ends, and the first and second ring grooves 411 and 411a into which the first and second airtight rings 41 and 41a are fitted and the middle portion are smaller than the both ends. A cylindrical space 412 is formed between the cylinder 1 and the cylinder 1 in diameter. Further, an air supply hole 44 is bored from a position in contact with the bottom of the side surface of the second bottomed cylinder 43 to a cylindrical space 412 on the outer circumference.

The shuttle valve 46 is composed of a large diameter portion on the lower side and a small diameter portion on the upper side. The large-diameter portion is configured to slide in the second bottomed cylinder 43 along the central axis, and a sealing material 461 that holds airtightly between the large-diameter portion and the inner surface of the cylinder is held on the outer periphery of this portion.

The small diameter portion passes through the center hole of the ring stopper 42 fitted in the first bottomed cylinder 48, and the third airtight ring 421 is held at the upper position.

The ring stopper 42 has an outer periphery that fits into the first bottomed cylinder 48, and a center hole having a size that allows the small diameter portion of the shuttle valve 46 to penetrate therethrough and be closed by the third airtight ring 421. It is set up. Further, the surface facing the first bottomed cylinder 48 is an annular protrusion so that only the peripheral portion is in contact, and a gap 422 is formed between the inside and the bottom surface of the first bottomed cylinder 48.

The cylinder head 2, the cylinder 1, and the cylinder bottom cover 3 are fixed along the central axis by four bolts 21 to form an integral pneumatic motor.

Next, the operation of the above pneumatic motor will be described. FIG. 2 is a state diagram before operation. The piston assembly 4 is elastically pressed in the direction of the cylinder head 2 by the spring 52, the inner volume of the cylinder 1 on the cylinder head 2 side is the minimum, and the inner wall of the cylinder 1 and the first Airtightness is maintained between the airtight rings 41 and between the ring stopper 42 and the third airtight ring 421.

When air is supplied from the air supply hole 23 in this state, the piston assembly 4 moves backward against the elastic force of the spring 52, and the state shown in FIG. 3 is obtained. In this state, the inside of the cylinder 1 is still airtight.

When further retracted to the state of FIG. 4, a space between the inner surface of the cylinder 1 on the cylinder bottom cover 3 side and the second airtight ring 41a becomes airtight, and the first airtight ring 41 is attached to the guide groove 11 of the cylinder 1. Since the internal volume on the cylinder head 2 side of the cylinder 1 is reached, the small diameter portion of the outer circumference of the piston body 4a, the air supply hole 44 and the shuttle compression chamber 47 at the bottom of the second bottomed cylinder 43 are in communication with each other and supplied. The shuttle valve 46 is moved forward by air, and a ventilation state is established between the ring stopper 42 and the third airtight ring 421.

Therefore, as shown by the arrow in FIG. 4, the air is exhausted through the L-shaped vent hole 34 of the cylinder bottom cover 3, the piston assembly 4 loses the pressing force against the spring 52, and the elastic force of the spring 52 makes it possible. It is pressed against the cylinder head 2. This state is shown in FIG.

In this case, the tip of the shuttle valve 46 is pushed back by the cylinder head 2 and the air in the shuttle compression chamber 47 is supplied to the air supply hole 44 and the space of the cylinder bottom cover 3 of the cylinder 1 as shown by the arrow in FIG. And is exhausted through the L-shaped ventilation holes 34. This exhausted state is the initial state shown in FIG. 2, and up to this state is one cycle.

After that, as long as the supply of air continues, the above cycle is repeated. As a result, the piston rod 5 moves up and down, the internal volume of the pump cylinder 33 changes periodically, and the operation of the hydraulic pump (not shown) continues. It

[0033]

[Effect of device]

 As described above, since the guide groove 11 is formed integrally with the inner surface of the middle of the cylinder 1, there is no need for an external circuit for continuing the reciprocating motion of the piston assembly 4, and the device is simplified. Therefore, the assembly work and maintenance work of the device are also simplified.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a pneumatic motor of the present invention.

FIG. 2 is a cross-sectional view of a state before the start of operation.

FIG. 3 is a cross-sectional view showing a state during the operation.

FIG. 4 is a cross-sectional view showing a state during the operation.

FIG. 5 is a cross-sectional view of a state at the end of one cycle.

FIG. 6 is a perspective view of a hydraulic device using the pneumatic motor of the present invention.

[Explanation of symbols]

 1 Cylinder 11 Guide Groove 2 Cylinder Head 23 Air Supply Hole 3 Cylinder Bottom Lid 32 Medium Hole 33 Pump Cylinder 34 L-Shaped Vent 35 Pump Head 4 Piston Assembly 41 First Airtight Ring 41a Second Airtight Ring 42 Ring Spare 421 Third Airtight Ring 43 second cylinder with bottom 44 air supply hole 45 exhaust hole 46 shuttle valve 47 shuttle compression chamber 48 first bottomed cylinder 5 piston rod 51 spring base 52 spring

Claims (1)

[Scope of utility model registration request] 1. A drive device in a hydraulic pressure generating device for a hydraulic device, comprising a cylinder, a cylinder head, a cylinder bottom lid, and a piston assembly, wherein the cylinder is provided with a concave portion in an intermediate portion in parallel with a central axis. A guide groove is provided, the cylinder head is provided with an air supply hole, and the cylinder bottom cover is provided with a pump cylinder along a central axis,
The piston assembly includes a pump head, a piston rod, a spring, and a spring base, and an L-shaped ventilation hole that communicates from the inner surface to the side surface. The piston assembly is a ring formed by a viston body, a shuttle valve, and resin ultrasonic coupling. A stopper body, the piston body is a first bottomed cylinder bored from above along the central axis,
A second bottomed cylinder that is further formed in the bottom of the first bottomed cylinder, an exhaust hole that penetrates from the bottom of the first bottomed cylinder to the lower surface of the piston body, and the second bottomed cylinder. And a first and second airtight rings that are fitted adjacent to the upper and lower end portions of the outer periphery of the piston body, from the position in contact with the bottom of the side face to the cylindrical space of the outer periphery of the piston body. The second ring groove and the intermediate portion are configured such that a cylindrical space is formed between the cylinder and the cylinder having an outer diameter smaller than both ends,
The shuttle valve is provided with a sealing material that maintains airtightness between the inner surface of the second bottom cylinder and the inner surface of the cylinder when sliding along the central axis in the second bottom cylinder, and a third airtight ring held at the tip. An outer periphery of the ring stopper is fitted into the first bottomed cylinder, and a central hole having a size that allows the shaft portion of the shuttle valve to penetrate therethrough and can be closed by a third airtight ring is formed. A piston reciprocating pneumatic motor for a hydraulic system, characterized in that the cylinder head, the cylinder, and the cylinder bottom lid are fixed along the central axis with four bolts.