KR101543576B1 - Auto return hydraulic cylinder with motion load control appartus - Google Patents

Abstract

The present invention relates to an automatic return hydraulic cylinder in which a piston rod is forcibly advanced by an external force and is returned by an elastic force of a return spring forcedly compressed by removal of an external force, The present invention also provides an automatic return hydraulic cylinder equipped with a motion load control unit that is integrally provided in a rod cover to maximize convenience, and is also capable of compacting a cylinder, thereby minimizing occupancy of a facility space and ensuring reliability of the product.
The above object of the present invention is achieved by providing a cylinder chamber (100) partitioned by a double chamber in which an outer tube and an inner tube are communicated with each other by a rod cover (130) and a head cover (140) A return spring 400 is provided between the piston 200 and the rod cover 130 installed in the inner chamber to elastically support the piston. The return spring 400 is elastically supported by the return spring, A check valve 350 is provided between the front side of the piston and the end of the piston rod 300 to open and close a plurality of flow paths formed in the rod 200, And the gate valve is rotated by the rotation of the hydraulic pressure adjusting cap which is rotatably assembled to the outer circumferential end of the outer tube to adjust the forward and backward degree by the degree of the cam protrusion of the inner rotary cam block Adjusting And an exercise load regulating portion for regulating the under load.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic return hydraulic cylinder having a motion load control unit,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic return hydraulic cylinder in which a piston rod is forcibly advanced by an external force and is returned by an elastic force of a return spring forcefully compressed by removal of an external force, The present invention relates to an automatic return hydraulic cylinder equipped with a load-adjusting unit, which is provided integrally with a load cover, which can be adjusted to maximize convenience and cylinder reliability, will be.

Recently, a variety of types have been disclosed for the purpose of promoting health. Such exercise apparatuses are installed in outdoor places such as a health club, a home or the like indoor or a park.

That is, the fitness exercise device is composed of various devices for performing rotational motion, up / down motion, left / right motion, or forward / backward motion according to a motion operation performed by the user.

Examples of such a fitness exercise machine include a running machine, a step machine, a cycling machine, a weight machine, and the like. The dual weight machine can be classified into a Bench Press, a Hack Squat ), Leg Press, Leg Extension, Lat Pull Down, Lying Leg Curl, and Arm Curl.

For performing back and forth movements, there are arm presses, back, chest exercises, Rongfa presses, and simchest presses.

Of the above-described exercises, leg presses, leg extensions, and the like generate exercise loads by a hydraulic cylinder as a representative exercise mechanism for enhancing the strength and flexibility of the lower body.

In other words, the above-described exercise apparatus can maximize the effect of exercise by generating optimal exercise load in accordance with different physical condition muscular strength and exercise ability for each user.

The scope of the present invention belongs to a hydraulic cylinder which generates a motion load in the above-mentioned exercise apparatus.

A large number of hydraulic cylinders applied to such a motion mechanism have also been conventionally disclosed.

For example, Patent Document 1 discloses a seam source technique disclosed by the applicant of the present invention. The seam source includes a hydraulic pressure regulating means for regulating the flow pressure of fluid circulating in the front and rear chambers partitioned by the piston of the cylinder, The control of the hydraulic pressure regulating means is intended to control the exercise load.

In this patent document 1, the load is adjusted by the forward, backward, and external force of the piston rod (including the piston) of the hydraulic cylinder, It can not be used because it does not provide an operation to apply load only in one direction like a press.

In addition, the hydraulic pressure adjusting means is provided in the vertical direction of the head cover to occupy a large installation space, and load adjustment is provided in the head cover, which is a guide member of the forward and backward operation pistons, so that the installation space is limited.

In addition, the above-described Patent Document 1 has a disadvantage in that the structure is complicated and the number of component parts increases, inviting an increase in manufacturing cost as well as complexity of the assembling process.

Patent Document 1: Korean Patent Publication No. 10-2010-0061984 (Published Date: June 10, 2010)

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a hydraulic system for a hydraulic system, And the automatic return (piston and piston rod) is possible, so that it can be applied to a fitness machine that requires a return operation of the piston like a leg press.

In order to achieve the above object,

A double chamber in which an incompressible fluid is filled in a state of being communicated with a connection passage formed in the rod cover and the head cover, the double chamber being divided into an inner chamber and an outer chamber by being sealed with a rod cover and a head cover, A cylinder chamber,

A piston installed in the inner chamber, a piston rod assembled with the piston and extended to the outside of the rod cover,

And an air tube accommodated in the outer chamber to compensate for a volume change of the piston rod due to the reciprocating movement of the piston,

And a check valve for opening / closing a plurality of flow paths formed through the piston in a state in which a return spring is elastically provided between the piston and the rod cover and is elastically supported by the return spring, And a compression spring provided between the blocking disc and the flange of the valve seat so as to be elastically provided between the flanges of the valve seat and the valve disc, ,

A gate valve for adjusting the degree of opening is assembled to the connection passage of the rod cover and the gate valve is axially assembled in an airtight state with the outer circumferential surface of the piston rod to be rotatably mounted on the outer circumferential end of the outer tube, Backward movement of the camshaft is controlled by the degree of pressing of the cam protrusion on the inner rotation cam block by the rotation of the camshaft.

As a second aspect, the gate valve includes an opening / closing plunger assembled in a valve assembly passage hole penetrating the connection passage of the rod cover to open / close the inner passage, a compression spring for elastically supporting the opening / closing plunger, An airtight plunger for supporting the airtight plunger, and a sliding ball incorporated in a ball groove of the airtight plunger.

The motion load adjusting unit may include a cam protrusion sliding on a sliding ball provided in a ball groove of the airtight plunger and a rotation having a support protrusion part formed on an opposite side of the cam protrusion to surround the outer circumferential surface of the piston rod and assembled in an air- A cam nut, a cam block, a cap nut screwed to the inner circumferential surface of the outer tube in a state where the cam protrusion of the rotary cam block is closely attached to the sliding ball and inserted into the support protrusion, and a fixing screw is fixed to the support protrusion of the rotary cam block And a hydraulic pressure adjusting cap assembled to be rotatable around the outer circumferential surface of the end portion of the outer tube.

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According to the present invention, a load cover for providing internal airtightness according to forward and backward movement of a piston rod is provided with a motion load control unit in a hydraulic cylinder in a unitary concept, thereby minimizing the overall volume and ensuring installation convenience in the applied equipment .

In addition, according to the present invention, it is possible to provide the exercise load control portion in a simple assembling configuration, and industrially, a mass production effect can be expected, and it is possible to provide at low cost.

1 is a longitudinal sectional view of an automatic return hydraulic cylinder to which the present invention is applied.
Fig. 2 is an enlarged view of a portion of the rod cover portion of Fig. 1;
Fig. 3 is an enlarged view of the head cover portion of Fig. 1; Fig.
4 is a rear perspective view of a head cover which is a constituent member of the present invention.
Fig. 5 is an exploded perspective view of the backward direction of a member constituting the exercise load adjusting portion, which is a main technique of the present invention.
6 is a frontal exploded perspective view showing the assembled state of the rod cover which is a constituent member of the present invention and the gate valve and the rotating cam block constituting the motion load adjusting portion.
7 is a cross-sectional view and a front view showing a configuration of a rod cover which is a component of the present invention at the same time.
FIG. 8 is a view showing a front view and a side view of a rotating cam block which is a component of the present invention at the same time, and shows a difference in thickness between the start end and the end end of the cam protrusion.
9 is an exploded perspective view of a check valve that opens and closes a flow path of a piston which is a component of the present invention.
10 and 11 are diagrams illustrating an operation of an automatic return hydraulic cylinder to which the present invention is applied.
10 is a forward operation view of the piston rod showing the flow of hydraulic pressure due to forward (pulling) of the piston rod,
11 is a backward operation view of the piston rod showing the flow of the hydraulic pressure due to the backward (return) of the piston rod.

The present invention is characterized in that the load cover is provided integrally with the load cover and includes a motion load adjusting unit that can easily control the load caused by the user by the user.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The structure and size of the constituent elements shown in the drawings can be simplified or simplified as long as they do not interfere with the description of the present invention.

The present invention relates to a cylinder assembly including a cylinder chamber 100, a piston 200 accommodated in the cylinder chamber, a piston rod 300 assembled with the piston, And a constituent element of the air tube 500 which is compressive compensation means accommodated in the cylinder chamber 100.

1, the cylinder chamber 100 includes a rod cover 130 and a head cover 140 assembled to both sides of the outer tube 110 and the inner tube 120, The incompressible fluid is filled in a state of being partitioned by the double chamber of the inner chamber (102).

2 to 4 and 7, the rod cover 130 and the head cover 140 may be formed in the shape of an O-ring groove formed in the outer circumferential surface in a state in which the respective connecting flow paths 131 and 141 are machined, (O / R) to the outer tube 110 and airtightly assembled on both sides of the outer tube 110.

The rod cover 130 and the head cover 140 are provided with a shaft connection portion that is axially coupled to the motion mechanism.

The head cover 140 is hermetically sealed by threaded assembly with stepped screw grooves machined on the inner circumferential surface of the end tube of the outer tube and the rod cover 130 is inserted into the stepped groove of the outer tube 110, 190).

In this assembly, the inner tube 120 is inserted into the stepped grooves 132 and 142 formed in the rod cover 130 and the head cover 140 assembled to the outer tube 110, Tightly assembled by screwing the cover 130 and the head cover 140 together.

The inner tube 120 is partitioned into front and rear chambers A and B by a piston 200 assembled to the rear end of the piston rod 300. The front and rear chambers are connected to the rear side of the piston 200, The incompletely filled incompressible fluid as the volume is changed by the forward and backward movement is transmitted to the front chamber A of the inner chamber 102 through the connecting flow paths 131 and 141 of the rod cover 130 and the head cover 140 Is circulated to the rear chamber (B) through the outer chamber (101), and then circulated to the front chamber (A) through the plurality of flow passages (210) penetrating the piston (200).

The volume change of the piston rod 300 due to the advancement (pulling) of the piston 200 and the piston rod 300 is controlled by the air tube 500 accommodated in the outer chamber 101 by circulating the incompressible fluid And compensates for the expansion / contraction of the air tube 500 accommodated in the outer chamber 101 by the volume loss and the increase in the volume of the piston 200 due to the forward / backward movement of the piston rod 300, The forward and backward movement of the piston rod 300 is provided.

3 and 9, the piston 200 is inserted into a threaded rod 310 having a small diameter at the rear end of the piston rod 300 and is fastened to a fastening nut 340 screwed to the threaded rod Thereby being assembled with the departure prevention.

A check valve 350 for opening and closing the flow passage 210 of the piston 200 is assembled to the screw rod 310 formed at the end of the piston 200 and the piston rod 300.

The check valve 350 includes a valve seat 351 which is in close contact with a step 330 formed by the screw rod 310 and the large diameter rod 320 of the piston rod 300, And a compression spring 353 elastically provided between the blocking disc and the flange of the valve seat 351. The compression spring 353 is provided between the blocking disc 351 and the flange of the valve seat 351.

In the check valve 350, the passage hole 210 of the piston 200 is blocked by the elastic force of the compression spring 353. Accordingly, when the piston 200 is advanced, the compressive force of the incompressible fluid is increased to block the movement of the incompressible fluid into the rear chamber B, and when the piston moves back to the rear chamber B, The blocking disk 352 opens the milli-passageway hole 210 at a time when the compression spring 353 has a maximum elasticity.

7, the connection passage 131 of the rod cover 130 includes an inner passage hole 131a connected to the inner chamber 102, and an inner passage hole 131a connected to the inner passage hole, And a connecting channel which is connected to the outer circumferential surface of the rod cover 130 and is connected to the outer chamber 101 by a connecting channel extending in two stages, And an outer flow path 131c.

The gate valve 150 includes an opening / closing plunger 151 assembled to the valve assembly channel 131b of the connection channel 131 to open / close the inner channel 131a, and a compression spring An airtight plunger 153 for supporting the rear end of the compression spring, and a sliding ball 154 assembled to the ball groove of the airtight plunger.

The gate valve 150 is axially assembled in an airtight state with the outer circumferential surface of the piston rod 300 and is rotated by the rotation of the hydraulic pressure control cap 180 which is rotatably assembled to the outer circumferential end of the outer tube 110, The cam block 170 is constituted by a motion load adjusting unit 160 for adjusting the flow force of the incompressible fluid flowing through the connecting passage 131 of the rod cover 130 by the pressing of the cam protrusion 171.

As shown in FIGS. 5, 6, and 8, the protruding cam protrusions 171 of the rotation cam block 170 constituting the motion-force adjusting portion 160 are concentrically arranged from the tip to the tip, The stopper bolt 175 is inserted into the rotation restricting groove 135 of the rod cover 130 and inserted into the rotation restricting groove 135, The rotation of the cap 170 is limited within the range of the rotation restricting groove 135.

At this time, it is preferable that the rotation restricting groove 135 is formed within a range that does not interfere with (invade) the valve assembly channel 131b.

The rotation cam block 170 includes a cap nut 190 screwed to the inner circumferential surface of the outer tube 110 while the cam protrusion 171 is slidably supported on the sliding ball 164 of the gate valve 150, So as to be able to rotate by departure prevention.

That is, the rod cover 130 is tightly fitted to the inner circumferential surface of the outer tube 110 by the screw tightening of the cap nut 190.

The hydraulic control cap 180 is fixed to the support protrusion 172 of the rotation cam block 170 by a setting screw S and assembled to be rotatable around the outer circumferential surface of the end portion of the outer tube 110.

It is a matter of course that the rod cover 130 and the rotary cam block 170 are assembled in an airtight state by airtight sealing such as packing, o-ring, or the like for airtightness with the outer peripheral surface of the piston rod 300, It is a well-known technology in the industry, and detailed explanation will be omitted.

The motion load adjusting unit 160 is configured such that the cam protrusion 171 of the rotary cam block 170 presses the sliding ball 154 constituting the gate valve 150 in accordance with the rotation of the hydraulic pressure adjusting cap 170 Closing plunger 151 is compressed / relaxed by compression / expansion of the compression spring 152 by forward / backward movement of the airtight plunger 153 by releasing the pressure, and the incompressible fluid The strength of the pulling force of the piston rod 300 is adjusted.

In the present invention, the core technology is to provide the motion load adjusting unit 160 on the rod cover 130 that hermetically seals the piston rod 300 so that the entire volume of the rod cover 130 can be reduced, The exercise load can be adjusted quickly by operation.

10, when the piston 200 is pulled forward due to the pulling of the piston rod 300, the compressive force of the incompressible fluid filled in the front chamber A causes the compression of the check valve 350 The incompressible fluid of the front chamber A which is compressed at the same time as the blocking disk 352 advances while closely contacting the blocking disk 352 passes through the connection chamber 131 of the rod cover 130 from the outer chamber 101 to the head cover 140 To the rear chamber (B) of the inner chamber (102).

At this time, the cam protrusion 171 of the rotation cam block 170 rotates in accordance with the rotation of the hydraulic pressure regulating cap 180 by the elasticity of the compression spring 152 by the opening degree of the opening / closing plunger 152 151 can adjust the opening force easily to adjust the exercise load.

11, the return spring 400, which is compressed by advancing the piston 300, is expanded by the removal of the external force that advances the piston rod 300, The incompressible fluid filled in the rear chamber B at the same time as the return spring 351 is returned from the blocking disc 352 which is in close contact with the plurality of flowpaths 210 at a point above the maximum elastic force of the compression spring 353 of the check valve 350 And moves to the front chamber (A) to provide a backward movement of the piston (200).

Although the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims as well as the appended claims.

The present invention can be applied to a fitness device such as a leg press requiring the generation of a motion load, and can be very usefully used for adjusting the optimal exercise load according to different physical condition muscular strength and exercise ability for each user.

100: cylinder chamber 110: outer chamber
120: inner chamber 150: gate valve
160: motion load adjustment unit 170: rotation cam disc
180: Hydraulic control cap 190: Cap nut
200: Piston 300: Piston rod
400: return spring 500: air tube

Claims (6)

A double chamber in which an incompressible fluid is filled in a state of being communicated with a connection passage formed in the rod cover and the head cover, the double chamber being divided into an inner chamber and an outer chamber by being sealed with a rod cover and a head cover, A cylinder chamber,
A piston installed in the inner chamber, a piston rod assembled with the piston and extended to the outside of the rod cover,
And an air tube accommodated in the outer chamber to compensate for a volume change of the piston rod due to the reciprocating movement of the piston,
A check valve is provided for opening and closing a plurality of flow paths formed through the piston in a state in which a return spring is elastically provided between the piston and the rod cover and is elastically supported by the return spring, And a compression spring provided between the blocking disc and the flange of the valve seat so as to be elastically provided between the flanges of the valve seat and the valve disc, ,
A gate valve for adjusting the degree of opening is assembled to the connection passage of the rod cover and the gate valve is axially assembled in an airtight state with the outer circumferential surface of the piston rod to be rotatably mounted on the outer circumferential end of the outer tube, Wherein the motion regulating portion is configured to regulate the degree of forward and backward movement of the inner rotation cam block by the degree of the urging of the cam protrusion.
The method according to claim 1,
Wherein the cam protrusion of the rotation cam block protrudes in a concentric manner from the tip to the tip gradually increasing in thickness so that the stopper bolt is assembled to the maximum thickness portion, Wherein the hydraulic pressure regulating cap is configured to limit the rotation of the hydraulic pressure adjusting cap in a state of being inserted and coupled.
The method according to claim 1,
A valve assembly passage hole connected to the inner passage hole and connected to the valve assembly passage hole and connected to the outer circumferential surface of the rod cover, And an outer passage communicated at one side with the outer chamber by an extended connecting passage.
The method of claim 3,
Wherein the gate valve includes an opening / closing plunger assembled in a valve assembly channel communicating with the connection passage of the rod cover, a compression spring elastically supporting the opening / closing plunger, a hermetic plunger supporting a rear end of the compression spring, And an assembled sliding ball. The automatic return hydraulic cylinder with the motion load adjusting unit.
The method according to claim 1 or 4,
Wherein the rotation cam block is rotatably assembled with a cap nut that is screwed to an inner circumferential surface of the outer tube by closely supporting a cam protrusion on a sliding ball interposed in a ball groove of the airtight plunger, And the hydraulic pressure adjusting cap is fixed to the support protrusion part which surrounds the outer circumferential surface and is assembled in an airtight state by a setting screw so as to be rotatable around the outer circumferential surface of the end part of the outer tube.
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