JP4787537B2 - Cylinder device - Google Patents

Description

  The present invention relates to a cylinder device.

  In the conventional cylinder device, the applicant proposes, for example, a bidirectional discharge pump such as a gear pump, a cylinder, and a cylinder circuit that connects the bidirectional discharge pump and the cylinder. In order to hold the cylinder in a locked state, a pair of electromagnetic on-off valves are provided in the middle of the cylinder circuit (see, for example, Patent Document 1).

As shown in FIG. 2, for example, a cylinder circuit 104 is provided in a block 103 connecting the cylinder 100 and the bidirectional discharge pump 101, and the block 103 is further embodied. Are provided with the above-described electromagnetic on-off valves 105 and 106.

  However, the above-described conventional embodiment of the cylinder device does not have a functional problem, but has the following disadvantages.

That is, in the conventional cylinder device, the cylinder 100 and the bidirectional discharge pump 101 are connected by the block 103, and the electromagnetic on-off valves 105 and 106 are provided in the block 103. When mounting, the distance from the center line of the cylinder, which is the line connecting the mounting parts at both ends, to the hydraulic pressure source becomes far and the device vibrates. There is a risk of interference with other members.

  In addition, as described above, in the conventional cylinder device, the width in the short direction of the cylinder device is larger than the presence of the block 103, so that attachment may not be possible depending on equipment with a limited installation space.

  Accordingly, the present invention has been developed to improve the above-described adverse effects, and an object of the present invention is to provide a compact cylinder device.

To achieve the above object, the present invention provides liquid supply cylinder, the selectively hydraulically two pressure chambers formed in the cylinder through the cylinder circuit communicating with two pressure chambers above and pressure source, the pressure chambers provided in the middle of the cylinder circuit and a pair of solenoid valves to lock respectively, a valve body each electromagnetic on-off valve is away seated on the valve seat, the valve body on the valve seat In a cylinder device comprising an urging spring that urges toward the valve and a solenoid that applies thrust to the valve body in a direction against the urging force of the urging spring when applied , the electromagnetic on-off valve is housed in a valve case The valve case and the hydraulic pressure source are directly attached to the outer periphery of the cylinder .

  According to the present invention, the distance between the center line of the cylinder, which is a line connecting the mounting portions of the cylinder device, and the hydraulic pressure source is shorter than that of the conventional cylinder device, that is, the cylinder device is made compact. Can do.

  Therefore, in this cylinder device, since the amount of shaking of the cylinder device when the device vibrates is small, the possibility of interference with members on the device side is reduced.

  Further, as described above, since it is more compact than the conventional cylinder device, the mountability to equipment with a limited mounting space is also improved.

  Further, since the center of gravity of the cylinder device can be set in the vicinity of the center line of the cylinder, the moment of inertia of the cylinder device can be reduced, so that the deflection of the cylinder device can be terminated earlier than the conventional cylinder device. At the same time, it is possible to reduce the adverse effect that the inertial force due to the vibration of the cylinder device acts on the device side.

  The present invention will be described below based on the illustrated embodiment. FIG. 1 is a cross-sectional view of a cylinder device according to an embodiment.

  As shown in FIG. 1, the basic structure of the cylinder device S in one embodiment includes a cylinder 1, two pressure chambers R <b> 1 and R <b> 2 separated by a piston P in the cylinder 1, and each of the pressure chambers R <b> 1 and R <b> 1. A cylinder circuit 2 that communicates with R2, a bidirectional discharge pump 10 that is a hydraulic pressure source that selectively supplies hydraulic pressure to the two pressure chambers R1 and R2 via the cylinder circuit 2, and the bidirectional discharge pump 10 And an accumulator A connected to the left end of the bidirectional discharge pump 10 in FIG. 1 and electromagnetic on-off valves 5 and 6 as a pair of on-off valves provided in the middle of the cylinder circuit 2. It consists of and.

  Hereinafter, the cylinder 1 will be described in detail. The cylinder 1 includes a cylindrical cylinder body C, a piston P slidably inserted into the cylinder body C, and a rod R penetrating the axial center portion of the piston P. The cylinder main body C is filled with a liquid such as hydraulic oil, and the cylinder main body C has a pressure chamber R1 and a cylinder main body C outside. And a port b for communicating the pressure chamber R2 and the outside of the cylinder body C.

  Further, the port a is connected to one end of the pipe 3 of the cylinder circuit 2, the port b is connected to one end of the pipe 4 of the cylinder circuit 2, and the other end of the pipe 3 is connected to the discharge pump 10. The other end of the pipe line 4 is connected to the other discharge port c of the two-way discharge pump 10 to a discharge hole (not shown). Therefore, the pressure chamber R1 and the pressure chamber R2 are communicated with each other via the cylinder circuit 2 constituted by the pipes 3 and 4. When the cylinder device S has a damper function, the piston P is provided with a passage communicating with the pressure chambers R1 and R2, and a damping force generating element such as an orifice or a leaf valve is provided in the passage. Should be provided.

  The left end of the rod R in FIG. 1 is coupled to a bracket B1 so that the cylinder device S can be attached to an apparatus or the like, and the bracket B2 is also screwed to the right end of the cylinder body C in FIG. Yes. Therefore, in the present cylinder device S, the mounting portions of the cylinder device S are the brackets B1 and B2.

  The bidirectional discharge pump 10 serving as a hydraulic pressure source includes a hollow pump body 11, a drive gear 12 and a driven gear 13 that are rotatably accommodated in a pump chamber 10 a in the pump body 11, two discharge holes c, (Not shown). The drive gear 12 is rotatably supported on the pump main body 11 side by a shaft 14. A motor M is connected to one end of the shaft 14, and the drive gear 12 is driven by driving the motor M. .

  Further, the drive gear 12 meshes with a driven gear 13 rotatably supported on the pump body 11 side by a shaft 15 so that when the drive gear 12 is driven to rotate, the driven gear 13 also rotates. It has become.

  Accordingly, the liquid discharge direction can be switched by rotating the motor M forward and backward, and the discharge hole c (not shown) also serves as a suction hole.

  A pump other than the gear pump described above can be used as the bidirectional discharge pump.

  Subsequently, the accumulator A includes a hollow accumulator main body 21, a free piston F slidably inserted into the accumulator main body 21, a liquid chamber L separated by a free piston F in the accumulator main body 21, and the free accumulator A. The biasing spring SP biases the piston F toward the liquid chamber L. The accumulator A is connected to the left end of the pump body 11 of the bidirectional discharge pump 10 in FIG. 1 to integrate the bidirectional discharge pump, and the liquid chamber L is connected to the shaft 14 and the shaft 15 of the pump body 11. Is connected to the pump chamber 10a via a pipe line 20 communicating with a hole (not shown) inserted therein.

  The bidirectional discharge pump 10, the motor M, and the accumulator A described above are integrated to form one block. The bidirectional discharge pump 10, the motor M, and the accumulator A that are made into a block are connected to the cylinder 1. The cylinder body C is connected to the outer periphery. Since the shaft 14 as the drive shaft of the bidirectional discharge pump 10 as the hydraulic pressure source and the axis of the cylinder 1 are arranged in parallel, the motor M does not interfere with the cylinder 1 and will be described later. The distance between the center line CL of the cylinder 1 and the bidirectional discharge pump 10 can be reduced.

  Next, the electromagnetic on-off valves 5 and 6 provided in the middle of the pipelines 3 and 4 as the cylinder circuit 2 will be described. The electromagnetic on-off valves 5 and 6 have basically the same configuration, although there is a difference whether the installation location is in the middle of the pipeline 3 or in the pipeline 4. In order to avoid this, only one of the electromagnetic on-off valves 5 will be described, and the same reference numerals will be given to the same members in each part.

  The electromagnetic on-off valves 5 and 6 are both installed in the valve case V, and the pipe lines 3 and 4 are provided in the valve case V.

  The electromagnetic on-off valve 5 is attached to a valve seat 30 provided in the middle of the pipe line 3, a valve body 31 provided on the valve seat 30 so as to be freely attached and detached, and the valve body 31 facing the valve seat 30. A biasing spring 32 that biases and a solenoid 33 that applies thrust to the valve body 31 in a direction against the biasing force of the biasing spring 32 when applied are provided. When the solenoid 33 is applied, the valve body 31 is separated from the valve seat 30 to open the conduit 3. Therefore, if the pipes 3 and 4 are opened by the electromagnetic on-off valves 5 and 6 and the bidirectional discharge pump 10 is driven, the cylinder 1 can be expanded or contracted, and the pipes 3 and 4 are electromagnetically opened and closed. If the valves 5 and 6 are shut off, the liquid in the pressure chambers R1 and R2 in the cylinder 1 is prevented from moving, so that the cylinder 1 can be locked into a rod-like body that cannot be expanded and contracted.

  As described above, the electromagnetic on-off valves 5 and 6 are accommodated in the valve case V so as to face each other so as to be coaxial with each other and are blocked. The cylinder 1 is connected to the outer periphery of the cylinder body C. As described above, the electromagnetic open / close valves 5 and 6 are accommodated in the valve case V so as to be coaxial with each other, so that the electromagnetic open / close valves 5 and 6 and the center line CL of the cylinder 1 are connected to each other. The distance can be reduced.

  Accordingly, the valve case V in which the electromagnetic open / close valves 5 and 6 are blocked, the bidirectional bidirectional discharge pump 10, the motor M, and the accumulator A are all arranged on the outer periphery of the cylinder body C with the cylinder 1 as the center. It will be connected.

  Then, the distance between the center line CL of the cylinder 1 which is a line connecting the attachment parts of the cylinder device S in FIG. 1 and the center line PL of the bidirectional discharge pump 10 which is a hydraulic pressure source is compared with the conventional cylinder device. Shortening, that is, the cylinder device can be made compact.

  Therefore, in this cylinder device S, the amount of swing (the swing angle × the distance between the center line CL and the center line PL) of the cylinder device S when the device vibrates, etc., can be reduced. The risk of doing so is reduced.

  Further, as described above, since it is more compact than the conventional cylinder device, the mountability to equipment with a limited mounting space is also improved.

  Furthermore, since the center of gravity of the cylinder device S can be set near the center line of the cylinder 1, the moment of inertia of the cylinder device can be reduced, so that the deflection of the cylinder device can be made faster than the conventional cylinder device. In addition to being able to stop, it is possible to reduce the adverse effects of inertial force due to the vibration of the cylinder device acting on the device side.

  Further, as described above, since the respective parts are arranged around the cylinder 1, the pipes 3 and 4 of the cylinder circuit 2 are necessarily arranged on the outermost peripheral side of the cylinder device S, and the pipe length thereof Also gets longer. Therefore, the liquid passing through the pipes 3 and 4 can be cooled by the pipes 3 and 4. That is, it is possible to prevent the temperature of the liquid in the cylinder 1 from rising and the liquid to leak from the cylinder device S, or to prevent a change in the damping characteristic when the cylinder device S functions as a damper. is there.

  In order to enhance the liquid cooling effect in the pipelines 3 and 4, cooling fins may be formed outside the pipelines 3 and 4.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is sectional drawing of the cylinder apparatus in one Embodiment. It is sectional drawing of the conventional cylinder apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Cylinder circuit 3, 4, 20 Pipe line 5, 6 Electromagnetic on-off valve 10 which is an on-off valve Bidirectional discharge pump 10a Pump chamber 11 Pump main body 12 Drive gear 13 Driven gear 14 Shaft 15 Shaft 21 Accumulator main body 30 Valve seat 31 Valve Body 32, SP Energizing spring 33 Solenoid A Accumulator B1, B2 Bracket C Cylinder body CL Cylinder center line F Free piston M Motor P Piston PL Fluid pressure source center line R Rod R1, R2 Pressure chamber S Cylinder device V Valve case a, b Port c Discharge hole

Claims (4)

A cylinder, a supply pressure source selectively hydraulically two pressure chambers formed in the cylinder through the cylinder circuit communicating with two pressure chambers above, each provided in the middle of the cylinder circuit A pair of electromagnetic on-off valves that respectively lock the pressure chambers , each of the electromagnetic on-off valves being attached to and detached from the valve seat, a biasing spring that biases the valve body toward the valve seat, and In a cylinder device provided with a solenoid that applies thrust to the valve body in a direction against the urging force of the urging spring , the electromagnetic on-off valve is housed in the valve case, and the valve case and the hydraulic pressure source are A cylinder device that is directly attached to the outer periphery of the cylinder. 2. The cylinder device according to claim 1, wherein the on-off valves are arranged on the outer periphery of the cylinder so as to face each other so as to be coaxial or substantially coaxial. 3. The cylinder device according to claim 1, wherein the drive shaft of the hydraulic pressure source is parallel or substantially parallel to the axis of the cylinder. The cylinder device according to any one of claims 1 to 3, wherein a cooling fin is provided outside the cylinder circuit.

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