JPS60256603A - Cylinder device - Google Patents

Abstract

PURPOSE:To simplify a mechanism further form it in a compact size, by inserting a control rod, which forms on its peripheral surface a spiral groove to be cut, into a piston and rotating this control rod so as to open and close a line in a circulative system. CONSTITUTION:A control rod 4, forming on its peripheral surface a spiral groove 13, is inserted into a piston 2 and rotated causing a fluid pressure line in a circulative system to be opened and closed, and the piston 2 is actuated so as to longitudinally move making a follow-up motion with rotation of the control rod 4. In this way, a mechanism is simplified and formed in a compact size further prevented from a trouble and/or misoperation because the control rod 4 itself serves as a control device.

Description

Detailed Description of the Invention The present invention relates to a cylinder device that uses fluid pressure, and in particular, by rotating an operating rod with a spiral groove cut on its outer circumferential surface, a piston is moved forward in proportion to the amount of rotation. It is characterized by allowing

Generally, a copying cylinder device consists of a hydraulic cylinder and a control mechanism including a servo valve, both of which are formed separately, and the hydraulic cylinder is operated by so-called remote control. Therefore, the mechanism is complicated,
Moreover, hydraulic cylinders did not always operate smoothly.

In order to solve this problem, the present inventor invented a copying cylinder device that moves the piston forward by -(tma) by moving the operating rod forward, and has already filed an application (Japanese Unexamined Patent Application Publication No. 59/1989). -26606).This cylinder uses a hydraulic cylinder or an air cylinder as a differential type cylinder, incorporates an operating rod into it, and moves the piston rod forward and backward in synchronization with this operating rod. Compared to the conventional device mentioned above, the mechanism is extremely simple and the piston rod can be actuated by the desired amount, which is an advantage, or there is a need for space at the ridge of the cylinder for the operation rod to move in and out. In addition, when the operating rod is controlled by the motor, the rotational speed of the motor is reduced by n degrees when the rotational speed of the motor is changed to the linear motion of the operating rod, which is not satisfactory.

The present invention solves these problems and further improves the accuracy of piston control. A 2-sen groove is cut on the outer circumferential surface of the % operation rod, and this is used as a fluid flow path to control the operation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention, in which the forward and backward movement of a piston is controlled by rotating a rod, will be specifically explained based on the illustrated embodiment.

In the figure, numeral 1 is a cylinder, 2 is a piston, 3t piston rod, and 4 is an operating rod.

The relationship between the cylinder, piston 2, and piston rod 3 is similar to that of a normal hydraulic cylinder or air cylinder, and the piston 2 is connected to the cylinder l.
The outer peripheral surface of 7 is in contact with the circumferential surface of the cylinder to connect cylinder 1 to the front cylinder chamber 5.
The piston rod 3 is formed integrally with the front surface of the piston 2, and its tip protrudes from the front cylinder cover 7 and is integral with the piston 2. They are beginning to move forward and backward. Similarly, the piston 2 only moves linearly and does not rotate.Therefore, although not shown, a mechanism for preventing rotation is provided to the piston 2.

In addition, an insertion hole 8 is bored in the piston 2 and the piston rod 3 from the back side of the screw A/2, and the ridge cylinder cover 9
A discharge chamber 16 is attached thereto, and the aforementioned operating rod 4 passes through the discharge chamber 16 and the ridge cylinder cover 9 and is fitted into the insertion hole 8. This operating rod 4 only rotates and does not move forward or backward, and -
As an example, as shown in the figure, 7.7
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It is designed to be held in place. The cylinder is provided with an inlet lO for pressurizing a working fluid such as hydraulic oil or compressed air into the front cylinder chamber 5, and an outlet 15 for discharging fluid from the discharge chamber 16 to the outside of the system. In addition, a flow passage 11 is formed at the base end of the piston rod 3, which communicates between the front cylinder chamber 5 and the insertion hole 8, and further between the front and middle portions of the piston rod 3. A flow path 12 is formed between them, and both ends thereof are open toward the plume hole 8.

The operating rod 4 has a function as a spool valve for the above-mentioned flow passage 11, and also functions as a fluid flow passage for the rear cylinder chamber 6, and also serves as a discharge line for discharging the fluid in the rear cylinder chamber 6 to the outside of the system. A spiral groove 13 is cut on the outer circumferential surface between the tip and a portion close to the rear cylinder cover 9, and the tip of the rod 4 and the flange 17 are formed inside the groove.
Next, the operation of the cylinder device configured as described above will be explained.

The operating rod 4 is connected to a control motor (not shown) to rotate forward and reverse, and when it rotates forward, the spiral groove 1
31 is assumed to move to the left in the figure relative to the open ends ll' and 1) of the flow passages 11 and 12.

FIG. 3 (A) shows a state in which the open ends l? and d of the flow passages 11 and 12 do not engage with the spiral groove 13 even if they fall down, are closed by the operating rod, and the piston 2 is fixed. In this state, Rotate the operating rod 4 in the normal direction. Then, the spiral groove 1
3 moves to the left, and one point 13' is the opening end 1.
7, and the flow path 11 and the spiral groove 13 are electrically connected (see FIG. 3(b)). Therefore, the working fluid forced into the front cylinder chamber 5 through the injection port IO passes through the flow path 11 and enters the spiral groove 13, and is further sent into the rear cylinder chamber 6 through the spiral groove 13. The working fluid in the front cylinder chamber 5 acts as a force F□ to force fL against the front surface of the piston 2, and the working fluid in the rear cylinder chamber 6 A force F2 acts on the rear surface of the piston 2 to force it forward.

Here, the fluid pressure on the 5th day of the front cylinder chamber is Pl and T
TL force F1 is F, = P, (cross-sectional area of piston 2 - cross-sectional area of piston rod), and if the fluid pressure in the ridge cylinder chamber 6 is F2, the force F2 is F2 = P, (cross-sectional area of piston - cross-sectional area of operating rod)
becomes.

Here, when the system is in a steady state, the pressure P□ and the pressure force are almost the same, so if this pressure is P, then the force of F2-Fl on the piston 2, that is, P (of the piston rod) The force (cross-sectional area - cross-sectional area of the sweeping rod) acts,
The piston will move forward due to this force. When the operating rod 4 rotates in the normal direction, the spiral groove 13 moves relatively, and along with this movement, the piston "1"
The engine 2 will move forward. When the rotation of the operating rod 2 is stopped, the piston 2 stops when the open end 11 is disengaged from the groove li (see FIG. 3(A)). Further, when the operating rod 4 is reversed from the state shown in FIG. 3 0), the threaded groove 13 moves to the right and engages with the opening end 12 of the flow path. Then, the ridge cylinder chamber 6 forms a spiral groove 13. Distribution channel and discharge channel 1
4′f: Conducts to the transverse outlet port 15. Then, the fluid pressure P2 in the rear cylinder chamber 6 decreases significantly, and the force acting on the piston 2 becomes almost only F□, so the piston 2 retreats due to this force F□, and the opening is closed. The end 12' is retracted until it is brought into or out of engagement with the groove 13'.

By the way, in the above, although there are no particular restrictions on the shapes of the opening ends 11' and 12', they are designed to increase the accuracy of the piston 2 following the rotation of the operating rod 4 and to balance the influence of fluid pressure on the rod 4. In this case, it is preferable to make the helical groove 13 and the C1-shaped spiral 0"5"1°1°1--1"°ゞ°"1,11 rotations. The positional relationship of the opening ends 11 and 12' of the flow passages 11 and 12 with respect to the %13I and the rod influences the 8 degrees of follow-up of the piston 2 with respect to the amount of rotation of the operating rod 4.

FIG. 4 shows that the distance a between the rear end 119r of the opening end 17 of the flow passage 11 and the front end 12'f of the opening end 12 of the flow passage 12 is greater than the distance between the front end ta 1 of the spiral groove 13' and the spiral groove dr. This shows the case where it is formed narrowly. In this case, the open end 11'
Both the open end 12' and the opening end 12' are closed, and the piston 2 is fixed ρ, and even if the operating rod 4 is rotated in the forward or reverse direction, the spiral groove l! Since the piston 2 remains fixed and does not operate until one of the opening ends 11' and 13' engages with either the opening end 11' or ld, the difference in the lengths of the ends (b, a)
An amount of play is generated on the operating rod 4 by an amount corresponding to .

FIG. 5 shows the case where the distance a is made wider than the distance b. In this case, both the open end 11' and the open end 12 engage with the spiral groove, and the inlet LO communicates with the outlet 15, so the piston 2 is in an unloaded state, and the open ends 11' and 12 '
Since either one of the pistons moves forward until it is released from the helical groove, the piston 2 is left with an amount of play corresponding to the above-mentioned length difference (a-b).

As described in detail above, the present invention has a spiral groove formed on the outer circumferential surface so that the piston moves forward and backward in accordance with the rotation of the operating rod. Therefore, since the operating rod itself is a control device, the mechanism is extremely simple and there is no risk of failure or malfunction.However, since the operating port 1 is rotary, the device can be made compact. This results in a high degree of accuracy.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a partially cutaway perspective view of the same, Fig. 3 is a longitudinal sectional view showing the same operating state, and Figs. FIG. 2 is a vertical cross-sectional view showing one embodiment. l; Cylinder 2: Piston 3; Piston rod 4; Operating rod 5; Front cylinder chamber 6; Rear cylinder chamber 7; Front cylinder cover 8; Insertion hole 9: Rear cylinder cover
lO; Inlet U; Flow passage 12sfi Passage l; Spiral groove Old discharge channel Old discharge port 16; Discharge chamber 17; Flange Fig. 3 (A) 1 port) Fig. 4 Fig. 5 H-1 -b -i Procedural amendment (1 reference 1, Indication of case 1982 Patent application No. 113590 2, Name of invention Cylinder device Address 90 Miyuki-cho, Hamamatsu-shi Name Yukio Watanabe 4, Attorney examination 1 Figure and Figure 2 has been corrected in the attached document.

Claims (1)

[Claims] Screws on the cylinder):/'f: A piston rod is integrally protruded from the inside of the cylinder, and an insertion hole is bored in the piston rod from the rear surface of the piston, and the rear cylinder cover is passed through the cylinder. The operating rod is inserted and fitted into the insertion hole to form a working fluid inlet in the front cylinder chamber, and the base end of the piston rod connects the front cylinder chamber and the insertion hole. A flow passage 11 is formed, and a flow passage L2i is formed between the front part and the intermediate position, and both ends thereof are opened toward the insertion hole, and the above-mentioned flow passage is provided on the outer peripheral surface of the operating rod from near the tip to near the base end. A cylinder device having a 2% mark by cutting a spiral groove that engages with the open ends of passages 11 and 12.