JPS6396333A - Hydraulic device - Google Patents

Abstract

PURPOSE:To make a hydraulic device wholly compact by forming a flow passage between a casing to connect a cylinder chamber for slidably guiding a piston with another cylinder chamber and a cylinder in a grooved shape. CONSTITUTION:A cylinder 10 is provided with a communicating hole 10d communicating with one cylinder chamber S1 bounded by a piston 11 in a cylinder 10 for slidably guiding the piston 11 and a communicating hole 10e communicating with another cylinder chamber S2. A communicating groove 26a connecting both the communicating holes 10d, 10e is formed between a casing 1 for accommodating the cylinder 10 and said cylinder 10. Thus the composition of a hydraulic device can be simplified, and said device itself can be also made wholly compact.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a hydraulic device comprising a cylinder and a piston.

(Prior art) In a shock absorber that uses fluid passage resistance, a passage that moves hydraulic fluid from one cylinder chamber to the other cylinder chamber with the piston as a boundary as the piston slides in the cylinder accommodates the cylinder. This passage is provided between the casing and the cylinder, and conventionally a pipe system has been adopted as this passage.

(Problems to be Solved by the Invention) However, the configuration in which a conduit is provided between the casing and the cylinder not only complicates the connection configuration between both cylinder chambers with the piston as a boundary, but also This results in an enlarged diameter, making it difficult to make the hydraulic cylinder more compact and reduce costs.

Structure of the Invention (Means for Solving Problems) Therefore, the present invention provides a communication hole that communicates with one cylinder chamber bordering the piston in a cylinder that slides and guides the piston, and a communication hole that communicates with the other cylinder chamber. A communication hole was provided through the cylinder, and a flow groove connecting the communication holes was formed between the cylinder and a case housing the cylinder.

(Operation) That is, as the piston slides within the cylinder, the hydraulic oil in the cylinder chamber on the piston movement side flows into the circulation groove and flows into the other cylinder chamber via the circulation groove. At this time, passage resistance corresponding to the minimum fluid passage cross-sectional area of the fluid path between both cylinder chambers acts on the hydraulic oil, and movement of the piston is buffered by the fluid passage resistance.

By employing a groove shape as a flow path that connects both cylinder chambers, the connection structure between both cylinder chambers becomes simple. Moreover, the distance between the casing and the cylinder can be narrowed, and the diameter of the casing can be reduced.

(Example) Hereinafter, an example embodying the present invention will be described based on FIG. 1.2.

Lids 2 and 3 are fitted and fixed to both ends of the cylindrical casing 1. A piston rod 4 is slidably supported through one lid 2, and a fluid passage is provided in the other lid 3. An adjustment rod 5 for adjusting resistance is inserted. At the outer ends of the piston rod 4 and the adjusting rod 5 there is a connecting ring 6.7.
is screwed and fixed, and a pressing spring 9 is interposed between the flange 6a of the connecting ring 6 and the retaining ring 8 on the outer periphery of the casing 1.

A cylinder 10 is installed and fixed between the molds 2 and 3 in the casing 1, and a piston 11 is tightened and fixed to the inner end of the piston rod 4 so as to be able to slide inside the cylinder 10. The interior of the cylinder 10 is divided by the piston 11 into two cylinder chambers 31°82. piston 1
A communication hole 11a is formed in the piston 11, and an auxiliary valve 30 is connected to a pressure spring 31 on the end surface of the piston 11 on the cylinder chamber Sl side.
The communication hole 11a is arranged so as to be closeable.

The pressure spring 12 is connected to the piston rod 4 on the cylinder chamber Sl side.
The piston 11 is wound around the lid 2 so that the collision of the piston 11 with the lid 2 is alleviated.

The inner end of the adjustment rod 5 is formed in a large diameter portion 13, and the adjustment rod 5 is fixed.

An annular groove 13a is formed in the distal end surface of the large diameter portion 13, and a plurality of through holes 13b are provided in the axial direction of the adjustment loft 5 so as to open into the groove 13a.

A through hole 5a is formed in the central axis of the adjustment rod 5 from the inner end to the outer end, and an annular groove 5b is formed on the outer periphery of the small diameter portion of the adjustment rod 5, and the through hole 5a and the annular groove 5b is in communication. A bolt 14 is screwed into the through hole 13b, and a pressure spring 29 is interposed between the bolt 14 and the large diameter portion 13. A small hole 14a is transparently provided in the central axis of the bolt 14, and the cylinder chamber S2
and the through hole 13b are in communication with each other.

An adjustment ring 15 for adjusting fluid passage resistance is fitted into the small diameter portion of the adjustment rod 5 so as to be joined to the rear end surface of the large diameter portion 13.
5 is fixed by fitting into an annular recess 15a on the outer periphery. A through hole 1 is provided at the end surface of the adjustment ring 15 that joins the large diameter portion 13.
An annular groove 15b is formed to connect with the groove 3b, and a pair of semicircular arc adjustment grooves 15c and 15d are formed on the same central circle on the other end surface. The readjustment grooves 15c and 15d are both formed to become deeper as they go counterclockwise, and the deepest parts thereof have through holes 15e and 15f.
is transparently provided so as to communicate with the annular groove 15b.

An adjustment tube 16 for adjusting fluid passage resistance is connected to the rear end surface of the adjustment ring 15 at the small diameter portion of the adjustment rod 5, and is rotatably connected to the inner surface of the cylinder 10 and rotated to extend from the lid 3. possible to be mated. The inner end of the adjustment tube 16 is formed in a large diameter part 17, and an annular groove 17a is formed on the outer periphery of the large diameter part 17, and a pair of grooves 17a are formed in the outer circumference of the large diameter part 17. Passage 17b, 17
c is notched. A pressure spring 18 is interposed between the large diameter portion 17 and the lid 3, and the inner end surface of the adjustment cylinder 16 is pressed against the adjustment ring 15. A plurality of through holes 16a are transparently provided in the small diameter portion of the adjustment cylinder 16 at a portion where the pressure spring 18 is interposed, and the through holes 16a communicate with the annular shape a5b in the above-mentioned joined state. A communicating hole 10c is provided at a portion of the cylinder 10 that corresponds to the through hole 16a, a portion that corresponds to the annular groove 17a, and a portion that corresponds to the cylinder chamber S1.

10d and 10e are provided transparently.

A cup-shaped operating knob 19 is fixed to the outer end of the adjustment barrel 16, and the adjustment barrel 1 is rotated by rotating the knob 19.
6 rotates around the adjustment rod 5. The operating knob 19 is made up of a pair of divided pieces 19a, 19b that are fastened together using a wire 20, and positioning balls 21, 22 are provided between the inner end surfaces of both the divided pieces 19a, 19b and the outer end surface of the lid 3. is mediated. Both positioning balls 21 and 22 are press springs 23
The adjusting cylinder 16 is pressed against the outer end surface of the lid 3 by the angle 24, and can be switched and held in a plurality of positions by fitting into a plurality of positioning recesses 3a formed on the circumference of the outer end surface.

A support cylinder 25 is fitted into the communication hole 10c of the cylinder 10, and a cylindrical intermediate member 26 made of synthetic resin is fitted and secured to the cylinder 1o between the cylinder 25 and the lid 2. At the same time, it is hermetically fitted with a covering cylinder 27. A notch is formed in the cylindrical intermediate member 26 over the entire length, and both communication holes 10d of the cylinder 10,
10e is connected. Therefore, both cylinder chambers S1. S
2 are communication hole 10d, communication groove 26a, communication hole toe, annular groove 17a of adjustment tube 16, passages 17b, 17c, adjustment grooves 15c, 15d of adjustment ring 15, through holes 15e, 15f,
Communication is possible via the annular groove 15b and the through hole 5a of the adjustment loft 5. The support tube 25 has the communication hole 10 of the cylinder 10.
A through hole 25a is formed corresponding to c, and the gap between the casing 1 and the covering tube 27 is the through hole 25a and the adjustment tube 1.
6 through hole 16a, annular groove 5b of adjustment rod 5, through hole 5a
and communicates with the cylinder chamber S2 via the pore 14a of the bolt 14.

Now, by rotating the operating knob 19, the adjustment tube 16 is rotated to the position shown in FIG.
c faces the adjustment grooves 15c and 15d of the adjustment ring 15. In this state, when the piston 11 is moved leftward from the position shown in FIG.
d, flows out from the flow groove 26a, the annular groove 17a, and the passage 17.
b, 17C1 adjustment 1ji15c, 15d, through hole 15e,
15f.

It flows into the cylinder chamber S2 via a flow path (hereinafter referred to as L) consisting of the annular groove 15b and the through holes 13b and 13a. At this time, passage resistance corresponding to the cross-sectional area of the boundary between the adjustment grooves 15c, 15d and the passages 17b, 17c, which is the smallest fluid passage cross-sectional area in the flow path, is applied to the hydraulic oil, and the movement of the piston 11 is The speed is regulated according to the passing resistance. Conversely, when the piston 11 is moved to the right against the pressure spring 9, the hydraulic oil in the cylinder chamber S2 passes through the flow path while facing the same passage resistance as described above and flows toward the cylinder chamber S1. Inflow.

The passage 17 of the adjustment cylinder 16 is opened by rotating the operation knob 19.
b, 17c are the 8 circumferential adjustment grooves 15c, 15d of the adjustment ring 15.
If it is removed, the flow path is blocked and the piston 11 is regulated and held at its current position.

The flow path between the casing 1 and the cylinder 11, which occupies most of the flow path that provides such a buffering effect, is the cylinder 1.
1, the cylindrical intermediate member 26 having a notched groove, and the covering tube 27 have a groove shape, so both cylinder chambers 3
1. The connection configuration with S2 is extremely simple, which is very advantageous in terms of ease of manufacturing and cost reduction. Moreover, the depth of the flow groove 26a can be made shallower as appropriate in consideration of its width, and the distance between the casing l and the cylinder 11 can be narrowed. Therefore, the diameter of the casing 1 can be reduced, and the entire device can be made more compact. Furthermore, since the cylindrical intermediate member 26 is made of synthetic resin, it is easy to process and assemble.

Of course, the present invention is not limited to the above embodiments; for example, materials other than synthetic resin can be used for the cylindrical intermediate member, and various shapes can be selected depending on the material used or the processing method. be. As an example, the third
, as shown in Figure 4. In FIG. 3, the cylindrical intermediate member 32
A concave groove 32a serving as a circulation groove is formed on the inner circumferential surface of the groove 32a, extending over both ends. In FIG. 4, a concave groove 33a is formed on the inner circumferential surface of the cylindrical intermediate member 33 as a flow groove that does not reach both ends. Further, in the present invention, as shown in FIG. 5, a slightly thicker cylinder 28 is adopted, and communication holes 28a, 28b, and 28c similar to the communication holes 10c, 10d, and lOe of the cylinder 10 of the above embodiment are penetrated. In addition, a re-communication hole 28b is provided on the circumferential surface of the cylinder 28.

It is also possible to form a flow groove 28d that connects 28c, thereby reducing the number of structural members.

Effects of the Invention As detailed above, in the present invention, the flow path between the casing and the cylinder that connects both cylinder chambers is formed in the shape of a groove, which simplifies the configuration and makes the entire device more compact. It has an excellent effect of obtaining.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted vertical sectional view showing an embodiment embodying the present invention, Fig. 2 is a partially omitted exploded perspective view of essential parts, and Figs. 3 and 4 each show another example of the present invention. FIG. 5 is a partially cutaway perspective view of essential parts, and FIG. 5 is a partially omitted vertical sectional view showing another example of the present invention. Casing 1, cylinder 10, communication hole 10d. 10e, piston 11, cylindrical intermediate member 26, circulation groove 26
a, covering tube 27, cylinder chamber S1. S2, flow path.

Claims (1)

[Claims] 1. A cylinder (10) that slides and guides a piston (11).
A communication hole (10d) that communicates with one cylinder chamber (S1) and a communication hole (10e) that communicates with the other cylinder chamber (S2) bordering the piston (11) in the cylinder (10) are provided. A flow groove (26a) connecting both the communication holes (10d, 10e) between the casing (1) accommodating the cylinder (10) and the cylinder (10);
). 2. The circulation groove (26a) is connected to the cylinder (10), a cylindrical intermediate member (26) having a notch groove fitted to the cylinder (10), and a cylindrical intermediate member (26) fitted to the intermediate member (26). The hydraulic device according to claim 1, comprising a covering cylinder (27). 3. The flow groove (32a) is a concave groove formed across both ends of the inner peripheral surface of the cylindrical intermediate member (32) fitted to the cylinder (10). Hydraulic equipment. 4. The circulation groove (33a) is a concave groove formed on the inner peripheral surface of the cylindrical intermediate member (33) fitted to the cylinder (10) so as not to reach both ends. Hydraulic equipment as described in section.