JPH028086Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a multistage fluid pressure cylinder in which a plurality of movable cylinders each having a piston on the base end side are sequentially fitted into a basic cylinder. More specifically, the present invention relates to the structure of the cylinder mounting side end of the basic cylinder in this multi-stage hydraulic cylinder, particularly the rod side end.

(Prior art and its problems) The structure of the cylinder mounting end of the basic cylinder in a conventional multi-stage fluid pressure cylinder will be explained with reference to Figs. 3 and 4. First, Fig. 3 shows the mounting type.
This shows the cylinder mounting side end (rod side end) of the basic cylinder, which is the FA type or TA type.The tube flange is welded to the tube end of the basic cylinder, while the first stage movable A bushing that is externally fitted onto the tube of the cylinder is formed integrally with a flange-shaped support member for mounting the cylinder, and an annular fitting stage is formed by one end surface of the support member and the outer peripheral surface of the bushing. The tube flange is fitted into the tube flange, and the support member 2 and the tube flange are integrally connected by a bolt screwed into the tube flange from the support member 2 in the axial direction, and the basic cylinder A plurality of short cylindrical members for supply/discharge ports and air vent holes are welded to the end of the tube in the circumferential direction. Although not shown in the drawings, the cylinder mounting support member D has a plurality of bolt holes extending in the axial direction in the periphery when used in the FA type, and in the case of the TA type. has a pair of pivot shafts protruding from both sides of its outer peripheral surface. Incidentally, steel is generally used for cylinder mounting members such as the above-mentioned support member 2 due to convenience or necessity in design and manufacturing, and steel is often used for sliding members such as the bushings mentioned above, such as gunmetal. It is preferable to use a material with good sliding properties and wear resistance, but in the conventional structure described above, the bushing is formed integrally with the cylinder mounting support member, so it is preferable to use a material with good sliding properties and wear resistance. When using a bushing, it is necessary to perform secondary processing such as surface treatment on the bushing, which is extremely troublesome to manufacture, and if the bushing becomes worn or damaged, the entire bushing must be replaced. There was an inconvenience.
Furthermore, due to its structure, this support member 2 was designed exclusively for the FA type or TA type, so it could not be used as a cylinder mounting member for the FB type or TB type, and there was no compatibility at all. Furthermore, in order to install supply/exhaust ports and air vents, welding must be performed for each cylindrical member, which is quite time-consuming.
In addition, due to this type of welding, the space between the supply/discharge port, air vent hole, and tube flange becomes a so-called dead space (shown with a circle in Figure 4), so the cylinder length must be made at least that much longer. This is one of the drawbacks of multi-stage cylinders.

On the other hand, Figure 4 also shows the mounting side end of another cylinder used as FA type or TA type. According to this figure, a cylinder with the same inner diameter as this tube buoy is attached to the end of the tube buoy of the basic cylinder. A bushing member H' to which a supporting metal fitting N' is welded and a connecting flange O protruding from one end of the outer circumferential surface is fitted onto the tube of the first stage movable cylinder. The support fitting N' is fitted into the annular fitting step H' formed on the other end of the outer peripheral surface of the member C', and is screwed into the support fitting N' from the connecting flange O. The bushing member N' and the support fitting N' are integrally connected by a bolt, and the mounting structure for the supply/discharge port and the air vent hole is the same as that shown in FIG. 3. This fourth
In the conventional structure shown in the figure, the cylinder mounting support bracket is
and bushing member H′ are provided separately,
There is no problem as described above when both are integrally formed. However, the support metal fittings
Since the tube is welded and fixed to the tube of the basic cylinder, this tube is dedicated to the FA type or TA type, and once the support fitting N' is fixed during the manufacturing process, it can be used as the FB type or TB type tube.
There is no possibility of converting it to a new shape, which limits its uses, and if the supporting metal fittings are damaged due to poor connection using bolts, etc. when installing the cylinder, the tube tube will also have to be replaced. There is. Furthermore, there are problems similar to those of the conventional example shown in FIG. 3 regarding the mounting structure of the exhaust port and the extraction hole.

(Technical means for solving the problem) The present invention was made with the aim of solving the above-mentioned problems. A bushing member is provided, which has annular fitting step parts formed on both sides of the flange part, and is slidably fitted externally to the tube of the first movable cylinder, and the bushing member has one of the above-mentioned steps. A tube flange, which is integrally connected to the rod side end of the tube of the basic cylinder and has a supply/discharge port, is fitted into the fitting step, and a tube flange for mounting the cylinder is fitted into the other fitting step. It is characterized in that the support metal fittings are engaged, and the support metal fittings, the clamping flange portion, and the tube flange are connected by bolts.

(Example) Next, embodiments of the present invention will be described.

Figure 1 shows the overall structure of a multi-stage fluid pressure cylinder whose mounting type is FA type. Within a basic cylinder 1, movable cylinders 2 and 3 each having pistons 4 and 5 on the base end side are sequentially installed. A flow passage 6 is provided in the piston 4 of the first movable cylinder 2 in its axial direction to allow the reciprocating side fluid chambers 7 and 8 of the movable cylinders 2 and 3 to communicate with each other. A delivery pipe 9 extending in the axial direction is provided in the center of the piston 4, a flow passage 10 is provided in the piston 4 and a flow passage 10 is provided in the piston 4, and a passageway 10 is provided in the tube 11 of the second movable cylinder 3 near the connection part with the piston 5. A plurality of flow holes 12a, 12b, 12c are provided to communicate the inside and outside of the tube 11, so that the reciprocating side fluid chambers 13, 14 of the movable cylinders 2, 3 communicate with each other. Here, the piston 4 of the first movable cylinder 2 has a flow passage 1 provided in its radial direction.
An annular groove 1 corresponding to the opening to the outer periphery of 0
5 is provided, and this concave groove 15 and the reciprocating side fluid chamber 1
The piston 4 is provided with one or more throttle holes 16 communicating with the piston 3.

At both ends of the tube 17 of the basic cylinder 1, tube flanges 18 and 19 having the same inner diameter as the tube 17 are integrally connected by welding. Port 20 and rod side supply/discharge port 21
are drilled in each. And this tube 1
A clamping flange 22 is protruding from the outer peripheral surface of the rod side end of the rod 7, and engaging steps 23 and 24 are formed on both sides of the flange 22, respectively. Tube 2 of cylinder 2
A bushing member 25 is slidably fitted to the bushing member 25, and the end of the rod-side tube flange 19 is fitted into one fitting step 23 of the bushing member 25. A cylinder mounting support fitting 27 for the FA type is fitted into the fitting stepped portion 24, and these support fittings 27 and the bushing member 25
and a plurality of bolts 28 with tube flanges 19 screwed into the bushing member 25 side from the support metal fitting 27 side.
are connected together by... As is clear from FIG. 2, this cylinder mounting support fitting 27 is provided with a plurality of bolt holes 27a at regular intervals in the circumferential direction, through which the bolts 28 are inserted, on its inner periphery, and on its outer periphery. A plurality of bolt holes 27b for cylinder attachment are provided on both sides. Also,
The clamping flange portion 22 of the bushing member 25 and the tube flange 19 are provided with bolt holes 2 of the support fitting 27.
Bolt holes 29 and screw holes 30 are provided at positions corresponding to 7a, respectively.

On the other hand, a head cover 31 is attached to the head side end of the tube 17 of the basic cylinder 1. It has fitting steps 33 and 34, and the end of the tube flange 18 on the rod side is fitted into one of the fitting steps 33, so that the head cover 3
1 is integrally connected to the tube flange 18 by a plurality of bolts 35 screwed into the tube flange 18 from the clamping flange 32 side. This clamping flange 18 has the same outer diameter as the clamping flange portion 22 of the bushing member 25, and has bolt holes 36 of the same diameter provided in the same arrangement as the bolt holes 29 of the flange portion 22.
Furthermore, the fitting stepped portion 34 is formed so as to be able to fit the cylinder mounting support fitting 27 used in the FA type, and therefore, as shown by the imaginary line in FIG. By fitting a support fitting 27', which is the same as the FA type support fitting 27, into the fitting step 34, and screwing the bolt 28' into the screw hole 37 of the head side tube flange 18 from the bolt hole 36, and tightening. , can be of FB type. In other words,
This means that the same support bracket can be used for both FA and FB types. In this case, remove the support fitting 27 for the FA type from the bushing member 25,
Another bolt of an appropriate length may be screwed into the threaded hole 30 of the rod-side tube flange 19 from the bolt hole 29 of the clamping flange portion 22 thereof.

A cushion boss 38 is formed in the center of the piston 4 of the first movable cylinder 2 on the side facing the reciprocating side fluid chamber 7, and a cushion is formed in the head cover 31 to fit with the cushion boss 38 with a slight distance therebetween. A hole 39 is provided. The cushion boss 26 has a recess 38a at the center of the end surface of a cylindrical object, and has a small diameter at the connecting portion with the piston 4.
The depth of the recess 38a is longer than the depth of the recess 38a.
The through hole 38b and the through hole 3 that penetrate from the
8b and the forward-side fluid chamber 7 has a small-diameter throttle hole 38c penetrating therethrough. Therefore, when the piston 4 moves back and the cushion boss 38 fits into the cushion hole 39, the fluid in the cushion hole 39 has its discharge passage constricted by the throttle hole 38c, and a cushion effect is obtained, and the tip of the cushion boss 38 It comes into contact with the bottom of the cushion hole 39 and acts as a stopper.

In the above embodiment, the FA type cylinder mounting bracket was explained, but according to the present invention, the TA type cylinder mounting bracket can also be applied, and in that case, the support bracket can also be used in common with the TB type support bracket. becomes possible.

(Effects of the invention) According to the invention, since the cylinder mounting support fittings are separate and independent from the bushing member and the basic cylinder tube, the cylinder mounting format can be changed, for example, by simply replacing the support fittings. F.A.
When manufacturing multistage hydraulic cylinders that can be easily changed from type to FB type or from type TA to type TB, and therefore have a wide variety of mounting types, most of the Since they can be shared, manufacturing costs can be reduced. On the other hand, since it is possible to use the optimal materials for each of the support fittings and bushing members, their performance can be improved and their processing can also be improved. It becomes easier. In addition, since the support fitting, bushing member, and tube flange connected to the tube can be disassembled from each other, for example, if only the bushing member or the support fitting becomes worn or damaged, only that part needs to be replaced, reducing maintenance. It is very advantageous in terms of Furthermore, since the supply and discharge ports are drilled in the tube flange of the basic cylinder tube, the drilling work is much easier than the conventional welding work to attach ports made of short cylindrical members. Furthermore, since the exhaust port can be located at the tip of the tube, dead space in conventional structures can be minimized, and the cylinder length can therefore be made shorter.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional view of a multi-stage fluid pressure cylinder showing an embodiment of the present invention, Fig. 2 is an end view of the cylinder mounting support as seen from the arrow in Fig. 1, and Figs. 3 and 4. 2A and 2B are cross-sectional views of main parts of multi-stage fluid pressure cylinders showing conventional examples, respectively. 1... Basic cylinder, 2... First movable cylinder, 3... Second movable cylinder, 4, 5... Piston, 17... Tube of basic cylinder, 19...
Tube flange on the rod side, 21... Supply/discharge port on the rod side, 22... Clamping flange part, 2
3, 24... step part for engagement, 25... bushing member,
26...Tube of the first movable cylinder, 27...
Cylinder mounting support bracket, 28...bolts.

Claims (1)

[Scope of utility model registration request] A multistage cylinder in which a plurality of movable cylinders each having a piston on the base end side are sequentially fitted into a basic cylinder, has a clamping flange on the outer circumferential surface, and has a clamping flange on both sides of the flange on both sides of the flange. A bushing member is provided, each of which has an annular fitting step, and is slidably fitted into the tube of the first movable cylinder, and the one fitting step of the bushing member is provided with a basic cylinder. At the same time, a tube flange that is integrally connected to the rod side end of the tube and has a supply/discharge port drilled therein is engaged, and a cylinder mounting support is engaged with the other engagement step, and these A multi-stage fluid pressure cylinder characterized in that a support fitting, a clamping flange portion, and a tube flange are connected by bolts.