JPS62237103A - Pressurized fluid cylinder - Google Patents

Abstract

PURPOSE:To exactly guide a driver rectilinearly by disposing a guide body provided with guide rails outside a barrel and connecting the barrel and the guide body in such a manner as to relatively displace perpendicularly to the axis of the barrel. CONSTITUTION:A guide body 1 provided with two guide rails parallel to each other along the axis of a barrel 2 is disposed outside the barrel 2 of a rodless cylinder, and the barrel 2 and the guide body 1 are connected in such a manner as to relatively displace perpendicularly to the axis of the barrel 2. In this arrangement, when fluid pressure in the barrel 2 works, the internal pressure works to open a slit 3 so that the barrel 2 displaces perpendicularly to the axis thereof. Since deformation of the barrel 2 is not transmitted to the guide body 1, the guide rails 6 are entirely not influenced by deformation of the barrel 2 so that a driver 9 can be guided rectilinearly very exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a so-called rodless cylinder type cylinder that does not have a piston rod.

In particular, the present invention relates to a pressurized fluid cylinder having a slit in its barrel, a driver connected to a piston inside the barrel protruding from the slit, and the driver being accurately moved in a straight line.

BACKGROUND OF THE INVENTION Such a rodless type pressure fluid cylinder has a guide track extending along the entire axial length of the barrel, as disclosed in, for example, U.S. Pat. No. 4,519,297.
The slits are formed on both outer edges of the barrel,
Guide strips attached to both sides of a fork-like driver connected to a piston in the barrel are guided by these guide tracks, respectively, and when an external force is applied to the driver from the side due to the sliding gap between the driver and the slit. ,
This is to prevent the driver from falling over and to smoothly move the driver in a straight line.

Problems to be Solved by the Invention According to the prior art, when a pressure fluid is applied to the piston, internal pressure is applied to the cylinder surface inside the barrel, and this internal pressure acts to open the slit portion outward. This deformation causes the barrel to deform.

The distance between the guide tracks on both sides of the slit increases, and the frictional force between the fork-shaped driver and the guide strip increases, making it impossible to achieve smooth linear movement of the driver.
In addition, due to the deformation of the barrel, the degree of deformation of the guide track is different between the axial ends and the center of the barrel, which prevents the driver from falling due to external forces from the side of the driver and achieves extremely accurate linear guidance. was difficult.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a guide body having a guide rail along the barrel axis on the outside of the barrel having a slit, relative to the barrel in a direction orthogonal to the barrel axis. It is characterized in that it is movably connected and that the guide element of the driver that protrudes from inside the barrel is guided by a guide rail to allow accurate linear movement.

Operation According to the above configuration, when the fluid pressure inside the barrel acts, the internal pressure acts to open the slit and the barrel is displaced in a direction perpendicular to the axis, but the barrel is connected to the guide body so that it can be displaced relative to the guide body. Therefore, the deformation of the barrel is not transmitted to the guide body, and the driver protruding from the slit in the barrel does not fall over even if an external force is applied from the side, and the guide rail of the guide body allows extremely accurate linear movement.

Embodiment As shown in FIGS. 1 to 4, a guide body 1 has approximately the same axial length as a barrel 2, and a slit 3 is formed in the side wall (upper wall) of the barrel 2 over the entire length, and the guide body 1 is U-shaped. Storage part 4
The size is set such that when the barrel 3 is supported by the end cap 5.5 as described later, an appropriate gap Q is created between the barrel 3 and the inner wall of the storage portion 4 in anticipation of deformation. Two guide rails 6.6 parallel to each other along the barrel axis are disposed along the entire length of the guide body 1 on both left and right sides of the upper opening of the guide body 1, and the guide rails 6 are V-shaped. A guide surface 7 is provided. Piston 8 inside barrel 2
is slidably fitted into the piston 8, and a driver 9 is fitted on this piston 8.
are connected and protrude from the slit 3 to both sides.

This driver 9 has a bin 1 in a direction perpendicular to the driver 9.
0 is fixed. Reference numeral 11 denotes a slider shown as a guide, which is formed in a gate shape so as to straddle the guide rail 6.6, and a guide member 12 having bearings etc. fitted at both ends thereof.
．． A bearing 12 is arranged, the bearing of which contacts the guide surface 7.7 of the guide rail 6.6 in a movable manner. The slider 11 is formed with a U-shaped groove 13 that opens downward in the center of the moving direction, and is configured to engage with the pin 10 of the driver 9 and move relative to the barrel axis in the left-right and up-down directions. has been done. On the other hand, end caps 5.5 screwed to both ends of the guide body 1 are shown as seals and elastic supports on the outer periphery of the insertion portion 14.14.
Ring 15.15 is attached and this insertion part 14.14
is inserted into the in-plane end of the barrel 2 and the O-ring 1
5.15, the barrel 2 is elastically supported with respect to the guide body 1, and is capable of relative displacement in the direction perpendicular to the barrel axis CL (while floating above all the inner walls of the storage section 4 of the guide body 1). ) installed. Both end caps 5゜5
In between, an inner band 16 that seals the slit 3 from the inside to prevent pressure fluid from leaking, and an outer band 17 that seals the slit 3 from the outside to prevent dust are disposed on the upper and lower sides of the slit 3. A port 18.19 for pressure fluid is formed in the cap 5.5.

Now, when pressure fluid is supplied from either of the pressure fluid ports 18.19, the piston 8 moves in the barrel axial direction, and the driver 9 engages the guide member 12.12 of the slider 11 and the guide rail 6.6. guided along the guide rail 6.6. In this case, internal pressure is applied to the barrel 2 due to the supply of pressure fluid, and the barrel 2
is deformed and the slit 3 opens in the direction perpendicular to the barrel axis CL.
An O-ring 15.1 is provided between the outer wall of the guide body 1 and the inner wall of the housing portion 4 of the guide body 1, and also between the insertion portion 14.14 of the end cap 5.5 fixed to the guide body 1.
Since the guide body 1 is connected through the guide body 5, deformation of the barrel 2 is not transmitted to the guide body 1 at all. Therefore, even if the barrel 2 is deformed due to internal pressure, the guide rail 6.6 of the guide body 1 has no effect on its steering, and the slider 11 has no effect on its steering.
6 provides extremely accurate linear guidance.

In this embodiment, the slider 11 and driver 9 are connected to pin 1.
0 through a U-shaped groove 13, and the slider 11 and driver 9 are moved relative to the barrel axis in the horizontal and vertical directions, so the center position of the piston changes vertically and horizontally due to the deformation of the barrel. However, the change does not cause any extra load on the slider 11. Furthermore, in this embodiment, the O-ring 15 floats the barrel 2 from the guide body 1 and also serves as a seal between the barrel 2 and the end cap 5, so the structure is simplified.

Other Embodiments In this embodiment, as shown in FIG. The insertion shaft 14 of the connection plate 20 fixed to the end surface of the guide body 1 separately from the cap 5 is inserted through the O-ring 21, and the barrel 2 is elastically supported with respect to the guide body 1.
This is to prevent the deformation of the barrel 2 from being transmitted to the guide body 1. According to this embodiment, the end cap 5 is affected by the deformation of the barrel 2, but since this deformation is absorbed by the O-ring 21, the guide body 1 is not affected at all.

Advantages of the Invention As described above, the present invention provides a rodless cylinder with a guide body provided with a guide rail along the barrel axis on the outside of the barrel, which is separate from the barrel, and the barrel and guide body are connected to the barrel axis. Because they are connected so that they can be relatively displaced in the orthogonal direction, when the piston inside the barrel is actuated by the action of pressure fluid, the slit part of the barrel or the member integrated with the barrel will not be deformed by the internal pressure caused by the pressure fluid applied to the barrel. However, this deformation can be prevented from being transmitted to the guide body, and the guide rail is completely unaffected by barrel deformation, allowing the driver to be guided in a straight line with great accuracy.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figure 1 is a sectional view showing the main parts of the present application, and is a sectional view taken along line AA in Figure 2, a vertical sectional view, and Figure 3 is a front view of Figure 2. 4
The figure is a sectional view taken along line BB in FIG. 2, and FIG. 5 shows another embodiment.

Claims (1)

[Claims] 1. A piston is fitted in a barrel in which an axial slit is formed in the side wall so as to be slidable in the axial direction, and a part of a driver connected to the piston is protruded from the slit. The slit is sealed with a band, a guide body equipped with a guide rail along the barrel axis is disposed outside the barrel, and the barrel and the guide body are connected so as to be relatively displaceable in the direction perpendicular to the barrel axis, and 1. A pressurized fluid cylinder, characterized in that a guide provided on the cylinder is guided by the guide rail to cause the driver to move accurately in a straight line. 2. The guide body is formed into a U-shaped cross section, and a barrel that can have a predetermined gap with the inner wall of the housing part of the guide body is installed inside the housing part, and the outer periphery of the insertion part of the end cap is attached to the inner end of this barrel. The end cap is fitted into the barrel with an O-ring interposed therebetween, and the end cap is integrally connected to the guide body so that the barrel and the guide body can be relatively displaced in a direction orthogonal to the barrel axis. The pressure fluid cylinder according to item 1.