JPH0712726Y2 - Rodless cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a fluid pressure driven rodless cylinder used for driving equipment, conveying objects and the like.

[Prior Art] A support guide member provided with a cylinder in the axial direction and a mover mechanically connected to the piston in the cylinder are provided, and the mover supports and guides as the piston moves due to fluid pressure. Rodless cylinders that move on members are already known.

The known rodless cylinder described above has a moving element depending on the location of a sliding surface that guides the movement of the moving element in order to provide a gap in the cylinder in the axial direction through which a connecting plate that connects the piston and the moving element is inserted. The gap may be expanded and the cylinder may be deformed due to a vertical load of a load attached to the moving element or a moment acting on the moving element. Even if the deformation of the cylinder is very slight, it hinders the smooth movement of the piston. Therefore, it is necessary to prevent the cylinder from being deformed.

[Problems to be Solved by the Invention] A problem to be solved by the present invention is a rodless structure in which a cylinder is not deformed by a vertical load of a moving element or a load attached to the moving element or a moment load acting on the moving element. To provide a cylinder.

[Means for Solving the Problems] In order to solve the above problems, a rodless cylinder of the present invention is configured such that a support guide member provided with a cylinder in the axial direction and a piston in the cylinder are mechanically coupled to each other. In a rodless cylinder provided with a mover that moves on the support guide member with movement, in the support guide member,
Horizontal rolling surfaces located on the left and right upper sides of the support guide member for receiving a vertical load of the moving element and a load attached to the moving element, and an axial upper ridge projecting between the horizontal rolling surfaces. A gap through which a connecting plate for coupling the piston and the mover passes through the upper protrusion, and an inclined rolling surface that is located above both side walls of the upper protrusion and is inclined with respect to the horizontal rolling surface. And a rolling element formed of a rolling bearing that rolls the horizontal rolling surface and the inclined rolling surface on the moving element that straddles the upper ridge, and is provided before and after the moving direction. I am trying.

[Operation] When the pressure fluid is supplied to one pressure chamber in the cylinder to drive the piston, the mover connected to the piston by the connecting plate moves on the support guide member while straddling the upper ridge.

In this case, the vertical load of the mover and the load attached to the mover is received by the horizontal rolling surfaces located on the upper left and right sides of the support guide member and does not act on the upper ridge. Does not spread, it is possible to prevent deformation of the cylinder due to vertical load.

In addition, since the mover that straddles the upper ridges is supported by the horizontal rolling surface below the upper ridges and moves, compared to the case where a horizontal rolling surface is provided on the upper surface of the upper ridges, the rodless cylinder The overall height can be reduced.

Further, the moving element is supported by a plurality of rolling wheels composed of rolling bearings provided in front of and behind the moving direction, and rolls on each horizontal rolling surface and an inclined rolling surface inclined with respect to these rolling surfaces. In order to move while moving, even if a moment load in the traveling direction or in the direction orthogonal to this is applied to the slider,
The resulting load is received as a force acting almost perpendicularly to the horizontal rolling surface on one side and the inclined rolling surface on the other side via the rolling wheels. The force hardly acts.

Therefore, each of the rolling wheels smoothly moves the moving element along the support guide member while restraining the posture of the moving element.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

The rodless cylinder shown in FIGS. 1 to 3 is mechanically connected to a support guide member 1 having a cylinder 2 in the axial direction and a piston 3 in the cylinder 2, and the support guide member is moved by the movement of the piston 3. And a mover 4 that moves on the member. The support guide member 1 is formed of an aluminum extruded material or the like so as not to be deformed by a load acting through the mover 4, and the mover 4 has a cross-sectional shape in the upper protrusion 5 of the support guide member 1. The shape is such that it straddles.

The horizontal rolling surfaces 7a, 7b arranged on the left and right of the cylinder 2 in the support guide member 1 are the left and right rolling wheels 8 provided on the moving element 4.
a and 8b are placed and roll, and the upper ridge 5 of the support guide member 1 is located close to the horizontal rolling surfaces 7a and 7b.
The inclined rolling surfaces 9a, 9b arranged on the upper portions of both side walls of the above have inclinations of about 135 ° in the opposite directions with respect to the surfaces of the horizontal rolling surfaces 7a, 7b. Rolling wheels 10a, 10b rolling on these inclined rolling surfaces 9a, 9b are provided.

In FIG. 1, in order to clearly show the structure, a rolling wheel 8a rolling on a horizontal rolling surface 7a is shown on the left side, and a rolling wheel 10b rolling on an inclined rolling surface 9b is shown on the right side. However, the rolling wheels 8a, 8b and the rolling wheels 10a, 10b are, before and after the moving direction of the moving element 4,
A pair of rolling wheels 8a and 10a and a pair of rolling wheels 8b and 10b are provided on the left and right, respectively, and eight rolling wheels are provided as a whole. Each of these rolling wheels is formed by a rolling bearing such as a ball bearing, and at least half of the rolling wheels are eccentric in order to adjust their mounting positions so that they roll in contact with each rolling surface. The support shaft 13 has a support hole and its support shaft
The moving element 4 is supported by the moving element 4, and the rotation of the supporting element 13 makes it possible to adjust the position in the contacting / separating direction with respect to the rolling surface. The number of the above-mentioned rolling wheels is not limited to eight.

On the other hand, the rolling surface on which each of the rolling wheels rolls, if necessary,
The surface of the extruded aluminum material forming the support guide member 1 is hardened, or a high hardness material such as a piano wire or a thin plate is attached along the rolling surface of the aluminum extruded material so as to cope with a high load.

In FIG. 1, reference numerals 15 and 15 denote fixing grooves for mounting a position detector for detecting the position of the piston 3, and 16 denotes a fixing tool for fixing the support guide member 1.

In the rodless cylinder having the above structure, when the piston 3 is driven by a mechanism described later, the moving element 4 connected to the piston moves on the support guide member 1. At that time, the rolling wheel provided on the moving element 4 is moved. 8a and 8b are left and right horizontal rolling surfaces 7
At the same time as rolling on a, 7b, the rolling wheels 10a, 10b roll on the inclined rolling surfaces 9a, 9b having an inclination of about 135 ° in the opposite directions with respect to the surface of each horizontal rolling surface 7a, 7b. Move.

In this case, since the horizontal rolling surfaces 7a and 7b are provided above both sides of the cylinder 2 in the axial direction, the vertical load of the mover 4 and a load (not shown) attached to the mover does not act on the cylinder 2. Then, since it acts on the support guide members 1 on both sides of the cylinder 2, it is possible to prevent the deformation of the cylinder due to the vertical load.

Further, since these rolling wheels are rolling bearings, the frictional resistance between the support guide member 1 and the moving element 4 is small, and even if a moment load acts on the moving element 4, the load associated therewith is changed. Substantially perpendicular to the horizontal rolling surface on one side and the slanted rolling surface on the other side, for example, the horizontal rolling surface 7a and the slanted rolling surface 9b, or the horizontal rolling surface 7b and the slanted rolling surface 9a via the wheels. Is received as a force that acts on each rolling wheel, and a force in the direction of shifting each rolling wheel from the rolling surface hardly acts.

Therefore, each rolling wheel restrains the posture of the mover 4,
The mover 4 is smoothly moved along the support guide member 1.

Next, a mechanism for moving the piston 3 together with the mover 4 will be described.

The cylinder 2 in which the piston 3 slides inside is provided with a groove 20 which is opened at the center of the above-mentioned protrusion 5 above the inside thereof, and the seal belts 21a and 21b made of a pair of elastic bodies are provided in the groove 20 at the center. It is fitted in a state in which they are joined to each other on the opposing flat surfaces 22a and 22b. The seal belts 21a and 21b have cross-sectional symmetrical shapes, and both outer surfaces form inclined surfaces 24a and 24b that widen on the center side of the cylinder 2, and engaging ribs are formed on the left and right outer sides of the upward protruding portion. 26a and 26b are projected so that they can be press-fitted into the groove 20 from the center side of the cylinder 2 and
In the state of being pushed into the cylinder 2 from 20, the facing flat surface 22
A gap is formed between a and 22b.

Both ends of the seal belts 21a, 21b are fixed to the end covers 28 of the cylinder 2, and in the closed state of the groove 20 shown in FIG. 1, the inner wall surface 29a of the groove 20 in which the center side of the cylinder tube 2 is expanded. The inclined surfaces 24a, 24b on both sides are pressed against the grooves 29, 29b, and the engaging ribs 26a, 26b projecting on both sides of the upper part are formed in the groove 20.
The inner side walls 29a and 29b of both the inclined surfaces 24a and 24b, the inner wall surfaces 29a and 29b of the groove 20, and the opposing flat surfaces 22a and 22b of both cylinders are pressed against each other by the internal pressure in the cylinder 2 by engaging with the recessed lines 30a and 30b. It is intended to be retained in. Further, the inner side surface 27 of the seal belt 21a, 21b facing the center side of the cylinder 27
The a and 27b are formed to have the same cylindrical surface as the inner surface of the cylinder when the groove 20 is closed.

The piston 3 and the mover 4 are connected by a thin connecting plate 31 led out between the seal belts 21a and 21b. At the lead-out position of the connecting plate 31, the seal belts 21a, 21a
By pushing b into the cylinder 2, a passage gap of the connecting plate 31 is formed between them, so that the mover 4 presses the upper surfaces of the upper protruding portions 25a and 25b of the seal belts 21a and 21b. 32 is provided, and the piston 3 is provided with an inner slope member 33 for recovering the pushed state of the seal belts 21a, 21b by the slope member 32 and holding the seal belts 21a, 21b in the state of FIG. There is. In this case, the connecting plate 31 connects the piston 3 and the mover 4 at the center of the piston 3, the slope members 32 are arranged on both sides of the connecting plate 31 in the moving direction of the mover 4, and the inner slope member 33 is provided. Are placed on both sides of the slope member 32 with a slight space, and the piston packing 34
Is provided.

In the figure, 35 is a supply port for supplying fluid pressure into one of the pressure chambers 36 in the cylinder 2, 37 is a cushion packing, and 38 is a supply port 35 when the piston 3 approaches in cooperation with the cushion packing 37. A cushion ring 39 that causes a cushioning effect by closing the
An elastic band that closes the upper surface of the groove 20 of the support guide member 1 in a portion where is not passed, and 40 is a guide for the elastic band 39.

In the rodless cylinder having the above structure, when the pressure fluid is supplied through the supply port 35 to move the piston 3, the mover 4 also moves accordingly, but at that time, in the portion where the connecting plate 31 moves, , Slope member
32 presses the seal belts 21a, 21b into the cylinder 2 to form a gap therebetween, so that the connecting plate 31
Pass through the gap. In this case, the portion in which the above-mentioned gap is formed and the pressure chamber 36 of the cylinder 2 have a piston packing.
Since it is partitioned by 34, the pressure fluid in the pressure chamber 36 does not leak directly from the gap.

After passing the piston 3, the inner slope member 33
Thus, the seal belts 21a and 21b are closed, and the closed state is maintained by the fluid pressure in the pressure chamber 36.

[Advantage of the Invention] In the rodless cylinder of the present invention, since the horizontal rolling surface does not act on the upper ridge due to the vertical load of the moving element and the load attached to the moving element, the clearance provided on the upper ridge is increased. It is possible to prevent deformation of the cylinder due to expansion of the cylinder.

Further, since each rolling wheel provided on the mover straddling the upper protrusion rolls on the horizontal rolling surface and the inclined rolling surface below the upper protrusion, the overall height of the rodless cylinder should be reduced. You can

Further, by providing the rolling wheels composed of the rolling bearings rolling on the respective horizontal electric surfaces and the inclined rolling surfaces before and after the moving direction of the moving element, the frictional resistance between the support guide member and the moving element is small, and Since these rolling wheels receive a moment load in the moving direction of the moving element and in a direction orthogonal to the moving direction, the moving wheels can be smoothly moved while restraining the moving posture of the moving element. "

[Brief description of drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 3 showing an embodiment of a rodless cylinder according to the present invention, FIG. 2 is a sectional view taken along line BB of FIG. 3, and FIG. It is a sectional side view. 1 ... Support guide member, 2 ... Cylinder 3 ... Piston, 4 ... Mover 7a, 7b ... Horizontal rolling surface, 9a, 9b ... Inclined rolling surface 8a, 8b, 10a, 10b. ring

Claims (1)

[Scope of utility model registration request] 1. A rod provided with a support guide member provided with a cylinder in the axial direction, and a mover mechanically coupled to the piston in the cylinder and moving on the support guide member as the piston moves. In the less cylinder, a horizontal rolling surface is provided on the support guide member on the left and right upper sides of the support guide member and receives a vertical load of the moving element and a load attached to the moving element, and between the horizontal rolling surfaces. An upper projection protruding in the axial direction is provided, and a gap through which a connecting plate that connects the piston and the mover passes through the upper projection, and the horizontal rolling located above both side walls of the upper projection. An inclined rolling surface which is inclined with respect to the surface, and a rolling element formed of a rolling bearing rolling between the horizontal rolling surface and the inclined rolling surface is provided on a moving element that straddles the upper ridge. It is characterized that it is provided before and after the direction, respectively. And rodless cylinder.