JP7544884B2 - Membrane Throttle - Google Patents

Description

The present invention relates to a hydrostatic linear slide, and more specifically to a membrane throttle for use in a hydrostatic linear slide.

A hydrostatic linear slide fills the oil chamber of a block with lubricating oil at a constant pressure, and moves the block linearly along a rail while keeping objects from touching each other via an oil film made of lubricating oil. To increase the rigidity and stability of the oil film, it is common to place a throttle between the oil supply end and the oil chamber and use the throttle to control the flow rate of the lubricating oil. Conventional arrangements combine the oil chamber and throttle in a one-to-one relationship, which not only increases costs but also limits the available space.

In the flow rate controller of the hydrostatic device disclosed in Patent Document 1, the thin film deforms in response to changes in the load pressure and changes the volume of the plenum chamber to control the flow rate of the oil outflow hole. However, in Patent Document 1, the annular plenum chamber is not designed to uniformly distribute pressure, so the thin film that can withstand the pressure from the plenum chamber cannot deform uniformly, which affects the flow rate control effect.

In the hydrostatic linear system disclosed in Patent Document 2, the flow control member is connected to multiple hydrostatic oil chambers in the block body by oil supply tubes to supply high-pressure oil. However, Patent Document 2 uses a general structure and does not specifically disclose the flow control effect.

CN216742467U publication CN209925429U publication

The main objective of the present invention is to provide a membrane throttle that can achieve improved rigidity and stability.

To solve the above problems, the membrane throttle comprises a body, one or more caps, and one or more membranes. The body has an oil inlet passage, one or more oil outlet passages, one or more flow control portions, and one or more membrane holders. The flow control portion has a flow control surface and a flow control passage. The flow control passage has one end passing through the flow control surface and another end connected to an oil outlet passage in the body. The membrane holder is annularly disposed around the flow control portion and has a plurality of equally spaced concave grooves disposed toward the flow control portion. The cap is mounted within the body. The membrane is disposed between the membrane holder in the body and the cap.

As described above, the membrane throttle of the present invention uses multiple equally spaced concave grooves to create uniform pressure on the membrane, causing the membrane to deform uniformly, improving rigidity and stability.

In a more preferred embodiment, the body has one or more lower pressure grooves. The lower pressure grooves are disposed between the flow control portion and the membrane holder and are connected to the oil inlet passages and the multiple recessed grooves of the body. The cap has upper pressure grooves corresponding to the lower pressure grooves and connected to the oil inlet passages of the body. The above-mentioned structural features allow the pressure-resistant membrane to be uniformly deformed.

In a more preferred embodiment, the main body has an oil inlet groove penetrating the membrane holder. The oil inlet passage of the main body is indirectly connected to the upper pressure groove and the lower pressure groove via the oil inlet groove. In the main body, the multiple concave grooves and the oil inlet groove have the same width and are equally spaced toward the flow control portion. The above-mentioned structural features allow the pressure-resistant membrane to be uniformly deformed.

In a relatively preferred embodiment, the cap has a top surface, a bottom surface, and an oil inlet hole. The oil inlet hole passes through the top surface and the bottom surface and connects to the oil inlet groove of the body and the upper pressure groove of the cap. The bottom surface of the cap has a positioning portion that annularly surrounds the upper pressure groove. The thin film is disposed between the thin film holder of the body and the positioning portion of the cap, providing a good positioning effect.

In a relatively preferred case, the gap is between 80 μm and 90 μm. The above-mentioned structural features can produce a good flow control effect.

In a more preferable case, the oil outflow passage, flow control section, membrane holder, lower pressure groove, cap and membrane of the main body are arranged in twos according to actual needs. In contrast, the membrane throttle of the present invention uses two oil chambers. The above-mentioned structural features can reduce costs and increase usable space.

The detailed structure, features, assembly and usage of the membrane throttle of the present invention will be made clear through the detailed description of the following embodiment. It should be understood by anyone with common sense in the field of the present invention that the detailed description below and the embodiment disclosed by the present invention are merely examples for explaining the present invention and cannot limit the scope of the claims of the present invention.

FIG. 1 is a perspective view showing a membrane throttle according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a membrane throttle according to an embodiment of the present invention. 1 is a top plan view showing a base of a membrane throttle according to one embodiment of the present invention, three concave grooves arranged on the base, and a thin membrane. FIG. 1 is a top plan view showing a base of a membrane throttle according to one embodiment of the present invention, two concave grooves disposed on the base, and a thin membrane. FIG. 1 is a cross-sectional view of a membrane throttle according to an embodiment of the present invention; FIG. 1 is a vertical cross-sectional view showing a membrane throttle according to an embodiment of the present invention. FIG. 7 is an enlarged view showing part A in FIG. 6 . FIG. 1 is a perspective view of a hydrostatic device according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of a portion of a hydrostatic device according to one embodiment of the present invention. 4 is a cross-sectional view showing a state in which a rail and a block are coupled together in the hydrostatic device according to the embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view of a flow control tube of a hydrostatic device according to an embodiment of the present invention. 5 is a graph showing different stiffnesses of blocks bearing different loads according to the size of the aperture of a flow control hole in the hydrostatic device according to an embodiment of the present invention; FIG. 2 is a plan view of one end of a hydrostatic device according to an embodiment of the present invention with a block in a compressed state; FIG. 2 is a plan view from one end of a hydrostatic device according to an embodiment of the present invention with a block in tension;

The membrane throttle of the present invention will now be described with reference to the drawings. Note that in the specification and drawings, directional terms are expressed based on the directions in the drawings. The same reference numerals indicate structural features of the same or similar parts.

(One embodiment)
As shown in FIGS. 1 and 2, a membrane throttle 10 according to one embodiment of the present invention comprises a body 20, two caps 30 and two membranes 40.

The body 20 has a base 21 and a lid 22. The base 21 has four first screw holes 212 and two second screw holes 214 on the top surface. The lid 22 has a first countersunk hole 222 penetrating the four top and bottom surfaces and a second countersunk hole 224 penetrating the two top and bottom surfaces. The base 22 and the lid 21 are fixed together by inserting four first countersunk holes 222 and tightening them into the four first screw holes 212, and inserting two second countersunk screws S2 into the two first countersunk holes 224 and tightening them into the two first screw holes 214.
As shown in Figures 2, 5 and 6, the base 21 has an oil inlet passage 23, an oil inlet groove 24, two opposing oil outlet passages 25, two opposing flow control portions 26, two opposing thin film holders 27, two opposing downward pressure grooves 28 and two opposing convex edges 29. The oil inlet passage 23 has one end serving as an oil inlet 232 located on the side of the body 20, and another end connected to the oil inlet groove 24. The two opposing oil outlet passages 25 are located on opposite sides of the oil inlet passage 23, and each has one end serving as an oil outlet 252 located on the same side of the body 20. The two opposing flow control portions 26 each have a flow control surface 262 and a flow control passage 264. One end of each of the flow control passages 264 passes through the flow control surface 262, and the other end connects to the oil outlet passage 25 (see Figure 6). The two opposing thin film holders 27 are each arranged in an annular shape around the flow control portion 26, and their height is greater than that of the flow control portion 26. The oil inlet groove 24 connects to two opposing membrane holders 27. Each membrane holder 27 has a number of grooves 272. The number of grooves 272 can be three (see FIG. 3) or two (see FIG. 4) according to actual needs. This embodiment takes three grooves 272 as an example.
In the main body 20, the plurality of concave grooves 272 and the oil inlet groove 24 have the same width and are equally spaced toward the flow control portion 26. The two opposing downward pressure grooves 28 are respectively disposed between the flow control portion 26 and the membrane holder 27 and connected to the plurality of concave grooves 272, and are indirectly connected to the oil inlet passage 23 through the oil inlet groove 24. The two opposing convex edges 29 are respectively located above the membrane holder 27, and are annularly arranged around the membrane holder 27, with a plurality of equally spaced fixing holes 292. The oil inlet groove 24 is connected to the two opposing convex edges 29. In this embodiment, the number of fixing holes 292 is not particularly limited.

Each of the two caps 30 has a top surface 31, a bottom surface 32, an oil supply hole 33 penetrating the top surface 31 and the bottom surface 32, and a plurality of perforations 34 penetrating the top surface 31 and the bottom surface 32. Each of the caps 30 has an annular positioning portion 35 and an upper pressure groove 36 on the bottom surface 32. The upper pressure groove 36 is surrounded by the positioning portion 35 and is connected to the oil supply hole 33 along the axial direction.
2 and 6, the two caps 30 are mounted in the base 21. The caps 30 and the base 21 are fixed together by inserting a number of fixing members, such as screws (not shown in the figures), into the number of drilled holes 34 and tightening them into the number of fixing holes 292. Due to the above-mentioned structural features, the upper pressure groove 36 corresponds to the lower pressure groove 28 and is indirectly connected to the oil inlet passage 23 through the oil feed hole 33.

The membrane 40 is made of a metal material. As shown in FIG. 2 and FIG. 6, the membrane 40 is disposed between the upper pressure groove 36 and the lower pressure groove 28, and between the membrane holder 27 of the body 20 and the positioning portion 35 of the cap 30. As shown in FIG. 7, the height of the membrane holder 27 is greater than the height of the flow control portion 26, so there is a gap G between the bottom surface 42 of the membrane 40 and the flow control surface 262 of the flow control portion 26 of the body 20. The gap G contacts the lower pressure groove 28 and the flow control passage 264. In this embodiment, the gap G is between 80 μm and 90 μm. The above-mentioned structural features can produce a good flow control effect.

Due to the above-mentioned structural features, when hydraulic oil flows from the oil inlet passage 23 into the body 20 and is divided into upper and lower two parts, as shown in Figure 6, one part of the oil flows from the oil inlet groove 24 of the body 20 through the oil feed hole 33 into the upper pressure groove 36. Another part of the oil flows from the oil inlet groove 24 of the body 20 into the lower pressure groove 28 and the plurality of concave grooves 272, then passes through the gap G into the flow control passage 264, and then flows from the flow control passage 264 through the oil outlet passage 25 of the body 20 to the outside of the body 20.
When the hydraulic oil flowing out of the oil outlet passage 25 of the main body 20 bears a load, the thin film 40 is bent upward and deformed by the action of the hydraulic pressure in the downward pressure groove 28 and the plurality of concave grooves 272, and the gap G is increased, so that the flow rate of the hydraulic oil flowing from the downward pressure groove 28 through the flow control passage 264 to the oil outlet passage 25 of the main body increases. At this time, the flow control effect is exerted, and the load rigidity can be improved. When the load disappears, the pressure received by the thin film 40 disappears, so that the thin film 40 returns to its original state. In other words, as shown in Figures 3 and 4, the membrane throttle 10 of the present invention generates uniform pressure on the thin film 40 by the plurality of equally spaced concave grooves 272 and the downward pressure groove 28, and uniformly deforms and stabilizes the thin film 40, thereby improving its rigidity and stability.

The structure of the main body 20 may be changed according to the actual situation. For example, the main body 20 may have one or more oil outlet passages 25, flow control parts 26, thin film holders 27, downward pressure grooves 28 and convex edges 29. Meanwhile, the cap 30 and thin film 40 may also have one or more. The above-mentioned structure can also make the thin film 40, which is resistant to pressure, uniformly deform and stabilize it.

(One embodiment)
As shown in FIGS. 8 and 9, a hydrostatic device 50 according to an embodiment of the present invention includes a membrane throttle 10, a rail 60, a block 70, an oil flow path connecting block 80, and two flow control pipes 90.

As shown in FIG. 10, the rail 60 has first load sections 61 on the upper and lower sides of opposite sides. Each first load section has a first load surface 62.

As shown in FIG. 10, the block 70 is slidably mounted on the rail 60 and has second load sections 71 on the opposite left and right sides. Each second load section 71 has a second load surface 72 on the opposite top and bottom sides. Each second load surface 72 of the block 70 corresponds to the first load surface 62 of the rail 60. Each second load surface 72 of the block 70 has an oil chamber 73. The block 70 further has two first oil inlet passages 74 and two second oil inlet passages 75. The two first oil inlet passages 74 and the two second oil inlet passages 75 are symmetrically arranged on the top and bottom of the outside of the two second load sections 71, and are connected to the oil chamber 73 via an oil supply passage 76. In this embodiment, the number of oil supply passages 76 is not particularly limited.

As shown in FIG. 9, the oil flow path connection block 80 is mounted between the block 70 and the membrane throttle 10, and has two opposing first connection passages 81 and two opposing second connection passages 82 inside. One end of each of the first connection passages 81 is connected to the first oil inflow passage 74, and the other end is connected to an oil supply source (not shown in the figure) together with the oil inflow passage 23 of the membrane throttle 10. One end of each of the second connection passages 82 is connected to the second oil inflow passage 75, and the other end is connected to the oil outflow passage 25 of the membrane throttle 10 via a tube 83.

As shown in Fig. 11, the two flow control pipes 90 each have a head portion 91, a thread portion 92, an oil outflow passage 93, and a flow control hole 94. The thread portion 92 is connected to the head portion 91. The oil outflow passage 93 penetrates the head portion and extends to the back of the thread portion 92. The flow control hole 94 is formed at the end of the thread portion 92 and connects to the oil outflow passage 93 on the axial direction. In order to smoothly tighten and fix the flow control pipes 90, the cross section of the oil outflow passage 93 is formed in a dish shape. The diameter of the flow control hole 94 is between 0.1 mm and 0.3 mm.
9 , the flow control pipe 90 is fastened in the first connecting passage 81 by a meshing manner, and is connected to the first oil inlet passage 74 of the block 70 through an oil outlet passage 93, and at the same time controls the flow rate of the hydraulic oil flowing into the first connecting passage 81 through a flow control hole 94. That is, the flow control pipe 90 controls the flow rate of the hydraulic oil through the flow control hole 94, and then transports the hydraulic oil into the first oil inlet passage 74 of the block 70 through the oil outlet passage 93.

Fig. 12 is a graph showing the different stiffness of block 70 withstanding different loads depending on the size of the aperture of flow control hole 74. More specifically, as shown in Fig. 13a, when block 70 withstands load F in the compression direction, load F is shown as a positive number in Fig. 12. As shown in Fig. 13b, when block 70 withstands load F in the tension direction, load F is shown as a negative number in Fig. 12. Since block 70 often withstands load F in the pressure direction, the stiffness corresponding to the compression direction in Fig. 12 can be used as a reference.
12, when the diameter d is between 0.1 mm and 0.3 mm, the peak value of the stiffness of the block 70 appears in the compression direction. When the diameter d is 0.4 mm or more, the peak value of the stiffness of the block 70 appears in the tension direction. In other words, it is most preferable that the diameter d of the flow control hole 94 is between 0.1 mm and 0.3 mm.

When the hydrostatic device 50 is operating, a portion of the hydraulic oil from the oil supply source flows into the two first connecting passages 81 of the oil flow passage connecting block 80, and after the flow rate is controlled by the two flow control pipes 90, flows through the two first oil inlet passages 74 of the block 70 into the two upper oil chambers 73 of the block 70. Another portion of the hydraulic oil flows into the membrane throttle 10, and after the flow rate is controlled by the gap G, flows from the tube 83 into the two second connecting passages 82 of the oil flow passage connecting block 80, and then flows from the two second connecting passages 82 through the two second oil inlet passages 75 of the block 70 into the two lower oil chambers 73 of the block 70.
Due to the above-mentioned structural features, the lubricating oil forms a layer of oil film (not shown in the figure) between the first loaded surface 72 of the rail 60 and the second loaded surface 72 of the block 70 through the oil chamber 73, and the block 70 can move smoothly linearly along the rail 60 while keeping the objects from contacting each other. When the block 70 bears a load, the oil chamber 73 bearing the load reduces the thickness of the oil film, and the pressure increases, which increases the pressure in the flow control passage 264 of the main body 20. When the pressure in the flow control passage 264 increases and the thin film 40 protrudes, the pressure control and flow control can be adjusted by the gap G, and the load stiffness can be increased.

In summary, the hydrostatic device 50 of the present invention adopts a method of matching the membrane throttle 10 with the multiple oil chambers 73 of the block 70, so compared to the conventional technology, only one set of membrane throttles 10 is required. In other words, compared to the conventional technology, it is possible to reduce costs, reduce costs, and increase usable space. In addition, the hydrostatic device 50 of the present invention can achieve high rigidity by combining and arranging the membrane throttle 10 and the flow control pipe 90.

10 membrane throttle 20 body 21 base 212 first screw hole 214 second screw hole 22 cover 222 first countersink 224 second countersink 23 oil inlet passage 232 oil inlet 24 oil inlet groove 25 oil outlet passage 252 oil outlet 26 flow control section 262 flow control surface 264 flow control passage 27 membrane holder 272 concave groove 28 lower pressure groove 29 convex edge 292 fixing hole 30 cap 31 top surface 32 bottom surface 33 oil supply hole 34 perforation 35 positioning section 36 upper pressure groove 40 membrane 42 bottom surface 50 hydrostatic device 60 rail 61 first load section 62 first load surface 70 block 71 second load section 72 Second load surface 73 Oil chamber 74 First oil inlet passage 75 Second oil inlet passage 76 Oil supply passage 80 Oil flow path connection block 81 First connection passage 82 Second connection passage 83 Tube 90 Flow control tube 91 Head portion 92 Thread portion 93 Oil outlet passage 94 Flow control hole D Diameter of flow control hole G Clearance S1 First countersunk head screw S2 Second countersunk head screw

Claims (3)

A body, two caps and two membranes;
The body has an oil inlet passage, two oil outlet passages, two flow control sections , two membrane holders and two lower pressure grooves ;
the flow control portion has a flow control surface and a flow control passage;
one end of the flow control passage penetrates the flow control surface and another end of the flow control passage is connected to the oil outflow passage,
the thin film holder is configured to surround the flow rate control portion in an annular shape and has a plurality of grooves;
The plurality of concave grooves are formed in a shape directed radially outward from the flow rate control portion, are disposed at equal intervals, and are indirectly connected to the oil inflow passage and the oil outflow passage,
The downward pressure groove is disposed between the flow control portion and the thin film holder, and is connected to the plurality of concave grooves and indirectly connected to the oil inlet passage;
The cap is mounted within the body;
The cap has an upper pressure groove corresponding to the lower pressure groove and indirectly connected to the oil inlet passage,
The thin film is disposed between the thin film holder of the body and the cap.
Membrane throttle. The body further has an oil inlet groove extending radially outward from the flow rate control portion and penetrating the thin film holder;
the lower pressure groove is indirectly connected to the oil inlet passage via the oil inlet groove,
2. The membrane throttle of claim 1 , wherein the recessed grooves and the oil inlet grooves have the same width and are equally spaced apart from one another . the cap has a top surface, a bottom surface and an oil supply hole, the oil supply hole penetrates the top surface and the bottom surface and connects to the oil inlet groove of the body and the upper pressure groove of the cap, the bottom surface of the cap has a positioning portion annularly surrounding the upper pressure groove,
The membrane throttle of claim 1 , wherein the membrane is disposed between the membrane holder of the body and the positioning portion of the cap.

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