JP2010242953A - Flow amount throttle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow amount throttle device having relatively simple construction for easily adjusting a throttle amount while achieving a smaller size. <P>SOLUTION: The flow amount throttle device includes a shaft body 101, and a housing 102 having a through-hole 111. A clearance 120 is provided between an inner wall portion 101a of the through-hole 111 and part of a peripheral wall portion 101b of the shaft body 101. The housing 102 has an introduction passage 112 communicated with the clearance 120 for introducing pressure oil 51 into the clearance 120, and a discharge passage 113 for discharging the pressure oil 51 from the clearance 120 to the outside of a system. Thereby, the flow amount of the pressure oil 51 is adjusted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a flow restrictor for reducing the flow rate of a fluid.

  A flow restrictor is widely used to adjust the flow rate of a fluid such as pressure oil for operating an actuator such as a hydraulic cylinder used as a drive source for a tool or column feed mechanism in a machine tool, for example. It's being used.

  As the above-described flow restrictor, for example, Patent Document 1 has a valve portion that can be inserted into a valve hole at the tip, and a closed position where the valve portion is inserted into the valve hole and a predetermined amount from the valve hole. A shaft that can move linearly between the open position and a valve seat that is attached to the shaft and that closes the periphery of the valve hole when the valve portion is in the closed position. Disclosed is a flow control valve that has a hole communicating with the distal end on the insertion side, and allows a constant flow rate of fluid to pass through the hole when the valve is in a predetermined range near the closed position. .

JP 2002-349722 A (see, for example, paragraphs [0010] to [0015], [FIG. 1], [FIG. 2], etc.)

  However, in the flow control valve described in Patent Document 1 described above, although the flow rate of the fluid can be adjusted, a valve seat is attached to the shaft and a coil spring that biases the valve seat toward the valve hole is attached. In addition, the flow control valve itself becomes large and complicated.

  Therefore, the present invention has been proposed in view of the above-described problems, and an object of the present invention is to provide a flow restrictor that can easily adjust the throttle amount and can be downsized with a relatively simple configuration. .

The flow restrictor according to the first invention for solving the above-described problem is as follows.
A shaft,
A housing having an insertion hole through which the shaft is inserted;
While providing a gap in a part of the inner wall portion of the insertion hole and the peripheral wall portion of the shaft body,
The flow rate of the fluid is adjusted by providing the housing with an introduction path communicating with the gap and introducing a fluid into the gap and a discharge path for discharging the fluid introduced into the gap out of the system. Features.

The flow restrictor according to the second invention for solving the above-described problem is as follows.
A flow restrictor according to a first invention,
The introduction path and the discharge path have a shape extending in the extending direction of the insertion hole.

A flow restrictor according to a third invention for solving the above-described problem is as follows.
A flow restrictor according to a first invention,
The introduction path and the discharge path have a shape extending in a radial direction of the insertion hole.

A flow restrictor according to a fourth invention for solving the above-described problem is as follows.
A shaft,
A housing having an insertion hole through which the shaft is inserted;
Forming a part of the insertion hole larger in diameter than the shaft body and providing a gap between the inner wall portion of the insertion hole and the peripheral wall portion of the shaft body;
A first path having a shape communicating with the gap and extending in the radial direction of the insertion hole is provided in the housing, and a second path having a shape extending in the extending direction of the insertion hole is provided in the housing.
The shaft body is provided with a large-diameter portion that is in sliding contact with the inner wall portion of the large-diameter portion of the insertion hole, and a hole portion that communicates the gap and the second path is provided in the shaft body.
The fluid is circulated through the first path, the gap, the hole, and the second path, and the flow rate is adjusted.

A flow restrictor according to a fifth invention for solving the above-described problem is as follows.
A flow restrictor according to a fourth invention,
A fixing means for fixing the shaft body to the housing is further provided.

  According to the flow restrictor according to the present invention, with the above-described configuration, it is easy to adjust the throttle amount with a relatively simple configuration, and the size can be reduced.

It is the schematic which shows a gantry type machining center. FIG. 2 is an enlarged view of a surrounding line II in FIG. 1. It is a top view of the linear motion guide apparatus of the machine tool which comprises the flow-rate restrictor which concerns on 1st embodiment of this invention. It is the IV-IV sectional view taken on the line in FIG. It is a front view of the linear motion guide apparatus of the machine tool which comprises the flow-rate restrictor which concerns on 1st embodiment of this invention. It is the VI-VI sectional view taken on the line in FIG. It is a perspective view of the shaft body which the flow restrictor concerning a 1st embodiment of the present invention comprises. It is explanatory drawing of the flow restrictor which concerns on 2nd embodiment of this invention. It is explanatory drawing of the flow restrictor which concerns on 3rd embodiment of this invention.

  Each embodiment of the flow restrictor according to the present invention will be described in detail.

[First embodiment]
A first embodiment of a flow restrictor according to the present invention will be described with reference to FIGS.
FIG. 1 is a schematic view showing a gantry type machining center. FIG. 2 is an enlarged view of a surrounding line II in FIG. FIG. 3 is a plan view of a linear motion guide device for a machine tool including the flow restrictor according to the first embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a front view of a linear motion guide device for a machine tool including a flow restrictor according to the first embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a perspective view of a shaft body included in the flow restrictor according to the first embodiment of the present invention.

  In the present embodiment, a case where the present invention is applied to a linear motion guide device for a machine tool provided in a gantry machining center will be described.

  As shown in FIG. 1, the machine tool according to the present embodiment includes a table 2 that is immovable and a pair of left and right beds 3 and 4 that are provided on both sides of the table 2. A portal column 5 is provided on the left and right beds 3 and 4. A cross rail 8 is stretched over the left and right column bodies 6 and 7 of the portal column 5, and a saddle 9 is reciprocally movable in the horizontal direction (left and right direction in the figure: X-axis direction) on the cross rail 8. It is supported. A ram 10 is supported on the saddle 9 so as to be reciprocally movable in the vertical direction (vertical direction in the figure: Z-axis direction).

  In the machine tool described above, the portal column 5 is provided on the beds 3 and 4 so as to be linearly movable in a horizontal direction perpendicular to the X-axis direction (direction perpendicular to the paper surface in the drawing: Y-axis direction).

  The upper portion of the left bed 3 is provided with two guide rails 21 and 22 that protrude upward and project outward to the left bed 3 and extend in the Y-axis direction (direction perpendicular to the drawing sheet). ing. These guide rails 21 and 22 are arranged in parallel in the X-axis direction. Here, the column base 12 is provided in the lower part of the left column main body 6 mentioned above. At the lower part of the column base 12, there are provided three protrusions 23, 24, 25 protruding downward. The left protruding portion 23 and the central protruding portion 24 are formed so as to be slidable on the left guide rail 21, while the right protruding portion 25 is formed with the right guide rail 22 and a gap D3. A support member 26 that supports the protruding portion 21c of the left guide rail 21 from below is provided at the lower end of the left protruding portion 23. A support member 27 that supports the protrusion 22c of the right guide rail 22 from the lower side is provided at the lower end of the right protrusion 25. Therefore, the left column main body 6 can move in the Y-axis direction along the guide rails 21 and 22 on the guide rails 21 and 22, but cannot move in the X-axis direction.

  As shown in FIGS. 1 and 2, the upper portion of the right bed 4 protrudes upward, protrudes outward of the right bed 4, and extends in the Y-axis direction (direction perpendicular to the drawing sheet). Two guide rails 31 and 32 are provided. These guide rails 31 and 32 are arranged in parallel in the X-axis direction. Here, the column base 11 is provided in the lower part of the right column main body 7 mentioned above. The lower portion of the column base 11 is provided with three protrusions 33, 34, and 35 protruding downward, so that the column base 11 is relatively movable along the guide rails 31 and 32. . An upper surface 31 d of the left guide rail 31 is formed so as to be slidable in contact with the left recess 11 a of the column base 11. An upper surface 32 d of the right guide rail 32 is formed so as to be slidable in contact with the right recess 11 b of the column base 11. A gap D <b> 1 is provided between the right side portion 32 a of the right guide rail 32 and the left side portion 35 b of the right protruding portion 35. A support member 36 that supports the protrusion 31c of the left guide rail 31 from below is provided at the lower end of the left protrusion 33. A support member 37 that supports the protrusion 32c of the right guide rail 32 from the lower side is provided at the lower end of the right protrusion 35.

  A housing 42 having a sliding body 41 is provided between the right side portion 33a of the left side protruding portion 33 and the left side portion 31b of the left guide rail 31, and the housing 42 is provided on the right side portion 33a and the left concave portion 11a of the left side protruding portion 33. It is fixed. Further, a housing 42 having a sliding body 41 is similarly provided between the left side 34b of the central protrusion 34 and the right side 31a of the left guide rail 31, and the housing 42 is provided with the left side 34b of the central protrusion 34 and It is fixed to the left recess 11a.

  As shown in FIGS. 1 to 6, the housing 42 is provided with an advancing / retreating device that advances and retracts the sliding body 41 with respect to the left side (sliding surface) 31 b or the right side (sliding surface) 31 a of the left guide rail 31. It has been. The advance / retreat apparatus includes a hydraulic cylinder 44 provided in a housing 42, and a piston rod 45 that is accommodated in the hydraulic cylinder 44 and that has a sliding body 41 provided at a tip portion thereof. The advance / retreat apparatus further includes a hydraulic passage 70 through which a hydraulic pressure 51 that is a fluid to the hydraulic cylinder 44 flows. An O-ring 47 is disposed in the recess 45 a of the piston rod 45, and the O-ring 47 prevents leakage of the hydraulic pressure 51 in the cylinder 44.

  The advancing / retreating devices are provided at a plurality of locations in the movement direction of the housing 42, that is, three locations in the illustrated example. Thus, by providing the advancing / retreating devices at a plurality of locations, the advancing / retreating movement of the sliding body 41 with respect to the left guide rail 31 can be performed smoothly.

  The hydraulic passage 70 includes an introduction part 71, a distribution part 72, a communication part 73, and discharge parts 81 to 83. The introduction portion 71 communicates with a hydraulic supply source (not shown) outside the system, and is provided to extend linearly in the left-right direction as shown in FIGS. 4 and 5. The hydraulic pressure 51 is introduced into the interior of 42. The distribution unit 72 is provided in communication with the introduction unit 71 and the hydraulic cylinder 44. The communication part 73 has a shape extending in the vertical direction, and is provided in communication with the introduction part 71 and specifically, a first discharge part 81 described later. The discharge portion includes a first discharge portion 81 that extends linearly in the left-right direction, a second discharge portion 82 that communicates with the first discharge portion 81 and extends linearly in the vertical direction, and the second discharge portion. And a third discharge portion 83 that communicates with the vicinity of the lower end of 82 and outside the system and extends linearly in the left-right direction. The diameter of the first discharge portion 81 is formed smaller in the vicinity of the left end portion than in other portions. Therefore, the hydraulic pressure 51 introduced into the introduction portion 71 of the hydraulic passage 70 is supplied to each hydraulic cylinder 44 through the introduction portion 71 and the distribution portion 72, and passes through the communication portion 73 and the discharge portions 81 to 83. It is discharged outside. In addition, the closing member 61 is arrange | positioned at the upper end part of the connection part 73, and the upper end part of the 2nd discharge part 82, respectively. In addition, a closing member 62 is disposed at the right end portion of the first discharge portion 81.

  Therefore, by supplying / discharging the hydraulic pressure 51 to / from the hydraulic cylinder 44 via the hydraulic passage 70, the sliding body 41 disposed between the left protruding portion 33 and the left guide rail 31 is replaced with the left guide rail. The sliding body 41 can be moved back and forth with respect to the left side portion (sliding surface) 31 b of the 31, and in the sliding body 41 disposed between the central protruding portion 34 and the left guide rail 31, the sliding body 41 is moved to the left guide rail 31. Can be moved forward and backward with respect to the right side (sliding surface) 31a.

  The first discharge portion 81 in the hydraulic passage 70 described above is provided with a hydraulic throttle device (flow rate throttle device) 90 that throttles the flow rate of the hydraulic pressure 51. As shown in FIGS. 6 and 7, the hydraulic throttle device 90 includes a shaft body 91 disposed with a gap D <b> 2 between the first discharge portion 81 (insertion hole) of the hydraulic passage 70 and the inner wall portion 81 a. . The shaft body 91 is formed with a locking portion 91a which is locked to the closing member 62 at one end portion, and grooves 91b and 91c are respectively formed on the peripheral surface in the vicinity of the one end portion and in the vicinity of the other end portion. ing. The shaft body 91 is formed to have a diameter smaller than the diameter of the first discharge portion 81 except for the vicinity of both ends of the shaft body 91. Therefore, by arranging the shaft body 91 in the first discharge portion 81, the hydraulic pressure 51 passes outside the system through the first discharge portion 81, the second discharge portion 82, and the third discharge portion 83 of the hydraulic passage 70. When discharging, the flow rate is restricted by the shaft body 91 and gradually flows.

  The sliding body 41 is provided with a lubricating oil supply passage (not shown) for supplying lubricating oil, and the lubricating oil is supplied to the sliding surface 41 a of the sliding body 41.

  Therefore, the column base 11 can be moved via the sliding body 41 along the guide rail (first member) 31 on the stationary side of the machine by the above-described linear motion guide device for the machine tool.

  After the column base 11 is disposed at a predetermined position on the right bed 4, the hydraulic pressure 51 is supplied into the hydraulic cylinder 44 through the introduction portion 71 and the distribution portion 72 of the hydraulic passage 70, whereby the piston rod 45 moves forward. Thereby, the sliding body 41 presses against the left guide rail 31 of the right bed 4 and the column base 11 is fixed to the left guide rail 31 of the right bed 4.

  Here, when the column base 11 is fixed to the right bed 4 by the linear motion guide device having the above-described configuration, vibration of a tool or the like attached to the ram 10 acts on the linear motion guide device via the column base 11. The case where the force due to thermal expansion of the left and right column bodies 6 and 7 acts on the linear motion guide device via the column base 11 will be described.

  When vibration of a tool or the like attached to the ram 10 acts on the linear motion guide device via the column base 11, a force for moving the piston rod 45 backward acts on the piston rod 45 and the hydraulic pressure in the hydraulic cylinder 44. Although 51 is to be discharged to the hydraulic circuit 70, the hydraulic throttle device 90 restricts the discharge amount of the hydraulic pressure 51 from the hydraulic circuit 70 to the outside of the system, and the hydraulic pressure 51 flows only gradually. Therefore, the hydraulic throttle device 90 exhibits a resistance against the force that causes the piston rod 45 to move backward. In other words, the linear motion guide device fixes the column base 11 to the left guide rail 31 of the right bed 4 while expressing a resistance against the vibration described above.

  When a force due to thermal expansion of the left and right column bodies 6 and 7 acts on the linear motion guide device via the column base 11, a force for moving the piston rod 45 backward acts on the piston rod 45, and this force is heated. It gradually increases according to the magnitude of expansion. At this time, the hydraulic pressure 51 passes from the inside of the hydraulic cylinder 44 through the distribution section 72 and the communication section 73 of the hydraulic circuit 70, the first discharge section 81, the hydraulic throttle device 90, the second discharge section 82, and the third discharge section 83. It is gradually discharged out of the system. Thereby, the linear motion guide device can absorb the force due to the thermal expansion described above while fixing the column base 11 to the left guide rail 31 of the right bed 3.

  Therefore, according to the flow restrictor according to the present embodiment, with the above-described configuration, the throttle amount can be easily adjusted and the size can be reduced with a relatively simple configuration.

[Second Embodiment]
A second embodiment of the flow restrictor according to the present invention will be described with reference to FIG.
FIG. 8 is an explanatory diagram of a flow restrictor according to the second embodiment of the present invention.

  As shown in FIG. 8, the flow restrictor according to the present embodiment includes a shaft body 101 and a housing 102 in which an insertion hole 111 through which the shaft body 101 is inserted is formed. A gap 120 is provided in part of the inner wall portion 111 a of the insertion hole 111 and the peripheral wall portion 101 b in the vicinity of the tip portion 101 a of the shaft body 101. The gap 120 is formed by forming a diameter D11 of a part of the peripheral wall 101b near the tip 101a of the shaft body 101 smaller than the diameter D12 of the insertion hole 111.

  The housing 102 communicates with the gap 120 and introduces a pressure oil 51 that is a fluid into the gap 120 from outside the system, and a discharge path that discharges the pressure oil 51 introduced into the gap 120 out of the system. 113 is formed. The introduction path 112 and the discharge path 113 are formed to extend in the radial direction of the insertion hole 111.

  O-rings 103 and 104 are respectively disposed in recesses 114 and 115 provided in the inner wall portion 111 a of the insertion hole 111. These O-rings 103 and 104 prevent the pressure oil 51 from leaking.

  O-rings 103 and 104 are disposed in the recesses 114 and 115 of the housing 102, the shaft body 101 is disposed at a predetermined position of the insertion hole 111 of the housing 102, and the pressure oil 51 is passed through the introduction path 112, the gap 120, and the discharge path 113. By discharging out of the system, the flow rate of the pressure oil 51 can be adjusted. Here, the size of the gap 120 can be adjusted by changing the diameter D11 of a part of the shaft body 101, and the flow rate of the pressure oil 51 can be easily adjusted.

  Therefore, according to the flow restrictor according to the present embodiment, the above-described configuration makes it easy to adjust the throttle amount with a relatively simple configuration, similar to the flow restrictor according to the first embodiment. Therefore, the size can be reduced.

[Third embodiment]
A third embodiment of the flow restrictor according to the present invention will be described with reference to FIG.
FIG. 9 is an explanatory diagram of the flow restrictor according to the third embodiment of the present invention.

  As shown in FIG. 9, the flow restrictor according to the present embodiment includes a shaft body 201 and a housing 202 in which an insertion hole 211 through which the shaft body 201 is inserted is formed. A diameter D22 of a part of the inner wall portion 211a of the insertion hole 211 is formed larger than the diameter D21 of the shaft body 201, and a gap 220 is formed between the inner wall portion 211a of the insertion hole 211 and the peripheral wall portion 201b of the shaft body 201. Is provided.

  The housing 202 is provided with an introduction path 212, which is a first path having a shape that communicates with the gap 220 and extends in the radial direction of the insertion hole 211, and has a first shape that extends in the extending direction of the insertion hole 211. A discharge path 213 that is two paths is provided. The diameter of the discharge path 213 is the same as the diameter D22 of the large diameter portion 211b of the insertion hole 211.

  A large-diameter portion 201 c that is in sliding contact with the inner wall portion of the large-diameter portion 211 b of the insertion hole 211 is provided at the tip portion 201 a of the shaft body 201 described above. In the vicinity of the tip portion 201a of the shaft body 201, a peripheral wall portion 201b in the vicinity of the tip portion 201a of the shaft body 201 and a hole portion 214 that communicates the tip portion 201a are provided. The hole portion 214 includes a first passage 215 extending in the axial direction of the shaft body 201 from the tip portion 201 of the shaft body 201, and a peripheral wall in communication with the first passage 215 and in the vicinity of the tip portion 201 a of the shaft body 201. And a second passage 216 communicating with the portion 201b.

  O-rings 204 and 205 are disposed in a recess 217 provided in the peripheral wall 201b of the tip 201a of the shaft body 201 and in a recess 218 provided in the inner wall 211a of the insertion hole 211, respectively. These O-rings 204 and 205 prevent the pressure oil 51 that is a fluid from leaking.

  O-rings 204 and 205 are disposed in the recesses 217 and 218, the shaft body 201 is disposed at a predetermined position of the insertion hole 211 of the housing 202, and the pressure oil 51 is introduced into the introduction path 212, the gap 220, the second passage 216, and the first. By discharging out of the system through the passage 215 and the discharge path 213, the flow rate of the pressure oil 51 can be adjusted.

  The shaft body 201 can be fixed to one side 202 a of the housing 202 by a fixing tool (fixing means) 203. Thereby, the magnitude | size of the clearance gap 220 can be adjusted by fixing the shaft body 201 in the predetermined position of the direction shown by A in a figure. Thereby, the flow volume of the pressure oil 51 can be adjusted easily.

  Therefore, according to the flow restrictor according to the present embodiment, the above-described configuration makes it possible to reduce the amount of restriction with a relatively simple configuration, similar to the flow restrictors according to the first and second embodiments. Can be easily adjusted, and downsizing can be achieved.

  According to the flow restrictor according to the present invention, it is easy to adjust the throttle amount with a relatively simple configuration, the size can be reduced, and the flow restrictor can be applied to a device that adjusts the flow rate of fluid. It can be beneficially used in the adjustment equipment industry.

41 Slider 42 Housing 44 Hydraulic cylinder 45 Piston rod 47 O-ring 51 Hydraulic pressure 70 Hydraulic passage 71 Introduction part 72 Distribution part 73 Connection part 81 First discharge part 82 Second discharge part 83 Third discharge part 90 Hydraulic throttle device 91 Shaft body 101 Shaft body 102 Housing 103, 104 O-ring 111 Insertion hole 112 Introduction path 113 Discharge path 114, 115 Recess 120 Clearance 201 Shaft body 202 Housing 204, 205 O-ring 211 Insertion hole 212 Introduction path 213 Discharge path 214 Hole 215 First Passage 216 Second passage 217, 218 Recess

Claims (5)

A shaft,
A housing having an insertion hole through which the shaft is inserted;
While providing a gap in a part of the inner wall portion of the insertion hole and the peripheral wall portion of the shaft body,
The flow rate of the fluid is adjusted by providing the housing with an introduction path communicating with the gap and introducing a fluid into the gap and a discharge path for discharging the fluid introduced into the gap out of the system. Characteristic flow restrictor. The flow restrictor according to claim 1,
The flow restrictor according to claim 1, wherein the introduction path and the discharge path have a shape extending in an extending direction of the insertion hole. The flow restrictor according to claim 1,
The flow restrictor according to claim 1, wherein the introduction path and the discharge path have a shape extending in a radial direction of the insertion hole. A shaft,
A housing having an insertion hole through which the shaft is inserted;
Forming a part of the insertion hole larger in diameter than the shaft body and providing a gap between the inner wall portion of the insertion hole and the peripheral wall portion of the shaft body;
A first path having a shape communicating with the gap and extending in the radial direction of the insertion hole is provided in the housing, and a second path having a shape extending in the extending direction of the insertion hole is provided in the housing.
The shaft body is provided with a large-diameter portion that is in sliding contact with the inner wall portion of the large-diameter portion of the insertion hole, and a hole portion that communicates the gap and the second path is provided in the shaft body.
A flow restrictor comprising a fluid flowing through the first path, the gap, the hole, and the second path to adjust a flow rate thereof. A flow restrictor according to claim 4, wherein
The flow restrictor further comprising fixing means for fixing the shaft body to the housing.

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