JPH058036U - Brake unit for linear guide device and linear guide device including the same - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a brake unit of a linear guide device which can be installed together with a linear guide device and can firmly hold a table attached to a slider at a predetermined position as needed. [Structure] A cylinder bore 30 is provided in a housing 31 formed so as to be capable of straddling the guide rail 1 of a linear guide device, and a piston 37 having an engaging projection 40 at the tip thereof for engaging the rolling element rolling groove 3 on the side surface of the guide rail. And a return spring 41 for urging the piston to the retracted position and a pressurizing chamber 47 for pressurizing the piston toward the side surface of the guide rail. The guide rail is held by the piston.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  In this invention, a table device such as a lathe using a linear guide device is used for cutting. It moves by its reaction force during construction, and the table is supported downward by a linear guide device. When using, the slider of the linear guide device may come off the guide rail Brake unit for the linear guide device to prevent falling And a linear guide device including the same.

[0002]

[Prior art]

  The linear guide device includes a guide rail having axial rolling element rolling grooves on both side surfaces, The slider is mounted on the guide rail. Slider is a guide rail Both rolling elements that have rolling element rolling grooves facing the rolling element rolling grooves of the Through the rolling of a large number of rolling elements (balls or rollers) fitted in the body rolling groove, It is movable in the axial direction of the inner rail. Applications of such linear guide devices Conventionally, for example, a linear motion guide table device as shown in FIG. Cable device) is known. It has ball rolling grooves 3 on both sides Two linear guides, each of which has two sliders 2 mounted on a guide rail 1. The guide device 1 is arranged in parallel, the guide rail 1 is fixed to the machine base, and the table T is set to 4 The table T is supported by the individual sliders 2, and the table T is moved by the ball screw device B. It is built. The ball screw shaft 4 of the ball screw device B is screwed through a large number of balls. The fitted nut 5 is connected to the table T and is supported by a frame body (not shown). The ball screw shaft 4 is rotated by a servomotor connected through a coupling. As a result, the table T is moved in the axial direction while being guided by the linear guide device LG. Move to position in place. For example, a tool post of a machine tool is mounted on the table T. Once worn, accurate machining of the work piece can be done.

[0003]

[Problems to be solved by the device]

  However, in the above conventional table device, the table T is held at a predetermined position. The holding force for doing so depends exclusively on the rigidity of the ball screw device B. However However, as the rigidity of the ball screw device B, the torsion of the ball screw shaft 4 and the nut 5 is Rigidity, torsional rigidity of the coupling interposed between the ball screw shaft 4 and the motor, Many factors are involved, such as the servo lock stiffness of the All the factors are crushed and the table T is resisted against the reaction force applied to the tool post during cutting, for example. There is a problem in that it is difficult to completely hold the in position.

[0004]   Also, in the overhead traveling device, the top and bottom of the linear guide device LG are reversed and installed on the ceiling. Attach the table T downward to the slider 2 and hang it to support it. If the end cap is damaged due to a collision, etc. The balls interposed between the rail 1 and the slider 2 do not fall out from the ball rolling groove 3. There is a problem that the table T may drop if a loose ball drop occurs. there were.

[0005]   Therefore, this invention was made by paying attention to the above-mentioned conventional problems. Can be installed side-by-side with the device, and the table attached to the slider can be firmly fixed in place if necessary. Providing a brake unit for a linear guide device that can be held at The purpose is to solve.

[0006]

[Means for Solving the Problems]

  The brake unit of the present invention, which achieves the above object, is a linear guide device. On the sleeve part of the housing with a U-shaped cross section that can be hung over the inner rail, There is a cylinder bore to cut, and inside the cylinder bore, the side of the guide rail at the tip Of the piston, which has a projection for engaging the rolling element rolling groove of the The return spring that urges the stone to the retracted position, and the piston against the urging force of the return spring. And a pressure chamber to which a pressurized fluid that pressurizes the engine toward the side surface of the guide rail is supplied. And a fluid path to the pressurizing chamber is provided in the housing. To do.

[0007]   The brake unit is extended with axial rolling element rolling grooves on both sides. The guide rail and the guide rail are loosely fitted in the guide rail so as to be movable in the axial direction. Rolling element rolling grooves that oppose the rolling element rolling grooves of the With a slider that can move in the axial direction through the rolling of many balls in the groove Mounted on the guide rail of the linear guide device so that it can move in the axial direction. You can

[0008]

[Action]

  The brake unit uses the engaging projection on the piston tip to roll the guide rail rolling element. Engages in the groove so that it can move axially on the guide rail and fall off the guide rail. It is mounted impossible.   During braking, it is possible to supply pressurized fluid from outside via a fluid path to the pressurized chamber. As a result, the engaging projection is pressed against the groove surface of the rolling element rolling groove of the guide rail, The brake unit and the guide rail are integrated with high rigidity.

[0009]

【Example】

  An embodiment of the present invention will be described below with reference to the drawings. In addition, it is the same as before or Corresponding parts are designated by the same reference numerals. 1 to 10 show one embodiment of the present invention. As an example, FIG. 1 is a front view showing a cross section of the left half of the brake unit, and FIG. 2 is a brake. A side view of the unit, FIG. 3 is an end view of the housing body of the brake unit, and FIG. Front view of piston, Fig. 5 is front view of end cap, and Fig. 6 is front view of side seal. Fig. 7 is a perspective view of the brake unit mounted on the guide rail. Fig. 8 is a linear guide. 1 is a plan view showing a main portion of the drive device in a cutaway manner, FIG. 9 is a perspective view of a linear guide device, and FIG. 0 is a table device schematically showing an example of use of a linear guide device with a brake unit It is a principal part perspective view of an installation.

[0010]   In FIGS. 1 and 2, reference numeral 30 denotes a brake unit, which is a cross-sectional member that straddles the guide rail 1. The housing body 31 formed in a U-shape has a U-shape on both end faces 31a in the longitudinal direction. -Shaped end cap 32 has a U-shaped side seal 33 on the outer side. They are piled up and attached with a common bolt b1. The upper surface of the housing body 31 Four screw holes 31c for table mounting bolts are formed in 31b.

[0011]   On both sleeves 34 of the U-shaped housing body 31, the side surface 34a of the sleeve 34 is opened. Along with the mouth, it penetrates through the sleeve 34 and opens on the inner wall surface 34b of the central recess. The two cylinder bores 35 are formed in parallel on each sleeve. This The Linda bore 35 has a stepped portion 36 having a different diameter in the middle thereof. On the boundary, the side surface 34a side of the sleeve portion 34 has a large diameter guide surface 35a, and the wall surface 34b side of the recess is more The guide surface 35b has a small diameter.

[0012]   A piston 37 is slidably fitted in the cylinder bore 35. This The piston 37 is a disk-shaped piston fitted to the large diameter guide surface 35a of the cylinder bore. Ton body 37a and the small diameter of the cylinder bore extending from this piston body 37a And a piston rod portion 37b fitted to the guide surface 35b of the An O-ring groove 37c is formed on a side surface of the body portion 37a, and an O-ring 38 is attached to the body portion 37a. There is. In addition, the piston rod portion 37b has an engaging protrusion 40 in two upper and lower stages at the tip thereof. , The engaging protrusions 40 are respectively formed on the rolling element rolling grooves 3 in the upper and lower two steps on the side surface of the guide rail 1. It is formed in a shape that can be engaged.

[0013]   The piston 37 is pulled from the guide rail 1 to the step portion 36 of the cylinder bore 35. As the return spring 41 for urging in the releasing direction, for example, a disc spring is attached and The main body 37a is being suppressed. Further, a groove for a snap ring is formed on the inner wall surface of the cylinder bore 35. 42 is formed, and the return spring 41 and the piston 37 are formed in the cylinder bore 35. After inserting the stopper ring 43 into the groove 42, the piston 37 Regulates the retreat limit of. When the piston 37 is retracted to the retracted position, The engagement projection 40 at the tip of the piston rod portion 37b is formed in the rolling element rolling groove of the guide rail 1. 3 as long as the engaging projection 40 is completely separated from the rolling element rolling groove 3. The mounting position of the retaining ring 43 is set so as not to cause it.

[0014]   The opening on the side surface 34 a side of the sleeve portion of the cylinder bore 35 is covered with a lid body 44. This The lid body 44 of the above is provided with a seal member 46 in a recess formed by partially cutting the side surface 34a of the sleeve portion. It is then fitted and fixed to the side surface 34a of the sleeve with a screw b2. Thus, An empty space is formed in the cylinder bore 35 between the retaining ring 43 and the lid body 44. The vacant chamber moves the piston 37 toward the side surface of the guide rail 1 against the biasing force of the return spring 41. The pressurizing chamber 47 is supplied with a pressurizing fluid for pressurizing. And this pressurization As the path 48 of the pressurized fluid supplied to the chamber 47, both end surfaces 3 of the housing main body 31 1a and 31a are formed with U-shaped grooves 48a along the end face shape, respectively. One groove end communicates with the pressurizing chamber 47 of the cylinder bore 35 of the one sleeve portion 34, and the other groove end The groove end communicates with the pressurizing chamber 47 of the cylinder bore 35 of the sleeve 34 on the opposite side. U-shape A distribution recess 48b is formed in the middle of the groove 48a. Like this At the end surface of the housing main body 31 having the V-shaped groove 48a, the end cap 32 is rolled. The end cap 32 is screwed into a position corresponding to the recess 48b. 50 has a oil nipple 49 screwed thereto, and a pressure source (not shown) Fluid path 48 is formed. In this embodiment, a plurality of sleeves 34 are provided. Each of the pressurizing chambers 47 of the cylinder bores 35 (four) provided in the fluid path 48 There is one oil nipple 49 that is connected to each other and therefore connects to the pressure source. Just enough.

[0015]   The side seal 33, which is mounted over the end cap 32, has an oil Separately from the insertion hole 33a of the pluck 49 and the spot facing hole 33b for the mounting bolt b1, the sleeve portion A seal projection 52 is provided inside the rail so as to be slidably contactable with the rolling element rolling groove 3 of the guide rail 1. Has been.   As shown in FIG. 7, the brake unit 30 formed as described above is It is mounted while straddling the guide rail 1 of the near guide device. In that case, the piston lock The engaging projection 40 at the tip of the guide portion 37b is fitted into the groove of the rolling element rolling groove 3 of the guide rail 1. To do. However, when the brake is released, the tip of the engaging projection 40 and the groove surface of the rolling element rolling groove 3 are There is a slight gap between them and they are separated.

[0016]   The slider 2 of the linear guide device LG may have a known structure. Those used are shown in FIGS. 8 and 9.   As shown in the figure, the slider 2 having a substantially U-shaped cross section is provided on the guide rail 1. It is loosely fitted so that relative movement is possible. The slider 2 is in the longitudinal direction of the slider body 2A. End caps 8 and side seals 9 are attached to both end faces of the. Su On the inner surface side of both sleeves of the rider body 2A, face the rolling element rolling groove 3 on the side surface of the guide rail 1. Oriented rolling element rolling grooves 5 are formed, and both rolling element rolling grooves 3 and 5 facing each other are formed. A rolling element rolling path (load path) 6 is formed by the groove. Both sleeves of slider body 2A In the wall thickness of the part, a cross-section circle that is axially penetrated in parallel with the ball rolling path 6 A rolling element return passage 7 having a shape is formed.

[0017]   The end caps 8 joined to the front and rear ends of the slider body 2A in the axial direction are combined. It is an injection-molded product made of synthetic resin material, and its entire cross section is roughly U-shaped. On both sleeves , A semi-arcuate bay on the side of the joint end surface 8a that abuts on the end surface of the slider body 2A. A curved path 10 is formed. The curved path 10 connects the rolling element rolling path 6 and the rolling element return path. A semi-cylindrical column that connects the load path 6 including the path 7 and is located at the center of the curve. It is formed in a half donut shape with a return guide 15 in the shape of a half. And above Endless circulation path formed by the load path 6 of the vehicle, the front and rear curved paths 10 and the rolling element return path 7. A large number of balls B, which are rolling elements, are loaded on the road.

[0018]   The end portion of the curved path 10 of the end cap 8 on the guide rail side is shown in FIG. A ball scooping protrusion 10d is formed to protrude inward in a substantially semicircular shape, The tip of the acute angle can be loosely fitted in the ball rolling groove 3 of the guide rail 1. In the figure, 26 is a screw for fixing the end cap 8 to the slider body 2A, 27 is a guide rail 1 fixed to a base (not shown) when using the linear guide device. An insertion hole for a bolt for fixing the table T to the slider 2 is provided for the bolt. It is a screw hole.

[0019]   In FIG. 10, the brake unit 30 is mounted on the guide rail 1 of the linear guide device LG. The outline of the table device using the linear guide device with a brake unit Show. Two linear guide devices LG with a brake unit are arranged in parallel, and 1 is fixed to the machine base, and 4 sliders 2 and 2 brake units 30 Is fixed to and supported by the table T, and the table T is moved by the ball screw device B. It has a structure that The nut 5 screwed onto the ball screw shaft 4 of the ball screw device B. Is connected to the lower surface of the table T. Although not shown, it is supported by the frame. The ball screw shaft 4 is rotatably driven by a servomotor connected through a coupling. It is supposed to be. The table T can be equipped with a tool rest of a machine tool. . In addition, 55 is a flexible cable connected to the oil nipple 49 of the brake unit 30. It is a sible hydraulic pipe and is connected to the hydraulic pressure supply device via a directional valve (not shown). It

[0020]   Next, the operation of the above embodiment will be described.   In the table device of FIG. 10, the ball screw shaft 4 of the ball screw device B is illustrated. It is driven to rotate in the forward or reverse direction by a servo motor connected via a coupling. Then, the NATTO 5 moves forward or backward depending on the rotation direction of the table T, It moves in the axial direction while being guided by the linear guide device LG. Table T is a predetermined position Servo motor is stopped and the direction of the hydraulic pressure supply device (not shown) is turned off. The valve is operated to supply hydraulic pressure to the pressurizing chamber 47 of the brake unit 30. This oil The pressure pushes the piston 37 against the urging force of the return spring 41, and the engagement protrusion 4 0 is brought into contact with the groove surface of the rolling element rolling groove 3 of the guide rail 1 and strongly pressed, Make you feel good. As a result, the guide rail 1 is strongly pinched from both sides and Fixing the brake unit 30, guide rail 1 and table T together with high rigidity. You can When releasing the brake, press the directional switching valve of the hydraulic pressure supply device to pressurize. When the chamber 47 is released to the atmosphere, the elastic force of the return spring 41 causes the piston 37 to move to the stop ring 43. Retracting to the regulated retracted position, the engagement protrusion 40 at the tip of the rolling element rolling of the guide rail 1 Move away from the groove surface of the groove 3.

[0021]   The holding force of the brake unit 30 is independent of the ball screw device B and the drive system of the motor. Standing up, movement of table T during cutting and table in overhead traveling device Can be completely prevented from falling. In addition, when used for NC machine tools, NC professional It can also function as a safety device against runaway caused by abnormal Gram.   In the above embodiment, the piston 37 is placed opposite the sleeves of the brake unit 30. Although the above description has been made, it is also possible to dispose only on one sleeve part.

[0022]   The rolling element rolling groove 3 of the guide rail 1 may have any number of threads, Then, the engagement protrusion 40 at the tip of the piston rod 37b may be formed.   Also, the pressurized fluid is not necessarily limited to hydraulic pressure.

[0023]

[Effect of device]

  As described above, according to the brake unit for the linear guide device of the present invention, A housing with a U-shaped cross section formed so that it can be straddled over the guide rails of the linear guide device. The sleeve has a protrusion at the tip that engages with the rolling groove of the rolling element on the side of the guide rail. Dispose a piston fitted in there, pressurize this piston during braking, The engaging projection presses the groove surface of the rolling element rolling groove of the guide rail. for that reason, If this linear guide device is equipped with this brake unit, , Because the engaging projection engages with the groove of the guide rail, even if the slider drops The table attached to the linear guide does not fall off, and when braking. To provide a linear guide device that can hold the table with extremely high rigidity The effect that it can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing a left half of a brake unit in section.

FIG. 2 is a side view of a brake unit.

FIG. 3 is an end view of the housing body of the brake unit.

FIG. 4 is a front view of a piston.

FIG. 5 is a front view of an end cap.

FIG. 6 is a front view of a side seal.

FIG. 7 is a perspective view in which a brake unit is attached to a guide rail.

FIG. 8 is a plan view showing a notched part of a linear guide device.

FIG. 9 is a perspective view of a linear guide device.

FIG. 10 is a perspective view of a main part of a table device schematically showing a usage example of a linear guide device with a brake unit.

FIG. 11 is a perspective view of a main part of a conventional table device.

[Explanation of symbols]

1 Guide rail 2 slider 3 Rolling element rolling groove (of guide rail) 30 brake unit 31 Housing body 35 cylinder bore 37 pistons 40 engagement protrusion 41 Return spring 47 Pressurizing chamber 48 fluid path

Claims (2)

[Scope of utility model registration request] 1. A sleeve of a housing having a U-shaped cross section formed so as to be capable of straddling a guide rail of a linear guide device has a cylinder bore that traverses the sleeve, and the guide bore of the guide rail is provided at the tip of the cylinder bore. A piston slidably fitted with an engaging projection to the rolling element rolling groove on the side surface, a return spring for urging the piston to a retracted position, and a urging force of the return spring. A linear guide device, comprising: a pressurization chamber to which a pressurizing fluid that pressurizes the piston toward the side surface of the guide rail is supplied; and a fluid path to the pressurization chamber in the housing. Brake unit. 2. A guide rail extending on both sides with axial rolling element rolling grooves, and a guide rail rollingly mounted on the guide rail so as to be axially movable. A slider that is provided with rolling element rolling grooves that face the grooves and is axially movable via rolling of a large number of balls in both rolling element rolling grooves that face each other; and an axial direction on the guide rail. A linear guide device, comprising: the brake unit according to claim (1) that is movably straddled.