JP3871059B2 - Brake device for fluid pressure cylinder - Google Patents

Description

  The present invention relates to a brake device for stopping a moving rod such as a piston rod moved by a fluid pressure (including a lock) in a fluid pressure cylinder.

  As prior arts in this field, there are those described in Patent Document 1 (Japanese Patent Publication No. 57-43762) and Patent Document 2 (Japanese Patent Laid-Open No. 2000-97209).

  In the lock device described in Patent Document 1, a lock piston is urged by a coil spring to be slidably fitted in a lock cylinder directly connected to the fluid pressure cylinder, and the piston rod of the fluid pressure cylinder is penetrated. A lock shoe is installed, a plurality of balls are arranged in an annular shape on the outer periphery thereof, and a tightening body having a conical inner peripheral surface that encloses these balls is provided integrally with the lock piston. When the fluid pressure to the lock piston is discharged, the tightening body presses the lock shoe through the ball by the biasing force of the coil spring, and the piston rod is locked. On the other hand, when the lock piston is slid against the coil spring by fluid pressure, the tightening body releases the pressure on the lock shoe, and the movement of the piston rod is allowed.

  The brake device described in Patent Document 2 is connected to a pair of brake shoes that pass through the piston rod of a fluid pressure cylinder, a pair of U-shaped brake shoe housings that hold the brake shoes contained therein, and the brake shoe housings. A pair of frame-shaped toggle levers pivotally supported by the brake device main body, two sets of torsion coil springs each hung on the toggle levers so as to impart rotational forces in opposite directions to each other, and a pair of brakes A pair of release pistons fitted in the brake device main body with a piston rod penetrating between the shoe housings is provided. When the fluid pressure to the pair of release pistons is released, the pair of toggle levers moves the pair of brake shoe housings by the rotational force of the torsion coil spring, so that the pair of brake shoes is pressed against the piston rod. The piston rod is stopped by the friction force. On the other hand, when the pair of release pistons are slid in opposite directions by the fluid pressure, the release pistons move the pair of brake shoe housings against the spring force of the pair of torsion coil springs. The pressure on the piston rod is released and the movement of the piston rod is allowed.

  However, in the lock device of Patent Document 1, a plurality of balls are annularly arranged between the conical inner peripheral surface of the tightening body that moves integrally with the lock piston and the outer peripheral surface of the lock shoe, and the lock shoe is inserted via the balls. Since it is pressed against the piston rod, the pressing force is partial, and the entire inner peripheral surface of the lock shoe cannot be pressed uniformly against the piston rod. Further, at that time, since the lock piston that moves integrally with the tightening body is urged by the coil spring to obtain the pressing force, there is a problem that the lock device becomes longer in the axial direction as a whole.

Further, in the brake device of Patent Document 2, a frame-shaped toggle lever is pivotally supported in the main body, and a pair of brake shoe housings each holding and holding a pair of brake shoes is coupled to each of the toggle levers. Because of the complicated structure in which two torsion coil springs are hung on each other, the overall thickness of the apparatus becomes large, and manufacturing and assembly are very troublesome.
Japanese Patent Publication No.57-43762 JP 2000-97209 A

  An object of the present invention is to be able to uniformly and uniformly press a moving rod with a brake shoe, to easily adjust the pressing force, and to reduce the length and thickness of the entire device. It is an object of the present invention to provide a brake device for a hydraulic cylinder.

  The brake device of the present invention includes a first and a second pair of fastening members that fasten a pair of brake shoes and press-contact with a moving rod, and a first and a second pair of levers pivotally supported by these fastening members, respectively. And a disc spring that urges the levers to rotate in one direction, and a brake release piston that slides forward and backward with respect to the pair of levers on the opposite side of the disc spring. The second lever is displaced in the tightening direction by applying a rotational force with the pivot point on the first tightening member as a fulcrum, and the second lever moves the pivot point on the second tightening member by the disc spring. The first clamping member is displaced in the tightening direction by applying a rotational force as a fulcrum, and the brake release piston rotates the pair of levers in the direction opposite to the disc spring by the fluid pressure to tighten the pair. And cancels the pull-up by member.

As its specific form, the following configuration is preferable.
A plurality of disc springs are stacked to bias the first and second pair of levers in the same direction. If it does in this way, the clamping force by a pair of clamping members can be set arbitrarily by the number of piled springs or / and direction.

  The first and second pair of fastening members are combined into a cylindrical shape, and the first and second pair of levers are plate-shaped bent so as to surround the outer periphery of the pair of cylindrical fastening members. It is pivotally supported by the respective fastening members in symmetrical directions, and the fastening member on the opposite side is displaced in the fastening direction by engaging with the projections provided on the opposite side. In this way, the device can be further miniaturized.

  Between the pair of brake shoes and the pair of tightening members, a first and second pair of pressing members having a split structure are interposed, and the pair of tightening members are tightened by the pair of tightening members via these pressing members. . In this way, the brake shoe can be protected by the pressing member.

  The first and second pair of brake shoes and the first and second pair of pressing members are held by a ring-shaped retainer that penetrates the moving rod so as to face each other with the moving rod interposed therebetween. Built in. In this way, assembly / disassembly is facilitated.

  According to the present invention, a lever is pivotally supported by a pair of fastening members that fasten a pair of brake shoes, and a disc spring is disposed on one side and a brake release piston is disposed on the other side with the lever interposed therebetween. The pair of tightening members are displaced in the tightening direction by the biasing force to the lever, and the pair of levers are rotated in the opposite direction to the disc spring by the brake release piston to release the tightening by the pair of tightening members. The brake shoe can be pressed uniformly against the moving rod in a stable state, and the pressing force can be easily adjusted with a disc spring, and the overall length and thickness of the device can be reduced. it can.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in the plan view of FIG. 1 and the cross-sectional view of FIG. 3, the brake device A of the present embodiment incorporates all the components in the main body housing 1 and is independent of the pneumatic cylinder B to be stopped. The device is used by being attached to the rod side cover 3 so as to penetrate the piston rod 2 of the pneumatic cylinder B, and stops the movement of the piston rod 2 as described later. The outer shape of the main housing 1 is rectangular as shown in the front view of FIG. 2 and the cross-sectional view of FIG.

  FIG. 5 is an exploded perspective view of a part built in the main body housing 1. The part includes a first and a second pair of brake shoes 4 a and 4 b having a split structure, and a first and a second pair having a split structure. A pair of pressing members 5a and 5b, a first and second pair of retainers 6a and 6b, a first and second pair of clamping members 7a and 7b having a split structure, and a first and second pair of levers 8a and 8b, a first and second pair of pivot pins 9a and 9b, a first and second pair of lever engaging pins 10a and 10b, a plurality of disc springs 11 shown in FIG. 7, and a 1 shown in FIG. There are one brake release piston 12.

  The pair of brake shoes 4a and 4b, the pair of pressing members 5a and 5b, the pair of tightening members 7a and 7b, and the pair of levers 8a and 8b use the same molded product in a symmetrical direction.

  The pair of brake shoes 4 a and 4 b are arc plates that are long in the axial direction of the piston rod 2, and the inner peripheral surfaces thereof are arc surfaces that are in close contact with the outer peripheral surface of the piston rod 2. At both ends of the inner peripheral surfaces of the brake shoes 4a and 4b, step portions 13 having a narrow inner diameter are formed.

  The pair of pressing members 5a and 5b are also arc plates having the same length as the brake shoes 4a and 4b, but the inner diameter thereof is larger than that, and the inner peripheral surfaces of the pressing members 5a and 5b are the outer peripheral surfaces of the brake shoes 4a and 4b. The arc surface is in close contact with the surface. There are no stepped portions on both ends of the inner peripheral surfaces of the pressing members 5a and 5b.

  The pair of retainers 6a and 6b is formed in a ring shape with an elastic material such as rubber, and has a flange portion 14 protruding therefrom.

  When the pair of fastening members 7a and 7b are combined with each other, as shown in FIG. 5, the inner periphery is a circular cylinder and the outer periphery is a hexagonal cylindrical shape. Each arcuate concave surface 15 has an outer diameter of the pressing members 5a and 5b. The inner diameter is adapted to As shown in FIG. 6, convex portions 16 and 17 are integrally formed on each of the fastening members 7 a and 7 b at two corner portions that are diagonally positioned at both ends of the circular arc concave surface 15. 17 are provided with pin receiving holes 18 and 19, respectively.

  The pair of levers 8a and 8b are curved L-shaped plates, and are provided with a shaft hole 21 at a base end portion where a notch recess 20 is formed, and pressure receiving protrusions 22 protruding from both sides of the tip.

  The pivot pins 9a and 9b and the lever engaging pins 10a and 10b are used for different purposes, but substantially the same four pins are used properly. A plurality of steps are formed.

  The disc spring 11 is formed by curving a ring-shaped plate material in the thickness direction to have a spring property. A plurality of disc springs 11 are used as shown in FIG. 8, and the overall spring pressure can be adjusted by changing the number of the discs and the direction of the discs.

  As shown in FIG. 9, the brake release piston 12 is also ring-shaped, and the inner and outer packings 23 and 24 are held in the inner and outer packing grooves.

  The pair of brake shoes 4a and 4b, the pair of pressing members 5a and 5b, and the pair of retainers 6a and 6b are assembled in the main body housing 1 as follows.

  The main body housing 1 is configured by combining a front housing 1a having an air release hole 25 and a rear housing 1b having a brake releasing fluid pressure (pneumatic pressure) supply / discharge port 26. The front and rear housings 1a and 1b have cylindrical inner cylindrical portions 1c and 1d, respectively, but both inner cylindrical portions 1c and 1d are not continuous but are separated from each other in the center of the main body housing 1. The pair of retainers 6a and 6b are disposed in the inner cylindrical portions 1c and 1d, respectively, and the pair of brake shoes 4a and 4b are opposed to each other between the retainers 6a and 6b, and the step portion 13 is disposed. The retainers 6a and 6b are held so that a gap is formed between the retainers 6a and 6b, and a pair of pressing members 5a and 5b are brought into close contact with the outer peripheral surfaces of the brake shoes 4a and 4b, respectively. The members 5a and 5b are held between the retainers 6a and 6b on both sides in a vertically opposed state. Therefore, the pair of brake shoes 4a and 4b and the pair of pressing members 5a and 5b have a length extending over both the inner cylinder portions 1c and 1d.

  The pair of fastening members 7a and 7b, the pair of levers 8a and 8b, the pair of pin pivot pins 9a and 9b, and the pair of lever engaging pins 10a and 10b are assembled in the main body housing 1 as follows. It has been.

  The pair of fastening members 7a and 7b are arranged in a vertically symmetrical direction so that the convex portions 16 and 17 mesh with each other where there is no convex portion on the other side, and both form a cylindrical shape whose inner periphery is circular and whose outer periphery is hexagonal. . The length of the cylinder is shorter than that of a double cylinder formed by a combination of a pair of brake shoes 4a and 4b and a pair of pressing members 5a and 5b.

  The first lever 8a has the shaft hole 21 aligned with the pin receiving hole 18 of the convex portion 16 of the first fastening member 7a, and the pivot pin 9a is inserted into these holes, thereby It is pivotally supported by the fastening member 7a. On the other hand, the second lever 8b has a vertically symmetrical orientation with respect to the first lever 8a so that the shaft hole 21 coincides with the pin receiving hole 18 of the convex portion 16 of the second fastening member 7b, By inserting the pivot pin 9b, the pivot pin is pivotally supported by the second fastening member 7b.

  The lever engaging pins 10a and 10b are inserted into the pin receiving holes 19 of the convex portion 17 of the first fastening member 7a and the pin receiving holes 19 of the convex portion 17 of the second fastening member 7b, respectively. As shown in FIG. 3, the pin 10a on the member 7a side is a protrusion that engages with the notch recess 20 of the second lever 8b, and the pin 10b on the second tightening member 7b side is a notch of the first lever 8a. The protrusion engages with the recess 20.

  The assembly in such a combination is installed between the inner cylinder portions 1c and 1d at the outer periphery of the double cylinder formed by the combination of the pair of brake shoes 4a and 4b and the pair of pressing members 5a and 5b. As shown in FIG. 4, the pair of levers 8a and 8b surround the outer periphery of the pair of fastening members 7a and 7b that form a cylindrical shape along the circular inner peripheral surface of the main body housing 1. ing. As described above, the double cylindrical length of the combination of the pair of brake shoes 4a and 4b and the pair of pressing members 5a and 5b is longer than the cylindrical length of the pair of fastening members 7a and 7b. Projects from both sides.

  A plurality of disc springs 11 are installed on the outer periphery of the inner cylindrical portion 1c in the front housing 1a and press the pressure receiving convex portion 22 on one side of the pair of levers 8a and 8b, while the brake release piston 12 Is slidably fitted on the outer periphery of the inner cylindrical portion 1d in the rear housing 1b and presses the pressure receiving convex portion 22 on the opposite side of the pair of levers 8a and 8b.

  For the brake device A configured as described above, the piston rod 2 of the pneumatic cylinder B passes through a double cylindrical shape formed by a combination of a pair of brake shoes 4a and 4b and a pair of pressing members 5a and 5b. It protrudes outward from the boss 27 of the front housing 1a. The pair of brake shoes 4a and 4b and the pair of pressing members 5a and 5b have a double cylindrical shape that penetrates the piston rod 2, but the cross section is not a continuous circle, as shown in FIG. A gap such as a slit is formed on both sides of the piston rod 2 so as to be separated vertically, and a part of the piston rod 2 is sandwiched from above and below.

Next, the operation of the brake device A will be described.
When air pressure is not supplied from the port 26, the pair of levers 8a and 8b are simultaneously subjected to the rotational force in the same direction by the spring force of the stacked disc springs 11, and the first lever 8a is mounted on the first fastening member 7a. While the pivot pin 9a, which is the pivot point, is pivoted about the pivot point and the lever engaging pin 10b, which is the protrusion of the second fastening member 8b, is pushed upward, the second lever 8b is The pivot pin 9b, which is a pivot point on the second tightening member 7b, is rotated about the pivot point, and the lever engaging pin 10a, which is a protrusion of the first tightening member 8a, is pushed downward. As a result, the first clamping member 7a receives pressure in the central direction simultaneously by the second lever 8b and the second clamping member 7b by the first lever 8a, and passes through the pair of pressing members 5a and 5b. The pair of brake shoes 4a and 4b are tightened simultaneously. As a result, the pair of brake shoes 4a and 4b are pressed against the piston rod 2 and stopped (or locked) by the frictional force.

  On the other hand, when air pressure is supplied from the port 26, the brake release piston 12 is propelled to rotate the pair of levers 8a and 8b against the disc spring 11, so that the first and second tightening members 7a and 7b are tightened. Is released, and the movement of the piston rod 2 is allowed.

  In the above embodiment, the application example in which the movement of the piston rod 2 of the pneumatic cylinder B is stopped has been described. However, when the brake device according to the present invention stops a rod that moves with a fluid pressure other than the piston rod 2, the pneumatic cylinder It can be applied to other fluid pressure cylinders (such as hydraulic cylinders).

It is the top view which notched a part of brake device which is one Example of this invention. It is a front view of the brake device. It is sectional drawing of an axial direction similarly. It is sectional drawing of the XX line position in FIG. It is a disassembled perspective view of a built-in component. It is a perspective view of a pair of fastening members. It is a perspective view of a disc spring. It is sectional drawing of the state which the disc spring piled up. It is sectional drawing of a brake release piston.

Explanation of symbols

A Brake device B Pneumatic cylinder 1 Body housing 1a, 1b Front and rear housings 1c, 1d Inner cylinder part 2 Piston rod 3 Rod side cover 4a, 4b Brake shoe 5a, 5b Holding member 6a, 6b Retainer 7a, 7b Tightening member 8a, 8b Lever 9a / 9b Pivoting pin 10a / 10b Lever engaging pin 11 Belleville spring 12 Brake release piston 13 Step part 14 Ridge part 15 Arc concave surface 16/17 Projection part 18/19 Pin receiving hole 20 Notch concave part 21 Shaft hole 22 Pressure receiving Convex part 23/24 Packing 25 Air release hole 26 Supply / exhaust port 27 Boss

Claims (5)

  In a brake device for a hydraulic cylinder in which a first and second pair of brake shoes having a split structure are simultaneously brought into pressure contact with a moving rod moved by fluid pressure, and the rod is stopped by a frictional force, the pair of brake shoes is A first and second pair of tightening members that are tightened and pressed against the moving rod, a first and second pair of levers pivotally supported by the respective tightening members, and the levers are urged to rotate in one direction. A disc spring and a brake release piston that slides forward and backward with respect to a pair of levers on the opposite side of the disc spring are provided. The first lever has a pivot point on the first fastening member as a fulcrum by the disc spring. The second tightening member is displaced in the tightening direction by being given a turning force to rotate, and the second lever is rotated by a disc spring with the pivot point on the second tightening member as a fulcrum. The force is applied to displace the first fastening member in the fastening direction, and the brake release piston releases the fastening by the pair of fastening members by rotating the pair of levers in the direction opposite to the disc spring by the fluid pressure. A brake device for a fluid pressure cylinder.   2. The brake device for a hydraulic cylinder according to claim 1, wherein the disc springs overlap each other and bias the first and second pair of levers in the same direction.   The first and second pair of fastening members are combined into a cylindrical shape, and the first and second pair of levers are plate-shaped bent so as to surround the outer periphery of the pair of cylindrical fastening members. 3. The device according to claim 1, wherein the clamp member is pivotally supported by the respective clamp members in a symmetric direction, and the clamp member on the opposite side is displaced in the tightening direction by engaging with a protrusion projecting from the clamp member. Brake device for hydraulic cylinders.   Between the pair of brake shoes and the pair of tightening members, a first and second pair of pressing members having a split structure are interposed, and the pair of tightening members are tightened by the pair of tightening members via these pressing members. The brake device for a fluid pressure cylinder according to claim 1, 2, or 3.   The first and second pair of brake shoes and the first and second pair of pressing members are held by a ring-shaped retainer that penetrates the moving rod so as to face each other with the moving rod interposed therebetween. The brake device for a fluid pressure cylinder according to claim 4, wherein the brake device is built-in.

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