JP2009058025A - Braking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low cost and easily assemblable braking device where a brake shoe is not moved in the direction of the brake drum axis center during braking operation. <P>SOLUTION: The braking device has a pair of electromagnetic brake parts which are built in a cylindrical brake drum 1 rotating around the axis center, and a fixed iron core 8 and a movable iron core 9 composing the electromagnet which are disposed at the opposite positions apart by 180° with the axis center as the center corresponding to the inner peripheral surface of the brake drum 1, the brake shoe 3 pressure-attachable with the inner peripheral surface of the brake drum 1, a press arm 4 which is firmly fixed and vertically provided with the movable iron core to press the side surface of the internal diameter of the brake shoe 3, a frictional material 13 attached to the brake shoe 3, and a housing 2 for fixing the electromagnetic brake part. A pair of projection parts 16 having a torque receiving surface 17 opposing to both end surfaces in the peripheral direction of the brake shoe 3 are provided on the housing, the brake shoe 3 is disposed between the protrusions 16, and mounted to the housing 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brake device used for a hoisting machine or the like.

  In the conventional hoisting machine, a pair of left and right electromagnetic brakes are arranged to face the inner peripheral surface of the brake drum by 180 °. The electromagnetic brake is an internal expansion type brake device built in a brake drum, and includes a stationary iron core and a movable iron core, and a brake shoe is attached to the movable iron core. The brake is released by energizing the coil built in the fixed iron core and sucking the movable iron core.

  Further, the energization to the coil is interrupted to release the suction, and the hoisting machine is braked by pressing the brake shoe against the brake drum with the force of the spring built in the fixed iron core. The spring is inserted and held in a fixing hole provided in the yoke of the fixed iron core. Usually, two springs are inserted at symmetrical positions.

  The brake shoe is provided with a friction material, and the brake shoe and the movable iron core are connected by one or two connecting members. The connecting member and the brake shoe are connected to the brake shoe via a spherical seat. It is comprised so that it may contact elastically with retainers, such as the fixed leaf | plate spring piece (for example, refer patent document 1 and patent document 2).

JP 2002-303341 A (page 3, FIG. 5) JP 2007-2906 A (4th page, FIG. 2)

  Since the brake shoe is displaced in the axial direction of the brake drum during repeated braking and release, in the conventional brake device, the axial center is prevented in order to prevent the brake shoe from moving in the axial direction of the brake drum. It was necessary to provide a pair of misalignment prevention members that sandwich the brake shoe from the direction.

  In addition, the bolt for attaching the retainer such as a leaf spring piece for elastically contacting the brake shoe and the connecting member is fastened in a direction perpendicular to the axis of the brake drum. It was difficult to adjust the retainer by inserting a tool into the brake drum.

  The present invention has been made to solve the above-described problems, and not only does the position shift prevention member become unnecessary, but also makes it unnecessary to adjust a retainer such as a leaf spring piece, and is inexpensive and easy to assemble. The purpose is to obtain a brake device.

A brake device according to the present invention is built in a cylindrical brake drum that rotates about an axis, and is disposed at a position opposite to the center of the shaft by 180 ° corresponding to the inner peripheral surface of the brake drum. A pair of electromagnetic brake parts having a fixed iron core and a movable iron core constituting the electromagnet,
Brake shoes that can be pressed against the inner peripheral surface of the brake drum,
A pressing arm that is fixedly attached to the movable iron core and presses the inner diameter side surface of the brake shoe;
A friction material attached to a surface that presses the inner peripheral surface of the brake drum in the brake shoe;
And an internal expansion brake device having a housing for fixing the electromagnetic brake part,
The housing is provided with a pair of protrusions having torque receiving surfaces facing both end surfaces in the circumferential direction of the brake shoe,
The brake shoe is disposed between the protrusions and attached to the housing.

  According to the brake device of the present invention, since the brake shoe is attached to the housing, the brake shoe can be braked even without the position shift prevention member for preventing the brake shoe from moving in the axial direction of the brake drum. Since the shoe does not move in the direction of the axis of the brake drum, the position shift prevention member can be eliminated, and the cost can be reduced.

  Further, since there is no position shift prevention member, the range of swinging (swinging) of the brake shoe is increased, the swinging is smooth, and the contact performance of the brake shoe against the inner peripheral surface of the brake drum is improved. That is, the friction material of the brake shoe can be uniformly contacted (sliding contact / pressing contact) with the entire inner surface of the brake drum, and the brake drum can be reliably braked.

  In addition, in the electromagnetic brake assembly process, conventionally, the gap between the brake shoe and the brake drum was adjusted after connecting the brake shoe and the pressing arm erected on the movable iron core. In the brake device of the invention, since the brake shoe and the pressing arm come into contact with the adjustment of the clearance between the brake shoe and the brake drum, the connection work becomes unnecessary and the assemblability is improved.

The best mode for carrying out the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a front view showing a first embodiment of a brake device according to the present invention, and shows a partial cross section. As shown in FIG. 1, the brake device according to the first embodiment is built in a cylindrical brake drum 1 that can rotate around a shaft of a hoisting machine or the like, and corresponds to the inner peripheral surface of the brake drum 1. A pair is arranged at positions opposite to 180 °. In other words, as shown in FIG. 1, the pair of electromagnetic brake portions are symmetrical with respect to the central section reference line L passing through the axis O of the brake drum 1 or 180 around the axis O. ° Arranged as rotationally symmetric.

  Each electromagnetic brake unit 7 has a fixed iron core 8 and a movable iron core 9 that constitute an electromagnet, and the movable iron core 9 is in contact with and separated from the fixed iron core 8.

  The fixed iron core 8 is formed with a concave groove into which the rectangular or elliptical electromagnetic coil 5 is fitted, and the electromagnetic coil 5 is fitted into and fixed to the concave groove.

  The movable iron core 9 has a rectangular plate (band plate piece) shape, and is attracted to the fixed iron core 8 when the electromagnetic coil 5 is excited, and separated from the fixed iron core 8 when the electromagnetic coil 5 is in a non-excited state. The spring 14 that constantly urges and urges in the separating direction is housed in a hole 6 provided in the fixed iron core 8. In FIG. 1, each fixed iron core 8 is an integrally formed fixed iron core formed integrally.

  Each electromagnetic brake unit 7 includes a brake shoe 3, and the brake shoe 3 can be pressed against the inner peripheral surface 1a of the brake drum 1 from the radial direction as an internal expansion brake device.

  The brake shoe 3 has a rectangular flat pad portion, and a substantially bowl-shaped friction material (slidable contact / pressure contact) that can freely come into direct contact (sliding contact / pressure contact) with the inner peripheral surface 1a of the brake drum 1 on the radially outer surface of the pad portion. A lining material 13 is attached.

  The fixed iron core 8, the movable iron core 9, and the brake shoe 3 are sequentially arranged from the axial center O of the brake drum 1 toward the inner peripheral surface 1a, and are provided in parallel to the central section reference line L. .

  Further, the housing 2 is integrally provided with a pair of protrusions 16, and the brake shoe 3 is disposed between each pair of protrusions 16.

  The protrusion 16 has a torque receiving surface 17 that receives rotational torque in the circumferential direction of the brake shoe 3, and the brake shoe 3 is arranged such that both end surfaces in the circumferential direction of the brake shoe 3 face the torque receiving surface 17. The receiving surface 17 is in contact with the end surface of the brake shoe 3 in the circumferential direction, and is disposed in a direction orthogonal to the center section reference line L.

  The movable iron core 9 and the brake shoe 3 are in contact with each other via two pressing arms 4. The pressing arm 4 is provided in a direction orthogonal to the central section reference line L (and in the radial direction) and is disposed at both end positions in the circumferential direction of the brake shoe 3, and the base end of the pressing arm 4 is the diameter of the movable iron core 9. It is fixedly erected on the outer surface in the direction.

  Specifically, the pressing arm 4 has a threaded portion that is screwed into a screw hole of the movable iron core 9 so as to be able to advance and retract, and the pressing arm 4 has a lock nut 11 in an unbraking state. A gap adjusting function for adjusting a gap between the friction material 13 and the brake drum inner peripheral surface 1a is provided.

  Furthermore, a flat spherical head 4a is formed at the tip of the pressing arm 4 so that a flat head 4a bulges out, and the tip of the head 4a has a convex spherical shape, and a part of the spherical seat 15 is formed. To do.

  A spherical seat 15 is attached to the inner surface in the radial direction of the brake shoe 3, and a concave spherical portion 15 a with which the tip spherical portion of the head of the pressing arm 4 abuts is provided on the inner surface in the radial direction of the spherical seat 15.

  A joint (spherical seat) capable of swinging the pressing arm 4 is formed by sliding contact between the concave spherical portion 15a and the tip spherical portion 4a.

  Since the brake shoe 3 is attached to the housing 2 by the resilient members 10 disposed at both ends in the circumferential direction, the tip spherical surface portion of each pressing arm 4 is constantly resiliently biased in the pressure contact direction of the spherical seat 15. be able to.

  FIG. 2 shows a specific mounting arrangement. FIG. 2 is a cross-sectional view showing a mounting arrangement of the brake shoe 3 and the like as seen from a cross section taken along line AA shown in FIG. The brake shoe 3 has a leaf spring 18 that is a resilient member fixed with a screw or the like near the circumferential end of the inner diameter side surface, and is attached to the housing 2 via the leaf spring 18. Further, no movement preventing member is provided to sandwich the brake shoe 3 from the vertical direction in FIG.

  When the electromagnetic coil is not excited, that is, when the brake shoe 3 to which the friction material (lining material) 13 is attached is pressed against the brake drum 1 by the elastic force of the spring 14, the leaf spring 18 is moved in the radial direction. Since the bending deformation is performed and the torsional deformation is performed following the minute deflection generated in the brake drum 1, the contact pressure between the friction material 13 and the brake drum 3 can be made uniform easily.

  Further, the translational movement of the brake shoe 3 in the axial direction (vertical direction in FIG. 2) of the brake drum is constrained by a leaf spring 18 having high in-plane rigidity (having rigidity in the axial direction of the brake drum 1). Therefore, even if there is no movement prevention member, the brake shoe 3 does not translate.

  Further, as shown in FIG. 2, the attachment of the leaf spring 18 on the housing 2 side is performed through a long hole 18a provided in the leaf spring 18, so that the brake shoe 3 is attached to the torque receiving surfaces 17 at both ends in the circumferential direction. The gap can be slid in the radial direction, and the brake shoe 3 that has received the rotational torque from the brake drum 1 can smoothly move through the slight gap until it hits the torque receiving surface 17.

  As described above, according to the first embodiment, the brake shoe 3 can operate smoothly regardless of the swing of the operation of the movable iron core 9 caused by the excitation / de-excitation of the electromagnetic coil 5.

  Of course, the same effect can be obtained even when the leaf spring 18 is fixed to the housing 2 and the leaf spring 18 and the brake shoe 3 are attached through the elongated hole 18a of the leaf spring 18.

Embodiment 2. FIG.
FIG. 3 is a front view showing a second embodiment of the brake device according to the present invention, and shows a partial cross section. In the first embodiment, the movable iron core 9 and the brake shoe 3 are in contact with each other via the two pressing arms 4. In the second embodiment, as shown in FIG. 3, the movable iron core 9 and the brake shoe 3 are in contact with each other via one pressing arm 4.

  According to the second embodiment, the gap between the inner peripheral surface 1a of the brake drum and the brake shoe 3 (the friction material 13 thereof) can be easily adjusted minutely and at equal intervals by the single pressing arm 4. Can greatly reduce the time and effort required to improve productivity. Further, since the number of parts is reduced, the cost can be reduced.

Embodiment 3 FIG.
FIG. 4 is a front view showing a third embodiment of the brake device according to the present invention, and shows a partial cross section. In the first embodiment and the second embodiment, the tip of the pressing arm 4 fixedly erected on the movable iron core 9 is in contact with the brake shoe 3 via the spherical seat 15.

  In the third embodiment, as shown in FIG. 4, the portion corresponding to the spherical seat 15 is formed by the concave portion 15 b provided on the inner diameter side surface of the brake shoe 3, so that the first embodiment and the second embodiment are performed. In addition, the productivity can be improved and the number of parts can be reduced, so that the cost can be reduced.

  The brake device of the present invention can be effectively used for a hoist used for an elevator or the like.

1 is a front view showing Embodiment 1 of a brake device according to the present invention. It is sectional drawing which shows the mounting arrangement | positioning of the brake shoe 3 etc. seen from the cross section in the AA line shown in FIG. It is a front view which shows Embodiment 2 of the brake device which concerns on this invention. It is a front view which shows Embodiment 3 of the brake device which concerns on this invention.

Explanation of symbols

1 Brake drum, 1a Inner peripheral surface, 2 Housing, 3 Brake shoe,
4 Pressing arm, 4a Flat head, 5 Electromagnetic coil, 6 holes, 7 Electromagnetic brake, 8 Fixed iron core, 9 Movable iron core, 10 Elastic member, 11 Lock nut,
12 fixing bolt, 13 friction material (lining material), 14 spring, 15 spherical seat,
15a concave spherical surface portion, 15b concave portion, 16 projection portion, 17 torque receiving surface, 18 leaf spring,
18a oblong hole, O brake drum axial direction, L center section reference line.

Claims (6)

A fixed iron core constituting an electromagnet, which is built in a cylindrical brake drum that rotates about an axis, and is disposed at a position opposite to the center of the axis by 180 ° corresponding to the inner peripheral surface of the brake drum; A pair of electromagnetic brake parts having a movable iron core,
Brake shoes that can be pressed against the inner peripheral surface of the brake drum,
A pressing arm that is fixedly attached to the movable iron core and presses the inner diameter side surface of the brake shoe;
A friction material attached to a surface that presses the inner peripheral surface of the brake drum in the brake shoe;
And an internal expansion brake device having a housing for fixing the electromagnetic brake part,
The housing is provided with a pair of protrusions having torque receiving surfaces facing both end surfaces in the circumferential direction of the brake shoe,
A brake device, wherein the brake shoe is disposed between the protrusions and attached to the housing. At both ends of the brake shoe, the inner side surface of the brake shoe is always elastically biased in the direction of pressure contact of the pressing arm, and a resilient elastic member having rigidity in the axial direction of the brake drum is attached. The brake device according to claim 1, wherein the brake shoe is attached to the housing. The brake device according to claim 1 or 2, wherein there is one pressing arm fixedly erected on the movable iron core. A long hole in the circumferential direction is formed in the resilient member, the resilient member is attached to the brake shoe or the housing through the elongated hole, and both ends of the brake shoe are movable in the torque receiving direction. The brake device according to claim 2 or 3. 5. The convex spherical portion is provided at the tip of the pressing arm, and a concave spherical seat is sandwiched between the brake shoe and the spherical portion of the pressing arm. Brake device. The brake device according to any one of claims 1 to 4, wherein a convex spherical surface portion is provided at a distal end of the pressing arm, and a concave portion is formed on a surface of the brake shoe that contacts the spherical surface portion of the pressing arm.

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