JP2007002906A - Braking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce substantially the time and trouble which are required to adjust a clearance between the inner peripheral surface of a brake drum and a frictional material. <P>SOLUTION: There is provided an internally expanding type braking device in which a pair of electromagnetic brake parts 7, 7 is equipped with a fixed iron core 8, a movable iron core 9 capable of freely abutting against and freely separating from the fixed iron core 8, and a brake shoe 3 arranged in such a manner as to be able to abut against the inner peripheral surface 1a of the brake drum 1 and which is formed with a torque receiving faces 19, 19 for receiving both inner circumferential ends of the brake shoe 3 are formed in a brake mounting fixation member 2. The movable iron core 9 and the brake shoe 3 are coupled by one coupling member 4. Besides, a basal end of the coupling member 4 is fixed to the movable iron core 9 in a standing manner and an apical end of the coupling member 4 is fixed to the brake shoe 3 via a spherical seat Q. Further, the coupling member 4 is arranged at a central position of the brake shoe 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

2. Description of the Related Art Conventionally, there is a drum brake (braking) device that presses a friction material from the inside of a brake drum in which a brake shoe provided with a friction material and a movable iron core are connected by two connecting members. Then, the gap between the inner peripheral surface of the brake drum and the friction material is adjusted to be minute and equally spaced by using the two connecting members as adjustment bolts (see, for example, Patent Document 1).
JP 2002-303341 A

However, since the conventional drum brake device adjusts the gap between the inner peripheral surface of the brake drum and the friction material with the two connecting members, the adjustment takes time and effort.
Conventionally, since the bolt for attaching the brake device to the fixing member has been fastened in a direction perpendicular to the axis of the brake drum, a tool or the like is inserted into the brake drum from the axial direction of the brake drum. It was a difficult task to install and remove.
Therefore, the present invention provides a brake device that can significantly reduce the time and labor required for adjusting the gap between the inner peripheral surface of the brake drum and the friction material and that can be easily detached from the brake drum. For the purpose.

  In order to achieve the above object, in the brake device according to the present invention, a pair of electromagnetic brake portions can contact a fixed iron core, a movable iron core that can be brought into contact with and separated from the fixed iron core, and an inner peripheral surface of the brake drum. An internal expansion type brake device in which a torque receiving surface for receiving both ends of the brake shoe in the circumferential direction of the brake drum is formed on a brake mounting fixing member. The brake shoe is connected to the brake shoe by a single connecting member, the base end of the connecting member is fixedly erected on the movable iron core, and the tip is attached to the brake shoe via a spherical seat. Further, the connecting member is disposed at a central position of the brake shoe.

  The fixed iron core has two electromagnetic coils arranged in parallel on the contact surface side with the movable iron core.

  Further, a pair of misalignment prevention members that contact the end surface of the brake shoe in the axial direction of the brake drum are provided.

  The electromagnetic brake portion is disposed in a storage portion surrounded by the brake mounting fixing member and the brake drum, and the brake mounting fixing member slides the electromagnetic brake portion in the axial direction of the brake drum. It has a window part which can be taken out from the storage part.

  The fixed iron core has a through hole in the direction of the axis of the brake drum, and the fixed iron core is attached to the brake mounting fixing member with a fixing bolt inserted into the through hole.

The present invention has the following remarkable effects.
According to the brake device of the present invention, since the movable iron core and the brake shoe are connected to each other via one connecting member and the spherical seat, the gap between the inner peripheral surface of the brake drum and the brake shoe (friction material thereof). Can be easily adjusted to be minute and equispaced with a single connecting member, and the labor and time required for the adjustment can be greatly reduced.
Further, the swinging (swinging) range of the connecting member is increased, the swinging (swinging) is smooth, and the contact performance of the brake shoe (the friction material) against the inner peripheral surface of the brake drum is improved. That is, the brake shoe (friction material) can be evenly contacted (sliding contact / pressing contact) with the entire inner surface of the brake drum, and the brake drum can be reliably braked.
In addition, it is easy to attach and remove the electromagnetic brake portion from the direction of the brake drum axis. As a result, the electromagnetic brake unit can be repaired and replaced easily and quickly, and the work load can be reduced.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 is a partial cross-sectional front view, FIG. 2 is a main portion front view, and FIG. 3 is a main portion cross-sectional side view. Reference numeral 1 is a cylindrical brake drum. It is pivotally supported by the fixing member 2 for rotation. The shaft center of the shaft 20 coincides with the shaft center point O of the brake drum 1. The brake mounting fixing member 2 includes a plate surface portion 2a orthogonal to the shaft 20 of the brake drum 1, a rotation support portion 2b that is integrally provided from the plate surface portion 2a and receives the shaft 20 via a bearing (not shown), have.

  An electromagnetic brake unit 7 is disposed in a storage unit 6 surrounded by the brake mounting fixing member 2 and the brake drum 1. Two electromagnetic brake portions 7 are disposed at positions opposite to each other by 180 ° corresponding to the inner peripheral surface 1a of the brake drum 1, that is, as shown in FIG. 1, a central section passing through the axial center O of the brake drum 1 With respect to the reference line L, the pair of electromagnetic brake portions 7 and 7 are arranged in a line-symmetrical manner or as a 180 ° rotational symmetry (point symmetry) with respect to the axis O.

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. Moreover, the electromagnetic brake part 7 is provided with the brake shoe 3, and the brake shoe 3 can be press-contacted to the brake drum inner peripheral surface 1a from the radial inner direction as an internal expansion type electromagnetic brake device. The brake shoe 3 has a rectangular flat pad portion 3a, and a substantially bowl-shaped friction that can be directly contacted (sliding contact / pressure contact) with the inner peripheral surface 1a of the brake drum 1 on the radially outer surface of the pad portion 3a. A material (lining material) 21 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. .

  Furthermore, four projecting portions 27 are integrally projected from the plate surface portion 2a of the brake mounting fixing member 2 into the housing portion 6, and the projecting portions 27 are provided in pairs of two as two pairs. (Along the drum inner peripheral surface 1a), it is provided at both ends in the circumferential direction. The projecting portion 27 has torque receiving surfaces 19 and 19 that receive rotational torque in the circumferential direction of the brake shoe 3. The torque receiving surfaces 19, 19 are in contact with the circumferential end surface of the pad portion 3 a of the brake shoe 3 and are arranged in a direction orthogonal to the reference line L.

  The movable iron core 9 and the brake shoe 3 are connected to each other by a single connecting member 4. The connecting member 4 is provided in the direction orthogonal to the reference line L (and in the radial direction), and is disposed at the center position of the brake shoe 3 (see FIG. 4). Further, the base end of the connecting member 4 is fixedly erected on the radially outer surface of the movable iron core 9, and the distal end is attached to the radially inner surface of the brake shoe 3 via the spherical seat Q.

  Specifically, the connecting member 4 has a threaded portion 4 a that is screwed into the threaded hole 22 of the movable iron core 9 so as to be able to advance and retract. The connecting member 4 has a lock nut 23 and has a gap adjusting function for adjusting the gap between the friction material 21 and the brake drum inner peripheral surface 1a in the non-braking state.

Further, a flat head 4b is bulged and formed at the tip of the connecting member 4, the tip surface of the head 4b is spherical, a tip spherical portion 24 is provided, and a part of the spherical seat Q is provided. Configure (see FIG. 2).
An intermediate receiving plate 25 is attached to the radially inner surface of the pad portion 3 a of the brake shoe 3, and a concave spherical surface portion with which the spherical end portion 24 of the head 4 b of the connecting member 4 abuts on the radially inner surface of the intermediate receiving plate 25. 26 (see FIG. 2). A sliding joint between the concave spherical surface portion 26 and the tip spherical surface portion 24 constitutes a joint that can swing, a spherical seat Q.
The head 4 b of the connecting member 4 is held in close contact with the intermediate receiving plate 25 by the retainer 31.

  As shown in FIGS. 8A, 8B, and 8C, a retainer 31 formed of a thin plate is orthogonal to the substrate portion 32 having a circular hole 32a and the opening edge of the circular hole 32a. Two pairs of L-shaped presser pieces 33 projecting in the direction and bent at the front end side in the inner diameter direction, and two opposite sides of the outer peripheral edge of the substrate portion 32 on the opposite side of the presser piece 33 and It has a pair of sandwiching plate portions 34, 34 provided in a direction orthogonal to the substrate portion 32. The clamping plate portion 34 has a U-shaped curved portion 34a at the leading edge thereof, and projecting pieces 35, 35 on the other two sides of the outer peripheral edge of the substrate portion 32 (where the clamping plate portion 34 is not provided). Are connected.

  Then, the brake shoe 3 is fitted between the pair of sandwiching plate portions 34, 34, the curved portion 34 a is hooked on the radially outer surface of the pad portion 3 a of the brake shoe 3, and the pressing piece 33 is connected to the connecting member 4. The inner surface (back surface) in the radial direction of the head 4b is held like a grip (see FIG. 3).

In order to prevent the brake shoe 3 from moving and swinging in the brake drum axial direction C, a pair of misalignment prevention members 15 and 15 are provided. This misalignment prevention member 15 is a band-shaped metal member arranged in parallel to the reference line L, and both ends thereof are attached to the projecting portions 27, 27 in a bridging manner by stoppers 29, 29 such as bolts. ing.
Further, as shown in FIG. 4, the misalignment preventing members 15 and 15 are disposed on the end face side of the brake shoe 3 in the axial direction C of the brake drum. The misalignment prevention member 15 has two pressing portions 30 and 30 that are formed in a protruding shape toward the brake shoe 3 by pressing, and the pressing portion 30 is in the axial direction of the pad portion 3 a of the brake shoe 3. It is in contact with the end face of C.

The fixed iron core 8 has a rectangular parallelepiped body 38 disposed in parallel to the reference line L, and mounting protrusions 39, 39 are suspended at the (left and right) ends of the body 38 as shown in FIG. Is provided. The mounting protrusion 39 is disposed perpendicular to the brake drum axial direction C. The projecting piece 39 is formed with a through hole 11 (parallel) in the axial direction C, and the fixed iron core 8 is attached to the fixing member 2 with a fixing bolt 12 inserted into the through hole 11. Further, the mounting protrusion 39 is provided with a knock pin 61 for positioning when the fixed iron core 8 is attached to the fixing member 2.
The fixing member 2 has a mounting wall portion 2c that is integrally projected from the rotation support portion 2b to the storage portion 6 side, and a female screw hole 44 into which the tip end portion of the fixing bolt 12 is screwed. It penetrates in parallel with the central direction C (see FIG. 3).

In FIG. 1, reference numeral 17 denotes a spring member that constantly urges and urges the movable iron core 9 in a direction to separate the movable iron core 9 from the fixed iron core 8. The holes are accommodated in holes 28a and 28b formed in the contact surfaces 16 and 13, respectively. Further, the elastic force adjusting bolt 36 of the spring member 17 is inserted into the insertion hole 37 continuing from the radially outer surface of the movable iron core 9 to the hole portion 28a in which the spring member 17 is accommodated. Further, two spring members 17 and elastic force adjusting bolts 36 are provided on the left and right as shown in FIG.
Further, a guide pin 43 that guides the movable iron core 9 from coming into contact with and separated from the fixed iron core 8 is inserted into and attached to the hole 41 formed in the contact surface (radial inner surface) 16 of the movable iron core 9. Yes. A guide hole 42 into which the guide pin 43 is slidably inserted is formed in the contact surface (radial outer surface) 13 of the fixed iron core 8.

  The movable iron core 9 has a rectangular flat substrate portion 45 and a stepped portion 46 attached to the center of the radially outer surface of the substrate portion 45 (see FIGS. 5 and 6). The base end of the connecting member 4 and the resilience adjusting bolts 36 and 36 are disposed in a step portion 46 (see FIG. 5), and the step portion 46 is formed in an oval shape or a track shape in plan view (see FIG. 6). ).

Furthermore, two annular electromagnetic coils 5 and 5 are arranged on the fixed iron core 8 in parallel on the contact surface 13 side with the movable iron core 9. That is, the two electromagnetic coils 5 and 5 are arranged side by side on the left and right of the main body 38 of the fixed iron core 8 as shown in FIG.
An annular groove 40, 40 is formed on the contact surface 13 of the main body 38 (see FIG. 7), and the electromagnetic coil 5 is fitted in the groove 40.

1 and 3, a window portion 10 is formed on the plate surface portion 2 a of the fixing member 2 so that the electromagnetic brake portion 7 can be slid in the axial direction C and taken out from the storage portion 6.
As shown in FIG. 1, the window portion 10 is formed by hollowing out the plate surface portion 2a into a substantially convex shape or a substantially bowl shape, and is provided with an electromagnetic brake portion 7 disposed in the storage portion 6 and a misalignment prevention member 15. Are visible through the window 10 from the axial direction C of the brake drum.

Specifically, the window portion 10 includes a large arc-shaped hole portion 49 formed by cutting out the plate surface portion 2a at a position corresponding to the movable iron core 9 and the fixed iron core 8, the friction material 21, the brake shoe 3, and the prevention of displacement. It has a small arc-shaped hole 50 formed by cutting out the plate surface portion 2a at a position corresponding to the member 15 or the like. The small arc-shaped hole portion 50 is formed continuously outward from the large arc-shaped hole portion 49, and the large arc-shaped hole portion 49 and the small arc-shaped hole portion 50 are formed in a substantially arc shape with the brake drum axis O as the center. Has been.
In FIG. 1, a cable (not shown) that is electrically connected to the electromagnetic coil 5 is attached to the left end portion of the main body 38 of the fixed iron core 8. An enlarged portion 49a is formed on the left side of the large arc-shaped hole portion 49 so that the edge of the window portion 10 does not interfere when connecting to an external power source or the like.

  In FIG. 5 and FIG. 7, six cushioning members 14 are arranged on the contact surface 13 of the fixed iron core 8 with the movable iron core 9. The shock absorbing material 14 reduces the operating noise when the fixed bolt and the movable iron core 9 come close to each other, and as shown in FIG. 5, the contact surfaces 16 of the movable iron core 9 and the fixed iron core 8 respectively. , 13, a cushioning material 14 is interposed, so that a slight gap S is formed. The cushioning material 14 is a flat annular rubber member, and is fitted into a counterbore 47 formed at a substantially equal pitch on the peripheral edge of the fixed core main body 38.

  Further, eight auxiliary compression springs for contacting and separating the movable iron core 9 in parallel with the fixed iron core 8 between the peripheral portions of the contact surfaces 16 and 13 of the movable iron core 9 and the fixed iron core 8. 18 is provided. The auxiliary compression spring 18 is inserted into an insertion hole 48 formed in the peripheral edge portion of the fixed core body portion 38. Four insertion holes 48 are arranged around the concave groove 40 into which the electromagnetic coil 5 is fitted, and the insertion holes 48 arranged at the corners of the main body 38 are formed at the bottom of the counterbore 47. Has been.

The use method (action) of the brake device of the present invention described above will be described.
As shown in FIG. 1, the movable iron core 9, the connecting member 4, and the brake shoe 3 are pressed radially outward (in the radial direction) by spring members 17 and 17 (for braking) to brake the friction material 21. The drum inner peripheral surface 1a is pressed to be in a braking state. On the other hand, when the electromagnetic coil 5 is energized (ON state), the movable iron core 9 is attracted, and the brake shoe 3 is drawn in the radial direction via the connecting member 4 and the like, and is brought into a non-braking (open) state.

A method for taking out the electromagnetic brake unit 7 from the storage unit 6 will be described.
In FIG. 1 and FIG. 3, first, of the pair of misalignment prevention members 15 and 15 (disposed on the end face of the brake shoe 3), the misalignment prevention member 15 disposed on the window 10 side is stopped. Remove the tools 29, 29 and remove them from the projections 27, 27.
Next, the fixing bolt 12 is removed from each mounting protrusion 39 of the fixed iron core 8, the guide rod 60 is inserted from the window portion 10 into the through hole 11 of the mounting protrusion 39, and the tip of the guide rod 60 is mounted. It inserts into the female screw hole 44 of the wall part 2c (refer FIG. 9). The base end of the guide rod 60 is supported by a support member (not shown), and the guide rod 60 is disposed in parallel with the shaft 20 of the brake drum 1. Then, as shown in FIG. 9, the electromagnetic brake part 7 is slid in the brake drum axial direction C along the two guide rods 60, 60 and taken out from the window part 10 to the outside.

As described above, in the brake device of the present invention, the pair of electromagnetic brake portions 7, 7 are provided on the fixed iron core 8, the movable iron core 9 that can be brought into contact with and separated from the fixed iron core 8, and the inner peripheral surface 1 a of the brake drum 1. And a brake shoe 3 disposed so as to be capable of abutting, and an internally expanded brake device in which torque receiving surfaces 19 and 19 for receiving both ends of the brake shoe 3 in the circumferential direction of the brake drum are formed on the brake mounting fixing member 2. In this case, the movable iron core 9 and the brake shoe 3 are connected by a single connecting member 4, the base end of the connecting member 4 is fixedly erected on the movable iron core 9, and the tip is a spherical seat. Since it is attached to the brake shoe 3 via Q, and the connecting member 4 is disposed at the center position of the brake shoe 3, there is a gap between the brake drum inner peripheral surface 1a and the brake shoe 3 (the friction material 21). Is fine with one connecting member 4 And easily be adjusted to equal gaps, such labor and time in the adjustment can be greatly reduced.
In addition, since the movable iron core 9 and the brake shoe 3 are connected to one connecting member 4 via the spherical seat Q, the swinging (swinging) range of the connecting member 4 is increased, and the swinging (swinging) ) Is smooth, and the contact of the brake shoe 3 (the friction material 21) with the inner peripheral surface 1a of the brake drum is improved. That is, the brake shoe 3 (the friction material 21) can be uniformly contacted (sliding / pressing) with the inner peripheral surface 1a over the entire surface, and the brake drum 1 can be reliably braked.

  In addition, since two electromagnetic coils 5 and 5 are arranged on the fixed iron core 8 on the contact surface 13 side with the movable iron core 9, the thickness dimension in the radial direction (radial direction) of the fixed iron core 8 is reduced. Therefore, a sufficiently strong electromagnet output can be obtained while reducing the overall size and weight. Further, the cost can be reduced by reducing the size and weight of the brake device.

  In addition, since the pair of misalignment prevention members 15 and 15 that contact the end surface of the brake shoe 3 in the axial direction C of the brake drum are provided, the brake shoe 3 moves or swings in the axial direction C of the brake drum and is displaced. The brake shoe 3 (the friction material 21) can be stably brought into full contact (sliding contact / pressure contact) with the brake drum inner peripheral surface 1a, and the brake drum 1 is reliably braked. Can do.

  The electromagnetic brake portion 7 is disposed in a storage portion 6 surrounded by the brake mounting fixing member 2 and the brake drum 1, and the brake mounting fixing member 2 moves the electromagnetic brake portion 7 in the brake drum axial direction C. Since it has the window part 10 which can be slid and taken out from the storage part 6, a tool etc. can be inserted in the storage part 6 from the window part 10, and the installation and removal of the electromagnetic brake part 7 can be performed easily. The electromagnetic brake unit 7 can be easily taken in and out of the storage unit 6. As a result, the electromagnetic brake unit 7 can be repaired and replaced easily and quickly, and the work load can be reduced.

  The fixed iron core 8 has a through hole 11 in the brake drum axial direction C, and the fixed iron core 8 is attached to the brake mounting fixing member 2 by a fixing bolt 12 inserted into the through hole 11. Attachment / removal of the electromagnetic brake portion 7 from the brake drum axial direction C is facilitated. As a result, the electromagnetic brake unit 7 can be repaired and replaced easily and quickly, and the work load can be reduced.

It is a partial cross section front view which shows embodiment of this invention. It is a principal part front view. It is a principal part sectional side view. It is a principal part top view. It is a principal part front view. It is a top view of a movable iron core. It is a top view of a fixed iron core. It is explanatory drawing of a retainer, Comprising: (a) is cross-sectional side explanatory drawing, (b) is front explanatory drawing, (c) is bottom explanatory drawing. It is a sectional side view for explanation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake drum 1a Inner peripheral surface 2 Brake mounting fixed member 3 Brake shoe 4 Connecting member 5 Electromagnetic coil 6 Storage part 7 Electromagnetic brake part 8 Fixed iron core 9 Movable iron core
10 Window
11 Through hole
12 Fixing bolt
13 Contact surface
15 Misalignment prevention member
19 Torque bearing surface C Brake drum axial direction Q Spherical seat

Claims (5)

A pair of electromagnetic brake portions (7), (7) includes a fixed iron core (8), a movable iron core (9) that can be brought into contact with and separated from the fixed iron core (8), and an inner peripheral surface (1a) of the brake drum (1). And a brake shoe (3) disposed so as to be able to abut against it, and a torque receiving surface (19) for receiving both ends of the brake shoe (3) in the circumferential direction of the brake drum on the brake mounting fixing member (2) In the internal expansion type brake device that forms (19),
The movable iron core (9) and the brake shoe (3) are connected by a single connecting member (4), and the base end of the connecting member (4) is connected to the movable iron core (9). It is fixedly erected, the tip is attached to the brake shoe (3) via a spherical seat (Q), and the connecting member (4) is disposed at the center position of the brake shoe (3). Brake device characterized by that.   2. The brake device according to claim 1, wherein two electromagnetic coils (5) and (5) are juxtaposed on the fixed iron core (8) on the contact surface (13) side with the movable iron core (9).   The brake device according to claim 1 or 2, further comprising a pair of misalignment prevention members (15) and (15) that come into contact with an end surface of the brake shoe (3) in the axial direction (C) of the brake drum.   The electromagnetic brake portion (7) is disposed in a storage portion (6) surrounded by the brake mounting fixing member (2) and the brake drum (1), and the brake mounting fixing member (2) 4. The brake device according to claim 1, further comprising a window portion (10) capable of sliding the electromagnetic brake portion (7) in the direction of the axis of the brake drum axis (C) and taking out from the storage portion (6).   The fixed iron core (8) has a through hole (11) in the axial direction (C) of the brake drum, and the fixed iron core (8) is fixed by the fixing bolt (12) inserted into the through hole (11). The brake device according to claim 4, wherein the brake device is attached to a brake attachment fixing member (2).

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