JP2002303341A - Braking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a braking device compact, especially to reduce a dimension along an axial direction. SOLUTION: In this inner part expanding type braking device B, a pair of electromagnetic brake parts 8 are oppositely installed at 180 deg. in correspondence with a brake drum inner peripheral surface 1a. Both ends of a brake shoe 18 are held by a protruding part 35 protrudingly provided on a fixing part 2a of a brake installing member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventional braking devices include a disk brake for pressing a friction material against both side surfaces of a disk and a drum brake for pressing a friction material from outside or inside a drum. As the actuator, a system such as a hydraulic system, a pneumatic system, an electromagnetic system, and a mechanical system has been used.

[0003]

Since such a conventional brake device requires a large space in the radial direction, and particularly in the axial direction, it can be downsized to be accommodated in the required space. Did not. Also, it was difficult to make the brake operation sound minute, and the structure was complicated, which made it difficult to assemble and make fine adjustments. Alternatively, there is a disadvantage that it is difficult to obtain the required output of the electromagnet in the limited space. SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, and to make it possible to accommodate compactly in a limited axial direction, and to make the operation sound extremely quiet, easy to finely adjust, and simple in structure. In providing a powerful and powerful braking device.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a pair of electromagnetic brakes corresponding to the inner peripheral surface of a brake drum.
In the internal expansion type brake device built in at a position opposite to 0 °, the distance between the movable iron core of the electromagnet of each of the electromagnetic brake units and the brake shoe disposed so as to be in contact with the inner peripheral surface of the brake drum is set. Connected by two parallel connecting members, the two connecting members are disposed near both ends of the brake shoe, and the base ends of the respective connecting members are fixedly mounted on the movable iron core, Has a torque receiving surface mounted on the brake shoe via a spherical seat and a flat seat, and receiving both ends of the brake shoe on a protrusion integrally formed with the brake mounting member.

[0005] The base end of each connecting member is screwed to the movable iron core so as to be able to advance and retreat freely, and the distal end of each connecting member is
A resilient member for constantly resiliently biasing the spherical seat and the flat seat in the pressure contact direction is provided. Further, a head is formed to bulge at the tip of the connecting member, a part of the spherical seat is constituted by the tip spherical portion of the head, and the back portion of the head is formed as a substantially conical surface portion, The resilient member is fixed to the back surface of the brake shoe as a leaf spring piece, and the tip of the leaf spring piece is brought into contact with the substantially conical surface portion.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the illustrated embodiments.

1 is a partial sectional front view, FIG. 2 is a plan view of an essential part, and FIG. 3 is a sectional side view of an essential part. Reference numeral 1 denotes a cylindrical brake drum, and FIG. , Or integrally protrudes from the braked rotating body M, or is fixed to the rotating body M and rotates integrally.

The rotating body M is a motor rotor, a winding drum or the like. As shown in FIG.
At the same time, it is installed in a place where the dimension is narrow in the axial direction C. Reference numeral 2 denotes a brake mounting member, which is fixed to a mounting surface 3 such as a wall by bolts or the like. The distance W between the mounting surface 3 and another surface 4 parallel to the mounting surface 3 is limited. For example.

In the illustrated embodiment, a hole 5 is formed in the center of the brake mounting member 2 and a bearing 6 is fitted into the hole 5 so that the shaft 7 of the rotating body M can rotate through the bearing 6. Is pivoted to. The axis of the shaft 7 coincides with the axis C ₀ of the brake drum 1.

Numerals 8 and 8 denote electromagnetic brake units which are 180 ° opposite to each other with respect to the inner peripheral surface 1a of the brake drum 1.
Arrange a pair. That is, as shown in FIG. 1, the pair of electromagnetic brake parts 8, 8 are rotationally symmetric with respect to the center point reference line L passing through the axis point O of the brake drum 1, or 180 ° with respect to the axis point O. It is arranged as.

Reference numeral 9 denotes a fixed iron core, which is provided in a direction parallel to the center section reference line L when viewed from the axial center direction C.
It has a substantially rectangular parallelepiped shape, and has mounting projections 10, 10 at its (left and right) ends as shown in FIG. 1, and is fixed by a bolt or the like (not shown) inserted into the hole 13 of the mounting member 2. Is done. The fixed iron core 9 is provided with a concave groove 12 into which an elliptical or elliptical electromagnetic coil 11 is fitted as shown in FIG. That is, when viewed from above in FIG. 1, a concave groove 12 is formed in an oval or elliptical shape, and the electromagnetic coil 11 is fitted and fixed in the concave groove 12.

Numeral 14 denotes a movable iron core, which has the shape of a rectangular plate (strip strip), which is attracted to the fixed iron core 9 when the electromagnetic coil 11 is excited, and from the fixed iron core 9 when it is not excited (FIG. 1). (Upward). Reference numerals 15 and 15 denote springs which constantly urge in the direction of their separation. The springs 15 and 15 are housed in the holes 16 and 16 shown in FIG. 17, 17 is the above spring 15,
Shows 15 resilient force adjustment bolts.

Reference numeral 18 denotes a brake shoe, and reference numeral 19 denotes a friction material (lining material), which is capable of directly contacting (sliding and pressing) the inner peripheral surface 1a of the brake drum 1. The brake shoe 18 is of a kamaboko type and has a friction material on its outer peripheral curved surface.
19 are laid. (Four in the illustrated example) are integrally protruded from the brake mounting member 2, and each of the protrusions 35 is provided on the circumferential end face of the brake shoe 18 (along the inner circumferential surface 1 a of the brake drum). A torque receiving surface 21 for receiving the rotational torque (in all circumferential directions) is formed.

As shown in FIG. 1 (in the axial direction C in FIG. 3)
The torque receiving surfaces 21 and 21 are orthogonal to the reference line L, the two torque receiving surfaces 21 and 21 are parallel to each other, and the brake shoe 18 is an internal expansion type electromagnetic brake unit. As a result, it is possible to press against the brake drum inner peripheral surface 1a from the radial inner direction.

As can be seen from FIG. 1, the fixed iron core 9, the movable iron core 14, and the brake shoe 18, which constitute the electromagnet,
Although arranged parallel to each other and parallel to the reference line L, the radial outer surface of the movable iron core 14 and the brake shoe
18 between the two parallel connecting members 23, 23
Are connected to each other.

That is, the two connecting members 23, 23 are disposed in a direction orthogonal to the reference line L, and are disposed near both ends of the brake shoe 18, and the base end of the connecting member 23 is a movable iron core. The front end is attached to the brake shoe 18 via a spherical seat Q and a flat seat P.

FIG. 5 is an enlarged view of a main part of FIG. 1. As shown in FIGS. 5 and 1, the connecting member 23 is specifically screwed into the screw hole 24 of the movable iron core 14. It has a screw portion 23a which is screwed so as to be able to adjust forward and backward, and also has a lock nut 25, and the friction material 19 of the brake shoe 18 in the non-braking state.
And a gap adjusting function for adjusting a gap between the brake drum and the inner peripheral surface 1a of the brake drum.

Reference numeral 26 denotes a resilient member for constantly urging the distal end of each connecting member 23 in the direction in which the spherical seat Q and the flat seat P are pressed against each other. Specifically, a leaf spring piece 26 fixed to the inner side surface (rear surface) of the brake shoe 18 with bolts 27, 27
a to form a resilient member, and this leaf spring piece 26
1a is bent in FIGS. 1 and 5, but has a straight shape (single-character cross-sectional shape) in the width direction.

At the distal end of the connecting member 23, a flat head 28 is formed to bulge, and the distal end surface of the head 28 is spherical, and a distal spherical portion 29 is provided. Is configured.
Reference numeral 30 denotes an intermediate receiving plate, and a concave spherical portion 30a is provided on the inner surface (rear surface).
The concave spherical portion 30a is slidably contacted with the distal spherical portion 29 to form a joint {Spherical seat Q} capable of swinging.

The inner surface (back surface) of the brake shoe 18
Is provided with a shallow concave portion 31, which is 0.5 mm-2.0 mm (preferably 0.8 mm-
Intermediate receiver 30 that is smaller by 1.5mm)
5 and a plane seat P capable of sliding by a small dimension in the left-right direction of FIG. 5 and the direction perpendicular to the paper surface of FIG.
Is composed. As described above, the spherical seat Q · in FIG.
It can be seen that the flat seat P is extremely compact.

The back portion of the (flat) head 28
The ─base end 端 is defined as a substantially conical surface portion 32, and
The tip of a is brought into contact. Thus, the brake shoe 18
The ends (of a straight shape in the width direction) of the leaf spring piece 26a fixed to the back surface of the spring are elastically brought into contact with each other, so that the spherical seat Q and the flat seat P
, The smooth operation can be performed without obstructing the swinging action of the spherical seat Q and the two-dimensional sliding action of the flat seat P.

As shown in FIGS. 1 and 3 and FIG. 4 (showing a cross section taken along the line Y--Y in FIG. 1), the brake mounting member 2 has a plate shape such as a circular shape, a plate shape with a window, a frame shape, or the like. Fixing portion 2a (to the mounting surface 3) and a substantially rectangular parallelepiped (square rod) fixed iron mounting portion 2b integrally protruding from the fixing portion 2a.
And is constituted. A hole 5 into which the bearing 6 is fitted is formed in the fixed core mounting portion 2b.

In other words, the mounting portion 2b is disposed along the center section reference line L, and protrudes into the brake drum 1 so as not to interfere (set to be shorter than the inner diameter of the brake drum 1). ing.

The above-mentioned protrusions 35 having the torque receiving surface 21.
Indicates a case where the fixing portion 2a is provided integrally with and protruding from the front surface of the fixing portion 2a. In this way, the protrusion 35 has a small size, and is mechanically (small) advantageous to the force received from the brake shoe 18.

As will be apparent from the above description and the drawings, the present invention can realize a reduction in thickness in the axial center direction C.
This is an internal expansion type brake device that can exert strong braking power.

And the basic operation is a spring (for braking)
At 15, 15, the movable iron core 14, the two connecting members 23, 23, and the brake shoe 18 are pressed radially outward (in the radial direction), and the friction material 19 is pressed against the brake drum inner peripheral surface 1a to perform braking. State. On the other hand, when the electromagnetic coil 11 is energized (ON state), the movable iron core 14 is attracted, and the brake shoe 18 is drawn in the radial direction via the two connecting members 23, 23, etc., so that non-braking (release) is performed. State. The gap between the friction material 19 and the inner peripheral surface 1a of the brake drum is desirably set to 0.10 mm to 0.20 mm (non-braking state). In the present invention, such a very small gap can be provided. It is. That is, a leaf spring piece
26a (resilient member 26) eliminates the clearance between the contact surfaces of the spherical seat Q and the flat seat P (zero), and further uses two adjustment bolts (connecting members 23, 23) to rotate in the rotational direction. This is because a structure that can equalize the gap between the two is adopted. As described above, according to the present invention, by setting the above-mentioned very small gap, a device with extremely low brake operation noise can be provided, and the brake shoe 18 (the friction material 19) can be provided when not operating.
Subtle adjustments to eliminate the drag phenomenon have become easier.

The fixing portion 2a of the brake mounting member 2
Of the torque receiving surface 2
Since both ends (surfaces) of the brake shoe 18 are received by forming the first and the second 21, it is possible to achieve a very compact structure in the axial direction C. It can be accommodated. That is, even in a place (place) where the interval dimension W in FIG.
Can be installed.

The leaf spring piece 26a has a (flat) head end.
The portion of the rear surface of the plate 28 that contacts the substantially conical surface portion 32 is
In the width direction of a, a straight shape (one character type whose cross section is not curved) is used, so that the operation of the spherical seat Q and the flat seat P operates smoothly (without being hindered), and furthermore, the brake drum inner peripheral surface 1a The brake shoe 18 once contacted moves parallel to the axis parallel direction with the same angle posture when the brake is released, so that the inner peripheral surface 1a of the brake drum and the brake shoe 18 have an extremely small and uniform uniform gap over the entire surface. Become. Therefore, the brake operation sound becomes quieter, and the shoe drag phenomenon during non-braking can be more effectively prevented.

The present invention is an internal expansion type brake device suitable for a hoisting machine or the like, but the application is not limited and can be freely applied to each surface.

[0030]

The present invention has the following remarkable effects by the above-mentioned structure.

(According to claim 1) As a brake device for a hoisting machine or the like, it can be compactly installed even in a narrow space in the axial direction C. That is, the electromagnetic brake portions 8 can be stored in the brake drum 1 which is thin in the axial direction C.

Further, it is possible to reliably receive a tangential force acting on the brake shoe 18 (a rotational torque acting in the turning direction during braking). In addition, since the left and right length dimensions of the movable iron core 14 can be increased, a sufficiently powerful output of the electromagnet can be obtained (although the whole is compact).

[0033] According to the first and second aspects, the inner circumferential surface 1a of the brake drum and the brake shoe 18 can be easily adjusted to have a small and uniform uniform clearance, and the operating noise can be reduced, resulting in extremely quiet operation. Become. According to the third aspect, the structure can be simplified. And the silent brake operation with further reduced operating noise can be realized.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is an explanatory plan view of a main part.

FIG. 3 is a sectional side view of a main part.

FIG. 4 is a sectional view taken along line YY of FIG. 1;

FIG. 5 is an enlarged view of a main part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brake drum 1a (Brake drum) inner peripheral surface 2 Brake mounting member 2a Fixed part 8 Electromagnetic brake part 9 Fixed iron core 14 Movable iron core 18 Brake shoe 21 Torque receiving surface 23 Connecting member 26 Resilient member 26a Leaf spring piece 28 Head 29 Tip spherical part 35 Projection part C axis direction L Center division reference line P Plane seat Q Spherical seat

Continued on the front page F term (reference) 3J058 AA03 AA07 AA13 AA17 AA24 AA30 AA38 AA39 BA67 CA01 CC07 CC13 CC72 CC73 CC77 FA39

Claims (3)

[Claims] In an internal expansion type brake device in which a pair of electromagnetic brake portions are built in opposite positions of 180 ° corresponding to the inner peripheral surface of a brake drum, a movable iron core of an electromagnet of each of the electromagnetic brake portions; Two parallel connecting members are connected between the brake shoe and a brake shoe disposed so as to be in contact with the inner peripheral surface of the brake drum. The two connecting members are disposed near both ends of the brake shoe. And, the base end of each of the connecting members is fixedly erected on the movable iron core, the front end is attached to the brake shoe via a spherical seat and a flat seat, and further has a torque receiving surface for receiving both ends of the brake shoe. A brake device, wherein the brake device is formed on a protruding portion integral with a brake mounting member. 2. A base end of each connecting member is screwed to a movable iron core so as to be capable of being advanced and retracted, and a distal end of each connecting member is constantly resiliently urged in a pressing direction of a spherical seat and a flat seat. The brake device according to claim 1, wherein the resilient member is provided. 3. A swelling head is formed at the tip of the connecting member,
A part of the spherical seat is constituted by a tip spherical part of the head, and a rear part of the head is substantially a conical surface part. Further, the resilient member is fixed to a rear surface of the brake shoe as a leaf spring piece. 3. The brake device according to claim 2, wherein the distal end of the leaf spring piece abuts on the substantially conical surface portion.