Disc brake device

Abstract

To provide a disc brake device that can reliably keep and release a braking state with a simple mechanism.SOLUTION: A disc brake device 1 for tightly holding a brake disc 2 having a rotational axis 100 in a horizontal direction with right and left brake linings (8L, 8R) includes: right and left slide plates (6L,6R) to which the brake linings are fitted and which move in parallel in the horizontal direction while facing each other; and a spring mechanism 20 and a hydraulic cylinder 30 for biasing the right and left slide plates in directions of being proximate to or separate from each other. The hydraulic cylinder is of an opposed piston type using the horizontal direction as a cylindrical axis 101 and including pistons (33L, 33R) on right and left sides respectively connected to the right and left slide plates. The right and left slide plates are separated from each other with the internal hydraulic pressure of a cylinder tube 32 to release braking and, when the hydraulic oil is discharged from the cylinder tube, the right and left slide plates move toward each other to bring the brake disc into a braking state.SELECTED DRAWING: Figure 3B

Description

[Technical Field]

[0001] The present invention relates to a disc brake device. [Background technology]

[0002] An industrial disc brake device generates braking force by sandwiching both the front and back surfaces of a brake disc, which rotates and is connected to a driving body (e.g., a wheel, a belt, etc.) of a work machine such as a hoist, between brake linings, which are friction materials. An example of a conventional disc brake device 10 is shown in FIGS. 1A and 1B. These are enlarged views of the main components of the disc brake device 10. FIG. 1A shows the disc brake device 10 in a braking state, and FIG. 1B shows the disc brake device 10 in a released state. In the following description, a plane including the front-rear and left-right directions is defined as a horizontal plane, and a rotation axis 100 of the brake disc 2 is assumed to extend in the left-right direction. FIGS. 1A and 1B show front views of the disc brake device 10 placed on a horizontal plane, as viewed from the front-rear direction.

[0003] 1A and 1B, a pair of brake levers (13L, 13R) extend upward and face each other on both the left and right sides of the brake disc 2, and brake linings (15L, 15R) are attached to the brake disc 2 side of the left and right brake levers (13L, 13R) midway through their extension via brake shoes 14. The left and right brake levers (13L, 13R) have rotation shafts (16L, 16R) extending in the front-rear direction at their lower ends, and swing left and right in unison via a link mechanism (not shown) connected to their upper ends.

[0004] The link mechanism is configured to be driven by a thruster consisting of an electric hydraulic cylinder, as in the disc brake device described in Patent Document 1 below, for example. As shown in Fig. 1A, in a braking state of a disc brake device 10, the left and right brake levers (13L, 13R) swing toward each other, and the brake linings (15L, 15R) clamp the brake disc 2, resulting in a closed state. When the braking state is released, as shown in Fig. 1B, the left and right brake levers (13L, 13R) swing away from each other, creating a gap x between the brake disc 2 and the brake linings (15L, 15R), resulting in an open state. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6767064 Summary of the Invention [Problem to be solved by the invention]

[0006] The conventional disc brake device 10 shown in Figures 1A and 1B has a basic structure in which brake linings (15L, 15R) are attached to each of two brake levers (13L, 13R) that swing toward and away from the brake disc 2, but it also requires a complex link mechanism to swing the two brake levers (13L, 13R) in sync.

[0007] Furthermore, in the conventional disc brake device 10, the drive source for releasing the brake and the drive source for applying the brake are connected to the same link mechanism, so the operating range of one drive source is limited by the operating range of the other drive source. Specifically, as in the disc brake device described in Patent Document 1, the drive source for releasing the brake can be configured, for example, by a thruster formed by an electric hydraulic cylinder, and the drive source of the brake lever for applying the brake can be configured by a spring mechanism.

[0008] In the brake device described in Patent Document 1, the braking state is released when the thruster piston is hydraulically pushed up against the biasing force of the spring via the link mechanism. When the thruster is deactivated, for example, due to power cutoff, the spring pushes the thruster piston down via the link mechanism, and the disc brake device enters a braking state. Therefore, the position at which the left and right brake levers are closest to each other by the spring mechanism depends on the bottom dead center position of the pistons. As a result, if the brake linings wear, even when the left and right brake levers are closest to each other, the brake linings may not be pressed against the brake disc with sufficient force, making it impossible to maintain the braking state. In the brake device described in Patent Document 1, a mechanism (automatic wear adjustment device) is incorporated into the link mechanism to gradually narrow the angle between the left and right brake levers (symbol α in Figure 1B) when the braking is released depending on the wear state of the brake linings, further complicating the link mechanism.

[0009] Therefore, an object of the present invention is to provide a disc brake device that can reliably maintain and release a braking state using a simple mechanism, without using a complex mechanism such as a link mechanism. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention provides a disc brake device that applies a brake to the rotation of a brake disc having a rotation axis in the left-right direction by sandwiching the brake disc between left and right brake linings that face each other in the left-right direction, a left slide plate to which the left brake lining is attached and which is movable in parallel in the left-right direction; a right slide plate to which the right brake lining is attached and which faces the left slide plate and is movable in parallel in the left-right direction; a spring mechanism that biases the left and right slide plates in a direction that brings them closer to each other; a hydraulic cylinder that biases the left and right slide plates in directions that move them apart from each other; Equipped with The hydraulic cylinder is an opposed piston type having left and right pistons that move symmetrically in the left-right direction relative to one cylinder tube having a cylinder axis in the left-right direction, the left and right pistons are connected to the left and right slide plates, respectively; When hydraulic oil is filled into the cylinder tube, the left and right slide plates move in directions away from each other, and the brake is released. When the hydraulic oil in the cylinder tube is discharged, the left and right slide plates move closer to each other, and the brake disc is sandwiched between the left and right brake linings, thereby achieving a braking state. It is a disc brake device.

[0011] The spring mechanism may also be configured as a disc brake device including a rod whose tip is fixed to one of the left and right slide plates and slidably penetrates the other of the left and right slide plates to protrude outward, and a spring that is compressed between the base end of the rod and the other of the left and right slide plates.The disc brake device may also include a plurality of such spring mechanisms.

[0012] The disc brake device may be any of the above, wherein the slide plate is disposed between two side plates facing each other in the left-right direction and fixed on a base, the side plates have a C-shaped frame shape that is open in either the front or rear direction, and the slide plate is exposed on the inside of the C-shaped frame of the side plates. [Effects of the Invention]

[0013] According to the present invention, a disc brake device is provided that can reliably maintain and release a braking state using a simple mechanism, without using a complex mechanism such as a link mechanism. Other advantages will become clear in the following description. [Brief explanation of the drawings]

[0014] [Figure 1A] FIG. 10 is a diagram showing a braking state in a conventional disc brake device. [Figure 1B] FIG. 10 is a diagram showing a state in which braking is released in a conventional disc brake device. [Figure 2A] 1 is a diagram showing the appearance of a disc brake device according to an embodiment. [Figure 2B] 1 is a diagram showing the appearance of a disc brake device according to an embodiment. [Figure 3A] 1 is a front view of a disc brake device according to an embodiment of the present invention; [Figure 3B] FIG. 2 is a rear view of the disc brake device according to the embodiment. [Figure 4] 1 is a diagram showing a fixing structure of a hydraulic cylinder provided in a disc brake device 1 according to an embodiment. [Figure 5A] 5A and 5B are diagrams illustrating the operation of the hydraulic cylinder when the disc brake device according to the embodiment is in a braking state. [Figure 5B] 10A and 10B are diagrams illustrating the operation of the hydraulic cylinder when the brake is released in the disc brake device according to the embodiment. [Figure 6] 1 is a diagram showing a hydraulic circuit in a disc brake device according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] The following description will discuss embodiments of the present invention with reference to the accompanying drawings. In the drawings used in the following description, the same or similar parts are designated by the same reference numerals, and redundant explanations may be omitted. In some drawings, unnecessary reference numerals may be omitted. ===Example=== 2A and 2B show the external appearance of a disc brake device 1 according to an embodiment. In FIG. 2A, the brake disc 2 is shown in a transparent state with a dotted line to make it easier to understand the structure of the disc brake device 1. As shown in FIGS. 2A and 2B, the disc brake device 1 is configured by attaching various members that constitute the brake disc device 1 to a rectangular flat base (hereinafter sometimes referred to as a "base plate 3").

[0016] Here, the horizontal plane is defined as a plane that includes the front-rear, left-right, and up-down directions of the disc brake device 1, and the front-rear, left-right, and up-down directions are defined as being in a state where the base plate 3 is placed on the horizontal plane. The rotation axis 100 of the brake disc 2 extends in the left-right direction. The front-rear directions are defined as being in front of the base plate 3. The vertically upward direction when the base plate 3 is placed on the horizontal plane is defined as the upward direction of the disc brake device, and the left-right directions are defined according to the left and right directions when viewed from the front to the rear. Therefore, Figures 2A and 2B are perspective views of the disc brake device 1 as viewed from the upper left front and right rear, respectively.

[0017] Plates (4L, 4R) having a frame shape with straight sides, i.e., a "C" shape (hereinafter sometimes referred to as a "C-shape"), are fixed to the left and right of the base plate 3 in a facing relationship. A rectangular flat plate that serves as the top plate 5 is fixed to and suspended from the upper end surfaces of the left and right plates (hereinafter sometimes referred to as "side plates 4L and 4R"). A total of four rod-shaped members (hereinafter sometimes referred to as "support pins 41") extending left and right are suspended from the front and rear of the upper and lower ends of the two side plates (4L, 4R), and the left and right ends of each support pin 41 are fixed to the left side plate 4L and the right side plate 4R, respectively.

[0018] Furthermore, plates 7 (hereinafter sometimes referred to as "support plates 7") made by bending a flat metal plate and formed in a C-shape with an open front when viewed from above are attached to the left and right side plates (4L, 4R) via spacer members 71 made of metal blocks. The base plate 3, the two side plates (4L, 4R), the top plate 5, the support pins 41, and the support plates 7 form a frame that corresponds to the housing of the disc brake device 1.

[0019] Between the two side plates (4L, 4R) are disposed left and right rectangular flat plates (hereinafter referred to as "slide plates 6L and 6R") that face each other. The slide plates (6L, 6R) are C-shaped with an open rear, and the straight portions of the C extending up and down and from the front to the rear are wider than the side plates (4L, 4R). Two metal blocks (61L, 61R) that are wider in the front-to-rear direction and C-shaped when viewed from the front-to-rear direction are fixed to the open ends of the C shape of each of the left and right slide plates (6L, 6R) so that the open ends of the C shape face each other in the left-to-right direction.

[0020] 3A and 3B show a front view of the disc brake device 1 as seen from the front and a rear view as seen from the rear. In FIGS. 3A and 3B, the brake disc 2 is indicated by a dotted line. In FIG. 3A, the slide plates (6L, 6R) are shown in cross section cut along a plane including the up-down and left-right directions. In FIG. 3B, a portion of the rear surface of the support plate 7 is omitted.

[0021] The configuration and structure of the disc brake device 1 will be described in more detail below. As shown in FIG. 3A , the two slide plates (6L, 6R) are formed with holes (hereinafter sometimes referred to as “guide holes 62”) through which the support pins 41 are slidably inserted. The two slide plates (6L, 6R) are guided by the support pins 41 inserted through the guide holes 62 and move in parallel in the left-right direction so as to move toward and away from each other. Brake linings (8L, 8R) are attached to the inner surfaces of the opposing sides of the two slide plates (6L, 6R) via brake shoes 81. The brake disc 2 is disposed between the brake linings (8L, 8R) facing each other on the left and right. When the two slide plates (6L, 6R) move toward each other and the brake linings (8L, 8R) clamp the brake disc 2, the disc brake device 1 enters a braking state. When the two slide plates (6L, 6R) move away from each other, the braking state is released.

[0022] In the disc brake device 1 according to the embodiment, the mechanism for biasing the two slide plates (6L, 6R) in a direction to bring them closer to each other is a spring mechanism 20 mainly composed of a spring 21. The spring mechanism 20 has a rod 22 that has its right end outside the right frame of the right side plate 4R and extends in the left-right direction, and a spring 21 wound around the rod 22. As shown in FIG. 3A , the rod 22 is slidably inserted into a through-hole 63 formed in the right slide plate 6R, and its left end is fixed to the left slide plate 6L. The spring 21 is disposed between a spring seat 23 fixed to the right end of the rod 22 and the right slide plate 6R.

[0023] In the spring mechanism 20 having the above configuration, the elastic force of the spring 21 compressed between the spring seat 23 and the right slide plate 6R is evenly distributed, through action and reaction, between a force that directly urges the right slide plate 6R leftward and a force that urges the left slide plate 6L, which is fixed to the left end of the rod 22, rightward via the spring seat 23. As a result, when no force is acting to separate the two slide plates (6L, 6R) from each other, the left and right slide plates are urged equally toward each other, and the left and right brake linings (8L, 8R) are pressed against the surfaces of the brake disc 2, thereby establishing a braking state. If the spring 21 is in a sufficiently compressed state when no force is acting to separate the two slide plates (6L, 6R) from each other, sufficient braking force is ensured even if the brake linings (8L, 8R) have worn and become thin.

[0024] On the other hand, the hydraulic cylinder 30 is the driving source for moving the two slide plates (6L, 6R) away from each other to release the braking state. The hydraulic cylinder 30 is incorporated into a housing 31, which is fixed to the rear side of the rear surface 72 of the support plate 7. Figure 4 shows the fixing structure of the hydraulic cylinder 30 in the disc brake device 1. Note that in Figure 4, a portion of the rear side of the support plate 7 is cut away to make the fixing structure easier to understand. The hydraulic cylinder 30 in the embodiment is of what is called an "opposed piston type" or "double rod type." In Figures 3B and 4, the hydraulic cylinder 30 built into the housing 31 is shown by dotted lines. As shown in Figure 3B, the hydraulic cylinder 30 has two pistons (33L, 33R) that move symmetrically in opposite directions in a single cylinder tube 32 having a cylindrical axis 101 in the left-right direction. Piston rods (34L, 34R) are connected to the left and right pistons (33L, 33R), respectively, and the tip ends of the piston rods (34L, 34R) protrude outward from the cylinder tube 32 and are exposed outside the housing 31.

[0025] As described above, the left and right slide plates (6L, 6R) are fixed with C-shaped metal blocks (61L, 61R) when viewed from the front-to-rear direction, and the tip of the left piston rod 34L is fixed to the surface of the left metal block 61L that is the back side of the left surface 64L. Similarly, the tip of the right piston rod 34R is fixed to the surface of the right metal block 61R that is the back side of the right surface 64R.

[0026] 5A and 5B are diagrams for explaining an outline of the operation of the disc brake device 1. FIG. 5A shows the operation of the hydraulic cylinder 30 when the disc brake device 1 is in a braking state, and FIG. 5B shows the operation of the hydraulic cylinder 30 when the disc brake device 1 is in a released state. As shown in FIG. 5A, when hydraulic oil is not filled in the cylinder tube 32, the elastic force of the spring 21 in the spring mechanism 20 brings the left and right slide plates (6L, 6R) close to each other, and the brake disc 2 is sandwiched between the left and right brake linings (8L, 8R), resulting in a braked state. On the other hand, when braking is released, as shown in FIG. 5B, when hydraulic oil 35 is filled in the space between the left and right pistons (33L, 33R) in the cylinder tube 32, the hydraulic pressure of the hydraulic oil presses the left and right pistons (33L, 33R) apart from each other. As a result, the left and right piston rods (34L, 34R) connected to the left and right pistons (33L, 33R), respectively, separate the left and right slide plates (6L, 6R) from each other via the left and right C-shaped metal blocks (61L, 61R), and the left and right brake linings (8L, 8R) and the brake disc 2 are separated from each other, releasing the braking state.

[0027] As described above, the disc brake device 1 releases or maintains the braking state by supplying hydraulic oil to the cylinder tube 32 of the hydraulic cylinder 30 and discharging the hydraulic oil from the cylinder tube 32. The disc brake device 1 is equipped with a hydraulic circuit for supplying and discharging hydraulic oil to and from the cylinder tube 32. FIG. 6 shows the basic configuration of the hydraulic circuit 9 equipped with the disc brake device 1 according to the embodiment. As shown in FIG. 6, the hydraulic circuit 9 includes a hydraulic oil flow path 91 formed by piping, a manifold block, etc., a reservoir 92 for storing hydraulic oil, a pump 93, various valves (94-96) disposed at appropriate locations in the flow path, and control circuits (not shown) for the pump 93 and solenoid valve 95. The hydraulic cylinder 30 is a single-acting type and has one port 36 that serves as an inlet and outlet for hydraulic oil to and from the cylinder tube 32.

[0028] In the hydraulic circuit 9 shown in FIG. 5, when power is supplied to the control circuit via a power switch or the like, the motor 97 that drives the pump 93 operates and the solenoid valve 61 closes. Hydraulic oil discharged from the pump 93 passes through a check valve 94 and is supplied from the port 36 of the hydraulic cylinder 30 into the cylinder tube 32. This pushes the left and right pistons (33L, 33R) left and right, respectively, and the left and right slide plates (6L, 6R) move away from each other. In FIG. 5, the solid arrows indicate the path of the hydraulic oil that pushes the pistons (33L, 33R). When the hydraulic pressure in the cylinder tube 32 exceeds a predetermined pressure, the relief valve 96 opens, and some of the hydraulic oil in the cylinder tube 32 is returned to the reservoir 92 via the path indicated by the hatched arrows in the figure, adjusting the hydraulic pressure in the cylinder tube 32 to a predetermined level.

[0029] On the other hand, when power is cut off to the energized control circuit, the valve mechanism of the solenoid valve 95 opens, and as shown by the white arrow in the figure, the hydraulic oil in the cylinder tube 32 is discharged toward the reservoir 92 via the flow path 91 that passes through the solenoid valve 95. As a result, the left and right pistons (33L, 33R) are pushed back in the directions in which they approach each other by the biasing force of the spring mechanism 20, which tries to bring the left and right slide plates (6L, 6R) closer to each other.

[0030] As described above, in the disc brake device 1 according to the embodiment, the spring mechanism 20 for applying the brake and the hydraulic cylinder 30 for releasing the brake are each configured to directly move the left and right slide plates (6L, 6R) without using a link mechanism. As described above, the elastic force of the spring 21 from the spring mechanism 20 acts equally on the two slide plates (6L, 6R), and because the hydraulic cylinder 30 is an opposed-piston type, the hydraulic pressure in the cylinder tube 32 is transmitted equally to the two pistons (33L, 33R). In other words, in the applied state, the left and right brake linings (8L, 8R) are pressed equally against the brake disc 2, and in the released state, the distances between the brake disc 2 and the left and right brake linings (8L, 8R) are equal. Furthermore, the disc brake device 1 according to the embodiment has a simple structure without a link mechanism, which facilitates maintenance and inspection, reduces malfunctions, and ensures high reliability. Of course, in the disc brake device 1 according to the embodiment, a link mechanism for moving the left and right slide plates (6L, 6R) is not required, and therefore the operating range of one of the spring mechanism 20 and the hydraulic cylinder 30 is not limited by the operating range of the other. ===Other Examples=== Although the disc brake device according to the embodiment has been described above, it goes without saying that the present invention is not limited to the above embodiment and can be modified in various ways without departing from the spirit of the present invention. The above embodiment has been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to a device that includes all of the described configurations. Furthermore, it is possible to add, delete, or replace some of the configurations of the above embodiment with other configurations.

[0031] For example, although two spring mechanisms 20 are provided in the embodiment, one may be provided. Note that in a disc brake device 1 provided with a plurality of spring mechanisms 20, the pressing positions on the slide plates (6L, 6R) can be dispersed, and the slide plates (6L, 6R) can be moved in the left-right direction more stably. On the other hand, in a disc brake device 1 provided with one spring mechanism 20, the number of parts can be reduced. In any case, the number of spring mechanisms 20 may be set appropriately in consideration of manufacturing costs and operational stability.

[0032] Furthermore, although in the embodiment, both of the two spring mechanisms 20 are provided so as to protrude to the right, one may be provided on each of the left and right sides. Of course, both of the two spring mechanisms 20 may also be provided so as to protrude to the left. Note that while providing the spring mechanisms 20 on both the left and right sides increases the size of the disc brake device 1 in the left-right direction, it is less likely that the left-right weight balance will be unbalanced, allowing the disc brake device 1 to be installed more stably. In any case, the installation mode of the spring mechanisms 20 may be set appropriately depending on the installation space for the disc brake device 1, the fixing strength of the base plate 3 at the installation position, and the like.

[0033] The spring mechanism 20 in the embodiment is structured to simultaneously move the left and right slide plates (6L, 6R) using a spring 21 and a rod 22, but it may also be structured so that the left and right slide plates (6L, 6R) are pressed by individual springs 21 by interposing a spring 21 between the left slide plate 6L and the left side plate 4L, and between the right slide plate 6R and the right side plate 4R.

[0034] The frame that serves as the housing of the disc brake device 1 itself is primarily composed of plate-like members (4L, 4R, 5) fixed on the base plate 3. Of course, as long as the brake disc 2 can be sandwiched between the brake linings (8L, 8R), it may be box-shaped with a minimum number of openings. In the disc brake device 1 according to the embodiment, the spring mechanism 20 is attached within the C-shaped frame of the C-shaped side plates (4L, 4R), and the slide plates (6L, 6R) are exposed within the C-shaped frame of the side plates (4L, 4R). This structure allows heat transferred to the slide plates (6L, 6R) via the brake linings (8L, 8R) during braking to directly contact the air, further reducing the likelihood of a decrease in frictional force due to heat. Furthermore, because the spring mechanism 20 is exposed to the outside, replacement and maintenance of the spring mechanism 20 is easy.

[0035] The hydraulic circuit 9 shown in FIG. 6 is an example of a basic configuration for operating the hydraulic cylinder 30, and naturally, the hydraulic circuit 9 is not limited to the configuration shown in FIG. 6 as long as it can cause hydraulic oil to flow in and out of the cylinder tube 32 of the hydraulic cylinder 30. [Explanation of symbols]

[0036] 1. Disc brake device according to an embodiment, 2. Brake disc, 3. Base plate, 4L, 4R side plates, 5 top plate, 6L, 6R slide plates, 7 support plate, 8L, 8R brake lining, 9 hydraulic circuit, 10 conventional disc brake device, 20 spring mechanism, 21 spring, 22 rod, 23 spring seat, 30 hydraulic cylinder, 31 hydraulic cylinder housing, 32 cylinder tube, 33L, 33R piston, 34L, 34R Piston rod, 100 Brake disc rotation axis, 101 Hydraulic cylinder shaft

Claims

1. A disc brake device that applies a brake to rotation of a brake disc having a rotation axis in the left-right direction by sandwiching the brake disc between left and right brake linings that face each other in the left-right direction, a left slide plate to which the left brake lining is attached and which is movable in parallel in the left-right direction; a right slide plate to which the right brake lining is attached and which faces the left slide plate and is movable in parallel in the left-right direction; a spring mechanism that biases the left and right slide plates in a direction that brings them closer to each other; a hydraulic cylinder that biases the left and right slide plates in directions that move them apart from each other; Equipped with The hydraulic cylinder is an opposed piston type having left and right pistons that move symmetrically in the left-right direction relative to one cylinder tube having a cylinder axis in the left-right direction, the left and right pistons are connected to the left and right slide plates, respectively; When hydraulic oil is filled into the cylinder tube, the left and right slide plates move in directions away from each other, and the brake is released. When the hydraulic oil in the cylinder tube is discharged, the left and right slide plates move closer to each other, and the brake disc is sandwiched between the left and right brake linings, thereby achieving a braking state. Disc brake device.

2. The spring mechanism includes: a rod whose tip is fixed to one of the left and right slide plates and slidably penetrates and protrudes outward from the other of the left and right slide plates; a spring compressed between the base end of the rod and the other of the left and right slide plates; The disc brake device according to claim 1, comprising:

3. The disc brake device according to claim 2, wherein a plurality of the spring mechanisms are provided.

4. the slide plate is disposed between two side plates fixed on a base and facing each other in the left-right direction; The side plate is a C-shaped frame that opens in either the front or rear direction, The slide plate is exposed on the inside of the C-shaped frame of the side plate. The disc brake device according to any one of claims 1 to 3.

Images