JP3028391U - Caliper assembly for disc brake device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] A caliper assembly of a disc brake device capable of uniformly contacting a surface of a friction pad with a disc to enhance a braking force, preventing one-side wear of the friction pad and extending its service life. Providing a solid. A caliper base (104), a pair of caliper arms (106, 108) pivotally coupled to the caliper base to rotate between a braking position and a release position, and a caliper arm rotatably installed and restricted. And the pad holders 112 and 114 that tilt in the angular range and are fixedly held by the pad holder, frictionally contact the rotating disk as the caliper arm rotates to the braking position, and move as the caliper arm rotates to the release position. The friction pads 120, 122 that disengage from the rotating disk, means 126, 128 for elastically biasing the pair of caliper arms toward each other toward the braking position, and the pair of caliper arms toward the release position. And means 134 for expanding in a direction away from each other.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake device, and more particularly to a caliper assembly of a disc brake device configured to press a disc mounted on a traveling motor shaft of a forklift truck on both sides to perform braking.

[0002]

[Prior art]

 As is well known, forklifts are used for loading and unloading various loads or transporting from one place to another using a fork that can move up and down along a mast. It has excellent properties. Like other types of industrial vehicles or heavy vehicles, forklifts travel at a relatively low speed because they travel depending on the torque of the motor, and the average mileage is also much shorter than that of ordinary vehicles. For this reason, forklift drivers almost always stand up and operate the steering wheel, joystick, accelerator pedal, brake pedal, etc. while standing on the forklift.

An ordinary forklift truck is equipped with a brake device that presses a brake disc mounted on an output shaft of a motor with its both side surfaces to perform braking. As such a brake device, a braking force is increased as a driver steps on a brake pedal. A so-called "Dead Man" type braking device in which a braking force is applied when the brake pedal is released and the foot is released from the brake pedal is generally used. As shown in FIG. 6, the dead-man type brake device includes a disc 12 fixed to an output shaft of an electric or hydraulically actuated traction motor 10 and rotating with the output shaft, and a disc 12 installed around the disc 12. And a caliper assembly 14 that applies a braking force.

The caliper assembly 14 has a mounting bracket 16 fixed to a frame (not shown) of a forklift, and a pair of caliper arms 18 and 20 are attached to one end of the mounting bracket 16 by a pivot pin 22. The operation cam 24 is rotatably hinge-coupled, and the actuating cam 24 is rotatably installed on the other end around a cam shaft 26. The actuating cam 24 is rotated to spread the caliper arms 18 and 20 to the brake release position. The actuating cam 24 is connected to a brake pedal (not shown) via an actuating arm.

The caliper arms 18 and 20 extend substantially parallel to each other from both sides of the disk 12 with an appropriate distance. Gap adjusting bolts 28 and 30 are screwed to the free ends of the caliper arms 18 and 20 so as to face each other with the actuating cam 24 interposed therebetween, and the gap between the caliper arms 18 and 20 and the disk 12 can be adjusted. The gap adjusting bolts 28 and 30 are held by locking hooks 32 and 34 which are detachably attached to the end surfaces of the caliper arms 18 and 20 so as not to be loosened or tightened accidentally. Through holes 18a and 20a are formed near the free ends of the caliper arms 18 and 20, and a tie rod 36 is inserted into these through holes 18a and 20a. The tie rod 36 has a projecting extension 36a that extends long through the caliper arm 18 on one side and is partially formed with a male screw. The projecting extension 36a has a large-diameter compression coil spring 38. And a small-diameter compression coil spring 40 is concentrically mounted so as to urge the free ends of both caliper arms 18, 20 toward each other, that is, in the braking position.

Further, pad assemblies 42, 44 including holding blocks 46, 48 and friction pads 50, 52 are attached and detached by bolts 54, 56 between the free ends and the base ends of the caliper arms 18, 20. Mounted as possible. Since the friction pads 50 and 52 face each other with the disc 12 interposed therebetween, when the caliper arms 18 and 20 are approaching by the urging force of the compression coil springs 38 and 40, the both sides of the disc 12 are pressed to the disc 12. When a braking force is applied and the caliper arms 18 and 20 are spread by the action of the actuating cam 24, the caliper arms 18 and 20 are separated from both side surfaces of the disk 12 to release the braking force.

[0007]

In the conventional braking device as described above, the friction pads 50 and 52 need to be replaced with new ones according to the degree of wear thereof, and the new friction pads have a uniform thickness. Manufactured to. However, since the caliper arms 18 and 20 are configured to rotate about the pivot pin 22 at a predetermined angle to bring the friction pads 50 and 52 into contact with the disc 12, the brake device replaced with a new friction pad is used. In this case, if the caliper arms 18 and 20 and the disk 12 are not perfectly parallel to each other during braking, only a part of the surfaces of the friction pads 50 and 52 contact the disk 12 and the braking force is significantly reduced. There is a risk of In other words, some surfaces of the friction pads 50, 52 close to the pivot pin 22 come into contact with the disc 12, but the remaining surfaces do not come into contact with the disc 12, so that a certain period of time does not elapse after replacement of the friction pads. And there was a problem that a stable braking force could not be obtained. This kind of "partial contact" phenomenon appears repeatedly every braking until the newly replaced friction pad is fully worn. Further, such partial contact causes one-side wear of the friction pads 50, 52, and shortens the service life thereof.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to uniformly contact the surface of the friction pad with the disk to increase the braking force. Another object of the present invention is to provide a caliper assembly of a disc brake device which can be used and can prevent one-side wear of the friction pad and prolong its service life.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, a caliper assembly of a disc brake device according to the present invention is used for a disc brake device that applies a braking force by pressing both side surfaces of a rotating disc, and includes a caliper base and the caliper base. A pair of caliper arms pivotally connected to the base to rotate between a braking position and a release position, and a pair of caliper arms extending from the base end portion to the free end portion with the rotary disc interposed therebetween, and a pair of caliper arms. A pad holder that is movably installed and tilts within a limited angular range; and a caliper arm that is fixedly held by the pad holder and that frictionally contacts the rotating disc as the caliper arm rotates to a braking position. A friction pad that separates from the rotating disc as the caliper arm rotates to the release position and the pair of caliper arms are placed in the braking position. And means for resiliently biasing toward each other toward, characterized in that it comprises a hands stage for widening in a direction away from each other toward the releasing position caliper arm of said pair.

Each of the caliper arms has a notch formed in the width direction between a base end portion and a free end portion of the caliper arm, and the pad holder is a pad holding portion extending parallel to the caliper arm. And a protrusion protruding from the pad holder into the notch of the caliper arm.

A hinge hole is formed in the protrusion of the pad holder, a hinge hole corresponding to the hinge hole of the pad holder is formed in the caliper arm, and a hinge pin is formed in the hinge hole of the pad holder and the caliper arm. Is preferably inserted into the pad holder so as to rotatably hold the pad holder with respect to the caliper arm.

The protrusion and the hinge hole of the pad holder are formed at a position deviated to one side from the gravity center of the pad holder so that the pad holder has a rotation moment in one direction about the hinge axis. It is preferable that the caliper arm has a stop projection protruding toward the rotary disk so as to restrict the rotational movement of the pad holder due to the rotational moment.

The caliper arm has a stop projection projecting toward the rotary disk so as to hold an extension of the pad holder of the pad holder on one side, and the caliper arm holds the hinge pin to sandwich the stop. An elastic holding member is installed on the opposite side of the protrusion between the pad holder and the caliper arm.

Means for elastically urging the caliper arms toward the braking position toward each other includes a tie rod penetrating through the pair of caliper arms and a free end of each caliper arm. The compression coil spring is installed concentrically with the tie rod so as to urge the parts toward each other.

A gap adjusting bolt may be further included, which is screwed to the free end of the caliper arm to set the rotation angle of the caliper arm so as to be changeable.

The means for expanding the pair of caliper arms toward the release position in the direction in which the caliper arms are separated from each other include an operating position in which the caliper arms are expanded by pressing the gap adjustment bolts in a direction in which they are separated from each other, and the gap. It is preferably an actuating cam mounted on the caliper base for rotation between an adjusting bolt and a non-actuating position in which the pair of caliper arms are brought closer to each other.

A locking hook detachably attached to the free end of the caliper arm may be further included to prevent rotation of the gap adjusting bolt.

[0018]

[Embodiment of device]

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

As shown in FIGS. 1 to 3, the caliper assembly of the disc brake device according to the first embodiment of the present invention includes a rotary disc 102 mounted on the output shaft of the traction motor 100 and having both side surfaces. It is configured to apply a braking force by pressing. Contrary to the general passenger car, the braking force is applied to the disc 102 only when the driver releases his foot from the brake pedal.

The brake device includes a caliper base 104 mounted at an appropriate position on a frame (not shown) of a forklift, and the caliper base 104 is a first caliper base 104 that projects to the vicinity of the circumferential surface of the disk 102. It has a protrusion 104a and a second protrusion 104b. A pair of caliper arms 106 and 108 is installed on the first projecting portion 104a of the caliper base 104 so as to be rotatable around a pivot shaft 110. These caliper arms 106 and 108 rotate about a pivot shaft 110 between a braking position shown in FIG. 1 and a releasing position (not shown). In the braking position, both arms 106, 108 approach each other and are held substantially parallel to the sides of the disc 102, and in the released position both arms 106, 108 extend in a direction away from each other. An acute angle is formed with the side surface of the disk 102. Each of the caliper arms 106, 108 has a notch 106a, 108a formed in the widthwise direction in the middle thereof, and hinge holes 106b, 108b penetrating the center of the notch. Further, large-diameter screw holes 106c and 108c and small-diameter through holes 106d and 108d are formed side by side in the width direction near the free ends of the caliper arms 106 and 108.

Pad holders 112 and 114 are rotatably installed in the notches 106a and 108a of the caliper arms 106 and 108 so that they can be tilted within a limited angular range. These pad holders 112 and 114 are respectively pad holding portions 112a and 114a extending in parallel to the caliper arms 106 and 108, and substantially semicircular shapes protruding from the pad holding portions 112a and 114a to the opposite side of the disk 102. Protrusions 112b and 114b are provided. Then, as shown in FIG. 3, hinge holes 112c and 114c are formed in the protrusions 112b and 114b in the thickness direction thereof, and the hinge holes 112c and 114c and the hinge holes 106b of the caliper arms 106 and 108 are formed. Hinge pins 116 and 118 are fitted into 108b to hold the pad holders 112 and 114 rotatably with respect to the caliper arms 106 and 108, respectively.

Friction pads 120 and 122 are fixed to the pad holders 112 and 114 so as to face the disc 102. These friction pads 120, 122 make frictional contact with the disc 102 as the caliper arms 106, 108 rotate to the braking position, and separate from the disc 102 as the caliper arms 106, 108 rotate to the release position. However, since the pad holders 112 and 114 are rotatably attached to the caliper arms 106 and 108, the friction pads 120 and 122 should be parallel to the side surface of the disk 102 during braking. It is self-aligning, which allows for uniform contact between the friction pads 120, 122 and the disk 102.

As shown in FIGS. 1 and 2, a tie rod 124 is loosely fitted in the through holes 106 d and 108 d of the caliper arms 106 and 108. The tie rod 124 has a head 124 a that is locked to one caliper arm 108 and a screw end portion 124 b that passes through the other caliper arm 106 and projects long. A large-diameter compression coil spring 126 and a small-diameter compression coil spring 128 are concentrically installed on the screw end portion 124b of the tie rod 124, and the respective caliper arms 106, 108 approach each other about the pivot shaft 110. It is urged toward. In other words, the tie rod 124 and compression coil springs 126, 128 assembly always biases the caliper arms 106, 108 toward each other, thereby exerting a braking force on the disc 102 through the friction pads 120, 122. . It is necessary to set the spring constants of the compression coil springs 126 and 128 sufficiently large in order to prevent the slip between the friction pads 120 and 122 and the disk 102 during braking. .

Gap adjusting bolts 130 and 132 are screwed into the screw holes 106c and 108c of the caliper arms 106 and 108 in a facing relationship. Each of the gap adjusting bolts 130 and 132 has a gear-shaped head and a flat tip contact surface. The gap between the tip abutting surfaces of these gap adjusting bolts 130 and 132 can be adjusted by loosening or tightening them. Once the clearance between the clearance adjustment bolts 130, 132 has been adjusted to the desired value, the ends of each caliper arm 106, 108 engage the locking hooks 133, 135 with the heads of the clearance adjustment bolts 130, 132. It is preferable that the clearance adjusting bolts 130 and 132 are removably fixed to the surface of the member so that the clearance adjusting bolts 130 and 132 are not accidentally loosened or tightened during use of the brake device.

An operating cam 134 is installed on the second projecting portion 104 b of the caliper base 104 so as to be rotatable about the cam shaft 136 between an operating position and a non-operating position. A lever 138 is attached to the actuating cam 134, and the lever 138 is operatively connected to a brake pedal (not shown). The actuating cam 134 is normally held in the non-actuated position so that the gap adjusting bolts 130, 132 and the caliper arms 106, 108 come close to each other. The caliper arms 106 and 108 are widened by pressing the tip contact surfaces of the adjusting bolts 130 and 132.

Next, the operation of the caliper assembly for the disc brake device according to the first embodiment of the present invention constructed as above will be described.

When traveling the forklift, the driver stands up while depressing the brake pedal. Therefore, the lever 138 rotates to the position shown by the alternate long and short dash line in FIG. 1, and at the same time, the operating cam 134 also rotates clockwise by a predetermined angle and is placed in the operating position. In the operating position, the operating cam 134 presses the tip contact surfaces of the gap adjusting bolts 130 and 132 to rotate the caliper arms 106 and 108 to the releasing position against the elastic force of the compression coil springs 126 and 128. To move. Therefore, the friction pads 120 and 122 move away from the disk 102 and are no longer restrained.

On the contrary, when the driver releases his / her foot from the brake pedal, the lever 138 rotates together with the actuating cam 134 to the position shown by the chain line in FIG. 1, and the caliper arms 106 and 108 move to the compression coil springs 126 and 128. Placed in braking position by force. As a result, the friction pads 120, 122 come into contact with the side surface of the disk 102 and generate a braking force. At this time, since the pad holders 112 and 114 are rotatably attached to the caliper arms 106 and 108 by the hinge pins 116 and 118, the friction pads 120 and 122 are disposed between the caliper arms 106 and 108 and the disc 102. Of the disk 102 uniformly contacts the side surface of the disk 102.

FIG. 4 shows a caliper assembly of a disc brake device for a forklift according to a second embodiment of the present invention. In FIG. 4, the same parts are designated by the same reference numerals as those used in FIGS. 1 to 3, and detailed description thereof will be omitted. The feature of the second embodiment is that the protrusions 112b and 114b of the pad holders 112 and 114 and the hinge holes 112c and 114c are deviated from the gravity centers W1 and W2 of the pad holders 112a and 114a by predetermined distances S1 and S2. The caliper arms 106 and 108 are formed at positions, and stop protrusions 140 and 142 for restricting the pad holders 112 and 114 from rotating in one direction due to gravity are formed.

As shown in FIG. 4, since the protrusion 112 b of the one pad holder 112 is biased to the right side from the gravity center W 1, the pad holder 112 has a counterclockwise rotation moment about the hinge pin 116. Since the protrusion 114b of the other pad holder 114 is biased to the left side from the gravity center W2, a rotational moment in the clockwise direction about the hinge pin 118 acts on the pad holder 114. In this way, the rotational moment acting on both pad holders 112, 114 is supported by the stop projections 140, 142, whereby the respective pad holders 112, 114 are always substantially parallel to the caliper arms 106, 108. Held in. Therefore, when the caliper arms 106 and 108 are spread to the release position, the pad holders 112 and 114 tilt about the hinge pins 116 and 118 and move between the friction pads 120 and 122 and the disc 102. Prevent unwanted contact.

FIG. 5 is a view showing a caliper assembly of a disc brake device for a forklift according to a third embodiment of the present invention. In FIG. 5, the same parts as those used in FIG. 1 or FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted. According to the brake device of the third embodiment, the caliper arms 106 and 108 are provided so as to project toward the disc 102 so as to hold the one-side extension of the pad holding portions 112a and 114a of the pad holders 112 and 114. It has stop protrusions 144, 146. Further, elastic holding members 148, 150 are provided between the caliper arms 106, 108 and the extension portions on the other side of the pad holding portions 112a, 114a on the opposite side of the stop protrusions 144, 146 about the hinge pins 116, 118. Is sandwiched between. Therefore, the pad holders 112 and 114 are always urged to rotate by the elastic holding members 148 and 150 toward the stop projections 144 and 146, and can maintain a stable posture. Note that rubber, compression springs, or the like can be used as the elastic holding members 148 and 150.

[0032]

[Effect of device]

 As described above, according to the caliper assembly of the present invention, not only the friction pad can be evenly contacted with the side surface of the disk to enhance the braking force of the forklift, but also the one-sided wear of the friction pad is prevented. The effect is that the life can be extended.

[Brief description of drawings]

FIG. 1 is a front view showing a caliper assembly of a disc brake device according to an embodiment of the present invention, showing a state where a caliper arm is in a braking position.

2 is a vertical cross-sectional view taken along line II-II in FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a front view showing a caliper assembly of a disc brake device according to another embodiment of the present invention, with the caliper arm in a braking position.

FIG. 5 is a front view showing a caliper assembly of a disc brake device according to another embodiment of the present invention, with the caliper arm in a braking position.

FIG. 6 is a front view showing a conventional forklift disc brake device.

[Explanation of symbols]

 100 traveling motor 102 rotating disk 104 caliper base 104a first protrusion 104b second protrusion 106, 108 caliper arm 106a, 108a notch 106b, 108b hinge hole 106c, 108c large diameter screw hole 106d, 108d small diameter penetration Hole 110 Pivot shaft 112,114 Pad holder 112a, 114a Pad holding part 112b, 114b Projection part 112c, 114c Hinge hole 116,118 Hinge pin 120,122 Friction pad 124 Tie rod 124a Head 124b Screw end part 126,128 Compression coil spring 130, 132 Gap adjusting bolt 133,135 Locking hook 134 Actuating cam 136 Cam shaft 138 Lever 140,142,144,146 Stop projection 148,150 Elastic holding member

Claims (9)

[Scope of utility model registration request] 1. A disc brake device for applying a braking force by pressing both side surfaces of a rotary disc, wherein the caliper base is pivotally coupled to the caliper base and pivots between a braking position and a releasing position. A pair of caliper arms extending from the base end portion to the free end portion with the rotary disc interposed therebetween; a pad holder rotatably installed on the caliper arm and tilting within a limited angular range; A friction pad fixedly held by the pad holder, frictionally contacting the rotary disc as the caliper arm pivots to a braking position, and separated from the rotary disc as the caliper arm pivots to a release position; Means for elastically biasing the pair of caliper arms toward each other toward the braking position, and the pair of caliper arms And a means for expanding the two in a direction away from each other toward the release position. 2. The caliper arm has a notch formed in a width direction between a base end portion and a free end portion of the caliper arm, and the pad holder is a pad holder extending parallel to the caliper arm. The caliper assembly according to claim 1, further comprising a portion and a protrusion protruding from the pad holding portion into the notch of the caliper arm. 3. A hinge hole is formed in the protrusion of the pad holder, a hinge hole corresponding to the hinge hole of the pad holder is formed in the caliper arm, and a hinge hole is formed in the pad holder and the caliper arm. The caliper assembly according to claim 2, wherein a hinge pin is fitted in and holds the pad holder rotatably with respect to the caliper arm. 4. The protrusion and the hinge hole of the pad holder are formed at a position deviated from the gravity center of the pad holder to one side so that the pad holder has a rotational moment in one direction about the hinge axis. 4. The caliper assembly according to claim 3, wherein the caliper arm has a stop projection protruding toward the rotary disc so as to restrict the rotational movement of the pad holder due to the rotational moment. 5. The caliper arm has a stop projection protruding toward the rotary disk so as to hold an extension of the pad holder on one side of the pad holder, and the caliper arm sandwiches the hinge pin. The caliper assembly according to claim 3, wherein an elastic holding member is installed between the pad holder and the caliper arm on the side opposite to the stop protrusion. 6. The means for elastically urging the caliper arms toward the braking position toward each other includes a tie rod penetratingly fitted through the pair of caliper arms and a free of each caliper arm. The caliper assembly according to claim 3, further comprising: a compression coil spring that is installed concentrically with the tie rod so as to urge the ends toward each other. 7. The caliper set according to claim 6, further comprising a gap adjusting bolt screwed to a free end portion of the caliper arm for setting a turning angle of the caliper arm to be changeable. Three-dimensional. 8. The means for expanding the pair of caliper arms in a direction separating from each other toward a release position includes an operating position for expanding the caliper arms by pressing the gap adjusting bolts in a direction separating from each other, and the gap. 8. The caliper according to claim 7, wherein the caliper is an actuating cam installed on the caliper base so as to rotate between the adjusting bolt and the non-actuating position where the pair of caliper arms approach each other. Assembly. 9. The caliper assembly of claim 7, further comprising a locking hook removably attached to the free end of the caliper arm to prevent rotation of the clearance adjustment bolt.