JP2524514Y2 - Disc brake - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake incorporating a parking brake mechanism.

[0002]

2. Description of the Related Art Conventionally, as an example of a disc brake incorporating a parking brake mechanism, a caliper that slidably accommodates a piston pressed by the supply of brake fluid,
A cam shaft for axially displacing the piston by the rotation of the brake lever is provided, and a reaction force of a force acting on the brake lever at the time of the parking brake operation is provided. In some cases, a receiving guide member is fixed to the caliper with a bolt. For example, by pulling a hand lever and rotating a brake lever, a friction pad is pressed against a brake disk via a piston to perform a parking brake operation, and a brake pedal is operated to operate a caliper cylinder. The brake fluid is supplied to displace the piston, whereby the friction pad is pressed against the brake disc to function as a foot brake.

[0003]

Generally, in a disc brake, an opening communicating with a cylinder is provided at a portion of a caliper located behind a piston, and a hose for supplying brake fluid is connected to the opening. For example, the brake fluid is supplied into the cylinder from the master cylinder via the master cylinder, but the base of the hose is exposed. For this reason, if the vehicle turns while traveling on a jersey, stones may enter between the wheels, which may hit the base. In particular, when the speed was increased, the stones were easy to enter and easily hit, and there was a risk that the base would break due to hitting.

As another example of a disc brake,
There is a cover that covers the base portion, which is attached by screwing a dedicated bolt into a screw hole formed in the guide member, so that the base portion is protected by the cover. It is necessary to perform cover installation and bolt tightening work, which increases the number of work steps and the number of parts, and accordingly increases the cost.Therefore, it cannot be an appropriate solution to the above problem. It was the actual situation.

The present invention has been made in view of the above problems, and can prevent stones and the like from splashing on a mouth portion of a hose for supplying brake fluid without increasing the number of work steps and costs. The purpose is to provide a disc brake.

[0006]

In order to achieve the above object, a first invention is to provide a brake lever which is rotated by a parking brake operation on a caliper which slidably accommodates a piston pressed by supply of brake fluid. And a cam shaft for displacing the piston in the axial direction by the rotation of the brake lever, and a guide member receiving a reaction force of a force acting on the brake lever during the parking brake operation is fixed to the caliper by bolts. In the disc brake, a protection member for protecting a base portion of a hose for supplying a brake fluid into a cylinder of the caliper from foreign matters is fixed together with the guide member to the caliper by the bolt.

In order to achieve the above object, a second device is
The protection member is configured to cover the base of the hose.

[0008] In order to achieve the above object, a third device is as follows.
The protection member is configured so as to be located at a position on the inlet side in the rotation direction of the disk when the vehicle moves forward relative to the base of the hose. In this case, the protection member may be configured to have a projection that fits into a recess provided near the bolt insertion hole of the guide member.

[0009]

According to the first aspect of the present invention, as described above, in the case where a stone bounces while the vehicle is running and is blown toward the mouth portion of the hose, the protection member receives the stone,
It is possible to prevent the hose from hitting the mouth portion. In addition, since the protection member that prevents the raised stones from hitting the mouth part of the hose is attached to the caliper using the bolt used for the guide member installation,
In order to prevent damage to the base, it is not necessary to use a new bolt.

The second device is configured as described above.
Even if the stones come in from various directions, the protection member receives the stones and prevents them from hitting the mouth portion of the hose.

The third device is configured as described above.
The protection member receives the rock that has jumped up during the forward running of the vehicle and prevents the base from being broken. When the protection member is configured to have a convex portion that fits into a concave portion provided near the bolt insertion hole of the guide member, when the protective member is assembled to the guide member, the protective member is provided in the concave portion of the guide member. Can be carried out by fitting the convex portions of. Further, even when the protection member receives the stone and applies a rotational force to the protection member, the state in which the protrusion of the protection member is fitted into the recess of the guide member is maintained.

[0012]

1 to 6 show a first embodiment of the present invention.
It will be described based on FIG.

In the figure, a carrier 1 is fixed to a non-rotating part of the vehicle on one side of a disk 2 which rotates with the wheels of the vehicle. The carrier 1 has a pair of friction pads 3 arranged on both sides of the disk 2. 4 is slidably supported, and a caliper 6 is slidably supported by two slide pins 5.

The caliper 6 has a cylinder portion 7 for slidably storing a piston (not shown), and is formed so as to be connected to the cylinder portion 7 so as to straddle the disk 2 and the friction pads 3 and 4, and has a tip end side. A claw portion 6A bent and formed to be able to engage with the friction pad 4 and an overhang portion 8 which is bent and connected substantially at a right angle to the cylinder portion 7 are provided, and the overhang portion 8 has a thickness t. The plate-like guide member 9 is attached by a bolt 10.

In the caliper 6, a passage 7a is formed in a portion located behind the piston, one end of which communicates with the cylinder in the cylinder portion 7 and the other end of which is open to the outside.
The opening 7b has a brake fluid supply hose 11 having the other end connected to, for example, a master cylinder (not shown).
The tip side of the base 11a is abutted, and the bolt X is screwed into the passage 7a by passing a hole formed in the base 11a, whereby the base 11a is attached to the caliper 6. When the brake fluid is supplied into the cylinder portion 7 through the hose 11, the friction pad 3
Is pressed via a piston, thereby pressing the disk 2 to obtain a braking force.

Further, a cam shaft (not shown, bottom side in FIG. 1) for axially displacing the piston is rotatably provided on the caliper 6, and a substantially plate-shaped brake lever 12 is pivotally supported. Have been. The brake lever 12
The other end is connected to one end of a cable connected to the hand lever of the driver's seat, and this cable is covered by an outer cable 13 appropriately supported by the guide member 9 and guided to the hand lever. When the cable in the outer cable 13 is pulled in the direction of arrow A by the parking brake operation, the brake lever 12 is rotated, whereby the piston is displaced in the axial direction via the camshaft, and the friction pad 3 is moved to the disk 2. At the same time, the frictional pad 4 is pressed against the disk 2 by the reaction force thereof, thereby fulfilling the function of a parking brake. In this case, a pulling force acts on the brake lever 12 when the parking brake is operated, and the reaction force is received by the vehicle body via the guide member 9 and the outer cable 13.

A cover member 14 (protective member) configured to cover the base 11a as described later is fixed to the caliper 6 together with the guide member 9 by the bolt 10 together. The cover member 14 is provided in continuous connection with the mounting portion 15 so as to form a substantially U-shaped mounting portion 15 having a hole 15a into which the bolt 10 is inserted, and to cover the base 11a. It comprises a cover body 16 and a cylinder-side cover 17 provided in a substantially U-shape and connected to the cover body 16 so that the end reaches the opening 7b. Mounting part 15
Locking portions 18 are provided on both sides of the end of the guide member 9 so as to extend around the back surface of the guide member 9.
8 sandwiches the guide member 9 to form the cover member 14.
Are locked to the guide member 9 for positioning.

In FIG. 2, reference numeral 6a denotes a rotation preventing portion provided on both sides of the base 11a so as to protrude from the caliper 6, and serves to stop the rotation of the base 11a. Also,
In FIG. 4, reference numeral 9a denotes a concave portion formed in the guide member 9 and formed near the hole 9b into which the bolt 10 is inserted.

In the disk brake constructed as described above, even if the stones or the like jump up from various directions during the running of the vehicle, the cover member 14 blocks them, so that the cover member 14 hits the base 11a of the hose 11. Can be prevented. This can prevent the base 11a from being broken. Since the cover member 14 is attached to the projecting portion 8 of the caliper 6 by bolting together with the bolt 10 used for attaching the guide member 9, no new bolt is required to prevent damage to the base 11 a. Therefore, the cost does not increase. Furthermore, since the cover member 14 is attached with the bolt 10, it is not necessary to newly perform a bolt tightening operation, so that there is no increase in cost.

In this embodiment, an example is described in which the mounting portion 15 is provided with the locking portion 18 which is bent so as to go around the back side of the guide member 9. As shown in FIG. 6, the attachment portion 15 may be provided with a locking portion 20 formed by contacting the guide member 9 and bending the guide member 9 so as to sandwich the guide member 9 from the side. .

Next, a disc brake according to a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, an example is given in which the disc brake is mounted on the right wheel in the forward direction of the vehicle and positioned on the rear side of the wheel. In FIG. 8, the left side is the forward direction of the vehicle. Therefore, according to the rotation direction of the disk 2, that is, the wheel, the protection plate 20 and the base 11a are arranged in this order.

The second embodiment differs from the first embodiment in that a protection plate (protection member) 20 is provided instead of the guide member 9 of the first embodiment. Other members are the same as those of the first embodiment, and the same members are denoted by the same reference numerals, and description thereof will be omitted.

The protection plate 20 is made of a plate material having a thickness of 2 to 3 mm, and has a substantially trapezoidal mounting portion 21, and a lower side and an upper side of the mounting portion 21, which stand upright toward one surface 21 a, respectively. A schematic configuration includes first and second shielding portions 22 and 23 formed, and a guide portion 24 formed by bending at one side of the mounting portion 21 toward the other surface 21b. Have been. In this case, the length m of the bent portion of the guide portion 24 is set longer than the protruding length n of the convex portion 26 described later. The mounting portion 21 has a hole 25 into which the bolt 10 is inserted.
5 is arranged on the guide member 9 so as to correspond to the hole 9b of the guide member 9 as shown in FIGS. By arranging the protection plate 20 on the guide member 9 in this manner, the first and second shielding portions 2 of the protection plate 20 are provided.
The bases 2 and 23 are located on the inlet side in the rotation direction F of the disc 2 when the vehicle advances, with respect to the base 11a of the hose 11, and are configured to substantially form a wall with respect to the base 11a. Further, a portion corresponding to the concave portion 9a of the guide member 9 on the other surface 21b of the mounting portion 21 is provided with a concave portion 9a.
Is formed by plastic deformation.
The protective plate 20 configured as described above is fixed together with the guide member 9 by bolts 10 together with the guide plate 9 in the state of being arranged on the guide member 9 as described above. The guide portion 24 of the protection plate 20 is substantially in contact with the side surface 9 c of the guide member 9 when the protection plate 20 is disposed on the guide member 9.

The recess 9a of the guide member 9 is formed by plastic deformation by press working, and a projection 9d is formed by the plastic deformation by press work. The projection 9 d fits into a hole 8 a formed in the projecting portion 8 of the caliper 6 and performs a function of preventing the guide member 9 from rotating. That is, the guide member 9 is fixed by the bolt 10, but the guide member 9 may rotate with the single bolt 10. On the other hand, the projection 9d has the hole 8a.
To prevent the guide member 9 from rotating.

In the disk brake configured as described above, the vehicle turns and jumps up the stones S while traveling forward on a sloping road by increasing the speed.
If you follow the path shown in
The first or second shielding portions 22 and 23 receive the stone S. Thus, it is possible to prevent the stone S from hitting the base 11a. Since the protection plate 20 provided with the first or second shielding portions 22 and 23 is attached to the overhang portion 8 of the caliper 6 by bolting together with the bolt 10 used for attaching the guide member 9, the base portion 11a is damaged. In order to prevent the above problem, it is not necessary to use a new bolt, and the cost is not increased. Furthermore, since the protection plate 20 is attached with the bolt 10, it is not necessary to newly perform a bolt tightening operation, so that there is no increase in cost.

When the first or second shielding portions 22 and 23 receive the stone S, a rotational force acts on the protection plate 20 as a reaction force.
a, and the guide portion 24 of the protection plate 20 is
The guide plate 9 is locked to the side surface 9c, so that the protection plate 20 is prevented from rotating. The protection plate 2 is formed by both the convex portion 26 and the guide portion 24.
Since the rotation is stopped at 0, the rotation can be more reliably achieved and safety can be improved.

When assembling the protection plate 20 to the projecting portion 8 of the caliper 6 with the guide member 9 interposed therebetween, the guide portion 24 comes into contact with the side surface portion 9c of the guide member 9 while the convex portion 26 forms the concave portion of the guide member 9. The guide member 9 is securely positioned with respect to the protection plate 20. Since the guide portion 24 is formed by bending as described above, the positioning cannot be performed with high accuracy using only the guide portion 24. In the present embodiment, not only the guide portion 24 but also the convex portion 26 has a positioning function. Therefore, both can be positioned with high accuracy. In particular, when assembling the protective plate 20 by an automatic machine and tightening the bolts, the guide plate 24 comes into contact with the side surface 9c of the guide member 9 at the time of assembling in order to perform positioning with high accuracy. It is desirable to provide something. In this regard, in the present embodiment, the length of the bent portion of the guide portion 24 is set to be longer than the protruding length n of the convex portion 26 so that the positioning by the guide portion 24 can be performed more reliably.

As apparent from FIG. 7, the protection plate 20
Is rotated by 180 °, there is a risk that the convex portion 26 may be disengaged from the side surface of the guide member 9 and may be erroneously assembled. As a result, erroneous assembly can be prevented.

In the second embodiment, the case where the protection plate 20 is provided with the first and second shielding portions 22 and 23 so as to receive the stone S more securely is described as an example. However, the present invention is not limited to this, and one of the first and second shielding portions 22 and 23 may be provided on the protection plate 20.

[0030]

According to the first aspect of the present invention, since the protection member receives the stones that have jumped up while the vehicle is running and prevents them from hitting the base of the hose, it is possible to prevent the bases from being broken by the stones that have jumped up. . In addition, since the protection member is mounted on the caliper also as the bolt used for mounting the guide member, it is not necessary to use a new bolt, so that the number of parts and the number of steps are not increased, and the cost is increased accordingly. Nothing.

According to the second aspect of the present invention, since the protection plate can receive the stone even if it jumps up from various directions, it is possible to surely prevent the die from being broken due to the collision of the stone irrespective of the jumping state of the stone. In addition, as in the first invention, the protection member is attached to the caliper also as the bolt used for attaching the guide member, and it is not necessary to use a new bolt, so that the number of parts and the number of working steps are not increased. Therefore, the cost does not increase.

According to the third aspect of the present invention, it is possible to prevent the rocking portion of the protection plate from receiving the stones that have jumped up while the vehicle is traveling forward and hitting the mouth portion of the hose, thereby preventing breakage of the mouth portion by the stones. In this case, similarly to the first invention, the protective member is attached to the caliper also as the bolt used for attaching the guide member, so that it is not necessary to newly use a bolt.
The number of parts and the number of man-hours do not increase, and the cost does not increase accordingly. When the protection plate is assembled to the guide member, the protection plate can be reliably positioned with respect to the guide member by fitting the protection plate to the projection of the protection member. Also, when the protection member receives the stone and a rotational force acts on the protection member, the protection member is rotated because the projection of the protection member is fitted into the recess of the guide member. Is suppressed.

[Brief description of the drawings]

FIG. 1 is a plan view showing a disc brake according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view showing a cover member of the disc brake.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 1;

FIG. 5 is a sectional view taken along line VV of FIG. 1;

FIG. 6 is a sectional view showing another locking portion formed on a cover member of the disc brake.

FIG. 7 is a plan view showing a disc brake according to a second embodiment of the present invention;

FIG. 8 is a side view schematically showing an attached state of the disc brake.

9 is a sectional view taken along line IX-IX of FIG. 7;

FIG. 10 is a sectional view taken along the line XX of FIG. 7;

FIG. 11 is a perspective view showing a protection plate used for the disc brake.

FIG. 12 is a view taken along line XII of FIG. 11;

[Explanation of symbols]

 Reference Signs List 6 Caliper 9 Guide member 9a Recess 9b Bolt insertion hole 10 Bolt 11 Hose 11a Base 12 Brake lever 20 Protective plate 22 First cut-off portion 23 Second cut-off portion 26 Convex portion

Claims (4)

(57) [Scope of request for utility model registration] A caliper, which slidably accommodates a piston pressed by the supply of brake fluid, has a brake lever that rotates by a parking brake operation and a cam that displaces the piston in the axial direction by the rotation of the brake lever. A shaft, and a guide member receiving a reaction force of a force acting on the brake lever at the time of operating the parking brake is fixed to the caliper with a bolt, and a hose for supplying brake fluid into a cylinder of the caliper is provided. A disc brake, wherein a protection member for protecting a base portion from a foreign substance is fixed together with the guide member to the caliper by the bolt. 2. The disk brake according to claim 1, wherein the protection member covers a mouth portion of the hose. 3. The disc brake according to claim 1, wherein the protection member is located at a position closer to a rotation direction entrance of the disc when the vehicle advances than a mouthpiece of the hose. 4. The disc brake according to claim 3, wherein the protection member has a convex portion that fits into a concave portion provided near the bolt insertion hole of the guide member.