JP2002168275A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability in assembling work by providing a reinforced rib in which the rib protects a pin-side installing portion from falling toward an inner periphery side when installing protecting boots. SOLUTION: The protecting boot 11 comprises bellows portion 12, a guide- hole side installing portion 13, a connecting portion 14, a pin-side installing portion 15, and each reinforced rib 16. The installing portions 13 and 15 are fitted into boot installing grooves 5 and 7 of an installing member 1 and a sliding pin 6, respectively. The each reinforced rib 16 is arranged in a peripheral direction at certain intervals. During assembling work of the protecting boot 11, the ribs protect the pin-side installing portion 15 from falling toward the inner periphery side of the connecting portion 14 by means of friction resistance with a guide chamfer portion 6c of the sliding pin 6. Consequently, assembling work of the protecting boot can be effectively performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake suitably used for applying a braking force to, for example, a vehicle or the like.

[0002]

2. Description of the Related Art Generally, a disc brake includes a mounting member mounted on a non-rotating portion of a vehicle, a caliper disposed so as to be displaceable in the axial direction of the disk with respect to the mounting member, and pressing a friction pad against the disk. A pin guide hole provided in one of the mounting member and the caliper and extending in the axial direction of the disc; and a pin guide hole provided in the other member of the mounting member and the caliper and inserted into the pin guide hole. A sliding pin that slidably supports the caliper; and a cylindrical protective boot that protects a sliding surface between the pin guide hole and the sliding pin.

A conventional disk brake of this type will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a mounting member which is integrally mounted on a non-rotating portion of a vehicle. The arm 1A has a pair of arms 1A, 1A extending in the direction.
It is configured to guide in the 0 axis direction.

[0005] A caliper 2 is slidably supported by the mounting member 1 via a slide pin 6 described later.
A bridge portion 2A extending between the arms 1A of the mounting member 1 so as to straddle the outer peripheral side of the disk 10, and an inner side provided on the inner side of the bridge portion 2A and having a cylinder bore (not shown) on the inner peripheral side. It is composed of a leg 2B and an outer leg 2C provided on the outer side of the bridge 2A. Further, pin mounting portions 2D, 2D to which the sliding pins 6 are mounted are provided on the inner leg portion 2B so as to project leftward and rightward in FIG.

Reference numerals 3 and 3 denote a pair of friction pads located on both sides of the disk 10 and provided between the arms 1A of the mounting member 1, respectively. The disk 10 is guided so as to be slidable in the axial direction of the disk 10 and pressed against both surfaces of the disk 10 by the caliper 2.

[0007] Reference numerals 4 and 4 denote a pair of pin guide holes provided in each arm portion 1A of the mounting member 1, and each pin guide hole 4 is a bottomed circular hole extending along the axial direction of the disk 10. Is formed. A sliding pin 6 is slidably inserted into the pin guide hole 4 to guide the sliding pin 6 in the axial direction.

Reference numeral 5 denotes a first boot mounting groove provided in the arm portion 1A of the mounting member 1, and the first boot mounting groove 5
As shown in FIG. 3, the pin guide hole 4 is formed as an entire circumferential groove surrounding the pin guide hole 4 from the outside, and a guide hole side mounting portion 9B of the protective boot 9 described later is fitted therein. Has become.

Reference numerals 6 and 6 denote a pair of sliding pins provided on a pin mounting portion 2D for supporting the caliper 2 so as to be displaceable. Each of the sliding pins 6 is formed in a cylindrical shape having a substantially constant outer diameter. One end of the pin shaft 6A is slidably inserted into the pin guide hole 4 of the mounting member 1, and the other end of the pin shaft 6A projects from the pin guide hole 4. .

On the protruding end side of the pin shaft 6A, an annular protrusion 6B protruding radially outward, and a pin shaft 6A
Is formed so as to expand in a tapered shape from the outer peripheral surface of the protective boot 9 to the outer peripheral surface of the annular projection 6B.
A guide surface portion 6C for guiding the pin side mounting portion 9D to the boot mounting groove 7 side, and a caliper fixing portion 6D integrally formed in a hexagonal shape on the other end side of the annular projection portion 6B are provided. I have.

Further, on the outer periphery of the protruding end of the pin shaft 6A,
A second boot mounting groove 7 is provided between the annular projection 6B and the caliper fixing portion 6D. In each sliding pin 6, the caliper fixing portion 6D is fixed to the pin mounting portion 2D of the caliper 2 by pin bolts 8,8.

Reference numerals 9 and 9 denote protective boots formed as bellows-like cylinders made of an elastic material such as rubber. The protective boots 9 surround the sliding pins 6 from outside as shown in FIG. It is arranged to protect the sliding surface between each pin guide hole 4 of the mounting member 1 and the sliding pin 6 from external dust, rainwater, and the like.

The protective boot 9 is provided on a cylindrical bellows portion 9A which can be extended and contracted in the axial direction, and is provided at one end of the bellows portion 9A, and is fitted into the boot mounting groove 7 of the mounting member 1. It includes a guide hole side mounting portion 9B and a pin side mounting portion 9D which is provided on the other end side of the bellows portion 9A via a connection portion 9C and is fitted in the boot mounting groove 7 of the sliding pin 6 with a tight allowance. It is composed of

Reference numeral 10 denotes a disk which rotates together with the wheels. The disk 10 receives a braking force from each friction pad 3 when a disk brake is operated.

In the conventional disk brake constructed as described above, the brake fluid pressure is supplied from the outside into the inner leg portion 2B (cylinder bore) of the caliper 2, so that the piston ( (Not shown) slides and presses the inner friction pad 3 toward the disk 10.

At this time, the caliper 2 receives a reaction force in a direction away from the inner side of the disk 10 and the sliding pin 6 slides in the pin guide hole 4 of the mounting member 1, so that the caliper 2 is moved to the outer side. Is pressed against the disk 10. As a result, the braking force is applied to the disk 10 from both sides by the friction pads 3.

On the other hand, the assembling work of the protection boot 9 will be described with reference to FIG. 14. First, before inserting the sliding pin 6 into the pin guide hole 4 of the mounting member 1, the protection boot 9
The guide hole side mounting portion 9B of the mounting member 1 into the boot mounting groove 5
And the protection boot 9 is attached to the arm 1A of the attachment member 1 in a free state.

Next, for example, an automatic assembly device (not shown)
The pin shaft 6A of the slide pin 6 is inserted into the boot from the pin-side mounting portion 9D of the protective boot 9 by using the pin guide hole of the mounting member 1 with the pin shaft 6A directed in the direction of arrow A. 4
Insert gradually into the inside.

As a result, the guide surface 6C of the sliding pin 6
Is a pin-side mounting portion 9D of the protective boot 9 as shown in FIG.
It comes into sliding contact with. When the sliding pin 6 is further inserted into the pin guide hole 4, the bellows 9 of the protection boot 9 is inserted.
A is compressed and deformed, and the air sealed in the annular space S between the protective boot 9 and the sliding pin 6 is compressed. As a result, the pin-side mounting portion 9D slides on the guide surface portion 6C in the direction of arrow B toward the boot mounting groove 7 by air pressure or the like in the annular space S, and climbs over the annular protrusion 6B of the sliding pin 6. After that, it is fitted into the boot mounting groove 7 with a tight allowance.

[0020]

In the prior art described above, the slide pin 6 is inserted into the pin guide hole 4 in the direction of arrow A in FIG. Then, the pin-side mounting portion 9D of the protective boot 9 is dragged by the guide surface portion 6C of the sliding pin 6 due to frictional resistance, and falls down in the arrow B 'direction so as to be wound in the bellows portion 9A. There is.

For this reason, in the prior art, a worker or the like temporarily stops the operation of the automatic assembling device and the like, and rewinds the pin-side mounting portion 9D and the like wound in the bellows portion 9A manually to slide the sliding pin. 6 has to be re-attached to the boot mounting groove 7, and there is a problem in that the work of assembling and replacing the protective boot 9 is troublesome.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to allow the pin-side mounting portion of the protective boot to be easily mounted on the sliding pin, thereby facilitating the assembling work. It is an object of the present invention to provide a disc brake which can be executed.

[0023]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a mounting member which is mounted on a non-rotating portion of a vehicle, and which is disposed so as to be displaceable in the axial direction of a disk with respect to the mounting member. A caliper for pressing a friction pad against a disc; a pin guide hole provided in one of the mounting member and the caliper and extending in the axial direction of the disc; and a pin guide hole provided in the other of the mounting member and the caliper. A slide pin that is inserted into the pin guide hole and slidably supports the caliper; and a cylindrical protection boot that protects a slide surface between the pin guide hole and the slide pin. Applies to disc brakes.

A feature of the structure adopted in the first aspect of the invention is that the protective boot is formed in a cylindrical shape so as to cover the sliding pin from the outside, and can be extended and contracted in the axial direction of the sliding pin. A bellows portion, a guide hole side mounting portion provided on one end side of the bellows portion and mounted on the opening end side of the pin guide hole,
A pin-side mounting portion provided on the other end side of the bellows portion via a cylindrical connection portion and mounted on the outer peripheral side of the sliding pin with a tightening margin, and the bellows portion and the pin-side mounting portion A structure in which a connecting rib provided between the connecting portions is provided with a reinforcing rib for preventing the pin-side mounting portion from falling down radially inward of the connecting portion when the protective boot is mounted on the outer peripheral side of the sliding pin. And that

With this configuration, during the operation of assembling the protective boot, the pin-side mounting portion is slid on the outer peripheral side of the sliding pin, for example, a groove or the like provided on the outer peripheral side of the sliding pin. Can be installed with a tight allowance at the installation site. At this time, the reinforcing rib can prevent the pin-side mounting portion from falling down so as to be wound inward in the radial direction of the connection portion due to frictional resistance with the sliding pin.

According to the second aspect of the present invention, the protection boot is formed between the protection boot and the slide pin when the protection boot is mounted on the outer peripheral side of the slide pin. An air bleed passage for escaping the air in the space to the outside is provided.

In this way, at the time of assembling the protective boot, the connecting portion is elastically deformed by frictional resistance between the pin-side mounting portion and the sliding pin, so that the pin-side mounting portion is directed radially inward via the connecting portion. You can lean on As a result, the air vent passage can be opened in the annular space between the sliding pin and the protective boot, and when the protective boot is compressed and deformed during the assembling work, the air in the annular space is discharged from the air vent passage to the outside. You can escape.

Further, according to the invention of claim 3, the air vent passage is provided at a position different from the reinforcing rib in the circumferential direction.

In this case, since the portion of the connecting portion of the protective boot where no reinforcing rib is provided has flexibility,
The air vent passage can be arranged at a circumferential position corresponding to this portion. Thereby, at the time of assembling the protective boot, the pin-side mounting portion can be smoothly inclined to the inner peripheral side at the position of the air vent passage, and the air vent passage is stably opened in the annular space in the protective boot. be able to.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a disc brake according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. In this embodiment, the same components as those of the prior art are denoted by the same reference numerals, and description thereof will be omitted. Shall be.

Reference numeral 11 denotes a protective boot used for the disc brake according to the present embodiment. The protective boot 11 is integrally formed as a bellows-like cylinder with an elastic material such as rubber, for example. .. Are constituted by a side mounting portion 13, a connecting portion 14, a pin side mounting portion 15, reinforcing ribs 16, 16,. The protective boot 11 is disposed so as to surround the sliding pin 6 from the outside, and protects the sliding surface between each pin guide hole 4 of the mounting member 1 and the sliding pin 6 from external dust, rainwater, and the like. It is.

Numeral 12 denotes a cylindrical bellows portion forming an intermediate portion in the length direction of the protective boot 11, and the bellows portion 12 surrounds the sliding pin 6 in the axial direction in substantially the same manner as in the prior art. It is stretchable.

Reference numeral 13 denotes a guide hole side mounting portion provided at one end side of the bellows portion 12. The guide hole side mounting portion 13 is formed as a thick ring having a substantially rectangular cross section. Are fitted into the boot mounting grooves 5 with a tight allowance.

Reference numeral 14 denotes a connecting portion provided on the other end side of the bellows portion 12. The connecting portion 14 is a thin wall connecting the bellows portion 12 and the pin side mounting portion 15 as shown in FIGS. Each of the reinforcing ribs 16 is formed as a cylindrical body, and is provided between the other end and the pin-side mounting portion 15 at intervals in the circumferential direction. In addition, each of the reinforcing ribs 1 in the entire peripheral portion of the connection portion 14 is provided.
6 are a plurality of inter-rib peripheral wall portions 14A which are more flexible than the portions where the reinforcing ribs 16 are provided.

When the protective boot 11 is assembled, as shown in FIG. 5 described later, the connecting portion 14 bends and deforms in the axial direction and the radial direction, so that the pin-side mounting portion 15 is inclined with respect to the axial direction. The sliding pin 6 is in sliding contact with the guide surface 6C of the sliding pin 6 in this state.

Reference numeral 15 denotes a pin-side mounting portion provided at the other end of the bellows portion 12 via a connection portion 14.
Is formed as a thick ring having a substantially quadrangular cross section substantially in the same manner as the guide hole side mounting portion 13, and the inner diameter thereof is slightly smaller than the outer diameter of the sliding pin 6 at the position of the boot mounting groove 7. Has become. The pin-side mounting portion 15 is fitted in the boot mounting groove 7 with a tight allowance.

Are a plurality of reinforcing ribs provided between the connecting portion 14 of the protective boot 11 and the pin-side mounting portion 15, and each of the reinforcing ribs 16 is, as shown in FIGS. It has a substantially triangular cross-sectional shape, is protruded from the inner peripheral side of the connecting portion 14 as a protrusion extending in an arc shape in the circumferential direction, and is integrated with one end surface of the pin-side mounting portion 15. I have.

The reinforcing ribs 16 are arranged at substantially constant intervals in the circumferential direction, and a portion of the connecting portion 14 located between the respective ribs is an inter-rib peripheral wall portion 14A. In this case, as shown in FIG.
Has a thickness of, for example, about 1 to 2 mm, and the thickness t1 is about 1.2 to 3 times the thickness t2 of the inter-rib peripheral wall portion 14A.

The reinforcing rib 16 is attached to the pin-side mounting portion 1.
The rigidity of the protective boot 11 including the end 5 is increased, so that the pin-side mounting portion 15 is wound around the inner peripheral side of the connecting portion 14 by the frictional resistance with the sliding pin 6 at the time of assembling the protective boot 11. It is to suppress falling down so that it may fall.

By arranging the reinforcing ribs 16 at intervals in the circumferential direction, the peripheral wall 14A between the ribs of the connecting portion 14 is elastically deformed in the circumferential direction between the reinforcing ribs 16 at the time of assembling the protective boot 11. As a result, the diameter of the entire connecting portion 14 is easily increased, so that the elastic tightening force applied to the pin-side mounting portion 15 by the reaction force (restoring force) at this time can be reduced, and the tightening force can be reduced. Sliding pin 6 and pin side mounting part 1
5 can be suppressed.

The disk brake according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

Next, an operation of assembling the protective boot 11 will be described with reference to FIGS.

First, as shown in FIG. 4, before the sliding pin 6 is inserted into the pin guide hole 4 of the mounting member 1, the guide hole side mounting portion 13 of the protective boot 11 is mounted on the mounting member 1. It fits in the groove 5. Thus, the protective boot 11 is attached to the arm 1A of the attachment member 1 in a free state extending in a tubular shape.

Next, for example, an automatic assembly device (not shown)
Protect the pin shaft 6A of the sliding pin 6 using a protective boot 11
5 and the pin shaft 6A is inserted in the direction indicated by the arrow A in FIG.
It is gradually inserted into the pin guide hole 4 of the mounting member 1 in the direction. Thereby, the guide surface portion 6C of the sliding pin 6
Is slidingly contacted with the pin-side mounting portion 15 of the protective boot 11, the pin-side mounting portion 15 of the protective boot 11 receives frictional resistance from the guide surface 6C, and the bellows portion 12 is compressed in the axial direction.

When the sliding pin 6 is further inserted into the depth side of the pin guide hole 4, the connecting portion 14 is bent and deformed as shown in FIG. It is in a state of being inclined. Further, the pin-side mounting portion 15 receives the restoring force of the bellows portion 12 in this state, so that the pin-side mounting portion 15 slides on the guide surface portion 6C of the sliding pin 6,
It is guided by the guide surface portion 6C and gets over the annular protrusion 6B. As a result, the pin-side mounting portion 15 is fitted into the boot mounting groove 7 of the sliding pin 6 with an interference, and the protection boot 11
Can be assembled between the pin guide hole 4 of the mounting member 1 and the sliding pin 6.

In this case, the pin-side mounting portion 15 is
When sliding on the guide surface portion 6C, since the vicinity thereof is given moderately high rigidity by the reinforcing ribs 16, the pin-side mounting portions 15 are substantially evenly distributed over the entire circumference by the reinforcing ribs 16. , And the pin-side mounting portion 15 can be prevented from being largely bent inward by frictional resistance with the guide surface portion 6C.

Also, the pin side mounting portion 15 is
When the upper portion slides toward the boot mounting groove 7, the other end of the protective boot 11 is elastically deformed and gradually expands in diameter. Since the diameter is easily expanded in the circumferential direction and the diameter is increased substantially uniformly over the entire circumference, the connecting portion 14 is connected to the pin-side mounting portion 15.
The elastic tightening force applied to the shaft is reduced.

As a result, the frictional resistance generated between the guide surface 6C of the sliding pin 6 and the pin-side mounting portion 15 of the protective boot 11 can be suppressed, and the pin-side mounting portion 15 guides against the frictional resistance. It can slide smoothly on the surface portion 6C toward the boot mounting groove 7.

Thus, according to the present embodiment, the connecting portion 14 of the protective boot 11 is provided with a plurality of reinforcing ribs 16 at intervals in the circumferential direction. 11 can be increased, and during the assembling work, the pin-side mounting portion 15 can be stably slid along the guide surface portion 6C of the sliding pin 6 while being supported by the reinforcing ribs 16. .

As a result, the sliding pin 6 is inserted into the pin guide hole 4
When the pin-side mounting portion 15 is inserted into the inside, the pin-side mounting portion 15 can be reliably prevented from falling down to the inner peripheral side due to frictional resistance with the guide surface portion 6C. It can be fitted smoothly.

Further, the reinforcing ribs 16 can increase the rigidity of the connecting portion 14 at a plurality of locations in the circumferential direction, and can provide the inter-rib peripheral wall portion 14A with appropriate flexibility. When the sliding pin 6 slides on the guide surface portion 6C while expanding its diameter, the connecting portion 14 is connected to each of the rib-to-rib peripheral wall portions 1.
The diameter can be easily increased by 4A.

As a result, compared with the case where a ring-shaped thick portion or the like is provided over the entire periphery of the connection portion 14 instead of, for example, each reinforcing rib 16, the connection portion 14 is added to the pin side mounting portion 15. Since the elastic fastening force can be reduced, the pin-side mounting portion 15 can be smoothly fitted into the boot mounting groove 7 against the frictional resistance with the sliding pin 6.

Therefore, according to the present embodiment, the pin-side mounting portion 15 of the protective boot 11 can be efficiently mounted in the boot mounting groove 7 of the sliding pin 6, and the assembling work can be performed smoothly. Can be.

FIGS. 6 to 8 show a second embodiment according to the present invention.
This embodiment is characterized in that an air vent passage is provided in the pin-side mounting portion of the protective boot. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 21 denotes a protective boot 11 according to the first embodiment.
Instead of the protective boot applied to the present embodiment, the protective boot 21 has a bellows portion 12, a guide hole side mounting portion 13, a connection portion 14, and a pin side mounting substantially in the same manner as in the first embodiment. It is constituted by a portion 15, each reinforcing rib 16, and the like.
However, each ventilation groove 22 is formed in the pin-side mounting portion 15 of the protective boot 21.

Reference numerals 22 and 22 denote ventilation grooves formed on the end face of the pin-side mounting portion 15 as air vent passages.
6 and 7, as shown in FIGS. 6 and 7, the end face of the pin-side mounting portion 15 is formed as a concave groove extending in the radial direction and opening on the inner peripheral side and the outer peripheral side, It is located at the location.

At the time of assembling the protective boot 21, as shown in FIG. 8, when the pin-side mounting portion 15 is slid on the guide surface portion 6C of the sliding pin 6 in a state of being inclined, the ventilation groove Reference numeral 22 designates an annular space S formed between the protective boot 21 and the sliding pin 6 and communicates with the outside.
It allows the air inside to escape to the outside.

When the pin-side mounting portion 15 is fitted into the boot mounting groove 7 of the sliding pin 6, the ventilation groove 22 is cut off from the annular space S. And the sliding surface between the pin guide hole 4 and the pin guide hole 4 can be reliably sealed.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. And especially in this embodiment,
Since the ventilation groove 22 is provided in the pin-side mounting portion 15 of the protective boot 21, the durability and performance of the brake can be improved.

That is, in the prior art, since the air in the annular space S tends to remain in a compressed state after the protection boot 9 is assembled, this air pressure is transmitted to the friction pad 3 via the caliper 2 when the brake is used. The disk 10
The contact pressure of the friction pad 3 with respect to the friction pad 3 increases, and when the brake operation is released, the drag of the friction pad 3 increases, and the friction pad 3 may be worn out at an early stage.

However, when the ventilation groove is simply provided in the pin-side mounting portion 9D of the protective boot 9, if the air pressure in the annular space S is reduced by the ventilation groove during the assembling work, the pin-side mounting portion is not provided. 9D is likely to fall down on the inner peripheral side of the connecting portion 9C due to frictional resistance with the sliding pin 6, so that workability at the time of assembly is reduced.

On the other hand, in the present embodiment, the protective boot 21 is provided with the reinforcing rib 16 and the ventilation groove 22, so that the air compressed in the annular space S is supplied to the protection boot 21 during the assembling work. The reinforcing ribs 16 can prevent the pin-side mounting portion 15 from falling down on the inner peripheral side of the connection portion 14 even when the air pressure is reduced. Accordingly, it is possible to prevent the friction pad 3 from being dragged while enhancing the workability at the time of assembling the boot, and to stably operate the disc brake for a long period of time.

Next, FIGS. 9 and 10 show a third embodiment according to the present invention. This embodiment is characterized in that the air vent passage is provided at a position different from the reinforcing rib in the circumferential direction. I did it. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes the protective boot 11 according to the first embodiment.
Instead of the protective boot applied to the present embodiment, the protective boot 31 includes a bellows portion 12, a guide hole side mounting portion 13, a connecting portion 14, and a pin side mounting substantially in the same manner as in the second embodiment. Portions 15, reinforcing ribs 16, etc., and ventilation grooves 32, 32 are formed on the end surface of the pin-side mounting portion 15.

However, each ventilation groove 32 is disposed at a position different from each reinforcing rib 16 in the circumferential direction, and is formed at a position corresponding to the inter-rib peripheral wall portion 14 A of the connection portion 14.

Thus, also in the present embodiment configured as described above, substantially the same operation and effect as in the second embodiment can be obtained. And especially in this embodiment,
Since the ventilation groove 32 can be disposed at a position corresponding to the flexible inter-rib peripheral wall portion 14A, the assembling work of the protection boot 31 requires the ventilation groove 3 of the pin-side mounting portion 15 as shown in FIG.
2 can be smoothly inclined toward the inner peripheral side by the inter-rib peripheral wall portion 14A, and the ventilation groove 32 is formed in the annular space S.
The air inside can be released more reliably. Further, for example, the air staying in the space S ′ in FIG. 10 can be guided to the sliding pin 6 at a position near the ventilation groove 32.

Next, FIG. 11 shows a fourth embodiment according to the present invention. The feature of this embodiment is that the interval between the reinforcing ribs is made large at the position of the ventilation groove. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 41 denotes the protective boot 11 according to the first embodiment.
Instead of the protective boot applied to the present embodiment, the protective boot 41 has a bellows portion 12, a guide hole side mounting portion 13, a connecting portion 42, and a pin side mounting substantially in the same manner as in the first embodiment. It is constituted by a portion 15, each reinforcing rib 16, and the like.

However, the reinforcing ribs 16 are arranged, for example, at a large interval at two locations in the circumferential direction, and the inter-rib peripheral wall portion 42A located at the interval between the two locations in the connecting portion 42 is provided.
Are formed longer in the circumferential direction than the inter-rib peripheral wall portion 42B located at other intervals. The end face of the pin-side mounting portion 15 is provided on each of the inter-rib peripheral wall portions 42 in the circumferential direction.
A ventilation groove 43 is provided at a position corresponding to A.

Thus, also in the present embodiment configured as described above, it is possible to obtain substantially the same operation and effect as in the third embodiment. And especially in this embodiment,
High flexibility can be added to the inter-rib peripheral wall portion 42 </ b> A disposed at a position corresponding to the ventilation groove 43 in the connection portion 42, and the air release performance of the ventilation groove 43 can be further improved.

In each of the above embodiments, six or eight reinforcing ribs 16 are provided at the connecting portions 14, 42 of the protective boots 11, 21, 31, 41, but the present invention is not limited to this. Instead, the protective boot may be provided with an arbitrary number of reinforcing ribs. For example, the protective boot may be provided with one reinforcing rib extending in a substantially C-shape in the circumferential direction.

In the embodiment, the pin guide hole 4 is provided on the mounting member 1 side of the mounting member 1 and the caliper 2, and the slide pin 6 is provided on the caliper 2 side. However, the present invention is not limited thereto, and a slide pin may be provided on the mounting member side and a pin guide hole may be provided on the caliper side.

[0074]

As described above in detail, according to the first aspect of the present invention, the connecting portion of the protective boot is provided with the reinforcing rib for preventing the pin-side mounting portion from falling inward in the radial direction at the time of assembly. Therefore, the reinforcing rib can increase the rigidity of the protective boot in the vicinity of the pin side mounting portion, and during the assembling work, prevent the pin side mounting portion from falling down to the inner peripheral side due to frictional resistance with the sliding pin. In this state, the pin-side mounting portion can be stably slid along the outer peripheral side of the sliding pin. Also, for example, by providing the reinforcing ribs at intervals in the circumferential direction of the connecting portion, a portion of the connecting portion located between the reinforcing ribs can be given appropriate flexibility, so that the connecting portion is provided with the reinforcing rib. Even if there is, the elastic tightening force applied to the pin-side mounting portion from the connection portion can be reduced, and the pin-side mounting portion can be smoothly mounted on the mounting portion on the sliding pin side against the frictional resistance. Therefore, the work of assembling the protective boot can be performed efficiently.

According to the second aspect of the present invention, since the pin-side mounting portion of the protective boot is provided with the air vent passage, the air compressed in the protective boot is vented during the assembling work. It can escape from the passage to the outside.
Even when the air pressure in the protective boot is reduced due to the air vent passage, the pin-side mounting portion can be prevented from falling down to the inner peripheral side of the connection portion by the reinforcing rib, and the assembling work can be performed smoothly. Can be. In addition, when the brake is used, no high air pressure remains in the protective boot, so that it is possible to prevent the friction pad from being dragged due to the air pressure being applied to the sliding pin, thereby improving the durability and performance of the brake. Can be.

Further, according to the third aspect of the present invention, since the air vent passage is provided at a position different from the reinforcing rib in the circumferential direction, it corresponds to a flexible portion of the connecting portion of the protective boot. Thus, the air vent passage can be arranged. Thereby, at the time of assembling the protective boot, the pin-side mounting portion can be smoothly inclined to the inner peripheral side at the position of the air vent passage, and the air in the protective boot can be more reliably released.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a sliding pin, a protective boot and the like of a disk brake according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the protective boot in FIG. 1 in a free state.

FIG. 3 is a cross-sectional view of the protective boot as viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is an enlarged cross-sectional view showing a state in which a guide hole side mounting portion of the boot is fitted into a boot mounting groove of a mounting member at the time of assembling the protective boot.

FIG. 5 is an enlarged sectional view showing a state in which a pin-side mounting portion of the protective boot slides on a guide surface of a sliding pin.

FIG. 6 is a longitudinal sectional view showing a protective boot of a disc brake according to a second embodiment of the present invention.

FIG. 7 is a plan view of the protective boot shown in FIG. 6;

FIG. 8 is an enlarged sectional view showing a state in which air in the boot is released from the ventilation groove to the outside at the time of assembling the protective boot.

FIG. 9 is a plan view showing a protective boot of a disc brake according to a third embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view showing a state in which air in the boot is released from the ventilation groove to the outside at the time of assembling the protective boot.

FIG. 11 is a plan view showing a protective boot of a disc brake according to a fourth embodiment of the present invention.

FIG. 12 is a front view of a conventional disc brake.

FIG. 13 is an enlarged sectional view showing a sliding pin, a protective boot and the like in FIG.

FIG. 14 is an enlarged cross-sectional view showing a state where the pin-side mounting portion of the protective boot accidentally falls down to the inner peripheral side of the connecting portion during the assembling work of the protective boot.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Attachment member 2 Caliper 3 Friction pad 4 Pin guide hole 5, 7 Boot attachment groove 6 Sliding pin 10 Disk 11, 21, 31, 41 Protective boot 12 Bellows part 13 Guide hole side attachment part 14, 42 Connection part 14A, 42A , 42B Peripheral wall between ribs 15 Pin-side mounting portion 16 Reinforcement rib 22, 32, 43 Vent groove (air vent passage)

Claims (3)

[Claims] 1. A mounting member mounted on a non-rotating part of a vehicle, a caliper disposed so as to be displaceable in the axial direction of a disk with respect to the mounting member, and a caliper pressing a friction pad against the disk. A pin guide hole provided in one of the members and extending in the axial direction of the disc; and a slidable slide of the caliper by being inserted into the pin guide hole provided in the other member of the mounting member and the caliper. A disc brake comprising: a sliding pin for supporting the sliding pin; and a cylindrical protective boot for protecting a sliding surface between the pin guide hole and the sliding pin, wherein the protective boot holds the sliding pin from outside. A bellows portion formed in a tubular shape so as to cover and extendable in the axial direction of the sliding pin; and a guide hole side provided at one end of the bellows portion and attached to an open end side of the pin guide hole. And a pin-side mounting portion provided on the other end side of the bellows portion via a cylindrical connecting portion and mounted on the outer peripheral side of the sliding pin with a tightening margin, the bellows portion and the pin side The connecting portion provided between the mounting portion and the reinforcing portion prevents the pin-side mounting portion from falling inward in the radial direction of the connecting portion when the protective boot is mounted on the outer peripheral side of the sliding pin. A disc brake characterized by having ribs. 2. A pin-side mounting portion of the protective boot is configured to remove air in a space formed between the protective boot and the sliding pin when the protective boot is mounted on an outer peripheral side of the sliding pin. 2. The disc brake according to claim 1, further comprising an air vent passage for releasing. 3. The disc brake according to claim 2, wherein the air vent passage is provided at a position different from the reinforcing rib in a circumferential direction.