JPH11117964A - Brake caliper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity of a bridge part by decreasing a distance between a coupling bolt and a window hole between two bridges without interference by a communicating oil passage not so much, in a brake caliper wherein first and second caliper half bodies divided by first and second bridge parts, divided by first and second bridge parts, are intercoupled through a coupling bolt and the communication oil passage to intercommunicate hydraulic cylinders being the two caliper half-bodies is formed in the two caliper half-bodies. SOLUTION: A communicating passage 25 between the first and second hydraulic first and second hydraulic cylinders 141 and 142 comprises introduction ports 25a and 25a protruded from the bottoms of first and second hydraulic cylinders 141 and 142, formed at first and second arm parts 11 and 12 to the first bridge part 21; and a linear passage 25b extending in parallel to the coupling bolt 211 of the first bridge part 21 to interconnet the two introduction ports.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake caliper for a disc brake mounted on an automobile, a motorcycle and the like, and more particularly, to a first brake caliper opposed to a brake disc.
And second hydraulic cylinders respectively forming the first and second hydraulic cylinders
An arm portion and first and second bridge portions that integrally connect both ends of the first and second arm portions across the brake disk, and define a window hole for attaching and detaching a friction pad between the two bridge portions. The caliper body is divided into first and second caliper halves at a dividing plane passing through the first and second bridge portions,
And the dividing surfaces of the second bridge portion are connected to each other by a connecting bolt penetrating the dividing surface, and the hydraulic cylinders of the first and second arms communicate with each other through the connecting bolt and the window hole. The present invention relates to an improvement of a brake caliper in which a communication oil passage is formed in first and second caliper halves.

[0002]

2. Description of the Related Art Such a brake caliper is already known, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-166030.

[0003]

The communication oil passage between the first and second hydraulic cylinders in the conventional brake caliper is
To avoid a window between the first and second bridge sections,
It is composed of two ramps arranged in a V-shape, which are formed obliquely from the division surface of the bridge portion toward the bottom of the corresponding first hydraulic cylinder. For this reason, the bolt connecting the two caliper halves outside the V-shaped communication oil passage is obstructed by the bent portion of the communication oil passage, and the gap between the bolt and the window hole is relatively large. However, in order to enhance the rigidity of the brake caliper and to minimize the deformation of the first and second arms during hydraulic operation, the connection between the connecting bolt connecting the two caliper halves and the window between the two bridges is required. It is required to reduce the interval as much as possible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been proposed in order to reduce the distance between a connecting bolt for connecting both caliper halves and a window hole between both bridge portions without being hindered by a communication oil passage. An object of the present invention is to provide the brake caliper having high rigidity so that the brake caliper can be narrowed.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a first embodiment which opposes a brake disk.
And second hydraulic cylinders respectively forming the first and second hydraulic cylinders
An arm portion and first and second bridge portions that integrally connect both ends of the first and second arm portions across the brake disk, and define a window hole for attaching and detaching a friction pad between the two bridge portions. The caliper body is divided into first and second caliper halves at a dividing plane passing through the first and second bridge portions,
And a connecting oil passage connecting the divided surfaces of the second bridge portion with each other by a connecting bolt penetrating the divided surface, and passing between the connecting bolt and the window hole to communicate between the first and second hydraulic cylinders. Are provided in the first and second caliper halves, and the introduction ports projecting from the bottoms of the first and second hydraulic cylinders toward the first bridge portion, respectively, are connected to each other. The first feature is that the communication oil path is formed by a straight path extending in parallel with the connection bolt.

According to the first feature, the parallel arrangement of the straight path of the communication oil path and the connecting bolt makes it possible to bring these two close to each other, and to make the whole straight path close to the window. As a result, the distance between the connection bolt and the window hole can be reduced without being obstructed by the communication oil passage.

In a second aspect of the present invention, in addition to the above features, each of the introduction ports is formed by casting together with a corresponding hydraulic cylinder.

According to the second feature, a blind plug is not required when forming each of the introduction ports.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings.

FIG. 1 is a plan view of a vehicle disk brake provided with a brake caliper of the present invention, and FIG.
FIG.

In these drawings, the caliper body Ca
Is a brake disc D that rotates with wheels (not shown).
Left and right pair of first and second arms opposed to each other
1₁, 1 _TwoAnd both arms over the brake disc D
1₁, 1_TwoA pair of front and rear first parts that connect both ends of
And the second bridge section 2₁, 2_TwoIt consists of That
1st arm 1₁Extends to the center side of the brake disc D
The supporting arm 4 is integrally formed, and the arm 4
It is fixed to a wheel support member (not shown) with a bolt.

A window 3 is defined between the bridge portions 2 ₁ and 2 ₂ , and the first and second friction pads P are formed through the window 3.
_1, P ₂ is inserted between each of the first and second arms 1 _1, 1 ₂ and the brake disc D. These friction pads P ₁ , P
₂ , torque supporting portions 6a for supporting the front and rear ends of each back plate 5;
6b are respectively provided on the arms ₁ 1, 1 _2.

Bosses 7 ₁ and 7 ₂ having pin holes 8 protrude from the upper surfaces of the arms 1 ₁ and 1 ₂ , respectively, and correspond to the backs of the friction pads P ₁ and P ₂ . Pin 5 also on plate 5
Boss 9 with 0 are formed, these bosses _71,
Hanger pin 1 inserted into pin holes 8 and 10 of 7 ₂ and 9
1, the friction pads P ₁ and P ₂ are connected to the brake disc D
Is slidably supported in the axial direction. Hanger pin 11
It is enormous head 11 ₁ formed at one end thereof, retaining from the pin holes 8, 10 is achieved by a split pin 12 which is mounted on the other end.

First and second arms 1₁, 1_TwoThe break
A pair of first and second hydraulic pressure lines arranged in the circumferential direction of the disk D;
Cylinder 14₁, 14₁; 14_Two, 14_TwoBut each arm
1₁, 1 _TwoThese are provided to open on the inner surface of
First and second friction pads P₁, P_TwoPress each back plate 5
First and second pistons 15 that can be used₁, 15₁15_Two,
Fifteen_TwoAre slidably mounted. Twin hydraulics
Cylinder 14₁, 14₁; 14_Two, 14_TwoAre those
At the bottom, they communicate with each other via communication holes 18.
It is.

The caliper body Ca is made up of first and second
Judge part 2₁, 2_TwoOf brake disc D at the center of
1st arm part 1 with division surface 20 parallel to the₁First on the side
Caliper half C₁And the second arm 1_TwoSecond caliper half on the side
C_TwoAnd divided into And both caliper halves C₁, C
_TwoAre the first and second bridges 2₁, 2_TwoDividing surface at
First and second connecting bolts 21 passing through 20₁, 21_Two
Are connected to each other. That is, the first and second calipers
Half C₁, C_TwoHas a bolt insertion hole 22₁, 22 _TwoAnd
Hole 23₁, 23_TwoEach is provided with a bolt insertion hole
22₁, 22_TwoConnecting bolt 21 inserted through₁, 21_TwoTo
Screw hole 23₁, 23_TwoScrew on both
Lipa half C₁, C_TwoAre joined together. Thus
A rake caliper C is configured.

First and second caliper halves C₁, C_TwoIs casting
The hydraulic cylinder 1
4₁, 14₁; 14_Two, 14_Two, Communication hole 18, bolt insertion
Through hole 22 ₁, 22_TwoAnd screw holes 23₁, 23_TwoDownhole
In addition, the first bridge 2₁Side hydraulic cylinder 14₁, 1
4_TwoA communication oil passage 25 communicating between the cores is formed by the core.
You. That is, it is formed by casting.

The communication oil passage 25 is connected to the first bridge 2₁
Side first and second hydraulic cylinders 14 ₁, 14_TwoThe bottom of
1st bridge part 2₁Inlet port 25 extending toward
a, 25a and the tips of these introduction ports 25a, 25a
And a straight path 25b connecting between them.
The inlet ports 25a, 25a are formed by casting.
Eliminates the need for blind plugs to block
Can be planned. Note that the straight path 25b is
Drilling is also possible.

[0018] The straight path 25b, the window hole 3 as close as possible Shitsusu bolt insertion holes 22 ₁ and the screw hole 23 _1, that is, parallel to the connecting bolt 21 _1. In addition, connecting bolt 2
1 ₁ is positioned adjacent to the straight path 25b.

Further the division surface 2 each caliper half C _1, C ₂
In FIG. 0, annular recesses 26, 26 in which the straight path 25b opens are formed, and a single seal ring 27 is fitted therein to prevent oil leakage from the straight path 25b to the dividing surface. .

[0020] one of the two caliper halves C _1, C ₂ is input port 28 communicating with the hydraulic cylinder 14 ₁ is provided, the hydraulic conduit is connected which extends from the output port of the master cylinder (not shown) to .

Next, the operation of this embodiment will be described.

When a master cylinder (not shown) is operated to supply hydraulic pressure to the input port 28 of the brake caliper C,
The hydraulic pressure is transmitted to the first hydraulic cylinders 14 ₁ and 14 ₁ , and at the same time, the second hydraulic cylinder 1
5 ₁ , 15 ₂ and the first and second pistons 1
5 ₁ , 15 ₁ ; 15 ₂ , 15 ₂ are advanced to press the first and second friction pads P ₁ , P ₂ against both side surfaces of the brake disk D, so that the brake disk D is braked by the frictional force generated therebetween. can do.

At this time, the first and second pistons 15 ₁ , 15 ₁
15 ₁ ; 15 ₂ , 15 ₂ , the first and second
Arms 1 _1, 1 ₂ receives a direction of bending moment to open, but to reduce their bending deformation, the first and second
It is necessary to strengthen the rigidity of the bridge portion 2 _1, 2 _2.

The first and second bridge sections 2₁,
2_TwoBetween the first and second friction pads P₁, P_TwoDetachable
Window holes 3 are provided, so that each bridge 2₁,
2_TwoAnd second connecting bolts 2 for connecting the divided surfaces 20
1₁, 21_TwoIt is possible for each bridge to bring the
Part 2₁, 2_TwoIs effective in enhancing the rigidity of
Judge part 2₁Means that the communication oil passage 25 provided in the first
And second hydraulic cylinder 14₁, 14_TwoFrom the bottom of each
Ridge part 2₁Introduction ports 25a, 25a extending to the side;
In order to connect them to each other, a first connecting button is provided near the window hole 3.
Luto 21₁And a straight path 25b extending in parallel.
Therefore, the first connecting bolt 21₁Is too much in the communication oil passage 25
The distance from the window 3 should be reduced without disturbing
Can be. On the other hand, the second bridge unit 2_TwoHas a communication oil passage 2
5 does not exist, the second connecting bolt provided there
21_TwoIs enough in the window hole 3 without being interfered by other members.
It can be placed in close proximity. Thus, the first and the second
2 connecting bolts 21₁, 21 _Two1st and 2nd bridges
Part 2₁, 2_TwoThe rigidity of the first and the first
Arm 1₁, 1_TwoThe bending deformation of the first and second frictions is suppressed.
Rubbing pad P₁, P_TwoPrevents uneven wear of the wheel and effective braking force
Can be effectively achieved.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, the communication oil passage 25 is connected to the second bridge 2
₂ can also be provided. Further, the number of hydraulic cylinders 14 ₁ , 14 ₂ provided on each of the arms 2 ₁ , 2 ₂ may be one or two or more.

[0026]

As described above, according to the first feature of the present invention, the first and second arm portions respectively forming the first and second hydraulic cylinders opposed to each other with the brake disk interposed therebetween, and the brake disk are formed. A first and a second bridge portion that integrally connects both ends of the first and second arm portions while straddling the
A caliper body defining a window hole for attaching and detaching a friction pad between both bridge portions is divided into first and second caliper halves at a dividing surface passing through the first and second bridge portions, and the first and second bridges are divided. The divided surfaces of the parts are connected to each other by a connecting bolt penetrating the divided surface, and a first and second communication oil passages that communicate between the first and second hydraulic cylinders through the connecting bolt and the window hole. In the brake caliper drilled in the second caliper half, the first and second hydraulic cylinders are moved from the bottom to the first caliper.
Since the communication oil path is formed by the introduction port protruding toward the bridge portion and a straight path extending in parallel with the connection bolt to connect the two introduction ports, the straight path of the communication oil path and the connection bolt are connected. By the parallel arrangement, the distance between the connection bolt and the window hole can be reduced without being obstructed by the communication oil passage, and the rigidity of the bridge portion can be enhanced.

According to the second feature of the present invention, since each of the introduction ports is cast and formed together with the corresponding hydraulic cylinder, a blind plug is not required in forming each of the introduction ports, thereby improving productivity. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal plan view of a disc brake provided with a brake caliper according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;

[Explanation of symbols]

C · · · · · brake caliper Ca · · · · caliper body C ₁ · · · · first caliper half C ₂ · · · · second caliper halves D · · · · · brake disc P ₁ · · · · 1st friction pad P ₂ ··· 2nd friction pad 1 ₁ ··· 1st arm 1 ₂ ··· 2nd arm 2 ₁ ··· 1st bridge 2 ₂ ···・ Second bridge part 3 ・ ・ ・ ・ ・ ・ Window 14 ₁・ ・ ・ First hydraulic cylinder 14 ₂・ ・ ・ Second hydraulic cylinder 15 ₁・ ・ ・ First piston 15 ₂・ ・ ・ Second piston 20 ・ ・..Division surface 21 ₁ ... First connecting bolt 21 ₂ ... Second connecting bolt 25... Communication oil passage 25a.

Claims (2)

[Claims] 1. A brake disk (D) is opposed to the brake disk (D).
First and second hydraulic cylinders (14₁, 14_Two) It
The first and second arm portions (1₁, 1_Two) And blur
The first and second arms (1)₁,
1_Two1) and 1st and 2nd bridge parts which connect both ends together
(2₁, 2_Two) And both bridge sections
(2₁, 2_Two) Friction pad (P₁, P_Two) For detachable
The caliper body (Ca) defining the window (3) is
And the second bridge section (2₁, 2_Two) Through the dividing plane (2
0) and the first and second caliper halves (C₁, C_TwoSplit into)
And the first and second bridge portions (2₁, 2_Two) Split surface
(20) connecting bolts penetrating each other through the dividing surface (20);
To (21₁, 21_Two), And this connecting bolt
(21 ₁, 21_Two) And said window hole (3)
The first and second hydraulic cylinders (14 ₁, 14_Two)
The first and second calipers
(C₁, C_Two) Brake caliper that is drilled in
And the first and second hydraulic cylinders (14₁, 14_Two) At the bottom
From the first bridge (2 ₁) Side
Ports (25a, 25a) and both of these introduction ports (25
a, 25a) to connect the first bridge unit (2₁)of
Connecting bolt (21 ₁) And a straight path (25b) extending parallel to
And the communication oil passage (25) is constituted.
, Brake caliper. 2. A thing according to claim 1, characterized in that the respective inlet port (25a, 25a) of the corresponding hydraulic cylinder (14 _1, 14 ₂₎ and with cast vent forming, brake caliper.