JP2937270B2 - Split brake caliper - Google Patents

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 disk brake, and more particularly to a brake caliper having a piston for pressing one side of a rotor only on a main body side, and a reaction member for receiving the other side of the rotor with respect to the main body. The present invention relates to a split-type brake caliper which is movably supported on a caliper support by slide pins at two positions on a rotor inflow side and a discharge side with a piston interposed therebetween.

[0002]

2. Description of the Related Art In a split type brake caliper for a disc brake, a main body having one piston and a pad pressing one side of the rotor and a reaction portion having a pad pressing the other side of the rotor are formed by a portion facing the rotor. Is connected by two guide bolts on the outer peripheral side of the shaft and is movably supported by the caliper support via the guide bolts, which is known from Japanese Utility Model Laid-Open Publication No. 53-159476. Similarly, in a split-type brake caliper, a main body having two pistons and a reaction portion thereof are connected by three bolts on the outer peripheral side of a portion facing the rotor, and the rotor is inserted into and out of the rotor with the piston interposed therebetween. The one that is movably supported on the caliper support by two slide pins provided on the side is Japanese Patent Publication No. 55-1429.
This is known from Japanese Patent Application Laid-Open No. 4 (1994) -207, in which the centers of both pistons and both slide pins are arranged substantially in a straight line in a side view.

[0003] As disclosed in Japanese Utility Model Application Laid-Open No. 53-159476, the caliper main body and the caliper reaction portion are connected to each other by two guide bolts which also serve as slide pins for the caliper support on the outer peripheral side of the portion facing the rotor. In this case, a bending moment is applied to the guide bolt during braking by the piston, which is not preferable in terms of braking performance. On the other hand, by disposing the center of each of the two pistons and the center of the slide pin in a substantially straight line in a side view as disclosed in Japanese Patent Publication No. 55-14294, the bending moment can be reduced and the braking performance is improved. However, since the caliper body and the caliper reaction portion are connected to each other by three bolts on the outer peripheral side of the portion facing the rotor in the same manner as disclosed in Japanese Utility Model Application Laid-Open No. 53-159476, the caliper body It has become inevitable to increase the size and weight of the product.

[0004] For this reason, the bolt connection on the outer peripheral side of the portion facing the rotor is eliminated in FIGS.
6 has also been put to practical use. First, in the example of FIGS. 13 and 14, 1 is a brake caliper, 2 is a caliper body, 3 is a caliper reaction portion,
4 is a bolt / nut, 5 is a caliper support, 6 is a slide pin, O is a piston center, P is a slide pin center,
R is an interference avoidance line with the rotor, S is a caliper dividing surface, and W is an interference avoidance line with the wheel. A caliper body 2 having two cylinders 21 and 21 for accommodating pistons (not shown), respectively, and a caliper reaction portion 3 facing the caliper main body 2 are provided on the inlet side and the outlet side of a rotor (not shown). 14 and are movably supported by slide pins 6 and 6 with respect to the caliper support 5. As shown in FIG. 14, both piston centers O and O and both slide pins The center P, P
They are arranged on a straight line L. In the examples of FIGS. 15 and 16, a straight line Lp connecting the centers P, P of the slide pins is moved in parallel to a center line of the rotor with respect to a straight line Lo connecting the centers O, O of the pistons.

[0005]

In the examples shown in FIGS. 13 and 14, the centers O, O of the pistons and the centers P, P of the slide pins are arranged on a straight line L in a side view. The bending moment of both slide pins 6 and 6 at the time of braking can be eliminated, and the braking performance is improved. However, both slide pins 6 and 6 are located at the center of the rotor with respect to the caliper connection portion with bolts and nuts 4 and 4. Since it is located on the outer peripheral side, this is a restriction in terms of further downsizing. For this reason, by eliminating the slide pin arrangement on the outer peripheral side from the caliper coupling portion by the bolts and nuts 4 and 4 with respect to the rotor center and reducing the interference avoidance line W with the wheel (see Wo),
FIGS. 15 and 1 show a further compact design.
6, the slide pins 6 and 6 are arranged on the rotor center side along the rotor circumferential direction of the caliper connection portion by the bolts and nuts 4 and 4 as described above. A bending moment is applied to the portions 6 and 6, and contradictory problems such as unfavorable braking performance occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a split-type brake caliper in which the caliper and the support can be made more compact while having rigidity advantageous for braking performance.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a main body having two left and right pistons and pads for pressing one side of a rotor, and a reaction portion having a pad for pressing the other side of the rotor. bonded at a plurality of locations by the fastening member comprises, and across the piston encounters split brake caliper is movably supported on the caliper supported by the slide pins left and right locations of the rotor rotational inlet side and the run-out side
Then, the fastening members are integrated with the left and right slide pins.
To connect the main body and the reaction portion,
The center of the left and right slide pins and the center of the left and right pistons
And the right and left slides
A straight line connecting the center of the pin and the centers of the left and right pistons,
Orthogonal to the straight line connecting the center of the rotor and the center of the piston
And the above-mentioned straight line connecting the center of the left and right slide pins.
Surrounding the rotor center side, the braking action portion for the rotor
With a closed cross section, the outer periphery of the portion facing the rotor
It is characterized by having an opening that expands outside the left and right pistons .

[0008]

[Function] The caliper main body having the piston and the caliper reaction portion are connected by the slide pin integrated with the fastening member at the rotor inlet side and the outlet side with the piston interposed therebetween. By reducing the diameter of the avoidance line, the caliper and the support can be made more compact, and the center of both slide pins and the center of the piston are arranged substantially in a straight line when viewed from the side. The bending moment is reduced, and good rigidity is obtained in terms of braking performance. By providing a closed section surrounding the braking action portion for the rotor, which is located closer to the center of the rotor than a straight line connecting both slide pin centers, high rigidity is obtained, and further, a portion facing the rotor including the closed section. By providing an opening larger than the diameter of the piston on the outer peripheral side, the weight can be reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a split type brake caliper and a caliper support assembled state according to a first embodiment to which the present invention is applied, 1 is a brake caliper, 2 is a caliper main body, 3 is a caliper reaction portion, and 5 is a caliper support. ,
7 is a slide pin, O is a piston center, P is a slide pin center, R is an interference avoidance line with the rotor, and S is a caliper dividing surface. A cast steel caliper body 2 formed with two cylinders 21 and 21 for accommodating pistons (not shown), respectively;
The opposing caliper reaction part 3 also made of cast steel,
On the inflow side and the outflow side of the rotor (not shown), the rotor is coupled by slide pins 7, 7 integrated with one set of fastening members, respectively, and a caliper support made of cast steel, cast iron, forged product, sheet metal, or the like. 2, both piston centers O, O and both slide pin centers P, P are arranged on a straight line L in a side view as shown in FIG.

In detail, the caliper body 2 is provided with thin connecting support pieces 23 on both sides of a central thick part 22 having two cylinders 21, 21. Are formed. Although not shown, a piston for pressing one side of the rotor is housed in each of the cylinders 21 and 21, and a pad that is in sliding contact with one side of the rotor is provided at a protruding end of both pistons. The caliper reaction portion 3 has arms 32, 32 extending toward the caliper body 2 on both sides of a central portion 31 facing the central thick portion 22 of the caliper body 2, and is coupled to a protruding end of the arms 32, 32. Supporting piece 3
3 and 33, and a screw hole 34 is formed in the coupling support piece 33. Although not shown, a pad is provided on the inner side surface of the central portion 31 for sliding contact with the other side surface of the rotor. The caliper support 5 has mounting holes 52, 52 at both ends of a bridge-shaped mounting piece 51, and arms extending along the outside of the arms 32, 32 of the caliper reaction portion 3 from both sides of the mounting piece 51. The arm 53 has a slide pin insertion hole 54 formed therein and a bridge-like reinforcing piece 55 for connecting the protruding end of the arm 53.
The slide pin 7 has a pin portion 74 integrally provided at the tip of a bolt 71 having a head portion 72 and a screw portion 73.

Regarding the assembling, the coupling support pieces 33 of the caliper reaction portion 3 are superimposed on the coupling support pieces 23 of the caliper main body 2, and the screw portions 73 of the bolts 71 of the slide pins 7 are respectively bolted at the respective positions. By fastening from the through hole 24 to the screw hole 34, the brake caliper 1 is united and connected at both side positions of the caliper main body 2. And the slide pin insertion holes 5 of the arms 53 of the caliper support 5
The pin portions 74 at the tips of the bolts 71 of the slide pins 7 are slidably fitted to the pins 4 and 54, respectively, and the pin portions 74 between the arm portions 53 and the coupling support pieces 33 are covered and sealed by boots 79. In the above assembled state, as shown in FIG. 2, both piston centers O, O and both slide pin centers P, P are arranged so as to be aligned on a straight line L in a side view. The straight line L corresponds to a straight line N connecting the center of the rotor and the center point between the two piston centers O, O, and the center of both pistons O,
It is orthogonal at the midpoint between O.

The brake caliper 1 has a closed cross-sectional portion 11 formed by combining the main body 2 and the reaction portion 3 and located closer to the center of the rotor than the straight line L and surrounding the braking action portion for the rotor. In addition, an opening 12 larger than the diameter of the piston, that is, the diameter of the cylinder 21 is formed on the outer peripheral side of the portion including the closed section 11 and facing the rotor. In addition, the reinforcing piece 55 of the caliper support 5
Has a curved shape located outside the central portion 31 of the caliper reaction portion 3 as shown in FIG.

According to the split type brake caliper 1 having the above structure, the caliper body 2 having two pistons and pads for pressing one side of the rotor, and the caliper reaction portion 3 having pads for pressing the other side of the rotor. At the two positions of the rotor inflow and outflow sides with the piston interposed therebetween, a structure in which the slide pins 7, 7 integrated with the fastening member are combined, so that a dedicated fastening member including the outer peripheral side of the portion facing the rotor is provided. Abolished, the diameter of the interference avoidance line with the wheel can be reduced,
Therefore, the brake caliper 1 itself and the caliper support 5
Can be configured more compactly. Then, the center of the rotor and the center of the piston O and the center of the piston O and the center of the two pistons O and O in side view
Since the structure is arranged on a straight line L perpendicular to the center N between the pistons O and O with respect to the straight line N connecting the middle point between O, the two slide pins 7 and 7 during braking by the piston are used.
The bending moment of the seven parts can be eliminated, and therefore the best rigidity can be obtained from the viewpoint of braking performance.

Moreover, the brake caliper 1 has its main body 2
And the reaction portion 3, the structure is provided with a closed cross-section portion 11 which is located closer to the center of the rotor than the straight line L and surrounds the braking operation portion for the rotor, and thus is most excellent in terms of rigidity. Furthermore, the brake caliper 1
Because of the structure having the opening 12 larger than the piston diameter on the outer peripheral side of the portion facing the rotor, including 1, it is also excellent in terms of weight reduction.

In the above embodiment, the caliper body 2 has two pistons. However, the present invention can be similarly applied to a single caliper body. The straight line connecting P and P is orthogonal to the straight line connecting the center of the rotor and the center O of one piston. The center P of the slide pins and the center O of the piston and the center O of the piston are not necessarily located on a straight line L, and even if they are located substantially on a straight line, the bending moment of the slide pins 7, 7 during braking by the piston. Can be reduced.

FIG. 4 shows another structure of the slide pin 7 serving also as a fastening member. The slide pin 7 is a combination of a bolt 71 having a head portion 72 and a screw portion 73 and a pin 75 having a screw hole 76. It is configured. In other words, the threaded portion 73 of the bolt 71 of the slide pin 7 is inserted through the bolt passing holes 24 and 35 into the pin 7
5, the bolt head 71 and the pin 7
The brake caliper 1 is united and connected by interposing the connecting support pieces 23 and 33 between the brake caliper 5 and the brake caliper 1. Further, diametrically opposed detents 36, 36 are provided on the end face of the coupling support piece 33 on the pin 75 side, and the outer periphery of the pin 75 is provided on the outer surface of the pin 75 with a flat portion which is also diametrically opposed, as shown in FIG. By forming 77, 77, a rotation preventing structure for the pin 75 is provided. It is to be noted that the screw hole 34 may be formed in the coupling support piece 33 in the same manner as in the above embodiment, and the screw portion 73 of the bolt 71 may be fastened.

Next, a second embodiment will be described. In the second embodiment shown in FIG. 6 and FIG.
The caliper reaction portion 3 is made of aluminum, and the same components as those of the first embodiment are denoted by the same reference numerals, and the description of the structure, operation, and effect is omitted. The difference from the first embodiment is that the caliper main body 2 and the caliper reaction portion 3 are made of aluminum, which is inferior in rigidity as compared with cast steel, so that each slide pin 7 on the straight line L In the vicinity of the rotor outer peripheral side, the coupling support piece 23 of the caliper main body 2 and the arm portion 32 of the caliper reaction portion 3 are coupled by through-type bolts and nuts 4 and 4 serving as fastening members. As described above, in the aluminum split type brake caliper 1 which is inferior in rigidity to cast steel, the caliper main body 2 and the caliper reaction portion 3 are specially fastened to the rotor inlet side and the outlet side at respective locations. The rigidity is ensured by connecting two points on each side by the bolt / nut 4 as a member and the slide pin 7 also serving as a fastening member.

Next, a third embodiment will be described. In the third embodiment shown in FIG. 8 and FIG.
The caliper reaction portion 3 is made of cast steel, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description of the structure and the operation and effects is omitted. The difference from the first embodiment lies in the position of the caliper dividing surface S and the coupling support structure. That is, the caliper dividing surface S is positioned on the reinforcing piece 55 side with respect to the mounting piece 51 of the caliper support 5, and the caliper body 2 is provided on both sides of the central thick portion 22 having two cylinders 21 and 21. The caliper reaction portion 3 has thin support members 23 extending toward the reaction portion 3, and the caliper reaction portion 3 has connection support pieces 33 at the protruding ends of the arms 32 on both sides of the central portion 31. The caliper support 5 includes plate portions 56, 5 extending from both sides of the mounting piece 51 along the outer sides of the arms 32, 32 of the caliper reaction portion 3.
6 and a reinforcing piece 55 for connecting the protruding ends of the plate portions 56, 56.
Arms 53, 53 extending along the outside of the arms 32, 32 of the caliper reaction section 3 are provided on both sides.

With respect to the assembling, on both sides of the caliper main body 2 and the caliper reaction portion 3 at substantially the intermediate positions, the coupling support pieces 23 and 33 are coupled by the slide pins 7 so that the brake caliper 1 is united and coupled. The slide pin 7 is slidably fitted to the arm 53. Thus, the caliper body 2 and the caliper reaction portion 3
May be combined at a substantially intermediate position.

Next, a fourth embodiment will be described. FIG.
In the fourth embodiment shown in FIG. 11, the caliper body 2 and the caliper reaction portion 3 are both made of aluminum,
The same reference numerals are given to the same components as those in the second embodiment,
The description of the structure and the function and effect will be omitted. The difference from the second embodiment is that the slide pin 7 also serves as a fastening member.
The structure is as follows. That is, a pin (not shown) of the slide pin 7 is set up on the caliper support 5 side, and the slide pin 7 is screwed into the arm portion 53 of the caliper support 5, the caliper body 2 and the caliper reaction portion 3. And a nut 175 for coupling the coupling support pieces 23 and 33 of FIG. As shown in an enlarged cross section in FIG. 12, the hollow bolts 171 provided with the flange portions 172 are passed through the bolt holes 35 and 24 from the side of the coupling support piece 33 in the overlapped coupling support pieces 23 and 33 so that the hollow bolts are formed. By fastening the nut 175 to the screw portion 173 of the hollow 171, the hollow bolt flange portion 172 and the nut 1
The brake caliper 1 is united and connected with the connecting support pieces 23 and 33 sandwiched between the reference numerals 75.
And a washer interposed between the coupling support pieces 23.

A pin (not shown) screwed into the arm 53 of the caliper support 5 is slidably fitted in the hollow portion 174 of the hollow bolt 171. In this way, the pin erected on the caliper support 5 side, the hollow bolt 171 and the nut 1 connecting the caliper body 2 and the caliper reaction portion 3
The slide pin 7 may also be constituted from the slide pin 7. Incidentally, as the slide pin 7 also serving as a fastening member, it is needless to say that any other appropriate structure can be adopted. Further, by providing a bolt / nut for connecting the caliper body 2 and the caliper reaction portion 3 on the outer peripheral side of the rotor of the opening 12, for example, it is possible to prevent the pad from falling off and to secure further rigidity. Is also possible.

[0022]

As described above, according to the present invention , the rotor
Book with two left and right pistons and a pad pressing one side
A body and a reaction portion having a pad for pressing the other side of the rotor;
At a plurality of locations by a fastening member, and
On both sides of the rotor inlet and outlet sides
It is movably supported by the caliper support by the id pin.
Split brake caliper
The main body and the reaction
And the center of the left and right slide pins.
And the centers of the left and right pistons are substantially in a straight line in a side view.
Placed in the center of the left and right slide pins and the left and right pistons
A straight line connecting the center connects the center of the rotor with the center of the piston.
Is a line that is orthogonal to the straight line and connects the center of the left and right slide pins.
A braking action on the rotor at the rotor center side
With a closed cross section surrounding the rotor
Has an opening that expands outside the left and right pistons
Therefore, according to the split type brake caliper according to the present invention, the caliper main body having the piston and the caliper reaction portion thereof are connected to the fastening member at two positions on the rotor inlet side and the outlet side with the piston interposed therebetween. By connecting with the integrated slide pin , the line for avoiding interference with the wheel can be reduced in diameter, and the caliper and the support can be made more compact, and the center of both slide pins and the center of the piston are Since they are arranged on a substantially straight line when viewed, the bending moment of both slide pins during braking by the piston can be reduced, and good rigidity can be provided in terms of braking performance. The structure has a closed cross section that is located closer to the center of the rotor than the straight line connecting the centers of the two slide pins and surrounds the braking action part for the rotor .
Therefore , high rigidity can be obtained , and an opening larger than the diameter of the piston is provided on the outer peripheral side of a portion facing the rotor including the closed cross section , so that weight reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view from the rotor side showing a split type brake caliper and a caliper support assembled state according to a first embodiment to which the present invention is applied.

FIG. 2 is a side view similarly viewed from a reaction portion side.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is an enlarged sectional view showing another structure of a slide pin also serving as a fastening member.

FIG. 5 is a sectional view taken along the line BB of FIG. 4;

FIG. 6 is a plan view from the rotor side showing a split type brake caliper and a caliper support assembled state according to a second embodiment of the present invention.

FIG. 7 is a side view similarly viewed from the reaction portion side.

FIG. 8 is a plan view from the rotor side showing a split brake caliper and a caliper support assembled state according to a third embodiment to which the present invention is applied.

FIG. 9 is a side view similarly viewed from the reaction portion side.

FIG. 10 is a plan view from the rotor side showing a divided brake caliper and a caliper support assembled state according to a fourth embodiment to which the present invention is applied.

FIG. 11 is a side view similarly viewed from the reaction portion side.

FIG. 12 is an enlarged sectional view showing the structure of a slide pin also serving as a fastening member in a fourth embodiment.

FIG. 13 is a plan view showing a conventional example in which a split-type brake caliper and a caliper support are assembled, as viewed from the rotor side.

FIG. 14 is a side view similarly viewed from the reaction portion side.

FIG. 15 is a plan view showing a split type brake caliper and a caliper support as viewed from the rotor side, showing another conventional example.

FIG. 16 is a side view similarly viewed from the reaction portion side.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Brake caliper, 11 ... Closed section, 12 ... Opening, 2 ... Caliper main body, 21 ... Cylinder, 3 ... Caliper reaction part, 4 ... Fastening member (bolt / nut), 5 ... Caliper support, 7 ... Fastening member Integrated slide pin, O
... Piston center, P ... Slide pin center, R ... Interference avoidance line with rotor, S ... Caliper dividing surface.

Claims (1)

(57) [Claims] 1. A main body having two pistons and pads for pressing one side of a rotor and a reaction part having a pad for pressing the other side of the rotor are connected at a plurality of locations by fastening members. made, split brake caliper der being and movably supported to the caliper supported by the slide pins across the piston in the right and left two locations of the rotor rotational inlet side and the run-out side
Thus, the fastening member is integrated with the left and right slide pins,
The main body and the reaction portion are connected to each other and the left
The center of the right slide pin and the center of the left and right pistons
Are arranged substantially in a straight line in a side view, and the center of the left and right slide pins and the center of the left and right pistons
And the straight line connecting the center of the rotor and the center of the piston
The lower row is perpendicular to the straight line connecting the center of the left and right slide pins.
Close to the center of the rotor surrounding the braking action on the rotor
The left and right pistons are provided on the outer peripheral side of a portion facing the rotor.
It has an opening to expand outside the emissions, split brake caliper, wherein the this.