JPH04285334A - Divided type brake caliper - Google Patents

Abstract

PURPOSE:To reduce sizes of caliper and a support by reducing a diameter of an interference avoiding line in respect to a wheel, and to obtain high rigidity preferable in view of brake characteristic by decreasing a bending moment of sliding pins at the time of braking by a piston. CONSTITUTION:In a divided brake caliper 1, a main body having a piston and pad which pressurize one side of a rotor is connected to a reaction part 3 which pressurizes the other side of the rotor at a plurality of portions by means of fastening member. Time caliper 1 is supported movably to a caliper support 5 by means of sliding pins 7, 7 at two portions of the rotor rotating-in side and the rotor rotating-out side across the piston. The fastening member is integrated with the sliding pins 7 so as to connect the main body with the reaction part 3. In addition, the centers P, p of the sliding pins 7 and a piston centers O arranged substantially linearly in a side view.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a brake caliper for a disc brake, and in particular, it has a piston that pushes one side of the rotor only on the main body side, and a reaction part that receives the other side of the rotor is connected to the main body as a fastening member. This invention relates to a split-type brake caliper that is connected at a plurality of locations and movably supported on a caliper support by slide pins at two locations on the rotor retraction side and the rotor retraction side with the piston in between.

0002

2. Description of the Related Art In a split brake caliper for a disc brake, a main body having one piston and a pad that presses one side of the rotor, and a reaction part having a pad that presses the other side of the rotor are used in the part facing the rotor. A device which is connected by two guide bolts on the outer circumferential side and movably supported on a caliper support via the guide bolts is known from Japanese Utility Model Application Publication No. 159476/1983. Similarly, in the split type brake caliper, a main body with two pistons and a reaction part thereof,
The caliper support is connected with three bolts on the outer periphery of the part facing the rotor, and is movably supported on the caliper support by two slide pins provided on the rotor rotation side and rotor rotation side with the piston in between. This is known from Japanese Publication No. 55-14294, and the centers of both pistons and the centers of both slide pins are arranged substantially in a straight line when viewed from the side.

As disclosed in the above-mentioned Japanese Utility Model Application Publication No. 53-159476, the caliper body and the caliper reaction part are connected by two guide bolts which also serve as slide pins for the caliper support on the outer peripheral side of the part facing the rotor. In this case, a bending moment is applied to the guide bolt portion during braking by the piston, which is unfavorable from the viewpoint of braking performance. On the other hand, as disclosed in the above-mentioned Japanese Patent Publication No. 55-14294, by arranging the centers of each two pistons and slide pins on a substantially straight line when viewed from the side, the bending moment can be reduced, resulting in good braking performance. However, since the caliper body and the caliper reaction part are connected by three bolts on the outer circumferential side of the part facing the rotor, similar to the one disclosed in the above-mentioned Japanese Utility Model Publication No. 53-159476, the caliper body The increase in size and weight has become unavoidable.

For this reason, FIGS. 13 and 14, FIGS. 15 and 1 eliminate the bolt connection on the outer circumferential side of the part facing the rotor.
The split type brake caliper shown in 6 has also been put into practical use. First, in the examples shown in FIGS. 13 and 14, 1 is a brake caliper, 2 is a caliper body, 3 is a caliper reaction part,
4 is bolt/nut, 5 is caliper support, 6 is slide pin, O is piston center, P is 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 main body 2 formed with two cylinders 21, 21 each housing a piston (not shown), and a caliper reaction part 3 opposing this are provided in two sets on the retraction side and the retraction side of the rotor (not shown). are connected by bolts and nuts 4, 4, and movably supported by slide pins 6, 6 relative to the caliper support 5, and in side view as shown in FIG. 14, both piston centers O, O and both slide pins The centers P, P are
They are arranged on a straight line L. In the examples shown in FIGS. 15 and 16, the straight line Lp connecting the slide pin centers P and P is parallel to the straight line Lo connecting the piston centers O and O to the rotor center side.

[0005]

[Problems to be Solved by the Invention] In the examples shown in FIGS. 13 and 14, both piston centers O, O and both slide pin centers P, P are arranged on a straight line L in side view, so the piston Both slide pins 6 during braking due to
, 6 parts can be eliminated and the braking performance is good, but both slide pins 6 and 6 parts are located on the outer periphery side with respect to the rotor center than the caliper connection part by bolts and nuts 4, 4. Therefore, this becomes a constraint in terms of further compactness. For this reason, by eliminating the placement of the slide pin on the outer periphery side of the caliper connection part by the bolts and nuts 4, 4 with respect to the rotor center, and reducing the diameter of the interference avoidance line W with the wheel (see Wo), the Figures 15 and 16 are compact versions of
In this example, if the slide pins 6, 6 are arranged on the rotor center side along the rotor circumferential direction of the caliper connection part by the bolts and nuts 4, 4, both slide pins 6 are disposed during braking by the pistons. , and 6, which causes contradictory problems such as undesirable braking performance.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a split brake caliper that has rigidity that is advantageous in terms of braking performance and that allows the caliper and support to be made more compact.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a main body having a piston and a pad that presses one side of the rotor, and a reaction part having a pad that presses the other side of the rotor, using a fastening member. In a split brake caliper that is connected at multiple points and movably supported by slide pins on the caliper support at two locations on the rotor rotation side and rotor rotation side with the piston in between, the fastening member is attached to the slide pin. It is characterized in that the main body and the reaction part are combined by integrating the main body and the reaction part, and the centers of both the slide pins and the center of the piston are arranged substantially in a straight line when viewed from the side. In the above, the straight line connecting the centers of both slide pins is perpendicular to the straight line connecting the center of the rotor and the center of the piston, and the main body has two pistons, and the center of both the pistons is It is also characterized in that the connecting straight line coincides with the straight line connecting the centers of both slide pins. The present invention is also characterized in that it has a closed cross section surrounding a braking portion for the rotor closer to the center of the rotor than the straight line connecting the centers of both slide pins, and furthermore, on the outer peripheral side of the portion facing the rotor,
It is also characterized by having an opening larger than the diameter of the piston.

[0008]

[Operation] The caliper body with the piston and its caliper reaction part are connected by slide pins integrated with the fastening member at two places on the rotor rotation side and rotor rotation side with the piston in between, so there is no interference with the wheel. By reducing the diameter of the avoidance line, the caliper and support can be made even more compact.Moreover, since the centers of both slide pins and the center of the piston are arranged approximately in a straight line when viewed from the side, the parts of both slide pins when braking with the piston are This reduces the bending moment and provides good rigidity for braking performance. By providing a closed cross section that surrounds the braking part for the rotor and located closer to the center of the rotor than the straight line connecting the centers of both slide pins, high rigidity is obtained, and furthermore, the part facing the rotor including this closed cross section By providing an opening larger than the piston diameter on the outer circumferential side of the piston, weight reduction can be achieved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. 1 to 3 showing a split brake caliper and a caliper support installed state according to a first embodiment of the present invention, 1 is a brake caliper, 2 is a caliper body, 3 is a caliper reaction part, and 5 is a caliper support ,
7 is the slide pin, O is the piston center, P is the slide pin center, R is the interference avoidance line with the rotor, and S is the caliper dividing surface. A caliper body 2 made of cast steel and having two cylinders 21, 21 each housing a piston (not shown);
The caliper reaction part 3, which is also made of cast steel and faces this,
The input and output sides of the rotor (not shown) are connected by slide pins 7, 7 that are integrated with a set of fastening members, respectively, and caliper supports made of cast steel, cast iron, forged products, or sheet metal. 5, and when viewed from the side as shown in Fig. 2, both piston centers O
, O and both slide pin centers P, P are arranged on a straight line L.

Specifically, the caliper main body 2 includes thin connecting support pieces 23, 23 on both sides of a central thick wall portion 22 having two cylinders 21, 21, and bolt through holes 24 are provided in the connecting support pieces 23. is formed. Although not shown, each cylinder 21, 21 houses a piston that pushes one side of the rotor, and the protruding ends of both pistons are provided with pads that slide into one side of the rotor. The caliper reaction part 3 includes arm parts 32, 32 extending toward the caliper main body 2 on both sides of a central part 31 facing the central thick part 22 of the caliper main body 2, and is coupled to the protruding ends of the arm parts 32, 32. Support piece 33
, 33, and a screw hole 34 is formed in this coupling support piece 33. Although not shown, a pad is provided on the inner surface of the center portion 31 to make sliding contact with the other side surface of the rotor. The caliper support 5 has mounting holes 5 at both ends of a bridge-shaped mounting piece 51.
2, 52, and arm parts 53, 53 extending from both sides of the mounting piece 51 along the outside of the arms 32, 32 of the caliper reaction part 3, and a slide pin insertion hole 54 is provided in the arm part 53. A bridge-shaped reinforcing piece 55 is provided to connect the protruding ends of the arm parts 53, 53. The slide pin 7 is a bolt 71 having a head 72 and a threaded portion 73, with a pin portion 74 integrally provided at the tip.

Regarding assembly, the connecting and supporting pieces 23 and 23 of the caliper body 2 are stacked with the connecting and supporting pieces 33 and 33 of the caliper reaction section 3, and the threaded portion 73 of the bolt 71 of the slide pin 7 is screwed into place at each location. By fastening through the through hole 24 to the screw hole 34, the brake caliper 1 is joined together at both sides of the caliper body 2. And the slide pin insertion hole 5 of the arm part 53, 53 of the caliper support 5
4 and 54, the pin portions 74 at the tips of the bolts 71 of the slide pins 7 are slidably fitted, respectively, and the pin portions 74 between the arm portions 53 and the coupling support pieces 33 are covered and sealed with boots 79. In the above-mentioned assembled state, as shown in FIG. 2, both piston centers O, O and both slide pin centers P, P are arranged on a straight line L in side view,
Moreover, this straight line L is between the rotor center and both piston centers O,
It is perpendicular to the straight line N connecting the midpoint between the piston centers O and O at the midpoint between the two piston centers.

[0012] The brake caliper 1 is formed with a closed cross-section part 11 which is located closer to the center of the rotor than the straight line L and surrounds a part for braking the rotor by combining the main body 2 and the reaction part 3. Moreover, an opening 12 larger than the diameter of the piston, that is, the diameter of the cylinder 21 is formed on the outer circumferential side of a portion including this closed cross section 11 and facing the rotor. The reinforcing piece 55 of the caliper support 5 has a curved shape located on the extension line of both piston centers O, O on the outside of the central part 31 of the caliper reaction part 3, as shown in FIG.

According to the split type brake caliper 1 having the above structure, the caliper body 2 has two pistons and pads that press one side of the rotor, and the caliper reaction part 3 has a pad that presses the other side of the rotor. , because of the structure in which they are connected by slide pins 7, 7 that are integrated with the fastening member at two places on the rotor retraction side and the rotor retraction side with the piston in between, special fastening members are required including the outer circumferential side of the part facing the rotor. By eliminating this, 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 even more compactly. Then, when viewed from the side, both slide pin centers P, P and both piston centers O, O are rotor center and both piston centers O, O.
Since the structure is arranged on a straight line L that is perpendicular to the straight line N connecting the midpoint between the two piston centers O and O, both slide pins 7, 7 during braking by the pistons.
The bending moment of the part can be eliminated, and therefore the best rigidity can be obtained in terms of braking performance.

Moreover, the brake caliper 1 has a main body 2
Due to the combination of the and the reaction part 3, the closed cross-section part 11 is located closer to the center of the rotor than the straight line L and surrounds the part for braking the rotor, so it has the best rigidity. Furthermore, the brake caliper 1 has this closed cross-section portion 1.
1 and has an opening 12 larger than the piston diameter on the outer peripheral side of the portion facing the rotor, which is also excellent in terms of weight reduction.

In the above embodiment, the caliper main body 2 has two pistons, but it can be similarly applied to a caliper having one piston. The straight line connecting P and P is perpendicular to the straight line connecting the rotor center and one piston center O. Furthermore, the centers P and P of both slide pins and the center O of the piston are not necessarily located on a straight line L, but even if they are located substantially on a straight line, the bending moment of both slide pins 7 and 7 portions during braking by the piston is can be reduced.

FIG. 4 shows another structure of the slide pin 7 which also serves as a fastening member. It is configured. That is, in the overlapping connecting support pieces 23 and 33, the threaded portion 73 of the bolt 71 of the slide pin 7 is inserted through the bolt through holes 24 and 35 of the pin 7.
5, and bolt head 71 and pin 7.
The brake caliper 1 is joined together by sandwiching the joining support pieces 23, 33 between the brake calipers 1 and 5. Further, the end surface of the coupling support piece 33 on the pin 75 side is provided with diametrically opposing anti-rotation protrusions 36, 36, and the outer periphery of the pin 75 is provided with a diametrically opposing flat surface as shown in FIG. By forming the pins 77, 77, a structure for preventing the pin 75 from rotating is provided. Incidentally, the connecting support piece 33 may be provided with a screw hole 34 similarly to the embodiment described above, and the threaded portion 73 of the bolt 71 may be fastened thereto.

Next, a second embodiment will be explained. In the second embodiment shown in FIGS. 6 and 7, the caliper body 2
Both the caliper reaction part 3 and the caliper reaction part 3 are made of aluminum, and the same reference numerals are given to the same components as in the first embodiment, and the explanation of their structure and operation and effect will be omitted. The difference from the first embodiment is that the caliper body 2 and the caliper reaction part 3 are made of aluminum, which is inferior to cast steel in terms of rigidity. Near the outer circumferential side of the rotor, the coupling support piece 23 of the caliper main body 2 and the arm portion 32 of the caliper reaction section 3 are coupled by through-type bolts and nuts 4, 4, which serve as fastening members. In this split-type brake caliper 1 made of aluminum, which is inferior in rigidity compared to cast steel, the caliper body 2 and the caliper reaction part 3 are fastened at each location on the rotor rotation side and rotor rotation side. Rigidity is ensured by connecting two points on each side using bolts and nuts 4, which are members, and slide pins 7, which also serve as fastening members.

Next, a third embodiment will be explained. In the third embodiment shown in FIGS. 8 and 9, the caliper body 2
Both the caliper reaction part 3 and the caliper reaction part 3 are made of cast steel, and the same components as in the first embodiment are designated by the same reference numerals, and explanations of their structures and effects will be omitted. The difference from the first embodiment is the position of the caliper dividing surface S and its connection and support structure. That is, the caliper dividing surface S is located on the reinforcing piece 55 side with respect to the mounting piece 51 of the caliper support 5. The caliper reaction part 3 is provided with thin connecting support pieces 23, 23 extending toward the reaction part 3 side, and the caliper reaction part 3 is provided with connecting support pieces 33, 33 at the protruding ends of the arm parts 32, 32 on both sides of the central part 31. The caliper support 5 also includes plate portions 56 and 5 extending along the outside of the arm portions 32 and 32 of the caliper reaction portion 3 from both sides of the mounting piece 51.
6, and a reinforcing piece 55 that connects the protruding ends of the plate parts 56, 56.
Arm parts 53, 53 extending along the outside of the arm parts 32, 32 of the caliper reaction part 3 are provided on both sides.

Regarding assembly, the brake caliper 1 is joined together by joining the joining support pieces 23 and 33 by the slide pins 7 on both sides of the approximately intermediate position of the caliper body 2 and the caliper reaction part 3, and the brake caliper 1 is joined together. The slide pin 7 is slidably fitted into the arm portion 53. In this way, the caliper body 2 and the caliper reaction part 3
may be combined at approximately the intermediate position.

Next, a fourth embodiment will be explained. Figure 10
In the fourth embodiment shown in FIG. 11, both the caliper body 2 and the caliper reaction part 3 are made of aluminum,
Components similar to those in the second embodiment are designated by the same reference numerals,
Explanation of its structure and effects will be omitted. The difference from the second embodiment is that the slide pin 7 also serves as a fastening member.
The structure is That is, a slide pin 7 (not shown) is set up on the side of the caliper support 5, and the slide pin 7 is connected to a pin screwed into the arm part 53 of the caliper support 5, the caliper body 2, and the caliper reaction part 3. It is composed of a hollow bolt 171 and a nut 175 that connect the connecting support pieces 23 and 33. As shown in an enlarged cross section in FIG. 12, in the overlapping joint support pieces 23 and 33, a hollow bolt 171 having a flange portion 172 is passed through the bolt through holes 35 and 24 from the joint support piece 33 side. By fastening the nut 175 to the threaded portion 173 of 171, the hollow bolt flange portion 172 and the nut 1
The brake caliper 1 is joined together by sandwiching the joining support pieces 23 and 33 between 75, and 176 is the nut 175.
This is a washer interposed between the connecting support piece 23 and the connecting support piece 23.

[0021] A pin (not shown), which is screwed and implanted in the arm portion 53 of the caliper support 5, is slidably fitted into the hollow portion 174 of the hollow bolt 171. The hollow bolt 171 and nut 1 that connect the pin erected on the caliper support 5 side with the caliper body 2 and caliper reaction part 3 in this way
75 may constitute the slide pin 7 which also serves as a fastening member. It is of course possible to use other suitable structures as the slide pin 7 which also serves as a fastening member. Further, by installing bolts and nuts that connect the caliper body 2 and the caliper reaction part 3 on the rotor outer circumferential side of the opening 12, for example, it is possible to prevent the pad from falling off and to ensure further rigidity. is also possible.

[0022]

As described above, according to the split brake caliper of the present invention, the caliper main body having the piston and its caliper reaction part are arranged at two locations on the rotor retraction side and the rotor retraction side with the piston in between. Because it is connected by a slide pin integrated with the fastening member, the diameter of the interference avoidance line with the wheel can be reduced, making the caliper and support even more compact.Moreover, the center of both slide pins and the center of the piston can be Since the slide pins are arranged substantially in a straight line when viewed from the side, the bending moment of both slide pin portions during braking by the piston can be reduced, and good rigidity can be provided in terms of braking performance. By having a structure with a closed cross section that surrounds the braking part for the rotor, which is located closer to the center of the rotor than the straight line connecting the centers of both slide pins, high rigidity can be obtained. By providing an opening larger than the piston diameter on the outer peripheral side of the portion facing the rotor, weight reduction can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a plan view from the rotor side showing a divided brake caliper and a caliper support installed state according to a first embodiment of the present invention;

[Figure 2] Side view also seen from the reaction part side

[Figure 3] Figure 2
A cross-sectional view along the arrow A-A line of

[Fig. 4] Enlarged sectional view showing another structure of a slide pin that also serves as a fastening member

[Fig. 5] Cross-sectional view taken along the arrow B-B line in Fig. 4

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

[Figure 7] Side view also seen from the reaction part side

FIG. 8 is a plan view from the rotor side showing a divided brake caliper and a caliper support installed state according to a third embodiment of the present invention;

[Figure 9] Side view also seen from the reaction part side

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

[Figure 11] Side view also seen from the reaction part side

[Figure 12]
An enlarged sectional view showing the structure of a slide pin that also serves as a fastening member in the fourth embodiment

[Fig. 13] A plan view of a conventional split brake caliper and caliper support as seen from the rotor side.

[Figure 14] Side view also seen from the reaction part side

[Fig. 15] A plan view from the rotor side showing another conventional example of a split brake caliper and a caliper support installed state.

[Figure 16] Side view also seen from the reaction part 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 the rotor, S... Caliper dividing surface.

Claims (5)

[Claims] Claim 1: A main body having a piston and a pad that presses one side of the rotor, and a reaction part having a pad that presses the other side of the rotor are connected at multiple points by fastening members, and the rotor rotates with the piston in between. Input side and output side 2
In a split type brake caliper movably supported on a caliper support by slide pins at several locations, the fastening member is integrated with the slide pin to connect the main body and the reaction portion, and the center of both slide pins A split brake caliper characterized in that the center of the piston is arranged substantially in a straight line when viewed from the side. 2. The split brake caliper according to claim 1, wherein a straight line connecting the centers of both slide pins is perpendicular to a straight line connecting the rotor center and the piston center. 3. The main body has two pistons,
2. The split brake caliper according to claim 1, wherein a straight line connecting the centers of both pistons coincides with a straight line connecting the centers of both slide pins. 4. The split type brake caliper according to claim 1, further comprising a closed cross section surrounding a braking portion for the rotor closer to the center of the rotor than a straight line connecting the centers of both slide pins. 5. On the outer peripheral side of the portion facing the rotor,
5. The split brake caliper according to claim 4, wherein the split brake caliper has an opening larger than the piston diameter.