JP4212185B2 - Caliper body for disc brakes for vehicles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity and assemblability of a caliper body and to reduce the number of machining man-hours after formation of a caliper body. SOLUTION: A pair of caliper half-bodies 4 and 4 molded in the same shape by a single mold are used in a caliper body 3. A union hole 23 and a bleeder hole are after-formed in the same shape in the caliper half-bodies 4 and 4 after molding, and the caliper half-bodies 4 and 4 in the same finishing shape are integrally coupled together through coupling bolts 14 and 14.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a caliper body for a disc brake mounted on a vehicle such as a four-wheeled vehicle or a motorcycle, and more particularly to a split-type caliper body configured by connecting a pair of caliper halves.
[0002]
[Prior art]
For example, Japanese Patent Application Laid-Open No. 1-188730 and Japanese Utility Model Publication No. 7-47626 disclose conventional examples of using a split caliper body for a vehicle disc brake.
[0003]
The former caliper body is composed of a pair of caliper halves divided into two sides on the both sides of the disc rotor, butting the caliper halves together with a plurality of connecting bolts. The caliper half on the vehicle body attachment side is provided with a pair of vehicle body attachment portions, a union boss portion, and a bleeder boss portion.
[0004]
In the latter technique, the caliper body is divided into a pair of caliper halves at the center position of the thickness of the disc rotor, and caliper body mounting brackets for mounting the car body are interposed on the split surfaces of both caliper halves. The bracket and the pair of caliper halves are connected together by a plurality of connecting bolts, and a union hole for introducing hydraulic fluid and a bleeder hole for discharging mixed air in the hydraulic fluid are opened in the caliper bracket. Yes.
[0005]
[Problems to be solved by the invention]
However, the former caliper body uses a dedicated molding die for one caliper half on the car body mounting side having a car body mounting part and a union boss part and the other caliper half not having such a partial structure. Therefore, the caliper halves after molding must be processed separately, so that the productivity and economic efficiency are remarkably inferior.
[0006]
In the latter caliper body, both caliper halves are shared, but a separate bracket is sandwiched between them, which increases the number of parts and makes it difficult to assemble them. It is difficult to manage the dimensions to connect to.
[0007]
The present invention has been made against the background of such circumstances, and the object of the present invention is to provide a caliper body for a vehicle disc brake that is excellent in productivity and assembly, and that can reduce the number of processing steps after molding. It is to provide at low cost.
[0008]
[Means for Solving the Problems]
According to the above-mentioned purpose, a pair of caliper halves divided on both sides of the disk rotor are provided with cylinder holes for accommodating the pistons, and a hydraulic chamber defined at the bottom of the cylinder hole communicates with the liquid passage. In the caliper body of a piston-opposing vehicle disc brake formed by integrally connecting a pair of caliper halves, the first of the present invention is that the caliper body has the same shape formed by a single mold. After forming the pair of caliper halves, the same processing is performed to form the same finished shape, the divided surfaces are butted and inserted into a plurality of bolt insertion holes in the disk axial direction formed in these caliper halves, respectively. The bolts are connected integrally by screwing connection bolts, and the bolt insertion holes are formed between the rotation center of the disk rotor and the caliper body in the pair of caliper halves. Each of the pair of caliper halves is formed in parallel with the caliper center line near the outer ends of the pair of caliper halves in the circumferential direction of the disk. Each of the pair of caliper halves is provided with a counterbore hole for connecting the liquid passage so as to open to the dividing surface, and from the counterbore hole toward the hydraulic pressure chamber. A liquid passage is formed, and a seat portion is formed by the molding die on the outer surface of the pair of caliper halves, and a hole communicating with the cylinder hole or the liquid passage is formed in each of the seat portions, One of the caliper half holes is a union hole for introducing hydraulic fluid, and the other caliper half hole is not a bleeder hole for discharging mixed air in the hydraulic fluid. A pair of caliper halves as a caliper body is provided on the dividing surface between the bolt insertion hole and a counterbore hole for connecting a liquid passage that communicates with each of the hydraulic pressure chambers via the liquid passage. When connecting integrally, the annular seal material is fitted over the counterbore holes overlapped on each of the disk circumferential direction side portions, and the liquid passages of the pair of caliper halves are connected in a liquid-tight manner. It is a feature.
[0009]
Further, according to a second aspect of the present invention, the caliper body is formed by forming a pair of caliper halves into one in a state in which the body mounting brackets protrude from the caliper halves on the inner side in the disk radial direction and one side in the disk circumferential direction. Molded in the same shape with a mold, drilled a body mounting hole at the tip of each body mounting bracket on one of the caliper halves after molding, and cut off each body mounting bracket on the other caliper half At the same time , both caliper halves are processed to the same finish and formed into the same finished shape, the divided surfaces are butted together, and the connecting bolts respectively inserted into the plurality of bolt insertion holes in the disk axial direction formed in these caliper halves The bolt insertion holes are connected to the rotation center of the disk rotor in the pair of caliper halves. Serial molded through each sandwiched therebetween symmetrical positions caliper centerline of the disk radial direction connecting the center of the caliper body, wherein the pair of the caliper halves, counterbored hole for the fluid passage connected to said dividing plane The liquid passages are formed from the counterbore holes to the hydraulic pressure chambers, and seat portions are formed on the outer surfaces of the pair of caliper halves by the molding die. A hole communicating with the cylinder hole or the fluid passage is formed in each of them, and a hole of one caliper half is formed as a union hole for introducing hydraulic fluid, and a hole of the other caliper half is formed in the hydraulic fluid. A bleeder hole for discharging mixed air, and a fluid passage connection for communicating with each of the fluid pressure chambers via the fluid passage on the dividing surface between the vehicle body mounting hole and the bolt insertion hole The counterbore is open When a pair of caliper halves are integrally connected as a caliper body, the pair of caliper halves are fitted over the counterbore holes overlapped on each of the circumferential sides of the disk across the annular seal material. The liquid passages are connected in a liquid-tight manner.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
1 to 3 show a first embodiment of the present invention. The disc brake 1 divides the caliper body 3 disposed across the outside of the disc rotor 2 along the thickness center of the disc rotor 2. A two-pot piston facing type in which cylinder holes 5 and 5 are opposed to a pair of caliper halves 4 and 4 that are divided into two equal parts on both sides of the disk rotor 2, and each cylinder hole 5 has a bottomed cylindrical shape. The piston 6 is fluid-tightly and movably inserted, a hydraulic chamber 7 is defined between the piston 6 and the bottom of the cylinder hole 5, and the pistons 6, 6 sandwiching the disk rotor 2 are arranged. A pair of friction pads 8, 8 are suspended between the tips so as to be movable in the disk axial direction using hanger pins 9.
[0014]
The caliper body 3 has the same shape of caliper halves 4 and 4 formed by a single mold (not shown) in opposite directions, but the divided surfaces 10 and 10 are butted against each other and the ceiling opening 11 is sandwiched therebetween in the disk circumferential direction. Two bolts 14 and 14 are screwed in opposite directions to the bolt insertion holes 12 and 12 and the female screw holes 13 and 13 joined to both sides in the disk axial direction, and are integrally connected. In forming the caliper half 4 using the forming die, the vehicle body mounting holes 15 and 15 and the counterbore holes 16 and 16 for connecting the liquid passage are formed together with the cylinder hole 5, the ceiling opening 11, and the bolt insertion holes 12 and 12. And the ridge part 3a for hanger pin mounting | wearing and the boss | hub part 3b for a hole process corresponded to the seat part of this invention are integrally formed.
[0015]
Among these, each of the cylinder hole 5 excluding the boss portion 3b, the bolt insertion holes 12, 12 and the female screw holes 13, 13, the vehicle body attachment holes 15, 15, counterbore holes 16, 16 and the ridge portion 3a is a disc rotor. The caliper center line L in the radial direction of the disk connecting the rotation center 2 and the center of the caliper body 3 is formed in the same size at a symmetrical position, and the pair of caliper halves 4 and 4 are connected to the connecting bolt 14 as described above. , 14 are located equidistant from the caliper center line L, and the bolt insertion holes 12, 12 and the female screw holes 13, 13 are located diagonally. The boss portion 3b is slightly inclined to one side from the caliper center line L. When the pair of caliper halves 4 and 4 are connected by the connecting bolts 14 and 14 as described above, as shown in FIG. Located on the outer surface of the caliper body 3 diagonally.
[0016]
The bolt insertion holes 12 and 12 of the caliper half 4 are formed so as to penetrate in the disk axial direction near the ceiling opening 11 on both sides of the disk in the circumferential direction, and after molding by the molding die, the bolt insertion holes 12 are opposite to each other. The above-described female screw hole 13 is cut on the split surface side. The vehicle body mounting holes 15, 15 of the caliper half 4 are formed so as to penetrate the caliper center line L near the outer ends on both sides in the circumferential direction of the disk, and when mounting the caliper body 3 to the vehicle body, Two of the caliper halves 4 (two on the left and right sides of the upper or lower caliper halves 4 in FIG. 1) or both sides of the caliper halves 4 and 4 between the disc circumferential directions 10 and 10 are sandwiched. The two adjacent ones (two on either the left or right in FIG. 1) are attached to the vehicle body with a so-called radial mount.
[0017]
Counterbore holes 16, 16 for connecting the liquid passage are provided to the dividing surface 10 between the bolt insertion holes 12 and the vehicle body attachment holes 15 on both sides in the circumferential direction of the disk, and after the caliper half 4 is molded, A fluid passage 20 is bored from each counterbore 16 toward the fluid pressure chamber 7 at the bottom of the cylinder hole. Further, when the caliper halves 4 and 4 are integrally connected as the caliper body 3, the caliper halves 4 and 4 are fitted over the annular sealing material 21 in the counterbore holes 16 and 16 which are overlapped on the respective sides in the circumferential direction of the disk, By connecting the fluid passages 20 and 20 on both sides in a fluid-tight manner, the fluid pressure chambers 7 and 7 and the four fluid passages 20 are connected in a loop.
[0018]
The ridges 3 a and 3 a for attaching the hanger pins are arranged to face the outer surface of the caliper body 3 with the ceiling opening 11 interposed therebetween, and pin insertions formed in the ridges 3 a and 3 a after the caliper half 4 is formed are inserted. The hanger pins 9 are inserted into the holes 22, 22, and the friction pads 8, 8 are suspended from both sides of the disk rotor 2 by the hanger pins 9. Holes communicating with the cylinder hole 5 or the liquid passage 20 are formed in the same shape in the bosses 3b, 3b for hole processing after the caliper half 4 is formed, and either one of the holes is used for introducing hydraulic fluid. A union hole 23 is provided, and the other is a bleeder hole 24 for bleeding air. The union hole 23 and the bleeder hole 24 are formed with a large-diameter female screw hole on the boss portion 3b side, and a small-diameter hole on the cylinder hole 5 or the liquid passage 20 side. The female screw hole of the union hole 23 is formed on the brake hose. A union bolt (not shown) to be connected is screwed, and the union hole 23 is closed by a bleeder screw 25 screwed into the female screw hole.
[0019]
The present embodiment is configured as described above, and the caliper body 3 of the disc brake 1 is configured by connecting the caliper halves 4 and 4 having the same shape formed by one molding die. The two split mold caliper bodies required by the two are now only one expensive mold, which makes it possible to halve the processing man-hours for molding and enable mass production, as well as significantly increase production costs. Can be reduced.
[0020]
Further, the caliper body 3 of the present embodiment has the same position and shape of components such as the cylinder hole 5, the bolt insertion hole 12, the female screw hole 13, the vehicle body mounting hole 15, the union hole 23, and the bleeder hole 24. Since a pair of caliper halves 4 with a perfect finish shape is used as a pair, post-processing such as cutting of these components after molding of the caliper halves 4 can be done by one type, and the number of processing steps can be further reduced, resulting in higher productivity. Improvement can be achieved. Further, since the caliper body 3 having the same shape can be shared on the left and right sides of the vehicle body, the productivity, the vehicle body assembly property, and the economy are excellent.
[0021]
Of the components that can be formed by cutting or the like after the caliper half 4 is molded, for example, the union hole 23 and the bleeder hole 24 are processed to have different diameter holes in accordance with the flow rate of the working fluid or air. Is also possible.
[0022]
In this embodiment, the pair of caliper halves 4 and 4 used for the caliper body 3 are set in a diagonal relationship with the bolt insertion hole 12 and the female screw hole 13 in order to form one type of shape. 4, one bolt insertion hole 12 and one female screw hole 13 are provided one by one, or one caliper half 4 has two bolt insertion holes 12, 12 and the other caliper half 4 has two female screw holes. 13 and 13 may be provided, and these may be combined.
[0023]
Next, a second embodiment of the present invention will be described with reference to FIGS. In the figure, the same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof is omitted.
[0024]
The disc brake 30 according to this embodiment is configured by connecting the caliper halves 31 and 31 having the same shape in which the ridge portion 31a, the boss portion 31b, and the like are formed by the connecting bolts 14 and 14 by a single molding die (not shown). Although the caliper body 32 is common to the first embodiment described above, the caliper body 32 of the present embodiment has disk mounting holes in the radial direction of the disk as in the first embodiment on the outer surfaces of both sides in the disk circumferential direction. Rather, it is different from the first embodiment of the radial mount type in that it is attached to the vehicle body using two vehicle body mounting brackets 31c and 31d protruding from one caliper half 31.
[0025]
The above-mentioned vehicle body mounting brackets 31c and 31d are integrally formed on the inner side of the caliper half 31 in the disk radial direction and one side in the disk circumferential direction when the caliper half 31 is formed by the above-described mold. Car body mounting holes 33, 33 are formed at the tips of the car body mounting brackets 31c, 31d of either caliper half 31 (solid line shape in FIGS. 4 and 5), and from the other caliper half body 31, the car body mounting bracket 31c is formed. , 31d (the phantom line portion in FIGS. 4 and 5) and the caliper halves 4 and 4 are connected by connecting bolts 14 and 14, thereby forming a caliper body 32.
[0026]
Since the caliper body 32 of the present embodiment cuts out the other body mounting brackets 31c and 31d after molding, the caliper halves 31 and 31 do not have the same shape. Among the effects described in the first embodiment, The pair of caliper halves 31 and 31 constituting the caliper body 32 is formed as a single mold, so that the number of processing steps at the time of molding can be halved and mass production can be achieved, and the production cost can be greatly reduced. It will be a thing.
[0028]
In the first and second embodiments described above, both caliper halves have been connected by a screw bolt using a female screw hole. However, the present invention can also be connected by a through bolt. Furthermore, if the caliper half is formed integrally with the cylinder hole or the body mounting hole set as a caliper body component in the caliper half as a prepared hole or a finished shape, It is preferable that post-processing can be omitted or simplified, but the present invention can be formed in a range that can be integrally formed by a mold and can be set to the same for both caliper halves forming the caliper body. The caliper halves are not molded with a mold by limiting the specific components of the caliper body.
[0029]
【The invention's effect】
As described above , according to the present invention, the caliper body of the disc brake is configured by connecting caliper halves of the same shape formed by one mold, and is necessary for the conventional two-part caliper body. The two expensive molds that have been used can be reduced by one, so the mold cost can be reduced, the number of processing steps at the time of molding can be halved and mass production is possible, and the production cost is greatly reduced. be able to.
[0030]
Also, since the post-processing for molding and finishing of the pair of the caliper halves constituting the key Yaripabodi requires only one minute, the number of processing steps and with higher attained is further improved productivity can reduce the caliper of the same shape Since the body can be shared on the left and right sides of the vehicle body, it is excellent in terms of productivity, vehicle assembly, and economy.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional plan view of a disc brake showing a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along II-II in FIG. 1 showing a first embodiment of the present invention. FIG. 4 is a partial sectional side view of a disc brake showing a second embodiment of the present invention. FIG. 5 is a partial sectional plan view of a disc brake showing a second embodiment of the present invention. Partial sectional front view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,30 ... Hydraulic type disc brake 2 ... Disc rotor 3, 32 ... Caliper body 3a, 31a ... Ridge part 3b, 31b for mounting a hanger pin ... Boss part for hole processing (seat part of the present invention)
4, 31 ... Caliper half 5 ... Cylinder hole 6 ... Piston 7 ... Hydraulic pressure chamber 8 ... Friction pad 10 ... Dividing surface 12 ... Bolt insertion hole 13 ... Female screw hole 14 ... Connection bolt 15 ... Car body mounting hole 16 ... Fluid passage Counterbore hole 20 ... Liquid passage 21 ... Annular seal material 23 ... Union hole 24 for introducing hydraulic fluid ... Breeder hole 25 for releasing air ... Breeder screw 31c, 31d ... Car body mounting bracket 33 ... Car body mounting hole L ... Disk Caliper centerline in the radial direction of the disk connecting the rotation center of the rotor 2 and the center of the caliper body 3

Claims (2)

A pair of caliper halves divided on both sides of the disk rotor are provided with opposing cylinder holes for piston storage,
The hydraulic chamber defined at the bottom of the cylinder hole communicates with the liquid passage,
In a caliper body of a piston-opposed vehicle disc brake formed by integrally connecting a pair of caliper halves,
The caliper body is formed into the same finished shape by performing the same processing after molding a pair of caliper halves of the same shape formed by one molding die, but the divided surfaces are butted together,
These caliper halves are integrally connected by screwing connection bolts respectively inserted into a plurality of bolt insertion holes in the disk axial direction formed in the caliper halves,
The bolt insertion holes are respectively formed in the pair of caliper halves so as to pass through symmetrical positions across a caliper center line in the disc radial direction connecting the rotation center of the disc rotor and the center of the caliper body,
Near the outer ends of both sides of the pair of caliper halves in the circumferential direction of the disc, vehicle body mounting holes are formed penetrating in parallel with the caliper center line,
The pair of caliper halves are provided with counterbore holes for connecting the liquid passages to the dividing surface, and the liquid passages are drilled from the counterbore holes toward the hydraulic chamber,
A seat portion is formed on the outer surface of the pair of caliper halves by the molding die, and a hole communicating with the cylinder hole or the liquid passage is formed in each of the seat portions, and either one of the caliper halves is formed. The hole of the other is a union hole for introducing hydraulic fluid, the hole of the other caliper half is a bleeder hole for discharging mixed air in the hydraulic fluid,
On the divided surface between the vehicle body mounting hole and the bolt insertion hole, a counterbore hole for connecting a fluid passage communicating with the fluid pressure chambers via the fluid passage is opened and provided.
When a pair of caliper halves are integrally connected as a caliper body, an annular seal material is fitted over the counterbore holes overlapped on each of the disk circumferential direction side portions, and the liquid passages of the pair of caliper halves A caliper body for disc brakes for vehicles, characterized in that they are connected in a liquid-tight manner. A pair of caliper halves divided on both sides of the disk rotor are provided with opposing cylinder holes for piston storage,
The hydraulic chamber defined at the bottom of the cylinder hole communicates with the liquid passage,
In a caliper body of a piston-opposed vehicle disc brake formed by integrally connecting a pair of caliper halves,
The caliper body is formed by molding a pair of caliper halves into the same shape with a single mold, with the vehicle body mounting brackets protruding from the inner side in the disk radial direction and one side in the disk circumferential direction of each caliper half. Car body mounting holes are drilled at the ends of the car body mounting brackets of either one of the latter caliper halves, and each car body mounting bracket of the other caliper half is excised, and both caliper halves are identical. Formed into the same finished shape by processing, but the divided surfaces are butted together, and the connecting bolts inserted through the plurality of bolt insertion holes in the disk axial direction formed in these caliper halves are screwed together and integrally connected Become
The bolt insertion holes are respectively formed in the pair of caliper halves so as to pass through symmetrical positions across a caliper center line in the disc radial direction connecting the rotation center of the disc rotor and the center of the caliper body,
The pair of caliper halves are provided with counterbore holes for connecting the liquid passages to the dividing surface, and the liquid passages are drilled from the counterbore holes toward the hydraulic chamber,
A seat portion is formed on the outer surface of the pair of caliper halves by the molding die, and a hole communicating with the cylinder hole or the liquid passage is formed in each of the seat portions, and either one of the caliper halves is formed. The hole of the other is a union hole for introducing hydraulic fluid, the hole of the other caliper half is a bleeder hole for discharging mixed air in the hydraulic fluid,
On the dividing surface between the vehicle body attachment hole and the bolt insertion hole, a counterbore hole for connecting a fluid passage communicating with each of the fluid pressure chambers through the fluid passage is opened to provide a caliper body. When the pair of caliper halves are connected together, the annular seal material is fitted over the counterbore holes overlapped on each of the disk circumferential direction side parts, and the liquid passages of the pair of caliper halves are liquidated. A caliper body for a vehicle disc brake characterized by being closely connected.

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