WO2025013668A1 - ディスクブレーキ - Google Patents

ディスクブレーキ Download PDF

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Publication number
WO2025013668A1
WO2025013668A1 PCT/JP2024/023706 JP2024023706W WO2025013668A1 WO 2025013668 A1 WO2025013668 A1 WO 2025013668A1 JP 2024023706 W JP2024023706 W JP 2024023706W WO 2025013668 A1 WO2025013668 A1 WO 2025013668A1
Authority
WO
WIPO (PCT)
Prior art keywords
mounting groove
dust seal
cylinder
cylinder hole
cylinder bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/023706
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
政樹 道場
隆史 遠藤
和真 上原
裕二 町田
優 榎元
弦一 波多腰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Astemo Ltd
Original Assignee
Hitachi Astemo Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Astemo Ltd filed Critical Hitachi Astemo Ltd
Priority to JP2025532687A priority Critical patent/JPWO2025013668A1/ja
Priority to CN202480042135.6A priority patent/CN121399393A/zh
Publication of WO2025013668A1 publication Critical patent/WO2025013668A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/06—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/08—Seals, e.g. piston seals

Definitions

  • the present invention relates to a disc brake, and more specifically to a disc brake equipped with a dust seal that prevents dust from entering the cylinder bore that houses the piston.
  • the length of the dust seal mounting groove in the axial direction of the cylinder is made larger than the length of the dust seal in the axial direction of the cylinder, taking into account the thermal expansion of the dust seal.
  • this allowance makes it impossible to stabilize the position of the dust seal, and the amount of rollback of the piston becomes unstable.
  • a dust seal mounting groove 202 and a piston seal mounting groove 203 are formed in a cylinder bore 201, a dust seal 210 is mounted in the dust seal mounting groove 202, and a piston seal 211 is mounted in the piston seal mounting groove 203.
  • a piston 204 inserted in the cylinder bore 201 is actuated to push and move a friction pad 205.
  • the present invention aims to provide a disc brake that can stabilize the position of the dust seal in the dust seal mounting groove and stabilize the amount of piston rollback while keeping costs down.
  • the dust seal mounting groove formed in the cylinder hole of the disc brake of the present invention has a cylinder hole opening side surface and a cylinder hole bottom side surface formed in a direction intersecting the cylinder axis, and a mounting groove bottom surface formed between the cylinder hole bottom side surface and the cylinder hole opening side surface, and the dust seal is mounted at a position spaced apart from at least one of the cylinder hole opening side surface and the cylinder hole bottom side surface when not in operation, and the dust seal mounting groove is provided with a restricting portion that restricts the dust seal from moving in the cylinder axial direction.
  • the disc brake of the present invention by providing a regulating portion in the dust seal groove, it is possible to stabilize the position of the dust seal in the dust seal mounting groove and stabilize the amount of rollback of the piston while keeping costs down.
  • the amount of rollback can be set as desired, taking into account the amount of protrusion of the dust seal during braking, which changes depending on the dust seal mounting position.
  • FIG. 1 is a schematic cross-sectional view of a main portion of a disk brake showing a first embodiment of the present invention
  • FIG. FIG. 4 is a schematic cross-sectional view of a main portion of a disk brake showing a second embodiment of the present invention
  • FIG. 11 is a schematic cross-sectional view of a main portion of a disk brake showing a third embodiment of the present invention.
  • FIG. 11 is a schematic cross-sectional view of a main portion of a disk brake showing a fourth embodiment of the present invention.
  • FIG. 11 is a schematic cross-sectional view of a main portion of a disk brake showing a fifth embodiment of the present invention.
  • FIG. 13 is a schematic cross-sectional view of a main portion of a disk brake showing a sixth embodiment of the present invention.
  • FIG. 13 is a schematic cross-sectional view of a main portion of a disk brake showing a seventh embodiment of the present invention.
  • FIG. 13 is a schematic cross-sectional view of a main portion of a disk brake showing an eighth embodiment of the present invention.
  • FIG. 13 is a schematic cross-sectional view of a main portion of a disk brake showing a ninth embodiment of the present invention.
  • FIG. 23 is a schematic cross-sectional view of a main portion of a disk brake showing a tenth embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional view of a main portion of a conventional disc brake.
  • FIG. 1 is a schematic cross-sectional view of a main portion of a conventional disc brake.
  • Figures 1 and 2 show a first embodiment of the disc brake of the present invention.
  • the disc brake 1 has a disc rotor 2 that rotates integrally with a wheel (not shown), a caliper body 3 that is attached to the vehicle body on one side of the disc rotor 2, and a pair of friction pads 4, 4 that are arranged opposite each other with the disc rotor 2 in between.
  • the caliper body 3 is made up of an action part 3a and a reaction part 3b, which are arranged facing each other on either side of the disc rotor 2, and a bridge part 3c that connects these parts across the outer periphery of the disc rotor 2.
  • a cylinder hole 3d that houses a piston 5 is provided in the action part 3a, and a reaction claw 3e is provided in the reaction part 3b.
  • a hydraulic chamber 6 is formed between the cylinder hole 3d and the bottom of the piston 5.
  • a ring-shaped piston seal mounting groove 7 is provided in the axial center of the inner surface of the cylinder bore 3d, and a ring-shaped dust seal mounting groove 8 is further provided on the cylinder bore opening side of the piston seal mounting groove 7.
  • a piston seal 9 is fitted in the piston seal mounting groove 7, which abuts against the outer peripheral surface of the piston 5 and rolls the piston 5 back with its restoring force.
  • a dust seal 10 is fitted in the dust seal mounting groove 8, which abuts against the outer peripheral surface of the piston 5 and prevents dust from entering the cylinder bore 3d.
  • the dust seal mounting groove 8 has a cylinder bore opening side surface 8a and a cylinder bore bottom side surface 8b formed in a direction intersecting the cylinder axis CL1, and a mounting groove bottom surface 8c formed between the cylinder bore bottom side surface 8b and the cylinder bore opening side surface 8a.
  • the mounting groove bottom surface 8c serves as a restricting portion that restricts the dust seal 10 from moving in the cylinder axial direction, and is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 8, gradually decreases toward the cylinder bore opening side surface 8a.
  • the dust seal 10 is formed of a square ring with a square cross section, with an outer peripheral surface 10a that abuts against the mounting groove bottom surface 8c, a leading end surface 10b that faces the cylinder bore opening side surface 8a, a rear end surface 10c that faces the cylinder bore bottom side surface 8b, and a piston abutment surface 10d that abuts against the piston 5, all of which are flat. Furthermore, an annular recess 10e is formed in the center of the piston abutment surface 10d in the cylinder axial direction.
  • the dust seal 10 abuts its rear end surface 10c against the cylinder bore bottom side surface 8b, and when not in operation, the tip surface 10b is spaced from the cylinder bore opening side surface 8a, forming a separation portion E1 between the tip surface 10b and the cylinder bore opening side surface 8a.
  • the mounting groove bottom surface 8c is formed as a conical surface as described above, the cylinder bore opening side of the dust seal 10 is compressed between the piston 5 and the mounting groove bottom surface 8c, and the outer circumferential surface 10a of the dust seal 10 and the mounting groove bottom surface 8c of the dust seal mounting groove 8 are in close contact with each other. This restricts the movement of the dust seal 10 in the cylinder axial direction.
  • the separation portion E1 allows the dust seal 10 to maintain a good mounting state in the dust seal mounting groove 8 even if it expands due to heat. Furthermore, because the separation portion E1 is formed between the tip surface 10b of the dust seal 10 and the cylinder hole opening side surface 8a, when the disc brake 1 is activated, the dust seal 10 is dragged by the piston 5 and protrudes a large amount from the dust seal mounting groove 8 toward the cylinder hole opening. This allows the dust seal 10 to make up for the amount of rollback of the piston 5 by both the piston seal 9 and the dust seal 10.
  • FIGS. 3 to 11 show other embodiments of the present invention, in which the same components as in the first embodiment are given the same reference numerals and detailed descriptions thereof are omitted.
  • FIG. 3 shows a second embodiment of the present invention.
  • the dust seal mounting groove 20 has a cylinder bore opening side surface 20a and a cylinder bore bottom side surface 20b formed in a direction intersecting the cylinder axis CL1, and a mounting groove bottom surface 20c formed between the cylinder bore bottom side surface 20b and the cylinder bore opening side surface 20a.
  • the mounting groove bottom surface 20c constitutes the regulating portion, and, unlike the first embodiment, is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 20, gradually decreases toward the cylinder bore bottom side surface 20b.
  • the dust seal 10 has its leading end surface 10b in contact with the cylinder bore opening side surface 20a, and when not in operation, its rear end surface 10c is spaced from the cylinder bore bottom side surface 20b, forming a spaced portion E2 between the rear end surface 10c and the cylinder bore bottom side surface 20b.
  • the cylinder bore bottom side of the dust seal 10 is compressed between the piston 5 and the mounting groove bottom surface 20c, and the outer circumferential surface 10a of the dust seal 10 and the mounting groove bottom surface 20c of the dust seal mounting groove 20 are in close contact with each other. This restricts the movement of the dust seal 10 in the cylinder axial direction.
  • a separation portion E2 is formed between the rear end surface 10c of the dust seal 10 and the cylinder bore bottom side surface 20b, so that when the disc brake 1 is activated, the dust seal 10 is dragged by the piston 5 and protrudes only a small amount from the dust seal mounting groove 20 toward the cylinder bore opening. As a result, the dust seal 10 only slightly compensates for the rollback amount of the piston 5 compared to the first embodiment.
  • Figure 4 shows a third embodiment of the present invention, in which the dust seal mounting groove 30 has a cylinder bore opening side surface 30a, a cylinder bore bottom side surface 30b, and a mounting groove bottom surface 30c.
  • the cylinder bore opening side surface 30a is formed in a direction intersecting the cylinder axis CL1
  • the mounting groove bottom surface 30c is formed parallel to the cylinder axis CL1.
  • the cylinder bore bottom side surface 30b constitutes the regulating portion, and is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 30, gradually decreases from the mounting groove bottom surface 30c toward the cylinder bore bottom side surface 30b.
  • the length dimension W1 in the cylinder axial direction of the mounting groove bottom surface 30c is formed to be the same dimension as the length dimension W1 in the cylinder axial direction of the outer peripheral surface 10a of the dust seal 10.
  • the leading end surface 10b of the dust seal 10 contacts the cylinder bore opening side surface 30a, and the rear end surface 10c on the outer peripheral side of the dust seal 10 contacts the cylinder bore bottom side surface 30b (restriction portion), restricting the movement of the dust seal 10 in the cylinder axial direction.
  • the rear end surface 10c is spaced apart from the cylinder bore bottom side surface 30b, forming a separation portion E3 between the rear end surface 10c and the cylinder bore bottom side surface 30b.
  • Figure 5 shows a fourth embodiment of the present invention, in which the dust seal mounting groove 40 has a cylinder bore opening side 40a, a cylinder bore bottom side 40b, and a mounting groove bottom surface 40c.
  • the cylinder bore bottom side 40b is formed in a direction intersecting the cylinder axis CL1, and the mounting groove bottom surface 40c is formed parallel to the cylinder axis CL1.
  • the cylinder bore opening side surface 40a constitutes the regulating portion, and is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 40, gradually decreases from the mounting groove bottom surface 40c toward the cylinder bore opening side surface 40a.
  • the length dimension W2 in the cylinder axial direction of the mounting groove bottom surface 40c is formed to be the same dimension as the length dimension W2 in the cylinder axial direction of the outer peripheral surface 10a of the dust seal 10.
  • the leading end surface 10b on the outer peripheral side of the dust seal 10 contacts the cylinder bore opening side surface 40a (restricting portion), and the rear end surface 10c of the dust seal 10 contacts the cylinder bore bottom side surface 40b, restricting the movement of the dust seal 10 in the cylinder axial direction.
  • the leading end surface 10b is spaced apart from the cylinder bore opening side surface 40a, and a separation portion E4 is formed between the leading end surface 10b and the cylinder bore opening side surface 40a.
  • Figure 6 shows a fifth embodiment of the present invention, in which the dust seal mounting groove 50 has a cylinder bore opening side surface 50a and a cylinder bore bottom side surface 50b formed in a direction intersecting the cylinder axis CL1, and a mounting groove bottom surface 50c formed parallel to the cylinder axis CL1. Furthermore, a restricting portion 50d is provided at the corner between the mounting groove bottom surface 50c and the cylinder bore bottom side surface 50b.
  • the restricting portion 50d is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 50, gradually decreases from the mounting groove bottom surface 50c toward the cylinder bore bottom side surface 50b.
  • the length dimension W3 of the mounting groove bottom surface 50c in the cylinder axial direction is formed to be the same as the length dimension W3 of the outer peripheral surface 10a of the dust seal 10 in the cylinder axial direction.
  • the leading end surface 10b of the dust seal 10 contacts the cylinder bore opening side surface 50a, and the rear end surface 10c on the outer peripheral side of the dust seal 10 contacts the restricting portion 50d, restricting the movement of the dust seal 10 in the cylinder axial direction.
  • the rear end surface 10c is spaced apart from the cylinder bore bottom side surface 50b, and a separation portion E5 is formed between the rear end surface 10c and the cylinder bore bottom side surface 50b.
  • Figure 7 shows a sixth embodiment of the present invention, in which the dust seal mounting groove 60 has a cylinder bore opening side surface 60a and a cylinder bore bottom side surface 60b formed in a direction intersecting the cylinder axis CL1, and a mounting groove bottom surface 60c formed parallel to the cylinder axis CL1. Furthermore, a restricting portion 60d is provided at the corner between the mounting groove bottom surface 60c and the cylinder bore opening side surface 60a.
  • the restricting portion 60d is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 60, gradually decreases from the mounting groove bottom surface 60c toward the cylinder bore opening side surface 60a.
  • the length dimension W4 in the cylinder axial direction of the mounting groove bottom surface 60c is formed to be the same dimension as the length dimension W4 in the cylinder axial direction of the outer peripheral surface 10a of the dust seal 10.
  • the leading end surface 10b on the outer peripheral side of the dust seal 10 contacts the restricting portion 60d, and the rear end surface 10c of the dust seal 10 contacts the cylinder bore bottom side surface 60b, restricting the movement of the dust seal 10 in the cylinder axial direction.
  • the leading end surface 10b is spaced apart from the cylinder bore opening side surface 60a, and a separation portion E6 is formed between the leading end surface 10b and the cylinder bore opening side surface 60a.
  • Figure 8 shows a seventh embodiment of the present invention, in which the dust seal mounting groove 70 has a cylinder bore opening side surface 70a and a cylinder bore bottom side surface 70b formed in a direction intersecting the cylinder axis CL1, and a mounting groove bottom surface 70c formed parallel to the cylinder axis CL1. Furthermore, a first restricting portion 70d is provided at the corner between the mounting groove bottom surface 70c and the cylinder bore bottom side surface 70b, and a second restricting portion 70e is provided at the corner between the mounting groove bottom surface 70c and the cylinder bore opening side surface 70a.
  • the first restricting portion 70d is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 70, gradually decreases from the mounting groove bottom surface 70c toward the cylinder bore bottom side surface 70b.
  • the second restricting portion 70e is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 70, gradually decreases from the mounting groove bottom surface 70c toward the cylinder bore opening side surface 70a.
  • the length dimension W5 of the mounting groove bottom surface 70c in the cylinder axial direction is formed to be the same dimension as the length dimension W5 of the outer peripheral surface 10a of the dust seal 10 in the cylinder axial direction.
  • the leading end surface 10b on the outer peripheral side of the dust seal 10 abuts against the second restricting portion 70e, and the rear end surface 10c on the outer peripheral side of the dust seal 10 abuts against the first restricting portion 70d, restricting the movement of the dust seal 10 in the cylinder axial direction.
  • the rear end surface 10c is spaced apart from the cylinder bore bottom side surface 70b, forming a first separation portion E7 between the rear end surface 10c and the cylinder bore bottom side surface 70b.
  • the leading end surface 10b is spaced apart from the cylinder bore opening side surface 70a, forming a second separation portion E8 between the leading end surface 10b and the cylinder bore opening side surface 70a.
  • Fig. 9 shows an eighth embodiment of the present invention, in which the dust seal mounting groove 80 has a cylinder bore opening side surface 80a, a cylinder bore bottom side surface 80b, and a mounting groove bottom surface 80c.
  • the cylinder bore opening side surface 80a is formed in a direction intersecting the cylinder axis CL1
  • the mounting groove bottom surface 80c is formed parallel to the cylinder axis CL1.
  • the cylinder hole bottom side surface 80b constitutes the first regulating portion, and is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 80, gradually decreases from the mounting groove bottom surface 80c toward the cylinder hole bottom side surface 80b.
  • a second restricting portion 80d is provided at the corner between the cylinder hole opening side surface 80a and the mounting groove bottom surface 80c.
  • the second restricting portion 80d is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 80, gradually decreases from the mounting groove bottom surface 80c toward the cylinder hole opening side surface 80a.
  • the length dimension W6 in the cylinder axial direction of the mounting groove bottom surface 80c is formed to be the same as the length dimension W6 in the cylinder axial direction of the outer peripheral surface 10a of the dust seal 10.
  • the leading end surface 10b on the outer peripheral side of the dust seal 10 abuts against the second restricting portion 80d
  • the rear end surface 10c on the outer peripheral side of the dust seal 10 abuts against the cylinder bore bottom side surface 80b (first restricting portion), restricting the movement of the dust seal 10 in the cylinder axial direction.
  • the rear end surface 10c is spaced apart from the cylinder bore bottom side surface 80b, forming a first separation portion E9 between the rear end surface 10c and the cylinder bore bottom side surface 80b.
  • the leading end surface 10b is spaced apart from the cylinder bore opening side surface 80a, forming a second separation portion E10 between the leading end surface 10b and the cylinder bore opening side surface 80a.
  • Figure 10 shows a ninth embodiment of the present invention, in which the dust seal mounting groove 90 has a cylinder bore opening side surface 90a, a cylinder bore bottom side surface 90b, and a mounting groove bottom surface 90c.
  • the cylinder bore bottom side surface 90b is formed in a direction intersecting the cylinder axis CL1
  • the mounting groove bottom surface 90c is formed parallel to the cylinder axis CL1.
  • the cylinder hole opening side surface 90a constitutes the first regulating portion, and is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 90, gradually decreases from the mounting groove bottom surface 90c toward the cylinder hole opening side surface 90a.
  • a second restricting portion 90d is provided at the corner between the cylinder hole bottom side surface 90b and the mounting groove bottom surface 90c.
  • the second restricting portion 90d is formed as a conical surface whose inner diameter, centered on the cylinder axis CL1 of the dust seal mounting groove 90, gradually decreases from the mounting groove bottom surface 90c toward the cylinder hole bottom side surface 90b.
  • the length dimension W7 of the bottom surface 90c of the mounting groove in the cylinder axial direction is formed to be the same as the length dimension W7 of the outer peripheral surface 10a of the dust seal 10 in the cylinder axial direction.
  • the leading end surface 10b on the outer peripheral side of the dust seal 10 abuts against the cylinder bore opening side surface 90a (first restricting portion), and the rear end surface 10c on the outer peripheral side of the dust seal 10 abuts against the second restricting portion 90d, restricting the movement of the dust seal 10 in the cylinder axial direction.
  • the rear end surface 10c is spaced apart from the cylinder bore bottom side surface 90b, forming a first separation portion E11 between the rear end surface 10c and the cylinder bore bottom side surface 90b.
  • the leading end surface 10b is spaced apart from the cylinder bore opening side surface 90a, forming a second separation portion E12 between the leading end surface 10b and the cylinder bore opening side surface 90a.
  • Figure 11 shows a tenth embodiment of the present invention, in which the dust seal mounting groove 100 has a cylinder bore opening side surface 100a and a cylinder bore bottom side surface 100b formed in a direction intersecting the cylinder axis CL1, and a mounting groove bottom surface 100c formed between the cylinder bore bottom side surface 100b and the cylinder bore opening side surface 100a.
  • the mounting groove bottom surface 100c constitutes a regulating portion, and has a first conical surface 100d in which the inner diameter centered on the cylinder axis CL1 of the dust seal mounting groove 100 gradually decreases from the cylinder axial direction center P1 of the mounting groove bottom surface 100c toward the cylinder bore bottom side surface 100b, and a second conical surface 100e in which the inner diameter centered on the cylinder axis CL1 of the dust seal mounting groove 100 gradually decreases from the cylinder axial direction center P1 of the mounting groove bottom surface 100c toward the cylinder bore opening side surface 100a.
  • the dust seal 10 is installed in the dust seal installation groove 100 by aligning the cylinder axial center with the cylinder axial center P1 of the installation groove bottom surface 100c.
  • the cylinder bore bottom side and cylinder bore opening side of the dust seal 10 are compressed between the piston 5 and the first conical surface 100d and the second conical surface 100e, and the outer peripheral surface 10a of the dust seal 10 and the mounting groove bottom surface 100c of the dust seal mounting groove 100 are in close contact with each other, restricting the movement of the dust seal 10 in the cylinder axial direction.
  • the rear end surface 10c is spaced from the cylinder bore bottom side surface 100b, and a separation portion E13 is formed between the rear end surface 10c and the cylinder bore bottom side surface 100b.
  • the front end surface 10b is spaced from the cylinder bore opening side surface 100a, and a separation portion E14 is formed between the front end surface 10b and the cylinder bore opening side surface 100a.
  • the present invention provides a restricting portion in the dust seal mounting groove, allowing the dust seal to be positioned at any position in the dust seal groove with its movement in the cylinder axial direction restricted, thereby stabilizing the amount of rollback of the piston while keeping costs down. Furthermore, the amount of rollback can be set as desired, taking into account the amount of protrusion of the dust seal during braking, which changes depending on the mounting position of the dust seal.
  • the disc brake of the present invention is not limited to the above-mentioned arrangement in which an acting part with a piston and a reaction part with a reaction claw are arranged opposite each other on both sides of the disc rotor, but may be an acting part with a piston arranged opposite each other on both sides of the disc rotor, and the number of pistons is also arbitrary.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
PCT/JP2024/023706 2023-07-10 2024-07-01 ディスクブレーキ Ceased WO2025013668A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2025532687A JPWO2025013668A1 (https=) 2023-07-10 2024-07-01
CN202480042135.6A CN121399393A (zh) 2023-07-10 2024-07-01 盘式制动器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023-112784 2023-07-10
JP2023112784 2023-07-10

Publications (1)

Publication Number Publication Date
WO2025013668A1 true WO2025013668A1 (ja) 2025-01-16

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ID=94215380

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PCT/JP2024/023706 Ceased WO2025013668A1 (ja) 2023-07-10 2024-07-01 ディスクブレーキ

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JP (1) JPWO2025013668A1 (https=)
CN (1) CN121399393A (https=)
WO (1) WO2025013668A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006097816A (ja) * 2004-09-30 2006-04-13 Nissin Kogyo Co Ltd 液圧式車両用ディスクブレーキ
JP2011214623A (ja) * 2010-03-31 2011-10-27 Hitachi Automotive Systems Ltd ディスクブレーキ
JP6567926B2 (ja) 2014-09-16 2019-08-28 日信工業株式会社 車両用ディスクブレーキ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006097816A (ja) * 2004-09-30 2006-04-13 Nissin Kogyo Co Ltd 液圧式車両用ディスクブレーキ
JP2011214623A (ja) * 2010-03-31 2011-10-27 Hitachi Automotive Systems Ltd ディスクブレーキ
JP6567926B2 (ja) 2014-09-16 2019-08-28 日信工業株式会社 車両用ディスクブレーキ

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JPWO2025013668A1 (https=) 2025-01-16
CN121399393A (zh) 2026-01-23

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