Disc brake device and assembly method thereof

Abstract

To provide a disc brake device which can secure concentricity between multiple rotary members and multiple output members and secure sealability between a caliper and a housing.SOLUTION: In a disc brake device, a caliper-side restriction portion 31, disposed non-coaxially with a spindle 36a, configured to serve as a reference of a position of the spindle 36a, and provided at a caliper 2, and a housing-side restriction portion 75, disposed non-coaxially with an output shaft 51a, configured to serve as a reference of a position of the output shaft 51a, and provided at a housing 48, are brought into contact with each other to restrict a position of the housing 48 relative to the caliper 2. An annular seal 6a arranged coaxially with the spindle 36a is sandwiched in an axial direction between the caliper 2 and the housing 48.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to a disc brake device and a method for assembling the same. [Background technology]

[0002] Disc brake devices are increasingly being used not only on the front wheels of automobiles but also on the rear wheels, due to their excellent heat dissipation properties and the ability to finely adjust braking force while driving.

[0003] Disc brake devices can be broadly divided into hydraulic disc brake devices that use hydraulic fluid to generate braking force, and electric disc brake devices that use an electrically driven actuator to generate braking force.

[0004] As an electric disc brake device, an electric parking brake type structure is known, as disclosed in Patent Publication No. 2020-118166 (Patent Document 1), in which the braking force of the service brake is generated by pumping brake oil (fluid) into a cylinder, and the braking force of the parking brake is generated by driving an electric actuator such as a rotary-to-linear conversion mechanism with an electric motor.

[0005] FIG. 26 shows an electric parking type disc brake device 100 described in Japanese Patent Application Laid-Open No. 2020-118166.

[0006] The disc brake device 100 is a floating type disc brake device, and includes a support 101 fixed to a suspension device, and a caliper 102 supported on the support 101 so as to be movable in the axial direction of a rotor (not shown).

[0007] An outer pad 103a and an inner pad 103b are supported by the support 101 so as to be movable in the axial direction of the rotor.

[0008] The caliper 102 is provided with a cylinder 104. A piston 105 is fitted inside the cylinder 104.

[0009] A rotary-to-linear motion conversion mechanism 106 is disposed inside the piston 105 and presses the piston 105 when braking force is applied by the parking brake. The rotary-to-linear motion conversion mechanism 106 has a spindle 107, which is a rotating member, and a nut 108, which is a linear motion member. The rotary-to-linear motion conversion mechanism 106 is driven by a motor gear unit 109.

[0010] The motor gear unit 109 includes a housing 110 , an electric motor (not shown), and an output shaft 111 .

[0011] The housing 110 is fixed to the caliper 102 by bolts (not shown), and houses an electric motor, an output shaft 111, and the like.

[0012] The output shaft 111 is disposed coaxially with the spindle 107 that constitutes the rotary-to-linear motion conversion mechanism 106, and is connected to an end of the spindle 107 so as to be able to transmit torque. A final gear that constitutes a reduction mechanism such as a gear-type reducer is fixed to the output shaft 111. Therefore, the output shaft 111 is rotated by the electric motor, and transmits the rotation of the electric motor to the spindle 107.

[0013] The gap between the caliper 102 and the housing 110 is sealed by an O-ring 112. The O-ring 112 is disposed in a spigot fitting portion 113 between the caliper 102 and the housing 110. Specifically, the O-ring 112 is sandwiched in the radial direction of the spigot fitting portion 113 between the outer peripheral surface of a fitting shaft portion 114 provided in the caliper 102 and the inner peripheral surface of a fitting hole portion 115 provided in the housing 110.

[0014] In the disc brake device 100 of the conventional structure, the fitting shaft portion 114 and the spindle 107 are arranged coaxially, and the fitting hole portion 115 and the output shaft 111 are arranged coaxially. As a result, by fitting the fitting shaft portion 114 and the fitting hole portion 115 together, the housing 110 is positioned relative to the caliper 102 and the coaxiality of the spindle 107 and the output shaft 111 is ensured.

[0015] When the service brake is operated by the disc brake device 100 having a conventional structure, brake oil is sent to the cylinder 104 provided in the caliper 102 through an oil passage (not shown). This pushes the piston 105 out of the cylinder 104, pressing the inner pad 103b against the inner surface of the rotor. The reaction force caused by the pressing also displaces the caliper 102 inward in the axial direction of the rotor relative to the support 101. The caliper 102 then presses the outer pad 103a against the outer surface of the rotor. As a result, braking force is generated by friction acting on the contact surfaces between the outer pad 103a and the inner pad 103b and the rotor.

[0016] On the other hand, to activate the parking brake using the disc brake device 100, the electric motor is driven to rotate in a predetermined direction to rotate the output shaft 111. When the rotation is transmitted to the output shaft 111, the piston 105 is pushed toward the rotor via the rotary-to-linear motion conversion mechanism 106, thereby pressing the inner pad 103b against the inner surface of the rotor. Furthermore, the reaction force generated by the pressing force displaces the caliper 102 inward in the axial direction of the rotor relative to the support 101. The caliper 102 then presses the outer pad 103a against the outer surface of the rotor. As a result, braking force is generated by the parking brake due to friction acting on the contact surfaces between the outer pad 103a and the inner pad 103b and the rotor. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] Japanese Patent Publication No. 2020-118166 [Patent Document 2] U.S. Patent Application Publication No. 2020 / 0309214 Summary of the Invention [Problem to be solved by the invention]

[0018] As disclosed in U.S. Patent Application Publication No. 2020 / 0309214 (Patent Document 2), in electric parking type disc brake devices mounted on large vehicles such as trucks and commercial vehicles, pads are pressed simultaneously by multiple pistons to obtain a large braking force.

[0019] In an electric parking type disc brake device having a configuration in which pads are pressed simultaneously by multiple pistons, the rotating members constituting the rotary-to-linear motion conversion mechanism arranged inside each of the multiple cylinders and the multiple output members housed in the housing of the motor gear unit must be arranged coaxially with each other and connected so as to be able to transmit torque.

[0020] In order to arrange multiple rotating members and multiple output members coaxially, it is conceivable to use spigot fittings, as in the conventional structure described in JP 2020-118166 A. Specifically, it is conceivable to provide the same number of spigot fittings as the number of rotating members and output members, and to arrange the fitting shaft and rotating member coaxially for each spigot fitting, and also to arrange the fitting hole and output member coaxially.

[0021] However, when multiple spigot fittings are provided, it becomes difficult to precisely match the size of the clearance between the outer circumferential surface of the fitting shaft and the inner circumferential surface of the fitting hole at all of the spigot fittings. Therefore, the positioning of the housing relative to the caliper is performed based on the spigot fitting with the smallest clearance. Therefore, while it is possible to ensure coaxiality between the rotating member and the output member whose position is restricted based on the spigot fitting with the smallest clearance, it becomes difficult to ensure coaxiality between the rotating member and the output member whose position is restricted based on the other spigot fittings. This can result in problems such as a decrease in the conversion efficiency of the rotary-to-linear motion conversion mechanism.

[0022] Furthermore, when a configuration is adopted in which an O-ring is clamped radially around each of the multiple spigot fittings, it becomes difficult to make the interference of the O-ring uniform over the entire circumference for the spigot fittings other than the one with the smallest clearance, making it difficult to ensure a tight seal between the caliper and the housing.

[0023] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a disc brake device that can ensure coaxiality between multiple rotating members and multiple output members, and can ensure sealing between the caliper and the housing. [Means for solving the problem]

[0024] A disc brake device according to one aspect of the present disclosure includes a caliper, a plurality of pistons, a plurality of rotary-to-linear motion conversion mechanisms, a motor gear unit, a plurality of annular seals, a position restriction means, and a fixing means. The caliper has a plurality of cylinders axially inward of the rotor. The plurality of pistons are fitted in the plurality of cylinders, respectively. The multiple rotary-to-linear motion conversion mechanisms are arranged within the multiple cylinders and convert rotational motion into linear motion to push each of the multiple pistons toward the rotor, and are composed of a rotating member and a linear motion member. The motor gear unit has an electric motor, a plurality of output members, the same number as the rotating members, that are arranged coaxially with the rotating members and transmit the rotation of the electric motor to the rotating members, and a housing that accommodates the electric motor and the plurality of output members, and is supported and fixed to the caliper. The plurality of annular seals are provided in the same number as the rotary members, are arranged coaxially with the rotary members, and provide a seal between the caliper and the housing. The position restricting means restricts the position of the motor gear unit relative to the caliper. The fixing means fixes the caliper and the housing together. The output member is not particularly limited as long as it is connectable to the rotating member and rotatable around its own central axis, and an output shaft, an output gear, an output pulley, etc. can be used.

[0025] In the disc brake device according to one aspect of the present disclosure, the annular seal is axially sandwiched between the caliper and the housing. The position regulating means has at least one or more caliper side regulating portions provided on the caliper that are arranged non-coaxially with the rotating member and serve as a reference for the position of the rotating member, and at least one or more housing side regulating portions provided on the housing that are arranged non-coaxially with the output member and serve as a reference for the position of the output member, and regulates the position of the housing relative to the caliper by abutting the caliper side regulating portions and the housing side regulating portions.

[0026] In a disc brake device according to one aspect of the present disclosure, the caliper side regulating portion can have one or more curved or flat caliper side regulating surfaces, and the housing side regulating portion can have one or more curved or flat housing side regulating surfaces. The caliper-side restricting portion and the housing-side restricting portion can be brought into contact with each other by the caliper-side restricting surface and the housing-side restricting surface. The curved surface includes a cylindrical surface, a spherical surface, a parabolic surface, and the like.

[0027] In a disc brake device according to one aspect of the present disclosure, either the caliper side regulating portion or the housing side regulating portion can have one or more regulating corner portions, and the other of the caliper side regulating portion or the housing side regulating portion can have one or more curved or flat regulating surfaces. The caliper-side restricting portion and the housing-side restricting portion can be brought into contact with each other by the restricting corner portion and the restricting surface.

[0028] The disc brake device according to one aspect of the present disclosure may include two of the caliper-side restricting portions and two of the housing-side restricting portions.

[0029] In a disc brake device according to one embodiment of the present disclosure, the circumferential and radial positions of the first caliper side regulating portion and the first housing side regulating portion can be regulated by abutment between a first caliper side regulating portion of the two caliper side regulating portions and a first housing side regulating portion of the two housing side regulating portions, and the relative rotational position of the caliper and the housing around the central axis of the first caliper side regulating portion or the first housing side regulating portion can be regulated by abutment between a second caliper side regulating portion of the two caliper side regulating portions and a second housing side regulating portion of the two housing side regulating portions.

[0030] In the disc brake device according to one aspect of the present disclosure, the second caliper-side restricting portion and the second housing-side restricting portion may abut against each other in a circumferential direction or a radial direction.

[0031] In the disc brake device according to one aspect of the present disclosure, the caliper-side restricting portion may have a convex shape that protrudes in the axial direction. In this case, the caliper-side restricting portion can be configured as a pin member that is configured separately from the caliper and fixed to the caliper. Furthermore, when the caliper-side restricting portion is configured as a separate body from the caliper, the caliper-side restricting portion can be disposed between the caliper and the housing in the axial direction.

[0032] In the disc brake device according to one aspect of the present disclosure, the housing-side restricting portion can be configured integrally with the housing. In this case, the housing-side restricting portion can be provided on a part of a reinforcing rib that is integral with the housing. Furthermore, when the housing-side restricting portion is configured integrally with the housing, the housing-side restricting portion may have a recessed shape recessed in the axial direction.

[0033] In the disc brake device according to one aspect of the present disclosure, the housing-side restricting portion can be configured as a pin member that is configured separately from the housing and fixed to the housing by molding.

[0034] In the disc brake device according to one aspect of the present disclosure, the fixing means may be a bolt.

[0035] A method for assembling a disc brake device according to one aspect of the present disclosure includes a step of abutting the caliper side regulating portion and the housing side regulating portion by utilizing gravity acting on the housing or the caliper when assembling the disc brake device according to one aspect of the present disclosure.

[0036] A method for assembling a disc brake device according to one aspect of the present disclosure, when assembling a disc brake device according to one aspect of the present disclosure that uses the bolt as the fixing means, includes a step of abutting the caliper side regulating portion against the housing side regulating portion by utilizing the rotational force acting on the housing or the caliper from the bolt when tightening the bolt. [Effects of the Invention]

[0037] According to one aspect of the disc brake device of the present disclosure, it is possible to realize a disc brake device that can ensure coaxiality between multiple rotating members and multiple output members, and can also ensure sealing between the caliper and the housing. [Brief explanation of the drawings]

[0038] [Figure 1] FIG. 1 is a front view of a disc brake device according to a first embodiment, as viewed from the axially outer side (outside the vehicle body). [Figure 2] FIG. 2 is a rear view of the disc brake device according to the first example of the embodiment, as viewed from the axially inner side (the center side of the vehicle body). [Figure 3] FIG. 3 is a plan view of the disc brake device according to the first embodiment, as viewed from the outside in the radial direction. [Figure 4] FIG. 4 is a bottom view of the disc brake device according to the first embodiment, as viewed from the radially inner side. [Figure 5] FIG. 5 is a perspective view of the disc brake device according to the first embodiment, as viewed from the axially outer side and the radially outer side. [Figure 6] FIG. 6 is a cross-sectional view taken along line AA in FIG. [Figure 7] FIG. 7 is a partially enlarged view of FIG. [Figure 8] FIG. 8 is a partially cutaway side view of the disc brake device according to the first example of the embodiment, as viewed from one circumferential side. [Figure 9] FIG. 9 is a partially enlarged view of FIG. [Figure 10] FIG. 10 is a rear view of the disc brake device according to the first embodiment, seen from the axially inner side with the motor gear unit removed. [Figure 11] FIG. 11 is a perspective view of the disc brake device according to the first example of the embodiment, seen from the axially inner side and the radially outer side, with the motor gear unit removed. [Figure 12] FIG. 12 is a front view of the motor gear unit constituting the disc brake device of the first example of the embodiment, taken out and viewed from the outside in the axial direction. [Figure 13] FIG. 13 is a perspective view of a motor gear unit constituting a disc brake device according to a first example of the embodiment, taken out and viewed from the axially outer side and the radially outer side. [Figure 14] FIG. 14 is a perspective view showing a motor gear unit constituting the disc brake device of the first example of the embodiment, with the housing omitted. [Figure 15] FIG. 15 is a schematic diagram showing a speed reduction mechanism constituting the disc brake device of the first example of the embodiment. [Figure 16] FIG. 16 is a schematic cross-sectional view showing a position restriction means according to a first example of the embodiment. [Figure 17] FIG. 17 is a schematic cross-sectional view of a portion corresponding to a part of FIG. 9, showing a second example of the embodiment. [Figure 18] FIG. 18 is a schematic diagram showing a disc brake device according to a third example of the embodiment, with the motor gear unit removed from the caliper. [Figure 19] FIG. 19 is a diagram corresponding to FIG. 16 and shows a fourth example of the embodiment. [Figure 20] FIG. 20 is a diagram corresponding to FIG. 16, showing a fifth example of the embodiment. [Figure 21] FIG. 21 is a diagram showing a sixth example of the embodiment, and corresponds to FIG. [Figure 22] FIG. 22 is a diagram showing a seventh example of the embodiment, and corresponds to FIG. [Figure 23]FIG. 23 is a diagram showing an eighth example of the embodiment, and corresponds to FIG. [Figure 24] FIG. 24 is a diagram showing a ninth example of the embodiment, corresponding to FIG. [Figure 25] FIG. 25 is a diagram showing a tenth example of the embodiment, and corresponds to FIG. [Figure 26] FIG. 26 is a cross-sectional view showing a disc brake device of a conventional structure. DETAILED DESCRIPTION OF THE INVENTION

[0039] [First example of embodiment] A first example of the embodiment will be described with reference to FIGS.

[0040] [Overall configuration of disc brake device] The disc brake device 1 of this embodiment is an electric parking brake type disc brake device, and has both a function as a hydraulic service brake and a function as an electric parking brake.

[0041] The disc brake device 1 includes a caliper 2, a plurality of pistons 3a, 3b, a plurality of rotary-to-linear motion conversion mechanisms 4a, 4b, a motor gear unit 5, a plurality of annular seals 6a, 6b, a position restriction means 7, and a fixing means 8.

[0042] The disc brake device 1 of this embodiment is a floating type disc brake device, and further includes a support 9, an outer pad 10a, and an inner pad 10b.

[0043] The disc brake device 1 of this example is installed in a relatively large vehicle. For this reason, the disc brake device 1 includes two each of the pistons 3a, 3b, rotary-to-linear motion conversion mechanisms 4a, 4b, and annular seals 6a, 6b, but may include three or more of each.

[0044] The disc brake device 1 obtains braking force from the service brake by feeding brake oil (pressurized oil), which is hydraulic fluid, to the first cylinder 18a and the second cylinder 18b provided in the caliper 2. In contrast, the disc brake device 1 obtains braking force from the parking brake by driving the rotary-to-linear motion conversion mechanisms 4a and 4b with the motor gear unit 5, without using hydraulic fluid.

[0045] The motor gear unit 5 is fixed to the caliper 2 by fixing means 8, with its position relative to the caliper 2 being restricted by position restricting means 7. A plurality of annular seals 6a, 6b seal the gap between the caliper 2 and a housing 48 (described below) that constitutes the motor gear unit 5. In this way, the disc brake device 1 of this example is separately equipped with the position restricting means 7 for restricting the position of the motor gear unit 5 relative to the caliper 2, and the fixing means 8 for fixing the motor gear unit 5 to the caliper 2.

[0046] In the following description of the disc brake device 1, the axial direction, circumferential direction, and radial direction refer to the axial direction, circumferential direction, and radial direction of a disc-shaped rotor 11 (see FIG. 3) that rotates with the wheel, unless otherwise specified. The front-to-back direction in FIGS. 1, 2, 10, 12, and 16, the up-and-down direction in FIGS. 3, 4, 6, and 7, and the left-to-right direction in FIGS. 8 and 9 correspond to the axial direction, and the center side of the vehicle body when mounted on the vehicle body is referred to as the axially inner side, and the outside of the vehicle body when mounted on the vehicle body is referred to as the axially outer side. Furthermore, the left-to-right direction in FIGS. 1 to 4, 6, 7, 10, 12, and 16, and the front-to-back direction in FIGS. 8 and 9 correspond to the circumferential direction, respectively. 1, 3, 6, 7, 12, and 16 and the left sides of 2, 4, and 10 correspond to one circumferential side, and the left sides of 1, 3, 6, 7, 12, and 16 and the right sides of 2, 4, and 10 correspond to the other circumferential side. The up-and-down direction in 1, 2, 8-10, 12, and 16 and the front-to-back direction in 3, 4, 6, and 7 correspond to the radial direction, and the upper sides in 1, 2, 8-10, 12, and 16 are the radially outer side, and the lower sides in 1, 2, 8-10, 12, and 16 are the radially inner side.

[0047] <support> The support 9 is a casting made of an iron-based alloy such as cast iron, and includes a support base 12 arranged axially inside the rotor 11, an outer connecting portion 13 arranged axially outside the rotor 11, and a pair of connecting arms 14a, 14b that axially connect both outer circumferential ends of the support base 12 to both outer circumferential ends of the outer connecting portion 13. A guide hole (not shown) that opens axially inward is formed in the radially outer portion of each of the connecting arms 14a, 14b. The support 9 is fixed to a suspension system that constitutes a vehicle body using multiple (four in the illustrated example) mounting holes 15 formed in the radially inner portion of the support base 12.

[0048] In the disc brake device 1 of this example, with the support 9 fixed to the suspension, the connecting arm 14a on one circumferential side is disposed on the upper side in the vertical direction, and the connecting arm 14b on the other circumferential side is disposed on the lower side in the vertical direction. However, the assembling direction of the disc brake device 1 is not particularly important.

[0049] <Outer pad and inner pad> The outer pad 10a and the inner pad 10b are arranged on both axial sides of the rotor 11 so as to sandwich the rotor 11 from both sides in the axial direction. The outer pad 10a is arranged on the axial outside of the rotor 11 and is supported by the support 9 so as to be movable in the axial direction. The inner pad 10b is arranged on the axial inside of the rotor 11 and is supported by the support 9 so as to be movable in the axial direction.

[0050] Each of the outer pad 10a and the inner pad 10b includes a lining 16 and a metal back plate 17 that supports the back surface of the lining 16.

[0051] Caliper The caliper 2 is made of an aluminum alloy or an iron alloy, and has an inverted U shape when viewed in the circumferential direction.

[0052] The caliper 2 has a clamp base 19 equipped with a plurality of cylinders 18a, 18b, located axially inward of the rotor 11, and a pressing portion 20 located axially outward of the rotor 11. The clamp base 19 and the pressing portion 20 are connected in the axial direction. The clamp base 19 also has a pair of arms 21a, 21b at both circumferential ends.

[0053] The caliper 2 is supported by the guide pins 22a and 22b so as to be displaceable in the axial direction relative to the support 9. For this purpose, the axially inner ends of the guide pins 22a and 22b are fixed to the arm portions 21a and 21b, and the axially outer ends or intermediate portions of the guide pins 22a and 22b are inserted into guide holes provided in the connecting arm portions 14a and 14b of the support 9 so as to be capable of relative displacement in the axial direction.

[0054] In this example, the caliper 2 has two cylinders: a first cylinder 18a and a second cylinder 18b.

[0055] Each of the first cylinder 18a and the second cylinder 18b is a substantially cylindrical space that opens to the axially outer surface of the clamp base 19. The axially inner ends of the first cylinder 18a and the second cylinder 18b are closed by bottoms 23a and 23b, respectively. However, the bottoms 23a and 23b are provided with insertion holes 24a and 24b for inserting the axially inner ends of spindles 36a and 36b, which will be described later.

[0056] In this example, the motor gear unit 5 is fixed to the axially inner side of the caliper 2. Therefore, the clamp base 19 has a housing-facing surface 25 on its axially inner side.

[0057] Insertion holes 24a, 24b open in housing-opposing surface 25. Annular protrusions 26a, 26b are provided around insertion holes 24a, 24b in housing-opposing surface 25. The protrusions are arranged coaxially with the central axes of insertion holes 24a, 24b and extend slightly inward in the axial direction. Annular surfaces 27a, 27b are provided around annular protrusions 26a, 26b. Annular surface 27a is a flat surface that exists on an imaginary plane perpendicular to the central axis of first cylinder 18a, and annular surface 27b is a flat surface that exists on an imaginary plane perpendicular to the central axis of second cylinder 18b.

[0058] In this example, in order to fix the motor gear unit 5 to the caliper 2, the clamp base 19 is provided with a plurality of (three in the illustrated example) mounting flanges 28a to 28c.

[0059] Of the mounting flanges 28a to 28c, the two mounting flanges 28a, 28b provided on the radially outer side of the clamp base 19 are configured in a tongue-like plate shape. The mounting flanges 28a, 28b are arranged spaced apart in the circumferential direction and each extend radially outward.

[0060] The mounting flange 28a on one circumferential side is disposed radially outward from the first cylinder 18a, and the mounting flange 28b on the other circumferential side is disposed radially outward from the second cylinder 18b. Through holes 29a, 29b are provided on the radially outer sides of the mounting flanges 28a, 28b, respectively. Mounting bolts 74a, 74b (described below), which serve as fixing means 8, are loosely inserted axially through the through holes 29a, 29b, respectively.

[0061] Of the mounting flanges 28a to 28c, mounting flange 28c provided on the radially inner side of clamp base 19 is configured in a triangular plate shape. Mounting flange 28c is disposed between first cylinder 18a and second cylinder 18b in the circumferential direction and extends radially inward. Mounting flange 28c is provided with an internally threaded hole 30. A mounting bolt 74c (described below) serving as fixing means 8 is threaded into the internally threaded hole 30.

[0062] The axially inner surfaces of the mounting flanges 28a to 28c form the housing-opposing surface 25.

[0063] The caliper 2 has a plurality of caliper-side regulating portions 31, 32 that constitute the position regulating means 7 in order to regulate the position of the motor gear unit 5 relative to the caliper 2. In this example, the caliper 2 has two caliper-side regulating portions: a first caliper-side regulating portion 31 and a second caliper-side regulating portion 32.

[0064] Each of the first caliper side regulating portion 31 and the second caliper side regulating portion 32 is made of a pin member having a cylindrical shape, and is configured separately from the caliper 2 and fixed to the caliper 2. The diameter of each of the first caliper side regulating portion 31 and the second caliper side regulating portion 32 is constant over their entire length. In this example, parts having the same diameter but different overall lengths are used as the first caliper side regulating portion 31 and the second caliper side regulating portion 32, but it is also possible to use common parts that are equal in both diameter and overall length. It is also possible to use parts that are different in both diameter and overall length.

[0065] The first caliper side regulating portion 31 and the second caliper side regulating portion 32 are fixed to the mounting flanges 28a, 28b, respectively. Specifically, the first caliper side regulating portion 31 and the second caliper side regulating portion 32 are fixed to the mounting flanges 28a, 28b by press-fitting their respective axially outer halves into fixing holes 33 formed in the radially middle portions of the mounting flanges 28a, 28b. The axially inner halves of the first caliper side regulating portion 31 and the second caliper side regulating portion 32 protrude in the axial direction from the axially inner surfaces of the mounting flanges 28a, 28b and have a convex shape. In addition to press-fitting, other methods such as adhesive fixing and crimping can also be used to fix the caliper side regulating portions to the caliper.

[0066] Each of the first caliper side regulating portion 31 and the second caliper side regulating portion 32 has one convex cylindrical (curved) caliper side regulating surface 34a, 34b on the outer surface of the portion protruding axially from the axial inner surface of the mounting flanges 28a, 28b.

[0067] The first caliper side regulating portion 31 and the second caliper side regulating portion 32 are fixed to the radially middle portion of the mounting flanges 28a, 28b, respectively, and are therefore arranged non-coaxially with the first spindle 36a (described later) arranged coaxially with the first cylinder 18a within the first cylinder 18a, and the second spindle 36b (described later) arranged coaxially with the second cylinder 18b within the second cylinder 18b.

[0068] In this example, the circumferential and radial positions of the second caliper side regulating portion 32 are regulated based on the position of the first caliper side regulating portion 31, and the circumferential and radial positions of the respective central axes of the first cylinder 18a and the second cylinder 18b are regulated.

[0069] The first caliper side restricting portion 31 and the second caliper side restricting portion 32 are arranged to be spaced apart in the circumferential direction. The central axes of the first caliper side restricting portion 31 and the second caliper side restricting portion 32 are arranged to be parallel to each other.

[0070] A virtual line O perpendicular to the central axes of the first caliper side restricting portion 31 and the second caliper side restricting portion 32 A is a virtual line O perpendicular to the central axes of the first cylinder 18a and the second cylinder 18b. 18 is placed parallel to the

[0071] Furthermore, the first caliper-side restricting portion 31 is disposed on the other circumferential side of an imaginary line connecting the central axis of the through-hole 29a of the mounting flange 28a and the central axis of the first cylinder 18a, and the second caliper-side restricting portion 32 is disposed on one circumferential side of an imaginary line connecting the central axis of the through-hole 29b of the mounting flange 28b and the central axis of the second cylinder 18b. However, the first caliper-side restricting portion 31 may also be disposed on the imaginary line connecting the central axis of the through-hole 29a and the central axis of the first cylinder 18a or on one circumferential side of the imaginary line, and the second caliper-side restricting portion 32 may also be disposed on the imaginary line connecting the central axis of the through-hole 29b and the central axis of the second cylinder 18b or on the other circumferential side of the imaginary line.

[0072] In this example, the first caliper side regulating portion 31 and the second caliper side regulating portion 32 are configured separately from the caliper 2 and fixed to the caliper 2, but two or one caliper side regulating portion can also be configured integrally with the caliper.

[0073] <piston> The disc brake device 1 of this example includes two pistons: a first piston 3a and a second piston 3b. The first piston 3a is fitted into a first cylinder 18a. The second piston 3b is fitted into a second cylinder 18b. Each of the first piston 3a and the second piston 3b is made of carbon steel such as S10C or S45C, and is configured in a cylindrical shape with a bottom.

[0074] The inner peripheral surfaces of the first piston 3a and the second piston 3b are provided with female splines 35a, 35b, respectively. The axially outer ends of the first piston 3a and the second piston 3b are prevented from rotating relative to the back plate 17 of the inner pad 10b by a rotation prevention mechanism (not shown). Piston boots are fitted between the axially outer portion of the outer peripheral surface of the first piston 3a and the axially outer opening edge of the first cylinder 18a, and between the axially outer portion of the outer peripheral surface of the second piston 3b and the axially outer opening edge of the second cylinder 18b.

[0075] <Rotary-to-linear motion conversion mechanism> The disc brake device 1 of this example includes two rotary-to-linear motion conversion mechanisms: a first rotary-to-linear motion conversion mechanism 4a and a second rotary-to-linear motion conversion mechanism 4b. Each of the first rotary-to-linear motion conversion mechanism 4a and the second rotary-to-linear motion conversion mechanism 4b is a feed screw mechanism that converts rotary motion into linear motion and changes the overall axial length when activated.

[0076] The first rotary-to-linear motion conversion mechanism 4a is disposed within the first cylinder 18a and pushes the first piston 3a toward the rotor 11. The first rotary-to-linear motion conversion mechanism 4a includes a first spindle 36a corresponding to the rotating member, a first nut 37a corresponding to the linear motion member, and a plurality of balls 38a. The first spindle 36a and the first nut 37a are disposed coaxially with the first cylinder 18a.

[0077] The second rotary-to-linear motion conversion mechanism 4b is disposed in the second cylinder 18b and pushes the second piston 3b toward the rotor 11. The second rotary-to-linear motion conversion mechanism 4b includes a second spindle 36b corresponding to the rotating member, a second nut 37b corresponding to the linear motion member, and a plurality of balls 38b. The second spindle 36b and the second nut 37b are disposed coaxially with the second cylinder 18b. Therefore, the first spindle 36a and the second spindle 36b are disposed parallel to each other.

[0078] In this example, the circumferential and radial positions of the respective central axes of the first cylinder 18a and the second cylinder 18b are regulated based on the position of the first caliper side regulating portion 31, and therefore the circumferential and radial positions of the first spindle 36a arranged coaxially with the first cylinder 18a and the second spindle 36b arranged coaxially with the second cylinder 18b are also regulated based on the position of the first caliper side regulating portion 31.

[0079] Each of the first spindle 36a and the second spindle 36b has a large-diameter shaft portion 39a, 39b in its axially outer half and a small-diameter shaft portion 40a, 40b in its axially inner half. The outer peripheral surfaces of the large-diameter shaft portions 39a, 39b are provided with helical shaft-side thread grooves. The axially intermediate portions of the small-diameter shaft portions 40a, 40b are inserted through insertion holes 24a, 24b formed in the bottom portions 23a, 23b of the clamp base 19. Therefore, the axially inner portions of the small-diameter shaft portions 40a, 40b protrude axially inward from the clamp base 19. Male serrations 41a, 41b are formed on the outer peripheral surfaces of the axially inner portions of the small-diameter shaft portions 40a, 40b.

[0080] Bearing rings 42a, 42b and thrust bearings 43a, 43b are fitted onto the axially outer sides of the small diameter shaft portions 40a, 40b, respectively. The bearing rings 42a, 42b and thrust bearings 43a, 43b are axially sandwiched between the large diameter shaft portions 39a, 39b and the bottom portions 23a, 23b of the clamp base 19. This allows the bottom portions 23a, 23b to support thrust loads acting on the first spindle 36a and the second spindle 36b, and also enables the first spindle 36a and the second spindle 36b to rotate relative to the bottom portions 23a, 23b.

[0081] Each of the first nut 37a and the second nut 37b has a spiral nut-side screw groove on its inner circumferential surface and male splines 44a, 44b on its outer circumferential surface.

[0082] The first nut 37a is disposed inside the first piston 3a, and the male splines 44a on its outer circumferential surface are spline-engaged with the female splines 35a provided on the first piston 3a. This allows the first nut 37a to be displaced relative to the first piston 3a in the axial direction but prevents relative rotation. The second nut 37b is disposed inside the second piston 3b, and the male splines 44b on its outer circumferential surface are spline-engaged with the female splines 35b provided on the second piston 3b. This allows the second nut 37b to be displaced relative to the second piston 3b in the axial direction but prevents relative rotation.

[0083] The balls 38a, 38b are rollably disposed inside a spiral load path formed between the shaft-side screw groove and the nut-side screw groove. The start and end points of the load path are connected by a circulation path.

[0084] The first rotary-to-linear motion conversion mechanism 4a and the second rotary-to-linear motion conversion mechanism 4b rotate the first spindle 36a and the second spindle 36b, thereby moving the first nut 37a and the second nut 37b in the axial direction. Specifically, when the first spindle 36a and the second spindle 36b are rotated in the forward direction, the first nut 37a and the second nut 37b are moved in a direction approaching the rotor 11 (outward in the axial direction). In contrast, when the first spindle 36a and the second spindle 36b are rotated in the reverse direction, the first nut 37a and the second nut 37b are moved in a direction away from the rotor 11 (inward in the axial direction). Note that a sliding-type feed screw device that does not use balls may also be used as the first rotary-to-linear motion conversion mechanism 4a and the second rotary-to-linear motion conversion mechanism 4b.

[0085] <Motor gear unit> The motor gear unit (MGU, electric drive device) 5 is used to electrically drive the first rotary-linear motion conversion mechanism 4a and the second rotary-linear motion conversion mechanism 4b, and is equipped with an electric motor 45, a reduction mechanism 46 including a first output shaft 51a and a second output shaft 51b, a non-excitation operated brake 47, and a housing 48.

[0086] Electric motor The electric motor 45 has a motor body 49 and a motor shaft 50. Note that Fig. 15 shows a schematic diagram of the motor body 49 and the motor shaft 50, which are components of the electric motor 45.

[0087] Both axial ends of the motor shaft 50 protrude in both axial directions from the motor body 49. A reduction mechanism 46 is connected to one axial end of the motor shaft 50. On the other hand, a power-off brake 47 is connected to the other axial end of the motor shaft 50.

[0088] 《Reduction mechanism》 The reduction mechanism 46 increases the torque (power) of the electric motor 45 and transmits it to the first rotary-to-linear motion conversion mechanism 4a and the second rotary-to-linear motion conversion mechanism 4b.

[0089] The reduction mechanism 46 includes output shafts 51a and 51b, which correspond to output members, and the number of which is the same as the number of spindles 36a and 36b, in order to transmit the rotation of the electric motor 45 to the first spindle 36a and the second spindle 36b, respectively.

[0090] In this example, there are provided two output shafts: a first output shaft 51a and a second output shaft 51b. The first output shaft 51a is disposed coaxially with the first spindle 36a and is rotatably supported inside the housing 48. The second output shaft 51b is disposed coaxially with the second spindle 36b and is rotatably supported inside the housing 48.

[0091] The first output shaft 51a and the second output shaft 51b have serration holes 52a and 52b at their axially outer ends, respectively. The serration holes 52a and 52b open to the axially outer end faces of the first output shaft 51a and the second output shaft 51b, respectively.

[0092] The axially inner end of the first spindle 36a is inserted into the serration hole 52a of the first output shaft 51a. This allows serration engagement between the serration hole 52a and the male serrations 41a provided on the first spindle 36a, connecting the first output shaft 51a and the first spindle 36a so that they cannot rotate relative to each other. Furthermore, the axially inner end of the second spindle 36b is inserted into the serration hole 52b of the second output shaft 51b. This allows serration engagement between the serration hole 52b and the male serrations 41b provided on the second spindle 36b, connecting the second output shaft 51b and the second spindle 36b so that they cannot rotate relative to each other.

[0093] The reduction gear mechanism 46 of this example further includes a worm reduction gear mechanism 53, a power distribution mechanism (differential) 54, a plurality of gears (spur gears) 55a to 55e, and a plurality of transmission shafts 56a, 56b. The plurality of transmission shafts 56a, 56b are rotatably supported inside the housing 48. Note that Fig. 15 schematically shows a portion of the components of the reduction gear mechanism 46, namely, the worm reduction gear mechanism 53, the power distribution mechanism 54, the plurality of gears 55a to 55e, and the transmission shafts 56a, 56b.

[0094] The worm reduction mechanism 53 is connected to one axial end of the motor shaft 50. The worm reduction mechanism 53 is made up of a worm 57 and a worm wheel 58, and does not have a self-locking function.

[0095] The worm 57 is disposed coaxially with the motor shaft 50 and is connected to one axial end of the motor shaft 50 so as to be non-rotatable relative to the motor shaft 50 .

[0096] The worm wheel 58 is fixed to the transmission shaft 56 a so as not to be rotatable relative to the transmission shaft 56 a, and is engaged with the worm 57 .

[0097] A first gear 55a is fixedly fitted onto the transmission shaft 56a at a portion axially offset from the worm wheel 58 so as to be non-rotatable relative to the shaft. The first gear 55a is meshed with a second gear 55b which is fixedly fitted onto the transmission shaft 56b at a portion axially offset from the second gear 55b so as to be non-rotatable relative to the shaft. A third gear 55c, which has fewer teeth than the second gear 55b, is fixedly fitted onto the transmission shaft 56b at a portion axially offset from the second gear 55b so as to be non-rotatable relative to the shaft. The third gear 55c is meshed with an input element 60 which constitutes the power distribution mechanism 54.

[0098] A fourth gear 55d, which is the final gear, is fitted and fixed to the outside of the first output shaft 51a, and a fifth gear 55e, which is the final gear, is fitted and fixed to the outside of the second output shaft 51b. The fourth gear 55d is in mesh with a first output element 62 (to be described later) that constitutes the power distribution mechanism 54, and the fifth gear 55e is in mesh with a second output element 63 (to be described later) that constitutes the power distribution mechanism 54.

[0099] The power distribution mechanism 54 has a support shaft 59, an input element 60, intermediate gears 61a and 61b, a first output element 62, and a second output element 63. The input element 60, the first output element 62, and the second output element 63 are also gears having teeth on their outer circumferential surfaces.

[0100] The input element 60 has a pair of support rings 64a, 64b, each having an annular shape, and a plurality of pins 65a, 65b spanning between the support rings 64a, 64b. Teeth that mesh with the third gear 55c are provided on the outer circumferential surface of one of the support rings 64a. A second output element 63 is inserted into the inside of one of the support rings 64a. A first output element 62 is inserted into the inside of the other support ring 64b. The pins 65a, 65b are arranged parallel to the support shaft 59.

[0101] The intermediate gears 61a and 61b are rotatably supported with respect to the input element 60. Specifically, the intermediate gears 61a and 61b are rotatably supported around pins 65a and 65b, and are disposed between a pair of support rings 64a and 64b. The intermediate gears 61a and 61b mesh with each other.

[0102] The first output element 62 is formed in a hollow cylindrical shape and is rotatably supported around the support shaft 59. The first output element 62 has input teeth 62a and output teeth 62b. The input teeth 62a mesh with one of the intermediate gears 61a. On the other hand, the output teeth 62b mesh with the fourth gear 55d, which is the final gear and is fixed to the outside of the first output shaft 51a so as not to rotate relative to it.

[0103] The second output element 63 is formed in a hollow cylindrical shape and is rotatably supported around the support shaft 59. The second output element 63 has input teeth 63a and output teeth 63b. The input teeth 63a mesh with the other intermediate gear 61b. On the other hand, the output teeth 63b mesh with a fifth gear 55e, which is the final gear and is fixed to the outside of the second output shaft 51b so as not to rotate relative to it.

[0104] Therefore, the rotation of the first output element 62 is transmitted to the first output shaft 51a through the meshing portion between the output teeth portion 62b and the fourth gear 55d, which is the final gear. Also, the rotation of the second output element 63 is transmitted to the second output shaft 51b through the meshing portion between the output teeth portion 63b and the fifth gear 55e, which is the final gear.

[0105] The power distribution mechanism 54 distributes and transmits the power input to the input element 60 to a fourth gear 55d, which is the final gear and is fixed to the first output shaft 51a so as not to rotate relative to the first output shaft 51a, and a fifth gear 55e, which is the final gear and is fixed to the second output shaft 51b so as not to rotate relative to the second output shaft 51b. Specifically, the power distribution mechanism 54 distributes power to the fourth gear 55d and the fifth gear 55e in accordance with the magnitude of the rotational load (ease of rotation) of the first spindle 36a and the second spindle 36b. This prevents a difference from occurring between the force with which the first piston 3a presses the inner pad 10b by the first rotary-to-linear motion conversion mechanism 4a and the force with which the second piston 3b presses the inner pad 10b by the second rotary-to-linear motion conversion mechanism 4b, regardless of the difference in efficiency between the first rotary-to-linear motion conversion mechanism 4a and the second rotary-to-linear motion conversion mechanism 4b.

[0106] <<Non-excitation actuated brake>> The non-excitation actuation type brake 47 is connected to the other axial end of the motor shaft 50. The non-excitation actuation type brake 47 is a friction brake that allows the motor shaft 50 to rotate when energized and prevents the motor shaft 50 from rotating when de-energized.

[0107] "housing" The housing 48 is made of synthetic resin or metal, and houses the electric motor 45, the reduction mechanism 46, and the non-excitation actuated brake 47 therein.

[0108] The housing 48 is fixed to the axially inner side of the clamp base 19 that constitutes the caliper 2. Therefore, the housing 48 has a caliper-facing surface 66 on its axially outer side.

[0109] The caliper-opposing surface 66 has insertion holes 67a, 67b at portions that face the axially outer end faces of the first output shaft 51a and the second output shaft 51b.

[0110] The caliper-opposing surface 66 has annular recesses 68a, 68b around the insertion holes 67a, 67b, which are arranged coaxially with the central axes of the insertion holes 67a, 67b and are slightly recessed axially inward. The bottom surface of the annular recess 68a has a circular ring shape and is a flat surface that exists on an imaginary plane that is perpendicular to the central axis of the first output shaft 51a. The bottom surface of the annular recess 68b has a circular ring shape and is a flat surface that exists on an imaginary plane that is perpendicular to the central axis of the second output shaft 51b.

[0111] The caliper-facing surface 66 has reinforcing ribs 69 in a portion that is radially outward of the annular recesses 68a, 68a and in a portion that is circumferentially between the annular recesses 68a, 68b. In this example, by providing the reinforcing ribs 69 in the housing 48, it is possible to achieve both a reduction in weight of the housing 48 and an increase in its rigidity.

[0112] The portions of the reinforcing rib 69 that are located radially outward of the annular recesses 68a, 68a have a lattice shape and are made up of a plurality of first reinforcing plates 70a and a plurality of second reinforcing plates 70b.

[0113] The first reinforcing plates 70a each extend in the circumferential direction and are arranged parallel to one another at a distance in the radial direction. The second reinforcing plates 70b each extend in the radial direction and are arranged parallel to one another at a distance in the circumferential direction. The second reinforcing plates 70b are arranged perpendicular to the first reinforcing plates 70a and connect the two first reinforcing plates 70a arranged at a distance in the radial direction.

[0114] The interval between adjacent first reinforcing plates 70a in the radial direction is sufficiently larger than the diameter of the first caliper side restricting portion 31 and the second caliper side restricting portion 32. In addition, the interval between adjacent second reinforcing plates 70b in the circumferential direction is sufficiently larger than the diameter of the first caliper side restricting portion 31 and the second caliper side restricting portion 32.

[0115] The caliper-facing surface 66 has two cylindrical portions 71a, 71b at both circumferential ends of the radially outer end of the reinforcing rib 69. The caliper-facing surface 66 also has a cylindrical portion 71c at a radially inner portion between the annular recesses 68a, 68b in the circumferential direction. The cylindrical portions 71a to 71c protrude axially outward beyond the reinforcing rib 69. In this example, with the housing 48 fixed to the caliper 2, only the axially outer end faces of the cylindrical portions 71a to 71c abut against the housing-facing surface 25, except for the abutment portion between the first caliper-side restricting portion 31 and a first housing-side restricting portion 75 (described later) and the abutment portion between the second caliper-side restricting portion 32 and a second housing-side restricting portion 76 (described later).

[0116] The two cylindrical portions 71a, 71b arranged radially outward have female threaded holes 72a, 72b on their respective inner circumferential surfaces. In contrast, the one cylindrical portion 71c arranged radially inward has a through hole 73 on its inner side. The female threaded holes 72a, 72b and the through hole 73 open to the caliper-opposing surface 66.

[0117] The housing 48 is fixed to the axially inner side of the clamp base 19 of the caliper 2 by using mounting bolts 74a to 74c, each of which constitutes the fixing means 8. Specifically, mounting bolts 74a and 74b are inserted through holes 29a and 29b formed in the mounting flanges 28a and 28b of the caliper 2 from the axially outer side to the axially inner side and are screwed into the female threaded holes 72a and 72b of the housing 48, and a mounting bolt 74c is inserted through a through hole 73 of the housing 48 from the axially inner side to the axially outer side and is screwed into the female threaded hole 30 formed in the mounting flange 28c of the caliper 2. In this way, the housing 48 is fixed to the axially inner side of the clamp base 19.

[0118] In this example, the mounting bolts 74a and 74b are loosely inserted into the through holes 29a and 29b of the mounting flanges 28a and 28b, and the mounting bolt 74c is loosely inserted into the through hole 73 of the housing 48. For this reason, the position of the housing 48 relative to the caliper 2 cannot be strictly restricted by the mounting bolts 74a to 74c.

[0119] The housing 48 has a plurality of housing-side regulating portions 75, 76 that constitute the position regulating means 7 to regulate the position of the motor gear unit 5 relative to the caliper 2. In this example, the housing 48 has two housing-side regulating portions: a first housing-side regulating portion 75 and a second housing-side regulating portion 76.

[0120] The first housing side restricting portion 75 and the second housing side restricting portion 76 are each configured integrally with the housing 48. Specifically, the first housing side restricting portion 75 and the second housing side restricting portion 76 are each provided on a part of the reinforcing rib 69. Therefore, the first housing side restricting portion 75 and the second housing side restricting portion 76 are each disposed non-coaxially with the first output shaft 51a and the second output shaft 51b, respectively.

[0121] The first housing-side restricting portion 75 is composed of a first reinforcing plate 70a located radially between the annular recess 68a located on one circumferential side and the cylindrical portion 71a, and a second reinforcing plate 70b whose radially outer end is connected to the circumferential end of the first reinforcing plate 70a. Therefore, the first housing-side restricting portion 75 is configured in an L-shaped plate shape, and has a flat housing-side restricting surface 77a on its radially inner side and a flat housing-side restricting surface 77b on its side facing the other circumferential side. In other words, the first housing-side restricting portion 75 has two flat housing-side restricting surfaces 77a, 77b. The two housing-side restricting surfaces 77a, 77b are connected at right angles to each other.

[0122] In contrast, the second housing-side restricting portion 76 is composed only of a first reinforcing plate 70a located radially between the cylindrical portion 71b and the annular recess 68b located on the other circumferential side. Therefore, the second housing-side restricting portion 76 is configured in a flat plate shape and has a flat housing-side restricting surface 77c on its radially inner surface. In other words, the second housing-side restricting portion 76 has one flat housing-side restricting surface 77c.

[0123] The housing-side restricting surface 77a of the first housing-side restricting portion 75 and the housing-side restricting surface 77c of the second housing-side restricting portion 76 are on the same imaginary plane, and are aligned along an imaginary line O perpendicular to the central axes of the first output shaft 51a and the second output shaft 51b. 51 is parallel to

[0124] In this example, the circumferential and radial positions of the first output shaft 51a and the second output shaft 51b, which are rotatably supported inside the housing 48, are regulated based on the position of the first housing side regulating portion 75, i.e., the radial position of the housing side regulating surface 77a and the circumferential position of the housing side regulating surface 77b.

[0125] In this example, before the housing 48 is fixed to the caliper 2 by the fixing means 8, the position of the housing 48 relative to the caliper 2 is regulated by the position regulating means 7.

[0126] Specifically, when the caliper opposing surface 66 is placed on the housing opposing surface 25, the radially outer end of the convex cylindrical caliper-side restricting surface 34a of the first caliper-side restricting portion 31 abuts against the flat housing-side restricting surface 77a of the first housing-side restricting portion 75, and the circumferential end of the convex cylindrical caliper-side restricting surface 34a of the first caliper-side restricting portion 31 abuts against the flat housing-side restricting surface 77b of the first housing-side restricting portion 75. This restricts the circumferential and radial positions of the first caliper-side restricting portion 31 and the first housing-side restricting portion 75. In other words, the circumferential and radial positions of the first caliper-side restricting portion 31 and the first housing-side restricting portion 75 are aligned. The first caliper-side restricting portion 31 and the first housing-side restricting portion 75 are used as reference points for position restriction.

[0127] Furthermore, from the state where the first caliper-side restricting portion 31 and the first housing-side restricting portion 75 are in contact with each other, the radially outer end of the convex cylindrical caliper-side restricting surface 34b of the second caliper-side restricting portion 32 is brought into contact with the flat housing-side restricting surface 77c of the second housing-side restricting portion 76. That is, in this example, the caliper-side restricting surface 34b and the housing-side restricting surface 77c are brought into contact with each other in the radial direction. As a result, the central axis O of the first caliper-side restricting portion 31, which is the reference point, is adjusted. 31 This restricts the relative rotational position (rotational phase) between the caliper 2 and the housing 48. In this example, the position of the housing 48 relative to the caliper 2 is restricted in this manner.

[0128] In this example, the orientation of the housing 48 is restricted so that the radially inner portion of the housing 48 faces downward in the vertical direction, and the caliper opposing surface 66 is then placed on the housing opposing surface 25. This allows the first caliper side restricting portion 31 to abut against the first housing side restricting portion 75, and the second caliper side restricting portion 32 to abut against the second housing side restricting portion 76, by utilizing gravity acting on the housing 48. Then, with the first caliper side restricting portion 31 and the first housing side restricting portion 75 abutting against each other and the second caliper side restricting portion 32 to abut against the second housing side restricting portion 76, the housing 48 is fixed to the caliper 2 by the fixing means 8.

[0129] Alternatively, when tightening the mounting bolts 74a, 74b, the rotational force (moment force) acting on the housing 48 from the mounting bolts 74a, 74b can be utilized, or when tightening the mounting bolt 74c, the rotational force acting on the caliper 2 from the mounting bolt 74c can be utilized to abut the first caliper side regulating portion 31 and the first housing side regulating portion 75, and also to abut the second caliper side regulating portion 32 and the second housing side regulating portion 76.

[0130] In this example, a first annular seal 6a and a second annular seal 6b are disposed between the housing opposing surface 25 and the caliper opposing surface 66 to seal between the caliper 2 and the housing 48.

[0131] In this example, the first annular seal 6a is disposed coaxially with the first spindle 36a and is elastically sandwiched in the axial direction between the annular surface 27a of the housing-facing surface 25 and the bottom surface of the annular recess 68a of the caliper-facing surface 66. The second annular seal 6b is disposed coaxially with the second spindle 36b and is elastically sandwiched in the axial direction between the annular surface 27b of the housing-facing surface 25 and the bottom surface of the annular recess 68b of the caliper-facing surface 66. This provides a seal between the caliper 2 and the housing 48.

[0132] [Explanation of disc brake device operation] When the service brake is activated by the disc brake device 1 of this embodiment, brake oil is supplied to the first cylinder 18a and the second cylinder 18b through an oil passage (not shown). This pushes the first piston 3a and the second piston 3b out of the first cylinder 18a and the second cylinder 18b, pressing the inner pad 10b against the axially inner surface of the rotor 11. The reaction force generated by this pushing force displaces the caliper 2 axially inward relative to the support 9. The pressing portion 20 of the caliper 2 then presses the outer pad 10a against the axially outer surface of the rotor 11. This generates braking force due to friction acting on the contact surfaces between the outer pad 10a and the inner pad 10b and the rotor 11. In this way, the disc brake device 1 generates braking force by the service brake by introducing brake oil to push the first piston 3a and the second piston 3b.

[0133] When the parking brake is activated by the disc brake device 1, the electric motor 45 constituting the motor gear unit 5 is energized to rotate the first spindle 36a and the second spindle 36b in the forward direction via the reduction gear mechanism 46. This moves the first nut 37a and the second nut 37b axially outward. The first piston 3a and the second piston 3b are then pushed toward the rotor 11, thereby pressing the inner pad 10b against the axially inner surface of the rotor 11. The reaction force generated by the pressing force displaces the caliper 2 axially inward relative to the support 9. The pressing portion 20 of the caliper 2 then presses the outer pad 10a against the axially outer surface of the rotor 11. This generates a braking force due to friction acting on the contact surfaces between the inner pad 10b and the outer pad 10a and the rotor 11. In this way, the disc brake device 1 generates a braking force by applying the parking brake by using the motor gear unit 5 to push the first piston 3a and the second piston 3b.

[0134] Furthermore, when the vehicle engine is stopped and the power supply to the electric motor 45 is stopped, the power supply to the electromagnetic coil that constitutes the power-off actuation type brake 47 is stopped. This makes it possible for the power-off actuation type brake 47 to prevent rotation of the motor shaft 50. Therefore, the disc brake device 1 of this example can maintain the braking force of the parking brake even when the power supply to the electric motor 45 is stopped.

[0135] According to the disc brake device 1 of this example, the coaxiality between the first spindle 36a and the first output shaft 51a, and the coaxiality between the second spindle 36b and the second output shaft 51b can be ensured, and sealing between the caliper 2 and the housing 48 can be ensured.

[0136] That is, in this example, before the housing 48 is fixed to the caliper 2, the first caliper side regulating portion 31 and the first housing side regulating portion 75 are brought into contact with each other, thereby regulating the circumferential and radial positions of the first caliper side regulating portion 31 and the first housing side regulating portion 75. In other words, the circumferential and radial positions of the first caliper side regulating portion 31 and the first housing side regulating portion 75 are made to coincide with each other. Furthermore, from this state, the second caliper side regulating portion 32 and the second housing side regulating portion 76 are brought into contact with each other, thereby regulating the central axis O of the first caliper side regulating portion 31, which serves as a reference point. 31 This restricts the relative rotational position between the caliper 2 and the housing 48. As a result, in this example, the position of the housing 48 with respect to the caliper 2 (circumferential position, radial position, and relative rotational position) can be strictly restricted.

[0137] In addition, in this example, the position (circumferential position and radial position) of the central axis of each of the first spindle 36a and the second spindle 36b is regulated based on the position of the first caliper side regulating portion 31, and the position (circumferential position and radial position) of the central axis of each of the first output shaft 51a and the second output shaft 51b is regulated based on the position of the first housing side regulating portion 75.

[0138] Therefore, according to the disc brake device 1 of this embodiment, it is possible to ensure the coaxiality between the first spindle 36a and the first output shaft 51a, and the coaxiality between the second spindle 36b and the second output shaft 51b. This prevents a decrease in the conversion efficiency of the first rotary-to-linear motion conversion mechanism 4a and the second rotary-to-linear motion conversion mechanism 4b. It also prevents abnormal wear of each sliding part. Furthermore, it is possible to prevent brake oil leakage.

[0139] In this example, the first annular seal 6a is disposed coaxially with the first spindle 36a and is elastically sandwiched in the axial direction between the annular surface 27a of the housing-facing surface 25 and the bottom surface of the annular recess 68a of the caliper-facing surface 66. The second annular seal 6b is disposed coaxially with the second spindle 36b and is elastically sandwiched in the axial direction between the annular surface 27b of the housing-facing surface 25 and the bottom surface of the annular recess 68b of the caliper-facing surface 66. Therefore, the first annular seal 6a and the second annular seal 6b can seal the gap between the caliper 2 and the housing 48. Specifically, foreign matter can be prevented from entering the inside of the first cylinder 18a and the second cylinder 18b through the insertion holes 24a, 24b opening in the housing-facing surface 25, and foreign matter can be prevented from entering the inside of the housing 48 through the insertion holes 67a, 67 opening in the caliper-facing surface 66. In particular, in this example, the first annular seal 6a is sandwiched in the axial direction between the annular surface 27a and the bottom surface of the annular recess 68a, and is not disposed in a spigot-fit portion. Similarly, the second annular seal 6b is sandwiched in the axial direction between the annular surface 27b and the bottom surface of the annular recess 68b, and is not disposed in a spigot-fit portion. Therefore, by ensuring the flatness of the annular surface 27a and the bottom surface of the annular recess 68a that sandwich the first annular seal 6a, and the flatness of the annular surface 27b and the bottom surface of the annular recess 68b that sandwich the second annular seal 6b, it is possible to make the interference of the first annular seal 6a and the second annular seal 6b uniform over the entire circumference, independently of ensuring the coaxiality between the first spindle 36a and the first output shaft 51a and the coaxiality between the second spindle 36b and the second output shaft 51b, and thus improving design freedom.

[0140] In this example, a portion of the reinforcing rib 69 provided on the housing 48 is used as the first housing side regulating portion 75 and the second housing side regulating portion 76, thereby suppressing an increase in the number of parts and reducing the weight of the disc brake device 1.

[0141] Furthermore, in this example, the axially outer half of each of the first caliper side restricting portion 31 and the second caliper side restricting portion 32 is inserted into the inside of a recess 79 that exists between reinforcing ribs 69 provided on the caliper opposing surface 66. This makes it possible to prevent the axial dimension of the disc brake device 1 from becoming larger due to the provision of the position restricting means 7.

[0142] Furthermore, the first caliper side restricting portion 31 and the second caliper side restricting portion 32 have cylindrical caliper side restricting surfaces 34a and 34b, respectively, which eliminates restrictions on the phase when inserting the first caliper side restricting portion 31 and the second caliper side restricting portion 32 into the fixing hole 33, thereby reducing assembly costs.

[0143] Furthermore, in this example, gravity acting on the housing 48 can be used to bring the first caliper-side restricting portion 31 and the first housing-side restricting portion 75 into contact with each other, and the second caliper-side restricting portion 32 and the second housing-side restricting portion 76 into contact with each other, thereby preventing improper contact and reducing the number of assembly steps. Furthermore, the rotational force generated when tightening the mounting bolts 74a to 74c can be used to bring the first caliper-side restricting portion 31 and the first housing-side restricting portion 75 into contact with each other, and / or the second caliper-side restricting portion 32 and the second housing-side restricting portion 76 into contact with each other. This also reduces the number of assembly steps.

[0144] [Second Example of Implementation] A second example of the embodiment will be described with reference to FIG.

[0145] In this example, the inner diameter of the fixing hole 33a formed in the caliper 2 is varied in stages, thereby providing a stepped surface 80 on the inner peripheral surface of the fixing hole 33a. The axially outer end faces of the first caliper side restricting portion 31 (and the second caliper side restricting portion 32) abut against the stepped surface 80. Note that it is also possible to employ a configuration in which the fixing hole is a blind hole and the end face of the caliper side restricting portion abuts against the bottom surface of the fixing hole.

[0146] In addition, the axially inner end face of the first caliper side regulating portion 31 (and the second caliper side regulating portion 32) is opposed to the bottom surface 79a of a recess 79 provided in the portion between the diagonal grid-shaped reinforcing ribs 69 on the caliper opposing surface 66.

[0147] In this way, in this example, the first caliper side restricting portion 31 (and the second caliper side restricting portion 32) is sandwiched between the step surface 80 and the bottom surface 79a of the recessed portion 79 from both sides in the axial direction.

[0148] In the above-described example, the step surface 80 and the bottom surface 79a of the recess 79 can effectively prevent the first caliper side regulating portion 31 (and the second caliper side regulating portion 32) from coming out of the fixing hole 33a in the axial direction. The other configurations and effects are the same as those of the first embodiment.

[0149] [Third example of embodiment] A third example of the embodiment will be described with reference to FIG.

[0150] In this example, only the structure of the position regulating means 7 is changed from the structure of the first example of the embodiment. Specifically, the first caliper side regulating portion 31a and the second caliper side regulating portion 32a provided on the housing opposing surface 25 each have a concave shape recessed in the axial direction, and the first housing side regulating portion 75a and the second housing side regulating portion 76a provided on the caliper opposing surface 66 each have a convex shape protruding in the axial direction.

[0151] In this example, the first caliper-side regulating portion 31a and the second caliper-side regulating portion 32a are each formed directly on the caliper 2. In contrast, the first housing-side regulating portion 75a and the second housing-side regulating portion 76a are each formed separately from the housing 48 and are either composed of pin members molded and fixed to the housing 48, or are molded integrally with the housing 48.

[0152] In the above-described example, the first housing side regulating portion 75a and the second housing side regulating portion 76a are pin members molded and fixed to the housing 48, or are integrally molded with the housing 48, thereby reducing the cost of the disc brake device 1. The other configurations and effects are the same as those of the first embodiment.

[0153] [Fourth Example of Implementation Form] A fourth example of the embodiment will be described with reference to FIG.

[0154] In this example, only the structure of the position regulating means 7 is changed from the structure of the first example of the embodiment. Specifically, only the structures of the first housing side regulating portion 75b and the second housing side regulating portion 76b that constitute the position regulating means 7 are changed from the structure of the first example of the embodiment. The structures of the first caliper side regulating portion 31 and the second caliper side regulating portion 32 are the same as the structure of the first example of the embodiment.

[0155] In this example, each of the first housing side restricting portion 75b and the second housing side restricting portion 76b is a cylindrical recess having a recessed shape recessed in the axial direction from the caliper opposing surface 66. The inner diameter of the first housing side restricting portion 75b is slightly larger than the outer diameter of the first caliper side restricting portion 31, and the inner diameter of the second housing side restricting portion 76b is sufficiently larger than the outer diameter of the second caliper side restricting portion 32.

[0156] In this example, the first caliper-side regulating portion 31 is inserted into the first housing-side regulating portion 75b without any rattle, i.e., lightly press-fitted, so that the housing-side regulating surface 77d, which is a concave cylindrical surface (curved surface) provided on the inner peripheral surface of the first housing-side regulating portion 75b, and the caliper-side regulating surface 34a, which is a convex cylindrical surface provided on the outer peripheral surface of the first caliper-side regulating portion 31, come into contact over the entire circumference. This regulates the circumferential and radial positions of the first caliper-side regulating portion 31 and the first housing-side regulating portion 75b, respectively. In this example, since the caliper-side regulating surface 34a and the housing-side regulating surface 77d come into contact over the entire circumference, the caliper 2 and the housing 48 are aligned with each other at the center axis O of the first caliper-side regulating portion 31. 31 (or the central axis O of the first housing side restricting portion 75b) 75 ) translation is prevented in all directions except rotation about the

[0157] Furthermore, in this example, the radially outer end of the caliper-side regulating surface 34b provided on the outer peripheral surface of the second caliper-side regulating portion 32 is brought into contact with the radially outer end of the housing-side regulating surface 77e, which is a concave cylindrical surface and provided on the inner peripheral surface of the second housing-side regulating portion 76b. In other words, the housing-side regulating surface 77e and the caliper-side regulating surface 34b are brought into contact in the radial direction. This allows the central axis O of the first caliper-side regulating portion 31, which is the reference point, to be aligned with each other. 31 (or the central axis O of the first housing side restricting portion 75b) 75 ) and regulates the relative rotation position between the caliper 2 and the housing 48. The housing-side regulation surface 77e and the caliper-side regulation surface 34b can be brought into contact with each other by utilizing gravity acting on the housing 48. Furthermore, when a configuration is adopted in which the radially inner end of the caliper-side regulation surface 34b is brought into contact with the radially inner end of the housing-side regulation surface 77e, the housing-side regulation surface 77e and the caliper-side regulation surface 34b can be brought into contact with each other by utilizing gravity acting on the caliper 2.

[0158] In the above-described example, the circumferential and radial positions of the first caliper side regulating portion 31 and the first housing side regulating portion 75b can be regulated simply by inserting the first caliper side regulating portion 31 inside the first housing side regulating portion 75b, thereby improving the workability of the assembly work and reducing the assembly labor hours. The other configurations and effects are the same as those of the first embodiment.

[0159] [Fifth Example of Embodiment] A fifth example of the embodiment will be described with reference to FIG.

[0160] In this example, only the structure of the second housing-side restricting portion 76c is changed from the structure of the fourth example of the embodiment. The structures of the first caliper-side restricting portion 31, the second caliper-side restricting portion 32, and the first housing-side restricting portion 75b are the same as the structures of the fourth example of the embodiment.

[0161] In this example, the first reinforcing plate 70a constituting the reinforcing rib 69 is used as the second housing-side restricting portion 76c. The flat housing-side restricting surface 77f provided on the second housing-side restricting portion 76c is abutted against the radially outer end of the caliper-side restricting surface 34b provided on the outer peripheral surface of the second caliper-side restricting portion 32. As a result, the central axis O of the first caliper-side restricting portion 31, which is the reference point, 31 (or the central axis O of the first housing side restricting portion 75b) 75 ) and regulates the relative rotation position between the caliper 2 and the housing 48. In this example as well, the housing-side regulation surface 77f and the caliper-side regulation surface 34b can be brought into contact with each other by utilizing gravity acting on the housing 48.

[0162] In the present example as described above, a part of the reinforcing rib 69 can be used as the second housing side restricting portion 76c, thereby reducing costs. The other configurations and effects are the same as those of the first and fourth embodiments.

[0163] [Sixth Example of Embodiment] A sixth example of the embodiment will be described with reference to FIG.

[0164] In this example, only the structure of the first housing-side restricting portion 75c is changed from the structure of the fifth example of the embodiment. The structures of the first caliper-side restricting portion 31, the second caliper-side restricting portion 32, and the second housing-side restricting portion 76c are the same as the structures of the fifth example of the embodiment.

[0165] In this example, the first housing-side restricting portion 75c is a square recess or a square hole having a concave shape recessed in the axial direction from the caliper-opposing surface 66. The first housing-side restricting portion 75c has two flat housing-side restricting surfaces 77g and 77h on its inner circumferential surface. The two housing-side restricting surfaces 77g and 77h are connected to each other at a right angle.

[0166] In this example, a radially outer end of the convex cylindrical caliper-side restricting surface 34a of the first caliper-side restricting portion 31 abuts against a flat housing-side restricting surface 77g of the first housing-side restricting portion 75c, and a circumferential end of one side of the convex cylindrical caliper-side restricting surface 34a of the first caliper-side restricting portion 31 abuts against a flat housing-side restricting surface 77h of the first housing-side restricting portion 75c. This restricts the circumferential and radial positions of the first caliper-side restricting portion 31 and the first housing-side restricting portion 75c, respectively.

[0167] In the present embodiment, the first housing restriction portion 75c is a square recess or a square hole, so that the first housing restriction portion 75c can be easily formed by injection molding or press working, thereby reducing the processing cost of the first housing restriction portion 75c. The other configurations and effects are the same as those of the first and fifth embodiments.

[0168] [Seventh Example of Embodiment] A seventh example of the embodiment will be described with reference to FIG.

[0169] In this example, only the structure of the first housing-side restricting portion 75d is changed from the structure of the fifth example of the embodiment. The structures of the first caliper-side restricting portion 31, the second caliper-side restricting portion 32, and the second housing-side restricting portion 76c are the same as the structures of the fifth example of the embodiment.

[0170] In this example, the first housing-side restricting portion 75d is a triangular recess or triangular hole having a concave shape recessed in the axial direction from the caliper-opposing surface 66. The first housing-side restricting portion 75d has two flat housing-side restricting surfaces 77i, 77j on its inner circumferential surface. The two housing-side restricting surfaces 77i, 77j are connected to each other so that the included angle is acute.

[0171] In this example, the convex cylindrical caliper-side restricting surface 34a of the first caliper-side restricting portion 31 abuts against the two flat housing-side restricting surfaces 77i, 77j of the first housing-side restricting portion 75d, thereby restricting the circumferential and radial positions of the first caliper-side restricting portion 31 and the first housing-side restricting portion 75d, respectively.

[0172] In the present example as described above, with the first caliper-side restricting portion 31 inserted inside the first housing-side restricting portion 75d and the caliper-side restricting surface 34a simultaneously abutting against the two housing-side restricting surfaces 77i, 77j, it is possible to prevent the housing 48 from moving in the circumferential direction relative to the caliper 2. This improves the workability of the assembly work and reduces the number of assembly steps. The other configurations and effects are the same as those of the first and fifth embodiments.

[0173] [Eighth Example of Embodiment] An eighth example of the embodiment will be described with reference to FIG.

[0174] In this example, only the structures of the first caliper side restricting portion 31b and the second caliper side restricting portion 32b are changed from the structure of the fifth example of the embodiment. The structures of the first housing side restricting portion 75b and the second housing side restricting portion 76c are the same as the structure of the fifth example of the embodiment.

[0175] In this example, the first caliper side restricting portion 31b and the second caliper side restricting portion 32b are each a rectangular prism having a convex shape that protrudes in the axial direction from the housing opposing surface 25. The first caliper side restricting portion 31b has a caliper side restricting corner 81a connecting the radially outer surface to a side surface on one circumferential side, and also has a caliper side restricting corner 81b connecting the radially outer surface to a side surface on the other circumferential side. In contrast, the second caliper side restricting portion 32b has a flat caliper side restricting surface 34c on its radially outer surface.

[0176] In this example, by inserting the first caliper-side restricting portion 31b into the first housing-side restricting portion 75b, two caliper-side restricting corners 81a, 81b provided on the first caliper-side restricting portion 31b come into contact with a housing-side restricting surface 77d, which is a concave cylindrical surface provided on the inner peripheral surface of the first housing-side restricting portion 75b, thereby restricting the circumferential and radial positions of the first caliper-side restricting portion 31b and the first housing-side restricting portion 75b, respectively.

[0177] Furthermore, in this example, the caliper-side restricting surface 34c of the second caliper-side restricting portion 32b is brought into surface contact with the flat housing-side restricting surface 77f of the second housing-side restricting portion 76c. As a result, the central axis O of the first housing-side restricting portion 75b, which is the reference point, is aligned with the center axis O of the first housing-side restricting portion 75b. 75 The relative rotational position of the caliper 2 and the housing 48 is restricted.

[0178] In the present embodiment as described above, the caliper-side restriction surface 34c and the housing-side restriction surface 77f are in surface contact with each other, so that the relative rotational positions of the caliper 2 and the housing 48 can be strictly restricted. The other configurations and effects are the same as those of the first and fifth embodiments.

[0179] [Ninth Example of Embodiment] A ninth example of the embodiment will be described with reference to FIG.

[0180] In this example, only the structure of the first caliper side restricting portion 31c is changed from the structure of the eighth example of the embodiment. The structures of the second caliper side restricting portion 32b, the first housing side restricting portion 75b, and the second housing side restricting portion 76c are the same as the structures of the eighth example of the embodiment.

[0181] In this example, the first caliper side restricting portion 31c is a triangular prism having a convex shape that protrudes in the axial direction from the housing opposing surface 25. The first caliper side restricting portion 31c has a caliper side restricting corner 81c that connects the radially outer surface with a side surface on one circumferential side, and also has a caliper side restricting corner 81d that connects the radially outer surface with a side surface on the other circumferential side.

[0182] In this example, by inserting the first caliper-side restricting portion 31c into the first housing-side restricting portion 75b, the two caliper-side restricting corners 81c, 81d provided on the first caliper-side restricting portion 31c come into contact with a housing-side restricting surface 77d, which is a concave cylindrical surface provided on the inner circumferential surface of the first housing-side restricting portion 75b, thereby restricting the circumferential and radial positions of the first caliper-side restricting portion 31c and the first housing-side restricting portion 75b, respectively.

[0183] In this example, when the first caliper side regulating portion 31c is inserted into the first housing side regulating portion 75b, the remaining corner portion connecting the side surface on one circumferential side of the first caliper side regulating portion 31c to the side surface on the other circumferential side can also be lightly brought into contact with the housing side regulating surface 77d. The other configurations and effects are the same as those of the first and eighth embodiments.

[0184] [Tenth Example of Embodiment] A tenth example of the embodiment will be described with reference to FIG.

[0185] In this example, only the structure of the first caliper-side restricting portion 31d is changed from the structure of the eighth example of the embodiment. The structures of the second caliper-side restricting portion 32b, the first housing-side restricting portion 75b, and the second housing-side restricting portion 76c are the same as the structures of the eighth example of the embodiment.

[0186] In this example, the first caliper-side restricting portion 31d is a star-shaped prism having a convex shape that protrudes from the housing-opposing surface 25 in the axial direction.

[0187] In this example, by inserting the first caliper-side restricting portion 31d into the first housing-side restricting portion 75b, at least two caliper-side restricting corners 81e, 81f provided on the radially outer side of the first caliper-side restricting portion 31d come into contact with a housing-side restricting surface 77d, which has a concave cylindrical shape and is provided on the inner circumferential surface of the first housing-side restricting portion 75b. This restricts the circumferential and radial positions of the first caliper-side restricting portion 31d and the first housing-side restricting portion 75b, respectively.

[0188] In this example, when the first caliper side regulating portion 31d is inserted into the first housing side regulating portion 75b, other corners provided on the outer peripheral surface of the first caliper side regulating portion 31d can also be lightly brought into contact with the housing side regulating surface 77d. The other configurations and effects are the same as those of the first and eighth embodiments.

[0189] Although the embodiments of the present disclosure have been described above, the structures of the examples of the embodiments can be appropriately combined and implemented as long as no contradiction occurs.

[0190] The structures of the caliper-side restricting portion and the housing-side restricting portion that constitute the position restricting means are not limited to the structures shown in the examples of the embodiments, and can be modified as appropriate.

[0191] In each of the embodiments, the cases where two caliper-side regulating portions and two housing-side regulating portions are provided have been described, but the number of each is not limited to two. For example, as long as one caliper-side regulating portion and one housing-side regulating portion can simultaneously regulate the circumferential position, the radial position, and the relative rotational position, one caliper-side regulating portion and one housing-side regulating portion may be provided. For example, such a caliper-side regulating portion and housing-side regulating portion may have a structure in which one of the caliper-side regulating portion and the housing-side regulating portion is a prismatic shape such as a triangular prism or a square prism, and the other of the caliper-side regulating portion and the housing-side regulating portion is a prismatic recess (square hole) such as a triangular recess (triangular hole) or a square recess (square hole), so that the caliper-side regulating portion and the housing-side regulating portion fit together without a gap.

[0192] Furthermore, the installation positions of the caliper side regulating portion and the housing side regulating portion are not limited to the structures shown in the examples of the embodiments, and they can be installed at any position on the housing opposing surface and the caliper opposing surface. [Explanation of symbols]

[0193] 1 Disc brake device 2 calipers 3a First piston 3b Second piston 4a First rotary-to-linear conversion mechanism 4b Second rotary-to-linear conversion mechanism 5 Motor gear unit 6a First annular seal 6b Second annular seal 7 Position regulating means 8 Fixing means 9. Support 10a outer pad 10b inner pad 11 rotor 12 Support base 13 Outer connection part 14a, 14b connecting arm 15 Mounting holes 16 Lining 17 Back plate 18a No. 1 cylinder 18b No. 2 cylinder 19 Clamp base 20 Pressing section 21a, 21b Arms 22a, 22b Guide pins 23a, 23b bottom 24a, 24b Insertion holes 25 Housing facing surface 26a, 26b Annular convex portion 27a, 27b Circular surface 28a~28c Mounting flange 29a, 29b through hole 30 female threaded hole 31, 31a to 31d First caliper side restricting portion 32, 32a, 32b Second caliper side restricting portion 33, 33a fixing hole 34a~34c Caliper side restriction surface 35a, 35b female spline 36a First spindle 36b Second spindle 37a First Nut 37b Second nut 38a, 38b balls 39a, 39b Large diameter shaft part 40a, 40b Small diameter shaft portion 41a, 41b male serrations 42a, 42b bearing ring 43a, 43b Thrust bearings 44a, 44b male spline 45 Electric Motor 46 Reduction mechanism 47 Non-excitation operated brake 48 Housing 49 Motor body 50 motor shaft 51a 1st output shaft 51b Second output shaft 52a, 52b Serration holes 53 Worm reduction mechanism 54 Power distribution mechanism 55a~55e Gears 56a, 56b Transmission shaft 57 Warm 58 Worm Wheel 59 Support shaft 60 input elements 61a, 61b Intermediate gear 62 First output element 62a Input teeth 62b Output teeth 63 Second output element 63a Input teeth 63b Output teeth 64a, 64b Support ring 65a, 65b pins 66 Caliper opposing surface 67a, 67b insertion holes 68a, 68b Annular recess 69 Reinforcing rib 70a First reinforcing plate 70b 2nd reinforcement plate 71a~71c Cylindrical part 72a, 72b female threaded holes 73 Through Hole 74a~74c Mounting bolts 75, 75a to 75d First housing side restricting portion 76, 76a to 76c Second housing side restricting portion 77a~77i Housing side regulation surface 79 Recessed part 79a Bottom 80 Step surface 81a~81d Caliper side restricting corner 100 Disc brake device 101 Support 102 Caliper 103a Outer pad 103b Inner Pad 104 cylinders 105 Piston 106 Rotation-to-linear conversion mechanism 107 Spindle 108 Nut 109 Motor gear unit 110 Housing 111 Output shaft 112 O-ring 113 Spigot fitting part 114 mating shaft 115 fitting hole

Claims

1. a caliper having a plurality of cylinders axially inward of the rotor; a plurality of pistons fitted in the plurality of cylinders, respectively; a plurality of rotary-to-linear motion conversion mechanisms each including a rotary member and a linear motion member, each of which is disposed in each of the plurality of cylinders and converts rotary motion into linear motion to push each of the plurality of pistons toward the rotor; a motor gear unit including: an electric motor; a plurality of output members, the same number as the rotating members, that are arranged coaxially with the rotating members and transmit rotation of the electric motor to the rotating members; and a housing that accommodates the electric motor and the plurality of output members; and the motor gear unit is supported and fixed to the caliper; a plurality of annular seals, the number of which is the same as the number of the rotary members, arranged coaxially with the rotary members and sealing between the caliper and the housing; a position restricting means for restricting the position of the motor gear unit relative to the caliper; a fixing means for fixing the caliper and the housing, The annular seal is axially sandwiched between the caliper and the housing, The position regulating means has at least one or more caliper-side regulating portions provided on the caliper, which are arranged non-coaxially with the rotating member and serve as a reference for the position of the rotating member, and at least one or more housing-side regulating portions provided on the housing, which are arranged non-coaxially with the output member and serve as a reference for the position of the output member, and regulates the position of the housing relative to the caliper by abutting the caliper-side regulating portions and the housing-side regulating portions. Disc brake device.

2. The caliper-side regulating portion has one or more curved or flat caliper-side regulating surfaces, the housing-side restricting portion has one or more housing-side restricting surfaces each having a curved or flat shape; The caliper-side restricting portion and the housing-side restricting portion abut against each other via the caliper-side restricting surface and the housing-side restricting surface.

2. The disc brake device according to claim 1.

3. Either the caliper-side restricting portion or the housing-side restricting portion has one or a plurality of restricting corner portions, the other of the caliper-side regulating portion and the housing-side regulating portion has one or more regulating surfaces that are curved or flat, The caliper-side restricting portion and the housing-side restricting portion abut against each other at the restricting corner portion and the restricting surface.

2. The disc brake device according to claim 1.

4. 2. The disc brake device according to claim 1, wherein two of the caliper-side restricting portions and two of the housing-side restricting portions are provided.

5. 5. A disc brake device as described in claim 4, wherein the circumferential and radial positions of the first caliper side regulating portion and the first housing side regulating portion are regulated by abutment between a first caliper side regulating portion of the two caliper side regulating portions and a first housing side regulating portion of the two housing side regulating portions, and the relative rotational position of the caliper and the housing around the central axis of the first caliper side regulating portion or the first housing side regulating portion is regulated by abutment between a second caliper side regulating portion of the two caliper side regulating portions and a second housing side regulating portion of the two housing side regulating portions.

6. 6. The disc brake device according to claim 5, wherein the second caliper-side restricting portion and the second housing-side restricting portion abut against each other in a circumferential direction or a radial direction.

7. The disc brake device according to claim 1 , wherein the caliper-side restricting portion has a convex shape that protrudes in the axial direction.

8. 8. The disc brake device according to claim 7, wherein the caliper-side restricting portion is formed as a separate body from the caliper and is made of a pin member fixed to the caliper.

9. The disc brake device according to claim 8, wherein the caliper-side restricting portion is disposed between the caliper and the housing in the axial direction.

10. 2. The disc brake device according to claim 1, wherein the housing-side restricting portion is integrally formed with the housing.

11. 11. The disc brake device according to claim 10, wherein the housing-side restricting portion is provided on a part of a reinforcing rib that is integral with the housing.

12. The disc brake device according to claim 10, wherein the housing-side restricting portion has a recessed shape recessed in the axial direction.

13. 2. The disc brake device according to claim 1, wherein the housing-side restricting portion is formed as a separate member from the housing and is made of a pin member fixed to the housing by molding.

14. The fixing means is a bolt.

2. The disc brake device according to claim 1.

15. 2. A method for assembling the disc brake device according to claim 1, comprising the steps of: The caliper-side restricting portion and the housing-side restricting portion are brought into contact with each other by utilizing gravity acting on the housing or the caliper. A method for assembling a disc brake device.

16. A method for assembling a disc brake device according to claim 14, comprising the steps of: The caliper-side restricting portion and the housing-side restricting portion are brought into contact with each other by utilizing a rotational force acting on the housing or the caliper from the bolt when the bolt is tightened. A method for assembling a disc brake device.

Images