WO2015098780A1

WO2015098780A1 - Disc-brake device

Info

Publication number: WO2015098780A1
Application number: PCT/JP2014/083805
Authority: WO
Inventors: 雄一郎井上; 禎雄戸塚; 純一野際; 哲弥野口
Original assignee: 曙ブレーキ工業株式会社
Priority date: 2013-12-26
Filing date: 2014-12-19
Publication date: 2015-07-02
Also published as: JP2015124811A

Abstract

　A floating caliper (10) is supported so as to be capable of being displaced relative to an axial direction, while overlapping an opposing piston caliper (9) in a radial direction. A pair of pads is supported on the opposing piston caliper (9) so as to be capable of being displaced relative to the axial direction, the two pads both being shared between a service brake and a parking brake. The braking power of the service brake is generated by pressure oil being fed into both a first cylinder of the opposing piston caliper (9) and a second cylinder of the floating caliper (10), and the braking power of the parking brake is generated by a second piston fitted in the second cylinder being displaced in the axial direction by an electric pushing device (36).

Description

Disc brake device

This invention relates to a disc brake device.

The disc brake device is used as a brake device for service braking not only for the front wheels of the car but also for the rear wheels because of its excellent heat dissipation and the ability to finely adjust the braking force during driving. May be adopted. In this case, a brake device for performing the parking brake is also provided separately from the disc brake device used for the service brake. Specifically, as described in

Patent Documents

1 and 2, a drum brake device dedicated to a parking brake is disposed inside a disc brake device dedicated to a service brake (drum-in-hat structure), A structure (a twin caliper structure) is employed in which a disc brake device dedicated to a parking brake is provided separately from a disc brake device dedicated to a service brake.

FIG. 32 is a schematic diagram of a conventional structure in which a disc brake device dedicated to service brakes and a disc brake device dedicated to parking brakes are separately provided. In the case of the illustrated structure, an opposed piston type disc brake device 2 used for a service brake and a floating type disc brake device 3 used for a parking brake are provided around the rotor 1 rotating together with the wheels in a circumferentially separated state. It has been. And these two

brake devices

2 and 3 are each supported and fixed to the knuckle 4 which comprises a suspension apparatus. Specifically, a caliper 5 constituting the opposed piston type disc brake device 2 is supported and fixed to a mounting portion (stay) 6a provided on the knuckle 4, and the floating disc brake device 3 is constituted. A support 7 is supported and fixed to another mounting portion 6 b provided on the knuckle 4.
In the present specification and claims, “axial direction”, “radial direction”, and “circumferential direction” refer to “axial direction”, “radial direction”, and “circumferential direction”, respectively, related to the rotor.

In the case of the conventional structure having the above-described configuration, the opposed piston type disc brake device 2 dedicated to the service brake and the floating type disc brake device 3 dedicated to the parking brake are provided separately. For this reason, when it sees as one brake device provided with two functions, a service brake and a parking brake, it is inevitable that the whole device will be increased in size and weight. In addition, since the knuckle 4 needs to be provided with mounting

portions

6a and 6b for supporting and fixing the

brake devices

2 and 3, respectively, the degree of freedom regarding the shape of the knuckle 4 is reduced. The knuckle 4 must be provided with a mounting part for fixing the damper, a mounting part for fixing the lower arm, etc., and ensuring the degree of freedom regarding the shape of the knuckle It is important to secure the degree of freedom.

Japanese Unexamined Patent Publication No. 9-60667 Japanese Patent Laid-Open No. 2002-21892

In view of the circumstances as described above, an object of the present invention is to reduce the size and weight of a brake device having two functions of a service brake and a parking brake and improve the degree of freedom of the knuckle shape. It is to provide a disc brake device that realizes a structure.

The above object of the present invention is achieved by a disc brake device having the following configurations (1) to (7).
(1) An outer body portion and an inner body portion that are provided with a rotor that rotates together with a wheel are connected to both outer circumferential portions of the outer body portion and the inner body portion at positions radially outward from the outer peripheral edge of the rotor. And a pair (two) or more first cylinders provided opposite to each other on the outer body portion and the inner body portion, and fixed to the knuckle over the rotor. An opposed piston type caliper,
A pair of pads supported so as to be capable of displacement in the axial direction with respect to the opposed piston caliper in a state of being disposed on both sides of the rotor;
A claw portion provided on the outer side, and a second cylinder provided on the inner side and opening toward the inner side surface of the claw portion, and a portion between the pair of connecting portions in the circumferential direction A floating type caliper supported in such a manner as to be axially displaceable with respect to the opposed piston type caliper in a state straddling the pair of pads from the outside in the radial direction;
In each of the first cylinder and the second cylinder, the same number of first pistons and one second piston as the first cylinders are fitted so as to be liquid-tight and capable of displacement in the axial direction. Prepared,
The braking force by the service brake is that the pair of pads are pressed against both side surfaces of the rotor by the first pistons by the pressure oil being fed into the first cylinder and the second cylinder, respectively. Occurs when the pair of pads are pressed against both side surfaces of the rotor by the second piston and the inner side surface of the claw portion,
The brake force generated by the parking brake is generated by the second piston and the inner side surface of the claw portion only when the pair of pads are pressed against both side surfaces of the rotor.
In other words, the disc brake device having the above configuration (1) has an opposing piston type disc brake mechanism in which the braking force by the service brake includes the opposing piston type caliper and the first pistons, and the floating type caliper. Whereas the braking force by the parking brake is obtained only by the floating disc brake mechanism, it is obtained by both the floating disc brake mechanism composed of the second piston.
The number of the second cylinder and the second piston can be two or more as required.

(2) The disc brake device having the configuration of (1), wherein the second piston is displaced in the axial direction in the second cylinder using an electric motor as a drive source (for example, via a speed reducer). A disc brake device provided with an electric pressing device, wherein the braking force generated by the parking brake is generated using the electric pressing device.
(3) The disc brake device configured as described in (2) above, wherein the electric pressing device is supported by an inner side portion of the floating caliper.

(4) The disc brake device according to any one of the above (1) to (3), wherein the second cylinder is more circumferential than the at least one first cylinder provided in the inner body portion. A disc brake device arranged on the rotor entry side (the entry side when the vehicle is traveling forward) with respect to the direction.

(5) A disc brake device having any one of the constitutions (1) to (4), wherein one set of each first cylinder (two in total) is provided.

(6) The disc brake device according to any one of the above (1) to (5), wherein the floating caliper is spaced circumferentially with respect to the inner body portion constituting the opposed piston caliper. The inner body portions of the pair of guide pins that are supported in a state (including any support mode of coupling support that cannot be displaced in the axial direction and guide support that can be displaced in the axial direction) protrude toward the inner side. A disc brake device that is supported so as to be axially displaceable with respect to the opposed-piston caliper using a portion.
More specifically, at least one of the pair of guide pins is supported so as to be capable of displacement in the axial direction with respect to the floating caliper, and one or both guide pins are supported with respect to the opposed piston type caliper. Displacement in the axial direction is supported in an impossible manner.

(7) The disc brake device according to any one of the above (1) to (5), wherein the floating caliper is connected to the outer body portion and the inner body portion constituting the opposed piston caliper. A pair of guide pins supported in a state of being spanned in the direction and spaced apart in the circumferential direction are supported between the outer body part and the inner body part so as to be capable of displacement in the axial direction. Disc brake device.

According to the disc brake device of the present invention having the above-described configuration, the function of the service brake and the parking brake can be exhibited by itself. Therefore, compared with the case where each dedicated device is provided, the disc brake device can be reduced in size and weight as a whole device, and the degree of freedom of the knuckle shape can be improved.
That is, in the case of the present invention, the floating caliper constituting the floating disc brake mechanism is not supported by the dedicated support, but is opposed to the opposed piston caliper constituting the opposed piston disc brake mechanism. Thus, the opposed piston type disc brake mechanism and the floating type disc brake mechanism are integrated to form one disc brake device. In addition, in the case of the present invention, the floating caliper is disposed in a circumferential portion between a pair of connecting portions constituting the opposed piston caliper, so that the floating caliper is moved to the opposed piston. The mold caliper is supported in a state of being superimposed (mounted) in the radial direction.
For this reason, as in the case of the conventional structure shown in FIG. 32, for example, a structure in which two dedicated devices for the service brake and the parking brake are separated in the circumferential direction, or a structure that is simply continuous in the circumferential direction. In comparison, the overall size of the apparatus can be reduced (especially for the structure continuous in the circumferential direction, the overall length in the circumferential direction can be shortened).
In the case of the present invention, the support of the floating type disc brake can be omitted and the number of pistons can be reduced, so that the weight and cost of the apparatus can be reduced. Further, since only one mounting portion necessary for the knuckle is required to support and fix the opposed piston type caliper, the degree of freedom regarding the shape of the knuckle can be improved.
Furthermore, since the opposed piston type disc brake mechanism and the floating type disc brake mechanism use a pair of pads in common, the number of pads can be reduced. From this aspect, the weight and cost can be reduced. .

Moreover, since the braking force by the service brake can be obtained by operating both the opposed piston type disc brake mechanism and the floating type disc brake mechanism, the brake force of the service brake can be obtained only by the floating type disc brake device. In comparison, it is possible to improve the rise (response) of the braking force. In addition, compared with a structure in which the braking force of the service brake can be obtained only by the opposed piston type disc brake device, the braking force and the size of the device (full length in the circumferential direction) remain substantially the same, and one piston (and piston) It is possible to omit peripheral members such as seals.

FIG. 1 is a front view showing a disc brake device according to a first example of an embodiment of the present invention. FIG. 2 is a rear view of the disc brake device shown in FIG. FIG. 3 is a left side view of the disc brake device shown in FIG. FIG. 4 is a right side view of the disc brake device shown in FIG. FIG. 5 is a plan view of the disc brake device shown in FIG. 6 is a bottom view of the disc brake device shown in FIG. FIG. 7 is a perspective view showing the disk brake device shown in FIG. 1 as viewed from the outside in the radial direction and from the outer side. FIG. 8 is a perspective view showing the disc brake device shown in FIG. 1 as viewed from the radially outer side and the inner side. FIG. 9 is a perspective view showing the disc brake device shown in FIG. 1 with each piston omitted and viewed from the radially inner side and the outer side. FIG. 10 is a sectional view taken along line XX in FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. FIG. 12 is a front view showing a disc brake device of a second example of the embodiment of the present invention. 13 is a rear view of the disc brake device shown in FIG. 14 is a left side view of the disc brake device shown in FIG. 15 is a right side view of the disc brake device shown in FIG. FIG. 16 is a plan view of the disc brake device shown in FIG. 17 is a bottom view of the disc brake device shown in FIG. FIG. 18 is a perspective view showing the disc brake device shown in FIG. 12 as viewed radially outward and from the outer side. FIG. 19 is a perspective view showing the disk brake device shown in FIG. 12 as viewed from the radially outer side and the inner side. FIG. 20 is a perspective view showing the disc brake device shown in FIG. 12 with each piston omitted and viewed from the radially inner side and the outer side. FIG. 21 is a front view showing a disc brake device of a third example of the embodiment of the present invention. 22 is a rear view of the disc brake device shown in FIG. 23 is a left side view of the disc brake device shown in FIG. 24 is a right side view of the disc brake device shown in FIG. 25 is a plan view of the disc brake device shown in FIG. 25 is a bottom view of the disc brake device shown in FIG. FIG. 27 is a perspective view showing the disk brake device shown in FIG. 21 as viewed from the outside in the radial direction and from the outer side. FIG. 28 is a perspective view showing the disc brake device shown in FIG. 21 as viewed radially outward and from the inner side. FIG. 29 is a perspective view showing the disc brake device shown in FIG. 21 with each piston omitted and viewed from the radially inner side and the outer side. 30 is a cross-sectional view taken along the line XXX-XXX in FIG. 25 in which the inner pad in the disc brake device shown in FIG. 21 is omitted. FIG. 31 is a cross-sectional view taken along the line XXXI-XXXI of FIG. 25 with the outer pad omitted from the disc brake device shown in FIG. FIG. 32 is a schematic diagram showing a brake device having a conventional structure for exerting two functions of a service brake and a parking brake.

[First example of embodiment]
A first example of the embodiment of the present invention will be described with reference to FIGS. The disc brake device 8 of the first example of the present embodiment is a hybrid type having both functions of a service brake and a parking brake, and is an opposed piston type caliper 9, a floating type caliper 10, and a pair of pads 11a. 11b (outer pad 11a, inner pad 11b),

first pistons

12a, 12b (first outer piston 12a, first inner piston 12b), and second piston 13.

Of these, the opposed piston type caliper 9 is capable of moving the outer pad 11a and the inner pad 11b in the axial direction (front and back direction in FIGS. 1 and 2, the left and right direction in FIGS. 3 and 4, and the vertical direction in FIGS. 5 and 6). To support. Such an opposed piston type caliper 9 is formed by casting a light alloy such as an aluminum alloy (including die-cast molding) or the like, and has an outer body portion 14 provided with the rotor 1 (see FIG. 32) interposed therebetween, and Inner body portion 15, the outer body portion 14 and the inner body portion 15 on one side in the circumferential direction (the right side of FIGS. 1, 5, 6, the turning-in side when the vehicle moves forward) and the other end in the circumferential direction (FIG. 1, On the left side of 5 and 6, connecting

portions

16 a and 16 b that connect the ends of the vehicle when the vehicle moves forward, respectively, and a cover portion 17 are provided. The cover portion 17 is provided in a state of projecting from the connecting portion 16b on the outlet side (the other side in the circumferential direction) to the one side in the circumferential direction, and connects the outer body portion 14 and the inner body portion 15 to each other. The delivery side half of the pair of

pads

11a and 11b is covered from the radially outer side. Further, an opening 18 for arranging the floating caliper 10 is formed in a portion in the circumferential direction between the connection portion 16a on the turn-in side (one circumferential direction) and the cover portion 17.

A first outer cylinder 19a and a first inner cylinder 19b, which are the first cylinders described in the claims, are respectively connected to the inner side of the other half in the circumferential direction of the outer body portion 14 and the inner body portion 15. One (one set) is provided in each state facing each other. In the first outer cylinder 19a and the first inner cylinder 19b, a first outer piston 12a and a first inner piston 12b made of aluminum alloy, each of which is the first piston described in the claims, are oil-tight. And is fitted so as to be capable of displacement in the axial direction. In addition, at the radially outer end portion of the inner side surface of the inner body portion 15, an introduction port 20a that communicates with the first outer cylinder 19a and the first inner cylinder 19b is provided.

In addition, a pair of guides projecting in the axial direction is provided at both circumferential ends of the outer body portion 14 and the inner body portion 15 facing each other (the inner side surface of the outer body portion 14 and the outer side surface of the inner body portion 15).

Wall portions

21a and 21b are respectively provided. Further, guide

concave grooves

22a and 22b are formed in the radial direction intermediate portions on the side surfaces facing each other in the circumferential direction of the pair of

guide wall portions

21a and 21b in a direction substantially perpendicular to the both side surfaces, respectively. Yes.

In addition, a storage groove 23 that is recessed in the axial direction is formed over the entire width in the radial direction at a portion closer to one end in the circumferential direction on the inner side surface of the outer body portion 14 (portion aligned with the opening 18 in the circumferential direction). On the other hand, a relief recess 24 that is recessed radially inward is formed at the radially outer end portion of the inner body portion 15 near the one end in the circumferential direction (the portion that is aligned with the opening 18 in the circumferential direction). Yes.
Such an opposed piston type caliper 9 is supported and fixed to a mounting portion constituting the knuckle 4 (see FIG. 32) by a pair of mounting

seats

25 a and 25 b provided on the inner body portion 15. In the case of the first example of the present embodiment, the opposed piston caliper 9 and the

first pistons

12a and 12b fitted in the

first cylinders

19a and 19b are opposed to each other. A piston type disc brake mechanism is configured.

The pair of

pads

11a and 11b are composed of a lining (friction material) 26 and a metal back plate (pressure plate) 27 that supports the back surface of the lining 26. A pair of

convex ears

28a and 28b projecting from both sides in the circumferential direction are provided at the radial intermediate portions of the side edges on both sides in the circumferential direction of the back plate 27. That is, of these

ears

28a and 28b, the ear part 28a on the turn-in side is provided at the radial intermediate portion of the edge part on the turn-in side of the back plate 27 so as to protrude to the turn-in side. In addition, the delivery-side ear portion 28b is provided in a radially intermediate portion of the delivery-side edge of the back plate 27 so as to protrude to the delivery side. These

ears

28a and 28b are loosely engaged with the

guide grooves

22a and 22b, respectively. Thereby, each said

pad

11a, 11b is supported with respect to the said opposing piston type caliper 9 so that the displacement regarding an axial direction is possible.

The floating caliper 10 is made of an aluminum alloy or an iron alloy, and has a bifurcated claw portion 29 provided at the outer side end portion, a cylinder portion 30 provided at the inner side end portion, And a bridge portion 31 provided across the rotor 1 and the

pads

11a and 11b. Of these, the cylinder portion 30 is provided with one second cylinder 32 that opens toward the inner side surface of the claw portion 29. The second cylinder 13 is fitted with the second piston 13 made of an aluminum alloy or an iron alloy so as to be oil-tight and capable of axial displacement. An introduction port 20 b communicating with the second cylinder 32 is provided on the outer peripheral surface of the cylinder portion 30. In the case of the first example of the present embodiment, the diameter of the second cylinder 32 (second piston 13) is such that the first outer cylinder 19a and the first inner cylinder 19b (first outer piston 12a and first inner piston). The diameter is smaller than the diameter of the piston 12b). A pair of

arms

33a and 33b projecting in the circumferential direction are formed at the inner end of the floating caliper 10, respectively. In addition, a heat radiating window portion 42 penetrating in the radial direction is formed in the circumferential center portion of the bridge portion 31. In the case of the first example of the present embodiment, the floating type caliper 10 and the second piston 13 fitted in the second cylinder 32 constitute a floating type disc brake mechanism.

In particular, in the case of the first example of the present embodiment, the floating caliper 10 having the above-described configuration is configured such that the inner side surface of the claw portion 29 is placed on the circumferential half piece (the turn-in side half portion) of the outer pad 11a. ) With the front end surface of the second piston 13 facing the inner side surface of one half of the circumferential direction of the inner pad 11b (half of the turn-in side). Is supported so as to be capable of axial displacement.

For this reason, in the case of the first example of the present embodiment, the outer side end portion of the guide pin (reverse pin) 34a is arranged at one circumferential end portion of the inner body portion 15 constituting the opposed piston type caliper 9. It is fixed with screws. An intermediate portion of the guide pin 34a that protrudes to the inner side of the inner body portion 15 serves as a sliding portion in a guide hole formed at the tip of the arm portion 33a that protrudes to one side in the circumferential direction. It is inserted loosely to allow displacement in the axial direction. Further, with respect to the axial direction of the guide pin 34a, a portion between the inner body portion 15 and the arm portion 33a, and a bolt head portion 51 provided at an end portion on the inner side of the arm portion 33a and the guide pin 34a, The periphery of the intermediate portion is covered with a dustproof boot 35a made of an elastic material. On the other hand, a guide hole that is opened only on the inner side is formed in the axial direction at a portion near the other end in the circumferential direction of the inner body portion 15. Then, the inner side end portion (the portion adjacent to the outer side of the bolt head 51) of the guide pin (slide pin) 34b is screwed and fixed to the distal end portion of the arm portion 33b protruding to the other side in the circumferential direction. Thus, the outer side portion of the guide pin 34b serves as a sliding portion, and is loosely inserted into the guide hole so as to allow displacement in the axial direction. Further, the periphery of the portion of the guide pin 34b between the inner body portion 15 and the tip of the arm portion 33b is covered with a dustproof boot 35b. Further, in the case of the first example of the present embodiment, the guide pins 34a and 34b provided apart from each other in the circumferential direction are more circumferential than the guide pins 34a provided on one circumferential side. The guide pin 34b provided on the other side is disposed radially outward. Accordingly, even in the case of both the

arm portions

33a and 33b, the distal end portion of the arm portion 33b on the other circumferential side is disposed more radially outward than the distal end portion of the arm portion 33a on the one circumferential side. ing.

In the case of the first example of the present embodiment, with such a configuration, the floating caliper 10 is supported by the opposed piston caliper 9 so as to be capable of displacement in the axial direction. Then, in this state, the floating caliper 10 is disposed at a portion in the circumferential direction between the connecting

portions

16 a and 16 b that constitute the opposed piston caliper 9. Specifically, the claw portion 29 is disposed inside the storage groove 23 and the bridge portion 31 straddles both the

pads

11a and 11b from the outside in the radial direction. Placed in. Further, the radially inner half of the cylinder portion 30 is disposed inside the escape recess 24. Accordingly, when the floating caliper 10 is supported with respect to the opposed piston caliper 9 and the portion arranged on the inner side is viewed from the rotor 1 side, as shown in FIG. The piston 12b is placed in the delivery-side half (left half of FIG. 10), and the second piston 13 is placed in the delivery-side half (right half of FIG. 10). On the other hand, when the portion arranged on the outer side is viewed from the rotor 1 side, as shown in FIG. 11, the first outer piston 12a is placed in the delivery-side half (the right half in FIG. 11). The nail | claw part 29 will be in the state each arrange | positioned in the turn-in side half part (left half part of FIG. 11).

The disc brake device 8 of the first example of the present embodiment is provided with an electric pressing device 36 in a state assembled to the floating caliper 10. The electric pressing device 36 includes an electric motor housed in a casing 37 attached to an inner side surface (inner side portion) of the cylinder portion 30, and constituent members in the casing 37 and the cylinder portion 30. A reduction mechanism such as a gear-type reduction gear housed in the housing and a feed screw mechanism (ball screw mechanism) housed in the cylinder portion 30 for converting the rotational motion of the output shaft of the electric motor into a linear motion. Yes. Then, based on energization of the electric motor, the linear movement member constituting the feed screw mechanism is displaced in the axial direction, so that the second piston 13 fitted to the second cylinder 32 is It can be displaced in the axial direction within the two cylinders 32. That is, in the case of the first example of the present embodiment, the second piston 13 is not only displaced in the axial direction based on the introduction of hydraulic pressure, but also mechanically using the electric pressing device 36. It can be displaced in the axial direction. In other words, the floating disc brake mechanism can be operated in two ways, hydraulic and mechanical.
As the electric pressing device, for example, a structure described in Japanese Patent Application Laid-Open No. 2012-193805 or Japanese Patent Application Laid-Open No. 2011-202696 can be employed. Since the detailed structure of the electric pressing device is described in detail in these publications and the like, detailed description thereof is omitted here.

In the case of the disc brake device 8 of the first example of the present embodiment having the above-described configuration, when operating the service brake, the pressure oil is introduced into both the

inlet ports

20a and 20b of the opposed piston type caliper 9, respectively. Then, pressurized oil is fed into the first outer cylinder 19a, the first inner cylinder 19b, and the second cylinder 32, respectively. Thus, the pair of

pads

11a and 11b are pressed against both side surfaces of the rotor 1 by the first outer piston 12a and the first inner piston 12b. At the same time (substantially simultaneously), the second piston 13 is displaced in a direction approaching the rotor 1. As a result, the inner pad 11 b is pressed against the inner side surface of the rotor 1. As a reaction of the pressing, the floating caliper 10 is displaced toward the inner side with respect to the opposed piston caliper 9, and the outer pad 11 a is moved by the claw portion 29. And pressed against the outer side surface of the rotor 1. As a result, the rotor 1 is strongly pressed from both sides in the axial direction to perform braking. Thus, in the case of the first example of the present embodiment, the braking force by the service brake is obtained by both the opposed piston type disc brake mechanism and the floating type disc brake mechanism.

In contrast, when the parking brake is operated, the electric motor constituting the electric pressing device 36 is energized (pressure oil is not introduced into the

introduction ports

20a and 20b). The second piston 13 is mechanically displaced in the axial direction in the second cylinder 32 by the linear movement member constituting the feed screw mechanism being displaced in the axial direction. As a result, the inner pad 11 b is pressed against the inner side surface of the rotor 1, and the outer pad 11 a is pressed against the outer side surface of the rotor 1 by the claw portion 29. As a result, similarly to the service brake described above, the rotor 1 is clamped from both sides by the outer pad 11a and the inner pad 11b, and braking is performed. Thus, in the case of the first example of the present embodiment, the braking force by the parking brake is obtained only by the floating disc brake mechanism.

According to the disc brake device 8 of the first example of the present embodiment having the above-described configuration, since the two functions of the service brake and the parking brake can be exhibited by itself, each device is a dedicated device. Compared with the case of providing, the size and weight of the entire apparatus can be reduced, and the degree of freedom of the knuckle shape can be improved.
That is, in the case of the first example of the present embodiment, the floating caliper 10 constituting the floating disc brake mechanism is not supported by a dedicated support, but constitutes an opposed piston type disc brake mechanism. By supporting the opposed piston type caliper 9, the opposed piston type disc brake mechanism and the floating type disc brake mechanism are integrated to constitute one disc brake device 8. Moreover, in the case of the first example of the present embodiment, the floating caliper 10 is disposed in the circumferential portion between the connecting portion 16a and the cover portion 17, so that the floating caliper 10 is opposed piston type. The caliper 9 is supported in a state of being superimposed (mounted) in the radial direction.

For this reason, as in the case of the conventional structure shown in FIG. 32, for example, a structure in which two dedicated devices for the service brake and the parking brake are separated in the circumferential direction, or a structure that is simply continuous in the circumferential direction. In comparison, the overall size of the apparatus can be reduced (especially for the structure continuous in the circumferential direction, the overall length in the circumferential direction can be shortened). Further, since the support of the floating type disc brake can be omitted and the number of pistons can be reduced, the weight and cost of the apparatus can be reduced. Specifically, for example, in the structure shown in FIG. 32, when the opposed piston type disc brake device 2 is provided with four pistons and the floating type disc brake device 3 is provided with one piston, According to the structure of the first example of the present embodiment, two pistons (and peripheral members such as piston seals) can be omitted while maintaining the braking performance of the service brake and the parking brake. Further, according to the structure of the first example of the present embodiment, the mounting portion necessary for the knuckle 4 is only one for supporting and fixing the opposed piston type caliper 9, and thus the degree of freedom regarding the shape of the knuckle 4 is sufficient. Can be improved. Furthermore, since the pair of

pads

11a and 11b are used in common by the opposed piston type disc brake mechanism and the floating type disc brake mechanism, the number of pads is reduced (compared to the structure of FIG. This also makes it possible to reduce weight and cost.

In addition, since the braking force by the service brake is obtained by operating both the opposed piston type disc brake mechanism and the floating type disc brake mechanism, the braking force of the service brake can be obtained only by the floating type disc brake device. In comparison, it is possible to improve the rise (response) of the braking force. In addition, compared with a structure in which the braking force of the service brake can be obtained only by the opposed piston type disc brake device, the braking force and the size of the device (full length in the circumferential direction) remain substantially the same, and one piston (and piston) It is possible to omit peripheral members such as seals.

Further, in the case of the first example of the present embodiment, the aluminum system arranged on the inlet side rather than the first inner piston 12b (first outer piston 12a) made of aluminum alloy arranged on the outlet side. The diameter of the second piston 13 made of an alloy or iron-based alloy is reduced. This is advantageous in reducing the weight. Further, since the surface pressure can be easily made uniform, it is possible to effectively prevent so-called uneven wear in which the wear amount on the entry side of each of the

pads

11a and 11b is larger than the wear amount on the delivery side.

[Second Example of Embodiment]
A second example of the embodiment of the present invention will be described with reference to FIGS. The feature of the second example of the present embodiment is the support structure of the floating caliper 10a with respect to the opposed piston caliper 9a constituting the disc brake device 8a. Since other configurations and operational effects are basically the same as in the case of the first example of the above-described embodiment, redundant description will be omitted or simplified. Hereinafter, a second embodiment of the present embodiment will be described. The description will focus on the features of the example.

In the case of the second example of the present embodiment, a pair of

guide pins

38a, 38b is provided in a state of being bridged in the axial direction between the outer body portion 14a and the inner body portion 15a constituting the opposed piston type caliper 9a. Is supported. For this reason, in the case of the second example of the present embodiment, the outer body portion 14a and the inner body portion 15a have a radially outer end portion closer to one circumferential end than the connecting portion 16a on one circumferential side. In the state of projecting to the other side in the circumferential direction, the turn-in

side support portions

39a and 39b are formed, and at the radially outer end portion of the outer middle portion 14a and the inner body portion 15a in the circumferential direction from the cover portion 17 Also, each of the extending

side support portions

40a and 40b is formed in a state of projecting to one side in the circumferential direction. And both the axial direction both ends of the guide pin 38a of the circumferential direction one side of the said guide pins 38a and 38b are couple | bonded and fixed with respect to the said both entrance

side support parts

39a and 39b, and the circumferential direction other side. Both end portions in the axial direction of the guide pin 38b are coupled and fixed to the both outlet

side support portions

40a and 40b.

Also,

arm portions

41a and 41b projecting in the circumferential direction are provided at both ends in the circumferential direction of the bridge portion 31a constituting the floating caliper 10a. And the axial direction intermediate part of each said

guide pin

38a, 38b becomes a sliding part inside the guide hole formed in the state which penetrates the front-end | tip part of each of these

arm parts

41a, 41b to an axial direction. It is inserted loosely to allow displacement.

Further, the portion between the both-entry-

side support portions

39a, 39b and the tip of the arm portion 41a in the guide pin 38a, and the both-out-

side support portions

40a, 40b and the arm in the guide pin 38a. The periphery of each portion between the tip portion of the portion 41b is covered with a dustproof boot made of a material having excellent heat resistance (not shown).

In the case of the second example of the present embodiment, as described above, the floating caliper 10a is disposed between the outer body portion 14a and the inner body portion 15a of the guide pins 38a and 38b. Axial displacement is supported. Further, in the case of the second example of the present embodiment, a larger heat radiating window portion 42a is formed in the circumferential central portion of the bridge portion 31a than in the case of the first example of the embodiment.

In the case of the second example of the present embodiment having the above-described configuration, the number of members that protrude from the inner side of the disc brake device 8a is less than that in the case of the first example of the above embodiment. it can. For this reason, compared with the structure of the 1st example of the said embodiment, it becomes advantageous when aiming at the shortening of the dimension regarding an axial direction. Further, since the large window portion 42a is formed in the bridge portion 31a, heat from the rotor 1 can be efficiently released to the outside in the radial direction, and it is advantageous in reducing the weight.
About another structure and an effect, it is the same as that of the case of the 1st example of the said embodiment.

[Third example of embodiment]
A third example of the embodiment of the present invention will be described with reference to FIGS. A feature of the third example of the present embodiment is that two opposed

first cylinders

43a, 43b, 44a, 44b (turn-in side first outer cylinders) are opposed to the opposed piston type caliper 9b constituting the disc brake device 8b. 43a, a first inlet inner cylinder 43b, a first outlet cylinder 44a, and a first outlet inner cylinder 44b) are provided, and the floating caliper 10b (floating type disc brake mechanism) is arranged accordingly. At the point where the position has changed. Since other configurations and operational effects are basically the same as in the case of the first example of the above-described embodiment, redundant description will be omitted or simplified, and the third embodiment will be described below. The description will focus on the features of the example.

In the case of the third example of the present embodiment, the turn-in side first outer cylinder 43a and the rotation are provided on the inner side of one end portion in the circumferential direction of the outer body part 14b and the inner body part 15b constituting the opposed piston type caliper 9b. A state in which the entry-side first inner cylinder 43b is formed so as to face each other, and the delivery-side first outer cylinder 44a and the delivery-side first inner cylinder 44b face each other inside the other end portion in the circumferential direction. It is formed with. In other words, the turn-in side first outer cylinder 43a and the turn-out side first outer cylinder 44a are formed in the outer body part 14b so as to be separated from each other in the circumferential direction, and the inner body part. In 15b, the turn-in side first inner cylinder 43b and the turn-out side first inner cylinder 44b are formed in a state of being separated in the circumferential direction. Then, in each of the turn-in side first outer cylinder 43a, the turn-in side first inner cylinder 43b, the turn-out side first outer cylinder 44a, and the turn-out side first inner cylinder 44b, a turn-in side first outer piston is provided. 45a, the turn-in side first inner piston 45b, the turn-out side first outer piston 46a, and the turn-out side first inner piston 46b are fitted in an oil-tight manner and capable of displacement in the axial direction.

Further, in the case of the third example of the present embodiment, the facing piston type caliper 9b is not provided with the cover portion 17 which the structures of the first example and the second example of the embodiment had. . For this reason, an opening 18a that is long in the circumferential direction is formed between the coupling portion 16a on one circumferential side and the coupling portion 16b on the other circumferential side. In addition, a storage groove 23a that is recessed in the axial direction is formed over the entire width in the radial direction in the circumferential intermediate portion (the portion that is aligned with the opening 18a in the circumferential direction) on the inner side surface of the outer body portion 14b. On the other hand, the radially inner end of the inner body portion 15b in the middle in the circumferential direction avoids the turn-in side first inner cylinder 43b and the turn-out side first inner cylinder 44b. A relief recess 24a that is recessed in the direction is formed.

The floating caliper 10b is arranged at the center position in the circumferential direction between the pair of connecting

portions

16a and 16b (opening 18a) constituting the opposed piston caliper 9b having the above-described configuration. The opposed piston caliper 9b is supported so as to be capable of displacement in the axial direction. For this reason, in the case of the third example of the present embodiment, the outer side end portions of a pair of guide pins (reverse pins) 48a and 48b are fixed to the inner body portion 15b near both ends in the circumferential direction with screws. Has been. A pair of arms formed on the inner side end of the floating caliper 10b, with the middle part of the part protruding from the inner body part 15b of the guide pins 48a and 48b closer to the inner side as a sliding part. The guide holes formed at the respective tip portions of 47a and 47b are loosely inserted so as to allow displacement in the axial direction. Further, the periphery of both guide pins 48a and 48b is covered with

dustproof boots

49a and 49b made of an elastic material, respectively.

As described above, the floating caliper 10b is provided at the outer side end of the floating caliper 10b in a state where the floating caliper 10b is supported so as to be capable of displacement in the axial direction with respect to the opposed piston caliper 9b. The claw portion 29a is disposed inside the housing concave groove 23a and at a portion in the circumferential direction between the turn-in side first outer piston 45a and the turn-out side first outer piston 46a. For this reason, in the case of the third example of the present embodiment, as shown in FIG. 31, on the both sides in the circumferential direction of the claw portion 29a, the turn-in side first outer piston 45a and the turn-out side

second Notches

50 and 50 are formed so as not to contact the outer piston 46a. Similarly, the radially inner half of the cylinder portion 30a provided at the inner side end of the floating caliper 10b is disposed inside the escape recess 24a. Accordingly, when the floating caliper 10b is supported with respect to the opposed piston caliper 9b, when the portion arranged on the inner side is viewed from the rotor 1 side, as shown in FIG. The second piston 13 fitted in the second cylinder 32 of the floating caliper 10b is disposed in the circumferential direction between the first inner piston 45b and the delivery-side first inner piston 46b. On the other hand, when the portion arranged on the outer side is viewed from the rotor 1 side, as shown in FIG. 31, the circumferential direction between the first inlet-side piston 45a and the first outer-piston 46a on the outlet side as shown in FIG. The claw portion 29a is disposed in the intermediate portion in a state where both ends in the circumferential direction are radially overlapped with the turn-in side and turn-out side first

outer pistons

45a, 46a.

In the case of the disc brake device 8b of the third example of the present embodiment having the above-described configuration, when operating the service brake, the outer and inner turn-in side

first cylinders

43a and 43b and the outer and inner Pressure oil is fed into the delivery-side

first cylinders

44a and 44b and the second cylinder 32, respectively. Accordingly, the

pads

11a and 11b are pressed against both side surfaces of the rotor 1 by the outer and inner return side

first pistons

45a and 45b and the outer and inner return side

first pistons

46a and 46b. At the same time (substantially simultaneously), the second piston 13 is displaced in a direction approaching the rotor 1. As a result, the inner pad 11b is pressed against the inner side surface of the rotor 1, and as a reaction of the pressing, the floating caliper 10b is displaced toward the inner side with respect to the opposed piston caliper 9b, and the claw portion 29a Thus, the outer pad 11 a is pressed against the outer side surface of the rotor 1. As a result, the rotor 1 is strongly pressed from both sides in the axial direction to perform braking.

On the other hand, when the parking brake is operated, the second piston 13 is moved in the second cylinder 32 by using the electric pressing device 36 as in the case of the first example of the embodiment. Mechanically displaced in the axial direction. As a result, the inner pad 11b is pressed against the inner side surface of the rotor 1, and the outer pad 11a is pressed against the outer side surface of the rotor 1 by the claw portion 29a. As a result, like the service brake described above, the rotor 1 is sandwiched from both sides by the outer pad 11a and the inner pad 11b, and braking is performed.

In the case of the disc brake device 8b of the third example of the present embodiment having the above-described configuration, the pair of pads 11a, the counter piston disc brake mechanism constituted by the counter piston caliper 9b is used. The portions near both ends in the circumferential direction of 11b can be pressed simultaneously. When the service brake is activated, the opposed piston type disc brake mechanism is configured before the second piston 13 and the claw portion 29a constituting the floating disc brake mechanism press the pair of

pads

11a and 11b. Since each of the

first pistons

45a, 45b, 46a, 46b starts to press the pair of

pads

11a, 11b, it is advantageous to smoothly displace the pair of

pads

11a, 11b in the axial direction. Become. For example, when the structure shown in FIG. 32 is such that the opposed piston type disc brake device 2 is provided with six pistons and the floating type disc brake device 3 is provided with one piston, this embodiment is implemented. According to the structure of the third example of this form, two pistons (and peripheral members such as piston seals) can be omitted while maintaining the braking performance of the service brake and the parking brake.
About another structure and an effect, it is the same as that of the case of the 1st example of the said embodiment.

Here, the features of the above-described embodiments of the disc brake device according to the present invention will be summarized and listed below.
[1] An outer body part (14) and an inner body part (15) provided with a rotor (1) rotating together with a wheel, and these outer body parts at a radially outward position from the outer peripheral edge of the rotor (1). (14) and a pair of connecting portions (16a, 16b) that connect both ends in the circumferential direction of the inner body portion (15), and the outer body portion (14) portion and the inner body portion (15) are opposed to each other. And a pair of first cylinders (a first outer cylinder 19a, a first inner cylinder 19b) and a counter-piston caliper fixed to a knuckle (4) in a state of straddling the rotor (1). (9) and
A pair of pads (an outer pad 11a and an inner pad 11b) supported so as to be capable of displacement in the axial direction with respect to the opposed piston type caliper (9) in a state of being disposed on both sides of the rotor (1);
A claw portion (29) provided on the outer side, and one second cylinder (32) provided on the inner side and opening toward the inner side surface of the claw portion (29) The counter piston caliper (9) is disposed between the pair of connecting portions (16a, 16b) and straddles the pair of pads (outer pad 11a, inner pad 11b) from the outside in the radial direction. A floating caliper (10) supported so as to be axially displaceable,
Each of the first cylinders fitted in the first cylinders (the first outer cylinder 19a and the first inner cylinder 19b) and the second cylinder (32) in a liquid-tight manner and capable of displacement in the axial direction. The same number of first pistons (first outer piston 12a, first inner piston 12b) and one second piston (13) as the cylinders (first outer cylinder 19a, first inner cylinder 19b),
The braking force by the service brake is obtained by feeding the pressure oil into the first cylinders (first outer cylinder 19a, first inner cylinder 19b) and the second cylinder (32), respectively. The pair of pads (outer pad 11a, inner pad 11b) are pressed against both side surfaces of the rotor (1) by the first outer piston 12a and the first inner piston 12b), and the second piston (13) and the claw The pair of pads (outer pad 11a, inner pad 11b) are pressed against both side surfaces of the rotor (1) with the inner side surface of the portion (29),
The braking force by the parking brake is such that the pair of pads (outer pad 11a, inner pad 11b) are applied to both side surfaces of the rotor (1) between the second piston (13) and the inner side surface of the claw portion (29). It is generated only by being pressed,
Disc brake device (8).
[2] An electric pressing device (36) for displacing the second piston (13) in the axial direction in the second cylinder (32) using an electric motor as a drive source is provided, and the parking brake The disc brake device (8) described in [1] above, wherein the braking force generated by is generated using the electric pressing device (36).
[3] The disc brake device according to [2], wherein the electric pressing device (36) is supported by an inner side portion (an inner side surface of the cylinder portion 30) of the floating caliper (10). ).
[4] The second cylinder (32) is more in the circumferential direction than at least one of the first cylinders (first outer cylinder 19a and first inner cylinder 19b) provided in the inner body portion (15). The disc brake device (8) according to any one of the above [1] to [3], which is disposed on the turn-in side of the rotor (1).
[5] The disc brake device (8) according to any one of claims 1 to 4, wherein one set of each of the first cylinders (the first outer cylinder 19a and the first inner cylinder 19b) is provided. .
[6] A pair of guide pins (34a, 34a) supported by the floating caliper (10) in a state of being circumferentially separated from the inner body part (15) constituting the opposed piston caliper (9). 34b) is supported so as to be displaceable in the axial direction with respect to the opposed piston type caliper (9) by using the portions protruding to the inner side from the inner body portion (15) in 34b). The disc brake device (8) according to any one of the above.
[7] The floating caliper (10a) is axially bridged between the outer body part (14a) and the inner body part (15a) constituting the opposed piston caliper (9a), and A pair of guide pins (38a, 38b) supported in a circumferentially separated state is supported between the outer body portion (14a) and the inner body portion (15a) so as to be capable of displacement in the axial direction. The disc brake device (8a) according to any one of claims 1 to 5.

The disc brake device of the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
This application is based on a Japanese patent application filed on December 26, 2013 (Japanese Patent Application No. 2013-269038), the contents of which are incorporated herein by reference.

In each example of the above-described embodiment, the description has been made only about the structure in which the braking force by the parking brake is obtained by using the electric pressing device, but the present invention is not limited to such a structure. That is, if the braking force by the parking brake can be generated by the floating type disc brake mechanism, a driving structure by a parking lever, such as the structure disclosed in Japanese Patent Application Laid-Open No. 2007-177995, may be employed. it can. That is, it is possible to employ a structure in which the second piston is pressed toward the rotor by sequentially driving the cam mechanism and the adjusting mechanism (feed screw mechanism) disposed in the cylinder portion by the parking lever.

DESCRIPTION OF SYMBOLS 1 Rotor 2 Opposite piston type disc brake device 3 Floating type disc brake device 4 Knuckle 5

Caliper

6a, 6b Mounting part 7

Support

8, 8a, 8b

Disc brake device

9, 9a, 9b Opposite

piston type caliper

10, 10a, 10b Floating type Caliper 11a Outer pad (pad)
11b Inner pad (pad)
12a First outer piston (first piston)
12b First inner piston (first piston)
13

Second piston

14, 14a, 14b

Outer body part

15, 15a, 15b

Inner body part

16a, 16b Connecting part 17

Covering part

18, 18a Opening part 19a First outer cylinder (first cylinder)
19b First inner cylinder (first cylinder)
20a,

20b Inlet

21a,

21b Guide wall

22a,

22b Guide groove

23,

23a Storage groove

24,

24a Escape recess

25a, 25b Mounting seat 26 Lining 27

Back plate

28a,

28b Ear

29,

29a Claw

30,

30a Cylinder part

31, 31a Bridge part 32

Second cylinder

33a,

33b Arm part

34a,

34b Guide pin

35a, 35b Dust-proof boot 36 Electric pressing device 37

Casing

38a,

38b Guide pin

39a, 39b Entry

side support part

40a, 40b Delivery

side support part

41a,

41b Arm part

42, 42a Window part 43a Delivery side first outer cylinder 43b Delivery side first inner cylinder 44a Delivery side first outer cylinder 44b Delivery side first inner cylinder 45a Delivery time Side first outer piston 45b Napisuton 46a times out side first outer piston 46b run-out side first

inner piston

47a, 47b the

arm portion

48a,

48b guide pins

49a, 49b dustproof boot 50 cutout 51 bolt head

Claims

A pair of outer body portions and inner body portions that are provided across a rotor that rotates together with the wheels, and the circumferential ends of the outer body portions and the inner body portions at positions radially outward from the outer peripheral edge of the rotor. A counter-piston caliper that is fixed to the knuckle in a state of straddling the rotor, the connecting portion, and the outer body portion and the inner body portion having one or more first cylinders provided to face each other.
A pair of pads supported so as to be capable of displacement in the axial direction with respect to the opposed piston caliper in a state of being disposed on both sides of the rotor;
A claw portion provided on the outer side, and a second cylinder provided on the inner side and opening toward the inner side surface of the claw portion, and a portion between the pair of connecting portions in the circumferential direction A floating type caliper supported in such a manner as to be axially displaceable with respect to the opposed piston type caliper in a state straddling the pair of pads from the outside in the radial direction;
In each of the first cylinder and the second cylinder, the same number of first pistons and one second piston as the first cylinders are fitted so as to be liquid-tight and capable of displacement in the axial direction. Prepared,
The braking force by the service brake is that the pair of pads are pressed against both side surfaces of the rotor by the first pistons by the pressure oil being fed into the first cylinder and the second cylinder, respectively. Occurs when the pair of pads are pressed against both side surfaces of the rotor by the second piston and the inner side surface of the claw portion,
The braking force generated by the parking brake is generated only by the pair of pads being pressed against both side surfaces of the rotor at the second piston and the inner side surface of the claw portion.
Disc brake device.
An electric pressing device for displacing the second piston in the second cylinder in the axial direction is provided using an electric motor as a driving source, and the braking force by the parking brake uses the electric pressing device. The disc brake device according to claim 1, wherein the disc brake device is generated.
The disc brake device according to claim 2, wherein the electric pressing device is supported by an inner side portion of the floating caliper.
The first cylinder according to any one of claims 1 to 3, wherein the second cylinder is disposed closer to the rotor on the circumferential side than at least one of the first cylinders provided in the inner body portion. Disc brake device described in the section.
The disc brake device according to any one of claims 1 to 4, wherein one set of each of the first cylinders is provided.
The floating caliper is a portion projecting toward the inner side from the inner body part of the pair of guide pins supported in a state of being circumferentially separated from the inner body part constituting the opposed piston type caliper. The disc brake device according to any one of claims 1 to 5, wherein the disc brake device is supported so as to be axially displaceable with respect to the opposed piston caliper.
A pair of guide pins supported in a state where the floating caliper is axially bridged between the outer body portion and the inner body portion constituting the opposed piston caliper and separated in the circumferential direction 6. The disc brake device according to claim 1, wherein a portion between the outer body portion and the inner body portion is supported so as to be capable of displacement in the axial direction.