JP2005042739A - Disc brake with parking mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize structure in which stable large braking force can be provided even when a parking lever 20b is not especially long, and in which the stroke of a parking cable can be shorter. <P>SOLUTION: Between a gap adjusting mechanism 10a attached to a piston 6b and an anchor member 27 fixed to a caliper 4b, a toggle mechanism 22 is provided. The toggle mechanism 22a is provided with a proximal oscillation shaft pin 37, a proximal link arm 38, a distal oscillation shaft pin 39, and a distal link arm 40, and it is extended/contracted by oscillation of the parking lever 20b. Motion of the piston 6b is set to be faster in an initial stage of actuation of the parking mechanism, so that the stroke of the piston is larger. In a terminal stage of actuation, it is set slower, while piston pressure is set larger, thereby large braking force is secured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The disc brake with a parking mechanism according to the present invention is used for braking a vehicle (automobile). In particular, the present invention realizes a compact and stable structure capable of generating a large braking force by devising a structure of a disc brake having a parking brake mechanism for keeping a vehicle in a stopped state. Note that the braking force in this specification refers to a force that is generated when the parking brake mechanism is operated during parking, so as to maintain the vehicle in a stopped state.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, disc brakes having various structures are known as brakes for braking a vehicle. In addition, as described in Patent Documents 1 and 2, for example, various types of disk brakes with a parking mechanism have been proposed and are actually used. 11-13 has shown the disc brake with a parking mechanism described in patent document 1 among these. A pair of pads 2 a and 2 b are arranged on both sides of the rotor 1 that rotates together with the wheels while being supported by the support 3. A caliper 4 is supported on the support 3 so as to be displaceable in the axial direction of the rotor 1. Then, the piston 6 fitted in the cylinder 5 provided inside the inner side of the caliper 4 (the center side in the width direction when assembled to the vehicle, the right side in FIG. 12), and the outer side of the caliper 4 (the vehicle The two pads 2a and 2b are clamped from both sides in the axial direction of the rotor 1 by a claw portion 7 provided on the outer side in the width direction in the assembled state at the left side in FIG.
[0003]
Further, a rod 8 for constituting a parking mechanism is provided in a state in which the caliper 4 penetrates the cylinder bottom portion 9 partitioning the back end of the cylinder 5 in a liquid-tight manner and protrudes out of the cylinder 5. The rod 8 presses the inner pad 2 a against the inner side surface of the rotor 1 through the piston 6 in accordance with the axial movement in the direction approaching the rotor 1. In the illustrated example, this piston 6 and the rotor 1 side portion of the rod 8 are coupled via a gap adjusting mechanism 10 composed of a combination of a plurality of components, whereby the linings 11 and 11 of both the pads 2a and 2b are combined. The gap between the linings 11 and 11 and the side surface of the rotor 1 is kept constant when the parking mechanism is not operated, regardless of the wear of the parking mechanism.
[0004]
Further, a cam mechanism 13 for pressing the rod 8 against the piston 6 is provided between the anchor member 12 fixed to the outside of the cylinder bottom 9 of the caliper 4 (right side in FIG. 12) and the rod 8. . In order to constitute the cam mechanism 13, a rotary shaft portion 16 provided in the cam member 15 is rotatably inserted into a circular hole 14 provided concentrically with the rod 8 in the anchor member 12. A plurality of balls 18 are sandwiched between the cam plate portion 17 provided at the rotor side end of the cam member 15 and the anchor member 12. Cam grooves 19a and 19b in which the depth in the axial direction gradually changes in the circumferential direction are formed in the portion where the balls 18 and 18 are sandwiched between the surfaces of the cam plate portion 17 and the anchor member 12 facing each other. is doing. Further, a base end portion of the parking lever 20 is coupled and fixed to a portion of the rotating shaft portion 16 that protrudes from the anchor member 12 toward the opposite rotor side.
[0005]
In the case of a disc brake with a parking mechanism configured as described above, when a service brake (a brake for decelerating or stopping a traveling vehicle) is used, this cylinder 5 is fed by feeding pressure oil into the cylinder 5. The piston 6 is protruded from. As a result, the caliper 4 is displaced toward the inner side of the support 3 at the same time as the piston 6 presses the inner pad 2 a against the inner side surface of the rotor 1. The claw portion 7 of the caliper 4 presses the outer side pad 2 b against the outer side surface of the rotor 1. As a result, the rotor 1 is strongly clamped from both sides by the pair of pads 2a and 2b, and braking is performed.
[0006]
On the other hand, during the parking brake, the cam member 15 is rotated via the parking lever 20 by pulling the parking cable 21. As a result, the balls 18 and 18 move to the shallow portions of the cam grooves 19a and 19b while rolling, and the cam plate portion 17 and the anchor member 12 formed with the cam grooves 19a and 19b. Increase the distance between the surfaces facing each other. The cam plate portion 17 is displaced toward the rotor side, and the cam plate portion 17 pushes the piston 6 toward the rotor side via the rod 8. As a result, as in the case where pressure oil is fed into the cylinder 5, the rotor 1 is strongly held from both sides by the pair of pads 2a and 2b, and braking is performed.
[0007]
FIG. 14 shows a disc brake with a parking mechanism described in Patent Document 2. In the second example of this conventional structure, the gap adjusting mechanism 10a and the toggle mechanism 22 are arranged in series between the anchor member 12a coupled to the caliper 4a and the piston 6a. The toggle mechanism 22 presses the piston 6a toward the rotor 1 through the gap adjusting mechanism 10a as it extends, thereby causing braking. Such a toggle mechanism 22 has a base end portion of the parking lever 20a coupled to one link arm 23a (left side in FIG. 14) of the pair of link arms 23a and 23b that are brought into contact with each other. The distance between the opposite ends of the pair of links 23a and 23b is enlarged or reduced. The coupling shaft that couples the base end portion of the parking lever 20a to the link arm 23a can swing and be displaced in the vertical direction in FIG.
[0008]
Further, Non-Patent Document 1 describes the structures of various toggle mechanisms used as a force-increasing mechanism. However, the description of Non-Patent Document 1 mainly uses the toggle mechanism for a simple press device.
[0009]
[Patent Document 1]
JP 2001-12518 A
[Patent Document 2]
JP 2001-20983 A
[Non-Patent Document 1]
Seisaburo Nara, “Machine Movement Mechanism”, Gihodo Publishing Co., Ltd., October 15, 1957, p. 133-139
[0010]
[Problems to be solved by the invention]
Among the disc brakes with a parking mechanism as described above, in the case of the structure described in Patent Document 1, in order to ensure a sufficient braking force, the cam grooves 19a and 19b are inclined gently, It is necessary to increase the length of the lever 20. However, if the former structure is adopted, the required rotation angle of the parking lever 20 is increased. On the contrary, when the latter structure is adopted, the displacement length of the tip of the parking lever 20 becomes long. For this reason, there is a problem that the stroke of the parking cable becomes long regardless of which structure is employed. In order to improve this point, the inclination of each cam groove 19a, 19b is set so that the angle of the portion where each ball 18, 18 abuts in the initial stage of operation of the parking mechanism while filling the gap between the pad and the rotor is as follows. There is a case where the inclination angle is changed in two steps in the circumferential direction so that the angle of the portion where the balls come into contact with each other when the pad strongly holds the rotor in the final stage of operation becomes gentle. However, with respect to the cam grooves 19a and 19b, since a plurality of balls 18 and 18 must roll at the same time, high precision machining is required. Moreover, if the gap between the pad and the rotor becomes smaller than the set value, it is necessary to strongly hold the balls 18 and 18 in a state where the cam grooves 19a and 19b are still steeply inclined. As a result, it becomes difficult to obtain a sufficient braking force.
[0011]
On the other hand, in the case of the structure in which the piston 6a is pressed by the toggle mechanism 22 as described in Patent Document 2, the toggle mechanism 22 can prevent the parking lever 20a from swinging if the use angle is appropriately regulated. The movement amount of the piston can be made substantially constant, and the length of the parking lever 20a can be easily reduced while ensuring the braking force. However, in the case of the structure described in Patent Document 2, the contact point between the parking lever 20a and the link arm 23a is not stable in the floating state, and the displacement of the parking lever 20a due to the twisting force from the parking cable is also small. Because it occurs, it is difficult to obtain a stable braking force.
[0012]
Non-Patent Document 1 describes various toggle mechanisms, and it is intended to obtain a practical disc brake with a parking mechanism by improving an appropriate toggle mechanism and appropriately combining it with other components. Is not suggested.
The disc brake with a parking mechanism of the present invention has been invented to realize a structure that is small and can stably generate a large braking force.
[0013]
[Means for solving the problems]
The disc brake with a parking mechanism of the present invention includes a pair of pads, a caliper, a toggle mechanism, and a parking lever, as in the conventional disc brake with a parking mechanism described in Patent Document 2 described above. Prepare.
The pair of pads is disposed on both sides of the rotor that rotates with the wheels.
Further, the caliper presses both the pads against both axial sides of the rotor as the piston fitted in a cylinder provided therein is pushed out.
The toggle mechanism is provided at a portion protruding from the cylinder bottom of the caliper, and presses the piston toward the rotor as it extends.
The parking lever expands and contracts the toggle mechanism as it swings.
[0014]
In particular, in the disc brake with a parking mechanism of the present invention, the toggle mechanism includes a proximal-side swing shaft pin, a proximal-side link arm, a distal-end swing shaft pin, and a distal-side link arm.
Of these, the proximal-side swing shaft pin is a part of the caliper or a member fixed to the caliper, and is provided at the portion facing the bottom of the piston as the swing center of the parking lever.
The base end side link arm is coupled to the base end side swing shaft pin together with the base end portion of the parking lever so as to be swingable and displaceable.
The distal-side oscillating shaft pin is provided at the distal end of the proximal-side link arm.
Further, the distal end side link arm is slidably coupled with the proximal end side link arm to the distal end side pivot shaft pin, and the distal end portion is abutted against a portion moving in the axial direction together with the piston. Yes.
The base end portion of the parking lever is integrated with the base end side link arm.
[0015]
[Action]
In the case of the disc brake with a parking mechanism of the present invention configured as described above, when the braking force is generated along with parking, the base link arm is set by the operation of the parking lever, and the base swing shaft pin is set. Swing to the center. Then, the arrangement state of the base end side link arm and the front end side link arm is made closer to a straight line than the parking mechanism inoperative state. As a result, the distance between the distal end of the distal end side link arm and the proximal end side oscillating shaft pin increases, and the distal end of the distal end side link arm presses the piston toward the side surface of the rotor. The pair of pads pressed by the piston and caliper strongly hold the rotor from both sides, and the braking force is generated. A toggle mechanism composed of a proximal-side rocking shaft pin, a distal-side rocking shaft pin, a proximal-side link arm, and a distal-side link arm is an initial operation for pressing each pad based on the rocking of the parking lever. Has a large stroke (small lever ratio), and can effectively reduce the gap between each pad and the rotor. As the operation proceeds, the lever ratio increases, and the force for pressing the rotor by the pads increases. Further, the toggle mechanism does not generate a twisting force, and has few portions that rub and is efficient. Furthermore, based on the two-stage structure of the parking lever and the link, the lever ratio can be set high, and a large braking force can be stably generated without using a particularly long parking lever. It has the feature that the stroke can be shortened.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
1 to 6 show a first example of an embodiment of the present invention. A pair of pads 2a and 2b are arranged on both sides of the rotor 1 rotating together with the wheels while being supported by the support 3a. Further, the caliper 4b is displaced in the axial direction of the rotor 1 by slidably inserting a pair of guide pins 24, 24 fixed to the caliper 4b into a pair of guide portions 25, 25 provided on the support 3a. Supports freely. A piston 6b fitted in a cylinder 5a provided on the inner side (right side in FIGS. 1 and 2) of the caliper 4b, and a claw provided on the outer side (left side in FIGS. 1 and 2) of the caliper 4b. The pads 7a and 2b are sandwiched from both sides in the axial direction of the rotor 1 by the portion 7a.
[0017]
When the service brake is used, the piston 6b is protruded from the cylinder 5a by feeding pressure oil into the cylinder 5a. As a result, the piston 6b presses the inner pad 2a against the inner side surface of the rotor 1, and at the same time, the caliper 4b is moved based on the sliding between the guide pins 24, 24 and the guide portions 25, 25. The support 3a is displaced toward the inner side. The claw portion 7 a of the caliper 4 b presses the outer pad 2 b against the outer side surface of the rotor 1. As a result, the rotor 1 is strongly clamped from both sides by the pair of pads 2a and 2b, and braking is performed.
[0018]
In order to provide the parking brake mechanism in the disc brake as described above, in this example, the anchor member 27 is attached to the cylinder side wall end portion (the right end portion in FIGS. 1 and 2) of the caliper 4b, and the pair of bolts 31, 31 is used. It is fixed by binding. The anchor member 27 is integrally formed by punching and forming a metal plate having sufficient strength and rigidity, such as a steel plate, and a U-shaped or U-shaped flat plate-shaped substrate portion 28 and the substrate portion 28. It comprises a bent portion 29 bent from the outer peripheral edge. The bent portion 29 has a role of locking one end portion of a return spring 30 to be described later and a role of a guide portion for guiding a parking cable which will be described later.
[0019]
In the case of this example, a toggle mechanism 22a and a gap adjusting mechanism 10a are arranged in order from the side of the substrate portion 28 between the inner end of the inner periphery of the substrate portion 28 of the anchor member 27 and the inside of the piston 6b. They are arranged in series with each other. Among these, the gap adjusting mechanism 10a is composed of an adjusting screw 32, an adjusting nut 33, a compression coil spring 34, a thrust ball bearing 35, a plug 36, and the like. As the lining of the pads 2a and 2b is worn, Elongate. The gap between the lining of each of the pads 2a and 2b and the side surface of the rotor 1 when the parking mechanism is not operated is prevented. The configuration and operation of such a gap adjusting mechanism 10a are described in the above-mentioned Patent Document 2 and the like and are conventionally known, and are not related to the gist of the present invention.
[0020]
On the other hand, the toggle mechanism 22a includes a proximal-side swing shaft pin 37, a proximal-side link arm 38, a distal-side swing shaft pin 39, and a distal-side link arm 40. 6b is pressed toward the inner side surface of the rotor 1 through the gap adjusting mechanism 10a. Such expansion and contraction of the toggle mechanism 22a is performed based on the swing of the parking lever 20b. In the case of this example, the base end portion of the parking lever 20b is formed in a U shape so as to sandwich the substrate portion 28 of the anchor member 27, thereby forming a pair of support plate portions 41, 41 parallel to each other. Yes. In the case of this example, these support plate portions 41 and 41 are characterized in that they function as an integral structure with the base end side link arm 38. For this reason, the base end side support holes 42 and 42 and the front end side support holes 43 and 43 are formed in the portions where the base end side portion and the front end portion are aligned with each other with respect to the intermediate portion between the support plate portions 41 and 41, respectively. And form.
[0021]
Of the support holes 42 and 43, the base end side support holes 42 and 42 support and fix both ends of the base end side swing shaft pin 37. In this state, the base-side oscillating shaft pin 37 is a part of the anchor member 27 fixed to the caliper 4b on the extension line of the central axis of the piston 6b, and a portion facing the bottom of the piston 6b. Is provided. The support plate portions 41 and 41 (base end side link arms 38) are coupled and supported to the anchor member 27 so as to be swingable and displaceable by the base end side swing shaft pin 37. For this reason, in the case of the present example, the base-side swing shaft pin 37 is provided with a flange 44 at one end (upper end in FIGS. 2 to 4) and a locking groove 45 on the outer peripheral surface of the tip. The formed one is used. Such a base end side swing shaft pin 37 is inserted into the base end side support holes 42, 42 and the anchor hole 46 formed in the anchor member 27, and supports one side (below in FIGS. 2 to 4). The tip portion is projected from the plate portion 41. In this state, the retaining ring 47 is locked in the locking groove 45 to prevent the proximal-side swing shaft pin 37 from coming out of the support holes 42 and 46.
[0022]
In the illustrated example, seal rings 48 and 48 as seal members are sandwiched between both surfaces of the anchor member 27 and the support plate portions 41 and 41, respectively. Each of the seal rings 48 and 48 includes a cover 49 made of a metal plate and a seal 50 made of an elastic material such as rubber. By providing such seal rings 48, 48 at a position sandwiching the anchor member 27, the outer peripheral surface of the intermediate portion of the base-side oscillating shaft pin 37 that is a rotational displacement contact portion and the inner periphery of the anchor hole 46 are provided. Prevents foreign matter such as water and dust from entering between the surfaces. Then, the two peripheral surfaces are prevented from being rusted or worn, and the swing displacement of the both support plate portions 41, 41 (base end side link arm 38) is smooth and rattling. It is made to be done without.
[0023]
Further, in order to swing and displace both the support plate portions 41 and 41 (base end side link arm 38) around the base end side swing shaft pin 37, one support plate (upper in FIGS. 2 to 4). The parking lever 20b extends from the side edge of the portion 41. That is, the support plate portions 41 and 41 and the parking lever 20b are integrally formed of the same metal plate, and the side edge of the one support plate portion 41 and the base end portion of the parking lever 20b are made continuous. . At the tip of the parking lever 20b, the metal plate is folded in a U shape to form a pair of locking plate portions 51a and 51b parallel to each other, and the portions of the locking plate portions 51a and 51b are aligned with each other In addition, U-shaped notches 52 and 52 are formed. In an assembled state to the vehicle, a locking piece fixed to an end portion of a parking cable (not shown) that is inserted through the guide hole 53 of the bent portion 29 is locked in both the notches 52 and 52. When the parking cable is pulled during parking, the parking lever 20b swings in the clockwise direction in FIGS. 1, 5 and 6 around the proximal-side swinging shaft pin 37 to extend the toggle mechanism 22a. . The parking lever 20 is provided in a state where the return spring 30 is provided between an engaging portion 58 formed at an intermediate portion of the parking lever 20b and the bent portion 29, and the pulling operation to the parking cable is released. 20b returns to the non-operating state shown in FIG.
[0024]
The distal-side oscillating shaft pin 39 supports both ends at the distal-side support holes 43 and 43 provided at the distal ends of the both support plate portions 41 and 41 (base-end side link arms 38). Yes. A parking lever base end portion of the front end side link arm 40 is supported at a middle portion of the front end side swing shaft pin 39 between the support plate portions 41, 41 so as to be swingably displaceable. . For this purpose, a front end side link hole 55 is formed in a swinging piece 54 fixed to the parking lever base end portion of the front end side link arm 40. An intermediate portion of the tip-side oscillating shaft pin 39 is inserted into the tip-side link hole 55. Regarding the structure of the part that supports both end portions of the tip-side swing shaft pin 39 on the support plate portions 41 and 41 and the portion that supports the swing piece 54 on the intermediate portion of the tip-side swing shaft pin 39 Is the same as in the case of the base end side pivot shaft pin 37 and the both support plate portions 41 and 41 and the anchor member 27, and thus the same parts are denoted by the same reference numerals, and redundant description is omitted. To do.
[0025]
As described above, the swing piece 54 provided at the base end portion of the distal end side link arm 40 pivotally supported by the distal end portions of the both support plate portions 41 and 41 (base end side link arms 38). Forms a pair of stopper surfaces 56a, 56b. Both the stopper surfaces 56a and 56b are bent most when the distal end side link arm 40 and the both support plate portions 41 and 41 (base end side link arm 38) are not operated, and the entire length of the toggle mechanism 22a. In the shortest state, it contacts the inner peripheral edge of the substrate portion 28 of the anchor member 27. Then, the distal end side link arm 40 and the proximal end side link arm 38 are prevented from further bending. On the other hand, the distal end surface of the pressing rod portion 57 constituting the distal end side of the distal end side link arm 40 is a hemispherical convex surface. The front end surface is abutted against a rear end surface of a concave hole 59 formed in the base end surface of the adjusting screw 32 that constitutes the gap adjusting mechanism 10a so as to be swingable and displaceable.
[0026]
In the case of the disc brake with a parking mechanism of the present invention configured as described above, when a braking force is generated during parking, a parking cable (not shown) is pulled by an operation lever installed in the driver's seat, and the parking lever 20b is moved to FIG. 5 is swung clockwise. As a result, the pair of support plate portions 41 and 41 (base end side link arm 38) formed integrally with the parking lever 20b is centered on the base end side swing shaft pin 37, as shown in FIGS. Swings clockwise. Then, as shown by chain lines α and α in FIG. 5, the arrangement state of the support plate portions 41 and 41 (base end side link arms 38) and the front end side link arms 40 is more than the inoperative state of the parking mechanism. Close to a straight line. As a result, the distance L (FIG. 6) between the distal end surface of the distal end side link arm 40 and the proximal end side pivot shaft pin 37 increases, and the distal end of the distal end side link arm 40 passes the piston 6b and the gap. It is pressed toward the side surface of the rotor 1 through the adjusting mechanism 10a. As a result, the pair of pads 2a and 2b pressed respectively by the piston 6b and the claw portion 7a of the caliper 4b strongly hold the rotor 1 from both sides, and the braking force is generated.
[0027]
The toggle mechanism 22a constituted by the proximal end and distal end swinging shaft pins 37 and 39 and the proximal end and distal end link arms 38 and 40 does not generate a twisting force and rubs. There are few and efficiency is good. Further, since the parking lever 20b and the toggle mechanism 22a have a two-stage structure, the lever ratio is high, and the braking force can be stably generated without using a particularly long parking lever 20b. Thus, the stroke amount of the parking cable can be reduced. In this case, the lever ratio corresponds to a force that pushes the piston 6b with respect to the pulling force of the parking cable, and is expressed by lever ratio = parking lever ratio × toggle mechanism link ratio.
[0028]
Further, as a characteristic of the toggle mechanism 22a, when the stroke amount of the parking cable is small, the distal end side link arm 40 and the proximal end side link arm 38 are greatly bent, so that the link ratio is small. The displacement amount of the piston 6b can be increased in place of the small force F with which the distal end of the distal link arm 40 presses the piston 6b. This is because the amount of displacement of the piston 6b is increased with respect to the stroke amount of the parking cable at the initial stage of operation of the parking brake by pulling the parking cable, and the space between the rotor 1 and the lining 11 is increased. It means that the gap of can be filled quickly. In contrast, when the stroke amount of the parking cable is increased, the bending of the distal end side link arm 40 and the proximal end side link arm 38 is reduced and the state becomes close to a straight line, so that the link ratio is increased. Instead of reducing the displacement amount of the piston 6b, the force F at which the distal end portion of the distal end side link arm 40 presses the piston 6b is increased. This means that at the final stage of operation of the parking brake by pulling the parking cable, the force that presses the piston 6b against the pulling force of the parking cable can be increased.
[0029]
As described above, in the case of the disc brake with a parking mechanism of this example, the displacement amount of the piston 6b is increased at the initial stage of operation of the parking brake, and the force for pressing the piston 6b is increased at the final stage. In addition, it is possible to reduce the friction loss caused by the twisting and to reduce the friction loss caused when the parking brake is operated. Furthermore, the lever ratio is high because of the two-stage configuration of the parking lever 20b and the toggle mechanism. Therefore, as described above, even when the parking lever 20b is short, a large braking force can be stably generated, and the stroke of the parking cable can be shortened.
[0030]
7 to 10 show a second example of the embodiment of the present invention. The first example described above applies the present invention to a disc brake equipped with a caliper 4b (FIGS. 1 and 2) formed by casting a metal. In this example, a steel plate or the like is sufficient. The present invention is applied to a disc brake having a caliper (caliper plate) 4c formed by stamping and forming a metal plate having excellent strength and rigidity.
[0031]
Accordingly, in this example, the parking lever 20c and the base end side link arm 38a are supported on the caliper 4c by the base end side swing shaft pin 37a so as to be swingable. The anchor member 27 (FIGS. 1 to 3) provided in the first example is omitted. The parking lever 20c and the base end side link arm 38a are formed integrally with each other, and the base end side swing shaft pin 37a is provided at a continuous portion between the parking lever 20c and the base end side link arm 38a. ing. Further, in the case of the present example in accordance with the omission of the anchor member 27, a guide bracket 60 for guiding the parking cable is fixed to the caliper 4c with screws. The configuration and operation of the other parts are the same as those of the first example described above or the disc brake that has been widely known so far, and the description thereof will be omitted. In addition, regarding the part which concerns on this invention, the same code | symbol is attached | subjected to a part equivalent to the said 1st example.
[0032]
【The invention's effect】
Since the present invention is configured and operates as described above, it is possible to realize a structure that is small in size and stably generates a large braking force and requires a short parking stroke.
[Brief description of the drawings]
FIG. 1 is a diagram of a disc brake with a parking mechanism as viewed from the outside in the radial direction, showing a first example of an embodiment of the present invention in a partially cut state;
FIG. 2 is a view as seen from below in FIG.
3 is an enlarged cross-sectional view taken along the line AA in FIG.
FIG. 4 is an exploded perspective view showing a toggle mechanism and a parking lever portion taken out.
FIG. 5 is a diagram showing the state of the toggle mechanism portion as viewed from the same direction as in FIG. 1 in order to show the displacement state of each portion.
6 is a view showing a state in which the toggle mechanism is taken out and viewed from the same direction as in FIG.
FIG. 7 is a diagram showing a disc brake with a parking mechanism as viewed from the outside in the radial direction, showing a second example of the embodiment of the present invention in a state where a part thereof is cut.
FIG. 8 is a view as seen from below in FIG.
9 is a view from above of FIG. 8 with a part omitted.
10 is a diagram viewed from the right side of FIG. 8;
FIG. 11 is a view similar to FIG. 10, showing a first example of a conventional structure.
12 is a cross-sectional view taken along line BB in FIG.
13 is a cross-sectional view taken along the line CC of FIG.
FIG. 14 is a sectional view showing a second example of a conventional structure.
[Explanation of symbols]
1 rotor
2a, 2b pad
3, 3a support
4, 4a, 4b, 4c Caliper
5, 5a cylinder
6, 6a, 6b Piston
7, 7a Claw
8 Rod
9 Cylinder bottom
10, 10a Gap adjustment mechanism
11 Lining
12, 12a Anchor member
13 Cam mechanism
14 round hole
15 Cam member
16 Rotating shaft
17 Cam plate
18 balls
19a, 19b Cam groove
20, 20a, 20b, 20c Parking lever
21 Parking cable
22, 22a Toggle mechanism
23a, 23b Link arm
24 guide pins
25 Guide section
27 Anchor member
28 Board part
29 Folding part
30 Return spring
31 volts
32 Adjusting screw
33 Adjustment nut
34 Compression coil spring
35 Thrust ball bearing
36 plugs
37, 37a Proximal pivot shaft pin
38, 38a Proximal link arm
39 Tip side pivot pin
40 Tip side link arm
41 Support plate
42 Proximal support hole
43 Tip side support hole
44 Buttocks
45 Locking groove
46 Anchor hole
47 Retaining ring
48 Seal ring
49 Cover
50 seal
51a, 51b Locking plate part
52 Notch
53 Guide hole
54 Swing piece
55 Tip side link hole
56a, 56b Stopper surface
57 Pressing rod
58 Locking part
59 concave hole
60 Guide bracket

Claims (4)

A pair of pads arranged on both sides of a rotor that rotates together with the wheels, a caliper that presses these pads against both side surfaces in the axial direction of the rotor as a piston fitted in a cylinder provided therein, and the cylinder A toggle mechanism that is provided farther from the rotor than the rotor and presses the piston toward the rotor as it extends, and a parking lever that has a force point at the tip that expands and contracts as the rocker swings. In the disc brake with a parking mechanism, the toggle mechanism is a part of the caliper or a member fixed to the caliper, and is provided at the center of the parking lever provided at a portion facing the bottom of the piston. The base end side swing shaft pin that is the fulcrum of the toggle mechanism and the base end side swing shaft pin together with the parking lever A proximal link arm that is movably coupled, a distal swing shaft pin that is a connecting point provided at the distal end of the proximal link arm, and the proximal swing shaft pin to the distal swing shaft pin. The parking arm characterized in that it is coupled to the link arm so as to be swingable and displaceable, and has a front end side link arm abutted as an action point on a portion where the front end portion moves in the axial direction together with the piston. Disc brake with mechanism. 2. The disc brake with a parking mechanism according to claim 1, wherein the parking lever has an integral structure with the base end side link arm. A tip end portion of the tip side link arm is provided attached to the piston, and a gap adjusting mechanism for adjusting a gap between both side surfaces of the rotor and the linings of both pads when the parking mechanism is in an inoperative state. The disc brake with a parking mechanism according to claim 1, which is abutted against a component member. The connecting portion in the base end side swing shaft pin and the rotational displacement contact portion of the joint portion in the distal end side swing shaft pin are covered with a seal member. A disc brake with a parking mechanism as described above.

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