GB2458789A - Pin slide disc brake with a wear indicator restricting the caliper movement - Google Patents

Pin slide disc brake with a wear indicator restricting the caliper movement Download PDF

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Publication number
GB2458789A
GB2458789A GB0905400A GB0905400A GB2458789A GB 2458789 A GB2458789 A GB 2458789A GB 0905400 A GB0905400 A GB 0905400A GB 0905400 A GB0905400 A GB 0905400A GB 2458789 A GB2458789 A GB 2458789A
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United Kingdom
Prior art keywords
caliper
wear indicator
carrier
pin
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0905400A
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GB0905400D0 (en
GB2458789B (en
Inventor
Kazuyuki Matsuishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nisshinbo Holdings Inc
Original Assignee
Nisshinbo Industries Inc
Nisshin Spinning Co Ltd
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Filing date
Publication date
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Publication of GB0905400D0 publication Critical patent/GB0905400D0/en
Publication of GB2458789A publication Critical patent/GB2458789A/en
Application granted granted Critical
Publication of GB2458789B publication Critical patent/GB2458789B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • F16D55/2265—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing
    • F16D55/22655—Constructional details of guide pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • F16D55/2265—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing
    • F16D55/227—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes the axial movement being guided by one or more pins engaging bores in the brake support or the brake housing by two or more pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear

Abstract

To provide a disc brake device which restricts the excessive movement of the caliper by a simple means so as to prevent the pin boot from being damaged. In the pin slide type disc brake device with the brake pad wear indicator 100, when the housing 31 of the caliper 30 moves in the direction to approach the carrier 20, the brake pad wear indicator 100 restricts the excessive movement of the caliper 30 relative to the carrier 20.

Description

PIN SLIDE TYPE DISC BRAKE DEVICE
FIELD OF INVENTON
[0001] This invention relates to a pin slide type disc brake device especially suitable for heavy duty vehicles, such as a buses or trucks, and more precisely to a pin slide type disc brake device that can prevent pin boot damage.
BACKGROUND OF THE INVENTION
[0002] A typically known pin slide type disc brake device is disclosed, for example, in Patent Document 1.
Around a pin slide mechanism of a caliper and a carrier, which are components of the pin slide type disc brake device, a boot covering the caliper and a guide pin is arranged so as to prevent foreign objects from getting into the pin slide mechanism, thereby securing a smooth sliding caliper motion relative to the carrier.
[0003] When carrying the pin slide type disc brake device alone, or when disassembling or assembling the pin slide type disc brake device, the caliper freely moves relative to the carrier.
Particularly, when the entire pin slide type disc brake device is inclinedly placed, without applying an external force, the caliper moves relative to the carrier due to the caliper's own weight.
[0004] When a housing of the caliper, without restriction, allows to move in a direction of approaching the carrier, the carrier or the guide pin that is fixed to the carrier collides with an opening of a guide bore of the caliper, thereby possibly jamming the boot therein to cause damage and deforming a boot retainer end.
[0005] Especially, visually checking boot damage Is difficult when it Is a small crack, and furthermore the boot retainer end is covered by the boot so that visually checking the boot retainer end deformation is extremely difficult.
[0006] When the boot is damaged, water leaks from the damaged portion into the boot, which may rust the guide pin and increase sliding resistance as the foreign object enters therein. Also, when the boot retainer end deforms, the guide pin slides to contact, thereby increasing the sliding resistance and jeopardizing the smooth caliper slidabifity relative to the carrier.
[0007] Due to these factors, the smooth slidability of the pin slide mechanism may be jeopardized, which for example can result in the brake dragging when the caliper does not return upon releasing the brake and excessive wearing of an outer pad when compared to an inner pad. These phenomena cause serious adverse effects on brake performance of the disc brake device.
[0008] There are vehicles in the market that use a pin slide type disc brake device, which has a means to restrict the excessive caliper movement relative to the carrier.
in this disc brake device, a protrusion with a stopper function is integrally formed in the caliper, and before the carrier or the guide pin fixed to the carrier collides with the opening of the guide bore of the caliper, the protrusion is abutted against the carrier to restrict the excessive caliper movement relative to the carrier.
[00091 [Patent Document 1] Japanese Provisional Patent Publication No. 2007-17004 [0010] A conventional pin slide type disc brake device having a structure, which restricts the excessive caliper movement relative to the carrier, is often technically difficult to use in heavy duty vehicles.
This is because the disc brake device for the heavy duty vehicle is such that the brake pad needs to be larger but the layout of the carrier is restricted so that an extra portion to abut against the protrusion formed on the caliper cannot be designed.
[0011] The present invention was made in consideration of the above-identified problems, and an object thereof is to provide a pin slide type disc bake device that can prevent boot damage by restricting the excessive movement of the caliper relative to the carrier using a brake pad wear indicator conventionally equipped in the disc brake device.
Another object of the present invention is to provide a pin slide type disc brake device that can prevent the deformation of the boot retainer as well as pin boot damage.
SUMMARY OF THE INVENTION
[0012] In order to attain the objects described above, the pin slide type disc brake device of the present invention Is characterized to have a pair of brake pads; a carrier which supports at least one of the brake pads; a caliper including a housing for storing a brake actuator that operates for one of the brake pads to engage with a brake disc and a bridge extending from the housing so as to stride over the brake disc and having a reaction portion that acts on the other brake pad at an opposite side of the housing; a pin slide mechanism, which slidably supports the caliper relative to the carrier, including a guide pin fixed to either one of the carrier or the caliper and a pin boot closing a guide bore arranged at the other of the carrier or the caliper; and a brake pad wear indicator, which is slidably inserted in the caliper and allows to visually check abrasion loss of the other brake pad, in which brake pad wear indicator restricts an excessive movement of the caliper toward the carrier when the caliper moves in a direction for the housing of the caliper to approach the carrier, [0013] According to the present invention, the brake pad wear indicator has a stopper function to restrict the excessive movement of the caliper relative to the carrier, thereby restricting the excessive movement of the caliper relative to the carrier when carrying the pin slide type disc brake device, or when disassembling or assembling the pin slide type disc brake device, thereby preventing pin boot damage and boot retainer deformation.
[0014] Furthermore, the pin slide type disc brake device of the present invention is characterized that the brake pad wear indicator includes a pin-like wear indicator body slidably inserted in a caliper sliding hole and restricts, as a part of the wear indicator body abutting against the caliper, the excessive movement of the caliper toward the carrier.
[0015] Still further, the pin slide type disc brake device of the present invention is characterized that the brake pad wear indicator has a pin-like wear indicator body slidably inserted in a caliper sliding hole and a spring that is fitting over an exterior of the wear indicator body and is compressed between the wear indicator body and the caliper for the wear indicator body to resiliently contact the carrier, the spring restricting the excessive movement of the caliper toward the carrier.
[0016] Still further, the pin slide type disc brake device of the present invention is characterized that the excessive movement of the caliper toward the carrier is restricted when the spring reaches a compressed limit.
[0017] Still further, the pin slide type of the present invention is characterized in that the spring is a coil spring or a volute spring.
[0018] Still further, the pin slide type of the present invention is characterized that the brake pad wear indicator has a pin-like wear indicator body slidabiy inserted in a caliper sliding hole and a collar that is fitting over an exterior of the wear indicator body, the collar restricting an excessive movement of the caliper toward the carrier.
[0019] Still further, the pin slide type of the present invention is characterized that the brake pad wear indicator includes a spring arranged to make the wear indicator body resiliently contacting the carrier either inside or outside the collar.
[0020] Yet, further, the pin slide type of the present invention is characterized that a boot retainer is fixed to the caliper, and a pin boot is mounted to the boot retainer.
[0021] The present invention can provide the following advantages.
<1> The first advantage is to surely restrict the excessive movement of the caliper because the brake pad wear indicator has an additional stopper function to restrict the excessive movement of the caliper relative to the carrier without physically adding an extra part.
Accordingly, pIn boot damage generally caused during inadvertent movement of the caliper can be prevented and the smooth slidability of the pin slide mechanism of the pin slide type disc brake device is assured.
<2> The second advantage is to restrict the excessive movement of the caliper relative to the carrier simply by a slight modification to the brake pad wear indicator specification, so that the present invention can be equipped in the pin slide type disc brake device with the brake pad wear indicator that is already in the market, thereby being able to utilize existing parts.
<3> In one embodiment of the present invention, the above-described brake pad wear indicator may Include a pin-like wear indicator body that slidably penetrates a caliper sliding hole, and the excessive movement of the caliper is restricted by abutting a part of the wear indicator body against the caliper. According to this configuration, a simple method of slight modification to the wear indicator body as a component of the brake pad wear indicator can restrict the excessive movement of the caliper relative to the carrier.
<4> In a further embodiment of the present invention, the above-described brake pad wear indicator may include the pin-like wear indicator body that slidably penetrates the caliper sliding hole and a spring fitting externally on the wear indicator body and compressing between the wear indicator body and the caliper so that the wear indicator body resiliently contacts the carrier, thereby restricting the excessive movement of the caliper relative to the carrier with this spring.
According to this configuration, by the simple method of slight modification of the spring as a component of the brake pad wear indicator, the excessive movement of the carrier relative to the carrier can be restricted.
<5> In still a further embodiment of the present invention, the excessive movement of the caliper may be restricted when spring compression spring reaches its limit. According to this configuration, the excessive movement of the caliper relative to the carrier can surely be restricted with the slight modification of the spring as a component of the brake pad wear indicator.
<6> In still a further embodiment of the present invention, the spring may be a coil spring. According to this configuration, an inexpensive method of using the coil spring, whose manufacturing process is relatively easy, allows to restrict the excessive movement of the caliper relative to the carrier.
<7> In still a further embodiment of the present invention, the spring may be a volume spring. According to this configuration, an accurate method of using the volume spring that has stable positioning allows to restrict the excessive movement of the caliper relative to the carrier.
<8> In still a further embodiment of the present invention, the brake pad wear indicator may be comprised of a pin-like wear indicator body which slidably penetrates the caliper sliding hole and a collar fitting externally on the wear indicator body in order to restrict the excessive movement of the caliper by the collar. According to this configuration, conventional wear indicator body and spring are effectively utilized, and by adding the collar only can surely restrict the excessive movement of the caliper relative to the carrier.
<9> In still a further embodiment of the present invention, the wear indicator may include a spring arranged to make the wear indicator body resiliently contacting the carrier either inside or outside the collar. According to this configuration, the conventional wear indicator body and the spring can effectively be utilized, and at the same time the collar stabilizes the spring positioning, thereby accurately restricting the excessive movement of the caliper relative to the carrier.
<10> In yet a further embodiment of the present invention, the boot retainer may be fixed to the caliper, and the pin boot is mounted to the boot retainer.
According to this configuration it Is possible to prevent boot retainer deformation when accidentally moving the caliper.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022J The above and other objects of the present invention will become readily apparent by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein: [0023] FIG. 1 is a plan view of an example of the pin slide type disc brake device equipped with the brake pad wear indicator relating to the first embodiment; [0024] FIG. 2 is a front view of FIG. 1; [0025] FIG. 3 is a cross section view taken along the line Ill-Ill; [0026] FIG. 4 is a cross section of the pin slide mechanical of the carrier and the caliper and is a partially enlarged cross section view of the pin slide mechanism without excessive movement of the caliper; [0027] FIG. 5 is a cross section view of the pin slide mechanical of the carrier and the caliper and is a partially enlarged cross section view of the pin slide mechanism while restricting the excessive movement of the caliper; [0028] FIG. 6 is a perspective view of the brake pad wear indicator; [0029] FIG. 7 is an enlarged cross section of the brake pad wear indicator and the surrounding thereof without the excessive movement of the caliper; [0030] FIG. 8 is an enlarged cross section of the brake pad wear indicator and the surrounding thereof while restricting the excessive movement of the caliper; [0031] FIG. 9 is a view relating to the second embodiment employing another type of brake pad wear indicator that uses the spring to restrict the excessive movement of the caliper and is an enlarged cross section view of the brake pad wear indicator and the surrounding thereof without the excessive movement of the caliper; [0032] FIG. 10 is a cross section view of the pin slide mechanism relating to the second embodiment and is an enlarged cross section view of the brake pad wear indicator and the surrounding thereof while restricting the excessive movement of the caliper; [0033] FIG. ills a view relatIng an application example of the second embodiment and is an enlarged cross section view of the brake pad wear indicator and the surrounding thereof without the excessive movement of the caliper; and [0034] FIG. 12 a view relating to the third embodiment employing another type of brake pad wear indicator that uses the collar to restrict the excessive movement of the caliper and is an enlarged cross section view of the brake pad wear indicator and the surrounding thereof without the excessive movement of the caliper.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) [0035] The pin slide type disc brake device of the present invention will be explained next.
[First Embodiment] [0036] A first embodiment of the present invention will be explained with reference to the drawings.
FIG. 1 is a plan view of an example of the pin slide type disc brake device equipped with the Drake pad wear indicator; FIG. 2 is a front view of FIG. 1; FIG. 3 is a cross section view of FIG. 2; FIGS. 4 and 5 are enlarged cross section views of the pin slide mechanisms of the carrier and the caliper; and FIGS. 7 and 8 are enlarged views of the brake pad wear indicator and its surrounding.
[0037] A pin slide type disc brake device according to the present Invention has a brake pad wear indicator which has a function to restrict the excessive movement of a caliper relative to a carrIer.
[0038] The pin slide type disc brake device will be explained first.
According to FIGS. 1 -3, the pin slide type disc brake device mainly includes a carrier 20 fixed on a stationary portion of a vehicle as crossing over a periphery of a rotor 10, a caliper 30 provided as crossing over the periphery of the rotor 10, a pair of pin slide mechanisms 60 and 70 guiding the caliper 30 in a parallel direction to an axle of the rotor 10, and inner and outer pad 40 and 50 frictionally engagable with each side surface of the rotor 10.
[0039] The caliper 30 is made up of: a bolt 36 that affixes a housing 31, where the housing stores a brake actuator 32 to press the inner pad 40; and a bridge 35 extending from the housing 31 while crossing over the rotor 10, and the bridge 35, where the bridge has a finger portion 35a operating on an outer pad 50 at an opposite side of the housing 31.
[0040] The brake actuator 32 can operate to apply the brake force through a conventional tappet assembly, the detail of which is not shown in the figures. As the brake actuator 32, the conventional tappet assembly disclosed in the Japanese Provisional Patent Publication No. 2007-17004, can be employed; however, a hydraulic actuator, which uses fluid pressure to operate the piston within a cylinder, can be employed instead of the tappet assembly.
[0041] The brake actuator 32 is equipped with an automatic clearance adjustment mechanism, which compensates for wear loss of a friction material when the wear loss reaches a predetermined amount.
[0042] When the brake actuator 32 operates to press the inner pad 40 against one surface of the rotor 10, the pressure reaction force moves the caliper 30, (which is supported by the respective pin slide mechanisms 60, 70), backward, as shown at the left side of FIG. 3, and the finger portion 35a of the caliper 30 presses the outer pad 50 against the other surface of the rotor 10.
[0043] The floating-type pin slide type disc brake device is well-known, and therefore the detail explanation is omitted here.
[0044] The pin slide mechanisms 60, 70 have the same structures and configurations, and therefore the pin slide mechanism 60, which is shown at the right side in FIG. 1, only is explained and the explanation of the left side pin slide mechanism 70, which is a side of an arm 34 of the caliper 30, is omitted here.
[0045] The pin slide mechanism 60 Includes a guide pin 80, whIch has a cylindrical guide sleeve 81 slidably inserted in an arm 33 of the caliper 30 via a bush 37 and an Installation bolt 82 penetrates through the guide sleeve 81 and Is mounted on the carrier 20.
[0046] As shown in the enlarged view of FIG. 4, the guide sleeve 81 slidably penetrates a guide bore 37a formed at a center side of the bush 37.
An exposed portion of the guide sleeve 81 is structured to be covered by a pin boot 90.
A body 91 a of a metallic boot retainer 91 is press-fitted at an entrance side of a guide bore 33a of the arm 33.
One end 90a of the pin boot 90 is mounted on an engagement groove 81b formed on a periphery of a large diameter flange 81a of the guide sleeve 81 positioned at a fixing end side of the guide pin 80, and the other end 90b is mounted on the boot retainer 91 around a flange 91 b of the boot retainer 91.
[0047] The present invention relates to a brake pad wear indicator 100 having the function of Indicating the wear loss of the friction material of the brake pad, at least to prevent damage to the pin boot 90, which has a stopper function to restrict the excessive movement of the caliper 30 relative to the carrier 20 within a predetermined range.
[0048] The present invention may be different types such as where the boot retainer 91 is integrated with the caliper 30 for example through a cutting process, or where the other end of the pin boot 90 engages in a groove formed in the caliper 30; or where a metal ring is molded in the other end of the pin boot 90 to be pressed in a caliper hole. Alternatively, the pin boot 90 can cover an exposed portion of the guide pin 80, and many other types may be applied.
[0049] The brake pad wear indicator 100, shown as an example in FIG. 6, is comprised of a pin like wear indicator body 110 and a coil spring functioning as a spring 120 fitting around the periphery of the wear indicator 110.
[0050] The wear indicator 110 is formed by using a material, such as plastic, to continuously integrate a rod 11 Oa indicating a scale, a stopper axle 11 Ob, and a seating hOc.
[0051] The rod 1 ba of the wear indicator body 110 slidably penetrates a rod guide bore 31a formed in the housing 31, and the spring 120 freely fits over the exterior of the wear indicator body 110 to be compressed between the seating 11 Oc and the housing 31. The spring force of the spring 120 constantly abuts the end surface of the seating 11 Oc against the carrier 20.
[0052] When the friction material of the outer pad 50 wears out, the projection amount of the rod 11 Oa with the scale thereon of the wear Indicator body 110 decreases. The wear loss of the outer pad 50 can be checked by view observation of the scale of the rod 1 lOa projecting from the rod guide bore 31a.
[0053) Dimensions of the wear indicator body 110 are such that the rod 11 Oa has a cross section to be inserted in the rod guide bore 31 a, and the length allows the scale to extend out of the housing 31.
On the other hand, the stopper axle 11Db has a cross section that is not insertable in the rod guide bore 31 a, and the end at the rod 11 Oa side of the stopper axle 11 Ob is designed to abut agaInst the housing 31 around the rod guide bore 31 a.
[0054] The housing 31 abuts against the stopper axle 110, thereby restricting excessive movement of the housing 31 of the caliper 30 in a direction approaching the carrier 20.
[0055] Furthermore, the stopper axle 1 lOb has a cross section to have the spring 120 freely fitting over the exterior thereof.
[0056] The seating 11 Oc has a cross section that the spring 120 is not fittable over the exterior thereof but the spring 120 can seat thereon.
[0057] Also, the restricted positioning for the excessive movement of the caliper 30 relative to the carrier 20 is determined based on the length of the stopper axle 1 lOb and the seating 1 lOc, and therefore the length thereof is designed such that the pin boot 90 of the pin slide mechanism is not jammed between the boot retainer 91 and a large diameter flange 81 a of the guide sleeve 81, and that the large diameter flange 81 a does not collide with the flange 91 b of the boot retainer 91.
[0058] A shape of the outer indicator 110 in combination of the rod hlOa, the stopper axle 11 Ob, and the seating 11 Oc, is not limited to the shape in the figures and can be any configuration as long as the wear indicator 110 has the stopper function for the caliper 30.
[0059] Next, the operation of the brake pad wear indicator 100 will be explained.
[0060] When carrying the pin slide type disc brake device alone, or disassembling or assembling the pin slide type disc brake device, the caliper 30 freely slides relative to the carrier 20 via the pin slide mechanisms 60, 70.
(0061] FIG. 4 shows an enlarged cross section view of the pin slide mechanism 60 under the condition where the caliper 30 does not over-movement relative to the carrier 20, and FIG. 7 shows an enlarged cross section view of the brake pad wear IndIcator 100.
[0062] The pin slide mechanism under this condition is such that the flange 91 b of the boot retainer 91 positioned at the entrance side of the guide bore 33a formed in the arm 33 of the caliper 30 is apart from the large diameter flange 81a of the fixing end side of the guide sleeve 81.
Therefore, the pin boot 90 and the boot retainer 91 are free from damage by the large diameter flange 81 a of the guide sleeve 81.
[0063] The brake pad wear indicator 100 under normal conditions has a bottom surface constantly abutting against the carrier 20 caused by the spring force of the spring 120 being compressed between the seating hOc and the housing 31.
The end of the rod 11 Oa side of the stopper axle 11 Ob is apart from the housing 31 and has a clearance "G" between the end of the stopper axle 11 Ob and the housing 31.
[00641 In FIG. 7, the housing 31 of the caliper 30 moves to approach the carrier 20, while the spring 120 is being compressed between the seating 11 Oc and the housing 31, the housing 31 approaches the stopper axle 11 Ob. As the housing 31 approaches the carrier 20, the clearance G between the end of the stopper axle 1 lOb and the housing 31 becomes narrower.
[0065] Because the stopper axle 11 Ob has a cross section that cannot be inserted into the rod guide bore 31 a, the housing 31 collides against the end of the stopper axle 1 lOb, and the movement of the caliper 30 relative to the carrier 20 is restricted.
[0066] FIG. 5 shows an enlarged cross section of the pin slide mechanism 60 I0 when the brake pad wear indicator 100 restricts the excessive movement of the caliper 30, and FIG. 8 shows the enlarged cross section view of the brake pad wear indicator 100.
Although the caliper 30 moves, the flange 91 b of the boot retainer 91 approaches the large diameter flange 81a of the fixing end of the guide sleeve 81, the excessive movement of the caliper 30 can be restricted because of the stopper function of the brake pad wear indicator 100 prior to the collision.
[0067] Therefore, the pin boot 90 is not damaged, and the boot retainer 91 is not deformed.
[0068] After mounting the pin slide type disc brake device on a vehicle, the brake pad wear indicator 100 can indicate actual wear loss of the friction material.
[00691 The wear loss of the outer pad 50 can be read by the view observation of the scale on the rod 11 Oa of the wear indicator body 110 projecting from the rod guide bore 31a.
[0070] As explained above, the first embodiment is an example of the brake pad wear indicator 100 with a combination of the indicator function for the wear loss of the friction material and the stopper function for the caliper 30.
[0071] In other words, a pin boot 90 breakage prevention function and a boot retainer 91 deformation prevention function are added to the brake pad wear indicator 100 with the wear loss indicating function.
According to this configuration, it does not require a special forming of the carrier or the caliper 30 or the additional new stopper in order to restrict the excessive movement of the caliper 30.
Positioning of the brake pad wear indicator 100 is not affected by the size of the brake pads 40, 50, and therefore the brake pad wear Indicator 100 can be applied to a heavy duty vehicle employing the pin slide type disc brake device with large size brake pads having large surface areas.
[0072] Other embodiments will be explained next but the same members in the above-first embodiment bear the same reference numbers and the detailed
description will be omitted.
(Second Embodiment] [0073] The above-first embodiment illustrates the brake pad wear indicator body 100 where one part of the wear indicator 110 abuts against the caliper 30 to restrict the excessive movement of the caliper 30; however, as shown in FIGS. 9- 11, the brake pad wear indicators 1 OOA, 1008 may be restricting the excessive movement of the calIper 30 relative to the carrier 20 by the springs 1 20A, 1 20B fitting over the exterior of the wear indicator body 110.
[0074] The brake pad wear indicator 100A shown in FIGS. 9, 10 has the spring 1 20A which is a coil spring, and the spring 1 20A being compressed between the seating 11 Oc of the wear indicator body 110 and the housing 31.
[0075] This example illustrates that a half of the coil spring 1 20A at the seating 11 Oc side is a solid spring which is non-compressible, and the opposite half of the coil spring 1 20A is non-solid spring which is compressible.
[0076] FIG. 9 shows the brake pad wear indicator 1 OOA where there is no excessive movement of the caliper 30 relative to the carrIer 20, and FIG. 10 shows the brake pad wear indicator 1 OOA while restricting the excessive movement of the caliper 30.
[0077] The spring force of the spring 1 20A fitting over the exterior of the wear indicator body 110 constantly abuts the end surface of the seating 11 Oc of the wear indicator 110 against the carrier 20 as shown in FIG. 9.
[0078] When the caliper 30 shows excessive movement, the spring 1 20A is compressed to gradually shortening the clearance of the coil portion of spring, and the compression of the spring 1 20A reaches the maximum uncompressible, thereafter restricting the excessive movement of the caliper 30.
(0079] The length of the spring 120A, when reaching the maximum compression state of the spring 1 20A, is set to adjust according to the restricted position of the excessive movement of the caliper 30 relative to the carrier 20.
[0080] FIG. 11 shows the brake pad wear indicator 1 OOB which is structured by a volute spring 1206 fitted over the exterior of the wear indicator body 110.
The volute spring may be a known compression spring processed to make a conical shape making a long side of the plate spring, which is rectangular in cross section, parallel to a coil center line.
The volute spring 1 20B is compressed between a back surface of the housing 31 and the seating 11 Oc of the wear indicator body 110.
[0081] FIG. 11 shows the brake pad wear indicator 1 OOB while there is no excessive movement of the caliper 30 relative to the carrier 20.
[0082] As the caliper shows excessive movement the compression of the spring 1 20B starts, and the compression of the spring 1 20B reaches the maximum compression to become uncompressible.
The excessive movement of the caliper 30 is restricted by reaching the maximum compression of the spring 1 20B.
[0083] These examples have an advantage of reducing the manufacturing cost of the wear indicator body 110 by restricting the excessive movement of the caliper 30 relative to the carrier 20 simply by replacing the springs 1 20A, 1 20B.
[Third Embodiment] [0084] FIG. 12 shows the brake pad wear indicator 1 OOC relating to the third embodiment which is structured with the wear indicator 110, the collar 130 fitting over the exterior of the wear indicator body 110, and a coil spring fitting inside or fitting over the outside of the collar 130.
[0085] In this example, the spring force of the spring being compressed between the housing 31 and the end surface of the seating 11 Oc constantly abuts the seating 11 Oc of the wear indicator body 110 agaInst the carrier 20.
[0086] FIG. 12 shows the brake pad wear indicator 1 OOC without the excessive movement of the caliper 30, where there is the clearance G between the housing 31 and the left end of the collar 130.
[0087] In the third embodiment, as the caliper 30 makes excessive movement, the clearance G gradually changes to become smaller, and then the collar 130 is caught between the seating 11 Oc and the housing 31, thereby restricting the excessive movement of the caliper 30.
[0088] While the embodiments of the present invention disclosed herein are presently considered to be preferred embodiments, various changes and modifications can be made without departing from the spirit and scope of the present invention. The scope of the invention is indicated in the appended claims, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.
[Explanation of Reference Number] [0089] 10 Rotor, 20 Carrier, 30 Caliper, 31 Housing of the calIper, 31 a Rod guide bore of the hosing, 32 Brake actuator of the caliper, 33, 34 Arm of the caliper, 33a Guide bore of the arm, 35 Bridge of the caliper, 35a Finger portion of the bridge, 36 Bolt, 37 Bush, 37a Guide bore of the bush, 60, 70 Pin slide mechanism, 40 Inner pad, 50 Outer pad, 80 Guide pin, 81 Guide sleeve, 81a Large diameter flange of the guide sleeve, 81b Engagement groove of the guide sleeve, 82 Installation bolt, 90 Pin boot, 90a One end of the pin boot, 90b The other end of the pin boot, 91 Boot retainer, 91 a Body of the boot retainer, 92b Flange of the boot retainer, 100, 1 OOA, 1 OOB, 1 OOC Brake pad wear indicator, 110 Wear indicator body, 11 Oa Rod of the wear indicator body, 11 Ob Stopper axle of the wear indicator body, 11 Oc Seating of the wear indicator body, 120, 120A, 120B Spring, 130 Collar
GB0905400A 2008-03-31 2009-03-30 Pin slide type disc brake device Expired - Fee Related GB2458789B (en)

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JP2008089916A JP2009243564A (en) 2008-03-31 2008-03-31 Pin slide type disc brake device

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2013143992A1 (en) * 2012-03-26 2013-10-03 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Floating-caliper disk brake of a motor vehicle
US9416829B2 (en) 2011-06-09 2016-08-16 Beijingwest Industries Co. Ltd. Pivot pad brake caliper
EP3121477A1 (en) * 2015-07-21 2017-01-25 Meritor Heavy Vehicle Braking Systems (UK) Limited A disc brake assembly
WO2020007672A1 (en) * 2018-07-05 2020-01-09 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Disk brake and method for monitoring the condition of a disk brake

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JP5847561B2 (en) * 2011-11-29 2016-01-27 日立オートモティブシステムズ株式会社 Disc brake

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US6460659B1 (en) * 2000-12-07 2002-10-08 Caterpillar Inc Brake wear indicator

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US6460659B1 (en) * 2000-12-07 2002-10-08 Caterpillar Inc Brake wear indicator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9416829B2 (en) 2011-06-09 2016-08-16 Beijingwest Industries Co. Ltd. Pivot pad brake caliper
WO2013143992A1 (en) * 2012-03-26 2013-10-03 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Floating-caliper disk brake of a motor vehicle
EP2831447B1 (en) 2012-03-26 2017-11-01 KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH Floating-caliper disk brake of a motor vehicle
EP3121477A1 (en) * 2015-07-21 2017-01-25 Meritor Heavy Vehicle Braking Systems (UK) Limited A disc brake assembly
US9915310B2 (en) 2015-07-21 2018-03-13 Meritor Heavy Vehicle Braking Systems (Uk) Limited Disc brake assembly
WO2020007672A1 (en) * 2018-07-05 2020-01-09 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Disk brake and method for monitoring the condition of a disk brake

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GB2458789B (en) 2012-05-02
JP2009243564A (en) 2009-10-22

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